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

Fix fuzz-sshpacketmutator to work
author Matt Johnston <matt@ucc.asn.au>
date Mon, 26 Oct 2020 22:52:07 +0800
parents 2406a9987810
children 3e1e1f82eba6
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 "atomicio.h"
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12 #include "fuzz-wrapfd.h"
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13
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14 /* fuzz.h redefines stderr, we don't want that here */
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15 #undef stderr
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16
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17 struct dropbear_fuzz_options fuzz;
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18
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19 static void fuzz_dropbear_log(int UNUSED(priority), const char* format, va_list param);
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20 static void load_fixed_hostkeys(void);
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21 static void load_fixed_client_key(void);
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22
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23 // This runs automatically before main, due to contructor attribute in fuzz.h
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24 void fuzz_early_setup(void) {
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25 /* Set stderr to point to normal stderr by default */
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26 fuzz.stderr = stderr;
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27 }
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28
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29 void fuzz_common_setup(void) {
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30 disallow_core();
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31 fuzz.fuzzing = 1;
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32 fuzz.wrapfds = 1;
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33 fuzz.do_jmp = 1;
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34 fuzz.input = m_malloc(sizeof(buffer));
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35 _dropbear_log = fuzz_dropbear_log;
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36 crypto_init();
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37 fuzz_seed("start", 5);
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38 /* let any messages get flushed */
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39 setlinebuf(stdout);
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40 #if DEBUG_TRACE
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41 if (debug_trace)
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42 {
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43 fprintf(stderr, "Dropbear fuzzer: -v specified, not disabling stderr output\n");
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44 }
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45 else
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46 #endif
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47 {
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48 // fprintf(stderr, "Dropbear fuzzer: Disabling stderr output\n");
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49 // fuzz.stderr = fopen("/dev/null", "w");
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50 // assert(fuzz.stderr);
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51 }
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52 }
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53
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54 int fuzz_set_input(const uint8_t *Data, size_t Size) {
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55
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56 fuzz.input->data = (unsigned char*)Data;
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57 fuzz.input->size = Size;
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58 fuzz.input->len = Size;
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59 fuzz.input->pos = 0;
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60
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61 memset(&ses, 0x0, sizeof(ses));
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62 memset(&svr_ses, 0x0, sizeof(svr_ses));
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63 memset(&cli_ses, 0x0, sizeof(cli_ses));
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64 wrapfd_setup(fuzz.input);
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65
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66 fuzz_seed(fuzz.input->data, MIN(fuzz.input->len, 16));
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67
