Mercurial > dropbear

annotate svr-runopts.c @ 63:dcc43965928f

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- A nice cleaner structure for tcp (acceptor) forwarding. - still a checkpoint-ish commit - sorted out listening on localhost only
author Matt Johnston <matt@ucc.asn.au>
date Wed, 11 Aug 2004 17:26:47 +0000
parents 4b53a43f0082
children eee77ac31ccc
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
4
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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 sign_key * loadhostkeys(const char * dsskeyfile,
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35 const char * rsakeyfile);
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36 static void printhelp(const char * progname);
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37
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38 static void printhelp(const char * progname) {
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39
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40 fprintf(stderr, "Dropbear sshd v%s\n"
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41 "Usage: %s [options]\n"
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42 "Options are:\n"
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43 "-b bannerfile Display the contents of bannerfile"
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44 " before user login\n"
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45 " (default: none)\n"
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46 #ifdef DROPBEAR_DSS
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47 "-d dsskeyfile Use dsskeyfile for the dss host key\n"
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48 " (default: %s)\n"
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49 #endif
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50 #ifdef DROPBEAR_RSA
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51 "-r rsakeyfile Use rsakeyfile for the rsa host key\n"
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52 " (default: %s)\n"
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53 #endif
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54 "-F Don't fork into background\n"
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55 #ifdef DISABLE_SYSLOG
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56 "(Syslog support not compiled in, using stderr)\n"
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57 #else
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58 "-E Log to stderr rather than syslog\n"
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59 #endif
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60 #ifdef DO_MOTD
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61 "-m Don't display the motd on login\n"
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62 #endif
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63 "-w Disallow root logins\n"
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64 #ifdef DROPBEAR_PASSWORD_AUTH
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65 "-s Disable password logins\n"
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66 "-g Disable password logins for root\n"
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67 #endif
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68 #ifndef DISABLE_LOCALTCPFWD
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69 "-j Disable local port forwarding\n"
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70 #endif
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71 #ifndef DISABLE_REMOTETCPFWD
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72 "-k Disable remote port forwarding\n"
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73 #endif
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74 "-p port Listen on specified tcp port, up to %d can be specified\n"
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75 " (default %d if none specified)\n"
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76 /* "-4/-6 Disable listening on ipv4/ipv6 respectively\n"*/
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78 ,DROPBEAR_VERSION, progname,
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79 #ifdef DROPBEAR_DSS
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80 DSS_PRIV_FILENAME,
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81 #endif
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82 #ifdef DROPBEAR_RSA
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83 RSA_PRIV_FILENAME,
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84 #endif
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85 DROPBEAR_MAX_PORTS, DROPBEAR_PORT);
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86 }
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87
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88 void svr_getopts(int argc, char ** argv) {
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89
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90 unsigned int i;
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91 char ** next = 0;
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92 unsigned int portnum = 0;
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93 char *portstring[DROPBEAR_MAX_PORTS];
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94 unsigned int longport;
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95
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96 /* see printhelp() for options */
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97 svr_opts.rsakeyfile = NULL;
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98 svr_opts.dsskeyfile = NULL;
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99 svr_opts.bannerfile = NULL;
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100 svr_opts.banner = NULL;
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101 svr_opts.forkbg = 1;
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102 svr_opts.norootlogin = 0;
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103 svr_opts.noauthpass = 0;
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104 svr_opts.norootpass = 0;
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105 opts.nolocaltcp = 0;
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106 opts.noremotetcp = 0;
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107 /* not yet
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108 opts.ipv4 = 1;
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109 opts.ipv6 = 1;
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110 */
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111 #ifdef DO_MOTD
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112 svr_opts.domotd = 1;
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113 #endif
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114 #ifndef DISABLE_SYSLOG
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115 svr_opts.usingsyslog = 1;
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116 #endif
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117
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118 for (i = 1; i < (unsigned int)argc; i++) {
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119 if (next) {
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120 *next = argv[i];
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121 if (*next == NULL) {
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122 dropbear_exit("Invalid null argument");
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123 }
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124 next = 0x00;
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125 continue;
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126 }
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127
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128 if (argv[i][0] == '-') {
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129 switch (argv[i][1]) {
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130 case 'b':
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131 next = &svr_opts.bannerfile;
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132 break;
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133 #ifdef DROPBEAR_DSS
