annotate fuzz/fuzz-common.c @ 1767:3e1e1f82eba6

Preallocate memory for sshpacketmutator. Add fuzzer-client_mutator_nomaths
author Matt Johnston <matt@ucc.asn.au>
date Mon, 26 Oct 2020 23:31:24 +0800
parents b688c884dad7
children 096a66e45212
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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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 if (getenv("DROPBEAR_KEEP_STDERR")) {
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48 fprintf(stderr, "Dropbear fuzzer: DROPBEAR_KEEP_STDERR, not disabling stderr output\n");
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49 }
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50 else
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51 {
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52 fprintf(stderr, "Dropbear fuzzer: Disabling stderr output\n");
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53 fuzz.stderr = fopen("/dev/null", "w");
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54 assert(fuzz.stderr);
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55 }
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56 }
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57
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58 int fuzz_set_input(const uint8_t *Data, size_t Size) {
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59
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60 fuzz.input->data = (unsigned char*)Data;
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61 fuzz.input->size = Size;
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62 fuzz.input->len = Size;
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63 fuzz.input->pos = 0;
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64
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65 memset(&ses, 0x0, sizeof(ses));
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66 memset(&svr_ses, 0x0, sizeof(svr_ses));
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67 memset(&cli_ses, 0x0, sizeof(cli_ses));
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68 wrapfd_setup(fuzz.input);
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69
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70 fuzz_seed(fuzz.input->data, MIN(fuzz.input->len, 16));
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71
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72 return DROPBEAR_SUCCESS;
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73 }
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74
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75 #if DEBUG_TRACE
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76 static void fuzz_dropbear_log(int UNUSED(priority), const char* format, va_list param) {
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77 if (debug_trace) {
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78 char printbuf[1024];
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79 vsnprintf(printbuf, sizeof(printbuf), format, param);
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80 fprintf(stderr, "%s\n", printbuf);
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81 }
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82 }
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83 #else
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84 static void fuzz_dropbear_log(int UNUSED(priority), const char* UNUSED(format), va_list UNUSED(param)) {
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85 /* No print */
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86 }
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87 #endif /* DEBUG_TRACE */
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88
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89 void fuzz_svr_setup(void) {
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90 fuzz_common_setup();
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91
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92 _dropbear_exit = svr_dropbear_exit;
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93
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94 char *argv[] = {
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95 "dropbear",
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96 "-E",
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97 };
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98
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99 int argc = sizeof(argv) / sizeof(*argv);
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100 svr_getopts(argc, argv);
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101
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102 load_fixed_hostkeys();
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103 }
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104
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105 void fuzz_cli_setup(void) {
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106 fuzz_common_setup();
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107
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108 _dropbear_exit = cli_dropbear_exit;
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109 _dropbear_log = cli_dropbear_log;
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110
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111 char *argv[] = {
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112 "dbclient",
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113 "-y",
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114 "localhost",
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115 "uptime"
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116 };
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117
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118 int argc = sizeof(argv) / sizeof(*argv);
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119 cli_getopts(argc, argv);
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120
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121 load_fixed_client_key();
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122 /* Avoid password prompt */
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123 setenv(DROPBEAR_PASSWORD_ENV, "password", 1);
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124 }
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125
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126 #include "fuzz-hostkeys.c"
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127
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128 static void load_fixed_client_key(void) {
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129
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130 buffer *b = buf_new(3000);
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131 sign_key *key;
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132 enum signkey_type keytype;
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133
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134 key = new_sign_key();
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135 keytype = DROPBEAR_SIGNKEY_ANY;
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136 buf_putbytes(b, keyed25519, keyed25519_len);
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137 buf_setpos(b, 0);
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138 if (buf_get_priv_key(b, key, &keytype) == DROPBEAR_FAILURE) {
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139 dropbear_exit("failed fixed ed25519 hostkey");
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140 }
3b9b427925a0 Load password and key for client fuzzer.
Matt Johnston <matt@ucc.asn.au>
parents: 1742
diff changeset
141 list_append(cli_opts.privkeys, key);
3b9b427925a0 Load password and key for client fuzzer.
