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fuzz_dhcpc6.c
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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/time.h>
#include <sys/resource.h>
#include <sys/wait.h>
#include <time.h>
#include <pcap.h>
#include <netinet/in.h>
#include <sys/select.h>
#include "thc-ipv6.h"
#define COUNT_FLAG 11
#define COUNT_BYTE 4
#define COUNT_WORD 16
#define COUNT_XOR 2
#define COUNT_EXTEND 256
#define COUNT_DWORD 256
#define NEVER 2000000000
#define TEST_MAX (NEVER - 1)
#define DO_SOL 1
#define DO_ADV 2
#define DO_REQ 3
#define DO_CON 4
#define DO_REN 5
#define DO_REB 6
#define DO_REP 7
#define DO_REL 8
#define DO_DEC 9
#define DO_REC 10
#define DO_NFO 11
#define DO_REL_FOR 12
#define DO_REL_REP 13
/*
* Fuzzing data types:
* F = flags = 1 byte = 8 bits | flags | 8 ; 256
* B = byte = 1 byte | 0 1 254 255 xor XOR | 6 ; 256
* X = byte = 1 byte | all values from 0 to 255
* W = word = 2 bytes | 0,1,254,255^2 xor XOR | 18 ; 65536
* D = double word = 4 bytes | {0,1,254,255}^4 xor XOR | 258 ; 4294967295
* . = byte = ignore, jump over
*
*/
struct OPT {
char tag;
char fuzz[45];
char dont_fuzz[45];
char label[45];
char code[45];
int length;
} options[22] = {
{
'x', "Xx", ".x", "DCHP MESSAGE TYPE", {
0x02}, 1}, {
'y', "BBBy", "...y", "TRANSACTION ID", {
0x00, 0x00, 0x00}, 3}, {
'z', "....WWDWWWz", "..................z", "CLIENTID", {
0x00, 0x01, 0x00, 0x0E, 'C', 'L', 'I', 'E', 'N', 'T', ' ', 'I', 'D', ' ', 'D', 'U', 'I', 'D'}, 18}, {
'a', "....WWDWWWa", "..................a", "SERVERID (a)", {
0x00, 0x02, 0x00, 0x0E, 0x00, 0x01, 0x00, 0x01, 0x1A, 0x62, 0xB6, 0x77, 'D', 'I', 'D', 'U', 'I', 'D'}, 18}, {
'b', "....DDDb", "................b", "IA_NA (b)", {
0x00, 0x03, 0x00, 0x0C, 0x01, 0x02, 0x03, 0x04, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x0A}, 16}, {
'c', "....DWWWWc", "................c", "IA_TA (c)", {
0x00, 0x04, 0x00, 0x0C, 0x01, 0x02, 0x03, 0x04, 0x00, 0x0D, 0x00, 0x04, 0x00, 0x00, 'O', 'K'}, 16}, {
'd', "................DD...Xd", "............................d", "IAADR (d)", {
0x00, 0x05, 0x00, 0x18, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x00, 0x0D, 0x00, 0x00,}, 28}, {
'e', "....XXe", "......e", "ORO (e)", {
0x00, 0x06, 0x00, 0x02, 0x00, 0x08}, 6}, {
'f', "....Xf", ".....f", "PREFERENCE (f)", {
0x00, 0x07, 0x00, 0x01, 0x00}, 5}, {
'g', "....BBg", "......g", "ELAPSED_TIME (g)", {
0x00, 0x08, 0x00, 0x02, 0x10, 0xFF}, 6}, {
'h', ".....BB...............B...............h", "......................................h", "RELAY_MSG (h)", {
0x00, 0x09, 0x00, 0x22, 0x0C, 0x0F, 'L', 'I', 'N', 'K', ' ', 'A', 'D', 'D', 'R', 'E', 'S', 'S', 0x0D, 0x0E, 0x0F, 0x10, 'P', 'E', 'E', 'R', ' ', 'A', 'D', 'D', 'R', 'E',
'S', 'S', 0x0D, 0x0E, 0x0F, 0x10}, 38}, {
'i', "....BBBDD.....DB................i", ".........................................i", "AUTHENTICATION (i)", {
0x00, 0x0B, 0x00, 0x25, 0x00, 0x01, 0x00, 'R', 'E', 'P', 'L', 'A', 'Y', 0x07, 0x08, 'R', 'E', 'A', 'L', 'M', 'K', 'E', 'Y', 0x04, 0x05, 'H', 'M', 'A', 'C', '-', 'M', 'D',
