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fuzz_ip6.c
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fuzz_ip6.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 "thc-ipv6.h"
/*
* 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
*/
char fuzztype_ether[] = "..............";
char fuzztype_ip6[] = "XF..WXBXX..............XX..............";
char fuzztype_ip6no[] = "........................................";
char fuzztype_icmp6[] = "XX..";
char fuzztype_icmp6no[] = "....";
char fuzztype_icmp6ping[] = "";
char fuzztype_icmp6ra[] =
"........XXWWWXXXX........XX.............XXXX....XXXXXBB..XX............."
"XXXBB....XX.............XXXBB....X...X....XX.....X......XXXXXXXXX";
char fuzztype_icmp6ns[] = "XX..XX............XXXX";
char fuzztype_icmp6na[] = "FFFFXX............XXXX";
char fuzztype_icmp6nq[] = "FXFX........XX............XX";
char fuzztype_icmp6mld[] = "WWXXXX............XX";
char fuzztype_icmp6mld2rep[] =
"WFFXFFF................................................XFFF..............."
".................................XFFF....................................."
"...........";
char fuzztype_icmp6mld2que[] = "WWXXXX............XXFWFF";
char fuzztype_tcp[] = "WWWWWWXXWWWXXWXXXXXXWWWWXX";
char fuzztype_pim_hello[] =
"X....X.X..WW...BXXXX.....X.XX....X.XXXBB.............B";
char fuzztype_pim_bootstrap[] =
"X...XX..................XXXXX...............XXXXXX................XX";
char fuzztype_pim_assert[] =
"X...XXXXX...............XX.X.............XX.......";
unsigned char flags[] = {0, 1, 2, 4, 8, 16, 32, 64, 128, 254, 255}; // 11
unsigned char bytes[] = {0, 1, 254, 255}; // 4
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
#define arraysize(a) (sizeof(a) / sizeof(a[0]))
#define COUNT_FLAG arraysize(flags)
#define COUNT_BYTE arraysize(bytes)
#define COUNT_WORD arraysize(words)
#define COUNT_XOR arraysize(xors)
#define COUNT_EXTEND arraysize(extends)
#define NEVER 2000000000
#define TEST_MAX (NEVER - 1)
#define DO_NONE 0
#define DO_PING 1
#define DO_NEIGHSOL 2
#define DO_NEIGHADV 3
#define DO_RA 4
#define DO_NODEQUERY 5
#define DO_TCP 6
#define DO_MLD_REP 131
#define DO_MLD_DONE 132
#define DO_MLD_QUERY 130
#define DO_MLD2_QUERY 256
#define DO_MLD2_REPORT 143
#define DO_PIM_HELLO 65536
#define DO_PIM_BOOTSTRAP 65540
#define DO_PIM_ASSERT 65541
int port = -1;
void help(char *prg) {
printf("%s %s (c) 2022 by %s %s\n\n", prg, VERSION, AUTHOR, RESOURCE);
printf(
"Syntax: %s [-x] [-t number | -T number] [-p number] [-IFSDHRJ] "
"[-X|-1|-2|-3|-4|-5|-6|-7|-8|-9|-0 port|-P type] interface "
"unicast-or-multicast-address [address-in-data-pkt]\n\n",
prg);
