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8efc0c15 1/*
2
3servconf.c
4
5Author: Tatu Ylonen <ylo@cs.hut.fi>
6
7Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
8 All rights reserved
9
10Created: Mon Aug 21 15:48:58 1995 ylo
11
12*/
13
14#include "includes.h"
15RCSID("$Id$");
16
17#include "ssh.h"
18#include "servconf.h"
19#include "xmalloc.h"
20
21/* Initializes the server options to their default values. */
22
23void 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;
34 options->quiet_mode = -1;
35 options->fascist_logging = -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->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
67void 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;
92 if (options->quiet_mode == -1)
93 options->quiet_mode = 0;
94 if (options->check_mail == -1)
95 options->check_mail = 0;
96 if (options->fascist_logging == -1)
97 options->fascist_logging = 1;
98 if (options->print_motd == -1)
99 options->print_motd = 1;
100 if (options->x11_forwarding == -1)
101 options->x11_forwarding = 1;
102 if (options->x11_display_offset == -1)
103 options->x11_display_offset = 1;
104 if (options->strict_modes == -1)
105 options->strict_modes = 1;
106 if (options->keepalives == -1)
107 options->keepalives = 1;
108 if (options->log_facility == (SyslogFacility)(-1))
109 options->log_facility = SYSLOG_FACILITY_AUTH;
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. */
145typedef enum
146{
147 sPort, sHostKeyFile, sServerKeyBits, sLoginGraceTime, sKeyRegenerationTime,
148 sPermitRootLogin, sQuietMode, sFascistLogging, sLogFacility,
149 sRhostsAuthentication, sRhostsRSAAuthentication, sRSAAuthentication,
150#ifdef KRB4
151 sKerberosAuthentication, sKerberosOrLocalPasswd, sKerberosTicketCleanup,
152#endif
153#ifdef AFS
154 sKerberosTgtPassing, sAFSTokenPassing,
155#endif
156#ifdef SKEY
157 sSkeyAuthentication,
158#endif
159 sPasswordAuthentication, sListenAddress,
160 sPrintMotd, sIgnoreRhosts, sX11Forwarding, sX11DisplayOffset,
161 sStrictModes, sEmptyPasswd, sRandomSeedFile, sKeepAlives, sCheckMail,
162 sUseLogin, sAllowUsers, sDenyUsers, sAllowGroups, sDenyGroups
163
164} ServerOpCodes;
165
166/* Textual representation of the tokens. */
167static struct
168{
169 const char *name;
170 ServerOpCodes opcode;
171} keywords[] =
172{
173 { "port", sPort },
174 { "hostkey", sHostKeyFile },
175 { "serverkeybits", sServerKeyBits },
176 { "logingracetime", sLoginGraceTime },
177 { "keyregenerationinterval", sKeyRegenerationTime },
178 { "permitrootlogin", sPermitRootLogin },
179 { "quietmode", sQuietMode },
180 { "fascistlogging", sFascistLogging },
181 { "syslogfacility", sLogFacility },
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 },
202 { "x11forwarding", sX11Forwarding },
203 { "x11displayoffset", sX11DisplayOffset },
204 { "strictmodes", sStrictModes },
205 { "permitemptypasswords", sEmptyPasswd },
206 { "uselogin", sUseLogin },
207 { "randomseed", sRandomSeedFile },
208 { "keepalive", sKeepAlives },
209 { "allowusers", sAllowUsers },
210 { "denyusers", sDenyUsers },
211 { "allowgroups", sAllowGroups },
212 { "denygroups", sDenyGroups },
213 { NULL, 0 }
214};
215
216static struct
217{
218 const char *name;
219 SyslogFacility facility;
220} log_facilities[] =
221{
222 { "DAEMON", SYSLOG_FACILITY_DAEMON },
223 { "USER", SYSLOG_FACILITY_USER },
224 { "AUTH", SYSLOG_FACILITY_AUTH },
225 { "LOCAL0", SYSLOG_FACILITY_LOCAL0 },
226 { "LOCAL1", SYSLOG_FACILITY_LOCAL1 },
227 { "LOCAL2", SYSLOG_FACILITY_LOCAL2 },
228 { "LOCAL3", SYSLOG_FACILITY_LOCAL3 },
229 { "LOCAL4", SYSLOG_FACILITY_LOCAL4 },
230 { "LOCAL5", SYSLOG_FACILITY_LOCAL5 },
231 { "LOCAL6", SYSLOG_FACILITY_LOCAL6 },
232 { "LOCAL7", SYSLOG_FACILITY_LOCAL7 },
233 { NULL, 0 }
234};
235
236/* Returns the number of the token pointed to by cp of length len.
