annotate common-kex.c @ 580:dd9947170fc8

- fixes for listenaddr
author Matt Johnston <matt@ucc.asn.au>
date Sat, 27 Feb 2010 12:15:27 +0000
parents f9b5dc0cba61
children a98a2138364a
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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 #include "runopts.h"
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38 /* diffie-hellman-group1-sha1 value for p */
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39 static const unsigned char dh_p_val[] = {
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40 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xC9, 0x0F, 0xDA, 0xA2,
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41 0x21, 0x68, 0xC2, 0x34, 0xC4, 0xC6, 0x62, 0x8B, 0x80, 0xDC, 0x1C, 0xD1,
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42 0x29, 0x02, 0x4E, 0x08, 0x8A, 0x67, 0xCC, 0x74, 0x02, 0x0B, 0xBE, 0xA6,
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43 0x3B, 0x13, 0x9B, 0x22, 0x51, 0x4A, 0x08, 0x79, 0x8E, 0x34, 0x04, 0xDD,
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44 0xEF, 0x95, 0x19, 0xB3, 0xCD, 0x3A, 0x43, 0x1B, 0x30, 0x2B, 0x0A, 0x6D,
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45 0xF2, 0x5F, 0x14, 0x37, 0x4F, 0xE1, 0x35, 0x6D, 0x6D, 0x51, 0xC2, 0x45,
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46 0xE4, 0x85, 0xB5, 0x76, 0x62, 0x5E, 0x7E, 0xC6, 0xF4, 0x4C, 0x42, 0xE9,
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47 0xA6, 0x37, 0xED, 0x6B, 0x0B, 0xFF, 0x5C, 0xB6, 0xF4, 0x06, 0xB7, 0xED,
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48 0xEE, 0x38, 0x6B, 0xFB, 0x5A, 0x89, 0x9F, 0xA5, 0xAE, 0x9F, 0x24, 0x11,
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49 0x7C, 0x4B, 0x1F, 0xE6, 0x49, 0x28, 0x66, 0x51, 0xEC, 0xE6, 0x53, 0x81,
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50 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF};
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51 #define DH_P_LEN sizeof(dh_p_val)
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53 static const int DH_G_VAL = 2;
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54
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55 static void kexinitialise();
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56 void gen_new_keys();
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57 #ifndef DISABLE_ZLIB
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58 static void gen_new_zstreams();
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59 #endif
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60 static void read_kex_algos();
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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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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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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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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, ses.compress_algos);
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97 /* compression_algorithms_server_to_client */
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98 buf_put_algolist(ses.writepayload, ses.compress_algos);
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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 */
165
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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 ses.kexstate.donefirstkex = 1;
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149 } else {
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150 ses.kexstate.sentnewkeys = 1;
165
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151 TRACE(("SENTNEWKEYS=1"))
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152 }
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153
165
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154 TRACE(("-> MSG_NEWKEYS"))
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155 TRACE(("leave send_msg_newkeys"))
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156 }
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157
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158 /* Bring the new keys into use after a key exchange */
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159 void recv_msg_newkeys() {
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160
165
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161 TRACE(("<- MSG_NEWKEYS"))
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162 TRACE(("enter recv_msg_newkeys"))
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163
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164 /* simply check if we've sent SSH_MSG_NEWKEYS, and if so,
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165 * switch to the new keys */
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166 if (ses.kexstate.sentnewkeys) {
165
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167 TRACE(("while SENTNEWKEYS=1"))
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168 gen_new_keys();
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169 kexinitialise(); /* we've finished with this kex */
165
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170 TRACE((" -> DATAALLOWED=1"))
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171 ses.dataallowed = 1; /* we can send other packets again now */
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172 ses.kexstate.donefirstkex = 1;
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173 } else {
165
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174 TRACE(("RECVNEWKEYS=1"))
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175 ses.kexstate.recvnewkeys = 1;
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176 }
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177
165
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178 TRACE(("leave recv_msg_newkeys"))
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179 }
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180
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181
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182 /* Set up the kex for the first time */
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183 void kexfirstinitialise() {
575
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184 ses.kexstate.donefirstkex = 0;
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185
575
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186 #ifndef DISABLE_ZLIB
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187 if (opts.enable_compress) {
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188 ses.compress_algos = ssh_compress;
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189 } else
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190 #endif
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191 {
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192 ses.compress_algos = ssh_nocompress;
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193 }
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194 kexinitialise();
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195 }
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196
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197 /* Reset the kex state, ready for a new negotiation */
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198 static void kexinitialise() {
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199
165
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200 TRACE(("kexinitialise()"))
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201
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202 /* sent/recv'd MSG_KEXINIT */
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203 ses.kexstate.sentkexinit = 0;
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204 ses.kexstate.recvkexinit = 0;
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205
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206 /* sent/recv'd MSG_NEWKEYS */
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207 ses.kexstate.recvnewkeys = 0;
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208 ses.kexstate.sentnewkeys = 0;
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209
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210 /* first_packet_follows */
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211 ses.kexstate.firstfollows = 0;
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212
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213 ses.kexstate.datatrans = 0;
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214 ses.kexstate.datarecv = 0;
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215
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216 ses.kexstate.lastkextime = time(NULL);
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217
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218 }
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219
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220 /* Helper function for gen_new_keys, creates a hash. It makes a copy of the
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221 * already initialised hash_state hs, which should already have processed
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222 * the dh_K and hash, since these are common. X is the letter 'A', 'B' etc.
