Mercurial > dropbear
annotate cli-runopts.c @ 66:38c3146aa23d
Some more sanity-checking of args, and just warn and ignore OpenSSH args
| author | Matt Johnston <matt@ucc.asn.au> |
|---|---|
| date | Thu, 12 Aug 2004 14:19:05 +0000 |
| parents | efb5e0b335cf |
| children | eee77ac31ccc |
| 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" |
| 64 | 31 #include "tcpfwd.h" |
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32 |
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33 cli_runopts cli_opts; /* GLOBAL */ |
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34 |
| 47 | 35 static void printhelp(); |
| 36 static void parsehostname(char* userhostarg); | |
| 37 #ifdef DROPBEAR_PUBKEY_AUTH | |
| 38 static void loadidentityfile(const char* filename); | |
| 39 #endif | |
| 64 | 40 #ifdef ENABLE_CLI_ANYTCPFWD |
| 41 static void addforward(char* str, struct TCPFwdList** fwdlist); | |
| 42 #endif | |
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43 |
| 47 | 44 static void printhelp() { |
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45 |
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46 fprintf(stderr, "Dropbear client v%s\n" |
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47 "Usage: %s [options] [user@]host\n" |
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48 "Options are:\n" |
| 47 | 49 "-p <remoteport>\n" |
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50 "-t Allocate a pty\n" |
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51 "-T Don't allocate a pty\n" |
| 47 | 52 #ifdef DROPBEAR_PUBKEY_AUTH |
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53 "-i <identityfile> (multiple allowed)\n" |
| 47 | 54 #endif |
| 64 | 55 #ifdef ENABLE_CLI_LOCALTCPFWD |
| 62 | 56 "-L <listenport:remotehsot:reportport> Local port forwarding\n" |
| 57 #endif | |
| 64 | 58 #ifdef ENABLE_CLI_REMOTETCPFWD |
| 62 | 59 "-R <listenport:remotehost:remoteport> Remote port forwarding\n" |
| 60 #endif | |
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61 "-l <username>\n" |
| 47 | 62 ,DROPBEAR_VERSION, cli_opts.progname); |
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63 } |
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64 |
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65 void cli_getopts(int argc, char ** argv) { |
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66 |
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67 unsigned int i, j; |
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68 char ** next = 0; |
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69 unsigned int cmdlen; |
| 47 | 70 #ifdef DROPBEAR_PUBKEY_AUTH |
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71 int nextiskey = 0; /* A flag if the next argument is a keyfile */ |
| 47 | 72 #endif |
| 64 | 73 #ifdef ENABLE_CLI_LOCALTCPFWD |
| 62 | 74 int nextislocal = 0; |
| 75 #endif | |
| 64 | 76 #ifdef ENABLE_CLI_REMOTETCPFWD |
| 62 | 77 int nextisremote = 0; |
| 78 #endif | |
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79 char* dummy = NULL; /* Not used for anything real */ |
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80 |
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81 /* see printhelp() for options */ |
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82 cli_opts.progname = argv[0]; |
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83 cli_opts.remotehost = NULL; |
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84 cli_opts.remoteport = NULL; |
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85 cli_opts.username = NULL; |
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86 cli_opts.cmd = NULL; |
| 47 | 87 cli_opts.wantpty = 9; /* 9 means "it hasn't been touched", gets set later */ |
| 88 #ifdef DROPBEAR_PUBKEY_AUTH | |
| 89 cli_opts.pubkeys = NULL; | |
| 90 #endif | |
| 64 | 91 #ifdef ENABLE_CLI_LOCALTCPFWD |
| 92 cli_opts.localfwds = NULL; | |
| 62 | 93 #endif |
| 64 | 94 #ifdef ENABLE_CLI_REMOTETCPFWD |
| 95 cli_opts.remotefwds = NULL; | |
| 62 | 96 #endif |
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97 opts.nolocaltcp = 0; |
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98 opts.noremotetcp = 0; |
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99 /* not yet |
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100 opts.ipv4 = 1; |
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101 opts.ipv6 = 1; |
