annotate common-kex.c @ 567:893a9dd0b9dd

- set $SSH_TTY environment variable - remove extraneous (crash causing) printf()
author Matt Johnston <matt@ucc.asn.au>
date Mon, 31 Aug 2009 15:25:39 +0000
parents daf52f813328
children f9b5dc0cba61
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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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75 /* kex algos */
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76 buf_put_algolist(ses.writepayload, sshkex);
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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;
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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 TRACE(("kexinitialise()"))
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192
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193 /* sent/recv'd MSG_KEXINIT */
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194 ses.kexstate.sentkexinit = 0;
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195 ses.kexstate.recvkexinit = 0;
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196
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197 /* sent/recv'd MSG_NEWKEYS */
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198 ses.kexstate.recvnewkeys = 0;
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199 ses.kexstate.sentnewkeys = 0;
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200
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201 /* first_packet_follows */
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202 ses.kexstate.firstfollows = 0;
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203
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204 ses.kexstate.datatrans = 0;
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205 ses.kexstate.datarecv = 0;
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206
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207 ses.kexstate.lastkextime = time(NULL);
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208
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209 }
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210
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211 /* Helper function for gen_new_keys, creates a hash. It makes a copy of the
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212 * already initialised hash_state hs, which should already have processed
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213 * the dh_K and hash, since these are common. X is the letter 'A', 'B' etc.
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214 * out must have at least min(SHA1_HASH_SIZE, outlen) bytes allocated.
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215 * The output will only be expanded once, as we are assured that
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216 * outlen <= 2*SHA1_HASH_SIZE for all known hashes.
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217 *
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218 * See Section 7.2 of rfc4253 (ssh transport) for details */
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219 static void hashkeys(unsigned char *out, int outlen,
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220 const hash_state * hs, const unsigned char X) {
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221
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222 hash_state hs2;
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223 unsigned char k2[SHA1_HASH_SIZE]; /* used to extending */
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224
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225 memcpy(&hs2, hs, sizeof(hash_state));
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226 sha1_process(&hs2, &X, 1);
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227 sha1_process(&hs2, ses.session_id, SHA1_HASH_SIZE);
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228 sha1_done(&hs2, out);
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229 if (SHA1_HASH_SIZE < outlen) {
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230 /* need to extend */
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231 memcpy(&hs2, hs, sizeof(hash_state));
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232 sha1_process(&hs2, out, SHA1_HASH_SIZE);
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233 sha1_done(&hs2, k2);
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234 memcpy(&out[SHA1_HASH_SIZE], k2, outlen - SHA1_HASH_SIZE);
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235 }
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236 }
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237
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238 /* Generate the actual encryption/integrity keys, using the results of the
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239 * key exchange, as specified in section 5.2 of the IETF secsh-transport
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240 * draft. This occurs after the DH key-exchange.
