Mercurial > dropbear

annotate svr-runopts.c @ 340:454a34b2dfd1

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Fixes from Erik Hovland: cli-authpubkey.c: fix leak of keybuf cli-kex.c: fix leak of fingerprint fp cli-service.c: remove commented out code dropbearkey.c: don't attepmt to free NULL key on failure common-kex.c: only free key if it is initialised keyimport.c: remove dead encrypted-key code don't leak a FILE* loading OpenSSH keys rsa.c, dss.c: check return values for some libtommath functions svr-kex.c: check return value retrieving DH kex mpint svr-tcpfwd.c: fix null-dereference if remote tcp forward request fails tcp-accept.c: don't incorrectly free the tcpinfo var
author Matt Johnston <matt@ucc.asn.au>
date Fri, 07 Jul 2006 09:17:18 +0000
parents 3bfbe95f9a14
children 337c45621e81
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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) 2002,2003 Matt Johnston
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5 * All rights reserved.
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6 *
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7 * Permission is hereby granted, free of charge, to any person obtaining a copy
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8 * of this software and associated documentation files (the "Software"), to deal
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9 * in the Software without restriction, including without limitation the rights
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10 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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11 * copies of the Software, and to permit persons to whom the Software is
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12 * furnished to do so, subject to the following conditions:
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13 *
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14 * The above copyright notice and this permission notice shall be included in
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15 * all copies or substantial portions of the Software.
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16 *
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17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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20 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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21 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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22 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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23 * SOFTWARE. */
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24
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25 #include "includes.h"
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26 #include "runopts.h"
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27 #include "signkey.h"
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28 #include "buffer.h"
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29 #include "dbutil.h"
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30 #include "algo.h"
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31
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32 svr_runopts svr_opts; /* GLOBAL */
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33
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34 static void printhelp(const char * progname);
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35
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36 static void printhelp(const char * progname) {
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37
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38 fprintf(stderr, "Dropbear sshd v%s\n"
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39 "Usage: %s [options]\n"
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40 "Options are:\n"
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41 "-b bannerfile Display the contents of bannerfile"
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42 " before user login\n"
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43 " (default: none)\n"
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44 #ifdef DROPBEAR_DSS
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45 "-d dsskeyfile Use dsskeyfile for the dss host key\n"
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46 " (default: %s)\n"
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47 #endif
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48 #ifdef DROPBEAR_RSA
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49 "-r rsakeyfile Use rsakeyfile for the rsa host key\n"
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50 " (default: %s)\n"
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51 #endif
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52 "-F Don't fork into background\n"
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53 #ifdef DISABLE_SYSLOG
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54 "(Syslog support not compiled in, using stderr)\n"
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55 #else
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56 "-E Log to stderr rather than syslog\n"
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57 #endif
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58 #ifdef DO_MOTD
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59 "-m Don't display the motd on login\n"
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60 #endif
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61 "-w Disallow root logins\n"
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62 #if defined(ENABLE_SVR_PASSWORD_AUTH) || defined(ENABLE_SVR_PAM_AUTH)
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63 "-s Disable password logins\n"
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64 "-g Disable password logins for root\n"
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65 #endif
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66 #ifdef ENABLE_SVR_LOCALTCPFWD
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67 "-j Disable local port forwarding\n"
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68 #endif
