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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" | |
10a2cbef | 15 | RCSID("$OpenBSD: readconf.c,v 1.83 2001/07/22 22:04:19 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, |
ced49be2 | 99 | #if defined(KRB4) || defined(KRB5) |
5260325f | 100 | oKerberosAuthentication, |
ced49be2 | 101 | #endif |
102 | #if defined(AFS) || defined(KRB5) | |
103 | oKerberosTgtPassing, | |
104 | #endif | |
8efc0c15 | 105 | #ifdef AFS |
ced49be2 | 106 | oAFSTokenPassing, |
8efc0c15 | 107 | #endif |
5260325f | 108 | oIdentityFile, oHostName, oPort, oCipher, oRemoteForward, oLocalForward, |
109 | oUser, oHost, oEscapeChar, oRhostsRSAAuthentication, oProxyCommand, | |
110 | oGlobalKnownHostsFile, oUserKnownHostsFile, oConnectionAttempts, | |
111 | oBatchMode, oCheckHostIP, oStrictHostKeyChecking, oCompression, | |
d464095c | 112 | oCompressionLevel, oKeepAlives, oNumberOfPasswordPrompts, |
b2552997 | 113 | oUsePrivilegedPort, oLogLevel, oCiphers, oProtocol, oMacs, |
fa08c86b | 114 | oGlobalKnownHostsFile2, oUserKnownHostsFile2, oPubkeyAuthentication, |
cab80f75 | 115 | oKbdInteractiveAuthentication, oKbdInteractiveDevices, oHostKeyAlias, |
e961a8f9 | 116 | oDynamicForward, oPreferredAuthentications, oHostbasedAuthentication, |
3435f5a6 | 117 | oHostKeyAlgorithms, oBindAddress |
8efc0c15 | 118 | } OpCodes; |
119 | ||
120 | /* Textual representations of the tokens. */ | |
121 | ||
5260325f | 122 | static struct { |
123 | const char *name; | |
124 | OpCodes opcode; | |
125 | } keywords[] = { | |
126 | { "forwardagent", oForwardAgent }, | |
127 | { "forwardx11", oForwardX11 }, | |
fa649821 | 128 | { "xauthlocation", oXAuthLocation }, |
5260325f | 129 | { "gatewayports", oGatewayPorts }, |
130 | { "useprivilegedport", oUsePrivilegedPort }, | |
131 | { "rhostsauthentication", oRhostsAuthentication }, | |
132 | { "passwordauthentication", oPasswordAuthentication }, | |
94ec8c6b | 133 | { "kbdinteractiveauthentication", oKbdInteractiveAuthentication }, |
134 | { "kbdinteractivedevices", oKbdInteractiveDevices }, | |
5260325f | 135 | { "rsaauthentication", oRSAAuthentication }, |
fa08c86b | 136 | { "pubkeyauthentication", oPubkeyAuthentication }, |
d464095c | 137 | { "dsaauthentication", oPubkeyAuthentication }, /* alias */ |
8002af61 | 138 | { "rhostsrsaauthentication", oRhostsRSAAuthentication }, |
0140e66a | 139 | { "hostbasedauthentication", oHostbasedAuthentication }, |
d464095c | 140 | { "challengeresponseauthentication", oChallengeResponseAuthentication }, |
141 | { "skeyauthentication", oChallengeResponseAuthentication }, /* alias */ | |
142 | { "tisauthentication", oChallengeResponseAuthentication }, /* alias */ | |
ced49be2 | 143 | #if defined(KRB4) || defined(KRB5) |
5260325f | 144 | { "kerberosauthentication", oKerberosAuthentication }, |
ced49be2 | 145 | #endif |
146 | #if defined(AFS) || defined(KRB5) | |
5260325f | 147 | { "kerberostgtpassing", oKerberosTgtPassing }, |
ced49be2 | 148 | #endif |
149 | #ifdef AFS | |
5260325f | 150 | { "afstokenpassing", oAFSTokenPassing }, |
8efc0c15 | 151 | #endif |
5260325f | 152 | { "fallbacktorsh", oFallBackToRsh }, |
153 | { "usersh", oUseRsh }, | |
154 | { "identityfile", oIdentityFile }, | |
fa08c86b | 155 | { "identityfile2", oIdentityFile }, /* alias */ |
5260325f | 156 | { "hostname", oHostName }, |
8abcdba4 | 157 | { "hostkeyalias", oHostKeyAlias }, |
5260325f | 158 | { "proxycommand", oProxyCommand }, |
159 | { "port", oPort }, | |
160 | { "cipher", oCipher }, | |
a8be9f80 | 161 | { "ciphers", oCiphers }, |
b2552997 | 162 | { "macs", oMacs }, |
a8be9f80 | 163 | { "protocol", oProtocol }, |
5260325f | 164 | { "remoteforward", oRemoteForward }, |
165 | { "localforward", oLocalForward }, | |
166 | { "user", oUser }, | |
167 | { "host", oHost }, | |
168 | { "escapechar", oEscapeChar }, | |
5260325f | 169 | { "globalknownhostsfile", oGlobalKnownHostsFile }, |
f49bc4f7 | 170 | { "userknownhostsfile", oUserKnownHostsFile }, /* obsolete */ |
a306f2dd | 171 | { "globalknownhostsfile2", oGlobalKnownHostsFile2 }, |
f49bc4f7 | 172 | { "userknownhostsfile2", oUserKnownHostsFile2 }, /* obsolete */ |
5260325f | 173 | { "connectionattempts", oConnectionAttempts }, |
174 | { "batchmode", oBatchMode }, | |
