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Commit | Line | Data |
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8efc0c15 | 1 | /* |
2 | ||
3 | readconf.c | |
4 | ||
5 | Author: Tatu Ylonen <ylo@cs.hut.fi> | |
6 | ||
7 | Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland | |
8 | All rights reserved | |
9 | ||
10 | Created: Sat Apr 22 00:03:10 1995 ylo | |
11 | ||
12 | Functions for reading the configuration files. | |
13 | ||
14 | */ | |
15 | ||
16 | #include "includes.h" | |
17 | RCSID("$Id$"); | |
18 | ||
19 | #include "ssh.h" | |
20 | #include "cipher.h" | |
21 | #include "readconf.h" | |
22 | #include "xmalloc.h" | |
23 | ||
24 | /* Format of the configuration file: | |
25 | ||
26 | # Configuration data is parsed as follows: | |
27 | # 1. command line options | |
28 | # 2. user-specific file | |
29 | # 3. system-wide file | |
30 | # Any configuration value is only changed the first time it is set. | |
31 | # Thus, host-specific definitions should be at the beginning of the | |
32 | # configuration file, and defaults at the end. | |
33 | ||
34 | # Host-specific declarations. These may override anything above. A single | |
35 | # host may match multiple declarations; these are processed in the order | |
36 | # that they are given in. | |
37 | ||
38 | Host *.ngs.fi ngs.fi | |
39 | FallBackToRsh no | |
40 | ||
41 | Host fake.com | |
42 | HostName another.host.name.real.org | |
43 | User blaah | |
44 | Port 34289 | |
45 | ForwardX11 no | |
46 | ForwardAgent no | |
47 | ||
48 | Host books.com | |
49 | RemoteForward 9999 shadows.cs.hut.fi:9999 | |
50 | Cipher 3des | |
51 | ||
52 | Host fascist.blob.com | |
53 | Port 23123 | |
54 | User tylonen | |
55 | RhostsAuthentication no | |
56 | PasswordAuthentication no | |
57 | ||
58 | Host puukko.hut.fi | |
59 | User t35124p | |
60 | ProxyCommand ssh-proxy %h %p | |
61 | ||
62 | Host *.fr | |
63 | UseRsh yes | |
64 | ||
65 | Host *.su | |
66 | Cipher none | |
67 | PasswordAuthentication no | |
68 | ||
69 | # Defaults for various options | |
70 | Host * | |
71 | ForwardAgent no | |
72 | ForwardX11 yes | |
73 | RhostsAuthentication yes | |
74 | PasswordAuthentication yes | |
75 | RSAAuthentication yes | |
76 | RhostsRSAAuthentication yes | |
77 | FallBackToRsh no | |
78 | UseRsh no | |
79 | StrictHostKeyChecking yes | |
80 | KeepAlives no | |
81 | IdentityFile ~/.ssh/identity | |
82 | Port 22 | |
83 | EscapeChar ~ | |
84 | ||
85 | */ | |
86 | ||
87 | /* Keyword tokens. */ | |
88 | ||
89 | typedef enum | |
90 | { | |
e7c0f9d5 | 91 | oBadOption, |
8efc0c15 | 92 | oForwardAgent, oForwardX11, oGatewayPorts, oRhostsAuthentication, |
93 | oPasswordAuthentication, oRSAAuthentication, oFallBackToRsh, oUseRsh, | |
94 | #ifdef KRB4 | |
95 | oKerberosAuthentication, | |
96 | #endif /* KRB4 */ | |
97 | #ifdef AFS | |
98 | oKerberosTgtPassing, oAFSTokenPassing, | |
99 | #endif | |
100 | oIdentityFile, oHostName, oPort, oCipher, oRemoteForward, oLocalForward, | |
101 | oUser, oHost, oEscapeChar, oRhostsRSAAuthentication, oProxyCommand, | |
102 | oGlobalKnownHostsFile, oUserKnownHostsFile, oConnectionAttempts, | |
103 | oBatchMode, oCheckHostIP, oStrictHostKeyChecking, oCompression, | |
104 | oCompressionLevel, oKeepAlives, oNumberOfPasswordPrompts, oTISAuthentication, | |
6a17f9c2 | 105 | oUsePrivilegedPort, oLogLevel |
