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- /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
- * All rights reserved.
- *
- * This package is an SSL implementation written
- * by Eric Young (eay@cryptsoft.com).
- * The implementation was written so as to conform with Netscapes SSL.
- *
- * This library is free for commercial and non-commercial use as long as
- * the following conditions are aheared to. The following conditions
- * apply to all code found in this distribution, be it the RC4, RSA,
- * lhash, DES, etc., code; not just the SSL code. The SSL documentation
- * included with this distribution is covered by the same copyright terms
- * except that the holder is Tim Hudson (tjh@cryptsoft.com).
- *
- * Copyright remains Eric Young's, and as such any Copyright notices in
- * the code are not to be removed.
- * If this package is used in a product, Eric Young should be given attribution
- * as the author of the parts of the library used.
- * This can be in the form of a textual message at program startup or
- * in documentation (online or textual) provided with the package.
- *
- * 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 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 acknowledgement:
- * "This product includes cryptographic software written by
- * Eric Young (eay@cryptsoft.com)"
- * The word 'cryptographic' can be left out if the rouines from the library
- * being used are not cryptographic related :-).
- * 4. If you include any Windows specific code (or a derivative thereof) from
- * the apps directory (application code) you must include an acknowledgement:
- * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
- *
- * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
- * ANY EXPRESS 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 AUTHOR OR 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.
- *
- * The licence and distribution terms for any publically available version or
- * derivative of this code cannot be changed. i.e. this code cannot simply be
- * copied and put under another distribution licence
- * [including the GNU Public Licence.]
- */
- /* ====================================================================
- * Copyright (c) 1998-2007 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
- * openssl-core@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).
- *
- */
- /* ====================================================================
- * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
- * ECC cipher suite support in OpenSSL originally developed by
- * SUN MICROSYSTEMS, INC., and contributed to the OpenSSL project. */
-
- #include <openssl/ssl.h>
-
- #include <assert.h>
- #include <limits.h>
- #include <string.h>
-
- #include <utility>
-
- #include <openssl/bn.h>
- #include <openssl/buf.h>
- #include <openssl/bytestring.h>
- #include <openssl/ec_key.h>
- #include <openssl/err.h>
- #include <openssl/mem.h>
- #include <openssl/sha.h>
- #include <openssl/x509.h>
-
- #include "../crypto/internal.h"
- #include "internal.h"
-
-
- namespace bssl {
-
- CERT::CERT(const SSL_X509_METHOD *x509_method_arg)
- : x509_method(x509_method_arg), enable_early_data(false) {}
-
- CERT::~CERT() {
- ssl_cert_clear_certs(this);
- x509_method->cert_free(this);
- }
-
- static CRYPTO_BUFFER *buffer_up_ref(CRYPTO_BUFFER *buffer) {
- CRYPTO_BUFFER_up_ref(buffer);
- return buffer;
- }
-
- UniquePtr<CERT> ssl_cert_dup(CERT *cert) {
- UniquePtr<CERT> ret = MakeUnique<CERT>(cert->x509_method);
- if (!ret) {
- return nullptr;
- }
-
- if (cert->chain) {
- ret->chain.reset(sk_CRYPTO_BUFFER_deep_copy(
- cert->chain.get(), buffer_up_ref, CRYPTO_BUFFER_free));
- if (!ret->chain) {
- return nullptr;
- }
- }
-
- if (cert->privatekey) {
- EVP_PKEY_up_ref(cert->privatekey.get());
- ret->privatekey.reset(cert->privatekey.get());
- }
-
- ret->key_method = cert->key_method;
-
- if (!ret->sigalgs.CopyFrom(cert->sigalgs)) {
- return nullptr;
- }
-
- ret->cert_cb = cert->cert_cb;
- ret->cert_cb_arg = cert->cert_cb_arg;
-
- ret->x509_method->cert_dup(ret.get(), cert);
-
- if (cert->signed_cert_timestamp_list) {
