Mercurial > dropbear

annotate cli-kex.c @ 342:3e098639b05f

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From Erik Hovland - Check for valid cipher independently to starting encryption - Use failure-checking m_mp_init for initialising mpint value
author Matt Johnston <matt@ucc.asn.au>
date Fri, 07 Jul 2006 09:28:32 +0000
parents 454a34b2dfd1
children ab57ba0cb667
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1 /*
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2 * Dropbear - a SSH2 server
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3 *
74
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4 * Copyright (c) 2002-2004 Matt Johnston
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5 * 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 "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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40
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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
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46 cli_ses.dh_e = (mp_int*)m_malloc(sizeof(mp_int));
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47 cli_ses.dh_x = (mp_int*)m_malloc(sizeof(mp_int));
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48 m_mp_init_multi(cli_ses.dh_e, cli_ses.dh_x, NULL);
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49
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50 gen_kexdh_vals(cli_ses.dh_e, cli_ses.dh_x);
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51
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52 CHECKCLEARTOWRITE();
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53 buf_putbyte(ses.writepayload, SSH_MSG_KEXDH_INIT);
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54 buf_putmpint(ses.writepayload, cli_ses.dh_e);
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55 encrypt_packet();
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56 ses.requirenext = SSH_MSG_KEXDH_REPLY;
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57 }
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58
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59 /* Handle a diffie-hellman key exchange reply. */
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60 void recv_msg_kexdh_reply() {
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61
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62 DEF_MP_INT(dh_f);
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63 sign_key *hostkey = NULL;
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64 unsigned int type, keybloblen;
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65 unsigned char* keyblob = NULL;
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66
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68 TRACE(("enter recv_msg_kexdh_reply"))
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69
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70 if (cli_ses.kex_state != KEXDH_INIT_SENT) {
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71 dropbear_exit("Received out-of-order kexdhreply");
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72 }
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73 m_mp_init(&dh_f);
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74 type = ses.newkeys->algo_hostkey;
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75 TRACE(("type is %d", type))
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77 hostkey = new_sign_key();
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78 keybloblen = buf_getint(ses.payload);
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80 keyblob = buf_getptr(ses.payload, keybloblen);
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81 if (!ses.kexstate.donefirstkex) {
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82 /* Only makes sense the first time */
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83 checkhostkey(keyblob, keybloblen);
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84 }
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85
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86 if (buf_get_pub_key(ses.payload, hostkey, &type) != DROPBEAR_SUCCESS) {
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87 TRACE(("failed getting pubkey"))
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88 dropbear_exit("Bad KEX packet");
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89 }
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90
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91 if (buf_getmpint(ses.payload, &dh_f) != DROPBEAR_SUCCESS) {
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92 TRACE(("failed getting mpint"))
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93 dropbear_exit("Bad KEX packet");
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94 }
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95
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96 kexdh_comb_key(cli_ses.dh_e, cli_ses.dh_x, &dh_f, hostkey);
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97 mp_clear(&dh_f);
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98 mp_clear_multi(cli_ses.dh_e, cli_ses.dh_x, NULL);
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99 m_free(cli_ses.dh_e);
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100 m_free(cli_ses.dh_x);
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101
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102 if (buf_verify(ses.payload, hostkey, ses.hash, SHA1_HASH_SIZE)
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103 != DROPBEAR_SUCCESS) {
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104 dropbear_exit("Bad hostkey signature");
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105 }
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106
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107 sign_key_free(hostkey);
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108 hostkey = NULL;
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109
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110 send_msg_newkeys();
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111 ses.requirenext = SSH_MSG_NEWKEYS;
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112 TRACE(("leave recv_msg_kexdh_init"))
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113 }
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114
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115 static void ask_to_confirm(unsigned char* keyblob, unsigned int keybloblen) {
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116
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117 char* fp = NULL;
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118 FILE *tty = NULL;
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119 char response = 'z';
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120
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121 fp = sign_key_fingerprint(keyblob, keybloblen);
