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1 | /* | |
2 | * Author: Tatu Ylonen <ylo@cs.hut.fi> | |
3 | * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland | |
4 | * All rights reserved | |
5 | * Functions for reading the configuration files. | |
6 | * | |
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". | |
12 | */ | |
13 | ||
14 | #include "includes.h" | |
15 | RCSID("$OpenBSD: readconf.c,v 1.81 2001/06/23 02:34:30 markus Exp $"); | |
16 | ||
17 | #include "ssh.h" | |
18 | #include "xmalloc.h" | |
19 | #include "compat.h" | |
20 | #include "cipher.h" | |
21 | #include "pathnames.h" | |
22 | #include "log.h" | |
23 | #include "readconf.h" | |
24 | #include "match.h" | |
25 | #include "misc.h" | |
26 | #include "kex.h" | |
27 | #include "mac.h" | |
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 | |
77 | ForwardX11 no | |
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 | ||
94 | typedef enum { | |
95 | oBadOption, | |
96 | oForwardAgent, oForwardX11, oGatewayPorts, oRhostsAuthentication, | |
97 | oPasswordAuthentication, oRSAAuthentication, oFallBackToRsh, oUseRsh, | |
98 | oChallengeResponseAuthentication, oXAuthLocation, | |
99 | #ifdef KRB4 | |
100 | oKerberosAuthentication, | |
101 | #endif /* KRB4 */ | |
102 | #ifdef AFS | |
103 | oKerberosTgtPassing, oAFSTokenPassing, | |
104 | #endif | |
105 | oIdentityFile, oHostName, oPort, oCipher, oRemoteForward, oLocalForward, | |
106 | oUser, oHost, oEscapeChar, oRhostsRSAAuthentication, oProxyCommand, | |
107 | oGlobalKnownHostsFile, oUserKnownHostsFile, oConnectionAttempts, | |
108 | oBatchMode, oCheckHostIP, oStrictHostKeyChecking, oCompression, | |
109 | oCompressionLevel, oKeepAlives, oNumberOfPasswordPrompts, | |
110 | oUsePrivilegedPort, oLogLevel, oCiphers, oProtocol, oMacs, | |
111 | oGlobalKnownHostsFile2, oUserKnownHostsFile2, oPubkeyAuthentication, | |
112 | oKbdInteractiveAuthentication, oKbdInteractiveDevices, oHostKeyAlias, | |
113 | oDynamicForward, oPreferredAuthentications, oHostbasedAuthentication, | |
114 | oHostKeyAlgorithms, oBindAddress | |
115 | } OpCodes; | |
116 | ||
117 | /* Textual representations of the tokens. */ | |
118 | ||
119 | static struct { | |
120 | const char *name; | |
121 | OpCodes opcode; | |
122 | } keywords[] = { | |
123 | { "forwardagent", oForwardAgent }, | |
124 | { "forwardx11", oForwardX11 }, | |
125 | { "xauthlocation", oXAuthLocation }, | |
126 | { "gatewayports", oGatewayPorts }, | |
127 | { "useprivilegedport", oUsePrivilegedPort }, | |
128 | { "rhostsauthentication", oRhostsAuthentication }, | |
129 | { "passwordauthentication", oPasswordAuthentication }, | |
130 | { "kbdinteractiveauthentication", oKbdInteractiveAuthentication }, | |
131 | { "kbdinteractivedevices", oKbdInteractiveDevices }, | |
132 | { "rsaauthentication", oRSAAuthentication }, | |
133 | { "pubkeyauthentication", oPubkeyAuthentication }, | |
134 | { "dsaauthentication", oPubkeyAuthentication }, /* alias */ | |
135 | { "rhostsrsaauthentication", oRhostsRSAAuthentication }, | |
136 | { "hostbasedauthentication", oHostbasedAuthentication }, | |
137 | { "challengeresponseauthentication", oChallengeResponseAuthentication }, | |
138 | { "skeyauthentication", oChallengeResponseAuthentication }, /* alias */ | |
139 | { "tisauthentication", oChallengeResponseAuthentication }, /* alias */ | |
140 | #ifdef KRB4 | |
141 | { "kerberosauthentication", oKerberosAuthentication }, | |
142 | #endif /* KRB4 */ | |
143 | #ifdef AFS | |
144 | { "kerberostgtpassing", oKerberosTgtPassing }, | |
145 | { "afstokenpassing", oAFSTokenPassing }, | |
146 | #endif | |
147 | { "fallbacktorsh", oFallBackToRsh }, | |
148 | { "usersh", oUseRsh }, | |
149 | { "identityfile", oIdentityFile }, | |
150 | { "identityfile2", oIdentityFile }, /* alias */ | |
151 | { "hostname", oHostName }, | |
152 | { "hostkeyalias", oHostKeyAlias }, | |
153 | { "proxycommand", oProxyCommand }, | |
154 | { "port", oPort }, | |
