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-rw-r--r--src/ssl/dtls_record.c308
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diff --git a/src/ssl/dtls_record.c b/src/ssl/dtls_record.c
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--- a/src/ssl/dtls_record.c
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@@ -1,308 +0,0 @@
-/* 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/bytestring.h>
-#include <openssl/err.h>
-
-#include "internal.h"
-
-
-/* to_u64_be treats |in| as a 8-byte big-endian integer and returns the value as
- * a |uint64_t|. */
-static uint64_t to_u64_be(const uint8_t in[8]) {
- uint64_t ret = 0;
- unsigned i;
- for (i = 0; i < 8; i++) {
- ret <<= 8;
- ret |= in[i];
- }
- return ret;
-}
-
-/* dtls1_bitmap_should_discard returns one if |seq_num| has been seen in |bitmap|
- * or is stale. Otherwise it returns zero. */
-static int dtls1_bitmap_should_discard(DTLS1_BITMAP *bitmap,
- const uint8_t seq_num[8]) {
- const unsigned kWindowSize = sizeof(bitmap->map) * 8;
-
- uint64_t seq_num_u = to_u64_be(seq_num);
- if (seq_num_u > bitmap->max_seq_num) {
- return 0;
- }
- uint64_t idx = bitmap->max_seq_num - seq_num_u;
- return idx >= kWindowSize || (bitmap->map & (((uint64_t)1) << idx));
-}
-
-/* dtls1_bitmap_record updates |bitmap| to record receipt of sequence number
- * |seq_num|. It slides the window forward if needed. It is an error to call
- * this function on a stale sequence number. */
-static void dtls1_bitmap_record(DTLS1_BITMAP *bitmap,
- const uint8_t seq_num[8]) {
- const unsigned kWindowSize = sizeof(bitmap->map) * 8;
-
- uint64_t seq_num_u = to_u64_be(seq_num);
- /* Shift the window if necessary. */
- if (seq_num_u > bitmap->max_seq_num) {
- uint64_t shift = seq_num_u - bitmap->max_seq_num;
- if (shift >= kWindowSize) {
- bitmap->map = 0;
- } else {
- bitmap->map <<= shift;
- }
- bitmap->max_seq_num = seq_num_u;
- }
-
- uint64_t idx = bitmap->max_seq_num - seq_num_u;
- if (idx < kWindowSize) {
- bitmap->map |= ((uint64_t)1) << idx;
- }
-}
-
-enum ssl_open_record_t dtls_open_record(
- SSL *ssl, uint8_t *out_type, uint8_t *out, size_t *out_len,
- size_t *out_consumed, uint8_t *out_alert, size_t max_out, const uint8_t *in,
- size_t in_len) {
- CBS cbs;
- CBS_init(&cbs, in, in_len);
-
- /* Decode the record. */
- uint8_t type;
- uint16_t version;
- uint8_t sequence[8];
- CBS body;
- if (!CBS_get_u8(&cbs, &type) ||
- !CBS_get_u16(&cbs, &version) ||
- !CBS_copy_bytes(&cbs, sequence, 8) ||
- !CBS_get_u16_length_prefixed(&cbs, &body) ||
- (ssl->s3->have_version && version != ssl->version) ||
- (version >> 8) != DTLS1_VERSION_MAJOR ||
- CBS_len(&body) > SSL3_RT_MAX_ENCRYPTED_LENGTH) {
- /* The record header was incomplete or malformed. Drop the entire packet. */
- *out_consumed = in_len;
- return ssl_open_record_discard;
- }
-
- if (ssl->msg_callback != NULL) {
- ssl->msg_callback(0 /* read */, 0, SSL3_RT_HEADER, in,
- DTLS1_RT_HEADER_LENGTH, ssl, ssl->msg_callback_arg);
- }
-
- uint16_t epoch = (((uint16_t)sequence[0]) << 8) | sequence[1];
- if (epoch != ssl->d1->r_epoch ||
- dtls1_bitmap_should_discard(&ssl->d1->bitmap, sequence)) {
- /* Drop this record. It's from the wrong epoch or is a replay. Note that if
- * |epoch| is the next epoch, the record could be buffered for later. For
- * simplicity, drop it and expect retransmit to handle it later; DTLS must
- * handle packet loss anyway. */
- *out_consumed = in_len - CBS_len(&cbs);
- return ssl_open_record_discard;
- }
-
- /* Decrypt the body. */
- size_t plaintext_len;
- if (!SSL_AEAD_CTX_open(ssl->aead_read_ctx, out, &plaintext_len, max_out,
- type, version, sequence, CBS_data(&body),
- CBS_len(&body))) {
- /* Bad packets are silently dropped in DTLS. See section 4.2.1 of RFC 6347.