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241 *
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242 * ses.newkeys is the new set of keys which are generated, these are only
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243 * taken into use after both sides have sent a newkeys message */
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244
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245 /* Originally from kex.c, generalized for cli/svr mode --mihnea */
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246 void gen_new_keys() {
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247
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248 unsigned char C2S_IV[MAX_IV_LEN];
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249 unsigned char C2S_key[MAX_KEY_LEN];
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250 unsigned char S2C_IV[MAX_IV_LEN];
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251 unsigned char S2C_key[MAX_KEY_LEN];
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252 /* unsigned char key[MAX_KEY_LEN]; */
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253 unsigned char *trans_IV, *trans_key, *recv_IV, *recv_key;
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254
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255 hash_state hs;
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256 unsigned int C2S_keysize, S2C_keysize;
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257 char mactransletter, macrecvletter; /* Client or server specific */
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258 int recv_cipher = 0, trans_cipher = 0;
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259
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260 TRACE(("enter gen_new_keys"))
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261 /* the dh_K and hash are the start of all hashes, we make use of that */
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262
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263 sha1_init(&hs);
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264 sha1_process_mp(&hs, ses.dh_K);
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265 mp_clear(ses.dh_K);
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266 m_free(ses.dh_K);
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267 sha1_process(&hs, ses.hash, SHA1_HASH_SIZE);
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268 m_burn(ses.hash, SHA1_HASH_SIZE);
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269
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270 if (IS_DROPBEAR_CLIENT) {
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271 trans_IV = C2S_IV;
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272 recv_IV = S2C_IV;
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273 trans_key = C2S_key;
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274 recv_key = S2C_key;
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275 C2S_keysize = ses.newkeys->trans.algo_crypt->keysize;
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276 S2C_keysize = ses.newkeys->recv.algo_crypt->keysize;
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277 mactransletter = 'E';
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278 macrecvletter = 'F';
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279 } else {
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280 trans_IV = S2C_IV;
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281 recv_IV = C2S_IV;
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282 trans_key = S2C_key;
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283 recv_key = C2S_key;
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284 C2S_keysize = ses.newkeys->recv.algo_crypt->keysize;
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285 S2C_keysize = ses.newkeys->trans.algo_crypt->keysize;
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286 mactransletter = 'F';
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287 macrecvletter = 'E';
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288 }
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289
35
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diff changeset
290 hashkeys(C2S_IV, SHA1_HASH_SIZE, &hs, 'A');
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diff changeset
291 hashkeys(S2C_IV, SHA1_HASH_SIZE, &hs, 'B');
4
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292 hashkeys(C2S_key, C2S_keysize, &hs, 'C');
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293 hashkeys(S2C_key, S2C_keysize, &hs, 'D');
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294
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diff changeset
295 recv_cipher = find_cipher(ses.newkeys->recv.algo_crypt->cipherdesc->name);
342
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diff changeset
296 if (recv_cipher < 0)
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diff changeset
297 dropbear_exit("crypto error");
534
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diff changeset
298 if (ses.newkeys->recv.crypt_mode->start(recv_cipher,
502
43bbe17d6ba0 - Add Counter Mode support
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diff changeset
299 recv_IV, recv_key,
534
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diff changeset
300 ses.newkeys->recv.algo_crypt->keysize, 0,
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diff changeset
301 &ses.newkeys->recv.cipher_state) != CRYPT_OK) {
4
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302 dropbear_exit("crypto error");
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303 }
502
43bbe17d6ba0 - Add Counter Mode support
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parents: 501
diff changeset
304
534
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parents: 502
diff changeset
305 trans_cipher = find_cipher(ses.newkeys->trans.algo_crypt->cipherdesc->name);
342
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parents: 257
diff changeset
306 if (trans_cipher < 0)
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diff changeset
307 dropbear_exit("crypto error");
534
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parents: 502
diff changeset
308 if (ses.newkeys->trans.crypt_mode->start(trans_cipher,
502
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diff changeset
309 trans_IV, trans_key,
534
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diff changeset
310 ses.newkeys->trans.algo_crypt->keysize, 0,
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diff changeset
311 &ses.newkeys->trans.cipher_state) != CRYPT_OK) {
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312 dropbear_exit("crypto error");
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313 }
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314
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315 /* MAC keys */
534
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parents: 502
diff changeset
316 hashkeys(ses.newkeys->trans.mackey,
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parents: 502
diff changeset
317 ses.newkeys->trans.algo_mac->keysize, &hs, mactransletter);
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diff changeset
318 hashkeys(ses.newkeys->recv.mackey,
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parents: 502
diff changeset
319 ses.newkeys->recv.algo_mac->keysize, &hs, macrecvletter);
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parents: 502
diff changeset
320 ses.newkeys->trans.hash_index = find_hash(ses.newkeys->trans.algo_mac->hashdesc->name),
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parents: 502
diff changeset
321 ses.newkeys->recv.hash_index = find_hash(ses.newkeys->recv.algo_mac->hashdesc->name),
4
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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
165
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diff changeset
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
501
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diff changeset
337
d58c478bd399 Add support for [email protected] delayed compression.
