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8efc0c15 | 1 | /* |
5260325f | 2 | * Author: Tatu Ylonen <ylo@cs.hut.fi> |
5260325f | 3 | * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland |
4 | * All rights reserved | |
5260325f | 5 | * Functions for reading the configuration files. |
6ae2364d | 6 | * |
bcbf86ec | 7 | * As far as I am concerned, the code I have written for this software |
8 | * can be used freely for any purpose. Any derived versions of this | |
9 | * software must be clearly marked as such, and if the derived work is | |
10 | * incompatible with the protocol description in the RFC file, it must be | |
11 | * called by a name other than "ssh" or "Secure Shell". | |
5260325f | 12 | */ |
8efc0c15 | 13 | |
14 | #include "includes.h" | |
b7c70970 | 15 | RCSID("$OpenBSD: readconf.c,v 1.75 2001/04/15 21:28:35 stevesk Exp $"); |
8efc0c15 | 16 | |
17 | #include "ssh.h" | |
8efc0c15 | 18 | #include "xmalloc.h" |
a8be9f80 | 19 | #include "compat.h" |
42f11eb2 | 20 | #include "cipher.h" |
21 | #include "pathnames.h" | |
22 | #include "log.h" | |
23 | #include "readconf.h" | |
24 | #include "match.h" | |
25 | #include "misc.h" | |
b2552997 | 26 | #include "kex.h" |
27 | #include "mac.h" | |
8efc0c15 | 28 | |
29 | /* Format of the configuration file: | |
30 | ||
31 | # Configuration data is parsed as follows: | |
32 | # 1. command line options | |
33 | # 2. user-specific file | |
34 | # 3. system-wide file | |
35 | # Any configuration value is only changed the first time it is set. | |
36 | # Thus, host-specific definitions should be at the beginning of the | |
37 | # configuration file, and defaults at the end. | |
38 | ||
39 | # Host-specific declarations. These may override anything above. A single | |
40 | # host may match multiple declarations; these are processed in the order | |
41 | # that they are given in. | |
42 | ||
43 | Host *.ngs.fi ngs.fi | |
44 | FallBackToRsh no | |
45 | ||
46 | Host fake.com | |
47 | HostName another.host.name.real.org | |
48 | User blaah | |
49 | Port 34289 | |
50 | ForwardX11 no | |
51 | ForwardAgent no | |
52 | ||
53 | Host books.com | |
54 | RemoteForward 9999 shadows.cs.hut.fi:9999 | |
55 | Cipher 3des | |
56 | ||
57 | Host fascist.blob.com | |
58 | Port 23123 | |
59 | User tylonen | |
60 | RhostsAuthentication no | |
61 | PasswordAuthentication no | |
62 | ||
63 | Host puukko.hut.fi | |
64 | User t35124p | |
65 | ProxyCommand ssh-proxy %h %p | |
66 | ||
67 | Host *.fr | |
68 | UseRsh yes | |
69 | ||
70 | Host *.su | |
71 | Cipher none | |
72 | PasswordAuthentication no | |
73 | ||
74 | # Defaults for various options | |
75 | Host * | |
76 | ForwardAgent no | |
fa08c86b | 77 | ForwardX11 no |
8efc0c15 | 78 | RhostsAuthentication yes |
79 | PasswordAuthentication yes | |
80 | RSAAuthentication yes | |
81 | RhostsRSAAuthentication yes | |
82 | FallBackToRsh no | |
83 | UseRsh no | |
84 | StrictHostKeyChecking yes | |
85 | KeepAlives no | |
86 | IdentityFile ~/.ssh/identity | |
87 | Port 22 | |
88 | EscapeChar ~ | |
89 | ||
90 | */ | |
91 | ||
92 | /* Keyword tokens. */ | |
93 | ||
5260325f | 94 | typedef enum { |
95 | oBadOption, | |
96 | oForwardAgent, oForwardX11, oGatewayPorts, oRhostsAuthentication, | |
97 | oPasswordAuthentication, oRSAAuthentication, oFallBackToRsh, oUseRsh, | |
d464095c | 98 | oChallengeResponseAuthentication, oXAuthLocation, |
8efc0c15 | 99 | #ifdef KRB4 |
5260325f | 100 | oKerberosAuthentication, |
8efc0c15 | 101 | #endif /* KRB4 */ |
102 | #ifdef AFS | |
5260325f | 103 | oKerberosTgtPassing, oAFSTokenPassing, |
8efc0c15 | 104 | #endif |
5260325f | 105 | oIdentityFile, oHostName, oPort, oCipher, oRemoteForward, oLocalForward, |
106 | oUser, oHost, oEscapeChar, oRhostsRSAAuthentication, oProxyCommand, | |
107 | oGlobalKnownHostsFile, oUserKnownHostsFile, oConnectionAttempts, | |
108 | oBatchMode, oCheckHostIP, oStrictHostKeyChecking, oCompression, | |
d464095c | 109 | oCompressionLevel, oKeepAlives, oNumberOfPasswordPrompts, |
b2552997 | 110 | oUsePrivilegedPort, oLogLevel, oCiphers, oProtocol, oMacs, |
fa08c86b | 111 | oGlobalKnownHostsFile2, oUserKnownHostsFile2, oPubkeyAuthentication, |
cab80f75 | 112 | oKbdInteractiveAuthentication, oKbdInteractiveDevices, oHostKeyAlias, |
8002af61 | 113 | oDynamicForward, oPreferredAuthentications, oHostbasedAuthentication |
8efc0c15 | 114 | } OpCodes; |
115 | ||
116 | /* Textual representations of the tokens. */ | |
117 | ||
5260325f | 118 | static struct { |
119 | const char *name; | |
