annotate common-kex.c @ 30:223b0f5f8dce

Switching to the magical new Makefile, and new dbmulti style
author Matt Johnston <matt@ucc.asn.au>
date Tue, 27 Jul 2004 14:44:43 +0000
parents 0969767bca0d
children f789045062e6
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4
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1 /*
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2 * Dropbear - a SSH2 server
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3 * SSH client implementation
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4 *
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5 * This code is copied from the larger file "kex.c"
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6 * some functions are verbatim, others are generalized --mihnea
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7 *
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8 * Copyright (c) 2002,2003 Matt Johnston
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9 * Portions Copyright (c) 2004 by Mihnea Stoenescu
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10 * All rights reserved.
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11 *
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12 * Permission is hereby granted, free of charge, to any person obtaining a copy
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13 * of this software and associated documentation files (the "Software"), to deal
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14 * in the Software without restriction, including without limitation the rights
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15 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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16 * copies of the Software, and to permit persons to whom the Software is
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17 * furnished to do so, subject to the following conditions:
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18 *
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19 * The above copyright notice and this permission notice shall be included in
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20 * all copies or substantial portions of the Software.
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21 *
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22 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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23 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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24 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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25 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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26 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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27 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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28 * SOFTWARE. */
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29
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30 #include "includes.h"
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31 #include "dbutil.h"
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32 #include "algo.h"
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33 #include "buffer.h"
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34 #include "session.h"
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35 #include "kex.h"
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36 #include "ssh.h"
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37 #include "packet.h"
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38 #include "bignum.h"
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39 #include "random.h"
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40
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41 /* diffie-hellman-group1-sha1 value for p */
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42 const unsigned char dh_p_val[] = {
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43 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xC9, 0x0F, 0xDA, 0xA2,
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44 0x21, 0x68, 0xC2, 0x34, 0xC4, 0xC6, 0x62, 0x8B, 0x80, 0xDC, 0x1C, 0xD1,
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45 0x29, 0x02, 0x4E, 0x08, 0x8A, 0x67, 0xCC, 0x74, 0x02, 0x0B, 0xBE, 0xA6,
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46 0x3B, 0x13, 0x9B, 0x22, 0x51, 0x4A, 0x08, 0x79, 0x8E, 0x34, 0x04, 0xDD,
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47 0xEF, 0x95, 0x19, 0xB3, 0xCD, 0x3A, 0x43, 0x1B, 0x30, 0x2B, 0x0A, 0x6D,
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48 0xF2, 0x5F, 0x14, 0x37, 0x4F, 0xE1, 0x35, 0x6D, 0x6D, 0x51, 0xC2, 0x45,
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49 0xE4, 0x85, 0xB5, 0x76, 0x62, 0x5E, 0x7E, 0xC6, 0xF4, 0x4C, 0x42, 0xE9,
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50 0xA6, 0x37, 0xED, 0x6B, 0x0B, 0xFF, 0x5C, 0xB6, 0xF4, 0x06, 0xB7, 0xED,
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51 0xEE, 0x38, 0x6B, 0xFB, 0x5A, 0x89, 0x9F, 0xA5, 0xAE, 0x9F, 0x24, 0x11,
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52 0x7C, 0x4B, 0x1F, 0xE6, 0x49, 0x28, 0x66, 0x51, 0xEC, 0xE6, 0x53, 0x81,
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53 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF};
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54
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55 const int DH_G_VAL = 2;
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56
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57 static void gen_new_keys();
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58 #ifndef DISABLE_ZLIB
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59 static void gen_new_zstreams();
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60 #endif
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61 /* helper function for gen_new_keys */
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62 static void hashkeys(unsigned char *out, int outlen,
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63 const hash_state * hs, unsigned const char X);
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64
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65
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66 /* Send our list of algorithms we can use */
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67 void send_msg_kexinit() {
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68
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69 CHECKCLEARTOWRITE();
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70 buf_putbyte(ses.writepayload, SSH_MSG_KEXINIT);
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71
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72 /* cookie */
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73 genrandom(buf_getwriteptr(ses.writepayload, 16), 16);
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74 buf_incrwritepos(ses.writepayload, 16);
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75
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76 /* kex algos */
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77 buf_put_algolist(ses.writepayload, sshkex);
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78
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79 /* server_host_key_algorithms */
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80 buf_put_algolist(ses.writepayload, sshhostkey);
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81
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82 /* encryption_algorithms_client_to_server */
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83 buf_put_algolist(ses.writepayload, sshciphers);
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84
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85 /* encryption_algorithms_server_to_client */
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86 buf_put_algolist(ses.writepayload, sshciphers);
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87
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88 /* mac_algorithms_client_to_server */
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89 buf_put_algolist(ses.writepayload, sshhashes);
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90
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91 /* mac_algorithms_server_to_client */
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92 buf_put_algolist(ses.writepayload, sshhashes);
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93
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94 /* compression_algorithms_client_to_server */
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95 buf_put_algolist(ses.writepayload, sshcompress);
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96
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97 /* compression_algorithms_server_to_client */
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98 buf_put_algolist(ses.writepayload, sshcompress);
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99
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100 /* languages_client_to_server */
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101 buf_putstring(ses.writepayload, "", 0);
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102
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103 /* languages_server_to_client */
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104 buf_putstring(ses.writepayload, "", 0);
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105
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106 /* first_kex_packet_follows - unimplemented for now */
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107 buf_putbyte(ses.writepayload, 0x00);
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108
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109 /* reserved unit32 */
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110 buf_putint(ses.writepayload, 0);
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111
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112 /* set up transmitted kex packet buffer for hashing.
