1 | /*
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2 | * Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
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3 | *
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4 | * Licensed under the OpenSSL license (the "License"). You may not use
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5 | * this file except in compliance with the License. You can obtain a copy
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6 | * in the file LICENSE in the source distribution or at
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7 | * https://www.openssl.org/source/license.html
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8 | */
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9 |
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10 | #include <stdio.h>
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11 | #include <limits.h>
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12 | #include <errno.h>
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13 | #define USE_SOCKETS
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14 | #include "../ssl_locl.h"
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15 | #include <openssl/evp.h>
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16 | #include <openssl/buffer.h>
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17 | #include <openssl/rand.h>
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18 | #include "record_locl.h"
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19 |
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20 | #if defined(OPENSSL_SMALL_FOOTPRINT) || \
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21 | !( defined(AES_ASM) && ( \
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22 | defined(__x86_64) || defined(__x86_64__) || \
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23 | defined(_M_AMD64) || defined(_M_X64) ) \
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24 | )
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25 | # undef EVP_CIPH_FLAG_TLS1_1_MULTIBLOCK
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26 | # define EVP_CIPH_FLAG_TLS1_1_MULTIBLOCK 0
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27 | #endif
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28 |
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29 | void RECORD_LAYER_init(RECORD_LAYER *rl, SSL *s)
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30 | {
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31 | rl->s = s;
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32 | RECORD_LAYER_set_first_record(&s->rlayer);
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33 | SSL3_RECORD_clear(rl->rrec, SSL_MAX_PIPELINES);
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34 | }
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35 |
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36 | void RECORD_LAYER_clear(RECORD_LAYER *rl)
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37 | {
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38 | rl->rstate = SSL_ST_READ_HEADER;
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39 |
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40 | /*
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41 | * Do I need to clear read_ahead? As far as I can tell read_ahead did not
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42 | * previously get reset by SSL_clear...so I'll keep it that way..but is
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43 | * that right?
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44 | */
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45 |
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46 | rl->packet = NULL;
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47 | rl->packet_length = 0;
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48 | rl->wnum = 0;
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49 | memset(rl->alert_fragment, 0, sizeof(rl->alert_fragment));
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50 | rl->alert_fragment_len = 0;
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51 | memset(rl->handshake_fragment, 0, sizeof(rl->handshake_fragment));
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52 | rl->handshake_fragment_len = 0;
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53 | rl->wpend_tot = 0;
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54 | rl->wpend_type = 0;
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55 | rl->wpend_ret = 0;
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56 | rl->wpend_buf = NULL;
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57 |
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58 | SSL3_BUFFER_clear(&rl->rbuf);
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59 | ssl3_release_write_buffer(rl->s);
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60 | rl->numrpipes = 0;
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61 | SSL3_RECORD_clear(rl->rrec, SSL_MAX_PIPELINES);
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62 |
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63 | RECORD_LAYER_reset_read_sequence(rl);
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64 | RECORD_LAYER_reset_write_sequence(rl);
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65 |
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66 | if (rl->d)
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67 | DTLS_RECORD_LAYER_clear(rl);
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68 | }
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69 |
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70 | void RECORD_LAYER_release(RECORD_LAYER *rl)
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71 | {
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72 | if (SSL3_BUFFER_is_initialised(&rl->rbuf))
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73 | ssl3_release_read_buffer(rl->s);
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74 | if (rl->numwpipes > 0)
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75 | ssl3_release_write_buffer(rl->s);
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76 | SSL3_RECORD_release(rl->rrec, SSL_MAX_PIPELINES);
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77 | }
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78 |
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79 | int RECORD_LAYER_read_pending(const RECORD_LAYER *rl)
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80 | {
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81 | return SSL3_BUFFER_get_left(&rl->rbuf) != 0;
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82 | }
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83 |
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84 | int RECORD_LAYER_write_pending(const RECORD_LAYER *rl)
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85 | {
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86 | return (rl->numwpipes > 0)
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87 | && SSL3_BUFFER_get_left(&rl->wbuf[rl->numwpipes - 1]) != 0;
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88 | }
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89 |
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90 | int RECORD_LAYER_set_data(RECORD_LAYER *rl, const unsigned char *buf, int len)
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91 | {
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92 | rl->packet_length = len;
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93 | if (len != 0) {
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94 | rl->rstate = SSL_ST_READ_HEADER;
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95 | if (!SSL3_BUFFER_is_initialised(&rl->rbuf))
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96 | if (!ssl3_setup_read_buffer(rl->s))
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97 | return 0;
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98 | }
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99 |
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100 | rl->packet = SSL3_BUFFER_get_buf(&rl->rbuf);
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101 | SSL3_BUFFER_set_data(&rl->rbuf, buf, len);
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102 |
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103 | return 1;
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104 | }
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105 |
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106 | void RECORD_LAYER_reset_read_sequence(RECORD_LAYER *rl)
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107 | {
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108 | memset(rl->read_sequence, 0, sizeof(rl->read_sequence));
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109 | }
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110 |
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111 | void RECORD_LAYER_reset_write_sequence(RECORD_LAYER *rl)
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112 | {
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113 | memset(rl->write_sequence, 0, sizeof(rl->write_sequence));
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114 | }
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115 |
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116 | int ssl3_pending(const SSL *s)
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117 | {
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118 | unsigned int i;
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119 | int num = 0;
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120 |
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121 | if (s->rlayer.rstate == SSL_ST_READ_BODY)
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122 | return 0;
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123 |
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124 | for (i = 0; i < RECORD_LAYER_get_numrpipes(&s->rlayer); i++) {
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125 | if (SSL3_RECORD_get_type(&s->rlayer.rrec[i])
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126 | != SSL3_RT_APPLICATION_DATA)
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127 | return 0;
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128 | num += SSL3_RECORD_get_length(&s->rlayer.rrec[i]);
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129 | }
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130 |
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131 | return num;
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132 | }
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133 |
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134 | void SSL_CTX_set_default_read_buffer_len(SSL_CTX *ctx, size_t len)
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135 | {
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136 | ctx->default_read_buf_len = len;
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137 | }
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138 |
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139 | void SSL_set_default_read_buffer_len(SSL *s, size_t len)
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140 | {
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141 | SSL3_BUFFER_set_default_len(RECORD_LAYER_get_rbuf(&s->rlayer), len);
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142 | }
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143 |
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144 | const char *SSL_rstate_string_long(const SSL *s)
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145 | {
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146 | switch (s->rlayer.rstate) {
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147 | case SSL_ST_READ_HEADER:
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148 | return "read header";
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149 | case SSL_ST_READ_BODY:
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150 | return "read body";
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151 | case SSL_ST_READ_DONE:
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152 | return "read done";
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153 | default:
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154 | return "unknown";
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155 | }
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156 | }
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157 |
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158 | const char *SSL_rstate_string(const SSL *s)
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159 | {
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160 | switch (s->rlayer.rstate) {
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161 | case SSL_ST_READ_HEADER:
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162 | return "RH";
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163 | case SSL_ST_READ_BODY:
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164 | return "RB";
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165 | case SSL_ST_READ_DONE:
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166 | return "RD";
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167 | default:
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168 | return "unknown";
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169 | }
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170 | }
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171 |
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172 | /*
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173 | * Return values are as per SSL_read()
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174 | */
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175 | int ssl3_read_n(SSL *s, int n, int max, int extend, int clearold)
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176 | {
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177 | /*
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178 | * If extend == 0, obtain new n-byte packet; if extend == 1, increase
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179 | * packet by another n bytes. The packet will be in the sub-array of
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180 | * s->s3->rbuf.buf specified by s->packet and s->packet_length. (If
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181 | * s->rlayer.read_ahead is set, 'max' bytes may be stored in rbuf [plus
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182 | * s->packet_length bytes if extend == 1].)
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183 | * if clearold == 1, move the packet to the start of the buffer; if
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184 | * clearold == 0 then leave any old packets where they were
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185 | */
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186 | int i, len, left;
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187 | size_t align = 0;
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188 | unsigned char *pkt;
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189 | SSL3_BUFFER *rb;
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190 |
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191 | if (n <= 0)
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192 | return n;
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193 |
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194 | rb = &s->rlayer.rbuf;
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195 | if (rb->buf == NULL)
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196 | if (!ssl3_setup_read_buffer(s))
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197 | return -1;
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198 |
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199 | left = rb->left;
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200 | #if defined(SSL3_ALIGN_PAYLOAD) && SSL3_ALIGN_PAYLOAD!=0
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201 | align = (size_t)rb->buf + SSL3_RT_HEADER_LENGTH;
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202 | align = SSL3_ALIGN_PAYLOAD - 1 - ((align - 1) % SSL3_ALIGN_PAYLOAD);
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203 | #endif
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204 |
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205 | if (!extend) {
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206 | /* start with empty packet ... */
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207 | if (left == 0)
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208 | rb->offset = align;
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209 | else if (align != 0 && left >= SSL3_RT_HEADER_LENGTH) {
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210 | /*
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211 | * check if next packet length is large enough to justify payload
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212 | * alignment...
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213 | */
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214 | pkt = rb->buf + rb->offset;
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215 | if (pkt[0] == SSL3_RT_APPLICATION_DATA
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216 | && (pkt[3] << 8 | pkt[4]) >= 128) {
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217 | /*
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218 | * Note that even if packet is corrupted and its length field
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219 | * is insane, we can only be led to wrong decision about
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220 | * whether memmove will occur or not. Header values has no
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221 | * effect on memmove arguments and therefore no buffer
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222 | * overrun can be triggered.
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223 | */
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224 | memmove(rb->buf + align, pkt, left);
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225 | rb->offset = align;
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226 | }
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227 | }
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228 | s->rlayer.packet = rb->buf + rb->offset;
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229 | s->rlayer.packet_length = 0;
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230 | /* ... now we can act as if 'extend' was set */
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231 | }
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232 |
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233 | len = s->rlayer.packet_length;
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234 | pkt = rb->buf + align;
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235 | /*
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236 | * Move any available bytes to front of buffer: 'len' bytes already
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237 | * pointed to by 'packet', 'left' extra ones at the end
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238 | */
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239 | if (s->rlayer.packet != pkt && clearold == 1) {
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240 | memmove(pkt, s->rlayer.packet, len + left);
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241 | s->rlayer.packet = pkt;
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242 | rb->offset = len + align;
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243 | }
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244 |
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245 | /*
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246 | * For DTLS/UDP reads should not span multiple packets because the read
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247 | * operation returns the whole packet at once (as long as it fits into
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248 | * the buffer).