155 | { "cipher", oCipher }, | |
156 | { "ciphers", oCiphers }, | |
157 | { "macs", oMacs }, | |
158 | { "protocol", oProtocol }, | |
159 | { "remoteforward", oRemoteForward }, | |
160 | { "localforward", oLocalForward }, | |
161 | { "user", oUser }, | |
162 | { "host", oHost }, | |
163 | { "escapechar", oEscapeChar }, | |
164 | { "globalknownhostsfile", oGlobalKnownHostsFile }, | |
165 | { "userknownhostsfile", oUserKnownHostsFile }, /* obsolete */ | |
166 | { "globalknownhostsfile2", oGlobalKnownHostsFile2 }, | |
167 | { "userknownhostsfile2", oUserKnownHostsFile2 }, /* obsolete */ | |
168 | { "connectionattempts", oConnectionAttempts }, | |
169 | { "batchmode", oBatchMode }, | |
170 | { "checkhostip", oCheckHostIP }, | |
171 | { "stricthostkeychecking", oStrictHostKeyChecking }, | |
172 | { "compression", oCompression }, | |
173 | { "compressionlevel", oCompressionLevel }, | |
174 | { "keepalive", oKeepAlives }, | |
175 | { "numberofpasswordprompts", oNumberOfPasswordPrompts }, | |
176 | { "loglevel", oLogLevel }, | |
177 | { "dynamicforward", oDynamicForward }, | |
178 | { "preferredauthentications", oPreferredAuthentications }, | |
179 | { "hostkeyalgorithms", oHostKeyAlgorithms }, | |
180 | { "bindaddress", oBindAddress }, | |
181 | { NULL, 0 } | |
182 | }; | |
183 | ||
184 | /* | |
185 | * Adds a local TCP/IP port forward to options. Never returns if there is an | |
186 | * error. | |
187 | */ | |
188 | ||
189 | void | |
190 | add_local_forward(Options *options, u_short port, const char *host, | |
191 | u_short host_port) | |
192 | { | |
193 | Forward *fwd; | |
194 | #ifndef HAVE_CYGWIN | |
195 | extern uid_t original_real_uid; | |
196 | if (port < IPPORT_RESERVED && original_real_uid != 0) | |
197 | fatal("Privileged ports can only be forwarded by root."); | |
198 | #endif | |
199 | if (options->num_local_forwards >= SSH_MAX_FORWARDS_PER_DIRECTION) | |
200 | fatal("Too many local forwards (max %d).", SSH_MAX_FORWARDS_PER_DIRECTION); | |
201 | fwd = &options->local_forwards[options->num_local_forwards++]; | |
202 | fwd->port = port; | |
203 | fwd->host = xstrdup(host); | |
204 | fwd->host_port = host_port; | |
205 | } | |
206 | ||
207 | /* | |
208 | * Adds a remote TCP/IP port forward to options. Never returns if there is | |
209 | * an error. | |
210 | */ | |
211 | ||
212 | void | |
213 | add_remote_forward(Options *options, u_short port, const char *host, | |
214 | u_short host_port) | |
215 | { | |
216 | Forward *fwd; | |
217 | if (options->num_remote_forwards >= SSH_MAX_FORWARDS_PER_DIRECTION) | |
218 | fatal("Too many remote forwards (max %d).", | |
219 | SSH_MAX_FORWARDS_PER_DIRECTION); | |
220 | fwd = &options->remote_forwards[options->num_remote_forwards++]; | |
221 | fwd->port = port; | |
222 | fwd->host = xstrdup(host); | |
223 | fwd->host_port = host_port; | |
224 | } | |
225 | ||
226 | /* | |
227 | * Returns the number of the token pointed to by cp or oBadOption. | |
228 | */ | |
229 | ||
230 | static OpCodes | |
231 | parse_token(const char *cp, const char *filename, int linenum) | |
232 | { | |
233 | u_int i; | |
234 | ||
235 | for (i = 0; keywords[i].name; i++) | |
236 | if (strcasecmp(cp, keywords[i].name) == 0) | |
237 | return keywords[i].opcode; | |
238 | ||
239 | error("%s: line %d: Bad configuration option: %s", | |
240 | filename, linenum, cp); | |
241 | return oBadOption; | |
242 | } | |
243 | ||
244 | /* | |
245 | * Processes a single option line as used in the configuration files. This | |
246 | * only sets those values that have not already been set. | |
247 | */ | |
248 | ||
249 | int | |
250 | process_config_line(Options *options, const char *host, | |
251 | char *line, const char *filename, int linenum, | |
252 | int *activep) | |
253 | { | |
254 | char buf[256], *s, *string, **charptr, *endofnumber, *keyword, *arg; | |
255 | int opcode, *intptr, value; | |
256 | u_short fwd_port, fwd_host_port; | |
257 | ||
258 | s = line; | |
