1 | /*
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2 | * Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
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3 | *
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4 | * Licensed under the OpenSSL license (the "License"). You may not use
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5 | * this file except in compliance with the License. You can obtain a copy
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6 | * in the file LICENSE in the source distribution or at
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7 | * https://www.openssl.org/source/license.html
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8 | */
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9 |
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10 | #include <stdio.h>
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11 | #include <stdlib.h>
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12 | #include <string.h>
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13 | #include "apps.h"
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14 | #include <openssl/bio.h>
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15 | #include <openssl/err.h>
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16 | #include <openssl/x509.h>
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17 | #include <openssl/x509v3.h>
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18 | #include <openssl/pem.h>
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19 |
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20 | static int cb(int ok, X509_STORE_CTX *ctx);
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21 | static int check(X509_STORE *ctx, const char *file,
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22 | STACK_OF(X509) *uchain, STACK_OF(X509) *tchain,
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23 | STACK_OF(X509_CRL) *crls, int show_chain);
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24 | static int v_verbose = 0, vflags = 0;
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25 |
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26 | typedef enum OPTION_choice {
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27 | OPT_ERR = -1, OPT_EOF = 0, OPT_HELP,
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28 | OPT_ENGINE, OPT_CAPATH, OPT_CAFILE, OPT_NOCAPATH, OPT_NOCAFILE,
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29 | OPT_UNTRUSTED, OPT_TRUSTED, OPT_CRLFILE, OPT_CRL_DOWNLOAD, OPT_SHOW_CHAIN,
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30 | OPT_V_ENUM,
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31 | OPT_VERBOSE
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32 | } OPTION_CHOICE;
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33 |
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34 | OPTIONS verify_options[] = {
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35 | {OPT_HELP_STR, 1, '-', "Usage: %s [options] cert.pem...\n"},
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36 | {OPT_HELP_STR, 1, '-', "Valid options are:\n"},
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37 | {"help", OPT_HELP, '-', "Display this summary"},
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38 | {"verbose", OPT_VERBOSE, '-',
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39 | "Print extra information about the operations being performed."},
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40 | {"CApath", OPT_CAPATH, '/', "A directory of trusted certificates"},
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41 | {"CAfile", OPT_CAFILE, '<', "A file of trusted certificates"},
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42 | {"no-CAfile", OPT_NOCAFILE, '-',
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43 | "Do not load the default certificates file"},
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44 | {"no-CApath", OPT_NOCAPATH, '-',
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45 | "Do not load certificates from the default certificates directory"},
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46 | {"untrusted", OPT_UNTRUSTED, '<', "A file of untrusted certificates"},
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47 | {"trusted", OPT_TRUSTED, '<', "A file of trusted certificates"},
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48 | {"CRLfile", OPT_CRLFILE, '<',
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49 | "File containing one or more CRL's (in PEM format) to load"},
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50 | {"crl_download", OPT_CRL_DOWNLOAD, '-',
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51 | "Attempt to download CRL information for this certificate"},
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52 | {"show_chain", OPT_SHOW_CHAIN, '-',
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53 | "Display information about the certificate chain"},
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54 | OPT_V_OPTIONS,
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55 | #ifndef OPENSSL_NO_ENGINE
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56 | {"engine", OPT_ENGINE, 's', "Use engine, possibly a hardware device"},
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57 | #endif
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58 | {NULL}
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59 | };
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60 |
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61 | int verify_main(int argc, char **argv)
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62 | {
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63 | ENGINE *e = NULL;
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64 | STACK_OF(X509) *untrusted = NULL, *trusted = NULL;
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65 | STACK_OF(X509_CRL) *crls = NULL;
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66 | X509_STORE *store = NULL;
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67 | X509_VERIFY_PARAM *vpm = NULL;
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68 | const char *prog, *CApath = NULL, *CAfile = NULL;
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69 | int noCApath = 0, noCAfile = 0;
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70 | int vpmtouched = 0, crl_download = 0, show_chain = 0, i = 0, ret = 1;
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71 | OPTION_CHOICE o;
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72 |
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73 | if ((vpm = X509_VERIFY_PARAM_new()) == NULL)
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74 | goto end;
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75 |
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76 | prog = opt_init(argc, argv, verify_options);
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77 | while ((o = opt_next()) != OPT_EOF) {
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78 | switch (o) {
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79 | case OPT_EOF:
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80 | case OPT_ERR:
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81 | BIO_printf(bio_err, "%s: Use -help for summary.\n", prog);
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82 | goto end;
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83 | case OPT_HELP:
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84 | opt_help(verify_options);
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85 | BIO_printf(bio_err, "Recognized usages:\n");
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86 | for (i = 0; i < X509_PURPOSE_get_count(); i++) {
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87 | X509_PURPOSE *ptmp;
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88 | ptmp = X509_PURPOSE_get0(i);
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89 | BIO_printf(bio_err, "\t%-10s\t%s\n",
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90 | X509_PURPOSE_get0_sname(ptmp),
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91 | X509_PURPOSE_get0_name(ptmp));
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92 | }
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93 |
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94 | BIO_printf(bio_err, "Recognized verify names:\n");
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95 | for (i = 0; i < X509_VERIFY_PARAM_get_count(); i++) {
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96 | const X509_VERIFY_PARAM *vptmp;