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223 * out must have at least min(SHA1_HASH_SIZE, outlen) bytes allocated.
409
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224 * The output will only be expanded once, as we are assured that
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225 * outlen <= 2*SHA1_HASH_SIZE for all known hashes.
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226 *
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227 * See Section 7.2 of rfc4253 (ssh transport) for details */
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228 static void hashkeys(unsigned char *out, int outlen,
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229 const hash_state * hs, const unsigned char X) {
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230
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231 hash_state hs2;
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232 unsigned char k2[SHA1_HASH_SIZE]; /* used to extending */
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233
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234 memcpy(&hs2, hs, sizeof(hash_state));
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235 sha1_process(&hs2, &X, 1);
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236 sha1_process(&hs2, ses.session_id, SHA1_HASH_SIZE);
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237 sha1_done(&hs2, out);
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238 if (SHA1_HASH_SIZE < outlen) {
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239 /* need to extend */
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240 memcpy(&hs2, hs, sizeof(hash_state));
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241 sha1_process(&hs2, out, SHA1_HASH_SIZE);
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242 sha1_done(&hs2, k2);
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243 memcpy(&out[SHA1_HASH_SIZE], k2, outlen - SHA1_HASH_SIZE);
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244 }
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245 }
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246
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247 /* Generate the actual encryption/integrity keys, using the results of the
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248 * key exchange, as specified in section 5.2 of the IETF secsh-transport
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249 * draft. This occurs after the DH key-exchange.
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250 *
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251 * ses.newkeys is the new set of keys which are generated, these are only
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252 * taken into use after both sides have sent a newkeys message */
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253
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254 /* Originally from kex.c, generalized for cli/svr mode --mihnea */
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255 void gen_new_keys() {
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256
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257 unsigned char C2S_IV[MAX_IV_LEN];
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258 unsigned char C2S_key[MAX_KEY_LEN];
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259 unsigned char S2C_IV[MAX_IV_LEN];
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260 unsigned char S2C_key[MAX_KEY_LEN];
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261 /* unsigned char key[MAX_KEY_LEN]; */
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262 unsigned char *trans_IV, *trans_key, *recv_IV, *recv_key;
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263
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264 hash_state hs;
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265 unsigned int C2S_keysize, S2C_keysize;
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266 char mactransletter, macrecvletter; /* Client or server specific */
342
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267 int recv_cipher = 0, trans_cipher = 0;
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268
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269 TRACE(("enter gen_new_keys"))
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270 /* the dh_K and hash are the start of all hashes, we make use of that */
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271
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272 sha1_init(&hs);
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273 sha1_process_mp(&hs, ses.dh_K);
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274 mp_clear(ses.dh_K);
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275 m_free(ses.dh_K);
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276 sha1_process(&hs, ses.hash, SHA1_HASH_SIZE);
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277 m_burn(ses.hash, SHA1_HASH_SIZE);
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278
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279 if (IS_DROPBEAR_CLIENT) {
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280 trans_IV = C2S_IV;
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281 recv_IV = S2C_IV;
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282 trans_key = C2S_key;
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283 recv_key = S2C_key;
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284 C2S_keysize = ses.newkeys->trans.algo_crypt->keysize;
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285 S2C_keysize = ses.newkeys->recv.algo_crypt->keysize;
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286 mactransletter = 'E';
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287 macrecvletter = 'F';
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288 } else {
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289 trans_IV = S2C_IV;
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290 recv_IV = C2S_IV;
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291 trans_key = S2C_key;
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292 recv_key = C2S_key;
534
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diff changeset
293 C2S_keysize = ses.newkeys->recv.algo_crypt->keysize;
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294 S2C_keysize = ses.newkeys->trans.algo_crypt->keysize;
4
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295 mactransletter = 'F';
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296 macrecvletter = 'E';
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297 }
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298
35
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diff changeset
299 hashkeys(C2S_IV, SHA1_HASH_SIZE, &hs, 'A');