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diff changeset
338 int is_compress_trans() {
534
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parents: 502
diff changeset
339 return ses.keys->trans.algo_comp == DROPBEAR_COMP_ZLIB
501
d58c478bd399 Add support for [email protected] delayed compression.
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parents: 454
diff changeset
340 || (ses.authstate.authdone
534
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
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parents: 502
diff changeset
341 && 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
342 }
d58c478bd399 Add support for [email protected] delayed compression.
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diff changeset
343
d58c478bd399 Add support for [email protected] delayed compression.
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parents: 454
diff changeset
344 int is_compress_recv() {
534
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
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parents: 502
diff changeset
345 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
346 || (ses.authstate.authdone
534
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parents: 502
diff changeset
347 && 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
348 }
d58c478bd399 Add support for [email protected] delayed compression.
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diff changeset
349
4
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350 /* Set up new zlib compression streams, close the old ones. Only
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diff changeset
351 * called from gen_new_keys() */
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diff changeset
352 static void gen_new_zstreams() {
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353
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354 /* create new zstreams */
534
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
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parents: 502
diff changeset
355 if (ses.newkeys->recv.algo_comp == DROPBEAR_COMP_ZLIB
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
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parents: 502
diff changeset
356 || 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
357 ses.newkeys->recv.zstream = (z_streamp)m_malloc(sizeof(z_stream));
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parents: 502
diff changeset
358 ses.newkeys->recv.zstream->zalloc = Z_NULL;
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
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parents: 502
diff changeset
359 ses.newkeys->recv.zstream->zfree = Z_NULL;
4
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360
534
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
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parents: 502
diff changeset
361 if (inflateInit(ses.newkeys->recv.zstream) != Z_OK) {
4
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362 dropbear_exit("zlib error");
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diff changeset
363 }
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364 } else {
534
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
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diff changeset
365 ses.newkeys->recv.zstream = NULL;
4
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366 }
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367
534
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parents: 502
diff changeset
368 if (ses.newkeys->trans.algo_comp == DROPBEAR_COMP_ZLIB
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
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parents: 502
diff changeset
369 || ses.newkeys->trans.algo_comp == DROPBEAR_COMP_ZLIB_DELAY) {
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
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parents: 502
diff changeset
370 ses.newkeys->trans.zstream = (z_streamp)m_malloc(sizeof(z_stream));
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parents: 502
diff changeset
371 ses.newkeys->trans.zstream->zalloc = Z_NULL;
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
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parents: 502
diff changeset
372 ses.newkeys->trans.zstream->zfree = Z_NULL;
4
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373
555
daf52f813328 - Add option to change zlib windowBits/memLevel
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parents: 534
diff changeset
374 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
375 Z_DEFLATED, DROPBEAR_ZLIB_WINDOW_BITS,
daf52f813328 - Add option to change zlib windowBits/memLevel
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parents: 534
diff changeset
376 DROPBEAR_ZLIB_MEM_LEVEL, Z_DEFAULT_STRATEGY)
4
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diff changeset
377 != Z_OK) {
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diff changeset
378 dropbear_exit("zlib error");
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diff changeset
379 }
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380 } else {
534
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
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parents: 502
diff changeset
381 ses.newkeys->trans.zstream = NULL;
4
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diff changeset
382 }
501
d58c478bd399 Add support for [email protected] delayed compression.
