1 | /*
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2 | * Copyright 2005-2016 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 <errno.h>
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12 | #define USE_SOCKETS
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13 | #include "../ssl_locl.h"
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14 | #include <openssl/evp.h>
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15 | #include <openssl/buffer.h>
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16 | #include "record_locl.h"
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17 |
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18 | int DTLS_RECORD_LAYER_new(RECORD_LAYER *rl)
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19 | {
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20 | DTLS_RECORD_LAYER *d;
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21 |
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22 | if ((d = OPENSSL_malloc(sizeof(*d))) == NULL)
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23 | return (0);
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24 |
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25 | rl->d = d;
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26 |
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27 | d->unprocessed_rcds.q = pqueue_new();
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28 | d->processed_rcds.q = pqueue_new();
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29 | d->buffered_app_data.q = pqueue_new();
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30 |
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31 | if (d->unprocessed_rcds.q == NULL || d->processed_rcds.q == NULL
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32 | || d->buffered_app_data.q == NULL) {
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33 | pqueue_free(d->unprocessed_rcds.q);
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34 | pqueue_free(d->processed_rcds.q);
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35 | pqueue_free(d->buffered_app_data.q);
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36 | OPENSSL_free(d);
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37 | rl->d = NULL;
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38 | return (0);
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39 | }
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40 |
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41 | return 1;
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42 | }
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43 |
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44 | void DTLS_RECORD_LAYER_free(RECORD_LAYER *rl)
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45 | {
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46 | DTLS_RECORD_LAYER_clear(rl);
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47 | pqueue_free(rl->d->unprocessed_rcds.q);
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48 | pqueue_free(rl->d->processed_rcds.q);
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49 | pqueue_free(rl->d->buffered_app_data.q);
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50 | OPENSSL_free(rl->d);
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51 | rl->d = NULL;
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52 | }
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53 |
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54 | void DTLS_RECORD_LAYER_clear(RECORD_LAYER *rl)
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55 | {
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56 | DTLS_RECORD_LAYER *d;
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57 | pitem *item = NULL;
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58 | DTLS1_RECORD_DATA *rdata;
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59 | pqueue *unprocessed_rcds;
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60 | pqueue *processed_rcds;
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61 | pqueue *buffered_app_data;
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62 |
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63 | d = rl->d;
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64 |
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65 | while ((item = pqueue_pop(d->unprocessed_rcds.q)) != NULL) {
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66 | rdata = (DTLS1_RECORD_DATA *)item->data;
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67 | OPENSSL_free(rdata->rbuf.buf);
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68 | OPENSSL_free(item->data);
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69 | pitem_free(item);
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70 | }
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71 |
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72 | while ((item = pqueue_pop(d->processed_rcds.q)) != NULL) {
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73 | rdata = (DTLS1_RECORD_DATA *)item->data;
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74 | OPENSSL_free(rdata->rbuf.buf);
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75 | OPENSSL_free(item->data);
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76 | pitem_free(item);
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77 | }
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78 |
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79 | while ((item = pqueue_pop(d->buffered_app_data.q)) != NULL) {
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80 | rdata = (DTLS1_RECORD_DATA *)item->data;
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81 | OPENSSL_free(rdata->rbuf.buf);
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82 | OPENSSL_free(item->data);
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83 | pitem_free(item);
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84 | }
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85 |
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86 | unprocessed_rcds = d->unprocessed_rcds.q;
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87 | processed_rcds = d->processed_rcds.q;
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88 | buffered_app_data = d->buffered_app_data.q;
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89 | memset(d, 0, sizeof(*d));
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90 | d->unprocessed_rcds.q = unprocessed_rcds;
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91 | d->processed_rcds.q = processed_rcds;
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92 | d->buffered_app_data.q = buffered_app_data;
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93 | }
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94 |
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95 | void DTLS_RECORD_LAYER_set_saved_w_epoch(RECORD_LAYER *rl, unsigned short e)
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96 | {
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97 | if (e == rl->d->w_epoch - 1) {
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98 | memcpy(rl->d->curr_write_sequence,
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99 | rl->write_sequence, sizeof(rl->write_sequence));
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100 | memcpy(rl->write_sequence,
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101 | rl->d->last_write_sequence, sizeof(rl->write_sequence));
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102 | } else if (e == rl->d->w_epoch + 1) {
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103 | memcpy(rl->d->last_write_sequence,
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104 | rl->write_sequence, sizeof(unsigned char[8]));
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105 | memcpy(rl->write_sequence,
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106 | rl->d->curr_write_sequence, sizeof(rl->write_sequence));
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107 | }
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108 | rl->d->w_epoch = e;
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109 | }
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110 |
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111 | void DTLS_RECORD_LAYER_resync_write(RECORD_LAYER *rl)
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112 | {
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113 | memcpy(rl->write_sequence, rl->read_sequence, sizeof(rl->write_sequence));
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114 | }
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115 |
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116 | void DTLS_RECORD_LAYER_set_write_sequence(RECORD_LAYER *rl, unsigned char *seq)
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117 | {
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118 | memcpy(rl->write_sequence, seq, SEQ_NUM_SIZE);
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119 | }
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120 |
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121 | static int have_handshake_fragment(SSL *s, int type, unsigned char *buf,
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122 | int len);
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123 |
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124 | /* copy buffered record into SSL structure */
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125 | static int dtls1_copy_record(SSL *s, pitem *item)
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126 | {
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127 | DTLS1_RECORD_DATA *rdata;
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128 |
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129 | rdata = (DTLS1_RECORD_DATA *)item->data;
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130 |
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131 | SSL3_BUFFER_release(&s->rlayer.rbuf);
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132 |
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133 | s->rlayer.packet = rdata->packet;
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134 | s->rlayer.packet_length = rdata->packet_length;
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135 | memcpy(&s->rlayer.rbuf, &(rdata->rbuf), sizeof(SSL3_BUFFER));
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136 | memcpy(&s->rlayer.rrec, &(rdata->rrec), sizeof(SSL3_RECORD));
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137 |
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138 | /* Set proper sequence number for mac calculation */
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139 | memcpy(&(s->rlayer.read_sequence[2]), &(rdata->packet[5]), 6);
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140 |
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141 | return (1);
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142 | }
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143 |
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144 | int dtls1_buffer_record(SSL *s, record_pqueue *queue, unsigned char *priority)
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145 | {
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146 | DTLS1_RECORD_DATA *rdata;
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147 | pitem *item;
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148 |
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149 | /* Limit the size of the queue to prevent DOS attacks */
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150 | if (pqueue_size(queue->q) >= 100)
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151 | return 0;
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152 |
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153 | rdata = OPENSSL_malloc(sizeof(*rdata));
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154 | item = pitem_new(priority, rdata);
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155 | if (rdata == NULL || item == NULL) {
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156 | OPENSSL_free(rdata);
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157 | pitem_free(item);
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158 | SSLerr(SSL_F_DTLS1_BUFFER_RECORD, ERR_R_INTERNAL_ERROR);
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159 | return -1;
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160 | }
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161 |
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162 | rdata->packet = s->rlayer.packet;
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163 | rdata->packet_length = s->rlayer.packet_length;
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164 | memcpy(&(rdata->rbuf), &s->rlayer.rbuf, sizeof(SSL3_BUFFER));
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165 | memcpy(&(rdata->rrec), &s->rlayer.rrec, sizeof(SSL3_RECORD));
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166 |
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167 | item->data = rdata;
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168 |
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169 | #ifndef OPENSSL_NO_SCTP
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170 | /* Store bio_dgram_sctp_rcvinfo struct */
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171 | if (BIO_dgram_is_sctp(SSL_get_rbio(s)) &&
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172 | (SSL_get_state(s) == TLS_ST_SR_FINISHED
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173 | || SSL_get_state(s) == TLS_ST_CR_FINISHED)) {
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174 | BIO_ctrl(SSL_get_rbio(s), BIO_CTRL_DGRAM_SCTP_GET_RCVINFO,
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175 | sizeof(rdata->recordinfo), &rdata->recordinfo);
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176 | }
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177 | #endif
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178 |
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179 | s->rlayer.packet = NULL;
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180 | s->rlayer.packet_length = 0;
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181 | memset(&s->rlayer.rbuf, 0, sizeof(s->rlayer.rbuf));
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182 | memset(&s->rlayer.rrec, 0, sizeof(s->rlayer.rrec));
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183 |
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184 | if (!ssl3_setup_buffers(s)) {
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185 | SSLerr(SSL_F_DTLS1_BUFFER_RECORD, ERR_R_INTERNAL_ERROR);
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186 | OPENSSL_free(rdata->rbuf.buf);
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187 | OPENSSL_free(rdata);
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188 | pitem_free(item);
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189 | return (-1);
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190 | }
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191 |
