annotate common-kex.c @ 74:e3adf4cf5465

License boilerplate etc, add Mihnea as an author to some of the files
author Matt Johnston <matt@ucc.asn.au>
date Sat, 14 Aug 2004 17:54:20 +0000
parents a600c015562d
children 5a55bd66707f
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1 /*
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e3adf4cf5465 License boilerplate etc, add Mihnea as an author to some of the files
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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 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
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51 const int DH_G_VAL = 2;
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52
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53 static void kexinitialise();
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54 void gen_new_keys();
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55 #ifndef DISABLE_ZLIB
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56 static void gen_new_zstreams();
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57 #endif
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58 static void read_kex_algos();
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59 /* helper function for gen_new_keys */
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60 static void hashkeys(unsigned char *out, int outlen,
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61 const hash_state * hs, unsigned const char X);
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64 /* Send our list of algorithms we can use */
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65 void send_msg_kexinit() {
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66
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67 CHECKCLEARTOWRITE();
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68 buf_putbyte(ses.writepayload, SSH_MSG_KEXINIT);
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69
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70 /* cookie */
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71 genrandom(buf_getwriteptr(ses.writepayload, 16), 16);
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72 buf_incrwritepos(ses.writepayload, 16);
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73
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74 /* kex algos */
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75 buf_put_algolist(ses.writepayload, sshkex);
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76
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77 /* server_host_key_algorithms */
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78 buf_put_algolist(ses.writepayload, sshhostkey);
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79
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80 /* encryption_algorithms_client_to_server */
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81 buf_put_algolist(ses.writepayload, sshciphers);
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82
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83 /* encryption_algorithms_server_to_client */
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84 buf_put_algolist(ses.writepayload, sshciphers);
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85
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86 /* mac_algorithms_client_to_server */
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87 buf_put_algolist(ses.writepayload, sshhashes);
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88
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89 /* mac_algorithms_server_to_client */
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90 buf_put_algolist(ses.writepayload, sshhashes);
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91
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92 /* compression_algorithms_client_to_server */
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93 buf_put_algolist(ses.writepayload, sshcompress);
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94
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95 /* compression_algorithms_server_to_client */
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96 buf_put_algolist(ses.writepayload, sshcompress);
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97
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98 /* languages_client_to_server */
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99 buf_putstring(ses.writepayload, "", 0);
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100
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101 /* languages_server_to_client */
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102 buf_putstring(ses.writepayload, "", 0);
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103
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104 /* first_kex_packet_follows - unimplemented for now */
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105 buf_putbyte(ses.writepayload, 0x00);
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106
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107 /* reserved unit32 */
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108 buf_putint(ses.writepayload, 0);
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109
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110 /* set up transmitted kex packet buffer for hashing.
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111 * This is freed after the end of the kex */
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112 ses.transkexinit = buf_newcopy(ses.writepayload);
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113
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114 encrypt_packet();
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115 ses.dataallowed = 0; /* don't send other packets during kex */
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116
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117 TRACE(("DATAALLOWED=0"));
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118 TRACE(("-> KEXINIT"));
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119 ses.kexstate.sentkexinit = 1;
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120 }
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121
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122 /* *** NOTE regarding (send|recv)_msg_newkeys ***
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123 * Changed by mihnea from the original kex.c to set dataallowed after a
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124 * completed key exchange, no matter the order in which it was performed.
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125 * This enables client mode without affecting server functionality.
