annotate common-kex.c @ 1604:99ca393afc56

It turns out you can't have a single-quote in an #error
author Matt Johnston <matt@ucc.asn.au>
date Thu, 08 Mar 2018 22:37:54 +0800
parents 2f64cb3d3007
children 0bdbb9ecc403
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 /*
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2 * Dropbear SSH
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3 *
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f789045062e6 Progressing client support
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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 "dh_groups.h"
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33 #include "ssh.h"
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34 #include "packet.h"
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35 #include "bignum.h"
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36 #include "dbrandom.h"
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37 #include "runopts.h"
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38 #include "ecc.h"
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39 #include "crypto_desc.h"
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40
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41 static void kexinitialise(void);
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42 static void gen_new_keys(void);
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43 #ifndef DISABLE_ZLIB
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44 static void gen_new_zstream_recv(void);
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45 static void gen_new_zstream_trans(void);
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46 #endif
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47 static void read_kex_algos(void);
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48 /* helper function for gen_new_keys */
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49 static void hashkeys(unsigned char *out, unsigned int outlen,
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50 const hash_state * hs, const unsigned char X);
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52
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53 /* Send our list of algorithms we can use */
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54 void send_msg_kexinit() {
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56 CHECKCLEARTOWRITE();
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57 buf_putbyte(ses.writepayload, SSH_MSG_KEXINIT);
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58
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59 /* cookie */
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60 genrandom(buf_getwriteptr(ses.writepayload, 16), 16);
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61 buf_incrwritepos(ses.writepayload, 16);
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62
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63 /* kex algos */
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64 buf_put_algolist(ses.writepayload, sshkex);
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65
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66 /* server_host_key_algorithms */
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67 buf_put_algolist(ses.writepayload, sshhostkey);
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68
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69 /* encryption_algorithms_client_to_server */
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70 buf_put_algolist(ses.writepayload, sshciphers);
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71
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72 /* encryption_algorithms_server_to_client */
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73 buf_put_algolist(ses.writepayload, sshciphers);
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75 /* mac_algorithms_client_to_server */
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76 buf_put_algolist(ses.writepayload, sshhashes);
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77
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78 /* mac_algorithms_server_to_client */
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79 buf_put_algolist(ses.writepayload, sshhashes);
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81
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82 /* compression_algorithms_client_to_server */
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83 buf_put_algolist(ses.writepayload, ses.compress_algos);
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84
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85 /* compression_algorithms_server_to_client */
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86 buf_put_algolist(ses.writepayload, ses.compress_algos);
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88 /* languages_client_to_server */
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89 buf_putstring(ses.writepayload, "", 0);
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90
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91 /* languages_server_to_client */
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92 buf_putstring(ses.writepayload, "", 0);
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93
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94 /* first_kex_packet_follows */
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95 buf_putbyte(ses.writepayload, (ses.send_kex_first_guess != NULL));
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97 /* reserved unit32 */
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98 buf_putint(ses.writepayload, 0);
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99
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100 /* set up transmitted kex packet buffer for hashing.
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101 * This is freed after the end of the kex */
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102 ses.transkexinit = buf_newcopy(ses.writepayload);
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103
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104 encrypt_packet();
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105 ses.dataallowed = 0; /* don't send other packets during kex */
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106
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107 ses.kexstate.sentkexinit = 1;
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108
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109 ses.newkeys = (struct key_context*)m_malloc(sizeof(struct key_context));
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110
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111 if (ses.send_kex_first_guess) {
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112 ses.newkeys->algo_kex = sshkex[0].data;
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113 ses.newkeys->algo_hostkey = sshhostkey[0].val;
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114 ses.send_kex_first_guess();
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115 }
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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
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120 }
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121
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122 static void switch_keys() {
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123 TRACE2(("enter switch_keys"))
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124 if (!(ses.kexstate.sentkexinit && ses.kexstate.recvkexinit)) {
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125 dropbear_exit("Unexpected newkeys message");
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126 }
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127
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128 if (!ses.keys) {
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129 ses.keys = m_malloc(sizeof(*ses.newkeys));
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130 }
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131 if (ses.kexstate.recvnewkeys && ses.newkeys->recv.valid) {
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132 TRACE(("switch_keys recv"))
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133 #ifndef DISABLE_ZLIB
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134 gen_new_zstream_recv();
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135 #endif
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136 ses.keys->recv = ses.newkeys->recv;
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137 m_burn(&ses.newkeys->recv, sizeof(ses.newkeys->recv));
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138 ses.newkeys->recv.valid = 0;
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139 }
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140 if (ses.kexstate.sentnewkeys && ses.newkeys->trans.valid) {
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141 TRACE(("switch_keys trans"))
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142 #ifndef DISABLE_ZLIB
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143 gen_new_zstream_trans();
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144 #endif
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145 ses.keys->trans = ses.newkeys->trans;
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146 m_burn(&ses.newkeys->trans, sizeof(ses.newkeys->trans));
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147 ses.newkeys->trans.valid = 0;
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148 }
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149 if (ses.kexstate.sentnewkeys && ses.kexstate.recvnewkeys)
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150 {
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151 TRACE(("switch_keys done"))
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152 ses.keys->algo_kex = ses.newkeys->algo_kex;
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153 ses.keys->algo_hostkey = ses.newkeys->algo_hostkey;
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154 ses.keys->allow_compress = 0;
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155 m_free(ses.newkeys);
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156 ses.newkeys = NULL;
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157 kexinitialise();
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158 }
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159 TRACE2(("leave switch_keys"))
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160 }
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161
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162 /* Bring new keys into use after a key exchange, and let the client know*/
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163 void send_msg_newkeys() {
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164
165
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165 TRACE(("enter send_msg_newkeys"))
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166
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167 /* generate the kexinit request */
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168 CHECKCLEARTOWRITE();
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169 buf_putbyte(ses.writepayload, SSH_MSG_NEWKEYS);
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170 encrypt_packet();
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171
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172
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173 /* set up our state */
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174 ses.kexstate.sentnewkeys = 1;
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175 ses.kexstate.donefirstkex = 1;
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176 ses.dataallowed = 1; /* we can send other packets again now */
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177 gen_new_keys();
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178 switch_keys();
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179
165
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180 TRACE(("leave send_msg_newkeys"))
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181 }
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182
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183 /* Bring the new keys into use after a key exchange */
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184 void recv_msg_newkeys() {
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185
165
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186 TRACE(("enter recv_msg_newkeys"))
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187
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188 ses.kexstate.recvnewkeys = 1;
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189 switch_keys();
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190
165
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191 TRACE(("leave recv_msg_newkeys"))
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192 }
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193
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194
33
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195 /* Set up the kex for the first time */
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196 void kexfirstinitialise() {
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197 ses.kexstate.donefirstkex = 0;
33
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198
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199 #ifdef DISABLE_ZLIB
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200 ses.compress_algos = ssh_nocompress;
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201 #else
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202 switch (opts.compress_mode)
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203 {
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204 case DROPBEAR_COMPRESS_DELAYED:
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205 ses.compress_algos = ssh_delaycompress;
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206 break;
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207
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208 case DROPBEAR_COMPRESS_ON:
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209 ses.compress_algos = ssh_compress;
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210 break;
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211
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212 case DROPBEAR_COMPRESS_OFF:
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213 ses.compress_algos = ssh_nocompress;
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214 break;
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215 }
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216 #endif
33
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217 kexinitialise();
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218 }
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219
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220 /* Reset the kex state, ready for a new negotiation */
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221 static void kexinitialise() {
4
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222
165
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223 TRACE(("kexinitialise()"))
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224
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225 /* sent/recv'd MSG_KEXINIT */
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226 ses.kexstate.sentkexinit = 0;
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227 ses.kexstate.recvkexinit = 0;
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228
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229 /* sent/recv'd MSG_NEWKEYS */
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230 ses.kexstate.recvnewkeys = 0;
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231 ses.kexstate.sentnewkeys = 0;
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232
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233 /* first_packet_follows */
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234 ses.kexstate.them_firstfollows = 0;
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235
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236 ses.kexstate.datatrans = 0;
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237 ses.kexstate.datarecv = 0;
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238
739
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diff changeset
239 ses.kexstate.our_first_follows_matches = 0;
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240
928
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diff changeset
241 ses.kexstate.lastkextime = monotonic_now();
4
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242
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243 }
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244
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245 /* Helper function for gen_new_keys, creates a hash. It makes a copy of the
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246 * already initialised hash_state hs, which should already have processed
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247 * the dh_K and hash, since these are common. X is the letter 'A', 'B' etc.
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248 * out must have at least min(SHA1_HASH_SIZE, outlen) bytes allocated.
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249 *
409
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parents: 257
diff changeset
250 * See Section 7.2 of rfc4253 (ssh transport) for details */
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diff changeset
251 static void hashkeys(unsigned char *out, unsigned int outlen,
4
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252 const hash_state * hs, const unsigned char X) {
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253
793
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diff changeset
254 const struct ltc_hash_descriptor *hash_desc = ses.newkeys->algo_kex->hash_desc;
4
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255 hash_state hs2;
762
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diff changeset
256 unsigned int offset;
855
04ede40a529a - Some fixes for old compilers like tru64 v4 from Daniel Richard G.
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diff changeset
257 unsigned char tmpout[MAX_HASH_SIZE];
4
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258
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259 memcpy(&hs2, hs, sizeof(hash_state));
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diff changeset
260 hash_desc->process(&hs2, &X, 1);
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diff changeset
261 hash_desc->process(&hs2, ses.session_id->data, ses.session_id->len);
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diff changeset
262 hash_desc->done(&hs2, tmpout);
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diff changeset
263 memcpy(out, tmpout, MIN(hash_desc->hashsize, outlen));
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diff changeset
264 for (offset = hash_desc->hashsize;
679
03073a27abb3 - Add hmac-sha2-256 and hmac-sha2-512. Needs debugging, seems to be
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diff changeset
265 offset < outlen;
793
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diff changeset
266 offset += hash_desc->hashsize)
679
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267 {
4
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268 /* need to extend */
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269 memcpy(&hs2, hs, sizeof(hash_state));
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270 hash_desc->process(&hs2, out, offset);
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271 hash_desc->done(&hs2, tmpout);
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272 memcpy(&out[offset], tmpout, MIN(outlen - offset, hash_desc->hashsize));
4
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273 }
987
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diff changeset
274 m_burn(&hs2, sizeof(hash_state));
4
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275 }
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276
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277 /* Generate the actual encryption/integrity keys, using the results of the
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diff changeset
278 * key exchange, as specified in section 7.2 of the transport rfc 4253.
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diff changeset
279 * This occurs after the DH key-exchange.
