annotate common-kex.c @ 1697:789466c5956b

set up early logging name
author Matt Johnston <matt@ucc.asn.au>
date Thu, 28 May 2020 22:02:33 +0800
parents 1051e4eea25a
children 56f636f84bf5
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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 "curve25519.h"
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40 #include "crypto_desc.h"
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41
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42 static void kexinitialise(void);
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43 static void gen_new_keys(void);
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44 #ifndef DISABLE_ZLIB
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45 static void gen_new_zstream_recv(void);
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46 static void gen_new_zstream_trans(void);
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47 #endif
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48 static void read_kex_algos(void);
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49 /* helper function for gen_new_keys */
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50 static void hashkeys(unsigned char *out, unsigned int outlen,
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51 const hash_state * hs, const unsigned char X);
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54 /* Send our list of algorithms we can use */
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55 void send_msg_kexinit() {
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56
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57 CHECKCLEARTOWRITE();
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58 buf_putbyte(ses.writepayload, SSH_MSG_KEXINIT);
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59
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60 /* cookie */
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61 genrandom(buf_getwriteptr(ses.writepayload, 16), 16);
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62 buf_incrwritepos(ses.writepayload, 16);
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63
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64 /* kex algos */
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65 buf_put_algolist(ses.writepayload, sshkex);
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67 /* server_host_key_algorithms */
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68 buf_put_algolist(ses.writepayload, sigalgs);
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70 /* encryption_algorithms_client_to_server */
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71 buf_put_algolist(ses.writepayload, sshciphers);
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73 /* encryption_algorithms_server_to_client */
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74 buf_put_algolist(ses.writepayload, sshciphers);
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76 /* mac_algorithms_client_to_server */
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77 buf_put_algolist(ses.writepayload, sshhashes);
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78
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79 /* mac_algorithms_server_to_client */
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80 buf_put_algolist(ses.writepayload, sshhashes);
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83 /* compression_algorithms_client_to_server */
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84 buf_put_algolist(ses.writepayload, ses.compress_algos);
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86 /* compression_algorithms_server_to_client */
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87 buf_put_algolist(ses.writepayload, ses.compress_algos);
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89 /* languages_client_to_server */
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90 buf_putstring(ses.writepayload, "", 0);
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91
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92 /* languages_server_to_client */
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93 buf_putstring(ses.writepayload, "", 0);
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94
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95 /* first_kex_packet_follows */
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96 buf_putbyte(ses.writepayload, (ses.send_kex_first_guess != NULL));
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98 /* reserved unit32 */
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99 buf_putint(ses.writepayload, 0);
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100
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101 /* set up transmitted kex packet buffer for hashing.
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102 * This is freed after the end of the kex */
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103 ses.transkexinit = buf_newcopy(ses.writepayload);
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104
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105 encrypt_packet();
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106 ses.dataallowed = 0; /* don't send other packets during kex */
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107
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108 ses.kexstate.sentkexinit = 1;
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109
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110 ses.newkeys = (struct key_context*)m_malloc(sizeof(struct key_context));
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111
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112 if (ses.send_kex_first_guess) {
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113 ses.newkeys->algo_kex = first_usable_algo(sshkex)->data;
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114 ses.newkeys->algo_signature = first_usable_algo(sigalgs)->val;
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115 ses.newkeys->algo_hostkey = signkey_type_from_signature(ses.newkeys->algo_signature);
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116 ses.send_kex_first_guess();
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117 }
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118
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119 TRACE(("DATAALLOWED=0"))
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120 TRACE(("-> KEXINIT"))
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121
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122 }
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123
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124 static void switch_keys() {
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125 TRACE2(("enter switch_keys"))
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126 if (!(ses.kexstate.sentkexinit && ses.kexstate.recvkexinit)) {
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127 dropbear_exit("Unexpected newkeys message");
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128 }
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129
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130 if (!ses.keys) {
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131 ses.keys = m_malloc(sizeof(*ses.newkeys));
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132 }
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133 if (ses.kexstate.recvnewkeys && ses.newkeys->recv.valid) {
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134 TRACE(("switch_keys recv"))
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135 #ifndef DISABLE_ZLIB
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136 gen_new_zstream_recv();
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137 #endif
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138 ses.keys->recv = ses.newkeys->recv;
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139 m_burn(&ses.newkeys->recv, sizeof(ses.newkeys->recv));
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140 ses.newkeys->recv.valid = 0;
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141 }
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142 if (ses.kexstate.sentnewkeys && ses.newkeys->trans.valid) {
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143 TRACE(("switch_keys trans"))
781
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144 #ifndef DISABLE_ZLIB
771
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diff changeset
145 gen_new_zstream_trans();
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146 #endif
753
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147 ses.keys->trans = ses.newkeys->trans;
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148 m_burn(&ses.newkeys->trans, sizeof(ses.newkeys->trans));
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149 ses.newkeys->trans.valid = 0;
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150 }
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151 if (ses.kexstate.sentnewkeys && ses.kexstate.recvnewkeys)
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152 {
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153 TRACE(("switch_keys done"))
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154 ses.keys->algo_kex = ses.newkeys->algo_kex;
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155 ses.keys->algo_hostkey = ses.newkeys->algo_hostkey;
1674
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156 ses.keys->algo_signature = ses.newkeys->algo_signature;
753
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157 ses.keys->allow_compress = 0;
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158 m_free(ses.newkeys);
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159 ses.newkeys = NULL;
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160 kexinitialise();
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161 }
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162 TRACE2(("leave switch_keys"))
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163 }
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164
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165 /* Bring new keys into use after a key exchange, and let the client know*/
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166 void send_msg_newkeys() {
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167
165
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168 TRACE(("enter send_msg_newkeys"))
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169
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170 /* generate the kexinit request */
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171 CHECKCLEARTOWRITE();
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172 buf_putbyte(ses.writepayload, SSH_MSG_NEWKEYS);
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173 encrypt_packet();
753
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174
4
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175
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176 /* set up our state */
753
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177 ses.kexstate.sentnewkeys = 1;
1681
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178 if (ses.kexstate.donefirstkex) {
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179 ses.kexstate.donesecondkex = 1;
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180 }
753
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181 ses.kexstate.donefirstkex = 1;
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182 ses.dataallowed = 1; /* we can send other packets again now */
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183 gen_new_keys();
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184 switch_keys();
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185
165
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186 TRACE(("leave send_msg_newkeys"))
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187 }
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188
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189 /* Bring the new keys into use after a key exchange */
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190 void recv_msg_newkeys() {
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191
165
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192 TRACE(("enter recv_msg_newkeys"))
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193
753
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194 ses.kexstate.recvnewkeys = 1;
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195 switch_keys();
4
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196
165
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197 TRACE(("leave recv_msg_newkeys"))
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198 }
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199
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200
33
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diff changeset
201 /* Set up the kex for the first time */
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diff changeset
202 void kexfirstinitialise() {
996
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203 #ifdef DISABLE_ZLIB
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204 ses.compress_algos = ssh_nocompress;
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205 #else
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206 switch (opts.compress_mode)
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207 {
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208 case DROPBEAR_COMPRESS_DELAYED:
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209 ses.compress_algos = ssh_delaycompress;
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210 break;
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211
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212 case DROPBEAR_COMPRESS_ON:
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213 ses.compress_algos = ssh_compress;
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214 break;
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215
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216 case DROPBEAR_COMPRESS_OFF:
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217 ses.compress_algos = ssh_nocompress;
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218 break;
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219 }
575
f9b5dc0cba61 - Disable compression for non-final multihops
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diff changeset
220 #endif
33
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diff changeset
221 kexinitialise();
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222 }
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223
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224 /* Reset the kex state, ready for a new negotiation */
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diff changeset
225 static void kexinitialise() {
4
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226
165
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diff changeset
227 TRACE(("kexinitialise()"))
4
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228
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229 /* sent/recv'd MSG_KEXINIT */
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230 ses.kexstate.sentkexinit = 0;
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231 ses.kexstate.recvkexinit = 0;
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232
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233 /* sent/recv'd MSG_NEWKEYS */
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234 ses.kexstate.recvnewkeys = 0;
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235 ses.kexstate.sentnewkeys = 0;
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236
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237 /* first_packet_follows */
739
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diff changeset
238 ses.kexstate.them_firstfollows = 0;
4
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239
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240 ses.kexstate.datatrans = 0;
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241 ses.kexstate.datarecv = 0;
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242
739
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diff changeset
243 ses.kexstate.our_first_follows_matches = 0;
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diff changeset
244
928
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diff changeset
245 ses.kexstate.lastkextime = monotonic_now();
4
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246
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247 }
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248
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249 /* Helper function for gen_new_keys, creates a hash. It makes a copy of the
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250 * already initialised hash_state hs, which should already have processed
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251 * the dh_K and hash, since these are common. X is the letter 'A', 'B' etc.
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252 * out must have at least min(SHA1_HASH_SIZE, outlen) bytes allocated.
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diff changeset
253 *
409
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parents: 257
diff changeset
254 * See Section 7.2 of rfc4253 (ssh transport) for details */
762
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diff changeset
255 static void hashkeys(unsigned char *out, unsigned int outlen,
4
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256 const hash_state * hs, const unsigned char X) {
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diff changeset
257
793
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diff changeset
258 const struct ltc_hash_descriptor *hash_desc = ses.newkeys->algo_kex->hash_desc;
4
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259 hash_state hs2;
762
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diff changeset
260 unsigned int offset;
855
04ede40a529a - Some fixes for old compilers like tru64 v4 from Daniel Richard G.