printf("Fuzzes an IPv6 packet with optional EHs and upper layer transport\n");
printf("Options:\n");
printf(" -X do not add any ICMP/TCP header (transport layer)\n");
printf(" -1 fuzz ICMP6 echo request (default)\n");
printf(" -2 fuzz ICMP6 neighbor solicitation\n");
printf(" -3 fuzz ICMP6 neighbor advertisement\n");
printf(" -4 fuzz ICMP6 router advertisement\n");
printf(" -5 fuzz multicast listener report packet\n");
printf(" -6 fuzz multicast listener done packet\n");
printf(" -7 fuzz multicast listener query packet\n");
printf(" -8 fuzz multicast listener v2 report packet\n");
printf(" -9 fuzz multicast listener v2 query packet\n");
printf(" -0 fuzz node query packet\n");
printf(" -s port fuzz TCP-SYN packet against port\n");
printf(" -P type fuzz PIMv2 type packet (hello, bootstrap, assert)\n");
printf(" -x tries all 256 values for flag and byte types\n");
printf(" -t number continue from test no. number\n");
printf(" -T number only performs test no. number\n");
printf(
" -p number perform an alive check every number of tests (default: "
"none)\n");
printf(" -a do not perform initial and final alive test\n");
printf(" -n number how many times to send each packet (default: 1)\n");
printf(" -I fuzz the IP header too\n");
printf(" -F add one-shot fragmentation, and fuzz it too (for 1)\n");
printf(" -S add source-routing, and fuzz it too (for 1)\n");
printf(" -D add destination header, and fuzz it too (for 1)\n");
printf(
" -H add hop-by-hop header, and fuzz it too (for 1 and 5-9)\n");
printf(
" -R add router alert header, and fuzz it too (for 5-9 and "
"all)\n");
printf(" -J add jumbo packet header, and fuzz it too (for 1)\n");
// printf("Use -r to use raw mode.\n");
printf("You can only define one of -0 ... -9, -P and -s, defaults to -1.\n");
printf("Note that the -P fuzzing target should be ff02::d\n");
printf(
"Returns -1 on error, 0 on tests done and targt alive or 1 on target "
"crash.\n");
exit(-1);
}
void addfuzz(char **fuzzbuf, int *fuzzbuf_sz, char *fuzztype) {
if (strlen(*fuzzbuf) + strlen(fuzztype) + 1 > *fuzzbuf_sz) {
*fuzzbuf_sz *= 2;
*fuzzbuf = realloc(*fuzzbuf, *fuzzbuf_sz);
}
strcat(*fuzzbuf, fuzztype);
}
void ignoreit(u_char *foo, const struct pcap_pkthdr *header,
const unsigned char *data) {
return;
}
int check_alive(pcap_t *p, char *interface, unsigned char *srcmac,
unsigned char *dstmac, unsigned char *src, unsigned char *dst) {
int ret = -2;
time_t t;
while (thc_pcap_check(p, (char *)ignoreit, NULL) > 0)
;
thc_ping26(interface, srcmac, dstmac, src, dst, 16, 1);
t = time(NULL);
while (ret < 0) {
if (thc_pcap_check(p, (char *)ignoreit, NULL) > 0) ret = 1;
if (time(NULL) > t + 1 && ret == -2) {