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192 | /* insert should not fail, since duplicates are dropped */
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193 | if (pqueue_insert(queue->q, item) == NULL) {
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194 | SSLerr(SSL_F_DTLS1_BUFFER_RECORD, ERR_R_INTERNAL_ERROR);
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195 | OPENSSL_free(rdata->rbuf.buf);
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196 | OPENSSL_free(rdata);
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197 | pitem_free(item);
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198 | return (-1);
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199 | }
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200 |
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201 | return (1);
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202 | }
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203 |
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204 | int dtls1_retrieve_buffered_record(SSL *s, record_pqueue *queue)
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205 | {
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206 | pitem *item;
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207 |
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208 | item = pqueue_pop(queue->q);
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209 | if (item) {
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210 | dtls1_copy_record(s, item);
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211 |
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212 | OPENSSL_free(item->data);
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213 | pitem_free(item);
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214 |
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215 | return (1);
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216 | }
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217 |
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218 | return (0);
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219 | }
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220 |
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221 | /*
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222 | * retrieve a buffered record that belongs to the new epoch, i.e., not
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223 | * processed yet
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224 | */
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225 | #define dtls1_get_unprocessed_record(s) \
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226 | dtls1_retrieve_buffered_record((s), \
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227 | &((s)->rlayer.d->unprocessed_rcds))
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228 |
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229 | int dtls1_process_buffered_records(SSL *s)
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230 | {
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231 | pitem *item;
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232 | SSL3_BUFFER *rb;
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233 | SSL3_RECORD *rr;
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234 | DTLS1_BITMAP *bitmap;
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235 | unsigned int is_next_epoch;
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236 | int replayok = 1;
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237 |
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238 | item = pqueue_peek(s->rlayer.d->unprocessed_rcds.q);
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239 | if (item) {
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240 | /* Check if epoch is current. */
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241 | if (s->rlayer.d->unprocessed_rcds.epoch != s->rlayer.d->r_epoch)
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242 | return 1; /* Nothing to do. */
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243 |
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244 | rr = RECORD_LAYER_get_rrec(&s->rlayer);
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245 |
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246 | rb = RECORD_LAYER_get_rbuf(&s->rlayer);
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247 |
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248 | if (SSL3_BUFFER_get_left(rb) > 0) {
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249 | /*
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250 | * We've still got data from the current packet to read. There could
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251 | * be a record from the new epoch in it - so don't overwrite it
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252 | * with the unprocessed records yet (we'll do it when we've
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253 | * finished reading the current packet).
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254 | */
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255 | return 1;
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256 | }
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257 |
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258 | /* Process all the records. */
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259 | while (pqueue_peek(s->rlayer.d->unprocessed_rcds.q)) {
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260 | dtls1_get_unprocessed_record(s);
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261 | bitmap = dtls1_get_bitmap(s, rr, &is_next_epoch);
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262 | if (bitmap == NULL) {
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263 | /*
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264 | * Should not happen. This will only ever be NULL when the
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265 | * current record is from a different epoch. But that cannot
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266 | * be the case because we already checked the epoch above
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267 | */
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268 | SSLerr(SSL_F_DTLS1_PROCESS_BUFFERED_RECORDS,
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269 | ERR_R_INTERNAL_ERROR);
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270 | return 0;
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271 | }
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272 | #ifndef OPENSSL_NO_SCTP
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273 | /* Only do replay check if no SCTP bio */
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274 | if (!BIO_dgram_is_sctp(SSL_get_rbio(s)))
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275 | #endif
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276 | {
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277 | /*
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278 | * Check whether this is a repeat, or aged record. We did this
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279 | * check once already when we first received the record - but
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280 | * we might have updated the window since then due to
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281 | * records we subsequently processed.
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282 | */
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283 | replayok = dtls1_record_replay_check(s, bitmap);
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284 | }
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285 |
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286 | if (!replayok || !dtls1_process_record(s, bitmap)) {
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287 | /* dump this record */
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288 | rr->length = 0;
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289 | RECORD_LAYER_reset_packet_length(&s->rlayer);
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290 | continue;
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291 | }
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292 |
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293 | if (dtls1_buffer_record(s, &(s->rlayer.d->processed_rcds),
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294 | SSL3_RECORD_get_seq_num(s->rlayer.rrec)) < 0)
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295 | return 0;
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296 | }
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297 | }
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298 |
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299 | /*
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300 | * sync epoch numbers once all the unprocessed records have been
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301 | * processed
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302 | */
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303 | s->rlayer.d->processed_rcds.epoch = s->rlayer.d->r_epoch;
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304 | s->rlayer.d->unprocessed_rcds.epoch = s->rlayer.d->r_epoch + 1;
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305 |
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306 | return 1;
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307 | }
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308 |
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309 | /*-
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310 | * Return up to 'len' payload bytes received in 'type' records.
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311 | * 'type' is one of the following:
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312 | *
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313 | * - SSL3_RT_HANDSHAKE (when ssl3_get_message calls us)
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314 | * - SSL3_RT_APPLICATION_DATA (when ssl3_read calls us)
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315 | * - 0 (during a shutdown, no data has to be returned)
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316 | *
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317 | * If we don't have stored data to work from, read a SSL/TLS record first
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318 | * (possibly multiple records if we still don't have anything to return).
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319 | *
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320 | * This function must handle any surprises the peer may have for us, such as
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321 | * Alert records (e.g. close_notify) or renegotiation requests. ChangeCipherSpec
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322 | * messages are treated as if they were handshake messages *if* the |recd_type|
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323 | * argument is non NULL.
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324 | * Also if record payloads contain fragments too small to process, we store
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325 | * them until there is enough for the respective protocol (the record protocol
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326 | * may use arbitrary fragmentation and even interleaving):
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327 | * Change cipher spec protocol
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328 | * just 1 byte needed, no need for keeping anything stored
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329 | * Alert protocol
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330 | * 2 bytes needed (AlertLevel, AlertDescription)
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331 | * Handshake protocol
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332 | * 4 bytes needed (HandshakeType, uint24 length) -- we just have
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333 | * to detect unexpected Client Hello and Hello Request messages
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334 | * here, anything else is handled by higher layers
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335 | * Application data protocol
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336 | * none of our business
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337 | */
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338 | int dtls1_read_bytes(SSL *s, int type, int *recvd_type, unsigned char *buf,
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339 | int len, int peek)
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340 | {
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341 | int al, i, j, ret;
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342 | unsigned int n;
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343 | SSL3_RECORD *rr;
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344 | void (*cb) (const SSL *ssl, int type2, int val) = NULL;
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345 |
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346 | if (!SSL3_BUFFER_is_initialised(&s->rlayer.rbuf)) {
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347 | /* Not initialized yet */
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348 | if (!ssl3_setup_buffers(s))
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349 | return (-1);
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350 | }
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351 |
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352 | if ((type && (type != SSL3_RT_APPLICATION_DATA) &&
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353 | (type != SSL3_RT_HANDSHAKE)) ||
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354 | (peek && (type != SSL3_RT_APPLICATION_DATA))) {
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355 | SSLerr(SSL_F_DTLS1_READ_BYTES, ERR_R_INTERNAL_ERROR);
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356 | return -1;
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357 | }
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358 |
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359 | /*
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360 | * check whether there's a handshake message (client hello?) waiting
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361 | */
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362 | if ((ret = have_handshake_fragment(s, type, buf, len))) {
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363 | *recvd_type = SSL3_RT_HANDSHAKE;
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364 | return ret;
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365 | }
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366 |
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367 | /*
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368 | * Now s->rlayer.d->handshake_fragment_len == 0 if
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369 | * type == SSL3_RT_HANDSHAKE.
