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128 lines
4.1 KiB
C
128 lines
4.1 KiB
C
/*
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* Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
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*
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* Licensed under the OpenSSL license (the "License"). You may not use
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* this file except in compliance with the License. You can obtain a copy
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* in the file LICENSE in the source distribution or at
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* https://www.openssl.org/source/license.html
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*/
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#include <stdio.h>
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#include <openssl/objects.h>
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#include "ssl_locl.h"
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/*
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* Parse the client's renegotiation binding and abort if it's not right
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*/
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int ssl_parse_clienthello_renegotiate_ext(SSL *s, PACKET *pkt, int *al)
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{
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unsigned int ilen;
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const unsigned char *d;
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/* Parse the length byte */
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if (!PACKET_get_1(pkt, &ilen)
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|| !PACKET_get_bytes(pkt, &d, ilen)) {
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SSLerr(SSL_F_SSL_PARSE_CLIENTHELLO_RENEGOTIATE_EXT,
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SSL_R_RENEGOTIATION_ENCODING_ERR);
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*al = SSL_AD_ILLEGAL_PARAMETER;
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return 0;
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}
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/* Check that the extension matches */
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if (ilen != s->s3->previous_client_finished_len) {
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SSLerr(SSL_F_SSL_PARSE_CLIENTHELLO_RENEGOTIATE_EXT,
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SSL_R_RENEGOTIATION_MISMATCH);
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*al = SSL_AD_HANDSHAKE_FAILURE;
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return 0;
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}
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if (memcmp(d, s->s3->previous_client_finished,
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s->s3->previous_client_finished_len)) {
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SSLerr(SSL_F_SSL_PARSE_CLIENTHELLO_RENEGOTIATE_EXT,
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SSL_R_RENEGOTIATION_MISMATCH);
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*al = SSL_AD_HANDSHAKE_FAILURE;
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return 0;
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}
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s->s3->send_connection_binding = 1;
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return 1;
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}
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/* Add the server's renegotiation binding */
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int ssl_add_serverhello_renegotiate_ext(SSL *s, WPACKET *pkt)
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{
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if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_renegotiate)
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|| !WPACKET_start_sub_packet_u16(pkt)
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|| !WPACKET_start_sub_packet_u8(pkt)
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|| !WPACKET_memcpy(pkt, s->s3->previous_client_finished,
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s->s3->previous_client_finished_len)
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|| !WPACKET_memcpy(pkt, s->s3->previous_server_finished,
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s->s3->previous_server_finished_len)
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|| !WPACKET_close(pkt)
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|| !WPACKET_close(pkt))
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return 0;
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return 1;
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}
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/*
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* Parse the server's renegotiation binding and abort if it's not right
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*/
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int ssl_parse_serverhello_renegotiate_ext(SSL *s, PACKET *pkt, int *al)
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{
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unsigned int expected_len = s->s3->previous_client_finished_len
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+ s->s3->previous_server_finished_len;
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unsigned int ilen;
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const unsigned char *data;
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/* Check for logic errors */
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OPENSSL_assert(!expected_len || s->s3->previous_client_finished_len);
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OPENSSL_assert(!expected_len || s->s3->previous_server_finished_len);
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/* Parse the length byte */
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if (!PACKET_get_1(pkt, &ilen)) {
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SSLerr(SSL_F_SSL_PARSE_SERVERHELLO_RENEGOTIATE_EXT,
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SSL_R_RENEGOTIATION_ENCODING_ERR);
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*al = SSL_AD_ILLEGAL_PARAMETER;
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return 0;
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}
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/* Consistency check */
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if (PACKET_remaining(pkt) != ilen) {
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SSLerr(SSL_F_SSL_PARSE_SERVERHELLO_RENEGOTIATE_EXT,
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SSL_R_RENEGOTIATION_ENCODING_ERR);
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*al = SSL_AD_ILLEGAL_PARAMETER;
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return 0;
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}
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/* Check that the extension matches */
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if (ilen != expected_len) {
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SSLerr(SSL_F_SSL_PARSE_SERVERHELLO_RENEGOTIATE_EXT,
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SSL_R_RENEGOTIATION_MISMATCH);
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*al = SSL_AD_HANDSHAKE_FAILURE;
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return 0;
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}
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if (!PACKET_get_bytes(pkt, &data, s->s3->previous_client_finished_len)
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|| memcmp(data, s->s3->previous_client_finished,
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s->s3->previous_client_finished_len) != 0) {
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SSLerr(SSL_F_SSL_PARSE_SERVERHELLO_RENEGOTIATE_EXT,
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SSL_R_RENEGOTIATION_MISMATCH);
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*al = SSL_AD_HANDSHAKE_FAILURE;
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return 0;
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}
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if (!PACKET_get_bytes(pkt, &data, s->s3->previous_server_finished_len)
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|| memcmp(data, s->s3->previous_server_finished,
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s->s3->previous_server_finished_len) != 0) {
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SSLerr(SSL_F_SSL_PARSE_SERVERHELLO_RENEGOTIATE_EXT,
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SSL_R_RENEGOTIATION_MISMATCH);
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*al = SSL_AD_ILLEGAL_PARAMETER;
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return 0;
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}
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s->s3->send_connection_binding = 1;
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return 1;
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}
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