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126 */
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127
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128 /* Bring new keys into use after a key exchange, and let the client know*/
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129 void send_msg_newkeys() {
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130
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131 TRACE(("enter send_msg_newkeys"));
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132
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133 /* generate the kexinit request */
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134 CHECKCLEARTOWRITE();
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135 buf_putbyte(ses.writepayload, SSH_MSG_NEWKEYS);
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136 encrypt_packet();
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137
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138
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139 /* set up our state */
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140 if (ses.kexstate.recvnewkeys) {
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141 TRACE(("while RECVNEWKEYS=1"));
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142 gen_new_keys();
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143 kexinitialise(); /* we've finished with this kex */
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144 TRACE((" -> DATAALLOWED=1"));
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145 ses.dataallowed = 1; /* we can send other packets again now */
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146 ses.kexstate.donefirstkex = 1;
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147 } else {
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148 ses.kexstate.sentnewkeys = 1;
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149 TRACE(("SENTNEWKEYS=1"));
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150 }
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151
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152 TRACE(("-> MSG_NEWKEYS"));
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153 TRACE(("leave send_msg_newkeys"));
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154 }
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155
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156 /* Bring the new keys into use after a key exchange */
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157 void recv_msg_newkeys() {
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158
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159 TRACE(("<- MSG_NEWKEYS"));
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160 TRACE(("enter recv_msg_newkeys"));
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161
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162 /* simply check if we've sent SSH_MSG_NEWKEYS, and if so,
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163 * switch to the new keys */
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164 if (ses.kexstate.sentnewkeys) {
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165 TRACE(("while SENTNEWKEYS=1"));
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166 gen_new_keys();
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167 kexinitialise(); /* we've finished with this kex */
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168 TRACE((" -> DATAALLOWED=1"));
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169 ses.dataallowed = 1; /* we can send other packets again now */
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170 ses.kexstate.donefirstkex = 1;
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171 } else {
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172 TRACE(("RECVNEWKEYS=1"));
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173 ses.kexstate.recvnewkeys = 1;
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174 }
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175
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176 TRACE(("leave recv_msg_newkeys"));
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177 }
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178
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179
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180 /* Set up the kex for the first time */
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181 void kexfirstinitialise() {
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182
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183 ses.kexstate.donefirstkex = 0;
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184 kexinitialise();
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185 }
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186
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187 /* Reset the kex state, ready for a new negotiation */
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188 static void kexinitialise() {
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189
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190 struct timeval tv;
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191
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192 TRACE(("kexinitialise()"));
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193
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194 /* sent/recv'd MSG_KEXINIT */
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195 ses.kexstate.sentkexinit = 0;
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196 ses.kexstate.recvkexinit = 0;
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197
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198 /* sent/recv'd MSG_NEWKEYS */
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199 ses.kexstate.recvnewkeys = 0;
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200 ses.kexstate.sentnewkeys = 0;
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201
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202 /* first_packet_follows */
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203 ses.kexstate.firstfollows = 0;
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204
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205 ses.kexstate.datatrans = 0;
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206 ses.kexstate.datarecv = 0;
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207
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208 if (gettimeofday(&tv, 0) < 0) {
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209 dropbear_exit("Error getting time");
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210 }
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211 ses.kexstate.lastkextime = tv.tv_sec;
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212
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213 }
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214
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215 /* Helper function for gen_new_keys, creates a hash. It makes a copy of the
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216 * already initialised hash_state hs, which should already have processed
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217 * the dh_K and hash, since these are common. X is the letter 'A', 'B' etc.
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218 * out must have at least min(SHA1_HASH_SIZE, outlen) bytes allocated.
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219 * The output will only be expanded once, since that is all that is required
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220 * (for 3DES and SHA, with 24 and 20 bytes respectively).
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221 *
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222 * See Section 5.2 of the IETF secsh Transport Draft for details */
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223
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224 /* Duplicated verbatim from kex.c --mihnea */
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225 static void hashkeys(unsigned char *out, int outlen,
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226 const hash_state * hs, const unsigned char X) {
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227
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228 hash_state hs2;
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229 unsigned char k2[SHA1_HASH_SIZE]; /* used to extending */
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230
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231 memcpy(&hs2, hs, sizeof(hash_state));
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232 sha1_process(&hs2, &X, 1);
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233 sha1_process(&hs2, ses.session_id, SHA1_HASH_SIZE);
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234 sha1_done(&hs2, out);
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235 if (SHA1_HASH_SIZE < outlen) {
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236 /* need to extend */
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237 memcpy(&hs2, hs, sizeof(hash_state));
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238 sha1_process(&hs2, out, SHA1_HASH_SIZE);
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239 sha1_done(&hs2, k2);
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240 memcpy(&out[SHA1_HASH_SIZE], k2, outlen - SHA1_HASH_SIZE);
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241 }
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242 }
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243
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244 /* Generate the actual encryption/integrity keys, using the results of the
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245 * key exchange, as specified in section 5.2 of the IETF secsh-transport
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246 * draft. This occurs after the DH key-exchange.
