dropbear: fuzz/fuzz-sshpacketmutator.c annotate

annotate fuzz/fuzz-sshpacketmutator.c @ 1861:2b3a8026a6ce

Add re-exec for server This allows ASLR to re-randomize the address space for every connection, preventing some vulnerabilities from being exploitable by repeated probing. Overhead (memory and time) is yet to be confirmed. At present this is only enabled on Linux. Other BSD platforms with fexecve() would probably also work though have not been tested.

author	Matt Johnston <matt@ucc.asn.au>
date	Sun, 30 Jan 2022 10:14:56 +0800
parents	8179eabe16c9
children

rev	line source
1771 af9ed0815818 Use SSH packet mutator for preauth too Matt Johnston <matt@ucc.asn.au> parents: 1767 diff changeset	1 /* A mutator/crossover for SSH protocol streams.
af9ed0815818 Use SSH packet mutator for preauth too Matt Johnston <matt@ucc.asn.au> parents: 1767 diff changeset	2 Attempts to mutate each SSH packet individually, keeping
af9ed0815818 Use SSH packet mutator for preauth too Matt Johnston <matt@ucc.asn.au> parents: 1767 diff changeset	3 lengths intact.
af9ed0815818 Use SSH packet mutator for preauth too Matt Johnston <matt@ucc.asn.au> parents: 1767 diff changeset	4 It will prepend a SSH-2.0-dbfuzz\r\n version string.
af9ed0815818 Use SSH packet mutator for preauth too Matt Johnston <matt@ucc.asn.au> parents: 1767 diff changeset	5
af9ed0815818 Use SSH packet mutator for preauth too Matt Johnston <matt@ucc.asn.au> parents: 1767 diff changeset	6 Linking this file to a binary will make libfuzzer pick up the custom mutator.
af9ed0815818 Use SSH packet mutator for preauth too Matt Johnston <matt@ucc.asn.au> parents: 1767 diff changeset	7
af9ed0815818 Use SSH packet mutator for preauth too Matt Johnston <matt@ucc.asn.au> parents: 1767 diff changeset	8 Care is taken to avoid memory allocation which would otherwise
af9ed0815818 Use SSH packet mutator for preauth too Matt Johnston <matt@ucc.asn.au> parents: 1767 diff changeset	9 slow exec/s substantially */
af9ed0815818 Use SSH packet mutator for preauth too Matt Johnston <matt@ucc.asn.au> parents: 1767 diff changeset	10
1760 2406a9987810 Add first try at fuzzing custom mutator Matt Johnston <matt@ucc.asn.au> parents: diff changeset	11 #include "fuzz.h"
1765 b688c884dad7 Fix fuzz-sshpacketmutator to work Matt Johnston <matt@ucc.asn.au> parents: 1760 diff changeset	12 #include "dbutil.h"
1760 2406a9987810 Add first try at fuzzing custom mutator Matt Johnston <matt@ucc.asn.au> parents: diff changeset	13
2406a9987810 Add first try at fuzzing custom mutator Matt Johnston <matt@ucc.asn.au> parents: diff changeset	14 size_t LLVMFuzzerMutate(uint8_t *Data, size_t Size, size_t MaxSize);
2406a9987810 Add first try at fuzzing custom mutator Matt Johnston <matt@ucc.asn.au> parents: diff changeset	15
1771 af9ed0815818 Use SSH packet mutator for preauth too Matt Johnston <matt@ucc.asn.au> parents: 1767 diff changeset	16 static const char* FIXED_VERSION = "SSH-2.0-dbfuzz\r\n";
1774 833bf9947603 Fuzzing - get rid of "prefix" for streams Matt Johnston <matt@ucc.asn.au> parents: 1771 diff changeset	17 static const char* FIXED_IGNORE_MSG =
833bf9947603 Fuzzing - get rid of "prefix" for streams Matt Johnston <matt@ucc.asn.au> parents: 1771 diff changeset	18 "\x00\x00\x00\x10\x06\x02\x00\x00\x00\x00\x11\x22\x33\x44\x55\x66";
833bf9947603 Fuzzing - get rid of "prefix" for streams Matt Johnston <matt@ucc.asn.au> parents: 1771 diff changeset	19 static const unsigned int FIXED_IGNORE_MSG_LEN = 16;
833bf9947603 Fuzzing - get rid of "prefix" for streams Matt Johnston <matt@ucc.asn.au> parents: 1771 diff changeset	20 #define MAX_FUZZ_PACKETS 500
1771 af9ed0815818 Use SSH packet mutator for preauth too Matt Johnston <matt@ucc.asn.au> parents: 1767 diff changeset	21 /* XXX This might need tuning */
af9ed0815818 Use SSH packet mutator for preauth too Matt Johnston <matt@ucc.asn.au> parents: 1767 diff changeset	22 static const size_t MAX_OUT_SIZE = 50000;
af9ed0815818 Use SSH packet mutator for preauth too Matt Johnston <matt@ucc.asn.au> parents: 1767 diff changeset	23
af9ed0815818 Use SSH packet mutator for preauth too Matt Johnston <matt@ucc.asn.au> parents: 1767 diff changeset	24 /* Splits packets from an input stream buffer "inp".
af9ed0815818 Use SSH packet mutator for preauth too Matt Johnston <matt@ucc.asn.au> parents: 1767 diff changeset	25 The initial SSH version identifier is discarded.
