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Commit | Line | Data |
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8efc0c15 | 1 | /* |
6ae2364d | 2 | * |
5260325f | 3 | * readconf.c |
6ae2364d | 4 | * |
5260325f | 5 | * Author: Tatu Ylonen <ylo@cs.hut.fi> |
6ae2364d | 6 | * |
5260325f | 7 | * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland |
8 | * All rights reserved | |
6ae2364d | 9 | * |
5260325f | 10 | * Created: Sat Apr 22 00:03:10 1995 ylo |
6ae2364d | 11 | * |
5260325f | 12 | * Functions for reading the configuration files. |
6ae2364d | 13 | * |
5260325f | 14 | */ |
8efc0c15 | 15 | |
16 | #include "includes.h" | |
17 | RCSID("$Id$"); | |
18 | ||
19 | #include "ssh.h" | |
20 | #include "cipher.h" | |
21 | #include "readconf.h" | |
7368a6c8 | 22 | #include "match.h" |
8efc0c15 | 23 | #include "xmalloc.h" |
a8be9f80 | 24 | #include "compat.h" |
8efc0c15 | 25 | |
26 | /* Format of the configuration file: | |
27 | ||
28 | # Configuration data is parsed as follows: | |
29 | # 1. command line options | |
30 | # 2. user-specific file | |
31 | # 3. system-wide file | |
32 | # Any configuration value is only changed the first time it is set. | |
33 | # Thus, host-specific definitions should be at the beginning of the | |
34 | # configuration file, and defaults at the end. | |
35 | ||
36 | # Host-specific declarations. These may override anything above. A single | |
37 | # host may match multiple declarations; these are processed in the order | |
38 | # that they are given in. | |
39 | ||
40 | Host *.ngs.fi ngs.fi | |
41 | FallBackToRsh no | |
42 | ||
43 | Host fake.com | |
44 | HostName another.host.name.real.org | |
45 | User blaah | |
46 | Port 34289 | |
47 | ForwardX11 no | |
48 | ForwardAgent no | |
49 | ||
50 | Host books.com | |
51 | RemoteForward 9999 shadows.cs.hut.fi:9999 | |
52 | Cipher 3des | |
53 | ||
54 | Host fascist.blob.com | |
55 | Port 23123 | |
56 | User tylonen | |
57 | RhostsAuthentication no | |
58 | PasswordAuthentication no | |
59 | ||
60 | Host puukko.hut.fi | |
61 | User t35124p | |
62 | ProxyCommand ssh-proxy %h %p | |
63 | ||
64 | Host *.fr | |
65 | UseRsh yes | |
66 | ||
67 | Host *.su | |
68 | Cipher none | |
69 | PasswordAuthentication no | |
70 | ||
71 | # Defaults for various options | |
72 | Host * | |
73 | ForwardAgent no | |
74 | ForwardX11 yes | |
75 | RhostsAuthentication yes | |
76 | PasswordAuthentication yes | |
77 | RSAAuthentication yes | |
78 | RhostsRSAAuthentication yes | |
79 | FallBackToRsh no | |
80 | UseRsh no | |
81 | StrictHostKeyChecking yes | |
82 | KeepAlives no | |
83 | IdentityFile ~/.ssh/identity | |
84 | Port 22 | |
85 | EscapeChar ~ | |
86 | ||
87 | */ | |
88 | ||
89 | /* Keyword tokens. */ | |
90 | ||
5260325f | 91 | typedef enum { |
92 | oBadOption, | |
93 | oForwardAgent, oForwardX11, oGatewayPorts, oRhostsAuthentication, | |
94 | oPasswordAuthentication, oRSAAuthentication, oFallBackToRsh, oUseRsh, | |
95 | oSkeyAuthentication, | |
8efc0c15 | 96 | #ifdef KRB4 |
5260325f | 97 | oKerberosAuthentication, |
8efc0c15 | 98 | #endif /* KRB4 */ |
99 | #ifdef AFS | |
5260325f | 100 | oKerberosTgtPassing, oAFSTokenPassing, |
8efc0c15 | 101 | #endif |
5260325f | 102 | oIdentityFile, oHostName, oPort, oCipher, oRemoteForward, oLocalForward, |
103 | oUser, oHost, oEscapeChar, oRhostsRSAAuthentication, oProxyCommand, | |
104 | oGlobalKnownHostsFile, oUserKnownHostsFile, oConnectionAttempts, | |
105 | oBatchMode, oCheckHostIP, oStrictHostKeyChecking, oCompression, | |
106 | oCompressionLevel, oKeepAlives, oNumberOfPasswordPrompts, oTISAuthentication, | |
a306f2dd | 107 | oUsePrivilegedPort, oLogLevel, oCiphers, oProtocol, oIdentityFile2, |
1d1ffb87 | 108 | oGlobalKnownHostsFile2, oUserKnownHostsFile2, oDSAAuthentication |
