[331] | 1 | /*
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| 2 | * Copyright 2006-2016 The OpenSSL Project Authors. All Rights Reserved.
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| 3 | *
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| 4 | * Licensed under the OpenSSL license (the "License"). You may not use
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| 5 | * this file except in compliance with the License. You can obtain a copy
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| 6 | * in the file LICENSE in the source distribution or at
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| 7 | * https://www.openssl.org/source/license.html
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| 8 | */
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| 9 |
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| 10 | #include <stdio.h>
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| 11 | #include "internal/cryptlib.h"
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| 12 | #include <openssl/objects.h>
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| 13 | #include <openssl/ts.h>
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| 14 | #include <openssl/pkcs7.h>
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| 15 | #include "ts_lcl.h"
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| 16 |
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| 17 | static int ts_verify_cert(X509_STORE *store, STACK_OF(X509) *untrusted,
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| 18 | X509 *signer, STACK_OF(X509) **chain);
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| 19 | static int ts_check_signing_certs(PKCS7_SIGNER_INFO *si,
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| 20 | STACK_OF(X509) *chain);
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| 21 | static ESS_SIGNING_CERT *ess_get_signing_cert(PKCS7_SIGNER_INFO *si);
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| 22 | static int ts_find_cert(STACK_OF(ESS_CERT_ID) *cert_ids, X509 *cert);
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| 23 | static int ts_issuer_serial_cmp(ESS_ISSUER_SERIAL *is, X509 *cert);
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| 24 | static int int_ts_RESP_verify_token(TS_VERIFY_CTX *ctx,
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| 25 | PKCS7 *token, TS_TST_INFO *tst_info);
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| 26 | static int ts_check_status_info(TS_RESP *response);
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| 27 | static char *ts_get_status_text(STACK_OF(ASN1_UTF8STRING) *text);
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| 28 | static int ts_check_policy(const ASN1_OBJECT *req_oid,
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| 29 | const TS_TST_INFO *tst_info);
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| 30 | static int ts_compute_imprint(BIO *data, TS_TST_INFO *tst_info,
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| 31 | X509_ALGOR **md_alg,
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| 32 | unsigned char **imprint, unsigned *imprint_len);
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| 33 | static int ts_check_imprints(X509_ALGOR *algor_a,
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| 34 | const unsigned char *imprint_a, unsigned len_a,
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| 35 | TS_TST_INFO *tst_info);
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| 36 | static int ts_check_nonces(const ASN1_INTEGER *a, TS_TST_INFO *tst_info);
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| 37 | static int ts_check_signer_name(GENERAL_NAME *tsa_name, X509 *signer);
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| 38 | static int ts_find_name(STACK_OF(GENERAL_NAME) *gen_names,
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| 39 | GENERAL_NAME *name);
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| 40 |
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| 41 | /*
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| 42 | * This must be large enough to hold all values in ts_status_text (with
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| 43 | * comma separator) or all text fields in ts_failure_info (also with comma).
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| 44 | */
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| 45 | #define TS_STATUS_BUF_SIZE 256
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| 46 |
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| 47 | /*
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| 48 | * Local mapping between response codes and descriptions.
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| 49 | */
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| 50 | static const char *ts_status_text[] = {
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| 51 | "granted",
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| 52 | "grantedWithMods",
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| 53 | "rejection",
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| 54 | "waiting",
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| 55 | "revocationWarning",
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| 56 | "revocationNotification"
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| 57 | };
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| 58 |
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| 59 | #define TS_STATUS_TEXT_SIZE OSSL_NELEM(ts_status_text)
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| 60 |
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| 61 | static struct {
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| 62 | int code;
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| 63 | const char *text;
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| 64 | } ts_failure_info[] = {
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| 65 | {TS_INFO_BAD_ALG, "badAlg"},
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| 66 | {TS_INFO_BAD_REQUEST, "badRequest"},
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| 67 | {TS_INFO_BAD_DATA_FORMAT, "badDataFormat"},
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| 68 | {TS_INFO_TIME_NOT_AVAILABLE, "timeNotAvailable"},
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| 69 | {TS_INFO_UNACCEPTED_POLICY, "unacceptedPolicy"},
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| 70 | {TS_INFO_UNACCEPTED_EXTENSION, "unacceptedExtension"},
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| 71 | {TS_INFO_ADD_INFO_NOT_AVAILABLE, "addInfoNotAvailable"},
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| 72 | {TS_INFO_SYSTEM_FAILURE, "systemFailure"}
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| 73 | };
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| 74 |
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| 75 |
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| 76 | /*-
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| 77 | * This function carries out the following tasks:
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| 78 | * - Checks if there is one and only one signer.