237 Never returns if the token is not known. */
238
239static ServerOpCodes parse_token(const char *cp, const char *filename,
240 int linenum)
241{
242 unsigned int i;
243
244 for (i = 0; keywords[i].name; i++)
245 if (strcmp(cp, keywords[i].name) == 0)
246 return keywords[i].opcode;
247
248 fprintf(stderr, "%s line %d: Bad configuration option: %s\n",
249 filename, linenum, cp);
250 exit(1);
251}
252
253/* Reads the server configuration file. */
254
255void read_server_config(ServerOptions *options, const char *filename)
256{
257 FILE *f;
258 char line[1024];
259 char *cp, **charptr;
260 int linenum, *intptr, i, value;
261 ServerOpCodes opcode;
262
263 f = fopen(filename, "r");
264 if (!f)
265 {
266 perror(filename);
267 exit(1);
268 }
269
270 linenum = 0;
271 while (fgets(line, sizeof(line), f))
272 {
273 linenum++;
274 cp = line + strspn(line, WHITESPACE);
275 if (!*cp || *cp == '#')
276 continue;
277 cp = strtok(cp, WHITESPACE);
278 {
279 char *t = cp;
280 for (; *t != 0; t++)
281 if ('A' <= *t && *t <= 'Z')
282 *t = *t - 'A' + 'a'; /* tolower */
283
284 }
285 opcode = parse_token(cp, filename, linenum);
286 switch (opcode)
287 {
288 case sPort:
289 intptr = &options->port;
290 parse_int:
291 cp = strtok(NULL, WHITESPACE);
292 if (!cp)
293 {
294 fprintf(stderr, "%s line %d: missing integer value.\n",
295 filename, linenum);
296 exit(1);
297 }
298 value = atoi(cp);
299 if (*intptr == -1)
300 *intptr = value;
301 break;
302
303 case sServerKeyBits:
304 intptr = &options->server_key_bits;
305 goto parse_int;
306
307 case sLoginGraceTime:
308 intptr = &options->login_grace_time;
309 goto parse_int;
310
311 case sKeyRegenerationTime:
312 intptr = &options->key_regeneration_time;
313 goto parse_int;
314
315 case sListenAddress:
316 cp = strtok(NULL, WHITESPACE);
317 if (!cp)
318 {
319 fprintf(stderr, "%s line %d: missing inet addr.\n",
320 filename, linenum);
321 exit(1);
322 }
323 options->listen_addr.s_addr = inet_addr(cp);
324 break;
325
326 case sHostKeyFile:
327 charptr = &options->host_key_file;
328 cp = strtok(NULL, WHITESPACE);
329 if (!cp)
330 {
331 fprintf(stderr, "%s line %d: missing file name.\n",
332 filename, linenum);
333 exit(1);
334 }
335 if (*charptr == NULL)
336 *charptr = tilde_expand_filename(cp, getuid());
337 break;
338
339 case sRandomSeedFile:
340 fprintf(stderr, "%s line %d: \"randomseed\" option is obsolete.\n",
341 filename, linenum);
342 cp = strtok(NULL, WHITESPACE);
343 break;
344
345 case sPermitRootLogin:
346 intptr = &options->permit_root_login;
347 cp = strtok(NULL, WHITESPACE);
348 if (!cp)
349 {
350 fprintf(stderr, "%s line %d: missing yes/without-password/no argument.\n",
351 filename, linenum);
352 exit(1);
353 }
354 if (strcmp(cp, "without-password") == 0)
355 value = 2;
356 else if (strcmp(cp, "yes") == 0)
357 value = 1;
358 else if (strcmp(cp, "no") == 0)
359 value = 0;
360 else
361 {
362 fprintf(stderr, "%s line %d: Bad yes/without-password/no argument: %s\n",
363 filename, linenum, cp);
364 exit(1);
365 }
366 if (*intptr == -1)
367 *intptr = value;
368 break;
369
370 case sIgnoreRhosts:
371 intptr = &options->ignore_rhosts;
372 parse_flag:
373 cp = strtok(NULL, WHITESPACE);
374 if (!cp)
375 {
376 fprintf(stderr, "%s line %d: missing yes/no argument.\n",
377 filename, linenum);
378 exit(1);
379 }
380 if (strcmp(cp, "yes") == 0)
381 value = 1;
382 else
383 if (strcmp(cp, "no") == 0)
384 value = 0;
385 else
386 {
387 fprintf(stderr, "%s line %d: Bad yes/no argument: %s\n",
388 filename, linenum, cp);
389 exit(1);
390 }
391 if (*intptr == -1)
392 *intptr = value;
393 break;
394
395 case sQuietMode:
396 intptr = &options->quiet_mode;
397 goto parse_flag;
398
399 case sFascistLogging:
400 intptr = &options->fascist_logging;
401 goto parse_flag;
402
403 case sRhostsAuthentication:
404 intptr = &options->rhosts_authentication;
405 goto parse_flag;
406
407 case sRhostsRSAAuthentication:
408 intptr = &options->rhosts_rsa_authentication;
409 goto parse_flag;
410
411 case sRSAAuthentication:
412 intptr = &options->rsa_authentication;
413 goto parse_flag;
414
415#ifdef KRB4
416 case sKerberosAuthentication:
417 intptr = &options->kerberos_authentication;
418 goto parse_flag;
419
420 case sKerberosOrLocalPasswd:
421 intptr = &options->kerberos_or_local_passwd;
422 goto parse_flag;
423
424 case sKerberosTicketCleanup:
425 intptr = &options->kerberos_ticket_cleanup;
426 goto parse_flag;
427#endif
428
429#ifdef AFS
430 case sKerberosTgtPassing:
431 intptr = &options->kerberos_tgt_passing;
432 goto parse_flag;
433
434 case sAFSTokenPassing:
435 intptr = &options->afs_token_passing;
436 goto parse_flag;
437#endif
438
439 case sPasswordAuthentication:
440 intptr = &options->password_authentication;
441 goto parse_flag;
442
443 case sCheckMail:
444 intptr = &options->check_mail;
445 goto parse_flag;
446
447#ifdef SKEY
448 case sSkeyAuthentication:
449 intptr = &options->skey_authentication;
450 goto parse_flag;
451#endif
452
453 case sPrintMotd:
454 intptr = &options->print_motd;
455 goto parse_flag;
456
457 case sX11Forwarding:
458 intptr = &options->x11_forwarding;
459 goto parse_flag;
460
461 case sX11DisplayOffset:
462 intptr = &options->x11_display_offset;
463 goto parse_int;
464
465 case sStrictModes:
466 intptr = &options->strict_modes;
467 goto parse_flag;
468
469 case sKeepAlives:
470 intptr = &options->keepalives;
471 goto parse_flag;
472
473 case sEmptyPasswd:
474 intptr = &options->permit_empty_passwd;
475 goto parse_flag;
476
477 case sUseLogin:
478 intptr = &options->use_login;
479 goto parse_flag;
480
481 case sLogFacility:
482 cp = strtok(NULL, WHITESPACE);
483 if (!cp)
484 {
485 fprintf(stderr, "%s line %d: missing facility name.\n",
486 filename, linenum);
487 exit(1);
488 }
489 for (i = 0; log_facilities[i].name; i++)
490 if (strcmp(log_facilities[i].name, cp) == 0)
491 break;
492 if (!log_facilities[i].name)
493 {
494 fprintf(stderr, "%s line %d: unsupported log facility %s\n",
495 filename, linenum, cp);
496 exit(1);
497 }
498 if (options->log_facility == (SyslogFacility)(-1))
499 options->log_facility = log_facilities[i].facility;
500 break;
501
502 case sAllowUsers:
503 while ((cp = strtok(NULL, WHITESPACE)))
504 {
505 if (options->num_allow_users >= MAX_ALLOW_USERS)
506 {
507 fprintf(stderr, "%s line %d: too many allow users.\n",
508 filename, linenum);
509 exit(1);
510 }
511 options->allow_users[options->num_allow_users++] = xstrdup(cp);
512 }
513 break;
514
515 case sDenyUsers:
516 while ((cp = strtok(NULL, WHITESPACE)))
517 {
518 if (options->num_deny_users >= MAX_DENY_USERS)
519 {
520 fprintf(stderr, "%s line %d: too many deny users.\n",
521 filename, linenum);
522 exit(1);
523 }
524 options->deny_users[options->num_deny_users++] = xstrdup(cp);
525 }
526 break;
527
528 case sAllowGroups:
529 while ((cp = strtok(NULL, WHITESPACE)))
530 {
531 if (options->num_allow_groups >= MAX_ALLOW_GROUPS)
532 {
533 fprintf(stderr, "%s line %d: too many allow groups.\n",
534 filename, linenum);
535 exit(1);
536 }
537 options->allow_groups[options->num_allow_groups++] = xstrdup(cp);
538 }
539 break;
540
541 case sDenyGroups:
542 while ((cp = strtok(NULL, WHITESPACE)))
543 {
544 if (options->num_deny_groups >= MAX_DENY_GROUPS)
545 {
546 fprintf(stderr, "%s line %d: too many deny groups.\n",
547 filename, linenum);
548 exit(1);
549 }
550 options->deny_groups[options->num_deny_groups++] = xstrdup(cp);
551 }
552 break;
553
554 default:
555 fprintf(stderr, "%s line %d: Missing handler for opcode %s (%d)\n",
556 filename, linenum, cp, opcode);
557 exit(1);
558 }
559 if (strtok(NULL, WHITESPACE) != NULL)
560 {
561 fprintf(stderr, "%s line %d: garbage at end of line.\n",
562 filename, linenum);
563 exit(1);
564 }
565 }
566 fclose(f);
567}
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