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diff changeset
300 hashkeys(S2C_IV, SHA1_HASH_SIZE, &hs, 'B');
4
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301 hashkeys(C2S_key, C2S_keysize, &hs, 'C');
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302 hashkeys(S2C_key, S2C_keysize, &hs, 'D');
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303
534
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diff changeset
304 recv_cipher = find_cipher(ses.newkeys->recv.algo_crypt->cipherdesc->name);
342
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parents: 257
diff changeset
305 if (recv_cipher < 0)
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diff changeset
306 dropbear_exit("crypto error");
534
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parents: 502
diff changeset
307 if (ses.newkeys->recv.crypt_mode->start(recv_cipher,
502
43bbe17d6ba0 - Add Counter Mode support
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diff changeset
308 recv_IV, recv_key,
534
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diff changeset
309 ses.newkeys->recv.algo_crypt->keysize, 0,
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diff changeset
310 &ses.newkeys->recv.cipher_state) != CRYPT_OK) {
4
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diff changeset
311 dropbear_exit("crypto error");
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312 }
502
43bbe17d6ba0 - Add Counter Mode support
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313
534
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parents: 502
diff changeset
314 trans_cipher = find_cipher(ses.newkeys->trans.algo_crypt->cipherdesc->name);
342
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parents: 257
diff changeset
315 if (trans_cipher < 0)
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diff changeset
316 dropbear_exit("crypto error");
534
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parents: 502
diff changeset
317 if (ses.newkeys->trans.crypt_mode->start(trans_cipher,
502
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diff changeset
318 trans_IV, trans_key,
534
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diff changeset
319 ses.newkeys->trans.algo_crypt->keysize, 0,
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diff changeset
320 &ses.newkeys->trans.cipher_state) != CRYPT_OK) {
4
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321 dropbear_exit("crypto error");
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322 }
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323
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324 /* MAC keys */
534
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parents: 502
diff changeset
325 hashkeys(ses.newkeys->trans.mackey,
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parents: 502
diff changeset
326 ses.newkeys->trans.algo_mac->keysize, &hs, mactransletter);
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parents: 502
diff changeset
327 hashkeys(ses.newkeys->recv.mackey,
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parents: 502
diff changeset
328 ses.newkeys->recv.algo_mac->keysize, &hs, macrecvletter);
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parents: 502
diff changeset
329 ses.newkeys->trans.hash_index = find_hash(ses.newkeys->trans.algo_mac->hashdesc->name),
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parents: 502
diff changeset
330 ses.newkeys->recv.hash_index = find_hash(ses.newkeys->recv.algo_mac->hashdesc->name),
4
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331
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332 #ifndef DISABLE_ZLIB
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333 gen_new_zstreams();
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diff changeset
334 #endif
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335
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diff changeset
336 /* Switch over to the new keys */
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diff changeset
337 m_burn(ses.keys, sizeof(struct key_context));
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diff changeset
338 m_free(ses.keys);
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diff changeset
339 ses.keys = ses.newkeys;
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340 ses.newkeys = NULL;
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341
165
0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
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parents: 116
diff changeset
342 TRACE(("leave gen_new_keys"))
4
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343 }
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344
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345 #ifndef DISABLE_ZLIB
501
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diff changeset
346
d58c478bd399 Add support for [email protected] delayed compression.
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parents: 454
diff changeset
347 int is_compress_trans() {
534
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
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parents: 502
diff changeset
348 return ses.keys->trans.algo_comp == DROPBEAR_COMP_ZLIB
501
d58c478bd399 Add support for [email protected] delayed compression.
Matt Johnston <matt@ucc.asn.au>
parents: 454
diff changeset
349 || (ses.authstate.authdone
534
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
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parents: 502
diff changeset
350 && ses.keys->trans.algo_comp == DROPBEAR_COMP_ZLIB_DELAY);
501
d58c478bd399 Add support for [email protected] delayed compression.
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parents: 454
diff changeset
351 }
d58c478bd399 Add support for [email protected] delayed compression.
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diff changeset
352
d58c478bd399 Add support for [email protected] delayed compression.
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parents: 454
diff changeset
353 int is_compress_recv() {
534
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents: 502
diff changeset
354 return ses.keys->recv.algo_comp == DROPBEAR_COMP_ZLIB
501
d58c478bd399 Add support for [email protected] delayed compression.
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parents: 454
diff changeset
355 || (ses.authstate.authdone
534
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
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parents: 502
diff changeset
356 && ses.keys->recv.algo_comp == DROPBEAR_COMP_ZLIB_DELAY);
501
d58c478bd399 Add support for [email protected] delayed compression.
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parents: 454
diff changeset
357 }
d58c478bd399 Add support for [email protected] delayed compression.