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parents: 852
diff changeset
261 unsigned char tmpout[MAX_HASH_SIZE];
4
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262
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263 memcpy(&hs2, hs, sizeof(hash_state));
793
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diff changeset
264 hash_desc->process(&hs2, &X, 1);
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diff changeset
265 hash_desc->process(&hs2, ses.session_id->data, ses.session_id->len);
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diff changeset
266 hash_desc->done(&hs2, tmpout);
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diff changeset
267 memcpy(out, tmpout, MIN(hash_desc->hashsize, outlen));
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diff changeset
268 for (offset = hash_desc->hashsize;
679
03073a27abb3 - Add hmac-sha2-256 and hmac-sha2-512. Needs debugging, seems to be
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parents: 648
diff changeset
269 offset < outlen;
793
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diff changeset
270 offset += hash_desc->hashsize)
679
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diff changeset
271 {
4
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272 /* need to extend */
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273 memcpy(&hs2, hs, sizeof(hash_state));
793
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diff changeset
274 hash_desc->process(&hs2, out, offset);
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diff changeset
275 hash_desc->done(&hs2, tmpout);
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diff changeset
276 memcpy(&out[offset], tmpout, MIN(outlen - offset, hash_desc->hashsize));
4
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277 }
987
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diff changeset
278 m_burn(&hs2, sizeof(hash_state));
4
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279 }
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280
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diff changeset
281 /* Generate the actual encryption/integrity keys, using the results of the
603
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parents: 595
diff changeset
282 * key exchange, as specified in section 7.2 of the transport rfc 4253.
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parents: 595
diff changeset
283 * This occurs after the DH key-exchange.
4
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diff changeset
284 *
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diff changeset
285 * ses.newkeys is the new set of keys which are generated, these are only
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diff changeset
286 * taken into use after both sides have sent a newkeys message */
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parents:
diff changeset
287
753
d63ef1e211ea Take transmit and receive keys into use separately
Matt Johnston <matt@ucc.asn.au>
parents: 746
diff changeset
288 static void gen_new_keys() {
4
fe6bca95afa7 Makefile.in contains updated files required
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parents:
diff changeset
289
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
290 unsigned char C2S_IV[MAX_IV_LEN];
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
291 unsigned char C2S_key[MAX_KEY_LEN];
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
292 unsigned char S2C_IV[MAX_IV_LEN];
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
293 unsigned char S2C_key[MAX_KEY_LEN];
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
294 /* unsigned char key[MAX_KEY_LEN]; */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
295 unsigned char *trans_IV, *trans_key, *recv_IV, *recv_key;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
296
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
297 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
298 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
299 char mactransletter, macrecvletter; /* Client or server specific */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
300
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
301 TRACE(("enter gen_new_keys"))
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
302 /* 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
303
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->init(&hs);
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 766
diff changeset
305 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
306 mp_clear(ses.dh_K);
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
307 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
308 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
309 buf_burn(ses.hash);
ac2158e3e403 ecc kind of works, needs fixing/testing
Matt Johnston <matt@ucc.asn.au>
parents: 759
diff changeset
310 buf_free(ses.hash);
ac2158e3e403 ecc kind of works, needs fixing/testing
Matt Johnston <matt@ucc.asn.au>
parents: 759
diff changeset
311 ses.hash = NULL;
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
312
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
313 if (IS_DROPBEAR_CLIENT) {
1250
2bb4c662d1c2 more hard tab
Francois Perrad <francois.perrad@gadz.org>
parents: 1175
diff changeset
314 trans_IV = C2S_IV;
2bb4c662d1c2 more hard tab
Francois Perrad <francois.perrad@gadz.org>
parents: 1175
diff changeset
315 recv_IV = S2C_IV;
2bb4c662d1c2 more hard tab
Francois Perrad <francois.perrad@gadz.org>
parents: 1175
diff changeset
316 trans_key = C2S_key;
2bb4c662d1c2 more hard tab
Francois Perrad <francois.perrad@gadz.org>
parents: 1175
diff changeset
317 recv_key = S2C_key;
4
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
318 mactransletter = 'E';
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
319 macrecvletter = 'F';
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
320 } else {
1250
2bb4c662d1c2 more hard tab
Francois Perrad <francois.perrad@gadz.org>
parents: 1175
diff changeset
321 trans_IV = S2C_IV;
2bb4c662d1c2 more hard tab
Francois Perrad <francois.perrad@gadz.org>
parents: 1175
diff changeset
322 recv_IV = C2S_IV;
2bb4c662d1c2 more hard tab
Francois Perrad <francois.perrad@gadz.org>
parents: 1175
diff changeset
323 trans_key = S2C_key;
2bb4c662d1c2 more hard tab
Francois Perrad <francois.perrad@gadz.org>
parents: 1175
diff changeset
324 recv_key = C2S_key;
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
325 mactransletter = 'F';
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
326 macrecvletter = 'E';
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
327 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
328
762
a78a38e402d1 - Fix various hardcoded uses of SHA1
Matt Johnston <matt@ucc.asn.au>
parents: 761
diff changeset
329 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
330 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
331 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
332 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
333
681
a4b7627b3157 Update insecure-nocrypto to current head
Matt Johnston <matt@ucc.asn.au>
parents: 679 512
diff changeset
334 if (ses.newkeys->recv.algo_crypt->cipherdesc != NULL) {
1672
3a97f14c0235 Add Chacha20-Poly1305, AES128-GCM and AES256-GCM support (#93)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents: 1659
diff changeset
335 int recv_cipher = -1;
3a97f14c0235 Add Chacha20-Poly1305, AES128-GCM and AES256-GCM support (#93)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents: 1659
diff changeset
336 if (ses.newkeys->recv.algo_crypt->cipherdesc->name != NULL) {
3a97f14c0235 Add Chacha20-Poly1305, AES128-GCM and AES256-GCM support (#93)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents: 1659
diff changeset
337 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
338 if (recv_cipher < 0)
681
a4b7627b3157 Update insecure-nocrypto to current head
Matt Johnston <matt@ucc.asn.au>
parents: 679 512
diff changeset
339 dropbear_exit("Crypto error");
1672
3a97f14c0235 Add Chacha20-Poly1305, AES128-GCM and AES256-GCM support (#93)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents: 1659
diff changeset
340 }
681
a4b7627b3157 Update insecure-nocrypto to current head
Matt Johnston <matt@ucc.asn.au>
parents: 679 512
diff changeset
341 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
342 recv_IV, recv_key,
681
a4b7627b3157 Update insecure-nocrypto to current head
Matt Johnston <matt@ucc.asn.au>
parents: 679 512
diff changeset
343 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
344 &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
345 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
346 }
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
347 }
502
43bbe17d6ba0 - Add Counter Mode support
Matt Johnston <matt@ucc.asn.au>
parents: 501
diff changeset
348
681
a4b7627b3157 Update insecure-nocrypto to current head
Matt Johnston <matt@ucc.asn.au>
parents: 679 512
diff changeset
349 if (ses.newkeys->trans.algo_crypt->cipherdesc != NULL) {
1672
3a97f14c0235 Add Chacha20-Poly1305, AES128-GCM and AES256-GCM support (#93)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents: 1659
diff changeset
350 int trans_cipher = -1;
3a97f14c0235 Add Chacha20-Poly1305, AES128-GCM and AES256-GCM support (#93)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents: 1659
diff changeset
351 if (ses.newkeys->trans.algo_crypt->cipherdesc->name != NULL) {
3a97f14c0235 Add Chacha20-Poly1305, AES128-GCM and AES256-GCM support (#93)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents: 1659
diff changeset
352 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
353 if (trans_cipher < 0)
681
a4b7627b3157 Update insecure-nocrypto to current head
Matt Johnston <matt@ucc.asn.au>
parents: 679 512
diff changeset
354 dropbear_exit("Crypto error");
1672
3a97f14c0235 Add Chacha20-Poly1305, AES128-GCM and AES256-GCM support (#93)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents: 1659
diff changeset
355 }
681
a4b7627b3157 Update insecure-nocrypto to current head
Matt Johnston <matt@ucc.asn.au>
parents: 679 512
diff changeset
356 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
357 trans_IV, trans_key,
681
a4b7627b3157 Update insecure-nocrypto to current head
Matt Johnston <matt@ucc.asn.au>
parents: 679 512
diff changeset
358 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
359 &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
360 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
361 }
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
362 }
512
0129fd8ccc71 Update nocrypto branch to current head
Matt Johnston <matt@ucc.asn.au>
parents: 511
diff changeset
363
793
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 766
diff changeset
364 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
365 hashkeys(ses.newkeys->trans.mackey,
a4b7627b3157 Update insecure-nocrypto to current head
Matt Johnston <matt@ucc.asn.au>
parents: 679 512
diff changeset
366 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
367 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
368 }
712
bf0ac0512ef7 Fix "-m none" case and ugly typo
Matt Johnston <matt@ucc.asn.au>
parents: 684
diff changeset
369
793
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 766
diff changeset
370 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
371 hashkeys(ses.newkeys->recv.mackey,
a4b7627b3157 Update insecure-nocrypto to current head
Matt Johnston <matt@ucc.asn.au>
parents: 679 512
diff changeset
372 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
373 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
374 }
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
375
753
d63ef1e211ea Take transmit and receive keys into use separately
Matt Johnston <matt@ucc.asn.au>
parents: 746
diff changeset
376 /* Ready to switch over */
d63ef1e211ea Take transmit and receive keys into use separately
Matt Johnston <matt@ucc.asn.au>
parents: 746
diff changeset
377 ses.newkeys->trans.valid = 1;
d63ef1e211ea Take transmit and receive keys into use separately
Matt Johnston <matt@ucc.asn.au>
parents: 746
diff changeset
378 ses.newkeys->recv.valid = 1;
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
379
648
4222a1039b06 Clear a few buffers when possible
Matt Johnston <matt@ucc.asn.au>
parents: 603
diff changeset
380 m_burn(C2S_IV, sizeof(C2S_IV));
4222a1039b06 Clear a few buffers when possible
Matt Johnston <matt@ucc.asn.au>
parents: 603
diff changeset
381 m_burn(C2S_key, sizeof(C2S_key));
4222a1039b06 Clear a few buffers when possible
Matt Johnston <matt@ucc.asn.au>
parents: 603
diff changeset
382 m_burn(S2C_IV, sizeof(S2C_IV));
4222a1039b06 Clear a few buffers when possible
Matt Johnston <matt@ucc.asn.au>
parents: 603
diff changeset
383 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
384 m_burn(&hs, sizeof(hash_state));
648
4222a1039b06 Clear a few buffers when possible
Matt Johnston <matt@ucc.asn.au>
parents: 603
diff changeset
385
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
386 TRACE(("leave gen_new_keys"))
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
387 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
388
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
389 #ifndef DISABLE_ZLIB
501
d58c478bd399 Add support for [email protected] delayed compression.
