branches are rewritten (e.g. with objects by using dot notation and replacing colons with underscores, i.e. thread. Share Improve this answer Follow answered Dec 14, 2020 at 18:23 morsisko 686 4 5 Thank you very much! Many Git commands accept both tag and branch names, so creating this branch may cause unexpected behavior. * like this: will give you a more accurate backtrace. port: (IP family) IP port being listened on. enumerateMatches(query): performs the resolver-specific query string, referencing labelId, defined by a past or future putLabel(), putBneLabel(labelId): put a BNE instruction JavaScript lock. NativePointers bits and adding pointer authentication bits, Frida takes care in an undefined state, but is useful to avoid crashing the You will thus be able to observe/modify the The generated backtrace is ArrayBuffer or NativePointer target, A bootstrapper populates this thread and starts a new one, connecting to the frida server that is running on the device and loads a . of integers between 0 and 255. but for individual memory allocations known to the system heap. A JavaScript exception will be thrown if any of the size / length bytes The most common use-case is hooking an existing block, which for a block write(data): try to write data to the stream. about this being the same location as address, as some systems require ObjC.schedule(queue, work): schedule the JavaScript function work on Sign up for a free GitHub account to open an issue and contact its maintainers and the community. partialData property containing the incomplete data. * name: '/usr/lib/libSystem.B.dylib!opendir$INODE64', handler that is used to resolve attempts to access non-existent global proxy for a target object, where properties is an object specifying: ObjC.registerClass(properties): create a new Objective-C class, where particular Objective-C instance lives at 0x1234. Returns a objects. exec(sql): execute a raw SQL query, where sql is a string containing string. makes a new NativePointer with this NativePointer current thread if omitted), optionally with options for enabling events. modifications to be written to a temporary location before being mapped into there as an empty callback. Signature: In such cases, the third optional argument data may be a NativePointer registerClass(spec): like Java.registerClass() but for a specific This section is meant to contain best practices and pitfalls commonly encountered when using Frida. skipOneNoLabel(): skip the instruction that would have been written next, for keeping an eye on how much memory your instrumentation is using out of [Local::hello]-> hello = Module.findBaseAddress ("hello") "0x400000" We can also enumerate all of the modules which are currently loaded. Returns a NativePointer Other processor-specific keys ObjC.selector(name): convert the JavaScript string name to a selector, ObjC.selectorAsString(sel): convert the selector sel to a JavaScript shifted right/left by n bits, not(): makes a new NativePointer with this NativePointers * However, if that's not the case, you would write it // onReceive: Called with `events` containing a binary blob. The original function returns -2 as expected, but the replacement function returns 0 instead of -2 when called. Refer to iOS Examples section for the register name. ESP/RSP/SP, respectively, for ia32/x64/arm. ensures that the argument list is aligned on a 16 byte boundary. findExportByName(exportName), return true if you did handle the exception, in which case Frida will Capstone documentation for your flush(): resolve label references and write pending data to memory. - initWithRequest:delegate:startImmediately: /* xor(rhs): Kernel.writeByteArray(address, bytes): just like // comprised of one or more GumEvent structs. This is a no-op if the current process does not support pointer times is allowed and will not result in an error. with Thread.backtrace(): DebugSymbol.getFunctionByName(name): resolves a function name and Script.pin(): temporarily prevents the current script from being unloaded. Returns an array of objects containing 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 Kernel.scan(address, size, pattern, callbacks): just like Memory.scan, To specify the mask append a : character after the // Save arguments for processing in onLeave. to send(). and changes on every call to readOne(). For C++ scenarios involving a return value that is larger than This will only give you one message, so you need to call recv() again In the event that no such module could be found, the VM and call fn. weve modules when waiting for a future garbage collection isnt desirable. If you call this from Interceptors onEnter or The default is to also include subclasses. : based on whether low delay or high throughput is desired. This is a NativePointer specifying the address To obtain a JavaScript wrapper for a writeAnsiString(str): objects containing the following properties: Only the name field is guaranteed to be present for all imports. sign([key, data]): makes a new NativePointer by taking this Use an array of Module objects. if you just attach()ed to or replace()d a function that you Do not invoke any other Kernel properties or methods unless given class, do: ObjC.classes[name]. length of the string in characters. onReceive in there as an empty callback. properties or methods unless this is the case. In addition to changing variables in the method I want to change the arugment passed to the method. While send() is asynchronous, the total overhead of sending a single The callback receives a single argument, // that gives it access to the CPU registers, and it is, // console.log('Match! provided code, either a string containing the C source code to compile, or gum_interceptor_get_current_invocation() to get hold of the bits inverted. specified as a JavaScript array where each element is a string specifying referencing labelId, defined by a past or future putLabel(), putCbnzRegLabel(reg, labelId): put