annotate common-kex.c @ 250:d059b0bb57dd

Forgot to revert echo flag
author Matt Johnston <matt@ucc.asn.au>
date Tue, 20 Sep 2005 17:36:32 +0000
parents 5e4110bb753a
children 29afa62b5450 63601217f5ab
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1 /*
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2 * Dropbear SSH
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3 *
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4 * Copyright (c) 2002-2004 Matt Johnston
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5 * Portions Copyright (c) 2004 by Mihnea Stoenescu
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6 * All rights reserved.
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7 *
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8 * Permission is hereby granted, free of charge, to any person obtaining a copy
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9 * of this software and associated documentation files (the "Software"), to deal
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10 * in the Software without restriction, including without limitation the rights
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11 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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12 * copies of the Software, and to permit persons to whom the Software is
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13 * furnished to do so, subject to the following conditions:
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14 *
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15 * The above copyright notice and this permission notice shall be included in
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16 * all copies or substantial portions of the Software.
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17 *
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18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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19 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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20 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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21 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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22 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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23 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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24 * SOFTWARE. */
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25
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26 #include "includes.h"
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27 #include "dbutil.h"
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28 #include "algo.h"
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29 #include "buffer.h"
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30 #include "session.h"
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31 #include "kex.h"
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32 #include "ssh.h"
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33 #include "packet.h"
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34 #include "bignum.h"
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35 #include "random.h"
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36
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37 /* diffie-hellman-group1-sha1 value for p */
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38 static const unsigned char dh_p_val[] = {
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39 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xC9, 0x0F, 0xDA, 0xA2,
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40 0x21, 0x68, 0xC2, 0x34, 0xC4, 0xC6, 0x62, 0x8B, 0x80, 0xDC, 0x1C, 0xD1,
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41 0x29, 0x02, 0x4E, 0x08, 0x8A, 0x67, 0xCC, 0x74, 0x02, 0x0B, 0xBE, 0xA6,
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42 0x3B, 0x13, 0x9B, 0x22, 0x51, 0x4A, 0x08, 0x79, 0x8E, 0x34, 0x04, 0xDD,
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43 0xEF, 0x95, 0x19, 0xB3, 0xCD, 0x3A, 0x43, 0x1B, 0x30, 0x2B, 0x0A, 0x6D,
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44 0xF2, 0x5F, 0x14, 0x37, 0x4F, 0xE1, 0x35, 0x6D, 0x6D, 0x51, 0xC2, 0x45,
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45 0xE4, 0x85, 0xB5, 0x76, 0x62, 0x5E, 0x7E, 0xC6, 0xF4, 0x4C, 0x42, 0xE9,
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46 0xA6, 0x37, 0xED, 0x6B, 0x0B, 0xFF, 0x5C, 0xB6, 0xF4, 0x06, 0xB7, 0xED,
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47 0xEE, 0x38, 0x6B, 0xFB, 0x5A, 0x89, 0x9F, 0xA5, 0xAE, 0x9F, 0x24, 0x11,
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48 0x7C, 0x4B, 0x1F, 0xE6, 0x49, 0x28, 0x66, 0x51, 0xEC, 0xE6, 0x53, 0x81,
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49 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF};
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50 #define DH_P_LEN sizeof(dh_p_val)
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52 static const int DH_G_VAL = 2;
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53
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54 static void kexinitialise();
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55 void gen_new_keys();
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56 #ifndef DISABLE_ZLIB
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57 static void gen_new_zstreams();
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58 #endif
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59 static void read_kex_algos();
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60 /* helper function for gen_new_keys */
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61 static void hashkeys(unsigned char *out, int outlen,
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62 const hash_state * hs, unsigned const char X);
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65 /* Send our list of algorithms we can use */
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66 void send_msg_kexinit() {
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67
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68 CHECKCLEARTOWRITE();
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69 buf_putbyte(ses.writepayload, SSH_MSG_KEXINIT);
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71 /* cookie */
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72 genrandom(buf_getwriteptr(ses.writepayload, 16), 16);
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73 buf_incrwritepos(ses.writepayload, 16);
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74
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75 /* kex algos */
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76 buf_put_algolist(ses.writepayload, sshkex);
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77
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78 /* server_host_key_algorithms */
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79 buf_put_algolist(ses.writepayload, sshhostkey);
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80
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81 /* encryption_algorithms_client_to_server */
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82 buf_put_algolist(ses.writepayload, sshciphers);
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83
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84 /* encryption_algorithms_server_to_client */
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85 buf_put_algolist(ses.writepayload, sshciphers);
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86
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87 /* mac_algorithms_client_to_server */
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88 buf_put_algolist(ses.writepayload, sshhashes);
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89
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90 /* mac_algorithms_server_to_client */
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91 buf_put_algolist(ses.writepayload, sshhashes);
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92
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93 /* compression_algorithms_client_to_server */
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94 buf_put_algolist(ses.writepayload, sshcompress);
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95
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96 /* compression_algorithms_server_to_client */
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97 buf_put_algolist(ses.writepayload, sshcompress);
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98
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99 /* languages_client_to_server */
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100 buf_putstring(ses.writepayload, "", 0);
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101
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102 /* languages_server_to_client */
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103 buf_putstring(ses.writepayload, "", 0);
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104
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105 /* first_kex_packet_follows - unimplemented for now */
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106 buf_putbyte(ses.writepayload, 0x00);
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107
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108 /* reserved unit32 */
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109 buf_putint(ses.writepayload, 0);
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110
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111 /* set up transmitted kex packet buffer for hashing.
