2 * Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
4 * Licensed under the OpenSSL license (the "License"). You may not use
5 * this file except in compliance with the License. You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
11 #include <openssl/objects.h>
15 * Parse the client's renegotiation binding and abort if it's not right
17 int ssl_parse_clienthello_renegotiate_ext(SSL *s, PACKET *pkt, int *al)
20 const unsigned char *d;
22 /* Parse the length byte */
23 if (!PACKET_get_1(pkt, &ilen)
24 || !PACKET_get_bytes(pkt, &d, ilen)) {
25 SSLerr(SSL_F_SSL_PARSE_CLIENTHELLO_RENEGOTIATE_EXT,
26 SSL_R_RENEGOTIATION_ENCODING_ERR);
27 *al = SSL_AD_ILLEGAL_PARAMETER;
31 /* Check that the extension matches */
32 if (ilen != s->s3->previous_client_finished_len) {
33 SSLerr(SSL_F_SSL_PARSE_CLIENTHELLO_RENEGOTIATE_EXT,
34 SSL_R_RENEGOTIATION_MISMATCH);
35 *al = SSL_AD_HANDSHAKE_FAILURE;
39 if (memcmp(d, s->s3->previous_client_finished,
40 s->s3->previous_client_finished_len)) {
41 SSLerr(SSL_F_SSL_PARSE_CLIENTHELLO_RENEGOTIATE_EXT,
42 SSL_R_RENEGOTIATION_MISMATCH);
43 *al = SSL_AD_HANDSHAKE_FAILURE;
47 s->s3->send_connection_binding = 1;
52 /* Add the server's renegotiation binding */
53 int ssl_add_serverhello_renegotiate_ext(SSL *s, WPACKET *pkt)
55 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_renegotiate)
56 || !WPACKET_start_sub_packet_u16(pkt)
57 || !WPACKET_start_sub_packet_u8(pkt)
58 || !WPACKET_memcpy(pkt, s->s3->previous_client_finished,
59 s->s3->previous_client_finished_len)
60 || !WPACKET_memcpy(pkt, s->s3->previous_server_finished,
61 s->s3->previous_server_finished_len)
62 || !WPACKET_close(pkt)
63 || !WPACKET_close(pkt))
70 * Parse the server's renegotiation binding and abort if it's not right
72 int ssl_parse_serverhello_renegotiate_ext(SSL *s, PACKET *pkt, int *al)
74 unsigned int expected_len = s->s3->previous_client_finished_len
75 + s->s3->previous_server_finished_len;
77 const unsigned char *data;
79 /* Check for logic errors */
80 OPENSSL_assert(!expected_len || s->s3->previous_client_finished_len);
81 OPENSSL_assert(!expected_len || s->s3->previous_server_finished_len);
83 /* Parse the length byte */
84 if (!PACKET_get_1(pkt, &ilen)) {
85 SSLerr(SSL_F_SSL_PARSE_SERVERHELLO_RENEGOTIATE_EXT,
86 SSL_R_RENEGOTIATION_ENCODING_ERR);
87 *al = SSL_AD_ILLEGAL_PARAMETER;
91 /* Consistency check */
92 if (PACKET_remaining(pkt) != ilen) {
93 SSLerr(SSL_F_SSL_PARSE_SERVERHELLO_RENEGOTIATE_EXT,
94 SSL_R_RENEGOTIATION_ENCODING_ERR);
95 *al = SSL_AD_ILLEGAL_PARAMETER;
99 /* Check that the extension matches */
100 if (ilen != expected_len) {
101 SSLerr(SSL_F_SSL_PARSE_SERVERHELLO_RENEGOTIATE_EXT,
102 SSL_R_RENEGOTIATION_MISMATCH);
103 *al = SSL_AD_HANDSHAKE_FAILURE;
107 if (!PACKET_get_bytes(pkt, &data, s->s3->previous_client_finished_len)
108 || memcmp(data, s->s3->previous_client_finished,
109 s->s3->previous_client_finished_len) != 0) {
110 SSLerr(SSL_F_SSL_PARSE_SERVERHELLO_RENEGOTIATE_EXT,
111 SSL_R_RENEGOTIATION_MISMATCH);
112 *al = SSL_AD_HANDSHAKE_FAILURE;
116 if (!PACKET_get_bytes(pkt, &data, s->s3->previous_server_finished_len)
117 || memcmp(data, s->s3->previous_server_finished,
118 s->s3->previous_server_finished_len) != 0) {
119 SSLerr(SSL_F_SSL_PARSE_SERVERHELLO_RENEGOTIATE_EXT,
120 SSL_R_RENEGOTIATION_MISMATCH);
121 *al = SSL_AD_ILLEGAL_PARAMETER;
124 s->s3->send_connection_binding = 1;