4
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diff changeset
280 *
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281 * ses.newkeys is the new set of keys which are generated, these are only
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282 * taken into use after both sides have sent a newkeys message */
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283
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284 static void gen_new_keys() {
4
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285
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286 unsigned char C2S_IV[MAX_IV_LEN];
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287 unsigned char C2S_key[MAX_KEY_LEN];
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288 unsigned char S2C_IV[MAX_IV_LEN];
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parents:
diff changeset
289 unsigned char S2C_key[MAX_KEY_LEN];
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
290 /* unsigned char key[MAX_KEY_LEN]; */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
291 unsigned char *trans_IV, *trans_key, *recv_IV, *recv_key;
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
292
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
293 hash_state hs;
793
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 766
diff changeset
294 const struct ltc_hash_descriptor *hash_desc = ses.newkeys->algo_kex->hash_desc;
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
295 char mactransletter, macrecvletter; /* Client or server specific */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
296
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
297 TRACE(("enter gen_new_keys"))
4
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
298 /* the dh_K and hash are the start of all hashes, we make use of that */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
299
793
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 766
diff changeset
300 hash_desc->init(&hs);
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 766
diff changeset
301 hash_process_mp(hash_desc, &hs, ses.dh_K);
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
302 mp_clear(ses.dh_K);
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
303 m_free(ses.dh_K);
793
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 766
diff changeset
304 hash_desc->process(&hs, ses.hash->data, ses.hash->len);
761
ac2158e3e403 ecc kind of works, needs fixing/testing
Matt Johnston <matt@ucc.asn.au>
parents: 759
diff changeset
305 buf_burn(ses.hash);
ac2158e3e403 ecc kind of works, needs fixing/testing
Matt Johnston <matt@ucc.asn.au>
parents: 759
diff changeset
306 buf_free(ses.hash);
ac2158e3e403 ecc kind of works, needs fixing/testing
Matt Johnston <matt@ucc.asn.au>
parents: 759
diff changeset
307 ses.hash = NULL;
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
308
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
309 if (IS_DROPBEAR_CLIENT) {
1250
2bb4c662d1c2 more hard tab
Francois Perrad <francois.perrad@gadz.org>
parents: 1175
diff changeset
310 trans_IV = C2S_IV;
2bb4c662d1c2 more hard tab
Francois Perrad <francois.perrad@gadz.org>
parents: 1175
diff changeset
311 recv_IV = S2C_IV;
2bb4c662d1c2 more hard tab
Francois Perrad <francois.perrad@gadz.org>
parents: 1175
diff changeset
312 trans_key = C2S_key;
2bb4c662d1c2 more hard tab
Francois Perrad <francois.perrad@gadz.org>
parents: 1175
diff changeset
313 recv_key = S2C_key;
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
314 mactransletter = 'E';
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
315 macrecvletter = 'F';
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
316 } else {
1250
2bb4c662d1c2 more hard tab
Francois Perrad <francois.perrad@gadz.org>
parents: 1175
diff changeset
317 trans_IV = S2C_IV;
2bb4c662d1c2 more hard tab
Francois Perrad <francois.perrad@gadz.org>
parents: 1175
diff changeset
318 recv_IV = C2S_IV;
2bb4c662d1c2 more hard tab
Francois Perrad <francois.perrad@gadz.org>
parents: 1175
diff changeset
319 trans_key = S2C_key;
2bb4c662d1c2 more hard tab
Francois Perrad <francois.perrad@gadz.org>
parents: 1175
diff changeset
320 recv_key = C2S_key;
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
321 mactransletter = 'F';
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
322 macrecvletter = 'E';
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
323 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
324
762
a78a38e402d1 - Fix various hardcoded uses of SHA1
Matt Johnston <matt@ucc.asn.au>
parents: 761
diff changeset
325 hashkeys(C2S_IV, sizeof(C2S_IV), &hs, 'A');
a78a38e402d1 - Fix various hardcoded uses of SHA1
Matt Johnston <matt@ucc.asn.au>
parents: 761
diff changeset
326 hashkeys(S2C_IV, sizeof(S2C_IV), &hs, 'B');
a78a38e402d1 - Fix various hardcoded uses of SHA1
Matt Johnston <matt@ucc.asn.au>
parents: 761
diff changeset
327 hashkeys(C2S_key, sizeof(C2S_key), &hs, 'C');
a78a38e402d1 - Fix various hardcoded uses of SHA1
Matt Johnston <matt@ucc.asn.au>
parents: 761
diff changeset
328 hashkeys(S2C_key, sizeof(S2C_key), &hs, 'D');
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
329
681
a4b7627b3157 Update insecure-nocrypto to current head
Matt Johnston <matt@ucc.asn.au>
parents: 679 512
diff changeset
330 if (ses.newkeys->recv.algo_crypt->cipherdesc != NULL) {
a4b7627b3157 Update insecure-nocrypto to current head
Matt Johnston <matt@ucc.asn.au>
parents: 679 512
diff changeset
331 int recv_cipher = find_cipher(ses.newkeys->recv.algo_crypt->cipherdesc->name);
512
0129fd8ccc71 Update nocrypto branch to current head
Matt Johnston <matt@ucc.asn.au>
parents: 511
diff changeset
332 if (recv_cipher < 0)
681
a4b7627b3157 Update insecure-nocrypto to current head
Matt Johnston <matt@ucc.asn.au>
parents: 679 512
diff changeset
333 dropbear_exit("Crypto error");
a4b7627b3157 Update insecure-nocrypto to current head
Matt Johnston <matt@ucc.asn.au>
parents: 679 512
diff changeset
334 if (ses.newkeys->recv.crypt_mode->start(recv_cipher,
252
29afa62b5450 - a hack for grahame to run dropbear with "none" cipher.
Matt Johnston <matt@ucc.asn.au>
parents: 228
diff changeset
335 recv_IV, recv_key,
681
a4b7627b3157 Update insecure-nocrypto to current head
Matt Johnston <matt@ucc.asn.au>
parents: 679 512
diff changeset
336 ses.newkeys->recv.algo_crypt->keysize, 0,
a4b7627b3157 Update insecure-nocrypto to current head
Matt Johnston <matt@ucc.asn.au>
parents: 679 512
diff changeset
337 &ses.newkeys->recv.cipher_state) != CRYPT_OK) {
a4b7627b3157 Update insecure-nocrypto to current head
Matt Johnston <matt@ucc.asn.au>
parents: 679 512
diff changeset
338 dropbear_exit("Crypto error");
252
29afa62b5450 - a hack for grahame to run dropbear with "none" cipher.
Matt Johnston <matt@ucc.asn.au>
parents: 228
diff changeset
339 }
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
340 }
502
43bbe17d6ba0 - Add Counter Mode support
Matt Johnston <matt@ucc.asn.au>
parents: 501
diff changeset
341
681
a4b7627b3157 Update insecure-nocrypto to current head
Matt Johnston <matt@ucc.asn.au>
parents: 679 512
diff changeset
342 if (ses.newkeys->trans.algo_crypt->cipherdesc != NULL) {
a4b7627b3157 Update insecure-nocrypto to current head
Matt Johnston <matt@ucc.asn.au>
parents: 679 512
diff changeset
343 int trans_cipher = find_cipher(ses.newkeys->trans.algo_crypt->cipherdesc->name);
512
0129fd8ccc71 Update nocrypto branch to current head
Matt Johnston <matt@ucc.asn.au>
parents: 511
diff changeset
344 if (trans_cipher < 0)
681
a4b7627b3157 Update insecure-nocrypto to current head
Matt Johnston <matt@ucc.asn.au>
parents: 679 512
diff changeset
345 dropbear_exit("Crypto error");
a4b7627b3157 Update insecure-nocrypto to current head
Matt Johnston <matt@ucc.asn.au>
parents: 679 512
diff changeset
346 if (ses.newkeys->trans.crypt_mode->start(trans_cipher,
252
29afa62b5450 - a hack for grahame to run dropbear with "none" cipher.
Matt Johnston <matt@ucc.asn.au>
parents: 228
diff changeset
347 trans_IV, trans_key,
681
a4b7627b3157 Update insecure-nocrypto to current head
Matt Johnston <matt@ucc.asn.au>
parents: 679 512
diff changeset
348 ses.newkeys->trans.algo_crypt->keysize, 0,
a4b7627b3157 Update insecure-nocrypto to current head
Matt Johnston <matt@ucc.asn.au>
parents: 679 512
diff changeset
349 &ses.newkeys->trans.cipher_state) != CRYPT_OK) {
a4b7627b3157 Update insecure-nocrypto to current head
Matt Johnston <matt@ucc.asn.au>
parents: 679 512
diff changeset
350 dropbear_exit("Crypto error");
252
29afa62b5450 - a hack for grahame to run dropbear with "none" cipher.
Matt Johnston <matt@ucc.asn.au>
parents: 228
diff changeset
351 }
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
352 }
512
0129fd8ccc71 Update nocrypto branch to current head
Matt Johnston <matt@ucc.asn.au>
parents: 511
diff changeset
353
793
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 766
diff changeset
354 if (ses.newkeys->trans.algo_mac->hash_desc != NULL) {
681
a4b7627b3157 Update insecure-nocrypto to current head
Matt Johnston <matt@ucc.asn.au>
parents: 679 512
diff changeset
355 hashkeys(ses.newkeys->trans.mackey,
a4b7627b3157 Update insecure-nocrypto to current head
Matt Johnston <matt@ucc.asn.au>
parents: 679 512
diff changeset
356 ses.newkeys->trans.algo_mac->keysize, &hs, mactransletter);
793
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 766
diff changeset
357 ses.newkeys->trans.hash_index = find_hash(ses.newkeys->trans.algo_mac->hash_desc->name);
252
29afa62b5450 - a hack for grahame to run dropbear with "none" cipher.
Matt Johnston <matt@ucc.asn.au>
parents: 228
diff changeset
358 }
712
bf0ac0512ef7 Fix "-m none" case and ugly typo
Matt Johnston <matt@ucc.asn.au>
parents: 684
diff changeset
359
793
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 766
diff changeset
360 if (ses.newkeys->recv.algo_mac->hash_desc != NULL) {
681
a4b7627b3157 Update insecure-nocrypto to current head
Matt Johnston <matt@ucc.asn.au>
parents: 679 512
diff changeset
361 hashkeys(ses.newkeys->recv.mackey,
a4b7627b3157 Update insecure-nocrypto to current head
Matt Johnston <matt@ucc.asn.au>
parents: 679 512
diff changeset
362 ses.newkeys->recv.algo_mac->keysize, &hs, macrecvletter);
793
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 766
diff changeset
363 ses.newkeys->recv.hash_index = find_hash(ses.newkeys->recv.algo_mac->hash_desc->name);
252
29afa62b5450 - a hack for grahame to run dropbear with "none" cipher.
Matt Johnston <matt@ucc.asn.au>
parents: 228
diff changeset
364 }
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
365
753
d63ef1e211ea Take transmit and receive keys into use separately
Matt Johnston <matt@ucc.asn.au>
parents: 746
diff changeset
366 /* Ready to switch over */
d63ef1e211ea Take transmit and receive keys into use separately
Matt Johnston <matt@ucc.asn.au>
parents: 746
diff changeset
367 ses.newkeys->trans.valid = 1;
d63ef1e211ea Take transmit and receive keys into use separately
Matt Johnston <matt@ucc.asn.au>
parents: 746
diff changeset
368 ses.newkeys->recv.valid = 1;
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
369
648
4222a1039b06 Clear a few buffers when possible
Matt Johnston <matt@ucc.asn.au>
parents: 603
diff changeset
370 m_burn(C2S_IV, sizeof(C2S_IV));
4222a1039b06 Clear a few buffers when possible
Matt Johnston <matt@ucc.asn.au>
parents: 603
diff changeset
371 m_burn(C2S_key, sizeof(C2S_key));
4222a1039b06 Clear a few buffers when possible
Matt Johnston <matt@ucc.asn.au>
parents: 603
diff changeset
372 m_burn(S2C_IV, sizeof(S2C_IV));
4222a1039b06 Clear a few buffers when possible
Matt Johnston <matt@ucc.asn.au>
parents: 603
diff changeset
373 m_burn(S2C_key, sizeof(S2C_key));
987
ed85797bbc85 clear hash state memory after use
Matt Johnston <matt@ucc.asn.au>
parents: 928
diff changeset
374 m_burn(&hs, sizeof(hash_state));
648
4222a1039b06 Clear a few buffers when possible
Matt Johnston <matt@ucc.asn.au>
parents: 603
diff changeset
375
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
376 TRACE(("leave gen_new_keys"))
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
377 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
378
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
379 #ifndef DISABLE_ZLIB
501
d58c478bd399 Add support for [email protected] delayed compression.