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112 * This is freed after the end of the kex */
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113 ses.transkexinit = buf_newcopy(ses.writepayload);
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114
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115 encrypt_packet();
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116 ses.dataallowed = 0; /* don't send other packets during kex */
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117
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118 TRACE(("DATAALLOWED=0"))
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119 TRACE(("-> KEXINIT"))
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120 ses.kexstate.sentkexinit = 1;
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121 }
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122
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123 /* *** NOTE regarding (send|recv)_msg_newkeys ***
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124 * Changed by mihnea from the original kex.c to set dataallowed after a
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125 * completed key exchange, no matter the order in which it was performed.
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126 * This enables client mode without affecting server functionality.
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127 */
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128
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129 /* Bring new keys into use after a key exchange, and let the client know*/
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130 void send_msg_newkeys() {
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131
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132 TRACE(("enter send_msg_newkeys"))
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133
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134 /* generate the kexinit request */
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135 CHECKCLEARTOWRITE();
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136 buf_putbyte(ses.writepayload, SSH_MSG_NEWKEYS);
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137 encrypt_packet();
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138
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139
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140 /* set up our state */
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141 if (ses.kexstate.recvnewkeys) {
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142 TRACE(("while RECVNEWKEYS=1"))
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143 gen_new_keys();
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144 kexinitialise(); /* we've finished with this kex */
165
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145 TRACE((" -> DATAALLOWED=1"))
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146 ses.dataallowed = 1; /* we can send other packets again now */
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147 ses.kexstate.donefirstkex = 1;
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148 } else {
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149 ses.kexstate.sentnewkeys = 1;
165
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150 TRACE(("SENTNEWKEYS=1"))
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151 }
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152
165
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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
165
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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) {
165
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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 */
165
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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 ses.kexstate.donefirstkex = 1;
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172 } else {
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173 TRACE(("RECVNEWKEYS=1"))
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174 ses.kexstate.recvnewkeys = 1;
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175 }
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176
165
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177 TRACE(("leave recv_msg_newkeys"))
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178 }
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179
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180
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181 /* Set up the kex for the first time */
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182 void kexfirstinitialise() {
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183
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184 ses.kexstate.donefirstkex = 0;
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185 kexinitialise();
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186 }
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187
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188 /* Reset the kex state, ready for a new negotiation */
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189 static void kexinitialise() {
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190
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191 struct timeval tv;
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192
165
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193 TRACE(("kexinitialise()"))
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194
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195 /* sent/recv'd MSG_KEXINIT */
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196 ses.kexstate.sentkexinit = 0;
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197 ses.kexstate.recvkexinit = 0;
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198
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199 /* sent/recv'd MSG_NEWKEYS */
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200 ses.kexstate.recvnewkeys = 0;
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201 ses.kexstate.sentnewkeys = 0;
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202
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203 /* first_packet_follows */
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204 ses.kexstate.firstfollows = 0;
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205
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206 ses.kexstate.datatrans = 0;
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207 ses.kexstate.datarecv = 0;
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208
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209 if (gettimeofday(&tv, 0) < 0) {
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210 dropbear_exit("Error getting time");
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211 }
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212 ses.kexstate.lastkextime = tv.tv_sec;
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213
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214 }
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215
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216 /* Helper function for gen_new_keys, creates a hash. It makes a copy of the
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217 * already initialised hash_state hs, which should already have processed
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218 * the dh_K and hash, since these are common. X is the letter 'A', 'B' etc.
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219 * out must have at least min(SHA1_HASH_SIZE, outlen) bytes allocated.
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220 * The output will only be expanded once, since that is all that is required
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221 * (for 3DES and SHA, with 24 and 20 bytes respectively).
