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8efc0c15 | 1 | /* |
5260325f | 2 | * Author: Tatu Ylonen <ylo@cs.hut.fi> |
5260325f | 3 | * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland |
4 | * All rights reserved | |
5260325f | 5 | * Functions for reading the configuration files. |
6ae2364d | 6 | * |
bcbf86ec | 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". | |
5260325f | 12 | */ |
8efc0c15 | 13 | |
14 | #include "includes.h" | |
c76c8819 | 15 | RCSID("$OpenBSD: readconf.c,v 1.60 2001/01/28 20:36:16 stevesk Exp $"); |
8efc0c15 | 16 | |
17 | #include "ssh.h" | |
8efc0c15 | 18 | #include "xmalloc.h" |
a8be9f80 | 19 | #include "compat.h" |
42f11eb2 | 20 | #include "cipher.h" |
21 | #include "pathnames.h" | |
22 | #include "log.h" | |
23 | #include "readconf.h" | |
24 | #include "match.h" | |
25 | #include "misc.h" | |
8efc0c15 | 26 | |
27 | /* Format of the configuration file: | |
28 | ||
29 | # Configuration data is parsed as follows: | |
30 | # 1. command line options | |
31 | # 2. user-specific file | |
32 | # 3. system-wide file | |
33 | # Any configuration value is only changed the first time it is set. | |
34 | # Thus, host-specific definitions should be at the beginning of the | |
35 | # configuration file, and defaults at the end. | |
36 | ||
37 | # Host-specific declarations. These may override anything above. A single | |
38 | # host may match multiple declarations; these are processed in the order | |
39 | # that they are given in. | |
40 | ||
41 | Host *.ngs.fi ngs.fi | |
42 | FallBackToRsh no | |
43 | ||
44 | Host fake.com | |
45 | HostName another.host.name.real.org | |
46 | User blaah | |
47 | Port 34289 | |
48 | ForwardX11 no | |
49 | ForwardAgent no | |
50 | ||
51 | Host books.com | |
52 | RemoteForward 9999 shadows.cs.hut.fi:9999 | |
53 | Cipher 3des | |
54 | ||
55 | Host fascist.blob.com | |
56 | Port 23123 | |
57 | User tylonen | |
58 | RhostsAuthentication no | |
59 | PasswordAuthentication no | |
60 | ||
61 | Host puukko.hut.fi | |
62 | User t35124p | |
63 | ProxyCommand ssh-proxy %h %p | |
64 | ||
65 | Host *.fr | |
66 | UseRsh yes | |
67 | ||
68 | Host *.su | |
69 | Cipher none | |
70 | PasswordAuthentication no | |
71 | ||
72 | # Defaults for various options | |
73 | Host * | |
74 | ForwardAgent no | |
fa08c86b | 75 | ForwardX11 no |
8efc0c15 | 76 | RhostsAuthentication yes |
77 | PasswordAuthentication yes | |
78 | RSAAuthentication yes | |
79 | RhostsRSAAuthentication yes | |
80 | FallBackToRsh no | |
81 | UseRsh no | |
82 | StrictHostKeyChecking yes | |
83 | KeepAlives no | |
84 | IdentityFile ~/.ssh/identity | |
85 | Port 22 | |
86 | EscapeChar ~ | |
87 | ||
88 | */ | |
89 | ||
90 | /* Keyword tokens. */ | |
91 | ||
5260325f | 92 | typedef enum { |
93 | oBadOption, | |
94 | oForwardAgent, oForwardX11, oGatewayPorts, oRhostsAuthentication, | |
95 | oPasswordAuthentication, oRSAAuthentication, oFallBackToRsh, oUseRsh, | |
d464095c | 96 | oChallengeResponseAuthentication, oXAuthLocation, |
8efc0c15 | 97 | #ifdef KRB4 |
5260325f | 98 | oKerberosAuthentication, |
8efc0c15 | 99 | #endif /* KRB4 */ |
100 | #ifdef AFS | |
5260325f | 101 | oKerberosTgtPassing, oAFSTokenPassing, |
8efc0c15 | 102 | #endif |
5260325f | 103 | oIdentityFile, oHostName, oPort, oCipher, oRemoteForward, oLocalForward, |
104 | oUser, oHost, oEscapeChar, oRhostsRSAAuthentication, oProxyCommand, | |
105 | oGlobalKnownHostsFile, oUserKnownHostsFile, oConnectionAttempts, | |
106 | oBatchMode, oCheckHostIP, oStrictHostKeyChecking, oCompression, | |
d464095c | 107 | oCompressionLevel, oKeepAlives, oNumberOfPasswordPrompts, |
fa08c86b | 108 | oUsePrivilegedPort, oLogLevel, oCiphers, oProtocol, |
109 | oGlobalKnownHostsFile2, oUserKnownHostsFile2, oPubkeyAuthentication, | |
8abcdba4 | 110 | oKbdInteractiveAuthentication, oKbdInteractiveDevices, oHostKeyAlias |
8efc0c15 | 111 | } OpCodes; |
112 | ||
113 | /* Textual representations of the tokens. */ | |
114 | ||
5260325f | 115 | static struct { |
116 | const char *name; | |
117 | OpCodes opcode; | |
118 | } keywords[] = { | |
119 | { "forwardagent", oForwardAgent }, | |
120 | { "forwardx11", oForwardX11 }, | |
