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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;
8efc0c15 34 options->print_motd = -1;
35 options->check_mail = -1;
36 options->x11_forwarding = -1;
37 options->x11_display_offset = -1;
38 options->strict_modes = -1;
39 options->keepalives = -1;
40 options->log_facility = (SyslogFacility)-1;
6a17f9c2 41 options->log_level = (LogLevel)-1;
8efc0c15 42 options->rhosts_authentication = -1;
43 options->rhosts_rsa_authentication = -1;
44 options->rsa_authentication = -1;
45#ifdef KRB4
46 options->kerberos_authentication = -1;
47 options->kerberos_or_local_passwd = -1;
48 options->kerberos_ticket_cleanup = -1;
49#endif
50#ifdef AFS
51 options->kerberos_tgt_passing = -1;
52 options->afs_token_passing = -1;
53#endif
54 options->password_authentication = -1;
55#ifdef SKEY
56 options->skey_authentication = -1;
57#endif
58 options->permit_empty_passwd = -1;
59 options->use_login = -1;
60 options->num_allow_users = 0;
61 options->num_deny_users = 0;
62 options->num_allow_groups = 0;
63 options->num_deny_groups = 0;
64}
65
66void fill_default_server_options(ServerOptions *options)
67{
68 if (options->port == -1)
69 {
70 struct servent *sp;
71
72 sp = getservbyname(SSH_SERVICE_NAME, "tcp");
73 if (sp)
74 options->port = ntohs(sp->s_port);
75 else
76 options->port = SSH_DEFAULT_PORT;
77 endservent();
78 }
79 if (options->host_key_file == NULL)
80 options->host_key_file = HOST_KEY_FILE;
81 if (options->server_key_bits == -1)
82 options->server_key_bits = 768;
83 if (options->login_grace_time == -1)
84 options->login_grace_time = 600;
85 if (options->key_regeneration_time == -1)
86 options->key_regeneration_time = 3600;
87 if (options->permit_root_login == -1)
88 options->permit_root_login = 1; /* yes */
89 if (options->ignore_rhosts == -1)
90 options->ignore_rhosts = 0;
8efc0c15 91 if (options->check_mail == -1)
92 options->check_mail = 0;
8efc0c15 93 if (options->print_motd == -1)
94 options->print_motd = 1;
95 if (options->x11_forwarding == -1)
96 options->x11_forwarding = 1;
97 if (options->x11_display_offset == -1)
98 options->x11_display_offset = 1;
99 if (options->strict_modes == -1)
100 options->strict_modes = 1;
101 if (options->keepalives == -1)
102 options->keepalives = 1;
103 if (options->log_facility == (SyslogFacility)(-1))
104 options->log_facility = SYSLOG_FACILITY_AUTH;
6a17f9c2 105 if (options->log_level == (LogLevel)(-1))
106 options->log_level = SYSLOG_LEVEL_INFO;
8efc0c15 107 if (options->rhosts_authentication == -1)
108 options->rhosts_authentication = 0;
109 if (options->rhosts_rsa_authentication == -1)
110 options->rhosts_rsa_authentication = 1;
111 if (options->rsa_authentication == -1)
112 options->rsa_authentication = 1;
113#ifdef KRB4
114 if (options->kerberos_authentication == -1)
115 options->kerberos_authentication = (access(KEYFILE, R_OK) == 0);
116 if (options->kerberos_or_local_passwd == -1)
117 options->kerberos_or_local_passwd = 1;
118 if (options->kerberos_ticket_cleanup == -1)
119 options->kerberos_ticket_cleanup = 1;