Matt Johnston <matt@ucc.asn.au>
parents: 454
diff changeset
390
d58c478bd399 Add support for [email protected] delayed compression.
Matt Johnston <matt@ucc.asn.au>
parents: 454
diff changeset
391 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
392 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
393 || (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
394 && 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
395 }
d58c478bd399 Add support for [email protected] delayed compression.
Matt Johnston <matt@ucc.asn.au>
parents: 454
diff changeset
396
d58c478bd399 Add support for [email protected] delayed compression.
Matt Johnston <matt@ucc.asn.au>
parents: 454
diff changeset
397 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
398 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
399 || (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
400 && 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
401 }
d58c478bd399 Add support for [email protected] delayed compression.
Matt Johnston <matt@ucc.asn.au>
parents: 454
diff changeset
402
1365
9aa6cd66b51d zlib can use m_malloc/m_free too
Matt Johnston <matt@ucc.asn.au>
parents: 1358
diff changeset
403 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
404 return m_calloc(items, size);
9aa6cd66b51d zlib can use m_malloc/m_free too
Matt Johnston <matt@ucc.asn.au>
parents: 1358
diff changeset
405 }
9aa6cd66b51d zlib can use m_malloc/m_free too
Matt Johnston <matt@ucc.asn.au>
parents: 1358
diff changeset
406
9aa6cd66b51d zlib can use m_malloc/m_free too
Matt Johnston <matt@ucc.asn.au>
parents: 1358
diff changeset
407 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
408 m_free(ptr);
9aa6cd66b51d zlib can use m_malloc/m_free too
Matt Johnston <matt@ucc.asn.au>
parents: 1358
diff changeset
409 }
9aa6cd66b51d zlib can use m_malloc/m_free too
Matt Johnston <matt@ucc.asn.au>
parents: 1358
diff changeset
410
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
411 /* 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
412 * called from gen_new_keys() */
771
a389a2a7aa96 Fix zlib for split newkeys
Matt Johnston <matt@ucc.asn.au>
parents: 753
diff changeset
413 static void gen_new_zstream_recv() {
4
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 /* 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
416 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
417 || 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
418 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
419 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
420 ses.newkeys->recv.zstream->zfree = dropbear_zfree;
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
421
534
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents: 502
diff changeset
422 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
423 dropbear_exit("zlib error");
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
424 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
425 } else {
534
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents: 502
diff changeset
426 ses.newkeys->recv.zstream = NULL;
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
427 }
771
a389a2a7aa96 Fix zlib for split newkeys
Matt Johnston <matt@ucc.asn.au>
parents: 753
diff changeset
428 /* clean up old keys */
a389a2a7aa96 Fix zlib for split newkeys
Matt Johnston <matt@ucc.asn.au>
parents: 753
diff changeset
429 if (ses.keys->recv.zstream != NULL) {
a389a2a7aa96 Fix zlib for split newkeys
Matt Johnston <matt@ucc.asn.au>
parents: 753
diff changeset
430 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
431 /* 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
432 dropbear_exit("Crypto error");
a389a2a7aa96 Fix zlib for split newkeys
Matt Johnston <matt@ucc.asn.au>
parents: 753
diff changeset
433 }
a389a2a7aa96 Fix zlib for split newkeys
Matt Johnston <matt@ucc.asn.au>
parents: 753
diff changeset
434 m_free(ses.keys->recv.zstream);
a389a2a7aa96 Fix zlib for split newkeys
Matt Johnston <matt@ucc.asn.au>
parents: 753
diff changeset
435 }
a389a2a7aa96 Fix zlib for split newkeys
Matt Johnston <matt@ucc.asn.au>
parents: 753
diff changeset
436 }
a389a2a7aa96 Fix zlib for split newkeys
Matt Johnston <matt@ucc.asn.au>
parents: 753
diff changeset
437
a389a2a7aa96 Fix zlib for split newkeys
Matt Johnston <matt@ucc.asn.au>
parents: 753
diff changeset
438 static void gen_new_zstream_trans() {
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
439
534
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents: 502
diff changeset
440 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
441 || 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
442 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
443 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
444 ses.newkeys->trans.zstream->zfree = dropbear_zfree;
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
445
555
daf52f813328 - Add option to change zlib windowBits/memLevel
Matt Johnston <matt@ucc.asn.au>
parents: 534
diff changeset
446 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
447 Z_DEFLATED, DROPBEAR_ZLIB_WINDOW_BITS,
daf52f813328 - Add option to change zlib windowBits/memLevel
Matt Johnston <matt@ucc.asn.au>
parents: 534
diff changeset
448 DROPBEAR_ZLIB_MEM_LEVEL, Z_DEFAULT_STRATEGY)
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
449 != Z_OK) {
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
450 dropbear_exit("zlib error");
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
451 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
452 } else {
534
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents: 502
diff changeset
453 ses.newkeys->trans.zstream = NULL;
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
454 }
501
d58c478bd399 Add support for [email protected] delayed compression.
Matt Johnston <matt@ucc.asn.au>
parents: 454
diff changeset
455
534
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents: 502
diff changeset
456 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
457 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
458 /* 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
459 dropbear_exit("Crypto error");
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
460 }
534
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents: 502
diff changeset
461 m_free(ses.keys->trans.zstream);
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
462 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
463 }
501
d58c478bd399 Add support for [email protected] delayed compression.