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113 * This is freed after the end of the kex */
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114 ses.transkexinit = buf_newcopy(ses.writepayload);
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115
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116 encrypt_packet();
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117 ses.dataallowed = 0; /* don't send other packets during kex */
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118
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119 TRACE(("DATAALLOWED=0"));
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120 TRACE(("-> KEXINIT"));
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121 ses.kexstate.sentkexinit = 1;
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122 }
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123
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124 /* *** NOTE regarding (send|recv)_msg_newkeys ***
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125 * Changed by mihnea from the original kex.c to set dataallowed after a
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126 * completed key exchange, no matter the order in which it was performed.
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127 * This enables client mode without affecting server functionality.
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128 */
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129
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130 /* Bring new keys into use after a key exchange, and let the client know*/
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131 void send_msg_newkeys() {
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132
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133 TRACE(("enter send_msg_newkeys"));
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134
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135 /* generate the kexinit request */
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136 CHECKCLEARTOWRITE();
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137 buf_putbyte(ses.writepayload, SSH_MSG_NEWKEYS);
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138 encrypt_packet();
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139
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140
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141 /* set up our state */
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142 if (ses.kexstate.recvnewkeys) {
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143 TRACE(("while RECVNEWKEYS=1"));
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144 gen_new_keys();
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145 kexinitialise(); /* we've finished with this kex */
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146 TRACE((" -> DATAALLOWED=1"));
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147 ses.dataallowed = 1; /* we can send other packets again now */
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148 } else {
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149 ses.kexstate.sentnewkeys = 1;
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150 TRACE(("SENTNEWKEYS=1"));
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151 }
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152
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153 TRACE(("-> MSG_NEWKEYS"));
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154 TRACE(("leave send_msg_newkeys"));
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155 }
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156
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157 /* Bring the new keys into use after a key exchange */
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158 void recv_msg_newkeys() {
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159
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160 TRACE(("<- MSG_NEWKEYS"));
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161 TRACE(("enter recv_msg_newkeys"));
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162
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163 /* simply check if we've sent SSH_MSG_NEWKEYS, and if so,
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164 * switch to the new keys */
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165 if (ses.kexstate.sentnewkeys) {
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166 TRACE(("while SENTNEWKEYS=1"));
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167 gen_new_keys();
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168 kexinitialise(); /* we've finished with this kex */
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169 TRACE((" -> DATAALLOWED=1"));
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170 ses.dataallowed = 1; /* we can send other packets again now */
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171 } else {
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172 TRACE(("RECVNEWKEYS=1"));
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173 ses.kexstate.recvnewkeys = 1;
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174 }
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175
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176 TRACE(("leave recv_msg_newkeys"));
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177 }
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178
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179
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180 /* Duplicated verbatim from kex.c --mihnea */
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181 void kexinitialise() {
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182
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183 struct timeval tv;
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184
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185 TRACE(("kexinitialise()"));
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186
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187 /* sent/recv'd MSG_KEXINIT */
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188 ses.kexstate.sentkexinit = 0;
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189 ses.kexstate.recvkexinit = 0;
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190
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191 /* sent/recv'd MSG_NEWKEYS */
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192 ses.kexstate.recvnewkeys = 0;
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193 ses.kexstate.sentnewkeys = 0;
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194
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195 /* first_packet_follows */
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196 ses.kexstate.firstfollows = 0;
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197
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198 ses.kexstate.datatrans = 0;
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199 ses.kexstate.datarecv = 0;
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200
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201 if (gettimeofday(&tv, 0) < 0) {
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202 dropbear_exit("Error getting time");
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203 }
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204 ses.kexstate.lastkextime = tv.tv_sec;
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205
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206 }
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207
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208 /* Helper function for gen_new_keys, creates a hash. It makes a copy of the
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209 * already initialised hash_state hs, which should already have processed
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210 * the dh_K and hash, since these are common. X is the letter 'A', 'B' etc.