120#endif /* KRB4 */
121#ifdef AFS
122 if (options->kerberos_tgt_passing == -1)
123 options->kerberos_tgt_passing = 0;
124 if (options->afs_token_passing == -1)
125 options->afs_token_passing = k_hasafs();
126#endif /* AFS */
127 if (options->password_authentication == -1)
128 options->password_authentication = 1;
129#ifdef SKEY
130 if (options->skey_authentication == -1)
131 options->skey_authentication = 1;
132#endif
133 if (options->permit_empty_passwd == -1)
134 options->permit_empty_passwd = 1;
135 if (options->use_login == -1)
136 options->use_login = 0;
137}
138
139#define WHITESPACE " \t\r\n"
140
141/* Keyword tokens. */
142typedef enum
143{
144 sPort, sHostKeyFile, sServerKeyBits, sLoginGraceTime, sKeyRegenerationTime,
6a17f9c2 145 sPermitRootLogin, sLogFacility, sLogLevel,
8efc0c15 146 sRhostsAuthentication, sRhostsRSAAuthentication, sRSAAuthentication,
147#ifdef KRB4
148 sKerberosAuthentication, sKerberosOrLocalPasswd, sKerberosTicketCleanup,
149#endif
150#ifdef AFS
151 sKerberosTgtPassing, sAFSTokenPassing,
152#endif
153#ifdef SKEY
154 sSkeyAuthentication,
155#endif
156 sPasswordAuthentication, sListenAddress,
157 sPrintMotd, sIgnoreRhosts, sX11Forwarding, sX11DisplayOffset,
158 sStrictModes, sEmptyPasswd, sRandomSeedFile, sKeepAlives, sCheckMail,
159 sUseLogin, sAllowUsers, sDenyUsers, sAllowGroups, sDenyGroups
160
161} ServerOpCodes;
162
163/* Textual representation of the tokens. */
164static struct
165{
166 const char *name;
167 ServerOpCodes opcode;
168} keywords[] =
169{
170 { "port", sPort },
171 { "hostkey", sHostKeyFile },
172 { "serverkeybits", sServerKeyBits },
173 { "logingracetime", sLoginGraceTime },
174 { "keyregenerationinterval", sKeyRegenerationTime },
175 { "permitrootlogin", sPermitRootLogin },
8efc0c15 176 { "syslogfacility", sLogFacility },
6a17f9c2 177 { "loglevel", sLogLevel },
8efc0c15 178 { "rhostsauthentication", sRhostsAuthentication },
179 { "rhostsrsaauthentication", sRhostsRSAAuthentication },
180 { "rsaauthentication", sRSAAuthentication },
181#ifdef KRB4
182 { "kerberosauthentication", sKerberosAuthentication },
183 { "kerberosorlocalpasswd", sKerberosOrLocalPasswd },
184 { "kerberosticketcleanup", sKerberosTicketCleanup },
185#endif
186#ifdef AFS
187 { "kerberostgtpassing", sKerberosTgtPassing },
188 { "afstokenpassing", sAFSTokenPassing },
189#endif
190 { "passwordauthentication", sPasswordAuthentication },
191#ifdef SKEY
192 { "skeyauthentication", sSkeyAuthentication },
193#endif
194 { "checkmail", sCheckMail },
195 { "listenaddress", sListenAddress },
196 { "printmotd", sPrintMotd },
197 { "ignorerhosts", sIgnoreRhosts },
198 { "x11forwarding", sX11Forwarding },
199 { "x11displayoffset", sX11DisplayOffset },
200 { "strictmodes", sStrictModes },
201 { "permitemptypasswords", sEmptyPasswd },
202 { "uselogin", sUseLogin },
203 { "randomseed", sRandomSeedFile },
204 { "keepalive", sKeepAlives },
205 { "allowusers", sAllowUsers },
206 { "denyusers", sDenyUsers },
207 { "allowgroups", sAllowGroups },
208 { "denygroups", sDenyGroups },
209 { NULL, 0 }
210};
211
