Code Injection on ios 8 for the Greater Good. Alban Diquet Angela Chow Eric Castro
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1 TrustKit Code Injection on ios 8 for the Greater Good Alban Diquet Angela Chow Eric Castro
2 About Us Alban: Engineering/security lead at Data Theorem Eric: ios R&D at Data Theorem Angela: Paranoids (security) at Yahoo
3 Agenda TrustKit: effortless SSL pinning for ios and OS X Dynamic libraries and ios 8 Function hooking on a non-jailbroken device
4 Agenda TrustKit: effortless SSL pinning for ios and OS X Dynamic libraries and ios 8 Function hooking on a non-jailbroken device
5 TrustKit Goal: Create an SSL pinning library for ios Needed a usable solution that works in real-world Apps Collaborated with the Yahoo mobile & security teams
6 SSL Pinning at Yahoo Goal: SSL pinning for Yahoo s mobile Apps Easy project, right? But... Technical challenges: What and how to pin? Operational challenges: How to get buy-in from management?
7 SSL Pinning at Yahoo Goal: SSL pinning for Yahoo s mobile Apps Easy project, right? But... Technical challenges: What and how to pin? Operational challenges: How to get buy-in from product team?
8 Technical Challenges What to pin? Certificate or public key? Best practice is Subject Public Key Info No API on ios to extract SPKI from a certificate Most libraries and examples are doing it wrong Comparing the whole certificate or public key
9 Technical Challenges How to pin? Find and modify every single instance of NSURLConnection, NSURLSession? Or better: use method swizzling Problem: no public API for customizing certificate validation in UIWebView Not even swizzling would work
10 Operational Challenges How to get buy-in from the product team? Blocking attackers is a good cause but... What if we block the wrong connections? Answer: a report-only mode Shows what connections would be blocked and why Easier to decide on whether pinning should be enforced or not
11 Operational Challenges How to get buy-in from the product team? Blocking attackers is a good cause but... What if we block the wrong connections? Answer: a report-only mode Shows what connections would be blocked and why Easier to decide on whether pinning should be enforced or not
12 Operational Challenges How to get buy-in from the product team? Blocking attackers is a good cause but... What if we block the wrong connections? Answer: a report-only mode Shows what connections would be blocked and why Easier to decide on whether pinning should be enforced or not
13 SSL Pinning at Yahoo No existing ios library supported any of these requirements SPKI pinning Report-only mode Easy to deploy but works on all networking APIs Met with Data Theorem and started a collaboration :)
14 TrustKit We solved these challenges TrustKit works transparently on all Apple APIs Easy configuration: set the pinning policy in the Info.plist Settings are heavily based on HTTP Public Key Pinning SPKI pinning: Developer needs to specify the key algorithm Report-only mode Format similar to HPKP for pin failure reports
15 TrustKit We solved these challenges TrustKit works transparently on all Apple APIs Easy configuration: set the pinning policy in the Info.plist Settings are heavily based on HTTP Public Key Pinning SPKI pinning: Developer needs to specify the key algorithm Report-only mode Format similar to HPKP for pin failure reports
16 ios Network Stack AFNetworking HTTP NSURLConnection HTTP NSURLSession HTTP (ios 7+) UIWebView Web View CFNetwork Networking BSD Sockets Networking SecureTransport SSL/TLS
17 ios Network Stack AFNetworking HTTP NSURLConnection HTTP NSURLSession HTTP (ios 7+) UIWebView Web View CFNetwork Networking TrustKit BSD Sockets Networking SecureTransport SSL/TLS
18 ios Network Stack AFNetworking HTTP NSURLConnection HTTP NSURLSession HTTP (ios 7+) UIWebView Web View CFNetwork Networking TrustKit BSD Sockets Networking SecureTransport SSL/TLS
