--- /dev/null
+/* 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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