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1016 lines
32 KiB
C++
1016 lines
32 KiB
C++
/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
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* All rights reserved.
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*
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* This package is an SSL implementation written
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* by Eric Young (eay@cryptsoft.com).
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* The implementation was written so as to conform with Netscapes SSL.
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*
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* This library is free for commercial and non-commercial use as long as
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* the following conditions are aheared to. The following conditions
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* apply to all code found in this distribution, be it the RC4, RSA,
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* lhash, DES, etc., code; not just the SSL code. The SSL documentation
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* included with this distribution is covered by the same copyright terms
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* except that the holder is Tim Hudson (tjh@cryptsoft.com).
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*
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* Copyright remains Eric Young's, and as such any Copyright notices in
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* the code are not to be removed.
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* If this package is used in a product, Eric Young should be given attribution
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* as the author of the parts of the library used.
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* This can be in the form of a textual message at program startup or
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* in documentation (online or textual) provided with the package.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* "This product includes cryptographic software written by
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* Eric Young (eay@cryptsoft.com)"
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* The word 'cryptographic' can be left out if the rouines from the library
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* being used are not cryptographic related :-).
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* 4. If you include any Windows specific code (or a derivative thereof) from
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* the apps directory (application code) you must include an acknowledgement:
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* "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
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*
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* THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* The licence and distribution terms for any publically available version or
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* derivative of this code cannot be changed. i.e. this code cannot simply be
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* copied and put under another distribution licence
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* [including the GNU Public Licence.]
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*/
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/* ====================================================================
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* Copyright (c) 1998-2007 The OpenSSL Project. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* 3. All advertising materials mentioning features or use of this
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* software must display the following acknowledgment:
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* "This product includes software developed by the OpenSSL Project
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* for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
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*
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* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
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* endorse or promote products derived from this software without
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* prior written permission. For written permission, please contact
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* openssl-core@openssl.org.
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*
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* 5. Products derived from this software may not be called "OpenSSL"
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* nor may "OpenSSL" appear in their names without prior written
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* permission of the OpenSSL Project.
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*
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* 6. Redistributions of any form whatsoever must retain the following
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* acknowledgment:
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* "This product includes software developed by the OpenSSL Project
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* for use in the OpenSSL Toolkit (http://www.openssl.org/)"
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*
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* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
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* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
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* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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* ====================================================================
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*
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* This product includes cryptographic software written by Eric Young
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* (eay@cryptsoft.com). This product includes software written by Tim
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* Hudson (tjh@cryptsoft.com).
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*
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*/
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/* ====================================================================
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* Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
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* ECC cipher suite support in OpenSSL originally developed by
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* SUN MICROSYSTEMS, INC., and contributed to the OpenSSL project. */
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#include <openssl/ssl.h>
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#include <assert.h>
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#include <limits.h>
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#include <string.h>
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#include <utility>
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#include <openssl/bn.h>
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#include <openssl/buf.h>
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#include <openssl/bytestring.h>
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#include <openssl/ec_key.h>
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#include <openssl/err.h>
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#include <openssl/mem.h>
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#include <openssl/sha.h>
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#include <openssl/x509.h>
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#include "../crypto/internal.h"
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#include "internal.h"
