1 | /* ocsp.c
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2 | *
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3 | * Copyright (C) 2006-2015 wolfSSL Inc.
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4 | *
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5 | * This file is part of wolfSSL. (formerly known as CyaSSL)
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6 | *
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7 | * wolfSSL is free software; you can redistribute it and/or modify
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8 | * it under the terms of the GNU General Public License as published by
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9 | * the Free Software Foundation; either version 2 of the License, or
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10 | * (at your option) any later version.
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11 | *
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12 | * wolfSSL is distributed in the hope that it will be useful,
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13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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15 | * GNU General Public License for more details.
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16 | *
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17 | * You should have received a copy of the GNU General Public License
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18 | * along with this program; if not, write to the Free Software
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19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
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20 | */
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21 |
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22 | /* Name change compatibility layer no longer needs to be included here */
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23 |
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24 | #ifdef HAVE_CONFIG_H
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25 | #include <config.h>
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26 | #endif
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27 |
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28 | #include <wolfssl/wolfcrypt/settings.h>
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29 |
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30 | #ifndef WOLFCRYPT_ONLY
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31 | #ifdef HAVE_OCSP
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32 |
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33 | #include <wolfssl/error-ssl.h>
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34 | #include <wolfssl/ocsp.h>
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35 | #include <wolfssl/internal.h>
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36 |
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37 |
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38 | int InitOCSP(WOLFSSL_OCSP* ocsp, WOLFSSL_CERT_MANAGER* cm)
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39 | {
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40 | WOLFSSL_ENTER("InitOCSP");
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41 | XMEMSET(ocsp, 0, sizeof(*ocsp));
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42 | ocsp->cm = cm;
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43 | if (InitMutex(&ocsp->ocspLock) != 0)
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44 | return BAD_MUTEX_E;
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45 |
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46 | return 0;
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47 | }
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48 |
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49 |
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50 | static int InitOCSP_Entry(OCSP_Entry* ocspe, DecodedCert* cert)
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51 | {
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52 | WOLFSSL_ENTER("InitOCSP_Entry");
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53 |
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54 | XMEMSET(ocspe, 0, sizeof(*ocspe));
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55 | XMEMCPY(ocspe->issuerHash, cert->issuerHash, SHA_DIGEST_SIZE);
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56 | XMEMCPY(ocspe->issuerKeyHash, cert->issuerKeyHash, SHA_DIGEST_SIZE);
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57 |
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58 | return 0;
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59 | }
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60 |
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61 |
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62 | static void FreeOCSP_Entry(OCSP_Entry* ocspe)
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63 | {
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64 | CertStatus* tmp = ocspe->status;
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65 |
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66 | WOLFSSL_ENTER("FreeOCSP_Entry");
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67 |
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68 | while (tmp) {
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69 | CertStatus* next = tmp->next;
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70 | XFREE(tmp, NULL, DYNAMIC_TYPE_OCSP_STATUS);
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71 | tmp = next;
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72 | }
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73 | }
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74 |
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75 |
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76 | void FreeOCSP(WOLFSSL_OCSP* ocsp, int dynamic)
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77 | {
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78 | OCSP_Entry* tmp = ocsp->ocspList;
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79 |
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80 | WOLFSSL_ENTER("FreeOCSP");
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81 |
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82 | while (tmp) {
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83 | OCSP_Entry* next = tmp->next;
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84 | FreeOCSP_Entry(tmp);
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85 | XFREE(tmp, NULL, DYNAMIC_TYPE_OCSP_ENTRY);
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86 | tmp = next;
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87 | }
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88 |
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89 | FreeMutex(&ocsp->ocspLock);
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90 | if (dynamic)
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91 | XFREE(ocsp, NULL, DYNAMIC_TYPE_OCSP);
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92 | }
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93 |
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94 |
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95 | static int xstat2err(int stat)
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96 | {
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97 | switch (stat) {
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98 | case CERT_GOOD:
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99 | return 0;
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100 | case CERT_REVOKED:
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101 | return OCSP_CERT_REVOKED;
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102 | default:
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103 | return OCSP_CERT_UNKNOWN;
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104 | }
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105 | }
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106 |
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107 |
