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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 1.107 2003/05/14 18:16:20 jakob 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 | User foo | |
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 | PublicKeyAuthentication no | |
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 | StrictHostKeyChecking yes | |
83 | KeepAlives no | |
84 | IdentityFile ~/.ssh/identity | |
85 | Port 22 | |
86 | EscapeChar ~ | |
87 | ||
88 | */ | |
89 | ||
90 | /* Keyword tokens. */ | |
91 | ||
92 | typedef enum { | |
93 | oBadOption, | |
94 | oForwardAgent, oForwardX11, oGatewayPorts, oRhostsAuthentication, | |
95 | oPasswordAuthentication, oRSAAuthentication, | |
96 | oChallengeResponseAuthentication, oXAuthLocation, | |
97 | #if defined(KRB4) || defined(KRB5) | |
98 | oKerberosAuthentication, | |
99 | #endif | |
100 | #if defined(AFS) || defined(KRB5) | |
101 | oKerberosTgtPassing, | |
102 | #endif | |
103 | #ifdef AFS | |
104 | oAFSTokenPassing, | |
105 | #endif | |
106 | oIdentityFile, oHostName, oPort, oCipher, oRemoteForward, oLocalForward, | |
107 | oUser, oHost, oEscapeChar, oRhostsRSAAuthentication, oProxyCommand, | |
108 | oGlobalKnownHostsFile, oUserKnownHostsFile, oConnectionAttempts, | |
109 | oBatchMode, oCheckHostIP, oStrictHostKeyChecking, oCompression, | |
110 | oCompressionLevel, oKeepAlives, oNumberOfPasswordPrompts, | |
111 | oUsePrivilegedPort, oLogLevel, oCiphers, oProtocol, oMacs, | |
112 | oGlobalKnownHostsFile2, oUserKnownHostsFile2, oPubkeyAuthentication, | |
113 | oKbdInteractiveAuthentication, oKbdInteractiveDevices, oHostKeyAlias, | |
114 | oDynamicForward, oPreferredAuthentications, oHostbasedAuthentication, | |
115 | oHostKeyAlgorithms, oBindAddress, oSmartcardDevice, | |
116 | oClearAllForwardings, oNoHostAuthenticationForLocalhost, | |
117 | oEnableSSHKeysign, oRekeyLimit, oVerifyHostKeyDNS, | |
118 | oDeprecated | |
119 | } OpCodes; | |
120 | ||
121 | /* Textual representations of the tokens. */ | |
122 | ||
123 | static struct { | |
124 | const char *name; | |
125 | OpCodes opcode; | |
126 | } keywords[] = { | |
127 | { "forwardagent", oForwardAgent }, | |
128 | { "forwardx11", oForwardX11 }, | |
129 | { "xauthlocation", oXAuthLocation }, | |
130 | { "gatewayports", oGatewayPorts }, | |
131 | { "useprivilegedport", oUsePrivilegedPort }, | |
132 | { "rhostsauthentication", oRhostsAuthentication }, | |
133 | { "passwordauthentication", oPasswordAuthentication }, | |
134 | { "kbdinteractiveauthentication", oKbdInteractiveAuthentication }, | |
135 | { "kbdinteractivedevices", oKbdInteractiveDevices }, | |
136 | { "rsaauthentication", oRSAAuthentication }, | |
137 | { "pubkeyauthentication", oPubkeyAuthentication }, | |
138 | { "dsaauthentication", oPubkeyAuthentication }, /* alias */ | |
139 | { "rhostsrsaauthentication", oRhostsRSAAuthentication }, | |
140 | { "hostbasedauthentication", oHostbasedAuthentication }, | |
141 | { "challengeresponseauthentication", oChallengeResponseAuthentication }, | |
142 | { "skeyauthentication", oChallengeResponseAuthentication }, /* alias */ | |
143 | { "tisauthentication", oChallengeResponseAuthentication }, /* alias */ | |
144 | #if defined(KRB4) || defined(KRB5) | |
145 | { "kerberosauthentication", oKerberosAuthentication }, | |
146 | #endif | |
147 | #if defined(AFS) || defined(KRB5) | |
148 | { "kerberostgtpassing", oKerberosTgtPassing }, | |
149 | #endif | |
150 | #ifdef AFS | |
151 | { "afstokenpassing", oAFSTokenPassing }, | |
152 | #endif | |
153 | { "fallbacktorsh", oDeprecated }, | |
154 | { "usersh", oDeprecated }, | |
155 | { "identityfile", oIdentityFile }, | |
156 | { "identityfile2", oIdentityFile }, /* alias */ | |
157 | { "hostname", oHostName }, | |
158 | { "hostkeyalias", oHostKeyAlias }, | |
159 | { "proxycommand", oProxyCommand }, | |
160 | { "port", oPort }, | |
161 | { "cipher", oCipher }, | |
162 | { "ciphers", oCiphers }, | |
163 | { "macs", oMacs }, | |
164 | { "protocol", oProtocol }, | |
165 | { "remoteforward", oRemoteForward }, | |
166 | { "localforward", oLocalForward }, | |
167 | { "user", oUser }, | |
168 | { "host", oHost }, | |
169 | { "escapechar", oEscapeChar }, | |
170 | { "globalknownhostsfile", oGlobalKnownHostsFile }, | |