8efc0c15 | 109 | } OpCodes; |
110 | ||
111 | /* Textual representations of the tokens. */ | |
112 | ||
5260325f | 113 | static struct { |
114 | const char *name; | |
115 | OpCodes opcode; | |
116 | } keywords[] = { | |
117 | { "forwardagent", oForwardAgent }, | |
118 | { "forwardx11", oForwardX11 }, | |
119 | { "gatewayports", oGatewayPorts }, | |
120 | { "useprivilegedport", oUsePrivilegedPort }, | |
121 | { "rhostsauthentication", oRhostsAuthentication }, | |
122 | { "passwordauthentication", oPasswordAuthentication }, | |
123 | { "rsaauthentication", oRSAAuthentication }, | |
1d1ffb87 | 124 | { "dsaauthentication", oDSAAuthentication }, |
5260325f | 125 | { "skeyauthentication", oSkeyAuthentication }, |
8efc0c15 | 126 | #ifdef KRB4 |
5260325f | 127 | { "kerberosauthentication", oKerberosAuthentication }, |
8efc0c15 | 128 | #endif /* KRB4 */ |
129 | #ifdef AFS | |
5260325f | 130 | { "kerberostgtpassing", oKerberosTgtPassing }, |
131 | { "afstokenpassing", oAFSTokenPassing }, | |
8efc0c15 | 132 | #endif |
5260325f | 133 | { "fallbacktorsh", oFallBackToRsh }, |
134 | { "usersh", oUseRsh }, | |
135 | { "identityfile", oIdentityFile }, | |
a306f2dd | 136 | { "identityfile2", oIdentityFile2 }, |
5260325f | 137 | { "hostname", oHostName }, |
138 | { "proxycommand", oProxyCommand }, | |
139 | { "port", oPort }, | |
140 | { "cipher", oCipher }, | |
a8be9f80 | 141 | { "ciphers", oCiphers }, |
142 | { "protocol", oProtocol }, | |
5260325f | 143 | { "remoteforward", oRemoteForward }, |
144 | { "localforward", oLocalForward }, | |
145 | { "user", oUser }, | |
146 | { "host", oHost }, | |
147 | { "escapechar", oEscapeChar }, | |
148 | { "rhostsrsaauthentication", oRhostsRSAAuthentication }, | |
149 | { "globalknownhostsfile", oGlobalKnownHostsFile }, | |
150 | { "userknownhostsfile", oUserKnownHostsFile }, | |
a306f2dd | 151 | { "globalknownhostsfile2", oGlobalKnownHostsFile2 }, |
152 | { "userknownhostsfile2", oUserKnownHostsFile2 }, | |
5260325f | 153 | { "connectionattempts", oConnectionAttempts }, |
154 | { "batchmode", oBatchMode }, | |
155 | { "checkhostip", oCheckHostIP }, | |
156 | { "stricthostkeychecking", oStrictHostKeyChecking }, | |
157 | { "compression", oCompression }, | |
158 | { "compressionlevel", oCompressionLevel }, | |
159 | { "keepalive", oKeepAlives }, | |
160 | { "numberofpasswordprompts", oNumberOfPasswordPrompts }, | |
161 | { "tisauthentication", oTISAuthentication }, | |
162 | { "loglevel", oLogLevel }, | |
163 | { NULL, 0 } | |
6a17f9c2 | 164 | }; |
165 | ||
8efc0c15 | 166 | /* Characters considered whitespace in strtok calls. */ |
167 | #define WHITESPACE " \t\r\n" | |
168 | ||
169 | ||
aa3378df | 170 | /* |
171 | * Adds a local TCP/IP port forward to options. Never returns if there is an | |
172 | * error. | |
173 | */ | |
8efc0c15 | 174 | |
6ae2364d | 175 | void |
57112b5a | 176 | add_local_forward(Options *options, u_short port, const char *host, |
177 | u_short host_port) | |
8efc0c15 | 178 | { |
5260325f | 179 | Forward *fwd; |
180 | extern uid_t original_real_uid; | |
5260325f | 181 | if (port < IPPORT_RESERVED && original_real_uid != 0) |
182 | fatal("Privileged ports can only be forwarded by root.\n"); | |
183 | if (options->num_local_forwards >= SSH_MAX_FORWARDS_PER_DIRECTION) | |
184 | fatal("Too many local forwards (max %d).", SSH_MAX_FORWARDS_PER_DIRECTION); | |
185 | fwd = &options->local_forwards[options->num_local_forwards++]; | |
186 | fwd->port = port; | |
187 | fwd->host = xstrdup(host); | |
188 | fwd->host_port = host_port; | |
8efc0c15 | 189 | } |
190 | ||
aa3378df | 191 | /* |
192 | * Adds a remote TCP/IP port forward to options. Never returns if there is | |
193 | * an error. | |
194 | */ | |
8efc0c15 | 195 | |