212static struct
213{
214 const char *name;
215 SyslogFacility facility;
216} log_facilities[] =
217{
218 { "DAEMON", SYSLOG_FACILITY_DAEMON },
219 { "USER", SYSLOG_FACILITY_USER },
220 { "AUTH", SYSLOG_FACILITY_AUTH },
221 { "LOCAL0", SYSLOG_FACILITY_LOCAL0 },
222 { "LOCAL1", SYSLOG_FACILITY_LOCAL1 },
223 { "LOCAL2", SYSLOG_FACILITY_LOCAL2 },
224 { "LOCAL3", SYSLOG_FACILITY_LOCAL3 },
225 { "LOCAL4", SYSLOG_FACILITY_LOCAL4 },
226 { "LOCAL5", SYSLOG_FACILITY_LOCAL5 },
227 { "LOCAL6", SYSLOG_FACILITY_LOCAL6 },
228 { "LOCAL7", SYSLOG_FACILITY_LOCAL7 },
229 { NULL, 0 }
230};
231
6a17f9c2 232static struct
233{
234 const char *name;
235 LogLevel level;
236} log_levels[] =
237{
238 { "QUIET", SYSLOG_LEVEL_QUIET },
239 { "FATAL", SYSLOG_LEVEL_FATAL },
240 { "ERROR", SYSLOG_LEVEL_ERROR },
241 { "INFO", SYSLOG_LEVEL_INFO },
242 { "CHAT", SYSLOG_LEVEL_CHAT },
243 { "DEBUG", SYSLOG_LEVEL_DEBUG },
244 { NULL, 0 }
245};
246
8efc0c15 247/* Returns the number of the token pointed to by cp of length len.
248 Never returns if the token is not known. */
249
250static ServerOpCodes parse_token(const char *cp, const char *filename,
251 int linenum)
252{
253 unsigned int i;
254
255 for (i = 0; keywords[i].name; i++)
256 if (strcmp(cp, keywords[i].name) == 0)
257 return keywords[i].opcode;
258
259 fprintf(stderr, "%s line %d: Bad configuration option: %s\n",
260 filename, linenum, cp);
261 exit(1);
262}
263
264/* Reads the server configuration file. */
265
266void read_server_config(ServerOptions *options, const char *filename)
267{
268 FILE *f;
269 char line[1024];
270 char *cp, **charptr;
271 int linenum, *intptr, i, value;
272 ServerOpCodes opcode;
273
274 f = fopen(filename, "r");
275 if (!f)
276 {
277 perror(filename);
278 exit(1);
279 }
280
281 linenum = 0;
282 while (fgets(line, sizeof(line), f))
283 {
284 linenum++;
285 cp = line + strspn(line, WHITESPACE);
286 if (!*cp || *cp == '#')
287 continue;
288 cp = strtok(cp, WHITESPACE);
289 {
290 char *t = cp;
291 for (; *t != 0; t++)
292 if ('A' <= *t && *t <= 'Z')
293 *t = *t - 'A' + 'a'; /* tolower */
294
295 }
296 opcode = parse_token(cp, filename, linenum);
297 switch (opcode)
298 {
299 case sPort:
300 intptr = &options->port;
301 parse_int:
302 cp = strtok(NULL, WHITESPACE);
303 if (!cp)
304 {
305 fprintf(stderr, "%s line %d: missing integer value.\n",
306 filename, linenum);
307 exit(1);
308 }
309 value = atoi(cp);
310 if (*intptr == -1)
311 *intptr = value;
312 break;
313
314 case sServerKeyBits:
315 intptr = &options->server_key_bits;
316 goto parse_int;
317
318 case sLoginGraceTime:
319 intptr = &options->login_grace_time;
320 goto parse_int;
321
322 case sKeyRegenerationTime:
323 intptr = &options->key_regeneration_time;
324 goto parse_int;
325
326 case sListenAddress:
327 cp = strtok(NULL, WHITESPACE);
328 if (!cp)
329 {
330 fprintf(stderr, "%s line %d: missing inet addr.\n",
331 filename, linenum);
332 exit(1);
333 }
334 options->listen_addr.s_addr = inet_addr(cp);
335 break;
336
337 case sHostKeyFile:
338 charptr = &options->host_key_file;
339 cp = strtok(NULL, WHITESPACE);