175 | { "checkhostip", oCheckHostIP }, | |
176 | { "stricthostkeychecking", oStrictHostKeyChecking }, | |
177 | { "compression", oCompression }, | |
178 | { "compressionlevel", oCompressionLevel }, | |
179 | { "keepalive", oKeepAlives }, | |
180 | { "numberofpasswordprompts", oNumberOfPasswordPrompts }, | |
5260325f | 181 | { "loglevel", oLogLevel }, |
0490e609 | 182 | { "dynamicforward", oDynamicForward }, |
cab80f75 | 183 | { "preferredauthentications", oPreferredAuthentications }, |
e961a8f9 | 184 | { "hostkeyalgorithms", oHostKeyAlgorithms }, |
3435f5a6 | 185 | { "bindaddress", oBindAddress }, |
5260325f | 186 | { NULL, 0 } |
6a17f9c2 | 187 | }; |
188 | ||
aa3378df | 189 | /* |
190 | * Adds a local TCP/IP port forward to options. Never returns if there is an | |
191 | * error. | |
192 | */ | |
8efc0c15 | 193 | |
6ae2364d | 194 | void |
57112b5a | 195 | add_local_forward(Options *options, u_short port, const char *host, |
196 | u_short host_port) | |
8efc0c15 | 197 | { |
5260325f | 198 | Forward *fwd; |
3c62e7eb | 199 | #ifndef HAVE_CYGWIN |
5260325f | 200 | extern uid_t original_real_uid; |
5260325f | 201 | if (port < IPPORT_RESERVED && original_real_uid != 0) |
54b974dc | 202 | fatal("Privileged ports can only be forwarded by root."); |
3c62e7eb | 203 | #endif |
5260325f | 204 | if (options->num_local_forwards >= SSH_MAX_FORWARDS_PER_DIRECTION) |
205 | fatal("Too many local forwards (max %d).", SSH_MAX_FORWARDS_PER_DIRECTION); | |
206 | fwd = &options->local_forwards[options->num_local_forwards++]; | |
207 | fwd->port = port; | |
208 | fwd->host = xstrdup(host); | |
209 | fwd->host_port = host_port; | |
8efc0c15 | 210 | } |
211 | ||
aa3378df | 212 | /* |
213 | * Adds a remote TCP/IP port forward to options. Never returns if there is | |
214 | * an error. | |
215 | */ | |
8efc0c15 | 216 | |
6ae2364d | 217 | void |
57112b5a | 218 | add_remote_forward(Options *options, u_short port, const char *host, |
219 | u_short host_port) | |
8efc0c15 | 220 | { |
5260325f | 221 | Forward *fwd; |
222 | if (options->num_remote_forwards >= SSH_MAX_FORWARDS_PER_DIRECTION) | |
223 | fatal("Too many remote forwards (max %d).", | |
224 | SSH_MAX_FORWARDS_PER_DIRECTION); | |
225 | fwd = &options->remote_forwards[options->num_remote_forwards++]; | |
226 | fwd->port = port; | |
227 | fwd->host = xstrdup(host); | |
228 | fwd->host_port = host_port; | |
8efc0c15 | 229 | } |
230 | ||
aa3378df | 231 | /* |
6be9a5e8 | 232 | * Returns the number of the token pointed to by cp or oBadOption. |
aa3378df | 233 | */ |
8efc0c15 | 234 | |
6ae2364d | 235 | static OpCodes |
5260325f | 236 | parse_token(const char *cp, const char *filename, int linenum) |
8efc0c15 | 237 | { |
1e3b8b07 | 238 | u_int i; |
8efc0c15 | 239 | |
5260325f | 240 | for (i = 0; keywords[i].name; i++) |
aa3378df | 241 | if (strcasecmp(cp, keywords[i].name) == 0) |
5260325f | 242 | return keywords[i].opcode; |
8efc0c15 | 243 | |
b7c70970 | 244 | error("%s: line %d: Bad configuration option: %s", |
245 | filename, linenum, cp); | |
5260325f | 246 | return oBadOption; |
8efc0c15 | 247 | } |
248 | ||
aa3378df | 249 | /* |
250 | * Processes a single option line as used in the configuration files. This | |
251 | * only sets those values that have not already been set. | |
252 | */ | |
8efc0c15 | 253 | |
e7c0f9d5 | 254 | int |
255 | process_config_line(Options *options, const char *host, | |
5260325f | 256 | char *line, const char *filename, int linenum, |
257 | int *activep) | |
8efc0c15 | 258 | { |
4f7893dc | 259 | char buf[256], *s, *string = NULL, **charptr, *endofnumber, *keyword, |
260 | *arg; | |
57112b5a | 261 | int opcode, *intptr, value; |
262 | u_short fwd_port, fwd_host_port; | |
5260325f | 263 | |
704b1659 | 264 | s = line; |
265 | /* Get the keyword. (Each line is supposed to begin with a keyword). */ | |
266 | keyword = strdelim(&s); | |
267 | /* Ignore leading whitespace. */ | |
268 | if (*keyword == '\0') | |
269 | keyword = strdelim(&s); | |
42f11eb2 | 270 | if (keyword == NULL || !*keyword || *keyword == '\n' || *keyword == '#') |
5260325f | 271 | return 0; |
272 | ||
089fbbd2 | 273 | opcode = parse_token(keyword, filename, linenum); |
5260325f | 274 | |
275 | switch (opcode) { | |
276 | case oBadOption: | |
aa3378df | 277 | /* don't panic, but count bad options */ |