af9ed0815818 Use SSH packet mutator for preauth too Matt Johnston <matt@ucc.asn.au> parents: 1767 diff changeset	26 If packets are not recognised it will increment until an uint32 of valid
af9ed0815818 Use SSH packet mutator for preauth too Matt Johnston <matt@ucc.asn.au> parents: 1767 diff changeset	27 packet length is found. */
af9ed0815818 Use SSH packet mutator for preauth too Matt Johnston <matt@ucc.asn.au> parents: 1767 diff changeset	28
1767 3e1e1f82eba6 Preallocate memory for sshpacketmutator. Add fuzzer-client_mutator_nomaths Matt Johnston <matt@ucc.asn.au> parents: 1766 diff changeset	29 /* out_packets an array of num_out_packetsbuffer, each of size RECV_MAX_PACKET_LEN /
1760 2406a9987810 Add first try at fuzzing custom mutator Matt Johnston <matt@ucc.asn.au> parents: diff changeset	30 static void fuzz_get_packets(buffer inp, buffer out_packets, unsigned int num_out_packets) {
2406a9987810 Add first try at fuzzing custom mutator Matt Johnston <matt@ucc.asn.au> parents: diff changeset	31 /* Skip any existing banner. Format is
2406a9987810 Add first try at fuzzing custom mutator Matt Johnston <matt@ucc.asn.au> parents: diff changeset	32 SSH-protoversion-softwareversion SP comments CR LF
2406a9987810 Add first try at fuzzing custom mutator Matt Johnston <matt@ucc.asn.au> parents: diff changeset	33 so we look for SSH-2. then a subsequent LF */
2406a9987810 Add first try at fuzzing custom mutator Matt Johnston <matt@ucc.asn.au> parents: diff changeset	34 unsigned char* version = memmem(inp->data, inp->len, "SSH-2.", strlen("SSH-2."));
2406a9987810 Add first try at fuzzing custom mutator Matt Johnston <matt@ucc.asn.au> parents: diff changeset	35 if (version) {
2406a9987810 Add first try at fuzzing custom mutator Matt Johnston <matt@ucc.asn.au> parents: diff changeset	36 buf_incrpos(inp, version - inp->data);
2406a9987810 Add first try at fuzzing custom mutator Matt Johnston <matt@ucc.asn.au> parents: diff changeset	37 unsigned char* newline = memchr(&inp->data[inp->pos], '\n', inp->len - inp->pos);
2406a9987810 Add first try at fuzzing custom mutator Matt Johnston <matt@ucc.asn.au> parents: diff changeset	38 if (newline) {
1765 b688c884dad7 Fix fuzz-sshpacketmutator to work Matt Johnston <matt@ucc.asn.au> parents: 1760 diff changeset	39 buf_incrpos(inp, newline - &inp->data[inp->pos]+1);
1760 2406a9987810 Add first try at fuzzing custom mutator Matt Johnston <matt@ucc.asn.au> parents: diff changeset	40 } else {
2406a9987810 Add first try at fuzzing custom mutator Matt Johnston <matt@ucc.asn.au> parents: diff changeset	41 /* Give up on any version string */
2406a9987810 Add first try at fuzzing custom mutator Matt Johnston <matt@ucc.asn.au> parents: diff changeset	42 buf_setpos(inp, 0);
2406a9987810 Add first try at fuzzing custom mutator Matt Johnston <matt@ucc.asn.au> parents: diff changeset	43 }
2406a9987810 Add first try at fuzzing custom mutator Matt Johnston <matt@ucc.asn.au> parents: diff changeset	44 }
2406a9987810 Add first try at fuzzing custom mutator Matt Johnston <matt@ucc.asn.au> parents: diff changeset	45
2406a9987810 Add first try at fuzzing custom mutator Matt Johnston <matt@ucc.asn.au> parents: diff changeset	46 const unsigned int max_out_packets = *num_out_packets;
2406a9987810 Add first try at fuzzing custom mutator Matt Johnston <matt@ucc.asn.au> parents: diff changeset	47 *num_out_packets = 0;
2406a9987810 Add first try at fuzzing custom mutator Matt Johnston <matt@ucc.asn.au> parents: diff changeset	48 while (1) {
2406a9987810 Add first try at fuzzing custom mutator Matt Johnston <matt@ucc.asn.au> parents: diff changeset	49 if (inp->pos + 4 > inp->len) {
2406a9987810 Add first try at fuzzing custom mutator Matt Johnston <matt@ucc.asn.au> parents: diff changeset	50 /* End of input */
2406a9987810 Add first try at fuzzing custom mutator Matt Johnston <matt@ucc.asn.au> parents: diff changeset	51 break;
2406a9987810 Add first try at fuzzing custom mutator Matt Johnston <matt@ucc.asn.au> parents: diff changeset	52 }
2406a9987810 Add first try at fuzzing custom mutator Matt Johnston <matt@ucc.asn.au> parents: diff changeset	53
2406a9987810 Add first try at fuzzing custom mutator Matt Johnston <matt@ucc.asn.au> parents: diff changeset	54 if (*num_out_packets >= max_out_packets) {
2406a9987810 Add first try at fuzzing custom mutator Matt Johnston <matt@ucc.asn.au> parents: diff changeset	55 /* End of output */
2406a9987810 Add first try at fuzzing custom mutator Matt Johnston <matt@ucc.asn.au> parents: diff changeset	56 break;
2406a9987810 Add first try at fuzzing custom mutator Matt Johnston <matt@ucc.asn.au> parents: diff changeset	57 }
2406a9987810 Add first try at fuzzing custom mutator Matt Johnston <matt@ucc.asn.au> parents: diff changeset	58
2406a9987810 Add first try at fuzzing custom mutator Matt Johnston <matt@ucc.asn.au> parents: diff changeset	59 /* Read packet */
2406a9987810 Add first try at fuzzing custom mutator Matt Johnston <matt@ucc.asn.au> parents: diff changeset	60 unsigned int packet_len = buf_getint(inp);
1765 b688c884dad7 Fix fuzz-sshpacketmutator to work Matt Johnston <matt@ucc.asn.au> parents: 1760 diff changeset	61 if (packet_len > RECV_MAX_PACKET_LEN-4) {
1760 2406a9987810 Add first try at fuzzing custom mutator Matt Johnston <matt@ucc.asn.au> parents: diff changeset	62 /* Bad length, try skipping a single byte */
2406a9987810 Add first try at fuzzing custom mutator Matt Johnston <matt@ucc.asn.au> parents: diff changeset	63 buf_decrpos(inp, 3);
2406a9987810 Add first try at fuzzing custom mutator Matt Johnston <matt@ucc.asn.au> parents: diff changeset	64 continue;
2406a9987810 Add first try at fuzzing custom mutator Matt Johnston <matt@ucc.asn.au> parents: diff changeset	65 }
2406a9987810 Add first try at fuzzing custom mutator Matt Johnston <matt@ucc.asn.au> parents: diff changeset	66 packet_len = MIN(packet_len, inp->len - inp->pos);
2406a9987810 Add first try at fuzzing custom mutator Matt Johnston <matt@ucc.asn.au> parents: diff changeset	67
1774 833bf9947603 Fuzzing - get rid of "prefix" for streams Matt Johnston <matt@ucc.asn.au> parents: 1771 diff changeset	68 /* Check the packet length makes sense */
833bf9947603 Fuzzing - get rid of "prefix" for streams Matt Johnston <matt@ucc.asn.au> parents: 1771 diff changeset	69 if (packet_len >= MIN_PACKET_LEN-4) {
833bf9947603 Fuzzing - get rid of "prefix" for streams Matt Johnston <matt@ucc.asn.au> parents: 1771 diff changeset	70 /* Copy to output buffer. We're reusing buffers */
833bf9947603 Fuzzing - get rid of "prefix" for streams Matt Johnston <matt@ucc.asn.au> parents: 1771 diff changeset	71 buffer* new_packet = out_packets[*num_out_packets];
833bf9947603 Fuzzing - get rid of "prefix" for streams Matt Johnston <matt@ucc.asn.au> parents: 1771 diff changeset	72 (*num_out_packets)++;
833bf9947603 Fuzzing - get rid of "prefix" for streams Matt Johnston <matt@ucc.asn.au> parents: 1771 diff changeset	73 buf_setlen(new_packet, 0);
833bf9947603 Fuzzing - get rid of "prefix" for streams Matt Johnston <matt@ucc.asn.au> parents: 1771 diff changeset	74 // packet_len doesn't include itself
833bf9947603 Fuzzing - get rid of "prefix" for streams Matt Johnston <matt@ucc.asn.au> parents: 1771 diff changeset	75 buf_putint(new_packet, packet_len);
833bf9947603 Fuzzing - get rid of "prefix" for streams Matt Johnston <matt@ucc.asn.au> parents: 1771 diff changeset	76 buf_putbytes(new_packet, buf_getptr(inp, packet_len), packet_len);
833bf9947603 Fuzzing - get rid of "prefix" for streams Matt Johnston <matt@ucc.asn.au> parents: 1771 diff changeset	77 }
1760 2406a9987810 Add first try at fuzzing custom mutator Matt Johnston <matt@ucc.asn.au> parents: diff changeset	78 buf_incrpos(inp, packet_len);
2406a9987810 Add first try at fuzzing custom mutator Matt Johnston <matt@ucc.asn.au> parents: diff changeset	79 }
2406a9987810 Add first try at fuzzing custom mutator Matt Johnston <matt@ucc.asn.au> parents: diff changeset	80 }
2406a9987810 Add first try at fuzzing custom mutator Matt Johnston <matt@ucc.asn.au> parents: diff changeset	81
1774 833bf9947603 Fuzzing - get rid of "prefix" for streams Matt Johnston <matt@ucc.asn.au> parents: 1771 diff changeset	82 /* Mutate a packet buffer in-place.
