annotate common-kex.c @ 688:650c41a4909a

Add a few more files in /proc for Linux
author Matt Johnston <matt@ucc.asn.au>
date Sat, 30 Jun 2012 22:12:28 +0800
parents 63f8d6c469cf
children c37857676924
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1 /*
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2 * Dropbear SSH
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3 *
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4 * Copyright (c) 2002-2004 Matt Johnston
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5 * Portions Copyright (c) 2004 by Mihnea Stoenescu
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6 * All rights reserved.
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7 *
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8 * Permission is hereby granted, free of charge, to any person obtaining a copy
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9 * of this software and associated documentation files (the "Software"), to deal
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10 * in the Software without restriction, including without limitation the rights
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11 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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12 * copies of the Software, and to permit persons to whom the Software is
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13 * furnished to do so, subject to the following conditions:
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14 *
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15 * The above copyright notice and this permission notice shall be included in
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16 * all copies or substantial portions of the Software.
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17 *
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18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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19 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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20 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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21 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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22 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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23 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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24 * SOFTWARE. */
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25
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26 #include "includes.h"
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27 #include "dbutil.h"
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28 #include "algo.h"
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29 #include "buffer.h"
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30 #include "session.h"
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31 #include "kex.h"
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32 #include "ssh.h"
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33 #include "packet.h"
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34 #include "bignum.h"
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35 #include "random.h"
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36 #include "runopts.h"
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38 /* diffie-hellman-group1-sha1 value for p */
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39 #define DH_P_1_LEN 128
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40 static const unsigned char dh_p_1[DH_P_1_LEN] = {
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41 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xC9, 0x0F, 0xDA, 0xA2,
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42 0x21, 0x68, 0xC2, 0x34, 0xC4, 0xC6, 0x62, 0x8B, 0x80, 0xDC, 0x1C, 0xD1,
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43 0x29, 0x02, 0x4E, 0x08, 0x8A, 0x67, 0xCC, 0x74, 0x02, 0x0B, 0xBE, 0xA6,
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44 0x3B, 0x13, 0x9B, 0x22, 0x51, 0x4A, 0x08, 0x79, 0x8E, 0x34, 0x04, 0xDD,
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45 0xEF, 0x95, 0x19, 0xB3, 0xCD, 0x3A, 0x43, 0x1B, 0x30, 0x2B, 0x0A, 0x6D,
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46 0xF2, 0x5F, 0x14, 0x37, 0x4F, 0xE1, 0x35, 0x6D, 0x6D, 0x51, 0xC2, 0x45,
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47 0xE4, 0x85, 0xB5, 0x76, 0x62, 0x5E, 0x7E, 0xC6, 0xF4, 0x4C, 0x42, 0xE9,
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48 0xA6, 0x37, 0xED, 0x6B, 0x0B, 0xFF, 0x5C, 0xB6, 0xF4, 0x06, 0xB7, 0xED,
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49 0xEE, 0x38, 0x6B, 0xFB, 0x5A, 0x89, 0x9F, 0xA5, 0xAE, 0x9F, 0x24, 0x11,
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50 0x7C, 0x4B, 0x1F, 0xE6, 0x49, 0x28, 0x66, 0x51, 0xEC, 0xE6, 0x53, 0x81,
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51 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF};
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53 /* diffie-hellman-group14-sha1 value for p */
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54 #define DH_P_14_LEN 256
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55 static const unsigned char dh_p_14[DH_P_14_LEN] = {
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56 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xC9, 0x0F, 0xDA, 0xA2,
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57 0x21, 0x68, 0xC2, 0x34, 0xC4, 0xC6, 0x62, 0x8B, 0x80, 0xDC, 0x1C, 0xD1,
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58 0x29, 0x02, 0x4E, 0x08, 0x8A, 0x67, 0xCC, 0x74, 0x02, 0x0B, 0xBE, 0xA6,
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59 0x3B, 0x13, 0x9B, 0x22, 0x51, 0x4A, 0x08, 0x79, 0x8E, 0x34, 0x04, 0xDD,
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60 0xEF, 0x95, 0x19, 0xB3, 0xCD, 0x3A, 0x43, 0x1B, 0x30, 0x2B, 0x0A, 0x6D,
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61 0xF2, 0x5F, 0x14, 0x37, 0x4F, 0xE1, 0x35, 0x6D, 0x6D, 0x51, 0xC2, 0x45,
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62 0xE4, 0x85, 0xB5, 0x76, 0x62, 0x5E, 0x7E, 0xC6, 0xF4, 0x4C, 0x42, 0xE9,
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63 0xA6, 0x37, 0xED, 0x6B, 0x0B, 0xFF, 0x5C, 0xB6, 0xF4, 0x06, 0xB7, 0xED,
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64 0xEE, 0x38, 0x6B, 0xFB, 0x5A, 0x89, 0x9F, 0xA5, 0xAE, 0x9F, 0x24, 0x11,
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65 0x7C, 0x4B, 0x1F, 0xE6, 0x49, 0x28, 0x66, 0x51, 0xEC, 0xE4, 0x5B, 0x3D,
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66 0xC2, 0x00, 0x7C, 0xB8, 0xA1, 0x63, 0xBF, 0x05, 0x98, 0xDA, 0x48, 0x36,
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67 0x1C, 0x55, 0xD3, 0x9A, 0x69, 0x16, 0x3F, 0xA8, 0xFD, 0x24, 0xCF, 0x5F,
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68 0x83, 0x65, 0x5D, 0x23, 0xDC, 0xA3, 0xAD, 0x96, 0x1C, 0x62, 0xF3, 0x56,
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69 0x20, 0x85, 0x52, 0xBB, 0x9E, 0xD5, 0x29, 0x07, 0x70, 0x96, 0x96, 0x6D,
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70 0x67, 0x0C, 0x35, 0x4E, 0x4A, 0xBC, 0x98, 0x04, 0xF1, 0x74, 0x6C, 0x08,
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71 0xCA, 0x18, 0x21, 0x7C, 0x32, 0x90, 0x5E, 0x46, 0x2E, 0x36, 0xCE, 0x3B,
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72 0xE3, 0x9E, 0x77, 0x2C, 0x18, 0x0E, 0x86, 0x03, 0x9B, 0x27, 0x83, 0xA2,
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73 0xEC, 0x07, 0xA2, 0x8F, 0xB5, 0xC5, 0x5D, 0xF0, 0x6F, 0x4C, 0x52, 0xC9,
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74 0xDE, 0x2B, 0xCB, 0xF6, 0x95, 0x58, 0x17, 0x18, 0x39, 0x95, 0x49, 0x7C,
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75 0xEA, 0x95, 0x6A, 0xE5, 0x15, 0xD2, 0x26, 0x18, 0x98, 0xFA, 0x05, 0x10,
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76 0x15, 0x72, 0x8E, 0x5A, 0x8A, 0xAC, 0xAA, 0x68, 0xFF, 0xFF, 0xFF, 0xFF,
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77 0xFF, 0xFF, 0xFF, 0xFF};
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78
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79 /* Same for group1 and group14 */
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80 static const int DH_G_VAL = 2;
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81
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82 static void kexinitialise();
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83 void gen_new_keys();
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84 #ifndef DISABLE_ZLIB
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85 static void gen_new_zstreams();
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86 #endif
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87 static void read_kex_algos();
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88 /* helper function for gen_new_keys */
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89 static void hashkeys(unsigned char *out, int outlen,
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90 const hash_state * hs, unsigned const char X);
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91
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92
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93 /* Send our list of algorithms we can use */
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94 void send_msg_kexinit() {
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95
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96 CHECKCLEARTOWRITE();
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97 buf_putbyte(ses.writepayload, SSH_MSG_KEXINIT);
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98
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99 /* cookie */
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100 genrandom(buf_getwriteptr(ses.writepayload, 16), 16);
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101 buf_incrwritepos(ses.writepayload, 16);
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102
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103 /* kex algos */
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104 buf_put_algolist(ses.writepayload, sshkex);
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105
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106 /* server_host_key_algorithms */
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107 buf_put_algolist(ses.writepayload, sshhostkey);
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108
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109 /* encryption_algorithms_client_to_server */
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110 buf_put_algolist(ses.writepayload, sshciphers);
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111
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112 /* encryption_algorithms_server_to_client */
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113 buf_put_algolist(ses.writepayload, sshciphers);
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114