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370 | */
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371 |
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372 | #ifndef OPENSSL_NO_SCTP
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373 | /*
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374 | * Continue handshake if it had to be interrupted to read app data with
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375 | * SCTP.
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376 | */
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377 | if ((!ossl_statem_get_in_handshake(s) && SSL_in_init(s)) ||
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378 | (BIO_dgram_is_sctp(SSL_get_rbio(s))
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379 | && ossl_statem_in_sctp_read_sock(s)
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380 | && s->s3->in_read_app_data != 2))
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381 | #else
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382 | if (!ossl_statem_get_in_handshake(s) && SSL_in_init(s))
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383 | #endif
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384 | {
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385 | /* type == SSL3_RT_APPLICATION_DATA */
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386 | i = s->handshake_func(s);
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387 | if (i < 0)
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388 | return (i);
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389 | if (i == 0) {
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390 | SSLerr(SSL_F_DTLS1_READ_BYTES, SSL_R_SSL_HANDSHAKE_FAILURE);
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391 | return (-1);
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392 | }
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393 | }
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394 |
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395 | start:
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396 | s->rwstate = SSL_NOTHING;
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397 |
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398 | /*-
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399 | * s->s3->rrec.type - is the type of record
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400 | * s->s3->rrec.data, - data
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401 | * s->s3->rrec.off, - offset into 'data' for next read
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402 | * s->s3->rrec.length, - number of bytes.
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403 | */
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404 | rr = s->rlayer.rrec;
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405 |
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406 | /*
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407 | * We are not handshaking and have no data yet, so process data buffered
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408 | * during the last handshake in advance, if any.
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409 | */
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410 | if (SSL_is_init_finished(s) && SSL3_RECORD_get_length(rr) == 0) {
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411 | pitem *item;
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412 | item = pqueue_pop(s->rlayer.d->buffered_app_data.q);
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413 | if (item) {
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414 | #ifndef OPENSSL_NO_SCTP
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415 | /* Restore bio_dgram_sctp_rcvinfo struct */
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416 | if (BIO_dgram_is_sctp(SSL_get_rbio(s))) {
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417 | DTLS1_RECORD_DATA *rdata = (DTLS1_RECORD_DATA *)item->data;
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418 | BIO_ctrl(SSL_get_rbio(s), BIO_CTRL_DGRAM_SCTP_SET_RCVINFO,
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419 | sizeof(rdata->recordinfo), &rdata->recordinfo);
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420 | }
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421 | #endif
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422 |
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423 | dtls1_copy_record(s, item);
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424 |
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---|
425 | OPENSSL_free(item->data);
|
---|
426 | pitem_free(item);
|
---|
427 | }
|
---|
428 | }
|
---|
429 |
|
---|
430 | /* Check for timeout */
|
---|
431 | if (dtls1_handle_timeout(s) > 0)
|
---|
432 | goto start;
|
---|
433 |
|
---|
434 | /* get new packet if necessary */
|
---|
435 | if ((SSL3_RECORD_get_length(rr) == 0)
|
---|
436 | || (s->rlayer.rstate == SSL_ST_READ_BODY)) {
|
---|
437 | ret = dtls1_get_record(s);
|
---|
438 | if (ret <= 0) {
|
---|
439 | ret = dtls1_read_failed(s, ret);
|
---|
440 | /* anything other than a timeout is an error */
|
---|
441 | if (ret <= 0)
|
---|
442 | return (ret);
|
---|
443 | else
|
---|
444 | goto start;
|
---|
445 | }
|
---|
446 | }
|
---|
447 |
|
---|
448 | /*
|
---|
449 | * Reset the count of consecutive warning alerts if we've got a non-empty
|
---|
450 | * record that isn't an alert.
|
---|
451 | */
|
---|
452 | if (SSL3_RECORD_get_type(rr) != SSL3_RT_ALERT
|
---|
453 | && SSL3_RECORD_get_length(rr) != 0)
|
---|
454 | s->rlayer.alert_count = 0;
|
---|
455 |
|
---|
456 | /* we now have a packet which can be read and processed */
|
---|
457 |
|
---|
458 | if (s->s3->change_cipher_spec /* set when we receive ChangeCipherSpec,
|
---|
459 | * reset by ssl3_get_finished */
|
---|
460 | && (SSL3_RECORD_get_type(rr) != SSL3_RT_HANDSHAKE)) {
|
---|
461 | /*
|
---|
462 | * We now have application data between CCS and Finished. Most likely
|
---|
463 | * the packets were reordered on their way, so buffer the application
|
---|
464 | * data for later processing rather than dropping the connection.
|
---|
465 | */
|
---|
466 | if (dtls1_buffer_record(s, &(s->rlayer.d->buffered_app_data),
|
---|
467 | SSL3_RECORD_get_seq_num(rr)) < 0) {
|
---|
468 | SSLerr(SSL_F_DTLS1_READ_BYTES, ERR_R_INTERNAL_ERROR);
|
---|
469 | return -1;
|
---|
470 | }
|
---|
471 | SSL3_RECORD_set_length(rr, 0);
|
---|
472 | goto start;
|
---|
473 | }
|
---|
474 |
|
---|
475 | /*
|
---|
476 | * If the other end has shut down, throw anything we read away (even in
|
---|
477 | * 'peek' mode)
|
---|
478 | */
|
---|
479 | if (s->shutdown & SSL_RECEIVED_SHUTDOWN) {
|
---|
480 | SSL3_RECORD_set_length(rr, 0);
|
---|
481 | s->rwstate = SSL_NOTHING;
|
---|
482 | return (0);
|
---|
483 | }
|
---|
484 |
|
---|
485 | if (type == SSL3_RECORD_get_type(rr)
|
---|
486 | || (SSL3_RECORD_get_type(rr) == SSL3_RT_CHANGE_CIPHER_SPEC
|
---|
487 | && type == SSL3_RT_HANDSHAKE && recvd_type != NULL)) {
|
---|
488 | /*
|
---|
489 | * SSL3_RT_APPLICATION_DATA or
|
---|
490 | * SSL3_RT_HANDSHAKE or
|
---|
491 | * SSL3_RT_CHANGE_CIPHER_SPEC
|
---|
492 | */
|
---|
493 | /*
|
---|
494 | * make sure that we are not getting application data when we are
|
---|
495 | * doing a handshake for the first time
|
---|
496 | */
|
---|
497 | if (SSL_in_init(s) && (type == SSL3_RT_APPLICATION_DATA) &&
|
---|
498 | (s->enc_read_ctx == NULL)) {
|
---|
499 | al = SSL_AD_UNEXPECTED_MESSAGE;
|
---|
500 | SSLerr(SSL_F_DTLS1_READ_BYTES, SSL_R_APP_DATA_IN_HANDSHAKE);
|
---|
501 | goto f_err;
|
---|
502 | }
|
---|
503 |
|
---|
504 | if (recvd_type != NULL)
|
---|
505 | *recvd_type = SSL3_RECORD_get_type(rr);
|
---|
506 |
|
---|
507 | if (len <= 0)
|
---|
508 | return (len);
|
---|
509 |
|
---|
510 | if ((unsigned int)len > SSL3_RECORD_get_length(rr))
|
---|
511 | n = SSL3_RECORD_get_length(rr);
|
---|
512 | else
|
---|
513 | n = (unsigned int)len;
|
---|
514 |
|
---|
515 | memcpy(buf, &(SSL3_RECORD_get_data(rr)[SSL3_RECORD_get_off(rr)]), n);
|
---|
516 | if (!peek) {
|
---|
517 | SSL3_RECORD_sub_length(rr, n);
|
---|
518 | SSL3_RECORD_add_off(rr, n);
|
---|
519 | if (SSL3_RECORD_get_length(rr) == 0) {
|
---|
520 | s->rlayer.rstate = SSL_ST_READ_HEADER;
|
---|
521 | SSL3_RECORD_set_off(rr, 0);
|
---|
522 | }
|
---|
523 | }
|
---|
524 | #ifndef OPENSSL_NO_SCTP
|
---|
525 | /*
|
---|
526 | * We were about to renegotiate but had to read belated application
|
---|
527 | * data first, so retry.