Matt Johnston <matt@ucc.asn.au>
parents: 1742
diff changeset
142
3b9b427925a0 Load password and key for client fuzzer.
Matt Johnston <matt@ucc.asn.au>
parents: 1742
diff changeset
143 buf_free(b);
1740
dfbe947bdf0d Make wrapfd share a common buffer for all FDs
Matt Johnston <matt@ucc.asn.au>
parents: 1692
diff changeset
144 }
dfbe947bdf0d Make wrapfd share a common buffer for all FDs
Matt Johnston <matt@ucc.asn.au>
parents: 1692
diff changeset
145
1348
5c2899e35b63 fuzz harness
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
146 static void load_fixed_hostkeys(void) {
5c2899e35b63 fuzz harness
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
147
5c2899e35b63 fuzz harness
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
148 buffer *b = buf_new(3000);
5c2899e35b63 fuzz harness
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
149 enum signkey_type type;
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 TRACE(("load fixed hostkeys"))
5c2899e35b63 fuzz harness
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
152
5c2899e35b63 fuzz harness
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
153 svr_opts.hostkey = new_sign_key();
5c2899e35b63 fuzz harness
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
154
5c2899e35b63 fuzz harness
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
155 buf_setlen(b, 0);
5c2899e35b63 fuzz harness
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
156 buf_putbytes(b, keyr, keyr_len);
5c2899e35b63 fuzz harness
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
157 buf_setpos(b, 0);
5c2899e35b63 fuzz harness
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
158 type = DROPBEAR_SIGNKEY_RSA;
5c2899e35b63 fuzz harness
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
159 if (buf_get_priv_key(b, svr_opts.hostkey, &type) == DROPBEAR_FAILURE) {
5c2899e35b63 fuzz harness
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
160 dropbear_exit("failed fixed rsa hostkey");
5c2899e35b63 fuzz harness
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
161 }
5c2899e35b63 fuzz harness
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
162
5c2899e35b63 fuzz harness
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
163 buf_setlen(b, 0);
5c2899e35b63 fuzz harness
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
164 buf_putbytes(b, keyd, keyd_len);
5c2899e35b63 fuzz harness
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
165 buf_setpos(b, 0);
5c2899e35b63 fuzz harness
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
166 type = DROPBEAR_SIGNKEY_DSS;
5c2899e35b63 fuzz harness
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
167 if (buf_get_priv_key(b, svr_opts.hostkey, &type) == DROPBEAR_FAILURE) {
5c2899e35b63 fuzz harness
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
168 dropbear_exit("failed fixed dss hostkey");
5c2899e35b63 fuzz harness
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
169 }
5c2899e35b63 fuzz harness
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
170
5c2899e35b63 fuzz harness
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
171 buf_setlen(b, 0);
5c2899e35b63 fuzz harness
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
172 buf_putbytes(b, keye, keye_len);
5c2899e35b63 fuzz harness
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
173 buf_setpos(b, 0);
5c2899e35b63 fuzz harness
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
174 type = DROPBEAR_SIGNKEY_ECDSA_NISTP256;
5c2899e35b63 fuzz harness
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
175 if (buf_get_priv_key(b, svr_opts.hostkey, &type) == DROPBEAR_FAILURE) {
5c2899e35b63 fuzz harness
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
176 dropbear_exit("failed fixed ecdsa hostkey");
5c2899e35b63 fuzz harness
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
177 }
5c2899e35b63 fuzz harness
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
178
1659
d32bcb5c557d Add Ed25519 support (#91)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents: 1589
diff changeset
179 buf_setlen(b, 0);
d32bcb5c557d Add Ed25519 support (#91)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents: 1589