8efc0c15 | 106 | } OpCodes; |
107 | ||
108 | /* Textual representations of the tokens. */ | |
109 | ||
110 | static struct | |
111 | { | |
112 | const char *name; | |
113 | OpCodes opcode; | |
114 | } keywords[] = | |
115 | { | |
116 | { "forwardagent", oForwardAgent }, | |
117 | { "forwardx11", oForwardX11 }, | |
118 | { "gatewayports", oGatewayPorts }, | |
119 | { "useprivilegedport", oUsePrivilegedPort }, | |
120 | { "rhostsauthentication", oRhostsAuthentication }, | |
121 | { "passwordauthentication", oPasswordAuthentication }, | |
122 | { "rsaauthentication", oRSAAuthentication }, | |
123 | #ifdef KRB4 | |
124 | { "kerberosauthentication", oKerberosAuthentication }, | |
125 | #endif /* KRB4 */ | |
126 | #ifdef AFS | |
127 | { "kerberostgtpassing", oKerberosTgtPassing }, | |
128 | { "afstokenpassing", oAFSTokenPassing }, | |
129 | #endif | |
130 | { "fallbacktorsh", oFallBackToRsh }, | |
131 | { "usersh", oUseRsh }, | |
132 | { "identityfile", oIdentityFile }, | |
133 | { "hostname", oHostName }, | |
134 | { "proxycommand", oProxyCommand }, | |
135 | { "port", oPort }, | |
136 | { "cipher", oCipher }, | |
137 | { "remoteforward", oRemoteForward }, | |
138 | { "localforward", oLocalForward }, | |
139 | { "user", oUser }, | |
140 | { "host", oHost }, | |
141 | { "escapechar", oEscapeChar }, | |
142 | { "rhostsrsaauthentication", oRhostsRSAAuthentication }, | |
143 | { "globalknownhostsfile", oGlobalKnownHostsFile }, | |
144 | { "userknownhostsfile", oUserKnownHostsFile }, | |
145 | { "connectionattempts", oConnectionAttempts }, | |
146 | { "batchmode", oBatchMode }, | |
147 | { "checkhostip", oCheckHostIP }, | |
148 | { "stricthostkeychecking", oStrictHostKeyChecking }, | |
149 | { "compression", oCompression }, | |
150 | { "compressionlevel", oCompressionLevel }, | |
151 | { "keepalive", oKeepAlives }, | |
152 | { "numberofpasswordprompts", oNumberOfPasswordPrompts }, | |
153 | { "tisauthentication", oTISAuthentication }, | |
6a17f9c2 | 154 | { "loglevel", oLogLevel }, |
155 | { NULL, 0 } | |
156 | }; | |
157 | ||
158 | /* textual representation of log-levels */ | |
159 | ||
160 | static struct | |
161 | { | |
162 | const char *name; | |
163 | LogLevel level; | |
164 | } log_levels[] = | |
165 | { | |
166 | { "QUIET", SYSLOG_LEVEL_QUIET }, | |
167 | { "FATAL", SYSLOG_LEVEL_FATAL }, | |
168 | { "ERROR", SYSLOG_LEVEL_ERROR }, | |
169 | { "INFO", SYSLOG_LEVEL_INFO }, | |
170 | { "CHAT", SYSLOG_LEVEL_CHAT }, | |
171 | { "DEBUG", SYSLOG_LEVEL_DEBUG }, | |
8efc0c15 | 172 | { NULL, 0 } |
173 | }; | |
174 | ||
175 | /* Characters considered whitespace in strtok calls. */ | |
176 | #define WHITESPACE " \t\r\n" | |
177 | ||
178 | ||
179 | /* Adds a local TCP/IP port forward to options. Never returns if there | |
180 | is an error. */ | |
181 | ||
182 | void add_local_forward(Options *options, int port, const char *host, | |
183 | int host_port) | |
184 | { | |
185 | Forward *fwd; | |
186 | extern uid_t original_real_uid; | |
187 | if ((port & 0xffff) != port) | |
188 | fatal("Requested forwarding of nonexistent port %d.", port); | |
189 | if (port < IPPORT_RESERVED && original_real_uid != 0) | |
190 | fatal("Privileged ports can only be forwarded by root.\n"); | |
191 | if (options->num_local_forwards >= SSH_MAX_FORWARDS_PER_DIRECTION) | |
