annotate common-kex.c @ 22:c1e5d9195402

merge of abac2150ee4f4031a98016241fbd136d24fed127 and ffa047425729e478a5b49b1ab0f8ec71c08a1421
author Matt Johnston <matt@ucc.asn.au>
date Wed, 23 Jun 2004 07:14:16 +0000
parents fe6bca95afa7
children 0969767bca0d
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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 /* TODO - currently not handled */
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197 ses.kexstate.firstfollows = 0;
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198
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199 ses.kexstate.datatrans = 0;
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200 ses.kexstate.datarecv = 0;
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201
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202 if (gettimeofday(&tv, 0) < 0) {
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203 dropbear_exit("Error getting time");
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204 }
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205 ses.kexstate.lastkextime = tv.tv_sec;
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206
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207 }
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208
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209 /* Helper function for gen_new_keys, creates a hash. It makes a copy of the
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210 * already initialised hash_state hs, which should already have processed
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211 * the dh_K and hash, since these are common. X is the letter 'A', 'B' etc.
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212 * out must have at least min(SHA1_HASH_SIZE, outlen) bytes allocated.
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213 * The output will only be expanded once, since that is all that is required
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214 * (for 3DES and SHA, with 24 and 20 bytes respectively).
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215 *
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216 * See Section 5.2 of the IETF secsh Transport Draft for details */
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217
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218 /* Duplicated verbatim from kex.c --mihnea */
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219 static void hashkeys(unsigned char *out, int outlen,
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220 const hash_state * hs, const unsigned char X) {
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221
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222 hash_state hs2;
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223 unsigned char k2[SHA1_HASH_SIZE]; /* used to extending */
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224
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225 memcpy(&hs2, hs, sizeof(hash_state));
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226 sha1_process(&hs2, &X, 1);
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227 sha1_process(&hs2, ses.session_id, SHA1_HASH_SIZE);
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228 sha1_done(&hs2, out);
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229 if (SHA1_HASH_SIZE < outlen) {
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230 /* need to extend */
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231 memcpy(&hs2, hs, sizeof(hash_state));
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232 sha1_process(&hs2, out, SHA1_HASH_SIZE);
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233 sha1_done(&hs2, k2);
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234 memcpy(&out[SHA1_HASH_SIZE], k2, outlen - SHA1_HASH_SIZE);
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235 }
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236 }
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237
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238 /* Generate the actual encryption/integrity keys, using the results of the
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239 * key exchange, as specified in section 5.2 of the IETF secsh-transport
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240 * draft. This occurs after the DH key-exchange.
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241 *
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242 * ses.newkeys is the new set of keys which are generated, these are only
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243 * taken into use after both sides have sent a newkeys message */
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244
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245 /* Originally from kex.c, generalized for cli/svr mode --mihnea */
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246 static void gen_new_keys() {
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247
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248 unsigned char C2S_IV[MAX_IV_LEN];
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249 unsigned char C2S_key[MAX_KEY_LEN];
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250 unsigned char S2C_IV[MAX_IV_LEN];
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251 unsigned char S2C_key[MAX_KEY_LEN];
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252 /* unsigned char key[MAX_KEY_LEN]; */
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253 unsigned char *trans_IV, *trans_key, *recv_IV, *recv_key;
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254
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255 hash_state hs;
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256 unsigned int C2S_keysize, S2C_keysize;
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257 char mactransletter, macrecvletter; /* Client or server specific */
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258
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259 TRACE(("enter gen_new_keys"));
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260 /* the dh_K and hash are the start of all hashes, we make use of that */
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261
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262 sha1_init(&hs);
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263 sha1_process_mp(&hs, ses.dh_K);
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264 mp_clear(ses.dh_K);
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265 m_free(ses.dh_K);
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266 sha1_process(&hs, ses.hash, SHA1_HASH_SIZE);
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267 m_burn(ses.hash, SHA1_HASH_SIZE);
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268
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269 hashkeys(C2S_IV, SHA1_HASH_SIZE, &hs, 'A');
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270 hashkeys(S2C_IV, SHA1_HASH_SIZE, &hs, 'B');
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271
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272 if (IS_DROPBEAR_CLIENT) {
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273 trans_IV = C2S_IV;
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274 recv_IV = S2C_IV;
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275 trans_key = C2S_key;
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276 recv_key = S2C_key;
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277 C2S_keysize = ses.newkeys->trans_algo_crypt->keysize;
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278 S2C_keysize = ses.newkeys->recv_algo_crypt->keysize;
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279 mactransletter = 'E';
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280 macrecvletter = 'F';
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281 } else {
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282 trans_IV = S2C_IV;
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283 recv_IV = C2S_IV;
