diff options
Diffstat (limited to 'openssl/crypto/ts/ts_rsp_verify.c')
| -rw-r--r-- | openssl/crypto/ts/ts_rsp_verify.c | 725 |
1 files changed, 725 insertions, 0 deletions
diff --git a/openssl/crypto/ts/ts_rsp_verify.c b/openssl/crypto/ts/ts_rsp_verify.c new file mode 100644 index 000000000..e1f3b534a --- /dev/null +++ b/openssl/crypto/ts/ts_rsp_verify.c @@ -0,0 +1,725 @@ +/* crypto/ts/ts_resp_verify.c */ +/* Written by Zoltan Glozik (zglozik@stones.com) for the OpenSSL + * project 2002. + */ +/* ==================================================================== + * Copyright (c) 2006 The OpenSSL Project. All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in + * the documentation and/or other materials provided with the + * distribution. + * + * 3. All advertising materials mentioning features or use of this + * software must display the following acknowledgment: + * "This product includes software developed by the OpenSSL Project + * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)" + * + * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to + * endorse or promote products derived from this software without + * prior written permission. For written permission, please contact + * licensing@OpenSSL.org. + * + * 5. Products derived from this software may not be called "OpenSSL" + * nor may "OpenSSL" appear in their names without prior written + * permission of the OpenSSL Project. + * + * 6. Redistributions of any form whatsoever must retain the following + * acknowledgment: + * "This product includes software developed by the OpenSSL Project + * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)" + * + * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY + * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR + * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR + * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT + * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; + * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, + * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) + * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED + * OF THE POSSIBILITY OF SUCH DAMAGE. + * ==================================================================== + * + * This product includes cryptographic software written by Eric Young + * (eay@cryptsoft.com). This product includes software written by Tim + * Hudson (tjh@cryptsoft.com). + * + */ + +#include <stdio.h> +#include "cryptlib.h" +#include <openssl/objects.h> +#include <openssl/ts.h> +#include <openssl/pkcs7.h> + +/* Private function declarations. */ + +static int TS_verify_cert(X509_STORE *store, STACK_OF(X509) *untrusted, + X509 *signer, STACK_OF(X509) **chain); +static int TS_check_signing_certs(PKCS7_SIGNER_INFO *si, STACK_OF(X509) *chain); +static ESS_SIGNING_CERT *ESS_get_signing_cert(PKCS7_SIGNER_INFO *si); +static int TS_find_cert(STACK_OF(ESS_CERT_ID) *cert_ids, X509 *cert); +static int TS_issuer_serial_cmp(ESS_ISSUER_SERIAL *is, X509_CINF *cinfo); +static int int_TS_RESP_verify_token(TS_VERIFY_CTX *ctx, + PKCS7 *token, TS_TST_INFO *tst_info); +static int TS_check_status_info(TS_RESP *response); +static char *TS_get_status_text(STACK_OF(ASN1_UTF8STRING) *text); +static int TS_check_policy(ASN1_OBJECT *req_oid, TS_TST_INFO *tst_info); +static int TS_compute_imprint(BIO *data, TS_TST_INFO *tst_info, + X509_ALGOR **md_alg, + unsigned char **imprint, unsigned *imprint_len); +static int TS_check_imprints(X509_ALGOR *algor_a, + unsigned char *imprint_a, unsigned len_a, + TS_TST_INFO *tst_info); +static int TS_check_nonces(const ASN1_INTEGER *a, TS_TST_INFO *tst_info); +static int TS_check_signer_name(GENERAL_NAME *tsa_name, X509 *signer); +static int TS_find_name(STACK_OF(GENERAL_NAME) *gen_names, GENERAL_NAME *name); + +/* + * Local mapping between response codes and descriptions. + * Don't forget to change TS_STATUS_BUF_SIZE when modifying + * the elements of this array. + */ +static const char *TS_status_text[] = + { "granted", + "grantedWithMods", + "rejection", + "waiting", + "revocationWarning", + "revocationNotification" }; + +#define TS_STATUS_TEXT_SIZE (sizeof(TS_status_text)/sizeof(*TS_status_text)) + +/* + * This must be greater or equal to the sum of the strings in TS_status_text + * plus the number of its elements. + */ +#define TS_STATUS_BUF_SIZE 256 + +static struct + { + int code; + const char *text; + } TS_failure_info[] = + { { TS_INFO_BAD_ALG, "badAlg" }, + { TS_INFO_BAD_REQUEST, "badRequest" }, + { TS_INFO_BAD_DATA_FORMAT, "badDataFormat" }, + { TS_INFO_TIME_NOT_AVAILABLE, "timeNotAvailable" }, + { TS_INFO_UNACCEPTED_POLICY, "unacceptedPolicy" }, + { TS_INFO_UNACCEPTED_EXTENSION, "unacceptedExtension" }, + { TS_INFO_ADD_INFO_NOT_AVAILABLE, "addInfoNotAvailable" }, + { TS_INFO_SYSTEM_FAILURE, "systemFailure" } }; + +#define TS_FAILURE_INFO_SIZE (sizeof(TS_failure_info) / \ + sizeof(*TS_failure_info)) + +/* Functions for verifying a signed TS_TST_INFO structure. */ + +/* + * This function carries out the following tasks: + * - Checks if there is one and only one signer. + * - Search for the signing certificate in 'certs' and in the response. + * - Check the extended key usage and key usage fields of the signer + * certificate (done by the path validation). + * - Build and validate the certificate path. + * - Check if the certificate path meets the requirements of the + * SigningCertificate ESS signed attribute. + * - Verify the signature value. + * - Returns the signer certificate in 'signer', if 'signer' is not NULL. + */ +int TS_RESP_verify_signature(PKCS7 *token, STACK_OF(X509) *certs, + X509_STORE *store, X509 **signer_out) + { + STACK_OF(PKCS7_SIGNER_INFO) *sinfos = NULL; + PKCS7_SIGNER_INFO *si; + STACK_OF(X509) *signers = NULL; + X509 *signer; + STACK_OF(X509) *chain = NULL; + char buf[4096]; + int i, j = 0, ret = 0; + BIO *p7bio = NULL; + + /* Some sanity checks first. */ + if (!token) + { + TSerr(TS_F_TS_RESP_VERIFY_SIGNATURE, TS_R_INVALID_NULL_POINTER); + goto err; + } + + /* Check for the correct content type */ + if(!PKCS7_type_is_signed(token)) + { + TSerr(TS_F_TS_RESP_VERIFY_SIGNATURE, TS_R_WRONG_CONTENT_TYPE); + goto err; + } + + /* Check if there is one and only one signer. */ + sinfos = PKCS7_get_signer_info(token); + if (!sinfos || sk_PKCS7_SIGNER_INFO_num(sinfos) != 1) + { + TSerr(TS_F_TS_RESP_VERIFY_SIGNATURE, + TS_R_THERE_MUST_BE_ONE_SIGNER); + goto err; + } + si = sk_PKCS7_SIGNER_INFO_value(sinfos, 0); + + /* Check for no content: no data to verify signature. */ + if (PKCS7_get_detached(token)) + { + TSerr(TS_F_TS_RESP_VERIFY_SIGNATURE, TS_R_NO_CONTENT); + goto err; + } + + /* Get hold of the signer certificate, search only internal + certificates if it was requested. */ + signers = PKCS7_get0_signers(token, certs, 0); + if (!signers || sk_X509_num(signers) != 1) goto err; + signer = sk_X509_value(signers, 0); + + /* Now verify the certificate. */ + if (!TS_verify_cert(store, certs, signer, &chain)) goto err; + + /* Check if the signer certificate is consistent with the + ESS extension. */ + if (!TS_check_signing_certs(si, chain)) goto err; + + /* Creating the message digest. */ + p7bio = PKCS7_dataInit(token, NULL); + + /* We now have to 'read' from p7bio to calculate digests etc. */ + while ((i = BIO_read(p7bio,buf,sizeof(buf))) > 0); + + /* Verifying the signature. */ + j = PKCS7_signatureVerify(p7bio, token, si, signer); + if (j <= 0) + { + TSerr(TS_F_TS_RESP_VERIFY_SIGNATURE, TS_R_SIGNATURE_FAILURE); + goto err; + } + + /* Return the signer certificate if needed. */ + if (signer_out) + { + *signer_out = signer; + CRYPTO_add(&signer->references, 1, CRYPTO_LOCK_X509); + } + + ret = 1; + + err: + BIO_free_all(p7bio); + sk_X509_pop_free(chain, X509_free); + sk_X509_free(signers); + + return ret; + } + +/* + * The certificate chain is returned in chain. Caller is responsible for + * freeing the vector. + */ +static int TS_verify_cert(X509_STORE *store, STACK_OF(X509) *untrusted, + X509 *signer, STACK_OF(X509) **chain) + { + X509_STORE_CTX