192 | fatal("Too many local forwards (max %d).", SSH_MAX_FORWARDS_PER_DIRECTION); | |
193 | fwd = &options->local_forwards[options->num_local_forwards++]; | |
194 | fwd->port = port; | |
195 | fwd->host = xstrdup(host); | |
196 | fwd->host_port = host_port; | |
197 | } | |
198 | ||
199 | /* Adds a remote TCP/IP port forward to options. Never returns if there | |
200 | is an error. */ | |
201 | ||
202 | void add_remote_forward(Options *options, int port, const char *host, | |
203 | int host_port) | |
204 | { | |
205 | Forward *fwd; | |
206 | if (options->num_remote_forwards >= SSH_MAX_FORWARDS_PER_DIRECTION) | |
207 | fatal("Too many remote forwards (max %d).", | |
208 | SSH_MAX_FORWARDS_PER_DIRECTION); | |
209 | fwd = &options->remote_forwards[options->num_remote_forwards++]; | |
210 | fwd->port = port; | |
211 | fwd->host = xstrdup(host); | |
212 | fwd->host_port = host_port; | |
213 | } | |
214 | ||
215 | /* Returns the number of the token pointed to by cp of length len. | |
216 | Never returns if the token is not known. */ | |
217 | ||
218 | static OpCodes parse_token(const char *cp, const char *filename, int linenum) | |
219 | { | |
220 | unsigned int i; | |
221 | ||
222 | for (i = 0; keywords[i].name; i++) | |
223 | if (strcmp(cp, keywords[i].name) == 0) | |
224 | return keywords[i].opcode; | |
225 | ||
e7c0f9d5 | 226 | fprintf(stderr, "%s: line %d: Bad configuration option: %s\n", |
227 | filename, linenum, cp); | |
228 | return oBadOption; | |
8efc0c15 | 229 | } |
230 | ||
231 | /* Processes a single option line as used in the configuration files. | |
232 | This only sets those values that have not already been set. */ | |
233 | ||
e7c0f9d5 | 234 | int |
235 | process_config_line(Options *options, const char *host, | |
8efc0c15 | 236 | char *line, const char *filename, int linenum, |
237 | int *activep) | |
238 | { | |
239 | char buf[256], *cp, *string, **charptr; | |
6a17f9c2 | 240 | int opcode, *intptr, value, fwd_port, fwd_host_port, i; |
8efc0c15 | 241 | |
242 | /* Skip leading whitespace. */ | |
243 | cp = line + strspn(line, WHITESPACE); | |
244 | if (!*cp || *cp == '\n' || *cp == '#') | |
e7c0f9d5 | 245 | return 0; |
8efc0c15 | 246 | |
247 | /* Get the keyword. (Each line is supposed to begin with a keyword). */ | |
248 | cp = strtok(cp, WHITESPACE); | |
249 | { | |
250 | char *t = cp; | |
251 | for (; *t != 0; t++) | |
252 | if ('A' <= *t && *t <= 'Z') | |
253 | *t = *t - 'A' + 'a'; /* tolower */ | |
254 | ||
255 | } | |
256 | opcode = parse_token(cp, filename, linenum); | |
257 | ||
258 | switch (opcode) | |
259 | { | |
e7c0f9d5 | 260 | case oBadOption: |
261 | return -1; /* don't panic, but count bad options */ | |
262 | /*NOTREACHED*/ | |
8efc0c15 | 263 | case oForwardAgent: |
264 | intptr = &options->forward_agent; | |
265 | parse_flag: | |
266 | cp = strtok(NULL, WHITESPACE); | |
267 | if (!cp) | |
268 | fatal("%.200s line %d: Missing yes/no argument.", filename, linenum); | |
269 | value = 0; /* To avoid compiler warning... */ | |
270 | if (strcmp(cp, "yes") == 0 || strcmp(cp, "true") == 0) | |
271 | value = 1; | |
272 | else if (strcmp(cp, "no") == 0 || strcmp(cp, "false") == 0) | |
273 | value = 0; | |
274 | else | |
275 | fatal("%.200s line %d: Bad yes/no argument.", filename, linenum); | |
276 | if (*activep && *intptr == -1) | |