- CRYPTO_BUFFER_up_ref(cert->signed_cert_timestamp_list.get());
- ret->signed_cert_timestamp_list.reset(
- cert->signed_cert_timestamp_list.get());
- }
-
- if (cert->ocsp_response) {
- CRYPTO_BUFFER_up_ref(cert->ocsp_response.get());
- ret->ocsp_response.reset(cert->ocsp_response.get());
- }
-
- ret->sid_ctx_length = cert->sid_ctx_length;
- OPENSSL_memcpy(ret->sid_ctx, cert->sid_ctx, sizeof(ret->sid_ctx));
-
- ret->enable_early_data = cert->enable_early_data;
-
- return ret;
- }
-
- // Free up and clear all certificates and chains
- void ssl_cert_clear_certs(CERT *cert) {
- if (cert == NULL) {
- return;
- }
-
- cert->x509_method->cert_clear(cert);
-
- cert->chain.reset();
- cert->privatekey.reset();
- cert->key_method = nullptr;
- }
-
- static void ssl_cert_set_cert_cb(CERT *cert, int (*cb)(SSL *ssl, void *arg),
- void *arg) {
- cert->cert_cb = cb;
- cert->cert_cb_arg = arg;
- }
-
- enum leaf_cert_and_privkey_result_t {
- leaf_cert_and_privkey_error,
- leaf_cert_and_privkey_ok,
- leaf_cert_and_privkey_mismatch,
- };
-
- // check_leaf_cert_and_privkey checks whether the certificate in |leaf_buffer|
- // and the private key in |privkey| are suitable and coherent. It returns
- // |leaf_cert_and_privkey_error| and pushes to the error queue if a problem is
- // found. If the certificate and private key are valid, but incoherent, it
- // returns |leaf_cert_and_privkey_mismatch|. Otherwise it returns
- // |leaf_cert_and_privkey_ok|.
- static enum leaf_cert_and_privkey_result_t check_leaf_cert_and_privkey(
- CRYPTO_BUFFER *leaf_buffer, EVP_PKEY *privkey) {
- CBS cert_cbs;
- CRYPTO_BUFFER_init_CBS(leaf_buffer, &cert_cbs);
- UniquePtr<EVP_PKEY> pubkey = ssl_cert_parse_pubkey(&cert_cbs);
- if (!pubkey) {
- OPENSSL_PUT_ERROR(SSL, SSL_R_DECODE_ERROR);
- return leaf_cert_and_privkey_error;
- }
-
- if (!ssl_is_key_type_supported(pubkey->type)) {
- OPENSSL_PUT_ERROR(SSL, SSL_R_UNKNOWN_CERTIFICATE_TYPE);
- return leaf_cert_and_privkey_error;
- }
-
- // An ECC certificate may be usable for ECDH or ECDSA. We only support ECDSA
- // certificates, so sanity-check the key usage extension.
- if (pubkey->type == EVP_PKEY_EC &&
- !ssl_cert_check_digital_signature_key_usage(&cert_cbs)) {
- OPENSSL_PUT_ERROR(SSL, SSL_R_UNKNOWN_CERTIFICATE_TYPE);
- return leaf_cert_and_privkey_error;
- }
-
- if (privkey != NULL &&
- // Sanity-check that the private key and the certificate match.
- !ssl_compare_public_and_private_key(pubkey.get(), privkey)) {
- ERR_clear_error();
- return leaf_cert_and_privkey_mismatch;
- }
-
- return leaf_cert_and_privkey_ok;
- }
-
- static int cert_set_chain_and_key(
- CERT *cert, CRYPTO_BUFFER *const *certs, size_t num_certs,
- EVP_PKEY *privkey, const SSL_PRIVATE_KEY_METHOD *privkey_method) {
- if (num_certs == 0 ||
- (privkey == NULL && privkey_method == NULL)) {
- OPENSSL_PUT_ERROR(SSL, ERR_R_PASSED_NULL_PARAMETER);
- return 0;
- }
-
- if (privkey != NULL && privkey_method != NULL) {
- OPENSSL_PUT_ERROR(SSL, SSL_R_CANNOT_HAVE_BOTH_PRIVKEY_AND_METHOD);
- return 0;
- }
-
- switch (check_leaf_cert_and_privkey(certs[0], privkey)) {
- case leaf_cert_and_privkey_error:
- return 0;
- case leaf_cert_and_privkey_mismatch:
- OPENSSL_PUT_ERROR(SSL, SSL_R_CERTIFICATE_AND_PRIVATE_KEY_MISMATCH);
- return 0;
- case leaf_cert_and_privkey_ok:
- break;
- }
-
- UniquePtr<STACK_OF(CRYPTO_BUFFER)> certs_sk(sk_CRYPTO_BUFFER_new_null());
- if (!certs_sk) {
- return 0;
- }
-
- for (size_t i = 0; i < num_certs; i++) {
- if (!sk_CRYPTO_BUFFER_push(certs_sk.get(), certs[i])) {
- return 0;
- }
- CRYPTO_BUFFER_up_ref(certs[i]);
- }
-
- if (privkey != nullptr) {
- EVP_PKEY_up_ref(privkey);
- }
- cert->privatekey.reset(privkey);
- cert->key_method = privkey_method;
-
- cert->chain = std::move(certs_sk);
- return 1;
- }
-
- int ssl_set_cert(CERT *cert, UniquePtr<CRYPTO_BUFFER> buffer) {
- switch (check_leaf_cert_and_privkey(buffer.get(), cert->privatekey.get())) {
- case leaf_cert_and_privkey_error:
- return 0;
- case leaf_cert_and_privkey_mismatch:
- // don't fail for a cert/key mismatch, just free current private key
- // (when switching to a different cert & key, first this function should
- // be used, then |ssl_set_pkey|.
