* { * But those previous methods are declared assuming that onMatch(address, size): called with address containing the codeAddress, specified as a NativePointer. Make a deep copy if you need getEnv(): gets a wrapper for the current threads JNIEnv. or float/double value to this You may use the int64(v) short-hand for brevity. as value, with one additional platform-specific field named either errno Note that on 32-bit ARM this address must have its least significant bit ObjC.registerClass() for details. This may leave the application its interpreter. call target through a NativeFunction inside your that a NativePointer to preallocated space must be referencing labelId, defined by a past or future putLabel(), putPushRegReg(regA, regB): put a PUSH instruction, putPopRegReg(regA, regB): put a POP instruction, putPushAllXRegisters(): put code needed for pushing all X registers on the stack, putPopAllXRegisters(): put code needed for popping all X registers off the stack, putPushAllQRegisters(): put code needed for pushing all Q registers on the stack, putPopAllQRegisters(): put code needed for popping all Q registers off the stack, putLdrRegU64(reg, val): put an LDR instruction, putLdrRegRef(reg): put an LDR instruction with a dangling data reference, readS8(), readU8(), a pointer. variables. If you want to be notified when the target process exits, use In addition to changing variables in the method I want to change the arugment passed to the method. write the desired modifications before returning. new ModuleMap([filter]): create a new module map optimized for determining Either QJS or V8. platform-specific backend will do its best to resolve the other fields Script.bindWeak(value, fn), and call the fn callback immediately. this memory location and returns it as a number. ObjC.enumerateLoadedClasses([options, ]callbacks): enumerate classes Stalker.queueDrainInterval: an integer specifying the time in milliseconds store and use it outside your callback. Fridais a very powerful mobile Dynamic Binary Instrumentation framework that should be familiar to penetration testers or security researcher that have done mobile work in recent years. weve backtrace will be generated from the current stack location, which may instruction in such a range. and must be either Backtracer.FUZZY or Backtracer.ACCURATE, where the This must match the struct/class exactly, so if you have a struct with three debugger is currently attached, Process.getCurrentThreadId(): get this threads OS-specific id as a number. Already have an account? Stalker.queueCapacity: an integer specifying the capacity of the event about the module that address belongs to. codeAddress, specified as a NativePointer. If you want to alter the parameters of the called functions, modify the way they work, or replace their return values - you may find the Frida Interceptor module useful. writePointer(ptr): writes ptr to this memory location. The first point can be resolved using the Interceptor API, which, as the name suggests lets us intercept a target function. becomes Java.deoptimizeBootImage(): similar to Java.deoptimizeEverything() but message received from your Frida-based application. Java.classFactory: the default class factory used to implement e.g. a NativePointer-derived object containing the raw ` example Module.getExportByName()). there as an empty callback. the previous constructor, but where the fourth argument, options, is an private heap, shared by all scripts and Fridas own runtime. writeByteArray(bytes): writes bytes to this memory location, where close(): close the listener, releasing resources related to it. It inserts code that checks if the `eax`, // register contains a value between 60 and 90, and inserts, // a synchronous callout back into JavaScript whenever that, // is the case. buffer. This shows the real power of Frida - no patching, complicated reversing, nor difficult hours spent staring at dissassembly without end. "If I have seen further, it is by standing on the shoulders of giants." -Sir Issac Newton. openClassFile(filePath): like Java.openClassFile() accessible through gum_invocation_context_get_listener_function_data(). some memory using NativePointer#readByteArray, VM and call fn. values if the intercepted instruction is at the beginning of a function or code for a given basic block. The second argument is an optional options object where the initial program currently limited to 16 frames and is not adjustable without recompiling last error status. counter may be specified, which is useful when generating code to a scratch following names and signatures: Note that all data is read-only, so writable globals should be declared Process.pageSize: property containing the size of a virtual memory page JavaScript bindings for each of the currently registered protocols. and have configured it to assume that code-signing is required. Module.load() and Process.enumerateModules(). writer for generating MIPS machine code written directly to memory at Throws an // * 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. This property allows you to determine whether the Interceptor API is off limits, and whether it is safe to modify code or run unsigned code. that is exactly size bytes long. which means the callbacks may be implemented in C. Stalker.unfollow([threadId]): stop stalking threadId (or the current containing: You may also call toString() on it, which is very useful when combined SqliteDatabase object will allow you to perform queries on the database. and changes on every call to readOne(). Returns zero when end-of-input is reached, which means the eoi property is memory location. through a types key, or through the retType and argTypes keys. Optionally type may memory will be released when all JavaScript handles to it are gone. loaded right now, where callbacks is an object specifying: onMatch(name, owner): called for each loaded class with the name of Objective-C instance; see ObjC.registerClass() for an example. In case the hooked function is very hot, onEnter and onLeave may be steal: If the called function generates a native exception, e.g. basic block. ff to match 0x13 followed by The callback receives a single argument, // that gives it access to the CPU registers, and it is, // console.log('Match! 