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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" | |
cab80f75 | 15 | RCSID("$OpenBSD: readconf.c,v 1.67 2001/03/10 17:51:04 markus 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" | |
b2552997 | 26 | #include "kex.h" |
27 | #include "mac.h" | |
8efc0c15 | 28 | |
29 | /* Format of the configuration file: | |
30 | ||
31 | # Configuration data is parsed as follows: | |
32 | # 1. command line options | |
33 | # 2. user-specific file | |
34 | # 3. system-wide file | |
35 | # Any configuration value is only changed the first time it is set. | |
36 | # Thus, host-specific definitions should be at the beginning of the | |
37 | # configuration file, and defaults at the end. | |
38 | ||
39 | # Host-specific declarations. These may override anything above. A single | |
40 | # host may match multiple declarations; these are processed in the order | |
41 | # that they are given in. | |
42 | ||
43 | Host *.ngs.fi ngs.fi | |
44 | FallBackToRsh no | |
45 | ||
46 | Host fake.com | |
47 | HostName another.host.name.real.org | |
48 | User blaah | |
49 | Port 34289 | |
50 | ForwardX11 no | |
51 | ForwardAgent no | |
52 | ||
53 | Host books.com | |
54 | RemoteForward 9999 shadows.cs.hut.fi:9999 | |
55 | Cipher 3des | |
56 | ||
57 | Host fascist.blob.com | |
58 | Port 23123 | |
59 | User tylonen | |
60 | RhostsAuthentication no | |
61 | PasswordAuthentication no | |
62 | ||
63 | Host puukko.hut.fi | |
64 | User t35124p | |
65 | ProxyCommand ssh-proxy %h %p | |
66 | ||
67 | Host *.fr | |
68 | UseRsh yes | |
69 | ||
70 | Host *.su | |
71 | Cipher none | |
72 | PasswordAuthentication no | |
73 | ||
74 | # Defaults for various options | |
75 | Host * | |
76 | ForwardAgent no | |
fa08c86b | 77 | ForwardX11 no |
8efc0c15 | 78 | RhostsAuthentication yes |
79 | PasswordAuthentication yes | |
80 | RSAAuthentication yes | |
81 | RhostsRSAAuthentication yes | |
82 | FallBackToRsh no | |
83 | UseRsh no | |
84 | StrictHostKeyChecking yes | |
85 | KeepAlives no | |
86 | IdentityFile ~/.ssh/identity | |
87 | Port 22 | |
88 | EscapeChar ~ | |
89 | ||
90 | */ | |
91 | ||
92 | /* Keyword tokens. */ | |
93 | ||
5260325f | 94 | typedef enum { |
95 | oBadOption, | |
96 | oForwardAgent, oForwardX11, oGatewayPorts, oRhostsAuthentication, | |
97 | oPasswordAuthentication, oRSAAuthentication, oFallBackToRsh, oUseRsh, | |
d464095c | 98 | oChallengeResponseAuthentication, oXAuthLocation, |
8efc0c15 | 99 | #ifdef KRB4 |
5260325f | 100 | oKerberosAuthentication, |
8efc0c15 | 101 | #endif /* KRB4 */ |
102 | #ifdef AFS | |
5260325f | 103 | oKerberosTgtPassing, oAFSTokenPassing, |
8efc0c15 | 104 | #endif |
5260325f | 105 | oIdentityFile, oHostName, oPort, oCipher, oRemoteForward, oLocalForward, |
106 | oUser, oHost, oEscapeChar, oRhostsRSAAuthentication, oProxyCommand, | |
107 | oGlobalKnownHostsFile, oUserKnownHostsFile, oConnectionAttempts, | |
108 | oBatchMode, oCheckHostIP, oStrictHostKeyChecking, oCompression, | |
d464095c | 109 | oCompressionLevel, oKeepAlives, oNumberOfPasswordPrompts, |
b2552997 | 110 | oUsePrivilegedPort, oLogLevel, oCiphers, oProtocol, oMacs, |
fa08c86b | 111 | oGlobalKnownHostsFile2, oUserKnownHostsFile2, oPubkeyAuthentication, |
cab80f75 | 112 | oKbdInteractiveAuthentication, oKbdInteractiveDevices, oHostKeyAlias, |
113 | oPreferredAuthentications | |
8efc0c15 | 114 | } OpCodes; |
115 | ||
116 | /* Textual representations of the tokens. */ | |
117 | ||
5260325f | 118 | static struct { |
119 | const char *name; | |
120 | OpCodes opcode; | |
121 | } keywords[] = { | |
122 | { "forwardagent", oForwardAgent }, | |
123 | { "forwardx11", oForwardX11 }, | |
fa649821 | 124 | { "xauthlocation", oXAuthLocation }, |
5260325f | 125 | { "gatewayports", oGatewayPorts }, |
126 | { "useprivilegedport", oUsePrivilegedPort }, | |
127 | { "rhostsauthentication", oRhostsAuthentication }, | |
128 | { "passwordauthentication", oPasswordAuthentication }, | |
94ec8c6b | 129 | { "kbdinteractiveauthentication", oKbdInteractiveAuthentication }, |
130 | { "kbdinteractivedevices", oKbdInteractiveDevices }, | |
5260325f | 131 | { "rsaauthentication", oRSAAuthentication }, |
fa08c86b | 132 | { "pubkeyauthentication", oPubkeyAuthentication }, |