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68 return DROPBEAR_SUCCESS;
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69 }
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70
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71 #if DEBUG_TRACE
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72 static void fuzz_dropbear_log(int UNUSED(priority), const char* format, va_list param) {
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73 if (debug_trace) {
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74 char printbuf[1024];
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75 vsnprintf(printbuf, sizeof(printbuf), format, param);
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76 fprintf(stderr, "%s\n", printbuf);
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77 }
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78 }
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79 #else
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80 static void fuzz_dropbear_log(int UNUSED(priority), const char* UNUSED(format), va_list UNUSED(param)) {
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81 /* No print */
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82 }
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83 #endif /* DEBUG_TRACE */
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84
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85 void fuzz_svr_setup(void) {
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86 fuzz_common_setup();
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87
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88 _dropbear_exit = svr_dropbear_exit;
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89
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90 char *argv[] = {
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91 "dropbear",
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92 "-E",
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93 };
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94
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95 int argc = sizeof(argv) / sizeof(*argv);
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96 svr_getopts(argc, argv);
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97
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98 load_fixed_hostkeys();
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99 }
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100
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101 void fuzz_cli_setup(void) {
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102 fuzz_common_setup();
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103
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104 _dropbear_exit = cli_dropbear_exit;
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105 _dropbear_log = cli_dropbear_log;
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106
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107 char *argv[] = {
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108 "dbclient",
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109 "-y",
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110 "localhost",
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111 "uptime"
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112 };
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113
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114 int argc = sizeof(argv) / sizeof(*argv);
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115 cli_getopts(argc, argv);
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116
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117 load_fixed_client_key();
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118 /* Avoid password prompt */
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119 setenv(DROPBEAR_PASSWORD_ENV, "password", 1);
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120 }
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121
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122 #include "fuzz-hostkeys.c"
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123
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124 static void load_fixed_client_key(void) {
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125
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126 buffer *b = buf_new(3000);
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127 sign_key *key;
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128 enum signkey_type keytype;
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129
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130 key = new_sign_key();
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131 keytype = DROPBEAR_SIGNKEY_ANY;
