annotate cli-kex.c @ 753:d63ef1e211ea

Take transmit and receive keys into use separately
author Matt Johnston <matt@ucc.asn.au>
date Thu, 04 Apr 2013 00:18:50 +0800
parents 15999b098cc9
children a9f2a6ae4eb5
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1 /*
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2 * Dropbear - a SSH2 server
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3 *
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4 * Copyright (c) 2002-2004 Matt Johnston
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5 * Copyright (c) 2004 by Mihnea Stoenescu
26
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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 "session.h"
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28 #include "dbutil.h"
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29 #include "algo.h"
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30 #include "buffer.h"
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31 #include "session.h"
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32 #include "kex.h"
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33 #include "ssh.h"
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34 #include "packet.h"
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35 #include "bignum.h"
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36 #include "random.h"
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37 #include "runopts.h"
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38 #include "signkey.h"
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41 static void checkhostkey(unsigned char* keyblob, unsigned int keybloblen);
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42 #define MAX_KNOWNHOSTS_LINE 4500
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43
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44 void send_msg_kexdh_init() {
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45 TRACE(("send_msg_kexdh_init()"))
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46 if ((cli_ses.dh_e && cli_ses.dh_x
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47 && cli_ses.dh_val_algo == ses.newkeys->algo_kex)) {
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48 TRACE(("reusing existing dh_e from first_kex_packet_follows"))
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49 } else {
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50 if (!cli_ses.dh_e || !cli_ses.dh_e) {
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51 cli_ses.dh_e = (mp_int*)m_malloc(sizeof(mp_int));
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52 cli_ses.dh_x = (mp_int*)m_malloc(sizeof(mp_int));
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53 m_mp_init_multi(cli_ses.dh_e, cli_ses.dh_x, NULL);
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54 }
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55
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56 gen_kexdh_vals(cli_ses.dh_e, cli_ses.dh_x);
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57 cli_ses.dh_val_algo = ses.newkeys->algo_kex;
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58 }
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59
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60 CHECKCLEARTOWRITE();
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61 buf_putbyte(ses.writepayload, SSH_MSG_KEXDH_INIT);
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62 buf_putmpint(ses.writepayload, cli_ses.dh_e);
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63 encrypt_packet();
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64 // XXX fixme
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65 //ses.requirenext = SSH_MSG_KEXDH_REPLY;
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66 }
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67
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68 /* Handle a diffie-hellman key exchange reply. */
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69 void recv_msg_kexdh_reply() {
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71 DEF_MP_INT(dh_f);
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72 sign_key *hostkey = NULL;
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73 unsigned int type, keybloblen;
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74 unsigned char* keyblob = NULL;
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75
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77 TRACE(("enter recv_msg_kexdh_reply"))
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79 if (cli_ses.kex_state != KEXDH_INIT_SENT) {
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80 dropbear_exit("Received out-of-order kexdhreply");
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81 }
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82 m_mp_init(&dh_f);
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83 type = ses.newkeys->algo_hostkey;
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84 TRACE(("type is %d", type))
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85
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86 hostkey = new_sign_key();
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87 keybloblen = buf_getint(ses.payload);
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88
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89 keyblob = buf_getptr(ses.payload, keybloblen);
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90 if (!ses.kexstate.donefirstkex) {
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91 /* Only makes sense the first time */
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92 checkhostkey(keyblob, keybloblen);
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93 }
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94
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95 if (buf_get_pub_key(ses.payload, hostkey, &type) != DROPBEAR_SUCCESS) {