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108 | int CheckCertOCSP(WOLFSSL_OCSP* ocsp, DecodedCert* cert)
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109 | {
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110 | byte* ocspReqBuf = NULL;
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111 | int ocspReqSz = 2048;
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112 | byte* ocspRespBuf = NULL;
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113 | int result = -1;
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114 | OCSP_Entry* ocspe;
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115 | CertStatus* certStatus = NULL;
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116 | const char *url;
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117 | int urlSz;
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118 | #ifdef WOLFSSL_SMALL_STACK
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119 | CertStatus* newStatus;
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120 | OcspRequest* ocspRequest;
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121 | OcspResponse* ocspResponse;
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122 | #else
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123 | CertStatus newStatus[1];
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124 | OcspRequest ocspRequest[1];
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125 | OcspResponse ocspResponse[1];
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126 | #endif
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127 |
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128 | WOLFSSL_ENTER("CheckCertOCSP");
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129 |
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130 | if (LockMutex(&ocsp->ocspLock) != 0) {
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131 | WOLFSSL_LEAVE("CheckCertOCSP", BAD_MUTEX_E);
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132 | return BAD_MUTEX_E;
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133 | }
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134 |
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135 | ocspe = ocsp->ocspList;
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136 | while (ocspe) {
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137 | if (XMEMCMP(ocspe->issuerHash, cert->issuerHash, SHA_DIGEST_SIZE) == 0
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138 | && XMEMCMP(ocspe->issuerKeyHash, cert->issuerKeyHash,
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139 | SHA_DIGEST_SIZE) == 0)
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140 | break;
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141 | else
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142 | ocspe = ocspe->next;
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143 | }
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144 |
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145 | if (ocspe == NULL) {
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146 | ocspe = (OCSP_Entry*)XMALLOC(sizeof(OCSP_Entry),
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147 | NULL, DYNAMIC_TYPE_OCSP_ENTRY);
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148 | if (ocspe != NULL) {
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149 | InitOCSP_Entry(ocspe, cert);
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150 | ocspe->next = ocsp->ocspList;
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151 | ocsp->ocspList = ocspe;
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152 | }
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153 | else {
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154 | UnLockMutex(&ocsp->ocspLock);
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155 | WOLFSSL_LEAVE("CheckCertOCSP", MEMORY_ERROR);
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156 | return MEMORY_ERROR;
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157 | }
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158 | }
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159 | else {
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160 | certStatus = ocspe->status;
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161 | while (certStatus) {
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162 | if (certStatus->serialSz == cert->serialSz &&
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163 | XMEMCMP(certStatus->serial, cert->serial, cert->serialSz) == 0)
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164 | break;
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165 | else
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166 | certStatus = certStatus->next;
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167 | }
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168 | }
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169 |
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170 | if (certStatus != NULL) {
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171 | if (!ValidateDate(certStatus->thisDate,
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172 | certStatus->thisDateFormat, BEFORE) ||
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173 | (certStatus->nextDate[0] == 0) ||
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174 | !ValidateDate(certStatus->nextDate,
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175 | certStatus->nextDateFormat, AFTER)) {
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176 | WOLFSSL_MSG("\tinvalid status date, looking up cert");
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177 | }
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178 | else {
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179 | result = xstat2err(certStatus->status);
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180 | UnLockMutex(&ocsp->ocspLock);
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181 | WOLFSSL_LEAVE("CheckCertOCSP", result);
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182 | return result;
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183 | }
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184 | }
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185 |
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186 | UnLockMutex(&ocsp->ocspLock);
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187 |
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188 | if (ocsp->cm->ocspUseOverrideURL) {
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189 | url = ocsp->cm->ocspOverrideURL;
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190 | if (url != NULL && url[0] != '\0')
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191 | urlSz = (int)XSTRLEN(url);
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192 | else
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193 | return OCSP_NEED_URL;
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194 | }
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195 | else if (cert->extAuthInfoSz != 0 && cert->extAuthInfo != NULL) {
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196 | url = (const char *)cert->extAuthInfo;
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197 | urlSz = cert->extAuthInfoSz;
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198 | }
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199 | else {
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200 | /* cert doesn't have extAuthInfo, assuming CERT_GOOD */
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201 | return 0;
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202 | }
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203 |
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204 | ocspReqBuf = (byte*)XMALLOC(ocspReqSz, NULL, DYNAMIC_TYPE_IN_BUFFER);
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205 | if (ocspReqBuf == NULL) {
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206 | WOLFSSL_LEAVE("CheckCertOCSP", MEMORY_ERROR);
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207 | return MEMORY_ERROR;
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208 | }
