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Commit | Line | Data |
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8efc0c15 | 1 | /* |
2 | ||
3 | servconf.c | |
4 | ||
5 | Author: Tatu Ylonen <ylo@cs.hut.fi> | |
6 | ||
7 | Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland | |
8 | All rights reserved | |
9 | ||
10 | Created: Mon Aug 21 15:48:58 1995 ylo | |
11 | ||
12 | */ | |
13 | ||
14 | #include "includes.h" | |
15 | RCSID("$Id$"); | |
16 | ||
17 | #include "ssh.h" | |
18 | #include "servconf.h" | |
19 | #include "xmalloc.h" | |
20 | ||
21 | /* Initializes the server options to their default values. */ | |
22 | ||
23 | void initialize_server_options(ServerOptions *options) | |
24 | { | |
25 | memset(options, 0, sizeof(*options)); | |
26 | options->port = -1; | |
27 | options->listen_addr.s_addr = htonl(INADDR_ANY); | |
28 | options->host_key_file = NULL; | |
29 | options->server_key_bits = -1; | |
30 | options->login_grace_time = -1; | |
31 | options->key_regeneration_time = -1; | |
32 | options->permit_root_login = -1; | |
33 | options->ignore_rhosts = -1; | |
b4748e2f | 34 | options->ignore_user_known_hosts = -1; |
8efc0c15 | 35 | options->print_motd = -1; |
36 | options->check_mail = -1; | |
37 | options->x11_forwarding = -1; | |
38 | options->x11_display_offset = -1; | |
39 | options->strict_modes = -1; | |
40 | options->keepalives = -1; | |
41 | options->log_facility = (SyslogFacility)-1; | |
6a17f9c2 | 42 | options->log_level = (LogLevel)-1; |
8efc0c15 | 43 | options->rhosts_authentication = -1; |
44 | options->rhosts_rsa_authentication = -1; | |
45 | options->rsa_authentication = -1; | |
46 | #ifdef KRB4 | |
47 | options->kerberos_authentication = -1; | |
48 | options->kerberos_or_local_passwd = -1; | |
49 | options->kerberos_ticket_cleanup = -1; | |
50 | #endif | |
51 | #ifdef AFS | |
52 | options->kerberos_tgt_passing = -1; | |
53 | options->afs_token_passing = -1; | |
54 | #endif | |
55 | options->password_authentication = -1; | |
56 | #ifdef SKEY | |
57 | options->skey_authentication = -1; | |
58 | #endif | |
59 | options->permit_empty_passwd = -1; | |
60 | options->use_login = -1; | |
61 | options->num_allow_users = 0; | |
62 | options->num_deny_users = 0; | |
63 | options->num_allow_groups = 0; | |
64 | options->num_deny_groups = 0; | |
65 | } | |
66 | ||
67 | void fill_default_server_options(ServerOptions *options) | |
68 | { | |
69 | if (options->port == -1) | |
70 | { | |
71 | struct servent *sp; | |
72 | ||
73 | sp = getservbyname(SSH_SERVICE_NAME, "tcp"); | |
74 | if (sp) | |
75 | options->port = ntohs(sp->s_port); | |
76 | else | |
77 | options->port = SSH_DEFAULT_PORT; | |
78 | endservent(); | |
79 | } | |
80 | if (options->host_key_file == NULL) | |
81 | options->host_key_file = HOST_KEY_FILE; | |
82 | if (options->server_key_bits == -1) | |
83 | options->server_key_bits = 768; | |
84 | if (options->login_grace_time == -1) | |
85 | options->login_grace_time = 600; | |
86 | if (options->key_regeneration_time == -1) | |
87 | options->key_regeneration_time = 3600; | |
88 | if (options->permit_root_login == -1) | |
89 | options->permit_root_login = 1; /* yes */ | |