diff changeset
180 buf_putbytes(b, keyed25519, keyed25519_len);
d32bcb5c557d Add Ed25519 support (#91)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents: 1589
diff changeset
181 buf_setpos(b, 0);
d32bcb5c557d Add Ed25519 support (#91)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents: 1589
diff changeset
182 type = DROPBEAR_SIGNKEY_ED25519;
d32bcb5c557d Add Ed25519 support (#91)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents: 1589
diff changeset
183 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
184 dropbear_exit("failed fixed ed25519 hostkey");
d32bcb5c557d Add Ed25519 support (#91)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents: 1589
diff changeset
185 }
d32bcb5c557d Add Ed25519 support (#91)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents: 1589
diff changeset
186
1348
5c2899e35b63 fuzz harness
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
187 buf_free(b);
5c2899e35b63 fuzz harness
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
188 }
5c2899e35b63 fuzz harness
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
189
1357
08f4fa4dc6a0 closer to working
Matt Johnston <matt@ucc.asn.au>
parents: 1356
diff changeset
190 void fuzz_kex_fakealgos(void) {
08f4fa4dc6a0 closer to working
Matt Johnston <matt@ucc.asn.au>
parents: 1356
diff changeset
191 ses.newkeys->recv.crypt_mode = &dropbear_mode_none;
08f4fa4dc6a0 closer to working
Matt Johnston <matt@ucc.asn.au>
parents: 1356
diff changeset
192 }
1383
f03cfe9c76ac Disable setnonblocking(), get_socket_address(), set_sock_priority()
Matt Johnston <matt@ucc.asn.au>
parents: 1377
diff changeset
193
f03cfe9c76ac Disable setnonblocking(), get_socket_address(), set_sock_priority()
Matt Johnston <matt@ucc.asn.au>
parents: 1377
diff changeset
194 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
195 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
196 if (local_host) {
f03cfe9c76ac Disable setnonblocking(), get_socket_address(), set_sock_priority()
Matt Johnston <matt@ucc.asn.au>
parents: 1377
diff changeset
197 *local_host = m_strdup("fuzzlocalhost");
f03cfe9c76ac Disable setnonblocking(), get_socket_address(), set_sock_priority()
Matt Johnston <matt@ucc.asn.au>
parents: 1377
diff changeset
198 }
f03cfe9c76ac Disable setnonblocking(), get_socket_address(), set_sock_priority()
Matt Johnston <matt@ucc.asn.au>
parents: 1377
diff changeset
199 if (local_port) {
f03cfe9c76ac Disable setnonblocking(), get_socket_address(), set_sock_priority()
Matt Johnston <matt@ucc.asn.au>
parents: 1377
diff changeset
200 *local_port = m_strdup("1234");
f03cfe9c76ac Disable setnonblocking(), get_socket_address(), set_sock_priority()
Matt Johnston <matt@ucc.asn.au>
parents: 1377
diff changeset
201 }
f03cfe9c76ac Disable setnonblocking(), get_socket_address(), set_sock_priority()
Matt Johnston <matt@ucc.asn.au>
parents: 1377
diff changeset
202 if (remote_host) {
f03cfe9c76ac Disable setnonblocking(), get_socket_address(), set_sock_priority()
Matt Johnston <matt@ucc.asn.au>
parents: 1377
diff changeset
203 *remote_host = m_strdup("fuzzremotehost");
f03cfe9c76ac Disable setnonblocking(), get_socket_address(), set_sock_priority()
Matt Johnston <matt@ucc.asn.au>
parents: 1377
diff changeset
204 }
f03cfe9c76ac Disable setnonblocking(), get_socket_address(), set_sock_priority()
Matt Johnston <matt@ucc.asn.au>
parents: 1377
diff changeset
205 if (remote_port) {
f03cfe9c76ac Disable setnonblocking(), get_socket_address(), set_sock_priority()
Matt Johnston <matt@ucc.asn.au>
parents: 1377
diff changeset
206 *remote_port = m_strdup("9876");
f03cfe9c76ac Disable setnonblocking(), get_socket_address(), set_sock_priority()
Matt Johnston <matt@ucc.asn.au>
parents: 1377
diff changeset
207 }
f03cfe9c76ac Disable setnonblocking(), get_socket_address(), set_sock_priority()
Matt Johnston <matt@ucc.asn.au>
parents: 1377
diff changeset
208 }
1456
a90fdd2d2ed8 add fuzzer-preauth_nomaths
Matt Johnston <matt@ucc.asn.au>
parents: 1386
diff changeset
209
a90fdd2d2ed8 add fuzzer-preauth_nomaths
Matt Johnston <matt@ucc.asn.au>
parents: 1386
diff changeset
210 /* 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