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96 TRACE(("failed getting pubkey"))
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97 dropbear_exit("Bad KEX packet");
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98 }
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99
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100 if (buf_getmpint(ses.payload, &dh_f) != DROPBEAR_SUCCESS) {
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101 TRACE(("failed getting mpint"))
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102 dropbear_exit("Bad KEX packet");
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103 }
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104
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105 kexdh_comb_key(cli_ses.dh_e, cli_ses.dh_x, &dh_f, hostkey);
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106 mp_clear(&dh_f);
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107 mp_clear_multi(cli_ses.dh_e, cli_ses.dh_x, NULL);
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108 m_free(cli_ses.dh_e);
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109 m_free(cli_ses.dh_x);
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110 cli_ses.dh_val_algo = DROPBEAR_KEX_NONE;
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111
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112 if (buf_verify(ses.payload, hostkey, ses.hash, SHA1_HASH_SIZE)
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113 != DROPBEAR_SUCCESS) {
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114 dropbear_exit("Bad hostkey signature");
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115 }
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116
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117 sign_key_free(hostkey);
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118 hostkey = NULL;
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119
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120 send_msg_newkeys();
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121 ses.requirenext = SSH_MSG_NEWKEYS;
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122 TRACE(("leave recv_msg_kexdh_init"))
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123 }
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124
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125 static void ask_to_confirm(unsigned char* keyblob, unsigned int keybloblen) {
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126
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127 char* fp = NULL;
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128 FILE *tty = NULL;
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129 char response = 'z';
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130
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131 fp = sign_key_fingerprint(keyblob, keybloblen);
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132 if (cli_opts.always_accept_key) {
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133 fprintf(stderr, "\nHost '%s' key accepted unconditionally.\n(fingerprint %s)\n",
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134 cli_opts.remotehost,
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135 fp);
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136 m_free(fp);
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137 return;
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138 }
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139 fprintf(stderr, "\nHost '%s' is not in the trusted hosts file.\n(fingerprint %s)\nDo you want to continue connecting? (y/n) ",
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140 cli_opts.remotehost,
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141 fp);
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142 m_free(fp);
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143
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144 tty = fopen(_PATH_TTY, "r");
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145 if (tty) {
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Matt Johnston <matt@ucc.asn.au>
parents: 165
diff changeset
146 response = getc(tty);
a62cb364f615 Read "y/n" response for fingerprints from /dev/tty directly so that dbclient
Matt Johnston <matt@ucc.asn.au>
parents: 165
diff changeset
147 fclose(tty);
a62cb364f615 Read "y/n" response for fingerprints from /dev/tty directly so that dbclient
Matt Johnston <matt@ucc.asn.au>
parents: 165
diff changeset
148 } else {
a62cb364f615 Read "y/n" response for fingerprints from /dev/tty directly so that dbclient
Matt Johnston <matt@ucc.asn.au>
parents: 165
diff changeset
149 response = getc(stdin);
a62cb364f615 Read "y/n" response for fingerprints from /dev/tty directly so that dbclient
Matt Johnston <matt@ucc.asn.au>
parents: 165
diff changeset
150 }
a62cb364f615 Read "y/n" response for fingerprints from /dev/tty directly so that dbclient
Matt Johnston <matt@ucc.asn.au>
parents: 165
diff changeset
151
a62cb364f615 Read "y/n" response for fingerprints from /dev/tty directly so that dbclient
Matt Johnston <matt@ucc.asn.au>
parents: 165
diff changeset
152 if (response == 'y') {
51
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
153 return;
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
154 }
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
155
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
156 dropbear_exit("Didn't validate host key");
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
157 }
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
158
436
7282370416a0 Improve known_hosts checking.
Matt Johnston <matt@ucc.asn.au>
parents: 418
diff changeset
159 static FILE* open_known_hosts_file(int * readonly)
7282370416a0 Improve known_hosts checking.
Matt Johnston <matt@ucc.asn.au>
parents: 418
diff changeset
160 {
7282370416a0 Improve known_hosts checking.
