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3c0ef626 | 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" | |
44a053a3 | 15 | RCSID("$OpenBSD: readconf.c,v 1.100 2002/06/19 00:27:55 deraadt Exp $"); |
3c0ef626 | 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 | |
44a053a3 | 44 | User foo |
3c0ef626 | 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 | |
44a053a3 | 68 | PublicKeyAuthentication no |
3c0ef626 | 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 | |
3c0ef626 | 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, | |
44a053a3 | 95 | oPasswordAuthentication, oRSAAuthentication, |
3c0ef626 | 96 | oChallengeResponseAuthentication, oXAuthLocation, |
97 | #if defined(KRB4) || defined(KRB5) | |
98 | oKerberosAuthentication, | |
99 | #endif | |
5598e598 | 100 | #ifdef GSSAPI |
101 | oGssAuthentication, oGssDelegateCreds, | |
102 | #ifdef GSI | |
103 | oGssGlobusDelegateLimitedCreds, | |
104 | #endif /* GSI */ | |
105 | #endif /* GSSAPI */ | |
3c0ef626 | 106 | #if defined(AFS) || defined(KRB5) |
107 | oKerberosTgtPassing, | |
108 | #endif | |
109 | #ifdef AFS | |
110 | oAFSTokenPassing, | |
111 | #endif | |
112 | oIdentityFile, oHostName, oPort, oCipher, oRemoteForward, oLocalForward, | |
113 | oUser, oHost, oEscapeChar, oRhostsRSAAuthentication, oProxyCommand, | |
114 | oGlobalKnownHostsFile, oUserKnownHostsFile, oConnectionAttempts, | |
115 | oBatchMode, oCheckHostIP, oStrictHostKeyChecking, oCompression, | |
116 | oCompressionLevel, oKeepAlives, oNumberOfPasswordPrompts, | |
117 | oUsePrivilegedPort, oLogLevel, oCiphers, oProtocol, oMacs, | |
118 | oGlobalKnownHostsFile2, oUserKnownHostsFile2, oPubkeyAuthentication, | |
119 | oKbdInteractiveAuthentication, oKbdInteractiveDevices, oHostKeyAlias, | |
120 | oDynamicForward, oPreferredAuthentications, oHostbasedAuthentication, | |
121 | oHostKeyAlgorithms, oBindAddress, oSmartcardDevice, | |
44a053a3 | 122 | oClearAllForwardings, oNoHostAuthenticationForLocalhost, |
123 | oDeprecated | |
3c0ef626 | 124 | } OpCodes; |
125 | ||
126 | /* Textual representations of the tokens. */ | |
127 | ||
128 | static struct { | |
129 | const char *name; | |
130 | OpCodes opcode; | |
131 | } keywords[] = { | |
132 | { "forwardagent", oForwardAgent }, | |
133 | { "forwardx11", oForwardX11 }, | |
134 | { "xauthlocation", oXAuthLocation }, | |
135 | { "gatewayports", oGatewayPorts }, | |
136 | { "useprivilegedport", oUsePrivilegedPort }, | |
137 | { "rhostsauthentication", oRhostsAuthentication }, | |
138 | { "passwordauthentication", oPasswordAuthentication }, | |
139 | { "kbdinteractiveauthentication", oKbdInteractiveAuthentication }, | |
140 | { "kbdinteractivedevices", oKbdInteractiveDevices }, | |
141 | { "rsaauthentication", oRSAAuthentication }, | |
142 | { "pubkeyauthentication", oPubkeyAuthentication }, | |
143 | { "dsaauthentication", oPubkeyAuthentication }, /* alias */ | |
144 | { "rhostsrsaauthentication", oRhostsRSAAuthentication }, | |
145 | { "hostbasedauthentication", oHostbasedAuthentication }, | |
146 | { "challengeresponseauthentication", oChallengeResponseAuthentication }, | |
147 | { "skeyauthentication", oChallengeResponseAuthentication }, /* alias */ | |
148 | { "tisauthentication", oChallengeResponseAuthentication }, /* alias */ | |
149 | #if defined(KRB4) || defined(KRB5) | |
150 | { "kerberosauthentication", oKerberosAuthentication }, | |
151 | #endif | |
5598e598 | 152 | #ifdef GSSAPI |
153 | { "gssapiauthentication", oGssAuthentication }, | |
154 | { "gssapidelegatecredentials", oGssDelegateCreds }, | |
155 | #ifdef GSI | |
156 | /* For backwards compatability with old 1.2.27 client code */ | |
157 | { "forwardgssapiglobusproxy", oGssDelegateCreds }, /* alias */ | |
158 | { "forwardgssapiglobuslimitedproxy", oGssGlobusDelegateLimitedCreds }, | |
159 | #endif /* GSI */ | |
160 | #endif /* GSSAPI */ | |
3c0ef626 | 161 | #if defined(AFS) || defined(KRB5) |
162 | { "kerberostgtpassing", oKerberosTgtPassing }, | |
163 | #endif | |
164 | #ifdef AFS | |
165 | { "afstokenpassing", oAFSTokenPassing }, | |
166 | #endif | |
44a053a3 | 167 | { "fallbacktorsh", oDeprecated }, |
168 | { "usersh", oDeprecated }, | |
3c0ef626 | 169 | { "identityfile", oIdentityFile }, |
170 | { "identityfile2", oIdentityFile }, /* alias */ | |
171 | { "hostname", oHostName }, | |