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247 *
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248 * ses.newkeys is the new set of keys which are generated, these are only
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249 * taken into use after both sides have sent a newkeys message */
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250
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251 /* Originally from kex.c, generalized for cli/svr mode --mihnea */
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252 void gen_new_keys() {
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253
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254 unsigned char C2S_IV[MAX_IV_LEN];
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255 unsigned char C2S_key[MAX_KEY_LEN];
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256 unsigned char S2C_IV[MAX_IV_LEN];
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257 unsigned char S2C_key[MAX_KEY_LEN];
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258 /* unsigned char key[MAX_KEY_LEN]; */
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259 unsigned char *trans_IV, *trans_key, *recv_IV, *recv_key;
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260
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261 hash_state hs;
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262 unsigned int C2S_keysize, S2C_keysize;
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263 char mactransletter, macrecvletter; /* Client or server specific */
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264
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265 TRACE(("enter gen_new_keys"));
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266 /* the dh_K and hash are the start of all hashes, we make use of that */
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267
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268 sha1_init(&hs);
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269 sha1_process_mp(&hs, ses.dh_K);
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270 mp_clear(ses.dh_K);
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271 m_free(ses.dh_K);
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272 sha1_process(&hs, ses.hash, SHA1_HASH_SIZE);
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273 m_burn(ses.hash, SHA1_HASH_SIZE);
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274
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275 if (IS_DROPBEAR_CLIENT) {
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276 trans_IV = C2S_IV;
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277 recv_IV = S2C_IV;
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278 trans_key = C2S_key;
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279 recv_key = S2C_key;
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280 C2S_keysize = ses.newkeys->trans_algo_crypt->keysize;
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281 S2C_keysize = ses.newkeys->recv_algo_crypt->keysize;
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282 mactransletter = 'E';
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283 macrecvletter = 'F';
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284 } else {
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285 trans_IV = S2C_IV;
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286 recv_IV = C2S_IV;
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287 trans_key = S2C_key;
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288 recv_key = C2S_key;
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289 C2S_keysize = ses.newkeys->recv_algo_crypt->keysize;
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290 S2C_keysize = ses.newkeys->trans_algo_crypt->keysize;
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291 mactransletter = 'F';
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292 macrecvletter = 'E';
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293 }
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294
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295 hashkeys(C2S_IV, SHA1_HASH_SIZE, &hs, 'A');
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296 hashkeys(S2C_IV, SHA1_HASH_SIZE, &hs, 'B');
4
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297 hashkeys(C2S_key, C2S_keysize, &hs, 'C');
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298 hashkeys(S2C_key, S2C_keysize, &hs, 'D');
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299
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300 if (cbc_start(
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301 find_cipher(ses.newkeys->recv_algo_crypt->cipherdesc->name),
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302 recv_IV, recv_key,
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303 ses.newkeys->recv_algo_crypt->keysize, 0,
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304 &ses.newkeys->recv_symmetric_struct) != CRYPT_OK) {
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305 dropbear_exit("crypto error");
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306 }
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307
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308 if (cbc_start(
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309 find_cipher(ses.newkeys->trans_algo_crypt->cipherdesc->name),
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310 trans_IV, trans_key,
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311 ses.newkeys->trans_algo_crypt->keysize, 0,
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312 &ses.newkeys->trans_symmetric_struct) != CRYPT_OK) {
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313 dropbear_exit("crypto error");
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314 }
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315
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316 /* MAC keys */
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317 hashkeys(ses.newkeys->transmackey,
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318 ses.newkeys->trans_algo_mac->keysize, &hs, mactransletter);
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319 hashkeys(ses.newkeys->recvmackey,
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320 ses.newkeys->recv_algo_mac->keysize, &hs, macrecvletter);
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321
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322 #ifndef DISABLE_ZLIB
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323 gen_new_zstreams();
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324 #endif
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325
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326 /* Switch over to the new keys */
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327 m_burn(ses.keys, sizeof(struct key_context));
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328 m_free(ses.keys);
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329 ses.keys = ses.newkeys;
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330 ses.newkeys = NULL;
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331
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332 TRACE(("leave gen_new_keys"));
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333 }