259 | /* Get the keyword. (Each line is supposed to begin with a keyword). */ | |
260 | keyword = strdelim(&s); | |
261 | /* Ignore leading whitespace. */ | |
262 | if (*keyword == '\0') | |
263 | keyword = strdelim(&s); | |
264 | if (keyword == NULL || !*keyword || *keyword == '\n' || *keyword == '#') | |
265 | return 0; | |
266 | ||
267 | opcode = parse_token(keyword, filename, linenum); | |
268 | ||
269 | switch (opcode) { | |
270 | case oBadOption: | |
271 | /* don't panic, but count bad options */ | |
272 | return -1; | |
273 | /* NOTREACHED */ | |
274 | case oForwardAgent: | |
275 | intptr = &options->forward_agent; | |
276 | parse_flag: | |
277 | arg = strdelim(&s); | |
278 | if (!arg || *arg == '\0') | |
279 | fatal("%.200s line %d: Missing yes/no argument.", filename, linenum); | |
280 | value = 0; /* To avoid compiler warning... */ | |
281 | if (strcmp(arg, "yes") == 0 || strcmp(arg, "true") == 0) | |
282 | value = 1; | |
283 | else if (strcmp(arg, "no") == 0 || strcmp(arg, "false") == 0) | |
284 | value = 0; | |
285 | else | |
286 | fatal("%.200s line %d: Bad yes/no argument.", filename, linenum); | |
287 | if (*activep && *intptr == -1) | |
288 | *intptr = value; | |
289 | break; | |
290 | ||
291 | case oForwardX11: | |
292 | intptr = &options->forward_x11; | |
293 | goto parse_flag; | |
294 | ||
295 | case oGatewayPorts: | |
296 | intptr = &options->gateway_ports; | |
297 | goto parse_flag; | |
298 | ||
299 | case oUsePrivilegedPort: | |
300 | intptr = &options->use_privileged_port; | |
301 | goto parse_flag; | |
302 | ||
303 | case oRhostsAuthentication: | |
304 | intptr = &options->rhosts_authentication; | |
305 | goto parse_flag; | |
306 | ||
307 | case oPasswordAuthentication: | |
308 | intptr = &options->password_authentication; | |
309 | goto parse_flag; | |
310 | ||
311 | case oKbdInteractiveAuthentication: | |
312 | intptr = &options->kbd_interactive_authentication; | |
313 | goto parse_flag; | |
314 | ||
315 | case oKbdInteractiveDevices: | |
316 | charptr = &options->kbd_interactive_devices; | |
317 | goto parse_string; | |
318 | ||
319 | case oPubkeyAuthentication: | |
320 | intptr = &options->pubkey_authentication; | |
321 | goto parse_flag; | |
322 | ||
323 | case oRSAAuthentication: | |
324 | intptr = &options->rsa_authentication; | |
325 | goto parse_flag; | |
326 | ||
327 | case oRhostsRSAAuthentication: | |
328 | intptr = &options->rhosts_rsa_authentication; | |
329 | goto parse_flag; | |
330 | ||
331 | case oHostbasedAuthentication: | |
332 | intptr = &options->hostbased_authentication; | |
333 | goto parse_flag; | |
334 | ||
335 | case oChallengeResponseAuthentication: | |
336 | intptr = &options->challenge_response_authentication; | |
337 | goto parse_flag; | |
338 | ||
339 | #ifdef KRB4 | |
340 | case oKerberosAuthentication: | |
341 | intptr = &options->kerberos_authentication; | |
342 | goto parse_flag; | |
343 | #endif /* KRB4 */ | |
344 | ||
345 | #ifdef AFS | |
346 | case oKerberosTgtPassing: | |
347 | intptr = &options->kerberos_tgt_passing; | |
348 | goto parse_flag; | |
349 | ||
350 | case oAFSTokenPassing: | |
351 | intptr = &options->afs_token_passing; | |
352 | goto parse_flag; | |
353 | #endif | |
354 | ||
355 | case oFallBackToRsh: | |
356 | intptr = &options->fallback_to_rsh; | |
357 | goto parse_flag; | |
358 | ||
359 | case oUseRsh: | |
360 | intptr = &options->use_rsh; | |
361 | goto parse_flag; | |
362 | ||
363 | case oBatchMode: | |
364 | intptr = &options->batch_mode; | |
365 | goto parse_flag; | |
366 | ||
367 | case oCheckHostIP: | |
368 | intptr = &options->check_host_ip; | |
369 | goto parse_flag; | |
370 | ||
371 | case oStrictHostKeyChecking: | |
372 | intptr = &options->strict_host_key_checking; | |
373 | arg = strdelim(&s); | |
374 | if (!arg || *arg == '\0') | |
375 | fatal("%.200s line %d: Missing yes/no/ask argument.", | |
376 | filename, linenum); | |
377 | value = 0; /* To avoid compiler warning... */ | |