thc_ping26(interface, srcmac, dstmac, src, dst, 16, 1);
ret = -1;
}
if (time(NULL) > t + 4 && ret < 0) ret = 0;
}
return ret > 0 ? 1 : 0;
}
int main(int argc, char *argv[]) {
unsigned char *pkt = NULL, *pkt_bak, *mcast6, *someaddr6 = NULL;
unsigned char *dst6, *src6 = NULL, *mac = NULL, *routers[2],
string[64] = "ip6 and dst ";
int test_start = 0, fragment = 0, alert = 0, sroute = 0;
int do_type = DO_PING, do_alive = 1, hopbyhop = 0, destination = 0, jumbo = 0;
int pkt_len = 0, offset = 0, test_current = 0, i, j, k, do_fuzz = 1,
test_ptr = 0;
int test_end = TEST_MAX, ping = NEVER, frag_offset = 0, header = 0,
no_send = 1;
int test_pos = 0, test_cnt = 0, do_it, extend = 0, mtu = 1500, size = 64,
wait = 0, off2 = 14, fuzzbuf_sz = 256;
char *interface, *fuzzbuf, *srcmac, *dns, *route6, *real_dst6 = NULL,
*tmp6 = NULL;
unsigned char buf[256], buf2[100], buf3[16];
unsigned short int *sip;
pcap_t * p;
thc_ipv6_hdr * hdr;
if (argc < 3 || strncmp(argv[1], "-h", 2) == 0) help(argv[0]);
while ((i = getopt(argc, argv, "s:0123456789Xxt:T:p:FSDHRIJan:P:")) >= 0) {
switch (i) {
case 's':
do_type = DO_TCP;
port = atoi(optarg);
break;
case '0':
do_type = DO_NODEQUERY;
break;
case '1':
do_type = DO_PING;
break;
case '2':
do_type = DO_NEIGHSOL;
break;
case '3':
do_type = DO_NEIGHADV;
break;
case '4':
do_type = DO_RA;
break;
case '5':
do_type = DO_MLD_REP;
break;
case '6':
do_type = DO_MLD_DONE;
break;
case '7':
do_type = DO_MLD_QUERY;
wait = 0xff0000;
break;
case '8':
do_type = DO_MLD2_REPORT;
break;
case '9':
do_type = DO_MLD2_QUERY;
wait = 0xff0000;
break;
case 'P':
if (strncmp(optarg, "hel", 3) == 0)
do_type = DO_PIM_HELLO;
else if (strncmp(optarg, "ass", 3) == 0)
do_type = DO_PIM_ASSERT;
else if (strncmp(optarg, "boot", 4) == 0)
do_type = DO_PIM_BOOTSTRAP;
else {
fprintf(stderr, "Error: PIM message type %s is not implemented yet\n",
optarg);
exit(-1);
}
break;
case 'X':
do_type = DO_NONE;
break;
case 't':
test_start = atoi(optarg);
break;
case 'T':
test_end = test_start = atoi(optarg);
break;
case 'p':
ping = atoi(optarg);
break;
case 'a':
do_alive = 0;
break;
case 'S':
sroute = 1;
break;
case 'n':
no_send = atoi(optarg);
break;
case 'F':
fragment = 1;
break;
case 'R':
alert = 1;
break;
case 'D':
destination = 1;
break;
case 'H':
hopbyhop = 1;
break;
case 'J':
jumbo = 1;
break;
case 'I':
header = 1;
break;
case 'x':
extend = 1;
break;
}
}
if (argc - optind < 2) {
fprintf(stderr,
"ERROR: not enough options, interface and target address are "
"required!\n");
exit(-1);
}
interface = argv[optind];
if ((srcmac = thc_get_own_mac(interface)) == NULL) {
fprintf(
stderr,
"ERROR: %s is not a valid interface which has a MAC, use raw mode?\n",