277 | *intptr = value; | |
278 | break; | |
279 | ||
280 | case oForwardX11: | |
281 | intptr = &options->forward_x11; | |
282 | goto parse_flag; | |
283 | ||
284 | case oGatewayPorts: | |
285 | intptr = &options->gateway_ports; | |
286 | goto parse_flag; | |
287 | ||
288 | case oUsePrivilegedPort: | |
289 | intptr = &options->use_privileged_port; | |
290 | goto parse_flag; | |
291 | ||
292 | case oRhostsAuthentication: | |
293 | intptr = &options->rhosts_authentication; | |
294 | goto parse_flag; | |
295 | ||
296 | case oPasswordAuthentication: | |
297 | intptr = &options->password_authentication; | |
298 | goto parse_flag; | |
299 | ||
300 | case oRSAAuthentication: | |
301 | intptr = &options->rsa_authentication; | |
302 | goto parse_flag; | |
303 | ||
304 | case oRhostsRSAAuthentication: | |
305 | intptr = &options->rhosts_rsa_authentication; | |
306 | goto parse_flag; | |
307 | ||
308 | #ifdef KRB4 | |
309 | case oKerberosAuthentication: | |
310 | intptr = &options->kerberos_authentication; | |
311 | goto parse_flag; | |
312 | #endif /* KRB4 */ | |
313 | ||
314 | #ifdef AFS | |
315 | case oKerberosTgtPassing: | |
316 | intptr = &options->kerberos_tgt_passing; | |
317 | goto parse_flag; | |
318 | ||
319 | case oAFSTokenPassing: | |
320 | intptr = &options->afs_token_passing; | |
321 | goto parse_flag; | |
322 | #endif | |
323 | ||
324 | case oFallBackToRsh: | |
325 | intptr = &options->fallback_to_rsh; | |
326 | goto parse_flag; | |
327 | ||
328 | case oUseRsh: | |
329 | intptr = &options->use_rsh; | |
330 | goto parse_flag; | |
331 | ||
332 | case oBatchMode: | |
333 | intptr = &options->batch_mode; | |
334 | goto parse_flag; | |
335 | ||
336 | case oCheckHostIP: | |
337 | intptr = &options->check_host_ip; | |
338 | goto parse_flag; | |
339 | ||
340 | case oStrictHostKeyChecking: | |
341 | intptr = &options->strict_host_key_checking; | |
342 | cp = strtok(NULL, WHITESPACE); | |
343 | if (!cp) | |
344 | fatal("%.200s line %d: Missing yes/no argument.", | |
345 | filename, linenum); | |
346 | value = 0; /* To avoid compiler warning... */ | |
347 | if (strcmp(cp, "yes") == 0 || strcmp(cp, "true") == 0) | |
348 | value = 1; | |
349 | else if (strcmp(cp, "no") == 0 || strcmp(cp, "false") == 0) | |
350 | value = 0; | |
351 | else if (strcmp(cp, "ask") == 0) | |
352 | value = 2; | |
353 | else | |
354 | fatal("%.200s line %d: Bad yes/no/ask argument.", filename, linenum); | |
355 | if (*activep && *intptr == -1) | |
356 | *intptr = value; | |
357 | break; | |
358 | ||
359 | case oCompression: | |
360 | intptr = &options->compression; | |
361 | goto parse_flag; | |
362 | ||
363 | case oKeepAlives: | |
364 | intptr = &options->keepalives; | |
365 | goto parse_flag; | |
366 | ||
367 | case oNumberOfPasswordPrompts: | |
368 | intptr = &options->number_of_password_prompts; | |
369 | goto parse_int; | |
370 | ||
371 | case oTISAuthentication: | |
372 | cp = strtok(NULL, WHITESPACE); | |
373 | if (cp != 0 && (strcmp(cp, "yes") == 0 || strcmp(cp, "true") == 0)) | |
374 | fprintf(stderr, | |
375 | "%.99s line %d: Warning, TIS is not supported.\n", | |
376 | filename, | |
377 | linenum); | |
378 | break; | |
379 | ||
380 | case oCompressionLevel: | |
381 | intptr = &options->compression_level; | |
382 | goto parse_int; | |
383 | ||
