Mercurial > dropbear

annotate fuzz-common.c @ 1386:f0990c284663 fuzz

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fuzzer-preauth don't call getpwnam(), bring back longjmp
author Matt Johnston <matt@ucc.asn.au>
date Fri, 02 Jun 2017 00:03:51 +0800
parents 6c92e97553f1
children a90fdd2d2ed8
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.do_jmp = 1;
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21 fuzz.input = m_malloc(sizeof(buffer));
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22 _dropbear_log = fuzz_dropbear_log;
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23 crypto_init();
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24 }
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25
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26 int fuzzer_set_input(const uint8_t *Data, size_t Size) {
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27
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28 fuzz.input->data = (unsigned char*)Data;
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29 fuzz.input->size = Size;
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30 fuzz.input->len = Size;
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31 fuzz.input->pos = 0;
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32
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33 memset(&ses, 0x0, sizeof(ses));
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34 memset(&svr_ses, 0x0, sizeof(svr_ses));
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35 wrapfd_setup();
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36
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37 fuzz_seed();
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38
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39 return DROPBEAR_SUCCESS;
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40 }
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41
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42 static void fuzz_dropbear_log(int UNUSED(priority), const char* format, va_list param) {
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43
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44 char printbuf[1024];
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45
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46 #if DEBUG_TRACE
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47 if (debug_trace) {
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48 vsnprintf(printbuf, sizeof(printbuf), format, param);
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49 fprintf(stderr, "%s\n", printbuf);
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50 }
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51 #endif
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52 }
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53
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54 void svr_setup_fuzzer(void) {
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55 struct passwd *pw;
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56
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57 common_setup_fuzzer();
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58
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59 _dropbear_exit = svr_dropbear_exit;
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60
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61 char *argv[] = {
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62 "-E",
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63 };
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64
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65 int argc = sizeof(argv) / sizeof(*argv);
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66 svr_getopts(argc, argv);
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67
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68 /* user lookups might be slow, cache it */
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69 fuzz.pw_name = m_strdup("person");
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70 fuzz.pw_dir = m_strdup("/tmp");
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71 fuzz.pw_shell = m_strdup("/bin/zsh");
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72 fuzz.pw_passwd = m_strdup("!!zzznope");
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73
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74 load_fixed_hostkeys();
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75 }
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76
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77 static void load_fixed_hostkeys(void) {
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78 #include "fuzz-hostkeys.c"
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79
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80 buffer *b = buf_new(3000);
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81 enum signkey_type type;
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82
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83 TRACE(("load fixed hostkeys"))
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84
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85 svr_opts.hostkey = new_sign_key();
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86
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87 buf_setlen(b, 0);
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88 buf_putbytes(b, keyr, keyr_len);
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89 buf_setpos(b, 0);
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90 type = DROPBEAR_SIGNKEY_RSA;
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91 if (buf_get_priv_key(b, svr_opts.hostkey, &type) == DROPBEAR_FAILURE) {
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92 dropbear_exit("failed fixed rsa hostkey");
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93 }
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94
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95 buf_setlen(b, 0);
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96 buf_putbytes(b, keyd, keyd_len);
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97 buf_setpos(b, 0);
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98 type = DROPBEAR_SIGNKEY_DSS;
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99 if (buf_get_priv_key(b, svr_opts.hostkey, &type) == DROPBEAR_FAILURE) {
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100 dropbear_exit("failed fixed dss hostkey");
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101 }
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102
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103 buf_setlen(b, 0);
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104 buf_putbytes(b, keye, keye_len);
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105 buf_setpos(b, 0);
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106 type = DROPBEAR_SIGNKEY_ECDSA_NISTP256;
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107 if (buf_get_priv_key(b, svr_opts.hostkey, &type) == DROPBEAR_FAILURE) {
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108 dropbear_exit("failed fixed ecdsa hostkey");
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109 }
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110
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111 buf_free(b);
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112 }
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113
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114 void fuzz_kex_fakealgos(void) {
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115 ses.newkeys->recv.crypt_mode = &dropbear_mode_none;
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116 }
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117
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118 void fuzz_get_socket_address(int UNUSED(fd), char **local_host, char **local_port,
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119 char **remote_host, char **remote_port, int UNUSED(host_lookup)) {
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120 if (local_host) {
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121 *local_host = m_strdup("fuzzlocalhost");
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122 }
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123 if (local_port) {
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124 *local_port = m_strdup("1234");
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125 }
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126 if (remote_host) {
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127 *remote_host = m_strdup("fuzzremotehost");
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128 }
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129 if (remote_port) {
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130 *remote_port = m_strdup("9876");
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131 }
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132 }