|
---|
528 | */
|
---|
529 | if (BIO_dgram_is_sctp(SSL_get_rbio(s)) &&
|
---|
530 | SSL3_RECORD_get_type(rr) == SSL3_RT_APPLICATION_DATA &&
|
---|
531 | ossl_statem_in_sctp_read_sock(s)) {
|
---|
532 | s->rwstate = SSL_READING;
|
---|
533 | BIO_clear_retry_flags(SSL_get_rbio(s));
|
---|
534 | BIO_set_retry_read(SSL_get_rbio(s));
|
---|
535 | }
|
---|
536 |
|
---|
537 | /*
|
---|
538 | * We might had to delay a close_notify alert because of reordered
|
---|
539 | * app data. If there was an alert and there is no message to read
|
---|
540 | * anymore, finally set shutdown.
|
---|
541 | */
|
---|
542 | if (BIO_dgram_is_sctp(SSL_get_rbio(s)) &&
|
---|
543 | s->d1->shutdown_received
|
---|
544 | && !BIO_dgram_sctp_msg_waiting(SSL_get_rbio(s))) {
|
---|
545 | s->shutdown |= SSL_RECEIVED_SHUTDOWN;
|
---|
546 | return (0);
|
---|
547 | }
|
---|
548 | #endif
|
---|
549 | return (n);
|
---|
550 | }
|
---|
551 |
|
---|
552 | /*
|
---|
553 | * If we get here, then type != rr->type; if we have a handshake message,
|
---|
554 | * then it was unexpected (Hello Request or Client Hello).
|
---|
555 | */
|
---|
556 |
|
---|
557 | /*
|
---|
558 | * In case of record types for which we have 'fragment' storage, fill
|
---|
559 | * that so that we can process the data at a fixed place.
|
---|
560 | */
|
---|
561 | {
|
---|
562 | unsigned int k, dest_maxlen = 0;
|
---|
563 | unsigned char *dest = NULL;
|
---|
564 | unsigned int *dest_len = NULL;
|
---|
565 |
|
---|
566 | if (SSL3_RECORD_get_type(rr) == SSL3_RT_HANDSHAKE) {
|
---|
567 | dest_maxlen = sizeof s->rlayer.d->handshake_fragment;
|
---|
568 | dest = s->rlayer.d->handshake_fragment;
|
---|
569 | dest_len = &s->rlayer.d->handshake_fragment_len;
|
---|
570 | } else if (SSL3_RECORD_get_type(rr) == SSL3_RT_ALERT) {
|
---|
571 | dest_maxlen = sizeof(s->rlayer.d->alert_fragment);
|
---|
572 | dest = s->rlayer.d->alert_fragment;
|
---|
573 | dest_len = &s->rlayer.d->alert_fragment_len;
|
---|
574 | }
|
---|
575 | #ifndef OPENSSL_NO_HEARTBEATS
|
---|
576 | else if (SSL3_RECORD_get_type(rr) == DTLS1_RT_HEARTBEAT) {
|
---|
577 | /* We allow a 0 return */
|
---|
578 | if (dtls1_process_heartbeat(s, SSL3_RECORD_get_data(rr),
|
---|
579 | SSL3_RECORD_get_length(rr)) < 0) {
|
---|
580 | return -1;
|
---|
581 | }
|
---|
582 | /* Exit and notify application to read again */
|
---|
583 | SSL3_RECORD_set_length(rr, 0);
|
---|
584 | s->rwstate = SSL_READING;
|
---|
585 | BIO_clear_retry_flags(SSL_get_rbio(s));
|
---|
586 | BIO_set_retry_read(SSL_get_rbio(s));
|
---|
587 | return (-1);
|
---|
588 | }
|
---|
589 | #endif
|
---|
590 | /* else it's a CCS message, or application data or wrong */
|
---|
591 | else if (SSL3_RECORD_get_type(rr) != SSL3_RT_CHANGE_CIPHER_SPEC) {
|
---|
592 | /*
|
---|
593 | * Application data while renegotiating is allowed. Try again
|
---|
594 | * reading.
|
---|
595 | */
|
---|
596 | if (SSL3_RECORD_get_type(rr) == SSL3_RT_APPLICATION_DATA) {
|
---|
597 | BIO *bio;
|
---|
598 | s->s3->in_read_app_data = 2;
|
---|
599 | bio = SSL_get_rbio(s);
|
---|
600 | s->rwstate = SSL_READING;
|
---|
601 | BIO_clear_retry_flags(bio);
|
---|
602 | BIO_set_retry_read(bio);
|
---|
603 | return (-1);
|
---|
604 | }
|
---|
605 |
|
---|
606 | /* Not certain if this is the right error handling */
|
---|
607 | al = SSL_AD_UNEXPECTED_MESSAGE;
|
---|
608 | SSLerr(SSL_F_DTLS1_READ_BYTES, SSL_R_UNEXPECTED_RECORD);
|
---|
609 | goto f_err;
|
---|
610 | }
|
---|
611 |
|
---|
612 | if (dest_maxlen > 0) {
|
---|
613 | /*
|
---|
614 | * XDTLS: In a pathological case, the Client Hello may be
|
---|
615 | * fragmented--don't always expect dest_maxlen bytes
|
---|
616 | */
|
---|
617 | if (SSL3_RECORD_get_length(rr) < dest_maxlen) {
|
---|
618 | #ifdef DTLS1_AD_MISSING_HANDSHAKE_MESSAGE
|
---|
619 | /*
|
---|
620 | * for normal alerts rr->length is 2, while
|
---|
621 | * dest_maxlen is 7 if we were to handle this
|
---|
622 | * non-existing alert...
|
---|
623 | */
|
---|
624 | FIX ME;
|
---|
625 | #endif
|
---|
626 | s->rlayer.rstate = SSL_ST_READ_HEADER;
|
---|
627 | SSL3_RECORD_set_length(rr, 0);
|
---|
628 | goto start;
|
---|
629 | }
|
---|
630 |
|
---|
631 | /* now move 'n' bytes: */
|
---|
632 | for (k = 0; k < dest_maxlen; k++) {
|
---|
633 | dest[k] = SSL3_RECORD_get_data(rr)[SSL3_RECORD_get_off(rr)];
|
---|
634 | SSL3_RECORD_add_off(rr, 1);
|
---|
635 | SSL3_RECORD_add_length(rr, -1);
|
---|
636 | }
|
---|
637 | *dest_len = dest_maxlen;
|
---|
638 | }
|
---|
639 | }
|
---|
640 |
|
---|
641 | /*-
|
---|
642 | * s->rlayer.d->handshake_fragment_len == 12 iff rr->type == SSL3_RT_HANDSHAKE;
|
---|
643 | * s->rlayer.d->alert_fragment_len == 7 iff rr->type == SSL3_RT_ALERT.
|
---|
644 | * (Possibly rr is 'empty' now, i.e. rr->length may be 0.)