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211 * out must have at least min(SHA1_HASH_SIZE, outlen) bytes allocated.
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212 * The output will only be expanded once, since that is all that is required
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213 * (for 3DES and SHA, with 24 and 20 bytes respectively).
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214 *
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215 * See Section 5.2 of the IETF secsh Transport Draft for details */
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216
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217 /* Duplicated verbatim from kex.c --mihnea */
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218 static void hashkeys(unsigned char *out, int outlen,
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219 const hash_state * hs, const unsigned char X) {
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220
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221 hash_state hs2;
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222 unsigned char k2[SHA1_HASH_SIZE]; /* used to extending */
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223
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224 memcpy(&hs2, hs, sizeof(hash_state));
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225 sha1_process(&hs2, &X, 1);
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226 sha1_process(&hs2, ses.session_id, SHA1_HASH_SIZE);
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227 sha1_done(&hs2, out);
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228 if (SHA1_HASH_SIZE < outlen) {
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229 /* need to extend */
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230 memcpy(&hs2, hs, sizeof(hash_state));
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231 sha1_process(&hs2, out, SHA1_HASH_SIZE);
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232 sha1_done(&hs2, k2);
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233 memcpy(&out[SHA1_HASH_SIZE], k2, outlen - SHA1_HASH_SIZE);
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234 }
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235 }
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236
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237 /* Generate the actual encryption/integrity keys, using the results of the
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238 * key exchange, as specified in section 5.2 of the IETF secsh-transport
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239 * draft. This occurs after the DH key-exchange.
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240 *
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241 * ses.newkeys is the new set of keys which are generated, these are only
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242 * taken into use after both sides have sent a newkeys message */
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243
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244 /* Originally from kex.c, generalized for cli/svr mode --mihnea */
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245 static void gen_new_keys() {
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246
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247 unsigned char C2S_IV[MAX_IV_LEN];
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248 unsigned char C2S_key[MAX_KEY_LEN];
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249 unsigned char S2C_IV[MAX_IV_LEN];
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250 unsigned char S2C_key[MAX_KEY_LEN];
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251 /* unsigned char key[MAX_KEY_LEN]; */
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252 unsigned char *trans_IV, *trans_key, *recv_IV, *recv_key;
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253
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254 hash_state hs;
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255 unsigned int C2S_keysize, S2C_keysize;
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256 char mactransletter, macrecvletter; /* Client or server specific */
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257
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258 TRACE(("enter gen_new_keys"));
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259 /* the dh_K and hash are the start of all hashes, we make use of that */
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260
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261 sha1_init(&hs);
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262 sha1_process_mp(&hs, ses.dh_K);
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263 mp_clear(ses.dh_K);
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264 m_free(ses.dh_K);
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265 sha1_process(&hs, ses.hash, SHA1_HASH_SIZE);
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266 m_burn(ses.hash, SHA1_HASH_SIZE);
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267
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268 hashkeys(C2S_IV, SHA1_HASH_SIZE, &hs, 'A');
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269 hashkeys(S2C_IV, SHA1_HASH_SIZE, &hs, 'B');
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270
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271 if (IS_DROPBEAR_CLIENT) {
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272 trans_IV = C2S_IV;
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273 recv_IV = S2C_IV;
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274 trans_key = C2S_key;
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275 recv_key = S2C_key;
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276 C2S_keysize = ses.newkeys->trans_algo_crypt->keysize;
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277 S2C_keysize = ses.newkeys->recv_algo_crypt->keysize;
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278 mactransletter = 'E';
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279 macrecvletter = 'F';
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280 } else {
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281 trans_IV = S2C_IV;
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282 recv_IV = C2S_IV;
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283 trans_key = S2C_key;
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284 recv_key = C2S_key;
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285 C2S_keysize = ses.newkeys->recv_algo_crypt->keysize;
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286 S2C_keysize = ses.newkeys->trans_algo_crypt->keysize;
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287 mactransletter = 'F';
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288 macrecvletter = 'E';
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289 }
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290
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291 hashkeys(C2S_key, C2S_keysize, &hs, 'C');
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292 hashkeys(S2C_key, S2C_keysize, &hs, 'D');
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293
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294 if (cbc_start(
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295 find_cipher(ses.newkeys->recv_algo_crypt->cipherdesc->name),
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296 recv_IV, recv_key,
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297 ses.newkeys->recv_algo_crypt->keysize, 0,
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298 &ses.newkeys->recv_symmetric_struct) != CRYPT_OK) {
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299 dropbear_exit("crypto error");
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300 }
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301