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| 79 | * - Search for the signing certificate in 'certs' and in the response.
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| 80 | * - Check the extended key usage and key usage fields of the signer
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| 81 | * certificate (done by the path validation).
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| 82 | * - Build and validate the certificate path.
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| 83 | * - Check if the certificate path meets the requirements of the
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| 84 | * SigningCertificate ESS signed attribute.
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| 85 | * - Verify the signature value.
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| 86 | * - Returns the signer certificate in 'signer', if 'signer' is not NULL.
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| 87 | */
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| 88 | int TS_RESP_verify_signature(PKCS7 *token, STACK_OF(X509) *certs,
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| 89 | X509_STORE *store, X509 **signer_out)
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| 90 | {
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| 91 | STACK_OF(PKCS7_SIGNER_INFO) *sinfos = NULL;
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| 92 | PKCS7_SIGNER_INFO *si;
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| 93 | STACK_OF(X509) *signers = NULL;
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| 94 | X509 *signer;
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| 95 | STACK_OF(X509) *chain = NULL;
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| 96 | char buf[4096];
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| 97 | int i, j = 0, ret = 0;
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| 98 | BIO *p7bio = NULL;
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| 99 |
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| 100 | /* Some sanity checks first. */
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| 101 | if (!token) {
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| 102 | TSerr(TS_F_TS_RESP_VERIFY_SIGNATURE, TS_R_INVALID_NULL_POINTER);
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| 103 | goto err;
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| 104 | }
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| 105 | if (!PKCS7_type_is_signed(token)) {
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| 106 | TSerr(TS_F_TS_RESP_VERIFY_SIGNATURE, TS_R_WRONG_CONTENT_TYPE);
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| 107 | goto err;
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| 108 | }
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| 109 | sinfos = PKCS7_get_signer_info(token);
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| 110 | if (!sinfos || sk_PKCS7_SIGNER_INFO_num(sinfos) != 1) {
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| 111 | TSerr(TS_F_TS_RESP_VERIFY_SIGNATURE, TS_R_THERE_MUST_BE_ONE_SIGNER);
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| 112 | goto err;
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| 113 | }
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| 114 | si = sk_PKCS7_SIGNER_INFO_value(sinfos, 0);
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| 115 | if (PKCS7_get_detached(token)) {
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| 116 | TSerr(TS_F_TS_RESP_VERIFY_SIGNATURE, TS_R_NO_CONTENT);
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| 117 | goto err;
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| 118 | }
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| 119 |
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| 120 | /*
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| 121 | * Get hold of the signer certificate, search only internal certificates
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| 122 | * if it was requested.
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| 123 | */
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| 124 | signers = PKCS7_get0_signers(token, certs, 0);
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| 125 | if (!signers || sk_X509_num(signers) != 1)
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| 126 | goto err;
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| 127 | signer = sk_X509_value(signers, 0);
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| 128 |
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| 129 | if (!ts_verify_cert(store, certs, signer, &chain))
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| 130 | goto err;
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| 131 | if (!ts_check_signing_certs(si, chain))
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| 132 | goto err;
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| 133 | p7bio = PKCS7_dataInit(token, NULL);
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| 134 |
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| 135 | /* We now have to 'read' from p7bio to calculate digests etc. */
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| 136 | while ((i = BIO_read(p7bio, buf, sizeof(buf))) > 0)
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| 137 | continue;
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| 138 |
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| 139 | j = PKCS7_signatureVerify(p7bio, token, si, signer);
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| 140 | if (j <= 0) {
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| 141 | TSerr(TS_F_TS_RESP_VERIFY_SIGNATURE, TS_R_SIGNATURE_FAILURE);
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| 142 | goto err;
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| 143 | }
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| 144 |
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| 145 | if (signer_out) {
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| 146 | *signer_out = signer;
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| 147 | X509_up_ref(signer);
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| 148 | }
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| 149 | ret = 1;
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| 150 |
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| 151 | err:
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| 152 | BIO_free_all(p7bio);
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| 153 | sk_X509_pop_free(chain, X509_free);
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| 154 | sk_X509_free(signers);
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| 155 |
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| 156 | return ret;
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| 157 | }
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| 158 |
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| 159 | /*
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| 160 | * The certificate chain is returned in chain. Caller is responsible for
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| 161 | * freeing the vector.