- cert->privatekey.reset();
- break;
- case leaf_cert_and_privkey_ok:
- break;
- }
-
- cert->x509_method->cert_flush_cached_leaf(cert);
-
- if (cert->chain != nullptr) {
- CRYPTO_BUFFER_free(sk_CRYPTO_BUFFER_value(cert->chain.get(), 0));
- sk_CRYPTO_BUFFER_set(cert->chain.get(), 0, buffer.release());
- return 1;
- }
-
- cert->chain.reset(sk_CRYPTO_BUFFER_new_null());
- if (cert->chain == nullptr) {
- return 0;
- }
-
- if (!PushToStack(cert->chain.get(), std::move(buffer))) {
- cert->chain.reset();
- return 0;
- }
-
- return 1;
- }
-
- int ssl_has_certificate(const SSL *ssl) {
- return ssl->cert->chain != nullptr &&
- sk_CRYPTO_BUFFER_value(ssl->cert->chain.get(), 0) != nullptr &&
- ssl_has_private_key(ssl);
- }
-
- bool ssl_parse_cert_chain(uint8_t *out_alert,
- UniquePtr<STACK_OF(CRYPTO_BUFFER)> *out_chain,
- UniquePtr<EVP_PKEY> *out_pubkey,
- uint8_t *out_leaf_sha256, CBS *cbs,
- CRYPTO_BUFFER_POOL *pool) {
- out_chain->reset();
- out_pubkey->reset();
-
- CBS certificate_list;
- if (!CBS_get_u24_length_prefixed(cbs, &certificate_list)) {
- *out_alert = SSL_AD_DECODE_ERROR;
- OPENSSL_PUT_ERROR(SSL, SSL_R_DECODE_ERROR);
- return false;
- }
-
- if (CBS_len(&certificate_list) == 0) {
- return true;
- }
-
- UniquePtr<STACK_OF(CRYPTO_BUFFER)> chain(sk_CRYPTO_BUFFER_new_null());
- if (!chain) {
- *out_alert = SSL_AD_INTERNAL_ERROR;
- OPENSSL_PUT_ERROR(SSL, ERR_R_MALLOC_FAILURE);
- return false;
- }
-
- UniquePtr<EVP_PKEY> pubkey;
- while (CBS_len(&certificate_list) > 0) {
- CBS certificate;
- if (!CBS_get_u24_length_prefixed(&certificate_list, &certificate) ||
- CBS_len(&certificate) == 0) {
- *out_alert = SSL_AD_DECODE_ERROR;
- OPENSSL_PUT_ERROR(SSL, SSL_R_CERT_LENGTH_MISMATCH);
- return false;
- }
-
- if (sk_CRYPTO_BUFFER_num(chain.get()) == 0) {
- pubkey = ssl_cert_parse_pubkey(&certificate);
- if (!pubkey) {
- *out_alert = SSL_AD_DECODE_ERROR;
- return false;
- }
-
- // Retain the hash of the leaf certificate if requested.
