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- /* DTLS implementation written by Nagendra Modadugu
- * (nagendra@cs.stanford.edu) for the OpenSSL project 2005. */
- /* ====================================================================
- * Copyright (c) 1998-2005 The OpenSSL Project. All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- *
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- *
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in
- * the documentation and/or other materials provided with the
- * distribution.
- *
- * 3. All advertising materials mentioning features or use of this
- * software must display the following acknowledgment:
- * "This product includes software developed by the OpenSSL Project
- * for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
- *
- * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
- * endorse or promote products derived from this software without
- * prior written permission. For written permission, please contact
- * openssl-core@openssl.org.
- *
- * 5. Products derived from this software may not be called "OpenSSL"
- * nor may "OpenSSL" appear in their names without prior written
- * permission of the OpenSSL Project.
- *
- * 6. Redistributions of any form whatsoever must retain the following
- * acknowledgment:
- * "This product includes software developed by the OpenSSL Project
- * for use in the OpenSSL Toolkit (http://www.openssl.org/)"
- *
- * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
- * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
- * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
- * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
- * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
- * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
- * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
- * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
- * OF THE POSSIBILITY OF SUCH DAMAGE.
- * ====================================================================
- *
- * This product includes cryptographic software written by Eric Young
- * (eay@cryptsoft.com). This product includes software written by Tim
- * Hudson (tjh@cryptsoft.com).
- *
- */
- /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
- * All rights reserved.
- *
- * This package is an SSL implementation written
- * by Eric Young (eay@cryptsoft.com).
- * The implementation was written so as to conform with Netscapes SSL.
- *
- * This library is free for commercial and non-commercial use as long as
- * the following conditions are aheared to. The following conditions
- * apply to all code found in this distribution, be it the RC4, RSA,
- * lhash, DES, etc., code; not just the SSL code. The SSL documentation
- * included with this distribution is covered by the same copyright terms
- * except that the holder is Tim Hudson (tjh@cryptsoft.com).
- *
- * Copyright remains Eric Young's, and as such any Copyright notices in
- * the code are not to be removed.
- * If this package is used in a product, Eric Young should be given attribution
- * as the author of the parts of the library used.
- * This can be in the form of a textual message at program startup or
- * in documentation (online or textual) provided with the package.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- * 3. All advertising materials mentioning features or use of this software
- * must display the following acknowledgement:
- * "This product includes cryptographic software written by
- * Eric Young (eay@cryptsoft.com)"
- * The word 'cryptographic' can be left out if the rouines from the library
- * being used are not cryptographic related :-).
- * 4. If you include any Windows specific code (or a derivative thereof) from
- * the apps directory (application code) you must include an acknowledgement:
- * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
- *
- * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- *
- * The licence and distribution terms for any publically available version or
- * derivative of this code cannot be changed. i.e. this code cannot simply be
- * copied and put under another distribution licence
- * [including the GNU Public Licence.] */
-
- #include <openssl/ssl.h>
-
- #include <assert.h>
- #include <string.h>
-
- #include <openssl/bio.h>
- #include <openssl/buf.h>
- #include <openssl/bytestring.h>
- #include <openssl/mem.h>
- #include <openssl/evp.h>
- #include <openssl/err.h>
- #include <openssl/rand.h>
-
- #include "../crypto/internal.h"
- #include "internal.h"
-
-
- namespace bssl {
-
- ssl_open_record_t dtls1_open_app_data(SSL *ssl, Span<uint8_t> *out,
- size_t *out_consumed, uint8_t *out_alert,
- Span<uint8_t> in) {
- assert(!SSL_in_init(ssl));
-
- uint8_t type;
- Span<uint8_t> record;
- auto ret = dtls_open_record(ssl, &type, &record, out_consumed, out_alert, in);
- if (ret != ssl_open_record_success) {
- return ret;
- }
-
- if (type == SSL3_RT_HANDSHAKE) {
- // Parse the first fragment header to determine if this is a pre-CCS or
- // post-CCS handshake record. DTLS resets handshake message numbers on each
- // handshake, so renegotiations and retransmissions are ambiguous.
- CBS cbs, body;
- struct hm_header_st msg_hdr;
- CBS_init(&cbs, record.data(), record.size());
- if (!dtls1_parse_fragment(&cbs, &msg_hdr, &body)) {
- OPENSSL_PUT_ERROR(SSL, SSL_R_BAD_HANDSHAKE_RECORD);
- *out_alert = SSL_AD_DECODE_ERROR;
- return ssl_open_record_error;
- }
-
- if (msg_hdr.type == SSL3_MT_FINISHED &&
- msg_hdr.seq == ssl->d1->handshake_read_seq - 1) {
- if (msg_hdr.frag_off == 0) {
- // Retransmit our last flight of messages. If the peer sends the second
- // Finished, they may not have received ours. Only do this for the
- // first fragment, in case the Finished was fragmented.