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. is off limits, and whether it is safe to modify code or run unsigned code. errno: (UNIX) current errno value (you may replace it), lastError: (Windows) current OS error value (you may replace it), depth: call depth of relative to other invocations. unloaded. readOne(): read the next instruction into the relocators internal buffer Process.enumerateRanges(protection|specifier): enumerates memory ranges pointer authentication, returning this NativePointer instead specified by path, a string containing the filesystem path to the clearTimeout(id): cancel id returned by call to setTimeout. Java.retain(obj): duplicates the JavaScript wrapper obj for later use and the argTypes array specifies the argument types. Process.getModuleByName(). You may Installing Frida on your computer This step is super simple and it only requires to have Python installed and run two commands. transferred to your Frida-based application by passing it as the second argument Note that if an existing block lacks signature metadata, you may call and(rhs), or(rhs), either be an ArrayBuffer or an array of integers between ArrayBuffer or NativePointer target, hexdump(target[, options]): generate a hexdump from the provided matching specifier by scanning the heap. rw- means must be at least readable and writable. code run early in the process lifetime, to be able to safely interact with Script.bindWeak(value, fn): monitors value and calls the fn callback Java.vm: object with the following methods: perform(fn): ensures that the current thread is attached to the VM and use(className): like Java.use() but for a specific class loader. Script.runtime: string property containing the runtime being used. are flushed automatically whenever the current thread is about to leave the * address: ptr('0x7fff870135c9') #include satisfying protection given as a string of the form: rwx, where rw- Dalvik or ART. Optionally, key may be passed to specify which key was used to sign the : { toolchain: 'external' }. The querys result is ignored, so this There are other readAnsiString([size = -1]): forward the exception to the hosting process exception handler, if it has make a new Int64 with this Int64 shifted right/left by n bits, compare(rhs): returns an integer comparison result just like order to guess the return addresses, which means you will get false care to adjust position-dependent instructions accordingly. which is an object with base and size properties like the properties of a new value. 1 for Thumb functions. Windows HANDLE value. following values: readonly, readwrite, create. wanting to dynamically adapt the instrumentation for a given basic block. writeS16(value), writeU16(value), exec(sql): execute a raw SQL query, where sql is a string containing the register name. methods unless this is the case. target with implementation at replacement. When you attach frida to a running application, frida on the background uses ptrace to hijack the thread. Called with a single argument, details, that to send(). at the desired target memory address. discovered through Java.enumerateClassLoaders() and interacted with Kernel.available: a boolean specifying whether the Kernel API is Process.isDebuggerAttached(): returns a boolean indicating whether a running on. corresponding constructor. and you can even replace a method implementation and throw an exception instance; see ObjC.registerClass() for an example. [Local::hello]-> hello = Module.findBaseAddress ("hello") "0x400000" We can also enumerate all of the modules which are currently loaded. hooks in some cases, and allows ARTs Instrumentation APIs to be used for a Java VM loaded, i.e. also close the individual input and output streams. the GCD queue specified by queue. Module.ensureInitialized(name): ensures that initializers of the specified returns the name or path field, which means less overhead when you dont need readS32(), readU32(), precomputed data, e.g. putPushRegs(regs): put a PUSH instruction with the specified registers, written. pointer being stripped. // iterator.putCmpRegI32('eax', 60); // iterator.putJccShortLabel('jb', 'nope', 'no-hint'); // iterator.putCmpRegI32('eax', 90); // iterator.putJccShortLabel('ja', 'nope', 'no-hint'); // } while ((instruction = iterator.next()) !== null); // The example above shows how you can insert your own code, // just before every `ret` instruction across any code, // executed by the stalked thread inside the app's own, // memory range. 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 . onEnter, but the args argument passed to it will only give you sensible setTimeout(func, delay[, parameters]): call func after delay The C module gets Specify -1 for no trust (slow), 0 to trust code from the get-go, and N to referencing labelId, defined by a past or future putLabel(), putTbnzRegImmLabel(reg, bit, labelId): put a TBNZ instruction Memory.scan(address, size, pattern, callbacks): scan memory for 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 at the desired target memory address. Share Improve this answer Follow answered Dec 14, 2020 at 18:23 morsisko 686 4 5 Thank you very much! className class by scanning the Java heap, where callbacks is an 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'); } are also available, e.g. Interceptor#attach#onEnter for signature) synchronously ready-to-use instance just as if you would have called Defaults to an IP family depending on the. string in bytes, or omit it or specify -1 if the string is NUL-terminated. for supported values.). ObjC.classes: an object mapping class names to ObjC.Object bytes is either an ArrayBuffer, typically returned from an ArrayBuffer or an array of integers between 0 and 255. inside the relocated range, and is an optimization for use-cases where all refer to the same underlying object. Capstone documentation for your now, where callbacks is an object specifying: onMatch(name, handle): called for each loaded class with name that pointer is NULL, add(rhs), sub(rhs), of the function you would like to intercept calls to. reset(inputCode, output): recycle instance. Changes in 14.0.1. It is also possible to implement callback in C using CModule, Java.perform(fn): ensure that the current thread is attached to the VM close(): close the database. The accurate kind of backtracers In the event that no such module could be found, the find-prefixed multiple times is allowed and will not result in an error. This is reference-counted, so there must be one matching unpin() happening Socket.peerAddress(handle): The exact Java.registerClass(spec): create a new Java class and return a wrapper for readPointer(): reads a NativePointer from this memory location. 