Mercurial > dropbear
annotate svr-runopts.c @ 1007:cbd674d63cd4 DROPBEAR_2015.67
changelog for 2015.67
author | Matt Johnston <matt@ucc.asn.au> |
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date | Wed, 28 Jan 2015 22:54:23 +0800 |
parents | 47643024fc90 |
children | 67d8a904f5a9 |
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" |
795 | 31 #include "ecdsa.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); |
795 | 37 static void loadhostkey(const char *keyfile, int fatal_duplicate); |
38 static void addhostkey(const char *keyfile); | |
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39 |
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40 static void printhelp(const char * progname) { |
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41 |
716 | 42 fprintf(stderr, "Dropbear server v%s https://matt.ucc.asn.au/dropbear/dropbear.html\n" |
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43 "Usage: %s [options]\n" |
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44 "-b bannerfile Display the contents of bannerfile" |
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45 " before user login\n" |
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46 " (default: none)\n" |
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47 "-r keyfile Specify hostkeys (repeatable)\n" |
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48 " defaults: \n" |
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49 #ifdef DROPBEAR_DSS |
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50 " dss %s\n" |
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51 #endif |
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52 #ifdef DROPBEAR_RSA |
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53 " rsa %s\n" |
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54 #endif |
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55 #ifdef DROPBEAR_ECDSA |
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56 " ecdsa %s\n" |
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57 #endif |
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58 #ifdef DROPBEAR_DELAY_HOSTKEY |
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59 "-R Create hostkeys as required\n" |
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60 #endif |
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61 "-F Don't fork into background\n" |
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62 #ifdef DISABLE_SYSLOG |
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63 "(Syslog support not compiled in, using stderr)\n" |
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64 #else |
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65 "-E Log to stderr rather than syslog\n" |
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66 #endif |
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67 #ifdef DO_MOTD |
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68 "-m Don't display the motd on login\n" |
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69 #endif |
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70 "-w Disallow root logins\n" |
121 | 71 #if defined(ENABLE_SVR_PASSWORD_AUTH) || defined(ENABLE_SVR_PAM_AUTH) |
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72 "-s Disable password logins\n" |
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73 "-g Disable password logins for root\n" |
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74 "-B Allow blank password logins\n" |
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75 #endif |
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76 #ifdef ENABLE_SVR_LOCALTCPFWD |
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77 "-j Disable local port forwarding\n" |
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78 #endif |
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79 #ifdef ENABLE_SVR_REMOTETCPFWD |
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80 "-k Disable remote port forwarding\n" |
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81 "-a Allow connections to forwarded ports from any host\n" |
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82 #endif |
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83 "-p [address:]port\n" |
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84 " Listen on specified tcp port (and optionally address),\n" |
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85 " up to %d can be specified\n" |
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86 " (default port is %s if none specified)\n" |
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87 "-P PidFile Create pid file PidFile\n" |
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88 " (default %s)\n" |
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89 #ifdef INETD_MODE |
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90 "-i Start for inetd\n" |
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91 #endif |
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92 "-W <receive_window_buffer> (default %d, larger may be faster, max 1MB)\n" |
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93 "-K <keepalive> (0 is never, default %d, in seconds)\n" |
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94 "-I <idle_timeout> (0 is never, default %d, in seconds)\n" |
946 | 95 "-V Version\n" |
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96 #ifdef DEBUG_TRACE |
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97 "-v verbose (compiled with DEBUG_TRACE)\n" |
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98 #endif |
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99 ,DROPBEAR_VERSION, progname, |
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100 #ifdef DROPBEAR_DSS |
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101 DSS_PRIV_FILENAME, |
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102 #endif |
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103 #ifdef DROPBEAR_RSA |
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104 RSA_PRIV_FILENAME, |
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105 #endif |
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106 #ifdef DROPBEAR_ECDSA |
