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737 lines
24 KiB
737 lines
24 KiB
/* crypto/ts/ts_resp_verify.c */ |
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/* |
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* Written by Zoltan Glozik (zglozik@stones.com) for the OpenSSL project |
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* 2002. |
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*/ |
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/* ==================================================================== |
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* Copyright (c) 2006 The OpenSSL Project. All rights reserved. |
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions |
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* are met: |
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* |
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* 1. Redistributions of source code must retain the above copyright |
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* notice, this list of conditions and the following disclaimer. |
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* |
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* 2. Redistributions in binary form must reproduce the above copyright |
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* notice, this list of conditions and the following disclaimer in |
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* the documentation and/or other materials provided with the |
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* distribution. |
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* |
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* 3. All advertising materials mentioning features or use of this |
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* software must display the following acknowledgment: |
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* "This product includes software developed by the OpenSSL Project |
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* for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)" |
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* |
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* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to |
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* endorse or promote products derived from this software without |
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* prior written permission. For written permission, please contact |
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* licensing@OpenSSL.org. |
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* |
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* 5. Products derived from this software may not be called "OpenSSL" |
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* nor may "OpenSSL" appear in their names without prior written |
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* permission of the OpenSSL Project. |
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* |
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* 6. Redistributions of any form whatsoever must retain the following |
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* acknowledgment: |
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* "This product includes software developed by the OpenSSL Project |
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* for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)" |
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* |
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* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY |
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* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR |
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* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, |
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED |
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* OF THE POSSIBILITY OF SUCH DAMAGE. |
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* ==================================================================== |
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* |
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* This product includes cryptographic software written by Eric Young |
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* (eay@cryptsoft.com). This product includes software written by Tim |
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* Hudson (tjh@cryptsoft.com). |
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* |
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*/ |
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|
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#include <stdio.h> |
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#include "cryptlib.h" |
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#include <openssl/objects.h> |
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#include <openssl/ts.h> |
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#include <openssl/pkcs7.h> |
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|
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/* Private function declarations. */ |
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|
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static int TS_verify_cert(X509_STORE *store, STACK_OF(X509) *untrusted, |
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X509 *signer, STACK_OF(X509) **chain); |
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static int TS_check_signing_certs(PKCS7_SIGNER_INFO *si, |
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STACK_OF(X509) *chain); |
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static ESS_SIGNING_CERT *ESS_get_signing_cert(PKCS7_SIGNER_INFO *si); |
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static int TS_find_cert(STACK_OF(ESS_CERT_ID) *cert_ids, X509 *cert); |
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static int TS_issuer_serial_cmp(ESS_ISSUER_SERIAL *is, X509_CINF *cinfo); |
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static int int_TS_RESP_verify_token(TS_VERIFY_CTX *ctx, |
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PKCS7 *token, TS_TST_INFO *tst_info); |
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static int TS_check_status_info(TS_RESP *response); |
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static char *TS_get_status_text(STACK_OF(ASN1_UTF8STRING) *text); |
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static int TS_check_policy(ASN1_OBJECT *req_oid, TS_TST_INFO *tst_info); |
