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TableofContents
LearningiOSSecurity
Credits
AbouttheAuthors
AbouttheReviewers
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Supportfiles,eBooks,discountoffers,andmore
Whysubscribe?
FreeaccessforPacktaccountholders
Preface
Whatthisbookcovers
Whatyouneedforthisbook
Whothisbookisfor
Conventions
Readerfeedback
Customersupport
Errata
Piracy
Questions
1.iOSSecurityOverview
Pairing
Backingupyourdevice
iCloudbackups
TakingbackupsusingiTunes
ViewingiOSdatainiTunes
Initialsecuritychecklist
Configuringapasscode
Configuringprivacysettings
Safariandbuilt-inAppprotections
Predictivesearchandspotlight
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Summary
2.IntroducingAppSecurity
Installingapps
BlockingaccesstotheAppStore
SingleAppmode,AppLock,andGuidedAccess
Appcommunication
HandoffandContinuity
Keybagsandkeychains
Keyboardsandextensions
Securingwhatextensionscanaccess
Usercontext
SandboxingandAppdatastorage
Introductiontoin-houseAppdevelopment
Summary
3.EncryptingDevices
SecurebootandactivatingiOS
PassbookandTouchIDforApplePay
IntroductiontoiOSnetworkcommunication
AirDrop
Abugorafeature?
VPN(Always-On,APN,Per-App,On-Demand)
GlobalHTTPProxy,caching,andthewebcontentfilter
Privacy-relatedconcerns
Lesser-knownwaysforAppletogatherdiagnostics
Healthapp
Configurationprofiles
Signing,encryption,anddelivery
Summary
4.OrganizationalControls
AppleConfigurator
Intendedworkflows
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Theinteractionmodes–Prepare,Supervise,andAssign
Theimportanceofsupervision
Apps,VPP,andAppleConfigurator
Massrestoringandnamingofdevices
Backupconcerns
Configuratoraschaperone
ActivationLockandFindMyiPhone
Addressingtheroughspots
DEPversusAppleConfigurator
GuidedAccessversusAppLockversusSingleAppMode
ActiveSync
Summary
5.MobileDeviceManagement
IntroducingMDM
ConfiguratorversusMDM
TheProfileManager
PreparingtheProfileManagerServer
PreparingProfileManager
CompletingPostConfigurationtasks
UsingProfileManager
EnrollingintoProfileManager
Devicemanagement
Passcodepolicies
IntroducingBushel
Setup
Theenrollmentprocess
Restrictions
VolumePurchasingProgramandMDM
Summary
6.DebuggingandConclusion
Xcode
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Divedeeperwithlibimobiledevice
InstallinglibimobiledeviceusingHomebrew
Usingidevicesyslogandidevicepair
Usingidevicedateandideviceinstaller
Appcommunications
Identifyingdevices
Listeningtonetworkcommunications
AppleIDsandApps
Forensics
Applicationsecurity
ViewinganApp
Summary
Index
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LearningiOSSecurityCopyright©2015PacktPublishing
Allrightsreserved.Nopartofthisbookmaybereproduced,storedinaretrievalsystem,ortransmittedinanyformorbyanymeans,withoutthepriorwrittenpermissionofthepublisher,exceptinthecaseofbriefquotationsembeddedincriticalarticlesorreviews.
Everyefforthasbeenmadeinthepreparationofthisbooktoensuretheaccuracyoftheinformationpresented.However,theinformationcontainedinthisbookissoldwithoutwarranty,eitherexpressorimplied.Neithertheauthors,norPacktPublishing,anditsdealersanddistributorswillbeheldliableforanydamagescausedorallegedtobecauseddirectlyorindirectlybythisbook.
PacktPublishinghasendeavoredtoprovidetrademarkinformationaboutallofthecompaniesandproductsmentionedinthisbookbytheappropriateuseofcapitals.However,PacktPublishingcannotguaranteetheaccuracyofthisinformation.
Firstpublished:February2015
Productionreference:2240215
PublishedbyPacktPublishingLtd.
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BirminghamB32PB,UK.
ISBN978-1-78355-174-3
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CreditsAuthors
AllisterBanks
CharlesS.Edge
Reviewers
JeremyAgostino
WilliamSmith
CommissioningEditor
AshwinNair
AcquisitionEditor
HemalDesai
ContentDevelopmentEditor
MamataWalkar
TechnicalEditor
MenzaMathew
CopyEditors
JasmineNadar
WishvaShah
ProjectCoordinator
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Proofreaders
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Indexer
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ProductionCoordinator
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CoverWork
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AbouttheAuthorsAllisterBanksisanenthusiast.He’sveryexcitedtobeintheexceedinglylimited,exclusiveclubofcoauthorsofCharlesS.Edge.AfterworkingforadecadewithITconsultingcompaniesonboththecoastsoftheU.S.,henowworksforamedical-focusedinstitutionwitheducationanddatacenteraspects.HehasgivenspeechesatLOPSA-East,MacTechConference,andMacAdminsConferenceatPennState.HelivesinNewYork.HecontributestovariousopensourceprojectsandspeaksenoughJapanesetoorderfood.
CharlesS.EdgehasbeenworkingwithAppleproductssincehewasachild.Professionally,CharlesstartedwiththeMacOSandAppleserverofferingsin1999afterworkingofyearswithvariousflavorsofUnix.CharlesbeganhisconsultingcareerwithSupportTechnologiesandAndersenConsulting.Asthechieftechnologyofficerof318,Inc.,aconsultingfirminSantaMonica,California,Charlesbuiltandnurturedateamofover50engineers,whichwasthelargestMacteamintheworldatthattime.CharlesisnowaproductmanageratJAMFSoftware,withafocusonBushel(http://www.bushel.com).
CharleshasspokenatavarietyofconferencesincludingDefCon,BlackHat,LinuxWorld,MacWorld,MacSysAdmin,andAppleWorldwideDevelopersConference.Charleshasalsowritten12books,over3,000blogposts,andanumberofprintedarticlesonAppleproducts.
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AbouttheReviewersJeremyAgostinoisalongtimeMacandiOSdeveloperwithaprofessionalfocusonhardwaresupportanddevicedrivers.HehasassistedinthedesignandimplementationofcustomtechnicalsolutionstomanagesomeofthelargestiOSdeploymentsintheU.S.JeremyiscurrentlyleadingtheengineeringteamatGroundControlSolutions,whereheisdevelopingapowerfuldeploymentandmanagementtoolforiOSdevices.
WilliamSmithisasolutionsarchitectfor318,Inc.,whichisanITconsultancythatisbasedinSantaMonica,California.Heisatechnologyveteranwithmorethan20yearsofexperience.HelivesinSaintPaul,Minnesota,wherehehasprovidedtrainingandconsultingservicesonbehalfofcustomerssuchasAppleandJAMFSoftware.
WilliamenjoyswritingandpresentingontechnologytopicsandhehasspokenatJAMFNationUserConference,MacIT,PSUMacAdmins,andotherconferences.HehasbeenaMicrosoftMVPformorethan11yearsandisco-ownerofOfficeforMacHelp.com.Currently,heisapartofthesteeringcommitteeforthenewTwinCitiesMacAdminsprofessionalsgroup—acommunitythatsupportsallthingsApple,fromeducationtoenterprise.
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PrefaceNowadays,iOSisbecomingmoreandmoreprevalentincompaniesandlargerorganizations.WhetherthisisatrendthatisdrivenbyBringYourOwnDevice(BYOD)orsomethingthatiscomingfromwithintheITdepartment,ourknowledgeofplatformsisbeingstretchedmoreandmoreallthetime.It’sgettingharderandhardertobeanexpertoneveryplatformthatisinuseinourorganizations!
YouneedtosecureyouriOSdevices.LearningiOSsecuritygivesyoutheknowledgetobuildsecurityintolarge-scaleiOSdeployments.Thisbooktakesyouthroughgoodsecuritypractices;theseincludeconfiguringprivacyoptionstokeeppersonaldataawayfrompryingeyes,learningaboutencryptionoptionstokeepdatasafeatrest,securingappstoreducetherisksintroducedbythird-partyapps,andthenlayingdownpracticalstepsandproceduresforcarryingoutthesesteps,bothon-screenondevicesandatscaleusingAppleConfigurator,profiles,andMobileDeviceManagement(MDM)solutions.
Thisbookalsoincludesasectionondebuggingandviewingdatasothatyoucancheckouthowtofurthersecureitemsnotcoveredindetailinthebook.Weteachyouhowtoprovideenterprise-classsecuritytoyouriPhone,iPad,andiPodTouchdeployments.Thisincludesaquickrun-downofbasicsecuritystepsandmassdeploymentofthesestepstoaidinyourlarge-scaledeploymentofiOSdevices.
Thisbookismeanttobeaneasy-to-digestguidethatfollowsreal-worldexamplestoimplementbestsecuritypractices.Eachtopiciscoveredinatheoreticalcontextandfurtherresourcesareprovidedwheretheyareneeded/applicable.
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WhatthisbookcoversChapter1,iOSSecurityOverview,isaquick-and-dirtyoverviewofthemanystepstotaketoinitiallysecureaniPad,iPhone,andiPodTouch.Thepurposeofthischapterisn’ttogointotoomuchdepthwithanygiventechnology,buttoprovideacheatsheetofsortstogetyoustartedwithiOSsecurity.
Chapter2,IntroducingAppSecurity,isamorethoroughreviewofhowtochooseappsandsecurethemduringaniOSdeployment.Here,welookatanoverviewofsandboxingtechniquesandhowtouseSingleAppModeandkeybags.Wealsolookatin-houseApps.
Chapter3,EncryptingDevices,explainstheencryptiontypesandtechniquesthatareusediniOS.Here,welookatTouchID,ApplePay,networkencryption,andprivacyconcerns.
Chapter4,OrganizationalControls,introducesAppleConfiguratorandprofilemanagement.Here,wealsolookattheFindMyiPhoneappasitpertainstoActivationLock,ActiveSyncpolicies(EASPolicies),anddevicesupervision.
Chapter5,MobileDeviceManagement,looksatApple’sProfileManagerandasimplethird-partyMDMcalledBushel.Here,welookatOvertheAir(OTA)profilemanagement.
Chapter6,DebuggingandConclusion,coverswaystotroubleshootanddebugdevicesinlargerdeployments.Inthischapter,we’lllookathowtofindlogsandinterpretthem,howtogetmoredatathanyoucanusefromdevices,andthenwewillwrapupthebook.
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WhatyouneedforthisbookThisbookfocusesonusingaMactomanageAppleiOSdevices.Therefore,youshouldhaveaMacthatrunsOSX10.10orahigherversionandaniOSdevicethatrunsiOS8orahigherversion.YoucanuseaWindowsorLinuxcomputerinsteadofaMac,butnotallofthecontentcoveredinthisbookwillbeapplicableifyoudothis.
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WhothisbookisforThisbookisintendedforsystemsadministratorsandsecurityprofessionalswhowanttolearnhowtoimplementgoodsecuritypracticesoniOSdevices.ThereadersshouldknowsomethingabouttheInformationTechnologyindustry,buttheyneednotbeveteranswhohaveanexperienceofmorethan30years.
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ConventionsInthisbook,youwillfindanumberofstylesoftextthatdistinguishbetweendifferentkindsofinformation.Herearesomeexamplesofthesestyles,andanexplanationoftheirmeaning.
Codewordsintext,databasetablenames,foldernames,filenames,fileextensions,pathnames,dummyURLs,userinput,andTwitterhandlesareshownasfollows:“Whilenotexactlysimple,onecoulduseopensslonvariousoperatingsystems,intandemwitharootcertificatefromatrustedcertificateauthority,toapplysignaturestoconfigurationprofiles,whichdeviceswillthenseeastrusted.”
Anycommand-lineinputoroutputiswrittenasfollows:
codesign-d-vv/Users/abanks/Music/iTunes/iTunes\Media/Mobile\
Applications/Dropbox\3.5.2/Payload/Dropbox.app
Newtermsandimportantwordsareshowninbold.Wordsthatyouseeonthescreen,inmenusordialogboxesforexample,appearinthetextlikethis:“ThisisexposedtoenduserswithaSendAllTrafficsliderwhenoptional.
NoteWarningsorimportantnotesappearinaboxlikethis.
TipTipsandtricksappearlikethis.
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Chapter1.iOSSecurityOverviewOutofthebox,iOSisoneofthemostsecureoperatingsystemsavailable.Thereareanumberoffactorsthatcontributetotheelevatedsecuritylevel.Theseincludethefactthatuserscannotaccesstheunderlyingoperatingsystem.Appsalsohavedatainasilo(sandbox),soinsteadofaccessingthesystem’sinternalstheycanaccessthesilo.AppdeveloperschoosewhethertostoresettingssuchaspasswordsintheapporoniCloudKeychain,whichisasecurelocationforsuchdataonadevice.Finally,Applehasanumberofcontrolsinplaceondevicestohelpprotectuserswhileprovidinganelegantuserexperience.
However,devicescanbemadeevenmoresecurethantheyarenow.Inthischapter,we’regoingtogetsomebasicsecuritytasksunderourbeltinordertogetsomebasicbestpracticesofsecurity.Wherewefeelmoreexplanationisneededaboutwhatwedidondevices,we’llexplorethetechnologyitselfeitherinthischapter,orothers.
Thischapterwillcoverthefollowingtopics:
PairingBackingupyourdeviceInitialsecuritychecklistSafariandbuilt-inappprotectionPredictivesearchandspotlight
TokickofftheoverviewofiOSsecurity,we’llquicklysecureoursystemsbyinitiallyprovidingasimplechecklistoftasks,wherewe’llconfigureafewdeviceprotectionsthatwefeeleveryoneshoulduse.Then,we’lllookathowtotakeabackupofourdevicesandfinally,athowtouseabuilt-inwebbrowserandprotectionsaroundabrowser.
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PairingWhenyouconnectadevicetoacomputerthatrunsiTunesforthefirsttime,youarepromptedtoenterapassword.Doingsoallowsyoutosynchronizethedevicetoacomputer.ApplicationsthatcancommunicateoverthischannelincludeiTunes,iPhoto,Xcode,andothers.
TopairadevicetoaMac,simplyplugthedevicein(ifyouhaveapasscode,you’llneedtoenterthatinordertopairthedevice.)Whenthedeviceispluggedin,you’llbepromptedonboththedeviceandthecomputertoestablishatrust.SimplytaponTrustontheiOSdevice,asshowninthefollowingscreenshot:
Trustingacomputer
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ForthecomputertocommunicatewiththeiOSdevice,you’llalsoneedtoacceptthepairingonyourcomputer(although,whenyouuselibimobiledevice,whichisthecommandtopair,doesnotrequiredoingso,becauseyouusethecommandlinetoaccept.ThiscommandiscoveredinChapter6,DebuggingandConclusion).Whenprompted,clickonContinuetoestablishthepairing,asseeninthefollowingscreenshot(thescreenshotisthesameinWindows):
Trustingadevice
Whenadeviceispaired,afileiscreatedin/var/db/lockdown,whichistheUDIDofthedevicewithapropertylist(plist)extension.ApropertylistisanAppleXMLfilethatstoresavarietyofattributes.InWindows,iOSdataisstoredintheMobileSyncfolder,whichyoucanaccessbynavigatingto\Users\(username)\AppData\Roaming\AppleComputer\MobileSync.Theinformationinthisfilesetsupatrustbetweenthecomputersandincludesthefollowingattributes:
DeviceCertificate:Thiscertificateisuniquetoeachdevice.EscrowBag:ThekeybagofEscrowBagcontainsclasskeysusedtodecryptthedevice.HostCertificate:Thiscertificateisforthehostwho’spairedwithiOSdevices(usually,thesameforallfilesthatyou’vepaireddeviceswith,onyourcomputer).HostID:ThisisageneratedIDforthehost.HostPrivateKey:ThisistheprivatekeyforyourMac(shouldbethesameinallfilesonagivencomputer).RootCertificate:Thisisthecertificateusedtogeneratekeys(shouldbethesameinallfilesonagivencomputer).RootPrivateKey:ThisistheprivatekeyofthecomputerthatrunsiTunesforthatdevice.SystemBUID:ThisreferstotheIDofthecomputerthatrunsiTunes.WiFiMACAddress:ThisistheMacaddressoftheWi-Fiinterfaceofthedevicethatispairedtothecomputer.IfyoudonothaveanactiveWi-Fiinterface,MACisstillusedwhilepairing.
Whydoesthismatter?It’simportanttoknowhowadeviceinterfaceswithacomputer.Thesefilescanbemovedbetweencomputersandcontainavarietyofinformationaboutadevice,includingprivatekeys.
Havingkeysisn’tallthatisrequiredforacomputertocommunicatewithadevice.When
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thedevicesareinterfacingwithacomputeroverUSB,ifyouhaveapasscodeenabledonthedevice,youwillberequiredtoenterthatpasscodeinordertounlockthedevice.
Onceacomputerisabletocommunicatewithadevice,youneedtobecarefulasthebackupsofadevice,appsthatgetsynchronizedtoadevice,andotherdatathatgetsexchangedwithadevicecanbeexposedwhileatrestondevices.
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BackingupyourdeviceWhatdomostpeopledotomaximizethesecurityofiOSdevices?Beforewedoanything,weneedtotakeabackupofourdevices.Thisprotectsthedevicefromusbyprovidingarestorepoint.Thisalsosecuresthedatafromthepossibilityoflosingitthroughasillymistake.Therearetwoways,whicharemostcommonlyusedtotakebackups:iCloudandiTunes.Asthenamesimply,thefirstmakesbackupsforthedataonApple’scloudserviceandthesecondondesktopcomputers.
We’llcoverhowtotakeabackuponiCloudfirst.
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iCloudbackupsAniCloudaccountcomeswithfreestorage,tobackupyourAppledevices.AniOSdevicetakesabackuptoAppleserversandcanberestoredwhenanewdeviceissetupfromthosesameservers(it’sascreenthatappearsduringtheactivationprocessofanewdevice.Also,itappearsasanoptioniniTunesifyoubackuptoiTunesoverUSB—coveredlaterinthischapter).
SettingupandcheckingthestatusofiCloudbackupsisastraightforwardprocess.FromtheSettingsapp,taponiCloudandthenBackup.AsyoucanseefromtheBackupscreen,youhavetwooptions,iCloudBackup,whichenablesautomaticbackupsofthedevicetoyouriCloudaccount,andBackUpNow,whichrunsanimmediatebackupofthedevice.
iCloudbackups
AllowingiCloudtotakebackupsondevicesisoptional.Asyou’llseeinChapter5,MobileDeviceManagement,andChapter6,DebuggingandConclusion,youcandisableaccesstoiCloudandiCloudbackups.However,doingsoisrarelyagoodideaasyouarelimitingthefunctionalityofthedeviceandputtingthedataonyourdeviceatrisk,ifthatdataisn’tbackedupanotherwaysuchasthroughiTunes.Manypeoplehavereservationsaboutstoringdataonpublicclouds;especially,dataasprivateasphonedata(texts,phone
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callhistory,andsoon).FormoreinformationonApple’ssecurityandprivacyaroundiCloud,refertohttp://support.apple.com/en-us/HT202303.IfyoudonottrustAppleoritscloud,thenyoucanalsotakeabackupofyourdeviceusingiTunes,describedinthenextsection.
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TakingbackupsusingiTunesOriginally,iTuneswasusedtotakebackupsforiOSdevices.YoucanstilluseiTunesandit’slikelyyouwillhaveasecondbackupevenifyouareusingiCloud,simplyforaquickrestoreifnothingelse.
Backupsareusuallyprettysmall.Thereasonisthattheoperatingsystemisnotpartofbackups,sinceuserscan’teditanyofthosefiles.Therefore,youcanuseanipswfile(theoperatingsystem)torestoreadevice.
TheseareaccessedthroughAppleConfigurator(whichiscoveredfurtherinChapter4,OrganizationalControls),orthroughiTunesifyouhavearestorefilewaitingtobeinstalled.Thesecanbeseenin~/Library/iTunes,andthenameofthedeviceanditssoftwareupdates,ascanbeseeninthefollowingscreenshot:
IPSWfiles
Backupsarestoredinthe~/Library/ApplicationSupport/MobileSync/Backupdirectory.Here,you’llseeanumberofdirectoriesthatareassociatedwiththeUDIDofthedevices,andwithinthose,you’llseeanumberoffilesthatmakeupthemodularincrementalbackupsbeyondtheinitialbackup.It’saprettysmartsystemandallowsyoutorestoreadeviceatdifferentpointsintimewithouttakingtoolongtoperformeachbackup.
Backupsarestoredinthe\DocumentsandSettings\USERNAME\ApplicationData\AppleComputer\MobileSync\Backup\directoryonWindowsXPandinthe\Users\USERNAME\AppData\Roaming\AppleComputer\MobileSync\Backup\directoryforneweroperatingsystems.
ToenableaniTunesbackup,plugadeviceintoacomputer,andthenopeniTunes.Clickonthedeviceforittoshowthedevicedetailsscreen.ThetopsectionofthescreenisforBackups(inthefollowingscreenshot,youcansetabackuptoThiscomputer,whichtakesabackuponthecomputeryouareon).
TipIwouldrecommendyoutoalwayschoosetheEncryptiPhonebackupoptionasitforcesyoutosaveapasswordinordertorestorethebackup.
Additionally,youcanusetheBackUpNowbuttontokickoffthefirstbackup,asshown
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ViewingiOSdatainiTunesToshowwhyit’simportanttoencryptbackups,let’slookatwhatcanbepulledoutofthosebackups.Thereareafewtoolsthatcanextractbackups,providedyouhaveapassword.Here,we’lllookatiBackupExtractortoviewthebackupofyourbrowsinghistory,calendars,callhistory,contacts,iMessages,notes,photos,andvoicemails.
Togetstarted,downloadiBackupExtractorfromhttp://www.wideanglesoftware.com/ibackupextractor.WhenyouopeniBackupExtractorforthefirsttime,simplychoosethedevicebackupyouwishtoextractiniBackupExtractor.Asyoucanseeinfollowingscreenshot,youwillbepromptedforapasswordinordertounlocktheBackupkeybag.Enterthepasswordtounlockthesystem.
Unlockthebackups
NotethatthefiletreeinthefollowingscreenshotgivesawaysomeinformationonthestructureoftheiOSfilesystem,oratleast,thedatastoredinthebackupsoftheiOSdevice,whichwe’llcoverindetailinChapter6,DebuggingandConclusion.Fornow,simplyclickonBrowsertoseealistoffilesthatcanbeextractedfromthebackup,asyoucanseeinthenextscreenshot:
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ViewdevicecontentsusingiBackupExtractor
NotetheprevalenceofSQLdatabasesinthefiles.Mostappsusethesetypesofdatabasestostoredataondevices.Also,checkouttheotheroptionssuchasextractingnotes(manythatwerepossiblydeleted),texts(somethathavebeendeletedfromdevices),andothertypesofdatafromdevices.
Nowthatwe’veexhaustedbackupsandproventhatyoushouldreallyputapasswordinplaceforyourbackups,let’sfinallygettosomebasicsecuritytaskstobeperformedonthesedevices!
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InitialsecuritychecklistApplehasbuiltiOStobeoneofthemostsecureoperatingsystemsintheworld.Thishasbeenmadepossiblebyrestrictingaccesstomuchoftheoperatingsystembyendusers,unlessyoujailbreakadevice.Inthisbook,wedon’tcoverjail-breakingdevicesmuchduetothefactthatsecuringthedevicesthenbecomesawholenewtopic.Instead,wehavefocusedonwhatyouneedtodo,howyoucandothosetasks,whattheimpactsare,and,howtomanagesecuritysettingsbasedonapolicy.
ThebasicstepsrequiredtosecureaniOSdevicestartwithencryptingdevices,whichisdonebyassigningapasscodetoadevice.WewillthenconfigurehowmuchinactivetimebeforeadevicerequiresaPINandaccordinglymanagetheprivacysettings.Thesesettingsallowustogetsomeverybasicsecurityfeaturesunderourbelt,andsetthestagetoexplainwhatsomeofthefeaturesactuallydo,andhowwecansetthemviaapolicyinsubsequentchaptersofthisbook.
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ConfiguringapasscodeThefirstthingmostofusneedtodoonaniOSdeviceisconfigureapasscodeforthedevice.Severalthingshappenwhenapasscodeisenabled,asshowninthefollowingsteps:
1. Thedeviceisencrypted.2. Thedevicethenrequiresapasscodetowakeup.3. Anidletimeoutisautomaticallysetthatputsthedevicetosleepafterafewminutes
ofinactivity.
Thismeansthatthreeofthemostimportantthingsyoucandotosecureadeviceareenabledwhenyousetupapasscode.
Bestofall,Applerecommendssettingupapasscodeduringtheinitialsetupofnewdevices.Youcanmanagepasscodesettingsusingpolicies(orprofilesasApplelikestocalltheminiOS),whichwewillcoverinChapter4,OrganizationalControls,andChapter5,MobileDeviceManagement.
Bestofall—youcansetapasscodeandthenuseyourfingerprintontheHomebuttoninsteadofthatpasscode.Wehavefoundthatbythetimeourphoneisoutofourpocketandifourfingerisonthehomebutton,thedeviceisunlockedbythetimewecheckit.WithiPhone6andhigherversions,youcannowusethatsamefingerprinttosecurepaymentinformation,whichiscoveredinChapter2,IntroducingAppSecurity.