Matt Johnston <matt@ucc.asn.au>
parents: 454
diff changeset
380
d58c478bd399 Add support for [email protected] delayed compression.
Matt Johnston <matt@ucc.asn.au>
parents: 454
diff changeset
381 int is_compress_trans() {
534
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents: 502
diff changeset
382 return ses.keys->trans.algo_comp == DROPBEAR_COMP_ZLIB
501
d58c478bd399 Add support for [email protected] delayed compression.
Matt Johnston <matt@ucc.asn.au>
parents: 454
diff changeset
383 || (ses.authstate.authdone
534
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents: 502
diff changeset
384 && ses.keys->trans.algo_comp == DROPBEAR_COMP_ZLIB_DELAY);
501
d58c478bd399 Add support for [email protected] delayed compression.
Matt Johnston <matt@ucc.asn.au>
parents: 454
diff changeset
385 }
d58c478bd399 Add support for [email protected] delayed compression.
Matt Johnston <matt@ucc.asn.au>
parents: 454
diff changeset
386
d58c478bd399 Add support for [email protected] delayed compression.
Matt Johnston <matt@ucc.asn.au>
parents: 454
diff changeset
387 int is_compress_recv() {
534
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents: 502
diff changeset
388 return ses.keys->recv.algo_comp == DROPBEAR_COMP_ZLIB
501
d58c478bd399 Add support for [email protected] delayed compression.
Matt Johnston <matt@ucc.asn.au>
parents: 454
diff changeset
389 || (ses.authstate.authdone
534
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents: 502
diff changeset
390 && ses.keys->recv.algo_comp == DROPBEAR_COMP_ZLIB_DELAY);
501
d58c478bd399 Add support for [email protected] delayed compression.
Matt Johnston <matt@ucc.asn.au>
parents: 454
diff changeset
391 }
d58c478bd399 Add support for [email protected] delayed compression.
Matt Johnston <matt@ucc.asn.au>
parents: 454
diff changeset
392
1365
9aa6cd66b51d zlib can use m_malloc/m_free too
Matt Johnston <matt@ucc.asn.au>
parents: 1358
diff changeset
393 static void* dropbear_zalloc(void* UNUSED(opaque), uInt items, uInt size) {
9aa6cd66b51d zlib can use m_malloc/m_free too
Matt Johnston <matt@ucc.asn.au>
parents: 1358
diff changeset
394 return m_calloc(items, size);
9aa6cd66b51d zlib can use m_malloc/m_free too
Matt Johnston <matt@ucc.asn.au>
parents: 1358
diff changeset
395 }
9aa6cd66b51d zlib can use m_malloc/m_free too
Matt Johnston <matt@ucc.asn.au>
parents: 1358
diff changeset
396
9aa6cd66b51d zlib can use m_malloc/m_free too
Matt Johnston <matt@ucc.asn.au>
parents: 1358
diff changeset
397 static void dropbear_zfree(void* UNUSED(opaque), void* ptr) {
9aa6cd66b51d zlib can use m_malloc/m_free too
Matt Johnston <matt@ucc.asn.au>
parents: 1358
diff changeset
398 m_free(ptr);
9aa6cd66b51d zlib can use m_malloc/m_free too
Matt Johnston <matt@ucc.asn.au>
parents: 1358
diff changeset
399 }
9aa6cd66b51d zlib can use m_malloc/m_free too
Matt Johnston <matt@ucc.asn.au>
parents: 1358
diff changeset
400
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
401 /* Set up new zlib compression streams, close the old ones. Only
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
402 * called from gen_new_keys() */
771
a389a2a7aa96 Fix zlib for split newkeys
Matt Johnston <matt@ucc.asn.au>
parents: 753
diff changeset
403 static void gen_new_zstream_recv() {
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
404
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
405 /* create new zstreams */
534
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents: 502
diff changeset
406 if (ses.newkeys->recv.algo_comp == DROPBEAR_COMP_ZLIB
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents: 502
diff changeset
407 || 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
408 ses.newkeys->recv.zstream = (z_streamp)m_malloc(sizeof(z_stream));
1365
9aa6cd66b51d zlib can use m_malloc/m_free too
Matt Johnston <matt@ucc.asn.au>
parents: 1358
diff changeset
409 ses.newkeys->recv.zstream->zalloc = dropbear_zalloc;
9aa6cd66b51d zlib can use m_malloc/m_free too
Matt Johnston <matt@ucc.asn.au>
parents: 1358
diff changeset
410 ses.newkeys->recv.zstream->zfree = dropbear_zfree;
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
411
534
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents: 502
diff changeset
412 if (inflateInit(ses.newkeys->recv.zstream) != Z_OK) {
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
413 dropbear_exit("zlib error");
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
414 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
415 } else {
534
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents: 502
diff changeset
416 ses.newkeys->recv.zstream = NULL;
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
417 }
771
a389a2a7aa96 Fix zlib for split newkeys
Matt Johnston <matt@ucc.asn.au>
parents: 753
diff changeset
418 /* clean up old keys */
a389a2a7aa96 Fix zlib for split newkeys
Matt Johnston <matt@ucc.asn.au>
parents: 753
diff changeset
419 if (ses.keys->recv.zstream != NULL) {
a389a2a7aa96 Fix zlib for split newkeys
Matt Johnston <matt@ucc.asn.au>
parents: 753
diff changeset
420 if (inflateEnd(ses.keys->recv.zstream) == Z_STREAM_ERROR) {
a389a2a7aa96 Fix zlib for split newkeys
Matt Johnston <matt@ucc.asn.au>
parents: 753
diff changeset
421 /* Z_DATA_ERROR is ok, just means that stream isn't ended */
a389a2a7aa96 Fix zlib for split newkeys
Matt Johnston <matt@ucc.asn.au>
parents: 753
diff changeset
422 dropbear_exit("Crypto error");
a389a2a7aa96 Fix zlib for split newkeys
Matt Johnston <matt@ucc.asn.au>
parents: 753
diff changeset
423 }
a389a2a7aa96 Fix zlib for split newkeys
Matt Johnston <matt@ucc.asn.au>
parents: 753
diff changeset
424 m_free(ses.keys->recv.zstream);
a389a2a7aa96 Fix zlib for split newkeys
Matt Johnston <matt@ucc.asn.au>
parents: 753
diff changeset
425 }
a389a2a7aa96 Fix zlib for split newkeys
Matt Johnston <matt@ucc.asn.au>
parents: 753
diff changeset
426 }
a389a2a7aa96 Fix zlib for split newkeys
Matt Johnston <matt@ucc.asn.au>
parents: 753
diff changeset
427
a389a2a7aa96 Fix zlib for split newkeys
Matt Johnston <matt@ucc.asn.au>
parents: 753
diff changeset
428 static void gen_new_zstream_trans() {
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
429
534
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents: 502
diff changeset
430 if (ses.newkeys->trans.algo_comp == DROPBEAR_COMP_ZLIB
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents: 502
diff changeset
431 || ses.newkeys->trans.algo_comp == DROPBEAR_COMP_ZLIB_DELAY) {
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents: 502
diff changeset
432 ses.newkeys->trans.zstream = (z_streamp)m_malloc(sizeof(z_stream));
1365
9aa6cd66b51d zlib can use m_malloc/m_free too
Matt Johnston <matt@ucc.asn.au>
parents: 1358
diff changeset
433 ses.newkeys->trans.zstream->zalloc = dropbear_zalloc;
9aa6cd66b51d zlib can use m_malloc/m_free too
Matt Johnston <matt@ucc.asn.au>
parents: 1358
diff changeset
434 ses.newkeys->trans.zstream->zfree = dropbear_zfree;
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
435
555
daf52f813328 - Add option to change zlib windowBits/memLevel
Matt Johnston <matt@ucc.asn.au>
parents: 534
diff changeset
436 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
437 Z_DEFLATED, DROPBEAR_ZLIB_WINDOW_BITS,
daf52f813328 - Add option to change zlib windowBits/memLevel
Matt Johnston <matt@ucc.asn.au>
parents: 534
diff changeset
438 DROPBEAR_ZLIB_MEM_LEVEL, Z_DEFAULT_STRATEGY)
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
439 != Z_OK) {
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
440 dropbear_exit("zlib error");
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
441 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
442 } else {
534
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents: 502
diff changeset
443 ses.newkeys->trans.zstream = NULL;
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
444 }
501
d58c478bd399 Add support for [email protected] delayed compression.
Matt Johnston <matt@ucc.asn.au>
parents: 454
diff changeset
445
534
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents: 502
diff changeset
446 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
447 if (deflateEnd(ses.keys->trans.zstream) == Z_STREAM_ERROR) {
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
448 /* Z_DATA_ERROR is ok, just means that stream isn't ended */
594
a98a2138364a Improve capitalisation for all logged strings
Matt Johnston <matt@ucc.asn.au>
parents: 575
diff changeset
449 dropbear_exit("Crypto error");
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
450 }
534
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents: 502
diff changeset
451 m_free(ses.keys->trans.zstream);
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
452 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
453 }
501
d58c478bd399 Add support for [email protected] delayed compression.