90 | if (options->ignore_rhosts == -1) | |
91 | options->ignore_rhosts = 0; | |
b4748e2f | 92 | if (options->ignore_user_known_hosts == -1) |
93 | options->ignore_user_known_hosts = 0; | |
8efc0c15 | 94 | if (options->check_mail == -1) |
95 | options->check_mail = 0; | |
8efc0c15 | 96 | if (options->print_motd == -1) |
97 | options->print_motd = 1; | |
98 | if (options->x11_forwarding == -1) | |
99 | options->x11_forwarding = 1; | |
100 | if (options->x11_display_offset == -1) | |
101 | options->x11_display_offset = 1; | |
102 | if (options->strict_modes == -1) | |
103 | options->strict_modes = 1; | |
104 | if (options->keepalives == -1) | |
105 | options->keepalives = 1; | |
106 | if (options->log_facility == (SyslogFacility)(-1)) | |
107 | options->log_facility = SYSLOG_FACILITY_AUTH; | |
6a17f9c2 | 108 | if (options->log_level == (LogLevel)(-1)) |
109 | options->log_level = SYSLOG_LEVEL_INFO; | |
8efc0c15 | 110 | if (options->rhosts_authentication == -1) |
111 | options->rhosts_authentication = 0; | |
112 | if (options->rhosts_rsa_authentication == -1) | |
113 | options->rhosts_rsa_authentication = 1; | |
114 | if (options->rsa_authentication == -1) | |
115 | options->rsa_authentication = 1; | |
116 | #ifdef KRB4 | |
117 | if (options->kerberos_authentication == -1) | |
118 | options->kerberos_authentication = (access(KEYFILE, R_OK) == 0); | |
119 | if (options->kerberos_or_local_passwd == -1) | |
120 | options->kerberos_or_local_passwd = 1; | |
121 | if (options->kerberos_ticket_cleanup == -1) | |
122 | options->kerberos_ticket_cleanup = 1; | |
123 | #endif /* KRB4 */ | |
124 | #ifdef AFS | |
125 | if (options->kerberos_tgt_passing == -1) | |
126 | options->kerberos_tgt_passing = 0; | |
127 | if (options->afs_token_passing == -1) | |
128 | options->afs_token_passing = k_hasafs(); | |
129 | #endif /* AFS */ | |
130 | if (options->password_authentication == -1) | |
131 | options->password_authentication = 1; | |
132 | #ifdef SKEY | |
133 | if (options->skey_authentication == -1) | |
134 | options->skey_authentication = 1; | |
135 | #endif | |
136 | if (options->permit_empty_passwd == -1) | |
137 | options->permit_empty_passwd = 1; | |
138 | if (options->use_login == -1) | |
139 | options->use_login = 0; | |
140 | } | |
141 | ||
142 | #define WHITESPACE " \t\r\n" | |
143 | ||
144 | /* Keyword tokens. */ | |
145 | typedef enum | |
146 | { | |
6fa724bc | 147 | sBadOption, /* == unknown option */ |
8efc0c15 | 148 | sPort, sHostKeyFile, sServerKeyBits, sLoginGraceTime, sKeyRegenerationTime, |
6a17f9c2 | 149 | sPermitRootLogin, sLogFacility, sLogLevel, |
8efc0c15 | 150 | sRhostsAuthentication, sRhostsRSAAuthentication, sRSAAuthentication, |
151 | #ifdef KRB4 | |
152 | sKerberosAuthentication, sKerberosOrLocalPasswd, sKerberosTicketCleanup, | |
153 | #endif | |
154 | #ifdef AFS | |
155 | sKerberosTgtPassing, sAFSTokenPassing, | |
156 | #endif | |
157 | #ifdef SKEY | |
158 | sSkeyAuthentication, | |
159 | #endif | |
160 | sPasswordAuthentication, sListenAddress, | |
161 | sPrintMotd, sIgnoreRhosts, sX11Forwarding, sX11DisplayOffset, | |