Checkwhetherapasscodehasbeenconfigured,andifneeded,configureapasscodeusingtheSettingsapp.TheSettingsappisbydefaultontheHomescreenwheremanysettingsonthedevice,includingWi-Finetworksthedevicehasbeenjoinedto,apppreferences,mailaccounts,andothersettingsareconfigured.
Tosetapasscode,opentheSettingsappandtaponTouchID&PasscodeIfapasscodehasbeenset,youwillseetheTurnPasscodeOff(asseeninthefollowingscreenshot)optionIfapasscodehasnotbeenset,thenyoucandosoatthisscreenaswellAdditionally,youcanchangeapasscodethathasbeensetusingtheChangePasscodebuttonanddefineafingerprintoradditionalfingerprintsthatcanbeusedwithatouchID
TherearetwooptionsintheUSETOUCHIDFORsectionofthescreen.Youcanchoosewhether,ornot,youneedtoenterthepasscodeinordertounlockaphone,whichyoushoulduseunlessthedeviceisalsousedbysmallchildrenorasakiosk.Inthesecases,youdon’tneedtoencryptortakeabackupofthedeviceanyway.ThesecondoptionistoforcetheenteringofapasscodewhileusingtheAppStoreandiTunes.Thiscancostyoumoneyifsomeoneelseisusingyourdevice,soletthedefaultvalueremain,whichrequiresyoutoenterapasscodetounlocktheoptions.
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ConfigureaPasscode
Thepasscodesettingsareveryeasytoconfigure;so,theyshouldbeconfiguredwhenpossible.Scrolldownonthisscreenandyou’llseeseveralotherfeatures,asshowninthenextscreenshot.ThefirstoptiononthescreenisSimplePasscode.MostuserswanttouseasimplepinwithaniOSdevice.Tryingtousealphanumericandlongpasscodessimplycausesmostuserstotrytocircumventtherequirement.Toaddafingerprintasapasscode,simplytaponAddaFingerprint…,whichyoucanseeintheprecedingscreenshot,andfollowtheonscreeninstructions.
Additionally,thefollowingcanbeaccessedwhenthedeviceislocked,andyoucanchoosetoturnthemoff:
Today:Thisshowsanoverviewofupcomingcalendaritems
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NotificationsView:Thisshowsyoutherecentpushnotifications(appsthathaveupdatesonthedevice)Siri:ThisrepresentsthevoicecontrolofthedevicePassbook:ThistoolisusedtomakepaymentsanddisplayticketsforconcertvenuesandmeetupsReplywithMessage:Thistoolallowsyoutosendatextreplytoanincomingcall(usefulifyou’reonthetreadmill)
Eachorganizationcandecidewhetheritconsiderstheseoptionstobeasecurityriskanddirectusershowtodealwiththem,ortheycanimplementapolicyaroundtheseoptions.
PasscodeSettings
Therearen’talotofsecurityoptionsaroundpasscodesandencryptionbecausebyand
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large,Applesecuresthedevicebygivingyoufeweroptionsthanyou’llactuallyuse.Underthehood,(forexamplethroughAppleConfiguratorandMobileDeviceManagement,coveredinChapter4,OrganizationalControlsandChapter5,MobileDeviceManagement,respectively)therearealotofotheroptions,butthesearen’texposedtoendusersofdevices.Forthemostpart,asimplefour-characterpasscodewillsufficeformostenvironments.Whenyoucomplicatepasscodes,devicesbecomemuchmoredifficulttounlock,anduserstendtolookforwaysaroundpasscodeenforcementpolicies.Thepasscodeisonlyusedonthedevice,socomplicatingthepasscodewillonlyreducethelikelihoodthatapasscodewouldbeguessedbeforeswipingopenadevice,whichtypicallyoccurswithin10tries.
Finally,todisableapasscodeandthereforeencryption,simplygototheTouchID&PasscodeoptionintheSettingsappandtaponTurnPasscodeOff.
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ConfiguringprivacysettingsOnceapasscodeissetandthedeviceisencrypted,it’stimetoconfiguretheprivacysettings.Third-partyappscannotcommunicatewithoneanotherbydefaultiniOS.Therefore,youmustenablecommunicationbetweenthem(alsobetweenthird-partyappsandbuilt-iniOSappsthathaveAPIs).ThisisafundamentalconceptwhenitcomestosecuringiOSdevices.
Toconfigureprivacyoptions,opentheSettingsappandtapontheentryforPrivacy.OnthePrivacyscreen,you’llseealistofeachappthatcanbecommunicatedwithbyotherapps,asshowninthefollowingscreenshot:
PrivacyOptions
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Asanexample,tapontheLocationServicesentry,asshowninthenextscreenshot.Here,youcansetwhichappscancommunicatewithLocationServicesandwhen.IfanappissettoWhileUsing,theappcancommunicatewithLocationServiceswhentheappisopen.IfanappissettoAlways,thentheappcanonlycommunicatewithLocationServiceswhentheappisopenandnotwhenitrunsinthebackground.
ConfigureLocationServices
OnthePrivacyscreen,taponPhotos.Here,youhavefeweroptionsbecauseunlikethelocationofadevice,youcan’taccessphotoswhentheappisrunninginthebackground.Here,youcanenableordisableanappbycommunicatingwiththephotolibraryonadevice,asseeninthenextscreenshot:
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ConfigurewhatAppscanaccessyourCameraRoll
EachappshouldbeconfiguredinsuchawaythatitcancommunicatewiththefeaturesofiOSorotherappsthatareabsolutelynecessary.
OtherprivacyoptionswhichyoucanconsiderdisablingincludeSiriandHandoff.SirihasthevoicecontrolsofaniOS.BecauseSiricanbeusedevenwhenyourphoneislocked,considertodisableitbyopeningtheSettingsapp,tappingonGeneralandthenonSiri,andyouwillbeabledisablethevoicecontrols.TodisableHandoff,youshouldusetheGeneralSystemPreferencepaneinanyOSXcomputerpairedtoaniOSdevice.There,unchecktheAllowHandoffbetweenthisMacandyouriClouddevicesoption.
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Safariandbuilt-inAppprotectionsWebbrowsershaveaccesstoalotofdata.Oneofthemostpopulartargetsonotherplatformshasbeenwebbrowsers.ThedefaultbrowseronaniOSdeviceisSafari.
OpentheSettingsappandthentaponSafari.TheSafaripreferencestosecureiOSdevicesincludethefollowing:
Passwords&AutoFill:Thisisascreenthatincludescontactinformation,alistofsavedpasswordsandcreditcardsusedinwebbrowsers.ThisdataisstoredinaniCloudKeychainifiCloudKeychainhasbeenenabledinyourphone.Favorites:Thisperformsthefunctionofbookmarkmanagement.ThisshowsbookmarksiniOS.OpenLinks:Thisconfigureshowlinksaremanaged.BlockPop-ups:Thisenablesapop-upblocker.
Scrolldownandyou’llseethePrivacy&Securityoptions(asseeninthenextscreenshot).Here,youcandothefollowing:
DoNotTrack:Bythis,youcanblockthetrackingofbrowsingactivitybywebsites.BlockCookies:Acookieisasmallpieceofdatasentfromawebsitetoavisitor’sbrowser.Manysiteswillsendcookiestothird-partysites,sothemanagementofcookiesbecomesanobstacletotheprivacyofmany.Bydefault,Safarionlyallowscookiesfromwebsitesthatyouvisit(AllowfromWebsitesIVisit).SettheCookiesoptiontoAlwaysBlockinordertodisableitsabilitytoacceptanycookies;settheoptiontoAlwaysAllowtoacceptcookiesfromanysource;andsettheoptiontoAllowfromCurrentWebsiteOnlytoonlyallowcookiesfromcertainwebsites.FraudulentWebsiteWarning:Thisblocksphishingattacks(sitesthatonlyexisttostealpersonalinformation).ClearHistoryandWebsiteData:Thisclearsanycachedhistory,webfiles,andpasswordsfromtheSafaribrowser.UseCellularData:Whenthisoptionisturnedoff,itdisableswebtrafficovercellularconnections(sowebtrafficwillonlyworkwhenthephoneisconnectedtoaWi-Finetwork).
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ConfigurePrivacySettingsforSafari
TherearealsoanumberofadvancedoptionsthatcanbeaccessedbyclickingontheAdvancedbutton,asshowninthefollowingscreenshot:
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ConfiguretheAdvancedSafariOptions
Theseadvancedoptionsincludethefollowing:
WebsiteData:Thisoption(asyoucanseeinthenextscreenshot)showstheamountofdatastoredfromeachsitethatcachesfilesonthedevice,andallowsyoutoswipeleftontheseentriestoaccessanyfilessavedforthesite.TaponRemoveAllWebsiteDatatoremovedataforallthesitesatonce.JavaScript:ThisallowsyoutodisableanyJavaScriptsfromrunningonsitesthedevicebrowses.WebInspector:ThisshowsthedeviceintheDevelopmenuonacomputerconnectedtothedevice.IftheWebInspectoroptionhasbeendisabled,useAdvancedPreferencesintheSafariPreferencesoptionofSafari.
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Viewwebsitedataondevices
Browsersecurityisanimportantaspectofanyoperatingsystem.
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PredictivesearchandspotlightThefinalaspectofsecuringthesettingsonaniOSdevicethatwe’llcoverinthischapterincludespredictivesearchandspotlight.WhenyouusethespotlightfeatureiniOS,usagedataissenttoApplealongwiththeinformationfromLocationServices.Additionally,youcansearchforanythingonadevice,includingitemspreviouslyblockedfrombeingaccessed.Theabilitytosearchforblockedcontentwarrantstheinclusioninlockingdownadevice.
Thatdataisthenusedtogeneratefuturesearches.ThisfeaturecanbedisabledbyopeningtheSettingsapp,taponPrivacy,thenLocationServices,andthenSystemServices.SimplyslideSpotlightSuggestionstoOfftodisablethelocationdatafromgoingoverthatconnection.Tolimitthetypeofdatathatspotlightsends,opentheSettingsapp,taponGeneral,andthenonSpotlightSearch.Uncheckeachitemyoudon’twantindexedintheSpotlightdatabase.Thefollowingscreenshotshowsthementionedoptions:
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ConfigureWhatSpotlightIndexes
Nowthatwe’velookedatsomebasictacticaltasksthatsecuredevices,it’stimetoturnourattentiontothetheorybehindsomeoftheseandtomakesureyourappsaresecure,inthenextchapter.
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SummaryThischapterwasawhirlwindofquickchangesthatsecureadevice.Here,wepaireddevices,tookabackup,setapasscode,andsecuredappdataandSafari.Thisisbyfarthesimplestchapterofthisbook,butalsolaysthegroundworktocoversomeofthemoreesotericcontent.Inthischapter,weshowedhowtomanuallydosometasksthatwewillsetviapolicieslaterinthebook.
Inthenextchapter,wewillmoveontosecuringappsandlearnhowappscommunicatewithoneanother.
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Chapter2.IntroducingAppSecurityInthischapter,wewilllookatoneofthemostimportantthingstosecureoniOS:apps.Thisincludesdatawithinapps,thecontextinwhichappsareallowedtorun,howappscommunicateviaextensions,andhownewerfeaturesinOScontinuetoputthefocusonanAppleIDasthemostimportantaccounttocontrolonyourdevice.However,thereasonwhymostpeoplesignupforanAppleIDistoinstallapps.
ManyoftheconceptsdiscussedinthischapterwillbeanadditiontoorareinforcementofourknowledgeabouttheOSXarchitectureuponwhichiOSisbased,whichwillbeespeciallyhelpfulifyouarecomingfromtheWindowsorBlackberryplatforms.EvenLinux,withitsprocessmodelechoingUnix,stillhasenoughnotabledifferenceswiththeappliance-stylecomputingexperienceshowcasedoniOSthatitwillbehelpfultocoverthesemorefundamentalpoints.Wewillalsobrieflytouchonin-houseappdevelopment,whichcanbeaugmentedbythemanagementsystemsthatwewillbediscussinginChapter4,OrganizationalControls,andChapter5,MobileDeviceManagement.
Thetopicsthatwewillcoverinthischapter,whichunderpinappsecurity,include:
Howappsaredistributed,installed,andrestrictedSingleappmode(alsoknownasLocktoApp)andGuidedAccessTraditionalandcurrentinter-app(anddevice)communicationClarificationofwhenkeybagsareutilizedbyiOSKeyboards,sandboxing,andextensionsIntroductiontosecurelydistributingcustomin-houseapps
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InstallingappsHowtoinstallanappisconsideredatrivialexerciseatthispoint,withcommonadvertisementsdoingnothingmorethanshowingtheiconsoftheplatformtosuggestthattheywantyoutogettheirappfromthecorrespondingstore.Thatbeingsaid,thereareotherwaystodownloadandinstallanappthansimplyopeninganappstoreonadeviceandtappingonGet.Anappcanbepushedovertheairwithmanagementsystems,putonthedevicewithtoolssuchasAppleConfigurator(discussedinChapter4,OrganizationalControls),andinstalledonceitiscompiledfromthesourcecodewithXcode(Apple’sIntegratedDevelopmentEnvironment(IDE),whichisdiscussedwithothertoolsthatcanperforminstallationsinChapter6,DebuggingandConclusion).
ThereisnoconceptofsideloadingappsoniOSincomparisontootherplatformswhereyoumaybeabletoplaceadeviceintodevelopermode.Likewiseyouwilllikelyneverhaveimplicitorotherwisestatedencouragementtogainrootaccesstothedevice.We’lldiscoverthelengthstowhichApplegoestoensurethisinthenextchapter,butsufficeittosaythatyousimplycannottransferabinarytoaniOSdeviceandbringaboutasystem-widechangeinanybuttheendorsedwayswhileplayingwithinApple’sso-calledwalledgarden.
AppsthemselvescanonlybedistributedbyAppleviatheAppStorethat’savailableonthedevice,andiniTunesonaMacorPC,throughaspecialBusiness-to-BusinessstorewiththeVolumePurchaseProgram,orwhenexplicitlyassociatedwithanAppleDeveloperProgram.Theselimitedoptionsdecreasetheroutesthroughwhichapplicationscanbeacquired,butifyouhaveadeveloperaccount,youcancompileapplicationsreleasedasopensourceandinstallthemondevicesatwill.Similarly,thecompressed.ipaarchivethatcontainsaniOSapplicationcanbetransferredlikeanydata,butgettingtheinstallerprocessintheOStopickuponitisanothermatter.
Securityaroundappinstallationmanifestsitselfinthefactthatthekernelperformsverificationatinstallationtimeandeverysubsequentlaunchtoensurethattheexecutablebundleandframeworksinsidethearchivehavebeensignedwithanapproveddeveloper’scertificatethatAppletrusts.ThereisnoinstallerbinaryforIPAfilesoniOS,soverificationliketheonethatisdonewiththepkgencapsulationformatontheMacisnotapartoftheprocess.Aslongasthecodedeliveredbyanarchivechecksoutassigned,itisallowedtobeinstalledandrun.Onecanspeculatethatthisallowsmorecachingpossibilitiessincethereislesslikelihoodofcorruption,asallyouneedtochangeistheDigitalRightsManagement(DRM)softwareupondeliverytoanewdevice.
YoucanseetheappsignatureverificationprocessonaMacusingthefollowingsteps:
1. First,downloadanappfromiTunesandnavigatetoitintheFinder.Normally,itcanbefoundbynavigatingto/Users/yourusername/Music/iTunes/MobileApplications,Duplicatethefile(ifyou’dliketokeepafresh,unalteredversion)andhighlightthecopy.Then,fromtheFilemenu,chooseOpenWith|ArchiveUtilitytoexpandit.
2. Youwillthenseeafolderofthesamenamewithseveralthingsinsideit,oneof
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whichisafolderlabeledPayload.3. LaunchtheTerminalapplicationthatyouwillfindintheOtherfolderin
Launchpad.Youwouldfirsttypecodesign–d–vvandthendraganddroptheapplicationyoufindinsidethePayloadfolder,andthenhitreturn.Onexecutingthecommand,youwillseesomethinglikethefollowing:
codesign-d-vv/Users/abanks/Music/iTunes/iTunes\Media/Mobile\
Applications/Dropbox\3.5.2/Payload/Dropbox.app
Executable=/Users/abanks/Music/iTunes/iTunesMedia/Mobile
Applications/Dropbox3.5.2/Payload/Dropbox.app/Dropbox
Identifier=com.getdropbox.Dropbox
Format=bundlewithMach-Ouniversal(armv7arm64)
CodeDirectoryv=20200size=54086flags=0x0(none)hashes=2695+5
location=embedded
Signaturesize=3487
Authority=AppleiPhoneOSApplicationSigning
Authority=AppleiPhoneCertificationAuthority
Authority=AppleRootCA
Anoutputsuchastheprecedingonewillappear,whichwillshowthechainoftrustinaction.Apple’sRootCertificateAuthority(CA)ispresentasatrustedauthoritytoverifythattheapplicationinsidethe.ipafilethatweacquiredhasnotbeentamperedwith.
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BlockingaccesstotheAppStoreOnecanpotentiallyhidetheAppStoreapplicationonthedevice,butifthedevicecanstillconnecttoanenduserscomputerthatisrunningiTunes,youwillnotbeabletoeffectivelycutofftheinstallationofapps.
NoteTherehavebeenadditional,undocumentedwaystohidefeaturesandappsthatareactuallypresentonadeviceincertainjurisdictions,mostofwhichrelyinsomepartonconfigurationprofiles,butthatisbeyondthescopeofthisbook.
Asdemonstratedbytheaccessgrantedtodataonthedevicebybackingituptoacomputerinthelastchapter,whenallowingenduserstodirectlyinteractwiththebackupprocess,itshouldbethoroughlyexaminedandaccountedforinawrittenpolicy.
ThemostsimplisticformofapplyingmanagementtoaniOSdeviceistonavigatetoSettings|General|Restrictions,taponEnableRestrictions,andthensetanewpasswordthatisdistinctfromtheoneusedtounlockthedevice.Then,youcangranularlydisableInstallingApps,DeletingApps,andIn-AppPurchasesandessentiallyshutoffallinteractionswiththeappsonadevice,asshowninthefollowingfigure:
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RestrictingAppStoreFunctionality
ManagementtoolssuchasAppleConfiguratorandiTuneswillalsonotbeabletoinstallorremoveappsoncethesesettingsareenabled,whichmakescontrollingaccesstoRestrictionsofparticularimportancetoeducationalenvironments.
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SingleAppmode,AppLock,andGuidedAccessWhendevicesaremadetoworkashared-usagemodel,forexample,manynursesusingthesameiPadduringshiftsatahospital,onemethodtorestrictaccessandstandardizetheexperiencewouldbetolockthedevicetoasingleapp.Thisisreferredtobydifferentnamesbasedonhowitisinitiated,anditcanbeachievedwiththetoolsthatwewilldiscussinfuturechapters.Thedeviceshowsonlythedesignatedappandnevergoestothehomescreen(alsoreferredtointernallyastheSpringboard).TheHomebuttonisessentiallydisabledandControlCenter(whichisaccessedbyswipingupfromthebottomedgeofaniOSdevice)isalsonotaccessible.Thiscanalsoenableakiosk-typeexperience,wherethedeviceisprotectedfrommisusebydictatingthatonlyasingleappcanrun.
InrecentreleasesofiOS,developershavebeengrantedAPIstoenableapplockwhentheyenteracertainstatewithintheapporuntilaspecificrequirementismet;however,thisisapplicableonlyforappsdistributedviaMobileDeviceManagement(MDM).Thismeetsthecriteriaforeducationalusewhereyoudonotwantstudentstolookupanswers.Itcanalsopreventexfiltrationofdatawithintheappsonadeviceifyoucancoordinatewithadevelopertoenablethisfeature.Financialprocessing,securedocumentviewing,andothersensitiveappinteractionmaybenefitfromthisaswell.
YoucansimulatehowalockeddevicewillperformatanytimebyenablingafeaturecalledGuidedAccess.YoucaninitiatethismodebypressingtheHomebuttonthreetimesfromwithinanapp.Youwillthenbepresentedwithoptionstocontrolmotion(theabilitytorotatethescreens’orientation)andtheuseofthekeyboard.Itdetectsscreenelements,soyoucandesignatespecificregionsofthescreentobeoff-limits,forexample,thein-apppurchasebuttonorads.ExitingGuidedAccessrequiresyetanotherdistinctfour-digitpassword,butitcanbedisabledwiththefingerprintunlockfeatureondevicesthatareequippedwithTouchID.
Youcanfindmoreinformationaboutthisathttp://support.apple.com/HT202612.ThefollowingscreenshotshowstheGuidedAccessconfigurationscreenonaniPhone:
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EnablingGuidedAccess
Now,thefollowingscreenshotshowshowthecontrolsofanappcanbeselectivelydisabled:
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DisablingControlsinanApp
Oneofthethingsthatpeopleutilizingthisfunctionalitydiscoverasasupportconcernisthatyoucannotturnoffthedevicenorputthescreeninsleepmode.Thismakespoweringthedeviceofcriticalimportance,asdoesensuringaconsistentWi-Ficonnection;thereisnowaytore-entercredentialsorswitchnetworks.TheprecedingscreenshotsshowhowyoucanenableGuidedAccessandwhatyouwouldseewhenyouconfigureit,whereasnoconfigurationispresentedwhenusingMDMorin-appfunctionalitytoLocktoApp;furtherrestrictionsmaybenecessaryifyouwouldliketodisablein-apppurchasesorunnecessarywebviews.
TipDocumentinganobscurefeaturelikeGuidedAccessisactuallyquiteachallenge,asthe
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normal,simpletousescreenshotcontrolsonthedeviceareeffectivelydisabled.Insteadofmessingaboutwithvideocaptureviaaphysicaladapterorcable,Apple’sAirPlayfeaturecanbepairedwithanapplikeReflectorbySquirrels(http://www.airsquirrels.com/reflector/)tomirrorthescreentoaMac,PC,oranAndroiddevicefromwhichyoucanthentakescreenshots.
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AppcommunicationHistorically,veryfewaffordancesweremadewhenonedeveloperwantedtocommunicatewiththeapplicationdataofanotherdeveloper.URLschemesweremanipulatedforthispurposeandtheyallowedadeveloper’sapptobesummonedbyanidentifierthatwasusuallybasedonthebundleID.InthelastfewmajorreleasesofiOS,therewasatleasttheaffordanceforsharedcredentialstobeaccessedbetweenappsbythesamedeveloper.Thissharingofakeychainbyanappgroupnowalsoincludesthesharingoffilestorageandpreferencedata,whichwaspreviouslyaccomplishedbyseparateaccountswiththird-partysyncserviceslikeDropbox.iCloudDrivehasbeenintroducedtoperformsimilaradhocfilestorageandsharingtasks.Ifthissoundssomewhatlimiting,it’sbecausehistoricallyithasbeen,butwewilltouchuponthenewwaysinwhichappfunctionalityanddatacanleakoutfromtheone-app-at-a-timesiloafterwediscusshowappdatacannowpassmoreeasilybetweendevices.ThefollowingscreenshotshowsawebpageinSafarionaniOS8devicethatisbeingofferedtoaMacrunningOSX10.10:
AwebpageinSafarionaniOS8devicethatisbeingofferedtoaMacrunningOSX10.10
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HandoffandContinuityLet’sstartbysigningintothesameAppleIDonaMacrunningOSX10.10(Yosemite)andaniPhoneoriPadrunningiOS8.OpenawebpageinSafariontheiOSdeviceandyouwillseeaniconinyourDock(analogoustothetaskbaronWindows)tocontinueviewingthewebpageontheMac.ThisisHandoffinaction.It’salsoreferredtoundertheContinuityheadinginApple’smarketingmaterial.ManyAppleappsareshippingwiththisfunctionalityiniOS8,andthedevelopersofpopularappslikeGoogle’sChromewebbrowserarerapidlyadoptingitaswell.
iCloudandthenewestoperatingsystemsarethegluethatholdallthistogetherandthesefeaturesworkbetweeniOSdevices.ForotherContinuityfeaturessuchasphone/textmessagerelay,youmayneedtoexplicitlysetuptherelationshipbetweendeviceswhenprompted,asshowninthefollowingfigure:
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AuthorizinganiPadtoreceivetextmessages(SMSandMMS)
TipAsatroubleshootingstep,makesurethatanydevicethatwillpiggybackonaniPhone’sserviceisusingthephonenumberofaniPhoneandthee-mailaddressoftheAppleIDtoidentifyitselftoiCloud-basedservices.Youcanfindmoredetailsaboutthisathttp://support.apple.com/HT6337.
Somepeoplehavecriticizedthisduplicationofpossiblyredundantorsensitiveapplicationstatesacrossdevices,whichyouwouldbeautomaticallyopted-intouseifyouhaveaniPhoneandwhichusesthesameAppleIDandphonenumberastheprimaryidentifierofiCloud-basedservicessuchasiMessageandFaceTime.ThisincreasesthemovingpartsthatneedtobesecuredandtheimportanceofthedevicewipefeaturethatispresentinActiveSync,FindMyiPhone,andtheMDM-basedenterprisewipe.