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249 | */
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250 | if (SSL_IS_DTLS(s)) {
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251 | if (left == 0 && extend)
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252 | return 0;
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253 | if (left > 0 && n > left)
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254 | n = left;
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255 | }
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256 |
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257 | /* if there is enough in the buffer from a previous read, take some */
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258 | if (left >= n) {
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259 | s->rlayer.packet_length += n;
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260 | rb->left = left - n;
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261 | rb->offset += n;
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262 | return (n);
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263 | }
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264 |
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265 | /* else we need to read more data */
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266 |
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267 | if (n > (int)(rb->len - rb->offset)) { /* does not happen */
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268 | SSLerr(SSL_F_SSL3_READ_N, ERR_R_INTERNAL_ERROR);
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269 | return -1;
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270 | }
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271 |
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272 | /* We always act like read_ahead is set for DTLS */
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273 | if (!s->rlayer.read_ahead && !SSL_IS_DTLS(s))
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274 | /* ignore max parameter */
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275 | max = n;
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276 | else {
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277 | if (max < n)
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278 | max = n;
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279 | if (max > (int)(rb->len - rb->offset))
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280 | max = rb->len - rb->offset;
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281 | }
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282 |
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283 | while (left < n) {
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284 | /*
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285 | * Now we have len+left bytes at the front of s->s3->rbuf.buf and
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286 | * need to read in more until we have len+n (up to len+max if
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287 | * possible)
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288 | */
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289 |
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290 | clear_sys_error();
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291 | if (s->rbio != NULL) {
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292 | s->rwstate = SSL_READING;
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293 | i = BIO_read(s->rbio, pkt + len + left, max - left);
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294 | } else {
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295 | SSLerr(SSL_F_SSL3_READ_N, SSL_R_READ_BIO_NOT_SET);
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296 | i = -1;
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297 | }
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298 |
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299 | if (i <= 0) {
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300 | rb->left = left;
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301 | if (s->mode & SSL_MODE_RELEASE_BUFFERS && !SSL_IS_DTLS(s))
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302 | if (len + left == 0)
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303 | ssl3_release_read_buffer(s);
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304 | return i;
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305 | }
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306 | left += i;
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307 | /*
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308 | * reads should *never* span multiple packets for DTLS because the
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309 | * underlying transport protocol is message oriented as opposed to
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310 | * byte oriented as in the TLS case.
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311 | */
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312 | if (SSL_IS_DTLS(s)) {
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313 | if (n > left)
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314 | n = left; /* makes the while condition false */
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315 | }
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316 | }
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317 |
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318 | /* done reading, now the book-keeping */
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319 | rb->offset += n;
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320 | rb->left = left - n;
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321 | s->rlayer.packet_length += n;
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322 | s->rwstate = SSL_NOTHING;
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323 | return (n);
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324 | }
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325 |
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326 | /*
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327 | * Call this to write data in records of type 'type' It will return <= 0 if
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328 | * not all data has been sent or non-blocking IO.
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329 | */
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330 | int ssl3_write_bytes(SSL *s, int type, const void *buf_, int len)
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331 | {
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332 | const unsigned char *buf = buf_;
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333 | int tot;
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334 | unsigned int n, split_send_fragment, maxpipes;
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335 | #if !defined(OPENSSL_NO_MULTIBLOCK) && EVP_CIPH_FLAG_TLS1_1_MULTIBLOCK
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336 | unsigned int max_send_fragment, nw;
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337 | unsigned int u_len = (unsigned int)len;
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338 | #endif
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339 | SSL3_BUFFER *wb = &s->rlayer.wbuf[0];
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340 | int i;
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341 |
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342 | if (len < 0) {
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343 | SSLerr(SSL_F_SSL3_WRITE_BYTES, SSL_R_SSL_NEGATIVE_LENGTH);
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344 | return -1;
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345 | }
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346 |
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347 | s->rwstate = SSL_NOTHING;
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348 | tot = s->rlayer.wnum;
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349 | /*
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350 | * ensure that if we end up with a smaller value of data to write out
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351 | * than the the original len from a write which didn't complete for
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352 | * non-blocking I/O and also somehow ended up avoiding the check for
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353 | * this in ssl3_write_pending/SSL_R_BAD_WRITE_RETRY as it must never be
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354 | * possible to end up with (len-tot) as a large number that will then
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355 | * promptly send beyond the end of the users buffer ... so we trap and
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356 | * report the error in a way the user will notice
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357 | */
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358 | if ((unsigned int)len < s->rlayer.wnum) {
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359 | SSLerr(SSL_F_SSL3_WRITE_BYTES, SSL_R_BAD_LENGTH);
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360 | return -1;
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361 | }
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362 |
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363 | s->rlayer.wnum = 0;
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364 |
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365 | if (SSL_in_init(s) && !ossl_statem_get_in_handshake(s)) {
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366 | i = s->handshake_func(s);
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367 | if (i < 0)
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368 | return (i);
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369 | if (i == 0) {
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370 | SSLerr(SSL_F_SSL3_WRITE_BYTES, SSL_R_SSL_HANDSHAKE_FAILURE);
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371 | return -1;
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372 | }
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373 | }
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374 |
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375 | /*
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376 | * first check if there is a SSL3_BUFFER still being written out. This
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377 | * will happen with non blocking IO
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378 | */
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379 | if (wb->left != 0) {
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380 | i = ssl3_write_pending(s, type, &buf[tot], s->rlayer.wpend_tot);
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381 | if (i <= 0) {
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382 | /* XXX should we ssl3_release_write_buffer if i<0? */
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383 | s->rlayer.wnum = tot;
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384 | return i;
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385 | }
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386 | tot += i; /* this might be last fragment */
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387 | }
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388 | #if !defined(OPENSSL_NO_MULTIBLOCK) && EVP_CIPH_FLAG_TLS1_1_MULTIBLOCK
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389 | /*
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390 | * Depending on platform multi-block can deliver several *times*
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391 | * better performance. Downside is that it has to allocate
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392 | * jumbo buffer to accommodate up to 8 records, but the
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393 | * compromise is considered worthy.
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394 | */
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395 | if (type == SSL3_RT_APPLICATION_DATA &&
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396 | u_len >= 4 * (max_send_fragment = s->max_send_fragment) &&
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397 | s->compress == NULL && s->msg_callback == NULL &&
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398 | !SSL_WRITE_ETM(s) && SSL_USE_EXPLICIT_IV(s) &&
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399 | EVP_CIPHER_flags(EVP_CIPHER_CTX_cipher(s->enc_write_ctx)) &
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400 | EVP_CIPH_FLAG_TLS1_1_MULTIBLOCK) {