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222 *
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223 * See Section 5.2 of the IETF secsh Transport Draft for details */
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224
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225 /* Duplicated verbatim from kex.c --mihnea */
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226 static void hashkeys(unsigned char *out, int outlen,
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227 const hash_state * hs, const unsigned char X) {
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228
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229 hash_state hs2;
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230 unsigned char k2[SHA1_HASH_SIZE]; /* used to extending */
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231
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232 memcpy(&hs2, hs, sizeof(hash_state));
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233 sha1_process(&hs2, &X, 1);
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234 sha1_process(&hs2, ses.session_id, SHA1_HASH_SIZE);
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235 sha1_done(&hs2, out);
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236 if (SHA1_HASH_SIZE < outlen) {
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237 /* need to extend */
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238 memcpy(&hs2, hs, sizeof(hash_state));
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239 sha1_process(&hs2, out, SHA1_HASH_SIZE);
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240 sha1_done(&hs2, k2);
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241 memcpy(&out[SHA1_HASH_SIZE], k2, outlen - SHA1_HASH_SIZE);
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242 }
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243 }
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244
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245 /* Generate the actual encryption/integrity keys, using the results of the
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246 * key exchange, as specified in section 5.2 of the IETF secsh-transport
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247 * draft. This occurs after the DH key-exchange.
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248 *
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249 * ses.newkeys is the new set of keys which are generated, these are only
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250 * taken into use after both sides have sent a newkeys message */
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251
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252 /* Originally from kex.c, generalized for cli/svr mode --mihnea */
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253 void gen_new_keys() {
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254
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255 unsigned char C2S_IV[MAX_IV_LEN];
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256 unsigned char C2S_key[MAX_KEY_LEN];
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257 unsigned char S2C_IV[MAX_IV_LEN];
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258 unsigned char S2C_key[MAX_KEY_LEN];
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259 /* unsigned char key[MAX_KEY_LEN]; */
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260 unsigned char *trans_IV, *trans_key, *recv_IV, *recv_key;
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261
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262 hash_state hs;
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263 unsigned int C2S_keysize, S2C_keysize;
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264 char mactransletter, macrecvletter; /* Client or server specific */
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265
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266 TRACE(("enter gen_new_keys"))
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267 /* the dh_K and hash are the start of all hashes, we make use of that */
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268
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269 sha1_init(&hs);
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270 sha1_process_mp(&hs, ses.dh_K);
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271 mp_clear(ses.dh_K);
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272 m_free(ses.dh_K);
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273 sha1_process(&hs, ses.hash, SHA1_HASH_SIZE);
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274 m_burn(ses.hash, SHA1_HASH_SIZE);
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275
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276 if (IS_DROPBEAR_CLIENT) {
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277 trans_IV = C2S_IV;
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278 recv_IV = S2C_IV;
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279 trans_key = C2S_key;
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280 recv_key = S2C_key;
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281 C2S_keysize = ses.newkeys->trans_algo_crypt->keysize;
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282 S2C_keysize = ses.newkeys->recv_algo_crypt->keysize;
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283 mactransletter = 'E';
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284 macrecvletter = 'F';
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285 } else {
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286 trans_IV = S2C_IV;
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287 recv_IV = C2S_IV;
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288 trans_key = S2C_key;
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289 recv_key = C2S_key;
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290 C2S_keysize = ses.newkeys->recv_algo_crypt->keysize;
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291 S2C_keysize = ses.newkeys->trans_algo_crypt->keysize;
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292 mactransletter = 'F';
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293 macrecvletter = 'E';
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294 }
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295
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296 hashkeys(C2S_IV, SHA1_HASH_SIZE, &hs, 'A');
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297 hashkeys(S2C_IV, SHA1_HASH_SIZE, &hs, 'B');
4
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298 hashkeys(C2S_key, C2S_keysize, &hs, 'C');
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299 hashkeys(S2C_key, S2C_keysize, &hs, 'D');
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300
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301 if (cbc_start(
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302 find_cipher(ses.newkeys->recv_algo_crypt->cipherdesc->name),
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303 recv_IV, recv_key,
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304 ses.newkeys->recv_algo_crypt->keysize, 0,
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305 &ses.newkeys->recv_symmetric_struct) != CRYPT_OK) {