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134 case 'd':
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135 next = &svr_opts.dsskeyfile;
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136 break;
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137 #endif
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138 #ifdef DROPBEAR_RSA
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139 case 'r':
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140 next = &svr_opts.rsakeyfile;
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141 break;
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142 #endif
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143 case 'F':
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144 svr_opts.forkbg = 0;
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145 break;
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146 #ifndef DISABLE_SYSLOG
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147 case 'E':
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148 svr_opts.usingsyslog = 0;
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149 break;
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150 #endif
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151 #ifndef DISABLE_LOCALTCPFWD
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152 case 'j':
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153 opts.nolocaltcp = 1;
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154 break;
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155 #endif
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156 #ifndef DISABLE_REMOTETCPFWD
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157 case 'k':
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158 opts.noremotetcp = 1;
4
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159 break;
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160 #endif
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161 case 'p':
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162 if (portnum < DROPBEAR_MAX_PORTS) {
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163 portstring[portnum] = NULL;
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164 next = &portstring[portnum];
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165 portnum++;
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166 }
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167 break;
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168 #ifdef DO_MOTD
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169 /* motd is displayed by default, -m turns it off */
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170 case 'm':
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diff changeset
171 svr_opts.domotd = 0;
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172 break;
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173 #endif
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174 case 'w':
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175 svr_opts.norootlogin = 1;
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176 break;
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177 #ifdef DROPBEAR_PASSWORD_AUTH
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178 case 's':
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179 svr_opts.noauthpass = 1;
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180 break;
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181 case 'g':
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182 svr_opts.norootpass = 1;
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183 break;
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184 #endif
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185 case 'h':
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186 printhelp(argv[0]);
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187 exit(EXIT_FAILURE);
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188 break;
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189 /*
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190 case '4':
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diff changeset
191 svr_opts.ipv4 = 0;
4
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192 break;
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193 case '6':
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194 svr_opts.ipv6 = 0;
4
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195 break;
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196 */
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197 default:
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198 fprintf(stderr, "Unknown argument %s\n", argv[i]);
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199 printhelp(argv[0]);
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200 exit(EXIT_FAILURE);
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201 break;
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202 }
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203 }
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204 }
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205
24
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diff changeset
206 if (svr_opts.dsskeyfile == NULL) {
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diff changeset
207 svr_opts.dsskeyfile = DSS_PRIV_FILENAME;
4
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208 }
24
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diff changeset
209 if (svr_opts.rsakeyfile == NULL) {
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diff changeset
210 svr_opts.rsakeyfile = RSA_PRIV_FILENAME;
4
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211 }
24
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diff changeset
212 svr_opts.hostkey = loadhostkeys(svr_opts.dsskeyfile, svr_opts.rsakeyfile);
4
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213
24
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diff changeset
214 if (svr_opts.bannerfile) {
4
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diff changeset
215 struct stat buf;
24
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diff changeset
216 if (stat(svr_opts.bannerfile, &buf) != 0) {
4
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217 dropbear_exit("Error opening banner file '%s'",
24
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diff changeset
218 svr_opts.bannerfile);
4
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219 }
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220
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221 if (buf.st_size > MAX_BANNER_SIZE) {
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222 dropbear_exit("Banner file too large, max is %d bytes",
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diff changeset
223 MAX_BANNER_SIZE);
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224 }
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diff changeset
225
24
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diff changeset
226 svr_opts.banner = buf_new(buf.st_size);
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diff changeset
227 if (buf_readfile(svr_opts.banner, svr_opts.bannerfile)!=DROPBEAR_SUCCESS) {
4
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228 dropbear_exit("Error reading banner file '%s'",
24
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diff changeset
229 svr_opts.bannerfile);
4
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diff changeset
230 }
24
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diff changeset
231 buf_setpos(svr_opts.banner, 0);
4
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232 }
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233
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diff changeset
234 /* not yet
24
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diff changeset
235 if (!(svr_opts.ipv4 || svr_opts.ipv6)) {
4
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diff changeset
236 fprintf(stderr, "You can't disable ipv4 and ipv6.\n");
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diff changeset
237 exit(1);
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238 }
