| /* 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; |
| if (!X509_STORE_CTX_init(&cert_ctx, store, signer, untrusted)) |
| return 0; |
| 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) |
| 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; |
| } |
