/* 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_grpc/ssl.h> #include <assert.h> #include <string.h> #include <openssl_grpc/bio.h> #include <openssl_grpc/bytestring.h> #include <openssl_grpc/mem.h> #include <openssl_grpc/evp.h> #include <openssl_grpc/err.h> #include <openssl_grpc/rand.h> #include "../crypto/internal.h" #include "internal.h" BSSL_NAMESPACE_BEGIN 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 = false; // If the alert is fatal, flush the BIO now. if (ssl->s3->send_alert[0] == SSL3_AL_FATAL) { BIO_flush(ssl->wbio.get()); } 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; } BSSL_NAMESPACE_END