171 | { "userknownhostsfile", oUserKnownHostsFile }, /* obsolete */ | |
172 | { "globalknownhostsfile2", oGlobalKnownHostsFile2 }, | |
173 | { "userknownhostsfile2", oUserKnownHostsFile2 }, /* obsolete */ | |
174 | { "connectionattempts", oConnectionAttempts }, | |
175 | { "batchmode", oBatchMode }, | |
176 | { "checkhostip", oCheckHostIP }, | |
177 | { "stricthostkeychecking", oStrictHostKeyChecking }, | |
178 | { "compression", oCompression }, | |
179 | { "compressionlevel", oCompressionLevel }, | |
180 | { "keepalive", oKeepAlives }, | |
181 | { "numberofpasswordprompts", oNumberOfPasswordPrompts }, | |
182 | { "loglevel", oLogLevel }, | |
183 | { "dynamicforward", oDynamicForward }, | |
184 | { "preferredauthentications", oPreferredAuthentications }, | |
185 | { "hostkeyalgorithms", oHostKeyAlgorithms }, | |
186 | { "bindaddress", oBindAddress }, | |
187 | { "smartcarddevice", oSmartcardDevice }, | |
188 | { "clearallforwardings", oClearAllForwardings }, | |
189 | { "enablesshkeysign", oEnableSSHKeysign }, | |
190 | { "verifyhostkeydns", oVerifyHostKeyDNS }, | |
191 | { "nohostauthenticationforlocalhost", oNoHostAuthenticationForLocalhost }, | |
192 | { "rekeylimit", oRekeyLimit }, | |
193 | { NULL, oBadOption } | |
194 | }; | |
195 | ||
196 | /* | |
197 | * Adds a local TCP/IP port forward to options. Never returns if there is an | |
198 | * error. | |
199 | */ | |
200 | ||
201 | void | |
202 | add_local_forward(Options *options, u_short port, const char *host, | |
203 | u_short host_port) | |
204 | { | |
205 | Forward *fwd; | |
206 | #ifndef NO_IPPORT_RESERVED_CONCEPT | |
207 | extern uid_t original_real_uid; | |
208 | if (port < IPPORT_RESERVED && original_real_uid != 0) | |
209 | fatal("Privileged ports can only be forwarded by root."); | |
210 | #endif | |
211 | if (options->num_local_forwards >= SSH_MAX_FORWARDS_PER_DIRECTION) | |
212 | fatal("Too many local forwards (max %d).", SSH_MAX_FORWARDS_PER_DIRECTION); | |
213 | fwd = &options->local_forwards[options->num_local_forwards++]; | |
214 | fwd->port = port; | |
215 | fwd->host = xstrdup(host); | |
216 | fwd->host_port = host_port; | |
217 | } | |
218 | ||
219 | /* | |
220 | * Adds a remote TCP/IP port forward to options. Never returns if there is | |
221 | * an error. | |
222 | */ | |
223 | ||
224 | void | |
225 | add_remote_forward(Options *options, u_short port, const char *host, | |
226 | u_short host_port) | |
227 | { | |
228 | Forward *fwd; | |
229 | if (options->num_remote_forwards >= SSH_MAX_FORWARDS_PER_DIRECTION) | |
230 | fatal("Too many remote forwards (max %d).", | |
231 | SSH_MAX_FORWARDS_PER_DIRECTION); | |
232 | fwd = &options->remote_forwards[options->num_remote_forwards++]; | |
233 | fwd->port = port; | |
234 | fwd->host = xstrdup(host); | |
235 | fwd->host_port = host_port; | |
236 | } | |
237 | ||
238 | static void | |
239 | clear_forwardings(Options *options) | |
240 | { | |
241 | int i; | |
242 | ||
243 | for (i = 0; i < options->num_local_forwards; i++) | |
244 | xfree(options->local_forwards[i].host); | |
245 | options->num_local_forwards = 0; | |
246 | for (i = 0; i < options->num_remote_forwards; i++) | |
247 | xfree(options->remote_forwards[i].host); | |
248 | options->num_remote_forwards = 0; | |
249 | } | |
250 | ||
251 | /* | |
252 | * Returns the number of the token pointed to by cp or oBadOption. | |
253 | */ | |
254 | ||
255 | static OpCodes | |
256 | parse_token(const char *cp, const char *filename, int linenum) | |
257 | { | |
258 | u_int i; | |
259 | ||
260 | for (i = 0; keywords[i].name; i++) | |
261 | if (strcasecmp(cp, keywords[i].name) == 0) | |
262 | return keywords[i].opcode; | |
263 | ||
264 | error("%s: line %d: Bad configuration option: %s", | |
265 | filename, linenum, cp); | |
266 | return oBadOption; | |
267 | } | |
268 | ||
269 | /* | |
270 | * Processes a single option line as used in the configuration files. This | |
271 | * only sets those values that have not already been set. | |
272 | */ | |
273 | #define WHITESPACE " \t\r\n" | |
274 | ||
275 | int | |
276 | process_config_line(Options *options, const char *host, | |
277 | char *line, const char *filename, int linenum, | |
278 | int *activep) | |
279 | { | |
280 | char buf[256], *s, **charptr, *endofnumber, *keyword, *arg; | |