19 TrustKit We solved these challenges TrustKit works transparently on all Apple APIs Easy configuration: set the pinning policy in the Info.plist Settings are heavily based on HTTP Public Key Pinning SPKI pinning: Developer needs to specify the key algorithm Report-only mode Format similar to HPKP for pin failure reports
20 TrustKit We solved these challenges TrustKit works transparently on all Apple APIs Easy configuration: set the pinning policy in the Info.plist Settings are heavily based on HTTP Public Key Pinning SPKI pinning: Developer needs to specify the key algorithm Report-only mode Format similar to HPKP for pin failure reports
21 TrustKit We solved these challenges SPKI pinning: Developer needs to specify the key algorithm Easy configuration Heavily based on HTTP Public Key Pinning Works on all Apple APIs Report-only mode Format similar to HPKP for pin failure reports
22 TrustKit We solved these challenges TrustKit works transparently on all Apple APIs Easy configuration: set the pinning policy in the Info.plist Settings are heavily based on HTTP Public Key Pinning SPKI pinning: Developer needs to specify the key algorithm Report-only mode Format similar to HPKP for pin failure reports
23 TrustKit We solved these challenges TrustKit works transparently on all Apple APIs Easy configuration: set the pinning policy in the Info.plist Settings are heavily based on HTTP Public Key Pinning SPKI pinning: Developer needs to specify the key algorithm Report-only mode Format similar to HPKP for pin failure reports
24 TrustKit We solved these challenges TrustKit works transparently on all Apple APIs Easy configuration: set the pinning policy in the Info.plist Settings are heavily based on HTTP Public Key Pinning SPKI pinning: Developer needs to specify the key algorithm Report-only mode Format similar to HPKP for pin failure reports
25 TrustKit { "port":443, "include-subdomains":true, "noted-hostname":"domain.com", hostname":"test.domain.com", app-bundle-id :"com.test.testapp", "validated-certificate-chain": ["-----BEGIN CERTIFICATE---- \nmiilyjcccrkgawibagiqqcm82qxxnzszqtblpwpahdanbgkqhkig9w0baqufadcb\r \nttelmakga1uebhmcvvmxfzavbgnvbaotdlzlcmltawdulcbjbmmumr8whqydvqql\r... \nwkn/i4qtce3vmxp8o17ckqegvaei5nvfhca4r4f8mnyouyt+6j07sxya5cdsxq==\n -----END CERTIFICATE-----",... "-----BEGIN CERTIFICATE----- \nmiie0zcca7ugawibagiqgnrrniz96ltkivjnzgs7sjanbgkqhkig9w0baqufadcb\r... LPKsEdao7WNq\n-----END CERTIFICATE-----"], "date-time":" t18:12:30z", "known-pins": [ "pin-sha256=\"jbqbug5jmjuoi6brnx0x3vzf6jilxsapbxgvfjhn8fg=\"", pin-sha256=\"woiwryiovna9ihabcirsc7xhjliys9vwugoiud4pb18=\"" ], app-version":"2413" }
26 TrustKit We solved these challenges TrustKit works transparently on all Apple APIs Easy configuration: set the pinning policy in the Info.plist Settings are heavily based on HTTP Public Key Pinning SPKI pinning: Developer needs to specify the key algorithm Report-only mode Format similar to HPKP for pin failure reports
27 Demo
28 TrustKit We re open sourcing TrustKit today MIT License Also works in OS X Apps More on this at the end
29 TrustKit So how does TrustKit work? Leveraged techniques usually used on jailbroken ios Code injection Low-level C function hooking Could be applied to other things than SSL pinning
30 How It All Started ios 8 released: dynamic libraries now allowed in App Store Apps! Lots of experience building Cydia tweaks Dynamic libraries that modify Apps at runtime Used for customization and security research Leverages function hooking and code injection Can we use the same techniques within an ios 8 App Store App on a non-jailbroken device?
31 How It All Started ios 8 released: dynamic libraries now allowed in App Store Apps! Lots of experience building Cydia tweaks Dynamic libraries that modify Apps at runtime Used for customization and security research Implemented by hooking functions and methods Can we use the same techniques within an ios 8 App Store App on a non-jailbroken device?