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107 ECDSA_PRIV_FILENAME, |
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108 #endif |
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109 DROPBEAR_MAX_PORTS, DROPBEAR_DEFPORT, DROPBEAR_PIDFILE, |
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110 DEFAULT_RECV_WINDOW, DEFAULT_KEEPALIVE, DEFAULT_IDLE_TIMEOUT); |
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111 } |
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112 |
24 | 113 void svr_getopts(int argc, char ** argv) { |
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114 |
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115 unsigned int i; |
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116 char ** next = 0; |
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117 int nextisport = 0; |
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118 char* recv_window_arg = NULL; |
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119 char* keepalive_arg = NULL; |
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120 char* idle_timeout_arg = NULL; |
795 | 121 char* keyfile = NULL; |
122 | |
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123 |
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124 /* see printhelp() for options */ |
24 | 125 svr_opts.bannerfile = NULL; |
126 svr_opts.banner = NULL; | |
127 svr_opts.forkbg = 1; | |
128 svr_opts.norootlogin = 0; | |
129 svr_opts.noauthpass = 0; | |
130 svr_opts.norootpass = 0; | |
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131 svr_opts.allowblankpass = 0; |
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132 svr_opts.inetdmode = 0; |
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133 svr_opts.portcount = 0; |
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134 svr_opts.hostkey = NULL; |
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135 svr_opts.delay_hostkey = 0; |
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136 svr_opts.pidfile = DROPBEAR_PIDFILE; |
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137 #ifdef ENABLE_SVR_LOCALTCPFWD |
258
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138 svr_opts.nolocaltcp = 0; |
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139 #endif |
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140 #ifdef ENABLE_SVR_REMOTETCPFWD |
258
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141 svr_opts.noremotetcp = 0; |
271
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142 #endif |
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143 |
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144 #ifndef DISABLE_ZLIB |
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145 #if DROPBEAR_SERVER_DELAY_ZLIB |
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146 opts.compress_mode = DROPBEAR_COMPRESS_DELAYED; |
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147 #else |
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148 opts.compress_mode = DROPBEAR_COMPRESS_ON; |
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149 #endif |
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150 #endif |
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151 |
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152 /* not yet |
33 | 153 opts.ipv4 = 1; |
154 opts.ipv6 = 1; | |
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155 */ |
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156 #ifdef DO_MOTD |
24 | 157 svr_opts.domotd = 1; |
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158 #endif |
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159 #ifndef DISABLE_SYSLOG |
24 | 160 svr_opts.usingsyslog = 1; |
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161 #endif |
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162 opts.recv_window = DEFAULT_RECV_WINDOW; |
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163 opts.keepalive_secs = DEFAULT_KEEPALIVE; |
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164 opts.idle_timeout_secs = DEFAULT_IDLE_TIMEOUT; |
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165 |
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166 #ifdef ENABLE_SVR_REMOTETCPFWD |
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167 opts.listen_fwd_all = 0; |
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168 #endif |
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169 |
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170 for (i = 1; i < (unsigned int)argc; i++) { |
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171 if (nextisport) { |
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172 addportandaddress(argv[i]); |
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173 nextisport = 0; |
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174 continue; |
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175 } |
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176 |
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177 if (next) { |
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178 *next = argv[i]; |
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179 if (*next == NULL) { |
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180 dropbear_exit("Invalid null argument"); |
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181 } |
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182 next = 0x00; |
795 | 183 |
184 if (keyfile) { | |
185 addhostkey(keyfile); | |
186 keyfile = NULL; | |
187 } | |
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188 continue; |
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189 } |
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190 |
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191 if (argv[i][0] == '-') { |
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192 switch (argv[i][1]) { |
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193 case 'b': |
24 | 194 next = &svr_opts.bannerfile; |
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195 break; |
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196 case 'd': |
795 | 197 case 'r': |
198 next = &keyfile; | |
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199 break; |