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static int TS_compute_imprint(BIO *data, TS_TST_INFO *tst_info, |
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X509_ALGOR **md_alg, |
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unsigned char **imprint, unsigned *imprint_len); |
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static int TS_check_imprints(X509_ALGOR *algor_a, |
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unsigned char *imprint_a, unsigned len_a, |
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TS_TST_INFO *tst_info); |
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static int TS_check_nonces(const ASN1_INTEGER *a, TS_TST_INFO *tst_info); |
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static int TS_check_signer_name(GENERAL_NAME *tsa_name, X509 *signer); |
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static int TS_find_name(STACK_OF(GENERAL_NAME) *gen_names, |
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GENERAL_NAME *name); |
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|
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/* |
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* Local mapping between response codes and descriptions. |
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* Don't forget to change TS_STATUS_BUF_SIZE when modifying |
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* the elements of this array. |
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*/ |
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static const char *TS_status_text[] = { "granted", |
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"grantedWithMods", |
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"rejection", |
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"waiting", |
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"revocationWarning", |
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"revocationNotification" |
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}; |
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#define TS_STATUS_TEXT_SIZE (sizeof(TS_status_text)/sizeof(*TS_status_text)) |
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|
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/* |
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* This must be greater or equal to the sum of the strings in TS_status_text |
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* plus the number of its elements. |
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*/ |
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#define TS_STATUS_BUF_SIZE 256 |
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|
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static struct { |
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int code; |
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const char *text; |
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} TS_failure_info[] = { |
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{ |
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TS_INFO_BAD_ALG, "badAlg" |
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}, |
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{ |
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TS_INFO_BAD_REQUEST, "badRequest" |
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}, |
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{ |
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TS_INFO_BAD_DATA_FORMAT, "badDataFormat" |
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}, |
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{ |
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TS_INFO_TIME_NOT_AVAILABLE, "timeNotAvailable" |
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}, |
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{ |
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TS_INFO_UNACCEPTED_POLICY, "unacceptedPolicy" |
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}, |
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{ |
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TS_INFO_UNACCEPTED_EXTENSION, "unacceptedExtension" |
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}, |
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{ |
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TS_INFO_ADD_INFO_NOT_AVAILABLE, "addInfoNotAvailable" |
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}, |
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{ |
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TS_INFO_SYSTEM_FAILURE, "systemFailure" |
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} |
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}; |
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#define TS_FAILURE_INFO_SIZE (sizeof(TS_failure_info) / \ |
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sizeof(*TS_failure_info)) |
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|
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/* Functions for verifying a signed TS_TST_INFO structure. */ |
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|
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/*- |
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* This function carries out the following tasks: |
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* - Checks if there is one and only one signer. |
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* - Search for the signing certificate in 'certs' and in the response. |
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* - Check the extended key usage and key usage fields of the signer |
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* certificate (done by the path validation). |
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* - Build and validate the certificate path. |
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* - Check if the certificate path meets the requirements of the |
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* SigningCertificate ESS signed attribute. |
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* - Verify the signature value. |
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* - Returns the signer certificate in 'signer', if 'signer' is not NULL. |
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*/ |
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int TS_RESP_verify_signature(PKCS7 *token, STACK_OF(X509) *certs, |
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X509_STORE *store, X509 **signer_out) |
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{ |
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STACK_OF(PKCS7_SIGNER_INFO) *sinfos = NULL; |