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334
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335 #ifndef DISABLE_ZLIB
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336 /* Set up new zlib compression streams, close the old ones. Only
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337 * called from gen_new_keys() */
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338 static void gen_new_zstreams() {
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339
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340 /* create new zstreams */
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341 if (ses.newkeys->recv_algo_comp == DROPBEAR_COMP_ZLIB) {
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342 ses.newkeys->recv_zstream = (z_streamp)m_malloc(sizeof(z_stream));
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343 ses.newkeys->recv_zstream->zalloc = Z_NULL;
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344 ses.newkeys->recv_zstream->zfree = Z_NULL;
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345
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346 if (inflateInit(ses.newkeys->recv_zstream) != Z_OK) {
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347 dropbear_exit("zlib error");
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348 }
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349 } else {
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350 ses.newkeys->recv_zstream = NULL;
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351 }
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352
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353 if (ses.newkeys->trans_algo_comp == DROPBEAR_COMP_ZLIB) {
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354 ses.newkeys->trans_zstream = (z_streamp)m_malloc(sizeof(z_stream));
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355 ses.newkeys->trans_zstream->zalloc = Z_NULL;
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356 ses.newkeys->trans_zstream->zfree = Z_NULL;
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357
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358 if (deflateInit(ses.newkeys->trans_zstream, Z_DEFAULT_COMPRESSION)
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359 != Z_OK) {
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360 dropbear_exit("zlib error");
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361 }
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362 } else {
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363 ses.newkeys->trans_zstream = NULL;
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364 }
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365
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diff changeset
366 /* clean up old keys */
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367 if (ses.keys->recv_zstream != NULL) {
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368 if (inflateEnd(ses.keys->recv_zstream) == Z_STREAM_ERROR) {
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369 /* Z_DATA_ERROR is ok, just means that stream isn't ended */
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370 dropbear_exit("crypto error");
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371 }
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372 m_free(ses.keys->recv_zstream);
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373 }
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374 if (ses.keys->trans_zstream != NULL) {
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375 if (deflateEnd(ses.keys->trans_zstream) == Z_STREAM_ERROR) {
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376 /* Z_DATA_ERROR is ok, just means that stream isn't ended */
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377 dropbear_exit("crypto error");
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378 }
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379 m_free(ses.keys->trans_zstream);
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380 }
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381 }
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382 #endif
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383
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384
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parents:
diff changeset
385 /* Executed upon receiving a kexinit message from the client to initiate
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diff changeset
386 * key exchange. If we haven't already done so, we send the list of our
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diff changeset
387 * preferred algorithms. The client's requested algorithms are processed,
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diff changeset
388 * and we calculate the first portion of the key-exchange-hash for used
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diff changeset
389 * later in the key exchange. No response is sent, as the client should
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
390 * initiate the diffie-hellman key exchange */
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391
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diff changeset
392 /* Originally from kex.c, generalized for cli/svr mode --mihnea */
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diff changeset
393 /* Belongs in common_kex.c where it should be moved after review */
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Matt Johnston <matt@ucc.asn.au>
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diff changeset
394 void recv_msg_kexinit() {
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diff changeset
395
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diff changeset
396 TRACE(("<- KEXINIT"));
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diff changeset
397 TRACE(("enter recv_msg_kexinit"));
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diff changeset
398
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Matt Johnston <matt@ucc.asn.au>
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diff changeset
399 /* start the kex hash */
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parents:
diff changeset
400 ses.kexhashbuf = buf_new(MAX_KEXHASHBUF);
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parents:
diff changeset
401
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
402 if (!ses.kexstate.sentkexinit) {
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
403 /* we need to send a kex packet */
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
404 send_msg_kexinit();
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
405 TRACE(("continue recv_msg_kexinit: sent kexinit"));
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
406 }
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
407
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
408
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
409 if (IS_DROPBEAR_CLIENT) {
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parents:
diff changeset
410
26
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diff changeset
411 /* read the peer's choice of algos */
33
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diff changeset
412 read_kex_algos();
4