833bf9947603 Fuzzing - get rid of "prefix" for streams Matt Johnston <matt@ucc.asn.au> parents: 1771 diff changeset	83 Returns DROPBEAR_FAILURE if it's too short */
833bf9947603 Fuzzing - get rid of "prefix" for streams Matt Johnston <matt@ucc.asn.au> parents: 1771 diff changeset	84 static int buf_llvm_mutate(buffer *buf) {
833bf9947603 Fuzzing - get rid of "prefix" for streams Matt Johnston <matt@ucc.asn.au> parents: 1771 diff changeset	85 int ret;
1760 2406a9987810 Add first try at fuzzing custom mutator Matt Johnston <matt@ucc.asn.au> parents: diff changeset	86 /* Position it after packet_length and padding_length */
2406a9987810 Add first try at fuzzing custom mutator Matt Johnston <matt@ucc.asn.au> parents: diff changeset	87 const unsigned int offset = 5;
1774 833bf9947603 Fuzzing - get rid of "prefix" for streams Matt Johnston <matt@ucc.asn.au> parents: 1771 diff changeset	88 buf_setpos(buf, 0);
833bf9947603 Fuzzing - get rid of "prefix" for streams Matt Johnston <matt@ucc.asn.au> parents: 1771 diff changeset	89 buf_incrwritepos(buf, offset);
1760 2406a9987810 Add first try at fuzzing custom mutator Matt Johnston <matt@ucc.asn.au> parents: diff changeset	90 size_t max_size = buf->size - buf->pos;
2406a9987810 Add first try at fuzzing custom mutator Matt Johnston <matt@ucc.asn.au> parents: diff changeset	91 size_t new_size = LLVMFuzzerMutate(buf_getwriteptr(buf, max_size),
2406a9987810 Add first try at fuzzing custom mutator Matt Johnston <matt@ucc.asn.au> parents: diff changeset	92 buf->len - buf->pos, max_size);
1774 833bf9947603 Fuzzing - get rid of "prefix" for streams Matt Johnston <matt@ucc.asn.au> parents: 1771 diff changeset	93 size_t new_total = new_size + 1 + 4;
833bf9947603 Fuzzing - get rid of "prefix" for streams Matt Johnston <matt@ucc.asn.au> parents: 1771 diff changeset	94 // Round down to a block size
833bf9947603 Fuzzing - get rid of "prefix" for streams Matt Johnston <matt@ucc.asn.au> parents: 1771 diff changeset	95 new_total = new_total - (new_total % dropbear_nocipher.blocksize);
833bf9947603 Fuzzing - get rid of "prefix" for streams Matt Johnston <matt@ucc.asn.au> parents: 1771 diff changeset	96
833bf9947603 Fuzzing - get rid of "prefix" for streams Matt Johnston <matt@ucc.asn.au> parents: 1771 diff changeset	97 if (new_total >= 16) {
833bf9947603 Fuzzing - get rid of "prefix" for streams Matt Johnston <matt@ucc.asn.au> parents: 1771 diff changeset	98 buf_setlen(buf, new_total);
833bf9947603 Fuzzing - get rid of "prefix" for streams Matt Johnston <matt@ucc.asn.au> parents: 1771 diff changeset	99 // Fix up the length fields
833bf9947603 Fuzzing - get rid of "prefix" for streams Matt Johnston <matt@ucc.asn.au> parents: 1771 diff changeset	100 buf_setpos(buf, 0);
833bf9947603 Fuzzing - get rid of "prefix" for streams Matt Johnston <matt@ucc.asn.au> parents: 1771 diff changeset	101 // packet_length doesn't include itself, does include padding_length byte
833bf9947603 Fuzzing - get rid of "prefix" for streams Matt Johnston <matt@ucc.asn.au> parents: 1771 diff changeset	102 buf_putint(buf, new_size+1);
833bf9947603 Fuzzing - get rid of "prefix" for streams Matt Johnston <matt@ucc.asn.au> parents: 1771 diff changeset	103 // always just put minimum padding length = 4
833bf9947603 Fuzzing - get rid of "prefix" for streams Matt Johnston <matt@ucc.asn.au> parents: 1771 diff changeset	104 buf_putbyte(buf, 4);
833bf9947603 Fuzzing - get rid of "prefix" for streams Matt Johnston <matt@ucc.asn.au> parents: 1771 diff changeset	105 ret = DROPBEAR_SUCCESS;
833bf9947603 Fuzzing - get rid of "prefix" for streams Matt Johnston <matt@ucc.asn.au> parents: 1771 diff changeset	106 } else {
833bf9947603 Fuzzing - get rid of "prefix" for streams Matt Johnston <matt@ucc.asn.au> parents: 1771 diff changeset	107 // instead put a fake packet
833bf9947603 Fuzzing - get rid of "prefix" for streams Matt Johnston <matt@ucc.asn.au> parents: 1771 diff changeset	108 buf_setlen(buf, 0);
833bf9947603 Fuzzing - get rid of "prefix" for streams Matt Johnston <matt@ucc.asn.au> parents: 1771 diff changeset	109 buf_putbytes(buf, FIXED_IGNORE_MSG, FIXED_IGNORE_MSG_LEN);
833bf9947603 Fuzzing - get rid of "prefix" for streams Matt Johnston <matt@ucc.asn.au> parents: 1771 diff changeset	110 ret = DROPBEAR_FAILURE;
833bf9947603 Fuzzing - get rid of "prefix" for streams Matt Johnston <matt@ucc.asn.au> parents: 1771 diff changeset	111 }
833bf9947603 Fuzzing - get rid of "prefix" for streams Matt Johnston <matt@ucc.asn.au> parents: 1771 diff changeset	112 return ret;
1760 2406a9987810 Add first try at fuzzing custom mutator Matt Johnston <matt@ucc.asn.au> parents: diff changeset	113 }
2406a9987810 Add first try at fuzzing custom mutator Matt Johnston <matt@ucc.asn.au> parents: diff changeset	114
2406a9987810 Add first try at fuzzing custom mutator Matt Johnston <matt@ucc.asn.au> parents: diff changeset	115
1767 3e1e1f82eba6 Preallocate memory for sshpacketmutator. Add fuzzer-client_mutator_nomaths Matt Johnston <matt@ucc.asn.au> parents: 1766 diff changeset	116 /* Persistent buffers to avoid constant allocations */
3e1e1f82eba6 Preallocate memory for sshpacketmutator. Add fuzzer-client_mutator_nomaths Matt Johnston <matt@ucc.asn.au> parents: 1766 diff changeset	117 static buffer *oup;
3e1e1f82eba6 Preallocate memory for sshpacketmutator. Add fuzzer-client_mutator_nomaths Matt Johnston <matt@ucc.asn.au> parents: 1766 diff changeset	118 static buffer *alloc_packetA;
3e1e1f82eba6 Preallocate memory for sshpacketmutator. Add fuzzer-client_mutator_nomaths Matt Johnston <matt@ucc.asn.au> parents: 1766 diff changeset	119 static buffer *alloc_packetB;
1774 833bf9947603 Fuzzing - get rid of "prefix" for streams Matt Johnston <matt@ucc.asn.au> parents: 1771 diff changeset	120 static buffer* packets1[MAX_FUZZ_PACKETS];
833bf9947603 Fuzzing - get rid of "prefix" for streams Matt Johnston <matt@ucc.asn.au> parents: 1771 diff changeset	121 static buffer* packets2[MAX_FUZZ_PACKETS];
1767 3e1e1f82eba6 Preallocate memory for sshpacketmutator. Add fuzzer-client_mutator_nomaths Matt Johnston <matt@ucc.asn.au> parents: 1766 diff changeset	122
3e1e1f82eba6 Preallocate memory for sshpacketmutator. Add fuzzer-client_mutator_nomaths Matt Johnston <matt@ucc.asn.au> parents: 1766 diff changeset	123 /* Allocate buffers once at startup.