d464095c | 133 | { "dsaauthentication", oPubkeyAuthentication }, /* alias */ |
134 | { "challengeresponseauthentication", oChallengeResponseAuthentication }, | |
135 | { "skeyauthentication", oChallengeResponseAuthentication }, /* alias */ | |
136 | { "tisauthentication", oChallengeResponseAuthentication }, /* alias */ | |
8efc0c15 | 137 | #ifdef KRB4 |
5260325f | 138 | { "kerberosauthentication", oKerberosAuthentication }, |
8efc0c15 | 139 | #endif /* KRB4 */ |
140 | #ifdef AFS | |
5260325f | 141 | { "kerberostgtpassing", oKerberosTgtPassing }, |
142 | { "afstokenpassing", oAFSTokenPassing }, | |
8efc0c15 | 143 | #endif |
5260325f | 144 | { "fallbacktorsh", oFallBackToRsh }, |
145 | { "usersh", oUseRsh }, | |
146 | { "identityfile", oIdentityFile }, | |
fa08c86b | 147 | { "identityfile2", oIdentityFile }, /* alias */ |
5260325f | 148 | { "hostname", oHostName }, |
8abcdba4 | 149 | { "hostkeyalias", oHostKeyAlias }, |
5260325f | 150 | { "proxycommand", oProxyCommand }, |
151 | { "port", oPort }, | |
152 | { "cipher", oCipher }, | |
a8be9f80 | 153 | { "ciphers", oCiphers }, |
b2552997 | 154 | { "macs", oMacs }, |
a8be9f80 | 155 | { "protocol", oProtocol }, |
5260325f | 156 | { "remoteforward", oRemoteForward }, |
157 | { "localforward", oLocalForward }, | |
158 | { "user", oUser }, | |
159 | { "host", oHost }, | |
160 | { "escapechar", oEscapeChar }, | |
161 | { "rhostsrsaauthentication", oRhostsRSAAuthentication }, | |
162 | { "globalknownhostsfile", oGlobalKnownHostsFile }, | |
163 | { "userknownhostsfile", oUserKnownHostsFile }, | |
a306f2dd | 164 | { "globalknownhostsfile2", oGlobalKnownHostsFile2 }, |
165 | { "userknownhostsfile2", oUserKnownHostsFile2 }, | |
5260325f | 166 | { "connectionattempts", oConnectionAttempts }, |
167 | { "batchmode", oBatchMode }, | |
168 | { "checkhostip", oCheckHostIP }, | |
169 | { "stricthostkeychecking", oStrictHostKeyChecking }, | |
170 | { "compression", oCompression }, | |
171 | { "compressionlevel", oCompressionLevel }, | |
172 | { "keepalive", oKeepAlives }, | |
173 | { "numberofpasswordprompts", oNumberOfPasswordPrompts }, | |
5260325f | 174 | { "loglevel", oLogLevel }, |
cab80f75 | 175 | { "preferredauthentications", oPreferredAuthentications }, |
5260325f | 176 | { NULL, 0 } |
6a17f9c2 | 177 | }; |
178 | ||
aa3378df | 179 | /* |
180 | * Adds a local TCP/IP port forward to options. Never returns if there is an | |
181 | * error. | |
182 | */ | |
8efc0c15 | 183 | |
6ae2364d | 184 | void |
57112b5a | 185 | add_local_forward(Options *options, u_short port, const char *host, |
186 | u_short host_port) | |
8efc0c15 | 187 | { |
5260325f | 188 | Forward *fwd; |
3c62e7eb | 189 | #ifndef HAVE_CYGWIN |
5260325f | 190 | extern uid_t original_real_uid; |
5260325f | 191 | if (port < IPPORT_RESERVED && original_real_uid != 0) |
54b974dc | 192 | fatal("Privileged ports can only be forwarded by root."); |
3c62e7eb | 193 | #endif |
5260325f | 194 | if (options->num_local_forwards >= SSH_MAX_FORWARDS_PER_DIRECTION) |
195 | fatal("Too many local forwards (max %d).", SSH_MAX_FORWARDS_PER_DIRECTION); | |
196 | fwd = &options->local_forwards[options->num_local_forwards++]; | |
197 | fwd->port = port; | |
198 | fwd->host = xstrdup(host); | |
199 | fwd->host_port = host_port; | |
8efc0c15 | 200 | } |
201 | ||
aa3378df | 202 | /* |
203 | * Adds a remote TCP/IP port forward to options. Never returns if there is | |
204 | * an error. | |
205 | */ | |
8efc0c15 | 206 | |
6ae2364d | 207 | void |
57112b5a | 208 | add_remote_forward(Options *options, u_short port, const char *host, |
209 | u_short host_port) | |
8efc0c15 | 210 | { |
5260325f | 211 | Forward *fwd; |
212 | if (options->num_remote_forwards >= SSH_MAX_FORWARDS_PER_DIRECTION) | |
213 | fatal("Too many remote forwards (max %d).", | |
214 | SSH_MAX_FORWARDS_PER_DIRECTION); | |
215 | fwd = &options->remote_forwards[options->num_remote_forwards++]; | |
216 | fwd->port = port; | |
217 | fwd->host = xstrdup(host); | |
218 | fwd->host_port = host_port; | |
8efc0c15 | 219 | } |
220 | ||
aa3378df | 221 | /* |
222 | * Returns the number of the token pointed to by cp of length len. Never | |
223 | * returns if the token is not known. | |
224 | */ | |
8efc0c15 | 225 | |
6ae2364d | 226 | static OpCodes |