cert_ctx; + int i; + int ret = 1; + + /* chain is an out argument. */ + *chain = NULL; + X509_STORE_CTX_init(&cert_ctx, store, signer, untrusted); + X509_STORE_CTX_set_purpose(&cert_ctx, X509_PURPOSE_TIMESTAMP_SIGN); + i = X509_verify_cert(&cert_ctx); + if (i <= 0) + { + int j = X509_STORE_CTX_get_error(&cert_ctx); + TSerr(TS_F_TS_VERIFY_CERT, TS_R_CERTIFICATE_VERIFY_ERROR); + ERR_add_error_data(2, "Verify error:", + X509_verify_cert_error_string(j)); + ret = 0; + } + else + { + /* Get a copy of the certificate chain. */ + *chain = X509_STORE_CTX_get1_chain(&cert_ctx); + } + + X509_STORE_CTX_cleanup(&cert_ctx); + + return ret; + } + +static int TS_check_signing_certs(PKCS7_SIGNER_INFO *si, STACK_OF(X509) *chain) + { + ESS_SIGNING_CERT *ss = ESS_get_signing_cert(si); + STACK_OF(ESS_CERT_ID) *cert_ids = NULL; + X509 *cert; + int i = 0; + int ret = 0; + + if (!ss) goto err; + cert_ids = ss->cert_ids; + /* The signer certificate must be the first in cert_ids. */ + cert = sk_X509_value(chain, 0); + if (TS_find_cert(cert_ids, cert) != 0) goto err; + + /* Check the other certificates of the chain if there are more + than one certificate ids in cert_ids. */ + if (sk_ESS_CERT_ID_num(cert_ids) > 1) + { + /* All the certificates of the chain must be in cert_ids. */ + for (i = 1; i < sk_X509_num(chain); ++i) + { + cert = sk_X509_value(chain, i); + if (TS_find_cert(cert_ids, cert) < 0) goto err; + } + } + ret = 1; + err: + if (!ret) + TSerr(TS_F_TS_CHECK_SIGNING_CERTS, + TS_R_ESS_SIGNING_CERTIFICATE_ERROR); + ESS_SIGNING_CERT_free(ss); + return ret; + } + +static ESS_SIGNING_CERT *ESS_get_signing_cert(PKCS7_SIGNER_INFO *si) + { + ASN1_TYPE *attr; + const unsigned char *p; + attr = PKCS7_get_signed_attribute(si, + NID_id_smime_aa_signingCertificate); + if (!attr) return NULL; + p = attr->value.sequence->data; + return d2i_ESS_SIGNING_CERT(NULL, &p, attr->value.sequence->length); + } + +/* Returns < 0 if certificate is not found, certificate index otherwise. */ +static int TS_find_cert(STACK_OF(ESS_CERT_ID) *cert_ids, X509 *cert) + { + int i; + + if (!cert_ids || !cert) return -1; + + /* Recompute SHA1 hash of certificate if necessary (side effect). */ + X509_check_purpose(cert, -1, 0); + + /* Look for cert in the cert_ids vector. */ + for (i = 0; i < sk_ESS_CERT_ID_num(cert_ids); ++i) + { + ESS_CERT_ID *cid = sk_ESS_CERT_ID_value(cert_ids, i); + + /* Check the SHA-1 hash first. */ + if (cid->hash->length == sizeof(cert->sha1_hash) + && !memcmp(cid->hash->data, cert->sha1_hash, + sizeof(cert->sha1_hash))) + { + /* Check the issuer/serial as well if specified. */ + ESS_ISSUER_SERIAL *is = cid->issuer_serial; + if (!is || !TS_issuer_serial_cmp(is, cert->cert_info)) + return i; + } + } + + return -1; + } + +static int TS_issuer_serial_cmp(ESS_ISSUER_SERIAL *is, X509_CINF *cinfo) + { + GENERAL_NAME *issuer; + + if (!is || !cinfo || sk_GENERAL_NAME_num(is->issuer) != 1) return -1; + + /* Check the issuer first. It must be a directory name. */ + issuer = sk_GENERAL_NAME_value(is->issuer, 0); + if (issuer->type != GEN_DIRNAME + || X509_NAME_cmp(issuer->d.dirn, cinfo->issuer)) + return -1; + + /* Check the serial number, too. */ + if (ASN1_INTEGER_cmp(is->serial, cinfo->serialNumber)) + return -1; + + return 0; + } + +/* + * Verifies whether 'response' contains a valid response with regards + * to the settings of the context: + * - Gives an error message if the TS_TST_INFO is not present. + * - Calls _TS_RESP_verify_token to verify the token content. + */ +int TS_RESP_verify_response(TS_VERIFY_CTX *ctx, TS_RESP *response) + { + PKCS7 *token = TS_RESP_get_token(response); + TS_TST_INFO *tst_info = TS_RESP_get_tst_info(response); + int ret = 0; + + /* Check if we have a successful TS_TST_INFO object in place. */ + if (!TS_check_status_info(response)) goto err; + + /* Check the contents of the time stamp token. */ + if (!int_TS_RESP_verify_token(ctx, token, tst_info)) + goto err; + + ret = 1; + err: + return ret; + } + +/* + * Tries to extract a TS_TST_INFO structure