6ae2364d | 196 | void |
57112b5a | 197 | add_remote_forward(Options *options, u_short port, const char *host, |
198 | u_short host_port) | |
8efc0c15 | 199 | { |
5260325f | 200 | Forward *fwd; |
201 | if (options->num_remote_forwards >= SSH_MAX_FORWARDS_PER_DIRECTION) | |
202 | fatal("Too many remote forwards (max %d).", | |
203 | SSH_MAX_FORWARDS_PER_DIRECTION); | |
204 | fwd = &options->remote_forwards[options->num_remote_forwards++]; | |
205 | fwd->port = port; | |
206 | fwd->host = xstrdup(host); | |
207 | fwd->host_port = host_port; | |
8efc0c15 | 208 | } |
209 | ||
aa3378df | 210 | /* |
211 | * Returns the number of the token pointed to by cp of length len. Never | |
212 | * returns if the token is not known. | |
213 | */ | |
8efc0c15 | 214 | |
6ae2364d | 215 | static OpCodes |
5260325f | 216 | parse_token(const char *cp, const char *filename, int linenum) |
8efc0c15 | 217 | { |
5260325f | 218 | unsigned int i; |
8efc0c15 | 219 | |
5260325f | 220 | for (i = 0; keywords[i].name; i++) |
aa3378df | 221 | if (strcasecmp(cp, keywords[i].name) == 0) |
5260325f | 222 | return keywords[i].opcode; |
8efc0c15 | 223 | |
5260325f | 224 | fprintf(stderr, "%s: line %d: Bad configuration option: %s\n", |
225 | filename, linenum, cp); | |
226 | return oBadOption; | |
8efc0c15 | 227 | } |
228 | ||
aa3378df | 229 | /* |
230 | * Processes a single option line as used in the configuration files. This | |
231 | * only sets those values that have not already been set. | |
232 | */ | |
8efc0c15 | 233 | |
e7c0f9d5 | 234 | int |
235 | process_config_line(Options *options, const char *host, | |
5260325f | 236 | char *line, const char *filename, int linenum, |
237 | int *activep) | |
8efc0c15 | 238 | { |
aa3378df | 239 | char buf[256], *cp, *string, **charptr, *cp2; |
57112b5a | 240 | int opcode, *intptr, value; |
241 | u_short fwd_port, fwd_host_port; | |
5260325f | 242 | |
243 | /* Skip leading whitespace. */ | |
244 | cp = line + strspn(line, WHITESPACE); | |
245 | if (!*cp || *cp == '\n' || *cp == '#') | |
246 | return 0; | |
247 | ||
aa3378df | 248 | /* Get the keyword. (Each line is supposed to begin with a keyword). */ |
5260325f | 249 | cp = strtok(cp, WHITESPACE); |
5260325f | 250 | opcode = parse_token(cp, filename, linenum); |
251 | ||
252 | switch (opcode) { | |
253 | case oBadOption: | |
aa3378df | 254 | /* don't panic, but count bad options */ |
255 | return -1; | |
5260325f | 256 | /* NOTREACHED */ |
257 | case oForwardAgent: | |
258 | intptr = &options->forward_agent; | |
259 | parse_flag: | |
260 | cp = strtok(NULL, WHITESPACE); | |
261 | if (!cp) | |
262 | fatal("%.200s line %d: Missing yes/no argument.", filename, linenum); | |
263 | value = 0; /* To avoid compiler warning... */ | |
264 | if (strcmp(cp, "yes") == 0 || strcmp(cp, "true") == 0) | |
265 | value = 1; | |
266 | else if (strcmp(cp, "no") == 0 || strcmp(cp, "false") == 0) | |
267 | value = 0; | |
268 | else | |
269 | fatal("%.200s line %d: Bad yes/no argument.", filename, linenum); | |
270 | if (*activep && *intptr == -1) | |
271 | *intptr = value; | |
272 | break; | |
273 | ||
274 | case oForwardX11: | |
275 | intptr = &options->forward_x11; | |
276 | goto parse_flag; | |
277 | ||
278 | case oGatewayPorts: | |
279 | intptr = &options->gateway_ports; | |
280 | goto parse_flag; | |
281 | ||
282 | case oUsePrivilegedPort: | |
283 | intptr = &options->use_privileged_port; | |
284 | goto parse_flag; | |
285 | ||
286 | case oRhostsAuthentication: | |
287 | intptr = &options->rhosts_authentication; | |
288 | goto parse_flag; | |
289 | ||
290 | case oPasswordAuthentication: | |
291 | intptr = &options->password_authentication; | |
292 | goto parse_flag; | |
293 | ||
1d1ffb87 | 294 | case oDSAAuthentication: |