5260325f | 227 | parse_token(const char *cp, const char *filename, int linenum) |
8efc0c15 | 228 | { |
1e3b8b07 | 229 | u_int i; |
8efc0c15 | 230 | |
5260325f | 231 | for (i = 0; keywords[i].name; i++) |
aa3378df | 232 | if (strcasecmp(cp, keywords[i].name) == 0) |
5260325f | 233 | return keywords[i].opcode; |
8efc0c15 | 234 | |
5260325f | 235 | fprintf(stderr, "%s: line %d: Bad configuration option: %s\n", |
236 | filename, linenum, cp); | |
237 | return oBadOption; | |
8efc0c15 | 238 | } |
239 | ||
aa3378df | 240 | /* |
241 | * Processes a single option line as used in the configuration files. This | |
242 | * only sets those values that have not already been set. | |
243 | */ | |
8efc0c15 | 244 | |
e7c0f9d5 | 245 | int |
246 | process_config_line(Options *options, const char *host, | |
5260325f | 247 | char *line, const char *filename, int linenum, |
248 | int *activep) | |
8efc0c15 | 249 | { |
089fbbd2 | 250 | char buf[256], *s, *string, **charptr, *endofnumber, *keyword, *arg; |
57112b5a | 251 | int opcode, *intptr, value; |
252 | u_short fwd_port, fwd_host_port; | |
5260325f | 253 | |
704b1659 | 254 | s = line; |
255 | /* Get the keyword. (Each line is supposed to begin with a keyword). */ | |
256 | keyword = strdelim(&s); | |
257 | /* Ignore leading whitespace. */ | |
258 | if (*keyword == '\0') | |
259 | keyword = strdelim(&s); | |
42f11eb2 | 260 | if (keyword == NULL || !*keyword || *keyword == '\n' || *keyword == '#') |
5260325f | 261 | return 0; |
262 | ||
089fbbd2 | 263 | opcode = parse_token(keyword, filename, linenum); |
5260325f | 264 | |
265 | switch (opcode) { | |
266 | case oBadOption: | |
aa3378df | 267 | /* don't panic, but count bad options */ |
268 | return -1; | |
5260325f | 269 | /* NOTREACHED */ |
270 | case oForwardAgent: | |
271 | intptr = &options->forward_agent; | |
272 | parse_flag: | |
704b1659 | 273 | arg = strdelim(&s); |
089fbbd2 | 274 | if (!arg || *arg == '\0') |
5260325f | 275 | fatal("%.200s line %d: Missing yes/no argument.", filename, linenum); |
276 | value = 0; /* To avoid compiler warning... */ | |
089fbbd2 | 277 | if (strcmp(arg, "yes") == 0 || strcmp(arg, "true") == 0) |
5260325f | 278 | value = 1; |
089fbbd2 | 279 | else if (strcmp(arg, "no") == 0 || strcmp(arg, "false") == 0) |
5260325f | 280 | value = 0; |
281 | else | |
282 | fatal("%.200s line %d: Bad yes/no argument.", filename, linenum); | |
283 | if (*activep && *intptr == -1) | |
284 | *intptr = value; | |
285 | break; | |
286 | ||
287 | case oForwardX11: | |
288 | intptr = &options->forward_x11; | |
289 | goto parse_flag; | |
290 | ||
291 | case oGatewayPorts: | |
292 | intptr = &options->gateway_ports; | |
293 | goto parse_flag; | |
294 | ||
295 | case oUsePrivilegedPort: | |
296 | intptr = &options->use_privileged_port; | |
297 | goto parse_flag; | |
298 | ||
299 | case oRhostsAuthentication: | |
300 | intptr = &options->rhosts_authentication; | |
301 | goto parse_flag; | |
302 | ||
303 | case oPasswordAuthentication: | |
304 | intptr = &options->password_authentication; | |
305 | goto parse_flag; | |
306 | ||
94ec8c6b | 307 | case oKbdInteractiveAuthentication: |
308 | intptr = &options->kbd_interactive_authentication; | |
309 | goto parse_flag; | |
310 | ||
311 | case oKbdInteractiveDevices: | |
312 | charptr = &options->kbd_interactive_devices; | |
313 | goto parse_string; | |
314 | ||
fa08c86b | 315 | case oPubkeyAuthentication: |
316 | intptr = &options->pubkey_authentication; | |
1d1ffb87 | 317 | goto parse_flag; |
318 | ||
5260325f | 319 | case oRSAAuthentication: |
320 | intptr = &options->rsa_authentication; | |
321 | goto parse_flag; | |
322 | ||
323 | case oRhostsRSAAuthentication: | |
324 | intptr = &options->rhosts_rsa_authentication; | |
325 | goto parse_flag; | |
326 | ||
d464095c | 327 | case oChallengeResponseAuthentication: |
328 | intptr = &options->challenge_reponse_authentication; | |
5260325f | 329 | goto parse_flag; |
8efc0c15 | 330 | |
331 | #ifdef KRB4 | |
5260325f | 332 | case oKerberosAuthentication: |
333 | intptr = &options->kerberos_authentication; | |
334 | goto parse_flag; | |
8efc0c15 | 335 | #endif /* KRB4 */ |
336 | ||
337 | #ifdef AFS | |
5260325f | 338 | case oKerberosTgtPassing: |
339 | intptr = &options->kerberos_tgt_passing; | |
