Mercurial > dropbear

annotate fuzz-common.c @ 1597:8f7b6f75aa58

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fix uninitialised memory in fuzzer codepath
author Matt Johnston <matt@ucc.asn.au>
date Tue, 06 Mar 2018 22:02:19 +0800
parents 35af85194268
children d32bcb5c557d
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 #include "includes.h"
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2
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3 #include "includes.h"
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4 #include "fuzz.h"
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5 #include "dbutil.h"
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6 #include "runopts.h"
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7 #include "crypto_desc.h"
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8 #include "session.h"
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9 #include "dbrandom.h"
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10 #include "bignum.h"
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11 #include "fuzz-wrapfd.h"
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12
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13 struct dropbear_fuzz_options fuzz;
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14
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15 static void fuzz_dropbear_log(int UNUSED(priority), const char* format, va_list param);
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16 static void load_fixed_hostkeys(void);
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17
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18 void fuzz_common_setup(void) {
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19 fuzz.fuzzing = 1;
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20 fuzz.wrapfds = 1;
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21 fuzz.do_jmp = 1;
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22 fuzz.input = m_malloc(sizeof(buffer));
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23 _dropbear_log = fuzz_dropbear_log;
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24 crypto_init();
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25 fuzz_seed();
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26 /* let any messages get flushed */
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27 setlinebuf(stdout);
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28 }
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29
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30 int fuzz_set_input(const uint8_t *Data, size_t Size) {
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31
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32 fuzz.input->data = (unsigned char*)Data;
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33 fuzz.input->size = Size;
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34 fuzz.input->len = Size;
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35 fuzz.input->pos = 0;
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36
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37 memset(&ses, 0x0, sizeof(ses));
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38 memset(&svr_ses, 0x0, sizeof(svr_ses));
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39 wrapfd_setup();
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40
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41 fuzz_seed();
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42
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43 return DROPBEAR_SUCCESS;
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44 }
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45
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46 #if DEBUG_TRACE
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47 static void fuzz_dropbear_log(int UNUSED(priority), const char* format, va_list param) {
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48 if (debug_trace) {
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49 char printbuf[1024];
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50 vsnprintf(printbuf, sizeof(printbuf), format, param);
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51 fprintf(stderr, "%s\n", printbuf);
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52 }
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53 }
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54 #else
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55 static void fuzz_dropbear_log(int UNUSED(priority), const char* UNUSED(format), va_list UNUSED(param)) {
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56 /* No print */
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57 }
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58 #endif /* DEBUG_TRACE */
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59
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60 void fuzz_svr_setup(void) {
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61 fuzz_common_setup();
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62
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63 _dropbear_exit = svr_dropbear_exit;
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64
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65 char *argv[] = {
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66 "-E",
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67 };
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68
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69 int argc = sizeof(argv) / sizeof(*argv);
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70 svr_getopts(argc, argv);
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71
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72 /* user lookups might be slow, cache it */
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73 fuzz.pw_name = m_strdup("person");
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74 fuzz.pw_dir = m_strdup("/tmp");
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75 fuzz.pw_shell = m_strdup("/bin/zsh");
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76 fuzz.pw_passwd = m_strdup("!!zzznope");
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77
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78 load_fixed_hostkeys();
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79 }
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80
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81 static void load_fixed_hostkeys(void) {
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82 #include "fuzz-hostkeys.c"
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83
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84 buffer *b = buf_new(3000);
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85 enum signkey_type type;
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86
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87 TRACE(("load fixed hostkeys"))
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88
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89 svr_opts.hostkey = new_sign_key();
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90
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91 buf_setlen(b, 0);
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92 buf_putbytes(b, keyr, keyr_len);
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93 buf_setpos(b, 0);
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94 type = DROPBEAR_SIGNKEY_RSA;
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95 if (buf_get_priv_key(b, svr_opts.hostkey, &type) == DROPBEAR_FAILURE) {
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96 dropbear_exit("failed fixed rsa hostkey");
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97 }
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98
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99 buf_setlen(b, 0);
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100 buf_putbytes(b, keyd, keyd_len);