340 if (!cp)
341 {
342 fprintf(stderr, "%s line %d: missing file name.\n",
343 filename, linenum);
344 exit(1);
345 }
346 if (*charptr == NULL)
347 *charptr = tilde_expand_filename(cp, getuid());
348 break;
349
350 case sRandomSeedFile:
351 fprintf(stderr, "%s line %d: \"randomseed\" option is obsolete.\n",
352 filename, linenum);
353 cp = strtok(NULL, WHITESPACE);
354 break;
355
356 case sPermitRootLogin:
357 intptr = &options->permit_root_login;
358 cp = strtok(NULL, WHITESPACE);
359 if (!cp)
360 {
361 fprintf(stderr, "%s line %d: missing yes/without-password/no argument.\n",
362 filename, linenum);
363 exit(1);
364 }
365 if (strcmp(cp, "without-password") == 0)
366 value = 2;
367 else if (strcmp(cp, "yes") == 0)
368 value = 1;
369 else if (strcmp(cp, "no") == 0)
370 value = 0;
371 else
372 {
373 fprintf(stderr, "%s line %d: Bad yes/without-password/no argument: %s\n",
374 filename, linenum, cp);
375 exit(1);
376 }
377 if (*intptr == -1)
378 *intptr = value;
379 break;
380
381 case sIgnoreRhosts:
382 intptr = &options->ignore_rhosts;
383 parse_flag:
384 cp = strtok(NULL, WHITESPACE);
385 if (!cp)
386 {
387 fprintf(stderr, "%s line %d: missing yes/no argument.\n",
388 filename, linenum);
389 exit(1);
390 }
391 if (strcmp(cp, "yes") == 0)
392 value = 1;
393 else
394 if (strcmp(cp, "no") == 0)
395 value = 0;
396 else
397 {
398 fprintf(stderr, "%s line %d: Bad yes/no argument: %s\n",
399 filename, linenum, cp);
400 exit(1);
401 }
402 if (*intptr == -1)
403 *intptr = value;
404 break;
405
8efc0c15 406 case sRhostsAuthentication:
407 intptr = &options->rhosts_authentication;
408 goto parse_flag;
409
410 case sRhostsRSAAuthentication:
411 intptr = &options->rhosts_rsa_authentication;
412 goto parse_flag;
413
414 case sRSAAuthentication:
415 intptr = &options->rsa_authentication;
416 goto parse_flag;
417
418#ifdef KRB4
419 case sKerberosAuthentication:
420 intptr = &options->kerberos_authentication;
421 goto parse_flag;
422
423 case sKerberosOrLocalPasswd:
424 intptr = &options->kerberos_or_local_passwd;
425 goto parse_flag;
426
427 case sKerberosTicketCleanup:
428 intptr = &options->kerberos_ticket_cleanup;
429 goto parse_flag;
430#endif
431
432#ifdef AFS
433 case sKerberosTgtPassing:
434 intptr = &options->kerberos_tgt_passing;
435 goto parse_flag;
436
437 case sAFSTokenPassing:
438 intptr = &options->afs_token_passing;
439 goto parse_flag;
440#endif
441
442 case sPasswordAuthentication:
443 intptr = &options->password_authentication;
444 goto parse_flag;
445
446 case sCheckMail:
447 intptr = &options->check_mail;
448 goto parse_flag;
449
450#ifdef SKEY
451 case sSkeyAuthentication:
452 intptr = &options->skey_authentication;
453 goto parse_flag;
454#endif
455
456 case sPrintMotd:
457 intptr = &options->print_motd;
458 goto parse_flag;
459
460 case sX11Forwarding:
461 intptr = &options->x11_forwarding;
462 goto parse_flag;
463
464 case sX11DisplayOffset:
465 intptr = &options->x11_display_offset;
466 goto parse_int;
467
468 case sStrictModes:
469 intptr = &options->strict_modes;