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parents: 454
diff changeset
383
4
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diff changeset
384 /* clean up old keys */
534
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
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parents: 502
diff changeset
385 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
386 if (inflateEnd(ses.keys->recv.zstream) == Z_STREAM_ERROR) {
4
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parents:
diff changeset
387 /* Z_DATA_ERROR is ok, just means that stream isn't ended */
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diff changeset
388 dropbear_exit("crypto error");
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diff changeset
389 }
534
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
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parents: 502
diff changeset
390 m_free(ses.keys->recv.zstream);
4
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diff changeset
391 }
534
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
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parents: 502
diff changeset
392 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
393 if (deflateEnd(ses.keys->trans.zstream) == Z_STREAM_ERROR) {
4
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parents:
diff changeset
394 /* Z_DATA_ERROR is ok, just means that stream isn't ended */
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parents:
diff changeset
395 dropbear_exit("crypto error");
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diff changeset
396 }
534
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents: 502
diff changeset
397 m_free(ses.keys->trans.zstream);
4
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parents:
diff changeset
398 }
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parents:
diff changeset
399 }
501
d58c478bd399 Add support for [email protected] delayed compression.
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parents: 454
diff changeset
400 #endif /* DISABLE_ZLIB */
4
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diff changeset
401
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parents:
diff changeset
402
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
403 /* Executed upon receiving a kexinit message from the client to initiate
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parents:
diff changeset
404 * key exchange. If we haven't already done so, we send the list of our
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
405 * preferred algorithms. The client's requested algorithms are processed,
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
406 * 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
407 * 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
408 * initiate the diffie-hellman key exchange */
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
409
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
410 /* Originally from kex.c, generalized for cli/svr mode --mihnea */
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
411 /* 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
412 void recv_msg_kexinit() {
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parents:
diff changeset
413
257
63601217f5ab * options.h, common-kex.c: fix support of 4096 byte host keys
Matt Johnston <matt@ucc.asn.au>
parents: 228
diff changeset
414 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
415 unsigned int remote_ident_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
416 unsigned int local_ident_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
417
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
418 TRACE(("<- KEXINIT"))
0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
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parents: 116
diff changeset
419 TRACE(("enter recv_msg_kexinit"))
4
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parents:
diff changeset
420
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
421 if (!ses.kexstate.sentkexinit) {
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parents:
diff changeset
422 /* we need to send a kex packet */
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parents:
diff changeset
423 send_msg_kexinit();
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
424 TRACE(("continue recv_msg_kexinit: sent kexinit"))
4
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425 }
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426
257
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diff changeset
427 /* start the kex hash */
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428 local_ident_len = strlen(LOCAL_IDENT);
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429 remote_ident_len = strlen((char*)ses.remoteident);
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diff changeset
430
63601217f5ab * options.h, common-kex.c: fix support of 4096 byte host keys
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diff changeset
431 kexhashbuf_len = local_ident_len + remote_ident_len
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diff changeset
432 + ses.transkexinit->len + ses.payload->len
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diff changeset
433 + KEXHASHBUF_MAX_INTS;
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diff changeset
434
63601217f5ab * options.h, common-kex.c: fix support of 4096 byte host keys
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diff changeset
435 ses.kexhashbuf = buf_new(kexhashbuf_len);
4
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436
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437 if (IS_DROPBEAR_CLIENT) {
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438
26
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diff changeset
439 /* read the peer's choice of algos */
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diff changeset
440 read_kex_algos();
4
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441
26
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442 /* V_C, the client's version string (CR and NL excluded) */
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443 buf_putstring(ses.kexhashbuf,
257
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diff changeset
444 (unsigned char*)LOCAL_IDENT, local_ident_len);
26
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445 /* V_S, the server's version string (CR and NL excluded) */
257
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diff changeset
446 buf_putstring(ses.kexhashbuf, ses.remoteident, remote_ident_len);
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447