- if (out_leaf_sha256 != NULL) {
- SHA256(CBS_data(&certificate), CBS_len(&certificate), out_leaf_sha256);
- }
- }
-
- UniquePtr<CRYPTO_BUFFER> buf(
- CRYPTO_BUFFER_new_from_CBS(&certificate, pool));
- if (!buf ||
- !PushToStack(chain.get(), std::move(buf))) {
- *out_alert = SSL_AD_INTERNAL_ERROR;
- OPENSSL_PUT_ERROR(SSL, ERR_R_MALLOC_FAILURE);
- return false;
- }
- }
-
- *out_chain = std::move(chain);
- *out_pubkey = std::move(pubkey);
- return true;
- }
-
- int ssl_add_cert_chain(SSL *ssl, CBB *cbb) {
- if (!ssl_has_certificate(ssl)) {
- return CBB_add_u24(cbb, 0);
- }
-
- CBB certs;
- if (!CBB_add_u24_length_prefixed(cbb, &certs)) {
- OPENSSL_PUT_ERROR(SSL, ERR_R_INTERNAL_ERROR);
- return 0;
- }
-
- STACK_OF(CRYPTO_BUFFER) *chain = ssl->cert->chain.get();
- for (size_t i = 0; i < sk_CRYPTO_BUFFER_num(chain); i++) {
- CRYPTO_BUFFER *buffer = sk_CRYPTO_BUFFER_value(chain, i);
- CBB child;
- if (!CBB_add_u24_length_prefixed(&certs, &child) ||
- !CBB_add_bytes(&child, CRYPTO_BUFFER_data(buffer),
- CRYPTO_BUFFER_len(buffer)) ||
- !CBB_flush(&certs)) {
- OPENSSL_PUT_ERROR(SSL, ERR_R_INTERNAL_ERROR);
- return 0;
- }
- }
-
- return CBB_flush(cbb);
- }
-
- // ssl_cert_skip_to_spki parses a DER-encoded, X.509 certificate from |in| and
- // positions |*out_tbs_cert| to cover the TBSCertificate, starting at the
- // subjectPublicKeyInfo.
- static int ssl_cert_skip_to_spki(const CBS *in, CBS *out_tbs_cert) {
- /* From RFC 5280, section 4.1
- * Certificate ::= SEQUENCE {
- * tbsCertificate TBSCertificate,
- * signatureAlgorithm AlgorithmIdentifier,
- * signatureValue BIT STRING }
-
- * TBSCertificate ::= SEQUENCE {
- * version [0] EXPLICIT Version DEFAULT v1,
- * serialNumber CertificateSerialNumber,
- * signature AlgorithmIdentifier,
- * issuer Name,
- * validity Validity,
- * subject Name,
- * subjectPublicKeyInfo SubjectPublicKeyInfo,
- * ... } */
- CBS buf = *in;
-
- CBS toplevel;
- if (!CBS_get_asn1(&buf, &toplevel, CBS_ASN1_SEQUENCE) ||
- CBS_len(&buf) != 0 ||
- !CBS_get_asn1(&toplevel, out_tbs_cert, CBS_ASN1_SEQUENCE) ||
- // version
- !CBS_get_optional_asn1(
- out_tbs_cert, NULL, NULL,
- CBS_ASN1_CONSTRUCTED | CBS_ASN1_CONTEXT_SPECIFIC | 0) ||
- // serialNumber
- !CBS_get_asn1(out_tbs_cert, NULL, CBS_ASN1_INTEGER) ||
- // signature algorithm
- !CBS_get_asn1(out_tbs_cert, NULL, CBS_ASN1_SEQUENCE) ||
- // issuer
- !CBS_get_asn1(out_tbs_cert, NULL, CBS_ASN1_SEQUENCE) ||
- // validity
- !CBS_get_asn1(out_tbs_cert, NULL, CBS_ASN1_SEQUENCE) ||
- // subject
- !CBS_get_asn1(out_tbs_cert, NULL, CBS_ASN1_SEQUENCE)) {
- return 0;
- }
-
- return 1;
- }
-
- UniquePtr<EVP_PKEY> ssl_cert_parse_pubkey(const CBS *in) {
- CBS buf = *in, tbs_cert;
- if (!ssl_cert_skip_to_spki(&buf, &tbs_cert)) {
- OPENSSL_PUT_ERROR(SSL, SSL_R_CANNOT_PARSE_LEAF_CERT);
- return nullptr;
- }
-
- return UniquePtr<EVP_PKEY>(EVP_parse_public_key(&tbs_cert));
- }
-
- int ssl_compare_public_and_private_key(const EVP_PKEY *pubkey,
- const EVP_PKEY *privkey) {
- if (EVP_PKEY_is_opaque(privkey)) {
- // We cannot check an opaque private key and have to trust that it
- // matches.
