[164] | 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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