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| 162 | */
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| 163 | static int ts_verify_cert(X509_STORE *store, STACK_OF(X509) *untrusted,
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| 164 | X509 *signer, STACK_OF(X509) **chain)
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| 165 | {
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| 166 | X509_STORE_CTX *cert_ctx = NULL;
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| 167 | int i;
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| 168 | int ret = 0;
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| 169 |
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| 170 | *chain = NULL;
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| 171 | cert_ctx = X509_STORE_CTX_new();
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| 172 | if (cert_ctx == NULL) {
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| 173 | TSerr(TS_F_TS_VERIFY_CERT, ERR_R_MALLOC_FAILURE);
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| 174 | goto err;
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| 175 | }
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| 176 | if (!X509_STORE_CTX_init(cert_ctx, store, signer, untrusted))
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| 177 | goto end;
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| 178 | X509_STORE_CTX_set_purpose(cert_ctx, X509_PURPOSE_TIMESTAMP_SIGN);
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| 179 | i = X509_verify_cert(cert_ctx);
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| 180 | if (i <= 0) {
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| 181 | int j = X509_STORE_CTX_get_error(cert_ctx);
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| 182 | TSerr(TS_F_TS_VERIFY_CERT, TS_R_CERTIFICATE_VERIFY_ERROR);
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| 183 | ERR_add_error_data(2, "Verify error:",
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| 184 | X509_verify_cert_error_string(j));
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| 185 | goto err;
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| 186 | }
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| 187 | *chain = X509_STORE_CTX_get1_chain(cert_ctx);
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| 188 | ret = 1;
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| 189 | goto end;
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| 190 |
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| 191 | err:
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| 192 | ret = 0;
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| 193 |
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| 194 | end:
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| 195 | X509_STORE_CTX_free(cert_ctx);
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| 196 | return ret;
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| 197 | }
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| 198 |
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| 199 | static int ts_check_signing_certs(PKCS7_SIGNER_INFO *si,
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| 200 | STACK_OF(X509) *chain)
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| 201 | {
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| 202 | ESS_SIGNING_CERT *ss = ess_get_signing_cert(si);
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| 203 | STACK_OF(ESS_CERT_ID) *cert_ids = NULL;
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| 204 | X509 *cert;
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| 205 | int i = 0;
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| 206 | int ret = 0;
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| 207 |
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| 208 | if (!ss)
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| 209 | goto err;
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| 210 | cert_ids = ss->cert_ids;
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| 211 | cert = sk_X509_value(chain, 0);
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| 212 | if (ts_find_cert(cert_ids, cert) != 0)
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| 213 | goto err;
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| 214 |
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| 215 | /*
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| 216 | * Check the other certificates of the chain if there are more than one
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| 217 | * certificate ids in cert_ids.
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| 218 | */
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| 219 | if (sk_ESS_CERT_ID_num(cert_ids) > 1) {
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| 220 | for (i = 1; i < sk_X509_num(chain); ++i) {
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| 221 | cert = sk_X509_value(chain, i);
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| 222 | if (ts_find_cert(cert_ids, cert) < 0)
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| 223 | goto err;
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| 224 | }
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| 225 | }
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| 226 | ret = 1;
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| 227 | err:
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| 228 | if (!ret)
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| 229 | TSerr(TS_F_TS_CHECK_SIGNING_CERTS,
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| 230 | TS_R_ESS_SIGNING_CERTIFICATE_ERROR);
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| 231 | ESS_SIGNING_CERT_free(ss);
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| 232 | return ret;
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| 233 | }
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| 234 |
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| 235 | static ESS_SIGNING_CERT *ess_get_signing_cert(PKCS7_SIGNER_INFO *si)
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| 236 | {
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| 237 | ASN1_TYPE *attr;
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| 238 | const unsigned char *p;
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| 239 | attr = PKCS7_get_signed_attribute(si, NID_id_smime_aa_signingCertificate);
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| 240 | if (!attr)
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| 241 | return NULL;
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| 242 | p = attr->value.sequence->data;
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| 243 | return d2i_ESS_SIGNING_CERT(NULL, &p, attr->value.sequence->length);
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| 244 | }
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| 245 |
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| 246 | /* Returns < 0 if certificate is not found, certificate index otherwise. */
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| 247 | static int ts_find_cert(STACK_OF(ESS_CERT_ID) *cert_ids, X509 *cert)
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| 248 | {
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| 249 | int i;
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| 250 | unsigned char cert_sha1[SHA_DIGEST_LENGTH];
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| 251 |
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| 252 | if (!cert_ids || !cert)