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306 dropbear_exit("crypto error");
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307 }
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308
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309 if (cbc_start(
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310 find_cipher(ses.newkeys->trans_algo_crypt->cipherdesc->name),
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311 trans_IV, trans_key,
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312 ses.newkeys->trans_algo_crypt->keysize, 0,
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313 &ses.newkeys->trans_symmetric_struct) != CRYPT_OK) {
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314 dropbear_exit("crypto error");
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315 }
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316
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317 /* MAC keys */
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318 hashkeys(ses.newkeys->transmackey,
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319 ses.newkeys->trans_algo_mac->keysize, &hs, mactransletter);
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320 hashkeys(ses.newkeys->recvmackey,
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321 ses.newkeys->recv_algo_mac->keysize, &hs, macrecvletter);
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322
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323 #ifndef DISABLE_ZLIB
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324 gen_new_zstreams();
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325 #endif
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326
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327 /* Switch over to the new keys */
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328 m_burn(ses.keys, sizeof(struct key_context));
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329 m_free(ses.keys);
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330 ses.keys = ses.newkeys;
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331 ses.newkeys = NULL;
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332
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333 TRACE(("leave gen_new_keys"))
4
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334 }
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335
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336 #ifndef DISABLE_ZLIB
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337 /* Set up new zlib compression streams, close the old ones. Only
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338 * called from gen_new_keys() */
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339 static void gen_new_zstreams() {
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340
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341 /* create new zstreams */
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342 if (ses.newkeys->recv_algo_comp == DROPBEAR_COMP_ZLIB) {
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343 ses.newkeys->recv_zstream = (z_streamp)m_malloc(sizeof(z_stream));
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344 ses.newkeys->recv_zstream->zalloc = Z_NULL;
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345 ses.newkeys->recv_zstream->zfree = Z_NULL;
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346
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347 if (inflateInit(ses.newkeys->recv_zstream) != Z_OK) {
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348 dropbear_exit("zlib error");
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349 }
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350 } else {
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351 ses.newkeys->recv_zstream = NULL;
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352 }
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353
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354 if (ses.newkeys->trans_algo_comp == DROPBEAR_COMP_ZLIB) {
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355 ses.newkeys->trans_zstream = (z_streamp)m_malloc(sizeof(z_stream));
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356 ses.newkeys->trans_zstream->zalloc = Z_NULL;
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357 ses.newkeys->trans_zstream->zfree = Z_NULL;
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358
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359 if (deflateInit(ses.newkeys->trans_zstream, Z_DEFAULT_COMPRESSION)
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360 != Z_OK) {
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361 dropbear_exit("zlib error");
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362 }
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363 } else {
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364 ses.newkeys->trans_zstream = NULL;
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365 }
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366
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diff changeset
367 /* clean up old keys */
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368 if (ses.keys->recv_zstream != NULL) {
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369 if (inflateEnd(ses.keys->recv_zstream) == Z_STREAM_ERROR) {
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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->recv_zstream);
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374 }
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375 if (ses.keys->trans_zstream != NULL) {
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376 if (deflateEnd(ses.keys->trans_zstream) == Z_STREAM_ERROR) {
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377 /* Z_DATA_ERROR is ok, just means that stream isn't ended */
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378 dropbear_exit("crypto error");
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379 }
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380 m_free(ses.keys->trans_zstream);
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381 }
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382 }
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diff changeset
383 #endif
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384
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385
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diff changeset
386 /* Executed upon receiving a kexinit message from the client to initiate
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387 * key exchange. If we haven't already done so, we send the list of our
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388 * preferred algorithms. The client's requested algorithms are processed,
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389 * and we calculate the first portion of the key-exchange-hash for used
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390 * later in the key exchange. No response is sent, as the client should
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diff changeset
391 * initiate the diffie-hellman key exchange */
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392
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393 /* Originally from kex.c, generalized for cli/svr mode --mihnea */