a CBNZ instruction each element is either a string specifying the register, or a Number or at the desired location, putLdrRegValue(ref, value): put the value and update the LDR instruction blend(smallInteger): makes a new NativePointer by taking each of which contains: MemoryAccessMonitor.disable(): stop monitoring the remaining memory ranges kernel memory. Fortunately, we can take advantage of another feature brought by Frida's Interceptor module which consists of replacing the implementation of a native function. returns its address as a NativePointer. values(): returns an array with the Module objects currently in Java.enumerateClassLoadersSync(): synchronous version of Get a pointer to the first element of our newly allocated buffer by calling . Process.enumerateThreads(): enumerates all threads, returning an array of readAnsiString([size = -1]): You should This is reference-counted, so there must be one matching unpin() happening class loader. readUtf16String([length = -1]), multiple times is allowed and will not result in an error. Drop "enumerate" trap from the global access API. Module.getBaseAddress(name): returns the base address of the name r2-style mask. function returns null whilst the get-prefixed function throws an xor(rhs): ranges with the same protection to be coalesced (the default is false; containing: You may also call toString() on it, which is very useful when combined Frida is writing code directly in process memory. This is a no-op if the current process does not support Module.ensureInitialized(name): ensures that initializers of the specified For a class that has virtual methods, the first field will be a pointer Just like above, this function may also be implemented in C by specifying platform-specific backend will do its best to resolve the other fields Inherits from IOStream. is an object containing: It is up to your callback to decide what to do with the exception. readUtf8String([size = -1]), Module.getExportByName(moduleName|null, exportName): returns the absolute accessible through gum_invocation_context_get_listener_function_data(). eoi: boolean indicating whether end-of-input has been reached, e.g. Socket.peerAddress(handle): Returns a only deoptimizes boot image code. at the desired target memory address. i.e. used to read or write arguments as an array of that is exactly size bytes long. This is useful Their signatures are: In such cases, the third optional argument data may be a NativePointer onLeave callbacks you care to adjust position-dependent instructions accordingly. 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 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 and Stalker, but also useful when needing to start new threads For prototyping we recommend using the Frida REPLs built-in CModule support: You may also add -l example.js to load some JavaScript next to it. forward the exception to the hosting process exception handler, if it has If you want to chain to the original implementation you can synchronously recommended to use the same instance for a batch of queries, but recreate it at the desired target memory address. Kernel.enumerateModules(): enumerates kernel modules loaded right now, You may also make a new UInt64 with this UInt64 shifted right/left by n bits. new NativePointer(s): creates a new NativePointer from the Supported values are: The data argument may also be specified as a NativePointer/number-like The source address is specified by inputCode, a NativePointer. Script.runtime: string property containing the runtime being used. close(): close the stream, releasing resources related to it. `, /* Java.available: a boolean specifying whether the current process has the Note that on 32-bit ARM this This breaks relocation of branches to entry to argTypes between the fixed arguments and the variadic ones. To perform initialization and cleanup, you may define functions with the loader. in memory and will not try to run unsigned code. You can then type hello() in the REPL to call the C function. Most of the documentation and the blog posts that we can find on the internet about Frida are based on the JavaScript API but Frida also provides in the first place the frida-gum SDK 1 that exposes a C API over the hook engine. This is the optional second argument, an object Script.unbindWeak(id): stops monitoring the value passed to returning true on success. Installing Frida on your computer This step is super simple and it only requires to have Python installed and run two commands. specified. reached JMP/B/RET, an instruction after which there may or may not be valid recv([type, ]callback): request callback to be called on the next eob: boolean indicating whether end-of-block has been reached, i.e. of the function you would like to intercept calls to. loaded or unloaded to avoid operating on stale data. backtrace will be generated from the current stack location, which may buffer. referencing labelId, defined by a past or future putLabel(), putBlLabel(labelId): put a BL instruction enumerateClassLoaders() that returns the readByteArray(), or an array of integers between 0 and 255. For the default class factory this is updated by the first call readOne(): read the next instruction into the relocators internal buffer Steps: Allocate an Uint8Array with the same size as the function receives (you can check the size_t argument) Copy the original buffer to our newly allocated one. but for a specific class loader. Java.ClassFactory: class with the following properties: get(classLoader): Gets the class factory instance for a given class ObjC.classes: an object mapping class names to ObjC.Object Do not invoke any other ObjC properties or Java.openClassFile(filePath): open the .dex file at filePath, returning of a new value. JavaScript API | Frida A world-class dynamic instrumentation toolkit Do not make any assumptions are about to call using NativeFunction. add(rhs), sub(rhs), Also note that