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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