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69 #ifdef ENABLE_SVR_REMOTETCPFWD
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70 "-k Disable remote port forwarding\n"
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71 "-a Allow connections to forwarded ports from any host\n"
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72 #endif
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73 "-p port Listen on specified tcp port, up to %d can be specified\n"
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74 " (default %s if none specified)\n"
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75 "-P PidFile Create pid file PidFile\n"
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76 " (default %s)\n"
71
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77 #ifdef INETD_MODE
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78 "-i Start for inetd\n"
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79 #endif
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80 #ifdef DEBUG_TRACE
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81 "-v verbose\n"
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82 #endif
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83 ,DROPBEAR_VERSION, progname,
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84 #ifdef DROPBEAR_DSS
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85 DSS_PRIV_FILENAME,
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86 #endif
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87 #ifdef DROPBEAR_RSA
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88 RSA_PRIV_FILENAME,
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89 #endif
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90 DROPBEAR_MAX_PORTS, DROPBEAR_DEFPORT, DROPBEAR_PIDFILE);
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91 }
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92
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93 void svr_getopts(int argc, char ** argv) {
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94
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95 unsigned int i;
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96 char ** next = 0;
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97
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98 /* see printhelp() for options */
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99 svr_opts.rsakeyfile = NULL;
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100 svr_opts.dsskeyfile = NULL;
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101 svr_opts.bannerfile = NULL;
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102 svr_opts.banner = NULL;
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103 svr_opts.forkbg = 1;
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104 svr_opts.norootlogin = 0;
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105 svr_opts.noauthpass = 0;
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106 svr_opts.norootpass = 0;
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107 svr_opts.inetdmode = 0;
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108 svr_opts.portcount = 0;
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109 svr_opts.hostkey = NULL;
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110 svr_opts.pidfile = DROPBEAR_PIDFILE;
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111 #ifdef ENABLE_SVR_LOCALTCPFWD
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112 svr_opts.nolocaltcp = 0;
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113 #endif
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114 #ifdef ENABLE_SVR_REMOTETCPFWD
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115 svr_opts.noremotetcp = 0;
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116 #endif
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117 /* not yet
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118 opts.ipv4 = 1;
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119 opts.ipv6 = 1;
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120 */
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121 #ifdef DO_MOTD
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122 svr_opts.domotd = 1;
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123 #endif
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124 #ifndef DISABLE_SYSLOG
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125 svr_opts.usingsyslog = 1;
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126 #endif
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127 #ifdef ENABLE_SVR_REMOTETCPFWD
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128 opts.listen_fwd_all = 0;
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129 #endif
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130
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131 for (i = 1; i < (unsigned int)argc; i++) {
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132 if (next) {
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133 *next = argv[i];
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134 if (*next == NULL) {
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135 dropbear_exit("Invalid null argument");
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136 }
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137 next = 0x00;
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138 continue;
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139 }
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140
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141 if (argv[i][0] == '-') {
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142 switch (argv[i][1]) {
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143 case 'b':
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144 next = &svr_opts.bannerfile;
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145 break;
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diff changeset
146 #ifdef DROPBEAR_DSS
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diff changeset
147 case 'd':
24
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diff changeset
148 next = &svr_opts.dsskeyfile;
4
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diff changeset
149 break;
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diff changeset