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209 |
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210 | #ifdef WOLFSSL_SMALL_STACK
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211 | newStatus = (CertStatus*)XMALLOC(sizeof(CertStatus), NULL,
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212 | DYNAMIC_TYPE_TMP_BUFFER);
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213 | ocspRequest = (OcspRequest*)XMALLOC(sizeof(OcspRequest), NULL,
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214 | DYNAMIC_TYPE_TMP_BUFFER);
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215 | ocspResponse = (OcspResponse*)XMALLOC(sizeof(OcspResponse), NULL,
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216 | DYNAMIC_TYPE_TMP_BUFFER);
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217 |
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218 | if (newStatus == NULL || ocspRequest == NULL || ocspResponse == NULL) {
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219 | if (newStatus) XFREE(newStatus, NULL, DYNAMIC_TYPE_TMP_BUFFER);
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220 | if (ocspRequest) XFREE(ocspRequest, NULL, DYNAMIC_TYPE_TMP_BUFFER);
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221 | if (ocspResponse) XFREE(ocspResponse, NULL, DYNAMIC_TYPE_TMP_BUFFER);
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222 |
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223 | XFREE(ocspReqBuf, NULL, DYNAMIC_TYPE_TMP_BUFFER);
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224 |
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225 | WOLFSSL_LEAVE("CheckCertOCSP", MEMORY_ERROR);
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226 | return MEMORY_E;
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227 | }
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228 | #endif
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229 |
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230 | InitOcspRequest(ocspRequest, cert, ocsp->cm->ocspSendNonce,
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231 | ocspReqBuf, ocspReqSz);
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232 | ocspReqSz = EncodeOcspRequest(ocspRequest);
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233 |
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234 | if (ocsp->cm->ocspIOCb)
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235 | result = ocsp->cm->ocspIOCb(ocsp->cm->ocspIOCtx, url, urlSz,
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236 | ocspReqBuf, ocspReqSz, &ocspRespBuf);
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237 |
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238 | if (result >= 0 && ocspRespBuf) {
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239 | XMEMSET(newStatus, 0, sizeof(CertStatus));
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240 |
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241 | InitOcspResponse(ocspResponse, newStatus, ocspRespBuf, result);
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242 | OcspResponseDecode(ocspResponse);
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243 |
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244 | if (ocspResponse->responseStatus != OCSP_SUCCESSFUL)
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245 | result = OCSP_LOOKUP_FAIL;
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246 | else {
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247 | if (CompareOcspReqResp(ocspRequest, ocspResponse) == 0) {
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248 | result = xstat2err(ocspResponse->status->status);
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249 |
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250 | if (LockMutex(&ocsp->ocspLock) != 0)
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251 | result = BAD_MUTEX_E;
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252 | else {
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253 | if (certStatus != NULL)
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254 | /* Replace existing certificate entry with updated */
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255 | XMEMCPY(certStatus, newStatus, sizeof(CertStatus));
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256 | else {
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257 | /* Save new certificate entry */
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258 | certStatus = (CertStatus*)XMALLOC(sizeof(CertStatus),
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259 | NULL, DYNAMIC_TYPE_OCSP_STATUS);
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260 | if (certStatus != NULL) {
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261 | XMEMCPY(certStatus, newStatus, sizeof(CertStatus));
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262 | certStatus->next = ocspe->status;
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263 | ocspe->status = certStatus;
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264 | ocspe->totalStatus++;
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265 | }
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266 | }
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267 |
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268 | UnLockMutex(&ocsp->ocspLock);
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269 | }
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270 | }
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271 | else
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272 | result = OCSP_LOOKUP_FAIL;
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273 | }
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274 | }
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275 | else
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276 | result = OCSP_LOOKUP_FAIL;
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277 |
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278 | XFREE(ocspReqBuf, NULL, DYNAMIC_TYPE_IN_BUFFER);
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279 |
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280 | #ifdef WOLFSSL_SMALL_STACK
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281 | XFREE(newStatus, NULL, DYNAMIC_TYPE_TMP_BUFFER);
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282 | XFREE(ocspRequest, NULL, DYNAMIC_TYPE_TMP_BUFFER);
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283 | XFREE(ocspResponse, NULL, DYNAMIC_TYPE_TMP_BUFFER);
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284 | #endif
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285 |
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286 | if (ocspRespBuf != NULL && ocsp->cm->ocspRespFreeCb)
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287 | ocsp->cm->ocspRespFreeCb(ocsp->cm->ocspIOCtx, ocspRespBuf);
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288 |
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289 | WOLFSSL_LEAVE("CheckCertOCSP", result);
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290 | return result;
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291 | }
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292 |
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293 |
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294 | #else /* HAVE_OCSP */
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295 |
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296 |
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297 | #ifdef _MSC_VER
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298 | /* 4206 warning for blank file */
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299 | #pragma warning(disable: 4206)
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300 | #endif
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301 |
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302 |
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303 | #endif /* HAVE_OCSP */
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304 | #endif /* WOLFCRYPT_ONLY */
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305 |
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