378 | if (strcmp(arg, "yes") == 0 || strcmp(arg, "true") == 0) | |
379 | value = 1; | |
380 | else if (strcmp(arg, "no") == 0 || strcmp(arg, "false") == 0) | |
381 | value = 0; | |
382 | else if (strcmp(arg, "ask") == 0) | |
383 | value = 2; | |
384 | else | |
385 | fatal("%.200s line %d: Bad yes/no/ask argument.", filename, linenum); | |
386 | if (*activep && *intptr == -1) | |
387 | *intptr = value; | |
388 | break; | |
389 | ||
390 | case oCompression: | |
391 | intptr = &options->compression; | |
392 | goto parse_flag; | |
393 | ||
394 | case oKeepAlives: | |
395 | intptr = &options->keepalives; | |
396 | goto parse_flag; | |
397 | ||
398 | case oNumberOfPasswordPrompts: | |
399 | intptr = &options->number_of_password_prompts; | |
400 | goto parse_int; | |
401 | ||
402 | case oCompressionLevel: | |
403 | intptr = &options->compression_level; | |
404 | goto parse_int; | |
405 | ||
406 | case oIdentityFile: | |
407 | arg = strdelim(&s); | |
408 | if (!arg || *arg == '\0') | |
409 | fatal("%.200s line %d: Missing argument.", filename, linenum); | |
410 | if (*activep) { | |
411 | intptr = &options->num_identity_files; | |
412 | if (*intptr >= SSH_MAX_IDENTITY_FILES) | |
413 | fatal("%.200s line %d: Too many identity files specified (max %d).", | |
414 | filename, linenum, SSH_MAX_IDENTITY_FILES); | |
415 | charptr = &options->identity_files[*intptr]; | |
416 | *charptr = xstrdup(arg); | |
417 | *intptr = *intptr + 1; | |
418 | } | |
419 | break; | |
420 | ||
421 | case oXAuthLocation: | |
422 | charptr=&options->xauth_location; | |
423 | goto parse_string; | |
424 | ||
425 | case oUser: | |
426 | charptr = &options->user; | |
427 | parse_string: | |
428 | arg = strdelim(&s); | |
429 | if (!arg || *arg == '\0') | |
430 | fatal("%.200s line %d: Missing argument.", filename, linenum); | |
431 | if (*activep && *charptr == NULL) | |
432 | *charptr = xstrdup(arg); | |
433 | break; | |
434 | ||
435 | case oGlobalKnownHostsFile: | |
436 | charptr = &options->system_hostfile; | |
437 | goto parse_string; | |
438 | ||
439 | case oUserKnownHostsFile: | |
440 | charptr = &options->user_hostfile; | |
441 | goto parse_string; | |
442 | ||
443 | case oGlobalKnownHostsFile2: | |
444 | charptr = &options->system_hostfile2; | |
445 | goto parse_string; | |
446 | ||
447 | case oUserKnownHostsFile2: | |
448 | charptr = &options->user_hostfile2; | |
449 | goto parse_string; | |
450 | ||
451 | case oHostName: | |
452 | charptr = &options->hostname; | |
453 | goto parse_string; | |
454 | ||
455 | case oHostKeyAlias: | |
456 | charptr = &options->host_key_alias; | |
457 | goto parse_string; | |
458 | ||
459 | case oPreferredAuthentications: | |
460 | charptr = &options->preferred_authentications; | |
461 | goto parse_string; | |
462 | ||
463 | case oBindAddress: | |
464 | charptr = &options->bind_address; | |
465 | goto parse_string; | |
466 | ||
467 | case oProxyCommand: | |
468 | charptr = &options->proxy_command; | |
469 | string = xstrdup(""); | |
470 | while ((arg = strdelim(&s)) != NULL && *arg != '\0') { | |
471 | string = xrealloc(string, strlen(string) + strlen(arg) + 2); | |
472 | strcat(string, " "); | |
473 | strcat(string, arg); | |
474 | } | |
475 | if (*activep && *charptr == NULL) | |
476 | *charptr = string; | |
477 | else | |
478 | xfree(string); | |
479 | return 0; | |
480 | ||
481 | case oPort: | |
482 | intptr = &options->port; | |
483 | parse_int: | |
484 | arg = strdelim(&s); | |
485 | if (!arg || *arg == '\0') | |
486 | fatal("%.200s line %d: Missing argument.", filename, linenum); | |
487 | if (arg[0] < '0' || arg[0] > '9') | |
488 | fatal("%.200s line %d: Bad number.", filename, linenum); | |
489 | ||
490 | /* Octal, decimal, or hex format? */ | |
491 | value = strtol(arg, &endofnumber, 0); | |
492 | if (arg == endofnumber) | |
493 | fatal("%.200s line %d: Bad number.", filename, linenum); | |
494 | if (*activep && *intptr == -1) | |
495 | *intptr = value; | |