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diff changeset
394 /* Belongs in common_kex.c where it should be moved after review */
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diff changeset
395 void recv_msg_kexinit() {
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396
165
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diff changeset
397 TRACE(("<- KEXINIT"))
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398 TRACE(("enter recv_msg_kexinit"))
4
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399
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diff changeset
400 /* start the kex hash */
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diff changeset
401 ses.kexhashbuf = buf_new(MAX_KEXHASHBUF);
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diff changeset
402
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
403 if (!ses.kexstate.sentkexinit) {
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
404 /* we need to send a kex packet */
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diff changeset
405 send_msg_kexinit();
165
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parents: 116
diff changeset
406 TRACE(("continue recv_msg_kexinit: sent kexinit"))
4
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diff changeset
407 }
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diff changeset
408
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parents:
diff changeset
409
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parents:
diff changeset
410 if (IS_DROPBEAR_CLIENT) {
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diff changeset
411
26
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diff changeset
412 /* read the peer's choice of algos */
33
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diff changeset
413 read_kex_algos();
4
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diff changeset
414
26
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diff changeset
415 /* V_C, the client's version string (CR and NL excluded) */
4
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diff changeset
416 buf_putstring(ses.kexhashbuf,
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diff changeset
417 (unsigned char*)LOCAL_IDENT, strlen(LOCAL_IDENT));
26
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418 /* V_S, the server's version string (CR and NL excluded) */
4
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diff changeset
419 buf_putstring(ses.kexhashbuf,
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parents:
diff changeset
420 ses.remoteident, strlen((char*)ses.remoteident));
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diff changeset
421
26
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diff changeset
422 /* I_C, the payload of the client's SSH_MSG_KEXINIT */
4
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diff changeset
423 buf_putstring(ses.kexhashbuf,
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diff changeset
424 buf_getptr(ses.transkexinit, ses.transkexinit->len),
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diff changeset
425 ses.transkexinit->len);
26
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diff changeset
426 /* I_S, the payload of the server's SSH_MSG_KEXINIT */
4
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diff changeset
427 buf_setpos(ses.payload, 0);
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parents:
diff changeset
428 buf_putstring(ses.kexhashbuf,
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parents:
diff changeset
429 buf_getptr(ses.payload, ses.payload->len),
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diff changeset
430 ses.payload->len);
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431
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432 } else {
26
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diff changeset
433 /* SERVER */
4
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diff changeset
434
26
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diff changeset
435 /* read the peer's choice of algos */
33
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parents: 26
diff changeset
436 read_kex_algos();
26
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diff changeset
437 /* V_C, the client's version string (CR and NL excluded) */
4
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diff changeset
438 buf_putstring(ses.kexhashbuf,
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diff changeset
439 ses.remoteident, strlen((char*)ses.remoteident));
26
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diff changeset
440 /* V_S, the server's version string (CR and NL excluded) */
4
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parents:
diff changeset
441 buf_putstring(ses.kexhashbuf,
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
442 (unsigned char*)LOCAL_IDENT, strlen(LOCAL_IDENT));
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
443
26
0969767bca0d snapshot of stuff
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diff changeset
444 /* I_C, the payload of the client's SSH_MSG_KEXINIT */
4
fe6bca95afa7 Makefile.in contains updated files required
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parents:
diff changeset
445 buf_setpos(ses.payload, 0);
fe6bca95afa7 Makefile.in contains updated files required
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parents:
diff changeset
446 buf_putstring(ses.kexhashbuf,
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
447 buf_getptr(ses.payload, ses.payload->len),
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
448 ses.payload->len);
26
0969767bca0d snapshot of stuff
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diff changeset
449 /* I_S, the payload of the server's SSH_MSG_KEXINIT */
4
fe6bca95afa7 Makefile.in contains updated files required
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parents:
diff changeset
450 buf_putstring(ses.kexhashbuf,
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
451 buf_getptr(ses.transkexinit, ses.transkexinit->len),
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
452 ses.transkexinit->len);
26
0969767bca0d snapshot of stuff
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diff changeset
453 ses.requirenext = SSH_MSG_KEXDH_INIT;
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
454 }
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 buf_free(ses.transkexinit);
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
457 ses.transkexinit = NULL;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
458 /* 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
459
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
460 ses.kexstate.recvkexinit = 1;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
461
165
0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
Matt Johnston <matt@ucc.asn.au>
parents: 116
diff changeset
462 TRACE(("leave recv_msg_kexinit"))
4
fe6bca95afa7 Makefile.in contains updated files required
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parents:
diff changeset
463 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
464
26
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parents: 22
diff changeset
465 /* Initialises and generate one side of the diffie-hellman key exchange values.