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| 253 | return -1;
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| 254 |
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| 255 | X509_digest(cert, EVP_sha1(), cert_sha1, NULL);
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| 256 |
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| 257 | /* Recompute SHA1 hash of certificate if necessary (side effect). */
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| 258 | X509_check_purpose(cert, -1, 0);
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| 259 |
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| 260 | /* Look for cert in the cert_ids vector. */
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| 261 | for (i = 0; i < sk_ESS_CERT_ID_num(cert_ids); ++i) {
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| 262 | ESS_CERT_ID *cid = sk_ESS_CERT_ID_value(cert_ids, i);
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| 263 |
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| 264 | if (cid->hash->length == SHA_DIGEST_LENGTH
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| 265 | && memcmp(cid->hash->data, cert_sha1, SHA_DIGEST_LENGTH) == 0) {
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| 266 | ESS_ISSUER_SERIAL *is = cid->issuer_serial;
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| 267 | if (!is || !ts_issuer_serial_cmp(is, cert))
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| 268 | return i;
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| 269 | }
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| 270 | }
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| 271 |
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| 272 | return -1;
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| 273 | }
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| 274 |
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| 275 | static int ts_issuer_serial_cmp(ESS_ISSUER_SERIAL *is, X509 *cert)
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| 276 | {
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| 277 | GENERAL_NAME *issuer;
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| 278 |
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| 279 | if (!is || !cert || sk_GENERAL_NAME_num(is->issuer) != 1)
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| 280 | return -1;
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| 281 |
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| 282 | issuer = sk_GENERAL_NAME_value(is->issuer, 0);
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| 283 | if (issuer->type != GEN_DIRNAME
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| 284 | || X509_NAME_cmp(issuer->d.dirn, X509_get_issuer_name(cert)))
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| 285 | return -1;
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| 286 |
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| 287 | if (ASN1_INTEGER_cmp(is->serial, X509_get_serialNumber(cert)))
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| 288 | return -1;
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| 289 |
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| 290 | return 0;
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| 291 | }
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| 292 |
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| 293 | /*-
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| 294 | * Verifies whether 'response' contains a valid response with regards
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| 295 | * to the settings of the context:
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| 296 | * - Gives an error message if the TS_TST_INFO is not present.
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| 297 | * - Calls _TS_RESP_verify_token to verify the token content.
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| 298 | */
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| 299 | int TS_RESP_verify_response(TS_VERIFY_CTX *ctx, TS_RESP *response)
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| 300 | {
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| 301 | PKCS7 *token = response->token;
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| 302 | TS_TST_INFO *tst_info = response->tst_info;
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| 303 | int ret = 0;
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| 304 |
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| 305 | if (!ts_check_status_info(response))
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| 306 | goto err;
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| 307 | if (!int_ts_RESP_verify_token(ctx, token, tst_info))
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| 308 | goto err;
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| 309 | ret = 1;
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| 310 |
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| 311 | err:
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| 312 | return ret;
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| 313 | }
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| 314 |
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| 315 | /*
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| 316 | * Tries to extract a TS_TST_INFO structure from the PKCS7 token and
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| 317 | * calls the internal int_TS_RESP_verify_token function for verifying it.
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| 318 | */
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| 319 | int TS_RESP_verify_token(TS_VERIFY_CTX *ctx, PKCS7 *token)
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| 320 | {
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| 321 | TS_TST_INFO *tst_info = PKCS7_to_TS_TST_INFO(token);
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| 322 | int ret = 0;
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| 323 | if (tst_info) {
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| 324 | ret = int_ts_RESP_verify_token(ctx, token, tst_info);
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| 325 | TS_TST_INFO_free(tst_info);
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| 326 | }
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| 327 | return ret;
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| 328 | }
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| 329 |
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| 330 | /*-
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| 331 | * Verifies whether the 'token' contains a valid time stamp token
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| 332 | * with regards to the settings of the context. Only those checks are
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| 333 | * carried out that are specified in the context:
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| 334 | * - Verifies the signature of the TS_TST_INFO.
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| 335 | * - Checks the version number of the response.
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| 336 | * - Check if the requested and returned policies math.
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| 337 | * - Check if the message imprints are the same.
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| 338 | * - Check if the nonces are the same.
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| 339 | * - Check if the TSA name matches the signer.