281 | int opcode, *intptr, value; | |
282 | size_t len; | |
283 | u_short fwd_port, fwd_host_port; | |
284 | char sfwd_host_port[6]; | |
285 | ||
286 | /* Strip trailing whitespace */ | |
287 | for(len = strlen(line) - 1; len > 0; len--) { | |
288 | if (strchr(WHITESPACE, line[len]) == NULL) | |
289 | break; | |
290 | line[len] = '\0'; | |
291 | } | |
292 | ||
293 | s = line; | |
294 | /* Get the keyword. (Each line is supposed to begin with a keyword). */ | |
295 | keyword = strdelim(&s); | |
296 | /* Ignore leading whitespace. */ | |
297 | if (*keyword == '\0') | |
298 | keyword = strdelim(&s); | |
299 | if (keyword == NULL || !*keyword || *keyword == '\n' || *keyword == '#') | |
300 | return 0; | |
301 | ||
302 | opcode = parse_token(keyword, filename, linenum); | |
303 | ||
304 | switch (opcode) { | |
305 | case oBadOption: | |
306 | /* don't panic, but count bad options */ | |
307 | return -1; | |
308 | /* NOTREACHED */ | |
309 | case oForwardAgent: | |
310 | intptr = &options->forward_agent; | |
311 | parse_flag: | |
312 | arg = strdelim(&s); | |
313 | if (!arg || *arg == '\0') | |
314 | fatal("%.200s line %d: Missing yes/no argument.", filename, linenum); | |
315 | value = 0; /* To avoid compiler warning... */ | |
316 | if (strcmp(arg, "yes") == 0 || strcmp(arg, "true") == 0) | |
317 | value = 1; | |
318 | else if (strcmp(arg, "no") == 0 || strcmp(arg, "false") == 0) | |
319 | value = 0; | |
320 | else | |
321 | fatal("%.200s line %d: Bad yes/no argument.", filename, linenum); | |
322 | if (*activep && *intptr == -1) | |
323 | *intptr = value; | |
324 | break; | |
325 | ||
326 | case oForwardX11: | |
327 | intptr = &options->forward_x11; | |
328 | goto parse_flag; | |
329 | ||
330 | case oGatewayPorts: | |
331 | intptr = &options->gateway_ports; | |
332 | goto parse_flag; | |
333 | ||
334 | case oUsePrivilegedPort: | |
335 | intptr = &options->use_privileged_port; | |
336 | goto parse_flag; | |
337 | ||
338 | case oRhostsAuthentication: | |
339 | intptr = &options->rhosts_authentication; | |
340 | goto parse_flag; | |
341 | ||
342 | case oPasswordAuthentication: | |
343 | intptr = &options->password_authentication; | |
344 | goto parse_flag; | |
345 | ||
346 | case oKbdInteractiveAuthentication: | |
347 | intptr = &options->kbd_interactive_authentication; | |
348 | goto parse_flag; | |
349 | ||
350 | case oKbdInteractiveDevices: | |
351 | charptr = &options->kbd_interactive_devices; | |
352 | goto parse_string; | |
353 | ||
354 | case oPubkeyAuthentication: | |
355 | intptr = &options->pubkey_authentication; | |
356 | goto parse_flag; | |
357 | ||
358 | case oRSAAuthentication: | |
359 | intptr = &options->rsa_authentication; | |
360 | goto parse_flag; | |
361 | ||
362 | case oRhostsRSAAuthentication: | |
363 | intptr = &options->rhosts_rsa_authentication; | |
364 | goto parse_flag; | |
365 | ||
366 | case oHostbasedAuthentication: | |
367 | intptr = &options->hostbased_authentication; | |
368 | goto parse_flag; | |
369 | ||
370 | case oChallengeResponseAuthentication: | |
371 | intptr = &options->challenge_response_authentication; | |
372 | goto parse_flag; | |
373 | #if defined(KRB4) || defined(KRB5) | |
374 | case oKerberosAuthentication: | |
375 | intptr = &options->kerberos_authentication; | |
376 | goto parse_flag; | |
377 | #endif | |
378 | #if defined(AFS) || defined(KRB5) | |
379 | case oKerberosTgtPassing: | |
380 | intptr = &options->kerberos_tgt_passing; | |
381 | goto parse_flag; | |
382 | #endif | |
383 | #ifdef AFS | |
384 | case oAFSTokenPassing: | |
385 | intptr = &options->afs_token_passing; | |
386 | goto parse_flag; | |
387 | #endif | |
388 | case oBatchMode: | |
389 | intptr = &options->batch_mode; | |
390 | goto parse_flag; | |
391 | ||
392 | case oCheckHostIP: | |
393 | intptr = &options->check_host_ip; | |
394 | goto parse_flag; | |
395 | ||
396 | case oVerifyHostKeyDNS: | |
397 | intptr = &options->verify_host_key_dns; | |
398 | goto parse_flag; | |
399 | ||
400 | case oStrictHostKeyChecking: | |
401 | intptr = &options->strict_host_key_checking; | |
402 | arg = strdelim(&s); | |
403 | if (!arg || *arg == '\0') | |
404 | fatal("%.200s line %d: Missing yes/no/ask argument.", | |
405 | filename, linenum); | |
406 | value = 0; /* To avoid compiler warning... */ | |