|
---|
645 | */
|
---|
646 |
|
---|
647 | /* If we are a client, check for an incoming 'Hello Request': */
|
---|
648 | if ((!s->server) &&
|
---|
649 | (s->rlayer.d->handshake_fragment_len >= DTLS1_HM_HEADER_LENGTH) &&
|
---|
650 | (s->rlayer.d->handshake_fragment[0] == SSL3_MT_HELLO_REQUEST) &&
|
---|
651 | (s->session != NULL) && (s->session->cipher != NULL)) {
|
---|
652 | s->rlayer.d->handshake_fragment_len = 0;
|
---|
653 |
|
---|
654 | if ((s->rlayer.d->handshake_fragment[1] != 0) ||
|
---|
655 | (s->rlayer.d->handshake_fragment[2] != 0) ||
|
---|
656 | (s->rlayer.d->handshake_fragment[3] != 0)) {
|
---|
657 | al = SSL_AD_DECODE_ERROR;
|
---|
658 | SSLerr(SSL_F_DTLS1_READ_BYTES, SSL_R_BAD_HELLO_REQUEST);
|
---|
659 | goto f_err;
|
---|
660 | }
|
---|
661 |
|
---|
662 | /*
|
---|
663 | * no need to check sequence number on HELLO REQUEST messages
|
---|
664 | */
|
---|
665 |
|
---|
666 | if (s->msg_callback)
|
---|
667 | s->msg_callback(0, s->version, SSL3_RT_HANDSHAKE,
|
---|
668 | s->rlayer.d->handshake_fragment, 4, s,
|
---|
669 | s->msg_callback_arg);
|
---|
670 |
|
---|
671 | if (SSL_is_init_finished(s) &&
|
---|
672 | !(s->s3->flags & SSL3_FLAGS_NO_RENEGOTIATE_CIPHERS) &&
|
---|
673 | !s->s3->renegotiate) {
|
---|
674 | s->d1->handshake_read_seq++;
|
---|
675 | s->new_session = 1;
|
---|
676 | ssl3_renegotiate(s);
|
---|
677 | if (ssl3_renegotiate_check(s)) {
|
---|
678 | i = s->handshake_func(s);
|
---|
679 | if (i < 0)
|
---|
680 | return (i);
|
---|
681 | if (i == 0) {
|
---|
682 | SSLerr(SSL_F_DTLS1_READ_BYTES, SSL_R_SSL_HANDSHAKE_FAILURE);
|
---|
683 | return (-1);
|
---|
684 | }
|
---|
685 |
|
---|
686 | if (!(s->mode & SSL_MODE_AUTO_RETRY)) {
|
---|
687 | if (SSL3_BUFFER_get_left(&s->rlayer.rbuf) == 0) {
|
---|
688 | /* no read-ahead left? */
|
---|
689 | BIO *bio;
|
---|
690 | /*
|
---|
691 | * In the case where we try to read application data,
|
---|
692 | * but we trigger an SSL handshake, we return -1 with
|
---|
693 | * the retry option set. Otherwise renegotiation may
|
---|
694 | * cause nasty problems in the blocking world
|
---|
695 | */
|
---|
696 | s->rwstate = SSL_READING;
|
---|
697 | bio = SSL_get_rbio(s);
|
---|
698 | BIO_clear_retry_flags(bio);
|
---|
699 | BIO_set_retry_read(bio);
|
---|
700 | return (-1);
|
---|
701 | }
|
---|
702 | }
|
---|
703 | }
|
---|
704 | }
|
---|
705 | /*
|
---|
706 | * we either finished a handshake or ignored the request, now try
|
---|
707 | * again to obtain the (application) data we were asked for
|
---|
708 | */
|
---|
709 | goto start;
|
---|
710 | }
|
---|
711 |
|
---|
712 | if (s->rlayer.d->alert_fragment_len >= DTLS1_AL_HEADER_LENGTH) {
|
---|
713 | int alert_level = s->rlayer.d->alert_fragment[0];
|
---|
714 | int alert_descr = s->rlayer.d->alert_fragment[1];
|
---|
715 |
|
---|
716 | s->rlayer.d->alert_fragment_len = 0;
|
---|
717 |
|
---|
718 | if (s->msg_callback)
|
---|
719 | s->msg_callback(0, s->version, SSL3_RT_ALERT,
|
---|
720 | s->rlayer.d->alert_fragment, 2, s,
|
---|
721 | s->msg_callback_arg);
|
---|
722 |
|
---|
723 | if (s->info_callback != NULL)
|
---|
724 | cb = s->info_callback;
|
---|
725 | else if (s->ctx->info_callback != NULL)
|
---|
726 | cb = s->ctx->info_callback;
|
---|
727 |
|
---|
728 | if (cb != NULL) {
|
---|
729 | j = (alert_level << 8) | alert_descr;
|
---|
730 | cb(s, SSL_CB_READ_ALERT, j);
|
---|
731 | }
|
---|
732 |
|
---|
733 | if (alert_level == SSL3_AL_WARNING) {
|
---|
734 | s->s3->warn_alert = alert_descr;
|
---|
735 |
|
---|
736 | s->rlayer.alert_count++;
|
---|
737 | if (s->rlayer.alert_count == MAX_WARN_ALERT_COUNT) {
|
---|
738 | al = SSL_AD_UNEXPECTED_MESSAGE;
|
---|
739 | SSLerr(SSL_F_DTLS1_READ_BYTES, SSL_R_TOO_MANY_WARN_ALERTS);
|
---|
740 | goto f_err;
|
---|
741 | }
|
---|
742 |
|
---|
743 | if (alert_descr == SSL_AD_CLOSE_NOTIFY) {
|
---|
744 | #ifndef OPENSSL_NO_SCTP
|
---|
745 | /*
|
---|
746 | * With SCTP and streams the socket may deliver app data
|
---|
747 | * after a close_notify alert. We have to check this first so
|
---|
748 | * that nothing gets discarded.
|
---|
749 | */
|
---|
750 | if (BIO_dgram_is_sctp(SSL_get_rbio(s)) &&
|
---|
751 | BIO_dgram_sctp_msg_waiting(SSL_get_rbio(s))) {
|
---|
752 | s->d1->shutdown_received = 1;
|
---|
753 | s->rwstate = SSL_READING;
|
---|
754 | BIO_clear_retry_flags(SSL_get_rbio(s));
|
---|
755 | BIO_set_retry_read(SSL_get_rbio(s));
|
---|
756 | return -1;
|
---|
757 | }
|
---|
758 | #endif
|
---|
759 | s->shutdown |= SSL_RECEIVED_SHUTDOWN;
|
---|
760 | return (0);
|
---|
761 | }
|
---|
762 | #if 0
|
---|
763 | /* XXX: this is a possible improvement in the future */
|
---|
764 | /* now check if it's a missing record */
|
---|
765 | if (alert_descr == DTLS1_AD_MISSING_HANDSHAKE_MESSAGE) {
|
---|
766 | unsigned short seq;
|
---|
767 | unsigned int frag_off;
|
---|
768 | unsigned char *p = &(s->rlayer.d->alert_fragment[2]);
|
---|
769 |
|
---|
770 | n2s(p, seq);
|
---|
771 | n2l3(p, frag_off);
|
---|
772 |
|
---|
773 | dtls1_retransmit_message(s,
|
---|
774 | dtls1_get_queue_priority
|
---|
775 | (frag->msg_header.seq, 0), frag_off,
|
---|
776 | &found);
|
---|
777 | if (!found && SSL_in_init(s)) {
|
---|
778 | /*
|
---|
779 | * fprintf( stderr,"in init = %d\n", SSL_in_init(s));
|
---|
780 | */
|
---|
781 | /*
|
---|
782 | * requested a message not yet sent, send an alert
|
---|
783 | * ourselves
|
---|
784 | */
|
---|
785 | ssl3_send_alert(s, SSL3_AL_WARNING,
|
---|
786 | DTLS1_AD_MISSING_HANDSHAKE_MESSAGE);
|
---|
787 | }
|
---|
788 | }
|
---|
789 | #endif
|
---|
790 | } else if (alert_level == SSL3_AL_FATAL) {
|
---|
791 | char tmp[16];
|
---|
792 |
|
---|
793 | s->rwstate = SSL_NOTHING;
|
---|
794 | s->s3->fatal_alert = alert_descr;
|
---|
795 | SSLerr(SSL_F_DTLS1_READ_BYTES, SSL_AD_REASON_OFFSET + alert_descr);
|
---|
796 | BIO_snprintf(tmp, sizeof tmp, "%d", alert_descr);
|
---|
797 | ERR_add_error_data(2, "SSL alert number ", tmp);
|
---|
798 | s->shutdown |= SSL_RECEIVED_SHUTDOWN;
|
---|
799 | SSL_CTX_remove_session(s->session_ctx, s->session);
|
---|
800 | return (0);
|
---|
801 | } else {
|
---|
802 | al = SSL_AD_ILLEGAL_PARAMETER;
|
---|
803 | SSLerr(SSL_F_DTLS1_READ_BYTES, SSL_R_UNKNOWN_ALERT_TYPE);
|
---|
804 | goto f_err;
|
---|
805 | }
|
---|
806 |
|
---|
807 | goto start;
|
---|
808 | }
|
---|
809 |
|
---|
810 | if (s->shutdown & SSL_SENT_SHUTDOWN) { /* but we have not received a
|
---|
811 | * shutdown */
|
---|
812 | s->rwstate = SSL_NOTHING;
|
---|
813 | SSL3_RECORD_set_length(rr, 0);
|
---|
814 | return (0);
|
---|
815 | }
|
---|
816 |
|
---|
817 | if (SSL3_RECORD_get_type(rr) == SSL3_RT_CHANGE_CIPHER_SPEC) {
|
---|
818 | /*
|
---|
819 | * We can't process a CCS now, because previous handshake messages
|
---|
820 | * are still missing, so just drop it.