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| 340 | * - Check if the TSA name is the expected TSA.
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| 341 | */
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| 342 | static int int_ts_RESP_verify_token(TS_VERIFY_CTX *ctx,
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| 343 | PKCS7 *token, TS_TST_INFO *tst_info)
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| 344 | {
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| 345 | X509 *signer = NULL;
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| 346 | GENERAL_NAME *tsa_name = tst_info->tsa;
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| 347 | X509_ALGOR *md_alg = NULL;
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| 348 | unsigned char *imprint = NULL;
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| 349 | unsigned imprint_len = 0;
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| 350 | int ret = 0;
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| 351 | int flags = ctx->flags;
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| 352 |
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| 353 | /* Some options require us to also check the signature */
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| 354 | if (((flags & TS_VFY_SIGNER) && tsa_name != NULL)
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| 355 | || (flags & TS_VFY_TSA_NAME)) {
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| 356 | flags |= TS_VFY_SIGNATURE;
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| 357 | }
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| 358 |
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| 359 | if ((flags & TS_VFY_SIGNATURE)
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| 360 | && !TS_RESP_verify_signature(token, ctx->certs, ctx->store, &signer))
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| 361 | goto err;
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| 362 | if ((flags & TS_VFY_VERSION)
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| 363 | && TS_TST_INFO_get_version(tst_info) != 1) {
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| 364 | TSerr(TS_F_INT_TS_RESP_VERIFY_TOKEN, TS_R_UNSUPPORTED_VERSION);
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| 365 | goto err;
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| 366 | }
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| 367 | if ((flags & TS_VFY_POLICY)
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| 368 | && !ts_check_policy(ctx->policy, tst_info))
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| 369 | goto err;
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| 370 | if ((flags & TS_VFY_IMPRINT)
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| 371 | && !ts_check_imprints(ctx->md_alg, ctx->imprint, ctx->imprint_len,
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| 372 | tst_info))
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| 373 | goto err;
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| 374 | if ((flags & TS_VFY_DATA)
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| 375 | && (!ts_compute_imprint(ctx->data, tst_info,
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| 376 | &md_alg, &imprint, &imprint_len)
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| 377 | || !ts_check_imprints(md_alg, imprint, imprint_len, tst_info)))
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| 378 | goto err;