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122 fprintf(stderr, "\nHost '%s' is not in the trusted hosts file.\n(fingerprint %s)\nDo you want to continue connecting? (y/n)\n",
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123 cli_opts.remotehost,
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124 fp);
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125 m_free(fp);
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126
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127 tty = fopen(_PATH_TTY, "r");
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128 if (tty) {
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129 response = getc(tty);
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130 fclose(tty);
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131 } else {
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132 response = getc(stdin);
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133 }
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134
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135 if (response == 'y') {
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136 return;
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137 }
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138
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139 dropbear_exit("Didn't validate host key");
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140 }
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141
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142 static void checkhostkey(unsigned char* keyblob, unsigned int keybloblen) {
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143
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144 char * filename = NULL;
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145 FILE *hostsfile = NULL;
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146 int readonly = 0;
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147 struct passwd *pw = NULL;
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148 char * homedir = NULL;
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149 unsigned int hostlen, algolen;
bdc97a5719f4 add new entries to known_hosts
Matt Johnston <matt@ucc.asn.au>
parents: 51
diff changeset
150 unsigned long len;
51
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
151 const char *algoname = NULL;
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
152 buffer * line = NULL;
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
153 int ret;
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
154
322
84aa4e60bd3c Look at HOME before /etc/passwd when looking for ~/.ssh/known_hosts
Matt Johnston <matt@ucc.asn.au>
parents: 318
diff changeset
155 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
156
322
84aa4e60bd3c Look at HOME before /etc/passwd when looking for ~/.ssh/known_hosts
Matt Johnston <matt@ucc.asn.au>
parents: 318
diff changeset
157 if (!homedir) {
84aa4e60bd3c Look at HOME before /etc/passwd when looking for ~/.ssh/known_hosts
Matt Johnston <matt@ucc.asn.au>
parents: 318
diff changeset
158 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
159 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
160 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
161 }
84aa4e60bd3c Look at HOME before /etc/passwd when looking for ~/.ssh/known_hosts
Matt Johnston <matt@ucc.asn.au>
parents: 318
diff changeset
162 pw = NULL;
51
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
163 }
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
164
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
165 if (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
166
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
167 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
168 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
169
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
170 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
171 /* 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
172 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
173 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
174 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
175 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
176 TRACE(("mkdir didn't work: %s", strerror(errno)))
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 ask_to_confirm(keyblob, keybloblen);
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 goto out; /* only get here on success */
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
179 }
51
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
180 }
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
181
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
182 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
183 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
184
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
185 if (hostsfile != NULL) {
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 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
187 } 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
188 /* 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
189 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
190 TRACE(("trying readonly: %s", strerror(errno)))
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 readonly = 1;
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, "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
193 }
106
e13f8a712a1c Fix if the first write fails
Matt Johnston <matt@ucc.asn.au>
parents: 84
diff changeset
194 }
59
bdc97a5719f4 add new entries to known_hosts
Matt Johnston <matt@ucc.asn.au>
parents: 51
diff changeset
195 }
bdc97a5719f4 add new entries to known_hosts
Matt Johnston <matt@ucc.asn.au>
parents: 51
diff changeset
196
51
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
197 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
198 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
199 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
200 homedir);
51
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
201 ask_to_confirm(keyblob, keybloblen);
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
202 goto out; /* We only get here on success */
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
203 }
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
204
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
205 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
206 hostlen = strlen(cli_opts.remotehost);
59
bdc97a5719f4 add new entries to known_hosts
Matt Johnston <matt@ucc.asn.au>
parents: 51
diff changeset
207 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
208
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
209 do {
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
210 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
211 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
212 break;
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
213 }
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
214
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
215 /* 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