fa649821 | 121 | { "xauthlocation", oXAuthLocation }, |
5260325f | 122 | { "gatewayports", oGatewayPorts }, |
123 | { "useprivilegedport", oUsePrivilegedPort }, | |
124 | { "rhostsauthentication", oRhostsAuthentication }, | |
125 | { "passwordauthentication", oPasswordAuthentication }, | |
94ec8c6b | 126 | { "kbdinteractiveauthentication", oKbdInteractiveAuthentication }, |
127 | { "kbdinteractivedevices", oKbdInteractiveDevices }, | |
5260325f | 128 | { "rsaauthentication", oRSAAuthentication }, |
fa08c86b | 129 | { "pubkeyauthentication", oPubkeyAuthentication }, |
d464095c | 130 | { "dsaauthentication", oPubkeyAuthentication }, /* alias */ |
131 | { "challengeresponseauthentication", oChallengeResponseAuthentication }, | |
132 | { "skeyauthentication", oChallengeResponseAuthentication }, /* alias */ | |
133 | { "tisauthentication", oChallengeResponseAuthentication }, /* alias */ | |
8efc0c15 | 134 | #ifdef KRB4 |
5260325f | 135 | { "kerberosauthentication", oKerberosAuthentication }, |
8efc0c15 | 136 | #endif /* KRB4 */ |
137 | #ifdef AFS | |
5260325f | 138 | { "kerberostgtpassing", oKerberosTgtPassing }, |
139 | { "afstokenpassing", oAFSTokenPassing }, | |
8efc0c15 | 140 | #endif |
5260325f | 141 | { "fallbacktorsh", oFallBackToRsh }, |
142 | { "usersh", oUseRsh }, | |
143 | { "identityfile", oIdentityFile }, | |
fa08c86b | 144 | { "identityfile2", oIdentityFile }, /* alias */ |
5260325f | 145 | { "hostname", oHostName }, |
8abcdba4 | 146 | { "hostkeyalias", oHostKeyAlias }, |
5260325f | 147 | { "proxycommand", oProxyCommand }, |
148 | { "port", oPort }, | |
149 | { "cipher", oCipher }, | |
a8be9f80 | 150 | { "ciphers", oCiphers }, |
151 | { "protocol", oProtocol }, | |
5260325f | 152 | { "remoteforward", oRemoteForward }, |
153 | { "localforward", oLocalForward }, | |
154 | { "user", oUser }, | |
155 | { "host", oHost }, | |
156 | { "escapechar", oEscapeChar }, | |
157 | { "rhostsrsaauthentication", oRhostsRSAAuthentication }, | |
158 | { "globalknownhostsfile", oGlobalKnownHostsFile }, | |
159 | { "userknownhostsfile", oUserKnownHostsFile }, | |
a306f2dd | 160 | { "globalknownhostsfile2", oGlobalKnownHostsFile2 }, |
161 | { "userknownhostsfile2", oUserKnownHostsFile2 }, | |
5260325f | 162 | { "connectionattempts", oConnectionAttempts }, |
163 | { "batchmode", oBatchMode }, | |
164 | { "checkhostip", oCheckHostIP }, | |
165 | { "stricthostkeychecking", oStrictHostKeyChecking }, | |
166 | { "compression", oCompression }, | |
167 | { "compressionlevel", oCompressionLevel }, | |
168 | { "keepalive", oKeepAlives }, | |
169 | { "numberofpasswordprompts", oNumberOfPasswordPrompts }, | |
5260325f | 170 | { "loglevel", oLogLevel }, |
171 | { NULL, 0 } | |
6a17f9c2 | 172 | }; |
173 | ||
aa3378df | 174 | /* |
175 | * Adds a local TCP/IP port forward to options. Never returns if there is an | |
176 | * error. | |
177 | */ | |
8efc0c15 | 178 | |
6ae2364d | 179 | void |
57112b5a | 180 | add_local_forward(Options *options, u_short port, const char *host, |
181 | u_short host_port) | |
8efc0c15 | 182 | { |
5260325f | 183 | Forward *fwd; |
3c62e7eb | 184 | #ifndef HAVE_CYGWIN |
5260325f | 185 | extern uid_t original_real_uid; |
5260325f | 186 | if (port < IPPORT_RESERVED && original_real_uid != 0) |
187 | fatal("Privileged ports can only be forwarded by root.\n"); | |
3c62e7eb | 188 | #endif |
5260325f | 189 | if (options->num_local_forwards >= SSH_MAX_FORWARDS_PER_DIRECTION) |
190 | fatal("Too many local forwards (max %d).", SSH_MAX_FORWARDS_PER_DIRECTION); | |
191 | fwd = &options->local_forwards[options->num_local_forwards++]; | |
192 | fwd->port = port; | |
193 | fwd->host = xstrdup(host); | |
194 | fwd->host_port = host_port; | |
8efc0c15 | 195 | } |
196 | ||
aa3378df | 197 | /* |
198 | * Adds a remote TCP/IP port forward to options. Never returns if there is | |
199 | * an error. | |
200 | */ | |
8efc0c15 | 201 | |
6ae2364d | 202 | void |
57112b5a | 203 | add_remote_forward(Options *options, u_short port, const char *host, |
204 | u_short host_port) | |
8efc0c15 | 205 | { |
5260325f | 206 | Forward *fwd; |
207 | if (options->num_remote_forwards >= SSH_MAX_FORWARDS_PER_DIRECTION) | |