295 | intptr = &options->dsa_authentication; | |
296 | goto parse_flag; | |
297 | ||
5260325f | 298 | case oRSAAuthentication: |
299 | intptr = &options->rsa_authentication; | |
300 | goto parse_flag; | |
301 | ||
302 | case oRhostsRSAAuthentication: | |
303 | intptr = &options->rhosts_rsa_authentication; | |
304 | goto parse_flag; | |
305 | ||
306 | case oTISAuthentication: | |
307 | /* fallthrough, there is no difference on the client side */ | |
308 | case oSkeyAuthentication: | |
309 | intptr = &options->skey_authentication; | |
310 | goto parse_flag; | |
8efc0c15 | 311 | |
312 | #ifdef KRB4 | |
5260325f | 313 | case oKerberosAuthentication: |
314 | intptr = &options->kerberos_authentication; | |
315 | goto parse_flag; | |
8efc0c15 | 316 | #endif /* KRB4 */ |
317 | ||
318 | #ifdef AFS | |
5260325f | 319 | case oKerberosTgtPassing: |
320 | intptr = &options->kerberos_tgt_passing; | |
321 | goto parse_flag; | |
8efc0c15 | 322 | |
5260325f | 323 | case oAFSTokenPassing: |
324 | intptr = &options->afs_token_passing; | |
325 | goto parse_flag; | |
8efc0c15 | 326 | #endif |
5260325f | 327 | |
328 | case oFallBackToRsh: | |
329 | intptr = &options->fallback_to_rsh; | |
330 | goto parse_flag; | |
331 | ||
332 | case oUseRsh: | |
333 | intptr = &options->use_rsh; | |
334 | goto parse_flag; | |
335 | ||
336 | case oBatchMode: | |
337 | intptr = &options->batch_mode; | |
338 | goto parse_flag; | |
339 | ||
340 | case oCheckHostIP: | |
341 | intptr = &options->check_host_ip; | |
342 | goto parse_flag; | |
343 | ||
344 | case oStrictHostKeyChecking: | |
345 | intptr = &options->strict_host_key_checking; | |
346 | cp = strtok(NULL, WHITESPACE); | |
347 | if (!cp) | |
348 | fatal("%.200s line %d: Missing yes/no argument.", | |
349 | filename, linenum); | |
350 | value = 0; /* To avoid compiler warning... */ | |
351 | if (strcmp(cp, "yes") == 0 || strcmp(cp, "true") == 0) | |
352 | value = 1; | |
353 | else if (strcmp(cp, "no") == 0 || strcmp(cp, "false") == 0) | |
354 | value = 0; | |
355 | else if (strcmp(cp, "ask") == 0) | |
356 | value = 2; | |
357 | else | |
358 | fatal("%.200s line %d: Bad yes/no/ask argument.", filename, linenum); | |
359 | if (*activep && *intptr == -1) | |
360 | *intptr = value; | |
361 | break; | |
362 | ||
363 | case oCompression: | |
364 | intptr = &options->compression; | |
365 | goto parse_flag; | |
366 | ||
367 | case oKeepAlives: | |
368 | intptr = &options->keepalives; | |
369 | goto parse_flag; | |
370 | ||
371 | case oNumberOfPasswordPrompts: | |
372 | intptr = &options->number_of_password_prompts; | |
373 | goto parse_int; | |
374 | ||
375 | case oCompressionLevel: | |
376 | intptr = &options->compression_level; | |
377 | goto parse_int; | |
378 | ||
379 | case oIdentityFile: | |
a306f2dd | 380 | case oIdentityFile2: |
5260325f | 381 | cp = strtok(NULL, WHITESPACE); |
382 | if (!cp) | |
383 | fatal("%.200s line %d: Missing argument.", filename, linenum); | |
384 | if (*activep) { | |
a306f2dd | 385 | intptr = (opcode == oIdentityFile) ? |
386 | &options->num_identity_files : | |
387 | &options->num_identity_files2; | |
388 | if (*intptr >= SSH_MAX_IDENTITY_FILES) | |
5260325f | 389 | fatal("%.200s line %d: Too many identity files specified (max %d).", |
390 | filename, linenum, SSH_MAX_IDENTITY_FILES); | |
a306f2dd | 391 | charptr = (opcode == oIdentityFile) ? |
392 | &options->identity_files[*intptr] : | |
393 | &options->identity_files2[*intptr]; | |
394 | *charptr = xstrdup(cp); | |
395 | *intptr = *intptr + 1; | |
5260325f | 396 | } |
397 | break; | |
398 | ||
399 | case oUser: | |
400 | charptr = &options->user; | |
401 | parse_string: | |
402 | cp = strtok(NULL, WHITESPACE); | |
403 | if (!cp) | |
404 | fatal("%.200s line %d: Missing argument.", filename, linenum); | |