496 | break; | |
497 | ||
498 | case oConnectionAttempts: | |
499 | intptr = &options->connection_attempts; | |
500 | goto parse_int; | |
501 | ||
502 | case oCipher: | |
503 | intptr = &options->cipher; | |
504 | arg = strdelim(&s); | |
505 | if (!arg || *arg == '\0') | |
506 | fatal("%.200s line %d: Missing argument.", filename, linenum); | |
507 | value = cipher_number(arg); | |
508 | if (value == -1) | |
509 | fatal("%.200s line %d: Bad cipher '%s'.", | |
510 | filename, linenum, arg ? arg : "<NONE>"); | |
511 | if (*activep && *intptr == -1) | |
512 | *intptr = value; | |
513 | break; | |
514 | ||
515 | case oCiphers: | |
516 | arg = strdelim(&s); | |
517 | if (!arg || *arg == '\0') | |
518 | fatal("%.200s line %d: Missing argument.", filename, linenum); | |
519 | if (!ciphers_valid(arg)) | |
520 | fatal("%.200s line %d: Bad SSH2 cipher spec '%s'.", | |
521 | filename, linenum, arg ? arg : "<NONE>"); | |
522 | if (*activep && options->ciphers == NULL) | |
523 | options->ciphers = xstrdup(arg); | |
524 | break; | |
525 | ||
526 | case oMacs: | |
527 | arg = strdelim(&s); | |
528 | if (!arg || *arg == '\0') | |
529 | fatal("%.200s line %d: Missing argument.", filename, linenum); | |
530 | if (!mac_valid(arg)) | |
531 | fatal("%.200s line %d: Bad SSH2 Mac spec '%s'.", | |
532 | filename, linenum, arg ? arg : "<NONE>"); | |
533 | if (*activep && options->macs == NULL) | |
534 | options->macs = xstrdup(arg); | |
535 | break; | |
536 | ||
537 | case oHostKeyAlgorithms: | |
538 | arg = strdelim(&s); | |
539 | if (!arg || *arg == '\0') | |
540 | fatal("%.200s line %d: Missing argument.", filename, linenum); | |
541 | if (!key_names_valid2(arg)) | |
542 | fatal("%.200s line %d: Bad protocol 2 host key algorithms '%s'.", | |
543 | filename, linenum, arg ? arg : "<NONE>"); | |
544 | if (*activep && options->hostkeyalgorithms == NULL) | |
545 | options->hostkeyalgorithms = xstrdup(arg); | |
546 | break; | |
547 | ||
548 | case oProtocol: | |
549 | intptr = &options->protocol; | |
550 | arg = strdelim(&s); | |
551 | if (!arg || *arg == '\0') | |
552 | fatal("%.200s line %d: Missing argument.", filename, linenum); | |
553 | value = proto_spec(arg); | |
554 | if (value == SSH_PROTO_UNKNOWN) | |
555 | fatal("%.200s line %d: Bad protocol spec '%s'.", | |
556 | filename, linenum, arg ? arg : "<NONE>"); | |
557 | if (*activep && *intptr == SSH_PROTO_UNKNOWN) | |
558 | *intptr = value; | |
559 | break; | |
560 | ||
561 | case oLogLevel: | |
562 | intptr = (int *) &options->log_level; | |
563 | arg = strdelim(&s); | |
564 | value = log_level_number(arg); | |
565 | if (value == (LogLevel) - 1) | |
566 | fatal("%.200s line %d: unsupported log level '%s'", | |
567 | filename, linenum, arg ? arg : "<NONE>"); | |
568 | if (*activep && (LogLevel) * intptr == -1) | |
569 | *intptr = (LogLevel) value; | |
570 | break; | |
571 | ||
572 | case oRemoteForward: | |
573 | arg = strdelim(&s); | |
574 | if (!arg || *arg == '\0') | |
575 | fatal("%.200s line %d: Missing argument.", filename, linenum); | |
576 | fwd_port = a2port(arg); | |
577 | if (fwd_port == 0) | |
578 | fatal("%.200s line %d: Badly formatted port number.", | |
579 | filename, linenum); | |
580 | arg = strdelim(&s); | |
581 | if (!arg || *arg == '\0') | |
582 | fatal("%.200s line %d: Missing second argument.", | |
583 | filename, linenum); | |
584 | if (sscanf(arg, "%255[^:]:%hu", buf, &fwd_host_port) != 2) | |
585 | fatal("%.200s line %d: Badly formatted host:port.", | |
586 | filename, linenum); | |
587 | if (*activep) | |
588 | add_remote_forward(options, fwd_port, buf, fwd_host_port); | |
589 | break; | |
590 | ||
591 | case oLocalForward: | |
592 | arg = strdelim(&s); | |
593 | if (!arg || *arg == '\0') | |
594 | fatal("%.200s line %d: Missing argument.", filename, linenum); | |
595 | fwd_port = a2port(arg); | |
596 | if (fwd_port == 0) | |
597 | fatal("%.200s line %d: Badly formatted port number.", | |
