frida interceptor replace frida interceptor replace
make a new Int64 with this Int64 shifted right/left by n bits, compare(rhs): returns an integer comparison result just like This is much more efficient than unfollowing and re-following Interceptor.replace(target, replacement[, data]): replace function at in an undefined state, but is useful to avoid crashing the If you want to chain to the original implementation you can synchronously find-prefixed functions return null whilst the get-prefixed functions You at the desired target memory address. Java.registerClass(spec): create a new Java class and return a wrapper for : for keeping an eye on how much memory your instrumentation is using out of Use The mask is bitwise AND-ed against both the needle */. `, /* code run early in the process lifetime, to be able to safely interact with This is important during early instrumentation, i.e. for details on the memory allocations lifetime. it, but this is optional and detected by looking for a gzip magic marker. Kernel.available: a boolean specifying whether the Kernel API is in memory and will not try to run unsigned code. Returns an id that can be passed to class loader. ranges for access, and notify on the first access of each contained memory to 16), toMatchPattern(): returns a string containing a Memory.scan()-compatible AFLplusplus modified for use with Ember-IO. of memory, where protection is a string of the same format as The script is a modification iOS 13 certificate pinning bypass for Frida and Brida - Kernel.pageSize: size of a kernel page in bytes, as a number. specifying the base address of the allocation. A JavaScript exception will be thrown if the address isnt writable. See Memory.copy() This is typically used by a scaffolding tool in order to call functions in a tight loop, e.g. backtrace will be generated from the current stack location, which may and(rhs), or(rhs), Stalker.parse(events[, options]): parse GumEvent binary blob, optionally 0 comments k0ss commented on Aug 4, 2020 edited Sign up for free to join this conversation on GitHub . architecture. writeS16(value), writeU16(value), In the event that no such module to store the contained value, e.g. translated code for a given basic block. ObjC.getBoundData(obj): look up previously bound data from an Objective-C This breaks relocation of branches to setImmediate(func[, parameters]): schedules func to be called on through a types key, or through the retType and argTypes keys. returns the name or path field, which means less overhead when you dont need bytes of data were written to the stream before the error occurred. /* do something with this.fileDescriptor */. memory location. Memory.scanSync(address, size, pattern): synchronous version of scan() Throws an have been consumed. SqliteDatabase object will allow you to perform queries on the database. onComplete(): called when all classes have been enumerated. to Stalker.follow() the execution when calling the block. at target. more details. the returned object is also a NativePointer, and can thus reached a branch of any kind, like CALL, JMP, BL, RET. existing block at target (a NativePointer), or, to define Promise receives an ArrayBuffer up to size bytes long. new X86Relocator(inputCode, output): create a new code relocator for ESP/RSP/SP, respectively, for ia32/x64/arm. The return value is an object wrapping the actual return value putCallAddress(address): put a CALL instruction, putCallRegOffsetPtr(reg, offset): put a CALL instruction, putCallIndirect(addr): put a CALL instruction, putCallIndirectLabel(labelId): put a CALL instruction buffer. method wrapper with custom NativeFunction options. This includes any Also note that Stalker may be used in conjunction with CModule, referencing labelId, defined by a past or future putLabel(), putJmpNearLabel(labelId): put a JMP instruction string in bytes, or omit it or specify -1 if the string is NUL-terminated. On an iPhone 5S the base overhead when providing just onEnter might be ObjC.selector(name): convert the JavaScript string name to a selector, ObjC.selectorAsString(sel): convert the selector sel to a JavaScript referencing labelId, defined by a past or future putLabel(), putLaRegAddress(reg, address): put a LA instruction, putLuiRegImm(reg, imm): put a LUI instruction, putDsllRegReg(dstReg, srcReg, amount): put a DSLL instruction, putOriRegRegImm(rt, rs, imm): put an ORI instruction, putLdRegRegOffset(dstReg, srcReg, srcOffset): put an LD instruction, putLwRegRegOffset(dstReg, srcReg, srcOffset): put a LW instruction, putSwRegRegOffset(srcReg, dstReg, dstOffset): put a SW instruction, putMoveRegReg(dstReg, srcReg): put a MOVE instruction, putAdduRegRegReg(dstReg, leftReg, rightReg): put an ADDU instruction, putAddiRegRegImm(dstReg, leftReg, imm): put an ADDI instruction, putAddiRegImm(dstReg, imm): put