from the PKCS7 token and + * calls the internal int_TS_RESP_verify_token function for verifying it. + */ +int TS_RESP_verify_token(TS_VERIFY_CTX *ctx, PKCS7 *token) + { + TS_TST_INFO *tst_info = PKCS7_to_TS_TST_INFO(token); + int ret = 0; + if (tst_info) + { + ret = int_TS_RESP_verify_token(ctx, token, tst_info); + TS_TST_INFO_free(tst_info); + } + return ret; + } + +/* + * Verifies whether the 'token' contains a valid time stamp token + * with regards to the settings of the context. Only those checks are + * carried out that are specified in the context: + * - Verifies the signature of the TS_TST_INFO. + * - Checks the version number of the response. + * - Check if the requested and returned policies math. + * - Check if the message imprints are the same. + * - Check if the nonces are the same. + * - Check if the TSA name matches the signer. + * - Check if the TSA name is the expected TSA. + */ +static int int_TS_RESP_verify_token(TS_VERIFY_CTX *ctx, + PKCS7 *token, TS_TST_INFO *tst_info) + { + X509 *signer = NULL; + GENERAL_NAME *tsa_name = TS_TST_INFO_get_tsa(tst_info); + X509_ALGOR *md_alg = NULL; + unsigned char *imprint = NULL; + unsigned imprint_len = 0; + int ret = 0; + + /* Verify the signature. */ + if ((ctx->flags & TS_VFY_SIGNATURE) + && !TS_RESP_verify_signature(token, ctx->certs, ctx->store, + &signer)) + goto err; + + /* Check version number of response. */ + if ((ctx->flags & TS_VFY_VERSION) + && TS_TST_INFO_get_version(tst_info) != 1) + { + TSerr(TS_F_INT_TS_RESP_VERIFY_TOKEN, TS_R_UNSUPPORTED_VERSION); + goto err; + } + + /* Check policies. */ + if ((ctx->flags & TS_VFY_POLICY) + && !TS_check_policy(ctx->policy, tst_info)) + goto err; + + /* Check message imprints. */ + if ((ctx->flags & TS_VFY_IMPRINT) + && !TS_check_imprints(ctx->md_alg, ctx->imprint, ctx->imprint_len, + tst_info)) + goto err; + + /* Compute and check message imprints. */ + if ((ctx->flags & TS_VFY_DATA) + && (!TS_compute_imprint(ctx->data, tst_info, + &md_alg, &imprint, &imprint_len) + || !TS_check_imprints(md_alg, imprint, imprint_len, tst_info))) + goto err; + + /* Check nonces. */ + if ((ctx->flags & TS_VFY_NONCE) + && !TS_check_nonces(ctx->nonce, tst_info)) + goto err; + + /* Check whether TSA name and signer certificate match. */ + if ((ctx->flags & TS_VFY_SIGNER) + && tsa_name && !TS_check_signer_name(tsa_name, signer)) + { + TSerr(TS_F_INT_TS_RESP_VERIFY_TOKEN, TS_R_TSA_NAME_MISMATCH); + goto err; + } + + /* Check whether the TSA is the expected one. */ + if ((ctx->flags & TS_VFY_TSA_NAME) + && !TS_check_signer_name(ctx->tsa_name, signer)) + { + TSerr(TS_F_INT_TS_RESP_VERIFY_TOKEN, TS_R_TSA_UNTRUSTED); + goto err; + } + + ret = 1; + err: + X509_free(signer); + X509_ALGOR_free(md_alg); + OPENSSL_free(imprint); + return ret; + } + +static int TS_check_status_info(TS_RESP *response) + { + TS_STATUS_INFO *info = TS_RESP_get_status_info(response); + long status = ASN1_INTEGER_get(info->status); + const char *status_text = NULL; + char *embedded_status_text = NULL; + char failure_text[TS_STATUS_BUF_SIZE] = ""; + + /* Check if everything went fine. */ + if (status == 0 || status == 1) return 1; + + /* There was an error, get the description in status_text. */ + if (0 <= status && status < (long)TS_STATUS_TEXT_SIZE) + status_text = TS_status_text[status]; + else + status_text = "unknown code"; + + /* Set the embedded_status_text to the returned description. */ + if (sk_ASN1_UTF8STRING_num(info->text) > 0 + && !(embedded_status_text = TS_get_status_text(info->text))) + return 0; + + /* 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) + strcpy(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; + } + + EVP_DigestInit(&md_ctx, md); + while ((length = BIO_read(data, buffer, sizeof(buffer))) > 0) + { + EVP_DigestUpdate(&md_ctx, buffer, length); + } + EVP_DigestFinal(&md_ctx, *imprint, NULL); + + return 1; + err: + X509_ALGOR_free(*md_alg); + OPENSSL_free(*imprint); + *imprint_len = 0; + 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; + } |