interface);
exit(-1);
}
if (no_send < 1) {
fprintf(stderr, "ERROR: -n number must be between one and 2 billion\n");
exit(-1);
}
if (do_hdr_size) {
test_pos -= do_hdr_size;
offset -= do_hdr_size;
off2 = do_hdr_size;
}
if (do_type != DO_PING && do_type != DO_TCP && do_type != DO_NONE) {
if ((mcast6 = thc_resolve6(argv[optind + 1])) == NULL) {
fprintf(stderr, "Error: %s does not resolve to a valid IPv6 address\n",
argv[optind + 1]);
exit(-1);
}
if (do_type == DO_NEIGHSOL) {
dst6 = thc_resolve6("ff02::0001:ff00:0000");
memcpy(dst6 + 13, mcast6 + 13, 3);
} else
dst6 = thc_resolve6("ff02::1");
if (do_type >= DO_PIM_HELLO && do_type <= DO_PIM_ASSERT)
dst6 = thc_resolve6("ff02::d");
} else {
dst6 = thc_resolve6(argv[optind + 1]);
}
if (argv[optind + 1] != NULL)
if ((real_dst6 = thc_resolve6(argv[optind + 1])) == NULL) {
fprintf(stderr, "Error: %s does not resolve to a valid IPv6 address\n",
argv[optind + 1]);
exit(-1);
}
if (interface == NULL || argv[optind + 1] == NULL) {
printf(
"Error: interface and target-ipv6-address are mandatory command line "
"options\n");
exit(-1);
}
if (ping < 1 || test_end < test_start) {
printf("don't fuck up the command line options!\n");
exit(-1);
}
if (argv[optind + 2] != NULL) someaddr6 = thc_resolve6(argv[optind + 2]);
if (argc - optind > 3) {
printf("Error: too many command line options\n");
exit(-1);
}
if ((mac = thc_get_mac(interface, src6, dst6)) == NULL) {
fprintf(stderr, "ERROR: Can not resolve mac address for %s\n", argv[2]);
exit(-1);
}
if (do_type == DO_PING || do_type == DO_TCP || do_type == DO_NONE)
src6 = thc_get_own_ipv6(interface, dst6, PREFER_GLOBAL);
else
src6 = thc_get_own_ipv6(interface, dst6, PREFER_LINK);
if (src6 == NULL) {
fprintf(stderr, "Error: no IPv6 address configured on interface %s\n",
interface);
exit(-1);
}
strcat(string, thc_ipv62notation(src6));
if (sroute) {
if (someaddr6 != NULL)
routers[0] = someaddr6;
else
routers[0] = dst6;
routers[1] = NULL;
}
setvbuf(stdout, NULL, _IONBF, 0);
memset(buf, 0, sizeof(buf));
memset(buf2, 0, sizeof(buf2));
dns = thc_resolve6("ff02::fb");
route6 = thc_resolve6("2a01::");
if ((p = thc_pcap_init(interface, string)) == NULL) {
fprintf(stderr, "Error: could not capture on interface %s with string %s\n",
interface, string);
exit(-1);
}
if (real_dst6 != NULL && (unsigned char)real_dst6[0] == 0xff) do_alive = 0;
// ping before to check if it works
if (do_alive)
if (check_alive(p, interface, srcmac, mac, src6, real_dst6) == 0) {
fprintf(stderr, "Error: target %s is not alive via direct ping6!\n",
argv[optind + 1]);
exit(-1);
}
// generate basic packet
fuzzbuf = malloc(fuzzbuf_sz);
fuzzbuf[0] = '\0';