3e1e1f82eba6 Preallocate memory for sshpacketmutator. Add fuzzer-client_mutator_nomaths Matt Johnston <matt@ucc.asn.au> parents: 1766 diff changeset	124 'constructor' here so it runs before dbmalloc's interceptor */
3e1e1f82eba6 Preallocate memory for sshpacketmutator. Add fuzzer-client_mutator_nomaths Matt Johnston <matt@ucc.asn.au> parents: 1766 diff changeset	125 static void alloc_static_buffers() __attribute__((constructor));
3e1e1f82eba6 Preallocate memory for sshpacketmutator. Add fuzzer-client_mutator_nomaths Matt Johnston <matt@ucc.asn.au> parents: 1766 diff changeset	126 static void alloc_static_buffers() {
3e1e1f82eba6 Preallocate memory for sshpacketmutator. Add fuzzer-client_mutator_nomaths Matt Johnston <matt@ucc.asn.au> parents: 1766 diff changeset	127
3e1e1f82eba6 Preallocate memory for sshpacketmutator. Add fuzzer-client_mutator_nomaths Matt Johnston <matt@ucc.asn.au> parents: 1766 diff changeset	128 int i;
3e1e1f82eba6 Preallocate memory for sshpacketmutator. Add fuzzer-client_mutator_nomaths Matt Johnston <matt@ucc.asn.au> parents: 1766 diff changeset	129 oup = buf_new(MAX_OUT_SIZE);
3e1e1f82eba6 Preallocate memory for sshpacketmutator. Add fuzzer-client_mutator_nomaths Matt Johnston <matt@ucc.asn.au> parents: 1766 diff changeset	130 alloc_packetA = buf_new(RECV_MAX_PACKET_LEN);
3e1e1f82eba6 Preallocate memory for sshpacketmutator. Add fuzzer-client_mutator_nomaths Matt Johnston <matt@ucc.asn.au> parents: 1766 diff changeset	131 alloc_packetB = buf_new(RECV_MAX_PACKET_LEN);
3e1e1f82eba6 Preallocate memory for sshpacketmutator. Add fuzzer-client_mutator_nomaths Matt Johnston <matt@ucc.asn.au> parents: 1766 diff changeset	132
3e1e1f82eba6 Preallocate memory for sshpacketmutator. Add fuzzer-client_mutator_nomaths Matt Johnston <matt@ucc.asn.au> parents: 1766 diff changeset	133 for (i = 0; i < MAX_FUZZ_PACKETS; i++) {
3e1e1f82eba6 Preallocate memory for sshpacketmutator. Add fuzzer-client_mutator_nomaths Matt Johnston <matt@ucc.asn.au> parents: 1766 diff changeset	134 packets1[i] = buf_new(RECV_MAX_PACKET_LEN);
3e1e1f82eba6 Preallocate memory for sshpacketmutator. Add fuzzer-client_mutator_nomaths Matt Johnston <matt@ucc.asn.au> parents: 1766 diff changeset	135 }
3e1e1f82eba6 Preallocate memory for sshpacketmutator. Add fuzzer-client_mutator_nomaths Matt Johnston <matt@ucc.asn.au> parents: 1766 diff changeset	136 for (i = 0; i < MAX_FUZZ_PACKETS; i++) {
3e1e1f82eba6 Preallocate memory for sshpacketmutator. Add fuzzer-client_mutator_nomaths Matt Johnston <matt@ucc.asn.au> parents: 1766 diff changeset	137 packets2[i] = buf_new(RECV_MAX_PACKET_LEN);
3e1e1f82eba6 Preallocate memory for sshpacketmutator. Add fuzzer-client_mutator_nomaths Matt Johnston <matt@ucc.asn.au> parents: 1766 diff changeset	138 }
3e1e1f82eba6 Preallocate memory for sshpacketmutator. Add fuzzer-client_mutator_nomaths Matt Johnston <matt@ucc.asn.au> parents: 1766 diff changeset	139 }
3e1e1f82eba6 Preallocate memory for sshpacketmutator. Add fuzzer-client_mutator_nomaths Matt Johnston <matt@ucc.asn.au> parents: 1766 diff changeset	140
1760 2406a9987810 Add first try at fuzzing custom mutator Matt Johnston <matt@ucc.asn.au> parents: diff changeset	141 size_t LLVMFuzzerCustomMutator(uint8_t *Data, size_t Size,
2406a9987810 Add first try at fuzzing custom mutator Matt Johnston <matt@ucc.asn.au> parents: diff changeset	142 size_t MaxSize, unsigned int Seed) {
1765 b688c884dad7 Fix fuzz-sshpacketmutator to work Matt Johnston <matt@ucc.asn.au> parents: 1760 diff changeset	143
1767 3e1e1f82eba6 Preallocate memory for sshpacketmutator. Add fuzzer-client_mutator_nomaths Matt Johnston <matt@ucc.asn.au> parents: 1766 diff changeset	144 buf_setlen(alloc_packetA, 0);
3e1e1f82eba6 Preallocate memory for sshpacketmutator. Add fuzzer-client_mutator_nomaths Matt Johnston <matt@ucc.asn.au> parents: 1766 diff changeset	145 buf_setlen(alloc_packetB, 0);
3e1e1f82eba6 Preallocate memory for sshpacketmutator. Add fuzzer-client_mutator_nomaths Matt Johnston <matt@ucc.asn.au> parents: 1766 diff changeset	146 buf_setlen(oup, 0);
1765 b688c884dad7 Fix fuzz-sshpacketmutator to work Matt Johnston <matt@ucc.asn.au> parents: 1760 diff changeset	147
b688c884dad7 Fix fuzz-sshpacketmutator to work Matt Johnston <matt@ucc.asn.au> parents: 1760 diff changeset	148 unsigned int i;
1774 833bf9947603 Fuzzing - get rid of "prefix" for streams Matt Johnston <matt@ucc.asn.au> parents: 1771 diff changeset	149 size_t ret_len;
1760 2406a9987810 Add first try at fuzzing custom mutator Matt Johnston <matt@ucc.asn.au> parents: diff changeset	150 unsigned short randstate[3] = {0,0,0};
2406a9987810 Add first try at fuzzing custom mutator Matt Johnston <matt@ucc.asn.au> parents: diff changeset	151 memcpy(randstate, &Seed, sizeof(Seed));
2406a9987810 Add first try at fuzzing custom mutator Matt Johnston <matt@ucc.asn.au> parents: diff changeset	152