120 | OpCodes opcode; | |
121 | } keywords[] = { | |
122 | { "forwardagent", oForwardAgent }, | |
123 | { "forwardx11", oForwardX11 }, | |
fa649821 | 124 | { "xauthlocation", oXAuthLocation }, |
5260325f | 125 | { "gatewayports", oGatewayPorts }, |
126 | { "useprivilegedport", oUsePrivilegedPort }, | |
127 | { "rhostsauthentication", oRhostsAuthentication }, | |
128 | { "passwordauthentication", oPasswordAuthentication }, | |
94ec8c6b | 129 | { "kbdinteractiveauthentication", oKbdInteractiveAuthentication }, |
130 | { "kbdinteractivedevices", oKbdInteractiveDevices }, | |
5260325f | 131 | { "rsaauthentication", oRSAAuthentication }, |
fa08c86b | 132 | { "pubkeyauthentication", oPubkeyAuthentication }, |
d464095c | 133 | { "dsaauthentication", oPubkeyAuthentication }, /* alias */ |
8002af61 | 134 | { "rhostsrsaauthentication", oRhostsRSAAuthentication }, |
0140e66a | 135 | { "hostbasedauthentication", oHostbasedAuthentication }, |
d464095c | 136 | { "challengeresponseauthentication", oChallengeResponseAuthentication }, |
137 | { "skeyauthentication", oChallengeResponseAuthentication }, /* alias */ | |
138 | { "tisauthentication", oChallengeResponseAuthentication }, /* alias */ | |
8efc0c15 | 139 | #ifdef KRB4 |
5260325f | 140 | { "kerberosauthentication", oKerberosAuthentication }, |
8efc0c15 | 141 | #endif /* KRB4 */ |
142 | #ifdef AFS | |
5260325f | 143 | { "kerberostgtpassing", oKerberosTgtPassing }, |
144 | { "afstokenpassing", oAFSTokenPassing }, | |
8efc0c15 | 145 | #endif |
5260325f | 146 | { "fallbacktorsh", oFallBackToRsh }, |
147 | { "usersh", oUseRsh }, | |
148 | { "identityfile", oIdentityFile }, | |
fa08c86b | 149 | { "identityfile2", oIdentityFile }, /* alias */ |
5260325f | 150 | { "hostname", oHostName }, |
8abcdba4 | 151 | { "hostkeyalias", oHostKeyAlias }, |
5260325f | 152 | { "proxycommand", oProxyCommand }, |
153 | { "port", oPort }, | |
154 | { "cipher", oCipher }, | |
a8be9f80 | 155 | { "ciphers", oCiphers }, |
b2552997 | 156 | { "macs", oMacs }, |
a8be9f80 | 157 | { "protocol", oProtocol }, |
5260325f | 158 | { "remoteforward", oRemoteForward }, |
159 | { "localforward", oLocalForward }, | |
160 | { "user", oUser }, | |
161 | { "host", oHost }, | |
162 | { "escapechar", oEscapeChar }, | |
5260325f | 163 | { "globalknownhostsfile", oGlobalKnownHostsFile }, |
164 | { "userknownhostsfile", oUserKnownHostsFile }, | |
a306f2dd | 165 | { "globalknownhostsfile2", oGlobalKnownHostsFile2 }, |
166 | { "userknownhostsfile2", oUserKnownHostsFile2 }, | |
5260325f | 167 | { "connectionattempts", oConnectionAttempts }, |
168 | { "batchmode", oBatchMode }, | |
169 | { "checkhostip", oCheckHostIP }, | |
170 | { "stricthostkeychecking", oStrictHostKeyChecking }, | |
171 | { "compression", oCompression }, | |
172 | { "compressionlevel", oCompressionLevel }, | |
173 | { "keepalive", oKeepAlives }, | |
174 | { "numberofpasswordprompts", oNumberOfPasswordPrompts }, | |
5260325f | 175 | { "loglevel", oLogLevel }, |
0490e609 | 176 | { "dynamicforward", oDynamicForward }, |
cab80f75 | 177 | { "preferredauthentications", oPreferredAuthentications }, |
5260325f | 178 | { NULL, 0 } |
6a17f9c2 | 179 | }; |
180 | ||
aa3378df | 181 | /* |
182 | * Adds a local TCP/IP port forward to options. Never returns if there is an | |
183 | * error. | |
184 | */ | |
8efc0c15 | 185 | |
6ae2364d | 186 | void |
57112b5a | 187 | add_local_forward(Options *options, u_short port, const char *host, |
188 | u_short host_port) | |
8efc0c15 | 189 | { |
5260325f | 190 | Forward *fwd; |
3c62e7eb | 191 | #ifndef HAVE_CYGWIN |
5260325f | 192 | extern uid_t original_real_uid; |
5260325f | 193 | if (port < IPPORT_RESERVED && original_real_uid != 0) |
54b974dc | 194 | fatal("Privileged ports can only be forwarded by root."); |
3c62e7eb | 195 | #endif |
5260325f | 196 | if (options->num_local_forwards >= SSH_MAX_FORWARDS_PER_DIRECTION) |
197 | fatal("Too many local forwards (max %d).", SSH_MAX_FORWARDS_PER_DIRECTION); | |
198 | fwd = &options->local_forwards[options->num_local_forwards++]; | |
199 | fwd->port = port; | |
200 | fwd->host = xstrdup(host); | |
201 | fwd->host_port = host_port; | |
8efc0c15 | 202 | } |
203 | ||
aa3378df | 204 | /* |
205 | * Adds a remote TCP/IP port forward to options. Never returns if there is | |
206 | * an error. | |
207 | */ | |
8efc0c15 | 208 | |
6ae2364d | 209 | void |
57112b5a | 210 | add_remote_forward(Options *options, u_short port, const char *host, |
211 | u_short host_port) | |