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parents: 454
diff changeset
358
4
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diff changeset
359 /* Set up new zlib compression streams, close the old ones. Only
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parents:
diff changeset
360 * called from gen_new_keys() */
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parents:
diff changeset
361 static void gen_new_zstreams() {
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parents:
diff changeset
362
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parents:
diff changeset
363 /* create new zstreams */
534
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents: 502
diff changeset
364 if (ses.newkeys->recv.algo_comp == DROPBEAR_COMP_ZLIB
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents: 502
diff changeset
365 || ses.newkeys->recv.algo_comp == DROPBEAR_COMP_ZLIB_DELAY) {
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents: 502
diff changeset
366 ses.newkeys->recv.zstream = (z_streamp)m_malloc(sizeof(z_stream));
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents: 502
diff changeset
367 ses.newkeys->recv.zstream->zalloc = Z_NULL;
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents: 502
diff changeset
368 ses.newkeys->recv.zstream->zfree = Z_NULL;
4
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diff changeset
369
534
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
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parents: 502
diff changeset
370 if (inflateInit(ses.newkeys->recv.zstream) != Z_OK) {
4
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parents:
diff changeset
371 dropbear_exit("zlib error");
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
372 }
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diff changeset
373 } else {
534
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents: 502
diff changeset
374 ses.newkeys->recv.zstream = NULL;
4
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375 }
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diff changeset
376
534
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
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parents: 502
diff changeset
377 if (ses.newkeys->trans.algo_comp == DROPBEAR_COMP_ZLIB
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents: 502
diff changeset
378 || ses.newkeys->trans.algo_comp == DROPBEAR_COMP_ZLIB_DELAY) {
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents: 502
diff changeset
379 ses.newkeys->trans.zstream = (z_streamp)m_malloc(sizeof(z_stream));
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents: 502
diff changeset
380 ses.newkeys->trans.zstream->zalloc = Z_NULL;
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents: 502
diff changeset
381 ses.newkeys->trans.zstream->zfree = Z_NULL;
4
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parents:
diff changeset
382
555
daf52f813328 - Add option to change zlib windowBits/memLevel
Matt Johnston <matt@ucc.asn.au>
parents: 534
diff changeset
383 if (deflateInit2(ses.newkeys->trans.zstream, Z_DEFAULT_COMPRESSION,
daf52f813328 - Add option to change zlib windowBits/memLevel
Matt Johnston <matt@ucc.asn.au>
parents: 534
diff changeset
384 Z_DEFLATED, DROPBEAR_ZLIB_WINDOW_BITS,
daf52f813328 - Add option to change zlib windowBits/memLevel
Matt Johnston <matt@ucc.asn.au>
parents: 534
diff changeset
385 DROPBEAR_ZLIB_MEM_LEVEL, Z_DEFAULT_STRATEGY)
4
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parents:
diff changeset
386 != Z_OK) {
fe6bca95afa7 Makefile.in contains updated files required
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parents:
diff changeset
387 dropbear_exit("zlib error");
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parents:
diff changeset
388 }
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diff changeset
389 } else {
534
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents: 502
diff changeset
390 ses.newkeys->trans.zstream = NULL;
4
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diff changeset
391 }
501
d58c478bd399 Add support for [email protected] delayed compression.
Matt Johnston <matt@ucc.asn.au>
parents: 454
diff changeset
392
4
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parents:
diff changeset
393 /* clean up old keys */
534
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents: 502
diff changeset
394 if (ses.keys->recv.zstream != NULL) {
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents: 502
diff changeset
395 if (inflateEnd(ses.keys->recv.zstream) == Z_STREAM_ERROR) {
4
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
396 /* 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
397 dropbear_exit("crypto error");
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
398 }
534
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents: 502
diff changeset
399 m_free(ses.keys->recv.zstream);
4
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
400 }
534
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents: 502
diff changeset
401 if (ses.keys->trans.zstream != NULL) {
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents: 502
diff changeset
402 if (deflateEnd(ses.keys->trans.zstream) == Z_STREAM_ERROR) {
4
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
403 /* 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
404 dropbear_exit("crypto error");
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
405 }
534
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents: 502
diff changeset
406 m_free(ses.keys->trans.zstream);
4
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
407 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
408 }
501
d58c478bd399 Add support for [email protected] delayed compression.
Matt Johnston <matt@ucc.asn.au>
parents: 454
diff changeset
409 #endif /* DISABLE_ZLIB */
4
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parents:
diff changeset
410
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
411
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
412 /* Executed upon receiving a kexinit message from the client to initiate
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
413 * 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
414 * 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
415 * 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
416 * 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
417 * initiate the diffie-hellman key exchange */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
418
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
419 /* Originally from kex.c, generalized for cli/svr mode --mihnea */
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
420 /* Belongs in common_kex.c where it should be moved after review */
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
421 void recv_msg_kexinit() {
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
422
257
63601217f5ab * options.h, common-kex.c: fix support of 4096 byte host keys
Matt Johnston <matt@ucc.asn.au>
parents: 228
diff changeset
423 unsigned int kexhashbuf_len = 0;
63601217f5ab * options.h, common-kex.c: fix support of 4096 byte host keys
Matt Johnston <matt@ucc.asn.au>
parents: 228
diff changeset
424 unsigned int remote_ident_len = 0;
63601217f5ab * options.h, common-kex.c: fix support of 4096 byte host keys
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parents: 228