addfuzz(&fuzzbuf, &fuzzbuf_sz, fuzztype_ether);
if ((pkt = thc_create_ipv6_extended(interface, PREFER_GLOBAL, &pkt_len, src6,
dst6, 0, 0, 0, 0, 0)) == NULL)
return -1;
if (header)
addfuzz(&fuzzbuf, &fuzzbuf_sz, fuzztype_ip6);
else
addfuzz(&fuzzbuf, &fuzzbuf_sz, fuzztype_ip6no);
if (alert || hopbyhop || jumbo) {
memset(buf2, 0, sizeof(buf2));
i = 0;
addfuzz(&fuzzbuf, &fuzzbuf_sz, "XX"); // first two bytes of EH
if (alert) {
buf2[i++] = 5;
buf2[i++] = 2;
i += 2;
addfuzz(&fuzzbuf, &fuzzbuf_sz, ".FW");
}
if (jumbo) {
buf2[i++] = 0xc2;
buf2[i++] = 4;
buf2[i++] = 'J'; // lookup code
buf2[i++] = 'J';
buf2[i++] = 'J';
buf2[i++] = 'J';
addfuzz(&fuzzbuf, &fuzzbuf_sz, ".FWW");
}
if (hopbyhop) {
memset(buf3, 0, sizeof(buf3));
buf3[0] = 'X';
buf3[1] = '.';
for (j = 0; j < 10; j++) {
buf2[i++] = 1; // PadN, length
buf2[i++] = j;
if (j > 0) {
memset(buf2 + i, 0xaa, j);
buf3[2 + j] = '.';
i += j;
}
// always: X..... for every new option
addfuzz(&fuzzbuf, &fuzzbuf_sz, buf3);
}
}
j = 8 - ((i + 2) % 8);
if (j > 0 && j < 8) {
for (k = 0; k < j; k++)
addfuzz(&fuzzbuf, &fuzzbuf_sz, "."); // fill because of padding
}
if (thc_add_hdr_hopbyhop(pkt, &pkt_len, buf2, i) < 0) return -1;
i += 2;
if (i % 8 > 0) i = ((i / 8) + 1) * 8;
offset += i;
}
if (sroute) {
if (thc_add_hdr_route(pkt, &pkt_len, routers, 1) < 0)
return -1;
else {
addfuzz(&fuzzbuf, &fuzzbuf_sz, "FFFFBBBB................");
offset += 24;
}
}
if (fragment) {
frag_offset = offset;
if (thc_add_hdr_fragment(pkt, &pkt_len, 0, 0, 0) < 0)
return -1;
else {
addfuzz(&fuzzbuf, &fuzzbuf_sz, "FFWW..");
offset += 8;
}
}
if (destination) {
memset(buf2, 0, sizeof(buf2));
memset(buf3, 0, sizeof(buf3));
addfuzz(&fuzzbuf, &fuzzbuf_sz, "XX"); // first two bytes of EH
buf3[0] = 'X';
buf3[1] = '.';
i = 0;
for (j = 0; j < 10; j++) {
buf2[i++] = 1; // PadN, length
buf2[i++] = j;
if (j > 0) {
memset(buf2 + i, 0xaa, j);
buf3[2 + j] = '.';
i += j;
}
// always: X... for every new option
addfuzz(&fuzzbuf, &fuzzbuf_sz, buf3);
}
j = 8 - ((i + 2) % 8);
if (j > 0 && j < 8) {
for (k = 0; k < j; k++)
addfuzz(&fuzzbuf, &fuzzbuf_sz, "."); // fill because of padding
}
if (thc_add_hdr_dst(pkt, &pkt_len, buf2, i) < 0) return -1;
i += 2;
if (i % 8 > 0) i = ((i / 8) + 1) * 8;
offset += i;
}
memset(buf, 0, sizeof(buf));
// if (header)
addfuzz(&fuzzbuf, &fuzzbuf_sz, fuzztype_icmp6);
// else
// addfuzz(&fuzzbuf, &fuzzbuf_sz, fuzztype_icmp6no);
switch (do_type) {
case DO_TCP:
// tcp options
buf[0] = 2; // max segment size
buf[1] = 4;
buf[2] = 255;
buf[3] = 255;
buf[4] = 3; // windows size
buf[5] = 3;
buf[6] = 62;
buf[7] = 1; // padding
buf[8] = 8; // timestamp
buf[9] = 10;
buf[10] = time(NULL) / 16777216;