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132 buf_putbytes(b, keyed25519, keyed25519_len);
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133 buf_setpos(b, 0);
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134 if (buf_get_priv_key(b, key, &keytype) == DROPBEAR_FAILURE) {
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135 dropbear_exit("failed fixed ed25519 hostkey");
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136 }
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137 list_append(cli_opts.privkeys, key);
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138
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139 buf_free(b);
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140 }
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141
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142 static void load_fixed_hostkeys(void) {
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143
5c2899e35b63 fuzz harness
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
144 buffer *b = buf_new(3000);
5c2899e35b63 fuzz harness
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
145 enum signkey_type type;
5c2899e35b63 fuzz harness
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
146
5c2899e35b63 fuzz harness
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
147 TRACE(("load fixed hostkeys"))
5c2899e35b63 fuzz harness
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
148
5c2899e35b63 fuzz harness
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
149 svr_opts.hostkey = new_sign_key();
5c2899e35b63 fuzz harness
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
150
5c2899e35b63 fuzz harness
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
151 buf_setlen(b, 0);
5c2899e35b63 fuzz harness
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
152 buf_putbytes(b, keyr, keyr_len);
5c2899e35b63 fuzz harness
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
153 buf_setpos(b, 0);
5c2899e35b63 fuzz harness
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
154 type = DROPBEAR_SIGNKEY_RSA;
5c2899e35b63 fuzz harness
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
155 if (buf_get_priv_key(b, svr_opts.hostkey, &type) == DROPBEAR_FAILURE) {
5c2899e35b63 fuzz harness
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
156 dropbear_exit("failed fixed rsa hostkey");
5c2899e35b63 fuzz harness
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
157 }
5c2899e35b63 fuzz harness
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
158
5c2899e35b63 fuzz harness
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
159 buf_setlen(b, 0);
5c2899e35b63 fuzz harness
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
160 buf_putbytes(b, keyd, keyd_len);
5c2899e35b63 fuzz harness
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
161 buf_setpos(b, 0);
5c2899e35b63 fuzz harness
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
162 type = DROPBEAR_SIGNKEY_DSS;
5c2899e35b63 fuzz harness
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
163 if (buf_get_priv_key(b, svr_opts.hostkey, &type) == DROPBEAR_FAILURE) {
5c2899e35b63 fuzz harness
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
164 dropbear_exit("failed fixed dss hostkey");
5c2899e35b63 fuzz harness
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
165 }
5c2899e35b63 fuzz harness
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
166
5c2899e35b63 fuzz harness
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
167 buf_setlen(b, 0);
5c2899e35b63 fuzz harness
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
168 buf_putbytes(b, keye, keye_len);
5c2899e35b63 fuzz harness
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
169 buf_setpos(b, 0);
5c2899e35b63 fuzz harness
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
170 type = DROPBEAR_SIGNKEY_ECDSA_NISTP256;
5c2899e35b63 fuzz harness
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
171 if (buf_get_priv_key(b, svr_opts.hostkey, &type) == DROPBEAR_FAILURE) {
5c2899e35b63 fuzz harness
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
172 dropbear_exit("failed fixed ecdsa hostkey");
5c2899e35b63 fuzz harness
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
173 }
5c2899e35b63 fuzz harness
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
174
1659
d32bcb5c557d Add Ed25519 support (#91)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents: 1589
diff changeset
175 buf_setlen(b, 0);
d32bcb5c557d Add Ed25519 support (#91)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents: 1589
diff changeset
176 buf_putbytes(b, keyed25519, keyed25519_len);
d32bcb5c557d Add Ed25519 support (#91)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents: 1589
diff changeset
177 buf_setpos(b, 0);
d32bcb5c557d Add Ed25519 support (#91)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents: 1589