340 | goto parse_flag; | |
8efc0c15 | 341 | |
5260325f | 342 | case oAFSTokenPassing: |
343 | intptr = &options->afs_token_passing; | |
344 | goto parse_flag; | |
8efc0c15 | 345 | #endif |
5260325f | 346 | |
347 | case oFallBackToRsh: | |
348 | intptr = &options->fallback_to_rsh; | |
349 | goto parse_flag; | |
350 | ||
351 | case oUseRsh: | |
352 | intptr = &options->use_rsh; | |
353 | goto parse_flag; | |
354 | ||
355 | case oBatchMode: | |
356 | intptr = &options->batch_mode; | |
357 | goto parse_flag; | |
358 | ||
359 | case oCheckHostIP: | |
360 | intptr = &options->check_host_ip; | |
361 | goto parse_flag; | |
362 | ||
363 | case oStrictHostKeyChecking: | |
364 | intptr = &options->strict_host_key_checking; | |
704b1659 | 365 | arg = strdelim(&s); |
089fbbd2 | 366 | if (!arg || *arg == '\0') |
c76c8819 | 367 | fatal("%.200s line %d: Missing yes/no/ask argument.", |
5260325f | 368 | filename, linenum); |
369 | value = 0; /* To avoid compiler warning... */ | |
089fbbd2 | 370 | if (strcmp(arg, "yes") == 0 || strcmp(arg, "true") == 0) |
5260325f | 371 | value = 1; |
089fbbd2 | 372 | else if (strcmp(arg, "no") == 0 || strcmp(arg, "false") == 0) |
5260325f | 373 | value = 0; |
089fbbd2 | 374 | else if (strcmp(arg, "ask") == 0) |
5260325f | 375 | value = 2; |
376 | else | |
377 | fatal("%.200s line %d: Bad yes/no/ask argument.", filename, linenum); | |
378 | if (*activep && *intptr == -1) | |
379 | *intptr = value; | |
380 | break; | |
381 | ||
382 | case oCompression: | |
383 | intptr = &options->compression; | |
384 | goto parse_flag; | |
385 | ||
386 | case oKeepAlives: | |
387 | intptr = &options->keepalives; | |
388 | goto parse_flag; | |
389 | ||
390 | case oNumberOfPasswordPrompts: | |
391 | intptr = &options->number_of_password_prompts; | |
392 | goto parse_int; | |
393 | ||
394 | case oCompressionLevel: | |
395 | intptr = &options->compression_level; | |
396 | goto parse_int; | |
397 | ||
398 | case oIdentityFile: | |
704b1659 | 399 | arg = strdelim(&s); |
089fbbd2 | 400 | if (!arg || *arg == '\0') |
5260325f | 401 | fatal("%.200s line %d: Missing argument.", filename, linenum); |
402 | if (*activep) { | |
fa08c86b | 403 | intptr = &options->num_identity_files; |
a306f2dd | 404 | if (*intptr >= SSH_MAX_IDENTITY_FILES) |
5260325f | 405 | fatal("%.200s line %d: Too many identity files specified (max %d).", |
406 | filename, linenum, SSH_MAX_IDENTITY_FILES); | |
fa08c86b | 407 | charptr = &options->identity_files[*intptr]; |
089fbbd2 | 408 | *charptr = xstrdup(arg); |
a306f2dd | 409 | *intptr = *intptr + 1; |
5260325f | 410 | } |
411 | break; | |
412 | ||
fa649821 | 413 | case oXAuthLocation: |
414 | charptr=&options->xauth_location; | |
415 | goto parse_string; | |
416 | ||
5260325f | 417 | case oUser: |
418 | charptr = &options->user; | |
419 | parse_string: | |
704b1659 | 420 | arg = strdelim(&s); |
089fbbd2 | 421 | if (!arg || *arg == '\0') |
5260325f | 422 | fatal("%.200s line %d: Missing argument.", filename, linenum); |
423 | if (*activep && *charptr == NULL) | |
089fbbd2 | 424 | *charptr = xstrdup(arg); |
5260325f | 425 | break; |
426 | ||
427 | case oGlobalKnownHostsFile: | |
428 | charptr = &options->system_hostfile; | |
429 | goto parse_string; | |
430 | ||
431 | case oUserKnownHostsFile: | |
432 | charptr = &options->user_hostfile; | |
433 | goto parse_string; | |
434 | ||
a306f2dd | 435 | case oGlobalKnownHostsFile2: |
436 | charptr = &options->system_hostfile2; | |
437 | goto parse_string; | |
438 | ||
439 | case oUserKnownHostsFile2: | |
440 | charptr = &options->user_hostfile2; | |
441 | goto parse_string; | |
442 | ||
5260325f | 443 | case oHostName: |
444 | charptr = &options->hostname; | |
445 | goto parse_string; | |
446 | ||
8abcdba4 | 447 | case oHostKeyAlias: |
448 | charptr = &options->host_key_alias; | |
449 | goto parse_string; | |
450 | ||
cab80f75 | 451 | case oPreferredAuthentications: |
452 | charptr = &options->preferred_authentications; | |
453 | goto parse_string; | |
454 | ||
5260325f | 455 | case oProxyCommand: |
456 | charptr = &options->proxy_command; | |
457 | string = xstrdup(""); | |
704b1659 | 458 | while ((arg = strdelim(&s)) != NULL && *arg != '\0') { |
089fbbd2 | 459 | string = xrealloc(string, strlen(string) + strlen(arg) + 2); |