405 | if (*activep && *charptr == NULL) | |
406 | *charptr = xstrdup(cp); | |
407 | break; | |
408 | ||
409 | case oGlobalKnownHostsFile: | |
410 | charptr = &options->system_hostfile; | |
411 | goto parse_string; | |
412 | ||
413 | case oUserKnownHostsFile: | |
414 | charptr = &options->user_hostfile; | |
415 | goto parse_string; | |
416 | ||
a306f2dd | 417 | case oGlobalKnownHostsFile2: |
418 | charptr = &options->system_hostfile2; | |
419 | goto parse_string; | |
420 | ||
421 | case oUserKnownHostsFile2: | |
422 | charptr = &options->user_hostfile2; | |
423 | goto parse_string; | |
424 | ||
5260325f | 425 | case oHostName: |
426 | charptr = &options->hostname; | |
427 | goto parse_string; | |
428 | ||
429 | case oProxyCommand: | |
430 | charptr = &options->proxy_command; | |
431 | string = xstrdup(""); | |
432 | while ((cp = strtok(NULL, WHITESPACE)) != NULL) { | |
433 | string = xrealloc(string, strlen(string) + strlen(cp) + 2); | |
434 | strcat(string, " "); | |
435 | strcat(string, cp); | |
436 | } | |
437 | if (*activep && *charptr == NULL) | |
438 | *charptr = string; | |
439 | else | |
440 | xfree(string); | |
441 | return 0; | |
442 | ||
443 | case oPort: | |
444 | intptr = &options->port; | |
445 | parse_int: | |
446 | cp = strtok(NULL, WHITESPACE); | |
447 | if (!cp) | |
448 | fatal("%.200s line %d: Missing argument.", filename, linenum); | |
449 | if (cp[0] < '0' || cp[0] > '9') | |
450 | fatal("%.200s line %d: Bad number.", filename, linenum); | |
aa3378df | 451 | |
452 | /* Octal, decimal, or hex format? */ | |
453 | value = strtol(cp, &cp2, 0); | |
454 | if (cp == cp2) | |
455 | fatal("%.200s line %d: Bad number.", filename, linenum); | |
5260325f | 456 | if (*activep && *intptr == -1) |
457 | *intptr = value; | |
458 | break; | |
459 | ||
460 | case oConnectionAttempts: | |
461 | intptr = &options->connection_attempts; | |
462 | goto parse_int; | |
463 | ||
464 | case oCipher: | |
465 | intptr = &options->cipher; | |
466 | cp = strtok(NULL, WHITESPACE); | |
467 | value = cipher_number(cp); | |
468 | if (value == -1) | |
469 | fatal("%.200s line %d: Bad cipher '%s'.", | |
470 | filename, linenum, cp ? cp : "<NONE>"); | |
471 | if (*activep && *intptr == -1) | |
472 | *intptr = value; | |
473 | break; | |
474 | ||
a8be9f80 | 475 | case oCiphers: |
476 | cp = strtok(NULL, WHITESPACE); | |
477 | if (!ciphers_valid(cp)) | |
d0c832f3 | 478 | fatal("%.200s line %d: Bad SSH2 cipher spec '%s'.", |
a8be9f80 | 479 | filename, linenum, cp ? cp : "<NONE>"); |
480 | if (*activep && options->ciphers == NULL) | |
481 | options->ciphers = xstrdup(cp); | |
482 | break; | |
483 | ||
484 | case oProtocol: | |
485 | intptr = &options->protocol; | |
486 | cp = strtok(NULL, WHITESPACE); | |
487 | value = proto_spec(cp); | |
488 | if (value == SSH_PROTO_UNKNOWN) | |
489 | fatal("%.200s line %d: Bad protocol spec '%s'.", | |
490 | filename, linenum, cp ? cp : "<NONE>"); | |
491 | if (*activep && *intptr == SSH_PROTO_UNKNOWN) | |
492 | *intptr = value; | |
493 | break; | |
494 | ||
5260325f | 495 | case oLogLevel: |
496 | intptr = (int *) &options->log_level; | |
497 | cp = strtok(NULL, WHITESPACE); | |
498 | value = log_level_number(cp); | |
499 | if (value == (LogLevel) - 1) | |
500 | fatal("%.200s line %d: unsupported log level '%s'\n", | |
501 | filename, linenum, cp ? cp : "<NONE>"); | |
502 | if (*activep && (LogLevel) * intptr == -1) | |
503 | *intptr = (LogLevel) value; | |
504 | break; | |
505 | ||
506 | case oRemoteForward: | |
507 | cp = strtok(NULL, WHITESPACE); | |
508 | if (!cp) | |
509 | fatal("%.200s line %d: Missing argument.", filename, linenum); | |
510 | if (cp[0] < '0' || cp[0] > '9') | |
511 | fatal("%.200s line %d: Badly formatted port number.", | |