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102 */ |
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103 |
| 47 | 104 /* Iterate all the arguments */ |
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105 for (i = 1; i < (unsigned int)argc; i++) { |
| 47 | 106 #ifdef DROPBEAR_PUBKEY_AUTH |
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107 if (nextiskey) { |
| 47 | 108 /* Load a hostkey since the previous argument was "-i" */ |
| 109 loadidentityfile(argv[i]); | |
| 110 nextiskey = 0; | |
| 111 continue; | |
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112 } |
| 47 | 113 #endif |
| 64 | 114 #ifdef ENABLE_CLI_REMOTETCPFWD |
| 115 if (nextisremote) { | |
| 116 TRACE(("nextisremote true")); | |
| 117 addforward(argv[i], &cli_opts.remotefwds); | |
| 118 nextisremote = 0; | |
| 119 continue; | |
| 120 } | |
| 121 #endif | |
| 122 #ifdef ENABLE_CLI_LOCALTCPFWD | |
| 123 if (nextislocal) { | |
| 124 TRACE(("nextislocal true")); | |
| 125 addforward(argv[i], &cli_opts.localfwds); | |
| 126 nextislocal = 0; | |
| 127 continue; | |
| 128 } | |
| 129 #endif | |
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130 if (next) { |
| 47 | 131 /* The previous flag set a value to assign */ |
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132 *next = argv[i]; |
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133 if (*next == NULL) { |
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134 dropbear_exit("Invalid null argument"); |
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135 } |
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136 next = NULL; |
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137 continue; |
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138 } |
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139 |
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140 if (argv[i][0] == '-') { |
| 47 | 141 /* A flag *waves* */ |
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142 |
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143 if (strlen(argv[i]) > 2) { |
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144 fprintf(stderr, |
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145 "WARNING: Ignoring unknown argument '%s'\n", argv[i]); |
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146 continue; |
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147 } |
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148 |
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149 switch (argv[i][1]) { |
| 47 | 150 case 'p': /* remoteport */ |
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151 next = &cli_opts.remoteport; |
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152 break; |
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153 #ifdef DROPBEAR_PUBKEY_AUTH |
| 47 | 154 case 'i': /* an identityfile */ |
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155 nextiskey = 1; |
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156 break; |
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157 #endif |
| 47 | 158 case 't': /* we want a pty */ |
| 159 cli_opts.wantpty = 1; | |
| 160 break; | |
| 161 case 'T': /* don't want a pty */ | |
| 162 cli_opts.wantpty = 0; | |
| 163 break; | |
| 64 | 164 #ifdef ENABLE_CLI_LOCALTCPFWD |
| 165 case 'L': | |
| 166 nextislocal = 1; | |
| 167 break; | |
| 168 #endif | |
| 169 #ifdef ENABLE_CLI_REMOTETCPFWD | |
| 170 case 'R': | |
| 171 nextisremote = 1; | |
| 172 break; | |
| 173 #endif | |
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174 case 'l': |
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175 next = &cli_opts.username; |
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176 break; |
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177 case 'h': |
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178 printhelp(); |
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179 exit(EXIT_SUCCESS); |
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180 break; |
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181 case 'F': |
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182 case 'e': |
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183 case 'c': |
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184 case 'm': |
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185 case 'D': |
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186 #ifndef ENABLE_CLI_REMOTETCPFWD |