8efc0c15 | 212 | { |
5260325f | 213 | Forward *fwd; |
214 | if (options->num_remote_forwards >= SSH_MAX_FORWARDS_PER_DIRECTION) | |
215 | fatal("Too many remote forwards (max %d).", | |
216 | SSH_MAX_FORWARDS_PER_DIRECTION); | |
217 | fwd = &options->remote_forwards[options->num_remote_forwards++]; | |
218 | fwd->port = port; | |
219 | fwd->host = xstrdup(host); | |
220 | fwd->host_port = host_port; | |
8efc0c15 | 221 | } |
222 | ||
aa3378df | 223 | /* |
6be9a5e8 | 224 | * Returns the number of the token pointed to by cp or oBadOption. |
aa3378df | 225 | */ |
8efc0c15 | 226 | |
6ae2364d | 227 | static OpCodes |
5260325f | 228 | parse_token(const char *cp, const char *filename, int linenum) |
8efc0c15 | 229 | { |
1e3b8b07 | 230 | u_int i; |
8efc0c15 | 231 | |
5260325f | 232 | for (i = 0; keywords[i].name; i++) |
aa3378df | 233 | if (strcasecmp(cp, keywords[i].name) == 0) |
5260325f | 234 | return keywords[i].opcode; |
8efc0c15 | 235 | |
b7c70970 | 236 | error("%s: line %d: Bad configuration option: %s", |
237 | filename, linenum, cp); | |
5260325f | 238 | return oBadOption; |
8efc0c15 | 239 | } |
240 | ||
aa3378df | 241 | /* |
242 | * Processes a single option line as used in the configuration files. This | |
243 | * only sets those values that have not already been set. | |
244 | */ | |
8efc0c15 | 245 | |
e7c0f9d5 | 246 | int |
247 | process_config_line(Options *options, const char *host, | |
5260325f | 248 | char *line, const char *filename, int linenum, |
249 | int *activep) | |
8efc0c15 | 250 | { |
089fbbd2 | 251 | char buf[256], *s, *string, **charptr, *endofnumber, *keyword, *arg; |
57112b5a | 252 | int opcode, *intptr, value; |
253 | u_short fwd_port, fwd_host_port; | |
5260325f | 254 | |
704b1659 | 255 | s = line; |
256 | /* Get the keyword. (Each line is supposed to begin with a keyword). */ | |
257 | keyword = strdelim(&s); | |
258 | /* Ignore leading whitespace. */ | |
259 | if (*keyword == '\0') | |
260 | keyword = strdelim(&s); | |
42f11eb2 | 261 | if (keyword == NULL || !*keyword || *keyword == '\n' || *keyword == '#') |
5260325f | 262 | return 0; |
263 | ||
089fbbd2 | 264 | opcode = parse_token(keyword, filename, linenum); |
5260325f | 265 | |
266 | switch (opcode) { | |
267 | case oBadOption: | |
aa3378df | 268 | /* don't panic, but count bad options */ |
269 | return -1; | |
5260325f | 270 | /* NOTREACHED */ |
271 | case oForwardAgent: | |
272 | intptr = &options->forward_agent; | |
273 | parse_flag: | |
704b1659 | 274 | arg = strdelim(&s); |
089fbbd2 | 275 | if (!arg || *arg == '\0') |
5260325f | 276 | fatal("%.200s line %d: Missing yes/no argument.", filename, linenum); |
277 | value = 0; /* To avoid compiler warning... */ | |
089fbbd2 | 278 | if (strcmp(arg, "yes") == 0 || strcmp(arg, "true") == 0) |
5260325f | 279 | value = 1; |
089fbbd2 | 280 | else if (strcmp(arg, "no") == 0 || strcmp(arg, "false") == 0) |
5260325f | 281 | value = 0; |
282 | else | |
283 | fatal("%.200s line %d: Bad yes/no argument.", filename, linenum); | |
284 | if (*activep && *intptr == -1) | |
285 | *intptr = value; | |
286 | break; | |
287 | ||
288 | case oForwardX11: | |
289 | intptr = &options->forward_x11; | |
290 | goto parse_flag; | |
291 | ||
292 | case oGatewayPorts: | |
293 | intptr = &options->gateway_ports; | |
294 | goto parse_flag; | |
295 | ||
296 | case oUsePrivilegedPort: | |
297 | intptr = &options->use_privileged_port; | |
298 | goto parse_flag; | |
299 | ||
300 | case oRhostsAuthentication: | |
301 | intptr = &options->rhosts_authentication; | |
302 | goto parse_flag; | |
303 | ||
304 | case oPasswordAuthentication: | |
305 | intptr = &options->password_authentication; | |
306 | goto parse_flag; | |
307 | ||
94ec8c6b | 308 | case oKbdInteractiveAuthentication: |
309 | intptr = &options->kbd_interactive_authentication; | |
310 | goto parse_flag; | |
311 | ||
312 | case oKbdInteractiveDevices: | |
313 | charptr = &options->kbd_interactive_devices; | |
314 | goto parse_string; | |
315 | ||
fa08c86b | 316 | case oPubkeyAuthentication: |
317 | intptr = &options->pubkey_authentication; | |
1d1ffb87 | 318 | goto parse_flag; |
319 | ||
5260325f | 320 | case oRSAAuthentication: |
321 | intptr = &options->rsa_authentication; | |
322 | goto parse_flag; | |
323 | ||
324 | case oRhostsRSAAuthentication: | |
325 | intptr = &options->rhosts_rsa_authentication; | |
326 | goto parse_flag; | |
327 | ||
8002af61 | 328 | case oHostbasedAuthentication: |
329 | intptr = &options->hostbased_authentication; | |