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448 /* I_C, the payload of the client's SSH_MSG_KEXINIT */
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449 buf_putstring(ses.kexhashbuf,
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diff changeset
450 ses.transkexinit->data, ses.transkexinit->len);
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451 /* I_S, the payload of the server's SSH_MSG_KEXINIT */
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452 buf_setpos(ses.payload, 0);
257
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453 buf_putstring(ses.kexhashbuf, ses.payload->data, ses.payload->len);
4
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454
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455 } else {
26
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456 /* SERVER */
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457
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458 /* read the peer's choice of algos */
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diff changeset
459 read_kex_algos();
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460 /* V_C, the client's version string (CR and NL excluded) */
257
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diff changeset
461 buf_putstring(ses.kexhashbuf, ses.remoteident, remote_ident_len);
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462 /* V_S, the server's version string (CR and NL excluded) */
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463 buf_putstring(ses.kexhashbuf,
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diff changeset
464 (unsigned char*)LOCAL_IDENT, local_ident_len);
4
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465
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466 /* I_C, the payload of the client's SSH_MSG_KEXINIT */
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467 buf_setpos(ses.payload, 0);
257
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468 buf_putstring(ses.kexhashbuf, ses.payload->data, ses.payload->len);
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diff changeset
469
26
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470 /* I_S, the payload of the server's SSH_MSG_KEXINIT */
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471 buf_putstring(ses.kexhashbuf,
257
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diff changeset
472 ses.transkexinit->data, ses.transkexinit->len);
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473
26
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diff changeset
474 ses.requirenext = SSH_MSG_KEXDH_INIT;
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475 }
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476
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477 buf_free(ses.transkexinit);
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478 ses.transkexinit = NULL;
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diff changeset
479 /* the rest of ses.kexhashbuf will be done after DH exchange */
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diff changeset
480
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diff changeset
481 ses.kexstate.recvkexinit = 1;
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diff changeset
482
165
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diff changeset
483 TRACE(("leave recv_msg_kexinit"))
4
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484 }
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diff changeset
485
26
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diff changeset
486 /* Initialises and generate one side of the diffie-hellman key exchange values.
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diff changeset
487 * See the ietf-secsh-transport draft, section 6, for details */
84
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diff changeset
488 /* dh_pub and dh_priv MUST be already initialised */
26
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489 void gen_kexdh_vals(mp_int *dh_pub, mp_int *dh_priv) {
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diff changeset
490
84
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diff changeset
491 DEF_MP_INT(dh_p);
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diff changeset
492 DEF_MP_INT(dh_q);
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diff changeset
493 DEF_MP_INT(dh_g);
26
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diff changeset
494
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diff changeset
495 TRACE(("enter send_msg_kexdh_reply"))
26
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diff changeset
496
84
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diff changeset
497 m_mp_init_multi(&dh_g, &dh_p, &dh_q, NULL);
26
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diff changeset
498
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diff changeset
499 /* read the prime and generator*/
188
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diff changeset
500 bytes_to_mp(&dh_p, (unsigned char*)dh_p_val, DH_P_LEN);
26
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501
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diff changeset
502 if (mp_set_int(&dh_g, DH_G_VAL) != MP_OKAY) {
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diff changeset
503 dropbear_exit("Diffie-Hellman error");
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diff changeset
504 }
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diff changeset
505
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diff changeset
506 /* calculate q = (p-1)/2 */
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diff changeset
507 /* dh_priv is just a temp var here */
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diff changeset
508 if (mp_sub_d(&dh_p, 1, dh_priv) != MP_OKAY) {
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diff changeset
509 dropbear_exit("Diffie-Hellman error");
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diff changeset
510 }
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diff changeset
511 if (mp_div_2(dh_priv, &dh_q) != MP_OKAY) {
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diff changeset
512 dropbear_exit("Diffie-Hellman error");
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513 }
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diff changeset
514
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diff changeset
515 /* Generate a private portion 0 < dh_priv < dh_q */
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diff changeset
516 gen_random_mpint(&dh_q, dh_priv);
26
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diff changeset
517