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diff changeset
239 */
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240
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diff changeset
241 /* create the array of listening ports */
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diff changeset
242 if (portnum == 0) {
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diff changeset
243 /* non specified */
24
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diff changeset
244 svr_opts.portcount = 1;
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diff changeset
245 svr_opts.ports = m_malloc(sizeof(uint16_t));
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diff changeset
246 svr_opts.ports[0] = DROPBEAR_PORT;
4
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diff changeset
247 } else {
24
469950e86d0f switching to global vars
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diff changeset
248 svr_opts.portcount = portnum;
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diff changeset
249 svr_opts.ports = (uint16_t*)m_malloc(sizeof(uint16_t)*portnum);
4
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diff changeset
250 for (i = 0; i < portnum; i++) {
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parents:
diff changeset
251 if (portstring[i]) {
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parents:
diff changeset
252 longport = atoi(portstring[i]);
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parents:
diff changeset
253 if (longport <= 65535 && longport > 0) {
24
469950e86d0f switching to global vars
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parents: 4
diff changeset
254 svr_opts.ports[i] = (uint16_t)longport;
4
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parents:
diff changeset
255 continue;
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parents:
diff changeset
256 }
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parents:
diff changeset
257 }
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parents:
diff changeset
258 fprintf(stderr, "Bad port '%s'\n",
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parents:
diff changeset
259 portstring[i] ? portstring[i] : "null");
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parents:
diff changeset
260 }
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parents:
diff changeset
261 }
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parents:
diff changeset
262
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parents:
diff changeset
263 }
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diff changeset
264
47
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parents: 33
diff changeset
265 static void disablekey(int type, const char* filename) {
4
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diff changeset
266
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parents:
diff changeset
267 int i;
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parents:
diff changeset
268
47
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parents: 33
diff changeset
269 for (i = 0; sshhostkey[i].name != NULL; i++) {
4b53a43f0082 - client pubkey auth works
Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
270 if (sshhostkey[i].val == type) {
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Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
271 sshhostkey[i].usable = 0;
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Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
272 break;
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parents: 33
diff changeset
273 }
4
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parents:
diff changeset
274 }
47
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parents: 33
diff changeset
275 fprintf(stderr, "Failed reading '%s', disabling %s\n", filename,
4b53a43f0082 - client pubkey auth works
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parents: 33
diff changeset
276 type == DROPBEAR_SIGNKEY_DSS ? "DSS" : "RSA");
4
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parents:
diff changeset
277 }
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parents:
diff changeset
278
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parents:
diff changeset
279 static sign_key * loadhostkeys(const char * dsskeyfile,
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parents:
diff changeset
280 const char * rsakeyfile) {
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parents:
diff changeset
281
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parents:
diff changeset
282 sign_key * hostkey;
47
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parents: 33
diff changeset
283 int ret;
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parents: 33
diff changeset
284 int type;
4
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parents:
diff changeset
285
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parents:
diff changeset
286 TRACE(("enter loadhostkeys"));
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parents:
diff changeset
287
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parents:
diff changeset
288 hostkey = new_sign_key();
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parents:
diff changeset
289
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parents:
diff changeset
290 #ifdef DROPBEAR_RSA
47
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parents: 33
diff changeset
291 type = DROPBEAR_SIGNKEY_RSA;
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Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
292 ret = readhostkey(rsakeyfile, hostkey, &type);
4b53a43f0082 - client pubkey auth works
Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
293 if (ret == DROPBEAR_FAILURE) {
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Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
294 disablekey(DROPBEAR_SIGNKEY_RSA, rsakeyfile);
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Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
295 }
4
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parents:
diff changeset
296 #endif
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diff changeset
297 #ifdef DROPBEAR_DSS
47
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parents: 33
diff changeset
298 type = DROPBEAR_SIGNKEY_RSA;
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parents: 33
diff changeset
299 ret = readhostkey(dsskeyfile, hostkey, &type);
4b53a43f0082 - client pubkey auth works
Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
300 if (ret == DROPBEAR_FAILURE) {
4b53a43f0082 - client pubkey auth works
Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
301 disablekey(DROPBEAR_SIGNKEY_DSS, dsskeyfile);
4b53a43f0082 - client pubkey auth works
Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
302 }
4
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parents:
diff changeset
303 #endif
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parents:
diff changeset
304
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parents:
diff changeset
305 if ( 1
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parents:
diff changeset
306 #ifdef DROPBEAR_DSS
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parents:
diff changeset
307 && hostkey->dsskey == NULL
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parents:
diff changeset
308 #endif
fe6bca95afa7 Makefile.in contains updated files required
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parents:
diff changeset
309 #ifdef DROPBEAR_RSA
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parents:
diff changeset
310 && hostkey->rsakey == NULL
fe6bca95afa7 Makefile.in contains updated files required
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311 #endif
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312 ) {
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313 dropbear_exit("No hostkeys available");
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314 }
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315
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316 TRACE(("leave loadhostkeys"));
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317 return hostkey;
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318 }