diff changeset
425 unsigned int local_ident_len = 0;
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diff changeset
426
165
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diff changeset
427 TRACE(("<- KEXINIT"))
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428 TRACE(("enter recv_msg_kexinit"))
4
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429
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diff changeset
430 if (!ses.kexstate.sentkexinit) {
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diff changeset
431 /* we need to send a kex packet */
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diff changeset
432 send_msg_kexinit();
165
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diff changeset
433 TRACE(("continue recv_msg_kexinit: sent kexinit"))
4
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434 }
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435
257
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diff changeset
436 /* start the kex hash */
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diff changeset
437 local_ident_len = strlen(LOCAL_IDENT);
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diff changeset
438 remote_ident_len = strlen((char*)ses.remoteident);
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diff changeset
439
63601217f5ab * options.h, common-kex.c: fix support of 4096 byte host keys
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diff changeset
440 kexhashbuf_len = local_ident_len + remote_ident_len
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diff changeset
441 + ses.transkexinit->len + ses.payload->len
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diff changeset
442 + KEXHASHBUF_MAX_INTS;
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parents: 228
diff changeset
443
63601217f5ab * options.h, common-kex.c: fix support of 4096 byte host keys
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diff changeset
444 ses.kexhashbuf = buf_new(kexhashbuf_len);
4
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diff changeset
445
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diff changeset
446 if (IS_DROPBEAR_CLIENT) {
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diff changeset
447
26
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diff changeset
448 /* read the peer's choice of algos */
33
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diff changeset
449 read_kex_algos();
4
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450
26
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diff changeset
451 /* V_C, the client's version string (CR and NL excluded) */
4
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diff changeset
452 buf_putstring(ses.kexhashbuf,
257
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diff changeset
453 (unsigned char*)LOCAL_IDENT, local_ident_len);
26
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diff changeset
454 /* V_S, the server's version string (CR and NL excluded) */
257
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diff changeset
455 buf_putstring(ses.kexhashbuf, ses.remoteident, remote_ident_len);
4
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456
26
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diff changeset
457 /* I_C, the payload of the client's SSH_MSG_KEXINIT */
4
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diff changeset
458 buf_putstring(ses.kexhashbuf,
257
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diff changeset
459 ses.transkexinit->data, ses.transkexinit->len);
26
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diff changeset
460 /* I_S, the payload of the server's SSH_MSG_KEXINIT */
4
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461 buf_setpos(ses.payload, 0);
257
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diff changeset
462 buf_putstring(ses.kexhashbuf, ses.payload->data, ses.payload->len);
4
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463
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464 } else {
26
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diff changeset
465 /* SERVER */
4
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466
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467 /* read the peer's choice of algos */
33
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diff changeset
468 read_kex_algos();
26
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diff changeset
469 /* V_C, the client's version string (CR and NL excluded) */
257
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diff changeset
470 buf_putstring(ses.kexhashbuf, ses.remoteident, remote_ident_len);
26
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471 /* V_S, the server's version string (CR and NL excluded) */
257
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diff changeset
472 buf_putstring(ses.kexhashbuf,
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diff changeset
473 (unsigned char*)LOCAL_IDENT, local_ident_len);
4
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diff changeset
474
26
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diff changeset
475 /* I_C, the payload of the client's SSH_MSG_KEXINIT */
4
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diff changeset
476 buf_setpos(ses.payload, 0);
257
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diff changeset
477 buf_putstring(ses.kexhashbuf, ses.payload->data, ses.payload->len);
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diff changeset
478
26
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diff changeset
479 /* I_S, the payload of the server's SSH_MSG_KEXINIT */
4
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diff changeset
480 buf_putstring(ses.kexhashbuf,
257
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parents: 228
diff changeset
481 ses.transkexinit->data, ses.transkexinit->len);
63601217f5ab * options.h, common-kex.c: fix support of 4096 byte host keys
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diff changeset
482
26
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diff changeset
483 ses.requirenext = SSH_MSG_KEXDH_INIT;
4
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diff changeset
484 }
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diff changeset
485
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diff changeset
486 buf_free(ses.transkexinit);
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parents:
diff changeset
487 ses.transkexinit = NULL;
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diff changeset
488 /* the rest of ses.kexhashbuf will be done after DH exchange */
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diff changeset
489
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Matt Johnston <matt@ucc.asn.au>
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diff changeset
490 ses.kexstate.recvkexinit = 1;
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diff changeset
491
165
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diff changeset
492 TRACE(("leave recv_msg_kexinit"))
4
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493 }
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diff changeset
494
26
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diff changeset
495 /* Initialises and generate one side of the diffie-hellman key exchange values.