278 | return -1; | |
5260325f | 279 | /* NOTREACHED */ |
280 | case oForwardAgent: | |
281 | intptr = &options->forward_agent; | |
282 | parse_flag: | |
704b1659 | 283 | arg = strdelim(&s); |
089fbbd2 | 284 | if (!arg || *arg == '\0') |
5260325f | 285 | fatal("%.200s line %d: Missing yes/no argument.", filename, linenum); |
286 | value = 0; /* To avoid compiler warning... */ | |
089fbbd2 | 287 | if (strcmp(arg, "yes") == 0 || strcmp(arg, "true") == 0) |
5260325f | 288 | value = 1; |
089fbbd2 | 289 | else if (strcmp(arg, "no") == 0 || strcmp(arg, "false") == 0) |
5260325f | 290 | value = 0; |
291 | else | |
292 | fatal("%.200s line %d: Bad yes/no argument.", filename, linenum); | |
293 | if (*activep && *intptr == -1) | |
294 | *intptr = value; | |
295 | break; | |
296 | ||
297 | case oForwardX11: | |
298 | intptr = &options->forward_x11; | |
299 | goto parse_flag; | |
300 | ||
301 | case oGatewayPorts: | |
302 | intptr = &options->gateway_ports; | |
303 | goto parse_flag; | |
304 | ||
305 | case oUsePrivilegedPort: | |
306 | intptr = &options->use_privileged_port; | |
307 | goto parse_flag; | |
308 | ||
309 | case oRhostsAuthentication: | |
310 | intptr = &options->rhosts_authentication; | |
311 | goto parse_flag; | |
312 | ||
313 | case oPasswordAuthentication: | |
314 | intptr = &options->password_authentication; | |
315 | goto parse_flag; | |
316 | ||
94ec8c6b | 317 | case oKbdInteractiveAuthentication: |
318 | intptr = &options->kbd_interactive_authentication; | |
319 | goto parse_flag; | |
320 | ||
321 | case oKbdInteractiveDevices: | |
322 | charptr = &options->kbd_interactive_devices; | |
323 | goto parse_string; | |
324 | ||
fa08c86b | 325 | case oPubkeyAuthentication: |
326 | intptr = &options->pubkey_authentication; | |
1d1ffb87 | 327 | goto parse_flag; |
328 | ||
5260325f | 329 | case oRSAAuthentication: |
330 | intptr = &options->rsa_authentication; | |
331 | goto parse_flag; | |
332 | ||
333 | case oRhostsRSAAuthentication: | |
334 | intptr = &options->rhosts_rsa_authentication; | |
335 | goto parse_flag; | |
336 | ||
8002af61 | 337 | case oHostbasedAuthentication: |
338 | intptr = &options->hostbased_authentication; | |
339 | goto parse_flag; | |
340 | ||
d464095c | 341 | case oChallengeResponseAuthentication: |
5ba55ada | 342 | intptr = &options->challenge_response_authentication; |
5260325f | 343 | goto parse_flag; |
ced49be2 | 344 | #if defined(KRB4) || defined(KRB5) |
5260325f | 345 | case oKerberosAuthentication: |
346 | intptr = &options->kerberos_authentication; | |
347 | goto parse_flag; | |
ced49be2 | 348 | #endif |
349 | #if defined(AFS) || defined(KRB5) | |
5260325f | 350 | case oKerberosTgtPassing: |
351 | intptr = &options->kerberos_tgt_passing; | |
352 | goto parse_flag; | |
ced49be2 | 353 | #endif |
354 | #ifdef AFS | |
5260325f | 355 | case oAFSTokenPassing: |
356 | intptr = &options->afs_token_passing; | |
357 | goto parse_flag; | |
8efc0c15 | 358 | #endif |
5260325f | 359 | case oFallBackToRsh: |
360 | intptr = &options->fallback_to_rsh; | |
361 | goto parse_flag; | |
362 | ||
363 | case oUseRsh: | |
364 | intptr = &options->use_rsh; | |
365 | goto parse_flag; | |
366 | ||
367 | case oBatchMode: | |
368 | intptr = &options->batch_mode; | |
369 | goto parse_flag; | |
370 | ||
371 | case oCheckHostIP: | |
372 | intptr = &options->check_host_ip; | |
373 | goto parse_flag; | |
374 | ||
375 | case oStrictHostKeyChecking: | |
376 | intptr = &options->strict_host_key_checking; | |
704b1659 | 377 | arg = strdelim(&s); |
089fbbd2 | 378 | if (!arg || *arg == '\0') |
c76c8819 | 379 | fatal("%.200s line %d: Missing yes/no/ask argument.", |
5260325f | 380 | filename, linenum); |
381 | value = 0; /* To avoid compiler warning... */ | |
089fbbd2 | 382 | if (strcmp(arg, "yes") == 0 || strcmp(arg, "true") == 0) |
5260325f | 383 | value = 1; |
089fbbd2 | 384 | else if (strcmp(arg, "no") == 0 || strcmp(arg, "false") == 0) |
5260325f | 385 | value = 0; |
089fbbd2 | 386 | else if (strcmp(arg, "ask") == 0) |
5260325f | 387 | value = 2; |
388 | else | |
389 | fatal("%.200s line %d: Bad yes/no/ask argument.", filename, linenum); | |
390 | if (*activep && *intptr == -1) | |
391 | *intptr = value; | |
392 | break; | |
393 | ||
394 | case oCompression: | |
395 | intptr = &options->compression; | |
