Mercurial > dropbear
annotate svr-runopts.c @ 452:4cab61369879
Prevent invalid packets being sent during key-exchange, instead queue
them until afterwards. This could sometimes terminate connections
after 8 hours if (for example) a new TCP forwarded connection
was sent at the KEX timeout.
author | Matt Johnston <matt@ucc.asn.au> |
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date | Fri, 27 Jul 2007 17:13:42 +0000 |
parents | 3e6c536bc023 |
children | 7e43f5e473b9 |
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 |
24 | 32 svr_runopts svr_opts; /* GLOBAL */ |
33 | |
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34 static void printhelp(const char * progname); |
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35 static void addportandaddress(char* spec); |
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36 |
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37 static void printhelp(const char * progname) { |
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38 |
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39 fprintf(stderr, "Dropbear sshd v%s\n" |
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40 "Usage: %s [options]\n" |
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41 "Options are:\n" |
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42 "-b bannerfile Display the contents of bannerfile" |
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43 " before user login\n" |
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44 " (default: none)\n" |
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45 #ifdef DROPBEAR_DSS |
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46 "-d dsskeyfile Use dsskeyfile for the dss host key\n" |
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47 " (default: %s)\n" |
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48 #endif |
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49 #ifdef DROPBEAR_RSA |
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50 "-r rsakeyfile Use rsakeyfile for the rsa host key\n" |
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51 " (default: %s)\n" |
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52 #endif |
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53 "-F Don't fork into background\n" |
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54 #ifdef DISABLE_SYSLOG |
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55 "(Syslog support not compiled in, using stderr)\n" |
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56 #else |
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57 "-E Log to stderr rather than syslog\n" |
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58 #endif |
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59 #ifdef DO_MOTD |
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60 "-m Don't display the motd on login\n" |
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61 #endif |
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62 "-w Disallow root logins\n" |
121 | 63 #if defined(ENABLE_SVR_PASSWORD_AUTH) || defined(ENABLE_SVR_PAM_AUTH) |
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64 "-s Disable password logins\n" |
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65 "-g Disable password logins for root\n" |
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66 #endif |
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67 #ifdef ENABLE_SVR_LOCALTCPFWD |
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68 "-j Disable local port forwarding\n" |
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69 #endif |
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70 #ifdef ENABLE_SVR_REMOTETCPFWD |
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71 "-k Disable remote port forwarding\n" |
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72 "-a Allow connections to forwarded ports from any host\n" |
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73 #endif |
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74 "-p [address:]port\n" |
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75 " Listen on specified tcp port (and optionally address),\n" |
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76 " up to %d can be specified\n" |
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77 " (default port is %s if none specified)\n" |
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78 "-P PidFile Create pid file PidFile\n" |
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79 " (default %s)\n" |
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80 #ifdef INETD_MODE |
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81 "-i Start for inetd\n" |
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82 #endif |
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83 "-W <receive_window_buffer> (default %d, larger may be faster)\n" |
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84 #ifdef DEBUG_TRACE |
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85 "-v verbose\n" |
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86 #endif |
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87 ,DROPBEAR_VERSION, progname, |
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88 #ifdef DROPBEAR_DSS |
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89 DSS_PRIV_FILENAME, |
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90 #endif |
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91 #ifdef DROPBEAR_RSA |
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92 RSA_PRIV_FILENAME, |
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93 #endif |
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94 DROPBEAR_MAX_PORTS, DROPBEAR_DEFPORT, DROPBEAR_PIDFILE, DEFAULT_RECV_WINDOW); |
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95 } |
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96 |
24 | 97 void svr_getopts(int argc, char ** argv) { |
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98 |
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99 unsigned int i; |
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100 char ** next = 0; |
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101 int nextisport = 0; |
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102 |
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103 /* see printhelp() for options */ |
24 | 104 svr_opts.rsakeyfile = NULL; |
105 svr_opts.dsskeyfile = NULL; | |
106 svr_opts.bannerfile = NULL; | |
107 svr_opts.banner = NULL; | |
108 svr_opts.forkbg = 1; | |
109 svr_opts.norootlogin = 0; | |
110 svr_opts.noauthpass = 0; | |
111 svr_opts.norootpass = 0; | |
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112 svr_opts.inetdmode = 0; |
101
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113 svr_opts.portcount = 0; |
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114 svr_opts.hostkey = NULL; |
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115 svr_opts.pidfile = DROPBEAR_PIDFILE; |
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116 #ifdef ENABLE_SVR_LOCALTCPFWD |
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117 svr_opts.nolocaltcp = 0; |
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118 #endif |
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119 #ifdef ENABLE_SVR_REMOTETCPFWD |
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120 svr_opts.noremotetcp = 0; |
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121 #endif |
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122 /* not yet |
33 | 123 opts.ipv4 = 1; |
124 opts.ipv6 = 1; | |
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125 */ |
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126 #ifdef DO_MOTD |
24 | 127 svr_opts.domotd = 1; |
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128 #endif |
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129 #ifndef DISABLE_SYSLOG |
24 | 130 svr_opts.usingsyslog = 1; |
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131 #endif |
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132 opts.recv_window = DEFAULT_RECV_WINDOW; |
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133 char* recv_window_arg = NULL; |
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134 #ifdef ENABLE_SVR_REMOTETCPFWD |
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135 opts.listen_fwd_all = 0; |
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136 #endif |
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137 |