384 | case oIdentityFile: | |
385 | cp = strtok(NULL, WHITESPACE); | |
386 | if (!cp) | |
387 | fatal("%.200s line %d: Missing argument.", filename, linenum); | |
388 | if (*activep) | |
389 | { | |
390 | if (options->num_identity_files >= SSH_MAX_IDENTITY_FILES) | |
391 | fatal("%.200s line %d: Too many identity files specified (max %d).", | |
392 | filename, linenum, SSH_MAX_IDENTITY_FILES); | |
393 | options->identity_files[options->num_identity_files++] = xstrdup(cp); | |
394 | } | |
395 | break; | |
396 | ||
397 | case oUser: | |
398 | charptr = &options->user; | |
399 | parse_string: | |
400 | cp = strtok(NULL, WHITESPACE); | |
401 | if (!cp) | |
402 | fatal("%.200s line %d: Missing argument.", filename, linenum); | |
403 | if (*activep && *charptr == NULL) | |
404 | *charptr = xstrdup(cp); | |
405 | break; | |
406 | ||
407 | case oGlobalKnownHostsFile: | |
408 | charptr = &options->system_hostfile; | |
409 | goto parse_string; | |
410 | ||
411 | case oUserKnownHostsFile: | |
412 | charptr = &options->user_hostfile; | |
413 | goto parse_string; | |
414 | ||
415 | case oHostName: | |
416 | charptr = &options->hostname; | |
417 | goto parse_string; | |
418 | ||
419 | case oProxyCommand: | |
420 | charptr = &options->proxy_command; | |
421 | string = xstrdup(""); | |
422 | while ((cp = strtok(NULL, WHITESPACE)) != NULL) | |
423 | { | |
424 | string = xrealloc(string, strlen(string) + strlen(cp) + 2); | |
425 | strcat(string, " "); | |
426 | strcat(string, cp); | |
427 | } | |
428 | if (*activep && *charptr == NULL) | |
429 | *charptr = string; | |
430 | else | |
431 | xfree(string); | |
e7c0f9d5 | 432 | return 0; |
8efc0c15 | 433 | |
434 | case oPort: | |
435 | intptr = &options->port; | |
436 | parse_int: | |
437 | cp = strtok(NULL, WHITESPACE); | |
438 | if (!cp) | |
439 | fatal("%.200s line %d: Missing argument.", filename, linenum); | |
440 | if (cp[0] < '0' || cp[0] > '9') | |
441 | fatal("%.200s line %d: Bad number.", filename, linenum); | |
442 | #if 0 | |
443 | value = atoi(cp); | |
444 | #else | |
445 | { | |
446 | char *ptr; | |
447 | value = strtol(cp, &ptr, 0); /* Octal, decimal, or hex format? */ | |
448 | if (cp == ptr) | |
449 | fatal("%.200s line %d: Bad number.", filename, linenum); | |
450 | } | |
451 | #endif | |
452 | if (*activep && *intptr == -1) | |
453 | *intptr = value; | |
454 | break; | |
455 | ||
456 | case oConnectionAttempts: | |
457 | intptr = &options->connection_attempts; | |
458 | goto parse_int; | |
459 | ||
460 | case oCipher: | |
461 | intptr = &options->cipher; | |
462 | cp = strtok(NULL, WHITESPACE); | |
463 | value = cipher_number(cp); | |
464 | if (value == -1) | |
465 | fatal("%.200s line %d: Bad cipher.", filename, linenum); | |
466 | if (*activep && *intptr == -1) | |
467 | *intptr = value; | |
468 | break; | |
6a17f9c2 | 469 | |
470 | case oLogLevel: | |
471 | cp = strtok(NULL, WHITESPACE); | |
472 | if (!cp) | |
473 | { | |
474 | fprintf(stderr, "%s line %d: missing level name.\n", | |
475 | filename, linenum); | |
476 | exit(1); | |
477 | } | |
478 | for (i = 0; log_levels[i].name; i++) | |
479 | if (strcasecmp(log_levels[i].name, cp) == 0) | |
480 | break; | |
481 | if (!log_levels[i].name) | |
482 | { | |
483 | fprintf(stderr, "%s line %d: unsupported log level %s\n", | |
484 | filename, linenum, cp); | |