396 | goto parse_flag; | |
397 | ||
398 | case oKeepAlives: | |
399 | intptr = &options->keepalives; | |
400 | goto parse_flag; | |
401 | ||
402 | case oNumberOfPasswordPrompts: | |
403 | intptr = &options->number_of_password_prompts; | |
404 | goto parse_int; | |
405 | ||
406 | case oCompressionLevel: | |
407 | intptr = &options->compression_level; | |
408 | goto parse_int; | |
409 | ||
410 | case oIdentityFile: | |
704b1659 | 411 | arg = strdelim(&s); |
089fbbd2 | 412 | if (!arg || *arg == '\0') |
5260325f | 413 | fatal("%.200s line %d: Missing argument.", filename, linenum); |
414 | if (*activep) { | |
fa08c86b | 415 | intptr = &options->num_identity_files; |
a306f2dd | 416 | if (*intptr >= SSH_MAX_IDENTITY_FILES) |
5260325f | 417 | fatal("%.200s line %d: Too many identity files specified (max %d).", |
418 | filename, linenum, SSH_MAX_IDENTITY_FILES); | |
fa08c86b | 419 | charptr = &options->identity_files[*intptr]; |
089fbbd2 | 420 | *charptr = xstrdup(arg); |
a306f2dd | 421 | *intptr = *intptr + 1; |
5260325f | 422 | } |
423 | break; | |
424 | ||
fa649821 | 425 | case oXAuthLocation: |
426 | charptr=&options->xauth_location; | |
427 | goto parse_string; | |
428 | ||
5260325f | 429 | case oUser: |
430 | charptr = &options->user; | |
431 | parse_string: | |
704b1659 | 432 | arg = strdelim(&s); |
089fbbd2 | 433 | if (!arg || *arg == '\0') |
5260325f | 434 | fatal("%.200s line %d: Missing argument.", filename, linenum); |
435 | if (*activep && *charptr == NULL) | |
089fbbd2 | 436 | *charptr = xstrdup(arg); |
5260325f | 437 | break; |
438 | ||
439 | case oGlobalKnownHostsFile: | |
440 | charptr = &options->system_hostfile; | |
441 | goto parse_string; | |
442 | ||
443 | case oUserKnownHostsFile: | |
444 | charptr = &options->user_hostfile; | |
445 | goto parse_string; | |
446 | ||
a306f2dd | 447 | case oGlobalKnownHostsFile2: |
448 | charptr = &options->system_hostfile2; | |
449 | goto parse_string; | |
450 | ||
451 | case oUserKnownHostsFile2: | |
452 | charptr = &options->user_hostfile2; | |
453 | goto parse_string; | |
454 | ||
5260325f | 455 | case oHostName: |
456 | charptr = &options->hostname; | |
457 | goto parse_string; | |
458 | ||
8abcdba4 | 459 | case oHostKeyAlias: |
460 | charptr = &options->host_key_alias; | |
461 | goto parse_string; | |
462 | ||
cab80f75 | 463 | case oPreferredAuthentications: |
464 | charptr = &options->preferred_authentications; | |
465 | goto parse_string; | |
466 | ||
3435f5a6 | 467 | case oBindAddress: |
468 | charptr = &options->bind_address; | |
469 | goto parse_string; | |
470 | ||
5260325f | 471 | case oProxyCommand: |
472 | charptr = &options->proxy_command; | |
704b1659 | 473 | while ((arg = strdelim(&s)) != NULL && *arg != '\0') { |
089fbbd2 | 474 | string = xrealloc(string, strlen(string) + strlen(arg) + 2); |
5260325f | 475 | strcat(string, " "); |
089fbbd2 | 476 | strcat(string, arg); |
5260325f | 477 | } |
478 | if (*activep && *charptr == NULL) | |
479 | *charptr = string; | |
480 | else | |
481 | xfree(string); | |
482 | return 0; | |
483 | ||
484 | case oPort: | |
485 | intptr = &options->port; | |
486 | parse_int: | |
704b1659 | 487 | arg = strdelim(&s); |
089fbbd2 | 488 | if (!arg || *arg == '\0') |
5260325f | 489 | fatal("%.200s line %d: Missing argument.", filename, linenum); |
089fbbd2 | 490 | if (arg[0] < '0' || arg[0] > '9') |
5260325f | 491 | fatal("%.200s line %d: Bad number.", filename, linenum); |
aa3378df | 492 | |
493 | /* Octal, decimal, or hex format? */ | |
089fbbd2 | 494 | value = strtol(arg, &endofnumber, 0); |
495 | if (arg == endofnumber) | |
aa3378df | 496 | fatal("%.200s line %d: Bad number.", filename, linenum); |
5260325f | 497 | if (*activep && *intptr == -1) |
498 | *intptr = value; | |
499 | break; | |
500 | ||
501 | case oConnectionAttempts: | |
502 | intptr = &options->connection_attempts; | |
503 | goto parse_int; | |
504 | ||
505 | case oCipher: | |
506 | intptr = &options->cipher; | |
704b1659 | 507 | arg = strdelim(&s); |
089fbbd2 | 508 | if (!arg || *arg == '\0') |
71276795 | 509 | fatal("%.200s line %d: Missing argument.", filename, linenum); |
089fbbd2 | 510 | value = cipher_number(arg); |
5260325f | 511 | if (value == -1) |
512 | fatal("%.200s line %d: Bad cipher '%s'.", | |