Matt Johnston <matt@ucc.asn.au>
parents: 454
diff changeset
454 #endif /* DISABLE_ZLIB */
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
455
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
456
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
457 /* Executed upon receiving a kexinit message from the client to initiate
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
458 * key exchange. If we haven't already done so, we send the list of our
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
459 * preferred algorithms. The client's requested algorithms are processed,
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
460 * 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
461 * 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
462 * initiate the diffie-hellman key exchange */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
463 void recv_msg_kexinit() {
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
464
257
63601217f5ab * options.h, common-kex.c: fix support of 4096 byte host keys
Matt Johnston <matt@ucc.asn.au>
parents: 228
diff changeset
465 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
466 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
467 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
468
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
469 TRACE(("<- KEXINIT"))
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
470 TRACE(("enter recv_msg_kexinit"))
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
471
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
472 if (!ses.kexstate.sentkexinit) {
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
473 /* we need to send a kex packet */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
474 send_msg_kexinit();
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
475 TRACE(("continue recv_msg_kexinit: sent kexinit"))
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
476 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
477
257
63601217f5ab * options.h, common-kex.c: fix support of 4096 byte host keys
Matt Johnston <matt@ucc.asn.au>
parents: 228
diff changeset
478 /* start the kex hash */
63601217f5ab * options.h, common-kex.c: fix support of 4096 byte host keys
Matt Johnston <matt@ucc.asn.au>
parents: 228
diff changeset
479 local_ident_len = strlen(LOCAL_IDENT);
1108
2ebf450edc2d Turn sshsession's remoteident attribute into char *
Gaël PORTAY <gael.portay@gmail.com>
parents: 1094
diff changeset
480 remote_ident_len = strlen(ses.remoteident);
257
63601217f5ab * options.h, common-kex.c: fix support of 4096 byte host keys
Matt Johnston <matt@ucc.asn.au>
parents: 228
diff changeset
481
63601217f5ab * options.h, common-kex.c: fix support of 4096 byte host keys
Matt Johnston <matt@ucc.asn.au>
parents: 228
diff changeset
482 kexhashbuf_len = local_ident_len + remote_ident_len
63601217f5ab * options.h, common-kex.c: fix support of 4096 byte host keys
Matt Johnston <matt@ucc.asn.au>
parents: 228
diff changeset
483 + ses.transkexinit->len + ses.payload->len
63601217f5ab * options.h, common-kex.c: fix support of 4096 byte host keys
Matt Johnston <matt@ucc.asn.au>
parents: 228
diff changeset
484 + KEXHASHBUF_MAX_INTS;
63601217f5ab * options.h, common-kex.c: fix support of 4096 byte host keys
Matt Johnston <matt@ucc.asn.au>
parents: 228
diff changeset
485
63601217f5ab * options.h, common-kex.c: fix support of 4096 byte host keys
Matt Johnston <matt@ucc.asn.au>
parents: 228
diff changeset
486 ses.kexhashbuf = buf_new(kexhashbuf_len);
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
487
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
488 if (IS_DROPBEAR_CLIENT) {
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
489
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
490 /* read the peer's choice of algos */
33
f789045062e6 Progressing client support
Matt Johnston <matt@ucc.asn.au>
parents: 26
diff changeset
491 read_kex_algos();
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
492
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
493 /* V_C, the client's version string (CR and NL excluded) */
1250
2bb4c662d1c2 more hard tab
Francois Perrad <francois.perrad@gadz.org>
parents: 1175
diff changeset
494 buf_putstring(ses.kexhashbuf, LOCAL_IDENT, local_ident_len);
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
495 /* V_S, the server's version string (CR and NL excluded) */
1250
2bb4c662d1c2 more hard tab
Francois Perrad <francois.perrad@gadz.org>
parents: 1175
diff changeset
496 buf_putstring(ses.kexhashbuf, ses.remoteident, remote_ident_len);
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
497
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
498 /* I_C, the payload of the client's SSH_MSG_KEXINIT */
1250
2bb4c662d1c2 more hard tab
Francois Perrad <francois.perrad@gadz.org>
parents: 1175
diff changeset
499 buf_putstring(ses.kexhashbuf,
1122
aaf576b27a10 Merge pull request #13 from gazoo74/fix-warnings
Matt Johnston <matt@ucc.asn.au>
parents: 1108
diff changeset
500 (const char*)ses.transkexinit->data, ses.transkexinit->len);
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
501 /* I_S, the payload of the server's SSH_MSG_KEXINIT */
1250
2bb4c662d1c2 more hard tab
Francois Perrad <francois.perrad@gadz.org>
parents: 1175
diff changeset
502 buf_setpos(ses.payload, ses.payload_beginning);
2bb4c662d1c2 more hard tab
Francois Perrad <francois.perrad@gadz.org>
parents: 1175
diff changeset
503 buf_putstring(ses.kexhashbuf,
2bb4c662d1c2 more hard tab
Francois Perrad <francois.perrad@gadz.org>
parents: 1175
diff changeset
504 (const char*)buf_getptr(ses.payload, ses.payload->len-ses.payload->pos),
2bb4c662d1c2 more hard tab
Francois Perrad <francois.perrad@gadz.org>
parents: 1175
diff changeset
505 ses.payload->len-ses.payload->pos);
886
cbc73a5aefb0 requirenext doesn't need two values
Matt Johnston <matt@ucc.asn.au>
parents: 885
diff changeset
506 ses.requirenext = SSH_MSG_KEXDH_REPLY;
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
507 } else {
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
508 /* SERVER */
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
509
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
510 /* read the peer's choice of algos */
33
f789045062e6 Progressing client support
Matt Johnston <matt@ucc.asn.au>
parents: 26
diff changeset
511 read_kex_algos();
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
512 /* V_C, the client's version string (CR and NL excluded) */
1250
2bb4c662d1c2 more hard tab
Francois Perrad <francois.perrad@gadz.org>
parents: 1175
diff changeset
513 buf_putstring(ses.kexhashbuf, ses.remoteident, remote_ident_len);
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
514 /* V_S, the server's version string (CR and NL excluded) */
1250
2bb4c662d1c2 more hard tab
Francois Perrad <francois.perrad@gadz.org>
parents: 1175
diff changeset
515 buf_putstring(ses.kexhashbuf, LOCAL_IDENT, local_ident_len);
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
516
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
517 /* I_C, the payload of the client's SSH_MSG_KEXINIT */
1250
2bb4c662d1c2 more hard tab
Francois Perrad <francois.perrad@gadz.org>
parents: 1175
diff changeset
518 buf_setpos(ses.payload, ses.payload_beginning);
2bb4c662d1c2 more hard tab
Francois Perrad <francois.perrad@gadz.org>
parents: 1175
diff changeset
519 buf_putstring(ses.kexhashbuf,
2bb4c662d1c2 more hard tab
Francois Perrad <francois.perrad@gadz.org>
parents: 1175
diff changeset
520 (const char*)buf_getptr(ses.payload, ses.payload->len-ses.payload->pos),
2bb4c662d1c2 more hard tab
Francois Perrad <francois.perrad@gadz.org>
parents: 1175
diff changeset
521 ses.payload->len-ses.payload->pos);
257
63601217f5ab * options.h, common-kex.c: fix support of 4096 byte host keys
Matt Johnston <matt@ucc.asn.au>
parents: 228
diff changeset
522
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
523 /* I_S, the payload of the server's SSH_MSG_KEXINIT */
1250
2bb4c662d1c2 more hard tab
Francois Perrad <francois.perrad@gadz.org>
parents: 1175
diff changeset
524 buf_putstring(ses.kexhashbuf,
1122
aaf576b27a10 Merge pull request #13 from gazoo74/fix-warnings
Matt Johnston <matt@ucc.asn.au>
parents: 1108
diff changeset
525 (const char*)ses.transkexinit->data, ses.transkexinit->len);
257
63601217f5ab * options.h, common-kex.c: fix support of 4096 byte host keys
Matt Johnston <matt@ucc.asn.au>
parents: 228
diff changeset
526
886
cbc73a5aefb0 requirenext doesn't need two values
Matt Johnston <matt@ucc.asn.au>
parents: 885
diff changeset
527 ses.requirenext = SSH_MSG_KEXDH_INIT;
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
528 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
529
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
530 buf_free(ses.transkexinit);
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
531 ses.transkexinit = NULL;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
532 /* 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
533
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
534 ses.kexstate.recvkexinit = 1;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
535
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
536 TRACE(("leave recv_msg_kexinit"))
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
537 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
538
595
2895626d864f Add diffie-hellman-group14-sha1 KEX method
Matt Johnston <matt@ucc.asn.au>
parents: 594
diff changeset
539 static void load_dh_p(mp_int * dh_p)
2895626d864f Add diffie-hellman-group14-sha1 KEX method
Matt Johnston <matt@ucc.asn.au>
parents: 594
diff changeset
540 {
756
bf9dc2d9c2b1 more bits on ecc branch
Matt Johnston <matt@ucc.asn.au>
parents: 755
diff changeset
541 bytes_to_mp(dh_p, ses.newkeys->algo_kex->dh_p_bytes,
bf9dc2d9c2b1 more bits on ecc branch
Matt Johnston <matt@ucc.asn.au>
parents: 755
diff changeset
542 ses.newkeys->algo_kex->dh_p_len);
595
2895626d864f Add diffie-hellman-group14-sha1 KEX method
Matt Johnston <matt@ucc.asn.au>
parents: 594
diff changeset
543 }
2895626d864f Add diffie-hellman-group14-sha1 KEX method
Matt Johnston <matt@ucc.asn.au>
parents: 594
diff changeset
544
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
545 /* Initialises and generate one side of the diffie-hellman key exchange values.
603
3aa74a4d83ae Refer to RFCs rather than drafts, update some section references
Matt Johnston <matt@ucc.asn.au>
parents: 595
diff changeset
546 * See the transport rfc 4253 section 8 for details */
84
29a5c7c62350 default initialisers for mp_ints
Matt Johnston <matt@ucc.asn.au>
parents: 79
diff changeset
547 /* dh_pub and dh_priv MUST be already initialised */
755
b07eb3dc23ec refactor kexdh code a bit, start working on ecdh etc
Matt Johnston <matt@ucc.asn.au>
parents: 712
diff changeset
548 struct kex_dh_param *gen_kexdh_param() {
855
04ede40a529a - Some fixes for old compilers like tru64 v4 from Daniel Richard G.
Matt Johnston <matt@ucc.asn.au>
parents: 852
diff changeset
549 struct kex_dh_param *param = NULL;
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
550
84
29a5c7c62350 default initialisers for mp_ints
Matt Johnston <matt@ucc.asn.au>
parents: 79
diff changeset
551 DEF_MP_INT(dh_p);
29a5c7c62350 default initialisers for mp_ints
Matt Johnston <matt@ucc.asn.au>
parents: 79
diff changeset
552 DEF_MP_INT(dh_q);
29a5c7c62350 default initialisers for mp_ints
Matt Johnston <matt@ucc.asn.au>
parents: 79
diff changeset
553 DEF_MP_INT(dh_g);
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
554
739
d44325108d0e first_kex_packet_follows working, needs tidying
Matt Johnston <matt@ucc.asn.au>
parents: 712
diff changeset
555 TRACE(("enter gen_kexdh_vals"))
755
b07eb3dc23ec refactor kexdh code a bit, start working on ecdh etc
Matt Johnston <matt@ucc.asn.au>
parents: 712
diff changeset
556
855
04ede40a529a - Some fixes for old compilers like tru64 v4 from Daniel Richard G.