598 | filename, linenum); | |
599 | arg = strdelim(&s); | |
600 | if (!arg || *arg == '\0') | |
601 | fatal("%.200s line %d: Missing second argument.", | |
602 | filename, linenum); | |
603 | if (sscanf(arg, "%255[^:]:%hu", buf, &fwd_host_port) != 2) | |
604 | fatal("%.200s line %d: Badly formatted host:port.", | |
605 | filename, linenum); | |
606 | if (*activep) | |
607 | add_local_forward(options, fwd_port, buf, fwd_host_port); | |
608 | break; | |
609 | ||
610 | case oDynamicForward: | |
611 | arg = strdelim(&s); | |
612 | if (!arg || *arg == '\0') | |
613 | fatal("%.200s line %d: Missing port argument.", | |
614 | filename, linenum); | |
615 | fwd_port = a2port(arg); | |
616 | if (fwd_port == 0) | |
617 | fatal("%.200s line %d: Badly formatted port number.", | |
618 | filename, linenum); | |
619 | add_local_forward(options, fwd_port, "socks4", 0); | |
620 | break; | |
621 | ||
622 | case oHost: | |
623 | *activep = 0; | |
624 | while ((arg = strdelim(&s)) != NULL && *arg != '\0') | |
625 | if (match_pattern(host, arg)) { | |
626 | debug("Applying options for %.100s", arg); | |
627 | *activep = 1; | |
628 | break; | |
629 | } | |
630 | /* Avoid garbage check below, as strdelim is done. */ | |
631 | return 0; | |
632 | ||
633 | case oEscapeChar: | |
634 | intptr = &options->escape_char; | |
635 | arg = strdelim(&s); | |
636 | if (!arg || *arg == '\0') | |
637 | fatal("%.200s line %d: Missing argument.", filename, linenum); | |
638 | if (arg[0] == '^' && arg[2] == 0 && | |
639 | (u_char) arg[1] >= 64 && (u_char) arg[1] < 128) | |
640 | value = (u_char) arg[1] & 31; | |
641 | else if (strlen(arg) == 1) | |
642 | value = (u_char) arg[0]; | |
643 | else if (strcmp(arg, "none") == 0) | |
644 | value = SSH_ESCAPECHAR_NONE; | |
645 | else { | |
646 | fatal("%.200s line %d: Bad escape character.", | |
647 | filename, linenum); | |
648 | /* NOTREACHED */ | |
649 | value = 0; /* Avoid compiler warning. */ | |
650 | } | |
651 | if (*activep && *intptr == -1) | |
652 | *intptr = value; | |
653 | break; | |
654 | ||
655 | default: | |
656 | fatal("process_config_line: Unimplemented opcode %d", opcode); | |
657 | } | |
658 | ||
659 | /* Check that there is no garbage at end of line. */ | |
660 | if ((arg = strdelim(&s)) != NULL && *arg != '\0') { | |
661 | fatal("%.200s line %d: garbage at end of line; \"%.200s\".", | |
662 | filename, linenum, arg); | |
663 | } | |
664 | return 0; | |
665 | } | |
666 | ||
667 | ||
668 | /* | |
669 | * Reads the config file and modifies the options accordingly. Options | |
670 | * should already be initialized before this call. This never returns if | |
671 | * there is an error. If the file does not exist, this returns immediately. | |
672 | */ | |
673 | ||
674 | void | |
675 | read_config_file(const char *filename, const char *host, Options *options) | |
676 | { | |
677 | FILE *f; | |
678 | char line[1024]; | |
679 | int active, linenum; | |
680 | int bad_options = 0; | |
681 | ||
682 | /* Open the file. */ | |
683 | f = fopen(filename, "r"); | |
684 | if (!f) | |
685 | return; | |
686 | ||
687 | debug("Reading configuration data %.200s", filename); | |
688 | ||
689 | /* | |
690 | * Mark that we are now processing the options. This flag is turned | |
691 | * on/off by Host specifications. | |
692 | */ | |
693 | active = 1; | |
694 | linenum = 0; | |
695 | while (fgets(line, sizeof(line), f)) { | |
696 | /* Update line number counter. */ | |
697 | linenum++; | |
698 | if (process_config_line(options, host, line, filename, linenum, &active) != 0) | |
699 | bad_options++; | |
700 | } | |
701 | fclose(f); | |
702 | if (bad_options > 0) | |
703 | fatal("%s: terminating, %d bad configuration options", | |
704 | filename, bad_options); | |
705 | } | |
706 | ||
707 | /* | |
708 | * Initializes options to special values that indicate that they have not yet | |
709 | * been set. Read_config_file will only set options with this value. Options | |