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| 379 | if ((flags & TS_VFY_NONCE)
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| 380 | && !ts_check_nonces(ctx->nonce, tst_info))
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| 381 | goto err;
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| 382 | if ((flags & TS_VFY_SIGNER)
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| 383 | && tsa_name && !ts_check_signer_name(tsa_name, signer)) {
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| 384 | TSerr(TS_F_INT_TS_RESP_VERIFY_TOKEN, TS_R_TSA_NAME_MISMATCH);
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| 385 | goto err;
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| 386 | }
|
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| 387 | if ((flags & TS_VFY_TSA_NAME)
|
---|
| 388 | && !ts_check_signer_name(ctx->tsa_name, signer)) {
|
---|
| 389 | TSerr(TS_F_INT_TS_RESP_VERIFY_TOKEN, TS_R_TSA_UNTRUSTED);
|
---|
| 390 | goto err;
|
---|
| 391 | }
|
---|
| 392 | ret = 1;
|
---|
| 393 |
|
---|
| 394 | err:
|
---|
| 395 | X509_free(signer);
|
---|
| 396 | X509_ALGOR_free(md_alg);
|
---|
| 397 | OPENSSL_free(imprint);
|
---|
| 398 | return ret;
|
---|
| 399 | }
|
---|
| 400 |
|
---|
| 401 | static int ts_check_status_info(TS_RESP *response)
|
---|
| 402 | {
|
---|
| 403 | TS_STATUS_INFO *info = response->status_info;
|
---|
| 404 | long status = ASN1_INTEGER_get(info->status);
|
---|
| 405 | const char *status_text = NULL;
|
---|
| 406 | char *embedded_status_text = NULL;
|
---|
| 407 | char failure_text[TS_STATUS_BUF_SIZE] = "";
|
---|
| 408 |
|
---|
| 409 | if (status == 0 || status == 1)
|
---|
| 410 | return 1;
|
---|
| 411 |
|
---|
| 412 | /* There was an error, get the description in status_text. */
|
---|
| 413 | if (0 <= status && status < (long) OSSL_NELEM(ts_status_text))
|
---|
| 414 | status_text = ts_status_text[status];
|
---|
| 415 | else
|
---|
| 416 | status_text = "unknown code";
|
---|
| 417 |
|
---|
| 418 | if (sk_ASN1_UTF8STRING_num(info->text) > 0
|
---|
| 419 | && (embedded_status_text = ts_get_status_text(info->text)) == NULL)
|
---|
| 420 | return 0;
|
---|
| 421 |
|
---|
| 422 | /* Fill in failure_text with the failure information. */
|
---|
| 423 | if (info->failure_info) {
|
---|
| 424 | int i;
|
---|
| 425 | int first = 1;
|
---|
| 426 | for (i = 0; i < (int)OSSL_NELEM(ts_failure_info); ++i) {
|
---|
| 427 | if (ASN1_BIT_STRING_get_bit(info->failure_info,
|
---|
| 428 | ts_failure_info[i].code)) {
|
---|
| 429 | if (!first)
|
---|
| 430 | strcat(failure_text, ",");
|
---|
| 431 | else
|
---|
| 432 | first = 0;
|
---|
| 433 | strcat(failure_text, ts_failure_info[i].text);
|
---|
| 434 | }
|
---|
| 435 | }
|
---|
| 436 | }
|
---|
| 437 | if (failure_text[0] == '\0')
|
---|
| 438 | strcpy(failure_text, "unspecified");
|
---|
| 439 |
|
---|
| 440 | TSerr(TS_F_TS_CHECK_STATUS_INFO, TS_R_NO_TIME_STAMP_TOKEN);
|
---|
| 441 | ERR_add_error_data(6,
|
---|
| 442 | "status code: ", status_text,
|
---|
| 443 | ", status text: ", embedded_status_text ?
|
---|
| 444 | embedded_status_text : "unspecified",
|
---|
| 445 | ", failure codes: ", failure_text);
|
---|
| 446 | OPENSSL_free(embedded_status_text);
|
---|
| 447 |
|
---|
| 448 | return 0;
|
---|
| 449 | }
|
---|
| 450 |
|
---|
| 451 | static char *ts_get_status_text(STACK_OF(ASN1_UTF8STRING) *text)
|
---|
| 452 | {
|
---|
| 453 | int i;
|
---|
| 454 | int length = 0;
|
---|
| 455 | char *result = NULL;
|
---|
| 456 | char *p;
|
---|
| 457 |
|
---|
| 458 | for (i = 0; i < sk_ASN1_UTF8STRING_num(text); ++i) {