Matt Johnston <matt@ucc.asn.au>
parents: 418
diff changeset
161 FILE * hostsfile = NULL;
51
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
162 char * filename = NULL;
318
9916350d7d8b don't fail fatally if the client can't get homedir from getpwuid(), fallback
Matt Johnston <matt@ucc.asn.au>
parents: 170
diff changeset
163 char * homedir = NULL;
51
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
164
322
84aa4e60bd3c Look at HOME before /etc/passwd when looking for ~/.ssh/known_hosts
Matt Johnston <matt@ucc.asn.au>
parents: 318
diff changeset
165 homedir = getenv("HOME");
51
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
166
322
84aa4e60bd3c Look at HOME before /etc/passwd when looking for ~/.ssh/known_hosts
Matt Johnston <matt@ucc.asn.au>
parents: 318
diff changeset
167 if (!homedir) {
436
7282370416a0 Improve known_hosts checking.
Matt Johnston <matt@ucc.asn.au>
parents: 418
diff changeset
168 struct passwd * pw = NULL;
322
84aa4e60bd3c Look at HOME before /etc/passwd when looking for ~/.ssh/known_hosts
Matt Johnston <matt@ucc.asn.au>
parents: 318
diff changeset
169 pw = getpwuid(getuid());
84aa4e60bd3c Look at HOME before /etc/passwd when looking for ~/.ssh/known_hosts
Matt Johnston <matt@ucc.asn.au>
parents: 318
diff changeset
170 if (pw) {
84aa4e60bd3c Look at HOME before /etc/passwd when looking for ~/.ssh/known_hosts
Matt Johnston <matt@ucc.asn.au>
parents: 318
diff changeset
171 homedir = pw->pw_dir;
84aa4e60bd3c Look at HOME before /etc/passwd when looking for ~/.ssh/known_hosts
Matt Johnston <matt@ucc.asn.au>
parents: 318
diff changeset
172 }
51
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
173 }
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
174
318
9916350d7d8b don't fail fatally if the client can't get homedir from getpwuid(), fallback
Matt Johnston <matt@ucc.asn.au>
parents: 170
diff changeset
175 if (homedir) {
436
7282370416a0 Improve known_hosts checking.
Matt Johnston <matt@ucc.asn.au>
parents: 418
diff changeset
176 unsigned int len;
318
9916350d7d8b don't fail fatally if the client can't get homedir from getpwuid(), fallback
Matt Johnston <matt@ucc.asn.au>
parents: 170
diff changeset
177 len = strlen(homedir);
9916350d7d8b don't fail fatally if the client can't get homedir from getpwuid(), fallback
Matt Johnston <matt@ucc.asn.au>
parents: 170
diff changeset
178 filename = m_malloc(len + 18); /* "/.ssh/known_hosts" and null-terminator*/
51
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
179
318
9916350d7d8b don't fail fatally if the client can't get homedir from getpwuid(), fallback
Matt Johnston <matt@ucc.asn.au>
parents: 170
diff changeset
180 snprintf(filename, len+18, "%s/.ssh", homedir);
9916350d7d8b don't fail fatally if the client can't get homedir from getpwuid(), fallback
Matt Johnston <matt@ucc.asn.au>
parents: 170
diff changeset
181 /* Check that ~/.ssh exists - easiest way is just to mkdir */
9916350d7d8b don't fail fatally if the client can't get homedir from getpwuid(), fallback
Matt Johnston <matt@ucc.asn.au>
parents: 170
diff changeset
182 if (mkdir(filename, S_IRWXU) != 0) {
9916350d7d8b don't fail fatally if the client can't get homedir from getpwuid(), fallback
Matt Johnston <matt@ucc.asn.au>
parents: 170
diff changeset
183 if (errno != EEXIST) {
322
84aa4e60bd3c Look at HOME before /etc/passwd when looking for ~/.ssh/known_hosts
Matt Johnston <matt@ucc.asn.au>
parents: 318
diff changeset
184 dropbear_log(LOG_INFO, "Warning: failed creating %s/.ssh: %s",
84aa4e60bd3c Look at HOME before /etc/passwd when looking for ~/.ssh/known_hosts
Matt Johnston <matt@ucc.asn.au>
parents: 318
diff changeset
185 homedir, strerror(errno));
318
9916350d7d8b don't fail fatally if the client can't get homedir from getpwuid(), fallback
Matt Johnston <matt@ucc.asn.au>
parents: 170
diff changeset
186 TRACE(("mkdir didn't work: %s", strerror(errno)))
436
7282370416a0 Improve known_hosts checking.