172 | { "hostkeyalias", oHostKeyAlias }, | |
173 | { "proxycommand", oProxyCommand }, | |
174 | { "port", oPort }, | |
175 | { "cipher", oCipher }, | |
176 | { "ciphers", oCiphers }, | |
177 | { "macs", oMacs }, | |
178 | { "protocol", oProtocol }, | |
179 | { "remoteforward", oRemoteForward }, | |
180 | { "localforward", oLocalForward }, | |
181 | { "user", oUser }, | |
182 | { "host", oHost }, | |
183 | { "escapechar", oEscapeChar }, | |
184 | { "globalknownhostsfile", oGlobalKnownHostsFile }, | |
185 | { "userknownhostsfile", oUserKnownHostsFile }, /* obsolete */ | |
186 | { "globalknownhostsfile2", oGlobalKnownHostsFile2 }, | |
187 | { "userknownhostsfile2", oUserKnownHostsFile2 }, /* obsolete */ | |
188 | { "connectionattempts", oConnectionAttempts }, | |
189 | { "batchmode", oBatchMode }, | |
190 | { "checkhostip", oCheckHostIP }, | |
191 | { "stricthostkeychecking", oStrictHostKeyChecking }, | |
192 | { "compression", oCompression }, | |
193 | { "compressionlevel", oCompressionLevel }, | |
194 | { "keepalive", oKeepAlives }, | |
195 | { "numberofpasswordprompts", oNumberOfPasswordPrompts }, | |
196 | { "loglevel", oLogLevel }, | |
197 | { "dynamicforward", oDynamicForward }, | |
198 | { "preferredauthentications", oPreferredAuthentications }, | |
199 | { "hostkeyalgorithms", oHostKeyAlgorithms }, | |
200 | { "bindaddress", oBindAddress }, | |
201 | { "smartcarddevice", oSmartcardDevice }, | |
e9702f7d | 202 | { "clearallforwardings", oClearAllForwardings }, |
203 | { "nohostauthenticationforlocalhost", oNoHostAuthenticationForLocalhost }, | |
204 | { NULL, oBadOption } | |
3c0ef626 | 205 | }; |
206 | ||
207 | /* | |
208 | * Adds a local TCP/IP port forward to options. Never returns if there is an | |
209 | * error. | |
210 | */ | |
211 | ||
212 | void | |
213 | add_local_forward(Options *options, u_short port, const char *host, | |
214 | u_short host_port) | |
215 | { | |
216 | Forward *fwd; | |
217 | #ifndef HAVE_CYGWIN | |
218 | extern uid_t original_real_uid; | |
219 | if (port < IPPORT_RESERVED && original_real_uid != 0) | |
220 | fatal("Privileged ports can only be forwarded by root."); | |
221 | #endif | |
222 | if (options->num_local_forwards >= SSH_MAX_FORWARDS_PER_DIRECTION) | |
223 | fatal("Too many local forwards (max %d).", SSH_MAX_FORWARDS_PER_DIRECTION); | |
224 | fwd = &options->local_forwards[options->num_local_forwards++]; | |
225 | fwd->port = port; | |
226 | fwd->host = xstrdup(host); | |
227 | fwd->host_port = host_port; | |
228 | } | |
229 | ||
230 | /* | |
231 | * Adds a remote TCP/IP port forward to options. Never returns if there is | |
232 | * an error. | |
233 | */ | |
234 | ||
235 | void | |
236 | add_remote_forward(Options *options, u_short port, const char *host, | |
237 | u_short host_port) | |
238 | { | |
239 | Forward *fwd; | |
240 | if (options->num_remote_forwards >= SSH_MAX_FORWARDS_PER_DIRECTION) | |
241 | fatal("Too many remote forwards (max %d).", | |
e9702f7d | 242 | SSH_MAX_FORWARDS_PER_DIRECTION); |
3c0ef626 | 243 | fwd = &options->remote_forwards[options->num_remote_forwards++]; |
244 | fwd->port = port; | |
245 | fwd->host = xstrdup(host); | |
246 | fwd->host_port = host_port; | |
247 | } | |
248 | ||
249 | static void | |
250 | clear_forwardings(Options *options) | |
251 | { | |
252 | int i; | |
253 | ||
254 | for (i = 0; i < options->num_local_forwards; i++) | |
255 | xfree(options->local_forwards[i].host); | |
256 | options->num_local_forwards = 0; | |
257 | for (i = 0; i < options->num_remote_forwards; i++) | |
258 | xfree(options->remote_forwards[i].host); | |
259 | options->num_remote_forwards = 0; | |
260 | } | |
261 | ||
262 | /* | |
263 | * Returns the number of the token pointed to by cp or oBadOption. | |
264 | */ | |
265 | ||
266 | static OpCodes | |
267 | parse_token(const char *cp, const char *filename, int linenum) | |
268 | { | |
269 | u_int i; | |
270 | ||
271 | for (i = 0; keywords[i].name; i++) | |
272 | if (strcasecmp(cp, keywords[i].name) == 0) | |
273 | return keywords[i].opcode; | |
274 | ||
275 | error("%s: line %d: Bad configuration option: %s", | |
276 | filename, linenum, cp); | |
277 | return oBadOption; | |
278 | } | |
279 | ||
280 | /* | |
281 | * Processes a single option line as used in the configuration files. This | |
282 | * only sets those values that have not already been set. | |