211 void fuzz_fake_send_kexdh_reply(void) {
a90fdd2d2ed8 add fuzzer-preauth_nomaths
Matt Johnston <matt@ucc.asn.au>
parents: 1386
diff changeset
212 assert(!ses.dh_K);
a90fdd2d2ed8 add fuzzer-preauth_nomaths
Matt Johnston <matt@ucc.asn.au>
parents: 1386
diff changeset
213 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
214 mp_set_ul(ses.dh_K, 12345678uL);
1456
a90fdd2d2ed8 add fuzzer-preauth_nomaths
Matt Johnston <matt@ucc.asn.au>
parents: 1386
diff changeset
215 finish_kexhashbuf();
a90fdd2d2ed8 add fuzzer-preauth_nomaths
Matt Johnston <matt@ucc.asn.au>
parents: 1386
diff changeset
216 }
a90fdd2d2ed8 add fuzzer-preauth_nomaths
Matt Johnston <matt@ucc.asn.au>
parents: 1386
diff changeset
217
1740
dfbe947bdf0d Make wrapfd share a common buffer for all FDs
Matt Johnston <matt@ucc.asn.au>
parents: 1692
diff changeset
218 /* 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
219 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
220 *ret_writefd = wrapfd_new();
dfbe947bdf0d Make wrapfd share a common buffer for all FDs
Matt Johnston <matt@ucc.asn.au>
parents: 1692
diff changeset
221 *ret_readfd = wrapfd_new();
dfbe947bdf0d Make wrapfd share a common buffer for all FDs
Matt Johnston <matt@ucc.asn.au>
parents: 1692
diff changeset
222 if (ret_errfd) {
dfbe947bdf0d Make wrapfd share a common buffer for all FDs
Matt Johnston <matt@ucc.asn.au>
parents: 1692
diff changeset
223 *ret_errfd = wrapfd_new();
dfbe947bdf0d Make wrapfd share a common buffer for all FDs
Matt Johnston <matt@ucc.asn.au>
parents: 1692
diff changeset
224 }
1742
6e71440b1e47 Add fuzzer-client_nomaths, fix client fuzzer
Matt Johnston <matt@ucc.asn.au>
parents: 1741
diff changeset
225 *ret_pid = 999;
1740
dfbe947bdf0d Make wrapfd share a common buffer for all FDs
Matt Johnston <matt@ucc.asn.au>
parents: 1692
diff changeset
226 return DROPBEAR_SUCCESS;
dfbe947bdf0d Make wrapfd share a common buffer for all FDs
Matt Johnston <matt@ucc.asn.au>
parents: 1692
diff changeset
227 }
dfbe947bdf0d Make wrapfd share a common buffer for all FDs
Matt Johnston <matt@ucc.asn.au>
parents: 1692
diff changeset
228
1456
a90fdd2d2ed8 add fuzzer-preauth_nomaths
Matt Johnston <matt@ucc.asn.au>
parents: 1386
diff changeset
229 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
230 static int once = 0;
a90fdd2d2ed8 add fuzzer-preauth_nomaths
Matt Johnston <matt@ucc.asn.au>
parents: 1386
diff changeset
231 if (!once) {
a90fdd2d2ed8 add fuzzer-preauth_nomaths
Matt Johnston <matt@ucc.asn.au>
parents: 1386
diff changeset
232 fuzz_svr_setup();
a90fdd2d2ed8 add fuzzer-preauth_nomaths
Matt Johnston <matt@ucc.asn.au>
parents: 1386
diff changeset
233 fuzz.skip_kexmaths = skip_kexmaths;
a90fdd2d2ed8 add fuzzer-preauth_nomaths
Matt Johnston <matt@ucc.asn.au>
parents: 1386
diff changeset
234 once = 1;
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
a90fdd2d2ed8 add fuzzer-preauth_nomaths
Matt Johnston <matt@ucc.asn.au>
parents: 1386
diff changeset
237 if (fuzz_set_input(Data, Size) == DROPBEAR_FAILURE) {
a90fdd2d2ed8 add fuzzer-preauth_nomaths
Matt Johnston <matt@ucc.asn.au>
parents: 1386
diff changeset
238 return 0;
a90fdd2d2ed8 add fuzzer-preauth_nomaths
Matt Johnston <matt@ucc.asn.au>
parents: 1386
diff changeset
239 }
a90fdd2d2ed8 add fuzzer-preauth_nomaths
Matt Johnston <matt@ucc.asn.au>
parents: 1386
diff changeset
240
1559
92c93b4a3646 Fix to be able to compile normal(ish) binaries with --enable-fuzz
Matt Johnston <matt@ucc.asn.au>
parents: 1558
diff changeset
241 /*
1741
d1b279aa5ed1 Get client fuzzer building and starting (fails straight away)
Matt Johnston <matt@ucc.asn.au>
parents: 1740
diff changeset
242 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
243 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
244 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
245 ... 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
246 [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
247 */
1456
a90fdd2d2ed8 add fuzzer-preauth_nomaths
Matt Johnston <matt@ucc.asn.au>
parents: 1386
diff changeset
248
1559
92c93b4a3646 Fix to be able to compile normal(ish) binaries with --enable-fuzz
Matt Johnston <matt@ucc.asn.au>