Matt Johnston <matt@ucc.asn.au>
parents: 418
diff changeset
187 goto out;
318
9916350d7d8b don't fail fatally if the client can't get homedir from getpwuid(), fallback
Matt Johnston <matt@ucc.asn.au>
parents: 170
diff changeset
188 }
51
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
189 }
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
190
318
9916350d7d8b don't fail fatally if the client can't get homedir from getpwuid(), fallback
Matt Johnston <matt@ucc.asn.au>
parents: 170
diff changeset
191 snprintf(filename, len+18, "%s/.ssh/known_hosts", homedir);
9916350d7d8b don't fail fatally if the client can't get homedir from getpwuid(), fallback
Matt Johnston <matt@ucc.asn.au>
parents: 170
diff changeset
192 hostsfile = fopen(filename, "a+");
9916350d7d8b don't fail fatally if the client can't get homedir from getpwuid(), fallback
Matt Johnston <matt@ucc.asn.au>
parents: 170
diff changeset
193
9916350d7d8b don't fail fatally if the client can't get homedir from getpwuid(), fallback
Matt Johnston <matt@ucc.asn.au>
parents: 170
diff changeset
194 if (hostsfile != NULL) {
436
7282370416a0 Improve known_hosts checking.
Matt Johnston <matt@ucc.asn.au>
parents: 418
diff changeset
195 *readonly = 0;
318
9916350d7d8b don't fail fatally if the client can't get homedir from getpwuid(), fallback
Matt Johnston <matt@ucc.asn.au>
parents: 170
diff changeset
196 fseek(hostsfile, 0, SEEK_SET);
9916350d7d8b don't fail fatally if the client can't get homedir from getpwuid(), fallback
Matt Johnston <matt@ucc.asn.au>
parents: 170
diff changeset
197 } else {
9916350d7d8b don't fail fatally if the client can't get homedir from getpwuid(), fallback
Matt Johnston <matt@ucc.asn.au>
parents: 170
diff changeset
198 /* We mightn't have been able to open it if it was read-only */
9916350d7d8b don't fail fatally if the client can't get homedir from getpwuid(), fallback
Matt Johnston <matt@ucc.asn.au>
parents: 170
diff changeset
199 if (errno == EACCES || errno == EROFS) {
9916350d7d8b don't fail fatally if the client can't get homedir from getpwuid(), fallback
Matt Johnston <matt@ucc.asn.au>
parents: 170
diff changeset
200 TRACE(("trying readonly: %s", strerror(errno)))
436
7282370416a0 Improve known_hosts checking.