330 | goto parse_flag; | |
331 | ||
d464095c | 332 | case oChallengeResponseAuthentication: |
333 | intptr = &options->challenge_reponse_authentication; | |
5260325f | 334 | goto parse_flag; |
8efc0c15 | 335 | |
336 | #ifdef KRB4 | |
5260325f | 337 | case oKerberosAuthentication: |
338 | intptr = &options->kerberos_authentication; | |
339 | goto parse_flag; | |
8efc0c15 | 340 | #endif /* KRB4 */ |
341 | ||
342 | #ifdef AFS | |
5260325f | 343 | case oKerberosTgtPassing: |
344 | intptr = &options->kerberos_tgt_passing; | |
345 | goto parse_flag; | |
8efc0c15 | 346 | |
5260325f | 347 | case oAFSTokenPassing: |
348 | intptr = &options->afs_token_passing; | |
349 | goto parse_flag; | |
8efc0c15 | 350 | #endif |
5260325f | 351 | |
352 | case oFallBackToRsh: | |
353 | intptr = &options->fallback_to_rsh; | |
354 | goto parse_flag; | |
355 | ||
356 | case oUseRsh: | |
357 | intptr = &options->use_rsh; | |
358 | goto parse_flag; | |
359 | ||
360 | case oBatchMode: | |
361 | intptr = &options->batch_mode; | |
362 | goto parse_flag; | |
363 | ||
364 | case oCheckHostIP: | |
365 | intptr = &options->check_host_ip; | |
366 | goto parse_flag; | |
367 | ||
368 | case oStrictHostKeyChecking: | |
369 | intptr = &options->strict_host_key_checking; | |
704b1659 | 370 | arg = strdelim(&s); |
089fbbd2 | 371 | if (!arg || *arg == '\0') |
c76c8819 | 372 | fatal("%.200s line %d: Missing yes/no/ask argument.", |
5260325f | 373 | filename, linenum); |
374 | value = 0; /* To avoid compiler warning... */ | |
089fbbd2 | 375 | if (strcmp(arg, "yes") == 0 || strcmp(arg, "true") == 0) |
5260325f | 376 | value = 1; |
089fbbd2 | 377 | else if (strcmp(arg, "no") == 0 || strcmp(arg, "false") == 0) |
5260325f | 378 | value = 0; |
089fbbd2 | 379 | else if (strcmp(arg, "ask") == 0) |
5260325f | 380 | value = 2; |
381 | else | |
382 | fatal("%.200s line %d: Bad yes/no/ask argument.", filename, linenum); | |
383 | if (*activep && *intptr == -1) | |
384 | *intptr = value; | |
385 | break; | |
386 | ||
387 | case oCompression: | |
388 | intptr = &options->compression; | |
389 | goto parse_flag; | |
390 | ||
391 | case oKeepAlives: | |
392 | intptr = &options->keepalives; | |
393 | goto parse_flag; | |
394 | ||
395 | case oNumberOfPasswordPrompts: | |
396 | intptr = &options->number_of_password_prompts; | |
397 | goto parse_int; | |
398 | ||
399 | case oCompressionLevel: | |
400 | intptr = &options->compression_level; | |
401 | goto parse_int; | |
402 | ||
403 | case oIdentityFile: | |
704b1659 | 404 | arg = strdelim(&s); |
089fbbd2 | 405 | if (!arg || *arg == '\0') |
5260325f | 406 | fatal("%.200s line %d: Missing argument.", filename, linenum); |
407 | if (*activep) { | |
fa08c86b | 408 | intptr = &options->num_identity_files; |
a306f2dd | 409 | if (*intptr >= SSH_MAX_IDENTITY_FILES) |
5260325f | 410 | fatal("%.200s line %d: Too many identity files specified (max %d).", |
411 | filename, linenum, SSH_MAX_IDENTITY_FILES); | |
fa08c86b | 412 | charptr = &options->identity_files[*intptr]; |
089fbbd2 | 413 | *charptr = xstrdup(arg); |
a306f2dd | 414 | *intptr = *intptr + 1; |
5260325f | 415 | } |
416 | break; | |
417 | ||
fa649821 | 418 | case oXAuthLocation: |
419 | charptr=&options->xauth_location; | |
420 | goto parse_string; | |
421 | ||
5260325f | 422 | case oUser: |
423 | charptr = &options->user; | |
424 | parse_string: | |
704b1659 | 425 | arg = strdelim(&s); |
089fbbd2 | 426 | if (!arg || *arg == '\0') |
5260325f | 427 | fatal("%.200s line %d: Missing argument.", filename, linenum); |
428 | if (*activep && *charptr == NULL) | |
089fbbd2 | 429 | *charptr = xstrdup(arg); |
5260325f | 430 | break; |
431 | ||
432 | case oGlobalKnownHostsFile: | |
433 | charptr = &options->system_hostfile; | |
434 | goto parse_string; | |
435 | ||
436 | case oUserKnownHostsFile: | |
437 | charptr = &options->user_hostfile; | |
438 | goto parse_string; | |
439 | ||
a306f2dd | 440 | case oGlobalKnownHostsFile2: |
441 | charptr = &options->system_hostfile2; | |
442 | goto parse_string; | |
443 | ||
444 | case oUserKnownHostsFile2: | |
445 | charptr = &options->user_hostfile2; | |
446 | goto parse_string; | |
447 | ||
5260325f | 448 | case oHostName: |
449 | charptr = &options->hostname; | |
450 | goto parse_string; | |
451 | ||
8abcdba4 | 452 | case oHostKeyAlias: |
453 | charptr = &options->host_key_alias; | |
454 | goto parse_string; | |
455 | ||
cab80f75 | 456 | case oPreferredAuthentications: |
457 | charptr = &options->preferred_authentications; | |