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302 if (cbc_start(
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303 find_cipher(ses.newkeys->trans_algo_crypt->cipherdesc->name),
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304 trans_IV, trans_key,
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305 ses.newkeys->trans_algo_crypt->keysize, 0,
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306 &ses.newkeys->trans_symmetric_struct) != CRYPT_OK) {
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307 dropbear_exit("crypto error");
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308 }
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309
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310 /* MAC keys */
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311 hashkeys(ses.newkeys->transmackey,
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312 ses.newkeys->trans_algo_mac->keysize, &hs, mactransletter);
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313 hashkeys(ses.newkeys->recvmackey,
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314 ses.newkeys->recv_algo_mac->keysize, &hs, macrecvletter);
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315
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316 #ifndef DISABLE_ZLIB
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317 gen_new_zstreams();
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318 #endif
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319
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320 /* Switch over to the new keys */
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321 m_burn(ses.keys, sizeof(struct key_context));
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322 m_free(ses.keys);
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323 ses.keys = ses.newkeys;
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324 ses.newkeys = NULL;
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325
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326 TRACE(("leave gen_new_keys"));
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327 }
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328
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329 #ifndef DISABLE_ZLIB
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330 /* Set up new zlib compression streams, close the old ones. Only
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331 * called from gen_new_keys() */
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332 static void gen_new_zstreams() {
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333
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334 /* create new zstreams */
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335 if (ses.newkeys->recv_algo_comp == DROPBEAR_COMP_ZLIB) {
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336 ses.newkeys->recv_zstream = (z_streamp)m_malloc(sizeof(z_stream));
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337 ses.newkeys->recv_zstream->zalloc = Z_NULL;
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338 ses.newkeys->recv_zstream->zfree = Z_NULL;
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339
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340 if (inflateInit(ses.newkeys->recv_zstream) != Z_OK) {
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341 dropbear_exit("zlib error");
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342 }
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343 } else {
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344 ses.newkeys->recv_zstream = NULL;
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345 }
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346
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347 if (ses.newkeys->trans_algo_comp == DROPBEAR_COMP_ZLIB) {
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348 ses.newkeys->trans_zstream = (z_streamp)m_malloc(sizeof(z_stream));
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349 ses.newkeys->trans_zstream->zalloc = Z_NULL;
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350 ses.newkeys->trans_zstream->zfree = Z_NULL;
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351
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352 if (deflateInit(ses.newkeys->trans_zstream, Z_DEFAULT_COMPRESSION)
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353 != Z_OK) {
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354 dropbear_exit("zlib error");
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355 }
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356 } else {
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357 ses.newkeys->trans_zstream = NULL;
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358 }
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359
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parents:
diff changeset
360 /* clean up old keys */
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diff changeset
361 if (ses.keys->recv_zstream != NULL) {
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362 if (inflateEnd(ses.keys->recv_zstream) == Z_STREAM_ERROR) {
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363 /* Z_DATA_ERROR is ok, just means that stream isn't ended */
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364 dropbear_exit("crypto error");
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365 }
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366 m_free(ses.keys->recv_zstream);
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367 }
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368 if (ses.keys->trans_zstream != NULL) {
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369 if (deflateEnd(ses.keys->trans_zstream) == Z_STREAM_ERROR) {
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diff changeset
370 /* Z_DATA_ERROR is ok, just means that stream isn't ended */
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371 dropbear_exit("crypto error");
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372 }
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373 m_free(ses.keys->trans_zstream);
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374 }
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375 }
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diff changeset
376 #endif
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377
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378
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diff changeset
379 /* Executed upon receiving a kexinit message from the client to initiate
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diff changeset
380 * key exchange. If we haven't already done so, we send the list of our
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diff changeset
381 * preferred algorithms. The client's requested algorithms are processed,
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diff changeset
382 * and we calculate the first portion of the key-exchange-hash for used
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Matt Johnston <matt@ucc.asn.au>
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diff changeset
383 * later in the key exchange. No response is sent, as the client should
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
384 * initiate the diffie-hellman key exchange */
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385
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parents:
diff changeset
386 /* Originally from kex.c, generalized for cli/svr mode --mihnea */
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
387 /* Belongs in common_kex.c where it should be moved after review */
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Matt Johnston <matt@ucc.asn.au>
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diff changeset
388 void recv_msg_kexinit() {
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diff changeset
389