Matt Johnston <matt@ucc.asn.au>
parents: 418
diff changeset
201 *readonly = 1;
318
9916350d7d8b don't fail fatally if the client can't get homedir from getpwuid(), fallback
Matt Johnston <matt@ucc.asn.au>
parents: 170
diff changeset
202 hostsfile = fopen(filename, "r");
9916350d7d8b don't fail fatally if the client can't get homedir from getpwuid(), fallback
Matt Johnston <matt@ucc.asn.au>
parents: 170
diff changeset
203 }
106
e13f8a712a1c Fix if the first write fails
Matt Johnston <matt@ucc.asn.au>
parents: 84
diff changeset
204 }
59
bdc97a5719f4 add new entries to known_hosts
Matt Johnston <matt@ucc.asn.au>
parents: 51
diff changeset
205 }
bdc97a5719f4 add new entries to known_hosts
Matt Johnston <matt@ucc.asn.au>
parents: 51
diff changeset
206
51
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
207 if (hostsfile == NULL) {
165
0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
Matt Johnston <matt@ucc.asn.au>
parents: 106
diff changeset
208 TRACE(("hostsfile didn't open: %s", strerror(errno)))
322
84aa4e60bd3c Look at HOME before /etc/passwd when looking for ~/.ssh/known_hosts
Matt Johnston <matt@ucc.asn.au>
parents: 318
diff changeset
209 dropbear_log(LOG_WARNING, "Failed to open %s/.ssh/known_hosts",
84aa4e60bd3c Look at HOME before /etc/passwd when looking for ~/.ssh/known_hosts
Matt Johnston <matt@ucc.asn.au>
parents: 318
diff changeset
210 homedir);
436
7282370416a0 Improve known_hosts checking.
Matt Johnston <matt@ucc.asn.au>
parents: 418
diff changeset
211 goto out;
7282370416a0 Improve known_hosts checking.
Matt Johnston <matt@ucc.asn.au>
parents: 418
diff changeset
212 }
7282370416a0 Improve known_hosts checking.
Matt Johnston <matt@ucc.asn.au>
parents: 418
diff changeset
213
7282370416a0 Improve known_hosts checking.
Matt Johnston <matt@ucc.asn.au>
parents: 418
diff changeset
214 out:
7282370416a0 Improve known_hosts checking.
Matt Johnston <matt@ucc.asn.au>
parents: 418
diff changeset
215 m_free(filename);
7282370416a0 Improve known_hosts checking.
Matt Johnston <matt@ucc.asn.au>
parents: 418
diff changeset
216 return hostsfile;
7282370416a0 Improve known_hosts checking.
Matt Johnston <matt@ucc.asn.au>
parents: 418
diff changeset
217 }
7282370416a0 Improve known_hosts checking.
Matt Johnston <matt@ucc.asn.au>
parents: 418
diff changeset
218
7282370416a0 Improve known_hosts checking.
Matt Johnston <matt@ucc.asn.au>
parents: 418
diff changeset
219 static void checkhostkey(unsigned char* keyblob, unsigned int keybloblen) {
7282370416a0 Improve known_hosts checking.
Matt Johnston <matt@ucc.asn.au>
parents: 418
diff changeset
220
7282370416a0 Improve known_hosts checking.
Matt Johnston <matt@ucc.asn.au>
parents: 418
diff changeset
221 FILE *hostsfile = NULL;
7282370416a0 Improve known_hosts checking.
Matt Johnston <matt@ucc.asn.au>
parents: 418
diff changeset
222 int readonly = 0;
7282370416a0 Improve known_hosts checking.
Matt Johnston <matt@ucc.asn.au>
parents: 418
diff changeset
223 unsigned int hostlen, algolen;
7282370416a0 Improve known_hosts checking.
Matt Johnston <matt@ucc.asn.au>
parents: 418
diff changeset
224 unsigned long len;
7282370416a0 Improve known_hosts checking.
Matt Johnston <matt@ucc.asn.au>
parents: 418
diff changeset
225 const char *algoname = NULL;
7282370416a0 Improve known_hosts checking.
Matt Johnston <matt@ucc.asn.au>
parents: 418
diff changeset
226 char * fingerprint = NULL;
7282370416a0 Improve known_hosts checking.
Matt Johnston <matt@ucc.asn.au>
parents: 418
diff changeset
227 buffer * line = NULL;
7282370416a0 Improve known_hosts checking.
Matt Johnston <matt@ucc.asn.au>
parents: 418
diff changeset
228 int ret;
7282370416a0 Improve known_hosts checking.
Matt Johnston <matt@ucc.asn.au>
parents: 418
diff changeset
229
7282370416a0 Improve known_hosts checking.