|
---|
| 459 | ASN1_UTF8STRING *current = sk_ASN1_UTF8STRING_value(text, i);
|
---|
| 460 | if (ASN1_STRING_length(current) > TS_MAX_STATUS_LENGTH - length - 1)
|
---|
| 461 | return NULL;
|
---|
| 462 | length += ASN1_STRING_length(current);
|
---|
| 463 | length += 1; /* separator character */
|
---|
| 464 | }
|
---|
| 465 | if ((result = OPENSSL_malloc(length)) == NULL) {
|
---|
| 466 | TSerr(TS_F_TS_GET_STATUS_TEXT, ERR_R_MALLOC_FAILURE);
|
---|
| 467 | return NULL;
|
---|
| 468 | }
|
---|
| 469 |
|
---|
| 470 | for (i = 0, p = result; i < sk_ASN1_UTF8STRING_num(text); ++i) {
|
---|
| 471 | ASN1_UTF8STRING *current = sk_ASN1_UTF8STRING_value(text, i);
|
---|
| 472 | length = ASN1_STRING_length(current);
|
---|
| 473 | if (i > 0)
|
---|
| 474 | *p++ = '/';
|
---|
| 475 | strncpy(p, (const char *)ASN1_STRING_get0_data(current), length);
|
---|
| 476 | p += length;
|
---|
| 477 | }
|
---|
| 478 | *p = '\0';
|
---|
| 479 |
|
---|
| 480 | return result;
|
---|
| 481 | }
|
---|
| 482 |
|
---|
| 483 | static int ts_check_policy(const ASN1_OBJECT *req_oid,
|
---|
| 484 | const TS_TST_INFO *tst_info)
|
---|
| 485 | {
|
---|
| 486 | const ASN1_OBJECT *resp_oid = tst_info->policy_id;
|
---|
| 487 |
|
---|
| 488 | if (OBJ_cmp(req_oid, resp_oid) != 0) {
|
---|
| 489 | TSerr(TS_F_TS_CHECK_POLICY, TS_R_POLICY_MISMATCH);
|
---|
| 490 | return 0;
|
---|
| 491 | }
|
---|
| 492 |
|
---|
| 493 | return 1;
|
---|
| 494 | }
|
---|
| 495 |
|
---|
| 496 | static int ts_compute_imprint(BIO *data, TS_TST_INFO *tst_info,
|
---|
| 497 | X509_ALGOR **md_alg,
|
---|
| 498 | unsigned char **imprint, unsigned *imprint_len)
|
---|
| 499 | {
|
---|
| 500 | TS_MSG_IMPRINT *msg_imprint = tst_info->msg_imprint;
|
---|
| 501 | X509_ALGOR *md_alg_resp = msg_imprint->hash_algo;
|
---|
| 502 | const EVP_MD *md;
|
---|
| 503 | EVP_MD_CTX *md_ctx = NULL;
|
---|
| 504 | unsigned char buffer[4096];
|
---|
| 505 | int length;
|
---|
| 506 |
|
---|
| 507 | *md_alg = NULL;
|
---|
| 508 | *imprint = NULL;
|
---|
| 509 |
|
---|
| 510 | if ((*md_alg = X509_ALGOR_dup(md_alg_resp)) == NULL)
|
---|
| 511 | goto err;
|
---|
| 512 | if ((md = EVP_get_digestbyobj((*md_alg)->algorithm)) == NULL) {
|
---|
| 513 | TSerr(TS_F_TS_COMPUTE_IMPRINT, TS_R_UNSUPPORTED_MD_ALGORITHM);
|
---|
| 514 | goto err;
|
---|
| 515 | }
|
---|
| 516 | length = EVP_MD_size(md);
|
---|
| 517 | if (length < 0)
|
---|
| 518 | goto err;
|
---|
| 519 | *imprint_len = length;
|
---|
| 520 | if ((*imprint = OPENSSL_malloc(*imprint_len)) == NULL) {
|
---|
| 521 | TSerr(TS_F_TS_COMPUTE_IMPRINT, ERR_R_MALLOC_FAILURE);
|
---|
| 522 | goto err;
|
---|
| 523 | }
|
---|
| 524 |
|
---|
| 525 | md_ctx = EVP_MD_CTX_new();
|
---|
| 526 | if (md_ctx == NULL) {
|
---|
| 527 | TSerr(TS_F_TS_COMPUTE_IMPRINT, ERR_R_MALLOC_FAILURE);
|
---|
| 528 | goto err;
|
---|
| 529 | }
|
---|
| 530 | if (!EVP_DigestInit(md_ctx, md))
|
---|
| 531 | goto err;
|
---|
| 532 | while ((length = BIO_read(data, buffer, sizeof(buffer))) > 0) {
|
---|
| 533 | if (!EVP_DigestUpdate(md_ctx, buffer, length))
|
---|
| 534 | goto err;
|
---|
| 535 | }
|
---|
| 536 | if (!EVP_DigestFinal(md_ctx, *imprint, NULL))
|
---|
| 537 | goto err;
|
---|
| 538 | EVP_MD_CTX_free(md_ctx);
|
---|
| 539 |
|
---|
| 540 | return 1;
|
---|
| 541 | err:
|
---|
| 542 | EVP_MD_CTX_free(md_ctx);
|
---|
| 543 | X509_ALGOR_free(*md_alg);
|
---|
| 544 | OPENSSL_free(*imprint);
|
---|
| 545 | *imprint_len = 0;
|
---|
| 546 | *imprint = 0;
|
---|
| 547 | return 0;
|
---|
| 548 | }
|
---|
| 549 |
|
---|