208 | fatal("Too many remote forwards (max %d).", | |
209 | SSH_MAX_FORWARDS_PER_DIRECTION); | |
210 | fwd = &options->remote_forwards[options->num_remote_forwards++]; | |
211 | fwd->port = port; | |
212 | fwd->host = xstrdup(host); | |
213 | fwd->host_port = host_port; | |
8efc0c15 | 214 | } |
215 | ||
aa3378df | 216 | /* |
217 | * Returns the number of the token pointed to by cp of length len. Never | |
218 | * returns if the token is not known. | |
219 | */ | |
8efc0c15 | 220 | |
6ae2364d | 221 | static OpCodes |
5260325f | 222 | parse_token(const char *cp, const char *filename, int linenum) |
8efc0c15 | 223 | { |
1e3b8b07 | 224 | u_int i; |
8efc0c15 | 225 | |
5260325f | 226 | for (i = 0; keywords[i].name; i++) |
aa3378df | 227 | if (strcasecmp(cp, keywords[i].name) == 0) |
5260325f | 228 | return keywords[i].opcode; |
8efc0c15 | 229 | |
5260325f | 230 | fprintf(stderr, "%s: line %d: Bad configuration option: %s\n", |
231 | filename, linenum, cp); | |
232 | return oBadOption; | |
8efc0c15 | 233 | } |
234 | ||
aa3378df | 235 | /* |
236 | * Processes a single option line as used in the configuration files. This | |
237 | * only sets those values that have not already been set. | |
238 | */ | |
8efc0c15 | 239 | |
e7c0f9d5 | 240 | int |
241 | process_config_line(Options *options, const char *host, | |
5260325f | 242 | char *line, const char *filename, int linenum, |
243 | int *activep) | |
8efc0c15 | 244 | { |
089fbbd2 | 245 | char buf[256], *s, *string, **charptr, *endofnumber, *keyword, *arg; |
57112b5a | 246 | int opcode, *intptr, value; |
247 | u_short fwd_port, fwd_host_port; | |
5260325f | 248 | |
704b1659 | 249 | s = line; |
250 | /* Get the keyword. (Each line is supposed to begin with a keyword). */ | |
251 | keyword = strdelim(&s); | |
252 | /* Ignore leading whitespace. */ | |
253 | if (*keyword == '\0') | |
254 | keyword = strdelim(&s); | |
42f11eb2 | 255 | if (keyword == NULL || !*keyword || *keyword == '\n' || *keyword == '#') |
5260325f | 256 | return 0; |
257 | ||
089fbbd2 | 258 | opcode = parse_token(keyword, filename, linenum); |
5260325f | 259 | |
260 | switch (opcode) { | |
261 | case oBadOption: | |
aa3378df | 262 | /* don't panic, but count bad options */ |
263 | return -1; | |
5260325f | 264 | /* NOTREACHED */ |
265 | case oForwardAgent: | |
266 | intptr = &options->forward_agent; | |
267 | parse_flag: | |
704b1659 | 268 | arg = strdelim(&s); |
089fbbd2 | 269 | if (!arg || *arg == '\0') |
5260325f | 270 | fatal("%.200s line %d: Missing yes/no argument.", filename, linenum); |
271 | value = 0; /* To avoid compiler warning... */ | |
089fbbd2 | 272 | if (strcmp(arg, "yes") == 0 || strcmp(arg, "true") == 0) |
5260325f | 273 | value = 1; |
089fbbd2 | 274 | else if (strcmp(arg, "no") == 0 || strcmp(arg, "false") == 0) |
5260325f | 275 | value = 0; |
276 | else | |
277 | fatal("%.200s line %d: Bad yes/no argument.", filename, linenum); | |
278 | if (*activep && *intptr == -1) | |
279 | *intptr = value; | |
280 | break; | |
281 | ||
282 | case oForwardX11: | |
283 | intptr = &options->forward_x11; | |
284 | goto parse_flag; | |
285 | ||
286 | case oGatewayPorts: | |
287 | intptr = &options->gateway_ports; | |
288 | goto parse_flag; | |
289 | ||
290 | case oUsePrivilegedPort: | |
291 | intptr = &options->use_privileged_port; | |
292 | goto parse_flag; | |
293 | ||
294 | case oRhostsAuthentication: | |
295 | intptr = &options->rhosts_authentication; | |
296 | goto parse_flag; | |
297 | ||
298 | case oPasswordAuthentication: | |
299 | intptr = &options->password_authentication; | |
300 | goto parse_flag; | |
301 | ||
94ec8c6b | 302 | case oKbdInteractiveAuthentication: |
303 | intptr = &options->kbd_interactive_authentication; | |
304 | goto parse_flag; | |
305 | ||
306 | case oKbdInteractiveDevices: | |
307 | charptr = &options->kbd_interactive_devices; | |
308 | goto parse_string; | |
309 | ||
fa08c86b | 310 | case oPubkeyAuthentication: |
311 | intptr = &options->pubkey_authentication; | |
1d1ffb87 | 312 | goto parse_flag; |
313 | ||
5260325f | 314 | case oRSAAuthentication: |
315 | intptr = &options->rsa_authentication; | |