485 | exit(1); | |
486 | } | |
487 | if (options->log_level == (LogLevel)(-1)) | |
488 | options->log_level = log_levels[i].level; | |
489 | break; | |
8efc0c15 | 490 | |
491 | case oRemoteForward: | |
492 | cp = strtok(NULL, WHITESPACE); | |
493 | if (!cp) | |
494 | fatal("%.200s line %d: Missing argument.", filename, linenum); | |
495 | if (cp[0] < '0' || cp[0] > '9') | |
496 | fatal("%.200s line %d: Badly formatted port number.", | |
497 | filename, linenum); | |
498 | fwd_port = atoi(cp); | |
499 | cp = strtok(NULL, WHITESPACE); | |
500 | if (!cp) | |
501 | fatal("%.200s line %d: Missing second argument.", | |
502 | filename, linenum); | |
503 | if (sscanf(cp, "%255[^:]:%d", buf, &fwd_host_port) != 2) | |
504 | fatal("%.200s line %d: Badly formatted host:port.", | |
505 | filename, linenum); | |
506 | if (*activep) | |
507 | add_remote_forward(options, fwd_port, buf, fwd_host_port); | |
508 | break; | |
509 | ||
510 | case oLocalForward: | |
511 | cp = strtok(NULL, WHITESPACE); | |
512 | if (!cp) | |
513 | fatal("%.200s line %d: Missing argument.", filename, linenum); | |
514 | if (cp[0] < '0' || cp[0] > '9') | |
515 | fatal("%.200s line %d: Badly formatted port number.", | |
516 | filename, linenum); | |
517 | fwd_port = atoi(cp); | |
518 | cp = strtok(NULL, WHITESPACE); | |
519 | if (!cp) | |
520 | fatal("%.200s line %d: Missing second argument.", | |
521 | filename, linenum); | |
522 | if (sscanf(cp, "%255[^:]:%d", buf, &fwd_host_port) != 2) | |
523 | fatal("%.200s line %d: Badly formatted host:port.", | |
524 | filename, linenum); | |
525 | if (*activep) | |
526 | add_local_forward(options, fwd_port, buf, fwd_host_port); | |
527 | break; | |
528 | ||
529 | case oHost: | |
530 | *activep = 0; | |
531 | while ((cp = strtok(NULL, WHITESPACE)) != NULL) | |
532 | if (match_pattern(host, cp)) | |
533 | { | |
534 | debug("Applying options for %.100s", cp); | |
535 | *activep = 1; | |
536 | break; | |
537 | } | |
538 | /* Avoid garbage check below, as strtok already returned NULL. */ | |
e7c0f9d5 | 539 | return 0; |
8efc0c15 | 540 | |
541 | case oEscapeChar: | |
542 | intptr = &options->escape_char; | |
543 | cp = strtok(NULL, WHITESPACE); | |
544 | if (!cp) | |
545 | fatal("%.200s line %d: Missing argument.", filename, linenum); | |
546 | if (cp[0] == '^' && cp[2] == 0 && | |
547 | (unsigned char)cp[1] >= 64 && (unsigned char)cp[1] < 128) | |
548 | value = (unsigned char)cp[1] & 31; | |
549 | else | |
550 | if (strlen(cp) == 1) | |
551 | value = (unsigned char)cp[0]; | |
552 | else | |
553 | if (strcmp(cp, "none") == 0) | |
554 | value = -2; | |
555 | else | |
556 | { | |
557 | fatal("%.200s line %d: Bad escape character.", | |
558 | filename, linenum); | |
559 | /*NOTREACHED*/ | |
560 | value = 0; /* Avoid compiler warning. */ | |
561 | } | |
562 | if (*activep && *intptr == -1) | |
563 | *intptr = value; | |
564 | break; | |
565 | ||
566 | default: | |
e7c0f9d5 | 567 | fatal("process_config_line: Unimplemented opcode %d", opcode); |
8efc0c15 | 568 | } |
569 | ||
570 | /* Check that there is no garbage at end of line. */ | |
571 | if (strtok(NULL, WHITESPACE) != NULL) | |
572 | fatal("%.200s line %d: garbage at end of line.", | |
573 | filename, linenum); | |
e7c0f9d5 | 574 | return 0; |
8efc0c15 | 575 | } |
576 | ||
577 | ||