150 #endif
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diff changeset
151 #ifdef DROPBEAR_RSA
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diff changeset
152 case 'r':
24
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parents: 4
diff changeset
153 next = &svr_opts.rsakeyfile;
4
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diff changeset
154 break;
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parents:
diff changeset
155 #endif
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diff changeset
156 case 'F':
24
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diff changeset
157 svr_opts.forkbg = 0;
4
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diff changeset
158 break;
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diff changeset
159 #ifndef DISABLE_SYSLOG
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diff changeset
160 case 'E':
24
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diff changeset
161 svr_opts.usingsyslog = 0;
4
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diff changeset
162 break;
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diff changeset
163 #endif
271
be18c7dd486e Fix up #ifdefs for tcp forwarding
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parents: 258
diff changeset
164 #ifdef ENABLE_SVR_LOCALTCPFWD
4
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165 case 'j':
258
306499676384 * add -g (dbclient) and -a (dropbear) options for allowing non-local
Matt Johnston <matt@ucc.asn.au>
parents: 165
diff changeset
166 svr_opts.nolocaltcp = 1;
4
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167 break;
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diff changeset
168 #endif
271
be18c7dd486e Fix up #ifdefs for tcp forwarding
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diff changeset
169 #ifdef ENABLE_SVR_REMOTETCPFWD
4
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170 case 'k':
258
306499676384 * add -g (dbclient) and -a (dropbear) options for allowing non-local
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parents: 165
diff changeset
171 svr_opts.noremotetcp = 1;
306499676384 * add -g (dbclient) and -a (dropbear) options for allowing non-local
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parents: 165
diff changeset
172 break;
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parents: 165
diff changeset
173 case 'a':
306499676384 * add -g (dbclient) and -a (dropbear) options for allowing non-local
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diff changeset
174 opts.listen_fwd_all = 1;
4
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175 break;
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176 #endif
71
ac96bc733e71 adding inetd mode back from 0.43
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parents: 68
diff changeset
177 #ifdef INETD_MODE
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178 case 'i':
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diff changeset
179 svr_opts.inetdmode = 1;
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diff changeset
180 break;
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diff changeset
181 #endif
4
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182 case 'p':
101
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diff changeset
183 if (svr_opts.portcount < DROPBEAR_MAX_PORTS) {
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parents: 94
diff changeset
184 svr_opts.ports[svr_opts.portcount] = NULL;
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diff changeset
185 next = &svr_opts.ports[svr_opts.portcount];
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parents: 94
diff changeset
186 /* Note: if it doesn't actually get set, we'll
72dc22f56858 Change the way we load keys/ports so we don't print error messages into our
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diff changeset
187 * decrement it after the loop */
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diff changeset
188 svr_opts.portcount++;
4
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189 }
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diff changeset
190 break;
323
3bfbe95f9a14 Add -P pidfile patch from Swen Schillig
Matt Johnston <matt@ucc.asn.au>
parents: 271
diff changeset
191 case 'P':
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parents: 271
diff changeset
192 next = &svr_opts.pidfile;
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parents: 271
diff changeset
193 break;
4
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194 #ifdef DO_MOTD
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195 /* motd is displayed by default, -m turns it off */
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196 case 'm':
24
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diff changeset
197 svr_opts.domotd = 0;
4
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198 break;
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diff changeset
199 #endif
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diff changeset
200 case 'w':
24
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parents: 4
diff changeset
201 svr_opts.norootlogin = 1;
4
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diff changeset
202 break;
121
9337c9f9a607 PAM improvements
Matt Johnston <matt@ucc.asn.au>
parents: 104
diff changeset
203 #if defined(ENABLE_SVR_PASSWORD_AUTH) || defined(ENABLE_SVR_PAM_AUTH)
4
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diff changeset
204 case 's':
24
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parents: 4
diff changeset
205 svr_opts.noauthpass = 1;
4
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diff changeset
206 break;
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diff changeset
207 case 'g':
24
469950e86d0f switching to global vars
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diff changeset
208 svr_opts.norootpass = 1;
4
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diff changeset
209 break;
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parents:
diff changeset
210 #endif
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parents:
diff changeset
211 case 'h':
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parents:
diff changeset
212 printhelp(argv[0]);