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Matt Johnston <matt@ucc.asn.au>
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diff changeset
390 TRACE(("<- KEXINIT"));
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diff changeset
391 TRACE(("enter recv_msg_kexinit"));
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diff changeset
392
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Matt Johnston <matt@ucc.asn.au>
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diff changeset
393 /* start the kex hash */
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parents:
diff changeset
394 ses.kexhashbuf = buf_new(MAX_KEXHASHBUF);
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parents:
diff changeset
395
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
396 if (!ses.kexstate.sentkexinit) {
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
397 /* we need to send a kex packet */
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
398 send_msg_kexinit();
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parents:
diff changeset
399 TRACE(("continue recv_msg_kexinit: sent kexinit"));
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parents:
diff changeset
400 }
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parents:
diff changeset
401
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parents:
diff changeset
402
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diff changeset
403 if (IS_DROPBEAR_CLIENT) {
26
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diff changeset
404 #ifdef DROPBEAR_CLIENT
4
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diff changeset
405
26
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diff changeset
406 /* read the peer's choice of algos */
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diff changeset
407 read_kex_algos(cli_buf_match_algo);
4
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diff changeset
408
26
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diff changeset
409 /* V_C, the client's version string (CR and NL excluded) */
4
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parents:
diff changeset
410 buf_putstring(ses.kexhashbuf,
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parents:
diff changeset
411 (unsigned char*)LOCAL_IDENT, strlen(LOCAL_IDENT));
26
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diff changeset
412 /* V_S, the server's version string (CR and NL excluded) */
4
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parents:
diff changeset
413 buf_putstring(ses.kexhashbuf,
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
414 ses.remoteident, strlen((char*)ses.remoteident));
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parents:
diff changeset
415
26
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416 /* I_C, the payload of the client's SSH_MSG_KEXINIT */
4
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diff changeset
417 buf_putstring(ses.kexhashbuf,
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parents:
diff changeset
418 buf_getptr(ses.transkexinit, ses.transkexinit->len),
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diff changeset
419 ses.transkexinit->len);
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420 /* I_S, the payload of the server's SSH_MSG_KEXINIT */
4
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diff changeset
421 buf_setpos(ses.payload, 0);
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parents:
diff changeset
422 buf_putstring(ses.kexhashbuf,
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parents:
diff changeset
423 buf_getptr(ses.payload, ses.payload->len),
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Matt Johnston <matt@ucc.asn.au>
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diff changeset
424 ses.payload->len);
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diff changeset
425
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diff changeset
426 cli_ses.state = KEXINIT_RCVD;
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diff changeset
427 #endif
4
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428 } else {
26
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diff changeset
429 /* SERVER */
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diff changeset
430 #ifdef DROPBEAR_SERVER
4
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diff changeset
431
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diff changeset
432 /* read the peer's choice of algos */
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diff changeset
433 read_kex_algos(svr_buf_match_algo);
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diff changeset
434 /* V_C, the client's version string (CR and NL excluded) */
4
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diff changeset
435 buf_putstring(ses.kexhashbuf,
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diff changeset
436 ses.remoteident, strlen((char*)ses.remoteident));
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diff changeset
437 /* V_S, the server's version string (CR and NL excluded) */
4
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parents:
diff changeset
438 buf_putstring(ses.kexhashbuf,
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
439 (unsigned char*)LOCAL_IDENT, strlen(LOCAL_IDENT));
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parents:
diff changeset
440
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441 /* I_C, the payload of the client's SSH_MSG_KEXINIT */
4
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diff changeset
442 buf_setpos(ses.payload, 0);
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parents:
diff changeset
443 buf_putstring(ses.kexhashbuf,
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diff changeset
444 buf_getptr(ses.payload, ses.payload->len),
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diff changeset
445 ses.payload->len);
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446 /* I_S, the payload of the server's SSH_MSG_KEXINIT */
4
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parents:
diff changeset
447 buf_putstring(ses.kexhashbuf,
fe6bca95afa7 Makefile.in contains updated files required
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parents:
diff changeset
448 buf_getptr(ses.transkexinit, ses.transkexinit->len),
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parents:
diff changeset
449 ses.transkexinit->len);
26
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diff changeset
450 ses.requirenext = SSH_MSG_KEXDH_INIT;
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diff changeset
451 #endif
4
fe6bca95afa7 Makefile.in contains updated files required
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parents:
diff changeset
452 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
453
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
454 buf_free(ses.transkexinit);
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
455 ses.transkexinit = NULL;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
456 /* the rest of ses.kexhashbuf will be done after DH exchange */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
457
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
458 ses.kexstate.recvkexinit = 1;
22
c1e5d9195402 merge of abac2150ee4f4031a98016241fbd136d24fed127
Matt Johnston <matt@ucc.asn.au>
parents: 4
diff changeset
459 // ses.expecting = 0; // client matt
4
fe6bca95afa7 Makefile.in contains updated files required
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parents:
diff changeset
460
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
461 TRACE(("leave recv_msg_kexinit"));
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parents:
diff changeset
462 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
463
26
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parents: 22
diff changeset
464 /* Initialises and generate one side of the diffie-hellman key exchange values.