847
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200 case 'R': |
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201 svr_opts.delay_hostkey = 1; |
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202 break; |
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203 case 'F': |
24 | 204 svr_opts.forkbg = 0; |
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205 break; |
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206 #ifndef DISABLE_SYSLOG |
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207 case 'E': |
24 | 208 svr_opts.usingsyslog = 0; |
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209 break; |
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210 #endif |
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211 #ifdef ENABLE_SVR_LOCALTCPFWD |
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212 case 'j': |
258
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213 svr_opts.nolocaltcp = 1; |
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214 break; |
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215 #endif |
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216 #ifdef ENABLE_SVR_REMOTETCPFWD |
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217 case 'k': |
258
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218 svr_opts.noremotetcp = 1; |
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219 break; |
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220 case 'a': |
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221 opts.listen_fwd_all = 1; |
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222 break; |
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223 #endif |
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224 #ifdef INETD_MODE |
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225 case 'i': |
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226 svr_opts.inetdmode = 1; |
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227 break; |
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228 #endif |
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229 case 'p': |
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230 nextisport = 1; |
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231 break; |
323
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232 case 'P': |
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233 next = &svr_opts.pidfile; |
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234 break; |
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235 #ifdef DO_MOTD |
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236 /* motd is displayed by default, -m turns it off */ |
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237 case 'm': |
24 | 238 svr_opts.domotd = 0; |
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239 break; |
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240 #endif |
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241 case 'w': |
24 | 242 svr_opts.norootlogin = 1; |
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243 break; |
449
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244 case 'W': |
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245 next = &recv_window_arg; |
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246 break; |
454
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247 case 'K': |
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248 next = &keepalive_arg; |
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249 break; |
513
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250 case 'I': |
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251 next = &idle_timeout_arg; |
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252 break; |
121 | 253 #if defined(ENABLE_SVR_PASSWORD_AUTH) || defined(ENABLE_SVR_PAM_AUTH) |
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254 case 's': |
24 | 255 svr_opts.noauthpass = 1; |
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256 break; |
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257 case 'g': |
24 | 258 svr_opts.norootpass = 1; |
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259 break; |
692
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260 case 'B': |
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261 svr_opts.allowblankpass = 1; |
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262 break; |
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263 #endif |
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264 case 'h': |
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265 printhelp(argv[0]); |
946 | 266 exit(EXIT_SUCCESS); |
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267 break; |
442
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268 case 'u': |
446
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269 /* backwards compatibility with old urandom option */ |
442
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270 break; |
94
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271 #ifdef DEBUG_TRACE |
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272 case 'v': |
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273 debug_trace = 1; |
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274 break; |
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275 #endif |
946 | 276 case 'V': |
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277 print_version(); |
946 | 278 exit(EXIT_SUCCESS); |
279 break; | |
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280 default: |
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281 fprintf(stderr, "Unknown argument %s\n", argv[i]); |
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282 printhelp(argv[0]); |
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283 exit(EXIT_FAILURE); |
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284 break; |
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285 } |
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286 } |
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287 } |
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288 |
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289 /* Set up listening ports */ |