diff changeset
178 type = DROPBEAR_SIGNKEY_ED25519;
d32bcb5c557d Add Ed25519 support (#91)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents: 1589
diff changeset
179 if (buf_get_priv_key(b, svr_opts.hostkey, &type) == DROPBEAR_FAILURE) {
d32bcb5c557d Add Ed25519 support (#91)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents: 1589
diff changeset
180 dropbear_exit("failed fixed ed25519 hostkey");
d32bcb5c557d Add Ed25519 support (#91)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents: 1589
diff changeset
181 }
d32bcb5c557d Add Ed25519 support (#91)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents: 1589
diff changeset
182
1348
5c2899e35b63 fuzz harness
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
183 buf_free(b);
5c2899e35b63 fuzz harness
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
184 }
5c2899e35b63 fuzz harness
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
185
1357
08f4fa4dc6a0 closer to working
Matt Johnston <matt@ucc.asn.au>
parents: 1356
diff changeset
186 void fuzz_kex_fakealgos(void) {
08f4fa4dc6a0 closer to working
Matt Johnston <matt@ucc.asn.au>
parents: 1356
diff changeset
187 ses.newkeys->recv.crypt_mode = &dropbear_mode_none;
08f4fa4dc6a0 closer to working
Matt Johnston <matt@ucc.asn.au>
parents: 1356
diff changeset
188 }
1383
f03cfe9c76ac Disable setnonblocking(), get_socket_address(), set_sock_priority()
Matt Johnston <matt@ucc.asn.au>
parents: 1377
diff changeset
189
f03cfe9c76ac Disable setnonblocking(), get_socket_address(), set_sock_priority()
Matt Johnston <matt@ucc.asn.au>
parents: 1377
diff changeset
190 void fuzz_get_socket_address(int UNUSED(fd), char **local_host, char **local_port,
f03cfe9c76ac Disable setnonblocking(), get_socket_address(), set_sock_priority()
Matt Johnston <matt@ucc.asn.au>
parents: 1377
diff changeset
191 char **remote_host, char **remote_port, int UNUSED(host_lookup)) {
f03cfe9c76ac Disable setnonblocking(), get_socket_address(), set_sock_priority()
Matt Johnston <matt@ucc.asn.au>
parents: 1377
diff changeset
192 if (local_host) {
f03cfe9c76ac Disable setnonblocking(), get_socket_address(), set_sock_priority()
Matt Johnston <matt@ucc.asn.au>
parents: 1377
diff changeset
193 *local_host = m_strdup("fuzzlocalhost");
f03cfe9c76ac Disable setnonblocking(), get_socket_address(), set_sock_priority()
Matt Johnston <matt@ucc.asn.au>
parents: 1377
diff changeset
194 }
f03cfe9c76ac Disable setnonblocking(), get_socket_address(), set_sock_priority()
Matt Johnston <matt@ucc.asn.au>
parents: 1377
diff changeset
195 if (local_port) {
f03cfe9c76ac Disable setnonblocking(), get_socket_address(), set_sock_priority()
Matt Johnston <matt@ucc.asn.au>
parents: 1377
diff changeset
196 *local_port = m_strdup("1234");
f03cfe9c76ac Disable setnonblocking(), get_socket_address(), set_sock_priority()
Matt Johnston <matt@ucc.asn.au>
parents: 1377
diff changeset
197 }
f03cfe9c76ac Disable setnonblocking(), get_socket_address(), set_sock_priority()
Matt Johnston <matt@ucc.asn.au>
parents: 1377
diff changeset
198 if (remote_host) {
f03cfe9c76ac Disable setnonblocking(), get_socket_address(), set_sock_priority()
Matt Johnston <matt@ucc.asn.au>
parents: 1377
diff changeset
199 *remote_host = m_strdup("fuzzremotehost");
f03cfe9c76ac Disable setnonblocking(), get_socket_address(), set_sock_priority()
Matt Johnston <matt@ucc.asn.au>
parents: 1377
diff changeset
200 }
f03cfe9c76ac Disable setnonblocking(), get_socket_address(), set_sock_priority()
Matt Johnston <matt@ucc.asn.au>
parents: 1377
diff changeset
201 if (remote_port) {
f03cfe9c76ac Disable setnonblocking(), get_socket_address(), set_sock_priority()
Matt Johnston <matt@ucc.asn.au>
parents: 1377
diff changeset
202 *remote_port = m_strdup("9876");
f03cfe9c76ac Disable setnonblocking(), get_socket_address(), set_sock_priority()
Matt Johnston <matt@ucc.asn.au>
parents: 1377
diff changeset
203 }
f03cfe9c76ac Disable setnonblocking(), get_socket_address(), set_sock_priority()
Matt Johnston <matt@ucc.asn.au>
parents: 1377
diff changeset
204 }
1456
a90fdd2d2ed8 add fuzzer-preauth_nomaths
Matt Johnston <matt@ucc.asn.au>
parents: 1386
diff changeset
205
a90fdd2d2ed8 add fuzzer-preauth_nomaths
Matt Johnston <matt@ucc.asn.au>
parents: 1386
diff changeset
206 /* cut down version of svr_send_msg_kexdh_reply() that skips slow maths. Still populates structures */
a90fdd2d2ed8 add fuzzer-preauth_nomaths
Matt Johnston <matt@ucc.asn.au>
parents: 1386
diff changeset
207 void fuzz_fake_send_kexdh_reply(void) {
a90fdd2d2ed8 add fuzzer-preauth_nomaths
Matt Johnston <matt@ucc.asn.au>
parents: 1386
diff changeset
208 assert(!ses.dh_K);
a90fdd2d2ed8 add fuzzer-preauth_nomaths
Matt Johnston <matt@ucc.asn.au>
parents: 1386
diff changeset
209 m_mp_alloc_init_multi(&ses.dh_K, NULL);