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401 | unsigned char aad[13];
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402 | EVP_CTRL_TLS1_1_MULTIBLOCK_PARAM mb_param;
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403 | int packlen;
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404 |
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405 | /* minimize address aliasing conflicts */
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406 | if ((max_send_fragment & 0xfff) == 0)
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407 | max_send_fragment -= 512;
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408 |
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409 | if (tot == 0 || wb->buf == NULL) { /* allocate jumbo buffer */
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410 | ssl3_release_write_buffer(s);
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411 |
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412 | packlen = EVP_CIPHER_CTX_ctrl(s->enc_write_ctx,
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413 | EVP_CTRL_TLS1_1_MULTIBLOCK_MAX_BUFSIZE,
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414 | max_send_fragment, NULL);
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415 |
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416 | if (u_len >= 8 * max_send_fragment)
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417 | packlen *= 8;
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418 | else
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419 | packlen *= 4;
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420 |
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421 | if (!ssl3_setup_write_buffer(s, 1, packlen)) {
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422 | SSLerr(SSL_F_SSL3_WRITE_BYTES, ERR_R_MALLOC_FAILURE);
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423 | return -1;
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424 | }
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425 | } else if (tot == len) { /* done? */
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426 | /* free jumbo buffer */
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427 | ssl3_release_write_buffer(s);
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428 | return tot;
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429 | }
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430 |
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431 | n = (len - tot);
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432 | for (;;) {
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433 | if (n < 4 * max_send_fragment) {
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434 | /* free jumbo buffer */
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435 | ssl3_release_write_buffer(s);
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436 | break;
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437 | }
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438 |
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439 | if (s->s3->alert_dispatch) {
|
---|
440 | i = s->method->ssl_dispatch_alert(s);
|
---|
441 | if (i <= 0) {
|
---|
442 | s->rlayer.wnum = tot;
|
---|
443 | return i;
|
---|
444 | }
|
---|
445 | }
|
---|
446 |
|
---|
447 | if (n >= 8 * max_send_fragment)
|
---|
448 | nw = max_send_fragment * (mb_param.interleave = 8);
|
---|
449 | else
|
---|
450 | nw = max_send_fragment * (mb_param.interleave = 4);
|
---|
451 |
|
---|
452 | memcpy(aad, s->rlayer.write_sequence, 8);
|
---|
453 | aad[8] = type;
|
---|
454 | aad[9] = (unsigned char)(s->version >> 8);
|
---|
455 | aad[10] = (unsigned char)(s->version);
|
---|
456 | aad[11] = 0;
|
---|
457 | aad[12] = 0;
|
---|
458 | mb_param.out = NULL;
|
---|
459 | mb_param.inp = aad;
|
---|
460 | mb_param.len = nw;
|
---|
461 |
|
---|
462 | packlen = EVP_CIPHER_CTX_ctrl(s->enc_write_ctx,
|
---|
463 | EVP_CTRL_TLS1_1_MULTIBLOCK_AAD,
|
---|
464 | sizeof(mb_param), &mb_param);
|
---|
465 |
|
---|
466 | if (packlen <= 0 || packlen > (int)wb->len) { /* never happens */
|
---|
467 | /* free jumbo buffer */
|
---|
468 | ssl3_release_write_buffer(s);
|
---|
469 | break;
|
---|
470 | }
|
---|
471 |
|
---|
472 | mb_param.out = wb->buf;
|
---|
473 | mb_param.inp = &buf[tot];
|
---|
474 | mb_param.len = nw;
|
---|
475 |
|
---|
476 | if (EVP_CIPHER_CTX_ctrl(s->enc_write_ctx,
|
---|
477 | EVP_CTRL_TLS1_1_MULTIBLOCK_ENCRYPT,
|
---|
478 | sizeof(mb_param), &mb_param) <= 0)
|
---|
479 | return -1;
|
---|
480 |
|
---|
481 | s->rlayer.write_sequence[7] += mb_param.interleave;
|
---|
482 | if (s->rlayer.write_sequence[7] < mb_param.interleave) {
|
---|
483 | int j = 6;
|
---|
484 | while (j >= 0 && (++s->rlayer.write_sequence[j--]) == 0) ;
|
---|
485 | }
|
---|
486 |
|
---|
487 | wb->offset = 0;
|
---|
488 | wb->left = packlen;
|
---|
489 |
|
---|
490 | s->rlayer.wpend_tot = nw;
|
---|
491 | s->rlayer.wpend_buf = &buf[tot];
|
---|
492 | s->rlayer.wpend_type = type;
|
---|
493 | s->rlayer.wpend_ret = nw;
|
---|
494 |
|
---|
495 | i = ssl3_write_pending(s, type, &buf[tot], nw);
|
---|
496 | if (i <= 0) {
|
---|
497 | if (i < 0 && (!s->wbio || !BIO_should_retry(s->wbio))) {
|
---|
498 | /* free jumbo buffer */
|
---|
499 | ssl3_release_write_buffer(s);
|
---|
500 | }
|
---|
501 | s->rlayer.wnum = tot;
|
---|
502 | return i;
|
---|
503 | }
|
---|
504 | if (i == (int)n) {
|
---|
505 | /* free jumbo buffer */
|
---|
506 | ssl3_release_write_buffer(s);
|
---|
507 | return tot + i;
|
---|
508 | }
|
---|
509 | n -= i;
|
---|
510 | tot += i;
|
---|
511 | }
|
---|
512 | } else
|
---|
513 | #endif
|
---|
514 | if (tot == len) { /* done? */
|
---|
515 | if (s->mode & SSL_MODE_RELEASE_BUFFERS && !SSL_IS_DTLS(s))
|
---|
516 | ssl3_release_write_buffer(s);
|
---|
517 |
|
---|
518 | return tot;
|
---|
519 | }
|
---|
520 |
|
---|
521 | n = (len - tot);
|
---|
522 |
|
---|
523 | split_send_fragment = s->split_send_fragment;
|
---|
524 | /*
|
---|
525 | * If max_pipelines is 0 then this means "undefined" and we default to
|
---|
526 | * 1 pipeline. Similarly if the cipher does not support pipelined
|
---|
527 | * processing then we also only use 1 pipeline, or if we're not using
|
---|
528 | * explicit IVs
|
---|
529 | */
|
---|
530 | maxpipes = s->max_pipelines;
|
---|
531 | if (maxpipes > SSL_MAX_PIPELINES) {
|
---|
532 | /*
|
---|
533 | * We should have prevented this when we set max_pipelines so we
|
---|
534 | * shouldn't get here
|
---|
535 | */
|
---|
536 | SSLerr(SSL_F_SSL3_WRITE_BYTES, ERR_R_INTERNAL_ERROR);
|
---|
537 | return -1;
|
---|
538 | }
|
---|
539 | if (maxpipes == 0
|
---|
540 | || s->enc_write_ctx == NULL
|
---|
541 | || !(EVP_CIPHER_flags(EVP_CIPHER_CTX_cipher(s->enc_write_ctx))
|
---|
542 | & EVP_CIPH_FLAG_PIPELINE)
|
---|
543 | || !SSL_USE_EXPLICIT_IV(s))
|
---|
544 | maxpipes = 1;
|
---|
545 | if (s->max_send_fragment == 0 || split_send_fragment > s->max_send_fragment
|
---|
546 | || split_send_fragment == 0) {
|
---|
547 | /*
|
---|
548 | * We should have prevented this when we set the split and max send
|
---|
549 | * fragments so we shouldn't get here
|
---|
550 | */
|
---|
551 | SSLerr(SSL_F_SSL3_WRITE_BYTES, ERR_R_INTERNAL_ERROR);
|
---|
552 | return -1;
|
---|
553 | }
|
---|
554 |
|
---|
555 | for (;;) {
|
---|
556 | unsigned int pipelens[SSL_MAX_PIPELINES], tmppipelen, remain;
|
---|
557 | unsigned int numpipes, j;
|
---|
558 |
|
---|
559 | if (n == 0)
|
---|
560 | numpipes = 1;
|
---|
561 | else
|
---|
562 | numpipes = ((n - 1) / split_send_fragment) + 1;
|
---|
563 | if (numpipes > maxpipes)
|
---|
564 | numpipes = maxpipes;
|
---|
565 |
|
---|
566 | if (n / numpipes >= s->max_send_fragment) {
|
---|
567 | /*
|
---|
568 | * We have enough data to completely fill all available
|
---|
569 | * pipelines
|
---|
570 | */
|
---|
571 | for (j = 0; j < numpipes; j++) {
|
---|
572 | pipelens[j] = s->max_send_fragment;
|
---|
573 | }
|
---|
574 | } else {
|
---|
575 | /* We can partially fill all available pipelines */
|
---|
576 | tmppipelen = n / numpipes;
|
---|
577 | remain = n % numpipes;
|
---|
578 | for (j = 0; j < numpipes; j++) {
|
---|
579 | pipelens[j] = tmppipelen;
|
---|
580 | if (j < remain)
|
---|
581 | pipelens[j]++;
|
---|
582 | }
|
---|
583 | }
|
---|
584 |
|
---|
585 | i = do_ssl3_write(s, type, &(buf[tot]), pipelens, numpipes, 0);
|
---|
586 | if (i <= 0) {
|
---|
587 | /* XXX should we ssl3_release_write_buffer if i<0? */
|
---|
588 | s->rlayer.wnum = tot;
|
---|
589 | return i;
|
---|
590 | }
|
---|
591 |
|
---|
592 | if ((i == (int)n) ||
|
---|
593 | (type == SSL3_RT_APPLICATION_DATA &&
|
---|
594 | (s->mode & SSL_MODE_ENABLE_PARTIAL_WRITE))) {
|
---|
595 | /*
|
---|
596 | * next chunk of data should get another prepended empty fragment
|
---|
597 | * in ciphersuites with known-IV weakness:
|
---|
598 | */
|
---|
599 | s->s3->empty_fragment_done = 0;
|
---|
600 |
|
---|
601 | if ((i == (int)n) && s->mode & SSL_MODE_RELEASE_BUFFERS &&
|
---|
602 | !SSL_IS_DTLS(s))
|
---|
603 | ssl3_release_write_buffer(s);
|
---|
604 |
|
---|
605 | return tot + i;
|
---|
606 | }
|
---|
607 |
|
---|
608 | n -= i;
|
---|
609 | tot += i;
|
---|
610 | }
|
---|
611 | }
|
---|
612 |
|
---|
613 | int do_ssl3_write(SSL *s, int type, const unsigned char *buf,
|
---|
614 | unsigned int *pipelens, unsigned int numpipes,
|
---|
615 | int create_empty_fragment)
|
---|
616 | {
|
---|
617 | unsigned char *outbuf[SSL_MAX_PIPELINES], *plen[SSL_MAX_PIPELINES];
|
---|
618 | SSL3_RECORD wr[SSL_MAX_PIPELINES];
|
---|
619 | int i, mac_size, clear = 0;
|
---|
620 | int prefix_len = 0;
|
---|
621 | int eivlen;
|
---|
622 | size_t align = 0;
|
---|
623 | SSL3_BUFFER *wb;
|
---|
624 | SSL_SESSION *sess;
|
---|
625 | unsigned int totlen = 0;
|
---|
626 | unsigned int j;
|
---|
627 |
|
---|
628 | for (j = 0; j < numpipes; j++)
|
---|
629 | totlen += pipelens[j];
|
---|
630 | /*
|
---|
631 | * first check if there is a SSL3_BUFFER still being written out. This
|
---|
632 | * will happen with non blocking IO
|
---|
633 | */
|
---|
634 | if (RECORD_LAYER_write_pending(&s->rlayer))
|
---|
635 | return (ssl3_write_pending(s, type, buf, totlen));
|
---|
636 |
|
---|
637 | /* If we have an alert to send, lets send it */
|
---|
638 | if (s->s3->alert_dispatch) {
|
---|
639 | i = s->method->ssl_dispatch_alert(s);
|
---|
640 | if (i <= 0)
|
---|
641 | return (i);
|
---|
642 | /* if it went, fall through and send more stuff */
|
---|
643 | }
|
---|
644 |
|
---|
645 | if (s->rlayer.numwpipes < numpipes)
|
---|
646 | if (!ssl3_setup_write_buffer(s, numpipes, 0))
|
---|
647 | return -1;
|
---|
648 |
|
---|
649 | if (totlen == 0 && !create_empty_fragment)
|
---|
650 | return 0;
|
---|
651 |
|
---|
652 | sess = s->session;
|
---|
653 |
|
---|
654 | if ((sess == NULL) ||
|
---|
655 | (s->enc_write_ctx == NULL) || (EVP_MD_CTX_md(s->write_hash) == NULL)) {
|
---|
656 | clear = s->enc_write_ctx ? 0 : 1; /* must be AEAD cipher */
|
---|
657 | mac_size = 0;
|
---|
658 | } else {
|
---|
659 | mac_size = EVP_MD_CTX_size(s->write_hash);
|
---|
660 | if (mac_size < 0)
|
---|
661 | goto err;
|
---|
662 | }
|
---|
663 |
|
---|
664 | /*
|
---|
665 | * 'create_empty_fragment' is true only when this function calls itself
|
---|
666 | */
|
---|
667 | if (!clear && !create_empty_fragment && !s->s3->empty_fragment_done) {
|
---|
668 | /*
|
---|
669 | * countermeasure against known-IV weakness in CBC ciphersuites (see
|
---|
670 | * http://www.openssl.org/~bodo/tls-cbc.txt)
|
---|
671 | */
|
---|
672 |
|
---|
673 | if (s->s3->need_empty_fragments && type == SSL3_RT_APPLICATION_DATA) {
|
---|
674 | /*
|
---|
675 | * recursive function call with 'create_empty_fragment' set; this
|
---|
676 | * prepares and buffers the data for an empty fragment (these
|
---|
677 | * 'prefix_len' bytes are sent out later together with the actual
|
---|
678 | * payload)
|
---|
679 | */
|
---|
680 | unsigned int tmppipelen = 0;
|
---|
681 |
|
---|
682 | prefix_len = do_ssl3_write(s, type, buf, &tmppipelen, 1, 1);
|
---|
683 | if (prefix_len <= 0)
|
---|
684 | goto err;
|
---|
685 |
|
---|
686 | if (prefix_len >
|
---|
687 | (SSL3_RT_HEADER_LENGTH + SSL3_RT_SEND_MAX_ENCRYPTED_OVERHEAD)) {
|
---|
688 | /* insufficient space */
|
---|
689 | SSLerr(SSL_F_DO_SSL3_WRITE, ERR_R_INTERNAL_ERROR);
|
---|
690 | goto err;
|
---|
691 | }
|
---|
692 | }
|
---|
693 |
|
---|
694 | s->s3->empty_fragment_done = 1;
|
---|
695 | }
|
---|
696 |
|
---|
697 | if (create_empty_fragment) {
|
---|
698 | wb = &s->rlayer.wbuf[0];
|
---|
699 | #if defined(SSL3_ALIGN_PAYLOAD) && SSL3_ALIGN_PAYLOAD!=0
|
---|
700 | /*
|
---|
701 | * extra fragment would be couple of cipher blocks, which would be
|
---|
702 | * multiple of SSL3_ALIGN_PAYLOAD, so if we want to align the real
|
---|
703 | * payload, then we can just pretend we simply have two headers.