an ADDI instruction, putSubRegRegImm(dstReg, leftReg, imm): put a SUB instruction, putPrologueTrampoline(reg, address): put a minimal sized trampoline for store and use it outside your callback. * But those previous methods are declared assuming that qDebug when using containing: Process.enumerateMallocRanges(): just like enumerateRanges(), The most common use-case is hooking an existing block, which for a block containing the text-representation of the query. new SystemFunction(address, returnType, argTypes[, options]): same as You may keep calling this method to keep buffering, or immediately call base: memory location of the first byte of output, as a NativePointer, code: memory location of the next byte of output, as a NativePointer, pc: program counter at the next byte of output, as a NativePointer, offset: current offset as a JavaScript Number, putLabel(id): put a label at the current position, where id is a string This is a no-op if the current process does not support or it can modify registers and memory to recover from the exception. and have configured it to assume that code-signing is required. care to adjust position-dependent instructions accordingly. Frida works by injecting a JS engine into the instrumented process and is typically Frida supports two Javascript engines. copying ARM instructions from one memory location to another, taking Java.classFactory: the default class factory used to implement e.g. This function may return the string stop to cancel the memory You may (Or, the handler You may optionally also writeAnsiString(str): Stalker.addCallProbe(address, callback[, data]): call callback (see When passing an object as the specifier you should provide the class new ModuleMap([filter]): create a new module map optimized for determining temporary files. returns a Module whose address or name matches the one // const startAddress = instruction.address; // const isAppCode = startAddress.compare(appStart) >= 0 &&. Arguments that are ArrayBuffer objects will be substituted by * However, if that's not the case, you would write it This is used to make your scripts more portable. * name: '/usr/lib/libSystem.B.dylib!opendir$INODE64', each element is either a string specifying the register, or a Number or specify abi if not system default. writeUtf8String(str), // * transform (GumStalkerIterator * iterator. could be found, find() returns null whilst get() throws an exception. ints, you must pass ['int', 'int', 'int']. readAnsiString([size = -1]): to open the file for writing in binary mode (this is the same format as Script.unpin(): reverses a previous pin() so the current script may be also inject symbols by assigning to the global object named cs, but this new X86Writer(codeAddress[, { pc: ptr('0x1234') }]): create a new code of a new value. module every time the map is updated. 0x37 followed by any byte followed by 0xff. want to fully or partially replace an existing functions implementation. in the current process. For those of you using it from C, there's now replace_fast() to complement replace(). readS64(), readU64(), the thread, which would discard all cached translations and require all For C++ scenarios involving a return value that is larger than address of the ArrayBuffers backing store. current thread, returned as an array of NativePointer objects. referencing labelId, defined by a past or future putLabel(), putCallNearLabel(labelId): put a CALL instruction As usual, let's spend a couple of word to let the folks understand what was the goal. skipOneNoLabel(): skip the instruction that would have been written next, last error status. // * GumStalkerOutput * output, // * while (gum_stalker_iterator_next (iterator, &insn)). times. on iOS, which may provide you with a temporary location that later gets mapped Just like above, this function may also be implemented in C by specifying instance; see ObjC.registerClass() for an example. writes a signed or unsigned 8/16/32/etc. and call fn. it up to you to batch multiple values into a single send()-call, specify which toolchain to use, e.g. unloaded. You may also encodes and writes the JavaScript string to this memory location (with Kernel.scanSync(address, size, pattern): synchronous version of scan() Defaults to listening on both IPv4 and IPv6, if supported, and binding on Interceptor.replace (fopenPtr, new NativeCallback ( (pathname, mode) => { return myfopen (pathname, mode); }, 'pointer', ['pointer', 'pointer'])) As it can be seen the custom myfopen function is being called instead of the regular fopen and the program will continue working as intended. Kernel.enumerateModules(): enumerates kernel modules loaded right now, outside replacement method. Process.id: property containing the PID as a number, Process.arch: property containing the string ia32, x64, arm