0969767bca0d snapshot of stuff
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parents: 22
diff changeset
465 * See the ietf-secsh-transport draft, section 6, for details */
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diff changeset
466 void gen_kexdh_vals(mp_int *dh_pub, mp_int *dh_priv) {
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parents: 22
diff changeset
467
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diff changeset
468 mp_int dh_p, dh_q, dh_g;
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parents: 22
diff changeset
469 unsigned char randbuf[DH_P_LEN];
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diff changeset
470 int dh_q_len;
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parents: 22
diff changeset
471
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parents: 22
diff changeset
472 TRACE(("enter send_msg_kexdh_reply"));
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diff changeset
473
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diff changeset
474 m_mp_init_multi(&dh_g, &dh_p, &dh_q, dh_priv, dh_pub, NULL);
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diff changeset
475
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diff changeset
476 /* read the prime and generator*/
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parents: 22
diff changeset
477 if (mp_read_unsigned_bin(&dh_p, (unsigned char*)dh_p_val, DH_P_LEN)
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parents: 22
diff changeset
478 != MP_OKAY) {
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parents: 22
diff changeset
479 dropbear_exit("Diffie-Hellman error");
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parents: 22
diff changeset
480 }
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parents: 22
diff changeset
481
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diff changeset
482 if (mp_set_int(&dh_g, DH_G_VAL) != MP_OKAY) {
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diff changeset
483 dropbear_exit("Diffie-Hellman error");
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diff changeset
484 }
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parents: 22
diff changeset
485
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parents: 22
diff changeset
486 /* calculate q = (p-1)/2 */
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parents: 22
diff changeset
487 /* dh_priv is just a temp var here */
0969767bca0d snapshot of stuff
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parents: 22
diff changeset
488 if (mp_sub_d(&dh_p, 1, dh_priv) != MP_OKAY) {
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parents: 22
diff changeset
489 dropbear_exit("Diffie-Hellman error");
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parents: 22
diff changeset
490 }
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parents: 22
diff changeset
491 if (mp_div_2(dh_priv, &dh_q) != MP_OKAY) {
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parents: 22
diff changeset
492 dropbear_exit("Diffie-Hellman error");
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parents: 22
diff changeset
493 }
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parents: 22
diff changeset
494
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parents: 22
diff changeset
495 dh_q_len = mp_unsigned_bin_size(&dh_q);
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parents: 22
diff changeset
496
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Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
497 /* calculate our random value dh_y */
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parents: 22
diff changeset
498 do {
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parents: 22
diff changeset
499 assert((unsigned int)dh_q_len <= sizeof(randbuf));
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parents: 22
diff changeset
500 genrandom(randbuf, dh_q_len);
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parents: 22
diff changeset
501 if (mp_read_unsigned_bin(dh_priv, randbuf, dh_q_len) != MP_OKAY) {
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parents: 22
diff changeset
502 dropbear_exit("Diffie-Hellman error");
0969767bca0d snapshot of stuff
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parents: 22
diff changeset
503 }
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diff changeset
504 } while (mp_cmp(dh_priv, &dh_q) == MP_GT || mp_cmp_d(dh_priv, 0) != MP_GT);
0969767bca0d snapshot of stuff
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parents: 22
diff changeset
505
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parents: 22
diff changeset
506 /* f = g^y mod p */
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parents: 22
diff changeset
507 if (mp_exptmod(&dh_g, dh_priv, &dh_p, dh_pub) != MP_OKAY) {
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parents: 22
diff changeset
508 dropbear_exit("Diffie-Hellman error");
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parents: 22
diff changeset
509 }
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parents: 22
diff changeset
510 mp_clear_multi(&dh_g, &dh_p, &dh_q, NULL);
0969767bca0d snapshot of stuff
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parents: 22
diff changeset
511 }
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
512
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
513 /* This function is fairly common between client/server, with some substitution
0969767bca0d snapshot of stuff
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parents: 22
diff changeset
514 * of dh_e/dh_f etc. Hence these arguments:
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parents: 22
diff changeset
515 * dh_pub_us is 'e' for the client, 'f' for the server. dh_pub_them is
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parents: 22
diff changeset
516 * vice-versa. dh_priv is the x/y value corresponding to dh_pub_us */
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parents: 22
diff changeset
517 void kexdh_comb_key(mp_int *dh_pub_us, mp_int *dh_priv, mp_int *dh_pub_them,
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parents: 22
diff changeset
518 sign_key *hostkey) {
0969767bca0d snapshot of stuff
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parents: 22
diff changeset
519
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parents: 22
diff changeset
520 mp_int dh_p;
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parents: 22
diff changeset
521 mp_int *dh_e = NULL, *dh_f = NULL;
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parents: 22
diff changeset
522 hash_state hs;
0969767bca0d snapshot of stuff
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parents: 22
diff changeset
523
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parents: 22
diff changeset
524 /* read the prime and generator*/
0969767bca0d snapshot of stuff
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parents: 22
diff changeset
525 mp_init(&dh_p);
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Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
526 if (mp_read_unsigned_bin(&dh_p, (unsigned char*)dh_p_val, DH_P_LEN)