1692
1051e4eea25a Update LibTomMath to 1.2.0 (#84)
Steffen Jaeckel <s@jaeckel.eu>
parents: 1659
diff changeset
210 mp_set_ul(ses.dh_K, 12345678uL);
1456
a90fdd2d2ed8 add fuzzer-preauth_nomaths
Matt Johnston <matt@ucc.asn.au>
parents: 1386
diff changeset
211 finish_kexhashbuf();
a90fdd2d2ed8 add fuzzer-preauth_nomaths
Matt Johnston <matt@ucc.asn.au>
parents: 1386
diff changeset
212 }
a90fdd2d2ed8 add fuzzer-preauth_nomaths
Matt Johnston <matt@ucc.asn.au>
parents: 1386
diff changeset
213
1740
dfbe947bdf0d Make wrapfd share a common buffer for all FDs
Matt Johnston <matt@ucc.asn.au>
parents: 1692
diff changeset
214 /* fake version of spawn_command() */
dfbe947bdf0d Make wrapfd share a common buffer for all FDs
Matt Johnston <matt@ucc.asn.au>
parents: 1692
diff changeset
215 int fuzz_spawn_command(int *ret_writefd, int *ret_readfd, int *ret_errfd, pid_t *ret_pid) {
dfbe947bdf0d Make wrapfd share a common buffer for all FDs
Matt Johnston <matt@ucc.asn.au>
parents: 1692
diff changeset
216 *ret_writefd = wrapfd_new();
dfbe947bdf0d Make wrapfd share a common buffer for all FDs
Matt Johnston <matt@ucc.asn.au>
parents: 1692
diff changeset
217 *ret_readfd = wrapfd_new();
dfbe947bdf0d Make wrapfd share a common buffer for all FDs
Matt Johnston <matt@ucc.asn.au>
parents: 1692
diff changeset
218 if (ret_errfd) {
dfbe947bdf0d Make wrapfd share a common buffer for all FDs
Matt Johnston <matt@ucc.asn.au>
parents: 1692
diff changeset
219 *ret_errfd = wrapfd_new();
dfbe947bdf0d Make wrapfd share a common buffer for all FDs
Matt Johnston <matt@ucc.asn.au>
parents: 1692
diff changeset
220 }
1742
6e71440b1e47 Add fuzzer-client_nomaths, fix client fuzzer
Matt Johnston <matt@ucc.asn.au>
parents: 1741
diff changeset
221 *ret_pid = 999;
1740
dfbe947bdf0d Make wrapfd share a common buffer for all FDs
Matt Johnston <matt@ucc.asn.au>
parents: 1692
diff changeset
222 return DROPBEAR_SUCCESS;
dfbe947bdf0d Make wrapfd share a common buffer for all FDs
Matt Johnston <matt@ucc.asn.au>
parents: 1692
diff changeset
223 }
dfbe947bdf0d Make wrapfd share a common buffer for all FDs
Matt Johnston <matt@ucc.asn.au>
parents: 1692
diff changeset
224
1456
a90fdd2d2ed8 add fuzzer-preauth_nomaths
Matt Johnston <matt@ucc.asn.au>
parents: 1386
diff changeset
225 int fuzz_run_preauth(const uint8_t *Data, size_t Size, int skip_kexmaths) {
a90fdd2d2ed8 add fuzzer-preauth_nomaths
Matt Johnston <matt@ucc.asn.au>
parents: 1386
diff changeset
226 static int once = 0;
a90fdd2d2ed8 add fuzzer-preauth_nomaths
Matt Johnston <matt@ucc.asn.au>
parents: 1386
diff changeset
227 if (!once) {
a90fdd2d2ed8 add fuzzer-preauth_nomaths
Matt Johnston <matt@ucc.asn.au>
parents: 1386
diff changeset
228 fuzz_svr_setup();
a90fdd2d2ed8 add fuzzer-preauth_nomaths
Matt Johnston <matt@ucc.asn.au>
parents: 1386
diff changeset
229 fuzz.skip_kexmaths = skip_kexmaths;
a90fdd2d2ed8 add fuzzer-preauth_nomaths
Matt Johnston <matt@ucc.asn.au>
parents: 1386
diff changeset
230 once = 1;
a90fdd2d2ed8 add fuzzer-preauth_nomaths
Matt Johnston <matt@ucc.asn.au>
parents: 1386
diff changeset
231 }
a90fdd2d2ed8 add fuzzer-preauth_nomaths
Matt Johnston <matt@ucc.asn.au>
parents: 1386
diff changeset
232
a90fdd2d2ed8 add fuzzer-preauth_nomaths
Matt Johnston <matt@ucc.asn.au>
parents: 1386
diff changeset
233 if (fuzz_set_input(Data, Size) == DROPBEAR_FAILURE) {
a90fdd2d2ed8 add fuzzer-preauth_nomaths
Matt Johnston <matt@ucc.asn.au>
parents: 1386
diff changeset
234 return 0;
a90fdd2d2ed8 add fuzzer-preauth_nomaths
Matt Johnston <matt@ucc.asn.au>
parents: 1386
diff changeset
235 }
a90fdd2d2ed8 add fuzzer-preauth_nomaths
Matt Johnston <matt@ucc.asn.au>
parents: 1386
diff changeset
236
1559
92c93b4a3646 Fix to be able to compile normal(ish) binaries with --enable-fuzz
Matt Johnston <matt@ucc.asn.au>
parents: 1558
diff changeset
237 /*
1741
d1b279aa5ed1 Get client fuzzer building and starting (fails straight away)
Matt Johnston <matt@ucc.asn.au>
parents: 1740
diff changeset
238 get prefix, allowing for future extensibility. input format is
1559
92c93b4a3646 Fix to be able to compile normal(ish) binaries with --enable-fuzz
Matt Johnston <matt@ucc.asn.au>
parents: 1558
diff changeset
239 string prefix
92c93b4a3646 Fix to be able to compile normal(ish) binaries with --enable-fuzz
Matt Johnston <matt@ucc.asn.au>
parents: 1558
diff changeset
240 uint32 wrapfd seed
92c93b4a3646 Fix to be able to compile normal(ish) binaries with --enable-fuzz
Matt Johnston <matt@ucc.asn.au>
parents: 1558
diff changeset
241 ... to be extended later
92c93b4a3646 Fix to be able to compile normal(ish) binaries with --enable-fuzz
Matt Johnston <matt@ucc.asn.au>
parents: 1558
diff changeset
242 [bytes] ssh input stream
92c93b4a3646 Fix to be able to compile normal(ish) binaries with --enable-fuzz
Matt Johnston <matt@ucc.asn.au>