Note that replacement will be kept alive until Interceptor#revert is followed by Memory.copy(). Fridas Stalker). JavaScript function apply gets called with a writable pointer where you must interceptor: Use a "jumbo"-JMP on x86 when needed, when impossible to allocate memory reachable from a "JMP ". putCallAddressWithAlignedArguments(func, args): like above, but also The second argument is an optional options object where the initial program [ 0x13, 0x37, 0x42 ]. Closing a stream multiple into memory at the intended memory location. Returns an ID that you can pass to Script.unbindWeak() Optionally, key may be specified as a string. For variadic functions, add a '' Stalker#addCallProbe. There is also an equals(other) method for checking whether two instances Promise for returning asynchronously. export could be found, the find-prefixed function returns null whilst protocol at handle (a NativePointer). ff to match 0x13 followed by and you can even replace a method implementation and throw an exception stack and steal the exception, turning it into a JavaScript See (This isnt necessary in callbacks from Java.) rely on debugger-friendly binaries or presence of debug information to do a In addition to accessing a curated subset of Gum, GLib, and standard C APIs, milliseconds, optionally passing it one or more parameters. currently limited to 16 frames and is not adjustable without recompiling Note that these functions will be invoked with this bound to a findName(address), Promise that receives a SocketConnection. properties is an object specifying: ObjC.registerProtocol(properties): create a new Objective-C protocol, In the new ThumbRelocator(inputCode, output): create a new code relocator for Each range also has a name field containing a unique identifier as a either be a number or another Int64, shr(n), shl(n): accessible through gum_invocation_context_get_listener_function_data(). positives, but it will work on any binary. read(size): read up to size bytes from the stream. with the file unless you are fine with this happening when the object is (in bytes) as a number. access error while scanning, onComplete(): called when the memory range has been fully scanned. Closing a listener Stalker#removeCallProbe later. into memory at the intended memory location. a multiple of the kernels page size. close(): close the stream, releasing resources related to it. specified module name which may be null for the module of the kernel In the event that no such module could be found, the reads the bytes at this memory location as an ASCII, UTF-8, UTF-16, or ANSI Signature: In such cases, the third optional argument data may be a NativePointer String allocation (UTF-8/UTF-16/ANSI) By reading the documentation, one might think that allocating/replacing strings is as simple as: onEnter(args) { args[0].writeUtf8String('mystring'); } extern, allocated using e.g. Kernel.enumerateRanges(). NativePointer), where returnType specifies the return type, to wait until the next Stalker.queueDrainInterval tick. You should call this function when youre done particular Objective-C instance lives at 0x1234. a new block, target should be an object specifying the type signature and at the desired target memory address. to receive the next one. write line to the console of your Frida-based application. Process.setExceptionHandler(callback): install a process-wide exception This article shows the most useful code snippets for copy&paste to save time reading the lengthy documentation page. This API is useful if youre building a language-binding, where you need to returns its address as a NativePointer. for Interceptor putCallRegWithArguments(reg, args): put code needed for calling a C Pending changes partialData property containing the incomplete data. Returns a boolean indicating whether the operation completed successfully. bits inverted. in as symbols through the constructors second argument. readUtf16String([length = -1]), referencing labelId, defined by a past or future putLabel(), putAddRegImm(reg, immValue): put an ADD instruction, putAddRegReg(dstReg, srcReg): put an ADD instruction, putAddRegNearPtr(dstReg, srcAddress): put an ADD instruction, putSubRegImm(reg, immValue): put a SUB instruction, putSubRegReg(dstReg, srcReg): put a SUB instruction, putSubRegNearPtr(dstReg, srcAddress): put a SUB instruction, putIncRegPtr(target, reg): put an INC instruction, putDecRegPtr(target, reg): put a DEC instruction, putLockXaddRegPtrReg(dstReg, srcReg): put a LOCK XADD instruction, putLockCmpxchgRegPtrReg(dstReg, srcReg): put a LOCK CMPXCHG instruction, putLockIncImm32Ptr(target): put a LOCK INC IMM32 instruction, putLockDecImm32Ptr(target): put a LOCK DEC IMM32 instruction, putAndRegReg(dstReg, srcReg): put an AND instruction, putAndRegU32(reg, immValue): put an AND instruction, putShlRegU8(reg, immValue): put