'5', 0x09, 0x0A, 0xB, 0x0C, 0x0D, 0x0E, 0x0F, 0x10}, 41}, {
'j', "....DDDDj", "....................j", "UNICAST (j)", {
0x00, 0x0C, 0x00, 0x10, 'U', 'N', 'I', 'C', 'A', 'S', 'T', ' ', 'A', 'D', 'D', 'R', 'E', 'S', 'S', 0x10}, 20}, {
'k', "....XX..............k", "....................k", "STATUS_CODE (k)", {
0x00, 0x0D, 0x00, 0x10, 0x00, 0x00, 'S', 'T', 'A', 'T', 'U', 'S', ' ', 'M', 'E', 'S', 'S', 'A', 'G', 'E'}, 20}, {
'l', "...Bl", "....l", "RAPID_COMMIT (l)", {
0x00, 0x0E, 0x00, 0x00}, 4}, {
'm', "......Dm", "..........m", "USER_CLASS (m)", {
0x00, 0x0F, 0x00, 0x06, 0x00, 0x04, 'U', 'S', 'E', 'R'}, 10}, {
'n', "....D.......n", "...............n", "VENDOR_CLASS (n)", {
0x00, 0x10, 0x00, 0x0B, 0x00, 0x00, 0x00, 0x00, 0x00, 0x05, 'C', 'L', 'A', 'S', 'S'}, 15}, {
'o', "....D..........o", "..................o", "VENDOR_OPTS (o)", {
0x00, 0x11, 0x00, 0x0E, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x06, 'O', 'P', 'T', 'I', 'O', 'N'}, 18}, {
'p', ".................Bp", "..................p", "INTERFACE_ID (p)", {
0x00, 0x12, 0x00, 0x0E, 'I', 'N', 'T', 'E', 'R', 'F', 'A', 'C', 'E', ' ', 'I', 'D', ' ', ' '}, 18}, {
'q', "....Xq", ".....q", "RECONF_MSG (q)", {
0x00, 0x13, 0x00, 0x01, 0x00}, 5}, {
'r', "....Br", ".....r", "RECONF_ACCEPT (r)", {
0x00, 0x14, 0x00, 0x01, 0x00}, 5}, {
's', "", "", "FUZZING BUFFER ERROR! (s)", {
0x00}, 1},};
unsigned short int words[] = { 0x0000, 0x0001, 0x00fe, 0x00ff, 0x0100, 0x0101,
0x01fe, 0x01ff, 0xfe00, 0xfe01, 0xfefe, 0xfeff, 0xff00, 0xff01, 0xfffe,
0xffff
}; // 16
unsigned int xors[] = { 0, 0xffffffff }; // 2
unsigned char extends[] = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14,
15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33,
34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52,
53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71,
72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90,
91, 92, 93, 94, 95, 96, 97, 98, 99, 100, 101, 102, 103, 104, 105, 106, 107,
108, 109, 110, 111, 112, 113, 114, 115, 116, 117, 118, 119, 120, 121, 122,
123, 124, 125, 126, 127, 128, 129, 130, 131, 132, 133, 134, 135, 136, 137,
138, 139, 140, 141, 142, 143, 144, 145, 146, 147, 148, 149, 150, 151, 152,
153, 154, 155, 156, 157, 158, 159, 160, 161, 162, 163, 164, 165, 166, 167,
168, 169, 170, 171, 172, 173, 174, 175, 176, 177, 178, 179, 180, 181, 182,
183, 184, 185, 186, 187, 188, 189, 190, 191, 192, 193, 194, 195, 196, 197,
198, 199, 200, 201, 202, 203, 204, 205, 206, 207, 208, 209, 210, 211, 212,
213, 214, 215, 216, 217, 218, 219, 220, 221, 222, 223, 224, 225, 226, 227,
228, 229, 230, 231, 232, 233, 234, 235, 236, 237, 238, 239, 240, 241, 242,
243, 244, 245, 246, 247, 248, 249, 250, 251, 252, 253, 254, 255
}; // 256
unsigned int dwords[] = { 0x00000000, 0x00000001, 0x000000fe, 0x000000ff,
0x00000100, 0x00000101, 0x000001fe, 0x000001ff,
0x0000fe00, 0x0000fe01, 0x0000fefe, 0x0000feff,
0x0000ff00, 0x0000ff01, 0x0000fffe, 0x0000ffff,
0x00010000, 0x00010001, 0x000100fe, 0x000100ff,
0x00010100, 0x00010101, 0x000101fe, 0x000101ff,
0x0001fe00, 0x0001fe01, 0x0001fefe, 0x0001feff,