0969767bca0d snapshot of stuff
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parents: 22
diff changeset
466 * See the ietf-secsh-transport draft, section 6, for details */
84
29a5c7c62350 default initialisers for mp_ints
Matt Johnston <matt@ucc.asn.au>
parents: 79
diff changeset
467 /* dh_pub and dh_priv MUST be already initialised */
26
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parents: 22
diff changeset
468 void gen_kexdh_vals(mp_int *dh_pub, mp_int *dh_priv) {
0969767bca0d snapshot of stuff
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parents: 22
diff changeset
469
84
29a5c7c62350 default initialisers for mp_ints
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parents: 79
diff changeset
470 DEF_MP_INT(dh_p);
29a5c7c62350 default initialisers for mp_ints
Matt Johnston <matt@ucc.asn.au>
parents: 79
diff changeset
471 DEF_MP_INT(dh_q);
29a5c7c62350 default initialisers for mp_ints
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parents: 79
diff changeset
472 DEF_MP_INT(dh_g);
26
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parents: 22
diff changeset
473
165
0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
Matt Johnston <matt@ucc.asn.au>
parents: 116
diff changeset
474 TRACE(("enter send_msg_kexdh_reply"))
26
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parents: 22
diff changeset
475
84
29a5c7c62350 default initialisers for mp_ints
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parents: 79
diff changeset
476 m_mp_init_multi(&dh_g, &dh_p, &dh_q, NULL);
26
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parents: 22
diff changeset
477
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parents: 22
diff changeset
478 /* read the prime and generator*/
188
c9483550701b - refactored random mp_int generation and byte->mp_int code
Matt Johnston <matt@ucc.asn.au>
parents: 179
diff changeset
479 bytes_to_mp(&dh_p, (unsigned char*)dh_p_val, DH_P_LEN);
26
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parents: 22
diff changeset
480
0969767bca0d snapshot of stuff
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parents: 22
diff changeset
481 if (mp_set_int(&dh_g, DH_G_VAL) != MP_OKAY) {
0969767bca0d snapshot of stuff
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parents: 22
diff changeset
482 dropbear_exit("Diffie-Hellman error");
0969767bca0d snapshot of stuff
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parents: 22
diff changeset
483 }
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
484
0969767bca0d snapshot of stuff
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parents: 22
diff changeset
485 /* calculate q = (p-1)/2 */
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
486 /* dh_priv is just a temp var here */
0969767bca0d snapshot of stuff
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parents: 22
diff changeset
487 if (mp_sub_d(&dh_p, 1, dh_priv) != MP_OKAY) {
0969767bca0d snapshot of stuff
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parents: 22
diff changeset
488 dropbear_exit("Diffie-Hellman error");
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
489 }
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
490 if (mp_div_2(dh_priv, &dh_q) != MP_OKAY) {
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
491 dropbear_exit("Diffie-Hellman error");
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
492 }
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
493
188
c9483550701b - refactored random mp_int generation and byte->mp_int code
Matt Johnston <matt@ucc.asn.au>
parents: 179
diff changeset
494 /* Generate a private portion 0 < dh_priv < dh_q */
c9483550701b - refactored random mp_int generation and byte->mp_int code
Matt Johnston <matt@ucc.asn.au>
parents: 179
diff changeset
495 gen_random_mpint(&dh_q, dh_priv);
26
0969767bca0d snapshot of stuff
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parents: 22
diff changeset
496
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
497 /* f = g^y mod p */
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
498 if (mp_exptmod(&dh_g, dh_priv, &dh_p, dh_pub) != MP_OKAY) {
0969767bca0d snapshot of stuff
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parents: 22
diff changeset
499 dropbear_exit("Diffie-Hellman error");
0969767bca0d snapshot of stuff
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parents: 22
diff changeset
500 }
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
501 mp_clear_multi(&dh_g, &dh_p, &dh_q, NULL);
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
502 }
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
503
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
504 /* This function is fairly common between client/server, with some substitution
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
505 * of dh_e/dh_f etc. Hence these arguments:
0969767bca0d snapshot of stuff
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parents: 22
diff changeset
506 * dh_pub_us is 'e' for the client, 'f' for the server. dh_pub_them is
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
507 * vice-versa. dh_priv is the x/y value corresponding to dh_pub_us */
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
508 void kexdh_comb_key(mp_int *dh_pub_us, mp_int *dh_priv, mp_int *dh_pub_them,
0969767bca0d snapshot of stuff
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parents: 22
diff changeset
509 sign_key *hostkey) {
0969767bca0d snapshot of stuff
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parents: 22
diff changeset
510
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
511 mp_int dh_p;
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
512 mp_int *dh_e = NULL, *dh_f = NULL;
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
513 hash_state hs;
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
514
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
515 /* read the prime and generator*/
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
516 mp_init(&dh_p);
188
c9483550701b - refactored random mp_int generation and byte->mp_int code
Matt Johnston <matt@ucc.asn.au>
parents: 179
diff changeset
517 bytes_to_mp(&dh_p, dh_p_val, DH_P_LEN);
26
0969767bca0d snapshot of stuff
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parents: 22
diff changeset
518
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
519 /* Check that dh_pub_them (dh_e or dh_f) is in the range [1, p-1] */
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
520 if (mp_cmp(dh_pub_them, &dh_p) != MP_LT
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
521 || mp_cmp_d(dh_pub_them, 0) != MP_GT) {
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
522 dropbear_exit("Diffie-Hellman error");
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
523 }
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
524
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
525 /* K = e^y mod p = f^x mod p */
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
526 ses.dh_K = (mp_int*)m_malloc(sizeof(mp_int));
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
527 m_mp_init(ses.dh_K);
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
528 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
529 dropbear_exit("Diffie-Hellman error");
0969767bca0d snapshot of stuff
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parents: 22
diff changeset
530 }
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
531
0969767bca0d snapshot of stuff
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parents: 22
diff changeset
532 /* clear no longer needed vars */
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
533 mp_clear_multi(&dh_p, NULL);
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
534
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
535 /* 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
