Mercurial > dropbear

annotate fuzz-common.c @ 1383:f03cfe9c76ac fuzz

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Disable setnonblocking(), get_socket_address(), set_sock_priority() for fuzzing
author Matt Johnston <matt@ucc.asn.au>
date Fri, 26 May 2017 22:10:51 +0800
parents d4cc85e6c569
children 6c92e97553f1
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 "fuzz-wrapfd.h"
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11
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12 struct dropbear_fuzz_options fuzz;
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13
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14 static void fuzz_dropbear_log(int UNUSED(priority), const char* format, va_list param);
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15 static void load_fixed_hostkeys(void);
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16
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17 void common_setup_fuzzer(void) {
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18 fuzz.fuzzing = 1;
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19 fuzz.wrapfds = 1;
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20 fuzz.input = m_malloc(sizeof(buffer));
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21 _dropbear_log = fuzz_dropbear_log;
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22 crypto_init();
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23 }
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24
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25 int fuzzer_set_input(const uint8_t *Data, size_t Size) {
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26
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27 fuzz.input->data = (unsigned char*)Data;
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28 fuzz.input->size = Size;
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29 fuzz.input->len = Size;
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30 fuzz.input->pos = 0;
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31
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32 memset(&ses, 0x0, sizeof(ses));
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33 memset(&svr_ses, 0x0, sizeof(svr_ses));
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34 wrapfd_setup();
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35
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36 fuzz_seed();
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37
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38 return DROPBEAR_SUCCESS;
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39 }
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40
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41 static void fuzz_dropbear_log(int UNUSED(priority), const char* format, va_list param) {
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42
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43 char printbuf[1024];
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44
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45 #if DEBUG_TRACE
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46 if (debug_trace) {
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47 vsnprintf(printbuf, sizeof(printbuf), format, param);
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48 fprintf(stderr, "%s\n", printbuf);
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49 }
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50 #endif
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51 }
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52
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53 void svr_setup_fuzzer(void) {
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54 struct passwd *pw;
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55
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56 common_setup_fuzzer();
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57
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58 _dropbear_exit = svr_dropbear_exit;
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59
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60 char *argv[] = {
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61 "-E",
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62 };
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63
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64 int argc = sizeof(argv) / sizeof(*argv);
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65 svr_getopts(argc, argv);
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66
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67 /* user lookups might be slow, cache it */
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68 pw = getpwuid(getuid());
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69 dropbear_assert(pw);
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70 fuzz.pw_name = m_strdup(pw->pw_name);
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71 fuzz.pw_dir = m_strdup(pw->pw_dir);
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72 fuzz.pw_shell = m_strdup(pw->pw_shell);
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73 fuzz.pw_passwd = m_strdup("!!zzznope");
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74
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75 load_fixed_hostkeys();
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76 }
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77
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78 static void load_fixed_hostkeys(void) {
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79 #include "fuzz-hostkeys.c"
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80
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81 buffer *b = buf_new(3000);
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82 enum signkey_type type;
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83
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84 TRACE(("load fixed hostkeys"))
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85
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86 svr_opts.hostkey = new_sign_key();
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87
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88 buf_setlen(b, 0);
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89 buf_putbytes(b, keyr, keyr_len);
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90 buf_setpos(b, 0);
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91 type = DROPBEAR_SIGNKEY_RSA;
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92 if (buf_get_priv_key(b, svr_opts.hostkey, &type) == DROPBEAR_FAILURE) {
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93 dropbear_exit("failed fixed rsa hostkey");
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94 }
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95
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96 buf_setlen(b, 0);
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97 buf_putbytes(b, keyd, keyd_len);
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98 buf_setpos(b, 0);
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99 type = DROPBEAR_SIGNKEY_DSS;
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100 if (buf_get_priv_key(b, svr_opts.hostkey, &type) == DROPBEAR_FAILURE) {
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101 dropbear_exit("failed fixed dss hostkey");
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102 }
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103
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104 buf_setlen(b, 0);
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105 buf_putbytes(b, keye, keye_len);
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106 buf_setpos(b, 0);
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107 type = DROPBEAR_SIGNKEY_ECDSA_NISTP256;
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108 if (buf_get_priv_key(b, svr_opts.hostkey, &type) == DROPBEAR_FAILURE) {
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109 dropbear_exit("failed fixed ecdsa hostkey");
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110 }
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111
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112 buf_free(b);
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113 }
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114
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115 void fuzz_kex_fakealgos(void) {
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116 ses.newkeys->recv.crypt_mode = &dropbear_mode_none;
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117 }
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118
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119 void fuzz_get_socket_address(int UNUSED(fd), char **local_host, char **local_port,
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120 char **remote_host, char **remote_port, int UNUSED(host_lookup)) {
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121 if (local_host) {
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122 *local_host = m_strdup("fuzzlocalhost");
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123 }
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124 if (local_port) {
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125 *local_port = m_strdup("1234");
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126 }
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127 if (remote_host) {
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128 *remote_host = m_strdup("fuzzremotehost");
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129 }
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130 if (remote_port) {
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131 *remote_port = m_strdup("9876");
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132 }
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133 }