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BSSL_NAMESPACE_BEGIN
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CERT::CERT(const SSL_X509_METHOD *x509_method_arg)
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: x509_method(x509_method_arg) {}
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CERT::~CERT() {
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ssl_cert_clear_certs(this);
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x509_method->cert_free(this);
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}
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static CRYPTO_BUFFER *buffer_up_ref(CRYPTO_BUFFER *buffer) {
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CRYPTO_BUFFER_up_ref(buffer);
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return buffer;
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}
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UniquePtr<CERT> ssl_cert_dup(CERT *cert) {
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UniquePtr<CERT> ret = MakeUnique<CERT>(cert->x509_method);
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if (!ret) {
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return nullptr;
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}
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if (cert->chain) {
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ret->chain.reset(sk_CRYPTO_BUFFER_deep_copy(
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cert->chain.get(), buffer_up_ref, CRYPTO_BUFFER_free));
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if (!ret->chain) {
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return nullptr;
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}
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}
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ret->privatekey = UpRef(cert->privatekey);
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ret->key_method = cert->key_method;
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if (!ret->sigalgs.CopyFrom(cert->sigalgs)) {
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return nullptr;
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}
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ret->cert_cb = cert->cert_cb;
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ret->cert_cb_arg = cert->cert_cb_arg;
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ret->x509_method->cert_dup(ret.get(), cert);
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ret->signed_cert_timestamp_list = UpRef(cert->signed_cert_timestamp_list);
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ret->ocsp_response = UpRef(cert->ocsp_response);
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ret->sid_ctx_length = cert->sid_ctx_length;
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OPENSSL_memcpy(ret->sid_ctx, cert->sid_ctx, sizeof(ret->sid_ctx));
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if (cert->dc) {
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ret->dc = cert->dc->Dup();
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if (!ret->dc) {
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return nullptr;
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}
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}
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ret->dc_privatekey = UpRef(cert->dc_privatekey);
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ret->dc_key_method = cert->dc_key_method;
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return ret;
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}
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// Free up and clear all certificates and chains
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void ssl_cert_clear_certs(CERT *cert) {
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if (cert == NULL) {
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return;
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}
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cert->x509_method->cert_clear(cert);
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cert->chain.reset();
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cert->privatekey.reset();
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cert->key_method = nullptr;
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cert->dc.reset();
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cert->dc_privatekey.reset();
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cert->dc_key_method = nullptr;
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}
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static void ssl_cert_set_cert_cb(CERT *cert, int (*cb)(SSL *ssl, void *arg),
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void *arg) {
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cert->cert_cb = cb;
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cert->cert_cb_arg = arg;
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}
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enum leaf_cert_and_privkey_result_t {
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leaf_cert_and_privkey_error,
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leaf_cert_and_privkey_ok,
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leaf_cert_and_privkey_mismatch,
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};
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// check_leaf_cert_and_privkey checks whether the certificate in |leaf_buffer|
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// and the private key in |privkey| are suitable and coherent. It returns
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// |leaf_cert_and_privkey_error| and pushes to the error queue if a problem is
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// found. If the certificate and private key are valid, but incoherent, it
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// returns |leaf_cert_and_privkey_mismatch|. Otherwise it returns
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// |leaf_cert_and_privkey_ok|.
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static enum leaf_cert_and_privkey_result_t check_leaf_cert_and_privkey(
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CRYPTO_BUFFER *leaf_buffer, EVP_PKEY *privkey) {
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CBS cert_cbs;
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CRYPTO_BUFFER_init_CBS(leaf_buffer, &cert_cbs);
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UniquePtr<EVP_PKEY> pubkey = ssl_cert_parse_pubkey(&cert_cbs);
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if (!pubkey) {
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OPENSSL_PUT_ERROR(SSL, SSL_R_DECODE_ERROR);
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return leaf_cert_and_privkey_error;
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}
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if (!ssl_is_key_type_supported(pubkey->type)) {
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OPENSSL_PUT_ERROR(SSL, SSL_R_UNKNOWN_CERTIFICATE_TYPE);
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return leaf_cert_and_privkey_error;
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}
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// An ECC certificate may be usable for ECDH or ECDSA. We only support ECDSA
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// certificates, so sanity-check the key usage extension.
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if (pubkey->type == EVP_PKEY_EC &&
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!ssl_cert_check_key_usage(&cert_cbs, key_usage_digital_signature)) {
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OPENSSL_PUT_ERROR(SSL, SSL_R_UNKNOWN_CERTIFICATE_TYPE);
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return leaf_cert_and_privkey_error;
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}
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if (privkey != NULL &&
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// Sanity-check that the private key and the certificate match.