316 | goto parse_flag; | |
317 | ||
318 | case oRhostsRSAAuthentication: | |
319 | intptr = &options->rhosts_rsa_authentication; | |
320 | goto parse_flag; | |
321 | ||
d464095c | 322 | case oChallengeResponseAuthentication: |
323 | intptr = &options->challenge_reponse_authentication; | |
5260325f | 324 | goto parse_flag; |
8efc0c15 | 325 | |
326 | #ifdef KRB4 | |
5260325f | 327 | case oKerberosAuthentication: |
328 | intptr = &options->kerberos_authentication; | |
329 | goto parse_flag; | |
8efc0c15 | 330 | #endif /* KRB4 */ |
331 | ||
332 | #ifdef AFS | |
5260325f | 333 | case oKerberosTgtPassing: |
334 | intptr = &options->kerberos_tgt_passing; | |
335 | goto parse_flag; | |
8efc0c15 | 336 | |
5260325f | 337 | case oAFSTokenPassing: |
338 | intptr = &options->afs_token_passing; | |
339 | goto parse_flag; | |
8efc0c15 | 340 | #endif |
5260325f | 341 | |
342 | case oFallBackToRsh: | |
343 | intptr = &options->fallback_to_rsh; | |
344 | goto parse_flag; | |
345 | ||
346 | case oUseRsh: | |
347 | intptr = &options->use_rsh; | |
348 | goto parse_flag; | |
349 | ||
350 | case oBatchMode: | |
351 | intptr = &options->batch_mode; | |
352 | goto parse_flag; | |
353 | ||
354 | case oCheckHostIP: | |
355 | intptr = &options->check_host_ip; | |
356 | goto parse_flag; | |
357 | ||
358 | case oStrictHostKeyChecking: | |
359 | intptr = &options->strict_host_key_checking; | |
704b1659 | 360 | arg = strdelim(&s); |
089fbbd2 | 361 | if (!arg || *arg == '\0') |
c76c8819 | 362 | fatal("%.200s line %d: Missing yes/no/ask argument.", |
5260325f | 363 | filename, linenum); |
364 | value = 0; /* To avoid compiler warning... */ | |
089fbbd2 | 365 | if (strcmp(arg, "yes") == 0 || strcmp(arg, "true") == 0) |
5260325f | 366 | value = 1; |
089fbbd2 | 367 | else if (strcmp(arg, "no") == 0 || strcmp(arg, "false") == 0) |
5260325f | 368 | value = 0; |
089fbbd2 | 369 | else if (strcmp(arg, "ask") == 0) |
5260325f | 370 | value = 2; |
371 | else | |
372 | fatal("%.200s line %d: Bad yes/no/ask argument.", filename, linenum); | |
373 | if (*activep && *intptr == -1) | |
374 | *intptr = value; | |
375 | break; | |
376 | ||
377 | case oCompression: | |
378 | intptr = &options->compression; | |
379 | goto parse_flag; | |
380 | ||
381 | case oKeepAlives: | |
382 | intptr = &options->keepalives; | |
383 | goto parse_flag; | |
384 | ||
385 | case oNumberOfPasswordPrompts: | |
386 | intptr = &options->number_of_password_prompts; | |
387 | goto parse_int; | |
388 | ||
389 | case oCompressionLevel: | |
390 | intptr = &options->compression_level; | |
391 | goto parse_int; | |
392 | ||
393 | case oIdentityFile: | |
704b1659 | 394 | arg = strdelim(&s); |
089fbbd2 | 395 | if (!arg || *arg == '\0') |
5260325f | 396 | fatal("%.200s line %d: Missing argument.", filename, linenum); |
397 | if (*activep) { | |
fa08c86b | 398 | intptr = &options->num_identity_files; |
a306f2dd | 399 | if (*intptr >= SSH_MAX_IDENTITY_FILES) |
5260325f | 400 | fatal("%.200s line %d: Too many identity files specified (max %d).", |
401 | filename, linenum, SSH_MAX_IDENTITY_FILES); | |
fa08c86b | 402 | charptr = &options->identity_files[*intptr]; |
089fbbd2 | 403 | *charptr = xstrdup(arg); |
a306f2dd | 404 | *intptr = *intptr + 1; |
5260325f | 405 | } |
406 | break; | |
407 | ||
fa649821 | 408 | case oXAuthLocation: |
409 | charptr=&options->xauth_location; | |
410 | goto parse_string; | |
411 | ||
5260325f | 412 | case oUser: |
413 | charptr = &options->user; | |
414 | parse_string: | |
704b1659 | 415 | arg = strdelim(&s); |
089fbbd2 | 416 | if (!arg || *arg == '\0') |
5260325f | 417 | fatal("%.200s line %d: Missing argument.", filename, linenum); |
418 | if (*activep && *charptr == NULL) | |
089fbbd2 | 419 | *charptr = xstrdup(arg); |
5260325f | 420 | break; |
421 | ||
422 | case oGlobalKnownHostsFile: | |
423 | charptr = &options->system_hostfile; | |
424 | goto parse_string; | |
425 | ||
426 | case oUserKnownHostsFile: | |
427 | charptr = &options->user_hostfile; | |
428 | goto parse_string; | |
429 | ||
a306f2dd | 430 | case oGlobalKnownHostsFile2: |
431 | charptr = &options->system_hostfile2; | |
432 | goto parse_string; | |