- if (!dtls1_check_timeout_num(ssl)) {
- *out_alert = 0; // TODO(davidben): Send an alert?
- return ssl_open_record_error;
- }
-
- dtls1_retransmit_outgoing_messages(ssl);
- }
- return ssl_open_record_discard;
- }
-
- // Otherwise, this is a pre-CCS handshake message from an unsupported
- // renegotiation attempt. Fall through to the error path.
- }
-
- if (type != SSL3_RT_APPLICATION_DATA) {
- OPENSSL_PUT_ERROR(SSL, SSL_R_UNEXPECTED_RECORD);
- *out_alert = SSL_AD_UNEXPECTED_MESSAGE;
- return ssl_open_record_error;
- }
-
- if (record.empty()) {
- return ssl_open_record_discard;
- }
-
- *out = record;
- return ssl_open_record_success;
- }
-
- int dtls1_write_app_data(SSL *ssl, bool *out_needs_handshake, const uint8_t *in,
- int len) {
- assert(!SSL_in_init(ssl));
- *out_needs_handshake = false;
-
- if (ssl->s3->write_shutdown != ssl_shutdown_none) {
- OPENSSL_PUT_ERROR(SSL, SSL_R_PROTOCOL_IS_SHUTDOWN);
- return -1;
- }
-
- if (len > SSL3_RT_MAX_PLAIN_LENGTH) {
- OPENSSL_PUT_ERROR(SSL, SSL_R_DTLS_MESSAGE_TOO_BIG);
- return -1;
- }
-
- if (len < 0) {
- OPENSSL_PUT_ERROR(SSL, SSL_R_BAD_LENGTH);
- return -1;
- }
-
- if (len == 0) {
- return 0;
- }
-
- int ret = dtls1_write_record(ssl, SSL3_RT_APPLICATION_DATA, in, (size_t)len,
- dtls1_use_current_epoch);
- if (ret <= 0) {
- return ret;
- }
- return len;
- }
-
- int dtls1_write_record(SSL *ssl, int type, const uint8_t *in, size_t len,
- enum dtls1_use_epoch_t use_epoch) {
- SSLBuffer *buf = &ssl->s3->write_buffer;
- assert(len <= SSL3_RT_MAX_PLAIN_LENGTH);
- // There should never be a pending write buffer in DTLS. One can't write half
- // a datagram, so the write buffer is always dropped in
- // |ssl_write_buffer_flush|.
- assert(buf->empty());
-
- if (len > SSL3_RT_MAX_PLAIN_LENGTH) {
- OPENSSL_PUT_ERROR(SSL, ERR_R_INTERNAL_ERROR);
- return -1;
- }
-
- size_t ciphertext_len;
- if (!buf->EnsureCap(ssl_seal_align_prefix_len(ssl),
- len + SSL_max_seal_overhead(ssl)) ||
- !dtls_seal_record(ssl, buf->remaining().data(), &ciphertext_len,
- buf->remaining().size(), type, in, len, use_epoch)) {
- buf->Clear();
- return -1;
- }
- buf->DidWrite(ciphertext_len);
-
- int ret = ssl_write_buffer_flush(ssl);
- if (ret <= 0) {
- return ret;
- }
- return 1;
- }
-
- int dtls1_dispatch_alert(SSL *ssl) {
- int ret = dtls1_write_record(ssl, SSL3_RT_ALERT, &ssl->s3->send_alert[0], 2,
- dtls1_use_current_epoch);
- if (ret <= 0) {
- return ret;
- }
- ssl->s3->alert_dispatch = 0;
-
- // If the alert is fatal, flush the BIO now.
- if (ssl->s3->send_alert[0] == SSL3_AL_FATAL) {
- BIO_flush(ssl->wbio);
- }
-
- ssl_do_msg_callback(ssl, 1 /* write */, SSL3_RT_ALERT, ssl->s3->send_alert);
-
- int alert = (ssl->s3->send_alert[0] << 8) | ssl->s3->send_alert[1];
- ssl_do_info_callback(ssl, SSL_CB_WRITE_ALERT, alert);
-
- return 1;
- }
-
- } // namespace bssl
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