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diff changeset
413
26
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diff changeset
414 /* V_C, the client's version string (CR and NL excluded) */
4
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parents:
diff changeset
415 buf_putstring(ses.kexhashbuf,
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parents:
diff changeset
416 (unsigned char*)LOCAL_IDENT, strlen(LOCAL_IDENT));
26
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diff changeset
417 /* V_S, the server's version string (CR and NL excluded) */
4
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parents:
diff changeset
418 buf_putstring(ses.kexhashbuf,
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
419 ses.remoteident, strlen((char*)ses.remoteident));
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parents:
diff changeset
420
26
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diff changeset
421 /* I_C, the payload of the client's SSH_MSG_KEXINIT */
4
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parents:
diff changeset
422 buf_putstring(ses.kexhashbuf,
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parents:
diff changeset
423 buf_getptr(ses.transkexinit, ses.transkexinit->len),
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parents:
diff changeset
424 ses.transkexinit->len);
26
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diff changeset
425 /* I_S, the payload of the server's SSH_MSG_KEXINIT */
4
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parents:
diff changeset
426 buf_setpos(ses.payload, 0);
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parents:
diff changeset
427 buf_putstring(ses.kexhashbuf,
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parents:
diff changeset
428 buf_getptr(ses.payload, ses.payload->len),
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
429 ses.payload->len);
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parents:
diff changeset
430
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diff changeset
431 } else {
26
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diff changeset
432 /* SERVER */
4
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diff changeset
433
26
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diff changeset
434 /* read the peer's choice of algos */
33
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diff changeset
435 read_kex_algos();
26
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diff changeset
436 /* V_C, the client's version string (CR and NL excluded) */
4
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diff changeset
437 buf_putstring(ses.kexhashbuf,
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diff changeset
438 ses.remoteident, strlen((char*)ses.remoteident));
26
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diff changeset
439 /* V_S, the server's version string (CR and NL excluded) */
4
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parents:
diff changeset
440 buf_putstring(ses.kexhashbuf,
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parents:
diff changeset
441 (unsigned char*)LOCAL_IDENT, strlen(LOCAL_IDENT));
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diff changeset
442
26
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443 /* I_C, the payload of the client's SSH_MSG_KEXINIT */
4
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parents:
diff changeset
444 buf_setpos(ses.payload, 0);
fe6bca95afa7 Makefile.in contains updated files required
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parents:
diff changeset
445 buf_putstring(ses.kexhashbuf,
fe6bca95afa7 Makefile.in contains updated files required
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parents:
diff changeset
446 buf_getptr(ses.payload, ses.payload->len),
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
447 ses.payload->len);
26
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diff changeset
448 /* I_S, the payload of the server's SSH_MSG_KEXINIT */
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
449 buf_putstring(ses.kexhashbuf,
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
450 buf_getptr(ses.transkexinit, ses.transkexinit->len),
fe6bca95afa7 Makefile.in contains updated files required
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parents:
diff changeset
451 ses.transkexinit->len);
26
0969767bca0d snapshot of stuff
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diff changeset
452 ses.requirenext = SSH_MSG_KEXDH_INIT;
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
453 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
454
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
455 buf_free(ses.transkexinit);
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
456 ses.transkexinit = NULL;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
457 /* the rest of ses.kexhashbuf will be done after DH exchange */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
458
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
459 ses.kexstate.recvkexinit = 1;
22
c1e5d9195402 merge of abac2150ee4f4031a98016241fbd136d24fed127
Matt Johnston <matt@ucc.asn.au>
parents: 4
diff changeset
460 // ses.expecting = 0; // client matt
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
461
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
462 TRACE(("leave recv_msg_kexinit"));
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
463 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
464
26
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parents: 22
diff changeset
465 /* Initialises and generate one side of the diffie-hellman key exchange values.
0969767bca0d snapshot of stuff
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parents: 22
diff changeset
466 * See the ietf-secsh-transport draft, section 6, for details */
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diff changeset
467 void gen_kexdh_vals(mp_int *dh_pub, mp_int *dh_priv) {
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parents: 22
diff changeset
468
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parents: 22
diff changeset
469 mp_int dh_p, dh_q, dh_g;
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parents: 22
diff changeset
470 unsigned char randbuf[DH_P_LEN];
0969767bca0d snapshot of stuff
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parents: 22
diff changeset
471 int dh_q_len;
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parents: 22
diff changeset
472
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parents: 22
diff changeset
473 TRACE(("enter send_msg_kexdh_reply"));
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parents: 22
diff changeset
474
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diff changeset
475 m_mp_init_multi(&dh_g, &dh_p, &dh_q, dh_priv, dh_pub, NULL);
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parents: 22
diff changeset
476
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parents: 22
diff changeset
477 /* read the prime and generator*/
0969767bca0d snapshot of stuff
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parents: 22
diff changeset
478 if (mp_read_unsigned_bin(&dh_p, (unsigned char*)dh_p_val, DH_P_LEN)
0969767bca0d snapshot of stuff
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parents: 22
diff changeset
