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1 /* ssl/d1_pkt.c */ |
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2 /* |
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3 * DTLS implementation written by Nagendra Modadugu |
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4 * (nagendra@cs.stanford.edu) for the OpenSSL project 2005. |
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5 */ |
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6 /* ==================================================================== |
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7 * Copyright (c) 1998-2005 The OpenSSL Project. All rights reserved. |
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8 * |
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9 * Redistribution and use in source and binary forms, with or without |
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10 * modification, are permitted provided that the following conditions |
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11 * are met: |
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12 * |
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13 * 1. Redistributions of source code must retain the above copyright |
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14 * notice, this list of conditions and the following disclaimer. |
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15 * |
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16 * 2. Redistributions in binary form must reproduce the above copyright |
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17 * notice, this list of conditions and the following disclaimer in |
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18 * the documentation and/or other materials provided with the |
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19 * distribution. |
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20 * |
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21 * 3. All advertising materials mentioning features or use of this |
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22 * software must display the following acknowledgment: |
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23 * "This product includes software developed by the OpenSSL Project |
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24 * for use in the OpenSSL Toolkit. (http://www.openssl.org/)" |
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25 * |
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26 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to |
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27 * endorse or promote products derived from this software without |
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28 * prior written permission. For written permission, please contact |
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29 * openssl-core@openssl.org. |
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30 * |
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31 * 5. Products derived from this software may not be called "OpenSSL" |
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32 * nor may "OpenSSL" appear in their names without prior written |
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33 * permission of the OpenSSL Project. |
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34 * |
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35 * 6. Redistributions of any form whatsoever must retain the following |
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36 * acknowledgment: |
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37 * "This product includes software developed by the OpenSSL Project |
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38 * for use in the OpenSSL Toolkit (http://www.openssl.org/)" |
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39 * |
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40 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY |
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41 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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42 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
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43 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR |
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44 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
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45 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
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46 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
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47 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, |
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49 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
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50 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED |
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51 * OF THE POSSIBILITY OF SUCH DAMAGE. |
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52 * ==================================================================== |
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53 * |
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54 * This product includes cryptographic software written by Eric Young |
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55 * (eay@cryptsoft.com). This product includes software written by Tim |
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56 * Hudson (tjh@cryptsoft.com). |
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57 * |
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58 */ |
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59 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) |
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60 * All rights reserved. |
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61 * |
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62 * This package is an SSL implementation written |
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63 * by Eric Young (eay@cryptsoft.com). |
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64 * The implementation was written so as to conform with Netscapes SSL. |
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65 * |
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66 * This library is free for commercial and non-commercial use as long as |
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67 * the following conditions are aheared to. The following conditions |
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68 * apply to all code found in this distribution, be it the RC4, RSA, |
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69 * lhash, DES, etc., code; not just the SSL code. The SSL documentation |
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70 * included with this distribution is covered by the same copyright terms |
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71 * except that the holder is Tim Hudson (tjh@cryptsoft.com). |
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72 * |
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73 * Copyright remains Eric Young's, and as such any Copyright notices in |
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74 * the code are not to be removed. |
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75 * If this package is used in a product, Eric Young should be given attribution |
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76 * as the author of the parts of the library used. |
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77 * This can be in the form of a textual message at program startup or |
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78 * in documentation (online or textual) provided with the package. |
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79 * |
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80 * Redistribution and use in source and binary forms, with or without |
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81 * modification, are permitted provided that the following conditions |
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82 * are met: |
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83 * 1. Redistributions of source code must retain the copyright |
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84 * notice, this list of conditions and the following disclaimer. |
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85 * 2. Redistributions in binary form must reproduce the above copyright |
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86 * notice, this list of conditions and the following disclaimer in the |
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87 * documentation and/or other materials provided with the distribution. |
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88 * 3. All advertising materials mentioning features or use of this software |
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89 * must display the following acknowledgement: |
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90 * "This product includes cryptographic software written by |
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91 * Eric Young (eay@cryptsoft.com)" |
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92 * The word 'cryptographic' can be left out if the rouines from the library |
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93 * being used are not cryptographic related :-). |
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94 * 4. If you include any Windows specific code (or a derivative thereof) from |
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95 * the apps directory (application code) you must include an acknowledgement: |
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96 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" |
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97 * |
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98 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND |
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99 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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100 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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101 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE |
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102 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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103 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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104 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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105 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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106 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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107 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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108 * SUCH DAMAGE. |
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109 * |
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110 * The licence and distribution terms for any publically available version or |
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111 * derivative of this code cannot be changed. i.e. this code cannot simply be |
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112 * copied and put under another distribution licence |
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113 * [including the GNU Public Licence.] |
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114 */ |
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115 |
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116 #include <stdio.h> |
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117 #include <errno.h> |
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118 #define USE_SOCKETS |
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119 #include "ssl_locl.h" |
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120 #include <openssl/evp.h> |
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121 #include <openssl/buffer.h> |
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122 #include <openssl/pqueue.h> |
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123 #include <openssl/rand.h> |
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124 |
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125 static int have_handshake_fragment(SSL *s, int type, unsigned char *buf, |
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126 int len, int peek); |
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127 static int dtls1_record_replay_check(SSL *s, DTLS1_BITMAP *bitmap, |
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128 PQ_64BIT *seq_num); |
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129 static void dtls1_record_bitmap_update(SSL *s, DTLS1_BITMAP *bitmap); |
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130 static DTLS1_BITMAP *dtls1_get_bitmap(SSL *s, SSL3_RECORD *rr, |
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131 unsigned int *is_next_epoch); |
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132 #if 0 |
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133 static int dtls1_record_needs_buffering(SSL *s, SSL3_RECORD *rr, |
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134 unsigned short *priority, unsigned long *offset); |
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135 #endif |
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136 static int dtls1_buffer_record(SSL *s, record_pqueue *q, |
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137 PQ_64BIT priority); |
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138 static int dtls1_process_record(SSL *s); |
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139 #if PQ_64BIT_IS_INTEGER |
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140 static PQ_64BIT bytes_to_long_long(unsigned char *bytes, PQ_64BIT *num); |
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141 #endif |
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142 static void dtls1_clear_timeouts(SSL *s); |
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143 |
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144 /* copy buffered record into SSL structure */ |
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145 static int |
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146 dtls1_copy_record(SSL *s, pitem *item) |
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147 { |
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148 DTLS1_RECORD_DATA *rdata; |
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149 |
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150 rdata = (DTLS1_RECORD_DATA *)item->data; |
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151 |
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152 if (s->s3->rbuf.buf != NULL) |
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153 OPENSSL_free(s->s3->rbuf.buf); |
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154 |
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155 s->packet = rdata->packet; |
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156 s->packet_length = rdata->packet_length; |
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157 memcpy(&(s->s3->rbuf), &(rdata->rbuf), sizeof(SSL3_BUFFER)); |
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158 memcpy(&(s->s3->rrec), &(rdata->rrec), sizeof(SSL3_RECORD)); |
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159 |
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160 return(1); |
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161 } |
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162 |
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163 |
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164 static int |
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165 dtls1_buffer_record(SSL *s, record_pqueue *queue, PQ_64BIT priority) |
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166 { |
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167 DTLS1_RECORD_DATA *rdata; |
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168 pitem *item; |
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169 |
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170 rdata = OPENSSL_malloc(sizeof(DTLS1_RECORD_DATA)); |
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171 item = pitem_new(priority, rdata); |
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172 if (rdata == NULL || item == NULL) |
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173 { |
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174 if (rdata != NULL) OPENSSL_free(rdata); |
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175 if (item != NULL) pitem_free(item); |
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176 |
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177 SSLerr(SSL_F_DTLS1_BUFFER_RECORD, ERR_R_INTERNAL_ERROR); |
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178 return(0); |
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179 } |
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180 |
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181 rdata->packet = s->packet; |
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182 rdata->packet_length = s->packet_length; |
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183 memcpy(&(rdata->rbuf), &(s->s3->rbuf), sizeof(SSL3_BUFFER)); |
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184 memcpy(&(rdata->rrec), &(s->s3->rrec), sizeof(SSL3_RECORD)); |
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185 |
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186 item->data = rdata; |
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187 |
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188 /* insert should not fail, since duplicates are dropped */ |
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189 if (pqueue_insert(queue->q, item) == NULL) |
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190 { |
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191 OPENSSL_free(rdata); |
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192 pitem_free(item); |
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193 return(0); |
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194 } |
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195 |
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196 s->packet = NULL; |
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197 s->packet_length = 0; |
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198 memset(&(s->s3->rbuf), 0, sizeof(SSL3_BUFFER)); |
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199 memset(&(s->s3->rrec), 0, sizeof(SSL3_RECORD)); |
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200 |
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201 if (!ssl3_setup_buffers(s)) |
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202 { |
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203 SSLerr(SSL_F_DTLS1_BUFFER_RECORD, ERR_R_INTERNAL_ERROR); |
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204 OPENSSL_free(rdata); |
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205 pitem_free(item); |
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206 return(0); |
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207 } |
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208 |
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209 return(1); |
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210 } |
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211 |
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212 |
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213 static int |
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214 dtls1_retrieve_buffered_record(SSL *s, record_pqueue *queue) |
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215 { |
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216 pitem *item; |
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217 |
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218 item = pqueue_pop(queue->q); |
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219 if (item) |
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220 { |
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221 dtls1_copy_record(s, item); |
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222 |
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223 OPENSSL_free(item->data); |
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224 pitem_free(item); |
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225 |
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226 return(1); |
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227 } |
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228 |
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229 return(0); |