283 | */ | |
284 | ||
285 | int | |
286 | process_config_line(Options *options, const char *host, | |
287 | char *line, const char *filename, int linenum, | |
288 | int *activep) | |
289 | { | |
290 | char buf[256], *s, *string, **charptr, *endofnumber, *keyword, *arg; | |
291 | int opcode, *intptr, value; | |
292 | u_short fwd_port, fwd_host_port; | |
293 | char sfwd_host_port[6]; | |
294 | ||
295 | s = line; | |
296 | /* Get the keyword. (Each line is supposed to begin with a keyword). */ | |
297 | keyword = strdelim(&s); | |
298 | /* Ignore leading whitespace. */ | |
299 | if (*keyword == '\0') | |
300 | keyword = strdelim(&s); | |
301 | if (keyword == NULL || !*keyword || *keyword == '\n' || *keyword == '#') | |
302 | return 0; | |
303 | ||
304 | opcode = parse_token(keyword, filename, linenum); | |
305 | ||
306 | switch (opcode) { | |
307 | case oBadOption: | |
308 | /* don't panic, but count bad options */ | |
309 | return -1; | |
310 | /* NOTREACHED */ | |
311 | case oForwardAgent: | |
312 | intptr = &options->forward_agent; | |
313 | parse_flag: | |
314 | arg = strdelim(&s); | |
315 | if (!arg || *arg == '\0') | |
316 | fatal("%.200s line %d: Missing yes/no argument.", filename, linenum); | |
317 | value = 0; /* To avoid compiler warning... */ | |
318 | if (strcmp(arg, "yes") == 0 || strcmp(arg, "true") == 0) | |
319 | value = 1; | |
320 | else if (strcmp(arg, "no") == 0 || strcmp(arg, "false") == 0) | |
321 | value = 0; | |
322 | else | |
323 | fatal("%.200s line %d: Bad yes/no argument.", filename, linenum); | |
324 | if (*activep && *intptr == -1) | |
325 | *intptr = value; | |
326 | break; | |
327 | ||
328 | case oForwardX11: | |
329 | intptr = &options->forward_x11; | |
330 | goto parse_flag; | |
331 | ||
332 | case oGatewayPorts: | |
333 | intptr = &options->gateway_ports; | |
334 | goto parse_flag; | |
335 | ||
336 | case oUsePrivilegedPort: | |
337 | intptr = &options->use_privileged_port; | |
338 | goto parse_flag; | |
339 | ||
340 | case oRhostsAuthentication: | |
341 | intptr = &options->rhosts_authentication; | |
342 | goto parse_flag; | |
343 | ||
344 | case oPasswordAuthentication: | |
345 | intptr = &options->password_authentication; | |
346 | goto parse_flag; | |
347 | ||
348 | case oKbdInteractiveAuthentication: | |
349 | intptr = &options->kbd_interactive_authentication; | |
350 | goto parse_flag; | |
351 | ||
352 | case oKbdInteractiveDevices: | |
353 | charptr = &options->kbd_interactive_devices; | |
354 | goto parse_string; | |
355 | ||
356 | case oPubkeyAuthentication: | |
357 | intptr = &options->pubkey_authentication; | |
358 | goto parse_flag; | |
359 | ||
360 | case oRSAAuthentication: | |
361 | intptr = &options->rsa_authentication; | |
362 | goto parse_flag; | |
363 | ||
364 | case oRhostsRSAAuthentication: | |
365 | intptr = &options->rhosts_rsa_authentication; | |
366 | goto parse_flag; | |
367 | ||
368 | case oHostbasedAuthentication: | |
369 | intptr = &options->hostbased_authentication; | |
370 | goto parse_flag; | |
371 | ||
372 | case oChallengeResponseAuthentication: | |
373 | intptr = &options->challenge_response_authentication; | |
374 | goto parse_flag; | |
375 | #if defined(KRB4) || defined(KRB5) | |
376 | case oKerberosAuthentication: | |
377 | intptr = &options->kerberos_authentication; | |
378 | goto parse_flag; | |
379 | #endif | |
5598e598 | 380 | #ifdef GSSAPI |
381 | case oGssAuthentication: | |
382 | intptr = &options->gss_authentication; | |
383 | goto parse_flag; | |
384 | ||
385 | case oGssDelegateCreds: | |
386 | intptr = &options->gss_deleg_creds; | |
387 | goto parse_flag; | |
388 | ||
389 | #ifdef GSI | |
390 | case oGssGlobusDelegateLimitedCreds: | |
391 | intptr = &options->gss_globus_deleg_limited_proxy; | |
392 | goto parse_flag; | |
393 | #endif /* GSI */ | |
394 | ||
395 | #endif /* GSSAPI */ | |
396 | ||
3c0ef626 | 397 | #if defined(AFS) || defined(KRB5) |
398 | case oKerberosTgtPassing: | |
399 | intptr = &options->kerberos_tgt_passing; | |
400 | goto parse_flag; | |
401 | #endif | |
402 | #ifdef AFS | |
403 | case oAFSTokenPassing: | |
404 | intptr = &options->afs_token_passing; | |
405 | goto parse_flag; | |
406 | #endif | |
3c0ef626 | 407 | case oBatchMode: |
408 | intptr = &options->batch_mode; | |
409 | goto parse_flag; | |
410 | ||
411 | case oCheckHostIP: | |