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PKCS7_SIGNER_INFO *si; |
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STACK_OF(X509) *signers = NULL; |
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X509 *signer; |
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STACK_OF(X509) *chain = NULL; |
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char buf[4096]; |
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int i, j = 0, ret = 0; |
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BIO *p7bio = NULL; |
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|
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/* Some sanity checks first. */ |
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if (!token) { |
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TSerr(TS_F_TS_RESP_VERIFY_SIGNATURE, TS_R_INVALID_NULL_POINTER); |
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goto err; |
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} |
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/* Check for the correct content type */ |
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if (!PKCS7_type_is_signed(token)) { |
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TSerr(TS_F_TS_RESP_VERIFY_SIGNATURE, TS_R_WRONG_CONTENT_TYPE); |
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goto err; |
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} |
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/* Check if there is one and only one signer. */ |
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sinfos = PKCS7_get_signer_info(token); |
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if (!sinfos || sk_PKCS7_SIGNER_INFO_num(sinfos) != 1) { |
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TSerr(TS_F_TS_RESP_VERIFY_SIGNATURE, TS_R_THERE_MUST_BE_ONE_SIGNER); |
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goto err; |
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} |
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si = sk_PKCS7_SIGNER_INFO_value(sinfos, 0); |
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|
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/* Check for no content: no data to verify signature. */ |
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if (PKCS7_get_detached(token)) { |
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TSerr(TS_F_TS_RESP_VERIFY_SIGNATURE, TS_R_NO_CONTENT); |
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goto err; |
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} |
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/* |
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* Get hold of the signer certificate, search only internal certificates |
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* if it was requested. |
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*/ |
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signers = PKCS7_get0_signers(token, certs, 0); |
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if (!signers || sk_X509_num(signers) != 1) |
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goto err; |
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signer = sk_X509_value(signers, 0); |
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|
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/* Now verify the certificate. */ |
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if (!TS_verify_cert(store, certs, signer, &chain)) |
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goto err; |
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/* |
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* Check if the signer certificate is consistent with the ESS extension. |
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*/ |
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if (!TS_check_signing_certs(si, chain)) |
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goto err; |
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/* Creating the message digest. */ |
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p7bio = PKCS7_dataInit(token, NULL); |
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|
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/* We now have to 'read' from p7bio to calculate digests etc. */ |
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while ((i = BIO_read(p7bio, buf, sizeof(buf))) > 0) ; |
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/* Verifying the signature. */ |
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j = PKCS7_signatureVerify(p7bio, token, si, signer); |
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if (j <= 0) { |
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TSerr(TS_F_TS_RESP_VERIFY_SIGNATURE, TS_R_SIGNATURE_FAILURE); |
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goto err; |
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} |
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/* Return the signer certificate if needed. */ |
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if (signer_out) { |
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*signer_out = signer; |
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CRYPTO_add(&signer->references, 1, CRYPTO_LOCK_X509); |
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} |
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ret = 1; |
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err: |
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BIO_free_all(p7bio); |
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sk_X509_pop_free(chain, X509_free); |
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sk_X509_free(signers); |
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return ret; |
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} |
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/* |
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* The certificate chain is returned in chain. Caller is responsible for |
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* freeing the vector. |
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*/ |
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static int TS_verify_cert(X509_STORE *store, STACK_OF(X509) *untrusted, |
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X509 *signer, STACK_OF(X509) **chain) |
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{ |
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X509_STORE_CTX cert_ctx; |
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int i; |
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int ret = 1; |
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/* chain is an out argument. */ |