433 | ||
434 | case oUserKnownHostsFile2: | |
435 | charptr = &options->user_hostfile2; | |
436 | goto parse_string; | |
437 | ||
5260325f | 438 | case oHostName: |
439 | charptr = &options->hostname; | |
440 | goto parse_string; | |
441 | ||
8abcdba4 | 442 | case oHostKeyAlias: |
443 | charptr = &options->host_key_alias; | |
444 | goto parse_string; | |
445 | ||
5260325f | 446 | case oProxyCommand: |
447 | charptr = &options->proxy_command; | |
448 | string = xstrdup(""); | |
704b1659 | 449 | while ((arg = strdelim(&s)) != NULL && *arg != '\0') { |
089fbbd2 | 450 | string = xrealloc(string, strlen(string) + strlen(arg) + 2); |
5260325f | 451 | strcat(string, " "); |
089fbbd2 | 452 | strcat(string, arg); |
5260325f | 453 | } |
454 | if (*activep && *charptr == NULL) | |
455 | *charptr = string; | |
456 | else | |
457 | xfree(string); | |
458 | return 0; | |
459 | ||
460 | case oPort: | |
461 | intptr = &options->port; | |
462 | parse_int: | |
704b1659 | 463 | arg = strdelim(&s); |
089fbbd2 | 464 | if (!arg || *arg == '\0') |
5260325f | 465 | fatal("%.200s line %d: Missing argument.", filename, linenum); |
089fbbd2 | 466 | if (arg[0] < '0' || arg[0] > '9') |
5260325f | 467 | fatal("%.200s line %d: Bad number.", filename, linenum); |
aa3378df | 468 | |
469 | /* Octal, decimal, or hex format? */ | |
089fbbd2 | 470 | value = strtol(arg, &endofnumber, 0); |
471 | if (arg == endofnumber) | |
aa3378df | 472 | fatal("%.200s line %d: Bad number.", filename, linenum); |
5260325f | 473 | if (*activep && *intptr == -1) |
474 | *intptr = value; | |
475 | break; | |
476 | ||
477 | case oConnectionAttempts: | |
478 | intptr = &options->connection_attempts; | |
479 | goto parse_int; | |
480 | ||
481 | case oCipher: | |
482 | intptr = &options->cipher; | |
704b1659 | 483 | arg = strdelim(&s); |
089fbbd2 | 484 | if (!arg || *arg == '\0') |
71276795 | 485 | fatal("%.200s line %d: Missing argument.", filename, linenum); |
089fbbd2 | 486 | value = cipher_number(arg); |
5260325f | 487 | if (value == -1) |
488 | fatal("%.200s line %d: Bad cipher '%s'.", | |
089fbbd2 | 489 | filename, linenum, arg ? arg : "<NONE>"); |
5260325f | 490 | if (*activep && *intptr == -1) |
491 | *intptr = value; | |
492 | break; | |
493 | ||
a8be9f80 | 494 | case oCiphers: |
704b1659 | 495 | arg = strdelim(&s); |
089fbbd2 | 496 | if (!arg || *arg == '\0') |
71276795 | 497 | fatal("%.200s line %d: Missing argument.", filename, linenum); |
089fbbd2 | 498 | if (!ciphers_valid(arg)) |
d0c832f3 | 499 | fatal("%.200s line %d: Bad SSH2 cipher spec '%s'.", |
089fbbd2 | 500 | filename, linenum, arg ? arg : "<NONE>"); |
a8be9f80 | 501 | if (*activep && options->ciphers == NULL) |
089fbbd2 | 502 | options->ciphers = xstrdup(arg); |
a8be9f80 | 503 | break; |
504 | ||
505 | case oProtocol: | |
506 | intptr = &options->protocol; | |
704b1659 | 507 | arg = strdelim(&s); |
089fbbd2 | 508 | if (!arg || *arg == '\0') |
71276795 | 509 | fatal("%.200s line %d: Missing argument.", filename, linenum); |
089fbbd2 | 510 | value = proto_spec(arg); |
a8be9f80 | 511 | if (value == SSH_PROTO_UNKNOWN) |
512 | fatal("%.200s line %d: Bad protocol spec '%s'.", | |
089fbbd2 | 513 | filename, linenum, arg ? arg : "<NONE>"); |
a8be9f80 | 514 | if (*activep && *intptr == SSH_PROTO_UNKNOWN) |
515 | *intptr = value; | |
516 | break; | |
517 | ||
5260325f | 518 | case oLogLevel: |
519 | intptr = (int *) &options->log_level; | |
704b1659 | 520 | arg = strdelim(&s); |
089fbbd2 | 521 | value = log_level_number(arg); |
5260325f | 522 | if (value == (LogLevel) - 1) |
523 | fatal("%.200s line %d: unsupported log level '%s'\n", | |
089fbbd2 | 524 | filename, linenum, arg ? arg : "<NONE>"); |
5260325f | 525 | if (*activep && (LogLevel) * intptr == -1) |
526 | *intptr = (LogLevel) value; | |
527 | break; | |
528 | ||
529 | case oRemoteForward: | |
704b1659 | 530 | arg = strdelim(&s); |
089fbbd2 | 531 | if (!arg || *arg == '\0') |
5260325f | 532 | fatal("%.200s line %d: Missing argument.", filename, linenum); |
089fbbd2 | 533 | if (arg[0] < '0' || arg[0] > '9') |
5260325f | 534 | fatal("%.200s line %d: Badly formatted port number.", |