479 != MP_OKAY) {
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parents: 22
diff changeset
480 dropbear_exit("Diffie-Hellman error");
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parents: 22
diff changeset
481 }
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parents: 22
diff changeset
482
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parents: 22
diff changeset
483 if (mp_set_int(&dh_g, DH_G_VAL) != MP_OKAY) {
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parents: 22
diff changeset
484 dropbear_exit("Diffie-Hellman error");
0969767bca0d snapshot of stuff
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parents: 22
diff changeset
485 }
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Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
486
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
487 /* calculate q = (p-1)/2 */
0969767bca0d snapshot of stuff
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parents: 22
diff changeset
488 /* dh_priv is just a temp var here */
0969767bca0d snapshot of stuff
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parents: 22
diff changeset
489 if (mp_sub_d(&dh_p, 1, dh_priv) != MP_OKAY) {
0969767bca0d snapshot of stuff
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parents: 22
diff changeset
490 dropbear_exit("Diffie-Hellman error");
0969767bca0d snapshot of stuff
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parents: 22
diff changeset
491 }
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
492 if (mp_div_2(dh_priv, &dh_q) != MP_OKAY) {
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Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
493 dropbear_exit("Diffie-Hellman error");
0969767bca0d snapshot of stuff
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parents: 22
diff changeset
494 }
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
495
0969767bca0d snapshot of stuff
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parents: 22
diff changeset
496 dh_q_len = mp_unsigned_bin_size(&dh_q);
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
497
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
498 /* calculate our random value dh_y */
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
499 do {
0969767bca0d snapshot of stuff
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parents: 22
diff changeset
500 assert((unsigned int)dh_q_len <= sizeof(randbuf));
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
501 genrandom(randbuf, dh_q_len);
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
502 if (mp_read_unsigned_bin(dh_priv, randbuf, dh_q_len) != MP_OKAY) {
0969767bca0d snapshot of stuff
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parents: 22
diff changeset
503 dropbear_exit("Diffie-Hellman error");
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
504 }
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
505 } while (mp_cmp(dh_priv, &dh_q) == MP_GT || mp_cmp_d(dh_priv, 0) != MP_GT);
0969767bca0d snapshot of stuff
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parents: 22
diff changeset
506
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
507 /* f = g^y mod p */
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
508 if (mp_exptmod(&dh_g, dh_priv, &dh_p, dh_pub) != MP_OKAY) {
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
509 dropbear_exit("Diffie-Hellman error");
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
510 }
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
511 mp_clear_multi(&dh_g, &dh_p, &dh_q, NULL);
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
512 }
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
513
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
514 /* This function is fairly common between client/server, with some substitution
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
515 * of dh_e/dh_f etc. Hence these arguments:
0969767bca0d snapshot of stuff
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parents: 22
diff changeset
516 * dh_pub_us is 'e' for the client, 'f' for the server. dh_pub_them is
0969767bca0d snapshot of stuff
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parents: 22
diff changeset
517 * vice-versa. dh_priv is the x/y value corresponding to dh_pub_us */
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
518 void kexdh_comb_key(mp_int *dh_pub_us, mp_int *dh_priv, mp_int *dh_pub_them,
0969767bca0d snapshot of stuff
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parents: 22
diff changeset
519 sign_key *hostkey) {
0969767bca0d snapshot of stuff
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parents: 22
diff changeset
520
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
521 mp_int dh_p;
0969767bca0d snapshot of stuff
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parents: 22
diff changeset
522 mp_int *dh_e = NULL, *dh_f = NULL;
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
523 hash_state hs;
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
524
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
525 /* read the prime and generator*/
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
526 mp_init(&dh_p);
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
527 if (mp_read_unsigned_bin(&dh_p, (unsigned char*)dh_p_val, DH_P_LEN)
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
528 != MP_OKAY) {
0969767bca0d snapshot of stuff
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parents: 22
diff changeset
529 dropbear_exit("Diffie-Hellman error");
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
530 }
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
531
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
532 /* Check that dh_pub_them (dh_e or dh_f) is in the range [1, p-1] */
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
533 if (mp_cmp(dh_pub_them, &dh_p) != MP_LT
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
534 || mp_cmp_d(dh_pub_them, 0) != MP_GT) {
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
535 dropbear_exit("Diffie-Hellman error");
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
536 }
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
537
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
538 /* K = e^y mod p = f^x mod p */
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
539 ses.dh_K = (mp_int*)m_malloc(sizeof(mp_int));
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
540 m_mp_init(ses.dh_K);
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
541 if (mp_exptmod(dh_pub_them, dh_priv, &dh_p, ses.dh_K) != MP_OKAY) {
0969767bca0d snapshot of stuff
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parents: 22
diff changeset
542 dropbear_exit("Diffie-Hellman error");
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
543 }
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
544
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
545 /* clear no longer needed vars */
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
546 mp_clear_multi(&dh_p, NULL);
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
547
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
548 /* From here on, the code needs to work with the _same_ vars on each side,
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
549 * not vice-versaing for client/server */
