annotate svr-runopts.c @ 96:b8e36c1a5520

Mention the race condition between setting the childpid entry, and the child exiting.
author Matt Johnston <matt@ucc.asn.au>
date Wed, 18 Aug 2004 16:42:08 +0000
parents c85c88500ea6
children 72dc22f56858
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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 ENABLE_SVR_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"
71
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76 #ifdef INETD_MODE
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77 "-i Start for inetd\n"
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78 #endif
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79 #ifdef DEBUG_TRACE
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80 "-v verbose\n"
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81 #endif
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82 ,DROPBEAR_VERSION, progname,
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83 #ifdef DROPBEAR_DSS
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84 DSS_PRIV_FILENAME,
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85 #endif
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86 #ifdef DROPBEAR_RSA
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87 RSA_PRIV_FILENAME,
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88 #endif
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89 DROPBEAR_MAX_PORTS, DROPBEAR_PORT);
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90 }
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91
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92 void svr_getopts(int argc, char ** argv) {
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93
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94 unsigned int i;
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95 char ** next = 0;
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96 unsigned int portnum = 0;
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97 char *portstring[DROPBEAR_MAX_PORTS];
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98 unsigned int longport;
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99
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100 /* see printhelp() for options */
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101 svr_opts.rsakeyfile = NULL;
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102 svr_opts.dsskeyfile = NULL;
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103 svr_opts.bannerfile = NULL;
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104 svr_opts.banner = NULL;
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105 svr_opts.forkbg = 1;
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106 svr_opts.norootlogin = 0;
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107 svr_opts.noauthpass = 0;
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108 svr_opts.norootpass = 0;
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109 svr_opts.inetdmode = 0;
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110 opts.nolocaltcp = 0;
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111 opts.noremotetcp = 0;
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112 /* not yet
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113 opts.ipv4 = 1;
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114 opts.ipv6 = 1;
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115 */
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116 #ifdef DO_MOTD
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117 svr_opts.domotd = 1;
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118 #endif
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119 #ifndef DISABLE_SYSLOG
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120 svr_opts.usingsyslog = 1;
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121 #endif
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122
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123 for (i = 1; i < (unsigned int)argc; i++) {
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124 if (next) {
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125 *next = argv[i];
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126 if (*next == NULL) {
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127 dropbear_exit("Invalid null argument");
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128 }
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129 next = 0x00;
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130 continue;
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131 }
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132
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133 if (argv[i][0] == '-') {
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134 switch (argv[i][1]) {
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135 case 'b':
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136 next = &svr_opts.bannerfile;
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137 break;
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138 #ifdef DROPBEAR_DSS
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139 case 'd':
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140 next = &svr_opts.dsskeyfile;
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141 break;
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142 #endif
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143 #ifdef DROPBEAR_RSA
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144 case 'r':
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145 next = &svr_opts.rsakeyfile;
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146 break;
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147 #endif
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148 case 'F':
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149 svr_opts.forkbg = 0;
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150 break;
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151 #ifndef DISABLE_SYSLOG
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152 case 'E':
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153 svr_opts.usingsyslog = 0;
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154 break;
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155 #endif
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156 #ifndef DISABLE_LOCALTCPFWD
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157 case 'j':
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diff changeset
158 opts.nolocaltcp = 1;
4
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159 break;
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160 #endif
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161 #ifndef DISABLE_REMOTETCPFWD
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162 case 'k':
24
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diff changeset
163 opts.noremotetcp = 1;
4
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164 break;
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165 #endif
71
ac96bc733e71 adding inetd mode back from 0.43
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parents: 68
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166 #ifdef INETD_MODE
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parents: 68
diff changeset
167 case 'i':
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diff changeset
168 svr_opts.inetdmode = 1;
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parents: 68
diff changeset
169 break;
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170 #endif
4
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171 case 'p':
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172 if (portnum < DROPBEAR_MAX_PORTS) {
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173 portstring[portnum] = NULL;