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diff changeset
518 /* f = g^y mod p */
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diff changeset
519 if (mp_exptmod(&dh_g, dh_priv, &dh_p, dh_pub) != MP_OKAY) {
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diff changeset
520 dropbear_exit("Diffie-Hellman error");
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diff changeset
521 }
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diff changeset
522 mp_clear_multi(&dh_g, &dh_p, &dh_q, NULL);
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diff changeset
523 }
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diff changeset
524
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diff changeset
525 /* This function is fairly common between client/server, with some substitution
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diff changeset
526 * of dh_e/dh_f etc. Hence these arguments:
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diff changeset
527 * dh_pub_us is 'e' for the client, 'f' for the server. dh_pub_them is
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diff changeset
528 * vice-versa. dh_priv is the x/y value corresponding to dh_pub_us */
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diff changeset
529 void kexdh_comb_key(mp_int *dh_pub_us, mp_int *dh_priv, mp_int *dh_pub_them,
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diff changeset
530 sign_key *hostkey) {
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diff changeset
531
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diff changeset
532 mp_int dh_p;
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diff changeset
533 mp_int *dh_e = NULL, *dh_f = NULL;
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diff changeset
534 hash_state hs;
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parents: 22
diff changeset
535
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diff changeset
536 /* read the prime and generator*/
342
3e098639b05f From Erik Hovland
Matt Johnston <matt@ucc.asn.au>
parents: 257
diff changeset
537 m_mp_init(&dh_p);
188
c9483550701b - refactored random mp_int generation and byte->mp_int code
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parents: 179
diff changeset
538 bytes_to_mp(&dh_p, dh_p_val, DH_P_LEN);
26
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diff changeset
539
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diff changeset
540 /* 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
541 if (mp_cmp(dh_pub_them, &dh_p) != MP_LT
0969767bca0d snapshot of stuff
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parents: 22
diff changeset
542 || mp_cmp_d(dh_pub_them, 0) != MP_GT) {
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parents: 22
diff changeset
543 dropbear_exit("Diffie-Hellman error");
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parents: 22
diff changeset
544 }
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diff changeset
545
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parents: 22
diff changeset
546 /* K = e^y mod p = f^x mod p */
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parents: 22
diff changeset
547 ses.dh_K = (mp_int*)m_malloc(sizeof(mp_int));
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parents: 22
diff changeset
548 m_mp_init(ses.dh_K);
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diff changeset
549 if (mp_exptmod(dh_pub_them, dh_priv, &dh_p, ses.dh_K) != MP_OKAY) {
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parents: 22
diff changeset
550 dropbear_exit("Diffie-Hellman error");
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parents: 22
diff changeset
551 }
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parents: 22
diff changeset
552
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diff changeset
553 /* clear no longer needed vars */
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parents: 22
diff changeset
554 mp_clear_multi(&dh_p, NULL);
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diff changeset
555
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parents: 22
diff changeset
556 /* From here on, the code needs to work with the _same_ vars on each side,
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parents: 22
diff changeset
557 * not vice-versaing for client/server */
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parents: 22
diff changeset
558 if (IS_DROPBEAR_CLIENT) {
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diff changeset
559 dh_e = dh_pub_us;
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diff changeset
560 dh_f = dh_pub_them;
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diff changeset
561 } else {
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diff changeset
562 dh_e = dh_pub_them;
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parents: 22
diff changeset
563 dh_f = dh_pub_us;
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diff changeset
564 }
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diff changeset
565
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parents: 22
diff changeset
566 /* Create the remainder of the hash buffer, to generate the exchange hash */
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parents: 22
diff changeset
567 /* K_S, the host key */
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diff changeset
568 buf_put_pub_key(ses.kexhashbuf, hostkey, ses.newkeys->algo_hostkey);
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parents: 22
diff changeset
569 /* e, exchange value sent by the client */
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parents: 22
diff changeset
570 buf_putmpint(ses.kexhashbuf, dh_e);
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parents: 22
diff changeset
571 /* f, exchange value sent by the server */
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
572 buf_putmpint(ses.kexhashbuf, dh_f);
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
573 /* K, the shared secret */
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
574 buf_putmpint(ses.kexhashbuf, ses.dh_K);
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
575
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
576 /* calculate the hash H to sign */
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
577 sha1_init(&hs);
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
578 buf_setpos(ses.kexhashbuf, 0);
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
579 sha1_process(&hs, buf_getptr(ses.kexhashbuf, ses.kexhashbuf->len),
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
580 ses.kexhashbuf->len);
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
581 sha1_done(&hs, ses.hash);
