2015-07-29 02:34:45 +01:00
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/* 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) 1998-2002 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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#include <openssl/ssl.h>
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#include <assert.h>
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2015-12-25 20:34:23 +00:00
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#include <string.h>
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2015-07-29 02:34:45 +01:00
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#include <openssl/bytestring.h>
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#include <openssl/err.h>
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2016-06-02 20:42:01 +01:00
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#include <openssl/mem.h>
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2015-07-29 02:34:45 +01:00
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#include "internal.h"
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2016-06-08 23:31:24 +01:00
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#include "../crypto/internal.h"
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2015-07-29 02:34:45 +01:00
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2015-08-22 06:35:43 +01:00
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/* kMaxEmptyRecords is the number of consecutive, empty records that will be
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* processed. Without this limit an attacker could send empty records at a
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* faster rate than we can process and cause record processing to loop
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* forever. */
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static const uint8_t kMaxEmptyRecords = 32;
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2016-06-02 20:42:01 +01:00
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/* kMaxWarningAlerts is the number of consecutive warning alerts that will be
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* processed. */
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static const uint8_t kMaxWarningAlerts = 4;
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2015-12-06 21:07:47 +00:00
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/* ssl_needs_record_splitting returns one if |ssl|'s current outgoing cipher
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* state needs record-splitting and zero otherwise. */
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static int ssl_needs_record_splitting(const SSL *ssl) {
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2015-12-30 05:08:49 +00:00
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return ssl->s3->aead_write_ctx != NULL &&
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ssl3_protocol_version(ssl) < TLS1_1_VERSION &&
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2015-12-06 21:07:47 +00:00
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(ssl->mode & SSL_MODE_CBC_RECORD_SPLITTING) != 0 &&
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2015-12-25 20:56:49 +00:00
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SSL_CIPHER_is_block_cipher(ssl->s3->aead_write_ctx->cipher);
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2015-12-06 21:07:47 +00:00
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}
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2015-12-25 20:11:39 +00:00
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int ssl_record_sequence_update(uint8_t *seq, size_t seq_len) {
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size_t i;
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for (i = seq_len - 1; i < seq_len; i--) {
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++seq[i];
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if (seq[i] != 0) {
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return 1;
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}
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}
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OPENSSL_PUT_ERROR(SSL, ERR_R_OVERFLOW);
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return 0;
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}
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2015-07-29 02:34:45 +01:00
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size_t ssl_record_prefix_len(const SSL *ssl) {
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if (SSL_IS_DTLS(ssl)) {
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return DTLS1_RT_HEADER_LENGTH +
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2015-12-25 20:56:49 +00:00
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SSL_AEAD_CTX_explicit_nonce_len(ssl->s3->aead_read_ctx);
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2015-07-29 02:34:45 +01:00
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} else {
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return SSL3_RT_HEADER_LENGTH +
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2015-12-25 20:56:49 +00:00