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174 next = &portstring[portnum];
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175 portnum++;
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176 }
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177 break;
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178 #ifdef DO_MOTD
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179 /* motd is displayed by default, -m turns it off */
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180 case 'm':
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181 svr_opts.domotd = 0;
4
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182 break;
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183 #endif
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184 case 'w':
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185 svr_opts.norootlogin = 1;
4
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186 break;
68
eee77ac31ccc cleaning up the pubkey defines
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diff changeset
187 #ifdef ENABLE_SVR_PASSWORD_AUTH
4
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188 case 's':
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189 svr_opts.noauthpass = 1;
4
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190 break;
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191 case 'g':
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192 svr_opts.norootpass = 1;
4
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193 break;
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194 #endif
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195 case 'h':
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196 printhelp(argv[0]);
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197 exit(EXIT_FAILURE);
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198 break;
94
c85c88500ea6 DEBUG_TRACE now only triggers with -v on the cmdline
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199 #ifdef DEBUG_TRACE
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diff changeset
200 case 'v':
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parents: 91
diff changeset
201 debug_trace = 1;
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parents: 91
diff changeset
202 break;
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parents: 91
diff changeset
203 #endif
4
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diff changeset
204 /*
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205 case '4':
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diff changeset
206 svr_opts.ipv4 = 0;
4
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207 break;
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208 case '6':
24
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diff changeset
209 svr_opts.ipv6 = 0;
4
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210 break;
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211 */
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212 default:
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213 fprintf(stderr, "Unknown argument %s\n", argv[i]);
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diff changeset
214 printhelp(argv[0]);
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diff changeset
215 exit(EXIT_FAILURE);
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diff changeset
216 break;
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217 }
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218 }
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219 }
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220
24
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parents: 4
diff changeset
221 if (svr_opts.dsskeyfile == NULL) {
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parents: 4
diff changeset
222 svr_opts.dsskeyfile = DSS_PRIV_FILENAME;
4
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diff changeset
223 }
24
469950e86d0f switching to global vars
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parents: 4
diff changeset
224 if (svr_opts.rsakeyfile == NULL) {
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diff changeset
225 svr_opts.rsakeyfile = RSA_PRIV_FILENAME;
4
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diff changeset
226 }
24
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diff changeset
227 svr_opts.hostkey = loadhostkeys(svr_opts.dsskeyfile, svr_opts.rsakeyfile);
4
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diff changeset
228
24
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parents: 4
diff changeset
229 if (svr_opts.bannerfile) {
4
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diff changeset
230 struct stat buf;
24
469950e86d0f switching to global vars
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parents: 4
diff changeset
231 if (stat(svr_opts.bannerfile, &buf) != 0) {
4
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diff changeset
232 dropbear_exit("Error opening banner file '%s'",
24
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parents: 4
diff changeset
233 svr_opts.bannerfile);
4
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234 }
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235
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diff changeset
236 if (buf.st_size > MAX_BANNER_SIZE) {
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parents:
diff changeset
237 dropbear_exit("Banner file too large, max is %d bytes",
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parents:
diff changeset
238 MAX_BANNER_SIZE);
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parents:
diff changeset
239 }
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diff changeset
240
24
469950e86d0f switching to global vars
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parents: 4
diff changeset
241 svr_opts.banner = buf_new(buf.st_size);
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parents: 4
diff changeset
242 if (buf_readfile(svr_opts.banner, svr_opts.bannerfile)!=DROPBEAR_SUCCESS) {
4
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diff changeset
243 dropbear_exit("Error reading banner file '%s'",
24
469950e86d0f switching to global vars
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parents: 4
diff changeset
244 svr_opts.bannerfile);
4
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parents:
diff changeset
245 }
24
469950e86d0f switching to global vars
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parents: 4
diff changeset
246 buf_setpos(svr_opts.banner, 0);
4
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parents:
diff changeset
247 }
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diff changeset
248
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parents:
diff changeset
249 /* not yet
24
469950e86d0f switching to global vars
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parents: 4
diff changeset
250 if (!(svr_opts.ipv4 || svr_opts.ipv6)) {
4
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parents:
diff changeset
251 fprintf(stderr, "You can't disable ipv4 and ipv6.\n");
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parents:
diff changeset
252 exit(1);
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parents:
diff changeset
253 }
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diff changeset
254 */
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diff changeset
255
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parents:
diff changeset
256 /* create the array of listening ports */
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parents:
diff changeset
257 if (portnum == 0) {
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parents:
diff changeset
258 /* non specified */
24
469950e86d0f switching to global vars
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parents: 4