5260325f | 460 | strcat(string, " "); |
089fbbd2 | 461 | strcat(string, arg); |
5260325f | 462 | } |
463 | if (*activep && *charptr == NULL) | |
464 | *charptr = string; | |
465 | else | |
466 | xfree(string); | |
467 | return 0; | |
468 | ||
469 | case oPort: | |
470 | intptr = &options->port; | |
471 | parse_int: | |
704b1659 | 472 | arg = strdelim(&s); |
089fbbd2 | 473 | if (!arg || *arg == '\0') |
5260325f | 474 | fatal("%.200s line %d: Missing argument.", filename, linenum); |
089fbbd2 | 475 | if (arg[0] < '0' || arg[0] > '9') |
5260325f | 476 | fatal("%.200s line %d: Bad number.", filename, linenum); |
aa3378df | 477 | |
478 | /* Octal, decimal, or hex format? */ | |
089fbbd2 | 479 | value = strtol(arg, &endofnumber, 0); |
480 | if (arg == endofnumber) | |
aa3378df | 481 | fatal("%.200s line %d: Bad number.", filename, linenum); |
5260325f | 482 | if (*activep && *intptr == -1) |
483 | *intptr = value; | |
484 | break; | |
485 | ||
486 | case oConnectionAttempts: | |
487 | intptr = &options->connection_attempts; | |
488 | goto parse_int; | |
489 | ||
490 | case oCipher: | |
491 | intptr = &options->cipher; | |
704b1659 | 492 | arg = strdelim(&s); |
089fbbd2 | 493 | if (!arg || *arg == '\0') |
71276795 | 494 | fatal("%.200s line %d: Missing argument.", filename, linenum); |
089fbbd2 | 495 | value = cipher_number(arg); |
5260325f | 496 | if (value == -1) |
497 | fatal("%.200s line %d: Bad cipher '%s'.", | |
089fbbd2 | 498 | filename, linenum, arg ? arg : "<NONE>"); |
5260325f | 499 | if (*activep && *intptr == -1) |
500 | *intptr = value; | |
501 | break; | |
502 | ||
a8be9f80 | 503 | case oCiphers: |
704b1659 | 504 | arg = strdelim(&s); |
089fbbd2 | 505 | if (!arg || *arg == '\0') |
71276795 | 506 | fatal("%.200s line %d: Missing argument.", filename, linenum); |
089fbbd2 | 507 | if (!ciphers_valid(arg)) |
d0c832f3 | 508 | fatal("%.200s line %d: Bad SSH2 cipher spec '%s'.", |
089fbbd2 | 509 | filename, linenum, arg ? arg : "<NONE>"); |
a8be9f80 | 510 | if (*activep && options->ciphers == NULL) |
089fbbd2 | 511 | options->ciphers = xstrdup(arg); |
a8be9f80 | 512 | break; |
513 | ||
b2552997 | 514 | case oMacs: |
515 | arg = strdelim(&s); | |
516 | if (!arg || *arg == '\0') | |
517 | fatal("%.200s line %d: Missing argument.", filename, linenum); | |
518 | if (!mac_valid(arg)) | |
519 | fatal("%.200s line %d: Bad SSH2 Mac spec '%s'.", | |
520 | filename, linenum, arg ? arg : "<NONE>"); | |
521 | if (*activep && options->macs == NULL) | |
522 | options->macs = xstrdup(arg); | |
523 | break; | |
524 | ||
a8be9f80 | 525 | case oProtocol: |
526 | intptr = &options->protocol; | |
704b1659 | 527 | arg = strdelim(&s); |
089fbbd2 | 528 | if (!arg || *arg == '\0') |
71276795 | 529 | fatal("%.200s line %d: Missing argument.", filename, linenum); |
089fbbd2 | 530 | value = proto_spec(arg); |
a8be9f80 | 531 | if (value == SSH_PROTO_UNKNOWN) |
532 | fatal("%.200s line %d: Bad protocol spec '%s'.", | |
089fbbd2 | 533 | filename, linenum, arg ? arg : "<NONE>"); |
a8be9f80 | 534 | if (*activep && *intptr == SSH_PROTO_UNKNOWN) |
535 | *intptr = value; | |
536 | break; | |
537 | ||
5260325f | 538 | case oLogLevel: |
539 | intptr = (int *) &options->log_level; | |
704b1659 | 540 | arg = strdelim(&s); |
089fbbd2 | 541 | value = log_level_number(arg); |
5260325f | 542 | if (value == (LogLevel) - 1) |
54b974dc | 543 | fatal("%.200s line %d: unsupported log level '%s'", |
089fbbd2 | 544 | filename, linenum, arg ? arg : "<NONE>"); |
5260325f | 545 | if (*activep && (LogLevel) * intptr == -1) |
546 | *intptr = (LogLevel) value; | |
547 | break; | |
548 | ||
549 | case oRemoteForward: | |
704b1659 | 550 | arg = strdelim(&s); |
089fbbd2 | 551 | if (!arg || *arg == '\0') |
5260325f | 552 | fatal("%.200s line %d: Missing argument.", filename, linenum); |
089fbbd2 | 553 | if (arg[0] < '0' || arg[0] > '9') |
5260325f | 554 | fatal("%.200s line %d: Badly formatted port number.", |
555 | filename, linenum); | |
089fbbd2 | 556 | fwd_port = atoi(arg); |
704b1659 | 557 | arg = strdelim(&s); |
089fbbd2 | 558 | if (!arg || *arg == '\0') |
5260325f | 559 | fatal("%.200s line %d: Missing second argument.", |
560 | filename, linenum); | |
089fbbd2 | 561 | if (sscanf(arg, "%255[^:]:%hu", buf, &fwd_host_port) != 2) |