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diff changeset
496 * See the ietf-secsh-transport draft, section 6, for details */
84
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diff changeset
497 /* dh_pub and dh_priv MUST be already initialised */
26
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diff changeset
498 void gen_kexdh_vals(mp_int *dh_pub, mp_int *dh_priv) {
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diff changeset
499
84
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diff changeset
500 DEF_MP_INT(dh_p);
29a5c7c62350 default initialisers for mp_ints
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diff changeset
501 DEF_MP_INT(dh_q);
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diff changeset
502 DEF_MP_INT(dh_g);
26
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diff changeset
503
165
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diff changeset
504 TRACE(("enter send_msg_kexdh_reply"))
26
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diff changeset
505
84
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diff changeset
506 m_mp_init_multi(&dh_g, &dh_p, &dh_q, NULL);
26
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diff changeset
507
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diff changeset
508 /* read the prime and generator*/
188
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diff changeset
509 bytes_to_mp(&dh_p, (unsigned char*)dh_p_val, DH_P_LEN);
26
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diff changeset
510
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diff changeset
511 if (mp_set_int(&dh_g, DH_G_VAL) != MP_OKAY) {
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diff changeset
512 dropbear_exit("Diffie-Hellman error");
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diff changeset
513 }
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diff changeset
514
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diff changeset
515 /* calculate q = (p-1)/2 */
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diff changeset
516 /* dh_priv is just a temp var here */
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diff changeset
517 if (mp_sub_d(&dh_p, 1, dh_priv) != MP_OKAY) {
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diff changeset
518 dropbear_exit("Diffie-Hellman error");
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parents: 22
diff changeset
519 }
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diff changeset
520 if (mp_div_2(dh_priv, &dh_q) != MP_OKAY) {
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diff changeset
521 dropbear_exit("Diffie-Hellman error");
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diff changeset
522 }
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diff changeset
523
188
c9483550701b - refactored random mp_int generation and byte->mp_int code
Matt Johnston <matt@ucc.asn.au>
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diff changeset
524 /* Generate a private portion 0 < dh_priv < dh_q */
c9483550701b - refactored random mp_int generation and byte->mp_int code
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diff changeset
525 gen_random_mpint(&dh_q, dh_priv);
26
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diff changeset
526
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diff changeset
527 /* f = g^y mod p */
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diff changeset
528 if (mp_exptmod(&dh_g, dh_priv, &dh_p, dh_pub) != MP_OKAY) {
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parents: 22
diff changeset
529 dropbear_exit("Diffie-Hellman error");
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diff changeset
530 }
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diff changeset
531 mp_clear_multi(&dh_g, &dh_p, &dh_q, NULL);
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diff changeset
532 }
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diff changeset
533
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diff changeset
534 /* This function is fairly common between client/server, with some substitution
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diff changeset
535 * of dh_e/dh_f etc. Hence these arguments:
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parents: 22
diff changeset
536 * dh_pub_us is 'e' for the client, 'f' for the server. dh_pub_them is
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diff changeset
537 * vice-versa. dh_priv is the x/y value corresponding to dh_pub_us */
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diff changeset
538 void kexdh_comb_key(mp_int *dh_pub_us, mp_int *dh_priv, mp_int *dh_pub_them,
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diff changeset
539 sign_key *hostkey) {
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diff changeset
540
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diff changeset
541 mp_int dh_p;
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diff changeset
542 mp_int *dh_e = NULL, *dh_f = NULL;
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diff changeset
543 hash_state hs;
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diff changeset
544
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diff changeset
545 /* read the prime and generator*/
342
3e098639b05f From Erik Hovland
Matt Johnston <matt@ucc.asn.au>
parents: 257
diff changeset
546 m_mp_init(&dh_p);
188
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parents: 179
diff changeset
547 bytes_to_mp(&dh_p, dh_p_val, DH_P_LEN);
26
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diff changeset
548
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diff changeset
549 /* Check that dh_pub_them (dh_e or dh_f) is in the range [1, p-1] */
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parents: 22
diff changeset
550 if (mp_cmp(dh_pub_them, &dh_p) != MP_LT
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parents: 22
diff changeset
551 || mp_cmp_d(dh_pub_them, 0) != MP_GT) {
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diff changeset
552 dropbear_exit("Diffie-Hellman error");
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diff changeset
553 }
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diff changeset
554
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diff changeset
555 /* K = e^y mod p = f^x mod p */
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diff changeset
556 ses.dh_K = (mp_int*)m_malloc(sizeof(mp_int));
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diff changeset
557 m_mp_init(ses.dh_K);
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diff changeset
558 if (mp_exptmod(dh_pub_them, dh_priv, &dh_p, ses.dh_K) != MP_OKAY) {
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diff changeset
559 dropbear_exit("Diffie-Hellman error");
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diff changeset
560 }
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parents: 22
diff changeset
561
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parents: 22
diff changeset
562 /* clear no longer needed vars */
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parents: 22
diff changeset
563 mp_clear_multi(&dh_p, NULL);
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diff changeset
564
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diff changeset
565 /* From here on, the code needs to work with the _same_ vars on each side,
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parents: 22
diff changeset
566 * not vice-versaing for client/server */
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parents: 22
diff changeset
567 if (IS_DROPBEAR_CLIENT) {
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parents: 22
diff changeset
568 dh_e = dh_pub_us;
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parents: 22
diff changeset
569 dh_f = dh_pub_them;
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Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
570 } else {
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
571 dh_e = dh_pub_them;
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
572 dh_f = dh_pub_us;
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
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
575 /* 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
576 /* K_S, the host key */
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
577 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
578 /* e, exchange value sent by the client */
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
579 buf_putmpint(ses.kexhashbuf, dh_e);
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
580 /* f, exchange value sent by the server */
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
581 buf_putmpint(ses.kexhashbuf, dh_f);
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
582 /* K, the shared secret */