512 | filename, linenum); | |
513 | fwd_port = atoi(cp); | |
514 | cp = strtok(NULL, WHITESPACE); | |
515 | if (!cp) | |
516 | fatal("%.200s line %d: Missing second argument.", | |
517 | filename, linenum); | |
57112b5a | 518 | if (sscanf(cp, "%255[^:]:%hu", buf, &fwd_host_port) != 2) |
5260325f | 519 | fatal("%.200s line %d: Badly formatted host:port.", |
520 | filename, linenum); | |
521 | if (*activep) | |
522 | add_remote_forward(options, fwd_port, buf, fwd_host_port); | |
523 | break; | |
524 | ||
525 | case oLocalForward: | |
526 | cp = strtok(NULL, WHITESPACE); | |
527 | if (!cp) | |
528 | fatal("%.200s line %d: Missing argument.", filename, linenum); | |
529 | if (cp[0] < '0' || cp[0] > '9') | |
530 | fatal("%.200s line %d: Badly formatted port number.", | |
531 | filename, linenum); | |
532 | fwd_port = atoi(cp); | |
533 | cp = strtok(NULL, WHITESPACE); | |
534 | if (!cp) | |
535 | fatal("%.200s line %d: Missing second argument.", | |
536 | filename, linenum); | |
57112b5a | 537 | if (sscanf(cp, "%255[^:]:%hu", buf, &fwd_host_port) != 2) |
5260325f | 538 | fatal("%.200s line %d: Badly formatted host:port.", |
539 | filename, linenum); | |
540 | if (*activep) | |
541 | add_local_forward(options, fwd_port, buf, fwd_host_port); | |
542 | break; | |
543 | ||
544 | case oHost: | |
545 | *activep = 0; | |
546 | while ((cp = strtok(NULL, WHITESPACE)) != NULL) | |
547 | if (match_pattern(host, cp)) { | |
548 | debug("Applying options for %.100s", cp); | |
549 | *activep = 1; | |
550 | break; | |
551 | } | |
aa3378df | 552 | /* Avoid garbage check below, as strtok already returned NULL. */ |
5260325f | 553 | return 0; |
554 | ||
555 | case oEscapeChar: | |
556 | intptr = &options->escape_char; | |
557 | cp = strtok(NULL, WHITESPACE); | |
558 | if (!cp) | |
559 | fatal("%.200s line %d: Missing argument.", filename, linenum); | |
560 | if (cp[0] == '^' && cp[2] == 0 && | |
561 | (unsigned char) cp[1] >= 64 && (unsigned char) cp[1] < 128) | |
562 | value = (unsigned char) cp[1] & 31; | |
563 | else if (strlen(cp) == 1) | |
564 | value = (unsigned char) cp[0]; | |
565 | else if (strcmp(cp, "none") == 0) | |
566 | value = -2; | |
567 | else { | |
568 | fatal("%.200s line %d: Bad escape character.", | |
569 | filename, linenum); | |
570 | /* NOTREACHED */ | |
571 | value = 0; /* Avoid compiler warning. */ | |
572 | } | |
573 | if (*activep && *intptr == -1) | |
574 | *intptr = value; | |
575 | break; | |
576 | ||
577 | default: | |
578 | fatal("process_config_line: Unimplemented opcode %d", opcode); | |
579 | } | |
580 | ||
581 | /* Check that there is no garbage at end of line. */ | |
582 | if (strtok(NULL, WHITESPACE) != NULL) | |
583 | fatal("%.200s line %d: garbage at end of line.", | |
584 | filename, linenum); | |
585 | return 0; | |
8efc0c15 | 586 | } |
587 | ||
588 | ||
aa3378df | 589 | /* |
590 | * Reads the config file and modifies the options accordingly. Options | |
591 | * should already be initialized before this call. This never returns if | |
592 | * there is an error. If the file does not exist, this returns immediately. | |
593 | */ | |
8efc0c15 | 594 | |
6ae2364d | 595 | void |
5260325f | 596 | read_config_file(const char *filename, const char *host, Options *options) |
8efc0c15 | 597 | { |
5260325f | 598 | FILE *f; |
599 | char line[1024]; | |
600 | int active, linenum; | |
601 | int bad_options = 0; | |
602 | ||
603 | /* Open the file. */ | |
604 | f = fopen(filename, "r"); | |
605 | if (!f) | |
606 | return; | |
607 | ||
608 | debug("Reading configuration data %.200s", filename); | |
609 | ||
aa3378df | 610 | /* |
611 | * Mark that we are now processing the options. This flag is turned | |
612 | * on/off by Host specifications. | |