| 550 | static int ts_check_imprints(X509_ALGOR *algor_a,
|
---|
| 551 | const unsigned char *imprint_a, unsigned len_a,
|
---|
| 552 | TS_TST_INFO *tst_info)
|
---|
| 553 | {
|
---|
| 554 | TS_MSG_IMPRINT *b = tst_info->msg_imprint;
|
---|
| 555 | X509_ALGOR *algor_b = b->hash_algo;
|
---|
| 556 | int ret = 0;
|
---|
| 557 |
|
---|
| 558 | if (algor_a) {
|
---|
| 559 | if (OBJ_cmp(algor_a->algorithm, algor_b->algorithm))
|
---|
| 560 | goto err;
|
---|
| 561 |
|
---|
| 562 | /* The parameter must be NULL in both. */
|
---|
| 563 | if ((algor_a->parameter
|
---|
| 564 | && ASN1_TYPE_get(algor_a->parameter) != V_ASN1_NULL)
|
---|
| 565 | || (algor_b->parameter
|
---|
| 566 | && ASN1_TYPE_get(algor_b->parameter) != V_ASN1_NULL))
|
---|
| 567 | goto err;
|
---|
| 568 | }
|
---|
| 569 |
|
---|
| 570 | ret = len_a == (unsigned)ASN1_STRING_length(b->hashed_msg) &&
|
---|
| 571 | memcmp(imprint_a, ASN1_STRING_get0_data(b->hashed_msg), len_a) == 0;
|
---|
| 572 | err:
|
---|
| 573 | if (!ret)
|
---|
| 574 | TSerr(TS_F_TS_CHECK_IMPRINTS, TS_R_MESSAGE_IMPRINT_MISMATCH);
|
---|
| 575 | return ret;
|
---|
| 576 | }
|
---|
| 577 |
|
---|
| 578 | static int ts_check_nonces(const ASN1_INTEGER *a, TS_TST_INFO *tst_info)
|
---|
| 579 | {
|
---|
| 580 | const ASN1_INTEGER *b = tst_info->nonce;
|
---|
| 581 |
|
---|
| 582 | if (!b) {
|
---|
| 583 | TSerr(TS_F_TS_CHECK_NONCES, TS_R_NONCE_NOT_RETURNED);
|
---|
| 584 | return 0;
|
---|
| 585 | }
|
---|
| 586 |
|
---|
| 587 | /* No error if a nonce is returned without being requested. */
|
---|
| 588 | if (ASN1_INTEGER_cmp(a, b) != 0) {
|
---|
| 589 | TSerr(TS_F_TS_CHECK_NONCES, TS_R_NONCE_MISMATCH);
|
---|
| 590 | return 0;
|
---|
| 591 | }
|
---|
| 592 |
|
---|
| 593 | return 1;
|
---|
| 594 | }
|
---|
| 595 |
|
---|
| 596 | /*
|
---|
| 597 | * Check if the specified TSA name matches either the subject or one of the
|
---|
| 598 | * subject alternative names of the TSA certificate.
|
---|
| 599 | */
|
---|
| 600 | static int ts_check_signer_name(GENERAL_NAME *tsa_name, X509 *signer)
|
---|
| 601 | {
|
---|
| 602 | STACK_OF(GENERAL_NAME) *gen_names = NULL;
|
---|
| 603 | int idx = -1;
|
---|
| 604 | int found = 0;
|
---|
| 605 |
|
---|
| 606 | if (tsa_name->type == GEN_DIRNAME
|
---|
| 607 | && X509_name_cmp(tsa_name->d.dirn, X509_get_subject_name(signer)) == 0)
|
---|
| 608 | return 1;
|
---|
| 609 | gen_names = X509_get_ext_d2i(signer, NID_subject_alt_name, NULL, &idx);
|
---|
| 610 | while (gen_names != NULL) {
|
---|
| 611 | found = ts_find_name(gen_names, tsa_name) >= 0;
|
---|
| 612 | if (found)
|
---|
| 613 | break;
|
---|
| 614 | /*
|
---|
| 615 | * Get the next subject alternative name, although there should be no
|
---|
| 616 | * more than one.
|
---|
| 617 | */
|
---|
| 618 | GENERAL_NAMES_free(gen_names);
|
---|
| 619 | gen_names = X509_get_ext_d2i(signer, NID_subject_alt_name, NULL, &idx);
|
---|
| 620 | }
|
---|
| 621 | GENERAL_NAMES_free(gen_names);
|
---|
| 622 |
|
---|
| 623 | return found;
|
---|
| 624 | }
|
---|
| 625 |
|
---|
| 626 | /* Returns 1 if name is in gen_names, 0 otherwise. */
|
---|
| 627 | static int ts_find_name(STACK_OF(GENERAL_NAME) *gen_names, GENERAL_NAME *name)
|
---|
| 628 | {
|
---|
| 629 | int i, found;
|
---|
| 630 | for (i = 0, found = 0; !found && i < sk_GENERAL_NAME_num(gen_names); ++i) {
|
---|
| 631 | GENERAL_NAME *current = sk_GENERAL_NAME_value(gen_names, i);
|
---|
| 632 | found = GENERAL_NAME_cmp(current, name) == 0;
|
---|
| 633 | }
|
---|
| 634 | return found ? i - 1 : -1;
|
---|
| 635 | }
|
---|