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115 /* mac_algorithms_client_to_server */
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116 buf_put_algolist(ses.writepayload, sshhashes);
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117
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118 /* mac_algorithms_server_to_client */
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119 buf_put_algolist(ses.writepayload, sshhashes);
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120
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121
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122 /* compression_algorithms_client_to_server */
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123 buf_put_algolist(ses.writepayload, ses.compress_algos);
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124
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125 /* compression_algorithms_server_to_client */
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126 buf_put_algolist(ses.writepayload, ses.compress_algos);
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127
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128 /* languages_client_to_server */
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129 buf_putstring(ses.writepayload, "", 0);
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130
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131 /* languages_server_to_client */
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132 buf_putstring(ses.writepayload, "", 0);
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133
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134 /* first_kex_packet_follows - unimplemented for now */
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135 buf_putbyte(ses.writepayload, 0x00);
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136
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137 /* reserved unit32 */
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138 buf_putint(ses.writepayload, 0);
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139
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140 /* set up transmitted kex packet buffer for hashing.
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141 * This is freed after the end of the kex */
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142 ses.transkexinit = buf_newcopy(ses.writepayload);
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143
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144 encrypt_packet();
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145 ses.dataallowed = 0; /* don't send other packets during kex */
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146
165
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147 TRACE(("DATAALLOWED=0"))
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148 TRACE(("-> KEXINIT"))
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149 ses.kexstate.sentkexinit = 1;
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150 }
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151
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152 /* *** NOTE regarding (send|recv)_msg_newkeys ***
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153 * Changed by mihnea from the original kex.c to set dataallowed after a
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154 * completed key exchange, no matter the order in which it was performed.
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155 * This enables client mode without affecting server functionality.
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156 */
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157
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158 /* Bring new keys into use after a key exchange, and let the client know*/
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159 void send_msg_newkeys() {
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160
165
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161 TRACE(("enter send_msg_newkeys"))
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162
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163 /* generate the kexinit request */
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164 CHECKCLEARTOWRITE();
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165 buf_putbyte(ses.writepayload, SSH_MSG_NEWKEYS);
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166 encrypt_packet();
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167
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168
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169 /* set up our state */
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170 if (ses.kexstate.recvnewkeys) {
165
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171 TRACE(("while RECVNEWKEYS=1"))
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172 gen_new_keys();
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173 kexinitialise(); /* we've finished with this kex */
165
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174 TRACE((" -> DATAALLOWED=1"))
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175 ses.dataallowed = 1; /* we can send other packets again now */
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176 ses.kexstate.donefirstkex = 1;
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177 } else {
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178 ses.kexstate.sentnewkeys = 1;
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179 TRACE(("SENTNEWKEYS=1"))
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180 }
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181
165
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182 TRACE(("-> MSG_NEWKEYS"))
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183 TRACE(("leave send_msg_newkeys"))
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184 }
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185
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186 /* Bring the new keys into use after a key exchange */
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187 void recv_msg_newkeys() {
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188
165
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189 TRACE(("<- MSG_NEWKEYS"))
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190 TRACE(("enter recv_msg_newkeys"))
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191
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192 /* simply check if we've sent SSH_MSG_NEWKEYS, and if so,
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193 * switch to the new keys */
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194 if (ses.kexstate.sentnewkeys) {
165
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195 TRACE(("while SENTNEWKEYS=1"))
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196 gen_new_keys();
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197 kexinitialise(); /* we've finished with this kex */
165
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198 TRACE((" -> DATAALLOWED=1"))
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199 ses.dataallowed = 1; /* we can send other packets again now */
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200 ses.kexstate.donefirstkex = 1;
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201 } else {
165
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202 TRACE(("RECVNEWKEYS=1"))
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203 ses.kexstate.recvnewkeys = 1;
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204 }
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205
165
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206 TRACE(("leave recv_msg_newkeys"))
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207 }
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208
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209
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210 /* Set up the kex for the first time */
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211 void kexfirstinitialise() {
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212 ses.kexstate.donefirstkex = 0;
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213
575
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214 #ifndef DISABLE_ZLIB
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215 if (opts.enable_compress) {
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216 ses.compress_algos = ssh_compress;
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217 } else
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218 #endif
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219 {
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220 ses.compress_algos = ssh_nocompress;
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221 }
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222 kexinitialise();
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223 }
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224
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225 /* Reset the kex state, ready for a new negotiation */
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226 static void kexinitialise() {
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227
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228 TRACE(("kexinitialise()"))
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229
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230 /* sent/recv'd MSG_KEXINIT */
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231 ses.kexstate.sentkexinit = 0;
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232 ses.kexstate.recvkexinit = 0;
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233
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234 /* sent/recv'd MSG_NEWKEYS */
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235 ses.kexstate.recvnewkeys = 0;
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236 ses.kexstate.sentnewkeys = 0;
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237
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238 /* first_packet_follows */
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239 ses.kexstate.firstfollows = 0;
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240
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241 ses.kexstate.datatrans = 0;
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242 ses.kexstate.datarecv = 0;
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243
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244 ses.kexstate.lastkextime = time(NULL);
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245
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246 }
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247
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248 /* Helper function for gen_new_keys, creates a hash. It makes a copy of the
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249 * already initialised hash_state hs, which should already have processed
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250 * the dh_K and hash, since these are common. X is the letter 'A', 'B' etc.
