Mercurial > dropbear

annotate fuzz-common.c @ 1373:9891bc31a1b3 fuzz

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fuzzers disable logging by default
author Matt Johnston <matt@ucc.asn.au>
date Thu, 25 May 2017 00:12:07 +0800
parents ddfcadca3c4c
children d4cc85e6c569
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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
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35 // get prefix. input format is
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36 // string prefix
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37 // uint32 wrapfd seed
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38 // ... to be extended later
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39 // [bytes] ssh input stream
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40
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41 // be careful to avoid triggering buffer.c assertions
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42 if (fuzz.input->len < 8) {
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43 return DROPBEAR_FAILURE;
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44 }
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45 size_t prefix_size = buf_getint(fuzz.input);
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46 if (prefix_size != 4) {
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47 return DROPBEAR_FAILURE;
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48 }
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49 uint32_t wrapseed = buf_getint(fuzz.input);
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50 wrapfd_setup(wrapseed);
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51
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52 fuzz_seed();
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53
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54 return DROPBEAR_SUCCESS;
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55 }
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56
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57 static void fuzz_dropbear_log(int UNUSED(priority), const char* format, va_list param) {
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58
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59 char printbuf[1024];
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60
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61 #if DEBUG_TRACE
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62 if (debug_trace) {
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63 vsnprintf(printbuf, sizeof(printbuf), format, param);
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64 fprintf(stderr, "%s\n", printbuf);
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65 }
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66 #endif
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67 }
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68
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69 void svr_setup_fuzzer(void) {
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70 struct passwd *pw;
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71
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72 common_setup_fuzzer();
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73
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74 _dropbear_exit = svr_dropbear_exit;
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75
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76 char *argv[] = {
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77 "-E",
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78 };
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79
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80 int argc = sizeof(argv) / sizeof(*argv);
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81 svr_getopts(argc, argv);
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82
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83 /* user lookups might be slow, cache it */
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84 pw = getpwuid(getuid());
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85 dropbear_assert(pw);
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86 fuzz.pw_name = m_strdup(pw->pw_name);
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87 fuzz.pw_dir = m_strdup(pw->pw_dir);
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88 fuzz.pw_shell = m_strdup(pw->pw_shell);
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89 fuzz.pw_passwd = m_strdup("!!zzznope");
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90
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91 load_fixed_hostkeys();
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92 }
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93
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94 static void load_fixed_hostkeys(void) {
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95 #include "fuzz-hostkeys.c"
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96
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97 buffer *b = buf_new(3000);
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98 enum signkey_type type;
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99
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100 TRACE(("load fixed hostkeys"))
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101
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102 svr_opts.hostkey = new_sign_key();
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103
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104 buf_setlen(b, 0);
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105 buf_putbytes(b, keyr, keyr_len);
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106 buf_setpos(b, 0);
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107 type = DROPBEAR_SIGNKEY_RSA;
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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 rsa hostkey");
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110 }
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111
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112 buf_setlen(b, 0);
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113 buf_putbytes(b, keyd, keyd_len);
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114 buf_setpos(b, 0);
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115 type = DROPBEAR_SIGNKEY_DSS;
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116 if (buf_get_priv_key(b, svr_opts.hostkey, &type) == DROPBEAR_FAILURE) {
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117 dropbear_exit("failed fixed dss hostkey");
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118 }
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119
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120 buf_setlen(b, 0);
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121 buf_putbytes(b, keye, keye_len);
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122 buf_setpos(b, 0);
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123 type = DROPBEAR_SIGNKEY_ECDSA_NISTP256;
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124 if (buf_get_priv_key(b, svr_opts.hostkey, &type) == DROPBEAR_FAILURE) {
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125 dropbear_exit("failed fixed ecdsa hostkey");
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126 }
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127
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128 buf_free(b);
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129 }
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130
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131 void fuzz_kex_fakealgos(void) {
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132 ses.newkeys->recv.crypt_mode = &dropbear_mode_none;
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133 }