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SSL_AEAD_CTX_explicit_nonce_len(ssl->s3->aead_read_ctx);
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2015-07-29 02:34:45 +01:00
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}
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}
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2016-06-08 23:31:24 +01:00
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size_t ssl_seal_align_prefix_len(const SSL *ssl) {
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2015-07-29 02:34:45 +01:00
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if (SSL_IS_DTLS(ssl)) {
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return DTLS1_RT_HEADER_LENGTH +
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2015-12-25 20:56:49 +00:00
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SSL_AEAD_CTX_explicit_nonce_len(ssl->s3->aead_write_ctx);
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2015-07-29 02:34:45 +01:00
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} else {
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size_t ret = SSL3_RT_HEADER_LENGTH +
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2015-12-25 20:56:49 +00:00
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SSL_AEAD_CTX_explicit_nonce_len(ssl->s3->aead_write_ctx);
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2015-12-06 21:07:47 +00:00
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if (ssl_needs_record_splitting(ssl)) {
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2015-07-29 02:34:45 +01:00
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ret += SSL3_RT_HEADER_LENGTH;
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2015-12-25 20:56:49 +00:00
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ret += ssl_cipher_get_record_split_len(ssl->s3->aead_write_ctx->cipher);
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2015-07-29 02:34:45 +01:00
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}
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return ret;
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}
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}
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size_t ssl_max_seal_overhead(const SSL *ssl) {
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2016-06-01 19:07:09 +01:00
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size_t ret = SSL_AEAD_CTX_max_overhead(ssl->s3->aead_write_ctx);
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2015-07-29 02:34:45 +01:00
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if (SSL_IS_DTLS(ssl)) {
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2016-06-01 19:07:09 +01:00
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ret += DTLS1_RT_HEADER_LENGTH;
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2015-07-29 02:34:45 +01:00
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} else {
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2016-06-01 19:07:09 +01:00
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ret += SSL3_RT_HEADER_LENGTH;
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2015-07-29 02:34:45 +01:00
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}
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2016-06-01 19:07:09 +01:00
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/* TLS 1.3 needs an extra byte for the encrypted record type. */
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if (ssl->s3->have_version &&
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ssl3_protocol_version(ssl) >= TLS1_3_VERSION) {
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ret += 1;
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}
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if (!SSL_IS_DTLS(ssl) && ssl_needs_record_splitting(ssl)) {
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ret *= 2;
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}
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return ret;
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2015-07-29 02:34:45 +01:00
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}
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2016-06-06 23:54:51 +01:00
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enum ssl_open_record_t tls_open_record(SSL *ssl, uint8_t *out_type, CBS *out,
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size_t *out_consumed, uint8_t *out_alert,
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uint8_t *in, size_t in_len) {
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2016-06-02 20:42:01 +01:00
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*out_consumed = 0;
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2015-07-29 02:34:45 +01:00
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CBS cbs;
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CBS_init(&cbs, in, in_len);
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/* Decode the record header. */
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uint8_t type;
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uint16_t version, ciphertext_len;
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if (!CBS_get_u8(&cbs, &type) ||