- return 1;
- }
-
- int ret = 0;
-
- switch (EVP_PKEY_cmp(pubkey, privkey)) {
- case 1:
- ret = 1;
- break;
- case 0:
- OPENSSL_PUT_ERROR(X509, X509_R_KEY_VALUES_MISMATCH);
- break;
- case -1:
- OPENSSL_PUT_ERROR(X509, X509_R_KEY_TYPE_MISMATCH);
- break;
- case -2:
- OPENSSL_PUT_ERROR(X509, X509_R_UNKNOWN_KEY_TYPE);
- break;
- default:
- assert(0);
- break;
- }
-
- return ret;
- }
-
- int ssl_cert_check_private_key(const CERT *cert, const EVP_PKEY *privkey) {
- if (privkey == nullptr) {
- OPENSSL_PUT_ERROR(SSL, SSL_R_NO_PRIVATE_KEY_ASSIGNED);
- return 0;
- }
-
- if (cert->chain == nullptr ||
- sk_CRYPTO_BUFFER_value(cert->chain.get(), 0) == nullptr) {
- OPENSSL_PUT_ERROR(SSL, SSL_R_NO_CERTIFICATE_ASSIGNED);
- return 0;
- }
-
- CBS cert_cbs;
- CRYPTO_BUFFER_init_CBS(sk_CRYPTO_BUFFER_value(cert->chain.get(), 0),
- &cert_cbs);
- UniquePtr<EVP_PKEY> pubkey = ssl_cert_parse_pubkey(&cert_cbs);
- if (!pubkey) {
- OPENSSL_PUT_ERROR(X509, X509_R_UNKNOWN_KEY_TYPE);
- return 0;
- }
-
- return ssl_compare_public_and_private_key(pubkey.get(), privkey);
- }
-
- int ssl_cert_check_digital_signature_key_usage(const CBS *in) {
- CBS buf = *in;
-
- CBS tbs_cert, outer_extensions;
- int has_extensions;
- if (!ssl_cert_skip_to_spki(&buf, &tbs_cert) ||
- // subjectPublicKeyInfo
- !CBS_get_asn1(&tbs_cert, NULL, CBS_ASN1_SEQUENCE) ||
- // issuerUniqueID
- !CBS_get_optional_asn1(
- &tbs_cert, NULL, NULL,
- CBS_ASN1_CONSTRUCTED | CBS_ASN1_CONTEXT_SPECIFIC | 1) ||
- // subjectUniqueID
- !CBS_get_optional_asn1(
- &tbs_cert, NULL, NULL,
- CBS_ASN1_CONSTRUCTED | CBS_ASN1_CONTEXT_SPECIFIC | 2) ||
- !CBS_get_optional_asn1(
- &tbs_cert, &outer_extensions, &has_extensions,
- CBS_ASN1_CONSTRUCTED | CBS_ASN1_CONTEXT_SPECIFIC | 3)) {
- OPENSSL_PUT_ERROR(SSL, SSL_R_CANNOT_PARSE_LEAF_CERT);
- return 0;
- }
-
- if (!has_extensions) {
- return 1;
- }
-
- CBS extensions;
- if (!CBS_get_asn1(&outer_extensions, &extensions, CBS_ASN1_SEQUENCE)) {
- OPENSSL_PUT_ERROR(SSL, SSL_R_CANNOT_PARSE_LEAF_CERT);
- return 0;
- }
-
- while (CBS_len(&extensions) > 0) {
- CBS extension, oid, contents;
- if (!CBS_get_asn1(&extensions, &extension, CBS_ASN1_SEQUENCE) ||
- !CBS_get_asn1(&extension, &oid, CBS_ASN1_OBJECT) ||
- (CBS_peek_asn1_tag(&extension, CBS_ASN1_BOOLEAN) &&
- !CBS_get_asn1(&extension, NULL, CBS_ASN1_BOOLEAN)) ||
- !CBS_get_asn1(&extension, &contents, CBS_ASN1_OCTETSTRING) ||
- CBS_len(&extension) != 0) {
- OPENSSL_PUT_ERROR(SSL, SSL_R_CANNOT_PARSE_LEAF_CERT);
- return 0;
- }
-
- static const uint8_t kKeyUsageOID[3] = {0x55, 0x1d, 0x0f};
- if (CBS_len(&oid) != sizeof(kKeyUsageOID) ||
- OPENSSL_memcmp(CBS_data(&oid), kKeyUsageOID, sizeof(kKeyUsageOID)) !=
- 0) {
- continue;
- }
-
- CBS bit_string;
- if (!CBS_get_asn1(&contents, &bit_string, CBS_ASN1_BITSTRING) ||