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KeybagsandkeychainsAsdiscussedinthepreviouschapter,thekeychainisknownasawaytocentrallystoreandmanagecredentialsandothersecretdatathatareinusebyapplicationsonthebehalfoftheuser,carriedoverfromOSX.Thereisalsotheconceptofakeybag,whichinpracticeisagroupingofsecrets(ormorepractically,keys)thatallowthesystemtomanagethemovingpartsaroundspecificinteractions.Besides,whenusedbythesystemitselftomanagetheencryptionofthedata,thesedealwithprimarilywhenabackupwillruneitheroverWi-FitoiTunes,whentetheredbyUSBtoiTunes,orwhilethedeviceispluggedintoapowersourceandlockedasarequirementtosendtoiCloudBackup.
Explainingkeybagsasaconceptisaminorpoint,buttherehasbeenterminologyconfusionregardingthingssuchasthesecuringofappswithdigitalrightsmanagementandtheuseofthekeychain,neitherofwhicharedirectlyrelated.Tosummarize,keybagsareanabstractionforsecretslikekeychainitems,sotheycanbesecuredindependentofthedatawithin.Thisallowsformoreflexiblesecuritybyaddinganinteraction-specificlayertoeventssuchastherotationofcredentials,amongothercommoninteractions.
NoteSomekeychainitemscanbemarkedastiedtoaspecificdevicewhentheyarecreatedbyanapplication,disallowingthemfrombeingrestoredtoanotherdevice.Googleappearstobeusingthisintheirpopulartwo-stepauthenticationappGoogleAuthenticator,whereasotherservicesdonotimposethislimitation.
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KeyboardsandextensionsOneofthegreatlyanticipatedfeaturesofiOS8wastheconceptofExtensions.Whileshuttlingaroundthestateofanapplicationisallwellandgood,extensionsallowappstohavetheirfunctionalityappearinnewplaces.
Thisisimplementedthroughtheadditionofspecificabilitiespresentedtodevelopersthatarereferredtoasextensionpoints,withthemostanticipatedbeingthird-partykeyboards.AmorepopularkeyboardthatisavailableforotherplatformsisSwype(thoughIampersonallywaitingforthereturnofPalm’sGraffiti),whichallowsmorefluid,one-handedtextentry.
ApplegroupedotherpossibleextensioncategoriesunderTodaywidgets(TodaybeinganewlyexpandedviewinNotificationCenteroniOSandMac),photoeditingenhancements(forexample,filtersfrompopularappslikeVSCOCam),documentprovidersforimportingfilesfrompopularsyncserviceslikeDropbox,andshareproviderslikethepre-existingbutsystemprovidedFacebooksharingfunctionality.Morebroadly,thevaguelynamedcustomactionsallowappstobeinteractiveevenwhenthescreenislocked,andfromwithinasmalldrop-downinterfacewhentheyreceivenotificationswhilethescreenisunlocked.
ThesecurityandprivacyconcernsthatApplehasaddressedforkeyboardsinparticulararehowinputsforpasswordfieldsandnetworkcommunicationarehandled,sothatakeyboardappcannotsendkeystrokesoverthenetworkandbecometheleastimposing-lookingkeylogger.Extensionsaredistributedinregularappbundlesandfollowcommonprivacyandsecuritycontrols.Inaddition,onemustexplicitlyallownetworktrafficforakeyboardinSettings,butevenApple’sownPredictiveTextkeyboardadd-oncannotentertextinadesignated(properlycoded)passwordfield.
TipNotethatmuchoftheAppleWatch’spreliminaryappfunctionalityisenabledviaextensionsandalltheprocessinghappensintheiPhone.ThesearethensenttothedeviceoverBluetoothLowEnergy.Verylittleisstoredaboutanapponthewatchitself(UIstoryboardsthatcancontaindynamicallyupdatingcontentlikewatchfaces),sosecuringtheiPhonewillbesufficient.
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SecuringwhatextensionscanaccessTheabilitytoenforcetheseexpandedprivacyandnetworkaccesscontrolswaspreparedbyhavinginterapplicationcommunication(undertheprotocolnameXPC)addedaspartofiOS5(andOSX10.7).ThespecificAPIsforthistypeofcommunicationensurethatappswillnotsharethesamefileormemoryspacewithanextension.
Essentially,bothpartiesstayintheirownsandboxbutXPCarbitratesandactsasaproxybetweenthem.IntermsofPrivacy,whileanyrightgrantedtotheextension’scontainerappwillbeinheritedbyit,anewappwillnotshareitsprivacysettingswithanotherdeveloper’sextensionthatisaccessiblewithinit.
WhilewewilldiscussMDMindepthlater,theiruseaddsthepotentialtoapplymoreon-the-flycontrols,whichincludelimitingthemailaccountsthroughwhichdatacanbesent,orthesharinganddocumentprovidersenabledonadevicethatdatacanbemovedto.AlotofthisalsodependsontheMDMactuallysupplyingtheapplications,butthisbecomesverypowerfulwhenpairedwithanin-houseapp.
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UsercontextTheoldUnixsecuritymodel,fromwhentheonlywayfortheaveragepersontouseacomputerwasbysharingtimeonamainframe,statedthatnobodywastrustedexceptthesystemadministrator.Whenonewasgivenastandarduseraccounttologin,therewasonlyalimitedrangeofthingsthatonecoulddotointroduceinstabilitytothesystem.iOSanditsprecursorOSXaredescendantsofNeXT,andBSDbeforethat.Thisputstheconceptofsystemprocessesrunningunderuseraccountswiththeirassociatedprivilegesintofocus.
iOSrunsappsonbehalfofastandarduseraccountnamedmobile,andunlikeOSX,itdoesn’thelptoenableanawarenessofmultipleusersonthesystem.WhenusinganiOSdevice,wedonotthinkabouttraditionaluseraccounts(thereisnointerfacetoaddmoreusers),asthedesignassumptionisthatthereisonlyoneownerofthishighlypersonalizeddeviceandtherefore,thereisonlyoneactualuser.Roleaccountsthatwouldrundaemonsonbehalfofthird-partyapplicationprocessesareabsent,aswhatisallowedtorunisstrictlylimitedoniOS(asitisonaMacnow;withthemanyrestrictionsthathavebeenimposedontheappsthatareallowedinitscorrespondingAppStore).
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SandboxingandAppdatastorageAswementionedinthebeginningofthechapter,acodesignatureisplacedontheappbundleitselfwithadditionalprotection,sothatthesignatureisverifiednotonlywhentheappisinstalled,butalsoatruntimewhentheappislaunched,tomakesurethatithasnotbeenmodifiedinthemeantime.Thisisforstabilityasmuchasitisforsecurity,sincecodethathasbeenmodifiedorallowedtorunroughshodonthesystemcancausethedevice,whichwemightjustwanttobeabletousetocall911inanemergency,tocrash.
Wespokeaboutamobileuserwhichwouldhaveahomefolder.UnlikethecommonconsumercomputerOS,thedatastoragelocationofanappisrandomlygeneratedandkeptseparatefromtheuser(besidesthecontainerizationofspecificpreferencesthathelpsharingamongadeveloper’sapps,sothosesettingspersistevenifanappisdeleted).Thereareframeworks,whichareshippedbyAppleinitsSDK,thatencouragestoringappdatainanencryptedformat.However,someexploitshaveusedanimpersonationofanapp’sbundleidentifiertomakeittrustworthytootherapplicationsthatwillbeabletoexchangedatawithit.Todate,forensicdeconstructionoftheseattemptshasfoundthatusersmustexplicitlyenablenon-standardbehaviorthroughseveralextenuatingcircumstancesforexploitstowork.Thepotentialfordataleakagehasnotbeensubstantialonnon-jailbrokendevices,butsecurityprofessionalsshouldbeawareofthisshortcomingwhereendusersareinvolvedintheinstallationofapps.
Plainfilestorageisnottheonlywayinwhichdataissegregatedandtreateddiscriminatelyonthesystem;otherprivacyordeviceusage-relatedpermissionsmustberequestedbyanappthroughentitlements.ThepreviouslyintroducedextensionscanbecontrastedwithAndroidintents,astheyarebothinitiatedbytheend-userandarefocusedfromthatperspective(althoughAndroidappstendtobroadcasttheircapabilitiestoreceivedatawithoutastrictorclearoversight,whichsomewouldargueisactuallybeneficialduetoaperceivedincreasesinproductivityandfunctionality).EntitlementsareonlyslightlydifferentfromWindowsphonecontracts,andApple’sstatedmodelmentionsthatappsshouldaskforasfewrightsaspossible,whichendusersshouldbe(asunobtrusivelyaspossible)promptedtoexplicitlygrantaccessfor,andeventhen,onlywhenitisabsolutelynecessaryforthefullusageofanapp’scapabilities.ThesearespecifiedintheapplicationbundleandcanbeinvestigatedwiththecodesignbinaryonaMac.
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Introductiontoin-houseAppdevelopmentSo,youhavefoundaneedtodeployacustomapptothedevicesinyourorganizationandhavereceivedthego-aheadtobuildone.AppleencouragesorganizationsandtheirdeveloperstosignupwithitsEnterpriseDeveloperProgramsothattheycanbegrantedthecapabilitytobuildanddistributecustom-builtappsoutsidetheAppStore.ManyITdepartmentshavealreadysignedupindividualstonotonlytestareleaseoftheoperatingsystem,butthetinkerersamongstuscanalsobuildopensourceappsforpersonaluse,whichcanalsobeachievedwithastandard,standalonedeveloperaccount.Youcanfindmoreinformationaboutthisathttps://developer.apple.com/enterprise/.
Theprocessoftyingtherequiredcertificatesandidentifiersforanapptothedesireddevicesfortestingisreferredtoasprovisioning.Creatingandmanagingprovisioningprofileswillnotalwaysbenecessary;however,itdependsonhowclosetoin-houseyouractualdevelopmentmaybe.WhenyouuseApple’sapprovalprocesstoclearanin-housedevelopedappforinternaluse,youwillmostoftenusetheBusinessVolumePurchaseprogramandleverageApple’sinfrastructuretodistributeit.Thisisbyfartheeasiestwayfromaprocurementandongoingsupportperspective,andthisisoftenthecaseforwhite-labeledappsthataremadebyprofessionalappdevelopmentcompanies.AppsintheBusiness-to-Business,VolumePurchaseappstorearenotvisibletothegeneralpublic,whichmayalsobebeneficialdependingonthesituation.
Adhocdistributionallowslimitedbetatestingonregistereddevices.ThisrequiresallthesamestepsthatanindividualwillperformtogetanappontheAppStore,includingregisteringasadeveloper,applyingtohavetheirappIDconsideredasunique,acquiringthecorrectcertificatessothatdevicestrusttheappwhenitisinstalled,andpreparingthebuiltapplicationfordeploymentonceallthementionedrequirementsarecomplete.Youwilladditionallyneedtogothroughtheprocessofbuildingateamentitytoidentifythedevelopersworkingonyourbehalfandgrantthemaccesstoyouraccountwhentheybuildtheapplications.Whenitcomestowidertestingwithmanydevices,ApplehasrecentlyacquiredanoutsideservicecalledTestFlightthatmakesthisprocesseasierforalargenumberoftesters,althoughanumberofothersolutionsstillexistoutsideofApplethatoptimizedifferentpartsofthetestingprocess.Youcanfindmoreinformationathttps://developer.apple.com/testflight/.
EnterprisedistributiondoesnotrequireeverydevicetoberegisteredwithApple,butitmustbedeliveredwithMDM.Therefore,itisrequiredtohavedirectaccessorsomecommunicationwiththefolkswhomanagethedevice,whethercompany-ownedorotherwise.OnepointtokeepinmindisthatdifferentMDMprovidersneeddifferentlevelsofinvolvementwhentheyareaskedtodistributeappsonyourbehalf.Theycanmakeyoushootyourselfinthefoot,sotospeak,byallowingamismatchoftheprovisioningprofileyouwoulduploadandtheassociatedappbundle,resultinginanappwithaprettyiconthatwon’tlaunch.OtherMDMsinsistondirectinteractionwithyourdevelopmentteamtoreducethepossibilityofissues.Keepinmindthatcertificatesareanintegralpartoftheprocessaswell;therefore,theyneedtoberenewedsothatapps
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SummaryInthischapter,wewentoverhowappsaredistributedandhowtheyprovetheirintegritytothesystemoncetheyareinstalled.WedemonstratedtheconceptoflockingadeviceintoanappwithGuidedAccess.Inter-app(anddevice)communicationviaextensionsandContinuitywasalsodiscussedalongwiththenewcomplimentaryprivacycontrolsforthingslikekeyboards.Asthischapterwasaboutthecustomizationandcontrolsyou’dwanttoplaceonapps,wegaveabriefintroductiontosecurelydistributingyourownin-houseapps.
SincethetimetheiPhonefirstcamealong,thewaymanypeopleinteractwithappshaschangedsignificantly.Limitedmethodsofinstallation,silosforcategoriesofdataandthecapabilitiesofapps,andthekeychainconceptfromOSXhaveallcometobearoniOS’overallsecurity.Youshouldnowhaveenoughbackgroundonhowappsfunctiontobegintounderstandwhythelimitationsarethewaytheyare,andwhattokeepinmindwhenyouaretaskedwithsecuringappdata.
Inthenextchapter,wewillcoverhowiOStakesadvantageofitshardwaretocreateasecureenvironmentevenbeforewegettorunanyapps,startingfromthemomentthedeviceisturnedon.
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Chapter3.EncryptingDevicesInthischapter,wewillbelookingatiOSdeviceencryption.Youmightthinkthiswouldbetheshortestchapter,asthefilesystemitselfhasbeenfullyencryptedformanyrevisionsoftheOS.Thismakeswipingthedevicewhengivingitawayorsellingitaveryquickprocess,asallyou’redoinginessenceisforgettingthemasterencryptionkeytounlockthealreadyscrambleddataandrenderingitirretrievable.Wearlevelingconcernsforflashstoragelikethosewhichareusedinmobiledevicesnowadaysmakesthispracticalforanotherreason,asscrubbingallblocks(orpages)onthestoragedeviceisnotnecessarytoensurethatthedataisunrecoverable.We’lllookintomoretopicsthanjustthedatabitsatrestthough,includingnetworktrafficandVPN.
Whileitmayseemconsumer-focused,wecannowusethesedevicesalongwithNFC(shortforNearFieldCommunication)forpayments,andconcernsoveremployerliabilityforidentitytheftonacompany-owneddevicecanraiseseriousconcerns.Securityprofessionalsmustbeevenmoreintouchwithwhattheircompany’spoliciesareonprotectingthecompany’sbestinterests,whilestillallowingenduserstobeproductiveandenjoyfulluseofthe“perk”thataniOSdevicemightprovide.LuckilymanyaspectsoftheiOSsecuritymodelallowustoletthedeviceroamuntethered,andwecaninformtheenduserhowmuchdatatheirdeviceexposeswhenitisusednormallyandforeverythingapolicydoesn’tcover.Privacyalsocomesintoplay,sowe’lltouchonthataswell.
Tobreakitdown,we’lldiscussthefollowingtopicsinthischapter:
RevisitingOSinitializationPassbookandTouchIDforApplePayIntroductiontoiOSnetworkcommunicationPrivacyconcernswiththeHealthApp,HIPAA,anddiagnosticsConfigurationProfileEncryption
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SecurebootandactivatingiOSInaconceptnotunlikethatofhowChromeOSensuresboththeintegrityofitsfirmwareandthatitskernelhasn’tbeentamperedwith,fieldupgradescansimilarlyproceedinasecuredfashionwithafeaturecalledverifiedboot.WhenaniOSdevicestartsup,itverifiesthekernelandtherestoftheread-onlyOSpartitiontoconfirmthatitmatchesaparticularsignature.TheprocesswouldbehaltedandthedevicewouldgobacktoDeviceFirmwareUpgrademodeorDFU(whichwouldalsobeaccompaniedbythe‘ConnecttoiTunes’screen)ifthemainOSpartitionisfoundtobenonfunctional.ThiscanalsobeinitiatedifawipeandreinstallisinterruptedwheninitiatedbyiTunes,AppleConfigurator,ortheuserthemselvesbygoingintotheGeneralsectionofSettingsandnavigatingtoReset|EraseAllContentandSettings.
Theprocessfromthetimeyoupoweronthedevicetowhenyoulandinuserspaceisreferredtoasthesecurebootchain.Alow-levelbootloaderperformsverificationtoconfirmwhethertheOSpartitionhasnotbeentamperedwith,andasawhole,whetherithasbeensignedbyApple.Ituseson-boardkeys(whichincludesarootkey,device-specifickey,andgroupkeytoestablishthechainoftrustforcryptographicoperations)thatareincludedinthefactoryattimeofmanufacture.Thislow-levelbootloaderprocessfinishes,andthen,theiBootprocessstarts,whichinturnstartstheOSkernel.
OncellulardevicesthatincludetheA7orgreaterAMDarchitectureprocessor(whichisinuseindevicessincetheiPhone5s),thereisaregionontheCPUthatisresponsibleforcryptographicoperationsandthisisreferredtoinmarketingastheSecureEnclave.Whileitisnotphysicallydistinct,thehighestimportanceisplacedonmakingitsfunctionalitylogicallywalledofffromtheprocessor’smainfunction.TheSecureEnclaveinteractswiththebootprocessbybeingcalledupontostartthecellularbasebandthroughaseparatebutsimilarsequence,whichisalsoresponsibleforcheckingthesystemsoftwareauthorization.
Specifically,uponreactivationthatisinitiatedbyamanualeraseoranOSrestore,avalidationprocessreferredtoasSystemSoftwareAuthorizationisperformed,whichrequiresInternetaccess.AcomputerrunningiTunesorAppleConfiguratorcanprovidethatconduit,orsinceiOS5anditsPCFreefeaturescamealong,youcanconnecttoaWi-Fiorcellularnetworktoactivatethedevice.AsdocumentedbyAppleforsometimeinitsiOSSecurity–WhitePaper,thereisaspecific,cryptographicallysecuredprocessthroughwhichanindividualdeviceidentifiesitselftoApplewhilerequestingactivationtocontinue.SinceAppleistheclearinghousethroughwhichdevicesareallowedtorunaspecificOSversion,previousOSeswithanyknownsecurityflawsaredisallowedfrombeingreappliedtoanupgradeddevicethatiscapableofrunningit.
Aswe’lldiscussinthenextchapter,restoringabackupcanskipthisactivationsteponsuperviseddevices,butthatisaconcernseparatefromtheOSitself.AdevicerunninganolderiOSversioncanthereforebeerasedwithoutupgradingit,assumingthatithasnotbeentamperedwithtofailverification.
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NotethatwhenanactivationisrequiredafteraniOSinstallationonacellular-capabledevice,aSIMcardmustbepresent.AppleusesthistogenerateavalidECIDtoidentifythedevice,soevenwhenthedeviceispreparedwithiTunesorAppleConfiguratorbuthasnoSIMcard,thiswillresultinanerrorandcauseittofail.
Onemayask,ofthemanydevicesstillbeingsoldbyApplewiththeolderprocessorarchitecture,howdoesitperformthecryptographicoperationsthatarenecessarytofunction?WhilethiswasnotpreviouslyoutlinedbyApple,acommontechniquethatisusedistogatherentropy(orunpredictableresults)fromthemanysensorsonthedevicesuchasitsgyroscope,accelerometer,orcompass.Theneedforrandomnumbersisobvioustoanyonewhoistryingtomakeasecuresystem,sincemanyimplementationsofakeygenerationprocessstartbygettingsomethingdistinctandsufficientlyrandomtobaseitsidentityon.
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PassbookandTouchIDforApplePayWebrieflytouchedonTouchIDinChapter1,iOSSecurityOverview,butmoreimplementationdetailsaroundtimeoutsandotherkey-relatedinteractionsarebetterdescribeApple’sowniOSSecurity–WhitePaper(astheygotogreatlengthstomakethingsasunderstandableaspossible).Atthetimeofwriting,themostrecentPDFwasfromOctober2014anditcanbefoundathttps://www.apple.com/privacy/docs/iOS_Security_Guide_Oct_2014.pdf.
AsTouchIDshouldstilljustbeconsideredanaddedconvenience,sufficientlycomplexpasscodesare,asalways,recommendedinallthingsthataresecurity-related.
TipIfyourcustomersorusersarelikeours,theywillforgettheirdevices’passcodesaftergettingusedtousingTouchID.Therefore,makesurethatyoudonotleaveyourcustomersinasituationwithoutMDMmanagement(orbackups,ifyourorganizationencouragesit),especiallyiftheActiveSync-based“failedpasswordattempt”limitisconfigured.Oncethethresholdisreached,itwillcausetheirdevicetobewiped.Thishappenswithoutadequatetimetogetassistancemoreoftenthanwewouldlike.
IntheWhitePapermentionedearlier,theimportanceandutilityoftheSecureEnclaveisdetailed.ItmayhavecomeintoexistenceinparttomaketheTouchIDfingerprintfunctionalityasquickandseamlessaspossible,sothattherewouldbenobottleneckfortherequiredcomputation.OnemaythinkfromApple’smarketingoftheSecureEnclavethatitisdedicatedhardware,butjustlikethejailingofpartsofthefilesystem,thisismostlyimplementedasatechniquetoensurethatthesoftwareoperationsarewhollydistinctandcannotruninthesamememoryorprocessorspacewhencarryingoutitsfunctions.
HowdoesthisrelatetoPassbook?Andhowdoesafeaturethatmostfolksuseforplanetickets(ifever)comeintoadiscussionaboutsecurity?Well,aswediscussedpreviously,identitytheftonacompany-owneddevicecouldaffectthecompanythatprovidesthedevicetotheemployee,asevidencedbynetworkequipmentandmailsystemsthatdetectdangerousbehaviorlikesocialsecuritynumbersbeingsentinplaintexte-mailcorrespondence.Withitsearlypopularityandprobablesuccessof,ApplePay,whichisApple’ssolutionforNFC-basedpaymentsakintoGoogleWallet,becameanattractivetarget.SincePassbookiswhereApplePaystoresthedetailsofitscreditanddebitcards,securingitisimportant.Luckily,thereareafewallowedvectorstogetintoPassbook,includingthemuch-malignedQRcode,andeventhen,thereislimitedfunctionalityonceapassisinstalled.
TipThePassbookapplicationhasabuilt-inscannerthatyoucanaccessbytappingonScanCodefromitssplashscreen,orbytappingtheplusbuttoninthetop-rightcorner(ifthere’sonlyonepass;otherwise,you’llseetheplusbuttonatthetop,anditcanbescrolledwheninthelistview).Thisisthesameprocessthroughwhichyouwouldaddpaymentcards.
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Forsecurityreasons,neitheradditionstorestheimagetotheCameraRollonthedevice.
APassbookpassandoneprocessbywhichpassesorcardscanbeadded
Amongotherrestrictions,youcannot,forinstance,haveanactivehyperlinkonthefrontofapass.Youcan,however,sendanotificationtoadevicewiththepassinstalled,andpushupdatestothepasssothatitwilldynamicallychangeitscontent.Passbookpasseswithanactivestate(suchastheleaduptoboardingaplane)canbeaccessedwhenthedeviceislocked,butupdatestoitcanoptionallybedisabledinthepassitself,orbothaccesstoandnotificationsforPassbookcanbedisabledintheTouchIDandPasscodesectionoftheSettingsapporviaamanagementsystem,alongthelinesoftherestrictionsthatwe’lldemonstrateinChapter5,MobileDeviceManagement.
TheattackvectorsforApplePayhaven’tbeenexercisedtothepointthatanyworkingproof-of-conceptshavebeendisclosed,butanotherquirkisthatapasscanrespondtolocationinformation.ThiscouldtriggerapushnotificationwhenitisintheproximityofaniBeacon,Apple’sbrandingforBluetoothlowenergytransmitters,whichcanachievesomethingalongthelinesofasupplementaltechnologytoGPS.WhileiBeaconsthemselvesdon’tcollectanyinformation,Passbookwillcontinuetoevolveasanareaofthephonetoremaininterestedin.NeitherNFC-basedApplePaynorPassbookisyetavailableontheiPad;however,in-apporbrowser-basedApplePaypurchasesworkwith
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thenewestiPadhardwarethathasTouchID.
Finally,oneothernoteaboutpurchasesonthedeviceisthatwhencheckingoutfromawebstore,itmay(whenthesiteisavalidHTTPSoneandcertainfieldsaredetectedwithintheform)triggeraprompttousethecameratotakeapictureofthecardthatyou’dliketomakethepurchasewithandfillinthedetectedinformation.
CardpaymentsystemsandfraudingeneralintheU.S.hasalwaysbeenasorespotwhencomparedtoothercountries,inparticularthingslikeATMtransactionsthatarethepoorestversionoftwo-factorauthentication:somethingyouhave(thephysicalcard)andsomethingyouknow(PIN).Whileit’snotparticularlyrelevanttousaswearenotasconcernedfromapaymentprocessingperspective,butthisseemstorequirethesameamountofvigilance.Theoretically,onecouldtakeaphotoofsomeoneelse’scard,andthroughacoordinatedattackinvolvingsocialengineering,useittoauthorizepurchases.Applecanpolicethisprocess,butasmanyconcernsasthereareaboutidentitytheftingeneral,therewillalwaysbethattradeoffbetweeneaseofuseandprotectingthesystemfromabuse.