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*chain = NULL; |
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if (!X509_STORE_CTX_init(&cert_ctx, store, signer, untrusted)) |
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return 0; |
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X509_STORE_CTX_set_purpose(&cert_ctx, X509_PURPOSE_TIMESTAMP_SIGN); |
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i = X509_verify_cert(&cert_ctx); |
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if (i <= 0) { |
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int j = X509_STORE_CTX_get_error(&cert_ctx); |
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TSerr(TS_F_TS_VERIFY_CERT, TS_R_CERTIFICATE_VERIFY_ERROR); |
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ERR_add_error_data(2, "Verify error:", |
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X509_verify_cert_error_string(j)); |
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ret = 0; |
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} else { |
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/* Get a copy of the certificate chain. */ |
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*chain = X509_STORE_CTX_get1_chain(&cert_ctx); |
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} |
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X509_STORE_CTX_cleanup(&cert_ctx); |
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return ret; |
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} |
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static int TS_check_signing_certs(PKCS7_SIGNER_INFO *si, |
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STACK_OF(X509) *chain) |
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{ |
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ESS_SIGNING_CERT *ss = ESS_get_signing_cert(si); |
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STACK_OF(ESS_CERT_ID) *cert_ids = NULL; |
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X509 *cert; |
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int i = 0; |
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int ret = 0; |
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if (!ss) |
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goto err; |
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cert_ids = ss->cert_ids; |
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/* The signer certificate must be the first in cert_ids. */ |
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cert = sk_X509_value(chain, 0); |
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if (TS_find_cert(cert_ids, cert) != 0) |
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goto err; |
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/* |
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* Check the other certificates of the chain if there are more than one |
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* certificate ids in cert_ids. |
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*/ |
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if (sk_ESS_CERT_ID_num(cert_ids) > 1) { |
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/* All the certificates of the chain must be in cert_ids. */ |
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for (i = 1; i < sk_X509_num(chain); ++i) { |
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cert = sk_X509_value(chain, i); |
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if (TS_find_cert(cert_ids, cert) < 0) |
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goto err; |
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} |
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} |
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ret = 1; |
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err: |
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if (!ret) |
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TSerr(TS_F_TS_CHECK_SIGNING_CERTS, |
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TS_R_ESS_SIGNING_CERTIFICATE_ERROR); |
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ESS_SIGNING_CERT_free(ss); |
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return ret; |
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} |
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static ESS_SIGNING_CERT *ESS_get_signing_cert(PKCS7_SIGNER_INFO *si) |
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{ |
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ASN1_TYPE *attr; |
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const unsigned char *p; |
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attr = PKCS7_get_signed_attribute(si, NID_id_smime_aa_signingCertificate); |
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if (!attr) |
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return NULL; |
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p = attr->value.sequence->data; |
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return d2i_ESS_SIGNING_CERT(NULL, &p, attr->value.sequence->length); |
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} |
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|
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/* Returns < 0 if certificate is not found, certificate index otherwise. */ |
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static int TS_find_cert(STACK_OF(ESS_CERT_ID) *cert_ids, X509 *cert) |
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{ |
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int i; |
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|
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if (!cert_ids || !cert) |
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return -1; |
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|
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/* Recompute SHA1 hash of certificate if necessary (side effect). */ |
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X509_check_purpose(cert, -1, 0); |
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|
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/* Look for cert in the cert_ids vector. */ |
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for (i = 0; i < sk_ESS_CERT_ID_num(cert_ids); ++i) { |
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ESS_CERT_ID *cid = sk_ESS_CERT_ID_value(cert_ids, i); |
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|
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/* Check the SHA-1 hash first. */ |
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if (cid->hash->length == sizeof(cert->sha1_hash) |