412 | intptr = &options->check_host_ip; | |
413 | goto parse_flag; | |
414 | ||
415 | case oStrictHostKeyChecking: | |
416 | intptr = &options->strict_host_key_checking; | |
417 | arg = strdelim(&s); | |
418 | if (!arg || *arg == '\0') | |
419 | fatal("%.200s line %d: Missing yes/no/ask argument.", | |
e9702f7d | 420 | filename, linenum); |
3c0ef626 | 421 | value = 0; /* To avoid compiler warning... */ |
422 | if (strcmp(arg, "yes") == 0 || strcmp(arg, "true") == 0) | |
423 | value = 1; | |
424 | else if (strcmp(arg, "no") == 0 || strcmp(arg, "false") == 0) | |
425 | value = 0; | |
426 | else if (strcmp(arg, "ask") == 0) | |
427 | value = 2; | |
428 | else | |
429 | fatal("%.200s line %d: Bad yes/no/ask argument.", filename, linenum); | |
430 | if (*activep && *intptr == -1) | |
431 | *intptr = value; | |
432 | break; | |
433 | ||
434 | case oCompression: | |
435 | intptr = &options->compression; | |
436 | goto parse_flag; | |
437 | ||
438 | case oKeepAlives: | |
439 | intptr = &options->keepalives; | |
440 | goto parse_flag; | |
441 | ||
442 | case oNoHostAuthenticationForLocalhost: | |
443 | intptr = &options->no_host_authentication_for_localhost; | |
444 | goto parse_flag; | |
445 | ||
446 | case oNumberOfPasswordPrompts: | |
447 | intptr = &options->number_of_password_prompts; | |
448 | goto parse_int; | |
449 | ||
450 | case oCompressionLevel: | |
451 | intptr = &options->compression_level; | |
452 | goto parse_int; | |
453 | ||
454 | case oIdentityFile: | |
455 | arg = strdelim(&s); | |
456 | if (!arg || *arg == '\0') | |
457 | fatal("%.200s line %d: Missing argument.", filename, linenum); | |
458 | if (*activep) { | |
459 | intptr = &options->num_identity_files; | |
460 | if (*intptr >= SSH_MAX_IDENTITY_FILES) | |
461 | fatal("%.200s line %d: Too many identity files specified (max %d).", | |
e9702f7d | 462 | filename, linenum, SSH_MAX_IDENTITY_FILES); |
3c0ef626 | 463 | charptr = &options->identity_files[*intptr]; |
464 | *charptr = xstrdup(arg); | |
465 | *intptr = *intptr + 1; | |
466 | } | |
467 | break; | |
468 | ||
469 | case oXAuthLocation: | |
470 | charptr=&options->xauth_location; | |
471 | goto parse_string; | |
472 | ||
473 | case oUser: | |
474 | charptr = &options->user; | |
475 | parse_string: | |
476 | arg = strdelim(&s); | |
477 | if (!arg || *arg == '\0') | |
478 | fatal("%.200s line %d: Missing argument.", filename, linenum); | |
479 | if (*activep && *charptr == NULL) | |
480 | *charptr = xstrdup(arg); | |
481 | break; | |
482 | ||
483 | case oGlobalKnownHostsFile: | |
484 | charptr = &options->system_hostfile; | |
485 | goto parse_string; | |
486 | ||
487 | case oUserKnownHostsFile: | |
488 | charptr = &options->user_hostfile; | |
489 | goto parse_string; | |
490 | ||
491 | case oGlobalKnownHostsFile2: | |
492 | charptr = &options->system_hostfile2; | |
493 | goto parse_string; | |
494 | ||
495 | case oUserKnownHostsFile2: | |
496 | charptr = &options->user_hostfile2; | |
497 | goto parse_string; | |
498 | ||
499 | case oHostName: | |
500 | charptr = &options->hostname; | |
501 | goto parse_string; | |
502 | ||
503 | case oHostKeyAlias: | |
504 | charptr = &options->host_key_alias; | |
505 | goto parse_string; | |
506 | ||
507 | case oPreferredAuthentications: | |
508 | charptr = &options->preferred_authentications; | |
509 | goto parse_string; | |
510 | ||
511 | case oBindAddress: | |
512 | charptr = &options->bind_address; | |
513 | goto parse_string; | |
514 | ||
515 | case oSmartcardDevice: | |
516 | charptr = &options->smartcard_device; | |
517 | goto parse_string; | |
518 | ||
519 | case oProxyCommand: | |
520 | charptr = &options->proxy_command; | |
521 | string = xstrdup(""); | |
522 | while ((arg = strdelim(&s)) != NULL && *arg != '\0') { | |
523 | string = xrealloc(string, strlen(string) + strlen(arg) + 2); | |
524 | strcat(string, " "); | |
525 | strcat(string, arg); | |
526 | } | |
527 | if (*activep && *charptr == NULL) | |
528 | *charptr = string; | |
529 | else | |
530 | xfree(string); | |
531 | return 0; | |
532 | ||
533 | case oPort: | |
534 | intptr = &options->port; | |
535 | parse_int: | |
536 | arg = strdelim(&s); | |
537 | if (!arg || *arg == '\0') | |
538 | fatal("%.200s line %d: Missing argument.", filename, linenum); | |
539 | if (arg[0] < '0' || arg[0] > '9') | |