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!ssl_compare_public_and_private_key(pubkey.get(), privkey)) {
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ERR_clear_error();
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return leaf_cert_and_privkey_mismatch;
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}
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return leaf_cert_and_privkey_ok;
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}
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static int cert_set_chain_and_key(
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CERT *cert, CRYPTO_BUFFER *const *certs, size_t num_certs,
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EVP_PKEY *privkey, const SSL_PRIVATE_KEY_METHOD *privkey_method) {
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if (num_certs == 0 ||
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(privkey == NULL && privkey_method == NULL)) {
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OPENSSL_PUT_ERROR(SSL, ERR_R_PASSED_NULL_PARAMETER);
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return 0;
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}
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if (privkey != NULL && privkey_method != NULL) {
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OPENSSL_PUT_ERROR(SSL, SSL_R_CANNOT_HAVE_BOTH_PRIVKEY_AND_METHOD);
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return 0;
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}
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switch (check_leaf_cert_and_privkey(certs[0], privkey)) {
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case leaf_cert_and_privkey_error:
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return 0;
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case leaf_cert_and_privkey_mismatch:
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OPENSSL_PUT_ERROR(SSL, SSL_R_CERTIFICATE_AND_PRIVATE_KEY_MISMATCH);
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return 0;
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case leaf_cert_and_privkey_ok:
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break;
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}
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UniquePtr<STACK_OF(CRYPTO_BUFFER)> certs_sk(sk_CRYPTO_BUFFER_new_null());
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if (!certs_sk) {
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return 0;
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}
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for (size_t i = 0; i < num_certs; i++) {
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if (!PushToStack(certs_sk.get(), UpRef(certs[i]))) {
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return 0;
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}
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}
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cert->privatekey = UpRef(privkey);
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cert->key_method = privkey_method;
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cert->chain = std::move(certs_sk);
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return 1;
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}
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bool ssl_set_cert(CERT *cert, UniquePtr<CRYPTO_BUFFER> buffer) {
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switch (check_leaf_cert_and_privkey(buffer.get(), cert->privatekey.get())) {
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case leaf_cert_and_privkey_error:
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return false;
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case leaf_cert_and_privkey_mismatch:
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// don't fail for a cert/key mismatch, just free current private key
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// (when switching to a different cert & key, first this function should
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// be used, then |ssl_set_pkey|.
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cert->privatekey.reset();
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break;
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case leaf_cert_and_privkey_ok:
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break;
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}
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cert->x509_method->cert_flush_cached_leaf(cert);
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if (cert->chain != nullptr) {
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CRYPTO_BUFFER_free(sk_CRYPTO_BUFFER_value(cert->chain.get(), 0));
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sk_CRYPTO_BUFFER_set(cert->chain.get(), 0, buffer.release());
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return true;
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}
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cert->chain.reset(sk_CRYPTO_BUFFER_new_null());
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if (cert->chain == nullptr) {
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return false;
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}
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if (!PushToStack(cert->chain.get(), std::move(buffer))) {
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cert->chain.reset();
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return false;
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}
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return true;
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}
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bool ssl_has_certificate(const SSL_HANDSHAKE *hs) {
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return hs->config->cert->chain != nullptr &&
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sk_CRYPTO_BUFFER_value(hs->config->cert->chain.get(), 0) != nullptr &&
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ssl_has_private_key(hs);
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}
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bool ssl_parse_cert_chain(uint8_t *out_alert,
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UniquePtr<STACK_OF(CRYPTO_BUFFER)> *out_chain,
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UniquePtr<EVP_PKEY> *out_pubkey,
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uint8_t *out_leaf_sha256, CBS *cbs,
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CRYPTO_BUFFER_POOL *pool) {
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out_chain->reset();
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out_pubkey->reset();
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CBS certificate_list;
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if (!CBS_get_u24_length_prefixed(cbs, &certificate_list)) {
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*out_alert = SSL_AD_DECODE_ERROR;
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OPENSSL_PUT_ERROR(SSL, SSL_R_DECODE_ERROR);
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return false;
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}
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if (CBS_len(&certificate_list) == 0) {
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return true;
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}
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UniquePtr<STACK_OF(CRYPTO_BUFFER)> chain(sk_CRYPTO_BUFFER_new_null());
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if (!chain) {
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*out_alert = SSL_AD_INTERNAL_ERROR;
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OPENSSL_PUT_ERROR(SSL, ERR_R_MALLOC_FAILURE);
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return false;
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}
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UniquePtr<EVP_PKEY> pubkey;
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while (CBS_len(&certificate_list) > 0) {
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CBS certificate;
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if (!CBS_get_u24_length_prefixed(&certificate_list, &certificate) ||
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CBS_len(&certificate) == 0) {
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*out_alert = SSL_AD_DECODE_ERROR;
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OPENSSL_PUT_ERROR(SSL, SSL_R_CERT_LENGTH_MISMATCH);
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return false;
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}
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if (sk_CRYPTO_BUFFER_num(chain.get()) == 0) {
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pubkey = ssl_cert_parse_pubkey(&certificate);
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if (!pubkey) {
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*out_alert = SSL_AD_DECODE_ERROR;
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return false;
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}
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// Retain the hash of the leaf certificate if requested.