1765 b688c884dad7 Fix fuzz-sshpacketmutator to work Matt Johnston <matt@ucc.asn.au> parents: 1760 diff changeset	153 // printhex("mutator input", Data, Size);
1771 af9ed0815818 Use SSH packet mutator for preauth too Matt Johnston <matt@ucc.asn.au> parents: 1767 diff changeset	154
af9ed0815818 Use SSH packet mutator for preauth too Matt Johnston <matt@ucc.asn.au> parents: 1767 diff changeset	155 /* 0.1% chance straight llvm mutate */
1774 833bf9947603 Fuzzing - get rid of "prefix" for streams Matt Johnston <matt@ucc.asn.au> parents: 1771 diff changeset	156 // if (nrand48(randstate) % 1000 == 0) {
833bf9947603 Fuzzing - get rid of "prefix" for streams Matt Johnston <matt@ucc.asn.au> parents: 1771 diff changeset	157 // ret_len = LLVMFuzzerMutate(Data, Size, MaxSize);
833bf9947603 Fuzzing - get rid of "prefix" for streams Matt Johnston <matt@ucc.asn.au> parents: 1771 diff changeset	158 // // printhex("mutator straight llvm", Data, ret_len);
833bf9947603 Fuzzing - get rid of "prefix" for streams Matt Johnston <matt@ucc.asn.au> parents: 1771 diff changeset	159 // return ret_len;
833bf9947603 Fuzzing - get rid of "prefix" for streams Matt Johnston <matt@ucc.asn.au> parents: 1771 diff changeset	160 // }
1760 2406a9987810 Add first try at fuzzing custom mutator Matt Johnston <matt@ucc.asn.au> parents: diff changeset	161
2406a9987810 Add first try at fuzzing custom mutator Matt Johnston <matt@ucc.asn.au> parents: diff changeset	162 buffer inp_buf = {.data = Data, .size = Size, .len = Size, .pos = 0};
2406a9987810 Add first try at fuzzing custom mutator Matt Johnston <matt@ucc.asn.au> parents: diff changeset	163 buffer *inp = &inp_buf;
2406a9987810 Add first try at fuzzing custom mutator Matt Johnston <matt@ucc.asn.au> parents: diff changeset	164
2406a9987810 Add first try at fuzzing custom mutator Matt Johnston <matt@ucc.asn.au> parents: diff changeset	165 /* Parse packets */
2406a9987810 Add first try at fuzzing custom mutator Matt Johnston <matt@ucc.asn.au> parents: diff changeset	166 unsigned int num_packets = MAX_FUZZ_PACKETS;
1767 3e1e1f82eba6 Preallocate memory for sshpacketmutator. Add fuzzer-client_mutator_nomaths Matt Johnston <matt@ucc.asn.au> parents: 1766 diff changeset	167 buffer **packets = packets1;
1760 2406a9987810 Add first try at fuzzing custom mutator Matt Johnston <matt@ucc.asn.au> parents: diff changeset	168 fuzz_get_packets(inp, packets, &num_packets);
2406a9987810 Add first try at fuzzing custom mutator Matt Johnston <matt@ucc.asn.au> parents: diff changeset	169
2406a9987810 Add first try at fuzzing custom mutator Matt Johnston <matt@ucc.asn.au> parents: diff changeset	170 if (num_packets == 0) {
1774 833bf9947603 Fuzzing - get rid of "prefix" for streams Matt Johnston <matt@ucc.asn.au> parents: 1771 diff changeset	171 // Make up a packet, writing direct to the buffer
833bf9947603 Fuzzing - get rid of "prefix" for streams Matt Johnston <matt@ucc.asn.au> parents: 1771 diff changeset	172 inp->size = MaxSize;
833bf9947603 Fuzzing - get rid of "prefix" for streams Matt Johnston <matt@ucc.asn.au> parents: 1771 diff changeset	173 buf_setlen(inp, 0);
833bf9947603 Fuzzing - get rid of "prefix" for streams Matt Johnston <matt@ucc.asn.au> parents: 1771 diff changeset	174 buf_putbytes(inp, FIXED_VERSION, strlen(FIXED_VERSION));
833bf9947603 Fuzzing - get rid of "prefix" for streams Matt Johnston <matt@ucc.asn.au> parents: 1771 diff changeset	175 buf_putbytes(inp, FIXED_IGNORE_MSG, FIXED_IGNORE_MSG_LEN);
833bf9947603 Fuzzing - get rid of "prefix" for streams Matt Johnston <matt@ucc.asn.au> parents: 1771 diff changeset	176 // printhex("mutator no input", Data, inp->len);
833bf9947603 Fuzzing - get rid of "prefix" for streams Matt Johnston <matt@ucc.asn.au> parents: 1771 diff changeset	177 return inp->len;
1760 2406a9987810 Add first try at fuzzing custom mutator Matt Johnston <matt@ucc.asn.au> parents: diff changeset	178 }
2406a9987810 Add first try at fuzzing custom mutator Matt Johnston <matt@ucc.asn.au> parents: diff changeset	179
2406a9987810 Add first try at fuzzing custom mutator Matt Johnston <matt@ucc.asn.au> parents: diff changeset	180 /* Start output */
2406a9987810 Add first try at fuzzing custom mutator Matt Johnston <matt@ucc.asn.au> parents: diff changeset	181 /* Put a new banner to output */
2406a9987810 Add first try at fuzzing custom mutator Matt Johnston <matt@ucc.asn.au> parents: diff changeset	182 buf_putbytes(oup, FIXED_VERSION, strlen(FIXED_VERSION));
2406a9987810 Add first try at fuzzing custom mutator Matt Johnston <matt@ucc.asn.au> parents: diff changeset	183
2406a9987810 Add first try at fuzzing custom mutator Matt Johnston <matt@ucc.asn.au> parents: diff changeset	184 /* Iterate output */
2406a9987810 Add first try at fuzzing custom mutator Matt Johnston <matt@ucc.asn.au> parents: diff changeset	185 for (i = 0; i < num_packets+1; i++) {
2406a9987810 Add first try at fuzzing custom mutator Matt Johnston <matt@ucc.asn.au> parents: diff changeset	186 // These are pointers to output