diff changeset
259 svr_opts.portcount = 1;
469950e86d0f switching to global vars
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parents: 4
diff changeset
260 svr_opts.ports = m_malloc(sizeof(uint16_t));
469950e86d0f switching to global vars
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parents: 4
diff changeset
261 svr_opts.ports[0] = DROPBEAR_PORT;
4
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parents:
diff changeset
262 } else {
24
469950e86d0f switching to global vars
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parents: 4
diff changeset
263 svr_opts.portcount = portnum;
469950e86d0f switching to global vars
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parents: 4
diff changeset
264 svr_opts.ports = (uint16_t*)m_malloc(sizeof(uint16_t)*portnum);
4
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parents:
diff changeset
265 for (i = 0; i < portnum; i++) {
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parents:
diff changeset
266 if (portstring[i]) {
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parents:
diff changeset
267 longport = atoi(portstring[i]);
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parents:
diff changeset
268 if (longport <= 65535 && longport > 0) {
24
469950e86d0f switching to global vars
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parents: 4
diff changeset
269 svr_opts.ports[i] = (uint16_t)longport;
4
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parents:
diff changeset
270 continue;
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parents:
diff changeset
271 }
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parents:
diff changeset
272 }
fe6bca95afa7 Makefile.in contains updated files required
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parents:
diff changeset
273 fprintf(stderr, "Bad port '%s'\n",
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parents:
diff changeset
274 portstring[i] ? portstring[i] : "null");
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parents:
diff changeset
275 }
fe6bca95afa7 Makefile.in contains updated files required
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parents:
diff changeset
276 }
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parents:
diff changeset
277
fe6bca95afa7 Makefile.in contains updated files required
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parents:
diff changeset
278 }
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parents:
diff changeset
279
47
4b53a43f0082 - client pubkey auth works
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parents: 33
diff changeset
280 static void disablekey(int type, const char* filename) {
4
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parents:
diff changeset
281
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parents:
diff changeset
282 int i;
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parents:
diff changeset
283
47
4b53a43f0082 - client pubkey auth works
Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
284 for (i = 0; sshhostkey[i].name != NULL; i++) {
4b53a43f0082 - client pubkey auth works
Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
285 if (sshhostkey[i].val == type) {
4b53a43f0082 - client pubkey auth works
Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
286 sshhostkey[i].usable = 0;
4b53a43f0082 - client pubkey auth works
Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
287 break;
4b53a43f0082 - client pubkey auth works
Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
288 }
4
fe6bca95afa7 Makefile.in contains updated files required
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parents:
diff changeset
289 }
47
4b53a43f0082 - client pubkey auth works
Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
290 fprintf(stderr, "Failed reading '%s', disabling %s\n", filename,
4b53a43f0082 - client pubkey auth works
Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
291 type == DROPBEAR_SIGNKEY_DSS ? "DSS" : "RSA");
4
fe6bca95afa7 Makefile.in contains updated files required
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parents:
diff changeset
292 }
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parents:
diff changeset
293
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parents:
diff changeset
294 static sign_key * loadhostkeys(const char * dsskeyfile,
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parents:
diff changeset
295 const char * rsakeyfile) {
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parents:
diff changeset
296
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parents:
diff changeset
297 sign_key * hostkey;
47
4b53a43f0082 - client pubkey auth works
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parents: 33
diff changeset
298 int ret;
4b53a43f0082 - client pubkey auth works
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parents: 33
diff changeset
299 int type;
4
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parents:
diff changeset
300
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
301 TRACE(("enter loadhostkeys"));
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parents:
diff changeset
302
fe6bca95afa7 Makefile.in contains updated files required
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parents:
diff changeset
303 hostkey = new_sign_key();
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parents:
diff changeset
304
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
305 #ifdef DROPBEAR_RSA
47
4b53a43f0082 - client pubkey auth works
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parents: 33
diff changeset
306 type = DROPBEAR_SIGNKEY_RSA;
4b53a43f0082 - client pubkey auth works
Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
307 ret = readhostkey(rsakeyfile, hostkey, &type);
4b53a43f0082 - client pubkey auth works
Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
308 if (ret == DROPBEAR_FAILURE) {
4b53a43f0082 - client pubkey auth works
Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
309 disablekey(DROPBEAR_SIGNKEY_RSA, rsakeyfile);
4b53a43f0082 - client pubkey auth works
Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
310 }
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311 #endif
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312 #ifdef DROPBEAR_DSS
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313 type = DROPBEAR_SIGNKEY_DSS;
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314 ret = readhostkey(dsskeyfile, hostkey, &type);
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315 if (ret == DROPBEAR_FAILURE) {
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316 disablekey(DROPBEAR_SIGNKEY_DSS, dsskeyfile);
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317 }
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318 #endif
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319
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320 if ( 1
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321 #ifdef DROPBEAR_DSS
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322 && hostkey->dsskey == NULL
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323 #endif
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324 #ifdef DROPBEAR_RSA
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325 && hostkey->rsakey == NULL
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326 #endif
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327 ) {
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328 dropbear_exit("No hostkeys available");
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329 }
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330
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331 TRACE(("leave loadhostkeys"));
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332 return hostkey;
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333 }