Matt Johnston <matt@ucc.asn.au>
parents: 454
diff changeset
464 #endif /* DISABLE_ZLIB */
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
465
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
466
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
467 /* 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
468 * 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
469 * 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
470 * 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
471 * 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
472 * initiate the diffie-hellman key exchange */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
473 void recv_msg_kexinit() {
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
474
257
63601217f5ab * options.h, common-kex.c: fix support of 4096 byte host keys
Matt Johnston <matt@ucc.asn.au>
parents: 228
diff changeset
475 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
476 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
477 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
478
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
479 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
480 TRACE(("enter recv_msg_kexinit"))
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
481
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
482 if (!ses.kexstate.sentkexinit) {
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
483 /* we need to send a kex packet */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
484 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
485 TRACE(("continue recv_msg_kexinit: sent kexinit"))
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
486 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
487
257
63601217f5ab * options.h, common-kex.c: fix support of 4096 byte host keys
Matt Johnston <matt@ucc.asn.au>
parents: 228
diff changeset
488 /* 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
489 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
490 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
491
63601217f5ab * options.h, common-kex.c: fix support of 4096 byte host keys
Matt Johnston <matt@ucc.asn.au>
parents: 228
diff changeset
492 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
493 + 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
494 + 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
495
63601217f5ab * options.h, common-kex.c: fix support of 4096 byte host keys
Matt Johnston <matt@ucc.asn.au>
parents: 228
diff changeset
496 ses.kexhashbuf = buf_new(kexhashbuf_len);
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
497
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
498 if (IS_DROPBEAR_CLIENT) {
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
499
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
500 /* read the peer's choice of algos */
33
f789045062e6 Progressing client support
Matt Johnston <matt@ucc.asn.au>
parents: 26
diff changeset
501 read_kex_algos();
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
502
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
503 /* 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
504 buf_putstring(ses.kexhashbuf, LOCAL_IDENT, local_ident_len);
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
505 /* 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
506 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
507
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
508 /* 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
509 buf_putstring(ses.kexhashbuf,
1122
aaf576b27a10 Merge pull request #13 from gazoo74/fix-warnings
Matt Johnston <matt@ucc.asn.au>
parents: 1108
diff changeset
510 (const char*)ses.transkexinit->data, ses.transkexinit->len);
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
511 /* 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
512 buf_setpos(ses.payload, ses.payload_beginning);
2bb4c662d1c2 more hard tab
Francois Perrad <francois.perrad@gadz.org>
parents: 1175
diff changeset
513 buf_putstring(ses.kexhashbuf,
2bb4c662d1c2 more hard tab
Francois Perrad <francois.perrad@gadz.org>
parents: 1175
diff changeset
514 (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
515 ses.payload->len-ses.payload->pos);
886
cbc73a5aefb0 requirenext doesn't need two values
Matt Johnston <matt@ucc.asn.au>
parents: 885
diff changeset
516 ses.requirenext = SSH_MSG_KEXDH_REPLY;
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
517 } else {
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
518 /* SERVER */
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
519
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
520 /* read the peer's choice of algos */
33
f789045062e6 Progressing client support
Matt Johnston <matt@ucc.asn.au>
parents: 26
diff changeset
521 read_kex_algos();
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
522 /* 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
523 buf_putstring(ses.kexhashbuf, ses.remoteident, remote_ident_len);
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
524 /* 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
525 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
526
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
527 /* 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
528 buf_setpos(ses.payload, ses.payload_beginning);
2bb4c662d1c2 more hard tab
Francois Perrad <francois.perrad@gadz.org>
parents: 1175
diff changeset
529 buf_putstring(ses.kexhashbuf,
2bb4c662d1c2 more hard tab
Francois Perrad <francois.perrad@gadz.org>
parents: 1175
diff changeset
530 (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
531 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
532
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
533 /* 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
534 buf_putstring(ses.kexhashbuf,
1122
aaf576b27a10 Merge pull request #13 from gazoo74/fix-warnings
Matt Johnston <matt@ucc.asn.au>
parents: 1108
diff changeset
535 (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
536
886
cbc73a5aefb0 requirenext doesn't need two values
Matt Johnston <matt@ucc.asn.au>
parents: 885
diff changeset
537 ses.requirenext = SSH_MSG_KEXDH_INIT;
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
538 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
539
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
540 buf_free(ses.transkexinit);
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
541 ses.transkexinit = NULL;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
542 /* 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
543
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
544 ses.kexstate.recvkexinit = 1;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
545
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
546 TRACE(("leave recv_msg_kexinit"))
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
547 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
548
595
2895626d864f Add diffie-hellman-group14-sha1 KEX method
Matt Johnston <matt@ucc.asn.au>
parents: 594
diff changeset
549 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
550 {
756
bf9dc2d9c2b1 more bits on ecc branch
Matt Johnston <matt@ucc.asn.au>
parents: 755
diff changeset
551 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
552 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
553 }
2895626d864f Add diffie-hellman-group14-sha1 KEX method
Matt Johnston <matt@ucc.asn.au>
parents: 594
diff changeset
554
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
555 /* 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
556 * 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
557 /* 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
558 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
559 struct kex_dh_param *param = NULL;
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
560
84
29a5c7c62350 default initialisers for mp_ints
Matt Johnston <matt@ucc.asn.au>
parents: 79
diff changeset
561 DEF_MP_INT(dh_p);
29a5c7c62350 default initialisers for mp_ints
Matt Johnston <matt@ucc.asn.au>
parents: 79
diff changeset
562 DEF_MP_INT(dh_q);
29a5c7c62350 default initialisers for mp_ints
Matt Johnston <matt@ucc.asn.au>
parents: 79
diff changeset
563 DEF_MP_INT(dh_g);
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
564
739
d44325108d0e first_kex_packet_follows working, needs tidying
Matt Johnston <matt@ucc.asn.au>
parents: 712
diff changeset
565 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
566
855
04ede40a529a - Some fixes for old compilers like tru64 v4 from Daniel Richard G.
Matt Johnston <matt@ucc.asn.au>
parents: 852
diff changeset
567 param = m_malloc(sizeof(*param));
852
7540c0822374 Various cleanups and fixes for warnings
Matt Johnston <matt@ucc.asn.au>
parents: 848
diff changeset
568 m_mp_init_multi(&param->pub, &param->priv, &dh_g, &dh_p, &dh_q, NULL);
26
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Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
569
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
570 /* read the prime and generator*/
595
2895626d864f Add diffie-hellman-group14-sha1 KEX method
Matt Johnston <matt@ucc.asn.au>
parents: 594
diff changeset
571 load_dh_p(&dh_p);
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
572
1692
1051e4eea25a Update LibTomMath to 1.2.0 (#84)
Steffen Jaeckel <s@jaeckel.eu>
parents: 1683
diff changeset
573 mp_set_ul(&dh_g, DH_G_VAL);
26
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 /* calculate q = (p-1)/2 */
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
576 /* 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
577 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
578 dropbear_exit("Diffie-Hellman error");
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
579 }
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_div_2(&param->priv, &dh_q) != 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
188
c9483550701b - refactored random mp_int generation and byte->mp_int code
Matt Johnston <matt@ucc.asn.au>
parents: 179
diff changeset
584 /* 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
585 gen_random_mpint(&dh_q, &param->priv);
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
586
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
587 /* 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
588 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
589 dropbear_exit("Diffie-Hellman error");
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
590 }
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
591 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
592 return param;
b07eb3dc23ec refactor kexdh code a bit, start working on ecdh etc
Matt Johnston <matt@ucc.asn.au>
parents: 712
diff changeset
593 }
b07eb3dc23ec refactor kexdh code a bit, start working on ecdh etc
Matt Johnston <matt@ucc.asn.au>
parents: 712
diff changeset
594
b07eb3dc23ec refactor kexdh code a bit, start working on ecdh etc
Matt Johnston <matt@ucc.asn.au>
parents: 712
diff changeset
595 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
596 {
b07eb3dc23ec refactor kexdh code a bit, start working on ecdh etc
Matt Johnston <matt@ucc.asn.au>
parents: 712
diff changeset
597 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
598 m_free(param);
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
599 }
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
600
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
601 /* 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
602 * of dh_e/dh_f etc. Hence these arguments:
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
603 * 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
604 * 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
605 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
606 sign_key *hostkey) {
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
607
1013
a1e79ffa5862 Tighten validation of DH values. Odds of x==0 being generated are
Matt Johnston <matt@ucc.asn.au>
parents: 996
diff changeset
608 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
609 DEF_MP_INT(dh_p_min1);
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
610 mp_int *dh_e = NULL, *dh_f = NULL;
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
611
1013
a1e79ffa5862 Tighten validation of DH values. Odds of x==0 being generated are
Matt Johnston <matt@ucc.asn.au>
parents: 996
diff changeset
612 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
613 load_dh_p(&dh_p);
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
614
1013
a1e79ffa5862 Tighten validation of DH values. Odds of x==0 being generated are
Matt Johnston <matt@ucc.asn.au>
parents: 996
diff changeset
615 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
616 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
617 }
a1e79ffa5862 Tighten validation of DH values. Odds of x==0 being generated are
Matt Johnston <matt@ucc.asn.au>
parents: 996
diff changeset
618
a1e79ffa5862 Tighten validation of DH values. Odds of x==0 being generated are