Matt Johnston <matt@ucc.asn.au>
parents: 418
diff changeset
230 hostsfile = open_known_hosts_file(&readonly);
7282370416a0 Improve known_hosts checking.
Matt Johnston <matt@ucc.asn.au>
parents: 418
diff changeset
231 if (!hostsfile) {
51
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
232 ask_to_confirm(keyblob, keybloblen);
436
7282370416a0 Improve known_hosts checking.
Matt Johnston <matt@ucc.asn.au>
parents: 418
diff changeset
233 /* ask_to_confirm will exit upon failure */
7282370416a0 Improve known_hosts checking.
Matt Johnston <matt@ucc.asn.au>
parents: 418
diff changeset
234 return;
51
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
235 }
436
7282370416a0 Improve known_hosts checking.
Matt Johnston <matt@ucc.asn.au>
parents: 418
diff changeset
236
51
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
237 line = buf_new(MAX_KNOWNHOSTS_LINE);
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
238 hostlen = strlen(cli_opts.remotehost);
59
bdc97a5719f4 add new entries to known_hosts
Matt Johnston <matt@ucc.asn.au>
parents: 51
diff changeset
239 algoname = signkey_name_from_type(ses.newkeys->algo_hostkey, &algolen);
51
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
240
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
241 do {
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
242 if (buf_getline(line, hostsfile) == DROPBEAR_FAILURE) {
165
0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
Matt Johnston <matt@ucc.asn.au>
parents: 106
diff changeset
243 TRACE(("failed reading line: prob EOF"))
51
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
244 break;
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
245 }
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
246
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
247 /* The line is too short to be sensible */
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
248 /* "30" is 'enough to hold ssh-dss plus the spaces, ie so we don't
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
249 * buf_getfoo() past the end and die horribly - the base64 parsing
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
250 * code is what tiptoes up to the end nicely */
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
251 if (line->len < (hostlen+30) ) {
165
0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
Matt Johnston <matt@ucc.asn.au>
parents: 106
diff changeset
252 TRACE(("line is too short to be sensible"))
51
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
253 continue;
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
254 }
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
255
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
256 /* Compare hostnames */
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
257 if (strncmp(cli_opts.remotehost, buf_getptr(line, hostlen),
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
258 hostlen) != 0) {
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
259 continue;
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
260 }
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
261
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
262 buf_incrpos(line, hostlen);
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
263 if (buf_getbyte(line) != ' ') {
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
264 /* there wasn't a space after the hostname, something dodgy */
165
0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
Matt Johnston <matt@ucc.asn.au>
parents: 106
diff changeset
265 TRACE(("missing space afte matching hostname"))
51
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
266 continue;
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
267 }
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
268
436
7282370416a0 Improve known_hosts checking.
Matt Johnston <matt@ucc.asn.au>
parents: 418
diff changeset
269 if (strncmp(buf_getptr(line, algolen), algoname, algolen) != 0) {
165
0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
Matt Johnston <matt@ucc.asn.au>
parents: 106
diff changeset
270 TRACE(("algo doesn't match"))
51
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
271 continue;
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
272 }
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
273
59
bdc97a5719f4 add new entries to known_hosts
Matt Johnston <matt@ucc.asn.au>
parents: 51
diff changeset
274 buf_incrpos(line, algolen);
51
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
275 if (buf_getbyte(line) != ' ') {
165
0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
Matt Johnston <matt@ucc.asn.au>
parents: 106
diff changeset
276 TRACE(("missing space after algo"))
51
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
277 continue;
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
278 }
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
279
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
280 /* Now we're at the interesting hostkey */
436
7282370416a0 Improve known_hosts checking.
Matt Johnston <matt@ucc.asn.au>
parents: 418
diff changeset
281 ret = cmp_base64_key(keyblob, keybloblen, algoname, algolen,
7282370416a0 Improve known_hosts checking.
