Mercurial > dropbear
annotate svr-runopts.c @ 442:d82a2a44c684
Add -u option to specify /dev/urandom instead
author | Matt Johnston <matt@ucc.asn.au> |
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date | Mon, 16 Apr 2007 13:39:50 +0000 |
parents | 337c45621e81 |
children | 2cd2edfa11ee |
rev | line source |
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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 #include "random.h" |
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32 |
24 | 33 svr_runopts svr_opts; /* GLOBAL */ |
34 | |
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35 static void printhelp(const char * progname); |
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36 static void addportandaddress(char* spec); |
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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" |
121 | 64 #if defined(ENABLE_SVR_PASSWORD_AUTH) || defined(ENABLE_SVR_PAM_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 #ifdef ENABLE_SVR_LOCALTCPFWD |
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69 "-j Disable local port forwarding\n" |
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70 #endif |
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71 #ifdef ENABLE_SVR_REMOTETCPFWD |
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72 "-k Disable remote port forwarding\n" |
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73 "-a Allow connections to forwarded ports from any host\n" |
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74 #endif |
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75 "-p [address:]port\n" |
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76 " Listen on specified tcp port (and optionally address),\n" |
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77 " up to %d can be specified\n" |
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78 " (default port is %s if none specified)\n" |
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79 "-P PidFile Create pid file PidFile\n" |
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80 " (default %s)\n" |
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81 #ifdef INETD_MODE |
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82 "-i Start for inetd\n" |
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83 #endif |
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84 "-u Use /dev/urandom - use with caution\n" |
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85 #ifdef DEBUG_TRACE |
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86 "-v verbose\n" |
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87 #endif |
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88 ,DROPBEAR_VERSION, progname, |
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89 #ifdef DROPBEAR_DSS |
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90 DSS_PRIV_FILENAME, |
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91 #endif |
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92 #ifdef DROPBEAR_RSA |
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93 RSA_PRIV_FILENAME, |
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94 #endif |
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95 DROPBEAR_MAX_PORTS, DROPBEAR_DEFPORT, DROPBEAR_PIDFILE); |
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96 } |
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97 |
24 | 98 void svr_getopts(int argc, char ** argv) { |
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99 |
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100 unsigned int i; |
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101 char ** next = 0; |
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102 int nextisport = 0; |
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103 |
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104 /* see printhelp() for options */ |
24 | 105 svr_opts.rsakeyfile = NULL; |
106 svr_opts.dsskeyfile = NULL; | |
107 svr_opts.bannerfile = NULL; | |
108 svr_opts.banner = NULL; | |
109 svr_opts.forkbg = 1; | |
110 svr_opts.norootlogin = 0; | |
111 svr_opts.noauthpass = 0; | |
112 svr_opts.norootpass = 0; | |
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113 svr_opts.inetdmode = 0; |
101
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114 svr_opts.portcount = 0; |
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115 svr_opts.hostkey = NULL; |
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116 svr_opts.pidfile = DROPBEAR_PIDFILE; |
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117 #ifdef ENABLE_SVR_LOCALTCPFWD |
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118 svr_opts.nolocaltcp = 0; |
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119 #endif |
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120 #ifdef ENABLE_SVR_REMOTETCPFWD |
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121 svr_opts.noremotetcp = 0; |
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122 #endif |
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123 /* not yet |
33 | 124 opts.ipv4 = 1; |
125 opts.ipv6 = 1; | |
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126 */ |
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127 #ifdef DO_MOTD |
24 | 128 svr_opts.domotd = 1; |
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129 #endif |
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130 #ifndef DISABLE_SYSLOG |
24 | 131 svr_opts.usingsyslog = 1; |
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132 #endif |
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133 #ifdef ENABLE_SVR_REMOTETCPFWD |
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134 opts.listen_fwd_all = 0; |
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135 #endif |
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136 |
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137 for (i = 1; i < (unsigned int)argc; i++) { |
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138 if (nextisport) { |
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139 addportandaddress(argv[i]); |
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140 nextisport = 0; |
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141 continue; |
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142 } |
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143 |
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144 if (next) { |
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145 *next = argv[i]; |
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146 if (*next == NULL) { |
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147 dropbear_exit("Invalid null argument"); |
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148 } |
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149 next = 0x00; |
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150 continue; |
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151 } |
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152 |
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153 if (argv[i][0] == '-') { |
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154 switch (argv[i][1]) { |
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155 case 'b': |
24 | 156 next = &svr_opts.bannerfile; |