- CBS_len(&contents) != 0) {
- OPENSSL_PUT_ERROR(SSL, SSL_R_CANNOT_PARSE_LEAF_CERT);
- return 0;
- }
-
- // This is the KeyUsage extension. See
- // https://tools.ietf.org/html/rfc5280#section-4.2.1.3
- if (!CBS_is_valid_asn1_bitstring(&bit_string)) {
- OPENSSL_PUT_ERROR(SSL, SSL_R_CANNOT_PARSE_LEAF_CERT);
- return 0;
- }
-
- if (!CBS_asn1_bitstring_has_bit(&bit_string, 0)) {
- OPENSSL_PUT_ERROR(SSL, SSL_R_ECC_CERT_NOT_FOR_SIGNING);
- return 0;
- }
-
- return 1;
- }
-
- // No KeyUsage extension found.
- return 1;
- }
-
- UniquePtr<STACK_OF(CRYPTO_BUFFER)> ssl_parse_client_CA_list(SSL *ssl,
- uint8_t *out_alert,
- CBS *cbs) {
- CRYPTO_BUFFER_POOL *const pool = ssl->ctx->pool;
-
- UniquePtr<STACK_OF(CRYPTO_BUFFER)> ret(sk_CRYPTO_BUFFER_new_null());
- if (!ret) {
- *out_alert = SSL_AD_INTERNAL_ERROR;
- OPENSSL_PUT_ERROR(SSL, ERR_R_MALLOC_FAILURE);
- return nullptr;
- }
-
- CBS child;
- if (!CBS_get_u16_length_prefixed(cbs, &child)) {
- *out_alert = SSL_AD_DECODE_ERROR;
- OPENSSL_PUT_ERROR(SSL, SSL_R_LENGTH_MISMATCH);
- return nullptr;
- }
-
- while (CBS_len(&child) > 0) {
- CBS distinguished_name;
- if (!CBS_get_u16_length_prefixed(&child, &distinguished_name)) {
- *out_alert = SSL_AD_DECODE_ERROR;
- OPENSSL_PUT_ERROR(SSL, SSL_R_CA_DN_TOO_LONG);
- return nullptr;
- }
-
- UniquePtr<CRYPTO_BUFFER> buffer(
- CRYPTO_BUFFER_new_from_CBS(&distinguished_name, pool));
- if (!buffer ||
- !PushToStack(ret.get(), std::move(buffer))) {
- *out_alert = SSL_AD_INTERNAL_ERROR;
- OPENSSL_PUT_ERROR(SSL, ERR_R_MALLOC_FAILURE);
- return nullptr;
- }
- }
-
- if (!ssl->ctx->x509_method->check_client_CA_list(ret.get())) {
- *out_alert = SSL_AD_INTERNAL_ERROR;
- OPENSSL_PUT_ERROR(SSL, SSL_R_DECODE_ERROR);
- return nullptr;
- }
-
- return ret;
- }
-
- bool ssl_has_client_CAs(SSL *ssl) {
- STACK_OF(CRYPTO_BUFFER) *names = ssl->client_CA;
- if (names == NULL) {
- names = ssl->ctx->client_CA;
- }
- if (names == NULL) {
- return false;
- }
- return sk_CRYPTO_BUFFER_num(names) > 0;
- }
-
- int ssl_add_client_CA_list(SSL *ssl, CBB *cbb) {
- CBB child, name_cbb;
- if (!CBB_add_u16_length_prefixed(cbb, &child)) {
- return 0;
- }
-
- STACK_OF(CRYPTO_BUFFER) *names = ssl->client_CA;
- if (names == NULL) {
- names = ssl->ctx->client_CA;
- }
- if (names == NULL) {
- return CBB_flush(cbb);
- }
-
- for (const CRYPTO_BUFFER *name : names) {
- if (!CBB_add_u16_length_prefixed(&child, &name_cbb) ||
- !CBB_add_bytes(&name_cbb, CRYPTO_BUFFER_data(name),
- CRYPTO_BUFFER_len(name))) {
- return 0;
- }
- }
-
- return CBB_flush(cbb);
- }
-
- int ssl_check_leaf_certificate(SSL_HANDSHAKE *hs, EVP_PKEY *pkey,
- const CRYPTO_BUFFER *leaf) {
- SSL *const ssl = hs->ssl;
- assert(ssl_protocol_version(ssl) < TLS1_3_VERSION);
-
- // Check the certificate's type matches the cipher.