Matt Johnston <matt@ucc.asn.au>
parents: 996
diff changeset
619 /* 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
620 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
621 || mp_cmp_d(dh_pub_them, 1) != MP_GT) {
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
622 dropbear_exit("Diffie-Hellman error");
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
623 }
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
624
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
625 /* 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
626 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
627 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
628 dropbear_exit("Diffie-Hellman error");
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
629 }
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
630
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
631 /* 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
632 mp_clear_multi(&dh_p, &dh_p_min1, NULL);
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
633
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
634 /* 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
635 * not vice-versaing for client/server */
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
636 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
637 dh_e = &param->pub;
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
638 dh_f = dh_pub_them;
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
639 } else {
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
640 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
641 dh_f = &param->pub;
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
642 }
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
643
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
644 /* 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
645 /* K_S, the host key */
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
646 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
647 /* e, exchange value sent by the client */
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
648 buf_putmpint(ses.kexhashbuf, dh_e);
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
649 /* f, exchange value sent by the server */
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
650 buf_putmpint(ses.kexhashbuf, dh_f);
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
651 /* K, the shared secret */
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
652 buf_putmpint(ses.kexhashbuf, ses.dh_K);
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
653
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
654 /* 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
655 finish_kexhashbuf();
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
656 }
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
657
1295
750ec4ec4cbe Convert #ifdef to #if, other build changes
Matt Johnston <matt@ucc.asn.au>
parents: 1276
diff changeset
658 #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
659 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
660 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
661 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
662 &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
663 dropbear_exit("ECC error");
756
bf9dc2d9c2b1 more bits on ecc branch
Matt Johnston <matt@ucc.asn.au>
parents: 755
diff changeset
664 }
bf9dc2d9c2b1 more bits on ecc branch
Matt Johnston <matt@ucc.asn.au>
parents: 755
diff changeset
665 return param;
bf9dc2d9c2b1 more bits on ecc branch
Matt Johnston <matt@ucc.asn.au>
parents: 755
diff changeset
666 }
bf9dc2d9c2b1 more bits on ecc branch
Matt Johnston <matt@ucc.asn.au>
parents: 755
diff changeset
667
bf9dc2d9c2b1 more bits on ecc branch
Matt Johnston <matt@ucc.asn.au>
parents: 755
diff changeset
668 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
669 ecc_free(&param->key);
bf9dc2d9c2b1 more bits on ecc branch
Matt Johnston <matt@ucc.asn.au>
parents: 755
diff changeset
670 m_free(param);
bf9dc2d9c2b1 more bits on ecc branch
Matt Johnston <matt@ucc.asn.au>
parents: 755
diff changeset
671
755
b07eb3dc23ec refactor kexdh code a bit, start working on ecdh etc
Matt Johnston <matt@ucc.asn.au>
parents: 712
diff changeset
672 }
b07eb3dc23ec refactor kexdh code a bit, start working on ecdh etc
Matt Johnston <matt@ucc.asn.au>
parents: 712
diff changeset
673 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
674 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
675 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
676 /* public keys from client and server */
756
bf9dc2d9c2b1 more bits on ecc branch
Matt Johnston <matt@ucc.asn.au>
parents: 755
diff changeset
677 ecc_key *Q_C, *Q_S, *Q_them;
bf9dc2d9c2b1 more bits on ecc branch
Matt Johnston <matt@ucc.asn.au>
parents: 755
diff changeset
678
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
679 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
680 if (Q_them == NULL) {
a9e074b78cd5 check ecc key return, fix null pointer crash
Matt Johnston <matt@ucc.asn.au>
parents: 1124
diff changeset
681 dropbear_exit("ECC error");
a9e074b78cd5 check ecc key return, fix null pointer crash
Matt Johnston <matt@ucc.asn.au>
parents: 1124
diff changeset
682 }
757
230666086711 ecc key import function
Matt Johnston <matt@ucc.asn.au>
parents: 756
diff changeset
683
761
ac2158e3e403 ecc kind of works, needs fixing/testing
Matt Johnston <matt@ucc.asn.au>
parents: 759
diff changeset
684 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
685
848
6c69e7df3621 curve25519
Matt Johnston <matt@ucc.asn.au>
parents: 805
diff changeset
686 /* Create the remainder of the hash buffer, to generate the exchange hash
6c69e7df3621 curve25519
Matt Johnston <matt@ucc.asn.au>
parents: 805
diff changeset
687 See RFC5656 section 4 page 7 */
756
bf9dc2d9c2b1 more bits on ecc branch
Matt Johnston <matt@ucc.asn.au>
parents: 755
diff changeset
688 if (IS_DROPBEAR_CLIENT) {
761
ac2158e3e403 ecc kind of works, needs fixing/testing
Matt Johnston <matt@ucc.asn.au>
parents: 759
diff changeset
689 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
690 Q_S = Q_them;
756
bf9dc2d9c2b1 more bits on ecc branch
Matt Johnston <matt@ucc.asn.au>
parents: 755
diff changeset
691 } 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
692 Q_C = Q_them;
761
ac2158e3e403 ecc kind of works, needs fixing/testing
Matt Johnston <matt@ucc.asn.au>
parents: 759
diff changeset
693 Q_S = &param->key;
756
bf9dc2d9c2b1 more bits on ecc branch
Matt Johnston <matt@ucc.asn.au>
parents: 755
diff changeset
694 }
bf9dc2d9c2b1 more bits on ecc branch
Matt Johnston <matt@ucc.asn.au>
parents: 755
diff changeset
695
bf9dc2d9c2b1 more bits on ecc branch
Matt Johnston <matt@ucc.asn.au>
parents: 755
diff changeset
696 /* K_S, the host key */
bf9dc2d9c2b1 more bits on ecc branch
Matt Johnston <matt@ucc.asn.au>
parents: 755
diff changeset
697 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
698 /* 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
699 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
700 /* 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
701 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
702 /* K, the shared secret */
bf9dc2d9c2b1 more bits on ecc branch
Matt Johnston <matt@ucc.asn.au>
parents: 755
diff changeset
703 buf_putmpint(ses.kexhashbuf, ses.dh_K);
bf9dc2d9c2b1 more bits on ecc branch
Matt Johnston <matt@ucc.asn.au>
parents: 755
diff changeset
704
1607
0bdbb9ecc403 avoid leak of ecdh public key
Matt Johnston <matt@ucc.asn.au>
parents: 1558
diff changeset
705 ecc_free(Q_them);
0bdbb9ecc403 avoid leak of ecdh public key
Matt Johnston <matt@ucc.asn.au>
parents: 1558
diff changeset
706 m_free(Q_them);
0bdbb9ecc403 avoid leak of ecdh public key
Matt Johnston <matt@ucc.asn.au>
parents: 1558
diff changeset
707
756
bf9dc2d9c2b1 more bits on ecc branch
Matt Johnston <matt@ucc.asn.au>
parents: 755
diff changeset
708 /* 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
709 finish_kexhashbuf();
ac2158e3e403 ecc kind of works, needs fixing/testing
Matt Johnston <matt@ucc.asn.au>
parents: 759
diff changeset
710 }
848
6c69e7df3621 curve25519
Matt Johnston <matt@ucc.asn.au>
parents: 805
diff changeset
711 #endif /* DROPBEAR_ECDH */
6c69e7df3621 curve25519
Matt Johnston <matt@ucc.asn.au>
parents: 805
diff changeset
712
1295
750ec4ec4cbe Convert #ifdef to #if, other build changes
Matt Johnston <matt@ucc.asn.au>
parents: 1276
diff changeset
713 #if DROPBEAR_CURVE25519
1659
d32bcb5c557d Add Ed25519 support (#91)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents: 1607
diff changeset
714 struct kex_curve25519_param *gen_kexcurve25519_param() {
848
6c69e7df3621 curve25519
Matt Johnston <matt@ucc.asn.au>
parents: 805
diff changeset
715 /* Per http://cr.yp.to/ecdh.html */
6c69e7df3621 curve25519
Matt Johnston <matt@ucc.asn.au>
parents: 805
diff changeset
716 struct kex_curve25519_param *param = m_malloc(sizeof(*param));
6c69e7df3621 curve25519
Matt Johnston <matt@ucc.asn.au>
parents: 805
diff changeset
717 const unsigned char basepoint[32] = {9};
6c69e7df3621 curve25519
Matt Johnston <matt@ucc.asn.au>
parents: 805
diff changeset
718
6c69e7df3621 curve25519
Matt Johnston <matt@ucc.asn.au>
parents: 805
diff changeset
719 genrandom(param->priv, CURVE25519_LEN);
1659
d32bcb5c557d Add Ed25519 support (#91)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents: 1607
diff changeset
720 dropbear_curve25519_scalarmult(param->pub, param->priv, basepoint);
848
6c69e7df3621 curve25519
Matt Johnston <matt@ucc.asn.au>
parents: 805
diff changeset
721
6c69e7df3621 curve25519
Matt Johnston <matt@ucc.asn.au>
parents: 805
diff changeset
722 return param;
6c69e7df3621 curve25519
Matt Johnston <matt@ucc.asn.au>
parents: 805
diff changeset
723 }
6c69e7df3621 curve25519
Matt Johnston <matt@ucc.asn.au>
parents: 805
diff changeset
724
1659
d32bcb5c557d Add Ed25519 support (#91)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents: 1607
diff changeset
725 void free_kexcurve25519_param(struct kex_curve25519_param *param) {
848
6c69e7df3621 curve25519
Matt Johnston <matt@ucc.asn.au>
parents: 805
diff changeset
726 m_burn(param->priv, CURVE25519_LEN);
6c69e7df3621 curve25519
Matt Johnston <matt@ucc.asn.au>
parents: 805
diff changeset
727 m_free(param);
6c69e7df3621 curve25519
Matt Johnston <matt@ucc.asn.au>
parents: 805
diff changeset
728 }
6c69e7df3621 curve25519
Matt Johnston <matt@ucc.asn.au>
parents: 805
diff changeset
729
1459
06d52bcb8094 Pointer parameter could be declared as pointing to const
Francois Perrad <francois.perrad@gadz.org>
parents: 1402
diff changeset
730 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
731 sign_key *hostkey) {
852
7540c0822374 Various cleanups and fixes for warnings
Matt Johnston <matt@ucc.asn.au>
parents: 848
diff changeset
732 unsigned char out[CURVE25519_LEN];
848
6c69e7df3621 curve25519
Matt Johnston <matt@ucc.asn.au>
parents: 805
diff changeset
733 const unsigned char* Q_C = NULL;
6c69e7df3621 curve25519
Matt Johnston <matt@ucc.asn.au>
parents: 805
diff changeset
734 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
735 char zeroes[CURVE25519_LEN] = {0};
848
6c69e7df3621 curve25519
Matt Johnston <matt@ucc.asn.au>
parents: 805
diff changeset
736
6c69e7df3621 curve25519
Matt Johnston <matt@ucc.asn.au>
parents: 805
diff changeset
737 if (buf_pub_them->len != CURVE25519_LEN)
6c69e7df3621 curve25519
Matt Johnston <matt@ucc.asn.au>
parents: 805
diff changeset
738 {
6c69e7df3621 curve25519
Matt Johnston <matt@ucc.asn.au>
parents: 805
diff changeset
739 dropbear_exit("Bad curve25519");
6c69e7df3621 curve25519
Matt Johnston <matt@ucc.asn.au>
parents: 805
diff changeset
740 }
6c69e7df3621 curve25519
Matt Johnston <matt@ucc.asn.au>
parents: 805
diff changeset
741
1659
d32bcb5c557d Add Ed25519 support (#91)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents: 1607
diff changeset
742 dropbear_curve25519_scalarmult(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
743
1b8afc698e39 check for zero K value from curve25519
Matt Johnston <matt@ucc.asn.au>
parents: 1128
diff changeset
744 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
745 dropbear_exit("Bad curve25519");
1b8afc698e39 check for zero K value from curve25519
Matt Johnston <matt@ucc.asn.au>
parents: 1128
diff changeset
746 }
1b8afc698e39 check for zero K value from curve25519
Matt Johnston <matt@ucc.asn.au>
parents: 1128
diff changeset
747
852
7540c0822374 Various cleanups and fixes for warnings
Matt Johnston <matt@ucc.asn.au>
parents: 848
diff changeset
748 m_mp_alloc_init_multi(&ses.dh_K, NULL);
848
6c69e7df3621 curve25519
Matt Johnston <matt@ucc.asn.au>
parents: 805
diff changeset
749 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
750 m_burn(out, sizeof(out));
848
6c69e7df3621 curve25519
Matt Johnston <matt@ucc.asn.au>
parents: 805
diff changeset
751
6c69e7df3621 curve25519
Matt Johnston <matt@ucc.asn.au>
parents: 805
diff changeset
752 /* Create the remainder of the hash buffer, to generate the exchange hash.