407 | if (strcmp(arg, "yes") == 0 || strcmp(arg, "true") == 0) | |
408 | value = 1; | |
409 | else if (strcmp(arg, "no") == 0 || strcmp(arg, "false") == 0) | |
410 | value = 0; | |
411 | else if (strcmp(arg, "ask") == 0) | |
412 | value = 2; | |
413 | else | |
414 | fatal("%.200s line %d: Bad yes/no/ask argument.", filename, linenum); | |
415 | if (*activep && *intptr == -1) | |
416 | *intptr = value; | |
417 | break; | |
418 | ||
419 | case oCompression: | |
420 | intptr = &options->compression; | |
421 | goto parse_flag; | |
422 | ||
423 | case oKeepAlives: | |
424 | intptr = &options->keepalives; | |
425 | goto parse_flag; | |
426 | ||
427 | case oNoHostAuthenticationForLocalhost: | |
428 | intptr = &options->no_host_authentication_for_localhost; | |
429 | goto parse_flag; | |
430 | ||
431 | case oNumberOfPasswordPrompts: | |
432 | intptr = &options->number_of_password_prompts; | |
433 | goto parse_int; | |
434 | ||
435 | case oCompressionLevel: | |
436 | intptr = &options->compression_level; | |
437 | goto parse_int; | |
438 | ||
439 | case oRekeyLimit: | |
440 | intptr = &options->rekey_limit; | |
441 | arg = strdelim(&s); | |
442 | if (!arg || *arg == '\0') | |
443 | fatal("%.200s line %d: Missing argument.", filename, linenum); | |
444 | if (arg[0] < '0' || arg[0] > '9') | |
445 | fatal("%.200s line %d: Bad number.", filename, linenum); | |
446 | value = strtol(arg, &endofnumber, 10); | |
447 | if (arg == endofnumber) | |
448 | fatal("%.200s line %d: Bad number.", filename, linenum); | |
449 | switch (toupper(*endofnumber)) { | |
450 | case 'K': | |
451 | value *= 1<<10; | |
452 | break; | |
453 | case 'M': | |
454 | value *= 1<<20; | |
455 | break; | |
456 | case 'G': | |
457 | value *= 1<<30; | |
458 | break; | |
459 | } | |
460 | if (*activep && *intptr == -1) | |
461 | *intptr = value; | |
462 | break; | |
463 | ||
464 | case oIdentityFile: | |
465 | arg = strdelim(&s); | |
466 | if (!arg || *arg == '\0') | |
467 | fatal("%.200s line %d: Missing argument.", filename, linenum); | |
468 | if (*activep) { | |
469 | intptr = &options->num_identity_files; | |
470 | if (*intptr >= SSH_MAX_IDENTITY_FILES) | |
471 | fatal("%.200s line %d: Too many identity files specified (max %d).", | |
472 | filename, linenum, SSH_MAX_IDENTITY_FILES); | |
473 | charptr = &options->identity_files[*intptr]; | |
474 | *charptr = xstrdup(arg); | |
475 | *intptr = *intptr + 1; | |
476 | } | |
477 | break; | |
478 | ||
479 | case oXAuthLocation: | |
480 | charptr=&options->xauth_location; | |
481 | goto parse_string; | |
482 | ||
483 | case oUser: | |
484 | charptr = &options->user; | |
485 | parse_string: | |
486 | arg = strdelim(&s); | |
487 | if (!arg || *arg == '\0') | |
488 | fatal("%.200s line %d: Missing argument.", filename, linenum); | |
489 | if (*activep && *charptr == NULL) | |
490 | *charptr = xstrdup(arg); | |
491 | break; | |
492 | ||
493 | case oGlobalKnownHostsFile: | |
494 | charptr = &options->system_hostfile; | |
495 | goto parse_string; | |
496 | ||
497 | case oUserKnownHostsFile: | |
498 | charptr = &options->user_hostfile; | |
499 | goto parse_string; | |
500 | ||
501 | case oGlobalKnownHostsFile2: | |
502 | charptr = &options->system_hostfile2; | |
503 | goto parse_string; | |
504 | ||
505 | case oUserKnownHostsFile2: | |
506 | charptr = &options->user_hostfile2; | |
507 | goto parse_string; | |
508 | ||
509 | case oHostName: | |
510 | charptr = &options->hostname; | |
511 | goto parse_string; | |
512 | ||
513 | case oHostKeyAlias: | |
514 | charptr = &options->host_key_alias; | |
515 | goto parse_string; | |
516 | ||
517 | case oPreferredAuthentications: | |
518 | charptr = &options->preferred_authentications; | |
519 | goto parse_string; | |
520 | ||
521 | case oBindAddress: | |
522 | charptr = &options->bind_address; | |
523 | goto parse_string; | |
524 | ||
525 | case oSmartcardDevice: | |
526 | charptr = &options->smartcard_device; | |
527 | goto parse_string; | |
528 | ||
529 | case oProxyCommand: | |
530 | charptr = &options->proxy_command; | |
531 | len = strspn(s, WHITESPACE "="); | |
532 | if (*activep && *charptr == NULL) | |
533 | *charptr = xstrdup(s + len); | |
534 | return 0; | |
535 | ||
536 | case oPort: | |
537 | intptr = &options->port; | |