535 | filename, linenum); | |
089fbbd2 | 536 | fwd_port = atoi(arg); |
704b1659 | 537 | arg = strdelim(&s); |
089fbbd2 | 538 | if (!arg || *arg == '\0') |
5260325f | 539 | fatal("%.200s line %d: Missing second argument.", |
540 | filename, linenum); | |
089fbbd2 | 541 | if (sscanf(arg, "%255[^:]:%hu", buf, &fwd_host_port) != 2) |
5260325f | 542 | fatal("%.200s line %d: Badly formatted host:port.", |
543 | filename, linenum); | |
544 | if (*activep) | |
545 | add_remote_forward(options, fwd_port, buf, fwd_host_port); | |
546 | break; | |
547 | ||
548 | case oLocalForward: | |
704b1659 | 549 | arg = strdelim(&s); |
089fbbd2 | 550 | if (!arg || *arg == '\0') |
5260325f | 551 | fatal("%.200s line %d: Missing argument.", filename, linenum); |
089fbbd2 | 552 | if (arg[0] < '0' || arg[0] > '9') |
5260325f | 553 | fatal("%.200s line %d: Badly formatted port number.", |
554 | filename, linenum); | |
089fbbd2 | 555 | fwd_port = atoi(arg); |
704b1659 | 556 | arg = strdelim(&s); |
089fbbd2 | 557 | if (!arg || *arg == '\0') |
5260325f | 558 | fatal("%.200s line %d: Missing second argument.", |
559 | filename, linenum); | |
089fbbd2 | 560 | if (sscanf(arg, "%255[^:]:%hu", buf, &fwd_host_port) != 2) |
5260325f | 561 | fatal("%.200s line %d: Badly formatted host:port.", |
562 | filename, linenum); | |
563 | if (*activep) | |
564 | add_local_forward(options, fwd_port, buf, fwd_host_port); | |
565 | break; | |
566 | ||
567 | case oHost: | |
568 | *activep = 0; | |
704b1659 | 569 | while ((arg = strdelim(&s)) != NULL && *arg != '\0') |
089fbbd2 | 570 | if (match_pattern(host, arg)) { |
571 | debug("Applying options for %.100s", arg); | |
5260325f | 572 | *activep = 1; |
573 | break; | |
574 | } | |
704b1659 | 575 | /* Avoid garbage check below, as strdelim is done. */ |
5260325f | 576 | return 0; |
577 | ||
578 | case oEscapeChar: | |
579 | intptr = &options->escape_char; | |
704b1659 | 580 | arg = strdelim(&s); |
089fbbd2 | 581 | if (!arg || *arg == '\0') |
5260325f | 582 | fatal("%.200s line %d: Missing argument.", filename, linenum); |
089fbbd2 | 583 | if (arg[0] == '^' && arg[2] == 0 && |
1e3b8b07 | 584 | (u_char) arg[1] >= 64 && (u_char) arg[1] < 128) |
585 | value = (u_char) arg[1] & 31; | |
089fbbd2 | 586 | else if (strlen(arg) == 1) |
1e3b8b07 | 587 | value = (u_char) arg[0]; |
089fbbd2 | 588 | else if (strcmp(arg, "none") == 0) |
5260325f | 589 | value = -2; |
590 | else { | |
591 | fatal("%.200s line %d: Bad escape character.", | |
592 | filename, linenum); | |
593 | /* NOTREACHED */ | |
594 | value = 0; /* Avoid compiler warning. */ | |
595 | } | |
596 | if (*activep && *intptr == -1) | |
597 | *intptr = value; | |
598 | break; | |
599 | ||
600 | default: | |
601 | fatal("process_config_line: Unimplemented opcode %d", opcode); | |
602 | } | |
603 | ||
604 | /* Check that there is no garbage at end of line. */ | |
42f11eb2 | 605 | if ((arg = strdelim(&s)) != NULL && *arg != '\0') { |
089fbbd2 | 606 | fatal("%.200s line %d: garbage at end of line; \"%.200s\".", |
607 | filename, linenum, arg); | |
608 | } | |
5260325f | 609 | return 0; |
8efc0c15 | 610 | } |
611 | ||
612 | ||
aa3378df | 613 | /* |
614 | * Reads the config file and modifies the options accordingly. Options | |
615 | * should already be initialized before this call. This never returns if | |
616 | * there is an error. If the file does not exist, this returns immediately. | |
617 | */ | |
8efc0c15 | 618 | |
6ae2364d | 619 | void |
5260325f | 620 | read_config_file(const char *filename, const char *host, Options *options) |
8efc0c15 | 621 | { |
5260325f | 622 | FILE *f; |
623 | char line[1024]; | |
624 | int active, linenum; | |
625 | int bad_options = 0; | |
626 | ||
627 | /* Open the file. */ | |
628 | f = fopen(filename, "r"); | |
629 | if (!f) | |
630 | return; | |
631 | ||
632 | debug("Reading configuration data %.200s", filename); | |
633 | ||
aa3378df | 634 | /* |
635 | * Mark that we are now processing the options. This flag is turned | |
636 | * on/off by Host specifications. | |
637 | */ | |
5260325f | 638 | active = 1; |
639 | linenum = 0; | |
640 | while (fgets(line, sizeof(line), f)) { | |