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230 } |
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231 |
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232 |
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233 /* retrieve a buffered record that belongs to the new epoch, i.e., not processed |
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234 * yet */ |
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235 #define dtls1_get_unprocessed_record(s) \ |
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236 dtls1_retrieve_buffered_record((s), \ |
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237 &((s)->d1->unprocessed_rcds)) |
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238 |
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239 /* retrieve a buffered record that belongs to the current epoch, ie, processed */ |
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240 #define dtls1_get_processed_record(s) \ |
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241 dtls1_retrieve_buffered_record((s), \ |
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242 &((s)->d1->processed_rcds)) |
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243 |
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244 static int |
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245 dtls1_process_buffered_records(SSL *s) |
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246 { |
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247 pitem *item; |
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248 |
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249 item = pqueue_peek(s->d1->unprocessed_rcds.q); |
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250 if (item) |
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251 { |
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252 DTLS1_RECORD_DATA *rdata; |
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253 rdata = (DTLS1_RECORD_DATA *)item->data; |
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254 |
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255 /* Check if epoch is current. */ |
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256 if (s->d1->unprocessed_rcds.epoch != s->d1->r_epoch) |
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257 return(1); /* Nothing to do. */ |
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258 |
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259 /* Process all the records. */ |
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260 while (pqueue_peek(s->d1->unprocessed_rcds.q)) |
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261 { |
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262 dtls1_get_unprocessed_record(s); |
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263 if ( ! dtls1_process_record(s)) |
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264 return(0); |
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265 dtls1_buffer_record(s, &(s->d1->processed_rcds), |
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266 s->s3->rrec.seq_num); |
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267 } |
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268 } |
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269 |
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270 /* sync epoch numbers once all the unprocessed records |
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271 * have been processed */ |
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272 s->d1->processed_rcds.epoch = s->d1->r_epoch; |
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273 s->d1->unprocessed_rcds.epoch = s->d1->r_epoch + 1; |
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274 |
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275 return(1); |
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276 } |
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277 |
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278 |
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279 #if 0 |
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280 |
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281 static int |
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282 dtls1_get_buffered_record(SSL *s) |
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283 { |
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284 pitem *item; |
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285 PQ_64BIT priority = |
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286 (((PQ_64BIT)s->d1->handshake_read_seq) << 32) | |
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287 ((PQ_64BIT)s->d1->r_msg_hdr.frag_off); |
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288 |
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289 if ( ! SSL_in_init(s)) /* if we're not (re)negotiating, |
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290 nothing buffered */ |
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291 return 0; |
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292 |
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293 |
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294 item = pqueue_peek(s->d1->rcvd_records); |
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295 if (item && item->priority == priority) |
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296 { |
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297 /* Check if we've received the record of interest. It must be |
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298 * a handshake record, since data records as passed up without |
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299 * buffering */ |
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300 DTLS1_RECORD_DATA *rdata; |
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301 item = pqueue_pop(s->d1->rcvd_records); |
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302 rdata = (DTLS1_RECORD_DATA *)item->data; |
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303 |
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304 if (s->s3->rbuf.buf != NULL) |
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305 OPENSSL_free(s->s3->rbuf.buf); |
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306 |
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307 s->packet = rdata->packet; |
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308 s->packet_length = rdata->packet_length; |
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309 memcpy(&(s->s3->rbuf), &(rdata->rbuf), sizeof(SSL3_BUFFER)); |
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310 memcpy(&(s->s3->rrec), &(rdata->rrec), sizeof(SSL3_RECORD)); |
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311 |
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312 OPENSSL_free(item->data); |
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313 pitem_free(item); |
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314 |
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315 /* s->d1->next_expected_seq_num++; */ |
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316 return(1); |
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317 } |
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318 |
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319 return 0; |
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320 } |
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321 |
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322 #endif |
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323 |
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324 static int |
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325 dtls1_process_record(SSL *s) |
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326 { |
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327 int i,al; |
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328 int clear=0; |
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329 int enc_err; |
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330 SSL_SESSION *sess; |
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331 SSL3_RECORD *rr; |
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332 unsigned int mac_size; |
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333 unsigned char md[EVP_MAX_MD_SIZE]; |
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334 |
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335 |
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336 rr= &(s->s3->rrec); |
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337 sess = s->session; |
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338 |
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339 /* At this point, s->packet_length == SSL3_RT_HEADER_LNGTH + rr->length, |
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340 * and we have that many bytes in s->packet |
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341 */ |
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342 rr->input= &(s->packet[DTLS1_RT_HEADER_LENGTH]); |
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343 |
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344 /* ok, we can now read from 's->packet' data into 'rr' |
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345 * rr->input points at rr->length bytes, which |
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346 * need to be copied into rr->data by either |
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347 * the decryption or by the decompression |
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348 * When the data is 'copied' into the rr->data buffer, |
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349 * rr->input will be pointed at the new buffer */ |
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350 |
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351 /* We now have - encrypted [ MAC [ compressed [ plain ] ] ] |
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352 * rr->length bytes of encrypted compressed stuff. */ |
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353 |
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354 /* check is not needed I believe */ |
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355 if (rr->length > SSL3_RT_MAX_ENCRYPTED_LENGTH) |
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356 { |
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357 al=SSL_AD_RECORD_OVERFLOW; |
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358 SSLerr(SSL_F_DTLS1_PROCESS_RECORD,SSL_R_ENCRYPTED_LENGTH_TOO_LONG); |
