Mercurial > dropbear
annotate fuzz-common.c @ 1529:66a1a2547133 fuzz
The fuzzer has managed to generated DSS key/signature pairs that
verify. Avoid false positives from bogus keys that wouldn't be used
author | Matt Johnston <matt@ucc.asn.au> |
---|---|
date | Wed, 21 Feb 2018 21:49:24 +0800 |
parents | 32f990cc96b1 |
children | 2f64cb3d3007 |
rev | line source |
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1348 | 1 #include "includes.h" |
2 | |
3 #include "includes.h" | |
4 #include "fuzz.h" | |
5 #include "dbutil.h" | |
6 #include "runopts.h" | |
1353 | 7 #include "crypto_desc.h" |
8 #include "session.h" | |
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9 #include "dbrandom.h" |
1457 | 10 #include "bignum.h" |
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11 #include "fuzz-wrapfd.h" |
1348 | 12 |
13 struct dropbear_fuzz_options fuzz; | |
14 | |
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15 static void fuzz_dropbear_log(int UNUSED(priority), const char* format, va_list param); |
1348 | 16 static void load_fixed_hostkeys(void); |
17 | |
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18 void fuzz_common_setup(void) { |
1348 | 19 fuzz.fuzzing = 1; |
1357 | 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; |
1350 | 24 crypto_init(); |
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25 /* let any messages get flushed */ |
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26 setlinebuf(stdout); |
1348 | 27 } |
28 | |
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29 int fuzz_set_input(const uint8_t *Data, size_t Size) { |
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30 |
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31 fuzz.input->data = (unsigned char*)Data; |
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32 fuzz.input->size = Size; |
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33 fuzz.input->len = Size; |
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34 fuzz.input->pos = 0; |
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35 |
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36 memset(&ses, 0x0, sizeof(ses)); |
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37 memset(&svr_ses, 0x0, sizeof(svr_ses)); |
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38 wrapfd_setup(); |
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39 |
1369 | 40 fuzz_seed(); |
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41 |
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42 return DROPBEAR_SUCCESS; |
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43 } |
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44 |
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45 static void fuzz_dropbear_log(int UNUSED(priority), const char* format, va_list param) { |
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46 |
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47 char printbuf[1024]; |
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48 |
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49 #if DEBUG_TRACE |
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50 if (debug_trace) { |
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51 vsnprintf(printbuf, sizeof(printbuf), format, param); |
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52 fprintf(stderr, "%s\n", printbuf); |
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53 } |
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54 #endif |
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55 } |
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56 |
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57 void fuzz_svr_setup(void) { |
1348 | 58 struct passwd *pw; |
59 | |
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60 fuzz_common_setup(); |
1353 | 61 |
62 _dropbear_exit = svr_dropbear_exit; | |
1348 | 63 |
64 char *argv[] = { | |
65 "-E", | |
66 }; | |
67 | |
68 int argc = sizeof(argv) / sizeof(*argv); | |
69 svr_getopts(argc, argv); | |
70 | |
71 /* user lookups might be slow, cache it */ | |
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72 fuzz.pw_name = m_strdup("person"); |
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73 fuzz.pw_dir = m_strdup("/tmp"); |
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74 fuzz.pw_shell = m_strdup("/bin/zsh"); |
1348 | 75 fuzz.pw_passwd = m_strdup("!!zzznope"); |
76 | |
77 load_fixed_hostkeys(); | |
78 } | |
79 | |
80 static void load_fixed_hostkeys(void) { | |
81 #include "fuzz-hostkeys.c" | |
82 | |
83 buffer *b = buf_new(3000); | |
84 enum signkey_type type; | |
85 | |
86 TRACE(("load fixed hostkeys")) | |
87 | |
88 svr_opts.hostkey = new_sign_key(); | |
89 | |
90 buf_setlen(b, 0); | |
91 buf_putbytes(b, keyr, keyr_len); | |
92 buf_setpos(b, 0); | |
93 type = DROPBEAR_SIGNKEY_RSA; | |
94 if (buf_get_priv_key(b, svr_opts.hostkey, &type) == DROPBEAR_FAILURE) { | |
95 dropbear_exit("failed fixed rsa hostkey"); | |
96 } | |
97 | |
98 buf_setlen(b, 0); | |
99 buf_putbytes(b, keyd, keyd_len); | |
100 buf_setpos(b, 0); | |
101 type = DROPBEAR_SIGNKEY_DSS; | |
102 if (buf_get_priv_key(b, svr_opts.hostkey, &type) == DROPBEAR_FAILURE) { | |
103 dropbear_exit("failed fixed dss hostkey"); | |
104 } | |
105 | |
106 buf_setlen(b, 0); | |
107 buf_putbytes(b, keye, keye_len); | |
108 buf_setpos(b, 0); | |
109 type = DROPBEAR_SIGNKEY_ECDSA_NISTP256; | |
110 if (buf_get_priv_key(b, svr_opts.hostkey, &type) == DROPBEAR_FAILURE) { | |
111 dropbear_exit("failed fixed ecdsa hostkey"); | |
112 } | |
113 | |
114 buf_free(b); | |
115 } | |
116 | |
1357 | 117 void fuzz_kex_fakealgos(void) { |