5260325f | 562 | fatal("%.200s line %d: Badly formatted host:port.", |
563 | filename, linenum); | |
564 | if (*activep) | |
565 | add_remote_forward(options, fwd_port, buf, fwd_host_port); | |
566 | break; | |
567 | ||
568 | case oLocalForward: | |
704b1659 | 569 | arg = strdelim(&s); |
089fbbd2 | 570 | if (!arg || *arg == '\0') |
5260325f | 571 | fatal("%.200s line %d: Missing argument.", filename, linenum); |
089fbbd2 | 572 | if (arg[0] < '0' || arg[0] > '9') |
5260325f | 573 | fatal("%.200s line %d: Badly formatted port number.", |
574 | filename, linenum); | |
089fbbd2 | 575 | fwd_port = atoi(arg); |
704b1659 | 576 | arg = strdelim(&s); |
089fbbd2 | 577 | if (!arg || *arg == '\0') |
5260325f | 578 | fatal("%.200s line %d: Missing second argument.", |
579 | filename, linenum); | |
089fbbd2 | 580 | if (sscanf(arg, "%255[^:]:%hu", buf, &fwd_host_port) != 2) |
5260325f | 581 | fatal("%.200s line %d: Badly formatted host:port.", |
582 | filename, linenum); | |
583 | if (*activep) | |
584 | add_local_forward(options, fwd_port, buf, fwd_host_port); | |
585 | break; | |
586 | ||
587 | case oHost: | |
588 | *activep = 0; | |
704b1659 | 589 | while ((arg = strdelim(&s)) != NULL && *arg != '\0') |
089fbbd2 | 590 | if (match_pattern(host, arg)) { |
591 | debug("Applying options for %.100s", arg); | |
5260325f | 592 | *activep = 1; |
593 | break; | |
594 | } | |
704b1659 | 595 | /* Avoid garbage check below, as strdelim is done. */ |
5260325f | 596 | return 0; |
597 | ||
598 | case oEscapeChar: | |
599 | intptr = &options->escape_char; | |
704b1659 | 600 | arg = strdelim(&s); |
089fbbd2 | 601 | if (!arg || *arg == '\0') |
5260325f | 602 | fatal("%.200s line %d: Missing argument.", filename, linenum); |
089fbbd2 | 603 | if (arg[0] == '^' && arg[2] == 0 && |
1e3b8b07 | 604 | (u_char) arg[1] >= 64 && (u_char) arg[1] < 128) |
605 | value = (u_char) arg[1] & 31; | |
089fbbd2 | 606 | else if (strlen(arg) == 1) |
1e3b8b07 | 607 | value = (u_char) arg[0]; |
089fbbd2 | 608 | else if (strcmp(arg, "none") == 0) |
5260325f | 609 | value = -2; |
610 | else { | |
611 | fatal("%.200s line %d: Bad escape character.", | |
612 | filename, linenum); | |
613 | /* NOTREACHED */ | |
614 | value = 0; /* Avoid compiler warning. */ | |
615 | } | |
616 | if (*activep && *intptr == -1) | |
617 | *intptr = value; | |
618 | break; | |
619 | ||
620 | default: | |
621 | fatal("process_config_line: Unimplemented opcode %d", opcode); | |
622 | } | |
623 | ||
624 | /* Check that there is no garbage at end of line. */ | |
42f11eb2 | 625 | if ((arg = strdelim(&s)) != NULL && *arg != '\0') { |
089fbbd2 | 626 | fatal("%.200s line %d: garbage at end of line; \"%.200s\".", |
627 | filename, linenum, arg); | |
628 | } | |
5260325f | 629 | return 0; |
8efc0c15 | 630 | } |
631 | ||
632 | ||
aa3378df | 633 | /* |
634 | * Reads the config file and modifies the options accordingly. Options | |
635 | * should already be initialized before this call. This never returns if | |
636 | * there is an error. If the file does not exist, this returns immediately. | |
637 | */ | |
8efc0c15 | 638 | |
6ae2364d | 639 | void |
5260325f | 640 | read_config_file(const char *filename, const char *host, Options *options) |
8efc0c15 | 641 | { |
5260325f | 642 | FILE *f; |
643 | char line[1024]; | |
644 | int active, linenum; | |
645 | int bad_options = 0; | |
646 | ||
647 | /* Open the file. */ | |
648 | f = fopen(filename, "r"); | |
649 | if (!f) | |
650 | return; | |
651 | ||
652 | debug("Reading configuration data %.200s", filename); | |
653 | ||
aa3378df | 654 | /* |
655 | * Mark that we are now processing the options. This flag is turned | |
656 | * on/off by Host specifications. | |
657 | */ | |
5260325f | 658 | active = 1; |
659 | linenum = 0; | |
660 | while (fgets(line, sizeof(line), f)) { | |
661 | /* Update line number counter. */ | |
662 | linenum++; | |
663 | if (process_config_line(options, host, line, filename, linenum, &active) != 0) | |
664 | bad_options++; | |
665 | } | |
666 | fclose(f); | |
667 | if (bad_options > 0) | |
54b974dc | 668 | fatal("%s: terminating, %d bad configuration options", |
5260325f | 669 | filename, bad_options); |
8efc0c15 | 670 | } |
671 | ||
aa3378df | 672 | /* |