613 | */ | |
5260325f | 614 | active = 1; |
615 | linenum = 0; | |
616 | while (fgets(line, sizeof(line), f)) { | |
617 | /* Update line number counter. */ | |
618 | linenum++; | |
619 | if (process_config_line(options, host, line, filename, linenum, &active) != 0) | |
620 | bad_options++; | |
621 | } | |
622 | fclose(f); | |
623 | if (bad_options > 0) | |
624 | fatal("%s: terminating, %d bad configuration options\n", | |
625 | filename, bad_options); | |
8efc0c15 | 626 | } |
627 | ||
aa3378df | 628 | /* |
629 | * Initializes options to special values that indicate that they have not yet | |
630 | * been set. Read_config_file will only set options with this value. Options | |
631 | * are processed in the following order: command line, user config file, | |
632 | * system config file. Last, fill_default_options is called. | |
633 | */ | |
8efc0c15 | 634 | |
6ae2364d | 635 | void |
5260325f | 636 | initialize_options(Options * options) |
8efc0c15 | 637 | { |
5260325f | 638 | memset(options, 'X', sizeof(*options)); |
639 | options->forward_agent = -1; | |
640 | options->forward_x11 = -1; | |
641 | options->gateway_ports = -1; | |
642 | options->use_privileged_port = -1; | |
643 | options->rhosts_authentication = -1; | |
644 | options->rsa_authentication = -1; | |
1d1ffb87 | 645 | options->dsa_authentication = -1; |
5260325f | 646 | options->skey_authentication = -1; |
8efc0c15 | 647 | #ifdef KRB4 |
5260325f | 648 | options->kerberos_authentication = -1; |
8efc0c15 | 649 | #endif |
650 | #ifdef AFS | |
5260325f | 651 | options->kerberos_tgt_passing = -1; |
652 | options->afs_token_passing = -1; | |
8efc0c15 | 653 | #endif |
5260325f | 654 | options->password_authentication = -1; |
655 | options->rhosts_rsa_authentication = -1; | |
656 | options->fallback_to_rsh = -1; | |
657 | options->use_rsh = -1; | |
658 | options->batch_mode = -1; | |
659 | options->check_host_ip = -1; | |
660 | options->strict_host_key_checking = -1; | |
661 | options->compression = -1; | |
662 | options->keepalives = -1; | |
663 | options->compression_level = -1; | |
664 | options->port = -1; | |
665 | options->connection_attempts = -1; | |
666 | options->number_of_password_prompts = -1; | |
667 | options->cipher = -1; | |
a8be9f80 | 668 | options->ciphers = NULL; |
669 | options->protocol = SSH_PROTO_UNKNOWN; | |
5260325f | 670 | options->num_identity_files = 0; |
a306f2dd | 671 | options->num_identity_files2 = 0; |
5260325f | 672 | options->hostname = NULL; |
673 | options->proxy_command = NULL; | |
674 | options->user = NULL; | |
675 | options->escape_char = -1; | |
676 | options->system_hostfile = NULL; | |
677 | options->user_hostfile = NULL; | |
a306f2dd | 678 | options->system_hostfile2 = NULL; |
679 | options->user_hostfile2 = NULL; | |
5260325f | 680 | options->num_local_forwards = 0; |
681 | options->num_remote_forwards = 0; | |
682 | options->log_level = (LogLevel) - 1; | |
8efc0c15 | 683 | } |
684 | ||
aa3378df | 685 | /* |
686 | * Called after processing other sources of option data, this fills those | |
687 | * options for which no value has been specified with their default values. | |
688 | */ | |
8efc0c15 | 689 | |
6ae2364d | 690 | void |
5260325f | 691 | fill_default_options(Options * options) |
8efc0c15 | 692 | { |
5260325f | 693 | if (options->forward_agent == -1) |
694 | options->forward_agent = 1; | |
695 | if (options->forward_x11 == -1) | |
c8d54615 | 696 | options->forward_x11 = 0; |
5260325f | 697 | if (options->gateway_ports == -1) |
698 | options->gateway_ports = 0; | |
699 | if (options->use_privileged_port == -1) | |
700 | options->use_privileged_port = 1; | |
701 | if (options->rhosts_authentication == -1) | |
702 | options->rhosts_authentication = 1; | |