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284 trans_key = S2C_key;
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285 recv_key = C2S_key;
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286 C2S_keysize = ses.newkeys->recv_algo_crypt->keysize;
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287 S2C_keysize = ses.newkeys->trans_algo_crypt->keysize;
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288 mactransletter = 'F';
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289 macrecvletter = 'E';
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290 }
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291
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292 hashkeys(C2S_key, C2S_keysize, &hs, 'C');
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293 hashkeys(S2C_key, S2C_keysize, &hs, 'D');
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294
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295 if (cbc_start(
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296 find_cipher(ses.newkeys->recv_algo_crypt->cipherdesc->name),
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diff changeset
297 recv_IV, recv_key,
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298 ses.newkeys->recv_algo_crypt->keysize, 0,
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diff changeset
299 &ses.newkeys->recv_symmetric_struct) != CRYPT_OK) {
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diff changeset
300 dropbear_exit("crypto error");
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301 }
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parents:
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302
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
303 if (cbc_start(
fe6bca95afa7 Makefile.in contains updated files required
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diff changeset
304 find_cipher(ses.newkeys->trans_algo_crypt->cipherdesc->name),
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diff changeset
305 trans_IV, trans_key,
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diff changeset
306 ses.newkeys->trans_algo_crypt->keysize, 0,
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
307 &ses.newkeys->trans_symmetric_struct) != CRYPT_OK) {
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parents:
diff changeset
308 dropbear_exit("crypto error");
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parents:
diff changeset
309 }
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diff changeset
310
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
311 /* MAC keys */
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
312 hashkeys(ses.newkeys->transmackey,
fe6bca95afa7 Makefile.in contains updated files required
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diff changeset
313 ses.newkeys->trans_algo_mac->keysize, &hs, mactransletter);
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diff changeset
314 hashkeys(ses.newkeys->recvmackey,
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diff changeset
315 ses.newkeys->recv_algo_mac->keysize, &hs, macrecvletter);
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parents:
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316
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parents:
diff changeset
317 #ifndef DISABLE_ZLIB
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diff changeset
318 gen_new_zstreams();
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diff changeset
319 #endif
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320
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
321 /* Switch over to the new keys */
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diff changeset
322 m_burn(ses.keys, sizeof(struct key_context));
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
323 m_free(ses.keys);
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diff changeset
324 ses.keys = ses.newkeys;
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325 ses.newkeys = NULL;
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326
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327 TRACE(("leave gen_new_keys"));
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328 }
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329
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330 #ifndef DISABLE_ZLIB
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diff changeset
331 /* Set up new zlib compression streams, close the old ones. Only
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
332 * called from gen_new_keys() */
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
333 static void gen_new_zstreams() {
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334
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parents:
diff changeset
335 /* create new zstreams */
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diff changeset
336 if (ses.newkeys->recv_algo_comp == DROPBEAR_COMP_ZLIB) {
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diff changeset
337 ses.newkeys->recv_zstream = (z_streamp)m_malloc(sizeof(z_stream));
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parents:
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338 ses.newkeys->recv_zstream->zalloc = Z_NULL;
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Matt Johnston <matt@ucc.asn.au>
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diff changeset
339 ses.newkeys->recv_zstream->zfree = Z_NULL;
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Matt Johnston <matt@ucc.asn.au>
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340
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
341 if (inflateInit(ses.newkeys->recv_zstream) != Z_OK) {
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parents:
diff changeset
342 dropbear_exit("zlib error");
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Matt Johnston <matt@ucc.asn.au>
parents:
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343 }
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parents:
diff changeset
344 } else {
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diff changeset
345 ses.newkeys->recv_zstream = NULL;
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
346 }
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parents:
diff changeset
347
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
348 if (ses.newkeys->trans_algo_comp == DROPBEAR_COMP_ZLIB) {
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parents:
diff changeset
349 ses.newkeys->trans_zstream = (z_streamp)m_malloc(sizeof(z_stream));
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diff changeset
350 ses.newkeys->trans_zstream->zalloc = Z_NULL;
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
351 ses.newkeys->trans_zstream->zfree = Z_NULL;
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parents:
diff changeset
352
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
353 if (deflateInit(ses.newkeys->trans_zstream, Z_DEFAULT_COMPRESSION)
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
354 != Z_OK) {
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
355 dropbear_exit("zlib error");
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
356 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
357 } else {
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
358 ses.newkeys->trans_zstream = NULL;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
359 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
360
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
361 /* clean up old keys */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
362 if (ses.keys->recv_zstream != NULL) {
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
363 if (inflateEnd(ses.keys->recv_zstream) == Z_STREAM_ERROR) {
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
364 /* Z_DATA_ERROR is ok, just means that stream isn't ended */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
365 dropbear_exit("crypto error");
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