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290 if (svr_opts.portcount == 0) { |
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291 svr_opts.ports[0] = m_strdup(DROPBEAR_DEFPORT); |
434
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292 svr_opts.addresses[0] = m_strdup(DROPBEAR_DEFADDRESS); |
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293 svr_opts.portcount = 1; |
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294 } |
513
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295 |
24 | 296 if (svr_opts.bannerfile) { |
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297 struct stat buf; |
24 | 298 if (stat(svr_opts.bannerfile, &buf) != 0) { |
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299 dropbear_exit("Error opening banner file '%s'", |
24 | 300 svr_opts.bannerfile); |
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301 } |
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302 |
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303 if (buf.st_size > MAX_BANNER_SIZE) { |
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304 dropbear_exit("Banner file too large, max is %d bytes", |
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305 MAX_BANNER_SIZE); |
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306 } |
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307 |
24 | 308 svr_opts.banner = buf_new(buf.st_size); |
309 if (buf_readfile(svr_opts.banner, svr_opts.bannerfile)!=DROPBEAR_SUCCESS) { | |
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310 dropbear_exit("Error reading banner file '%s'", |
24 | 311 svr_opts.bannerfile); |
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312 } |
24 | 313 buf_setpos(svr_opts.banner, 0); |
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314 } |
449
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315 |
454
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316 if (recv_window_arg) { |
449
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317 opts.recv_window = atol(recv_window_arg); |
492
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318 if (opts.recv_window == 0 || opts.recv_window > MAX_RECV_WINDOW) { |
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319 dropbear_exit("Bad recv window '%s'", recv_window_arg); |
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320 } |
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321 } |
454
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322 |
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323 if (keepalive_arg) { |
568
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324 unsigned int val; |
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325 if (m_str_to_uint(keepalive_arg, &val) == DROPBEAR_FAILURE) { |
454
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326 dropbear_exit("Bad keepalive '%s'", keepalive_arg); |
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327 } |
568
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328 opts.keepalive_secs = val; |
454
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329 } |
513
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330 |
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331 if (idle_timeout_arg) { |
568
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|
332 unsigned int val; |
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333 if (m_str_to_uint(idle_timeout_arg, &val) == DROPBEAR_FAILURE) { |
513
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334 dropbear_exit("Bad idle_timeout '%s'", idle_timeout_arg); |
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335 } |
568
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336 opts.idle_timeout_secs = val; |
513
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337 } |
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338 } |
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339 |
434
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340 static void addportandaddress(char* spec) { |
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341 |
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342 char *myspec = NULL; |
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343 |
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344 if (svr_opts.portcount < DROPBEAR_MAX_PORTS) { |
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345 |
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346 /* We don't free it, it becomes part of the runopt state */ |
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347 myspec = m_strdup(spec); |
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348 |
706
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349 if (myspec[0] == '[') { |
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350 myspec++; |
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351 svr_opts.ports[svr_opts.portcount] = strchr(myspec, ']'); |
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352 if (svr_opts.ports[svr_opts.portcount] == NULL) { |
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353 /* Unmatched [ -> exit */ |
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|
354 dropbear_exit("Bad listen address"); |
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|
355 } |
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|
356 svr_opts.ports[svr_opts.portcount][0] = '\0'; |
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|
357 svr_opts.ports[svr_opts.portcount]++; |
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|
358 if (svr_opts.ports[svr_opts.portcount][0] != ':') { |
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|
359 /* Missing port -> exit */ |
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|
360 dropbear_exit("Missing port"); |
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|
361 } |
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|
362 } else { |
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changeset
|
363 /* search for ':', that separates address and port */ |
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|
364 svr_opts.ports[svr_opts.portcount] = strrchr(myspec, ':'); |
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|