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251 * out must have at least min(SHA1_HASH_SIZE, outlen) bytes allocated.
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252 * The output will only be expanded once, as we are assured that
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253 * outlen <= 2*SHA1_HASH_SIZE for all known hashes.
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254 *
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255 * See Section 7.2 of rfc4253 (ssh transport) for details */
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256 static void hashkeys(unsigned char *out, int outlen,
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257 const hash_state * hs, const unsigned char X) {
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258
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259 hash_state hs2;
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260 unsigned char k2[SHA1_HASH_SIZE]; /* used to extending */
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261
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262 memcpy(&hs2, hs, sizeof(hash_state));
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263 sha1_process(&hs2, &X, 1);
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264 sha1_process(&hs2, ses.session_id, SHA1_HASH_SIZE);
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265 sha1_done(&hs2, out);
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266 if (SHA1_HASH_SIZE < outlen) {
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267 /* need to extend */
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268 memcpy(&hs2, hs, sizeof(hash_state));
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269 sha1_process(&hs2, out, SHA1_HASH_SIZE);
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270 sha1_done(&hs2, k2);
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271 memcpy(&out[SHA1_HASH_SIZE], k2, outlen - SHA1_HASH_SIZE);
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272 }
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273 }
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274
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275 /* Generate the actual encryption/integrity keys, using the results of the
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276 * key exchange, as specified in section 7.2 of the transport rfc 4253.
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277 * This occurs after the DH key-exchange.
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278 *
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279 * ses.newkeys is the new set of keys which are generated, these are only
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280 * taken into use after both sides have sent a newkeys message */
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281
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282 /* Originally from kex.c, generalized for cli/svr mode --mihnea */
35
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283 void gen_new_keys() {
4
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284
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285 unsigned char C2S_IV[MAX_IV_LEN];
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286 unsigned char C2S_key[MAX_KEY_LEN];
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287 unsigned char S2C_IV[MAX_IV_LEN];
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288 unsigned char S2C_key[MAX_KEY_LEN];
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289 /* unsigned char key[MAX_KEY_LEN]; */
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290 unsigned char *trans_IV, *trans_key, *recv_IV, *recv_key;
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291
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292 hash_state hs;
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293 unsigned int C2S_keysize, S2C_keysize;
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294 char mactransletter, macrecvletter; /* Client or server specific */
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295 int recv_cipher = 0, trans_cipher = 0;
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296
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297 TRACE(("enter gen_new_keys"))
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298 /* the dh_K and hash are the start of all hashes, we make use of that */
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299
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300 sha1_init(&hs);
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301 sha1_process_mp(&hs, ses.dh_K);
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302 mp_clear(ses.dh_K);
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303 m_free(ses.dh_K);
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304 sha1_process(&hs, ses.hash, SHA1_HASH_SIZE);
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305 m_burn(ses.hash, SHA1_HASH_SIZE);
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306
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307 if (IS_DROPBEAR_CLIENT) {
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308 trans_IV = C2S_IV;
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309 recv_IV = S2C_IV;
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310 trans_key = C2S_key;
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311 recv_key = S2C_key;
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312 C2S_keysize = ses.newkeys->trans.algo_crypt->keysize;
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313 S2C_keysize = ses.newkeys->recv.algo_crypt->keysize;
4
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314 mactransletter = 'E';
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315 macrecvletter = 'F';
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316 } else {
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317 trans_IV = S2C_IV;
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318 recv_IV = C2S_IV;
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319 trans_key = S2C_key;
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320 recv_key = C2S_key;
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321 C2S_keysize = ses.newkeys->recv.algo_crypt->keysize;
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322 S2C_keysize = ses.newkeys->trans.algo_crypt->keysize;
4
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323 mactransletter = 'F';
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324 macrecvletter = 'E';
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325 }
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326
35
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327 hashkeys(C2S_IV, SHA1_HASH_SIZE, &hs, 'A');
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328 hashkeys(S2C_IV, SHA1_HASH_SIZE, &hs, 'B');
4
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329 hashkeys(C2S_key, C2S_keysize, &hs, 'C');
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330 hashkeys(S2C_key, S2C_keysize, &hs, 'D');
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331
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332 recv_cipher = find_cipher(ses.newkeys->recv.algo_crypt->cipherdesc->name);
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diff changeset
333 if (recv_cipher < 0)
594
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334 dropbear_exit("Crypto error");
534
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335 if (ses.newkeys->recv.crypt_mode->start(recv_cipher,
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336 recv_IV, recv_key,
534
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diff changeset
337 ses.newkeys->recv.algo_crypt->keysize, 0,
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diff changeset
338 &ses.newkeys->recv.cipher_state) != CRYPT_OK) {
594
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diff changeset
339 dropbear_exit("Crypto error");
4
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340 }
502
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341
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342 trans_cipher = find_cipher(ses.newkeys->trans.algo_crypt->cipherdesc->name);
342
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343 if (trans_cipher < 0)
594
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344 dropbear_exit("Crypto error");
534
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345 if (ses.newkeys->trans.crypt_mode->start(trans_cipher,
502
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diff changeset