089fbbd2 | 513 | filename, linenum, arg ? arg : "<NONE>"); |
5260325f | 514 | if (*activep && *intptr == -1) |
515 | *intptr = value; | |
516 | break; | |
517 | ||
a8be9f80 | 518 | case oCiphers: |
704b1659 | 519 | arg = strdelim(&s); |
089fbbd2 | 520 | if (!arg || *arg == '\0') |
71276795 | 521 | fatal("%.200s line %d: Missing argument.", filename, linenum); |
089fbbd2 | 522 | if (!ciphers_valid(arg)) |
d0c832f3 | 523 | fatal("%.200s line %d: Bad SSH2 cipher spec '%s'.", |
089fbbd2 | 524 | filename, linenum, arg ? arg : "<NONE>"); |
a8be9f80 | 525 | if (*activep && options->ciphers == NULL) |
089fbbd2 | 526 | options->ciphers = xstrdup(arg); |
a8be9f80 | 527 | break; |
528 | ||
b2552997 | 529 | case oMacs: |
530 | arg = strdelim(&s); | |
531 | if (!arg || *arg == '\0') | |
532 | fatal("%.200s line %d: Missing argument.", filename, linenum); | |
533 | if (!mac_valid(arg)) | |
534 | fatal("%.200s line %d: Bad SSH2 Mac spec '%s'.", | |
535 | filename, linenum, arg ? arg : "<NONE>"); | |
536 | if (*activep && options->macs == NULL) | |
537 | options->macs = xstrdup(arg); | |
538 | break; | |
539 | ||
e961a8f9 | 540 | case oHostKeyAlgorithms: |
541 | arg = strdelim(&s); | |
542 | if (!arg || *arg == '\0') | |
543 | fatal("%.200s line %d: Missing argument.", filename, linenum); | |
544 | if (!key_names_valid2(arg)) | |
545 | fatal("%.200s line %d: Bad protocol 2 host key algorithms '%s'.", | |
546 | filename, linenum, arg ? arg : "<NONE>"); | |
547 | if (*activep && options->hostkeyalgorithms == NULL) | |
548 | options->hostkeyalgorithms = xstrdup(arg); | |
549 | break; | |
550 | ||
a8be9f80 | 551 | case oProtocol: |
552 | intptr = &options->protocol; | |
704b1659 | 553 | arg = strdelim(&s); |
089fbbd2 | 554 | if (!arg || *arg == '\0') |
71276795 | 555 | fatal("%.200s line %d: Missing argument.", filename, linenum); |
089fbbd2 | 556 | value = proto_spec(arg); |
a8be9f80 | 557 | if (value == SSH_PROTO_UNKNOWN) |
558 | fatal("%.200s line %d: Bad protocol spec '%s'.", | |
089fbbd2 | 559 | filename, linenum, arg ? arg : "<NONE>"); |
a8be9f80 | 560 | if (*activep && *intptr == SSH_PROTO_UNKNOWN) |
561 | *intptr = value; | |
562 | break; | |
563 | ||
5260325f | 564 | case oLogLevel: |
565 | intptr = (int *) &options->log_level; | |
704b1659 | 566 | arg = strdelim(&s); |
089fbbd2 | 567 | value = log_level_number(arg); |
5260325f | 568 | if (value == (LogLevel) - 1) |
54b974dc | 569 | fatal("%.200s line %d: unsupported log level '%s'", |
089fbbd2 | 570 | filename, linenum, arg ? arg : "<NONE>"); |
5260325f | 571 | if (*activep && (LogLevel) * intptr == -1) |
572 | *intptr = (LogLevel) value; | |
573 | break; | |
574 | ||
575 | case oRemoteForward: | |
704b1659 | 576 | arg = strdelim(&s); |
089fbbd2 | 577 | if (!arg || *arg == '\0') |
5260325f | 578 | fatal("%.200s line %d: Missing argument.", filename, linenum); |
2d2a2c65 | 579 | fwd_port = a2port(arg); |
580 | if (fwd_port == 0) | |
5260325f | 581 | fatal("%.200s line %d: Badly formatted port number.", |
582 | filename, linenum); | |
704b1659 | 583 | arg = strdelim(&s); |
089fbbd2 | 584 | if (!arg || *arg == '\0') |
5260325f | 585 | fatal("%.200s line %d: Missing second argument.", |
586 | filename, linenum); | |
089fbbd2 | 587 | if (sscanf(arg, "%255[^:]:%hu", buf, &fwd_host_port) != 2) |
5260325f | 588 | fatal("%.200s line %d: Badly formatted host:port.", |
589 | filename, linenum); | |
590 | if (*activep) | |
591 | add_remote_forward(options, fwd_port, buf, fwd_host_port); | |
592 | break; | |
593 | ||
594 | case oLocalForward: | |
704b1659 | 595 | arg = strdelim(&s); |
089fbbd2 | 596 | if (!arg || *arg == '\0') |
5260325f | 597 | fatal("%.200s line %d: Missing argument.", filename, linenum); |
2d2a2c65 | 598 | fwd_port = a2port(arg); |
599 | if (fwd_port == 0) | |
5260325f | 600 | fatal("%.200s line %d: Badly formatted port number.", |
601 | filename, linenum); | |
704b1659 | 602 | arg = strdelim(&s); |
089fbbd2 | 603 | if (!arg || *arg == '\0') |
5260325f | 604 | fatal("%.200s line %d: Missing second argument.", |
605 | filename, linenum); | |
089fbbd2 | 606 | if (sscanf(arg, "%255[^:]:%hu", buf, &fwd_host_port) != 2) |
5260325f | 607 | fatal("%.200s line %d: Badly formatted host:port.", |
608 | filename, linenum); | |
609 | if (*activep) | |