32 How It All Started ios 8 released: dynamic libraries now allowed in App Store Apps! Lots of experience building Cydia tweaks Dynamic libraries that modify Apps at runtime Used for customization and security research Implemented by hooking functions and methods Can we use the same techniques within an ios 8 App Store App on a non-jailbroken device?
33 How It All Started ios 8 released: dynamic libraries now allowed in App Store Apps! Lots of experience building Cydia tweaks Dynamic libraries that modify Apps at runtime Used for customization and security research Implemented by hooking functions and methods Can we use the same techniques within an ios 8 App Store App on a non-jailbroken device?
34 How It All Started ios 8 released: dynamic libraries now allowed in App Store Apps! Lots of experience building Cydia tweaks Dynamic libraries that modify Apps at runtime Used for customization and security research Implemented by hooking functions and methods Can we use the same techniques within an ios 8 App Store App on a non-jailbroken device?
35 How It All Started ios 8 released: dynamic libraries now allowed in App Store Apps! Lots of experience building Cydia tweaks Dynamic libraries that modify Apps at runtime Used for customization and security research Implemented by hooking functions and methods Can we use the same techniques within an ios 8 App Store App on a non-jailbroken device?
36 How It All Started ios 8 released: dynamic libraries now allowed in App Store Apps! Lots of experience building Cydia tweaks Dynamic libraries that modify Apps at runtime Used for customization and security research Implemented by hooking functions and methods Can we use the same techniques within an ios 8 App Store App on a non-jailbroken device?
37 Agenda TrustKit: effortless SSL pinning for ios and OS X Dynamic libraries and ios 8 Function hooking on a non-jailbroken device
38 Agenda TrustKit: effortless SSL pinning for ios and OS X Dynamic libraries and ios 8 Function hooking on a non-jailbroken device
39 Dylibs Before ios 8 Historically: no third-party dynamic libraries in Apps System dylibs packaged with the OS Developer libraries: static linking only Enforced via the App Store review process
40 Dylibs Before ios 8 Historically: no third-party dynamic libraries in Apps System dylibs packaged with the OS Developer libraries: static linking only Enforced via the App Store review process
41 Dylibs on ios 8 ios 8: dynamic libraries now accepted Apple calls them Embedded Frameworks Introduced to facilitate sharing code between Apps and their App Extensions But can be used regardless of whether the App actually has an Extension
42 Dylibs on ios 8
43 Dylibs on ios 8 A dynamic library dependency is created in the Mach-O binary in a load command structure Mach-O is the binary file format for programs and libraries in ios and OS X Executables interact with dyld to load their library dependencies at runtime.
44 Dylibs on ios 8 Sandboxing forces our dependencies to be packaged within the app s bundle dyld uses prefixes inside the load command to locate points to the full path where the main executable is (the.app defines library search path locations In seems limited to one single location (a Frameworks directory inside app s bundle)
45 Dylibs on ios 8 Sandboxing forces our dependencies to be packaged within the app s bundle dyld uses prefixes inside the load command to locate points to the full path where the main executable is (the.app defines library search path locations In seems limited to one single location (a Frameworks directory inside app s bundle)
46 Dynamic Libraries
47 Dynamic Libraries
48 Dylib Constructors Dynamic libraries can have constructors Basically a C function that is called when the library is loaded in memory We use it to initialize our hooks (patches) and settings attribute ((constructor)) static void initializer()
49 Dylibs Recap By adding to the App a load command with our dylib The dylib will be automatically loaded when the App starts The dylib s constructor will be run first Takes care of the injection" process Can we create a dylib that does C function hooking?
50 Dylibs Recap By adding to the App a load command with our dylib The dylib will be automatically loaded when the App starts The dylib s constructor will be run first Takes care of the injection" process Can we create a dylib that does C function hooking?
51 Dylibs Recap By adding to the App a load command with our dylib The dylib will be automatically loaded when the App starts The dylib s constructor will be run first Takes care of the injection" process Can we create a dylib that does C function hooking?