538 | parse_int: | |
539 | arg = strdelim(&s); | |
540 | if (!arg || *arg == '\0') | |
541 | fatal("%.200s line %d: Missing argument.", filename, linenum); | |
542 | if (arg[0] < '0' || arg[0] > '9') | |
543 | fatal("%.200s line %d: Bad number.", filename, linenum); | |
544 | ||
545 | /* Octal, decimal, or hex format? */ | |
546 | value = strtol(arg, &endofnumber, 0); | |
547 | if (arg == endofnumber) | |
548 | fatal("%.200s line %d: Bad number.", filename, linenum); | |
549 | if (*activep && *intptr == -1) | |
550 | *intptr = value; | |
551 | break; | |
552 | ||
553 | case oConnectionAttempts: | |
554 | intptr = &options->connection_attempts; | |
555 | goto parse_int; | |
556 | ||
557 | case oCipher: | |
558 | intptr = &options->cipher; | |
559 | arg = strdelim(&s); | |
560 | if (!arg || *arg == '\0') | |
561 | fatal("%.200s line %d: Missing argument.", filename, linenum); | |
562 | value = cipher_number(arg); | |
563 | if (value == -1) | |
564 | fatal("%.200s line %d: Bad cipher '%s'.", | |
565 | filename, linenum, arg ? arg : "<NONE>"); | |
566 | if (*activep && *intptr == -1) | |
567 | *intptr = value; | |
568 | break; | |
569 | ||
570 | case oCiphers: | |
571 | arg = strdelim(&s); | |
572 | if (!arg || *arg == '\0') | |
573 | fatal("%.200s line %d: Missing argument.", filename, linenum); | |
574 | if (!ciphers_valid(arg)) | |
575 | fatal("%.200s line %d: Bad SSH2 cipher spec '%s'.", | |
576 | filename, linenum, arg ? arg : "<NONE>"); | |
577 | if (*activep && options->ciphers == NULL) | |
578 | options->ciphers = xstrdup(arg); | |
579 | break; | |
580 | ||
581 | case oMacs: | |
582 | arg = strdelim(&s); | |
583 | if (!arg || *arg == '\0') | |
584 | fatal("%.200s line %d: Missing argument.", filename, linenum); | |
585 | if (!mac_valid(arg)) | |
586 | fatal("%.200s line %d: Bad SSH2 Mac spec '%s'.", | |
587 | filename, linenum, arg ? arg : "<NONE>"); | |
588 | if (*activep && options->macs == NULL) | |
589 | options->macs = xstrdup(arg); | |
590 | break; | |
591 | ||
592 | case oHostKeyAlgorithms: | |
593 | arg = strdelim(&s); | |
594 | if (!arg || *arg == '\0') | |
595 | fatal("%.200s line %d: Missing argument.", filename, linenum); | |
596 | if (!key_names_valid2(arg)) | |
597 | fatal("%.200s line %d: Bad protocol 2 host key algorithms '%s'.", | |
598 | filename, linenum, arg ? arg : "<NONE>"); | |
599 | if (*activep && options->hostkeyalgorithms == NULL) | |
600 | options->hostkeyalgorithms = xstrdup(arg); | |
601 | break; | |
602 | ||
603 | case oProtocol: | |
604 | intptr = &options->protocol; | |
605 | arg = strdelim(&s); | |
606 | if (!arg || *arg == '\0') | |
607 | fatal("%.200s line %d: Missing argument.", filename, linenum); | |
608 | value = proto_spec(arg); | |
609 | if (value == SSH_PROTO_UNKNOWN) | |
610 | fatal("%.200s line %d: Bad protocol spec '%s'.", | |
611 | filename, linenum, arg ? arg : "<NONE>"); | |
612 | if (*activep && *intptr == SSH_PROTO_UNKNOWN) | |
613 | *intptr = value; | |
614 | break; | |
615 | ||
616 | case oLogLevel: | |
617 | intptr = (int *) &options->log_level; | |
618 | arg = strdelim(&s); | |
619 | value = log_level_number(arg); | |
620 | if (value == SYSLOG_LEVEL_NOT_SET) | |
621 | fatal("%.200s line %d: unsupported log level '%s'", | |
622 | filename, linenum, arg ? arg : "<NONE>"); | |
623 | if (*activep && (LogLevel) *intptr == SYSLOG_LEVEL_NOT_SET) | |
624 | *intptr = (LogLevel) value; | |
625 | break; | |
626 | ||
627 | case oLocalForward: | |
628 | case oRemoteForward: | |
629 | arg = strdelim(&s); | |
630 | if (!arg || *arg == '\0') | |
631 | fatal("%.200s line %d: Missing port argument.", | |
632 | filename, linenum); | |
633 | if ((fwd_port = a2port(arg)) == 0) | |
634 | fatal("%.200s line %d: Bad listen port.", | |
635 | filename, linenum); | |
636 | arg = strdelim(&s); | |
637 | if (!arg || *arg == '\0') | |
638 | fatal("%.200s line %d: Missing second argument.", | |
639 | filename, linenum); | |
640 | if (sscanf(arg, "%255[^:]:%5[0-9]", buf, sfwd_host_port) != 2 && | |
641 | sscanf(arg, "%255[^/]/%5[0-9]", buf, sfwd_host_port) != 2) | |
642 | fatal("%.200s line %d: Bad forwarding specification.", | |
643 | filename, linenum); | |
644 | if ((fwd_host_port = a2port(sfwd_host_port)) == 0) | |
645 | fatal("%.200s line %d: Bad forwarding port.", | |