366 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
367 m_free(ses.keys->recv_zstream);
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
368 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
369 if (ses.keys->trans_zstream != NULL) {
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
370 if (deflateEnd(ses.keys->trans_zstream) == Z_STREAM_ERROR) {
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
371 /* Z_DATA_ERROR is ok, just means that stream isn't ended */
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
372 dropbear_exit("crypto error");
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
373 }
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
374 m_free(ses.keys->trans_zstream);
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
375 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
376 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
377 #endif
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
378
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
379
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
380 /* Executed upon receiving a kexinit message from the client to initiate
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
381 * key exchange. If we haven't already done so, we send the list of our
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
382 * preferred algorithms. The client's requested algorithms are processed,
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
383 * and we calculate the first portion of the key-exchange-hash for used
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
384 * later in the key exchange. No response is sent, as the client should
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
385 * initiate the diffie-hellman key exchange */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
386
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
387 /* Originally from kex.c, generalized for cli/svr mode --mihnea */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
388 /* Belongs in common_kex.c where it should be moved after review */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
389 void recv_msg_kexinit() {
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
390
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
391 TRACE(("<- KEXINIT"));
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
392 TRACE(("enter recv_msg_kexinit"));
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
393
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
394 /* start the kex hash */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
395 ses.kexhashbuf = buf_new(MAX_KEXHASHBUF);
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
396
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
397 if (!ses.kexstate.sentkexinit) {
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
398 /* we need to send a kex packet */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
399 send_msg_kexinit();
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
400 TRACE(("continue recv_msg_kexinit: sent kexinit"));
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
401 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
402
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
403
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
404 if (IS_DROPBEAR_CLIENT) {
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
405
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
406 /* read the peer's choice of algos */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
407 cli_read_kex();
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
408
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
409 /* V_C, the client's version string (CR and NL excluded) */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
410 buf_putstring(ses.kexhashbuf,
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
411 (unsigned char*)LOCAL_IDENT, strlen(LOCAL_IDENT));
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
412 /* V_S, the server's version string (CR and NL excluded) */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
413 buf_putstring(ses.kexhashbuf,
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
414 ses.remoteident, strlen((char*)ses.remoteident));
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
415
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
416 /* I_C, the payload of the client's SSH_MSG_KEXINIT */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
417 buf_putstring(ses.kexhashbuf,
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
418 buf_getptr(ses.transkexinit, ses.transkexinit->len),
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
419 ses.transkexinit->len);
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
420 /* I_S, the payload of the server's SSH_MSG_KEXINIT */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
421 buf_setpos(ses.payload, 0);
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
422 buf_putstring(ses.kexhashbuf,
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
423 buf_getptr(ses.payload, ses.payload->len),
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
424 ses.payload->len);
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
425
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
426 } else {
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
427
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
428 /* read the peer's choice of algos */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
429 svr_read_kex();
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
430 /* V_C, the client's version string (CR and NL excluded) */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
431 buf_putstring(ses.kexhashbuf,
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
432 ses.remoteident, strlen((char*)ses.remoteident));
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
433 /* V_S, the server's version string (CR and NL excluded) */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
434 buf_putstring(ses.kexhashbuf,
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
435 (unsigned char*)LOCAL_IDENT, strlen(LOCAL_IDENT));
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
436
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
437 /* I_C, the payload of the client's SSH_MSG_KEXINIT */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
438 buf_setpos(ses.payload, 0);
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
439 buf_putstring(ses.kexhashbuf,
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
440 buf_getptr(ses.payload, ses.payload->len),
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
441 ses.payload->len);
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
442 /* I_S, the payload of the server's SSH_MSG_KEXINIT */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
443 buf_putstring(ses.kexhashbuf,
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
444 buf_getptr(ses.transkexinit, ses.transkexinit->len),
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
445 ses.transkexinit->len);
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
446 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
447
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
448 buf_free(ses.transkexinit);
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
449 ses.transkexinit = NULL;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
450 /* 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
451
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
452 ses.kexstate.recvkexinit = 1;
22
c1e5d9195402 merge of abac2150ee4f4031a98016241fbd136d24fed127
Matt Johnston <matt@ucc.asn.au>
parents: 4
diff changeset
453 ses.requirenext = SSH_MSG_KEXDH_INIT;
c1e5d9195402 merge of abac2150ee4f4031a98016241fbd136d24fed127
Matt Johnston <matt@ucc.asn.au>
parents: 4
diff changeset
454 // ses.expecting = 0; // client matt
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
455
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
456 TRACE(("leave recv_msg_kexinit"));
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