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&& !memcmp(cid->hash->data, cert->sha1_hash, |
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sizeof(cert->sha1_hash))) { |
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/* Check the issuer/serial as well if specified. */ |
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ESS_ISSUER_SERIAL *is = cid->issuer_serial; |
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if (!is || !TS_issuer_serial_cmp(is, cert->cert_info)) |
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return i; |
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} |
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} |
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|
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return -1; |
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} |
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|
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static int TS_issuer_serial_cmp(ESS_ISSUER_SERIAL *is, X509_CINF *cinfo) |
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{ |
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GENERAL_NAME *issuer; |
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|
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if (!is || !cinfo || sk_GENERAL_NAME_num(is->issuer) != 1) |
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return -1; |
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|
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/* Check the issuer first. It must be a directory name. */ |
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issuer = sk_GENERAL_NAME_value(is->issuer, 0); |
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if (issuer->type != GEN_DIRNAME |
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|| X509_NAME_cmp(issuer->d.dirn, cinfo->issuer)) |
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return -1; |
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|
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/* Check the serial number, too. */ |
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if (ASN1_INTEGER_cmp(is->serial, cinfo->serialNumber)) |
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return -1; |
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|
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return 0; |
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} |
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|
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/*- |
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* Verifies whether 'response' contains a valid response with regards |
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* to the settings of the context: |
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* - Gives an error message if the TS_TST_INFO is not present. |
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* - Calls _TS_RESP_verify_token to verify the token content. |
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*/ |
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int TS_RESP_verify_response(TS_VERIFY_CTX *ctx, TS_RESP *response) |
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{ |
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PKCS7 *token = TS_RESP_get_token(response); |
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TS_TST_INFO *tst_info = TS_RESP_get_tst_info(response); |
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int ret = 0; |
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|
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/* Check if we have a successful TS_TST_INFO object in place. */ |
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if (!TS_check_status_info(response)) |
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goto err; |
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|
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/* Check the contents of the time stamp token. */ |
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if (!int_TS_RESP_verify_token(ctx, token, tst_info)) |
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goto err; |
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ret = 1; |
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err: |
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return ret; |
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} |
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|
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/* |
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* Tries to extract a TS_TST_INFO structure from the PKCS7 token and |
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* calls the internal int_TS_RESP_verify_token function for verifying it. |
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*/ |
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int TS_RESP_verify_token(TS_VERIFY_CTX *ctx, PKCS7 *token) |
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{ |
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TS_TST_INFO *tst_info = PKCS7_to_TS_TST_INFO(token); |
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int ret = 0; |
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if (tst_info) { |
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ret = int_TS_RESP_verify_token(ctx, token, tst_info); |
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TS_TST_INFO_free(tst_info); |
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} |
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return ret; |
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} |
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|
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/*- |
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* Verifies whether the 'token' contains a valid time stamp token |
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* with regards to the settings of the context. Only those checks are |
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* carried out that are specified in the context: |
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* - Verifies the signature of the TS_TST_INFO. |
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* - Checks the version number of the response. |
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* - Check if the requested and returned policies math. |
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* - Check if the message imprints are the same. |
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* - Check if the nonces are the same. |
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* - Check if the TSA name matches the signer. |
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* - Check if the TSA name is the expected TSA. |