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359 goto f_err; |
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360 } |
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361 |
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362 /* decrypt in place in 'rr->input' */ |
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363 rr->data=rr->input; |
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364 |
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365 enc_err = s->method->ssl3_enc->enc(s,0); |
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366 if (enc_err <= 0) |
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367 { |
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368 if (enc_err == 0) |
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369 /* SSLerr() and ssl3_send_alert() have been called */ |
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370 goto err; |
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371 |
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372 /* otherwise enc_err == -1 */ |
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373 goto decryption_failed_or_bad_record_mac; |
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374 } |
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375 |
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376 #ifdef TLS_DEBUG |
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377 printf("dec %d\n",rr->length); |
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378 { unsigned int z; for (z=0; z<rr->length; z++) printf("%02X%c",rr->data[z],((z+1)%16)?' ':'\n'); } |
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379 printf("\n"); |
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380 #endif |
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381 |
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382 /* r->length is now the compressed data plus mac */ |
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383 if ( (sess == NULL) || |
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384 (s->enc_read_ctx == NULL) || |
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385 (s->read_hash == NULL)) |
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386 clear=1; |
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387 |
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388 if (!clear) |
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389 { |
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390 mac_size=EVP_MD_size(s->read_hash); |
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391 |
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392 if (rr->length > SSL3_RT_MAX_COMPRESSED_LENGTH+mac_size) |
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393 { |
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394 #if 0 /* OK only for stream ciphers (then rr->length is visible from ciphertext anyway) */ |
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395 al=SSL_AD_RECORD_OVERFLOW; |
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396 SSLerr(SSL_F_DTLS1_PROCESS_RECORD,SSL_R_PRE_MAC_LENGTH_TOO_LONG); |
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397 goto f_err; |
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398 #else |
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399 goto decryption_failed_or_bad_record_mac; |
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400 #endif |
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401 } |
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402 /* check the MAC for rr->input (it's in mac_size bytes at the tail) */ |
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403 if (rr->length < mac_size) |
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404 { |
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405 #if 0 /* OK only for stream ciphers */ |
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406 al=SSL_AD_DECODE_ERROR; |
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407 SSLerr(SSL_F_DTLS1_PROCESS_RECORD,SSL_R_LENGTH_TOO_SHORT); |
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408 goto f_err; |
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409 #else |
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410 goto decryption_failed_or_bad_record_mac; |
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411 #endif |
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412 } |
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413 rr->length-=mac_size; |
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414 i=s->method->ssl3_enc->mac(s,md,0); |
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415 if (memcmp(md,&(rr->data[rr->length]),mac_size) != 0) |
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416 { |
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417 goto decryption_failed_or_bad_record_mac; |
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418 } |
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419 } |
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420 |
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421 /* r->length is now just compressed */ |
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422 if (s->expand != NULL) |
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423 { |
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424 if (rr->length > SSL3_RT_MAX_COMPRESSED_LENGTH) |
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425 { |
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426 al=SSL_AD_RECORD_OVERFLOW; |
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427 SSLerr(SSL_F_DTLS1_PROCESS_RECORD,SSL_R_COMPRESSED_LENGTH_TOO_LONG); |
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428 goto f_err; |
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429 } |
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430 if (!ssl3_do_uncompress(s)) |
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431 { |
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432 al=SSL_AD_DECOMPRESSION_FAILURE; |
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433 SSLerr(SSL_F_DTLS1_PROCESS_RECORD,SSL_R_BAD_DECOMPRESSION); |
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434 goto f_err; |
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435 } |
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436 } |
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437 |
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438 if (rr->length > SSL3_RT_MAX_PLAIN_LENGTH) |
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439 { |
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440 al=SSL_AD_RECORD_OVERFLOW; |
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441 SSLerr(SSL_F_DTLS1_PROCESS_RECORD,SSL_R_DATA_LENGTH_TOO_LONG); |
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442 goto f_err; |
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443 } |
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444 |
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445 rr->off=0; |
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446 /* So at this point the following is true |
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447 * ssl->s3->rrec.type is the type of record |
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448 * ssl->s3->rrec.length == number of bytes in record |
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449 * ssl->s3->rrec.off == offset to first valid byte |
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450 * ssl->s3->rrec.data == where to take bytes from, increment |
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451 * after use :-). |
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452 */ |
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453 |
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454 /* we have pulled in a full packet so zero things */ |
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455 s->packet_length=0; |
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456 dtls1_record_bitmap_update(s, &(s->d1->bitmap));/* Mark receipt of record. */ |
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457 return(1); |
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458 |
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459 decryption_failed_or_bad_record_mac: |
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460 /* Separate 'decryption_failed' alert was introduced with TLS 1.0, |
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461 * SSL 3.0 only has 'bad_record_mac'. But unless a decryption |
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462 * failure is directly visible from the ciphertext anyway, |
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463 * we should not reveal which kind of error occured -- this |
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464 * might become visible to an attacker (e.g. via logfile) */ |
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465 al=SSL_AD_BAD_RECORD_MAC; |
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466 SSLerr(SSL_F_DTLS1_PROCESS_RECORD,SSL_R_DECRYPTION_FAILED_OR_BAD_RECORD_MAC); |
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467 f_err: |
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468 ssl3_send_alert(s,SSL3_AL_FATAL,al); |
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469 err: |
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470 return(0); |
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471 } |
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472 |
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473 |
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474 /* Call this to get a new input record. |
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475 * It will return <= 0 if more data is needed, normally due to an error |
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476 * or non-blocking IO. |
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477 * When it finishes, one packet has been decoded and can be found in |
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478 * ssl->s3->rrec.type - is the type of record |
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479 * ssl->s3->rrec.data, - data |
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480 * ssl->s3->rrec.length, - number of bytes |
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481 */ |
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482 /* used only by dtls1_read_bytes */ |