buf[11] = ((time(NULL) / 65536) % 256);
buf[12] = ((time(NULL) / 256) % 256);
buf[13] = time(NULL) % 256;
// 4 bytes ack tstamp 00000000
// rest is padding (2 bytes)
if (thc_add_tcp(pkt, &pkt_len, 65532, port, test_current, 0, TCP_SYN,
5760, 0, (unsigned char *)buf, 20, (unsigned char *)buf,
20) < 0)
return -1;
addfuzz(&fuzzbuf, &fuzzbuf_sz, fuzztype_tcp);
break;
case DO_PING:
if (thc_add_icmp6(pkt, &pkt_len, ICMP6_PINGREQUEST, 0, test_current,
(unsigned char *)&buf, 16, 0) < 0)
return -1;
addfuzz(&fuzzbuf, &fuzzbuf_sz, fuzztype_icmp6ping);
break;
case DO_PIM_HELLO:
buf[1] = 1; // opt 1
buf[3] = 2; // len 2
buf[5] = 255;
buf[7] = 19; // opt 19
buf[9] = 4; // len 4
buf[13] = 2;
buf[15] = 20; // opt 20
buf[17] = 4; // len 4
// buf 18, 4 bytes: rand counter
i = time(NULL);
memcpy(buf + 18, (char *)&i + _TAKE4, 4);
buf[23] = 2; // opt 2
buf[25] = 4; // len 4
memset(buf + 26, 0x01, 4);
buf[31] = 24; // opt 24
buf[33] = 18; // len 18
buf[34] = 2;
if (someaddr6 == NULL)
tmp6 = thc_get_own_ipv6(interface, dst6, PREFER_GLOBAL);
else
tmp6 = someaddr6;
memcpy(buf + 36, tmp6, 16);
if (thc_add_pim(pkt, &pkt_len, do_type, buf, 52) < 0) return -1;
addfuzz(&fuzzbuf, &fuzzbuf_sz, fuzztype_pim_hello);
break;
case DO_PIM_BOOTSTRAP:
buf[0] = 5;
buf[1] = 0x7d;
buf[3] = 1;
buf[4] = 2;
if (someaddr6 == NULL)
tmp6 = thc_get_own_ipv6(interface, dst6, PREFER_GLOBAL);
else
tmp6 = someaddr6;
memcpy(buf + 6, tmp6, 16);
buf[22] = 2;
buf[25] = 40; // mask
tmp6 = thc_resolve6("ff00::");
memcpy(buf + 26, tmp6, 16); // buf + 27 <= rand
buf[42] = 1;
buf[43] = 1;
buf[46] = 2;
tmp6 = thc_get_own_ipv6(interface, dst6, PREFER_GLOBAL);
memcpy(buf + 48, tmp6, 16);
buf[65] = 0x96; // holdtime
buf[66] = 7; // prio
if (someaddr6 == NULL)
tmp6 = thc_get_own_ipv6(interface, dst6, PREFER_GLOBAL);
else
tmp6 = someaddr6;
memcpy(buf + 36, tmp6, 16);
if (thc_add_pim(pkt, &pkt_len, do_type, buf, 68) < 0) return -1;
addfuzz(&fuzzbuf, &fuzzbuf_sz, fuzztype_pim_bootstrap);
break;
case DO_PIM_ASSERT:
buf[0] = 2;
buf[3] = 16;
if (someaddr6 != NULL && someaddr6[0] == 0xff)
tmp6 = someaddr6;
else
tmp6 = thc_resolve6("ff05::3");
memcpy(buf + 4, tmp6, 16);
buf[20] = 2;
buf[32 + 6] = 0x80;
buf[34 + 6] = 1; // metric 256
buf[38 + 6] = 1;
if (thc_add_pim(pkt, &pkt_len, do_type, buf, 46) < 0) return -1;
addfuzz(&fuzzbuf, &fuzzbuf_sz, fuzztype_pim_assert);
break;
case DO_NONE:
// empty
break;
case DO_NEIGHSOL:
if (someaddr6 != NULL)
memcpy(buf, someaddr6, 16);
else
memcpy(buf, mcast6, 16);
buf[16] = 1;
buf[17] = 1;
memcpy(buf + 18, srcmac, 6);
if (thc_add_icmp6(pkt, &pkt_len, ICMP6_NEIGHBORSOL, 0, 0,
(unsigned char *)&buf, 24, 0) < 0)
return -1;