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!CBS_get_u16(&cbs, &version) ||
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!CBS_get_u16(&cbs, &ciphertext_len)) {
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*out_consumed = SSL3_RT_HEADER_LENGTH;
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return ssl_open_record_partial;
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}
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2016-06-01 19:07:09 +01:00
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/* Check that the major version in the record matches. As of TLS 1.3, the
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* minor version is no longer checked. */
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if ((version >> 8) != SSL3_VERSION_MAJOR) {
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2015-07-29 02:34:45 +01:00
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OPENSSL_PUT_ERROR(SSL, SSL_R_WRONG_VERSION_NUMBER);
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*out_alert = SSL_AD_PROTOCOL_VERSION;
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return ssl_open_record_error;
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}
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/* Check the ciphertext length. */
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2015-11-19 01:41:11 +00:00
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if (ciphertext_len > SSL3_RT_MAX_ENCRYPTED_LENGTH) {
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2015-07-29 02:34:45 +01:00
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OPENSSL_PUT_ERROR(SSL, SSL_R_ENCRYPTED_LENGTH_TOO_LONG);
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*out_alert = SSL_AD_RECORD_OVERFLOW;
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return ssl_open_record_error;
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}
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/* Extract the body. */
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CBS body;
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if (!CBS_get_bytes(&cbs, &body, ciphertext_len)) {
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*out_consumed = SSL3_RT_HEADER_LENGTH + (size_t)ciphertext_len;
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return ssl_open_record_partial;
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}
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2016-06-02 01:16:03 +01:00
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ssl_do_msg_callback(ssl, 0 /* read */, 0, SSL3_RT_HEADER, in,
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SSL3_RT_HEADER_LENGTH);
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2015-07-29 02:34:45 +01:00
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2016-06-06 23:54:51 +01:00
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/* Decrypt the body in-place. */
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if (!SSL_AEAD_CTX_open(ssl->s3->aead_read_ctx, out, type, version,
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ssl->s3->read_sequence, (uint8_t *)CBS_data(&body),
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2015-07-29 02:34:45 +01:00
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CBS_len(&body))) {
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OPENSSL_PUT_ERROR(SSL, SSL_R_DECRYPTION_FAILED_OR_BAD_RECORD_MAC);
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*out_alert = SSL_AD_BAD_RECORD_MAC;
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return ssl_open_record_error;
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}
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2016-06-02 20:42:01 +01:00
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*out_consumed = in_len - CBS_len(&cbs);
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2015-12-25 20:11:39 +00:00
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if (!ssl_record_sequence_update(ssl->s3->read_sequence, 8)) {
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2015-07-29 02:34:45 +01:00
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*out_alert = SSL_AD_INTERNAL_ERROR;
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return ssl_open_record_error;
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}
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2016-06-01 19:07:09 +01:00
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/* TLS 1.3 hides the record type inside the encrypted data. */
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if (ssl->s3->have_version &&
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ssl3_protocol_version(ssl) >= TLS1_3_VERSION &&
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ssl->s3->aead_read_ctx != NULL) {
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2016-06-06 23:54:51 +01:00
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do {
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if (!CBS_get_last_u8(out, &type)) {
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OPENSSL_PUT_ERROR(SSL, SSL_R_DECRYPTION_FAILED_OR_BAD_RECORD_MAC);
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*out_alert = SSL_AD_DECRYPT_ERROR;
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return ssl_open_record_error;