Matt Johnston <matt@ucc.asn.au>
parents: 418
diff changeset
282 line, &fingerprint);
51
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
283
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
284 if (ret == DROPBEAR_SUCCESS) {
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
285 /* Good matching key */
165
0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
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parents: 106
diff changeset
286 TRACE(("good matching key"))
51
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
287 goto out;
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
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parents: 34
diff changeset
288 }
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
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parents: 34
diff changeset
289
436
7282370416a0 Improve known_hosts checking.
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parents: 418
diff changeset
290 /* The keys didn't match. eep. Note that we're "leaking"
7282370416a0 Improve known_hosts checking.
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parents: 418
diff changeset
291 the fingerprint strings here, but we're exiting anyway */
7282370416a0 Improve known_hosts checking.
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parents: 418
diff changeset
292 dropbear_exit("\n\nHost key mismatch for %s !\n"
7282370416a0 Improve known_hosts checking.
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parents: 418
diff changeset
293 "Fingerprint is %s\n"
7282370416a0 Improve known_hosts checking.
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parents: 418
diff changeset
294 "Expected %s\n"
7282370416a0 Improve known_hosts checking.
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parents: 418
diff changeset
295 "If you know that the host key is correct you can\nremove the bad entry from ~/.ssh/known_hosts",
7282370416a0 Improve known_hosts checking.
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parents: 418
diff changeset
296 cli_opts.remotehost,
7282370416a0 Improve known_hosts checking.
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parents: 418
diff changeset
297 sign_key_fingerprint(keyblob, keybloblen),
7282370416a0 Improve known_hosts checking.
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parents: 418
diff changeset
298 fingerprint ? fingerprint : "UNKNOWN");
51
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parents: 34
diff changeset
299 } while (1); /* keep going 'til something happens */
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parents: 34
diff changeset
300
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
301 /* Key doesn't exist yet */
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Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
302 ask_to_confirm(keyblob, keybloblen);
59
bdc97a5719f4 add new entries to known_hosts
Matt Johnston <matt@ucc.asn.au>
parents: 51
diff changeset
303
51
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Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
304 /* If we get here, they said yes */
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Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
305
59
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parents: 51
diff changeset
306 if (readonly) {
165
0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
Matt Johnston <matt@ucc.asn.au>
parents: 106
diff changeset
307 TRACE(("readonly"))
59
bdc97a5719f4 add new entries to known_hosts
Matt Johnston <matt@ucc.asn.au>
parents: 51
diff changeset
308 goto out;
bdc97a5719f4 add new entries to known_hosts
Matt Johnston <matt@ucc.asn.au>
parents: 51
diff changeset
309 }
bdc97a5719f4 add new entries to known_hosts
Matt Johnston <matt@ucc.asn.au>
parents: 51
diff changeset
310
418
ab57ba0cb667 Add '-y' option to dbclient to accept the host key without checking
Matt Johnston <matt@ucc.asn.au>
parents: 340
diff changeset
311 if (!cli_opts.always_accept_key) {
ab57ba0cb667 Add '-y' option to dbclient to accept the host key without checking
Matt Johnston <matt@ucc.asn.au>
parents: 340
diff changeset