162 | sStrictModes, sEmptyPasswd, sRandomSeedFile, sKeepAlives, sCheckMail, | |
b4748e2f | 163 | sUseLogin, sAllowUsers, sDenyUsers, sAllowGroups, sDenyGroups, |
164 | sIgnoreUserKnownHosts | |
8efc0c15 | 165 | } ServerOpCodes; |
166 | ||
167 | /* Textual representation of the tokens. */ | |
168 | static struct | |
169 | { | |
170 | const char *name; | |
171 | ServerOpCodes opcode; | |
172 | } keywords[] = | |
173 | { | |
174 | { "port", sPort }, | |
175 | { "hostkey", sHostKeyFile }, | |
176 | { "serverkeybits", sServerKeyBits }, | |
177 | { "logingracetime", sLoginGraceTime }, | |
178 | { "keyregenerationinterval", sKeyRegenerationTime }, | |
179 | { "permitrootlogin", sPermitRootLogin }, | |
8efc0c15 | 180 | { "syslogfacility", sLogFacility }, |
6a17f9c2 | 181 | { "loglevel", sLogLevel }, |
8efc0c15 | 182 | { "rhostsauthentication", sRhostsAuthentication }, |
183 | { "rhostsrsaauthentication", sRhostsRSAAuthentication }, | |
184 | { "rsaauthentication", sRSAAuthentication }, | |
185 | #ifdef KRB4 | |
186 | { "kerberosauthentication", sKerberosAuthentication }, | |
187 | { "kerberosorlocalpasswd", sKerberosOrLocalPasswd }, | |
188 | { "kerberosticketcleanup", sKerberosTicketCleanup }, | |
189 | #endif | |
190 | #ifdef AFS | |
191 | { "kerberostgtpassing", sKerberosTgtPassing }, | |
192 | { "afstokenpassing", sAFSTokenPassing }, | |
193 | #endif | |
194 | { "passwordauthentication", sPasswordAuthentication }, | |
195 | #ifdef SKEY | |
196 | { "skeyauthentication", sSkeyAuthentication }, | |
197 | #endif | |
198 | { "checkmail", sCheckMail }, | |
199 | { "listenaddress", sListenAddress }, | |
200 | { "printmotd", sPrintMotd }, | |
201 | { "ignorerhosts", sIgnoreRhosts }, | |
b4748e2f | 202 | { "ignoreuserknownhosts", sIgnoreUserKnownHosts }, |
8efc0c15 | 203 | { "x11forwarding", sX11Forwarding }, |
204 | { "x11displayoffset", sX11DisplayOffset }, | |
205 | { "strictmodes", sStrictModes }, | |
206 | { "permitemptypasswords", sEmptyPasswd }, | |
207 | { "uselogin", sUseLogin }, | |
208 | { "randomseed", sRandomSeedFile }, | |
209 | { "keepalive", sKeepAlives }, | |
210 | { "allowusers", sAllowUsers }, | |
211 | { "denyusers", sDenyUsers }, | |
212 | { "allowgroups", sAllowGroups }, | |
213 | { "denygroups", sDenyGroups }, | |
214 | { NULL, 0 } | |
215 | }; | |
216 | ||
8efc0c15 | 217 | /* Returns the number of the token pointed to by cp of length len. |
218 | Never returns if the token is not known. */ | |
219 | ||
220 | static ServerOpCodes parse_token(const char *cp, const char *filename, | |
221 | int linenum) | |
222 | { | |
223 | unsigned int i; | |
224 | ||
225 | for (i = 0; keywords[i].name; i++) | |
226 | if (strcmp(cp, keywords[i].name) == 0) | |
227 | return keywords[i].opcode; | |
228 | ||
6fa724bc | 229 | fprintf(stderr, "%s: line %d: Bad configuration option: %s\n", |
8efc0c15 | 230 | filename, linenum, cp); |
6fa724bc | 231 | return sBadOption; |
8efc0c15 | 232 | } |
233 | ||
234 | /* Reads the server configuration file. */ | |
235 | ||
236 | void read_server_config(ServerOptions *options, const char *filename) | |
237 | { | |
238 | FILE *f; | |
239 | char line[1024]; | |
240 | char *cp, **charptr; | |