346 trans_IV, trans_key,
534
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diff changeset
347 ses.newkeys->trans.algo_crypt->keysize, 0,
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diff changeset
348 &ses.newkeys->trans.cipher_state) != CRYPT_OK) {
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diff changeset
349 dropbear_exit("Crypto error");
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350 }
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351
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352 /* MAC keys */
534
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diff changeset
353 hashkeys(ses.newkeys->trans.mackey,
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parents: 502
diff changeset
354 ses.newkeys->trans.algo_mac->keysize, &hs, mactransletter);
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parents: 502
diff changeset
355 hashkeys(ses.newkeys->recv.mackey,
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parents: 502
diff changeset
356 ses.newkeys->recv.algo_mac->keysize, &hs, macrecvletter);
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Matt Johnston <matt@ucc.asn.au>
parents: 502
diff changeset
357 ses.newkeys->trans.hash_index = find_hash(ses.newkeys->trans.algo_mac->hashdesc->name),
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parents: 502
diff changeset
358 ses.newkeys->recv.hash_index = find_hash(ses.newkeys->recv.algo_mac->hashdesc->name),
4
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359
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diff changeset
360 #ifndef DISABLE_ZLIB
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361 gen_new_zstreams();
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diff changeset
362 #endif
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363
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diff changeset
364 /* Switch over to the new keys */
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diff changeset
365 m_burn(ses.keys, sizeof(struct key_context));
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366 m_free(ses.keys);
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diff changeset
367 ses.keys = ses.newkeys;
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368 ses.newkeys = NULL;
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369
648
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parents: 603
diff changeset
370 m_burn(C2S_IV, sizeof(C2S_IV));
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parents: 603
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371 m_burn(C2S_key, sizeof(C2S_key));
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parents: 603
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372 m_burn(S2C_IV, sizeof(S2C_IV));
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parents: 603
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373 m_burn(S2C_key, sizeof(S2C_key));
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parents: 603
diff changeset
374
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parents: 116
diff changeset
375 TRACE(("leave gen_new_keys"))
4
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376 }
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377
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378 #ifndef DISABLE_ZLIB
501
d58c478bd399 Add support for [email protected] delayed compression.
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parents: 454
diff changeset
379
d58c478bd399 Add support for [email protected] delayed compression.
Matt Johnston <matt@ucc.asn.au>
parents: 454
diff changeset
380 int is_compress_trans() {
534
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parents: 502
diff changeset
381 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
382 || (ses.authstate.authdone
534
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Matt Johnston <matt@ucc.asn.au>
parents: 502
diff changeset
383 && 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
384 }
d58c478bd399 Add support for [email protected] delayed compression.
Matt Johnston <matt@ucc.asn.au>
parents: 454
diff changeset
385
d58c478bd399 Add support for [email protected] delayed compression.
Matt Johnston <matt@ucc.asn.au>
parents: 454
diff changeset
386 int is_compress_recv() {
534
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
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parents: 502
diff changeset
387 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
388 || (ses.authstate.authdone
534
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
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parents: 502
diff changeset
389 && 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
390 }
d58c478bd399 Add support for [email protected] delayed compression.
Matt Johnston <matt@ucc.asn.au>
parents: 454
diff changeset
391
4
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diff changeset
392 /* Set up new zlib compression streams, close the old ones. Only
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parents:
diff changeset
393 * called from gen_new_keys() */
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parents:
diff changeset
394 static void gen_new_zstreams() {
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parents:
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395
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396 /* create new zstreams */
534
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
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parents: 502
diff changeset
397 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
398 || 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
399 ses.newkeys->recv.zstream = (z_streamp)m_malloc(sizeof(z_stream));
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents: 502
diff changeset
400 ses.newkeys->recv.zstream->zalloc = Z_NULL;
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents: 502
diff changeset
401 ses.newkeys->recv.zstream->zfree = Z_NULL;
4
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diff changeset
402
534
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
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parents: 502
diff changeset
403 if (inflateInit(ses.newkeys->recv.zstream) != Z_OK) {
4
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parents:
diff changeset
404 dropbear_exit("zlib error");
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diff changeset
405 }
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diff changeset
406 } else {
534
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents: 502
diff changeset
407 ses.newkeys->recv.zstream = NULL;
4
fe6bca95afa7 Makefile.in contains updated files required
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diff changeset
408 }
fe6bca95afa7 Makefile.in contains updated files required
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parents:
diff changeset
409
534
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents: 502
diff changeset
410 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
411 || 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
412 ses.newkeys->trans.zstream = (z_streamp)m_malloc(sizeof(z_stream));
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents: 502
diff changeset
413 ses.newkeys->trans.zstream->zalloc = Z_NULL;
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents: 502
diff changeset
414 ses.newkeys->trans.zstream->zfree = Z_NULL;
4
fe6bca95afa7 Makefile.in contains updated files required
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parents:
diff changeset
415
555
daf52f813328 - Add option to change zlib windowBits/memLevel
Matt Johnston <matt@ucc.asn.au>
parents: 534
diff changeset
416 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
417 Z_DEFLATED, DROPBEAR_ZLIB_WINDOW_BITS,
daf52f813328 - Add option to change zlib windowBits/memLevel
Matt Johnston <matt@ucc.asn.au>
parents: 534
diff changeset
418 DROPBEAR_ZLIB_MEM_LEVEL, Z_DEFAULT_STRATEGY)
4
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parents:
diff changeset
419 != Z_OK) {
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diff changeset
420 dropbear_exit("zlib error");
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parents:
diff changeset
421 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
422 } else {
534
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents: 502
diff changeset
423 ses.newkeys->trans.zstream = NULL;
4
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parents:
diff changeset
424 }
501
d58c478bd399 Add support for [email protected] delayed compression.