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187 case 'R': |
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188 #endif |
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189 #ifndef ENABLE_CLI_LOCALTCPFWD |
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190 case 'L': |
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191 #endif |
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192 case 'o': |
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193 case 'b': |
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194 next = &dummy; |
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195 default: |
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196 fprintf(stderr, |
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197 "WARNING: Ignoring unknown argument '%s'\n", argv[i]); |
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198 break; |
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199 } /* Switch */ |
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200 |
| 47 | 201 continue; /* next argument */ |
| 202 | |
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203 } else { |
| 64 | 204 TRACE(("non-flag arg: '%s'", argv[i])); |
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205 |
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206 /* Either the hostname or commands */ |
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207 |
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208 if (cli_opts.remotehost == NULL) { |
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209 |
| 47 | 210 parsehostname(argv[i]); |
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211 |
| 47 | 212 } else { |
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213 |
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214 /* this is part of the commands to send - after this we |
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215 * don't parse any more options, and flags are sent as the |
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216 * command */ |
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217 cmdlen = 0; |
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218 for (j = i; j < (unsigned int)argc; j++) { |
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219 cmdlen += strlen(argv[j]) + 1; /* +1 for spaces */ |
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220 } |
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221 /* Allocate the space */ |
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222 cli_opts.cmd = (char*)m_malloc(cmdlen); |
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223 cli_opts.cmd[0] = '\0'; |
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224 |
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225 /* Append all the bits */ |
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226 for (j = i; j < (unsigned int)argc; j++) { |
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227 strlcat(cli_opts.cmd, argv[j], cmdlen); |
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228 strlcat(cli_opts.cmd, " ", cmdlen); |
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229 } |
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230 /* It'll be null-terminated here */ |
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231 |
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232 /* We've eaten all the options and flags */ |
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233 break; |
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234 } |
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235 } |
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236 } |
| 47 | 237 |
| 238 if (cli_opts.remotehost == NULL) { | |
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239 printhelp(); |
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240 exit(EXIT_FAILURE); |
| 47 | 241 } |
| 242 | |
| 243 if (cli_opts.remoteport == NULL) { | |
| 244 cli_opts.remoteport = "22"; | |
| 245 } | |
| 246 | |
| 247 /* If not explicitly specified with -t or -T, we don't want a pty if | |
| 248 * there's a command, but we do otherwise */ | |
| 249 if (cli_opts.wantpty == 9) { | |
| 250 if (cli_opts.cmd == NULL) { | |
| 251 cli_opts.wantpty = 1; | |
| 252 } else { | |
| 253 cli_opts.wantpty = 0; | |
| 254 } | |
| 255 } | |
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256 } |
| 47 | 257 |
| 258 #ifdef DROPBEAR_PUBKEY_AUTH | |