470 goto parse_flag;
471
472 case sKeepAlives:
473 intptr = &options->keepalives;
474 goto parse_flag;
475
476 case sEmptyPasswd:
477 intptr = &options->permit_empty_passwd;
478 goto parse_flag;
479
480 case sUseLogin:
481 intptr = &options->use_login;
482 goto parse_flag;
483
484 case sLogFacility:
485 cp = strtok(NULL, WHITESPACE);
486 if (!cp)
487 {
488 fprintf(stderr, "%s line %d: missing facility name.\n",
489 filename, linenum);
490 exit(1);
491 }
492 for (i = 0; log_facilities[i].name; i++)
6a17f9c2 493 if (strcasecmp(log_facilities[i].name, cp) == 0)
8efc0c15 494 break;
495 if (!log_facilities[i].name)
496 {
497 fprintf(stderr, "%s line %d: unsupported log facility %s\n",
498 filename, linenum, cp);
499 exit(1);
500 }
501 if (options->log_facility == (SyslogFacility)(-1))
502 options->log_facility = log_facilities[i].facility;
503 break;
6a17f9c2 504
505 case sLogLevel:
506 cp = strtok(NULL, WHITESPACE);
507 if (!cp)
508 {
509 fprintf(stderr, "%s line %d: missing level name.\n",
510 filename, linenum);
511 exit(1);
512 }
513 for (i = 0; log_levels[i].name; i++)
514 if (strcasecmp(log_levels[i].name, cp) == 0)
515 break;
516 if (!log_levels[i].name)
517 {
518 fprintf(stderr, "%s line %d: unsupported log level %s\n",
519 filename, linenum, cp);
520 exit(1);
521 }
522 if (options->log_level == (LogLevel)(-1))
523 options->log_level = log_levels[i].level;
524 break;
8efc0c15 525
526 case sAllowUsers:
527 while ((cp = strtok(NULL, WHITESPACE)))
528 {
529 if (options->num_allow_users >= MAX_ALLOW_USERS)
530 {
531 fprintf(stderr, "%s line %d: too many allow users.\n",
532 filename, linenum);
533 exit(1);
534 }
535 options->allow_users[options->num_allow_users++] = xstrdup(cp);
536 }
537 break;
538
539 case sDenyUsers:
540 while ((cp = strtok(NULL, WHITESPACE)))
541 {
542 if (options->num_deny_users >= MAX_DENY_USERS)
543 {
544 fprintf(stderr, "%s line %d: too many deny users.\n",
545 filename, linenum);
546 exit(1);
547 }
548 options->deny_users[options->num_deny_users++] = xstrdup(cp);
549 }
550 break;
551
552 case sAllowGroups:
553 while ((cp = strtok(NULL, WHITESPACE)))
554 {
555 if (options->num_allow_groups >= MAX_ALLOW_GROUPS)
556 {
557 fprintf(stderr, "%s line %d: too many allow groups.\n",
558 filename, linenum);
559 exit(1);
560 }
561 options->allow_groups[options->num_allow_groups++] = xstrdup(cp);
562 }
563 break;
564
565 case sDenyGroups:
566 while ((cp = strtok(NULL, WHITESPACE)))
567 {
568 if (options->num_deny_groups >= MAX_DENY_GROUPS)
569 {
570 fprintf(stderr, "%s line %d: too many deny groups.\n",
571 filename, linenum);
572 exit(1);
573 }
574 options->deny_groups[options->num_deny_groups++] = xstrdup(cp);
575 }
576 break;
577
578 default:
579 fprintf(stderr, "%s line %d: Missing handler for opcode %s (%d)\n",
580 filename, linenum, cp, opcode);
581 exit(1);
582 }
583 if (strtok(NULL, WHITESPACE) != NULL)
584 {
585 fprintf(stderr, "%s line %d: garbage at end of line.\n",
586 filename, linenum);
587 exit(1);
588 }
589 }
590 fclose(f);
591}
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