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
550 if (IS_DROPBEAR_CLIENT) {
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
551 dh_e = dh_pub_us;
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
552 dh_f = dh_pub_them;
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
553 } else {
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
554 dh_e = dh_pub_them;
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
555 dh_f = dh_pub_us;
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
556 }
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
557
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
558 /* 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
559 /* K_S, the host key */
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
560 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
561 /* e, exchange value sent by the client */
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
562 buf_putmpint(ses.kexhashbuf, dh_e);
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
563 /* f, exchange value sent by the server */
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
564 buf_putmpint(ses.kexhashbuf, dh_f);
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
565 /* K, the shared secret */
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
566 buf_putmpint(ses.kexhashbuf, ses.dh_K);
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
567
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
568 /* calculate the hash H to sign */
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
569 sha1_init(&hs);
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
570 buf_setpos(ses.kexhashbuf, 0);
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
571 sha1_process(&hs, buf_getptr(ses.kexhashbuf, ses.kexhashbuf->len),
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
572 ses.kexhashbuf->len);
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
573 sha1_done(&hs, ses.hash);
35
0ad5fb979f42 set the isserver flag (oops)
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
574
0ad5fb979f42 set the isserver flag (oops)
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
575 buf_burn(ses.kexhashbuf);
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
576 buf_free(ses.kexhashbuf);
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
577 ses.kexhashbuf = NULL;
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
578
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
579 /* first time around, we set the session_id to H */
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
580 if (ses.session_id == NULL) {
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
581 /* create the session_id, this never needs freeing */
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
582 ses.session_id = (unsigned char*)m_malloc(SHA1_HASH_SIZE);
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
583 memcpy(ses.session_id, ses.hash, SHA1_HASH_SIZE);
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 }
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 /* 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
588 * algos for the client or server. */
33
f789045062e6 Progressing client support
Matt Johnston <matt@ucc.asn.au>
parents: 26
diff changeset
589 static void read_kex_algos() {
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
590
36
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
591 /* for asymmetry */
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
592 algo_type * c2s_hash_algo = NULL;
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
593 algo_type * s2c_hash_algo = NULL;
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
594 algo_type * c2s_cipher_algo = NULL;
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
595 algo_type * s2c_cipher_algo = NULL;
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
596 algo_type * c2s_comp_algo = NULL;
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
597 algo_type * s2c_comp_algo = NULL;
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
598 /* the generic one */
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
599 algo_type * algo = NULL;
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
600
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
601 /* which algo couldn't match */
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
602 char * erralgo = NULL;
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 int goodguess = 0;
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
605 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
606 true after */
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
607
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
608 buf_incrpos(ses.payload, 16); /* start after the cookie */
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
609
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
610 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
611
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
612 /* kex_algorithms */
33
f789045062e6 Progressing client support
Matt Johnston <matt@ucc.asn.au>
parents: 26
diff changeset
613 algo = ses.buf_match_algo(ses.payload, sshkex, &goodguess);
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
614 allgood &= goodguess;
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
615 if (algo == NULL) {
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
616 erralgo = "kex";
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
617 goto error;
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
618 }
34
e2a1eaa19f22 Client mostly works up to password auth
Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
619 TRACE(("kex algo %s", algo->name));
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
620 ses.newkeys->algo_kex = algo->val;
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
621
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
622 /* server_host_key_algorithms */
33
f789045062e6 Progressing client support
Matt Johnston <matt@ucc.asn.au>
parents: 26
diff changeset
623 algo = ses.buf_match_algo(ses.payload, sshhostkey, &goodguess);
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
624 allgood &= goodguess;
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
625 if (algo == NULL) {
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
626 erralgo = "hostkey";
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
627 goto error;
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
628 }
34
e2a1eaa19f22 Client mostly works up to password auth
Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
629 TRACE(("hostkey algo %s", algo->name));
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
630 ses.newkeys->algo_hostkey = algo->val;
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
631
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
632 /* encryption_algorithms_client_to_server */
36
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
633 c2s_cipher_algo = ses.buf_match_algo(ses.payload, sshciphers, &goodguess);
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
634 if (algo == NULL) {
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
635 erralgo = "enc c->s";
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
636 goto error;
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
637 }