|
---|
821 | */
|
---|
822 | SSL3_RECORD_set_length(rr, 0);
|
---|
823 | goto start;
|
---|
824 | }
|
---|
825 |
|
---|
826 | /*
|
---|
827 | * Unexpected handshake message (Client Hello, or protocol violation)
|
---|
828 | */
|
---|
829 | if ((s->rlayer.d->handshake_fragment_len >= DTLS1_HM_HEADER_LENGTH) &&
|
---|
830 | !ossl_statem_get_in_handshake(s)) {
|
---|
831 | struct hm_header_st msg_hdr;
|
---|
832 |
|
---|
833 | /* this may just be a stale retransmit */
|
---|
834 | dtls1_get_message_header(rr->data, &msg_hdr);
|
---|
835 | if (SSL3_RECORD_get_epoch(rr) != s->rlayer.d->r_epoch) {
|
---|
836 | SSL3_RECORD_set_length(rr, 0);
|
---|
837 | goto start;
|
---|
838 | }
|
---|
839 |
|
---|
840 | /*
|
---|
841 | * If we are server, we may have a repeated FINISHED of the client
|
---|
842 | * here, then retransmit our CCS and FINISHED.
|
---|
843 | */
|
---|
844 | if (msg_hdr.type == SSL3_MT_FINISHED) {
|
---|
845 | if (dtls1_check_timeout_num(s) < 0)
|
---|
846 | return -1;
|
---|
847 |
|
---|
848 | dtls1_retransmit_buffered_messages(s);
|
---|
849 | SSL3_RECORD_set_length(rr, 0);
|
---|
850 | goto start;
|
---|
851 | }
|
---|
852 |
|
---|
853 | if (SSL_is_init_finished(s) &&
|
---|
854 | !(s->s3->flags & SSL3_FLAGS_NO_RENEGOTIATE_CIPHERS)) {
|
---|
855 | ossl_statem_set_in_init(s, 1);
|
---|
856 | s->renegotiate = 1;
|
---|
857 | s->new_session = 1;
|
---|
858 | }
|
---|
859 | i = s->handshake_func(s);
|
---|
860 | if (i < 0)
|
---|
861 | return (i);
|
---|
862 | if (i == 0) {
|
---|
863 | SSLerr(SSL_F_DTLS1_READ_BYTES, SSL_R_SSL_HANDSHAKE_FAILURE);
|
---|
864 | return (-1);
|
---|
865 | }
|
---|
866 |
|
---|
867 | if (!(s->mode & SSL_MODE_AUTO_RETRY)) {
|
---|
868 | if (SSL3_BUFFER_get_left(&s->rlayer.rbuf) == 0) {
|
---|
869 | /* no read-ahead left? */
|
---|
870 | BIO *bio;
|
---|
871 | /*
|
---|
872 | * In the case where we try to read application data, but we
|
---|
873 | * trigger an SSL handshake, we return -1 with the retry
|
---|
874 | * option set. Otherwise renegotiation may cause nasty
|
---|
875 | * problems in the blocking world
|
---|
876 | */
|
---|
877 | s->rwstate = SSL_READING;
|
---|
878 | bio = SSL_get_rbio(s);
|
---|
879 | BIO_clear_retry_flags(bio);
|
---|
880 | BIO_set_retry_read(bio);
|
---|
881 | return (-1);
|
---|
882 | }
|
---|
883 | }
|
---|
884 | goto start;
|
---|
885 | }
|
---|
886 |
|
---|
887 | switch (SSL3_RECORD_get_type(rr)) {
|
---|
888 | default:
|
---|
889 | /* TLS just ignores unknown message types */
|
---|
890 | if (s->version == TLS1_VERSION) {
|
---|
891 | SSL3_RECORD_set_length(rr, 0);
|
---|
892 | goto start;
|
---|
893 | }
|
---|
894 | al = SSL_AD_UNEXPECTED_MESSAGE;
|
---|
895 | SSLerr(SSL_F_DTLS1_READ_BYTES, SSL_R_UNEXPECTED_RECORD);
|
---|
896 | goto f_err;
|
---|
897 | case SSL3_RT_CHANGE_CIPHER_SPEC:
|
---|
898 | case SSL3_RT_ALERT:
|
---|
899 | case SSL3_RT_HANDSHAKE:
|
---|
900 | /*
|
---|
901 | * we already handled all of these, with the possible exception of
|
---|
902 | * SSL3_RT_HANDSHAKE when ossl_statem_get_in_handshake(s) is true, but
|
---|
903 | * that should not happen when type != rr->type
|
---|
904 | */
|
---|
905 | al = SSL_AD_UNEXPECTED_MESSAGE;
|
---|
906 | SSLerr(SSL_F_DTLS1_READ_BYTES, ERR_R_INTERNAL_ERROR);
|
---|
907 | goto f_err;
|
---|
908 | case SSL3_RT_APPLICATION_DATA:
|
---|
909 | /*
|
---|
910 | * At this point, we were expecting handshake data, but have
|
---|
911 | * application data. If the library was running inside ssl3_read()
|
---|
912 | * (i.e. in_read_app_data is set) and it makes sense to read
|
---|
913 | * application data at this point (session renegotiation not yet
|
---|
914 | * started), we will indulge it.
|
---|
915 | */
|
---|
916 | if (s->s3->in_read_app_data &&
|
---|
917 | (s->s3->total_renegotiations != 0) &&
|
---|
918 | ossl_statem_app_data_allowed(s)) {
|
---|
919 | s->s3->in_read_app_data = 2;
|
---|
920 | return (-1);
|
---|
921 | } else {
|
---|
922 | al = SSL_AD_UNEXPECTED_MESSAGE;
|
---|
923 | SSLerr(SSL_F_DTLS1_READ_BYTES, SSL_R_UNEXPECTED_RECORD);
|
---|
924 | goto f_err;
|
---|
925 | }
|
---|
926 | }
|
---|
927 | /* not reached */
|
---|
928 |
|
---|
929 | f_err:
|
---|
930 | ssl3_send_alert(s, SSL3_AL_FATAL, al);
|
---|
931 | return (-1);
|
---|
932 | }
|
---|
933 |
|
---|
934 | /*
|
---|
935 | * this only happens when a client hello is received and a handshake
|
---|
936 | * is started.