9d6b7add | 241 | int linenum, *intptr, value; |
6fa724bc | 242 | int bad_options = 0; |
8efc0c15 | 243 | ServerOpCodes opcode; |
244 | ||
245 | f = fopen(filename, "r"); | |
246 | if (!f) | |
247 | { | |
248 | perror(filename); | |
249 | exit(1); | |
250 | } | |
251 | ||
252 | linenum = 0; | |
253 | while (fgets(line, sizeof(line), f)) | |
254 | { | |
255 | linenum++; | |
256 | cp = line + strspn(line, WHITESPACE); | |
257 | if (!*cp || *cp == '#') | |
258 | continue; | |
259 | cp = strtok(cp, WHITESPACE); | |
260 | { | |
261 | char *t = cp; | |
262 | for (; *t != 0; t++) | |
263 | if ('A' <= *t && *t <= 'Z') | |
264 | *t = *t - 'A' + 'a'; /* tolower */ | |
265 | ||
266 | } | |
267 | opcode = parse_token(cp, filename, linenum); | |
268 | switch (opcode) | |
269 | { | |
6fa724bc | 270 | case sBadOption: |
271 | bad_options++; | |
272 | continue; | |
8efc0c15 | 273 | case sPort: |
274 | intptr = &options->port; | |
275 | parse_int: | |
276 | cp = strtok(NULL, WHITESPACE); | |
277 | if (!cp) | |
278 | { | |
279 | fprintf(stderr, "%s line %d: missing integer value.\n", | |
280 | filename, linenum); | |
281 | exit(1); | |
282 | } | |
283 | value = atoi(cp); | |
284 | if (*intptr == -1) | |
285 | *intptr = value; | |
286 | break; | |
287 | ||
288 | case sServerKeyBits: | |
289 | intptr = &options->server_key_bits; | |
290 | goto parse_int; | |
291 | ||
292 | case sLoginGraceTime: | |
293 | intptr = &options->login_grace_time; | |
294 | goto parse_int; | |
295 | ||
296 | case sKeyRegenerationTime: | |
297 | intptr = &options->key_regeneration_time; | |
298 | goto parse_int; | |
299 | ||
300 | case sListenAddress: | |
301 | cp = strtok(NULL, WHITESPACE); | |
302 | if (!cp) | |
303 | { | |
304 | fprintf(stderr, "%s line %d: missing inet addr.\n", | |
305 | filename, linenum); | |
306 | exit(1); | |
307 | } | |
308 | options->listen_addr.s_addr = inet_addr(cp); | |
309 | break; | |
310 | ||
311 | case sHostKeyFile: | |
312 | charptr = &options->host_key_file; | |
313 | cp = strtok(NULL, WHITESPACE); | |
314 | if (!cp) | |
315 | { | |
316 | fprintf(stderr, "%s line %d: missing file name.\n", | |
317 | filename, linenum); | |
318 | exit(1); | |
319 | } | |
320 | if (*charptr == NULL) | |
321 | *charptr = tilde_expand_filename(cp, getuid()); | |
322 | break; | |
323 | ||
324 | case sRandomSeedFile: | |
325 | fprintf(stderr, "%s line %d: \"randomseed\" option is obsolete.\n", | |
326 | filename, linenum); | |
327 | cp = strtok(NULL, WHITESPACE); | |
328 | break; | |
329 | ||
330 | case sPermitRootLogin: | |
331 | intptr = &options->permit_root_login; | |
332 | cp = strtok(NULL, WHITESPACE); | |
333 | if (!cp) | |
334 | { | |
335 | fprintf(stderr, "%s line %d: missing yes/without-password/no argument.\n", | |
336 | filename, linenum); | |
337 | exit(1); | |
338 | } | |
339 | if (strcmp(cp, "without-password") == 0) | |
340 | value = 2; | |
341 | else if (strcmp(cp, "yes") == 0) | |
342 | value = 1; | |
343 | else if (strcmp(cp, "no") == 0) | |
344 | value = 0; | |
345 | else | |
346 | { | |
347 | fprintf(stderr, "%s line %d: Bad yes/without-password/no argument: %s\n", | |
348 | filename, linenum, cp); | |