0x0001ff00, 0x0001ff01, 0x0001fffe, 0x0001ffff,
0x00fe0000, 0x00fe0001, 0x00fe00fe, 0x00fe00ff,
0x00fe0100, 0x00fe0101, 0x00fe01fe, 0x00fe01ff,
0x00fefe00, 0x00fefe01, 0x00fefefe, 0x00fefeff,
0x00feff00, 0x00feff01, 0x00fefffe, 0x00feffff,
0x00ff0000, 0x00ff0001, 0x00ff00fe, 0x00ff00ff,
0x00ff0100, 0x00ff0101, 0x00ff01fe, 0x00ff01ff,
0x00fffe00, 0x00fffe01, 0x00fffefe, 0x00fffeff,
0x00ffff00, 0x00ffff01, 0x00fffffe, 0x00ffffff,
0x01000000, 0x01000001, 0x010000fe, 0x010000ff,
0x01000100, 0x01000101, 0x010001fe, 0x010001ff,
0x0100fe00, 0x0100fe01, 0x0100fefe, 0x0100feff,
0x0100ff00, 0x0100ff01, 0x0100fffe, 0x0100ffff,
0x01010000, 0x01010001, 0x010100fe, 0x010100ff,
0x01010100, 0x01010101, 0x010101fe, 0x010101ff,
0x0101fe00, 0x0101fe01, 0x0101fefe, 0x0101feff,
0x0101ff00, 0x0101ff01, 0x0101fffe, 0x0101ffff,
0x01fe0000, 0x01fe0001, 0x01fe00fe, 0x01fe00ff,
0x01fe0100, 0x01fe0101, 0x01fe01fe, 0x01fe01ff,
0x01fefe00, 0x01fefe01, 0x01fefefe, 0x01fefeff,
0x01feff00, 0x01feff01, 0x01fefffe, 0x01feffff,
0x01ff0000, 0x01ff0001, 0x01ff00fe, 0x01ff00ff,
0x01ff0100, 0x01ff0101, 0x01ff01fe, 0x01ff01ff,
0x01fffe00, 0x01fffe01, 0x01fffefe, 0x01fffeff,
0x01ffff00, 0x01ffff01, 0x01fffffe, 0x01ffffff,
0xfe000000, 0xfe000001, 0xfe0000fe, 0xfe0000ff,
0xfe000100, 0xfe000101, 0xfe0001fe, 0xfe0001ff,
0xfe00fe00, 0xfe00fe01, 0xfe00fefe, 0xfe00feff,
0xfe00ff00, 0xfe00ff01, 0xfe00fffe, 0xfe00ffff,
0xfe010000, 0xfe010001, 0xfe0100fe, 0xfe0100ff,
0xfe010100, 0xfe010101, 0xfe0101fe, 0xfe0101ff,
0xfe01fe00, 0xfe01fe01, 0xfe01fefe, 0xfe01feff,
0xfe01ff00, 0xfe01ff01, 0xfe01fffe, 0xfe01ffff,
0xfefe0000, 0xfefe0001, 0xfefe00fe, 0xfefe00ff,
0xfefe0100, 0xfefe0101, 0xfefe01fe, 0xfefe01ff,
0xfefefe00, 0xfefefe01, 0xfefefefe, 0xfefefeff,
0xfefeff00, 0xfefeff01, 0xfefefffe, 0xfefeffff,
0xfeff0000, 0xfeff0001, 0xfeff00fe, 0xfeff00ff,
0xfeff0100, 0xfeff0101, 0xfeff01fe, 0xfeff01ff,
0xfefffe00, 0xfefffe01, 0xfefffefe, 0xfefffeff,
0xfeffff00, 0xfeffff01, 0xfefffffe, 0xfeffffff,
0xff000000, 0xff000001, 0xff0000fe, 0xff0000ff,
0xff000100, 0xff000101, 0xff0001fe, 0xff0001ff,
0xff00fe00, 0xff00fe01, 0xff00fefe, 0xff00feff,
0xff00ff00, 0xff00ff01, 0xff00fffe, 0xff00ffff,
0xff010000, 0xff010001, 0xff0100fe, 0xff0100ff,
0xff010100, 0xff010101, 0xff0101fe, 0xff0101ff,
0xff01fe00, 0xff01fe01, 0xff01fefe, 0xff01feff,
0xff01ff00, 0xff01ff01, 0xff01fffe, 0xff01ffff,
0xfffe0000, 0xfffe0001, 0xfffe00fe, 0xfffe00ff,
0xfffe0100, 0xfffe0101, 0xfffe01fe, 0xfffe01ff,
0xfffefe00, 0xfffefe01, 0xfffefefe, 0xfffefeff,
0xfffeff00, 0xfffeff01, 0xfffefffe, 0xfffeffff,
0xffff0000, 0xffff0001, 0xffff00fe, 0xffff00ff,
0xffff0100, 0xffff0101, 0xffff01fe, 0xffff01ff,
0xfffffe00, 0xfffffe01, 0xfffffefe, 0xfffffeff,
0xffffff00, 0xffffff01, 0xfffffffe, 0xffffffff
}; // 256
char tribyte_id[4] = { 0, 0, 0, 0 };
int fdebug = 0;
unsigned char *dst;
unsigned char flags[] = { 0, 1, 2, 4, 8, 16, 32, 64, 128, 254, 255 }; // 11
unsigned char bytes[] = { 0, 1, 254, 255 }; // 4
char mac[6] = { 0, 0x0c, 0, 0, 0, 0 }, *pkt = NULL; // defines mac as 6 pieces and defines pkt as null.