Matt Johnston <matt@ucc.asn.au>
parents: 852
diff changeset
557 param = m_malloc(sizeof(*param));
852
7540c0822374 Various cleanups and fixes for warnings
Matt Johnston <matt@ucc.asn.au>
parents: 848
diff changeset
558 m_mp_init_multi(&param->pub, &param->priv, &dh_g, &dh_p, &dh_q, NULL);
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
559
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
560 /* read the prime and generator*/
595
2895626d864f Add diffie-hellman-group14-sha1 KEX method
Matt Johnston <matt@ucc.asn.au>
parents: 594
diff changeset
561 load_dh_p(&dh_p);
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
562
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
563 if (mp_set_int(&dh_g, DH_G_VAL) != MP_OKAY) {
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
564 dropbear_exit("Diffie-Hellman error");
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
565 }
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
566
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
567 /* calculate q = (p-1)/2 */
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
568 /* dh_priv is just a temp var here */
755
b07eb3dc23ec refactor kexdh code a bit, start working on ecdh etc
Matt Johnston <matt@ucc.asn.au>
parents: 712
diff changeset
569 if (mp_sub_d(&dh_p, 1, &param->priv) != MP_OKAY) {
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
570 dropbear_exit("Diffie-Hellman error");
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
571 }
755
b07eb3dc23ec refactor kexdh code a bit, start working on ecdh etc
Matt Johnston <matt@ucc.asn.au>
parents: 712
diff changeset
572 if (mp_div_2(&param->priv, &dh_q) != MP_OKAY) {
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
573 dropbear_exit("Diffie-Hellman error");
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
574 }
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
575
188
c9483550701b - refactored random mp_int generation and byte->mp_int code
Matt Johnston <matt@ucc.asn.au>
parents: 179
diff changeset
576 /* Generate a private portion 0 < dh_priv < dh_q */
755
b07eb3dc23ec refactor kexdh code a bit, start working on ecdh etc
Matt Johnston <matt@ucc.asn.au>
parents: 712
diff changeset
577 gen_random_mpint(&dh_q, &param->priv);
26
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 /* f = g^y mod p */
755
b07eb3dc23ec refactor kexdh code a bit, start working on ecdh etc
Matt Johnston <matt@ucc.asn.au>
parents: 712
diff changeset
580 if (mp_exptmod(&dh_g, &param->priv, &dh_p, &param->pub) != MP_OKAY) {
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
581 dropbear_exit("Diffie-Hellman error");
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
582 }
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
583 mp_clear_multi(&dh_g, &dh_p, &dh_q, NULL);
755
b07eb3dc23ec refactor kexdh code a bit, start working on ecdh etc
Matt Johnston <matt@ucc.asn.au>
parents: 712
diff changeset
584 return param;
b07eb3dc23ec refactor kexdh code a bit, start working on ecdh etc
Matt Johnston <matt@ucc.asn.au>
parents: 712
diff changeset
585 }
b07eb3dc23ec refactor kexdh code a bit, start working on ecdh etc
Matt Johnston <matt@ucc.asn.au>
parents: 712
diff changeset
586
b07eb3dc23ec refactor kexdh code a bit, start working on ecdh etc
Matt Johnston <matt@ucc.asn.au>
parents: 712
diff changeset
587 void free_kexdh_param(struct kex_dh_param *param)
b07eb3dc23ec refactor kexdh code a bit, start working on ecdh etc
Matt Johnston <matt@ucc.asn.au>
parents: 712
diff changeset
588 {
b07eb3dc23ec refactor kexdh code a bit, start working on ecdh etc
Matt Johnston <matt@ucc.asn.au>
parents: 712
diff changeset
589 mp_clear_multi(&param->pub, &param->priv, NULL);
b07eb3dc23ec refactor kexdh code a bit, start working on ecdh etc
Matt Johnston <matt@ucc.asn.au>
parents: 712
diff changeset
590 m_free(param);
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
591 }
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 /* 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
594 * of dh_e/dh_f etc. Hence these arguments:
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
595 * dh_pub_us is 'e' for the client, 'f' for the server. dh_pub_them is
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
596 * vice-versa. dh_priv is the x/y value corresponding to dh_pub_us */
755
b07eb3dc23ec refactor kexdh code a bit, start working on ecdh etc
Matt Johnston <matt@ucc.asn.au>
parents: 712
diff changeset
597 void kexdh_comb_key(struct kex_dh_param *param, mp_int *dh_pub_them,
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
598 sign_key *hostkey) {
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
599
1013
a1e79ffa5862 Tighten validation of DH values. Odds of x==0 being generated are
Matt Johnston <matt@ucc.asn.au>
parents: 996
diff changeset
600 DEF_MP_INT(dh_p);
a1e79ffa5862 Tighten validation of DH values. Odds of x==0 being generated are
Matt Johnston <matt@ucc.asn.au>
parents: 996
diff changeset
601 DEF_MP_INT(dh_p_min1);
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
602 mp_int *dh_e = NULL, *dh_f = NULL;
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
603
1013
a1e79ffa5862 Tighten validation of DH values. Odds of x==0 being generated are
Matt Johnston <matt@ucc.asn.au>
parents: 996
diff changeset
604 m_mp_init_multi(&dh_p, &dh_p_min1, NULL);
595
2895626d864f Add diffie-hellman-group14-sha1 KEX method
Matt Johnston <matt@ucc.asn.au>
parents: 594
diff changeset
605 load_dh_p(&dh_p);
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
606
1013
a1e79ffa5862 Tighten validation of DH values. Odds of x==0 being generated are
Matt Johnston <matt@ucc.asn.au>
parents: 996
diff changeset
607 if (mp_sub_d(&dh_p, 1, &dh_p_min1) != MP_OKAY) {
a1e79ffa5862 Tighten validation of DH values. Odds of x==0 being generated are
Matt Johnston <matt@ucc.asn.au>
parents: 996
diff changeset
608 dropbear_exit("Diffie-Hellman error");
a1e79ffa5862 Tighten validation of DH values. Odds of x==0 being generated are
Matt Johnston <matt@ucc.asn.au>
parents: 996
diff changeset
609 }
a1e79ffa5862 Tighten validation of DH values. Odds of x==0 being generated are
Matt Johnston <matt@ucc.asn.au>
parents: 996
diff changeset
610
a1e79ffa5862 Tighten validation of DH values. Odds of x==0 being generated are
Matt Johnston <matt@ucc.asn.au>
parents: 996
diff changeset
611 /* Check that dh_pub_them (dh_e or dh_f) is in the range [2, p-2] */
a1e79ffa5862 Tighten validation of DH values. Odds of x==0 being generated are
Matt Johnston <matt@ucc.asn.au>
parents: 996
diff changeset
612 if (mp_cmp(dh_pub_them, &dh_p_min1) != MP_LT
a1e79ffa5862 Tighten validation of DH values. Odds of x==0 being generated are
Matt Johnston <matt@ucc.asn.au>
parents: 996
diff changeset
613 || mp_cmp_d(dh_pub_them, 1) != MP_GT) {
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
614 dropbear_exit("Diffie-Hellman error");
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
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
617 /* K = e^y mod p = f^x mod p */
805
724c3e0c8734 Add m_mp_alloc_init_multi() helper
Matt Johnston <matt@ucc.asn.au>
parents: 801
diff changeset
618 m_mp_alloc_init_multi(&ses.dh_K, NULL);
755
b07eb3dc23ec refactor kexdh code a bit, start working on ecdh etc
Matt Johnston <matt@ucc.asn.au>
parents: 712
diff changeset
619 if (mp_exptmod(dh_pub_them, &param->priv, &dh_p, ses.dh_K) != MP_OKAY) {
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
620 dropbear_exit("Diffie-Hellman error");
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
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
623 /* clear no longer needed vars */
1013
a1e79ffa5862 Tighten validation of DH values. Odds of x==0 being generated are
Matt Johnston <matt@ucc.asn.au>
parents: 996
diff changeset
624 mp_clear_multi(&dh_p, &dh_p_min1, NULL);
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
625
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
626 /* 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
627 * not vice-versaing for client/server */
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
628 if (IS_DROPBEAR_CLIENT) {
755
b07eb3dc23ec refactor kexdh code a bit, start working on ecdh etc
Matt Johnston <matt@ucc.asn.au>
parents: 712
diff changeset
629 dh_e = &param->pub;
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
630 dh_f = dh_pub_them;
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
631 } else {
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
632 dh_e = dh_pub_them;
755
b07eb3dc23ec refactor kexdh code a bit, start working on ecdh etc
Matt Johnston <matt@ucc.asn.au>
parents: 712
diff changeset
633 dh_f = &param->pub;
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
634 }
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
635
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
636 /* 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
637 /* K_S, the host key */
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
638 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
639 /* e, exchange value sent by the client */
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
640 buf_putmpint(ses.kexhashbuf, dh_e);
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
641 /* f, exchange value sent by the server */
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
642 buf_putmpint(ses.kexhashbuf, dh_f);
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
643 /* K, the shared secret */
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
644 buf_putmpint(ses.kexhashbuf, ses.dh_K);
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 /* calculate the hash H to sign */
761
ac2158e3e403 ecc kind of works, needs fixing/testing
Matt Johnston <matt@ucc.asn.au>
parents: 759
diff changeset
647 finish_kexhashbuf();
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
648 }
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
649
1295
750ec4ec4cbe Convert #ifdef to #if, other build changes
Matt Johnston <matt@ucc.asn.au>
parents: 1276
diff changeset
650 #if DROPBEAR_ECDH
755
b07eb3dc23ec refactor kexdh code a bit, start working on ecdh etc
Matt Johnston <matt@ucc.asn.au>
parents: 712
diff changeset
651 struct kex_ecdh_param *gen_kexecdh_param() {
b07eb3dc23ec refactor kexdh code a bit, start working on ecdh etc
Matt Johnston <matt@ucc.asn.au>
parents: 712
diff changeset
652 struct kex_ecdh_param *param = m_malloc(sizeof(*param));
756
bf9dc2d9c2b1 more bits on ecc branch
Matt Johnston <matt@ucc.asn.au>
parents: 755
diff changeset
653 if (ecc_make_key_ex(NULL, dropbear_ltc_prng,
759
76fba0856749 More changes for KEX and ECDH. Set up hash descriptors, make ECC code work,
Matt Johnston <matt@ucc.asn.au>
parents: 757
diff changeset
654 &param->key, ses.newkeys->algo_kex->ecc_curve->dp) != CRYPT_OK) {
76fba0856749 More changes for KEX and ECDH. Set up hash descriptors, make ECC code work,
Matt Johnston <matt@ucc.asn.au>
parents: 757
diff changeset
655 dropbear_exit("ECC error");
756
bf9dc2d9c2b1 more bits on ecc branch
Matt Johnston <matt@ucc.asn.au>
parents: 755
diff changeset
656 }
bf9dc2d9c2b1 more bits on ecc branch
Matt Johnston <matt@ucc.asn.au>
parents: 755
diff changeset
657 return param;
bf9dc2d9c2b1 more bits on ecc branch
Matt Johnston <matt@ucc.asn.au>
parents: 755
diff changeset
658 }
bf9dc2d9c2b1 more bits on ecc branch
Matt Johnston <matt@ucc.asn.au>
parents: 755
diff changeset
659
bf9dc2d9c2b1 more bits on ecc branch
Matt Johnston <matt@ucc.asn.au>
parents: 755
diff changeset