118 ses.newkeys->recv.crypt_mode = &dropbear_mode_none; | |
119 } | |
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120 |
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121 void fuzz_get_socket_address(int UNUSED(fd), char **local_host, char **local_port, |
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122 char **remote_host, char **remote_port, int UNUSED(host_lookup)) { |
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123 if (local_host) { |
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124 *local_host = m_strdup("fuzzlocalhost"); |
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125 } |
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126 if (local_port) { |
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127 *local_port = m_strdup("1234"); |
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128 } |
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129 if (remote_host) { |
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130 *remote_host = m_strdup("fuzzremotehost"); |
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131 } |
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132 if (remote_port) { |
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133 *remote_port = m_strdup("9876"); |
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134 } |
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135 } |
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136 |
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137 /* cut down version of svr_send_msg_kexdh_reply() that skips slow maths. Still populates structures */ |
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138 void fuzz_fake_send_kexdh_reply(void) { |
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139 assert(!ses.dh_K); |
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140 m_mp_alloc_init_multi(&ses.dh_K, NULL); |
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141 mp_set_int(ses.dh_K, 12345678); |
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142 finish_kexhashbuf(); |
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143 } |
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144 |
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145 int fuzz_run_preauth(const uint8_t *Data, size_t Size, int skip_kexmaths) { |
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146 static int once = 0; |
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147 if (!once) { |
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148 fuzz_svr_setup(); |
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149 fuzz.skip_kexmaths = skip_kexmaths; |
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150 once = 1; |
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151 } |
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152 |
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153 if (fuzz_set_input(Data, Size) == DROPBEAR_FAILURE) { |
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154 return 0; |
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155 } |
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156 |
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157 // get prefix. input format is |
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158 // string prefix |
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159 // uint32 wrapfd seed |
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160 // ... to be extended later |
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161 // [bytes] ssh input stream |
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162 |
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163 // be careful to avoid triggering buffer.c assertions |
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164 if (fuzz.input->len < 8) { |
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165 return 0; |
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166 } |
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167 size_t prefix_size = buf_getint(fuzz.input); |
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168 if (prefix_size != 4) { |
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169 return 0; |
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170 } |
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171 uint32_t wrapseed = buf_getint(fuzz.input); |
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172 wrapfd_setseed(wrapseed); |
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173 |
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174 int fakesock = 20; |
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175 wrapfd_add(fakesock, fuzz.input, PLAIN); |
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176 |
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177 m_malloc_set_epoch(1); |
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178 if (setjmp(fuzz.jmp) == 0) { |
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179 svr_session(fakesock, fakesock); |
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180 m_malloc_free_epoch(1, 0); |
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181 } else { |
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182 m_malloc_free_epoch(1, 1); |
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183 TRACE(("dropbear_exit longjmped")) |
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184 // dropbear_exit jumped here |
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185 } |
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186 |
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187 return 0; |
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188 } |