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483 int dtls1_get_record(SSL *s) |
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484 { |
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485 int ssl_major,ssl_minor,al; |
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486 int i,n; |
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487 SSL3_RECORD *rr; |
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488 SSL_SESSION *sess; |
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489 unsigned char *p; |
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490 unsigned short version; |
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491 DTLS1_BITMAP *bitmap; |
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492 unsigned int is_next_epoch; |
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493 |
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494 rr= &(s->s3->rrec); |
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495 sess=s->session; |
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496 |
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497 /* The epoch may have changed. If so, process all the |
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498 * pending records. This is a non-blocking operation. */ |
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499 if ( ! dtls1_process_buffered_records(s)) |
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500 return 0; |
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501 |
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502 /* if we're renegotiating, then there may be buffered records */ |
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503 if (dtls1_get_processed_record(s)) |
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504 return 1; |
|
505 |
|
506 /* get something from the wire */ |
|
507 again: |
|
508 /* check if we have the header */ |
|
509 if ( (s->rstate != SSL_ST_READ_BODY) || |
|
510 (s->packet_length < DTLS1_RT_HEADER_LENGTH)) |
|
511 { |
|
512 n=ssl3_read_n(s, DTLS1_RT_HEADER_LENGTH, s->s3->rbuf.len, 0); |
|
513 /* read timeout is handled by dtls1_read_bytes */ |
|
514 if (n <= 0) return(n); /* error or non-blocking */ |
|
515 |
|
516 OPENSSL_assert(s->packet_length == DTLS1_RT_HEADER_LENGTH); |
|
517 |
|
518 s->rstate=SSL_ST_READ_BODY; |
|
519 |
|
520 p=s->packet; |
|
521 |
|
522 /* Pull apart the header into the DTLS1_RECORD */ |
|
523 rr->type= *(p++); |
|
524 ssl_major= *(p++); |
|
525 ssl_minor= *(p++); |
|
526 version=(ssl_major<<8)|ssl_minor; |
|
527 |
|
528 /* sequence number is 64 bits, with top 2 bytes = epoch */ |
|
529 n2s(p,rr->epoch); |
|
530 |
|
531 memcpy(&(s->s3->read_sequence[2]), p, 6); |
|
532 p+=6; |
|
533 |
|
534 n2s(p,rr->length); |
|
535 |
|
536 /* Lets check version */ |
|
537 if (!s->first_packet) |
|
538 { |
|
539 if (version != s->version && version != DTLS1_BAD_VER) |
|
540 { |
|
541 SSLerr(SSL_F_DTLS1_GET_RECORD,SSL_R_WRONG_VERSION_NUMBER); |
|
542 /* Send back error using their |
|
543 * version number :-) */ |
|
544 s->version=version; |
|
545 al=SSL_AD_PROTOCOL_VERSION; |
|
546 goto f_err; |
|
547 } |
|
548 } |
|
549 |
|
550 if ((version & 0xff00) != (DTLS1_VERSION & 0xff00) && |
|
551 (version & 0xff00) != (DTLS1_BAD_VER & 0xff00)) |
|
552 { |
|
553 SSLerr(SSL_F_DTLS1_GET_RECORD,SSL_R_WRONG_VERSION_NUMBER); |
|
554 goto err; |
|
555 } |
|
556 |
|
557 if (rr->length > SSL3_RT_MAX_ENCRYPTED_LENGTH) |
|
558 { |
|
559 al=SSL_AD_RECORD_OVERFLOW; |
|
560 SSLerr(SSL_F_DTLS1_GET_RECORD,SSL_R_PACKET_LENGTH_TOO_LONG); |
|
561 goto f_err; |
|
562 } |
|
563 |
|
564 s->client_version = version; |
|
565 /* now s->rstate == SSL_ST_READ_BODY */ |
|
566 } |
|
567 |
|
568 /* s->rstate == SSL_ST_READ_BODY, get and decode the data */ |
|
569 |
|
570 if (rr->length > s->packet_length-DTLS1_RT_HEADER_LENGTH) |
|
571 { |
|
572 /* now s->packet_length == DTLS1_RT_HEADER_LENGTH */ |
|
573 i=rr->length; |
|
574 n=ssl3_read_n(s,i,i,1); |
|
575 if (n <= 0) return(n); /* error or non-blocking io */ |
|
576 |
|
577 /* this packet contained a partial record, dump it */ |
|
578 if ( n != i) |
|
579 { |
|
580 s->packet_length = 0; |
|
581 goto again; |
|
582 } |
|
583 |
|
584 /* now n == rr->length, |
|
585 * and s->packet_length == DTLS1_RT_HEADER_LENGTH + rr->length */ |
|
586 } |
|
587 s->rstate=SSL_ST_READ_HEADER; /* set state for later operations */ |
|
588 |
|
589 /* match epochs. NULL means the packet is dropped on the floor */ |
|
590 bitmap = dtls1_get_bitmap(s, rr, &is_next_epoch); |
|
591 if ( bitmap == NULL) |
|
592 { |
|
593 s->packet_length = 0; /* dump this record */ |
|
594 goto again; /* get another record */ |
|
595 } |
|
596 |
|
597 /* check whether this is a repeat, or aged record */ |
|
598 if ( ! dtls1_record_replay_check(s, bitmap, &(rr->seq_num))) |
|
599 { |
|
600 s->packet_length=0; /* dump this record */ |
|
601 goto again; /* get another record */ |
|
602 } |
|
603 |
|
604 /* just read a 0 length packet */ |
|
605 if (rr->length == 0) goto again; |
|
606 |
|
607 /* If this record is from the next epoch (either HM or ALERT), buffer it |
|
608 * since it cannot be processed at this time. |
|
609 * Records from the next epoch are marked as received even though they are |
|
610 * not processed, so as to prevent any potential resource DoS attack */ |
|
611 if (is_next_epoch) |
|
612 { |
|
613 dtls1_record_bitmap_update(s, bitmap); |
|
614 dtls1_buffer_record(s, &(s->d1->unprocessed_rcds), rr->seq_num); |
|
615 s->packet_length = 0; |
|
616 goto again; |
|
617 } |
|
618 |
|
619 if ( ! dtls1_process_record(s)) |
|
620 return(0); |
|
621 |
|
622 dtls1_clear_timeouts(s); /* done waiting */ |
|
623 return(1); |
|
624 |
|
625 f_err: |
|
626 ssl3_send_alert(s,SSL3_AL_FATAL,al); |
|
627 err: |
|
628 return(0); |
|
629 } |
|
630 |
|
631 /* Return up to 'len' payload bytes received in 'type' records. |
|
632 * 'type' is one of the following: |
|
633 * |
|
634 * - SSL3_RT_HANDSHAKE (when ssl3_get_message calls us) |
|
635 * - SSL3_RT_APPLICATION_DATA (when ssl3_read calls us) |
|
636 * - 0 (during a shutdown, no data has to be returned) |
|
637 * |
|
638 * If we don't have stored data to work from, read a SSL/TLS record first |
|
639 * (possibly multiple records if we still don't have anything to return). |
|
640 * |
|
641 * This function must handle any surprises the peer may have for us, such as |
|
642 * Alert records (e.g. close_notify), ChangeCipherSpec records (not really |
|
643 * a surprise, but handled as if it were), or renegotiation requests. |
|
644 * Also if record payloads contain fragments too small to process, we store |
|
645 * them until there is enough for the respective protocol (the record protocol |
|
646 * may use arbitrary fragmentation and even interleaving): |
|
647 * Change cipher spec protocol |
|
648 * just 1 byte needed, no need for keeping anything stored |
|
649 * Alert protocol |
|
650 * 2 bytes needed (AlertLevel, AlertDescription) |
|
651 * Handshake protocol |
|
652 * 4 bytes needed (HandshakeType, uint24 length) -- we just have |
|
653 * to detect unexpected Client Hello and Hello Request messages |
|
654 * here, anything else is handled by higher layers |
|
655 * Application data protocol |
|
656 * none of our business |
|
657 */ |
|
658 int dtls1_read_bytes(SSL *s, int type, unsigned char *buf, int len, int peek) |
|
659 { |
|
660 int al,i,j,ret; |
|
661 unsigned int n; |
|
662 SSL3_RECORD *rr; |
|
663 void (*cb)(const SSL *ssl,int type2,int val)=NULL; |
|
664 |
|
665 if (s->s3->rbuf.buf == NULL) /* Not initialized yet */ |
|
666 if (!ssl3_setup_buffers(s)) |
|
667 return(-1); |
|
668 |
|
669 /* XXX: check what the second '&& type' is about */ |
|
670 if ((type && (type != SSL3_RT_APPLICATION_DATA) && |
|
671 (type != SSL3_RT_HANDSHAKE) && type) || |
|
672 (peek && (type != SSL3_RT_APPLICATION_DATA))) |
|
673 { |
|
674 SSLerr(SSL_F_DTLS1_READ_BYTES, ERR_R_INTERNAL_ERROR); |
|
675 return -1; |
|
676 } |
|
677 |
|
678 /* check whether there's a handshake message (client hello?) waiting */ |
|
679 if ( (ret = have_handshake_fragment(s, type, buf, len, peek))) |
|
680 return ret; |
|
681 |
|
682 /* Now s->d1->handshake_fragment_len == 0 if type == SSL3_RT_HANDSHAKE. */ |
|
683 |
|
684 if (!s->in_handshake && SSL_in_init(s)) |
|
685 { |
|
686 /* type == SSL3_RT_APPLICATION_DATA */ |
|
687 i=s->handshake_func(s); |
|
688 if (i < 0) return(i); |
|
689 if (i == 0) |
|
690 { |
|
691 SSLerr(SSL_F_DTLS1_READ_BYTES,SSL_R_SSL_HANDSHAKE_FAILURE); |
|
692 return(-1); |
|
693 } |
|
694 } |
|
695 |
|
696 start: |
|
697 s->rwstate=SSL_NOTHING; |
|
698 |
|
699 /* s->s3->rrec.type - is the type of record |
|
700 * s->s3->rrec.data, - data |
|
701 * s->s3->rrec.off, - offset into 'data' for next read |
|
702 * s->s3->rrec.length, - number of bytes. */ |
|
703 rr = &(s->s3->rrec); |
|
704 |
|
705 /* get new packet if necessary */ |
|
706 if ((rr->length == 0) || (s->rstate == SSL_ST_READ_BODY)) |
|
707 { |
|
708 ret=dtls1_get_record(s); |
|
709 if (ret <= 0) |
|
710 { |
|
711 ret = dtls1_read_failed(s, ret); |
|
712 /* anything other than a timeout is an error */ |
|
713 if (ret <= 0) |
|
714 return(ret); |
|
715 else |
|
716 goto start; |
|
717 } |
|
718 } |
|
719 |
|
720 /* we now have a packet which can be read and processed */ |
|
721 |
|
722 if (s->s3->change_cipher_spec /* set when we receive ChangeCipherSpec, |
|
723 * reset by ssl3_get_finished */ |
|
724 && (rr->type != SSL3_RT_HANDSHAKE)) |
|
725 { |
|
726 al=SSL_AD_UNEXPECTED_MESSAGE; |
|
727 SSLerr(SSL_F_DTLS1_READ_BYTES,SSL_R_DATA_BETWEEN_CCS_AND_FINISHED); |
|
728 goto err; |
|
729 } |
|
730 |
|
731 /* If the other end has shut down, throw anything we read away |
|
732 * (even in 'peek' mode) */ |
|
733 if (s->shutdown & SSL_RECEIVED_SHUTDOWN) |
|
734 { |
|
735 rr->length=0; |
|
736 s->rwstate=SSL_NOTHING; |
|
737 return(0); |
|
738 } |
|
739 |
|
740 |
|
741 if (type == rr->type) /* SSL3_RT_APPLICATION_DATA or SSL3_RT_HANDSHAKE */ |
|
742 { |
|
743 /* make sure that we are not getting application data when we |
|
744 * are doing a handshake for the first time */ |
|
745 if (SSL_in_init(s) && (type == SSL3_RT_APPLICATION_DATA) && |
|
746 (s->enc_read_ctx == NULL)) |
|
747 { |
|
748 al=SSL_AD_UNEXPECTED_MESSAGE; |
|
749 SSLerr(SSL_F_DTLS1_READ_BYTES,SSL_R_APP_DATA_IN_HANDSHAKE); |
|
750 goto f_err; |
|
751 } |
|
752 |
|
753 if (len <= 0) return(len); |
|
754 |
|
755 if ((unsigned int)len > rr->length) |
|
756 n = rr->length; |
|
757 else |
|
758 n = (unsigned int)len; |
|
759 |
|
760 memcpy(buf,&(rr->data[rr->off]),n); |
|
761 if (!peek) |
|
762 { |
|
763 rr->length-=n; |
|
764 rr->off+=n; |
|