540 | fatal("%.200s line %d: Bad number.", filename, linenum); | |
541 | ||
542 | /* Octal, decimal, or hex format? */ | |
543 | value = strtol(arg, &endofnumber, 0); | |
544 | if (arg == endofnumber) | |
545 | fatal("%.200s line %d: Bad number.", filename, linenum); | |
546 | if (*activep && *intptr == -1) | |
547 | *intptr = value; | |
548 | break; | |
549 | ||
550 | case oConnectionAttempts: | |
551 | intptr = &options->connection_attempts; | |
552 | goto parse_int; | |
553 | ||
554 | case oCipher: | |
555 | intptr = &options->cipher; | |
556 | arg = strdelim(&s); | |
557 | if (!arg || *arg == '\0') | |
558 | fatal("%.200s line %d: Missing argument.", filename, linenum); | |
559 | value = cipher_number(arg); | |
560 | if (value == -1) | |
561 | fatal("%.200s line %d: Bad cipher '%s'.", | |
e9702f7d | 562 | filename, linenum, arg ? arg : "<NONE>"); |
3c0ef626 | 563 | if (*activep && *intptr == -1) |
564 | *intptr = value; | |
565 | break; | |
566 | ||
567 | case oCiphers: | |
568 | arg = strdelim(&s); | |
569 | if (!arg || *arg == '\0') | |
570 | fatal("%.200s line %d: Missing argument.", filename, linenum); | |
571 | if (!ciphers_valid(arg)) | |
572 | fatal("%.200s line %d: Bad SSH2 cipher spec '%s'.", | |
e9702f7d | 573 | filename, linenum, arg ? arg : "<NONE>"); |
3c0ef626 | 574 | if (*activep && options->ciphers == NULL) |
575 | options->ciphers = xstrdup(arg); | |
576 | break; | |
577 | ||
578 | case oMacs: | |
579 | arg = strdelim(&s); | |
580 | if (!arg || *arg == '\0') | |
581 | fatal("%.200s line %d: Missing argument.", filename, linenum); | |
582 | if (!mac_valid(arg)) | |
583 | fatal("%.200s line %d: Bad SSH2 Mac spec '%s'.", | |
e9702f7d | 584 | filename, linenum, arg ? arg : "<NONE>"); |
3c0ef626 | 585 | if (*activep && options->macs == NULL) |
586 | options->macs = xstrdup(arg); | |
587 | break; | |
588 | ||
589 | case oHostKeyAlgorithms: | |
590 | arg = strdelim(&s); | |
591 | if (!arg || *arg == '\0') | |
592 | fatal("%.200s line %d: Missing argument.", filename, linenum); | |
593 | if (!key_names_valid2(arg)) | |
594 | fatal("%.200s line %d: Bad protocol 2 host key algorithms '%s'.", | |
e9702f7d | 595 | filename, linenum, arg ? arg : "<NONE>"); |
3c0ef626 | 596 | if (*activep && options->hostkeyalgorithms == NULL) |
597 | options->hostkeyalgorithms = xstrdup(arg); | |
598 | break; | |
599 | ||
600 | case oProtocol: | |
601 | intptr = &options->protocol; | |
602 | arg = strdelim(&s); | |
603 | if (!arg || *arg == '\0') | |
604 | fatal("%.200s line %d: Missing argument.", filename, linenum); | |
605 | value = proto_spec(arg); | |
606 | if (value == SSH_PROTO_UNKNOWN) | |
607 | fatal("%.200s line %d: Bad protocol spec '%s'.", | |
e9702f7d | 608 | filename, linenum, arg ? arg : "<NONE>"); |
3c0ef626 | 609 | if (*activep && *intptr == SSH_PROTO_UNKNOWN) |
610 | *intptr = value; | |
611 | break; | |
612 | ||
613 | case oLogLevel: | |
614 | intptr = (int *) &options->log_level; | |
615 | arg = strdelim(&s); | |
616 | value = log_level_number(arg); | |
e9702f7d | 617 | if (value == SYSLOG_LEVEL_NOT_SET) |
3c0ef626 | 618 | fatal("%.200s line %d: unsupported log level '%s'", |
e9702f7d | 619 | filename, linenum, arg ? arg : "<NONE>"); |
620 | if (*activep && (LogLevel) *intptr == SYSLOG_LEVEL_NOT_SET) | |
3c0ef626 | 621 | *intptr = (LogLevel) value; |
622 | break; | |
623 | ||
624 | case oLocalForward: | |
625 | case oRemoteForward: | |
626 | arg = strdelim(&s); | |
627 | if (!arg || *arg == '\0') | |
628 | fatal("%.200s line %d: Missing port argument.", | |
629 | filename, linenum); | |
630 | if ((fwd_port = a2port(arg)) == 0) | |
631 | fatal("%.200s line %d: Bad listen port.", | |
632 | filename, linenum); | |
633 | arg = strdelim(&s); | |
634 | if (!arg || *arg == '\0') | |
635 | fatal("%.200s line %d: Missing second argument.", | |
636 | filename, linenum); | |
637 | if (sscanf(arg, "%255[^:]:%5[0-9]", buf, sfwd_host_port) != 2 && | |
638 | sscanf(arg, "%255[^/]/%5[0-9]", buf, sfwd_host_port) != 2) | |
639 | fatal("%.200s line %d: Bad forwarding specification.", | |
640 | filename, linenum); | |
641 | if ((fwd_host_port = a2port(sfwd_host_port)) == 0) | |
642 | fatal("%.200s line %d: Bad forwarding port.", | |
643 | filename, linenum); | |
644 | if (*activep) { | |
645 | if (opcode == oLocalForward) | |
646 | add_local_forward(options, fwd_port, buf, | |