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}
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} while (type == 0);
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2016-06-01 19:07:09 +01:00
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}
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2015-07-29 02:34:45 +01:00
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/* Check the plaintext length. */
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2016-06-06 23:54:51 +01:00
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if (CBS_len(out) > SSL3_RT_MAX_PLAIN_LENGTH) {
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2015-07-29 02:34:45 +01:00
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OPENSSL_PUT_ERROR(SSL, SSL_R_DATA_LENGTH_TOO_LONG);
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*out_alert = SSL_AD_RECORD_OVERFLOW;
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return ssl_open_record_error;
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}
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2015-08-22 06:35:43 +01:00
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/* Limit the number of consecutive empty records. */
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2016-06-06 23:54:51 +01:00
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if (CBS_len(out) == 0) {
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2015-08-22 06:35:43 +01:00
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ssl->s3->empty_record_count++;
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if (ssl->s3->empty_record_count > kMaxEmptyRecords) {
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OPENSSL_PUT_ERROR(SSL, SSL_R_TOO_MANY_EMPTY_FRAGMENTS);
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*out_alert = SSL_AD_UNEXPECTED_MESSAGE;
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return ssl_open_record_error;
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}
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/* Apart from the limit, empty records are returned up to the caller. This
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* allows the caller to reject records of the wrong type. */
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} else {
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ssl->s3->empty_record_count = 0;
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}
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2016-06-02 20:42:01 +01:00
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if (type == SSL3_RT_ALERT) {
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2016-06-06 23:54:51 +01:00
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return ssl_process_alert(ssl, out_alert, CBS_data(out), CBS_len(out));
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2016-06-02 20:42:01 +01:00
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}
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ssl->s3->warning_alert_count = 0;
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2015-07-29 02:34:45 +01:00
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*out_type = type;
|
|
|
|
return ssl_open_record_success;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int do_seal_record(SSL *ssl, uint8_t *out, size_t *out_len,
|
|
|
|
size_t max_out, uint8_t type, const uint8_t *in,
|
|
|
|
size_t in_len) {
|
|
|
|
if (max_out < SSL3_RT_HEADER_LENGTH) {
|
|
|
|
OPENSSL_PUT_ERROR(SSL, SSL_R_BUFFER_TOO_SMALL);
|
|
|
|
return 0;
|
|
|
|
}
|
2016-06-08 23:31:24 +01:00
|
|
|
|
|
|
|
/* Either |in| and |out| don't alias or |in| aligns with the
|
|
|
|
* ciphertext. |tls_seal_record| forbids aliasing, but TLS 1.3 aliases them
|
|
|
|
* internally. */
|
|
|
|
assert(!buffers_alias(in, in_len, out, max_out) ||
|
|
|
|
in ==
|
|
|
|
out + SSL3_RT_HEADER_LENGTH +
|
|
|
|
SSL_AEAD_CTX_explicit_nonce_len(ssl->s3->aead_write_ctx));
|
2015-07-29 02:34:45 +01:00
|
|
|
|
|
|
|
out[0] = type;
|
|
|
|
|
2016-06-01 19:07:09 +01:00
|
|
|
/* The TLS record-layer version number is meaningless and, starting in
|
|
|
|
* TLS 1.3, is frozen at TLS 1.0. But for historical reasons, SSL 3.0
|
|
|
|
* ClientHellos should use SSL 3.0 and pre-TLS-1.3 expects the version
|
|
|
|
* to change after version negotiation. */
|
|
|
|
uint16_t wire_version = TLS1_VERSION;
|
|
|
|
if (ssl->version == SSL3_VERSION ||
|
|
|
|
(ssl->s3->have_version && ssl3_protocol_version(ssl) < TLS1_3_VERSION)) {
|
|
|
|
wire_version = ssl->version;
|
2015-07-29 02:34:45 +01:00
|
|
|
}
|
|
|
|
out[1] = wire_version >> 8;
|
|
|
|
out[2] = wire_version & 0xff;
|
|
|
|
|
|
|
|
size_t ciphertext_len;
|
2015-12-25 20:56:49 +00:00
|
|
|
if (!SSL_AEAD_CTX_seal(ssl->s3->aead_write_ctx, out + SSL3_RT_HEADER_LENGTH,
|
2015-07-29 02:34:45 +01:00
|
|
|
&ciphertext_len, max_out - SSL3_RT_HEADER_LENGTH,
|
|
|
|
type, wire_version, ssl->s3->write_sequence, in,
|
|
|
|
in_len) ||
|
2015-12-25 20:11:39 +00:00
|
|
|
!ssl_record_sequence_update(ssl->s3->write_sequence, 8)) {
|
2015-07-29 02:34:45 +01:00
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (ciphertext_len >= 1 << 16) {
|
|
|
|
OPENSSL_PUT_ERROR(SSL, ERR_R_OVERFLOW);
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