646 | filename, linenum); | |
647 | if (*activep) { | |
648 | if (opcode == oLocalForward) | |
649 | add_local_forward(options, fwd_port, buf, | |
650 | fwd_host_port); | |
651 | else if (opcode == oRemoteForward) | |
652 | add_remote_forward(options, fwd_port, buf, | |
653 | fwd_host_port); | |
654 | } | |
655 | break; | |
656 | ||
657 | case oDynamicForward: | |
658 | arg = strdelim(&s); | |
659 | if (!arg || *arg == '\0') | |
660 | fatal("%.200s line %d: Missing port argument.", | |
661 | filename, linenum); | |
662 | fwd_port = a2port(arg); | |
663 | if (fwd_port == 0) | |
664 | fatal("%.200s line %d: Badly formatted port number.", | |
665 | filename, linenum); | |
666 | if (*activep) | |
667 | add_local_forward(options, fwd_port, "socks4", 0); | |
668 | break; | |
669 | ||
670 | case oClearAllForwardings: | |
671 | intptr = &options->clear_forwardings; | |
672 | goto parse_flag; | |
673 | ||
674 | case oHost: | |
675 | *activep = 0; | |
676 | while ((arg = strdelim(&s)) != NULL && *arg != '\0') | |
677 | if (match_pattern(host, arg)) { | |
678 | debug("Applying options for %.100s", arg); | |
679 | *activep = 1; | |
680 | break; | |
681 | } | |
682 | /* Avoid garbage check below, as strdelim is done. */ | |
683 | return 0; | |
684 | ||
685 | case oEscapeChar: | |
686 | intptr = &options->escape_char; | |
687 | arg = strdelim(&s); | |
688 | if (!arg || *arg == '\0') | |
689 | fatal("%.200s line %d: Missing argument.", filename, linenum); | |
690 | if (arg[0] == '^' && arg[2] == 0 && | |
691 | (u_char) arg[1] >= 64 && (u_char) arg[1] < 128) | |
692 | value = (u_char) arg[1] & 31; | |
693 | else if (strlen(arg) == 1) | |
694 | value = (u_char) arg[0]; | |
695 | else if (strcmp(arg, "none") == 0) | |
696 | value = SSH_ESCAPECHAR_NONE; | |
697 | else { | |
698 | fatal("%.200s line %d: Bad escape character.", | |
699 | filename, linenum); | |
700 | /* NOTREACHED */ | |
701 | value = 0; /* Avoid compiler warning. */ | |
702 | } | |
703 | if (*activep && *intptr == -1) | |
704 | *intptr = value; | |
705 | break; | |
706 | ||
707 | case oEnableSSHKeysign: | |
708 | intptr = &options->enable_ssh_keysign; | |
709 | goto parse_flag; | |
710 | ||
711 | case oDeprecated: | |
712 | debug("%s line %d: Deprecated option \"%s\"", | |
713 | filename, linenum, keyword); | |
714 | return 0; | |
715 | ||
716 | default: | |
717 | fatal("process_config_line: Unimplemented opcode %d", opcode); | |
718 | } | |
719 | ||
720 | /* Check that there is no garbage at end of line. */ | |
721 | if ((arg = strdelim(&s)) != NULL && *arg != '\0') { | |
722 | fatal("%.200s line %d: garbage at end of line; \"%.200s\".", | |
723 | filename, linenum, arg); | |
724 | } | |
725 | return 0; | |
726 | } | |
727 | ||
728 | ||
729 | /* | |
730 | * Reads the config file and modifies the options accordingly. Options | |
731 | * should already be initialized before this call. This never returns if | |
732 | * there is an error. If the file does not exist, this returns 0. | |
733 | */ | |
734 | ||
735 | int | |
736 | read_config_file(const char *filename, const char *host, Options *options) | |
737 | { | |
738 | FILE *f; | |
739 | char line[1024]; | |
740 | int active, linenum; | |
741 | int bad_options = 0; | |
742 | ||
743 | /* Open the file. */ | |
744 | f = fopen(filename, "r"); | |
745 | if (!f) | |
746 | return 0; | |
747 | ||
748 | debug("Reading configuration data %.200s", filename); | |
749 | ||
750 | /* | |
751 | * Mark that we are now processing the options. This flag is turned | |
752 | * on/off by Host specifications. | |
753 | */ | |
754 | active = 1; | |
755 | linenum = 0; | |
756 | while (fgets(line, sizeof(line), f)) { | |
757 | /* Update line number counter. */ | |
758 | linenum++; | |
759 | if (process_config_line(options, host, line, filename, linenum, &active) != 0) | |
760 | bad_options++; | |
761 | } | |
762 | fclose(f); | |
763 | if (bad_options > 0) | |
764 | fatal("%s: terminating, %d bad configuration options", | |
765 | filename, bad_options); | |
766 | return 1; | |
767 | } | |
768 | ||
769 | /* | |
770 | * Initializes options to special values that indicate that they have not yet | |
771 | * been set. Read_config_file will only set options with this value. Options | |