Matt Johnston <matt@ucc.asn.au>
parents: 454
diff changeset
425
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
426 /* clean up old keys */
534
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents: 502
diff changeset
427 if (ses.keys->recv.zstream != NULL) {
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents: 502
diff changeset
428 if (inflateEnd(ses.keys->recv.zstream) == Z_STREAM_ERROR) {
4
fe6bca95afa7 Makefile.in contains updated files required
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parents:
diff changeset
429 /* 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
430 dropbear_exit("Crypto error");
4
fe6bca95afa7 Makefile.in contains updated files required
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diff changeset
431 }
534
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents: 502
diff changeset
432 m_free(ses.keys->recv.zstream);
4
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parents:
diff changeset
433 }
534
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents: 502
diff changeset
434 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
435 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
436 /* 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
437 dropbear_exit("Crypto error");
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
438 }
534
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents: 502
diff changeset
439 m_free(ses.keys->trans.zstream);
4
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
440 }
fe6bca95afa7 Makefile.in contains updated files required
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parents:
diff changeset
441 }
501
d58c478bd399 Add support for [email protected] delayed compression.
Matt Johnston <matt@ucc.asn.au>
parents: 454
diff changeset
442 #endif /* DISABLE_ZLIB */
4
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parents:
diff changeset
443
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
444
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
445 /* 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
446 * 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
447 * 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
448 * 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
449 * 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
450 * initiate the diffie-hellman key exchange */
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parents:
diff changeset
451
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
452 /* Originally from kex.c, generalized for cli/svr mode --mihnea */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
453 /* Belongs in common_kex.c where it should be moved after review */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
454 void recv_msg_kexinit() {
fe6bca95afa7 Makefile.in contains updated files required
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parents:
diff changeset
455
257
63601217f5ab * options.h, common-kex.c: fix support of 4096 byte host keys
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parents: 228
diff changeset
456 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
457 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
458 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
459
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
460 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
461 TRACE(("enter recv_msg_kexinit"))
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 if (!ses.kexstate.sentkexinit) {
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
464 /* we need to send a kex packet */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
465 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
466 TRACE(("continue recv_msg_kexinit: sent kexinit"))
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
467 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
468
257
63601217f5ab * options.h, common-kex.c: fix support of 4096 byte host keys
Matt Johnston <matt@ucc.asn.au>
parents: 228
diff changeset
469 /* 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
470 local_ident_len = strlen(LOCAL_IDENT);
63601217f5ab * options.h, common-kex.c: fix support of 4096 byte host keys
Matt Johnston <matt@ucc.asn.au>
parents: 228
diff changeset
471 remote_ident_len = strlen((char*)ses.remoteident);
63601217f5ab * options.h, common-kex.c: fix support of 4096 byte host keys
Matt Johnston <matt@ucc.asn.au>
parents: 228
diff changeset
472
63601217f5ab * options.h, common-kex.c: fix support of 4096 byte host keys
Matt Johnston <matt@ucc.asn.au>
parents: 228
diff changeset
473 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
474 + 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
475 + 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
476
63601217f5ab * options.h, common-kex.c: fix support of 4096 byte host keys
Matt Johnston <matt@ucc.asn.au>
parents: 228
diff changeset
477 ses.kexhashbuf = buf_new(kexhashbuf_len);
4
fe6bca95afa7 Makefile.in contains updated files required
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parents:
diff changeset
478
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
479 if (IS_DROPBEAR_CLIENT) {
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
480
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
481 /* read the peer's choice of algos */
33
f789045062e6 Progressing client support
Matt Johnston <matt@ucc.asn.au>
parents: 26
diff changeset
482 read_kex_algos();
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
483
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
484 /* V_C, the client's version string (CR and NL excluded) */
4
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
485 buf_putstring(ses.kexhashbuf,
257
63601217f5ab * options.h, common-kex.c: fix support of 4096 byte host keys
Matt Johnston <matt@ucc.asn.au>
parents: 228
diff changeset
486 (unsigned char*)LOCAL_IDENT, local_ident_len);
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
487 /* V_S, the server's version string (CR and NL excluded) */
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 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
489
26
0969767bca0d snapshot of stuff
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parents: 22
diff changeset
490 /* I_C, the payload of the client's SSH_MSG_KEXINIT */
4
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
491 buf_putstring(ses.kexhashbuf,
257
63601217f5ab * options.h, common-kex.c: fix support of 4096 byte host keys
Matt Johnston <matt@ucc.asn.au>
parents: 228
diff changeset
492 ses.transkexinit->data, ses.transkexinit->len);
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
493 /* I_S, the payload of the server's SSH_MSG_KEXINIT */
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
494 buf_setpos(ses.payload, 0);
257
63601217f5ab * options.h, common-kex.c: fix support of 4096 byte host keys
Matt Johnston <matt@ucc.asn.au>
parents: 228
diff changeset
495 buf_putstring(ses.kexhashbuf, ses.payload->data, ses.payload->len);
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
496
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
497 } else {
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
498 /* SERVER */
4
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();
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
502 /* V_C, the client's version string (CR and NL excluded) */
257
63601217f5ab * options.h, common-kex.c: fix support of 4096 byte host keys
Matt Johnston <matt@ucc.asn.au>
parents: 228
diff changeset
503 buf_putstring(ses.kexhashbuf, ses.remoteident, remote_ident_len);
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
504 /* V_S, the server's version string (CR and NL excluded) */
257
63601217f5ab * options.h, common-kex.c: fix support of 4096 byte host keys
Matt Johnston <matt@ucc.asn.au>
parents: 228
diff changeset
505 buf_putstring(ses.kexhashbuf,
63601217f5ab * options.h, common-kex.c: fix support of 4096 byte host keys
Matt Johnston <matt@ucc.asn.au>
parents: 228
diff changeset
506 (unsigned char*)LOCAL_IDENT, local_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 */
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
509 buf_setpos(ses.payload, 0);
257
63601217f5ab * options.h, common-kex.c: fix support of 4096 byte host keys
Matt Johnston <matt@ucc.asn.au>
parents: 228
diff changeset
510 buf_putstring(ses.kexhashbuf, ses.payload->data, 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
511
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