out[3] = ciphertext_len >> 8;
|
|
|
|
out[4] = ciphertext_len & 0xff;
|
|
|
|
|
|
|
|
*out_len = SSL3_RT_HEADER_LENGTH + ciphertext_len;
|
|
|
|
|
2016-06-02 01:16:03 +01:00
|
|
|
ssl_do_msg_callback(ssl, 1 /* write */, 0, SSL3_RT_HEADER, out,
|
|
|
|
SSL3_RT_HEADER_LENGTH);
|
2015-07-29 02:34:45 +01:00
|
|
|
return 1;
|
|
|
|
}
|
|
|
|
|
|
|
|
int tls_seal_record(SSL *ssl, uint8_t *out, size_t *out_len, size_t max_out,
|
|
|
|
uint8_t type, const uint8_t *in, size_t in_len) {
|
2016-06-08 23:31:24 +01:00
|
|
|
if (buffers_alias(in, in_len, out, max_out)) {
|
|
|
|
OPENSSL_PUT_ERROR(SSL, SSL_R_OUTPUT_ALIASES_INPUT);
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2015-07-29 02:34:45 +01:00
|
|
|
size_t frag_len = 0;
|
2016-06-01 19:07:09 +01:00
|
|
|
|
|
|
|
/* TLS 1.3 hides the actual record type inside the encrypted data. */
|
|
|
|
if (ssl->s3->have_version &&
|
|
|
|
ssl3_protocol_version(ssl) >= TLS1_3_VERSION &&
|
|
|
|
ssl->s3->aead_read_ctx != NULL) {
|
|
|
|
size_t padding = SSL3_RT_HEADER_LENGTH + 1;
|
|
|
|
|
|
|
|
if (in_len > in_len + padding || max_out < in_len + padding) {
|
|
|
|
OPENSSL_PUT_ERROR(SSL, SSL_R_BUFFER_TOO_SMALL);
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
memmove(out + SSL3_RT_HEADER_LENGTH, in, in_len);
|
|
|
|
out[SSL3_RT_HEADER_LENGTH + in_len] = type;
|
|
|
|
in = out + SSL3_RT_HEADER_LENGTH;
|
|
|
|
type = SSL3_RT_APPLICATION_DATA;
|
|
|
|
in_len++;
|
|
|
|
}
|
|
|
|
|
2015-12-06 21:07:47 +00:00
|
|
|
if (type == SSL3_RT_APPLICATION_DATA && in_len > 1 &&
|
|
|
|
ssl_needs_record_splitting(ssl)) {
|
2016-06-08 23:31:24 +01:00
|
|
|
if (!do_seal_record(ssl, out, &frag_len, max_out, type, in, 1)) {
|
2015-07-29 02:34:45 +01:00
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
in++;
|
|
|
|
in_len--;
|
|
|
|
out += frag_len;
|
|
|
|
max_out -= frag_len;
|
|
|
|
|
2016-03-02 03:57:40 +00:00
|
|
|
#if !defined(BORINGSSL_UNSAFE_FUZZER_MODE)
|
2015-12-25 20:56:49 +00:00
|
|
|
assert(SSL3_RT_HEADER_LENGTH + ssl_cipher_get_record_split_len(
|
|
|
|
ssl->s3->aead_write_ctx->cipher) ==
|
2015-07-29 02:34:45 +01:00
|
|
|
frag_len);
|
2016-03-02 03:57:40 +00:00
|
|
|
#endif
|
2015-07-29 02:34:45 +01:00
|
|
|
}
|
|
|
|
|
|
|
|
if (!do_seal_record(ssl, out, out_len, max_out, type, in, in_len)) {
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
*out_len += frag_len;
|
|
|
|
return 1;
|
|
|
|
}
|
2015-12-25 20:34:23 +00:00
|
|
|
|
|
|
|
void ssl_set_read_state(SSL *ssl, SSL_AEAD_CTX *aead_ctx) {
|
|
|
|
if (SSL_IS_DTLS(ssl)) {
|
|
|
|
ssl->d1->r_epoch++;
|
|
|
|
memset(&ssl->d1->bitmap, 0, sizeof(ssl->d1->bitmap));
|
|
|
|
}
|
|
|
|
memset(ssl->s3->read_sequence, 0, sizeof(ssl->s3->read_sequence));
|
|
|
|
|
2015-12-25 20:56:49 +00:00
|
|
|
SSL_AEAD_CTX_free(ssl->s3->aead_read_ctx);
|
|
|
|
ssl->s3->aead_read_ctx = aead_ctx;
|
2015-12-25 20:34:23 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
void ssl_set_write_state(SSL *ssl, SSL_AEAD_CTX *aead_ctx) {
|
|
|
|
if (SSL_IS_DTLS(ssl)) {
|
|
|
|
ssl->d1->w_epoch++;
|
|
|
|
memcpy(ssl->d1->last_write_sequence, ssl->s3->write_sequence,
|
|
|
|
sizeof(ssl->s3->write_sequence));
|
|
|
|
}
|
|
|
|
memset(ssl->s3->write_sequence, 0, sizeof(ssl->s3->write_sequence));
|
|
|
|
|
2015-12-25 20:56:49 +00:00
|
|
|
SSL_AEAD_CTX_free(ssl->s3->aead_write_ctx);
|
|
|
|
ssl->s3->aead_write_ctx = aead_ctx;
|
2015-12-25 20:34:23 +00:00
|
|
|
}
|
2016-06-02 20:42:01 +01:00
|
|
|
|
|
|
|
enum ssl_open_record_t ssl_process_alert(SSL *ssl, uint8_t *out_alert,
|
|
|
|
const uint8_t *in, size_t in_len) {
|
|
|
|
/* Alerts records may not contain fragmented or multiple alerts. */
|
|
|
|
if (in_len != 2) {
|
|
|
|
*out_alert = SSL_AD_DECODE_ERROR;
|
|
|
|
OPENSSL_PUT_ERROR(SSL, SSL_R_BAD_ALERT);
|
|
|
|
return ssl_open_record_error;
|
|
|
|
}
|
|
|
|
|
|
|
|
ssl_do_msg_callback(ssl, 0 /* read */, ssl->version, SSL3_RT_ALERT, in, in_len);
|
|
|
|
|
|
|
|
const uint8_t alert_level = in[0];
|
|
|
|
const uint8_t alert_descr = in[1];
|
|
|
|
|
|
|
|
uint16_t alert = (alert_level << 8) | alert_descr;
|
|
|
|
ssl_do_info_callback(ssl, SSL_CB_READ_ALERT, alert);
|
|
|
|
|
|
|
|
if (alert_level == SSL3_AL_WARNING) {
|
|
|
|
if (alert_descr == SSL_AD_CLOSE_NOTIFY) {
|
|
|
|
ssl->s3->recv_shutdown = ssl_shutdown_close_notify;
|
|
|
|
return ssl_open_record_close_notify;
|
|
|
|
}
|
|
|
|
|
|
|
|
ssl->s3->warning_alert_count++;
|
|
|
|
if (ssl->s3->warning_alert_count > kMaxWarningAlerts) {
|
|
|
|
*out_alert = SSL_AD_UNEXPECTED_MESSAGE;
|
|
|
|
OPENSSL_PUT_ERROR(SSL, SSL_R_TOO_MANY_WARNING_ALERTS);
|
|
|
|
return ssl_open_record_error;
|
|
|
|
}
|
|
|
|
return ssl_open_record_discard;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (alert_level == SSL3_AL_FATAL) {
|
|
|
|
ssl->s3->recv_shutdown = ssl_shutdown_fatal_alert;
|
|
|
|
SSL_CTX_remove_session(ssl->ctx, ssl->session);
|
|
|
|
|
|
|
|
char tmp[16];
|
|
|
|
OPENSSL_PUT_ERROR(SSL, SSL_AD_REASON_OFFSET + alert_descr);
|
|
|
|
BIO_snprintf(tmp, sizeof(tmp), "%d", alert_descr);
|
|
|
|
ERR_add_error_data(2, "SSL alert number ", tmp);
|
|
|
|
return ssl_open_record_fatal_alert;
|
|
|
|
}
|
|
|
|
|
|
|
|
*out_alert = SSL_AD_ILLEGAL_PARAMETER;
|
|
|
|
OPENSSL_PUT_ERROR(SSL, SSL_R_UNKNOWN_ALERT_TYPE);
|
|
|
|
return ssl_open_record_error;
|
|
|
|
}
|