710 | * are processed in the following order: command line, user config file, | |
711 | * system config file. Last, fill_default_options is called. | |
712 | */ | |
713 | ||
714 | void | |
715 | initialize_options(Options * options) | |
716 | { | |
717 | memset(options, 'X', sizeof(*options)); | |
718 | options->forward_agent = -1; | |
719 | options->forward_x11 = -1; | |
720 | options->xauth_location = NULL; | |
721 | options->gateway_ports = -1; | |
722 | options->use_privileged_port = -1; | |
723 | options->rhosts_authentication = -1; | |
724 | options->rsa_authentication = -1; | |
725 | options->pubkey_authentication = -1; | |
726 | options->challenge_response_authentication = -1; | |
727 | #ifdef KRB4 | |
728 | options->kerberos_authentication = -1; | |
729 | #endif | |
730 | #ifdef AFS | |
731 | options->kerberos_tgt_passing = -1; | |
732 | options->afs_token_passing = -1; | |
733 | #endif | |
734 | options->password_authentication = -1; | |
735 | options->kbd_interactive_authentication = -1; | |
736 | options->kbd_interactive_devices = NULL; | |
737 | options->rhosts_rsa_authentication = -1; | |
738 | options->hostbased_authentication = -1; | |
739 | options->fallback_to_rsh = -1; | |
740 | options->use_rsh = -1; | |
741 | options->batch_mode = -1; | |
742 | options->check_host_ip = -1; | |
743 | options->strict_host_key_checking = -1; | |
744 | options->compression = -1; | |
745 | options->keepalives = -1; | |
746 | options->compression_level = -1; | |
747 | options->port = -1; | |
748 | options->connection_attempts = -1; | |
749 | options->number_of_password_prompts = -1; | |
750 | options->cipher = -1; | |
751 | options->ciphers = NULL; | |
752 | options->macs = NULL; | |
753 | options->hostkeyalgorithms = NULL; | |
754 | options->protocol = SSH_PROTO_UNKNOWN; | |
755 | options->num_identity_files = 0; | |
756 | options->hostname = NULL; | |
757 | options->host_key_alias = NULL; | |
758 | options->proxy_command = NULL; | |
759 | options->user = NULL; | |
760 | options->escape_char = -1; | |
761 | options->system_hostfile = NULL; | |
762 | options->user_hostfile = NULL; | |
763 | options->system_hostfile2 = NULL; | |
764 | options->user_hostfile2 = NULL; | |
765 | options->num_local_forwards = 0; | |
766 | options->num_remote_forwards = 0; | |
767 | options->log_level = (LogLevel) - 1; | |
768 | options->preferred_authentications = NULL; | |
769 | options->bind_address = NULL; | |
770 | } | |
771 | ||
772 | /* | |
773 | * Called after processing other sources of option data, this fills those | |
774 | * options for which no value has been specified with their default values. | |
775 | */ | |
776 | ||
777 | void | |
778 | fill_default_options(Options * options) | |
779 | { | |
780 | int len; | |
781 | ||
782 | if (options->forward_agent == -1) | |
783 | options->forward_agent = 0; | |
784 | if (options->forward_x11 == -1) | |
785 | options->forward_x11 = 0; | |
786 | #ifdef _PATH_XAUTH | |
787 | if (options->xauth_location == NULL) | |
788 | options->xauth_location = _PATH_XAUTH; | |
789 | #endif | |
790 | if (options->gateway_ports == -1) | |
791 | options->gateway_ports = 0; | |
792 | if (options->use_privileged_port == -1) | |
793 | options->use_privileged_port = 0; | |
794 | if (options->rhosts_authentication == -1) | |
795 | options->rhosts_authentication = 1; | |
796 | if (options->rsa_authentication == -1) | |
797 | options->rsa_authentication = 1; | |
798 | if (options->pubkey_authentication == -1) | |
799 | options->pubkey_authentication = 1; | |
800 | if (options->challenge_response_authentication == -1) | |
801 | options->challenge_response_authentication = 0; | |
802 | #ifdef KRB4 | |
803 | if (options->kerberos_authentication == -1) | |
804 | options->kerberos_authentication = 1; | |
805 | #endif /* KRB4 */ | |
806 | #ifdef AFS | |
807 | if (options->kerberos_tgt_passing == -1) | |
808 | options->kerberos_tgt_passing = 1; | |
809 | if (options->afs_token_passing == -1) | |