6c69e7df3621 curve25519
Matt Johnston <matt@ucc.asn.au>
parents: 805
diff changeset
753 See RFC5656 section 4 page 7 */
6c69e7df3621 curve25519
Matt Johnston <matt@ucc.asn.au>
parents: 805
diff changeset
754 if (IS_DROPBEAR_CLIENT) {
6c69e7df3621 curve25519
Matt Johnston <matt@ucc.asn.au>
parents: 805
diff changeset
755 Q_C = param->pub;
6c69e7df3621 curve25519
Matt Johnston <matt@ucc.asn.au>
parents: 805
diff changeset
756 Q_S = buf_pub_them->data;
6c69e7df3621 curve25519
Matt Johnston <matt@ucc.asn.au>
parents: 805
diff changeset
757 } else {
6c69e7df3621 curve25519
Matt Johnston <matt@ucc.asn.au>
parents: 805
diff changeset
758 Q_S = param->pub;
6c69e7df3621 curve25519
Matt Johnston <matt@ucc.asn.au>
parents: 805
diff changeset
759 Q_C = buf_pub_them->data;
6c69e7df3621 curve25519
Matt Johnston <matt@ucc.asn.au>
parents: 805
diff changeset
760 }
6c69e7df3621 curve25519
Matt Johnston <matt@ucc.asn.au>
parents: 805
diff changeset
761
6c69e7df3621 curve25519
Matt Johnston <matt@ucc.asn.au>
parents: 805
diff changeset
762 /* K_S, the host key */
6c69e7df3621 curve25519
Matt Johnston <matt@ucc.asn.au>
parents: 805
diff changeset
763 buf_put_pub_key(ses.kexhashbuf, hostkey, ses.newkeys->algo_hostkey);
6c69e7df3621 curve25519
Matt Johnston <matt@ucc.asn.au>
parents: 805
diff changeset
764 /* 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
765 buf_putstring(ses.kexhashbuf, (const char*)Q_C, CURVE25519_LEN);
848
6c69e7df3621 curve25519
Matt Johnston <matt@ucc.asn.au>
parents: 805
diff changeset
766 /* 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
767 buf_putstring(ses.kexhashbuf, (const char*)Q_S, CURVE25519_LEN);
848
6c69e7df3621 curve25519
Matt Johnston <matt@ucc.asn.au>
parents: 805
diff changeset
768 /* K, the shared secret */
6c69e7df3621 curve25519
Matt Johnston <matt@ucc.asn.au>
parents: 805
diff changeset
769 buf_putmpint(ses.kexhashbuf, ses.dh_K);
6c69e7df3621 curve25519
Matt Johnston <matt@ucc.asn.au>
parents: 805
diff changeset
770
6c69e7df3621 curve25519
Matt Johnston <matt@ucc.asn.au>
parents: 805
diff changeset
771 /* calculate the hash H to sign */
6c69e7df3621 curve25519
Matt Johnston <matt@ucc.asn.au>
parents: 805
diff changeset
772 finish_kexhashbuf();
6c69e7df3621 curve25519
Matt Johnston <matt@ucc.asn.au>
parents: 805
diff changeset
773 }
6c69e7df3621 curve25519
Matt Johnston <matt@ucc.asn.au>
parents: 805
diff changeset
774 #endif /* DROPBEAR_CURVE25519 */
6c69e7df3621 curve25519
Matt Johnston <matt@ucc.asn.au>
parents: 805
diff changeset
775
6c69e7df3621 curve25519
Matt Johnston <matt@ucc.asn.au>
parents: 805
diff changeset
776
1456
a90fdd2d2ed8 add fuzzer-preauth_nomaths
Matt Johnston <matt@ucc.asn.au>
parents: 1411
diff changeset
777 void finish_kexhashbuf(void) {
761
ac2158e3e403 ecc kind of works, needs fixing/testing
Matt Johnston <matt@ucc.asn.au>
parents: 759
diff changeset
778 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
779 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
780
793
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 766
diff changeset
781 hash_desc->init(&hs);
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
782 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
783 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
784 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
785 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
786 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
787 buf_setlen(ses.hash, hash_desc->hashsize);
35
0ad5fb979f42 set the isserver flag (oops)
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
788
1402
553c6bb80265 fix DEBUG_* condition
Francois Perrad <francois.perrad@gadz.org>
parents: 1295
diff changeset
789 #if defined(DEBUG_KEXHASH) && DEBUG_TRACE
907
4a74c58e11fc Make some debug info conditional
Matt Johnston <matt@ucc.asn.au>
parents: 886
diff changeset
790 if (!debug_trace) {
4a74c58e11fc Make some debug info conditional
Matt Johnston <matt@ucc.asn.au>
parents: 886
diff changeset
791 printhex("kexhashbuf", ses.kexhashbuf->data, ses.kexhashbuf->len);
4a74c58e11fc Make some debug info conditional
Matt Johnston <matt@ucc.asn.au>
parents: 886
diff changeset
792 printhex("kexhash", ses.hash->data, ses.hash->len);
4a74c58e11fc Make some debug info conditional
Matt Johnston <matt@ucc.asn.au>
parents: 886
diff changeset
793 }
883
ff597bf2cfb0 DROPBEAR_CLI_AUTH_IMMEDIATE fixed, now enabled by default
Matt Johnston <matt@ucc.asn.au>
parents: 858
diff changeset
794 #endif
ff597bf2cfb0 DROPBEAR_CLI_AUTH_IMMEDIATE fixed, now enabled by default
Matt Johnston <matt@ucc.asn.au>
parents: 858
diff changeset
795
35
0ad5fb979f42 set the isserver flag (oops)
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
796 buf_burn(ses.kexhashbuf);
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
797 buf_free(ses.kexhashbuf);
987
ed85797bbc85 clear hash state memory after use
Matt Johnston <matt@ucc.asn.au>
parents: 928
diff changeset
798 m_burn(&hs, sizeof(hash_state));
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
799 ses.kexhashbuf = NULL;
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 /* first time around, we set the session_id to H */
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
802 if (ses.session_id == NULL) {
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
803 /* 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
804 ses.session_id = buf_newcopy(ses.hash);
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
805 }
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
806 }
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
807
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
808 /* 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
809 * algos for the client or server. */
33
f789045062e6 Progressing client support
Matt Johnston <matt@ucc.asn.au>
parents: 26
diff changeset
810 static void read_kex_algos() {
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
811
36
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
812 /* for asymmetry */
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
813 algo_type * c2s_hash_algo = NULL;
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
814 algo_type * s2c_hash_algo = NULL;
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
815 algo_type * c2s_cipher_algo = NULL;
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
816 algo_type * s2c_cipher_algo = NULL;
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
817 algo_type * c2s_comp_algo = NULL;
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
818 algo_type * s2c_comp_algo = NULL;
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
819 /* the generic one */
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
820 algo_type * algo = NULL;
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
821
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
822 /* which algo couldn't match */
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
823 char * erralgo = NULL;
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
824
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
825 int goodguess = 0;
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
826 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
827 true after */
1676
d5cdc60db08e ext-info handling for server-sig-algs
Matt Johnston <matt@ucc.asn.au>
parents: 1674
diff changeset
828 int kexguess2 = 0;
740
3062da90dab8 Add kexguess2 behaviour
Matt Johnston <matt@ucc.asn.au>
parents: 739
diff changeset
829
855
04ede40a529a - Some fixes for old compilers like tru64 v4 from Daniel Richard G.
Matt Johnston <matt@ucc.asn.au>
parents: 852
diff changeset
830 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
831
04ede40a529a - Some fixes for old compilers like tru64 v4 from Daniel Richard G.
Matt Johnston <matt@ucc.asn.au>
parents: 852
diff changeset
832 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
833
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
834 /* kex_algorithms */
1676
d5cdc60db08e ext-info handling for server-sig-algs
Matt Johnston <matt@ucc.asn.au>
parents: 1674
diff changeset
835 #if DROPBEAR_KEXGUESS2
d5cdc60db08e ext-info handling for server-sig-algs
Matt Johnston <matt@ucc.asn.au>
parents: 1674
diff changeset
836 if (buf_has_algo(ses.payload, KEXGUESS2_ALGO_NAME) == DROPBEAR_SUCCESS) {
d5cdc60db08e ext-info handling for server-sig-algs
Matt Johnston <matt@ucc.asn.au>
parents: 1674
diff changeset
837 kexguess2 = 1;
d5cdc60db08e ext-info handling for server-sig-algs
Matt Johnston <matt@ucc.asn.au>
parents: 1674
diff changeset
838 }
d5cdc60db08e ext-info handling for server-sig-algs
Matt Johnston <matt@ucc.asn.au>
parents: 1674
diff changeset
839 #endif
d5cdc60db08e ext-info handling for server-sig-algs
Matt Johnston <matt@ucc.asn.au>
parents: 1674
diff changeset
840
1681
435cfb9ec96e send and handle SSH_MSG_EXT_INFO only at the correct point
Matt Johnston <matt@ucc.asn.au>
parents: 1678
diff changeset
841 #if DROPBEAR_EXT_INFO
1676
d5cdc60db08e ext-info handling for server-sig-algs
Matt Johnston <matt@ucc.asn.au>
parents: 1674
diff changeset
842 /* Determine if SSH_MSG_EXT_INFO messages should be sent.