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
583 buf_putmpint(ses.kexhashbuf, ses.dh_K);
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
584
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
585 /* calculate the hash H to sign */
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
586 sha1_init(&hs);
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
587 buf_setpos(ses.kexhashbuf, 0);
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
588 sha1_process(&hs, buf_getptr(ses.kexhashbuf, ses.kexhashbuf->len),
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
589 ses.kexhashbuf->len);
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
590 sha1_done(&hs, ses.hash);
35
0ad5fb979f42 set the isserver flag (oops)
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
591
0ad5fb979f42 set the isserver flag (oops)
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
592 buf_burn(ses.kexhashbuf);
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
593 buf_free(ses.kexhashbuf);
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
594 ses.kexhashbuf = NULL;
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
595
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
596 /* first time around, we set the session_id to H */
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
597 if (ses.session_id == NULL) {
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
598 /* create the session_id, this never needs freeing */
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
599 ses.session_id = (unsigned char*)m_malloc(SHA1_HASH_SIZE);
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
600 memcpy(ses.session_id, ses.hash, SHA1_HASH_SIZE);
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
601 }
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
602 }
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
603
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
604 /* 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
605 * algos for the client or server. */
33
f789045062e6 Progressing client support
Matt Johnston <matt@ucc.asn.au>
parents: 26
diff changeset
606 static void read_kex_algos() {
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
607
36
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
608 /* for asymmetry */
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
609 algo_type * c2s_hash_algo = NULL;
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
610 algo_type * s2c_hash_algo = NULL;
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
611 algo_type * c2s_cipher_algo = NULL;
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
612 algo_type * s2c_cipher_algo = NULL;
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
613 algo_type * c2s_comp_algo = NULL;
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
614 algo_type * s2c_comp_algo = NULL;
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
615 /* the generic one */
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
616 algo_type * algo = NULL;
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
617
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
618 /* which algo couldn't match */
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
619 char * erralgo = NULL;
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
620
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
621 int goodguess = 0;
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
622 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
623 true after */
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
624
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
625 buf_incrpos(ses.payload, 16); /* start after the cookie */
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 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
628
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
629 /* kex_algorithms */
33
f789045062e6 Progressing client support
Matt Johnston <matt@ucc.asn.au>
parents: 26
diff changeset
630 algo = ses.buf_match_algo(ses.payload, sshkex, &goodguess);
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
631 allgood &= goodguess;
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
632 if (algo == NULL) {
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
633 erralgo = "kex";
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
634 goto error;
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
635 }
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
636 TRACE(("kex algo %s", algo->name))
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
637 ses.newkeys->algo_kex = algo->val;
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
638
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
639 /* server_host_key_algorithms */
33
f789045062e6 Progressing client support
Matt Johnston <matt@ucc.asn.au>
parents: 26
diff changeset
640 algo = ses.buf_match_algo(ses.payload, sshhostkey, &goodguess);
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
641 allgood &= goodguess;
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
642 if (algo == NULL) {
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
643 erralgo = "hostkey";
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
644 goto error;
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
645 }
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
646 TRACE(("hostkey algo %s", algo->name))
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
647 ses.newkeys->algo_hostkey = algo->val;
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
648
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
649 /* encryption_algorithms_client_to_server */
36
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
650 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
651 if (c2s_cipher_algo == NULL) {
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
652 erralgo = "enc c->s";
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
653 goto error;
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
654 }
228
5e4110bb753a - Fixed twofish algorithm naming so it actually works.
Matt Johnston <matt@ucc.asn.au>
parents: 227
diff changeset
655 TRACE(("enc c2s is %s", c2s_cipher_algo->name))
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
656
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
657 /* encryption_algorithms_server_to_client */
36
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
658 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
659 if (s2c_cipher_algo == NULL) {
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
660 erralgo = "enc s->c";
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
661 goto error;
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
662 }
228
5e4110bb753a - Fixed twofish algorithm naming so it actually works.
Matt Johnston <matt@ucc.asn.au>
parents: 227
diff changeset
663 TRACE(("enc s2c is %s", s2c_cipher_algo->name))
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
664
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
665 /* mac_algorithms_client_to_server */
36
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
666 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
667 if (c2s_hash_algo == NULL) {
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
668 erralgo = "mac c->s";
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
669 goto error;
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
670 }
228
5e4110bb753a - Fixed twofish algorithm naming so it actually works.
Matt Johnston <matt@ucc.asn.au>
parents: 227
diff changeset
671 TRACE(("hash c2s is %s", c2s_hash_algo->name))
26
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 /* mac_algorithms_server_to_client */
36
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
674 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
675 if (s2c_hash_algo == NULL) {
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
676 erralgo = "mac s->c";
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
677 goto error;
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
678 }
228
5e4110bb753a - Fixed twofish algorithm naming so it actually works.
Matt Johnston <matt@ucc.asn.au>
parents: 227
diff changeset
679 TRACE(("hash s2c is %s", s2c_hash_algo->name))
26
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 /* compression_algorithms_client_to_server */
575
f9b5dc0cba61 - Disable compression for non-final multihops
Matt Johnston <matt@ucc.asn.au>
parents: 555
diff changeset
682 c2s_comp_algo = ses.buf_match_algo(ses.payload, ses.compress_algos, &goodguess);
116
2010f4119c1a Check for non-matching algos properly
Matt Johnston <matt@ucc.asn.au>
parents: 84
diff changeset
683 if (c2s_comp_algo == NULL) {
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
684 erralgo = "comp c->s";
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
685 goto error;
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
686 }
228
5e4110bb753a - Fixed twofish algorithm naming so it actually works.
