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https://github.com/carlospolop/hacktricks
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281 lines
12 KiB
Markdown
281 lines
12 KiB
Markdown
# macOS函数挂钩
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<details>
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<summary><a href="https://cloud.hacktricks.xyz/pentesting-cloud/pentesting-cloud-methodology"><strong>☁️ HackTricks云 ☁️</strong></a> -<a href="https://twitter.com/hacktricks_live"><strong>🐦 推特 🐦</strong></a> - <a href="https://www.twitch.tv/hacktricks_live/schedule"><strong>🎙️ Twitch 🎙️</strong></a> - <a href="https://www.youtube.com/@hacktricks_LIVE"><strong>🎥 Youtube 🎥</strong></a></summary>
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* 你在一家**网络安全公司**工作吗？你想在HackTricks中看到你的**公司广告**吗？或者你想获得**PEASS的最新版本或下载PDF格式的HackTricks**吗？请查看[**订阅计划**](https://github.com/sponsors/carlospolop)！
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* 发现我们的独家[NFT](https://opensea.io/collection/the-peass-family)收藏品[**The PEASS Family**](https://opensea.io/collection/the-peass-family)
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* 获得[**官方PEASS和HackTricks周边产品**](https://peass.creator-spring.com)
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* **加入**[**💬**](https://emojipedia.org/speech-balloon/) [**Discord群组**](https://discord.gg/hRep4RUj7f)或[**电报群组**](https://t.me/peass)或**关注**我在**Twitter**上的[**🐦**](https://github.com/carlospolop/hacktricks/tree/7af18b62b3bdc423e11444677a6a73d4043511e9/\[https:/emojipedia.org/bird/README.md)[**@carlospolopm**](https://twitter.com/hacktricks\_live)**。**
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* **通过向**[**hacktricks repo**](https://github.com/carlospolop/hacktricks) **和**[**hacktricks-cloud repo**](https://github.com/carlospolop/hacktricks-cloud) **提交PR来分享你的黑客技巧。**
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</details>
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## 函数替换
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创建一个包含指向**原始函数**和**替换函数**的**函数指针**元组的**dylib**，并带有一个**`__interpose`**部分（或带有**`S_INTERPOSING`**标志的部分）。
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然后，使用**`DYLD_INSERT_LIBRARIES`**注入dylib（替换需要在主应用程序加载之前发生）。显然，这个限制受到了对DYLD\_INSERT\_LIBRARIES使用的限制。 
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### 替换printf
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{% tabs %}
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{% tab title="interpose.c" %}
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{% code title="interpose.c" %}
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```c
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// gcc -dynamiclib interpose.c -o interpose.dylib
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#include <stdio.h>
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#include <stdarg.h>
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int my_printf(const char *format, ...) {
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//va_list args;
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//va_start(args, format);
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//int ret = vprintf(format, args);
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//va_end(args);
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int ret = printf("[+] Hello from interpose\n");
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return ret;
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}
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__attribute__((used)) static struct { const void *replacement; const void *replacee; } _interpose_printf
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__attribute__ ((section ("__DATA,__interpose"))) = { (const void *)(unsigned long)&my_printf, (const void *)(unsigned long)&printf };
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```
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{% endcode %}
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{% endtab %}
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{% tab title="hello.c" %}
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```c
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//gcc hello.c -o hello
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#include <stdio.h>
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int main() {
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printf("Hello, World!\n");
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return 0;
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}
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```
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{% endtab %}
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{% endtabs %}
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```bash
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DYLD_INSERT_LIBRARIES=./interpose.dylib ./hello
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[+] Hello from interpose
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```
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## 方法交换
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在ObjectiveC中，方法的调用方式是：`[myClassInstance nameOfTheMethodFirstParam:param1 secondParam:param2]`
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需要提供**对象**、**方法**和**参数**。当调用方法时，会使用函数**`objc_msgSend`**发送一条消息：`int i = ((int (*)(id, SEL, NSString *, NSString *))objc_msgSend)(someObject, @selector(method1p1:p2:), value1, value2);`
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对象是**`someObject`**，方法是**`@selector(method1p1:p2:)`**，参数是**value1**和**value2**。
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根据对象的结构，可以找到一个包含方法**名称**和**指向方法代码的指针**的方法数组。
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{% hint style="danger" %}
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请注意，由于方法和类是根据名称访问的，这些信息存储在二进制文件中，因此可以使用`otool -ov </path/bin>`或[`class-dump </path/bin>`](https://github.com/nygard/class-dump)来检索它们。
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{% endhint %}
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### 访问原始方法
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可以访问方法的信息，例如名称、参数数量或地址，如下面的示例所示：
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```objectivec
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// gcc -framework Foundation test.m -o test
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#import <Foundation/Foundation.h>
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#import <objc/runtime.h>
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#import <objc/message.h>
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int main() {
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// Get class of the variable
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NSString* str = @"This is an example";
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Class strClass = [str class];
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NSLog(@"str's Class name: %s", class_getName(strClass));
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// Get parent class of a class