772 | * are processed in the following order: command line, user config file, | |
773 | * system config file. Last, fill_default_options is called. | |
774 | */ | |
775 | ||
776 | void | |
777 | initialize_options(Options * options) | |
778 | { | |
779 | memset(options, 'X', sizeof(*options)); | |
780 | options->forward_agent = -1; | |
781 | options->forward_x11 = -1; | |
782 | options->xauth_location = NULL; | |
783 | options->gateway_ports = -1; | |
784 | options->use_privileged_port = -1; | |
785 | options->rhosts_authentication = -1; | |
786 | options->rsa_authentication = -1; | |
787 | options->pubkey_authentication = -1; | |
788 | options->challenge_response_authentication = -1; | |
789 | #if defined(KRB4) || defined(KRB5) | |
790 | options->kerberos_authentication = -1; | |
791 | #endif | |
792 | #if defined(AFS) || defined(KRB5) | |
793 | options->kerberos_tgt_passing = -1; | |
794 | #endif | |
795 | #ifdef AFS | |
796 | options->afs_token_passing = -1; | |
797 | #endif | |
798 | options->password_authentication = -1; | |
799 | options->kbd_interactive_authentication = -1; | |
800 | options->kbd_interactive_devices = NULL; | |
801 | options->rhosts_rsa_authentication = -1; | |
802 | options->hostbased_authentication = -1; | |
803 | options->batch_mode = -1; | |
804 | options->check_host_ip = -1; | |
805 | options->strict_host_key_checking = -1; | |
806 | options->compression = -1; | |
807 | options->keepalives = -1; | |
808 | options->compression_level = -1; | |
809 | options->port = -1; | |
810 | options->connection_attempts = -1; | |
811 | options->number_of_password_prompts = -1; | |
812 | options->cipher = -1; | |
813 | options->ciphers = NULL; | |
814 | options->macs = NULL; | |
815 | options->hostkeyalgorithms = NULL; | |
816 | options->protocol = SSH_PROTO_UNKNOWN; | |
817 | options->num_identity_files = 0; | |
818 | options->hostname = NULL; | |
819 | options->host_key_alias = NULL; | |
820 | options->proxy_command = NULL; | |
821 | options->user = NULL; | |
822 | options->escape_char = -1; | |
823 | options->system_hostfile = NULL; | |
824 | options->user_hostfile = NULL; | |
825 | options->system_hostfile2 = NULL; | |
826 | options->user_hostfile2 = NULL; | |
827 | options->num_local_forwards = 0; | |
828 | options->num_remote_forwards = 0; | |
829 | options->clear_forwardings = -1; | |
830 | options->log_level = SYSLOG_LEVEL_NOT_SET; | |
831 | options->preferred_authentications = NULL; | |
832 | options->bind_address = NULL; | |
833 | options->smartcard_device = NULL; | |
834 | options->enable_ssh_keysign = - 1; | |
835 | options->no_host_authentication_for_localhost = - 1; | |
836 | options->rekey_limit = - 1; | |
837 | options->verify_host_key_dns = -1; | |
838 | } | |
839 | ||
840 | /* | |
841 | * Called after processing other sources of option data, this fills those | |
842 | * options for which no value has been specified with their default values. | |
843 | */ | |
844 | ||
845 | void | |
846 | fill_default_options(Options * options) | |
847 | { | |
848 | int len; | |
849 | ||
850 | if (options->forward_agent == -1) | |
851 | options->forward_agent = 0; | |
852 | if (options->forward_x11 == -1) | |
853 | options->forward_x11 = 0; | |
854 | if (options->xauth_location == NULL) | |
855 | options->xauth_location = _PATH_XAUTH; | |
856 | if (options->gateway_ports == -1) | |
857 | options->gateway_ports = 0; | |
858 | if (options->use_privileged_port == -1) | |
859 | options->use_privileged_port = 0; | |
860 | if (options->rhosts_authentication == -1) | |
861 | options->rhosts_authentication = 0; | |
862 | if (options->rsa_authentication == -1) | |
863 | options->rsa_authentication = 1; | |
864 | if (options->pubkey_authentication == -1) | |
865 | options->pubkey_authentication = 1; | |
866 | if (options->challenge_response_authentication == -1) | |
867 | options->challenge_response_authentication = 1; | |
868 | #if defined(KRB4) || defined(KRB5) | |
869 | if (options->kerberos_authentication == -1) | |
870 | options->kerberos_authentication = 1; | |
871 | #endif | |
872 | #if defined(AFS) || defined(KRB5) | |
873 | if (options->kerberos_tgt_passing == -1) | |
874 | options->kerberos_tgt_passing = 1; | |
875 | #endif | |
876 | #ifdef AFS | |
877 | if (options->afs_token_passing == -1) | |
