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231 lines (190 loc) · 6.77 KB
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#include "env64_inject.h"
#include "ptrace_arm64_utils.h"
#include "maps_helper.h"
#include "super_root.h"
#include <stdio.h>
#include <stdlib.h>
#include <dirent.h>
#include <unistd.h>
#include <string.h>
#include <asm/ptrace.h>
#include <sys/ptrace.h>
#include <sys/mman.h>
#include <sys/wait.h>
//安卓
const char *libc64_path1 = "/apex/com.android.runtime/lib64/bionic/libc.so";
const char *linker64_path1 = "/apex/com.android.runtime/bin/linker64";
//Linux
const char *libc64_path2 = "/system/lib64/libc.so";
const char *linker64_path2 = "/system/bin/linker64";
ssize_t inject_process_env64_PATH(int target_pid, const char *lpszAddPath)
{
size_t write_len = strlen(lpszAddPath) + 1;
size_t input_env_buf_size = getpagesize();
ssize_t ret = -1;
void *mmap_addr, *munmap_addr, *setresuid_addr, *getenv_addr, *putenv_addr;
uint8_t *map_base;
struct pt_regs regs, original_regs;
unsigned long parameters[10];
char zero = '\x00';
char *default_libc64_path = (char*)libc64_path1;
const char * str_flag_path = "PATH";
char * ret_getenv = NULL;
size_t tmp_read_byte_index = 0;
char tmp_read_byte[2] = { 0 };
char cur_path[0x1000] = { 0 };
//将要注入的cmd命令写入前面mmap出来的内存
if (write_len > input_env_buf_size) { //输入命令太长了
write_len = input_env_buf_size;
}
TRACE("[+] Injecting process: %d\n", target_pid);
//①ATTATCH，指定目标进程，开始调试
if (ptrace_attach(target_pid) == -1)
{
goto _ret;
}
//②GETREGS，获取目标进程的寄存器，保存现场
if (ptrace_getregs(target_pid, ®s) == -1)
{
goto _deatch;
}
/* save original registers */
memcpy(&original_regs, ®s, sizeof(regs));
//③通过get_remote_addr函数获取目的进程的mmap函数的地址，以便为libxxx.so分配内存
/*
需要对(void*)mmap进行说明：这是取得inject本身进程的mmap函数的地址，由于mmap函数在libc.so
库中，为了将libxxx.so加载到目的进程中，就需要使用目的进程的mmap函数，所以需要查找到libc.so库在目的进程的起始地址。
*/
mmap_addr = get_remote_addr(target_pid, default_libc64_path, (void *)mmap);
if (!mmap_addr)
{
default_libc64_path = (char*)libc64_path2;
TRACE("[+] choice select libc64: %s\n", default_libc64_path);
mmap_addr = get_remote_addr(target_pid, default_libc64_path, (void *)mmap);
if (!mmap_addr) {
TRACE("[+] target process not found libc64: %d\n", target_pid);
goto _deatch;
}
}
munmap_addr = get_remote_addr(target_pid, default_libc64_path, (void *)munmap);
setresuid_addr = get_remote_addr(target_pid, default_libc64_path, (void *)setresuid);
getenv_addr = get_remote_addr(target_pid, default_libc64_path, (void *)getenv);
putenv_addr = get_remote_addr(target_pid, default_libc64_path, (void *)putenv);
TRACE("[+] Remote mmap address: %p\n", mmap_addr);
TRACE("[+] Remote munmap address: %p\n", munmap_addr);
TRACE("[+] Remote setresuid address: %p\n", setresuid_addr);
TRACE("[+] Remote getenv address: %p\n", getenv_addr);
TRACE("[+] Remote putenv address: %p\n", putenv_addr);
/* call mmap (null, 0x4000, PROT_READ | PROT_WRITE | PROT_EXEC,
MAP_ANONYMOUS | MAP_PRIVATE, 0, 0);
匿名申请一块0x4000大小的内存
*/
parameters[0] = 0; // addr