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IntroductiontoiOSnetworkcommunicationWediscussedSafariandthepredictivesearchfeaturesthatareenabledbydefaultasthemostobviousnetworktraffic,besidese-mailandapplicationslikeTwitterandFacebookthatcanbeaccessedfrommoreplacesonthedeviceduetohavingaccountinformationbuiltintotheOS.Weather,Stocks,andSiri’sdataproviders,arealsoallowedtousethenetworkbydefaultalthoughyoucandisablejustcellularaccessgranularly.Speakingofwhich,dependingonthecarrier,swappingSIMcards(iftheslotisunlockedonthatparticularcellular-capableiOSmodel)canbeusedtosupplantinternationalroamingplansbyprovidinganumberthatislocaltothatplace,orevenjustthedataserviceasdesired.
Besidesthisgrabbagofoverarching,networking-relatedconcerns,we’llzoominonAirdropusingwiredconnectionsoniOS,VPN,proxying,andfiltering.
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AirDropApeer-to-peerwaytosharefilesondemandoveranadhocWi-FinetworkwithlittleornosetuphasbeenpresentintheMacOSforsometimeanditwasaddedtoiOS7.AirDropisthisfeature’sbrandinganditnowdoestheinitialdetectionofnearbydevicesbasedonBluetoothproximityandidentifiesinformationwithApple,againasthebackendclearinghousethroughwhichAppleIDidentitiesareprocessed.Thisaddsanonymitytotheprocessofcheckingwhetherweknowthepersontowhomwearesendingthefile,andcanpopulatetheroundiconrepresentingtheotherdevicewiththecontact’slocallyassignedimage.
AsofiOS8andOSX10.10,Yosemite,computerscanalsoperformthishandshakeandtransferofdata.Duetoitseaseofuseandlackofauthenticationbeforeallowingthesendingendtotransmit(amongotherreasons),manyITdepartmentsdisabledtheearlyimplementationsofAirDropontheMac.Multicasttrafficislessofanetwork-relatedconcernwhenitispeer-to-peerandrestrictedtoWi-Fi,butidentityverificationwithitsassociatedmetadataamongmanyothercryptographicprocessesthatdohitthenetwork,requiresasignificantamountoftrustinApple.
TipNotethatthisisoneofthebiggerissuesthatpeoplewithprivacyandsecurityconcernsexpressaboutvendorswhohavemadechoicessimilartoApple.ThisisalsocommonlydiscussedinrelationtotheiriMessageservice;partoftheconditionofusingtheserviceisthatyoumustimplicitlytrustthatAppleisproperlysecuringandrestrictingaccesstothekeysthattheparticipantsuse.
Dependingonthetypeoffilethatisbeingtransferred,compatibleapplicationsaredisplayedonthereceivingendtothentakeaction.ThefollowingscreenshotshowsadevicethathasreceivedafileoverAirDrop:
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Abugorafeature?WelongagomadetheassertionthatApplecheatsbybeingabletosynchronizeitssoftwarewithitsownhardware.AnothermaximofAppleITisthatingeneral,Appledoesn’tcareaboutthedevelopercommunity,Appledoesn’tcareaboutus.Theirprioritiescouldreasonablybearrangedasfollows:
ThecustomersThemselvesandtheirsideoftheoverlapbetweenpartnersandtheirplatformsLastly,anybodyelsewhowouldwishthemwellalongthewaytoimprovetheexperienceofthefirsttwo
Thisisnotnew,norshouldanyoneexpectthemtochangeinthelightoftheirsuccess.However,theysometimesmakeiteasierforallthepartiesinvolvedbyhavinganextensivelysharedcodebasebetweeniOSdevices.Thisincludesanotherproduct,theAppleTV,whichisoftenoverlookedordiscardedasnotaseriousendeavor,butwhichweinITgetasurprisebenefit:itincludesEthernetdriverstosupportitshardware,whichinturnispresentacrossalliOSinstallationseversinceitssmaller,hockeypuckformfactorwasintroduced.
Anunintentionalbitoffunctionalitythatwegainfromthisisthroughatechniquethatinvolvesthefollowingthings:
ApoweredUSBhubTheLightningtoUSBCameraAdapter(intendedtoconnectacamerawithaniOSdevicetoimportphotosintoiPhotoorotheriOSapplications)AnAppleUSBEthernetAdapter
ByconnectingtheLightningtoUSBCameraAdaptertotheupstreamportoftheUSBhubandtheEthernetAdapterinanydownstreamport,adeviceshouldbeabletousethisconfigurationtogetonthewirednetwork.Whilethispartofthenetworkingstackdoesn’tseemparticularlyoptimized,forensiccapturethroughmoretraditionalmeans(mirroringports,andsoon)ispossiblewithouttheinvolvementofanycomputer.(Wewill,however,coverApple’ssupportedprocessestoaccomplishiOSpackettracinginChapter6,DebuggingandConclusion.)AnillustrationofthissetupisdocumentedintermsofpasscoderemovalviaMDMathttps://www.afp548.com/2014/05/07/mdm-passcode-removal-from-an-offline-ios-device/.
TipCommonhumaninputdevicessuchasbarcodescannersorkeyboardscanbeusedwiththeLightningtoUSBCameraAdapterforeaseofinputandtheyareagreatwaytopreventfolksfromhavingtousetheirthumbsfordataentryenmasse.WhiletheiOSdevicemaybarkthattheaccessoryisnotsupported,youmayaddahiddenfunctionalityandsignificantlystreamlineinteractionsifallthehardwareiscompliantanditallgoeswell.
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VPN(Always-On,APN,Per-App,On-Demand)Sinceveryearlyon,youhavebeenabletoconfigureandinitiateaVPNconnectionintheSettingsofaniOSdevice,whichstartedwiththemoreprevalentgatewaysinuse(includingflavorsofCiscoIPSec,andtheraccoon-basedL2TPorPPTPprojectswhichOSXServerrelieson).Now,therearemorewaystotunneltrafficthanyoucanfigurativelyshakeametaphoricalstickat.AsthedemandtoenablemorefunctionalityoniOSiseverincreasing,ApplehasaddedsupportforRSASecurIDtwo-factortokensinthebuilt-inconfigurationsettingsaswell.
Aswithothercomplexsettings,youcouldalsouseaconfigurationprofiletosimplifythesetupforendusers,whichwewilltouchoninChapter5,MobileDeviceManagement.
Anewerfeature,alsoavailableforusewhenconfiguredwithaprofileormanually,istheabilitytolockthedeviceintotunnelingallitstrafficthroughaVPNtunnelwithanAlwaysOnconfiguration.ThisisexposedtoenduserswithaSendAllTrafficsliderwhenoptional.ForittobemanagedsothatitislockedintotheONposition,theappropriateconfigurationprofileneedstobeinplaceandthedeviceneedstobeinastatecalledSupervision,whichwewilldescribeindetailinthenextchapter.
ThefollowingscreenshotshowsaVPNconnection,withoptionsforRSASecurID,SendAllTraffic,andsoon:
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AVPNconnectionwithoptionsforRSASecurIDtokensandSendAllTraffic
Anolder,moreobscuremethodofsecuringdataserviceaccesswiththecooperationofyourcellularproviderisviaanAccessPointNameconfiguration,butit’snotsomethingthattheauthorsofthisbookcomeacrossveryoftenanymoreintherealworld.YoumayforgivethecomparisonofAPNtoanextensionofthecorporateLAN,althoughwiththepopularityandtoolsetaroundVPNsbecomingsocommonplace,it’sunderstandablethatthiscellular-onlytechniquewouldfallbythewayside.
WhenpairedwithpropercertificatesandaconfigurationprofiletodefinethedomainsthatrequireaVPNconnection,VPNOnDemandenableson-the-flyconnectionstobemadewhenadevicetriestoconnecttoagivendomain.Manyelaboratechecksarealsopossibleonanetworkstatechange,includingSSID,reachableserverdetection,andDNSserversettingssothatOnDemandcanbeturnedoffwhenit’s‘on-network’.Thisisespeciallyusefulinsplit-domainDNSconfigurations.
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Per-Appisbyfarthemostattractiveapp,aswhenanorganizationhasprovidedanapptheycommonlyalsowanttosecureallthetrafficthattheappwillgenerate.Asalways,however,thedevilisinthedetails.AfewVPNgatewaysandfewerappsaresettoenablethisbehavior.Organizationsmayfindanyofthemoreadvancedimplementationstricky,asyouneedamoresophisticatedgatewaysetupwithcompatiblehardwareandsoftware,whichcanalsorequiresignificantpreparationfromacertificateinfrastructureperspective.
ThemostsimpleandpossiblyhardesttomanagearethespecificappsontheAppStorefromVPNgatewayvendors,someofwhichmerelyembedawebbrowserthatallowsyoutoconnecttositesonaremotenetworkoncetheconnectionisestablished.
Otherwise,youcanjustbuildallyourworkflowsintoanappsuchasGood,enablesorwrapthemintoacontainerappthatdoesallthenetworktrafficandbusinessinteractionsforyou.Evenmoreattractiveissecuringthetransportanddataatrestwheninteractingwithyourorganization’sapplicationsandsidesteppingallofthistomfoolery.ConjuretomindthememeofthecharacterBoromirfromTheLordoftheRingssayingthatonedoesnotsimplywalkintoMordor,thetwistbeingthatonedoesnotsimplytrustanyclientaccessingyourdatatobeproperlysecuredeveniftheyhaveprovidedvalidcredentials.Butwecanonlygosocrazyuntilitbecomesprohibitivetorestrictaccessthatfolksneedtodotheirjobs.
GlobalHTTPProxy,caching,andthewebcontentfilterDuetoconcernsoverandregulationofthenetworktrafficofiOSdevicesinschoolenvironments,ApplestartedwithaGlobalHTTPProxyfeaturetoenablethecachingandproxyingoftraffic,withtheadditionalbenefitofworkingoff-campusandoncellulardevices.Vendorsthatspecializeinensuringtheuptimeoftheservice’sgatewayareimportanttopartnerwith,andcommonlynetworksecurityapplianceshavetakenonthisroleamongtheirotherservices.AsthisisonlyHTTP,itdoesn’taddressmanymandatedregulationsforprotectingstudentsincertainjurisdictions,butitwasastartatalleviatingsomenetworkinspectionandcachingneeds.
AppleincludedaCachingServiceinthe2.2releaseofitsServerapplication,whichisdistributedasanadd-ontoregularOSX.YoucansetthisupandcachecontentforaNAT’slocalnetworkinordertoimproveperformanceduringOSupdatesorwhenotherfrequentlyaccesseddataisrequestedbymanydevices.Wedonotgetmanyfeatureswiththissolutionthough,asyoucannotpoisonthecachetoensurethatcertainapplicationsorcontentaremadeunavailableonyournetwork.SomehaveresortedtohijackingDNSrequestsonport80tomesu.apple.com,forexample,sothatOSupdatescannottakeplacewhileon-network.OthercontentthatisenabledbydefaultwiththisserviceisiTunes,iOSAppStore,MacAppStore,andiBooksStorepurchasesalongwithMacandiOSUpdates.
Thisisall,ofcourse,onlyHTTPanditismoreaboutrelievingnetworkloadthanlimitingthetypeofcontentthatisaccessibleonthedevices.OnlyrecentlydidAppleaddtheabilitytosubscribetocontentfilterupdatesforHTTPSsites,orgranularlywhitelistorblacklistsites.Asdiscussedearlier,areliablepartnerwhounderstandsyourorganization’spoliciesiscriticaltoimplementafilterthatdoesn’tbecomeahindranceorablocktoyourcustomers’productivity.
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AsdiscussedwiththelockingofAlwaysOnVPNsettings,devicesmustbeinthesupervisedstatetouseeitherGlobalHTTPProxyorthewebcontentfilter.(Thismakessenseasasuperviseddevicecanhavesettingslockedthatenduserscannotdisableatwill.)
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Privacy-relatedconcernsJustasearlierwhenwediscussedApplePay,youmayfinditoddtoseeasectiononprivacy,butaswesaid,thesedayswithidentitytheftandotherwayscustomerscanleakdatathroughsocialengineering,theconcernsfororganizationsaremorepressing.Practicallyspeaking,it’sjustalotofoverheadwhendirectoryharvestattackscatchtheless-astuteemployeeswhofallfortricksthatcausethemtohandovertheircredentials,andthenadministratorsneedtogothroughtheprocessoflockingthemoutandfixingtheirmailboxes.
TipAdministrativeoverheadistheleastoftheconcernsforlarger,well-knowninternetcompaniesthatwouldbeveryembarrassed,attheveryleast,iftheiremployeeswerephishedorwereclumsywiththeircredentials.Itbecamepublicthatonecompanyinparticularhaddeployedaplug-intothewebbrowserthattheydevelopedwhosepurposewastodetectwhennetworkcredentialswerebeingenteredinaninsecureorbogusform,therebyeffectivelypreventingthatmethodofexposure.TheMacadmincommunitygetsalotoftheirideasandbestpracticesfromthiscompany,whichrhymeswith“froogle”.
Justasthereareregulationsaroundprocessingcreditcards—themostcommonlyknownisPCI(shortforthePaymentCardIndustry)SecurityStandardsCouncil—therearehealthcareindustrystandardsaroundprivacywhichareincludedaspartofHIPAA(ortheHealthInsurancePortabilityandAccountabilityAct).Partofthisstatuteclassifiescertainpiecesofhealth-relatedinformationtobeprotected,whichincludesasurprisinglybroadrangeofdata—evensomethingassimpleasnames,whenattachedtodatainaparticularcontextbecomesensitiveandimportanttocontrolaccessto.
We’llcovertwoexamplesofnewwaysthedataiscollectedoniOSdevices(andtheiPhoneinparticular)todemonstratehowthisisaconstantlyevolvingtopicthatrequiresappropriateattentionbasedonyourdealingswiththehealthcareindustry.Evencollegesaretryingtoreducetheriskoflawsuitsduetoinformationinstudentrecordsgettingintothewronghands,sohopefullyyoucanworkwiththepolicymakersatyourinstitutiontocraftappropriatepolicies.
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Lesser-knownwaysforAppletogatherdiagnosticsFirst,youmaynotrealizehoweasyitisforAppletobeinvitedintothegoings-onoftheirdevices.JustrecentlywecameacrossaniOSdevicethatneededtobeserviced.IfyougotoApple’ssiteandsaythatyouwouldliketosetupaGeniusBar,in-storetechnicalsupportappointment,theycanpromptyoutosendinidentificationanddiagnosticdatarightthereonthespot(presumablytodeliverabetter,moreefficientexperience).Further,toproveownershipoverthephone,ApplecansendapushnotificationwithaPINtoadeviceloggedintotheiCloudaccountifyouprovideotheridentificationinformationaboutthedevice.
Now,inthescenariothatwejustdescribedforcollectingidentificationanddiagnosticdata,youmaythinkthattherewouldbeahighbartohaveaccesstothemechanismthatcollectsthisdata.However,thereareself-servicingorganizationstatusesthatcanbegrantedtolargecompaniesandinstitutionsthatdonotwanttogetservicethroughthird-partyserviceprovidersortheAppleStore’sGeniusBar.Whileimprovingtherepairexperienceforthecustomersofanorganization,thedevicesthatdiagnosticscanberunonarenot,toourknowledge,limitedtotheonespurchasedbytheorganization.
Onewouldthinkthebindingagreementsplacedonthosewithaccesstoself-serviceorganizationstatusthroughaserviceprovidedbyApplecalledGlobalServiceExchangewouldpreventfoulplay.Throughconversationswiththosewhodohaveaccesstothesediagnostics,wecanreportthattherearelittledifferencesinwhatcanbeseenindiagnosticlogsonthedevice.Thisservicehasabitmorehardwarerepair-relatedinformationthatwouldbehelpfulforparticipatinginrecallorwarrantyupgradeprogramsthatAppleisforcedtodofromtimetotime.Forexample,inthecaseofcertainmodelsofiPhone5,therewasaknownissuewherethehomebuttonlostfunctionalityafterbeinginuseforacertainperiodoftime,whichwasthereforemadeeligibleforexchange.
AswewilldrivehomeinChapter6,DebuggingandConclusionregardingtheattackvectorsadeviceisexposedtooncepairingtoacomputerisallowed,onemayconsiderthisanacceptabletrade-offforabetterexperiencewhentheaverageconsumerneedstheirdevicefixed.Thedatagatheredandcollectableislimited,butApplewillcontinuetodancethislinebetweenthingslikenotshowingtheirthird-partydevelopersmuchinthewayoffeedbackfromcustomers,topreventingtoomuchexposurelikethewell-publicizeddeletionofthedevicesofaprominentjournalistforWiredwhoseiCloudaccountwashackedinto.
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HealthappAnotherclassofdatathatmanywouldconsiderprivateistheiractivity.iOS8introducedframeworkstohelpthevarioushealthcarecompaniesthatdevelophardwareaccessoriestointeractwithhealthdata.
NoteGlaringlymissingatlaunch,however,wasaclassofperiodtrackingdataforwomen.Asthird-partyiOSappshavebeenbuilttotrackthisfromthebeginningoftheexistenceoftheAppStore,withrecentstandoutscoveringnarrowly-targetedtasksrelatingtobreastfeeding,thisisratherodd.Developerscouldn’tevensubmitappsleveragingtheframeworkuntilseveralrevisionsofiOS8,andstill,NikeFuelisanotablethird-partythatisabletoleverageitsdatawithanamedinclusionintheHealthapp.
AsofthelaunchoftheiPhone5s,asensorwhichfunctionsasapedometerisincludedinalliPhones.Apple’smarketingteambrandedthehardwarethatmanagesthecachingandprocessingofhealthsensor-specificdatatheM7motioncoprocessor,withversionnumberinginsyncwithitsin-houseARMlineofprocessors,whichiscurrentlyA8.Thisremovestheneedforasmanyexternalsensorsondevices,likethoseleftoutofthedesignoftheAppleWatch(thatwasproposedatthetimeofwriting).Additionally,asoftheHealthappbundledwithiOS8,stepandrunningdataistrackedanddisplayedbydefault,whetheryouexplicitlyenableitornot.
YoucanseethiscombinationofGPSandaccelerometersensorsinactionforyourselfbynoticingthestepdataloggedintheHealthappwithoutanyopt-inonyourpart.Thereare,infact,nosettingsfortheappwhatsoever.Onlyprivacysettingscanbemanagedtodisallowappsthathaverequestedaccesstothewarehouseofdatastoredwithin,whetherthephone’sownsensorsloggeditoranaccessorywastheoriginalsource.Inthefollowingscreenshot,youwillgettoseeautomaticallyloggedstepanddistancedata:
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Automaticallyloggedstepanddistancedata
Oneotherthingthatyoucaninteractwithcouldbeapotentialsourceofinformationleakage,butisimplementedasanopt-infeature:an“incaseofemergency”function.
NoteAstoryfromapopularsitebyDavePelltitled‘MyHeadisintheCloud’recountshowhisbabysitterdoesn’thaveherboyfriend’scellphonenumbermemorized,andwhenshewasinjuredandhercellphonewaswrecked,theyhadnowaytocontacthim.It’sasifthisfeaturewasdesignedwiththisscenario(minusthedestroyedphone)inmind.
YoucanaddyourinformationseparatelytowhatisthenaccessiblebyappsthattieintotheHealthapp(andtheHealthKitframeworktherein)sothatfromthelockscreen’semergencycallfunction(whichhasbeentheresincethefirstiPhone,asfederally
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mandatedintheUS)therewillbeanewtextlabelinthelowerleft-handcorner:MedicalID.Thefollowingscreenshotshowsthescreenthatshowstheinformationtoaidfirstrespondersincaseofemergencies:
Informationtoaidfirstrespondersincaseofemergencies
Thistellssomevitalstatistics,andmostimportantly,incasethephone’sownerisunabletocommunicate,whomtocontact(ortobecompletelymaudlin,thenextofkin)withahandycallbuttonnexttoitsothattheyaremorelikelytopickupthecall.
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ConfigurationprofilesIfyouhaveanyfamiliaritywithhowOSXstoresitsconfigurationfiles,itwouldnotbetoomuchofasurprisetohearthataprofilethatwasimplementedforiOSmanagementisalsoaspecificflavorofXML.InsteadofacentralregistrylikeyouhaveonWindows,there’sdifferent,oftengranularlysetfilesor(oftensqlite3)databaseswithwhichanapplicationortheoperatingenvironmentitselfiscustomized.However,thisisnotasimportantastheframeworkwithwhichchangesareenforcedonthesystem,andso,atripbacktoOSXwouldactuallybeuseful,asthatwaswhatinspiredmuchofthearchitectureofiOS.
Withoutmanagement,changescanstillbeappliedbytouchingkey-valuepairsintheseXMLfilesinwhatarecalledpreferencedomains.Thefilesthemselvesarereferredtoaspropertylistsandcarrythe.plistfileextension.Acommonbinaryusedtointeractwiththese.plistfilesatthecommandlineisthedefaultscommand,althoughsystemframeworksareexposedtoscriptinglanguagestodirectlyinteractwiththeunderlyingAPI.
Aswithatraditionaldirectoryservice,however,settingscanbeinheritedfromanetwork-basedcentraldatabase,thepayloadforwhichonWindowsiscommonlygrouppolicyobjectsorGPOs.MacshaveaframeworkthatisreferredtoasManagedClientforOSXorMCX.ByapplyingMCXsettingstoacomputerorcomputergroup,theywouldallhavethesamesettingsenforcednomatterwhousedthedevice,butuserorgroup-levelsettingswoulddependuponwho’sloggedin.Justaswithnon-networkawarepreferencedomains,MCX-enforcedpropertylistfilesarestorednearthelocaluserandgroupdatabaseonthefilesystem,whereitiscachedtomaintainthesettingsoffnetwork.Adminuserscouldoptionallyoverrideanysettingswhenloggingin,forquicktroubleshootingofconfigurations.
InsteadofMCXasthedeliverymethod,profilescametotheMacasanadditionalwaytomanagesettingsinOSX10.7andbecamemorepowerful;now,aconfigurationprofilecanaffectchangesthatMCXhadnotpreviouslybeenabletosuchasnetworking-relatedsettingsamongothers.TheideawastogobacktotheMacandallowmanagementsystemstousethesameformat,XMLfileswiththemobileconfigextension,inmanycasesapplyingthesamesettings.So,torecap,configurationscanbesetontheMacthroughthefollowingways:
Simple.plistfilesresidingatthesamelocationwherethey’dbefoundinadefaultinstallationandcanbeinteractedwithviathedefaultscommandThe.plistfileswithspecificMCXstanzas,whichwasthepreviouswayinwhichyoucouldimplementmanagementfromacentraluser/group/computerdatabaselikeLDAPConfigurationprofiles,whichisthenewer,cross-platform(betweeniOSandMac)methodofapplyingmanagementsettings
Withconfigurationprofiles,justlikeMCX,youcangroupcomputersandusersormanagethemindividually.AswewilldemonstrateinChapter5,MobileDeviceManagement,the
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terminologyusedwiththeServerapplication’sProfileManagerserviceistouseadevicetorefertoaniOSdeviceoraMac,andyoucaneveninheritusersandgroupsfromActiveDirectory.ThedevicelevelofmanagementwithinaprofileiscalledtheSystemscope,whereasanythingthatwouldapplygranularlytoaUseriscalledjustthat.ThefollowingscreenshotshowsanexampleofanApple-flavoredXMLfile,withtheSystemPayloadscope,whichmeansthatitwilltakeeffectdevice-wide,insteadofbeingscopedtoaparticularuser:
AnexampleofanApple-flavoredXMLfile,withtheSystemPayloadscope,meaningitistotakeeffectdevice-wideinsteadofbeingscopedtoaparticularuser
NoticethattheDOCTYPEintheprecedingscreenshotspecificallycallsoutApple,andsettingsarestructuredwithnoparticularorderingsinceithasahashordict(shortfordictionary)asthebasetype.Thefollowingscreenshothasmoredetailsonthis802.1x-specificconfiguration:
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AWi-Ficonfigurationprofile,whichwouldtelltheradiuscontrollerthatActiveDirectorycredentialswillbeusedfor802.1xauthentication
Thereis,however,noconceptofbindinganiOSdevicetoadirectoryservice,norofdifferentusershavingcustomizedsettings,whereasMacscantakebothintoaccount.ProductsevenexisttomanagesettingsforMacswithinthesameinterfaceasGPOforPCs.ForiOSthough,theMDMserviceitselfneedstobeawareofthegroupingsandmanagementsettingswhichitcanthenactupontohanddownconfigurationstodevices.ThisisincontrasttoMacs,whichcanevenbetoldtoprovideauthenticationtoradiuscontrollersoverWi-FiwithActiveDirectorycredentialsattheloginwindow,asshownintheprecedingscreenshot.IfyoudeployedtheprofilepicturedpreviouslytoaniOSdevice,itmayverywellignoretheunusedoptionsorfailaltogether.