addfuzz(&fuzzbuf, &fuzzbuf_sz, fuzztype_icmp6ns);
break;
case DO_NEIGHADV:
if (someaddr6 != NULL)
memcpy(buf, someaddr6, 16);
else
memcpy(buf, src6, 16);
buf[16] = 2;
buf[17] = 1;
memcpy(buf + 18, srcmac, 6);
if (thc_add_icmp6(pkt, &pkt_len, ICMP6_NEIGHBORADV, 0, 0xe0000000,
(unsigned char *)&buf, 24, 0) < 0)
return -1;
addfuzz(&fuzzbuf, &fuzzbuf_sz, fuzztype_icmp6na);
break;
case DO_NODEQUERY:
memcpy(buf + 8, real_dst6, 16);
if (thc_add_icmp6(pkt, &pkt_len, ICMP6_NODEQUERY, 0, 0x0003003e,
(unsigned char *)&buf, 24, 0) < 0)
return -1;
addfuzz(&fuzzbuf, &fuzzbuf_sz, fuzztype_icmp6nq);
break;
case DO_RA:
// buf[3] = 250; // 0-3: reachable timer
buf[6] = 4; // 4-7: retrans timer
// option mtu
buf[8] = 5;
buf[9] = 1;
buf[12] = mtu / 16777216;
buf[14] = (mtu % 65536) / 256;
buf[15] = mtu % 256;
// option prefix
buf[16] = 3;
buf[17] = 4;
buf[18] = size; // prefix length
buf[19] = 128 + 64;
memset(&buf[20], 17, 4);
memset(&buf[24], 4, 4);
if (someaddr6 != NULL)
memcpy(&buf[32], someaddr6, 16);
else
memcpy(&buf[32], route6, 16);
i = 48;
// mac address option
buf[i++] = 1;
buf[i++] = 1;
memcpy(buf + i, srcmac, 6);
i += 6; // = 8 == 56
// default route routing option
buf[i++] = 0x18; // routing entry option type
buf[i++] = 0x03; // length 3 == 24 bytes
buf[i++] = 64; // prefix length /64
buf[i++] = 0x08; // priority, highest of course
i += 2; // 52-53 unknown
buf[i++] = 0x11; // lifetime, word
buf[i++] = 0x11; // lifetime, word
buf[i++] = 0x20;
buf[i++] = 4; // 56-71 address, 2004:: for default
i += 14; // = 24 == 70
// dns option
buf[i++] = 0x19; // dns option type
buf[i++] = 0x03; // length
i += 2; // 74-75 reserved
memset(buf + i, 1, 4); // validity time
i += 4;
if (someaddr6 != NULL)
memcpy(buf + i, someaddr6, 16); // dns server
else
memcpy(buf + i, dns, 16); // dns server
i += 16; // = 24 == 94
// seachlist option
buf[i++] = 31;
buf[i++] = 4;
i += 2;
memset(buf + i, 1, 4); // validity time
i += 4;
buf[i++] = 3;
memcpy(buf + i, "foo", 3);
i += 3;
buf[i++] = 4;
memcpy(buf + i, "corp", 4);
i += 5; // + null byte
buf[i++] = 5;
memcpy(buf + i, "local", 5);
i += 5;
buf[i++] = 6;
memcpy(buf + i, "domain", 6);
i += 7; // + null byte
// = 32 == 126
// flag extension option
buf[i++] = 26;
buf[i++] = 1;
buf[i++] = 0x08;
i += 5;
if (thc_add_icmp6(pkt, &pkt_len, ICMP6_ROUTERADV, 0, 0xff080800, buf, i,
0) < 0)
return -1;
addfuzz(&fuzzbuf, &fuzzbuf_sz, fuzztype_icmp6ra);
break;
case DO_MLD_QUERY:
case DO_MLD_DONE:
case DO_MLD_REP:
buf[0] = 0xff;
buf[1] = 0x02;
buf[15] = 0x05;
if (someaddr6 != NULL) memcpy(buf, someaddr6, 16);
if (thc_add_icmp6(pkt, &pkt_len, do_type, 0, wait, buf, 16, 0) < 0)
return -1;