2406a9987810 Add first try at fuzzing custom mutator Matt Johnston <matt@ucc.asn.au> parents: diff changeset	187 buffer out_packetA = NULL, out_packetB = NULL;
1767 3e1e1f82eba6 Preallocate memory for sshpacketmutator. Add fuzzer-client_mutator_nomaths Matt Johnston <matt@ucc.asn.au> parents: 1766 diff changeset	188 buf_setlen(alloc_packetA, 0);
3e1e1f82eba6 Preallocate memory for sshpacketmutator. Add fuzzer-client_mutator_nomaths Matt Johnston <matt@ucc.asn.au> parents: 1766 diff changeset	189 buf_setlen(alloc_packetB, 0);
1760 2406a9987810 Add first try at fuzzing custom mutator Matt Johnston <matt@ucc.asn.au> parents: diff changeset	190
1774 833bf9947603 Fuzzing - get rid of "prefix" for streams Matt Johnston <matt@ucc.asn.au> parents: 1771 diff changeset	191 /* 2% chance each */
833bf9947603 Fuzzing - get rid of "prefix" for streams Matt Johnston <matt@ucc.asn.au> parents: 1771 diff changeset	192 const int optA = nrand48(randstate) % 50;
1760 2406a9987810 Add first try at fuzzing custom mutator Matt Johnston <matt@ucc.asn.au> parents: diff changeset	193 if (optA == 0) {
2406a9987810 Add first try at fuzzing custom mutator Matt Johnston <matt@ucc.asn.au> parents: diff changeset	194 /* Copy another */
1765 b688c884dad7 Fix fuzz-sshpacketmutator to work Matt Johnston <matt@ucc.asn.au> parents: 1760 diff changeset	195 unsigned int other = nrand48(randstate) % num_packets;
b688c884dad7 Fix fuzz-sshpacketmutator to work Matt Johnston <matt@ucc.asn.au> parents: 1760 diff changeset	196 out_packetA = packets[other];
1774 833bf9947603 Fuzzing - get rid of "prefix" for streams Matt Johnston <matt@ucc.asn.au> parents: 1771 diff changeset	197 // printf("copy another %d / %d len %u\n", other, num_packets, out_packetA->len);
1760 2406a9987810 Add first try at fuzzing custom mutator Matt Johnston <matt@ucc.asn.au> parents: diff changeset	198 }
2406a9987810 Add first try at fuzzing custom mutator Matt Johnston <matt@ucc.asn.au> parents: diff changeset	199 if (optA == 1) {
2406a9987810 Add first try at fuzzing custom mutator Matt Johnston <matt@ucc.asn.au> parents: diff changeset	200 /* Mutate another */
1765 b688c884dad7 Fix fuzz-sshpacketmutator to work Matt Johnston <matt@ucc.asn.au> parents: 1760 diff changeset	201 unsigned int other = nrand48(randstate) % num_packets;
1774 833bf9947603 Fuzzing - get rid of "prefix" for streams Matt Johnston <matt@ucc.asn.au> parents: 1771 diff changeset	202 out_packetA = alloc_packetA;
1765 b688c884dad7 Fix fuzz-sshpacketmutator to work Matt Johnston <matt@ucc.asn.au> parents: 1760 diff changeset	203 buffer *from = packets[other];
1774 833bf9947603 Fuzzing - get rid of "prefix" for streams Matt Johnston <matt@ucc.asn.au> parents: 1771 diff changeset	204 buf_putbytes(out_packetA, from->data, from->len);
833bf9947603 Fuzzing - get rid of "prefix" for streams Matt Johnston <matt@ucc.asn.au> parents: 1771 diff changeset	205 if (buf_llvm_mutate(out_packetA) == DROPBEAR_FAILURE) {
833bf9947603 Fuzzing - get rid of "prefix" for streams Matt Johnston <matt@ucc.asn.au> parents: 1771 diff changeset	206 out_packetA = NULL;
833bf9947603 Fuzzing - get rid of "prefix" for streams Matt Johnston <matt@ucc.asn.au> parents: 1771 diff changeset	207 }
833bf9947603 Fuzzing - get rid of "prefix" for streams Matt Johnston <matt@ucc.asn.au> parents: 1771 diff changeset	208 // printf("mutate another %d / %d len %u -> %u\n", other, num_packets, from->len, out_packetA->len);
1760 2406a9987810 Add first try at fuzzing custom mutator Matt Johnston <matt@ucc.asn.au> parents: diff changeset	209 }
2406a9987810 Add first try at fuzzing custom mutator Matt Johnston <matt@ucc.asn.au> parents: diff changeset	210
2406a9987810 Add first try at fuzzing custom mutator Matt Johnston <matt@ucc.asn.au> parents: diff changeset	211 if (i < num_packets) {
1774 833bf9947603 Fuzzing - get rid of "prefix" for streams Matt Johnston <matt@ucc.asn.au> parents: 1771 diff changeset	212 int optB = nrand48(randstate) % 100;
1760 2406a9987810 Add first try at fuzzing custom mutator Matt Johnston <matt@ucc.asn.au> parents: diff changeset	213 if (optB == 1) {
1774 833bf9947603 Fuzzing - get rid of "prefix" for streams Matt Johnston <matt@ucc.asn.au> parents: 1771 diff changeset	214 /* small chance of drop */
1760 2406a9987810 Add first try at fuzzing custom mutator Matt Johnston <matt@ucc.asn.au> parents: diff changeset	215 /* Drop it */
1774 833bf9947603 Fuzzing - get rid of "prefix" for streams Matt Johnston <matt@ucc.asn.au> parents: 1771 diff changeset	216 //printf("%d drop\n", i);
833bf9947603 Fuzzing - get rid of "prefix" for streams Matt Johnston <matt@ucc.asn.au> parents: 1771 diff changeset	217 } else {
833bf9947603 Fuzzing - get rid of "prefix" for streams Matt Johnston <matt@ucc.asn.au> parents: 1771 diff changeset	218 /* Odds of modification are proportional to packet position.