703 | if (options->rsa_authentication == -1) | |
704 | options->rsa_authentication = 1; | |
1d1ffb87 | 705 | if (options->dsa_authentication == -1) |
706 | options->dsa_authentication = 1; | |
5260325f | 707 | if (options->skey_authentication == -1) |
708 | options->skey_authentication = 0; | |
8efc0c15 | 709 | #ifdef KRB4 |
5260325f | 710 | if (options->kerberos_authentication == -1) |
711 | options->kerberos_authentication = 1; | |
8efc0c15 | 712 | #endif /* KRB4 */ |
713 | #ifdef AFS | |
5260325f | 714 | if (options->kerberos_tgt_passing == -1) |
715 | options->kerberos_tgt_passing = 1; | |
716 | if (options->afs_token_passing == -1) | |
717 | options->afs_token_passing = 1; | |
8efc0c15 | 718 | #endif /* AFS */ |
5260325f | 719 | if (options->password_authentication == -1) |
720 | options->password_authentication = 1; | |
721 | if (options->rhosts_rsa_authentication == -1) | |
722 | options->rhosts_rsa_authentication = 1; | |
723 | if (options->fallback_to_rsh == -1) | |
724 | options->fallback_to_rsh = 1; | |
725 | if (options->use_rsh == -1) | |
726 | options->use_rsh = 0; | |
727 | if (options->batch_mode == -1) | |
728 | options->batch_mode = 0; | |
729 | if (options->check_host_ip == -1) | |
730 | options->check_host_ip = 1; | |
731 | if (options->strict_host_key_checking == -1) | |
732 | options->strict_host_key_checking = 2; /* 2 is default */ | |
733 | if (options->compression == -1) | |
734 | options->compression = 0; | |
735 | if (options->keepalives == -1) | |
736 | options->keepalives = 1; | |
737 | if (options->compression_level == -1) | |
738 | options->compression_level = 6; | |
739 | if (options->port == -1) | |
740 | options->port = 0; /* Filled in ssh_connect. */ | |
741 | if (options->connection_attempts == -1) | |
742 | options->connection_attempts = 4; | |
743 | if (options->number_of_password_prompts == -1) | |
744 | options->number_of_password_prompts = 3; | |
745 | /* Selected in ssh_login(). */ | |
746 | if (options->cipher == -1) | |
747 | options->cipher = SSH_CIPHER_NOT_SET; | |
d0c832f3 | 748 | /* options->ciphers, default set in myproposals.h */ |
a8be9f80 | 749 | if (options->protocol == SSH_PROTO_UNKNOWN) |
a306f2dd | 750 | options->protocol = SSH_PROTO_1|SSH_PROTO_2|SSH_PROTO_1_PREFERRED; |
5260325f | 751 | if (options->num_identity_files == 0) { |
752 | options->identity_files[0] = | |
753 | xmalloc(2 + strlen(SSH_CLIENT_IDENTITY) + 1); | |
754 | sprintf(options->identity_files[0], "~/%.100s", SSH_CLIENT_IDENTITY); | |
755 | options->num_identity_files = 1; | |
756 | } | |
a306f2dd | 757 | if (options->num_identity_files2 == 0) { |
758 | options->identity_files2[0] = | |
1d1ffb87 | 759 | xmalloc(2 + strlen(SSH_CLIENT_ID_DSA) + 1); |
760 | sprintf(options->identity_files2[0], "~/%.100s", SSH_CLIENT_ID_DSA); | |
a306f2dd | 761 | options->num_identity_files2 = 1; |
762 | } | |
5260325f | 763 | if (options->escape_char == -1) |
764 | options->escape_char = '~'; | |
765 | if (options->system_hostfile == NULL) | |
766 | options->system_hostfile = SSH_SYSTEM_HOSTFILE; | |
767 | if (options->user_hostfile == NULL) | |
768 | options->user_hostfile = SSH_USER_HOSTFILE; | |
a306f2dd | 769 | if (options->system_hostfile2 == NULL) |
770 | options->system_hostfile2 = SSH_SYSTEM_HOSTFILE2; | |
771 | if (options->user_hostfile2 == NULL) | |
772 | options->user_hostfile2 = SSH_USER_HOSTFILE2; | |
5260325f | 773 | if (options->log_level == (LogLevel) - 1) |
774 | options->log_level = SYSLOG_LEVEL_INFO; | |
775 | /* options->proxy_command should not be set by default */ | |
776 | /* options->user will be set in the main program if appropriate */ | |
777 | /* options->hostname will be set in the main program if appropriate */ | |
8efc0c15 | 778 | } |