Matt Johnston <matt@ucc.asn.au>
parents: 227
diff changeset
687 TRACE(("hash c2s is %s", c2s_comp_algo->name))
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
688
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
689 /* compression_algorithms_server_to_client */
575
f9b5dc0cba61 - Disable compression for non-final multihops
Matt Johnston <matt@ucc.asn.au>
parents: 555
diff changeset
690 s2c_comp_algo = ses.buf_match_algo(ses.payload, ses.compress_algos, &goodguess);
116
2010f4119c1a Check for non-matching algos properly
Matt Johnston <matt@ucc.asn.au>
parents: 84
diff changeset
691 if (s2c_comp_algo == NULL) {
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
692 erralgo = "comp s->c";
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
693 goto error;
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
694 }
228
5e4110bb753a - Fixed twofish algorithm naming so it actually works.
Matt Johnston <matt@ucc.asn.au>
parents: 227
diff changeset
695 TRACE(("hash s2c is %s", s2c_comp_algo->name))
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
696
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
697 /* languages_client_to_server */
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
698 buf_eatstring(ses.payload);
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
699
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
700 /* languages_server_to_client */
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
701 buf_eatstring(ses.payload);
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
702
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
703 /* 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
704 if (buf_getbool(ses.payload)) {
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
705 ses.kexstate.firstfollows = 1;
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
706 /* 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
707 if (!allgood) {
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
708 ses.ignorenext = 1;
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
709 }
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
710 }
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
711
36
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
712 /* Handle the asymmetry */
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
713 if (IS_DROPBEAR_CLIENT) {
534
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents: 502
diff changeset
714 ses.newkeys->recv.algo_crypt =
36
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
715 (struct dropbear_cipher*)s2c_cipher_algo->data;
534
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents: 502
diff changeset
716 ses.newkeys->trans.algo_crypt =
36
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
717 (struct dropbear_cipher*)c2s_cipher_algo->data;
534
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents: 502
diff changeset
718 ses.newkeys->recv.crypt_mode =
502
43bbe17d6ba0 - Add Counter Mode support
Matt Johnston <matt@ucc.asn.au>
parents: 501
diff changeset
719 (struct dropbear_cipher_mode*)s2c_cipher_algo->mode;
534
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents: 502
diff changeset
720 ses.newkeys->trans.crypt_mode =
502
43bbe17d6ba0 - Add Counter Mode support
Matt Johnston <matt@ucc.asn.au>
parents: 501
diff changeset
721 (struct dropbear_cipher_mode*)c2s_cipher_algo->mode;
534
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents: 502
diff changeset
722 ses.newkeys->recv.algo_mac =
36
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
723 (struct dropbear_hash*)s2c_hash_algo->data;
534
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents: 502
diff changeset
724 ses.newkeys->trans.algo_mac =
36
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
725 (struct dropbear_hash*)c2s_hash_algo->data;
534
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents: 502
diff changeset
726 ses.newkeys->recv.algo_comp = s2c_comp_algo->val;
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents: 502
diff changeset
727 ses.newkeys->trans.algo_comp = c2s_comp_algo->val;
36
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
728 } else {
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
729 /* SERVER */
534
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents: 502
diff changeset
730 ses.newkeys->recv.algo_crypt =
36
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
731 (struct dropbear_cipher*)c2s_cipher_algo->data;
534
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents: 502
diff changeset
732 ses.newkeys->trans.algo_crypt =
36
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
733 (struct dropbear_cipher*)s2c_cipher_algo->data;
534
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents: 502
diff changeset
734 ses.newkeys->recv.crypt_mode =
502
43bbe17d6ba0 - Add Counter Mode support
Matt Johnston <matt@ucc.asn.au>
parents: 501
diff changeset
735 (struct dropbear_cipher_mode*)c2s_cipher_algo->mode;
534
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents: 502
diff changeset
736 ses.newkeys->trans.crypt_mode =
502
43bbe17d6ba0 - Add Counter Mode support
Matt Johnston <matt@ucc.asn.au>
parents: 501
diff changeset
737 (struct dropbear_cipher_mode*)s2c_cipher_algo->mode;
534
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents: 502
diff changeset
738 ses.newkeys->recv.algo_mac =
36
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
739 (struct dropbear_hash*)c2s_hash_algo->data;
534
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents: 502
diff changeset
740 ses.newkeys->trans.algo_mac =
36
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
741 (struct dropbear_hash*)s2c_hash_algo->data;
534
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents: 502
diff changeset
742 ses.newkeys->recv.algo_comp = c2s_comp_algo->val;
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents: 502
diff changeset
743 ses.newkeys->trans.algo_comp = s2c_comp_algo->val;
36
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
744 }
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
745
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
746 /* reserved for future extensions */
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
747 buf_getint(ses.payload);
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
748 return;
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
749
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
750 error:
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
751 dropbear_exit("no matching algo %s", erralgo);
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
752 }