|
---|
704 | */
|
---|
705 | align = (size_t)SSL3_BUFFER_get_buf(wb) + 2 * SSL3_RT_HEADER_LENGTH;
|
---|
706 | align = SSL3_ALIGN_PAYLOAD - 1 - ((align - 1) % SSL3_ALIGN_PAYLOAD);
|
---|
707 | #endif
|
---|
708 | outbuf[0] = SSL3_BUFFER_get_buf(wb) + align;
|
---|
709 | SSL3_BUFFER_set_offset(wb, align);
|
---|
710 | } else if (prefix_len) {
|
---|
711 | wb = &s->rlayer.wbuf[0];
|
---|
712 | outbuf[0] = SSL3_BUFFER_get_buf(wb) + SSL3_BUFFER_get_offset(wb)
|
---|
713 | + prefix_len;
|
---|
714 | } else {
|
---|
715 | for (j = 0; j < numpipes; j++) {
|
---|
716 | wb = &s->rlayer.wbuf[j];
|
---|
717 | #if defined(SSL3_ALIGN_PAYLOAD) && SSL3_ALIGN_PAYLOAD!=0
|
---|
718 | align = (size_t)SSL3_BUFFER_get_buf(wb) + SSL3_RT_HEADER_LENGTH;
|
---|
719 | align = SSL3_ALIGN_PAYLOAD - 1 - ((align - 1) % SSL3_ALIGN_PAYLOAD);
|
---|
720 | #endif
|
---|
721 | outbuf[j] = SSL3_BUFFER_get_buf(wb) + align;
|
---|
722 | SSL3_BUFFER_set_offset(wb, align);
|
---|
723 | }
|
---|
724 | }
|
---|
725 |
|
---|
726 | /* Explicit IV length, block ciphers appropriate version flag */
|
---|
727 | if (s->enc_write_ctx && SSL_USE_EXPLICIT_IV(s)) {
|
---|
728 | int mode = EVP_CIPHER_CTX_mode(s->enc_write_ctx);
|
---|
729 | if (mode == EVP_CIPH_CBC_MODE) {
|
---|
730 | eivlen = EVP_CIPHER_CTX_iv_length(s->enc_write_ctx);
|
---|
731 | if (eivlen <= 1)
|
---|
732 | eivlen = 0;
|
---|
733 | }
|
---|
734 | /* Need explicit part of IV for GCM mode */
|
---|
735 | else if (mode == EVP_CIPH_GCM_MODE)
|
---|
736 | eivlen = EVP_GCM_TLS_EXPLICIT_IV_LEN;
|
---|
737 | else if (mode == EVP_CIPH_CCM_MODE)
|
---|
738 | eivlen = EVP_CCM_TLS_EXPLICIT_IV_LEN;
|
---|
739 | else
|
---|
740 | eivlen = 0;
|
---|
741 | } else
|
---|
742 | eivlen = 0;
|
---|
743 |
|
---|
744 | totlen = 0;
|
---|
745 | /* Clear our SSL3_RECORD structures */
|
---|
746 | memset(wr, 0, sizeof wr);
|
---|
747 | for (j = 0; j < numpipes; j++) {
|
---|
748 | /* write the header */
|
---|
749 | *(outbuf[j]++) = type & 0xff;
|
---|
750 | SSL3_RECORD_set_type(&wr[j], type);
|
---|
751 |
|
---|
752 | *(outbuf[j]++) = (s->version >> 8);
|
---|
753 | /*
|
---|
754 | * Some servers hang if initial client hello is larger than 256 bytes
|
---|
755 | * and record version number > TLS 1.0
|
---|
756 | */
|
---|
757 | if (SSL_get_state(s) == TLS_ST_CW_CLNT_HELLO
|
---|
758 | && !s->renegotiate && TLS1_get_version(s) > TLS1_VERSION)
|
---|
759 | *(outbuf[j]++) = 0x1;
|
---|
760 | else
|
---|
761 | *(outbuf[j]++) = s->version & 0xff;
|
---|
762 |
|
---|
763 | /* field where we are to write out packet length */
|
---|
764 | plen[j] = outbuf[j];
|
---|
765 | outbuf[j] += 2;
|
---|
766 |
|
---|
767 | /* lets setup the record stuff. */
|
---|
768 | SSL3_RECORD_set_data(&wr[j], outbuf[j] + eivlen);
|
---|
769 | SSL3_RECORD_set_length(&wr[j], (int)pipelens[j]);
|
---|
770 | SSL3_RECORD_set_input(&wr[j], (unsigned char *)&buf[totlen]);
|
---|
771 | totlen += pipelens[j];
|
---|
772 |
|
---|
773 | /*
|
---|
774 | * we now 'read' from wr->input, wr->length bytes into wr->data
|
---|
775 | */
|
---|
776 |
|
---|
777 | /* first we compress */
|
---|
778 | if (s->compress != NULL) {
|
---|
779 | if (!ssl3_do_compress(s, &wr[j])) {
|
---|
780 | SSLerr(SSL_F_DO_SSL3_WRITE, SSL_R_COMPRESSION_FAILURE);
|
---|
781 | goto err;
|
---|
782 | }
|
---|
783 | } else {
|
---|
784 | memcpy(wr[j].data, wr[j].input, wr[j].length);
|
---|
785 | SSL3_RECORD_reset_input(&wr[j]);
|
---|
786 | }
|
---|
787 |
|
---|
788 | /*
|
---|
789 | * we should still have the output to wr->data and the input from
|
---|
790 | * wr->input. Length should be wr->length. wr->data still points in the
|
---|
791 | * wb->buf
|
---|
792 | */
|
---|
793 |
|
---|
794 | if (!SSL_WRITE_ETM(s) && mac_size != 0) {
|
---|
795 | if (s->method->ssl3_enc->mac(s, &wr[j],
|
---|
796 | &(outbuf[j][wr[j].length + eivlen]),
|
---|
797 | 1) < 0)
|
---|
798 | goto err;
|
---|
799 | SSL3_RECORD_add_length(&wr[j], mac_size);
|
---|
800 | }
|
---|
801 |
|
---|
802 | SSL3_RECORD_set_data(&wr[j], outbuf[j]);
|
---|
803 | SSL3_RECORD_reset_input(&wr[j]);
|
---|
804 |
|
---|
805 | if (eivlen) {
|
---|
806 | /*
|
---|
807 | * if (RAND_pseudo_bytes(p, eivlen) <= 0) goto err;
|
---|
808 | */
|
---|
809 | SSL3_RECORD_add_length(&wr[j], eivlen);
|
---|
810 | }
|
---|
811 | }
|
---|
812 |
|
---|
813 | if (s->method->ssl3_enc->enc(s, wr, numpipes, 1) < 1)
|
---|
814 | goto err;
|
---|
815 |
|
---|
816 | for (j = 0; j < numpipes; j++) {
|
---|
817 | if (SSL_WRITE_ETM(s) && mac_size != 0) {
|
---|
818 | if (s->method->ssl3_enc->mac(s, &wr[j],
|
---|
819 | outbuf[j] + wr[j].length, 1) < 0)
|
---|
820 | goto err;
|
---|
821 | SSL3_RECORD_add_length(&wr[j], mac_size);
|
---|
822 | }
|
---|
823 |
|
---|
824 | /* record length after mac and block padding */
|
---|
825 | s2n(SSL3_RECORD_get_length(&wr[j]), plen[j]);
|
---|
826 |
|
---|
827 | if (s->msg_callback)
|
---|
828 | s->msg_callback(1, 0, SSL3_RT_HEADER, plen[j] - 5, 5, s,
|
---|
829 | s->msg_callback_arg);
|
---|
830 |
|
---|
831 | /*
|
---|
832 | * we should now have wr->data pointing to the encrypted data, which is
|
---|
833 | * wr->length long
|
---|
834 | */
|
---|
835 | SSL3_RECORD_set_type(&wr[j], type); /* not needed but helps for
|
---|
836 | * debugging */
|
---|
837 | SSL3_RECORD_add_length(&wr[j], SSL3_RT_HEADER_LENGTH);
|
---|
838 |
|
---|
839 | if (create_empty_fragment) {
|
---|
840 | /*
|
---|
841 | * we are in a recursive call; just return the length, don't write
|
---|
842 | * out anything here
|
---|
843 | */
|
---|
844 | if (j > 0) {
|
---|
845 | /* We should never be pipelining an empty fragment!! */
|
---|
846 | SSLerr(SSL_F_DO_SSL3_WRITE, ERR_R_INTERNAL_ERROR);
|
---|
847 | goto err;
|
---|
848 | }
|
---|
849 | return SSL3_RECORD_get_length(wr);
|
---|
850 | }
|
---|
851 |
|
---|
852 | /* now let's set up wb */
|
---|
853 | SSL3_BUFFER_set_left(&s->rlayer.wbuf[j],
|
---|
854 | prefix_len + SSL3_RECORD_get_length(&wr[j]));
|
---|
855 | }
|
---|
856 |
|
---|
857 | /*
|
---|
858 | * memorize arguments so that ssl3_write_pending can detect bad write
|
---|
859 | * retries later
|
---|
860 | */
|
---|
861 | s->rlayer.wpend_tot = totlen;
|
---|
862 | s->rlayer.wpend_buf = buf;