char wdatabuf[2048]; //builds data buffer and sets memory size at 1024mb
unsigned char *mac6 = mac, *src; //creates mac6 address usuing
int i, s, len, pkt_len = 0, dlen = 0;
int do_all = 1, use_real_mac = 1, use_real_link = 1;
int port = -1;
int listen_for_clients = 1;
char victim[128] = "fe80::20c:29ff:fe3f:e572";
int cidflag = 0;
int oflg = 0;
int f_cnt = 0;
int p_cnt = 0;
unsigned char cid[14] = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
int lidx = 0;
char mac_fuzz[] = "..............";
char ipv6_fuzz[] = "........................................";
char udp_header_fuzz[] = "........";
char option_string[100] = "abcdefghijklmnopqr";
char fuzzing_mask[512];
char *interface = NULL;
int test_start = 0, test_end = TEST_MAX, ping = NEVER, no_send = 1, got_packet = 0;
int xid = 0;
pcap_t *p = NULL;
int do_type = DO_ADV, fuzz_dhcp_msg = 0;
unsigned char rdatabuf[1024];
unsigned char *ptr1, *ptr2;
static struct iovec iov;
struct sockaddr_storage from;
struct msghdr mhdr;
struct sockaddr_in6 ddst;
char cmsgbuf[1024];
int fromlen = 0, len, s, t;
void help(char *prg) {
printf("%s %s (c) 2016 by %s %s\n", prg, VERSION, "Darrell Ambro", RESOURCE);
printf("Partially based on code by Brandon Hutcheson and Graeme Neilson\n\n");
printf("Syntax: %s [-1|-2|-3|-4|-5|-6|-7|-8|-9|-A|-B|-C|-D|-m] -f mac -l link -v ipv6 -x xid -c client -o options interface\n\n", prg);
printf("Options:\n");
printf(" -1 fuzz DHCPv6 Solicit\n");
printf(" -2 fuzz DHCPv6 Advertise (default)\n");
printf(" -3 fuzz DHCPv6 Request\n");
printf(" -4 fuzz DHCPv6 Confirm\n");
printf(" -5 fuzz DHCPv6 Renew\n");
printf(" -6 fuzz DHCPv6 Rebind\n");
printf(" -7 fuzz DHCPv6 Reply\n");
printf(" -8 fuzz DHCPv6 Release\n");
printf(" -9 fuzz DHCPv6 Decline\n");
printf(" -A fuzz DHCPv6 Reconfigure\n");
printf(" -B fuzz DHCPv6 Information Request\n");
printf(" -C fuzz DHCPv6 Relay-Forward\n");
printf(" -D fuzz DHCPv6 Relay-reply\n");
printf(" -m fuzz the message type as well\n");
printf(" -v ipv6 IPv6 address of victim (if not specified DHCP clients sending messages are attacked)\n");
printf(" -x xid Transaction ID of victim - zero for random (ignored if -v not specified) \n");
printf(" -c client Client ID of victim - zero for random (ignored if -v not specified) \n");
printf(" -f mac spoof the mac address\n");
printf(" -l link spoof the link address\n");
printf(" -o options DHCPv6 message options to send (default: abcdefghijklmonpqr)\n");
printf(" a OPTION_SERVERID\n");
printf(" b OPTION_IA_NA\n");
printf(" c OPTION_IA_TA\n");
printf(" d OPTION_IAADR\n");
printf(" e OPTION_ORO\n");
printf(" f OPTION_PREFERENCE\n");
printf(" g OPTION_ELAPSED_TIME\n");
printf(" h OPTION_RELAY_MSG\n");
printf(" i OPTION_AUTH\n");
printf(" j OPTION_UNICAST\n");
printf(" k OPTION_STATUS_CODE\n");
printf(" l OPTION_RAPID_COMMIT\n");
printf(" m OPTION_USER_CLASS\n");
printf(" n OPTION_VENDOR_CLASS\n");
printf(" o OPTION_VENDOR_OPTS\n");
printf(" p OPTION_INTERFACE_ID\n");
printf(" q OPTION_RECONF_MSG\n");
printf(" r OPTION_RECONF_ACCEPT\n");
printf("\nFuzz messages sent to a DHCPv6 client\n");
exit(-1);
}
int fuzz_loop(char *pkt, int *pkt_len) {
int do_fuzz = 1;
int test_pos = 0, test_ptr = 0, test_cnt = 0, test_current = 0;