660 void free_kexecdh_param(struct kex_ecdh_param *param) {
bf9dc2d9c2b1 more bits on ecc branch
Matt Johnston <matt@ucc.asn.au>
parents: 755
diff changeset
661 ecc_free(&param->key);
bf9dc2d9c2b1 more bits on ecc branch
Matt Johnston <matt@ucc.asn.au>
parents: 755
diff changeset
662 m_free(param);
bf9dc2d9c2b1 more bits on ecc branch
Matt Johnston <matt@ucc.asn.au>
parents: 755
diff changeset
663
755
b07eb3dc23ec refactor kexdh code a bit, start working on ecdh etc
Matt Johnston <matt@ucc.asn.au>
parents: 712
diff changeset
664 }
b07eb3dc23ec refactor kexdh code a bit, start working on ecdh etc
Matt Johnston <matt@ucc.asn.au>
parents: 712
diff changeset
665 void kexecdh_comb_key(struct kex_ecdh_param *param, buffer *pub_them,
756
bf9dc2d9c2b1 more bits on ecc branch
Matt Johnston <matt@ucc.asn.au>
parents: 755
diff changeset
666 sign_key *hostkey) {
759
76fba0856749 More changes for KEX and ECDH. Set up hash descriptors, make ECC code work,
Matt Johnston <matt@ucc.asn.au>
parents: 757
diff changeset
667 const struct dropbear_kex *algo_kex = ses.newkeys->algo_kex;
857
c19acba28590 use oldstyle comments
Matt Johnston <matt@ucc.asn.au>
parents: 855
diff changeset
668 /* public keys from client and server */
756
bf9dc2d9c2b1 more bits on ecc branch
Matt Johnston <matt@ucc.asn.au>
parents: 755
diff changeset
669 ecc_key *Q_C, *Q_S, *Q_them;
bf9dc2d9c2b1 more bits on ecc branch
Matt Johnston <matt@ucc.asn.au>
parents: 755
diff changeset
670
765
5503e05ab3a4 - Rename buf_put_ecc_pubkey_string() to buf_put_ecc_raw_pubkey_string()
Matt Johnston <matt@ucc.asn.au>
parents: 763
diff changeset
671 Q_them = buf_get_ecc_raw_pubkey(pub_them, algo_kex->ecc_curve);
1128
a9e074b78cd5 check ecc key return, fix null pointer crash
Matt Johnston <matt@ucc.asn.au>
parents: 1124
diff changeset
672 if (Q_them == NULL) {
a9e074b78cd5 check ecc key return, fix null pointer crash
Matt Johnston <matt@ucc.asn.au>
parents: 1124
diff changeset
673 dropbear_exit("ECC error");
a9e074b78cd5 check ecc key return, fix null pointer crash
Matt Johnston <matt@ucc.asn.au>
parents: 1124
diff changeset
674 }
757
230666086711 ecc key import function
Matt Johnston <matt@ucc.asn.au>
parents: 756
diff changeset
675
761
ac2158e3e403 ecc kind of works, needs fixing/testing
Matt Johnston <matt@ucc.asn.au>
parents: 759
diff changeset
676 ses.dh_K = dropbear_ecc_shared_secret(Q_them, &param->key);
756
bf9dc2d9c2b1 more bits on ecc branch
Matt Johnston <matt@ucc.asn.au>
parents: 755
diff changeset
677
848
6c69e7df3621 curve25519
Matt Johnston <matt@ucc.asn.au>
parents: 805
diff changeset
678 /* Create the remainder of the hash buffer, to generate the exchange hash
6c69e7df3621 curve25519
Matt Johnston <matt@ucc.asn.au>
parents: 805
diff changeset
679 See RFC5656 section 4 page 7 */
756
bf9dc2d9c2b1 more bits on ecc branch
Matt Johnston <matt@ucc.asn.au>
parents: 755
diff changeset
680 if (IS_DROPBEAR_CLIENT) {
761
ac2158e3e403 ecc kind of works, needs fixing/testing
Matt Johnston <matt@ucc.asn.au>
parents: 759
diff changeset
681 Q_C = &param->key;
759
76fba0856749 More changes for KEX and ECDH. Set up hash descriptors, make ECC code work,
Matt Johnston <matt@ucc.asn.au>
parents: 757
diff changeset
682 Q_S = Q_them;
756
bf9dc2d9c2b1 more bits on ecc branch
Matt Johnston <matt@ucc.asn.au>
parents: 755
diff changeset
683 } else {
759
76fba0856749 More changes for KEX and ECDH. Set up hash descriptors, make ECC code work,
Matt Johnston <matt@ucc.asn.au>
parents: 757
diff changeset
684 Q_C = Q_them;
761
ac2158e3e403 ecc kind of works, needs fixing/testing
Matt Johnston <matt@ucc.asn.au>
parents: 759
diff changeset
685 Q_S = &param->key;
756
bf9dc2d9c2b1 more bits on ecc branch
Matt Johnston <matt@ucc.asn.au>
parents: 755
diff changeset
686 }
bf9dc2d9c2b1 more bits on ecc branch
Matt Johnston <matt@ucc.asn.au>
parents: 755
diff changeset
687
bf9dc2d9c2b1 more bits on ecc branch
Matt Johnston <matt@ucc.asn.au>
parents: 755
diff changeset
688 /* K_S, the host key */
bf9dc2d9c2b1 more bits on ecc branch
Matt Johnston <matt@ucc.asn.au>
parents: 755
diff changeset
689 buf_put_pub_key(ses.kexhashbuf, hostkey, ses.newkeys->algo_hostkey);
759
76fba0856749 More changes for KEX and ECDH. Set up hash descriptors, make ECC code work,
Matt Johnston <matt@ucc.asn.au>
parents: 757
diff changeset
690 /* Q_C, client's ephemeral public key octet string */
765
5503e05ab3a4 - Rename buf_put_ecc_pubkey_string() to buf_put_ecc_raw_pubkey_string()
Matt Johnston <matt@ucc.asn.au>
parents: 763
diff changeset
691 buf_put_ecc_raw_pubkey_string(ses.kexhashbuf, Q_C);
759
76fba0856749 More changes for KEX and ECDH. Set up hash descriptors, make ECC code work,
Matt Johnston <matt@ucc.asn.au>
parents: 757
diff changeset
692 /* Q_S, server's ephemeral public key octet string */
765
5503e05ab3a4 - Rename buf_put_ecc_pubkey_string() to buf_put_ecc_raw_pubkey_string()
Matt Johnston <matt@ucc.asn.au>
parents: 763
diff changeset
693 buf_put_ecc_raw_pubkey_string(ses.kexhashbuf, Q_S);
756
bf9dc2d9c2b1 more bits on ecc branch
Matt Johnston <matt@ucc.asn.au>
parents: 755
diff changeset
694 /* K, the shared secret */
bf9dc2d9c2b1 more bits on ecc branch
Matt Johnston <matt@ucc.asn.au>
parents: 755
diff changeset
695 buf_putmpint(ses.kexhashbuf, ses.dh_K);
bf9dc2d9c2b1 more bits on ecc branch
Matt Johnston <matt@ucc.asn.au>
parents: 755
diff changeset
696
bf9dc2d9c2b1 more bits on ecc branch
Matt Johnston <matt@ucc.asn.au>
parents: 755
diff changeset
697 /* calculate the hash H to sign */
761
ac2158e3e403 ecc kind of works, needs fixing/testing
Matt Johnston <matt@ucc.asn.au>
parents: 759
diff changeset
698 finish_kexhashbuf();
ac2158e3e403 ecc kind of works, needs fixing/testing
Matt Johnston <matt@ucc.asn.au>
parents: 759
diff changeset
699 }
848
6c69e7df3621 curve25519
Matt Johnston <matt@ucc.asn.au>
parents: 805
diff changeset
700 #endif /* DROPBEAR_ECDH */
6c69e7df3621 curve25519
Matt Johnston <matt@ucc.asn.au>
parents: 805
diff changeset
701
1295
750ec4ec4cbe Convert #ifdef to #if, other build changes
Matt Johnston <matt@ucc.asn.au>
parents: 1276
diff changeset
702 #if DROPBEAR_CURVE25519
848
6c69e7df3621 curve25519
Matt Johnston <matt@ucc.asn.au>
parents: 805
diff changeset
703 struct kex_curve25519_param *gen_kexcurve25519_param () {
6c69e7df3621 curve25519
Matt Johnston <matt@ucc.asn.au>
parents: 805
diff changeset
704 /* Per http://cr.yp.to/ecdh.html */
6c69e7df3621 curve25519
Matt Johnston <matt@ucc.asn.au>
parents: 805
diff changeset
705 struct kex_curve25519_param *param = m_malloc(sizeof(*param));
6c69e7df3621 curve25519
Matt Johnston <matt@ucc.asn.au>
parents: 805
diff changeset
706 const unsigned char basepoint[32] = {9};
6c69e7df3621 curve25519
Matt Johnston <matt@ucc.asn.au>
parents: 805
diff changeset
707
6c69e7df3621 curve25519
Matt Johnston <matt@ucc.asn.au>
parents: 805
diff changeset
708 genrandom(param->priv, CURVE25519_LEN);
6c69e7df3621 curve25519
Matt Johnston <matt@ucc.asn.au>
parents: 805
diff changeset
709 param->priv[0] &= 248;
6c69e7df3621 curve25519
Matt Johnston <matt@ucc.asn.au>
parents: 805
diff changeset
710 param->priv[31] &= 127;
6c69e7df3621 curve25519
Matt Johnston <matt@ucc.asn.au>
parents: 805
diff changeset
711 param->priv[31] |= 64;
6c69e7df3621 curve25519
Matt Johnston <matt@ucc.asn.au>
parents: 805
diff changeset
712
6c69e7df3621 curve25519
Matt Johnston <matt@ucc.asn.au>
parents: 805
diff changeset
713 curve25519_donna(param->pub, param->priv, basepoint);
6c69e7df3621 curve25519
Matt Johnston <matt@ucc.asn.au>
parents: 805
diff changeset
714
6c69e7df3621 curve25519
Matt Johnston <matt@ucc.asn.au>
parents: 805
diff changeset
715 return param;
6c69e7df3621 curve25519
Matt Johnston <matt@ucc.asn.au>
parents: 805
diff changeset
716 }
6c69e7df3621 curve25519
Matt Johnston <matt@ucc.asn.au>
parents: 805
diff changeset
717
6c69e7df3621 curve25519
Matt Johnston <matt@ucc.asn.au>
parents: 805
diff changeset
718 void free_kexcurve25519_param(struct kex_curve25519_param *param)
6c69e7df3621 curve25519
Matt Johnston <matt@ucc.asn.au>
parents: 805
diff changeset
719 {
6c69e7df3621 curve25519
Matt Johnston <matt@ucc.asn.au>
parents: 805
diff changeset
720 m_burn(param->priv, CURVE25519_LEN);
6c69e7df3621 curve25519
Matt Johnston <matt@ucc.asn.au>
parents: 805
diff changeset
721 m_free(param);
6c69e7df3621 curve25519
Matt Johnston <matt@ucc.asn.au>
parents: 805
diff changeset
722 }
6c69e7df3621 curve25519
Matt Johnston <matt@ucc.asn.au>
parents: 805
diff changeset
723
1459
06d52bcb8094 Pointer parameter could be declared as pointing to const
Francois Perrad <francois.perrad@gadz.org>
parents: 1402
diff changeset
724 void kexcurve25519_comb_key(const struct kex_curve25519_param *param, const buffer *buf_pub_them,
848
6c69e7df3621 curve25519
Matt Johnston <matt@ucc.asn.au>
parents: 805
diff changeset
725 sign_key *hostkey) {
852
7540c0822374 Various cleanups and fixes for warnings
Matt Johnston <matt@ucc.asn.au>
parents: 848
diff changeset
726 unsigned char out[CURVE25519_LEN];
848
6c69e7df3621 curve25519
Matt Johnston <matt@ucc.asn.au>
parents: 805
diff changeset
727 const unsigned char* Q_C = NULL;
6c69e7df3621 curve25519
Matt Johnston <matt@ucc.asn.au>
parents: 805
diff changeset
728 const unsigned char* Q_S = NULL;
1175
1b8afc698e39 check for zero K value from curve25519
Matt Johnston <matt@ucc.asn.au>
parents: 1128
diff changeset
729 char zeroes[CURVE25519_LEN] = {0};
848
6c69e7df3621 curve25519
Matt Johnston <matt@ucc.asn.au>
parents: 805
diff changeset
730
6c69e7df3621 curve25519
Matt Johnston <matt@ucc.asn.au>
parents: 805
diff changeset
731 if (buf_pub_them->len != CURVE25519_LEN)
6c69e7df3621 curve25519
Matt Johnston <matt@ucc.asn.au>
parents: 805
diff changeset
732 {
6c69e7df3621 curve25519
Matt Johnston <matt@ucc.asn.au>
parents: 805
diff changeset
733 dropbear_exit("Bad curve25519");
6c69e7df3621 curve25519
Matt Johnston <matt@ucc.asn.au>
parents: 805
diff changeset
734 }
6c69e7df3621 curve25519
Matt Johnston <matt@ucc.asn.au>
parents: 805
diff changeset
735
6c69e7df3621 curve25519
Matt Johnston <matt@ucc.asn.au>
parents: 805
diff changeset
736 curve25519_donna(out, param->priv, buf_pub_them->data);
1175
1b8afc698e39 check for zero K value from curve25519
Matt Johnston <matt@ucc.asn.au>
parents: 1128
diff changeset
737
1b8afc698e39 check for zero K value from curve25519
Matt Johnston <matt@ucc.asn.au>
parents: 1128
diff changeset
738 if (constant_time_memcmp(zeroes, out, CURVE25519_LEN) == 0) {
1b8afc698e39 check for zero K value from curve25519
Matt Johnston <matt@ucc.asn.au>
parents: 1128
diff changeset
739 dropbear_exit("Bad curve25519");
1b8afc698e39 check for zero K value from curve25519
Matt Johnston <matt@ucc.asn.au>
parents: 1128
diff changeset
740 }
1b8afc698e39 check for zero K value from curve25519
Matt Johnston <matt@ucc.asn.au>
parents: 1128
diff changeset
741
852
7540c0822374 Various cleanups and fixes for warnings
Matt Johnston <matt@ucc.asn.au>
parents: 848
diff changeset
742 m_mp_alloc_init_multi(&ses.dh_K, NULL);
848
6c69e7df3621 curve25519
Matt Johnston <matt@ucc.asn.au>
parents: 805
diff changeset
743 bytes_to_mp(ses.dh_K, out, CURVE25519_LEN);
852
7540c0822374 Various cleanups and fixes for warnings
Matt Johnston <matt@ucc.asn.au>
parents: 848
diff changeset
744 m_burn(out, sizeof(out));
848
6c69e7df3621 curve25519
Matt Johnston <matt@ucc.asn.au>
parents: 805
diff changeset
745
6c69e7df3621 curve25519
Matt Johnston <matt@ucc.asn.au>
parents: 805
diff changeset
746 /* Create the remainder of the hash buffer, to generate the exchange hash.