parents: 1558
diff changeset
243 */
1456
a90fdd2d2ed8 add fuzzer-preauth_nomaths
Matt Johnston <matt@ucc.asn.au>
parents: 1386
diff changeset
244
1559
92c93b4a3646 Fix to be able to compile normal(ish) binaries with --enable-fuzz
Matt Johnston <matt@ucc.asn.au>
parents: 1558
diff changeset
245 /* be careful to avoid triggering buffer.c assertions */
1456
a90fdd2d2ed8 add fuzzer-preauth_nomaths
Matt Johnston <matt@ucc.asn.au>
parents: 1386
diff changeset
246 if (fuzz.input->len < 8) {
a90fdd2d2ed8 add fuzzer-preauth_nomaths
Matt Johnston <matt@ucc.asn.au>
parents: 1386
diff changeset
247 return 0;
a90fdd2d2ed8 add fuzzer-preauth_nomaths
Matt Johnston <matt@ucc.asn.au>
parents: 1386
diff changeset
248 }
a90fdd2d2ed8 add fuzzer-preauth_nomaths
Matt Johnston <matt@ucc.asn.au>
parents: 1386
diff changeset
249 size_t prefix_size = buf_getint(fuzz.input);
a90fdd2d2ed8 add fuzzer-preauth_nomaths
Matt Johnston <matt@ucc.asn.au>
parents: 1386
diff changeset
250 if (prefix_size != 4) {
a90fdd2d2ed8 add fuzzer-preauth_nomaths
Matt Johnston <matt@ucc.asn.au>
parents: 1386
diff changeset
251 return 0;
a90fdd2d2ed8 add fuzzer-preauth_nomaths
Matt Johnston <matt@ucc.asn.au>
parents: 1386
diff changeset
252 }
a90fdd2d2ed8 add fuzzer-preauth_nomaths
Matt Johnston <matt@ucc.asn.au>
parents: 1386
diff changeset
253 uint32_t wrapseed = buf_getint(fuzz.input);
a90fdd2d2ed8 add fuzzer-preauth_nomaths
Matt Johnston <matt@ucc.asn.au>
parents: 1386
diff changeset
254 wrapfd_setseed(wrapseed);
a90fdd2d2ed8 add fuzzer-preauth_nomaths
Matt Johnston <matt@ucc.asn.au>
parents: 1386
diff changeset
255
1740
dfbe947bdf0d Make wrapfd share a common buffer for all FDs
Matt Johnston <matt@ucc.asn.au>
parents: 1692
diff changeset
256 int fakesock = wrapfd_new();
1456
a90fdd2d2ed8 add fuzzer-preauth_nomaths
Matt Johnston <matt@ucc.asn.au>
parents: 1386
diff changeset
257
a90fdd2d2ed8 add fuzzer-preauth_nomaths
Matt Johnston <matt@ucc.asn.au>
parents: 1386
diff changeset
258 m_malloc_set_epoch(1);
1760
2406a9987810 Add first try at fuzzing custom mutator
Matt Johnston <matt@ucc.asn.au>
parents: 1758
diff changeset
259 fuzz.do_jmp = 1;
1456
a90fdd2d2ed8 add fuzzer-preauth_nomaths
Matt Johnston <matt@ucc.asn.au>
parents: 1386
diff changeset
260 if (setjmp(fuzz.jmp) == 0) {
a90fdd2d2ed8 add fuzzer-preauth_nomaths
Matt Johnston <matt@ucc.asn.au>
parents: 1386
diff changeset
261 svr_session(fakesock, fakesock);
a90fdd2d2ed8 add fuzzer-preauth_nomaths
Matt Johnston <matt@ucc.asn.au>
parents: 1386
diff changeset
262 m_malloc_free_epoch(1, 0);
a90fdd2d2ed8 add fuzzer-preauth_nomaths
Matt Johnston <matt@ucc.asn.au>
parents: 1386
diff changeset
263 } else {
1760
2406a9987810 Add first try at fuzzing custom mutator
Matt Johnston <matt@ucc.asn.au>
parents: 1758
diff changeset
264 fuzz.do_jmp = 0;
1456
a90fdd2d2ed8 add fuzzer-preauth_nomaths
Matt Johnston <matt@ucc.asn.au>
parents: 1386
diff changeset
265 m_malloc_free_epoch(1, 1);
a90fdd2d2ed8 add fuzzer-preauth_nomaths
Matt Johnston <matt@ucc.asn.au>
parents: 1386
diff changeset
266 TRACE(("dropbear_exit longjmped"))
1559
92c93b4a3646 Fix to be able to compile normal(ish) binaries with --enable-fuzz
Matt Johnston <matt@ucc.asn.au>
parents: 1558
diff changeset
267 /* dropbear_exit jumped here */
1456
a90fdd2d2ed8 add fuzzer-preauth_nomaths
Matt Johnston <matt@ucc.asn.au>
parents: 1386
diff changeset
268 }
a90fdd2d2ed8 add fuzzer-preauth_nomaths
Matt Johnston <matt@ucc.asn.au>
parents: 1386
diff changeset
269
a90fdd2d2ed8 add fuzzer-preauth_nomaths
Matt Johnston <matt@ucc.asn.au>
parents: 1386
diff changeset
270 return 0;
a90fdd2d2ed8 add fuzzer-preauth_nomaths
Matt Johnston <matt@ucc.asn.au>
parents: 1386
diff changeset
271 }
1589
35af85194268 Add kexdh and kexecdh fuzzers
Matt Johnston <matt@ucc.asn.au>
parents: 1559
diff changeset
272
1741
d1b279aa5ed1 Get client fuzzer building and starting (fails straight away)
Matt Johnston <matt@ucc.asn.au>
parents: 1740
diff changeset
273 int fuzz_run_client(const uint8_t *Data, size_t Size, int skip_kexmaths) {
d1b279aa5ed1 Get client fuzzer building and starting (fails straight away)
Matt Johnston <matt@ucc.asn.au>
parents: 1740
diff changeset
274 static int once = 0;
d1b279aa5ed1 Get client fuzzer building and starting (fails straight away)
Matt Johnston <matt@ucc.asn.au>
parents: 1740
diff changeset
275 if (!once) {
d1b279aa5ed1 Get client fuzzer building and starting (fails straight away)
Matt Johnston <matt@ucc.asn.au>
parents: 1740
diff changeset
276 fuzz_cli_setup();
d1b279aa5ed1 Get client fuzzer building and starting (fails straight away)
Matt Johnston <matt@ucc.asn.au>
parents: 1740
diff changeset
277 fuzz.skip_kexmaths = skip_kexmaths;
d1b279aa5ed1 Get client fuzzer building and starting (fails straight away)
Matt Johnston <matt@ucc.asn.au>
parents: 1740
diff changeset