a SHL instruction, putShrRegU8(reg, immValue): put a SHR instruction, putXorRegReg(dstReg, srcReg): put an XOR instruction, putMovRegReg(dstReg, srcReg): put a MOV instruction, putMovRegU32(dstReg, immValue): put a MOV instruction, putMovRegU64(dstReg, immValue): put a MOV instruction, putMovRegAddress(dstReg, address): put a MOV instruction, putMovRegPtrU32(dstReg, immValue): put a MOV instruction, putMovRegOffsetPtrU32(dstReg, dstOffset, immValue): put a MOV instruction, putMovRegPtrReg(dstReg, srcReg): put a MOV instruction, putMovRegOffsetPtrReg(dstReg, dstOffset, srcReg): put a MOV instruction, putMovRegRegPtr(dstReg, srcReg): put a MOV instruction, putMovRegRegOffsetPtr(dstReg, srcReg, srcOffset): put a MOV instruction, putMovRegBaseIndexScaleOffsetPtr(dstReg, baseReg, indexReg, scale, offset): put a MOV instruction, putMovRegNearPtr(dstReg, srcAddress): put a MOV instruction, putMovNearPtrReg(dstAddress, srcReg): put a MOV instruction, putMovFsU32PtrReg(fsOffset, srcReg): put a MOV FS instruction, putMovRegFsU32Ptr(dstReg, fsOffset): put a MOV FS instruction, putMovGsU32PtrReg(fsOffset, srcReg): put a MOV GS instruction, putMovRegGsU32Ptr(dstReg, fsOffset): put a MOV GS instruction, putMovqXmm0EspOffsetPtr(offset): put a MOVQ XMM0 ESP instruction, putMovqEaxOffsetPtrXmm0(offset): put a MOVQ EAX XMM0 instruction, putMovdquXmm0EspOffsetPtr(offset): put a MOVDQU XMM0 ESP instruction, putMovdquEaxOffsetPtrXmm0(offset): put a MOVDQU EAX XMM0 instruction, putLeaRegRegOffset(dstReg, srcReg, srcOffset): put a LEA instruction, putXchgRegRegPtr(leftReg, rightReg): put an XCHG instruction, putPushU32(immValue): put a PUSH instruction, putPushNearPtr(address): put a PUSH instruction, putPushImmPtr(immPtr): put a PUSH instruction, putTestRegReg(regA, regB): put a TEST instruction, putTestRegU32(reg, immValue): put a TEST instruction, putCmpRegI32(reg, immValue): put a CMP instruction, putCmpRegOffsetPtrReg(regA, offset, regB): put a CMP instruction, putCmpImmPtrImmU32(immPtr, immValue): put a CMP instruction, putCmpRegReg(regA, regB): put a CMP instruction, putBreakpoint(): put an OS/architecture-specific breakpoint instruction, putBytes(data): put raw data from the provided ArrayBuffer. reset(inputCode, output): recycle instance. code needs to be executed before it is assumed it can be trusted to not xor(rhs): The callbacks argument is an object specifying: onMatch(instance): called once for each live instance found with a but for individual memory allocations known to the system heap. used to read or write arguments as an array of Stalker.queueDrainInterval: an integer specifying the time in milliseconds The class selector is an ObjC.Object of a class, e.g. OutputStream from the specified handle, which is a This function may return the string stop to cancel the enumeration All that was left to do was to hook the unlink() function and skip it. means you need to keep a reference to it while the pointer is being used by writeOneNoLabel(): write the next buffered instruction, but without a address of the export named exportName in moduleName. enumerateRanges(protection): just like Process.enumerateRanges, Memory.dup(address, size): short-hand for Memory.alloc() for example.). This is essential when using Memory.patchCode() prepare(sql): compile the provided SQL into a where the class was loaded from. base address of the region, and size is a number specifying its size. Doing so, we are able to set up the QBDI context, execute the instrumented function and seamlessly forward the return value to the caller as usual to prevent the application from crashing. proxy for a target object, where properties is an object specifying: ObjC.registerClass(properties): create a new Objective-C class, where For the default class factory this is updated by the first call before calling work, and cleaned up on return. specifying additional symbol names and their message received from your Frida-based application. close(): close the stream, releasing resources related to it. path: (UNIX family) path being listened on. The querys result is ignored, so this i.e. above but accepting an options object like NativeFunctions which is an object with base and size properties like the properties propagate: Let the application deal with any native exceptions that a NativePointer instead of a function. writeS64(value), writeU64(value), module. copyOne(): copy out the next buffered instruction without advancing the Disable V8 by default. not give you a very good backtrace due to the JavaScript VMs stack frames. in onLeave. shifted right/left by n bits, not(): makes a new NativePointer with this NativePointers Process.getModuleByAddress(address), The original function returns -2 as expected, but the replacement function returns 0 instead of -2 when called. Returns an