int do_it;
int i;
unsigned short int *sip;
unsigned int *intp;
int fragment = 0, frag_offset = 0;
unsigned char *pkt_bak;
thc_ipv6_hdr *hdr = (thc_ipv6_hdr *) pkt;
// backup of generated packet
pkt_bak = malloc(hdr->pkt_len);
memcpy(pkt_bak, hdr->pkt, hdr->pkt_len);
if (fdebug)
printf("fuzzing_mask(%d): %s\n", strlen(fuzzing_mask), fuzzing_mask);
if (fdebug)
printf("Victim: %s\n", victim);
while (do_fuzz) {
if (test_cnt == 0)
while (fuzzing_mask[test_ptr] == '.') {
test_ptr++;
test_pos++;
}
if ((int) fuzzing_mask[test_ptr] >= 'a') {
for (lidx = 0; lidx < 21; ++lidx)
if (fuzzing_mask[test_ptr] == options[lidx].tag)
break;
if (f_cnt == 0) {
printf("%s not fuzzed\n", options[lidx].label);
} else {
if (options[lidx].tag < 's' || options[lidx].tag == 'z')
printf("OPTION_%s %d messages (%d)\n", options[lidx].label, f_cnt, p_cnt + f_cnt);
else
printf("%s %d messages (%d)\n", options[lidx].label, f_cnt, p_cnt + f_cnt);
}
test_ptr++;
p_cnt += f_cnt;
f_cnt = 0;
continue;
}
if (fuzzing_mask[test_ptr] == 0)
do_fuzz = 0;
test_cnt++;
do_it = 1;
if (fdebug)
printf("fuzzing_mask[%d]: %c\n", test_ptr, fuzzing_mask[test_ptr]);
switch (fuzzing_mask[test_ptr]) {
case 0:
break;
case 'X':
if (test_cnt <= COUNT_EXTEND) {
if (pkt_bak[test_pos] != extends[test_cnt - 1])
hdr->pkt[test_pos] = extends[test_cnt - 1];
else
do_it = 0;
} else {
test_cnt = 0;
test_ptr++;
test_pos++;
}
break;
case 'B':
if (test_cnt <= COUNT_BYTE) {
if (pkt_bak[test_pos] != bytes[test_cnt - 1])
hdr->pkt[test_pos] = bytes[test_cnt - 1];
else
do_it = 0;
} else {
i = 0;
while (i < COUNT_BYTE && do_it) {
if (bytes[i] == pkt_bak[test_pos])
do_it = 0;
i++;
}
if (do_it)
hdr->pkt[test_pos] = hdr->pkt[test_pos] ^ xors[test_cnt - COUNT_BYTE - 1];
}
if (test_cnt == COUNT_BYTE + COUNT_XOR) {
test_cnt = 0;
test_ptr++;
test_pos++;
}
break;
case 'F':
if (test_cnt <= COUNT_FLAG) {
if (pkt_bak[test_pos] != flags[test_cnt - 1])
hdr->pkt[test_pos] = flags[test_cnt - 1];
else
do_it = 0;
} else {
i = 0;
while (i < COUNT_FLAG && do_it) {
if (bytes[i] == pkt_bak[test_pos]) // yes, bytes[] is the right one even for flags
do_it = 0;
i++;
}
if (do_it)
hdr->pkt[test_pos] = hdr->pkt[test_pos] ^ xors[test_cnt - COUNT_BYTE - 1];
}
if (test_cnt == COUNT_FLAG + COUNT_XOR) {
test_cnt = 0;
test_ptr++;
test_pos++;
}
break;
case 'W':
sip = (unsigned short int *) &pkt_bak[test_pos];
if (test_cnt <= COUNT_WORD) {
if (*sip != words[test_cnt - 1])
memcpy((char *) &hdr->pkt[test_pos], (char *) &words[test_cnt - 1], 2);
else
do_it = 0;
} else {
i = 0;
while (i < COUNT_WORD && do_it) {
if (words[i] == *sip)
do_it = 0;
i++;
}
if (do_it) {
i = *sip ^ xors[test_cnt - COUNT_WORD - 1];
sip = (unsigned short int *) &hdr->pkt[test_pos];
*sip = i % 65536;
}
}
if (test_cnt == COUNT_WORD + COUNT_XOR) {
test_cnt = 0;
test_ptr++;
test_pos += 2;
}
break;
case 'D':
intp = (unsigned int *) &pkt_bak[test_pos];
if (test_cnt <= COUNT_DWORD) {
if (*intp != dwords[test_cnt - 1])
memcpy((char *) &hdr->pkt[test_pos], (char *) &dwords[test_cnt - 1], 4);
else
do_it = 0;
} else {
i = 0;
while (i < COUNT_DWORD && do_it) {
if (dwords[i] == *intp)
do_it = 0;
i++;
}
if (do_it) {
i = *intp ^ xors[test_cnt - COUNT_DWORD - 1];