810 | options->afs_token_passing = 1; | |
811 | #endif /* AFS */ | |
812 | if (options->password_authentication == -1) | |
813 | options->password_authentication = 1; | |
814 | if (options->kbd_interactive_authentication == -1) | |
815 | options->kbd_interactive_authentication = 1; | |
816 | if (options->rhosts_rsa_authentication == -1) | |
817 | options->rhosts_rsa_authentication = 1; | |
818 | if (options->hostbased_authentication == -1) | |
819 | options->hostbased_authentication = 0; | |
820 | if (options->fallback_to_rsh == -1) | |
821 | options->fallback_to_rsh = 0; | |
822 | if (options->use_rsh == -1) | |
823 | options->use_rsh = 0; | |
824 | if (options->batch_mode == -1) | |
825 | options->batch_mode = 0; | |
826 | if (options->check_host_ip == -1) | |
827 | options->check_host_ip = 1; | |
828 | if (options->strict_host_key_checking == -1) | |
829 | options->strict_host_key_checking = 2; /* 2 is default */ | |
830 | if (options->compression == -1) | |
831 | options->compression = 0; | |
832 | if (options->keepalives == -1) | |
833 | options->keepalives = 1; | |
834 | if (options->compression_level == -1) | |
835 | options->compression_level = 6; | |
836 | if (options->port == -1) | |
837 | options->port = 0; /* Filled in ssh_connect. */ | |
838 | if (options->connection_attempts == -1) | |
839 | options->connection_attempts = 4; | |
840 | if (options->number_of_password_prompts == -1) | |
841 | options->number_of_password_prompts = 3; | |
842 | /* Selected in ssh_login(). */ | |
843 | if (options->cipher == -1) | |
844 | options->cipher = SSH_CIPHER_NOT_SET; | |
845 | /* options->ciphers, default set in myproposals.h */ | |
846 | /* options->macs, default set in myproposals.h */ | |
847 | /* options->hostkeyalgorithms, default set in myproposals.h */ | |
848 | if (options->protocol == SSH_PROTO_UNKNOWN) | |
849 | options->protocol = SSH_PROTO_1|SSH_PROTO_2; | |
850 | if (options->num_identity_files == 0) { | |
851 | if (options->protocol & SSH_PROTO_1) { | |
852 | len = 2 + strlen(_PATH_SSH_CLIENT_IDENTITY) + 1; | |
853 | options->identity_files[options->num_identity_files] = | |
854 | xmalloc(len); | |
855 | snprintf(options->identity_files[options->num_identity_files++], | |
856 | len, "~/%.100s", _PATH_SSH_CLIENT_IDENTITY); | |
857 | } | |
858 | if (options->protocol & SSH_PROTO_2) { | |
859 | len = 2 + strlen(_PATH_SSH_CLIENT_ID_RSA) + 1; | |
860 | options->identity_files[options->num_identity_files] = | |
861 | xmalloc(len); | |
862 | snprintf(options->identity_files[options->num_identity_files++], | |
863 | len, "~/%.100s", _PATH_SSH_CLIENT_ID_RSA); | |
864 | ||
865 | len = 2 + strlen(_PATH_SSH_CLIENT_ID_DSA) + 1; | |
866 | options->identity_files[options->num_identity_files] = | |
867 | xmalloc(len); | |
868 | snprintf(options->identity_files[options->num_identity_files++], | |
869 | len, "~/%.100s", _PATH_SSH_CLIENT_ID_DSA); | |
870 | } | |
871 | } | |
872 | if (options->escape_char == -1) | |
873 | options->escape_char = '~'; | |
874 | if (options->system_hostfile == NULL) | |
875 | options->system_hostfile = _PATH_SSH_SYSTEM_HOSTFILE; | |
876 | if (options->user_hostfile == NULL) | |
877 | options->user_hostfile = _PATH_SSH_USER_HOSTFILE; | |
878 | if (options->system_hostfile2 == NULL) | |
879 | options->system_hostfile2 = _PATH_SSH_SYSTEM_HOSTFILE2; | |
880 | if (options->user_hostfile2 == NULL) | |
881 | options->user_hostfile2 = _PATH_SSH_USER_HOSTFILE2; | |
882 | if (options->log_level == (LogLevel) - 1) | |
883 | options->log_level = SYSLOG_LEVEL_INFO; | |
884 | /* options->proxy_command should not be set by default */ | |
885 | /* options->user will be set in the main program if appropriate */ | |
886 | /* options->hostname will be set in the main program if appropriate */ | |
887 | /* options->host_key_alias should not be set by default */ | |
888 | /* options->preferred_authentications will be set in ssh */ | |
889 | } |