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97 | vptmp = X509_VERIFY_PARAM_get0(i);
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98 | BIO_printf(bio_err, "\t%-10s\n",
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99 | X509_VERIFY_PARAM_get0_name(vptmp));
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100 | }
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101 | ret = 0;
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102 | goto end;
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103 | case OPT_V_CASES:
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104 | if (!opt_verify(o, vpm))
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105 | goto end;
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106 | vpmtouched++;
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107 | break;
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108 | case OPT_CAPATH:
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109 | CApath = opt_arg();
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110 | break;
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111 | case OPT_CAFILE:
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112 | CAfile = opt_arg();
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113 | break;
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114 | case OPT_NOCAPATH:
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115 | noCApath = 1;
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116 | break;
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117 | case OPT_NOCAFILE:
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118 | noCAfile = 1;
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119 | break;
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120 | case OPT_UNTRUSTED:
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121 | /* Zero or more times */
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122 | if (!load_certs(opt_arg(), &untrusted, FORMAT_PEM, NULL,
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123 | "untrusted certificates"))
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124 | goto end;
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125 | break;
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126 | case OPT_TRUSTED:
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127 | /* Zero or more times */
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128 | noCAfile = 1;
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129 | noCApath = 1;
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130 | if (!load_certs(opt_arg(), &trusted, FORMAT_PEM, NULL,
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131 | "trusted certificates"))
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132 | goto end;
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133 | break;
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134 | case OPT_CRLFILE:
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135 | /* Zero or more times */
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136 | if (!load_crls(opt_arg(), &crls, FORMAT_PEM, NULL,
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137 | "other CRLs"))
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138 | goto end;
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139 | break;
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140 | case OPT_CRL_DOWNLOAD:
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141 | crl_download = 1;
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142 | break;
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143 | case OPT_ENGINE:
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144 | if ((e = setup_engine(opt_arg(), 0)) == NULL) {
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145 | /* Failure message already displayed */
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146 | goto end;
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147 | }
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148 | break;
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149 | case OPT_SHOW_CHAIN:
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150 | show_chain = 1;
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151 | break;
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152 | case OPT_VERBOSE:
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153 | v_verbose = 1;
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154 | break;
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155 | }
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156 | }
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157 | argc = opt_num_rest();
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158 | argv = opt_rest();
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159 | if (trusted != NULL && (CAfile || CApath)) {
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160 | BIO_printf(bio_err,
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161 | "%s: Cannot use -trusted with -CAfile or -CApath\n",
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162 | prog);
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163 | goto end;
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164 | }
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165 |
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166 | if ((store = setup_verify(CAfile, CApath, noCAfile, noCApath)) == NULL)
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167 | goto end;
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168 | X509_STORE_set_verify_cb(store, cb);
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169 |
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170 | if (vpmtouched)
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171 | X509_STORE_set1_param(store, vpm);
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172 |
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173 | ERR_clear_error();
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174 |
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175 | if (crl_download)
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176 | store_setup_crl_download(store);
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177 |
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178 | ret = 0;
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179 | if (argc < 1) {
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180 | if (check(store, NULL, untrusted, trusted, crls, show_chain) != 1)
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181 | ret = -1;
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182 | } else {
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183 | for (i = 0; i < argc; i++)
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184 | if (check(store, argv[i], untrusted, trusted, crls,
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185 | show_chain) != 1)
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186 | ret = -1;
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187 | }
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188 |
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189 | end:
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190 | X509_VERIFY_PARAM_free(vpm);
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191 | X509_STORE_free(store);
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192 | sk_X509_pop_free(untrusted, X509_free);
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193 | sk_X509_pop_free(trusted, X509_free);
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194 | sk_X509_CRL_pop_free(crls, X509_CRL_free);
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195 | release_engine(e);
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196 | return (ret < 0 ? 2 : ret);
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197 | }
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198 |
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199 | static int check(X509_STORE *ctx, const char *file,
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200 | STACK_OF(X509) *uchain, STACK_OF(X509) *tchain,
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201 | STACK_OF(X509_CRL) *crls, int show_chain)
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202 | {
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203 | X509 *x = NULL;
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204 | int i = 0, ret = 0;
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205 | X509_STORE_CTX *csc;
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206 | STACK_OF(X509) *chain = NULL;
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207 | int num_untrusted;
