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