|
---|
863 | s->rlayer.wpend_type = type;
|
---|
864 | s->rlayer.wpend_ret = totlen;
|
---|
865 |
|
---|
866 | /* we now just need to write the buffer */
|
---|
867 | return ssl3_write_pending(s, type, buf, totlen);
|
---|
868 | err:
|
---|
869 | return -1;
|
---|
870 | }
|
---|
871 |
|
---|
872 | /* if s->s3->wbuf.left != 0, we need to call this
|
---|
873 | *
|
---|
874 | * Return values are as per SSL_write()
|
---|
875 | */
|
---|
876 | int ssl3_write_pending(SSL *s, int type, const unsigned char *buf,
|
---|
877 | unsigned int len)
|
---|
878 | {
|
---|
879 | int i;
|
---|
880 | SSL3_BUFFER *wb = s->rlayer.wbuf;
|
---|
881 | unsigned int currbuf = 0;
|
---|
882 |
|
---|
883 | /* XXXX */
|
---|
884 | if ((s->rlayer.wpend_tot > (int)len)
|
---|
885 | || ((s->rlayer.wpend_buf != buf) &&
|
---|
886 | !(s->mode & SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER))
|
---|
887 | || (s->rlayer.wpend_type != type)) {
|
---|
888 | SSLerr(SSL_F_SSL3_WRITE_PENDING, SSL_R_BAD_WRITE_RETRY);
|
---|
889 | return (-1);
|
---|
890 | }
|
---|
891 |
|
---|
892 | for (;;) {
|
---|
893 | /* Loop until we find a buffer we haven't written out yet */
|
---|
894 | if (SSL3_BUFFER_get_left(&wb[currbuf]) == 0
|
---|
895 | && currbuf < s->rlayer.numwpipes - 1) {
|
---|
896 | currbuf++;
|
---|
897 | continue;
|
---|
898 | }
|
---|
899 | clear_sys_error();
|
---|
900 | if (s->wbio != NULL) {
|
---|
901 | s->rwstate = SSL_WRITING;
|
---|
902 | i = BIO_write(s->wbio, (char *)
|
---|
903 | &(SSL3_BUFFER_get_buf(&wb[currbuf])
|
---|
904 | [SSL3_BUFFER_get_offset(&wb[currbuf])]),
|
---|
905 | (unsigned int)SSL3_BUFFER_get_left(&wb[currbuf]));
|
---|
906 | } else {
|
---|
907 | SSLerr(SSL_F_SSL3_WRITE_PENDING, SSL_R_BIO_NOT_SET);
|
---|
908 | i = -1;
|
---|
909 | }
|
---|
910 | if (i == SSL3_BUFFER_get_left(&wb[currbuf])) {
|
---|
911 | SSL3_BUFFER_set_left(&wb[currbuf], 0);
|
---|
912 | SSL3_BUFFER_add_offset(&wb[currbuf], i);
|
---|
913 | if (currbuf + 1 < s->rlayer.numwpipes)
|
---|
914 | continue;
|
---|
915 | s->rwstate = SSL_NOTHING;
|
---|
916 | return (s->rlayer.wpend_ret);
|
---|
917 | } else if (i <= 0) {
|
---|
918 | if (SSL_IS_DTLS(s)) {
|
---|
919 | /*
|
---|
920 | * For DTLS, just drop it. That's kind of the whole point in
|
---|
921 | * using a datagram service
|
---|
922 | */
|
---|
923 | SSL3_BUFFER_set_left(&wb[currbuf], 0);
|
---|
924 | }
|
---|
925 | return i;
|
---|
926 | }
|
---|
927 | SSL3_BUFFER_add_offset(&wb[currbuf], i);
|
---|
928 | SSL3_BUFFER_add_left(&wb[currbuf], -i);
|
---|
929 | }
|
---|
930 | }
|
---|
931 |
|
---|
932 | /*-
|
---|
933 | * Return up to 'len' payload bytes received in 'type' records.
|
---|
934 | * 'type' is one of the following:
|
---|
935 | *
|
---|
936 | * - SSL3_RT_HANDSHAKE (when ssl3_get_message calls us)
|
---|
937 | * - SSL3_RT_APPLICATION_DATA (when ssl3_read calls us)
|
---|
938 | * - 0 (during a shutdown, no data has to be returned)
|
---|
939 | *
|
---|
940 | * If we don't have stored data to work from, read a SSL/TLS record first
|
---|
941 | * (possibly multiple records if we still don't have anything to return).
|
---|
942 | *
|
---|
943 | * This function must handle any surprises the peer may have for us, such as
|
---|
944 | * Alert records (e.g. close_notify) or renegotiation requests. ChangeCipherSpec
|
---|
945 | * messages are treated as if they were handshake messages *if* the |recd_type|
|
---|
946 | * argument is non NULL.
|
---|
947 | * Also if record payloads contain fragments too small to process, we store
|
---|
948 | * them until there is enough for the respective protocol (the record protocol
|
---|
949 | * may use arbitrary fragmentation and even interleaving):
|
---|
950 | * Change cipher spec protocol
|
---|
951 | * just 1 byte needed, no need for keeping anything stored
|
---|
952 | * Alert protocol
|
---|
953 | * 2 bytes needed (AlertLevel, AlertDescription)
|
---|
954 | * Handshake protocol
|
---|
955 | * 4 bytes needed (HandshakeType, uint24 length) -- we just have
|
---|
956 | * to detect unexpected Client Hello and Hello Request messages
|
---|
957 | * here, anything else is handled by higher layers
|
---|
958 | * Application data protocol
|
---|
959 | * none of our business
|
---|
960 | */
|
---|
961 | int ssl3_read_bytes(SSL *s, int type, int *recvd_type, unsigned char *buf,
|
---|
962 | int len, int peek)
|
---|
963 | {
|
---|
964 | int al, i, j, ret;
|
---|
965 | unsigned int n, curr_rec, num_recs, read_bytes;
|
---|
966 | SSL3_RECORD *rr;
|
---|
967 | SSL3_BUFFER *rbuf;
|
---|
968 | void (*cb) (const SSL *ssl, int type2, int val) = NULL;
|
---|
969 |
|
---|
970 | rbuf = &s->rlayer.rbuf;
|
---|
971 |
|
---|
972 | if (!SSL3_BUFFER_is_initialised(rbuf)) {
|
---|
973 | /* Not initialized yet */
|
---|
974 | if (!ssl3_setup_read_buffer(s))
|
---|
975 | return (-1);
|
---|
976 | }
|
---|
977 |
|
---|
978 | if ((type && (type != SSL3_RT_APPLICATION_DATA)
|
---|
979 | && (type != SSL3_RT_HANDSHAKE)) || (peek
|
---|
980 | && (type !=
|
---|
981 | SSL3_RT_APPLICATION_DATA))) {
|
---|
982 | SSLerr(SSL_F_SSL3_READ_BYTES, ERR_R_INTERNAL_ERROR);
|
---|
983 | return -1;
|
---|
984 | }
|
---|
985 |
|
---|
986 | if ((type == SSL3_RT_HANDSHAKE) && (s->rlayer.handshake_fragment_len > 0))
|
---|
987 | /* (partially) satisfy request from storage */
|
---|
988 | {
|
---|
989 | unsigned char *src = s->rlayer.handshake_fragment;
|
---|
990 | unsigned char *dst = buf;
|
---|
991 | unsigned int k;
|
---|
992 |
|
---|
993 | /* peek == 0 */
|
---|
994 | n = 0;
|
---|
995 | while ((len > 0) && (s->rlayer.handshake_fragment_len > 0)) {
|
---|
996 | *dst++ = *src++;
|
---|
997 | len--;
|
---|
998 | s->rlayer.handshake_fragment_len--;
|
---|
999 | n++;
|
---|
1000 | }
|
---|
1001 | /* move any remaining fragment bytes: */
|
---|
1002 | for (k = 0; k < s->rlayer.handshake_fragment_len; k++)
|
---|
1003 | s->rlayer.handshake_fragment[k] = *src++;
|
---|
1004 |
|
---|
1005 | if (recvd_type != NULL)
|
---|
1006 | *recvd_type = SSL3_RT_HANDSHAKE;
|
---|
1007 |
|
---|
1008 | return n;
|
---|
1009 | }
|
---|
1010 |
|
---|
1011 | /*
|
---|
1012 | * Now s->rlayer.handshake_fragment_len == 0 if type == SSL3_RT_HANDSHAKE.