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101 buf_setpos(b, 0);
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102 type = DROPBEAR_SIGNKEY_DSS;
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103 if (buf_get_priv_key(b, svr_opts.hostkey, &type) == DROPBEAR_FAILURE) {
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104 dropbear_exit("failed fixed dss hostkey");
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105 }
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106
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107 buf_setlen(b, 0);
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108 buf_putbytes(b, keye, keye_len);
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109 buf_setpos(b, 0);
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110 type = DROPBEAR_SIGNKEY_ECDSA_NISTP256;
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111 if (buf_get_priv_key(b, svr_opts.hostkey, &type) == DROPBEAR_FAILURE) {
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112 dropbear_exit("failed fixed ecdsa hostkey");
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113 }
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114
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115 buf_free(b);
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116 }
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117
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118 void fuzz_kex_fakealgos(void) {
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119 ses.newkeys->recv.crypt_mode = &dropbear_mode_none;
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120 }
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121
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122 void fuzz_get_socket_address(int UNUSED(fd), char **local_host, char **local_port,
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123 char **remote_host, char **remote_port, int UNUSED(host_lookup)) {
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124 if (local_host) {
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125 *local_host = m_strdup("fuzzlocalhost");
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126 }
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127 if (local_port) {
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128 *local_port = m_strdup("1234");
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129 }
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130 if (remote_host) {
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131 *remote_host = m_strdup("fuzzremotehost");
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132 }
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133 if (remote_port) {
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134 *remote_port = m_strdup("9876");
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135 }
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136 }
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137
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138 /* cut down version of svr_send_msg_kexdh_reply() that skips slow maths. Still populates structures */
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139 void fuzz_fake_send_kexdh_reply(void) {
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140 assert(!ses.dh_K);
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141 m_mp_alloc_init_multi(&ses.dh_K, NULL);
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142 mp_set_int(ses.dh_K, 12345678);
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143 finish_kexhashbuf();
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144 }
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145
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146 int fuzz_run_preauth(const uint8_t *Data, size_t Size, int skip_kexmaths) {
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147 static int once = 0;
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148 if (!once) {
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149 fuzz_svr_setup();
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150 fuzz.skip_kexmaths = skip_kexmaths;
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151 once = 1;
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152 }
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153
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154 if (fuzz_set_input(Data, Size) == DROPBEAR_FAILURE) {
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155 return 0;
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156 }
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157
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158 /*
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159 get prefix. input format is
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160 string prefix
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161 uint32 wrapfd seed
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162 ... to be extended later
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163 [bytes] ssh input stream
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164 */
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165
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166 /* be careful to avoid triggering buffer.c assertions */
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167 if (fuzz.input->len < 8) {
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168 return 0;
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169 }
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170 size_t prefix_size = buf_getint(fuzz.input);
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171 if (prefix_size != 4) {
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172 return 0;
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173 }
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174 uint32_t wrapseed = buf_getint(fuzz.input);
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175 wrapfd_setseed(wrapseed);
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176
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177 int fakesock = 20;
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178 wrapfd_add(fakesock, fuzz.input, PLAIN);
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179
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180 m_malloc_set_epoch(1);
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181 if (setjmp(fuzz.jmp) == 0) {
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182 svr_session(fakesock, fakesock);
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183 m_malloc_free_epoch(1, 0);
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184 } else {
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185 m_malloc_free_epoch(1, 1);
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186 TRACE(("dropbear_exit longjmped"))
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187 /* dropbear_exit jumped here */
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188 }
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189
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190 return 0;
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191 }
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192
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193 const void* fuzz_get_algo(const algo_type *algos, const char* name) {
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194 const algo_type *t;
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195 for (t = algos; t->name; t++) {
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196 if (strcmp(t->name, name) == 0) {
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197 return t->data;
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198 }
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199 }
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200 assert(0);
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201 }