312 /* put the new entry in the file */
ab57ba0cb667 Add '-y' option to dbclient to accept the host key without checking
Matt Johnston <matt@ucc.asn.au>
parents: 340
diff changeset
313 fseek(hostsfile, 0, SEEK_END); /* In case it wasn't opened append */
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Matt Johnston <matt@ucc.asn.au>
parents: 340
diff changeset
314 buf_setpos(line, 0);
ab57ba0cb667 Add '-y' option to dbclient to accept the host key without checking
Matt Johnston <matt@ucc.asn.au>
parents: 340
diff changeset
315 buf_setlen(line, 0);
568
005530560594 Rearrange getaddrstring() etc
Matt Johnston <matt@ucc.asn.au>
parents: 544
diff changeset
316 buf_putbytes(line, cli_opts.remotehost, hostlen);
418
ab57ba0cb667 Add '-y' option to dbclient to accept the host key without checking
Matt Johnston <matt@ucc.asn.au>
parents: 340
diff changeset
317 buf_putbyte(line, ' ');
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Matt Johnston <matt@ucc.asn.au>
parents: 340
diff changeset
318 buf_putbytes(line, algoname, algolen);
ab57ba0cb667 Add '-y' option to dbclient to accept the host key without checking
Matt Johnston <matt@ucc.asn.au>
parents: 340
diff changeset
319 buf_putbyte(line, ' ');
ab57ba0cb667 Add '-y' option to dbclient to accept the host key without checking
Matt Johnston <matt@ucc.asn.au>
parents: 340
diff changeset
320 len = line->size - line->pos;
ab57ba0cb667 Add '-y' option to dbclient to accept the host key without checking
Matt Johnston <matt@ucc.asn.au>
parents: 340
diff changeset
321 /* The only failure with base64 is buffer_overflow, but buf_getwriteptr
ab57ba0cb667 Add '-y' option to dbclient to accept the host key without checking
Matt Johnston <matt@ucc.asn.au>
parents: 340
diff changeset
322 * will die horribly in the case anyway */
ab57ba0cb667 Add '-y' option to dbclient to accept the host key without checking
Matt Johnston <matt@ucc.asn.au>
parents: 340
diff changeset
323 base64_encode(keyblob, keybloblen, buf_getwriteptr(line, len), &len);
ab57ba0cb667 Add '-y' option to dbclient to accept the host key without checking
Matt Johnston <matt@ucc.asn.au>
parents: 340
diff changeset
324 buf_incrwritepos(line, len);
ab57ba0cb667 Add '-y' option to dbclient to accept the host key without checking
Matt Johnston <matt@ucc.asn.au>
parents: 340
diff changeset
325 buf_putbyte(line, '\n');
ab57ba0cb667 Add '-y' option to dbclient to accept the host key without checking
Matt Johnston <matt@ucc.asn.au>
parents: 340
diff changeset
326 buf_setpos(line, 0);
ab57ba0cb667 Add '-y' option to dbclient to accept the host key without checking
Matt Johnston <matt@ucc.asn.au>
parents: 340
diff changeset
327 fwrite(buf_getptr(line, line->len), line->len, 1, hostsfile);
ab57ba0cb667 Add '-y' option to dbclient to accept the host key without checking
Matt Johnston <matt@ucc.asn.au>
parents: 340
diff changeset
328 /* We ignore errors, since there's not much we can do about them */
ab57ba0cb667 Add '-y' option to dbclient to accept the host key without checking
Matt Johnston <matt@ucc.asn.au>
parents: 340
diff changeset
329 }
59
bdc97a5719f4 add new entries to known_hosts
Matt Johnston <matt@ucc.asn.au>
parents: 51
diff changeset
330
51
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
331 out:
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
332 if (hostsfile != NULL) {
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
333 fclose(hostsfile);
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
334 }
79
5a55bd66707f - don't crash when trying to add to known_hosts if it doesn't exist
Matt Johnston <matt@ucc.asn.au>
parents: 74
diff changeset
335 if (line != NULL) {
5a55bd66707f - don't crash when trying to add to known_hosts if it doesn't exist
Matt Johnston <matt@ucc.asn.au>
parents: 74
diff changeset
336 buf_free(line);
5a55bd66707f - don't crash when trying to add to known_hosts if it doesn't exist
Matt Johnston <matt@ucc.asn.au>
parents: 74
diff changeset
337 }
544
9e51707cd6f2 - Make -i and -W pass through multihop arguments
Matt Johnston <matt@ucc.asn.au>
parents: 440
diff changeset
338 m_free(fingerprint);
51
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
339 }