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138 for (i = 1; i < (unsigned int)argc; i++) { |
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139 if (nextisport) { |
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140 addportandaddress(argv[i]); |
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141 nextisport = 0; |
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142 continue; |
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143 } |
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144 |
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145 if (next) { |
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146 *next = argv[i]; |
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147 if (*next == NULL) { |
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148 dropbear_exit("Invalid null argument"); |
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149 } |
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150 next = 0x00; |
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151 continue; |
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152 } |
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153 |
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154 if (argv[i][0] == '-') { |
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155 switch (argv[i][1]) { |
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156 case 'b': |
24 | 157 next = &svr_opts.bannerfile; |
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158 break; |
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159 #ifdef DROPBEAR_DSS |
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160 case 'd': |
24 | 161 next = &svr_opts.dsskeyfile; |
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162 break; |
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163 #endif |
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164 #ifdef DROPBEAR_RSA |
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165 case 'r': |
24 | 166 next = &svr_opts.rsakeyfile; |
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167 break; |
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168 #endif |
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169 case 'F': |
24 | 170 svr_opts.forkbg = 0; |
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171 break; |
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172 #ifndef DISABLE_SYSLOG |
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173 case 'E': |
24 | 174 svr_opts.usingsyslog = 0; |
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175 break; |
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176 #endif |
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177 #ifdef ENABLE_SVR_LOCALTCPFWD |
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178 case 'j': |
258
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179 svr_opts.nolocaltcp = 1; |
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180 break; |
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181 #endif |
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182 #ifdef ENABLE_SVR_REMOTETCPFWD |
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183 case 'k': |
258
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184 svr_opts.noremotetcp = 1; |
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185 break; |
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186 case 'a': |
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187 opts.listen_fwd_all = 1; |
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188 break; |
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189 #endif |
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190 #ifdef INETD_MODE |
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191 case 'i': |
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192 svr_opts.inetdmode = 1; |
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193 break; |
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194 #endif |
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195 case 'p': |
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196 nextisport = 1; |
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197 break; |
323
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198 case 'P': |
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199 next = &svr_opts.pidfile; |
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200 break; |
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201 #ifdef DO_MOTD |
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202 /* motd is displayed by default, -m turns it off */ |
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203 case 'm': |
24 | 204 svr_opts.domotd = 0; |
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205 break; |
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206 #endif |
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207 case 'w': |
24 | 208 svr_opts.norootlogin = 1; |
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209 break; |
449
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210 case 'W': |
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211 next = &recv_window_arg; |
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212 break; |
121 | 213 #if defined(ENABLE_SVR_PASSWORD_AUTH) || defined(ENABLE_SVR_PAM_AUTH) |
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214 case 's': |
24 | 215 svr_opts.noauthpass = 1; |
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216 break; |
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217 case 'g': |
24 | 218 svr_opts.norootpass = 1; |
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219 break; |
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220 #endif |
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221 case 'h': |
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222 printhelp(argv[0]); |
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223 exit(EXIT_FAILURE); |
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224 break; |
442
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225 case 'u': |
446
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226 /* backwards compatibility with old urandom option */ |
442
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227 break; |
94
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228 #ifdef DEBUG_TRACE |
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229 case 'v': |
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230 debug_trace = 1; |
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231 break; |
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232 #endif |
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233 default: |
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234 fprintf(stderr, "Unknown argument %s\n", argv[i]); |
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235 printhelp(argv[0]); |
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236 exit(EXIT_FAILURE); |
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237 break; |
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238 } |
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239 } |
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240 } |
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241 |
101
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242 /* Set up listening ports */ |
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243 if (svr_opts.portcount == 0) { |
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244 svr_opts.ports[0] = m_strdup(DROPBEAR_DEFPORT); |
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245 svr_opts.addresses[0] = m_strdup(DROPBEAR_DEFADDRESS); |
101
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246 svr_opts.portcount = 1; |
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247 } |
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248 |
24 | 249 if (svr_opts.dsskeyfile == NULL) { |
250 svr_opts.dsskeyfile = DSS_PRIV_FILENAME; | |
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251 } |
24 | 252 if (svr_opts.rsakeyfile == NULL) { |
253 svr_opts.rsakeyfile = RSA_PRIV_FILENAME; | |
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254 } |
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255 |
24 | 256 if (svr_opts.bannerfile) { |
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257 struct stat buf; |
24 | 258 if (stat(svr_opts.bannerfile, &buf) != 0) { |