|
---|
1013 | */
|
---|
1014 |
|
---|
1015 | if (!ossl_statem_get_in_handshake(s) && SSL_in_init(s)) {
|
---|
1016 | /* type == SSL3_RT_APPLICATION_DATA */
|
---|
1017 | i = s->handshake_func(s);
|
---|
1018 | if (i < 0)
|
---|
1019 | return (i);
|
---|
1020 | if (i == 0) {
|
---|
1021 | SSLerr(SSL_F_SSL3_READ_BYTES, SSL_R_SSL_HANDSHAKE_FAILURE);
|
---|
1022 | return (-1);
|
---|
1023 | }
|
---|
1024 | }
|
---|
1025 | start:
|
---|
1026 | s->rwstate = SSL_NOTHING;
|
---|
1027 |
|
---|
1028 | /*-
|
---|
1029 | * For each record 'i' up to |num_recs]
|
---|
1030 | * rr[i].type - is the type of record
|
---|
1031 | * rr[i].data, - data
|
---|
1032 | * rr[i].off, - offset into 'data' for next read
|
---|
1033 | * rr[i].length, - number of bytes.
|
---|
1034 | */
|
---|
1035 | rr = s->rlayer.rrec;
|
---|
1036 | num_recs = RECORD_LAYER_get_numrpipes(&s->rlayer);
|
---|
1037 |
|
---|
1038 | do {
|
---|
1039 | /* get new records if necessary */
|
---|
1040 | if (num_recs == 0) {
|
---|
1041 | ret = ssl3_get_record(s);
|
---|
1042 | if (ret <= 0)
|
---|
1043 | return (ret);
|
---|
1044 | num_recs = RECORD_LAYER_get_numrpipes(&s->rlayer);
|
---|
1045 | if (num_recs == 0) {
|
---|
1046 | /* Shouldn't happen */
|
---|
1047 | al = SSL_AD_INTERNAL_ERROR;
|
---|
1048 | SSLerr(SSL_F_SSL3_READ_BYTES, ERR_R_INTERNAL_ERROR);
|
---|
1049 | goto f_err;
|
---|
1050 | }
|
---|
1051 | }
|
---|
1052 | /* Skip over any records we have already read */
|
---|
1053 | for (curr_rec = 0;
|
---|
1054 | curr_rec < num_recs && SSL3_RECORD_is_read(&rr[curr_rec]);
|
---|
1055 | curr_rec++) ;
|
---|
1056 | if (curr_rec == num_recs) {
|
---|
1057 | RECORD_LAYER_set_numrpipes(&s->rlayer, 0);
|
---|
1058 | num_recs = 0;
|
---|
1059 | curr_rec = 0;
|
---|
1060 | }
|
---|
1061 | } while (num_recs == 0);
|
---|
1062 | rr = &rr[curr_rec];
|
---|
1063 |
|
---|
1064 | /*
|
---|
1065 | * Reset the count of consecutive warning alerts if we've got a non-empty
|
---|
1066 | * record that isn't an alert.
|
---|
1067 | */
|
---|
1068 | if (SSL3_RECORD_get_type(rr) != SSL3_RT_ALERT
|
---|
1069 | && SSL3_RECORD_get_length(rr) != 0)
|
---|
1070 | s->rlayer.alert_count = 0;
|
---|
1071 |
|
---|
1072 | /* we now have a packet which can be read and processed */
|
---|
1073 |
|
---|
1074 | if (s->s3->change_cipher_spec /* set when we receive ChangeCipherSpec,
|
---|
1075 | * reset by ssl3_get_finished */
|
---|
1076 | && (SSL3_RECORD_get_type(rr) != SSL3_RT_HANDSHAKE)) {
|
---|
1077 | al = SSL_AD_UNEXPECTED_MESSAGE;
|
---|
1078 | SSLerr(SSL_F_SSL3_READ_BYTES, SSL_R_DATA_BETWEEN_CCS_AND_FINISHED);
|
---|
1079 | goto f_err;
|
---|
1080 | }
|
---|
1081 |
|
---|
1082 | /*
|
---|
1083 | * If the other end has shut down, throw anything we read away (even in
|
---|
1084 | * 'peek' mode)
|
---|
1085 | */
|
---|
1086 | if (s->shutdown & SSL_RECEIVED_SHUTDOWN) {
|
---|
1087 | SSL3_RECORD_set_length(rr, 0);
|
---|
1088 | s->rwstate = SSL_NOTHING;
|
---|
1089 | return (0);
|
---|
1090 | }
|
---|
1091 |
|
---|
1092 | if (type == SSL3_RECORD_get_type(rr)
|
---|
1093 | || (SSL3_RECORD_get_type(rr) == SSL3_RT_CHANGE_CIPHER_SPEC
|
---|
1094 | && type == SSL3_RT_HANDSHAKE && recvd_type != NULL)) {
|
---|
1095 | /*
|
---|
1096 | * SSL3_RT_APPLICATION_DATA or
|
---|
1097 | * SSL3_RT_HANDSHAKE or
|
---|
1098 | * SSL3_RT_CHANGE_CIPHER_SPEC
|
---|
1099 | */
|
---|
1100 | /*
|
---|
1101 | * make sure that we are not getting application data when we are
|
---|
1102 | * doing a handshake for the first time
|
---|
1103 | */
|
---|
1104 | if (SSL_in_init(s) && (type == SSL3_RT_APPLICATION_DATA) &&
|
---|
1105 | (s->enc_read_ctx == NULL)) {
|
---|
1106 | al = SSL_AD_UNEXPECTED_MESSAGE;
|
---|
1107 | SSLerr(SSL_F_SSL3_READ_BYTES, SSL_R_APP_DATA_IN_HANDSHAKE);
|
---|
1108 | goto f_err;
|
---|
1109 | }
|
---|
1110 |
|
---|
1111 | if (type == SSL3_RT_HANDSHAKE
|
---|
1112 | && SSL3_RECORD_get_type(rr) == SSL3_RT_CHANGE_CIPHER_SPEC
|
---|
1113 | && s->rlayer.handshake_fragment_len > 0) {
|
---|
1114 | al = SSL_AD_UNEXPECTED_MESSAGE;
|
---|
1115 | SSLerr(SSL_F_SSL3_READ_BYTES, SSL_R_CCS_RECEIVED_EARLY);
|
---|
1116 | goto f_err;
|
---|
1117 | }
|
---|
1118 |
|
---|
1119 | if (recvd_type != NULL)
|
---|
1120 | *recvd_type = SSL3_RECORD_get_type(rr);
|
---|
1121 |
|
---|
1122 | if (len <= 0)
|
---|
1123 | return (len);
|
---|
1124 |
|
---|
1125 | read_bytes = 0;
|
---|
1126 | do {
|
---|
1127 | if ((unsigned int)len - read_bytes > SSL3_RECORD_get_length(rr))
|
---|
1128 | n = SSL3_RECORD_get_length(rr);
|
---|
1129 | else
|
---|
1130 | n = (unsigned int)len - read_bytes;
|
---|
1131 |
|
---|
1132 | memcpy(buf, &(rr->data[rr->off]), n);
|
---|
1133 | buf += n;
|
---|
1134 | if (peek) {
|
---|
1135 | /* Mark any zero length record as consumed CVE-2016-6305 */
|
---|
1136 | if (SSL3_RECORD_get_length(rr) == 0)
|
---|
1137 | SSL3_RECORD_set_read(rr);
|
---|
1138 | } else {
|
---|
1139 | SSL3_RECORD_sub_length(rr, n);
|
---|
1140 | SSL3_RECORD_add_off(rr, n);
|
---|
1141 | if (SSL3_RECORD_get_length(rr) == 0) {
|
---|
1142 | s->rlayer.rstate = SSL_ST_READ_HEADER;
|
---|
1143 | SSL3_RECORD_set_off(rr, 0);
|
---|
1144 | SSL3_RECORD_set_read(rr);
|
---|
1145 | }
|
---|
1146 | }
|
---|
1147 | if (SSL3_RECORD_get_length(rr) == 0
|
---|
1148 | || (peek && n == SSL3_RECORD_get_length(rr))) {
|
---|
1149 | curr_rec++;
|
---|
1150 | rr++;
|
---|
1151 | }
|
---|
1152 | read_bytes += n;
|
---|
1153 | } while (type == SSL3_RT_APPLICATION_DATA && curr_rec < num_recs
|
---|
1154 | && read_bytes < (unsigned int)len);
|
---|
1155 | if (read_bytes == 0) {
|
---|
1156 | /* We must have read empty records. Get more data */
|
---|
1157 | goto start;
|
---|
1158 | }
|
---|
1159 | if (!peek && curr_rec == num_recs
|
---|
1160 | && (s->mode & SSL_MODE_RELEASE_BUFFERS)
|
---|
1161 | && SSL3_BUFFER_get_left(rbuf) == 0)
|
---|
1162 | ssl3_release_read_buffer(s);
|
---|
1163 | return read_bytes;
|
---|
1164 | }
|
---|
1165 |
|
---|
1166 | /*
|
---|
1167 | * If we get here, then type != rr->type; if we have a handshake message,
|
---|
1168 | * then it was unexpected (Hello Request or Client Hello) or invalid (we
|
---|
1169 | * were actually expecting a CCS).
|
---|
1170 | */
|
---|
1171 |
|
---|
1172 | /*
|
---|
1173 | * Lets just double check that we've not got an SSLv2 record
|
---|
1174 | */
|
---|
1175 | if (rr->rec_version == SSL2_VERSION) {
|
---|
1176 | /*
|
---|
1177 | * Should never happen. ssl3_get_record() should only give us an SSLv2
|
---|
1178 | * record back if this is the first packet and we are looking for an
|
---|
1179 | * initial ClientHello. Therefore |type| should always be equal to
|
---|
1180 | * |rr->type|. If not then something has gone horribly wrong
|
---|
1181 | */
|
---|
1182 | al = SSL_AD_INTERNAL_ERROR;
|
---|
1183 | SSLerr(SSL_F_SSL3_READ_BYTES, ERR_R_INTERNAL_ERROR);
|
---|
1184 | goto f_err;
|
---|
1185 | }
|
---|
1186 |
|
---|
1187 | if (s->method->version == TLS_ANY_VERSION
|
---|
1188 | && (s->server || rr->type != SSL3_RT_ALERT)) {
|
---|
1189 | /*
|
---|
1190 | * If we've got this far and still haven't decided on what version
|
---|
1191 | * we're using then this must be a client side alert we're dealing with
|
---|
1192 | * (we don't allow heartbeats yet). We shouldn't be receiving anything
|
---|
1193 | * other than a ClientHello if we are a server.