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if (out_leaf_sha256 != NULL) {
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SHA256(CBS_data(&certificate), CBS_len(&certificate), out_leaf_sha256);
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}
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}
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UniquePtr<CRYPTO_BUFFER> buf(
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CRYPTO_BUFFER_new_from_CBS(&certificate, pool));
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if (!buf ||
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!PushToStack(chain.get(), std::move(buf))) {
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*out_alert = SSL_AD_INTERNAL_ERROR;
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OPENSSL_PUT_ERROR(SSL, ERR_R_MALLOC_FAILURE);
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return false;
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}
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}
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*out_chain = std::move(chain);
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*out_pubkey = std::move(pubkey);
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return true;
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}
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bool ssl_add_cert_chain(SSL_HANDSHAKE *hs, CBB *cbb) {
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if (!ssl_has_certificate(hs)) {
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return CBB_add_u24(cbb, 0);
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}
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CBB certs;
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if (!CBB_add_u24_length_prefixed(cbb, &certs)) {
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OPENSSL_PUT_ERROR(SSL, ERR_R_INTERNAL_ERROR);
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return false;
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}
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STACK_OF(CRYPTO_BUFFER) *chain = hs->config->cert->chain.get();
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for (size_t i = 0; i < sk_CRYPTO_BUFFER_num(chain); i++) {
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CRYPTO_BUFFER *buffer = sk_CRYPTO_BUFFER_value(chain, i);
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CBB child;
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if (!CBB_add_u24_length_prefixed(&certs, &child) ||
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!CBB_add_bytes(&child, CRYPTO_BUFFER_data(buffer),
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CRYPTO_BUFFER_len(buffer)) ||
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!CBB_flush(&certs)) {
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OPENSSL_PUT_ERROR(SSL, ERR_R_INTERNAL_ERROR);
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return false;
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}
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}
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return CBB_flush(cbb);
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}
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// ssl_cert_skip_to_spki parses a DER-encoded, X.509 certificate from |in| and
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// positions |*out_tbs_cert| to cover the TBSCertificate, starting at the
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// subjectPublicKeyInfo.
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static bool ssl_cert_skip_to_spki(const CBS *in, CBS *out_tbs_cert) {
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/* From RFC 5280, section 4.1
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* Certificate ::= SEQUENCE {
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* tbsCertificate TBSCertificate,
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* signatureAlgorithm AlgorithmIdentifier,
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* signatureValue BIT STRING }
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* TBSCertificate ::= SEQUENCE {
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* version [0] EXPLICIT Version DEFAULT v1,
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* serialNumber CertificateSerialNumber,
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* signature AlgorithmIdentifier,
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* issuer Name,
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* validity Validity,
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* subject Name,
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* subjectPublicKeyInfo SubjectPublicKeyInfo,
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* ... } */
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CBS buf = *in;
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CBS toplevel;