Nowthatwehaveseenmoreabouttheformatandhowit’sscopedtodevices,let’slookintothehistoryofthismanagementformat.Apple’scanonicalreferenceofaninterfacewithwhichtoconstructthesettingsavailableformanagingiOSdevicesfirstappearedinatoolforWindowsandMaccallediPhoneConfigurationUtility(oriPCUforshort,whichmakesitsoundlikeoneofthoseplacesyoucangetanassociate’sdegreeontheinternet).ItwasoriginallyreleasedbackwhentheOSwascallediPhoneOS2.(Really,itwasOS/2Warp.NowthatwasanOS!)Whenconstructingaconfigurationprofile,youwouldseemanagementoptionsgroupedintosectionsinasidebarontheleft,andyouwouldinteractwithvariousfieldsontheright.Thefollowingscreenshotshowstheconfigurationprofilecreation/editingintheiPCUinterface:
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Configurationprofilecreation/editingintheiPCUinterface
Youcouldevenviewlogs(unlikethemerediagnosticreportswedidearlier),whichcameinhandywhileyouappliedaprofiletoseewherethingswentoffthetrackwhenaconfigurationwasn’tvalid.Thefollowingscreenshotshowstheloggedoutput(essentiallysyslogoutputinaconsolerunningonthedevice)displayedwhileapplyingaprofile:
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Loggedoutput(essentiallysyslogoutputinaconsolerunningonthedevice)displayedwhileapplyingaprofile
iPCUhasbeendiscontinued.ItcannolongerviewlogsoniOS8devicesanditisnolongeravailabletodownloadforWindowsorMac.Thisisprobablyagoodthingasithadn’tbeenupdatedsinceiOS6.ItlaunchedtheinterfaceparadigmformanyconfigurationprofileinterfacesandnoAppletoolhasyetreplacedtheease-of-useofitsconsolefeature.SeeChapter6,DebuggingandConclusion,fordetailsonlibimobiledevice,whichmayhaveasimilarfunctionality.
TipForessentiallyopeningaconsoleonaniOSdeviceandviewinglogs(aslongasthedevicehasbeenpaired),oneofourexcellenttechnicalreviewers,JeremyAgostino,recommendsiOSConsole,whichisavailableathttp://lemonjar.com/iosconsole.
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Signing,encryption,anddeliveryWhenaproperlyconfiguredandsecureMDMpushesaconfigurationprofiletoadevice,itwillbesignedasanypieceofcodeshouldbethatwantstoproveitsidentityandbetrustedbydevices.Itshouldalsoencryptitspayloadtoprotectanysensitivedatacontainedwithin.However,theusualdeliverymethod,pulledover-the-airbythedeviceoncetoldtocheckinbyApple’sPushNotificationService,isnottheonlytransportmechanism.
WheniPCUwastheonlywaytoconstructaprofile,youcouldeitherapplyitlocallyoverUSB,oryoucoulduseoneofthefollowingoptions:
E-mailittoeachapplicabledevicebywayoftheassociatedenduserPutitonaproperlyconfiguredwebserver(whichwouldtreatthemimetypeaccordinglyforaccessfrommobilesafariondevices)Senditbyatextmessage(remember,thispredatediMessage)
Now,thereareafewothertoolsthatcanapplyaprofiletoadevice,butotherwise,thenon-MDMdeliverymechanismsareunchanged.
Tobreakdowntheformatofconfigurationprofilesthatareavailable,youcanleavetheprofileinplaintextwithnosignatureandedititatwill.Thismayberejectedorjustnotappliediffolksrefusetocontinueafterbeingpresentedwithwarningpromptswhenaskedtoinstallit.
Youcouldsignbutnotencrypttheprofile,leavingthepayloadandothercontentsabletobeinspectedinplaintext.Abarelyrecognizabletextblobwouldprecedeandclosetheprofile’smaintext,whichisitssignature,ensuringthatitwasnottamperedwith.Ifitwasalteredaftersigning,anysubsequentinstallationswouldberefused.
Finally,theentireprofilecouldbeencrypted,makingitrelyonaworking,compatiblePKIrelationshipthatisnormallybasedonaRemoteManagementprofilebeinginstalledonthedevice,whichanMDMservicewouldputonatenrollmenttime.
NoteConfigurationprofilesignaturesusetheCryptographicMessageSyntax(CMS)standard.Whilenotexactlysimple,onecoulduseopensslonvariousoperatingsystemsintandemwitharootcertificatefromatrustedcertificateauthoritytoapplysignaturestoconfigurationprofiles,whichdeviceswillthenseeastrusted.
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SummaryThischapterwasabitofagrabbagofthemorefundamentalconceptsofhowthedevicehandlesencryption.InsteadofbeingacompletederivativeofApple’siOSSecurityWhitePaper,wepresentedthenewerquirksandreal-worldapplicationofsomeofthetopicsaroundencryptingthemainfunctionsofthedevice.Wediscussedhowthesystemispreparedatthefactorywithsecurityinmindthroughitssecurebootprocess.TheadditionofNFCpaymentsviaApplePayledustoinvestigatePassbookanditsintegrationwithTouchID.Networking-relatedconcernslikeVPN,AirDrop,Proxies,andFilterswerealsodiscussedalongwithawayofutilizingawirednetworkconnection.TheHealthappandMedicalIDweretouredbriefly.Finally,wepreparedforapplyingmanagementbydetailingwhattheactualfilesandformatsarethatmanagesettingsonbothiOSandMac.
BringYourOwnDevice(BYOD)programsoftenoverlapwithhowregularconsumerswanttousewhatis,infact,theirdevice.Whilekeepingthatinmind,asprofessionalsweneedtobalancecontroloverourdatawithtakingfulladvantageoftheutilityofthedevice.Hopefully,thisalsogetsyouthinkingaboutprivacyasatopicthatgoeshand-in-handwithsecurity,andlaysthegroundworkfortheapplicationofmanagementsettingstobringaboutproductivityinemployees,whichwe’llbecoveringoverthenexttwochapters.
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Chapter4.OrganizationalControlsNow,we’llmoveontoexploretheconceptsinvolvedinmanagingiOSdevicesfromacentrallocationon-premises.Thisincludesdevicesupervision,ActivationLock,SingleAppMode,andmorebasicoptionspresentedbytheoldstalwart,ActiveSync.Formostofthetime,wewillbelookingatatoolcalledAppleConfiguratorthatisdevelopedbyApple.Weconsiderittobeoneoftheeasiesttoolstorecommendforenvironmentsthatneedmorehands-oncontrolwhenofficiallysupportingiOS,eitherwhenmigratingtoaBYOD(shortformforbringyourowndevice)environmentorinconjunctionwithanMDM.Itfitsacoupleofspecificworkflowsverywellandhassomefeaturesthatarevitalforhardeningdevices.
BesidesAppleConfigurator,whichattheveryleastcanprovideagoodreferenceforshowingApple’sacknowledgedusecasesforstartingwithdevicemanagement,wewillalsointroduceApple’sDeviceEnrollmentProgramorDEP.ActivationLockisathorniertopicnow,sowe’lltouchonthisaswell.JusttotransitionfromGuidedAccess,whichwascoveredinChapter2,IntroducingAppSecurity,we’llalsodiscussAppLockwhenweexplainthedifferencebetweenitinteractingwithGuidedAccessandSingleAppMode.And,beforewegetintofull-blownMDMinthefollowingchapter,wewilldiscussActiveSyncasoneoftheoriginalover-the-airmanagementframeworks.
Inbrief,thischapter’stopicsareasfollows:
AppleConfiguratorPreparation,supervision,andassignmentofiOSdevicesThedistributionofappswithAppleConfiguratorandtheVolumePurchaseProgramActivationLockandFindMyiPhoneTheDeviceEnrollmentProgramversusAppleConfiguratorAppLockandSingleAppModeincontrasttoGuidedAccessRefresheronwhatActiveSyncprovidesoniOS
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AppleConfiguratorBeforethereleaseofAppleConfiguratorontheMacAppStore,therewerethreeothersanctionedapplicationsforinteractionwithiOSdevices:iTunes,Xcode,andiPhoneConfigurationUtility(iPCU).Xcodehadthecapabilitytoconnectmultipledevicessimultaneously,buteventhatfunctionalitywaslimitedforrunningtestsondevicesorforrestoringaversionofiOS.Still,wewerewithoutanyconceptofefficient,directlyconnectedmanagementtools,noreventhehintofintegrationwithadirectoryservice.
WhentheiPadwasreleased,itdidnotcomewithamanuallikealawnmower,whichshowsyouwhatitsintendedusageisandhowtosharpentheblades.Applejustaboutsaidthesamethingtoitscustomersthatitsaystoitsdevelopers,somethingtotheeffectof“wecan’twaittoseewhatYOUdowithit”,asifitwasstillanopenquestionastowhatitsmostpopularusewouldbe.Appleproductshave,however,historicallybeenusedextensivelyineducationandthepricewascommonlyahalftoathirdoftheleastexpensivelaptopMac.ThisledtoaninfluxofiPadsinenvironmentsthatmightnothavebeenparticularlypreparedtohavesomanycomputingdevicesonWi-Fi.Thisleadsusbacktothelackofapplicationsthatallowtetheredpreparationandmaintenanceofmanydevicesatonce.
Perhaps,ifcustomersthatusedAppleproductsforeducationalpurposesinparticularwereaskedwhattheywanted,astheparaphrasedsayingattributedtoHenryFordgoes,theywouldhavesaidafasterhorse;insteadtheygotAppleConfigurator.Wedonotwanttoberepetitive,butwemustrecallthatApple’sprioritiesareitscustomersfirstandforemost,andtheysellanastoundingamountofproductstoregularconsumers.Onemaybeinclinedtocutthem,andcompanieslikeAmazonwhoaresellingtothegeneralpublicwithsuccess,someslack,whichishard.Amazon’snottryingtobeCDWandApplecan’tbeeverythingtoeveryone;(althoughithasneverstoppedthesprawlofiTunes,whichtheAppleTVAssistantbuiltintoAppleConfiguratorwhichhasafaintwhiffof.)
BackinChapter2,IntroducingAppSecurity,wementionedabouttheVolumePurchaseProgram(VPP)thatAppleoffers.ThiswasanintegralpartofwhatwasconsideredgoingintodesigningAppleConfigurator,alongwiththeSupervisionconceptthatwe’vebeenhintingatthroughoutthebooksofar.However,beforewegetintothat,let’sdiscussworkflows.
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IntendedworkflowsOfalltheiOSformfactors,at9.6”,theoriginalandcanonicaliPadscreeniscomparablysizedto8.5”x11”oranA4sheetofpaper,ifyoulosethemarginsandenjoyedstaringatalightbulballthetime.(What?youdon’tpreferemissivescreens?)Ifatelecomfieldworkerhasvisitedyourhomeorbusinessrecently,youmighthavenoticedthattheynowalmostexclusivelyusetablets.Similarly,airlineshavebeengivingtheirstaffhandhelddevicesforsometime.Whentakingthisrapidadoptionofmobiledevicesintoaccount,andrecallingwhoAppleusuallycaresaboutwhendesigningsolutions,itmaymakemoresenseastohowAppleConfiguratorcameintobeing.
AniPadcanconceivablyreplaceautilityworker’sclipboardorastudent’sthree-ringbindersandstreamlineprocessesalongtheway.AirlinepilotsbegandemandingiPadstoreplacetheirungainlyandheavybindersofairportandroutemaps,whichactuallysavedfuelduetothedropinweight.Wecanstarttoseethatdeviceswillbeusedinamultitudeofways,butaparticularlyaptcaseishigh-serviceandquick-turnaroundenvironments,loadedwiththeappsanddatapeopleneedtogettheirworkdone.
AppleConfigurator’sreleasewasgroundbreakinginthatitwasaseriesoffirsts:
ApplicationscouldbehandedoutinbulkwithoutMDM,andtheseappscouldthenbereclaimedBackupscouldbecreatedandrestoredwithoutiTunesandrestoredorrefreshedenmasseNew,morelocked-downrestrictionscouldbeenabled
Educationalinstitutionssegmenttimeintoclassesandtheyoftengatherdevicesinlabsorcarts.Hospitalsandutilityworkershaveshiftsandcanmakeastationaroundatimeclockoragatheringplacefordevices,fromwheretheycanbecheckedinandoutfrom.ItiswidelyreportedthatAppledoesnothaveacolossalR&Dfootprint,sowhentheymakeatooltheyhavetopleaseasmanyendusersaspossible.Theydon’thavetheresourcestoqualityassureanddevelopfeaturesthatcanserveeverymarket.PleasekeepallofthisinmindaswediscusswhatAppleConfiguratorcando,withatleastanunderstandingofwhyitdoesn’tmakeFrenchfriesfourdifferentways.
ThefollowingscreenshotshowsthesplashscreenonstartingAppleConfiguratorforthefirsttime,whichgraphicallyintroducesitsthreemodes:
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ThesplashscreenonstartingAppleConfiguratorforthefirsttimegraphicallyintroducesitsthreemodes
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Theinteractionmodes–Prepare,Supervise,andAssignAfteracquiringAppleConfiguratorfromtheMacAppStore(itisfree,butrequiresaMacatthistime),you’regreetedwithanimagethatbreaksdownitsthreecumulativemodesofoperation.First,therearethecapabilitiesofthePreparemode,whichareasfollows:
Namingthedevice(thisincludestheoptionofsequential,numericnamingifyouarepreparingmultipledevicesatonce,asitcanhandleupto30devicesconcurrently)Creatinga(unsupervised)backupApplyingasoftwareupdate(whichcachesthatversion)andoptionally,wipingthedeviceintheprocessImporting,creating,exportingand/orapplyingconfigurationprofiles
Finally,flippingaswitchtomovethedevicetothenextmode,Supervision.
FlippingthisswitchtomakethedevicebecomesupervisedchangesthebehaviorofAppleConfigurator’soptions.Therefore,youmustthenwipethedeviceandapplythemostrecentiOSupdate.
Onemightsaythatthesedistinctionshelptoprovethatthedeviceisindeedownedandunderthecontroloftheinstitutionmanagingthesedevices,asitisassumedthatregularpeoplewouldn’tletITseizetheirpropertyandremoveallpersonalizationorcustomization.(Iftheyarelikeourcustomersatleast.)However,AppleConfiguratorcaneasilybeusedinPreparemodetolightlyrunanOSupdate,installaconfigurationprofile,orevenperformabackupandrestoration.
NoteOurtechnicaleditorpointsoutthatthedevicemusttrustthecomputerrunningAppleConfiguratorfirsttoevendotheselighttasks,aswe’llexploitinChapter6,DebuggingandConclusion.
Thishelpsustoclearlydefinethedistinctionbetweenpreparationandsupervision,asthesecondlayer’spowerfulfunctionalityrestsontopofthefirst.Thelastmode,Assign,hasjusttwoadditions:
First,youcanleveragealocalornetwork-baseddirectoryserviceSecond,thedatacreatedbyauserfromthedirectorycanbestoredonthecomputerrunningAppleConfigurator
Thisallowstheusertocheckinorcheckoutofdataaswellassetsofapps,anditcanalsoaidinthedistributionofdocumentstodevicesthathavecompatibleappsinstalledonthem.Itmayseemlikewe’rejumpingaheadtodiscusstheAssignmode,butthat’sreallytheonlyadditionalfeature.
Otherthanthat,aswhiz-bangfeaturesgo,ifusersfromthedirectoryservicehaveimagesassociatedwiththeirLDAPrecords,thereisapreferencetoshowtheseimagesonthelockscreenwhenassigningdevices.YouwillaccessitfromtheAppleConfiguratormenuin
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thetopleft-handcornerofthescreen,underPreferences.However,thestarshaveneveralignedtothepointthatwe’veseenthatinuseintherealworld.Thefollowingscreenshotshows,inPreferences,whereanassigneddevicecanbeconfiguredtouseanimagefromLDAP:
InPreferences,whereanassigneddevicecanbeconfiguredtouseanimagefromLDAP
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TheimportanceofsupervisionOncethedevicehasbeenwipedandupdatedbybeingtetheredtoacomputerrunningAppleConfigurator,youcantakeadvantageofseveraloptions.Theseinclude:
Customizingthelockscreenimage,asshownintheprecedingimage,optionallywiththedevice’snameorsomeotherstatictextEnablingvariousnetwork-relatedfeaturesincludingAlways-OnVPN,Contentfilters,GlobalHTTPproxy(asdiscussedinthepreviouschapter),andcellulardatamodificationsRestrictingvariousfeaturessuchasthemanualinstallationofconfigurationprofiles,AirDrop,accountmodificationsincludingFindMyFriends,enablingotheron-devicerestrictions,education-specificconcernslikeSiri’sprofanityfilter,andwhitelistingdestinationsorpresettingpasscodesforAirPlayHide(bywhichwemeandisable,tobringabouttheeffectthattheappisnotshown)built-inapplicationslikeGameCenter,iTunesStore,iMessage,Podcasts,orstorecomponentslikeIn-AppPurchaseortheiBooksStoreStoptheremovalofanyotherapps,includingtheonesthatAppleConfiguratormayhaveinstalled,orpreventtheadditionofanyso-calledInternetaccounts(suchasFacebook,Twitter,andsoon)ore-mailaccounts
NoteRestrictingSafaridoesnotrequiresupervision,butitisacommonerrortobelievethatyou’llallowallthewebfunctionalityyouwantbyusingaWebClippayloadinaconfigurationprofile.Forexample,foraccessingyourintranetonly.IfyourestrictSafari,theappwillberemovedandWebClipswillnotevenlaunchifpresent.
Abiggerpointthaneventhesesettings,whichwereadvocatedbysomanyofApple’scustomersinlargeinstitutions,istheabilitytoinstallprofileswithzerotaps.IfthedeviceisstillinPreparemode,you’llneedtorespondtothepromptsonthescreentoacceptcertificatenotifications,learnaboutwhattheprofilewilldotothedevice,andeventually,install,andthentapondone,perprofile.Loadingaprofileontoasuperviseddeviceissilent.Infact,whenrestoringthebackuptosuperviseddevices,youdon’tevenneedtogothroughanysetuporactivationsteps.(MorerecentversionsofAppleConfiguratorcanallowsimilarbehaviorwithoutrestoringabackup,byselectingwhichpromptstoskip.)
Ifthiswasn’tasecuritybook,wecouldprobablystophere.However,byfarthebiggestpointfromasecurityperspectiveisthefactthat,bydefault,asuperviseddevicecanbedisabledfromconnectingtoanyothercomputerrunningAppleConfigurator.AnattackercannotpiggybackoniTunestotargetanotherdevicetoo.Thismitigatesmanyofthepairing-basedcomplicationsthatwe’llbediscussinginChapter6,DebuggingandConclusion.Infact,ifitwasdesirabletoallowmovinganycontenttothedevicefromanothercomputer,thedevicemustbedesignatedattimeofsupervisiontoAllowdevicestoconnecttootherMacs(bywhichtheyimplyPCsaswell).
Further,ifaspecificconfigurationprofilewitharestrictionpayloadisapplied,Allow
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pairingwithnon-Configuratorhostsmustalsobeselected.Ifyouwantto,thiscanallowyoutooptionallydisablepairinglaterviaMDM,incaseitisnotclearwhetheryourenduserswillneeditatthetimeofsupervision,butifyouareusingAppleConfiguratortosupervisethedevice,thenitmustbeconnectedtothecomputeragain.Youcanseeeachofthesesettingsinthefollowingscreenshot:
Thetwosettingsthatmustalignfordevicestobeallowedtopairwithanycomputer
Whendiscussingworkflows,wesaidAppleConfiguratorisagoodfitforhigh-service,fast-turnaroundusecases,whichleadstoanotherbigfeatureofsupervision:theabilitytorefreshthedevicetoastoredstateuponreconnection.Ifthisincludestherestorationofalargerbackupwithmanyapps,thiscanbeamorelengthyprocess,butinanycase,alloftheingredientsarecachedlocallyinAppleConfigurator’ssupportdirectories.(AppssuchasiMovieandKeynoterunintohundredsofMBsandflashstorageingeneralisoptimizedforreadingandnotwriting,soit’sgoodtomeasureifthecycletimemeetsyourexpectations.)ThiscanessentiallyreimagetheiOSdeviceifAppleConfiguratorisopenonthecomputertowhichthedeviceisattached.
Optionally,intheeventyouarenotrestoringabackup,youcanalsohaveappsandprofilesthatmayhavebeenaddedtothedeleteddevice,sousertrainingregardingsuperviseddevicesisveryimportant.Ifthisbehaviorisnotdesiredforanyreason,youmustatleasttemporarilyturnoffthesesettingsinAppleConfigurator’sPreferences,asshowninthefollowingscreenshot:
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InPreferenceswheresuperviseddevicesareconfiguredtoautomaticallyrefreshwhentheyareconnected
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Apps,VPP,andAppleConfiguratorWhentheusagemodelisonecustomerforonedevice,anMDMcanpromptanenduserfortheirAppleID.AppleConfiguratordoesn’trequireauserthatreceivesadevicepreparedbyittopluganythingin,allowingsharedusagemodelsthatjustweren’tpossiblebefore.
IfanAppleIDisauthorizedforuseonthecomputerrunningAppleConfigurator,evenifitisnotassociatedwithVPP,youcangoaheadandimportanddistributefreeapplications.Therecommendedwaytogoaboutobtainingthe.ipafiles(thearchivedbundlesthatareiOSapplications,asdiscussedinChapter2,IntroducingAppSecurity)istodownloadthemfromtheAppStoresectioniniTunes.However,nomatterwhatIDtheappwasdownloadedwith(forexample,ifaniOSdevicealreadysynchedwiththecomputerandbackedupitspurchaseswithiTunes),theDRMcanberemovedfromtheappbundleandimportedwithwhateverAppleIDAppleConfiguratorwantstouse.However,ifyouforgettoauthorizethecomputeriniTunes,you’dseethefollowingerror:
WhenanapptobeinstalledonadeviceisimportedwithouttheassociatedAppleIDauthorizediniTunes
NoteKeepinmindthattheupdatesforanyapplicationinstalledwithAppleConfiguratoraretiedtotheAppleIDitwasimportedwith,whichmayhaveunintendedconsequenceswhenitpromptsforupdatesoneverydevice.
ThisisespeciallytruewhentheAppleIDhasane-mailaddressfortheusernamethatisnotassociatedwithyourinstitution,becauseendusersseeitwhenprompted.We’renotsayingthatthishashappenedtoanyofourcustomers.
Ifyouhavedifferentgroupsthataresharingthesamesetofsuperviseddevices,appscangooutandcomebackinifanothersetupisrequiredwheretheseappsshouldn’tbepresent.AppleConfiguratorcangroupdevicesarbitrarilyasyouchooseandapplysettingsasneeded,andappsareoneofthethingsthatcancomealongfortheride.
TheseprocessesarejustthesameforpaidappsthathavebeenpurchasedundertheVPP.Itbecomesveryimportant,however,tofollowApple’sguidanceastowhatversionofVPPpurchasesshouldbechosenbasedonyourusecase.Also,youshouldbecarefultonotapplyanapptoadeviceifithasnotbeenfirstputintotheSupervisemode,asthiswillnotallowyoutoreclaimtheappcodeifyou’rerelyingonthismethodofappdistribution.
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Whilethisisnotnecessarilypertinentforasecuritydiscussion,theonlineVPPportalfromAppleprovidesaninterfacetodownloadredemptioncodesforusewithAppleConfigurator,anditinquiresinternallyhowmanyofthesehaveeverbeenappliedtodevices.TheAppleConfiguratorinterfacehelpfullyprovidesfeedbackabouthowmanyhavebeenredeemedperproductanditprovidesaspreadsheetofcodesaswell.Itmayseemobvious,butdonotusethesamespreadsheetofcodeswithanMDMorotherdistributionmethods.
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MassrestoringandnamingofdevicesFromabrandingorsupportstandpoint,havingtheiconsconsistentlyarrangedwithastandardhomescreenbackgroundisdesirable.AlthoughMDMsaresupposedlygainingthisfunctionality,theoriginalwaytodothesecustomizations,whetherinthePrepareorSupervisemodes,istocreateabackup.(BackupsmadefromadeviceinonemodecannotberestoredtoanotherwithAppleConfigurator.)ThisoftenrequiresmanualinteractionandifyouhaveanMDM,itwouldmakesensetoallowittoperformanyapplicableconfigurations.It’sverystraightforwardintheinterfacewhereyouwouldinitiatethecreationofabackupwhenyouareineithermode,andyoucanevenaccessthestoredbackups.
AppleConfiguratoralsoprotectsthethroughputoftheUSBbusbylimitingconcurrentoperationstosomewhereintherangeofthreeatatime.
NoteNotethattheapplicationislimitedto30concurrentUSBconnectionsoverapoweredhub,whichisobviouslynotthemaximumfortheprotocol.
Also,keepinmindthatexceptwithveryrecent,specializedhardware,USBhubscanpracticallybeconsideredaddresslessexceptforphysicalidentification.Themostreliablewaytobeconfidentthatdevicesonalargehubarebeingnamedorotherwisepreparedinaparticularorderistoattacheachcabletothedeviceinthesequencethatyoulike.
Notethatifyousupervisedadeviceanditislost,stolen,orbrokentothepointthatitcannotreconnecttoAppleConfigurator,youwillloseanyapplicableappcodesifyouareusingVPP.(Whichistosaytheoriginal“redemptioncodes”versionincomparisontothelicensesmodelreferredtointheVPPportalas“manageddistribution”,forusewithMDM.)Toreclaimthepreviouslysuperviseddevice’snametokeepyourinventoryneat,youcanselectitfromthelistinAppleConfiguratorandundertheDevicesmenu,holddowntheOptionkey.UnsupervisewillchangetoRemoveandyoucanprepareanewdevicetotakethatslotinthesequence.Thesamegoeswhenadeviceisrepairedandreplacedwithadevicethathasadifferentserialnumber,ifyouwerenotabletounsupervisethepreviousdevicebeforeitleftyourpossession.