641 | /* Update line number counter. */ | |
642 | linenum++; | |
643 | if (process_config_line(options, host, line, filename, linenum, &active) != 0) | |
644 | bad_options++; | |
645 | } | |
646 | fclose(f); | |
647 | if (bad_options > 0) | |
648 | fatal("%s: terminating, %d bad configuration options\n", | |
649 | filename, bad_options); | |
8efc0c15 | 650 | } |
651 | ||
aa3378df | 652 | /* |
653 | * Initializes options to special values that indicate that they have not yet | |
654 | * been set. Read_config_file will only set options with this value. Options | |
655 | * are processed in the following order: command line, user config file, | |
656 | * system config file. Last, fill_default_options is called. | |
657 | */ | |
8efc0c15 | 658 | |
6ae2364d | 659 | void |
5260325f | 660 | initialize_options(Options * options) |
8efc0c15 | 661 | { |
5260325f | 662 | memset(options, 'X', sizeof(*options)); |
663 | options->forward_agent = -1; | |
664 | options->forward_x11 = -1; | |
fa649821 | 665 | options->xauth_location = NULL; |
5260325f | 666 | options->gateway_ports = -1; |
667 | options->use_privileged_port = -1; | |
668 | options->rhosts_authentication = -1; | |
669 | options->rsa_authentication = -1; | |
fa08c86b | 670 | options->pubkey_authentication = -1; |
d464095c | 671 | options->challenge_reponse_authentication = -1; |
8efc0c15 | 672 | #ifdef KRB4 |
5260325f | 673 | options->kerberos_authentication = -1; |
8efc0c15 | 674 | #endif |
675 | #ifdef AFS | |
5260325f | 676 | options->kerberos_tgt_passing = -1; |
677 | options->afs_token_passing = -1; | |
8efc0c15 | 678 | #endif |
5260325f | 679 | options->password_authentication = -1; |
94ec8c6b | 680 | options->kbd_interactive_authentication = -1; |
681 | options->kbd_interactive_devices = NULL; | |
5260325f | 682 | options->rhosts_rsa_authentication = -1; |
683 | options->fallback_to_rsh = -1; | |
684 | options->use_rsh = -1; | |
685 | options->batch_mode = -1; | |
686 | options->check_host_ip = -1; | |
687 | options->strict_host_key_checking = -1; | |
688 | options->compression = -1; | |
689 | options->keepalives = -1; | |
690 | options->compression_level = -1; | |
691 | options->port = -1; | |
692 | options->connection_attempts = -1; | |
693 | options->number_of_password_prompts = -1; | |
694 | options->cipher = -1; | |
a8be9f80 | 695 | options->ciphers = NULL; |
696 | options->protocol = SSH_PROTO_UNKNOWN; | |
5260325f | 697 | options->num_identity_files = 0; |
698 | options->hostname = NULL; | |
8abcdba4 | 699 | options->host_key_alias = NULL; |
5260325f | 700 | options->proxy_command = NULL; |
701 | options->user = NULL; | |
702 | options->escape_char = -1; | |
703 | options->system_hostfile = NULL; | |
704 | options->user_hostfile = NULL; | |
a306f2dd | 705 | options->system_hostfile2 = NULL; |
706 | options->user_hostfile2 = NULL; | |
5260325f | 707 | options->num_local_forwards = 0; |
708 | options->num_remote_forwards = 0; | |
709 | options->log_level = (LogLevel) - 1; | |
8efc0c15 | 710 | } |
711 | ||
aa3378df | 712 | /* |
713 | * Called after processing other sources of option data, this fills those | |
714 | * options for which no value has been specified with their default values. | |
715 | */ | |
8efc0c15 | 716 | |
6ae2364d | 717 | void |
5260325f | 718 | fill_default_options(Options * options) |
8efc0c15 | 719 | { |
5260325f | 720 | if (options->forward_agent == -1) |
71276795 | 721 | options->forward_agent = 0; |
5260325f | 722 | if (options->forward_x11 == -1) |
c8d54615 | 723 | options->forward_x11 = 0; |
fa649821 | 724 | #ifdef XAUTH_PATH |
725 | if (options->xauth_location == NULL) | |
726 | options->xauth_location = XAUTH_PATH; | |
727 | #endif /* XAUTH_PATH */ | |
5260325f | 728 | if (options->gateway_ports == -1) |
729 | options->gateway_ports = 0; | |
730 | if (options->use_privileged_port == -1) | |
731 | options->use_privileged_port = 1; | |
732 | if (options->rhosts_authentication == -1) | |
733 | options->rhosts_authentication = 1; | |
734 | if (options->rsa_authentication == -1) | |
735 | options->rsa_authentication = 1; | |
fa08c86b | 736 | if (options->pubkey_authentication == -1) |