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157 break; |
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158 #ifdef DROPBEAR_DSS |
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159 case 'd': |
24 | 160 next = &svr_opts.dsskeyfile; |
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161 break; |
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162 #endif |
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163 #ifdef DROPBEAR_RSA |
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164 case 'r': |
24 | 165 next = &svr_opts.rsakeyfile; |
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166 break; |
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167 #endif |
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168 case 'F': |
24 | 169 svr_opts.forkbg = 0; |
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170 break; |
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171 #ifndef DISABLE_SYSLOG |
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172 case 'E': |
24 | 173 svr_opts.usingsyslog = 0; |
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174 break; |
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175 #endif |
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176 #ifdef ENABLE_SVR_LOCALTCPFWD |
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177 case 'j': |
258
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178 svr_opts.nolocaltcp = 1; |
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179 break; |
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180 #endif |
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181 #ifdef ENABLE_SVR_REMOTETCPFWD |
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182 case 'k': |
258
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183 svr_opts.noremotetcp = 1; |
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184 break; |
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185 case 'a': |
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186 opts.listen_fwd_all = 1; |
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187 break; |
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188 #endif |
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189 #ifdef INETD_MODE |
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190 case 'i': |
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191 svr_opts.inetdmode = 1; |
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192 break; |
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193 #endif |
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194 case 'p': |
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195 nextisport = 1; |
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196 break; |
323
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197 case 'P': |
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198 next = &svr_opts.pidfile; |
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199 break; |
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200 #ifdef DO_MOTD |
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201 /* motd is displayed by default, -m turns it off */ |
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202 case 'm': |
24 | 203 svr_opts.domotd = 0; |
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204 break; |
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205 #endif |
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206 case 'w': |
24 | 207 svr_opts.norootlogin = 1; |
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208 break; |
121 | 209 #if defined(ENABLE_SVR_PASSWORD_AUTH) || defined(ENABLE_SVR_PAM_AUTH) |
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210 case 's': |
24 | 211 svr_opts.noauthpass = 1; |
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212 break; |
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213 case 'g': |
24 | 214 svr_opts.norootpass = 1; |
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215 break; |
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216 #endif |
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217 case 'h': |
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218 printhelp(argv[0]); |
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219 exit(EXIT_FAILURE); |
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220 break; |
442
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|
221 case 'u': |
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222 random_dev = DROPBEAR_URANDOM_DEV; |
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223 break; |
94
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224 #ifdef DEBUG_TRACE |
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225 case 'v': |
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226 debug_trace = 1; |
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227 break; |
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228 #endif |
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229 default: |
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230 fprintf(stderr, "Unknown argument %s\n", argv[i]); |
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231 printhelp(argv[0]); |
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232 exit(EXIT_FAILURE); |
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233 break; |
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234 } |
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235 } |
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236 } |
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237 |
101
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238 /* Set up listening ports */ |
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239 if (svr_opts.portcount == 0) { |
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240 svr_opts.ports[0] = m_strdup(DROPBEAR_DEFPORT); |
434
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241 svr_opts.addresses[0] = m_strdup(DROPBEAR_DEFADDRESS); |
101
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242 svr_opts.portcount = 1; |
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243 } |
434
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244 |
24 | 245 if (svr_opts.dsskeyfile == NULL) { |
246 svr_opts.dsskeyfile = DSS_PRIV_FILENAME; | |
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247 } |
24 | 248 if (svr_opts.rsakeyfile == NULL) { |
249 svr_opts.rsakeyfile = RSA_PRIV_FILENAME; | |
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250 } |
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251 |
24 | 252 if (svr_opts.bannerfile) { |
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253 struct stat buf; |
24 | 254 if (stat(svr_opts.bannerfile, &buf) != 0) { |
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255 dropbear_exit("Error opening banner file '%s'", |
24 | 256 svr_opts.bannerfile); |
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257 } |
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258 |
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259 if (buf.st_size > MAX_BANNER_SIZE) { |
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260 dropbear_exit("Banner file too large, max is %d bytes", |
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261 MAX_BANNER_SIZE); |