216 /* "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
217 * 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
218 * 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
219 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
220 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
221 continue;
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
222 }
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
223
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
224 /* Compare hostnames */
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
225 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
226 hostlen) != 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
227 TRACE(("hosts don't match"))
51
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
228 continue;
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
229 }
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
230
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
231 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
232 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
233 /* 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
234 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
235 continue;
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
236 }
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
237
59
bdc97a5719f4 add new entries to known_hosts
Matt Johnston <matt@ucc.asn.au>
parents: 51
diff changeset
238 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
239 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
240 continue;
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
241 }
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
242
59
bdc97a5719f4 add new entries to known_hosts
Matt Johnston <matt@ucc.asn.au>
parents: 51
diff changeset
243 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
244 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
245 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
246 continue;
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
247 }
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
248
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
249 /* Now we're at the interesting hostkey */
59
bdc97a5719f4 add new entries to known_hosts
Matt Johnston <matt@ucc.asn.au>
parents: 51
diff changeset
250 ret = cmp_base64_key(keyblob, keybloblen, algoname, algolen, line);
51
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
251
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
252 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
253 /* Good matching key */
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
254 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
255 goto out;
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
256 }
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
257
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
258 /* The keys didn't match. eep. */
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
259 } while (1); /* keep going 'til something happens */
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 /* Key doesn't exist yet */
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
262 ask_to_confirm(keyblob, keybloblen);
59
bdc97a5719f4 add new entries to known_hosts
Matt Johnston <matt@ucc.asn.au>
parents: 51
diff changeset
263
51
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
264 /* If we get here, they said yes */
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
265
59
bdc97a5719f4 add new entries to known_hosts
Matt Johnston <matt@ucc.asn.au>
parents: 51
diff changeset
266 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
267 TRACE(("readonly"))
59
bdc97a5719f4 add new entries to known_hosts
Matt Johnston <matt@ucc.asn.au>
parents: 51
diff changeset
268 goto out;
bdc97a5719f4 add new entries to known_hosts
Matt Johnston <matt@ucc.asn.au>
parents: 51
diff changeset
269 }
bdc97a5719f4 add new entries to known_hosts
Matt Johnston <matt@ucc.asn.au>
parents: 51
diff changeset
270
bdc97a5719f4 add new entries to known_hosts
Matt Johnston <matt@ucc.asn.au>
parents: 51
diff changeset
271 /* put the new entry in the file */
80
07bcdccb3577 create known_hosts properly
Matt Johnston <matt@ucc.asn.au>
parents: 79
diff changeset
272 fseek(hostsfile, 0, SEEK_END); /* In case it wasn't opened append */
59
bdc97a5719f4 add new entries to known_hosts
Matt Johnston <matt@ucc.asn.au>
parents: 51
diff changeset
273 buf_setpos(line, 0);
bdc97a5719f4 add new entries to known_hosts
Matt Johnston <matt@ucc.asn.au>
parents: 51
diff changeset
274 buf_setlen(line, 0);
bdc97a5719f4 add new entries to known_hosts
Matt Johnston <matt@ucc.asn.au>
parents: 51
diff changeset
275 buf_putbytes(line, ses.remotehost, hostlen);
bdc97a5719f4 add new entries to known_hosts
Matt Johnston <matt@ucc.asn.au>
parents: 51
diff changeset
276 buf_putbyte(line, ' ');
bdc97a5719f4 add new entries to known_hosts
Matt Johnston <matt@ucc.asn.au>
parents: 51
diff changeset
277 buf_putbytes(line, algoname, algolen);
bdc97a5719f4 add new entries to known_hosts
Matt Johnston <matt@ucc.asn.au>
parents: 51
diff changeset
278 buf_putbyte(line, ' ');
bdc97a5719f4 add new entries to known_hosts
Matt Johnston <matt@ucc.asn.au>
parents: 51
diff changeset
279 len = line->size - line->pos;
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
280 TRACE(("keybloblen %d, len %d", keybloblen, len))
59
bdc97a5719f4 add new entries to known_hosts
Matt Johnston <matt@ucc.asn.au>
parents: 51
diff changeset
281 /* The only failure with base64 is buffer_overflow, but buf_getwriteptr
bdc97a5719f4 add new entries to known_hosts
Matt Johnston <matt@ucc.asn.au>
parents: 51
diff changeset
282 * will die horribly in the case anyway */
bdc97a5719f4 add new entries to known_hosts
Matt Johnston <matt@ucc.asn.au>
parents: 51
diff changeset
283 base64_encode(keyblob, keybloblen, buf_getwriteptr(line, len), &len);
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284 buf_incrwritepos(line, len);
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285 buf_putbyte(line, '\n');
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286 buf_setpos(line, 0);
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287 fwrite(buf_getptr(line, line->len), line->len, 1, hostsfile);
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288 /* We ignore errors, since there's not much we can do about them */
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289
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290 out:
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291 if (hostsfile != NULL) {
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292 fclose(hostsfile);
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293 }
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294 m_free(filename);
79
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295 if (line != NULL) {
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296 buf_free(line);
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297 }
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298 }