parents: 1558
diff changeset
249 /* be careful to avoid triggering buffer.c assertions */
1456
a90fdd2d2ed8 add fuzzer-preauth_nomaths
Matt Johnston <matt@ucc.asn.au>
parents: 1386
diff changeset
250 if (fuzz.input->len < 8) {
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 size_t prefix_size = buf_getint(fuzz.input);
a90fdd2d2ed8 add fuzzer-preauth_nomaths
Matt Johnston <matt@ucc.asn.au>
parents: 1386
diff changeset
254 if (prefix_size != 4) {
a90fdd2d2ed8 add fuzzer-preauth_nomaths
Matt Johnston <matt@ucc.asn.au>
parents: 1386
diff changeset
255 return 0;
a90fdd2d2ed8 add fuzzer-preauth_nomaths
Matt Johnston <matt@ucc.asn.au>
parents: 1386
diff changeset
256 }
a90fdd2d2ed8 add fuzzer-preauth_nomaths
Matt Johnston <matt@ucc.asn.au>
parents: 1386
diff changeset
257 uint32_t wrapseed = buf_getint(fuzz.input);
a90fdd2d2ed8 add fuzzer-preauth_nomaths
Matt Johnston <matt@ucc.asn.au>
parents: 1386
diff changeset
258 wrapfd_setseed(wrapseed);
a90fdd2d2ed8 add fuzzer-preauth_nomaths
Matt Johnston <matt@ucc.asn.au>
parents: 1386
diff changeset
259
1740
dfbe947bdf0d Make wrapfd share a common buffer for all FDs
Matt Johnston <matt@ucc.asn.au>
parents: 1692
diff changeset
260 int fakesock = wrapfd_new();
1456
a90fdd2d2ed8 add fuzzer-preauth_nomaths
Matt Johnston <matt@ucc.asn.au>
parents: 1386
diff changeset
261
a90fdd2d2ed8 add fuzzer-preauth_nomaths
Matt Johnston <matt@ucc.asn.au>
parents: 1386
diff changeset
262 m_malloc_set_epoch(1);
1760
2406a9987810 Add first try at fuzzing custom mutator
Matt Johnston <matt@ucc.asn.au>
parents: 1758
diff changeset
263 fuzz.do_jmp = 1;
1456
a90fdd2d2ed8 add fuzzer-preauth_nomaths
Matt Johnston <matt@ucc.asn.au>
parents: 1386
diff changeset
264 if (setjmp(fuzz.jmp) == 0) {
a90fdd2d2ed8 add fuzzer-preauth_nomaths
Matt Johnston <matt@ucc.asn.au>
parents: 1386
diff changeset
265 svr_session(fakesock, fakesock);
a90fdd2d2ed8 add fuzzer-preauth_nomaths
Matt Johnston <matt@ucc.asn.au>
parents: 1386
diff changeset
266 m_malloc_free_epoch(1, 0);
a90fdd2d2ed8 add fuzzer-preauth_nomaths
Matt Johnston <matt@ucc.asn.au>
parents: 1386
diff changeset
267 } else {
1760
2406a9987810 Add first try at fuzzing custom mutator
Matt Johnston <matt@ucc.asn.au>
parents: 1758
diff changeset
268 fuzz.do_jmp = 0;
1456
a90fdd2d2ed8 add fuzzer-preauth_nomaths
Matt Johnston <matt@ucc.asn.au>
parents: 1386
diff changeset
269 m_malloc_free_epoch(1, 1);
a90fdd2d2ed8 add fuzzer-preauth_nomaths
Matt Johnston <matt@ucc.asn.au>
parents: 1386
diff changeset
270 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
271 /* dropbear_exit jumped here */
1456
a90fdd2d2ed8 add fuzzer-preauth_nomaths
Matt Johnston <matt@ucc.asn.au>
parents: 1386
diff changeset
272 }
a90fdd2d2ed8 add fuzzer-preauth_nomaths
Matt Johnston <matt@ucc.asn.au>
parents: 1386
diff changeset
273
a90fdd2d2ed8 add fuzzer-preauth_nomaths
Matt Johnston <matt@ucc.asn.au>
parents: 1386
diff changeset
274 return 0;
a90fdd2d2ed8 add fuzzer-preauth_nomaths
Matt Johnston <matt@ucc.asn.au>
parents: 1386
diff changeset
275 }
1589
35af85194268 Add kexdh and kexecdh fuzzers
Matt Johnston <matt@ucc.asn.au>
parents: 1559
diff changeset
276
1741
d1b279aa5ed1 Get client fuzzer building and starting (fails straight away)
Matt Johnston <matt@ucc.asn.au>
parents: 1740
diff changeset
277 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
278 static int once = 0;
d1b279aa5ed1 Get client fuzzer building and starting (fails straight away)
Matt Johnston <matt@ucc.asn.au>
parents: 1740
diff changeset
279 if (!once) {
d1b279aa5ed1 Get client fuzzer building and starting (fails straight away)
Matt Johnston <matt@ucc.asn.au>
parents: 1740
diff changeset
280 fuzz_cli_setup();
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281 fuzz.skip_kexmaths = skip_kexmaths;
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282 once = 1;
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283 }
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284
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285 if (fuzz_set_input(Data, Size) == DROPBEAR_FAILURE) {
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286 return 0;