6c69e7df3621 curve25519
Matt Johnston <matt@ucc.asn.au>
parents: 805
diff changeset
747 See RFC5656 section 4 page 7 */
6c69e7df3621 curve25519
Matt Johnston <matt@ucc.asn.au>
parents: 805
diff changeset
748 if (IS_DROPBEAR_CLIENT) {
6c69e7df3621 curve25519
Matt Johnston <matt@ucc.asn.au>
parents: 805
diff changeset
749 Q_C = param->pub;
6c69e7df3621 curve25519
Matt Johnston <matt@ucc.asn.au>
parents: 805
diff changeset
750 Q_S = buf_pub_them->data;
6c69e7df3621 curve25519
Matt Johnston <matt@ucc.asn.au>
parents: 805
diff changeset
751 } else {
6c69e7df3621 curve25519
Matt Johnston <matt@ucc.asn.au>
parents: 805
diff changeset
752 Q_S = param->pub;
6c69e7df3621 curve25519
Matt Johnston <matt@ucc.asn.au>
parents: 805
diff changeset
753 Q_C = buf_pub_them->data;
6c69e7df3621 curve25519
Matt Johnston <matt@ucc.asn.au>
parents: 805
diff changeset
754 }
6c69e7df3621 curve25519
Matt Johnston <matt@ucc.asn.au>
parents: 805
diff changeset
755
6c69e7df3621 curve25519
Matt Johnston <matt@ucc.asn.au>
parents: 805
diff changeset
756 /* K_S, the host key */
6c69e7df3621 curve25519
Matt Johnston <matt@ucc.asn.au>
parents: 805
diff changeset
757 buf_put_pub_key(ses.kexhashbuf, hostkey, ses.newkeys->algo_hostkey);
6c69e7df3621 curve25519
Matt Johnston <matt@ucc.asn.au>
parents: 805
diff changeset
758 /* Q_C, client's ephemeral public key octet string */
1122
aaf576b27a10 Merge pull request #13 from gazoo74/fix-warnings
Matt Johnston <matt@ucc.asn.au>
parents: 1108
diff changeset
759 buf_putstring(ses.kexhashbuf, (const char*)Q_C, CURVE25519_LEN);
848
6c69e7df3621 curve25519
Matt Johnston <matt@ucc.asn.au>
parents: 805
diff changeset
760 /* Q_S, server's ephemeral public key octet string */
1122
aaf576b27a10 Merge pull request #13 from gazoo74/fix-warnings
Matt Johnston <matt@ucc.asn.au>
parents: 1108
diff changeset
761 buf_putstring(ses.kexhashbuf, (const char*)Q_S, CURVE25519_LEN);
848
6c69e7df3621 curve25519
Matt Johnston <matt@ucc.asn.au>
parents: 805
diff changeset
762 /* K, the shared secret */
6c69e7df3621 curve25519
Matt Johnston <matt@ucc.asn.au>
parents: 805
diff changeset
763 buf_putmpint(ses.kexhashbuf, ses.dh_K);
6c69e7df3621 curve25519
Matt Johnston <matt@ucc.asn.au>
parents: 805
diff changeset
764
6c69e7df3621 curve25519
Matt Johnston <matt@ucc.asn.au>
parents: 805
diff changeset
765 /* calculate the hash H to sign */
6c69e7df3621 curve25519
Matt Johnston <matt@ucc.asn.au>
parents: 805
diff changeset
766 finish_kexhashbuf();
6c69e7df3621 curve25519
Matt Johnston <matt@ucc.asn.au>
parents: 805
diff changeset
767 }
6c69e7df3621 curve25519
Matt Johnston <matt@ucc.asn.au>
parents: 805
diff changeset
768 #endif /* DROPBEAR_CURVE25519 */
6c69e7df3621 curve25519
Matt Johnston <matt@ucc.asn.au>
parents: 805
diff changeset
769
6c69e7df3621 curve25519
Matt Johnston <matt@ucc.asn.au>
parents: 805
diff changeset
770
1456
a90fdd2d2ed8 add fuzzer-preauth_nomaths
Matt Johnston <matt@ucc.asn.au>
parents: 1411
diff changeset
771 void finish_kexhashbuf(void) {
761
ac2158e3e403 ecc kind of works, needs fixing/testing
Matt Johnston <matt@ucc.asn.au>
parents: 759
diff changeset
772 hash_state hs;
793
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 766
diff changeset
773 const struct ltc_hash_descriptor *hash_desc = ses.newkeys->algo_kex->hash_desc;
761
ac2158e3e403 ecc kind of works, needs fixing/testing
Matt Johnston <matt@ucc.asn.au>
parents: 759
diff changeset
774
793
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 766
diff changeset
775 hash_desc->init(&hs);
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
776 buf_setpos(ses.kexhashbuf, 0);
793
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 766
diff changeset
777 hash_desc->process(&hs, buf_getptr(ses.kexhashbuf, ses.kexhashbuf->len),
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
778 ses.kexhashbuf->len);
793
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 766
diff changeset
779 ses.hash = buf_new(hash_desc->hashsize);
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 766
diff changeset
780 hash_desc->done(&hs, buf_getwriteptr(ses.hash, hash_desc->hashsize));
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 766
diff changeset
781 buf_setlen(ses.hash, hash_desc->hashsize);
35
0ad5fb979f42 set the isserver flag (oops)
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
782
1402
553c6bb80265 fix DEBUG_* condition
Francois Perrad <francois.perrad@gadz.org>
parents: 1295
diff changeset
783 #if defined(DEBUG_KEXHASH) && DEBUG_TRACE
907
4a74c58e11fc Make some debug info conditional
Matt Johnston <matt@ucc.asn.au>
parents: 886
diff changeset
784 if (!debug_trace) {
4a74c58e11fc Make some debug info conditional
Matt Johnston <matt@ucc.asn.au>
parents: 886
diff changeset
785 printhex("kexhashbuf", ses.kexhashbuf->data, ses.kexhashbuf->len);
4a74c58e11fc Make some debug info conditional
Matt Johnston <matt@ucc.asn.au>
parents: 886
diff changeset
786 printhex("kexhash", ses.hash->data, ses.hash->len);
4a74c58e11fc Make some debug info conditional
Matt Johnston <matt@ucc.asn.au>
parents: 886
diff changeset
787 }
883
ff597bf2cfb0 DROPBEAR_CLI_AUTH_IMMEDIATE fixed, now enabled by default
Matt Johnston <matt@ucc.asn.au>
parents: 858
diff changeset
788 #endif
ff597bf2cfb0 DROPBEAR_CLI_AUTH_IMMEDIATE fixed, now enabled by default
Matt Johnston <matt@ucc.asn.au>
parents: 858
diff changeset
789
35
0ad5fb979f42 set the isserver flag (oops)
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
790 buf_burn(ses.kexhashbuf);
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
791 buf_free(ses.kexhashbuf);
987
ed85797bbc85 clear hash state memory after use
Matt Johnston <matt@ucc.asn.au>
parents: 928
diff changeset
792 m_burn(&hs, sizeof(hash_state));
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
793 ses.kexhashbuf = NULL;
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
794
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
795 /* first time around, we set the session_id to H */
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
796 if (ses.session_id == NULL) {
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
797 /* create the session_id, this never needs freeing */
761
ac2158e3e403 ecc kind of works, needs fixing/testing
Matt Johnston <matt@ucc.asn.au>
parents: 759
diff changeset
798 ses.session_id = buf_newcopy(ses.hash);
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
799 }
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
800 }
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
801
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
802 /* 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
803 * algos for the client or server. */
33
f789045062e6 Progressing client support
Matt Johnston <matt@ucc.asn.au>
parents: 26
diff changeset
804 static void read_kex_algos() {
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
805
36
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
806 /* for asymmetry */
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
807 algo_type * c2s_hash_algo = NULL;
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
808 algo_type * s2c_hash_algo = NULL;
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
809 algo_type * c2s_cipher_algo = NULL;
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
810 algo_type * s2c_cipher_algo = NULL;
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
811 algo_type * c2s_comp_algo = NULL;
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
812 algo_type * s2c_comp_algo = NULL;
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
813 /* the generic one */
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
814 algo_type * algo = NULL;
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
815
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
816 /* which algo couldn't match */
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
817 char * erralgo = NULL;
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
818
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
819 int goodguess = 0;
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
820 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
821 true after */
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
822
1295
750ec4ec4cbe Convert #ifdef to #if, other build changes
Matt Johnston <matt@ucc.asn.au>
parents: 1276
diff changeset
823 #if DROPBEAR_KEXGUESS2
740
3062da90dab8 Add kexguess2 behaviour
Matt Johnston <matt@ucc.asn.au>
parents: 739
diff changeset
824 enum kexguess2_used kexguess2 = KEXGUESS2_LOOK;
746
465fefc4f6e0 Put some #ifdef options around first-follows options in case they
Matt Johnston <matt@ucc.asn.au>
parents: 741
diff changeset
825 #else
465fefc4f6e0 Put some #ifdef options around first-follows options in case they
Matt Johnston <matt@ucc.asn.au>
parents: 741
diff changeset
826 enum kexguess2_used kexguess2 = KEXGUESS2_NO;
465fefc4f6e0 Put some #ifdef options around first-follows options in case they
Matt Johnston <matt@ucc.asn.au>
parents: 741
diff changeset
827 #endif
740
3062da90dab8 Add kexguess2 behaviour
Matt Johnston <matt@ucc.asn.au>
parents: 739
diff changeset
828
855
04ede40a529a - Some fixes for old compilers like tru64 v4 from Daniel Richard G.