365 } |
434
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|
366 |
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|
367 if (svr_opts.ports[svr_opts.portcount] == NULL) { |
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368 /* no ':' -> the whole string specifies just a port */ |
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|
369 svr_opts.ports[svr_opts.portcount] = myspec; |
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370 } else { |
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371 /* Split the address/port */ |
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|
372 svr_opts.ports[svr_opts.portcount][0] = '\0'; |
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|
373 svr_opts.ports[svr_opts.portcount]++; |
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|
374 svr_opts.addresses[svr_opts.portcount] = myspec; |
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|
375 } |
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|
376 |
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|
377 if (svr_opts.addresses[svr_opts.portcount] == NULL) { |
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378 /* no address given -> fill in the default address */ |
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|
379 svr_opts.addresses[svr_opts.portcount] = m_strdup(DROPBEAR_DEFADDRESS); |
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|
380 } |
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|
381 |
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|
382 if (svr_opts.ports[svr_opts.portcount][0] == '\0') { |
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|
383 /* empty port -> exit */ |
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|
384 dropbear_exit("Bad port"); |
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|
385 } |
0aaaf68e97dc
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271
diff
changeset
|
386 |
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diff
changeset
|
387 svr_opts.portcount++; |
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changeset
|
388 } |
0aaaf68e97dc
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changeset
|
389 } |
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|
390 |
795 | 391 static void disablekey(int type) { |
4
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|
392 int i; |
802 | 393 TRACE(("Disabling key type %d", type)) |
47 | 394 for (i = 0; sshhostkey[i].name != NULL; i++) { |
395 if (sshhostkey[i].val == type) { | |
802 | 396 sshhostkey[i].usable = 0; |
47 | 397 break; |
398 } | |
4
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changeset
|
399 } |
fe6bca95afa7
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parents:
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changeset
|
400 } |
fe6bca95afa7
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parents:
diff
changeset
|
401 |
807
75509065db53
have separate ecdsa keys for each size
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parents:
802
diff
changeset
|
402 static void loadhostkey_helper(const char *name, void** src, void** dst, int fatal_duplicate) { |
75509065db53
have separate ecdsa keys for each size
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parents:
802
diff
changeset
|
403 if (*dst) { |
75509065db53
have separate ecdsa keys for each size
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parents:
802
diff
changeset
|
404 if (fatal_duplicate) { |
75509065db53
have separate ecdsa keys for each size
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802
diff
changeset
|
405 dropbear_exit("Only one %s key can be specified", name); |
75509065db53
have separate ecdsa keys for each size
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802
diff
changeset
|
406 } |
75509065db53
have separate ecdsa keys for each size
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parents:
802
diff
changeset
|
407 } else { |
75509065db53
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diff
changeset
|
408 *dst = *src; |
75509065db53
have separate ecdsa keys for each size
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parents:
802
diff
changeset
|
409 *src = NULL; |
75509065db53
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parents:
802
diff
changeset
|
410 } |
75509065db53
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parents:
802
diff
changeset
|
411 |
75509065db53
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Matt Johnston <matt@ucc.asn.au>
parents:
802
diff
changeset
|
412 } |
75509065db53
have separate ecdsa keys for each size
Matt Johnston <matt@ucc.asn.au>
parents:
802
diff
changeset
|
413 |
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414 /* Must be called after syslog/etc is working */ |
795 | 415 static void loadhostkey(const char *keyfile, int fatal_duplicate) { |
416 sign_key * read_key = new_sign_key(); | |
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417 enum signkey_type type = DROPBEAR_SIGNKEY_ANY; |
795 | 418 if (readhostkey(keyfile, read_key, &type) == DROPBEAR_FAILURE) { |
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419 if (!svr_opts.delay_hostkey) { |
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420 dropbear_log(LOG_WARNING, "Failed loading %s", keyfile); |
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421 } |
795 | 422 } |
423 | |
424 #ifdef DROPBEAR_RSA | |
425 if (type == DROPBEAR_SIGNKEY_RSA) { | |
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426 loadhostkey_helper("RSA", (void**)&read_key->rsakey, (void**)&svr_opts.hostkey->rsakey, fatal_duplicate); |
795 | 427 } |
428 #endif | |
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429 |
795 | 430 #ifdef DROPBEAR_DSS |
431 if (type == DROPBEAR_SIGNKEY_DSS) { | |
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432 loadhostkey_helper("DSS", (void**)&read_key->dsskey, (void**)&svr_opts.hostkey->dsskey, fatal_duplicate); |
795 | 433 } |
434 #endif | |
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435 |
795 | 436 #ifdef DROPBEAR_ECDSA |
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437 #ifdef DROPBEAR_ECC_256 |
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438 if (type == DROPBEAR_SIGNKEY_ECDSA_NISTP256) { |