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287 }
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288
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289 /*
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290 get prefix, allowing for future extensibility. input format is
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291 string prefix
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292 uint32 wrapfd seed
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293 ... to be extended later
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294 [bytes] ssh input stream
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295 */
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296
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297 /* be careful to avoid triggering buffer.c assertions */
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298 if (fuzz.input->len < 8) {
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299 return 0;
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300 }
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301 size_t prefix_size = buf_getint(fuzz.input);
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302 if (prefix_size != 4) {
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303 return 0;
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304 }
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305 uint32_t wrapseed = buf_getint(fuzz.input);
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306 wrapfd_setseed(wrapseed);
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307
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308 int fakesock = wrapfd_new();
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309
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310 m_malloc_set_epoch(1);
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311 fuzz.do_jmp = 1;
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312 if (setjmp(fuzz.jmp) == 0) {
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313 cli_session(fakesock, fakesock, NULL, 0);
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314 m_malloc_free_epoch(1, 0);
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315 } else {
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316 fuzz.do_jmp = 0;
1741
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317 m_malloc_free_epoch(1, 1);
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318 TRACE(("dropbear_exit longjmped"))
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319 /* dropbear_exit jumped here */
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320 }
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321
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322 return 0;
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323 }
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324
1589
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325 const void* fuzz_get_algo(const algo_type *algos, const char* name) {
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326 const algo_type *t;
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327 for (t = algos; t->name; t++) {
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328 if (strcmp(t->name, name) == 0) {
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329 return t->data;
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330 }
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331 }
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332 assert(0);
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333 }
1751
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334
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335 void fuzz_dump(const unsigned char* data, size_t len) {
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336 TRACE(("dump %zu", len))
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337 if (fuzz.dumping) {
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338 assert(atomicio(vwrite, fuzz.recv_dumpfd, (void*)data, len) == len);
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339 }
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340 }