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*/ |
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static int int_TS_RESP_verify_token(TS_VERIFY_CTX *ctx, |
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PKCS7 *token, TS_TST_INFO *tst_info) |
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{ |
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X509 *signer = NULL; |
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GENERAL_NAME *tsa_name = TS_TST_INFO_get_tsa(tst_info); |
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X509_ALGOR *md_alg = NULL; |
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unsigned char *imprint = NULL; |
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unsigned imprint_len = 0; |
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int ret = 0; |
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|
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/* Verify the signature. */ |
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if ((ctx->flags & TS_VFY_SIGNATURE) |
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&& !TS_RESP_verify_signature(token, ctx->certs, ctx->store, &signer)) |
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goto err; |
|
|
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/* Check version number of response. */ |
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if ((ctx->flags & TS_VFY_VERSION) |
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&& TS_TST_INFO_get_version(tst_info) != 1) { |
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TSerr(TS_F_INT_TS_RESP_VERIFY_TOKEN, TS_R_UNSUPPORTED_VERSION); |
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goto err; |
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} |
|
|
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/* Check policies. */ |
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if ((ctx->flags & TS_VFY_POLICY) |
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&& !TS_check_policy(ctx->policy, tst_info)) |
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goto err; |
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|
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/* Check message imprints. */ |
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if ((ctx->flags & TS_VFY_IMPRINT) |
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&& !TS_check_imprints(ctx->md_alg, ctx->imprint, ctx->imprint_len, |
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tst_info)) |
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goto err; |
|
|
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/* Compute and check message imprints. */ |
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if ((ctx->flags & TS_VFY_DATA) |
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&& (!TS_compute_imprint(ctx->data, tst_info, |
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&md_alg, &imprint, &imprint_len) |
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|| !TS_check_imprints(md_alg, imprint, imprint_len, tst_info))) |
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goto err; |
|
|
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/* Check nonces. */ |
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if ((ctx->flags & TS_VFY_NONCE) |
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&& !TS_check_nonces(ctx->nonce, tst_info)) |
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goto err; |
|
|
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/* Check whether TSA name and signer certificate match. */ |
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if ((ctx->flags & TS_VFY_SIGNER) |
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&& tsa_name && !TS_check_signer_name(tsa_name, signer)) { |
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TSerr(TS_F_INT_TS_RESP_VERIFY_TOKEN, TS_R_TSA_NAME_MISMATCH); |
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goto err; |
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} |
|
|
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/* Check whether the TSA is the expected one. */ |
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if ((ctx->flags & TS_VFY_TSA_NAME) |
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&& !TS_check_signer_name(ctx->tsa_name, signer)) { |
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TSerr(TS_F_INT_TS_RESP_VERIFY_TOKEN, TS_R_TSA_UNTRUSTED); |
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goto err; |
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} |
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|
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ret = 1; |
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err: |
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X509_free(signer); |
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X509_ALGOR_free(md_alg); |
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OPENSSL_free(imprint); |
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return ret; |
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} |
|
|
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static int TS_check_status_info(TS_RESP *response) |
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{ |
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TS_STATUS_INFO *info = TS_RESP_get_status_info(response); |
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long status = ASN1_INTEGER_get(info->status); |
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const char *status_text = NULL; |
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char *embedded_status_text = NULL; |
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char failure_text[TS_STATUS_BUF_SIZE] = ""; |
|
|
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/* Check if everything went fine. */ |
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if (status == 0 || status == 1) |
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return 1; |
|
|
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/* There was an error, get the description in status_text. */ |
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if (0 <= status && status < (long)TS_STATUS_TEXT_SIZE) |
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status_text = TS_status_text[status]; |
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else |
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status_text = "unknown code"; |
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|
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/* Set the embedded_status_text to the returned description. */ |