878 | options->afs_token_passing = 1; | |
879 | #endif | |
880 | if (options->password_authentication == -1) | |
881 | options->password_authentication = 1; | |
882 | if (options->kbd_interactive_authentication == -1) | |
883 | options->kbd_interactive_authentication = 1; | |
884 | if (options->rhosts_rsa_authentication == -1) | |
885 | options->rhosts_rsa_authentication = 0; | |
886 | if (options->hostbased_authentication == -1) | |
887 | options->hostbased_authentication = 0; | |
888 | if (options->batch_mode == -1) | |
889 | options->batch_mode = 0; | |
890 | if (options->check_host_ip == -1) | |
891 | options->check_host_ip = 1; | |
892 | if (options->strict_host_key_checking == -1) | |
893 | options->strict_host_key_checking = 2; /* 2 is default */ | |
894 | if (options->compression == -1) | |
895 | options->compression = 0; | |
896 | if (options->keepalives == -1) | |
897 | options->keepalives = 1; | |
898 | if (options->compression_level == -1) | |
899 | options->compression_level = 6; | |
900 | if (options->port == -1) | |
901 | options->port = 0; /* Filled in ssh_connect. */ | |
902 | if (options->connection_attempts == -1) | |
903 | options->connection_attempts = 1; | |
904 | if (options->number_of_password_prompts == -1) | |
905 | options->number_of_password_prompts = 3; | |
906 | /* Selected in ssh_login(). */ | |
907 | if (options->cipher == -1) | |
908 | options->cipher = SSH_CIPHER_NOT_SET; | |
909 | /* options->ciphers, default set in myproposals.h */ | |
910 | /* options->macs, default set in myproposals.h */ | |
911 | /* options->hostkeyalgorithms, default set in myproposals.h */ | |
912 | if (options->protocol == SSH_PROTO_UNKNOWN) | |
913 | options->protocol = SSH_PROTO_1|SSH_PROTO_2; | |
914 | if (options->num_identity_files == 0) { | |
915 | if (options->protocol & SSH_PROTO_1) { | |
916 | len = 2 + strlen(_PATH_SSH_CLIENT_IDENTITY) + 1; | |
917 | options->identity_files[options->num_identity_files] = | |
918 | xmalloc(len); | |
919 | snprintf(options->identity_files[options->num_identity_files++], | |
920 | len, "~/%.100s", _PATH_SSH_CLIENT_IDENTITY); | |
921 | } | |
922 | if (options->protocol & SSH_PROTO_2) { | |
923 | len = 2 + strlen(_PATH_SSH_CLIENT_ID_RSA) + 1; | |
924 | options->identity_files[options->num_identity_files] = | |
925 | xmalloc(len); | |
926 | snprintf(options->identity_files[options->num_identity_files++], | |
927 | len, "~/%.100s", _PATH_SSH_CLIENT_ID_RSA); | |
928 | ||
929 | len = 2 + strlen(_PATH_SSH_CLIENT_ID_DSA) + 1; | |
930 | options->identity_files[options->num_identity_files] = | |
931 | xmalloc(len); | |
932 | snprintf(options->identity_files[options->num_identity_files++], | |
933 | len, "~/%.100s", _PATH_SSH_CLIENT_ID_DSA); | |
934 | } | |
935 | } | |
936 | if (options->escape_char == -1) | |
937 | options->escape_char = '~'; | |
938 | if (options->system_hostfile == NULL) | |
939 | options->system_hostfile = _PATH_SSH_SYSTEM_HOSTFILE; | |
940 | if (options->user_hostfile == NULL) | |
941 | options->user_hostfile = _PATH_SSH_USER_HOSTFILE; | |
942 | if (options->system_hostfile2 == NULL) | |
943 | options->system_hostfile2 = _PATH_SSH_SYSTEM_HOSTFILE2; | |
944 | if (options->user_hostfile2 == NULL) | |
945 | options->user_hostfile2 = _PATH_SSH_USER_HOSTFILE2; | |
946 | if (options->log_level == SYSLOG_LEVEL_NOT_SET) | |
947 | options->log_level = SYSLOG_LEVEL_INFO; | |
948 | if (options->clear_forwardings == 1) | |
949 | clear_forwardings(options); | |
950 | if (options->no_host_authentication_for_localhost == - 1) | |
951 | options->no_host_authentication_for_localhost = 0; | |
952 | if (options->enable_ssh_keysign == -1) | |
953 | options->enable_ssh_keysign = 0; | |
954 | if (options->rekey_limit == -1) | |
955 | options->rekey_limit = 0; | |
956 | if (options->verify_host_key_dns == -1) | |
957 | options->verify_host_key_dns = 0; | |
958 | /* options->proxy_command should not be set by default */ | |
959 | /* options->user will be set in the main program if appropriate */ | |
960 | /* options->hostname will be set in the main program if appropriate */ | |
961 | /* options->host_key_alias should not be set by default */ | |
962 | /* options->preferred_authentications will be set in ssh */ | |
963 | } |