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Class strSuper = class_getSuperclass(strClass);
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NSLog(@"Superclass name: %@",NSStringFromClass(strSuper));
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// Get information about a method
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SEL sel = @selector(length);
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NSLog(@"Selector name: %@", NSStringFromSelector(sel));
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Method m = class_getInstanceMethod(strClass,sel);
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NSLog(@"Number of arguments: %d", method_getNumberOfArguments(m));
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NSLog(@"Implementation address: 0x%lx", (unsigned long)method_getImplementation(m));
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// Iterate through the class hierarchy
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NSLog(@"Listing methods:");
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Class currentClass = strClass;
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while (currentClass != NULL) {
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unsigned int inheritedMethodCount = 0;
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Method* inheritedMethods = class_copyMethodList(currentClass, &inheritedMethodCount);
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NSLog(@"Number of inherited methods in %s: %u", class_getName(currentClass), inheritedMethodCount);
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for (unsigned int i = 0; i < inheritedMethodCount; i++) {
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Method method = inheritedMethods[i];
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SEL selector = method_getName(method);
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const char* methodName = sel_getName(selector);
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unsigned long address = (unsigned long)method_getImplementation(m);
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NSLog(@"Inherited method name: %s (0x%lx)", methodName, address);
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}
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// Free the memory allocated by class_copyMethodList
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free(inheritedMethods);
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currentClass = class_getSuperclass(currentClass);
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}
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// Other ways to call uppercaseString method
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if([str respondsToSelector:@selector(uppercaseString)]) {
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NSString *uppercaseString = [str performSelector:@selector(uppercaseString)];
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NSLog(@"Uppercase string: %@", uppercaseString);
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}
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// Using objc_msgSend directly
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NSString *uppercaseString2 = ((NSString *(*)(id, SEL))objc_msgSend)(str, @selector(uppercaseString));
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NSLog(@"Uppercase string: %@", uppercaseString2);
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// Calling the address directly
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IMP imp = method_getImplementation(class_getInstanceMethod(strClass, @selector(uppercaseString))); // Get the function address
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NSString *(*callImp)(id,SEL) = (typeof(callImp))imp; // Generates a function capable to method from imp
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NSString *uppercaseString3 = callImp(str,@selector(uppercaseString)); // Call the method
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NSLog(@"Uppercase string: %@", uppercaseString3);
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return 0;
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}
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```
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### 使用method\_exchangeImplementations进行方法交换
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函数method\_exchangeImplementations允许将一个函数的地址更改为另一个函数的地址。因此，当调用一个函数时，实际执行的是另一个函数。
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```objectivec
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//gcc -framework Foundation swizzle_str.m -o swizzle_str
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#import <Foundation/Foundation.h>
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#import <objc/runtime.h>
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// Create a new category for NSString with the method to execute
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@interface NSString (SwizzleString)
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- (NSString *)swizzledSubstringFromIndex:(NSUInteger)from;
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@end
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@implementation NSString (SwizzleString)
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- (NSString *)swizzledSubstringFromIndex:(NSUInteger)from {
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NSLog(@"Custom implementation of substringFromIndex:");
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// Call the original method
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return [self swizzledSubstringFromIndex:from];
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}
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@end
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int main(int argc, const char * argv[]) {
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// Perform method swizzling
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Method originalMethod = class_getInstanceMethod([NSString class], @selector(substringFromIndex:));
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Method swizzledMethod = class_getInstanceMethod([NSString class], @selector(swizzledSubstringFromIndex:));
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method_exchangeImplementations(originalMethod, swizzledMethod);
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// We changed the address of one method for the other
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// Now when the method substringFromIndex is called, what is really coode is swizzledSubstringFromIndex
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// And when swizzledSubstringFromIndex is called, substringFromIndex is really colled
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// Example usage
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NSString *myString = @"Hello, World!";
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NSString *subString = [myString substringFromIndex:7];
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NSLog(@"Substring: %@", subString);
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return 0;