35
0ad5fb979f42 set the isserver flag (oops)
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
582
0ad5fb979f42 set the isserver flag (oops)
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
583 buf_burn(ses.kexhashbuf);
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
584 buf_free(ses.kexhashbuf);
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
585 ses.kexhashbuf = NULL;
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
586
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
587 /* first time around, we set the session_id to H */
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
588 if (ses.session_id == NULL) {
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
589 /* create the session_id, this never needs freeing */
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
590 ses.session_id = (unsigned char*)m_malloc(SHA1_HASH_SIZE);
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
591 memcpy(ses.session_id, ses.hash, SHA1_HASH_SIZE);
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
592 }
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
593 }
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 /* 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
596 * algos for the client or server. */
33
f789045062e6 Progressing client support
Matt Johnston <matt@ucc.asn.au>
parents: 26
diff changeset
597 static void read_kex_algos() {
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
598
36
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
599 /* for asymmetry */
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
600 algo_type * c2s_hash_algo = NULL;
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
601 algo_type * s2c_hash_algo = NULL;
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
602 algo_type * c2s_cipher_algo = NULL;
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
603 algo_type * s2c_cipher_algo = NULL;
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
604 algo_type * c2s_comp_algo = NULL;
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
605 algo_type * s2c_comp_algo = NULL;
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
606 /* the generic one */
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
607 algo_type * algo = NULL;
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
608
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
609 /* which algo couldn't match */
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
610 char * erralgo = NULL;
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
611
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
612 int goodguess = 0;
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
613 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
614 true after */
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
615
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
616 buf_incrpos(ses.payload, 16); /* start after the cookie */
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
617
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
618 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
619
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
620 /* kex_algorithms */
33
f789045062e6 Progressing client support
Matt Johnston <matt@ucc.asn.au>
parents: 26
diff changeset
621 algo = ses.buf_match_algo(ses.payload, sshkex, &goodguess);
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
622 allgood &= goodguess;
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
623 if (algo == NULL) {
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
624 erralgo = "kex";
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
625 goto error;
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
626 }
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
627 TRACE(("kex algo %s", algo->name))
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
628 ses.newkeys->algo_kex = algo->val;
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
629
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
630 /* server_host_key_algorithms */
33
f789045062e6 Progressing client support
Matt Johnston <matt@ucc.asn.au>
parents: 26
diff changeset
631 algo = ses.buf_match_algo(ses.payload, sshhostkey, &goodguess);
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
632 allgood &= goodguess;
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
633 if (algo == NULL) {
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
634 erralgo = "hostkey";
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
635 goto error;
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
636 }
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
637 TRACE(("hostkey algo %s", algo->name))
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
638 ses.newkeys->algo_hostkey = algo->val;
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
639
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
640 /* encryption_algorithms_client_to_server */
36
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
641 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
642 if (c2s_cipher_algo == NULL) {
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
643 erralgo = "enc c->s";
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 }
228
5e4110bb753a - Fixed twofish algorithm naming so it actually works.
Matt Johnston <matt@ucc.asn.au>
parents: 227
diff changeset
646 TRACE(("enc c2s is %s", c2s_cipher_algo->name))
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
647
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
648 /* encryption_algorithms_server_to_client */
36
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
649 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
650 if (s2c_cipher_algo == NULL) {
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
651 erralgo = "enc s->c";
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
652 goto error;
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
653 }
228
5e4110bb753a - Fixed twofish algorithm naming so it actually works.
Matt Johnston <matt@ucc.asn.au>
parents: 227
diff changeset
654 TRACE(("enc s2c is %s", s2c_cipher_algo->name))
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
655
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
656 /* mac_algorithms_client_to_server */
36
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
657 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
658 if (c2s_hash_algo == NULL) {
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
659 erralgo = "mac c->s";
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
660 goto error;
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
661 }
228
5e4110bb753a - Fixed twofish algorithm naming so it actually works.