673 | * Initializes options to special values that indicate that they have not yet | |
674 | * been set. Read_config_file will only set options with this value. Options | |
675 | * are processed in the following order: command line, user config file, | |
676 | * system config file. Last, fill_default_options is called. | |
677 | */ | |
8efc0c15 | 678 | |
6ae2364d | 679 | void |
5260325f | 680 | initialize_options(Options * options) |
8efc0c15 | 681 | { |
5260325f | 682 | memset(options, 'X', sizeof(*options)); |
683 | options->forward_agent = -1; | |
684 | options->forward_x11 = -1; | |
fa649821 | 685 | options->xauth_location = NULL; |
5260325f | 686 | options->gateway_ports = -1; |
687 | options->use_privileged_port = -1; | |
688 | options->rhosts_authentication = -1; | |
689 | options->rsa_authentication = -1; | |
fa08c86b | 690 | options->pubkey_authentication = -1; |
d464095c | 691 | options->challenge_reponse_authentication = -1; |
8efc0c15 | 692 | #ifdef KRB4 |
5260325f | 693 | options->kerberos_authentication = -1; |
8efc0c15 | 694 | #endif |
695 | #ifdef AFS | |
5260325f | 696 | options->kerberos_tgt_passing = -1; |
697 | options->afs_token_passing = -1; | |
8efc0c15 | 698 | #endif |
5260325f | 699 | options->password_authentication = -1; |
94ec8c6b | 700 | options->kbd_interactive_authentication = -1; |
701 | options->kbd_interactive_devices = NULL; | |
5260325f | 702 | options->rhosts_rsa_authentication = -1; |
703 | options->fallback_to_rsh = -1; | |
704 | options->use_rsh = -1; | |
705 | options->batch_mode = -1; | |
706 | options->check_host_ip = -1; | |
707 | options->strict_host_key_checking = -1; | |
708 | options->compression = -1; | |
709 | options->keepalives = -1; | |
710 | options->compression_level = -1; | |
711 | options->port = -1; | |
712 | options->connection_attempts = -1; | |
713 | options->number_of_password_prompts = -1; | |
714 | options->cipher = -1; | |
a8be9f80 | 715 | options->ciphers = NULL; |
b2552997 | 716 | options->macs = NULL; |
a8be9f80 | 717 | options->protocol = SSH_PROTO_UNKNOWN; |
5260325f | 718 | options->num_identity_files = 0; |
719 | options->hostname = NULL; | |
8abcdba4 | 720 | options->host_key_alias = NULL; |
5260325f | 721 | options->proxy_command = NULL; |
722 | options->user = NULL; | |
723 | options->escape_char = -1; | |
724 | options->system_hostfile = NULL; | |
725 | options->user_hostfile = NULL; | |
a306f2dd | 726 | options->system_hostfile2 = NULL; |
727 | options->user_hostfile2 = NULL; | |
5260325f | 728 | options->num_local_forwards = 0; |
729 | options->num_remote_forwards = 0; | |
730 | options->log_level = (LogLevel) - 1; | |
cab80f75 | 731 | options->preferred_authentications = NULL; |
8efc0c15 | 732 | } |
733 | ||
aa3378df | 734 | /* |
735 | * Called after processing other sources of option data, this fills those | |
736 | * options for which no value has been specified with their default values. | |
737 | */ | |
8efc0c15 | 738 | |
6ae2364d | 739 | void |
5260325f | 740 | fill_default_options(Options * options) |
8efc0c15 | 741 | { |
d2c46e77 | 742 | int len; |
743 | ||
5260325f | 744 | if (options->forward_agent == -1) |
71276795 | 745 | options->forward_agent = 0; |
5260325f | 746 | if (options->forward_x11 == -1) |
c8d54615 | 747 | options->forward_x11 = 0; |
fa649821 | 748 | #ifdef XAUTH_PATH |
749 | if (options->xauth_location == NULL) | |
750 | options->xauth_location = XAUTH_PATH; | |
751 | #endif /* XAUTH_PATH */ | |
5260325f | 752 | if (options->gateway_ports == -1) |
753 | options->gateway_ports = 0; | |
754 | if (options->use_privileged_port == -1) | |
d5ebca2b | 755 | options->use_privileged_port = 0; |
5260325f | 756 | if (options->rhosts_authentication == -1) |
757 | options->rhosts_authentication = 1; | |
758 | if (options->rsa_authentication == -1) | |
759 | options->rsa_authentication = 1; | |
fa08c86b | 760 | if (options->pubkey_authentication == -1) |
761 | options->pubkey_authentication = 1; | |
d464095c | 762 | if (options->challenge_reponse_authentication == -1) |
763 | options->challenge_reponse_authentication = 0; | |
8efc0c15 | 764 | #ifdef KRB4 |
5260325f | 765 | if (options->kerberos_authentication == -1) |
766 | options->kerberos_authentication = 1; | |
8efc0c15 | 767 | #endif /* KRB4 */ |