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259 dropbear_exit("Error opening banner file '%s'", |
24 | 260 svr_opts.bannerfile); |
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261 } |
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262 |
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263 if (buf.st_size > MAX_BANNER_SIZE) { |
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264 dropbear_exit("Banner file too large, max is %d bytes", |
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265 MAX_BANNER_SIZE); |
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266 } |
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267 |
24 | 268 svr_opts.banner = buf_new(buf.st_size); |
269 if (buf_readfile(svr_opts.banner, svr_opts.bannerfile)!=DROPBEAR_SUCCESS) { | |
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270 dropbear_exit("Error reading banner file '%s'", |
24 | 271 svr_opts.bannerfile); |
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272 } |
24 | 273 buf_setpos(svr_opts.banner, 0); |
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274 |
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275 } |
449
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276 |
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277 if (recv_window_arg) |
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278 { |
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279 opts.recv_window = atol(recv_window_arg); |
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280 if (opts.recv_window == 0) |
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281 { |
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282 dropbear_exit("Bad recv window '%s'", recv_window_arg); |
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283 } |
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284 } |
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285 } |
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286 |
434
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287 static void addportandaddress(char* spec) { |
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288 |
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289 char *myspec = NULL; |
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290 |
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291 if (svr_opts.portcount < DROPBEAR_MAX_PORTS) { |
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292 |
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293 /* We don't free it, it becomes part of the runopt state */ |
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294 myspec = m_strdup(spec); |
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295 |
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296 /* search for ':', that separates address and port */ |
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297 svr_opts.ports[svr_opts.portcount] = strchr(myspec, ':'); |
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298 |
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299 if (svr_opts.ports[svr_opts.portcount] == NULL) { |
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300 /* no ':' -> the whole string specifies just a port */ |
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301 svr_opts.ports[svr_opts.portcount] = myspec; |
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302 } else { |
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303 /* Split the address/port */ |
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304 svr_opts.ports[svr_opts.portcount][0] = '\0'; |
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305 svr_opts.ports[svr_opts.portcount]++; |
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306 svr_opts.addresses[svr_opts.portcount] = myspec; |
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307 } |
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308 |
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309 if (svr_opts.addresses[svr_opts.portcount] == NULL) { |
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310 /* no address given -> fill in the default address */ |
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311 svr_opts.addresses[svr_opts.portcount] = m_strdup(DROPBEAR_DEFADDRESS); |
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312 } |
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313 |
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314 if (svr_opts.ports[svr_opts.portcount][0] == '\0') { |
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315 /* empty port -> exit */ |
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316 dropbear_exit("Bad port"); |
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317 } |
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318 |
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319 svr_opts.portcount++; |
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320 } |
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321 } |
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322 |
47 | 323 static void disablekey(int type, const char* filename) { |
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324 |
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325 int i; |
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326 |
47 | 327 for (i = 0; sshhostkey[i].name != NULL; i++) { |
328 if (sshhostkey[i].val == type) { | |
329 sshhostkey[i].usable = 0; | |
330 break; | |
331 } | |
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332 } |
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333 dropbear_log(LOG_WARNING, "Failed reading '%s', disabling %s", filename, |
47 | 334 type == DROPBEAR_SIGNKEY_DSS ? "DSS" : "RSA"); |
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335 } |
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336 |
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337 /* Must be called after syslog/etc is working */ |
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338 void loadhostkeys() { |
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339 |
47 | 340 int ret; |
341 int type; | |
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342 |
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343 TRACE(("enter loadhostkeys")) |
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344 |
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345 svr_opts.hostkey = new_sign_key(); |
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346 |
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347 #ifdef DROPBEAR_RSA |
47 | 348 type = DROPBEAR_SIGNKEY_RSA; |
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349 ret = readhostkey(svr_opts.rsakeyfile, svr_opts.hostkey, &type); |
47 | 350 if (ret == DROPBEAR_FAILURE) { |
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351 disablekey(DROPBEAR_SIGNKEY_RSA, svr_opts.rsakeyfile); |
47 | 352 } |
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353 #endif |
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354 #ifdef DROPBEAR_DSS |
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355 type = DROPBEAR_SIGNKEY_DSS; |
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356 ret = readhostkey(svr_opts.dsskeyfile, svr_opts.hostkey, &type); |
47 | 357 if (ret == DROPBEAR_FAILURE) { |
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358 disablekey(DROPBEAR_SIGNKEY_DSS, svr_opts.dsskeyfile); |
47 | 359 } |
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360 #endif |
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361 |
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362 if ( 1 |
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363 #ifdef DROPBEAR_DSS |
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364 && svr_opts.hostkey->dsskey == NULL |
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365 #endif |
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366 #ifdef DROPBEAR_RSA |
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367 && svr_opts.hostkey->rsakey == NULL |
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368 #endif |
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369 ) { |
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370 dropbear_exit("No hostkeys available"); |
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371 } |
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372 |
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373 TRACE(("leave loadhostkeys")) |
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374 } |