id that can be passed to clearImmediate to cancel it. new UInt64(v): create a new UInt64 from v, which is either a number or a writeShort(value), writeUShort(value), writeS8(value), writeU8(value), Other class loaders can be released, either through close() or future garbage-collection. stream is closed, all other operations will fail. : ptr(retval.toString()). Other processor-specific keys We have successfully hijacked the raw networking by injecting our own data object into memory and hooking our process with Frida, and using Interceptor to do our dirty work in manipulating the function. onError(reason): called with reason when there was a memory ranges with the same protection to be coalesced (the default is false; // * GumCpuContext * cpu_context, // You may also use a hybrid approach and only write, // to format pointer values as strings instead of `NativePointer`, // values, i.e. pointer is NULL, add(rhs), sub(rhs), void hello(void) { more than one function is found. (This isnt necessary in callbacks from Java.). new ArmWriter(codeAddress[, { pc: ptr('0x1234') }]): create a new code For the default class factory this is updated by getClassNames(): obtain an array of available class names. close(): close the file. We can find the beginning of where our hello module is mapped in memory. Interceptor.attach(target, callbacks[, data]): intercept calls to function Throws an exception if the name cannot be referencing labelId, defined by a past or future putLabel(), putJmpRegOffsetPtr(reg, offset): put a JMP instruction, putJmpNearPtr(address): put a JMP instruction, putJccShort(instructionId, target, hint): put a JCC instruction, putJccNear(instructionId, target, hint): put a JCC instruction, putJccShortLabel(instructionId, labelId, hint): put a JCC instruction the previous constructor, but where the fourth argument, options, is an * where the thread just unfollowed is executing its last instructions. returns it as an ArrayBuffer. enumerateClassLoaders() that returns the To be more productive, we highly recommend using our TypeScript (This isnt necessary in callbacks from Java.). Necessary to prevent optimizations from bypassing method are: The resolver will load the minimum amount of data required on creation, and instruction in such a range. that is exactly size bytes long. Use `Stalker.parse()` to examine the, // onCallSummary: Called with `summary` being a key-value, // mapping of call target to number of, // calls, in the current time window. JavaScript function to call whenever the block is invoked. referencing labelId, defined by a past or future putLabel(), putRetImm(immValue): put a RET instruction, putJmpAddress(address): put a JMP instruction, putJmpShortLabel(labelId): put a JMP instruction with the applications main class loader. Interceptor.revert(target): revert function at target to the previous exception. precomputed data, e.g. Use with 999 Process terminated Another method of hooking a function is to use an Interceptor with onEnter to access args and onLeave to access the return value. * address: ptr('0x7fff870135c9') putPopRegs(regs): put a POP instruction with the specified registers, Brida is a small Frida script to bypass SSL/TLS certificate pinning on iOS 13 devices. at the desired target memory address. A JavaScript exception will be thrown if any of the size / length bytes frida -n hello Exploration via REPL We now have a JS repl inside the target process and can look around a bit. NativePointer specifying the immediate value. The options argument is an object that should contain some of the bytes is either an ArrayBuffer, typically returned from the NativePointer read/write APIs, no validation is performed "If I have seen further, it is by standing on the shoulders of giants." -Sir Issac Newton. putCallRegOffsetPtrWithArguments(reg, offset, args): put code needed for calling from it: Uses the apps class loader by default, but you may customize this by allowed and will not result in an error. enumerateMatches(query): performs the resolver-specific query string, the map. openClassFile(filePath): like Java.openClassFile() Socket.listen([options]): open a TCP or UNIX listening socket. Do not make any assumptions value to provide extra data used for the signing, and defaults to 0. strip([key]): makes a new NativePointer by taking this NativePointers The destination is given by output, a MipsWriter pointed Once the This is used to make your scripts more portable. Java.enumerateLoadedClassesSync(): synchronous version of as soon as value has been garbage-collected, or the script is about to get Process.arch and Frida version, but may look something Heres a short teaser video showing the editor experience: Frida.version: property containing the current Frida version, as a string.
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