765 if (rr->length == 0) |
|
766 { |
|
767 s->rstate=SSL_ST_READ_HEADER; |
|
768 rr->off=0; |
|
769 } |
|
770 } |
|
771 return(n); |
|
772 } |
|
773 |
|
774 |
|
775 /* If we get here, then type != rr->type; if we have a handshake |
|
776 * message, then it was unexpected (Hello Request or Client Hello). */ |
|
777 |
|
778 /* In case of record types for which we have 'fragment' storage, |
|
779 * fill that so that we can process the data at a fixed place. |
|
780 */ |
|
781 { |
|
782 unsigned int k, dest_maxlen = 0; |
|
783 unsigned char *dest = NULL; |
|
784 unsigned int *dest_len = NULL; |
|
785 |
|
786 if (rr->type == SSL3_RT_HANDSHAKE) |
|
787 { |
|
788 dest_maxlen = sizeof s->d1->handshake_fragment; |
|
789 dest = s->d1->handshake_fragment; |
|
790 dest_len = &s->d1->handshake_fragment_len; |
|
791 } |
|
792 else if (rr->type == SSL3_RT_ALERT) |
|
793 { |
|
794 dest_maxlen = sizeof(s->d1->alert_fragment); |
|
795 dest = s->d1->alert_fragment; |
|
796 dest_len = &s->d1->alert_fragment_len; |
|
797 } |
|
798 /* else it's a CCS message, or it's wrong */ |
|
799 else if (rr->type != SSL3_RT_CHANGE_CIPHER_SPEC) |
|
800 { |
|
801 /* Not certain if this is the right error handling */ |
|
802 al=SSL_AD_UNEXPECTED_MESSAGE; |
|
803 SSLerr(SSL_F_DTLS1_READ_BYTES,SSL_R_UNEXPECTED_RECORD); |
|
804 goto f_err; |
|
805 } |
|
806 |
|
807 |
|
808 if (dest_maxlen > 0) |
|
809 { |
|
810 /* XDTLS: In a pathalogical case, the Client Hello |
|
811 * may be fragmented--don't always expect dest_maxlen bytes */ |
|
812 if ( rr->length < dest_maxlen) |
|
813 { |
|
814 s->rstate=SSL_ST_READ_HEADER; |
|
815 rr->length = 0; |
|
816 goto start; |
|
817 } |
|
818 |
|
819 /* now move 'n' bytes: */ |
|
820 for ( k = 0; k < dest_maxlen; k++) |
|
821 { |
|
822 dest[k] = rr->data[rr->off++]; |
|
823 rr->length--; |
|
824 } |
|
825 *dest_len = dest_maxlen; |
|
826 } |
|
827 } |
|
828 |
|
829 /* s->d1->handshake_fragment_len == 12 iff rr->type == SSL3_RT_HANDSHAKE; |
|
830 * s->d1->alert_fragment_len == 7 iff rr->type == SSL3_RT_ALERT. |
|
831 * (Possibly rr is 'empty' now, i.e. rr->length may be 0.) */ |
|
832 |
|
833 /* If we are a client, check for an incoming 'Hello Request': */ |
|
834 if ((!s->server) && |
|
835 (s->d1->handshake_fragment_len >= DTLS1_HM_HEADER_LENGTH) && |
|
836 (s->d1->handshake_fragment[0] == SSL3_MT_HELLO_REQUEST) && |
|
837 (s->session != NULL) && (s->session->cipher != NULL)) |
|
838 { |
|
839 s->d1->handshake_fragment_len = 0; |
|
840 |
|
841 if ((s->d1->handshake_fragment[1] != 0) || |
|
842 (s->d1->handshake_fragment[2] != 0) || |
|
843 (s->d1->handshake_fragment[3] != 0)) |
|
844 { |
|
845 al=SSL_AD_DECODE_ERROR; |
|
846 SSLerr(SSL_F_DTLS1_READ_BYTES,SSL_R_BAD_HELLO_REQUEST); |
|
847 goto err; |
|
848 } |
|
849 |
|
850 /* no need to check sequence number on HELLO REQUEST messages */ |
|
851 |
|
852 if (s->msg_callback) |
|
853 s->msg_callback(0, s->version, SSL3_RT_HANDSHAKE, |
|
854 s->d1->handshake_fragment, 4, s, s->msg_callback_arg); |
|
855 |
|
856 if (SSL_is_init_finished(s) && |
|
857 !(s->s3->flags & SSL3_FLAGS_NO_RENEGOTIATE_CIPHERS) && |
|
858 !s->s3->renegotiate) |
|
859 { |
|
860 ssl3_renegotiate(s); |
|
861 if (ssl3_renegotiate_check(s)) |
|
862 { |
|
863 i=s->handshake_func(s); |
|
864 if (i < 0) return(i); |
|
865 if (i == 0) |
|
866 { |
|
867 SSLerr(SSL_F_DTLS1_READ_BYTES,SSL_R_SSL_HANDSHAKE_FAILURE); |
|
868 return(-1); |
|
869 } |
|
870 |
|
871 if (!(s->mode & SSL_MODE_AUTO_RETRY)) |
|
872 { |
|
873 if (s->s3->rbuf.left == 0) /* no read-ahead left? */ |
|
874 { |
|
875 BIO *bio; |
|
876 /* In the case where we try to read application data, |
|
877 * but we trigger an SSL handshake, we return -1 with |
|
878 * the retry option set. Otherwise renegotiation may |
|
879 * cause nasty problems in the blocking world */ |
|
880 s->rwstate=SSL_READING; |
|
881 bio=SSL_get_rbio(s); |
|
882 BIO_clear_retry_flags(bio); |
|
883 BIO_set_retry_read(bio); |
|
884 return(-1); |
|
885 } |
|
886 } |
|
887 } |
|
888 } |
|
889 /* we either finished a handshake or ignored the request, |
|
890 * now try again to obtain the (application) data we were asked for */ |
|
891 goto start; |
|
892 } |
|
893 |
|
894 if (s->d1->alert_fragment_len >= DTLS1_AL_HEADER_LENGTH) |
|
895 { |
|
896 int alert_level = s->d1->alert_fragment[0]; |
|
897 int alert_descr = s->d1->alert_fragment[1]; |
|
898 |
|
899 s->d1->alert_fragment_len = 0; |
|
900 |
|
901 if (s->msg_callback) |
|
902 s->msg_callback(0, s->version, SSL3_RT_ALERT, |
|
903 s->d1->alert_fragment, 2, s, s->msg_callback_arg); |
|
904 |
|
905 if (s->info_callback != NULL) |
|
906 cb=s->info_callback; |
|
907 else if (s->ctx->info_callback != NULL) |
|
908 cb=s->ctx->info_callback; |
|
909 |
|
910 if (cb != NULL) |
|
911 { |
|
912 j = (alert_level << 8) | alert_descr; |
|
913 cb(s, SSL_CB_READ_ALERT, j); |
|
914 } |
|
915 |
|
916 if (alert_level == 1) /* warning */ |
|
917 { |
|
918 s->s3->warn_alert = alert_descr; |
|
919 if (alert_descr == SSL_AD_CLOSE_NOTIFY) |
|
920 { |
|
921 s->shutdown |= SSL_RECEIVED_SHUTDOWN; |
|
922 return(0); |
|
923 } |
|
924 #if 0 |
|
925 /* XXX: this is a possible improvement in the future */ |
|
926 /* now check if it's a missing record */ |
|
927 if (alert_descr == DTLS1_AD_MISSING_HANDSHAKE_MESSAGE) |
|
928 { |
|
929 unsigned short seq; |
|
930 unsigned int frag_off; |
|
931 unsigned char *p = &(s->d1->alert_fragment[2]); |
|
932 |
|
933 n2s(p, seq); |
|
934 n2l3(p, frag_off); |
|
935 |
|
936 dtls1_retransmit_message(s, seq, frag_off, &found); |
|
937 if ( ! found && SSL_in_init(s)) |
|
938 { |
|
939 /* fprintf( stderr,"in init = %d\n", SSL_in_init(s)); */ |
|
940 /* requested a message not yet sent, |
|
941 send an alert ourselves */ |
|
942 ssl3_send_alert(s,SSL3_AL_WARNING, |
|
943 DTLS1_AD_MISSING_HANDSHAKE_MESSAGE); |
|
944 } |
|
945 } |
|
946 #endif |
|
947 } |
|
948 else if (alert_level == 2) /* fatal */ |
|
949 { |
|
950 char tmp[16]; |
|
951 |
|
952 s->rwstate=SSL_NOTHING; |
|
953 s->s3->fatal_alert = alert_descr; |
|
954 SSLerr(SSL_F_DTLS1_READ_BYTES, SSL_AD_REASON_OFFSET + alert_descr); |
|
955 BIO_snprintf(tmp,sizeof tmp,"%d",alert_descr); |
|
956 ERR_add_error_data(2,"SSL alert number ",tmp); |
|
957 s->shutdown|=SSL_RECEIVED_SHUTDOWN; |
|
958 SSL_CTX_remove_session(s->ctx,s->session); |
|
959 return(0); |
|
960 } |
|
961 else |
|
962 { |
|
963 al=SSL_AD_ILLEGAL_PARAMETER; |
|
964 SSLerr(SSL_F_DTLS1_READ_BYTES,SSL_R_UNKNOWN_ALERT_TYPE); |
|
965 goto f_err; |
|
966 } |
|
967 |
|
968 goto start; |
|
969 } |
|
970 |
|
971 if (s->shutdown & SSL_SENT_SHUTDOWN) /* but we have not received a shutdown */ |
|
972 { |
|
973 s->rwstate=SSL_NOTHING; |
|
974 rr->length=0; |
|
975 return(0); |
|
976 } |
|
977 |
|
978 if (rr->type == SSL3_RT_CHANGE_CIPHER_SPEC) |
|
979 { |
|
980 struct ccs_header_st ccs_hdr; |
|
981 |
|
982 dtls1_get_ccs_header(rr->data, &ccs_hdr); |
|
983 |
|
984 /* 'Change Cipher Spec' is just a single byte, so we know |
|
985 * exactly what the record payload has to look like */ |
|
986 /* XDTLS: check that epoch is consistent */ |
|
987 if ( (s->client_version == DTLS1_BAD_VER && rr->length != 3) || |
|
988 (s->client_version != DTLS1_BAD_VER && rr->length != DTLS1_CCS_HEADER_LENGTH) || |
|
989 (rr->off != 0) || (rr->data[0] != SSL3_MT_CCS)) |
|
990 { |
|
991 i=SSL_AD_ILLEGAL_PARAMETER; |
|
992 SSLerr(SSL_F_DTLS1_READ_BYTES,SSL_R_BAD_CHANGE_CIPHER_SPEC); |
|
993 goto err; |
|
994 } |
|
995 |
|
996 rr->length=0; |
|
997 |
|
998 if (s->msg_callback) |
|
999 s->msg_callback(0, s->version, SSL3_RT_CHANGE_CIPHER_SPEC, |
|
1000 rr->data, 1, s, s->msg_callback_arg); |
|
1001 |
|
1002 s->s3->change_cipher_spec=1; |
|
1003 if (!ssl3_do_change_cipher_spec(s)) |
|
1004 goto err; |
|
1005 |
|
1006 /* do this whenever CCS is processed */ |
|
1007 dtls1_reset_seq_numbers(s, SSL3_CC_READ); |
|
1008 |
|
1009 if (s->client_version == DTLS1_BAD_VER) |
|
1010 s->d1->handshake_read_seq++; |
|
1011 |
|
1012 goto start; |
|
1013 } |
|
1014 |
|
1015 /* Unexpected handshake message (Client Hello, or protocol violation) */ |
|
1016 if ((s->d1->handshake_fragment_len >= DTLS1_HM_HEADER_LENGTH) && |
|
1017 !s->in_handshake) |
|
1018 { |
|
1019 struct hm_header_st msg_hdr; |
|
1020 |
|
1021 /* this may just be a stale retransmit */ |
|
1022 dtls1_get_message_header(rr->data, &msg_hdr); |
|
1023 if( rr->epoch != s->d1->r_epoch) |
|
1024 { |
|
1025 rr->length = 0; |
|
1026 goto start; |
|
1027 } |
|
1028 |
|
1029 if (((s->state&SSL_ST_MASK) == SSL_ST_OK) && |
|
1030 !(s->s3->flags & SSL3_FLAGS_NO_RENEGOTIATE_CIPHERS)) |
|
1031 { |
|
1032 #if 0 /* worked only because C operator preferences are not as expected (and |
|
1033 * because this is not really needed for clients except for detecting |
|
1034 * protocol violations): */ |
|
1035 s->state=SSL_ST_BEFORE|(s->server) |
|
1036 ?SSL_ST_ACCEPT |
|
1037 :SSL_ST_CONNECT; |
|
1038 #else |
|
1039 s->state = s->server ? SSL_ST_ACCEPT : SSL_ST_CONNECT; |
|
1040 #endif |
|
1041 s->new_session=1; |
|
1042 } |
|
1043 i=s->handshake_func(s); |
|
1044 if (i < 0) return(i); |
|
1045 if (i == 0) |
|
1046 { |
|
1047 SSLerr(SSL_F_DTLS1_READ_BYTES,SSL_R_SSL_HANDSHAKE_FAILURE); |
|
1048 return(-1); |
|
1049 } |
|
1050 |
|
1051 if (!(s->mode & SSL_MODE_AUTO_RETRY)) |
|
1052 { |
|
1053 if (s->s3->rbuf.left == 0) /* no read-ahead left? */ |
|
1054 { |
|
1055 BIO *bio; |
|
1056 /* In the case where we try to read application data, |
|
1057 * but we trigger an SSL handshake, we return -1 with |
|
1058 * the retry option set. Otherwise renegotiation may |
|
1059 * cause nasty problems in the blocking world */ |
|
1060 s->rwstate=SSL_READING; |
|
1061 bio=SSL_get_rbio(s); |
|
1062 BIO_clear_retry_flags(bio); |
|
1063 BIO_set_retry_read(bio); |
|
1064 return(-1); |
|
1065 } |
|
1066 } |
|
1067 goto start; |
|
1068 } |
|
1069 |
|
1070 switch (rr->type) |
|
1071 { |
|
1072 default: |
|
1073 #ifndef OPENSSL_NO_TLS |
|
1074 /* TLS just ignores unknown message types */ |
|
1075 if (s->version == TLS1_VERSION) |
|
1076 { |
|
1077 rr->length = 0; |
|
1078 goto start; |
|
1079 } |
|
1080 #endif |
|
1081 al=SSL_AD_UNEXPECTED_MESSAGE; |
|
1082 SSLerr(SSL_F_DTLS1_READ_BYTES,SSL_R_UNEXPECTED_RECORD); |
|
1083 goto f_err; |
|
1084 case SSL3_RT_CHANGE_CIPHER_SPEC: |
|
1085 case SSL3_RT_ALERT: |
|
1086 case SSL3_RT_HANDSHAKE: |
|
1087 /* we already handled all of these, with the possible exception |
|
1088 * of SSL3_RT_HANDSHAKE when s->in_handshake is set, but that |
|
1089 * should not happen when type != rr->type */ |
|
1090 al=SSL_AD_UNEXPECTED_MESSAGE; |
|
1091 SSLerr(SSL_F_DTLS1_READ_BYTES,ERR_R_INTERNAL_ERROR); |
|
1092 goto f_err; |
|
