[331] | 1 | /*
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| 2 | * Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
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| 3 | *
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| 4 | * Licensed under the OpenSSL license (the "License"). You may not use
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| 5 | * this file except in compliance with the License. You can obtain a copy
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| 6 | * in the file LICENSE in the source distribution or at
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| 7 | * https://www.openssl.org/source/license.html
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| 8 | */
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| 9 |
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| 10 | #include <stdio.h>
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| 11 | #include <openssl/objects.h>
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| 12 | #include "ssl_locl.h"
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| 13 |
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| 14 | /* Add the client's renegotiation binding */
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| 15 | int ssl_add_clienthello_renegotiate_ext(SSL *s, unsigned char *p, int *len,
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| 16 | int maxlen)
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| 17 | {
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| 18 | if (p) {
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| 19 | if ((s->s3->previous_client_finished_len + 1) > maxlen) {
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| 20 | SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_RENEGOTIATE_EXT,
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| 21 | SSL_R_RENEGOTIATE_EXT_TOO_LONG);
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| 22 | return 0;
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| 23 | }
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| 24 |
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| 25 | /* Length byte */
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| 26 | *p = s->s3->previous_client_finished_len;
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| 27 | p++;
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| 28 |
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| 29 | memcpy(p, s->s3->previous_client_finished,
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| 30 | s->s3->previous_client_finished_len);
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| 31 | }
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| 32 |
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| 33 | *len = s->s3->previous_client_finished_len + 1;
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| 34 |
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| 35 | return 1;
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| 36 | }
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| 37 |
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| 38 | /*
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| 39 | * Parse the client's renegotiation binding and abort if it's not right
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| 40 | */
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| 41 | int ssl_parse_clienthello_renegotiate_ext(SSL *s, PACKET *pkt, int *al)
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| 42 | {
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| 43 | unsigned int ilen;
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| 44 | const unsigned char *d;
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| 45 |
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| 46 | /* Parse the length byte */
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| 47 | if (!PACKET_get_1(pkt, &ilen)
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| 48 | || !PACKET_get_bytes(pkt, &d, ilen)) {
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| 49 | SSLerr(SSL_F_SSL_PARSE_CLIENTHELLO_RENEGOTIATE_EXT,
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| 50 | SSL_R_RENEGOTIATION_ENCODING_ERR);
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| 51 | *al = SSL_AD_ILLEGAL_PARAMETER;
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| 52 | return 0;
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| 53 | }
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| 54 |
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| 55 | /* Check that the extension matches */
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| 56 | if (ilen != s->s3->previous_client_finished_len) {
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| 57 | SSLerr(SSL_F_SSL_PARSE_CLIENTHELLO_RENEGOTIATE_EXT,
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| 58 | SSL_R_RENEGOTIATION_MISMATCH);
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| 59 | *al = SSL_AD_HANDSHAKE_FAILURE;
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| 60 | return 0;
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| 61 | }
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| 62 |
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| 63 | if (memcmp(d, s->s3->previous_client_finished,
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| 64 | s->s3->previous_client_finished_len)) {
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| 65 | SSLerr(SSL_F_SSL_PARSE_CLIENTHELLO_RENEGOTIATE_EXT,
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| 66 | SSL_R_RENEGOTIATION_MISMATCH);
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| 67 | *al = SSL_AD_HANDSHAKE_FAILURE;
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| 68 | return 0;
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| 69 | }
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| 70 |
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| 71 | s->s3->send_connection_binding = 1;
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| 72 |
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| 73 | return 1;
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| 74 | }
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| 75 |
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| 76 | /* Add the server's renegotiation binding */
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| 77 | int ssl_add_serverhello_renegotiate_ext(SSL *s, unsigned char *p, int *len,
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| 78 | int maxlen)
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| 79 | {
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| 80 | if (p) {
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| 81 | if ((s->s3->previous_client_finished_len +
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| 82 | s->s3->previous_server_finished_len + 1) > maxlen) {
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| 83 | SSLerr(SSL_F_SSL_ADD_SERVERHELLO_RENEGOTIATE_EXT,
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| 84 | SSL_R_RENEGOTIATE_EXT_TOO_LONG);