0969767bca0d snapshot of stuff
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parents: 22
diff changeset
527 != MP_OKAY) {
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parents: 22
diff changeset
528 dropbear_exit("Diffie-Hellman error");
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
529 }
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
530
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Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
531 /* Check that dh_pub_them (dh_e or dh_f) is in the range [1, p-1] */
0969767bca0d snapshot of stuff
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parents: 22
diff changeset
532 if (mp_cmp(dh_pub_them, &dh_p) != MP_LT
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
533 || mp_cmp_d(dh_pub_them, 0) != MP_GT) {
0969767bca0d snapshot of stuff
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parents: 22
diff changeset
534 dropbear_exit("Diffie-Hellman error");
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
535 }
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
536
0969767bca0d snapshot of stuff
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parents: 22
diff changeset
537 /* K = e^y mod p = f^x mod p */
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
538 ses.dh_K = (mp_int*)m_malloc(sizeof(mp_int));
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
539 m_mp_init(ses.dh_K);
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
540 if (mp_exptmod(dh_pub_them, dh_priv, &dh_p, ses.dh_K) != MP_OKAY) {
0969767bca0d snapshot of stuff
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parents: 22
diff changeset
541 dropbear_exit("Diffie-Hellman error");
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
542 }
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
543
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
544 /* clear no longer needed vars */
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
545 mp_clear_multi(&dh_p, NULL);
0969767bca0d snapshot of stuff
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parents: 22
diff changeset
546
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
547 /* From here on, the code needs to work with the _same_ vars on each side,
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
548 * not vice-versaing for client/server */
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
549 if (IS_DROPBEAR_CLIENT) {
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
550 dh_e = dh_pub_us;
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
551 dh_f = dh_pub_them;
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
552 } else {
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
553 dh_e = dh_pub_them;
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
554 dh_f = dh_pub_us;
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
555 }
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
556
0969767bca0d snapshot of stuff
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parents: 22
diff changeset
557 /* Create the remainder of the hash buffer, to generate the exchange hash */
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
558 /* K_S, the host key */
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
559 buf_put_pub_key(ses.kexhashbuf, hostkey, ses.newkeys->algo_hostkey);
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
560 /* e, exchange value sent by the client */
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
561 buf_putmpint(ses.kexhashbuf, dh_e);
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
562 /* f, exchange value sent by the server */
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
563 buf_putmpint(ses.kexhashbuf, dh_f);
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
564 /* K, the shared secret */
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
565 buf_putmpint(ses.kexhashbuf, ses.dh_K);
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
566
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
567 /* calculate the hash H to sign */
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
568 sha1_init(&hs);
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
569 buf_setpos(ses.kexhashbuf, 0);
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
570 sha1_process(&hs, buf_getptr(ses.kexhashbuf, ses.kexhashbuf->len),
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
571 ses.kexhashbuf->len);
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
572 sha1_done(&hs, ses.hash);
0969767bca0d snapshot of stuff
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parents: 22
diff changeset
573 buf_free(ses.kexhashbuf);
0969767bca0d snapshot of stuff
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parents: 22
diff changeset
574 ses.kexhashbuf = NULL;
0969767bca0d snapshot of stuff
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parents: 22
diff changeset
575
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
576 /* first time around, we set the session_id to H */
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
577 if (ses.session_id == NULL) {
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
578 /* create the session_id, this never needs freeing */
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
579 ses.session_id = (unsigned char*)m_malloc(SHA1_HASH_SIZE);
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
580 memcpy(ses.session_id, ses.hash, SHA1_HASH_SIZE);
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
581 }
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
582 }
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
583
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
584 /* read the other side's algo list. buf_match_algo is a callback to match
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
585 * algos for the client or server. */
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
586 void read_kex_algos(
0969767bca0d snapshot of stuff
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parents: 22
diff changeset
587 algo_type*(buf_match_algo)(buffer*buf, algo_type localalgos[],
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
588 int *goodguess)) {
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
589
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
590 algo_type * algo;
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
591 char * erralgo = NULL;
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
592
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
593 int goodguess = 0;
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
594 int allgood = 1; /* we AND this with each goodguess and see if its still
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
595 true after */
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
596
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
597 buf_incrpos(ses.payload, 16); /* start after the cookie */
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
598
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
599 ses.newkeys = (struct key_context*)m_malloc(sizeof(struct key_context));
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
600
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