578 | /* Reads the config file and modifies the options accordingly. Options should | |
579 | already be initialized before this call. This never returns if there | |
580 | is an error. If the file does not exist, this returns immediately. */ | |
581 | ||
582 | void read_config_file(const char *filename, const char *host, Options *options) | |
583 | { | |
584 | FILE *f; | |
585 | char line[1024]; | |
586 | int active, linenum; | |
e7c0f9d5 | 587 | int bad_options = 0; |
8efc0c15 | 588 | |
589 | /* Open the file. */ | |
590 | f = fopen(filename, "r"); | |
591 | if (!f) | |
592 | return; | |
593 | ||
594 | debug("Reading configuration data %.200s", filename); | |
595 | ||
596 | /* Mark that we are now processing the options. This flag is turned on/off | |
597 | by Host specifications. */ | |
598 | active = 1; | |
599 | linenum = 0; | |
600 | while (fgets(line, sizeof(line), f)) | |
601 | { | |
602 | /* Update line number counter. */ | |
603 | linenum++; | |
e7c0f9d5 | 604 | if (process_config_line(options, host, line, filename, linenum, &active) != 0) |
605 | bad_options++; | |
8efc0c15 | 606 | } |
607 | fclose(f); | |
e7c0f9d5 | 608 | if (bad_options > 0) |
609 | fatal("%s: terminating, %d bad configuration options\n", | |
610 | filename, bad_options); | |
8efc0c15 | 611 | } |
612 | ||
613 | /* Initializes options to special values that indicate that they have not | |
614 | yet been set. Read_config_file will only set options with this value. | |
615 | Options are processed in the following order: command line, user config | |
616 | file, system config file. Last, fill_default_options is called. */ | |
617 | ||
618 | void initialize_options(Options *options) | |
619 | { | |
620 | memset(options, 'X', sizeof(*options)); | |
621 | options->forward_agent = -1; | |
622 | options->forward_x11 = -1; | |
623 | options->gateway_ports = -1; | |
624 | options->use_privileged_port = -1; | |
625 | options->rhosts_authentication = -1; | |
626 | options->rsa_authentication = -1; | |
627 | #ifdef KRB4 | |
628 | options->kerberos_authentication = -1; | |
629 | #endif | |
630 | #ifdef AFS | |
631 | options->kerberos_tgt_passing = -1; | |
632 | options->afs_token_passing = -1; | |
633 | #endif | |
634 | options->password_authentication = -1; | |
635 | options->rhosts_rsa_authentication = -1; | |
636 | options->fallback_to_rsh = -1; | |
637 | options->use_rsh = -1; | |
638 | options->batch_mode = -1; | |
639 | options->check_host_ip = -1; | |
640 | options->strict_host_key_checking = -1; | |
641 | options->compression = -1; | |
642 | options->keepalives = -1; | |
643 | options->compression_level = -1; | |
644 | options->port = -1; | |
645 | options->connection_attempts = -1; | |
646 | options->number_of_password_prompts = -1; | |
647 | options->cipher = -1; | |
648 | options->num_identity_files = 0; | |
649 | options->hostname = NULL; | |
650 | options->proxy_command = NULL; | |
651 | options->user = NULL; | |
652 | options->escape_char = -1; | |
653 | options->system_hostfile = NULL; | |
654 | options->user_hostfile = NULL; | |
655 | options->num_local_forwards = 0; | |
656 | options->num_remote_forwards = 0; | |
6a17f9c2 | 657 | options->log_level = (LogLevel)-1; |
8efc0c15 | 658 | } |
659 | ||
660 | /* Called after processing other sources of option data, this fills those | |