|
---|
937 | */
|
---|
938 | static int have_handshake_fragment(SSL *s, int type, unsigned char *buf,
|
---|
939 | int len)
|
---|
940 | {
|
---|
941 |
|
---|
942 | if ((type == SSL3_RT_HANDSHAKE)
|
---|
943 | && (s->rlayer.d->handshake_fragment_len > 0))
|
---|
944 | /* (partially) satisfy request from storage */
|
---|
945 | {
|
---|
946 | unsigned char *src = s->rlayer.d->handshake_fragment;
|
---|
947 | unsigned char *dst = buf;
|
---|
948 | unsigned int k, n;
|
---|
949 |
|
---|
950 | /* peek == 0 */
|
---|
951 | n = 0;
|
---|
952 | while ((len > 0) && (s->rlayer.d->handshake_fragment_len > 0)) {
|
---|
953 | *dst++ = *src++;
|
---|
954 | len--;
|
---|
955 | s->rlayer.d->handshake_fragment_len--;
|
---|
956 | n++;
|
---|
957 | }
|
---|
958 | /* move any remaining fragment bytes: */
|
---|
959 | for (k = 0; k < s->rlayer.d->handshake_fragment_len; k++)
|
---|
960 | s->rlayer.d->handshake_fragment[k] = *src++;
|
---|
961 | return n;
|
---|
962 | }
|
---|
963 |
|
---|
964 | return 0;
|
---|
965 | }
|
---|
966 |
|
---|
967 | /*
|
---|
968 | * Call this to write data in records of type 'type' It will return <= 0 if
|
---|
969 | * not all data has been sent or non-blocking IO.
|
---|
970 | */
|
---|
971 | int dtls1_write_bytes(SSL *s, int type, const void *buf, int len)
|
---|
972 | {
|
---|
973 | int i;
|
---|
974 |
|
---|
975 | OPENSSL_assert(len <= SSL3_RT_MAX_PLAIN_LENGTH);
|
---|
976 | s->rwstate = SSL_NOTHING;
|
---|
977 | i = do_dtls1_write(s, type, buf, len, 0);
|
---|
978 | return i;
|
---|
979 | }
|
---|
980 |
|
---|
981 | int do_dtls1_write(SSL *s, int type, const unsigned char *buf,
|
---|
982 | unsigned int len, int create_empty_fragment)
|
---|
983 | {
|
---|
984 | unsigned char *p, *pseq;
|
---|
985 | int i, mac_size, clear = 0;
|
---|
986 | int prefix_len = 0;
|
---|
987 | int eivlen;
|
---|
988 | SSL3_RECORD wr;
|
---|
989 | SSL3_BUFFER *wb;
|
---|
990 | SSL_SESSION *sess;
|
---|
991 |
|
---|
992 | wb = &s->rlayer.wbuf[0];
|
---|
993 |
|
---|
994 | /*
|
---|
995 | * first check if there is a SSL3_BUFFER still being written out. This
|
---|
996 | * will happen with non blocking IO
|
---|
997 | */
|
---|
998 | if (SSL3_BUFFER_get_left(wb) != 0) {
|
---|
999 | OPENSSL_assert(0); /* XDTLS: want to see if we ever get here */
|
---|
1000 | return (ssl3_write_pending(s, type, buf, len));
|
---|
1001 | }
|
---|
1002 |
|
---|
1003 | /* If we have an alert to send, lets send it */
|
---|
1004 | if (s->s3->alert_dispatch) {
|
---|
1005 | i = s->method->ssl_dispatch_alert(s);
|
---|
1006 | if (i <= 0)
|
---|
1007 | return (i);
|
---|
1008 | /* if it went, fall through and send more stuff */
|
---|
1009 | }
|
---|
1010 |
|
---|
1011 | if (len == 0 && !create_empty_fragment)
|
---|
1012 | return 0;
|
---|
1013 |
|
---|
1014 | sess = s->session;
|
---|
1015 |
|
---|
1016 | if ((sess == NULL) ||
|
---|
1017 | (s->enc_write_ctx == NULL) || (EVP_MD_CTX_md(s->write_hash) == NULL))
|
---|
1018 | clear = 1;
|
---|
1019 |
|
---|
1020 | if (clear)
|
---|
1021 | mac_size = 0;
|
---|
1022 | else {
|
---|
1023 | mac_size = EVP_MD_CTX_size(s->write_hash);
|
---|
1024 | if (mac_size < 0)
|
---|
1025 | goto err;
|
---|
1026 | }
|
---|
1027 |
|
---|
1028 | p = SSL3_BUFFER_get_buf(wb) + prefix_len;
|
---|
1029 |
|
---|
1030 | /* write the header */
|
---|
1031 |
|
---|
1032 | *(p++) = type & 0xff;
|
---|
1033 | SSL3_RECORD_set_type(&wr, type);
|
---|
1034 | /*
|
---|
1035 | * Special case: for hello verify request, client version 1.0 and we
|
---|
1036 | * haven't decided which version to use yet send back using version 1.0
|
---|
1037 | * header: otherwise some clients will ignore it.
|
---|
1038 | */
|
---|
1039 | if (s->method->version == DTLS_ANY_VERSION &&
|
---|
1040 | s->max_proto_version != DTLS1_BAD_VER) {
|
---|
1041 | *(p++) = DTLS1_VERSION >> 8;
|
---|
1042 | *(p++) = DTLS1_VERSION & 0xff;
|
---|
1043 | } else {
|
---|
1044 | *(p++) = s->version >> 8;
|
---|
1045 | *(p++) = s->version & 0xff;
|
---|
1046 | }
|
---|
1047 |
|
---|
1048 | /* field where we are to write out packet epoch, seq num and len */
|
---|
1049 | pseq = p;
|
---|
1050 | p += 10;
|
---|
1051 |
|
---|
1052 | /* Explicit IV length, block ciphers appropriate version flag */
|
---|
1053 | if (s->enc_write_ctx) {
|
---|
1054 | int mode = EVP_CIPHER_CTX_mode(s->enc_write_ctx);
|
---|
1055 | if (mode == EVP_CIPH_CBC_MODE) {
|
---|
1056 | eivlen = EVP_CIPHER_CTX_iv_length(s->enc_write_ctx);
|
---|
1057 | if (eivlen <= 1)
|
---|
1058 | eivlen = 0;
|
---|
1059 | }
|
---|
1060 | /* Need explicit part of IV for GCM mode */
|
---|
1061 | else if (mode == EVP_CIPH_GCM_MODE)
|
---|
1062 | eivlen = EVP_GCM_TLS_EXPLICIT_IV_LEN;
|
---|
1063 | else if (mode == EVP_CIPH_CCM_MODE)
|
---|
1064 | eivlen = EVP_CCM_TLS_EXPLICIT_IV_LEN;
|
---|
1065 | else
|
---|
1066 | eivlen = 0;
|
---|
1067 | } else
|
---|
1068 | eivlen = 0;
|
---|
1069 |
|
---|
1070 | /* lets setup the record stuff. */
|
---|
1071 | SSL3_RECORD_set_data(&wr, p + eivlen); /* make room for IV in case of CBC */
|
---|
1072 | SSL3_RECORD_set_length(&wr, (int)len);
|
---|
1073 | SSL3_RECORD_set_input(&wr, (unsigned char *)buf);
|
---|
1074 |
|
---|
1075 | /*
|
---|
1076 | * we now 'read' from wr.input, wr.length bytes into wr.data
|
---|
1077 | */
|
---|
1078 |
|
---|
1079 | /* first we compress */
|
---|
1080 | if (s->compress != NULL) {
|
---|
1081 | if (!ssl3_do_compress(s, &wr)) {
|
---|
1082 | SSLerr(SSL_F_DO_DTLS1_WRITE, SSL_R_COMPRESSION_FAILURE);
|
---|
1083 | goto err;
|
---|
1084 | }
|
---|
1085 | } else {
|
---|
1086 | memcpy(SSL3_RECORD_get_data(&wr), SSL3_RECORD_get_input(&wr),
|
---|
1087 | SSL3_RECORD_get_length(&wr));
|
---|
1088 | SSL3_RECORD_reset_input(&wr);
|
---|
1089 | }
|
---|
1090 |
|
---|
1091 | /*
|
---|
1092 | * we should still have the output to wr.data and the input from
|
---|
1093 | * wr.input. Length should be wr.length. wr.data still points in the
|
---|
1094 | * wb->buf
|
---|
1095 | */
|
---|
1096 |
|
---|
1097 | if (mac_size != 0) {
|
---|
1098 | if (s->method->ssl3_enc->mac(s, &wr,
|
---|
1099 | &(p[SSL3_RECORD_get_length(&wr) + eivlen]),
|
---|
1100 | 1) < 0)
|
---|
1101 | goto err;
|
---|
1102 | SSL3_RECORD_add_length(&wr, mac_size);
|
---|
1103 | }
|
---|
1104 |
|
---|
1105 | /* this is true regardless of mac size */
|
---|
1106 | SSL3_RECORD_set_data(&wr, p);
|
---|
1107 | SSL3_RECORD_reset_input(&wr);
|
---|
1108 |
|
---|
1109 | if (eivlen)
|
---|
1110 | SSL3_RECORD_add_length(&wr, eivlen);
|
---|
1111 |
|
---|
1112 | if (s->method->ssl3_enc->enc(s, &wr, 1, 1) < 1)
|
---|
1113 | goto err;
|
---|
1114 |
|
---|
1115 | /* record length after mac and block padding */
|
---|
1116 | /*
|
---|
1117 | * if (type == SSL3_RT_APPLICATION_DATA || (type == SSL3_RT_ALERT && !