601 /* kex_algorithms */
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
602 algo = buf_match_algo(ses.payload, sshkex, &goodguess);
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
603 allgood &= goodguess;
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
604 if (algo == NULL) {
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
605 erralgo = "kex";
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
606 goto error;
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
607 }
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
608 ses.newkeys->algo_kex = algo->val;
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
609
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
610 /* server_host_key_algorithms */
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
611 algo = buf_match_algo(ses.payload, sshhostkey, &goodguess);
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
612 allgood &= goodguess;
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
613 if (algo == NULL) {
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
614 erralgo = "hostkey";
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
615 goto error;
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
616 }
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
617 ses.newkeys->algo_hostkey = algo->val;
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
618
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
619 /* encryption_algorithms_client_to_server */
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
620 algo = buf_match_algo(ses.payload, sshciphers, &goodguess);
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
621 if (algo == NULL) {
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
622 erralgo = "enc c->s";
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
623 goto error;
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
624 }
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
625 ses.newkeys->recv_algo_crypt = (struct dropbear_cipher*)algo->data;
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
626
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
627 /* encryption_algorithms_server_to_client */
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
628 algo = buf_match_algo(ses.payload, sshciphers, &goodguess);
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
629 if (algo == NULL) {
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
630 erralgo = "enc s->c";
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
631 goto error;
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
632 }
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
633 ses.newkeys->trans_algo_crypt = (struct dropbear_cipher*)algo->data;
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
634
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
635 /* mac_algorithms_client_to_server */
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
636 algo = buf_match_algo(ses.payload, sshhashes, &goodguess);
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
637 if (algo == NULL) {
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
638 erralgo = "mac c->s";
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
639 goto error;
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
640 }
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
641 ses.newkeys->recv_algo_mac = (struct dropbear_hash*)algo->data;
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
642
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
643 /* mac_algorithms_server_to_client */
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
644 algo = buf_match_algo(ses.payload, sshhashes, &goodguess);
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
645 if (algo == NULL) {
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
646 erralgo = "mac s->c";
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
647 goto error;
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
648 }
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
649 ses.newkeys->trans_algo_mac = (struct dropbear_hash*)algo->data;
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
650
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
651 /* compression_algorithms_client_to_server */
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
652 algo = buf_match_algo(ses.payload, sshcompress, &goodguess);
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
653 if (algo == NULL) {
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
654 erralgo = "comp c->s";
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
655 goto error;
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
656 }
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
657 ses.newkeys->recv_algo_comp = algo->val;
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
658
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
659 /* compression_algorithms_server_to_client */
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
660 algo = buf_match_algo(ses.payload, sshcompress, &goodguess);
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
661 if (algo == NULL) {
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
662 erralgo = "comp s->c";
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
663 goto error;
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
664 }
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
665 ses.newkeys->trans_algo_comp = algo->val;
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
666
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
667 /* languages_client_to_server */
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
668 buf_eatstring(ses.payload);
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
669
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
670 /* languages_server_to_client */
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
671 buf_eatstring(ses.payload);
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
672
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
673 /* first_kex_packet_follows */
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
674 if (buf_getbyte(ses.payload)) {
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
675 ses.kexstate.firstfollows = 1;
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
676 /* if the guess wasn't good, we ignore the packet sent */
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
677 if (!allgood) {
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
678 ses.ignorenext = 1;
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
679 }
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
680 }
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
681
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
682 /* reserved for future extensions */
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
683 buf_getint(ses.payload);
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
684 return;
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
685
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
686 error:
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
687 dropbear_exit("no matching algo %s", erralgo);
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
688 }