458 | goto parse_string; | |
459 | ||
5260325f | 460 | case oProxyCommand: |
461 | charptr = &options->proxy_command; | |
462 | string = xstrdup(""); | |
704b1659 | 463 | while ((arg = strdelim(&s)) != NULL && *arg != '\0') { |
089fbbd2 | 464 | string = xrealloc(string, strlen(string) + strlen(arg) + 2); |
5260325f | 465 | strcat(string, " "); |
089fbbd2 | 466 | strcat(string, arg); |
5260325f | 467 | } |
468 | if (*activep && *charptr == NULL) | |
469 | *charptr = string; | |
470 | else | |
471 | xfree(string); | |
472 | return 0; | |
473 | ||
474 | case oPort: | |
475 | intptr = &options->port; | |
476 | parse_int: | |
704b1659 | 477 | arg = strdelim(&s); |
089fbbd2 | 478 | if (!arg || *arg == '\0') |
5260325f | 479 | fatal("%.200s line %d: Missing argument.", filename, linenum); |
089fbbd2 | 480 | if (arg[0] < '0' || arg[0] > '9') |
5260325f | 481 | fatal("%.200s line %d: Bad number.", filename, linenum); |
aa3378df | 482 | |
483 | /* Octal, decimal, or hex format? */ | |
089fbbd2 | 484 | value = strtol(arg, &endofnumber, 0); |
485 | if (arg == endofnumber) | |
aa3378df | 486 | fatal("%.200s line %d: Bad number.", filename, linenum); |
5260325f | 487 | if (*activep && *intptr == -1) |
488 | *intptr = value; | |
489 | break; | |
490 | ||
491 | case oConnectionAttempts: | |
492 | intptr = &options->connection_attempts; | |
493 | goto parse_int; | |
494 | ||
495 | case oCipher: | |
496 | intptr = &options->cipher; | |
704b1659 | 497 | arg = strdelim(&s); |
089fbbd2 | 498 | if (!arg || *arg == '\0') |
71276795 | 499 | fatal("%.200s line %d: Missing argument.", filename, linenum); |
089fbbd2 | 500 | value = cipher_number(arg); |
5260325f | 501 | if (value == -1) |
502 | fatal("%.200s line %d: Bad cipher '%s'.", | |
089fbbd2 | 503 | filename, linenum, arg ? arg : "<NONE>"); |
5260325f | 504 | if (*activep && *intptr == -1) |
505 | *intptr = value; | |
506 | break; | |
507 | ||
a8be9f80 | 508 | case oCiphers: |
704b1659 | 509 | arg = strdelim(&s); |
089fbbd2 | 510 | if (!arg || *arg == '\0') |
71276795 | 511 | fatal("%.200s line %d: Missing argument.", filename, linenum); |
089fbbd2 | 512 | if (!ciphers_valid(arg)) |
d0c832f3 | 513 | fatal("%.200s line %d: Bad SSH2 cipher spec '%s'.", |
089fbbd2 | 514 | filename, linenum, arg ? arg : "<NONE>"); |
a8be9f80 | 515 | if (*activep && options->ciphers == NULL) |
089fbbd2 | 516 | options->ciphers = xstrdup(arg); |
a8be9f80 | 517 | break; |
518 | ||
b2552997 | 519 | case oMacs: |
520 | arg = strdelim(&s); | |
521 | if (!arg || *arg == '\0') | |
522 | fatal("%.200s line %d: Missing argument.", filename, linenum); | |
523 | if (!mac_valid(arg)) | |
524 | fatal("%.200s line %d: Bad SSH2 Mac spec '%s'.", | |
525 | filename, linenum, arg ? arg : "<NONE>"); | |
526 | if (*activep && options->macs == NULL) | |
527 | options->macs = xstrdup(arg); | |
528 | break; | |
529 | ||
a8be9f80 | 530 | case oProtocol: |
531 | intptr = &options->protocol; | |
704b1659 | 532 | arg = strdelim(&s); |
089fbbd2 | 533 | if (!arg || *arg == '\0') |
71276795 | 534 | fatal("%.200s line %d: Missing argument.", filename, linenum); |
089fbbd2 | 535 | value = proto_spec(arg); |
a8be9f80 | 536 | if (value == SSH_PROTO_UNKNOWN) |
537 | fatal("%.200s line %d: Bad protocol spec '%s'.", | |
089fbbd2 | 538 | filename, linenum, arg ? arg : "<NONE>"); |
a8be9f80 | 539 | if (*activep && *intptr == SSH_PROTO_UNKNOWN) |
540 | *intptr = value; | |
541 | break; | |
542 | ||
5260325f | 543 | case oLogLevel: |
544 | intptr = (int *) &options->log_level; | |
704b1659 | 545 | arg = strdelim(&s); |
089fbbd2 | 546 | value = log_level_number(arg); |
5260325f | 547 | if (value == (LogLevel) - 1) |
54b974dc | 548 | fatal("%.200s line %d: unsupported log level '%s'", |
089fbbd2 | 549 | filename, linenum, arg ? arg : "<NONE>"); |
5260325f | 550 | if (*activep && (LogLevel) * intptr == -1) |
551 | *intptr = (LogLevel) value; | |
552 | break; | |
553 | ||
554 | case oRemoteForward: | |
704b1659 | 555 | arg = strdelim(&s); |
089fbbd2 | 556 | if (!arg || *arg == '\0') |
5260325f | 557 | fatal("%.200s line %d: Missing argument.", filename, linenum); |
2d2a2c65 | 558 | fwd_port = a2port(arg); |
559 | if (fwd_port == 0) | |
5260325f | 560 | fatal("%.200s line %d: Badly formatted port number.", |
561 | filename, linenum); | |
704b1659 | 562 | arg = strdelim(&s); |
089fbbd2 | 563 | if (!arg || *arg == '\0') |
5260325f | 564 | fatal("%.200s line %d: Missing second argument.", |
565 | filename, linenum); | |