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BackupconcernsWhenthereisasupervisionrelationshipbetweenmanyofyourdevicesandyourealizethatonlysmallworkgroupsorsetsofdevicesfitintheAppleConfiguratorusagemodel,backupsbecomecrucial,andalternativestopreventover-relianceoranabundanceofhackyworkaroundsbecomeattractive.Takingbackupsasthefirsttopic,Appleshipsbuilt-inbackupsoftwarecalledTimeMachinethatcanbeusedtoprotectthecomputerthatrunsAppleConfigurator,butitislimitedinitscapabilities.Youcaneitherdirectlyconnectaharddrive(whichcanbeencrypted),orsendthebackupoverthelocalnetworktoamachinerunningacompatibleendpoint.Itisnotoptimizedforover-the-WANoffsitebackup,amongothershortcomings.
Toseparatelyunderstandthefilesinuse,firstwe’llrepriseourtalkaboutsandboxing.Inararereversalofthe“doasIsay,notasIdo”maxim,AppleisfollowingitsownruleswithAppleConfiguratorbyusingthecontainermodelforitsdatastorage,whichputsthefilesitoperateswithawayfromtheviewoftheuser.Itisliterallydeepwithinahiddenfolder.YoucanreachitbynavigatingtoUsers|CurrentUser(thecurrentuser’sname)|Library|Containers|com.apple.configurator|Data|Library.Yes,therepetitionisintentional.
SimilartoTimeMachine,AppleConfiguratorleverageslinkstorefertofilesoutsideofitssandboxforwhichitdoesn’tneedwriteaccess.(TimeMachineuseshardlinkstostubunchangedfilesfrompreviousbackups,whichletsitpresentacompletesetwhenyoubrowsethemostcurrentfolderstructureinitsstoragedestination.)
AnotherrepeatedpatternistheuseofSQLiteasthestoragemechanismforthedatabaseofsuperviseddevicesandotherinventory-relatedinformation.ThisislocatedinasubdirectoryofthepathlistedearlierandyoucangotoitbynavigatingtoApplicationSupport|com.apple.configurator|AppleConfigurator.storedata.iOSsoftwareupdatesthatareoftenfullOSinstallationsgetcachedwithinFirmwareunderCachesandappsimportedintotheprogramgetstoredinResources,whichyoucanreachbynavigatingtoApplicationSupport|com.apple.configurator.
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ConfiguratoraschaperoneItisacommontroubleshootingtiptoturnuptheverbosityofaprocess,lookthroughthelogs,andcheckanysettingsorconfigurationfiles.MacfolkshavelonggatheredcommandsthatenablehiddensettingsinpreferencefilesthatareApple-flavoredXMLfiles,justaswesaidwerethecaseforconfigurationprofiles.Ifyourundefaultswritecom.apple.configuratorLogLevelALL(withthepreferencedomainmappingtothepathofcom.apple.configurator.plistatPreferencesbynavigatingtoUsers|CurrentUser(thecurrentuser’sname)|Library|Containers|com.apple.configurator|Data|Library),youwillcauseinformationaltextbuiltintothedebugoutputoftheapplicationtobewrittentologs.Youcanthensiftthroughthisinformationbyviewingsystem.logintheConsoleapplicationinsidetheUtilitiesfolderinApplications,ifyou’rerunningasanadminuseronMac.(Otherwise,youcantailthesystem.logfilebynavigatingtovar|logifyoucanelevateyourselftoanadminuserfromashell.)
Sometimes,oldcodenamesforapps,devices,orfeaturesstickaroundintheinnerworkingsofapplications,andifyourundefaultsreadontheprecedingfile(oropenitinabinaryplistcompatibletexteditorsuchasXcode),you’llnoticetheChaperoneCertificateIssuerandChaperoneCertificateSerialkey/valuepairs.SupervisionmayverywellhaveusedthisChaperonenaminginternallyatAppleduringdevelopment.Similarly,thenameoftheprofilethatAppleConfiguratorinstallswhensupervisingthedeviceisreferredtoascom.apple.configurator.chaperoneprofile.Thefollowingscreenshotshowsthesettingsonasuperviseddevice;thisisanexampleofAppleConfigurator’sinstalledprofile:
InSettingsonasuperviseddevice,thisisanexampleofwhatAppleConfigurator’s
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installedprofilelookslike
InpastversionsofAppleConfigurator,youwouldseethattheconsoleoutputalsomentionstheBoolean(true/false)valueforthe“chaperoned”propertyofadevicethatisbeinginteractedwith.ThisconceptofahosthavingaresponsibilityrelationshipwiththedevicehelpsfurtherstresstheimportanceofguardingthecomputerthatisrunningAppleConfigurator.Ifthismachineisevercompromised,(orperhapsevenworse,experiencesdataloss)youwouldbeinquiteapickleindeed.
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ActivationLockandFindMyiPhoneAboonfortheftprevention(orabustfortheiOSdeviceresalemarket),istheimplementationofanewfeature,asofiOS7,byApplecalledActivationLock,whichisanextensionofiCloud’spreviousFindMyiPhonefeature.IfyouhadaniCloudaccountconfiguredwiththesettingonaniOS7deviceanditneededtobereactivatedfromscratchafterarestore,theprocesswouldnothavebeenabletoproceeduntilthataccount’spasswordwasentered.Thiswasfelttobeaburdenandamanagementheadacheforthosewholentoutdevicesregularly,butbysomemunicipality’sstatistics,thisalonereducedtheftofiOSdevicesastheybecamepracticallyuseless.
NoteAfewlinkstonote
Thecitationfortheclaimthatthefts(andtheiPhoneresalemarket)areimpactedbythisfeaturecanbefoundathttp://arstechnica.com/apple/2014/06/ios-7-activation-lock-cutting-iphone-theft-damages-resale-market/.
Apple’sCheckActivationLockStatuspageathttps://www.icloud.com/activationlock/forusebeforeyoubuyorreceiveaphone.
LookatApple’sguidanceonhowtodealwithadevicethatisstilllocked(http://support.apple.com/en-us/HT201441)orpreparingyourowndeviceforsale(http://support.apple.com/en-us/HT201351).
Apple,asthecentralclearinghouseofdevicesthatmustcomeontothenetworkandcheckinbeforebeingallowedtobeactivated,cantheoreticallyensurethatdevicescanonlybeactivatedbytheirrightfulowners.
Toaddresstheproblemofinstitutionsthatwantcontroloverwhethercustomerscanenablethisfeatureanddonotfinditdesirablewhenthey’dliketoreprovisionthedevicetoanotheruser,twotechniquesexist.ThefirstoneisthatanMDMcanblockActivationLockuntilabypasscodecanbegeneratedforthedeviceandsenttotheserviceforacertainwindowoftimeafteranenrollmentthatisakintoafulldiskencryptionkeyescrow,whichprovidesadistinct,non-identifying“getoutofjailfree”cardsothatyoucanreactivatethedevicewithoutthepresenceofthepreviousiCloud-identifieduser.Youcanfindmoredetailsathttp://support.apple.com/en-us/HT202804inApple’sdocumentationabouthowtheyrecommendfolksmixtoolssuchasanMDMorAppleConfiguratorintotheirsupportproceduresaroundActivationLock.
ThereferenceimplementationofMDMforApple,theProfileManagerserviceintheirOSXServerapp,hasspecificdocumentationontheActivationLockbypasscodeat:
http://help.apple.com/profilemanager/mac/4.0/#/apd94BD5B2E-6448-450D-B76F-605AEEEEC9D7.
TheothertechniquetodealwithActivationLockisthatbydefaultsupervisiondoesnotallowthisfeaturetobeenabledinthefirstplace.AreyougettingtheideathatApple
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reallywantsyoutosuperviseyourdevices?OnlyifyouthenuseanMDMthatenablesthefeature(viaescrowingabypasscodeorotherwise)candevicesusethefeature.EveniftheenduserenablesActivationLockonasuperviseddevice,puttingthedeviceintoRecoverymodewillallowyoutowipe(orprepareorrefresh)itasyouseefit.Ifyou’regivenadevicethatwasnotsupervisedbeforeActivationLockwasenabled,youwillgetanerrormessagethatsaysthatitis“UnabletocheckiOS”.
RecoverymodeisastatewherethedevicehasbootedtoitsfirmwareandhasbeentoldthatitneedsafreshOSinstallation.ItpreviouslyshowedaConnecttoiTunesmessagewithaUSBconnector,butnowitshowsanarrowfromalightningconnectortothenewrediTunesicon(http://support.apple.com/en-us/HT1212).YoucanalsouseautilitylikeRecBootorothersifyouoftenfindyourselfrecoveringaforgottenpassword,butbesuretocarefullyevaluateandinspectapplicationsthatpurporttodocoolthingstoiOSdevices,astheyarenotofficiallysanctionedbyAppleandmaybefromcompromisedsources(http://jaxov.com/2010/05/recboot-iphone-recovery-mode/).ThefollowingscreenshotshowsapromptthatdisplaystheerrorencounteredwhenyoutrytoprepareadevicewithActivationLockenabled:
TheerrorpresentedwhenyoutrytoprepareadevicewithActivationLockenabled
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AddressingtheroughspotsForyears,Applesaidyoucouldtryastick-and-carrotapproach,usingHRpolicyandenticementstostopendusersfromremovingMDMorsupervisionprofiles,withtheultimatecaveatbeingthatenduserscouldalwayswipethedevice.iOS8finallydeliveredamorecomprehensivewaytoensurethatthedevicesaremanagedafterbeinggiventoendusers.Now,thereisarestrictiononaccesstothesettingthaterasesalldataandsettingsifthedeviceissupervised,butonlyDEP,whichwe’lldiscusslater,trulykeepsthedevicelockedtoyourMDM.Youcanalsorestricttheremovalofprofilesbysettingpasswordsasneededforremovalinanadhocmanner.
Betweenthesmall(intended)workgroupscale,inflexibilityregardinginteractionwiththingslikebackups,andthesingular,fatclient-basedpointoffailure,manyhavehopedthattherewereotheroptions.GroundControlisanewproductthatcanprovidesomeofthepowerfulfeaturesandfunctionalityofConfiguratorwithoutitslimitations.(Disclaimer:oneofourtechnicaleditorsistheleaddeveloperonthisproject.)Thiscloud-basedsolutionaimstoputtightcontrolofthedeploymentprocessinthehandsofthestakeholders.Youcanlearnmoreaboutthisathttps://www.groundctl.com.
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DEPversusAppleConfiguratorTheDeviceEnrollmentProgram(DEP)isprovidedbyAppletoalterthesetupassistantsothatdevicescanbeunboxedbyendusers,buttheyarethenforcedtoenrollintotheMDM.DEPcanalsoenablesupervisionwithoutAppleConfigurator.Infact,ApplerecommendsthatyouarenotsupposedtousedevicesthathaveDEPwithAppleConfigurator,atleastwhiletheyareassignedtoanMDM.JustasActivationLockwouldcausetroublewithAppleConfigurator;DEPwouldliketokickinwhenthedeviceisbeingactivated,andthisisnotcurrentlyengineeredintotheproduct.Apple’sdocumentationregardingtheexampleusecaseswhereDEPcanbeusedwithAppleConfiguratorisfoundathttp://support.apple.com/en-us/HT201092.
TogetgoingwithDEP,asignificantamountofpaperworkisrequiredsuchasassociatingAppleIDs,trackingdownpurchases,gettingaD-U-N-Snumberifyoudon’talreadyhaveoneforyourAppleEnterpriseDeveloperaccount,andthenconnectingtheDEPportaltoyourMDM.Andevenbeforeallthat,itmaynotbeavailableinyourcountry.ThecompletelistofcountriesthathaveDEPcanbefoundathttps://deploy.apple.com.
TheactualmovingpartsforsettingupDEPwithyourMDMaremostlyconcernedwithwhatyouwanttoseeaspartofthesetupassistant.ThereisalsotheoptiontolocktheMDMprofileandenablesupervision.
Keepinmindthatthingssuchassupervisionandlockingdowndevicesshouldn’tbeaconcernwhenyou’reonlysupportingaBYODprogram.However,therearecertainlymanyimportantconsiderationstokeepinmindwhenyoutransitionfrompreviouslydeployedandsuperviseddevicestoDEP.Justlikesupervision,youmustwipethedevicesothatitalwayspointstoyourMDMduringsetup.Thisbringsustoabitofashow-stopperformany,andthatisthefactthatyouarenotsupposedtorestorethebackuptakenfromthesamedevicethatisnowbeingassociatedwithDEP.
Thismakesitsoundlikethereisn’tarealmigrationpathforpre-existingmanageddevices.Wearenotmakingthisup.Formoreinformation,youcanrefertohttp://support.apple.com/en-us/HT202977.YouareevenexpectedtoMDM-wipeorAppleConfigurator-unsupervisedevicesbeforetheycanbeconsideredactivewithinDEP.Formovingdata,thefollowingchoicequoteisincludedunderAppleConfigurator:TransitioningtoAppleDeploymentPrograms:
WhenaniCloudbackupisrestoredtothesamedevice,allsupervisionandprofilescomefromthebackupregardlessofhowitwasconfiguredintheDeviceEnrollmentProgram.Forthisreason,whenrestoringbackupseachusershouldtransitiontoanewordifferentdevicetoensureDeviceEnrollmentProgramsupervisionandMDMenrollmentareenforced.
Whenwefiledaradar(bugreport)onthisbehavior,theresponsereceived“worksasintended”.
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GuidedAccessversusAppLockversusSingleAppModeTheprevioussectiononGuidedAccessinChapter2,IntroducingAppSecurity,introducedustotheconceptofputtingthedeviceintoamodewhereverylittlecangowrongwithit,butthisalsolimitsittoasinglepurpose—lockingthedevicetorunonlyoneapp.Notethatthiswouldonlybeapplicableforsuperviseddevices.AppleConfiguratorcanbetoldwhichapptorunandthedevicewillbypassthehomescreenafterthedeviceiswokenfromsleep.ThepreviousguidanceappliesformakingsurethatyoucangetaccesstotheAppleConfiguratorstationincaseitneedsmaintenance,ortomakesurethatthenetworkaccessisreliableifusingSingleAppModewithMDM.Inaddition,ensurethatthepowersettingsareapplied,asenduserswouldneedtoputthescreentosleepmanuallysincetheydon’thaveaccesstosettings.
AsSingleAppModeallowsadhoc,over-the-airapplicationoftheprofiletomakethedeviceenterthislocked-to-appmode,youcanfirstallowenduserstosetapasscodeonthedevicebeforethehomescreenbecomesinaccessible.Whilethisallowsittoremainlockedwhenunattended,makesureyouconsiderappsthatpromptforauthenticationandallowyoutologoutifsensitivedataorsystemsaretobeused.
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ActiveSyncYoumaygetalongverywellwithoutanyofthesetoolsthatwe’vediscussedsofar.Inaddition,MDMisnotparticularlynecessaryiftheActiveSyncprotocoldeliverstherestrictionsandsecurityfeaturesthatyouneed.TheprotocolwasalsoadoptedbypaidversionsoftheGoogleAppsproductanditisnativelysupportedwhenyouconfigureanExchangee-mailaccountoniOS.
ManyaspectsoftheserverandOutlookWebAccessinterfaceworkinexactlythesamemannerwithiOSastheywouldwithBlackberry,Symbian,WindowsMobile,WindowsPhone,oranAndroiddevice.However,whilethe14.0versionofthespecificationshouldbesupported,theactualapplicablesettingshaveremainedsomewhatunchangedforyears.Recently,Microsofthasbeenpromotingvariousnewproductstomanagemobiledevices,whichsupportthenativemanagementframeworksofeachofthepopularplatforms.
Asarefresher,managementsettingsenforceableviatheActiveSyncprotocolareasfollows:
Wipingthedevice(ifthedeviceislostorstolen)Enforcingadevicepasscode,withcomplexity,expiration,history,timeoutbeforeprompt,andfailedattemptthresholdsAllowinguseofthecamera(whichwasoriginallyfocusedaroundcourtsorgovernment-relatedbuildingsandcontractors)Disablingsyncwhilethedeviceisroamingtohelpwithdatausagewhileyouareoutsidenormalcellularcoverage
Further,viaaconfigurationprofile,youcanlimithowfarinthepastyourmailissynced,alongwithotheraccount-specificsettingslikecertificates.
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SummaryOverthecourseofthischapter,wespentalotoftimeinvestigatingAppleConfigurator.WediscussedthePreparemode,whichcanmakelightweight,one-offchangesasperyourneed.Supervisionandusercheckoutorassignmentsetsuplong-termmanagement“chaperone”relationshipswithiOSdevices.WewentoverhowAppleConfiguratordistributestheolderversionofVPPappcodesandhowitcanlockthedeviceintoanapp.AsActivationLockhelpedtomakeadevice’stheftbecomelesseffective,supervisionalsoprovidedasafetynetforinstitutionsbyallowingthemtoreclaimdevicesviatheRecoverymode.WealsoremindedyouthatbeforeevaluatinganMDM,manyrestriction-relatedfeaturesareactuallyavailabletoActiveSyncasanalternative.
Forsecurityprofessionals,itmayseemlikeAppleiscluelessabouttheneedsoflargeenterprises,andAppleConfiguratormaynothelpwiththatimpression.Butbyprovidingbestpracticeswe’releftwiththemostsupportablemanagement,whichworkswiththeplatforminsteadofagainstit.Applehaspushedtheideaof“tierzero”or“thenewIT”asahands-off,infinitelyscalablesolutionwhereITletsendusersperformmaintenancetasksanditdoesn’tneedtobuildwallsbetweenworkandpersonaldataineveryone’sdevices.Wecandoourbestworkwhenweareprotectingdevicesbyconcentratingonhowlittleofthedeviceneedstobemanaged,eveniftheyareownedbyinstitutions.Evenwhenitseemsthatthecontrolsthatareavailablearen’tofindustrialstrength,practicalconcernsaregoingtotrumpatightlylocked-downexperience.Apple,itscustomers,anditsdevelopersstillneedroomtoexperimentandbringrealinnovationandproductivitytomobiledevices.
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Chapter5.MobileDeviceManagementMobileDeviceManagement(MDM)referstothetechnologythatallowsthecentralizedmanagementofmobiledevices,includingthosethatrunApple’siOS.CentrallycontrollingiOSdevicesisanabsoluterequirementformanylargeorganizations.Centralizedmanagementisalsobecominganecessityinsmallerenvironments.Therearealotofproductsthatcanbeusedtomanagedevices.TheserangefromtoolssuchastheinexpensiveProfileManagerbuiltintotheMacOSXServerapplicationtothird-partytoolssuchasAirWatch,MaaS360(byIBM),MobileIronJAMF’sCasperSuite,andBushel.
NoteIntheinterestoffulldisclosure,Bushelisbeingdevelopedbyoneoftheauthorsofthisbook.Bushelisrepresentedherebecauseofthedepthofknowledgethattheauthorshaveoftheproduct.
Inthischapter,wewillcoverthefollowingtopics:
IntroducingMDMUsingconfiguratorversusmobiledevicemanagementProfileManagerIntroducingBushel
Thesearemeanttoshowcasethetechnologyandarenotanendorsementofanysinglesolution.Thereasonthatit’shardtoendorseanysinglesolutionisthateachhasspecificstrengthsandweaknesses,andeachshouldbeconsideredindependentlyaccordingtotheenvironment.
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IntroducingMDMAsmentioned,MDMisatechnologythatempowersyoutocentrallymanagemobiledevices.MDM’sframeworkisdevelopedbyAppleandworksusingtheApplePushNotificationservice(APNs)tosendmessagesfromApple.ThenotificationsbytheAPNsdonotactuallycontaincommandsorsettings,butinsteadnotifythedevicetolookbackatanMDMserver,topullcommandsthatarewaitingontheserver.
MDMcommandscanwipe,lock,andperformothertasksondevices.MDMcommandscanalsoleverageprofilestoconfiguresettingsondevices,similartohowweconfiguredsettingsusingAppleConfiguratorinthischapter.However,whenconfiguringsettingsviaanMDMsolution,theprofilesareinstalledovertheair.Thisallowsyoutochangesettingsdailyorbasedonadevicemeetingaspecificrequirement.Forexample,withsomethird-partytools,youcanwipeadevicebasedonthegeographiclocationofthedevice.MDMreferstothemyriadoftechnologiesthatgointofacilitatingthesetransactions.
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ConfiguratorversusMDMInChapter4,OrganizationalControls,welookedatmanagingdeviceslocallyusingtheAppleConfigurator.TheAppleConfiguratorworksbyinstallingprofilesondevicesusingtheUSBconnectionfromthecomputertothedevices.Thisworksgreatincertainenvironments,suchaswhenyoujustwanttoloadsettingsontoadevicepriortogivingitouttoauser.However,foranumberofscenarios,youwillwanttoupdatedevicesovertheair.And,foranumberofotherscenarios,youneedtouseAppleConfiguratororacombinationofAppleConfiguratorandanMDMsolution.
Asmentioned,thereareanumberoftasksthatcannotbemanagedusinganMDMsolution.Theseincludethefollowing:
RestoringdatatodevicesSettingthebackgroundimageofdevicesUpgradingdevicesEnablingsupervision,withtheexceptionofDeviceEnrollmentProgram(DEP)devices(DEPallowsAppledevicestobetiedtoanMDMsolution)
AppleConfigurator,ontheotherhand,canbeusedforalloftheprecedingpoints,aswellasenrollingintoanMDMsolution.ItcanalsobeusedtosupervisedeviceswithoutanMDM,thebenefitsofwhichwediscussedinthepreviouschapter.ThismakesusingAppleConfiguratoraviableusecaseforthetasksitcanperform;italsohelpstoautomatethesetupofalotofdevices.
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TheProfileManagerTherearealotofproviderswithMDMsolutions,suchasSymantec,IBM,Sophos,JAMFSoftware,andothers.We’regoingtouseProfileManagerinthischapter,notbecauseit’sthebestofthem,butbecauseit’sanAppleproduct.ThefeaturesofeachMDMsolutioncanbequicklyandeasilycomparedathttp://www.enterpriseios.com/wiki/Comparison_MDM_Providers.
Inthischapter,wewilllookattwosolutions.ThefirstisApple’sProfileManager.ThisisaserviceincludedaspartoftheServerapplication,whichrunsonMacOSXandisbuiltbyApple.TheServerappcanbepurchasedfromtheMacAppStoreforaround20dollars(USD).However,theProfileManagerisnotacompletesolutionformany;itlackssomescalabilityandeaseofusethatothervendorshavebuiltintotheirproducts.ThesecondisanewcomercalledBushel.TheProfileManagerrequiresanOSXServer,whereasBushelisaSaaSsolution.
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PreparingtheProfileManagerServerAsmentioned,ProfileManagerrequiresaMacrunningOSXServer.Inmanycases,thisserverisasimpleMacminiserver.BeforewegetstartedwithinstallingtheServerapplicationandshowinghowtouseProfileManager,preparethecomputerthatwillbeusedastheserver.
TipFortesting,theservercanbeavirtualmachinewhenrunningonApplehardware.
SettinguptheProfileManagerinvolvespreparingtheserverbyconfiguringastaticIPaddressontheOSXServer.OnceyouhaveinstalledtheServerappfromtheMacAppStore,configureastaticIPaddressusingtheNetworkSystemPreferencespane.Oncedone,youwillneedtoproperlyconfigureahostname.
ThehostnameinthisexamplewillbeYosemiteserver.krypted.com.Wheninitiallysetup,aself-signedcertificateisinstalled.It’ssimpletogenerateaCSRandinstallacertificatefromaCertificateAuthority(CA);however,doingsoisbeyondthescopeofthisexample.Performthefollowingsteps:
1. First,elevateyourprivilegesbyinvokingbashwithsudo:
sudobash
2. Next,configurethehostnameusingthescutilcommand:
sudoscutil--setHostNameYosemiteserver.krypted.com
3. Then,configurethecomputernameusingtheComputerNameoptionwiththescutilcommand:
sudoscutil--setComputerNameYosemiteserver
4. Finally,configurethelocalhostnameusingtheLocalHostNameoptionwithscutil:
sudoscutil--setLocalHostNameYosemiteserver
NoteTheprecedingComputerNameandLocalHostNameoperationscanbeperformedusingtheSharingSystemPreferencepane;however,wearedoingitheresincewearealreadyinthecommandlineanditsonelessscreenshottotakeuphalfapage.
Oncethenamesareproperlyconfigured,checkwhethertheyfunctionproperlyusingthechangeipcommand:
sudochangeip-checkhostname
Theoutputofthechangeipcommandshouldappearsimilartothefollowingexample:
Primaryaddress=192.168.210.201
CurrentHostName=Yosemiteserver.krypted.com
DNSHostName=Yosemiteserver.krypted.com
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Thenamesmatch.Thereisnothingtochange.
dirserv:success="success"
Ifyou’reunsuccessfulanddon’tseesuccess,youmayneedtodosomeworktoresolvethedomainnames:
1. WhenhostingyourownDNSfromwithintheServerappontheProfileManagerserver,verifythattheDNSserverissetusingtheIPaddressusedontheserver.
2. WhenhostingaDNSonanActiveDirectory-basedDNSserverorothernon-localDNSserver,verifythatyouhaveproperlyworking,forwardandreverserecordsforthehostnameandIPaddresscombinationinuseontheOSXServerortheActiveDirectoryintegratedserver.
3. FromtheServerappontheProfileManagerserverorotherMac,clickontheWebsitesserviceandthenontheONbutton(whichwouldsayOFFtostartwith).Don’tconfigureanythingelseforthewebserver.