768 | #ifdef AFS | |
5260325f | 769 | if (options->kerberos_tgt_passing == -1) |
770 | options->kerberos_tgt_passing = 1; | |
771 | if (options->afs_token_passing == -1) | |
772 | options->afs_token_passing = 1; | |
8efc0c15 | 773 | #endif /* AFS */ |
5260325f | 774 | if (options->password_authentication == -1) |
775 | options->password_authentication = 1; | |
94ec8c6b | 776 | if (options->kbd_interactive_authentication == -1) |
d464095c | 777 | options->kbd_interactive_authentication = 1; |
5260325f | 778 | if (options->rhosts_rsa_authentication == -1) |
779 | options->rhosts_rsa_authentication = 1; | |
780 | if (options->fallback_to_rsh == -1) | |
3f7a7e4a | 781 | options->fallback_to_rsh = 0; |
5260325f | 782 | if (options->use_rsh == -1) |
783 | options->use_rsh = 0; | |
784 | if (options->batch_mode == -1) | |
785 | options->batch_mode = 0; | |
786 | if (options->check_host_ip == -1) | |
787 | options->check_host_ip = 1; | |
788 | if (options->strict_host_key_checking == -1) | |
789 | options->strict_host_key_checking = 2; /* 2 is default */ | |
790 | if (options->compression == -1) | |
791 | options->compression = 0; | |
792 | if (options->keepalives == -1) | |
793 | options->keepalives = 1; | |
794 | if (options->compression_level == -1) | |
795 | options->compression_level = 6; | |
796 | if (options->port == -1) | |
797 | options->port = 0; /* Filled in ssh_connect. */ | |
798 | if (options->connection_attempts == -1) | |
799 | options->connection_attempts = 4; | |
800 | if (options->number_of_password_prompts == -1) | |
801 | options->number_of_password_prompts = 3; | |
802 | /* Selected in ssh_login(). */ | |
803 | if (options->cipher == -1) | |
804 | options->cipher = SSH_CIPHER_NOT_SET; | |
d0c832f3 | 805 | /* options->ciphers, default set in myproposals.h */ |
b2552997 | 806 | /* options->macs, default set in myproposals.h */ |
a8be9f80 | 807 | if (options->protocol == SSH_PROTO_UNKNOWN) |
5e36d59c | 808 | options->protocol = SSH_PROTO_1|SSH_PROTO_2; |
5260325f | 809 | if (options->num_identity_files == 0) { |
fa08c86b | 810 | if (options->protocol & SSH_PROTO_1) { |
d2c46e77 | 811 | len = 2 + strlen(_PATH_SSH_CLIENT_IDENTITY) + 1; |
fa08c86b | 812 | options->identity_files[options->num_identity_files] = |
d2c46e77 | 813 | xmalloc(len); |
814 | snprintf(options->identity_files[options->num_identity_files++], | |
815 | len, "~/%.100s", _PATH_SSH_CLIENT_IDENTITY); | |
fa08c86b | 816 | } |
817 | if (options->protocol & SSH_PROTO_2) { | |
ec63b02d | 818 | len = 2 + strlen(_PATH_SSH_CLIENT_ID_RSA) + 1; |
819 | options->identity_files[options->num_identity_files] = | |
820 | xmalloc(len); | |
821 | snprintf(options->identity_files[options->num_identity_files++], | |
822 | len, "~/%.100s", _PATH_SSH_CLIENT_ID_RSA); | |
823 | ||
d2c46e77 | 824 | len = 2 + strlen(_PATH_SSH_CLIENT_ID_DSA) + 1; |
fa08c86b | 825 | options->identity_files[options->num_identity_files] = |
d2c46e77 | 826 | xmalloc(len); |
827 | snprintf(options->identity_files[options->num_identity_files++], | |
828 | len, "~/%.100s", _PATH_SSH_CLIENT_ID_DSA); | |
fa08c86b | 829 | } |
a306f2dd | 830 | } |
5260325f | 831 | if (options->escape_char == -1) |
832 | options->escape_char = '~'; | |
833 | if (options->system_hostfile == NULL) | |
42f11eb2 | 834 | options->system_hostfile = _PATH_SSH_SYSTEM_HOSTFILE; |
5260325f | 835 | if (options->user_hostfile == NULL) |
42f11eb2 | 836 | options->user_hostfile = _PATH_SSH_USER_HOSTFILE; |
a306f2dd | 837 | if (options->system_hostfile2 == NULL) |
42f11eb2 | 838 | options->system_hostfile2 = _PATH_SSH_SYSTEM_HOSTFILE2; |
a306f2dd | 839 | if (options->user_hostfile2 == NULL) |
42f11eb2 | 840 | options->user_hostfile2 = _PATH_SSH_USER_HOSTFILE2; |
5260325f | 841 | if (options->log_level == (LogLevel) - 1) |
59c97189 | 842 | options->log_level = SYSLOG_LEVEL_INFO; |
5260325f | 843 | /* options->proxy_command should not be set by default */ |
844 | /* options->user will be set in the main program if appropriate */ | |
845 | /* options->hostname will be set in the main program if appropriate */ | |
8abcdba4 | 846 | /* options->host_key_alias should not be set by default */ |
cab80f75 | 847 | /* options->preferred_authentications will be set in ssh */ |
8efc0c15 | 848 | } |