089fbbd2 | 566 | if (sscanf(arg, "%255[^:]:%hu", buf, &fwd_host_port) != 2) |
5260325f | 567 | fatal("%.200s line %d: Badly formatted host:port.", |
568 | filename, linenum); | |
569 | if (*activep) | |
570 | add_remote_forward(options, fwd_port, buf, fwd_host_port); | |
571 | break; | |
572 | ||
573 | case oLocalForward: | |
704b1659 | 574 | arg = strdelim(&s); |
089fbbd2 | 575 | if (!arg || *arg == '\0') |
5260325f | 576 | fatal("%.200s line %d: Missing argument.", filename, linenum); |
2d2a2c65 | 577 | fwd_port = a2port(arg); |
578 | if (fwd_port == 0) | |
5260325f | 579 | fatal("%.200s line %d: Badly formatted port number.", |
580 | filename, linenum); | |
704b1659 | 581 | arg = strdelim(&s); |
089fbbd2 | 582 | if (!arg || *arg == '\0') |
5260325f | 583 | fatal("%.200s line %d: Missing second argument.", |
584 | filename, linenum); | |
089fbbd2 | 585 | if (sscanf(arg, "%255[^:]:%hu", buf, &fwd_host_port) != 2) |
5260325f | 586 | fatal("%.200s line %d: Badly formatted host:port.", |
587 | filename, linenum); | |
588 | if (*activep) | |
589 | add_local_forward(options, fwd_port, buf, fwd_host_port); | |
590 | break; | |
591 | ||
0490e609 | 592 | case oDynamicForward: |
593 | arg = strdelim(&s); | |
594 | if (!arg || *arg == '\0') | |
595 | fatal("%.200s line %d: Missing port argument.", | |
596 | filename, linenum); | |
2d2a2c65 | 597 | fwd_port = a2port(arg); |
598 | if (fwd_port == 0) | |
0490e609 | 599 | fatal("%.200s line %d: Badly formatted port number.", |
600 | filename, linenum); | |
0490e609 | 601 | add_local_forward(options, fwd_port, "socks4", 0); |
8002af61 | 602 | break; |
0490e609 | 603 | |
5260325f | 604 | case oHost: |
605 | *activep = 0; | |
704b1659 | 606 | while ((arg = strdelim(&s)) != NULL && *arg != '\0') |
089fbbd2 | 607 | if (match_pattern(host, arg)) { |
608 | debug("Applying options for %.100s", arg); | |
5260325f | 609 | *activep = 1; |
610 | break; | |
611 | } | |
704b1659 | 612 | /* Avoid garbage check below, as strdelim is done. */ |
5260325f | 613 | return 0; |
614 | ||
615 | case oEscapeChar: | |
616 | intptr = &options->escape_char; | |
704b1659 | 617 | arg = strdelim(&s); |
089fbbd2 | 618 | if (!arg || *arg == '\0') |
5260325f | 619 | fatal("%.200s line %d: Missing argument.", filename, linenum); |
089fbbd2 | 620 | if (arg[0] == '^' && arg[2] == 0 && |
1e3b8b07 | 621 | (u_char) arg[1] >= 64 && (u_char) arg[1] < 128) |
622 | value = (u_char) arg[1] & 31; | |
089fbbd2 | 623 | else if (strlen(arg) == 1) |
1e3b8b07 | 624 | value = (u_char) arg[0]; |
089fbbd2 | 625 | else if (strcmp(arg, "none") == 0) |
5260325f | 626 | value = -2; |
627 | else { | |
628 | fatal("%.200s line %d: Bad escape character.", | |
629 | filename, linenum); | |
630 | /* NOTREACHED */ | |
631 | value = 0; /* Avoid compiler warning. */ | |
632 | } | |
633 | if (*activep && *intptr == -1) | |
634 | *intptr = value; | |
635 | break; | |
636 | ||
637 | default: | |
638 | fatal("process_config_line: Unimplemented opcode %d", opcode); | |
639 | } | |
640 | ||
641 | /* Check that there is no garbage at end of line. */ | |
42f11eb2 | 642 | if ((arg = strdelim(&s)) != NULL && *arg != '\0') { |
089fbbd2 | 643 | fatal("%.200s line %d: garbage at end of line; \"%.200s\".", |
644 | filename, linenum, arg); | |
645 | } | |
5260325f | 646 | return 0; |
8efc0c15 | 647 | } |
648 | ||
649 | ||
aa3378df | 650 | /* |
651 | * Reads the config file and modifies the options accordingly. Options | |
652 | * should already be initialized before this call. This never returns if | |
653 | * there is an error. If the file does not exist, this returns immediately. | |
654 | */ | |
8efc0c15 | 655 | |
6ae2364d | 656 | void |
5260325f | 657 | read_config_file(const char *filename, const char *host, Options *options) |
8efc0c15 | 658 | { |
5260325f | 659 | FILE *f; |
660 | char line[1024]; | |
661 | int active, linenum; | |
662 | int bad_options = 0; | |
663 | ||
664 | /* Open the file. */ | |
665 | f = fopen(filename, "r"); | |
666 | if (!f) | |
667 | return; | |
668 | ||
669 | debug("Reading configuration data %.200s", filename); | |
670 | ||
aa3378df | 671 | /* |
672 | * Mark that we are now processing the options. This flag is turned | |
673 | * on/off by Host specifications. | |
674 | */ | |
5260325f | 675 | active = 1; |
676 | linenum = 0; | |
677 | while (fgets(line, sizeof(line), f)) { | |
678 | /* Update line number counter. */ | |
679 | linenum++; | |
680 | if (process_config_line(options, host, line, filename, linenum, &active) != 0) | |