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 /* encryption_algorithms_server_to_client */
36
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
640 s2c_cipher_algo = ses.buf_match_algo(ses.payload, sshciphers, &goodguess);
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
641 if (algo == NULL) {
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
642 erralgo = "enc s->c";
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
643 goto error;
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
644 }
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
645
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
646 /* mac_algorithms_client_to_server */
36
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
647 c2s_hash_algo = ses.buf_match_algo(ses.payload, sshhashes, &goodguess);
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
648 if (algo == NULL) {
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
649 erralgo = "mac c->s";
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
650 goto error;
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
651 }
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
652
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
653 /* mac_algorithms_server_to_client */
36
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
654 s2c_hash_algo = ses.buf_match_algo(ses.payload, sshhashes, &goodguess);
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
655 if (algo == NULL) {
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
656 erralgo = "mac s->c";
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
657 goto error;
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
658 }
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
659
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
660 /* compression_algorithms_client_to_server */
36
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
661 c2s_comp_algo = ses.buf_match_algo(ses.payload, sshcompress, &goodguess);
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
662 if (algo == NULL) {
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
663 erralgo = "comp c->s";
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
664 goto error;
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
665 }
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
666
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
667 /* compression_algorithms_server_to_client */
36
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
668 s2c_comp_algo = ses.buf_match_algo(ses.payload, sshcompress, &goodguess);
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
669 if (algo == NULL) {
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
670 erralgo = "comp s->c";
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
671 goto error;
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
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
674 /* languages_client_to_server */
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
675 buf_eatstring(ses.payload);
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
676
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
677 /* languages_server_to_client */
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
678 buf_eatstring(ses.payload);
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 /* first_kex_packet_follows */
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
681 if (buf_getbyte(ses.payload)) {
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
682 ses.kexstate.firstfollows = 1;
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
683 /* 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
684 if (!allgood) {
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
685 ses.ignorenext = 1;
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
686 }
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
36
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
689 /* Handle the asymmetry */
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
690 if (IS_DROPBEAR_CLIENT) {
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
691 ses.newkeys->recv_algo_crypt =
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
692 (struct dropbear_cipher*)s2c_cipher_algo->data;
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
693 ses.newkeys->trans_algo_crypt =
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
694 (struct dropbear_cipher*)c2s_cipher_algo->data;
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
695 ses.newkeys->recv_algo_mac =
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
696 (struct dropbear_hash*)s2c_hash_algo->data;
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
697 ses.newkeys->trans_algo_mac =
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
698 (struct dropbear_hash*)c2s_hash_algo->data;
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
699 ses.newkeys->recv_algo_comp = s2c_comp_algo->val;
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
700 ses.newkeys->trans_algo_comp = c2s_comp_algo->val;
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
701 } else {
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
702 /* SERVER */
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
703 ses.newkeys->recv_algo_crypt =
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
704 (struct dropbear_cipher*)c2s_cipher_algo->data;
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
705 ses.newkeys->trans_algo_crypt =
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;
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
707 ses.newkeys->recv_algo_mac =
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
708 (struct dropbear_hash*)c2s_hash_algo->data;
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
709 ses.newkeys->trans_algo_mac =
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
710 (struct dropbear_hash*)s2c_hash_algo->data;
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
711 ses.newkeys->recv_algo_comp = c2s_comp_algo->val;
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
712 ses.newkeys->trans_algo_comp = s2c_comp_algo->val;
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
713 }
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
714
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
715 TRACE(("enc algo recv %s", algo->name));
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
716 TRACE(("enc algo trans %s", algo->name));
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
717 TRACE(("mac algo recv %s", algo->name));
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
718 TRACE(("mac algo trans %s", algo->name));
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
719 TRACE(("comp algo recv %s", algo->name));
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
720 TRACE(("comp algo trans %s", algo->name));
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
721
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
722 /* reserved for future extensions */
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
723 buf_getint(ses.payload);
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
724 return;
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
725
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
726 error:
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
727 dropbear_exit("no matching algo %s", erralgo);
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
728 }