- * Clear the error queue of any errors decryption may have added. Drop the
- * entire packet as it must not have come from the peer.
- *
- * TODO(davidben): This doesn't distinguish malloc failures from encryption
- * failures. */
- ERR_clear_error();
- *out_consumed = in_len - CBS_len(&cbs);
- return ssl_open_record_discard;
- }
-
- /* Check the plaintext length. */
- if (plaintext_len > SSL3_RT_MAX_PLAIN_LENGTH) {
- OPENSSL_PUT_ERROR(SSL, SSL_R_DATA_LENGTH_TOO_LONG);
- *out_alert = SSL_AD_RECORD_OVERFLOW;
- return ssl_open_record_error;
- }
-
- dtls1_bitmap_record(&ssl->d1->bitmap, sequence);
-
- /* TODO(davidben): Limit the number of empty records as in TLS? This is only
- * useful if we also limit discarded packets. */
-
- *out_type = type;
- *out_len = plaintext_len;
- *out_consumed = in_len - CBS_len(&cbs);
- return ssl_open_record_success;
-}
-
-int dtls_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,
- enum dtls1_use_epoch_t use_epoch) {
- /* Determine the parameters for the current epoch. */
- uint16_t epoch = ssl->d1->w_epoch;
- SSL_AEAD_CTX *aead = ssl->aead_write_ctx;
- uint8_t *seq = ssl->s3->write_sequence;
- if (use_epoch == dtls1_use_previous_epoch) {
- /* DTLS renegotiation is unsupported, so only epochs 0 (NULL cipher) and 1
- * (negotiated cipher) exist. */
- assert(ssl->d1->w_epoch == 1);
- epoch = ssl->d1->w_epoch - 1;
- aead = NULL;
- seq = ssl->d1->last_write_sequence;
- }
-
- if (max_out < DTLS1_RT_HEADER_LENGTH) {
- OPENSSL_PUT_ERROR(SSL, SSL_R_BUFFER_TOO_SMALL);
- return 0;
- }
- /* Check the record header does not alias any part of the input.
- * |SSL_AEAD_CTX_seal| will internally enforce other aliasing requirements. */
- if (in < out + DTLS1_RT_HEADER_LENGTH && out < in + in_len) {
- OPENSSL_PUT_ERROR(SSL, SSL_R_OUTPUT_ALIASES_INPUT);
- return 0;
- }
-
- out[0] = type;
-
- uint16_t wire_version = ssl->s3->have_version ? ssl->version : DTLS1_VERSION;
- out[1] = wire_version >> 8;
- out[2] = wire_version & 0xff;
-
- out[3] = epoch >> 8;
- out[4] = epoch & 0xff;
- memcpy(&out[5], &seq[2], 6);
-
- size_t ciphertext_len;
- if (!SSL_AEAD_CTX_seal(aead, out + DTLS1_RT_HEADER_LENGTH, &ciphertext_len,
- max_out - DTLS1_RT_HEADER_LENGTH, type, wire_version,
- &out[3] /* seq */, in, in_len) ||
- !ssl3_record_sequence_update(&seq[2], 6)) {
- return 0;
- }
-
- if (ciphertext_len >= 1 << 16) {
- OPENSSL_PUT_ERROR(SSL, ERR_R_OVERFLOW);
- return 0;
- }
- out[11] = ciphertext_len >> 8;
- out[12] = ciphertext_len & 0xff;
-
- *out_len = DTLS1_RT_HEADER_LENGTH + ciphertext_len;
-
- if (ssl->msg_callback) {
- ssl->msg_callback(1 /* write */, 0, SSL3_RT_HEADER, out,
- DTLS1_RT_HEADER_LENGTH, ssl, ssl->msg_callback_arg);
- }
-
- return 1;
-}
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