681 | bad_options++; | |
682 | } | |
683 | fclose(f); | |
684 | if (bad_options > 0) | |
54b974dc | 685 | fatal("%s: terminating, %d bad configuration options", |
5260325f | 686 | filename, bad_options); |
8efc0c15 | 687 | } |
688 | ||
aa3378df | 689 | /* |
690 | * Initializes options to special values that indicate that they have not yet | |
691 | * been set. Read_config_file will only set options with this value. Options | |
692 | * are processed in the following order: command line, user config file, | |
693 | * system config file. Last, fill_default_options is called. | |
694 | */ | |
8efc0c15 | 695 | |
6ae2364d | 696 | void |
5260325f | 697 | initialize_options(Options * options) |
8efc0c15 | 698 | { |
5260325f | 699 | memset(options, 'X', sizeof(*options)); |
700 | options->forward_agent = -1; | |
701 | options->forward_x11 = -1; | |
fa649821 | 702 | options->xauth_location = NULL; |
5260325f | 703 | options->gateway_ports = -1; |
704 | options->use_privileged_port = -1; | |
705 | options->rhosts_authentication = -1; | |
706 | options->rsa_authentication = -1; | |
fa08c86b | 707 | options->pubkey_authentication = -1; |
d464095c | 708 | options->challenge_reponse_authentication = -1; |
8efc0c15 | 709 | #ifdef KRB4 |
5260325f | 710 | options->kerberos_authentication = -1; |
8efc0c15 | 711 | #endif |
712 | #ifdef AFS | |
5260325f | 713 | options->kerberos_tgt_passing = -1; |
714 | options->afs_token_passing = -1; | |
8efc0c15 | 715 | #endif |
5260325f | 716 | options->password_authentication = -1; |
94ec8c6b | 717 | options->kbd_interactive_authentication = -1; |
718 | options->kbd_interactive_devices = NULL; | |
5260325f | 719 | options->rhosts_rsa_authentication = -1; |
8002af61 | 720 | options->hostbased_authentication = -1; |
5260325f | 721 | options->fallback_to_rsh = -1; |
722 | options->use_rsh = -1; | |
723 | options->batch_mode = -1; | |
724 | options->check_host_ip = -1; | |
725 | options->strict_host_key_checking = -1; | |
726 | options->compression = -1; | |
727 | options->keepalives = -1; | |
728 | options->compression_level = -1; | |
729 | options->port = -1; | |
730 | options->connection_attempts = -1; | |
731 | options->number_of_password_prompts = -1; | |
732 | options->cipher = -1; | |
a8be9f80 | 733 | options->ciphers = NULL; |
b2552997 | 734 | options->macs = NULL; |
a8be9f80 | 735 | options->protocol = SSH_PROTO_UNKNOWN; |
5260325f | 736 | options->num_identity_files = 0; |
737 | options->hostname = NULL; | |
8abcdba4 | 738 | options->host_key_alias = NULL; |
5260325f | 739 | options->proxy_command = NULL; |
740 | options->user = NULL; | |
741 | options->escape_char = -1; | |
742 | options->system_hostfile = NULL; | |
743 | options->user_hostfile = NULL; | |
a306f2dd | 744 | options->system_hostfile2 = NULL; |
745 | options->user_hostfile2 = NULL; | |
5260325f | 746 | options->num_local_forwards = 0; |
747 | options->num_remote_forwards = 0; | |
748 | options->log_level = (LogLevel) - 1; | |
cab80f75 | 749 | options->preferred_authentications = NULL; |
8efc0c15 | 750 | } |
751 | ||
aa3378df | 752 | /* |
753 | * Called after processing other sources of option data, this fills those | |
754 | * options for which no value has been specified with their default values. | |
755 | */ | |
8efc0c15 | 756 | |
6ae2364d | 757 | void |
5260325f | 758 | fill_default_options(Options * options) |
8efc0c15 | 759 | { |
d2c46e77 | 760 | int len; |
761 | ||
5260325f | 762 | if (options->forward_agent == -1) |
71276795 | 763 | options->forward_agent = 0; |
5260325f | 764 | if (options->forward_x11 == -1) |
c8d54615 | 765 | options->forward_x11 = 0; |
fa649821 | 766 | #ifdef XAUTH_PATH |
767 | if (options->xauth_location == NULL) | |
768 | options->xauth_location = XAUTH_PATH; | |
769 | #endif /* XAUTH_PATH */ | |
5260325f | 770 | if (options->gateway_ports == -1) |
771 | options->gateway_ports = 0; | |
772 | if (options->use_privileged_port == -1) | |
d5ebca2b | 773 | options->use_privileged_port = 0; |
5260325f | 774 | if (options->rhosts_authentication == -1) |
775 | options->rhosts_authentication = 1; | |
776 | if (options->rsa_authentication == -1) | |
777 | options->rsa_authentication = 1; | |
fa08c86b | 778 | if (options->pubkey_authentication == -1) |
779 | options->pubkey_authentication = 1; | |
d464095c | 780 | if (options->challenge_reponse_authentication == -1) |
781 | options->challenge_reponse_authentication = 0; | |
8efc0c15 | 782 | #ifdef KRB4 |
5260325f | 783 | if (options->kerberos_authentication == -1) |