512 /* I_S, the payload of the server's SSH_MSG_KEXINIT */
4
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
513 buf_putstring(ses.kexhashbuf,
257
63601217f5ab * options.h, common-kex.c: fix support of 4096 byte host keys
Matt Johnston <matt@ucc.asn.au>
parents: 228
diff changeset
514 ses.transkexinit->data, ses.transkexinit->len);
63601217f5ab * options.h, common-kex.c: fix support of 4096 byte host keys
Matt Johnston <matt@ucc.asn.au>
parents: 228
diff changeset
515
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
516 ses.requirenext = SSH_MSG_KEXDH_INIT;
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
517 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
518
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
519 buf_free(ses.transkexinit);
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
520 ses.transkexinit = NULL;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
521 /* 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
522
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
523 ses.kexstate.recvkexinit = 1;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
524
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
525 TRACE(("leave recv_msg_kexinit"))
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
526 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
527
595
2895626d864f Add diffie-hellman-group14-sha1 KEX method
Matt Johnston <matt@ucc.asn.au>
parents: 594
diff changeset
528 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
529 {
2895626d864f Add diffie-hellman-group14-sha1 KEX method
Matt Johnston <matt@ucc.asn.au>
parents: 594
diff changeset
530 switch (ses.newkeys->algo_kex) {
2895626d864f Add diffie-hellman-group14-sha1 KEX method
Matt Johnston <matt@ucc.asn.au>
parents: 594
diff changeset
531 case DROPBEAR_KEX_DH_GROUP1:
2895626d864f Add diffie-hellman-group14-sha1 KEX method
Matt Johnston <matt@ucc.asn.au>
parents: 594
diff changeset
532 bytes_to_mp(dh_p, dh_p_1, DH_P_1_LEN);
2895626d864f Add diffie-hellman-group14-sha1 KEX method
Matt Johnston <matt@ucc.asn.au>
parents: 594
diff changeset
533 break;
2895626d864f Add diffie-hellman-group14-sha1 KEX method
Matt Johnston <matt@ucc.asn.au>
parents: 594
diff changeset
534 case DROPBEAR_KEX_DH_GROUP14:
2895626d864f Add diffie-hellman-group14-sha1 KEX method
Matt Johnston <matt@ucc.asn.au>
parents: 594
diff changeset
535 bytes_to_mp(dh_p, dh_p_14, DH_P_14_LEN);
2895626d864f Add diffie-hellman-group14-sha1 KEX method
Matt Johnston <matt@ucc.asn.au>
parents: 594
diff changeset
536 break;
2895626d864f Add diffie-hellman-group14-sha1 KEX method
Matt Johnston <matt@ucc.asn.au>
parents: 594
diff changeset
537 }
2895626d864f Add diffie-hellman-group14-sha1 KEX method
Matt Johnston <matt@ucc.asn.au>
parents: 594
diff changeset
538 }
2895626d864f Add diffie-hellman-group14-sha1 KEX method
Matt Johnston <matt@ucc.asn.au>
parents: 594
diff changeset
539
26
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Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
540 /* 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
541 * 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
542 /* dh_pub and dh_priv MUST be already initialised */
26
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Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
543 void gen_kexdh_vals(mp_int *dh_pub, mp_int *dh_priv) {
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
544
84
29a5c7c62350 default initialisers for mp_ints
Matt Johnston <matt@ucc.asn.au>
parents: 79
diff changeset
545 DEF_MP_INT(dh_p);
29a5c7c62350 default initialisers for mp_ints
Matt Johnston <matt@ucc.asn.au>
parents: 79
diff changeset
546 DEF_MP_INT(dh_q);
29a5c7c62350 default initialisers for mp_ints
Matt Johnston <matt@ucc.asn.au>
parents: 79
diff changeset
547 DEF_MP_INT(dh_g);
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
548
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
549 TRACE(("enter send_msg_kexdh_reply"))
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
550
84
29a5c7c62350 default initialisers for mp_ints
Matt Johnston <matt@ucc.asn.au>
parents: 79
diff changeset
551 m_mp_init_multi(&dh_g, &dh_p, &dh_q, NULL);
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
552
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
553 /* read the prime and generator*/
595
2895626d864f Add diffie-hellman-group14-sha1 KEX method
Matt Johnston <matt@ucc.asn.au>
parents: 594
diff changeset
554 load_dh_p(&dh_p);
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
555
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
556 if (mp_set_int(&dh_g, DH_G_VAL) != MP_OKAY) {
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
557 dropbear_exit("Diffie-Hellman error");
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
558 }
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
559
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
560 /* calculate q = (p-1)/2 */
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
561 /* dh_priv is just a temp var here */
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
562 if (mp_sub_d(&dh_p, 1, dh_priv) != MP_OKAY) {
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
563 dropbear_exit("Diffie-Hellman error");
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
564 }
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
565 if (mp_div_2(dh_priv, &dh_q) != MP_OKAY) {
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
566 dropbear_exit("Diffie-Hellman error");
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
567 }
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
568
188
c9483550701b - refactored random mp_int generation and byte->mp_int code
Matt Johnston <matt@ucc.asn.au>
parents: 179
diff changeset
569 /* Generate a private portion 0 < dh_priv < dh_q */
c9483550701b - refactored random mp_int generation and byte->mp_int code
Matt Johnston <matt@ucc.asn.au>
parents: 179
diff changeset
570 gen_random_mpint(&dh_q, dh_priv);
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
571
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
572 /* f = g^y mod p */
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
573 if (mp_exptmod(&dh_g, dh_priv, &dh_p, dh_pub) != MP_OKAY) {
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
574 dropbear_exit("Diffie-Hellman error");
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
575 }
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
576 mp_clear_multi(&dh_g, &dh_p, &dh_q, NULL);
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
577 }
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
578
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
579 /* 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
580 * of dh_e/dh_f etc. Hence these arguments:
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
581 * 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
582 * vice-versa. dh_priv is the x/y value corresponding to dh_pub_us */
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
583 void kexdh_comb_key(mp_int *dh_pub_us, mp_int *dh_priv, mp_int *dh_pub_them,
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
584 sign_key *hostkey) {
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
585
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
586 mp_int dh_p;
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
587 mp_int *dh_e = NULL, *dh_f = NULL;
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
588 hash_state hs;
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
589
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
590 /* read the prime and generator*/
342
3e098639b05f From Erik Hovland
Matt Johnston <matt@ucc.asn.au>
parents: 257
diff changeset
591 m_mp_init(&dh_p);
595
2895626d864f Add diffie-hellman-group14-sha1 KEX method
Matt Johnston <matt@ucc.asn.au>
parents: 594
diff changeset
592 load_dh_p(&dh_p);
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
593
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
594 /* Check that dh_pub_them (dh_e or dh_f) is in the range [1, p-1] */
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
595 if (mp_cmp(dh_pub_them, &dh_p) != MP_LT
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
596 || mp_cmp_d(dh_pub_them, 0) != MP_GT) {
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
597 dropbear_exit("Diffie-Hellman error");
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
598 }
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 /* K = e^y mod p = f^x mod p */