52 Agenda TrustKit: effortless SSL pinning for ios and OS X Dynamic libraries and ios 8 Function hooking on a non-jailbroken device
53 Hooking Jailbreak-Free First attempt Tried packaging an actual Cydia Substrate tweak into an App Store App Failed: no way to package a Substrate tweak in an App Store App due to RWX requirement
54 Substrate in an App Hardware Model: iphone6,1 Process: TestSubstrate [1438] Path: /private/var/mobile/containers/bundle/application/af0e2fd7-ba47-4e57-95ed- B2C3D6116E62/TestSubstrate.app/TestSubstrate Identifier: TestSubstrate Version:??? Code Type: ARM-64 (Native) Parent Process: launchd [1] Date/Time: :57: Launch Time: :57: OS Version: ios 8.4 (12H143) Report Version: 105 Exception Type: EXC_BAD_ACCESS (SIGKILL - CODESIGNING) Exception Subtype: unknown at 0x b346c4 Triggered by Thread: 0 Thread 0 name: Dispatch queue: com.apple.main-thread Thread 0 Crashed: 0 CydiaSubstrate 0x bc 0x SSLKillSwitch.dylib 0x d30 0x dyld 0x d234 0x12005c dyld 0x d3ec 0x12005c [...]
55 Substrate in an App Hardware Model: iphone6,1 Process: TestSubstrate [1438] Path: /private/var/mobile/containers/bundle/application/af0e2fd7-ba47-4e57-95ed- B2C3D6116E62/TestSubstrate.app/TestSubstrate Identifier: TestSubstrate Version:??? Code Type: ARM-64 (Native) Parent Process: launchd [1] Date/Time: :57: Launch Time: :57: OS Version: ios 8.4 (12H143) Report Version: 105 Exception Type: EXC_BAD_ACCESS (SIGKILL - CODESIGNING) Exception Subtype: unknown at 0x b346c4 Triggered by Thread: 0 Thread 0 name: Dispatch queue: com.apple.main-thread Thread 0 Crashed: 0 CydiaSubstrate 0x bc 0x SSLKillSwitch.dylib 0x d30 0x dyld 0x d234 0x12005c dyld 0x d3ec 0x12005c [...]
56 Substrate in an App Hardware Model: iphone6,1 Process: TestSubstrate [1438] Path: /private/var/mobile/containers/bundle/application/af0e2fd7-ba47-4e57-95ed- B2C3D6116E62/TestSubstrate.app/TestSubstrate Identifier: TestSubstrate Version:??? Code Type: ARM-64 (Native) Parent Process: launchd [1] Date/Time: :57: Launch Time: :57: OS Version: ios 8.4 (12H143) Report Version: 105 Exception Type: EXC_BAD_ACCESS (SIGKILL - CODESIGNING) Exception Subtype: unknown at 0x b346c4 Triggered by Thread: 0 Thread 0 name: Dispatch queue: com.apple.main-thread Thread 0 Crashed: 0 CydiaSubstrate 0x bc 0x SSLKillSwitch.dylib 0x d30 0x dyld 0x d234 0x12005c dyld 0x d3ec 0x12005c [...]
57 Substrate in an App Hardware Model: iphone6,1 Process: TestSubstrate [1438] Path: /private/var/mobile/containers/bundle/application/af0e2fd7-ba47-4e57-95ed- B2C3D6116E62/TestSubstrate.app/TestSubstrate Identifier: TestSubstrate Version:??? Code Type: ARM-64 (Native) Parent Process: launchd [1] Date/Time: :57: Launch Time: :57: OS Version: ios 8.4 (12H143) Report Version: 105 Exception Type: EXC_BAD_ACCESS (SIGKILL - CODESIGNING) Exception Subtype: unknown at 0x b346c4 Triggered by Thread: 0 Thread 0 name: Dispatch queue: com.apple.main-thread Thread 0 Crashed: 0 CydiaSubstrate 0x bc 0x MSFunctionHook() 1 SSLKillSwitch.dylib 0x d30 0x Dylib Contructor 2 dyld 0x d234 0x12005c dyld 0x d3ec 0x12005c [...]