1678
4b4cfc92c5b7 Make server send SSH_MSG_EXT_INFO
Matt Johnston <matt@ucc.asn.au>
parents: 1676
diff changeset
843 Should be done for the first key exchange. Only required on server side
4b4cfc92c5b7 Make server send SSH_MSG_EXT_INFO
Matt Johnston <matt@ucc.asn.au>
parents: 1676
diff changeset
844 for server-sig-algs */
4b4cfc92c5b7 Make server send SSH_MSG_EXT_INFO
Matt Johnston <matt@ucc.asn.au>
parents: 1676
diff changeset
845 if (IS_DROPBEAR_SERVER) {
4b4cfc92c5b7 Make server send SSH_MSG_EXT_INFO
Matt Johnston <matt@ucc.asn.au>
parents: 1676
diff changeset
846 if (!ses.kexstate.donefirstkex) {
1676
d5cdc60db08e ext-info handling for server-sig-algs
Matt Johnston <matt@ucc.asn.au>
parents: 1674
diff changeset
847 if (buf_has_algo(ses.payload, SSH_EXT_INFO_C) == DROPBEAR_SUCCESS) {
d5cdc60db08e ext-info handling for server-sig-algs
Matt Johnston <matt@ucc.asn.au>
parents: 1674
diff changeset
848 ses.allow_ext_info = 1;
d5cdc60db08e ext-info handling for server-sig-algs
Matt Johnston <matt@ucc.asn.au>
parents: 1674
diff changeset
849 }
d5cdc60db08e ext-info handling for server-sig-algs
Matt Johnston <matt@ucc.asn.au>
parents: 1674
diff changeset
850 }
d5cdc60db08e ext-info handling for server-sig-algs
Matt Johnston <matt@ucc.asn.au>
parents: 1674
diff changeset
851 }
1681
435cfb9ec96e send and handle SSH_MSG_EXT_INFO only at the correct point
Matt Johnston <matt@ucc.asn.au>
parents: 1678
diff changeset
852 #endif
1676
d5cdc60db08e ext-info handling for server-sig-algs
Matt Johnston <matt@ucc.asn.au>
parents: 1674
diff changeset
853
d5cdc60db08e ext-info handling for server-sig-algs
Matt Johnston <matt@ucc.asn.au>
parents: 1674
diff changeset
854 algo = buf_match_algo(ses.payload, sshkex, kexguess2, &goodguess);
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
855 allgood &= goodguess;
1676
d5cdc60db08e ext-info handling for server-sig-algs
Matt Johnston <matt@ucc.asn.au>
parents: 1674
diff changeset
856 if (algo == NULL || algo->data == NULL) {
d5cdc60db08e ext-info handling for server-sig-algs
Matt Johnston <matt@ucc.asn.au>
parents: 1674
diff changeset
857 /* kexguess2, ext-info-c, ext-info-s should not match negotiation */
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
858 erralgo = "kex";
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
859 goto error;
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
860 }
740
3062da90dab8 Add kexguess2 behaviour
Matt Johnston <matt@ucc.asn.au>
parents: 739
diff changeset
861 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
862 TRACE(("kex algo %s", algo->name))
756
bf9dc2d9c2b1 more bits on ecc branch
Matt Johnston <matt@ucc.asn.au>
parents: 755
diff changeset
863 ses.newkeys->algo_kex = algo->data;
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
864
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
865 /* server_host_key_algorithms */
1678
4b4cfc92c5b7 Make server send SSH_MSG_EXT_INFO
Matt Johnston <matt@ucc.asn.au>
parents: 1676
diff changeset
866 algo = buf_match_algo(ses.payload, sigalgs, kexguess2, &goodguess);
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
867 allgood &= goodguess;
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
868 if (algo == NULL) {
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
869 erralgo = "hostkey";
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
870 goto error;
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
871 }
1674
ba6fc7afe1c5 use sigtype where appropriate
Matt Johnston <matt@ucc.asn.au>
parents: 1659
diff changeset
872 TRACE(("signature algo %s", algo->name))
ba6fc7afe1c5 use sigtype where appropriate
Matt Johnston <matt@ucc.asn.au>
parents: 1659
diff changeset
873 ses.newkeys->algo_signature = algo->val;
ba6fc7afe1c5 use sigtype where appropriate
Matt Johnston <matt@ucc.asn.au>
parents: 1659
diff changeset
874 ses.newkeys->algo_hostkey = signkey_type_from_signature(ses.newkeys->algo_signature);
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
875
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
876 /* encryption_algorithms_client_to_server */
1678
4b4cfc92c5b7 Make server send SSH_MSG_EXT_INFO
Matt Johnston <matt@ucc.asn.au>
parents: 1676
diff changeset
877 c2s_cipher_algo = buf_match_algo(ses.payload, sshciphers, 0, NULL);
116
2010f4119c1a Check for non-matching algos properly
Matt Johnston <matt@ucc.asn.au>
parents: 84
diff changeset
878 if (c2s_cipher_algo == NULL) {
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
879 erralgo = "enc c->s";
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
880 goto error;
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
881 }
228
5e4110bb753a - Fixed twofish algorithm naming so it actually works.
Matt Johnston <matt@ucc.asn.au>
parents: 227
diff changeset
882 TRACE(("enc c2s is %s", c2s_cipher_algo->name))
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
883
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
884 /* encryption_algorithms_server_to_client */
1678
4b4cfc92c5b7 Make server send SSH_MSG_EXT_INFO
Matt Johnston <matt@ucc.asn.au>
parents: 1676
diff changeset
885 s2c_cipher_algo = buf_match_algo(ses.payload, sshciphers, 0, NULL);
116
2010f4119c1a Check for non-matching algos properly
Matt Johnston <matt@ucc.asn.au>
parents: 84
diff changeset
886 if (s2c_cipher_algo == NULL) {
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
887 erralgo = "enc s->c";
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
888 goto error;
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
889 }
228
5e4110bb753a - Fixed twofish algorithm naming so it actually works.
Matt Johnston <matt@ucc.asn.au>
parents: 227
diff changeset
890 TRACE(("enc s2c is %s", s2c_cipher_algo->name))
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
891
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
892 /* mac_algorithms_client_to_server */
1678
4b4cfc92c5b7 Make server send SSH_MSG_EXT_INFO
Matt Johnston <matt@ucc.asn.au>
parents: 1676
diff changeset
893 c2s_hash_algo = buf_match_algo(ses.payload, sshhashes, 0, NULL);
1672
3a97f14c0235 Add Chacha20-Poly1305, AES128-GCM and AES256-GCM support (#93)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents: 1659
diff changeset
894 #if DROPBEAR_AEAD_MODE
3a97f14c0235 Add Chacha20-Poly1305, AES128-GCM and AES256-GCM support (#93)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents: 1659
diff changeset
895 if (((struct dropbear_cipher_mode*)c2s_cipher_algo->mode)->aead_crypt != NULL) {
3a97f14c0235 Add Chacha20-Poly1305, AES128-GCM and AES256-GCM support (#93)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents: 1659
diff changeset
896 c2s_hash_algo = NULL;
3a97f14c0235 Add Chacha20-Poly1305, AES128-GCM and AES256-GCM support (#93)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents: 1659
diff changeset
897 } else
3a97f14c0235 Add Chacha20-Poly1305, AES128-GCM and AES256-GCM support (#93)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents: 1659
diff changeset
898 #endif
116
2010f4119c1a Check for non-matching algos properly
Matt Johnston <matt@ucc.asn.au>
parents: 84
diff changeset
899 if (c2s_hash_algo == NULL) {
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
900 erralgo = "mac c->s";
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
901 goto error;
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
902 }
1672
3a97f14c0235 Add Chacha20-Poly1305, AES128-GCM and AES256-GCM support (#93)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents: 1659
diff changeset
903 TRACE(("hash c2s is %s", c2s_hash_algo ? c2s_hash_algo->name : "<implicit>"))
26
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 /* mac_algorithms_server_to_client */
1678
4b4cfc92c5b7 Make server send SSH_MSG_EXT_INFO
Matt Johnston <matt@ucc.asn.au>
parents: 1676
diff changeset
906 s2c_hash_algo = buf_match_algo(ses.payload, sshhashes, 0, NULL);
1672
3a97f14c0235 Add Chacha20-Poly1305, AES128-GCM and AES256-GCM support (#93)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents: 1659
diff changeset
907 #if DROPBEAR_AEAD_MODE
3a97f14c0235 Add Chacha20-Poly1305, AES128-GCM and AES256-GCM support (#93)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents: 1659
diff changeset
908 if (((struct dropbear_cipher_mode*)s2c_cipher_algo->mode)->aead_crypt != NULL) {
3a97f14c0235 Add Chacha20-Poly1305, AES128-GCM and AES256-GCM support (#93)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents: 1659
diff changeset
909 s2c_hash_algo = NULL;
3a97f14c0235 Add Chacha20-Poly1305, AES128-GCM and AES256-GCM support (#93)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents: 1659
diff changeset
910 } else
3a97f14c0235 Add Chacha20-Poly1305, AES128-GCM and AES256-GCM support (#93)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents: 1659
diff changeset
911 #endif
116
2010f4119c1a Check for non-matching algos properly
Matt Johnston <matt@ucc.asn.au>
parents: 84
diff changeset
912 if (s2c_hash_algo == NULL) {
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
913 erralgo = "mac s->c";
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
914 goto error;
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
915 }
1672
3a97f14c0235 Add Chacha20-Poly1305, AES128-GCM and AES256-GCM support (#93)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents: 1659
diff changeset
916 TRACE(("hash s2c is %s", s2c_hash_algo ? s2c_hash_algo->name : "<implicit>"))
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
917
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
918 /* compression_algorithms_client_to_server */
1678
4b4cfc92c5b7 Make server send SSH_MSG_EXT_INFO
Matt Johnston <matt@ucc.asn.au>
parents: 1676
diff changeset
919 c2s_comp_algo = buf_match_algo(ses.payload, ses.compress_algos, 0, NULL);
116
2010f4119c1a Check for non-matching algos properly
Matt Johnston <matt@ucc.asn.au>
parents: 84
diff changeset
920 if (c2s_comp_algo == NULL) {
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
921 erralgo = "comp c->s";
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
922 goto error;
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
923 }
228
5e4110bb753a - Fixed twofish algorithm naming so it actually works.