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
601 ses.dh_K = (mp_int*)m_malloc(sizeof(mp_int));
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
602 m_mp_init(ses.dh_K);
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
603 if (mp_exptmod(dh_pub_them, dh_priv, &dh_p, ses.dh_K) != MP_OKAY) {
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
604 dropbear_exit("Diffie-Hellman error");
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
605 }
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
606
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
607 /* clear no longer needed vars */
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
608 mp_clear_multi(&dh_p, NULL);
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
609
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
610 /* 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
611 * not vice-versaing for client/server */
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
612 if (IS_DROPBEAR_CLIENT) {
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
613 dh_e = dh_pub_us;
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
614 dh_f = dh_pub_them;
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
615 } else {
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
616 dh_e = dh_pub_them;
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
617 dh_f = dh_pub_us;
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
618 }
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
619
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
620 /* 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
621 /* K_S, the host key */
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
622 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
623 /* e, exchange value sent by the client */
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
624 buf_putmpint(ses.kexhashbuf, dh_e);
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
625 /* f, exchange value sent by the server */
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
626 buf_putmpint(ses.kexhashbuf, dh_f);
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
627 /* K, the shared secret */
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
628 buf_putmpint(ses.kexhashbuf, ses.dh_K);
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 /* calculate the hash H to sign */
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
631 sha1_init(&hs);
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
632 buf_setpos(ses.kexhashbuf, 0);
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
633 sha1_process(&hs, buf_getptr(ses.kexhashbuf, ses.kexhashbuf->len),
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
634 ses.kexhashbuf->len);
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
635 sha1_done(&hs, ses.hash);
35
0ad5fb979f42 set the isserver flag (oops)
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
636
0ad5fb979f42 set the isserver flag (oops)
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
637 buf_burn(ses.kexhashbuf);
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
638 buf_free(ses.kexhashbuf);
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
639 ses.kexhashbuf = NULL;
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
640
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
641 /* first time around, we set the session_id to H */
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
642 if (ses.session_id == NULL) {
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
643 /* create the session_id, this never needs freeing */
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
644 ses.session_id = (unsigned char*)m_malloc(SHA1_HASH_SIZE);
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
645 memcpy(ses.session_id, ses.hash, SHA1_HASH_SIZE);
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
646 }
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
647 }
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
648
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
649 /* 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
650 * algos for the client or server. */
33
f789045062e6 Progressing client support
Matt Johnston <matt@ucc.asn.au>
parents: 26
diff changeset
651 static void read_kex_algos() {
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
652
36
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
653 /* for asymmetry */
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
654 algo_type * c2s_hash_algo = NULL;
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
655 algo_type * s2c_hash_algo = NULL;
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
656 algo_type * c2s_cipher_algo = NULL;
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
657 algo_type * s2c_cipher_algo = NULL;
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
658 algo_type * c2s_comp_algo = NULL;
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
659 algo_type * s2c_comp_algo = NULL;
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
660 /* the generic one */
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
661 algo_type * algo = NULL;
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
662
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
663 /* which algo couldn't match */
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
664 char * erralgo = NULL;
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
665
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
666 int goodguess = 0;
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
667 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
668 true after */
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
669
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
670 buf_incrpos(ses.payload, 16); /* start after the cookie */
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
671
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
672 ses.newkeys = (struct key_context*)m_malloc(sizeof(struct key_context));
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
673
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
674 /* kex_algorithms */
33
f789045062e6 Progressing client support
Matt Johnston <matt@ucc.asn.au>
parents: 26
diff changeset
675 algo = ses.buf_match_algo(ses.payload, sshkex, &goodguess);
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
676 allgood &= goodguess;
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
677 if (algo == NULL) {
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
678 erralgo = "kex";
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
679 goto error;
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
680 }
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
681 TRACE(("kex algo %s", algo->name))
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
682 ses.newkeys->algo_kex = algo->val;
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
683
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
684 /* server_host_key_algorithms */
33
f789045062e6 Progressing client support
Matt Johnston <matt@ucc.asn.au>
parents: 26
diff changeset
685 algo = ses.buf_match_algo(ses.payload, sshhostkey, &goodguess);
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
686 allgood &= goodguess;
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
687 if (algo == NULL) {
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
688 erralgo = "hostkey";
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
689 goto error;
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
690 }
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
691 TRACE(("hostkey algo %s", algo->name))
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
692 ses.newkeys->algo_hostkey = algo->val;
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
693
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
694 /* encryption_algorithms_client_to_server */
36
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
695 c2s_cipher_algo = ses.buf_match_algo(ses.payload, sshciphers, &goodguess);
116
2010f4119c1a Check for non-matching algos properly
Matt Johnston <matt@ucc.asn.au>
parents: 84
diff changeset
696 if (c2s_cipher_algo == NULL) {
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
697 erralgo = "enc c->s";
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
698 goto error;
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
699 }
228
5e4110bb753a - Fixed twofish algorithm naming so it actually works.