| 259 static void loadidentityfile(const char* filename) { | |
| 260 | |
| 261 struct PubkeyList * nextkey; | |
| 262 sign_key *key; | |
| 263 int keytype; | |
| 264 | |
| 265 key = new_sign_key(); | |
| 266 keytype = DROPBEAR_SIGNKEY_ANY; | |
| 267 if ( readhostkey(filename, key, &keytype) != DROPBEAR_SUCCESS ) { | |
| 268 | |
| 269 fprintf(stderr, "Failed loading keyfile '%s'\n", filename); | |
| 270 sign_key_free(key); | |
| 271 | |
| 272 } else { | |
| 273 | |
| 274 nextkey = (struct PubkeyList*)m_malloc(sizeof(struct PubkeyList)); | |
| 275 nextkey->key = key; | |
| 276 nextkey->next = cli_opts.pubkeys; | |
| 277 nextkey->type = keytype; | |
| 278 cli_opts.pubkeys = nextkey; | |
| 279 } | |
| 280 } | |
| 281 #endif | |
| 282 | |
| 283 | |
| 284 /* Parses a [user@]hostname argument. userhostarg is the argv[i] corresponding | |
| 285 * - note that it will be modified */ | |
| 64 | 286 static void parsehostname(char* orighostarg) { |
| 47 | 287 |
| 288 uid_t uid; | |
| 289 struct passwd *pw = NULL; | |
| 64 | 290 char *userhostarg = NULL; |
| 291 | |
| 292 /* We probably don't want to be editing argvs */ | |
| 293 userhostarg = m_strdup(orighostarg); | |
| 47 | 294 |
| 295 cli_opts.remotehost = strchr(userhostarg, '@'); | |
| 296 if (cli_opts.remotehost == NULL) { | |
| 297 /* no username portion, the cli-auth.c code can figure the | |
| 298 * local user's name */ | |
| 299 cli_opts.remotehost = userhostarg; | |
| 300 } else { | |
| 301 cli_opts.remotehost[0] = '\0'; /* Split the user/host */ | |
| 302 cli_opts.remotehost++; | |
| 303 cli_opts.username = userhostarg; | |
| 304 } | |
| 305 | |
| 306 if (cli_opts.username == NULL) { | |
| 307 uid = getuid(); | |
| 308 | |
| 309 pw = getpwuid(uid); | |
| 310 if (pw == NULL || pw->pw_name == NULL) { | |
| 311 dropbear_exit("Unknown own user"); | |
| 312 } | |
| 313 | |
| 314 cli_opts.username = m_strdup(pw->pw_name); | |
| 315 } | |
| 316 | |
| 317 if (cli_opts.remotehost[0] == '\0') { | |
| 318 dropbear_exit("Bad hostname"); | |
| 319 } | |
| 320 } | |
| 64 | 321 |
| 322 #ifdef ENABLE_CLI_ANYTCPFWD | |
| 323 /* Turn a "listenport:remoteaddr:remoteport" string into into a forwarding | |
| 324 * set, and add it to the forwarding list */ | |
| 325 static void addforward(char* origstr, struct TCPFwdList** fwdlist) { | |
| 326 | |
| 327 char * listenport = NULL; | |
| 328 char * connectport = NULL; | |
| 329 char * connectaddr = NULL; | |
| 330 struct TCPFwdList* newfwd = NULL; | |
| 331 char * str = NULL; | |
| 332 | |
| 333 TRACE(("enter addforward")); | |
| 334 | |
| 335 /* We probably don't want to be editing argvs */ | |
| 336 str = m_strdup(origstr); | |
| 337 | |
| 338 listenport = str; | |
| 339 | |
| 340 connectaddr = strchr(str, ':'); | |
| 341 if (connectaddr == NULL) { | |
| 342 TRACE(("connectaddr == NULL")); | |
| 343 goto fail; | |
| 344 } | |
| 345 | |
| 346 connectaddr[0] = '\0'; | |
| 347 connectaddr++; | |
| 348 | |
| 349 connectport = strchr(connectaddr, ':'); | |
| 350 if (connectport == NULL) { | |
| 351 TRACE(("connectport == NULL")); | |
| 352 goto fail; | |
| 353 } | |
| 354 | |
| 355 connectport[0] = '\0'; | |
| 356 connectport++; | |
| 357 | |
| 358 newfwd = (struct TCPFwdList*)m_malloc(sizeof(struct TCPFwdList)); | |
| 359 | |
| 360 /* Now we check the ports - note that the port ints are unsigned, | |
| 361 * the check later only checks for >= MAX_PORT */ | |
| 362 newfwd->listenport = strtol(listenport, NULL, 10); | |
| 363 if (errno != 0) { | |
| 364 TRACE(("bad listenport strtol")); | |
| 365 goto fail; | |
| 366 } | |
| 367 | |
| 368 newfwd->connectport = strtol(connectport, NULL, 10); | |
| 369 if (errno != 0) { | |
| 370 TRACE(("bad connectport strtol")); | |
| 371 goto fail; | |
| 372 } | |
| 373 | |
| 374 newfwd->connectaddr = connectaddr; | |
| 375 | |
| 376 if (newfwd->listenport > 65535) { | |
| 377 TRACE(("listenport > 65535")); | |
| 378 goto badport; | |
| 379 } | |
| 380 | |
| 381 if (newfwd->connectport > 65535) { | |
| 382 TRACE(("connectport > 65535")); | |
| 383 goto badport; | |
| 384 } | |
| 385 | |
| 386 newfwd->next = *fwdlist; | |
| 387 *fwdlist = newfwd; | |
| 388 | |
| 389 TRACE(("leave addforward: done")); | |
| 390 return; | |
| 391 | |
| 392 fail: | |
| 393 dropbear_exit("Bad TCP forward '%s'", origstr); | |
| 394 | |
| 395 badport: | |
| 396 dropbear_exit("Bad TCP port in '%s'", origstr); | |
| 397 } | |
| 398 #endif |