278 once = 1;
d1b279aa5ed1 Get client fuzzer building and starting (fails straight away)
Matt Johnston <matt@ucc.asn.au>
parents: 1740
diff changeset
279 }
d1b279aa5ed1 Get client fuzzer building and starting (fails straight away)
Matt Johnston <matt@ucc.asn.au>
parents: 1740
diff changeset
280
d1b279aa5ed1 Get client fuzzer building and starting (fails straight away)
Matt Johnston <matt@ucc.asn.au>
parents: 1740
diff changeset
281 if (fuzz_set_input(Data, Size) == DROPBEAR_FAILURE) {
d1b279aa5ed1 Get client fuzzer building and starting (fails straight away)
Matt Johnston <matt@ucc.asn.au>
parents: 1740
diff changeset
282 return 0;
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283 }
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284
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285 /*
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286 get prefix, allowing for future extensibility. input format is
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287 string prefix
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288 uint32 wrapfd seed
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289 ... to be extended later
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290 [bytes] ssh input stream
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291 */
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292
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293 /* be careful to avoid triggering buffer.c assertions */
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294 if (fuzz.input->len < 8) {
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295 return 0;
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296 }
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297 size_t prefix_size = buf_getint(fuzz.input);
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298 if (prefix_size != 4) {
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299 return 0;
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300 }
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301 uint32_t wrapseed = buf_getint(fuzz.input);
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302 wrapfd_setseed(wrapseed);
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303
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304 int fakesock = wrapfd_new();
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305
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306 m_malloc_set_epoch(1);
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307 fuzz.do_jmp = 1;
1741
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308 if (setjmp(fuzz.jmp) == 0) {
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309 cli_session(fakesock, fakesock, NULL, 0);
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310 m_malloc_free_epoch(1, 0);
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311 } else {
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312 fuzz.do_jmp = 0;
1741
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313 m_malloc_free_epoch(1, 1);
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314 TRACE(("dropbear_exit longjmped"))
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315 /* dropbear_exit jumped here */
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316 }
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317
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318 return 0;
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319 }
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320
1589
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321 const void* fuzz_get_algo(const algo_type *algos, const char* name) {
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322 const algo_type *t;
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323 for (t = algos; t->name; t++) {
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324 if (strcmp(t->name, name) == 0) {
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325 return t->data;
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326 }
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327 }
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328 assert(0);
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329 }
1751
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330
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331 void fuzz_dump(const unsigned char* data, size_t len) {
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332 TRACE(("dump %zu", len))
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333 if (fuzz.dumping) {
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334 assert(atomicio(vwrite, fuzz.recv_dumpfd, (void*)data, len) == len);
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335 }
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336 }