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if (!CBS_get_asn1(&buf, &toplevel, CBS_ASN1_SEQUENCE) ||
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CBS_len(&buf) != 0 ||
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!CBS_get_asn1(&toplevel, out_tbs_cert, CBS_ASN1_SEQUENCE) ||
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// version
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!CBS_get_optional_asn1(
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out_tbs_cert, NULL, NULL,
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CBS_ASN1_CONSTRUCTED | CBS_ASN1_CONTEXT_SPECIFIC | 0) ||
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// serialNumber
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!CBS_get_asn1(out_tbs_cert, NULL, CBS_ASN1_INTEGER) ||
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// signature algorithm
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!CBS_get_asn1(out_tbs_cert, NULL, CBS_ASN1_SEQUENCE) ||
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// 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 false;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
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));
|
|
}
|
|
|
|
bool 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 true;
|
|
}
|
|
|
|
switch (EVP_PKEY_cmp(pubkey, privkey)) {
|
|
case 1:
|
|
return true;
|
|
case 0:
|
|
OPENSSL_PUT_ERROR(X509, X509_R_KEY_VALUES_MISMATCH);
|
|
return false;
|
|
case -1:
|
|
OPENSSL_PUT_ERROR(X509, X509_R_KEY_TYPE_MISMATCH);
|
|
return false;
|
|
case -2:
|
|
OPENSSL_PUT_ERROR(X509, X509_R_UNKNOWN_KEY_TYPE);
|
|
return false;
|
|
}
|
|
|
|
assert(0);
|
|
return false;
|
|
}
|
|
|
|
bool 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 false;
|
|
}
|
|
|
|
if (cert->chain == nullptr ||
|
|
sk_CRYPTO_BUFFER_value(cert->chain.get(), 0) == nullptr) {
|
|
OPENSSL_PUT_ERROR(SSL, SSL_R_NO_CERTIFICATE_ASSIGNED);
|
|
return false;
|
|
}
|
|
|
|
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 false;
|
|
}
|
|
|
|
return ssl_compare_public_and_private_key(pubkey.get(), privkey);
|
|
}
|
|
|
|
bool ssl_cert_check_key_usage(const CBS *in, enum ssl_key_usage_t bit) {
|
|
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 false;
|
|
}
|
|
|
|
if (!has_extensions) {
|
|
return true;
|
|
}
|
|
|
|
CBS extensions;
|
|
if (!CBS_get_asn1(&outer_extensions, &extensions, CBS_ASN1_SEQUENCE)) {
|
|
OPENSSL_PUT_ERROR(SSL, SSL_R_CANNOT_PARSE_LEAF_CERT);
|
|
return false;
|
|
}
|
|
|
|
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 false;
|
|
}
|
|
|
|
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 false;
|
|
}
|
|
|
|
// 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 false;
|
|
}
|
|
|
|
if (!CBS_asn1_bitstring_has_bit(&bit_string, bit)) {
|
|
OPENSSL_PUT_ERROR(SSL, SSL_R_KEY_USAGE_BIT_INCORRECT);
|
|
return false;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
// No KeyUsage extension found.
|
|
return true;
|
|
}
|
|
|
|
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_DECODE_ERROR;
|
|
OPENSSL_PUT_ERROR(SSL, SSL_R_DECODE_ERROR);
|
|
return nullptr;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
bool ssl_has_client_CAs(const SSL_CONFIG *cfg) {
|
|
const STACK_OF(CRYPTO_BUFFER) *names = cfg->client_CA.get();
|
|
if (names == nullptr) {
|
|
names = cfg->ssl->ctx->client_CA.get();
|
|
}
|
|
if (names == nullptr) {
|
|
return false;
|
|
}
|
|
return sk_CRYPTO_BUFFER_num(names) > 0;
|
|
}
|
|
|
|
bool ssl_add_client_CA_list(SSL_HANDSHAKE *hs, CBB *cbb) {
|
|
CBB child, name_cbb;
|
|
if (!CBB_add_u16_length_prefixed(cbb, &child)) {
|
|
return false;
|
|
}
|
|
|
|
const STACK_OF(CRYPTO_BUFFER) *names = hs->config->client_CA.get();
|
|
if (names == NULL) {
|
|
names = hs->ssl->ctx->client_CA.get();
|
|
}
|
|
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 false;
|
|
}
|
|
}
|
|
|
|
return CBB_flush(cbb);
|
|
}
|
|
|
|
bool ssl_check_leaf_certificate(SSL_HANDSHAKE *hs, EVP_PKEY *pkey,
|
|
const CRYPTO_BUFFER *leaf) {
|
|
assert(ssl_protocol_version(hs->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 false;
|
|
}
|
|
|
|
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(hs, group_id) ||
|
|
EC_KEY_get_conv_form(ec_key) != POINT_CONVERSION_UNCOMPRESSED) {
|
|
OPENSSL_PUT_ERROR(SSL, SSL_R_BAD_ECC_CERT);
|
|
return false;
|
|
}
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
bool ssl_on_certificate_selected(SSL_HANDSHAKE *hs) {
|
|
SSL *const ssl = hs->ssl;
|
|
if (!ssl_has_certificate(hs)) {
|
|
// Nothing to do.
|
|
return true;
|
|
}
|
|
|
|
if (!ssl->ctx->x509_method->ssl_auto_chain_if_needed(hs)) {
|
|
return false;
|
|
}
|
|
|
|
CBS leaf;
|
|
CRYPTO_BUFFER_init_CBS(
|
|
sk_CRYPTO_BUFFER_value(hs->config->cert->chain.get(), 0), &leaf);
|
|
|
|
if (ssl_signing_with_dc(hs)) {
|
|
hs->local_pubkey = UpRef(hs->config->cert->dc->pkey);
|
|
} else {
|
|
hs->local_pubkey = ssl_cert_parse_pubkey(&leaf);
|
|
}
|
|
return hs->local_pubkey != NULL;
|
|
}
|
|
|
|
|
|
// Delegated credentials.