Matt Johnston <matt@ucc.asn.au>
parents: 227
diff changeset
662 TRACE(("hash c2s is %s", c2s_hash_algo->name))
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
663
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
664 /* mac_algorithms_server_to_client */
36
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
665 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
666 if (s2c_hash_algo == NULL) {
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
667 erralgo = "mac s->c";
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
668 goto error;
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
669 }
228
5e4110bb753a - Fixed twofish algorithm naming so it actually works.
Matt Johnston <matt@ucc.asn.au>
parents: 227
diff changeset
670 TRACE(("hash s2c is %s", s2c_hash_algo->name))
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
671
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
672 /* compression_algorithms_client_to_server */
36
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
673 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
674 if (c2s_comp_algo == NULL) {
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
675 erralgo = "comp c->s";
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
676 goto error;
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
677 }
228
5e4110bb753a - Fixed twofish algorithm naming so it actually works.
Matt Johnston <matt@ucc.asn.au>
parents: 227
diff changeset
678 TRACE(("hash c2s is %s", c2s_comp_algo->name))
26
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 /* compression_algorithms_server_to_client */
36
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
681 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
682 if (s2c_comp_algo == NULL) {
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
683 erralgo = "comp s->c";
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
684 goto error;
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
685 }
228
5e4110bb753a - Fixed twofish algorithm naming so it actually works.
Matt Johnston <matt@ucc.asn.au>
parents: 227
diff changeset
686 TRACE(("hash s2c is %s", s2c_comp_algo->name))
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
687
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
688 /* languages_client_to_server */
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
689 buf_eatstring(ses.payload);
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
690
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
691 /* languages_server_to_client */
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
692 buf_eatstring(ses.payload);
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
693
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
694 /* 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
695 if (buf_getbool(ses.payload)) {
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
696 ses.kexstate.firstfollows = 1;
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
697 /* 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
698 if (!allgood) {
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
699 ses.ignorenext = 1;
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
700 }
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
701 }
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
702
36
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
703 /* Handle the asymmetry */
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
704 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
705 ses.newkeys->recv.algo_crypt =
36
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
706 (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
707 ses.newkeys->trans.algo_crypt =
36
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
708 (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
709 ses.newkeys->recv.crypt_mode =
502
43bbe17d6ba0 - Add Counter Mode support
Matt Johnston <matt@ucc.asn.au>
parents: 501
diff changeset
710 (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
711 ses.newkeys->trans.crypt_mode =
502
43bbe17d6ba0 - Add Counter Mode support
Matt Johnston <matt@ucc.asn.au>
parents: 501
diff changeset
712 (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
713 ses.newkeys->recv.algo_mac =
36
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
714 (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
715 ses.newkeys->trans.algo_mac =
36
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
716 (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
717 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
718 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
719 } else {
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
720 /* SERVER */
534
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents: 502
diff changeset
721 ses.newkeys->recv.algo_crypt =
36
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
722 (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
723 ses.newkeys->trans.algo_crypt =
36
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
724 (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
725 ses.newkeys->recv.crypt_mode =
502
43bbe17d6ba0 - Add Counter Mode support
Matt Johnston <matt@ucc.asn.au>
parents: 501
diff changeset
726 (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
727 ses.newkeys->trans.crypt_mode =
502
43bbe17d6ba0 - Add Counter Mode support
Matt Johnston <matt@ucc.asn.au>
parents: 501
diff changeset
728 (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
729 ses.newkeys->recv.algo_mac =
36
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
730 (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
731 ses.newkeys->trans.algo_mac =
36
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
732 (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
733 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
734 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
735 }
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
736
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
737 /* reserved for future extensions */
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
738 buf_getint(ses.payload);
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
739 return;
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
740
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
741 error:
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
742 dropbear_exit("no matching algo %s", erralgo);
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
743 }