833bf9947603 Fuzzing - get rid of "prefix" for streams Matt Johnston <matt@ucc.asn.au> parents: 1771 diff changeset	219 First packet has 20% chance, last has 100% chance */
833bf9947603 Fuzzing - get rid of "prefix" for streams Matt Johnston <matt@ucc.asn.au> parents: 1771 diff changeset	220 int optC = nrand48(randstate) % 1000;
833bf9947603 Fuzzing - get rid of "prefix" for streams Matt Johnston <matt@ucc.asn.au> parents: 1771 diff changeset	221 int mutate_cutoff = MAX(200, (1000 * (i+1) / num_packets));
833bf9947603 Fuzzing - get rid of "prefix" for streams Matt Johnston <matt@ucc.asn.au> parents: 1771 diff changeset	222 if (optC < mutate_cutoff) {
833bf9947603 Fuzzing - get rid of "prefix" for streams Matt Johnston <matt@ucc.asn.au> parents: 1771 diff changeset	223 // // printf("%d mutate\n", i);
833bf9947603 Fuzzing - get rid of "prefix" for streams Matt Johnston <matt@ucc.asn.au> parents: 1771 diff changeset	224 out_packetB = alloc_packetB;
833bf9947603 Fuzzing - get rid of "prefix" for streams Matt Johnston <matt@ucc.asn.au> parents: 1771 diff changeset	225 buffer *from = packets[i];
833bf9947603 Fuzzing - get rid of "prefix" for streams Matt Johnston <matt@ucc.asn.au> parents: 1771 diff changeset	226 buf_putbytes(out_packetB, from->data, from->len);
833bf9947603 Fuzzing - get rid of "prefix" for streams Matt Johnston <matt@ucc.asn.au> parents: 1771 diff changeset	227 if (buf_llvm_mutate(out_packetB) == DROPBEAR_FAILURE) {
833bf9947603 Fuzzing - get rid of "prefix" for streams Matt Johnston <matt@ucc.asn.au> parents: 1771 diff changeset	228 out_packetB = from;
833bf9947603 Fuzzing - get rid of "prefix" for streams Matt Johnston <matt@ucc.asn.au> parents: 1771 diff changeset	229 }
833bf9947603 Fuzzing - get rid of "prefix" for streams Matt Johnston <matt@ucc.asn.au> parents: 1771 diff changeset	230 // printf("mutate self %d / %d len %u -> %u\n", i, num_packets, from->len, out_packetB->len);
833bf9947603 Fuzzing - get rid of "prefix" for streams Matt Johnston <matt@ucc.asn.au> parents: 1771 diff changeset	231 } else {
833bf9947603 Fuzzing - get rid of "prefix" for streams Matt Johnston <matt@ucc.asn.au> parents: 1771 diff changeset	232 /* Copy as-is */
833bf9947603 Fuzzing - get rid of "prefix" for streams Matt Johnston <matt@ucc.asn.au> parents: 1771 diff changeset	233 out_packetB = packets[i];
833bf9947603 Fuzzing - get rid of "prefix" for streams Matt Johnston <matt@ucc.asn.au> parents: 1771 diff changeset	234 // printf("%d as-is len %u\n", i, out_packetB->len);
833bf9947603 Fuzzing - get rid of "prefix" for streams Matt Johnston <matt@ucc.asn.au> parents: 1771 diff changeset	235 }
833bf9947603 Fuzzing - get rid of "prefix" for streams Matt Johnston <matt@ucc.asn.au> parents: 1771 diff changeset	236 }
1760 2406a9987810 Add first try at fuzzing custom mutator Matt Johnston <matt@ucc.asn.au> parents: diff changeset	237 }
2406a9987810 Add first try at fuzzing custom mutator Matt Johnston <matt@ucc.asn.au> parents: diff changeset	238
2406a9987810 Add first try at fuzzing custom mutator Matt Johnston <matt@ucc.asn.au> parents: diff changeset	239 if (out_packetA && oup->len + out_packetA->len <= oup->size) {
2406a9987810 Add first try at fuzzing custom mutator Matt Johnston <matt@ucc.asn.au> parents: diff changeset	240 buf_putbytes(oup, out_packetA->data, out_packetA->len);
2406a9987810 Add first try at fuzzing custom mutator Matt Johnston <matt@ucc.asn.au> parents: diff changeset	241 }
2406a9987810 Add first try at fuzzing custom mutator Matt Johnston <matt@ucc.asn.au> parents: diff changeset	242 if (out_packetB && oup->len + out_packetB->len <= oup->size) {
2406a9987810 Add first try at fuzzing custom mutator Matt Johnston <matt@ucc.asn.au> parents: diff changeset	243 buf_putbytes(oup, out_packetB->data, out_packetB->len);
2406a9987810 Add first try at fuzzing custom mutator Matt Johnston <matt@ucc.asn.au> parents: diff changeset	244 }
2406a9987810 Add first try at fuzzing custom mutator Matt Johnston <matt@ucc.asn.au> parents: diff changeset	245 }
2406a9987810 Add first try at fuzzing custom mutator Matt Johnston <matt@ucc.asn.au> parents: diff changeset	246
1774 833bf9947603 Fuzzing - get rid of "prefix" for streams Matt Johnston <matt@ucc.asn.au> parents: 1771 diff changeset	247 ret_len = MIN(MaxSize, oup->len);
1760 2406a9987810 Add first try at fuzzing custom mutator Matt Johnston <matt@ucc.asn.au> parents: diff changeset	248 memcpy(Data, oup->data, ret_len);
1765 b688c884dad7 Fix fuzz-sshpacketmutator to work Matt Johnston <matt@ucc.asn.au> parents: 1760 diff changeset	249 // printhex("mutator done", Data, ret_len);
1760 2406a9987810 Add first try at fuzzing custom mutator Matt Johnston <matt@ucc.asn.au> parents: diff changeset	250 return ret_len;
2406a9987810 Add first try at fuzzing custom mutator Matt Johnston <matt@ucc.asn.au> parents: diff changeset	251 }
2406a9987810 Add first try at fuzzing custom mutator Matt Johnston <matt@ucc.asn.au> parents: diff changeset	252
1766 b14e0a19bcbe crossover works Matt Johnston <matt@ucc.asn.au> parents: 1765 diff changeset	253 size_t LLVMFuzzerCustomCrossOver(const uint8_t *Data1, size_t Size1,
b14e0a19bcbe crossover works Matt Johnston <matt@ucc.asn.au> parents: 1765 diff changeset	254 const uint8_t *Data2, size_t Size2,
b14e0a19bcbe crossover works Matt Johnston <matt@ucc.asn.au> parents: 1765 diff changeset	255 uint8_t *Out, size_t MaxOutSize,
b14e0a19bcbe crossover works Matt Johnston <matt@ucc.asn.au> parents: 1765 diff changeset	256 unsigned int Seed) {
b14e0a19bcbe crossover works Matt Johnston <matt@ucc.asn.au> parents: 1765 diff changeset	257 unsigned short randstate[3] = {0,0,0};
b14e0a19bcbe crossover works Matt Johnston <matt@ucc.asn.au> parents: 1765 diff changeset	258 memcpy(randstate, &Seed, sizeof(Seed));
1765 b688c884dad7 Fix fuzz-sshpacketmutator to work Matt Johnston <matt@ucc.asn.au> parents: 1760 diff changeset	259
1766 b14e0a19bcbe crossover works Matt Johnston <matt@ucc.asn.au> parents: 1765 diff changeset	260 unsigned int i;
b14e0a19bcbe crossover works Matt Johnston <matt@ucc.asn.au> parents: 1765 diff changeset	261 buffer inp_buf1 = {.data = (void*)Data1, .size = Size1, .len = Size1, .pos = 0};
b14e0a19bcbe crossover works Matt Johnston <matt@ucc.asn.au> parents: 1765 diff changeset	262 buffer *inp1 = &inp_buf1;