addfuzz(&fuzzbuf, &fuzzbuf_sz, fuzztype_icmp6mld);
break;
case DO_MLD2_QUERY:
buf[0] = 0xff;
buf[1] = 0x02;
buf[15] = 0x05;
if (someaddr6 != NULL) memcpy(buf, someaddr6, 16);
buf[16] = 7;
buf[17] = 120;
buf[19] = 3;
memcpy(buf + 20, dst6, 16);
memcpy(buf + 36, buf, 16);
if (thc_add_icmp6(pkt, &pkt_len, DO_MLD_QUERY, 0, wait, buf, 68, 0) < 0)
return -1;
addfuzz(&fuzzbuf, &fuzzbuf_sz, fuzztype_icmp6mld2que);
break;
case DO_MLD2_REPORT:
for (i = 0; i < 3; i++) {
buf[0 + 68 * i] =
1 + i * 2 - i / 2; // include new++, generates 1, 3 and 4
buf[3 + 68 * i] = 3; // 3 sources
buf[4 + 68 * i] = 0xff;
buf[5 + 68 * i] = 0x02;
buf[18 + 68 * i] = 0x82 + i % 256;
buf[19 + 68 * i] = 0xff;
memcpy(buf + 20 + 68 * i, src6, 16);
buf[36 + 68 * i] = 0xfe;
buf[37 + 68 * i] = 0x80;
buf[46 + 68 * i] = 0xf0;
if (someaddr6 != NULL) memcpy(buf + 52 + 68 * i, someaddr6, 16);
}
if (thc_add_icmp6(pkt, &pkt_len, do_type, 0, 3, buf, 208, 0) < 0)
return -1;
addfuzz(&fuzzbuf, &fuzzbuf_sz, fuzztype_icmp6mld2rep);
break;
default:
fprintf(stderr, "ERROR: Mode not implemented yet!\n");
exit(-1);
}
if (thc_generate_pkt(interface, srcmac, mac, pkt, &pkt_len) < 0) return -1;
hdr = (thc_ipv6_hdr *)pkt;
if (jumbo) {
i = 0;
j = 1;
while (i < hdr->pkt_len + 4 && j) {
if (hdr->pkt[i] == 'J')
if (memcmp(&hdr->pkt[i], "JJJJ", 4) == 0) j = 0;
i++;
}
if (j) {
fprintf(stderr, "ERROR: fuckup, cant find my own marker?!\n");
exit(-1);
} else
i--;
hdr->pkt[i] = 0;
hdr->pkt[i + 1] = 0;
hdr->pkt[i + 2] = hdr->pkt[4 + off2];
hdr->pkt[i + 3] = hdr->pkt[5 + off2];
hdr->pkt[4 + off2] = 0;
hdr->pkt[5 + off2] = 0;
}
if (extend)
for (i = 0; i < strlen(fuzzbuf); i++)
if (fuzzbuf[i] == 'B' || fuzzbuf[i] == 'F') fuzzbuf[i] = 'X';
// backup of generated packet
pkt_bak = malloc(hdr->pkt_len);
memcpy(pkt_bak, hdr->pkt, hdr->pkt_len);
printf(
"Fuzzing packet, starting at fuzz case %d, ending at fuzz case %d, every "
"packet sent denoted by a dot:\n",
test_start, test_end);
// printf("buf(%d): %s\n", strlen(fuzzbuf), fuzzbuf);
while (do_fuzz) {
if (test_cnt == 0)
while (fuzzbuf[test_ptr] == '.') {
test_ptr++;
test_pos++;
}
if (fuzzbuf[test_ptr] == 0) do_fuzz = 0;
test_cnt++;
do_it = 1;
// printf("[%s] pos[%d]=%c -> %d | pkt[%d] | %d (%d=>%d)| ", /*fuzzbuf*/"",
// test_ptr, fuzzbuf[test_ptr], test_cnt, test_pos, test_current, test_start,
// test_end);
switch (fuzzbuf[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_BYTE && 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] + _TAKE2, 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;
default:
fprintf(stderr,
"This character should not be in the fuzz string, shoot the "
"programmer: %c(%d) position %d string %s\n",