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208 |
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209 | x = load_cert(file, FORMAT_PEM, "certificate file");
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210 | if (x == NULL)
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211 | goto end;
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212 |
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213 | csc = X509_STORE_CTX_new();
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214 | if (csc == NULL) {
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215 | printf("error %s: X.509 store context allocation failed\n",
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216 | (file == NULL) ? "stdin" : file);
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217 | goto end;
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218 | }
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219 |
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220 | X509_STORE_set_flags(ctx, vflags);
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221 | if (!X509_STORE_CTX_init(csc, ctx, x, uchain)) {
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222 | printf("error %s: X.509 store context initialization failed\n",
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223 | (file == NULL) ? "stdin" : file);
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224 | goto end;
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225 | }
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226 | if (tchain)
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227 | X509_STORE_CTX_set0_trusted_stack(csc, tchain);
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228 | if (crls)
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229 | X509_STORE_CTX_set0_crls(csc, crls);
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230 | i = X509_verify_cert(csc);
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231 | if (i > 0 && X509_STORE_CTX_get_error(csc) == X509_V_OK) {
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232 | printf("%s: OK\n", (file == NULL) ? "stdin" : file);
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233 | ret = 1;
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234 | if (show_chain) {
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235 | int j;
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236 |
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237 | chain = X509_STORE_CTX_get1_chain(csc);
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238 | num_untrusted = X509_STORE_CTX_get_num_untrusted(csc);
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239 | printf("Chain:\n");
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240 | for (j = 0; j < sk_X509_num(chain); j++) {
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241 | X509 *cert = sk_X509_value(chain, j);
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242 | printf("depth=%d: ", j);
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243 | X509_NAME_print_ex_fp(stdout,
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244 | X509_get_subject_name(cert),
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245 | 0, XN_FLAG_ONELINE);
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246 | if (j < num_untrusted)
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247 | printf(" (untrusted)");
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248 | printf("\n");
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249 | }
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250 | sk_X509_pop_free(chain, X509_free);
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251 | }
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252 | } else {
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253 | printf("error %s: verification failed\n", (file == NULL) ? "stdin" : file);
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254 | }
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255 | X509_STORE_CTX_free(csc);
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256 |
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257 | end:
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258 | if (i <= 0)
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259 | ERR_print_errors(bio_err);
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260 | X509_free(x);
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261 |
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262 | return ret;
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263 | }
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264 |
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265 | static int cb(int ok, X509_STORE_CTX *ctx)
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266 | {
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267 | int cert_error = X509_STORE_CTX_get_error(ctx);
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268 | X509 *current_cert = X509_STORE_CTX_get_current_cert(ctx);
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269 |
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270 | if (!ok) {
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271 | if (current_cert) {
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272 | X509_NAME_print_ex(bio_err,
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273 | X509_get_subject_name(current_cert),
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274 | 0, XN_FLAG_ONELINE);
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275 | BIO_printf(bio_err, "\n");
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276 | }
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277 | BIO_printf(bio_err, "%serror %d at %d depth lookup: %s\n",
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278 | X509_STORE_CTX_get0_parent_ctx(ctx) ? "[CRL path] " : "",
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279 | cert_error,
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280 | X509_STORE_CTX_get_error_depth(ctx),
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281 | X509_verify_cert_error_string(cert_error));
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282 | switch (cert_error) {
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283 | case X509_V_ERR_NO_EXPLICIT_POLICY:
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284 | policies_print(ctx);
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285 | case X509_V_ERR_CERT_HAS_EXPIRED:
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286 |
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287 | /*
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288 | * since we are just checking the certificates, it is ok if they
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289 | * are self signed. But we should still warn the user.
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290 | */
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291 | case X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT:
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292 | /* Continue after extension errors too */
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293 | case X509_V_ERR_INVALID_CA:
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294 | case X509_V_ERR_INVALID_NON_CA:
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295 | case X509_V_ERR_PATH_LENGTH_EXCEEDED:
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296 | case X509_V_ERR_INVALID_PURPOSE:
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297 | case X509_V_ERR_CRL_HAS_EXPIRED:
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298 | case X509_V_ERR_CRL_NOT_YET_VALID:
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299 | case X509_V_ERR_UNHANDLED_CRITICAL_EXTENSION:
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300 | ok = 1;
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301 | }
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302 |
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303 | return ok;
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304 |
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305 | }
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306 | if (cert_error == X509_V_OK && ok == 2)
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307 | policies_print(ctx);
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308 | if (!v_verbose)
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309 | ERR_clear_error();
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310 | return (ok);
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311 | }
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