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}
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```
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### 使用method\_setImplementation进行方法交换
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之前的格式很奇怪，因为你正在改变一个方法的实现方式，将其替换为另一个方法。使用函数**`method_setImplementation`**，你可以将一个方法的实现方式**更改为另一个方法**。
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只需记住，如果你打算在新的实现方式中调用原始方法的实现方式，**请先存储原始方法实现方式的地址**，因为稍后要定位该地址将变得更加复杂。
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```objectivec
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#import <Foundation/Foundation.h>
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#import <objc/runtime.h>
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#import <objc/message.h>
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static IMP original_substringFromIndex = NULL;
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@interface NSString (Swizzlestring)
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- (NSString *)swizzledSubstringFromIndex:(NSUInteger)from;
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@end
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@implementation NSString (Swizzlestring)
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- (NSString *)swizzledSubstringFromIndex:(NSUInteger)from {
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NSLog(@"Custom implementation of substringFromIndex:");
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// Call the original implementation using objc_msgSendSuper
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return ((NSString *(*)(id, SEL, NSUInteger))original_substringFromIndex)(self, _cmd, from);
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}
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@end
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int main(int argc, const char * argv[]) {
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@autoreleasepool {
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// Get the class of the target method
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Class stringClass = [NSString class];
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// Get the swizzled and original methods
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Method originalMethod = class_getInstanceMethod(stringClass, @selector(substringFromIndex:));
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// Get the function pointer to the swizzled method's implementation
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IMP swizzledIMP = method_getImplementation(class_getInstanceMethod(stringClass, @selector(swizzledSubstringFromIndex:)));
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// Swap the implementations
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// It return the now overwritten implementation of the original method to store it
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original_substringFromIndex = method_setImplementation(originalMethod, swizzledIMP);
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// Example usage
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NSString *myString = @"Hello, World!";
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NSString *subString = [myString substringFromIndex:7];
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NSLog(@"Substring: %@", subString);
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// Set the original implementation back
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method_setImplementation(originalMethod, original_substringFromIndex);
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return 0;
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}
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}
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```
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## 钩子攻击方法论
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在本页面中，讨论了不同的函数钩子方式。然而，它们都涉及到在进程内运行代码来进行攻击。
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为了做到这一点，最简单的技术是通过环境变量或劫持来注入[Dyld](../macos-dyld-hijacking-and-dyld\_insert\_libraries.md)。然而，我猜这也可以通过[Dylib进程注入](macos-ipc-inter-process-communication/#dylib-process-injection-via-task-port)来实现。
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然而，这两种选项都**限制**于**未受保护**的二进制文件/进程。请查看每种技术以了解更多限制信息。
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然而，函数钩子攻击非常具体，攻击者会使用这种方法来从进程内部窃取敏感信息（如果不是这样，你只会进行进程注入攻击）。而这些敏感信息可能位于用户下载的应用程序中，如MacPass。
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因此，攻击者的方式要么是找到一个漏洞，要么是剥离应用程序的签名，通过应用程序的Info.plist注入**`DYLD_INSERT_LIBRARIES`**环境变量，添加类似以下内容：
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```xml
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<key>LSEnvironment</key>
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<dict>
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<key>DYLD_INSERT_LIBRARIES</key>
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<string>/Applications/MacPass.app/Contents/malicious.dylib</string>
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</dict>
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```
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在该库中添加挂钩代码以窃取信息：密码、消息...
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## 参考资料
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* [https://nshipster.com/method-swizzling/](https://nshipster.com/method-swizzling/)
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<details>
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<summary><a href="https://cloud.hacktricks.xyz/pentesting-cloud/pentesting-cloud-methodology"><strong>☁️ HackTricks 云 ☁️</strong></a> -<a href="https://twitter.com/hacktricks_live"><strong>🐦 Twitter 🐦</strong></a> - <a href="https://www.twitch.tv/hacktricks_live/schedule"><strong>🎙️ Twitch 🎙️</strong></a> - <a href="https://www.youtube.com/@hacktricks_LIVE"><strong>🎥 Youtube 🎥</strong></a></summary>
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* 你在一家**网络安全公司**工作吗？想要在 HackTricks 中**宣传你的公司**吗？或者想要**获取最新版本的 PEASS 或下载 PDF 格式的 HackTricks**吗？请查看[**订阅计划**](https://github.com/sponsors/carlospolop)！
|
||
* 发现我们的独家[**NFTs**](https://opensea.io/collection/the-peass-family)收藏品——[**The PEASS Family**](https://opensea.io/collection/the-peass-family)
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* 获取[**官方 PEASS & HackTricks 商品**](https://peass.creator-spring.com)
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* **加入**[**💬**](https://emojipedia.org/speech-balloon/) [**Discord 群组**](https://discord.gg/hRep4RUj7f) 或 [**Telegram 群组**](https://t.me/peass)，或者**关注**我在**Twitter**上的[**🐦**](https://github.com/carlospolop/hacktricks/tree/7af18b62b3bdc423e11444677a6a73d4043511e9/\[https:/emojipedia.org/bird/README.md)[**@carlospolopm**](https://twitter.com/hacktricks\_live)**。**
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* **通过向**[**hacktricks 仓库**](https://github.com/carlospolop/hacktricks) **和**[**hacktricks-cloud 仓库**](https://github.com/carlospolop/hacktricks-cloud) **提交 PR 来分享你的黑客技巧。**
|
||
|
||
</details>
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