647 | fwd_host_port); | |
648 | else if (opcode == oRemoteForward) | |
649 | add_remote_forward(options, fwd_port, buf, | |
650 | fwd_host_port); | |
651 | } | |
652 | break; | |
653 | ||
654 | case oDynamicForward: | |
655 | arg = strdelim(&s); | |
656 | if (!arg || *arg == '\0') | |
657 | fatal("%.200s line %d: Missing port argument.", | |
658 | filename, linenum); | |
659 | fwd_port = a2port(arg); | |
660 | if (fwd_port == 0) | |
661 | fatal("%.200s line %d: Badly formatted port number.", | |
662 | filename, linenum); | |
663 | if (*activep) | |
664 | add_local_forward(options, fwd_port, "socks4", 0); | |
665 | break; | |
666 | ||
667 | case oClearAllForwardings: | |
668 | intptr = &options->clear_forwardings; | |
669 | goto parse_flag; | |
670 | ||
671 | case oHost: | |
672 | *activep = 0; | |
673 | while ((arg = strdelim(&s)) != NULL && *arg != '\0') | |
674 | if (match_pattern(host, arg)) { | |
675 | debug("Applying options for %.100s", arg); | |
676 | *activep = 1; | |
677 | break; | |
678 | } | |
679 | /* Avoid garbage check below, as strdelim is done. */ | |
680 | return 0; | |
681 | ||
682 | case oEscapeChar: | |
683 | intptr = &options->escape_char; | |
684 | arg = strdelim(&s); | |
685 | if (!arg || *arg == '\0') | |
686 | fatal("%.200s line %d: Missing argument.", filename, linenum); | |
687 | if (arg[0] == '^' && arg[2] == 0 && | |
688 | (u_char) arg[1] >= 64 && (u_char) arg[1] < 128) | |
689 | value = (u_char) arg[1] & 31; | |
690 | else if (strlen(arg) == 1) | |
691 | value = (u_char) arg[0]; | |
692 | else if (strcmp(arg, "none") == 0) | |
693 | value = SSH_ESCAPECHAR_NONE; | |
694 | else { | |
695 | fatal("%.200s line %d: Bad escape character.", | |
e9702f7d | 696 | filename, linenum); |
3c0ef626 | 697 | /* NOTREACHED */ |
698 | value = 0; /* Avoid compiler warning. */ | |
699 | } | |
700 | if (*activep && *intptr == -1) | |
701 | *intptr = value; | |
702 | break; | |
703 | ||
44a053a3 | 704 | case oDeprecated: |
705 | debug("%s line %d: Deprecated option \"%s\"", | |
706 | filename, linenum, keyword); | |
707 | return 0; | |
708 | ||
3c0ef626 | 709 | default: |
710 | fatal("process_config_line: Unimplemented opcode %d", opcode); | |
711 | } | |
712 | ||
713 | /* Check that there is no garbage at end of line. */ | |
714 | if ((arg = strdelim(&s)) != NULL && *arg != '\0') { | |
715 | fatal("%.200s line %d: garbage at end of line; \"%.200s\".", | |
e9702f7d | 716 | filename, linenum, arg); |
3c0ef626 | 717 | } |
718 | return 0; | |
719 | } | |
720 | ||
721 | ||
722 | /* | |
723 | * Reads the config file and modifies the options accordingly. Options | |
724 | * should already be initialized before this call. This never returns if | |
725 | * there is an error. If the file does not exist, this returns 0. | |
726 | */ | |
727 | ||
728 | int | |
729 | read_config_file(const char *filename, const char *host, Options *options) | |
730 | { | |
731 | FILE *f; | |
732 | char line[1024]; | |
733 | int active, linenum; | |
734 | int bad_options = 0; | |
735 | ||
736 | /* Open the file. */ | |
737 | f = fopen(filename, "r"); | |
738 | if (!f) | |
739 | return 0; | |
740 | ||
741 | debug("Reading configuration data %.200s", filename); | |
742 | ||
743 | /* | |
744 | * Mark that we are now processing the options. This flag is turned | |
745 | * on/off by Host specifications. | |
746 | */ | |
747 | active = 1; | |
748 | linenum = 0; | |
749 | while (fgets(line, sizeof(line), f)) { | |
750 | /* Update line number counter. */ | |
751 | linenum++; | |
752 | if (process_config_line(options, host, line, filename, linenum, &active) != 0) | |
753 | bad_options++; | |
754 | } | |
755 | fclose(f); | |
756 | if (bad_options > 0) | |
757 | fatal("%s: terminating, %d bad configuration options", | |
e9702f7d | 758 | filename, bad_options); |
3c0ef626 | 759 | return 1; |
760 | } | |
761 | ||
762 | /* | |
763 | * Initializes options to special values that indicate that they have not yet | |
764 | * been set. Read_config_file will only set options with this value. Options | |
765 | * are processed in the following order: command line, user config file, | |
766 | * system config file. Last, fill_default_options is called. | |
767 | */ | |
768 | ||
769 | void | |
770 | initialize_options(Options * options) | |
771 | { | |
772 | memset(options, 'X', sizeof(*options)); | |