58 Substrate in an App SIGKILL when calling MSFunctionHook() Substrate hooks C functions by patching the function s prologue This requires RWX memory pages Not possible on a non-jailbroken device Unless running in a debugger
59 Substrate in an App SIGKILL when calling MSFunctionHook() Substrate hooks C functions by patching the function s prologue This requires RWX memory pages Not possible on a non-jailbroken device Unless running in a debugger
60 Hooking Jailbreak-Free First attempt Tried packaging an actual Cydia Substrate tweak into an App Store App Failed: no way to package a Substrate tweak in an App Store App due to RWX requirement
61 Hooking Jailbreak-Free First attempt Tried packaging an actual Cydia Substrate tweak into an App Store App Failed: no way to package a Substrate tweak in an App Store App due to RWX requirement
62 Hooking Jailbreak-Free Second attempt DYLD_INSERT_LIBRARIES and interpose Similar to LD_PRELOAD on Linux Symbol rebinding: can only override exported functions Requires setting an environment variable Failed: can t be done in an App Store App outside of Xcode
63 Hooking Jailbreak-Free Second attempt DYLD_INSERT_LIBRARIES and interpose Similar to LD_PRELOAD on Linux Symbol rebinding: can only override exported functions Requires setting an environment variable Failed: can t be done in an App Store App outside of Xcode
64 Hooking Jailbreak-Free Third attempt Newer libraries for dynamic symbol rebinding comex/substitute Specifically substitute_interpose_imports() facebook/fishhook Success: We were able to create a dylib to automatically hook functions in an App Store App
65 Hooking Jailbreak-Free Third attempt Newer libraries for dynamic symbol rebinding comex/substitute Specifically substitute_interpose_imports() facebook/fishhook Success: We were able to create a dylib to automatically hook functions in an App Store App
66 Hooking Jailbreak-Free Third attempt Newer libraries for dynamic symbol rebinding comex/substitute Specifically substitute_interpose_imports() facebook/fishhook Success: We were able to create a dylib to automatically hook functions in an App Store App
67 Hooking Jailbreak-Free Third attempt Newer libraries for dynamic symbol rebinding comex/substitute Specifically substitute_interpose_imports() facebook/fishhook Success: We were able to create a dylib to automatically hook functions in an App Store App
68 Hooking Jailbreak-Free Third attempt Newer libraries for dynamic symbol rebinding comex/substitute Specifically substitute_interpose_imports() facebook/fishhook Success: We were able to create a dylib to automatically hook functions in an App Store App
69 Putting It All Together One concrete example: TrustKit for SSL pinning Adding TrustKit to the App s Xcode project: Embeds the dylib in the App s bundle Adds a load command to the App s executable
70 Putting It All Together The TrustKit dylib s constructor does all the work: Reads the pinning policy from the App s Info.plist Sets up the SecureTransport hooks Runtime patch for SSLHandshake() Uses facebook/fishhook for C function hooking No need to modify the App s source code or call a TrustKit initialization method!
71 Putting It All Together The TrustKit dylib s constructor does all the work: Reads the pinning policy from the App s Info.plist Sets up the SecureTransport hooks Runtime patch for SSLHandshake() Uses facebook/fishhook for C function hooking No need to modify the App s source code or call a TrustKit initialization method!
72 Conclusion We re open-sourcing TrustKit today - MIT license Supports ios 7+ and OS X TrustKit is already live in a Yahoo App on the App Store Partnered with other companies who will deploy it in their OS X and ios Apps Feedback, comments and pull requests very welcome!
73 One Last Thing SSL pinning can be a challenge for security researchers And is not designed to block an attacker running code as root on the device So I also released SSL Kill Switch 2 Added support for TrustKit Apps (and OS X)
74 Thanks!
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