610 | add_local_forward(options, fwd_port, buf, fwd_host_port); | |
611 | break; | |
612 | ||
0490e609 | 613 | case oDynamicForward: |
614 | arg = strdelim(&s); | |
615 | if (!arg || *arg == '\0') | |
616 | fatal("%.200s line %d: Missing port argument.", | |
617 | filename, linenum); | |
2d2a2c65 | 618 | fwd_port = a2port(arg); |
619 | if (fwd_port == 0) | |
0490e609 | 620 | fatal("%.200s line %d: Badly formatted port number.", |
621 | filename, linenum); | |
0490e609 | 622 | add_local_forward(options, fwd_port, "socks4", 0); |
8002af61 | 623 | break; |
0490e609 | 624 | |
5260325f | 625 | case oHost: |
626 | *activep = 0; | |
704b1659 | 627 | while ((arg = strdelim(&s)) != NULL && *arg != '\0') |
089fbbd2 | 628 | if (match_pattern(host, arg)) { |
629 | debug("Applying options for %.100s", arg); | |
5260325f | 630 | *activep = 1; |
631 | break; | |
632 | } | |
704b1659 | 633 | /* Avoid garbage check below, as strdelim is done. */ |
5260325f | 634 | return 0; |
635 | ||
636 | case oEscapeChar: | |
637 | intptr = &options->escape_char; | |
704b1659 | 638 | arg = strdelim(&s); |
089fbbd2 | 639 | if (!arg || *arg == '\0') |
5260325f | 640 | fatal("%.200s line %d: Missing argument.", filename, linenum); |
089fbbd2 | 641 | if (arg[0] == '^' && arg[2] == 0 && |
1e3b8b07 | 642 | (u_char) arg[1] >= 64 && (u_char) arg[1] < 128) |
643 | value = (u_char) arg[1] & 31; | |
089fbbd2 | 644 | else if (strlen(arg) == 1) |
1e3b8b07 | 645 | value = (u_char) arg[0]; |
089fbbd2 | 646 | else if (strcmp(arg, "none") == 0) |
4bf9c10e | 647 | value = SSH_ESCAPECHAR_NONE; |
5260325f | 648 | else { |
649 | fatal("%.200s line %d: Bad escape character.", | |
650 | filename, linenum); | |
651 | /* NOTREACHED */ | |
652 | value = 0; /* Avoid compiler warning. */ | |
653 | } | |
654 | if (*activep && *intptr == -1) | |
655 | *intptr = value; | |
656 | break; | |
657 | ||
658 | default: | |
659 | fatal("process_config_line: Unimplemented opcode %d", opcode); | |
660 | } | |
661 | ||
662 | /* Check that there is no garbage at end of line. */ | |
42f11eb2 | 663 | if ((arg = strdelim(&s)) != NULL && *arg != '\0') { |
089fbbd2 | 664 | fatal("%.200s line %d: garbage at end of line; \"%.200s\".", |
665 | filename, linenum, arg); | |
666 | } | |
5260325f | 667 | return 0; |
8efc0c15 | 668 | } |
669 | ||
670 | ||
aa3378df | 671 | /* |
672 | * Reads the config file and modifies the options accordingly. Options | |
673 | * should already be initialized before this call. This never returns if | |
674 | * there is an error. If the file does not exist, this returns immediately. | |
675 | */ | |
8efc0c15 | 676 | |
6ae2364d | 677 | void |
5260325f | 678 | read_config_file(const char *filename, const char *host, Options *options) |
8efc0c15 | 679 | { |
5260325f | 680 | FILE *f; |
681 | char line[1024]; | |
682 | int active, linenum; | |
683 | int bad_options = 0; | |
684 | ||
685 | /* Open the file. */ | |
686 | f = fopen(filename, "r"); | |
687 | if (!f) | |
688 | return; | |
689 | ||
690 | debug("Reading configuration data %.200s", filename); | |
691 | ||
aa3378df | 692 | /* |
693 | * Mark that we are now processing the options. This flag is turned | |
694 | * on/off by Host specifications. | |
695 | */ | |
5260325f | 696 | active = 1; |
697 | linenum = 0; | |
698 | while (fgets(line, sizeof(line), f)) { | |
699 | /* Update line number counter. */ | |
700 | linenum++; | |
701 | if (process_config_line(options, host, line, filename, linenum, &active) != 0) | |
702 | bad_options++; | |
703 | } | |
704 | fclose(f); | |
705 | if (bad_options > 0) | |
54b974dc | 706 | fatal("%s: terminating, %d bad configuration options", |
5260325f | 707 | filename, bad_options); |
8efc0c15 | 708 | } |
709 | ||
aa3378df | 710 | /* |
711 | * Initializes options to special values that indicate that they have not yet | |
712 | * been set. Read_config_file will only set options with this value. Options | |
713 | * are processed in the following order: command line, user config file, | |
714 | * system config file. Last, fill_default_options is called. | |
715 | */ | |
8efc0c15 | 716 | |
6ae2364d | 717 | void |
5260325f | 718 | initialize_options(Options * options) |
8efc0c15 | 719 | { |
5260325f | 720 | memset(options, 'X', sizeof(*options)); |
721 | options->forward_agent = -1; | |