Matt Johnston <matt@ucc.asn.au>
parents: 227
diff changeset
924 TRACE(("hash c2s is %s", c2s_comp_algo->name))
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
925
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
926 /* compression_algorithms_server_to_client */
1678
4b4cfc92c5b7 Make server send SSH_MSG_EXT_INFO
Matt Johnston <matt@ucc.asn.au>
parents: 1676
diff changeset
927 s2c_comp_algo = buf_match_algo(ses.payload, ses.compress_algos, 0, NULL);
116
2010f4119c1a Check for non-matching algos properly
Matt Johnston <matt@ucc.asn.au>
parents: 84
diff changeset
928 if (s2c_comp_algo == NULL) {
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
929 erralgo = "comp s->c";
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
930 goto error;
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
931 }
228
5e4110bb753a - Fixed twofish algorithm naming so it actually works.
Matt Johnston <matt@ucc.asn.au>
parents: 227
diff changeset
932 TRACE(("hash s2c is %s", s2c_comp_algo->name))
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
933
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
934 /* languages_client_to_server */
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
935 buf_eatstring(ses.payload);
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
936
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
937 /* languages_server_to_client */
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
938 buf_eatstring(ses.payload);
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
939
739
d44325108d0e first_kex_packet_follows working, needs tidying
Matt Johnston <matt@ucc.asn.au>
parents: 712
diff changeset
940 /* 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
941 if (buf_getbool(ses.payload)) {
739
d44325108d0e first_kex_packet_follows working, needs tidying
Matt Johnston <matt@ucc.asn.au>
parents: 712
diff changeset
942 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
943 ses.kexstate.them_firstfollows = 1;
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
944 /* 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
945 if (!allgood) {
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
946 ses.ignorenext = 1;
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
947 }
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
948 }
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
949
36
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
950 /* Handle the asymmetry */
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
951 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
952 ses.newkeys->recv.algo_crypt =
36
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
953 (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
954 ses.newkeys->trans.algo_crypt =
36
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
955 (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
956 ses.newkeys->recv.crypt_mode =
502
43bbe17d6ba0 - Add Counter Mode support
Matt Johnston <matt@ucc.asn.au>
parents: 501
diff changeset
957 (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
958 ses.newkeys->trans.crypt_mode =
502
43bbe17d6ba0 - Add Counter Mode support
Matt Johnston <matt@ucc.asn.au>
parents: 501
diff changeset
959 (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
960 ses.newkeys->recv.algo_mac =
1672
3a97f14c0235 Add Chacha20-Poly1305, AES128-GCM and AES256-GCM support (#93)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents: 1659
diff changeset
961 #if DROPBEAR_AEAD_MODE
3a97f14c0235 Add Chacha20-Poly1305, AES128-GCM and AES256-GCM support (#93)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents: 1659
diff changeset
962 s2c_hash_algo == NULL ? ses.newkeys->recv.crypt_mode->aead_mac :
3a97f14c0235 Add Chacha20-Poly1305, AES128-GCM and AES256-GCM support (#93)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents: 1659
diff changeset
963 #endif
36
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
964 (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
965 ses.newkeys->trans.algo_mac =
1672
3a97f14c0235 Add Chacha20-Poly1305, AES128-GCM and AES256-GCM support (#93)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents: 1659
diff changeset
966 #if DROPBEAR_AEAD_MODE
3a97f14c0235 Add Chacha20-Poly1305, AES128-GCM and AES256-GCM support (#93)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents: 1659
diff changeset
967 c2s_hash_algo == NULL ? ses.newkeys->trans.crypt_mode->aead_mac :
3a97f14c0235 Add Chacha20-Poly1305, AES128-GCM and AES256-GCM support (#93)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents: 1659
diff changeset
968 #endif
36
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
969 (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
970 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
971 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
972 } else {
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
973 /* SERVER */
534
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents: 502
diff changeset
974 ses.newkeys->recv.algo_crypt =
36
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
975 (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
976 ses.newkeys->trans.algo_crypt =
36
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
977 (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
978 ses.newkeys->recv.crypt_mode =
502
43bbe17d6ba0 - Add Counter Mode support
Matt Johnston <matt@ucc.asn.au>
parents: 501
diff changeset
979 (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
980 ses.newkeys->trans.crypt_mode =
502
43bbe17d6ba0 - Add Counter Mode support
Matt Johnston <matt@ucc.asn.au>
parents: 501
diff changeset
981 (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
982 ses.newkeys->recv.algo_mac =
1672
3a97f14c0235 Add Chacha20-Poly1305, AES128-GCM and AES256-GCM support (#93)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents: 1659
diff changeset
983 #if DROPBEAR_AEAD_MODE
3a97f14c0235 Add Chacha20-Poly1305, AES128-GCM and AES256-GCM support (#93)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents: 1659
diff changeset
984 c2s_hash_algo == NULL ? ses.newkeys->recv.crypt_mode->aead_mac :
3a97f14c0235 Add Chacha20-Poly1305, AES128-GCM and AES256-GCM support (#93)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents: 1659
diff changeset
985 #endif
36
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
986 (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
987 ses.newkeys->trans.algo_mac =
1672
3a97f14c0235 Add Chacha20-Poly1305, AES128-GCM and AES256-GCM support (#93)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents: 1659
diff changeset
988 #if DROPBEAR_AEAD_MODE
3a97f14c0235 Add Chacha20-Poly1305, AES128-GCM and AES256-GCM support (#93)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents: 1659
diff changeset
989 s2c_hash_algo == NULL ? ses.newkeys->trans.crypt_mode->aead_mac :
3a97f14c0235 Add Chacha20-Poly1305, AES128-GCM and AES256-GCM support (#93)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents: 1659
diff changeset
990 #endif
36
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
991 (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
992 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
993 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
994 }
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
995
1558
2f64cb3d3007 - #if not #ifdef for DROPBEAR_FUZZ
Matt Johnston <matt@ucc.asn.au>
parents: 1511
diff changeset
996 #if DROPBEAR_FUZZ
1357
08f4fa4dc6a0 closer to working
Matt Johnston <matt@ucc.asn.au>
parents: 1355
diff changeset
997 if (fuzz.fuzzing) {
08f4fa4dc6a0 closer to working
Matt Johnston <matt@ucc.asn.au>
parents: 1355
diff changeset
998 fuzz_kex_fakealgos();
08f4fa4dc6a0 closer to working
Matt Johnston <matt@ucc.asn.au>
parents: 1355
diff changeset
999 }
1347
b28624698130 copy over some fuzzing code from AFL branch
Matt Johnston <matt@ucc.asn.au>
parents: 1276
diff changeset
1000 #endif
b28624698130 copy over some fuzzing code from AFL branch
Matt Johnston <matt@ucc.asn.au>
parents: 1276
diff changeset
1001
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
1002 /* reserved for future extensions */
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
1003 buf_getint(ses.payload);
739
d44325108d0e first_kex_packet_follows working, needs tidying
Matt Johnston <matt@ucc.asn.au>
parents: 712
diff changeset
1004
d44325108d0e first_kex_packet_follows working, needs tidying
Matt Johnston <matt@ucc.asn.au>
parents: 712
diff changeset
1005 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
1006 TRACE(("our_first_follows_matches 1"))
d44325108d0e first_kex_packet_follows working, needs tidying
Matt Johnston <matt@ucc.asn.au>
parents: 712
diff changeset
1007 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
1008 }
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
1009 return;
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
1010
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
1011 error:
594
a98a2138364a Improve capitalisation for all logged strings
Matt Johnston <matt@ucc.asn.au>
parents: 575
diff changeset
1012 dropbear_exit("No matching algo %s", erralgo);
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
1013 }