661 | options for which no value has been specified with their default values. */ | |
662 | ||
663 | void fill_default_options(Options *options) | |
664 | { | |
665 | if (options->forward_agent == -1) | |
666 | options->forward_agent = 1; | |
667 | if (options->forward_x11 == -1) | |
668 | options->forward_x11 = 1; | |
669 | if (options->gateway_ports == -1) | |
670 | options->gateway_ports = 0; | |
671 | if (options->use_privileged_port == -1) | |
672 | options->use_privileged_port = 1; | |
673 | if (options->rhosts_authentication == -1) | |
674 | options->rhosts_authentication = 1; | |
675 | if (options->rsa_authentication == -1) | |
676 | options->rsa_authentication = 1; | |
677 | #ifdef KRB4 | |
678 | if (options->kerberos_authentication == -1) | |
679 | options->kerberos_authentication = 1; | |
680 | #endif /* KRB4 */ | |
681 | #ifdef AFS | |
682 | if (options->kerberos_tgt_passing == -1) | |
683 | options->kerberos_tgt_passing = 1; | |
684 | if (options->afs_token_passing == -1) | |
685 | options->afs_token_passing = 1; | |
686 | #endif /* AFS */ | |
687 | if (options->password_authentication == -1) | |
688 | options->password_authentication = 1; | |
689 | if (options->rhosts_rsa_authentication == -1) | |
690 | options->rhosts_rsa_authentication = 1; | |
691 | if (options->fallback_to_rsh == -1) | |
692 | options->fallback_to_rsh = 1; | |
693 | if (options->use_rsh == -1) | |
694 | options->use_rsh = 0; | |
695 | if (options->batch_mode == -1) | |
696 | options->batch_mode = 0; | |
697 | if (options->check_host_ip == -1) | |
698 | options->check_host_ip = 1; | |
699 | if (options->strict_host_key_checking == -1) | |
700 | options->strict_host_key_checking = 2; /* 2 is default */ | |
701 | if (options->compression == -1) | |
702 | options->compression = 0; | |
703 | if (options->keepalives == -1) | |
704 | options->keepalives = 1; | |
705 | if (options->compression_level == -1) | |
706 | options->compression_level = 6; | |
707 | if (options->port == -1) | |
708 | options->port = 0; /* Filled in ssh_connect. */ | |
709 | if (options->connection_attempts == -1) | |
710 | options->connection_attempts = 4; | |
711 | if (options->number_of_password_prompts == -1) | |
712 | options->number_of_password_prompts = 3; | |
713 | if (options->cipher == -1) | |
714 | options->cipher = SSH_CIPHER_NOT_SET; /* Selected in ssh_login(). */ | |
715 | if (options->num_identity_files == 0) | |
716 | { | |
717 | options->identity_files[0] = | |
718 | xmalloc(2 + strlen(SSH_CLIENT_IDENTITY) + 1); | |
719 | sprintf(options->identity_files[0], "~/%.100s", SSH_CLIENT_IDENTITY); | |
720 | options->num_identity_files = 1; | |
721 | } | |
722 | if (options->escape_char == -1) | |
723 | options->escape_char = '~'; | |
724 | if (options->system_hostfile == NULL) | |
725 | options->system_hostfile = SSH_SYSTEM_HOSTFILE; | |
726 | if (options->user_hostfile == NULL) | |
727 | options->user_hostfile = SSH_USER_HOSTFILE; | |
6a17f9c2 | 728 | if (options->log_level == (LogLevel)-1) |
729 | options->log_level = SYSLOG_LEVEL_INFO; | |
8efc0c15 | 730 | /* options->proxy_command should not be set by default */ |
731 | /* options->user will be set in the main program if appropriate */ | |
732 | /* options->hostname will be set in the main program if appropriate */ | |
733 | } | |
734 |