|
|
|
|
DC::DC() = default;
|
|
DC::~DC() = default;
|
|
|
|
UniquePtr<DC> DC::Dup() {
|
|
bssl::UniquePtr<DC> ret = MakeUnique<DC>();
|
|
if (!ret) {
|
|
return nullptr;
|
|
}
|
|
|
|
ret->raw = UpRef(raw);
|
|
ret->expected_cert_verify_algorithm = expected_cert_verify_algorithm;
|
|
ret->pkey = UpRef(pkey);
|
|
return ret;
|
|
}
|
|
|
|
// static
|
|
UniquePtr<DC> DC::Parse(CRYPTO_BUFFER *in, uint8_t *out_alert) {
|
|
UniquePtr<DC> dc = MakeUnique<DC>();
|
|
if (!dc) {
|
|
*out_alert = SSL_AD_INTERNAL_ERROR;
|
|
return nullptr;
|
|
}
|
|
|
|
dc->raw = UpRef(in);
|
|
|
|
CBS pubkey, deleg, sig;
|
|
uint32_t valid_time;
|
|
uint16_t algorithm;
|
|
CRYPTO_BUFFER_init_CBS(dc->raw.get(), &deleg);
|
|
if (!CBS_get_u32(&deleg, &valid_time) ||
|
|
!CBS_get_u16(&deleg, &dc->expected_cert_verify_algorithm) ||
|
|
!CBS_get_u24_length_prefixed(&deleg, &pubkey) ||
|
|
!CBS_get_u16(&deleg, &algorithm) ||
|
|
!CBS_get_u16_length_prefixed(&deleg, &sig) ||
|
|
CBS_len(&deleg) != 0) {
|
|
OPENSSL_PUT_ERROR(SSL, SSL_R_DECODE_ERROR);
|
|
*out_alert = SSL_AD_DECODE_ERROR;
|
|
return nullptr;
|
|
}
|
|
|
|
dc->pkey.reset(EVP_parse_public_key(&pubkey));
|
|
if (dc->pkey == nullptr) {
|
|
OPENSSL_PUT_ERROR(SSL, SSL_R_DECODE_ERROR);
|
|
*out_alert = SSL_AD_DECODE_ERROR;
|
|
return nullptr;
|
|
}
|
|
|
|
return dc;
|
|
}
|
|
|
|
// ssl_can_serve_dc returns true if the host has configured a DC that it can
|
|
// serve in the handshake. Specifically, it checks that a DC has been
|
|
// configured and that the DC signature algorithm is supported by the peer.
|
|
static bool ssl_can_serve_dc(const SSL_HANDSHAKE *hs) {
|
|
// Check that a DC has been configured.
|
|
const CERT *cert = hs->config->cert.get();
|
|
if (cert->dc == nullptr ||
|
|
cert->dc->raw == nullptr ||
|
|
(cert->dc_privatekey == nullptr && cert->dc_key_method == nullptr)) {
|
|
return false;
|
|
}
|
|
|
|
// Check that 1.3 or higher has been negotiated.
|
|
const DC *dc = cert->dc.get();
|
|
assert(hs->ssl->s3->have_version);
|
|
if (ssl_protocol_version(hs->ssl) < TLS1_3_VERSION) {
|
|
return false;
|
|
}
|
|
|
|
// Check that the DC signature algorithm is supported by the peer.
|
|
Span<const uint16_t> peer_sigalgs = tls1_get_peer_verify_algorithms(hs);
|
|
bool sigalg_found = false;
|
|
for (uint16_t peer_sigalg : peer_sigalgs) {
|
|
if (dc->expected_cert_verify_algorithm == peer_sigalg) {
|
|
sigalg_found = true;
|
|
break;
|
|
}
|
|
}
|
|
|
|
return sigalg_found;
|
|
}
|
|
|
|
bool ssl_signing_with_dc(const SSL_HANDSHAKE *hs) {
|
|
// As of draft-ietf-tls-subcert-03, only the server may use delegated
|
|
// credentials to authenticate itself.