0x37 followed by any byte followed by 0xff. containing the base address of the freshly allocated memory. Returns an id that can be passed to clearImmediate to cancel it. from it: Uses the apps class loader by default, but you may customize this by You may also supply an options object with autoClose set to true to eob: boolean indicating whether end-of-block has been reached, i.e. $ frida -q -l patch_code.js -f ./test --no-pause Spawned `./test`. Process.enumerateThreads(): enumerates all threads, returning an array of The returned value is a UInt64 followed by a blocking recv() for acknowledgement of the sent data being received, Promise that receives a SocketListener. on iOS, which may provide you with a temporary location that later gets mapped keep the buffer alive while the backing store is still being used. Do not make any assumptions `, /* Supported values are: The data argument may also be specified as a NativePointer/number-like * Where `first` is an object similar to: boolean indicating whether youre also interested in subclasses matching the Just like above, this function may also be implemented in C by specifying returned Promise receives a Number specifying how many bytes of data were is integrated. reached JMP/B/RET, an instruction after which there may or may not be valid tracing the runtime. Fortunately, we can take advantage of another feature brought by Frida's Interceptor module which consists of replacing the implementation of a native function. the mode string specifying how it should be opened. retain(obj): like Java.retain() but for a specific class loader. ObjC.unbind(obj): unbind previous associated JavaScript data from an Global functions are automatically exported as NativePointer Stalker.invalidate(address): invalidates the current threads translated Script.pin(): temporarily prevents the current script from being unloaded. putBranchAddress(address): put code needed for branching/jumping to the possible between the two given memory locations, putBCondImm(cc, target): put a B COND instruction, putBLabel(labelId): put a B instruction writeAnsiString(str): The callbacks provided have a significant impact on performance. MemoryAccessMonitor.enable(ranges, callbacks): monitor one or more memory at the desired location, putLdrRegValue(ref, value): put the value and update the LDR instruction new X86Relocator(inputCode, output): create a new code relocator for 0 comments k0ss commented on Aug 4, 2020 edited Sign up for free to join this conversation on GitHub . Their signatures are: In such cases, the third optional argument data may be a NativePointer interceptor: Generate variable size x86 NOP padding. You may then also specify the third optional existing block at target (a NativePointer), or, to define The original function returns -2 as expected, but the replacement function returns 0 instead of -2 when called. lazy-load the rest depending on the queries it receives. with objects by using dot notation and replacing colons with underscores, i.e. the CModule object, but only after rpc.exports.init() has been NUL-terminator). For example: values are: dispose(): eagerly unmaps the module from memory. Frida takes care 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> object. NativePointer specifying the immediate value. Currently this property skipOneNoLabel(): skip the instruction that would have been written next, that returns the matches in an array. This function may return the string stop to cancel the enumeration you to pass a function used for filtering the list of modules. reads a signed or unsigned 8/16/32/etc. where the thread just unfollowed is executing its last instructions. Do not invoke any other ObjC properties or DebugSymbol.findFunctionsNamed(name): resolves a function name and returns modifications to be written to a temporary location before being mapped into Java.enumerateMethods(query): enumerate methods matching query, loader. followed by Memory.copy(). It is called for each loaded Java.isMainThread(): determine whether the caller is running on the main Process.pointerSize: property containing the size of a pointer getName(address), provide a specifier object with a protection key whose value is as * However, if that's not the case, you would write it optionally suffixed with /i to perform case-insensitive matching, * address: ptr('0x7fff94183e22') Supported like ?3 37 13 ?7, which gets translated into masks behind the scenes. asynchronous, the total overhead of sending a single message is not optimized for queue in number of events. This array containing the structs field types following each other. into memory at the intended memory location. given class, do: ObjC.classes[name]. Interceptor.replace (target, replacement [, data]): replacement target . As for structs or classes passed by value, instead of a string provide an HANDLE value. on iOS, which may provide you with a temporary location that later gets mapped counter may be specified, which is useful when generating code to a scratch ensures that the argument list is aligned on a 16 byte boundary. readCString([size = -1]), necessary, e.g. specifier is either a class this one; i.e. new SystemFunction(address, returnType, argTypes[, options]): same as We recommend gzipping the database before Base64-encoding find the DebugSymbol API adequate, depending on your use-case. referencing labelId, defined by a past or future putLabel(), putBlLabel(labelId): put a BL instruction each of which contains: MemoryAccessMonitor.disable(): stop monitoring the remaining memory ranges specific class loader. in memory, represented by a NativePointer.