b14e0a19bcbe crossover works Matt Johnston <matt@ucc.asn.au> parents: 1765 diff changeset	263 buffer inp_buf2 = {.data = (void*)Data2, .size = Size2, .len = Size2, .pos = 0};
b14e0a19bcbe crossover works Matt Johnston <matt@ucc.asn.au> parents: 1765 diff changeset	264 buffer *inp2 = &inp_buf2;
b14e0a19bcbe crossover works Matt Johnston <matt@ucc.asn.au> parents: 1765 diff changeset	265
b14e0a19bcbe crossover works Matt Johnston <matt@ucc.asn.au> parents: 1765 diff changeset	266 unsigned int num_packets1 = MAX_FUZZ_PACKETS;
b14e0a19bcbe crossover works Matt Johnston <matt@ucc.asn.au> parents: 1765 diff changeset	267 fuzz_get_packets(inp1, packets1, &num_packets1);
b14e0a19bcbe crossover works Matt Johnston <matt@ucc.asn.au> parents: 1765 diff changeset	268 unsigned int num_packets2 = MAX_FUZZ_PACKETS;
b14e0a19bcbe crossover works Matt Johnston <matt@ucc.asn.au> parents: 1765 diff changeset	269 fuzz_get_packets(inp2, packets2, &num_packets2);
b14e0a19bcbe crossover works Matt Johnston <matt@ucc.asn.au> parents: 1765 diff changeset	270
1774 833bf9947603 Fuzzing - get rid of "prefix" for streams Matt Johnston <matt@ucc.asn.au> parents: 1771 diff changeset	271 // fprintf(stderr, "input 1 %u packets\n", num_packets1);
833bf9947603 Fuzzing - get rid of "prefix" for streams Matt Johnston <matt@ucc.asn.au> parents: 1771 diff changeset	272 // printhex("crossover input1", Data1, Size1);
833bf9947603 Fuzzing - get rid of "prefix" for streams Matt Johnston <matt@ucc.asn.au> parents: 1771 diff changeset	273 // fprintf(stderr, "input 2 %u packets\n", num_packets2);
833bf9947603 Fuzzing - get rid of "prefix" for streams Matt Johnston <matt@ucc.asn.au> parents: 1771 diff changeset	274 // printhex("crossover input2", Data2, Size2);
833bf9947603 Fuzzing - get rid of "prefix" for streams Matt Johnston <matt@ucc.asn.au> parents: 1771 diff changeset	275
1767 3e1e1f82eba6 Preallocate memory for sshpacketmutator. Add fuzzer-client_mutator_nomaths Matt Johnston <matt@ucc.asn.au> parents: 1766 diff changeset	276 buf_setlen(oup, 0);
1766 b14e0a19bcbe crossover works Matt Johnston <matt@ucc.asn.au> parents: 1765 diff changeset	277 /* Put a new banner to output */
b14e0a19bcbe crossover works Matt Johnston <matt@ucc.asn.au> parents: 1765 diff changeset	278 buf_putbytes(oup, FIXED_VERSION, strlen(FIXED_VERSION));
b14e0a19bcbe crossover works Matt Johnston <matt@ucc.asn.au> parents: 1765 diff changeset	279
1774 833bf9947603 Fuzzing - get rid of "prefix" for streams Matt Johnston <matt@ucc.asn.au> parents: 1771 diff changeset	280 if (num_packets1 == 0 && num_packets2 == 0) {
833bf9947603 Fuzzing - get rid of "prefix" for streams Matt Johnston <matt@ucc.asn.au> parents: 1771 diff changeset	281 buf_putbytes(oup, FIXED_IGNORE_MSG, FIXED_IGNORE_MSG_LEN);
833bf9947603 Fuzzing - get rid of "prefix" for streams Matt Johnston <matt@ucc.asn.au> parents: 1771 diff changeset	282 } else {
833bf9947603 Fuzzing - get rid of "prefix" for streams Matt Johnston <matt@ucc.asn.au> parents: 1771 diff changeset	283 unsigned int min_out = MIN(num_packets1, num_packets2);
833bf9947603 Fuzzing - get rid of "prefix" for streams Matt Johnston <matt@ucc.asn.au> parents: 1771 diff changeset	284 unsigned int max_out = num_packets1 + num_packets2;
833bf9947603 Fuzzing - get rid of "prefix" for streams Matt Johnston <matt@ucc.asn.au> parents: 1771 diff changeset	285 unsigned int num_out = min_out + nrand48(randstate) % (max_out-min_out+1);
833bf9947603 Fuzzing - get rid of "prefix" for streams Matt Johnston <matt@ucc.asn.au> parents: 1771 diff changeset	286
833bf9947603 Fuzzing - get rid of "prefix" for streams Matt Johnston <matt@ucc.asn.au> parents: 1771 diff changeset	287 for (i = 0; i < num_out; i++) {
1775 8179eabe16c9 fuzzing - fix some wrong types and -lcrypt on macos Matt Johnston <matt@ucc.asn.au> parents: 1774 diff changeset	288 unsigned int choose = nrand48(randstate) % (num_packets1 + num_packets2);
1774 833bf9947603 Fuzzing - get rid of "prefix" for streams Matt Johnston <matt@ucc.asn.au> parents: 1771 diff changeset	289 buffer *p = NULL;
833bf9947603 Fuzzing - get rid of "prefix" for streams Matt Johnston <matt@ucc.asn.au> parents: 1771 diff changeset	290 if (choose < num_packets1) {
833bf9947603 Fuzzing - get rid of "prefix" for streams Matt Johnston <matt@ucc.asn.au> parents: 1771 diff changeset	291 p = packets1[choose];
833bf9947603 Fuzzing - get rid of "prefix" for streams Matt Johnston <matt@ucc.asn.au> parents: 1771 diff changeset	292 } else {
833bf9947603 Fuzzing - get rid of "prefix" for streams Matt Johnston <matt@ucc.asn.au> parents: 1771 diff changeset	293 p = packets2[choose-num_packets1];
1766 b14e0a19bcbe crossover works Matt Johnston <matt@ucc.asn.au> parents: 1765 diff changeset	294 }
1774 833bf9947603 Fuzzing - get rid of "prefix" for streams Matt Johnston <matt@ucc.asn.au> parents: 1771 diff changeset	295 if (oup->len + p->len <= oup->size) {
833bf9947603 Fuzzing - get rid of "prefix" for streams Matt Johnston <matt@ucc.asn.au> parents: 1771 diff changeset	296 buf_putbytes(oup, p->data, p->len);
1766 b14e0a19bcbe crossover works Matt Johnston <matt@ucc.asn.au> parents: 1765 diff changeset	297 }
b14e0a19bcbe crossover works Matt Johnston <matt@ucc.asn.au> parents: 1765 diff changeset	298 }
b14e0a19bcbe crossover works Matt Johnston <matt@ucc.asn.au> parents: 1765 diff changeset	299 }
b14e0a19bcbe crossover works Matt Johnston <matt@ucc.asn.au> parents: 1765 diff changeset	300
b14e0a19bcbe crossover works Matt Johnston <matt@ucc.asn.au> parents: 1765 diff changeset	301 size_t ret_len = MIN(MaxOutSize, oup->len);
b14e0a19bcbe crossover works Matt Johnston <matt@ucc.asn.au> parents: 1765 diff changeset	302 memcpy(Out, oup->data, ret_len);
1774 833bf9947603 Fuzzing - get rid of "prefix" for streams Matt Johnston <matt@ucc.asn.au> parents: 1771 diff changeset	303 // printhex("crossover output", Out, ret_len);
1766 b14e0a19bcbe crossover works Matt Johnston <matt@ucc.asn.au> parents: 1765 diff changeset	304 return ret_len;
b14e0a19bcbe crossover works Matt Johnston <matt@ucc.asn.au> parents: 1765 diff changeset	305 }
b14e0a19bcbe crossover works Matt Johnston <matt@ucc.asn.au> parents: 1765 diff changeset	306

Mercurial > dropbear

annotate fuzz/fuzz-sshpacketmutator.c @ 1861:2b3a8026a6ce