773 | options->forward_agent = -1; | |
774 | options->forward_x11 = -1; | |
775 | options->xauth_location = NULL; | |
776 | options->gateway_ports = -1; | |
777 | options->use_privileged_port = -1; | |
778 | options->rhosts_authentication = -1; | |
779 | options->rsa_authentication = -1; | |
780 | options->pubkey_authentication = -1; | |
781 | options->challenge_response_authentication = -1; | |
5598e598 | 782 | #ifdef GSSAPI |
783 | options->gss_authentication = -1; | |
784 | options->gss_deleg_creds = -1; | |
785 | #ifdef GSI | |
786 | options->gss_globus_deleg_limited_proxy = -1; | |
787 | #endif /* GSI */ | |
788 | #endif /* GSSAPI */ | |
789 | ||
3c0ef626 | 790 | #if defined(KRB4) || defined(KRB5) |
791 | options->kerberos_authentication = -1; | |
792 | #endif | |
793 | #if defined(AFS) || defined(KRB5) | |
794 | options->kerberos_tgt_passing = -1; | |
795 | #endif | |
796 | #ifdef AFS | |
797 | options->afs_token_passing = -1; | |
798 | #endif | |
799 | options->password_authentication = -1; | |
800 | options->kbd_interactive_authentication = -1; | |
801 | options->kbd_interactive_devices = NULL; | |
802 | options->rhosts_rsa_authentication = -1; | |
803 | options->hostbased_authentication = -1; | |
3c0ef626 | 804 | options->batch_mode = -1; |
805 | options->check_host_ip = -1; | |
806 | options->strict_host_key_checking = -1; | |
807 | options->compression = -1; | |
808 | options->keepalives = -1; | |
809 | options->compression_level = -1; | |
810 | options->port = -1; | |
811 | options->connection_attempts = -1; | |
812 | options->number_of_password_prompts = -1; | |
813 | options->cipher = -1; | |
814 | options->ciphers = NULL; | |
815 | options->macs = NULL; | |
816 | options->hostkeyalgorithms = NULL; | |
817 | options->protocol = SSH_PROTO_UNKNOWN; | |
818 | options->num_identity_files = 0; | |
819 | options->hostname = NULL; | |
820 | options->host_key_alias = NULL; | |
821 | options->proxy_command = NULL; | |
822 | options->user = NULL; | |
823 | options->escape_char = -1; | |
824 | options->system_hostfile = NULL; | |
825 | options->user_hostfile = NULL; | |
826 | options->system_hostfile2 = NULL; | |
827 | options->user_hostfile2 = NULL; | |
828 | options->num_local_forwards = 0; | |
829 | options->num_remote_forwards = 0; | |
830 | options->clear_forwardings = -1; | |
e9702f7d | 831 | options->log_level = SYSLOG_LEVEL_NOT_SET; |
3c0ef626 | 832 | options->preferred_authentications = NULL; |
833 | options->bind_address = NULL; | |
834 | options->smartcard_device = NULL; | |
835 | options->no_host_authentication_for_localhost = - 1; | |
836 | } | |
837 | ||
838 | /* | |
839 | * Called after processing other sources of option data, this fills those | |
840 | * options for which no value has been specified with their default values. | |
841 | */ | |
842 | ||
843 | void | |
844 | fill_default_options(Options * options) | |
845 | { | |
846 | int len; | |
847 | ||
848 | if (options->forward_agent == -1) | |
849 | options->forward_agent = 0; | |
850 | if (options->forward_x11 == -1) | |
851 | options->forward_x11 = 0; | |
3c0ef626 | 852 | if (options->xauth_location == NULL) |
853 | options->xauth_location = _PATH_XAUTH; | |
3c0ef626 | 854 | if (options->gateway_ports == -1) |
855 | options->gateway_ports = 0; | |
856 | if (options->use_privileged_port == -1) | |
857 | options->use_privileged_port = 0; | |
858 | if (options->rhosts_authentication == -1) | |
44a053a3 | 859 | options->rhosts_authentication = 0; |
3c0ef626 | 860 | if (options->rsa_authentication == -1) |
861 | options->rsa_authentication = 1; | |
862 | if (options->pubkey_authentication == -1) | |
863 | options->pubkey_authentication = 1; | |
864 | if (options->challenge_response_authentication == -1) | |
865 | options->challenge_response_authentication = 1; | |
5598e598 | 866 | #ifdef GSSAPI |
867 | if (options->gss_authentication == -1) | |
868 | options->gss_authentication = 1; | |
869 | if (options->gss_deleg_creds == -1) | |
870 | options->gss_deleg_creds = 1; | |
871 | #ifdef GSI | |
872 | if (options->gss_globus_deleg_limited_proxy == -1) | |
873 | options->gss_globus_deleg_limited_proxy = 0; | |
874 | #endif /* GSI */ | |
875 | #endif /* GSSAPI */ | |
3c0ef626 | 876 | #if defined(KRB4) || defined(KRB5) |
877 | if (options->kerberos_authentication == -1) | |