722 | options->forward_x11 = -1; | |
fa649821 | 723 | options->xauth_location = NULL; |
5260325f | 724 | options->gateway_ports = -1; |
725 | options->use_privileged_port = -1; | |
726 | options->rhosts_authentication = -1; | |
727 | options->rsa_authentication = -1; | |
fa08c86b | 728 | options->pubkey_authentication = -1; |
5ba55ada | 729 | options->challenge_response_authentication = -1; |
ced49be2 | 730 | #if defined(KRB4) || defined(KRB5) |
5260325f | 731 | options->kerberos_authentication = -1; |
8efc0c15 | 732 | #endif |
ced49be2 | 733 | #if defined(AFS) || defined(KRB5) |
5260325f | 734 | options->kerberos_tgt_passing = -1; |
ced49be2 | 735 | #endif |
736 | #ifdef AFS | |
5260325f | 737 | options->afs_token_passing = -1; |
8efc0c15 | 738 | #endif |
5260325f | 739 | options->password_authentication = -1; |
94ec8c6b | 740 | options->kbd_interactive_authentication = -1; |
741 | options->kbd_interactive_devices = NULL; | |
5260325f | 742 | options->rhosts_rsa_authentication = -1; |
8002af61 | 743 | options->hostbased_authentication = -1; |
5260325f | 744 | options->fallback_to_rsh = -1; |
745 | options->use_rsh = -1; | |
746 | options->batch_mode = -1; | |
747 | options->check_host_ip = -1; | |
748 | options->strict_host_key_checking = -1; | |
749 | options->compression = -1; | |
750 | options->keepalives = -1; | |
751 | options->compression_level = -1; | |
752 | options->port = -1; | |
753 | options->connection_attempts = -1; | |
754 | options->number_of_password_prompts = -1; | |
755 | options->cipher = -1; | |
a8be9f80 | 756 | options->ciphers = NULL; |
b2552997 | 757 | options->macs = NULL; |
e961a8f9 | 758 | options->hostkeyalgorithms = NULL; |
a8be9f80 | 759 | options->protocol = SSH_PROTO_UNKNOWN; |
5260325f | 760 | options->num_identity_files = 0; |
761 | options->hostname = NULL; | |
8abcdba4 | 762 | options->host_key_alias = NULL; |
5260325f | 763 | options->proxy_command = NULL; |
764 | options->user = NULL; | |
765 | options->escape_char = -1; | |
766 | options->system_hostfile = NULL; | |
767 | options->user_hostfile = NULL; | |
a306f2dd | 768 | options->system_hostfile2 = NULL; |
769 | options->user_hostfile2 = NULL; | |
5260325f | 770 | options->num_local_forwards = 0; |
771 | options->num_remote_forwards = 0; | |
772 | options->log_level = (LogLevel) - 1; | |
cab80f75 | 773 | options->preferred_authentications = NULL; |
3435f5a6 | 774 | options->bind_address = NULL; |
8efc0c15 | 775 | } |
776 | ||
aa3378df | 777 | /* |
778 | * Called after processing other sources of option data, this fills those | |
779 | * options for which no value has been specified with their default values. | |
780 | */ | |
8efc0c15 | 781 | |
6ae2364d | 782 | void |
5260325f | 783 | fill_default_options(Options * options) |
8efc0c15 | 784 | { |
d2c46e77 | 785 | int len; |
786 | ||
5260325f | 787 | if (options->forward_agent == -1) |
71276795 | 788 | options->forward_agent = 0; |
5260325f | 789 | if (options->forward_x11 == -1) |
c8d54615 | 790 | options->forward_x11 = 0; |
fd9ede94 | 791 | #ifdef _PATH_XAUTH |
fa649821 | 792 | if (options->xauth_location == NULL) |
fd9ede94 | 793 | options->xauth_location = _PATH_XAUTH; |
794 | #endif | |
5260325f | 795 | if (options->gateway_ports == -1) |
796 | options->gateway_ports = 0; | |
797 | if (options->use_privileged_port == -1) | |
d5ebca2b | 798 | options->use_privileged_port = 0; |
5260325f | 799 | if (options->rhosts_authentication == -1) |
800 | options->rhosts_authentication = 1; | |
801 | if (options->rsa_authentication == -1) | |
802 | options->rsa_authentication = 1; | |
fa08c86b | 803 | if (options->pubkey_authentication == -1) |
804 | options->pubkey_authentication = 1; | |
5ba55ada | 805 | if (options->challenge_response_authentication == -1) |
10a2cbef | 806 | options->challenge_response_authentication = 1; |
ced49be2 | 807 | #if defined(KRB4) || defined(KRB5) |
5260325f | 808 | if (options->kerberos_authentication == -1) |
809 | options->kerberos_authentication = 1; | |
ced49be2 | 810 | #endif |
811 | #if defined(AFS) || defined(KRB5) | |
5260325f | 812 | if (options->kerberos_tgt_passing == -1) |
813 | options->kerberos_tgt_passing = 1; | |
ced49be2 | 814 | #endif |
815 | #ifdef AFS | |
5260325f | 816 | if (options->afs_token_passing == -1) |