1093 case SSL3_RT_APPLICATION_DATA: |
|
1094 /* At this point, we were expecting handshake data, |
|
1095 * but have application data. If the library was |
|
1096 * running inside ssl3_read() (i.e. in_read_app_data |
|
1097 * is set) and it makes sense to read application data |
|
1098 * at this point (session renegotiation not yet started), |
|
1099 * we will indulge it. |
|
1100 */ |
|
1101 if (s->s3->in_read_app_data && |
|
1102 (s->s3->total_renegotiations != 0) && |
|
1103 (( |
|
1104 (s->state & SSL_ST_CONNECT) && |
|
1105 (s->state >= SSL3_ST_CW_CLNT_HELLO_A) && |
|
1106 (s->state <= SSL3_ST_CR_SRVR_HELLO_A) |
|
1107 ) || ( |
|
1108 (s->state & SSL_ST_ACCEPT) && |
|
1109 (s->state <= SSL3_ST_SW_HELLO_REQ_A) && |
|
1110 (s->state >= SSL3_ST_SR_CLNT_HELLO_A) |
|
1111 ) |
|
1112 )) |
|
1113 { |
|
1114 s->s3->in_read_app_data=2; |
|
1115 return(-1); |
|
1116 } |
|
1117 else |
|
1118 { |
|
1119 al=SSL_AD_UNEXPECTED_MESSAGE; |
|
1120 SSLerr(SSL_F_DTLS1_READ_BYTES,SSL_R_UNEXPECTED_RECORD); |
|
1121 goto f_err; |
|
1122 } |
|
1123 } |
|
1124 /* not reached */ |
|
1125 |
|
1126 f_err: |
|
1127 ssl3_send_alert(s,SSL3_AL_FATAL,al); |
|
1128 err: |
|
1129 return(-1); |
|
1130 } |
|
1131 |
|
1132 int |
|
1133 dtls1_write_app_data_bytes(SSL *s, int type, const void *buf_, int len) |
|
1134 { |
|
1135 unsigned int n,tot; |
|
1136 int i; |
|
1137 |
|
1138 if (SSL_in_init(s) && !s->in_handshake) |
|
1139 { |
|
1140 i=s->handshake_func(s); |
|
1141 if (i < 0) return(i); |
|
1142 if (i == 0) |
|
1143 { |
|
1144 SSLerr(SSL_F_DTLS1_WRITE_APP_DATA_BYTES,SSL_R_SSL_HANDSHAKE_FAILURE); |
|
1145 return -1; |
|
1146 } |
|
1147 } |
|
1148 |
|
1149 tot = s->s3->wnum; |
|
1150 n = len - tot; |
|
1151 |
|
1152 while( n) |
|
1153 { |
|
1154 /* dtls1_write_bytes sends one record at a time, sized according to |
|
1155 * the currently known MTU */ |
|
1156 i = dtls1_write_bytes(s, type, buf_, len); |
|
1157 if (i <= 0) return i; |
|
1158 |
|
1159 if ((i == (int)n) || |
|
1160 (type == SSL3_RT_APPLICATION_DATA && |
|
1161 (s->mode & SSL_MODE_ENABLE_PARTIAL_WRITE))) |
|
1162 { |
|
1163 /* next chunk of data should get another prepended empty fragment |
|
1164 * in ciphersuites with known-IV weakness: */ |
|
1165 s->s3->empty_fragment_done = 0; |
|
1166 return tot+i; |
|
1167 } |
|
1168 |
|
1169 tot += i; |
|
1170 n-=i; |
|
1171 } |
|
1172 |
|
1173 return tot; |
|
1174 } |
|
1175 |
|
1176 |
|
1177 /* this only happens when a client hello is received and a handshake |
|
1178 * is started. */ |
|
1179 static int |
|
1180 have_handshake_fragment(SSL *s, int type, unsigned char *buf, |
|
1181 int len, int peek) |
|
1182 { |
|
1183 |
|
1184 if ((type == SSL3_RT_HANDSHAKE) && (s->d1->handshake_fragment_len > 0)) |
|
1185 /* (partially) satisfy request from storage */ |
|
1186 { |
|
1187 unsigned char *src = s->d1->handshake_fragment; |
|
1188 unsigned char *dst = buf; |
|
1189 unsigned int k,n; |
|
1190 |
|
1191 /* peek == 0 */ |
|
1192 n = 0; |
|
1193 while ((len > 0) && (s->d1->handshake_fragment_len > 0)) |
|
1194 { |
|
1195 *dst++ = *src++; |
|
1196 len--; s->d1->handshake_fragment_len--; |
|
1197 n++; |
|
1198 } |
|
1199 /* move any remaining fragment bytes: */ |
|
1200 for (k = 0; k < s->d1->handshake_fragment_len; k++) |
|
1201 s->d1->handshake_fragment[k] = *src++; |
|
1202 return n; |
|
1203 } |
|
1204 |
|
1205 return 0; |
|
1206 } |
|
1207 |
|
1208 |
|
1209 |
|
1210 |
|
1211 /* Call this to write data in records of type 'type' |
|
1212 * It will return <= 0 if not all data has been sent or non-blocking IO. |
|
1213 */ |
|
1214 int dtls1_write_bytes(SSL *s, int type, const void *buf_, int len) |
|
1215 { |
|
1216 const unsigned char *buf=buf_; |
|
1217 unsigned int tot,n,nw; |
|
1218 int i; |
|
1219 unsigned int mtu; |
|
1220 |
|
1221 s->rwstate=SSL_NOTHING; |
|
1222 tot=s->s3->wnum; |
|
1223 |
|
1224 n=(len-tot); |
|
1225 |
|
1226 /* handshake layer figures out MTU for itself, but data records |
|
1227 * are also sent through this interface, so need to figure out MTU */ |
|
1228 #if 0 |
|
1229 mtu = BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_GET_MTU, 0, NULL); |
|
1230 mtu += DTLS1_HM_HEADER_LENGTH; /* HM already inserted */ |
|
1231 #endif |
|
1232 mtu = s->d1->mtu; |
|
1233 |
|
1234 if (mtu > SSL3_RT_MAX_PLAIN_LENGTH) |
|
1235 mtu = SSL3_RT_MAX_PLAIN_LENGTH; |
|
1236 |
|
1237 if (n > mtu) |
|
1238 nw=mtu; |
|
1239 else |
|
1240 nw=n; |
|
1241 |
|
1242 i=do_dtls1_write(s, type, &(buf[tot]), nw, 0); |
|
1243 if (i <= 0) |
|
1244 { |
|
1245 s->s3->wnum=tot; |
|
1246 return i; |
|
1247 } |
|
1248 |
|
1249 if ( (int)s->s3->wnum + i == len) |
|
1250 s->s3->wnum = 0; |
|
1251 else |
|
1252 s->s3->wnum += i; |
|
1253 |
|
1254 return tot + i; |
|
1255 } |
|
1256 |
|
1257 int do_dtls1_write(SSL *s, int type, const unsigned char *buf, unsigned int len, int create_empty_fragment) |
|
1258 { |
|
1259 unsigned char *p,*pseq; |
|
1260 int i,mac_size,clear=0; |
|
1261 int prefix_len = 0; |
|
1262 SSL3_RECORD *wr; |
|
1263 SSL3_BUFFER *wb; |
|
1264 SSL_SESSION *sess; |
|
1265 int bs; |
|
1266 |
|
1267 /* first check if there is a SSL3_BUFFER still being written |
|
1268 * out. This will happen with non blocking IO */ |
|
1269 if (s->s3->wbuf.left != 0) |
|
1270 { |
|
1271 OPENSSL_assert(0); /* XDTLS: want to see if we ever get here */ |
|
1272 return(ssl3_write_pending(s,type,buf,len)); |
|
1273 } |
|
1274 |
|
1275 /* If we have an alert to send, lets send it */ |
|
1276 if (s->s3->alert_dispatch) |
|
1277 { |
|
1278 i=s->method->ssl_dispatch_alert(s); |
|
1279 if (i <= 0) |
|
1280 return(i); |
|
1281 /* if it went, fall through and send more stuff */ |
|
1282 } |
|
1283 |
|
1284 if (len == 0 && !create_empty_fragment) |
|
1285 return 0; |
|
1286 |
|
1287 wr= &(s->s3->wrec); |
|
1288 wb= &(s->s3->wbuf); |
|
1289 sess=s->session; |
|
1290 |
|
1291 if ( (sess == NULL) || |
|
1292 (s->enc_write_ctx == NULL) || |
|
1293 (s->write_hash == NULL)) |
|
1294 clear=1; |
|
1295 |
|
1296 if (clear) |
|
1297 mac_size=0; |
|
1298 else |
|
1299 mac_size=EVP_MD_size(s->write_hash); |
|
1300 |
|
1301 /* DTLS implements explicit IV, so no need for empty fragments */ |
|
1302 #if 0 |
|
1303 /* 'create_empty_fragment' is true only when this function calls itself */ |
|
1304 if (!clear && !create_empty_fragment && !s->s3->empty_fragment_done |
|
1305 && SSL_version(s) != DTLS1_VERSION) |
|
1306 { |
|
1307 /* countermeasure against known-IV weakness in CBC ciphersuites |
|
1308 * (see http://www.openssl.org/~bodo/tls-cbc.txt) |
|
1309 */ |
|
1310 |
|
1311 if (s->s3->need_empty_fragments && type == SSL3_RT_APPLICATION_DATA) |
|
1312 { |
|
1313 /* recursive function call with 'create_empty_fragment' set; |
|
1314 * this prepares and buffers the data for an empty fragment |
|
1315 * (these 'prefix_len' bytes are sent out later |
|
1316 * together with the actual payload) */ |
|
1317 prefix_len = s->method->do_ssl_write(s, type, buf, 0, 1); |
|
1318 if (prefix_len <= 0) |
|
1319 goto err; |
|
1320 |
|
1321 if (s->s3->wbuf.len < (size_t)prefix_len + SSL3_RT_MAX_PACKET_SIZE) |
|
1322 { |
|
1323 /* insufficient space */ |
|
1324 SSLerr(SSL_F_DO_DTLS1_WRITE, ERR_R_INTERNAL_ERROR); |
|
1325 goto err; |
|
1326 } |
|
1327 } |
|
1328 |
|
1329 s->s3->empty_fragment_done = 1; |
|
1330 } |
|
1331 #endif |
|
1332 |
|
1333 p = wb->buf + prefix_len; |
|
1334 |
|
1335 /* write the header */ |
|
1336 |
|
1337 *(p++)=type&0xff; |
|
1338 wr->type=type; |
|
1339 |
|
1340 if (s->client_version == DTLS1_BAD_VER) |
|
1341 *(p++) = DTLS1_BAD_VER>>8, |
|
1342 *(p++) = DTLS1_BAD_VER&0xff; |
|
1343 else |
|
1344 *(p++)=(s->version>>8), |
|
1345 *(p++)=s->version&0xff; |
|
1346 |
|
1347 /* field where we are to write out packet epoch, seq num and len */ |
|
1348 pseq=p; |
|
1349 p+=10; |
|
1350 |
|
1351 /* lets setup the record stuff. */ |
|
1352 |
|
1353 /* Make space for the explicit IV in case of CBC. |
|
1354 * (this is a bit of a boundary violation, but what the heck). |
|
1355 */ |
|
1356 if ( s->enc_write_ctx && |
|
1357 (EVP_CIPHER_mode( s->enc_write_ctx->cipher ) & EVP_CIPH_CBC_MODE)) |
|
1358 bs = EVP_CIPHER_block_size(s->enc_write_ctx->cipher); |
|
1359 else |
|
1360 bs = 0; |
|
1361 |
|
1362 wr->data=p + bs; /* make room for IV in case of CBC */ |
|
1363 wr->length=(int)len; |
|
1364 wr->input=(unsigned char *)buf; |
|
1365 |
|
1366 /* we now 'read' from wr->input, wr->length bytes into |
|
1367 * wr->data */ |
|
1368 |
|
1369 /* first we compress */ |
|
1370 if (s->compress != NULL) |
|
1371 { |
|
1372 if (!ssl3_do_compress(s)) |
|
1373 { |
|
1374 SSLerr(SSL_F_DO_DTLS1_WRITE,SSL_R_COMPRESSION_FAILURE); |
|
1375 goto err; |
|
1376 } |
|
1377 } |
|
1378 else |
|
1379 { |
|
1380 memcpy(wr->data,wr->input,wr->length); |
|
1381 wr->input=wr->data; |
|
1382 } |
|
1383 |
|
1384 /* we should still have the output to wr->data and the input |
|
1385 * from wr->input. Length should be wr->length. |
|
1386 * wr->data still points in the wb->buf */ |
|
1387 |
|
1388 if (mac_size != 0) |
|
1389 { |
|
1390 s->method->ssl3_enc->mac(s,&(p[wr->length + bs]),1); |
|
1391 wr->length+=mac_size; |
|
1392 } |
|
1393 |
|
1394 /* this is true regardless of mac size */ |
|
1395 wr->input=p; |
|
1396 wr->data=p; |
|
1397 |
|
1398 |
|
1399 /* ssl3_enc can only have an error on read */ |
|
1400 if (bs) /* bs != 0 in case of CBC */ |
|
1401 { |
|
1402 RAND_pseudo_bytes(p,bs); |
|
1403 /* master IV and last CBC residue stand for |
|
1404 * the rest of randomness */ |
|
1405 wr->length += bs; |
|
1406 } |
|
1407 |
|
1408 s->method->ssl3_enc->enc(s,1); |
|
1409 |
|
1410 /* record length after mac and block padding */ |
|
1411 /* if (type == SSL3_RT_APPLICATION_DATA || |
|
1412 (type == SSL3_RT_ALERT && ! SSL_in_init(s))) */ |
|
1413 |
|
1414 /* there's only one epoch between handshake and app data */ |
|
1415 |
|
1416 s2n(s->d1->w_epoch, pseq); |
|
1417 |
|
1418 /* XDTLS: ?? */ |
|
1419 /* else |
|
1420 s2n(s->d1->handshake_epoch, pseq); */ |
|
1421 |
|
1422 memcpy(pseq, &(s->s3->write_sequence[2]), 6); |
|
1423 pseq+=6; |
|
1424 s2n(wr->length,pseq); |
|
1425 |
|
1426 /* we should now have |
|
1427 * wr->data pointing to the encrypted data, which is |
|
1428 * wr->length long */ |
|
1429 wr->type=type; /* not needed but helps for debugging */ |
|
1430 wr->length+=DTLS1_RT_HEADER_LENGTH; |
|
1431 |
|
1432 #if 0 /* this is now done at the message layer */ |
|
1433 /* buffer the record, making it easy to handle retransmits */ |
|
1434 if ( type == SSL3_RT_HANDSHAKE || type == SSL3_RT_CHANGE_CIPHER_SPEC) |
|
1435 dtls1_buffer_record(s, wr->data, wr->length, |
|
1436 *((PQ_64BIT *)&(s->s3->write_sequence[0]))); |
|