Matt Johnston <matt@ucc.asn.au>
parents: 227
diff changeset
700 TRACE(("enc c2s is %s", c2s_cipher_algo->name))
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
701
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
702 /* encryption_algorithms_server_to_client */
36
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
703 s2c_cipher_algo = ses.buf_match_algo(ses.payload, sshciphers, &goodguess);
116
2010f4119c1a Check for non-matching algos properly
Matt Johnston <matt@ucc.asn.au>
parents: 84
diff changeset
704 if (s2c_cipher_algo == NULL) {
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
705 erralgo = "enc s->c";
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
706 goto error;
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
707 }
228
5e4110bb753a - Fixed twofish algorithm naming so it actually works.
Matt Johnston <matt@ucc.asn.au>
parents: 227
diff changeset
708 TRACE(("enc s2c is %s", s2c_cipher_algo->name))
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
709
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
710 /* mac_algorithms_client_to_server */
36
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
711 c2s_hash_algo = ses.buf_match_algo(ses.payload, sshhashes, &goodguess);
116
2010f4119c1a Check for non-matching algos properly
Matt Johnston <matt@ucc.asn.au>
parents: 84
diff changeset
712 if (c2s_hash_algo == NULL) {
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
713 erralgo = "mac c->s";
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
714 goto error;
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
715 }
228
5e4110bb753a - Fixed twofish algorithm naming so it actually works.
Matt Johnston <matt@ucc.asn.au>
parents: 227
diff changeset
716 TRACE(("hash c2s is %s", c2s_hash_algo->name))
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
717
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
718 /* mac_algorithms_server_to_client */
36
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
719 s2c_hash_algo = ses.buf_match_algo(ses.payload, sshhashes, &goodguess);
116
2010f4119c1a Check for non-matching algos properly
Matt Johnston <matt@ucc.asn.au>
parents: 84
diff changeset
720 if (s2c_hash_algo == NULL) {
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
721 erralgo = "mac s->c";
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
722 goto error;
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
723 }
228
5e4110bb753a - Fixed twofish algorithm naming so it actually works.
Matt Johnston <matt@ucc.asn.au>
parents: 227
diff changeset
724 TRACE(("hash s2c is %s", s2c_hash_algo->name))
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
725
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
726 /* compression_algorithms_client_to_server */
575
f9b5dc0cba61 - Disable compression for non-final multihops
Matt Johnston <matt@ucc.asn.au>
parents: 555
diff changeset
727 c2s_comp_algo = ses.buf_match_algo(ses.payload, ses.compress_algos, &goodguess);
116
2010f4119c1a Check for non-matching algos properly
Matt Johnston <matt@ucc.asn.au>
parents: 84
diff changeset
728 if (c2s_comp_algo == NULL) {
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
729 erralgo = "comp c->s";
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
730 goto error;
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
731 }
228
5e4110bb753a - Fixed twofish algorithm naming so it actually works.
Matt Johnston <matt@ucc.asn.au>
parents: 227
diff changeset
732 TRACE(("hash c2s is %s", c2s_comp_algo->name))
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
733
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
734 /* compression_algorithms_server_to_client */
575
f9b5dc0cba61 - Disable compression for non-final multihops
Matt Johnston <matt@ucc.asn.au>
parents: 555
diff changeset
735 s2c_comp_algo = ses.buf_match_algo(ses.payload, ses.compress_algos, &goodguess);
116
2010f4119c1a Check for non-matching algos properly
Matt Johnston <matt@ucc.asn.au>
parents: 84
diff changeset
736 if (s2c_comp_algo == NULL) {
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
737 erralgo = "comp s->c";
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
738 goto error;
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
739 }
228
5e4110bb753a - Fixed twofish algorithm naming so it actually works.
Matt Johnston <matt@ucc.asn.au>
parents: 227
diff changeset
740 TRACE(("hash s2c is %s", s2c_comp_algo->name))
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
741
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
742 /* languages_client_to_server */
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
743 buf_eatstring(ses.payload);
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
744
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
745 /* languages_server_to_client */
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
746 buf_eatstring(ses.payload);
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
747
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
748 /* 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
749 if (buf_getbool(ses.payload)) {
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
750 ses.kexstate.firstfollows = 1;
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
751 /* 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
752 if (!allgood) {
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
753 ses.ignorenext = 1;
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
754 }
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
755 }
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
756
36
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
757 /* Handle the asymmetry */
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
758 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
759 ses.newkeys->recv.algo_crypt =
36
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
760 (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
761 ses.newkeys->trans.algo_crypt =
36
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
762 (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
763 ses.newkeys->recv.crypt_mode =
502
43bbe17d6ba0 - Add Counter Mode support
Matt Johnston <matt@ucc.asn.au>
parents: 501
diff changeset
764 (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
765 ses.newkeys->trans.crypt_mode =
502
43bbe17d6ba0 - Add Counter Mode support
Matt Johnston <matt@ucc.asn.au>
parents: 501
diff changeset
766 (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
767 ses.newkeys->recv.algo_mac =
36
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
768 (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
769 ses.newkeys->trans.algo_mac =
36
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
770 (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
771 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
772 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
773 } else {
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
774 /* SERVER */
534
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents: 502
diff changeset
775 ses.newkeys->recv.algo_crypt =
36
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
776 (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
777 ses.newkeys->trans.algo_crypt =
36
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
778 (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
779 ses.newkeys->recv.crypt_mode =
502
43bbe17d6ba0 - Add Counter Mode support
Matt Johnston <matt@ucc.asn.au>
parents: 501
diff changeset
780 (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
781 ses.newkeys->trans.crypt_mode =
502
43bbe17d6ba0 - Add Counter Mode support
Matt Johnston <matt@ucc.asn.au>
parents: 501
diff changeset
782 (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
783 ses.newkeys->recv.algo_mac =
36
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
784 (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
785 ses.newkeys->trans.algo_mac =
36
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
786 (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
787 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
788 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
789 }
a600c015562d Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
790
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
791 /* reserved for future extensions */
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
792 buf_getint(ses.payload);
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
793 return;
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
794
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
795 error:
594
a98a2138364a Improve capitalisation for all logged strings
Matt Johnston <matt@ucc.asn.au>
parents: 575
diff changeset
796 dropbear_exit("No matching algo %s", erralgo);
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
797 }