|
---|
1194 | */
|
---|
1195 | s->version = rr->rec_version;
|
---|
1196 | al = SSL_AD_UNEXPECTED_MESSAGE;
|
---|
1197 | SSLerr(SSL_F_SSL3_READ_BYTES, SSL_R_UNEXPECTED_MESSAGE);
|
---|
1198 | goto f_err;
|
---|
1199 | }
|
---|
1200 |
|
---|
1201 | /*
|
---|
1202 | * In case of record types for which we have 'fragment' storage, fill
|
---|
1203 | * that so that we can process the data at a fixed place.
|
---|
1204 | */
|
---|
1205 | {
|
---|
1206 | unsigned int dest_maxlen = 0;
|
---|
1207 | unsigned char *dest = NULL;
|
---|
1208 | unsigned int *dest_len = NULL;
|
---|
1209 |
|
---|
1210 | if (SSL3_RECORD_get_type(rr) == SSL3_RT_HANDSHAKE) {
|
---|
1211 | dest_maxlen = sizeof s->rlayer.handshake_fragment;
|
---|
1212 | dest = s->rlayer.handshake_fragment;
|
---|
1213 | dest_len = &s->rlayer.handshake_fragment_len;
|
---|
1214 | } else if (SSL3_RECORD_get_type(rr) == SSL3_RT_ALERT) {
|
---|
1215 | dest_maxlen = sizeof s->rlayer.alert_fragment;
|
---|
1216 | dest = s->rlayer.alert_fragment;
|
---|
1217 | dest_len = &s->rlayer.alert_fragment_len;
|
---|
1218 | }
|
---|
1219 |
|
---|
1220 | if (dest_maxlen > 0) {
|
---|
1221 | n = dest_maxlen - *dest_len; /* available space in 'dest' */
|
---|
1222 | if (SSL3_RECORD_get_length(rr) < n)
|
---|
1223 | n = SSL3_RECORD_get_length(rr); /* available bytes */
|
---|
1224 |
|
---|
1225 | /* now move 'n' bytes: */
|
---|
1226 | while (n-- > 0) {
|
---|
1227 | dest[(*dest_len)++] =
|
---|
1228 | SSL3_RECORD_get_data(rr)[SSL3_RECORD_get_off(rr)];
|
---|
1229 | SSL3_RECORD_add_off(rr, 1);
|
---|
1230 | SSL3_RECORD_add_length(rr, -1);
|
---|
1231 | }
|
---|
1232 |
|
---|
1233 | if (*dest_len < dest_maxlen) {
|
---|
1234 | SSL3_RECORD_set_read(rr);
|
---|
1235 | goto start; /* fragment was too small */
|
---|
1236 | }
|
---|
1237 | }
|
---|
1238 | }
|
---|
1239 |
|
---|
1240 | /*-
|
---|
1241 | * s->rlayer.handshake_fragment_len == 4 iff rr->type == SSL3_RT_HANDSHAKE;
|
---|
1242 | * s->rlayer.alert_fragment_len == 2 iff rr->type == SSL3_RT_ALERT.
|
---|
1243 | * (Possibly rr is 'empty' now, i.e. rr->length may be 0.)
|
---|
1244 | */
|
---|
1245 |
|
---|
1246 | /* If we are a client, check for an incoming 'Hello Request': */
|
---|
1247 | if ((!s->server) &&
|
---|
1248 | (s->rlayer.handshake_fragment_len >= 4) &&
|
---|
1249 | (s->rlayer.handshake_fragment[0] == SSL3_MT_HELLO_REQUEST) &&
|
---|
1250 | (s->session != NULL) && (s->session->cipher != NULL)) {
|
---|
1251 | s->rlayer.handshake_fragment_len = 0;
|
---|
1252 |
|
---|
1253 | if ((s->rlayer.handshake_fragment[1] != 0) ||
|
---|
1254 | (s->rlayer.handshake_fragment[2] != 0) ||
|
---|
1255 | (s->rlayer.handshake_fragment[3] != 0)) {
|
---|
1256 | al = SSL_AD_DECODE_ERROR;
|
---|
1257 | SSLerr(SSL_F_SSL3_READ_BYTES, SSL_R_BAD_HELLO_REQUEST);
|
---|
1258 | goto f_err;
|
---|
1259 | }
|
---|
1260 |
|
---|
1261 | if (s->msg_callback)
|
---|
1262 | s->msg_callback(0, s->version, SSL3_RT_HANDSHAKE,
|
---|
1263 | s->rlayer.handshake_fragment, 4, s,
|
---|
1264 | s->msg_callback_arg);
|
---|
1265 |
|
---|
1266 | if (SSL_is_init_finished(s) &&
|
---|
1267 | !(s->s3->flags & SSL3_FLAGS_NO_RENEGOTIATE_CIPHERS) &&
|
---|
1268 | !s->s3->renegotiate) {
|
---|
1269 | ssl3_renegotiate(s);
|
---|
1270 | if (ssl3_renegotiate_check(s)) {
|
---|
1271 | i = s->handshake_func(s);
|
---|
1272 | if (i < 0)
|
---|
1273 | return (i);
|
---|
1274 | if (i == 0) {
|
---|
1275 | SSLerr(SSL_F_SSL3_READ_BYTES, SSL_R_SSL_HANDSHAKE_FAILURE);
|
---|
1276 | return (-1);
|
---|
1277 | }
|
---|
1278 |
|
---|
1279 | if (!(s->mode & SSL_MODE_AUTO_RETRY)) {
|
---|
1280 | if (SSL3_BUFFER_get_left(rbuf) == 0) {
|
---|
1281 | /* no read-ahead left? */
|
---|
1282 | BIO *bio;
|
---|
1283 | /*
|
---|
1284 | * In the case where we try to read application data,
|
---|
1285 | * but we trigger an SSL handshake, we return -1 with
|
---|
1286 | * the retry option set. Otherwise renegotiation may
|
---|
1287 | * cause nasty problems in the blocking world
|
---|
1288 | */
|
---|
1289 | s->rwstate = SSL_READING;
|
---|
1290 | bio = SSL_get_rbio(s);
|
---|
1291 | BIO_clear_retry_flags(bio);
|
---|
1292 | BIO_set_retry_read(bio);
|
---|
1293 | return (-1);
|
---|
1294 | }
|
---|
1295 | }
|
---|
1296 | } else {
|
---|
1297 | SSL3_RECORD_set_read(rr);
|
---|
1298 | }
|
---|
1299 | } else {
|
---|
1300 | /* Does this ever happen? */
|
---|
1301 | SSL3_RECORD_set_read(rr);
|
---|
1302 | }
|
---|
1303 | /*
|
---|
1304 | * we either finished a handshake or ignored the request, now try
|
---|
1305 | * again to obtain the (application) data we were asked for
|
---|
1306 | */
|
---|
1307 | goto start;
|
---|
1308 | }
|
---|
1309 | /*
|
---|
1310 | * If we are a server and get a client hello when renegotiation isn't
|
---|
1311 | * allowed send back a no renegotiation alert and carry on. WARNING:
|
---|
1312 | * experimental code, needs reviewing (steve)
|
---|
1313 | */
|
---|
1314 | if (s->server &&
|
---|
1315 | SSL_is_init_finished(s) &&
|
---|
1316 | !s->s3->send_connection_binding &&
|
---|
1317 | (s->version > SSL3_VERSION) &&
|
---|
1318 | (s->rlayer.handshake_fragment_len >= 4) &&
|
---|
1319 | (s->rlayer.handshake_fragment[0] == SSL3_MT_CLIENT_HELLO) &&
|
---|
1320 | (s->session != NULL) && (s->session->cipher != NULL) &&
|
---|
1321 | !(s->ctx->options & SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION)) {
|
---|
1322 | SSL3_RECORD_set_length(rr, 0);
|
---|
1323 | SSL3_RECORD_set_read(rr);
|
---|
1324 | ssl3_send_alert(s, SSL3_AL_WARNING, SSL_AD_NO_RENEGOTIATION);
|
---|
1325 | goto start;
|
---|
1326 | }
|
---|
1327 | if (s->rlayer.alert_fragment_len >= 2) {
|
---|
1328 | int alert_level = s->rlayer.alert_fragment[0];
|
---|
1329 | int alert_descr = s->rlayer.alert_fragment[1];
|
---|
1330 |
|
---|
1331 | s->rlayer.alert_fragment_len = 0;
|
---|
1332 |
|
---|
1333 | if (s->msg_callback)
|
---|
1334 | s->msg_callback(0, s->version, SSL3_RT_ALERT,
|
---|
1335 | s->rlayer.alert_fragment, 2, s,
|
---|
1336 | s->msg_callback_arg);
|
---|
1337 |
|
---|
1338 | if (s->info_callback != NULL)
|
---|
1339 | cb = s->info_callback;
|
---|
1340 | else if (s->ctx->info_callback != NULL)
|
---|
1341 | cb = s->ctx->info_callback;
|
---|
1342 |
|
---|
1343 | if (cb != NULL) {
|
---|
1344 | j = (alert_level << 8) | alert_descr;
|
---|
1345 | cb(s, SSL_CB_READ_ALERT, j);
|
---|
1346 | }
|
---|
1347 |
|
---|
1348 | if (alert_level == SSL3_AL_WARNING) {
|
---|
1349 | s->s3->warn_alert = alert_descr;
|
---|
1350 | SSL3_RECORD_set_read(rr);
|
---|
1351 |
|
---|
1352 | s->rlayer.alert_count++;
|
---|
1353 | if (s->rlayer.alert_count == MAX_WARN_ALERT_COUNT) {
|
---|
1354 | al = SSL_AD_UNEXPECTED_MESSAGE;
|
---|
1355 | SSLerr(SSL_F_SSL3_READ_BYTES, SSL_R_TOO_MANY_WARN_ALERTS);
|
---|
1356 | goto f_err;
|
---|
1357 | }
|
---|
1358 |
|
---|
1359 | if (alert_descr == SSL_AD_CLOSE_NOTIFY) {
|
---|
1360 | s->shutdown |= SSL_RECEIVED_SHUTDOWN;
|
---|
1361 | return (0);
|
---|
1362 | }
|
---|
1363 | /*
|
---|
1364 | * This is a warning but we receive it if we requested
|
---|
1365 | * renegotiation and the peer denied it. Terminate with a fatal
|
---|
1366 | * alert because if application tried to renegotiate it
|
---|
1367 | * presumably had a good reason and expects it to succeed. In
|
---|
1368 | * future we might have a renegotiation where we don't care if
|
---|
1369 | * the peer refused it where we carry on.