parameters[1] = (unsigned long)(input_env_buf_size); // size
parameters[2] = PROT_READ | PROT_WRITE | PROT_EXEC; // prot
parameters[3] = MAP_ANONYMOUS | MAP_PRIVATE; // flags
parameters[4] = 0; //fd
parameters[5] = 0; //offset
if (ptrace_call_wrapper(target_pid, "mmap", mmap_addr, parameters, 6, ®s) == -1)
{
goto _recovery;
}
//⑤从寄存器中获取mmap函数的返回值，即申请的内存首地址：
map_base = (uint8_t *)ptrace_retval(®s);
//写PATH标志进mmap出来的内存
ptrace_writedata(target_pid, map_base, (uint8_t *)str_flag_path, strlen(str_flag_path) + 1);
parameters[0] = (unsigned long)map_base;
//执行getenv，等于getenv("PATH");
if (ptrace_call_wrapper(target_pid, "getenv", getenv_addr, parameters, 1, ®s) == -1)
{
goto _recovery;
}
ret_getenv = (char *)ptrace_retval(®s);
if (!ret_getenv) {
//getenv error
TRACE("getenv error\n");
goto _recovery;
}
strcat(cur_path, "PATH=");
do
{
tmp_read_byte[0] = '\x00';
ptrace_readdata(target_pid, (uint8_t *)((size_t)ret_getenv + tmp_read_byte_index), (uint8_t *)&tmp_read_byte, 1);
tmp_read_byte_index++;
strcat(cur_path, tmp_read_byte);
if (tmp_read_byte_index >= sizeof(cur_path) - write_len - 1) {
break;
}
} while (tmp_read_byte[0] != '\x00');
strcat(cur_path, ":");
strcat(cur_path, lpszAddPath);
TRACE("[+] Remote cur path: %s\n", cur_path);
//写PATH变量进mmap出来的内存
ptrace_writedata(target_pid, map_base, (uint8_t *)cur_path, strlen(cur_path) + 1);
//执行putenv，等于putenv("XXXXX");
if (ptrace_call_wrapper(target_pid, "putenv", putenv_addr, parameters, 1, ®s) == -1)
{
goto _recovery;
}
if (ptrace_retval(®s)) {
//putenv error
TRACE("putenv error\n");
goto _recovery;
}
////解除绑定内存（不知道为什么解除内存绑定会导致对方程序crash）
//parameters[0] = (unsigned long)map_base;// addr
//parameters[1] = (unsigned long)(input_env_buf_size); // size
//if (ptrace_call_wrapper(target_pid, "munmap", munmap_addr, parameters, 2, ®s) == -1)
//{
// goto _recovery;
//}
ret = 0;
//TRACE("Press enter to detach\n");
//getchar();
/* restore */
//⑪恢复现场并退出ptrace:
_recovery: ptrace_setregs(target_pid, &original_regs);
_deatch:ptrace_detach(target_pid);
_ret: return ret;
}
ssize_t inject_process_env64_PATH_wrapper(unsigned long rootKey, int target_pid, const char *lpszAddPath)
{
if (get_root(rootKey) != 0) {
return -1;
}
if (inject_process_env64_PATH(target_pid, lpszAddPath) != 0) {
return -3;
}
return 0;
}
ssize_t safe_inject_process_env64_PATH_wrapper(unsigned long rootKey, int target_pid, const char *lpszAddPath)
{
int fd[2];
if (pipe(fd))
{
return -4;
}
pid_t pid;
if ((pid = fork()) < 0) {
//fork error
return -5;
}
else if (pid == 0) { /* 子进程 */
close(fd[0]); //close read pipe
int ret = inject_process_env64_PATH_wrapper(rootKey, target_pid, lpszAddPath);
write(fd[1], &ret, sizeof(ret));
close(fd[1]); //close write pipe
exit(0);
}
else { /*父进程*/
close(fd[1]); //close write pipe
int status;
/* 等待目标进程停止或终止. WUNTRACED - 解释见参考手册 */
if (waitpid(pid, &status, WUNTRACED) < 0) { return -6; }
int ret = -7;
read(fd[0], (void*)&ret, sizeof(ret));
close(fd[0]); //close read pipe
return ret;
}
return -8;
}