- if (!(hs->new_cipher->algorithm_auth & ssl_cipher_auth_mask_for_key(pkey))) {
- OPENSSL_PUT_ERROR(SSL, SSL_R_WRONG_CERTIFICATE_TYPE);
- return 0;
- }
-
- // Check key usages for all key types but RSA. This is needed to distinguish
- // ECDH certificates, which we do not support, from ECDSA certificates. In
- // principle, we should check RSA key usages based on cipher, but this breaks
- // buggy antivirus deployments. Other key types are always used for signing.
- //
- // TODO(davidben): Get more recent data on RSA key usages.
- if (EVP_PKEY_id(pkey) != EVP_PKEY_RSA) {
- CBS leaf_cbs;
- CBS_init(&leaf_cbs, CRYPTO_BUFFER_data(leaf), CRYPTO_BUFFER_len(leaf));
- if (!ssl_cert_check_digital_signature_key_usage(&leaf_cbs)) {
- return 0;
- }
- }
-
- if (EVP_PKEY_id(pkey) == EVP_PKEY_EC) {
- // Check the key's group and point format are acceptable.
- EC_KEY *ec_key = EVP_PKEY_get0_EC_KEY(pkey);
- uint16_t group_id;
- if (!ssl_nid_to_group_id(
- &group_id, EC_GROUP_get_curve_name(EC_KEY_get0_group(ec_key))) ||
- !tls1_check_group_id(ssl, group_id) ||
- EC_KEY_get_conv_form(ec_key) != POINT_CONVERSION_UNCOMPRESSED) {
- OPENSSL_PUT_ERROR(SSL, SSL_R_BAD_ECC_CERT);
- return 0;
- }
- }
-
- return 1;
- }
-
- int ssl_on_certificate_selected(SSL_HANDSHAKE *hs) {
- SSL *const ssl = hs->ssl;
- if (!ssl_has_certificate(ssl)) {
- // Nothing to do.