intp = (unsigned int *) &hdr->pkt[test_pos];
*intp = (unsigned int) i;
// *intp = (unsigned int) (i % 4294967295);
}
}
if (test_cnt == COUNT_DWORD + COUNT_XOR) {
test_cnt = 0;
test_ptr++;
test_pos += 4;
}
break;
default:
fprintf(stderr, "This character should not be in the fuzz string: %c(%d) position %d string %s\n", fuzzing_mask[test_ptr], fuzzing_mask[test_ptr], test_ptr, fuzzing_mask);
return -1;
break;
}
if (do_it && do_fuzz) {
if (test_current >= test_start && test_current <= test_end && do_fuzz) {
// Generate new transaction id
if (xid == 0) {
int three_byte_test_current = test_current % 0x1000000;
memcpy(hdr->pkt + 63, (char *) &three_byte_test_current, 3);
}
// Regenerate UDP checksum
hdr->pkt[60] = 0;
hdr->pkt[61] = 0;
i = checksum_pseudo_header(hdr->original_src, hdr->final_dst, NXT_UDP, &hdr->pkt[54], hdr->pkt_len - 54);
hdr->pkt[60] = i / 256;
hdr->pkt[61] = i % 256;
// send packets
int k;
for (k = 0; k < no_send; k++) {
if (fdebug)
fprintf(stderr, "send it\n");
while (thc_send_pkt(interface, pkt, pkt_len) < 0)
usleep(1);
}
// printf(".");
usleep(250);
++f_cnt;
}
// reset to basic packet
memcpy(hdr->pkt, pkt_bak, hdr->pkt_len);
test_current++;
}
}
}
dhcpc_listener() {
if ((s = thc_bind_udp_port(547)) < 0) {
fprintf(stderr, "Error: could not bind to 547/udp\n");
exit(-1);
}
if (thc_bind_multicast_to_socket(s, interface, thc_resolve6("ff02::1:2")) < 0) {
fprintf(stderr, "Error: could not bind multicast address\n");
exit(-1);
}
if ((t = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) {
perror("Error:");
exit(-1);
}
if (p_cnt > 0) {
printf("%d messages sent\n", p_cnt);
p_cnt = 0;
}
printf("\nListening for DHCPv6 clients on %s (Press Control-C to end) ...\n\n", interface);
while (1) {
memset((char *) &from, 0, sizeof(from));
memset(&iov, 0, sizeof(iov));
memset(&mhdr, 0, sizeof(mhdr));
iov.iov_base = rdatabuf;
iov.iov_len = sizeof(rdatabuf);
mhdr.msg_name = &from;
mhdr.msg_namelen = sizeof(from);
mhdr.msg_iov = &iov;
mhdr.msg_iovlen = 1;
mhdr.msg_control = (caddr_t) cmsgbuf;
mhdr.msg_controllen = sizeof(cmsgbuf);
if ((len = recvmsg(s, &mhdr, 0)) > 0) {
fromlen = mhdr.msg_namelen;
if (fdebug)
thc_dump_data(rdatabuf, len, "Received Packet");
ddst.sin6_addr = ((struct sockaddr_in6 *) mhdr.msg_name)->sin6_addr;
ptr2 = thc_ipv62notation((char *) &ddst.sin6_addr);
printf("\nReceived DHCPv6 Type %d message from %s\n", rdatabuf[0], ptr2);
strncpy((char *) &victim, ptr2, sizeof(victim));
free(ptr2);
dst = thc_resolve6(victim);
/* get xid and cid */
tribyte_id[2] = rdatabuf[1];
tribyte_id[1] = rdatabuf[2];
tribyte_id[0] = rdatabuf[3];
printf("Transaction ID: %x%x%x\n", rdatabuf[1], rdatabuf[2], rdatabuf[3]);
xid = 1;
int roffset = 5;
while (roffset < len) {
if (rdatabuf[roffset] != 1) {
/* skip option */
if (fdebug)
printf("%d option %d length %d\n", roffset, (int) rdatabuf[roffset], (int) rdatabuf[roffset + 2]);
roffset += (int) rdatabuf[roffset + 2];
roffset += 4;
continue;
}
if (rdatabuf[roffset + 4] != 1) {
fprintf(stderr, "Can only reply to clients using DUID Type 1\n");
break;
}
if (rdatabuf[roffset + 3] == 0x00 && rdatabuf[roffset + 4] == 0x01) {
cidflag = 1;
memcpy(cid, &rdatabuf[roffset + 3], 14);
if (fdebug)
printf("got it!\n");
break;
}