|
---|
1370 | */
|
---|
1371 | else if (alert_descr == SSL_AD_NO_RENEGOTIATION) {
|
---|
1372 | al = SSL_AD_HANDSHAKE_FAILURE;
|
---|
1373 | SSLerr(SSL_F_SSL3_READ_BYTES, SSL_R_NO_RENEGOTIATION);
|
---|
1374 | goto f_err;
|
---|
1375 | }
|
---|
1376 | #ifdef SSL_AD_MISSING_SRP_USERNAME
|
---|
1377 | else if (alert_descr == SSL_AD_MISSING_SRP_USERNAME)
|
---|
1378 | return (0);
|
---|
1379 | #endif
|
---|
1380 | } else if (alert_level == SSL3_AL_FATAL) {
|
---|
1381 | char tmp[16];
|
---|
1382 |
|
---|
1383 | s->rwstate = SSL_NOTHING;
|
---|
1384 | s->s3->fatal_alert = alert_descr;
|
---|
1385 | SSLerr(SSL_F_SSL3_READ_BYTES, SSL_AD_REASON_OFFSET + alert_descr);
|
---|
1386 | BIO_snprintf(tmp, sizeof tmp, "%d", alert_descr);
|
---|
1387 | ERR_add_error_data(2, "SSL alert number ", tmp);
|
---|
1388 | s->shutdown |= SSL_RECEIVED_SHUTDOWN;
|
---|
1389 | SSL3_RECORD_set_read(rr);
|
---|
1390 | SSL_CTX_remove_session(s->session_ctx, s->session);
|
---|
1391 | return (0);
|
---|
1392 | } else {
|
---|
1393 | al = SSL_AD_ILLEGAL_PARAMETER;
|
---|
1394 | SSLerr(SSL_F_SSL3_READ_BYTES, SSL_R_UNKNOWN_ALERT_TYPE);
|
---|
1395 | goto f_err;
|
---|
1396 | }
|
---|
1397 |
|
---|
1398 | goto start;
|
---|
1399 | }
|
---|
1400 |
|
---|
1401 | if (s->shutdown & SSL_SENT_SHUTDOWN) { /* but we have not received a
|
---|
1402 | * shutdown */
|
---|
1403 | s->rwstate = SSL_NOTHING;
|
---|
1404 | SSL3_RECORD_set_length(rr, 0);
|
---|
1405 | SSL3_RECORD_set_read(rr);
|
---|
1406 | return (0);
|
---|
1407 | }
|
---|
1408 |
|
---|
1409 | if (SSL3_RECORD_get_type(rr) == SSL3_RT_CHANGE_CIPHER_SPEC) {
|
---|
1410 | al = SSL_AD_UNEXPECTED_MESSAGE;
|
---|
1411 | SSLerr(SSL_F_SSL3_READ_BYTES, SSL_R_CCS_RECEIVED_EARLY);
|
---|
1412 | goto f_err;
|
---|
1413 | }
|
---|
1414 |
|
---|
1415 | /*
|
---|
1416 | * Unexpected handshake message (Client Hello, or protocol violation)
|
---|
1417 | */
|
---|
1418 | if ((s->rlayer.handshake_fragment_len >= 4)
|
---|
1419 | && !ossl_statem_get_in_handshake(s)) {
|
---|
1420 | if (SSL_is_init_finished(s) &&
|
---|
1421 | !(s->s3->flags & SSL3_FLAGS_NO_RENEGOTIATE_CIPHERS)) {
|
---|
1422 | ossl_statem_set_in_init(s, 1);
|
---|
1423 | s->renegotiate = 1;
|
---|
1424 | s->new_session = 1;
|
---|
1425 | }
|
---|
1426 | i = s->handshake_func(s);
|
---|
1427 | if (i < 0)
|
---|
1428 | return (i);
|
---|
1429 | if (i == 0) {
|
---|
1430 | SSLerr(SSL_F_SSL3_READ_BYTES, SSL_R_SSL_HANDSHAKE_FAILURE);
|
---|
1431 | return (-1);
|
---|
1432 | }
|
---|
1433 |
|
---|
1434 | if (!(s->mode & SSL_MODE_AUTO_RETRY)) {
|
---|
1435 | if (SSL3_BUFFER_get_left(rbuf) == 0) {
|
---|
1436 | /* no read-ahead left? */
|
---|
1437 | BIO *bio;
|
---|
1438 | /*
|
---|
1439 | * In the case where we try to read application data, but we
|
---|
1440 | * trigger an SSL handshake, we return -1 with the retry
|
---|
1441 | * option set. Otherwise renegotiation may cause nasty
|
---|
1442 | * problems in the blocking world
|
---|
1443 | */
|
---|
1444 | s->rwstate = SSL_READING;
|
---|
1445 | bio = SSL_get_rbio(s);
|
---|
1446 | BIO_clear_retry_flags(bio);
|
---|
1447 | BIO_set_retry_read(bio);
|
---|
1448 | return (-1);
|
---|
1449 | }
|
---|
1450 | }
|
---|
1451 | goto start;
|
---|
1452 | }
|
---|
1453 |
|
---|
1454 | switch (SSL3_RECORD_get_type(rr)) {
|
---|
1455 | default:
|
---|
1456 | /*
|
---|
1457 | * TLS 1.0 and 1.1 say you SHOULD ignore unrecognised record types, but
|
---|
1458 | * TLS 1.2 says you MUST send an unexpected message alert. We use the
|
---|
1459 | * TLS 1.2 behaviour for all protocol versions to prevent issues where
|
---|
1460 | * no progress is being made and the peer continually sends unrecognised
|
---|
1461 | * record types, using up resources processing them.
|
---|
1462 | */
|
---|
1463 | al = SSL_AD_UNEXPECTED_MESSAGE;
|
---|
1464 | SSLerr(SSL_F_SSL3_READ_BYTES, SSL_R_UNEXPECTED_RECORD);
|
---|
1465 | goto f_err;
|
---|
1466 | case SSL3_RT_CHANGE_CIPHER_SPEC:
|
---|
1467 | case SSL3_RT_ALERT:
|
---|
1468 | case SSL3_RT_HANDSHAKE:
|
---|
1469 | /*
|
---|
1470 | * we already handled all of these, with the possible exception of
|
---|
1471 | * SSL3_RT_HANDSHAKE when ossl_statem_get_in_handshake(s) is true, but
|
---|
1472 | * that should not happen when type != rr->type
|
---|
1473 | */
|
---|
1474 | al = SSL_AD_UNEXPECTED_MESSAGE;
|
---|
1475 | SSLerr(SSL_F_SSL3_READ_BYTES, ERR_R_INTERNAL_ERROR);
|
---|
1476 | goto f_err;
|
---|
1477 | case SSL3_RT_APPLICATION_DATA:
|
---|
1478 | /*
|
---|
1479 | * At this point, we were expecting handshake data, but have
|
---|
1480 | * application data. If the library was running inside ssl3_read()
|
---|
1481 | * (i.e. in_read_app_data is set) and it makes sense to read
|
---|
1482 | * application data at this point (session renegotiation not yet
|
---|
1483 | * started), we will indulge it.
|
---|
1484 | */
|
---|
1485 | if (ossl_statem_app_data_allowed(s)) {
|
---|
1486 | s->s3->in_read_app_data = 2;
|
---|
1487 | return (-1);
|
---|
1488 | } else {
|
---|
1489 | al = SSL_AD_UNEXPECTED_MESSAGE;
|
---|
1490 | SSLerr(SSL_F_SSL3_READ_BYTES, SSL_R_UNEXPECTED_RECORD);
|
---|
1491 | goto f_err;
|
---|
1492 | }
|
---|
1493 | }
|
---|
1494 | /* not reached */
|
---|
1495 |
|
---|
1496 | f_err:
|
---|
1497 | ssl3_send_alert(s, SSL3_AL_FATAL, al);
|
---|
1498 | return (-1);
|
---|
1499 | }
|
---|
1500 |
|
---|
1501 | void ssl3_record_sequence_update(unsigned char *seq)
|
---|
1502 | {
|
---|
1503 | int i;
|
---|
1504 |
|
---|
1505 | for (i = 7; i >= 0; i--) {
|
---|
1506 | ++seq[i];
|
---|
1507 | if (seq[i] != 0)
|
---|
1508 | break;
|
---|
1509 | }
|
---|
1510 | }
|
---|
1511 |
|
---|
1512 | /*
|
---|
1513 | * Returns true if the current rrec was sent in SSLv2 backwards compatible
|
---|
1514 | * format and false otherwise.
|
---|
1515 | */
|
---|
1516 | int RECORD_LAYER_is_sslv2_record(RECORD_LAYER *rl)
|
---|
1517 | {
|
---|
1518 | return SSL3_RECORD_is_sslv2_record(&rl->rrec[0]);
|
---|
1519 | }
|
---|
1520 |
|
---|
1521 | /*
|
---|
1522 | * Returns the length in bytes of the current rrec
|
---|
1523 | */
|
---|
1524 | unsigned int RECORD_LAYER_get_rrec_length(RECORD_LAYER *rl)
|
---|
1525 | {
|
---|
1526 | return SSL3_RECORD_get_length(&rl->rrec[0]);
|
---|
1527 | }
|
---|