737 | options->pubkey_authentication = 1; | |
d464095c | 738 | if (options->challenge_reponse_authentication == -1) |
739 | options->challenge_reponse_authentication = 0; | |
8efc0c15 | 740 | #ifdef KRB4 |
5260325f | 741 | if (options->kerberos_authentication == -1) |
742 | options->kerberos_authentication = 1; | |
8efc0c15 | 743 | #endif /* KRB4 */ |
744 | #ifdef AFS | |
5260325f | 745 | if (options->kerberos_tgt_passing == -1) |
746 | options->kerberos_tgt_passing = 1; | |
747 | if (options->afs_token_passing == -1) | |
748 | options->afs_token_passing = 1; | |
8efc0c15 | 749 | #endif /* AFS */ |
5260325f | 750 | if (options->password_authentication == -1) |
751 | options->password_authentication = 1; | |
94ec8c6b | 752 | if (options->kbd_interactive_authentication == -1) |
d464095c | 753 | options->kbd_interactive_authentication = 1; |
5260325f | 754 | if (options->rhosts_rsa_authentication == -1) |
755 | options->rhosts_rsa_authentication = 1; | |
756 | if (options->fallback_to_rsh == -1) | |
3f7a7e4a | 757 | options->fallback_to_rsh = 0; |
5260325f | 758 | if (options->use_rsh == -1) |
759 | options->use_rsh = 0; | |
760 | if (options->batch_mode == -1) | |
761 | options->batch_mode = 0; | |
762 | if (options->check_host_ip == -1) | |
763 | options->check_host_ip = 1; | |
764 | if (options->strict_host_key_checking == -1) | |
765 | options->strict_host_key_checking = 2; /* 2 is default */ | |
766 | if (options->compression == -1) | |
767 | options->compression = 0; | |
768 | if (options->keepalives == -1) | |
769 | options->keepalives = 1; | |
770 | if (options->compression_level == -1) | |
771 | options->compression_level = 6; | |
772 | if (options->port == -1) | |
773 | options->port = 0; /* Filled in ssh_connect. */ | |
774 | if (options->connection_attempts == -1) | |
775 | options->connection_attempts = 4; | |
776 | if (options->number_of_password_prompts == -1) | |
777 | options->number_of_password_prompts = 3; | |
778 | /* Selected in ssh_login(). */ | |
779 | if (options->cipher == -1) | |
780 | options->cipher = SSH_CIPHER_NOT_SET; | |
d0c832f3 | 781 | /* options->ciphers, default set in myproposals.h */ |
a8be9f80 | 782 | if (options->protocol == SSH_PROTO_UNKNOWN) |
a306f2dd | 783 | options->protocol = SSH_PROTO_1|SSH_PROTO_2|SSH_PROTO_1_PREFERRED; |
5260325f | 784 | if (options->num_identity_files == 0) { |
fa08c86b | 785 | if (options->protocol & SSH_PROTO_1) { |
786 | options->identity_files[options->num_identity_files] = | |
42f11eb2 | 787 | xmalloc(2 + strlen(_PATH_SSH_CLIENT_IDENTITY) + 1); |
fa08c86b | 788 | sprintf(options->identity_files[options->num_identity_files++], |
42f11eb2 | 789 | "~/%.100s", _PATH_SSH_CLIENT_IDENTITY); |
fa08c86b | 790 | } |
791 | if (options->protocol & SSH_PROTO_2) { | |
792 | options->identity_files[options->num_identity_files] = | |
42f11eb2 | 793 | xmalloc(2 + strlen(_PATH_SSH_CLIENT_ID_DSA) + 1); |
fa08c86b | 794 | sprintf(options->identity_files[options->num_identity_files++], |
42f11eb2 | 795 | "~/%.100s", _PATH_SSH_CLIENT_ID_DSA); |
fa08c86b | 796 | } |
a306f2dd | 797 | } |
5260325f | 798 | if (options->escape_char == -1) |
799 | options->escape_char = '~'; | |
800 | if (options->system_hostfile == NULL) | |
42f11eb2 | 801 | options->system_hostfile = _PATH_SSH_SYSTEM_HOSTFILE; |
5260325f | 802 | if (options->user_hostfile == NULL) |
42f11eb2 | 803 | options->user_hostfile = _PATH_SSH_USER_HOSTFILE; |
a306f2dd | 804 | if (options->system_hostfile2 == NULL) |
42f11eb2 | 805 | options->system_hostfile2 = _PATH_SSH_SYSTEM_HOSTFILE2; |
a306f2dd | 806 | if (options->user_hostfile2 == NULL) |
42f11eb2 | 807 | options->user_hostfile2 = _PATH_SSH_USER_HOSTFILE2; |
5260325f | 808 | if (options->log_level == (LogLevel) - 1) |
59c97189 | 809 | options->log_level = SYSLOG_LEVEL_INFO; |
5260325f | 810 | /* options->proxy_command should not be set by default */ |
811 | /* options->user will be set in the main program if appropriate */ | |
812 | /* options->hostname will be set in the main program if appropriate */ | |
8abcdba4 | 813 | /* options->host_key_alias should not be set by default */ |
8efc0c15 | 814 | } |