- return 1;
- }
-
- if (!ssl->ctx->x509_method->ssl_auto_chain_if_needed(ssl)) {
- return 0;
- }
-
- CBS leaf;
- CRYPTO_BUFFER_init_CBS(sk_CRYPTO_BUFFER_value(ssl->cert->chain.get(), 0),
- &leaf);
-
- hs->local_pubkey = ssl_cert_parse_pubkey(&leaf);
- return hs->local_pubkey != NULL;
- }
-
- } // namespace bssl
-
- using namespace bssl;
-
- int SSL_set_chain_and_key(SSL *ssl, CRYPTO_BUFFER *const *certs,
- size_t num_certs, EVP_PKEY *privkey,
- const SSL_PRIVATE_KEY_METHOD *privkey_method) {
- return cert_set_chain_and_key(ssl->cert, certs, num_certs, privkey,
- privkey_method);
- }
-
- int SSL_CTX_set_chain_and_key(SSL_CTX *ctx, CRYPTO_BUFFER *const *certs,
- size_t num_certs, EVP_PKEY *privkey,
- const SSL_PRIVATE_KEY_METHOD *privkey_method) {
- return cert_set_chain_and_key(ctx->cert, certs, num_certs, privkey,
- privkey_method);
- }
-
- int SSL_CTX_use_certificate_ASN1(SSL_CTX *ctx, size_t der_len,
- const uint8_t *der) {
- UniquePtr<CRYPTO_BUFFER> buffer(CRYPTO_BUFFER_new(der, der_len, NULL));
- if (!buffer) {
- return 0;
- }
-
- return ssl_set_cert(ctx->cert, std::move(buffer));
- }
-
- int SSL_use_certificate_ASN1(SSL *ssl, const uint8_t *der, size_t der_len) {
- UniquePtr<CRYPTO_BUFFER> buffer(CRYPTO_BUFFER_new(der, der_len, NULL));
- if (!buffer) {
- return 0;
- }
-
- return ssl_set_cert(ssl->cert, std::move(buffer));
- }
-
- void SSL_CTX_set_cert_cb(SSL_CTX *ctx, int (*cb)(SSL *ssl, void *arg),
- void *arg) {
- ssl_cert_set_cert_cb(ctx->cert, cb, arg);
- }
-
- void SSL_set_cert_cb(SSL *ssl, int (*cb)(SSL *ssl, void *arg), void *arg) {
- ssl_cert_set_cert_cb(ssl->cert, cb, arg);
- }
-
- STACK_OF(CRYPTO_BUFFER) *SSL_get0_peer_certificates(const SSL *ssl) {
- SSL_SESSION *session = SSL_get_session(ssl);
- if (session == NULL) {
- return NULL;
- }
-
- return session->certs;
- }
-
- STACK_OF(CRYPTO_BUFFER) *SSL_get0_server_requested_CAs(const SSL *ssl) {
- if (ssl->s3->hs == NULL) {
- return NULL;
- }
- return ssl->s3->hs->ca_names.get();
- }
-
- static int set_signed_cert_timestamp_list(CERT *cert, const uint8_t *list,
- size_t list_len) {
- CBS sct_list;
- CBS_init(&sct_list, list, list_len);
- if (!ssl_is_sct_list_valid(&sct_list)) {
- OPENSSL_PUT_ERROR(SSL, SSL_R_INVALID_SCT_LIST);
- return 0;
- }
-
- cert->signed_cert_timestamp_list.reset(
- CRYPTO_BUFFER_new(CBS_data(&sct_list), CBS_len(&sct_list), nullptr));
- return cert->signed_cert_timestamp_list != nullptr;
- }
-
- int SSL_CTX_set_signed_cert_timestamp_list(SSL_CTX *ctx, const uint8_t *list,
- size_t list_len) {
- return set_signed_cert_timestamp_list(ctx->cert, list, list_len);
- }
-
- int SSL_set_signed_cert_timestamp_list(SSL *ssl, const uint8_t *list,
- size_t list_len) {
- return set_signed_cert_timestamp_list(ssl->cert, list, list_len);
- }
-
- int SSL_CTX_set_ocsp_response(SSL_CTX *ctx, const uint8_t *response,
- size_t response_len) {
- ctx->cert->ocsp_response.reset(
- CRYPTO_BUFFER_new(response, response_len, nullptr));
- return ctx->cert->ocsp_response != nullptr;
- }
-
- int SSL_set_ocsp_response(SSL *ssl, const uint8_t *response,
- size_t response_len) {
- ssl->cert->ocsp_response.reset(
- CRYPTO_BUFFER_new(response, response_len, nullptr));
- return ssl->cert->ocsp_response != nullptr;
- }
-
- void SSL_CTX_set0_client_CAs(SSL_CTX *ctx, STACK_OF(CRYPTO_BUFFER) *name_list) {
- ctx->x509_method->ssl_ctx_flush_cached_client_CA(ctx);
- sk_CRYPTO_BUFFER_pop_free(ctx->client_CA, CRYPTO_BUFFER_free);
- ctx->client_CA = name_list;
- }
-
- void SSL_set0_client_CAs(SSL *ssl, STACK_OF(CRYPTO_BUFFER) *name_list) {
- ssl->ctx->x509_method->ssl_flush_cached_client_CA(ssl);
- sk_CRYPTO_BUFFER_pop_free(ssl->client_CA, CRYPTO_BUFFER_free);
- ssl->client_CA = name_list;
- }
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