784 | options->kerberos_authentication = 1; | |
8efc0c15 | 785 | #endif /* KRB4 */ |
786 | #ifdef AFS | |
5260325f | 787 | if (options->kerberos_tgt_passing == -1) |
788 | options->kerberos_tgt_passing = 1; | |
789 | if (options->afs_token_passing == -1) | |
790 | options->afs_token_passing = 1; | |
8efc0c15 | 791 | #endif /* AFS */ |
5260325f | 792 | if (options->password_authentication == -1) |
793 | options->password_authentication = 1; | |
94ec8c6b | 794 | if (options->kbd_interactive_authentication == -1) |
d464095c | 795 | options->kbd_interactive_authentication = 1; |
5260325f | 796 | if (options->rhosts_rsa_authentication == -1) |
797 | options->rhosts_rsa_authentication = 1; | |
8002af61 | 798 | if (options->hostbased_authentication == -1) |
799 | options->hostbased_authentication = 0; | |
5260325f | 800 | if (options->fallback_to_rsh == -1) |
3f7a7e4a | 801 | options->fallback_to_rsh = 0; |
5260325f | 802 | if (options->use_rsh == -1) |
803 | options->use_rsh = 0; | |
804 | if (options->batch_mode == -1) | |
805 | options->batch_mode = 0; | |
806 | if (options->check_host_ip == -1) | |
807 | options->check_host_ip = 1; | |
808 | if (options->strict_host_key_checking == -1) | |
809 | options->strict_host_key_checking = 2; /* 2 is default */ | |
810 | if (options->compression == -1) | |
811 | options->compression = 0; | |
812 | if (options->keepalives == -1) | |
813 | options->keepalives = 1; | |
814 | if (options->compression_level == -1) | |
815 | options->compression_level = 6; | |
816 | if (options->port == -1) | |
817 | options->port = 0; /* Filled in ssh_connect. */ | |
818 | if (options->connection_attempts == -1) | |
819 | options->connection_attempts = 4; | |
820 | if (options->number_of_password_prompts == -1) | |
821 | options->number_of_password_prompts = 3; | |
822 | /* Selected in ssh_login(). */ | |
823 | if (options->cipher == -1) | |
824 | options->cipher = SSH_CIPHER_NOT_SET; | |
d0c832f3 | 825 | /* options->ciphers, default set in myproposals.h */ |
b2552997 | 826 | /* options->macs, default set in myproposals.h */ |
a8be9f80 | 827 | if (options->protocol == SSH_PROTO_UNKNOWN) |
3e587cc3 | 828 | options->protocol = SSH_PROTO_1|SSH_PROTO_2; |
5260325f | 829 | if (options->num_identity_files == 0) { |
fa08c86b | 830 | if (options->protocol & SSH_PROTO_1) { |
d2c46e77 | 831 | len = 2 + strlen(_PATH_SSH_CLIENT_IDENTITY) + 1; |
fa08c86b | 832 | options->identity_files[options->num_identity_files] = |
d2c46e77 | 833 | xmalloc(len); |
834 | snprintf(options->identity_files[options->num_identity_files++], | |
835 | len, "~/%.100s", _PATH_SSH_CLIENT_IDENTITY); | |
fa08c86b | 836 | } |
837 | if (options->protocol & SSH_PROTO_2) { | |
ec63b02d | 838 | len = 2 + strlen(_PATH_SSH_CLIENT_ID_RSA) + 1; |
839 | options->identity_files[options->num_identity_files] = | |
840 | xmalloc(len); | |
841 | snprintf(options->identity_files[options->num_identity_files++], | |
842 | len, "~/%.100s", _PATH_SSH_CLIENT_ID_RSA); | |
843 | ||
d2c46e77 | 844 | len = 2 + strlen(_PATH_SSH_CLIENT_ID_DSA) + 1; |
fa08c86b | 845 | options->identity_files[options->num_identity_files] = |
d2c46e77 | 846 | xmalloc(len); |
847 | snprintf(options->identity_files[options->num_identity_files++], | |
848 | len, "~/%.100s", _PATH_SSH_CLIENT_ID_DSA); | |
fa08c86b | 849 | } |
a306f2dd | 850 | } |
5260325f | 851 | if (options->escape_char == -1) |
852 | options->escape_char = '~'; | |
853 | if (options->system_hostfile == NULL) | |
42f11eb2 | 854 | options->system_hostfile = _PATH_SSH_SYSTEM_HOSTFILE; |
5260325f | 855 | if (options->user_hostfile == NULL) |
42f11eb2 | 856 | options->user_hostfile = _PATH_SSH_USER_HOSTFILE; |
a306f2dd | 857 | if (options->system_hostfile2 == NULL) |
42f11eb2 | 858 | options->system_hostfile2 = _PATH_SSH_SYSTEM_HOSTFILE2; |
a306f2dd | 859 | if (options->user_hostfile2 == NULL) |
42f11eb2 | 860 | options->user_hostfile2 = _PATH_SSH_USER_HOSTFILE2; |
5260325f | 861 | if (options->log_level == (LogLevel) - 1) |
59c97189 | 862 | options->log_level = SYSLOG_LEVEL_INFO; |
5260325f | 863 | /* options->proxy_command should not be set by default */ |
864 | /* options->user will be set in the main program if appropriate */ | |
865 | /* options->hostname will be set in the main program if appropriate */ | |
8abcdba4 | 866 | /* options->host_key_alias should not be set by default */ |
cab80f75 | 867 | /* options->preferred_authentications will be set in ssh */ |
8efc0c15 | 868 | } |