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diff changeset
213 exit(EXIT_FAILURE);
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diff changeset
214 break;
94
c85c88500ea6 DEBUG_TRACE now only triggers with -v on the cmdline
Matt Johnston <matt@ucc.asn.au>
parents: 91
diff changeset
215 #ifdef DEBUG_TRACE
c85c88500ea6 DEBUG_TRACE now only triggers with -v on the cmdline
Matt Johnston <matt@ucc.asn.au>
parents: 91
diff changeset
216 case 'v':
c85c88500ea6 DEBUG_TRACE now only triggers with -v on the cmdline
Matt Johnston <matt@ucc.asn.au>
parents: 91
diff changeset
217 debug_trace = 1;
c85c88500ea6 DEBUG_TRACE now only triggers with -v on the cmdline
Matt Johnston <matt@ucc.asn.au>
parents: 91
diff changeset
218 break;
c85c88500ea6 DEBUG_TRACE now only triggers with -v on the cmdline
Matt Johnston <matt@ucc.asn.au>
parents: 91
diff changeset
219 #endif
4
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diff changeset
220 default:
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parents:
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221 fprintf(stderr, "Unknown argument %s\n", argv[i]);
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diff changeset
222 printhelp(argv[0]);
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parents:
diff changeset
223 exit(EXIT_FAILURE);
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parents:
diff changeset
224 break;
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parents:
diff changeset
225 }
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parents:
diff changeset
226 }
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parents:
diff changeset
227 }
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diff changeset
228
101
72dc22f56858 Change the way we load keys/ports so we don't print error messages into our
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parents: 94
diff changeset
229 /* Set up listening ports */
72dc22f56858 Change the way we load keys/ports so we don't print error messages into our
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parents: 94
diff changeset
230 if (svr_opts.portcount == 0) {
72dc22f56858 Change the way we load keys/ports so we don't print error messages into our
Matt Johnston <matt@ucc.asn.au>
parents: 94
diff changeset
231 svr_opts.ports[0] = m_strdup(DROPBEAR_DEFPORT);
72dc22f56858 Change the way we load keys/ports so we don't print error messages into our
Matt Johnston <matt@ucc.asn.au>
parents: 94
diff changeset
232 svr_opts.portcount = 1;
72dc22f56858 Change the way we load keys/ports so we don't print error messages into our
Matt Johnston <matt@ucc.asn.au>
parents: 94
diff changeset
233 } else {
72dc22f56858 Change the way we load keys/ports so we don't print error messages into our
Matt Johnston <matt@ucc.asn.au>
parents: 94
diff changeset
234 /* we may have been given a -p option but no argument to go with
72dc22f56858 Change the way we load keys/ports so we don't print error messages into our
Matt Johnston <matt@ucc.asn.au>
parents: 94
diff changeset
235 * it */
72dc22f56858 Change the way we load keys/ports so we don't print error messages into our
Matt Johnston <matt@ucc.asn.au>
parents: 94
diff changeset
236 if (svr_opts.ports[svr_opts.portcount-1] == NULL) {
72dc22f56858 Change the way we load keys/ports so we don't print error messages into our
Matt Johnston <matt@ucc.asn.au>
parents: 94
diff changeset
237 svr_opts.portcount--;
72dc22f56858 Change the way we load keys/ports so we don't print error messages into our
Matt Johnston <matt@ucc.asn.au>
parents: 94
diff changeset
238 }
72dc22f56858 Change the way we load keys/ports so we don't print error messages into our
Matt Johnston <matt@ucc.asn.au>
parents: 94
diff changeset
239 }
72dc22f56858 Change the way we load keys/ports so we don't print error messages into our
Matt Johnston <matt@ucc.asn.au>
parents: 94
diff changeset
240
24
469950e86d0f switching to global vars
Matt Johnston <matt@ucc.asn.au>
parents: 4
diff changeset
241 if (svr_opts.dsskeyfile == NULL) {
469950e86d0f switching to global vars
Matt Johnston <matt@ucc.asn.au>
parents: 4
diff changeset
242 svr_opts.dsskeyfile = DSS_PRIV_FILENAME;
4
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parents:
diff changeset
243 }
24
469950e86d0f switching to global vars
Matt Johnston <matt@ucc.asn.au>
parents: 4
diff changeset
244 if (svr_opts.rsakeyfile == NULL) {
469950e86d0f switching to global vars
Matt Johnston <matt@ucc.asn.au>
parents: 4
diff changeset
245 svr_opts.rsakeyfile = RSA_PRIV_FILENAME;
4
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parents:
diff changeset
246 }
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parents:
diff changeset
247
24
469950e86d0f switching to global vars
Matt Johnston <matt@ucc.asn.au>
parents: 4
diff changeset
248 if (svr_opts.bannerfile) {
4
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parents:
diff changeset
249 struct stat buf;
24
469950e86d0f switching to global vars
Matt Johnston <matt@ucc.asn.au>
parents: 4
diff changeset
250 if (stat(svr_opts.bannerfile, &buf) != 0) {
4
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parents:
diff changeset
251 dropbear_exit("Error opening banner file '%s'",
24
469950e86d0f switching to global vars
Matt Johnston <matt@ucc.asn.au>
parents: 4
diff changeset
252 svr_opts.bannerfile);
4
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parents:
diff changeset
253 }
fe6bca95afa7 Makefile.in contains updated files required
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parents:
diff changeset
254
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
255 if (buf.st_size > MAX_BANNER_SIZE) {
fe6bca95afa7 Makefile.in contains updated files required
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parents:
diff changeset
256 dropbear_exit("Banner file too large, max is %d bytes",
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
257 MAX_BANNER_SIZE);
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parents:
diff changeset
258 }
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parents:
diff changeset
259
24
469950e86d0f switching to global vars
Matt Johnston <matt@ucc.asn.au>
parents: 4
diff changeset
260 svr_opts.banner = buf_new(buf.st_size);
469950e86d0f switching to global vars
Matt Johnston <matt@ucc.asn.au>
parents: 4