4. Whentheservicestarts,youwillseethepathtothedefaultwebsites(/Library/Server/Web/Data/Sites/Default)andaViewServerWebsitelinkwillbedisplayedonthescreen,asshowninthefollowingfigure:
Thesetupofthewebservice
ClickontheViewServerWebsitelinkatthebottomoftheServerapp.ThenverifythattheWelcometoOSXServerpageloads.Doingsoverifiesthatthewebservice(Apache)startsproperlyandisaccessible.
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PreparingProfileManagerOnceyouseetheWelcometoOSXServerpage,clickonProfileManagerintheServerappsidebar.Then,clickontheConfigurebutton,showninthefollowingscreenshot:
TheProfileManagerService
TheConfigureDeviceManagementassistantappears.ClickontheNextbutton.
ManyenvironmentswillhaveanexistingdirectoryservicethattheProfileManagerserverconnectsto.IfyouconnecttoActiveDirectory,thenProfileManagerwillrequireanOpenDirectorymasterorreplicatobeaccessible.Ifthereisnone,thenclickontheCreateaNewOpenDirectorydomainintheConfigureNetworkUsersandGroupsscreen(orgoontocreatetheDirectoryAdministratoraccountifpromptedtodosoinstead).ThisdirectoryservicewillbeusedforProfileManager.Ifyouhaveanexistingdirectoryservice,thentheexistingservicewillbeusedforusernamesandpasswordsandthisoneyoujustcreatedwillonlybeusedforProfileManager.
Ifyou’recreatinganOpenDirectorydomain,clickontheNextbutton.Then,provideanadministrativeusernameandpasswordforOpenDirectory.Thedefaultusernameisdiradmin.ClickontheNextbutton.
WhenpromptedontheOrganizationInformationscreen,providethenameofyourorganizationandanadministrator’se-mailaddress(thee-mailaddresstoputoncertificates),asinthefollowingscreenshot,andthenclickontheNextbutton.
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Providinganorganization’sinformation
ThesettingsyouusedarethendisplayedontheConfirmSettingsscreen.
ClickontheSetUpbutton.Ifpromptedtodoso,chooseacertificate(thenextscreenshot)andthenclickonNext.
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ConfiguringanSSLCertificate
Forthisexample,wewillusetheself-signedcertificatecreatedbyOpenDirectoryandclickonNext.
TheAPNscertificateestablishesatrustrelationshipbetweenAppleandyourProfileManagerserversothatpushnotificationscanbesenttodevices.YoushoulduseaninstitutionalAppleIDforyourorganization(forexample,<apns@krypted.com>)ratherthanaprivateone(forexample,<charlesedge@krypted.com>).OnceyouhaveenteredthecredentialsforavalidAppleID,clickontheNextbutton.
ProvidedtheAppleIDauthenticatesandeverythingworksasintended,clickontheFinishbuttontocompleteandexittheconfigurationassistant.TheConfigurebuttonshouldthenbegone.OncebackattheProfileManagersettingsinServer,selectSignConfigurationProfiles,displayedinthefollowingscreenshot:
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Signingupyourconfigurationprofile
FromtheCodeSigningCertificatesheet,choosetheappropriatecertificate,andclickontheOKbutton:
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Choosingacodesigningcertificate
NoteYoucanalsoimportacertificatehereifyouhavepurchasedacode-signingcertificate.
CompletingPostConfigurationtasksEnabletheIncludeconfigurationforservicesoptiontoautomaticallybuildyourconfigurationprofilesettingsforserviceshostedontheserver(Mail,Calendars,VPN,andsoon).IfyouusetheProfileManagerserverforotherservices,leavethisoptionenabled;otherwise,disableitasseeninthefollowingscreenshot.
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Enablingconfigurationforservicesrunningontheserver
Apple’sVolumePurchaseProgram(VPP)allowsyoutobuyappsontheMacAppStoreoriOSAppStoreinbulkanddistributethemtousers.Youcanalsorevokeappswhenemployeesleaveyourorganization.VPPalsoallowsyoutomanageiBooksaswell.ProfileManagercanhelpyoudistributetheseappsandiBooks.
ToenabletheVPPfeaturesofProfileManager,youwillfirstneedaVPPaccount,whichcanbeobtainedfromdeploy.apple.com.Onceyouhavecreatedthisaccount,downloadyouruniquetokenfile.Then,backinProfileManager,enablethecheckboxforDistributeappsandbooksfromtheVolumePurchaseProgram.ClickontheChoosebuttonandselectthetokenfileyoudownloadedearlierfromApple.
Oncetheseappsareadded,clickontheONslider(whichwouldsayOFFuntilclicked).DoingsostartstheProfileManagerservice.OnceyouseetheURLtoaccessyourwebinterface,youcanstartmanagingdevicesusingProfileManager:
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AccessingtheProfileManagerservice
OncetheProfileManagerserviceisstarted,clickonOpenProfileManageratthebottomoftheProfileManagersettingsscreen.AuthenticateyourselfontheloginpagetomanageyouriOSandOSXdevices.
UsingProfileManagerOnceyoulogin,thereisatonofoptions.Youcanconfigurepoliciesfordevicesandplaceholdersandgetlostprettyquickly.Hence,we’regoingtoprovideaprimeronconfiguringprofilesandmanagingdevices.TheeasiestwaytogetstartedistousetheEveryoneprofile.Thisprofileallowsyoutoconfigureprofilesforservicesrunningontheservertodeploysettingstoallusersenrolledontheserver.
TheEveryonegrouphasaRestrictionssection,whichallowsadministratorstorestrictaccesstovariousProfileManageroptions.TheseincluderestrictingaccesstotheMyDevicesportal(we’llcoverusingMyDevicesforenrollmentlaterinthischapter),lockingfordevices(anoptionwithinMyDevices),andtheabilityforuserstowipetheirownAppledevice.
TipTheDEPisasystemthatautomaticallyconfiguresAppledevicestojoinanMDMuponsetup,whichbeginsaprocessthatuserscancomplete.YoucanallowyouruserstoautomaticallyenrollviaDEPhere.
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ActivationLockisafeatureiniOSthatrestrictsadevicefrombeingerasedandreactivatedwithouttheAppleIDthatwasusedtooriginallysetuptheActivationLockfeatures.Thiscanbechallengingifusersdonotactuallyowntheirdevices.Whenrunningsuperviseddevices,youcandisableActivationLockorgenerateabypasscodetounlockadevicethathasbeenlockedthroughActivationLock,asshowninthefollowingscreenshot:
LoggingintoProfileManagerforthefirsttime
EnrollingintoProfileManagerTomanageadevice,youmustfirstenrollthedeviceinProfileManager.Enrollmentisanopt-inprocedure,unlessthedeviceisassignedtoanMDMserverviaDEP.UsetheURLoftheserverfollowedbyMyDevicestoaccesstheMyDevicesportal,whichishowuserscanenrolltheirowndevicesintoProfileManager.Thisbringsupalistofprofilesthatcanbeinstalledmanually.
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EnrollingdevicesinProfileManager
TapontheEnrollbuttontoenrolladevice.Whenprompted,taponContinue:
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Installingprofiles
Youwillreceiveanerrorifyouareinstallingacertificatethathasn’tyetbeentrustedbyathird-partyCertificateAuthority(CA).Ascanbeseeninthefollowingscreenshot,clickontheInstallbutton:
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AcceptingunverifiedProfiles
Onceyou’reenrolled,clickonProfileintheProfilessectionoftheSettingsapptoseewhatsettingsaredeployedandoptionallyunenrolldevices.UserscanwipeorlocktheirowndevicesfromtheMyDevicesportaloradministratorscanmanagedevicesfromtheadministrativeportal.
DevicemanagementAsmentioned,youcanthenmanageiOSdevicesfromProfileManager.Thefirsttaskwe’llcoverhereisenforcingapasscodepolicyforagroupofdevices.Todoso,clickonDeviceGroupsinProfileManagerandselectagroupofdevices.
Acriticalaspectofanymanagementsolutionistoseetheinventoryinformation.TheinformationshownincludescertificatesinstalledbytheMDMsolution,UDID,LastCheckinTime,Wi-FiMAC,EthernetMACaddresses,DeviceModel,andwhetherthepersonalhotspotisenabled.YoucanalsoseetheappsthattheMDMsolutionhasinstalledandtherestrictionsthathavebeenenforcedbytheMDMsolution.
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PasscodepoliciesReal-timemanagementofdevicesisdoneusingtheDevicesscreen.Here,wecanaccessmachine-specificinformationandsettingsusingtheSettings(cog)button,aswellaswipeandlockdevices.Trytoalwaysusegroupstodeploypolicies,aswedohere.FromDeviceGroups,selectyourgroupandthenclickontheSettingstab.ClickontheEditbuttonshowninthenextscreenshot:
DeviceGroups
Sincewe’reconfiguringapasscodepolicy,clickonPasscode.Theitemsintheleftcolumnareknownaspayloads.ClickonConfiguretosetupthepasscodepayload.ChecktheboxandenableAllowsimplevalue,asshowninthefollowingscreenshot.Then,settheMinimumpasscodelengthoptiontoanumber.Wereallylikeusingfourcharacters.Then,clickontheOKbuttontosaveyourchanges.
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Configuringpasscoderequirements
Okay!Thatdidn’tsaveyourchangestotheprofile,onlytothatpayloadwithintheprofile.ClickontheSavebuttonontheSaveChanges?screentofinishtheprocess.You’llknoweverythingworkedwhenthedevicepromptsyouforanewpasscodeifoneisalreadyconfigured.
Wipingadeviceisanothercommonadministrativetask.Makesureyou’reusingadevicewhereyoudon’tmindlosingeverythingbeforeyoufollowalongwiththisexample.Towipeadevice,selectthedevicefromProfileManagerandthenclickontheSettings(cog)button,asyoudidearlier.Thistime,clickonWipe:
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Wipingadevice
WhentheWipescreencomesup,clickonWipe.Becausethisisdestructivetodataonthedevice,you’llbepromptedtoclickonWipeasecondtime.Ifyoulookatyourdevice,notethatitshouldinstantlygoblack,andthen,rebootthedevice.
TipIfthedeviceisDEP-enabled,itwillautomaticallybegintheenrollmentprocessagainonceitjoinsaWi-Finetworkforthefirsttime.
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IntroducingBushelIntheinterestoffulldisclosure,oneoftheauthorsofthisbookworksatJAMFSoftware,thecompanythatmakesBushel.Itisaverysimple,easy-to-useMDMthatallowsustoshowcase,usingathird-partysolution,tomakechangesondevicesusingthefewestnumberofscreenshotssowecanfitthemintothisbook.
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SetupYoucansetupaBushelaccountfromsignup.bushel.com.Whenpromptedforyourcompanyname,provideitasubdomainnameaswell,asshowninthefollowingscreenshot:
ConfiguringyourorganizationinBushel
Whentheformisfilledout,clickonNext.
Ontheinitialscreen,provideyourname,e-mailaddress,andapassword,asshowninthenextscreenshot.Theadministrativeusernamefortheaccountwillthenbethise-mailaddress.ClickontheCreateAccountbutton:
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ConfiguringyourBushelaccountsettings
Youwillreceiveane-mailfromBushel.ClickontheActivatebuttoninthee-mail.ClickonGetStartedandthenprovidethemailsettingsforyourdomainorclickontheSkipbuttontoprovidetheAPNscertificatesothatyoucanenrolliOSdevicesintoyourBushelaccount,asshownbelowinthefollowingscreenshot:
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TheenrollmentprocessTheenrollmentprocessissimilartoProfileManagerandotherthird-partyMDMtools.LogintoyourBushelaccount,clickonEnrollment,andwhenpromptedtoEnrollThisDevice,clickontheEnrollbutton.WhenpromptedWhowillthisdevicebelongto?entertheusername(thatistheuser’snameinfrontoftheire-mailaddress,mostlikely,ortheusernameforyoure-mailsystem).
Providethee-mailaddressaswell,andthenclickonEnrollThisDevice.Toenrollthedevice,usethedefaultsettingsateachscreen.Youcanalsosavethemobileconfigfiledownloaded(ifusingaMac)ande-mailortextittoallowausertoenrollwithoutvisitingawebsite.Youwillneedtoleavetheusernamefieldblankifyou’redistributingaprofiletomultiplepeople.
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RestrictionsApplebuiltafeaturecalledopeninmanagementiniOS.Thisfeatureprotectscompanydatainmailaccounts,apps,andevenSafarilinksdistributedbyanMDM.
OneexampleofopeninmanagementisifyoudownloadNumbersandBoxusingBushelandthenpurchaseDropboxusingyourpersonalAppleIDonthesamedevice,youcanthenopenadocumentthatcameinthroughNumbersusingBox.However,youcan’topenthatsamedocumentusingDropbox,becauseitwasnotsuppliedviatheMDMservice.
Bushelenablesopeninmanagementbydefaultonallaccounts.ThebuttonsaysProtectcorporatedataoniOSdevices.Toverifythatopeninmanagementisenabled,clickontheSetuptab.Then,clickonSecurityinthesidebarandlookforProtectcorporatedataoniOSdevices,asseeninthefollowingscreenshot:
Configurecorporatedataprotection
MakesureyouareusingVPPtodeployyourappsandverifythattheiOSdeviceisusingthemailaccountdeployedviayourMDM,ratherthanamanuallyconfiguredaccount.Tocheckthemailaccount,openSettings,taponMail,andverifythatthesettingsfoundtherecannotbechanged.WewillcovertheVolumePurchasingPrograminthenextsection.
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VolumePurchasingProgramandMDMVPPisaserviceprovidedbyApplethatallowsorganizationstopurchaseappsinvolume.AppspurchasedinVPPanddeployedthroughanMDMsolutioncanalsocontainerizedatatoonlyexchangedatawithappsdeployedbythatMDMsolution.Todeployanapp,simplyclickonAppsinthesidebar.Ifyouhavea.vpptokenfile(afileyougetfromtheAppleVPPportal),thenyouwillseetheappspurchasedusingtheAppleVPPportalinyourLibrary,asshownhere:
InstallationofAppsusingVPP
ClickonanappandthenclickontheInstallbuttontodeploytheapptoalldevicesenrolledinyourBushelaccount.ThentrytocopydataoutofthatappintotheonemanuallyinstalledfromtheAppStore.Providedthecopyfails,youhavesuccessfullybuiltawalledgardenforyourapp-baseddata.
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SummaryWedidalotinthischapter,whichisgreat.InChapter1,iOSSecurityOverview,welookedatconfiguringpasscodes,andinChapter2,IntroducingAppSecurity,welookedatappdata.Here,wemanagedbothwithverybasicpolicies,deployedbyinexpensiveandeasy-to-useMDMs.YoucangetalotofcomplicatedfunctionalitieswithyourMDM,ifyouchoose.Youcanalsodomuchmorewiththetoolsweprovidedinthischapter,sowehopeyouwillexploreeverythingthesetools(andtheotherthird-partyMDMsuites)havetooffer.
Inthenextchapter,we’llconcludethebookbyturningourattentiontotheinsidesofthedevice,divingintodebuggingtoolssoyoucandiveevendeeperintotheabyss,thatis,reverseengineeringhowthesethingswork.
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Chapter6.DebuggingandConclusionEveryenvironmentisdifferent.UnderstandingtheinternalworkingsofaniOSdeviceenablesyoutoisolateitemsthatyoumightconsidertobeasecuritythreatforyourparticularenvironmentthatwehaven’tidentifiedinthisbook.Inaddition,learningmoreaboutthesedevicesisjustplaincool!Inthischapter,we’regoingtolookatdebuggingandforensicdatacollection.Thesebothshowcasewhatkindofdatacanbepulledofffromdevicesandteachesyoumoreaboutthedevicesthatyou’resecuring.
Aswe’veshowcasedthroughoutthisbook,Appledoesagoodjobofprotectingsensitivedataondevices.Inaddition,applicationvendorshavealotoftoolstokeepyourdatasecureaswell.However,computersbeingwhattheyare,somedatacanbeobtainedfromthem.Inthischapter,we’regoingtocoverthefollowingtopics:
XcodeDivingdeeperintolibimobiledeviceAppcommunicationssuchasidentifyingdevicesandnetworkcommunicationsAppleIDsandApps
We’llbegoingthroughthecommontoolsfordebuggingiOS,reverseengineertoseehowthingsrununderthehood,andleveragethatdataforvarioususecases.ThisprocessstartswiththetoolthatAppleprovidesforwritingappsandthisiscalledXcode.
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XcodeXcodeiswrittenanddistributedforOSXbyApple.XcodeisusedtowriteappsforbothOSXandiOSanditcanbeusedtowritescriptsinvariouslanguages.Xcodealsocomeswithasuiteoftoolsthatcanbeusedtodebugtheappsthatyou’rewriting.Thesetoolscanalsobeusedtoviewlogsandwatchwhathappensondeviceswhenyou’reusingthem.
XcodeisavailableontheMacAppStoreathttps://itunes.apple.com/us/app/xcode/id497799835?mt=12,asyoucanseeinthefollowingscreenshot:
InstallXcodefromtheMacAppStore
InordertoinstallXcodefromtheMacAppStore,performthefollowingsteps:
1. ClickonInstallandwaitfortheinstallationtocompletetogetXcodeinstalledonyourcomputer.
2. Onceinstalled,openXcodefromthe/Applicationsdirectory.3. ChooseDevicesfromtheWindowmenutoseealistofdevicesthatthecomputer
canconnectto.4. Pluginthedevice.5. Clickonyourdevicetoseebasicinformationaboutthedeviceandthenclickonthe
ViewDeviceLogsbuttontoviewthedevicelogs,asshowninthefollowingscreenshot.
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TheXcodeDEVICESscreen
NoteNotethatatthebottomleftoftheDeviceInformationpaneisaShow/Hidebutton.Clickingonthisdisplaystheconsoleoftheconnecteddeviceinrealtime.
6. Thelogsarethendisplayed.Whentheyarereviewed,theselogsprovideawealthofinformationaboutdevices,asyoucanseeinthenextscreenshot.
7. Right-clickonalogandyoucandeleteitfromthedevicewithinXcode.Whenyouunplugthedevice,thelogwindowcloses.
TipNotethatyoucanalsoobtainXcodefromtheDeveloperportalofAppleifyouwouldrathernotusetheMacAppStoretodoso.
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iOSDeviceLogs
ManyofthesamelogscanbeviewedfromdifferentAppledevicesbyopeningtheSettingsappfromthehomescreen,taponPrivacy,tappingonDiagnostics&Usage,andthentaponDiagnostics&UsageData.Fromhere,youcantaponentriestoseethesamedebugginginformationthatisavailableinXcode,asshowninthefollowingscreenshot:
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DivedeeperwithlibimobiledeviceXcodeandothertoolscanbeusedtoviewlogsoniOSdevices.Anothertoolthatisusedtodebugdevicesiscalledlibimobiledevice.Thisisanopensourceprojectthatismeanttohelpsecurityresearchers,developers,andadministratorstrackthegoings-onofiOSdevices.Thelibimobiledevicelibraryisavailableathttp://www.libimobiledevice.org
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InstallinglibimobiledeviceusingHomebrewIusuallyinstalllibimobiledeviceusingHomebrew,asthereareafewdependenciesthatcanbealittleannoyingtoinstallotherwise.
ToinstallHomebrewifyouhaven’talreadydoneso,performthefollowingsteps:
1. Elevateyourprivilegesbyrunningsudoandinvokingabashshell:
sudobash
2. Runthefollowingcommand:
ruby-e"$(curl-fsSL
https://raw.githubusercontent.com/Homebrew/install/master/install)"
3. Oncethecommandisexecuted,followthepromptstocompletetheinstallation.OnceHomebrewisinstalled,runthefollowingbrewcommandtodownloadtherequiredcomponentsandthenlibimobiledevice:
brewinstall-v--freshautomakeautoconflibtoolwgetlibimobiledevice
4. Then,runideviceinstaller:
brewinstall-v--HEAD--fresh--build-from-sourceideviceinstaller
UsingidevicesyslogandidevicepairOncethesepairoftoolsareinstalled,youcanpluginapaireddevice,unlockit,andusethefollowingcommandtoviewthelogsonthescreen:
Idevicesyslog
Thisisakintorunningatailagainstthedevice.Again,thedevicemustbepaired.Youcanusethecommandline(forexample,ifyou’rerunningthisonLinux)toviewthelogs,butifyou’renotpaired,you’llneedtouseidevicepairtopairyourdevice,followedbythepairverb(whichisverydifferentfromthepearverb):
idevicepairpair
Youcanalsounpairadeviceusingtheunpaircommand:
idevicepairunpair
Whenpairingandunpairing,youshouldseetheappropriateentriesin/var/db/lockdown.
UsingidevicedateandideviceinstallerThenextoptionisdate(veryusefulwhenscriptingunittestsusingthissuite).Toobtainthis,usetheidevicedatecommand;youdonotneedanyoperatorsorverbs:
idevicedate
Next,let’schecktheappsinstalledonadevice.Wecandothiswiththeideviceinstallercommand(thatisalsopartoftheilibmobiledevicesuiteoftools).Here,we’llusethe-l
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optiontojustlistwhat’sinstalled:
/usr/local/bin/ideviceinstaller-l
Theoutputwouldshowtheappalongwiththeversionoftheappcurrentlyinstalledonthedevice:
com.apple.Pages-Pages1716
Touninstalloneofthelistedapps,usethe--uninstalloption:
ideviceinstaller--uninstallcom.protogeo.Moves
Youcanalsoinstallapps,providedyou’vecachedtheIPAfile(forexample,viaiTunes):
ideviceinstaller--install/Users/charlesedge/Music/iTunes/iTunes\Media/
Mobile\Applications/Box\3.3.0.ipa
NoteNotethattheprecedingfoldermaychangebasedontheoperatingsystemonwhichyourlibrarybeganwith.
Theprecedingcommandreturnsthefollowingoutput:
Copying'/Users/charlesedge/Music/iTunes/iTunesMedia/Mobile
Applications/Box3.3.0.ipa'todevice…DONE.
Installing'net.box.BoxNet'
Install-CreatingStagingDirectory(5%)
Install-ExtractingPackage(15%)
Install-InspectingPackage(20%)
Install-TakingInstallLock(20%)
Install-PreflightingApplication(30%)
Install-VerifyingApplication(40%)
Install-CreatingContainer(50%)
Install-InstallingApplication(60%)
Install-PostflightingApplication(70%)
Install-SandboxingApplication(80%)
Install-GeneratingApplicationMap(90%)
Install-Complete
Whenitisrunagainstadevice,theappcanthenopenotherapps,providedtheusertheAppleIDownstheapp.
Aprovisioningprofileisaprofilethatisusedtoinstallapps.TheseappsareusuallylocatedonamailserverthatsupportstheipaMIMEtypeandtheprofiledefinesthelocationtoobtaintheapp.ThisformsthebasisoftheWirelurkerattack,whereattackersreplaceanappbyspoofingthedomainoftheapp.There’salsoacommandforideviceprovisionthatcanbeusedtoviewinstalledprovisioningprofileswhentheyarerunwiththelistverb:
/usr/local/bin/ideviceprovisionlist
Asmentionedearlier,theideviceprovisioncommandcanalsoinstallaprovisioningprofile;thereforeitcanactuallymakethedeviceinstallanapp.Thisisdoneusingtheideviceprovisioncommandfollowedbytheinstallverbandthename(andpathifthe
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.mobileprovisionfileisn’tintheworkingdirectoryfromwhereyou’rerunningthecommand)ofthefilethatisbeinginstalled:
/usr/local/bin/ideviceprovisioninstallangrybirds.mobileprovision
YoucanalsoremovethepathoftheworkingdirectorybyfeedingintheUUIDoftheprovisioningprofilethatisobtainedbyusingthelistverbandreplacingMYUUIDfromthefollowingcodeblock:
/usr/local/bin/ideviceprovisionremoveMYUUID
YoucanalsoputadeviceinrecoverymodesothatitwouldneedtobepluggedintoacomputerthatisrunningiTunesandgetanewipswfileinstalled,whichisassimpleasfeedingtheUDIDintoideviceenterrecovery:
/usr/local/bin/ideviceenterrecovery
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Thisbringsupaninterestingquestion.HowwouldyougettheUDID?Youcanuseideviceinfotogetthis:
ideviceinfo
TheprecedingideviceinfooutputshowsmoreinformationaboutadevicethanwhatIknewyoucouldactuallygetpreviously.YoucanusegrepforUniqueDeviceIDasfollows:
ideviceinfo|grepUniqueDeviceID|awk'{print$2}'
ThiswouldjustreturntheUDID.Sincethisisblankwhennodeviceisconnectedtothesystem,youcanrunaloopthatwaitsforafewsecondswhentheUDIDisemptyandthenusesthatUDIDasa$1insomescripts.Ofcourse,it’smucheasiertouseacommandthatwasbuiltforthis,whichiscalledidevice_id:
idevice_id-l
Next,youcanuseidevicediagnosticstoobtainsomeinformationaboutthecurrentstateofthedevice:
idevicediagnosticsdiagnosticsAll-u
af36e5d7065d4ad666bf047b6e4de26dd1445789
TheidevicediagnosticscommandhasanXMLoutputwithinformationaboutthedevice,suchashowmuchbatterylifeisstillthere.Youcanalsoquerytheioregfileofthedevice,whichshowswhat’spluggedintothedevice:
idevicediagnosticsioregIODeviceTree-u
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Theidevicediagnosticscommandcanalsodosomebasictasks(whereeachtaskissentasaverbwithouttherequiredUDID)suchasrestart,sleep,andshutdown:
idevicediagnosticsrestart
Thecrashreportsonadevice(whichincludereportsofuninstalledappsthatforensicallyprovideaglimpseintowhatappswereremovedfromadeviceandwhentheywere
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removed)canbeextractedfromapaireddeviceaswell,usingidevicecrashreport:
idevicecrashreport-e/test
NoteTheprecedingdirectorymustexistpriortoexecutingthecommandandthecurrentusermusthavepermissiontowrite.