536 * not vice-versaing for client/server */
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
537 if (IS_DROPBEAR_CLIENT) {
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
538 dh_e = dh_pub_us;
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
539 dh_f = dh_pub_them;
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
540 } else {
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
541 dh_e = dh_pub_them;
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
542 dh_f = dh_pub_us;
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
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
545 /* 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
546 /* K_S, the host key */
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
547 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
548 /* e, exchange value sent by the client */
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
549 buf_putmpint(ses.kexhashbuf, dh_e);
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
550 /* f, exchange value sent by the server */
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
551 buf_putmpint(ses.kexhashbuf, dh_f);
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
552 /* K, the shared secret */
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
553 buf_putmpint(ses.kexhashbuf, ses.dh_K);
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
554
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
555 /* calculate the hash H to sign */
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
556 sha1_init(&hs);
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
557 buf_setpos(ses.kexhashbuf, 0);
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
558 sha1_process(&hs, buf_getptr(ses.kexhashbuf, ses.kexhashbuf->len),
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
559 ses.kexhashbuf->len);
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
560 sha1_done(&hs, ses.hash);
35
0ad5fb979f42 set the isserver flag (oops)
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
561
0ad5fb979f42 set the isserver flag (oops)
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
562 buf_burn(ses.kexhashbuf);
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
563 buf_free(ses.kexhashbuf);
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
564 ses.kexhashbuf = NULL;
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
565
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
566 /* first time around, we set the session_id to H */
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
567 if (ses.session_id == NULL) {
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
568 /* create the session_id, this never needs freeing */
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
569 ses.session_id = (unsigned char*)m_malloc(SHA1_HASH_SIZE);
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
570 memcpy(ses.session_id, ses.hash, SHA1_HASH_SIZE);
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
571 }
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
572 }
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
573
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
574 /* 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
575 * algos for the client or server. */
33
f789045062e6 Progressing client support
Matt Johnston <matt@ucc.asn.au>
parents: 26
diff changeset
576 static void read_kex_algos() {
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
577
36
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
578 /* for asymmetry */
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
579 algo_type * c2s_hash_algo = NULL;
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
580 algo_type * s2c_hash_algo = NULL;
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
581 algo_type * c2s_cipher_algo = NULL;
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
582 algo_type * s2c_cipher_algo = NULL;
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
583 algo_type * c2s_comp_algo = NULL;
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
584 algo_type * s2c_comp_algo = NULL;
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
585 /* the generic one */
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
586 algo_type * algo = NULL;
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
587
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
588 /* which algo couldn't match */
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
589 char * erralgo = NULL;
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
590
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
591 int goodguess = 0;
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
592 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
593 true after */
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
594
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
595 buf_incrpos(ses.payload, 16); /* start after the cookie */
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 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
598
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
599 /* kex_algorithms */
33
f789045062e6 Progressing client support
Matt Johnston <matt@ucc.asn.au>
parents: 26
diff changeset
600 algo = ses.buf_match_algo(ses.payload, sshkex, &goodguess);
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
601 allgood &= goodguess;
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
602 if (algo == NULL) {
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
603 erralgo = "kex";
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
604 goto error;
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
605 }
165
0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
Matt Johnston <matt@ucc.asn.au>
parents: 116
diff changeset
606 TRACE(("kex algo %s", algo->name))
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
607 ses.newkeys->algo_kex = algo->val;
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
608
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
609 /* server_host_key_algorithms */
33
f789045062e6 Progressing client support
Matt Johnston <matt@ucc.asn.au>
parents: 26
diff changeset
610 algo = ses.buf_match_algo(ses.payload, sshhostkey, &goodguess);
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
611 allgood &= goodguess;
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
612 if (algo == NULL) {
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
613 erralgo = "hostkey";
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
614 goto error;
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
615 }
165
0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
Matt Johnston <matt@ucc.asn.au>
parents: 116
diff changeset
616 TRACE(("hostkey algo %s", algo->name))
26
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 */
36
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
620 c2s_cipher_algo = ses.buf_match_algo(ses.payload, sshciphers, &goodguess);
116
2010f4119c1a Check for non-matching algos properly
Matt Johnston <matt@ucc.asn.au>
parents: 84
diff changeset
621 if (c2s_cipher_algo == NULL) {
26
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 }
228
5e4110bb753a - Fixed twofish algorithm naming so it actually works.
Matt Johnston <matt@ucc.asn.au>
parents: 227
diff changeset
625 TRACE(("enc c2s is %s", c2s_cipher_algo->name))
26
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 */
36
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
628 s2c_cipher_algo = ses.buf_match_algo(ses.payload, sshciphers, &goodguess);
116
2010f4119c1a Check for non-matching algos properly
Matt Johnston <matt@ucc.asn.au>
parents: 84
diff changeset
629 if (s2c_cipher_algo == NULL) {
26
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 }
228
5e4110bb753a - Fixed twofish algorithm naming so it actually works.