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if (sk_ASN1_UTF8STRING_num(info->text) > 0 |
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&& !(embedded_status_text = TS_get_status_text(info->text))) |
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return 0; |
|
|
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/* Filling in failure_text with the failure information. */ |
|
if (info->failure_info) { |
|
int i; |
|
int first = 1; |
|
for (i = 0; i < (int)TS_FAILURE_INFO_SIZE; ++i) { |
|
if (ASN1_BIT_STRING_get_bit(info->failure_info, |
|
TS_failure_info[i].code)) { |
|
if (!first) |
|
strcat(failure_text, ","); |
|
else |
|
first = 0; |
|
strcat(failure_text, TS_failure_info[i].text); |
|
} |
|
} |
|
} |
|
if (failure_text[0] == '\0') |
|
strcpy(failure_text, "unspecified"); |
|
|
|
/* Making up the error string. */ |
|
TSerr(TS_F_TS_CHECK_STATUS_INFO, TS_R_NO_TIME_STAMP_TOKEN); |
|
ERR_add_error_data(6, |
|
"status code: ", status_text, |
|
", status text: ", embedded_status_text ? |
|
embedded_status_text : "unspecified", |
|
", failure codes: ", failure_text); |
|
OPENSSL_free(embedded_status_text); |
|
|
|
return 0; |
|
} |
|
|
|
static char *TS_get_status_text(STACK_OF(ASN1_UTF8STRING) *text) |
|
{ |
|
int i; |
|
unsigned int length = 0; |
|
char *result = NULL; |
|
char *p; |
|
|
|
/* Determine length first. */ |
|
for (i = 0; i < sk_ASN1_UTF8STRING_num(text); ++i) { |
|
ASN1_UTF8STRING *current = sk_ASN1_UTF8STRING_value(text, i); |
|
length += ASN1_STRING_length(current); |
|
length += 1; /* separator character */ |
|
} |
|
/* Allocate memory (closing '\0' included). */ |
|
if (!(result = OPENSSL_malloc(length))) { |
|
TSerr(TS_F_TS_GET_STATUS_TEXT, ERR_R_MALLOC_FAILURE); |
|
return NULL; |
|
} |
|
/* Concatenate the descriptions. */ |
|
for (i = 0, p = result; i < sk_ASN1_UTF8STRING_num(text); ++i) { |
|
ASN1_UTF8STRING *current = sk_ASN1_UTF8STRING_value(text, i); |
|
length = ASN1_STRING_length(current); |
|
if (i > 0) |
|
*p++ = '/'; |
|
strncpy(p, (const char *)ASN1_STRING_data(current), length); |
|
p += length; |
|
} |
|
/* We do have space for this, too. */ |
|
*p = '\0'; |
|
|
|
return result; |
|
} |
|
|
|
static int TS_check_policy(ASN1_OBJECT *req_oid, TS_TST_INFO *tst_info) |
|
{ |
|
ASN1_OBJECT *resp_oid = TS_TST_INFO_get_policy_id(tst_info); |
|
|
|
if (OBJ_cmp(req_oid, resp_oid) != 0) { |
|
TSerr(TS_F_TS_CHECK_POLICY, TS_R_POLICY_MISMATCH); |
|
return 0; |
|
} |
|
|
|
return 1; |
|
} |
|
|
|
static int TS_compute_imprint(BIO *data, TS_TST_INFO *tst_info, |
|
X509_ALGOR **md_alg, |
|
unsigned char **imprint, unsigned *imprint_len) |
|
{ |
|
TS_MSG_IMPRINT *msg_imprint = TS_TST_INFO_get_msg_imprint(tst_info); |
|
X509_ALGOR *md_alg_resp = TS_MSG_IMPRINT_get_algo(msg_imprint); |
|
const EVP_MD *md; |
|
EVP_MD_CTX md_ctx; |
|
unsigned char buffer[4096]; |
|
int length; |
|
|
|
*md_alg = NULL; |
|
*imprint = NULL; |
|
|
|
/* Return the MD algorithm of the response. */ |
|
if (!(*md_alg = X509_ALGOR_dup(md_alg_resp))) |
|
goto err; |
|
|
|
/* Getting the MD object. */ |
|
if (!(md = EVP_get_digestbyobj((*md_alg)->algorithm))) { |
|
TSerr(TS_F_TS_COMPUTE_IMPRINT, TS_R_UNSUPPORTED_MD_ALGORITHM); |
|
goto err; |
|
} |
|
|
|
/* Compute message digest. */ |
|
length = EVP_MD_size(md); |
|
if (length < 0) |
|
goto err; |
|
*imprint_len = length; |
|
if (!(*imprint = OPENSSL_malloc(*imprint_len))) { |
|
TSerr(TS_F_TS_COMPUTE_IMPRINT, ERR_R_MALLOC_FAILURE); |
|
goto err; |
|
} |
|
|
|
if (!EVP_DigestInit(&md_ctx, md)) |
|
goto err; |
|
while ((length = BIO_read(data, buffer, sizeof(buffer))) > 0) { |
|
if (!EVP_DigestUpdate(&md_ctx, buffer, length)) |
|
goto err; |
|
} |
|
if (!EVP_DigestFinal(&md_ctx, *imprint, NULL)) |
|
goto err; |
|
|
|
return 1; |
|
err: |
|
X509_ALGOR_free(*md_alg); |
|
OPENSSL_free(*imprint); |
|
*imprint_len = 0; |
|
*imprint = NULL; |
|
return 0; |
|
} |
|
|
|
static int TS_check_imprints(X509_ALGOR *algor_a, |
|
unsigned char *imprint_a, unsigned len_a, |
|
TS_TST_INFO *tst_info) |
|
{ |
|
TS_MSG_IMPRINT *b = TS_TST_INFO_get_msg_imprint(tst_info); |
|
X509_ALGOR *algor_b = TS_MSG_IMPRINT_get_algo(b); |
|
int ret = 0; |
|
|
|
/* algor_a is optional. */ |
|
if (algor_a) { |
|
/* Compare algorithm OIDs. */ |
|
if (OBJ_cmp(algor_a->algorithm, algor_b->algorithm)) |
|
goto err; |
|
|
|
/* The parameter must be NULL in both. */ |
|
if ((algor_a->parameter |
|
&& ASN1_TYPE_get(algor_a->parameter) != V_ASN1_NULL) |
|
|| (algor_b->parameter |
|
&& ASN1_TYPE_get(algor_b->parameter) != V_ASN1_NULL)) |
|
goto err; |
|
} |
|
|
|
/* Compare octet strings. */ |
|
ret = len_a == (unsigned)ASN1_STRING_length(b->hashed_msg) && |
|
memcmp(imprint_a, ASN1_STRING_data(b->hashed_msg), len_a) == 0; |
|
err: |
|
if (!ret) |
|
TSerr(TS_F_TS_CHECK_IMPRINTS, TS_R_MESSAGE_IMPRINT_MISMATCH); |
|
return ret; |
|
} |
|
|
|
static int TS_check_nonces(const ASN1_INTEGER *a, TS_TST_INFO *tst_info) |
|
{ |
|
const ASN1_INTEGER *b = TS_TST_INFO_get_nonce(tst_info); |
|
|
|
/* Error if nonce is missing. */ |
|
if (!b) { |
|
TSerr(TS_F_TS_CHECK_NONCES, TS_R_NONCE_NOT_RETURNED); |
|
return 0; |
|
} |
|
|
|
/* No error if a nonce is returned without being requested. */ |
|
if (ASN1_INTEGER_cmp(a, b) != 0) { |
|
TSerr(TS_F_TS_CHECK_NONCES, TS_R_NONCE_MISMATCH); |
|
return 0; |
|
} |
|
|
|
return 1; |
|
} |
|
|
|
/* |
|
* Check if the specified TSA name matches either the subject or one of the |
|
* subject alternative names of the TSA certificate. |
|
*/ |
|
static int TS_check_signer_name(GENERAL_NAME *tsa_name, X509 *signer) |
|
{ |
|
STACK_OF(GENERAL_NAME) *gen_names = NULL; |
|
int idx = -1; |
|
int found = 0; |
|
|
|
/* Check the subject name first. */ |
|
if (tsa_name->type == GEN_DIRNAME |
|
&& X509_name_cmp(tsa_name->d.dirn, signer->cert_info->subject) == 0) |
|
return 1; |
|
|
|
/* Check all the alternative names. */ |
|
gen_names = X509_get_ext_d2i(signer, NID_subject_alt_name, NULL, &idx); |
|
while (gen_names != NULL |
|
&& !(found = TS_find_name(gen_names, tsa_name) >= 0)) { |
|
/* |
|
* Get the next subject alternative name, although there should be no |
|
* more than one. |
|
*/ |
|
GENERAL_NAMES_free(gen_names); |
|
gen_names = X509_get_ext_d2i(signer, NID_subject_alt_name, |
|
NULL, &idx); |
|
} |
|
if (gen_names) |
|
GENERAL_NAMES_free(gen_names); |
|
|
|
return found; |
|
} |
|
|
|
/* Returns 1 if name is in gen_names, 0 otherwise. */ |
|
static int TS_find_name(STACK_OF(GENERAL_NAME) *gen_names, GENERAL_NAME *name) |
|
{ |
|
int i, found; |
|
for (i = 0, found = 0; !found && i < sk_GENERAL_NAME_num(gen_names); ++i) { |
|
GENERAL_NAME *current = sk_GENERAL_NAME_value(gen_names, i); |
|
found = GENERAL_NAME_cmp(current, name) == 0; |
|
} |
|
return found ? i - 1 : -1; |
|
}
|
|
|