Youcanthenviewthelogsorgrepthroughthemforspecificpiecesofinformation:
cat/Test/Baseband/log-bb-2014-08-06-stats.plist
Thelastcommandthatwe’regoingtocoverinthissectionisidevicebackup2,whichisusedtobackupdevices.Here,we’regoingtofeedtheUDIDtoit.I’mlazilyusingtheidevice_idcommandfromearlier,inbackticks,tograbtheUDIDandbackitupinthat/testdirectorywhenthedeviceisunlocked.
idevicebackup2-u`idevice_id-l`backup/test
Here,we’vebackedupwhateverdeviceispluggedintothe/testdirectory.Thesubsequentbackupswillbeincremental.
Asyoucansee,thereareanumberoftasksthatcanbeperformedonadevicewhenthedevicehasbeenpairedtoacomputer.Thisfurtheremphasizesthefactthatyoushouldneverpairyourdevicetoanuntrustedcomputer.
YoucanalsousetheinformationobtainedfromthesecommandstotroubleshootandresearchawidevarietyofthingswithregardstodevicesbasedoniOS.Havingabackup,crashreports,andreal-timelogs,andmakingchangessuchasinstallingappsondevicesallowsyoutodoregressiontesting,vulnerabilityresearch,andalotmoreingeneralthatyouwouldn’tbeabletodootherwise.
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AppcommunicationsUpuntilnow,thischapterfocusedonviewingdataondevices,obtaininglogs,andmakingchangestodevicesthemselves.Sincelisteningtonetworktrafficisthebasisofmostofthereconnaissancethatisdoneondevices,we’lllookathowtoobtainmoreinformationaboutdevicesthatarebasedonwhatgoesoverthenetworkmedium.ThisisdonebyfirstidentifyingtheiOSdevicesonanetworkandthenlisteningtorawnetworktrafficusingcommontoolssuchasWireshark.
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IdentifyingdevicesForstarters,youcanidentifyalliOSdeviceseasilyastheylistenonport62078,whichisauniqueport.ToverifythataniOSdeviceisoccupyinganIPonanetwork,scantheIPaddressforthatport.Forexample,hereweusethebuilt-inportscannerinOSXtoscananIPaddressonthenetworkwithaniPhone:
/System/Library/CoreServices/Applications/Network\
Utility.app/Contents/Resources/stroke192.168.0.126207862078
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ListeningtonetworkcommunicationsOSXhasacommandcalledrvictlthatcanbeusedtoproxynetworkcommunicationsfromiOSdevicesthroughacomputeroverwhat’sknownasaRemoteVirtualInterface(RVI).TosetupanRVI,you’llneedtheUDIDofadeviceandthedevicewillneedtobepluggedintoaMacandhavethedevicepairedtotheMac.Thismayseemlikealot,butifyou’vefollowedwhatwehavebeendoinguntilnow,thisshouldbeprettysimple.
TosetupanRVI,we’llperformthefollowingsteps:
1. First,we’llpairadeviceusingthefollowingcommand:
idevicepairpair
2. Then,we’lltaponTrustonthedeviceitself.Then,we’llgrabthatUDIDwithidevice_id:
idevice_id-l
3. Next,we’llsetupanRVIwithrvictlandthe-soption(hereI’mjustgoingtograbtheUDIDsinceIonlyhaveonedevicepluggedintomycomputer):
rvictl-s`idevice_id-l`
4. Then,wecanlisttheconnectionsusingrvictlwiththe-loption:
rvictl-l
5. Next,we’llrunatcpdumpcommandusingthisnewlyconstructedrvi0:
tcpdump-n-irvi0
6. Next,we’llgetalotoflogs.Let’sfireuptheNikeFuelBandappandrefreshourstatus.Whilewatchingtheresultanttraffic,we’llseealinelikethis:
22:42:29.485691IP192.168.0.12.57850>54.241.32.20.443:Flags[S],
seq3936380112,win65535,options[mss1460,nop,wscale5,nop,nop,TS
val706439445ecr0,sackOK,eol],length0
There’sanIPinthisline—54.241.32.20.Wecanlookthisupandwe’llbeabletoseethattheserversaresittingonAmazonWebServices,andonverifyingit,wecometoknowthatit’sNike.Bywatchingthetrafficwithtcpdump,wecanobtainGET,POST,andotherinformationthatissentandreceived.UsingWireshark,wecangetevenmoredetaileddata.
Overall,thisbookismeanttofocusontheiOSsideofinformationsecurityandnotondebuggingandrefiningtheapproachtousingtcpdump/wireshark.ThervictltoolisagreattoolintheiOSdevelopmentcycleandforsecurityresearcherswhoarelookingintothenumberoftheappsoniOSdevicesthatexchangedata.
TipWhileI’vefoundthatrvictlisabletoshowmeprettymuchanythingIneedaccessto,if
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youfindanyissueswithit,gotohttps://github.com/libimobiledevice/usbmuxd.Thisisanopensourceprojectthatisbeingdevelopedmoreaggressivelyandcanbeusedtodosimilartasks.
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AppleIDsandAppsOneitemthatisnotoftencoveredwhenconsideringiOSsecurityistheAppleIDthatisusedtomanageadevice.TheAppleIDcanpotentiallybeusedtowipeadevice(forexample,viatheFindMyiPhoneapp),restoreadevice’sbackup,orevenviewthepurchasedmedia(songs,movies,iBooks,andapps)thatmaynotbeavailableonadevice.
Whenyouuninstallanapp,theappisstillinyourpurchasehistory.Asyoucanseeinthefollowingscreenshot,youcangetafairamountofinformationaboutwhatsomeoneusesadevicefor:
AppleIDsandPurchasedHistory
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TheonlywaytopreventsomeonefromlookingatsuchinformationistosecuretheAppleID.Usestrongpasswordsfortheseandchangethemfromtimetotime.Whenanemployeeleavesanorganization,youmightalsobeabletoresettheirpasswordusingane-mailaddressiftheAppleIDusesacorporatee-mailaddress.
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ForensicsSofar,we’vediscussedlookingatdataondevices.Whenyouuseadevice,unlessyoumadeaforensicimageofthedevicepriortousingit,youaretaintingevidence.Thisisnotabookonforensics,butwecanletyouknowaboutsometoolsthatwillallowyoutoacquireaforensicallysoundimageofadevicewithoutmuchfanfare.
NoteManyofthesetoolsareonlyavailabletolawenforcementprofessionals.Applehasrecentlygonetogreatlengthstomaketheirdevices“leak”lessdata,eventolawenforcement.SinceiOS7,it’sbeenpracticallyimpossibletobruteforcepasscodesandafterApplefixedthebootroomexploitsofiPhone4/iPad2,it’snolongerpossibletoobtainanimageofthedevice’sflashstorageforofflineanalysis.
ThefollowinglinksareavailabletohelpyouproperlyacquireevidencefromiOSdevicesandcomputersthataccessiOSdevices:
iOSForensicToolkit:http://www.elcomsoft.com/eift.htmlMobilyze:https://www.blackbagtech.com/mobilyze.htmlAccessDataForensicToolkit:http://www.elcomsoft.com/ios-forensic-toolkit.htmlLantern:https://katanaforensics.com/products/Blacklight:https://www.blackbagtech.com/forensics/blacklight/blacklight.htmliPhoneBackupAnalyzer:http://ipbackupanalyzer.com/Oxygen:http://www.oxygen-forensic.com/en/ForensicHardware:http://www.cellebrite.com/iXAM:http://www.ixam-forensics.com/devices.aspSecureView:http://mobileforensics.susteen.com/
TipManyofthesetoolscanalsobruteforcepasswordsthatareusedondevices.However,thismightbealengthyprocess.
Abasictoolthatdoesn’trequiretobepurchasedthroughlawenforcementbutcaninteractdirectlywithadeviceisiExplorerfromMacroplant.Thistooldoesnotexposeitemsthatareinsecureenclavesonthedevice,butitallowsyoutohavealotmoreaccessthanwhatyouwouldotherwisehave.iExplorerallowsyoutoviewContacts,Messages,Notes,Safari’shistory,backups,andsomeappdata.Asyoucanseeinthefollowingscreenshot,onceitisinstalled,youcanviewSafari’sbrowsinghistory:
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Macroplant’siExplorer
Asyoucanseeinthefollowingscreenshot,youcanalsoviewbooksandotherformsofmediainthefoldersinwhichtheseitemsarestoredonthedevice.Ausercanaccessthesefolderswithoutjailbreakingadevice.
ViewingiBooksData
Togofurtherintoadeviceandviewpreferences,operatingsystemfiles,andsoon,youwillneedtojailbreakitanduseatoolsuchasiFunBoxoriFileviaCydia,whichisanappstoreforjail-brokendevices.iFunBoxisaMac/Windowstoolforexaminingthedevice’sfilesystemandiFileisanappthatyoucaninstallonjail-brokendevices.SinceiOS7,
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you’llneedtoinstallahackedAppleFileConduit(AFC2)fromCydiaonajail-brokendevicetoaccessanythingoutsidethenormalsandboxedAFCareasofthedevice.(Seehttps://cydia.saurik.com/info/com.saurik.afc2d/formoreinformationonthis.)
TipFormoreinformationonjailbreakingdevices,searchforthetermJailbreakandalsoprovidethemodelofdeviceyouhaveonGoogle.Alotofsitesonjailbreakingcomeandgo,sowe’renotgoingtoincludealinkhere,butit’sworthcheckingouthowpeoplegoaboutsuchthingsandthelimitationsondevicesoncethey’rejail-broken.
www.it-ebooks.info
ApplicationsecurityEarlierinthischapter,wecoveredhowtoobtainmoreinformationabouthowapplicationscommunicatewithservers.Here,we’regoingtotakeabrieflookathowyoucanobtainmoreinformationaboutthedataand/orbinarieswithinanapp.Inapps,theseareusuallycompiled,soyouwillnottypicallyseerawsourcecode.Mostapplicationvendorswillnotprovideyouwithaccesstotheirsourcecodeeither.
IPAfilesarezippedapplicationbundles.Youcanunzipthembeforeattemptingtodisassemblethebinary.Todoso,youcanright-clickonanIPAfileandopenitwithArchiveUtilitytoquicklyunzipanappbundle.Insidetheresultingfolder,you’llseeaPayloadfolderthatcontainstheappitself.Onceyoucanseetheapp,youcanviewthepackagecontentsontheappbundleandlocatethebinaryfilewithin.Unfortunately,inmanycasesalthoughyoucanviewthestrings,attemptingtodisassembleaniOSappbinarywithatoollikeHoppercanbefruitlessbecauseappsfromtheAppStoreareusuallyencrypted.
Adhocandenterprisedistributionappscanbeexaminedwiththesetools;however,manyenterpriseappdevelopersuseobfuscationtechniquesorwrapperstoreducetheusefulnessofdisassemblyontheirproductionbinaries.
Insummary,thesedisassemblytechniquesprobablyaren’tusefultothereaderinanymeaningfulway.Unlessyouareanexperienceddeveloperwithsomeassemblylanguageknowledge,disassemblyofevenasimpleunencryptedbinaryofanysortisn’tlikelytohelpyoulearnanything.
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ViewinganAppThereareanumberoftoolsthatcanhelpyoutoobtainmoreinformationaboutanapp.Youcanuseacommandlinetoviewthecontentsofafile,andwhenitiscompiled,there’sstillafairamountofinformationthatcanbederivedfromaniOSapplicationfile(anIPAfile).Todothis,simplyusethecatcommandforafilefromyourapplibrary:
Cat/Users/charlesedge/Music/iTunes/iTunes\Media/Mobile\Applications/
Amex\4.6.0.ipa
Youcanalsoviewdatainthefilewithoutallthespecialcharactersusingthestringscommand:
Strings/Users/charlesedge/Music/iTunes/iTunes\Media/Mobile\
Applications/Amex\4.6.0.ipa
Therearealsodisassemblersthathavedifferentlevelsofluckinobtaininginformationaboutafile.Forexample,HopperDisassemblerthatcanbepurchasedfromtheMacAppStoreathttps://itunes.apple.com/us/app/hopper-disassembler/id422856039?mt=12.ThefollowingscreenshotshowstheHopperDisassembler:
HopperDisassembler
There’salsoatoolcalledClutch,whichisavailableonGitHubathttps://github.com/KJCracks/Clutch.Clutchmustberunfromajail-brokendevice,soitrequiresasomewhatthought-outmethodtodecompilecode;however,itisabletoobtainmoredatathananyothertoolthatwe’veseen.
Therearemanybooksthatareavailableonlinethatcanhelpyoutounderstandnativeprogramminglanguagesifyouaren’talreadyawareofthem.
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SummaryThereareanumberofplaceswherewestoppedourselvesfromwritingmoreinthischapter.Thischapterdoesnotprovidein-depthinformationaboutpacketcapturing,forensicacquisition,applicationdevelopment,oriOSsystemsinternals.Instead,similartotherestofthebook,wearepointingyoutowardsthenecessarycontenttodomoreifyouchoose.
Theauthorsofthisbookarestrongproponentsofthehackermentality.Therereallyisn’tmoresecurityinformationaboutdevicesthatareavailablewithoutjailbreakingdevicesoraccessingApple’sDeveloperportalathttp://developer.apple.com.Wedohopethatyouwilldothembothatsomepoint.Wedon’tbelievethatyoucanfullysecureajailbrokendevice,soyoushould,therefore,refrainfromputtingthemintoproduction.However,wealsobelieveinlearningasmuchaswecan,whichmeanseventuallyjailbreakingadeviceandseeingwhatreallymakesthoselittleSpeak-and-Spellappstick.
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IndexA
AccessDataForensicToolkitURL/Forensics
ActivationLockabout/ActivationLockandFindMyiPhonereferences/ActivationLockandFindMyiPhone
ActiveSyncabout/ActiveSyncmanagementsettings/ActiveSync
advancedoptions,SafariWebsiteData/Safariandbuilt-inAppprotectionsJavaScript/Safariandbuilt-inAppprotectionsWebInspector/Safariandbuilt-inAppprotections
AirDropabout/AirDrop
Always-Onabout/VPN(Always-On,APN,Per-App,On-Demand)
appsignatureverificationprocess/Installingappscommunication/AppcommunicationHandoffandContinuity/HandoffandContinuitydatastorage/SandboxingandAppdatastorageviewing/ViewinganApp
appcommunicationsabout/Appcommunicationsdevices,identifying/Identifyingdevicesnetworkcommunications/Listeningtonetworkcommunications
AppleURL,fordocumentation/ActivationLockandFindMyiPhone
AppleConfiguratorabout/AppleConfigurator,Apps,VPP,andAppleConfigurator,IntroducingMDMintendedworkflows/Intendedworkflowsinteractionmodes/Theinteractionmodes–Prepare,Supervise,andAssignsupervision,significance/Theimportanceofsupervisionmassrestoring/Massrestoringandnamingofdevicesdevices,naming/Massrestoringandnamingofdevicesbackupconcerns/Backupconcernsaschaperone/ConfiguratoraschaperoneversusDEP/DEPversusAppleConfiguratorversusMDM/ConfiguratorversusMDM
www.it-ebooks.info
AppleFileConduit(AFC2)about/Forensics
AppleIDsabout/AppleIDsandApps
ApplePushNotificationservice(APNs)about/IntroducingMDM
AppleTVabout/Abugorafeature?
applicationsecurityabout/Applicationsecurity
AppLockabout/SingleAppmode,AppLock,andGuidedAccessversusSingleAppMode/GuidedAccessversusAppLockversusSingleAppModeversusGuidedAccess/GuidedAccessversusAppLockversusSingleAppMode
appsinstalling/Installingappsstoreaccess,blocking/BlockingaccesstotheAppStoreabout/Apps,VPP,andAppleConfigurator,AppleIDsandApps
www.it-ebooks.info
BBackupkeybag/ViewingiOSdatainiTunesbackups
taking,iTunesused/TakingbackupsusingiTunesBlacklight
URL/Forensicsbuilt-inAppprotections
andSafari/Safariandbuilt-inAppprotectionsBushel
about/IntroducingBushelaccount,settingup/Setupenrollmentprocess/Theenrollmentprocessrestrictions/Restrictions
www.it-ebooks.info
Ccaching
about/GlobalHTTPProxy,caching,andthewebcontentfilterCertificateAuthority(CA)/PreparingtheProfileManagerServer,EnrollingintoProfileManagerCertificationAuthority(CA)/InstallingappsChaperoneCertificateIssuer/ConfiguratoraschaperoneChaperoneCertificateSerial/ConfiguratoraschaperoneClutch
about/ViewinganAppconfigurationfiles
about/ConfigurationprofilesContinuity
andHandoff/HandoffandContinuityCryptographicMessageSyntax(CMS)standard/Signing,encryption,anddelivery
www.it-ebooks.info
Ddelivery
about/Signing,encryption,anddeliveryDEP
about/DEPversusAppleConfiguratorversusAppleConfigurator/DEPversusAppleConfiguratorreferences/DEPversusAppleConfigurator
DEPusecases,AppleConfiguratorURL/DEPversusAppleConfigurator
devicebackingup/Backingupyourdevice
DeviceCertificateabout/Pairing
diagnosticsgathering/Lesser-knownwaysforAppletogatherdiagnostics
DigitalRightsManagement(DRM)/Installingapps
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Eencryption
about/Signing,encryption,anddeliveryEscrowBag
about/Pairingextensions
andkeyboards/Keyboardsandextensionsaccess,securing/Securingwhatextensionscanaccess
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FFindMyiPhonefeature/ActivationLockandFindMyiPhoneForensicHardward
URL/Forensicsforensics
about/Forensics
www.it-ebooks.info
GGlobalHTTPProxy
about/GlobalHTTPProxy,caching,andthewebcontentfilterGlobalServiceExchange/Lesser-knownwaysforAppletogatherdiagnosticsGroundControl
about/AddressingtheroughspotsURL/Addressingtheroughspots
GuidedAccessabout/SingleAppmode,AppLock,andGuidedAccessURL/SingleAppmode,AppLock,andGuidedAccessversusAppLock/GuidedAccessversusAppLockversusSingleAppModeversusSingleAppMode/GuidedAccessversusAppLockversusSingleAppMode
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HHandoff
andContinuity/HandoffandContinuityHealthapp/HealthappHomebrew
used,forinstallinglibimobiledevice/InstallinglibimobiledeviceusingHomebrew
Homebrew,forinstallinglibimobiledeviceidevicesyslog,usedfor/Usingidevicesyslogandidevicepairidevicepair,usedfor/Usingidevicesyslogandidevicepairidevicedate,usedfor/Usingidevicedateandideviceinstallerideviceinstaller,usedfor/Usingidevicedateandideviceinstaller
HostCertificateabout/Pairing
HostIDabout/Pairing
HostPrivateKeyabout/Pairing
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IiBackupExtractor/ViewingiOSdatainiTunesiCloudbackups
about/iCloudbackupsidevicediagnosticscommand/Usingidevicedateandideviceinstallerin-houseappdevelopment
about/Introductiontoin-houseAppdevelopmentinitialsecuritychecklist
about/Initialsecuritychecklistpasscode,configuring/Configuringapasscodeprivacysettings,configuring/Configuringprivacysettings
IntegratedDevelopmentEnvironment(IDE)/Installingappsinteractionmodes,AppleConfigurator
Prepare/Theinteractionmodes–Prepare,Supervise,andAssignSupervise/Theinteractionmodes–Prepare,Supervise,andAssignAssign/Theinteractionmodes–Prepare,Supervise,andAssign
iOSactivating/SecurebootandactivatingiOS
iOSConsoleURL/Configurationprofiles
iOSdataviewing,iniTunes/ViewingiOSdatainiTunes
iOSForensicToolkitURL/Forensics
iOSnetworkcommunicationabout/IntroductiontoiOSnetworkcommunication
iPhoneBackupAnalyzerURL/Forensics
iPhoneConfigurationUtility(iPCU)about/Configurationprofiles,AppleConfigurator
iTunesused,fortakingbackups/TakingbackupsusingiTunesiOSdata,viewingin/ViewingiOSdatainiTunes
iXAMURL/Forensics
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Kkeybag
about/Keybagsandkeychainskeyboards
andextensions/Keyboardsandextensionskeychains
about/Appcommunication,Keybagsandkeychains
www.it-ebooks.info
LLantern
URL/Forensicslibimobiledevice
about/DivedeeperwithlibimobiledeviceURL/Divedeeperwithlibimobiledeviceinstalling,Homebrewused/InstallinglibimobiledeviceusingHomebrew
www.it-ebooks.info
MMDM
URL/Abugorafeature?about/IntroducingMDMversusAppleConfigurator/ConfiguratorversusMDMandVPP/VolumePurchasingProgramandMDM
MDMProviders,comparisonreferencelink/TheProfileManager
MobileDeviceManagement(MDM)/SingleAppmode,AppLock,andGuidedAccessMobilyze
URL/Forensics
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OOnDemand
about/VPN(Always-On,APN,Per-App,On-Demand)openinmanagementfeature,iOS/RestrictionsOxygen
URL/Forensics
www.it-ebooks.info
Ppairing
about/PairingPassbook
about/PassbookandTouchIDforApplePaypasscode
configuring/ConfiguringapasscodeTodayoption/ConfiguringapasscodeNotificationsViewoption/ConfiguringapasscodeSirioption/ConfiguringapasscodePassbooktool/ConfiguringapasscodeReplywithMessagetool/Configuringapasscode
passcodepoliciesabout/Passcodepolicies
PaymentCardIndustry(PCI)about/Privacy-relatedconcerns
Per-Appabout/VPN(Always-On,APN,Per-App,On-Demand)
PINabout/PassbookandTouchIDforApplePay
predictivesearch/Predictivesearchandspotlightpreferencedomains
about/ConfigurationprofilesPrivacy&Securityoptions,Safari
DoNotTrack/Safariandbuilt-inAppprotectionsBlockCookies/Safariandbuilt-inAppprotectionsFraudulentWebsiteWarning/Safariandbuilt-inAppprotectionsClearHistoryandWebsiteData/Safariandbuilt-inAppprotectionsUseCellularData/Safariandbuilt-inAppprotections
privacy-relatedconcernsabout/Privacy-relatedconcerns
ProfileManagerabout/TheProfileManagerpreparing/PreparingProfileManagerPostConfigurationtasks,completing/CompletingPostConfigurationtasksusing/UsingProfileManagerenrollinginto/EnrollingintoProfileManagerdevicemanagement/Devicemanagementpasscodepolicies/Passcodepolicies
ProfileManagerServerpreparing/PreparingtheProfileManagerServer
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RRecBoot/ActivationLockandFindMyiPhonerecoverymode/ActivationLockandFindMyiPhonereflector
URL/SingleAppmode,AppLock,andGuidedAccessRemoteVirtualInterface(RVI)
about/Listeningtonetworkcommunicationssettingup/Listeningtonetworkcommunications
RootCertificateabout/Pairing
RootPrivateKeyabout/Pairing
www.it-ebooks.info
SSafari
andbuilt-inAppprotections/Safariandbuilt-inAppprotectionsSafaripreferences,forsecuringiOSdevices
Passwords&AutoFill/Safariandbuilt-inAppprotectionsFavorites/Safariandbuilt-inAppprotectionsOpenLinks/Safariandbuilt-inAppprotectionsBlockPop-ups/Safariandbuilt-inAppprotections
sandboxingabout/SandboxingandAppdatastorage
securebootchainabout/SecurebootandactivatingiOS
SecureEnclaveabout/SecurebootandactivatingiOS
SecureViewURL/Forensics
signingabout/Signing,encryption,anddelivery
SingleAppModeversusGuidedAccess/GuidedAccessversusAppLockversusSingleAppModeversusAppLock/GuidedAccessversusAppLockversusSingleAppMode
SingleAppmodeabout/SingleAppmode,AppLock,andGuidedAccess
spotlight/PredictivesearchandspotlightSupervision
about/VPN(Always-On,APN,Per-App,On-Demand)SystemBUID
about/Pairingsystemscope/ConfigurationprofilesSystemSoftwareAuthorization
about/SecurebootandactivatingiOS
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Vverifiedboot
about/SecurebootandactivatingiOSVPNOnDemand
about/VPN(Always-On,APN,Per-App,On-Demand)VPP
about/AppleConfigurator,Apps,VPP,andAppleConfigurator,CompletingPostConfigurationtasks,VolumePurchasingProgramandMDMandMDM/VolumePurchasingProgramandMDM
www.it-ebooks.info
Wwebcontentfilter
about/GlobalHTTPProxy,caching,andthewebcontentfilterWiFiMACAddress
about/Pairing
www.it-ebooks.info
XXcode
about/XcodeURL/Xcodeinstalling/Xcode
XPC/Securingwhatextensionscanaccess
www.it-ebooks.info
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