1437 #endif |
|
1438 |
|
1439 ssl3_record_sequence_update(&(s->s3->write_sequence[0])); |
|
1440 |
|
1441 if (create_empty_fragment) |
|
1442 { |
|
1443 /* we are in a recursive call; |
|
1444 * just return the length, don't write out anything here |
|
1445 */ |
|
1446 return wr->length; |
|
1447 } |
|
1448 |
|
1449 /* now let's set up wb */ |
|
1450 wb->left = prefix_len + wr->length; |
|
1451 wb->offset = 0; |
|
1452 |
|
1453 /* memorize arguments so that ssl3_write_pending can detect bad write retries later */ |
|
1454 s->s3->wpend_tot=len; |
|
1455 s->s3->wpend_buf=buf; |
|
1456 s->s3->wpend_type=type; |
|
1457 s->s3->wpend_ret=len; |
|
1458 |
|
1459 /* we now just need to write the buffer */ |
|
1460 return ssl3_write_pending(s,type,buf,len); |
|
1461 err: |
|
1462 return -1; |
|
1463 } |
|
1464 |
|
1465 |
|
1466 |
|
1467 static int dtls1_record_replay_check(SSL *s, DTLS1_BITMAP *bitmap, |
|
1468 PQ_64BIT *seq_num) |
|
1469 { |
|
1470 #if PQ_64BIT_IS_INTEGER |
|
1471 PQ_64BIT mask = 0x0000000000000001L; |
|
1472 #endif |
|
1473 PQ_64BIT rcd_num, tmp; |
|
1474 |
|
1475 pq_64bit_init(&rcd_num); |
|
1476 pq_64bit_init(&tmp); |
|
1477 |
|
1478 /* this is the sequence number for the record just read */ |
|
1479 pq_64bit_bin2num(&rcd_num, s->s3->read_sequence, 8); |
|
1480 |
|
1481 |
|
1482 if (pq_64bit_gt(&rcd_num, &(bitmap->max_seq_num)) || |
|
1483 pq_64bit_eq(&rcd_num, &(bitmap->max_seq_num))) |
|
1484 { |
|
1485 pq_64bit_assign(seq_num, &rcd_num); |
|
1486 pq_64bit_free(&rcd_num); |
|
1487 pq_64bit_free(&tmp); |
|
1488 return 1; /* this record is new */ |
|
1489 } |
|
1490 |
|
1491 pq_64bit_sub(&tmp, &(bitmap->max_seq_num), &rcd_num); |
|
1492 |
|
1493 if ( pq_64bit_get_word(&tmp) > bitmap->length) |
|
1494 { |
|
1495 pq_64bit_free(&rcd_num); |
|
1496 pq_64bit_free(&tmp); |
|
1497 return 0; /* stale, outside the window */ |
|
1498 } |
|
1499 |
|
1500 #if PQ_64BIT_IS_BIGNUM |
|
1501 { |
|
1502 int offset; |
|
1503 pq_64bit_sub(&tmp, &(bitmap->max_seq_num), &rcd_num); |
|
1504 pq_64bit_sub_word(&tmp, 1); |
|
1505 offset = pq_64bit_get_word(&tmp); |
|
1506 if ( pq_64bit_is_bit_set(&(bitmap->map), offset)) |
|
1507 { |
|
1508 pq_64bit_free(&rcd_num); |
|
1509 pq_64bit_free(&tmp); |
|
1510 return 0; |
|
1511 } |
|
1512 } |
|
1513 #else |
|
1514 mask <<= (bitmap->max_seq_num - rcd_num - 1); |
|
1515 if (bitmap->map & mask) |
|
1516 return 0; /* record previously received */ |
|
1517 #endif |
|
1518 |
|
1519 pq_64bit_assign(seq_num, &rcd_num); |
|
1520 pq_64bit_free(&rcd_num); |
|
1521 pq_64bit_free(&tmp); |
|
1522 return 1; |
|
1523 } |
|
1524 |
|
1525 |
|
1526 static void dtls1_record_bitmap_update(SSL *s, DTLS1_BITMAP *bitmap) |
|
1527 { |
|
1528 unsigned int shift; |
|
1529 PQ_64BIT rcd_num; |
|
1530 PQ_64BIT tmp; |
|
1531 PQ_64BIT_CTX *ctx; |
|
1532 |
|
1533 pq_64bit_init(&rcd_num); |
|
1534 pq_64bit_init(&tmp); |
|
1535 |
|
1536 pq_64bit_bin2num(&rcd_num, s->s3->read_sequence, 8); |
|
1537 |
|
1538 /* unfortunate code complexity due to 64-bit manipulation support |
|
1539 * on 32-bit machines */ |
|
1540 if ( pq_64bit_gt(&rcd_num, &(bitmap->max_seq_num)) || |
|
1541 pq_64bit_eq(&rcd_num, &(bitmap->max_seq_num))) |
|
1542 { |
|
1543 pq_64bit_sub(&tmp, &rcd_num, &(bitmap->max_seq_num)); |
|
1544 pq_64bit_add_word(&tmp, 1); |
|
1545 |
|
1546 shift = (unsigned int)pq_64bit_get_word(&tmp); |
|
1547 |
|
1548 pq_64bit_lshift(&(tmp), &(bitmap->map), shift); |
|
1549 pq_64bit_assign(&(bitmap->map), &tmp); |
|
1550 |
|
1551 pq_64bit_set_bit(&(bitmap->map), 0); |
|
1552 pq_64bit_add_word(&rcd_num, 1); |
|
1553 pq_64bit_assign(&(bitmap->max_seq_num), &rcd_num); |
|
1554 |
|
1555 pq_64bit_assign_word(&tmp, 1); |
|
1556 pq_64bit_lshift(&tmp, &tmp, bitmap->length); |
|
1557 ctx = pq_64bit_ctx_new(&ctx); |
|
1558 pq_64bit_mod(&(bitmap->map), &(bitmap->map), &tmp, ctx); |
|
1559 pq_64bit_ctx_free(ctx); |
|
1560 } |
|
1561 else |
|
1562 { |
|
1563 pq_64bit_sub(&tmp, &(bitmap->max_seq_num), &rcd_num); |
|
1564 pq_64bit_sub_word(&tmp, 1); |
|
1565 shift = (unsigned int)pq_64bit_get_word(&tmp); |
|
1566 |
|
1567 pq_64bit_set_bit(&(bitmap->map), shift); |
|
1568 } |
|
1569 |
|
1570 pq_64bit_free(&rcd_num); |
|
1571 pq_64bit_free(&tmp); |
|
1572 } |
|
1573 |
|
1574 |
|
1575 int dtls1_dispatch_alert(SSL *s) |
|
1576 { |
|
1577 int i,j; |
|
1578 void (*cb)(const SSL *ssl,int type,int val)=NULL; |
|
1579 unsigned char buf[2 + 2 + 3]; /* alert level + alert desc + message seq +frag_off */ |
|
1580 unsigned char *ptr = &buf[0]; |
|
1581 |
|
1582 s->s3->alert_dispatch=0; |
|
1583 |
|
1584 memset(buf, 0x00, sizeof(buf)); |
|
1585 *ptr++ = s->s3->send_alert[0]; |
|
1586 *ptr++ = s->s3->send_alert[1]; |
|
1587 |
|
1588 if (s->s3->send_alert[1] == DTLS1_AD_MISSING_HANDSHAKE_MESSAGE) |
|
1589 { |
|
1590 s2n(s->d1->handshake_read_seq, ptr); |
|
1591 #if 0 |
|
1592 if ( s->d1->r_msg_hdr.frag_off == 0) /* waiting for a new msg */ |
|
1593 |
|
1594 else |
|
1595 s2n(s->d1->r_msg_hdr.seq, ptr); /* partial msg read */ |
|
1596 #endif |
|
1597 |
|
1598 #if 0 |
|
1599 fprintf(stderr, "s->d1->handshake_read_seq = %d, s->d1->r_msg_hdr.seq = %d\n",s->d1->handshake_read_seq,s->d1->r_msg_hdr.seq); |
|
1600 #endif |
|
1601 l2n3(s->d1->r_msg_hdr.frag_off, ptr); |
|
1602 } |
|
1603 |
|
1604 i = do_dtls1_write(s, SSL3_RT_ALERT, &buf[0], sizeof(buf), 0); |
|
1605 if (i <= 0) |
|
1606 { |
|
1607 s->s3->alert_dispatch=1; |
|
1608 /* fprintf( stderr, "not done with alert\n" ); */ |
|
1609 } |
|
1610 else |
|
1611 { |
|
1612 if ( s->s3->send_alert[0] == SSL3_AL_FATAL || |
|
1613 s->s3->send_alert[1] == DTLS1_AD_MISSING_HANDSHAKE_MESSAGE) |
|
1614 (void)BIO_flush(s->wbio); |
|
1615 |
|
1616 if (s->msg_callback) |
|
1617 s->msg_callback(1, s->version, SSL3_RT_ALERT, s->s3->send_alert, |
|
1618 2, s, s->msg_callback_arg); |
|
1619 |
|
1620 if (s->info_callback != NULL) |
|
1621 cb=s->info_callback; |
|
1622 else if (s->ctx->info_callback != NULL) |
|
1623 cb=s->ctx->info_callback; |
|
1624 |
|
1625 if (cb != NULL) |
|
1626 { |
|
1627 j=(s->s3->send_alert[0]<<8)|s->s3->send_alert[1]; |
|
1628 cb(s,SSL_CB_WRITE_ALERT,j); |
|
1629 } |
|
1630 } |
|
1631 return(i); |
|
1632 } |
|
1633 |
|
1634 |
|
1635 static DTLS1_BITMAP * |
|
1636 dtls1_get_bitmap(SSL *s, SSL3_RECORD *rr, unsigned int *is_next_epoch) |
|
1637 { |
|
1638 |
|
1639 *is_next_epoch = 0; |
|
1640 |
|
1641 /* In current epoch, accept HM, CCS, DATA, & ALERT */ |
|
1642 if (rr->epoch == s->d1->r_epoch) |
|
1643 return &s->d1->bitmap; |
|
1644 |
|
1645 /* Only HM and ALERT messages can be from the next epoch */ |
|
1646 else if (rr->epoch == (unsigned long)(s->d1->r_epoch + 1) && |
|
1647 (rr->type == SSL3_RT_HANDSHAKE || |
|
1648 rr->type == SSL3_RT_ALERT)) |
|
1649 { |
|
1650 *is_next_epoch = 1; |
|
1651 return &s->d1->next_bitmap; |
|
1652 } |
|
1653 |
|
1654 return NULL; |
|
1655 } |
|
1656 |
|
1657 #if 0 |
|
1658 static int |
|
1659 dtls1_record_needs_buffering(SSL *s, SSL3_RECORD *rr, unsigned short *priority, |
|
1660 unsigned long *offset) |
|
1661 { |
|
1662 |
|
1663 /* alerts are passed up immediately */ |
|
1664 if ( rr->type == SSL3_RT_APPLICATION_DATA || |
|
1665 rr->type == SSL3_RT_ALERT) |
|
1666 return 0; |
|
1667 |
|
1668 /* Only need to buffer if a handshake is underway. |
|
1669 * (this implies that Hello Request and Client Hello are passed up |
|
1670 * immediately) */ |
|
1671 if ( SSL_in_init(s)) |
|
1672 { |
|
1673 unsigned char *data = rr->data; |
|
1674 /* need to extract the HM/CCS sequence number here */ |
|
1675 if ( rr->type == SSL3_RT_HANDSHAKE || |
|
1676 rr->type == SSL3_RT_CHANGE_CIPHER_SPEC) |
|
1677 { |
|
1678 unsigned short seq_num; |
|
1679 struct hm_header_st msg_hdr; |
|
1680 struct ccs_header_st ccs_hdr; |
|
1681 |
|
1682 if ( rr->type == SSL3_RT_HANDSHAKE) |
|
1683 { |
|
1684 dtls1_get_message_header(data, &msg_hdr); |
|
1685 seq_num = msg_hdr.seq; |
|
1686 *offset = msg_hdr.frag_off; |
|
1687 } |
|
1688 else |
|
1689 { |
|
1690 dtls1_get_ccs_header(data, &ccs_hdr); |
|
1691 seq_num = ccs_hdr.seq; |
|
1692 *offset = 0; |
|
1693 } |
|
1694 |
|
1695 /* this is either a record we're waiting for, or a |
|
1696 * retransmit of something we happened to previously |
|
1697 * receive (higher layers will drop the repeat silently */ |
|
1698 if ( seq_num < s->d1->handshake_read_seq) |
|
1699 return 0; |
|
1700 if (rr->type == SSL3_RT_HANDSHAKE && |
|
1701 seq_num == s->d1->handshake_read_seq && |
|
1702 msg_hdr.frag_off < s->d1->r_msg_hdr.frag_off) |
|
1703 return 0; |
|
1704 else if ( seq_num == s->d1->handshake_read_seq && |
|
1705 (rr->type == SSL3_RT_CHANGE_CIPHER_SPEC || |
|
1706 msg_hdr.frag_off == s->d1->r_msg_hdr.frag_off)) |
|
1707 return 0; |
|
1708 else |
|
1709 { |
|
1710 *priority = seq_num; |
|
1711 return 1; |
|
1712 } |
|
1713 } |
|
1714 else /* unknown record type */ |
|
1715 return 0; |
|
1716 } |
|
1717 |
|
1718 return 0; |
|
1719 } |
|
1720 #endif |
|
1721 |
|
1722 void |
|
1723 dtls1_reset_seq_numbers(SSL *s, int rw) |
|
1724 { |
|
1725 unsigned char *seq; |
|
1726 unsigned int seq_bytes = sizeof(s->s3->read_sequence); |
|
1727 |
|
1728 if ( rw & SSL3_CC_READ) |
|
1729 { |
|
1730 seq = s->s3->read_sequence; |
|
1731 s->d1->r_epoch++; |
|
1732 |
|
1733 pq_64bit_assign(&(s->d1->bitmap.map), &(s->d1->next_bitmap.map)); |
|
1734 s->d1->bitmap.length = s->d1->next_bitmap.length; |
|
1735 pq_64bit_assign(&(s->d1->bitmap.max_seq_num), |
|
1736 &(s->d1->next_bitmap.max_seq_num)); |
|
1737 |
|
1738 pq_64bit_free(&(s->d1->next_bitmap.map)); |
|
1739 pq_64bit_free(&(s->d1->next_bitmap.max_seq_num)); |
|
1740 memset(&(s->d1->next_bitmap), 0x00, sizeof(DTLS1_BITMAP)); |
|
1741 pq_64bit_init(&(s->d1->next_bitmap.map)); |
|
1742 pq_64bit_init(&(s->d1->next_bitmap.max_seq_num)); |
|
1743 } |
|
1744 else |
|
1745 { |
|
1746 seq = s->s3->write_sequence; |
|
1747 s->d1->w_epoch++; |
|
1748 } |
|
1749 |
|
1750 memset(seq, 0x00, seq_bytes); |
|
1751 } |
|
1752 |
|
1753 #if PQ_64BIT_IS_INTEGER |
|
1754 static PQ_64BIT |
|
1755 bytes_to_long_long(unsigned char *bytes, PQ_64BIT *num) |
|
1756 { |
|
1757 PQ_64BIT _num; |
|
1758 |
|
1759 _num = (((PQ_64BIT)bytes[0]) << 56) | |
|
1760 (((PQ_64BIT)bytes[1]) << 48) | |
|
1761 (((PQ_64BIT)bytes[2]) << 40) | |
|
1762 (((PQ_64BIT)bytes[3]) << 32) | |
|
1763 (((PQ_64BIT)bytes[4]) << 24) | |
|
1764 (((PQ_64BIT)bytes[5]) << 16) | |
|
1765 (((PQ_64BIT)bytes[6]) << 8) | |
|
1766 (((PQ_64BIT)bytes[7]) ); |
|
1767 |
|
1768 *num = _num ; |
|
1769 return _num; |
|
1770 } |
|
1771 #endif |
|
1772 |
|
1773 |
|
1774 static void |
|
1775 dtls1_clear_timeouts(SSL *s) |
|
1776 { |
|
1777 memset(&(s->d1->timeout), 0x00, sizeof(struct dtls1_timeout_st)); |
|
1778 } |