349 | exit(1); | |
350 | } | |
351 | if (*intptr == -1) | |
352 | *intptr = value; | |
353 | break; | |
354 | ||
355 | case sIgnoreRhosts: | |
356 | intptr = &options->ignore_rhosts; | |
357 | parse_flag: | |
358 | cp = strtok(NULL, WHITESPACE); | |
359 | if (!cp) | |
360 | { | |
361 | fprintf(stderr, "%s line %d: missing yes/no argument.\n", | |
362 | filename, linenum); | |
363 | exit(1); | |
364 | } | |
365 | if (strcmp(cp, "yes") == 0) | |
366 | value = 1; | |
367 | else | |
368 | if (strcmp(cp, "no") == 0) | |
369 | value = 0; | |
370 | else | |
371 | { | |
372 | fprintf(stderr, "%s line %d: Bad yes/no argument: %s\n", | |
373 | filename, linenum, cp); | |
374 | exit(1); | |
375 | } | |
376 | if (*intptr == -1) | |
377 | *intptr = value; | |
378 | break; | |
b4748e2f | 379 | |
380 | case sIgnoreUserKnownHosts: | |
381 | intptr = &options->ignore_user_known_hosts; | |
382 | goto parse_int; | |
383 | ||
8efc0c15 | 384 | case sRhostsAuthentication: |
385 | intptr = &options->rhosts_authentication; | |
386 | goto parse_flag; | |
387 | ||
388 | case sRhostsRSAAuthentication: | |
389 | intptr = &options->rhosts_rsa_authentication; | |
390 | goto parse_flag; | |
391 | ||
392 | case sRSAAuthentication: | |
393 | intptr = &options->rsa_authentication; | |
394 | goto parse_flag; | |
395 | ||
396 | #ifdef KRB4 | |
397 | case sKerberosAuthentication: | |
398 | intptr = &options->kerberos_authentication; | |
399 | goto parse_flag; | |
400 | ||
401 | case sKerberosOrLocalPasswd: | |
402 | intptr = &options->kerberos_or_local_passwd; | |
403 | goto parse_flag; | |
404 | ||
405 | case sKerberosTicketCleanup: | |
406 | intptr = &options->kerberos_ticket_cleanup; | |
407 | goto parse_flag; | |
408 | #endif | |
409 | ||
410 | #ifdef AFS | |
411 | case sKerberosTgtPassing: | |
412 | intptr = &options->kerberos_tgt_passing; | |
413 | goto parse_flag; | |
414 | ||
415 | case sAFSTokenPassing: | |
416 | intptr = &options->afs_token_passing; | |
417 | goto parse_flag; | |
418 | #endif | |
419 | ||
420 | case sPasswordAuthentication: | |
421 | intptr = &options->password_authentication; | |
422 | goto parse_flag; | |
423 | ||
424 | case sCheckMail: | |
425 | intptr = &options->check_mail; | |
426 | goto parse_flag; | |
427 | ||
428 | #ifdef SKEY | |
429 | case sSkeyAuthentication: | |
430 | intptr = &options->skey_authentication; | |
431 | goto parse_flag; | |
432 | #endif | |
433 | ||
434 | case sPrintMotd: | |
435 | intptr = &options->print_motd; | |
436 | goto parse_flag; | |
437 | ||
438 | case sX11Forwarding: | |
439 | intptr = &options->x11_forwarding; | |
440 | goto parse_flag; | |
441 | ||
442 | case sX11DisplayOffset: | |
443 | intptr = &options->x11_display_offset; | |
444 | goto parse_int; | |
445 | ||
446 | case sStrictModes: | |
447 | intptr = &options->strict_modes; | |
448 | goto parse_flag; | |
449 | ||
450 | case sKeepAlives: | |
451 | intptr = &options->keepalives; | |
452 | goto parse_flag; | |
453 | ||
454 | case sEmptyPasswd: | |
455 | intptr = &options->permit_empty_passwd; | |
456 | goto parse_flag; | |
457 | ||
458 | case sUseLogin: | |
459 | intptr = &options->use_login; | |