|
---|
1118 | * SSL_in_init(s)))
|
---|
1119 | */
|
---|
1120 |
|
---|
1121 | /* there's only one epoch between handshake and app data */
|
---|
1122 |
|
---|
1123 | s2n(s->rlayer.d->w_epoch, pseq);
|
---|
1124 |
|
---|
1125 | /* XDTLS: ?? */
|
---|
1126 | /*
|
---|
1127 | * else s2n(s->d1->handshake_epoch, pseq);
|
---|
1128 | */
|
---|
1129 |
|
---|
1130 | memcpy(pseq, &(s->rlayer.write_sequence[2]), 6);
|
---|
1131 | pseq += 6;
|
---|
1132 | s2n(SSL3_RECORD_get_length(&wr), pseq);
|
---|
1133 |
|
---|
1134 | if (s->msg_callback)
|
---|
1135 | s->msg_callback(1, 0, SSL3_RT_HEADER, pseq - DTLS1_RT_HEADER_LENGTH,
|
---|
1136 | DTLS1_RT_HEADER_LENGTH, s, s->msg_callback_arg);
|
---|
1137 |
|
---|
1138 | /*
|
---|
1139 | * we should now have wr.data pointing to the encrypted data, which is
|
---|
1140 | * wr->length long
|
---|
1141 | */
|
---|
1142 | SSL3_RECORD_set_type(&wr, type); /* not needed but helps for debugging */
|
---|
1143 | SSL3_RECORD_add_length(&wr, DTLS1_RT_HEADER_LENGTH);
|
---|
1144 |
|
---|
1145 | ssl3_record_sequence_update(&(s->rlayer.write_sequence[0]));
|
---|
1146 |
|
---|
1147 | if (create_empty_fragment) {
|
---|
1148 | /*
|
---|
1149 | * we are in a recursive call; just return the length, don't write
|
---|
1150 | * out anything here
|
---|
1151 | */
|
---|
1152 | return wr.length;
|
---|
1153 | }
|
---|
1154 |
|
---|
1155 | /* now let's set up wb */
|
---|
1156 | SSL3_BUFFER_set_left(wb, prefix_len + SSL3_RECORD_get_length(&wr));
|
---|
1157 | SSL3_BUFFER_set_offset(wb, 0);
|
---|
1158 |
|
---|
1159 | /*
|
---|
1160 | * memorize arguments so that ssl3_write_pending can detect bad write
|
---|
1161 | * retries later
|
---|
1162 | */
|
---|
1163 | s->rlayer.wpend_tot = len;
|
---|
1164 | s->rlayer.wpend_buf = buf;
|
---|
1165 | s->rlayer.wpend_type = type;
|
---|
1166 | s->rlayer.wpend_ret = len;
|
---|
1167 |
|
---|
1168 | /* we now just need to write the buffer */
|
---|
1169 | return ssl3_write_pending(s, type, buf, len);
|
---|
1170 | err:
|
---|
1171 | return -1;
|
---|
1172 | }
|
---|
1173 |
|
---|
1174 | DTLS1_BITMAP *dtls1_get_bitmap(SSL *s, SSL3_RECORD *rr,
|
---|
1175 | unsigned int *is_next_epoch)
|
---|
1176 | {
|
---|
1177 |
|
---|
1178 | *is_next_epoch = 0;
|
---|
1179 |
|
---|
1180 | /* In current epoch, accept HM, CCS, DATA, & ALERT */
|
---|
1181 | if (rr->epoch == s->rlayer.d->r_epoch)
|
---|
1182 | return &s->rlayer.d->bitmap;
|
---|
1183 |
|
---|
1184 | /*
|
---|
1185 | * Only HM and ALERT messages can be from the next epoch and only if we
|
---|
1186 | * have already processed all of the unprocessed records from the last
|
---|
1187 | * epoch
|
---|
1188 | */
|
---|
1189 | else if (rr->epoch == (unsigned long)(s->rlayer.d->r_epoch + 1) &&
|
---|
1190 | s->rlayer.d->unprocessed_rcds.epoch != s->rlayer.d->r_epoch &&
|
---|
1191 | (rr->type == SSL3_RT_HANDSHAKE || rr->type == SSL3_RT_ALERT)) {
|
---|
1192 | *is_next_epoch = 1;
|
---|
1193 | return &s->rlayer.d->next_bitmap;
|
---|
1194 | }
|
---|
1195 |
|
---|
1196 | return NULL;
|
---|
1197 | }
|
---|
1198 |
|
---|
1199 | void dtls1_reset_seq_numbers(SSL *s, int rw)
|
---|
1200 | {
|
---|
1201 | unsigned char *seq;
|
---|
1202 | unsigned int seq_bytes = sizeof(s->rlayer.read_sequence);
|
---|
1203 |
|
---|
1204 | if (rw & SSL3_CC_READ) {
|
---|
1205 | seq = s->rlayer.read_sequence;
|
---|
1206 | s->rlayer.d->r_epoch++;
|
---|
1207 | memcpy(&s->rlayer.d->bitmap, &s->rlayer.d->next_bitmap,
|
---|
1208 | sizeof(s->rlayer.d->bitmap));
|
---|
1209 | memset(&s->rlayer.d->next_bitmap, 0, sizeof(s->rlayer.d->next_bitmap));
|
---|
1210 |
|
---|
1211 | /*
|
---|
1212 | * We must not use any buffered messages received from the previous
|
---|
1213 | * epoch
|
---|
1214 | */
|
---|
1215 | dtls1_clear_received_buffer(s);
|
---|
1216 | } else {
|
---|
1217 | seq = s->rlayer.write_sequence;
|
---|
1218 | memcpy(s->rlayer.d->last_write_sequence, seq,
|
---|
1219 | sizeof(s->rlayer.write_sequence));
|
---|
1220 | s->rlayer.d->w_epoch++;
|
---|
1221 | }
|
---|
1222 |
|
---|
1223 | memset(seq, 0, seq_bytes);
|
---|
1224 | }
|
---|