817 | options->afs_token_passing = 1; | |
ced49be2 | 818 | #endif |
5260325f | 819 | if (options->password_authentication == -1) |
820 | options->password_authentication = 1; | |
94ec8c6b | 821 | if (options->kbd_interactive_authentication == -1) |
d464095c | 822 | options->kbd_interactive_authentication = 1; |
5260325f | 823 | if (options->rhosts_rsa_authentication == -1) |
824 | options->rhosts_rsa_authentication = 1; | |
8002af61 | 825 | if (options->hostbased_authentication == -1) |
826 | options->hostbased_authentication = 0; | |
5260325f | 827 | if (options->fallback_to_rsh == -1) |
3f7a7e4a | 828 | options->fallback_to_rsh = 0; |
5260325f | 829 | if (options->use_rsh == -1) |
830 | options->use_rsh = 0; | |
831 | if (options->batch_mode == -1) | |
832 | options->batch_mode = 0; | |
833 | if (options->check_host_ip == -1) | |
834 | options->check_host_ip = 1; | |
835 | if (options->strict_host_key_checking == -1) | |
836 | options->strict_host_key_checking = 2; /* 2 is default */ | |
837 | if (options->compression == -1) | |
838 | options->compression = 0; | |
839 | if (options->keepalives == -1) | |
840 | options->keepalives = 1; | |
841 | if (options->compression_level == -1) | |
842 | options->compression_level = 6; | |
843 | if (options->port == -1) | |
844 | options->port = 0; /* Filled in ssh_connect. */ | |
845 | if (options->connection_attempts == -1) | |
846 | options->connection_attempts = 4; | |
847 | if (options->number_of_password_prompts == -1) | |
848 | options->number_of_password_prompts = 3; | |
849 | /* Selected in ssh_login(). */ | |
850 | if (options->cipher == -1) | |
851 | options->cipher = SSH_CIPHER_NOT_SET; | |
d0c832f3 | 852 | /* options->ciphers, default set in myproposals.h */ |
b2552997 | 853 | /* options->macs, default set in myproposals.h */ |
e961a8f9 | 854 | /* options->hostkeyalgorithms, default set in myproposals.h */ |
a8be9f80 | 855 | if (options->protocol == SSH_PROTO_UNKNOWN) |
3e587cc3 | 856 | options->protocol = SSH_PROTO_1|SSH_PROTO_2; |
5260325f | 857 | if (options->num_identity_files == 0) { |
fa08c86b | 858 | if (options->protocol & SSH_PROTO_1) { |
d2c46e77 | 859 | len = 2 + strlen(_PATH_SSH_CLIENT_IDENTITY) + 1; |
fa08c86b | 860 | options->identity_files[options->num_identity_files] = |
d2c46e77 | 861 | xmalloc(len); |
862 | snprintf(options->identity_files[options->num_identity_files++], | |
863 | len, "~/%.100s", _PATH_SSH_CLIENT_IDENTITY); | |
fa08c86b | 864 | } |
865 | if (options->protocol & SSH_PROTO_2) { | |
ec63b02d | 866 | len = 2 + strlen(_PATH_SSH_CLIENT_ID_RSA) + 1; |
867 | options->identity_files[options->num_identity_files] = | |
868 | xmalloc(len); | |
869 | snprintf(options->identity_files[options->num_identity_files++], | |
870 | len, "~/%.100s", _PATH_SSH_CLIENT_ID_RSA); | |
871 | ||
d2c46e77 | 872 | len = 2 + strlen(_PATH_SSH_CLIENT_ID_DSA) + 1; |
fa08c86b | 873 | options->identity_files[options->num_identity_files] = |
d2c46e77 | 874 | xmalloc(len); |
875 | snprintf(options->identity_files[options->num_identity_files++], | |
876 | len, "~/%.100s", _PATH_SSH_CLIENT_ID_DSA); | |
fa08c86b | 877 | } |
a306f2dd | 878 | } |
5260325f | 879 | if (options->escape_char == -1) |
880 | options->escape_char = '~'; | |
881 | if (options->system_hostfile == NULL) | |
42f11eb2 | 882 | options->system_hostfile = _PATH_SSH_SYSTEM_HOSTFILE; |
5260325f | 883 | if (options->user_hostfile == NULL) |
42f11eb2 | 884 | options->user_hostfile = _PATH_SSH_USER_HOSTFILE; |
a306f2dd | 885 | if (options->system_hostfile2 == NULL) |
42f11eb2 | 886 | options->system_hostfile2 = _PATH_SSH_SYSTEM_HOSTFILE2; |
a306f2dd | 887 | if (options->user_hostfile2 == NULL) |
42f11eb2 | 888 | options->user_hostfile2 = _PATH_SSH_USER_HOSTFILE2; |
5260325f | 889 | if (options->log_level == (LogLevel) - 1) |
59c97189 | 890 | options->log_level = SYSLOG_LEVEL_INFO; |
5260325f | 891 | /* options->proxy_command should not be set by default */ |
892 | /* options->user will be set in the main program if appropriate */ | |
893 | /* options->hostname will be set in the main program if appropriate */ | |
8abcdba4 | 894 | /* options->host_key_alias should not be set by default */ |
cab80f75 | 895 | /* options->preferred_authentications will be set in ssh */ |
8efc0c15 | 896 | } |