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annotate fuzz/fuzz-sshpacketmutator.c @ 1765:b688c884dad7

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Fix fuzz-sshpacketmutator to work
author Matt Johnston <matt@ucc.asn.au>
date Mon, 26 Oct 2020 22:52:07 +0800
parents 2406a9987810
children b14e0a19bcbe
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 #include "fuzz.h"
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2 #include "dbutil.h"
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3
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4 size_t LLVMFuzzerMutate(uint8_t *Data, size_t Size, size_t MaxSize);
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5
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6 static void fuzz_get_packets(buffer *inp, buffer **out_packets, unsigned int *num_out_packets) {
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7 /* Skip any existing banner. Format is
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8 SSH-protoversion-softwareversion SP comments CR LF
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9 so we look for SSH-2. then a subsequent LF */
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10 unsigned char* version = memmem(inp->data, inp->len, "SSH-2.", strlen("SSH-2."));
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11 if (version) {
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12 buf_incrpos(inp, version - inp->data);
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13 unsigned char* newline = memchr(&inp->data[inp->pos], '\n', inp->len - inp->pos);
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14 if (newline) {
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15 buf_incrpos(inp, newline - &inp->data[inp->pos]+1);
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16 } else {
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17 /* Give up on any version string */
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18 buf_setpos(inp, 0);
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19 }
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20 }
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21
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22 const unsigned int max_out_packets = *num_out_packets;
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23 *num_out_packets = 0;
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24 while (1) {
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25 if (inp->pos + 4 > inp->len) {
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26 /* End of input */
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27 break;
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28 }
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29
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30 if (*num_out_packets >= max_out_packets) {
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31 /* End of output */
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32 break;
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33 }
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34
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35 /* Read packet */
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36 //printf("at %d\n", inp->pos);
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37 //printhex("lenget", buf_getptr(inp, 48), 48);
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38 unsigned int packet_len = buf_getint(inp);
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39 // printf("len %u\n", packet_len);
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40 if (packet_len > RECV_MAX_PACKET_LEN-4) {
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41 /* Bad length, try skipping a single byte */
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42 buf_decrpos(inp, 3);
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43 continue;
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44 }
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45 packet_len = MIN(packet_len, inp->len - inp->pos);
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46
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47 /* Copy to output buffer */
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48 buffer* new_packet = buf_new(RECV_MAX_PACKET_LEN);
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49 buf_putint(new_packet, packet_len);
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50 buf_putbytes(new_packet, buf_getptr(inp, packet_len), packet_len);
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51 buf_incrpos(inp, packet_len);
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52 // printf("incr pos %d to %d\n", packet_len, inp->pos);
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53
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54 out_packets[*num_out_packets] = new_packet;
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55 (*num_out_packets)++;
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56 }
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57 }
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58
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59 /* Mutate in-place */
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60 void buf_llvm_mutate(buffer *buf) {
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61 /* Position it after packet_length and padding_length */
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62 const unsigned int offset = 5;
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63 if (buf->len < offset) {
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64 return;
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65 }
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66 buf_setpos(buf, offset);
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67 size_t max_size = buf->size - buf->pos;
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68 size_t new_size = LLVMFuzzerMutate(buf_getwriteptr(buf, max_size),
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69 buf->len - buf->pos, max_size);
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70 buf_setpos(buf, 0);
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71 buf_putint(buf, new_size);
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72 buf_setlen(buf, offset + new_size);
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73 }
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74
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75
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76 static const char* FIXED_VERSION = "SSH-2.0-dbfuzz\r\n";
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77 static const size_t MAX_FUZZ_PACKETS = 500;
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78 /* XXX This might need tuning */
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79 static const size_t MAX_OUT_SIZE = 50000;
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80
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81 size_t LLVMFuzzerCustomMutator(uint8_t *Data, size_t Size,
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82 size_t MaxSize, unsigned int Seed) {
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83
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84 /* Avoid some allocations */
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85 /* XXX perhaps this complication isn't worthwhile */
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86 static buffer buf_oup, buf_alloc_packetA, buf_alloc_packetB;
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87 static buffer *oup = &buf_oup;
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88 static buffer *alloc_packetA = &buf_alloc_packetA;
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89 static buffer *alloc_packetB = &buf_alloc_packetB;
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90 static int once = 1;
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91 if (once) {
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92 once = 0;
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93 // malloc doesn't get intercepted by epoch deallocator
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94 oup->size = MAX_OUT_SIZE;
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95 alloc_packetA->size = RECV_MAX_PACKET_LEN;
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96 alloc_packetB->size = RECV_MAX_PACKET_LEN;
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97 oup->data = malloc(oup->size);
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98 alloc_packetA->data = malloc(alloc_packetA->size);