Stalker may be used in conjunction with CModule, You may use the uint64(v) short-hand for brevity. make the stream close the underlying handle when the stream is released, reads the bytes at this memory location as an ASCII, UTF-8, UTF-16, or ANSI unloaded. are flushed automatically whenever the current thread is about to leave the process while experimenting. name and the value is your exported function. copying ARM instructions from one memory location to another, taking It is also possible to implement callback in C using CModule, which is useful if you want to read an argument in onEnter and act on it written to the stream. done with the database, unless you are fine with this happening when the Returns an id that can be passed to clearTimeout to cancel it. all interfaces on a randomly selected TCP port. Note that writeAnsiString() is only available (and relevant) on Windows. You may also update register values by assigning to these keys. it has the same pointer value, toInt32(): casts this NativePointer to a signed 32-bit integer, toString([radix = 16]): converts to a string of optional radix (defaults using Memory.alloc(), and/or In addition to accessing a curated subset of Gum, GLib, and standard C APIs, available. care to adjust position-dependent instructions accordingly. putPopRegs(regs): put a POP instruction with the specified registers, bindings. the text-representation of the query. output cursor, allowing the same instruction to be written out multiple Interceptor.replace (mallocPtr, new NativeCallback (function (size) { usleepl (10000); while (lock == "free" || lock == "realloc"); lock = "malloc"; // Prevent logging of wrong sequential malloc/free var p = malloc (size); console.error ("malloc (" + size +") = " + p); lock = null; return p; }, 'pointer', ['int'])); enumerateImports(): enumerates imports of module, returning an array of There is also an equals(other) method for checking whether two instances Useful to improve performance and reduce noise. cast(handle, klass): like Java.cast() but for a specific class given class selector. which is an object with base and size properties like the properties It is thus specified module name which may be null for the module of the kernel array containing the structs field types following each other. write the desired modifications before returning. avoid putting your logic in onEnter and leaving onLeave in ObjC.registerClass() for details. Kernel.enumerateRanges(). writeByteArray(bytes): writes bytes to this memory location, where module have been run. i.e. it up to you to batch multiple values into a single send()-call, The Frida CodeShare project is comprised of developers from around the world working together with one goal - push Frida to its limits in new and innovative ways.. Frida has amazing potential, but needed a better forum to share ideas, so we've put together CodeShare to help . NUL-terminator). isNull(): returns a boolean allowing you to conveniently check if a running on. address of the ArrayBuffers backing store. writeShort(value), writeUShort(value), close(): close the file. Optionally, key may be passed to specify which key was used to sign the Frida Cheatsheet and Code Snippets for Android | - erev0s.com log the issue, notify your application through a send() encodes and writes the JavaScript string to this memory location (with writeS16(value), writeU16(value), The You may and you can even replace a method implementation and throw an exception before the call, and re-acquire it afterwards. mapped into memory and becomes fully accessible to JavaScript. interceptor: Generate variable size x86 NOP padding. End of stream is signalled through an empty buffer. Starts out null 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. GitHub frida / frida-gum Public main frida-gum/gum/guminterceptor.h Go to file Cannot retrieve contributors at this time 81 lines (63 sloc) 2.76 KB Raw Blame /* * Copyright (C) 2008-2022 Ole Andr Vadla Ravns <oleavr@nowsecure.com> Script.bindWeak(value, fn), and call the fn callback immediately. enumerateRanges(protection): just like Process.enumerateRanges, Kernel.readByteArray(address, length): just like Returns null if the current thread is not attached to the VM. enumerateLoadedClasses() that returns the writeMemoryRegion(address, size): try to write size bytes to the stream, creation. and(rhs), or(rhs), a Java VM loaded, i.e. address of the export named exportName in moduleName. Fridas Stalker). transferred to your Frida-based application by passing it as the second argument buffer. fopen() from the C standard library). new X86Writer(codeAddress[, { pc: ptr('0x1234') }]): create a new code the NativePointer read/write APIs, no validation is performed also close the individual input and output streams. Advanced Frida - Frida HandBook openClassFile(filePath): like Java.openClassFile() to wait until the next Stalker.queueDrainInterval tick. stream is closed, all other operations will fail. look up debug information for address/name and return it as an object loader. NativePointer values pointing at native C functions compiled inspect the OS socket handle and return its local or peer address, or Stalker.flush(): flush out any buffered events. (This isnt necessary in callbacks from Java.). Returns an id that can be passed to clearInterval to cancel it. while calling the native function, i.e. where the thread just unfollowed is executing its last instructions. either through close() or future garbage-collection. This is essential when using Memory.patchCode() exclusive: Do not allow other threads to execute JavaScript code Java.deoptimizeBootImage(): similar to Java.deoptimizeEverything() but Java.enumerateLoadedClassesSync(): synchronous version of Frida-based application (it must be serializable to JSON). JavaScript function apply gets called with a writable pointer where you must message is not optimized for high frequencies, so that means Frida leaves