}
printf("Client ID: %02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x\n", cid[0], cid[1], cid[2], cid[3], cid[4], cid[5], cid[6], cid[7], cid[8], cid[9], cid[10],
cid[11], cid[12], cid[13]);
if (oflg)
printf("Options: %s\n", option_string);
printf("\nFields Fuzzed:\n\n");
do_fuzzer();
printf("\n\nListening for DHCPv6 clients on %s (Press Control-C to end) ...\n\n", interface);
f_cnt = 0;
} /* Received */
} /* while */
}
int main(int argc, char *argv[]) {
if (argc < 2 || strncmp(argv[1], "-h", 2) == 0)
help(argv[0]);
if (getenv("THC_IPV6_PPPOE") != NULL || getenv("THC_IPV6_6IN4") != NULL)
printf("WARNING: %s is not working with injection!\n", argv[0]);
//Parse options
memset(cid, 0, 14); /* clear cid */
while ((i = getopt(argc, argv, "123456789ABCDmn:t:e:T:dlp:frv:x:c:o:")) >= 0) {
switch (i) {
case '1':
do_type = DO_SOL;
break;
case '2':
do_type = DO_ADV;
break;
case '3':
do_type = DO_REQ;
break;
case '4':
do_type = DO_CON;
break;
case '5':
do_type = DO_REN;
break;
case '6':
do_type = DO_REB;
break;
case '7':
do_type = DO_REP;
break;
case '8':
do_type = DO_REL;
break;
case '9':
do_type = DO_DEC;
break;
case 'A':
do_type = DO_REC;
break;
case 'B':
do_type = DO_NFO;
break;
case 'C':
do_type = DO_REL_FOR;
break;
case 'D':
do_type = DO_REL_REP;
break;
case 'm':
fuzz_dhcp_msg = 1;
break;
case 'n':
no_send = atoi(optarg);
break;
case 't':
test_start = atoi(optarg);
break;
case 'e':
test_end = atoi(optarg);
break;
case 'T':
test_end = test_start = atoi(optarg);
break;
case 'l':
use_real_link = 0; // no break
case 'f':
use_real_mac = 0;
break;
case 'p':
ping = atoi(optarg);
break;
case 'd':
fdebug = 1;
case 'r':
i = 0;
break; // just to ignore -r
case 'v':
strncpy((char *) &victim, optarg, sizeof(victim));
listen_for_clients = 0;
break;
case 'o':
oflg = 1;
strncpy((char *) &option_string, optarg, sizeof(option_string));
break;
case 'x':
sscanf(optarg, "%x", &xid);
break;
case 'c':
cidflag = 1;
sscanf(optarg, "%2x%2x%2x%2x%2x%2x%2x%2x%2x%2x%2x%2x%2x%2x", (char *) &cid[0], (char *) &cid[1], (char *) &cid[2], (char *) &cid[3], (char *) &cid[4], (char *) &cid[5],
(char *) &cid[6], (char *) &cid[7], (char *) &cid[8], (char *) &cid[9], (char *) &cid[10], (char *) &cid[11], (char *) &cid[12], (char *) &cid[13]);
break;
default:
fprintf(stderr, "Error: unknown option -%c\n", i);
exit(-1);
}
}
//Check options
if (no_send < 1) {
fprintf(stderr, "ERROR: -n number must be between one and 2 billion\n");
exit(-1);
}
if (test_end < test_start) {
printf("dont fuck up the command line options!\n");
exit(-1);
}
memset(mac, 0, sizeof(mac));
interface = argv[optind];
if (interface == NULL) {
fprintf(stderr, "interface required\n");
exit(0);
}
if (use_real_link)
src = thc_get_own_ipv6(interface, NULL, PREFER_LINK);
else
src = thc_resolve6("fe80::");
if (use_real_mac) {
mac6 = thc_get_own_mac(interface);
memcpy(mac, mac6, sizeof(mac));
}
setvbuf(stdout, NULL, _IONBF, 0);
setvbuf(stderr, NULL, _IONBF, 0);
if (listen_for_clients)
dhcpc_listener();
else
dst = thc_resolve6(victim);
// only to prevent our system to send icmp port unreachable messages
if ((s = thc_bind_udp_port(547)) < 0)
fprintf(stderr, "Warning: could not bind to 547/udp\n");