878 | options->kerberos_authentication = 1; | |
879 | #endif | |
880 | #if defined(AFS) || defined(KRB5) | |
881 | if (options->kerberos_tgt_passing == -1) | |
882 | options->kerberos_tgt_passing = 1; | |
883 | #endif | |
884 | #ifdef AFS | |
885 | if (options->afs_token_passing == -1) | |
886 | options->afs_token_passing = 1; | |
887 | #endif | |
888 | if (options->password_authentication == -1) | |
889 | options->password_authentication = 1; | |
890 | if (options->kbd_interactive_authentication == -1) | |
891 | options->kbd_interactive_authentication = 1; | |
892 | if (options->rhosts_rsa_authentication == -1) | |
44a053a3 | 893 | options->rhosts_rsa_authentication = 0; |
3c0ef626 | 894 | if (options->hostbased_authentication == -1) |
895 | options->hostbased_authentication = 0; | |
3c0ef626 | 896 | if (options->batch_mode == -1) |
897 | options->batch_mode = 0; | |
898 | if (options->check_host_ip == -1) | |
899 | options->check_host_ip = 1; | |
900 | if (options->strict_host_key_checking == -1) | |
901 | options->strict_host_key_checking = 2; /* 2 is default */ | |
902 | if (options->compression == -1) | |
903 | options->compression = 0; | |
904 | if (options->keepalives == -1) | |
905 | options->keepalives = 1; | |
906 | if (options->compression_level == -1) | |
907 | options->compression_level = 6; | |
908 | if (options->port == -1) | |
909 | options->port = 0; /* Filled in ssh_connect. */ | |
910 | if (options->connection_attempts == -1) | |
911 | options->connection_attempts = 1; | |
912 | if (options->number_of_password_prompts == -1) | |
913 | options->number_of_password_prompts = 3; | |
914 | /* Selected in ssh_login(). */ | |
915 | if (options->cipher == -1) | |
916 | options->cipher = SSH_CIPHER_NOT_SET; | |
917 | /* options->ciphers, default set in myproposals.h */ | |
918 | /* options->macs, default set in myproposals.h */ | |
919 | /* options->hostkeyalgorithms, default set in myproposals.h */ | |
920 | if (options->protocol == SSH_PROTO_UNKNOWN) | |
921 | options->protocol = SSH_PROTO_1|SSH_PROTO_2; | |
922 | if (options->num_identity_files == 0) { | |
923 | if (options->protocol & SSH_PROTO_1) { | |
924 | len = 2 + strlen(_PATH_SSH_CLIENT_IDENTITY) + 1; | |
925 | options->identity_files[options->num_identity_files] = | |
926 | xmalloc(len); | |
927 | snprintf(options->identity_files[options->num_identity_files++], | |
928 | len, "~/%.100s", _PATH_SSH_CLIENT_IDENTITY); | |
929 | } | |
930 | if (options->protocol & SSH_PROTO_2) { | |
931 | len = 2 + strlen(_PATH_SSH_CLIENT_ID_RSA) + 1; | |
932 | options->identity_files[options->num_identity_files] = | |
933 | xmalloc(len); | |
934 | snprintf(options->identity_files[options->num_identity_files++], | |
935 | len, "~/%.100s", _PATH_SSH_CLIENT_ID_RSA); | |
936 | ||
937 | len = 2 + strlen(_PATH_SSH_CLIENT_ID_DSA) + 1; | |
938 | options->identity_files[options->num_identity_files] = | |
939 | xmalloc(len); | |
940 | snprintf(options->identity_files[options->num_identity_files++], | |
941 | len, "~/%.100s", _PATH_SSH_CLIENT_ID_DSA); | |
942 | } | |
943 | } | |
944 | if (options->escape_char == -1) | |
945 | options->escape_char = '~'; | |
946 | if (options->system_hostfile == NULL) | |
947 | options->system_hostfile = _PATH_SSH_SYSTEM_HOSTFILE; | |
948 | if (options->user_hostfile == NULL) | |
949 | options->user_hostfile = _PATH_SSH_USER_HOSTFILE; | |
950 | if (options->system_hostfile2 == NULL) | |
951 | options->system_hostfile2 = _PATH_SSH_SYSTEM_HOSTFILE2; | |
952 | if (options->user_hostfile2 == NULL) | |
953 | options->user_hostfile2 = _PATH_SSH_USER_HOSTFILE2; | |
e9702f7d | 954 | if (options->log_level == SYSLOG_LEVEL_NOT_SET) |
3c0ef626 | 955 | options->log_level = SYSLOG_LEVEL_INFO; |
956 | if (options->clear_forwardings == 1) | |
957 | clear_forwardings(options); | |
958 | if (options->no_host_authentication_for_localhost == - 1) | |
959 | options->no_host_authentication_for_localhost = 0; | |
960 | /* options->proxy_command should not be set by default */ | |
961 | /* options->user will be set in the main program if appropriate */ | |
962 | /* options->hostname will be set in the main program if appropriate */ | |
963 | /* options->host_key_alias should not be set by default */ | |
964 | /* options->preferred_authentications will be set in ssh */ | |
965 | } |