|
|
return hs->ssl->server &&
|
|
hs->delegated_credential_requested &&
|
|
ssl_can_serve_dc(hs);
|
|
}
|
|
|
|
static int cert_set_dc(CERT *cert, CRYPTO_BUFFER *const raw, EVP_PKEY *privkey,
|
|
const SSL_PRIVATE_KEY_METHOD *key_method) {
|
|
if (privkey == nullptr && key_method == nullptr) {
|
|
OPENSSL_PUT_ERROR(SSL, ERR_R_PASSED_NULL_PARAMETER);
|
|
return 0;
|
|
}
|
|
|
|
if (privkey != nullptr && key_method != nullptr) {
|
|
OPENSSL_PUT_ERROR(SSL, SSL_R_CANNOT_HAVE_BOTH_PRIVKEY_AND_METHOD);
|
|
return 0;
|
|
}
|
|
|
|
uint8_t alert;
|
|
UniquePtr<DC> dc = DC::Parse(raw, &alert);
|
|
if (dc == nullptr) {
|
|
OPENSSL_PUT_ERROR(SSL, SSL_R_INVALID_DELEGATED_CREDENTIAL);
|
|
return 0;
|
|
}
|
|
|
|
if (privkey) {
|
|
// Check that the public and private keys match.
|
|
if (!ssl_compare_public_and_private_key(dc->pkey.get(), privkey)) {
|
|
OPENSSL_PUT_ERROR(SSL, SSL_R_CERTIFICATE_AND_PRIVATE_KEY_MISMATCH);
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
cert->dc = std::move(dc);
|
|
cert->dc_privatekey = UpRef(privkey);
|
|
cert->dc_key_method = key_method;
|
|
|
|
return 1;
|
|
}
|
|
|
|
BSSL_NAMESPACE_END
|
|
|
|
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) {
|
|
if (!ssl->config) {
|
|
return 0;
|
|
}
|
|
return cert_set_chain_and_key(ssl->config->cert.get(), 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.get(), 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.get(), 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 || !ssl->config) {
|
|
return 0;
|
|
}
|
|
|
|
return ssl_set_cert(ssl->config->cert.get(), 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.get(), cb, arg);
|
|
}
|
|
|
|
void SSL_set_cert_cb(SSL *ssl, int (*cb)(SSL *ssl, void *arg), void *arg) {
|
|
if (!ssl->config) {
|
|
return;
|
|
}
|
|
ssl_cert_set_cert_cb(ssl->config->cert.get(), cb, arg);
|
|
}
|
|
|
|
const 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.get();
|
|
}
|
|
|
|
const 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.get(), list, list_len);
|
|
}
|
|
|
|
int SSL_set_signed_cert_timestamp_list(SSL *ssl, const uint8_t *list,
|
|
size_t list_len) {
|
|
if (!ssl->config) {
|
|
return 0;
|
|
}
|
|
return set_signed_cert_timestamp_list(ssl->config->cert.get(), 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) {
|
|
if (!ssl->config) {
|
|
return 0;
|
|
}
|
|
ssl->config->cert->ocsp_response.reset(
|
|
CRYPTO_BUFFER_new(response, response_len, nullptr));
|
|
return ssl->config->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);
|
|
ctx->client_CA.reset(name_list);
|
|
}
|
|
|
|
void SSL_set0_client_CAs(SSL *ssl, STACK_OF(CRYPTO_BUFFER) *name_list) {
|
|
if (!ssl->config) {
|
|
return;
|
|
}
|
|
ssl->ctx->x509_method->ssl_flush_cached_client_CA(ssl->config.get());
|
|
ssl->config->client_CA.reset(name_list);
|
|
}
|
|
|
|
int SSL_set1_delegated_credential(SSL *ssl, CRYPTO_BUFFER *dc, EVP_PKEY *pkey,
|
|
const SSL_PRIVATE_KEY_METHOD *key_method) {
|
|
if (!ssl->config) {
|
|
return 0;
|
|
}
|
|
|
|
return cert_set_dc(ssl->config->cert.get(), dc, pkey, key_method);
|
|
}
|
|
|
|
int SSL_delegated_credential_used(const SSL *ssl) {
|
|
return ssl->s3->delegated_credential_used;
|
|
}
|