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99 alloc_packetB->data = malloc(alloc_packetB->size);
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100 }
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101 alloc_packetA->pos = 0;
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102 alloc_packetA->len = 0;
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103 alloc_packetB->pos = 0;
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104 alloc_packetB->len = 0;
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105 oup->pos = 0;
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106 oup->len = 0;
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107
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108 unsigned int i;
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109 unsigned short randstate[3] = {0,0,0};
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110 memcpy(randstate, &Seed, sizeof(Seed));
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111
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112 // printhex("mutator input", Data, Size);
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113 #if 0
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114 /* 1% chance straight llvm mutate */
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115 if (nrand48(randstate) % 100 == 0) {
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116 return LLVMFuzzerMutate(Data, Size, MaxSize);
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117 }
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118 #endif
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119
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120 buffer inp_buf = {.data = Data, .size = Size, .len = Size, .pos = 0};
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121 buffer *inp = &inp_buf;
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122
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123 /* Parse packets */
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124 buffer* packets[MAX_FUZZ_PACKETS];
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125 unsigned int num_packets = MAX_FUZZ_PACKETS;
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126 fuzz_get_packets(inp, packets, &num_packets);
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127 // printf("%d packets\n", num_packets);
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128
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129 if (num_packets == 0) {
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130 // gotta do something
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131 memcpy(Data, FIXED_VERSION, MIN(strlen(FIXED_VERSION), MaxSize));
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132 return LLVMFuzzerMutate(Data, Size, MaxSize);
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133 }
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134
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135 /* Start output */
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136 /* Put a new banner to output */
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137 buf_putbytes(oup, FIXED_VERSION, strlen(FIXED_VERSION));
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138
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139 /* Iterate output */
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140 for (i = 0; i < num_packets+1; i++) {
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141 // These are pointers to output
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142 buffer *out_packetA = NULL, *out_packetB = NULL;
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143 alloc_packetA->pos = 0;
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144 alloc_packetA->len = 0;
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145 alloc_packetB->pos = 0;
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146 alloc_packetB->len = 0;
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147
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148 /* 5% chance each */
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149 const int optA = nrand48(randstate) % 20;
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150 if (optA == 0) {
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151 /* Copy another */
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152 unsigned int other = nrand48(randstate) % num_packets;
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153 out_packetA = packets[other];
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154 // printf("%d copy another %d\n", i, other);
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155 }
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156 if (optA == 1) {
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157 /* Mutate another */
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158 unsigned int other = nrand48(randstate) % num_packets;
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159 buffer *from = packets[other];
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160 buf_putbytes(alloc_packetA, from->data, from->len);
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161 out_packetA = alloc_packetA;
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162 buf_llvm_mutate(out_packetA);
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163 // printf("%d mutate another %d\n", i, other);
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164 }
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165
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166 if (i < num_packets) {
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167 int optB = nrand48(randstate) % 10;
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168 if (optB == 1) {
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169 /* 10% chance of drop */
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170 /* Drop it */
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171 // printf("%d drop\n", i);
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172 } else if (optB <= 6) {
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173 /* Mutate it, 50% chance */
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174 // printf("%d mutate\n", i);
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175 buffer *from = packets[nrand48(randstate) % num_packets];
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176 buf_putbytes(alloc_packetB, from->data, from->len);
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177 out_packetB = alloc_packetB;
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178 buf_llvm_mutate(out_packetB);
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179 } else {
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180 /* Copy as-is */
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181 out_packetB = packets[i];
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182 // printf("%d as-is\n", i);
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183 }
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184 }
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185
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186 if (out_packetA && oup->len + out_packetA->len <= oup->size) {
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187 buf_putbytes(oup, out_packetA->data, out_packetA->len);
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188 }
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189 if (out_packetB && oup->len + out_packetB->len <= oup->size) {
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190 buf_putbytes(oup, out_packetB->data, out_packetB->len);
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191 }
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192 }
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193
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194 for (i = 0; i < num_packets; i++) {
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195 buf_free(packets[i]);
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196 }
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197
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198 size_t ret_len = MIN(MaxSize, oup->len);
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199 memcpy(Data, oup->data, ret_len);
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200 // printhex("mutator done", Data, ret_len);
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201 return ret_len;
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202 }
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203
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204