Matt Johnston <matt@ucc.asn.au>
parents: 227
diff changeset
633 TRACE(("enc s2c is %s", s2c_cipher_algo->name))
26
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 */
36
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
636 c2s_hash_algo = ses.buf_match_algo(ses.payload, sshhashes, &goodguess);
116
2010f4119c1a Check for non-matching algos properly
Matt Johnston <matt@ucc.asn.au>
parents: 84
diff changeset
637 if (c2s_hash_algo == NULL) {
26
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 }
228
5e4110bb753a - Fixed twofish algorithm naming so it actually works.
Matt Johnston <matt@ucc.asn.au>
parents: 227
diff changeset
641 TRACE(("hash c2s is %s", c2s_hash_algo->name))
26
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 */
36
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
644 s2c_hash_algo = ses.buf_match_algo(ses.payload, sshhashes, &goodguess);
116
2010f4119c1a Check for non-matching algos properly
Matt Johnston <matt@ucc.asn.au>
parents: 84
diff changeset
645 if (s2c_hash_algo == NULL) {
26
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 }
228
5e4110bb753a - Fixed twofish algorithm naming so it actually works.
Matt Johnston <matt@ucc.asn.au>
parents: 227
diff changeset
649 TRACE(("hash s2c is %s", s2c_hash_algo->name))
26
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 */
36
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
652 c2s_comp_algo = ses.buf_match_algo(ses.payload, sshcompress, &goodguess);
116
2010f4119c1a Check for non-matching algos properly
Matt Johnston <matt@ucc.asn.au>
parents: 84
diff changeset
653 if (c2s_comp_algo == NULL) {
26
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 }
228
5e4110bb753a - Fixed twofish algorithm naming so it actually works.
Matt Johnston <matt@ucc.asn.au>
parents: 227
diff changeset
657 TRACE(("hash c2s is %s", c2s_comp_algo->name))
26
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 */
36
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
660 s2c_comp_algo = ses.buf_match_algo(ses.payload, sshcompress, &goodguess);
116
2010f4119c1a Check for non-matching algos properly
Matt Johnston <matt@ucc.asn.au>
parents: 84
diff changeset
661 if (s2c_comp_algo == NULL) {
26
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 }
228
5e4110bb753a - Fixed twofish algorithm naming so it actually works.
Matt Johnston <matt@ucc.asn.au>
parents: 227
diff changeset
665 TRACE(("hash s2c is %s", s2c_comp_algo->name))
26
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 */
179
161557a9dde8 * fix longstanding bug with connections being closed on failure to
Matt Johnston <matt@ucc.asn.au>
parents: 165
diff changeset
674 if (buf_getbool(ses.payload)) {
26
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
36
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
682 /* Handle the asymmetry */
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
683 if (IS_DROPBEAR_CLIENT) {
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
684 ses.newkeys->recv_algo_crypt =
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
685 (struct dropbear_cipher*)s2c_cipher_algo->data;
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
686 ses.newkeys->trans_algo_crypt =
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
687 (struct dropbear_cipher*)c2s_cipher_algo->data;
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
688 ses.newkeys->recv_algo_mac =
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
689 (struct dropbear_hash*)s2c_hash_algo->data;
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
690 ses.newkeys->trans_algo_mac =
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
691 (struct dropbear_hash*)c2s_hash_algo->data;
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
692 ses.newkeys->recv_algo_comp = s2c_comp_algo->val;
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
693 ses.newkeys->trans_algo_comp = c2s_comp_algo->val;
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
694 } else {
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
695 /* SERVER */
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
696 ses.newkeys->recv_algo_crypt =
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
697 (struct dropbear_cipher*)c2s_cipher_algo->data;
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
698 ses.newkeys->trans_algo_crypt =
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
699 (struct dropbear_cipher*)s2c_cipher_algo->data;
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
700 ses.newkeys->recv_algo_mac =
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
701 (struct dropbear_hash*)c2s_hash_algo->data;
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
702 ses.newkeys->trans_algo_mac =
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
703 (struct dropbear_hash*)s2c_hash_algo->data;
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
704 ses.newkeys->recv_algo_comp = c2s_comp_algo->val;
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
705 ses.newkeys->trans_algo_comp = s2c_comp_algo->val;
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
706 }
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
707
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
708 /* reserved for future extensions */
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
709 buf_getint(ses.payload);
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
710 return;
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
711
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
712 error:
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
713 dropbear_exit("no matching algo %s", erralgo);
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
714 }