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| 85 | return 0;
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| 86 | }
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| 87 |
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| 88 | /* Length byte */
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| 89 | *p = s->s3->previous_client_finished_len +
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| 90 | s->s3->previous_server_finished_len;
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| 91 | p++;
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| 92 |
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| 93 | memcpy(p, s->s3->previous_client_finished,
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| 94 | s->s3->previous_client_finished_len);
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| 95 | p += s->s3->previous_client_finished_len;
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| 96 |
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| 97 | memcpy(p, s->s3->previous_server_finished,
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| 98 | s->s3->previous_server_finished_len);
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| 99 | }
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| 100 |
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| 101 | *len = s->s3->previous_client_finished_len
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| 102 | + s->s3->previous_server_finished_len + 1;
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| 103 |
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| 104 | return 1;
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| 105 | }
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| 106 |
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| 107 | /*
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| 108 | * Parse the server's renegotiation binding and abort if it's not right
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| 109 | */
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| 110 | int ssl_parse_serverhello_renegotiate_ext(SSL *s, PACKET *pkt, int *al)
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| 111 | {
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| 112 | unsigned int expected_len = s->s3->previous_client_finished_len
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| 113 | + s->s3->previous_server_finished_len;
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| 114 | unsigned int ilen;
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| 115 | const unsigned char *data;
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| 116 |
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| 117 | /* Check for logic errors */
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| 118 | OPENSSL_assert(!expected_len || s->s3->previous_client_finished_len);
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| 119 | OPENSSL_assert(!expected_len || s->s3->previous_server_finished_len);
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| 120 |
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| 121 | /* Parse the length byte */
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| 122 | if (!PACKET_get_1(pkt, &ilen)) {
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| 123 | SSLerr(SSL_F_SSL_PARSE_SERVERHELLO_RENEGOTIATE_EXT,
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| 124 | SSL_R_RENEGOTIATION_ENCODING_ERR);
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| 125 | *al = SSL_AD_ILLEGAL_PARAMETER;
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| 126 | return 0;
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| 127 | }
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| 128 |
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| 129 | /* Consistency check */
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| 130 | if (PACKET_remaining(pkt) != ilen) {
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| 131 | SSLerr(SSL_F_SSL_PARSE_SERVERHELLO_RENEGOTIATE_EXT,
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| 132 | SSL_R_RENEGOTIATION_ENCODING_ERR);
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| 133 | *al = SSL_AD_ILLEGAL_PARAMETER;
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| 134 | return 0;
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| 135 | }
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| 136 |
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| 137 | /* Check that the extension matches */
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| 138 | if (ilen != expected_len) {
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| 139 | SSLerr(SSL_F_SSL_PARSE_SERVERHELLO_RENEGOTIATE_EXT,
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| 140 | SSL_R_RENEGOTIATION_MISMATCH);
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| 141 | *al = SSL_AD_HANDSHAKE_FAILURE;
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| 142 | return 0;
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| 143 | }
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| 144 |
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| 145 | if (!PACKET_get_bytes(pkt, &data, s->s3->previous_client_finished_len)
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| 146 | || memcmp(data, s->s3->previous_client_finished,
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| 147 | s->s3->previous_client_finished_len) != 0) {
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| 148 | SSLerr(SSL_F_SSL_PARSE_SERVERHELLO_RENEGOTIATE_EXT,
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| 149 | SSL_R_RENEGOTIATION_MISMATCH);
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| 150 | *al = SSL_AD_HANDSHAKE_FAILURE;
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| 151 | return 0;
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| 152 | }
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| 153 |
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| 154 | if (!PACKET_get_bytes(pkt, &data, s->s3->previous_server_finished_len)
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| 155 | || memcmp(data, s->s3->previous_server_finished,
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| 156 | s->s3->previous_server_finished_len) != 0) {
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| 157 | SSLerr(SSL_F_SSL_PARSE_SERVERHELLO_RENEGOTIATE_EXT,
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| 158 | SSL_R_RENEGOTIATION_MISMATCH);
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| 159 | *al = SSL_AD_ILLEGAL_PARAMETER;
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| 160 | return 0;
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| 161 | }
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| 162 | s->s3->send_connection_binding = 1;
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| 163 |
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| 164 | return 1;
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| 165 | }
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