if ((p = thc_pcap_init_promisc(interface, "ip6 and udp and dst port 547")) == NULL) {
fprintf(stderr, "Error: can not open interface %s in promisc mode\n", interface);
exit(-1);
}
printf("\nVictim: %s\n", victim);
if (xid)
printf("Transaction ID: %x\n", xid);
if (cidflag)
printf("Client ID: %02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x\n", cid[0], cid[1], cid[2], cid[3], cid[4], cid[5], cid[6], cid[7], cid[8], cid[9], cid[10],
cid[11], cid[12], cid[13]);
if (oflg)
printf("Options: %s\n", option_string);
printf("\nFields Fuzzed:\n\n");
do_fuzzer();
}
int do_fuzzer() {
char *ptr;
int bad_length = 0;
// Generate fuzzing mask and packet
memset((char *) &fuzzing_mask, 0, 256); /* clear fuzzing mask */
memset((char *) &wdatabuf, 0, 1024); /* clear message buffer */
strcat(fuzzing_mask, mac_fuzz); /* Don't fuzz MAC */
strcat(fuzzing_mask, ipv6_fuzz); /* Don't fuzz target IPv6 address */
strcat(fuzzing_mask, udp_header_fuzz); /* Don't fuzz UDP header */
if (fuzz_dhcp_msg == 0) {
options[0].code[0] = do_type;
strcat(fuzzing_mask, options[0].dont_fuzz);
} else
strcat(fuzzing_mask, options[0].fuzz);
wdatabuf[0] = options[0].code[0];
// Transaction ID
if (xid > 0) {
if (listen_for_clients == 0)
memcpy(tribyte_id, (char *) &xid, 3);
options[1].code[0] = tribyte_id[2];
options[1].code[1] = tribyte_id[1];
options[1].code[2] = tribyte_id[0];
strcat(fuzzing_mask, options[1].dont_fuzz);
} else
strcat(fuzzing_mask, options[1].fuzz);
memcpy((char *) &wdatabuf[1], options[1].code, options[1].length);
// Load client ID
memcpy((char *) &options[2].code[4], cid, 14);
if (cidflag == 0)
strcat(fuzzing_mask, options[2].fuzz);
else
strcat(fuzzing_mask, options[2].dont_fuzz);
memcpy((char *) &wdatabuf[4], options[2].code, options[2].length);
// Insert time stamp and MAC in Server ID option
double secs;
secs = time(NULL);
memcpy((char *) &options[3].code[8], (char *) &secs, 4); /* time stamp */
memcpy((char *) &options[3].code[12], thc_get_own_mac(interface), 6);
int optx = 0;
int opt_off = 22;
ptr = option_string;
while (*ptr) {
if (*ptr < 'a' || *ptr > 'r') {
++ptr;
continue;
}
if (*ptr == 'L') {
bad_length = 1;
++ptr;
continue;
}
for (optx = 0; optx < 21; optx++)
if (*ptr == options[optx].tag)
break;
if (bad_length) {
options[optx].fuzz[2] = 'B';
options[optx].fuzz[3] = 'B';
bad_length = 0;
}
strcat(fuzzing_mask, options[optx].fuzz);
memcpy((char *) &wdatabuf[opt_off], options[optx].code, options[optx].length);
opt_off += options[optx].length;
++ptr;
}
if (fdebug)
printf("%s\n", fuzzing_mask);
if (!use_real_link)
for (i = 0; i < 8; i++)
src[i + 8] = rand() % 256;
if (!use_real_mac) {
mac[i * 2] = rand() % 256;
mac[i * 2 + 1] = rand() % 256;
}
if ((pkt = thc_create_ipv6_extended(interface, PREFER_LINK, &pkt_len, src, dst, 1, 0, 0, 0, 0)) == NULL) {
fprintf(stderr, "Can't create IPv6 Extended\n");
return -1;
}
if (thc_add_udp(pkt, &pkt_len, 547, 546, 0, wdatabuf, opt_off) < 0) {
fprintf(stderr, "Can't add UDP\n");
return -1;
}
if (thc_generate_pkt(interface, mac6, NULL, pkt, &pkt_len) < 0) {
fprintf(stderr, "Can't generate packet\n");
return -1;
}
// Fuzz DHCPv6 Messgage and Send It
if (fuzz_loop(pkt, &pkt_len) < 0)
return -1;
pkt = thc_destroy_packet(pkt);
return 0;
}