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262 } |
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263 |
24 | 264 svr_opts.banner = buf_new(buf.st_size); |
265 if (buf_readfile(svr_opts.banner, svr_opts.bannerfile)!=DROPBEAR_SUCCESS) { | |
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266 dropbear_exit("Error reading banner file '%s'", |
24 | 267 svr_opts.bannerfile); |
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268 } |
24 | 269 buf_setpos(svr_opts.banner, 0); |
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270 } |
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271 |
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272 } |
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273 |
434
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274 static void addportandaddress(char* spec) { |
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275 |
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276 char *myspec = NULL; |
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277 |
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278 if (svr_opts.portcount < DROPBEAR_MAX_PORTS) { |
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279 |
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280 /* We don't free it, it becomes part of the runopt state */ |
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281 myspec = m_strdup(spec); |
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282 |
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283 /* search for ':', that separates address and port */ |
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284 svr_opts.ports[svr_opts.portcount] = strchr(myspec, ':'); |
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285 |
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286 if (svr_opts.ports[svr_opts.portcount] == NULL) { |
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287 /* no ':' -> the whole string specifies just a port */ |
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288 svr_opts.ports[svr_opts.portcount] = myspec; |
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289 } else { |
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290 /* Split the address/port */ |
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291 svr_opts.ports[svr_opts.portcount][0] = '\0'; |
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292 svr_opts.ports[svr_opts.portcount]++; |
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293 svr_opts.addresses[svr_opts.portcount] = myspec; |
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294 } |
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295 |
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296 if (svr_opts.addresses[svr_opts.portcount] == NULL) { |
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297 /* no address given -> fill in the default address */ |
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298 svr_opts.addresses[svr_opts.portcount] = m_strdup(DROPBEAR_DEFADDRESS); |
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299 } |
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300 |
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301 if (svr_opts.ports[svr_opts.portcount][0] == '\0') { |
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302 /* empty port -> exit */ |
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303 dropbear_exit("Bad port"); |
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304 } |
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305 |
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306 svr_opts.portcount++; |
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307 } |
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308 } |
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309 |
47 | 310 static void disablekey(int type, const char* filename) { |
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311 |
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312 int i; |
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313 |
47 | 314 for (i = 0; sshhostkey[i].name != NULL; i++) { |
315 if (sshhostkey[i].val == type) { | |
316 sshhostkey[i].usable = 0; | |
317 break; | |
318 } | |
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319 } |
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320 dropbear_log(LOG_WARNING, "Failed reading '%s', disabling %s", filename, |
47 | 321 type == DROPBEAR_SIGNKEY_DSS ? "DSS" : "RSA"); |
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322 } |
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323 |
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324 /* Must be called after syslog/etc is working */ |
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325 void loadhostkeys() { |
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326 |
47 | 327 int ret; |
328 int type; | |
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329 |
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330 TRACE(("enter loadhostkeys")) |
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331 |
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332 svr_opts.hostkey = new_sign_key(); |
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333 |
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334 #ifdef DROPBEAR_RSA |
47 | 335 type = DROPBEAR_SIGNKEY_RSA; |
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336 ret = readhostkey(svr_opts.rsakeyfile, svr_opts.hostkey, &type); |
47 | 337 if (ret == DROPBEAR_FAILURE) { |
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338 disablekey(DROPBEAR_SIGNKEY_RSA, svr_opts.rsakeyfile); |
47 | 339 } |
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340 #endif |
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341 #ifdef DROPBEAR_DSS |
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342 type = DROPBEAR_SIGNKEY_DSS; |
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343 ret = readhostkey(svr_opts.dsskeyfile, svr_opts.hostkey, &type); |
47 | 344 if (ret == DROPBEAR_FAILURE) { |
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345 disablekey(DROPBEAR_SIGNKEY_DSS, svr_opts.dsskeyfile); |
47 | 346 } |
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347 #endif |
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348 |
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349 if ( 1 |
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350 #ifdef DROPBEAR_DSS |
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351 && svr_opts.hostkey->dsskey == NULL |
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352 #endif |
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353 #ifdef DROPBEAR_RSA |
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354 && svr_opts.hostkey->rsakey == NULL |
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355 #endif |
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356 ) { |
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357 dropbear_exit("No hostkeys available"); |
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358 } |
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359 |
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360 TRACE(("leave loadhostkeys")) |
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361 } |