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439 loadhostkey_helper("ECDSA256", (void**)&read_key->ecckey256, (void**)&svr_opts.hostkey->ecckey256, fatal_duplicate); |
795 | 440 } |
441 #endif | |
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442 #ifdef DROPBEAR_ECC_384 |
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443 if (type == DROPBEAR_SIGNKEY_ECDSA_NISTP384) { |
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444 loadhostkey_helper("ECDSA384", (void**)&read_key->ecckey384, (void**)&svr_opts.hostkey->ecckey384, fatal_duplicate); |
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445 } |
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446 #endif |
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447 #ifdef DROPBEAR_ECC_521 |
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448 if (type == DROPBEAR_SIGNKEY_ECDSA_NISTP521) { |
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449 loadhostkey_helper("ECDSA521", (void**)&read_key->ecckey521, (void**)&svr_opts.hostkey->ecckey521, fatal_duplicate); |
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450 } |
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451 #endif |
857 | 452 #endif /* DROPBEAR_ECDSA */ |
795 | 453 sign_key_free(read_key); |
454 TRACE(("leave loadhostkey")) | |
455 } | |
456 | |
457 static void addhostkey(const char *keyfile) { | |
458 if (svr_opts.num_hostkey_files >= MAX_HOSTKEYS) { | |
459 dropbear_exit("Too many hostkeys"); | |
460 } | |
461 svr_opts.hostkey_files[svr_opts.num_hostkey_files] = m_strdup(keyfile); | |
462 svr_opts.num_hostkey_files++; | |
463 } | |
464 | |
465 void load_all_hostkeys() { | |
466 int i; | |
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467 int disable_unset_keys = 1; |
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468 int any_keys = 0; |
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469 |
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470 svr_opts.hostkey = new_sign_key(); |
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471 |
795 | 472 for (i = 0; i < svr_opts.num_hostkey_files; i++) { |
473 char *hostkey_file = svr_opts.hostkey_files[i]; | |
474 loadhostkey(hostkey_file, 1); | |
475 m_free(hostkey_file); | |
476 } | |
477 | |
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478 #ifdef DROPBEAR_RSA |
795 | 479 loadhostkey(RSA_PRIV_FILENAME, 0); |
480 #endif | |
481 | |
482 #ifdef DROPBEAR_DSS | |
483 loadhostkey(DSS_PRIV_FILENAME, 0); | |
484 #endif | |
485 | |
486 #ifdef DROPBEAR_ECDSA | |
487 loadhostkey(ECDSA_PRIV_FILENAME, 0); | |
488 #endif | |
489 | |
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490 #ifdef DROPBEAR_DELAY_HOSTKEY |
876 | 491 if (svr_opts.delay_hostkey) { |
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492 disable_unset_keys = 0; |
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493 } |
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494 #endif |
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495 |
795 | 496 #ifdef DROPBEAR_RSA |
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497 if (disable_unset_keys && !svr_opts.hostkey->rsakey) { |
795 | 498 disablekey(DROPBEAR_SIGNKEY_RSA); |
876 | 499 } else { |
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500 any_keys = 1; |
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501 } |
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502 #endif |
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503 |
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504 #ifdef DROPBEAR_DSS |
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505 if (disable_unset_keys && !svr_opts.hostkey->dsskey) { |
876 | 506 disablekey(DROPBEAR_SIGNKEY_DSS); |
507 } else { | |
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508 any_keys = 1; |
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509 } |
795 | 510 #endif |
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511 |
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512 |
795 | 513 #ifdef DROPBEAR_ECDSA |
514 #ifdef DROPBEAR_ECC_256 | |
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515 if ((disable_unset_keys || ECDSA_DEFAULT_SIZE != 256) |
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516 && !svr_opts.hostkey->ecckey256) { |
795 | 517 disablekey(DROPBEAR_SIGNKEY_ECDSA_NISTP256); |
876 | 518 } else { |
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519 any_keys = 1; |
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520 } |
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521 #endif |
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522 |
795 | 523 #ifdef DROPBEAR_ECC_384 |
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524 if ((disable_unset_keys || ECDSA_DEFAULT_SIZE != 384) |
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525 && !svr_opts.hostkey->ecckey384) { |
795 | 526 disablekey(DROPBEAR_SIGNKEY_ECDSA_NISTP384); |
876 | 527 } else { |
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528 any_keys = 1; |
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529 } |
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530 #endif |
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531 |
795 | 532 #ifdef DROPBEAR_ECC_521 |
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533 if ((disable_unset_keys || ECDSA_DEFAULT_SIZE != 521) |
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534 && !svr_opts.hostkey->ecckey521) { |
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535 disablekey(DROPBEAR_SIGNKEY_ECDSA_NISTP521); |
876 | 536 } else { |
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537 any_keys = 1; |
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538 } |
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539 #endif |
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540 #endif /* DROPBEAR_ECDSA */ |
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541 |
876 | 542 if (!any_keys) { |
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543 dropbear_exit("No hostkeys available"); |
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544 } |
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545 } |