Matt Johnston <matt@ucc.asn.au>
parents: 852
diff changeset
829 buf_incrpos(ses.payload, 16); /* start after the cookie */
04ede40a529a - Some fixes for old compilers like tru64 v4 from Daniel Richard G.
Matt Johnston <matt@ucc.asn.au>
parents: 852
diff changeset
830
04ede40a529a - Some fixes for old compilers like tru64 v4 from Daniel Richard G.
Matt Johnston <matt@ucc.asn.au>
parents: 852
diff changeset
831 memset(ses.newkeys, 0x0, sizeof(*ses.newkeys));
04ede40a529a - Some fixes for old compilers like tru64 v4 from Daniel Richard G.
Matt Johnston <matt@ucc.asn.au>
parents: 852
diff changeset
832
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
833 /* kex_algorithms */
741
eafdf8b363f5 Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents: 740
diff changeset
834 algo = buf_match_algo(ses.payload, sshkex, &kexguess2, &goodguess);
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
835 allgood &= goodguess;
740
3062da90dab8 Add kexguess2 behaviour
Matt Johnston <matt@ucc.asn.au>
parents: 739
diff changeset
836 if (algo == NULL || algo->val == KEXGUESS2_ALGO_ID) {
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
837 erralgo = "kex";
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
838 goto error;
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
839 }
740
3062da90dab8 Add kexguess2 behaviour
Matt Johnston <matt@ucc.asn.au>
parents: 739
diff changeset
840 TRACE(("kexguess2 %d", kexguess2))
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
841 TRACE(("kex algo %s", algo->name))
756
bf9dc2d9c2b1 more bits on ecc branch
Matt Johnston <matt@ucc.asn.au>
parents: 755
diff changeset
842 ses.newkeys->algo_kex = algo->data;
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
843
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
844 /* server_host_key_algorithms */
741
eafdf8b363f5 Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents: 740
diff changeset
845 algo = buf_match_algo(ses.payload, sshhostkey, &kexguess2, &goodguess);
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
846 allgood &= goodguess;
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
847 if (algo == NULL) {
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
848 erralgo = "hostkey";
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
849 goto error;
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
850 }
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
851 TRACE(("hostkey algo %s", algo->name))
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
852 ses.newkeys->algo_hostkey = algo->val;
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
853
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
854 /* encryption_algorithms_client_to_server */
741
eafdf8b363f5 Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents: 740
diff changeset
855 c2s_cipher_algo = buf_match_algo(ses.payload, sshciphers, NULL, NULL);
116
2010f4119c1a Check for non-matching algos properly
Matt Johnston <matt@ucc.asn.au>
parents: 84
diff changeset
856 if (c2s_cipher_algo == NULL) {
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
857 erralgo = "enc c->s";
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
858 goto error;
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
859 }
228
5e4110bb753a - Fixed twofish algorithm naming so it actually works.
Matt Johnston <matt@ucc.asn.au>
parents: 227
diff changeset
860 TRACE(("enc c2s is %s", c2s_cipher_algo->name))
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
861
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
862 /* encryption_algorithms_server_to_client */
741
eafdf8b363f5 Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents: 740
diff changeset
863 s2c_cipher_algo = buf_match_algo(ses.payload, sshciphers, NULL, NULL);
116
2010f4119c1a Check for non-matching algos properly
Matt Johnston <matt@ucc.asn.au>
parents: 84
diff changeset
864 if (s2c_cipher_algo == NULL) {
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
865 erralgo = "enc s->c";
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
866 goto error;
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
867 }
228
5e4110bb753a - Fixed twofish algorithm naming so it actually works.
Matt Johnston <matt@ucc.asn.au>
parents: 227
diff changeset
868 TRACE(("enc s2c is %s", s2c_cipher_algo->name))
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
869
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
870 /* mac_algorithms_client_to_server */
741
eafdf8b363f5 Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents: 740
diff changeset
871 c2s_hash_algo = buf_match_algo(ses.payload, sshhashes, NULL, NULL);
116
2010f4119c1a Check for non-matching algos properly
Matt Johnston <matt@ucc.asn.au>
parents: 84
diff changeset
872 if (c2s_hash_algo == NULL) {
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
873 erralgo = "mac c->s";
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
874 goto error;
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
875 }
228
5e4110bb753a - Fixed twofish algorithm naming so it actually works.
Matt Johnston <matt@ucc.asn.au>
parents: 227
diff changeset
876 TRACE(("hash c2s is %s", c2s_hash_algo->name))
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
877
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
878 /* mac_algorithms_server_to_client */
741
eafdf8b363f5 Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents: 740
diff changeset
879 s2c_hash_algo = buf_match_algo(ses.payload, sshhashes, NULL, NULL);
116
2010f4119c1a Check for non-matching algos properly
Matt Johnston <matt@ucc.asn.au>
parents: 84
diff changeset
880 if (s2c_hash_algo == NULL) {
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
881 erralgo = "mac s->c";
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
882 goto error;
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
883 }
228
5e4110bb753a - Fixed twofish algorithm naming so it actually works.
Matt Johnston <matt@ucc.asn.au>
parents: 227
diff changeset
884 TRACE(("hash s2c is %s", s2c_hash_algo->name))
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
885
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
886 /* compression_algorithms_client_to_server */
741
eafdf8b363f5 Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents: 740
diff changeset
887 c2s_comp_algo = buf_match_algo(ses.payload, ses.compress_algos, NULL, NULL);
116
2010f4119c1a Check for non-matching algos properly
Matt Johnston <matt@ucc.asn.au>
parents: 84
diff changeset
888 if (c2s_comp_algo == NULL) {
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
889 erralgo = "comp c->s";
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
890 goto error;
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
891 }
228
5e4110bb753a - Fixed twofish algorithm naming so it actually works.
Matt Johnston <matt@ucc.asn.au>
parents: 227
diff changeset
892 TRACE(("hash c2s is %s", c2s_comp_algo->name))
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
893
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
894 /* compression_algorithms_server_to_client */
741
eafdf8b363f5 Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents: 740
diff changeset
895 s2c_comp_algo = buf_match_algo(ses.payload, ses.compress_algos, NULL, NULL);
116
2010f4119c1a Check for non-matching algos properly
Matt Johnston <matt@ucc.asn.au>
parents: 84
diff changeset
896 if (s2c_comp_algo == NULL) {
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
897 erralgo = "comp s->c";
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
898 goto error;
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
899 }
228
5e4110bb753a - Fixed twofish algorithm naming so it actually works.
Matt Johnston <matt@ucc.asn.au>
parents: 227
diff changeset
900 TRACE(("hash s2c is %s", s2c_comp_algo->name))
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
901
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
902 /* languages_client_to_server */
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
903 buf_eatstring(ses.payload);
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
904
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
905 /* languages_server_to_client */
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
906 buf_eatstring(ses.payload);
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
907
739
d44325108d0e first_kex_packet_follows working, needs tidying
Matt Johnston <matt@ucc.asn.au>
parents: 712
diff changeset
908 /* their 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
909 if (buf_getbool(ses.payload)) {
739
d44325108d0e first_kex_packet_follows working, needs tidying
Matt Johnston <matt@ucc.asn.au>
parents: 712
diff changeset
910 TRACE(("them kex firstfollows. allgood %d", allgood))
d44325108d0e first_kex_packet_follows working, needs tidying
Matt Johnston <matt@ucc.asn.au>
parents: 712
diff changeset
911 ses.kexstate.them_firstfollows = 1;
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
912 /* 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
913 if (!allgood) {
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
914 ses.ignorenext = 1;
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
915 }
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
916 }
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
917
36
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
918 /* Handle the asymmetry */
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
919 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
920 ses.newkeys->recv.algo_crypt =
36
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
921 (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
922 ses.newkeys->trans.algo_crypt =
36
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
923 (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
924 ses.newkeys->recv.crypt_mode =
502
43bbe17d6ba0 - Add Counter Mode support
Matt Johnston <matt@ucc.asn.au>
parents: 501
diff changeset
925 (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
926 ses.newkeys->trans.crypt_mode =
502
43bbe17d6ba0 - Add Counter Mode support
Matt Johnston <matt@ucc.asn.au>
parents: 501
diff changeset
927 (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
928 ses.newkeys->recv.algo_mac =
36
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
929 (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
930 ses.newkeys->trans.algo_mac =
36
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
931 (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
932 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
933 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
934 } else {
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
935 /* SERVER */
534
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents: 502
diff changeset
936 ses.newkeys->recv.algo_crypt =
36
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
937 (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
938 ses.newkeys->trans.algo_crypt =
36
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
939 (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
940 ses.newkeys->recv.crypt_mode =
502
43bbe17d6ba0 - Add Counter Mode support
Matt Johnston <matt@ucc.asn.au>
parents: 501
diff changeset
941 (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
942 ses.newkeys->trans.crypt_mode =
502
43bbe17d6ba0 - Add Counter Mode support
Matt Johnston <matt@ucc.asn.au>
parents: 501
diff changeset
943 (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
944 ses.newkeys->recv.algo_mac =
36
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
945 (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
946 ses.newkeys->trans.algo_mac =
36
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
947 (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
948 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
949 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
950 }
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
951
1558
2f64cb3d3007 - #if not #ifdef for DROPBEAR_FUZZ
Matt Johnston <matt@ucc.asn.au>
parents: 1511
diff changeset
952 #if DROPBEAR_FUZZ
1357
08f4fa4dc6a0 closer to working
Matt Johnston <matt@ucc.asn.au>
parents: 1355
diff changeset
953 if (fuzz.fuzzing) {
08f4fa4dc6a0 closer to working
Matt Johnston <matt@ucc.asn.au>
parents: 1355
diff changeset
954 fuzz_kex_fakealgos();
08f4fa4dc6a0 closer to working
Matt Johnston <matt@ucc.asn.au>
parents: 1355
diff changeset
955 }
1347
b28624698130 copy over some fuzzing code from AFL branch
Matt Johnston <matt@ucc.asn.au>
parents: 1276
diff changeset
956 #endif
b28624698130 copy over some fuzzing code from AFL branch
Matt Johnston <matt@ucc.asn.au>
parents: 1276
diff changeset
957
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
958 /* reserved for future extensions */
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
959 buf_getint(ses.payload);
739
d44325108d0e first_kex_packet_follows working, needs tidying
Matt Johnston <matt@ucc.asn.au>
parents: 712
diff changeset
960
d44325108d0e first_kex_packet_follows working, needs tidying
Matt Johnston <matt@ucc.asn.au>
parents: 712
diff changeset
961 if (ses.send_kex_first_guess && allgood) {
d44325108d0e first_kex_packet_follows working, needs tidying
Matt Johnston <matt@ucc.asn.au>
parents: 712
diff changeset
962 TRACE(("our_first_follows_matches 1"))
d44325108d0e first_kex_packet_follows working, needs tidying
Matt Johnston <matt@ucc.asn.au>
parents: 712
diff changeset
963 ses.kexstate.our_first_follows_matches = 1;
d44325108d0e first_kex_packet_follows working, needs tidying
Matt Johnston <matt@ucc.asn.au>
parents: 712
diff changeset
964 }
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
965 return;
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
966
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
967 error:
594
a98a2138364a Improve capitalisation for all logged strings
Matt Johnston <matt@ucc.asn.au>
parents: 575
diff changeset
968 dropbear_exit("No matching algo %s", erralgo);
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
969 }