275 lines
10 KiB
C++
275 lines
10 KiB
C++
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/* DTLS implementation written by Nagendra Modadugu
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* (nagendra@cs.stanford.edu) for the OpenSSL project 2005. */
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/* ====================================================================
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* Copyright (c) 1998-2005 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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/* 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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#include <openssl/ssl.h>
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#include <assert.h>
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#include <string.h>
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#include <openssl/bio.h>
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#include <openssl/buf.h>
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#include <openssl/bytestring.h>
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#include <openssl/mem.h>
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#include <openssl/evp.h>
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#include <openssl/err.h>
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#include <openssl/rand.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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ssl_open_record_t dtls1_open_app_data(SSL *ssl, Span<uint8_t> *out,
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size_t *out_consumed, uint8_t *out_alert,
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Span<uint8_t> in) {
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assert(!SSL_in_init(ssl));
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uint8_t type;
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Span<uint8_t> record;
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auto ret = dtls_open_record(ssl, &type, &record, out_consumed, out_alert, in);
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if (ret != ssl_open_record_success) {
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return ret;
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}
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if (type == SSL3_RT_HANDSHAKE) {
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// Parse the first fragment header to determine if this is a pre-CCS or
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// post-CCS handshake record. DTLS resets handshake message numbers on each
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// handshake, so renegotiations and retransmissions are ambiguous.
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CBS cbs, body;
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struct hm_header_st msg_hdr;
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CBS_init(&cbs, record.data(), record.size());
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if (!dtls1_parse_fragment(&cbs, &msg_hdr, &body)) {
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OPENSSL_PUT_ERROR(SSL, SSL_R_BAD_HANDSHAKE_RECORD);
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*out_alert = SSL_AD_DECODE_ERROR;
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return ssl_open_record_error;
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}
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if (msg_hdr.type == SSL3_MT_FINISHED &&
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msg_hdr.seq == ssl->d1->handshake_read_seq - 1) {
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if (msg_hdr.frag_off == 0) {
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// Retransmit our last flight of messages. If the peer sends the second
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// Finished, they may not have received ours. Only do this for the
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// first fragment, in case the Finished was fragmented.
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if (!dtls1_check_timeout_num(ssl)) {
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*out_alert = 0; // TODO(davidben): Send an alert?
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return ssl_open_record_error;
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}
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dtls1_retransmit_outgoing_messages(ssl);
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}
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return ssl_open_record_discard;
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}
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// Otherwise, this is a pre-CCS handshake message from an unsupported
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// renegotiation attempt. Fall through to the error path.
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}
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if (type != SSL3_RT_APPLICATION_DATA) {
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OPENSSL_PUT_ERROR(SSL, SSL_R_UNEXPECTED_RECORD);
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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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if (record.empty()) {
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return ssl_open_record_discard;
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}
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*out = record;
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return ssl_open_record_success;
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}
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int dtls1_write_app_data(SSL *ssl, bool *out_needs_handshake, const uint8_t *in,
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int len) {
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assert(!SSL_in_init(ssl));
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*out_needs_handshake = false;
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if (ssl->s3->write_shutdown != ssl_shutdown_none) {
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OPENSSL_PUT_ERROR(SSL, SSL_R_PROTOCOL_IS_SHUTDOWN);
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return -1;
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}
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if (len > SSL3_RT_MAX_PLAIN_LENGTH) {
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OPENSSL_PUT_ERROR(SSL, SSL_R_DTLS_MESSAGE_TOO_BIG);
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return -1;
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}
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if (len < 0) {
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OPENSSL_PUT_ERROR(SSL, SSL_R_BAD_LENGTH);
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return -1;
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}
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if (len == 0) {
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return 0;
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}
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int ret = dtls1_write_record(ssl, SSL3_RT_APPLICATION_DATA, in, (size_t)len,
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dtls1_use_current_epoch);
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if (ret <= 0) {
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return ret;
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}
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return len;
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}
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int dtls1_write_record(SSL *ssl, int type, const uint8_t *in, size_t len,
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enum dtls1_use_epoch_t use_epoch) {
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SSLBuffer *buf = &ssl->s3->write_buffer;
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assert(len <= SSL3_RT_MAX_PLAIN_LENGTH);
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// There should never be a pending write buffer in DTLS. One can't write half
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// a datagram, so the write buffer is always dropped in
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// |ssl_write_buffer_flush|.
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assert(buf->empty());
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if (len > SSL3_RT_MAX_PLAIN_LENGTH) {
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OPENSSL_PUT_ERROR(SSL, ERR_R_INTERNAL_ERROR);
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return -1;
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}
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size_t ciphertext_len;
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if (!buf->EnsureCap(ssl_seal_align_prefix_len(ssl),
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len + SSL_max_seal_overhead(ssl)) ||
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!dtls_seal_record(ssl, buf->remaining().data(), &ciphertext_len,
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buf->remaining().size(), type, in, len, use_epoch)) {
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buf->Clear();
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return -1;
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}
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buf->DidWrite(ciphertext_len);
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int ret = ssl_write_buffer_flush(ssl);
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if (ret <= 0) {
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return ret;
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}
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return 1;
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}
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int dtls1_dispatch_alert(SSL *ssl) {
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int ret = dtls1_write_record(ssl, SSL3_RT_ALERT, &ssl->s3->send_alert[0], 2,
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dtls1_use_current_epoch);
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if (ret <= 0) {
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return ret;
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}
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ssl->s3->alert_dispatch = false;
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// If the alert is fatal, flush the BIO now.
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if (ssl->s3->send_alert[0] == SSL3_AL_FATAL) {
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BIO_flush(ssl->wbio.get());
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}
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ssl_do_msg_callback(ssl, 1 /* write */, SSL3_RT_ALERT, ssl->s3->send_alert);
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int alert = (ssl->s3->send_alert[0] << 8) | ssl->s3->send_alert[1];
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ssl_do_info_callback(ssl, SSL_CB_WRITE_ALERT, alert);
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return 1;
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}
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BSSL_NAMESPACE_END
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