diff changeset
261 if (buf_readfile(svr_opts.banner, svr_opts.bannerfile)!=DROPBEAR_SUCCESS) {
4
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parents:
diff changeset
262 dropbear_exit("Error reading banner file '%s'",
24
469950e86d0f switching to global vars
Matt Johnston <matt@ucc.asn.au>
parents: 4
diff changeset
263 svr_opts.bannerfile);
4
fe6bca95afa7 Makefile.in contains updated files required
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parents:
diff changeset
264 }
24
469950e86d0f switching to global vars
Matt Johnston <matt@ucc.asn.au>
parents: 4
diff changeset
265 buf_setpos(svr_opts.banner, 0);
4
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
266 }
fe6bca95afa7 Makefile.in contains updated files required
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parents:
diff changeset
267
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
268 }
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parents:
diff changeset
269
47
4b53a43f0082 - client pubkey auth works
Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
270 static void disablekey(int type, const char* filename) {
4
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parents:
diff changeset
271
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parents:
diff changeset
272 int i;
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parents:
diff changeset
273
47
4b53a43f0082 - client pubkey auth works
Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
274 for (i = 0; sshhostkey[i].name != NULL; i++) {
4b53a43f0082 - client pubkey auth works
Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
275 if (sshhostkey[i].val == type) {
4b53a43f0082 - client pubkey auth works
Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
276 sshhostkey[i].usable = 0;
4b53a43f0082 - client pubkey auth works
Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
277 break;
4b53a43f0082 - client pubkey auth works
Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
278 }
4
fe6bca95afa7 Makefile.in contains updated files required
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parents:
diff changeset
279 }
101
72dc22f56858 Change the way we load keys/ports so we don't print error messages into our
Matt Johnston <matt@ucc.asn.au>
parents: 94
diff changeset
280 dropbear_log(LOG_WARNING, "Failed reading '%s', disabling %s", filename,
47
4b53a43f0082 - client pubkey auth works
Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
281 type == DROPBEAR_SIGNKEY_DSS ? "DSS" : "RSA");
4
fe6bca95afa7 Makefile.in contains updated files required
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parents:
diff changeset
282 }
fe6bca95afa7 Makefile.in contains updated files required
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parents:
diff changeset
283
101
72dc22f56858 Change the way we load keys/ports so we don't print error messages into our
Matt Johnston <matt@ucc.asn.au>
parents: 94
diff changeset
284 /* Must be called after syslog/etc is working */
72dc22f56858 Change the way we load keys/ports so we don't print error messages into our
Matt Johnston <matt@ucc.asn.au>
parents: 94
diff changeset
285 void loadhostkeys() {
4
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parents:
diff changeset
286
47
4b53a43f0082 - client pubkey auth works
Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
287 int ret;
4b53a43f0082 - client pubkey auth works
Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
288 int type;
4
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parents:
diff changeset
289
165
0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
Matt Johnston <matt@ucc.asn.au>
parents: 121
diff changeset
290 TRACE(("enter loadhostkeys"))
4
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parents:
diff changeset
291
101
72dc22f56858 Change the way we load keys/ports so we don't print error messages into our
Matt Johnston <matt@ucc.asn.au>
parents: 94
diff changeset
292 svr_opts.hostkey = new_sign_key();
4
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parents:
diff changeset
293
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
294 #ifdef DROPBEAR_RSA
47
4b53a43f0082 - client pubkey auth works
Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
295 type = DROPBEAR_SIGNKEY_RSA;
101
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296 ret = readhostkey(svr_opts.rsakeyfile, svr_opts.hostkey, &type);
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297 if (ret == DROPBEAR_FAILURE) {
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298 disablekey(DROPBEAR_SIGNKEY_RSA, svr_opts.rsakeyfile);
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299 }
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300 #endif
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301 #ifdef DROPBEAR_DSS
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302 type = DROPBEAR_SIGNKEY_DSS;
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303 ret = readhostkey(svr_opts.dsskeyfile, svr_opts.hostkey, &type);
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304 if (ret == DROPBEAR_FAILURE) {
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305 disablekey(DROPBEAR_SIGNKEY_DSS, svr_opts.dsskeyfile);
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306 }
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307 #endif
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308
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309 if ( 1
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310 #ifdef DROPBEAR_DSS
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311 && svr_opts.hostkey->dsskey == NULL
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312 #endif
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313 #ifdef DROPBEAR_RSA
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314 && svr_opts.hostkey->rsakey == NULL
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315 #endif
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316 ) {
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317 dropbear_exit("No hostkeys available");
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318 }
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319
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320 TRACE(("leave loadhostkeys"))
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321 }