460 | goto parse_flag; | |
461 | ||
462 | case sLogFacility: | |
9d6b7add | 463 | intptr = (int *)&options->log_facility; |
8efc0c15 | 464 | cp = strtok(NULL, WHITESPACE); |
9d6b7add | 465 | value = log_facility_number(cp); |
466 | if (value == (SyslogFacility)-1) | |
467 | fatal("%.200s line %d: unsupported log facility '%s'\n", | |
468 | filename, linenum, cp ? cp : "<NONE>"); | |
469 | if (*intptr == -1) | |
470 | *intptr = (SyslogFacility)value; | |
8efc0c15 | 471 | break; |
6a17f9c2 | 472 | |
473 | case sLogLevel: | |
9d6b7add | 474 | intptr = (int *)&options->log_level; |
6a17f9c2 | 475 | cp = strtok(NULL, WHITESPACE); |
9d6b7add | 476 | value = log_level_number(cp); |
477 | if (value == (LogLevel)-1) | |
478 | fatal("%.200s line %d: unsupported log level '%s'\n", | |
479 | filename, linenum, cp ? cp : "<NONE>"); | |
480 | if (*intptr == -1) | |
481 | *intptr = (LogLevel)value; | |
6a17f9c2 | 482 | break; |
8efc0c15 | 483 | |
484 | case sAllowUsers: | |
485 | while ((cp = strtok(NULL, WHITESPACE))) | |
486 | { | |
487 | if (options->num_allow_users >= MAX_ALLOW_USERS) | |
488 | { | |
489 | fprintf(stderr, "%s line %d: too many allow users.\n", | |
490 | filename, linenum); | |
491 | exit(1); | |
492 | } | |
493 | options->allow_users[options->num_allow_users++] = xstrdup(cp); | |
494 | } | |
495 | break; | |
496 | ||
497 | case sDenyUsers: | |
498 | while ((cp = strtok(NULL, WHITESPACE))) | |
499 | { | |
500 | if (options->num_deny_users >= MAX_DENY_USERS) | |
501 | { | |
502 | fprintf(stderr, "%s line %d: too many deny users.\n", | |
503 | filename, linenum); | |
504 | exit(1); | |
505 | } | |
506 | options->deny_users[options->num_deny_users++] = xstrdup(cp); | |
507 | } | |
508 | break; | |
509 | ||
510 | case sAllowGroups: | |
511 | while ((cp = strtok(NULL, WHITESPACE))) | |
512 | { | |
513 | if (options->num_allow_groups >= MAX_ALLOW_GROUPS) | |
514 | { | |
515 | fprintf(stderr, "%s line %d: too many allow groups.\n", | |
516 | filename, linenum); | |
517 | exit(1); | |
518 | } | |
519 | options->allow_groups[options->num_allow_groups++] = xstrdup(cp); | |
520 | } | |
521 | break; | |
522 | ||
523 | case sDenyGroups: | |
524 | while ((cp = strtok(NULL, WHITESPACE))) | |
525 | { | |
526 | if (options->num_deny_groups >= MAX_DENY_GROUPS) | |
527 | { | |
528 | fprintf(stderr, "%s line %d: too many deny groups.\n", | |
529 | filename, linenum); | |
530 | exit(1); | |
531 | } | |
532 | options->deny_groups[options->num_deny_groups++] = xstrdup(cp); | |
533 | } | |
534 | break; | |
535 | ||
536 | default: | |
537 | fprintf(stderr, "%s line %d: Missing handler for opcode %s (%d)\n", | |
538 | filename, linenum, cp, opcode); | |
539 | exit(1); | |
540 | } | |
541 | if (strtok(NULL, WHITESPACE) != NULL) | |
542 | { | |
543 | fprintf(stderr, "%s line %d: garbage at end of line.\n", | |
544 | filename, linenum); | |
545 | exit(1); | |
546 | } | |
547 | } | |
548 | fclose(f); | |
6fa724bc | 549 | if (bad_options > 0) { |
550 | fprintf(stderr, "%s: terminating, %d bad configuration options\n", | |
551 | filename, bad_options); | |
552 | exit(1); | |
553 | } | |
8efc0c15 | 554 | } |