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1.1 deraadt 1: /*
1.26 ! deraadt 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: */
1.1 deraadt 13:
14: #include "includes.h"
1.26 ! deraadt 15: RCSID("$Id: servconf.c,v 1.25 1999/11/23 22:25:54 markus Exp $");
1.1 deraadt 16:
17: #include "ssh.h"
18: #include "servconf.h"
19: #include "xmalloc.h"
20:
21: /* Initializes the server options to their default values. */
22:
1.25 markus 23: void
24: initialize_server_options(ServerOptions *options)
1.1 deraadt 25: {
1.25 markus 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;
1.1 deraadt 47: #ifdef KRB4
1.25 markus 48: options->kerberos_authentication = -1;
49: options->kerberos_or_local_passwd = -1;
50: options->kerberos_ticket_cleanup = -1;
1.1 deraadt 51: #endif
1.4 dugsong 52: #ifdef AFS
1.25 markus 53: options->kerberos_tgt_passing = -1;
54: options->afs_token_passing = -1;
1.1 deraadt 55: #endif
1.25 markus 56: options->password_authentication = -1;
1.10 markus 57: #ifdef SKEY
1.25 markus 58: options->skey_authentication = -1;
1.10 markus 59: #endif
1.25 markus 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;
1.1 deraadt 66: }
67:
1.25 markus 68: void
69: fill_default_server_options(ServerOptions *options)
1.1 deraadt 70: {
1.25 markus 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;
1.1 deraadt 117: #ifdef KRB4
1.25 markus 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;
1.4 dugsong 124: #endif /* KRB4 */
125: #ifdef AFS
1.25 markus 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();
1.4 dugsong 130: #endif /* AFS */
1.25 markus 131: if (options->password_authentication == -1)
132: options->password_authentication = 1;
1.10 markus 133: #ifdef SKEY
1.25 markus 134: if (options->skey_authentication == -1)
135: options->skey_authentication = 1;
1.10 markus 136: #endif
1.25 markus 137: if (options->permit_empty_passwd == -1)
138: options->permit_empty_passwd = 1;
139: if (options->use_login == -1)
140: options->use_login = 0;
1.1 deraadt 141: }
142:
143: #define WHITESPACE " \t\r\n"
144:
145: /* Keyword tokens. */
1.25 markus 146: typedef enum {
147: sBadOption, /* == unknown option */
148: sPort, sHostKeyFile, sServerKeyBits, sLoginGraceTime, sKeyRegenerationTime,
149: sPermitRootLogin, sLogFacility, sLogLevel,
150: sRhostsAuthentication, sRhostsRSAAuthentication, sRSAAuthentication,
1.1 deraadt 151: #ifdef KRB4
1.25 markus 152: sKerberosAuthentication, sKerberosOrLocalPasswd, sKerberosTicketCleanup,
1.1 deraadt 153: #endif
154: #ifdef AFS
1.25 markus 155: sKerberosTgtPassing, sAFSTokenPassing,
1.1 deraadt 156: #endif
1.10 markus 157: #ifdef SKEY
1.25 markus 158: sSkeyAuthentication,
1.10 markus 159: #endif
1.25 markus 160: sPasswordAuthentication, sListenAddress,
161: sPrintMotd, sIgnoreRhosts, sX11Forwarding, sX11DisplayOffset,
162: sStrictModes, sEmptyPasswd, sRandomSeedFile, sKeepAlives, sCheckMail,
163: sUseLogin, sAllowUsers, sDenyUsers, sAllowGroups, sDenyGroups,
164: sIgnoreUserKnownHosts
1.1 deraadt 165: } ServerOpCodes;
166:
167: /* Textual representation of the tokens. */
1.25 markus 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 },
1.1 deraadt 183: #ifdef KRB4
1.25 markus 184: { "kerberosauthentication", sKerberosAuthentication },
185: { "kerberosorlocalpasswd", sKerberosOrLocalPasswd },
186: { "kerberosticketcleanup", sKerberosTicketCleanup },
1.1 deraadt 187: #endif
1.4 dugsong 188: #ifdef AFS
1.25 markus 189: { "kerberostgtpassing", sKerberosTgtPassing },
190: { "afstokenpassing", sAFSTokenPassing },
1.1 deraadt 191: #endif
1.25 markus 192: { "passwordauthentication", sPasswordAuthentication },
1.10 markus 193: #ifdef SKEY
1.25 markus 194: { "skeyauthentication", sSkeyAuthentication },
1.10 markus 195: #endif
1.25 markus 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 }
1.1 deraadt 213: };
214:
215: /* Returns the number of the token pointed to by cp of length len.
216: Never returns if the token is not known. */
217:
1.25 markus 218: static ServerOpCodes
219: parse_token(const char *cp, const char *filename,
220: int linenum)
1.1 deraadt 221: {
1.25 markus 222: unsigned int i;
1.1 deraadt 223:
1.25 markus 224: for (i = 0; keywords[i].name; i++)
225: if (strcmp(cp, keywords[i].name) == 0)
226: return keywords[i].opcode;
227:
228: fprintf(stderr, "%s: line %d: Bad configuration option: %s\n",
229: filename, linenum, cp);
230: return sBadOption;
1.1 deraadt 231: }
232:
233: /* Reads the server configuration file. */
234:
1.25 markus 235: void
236: read_server_config(ServerOptions *options, const char *filename)
1.1 deraadt 237: {
1.25 markus 238: FILE *f;
239: char line[1024];
240: char *cp, **charptr;
241: int linenum, *intptr, value;
242: int bad_options = 0;
243: ServerOpCodes opcode;
244:
245: f = fopen(filename, "r");
246: if (!f) {
247: perror(filename);
1.1 deraadt 248: exit(1);
1.25 markus 249: }
250: linenum = 0;
251: while (fgets(line, sizeof(line), f)) {
252: linenum++;
253: cp = line + strspn(line, WHITESPACE);
254: if (!*cp || *cp == '#')
255: continue;
256: cp = strtok(cp, WHITESPACE);
257: {
258: char *t = cp;
259: for (; *t != 0; t++)
260: if ('A' <= *t && *t <= 'Z')
261: *t = *t - 'A' + 'a'; /* tolower */
262:
263: }
264: opcode = parse_token(cp, filename, linenum);
265: switch (opcode) {
266: case sBadOption:
267: bad_options++;
268: continue;
269: case sPort:
270: intptr = &options->port;
271: parse_int:
272: cp = strtok(NULL, WHITESPACE);
273: if (!cp) {
274: fprintf(stderr, "%s line %d: missing integer value.\n",
275: filename, linenum);
276: exit(1);
277: }
278: value = atoi(cp);
279: if (*intptr == -1)
280: *intptr = value;
281: break;
282:
283: case sServerKeyBits:
284: intptr = &options->server_key_bits;
285: goto parse_int;
286:
287: case sLoginGraceTime:
288: intptr = &options->login_grace_time;
289: goto parse_int;
290:
291: case sKeyRegenerationTime:
292: intptr = &options->key_regeneration_time;
293: goto parse_int;
294:
295: case sListenAddress:
296: cp = strtok(NULL, WHITESPACE);
297: if (!cp) {
298: fprintf(stderr, "%s line %d: missing inet addr.\n",
299: filename, linenum);
300: exit(1);
301: }
302: options->listen_addr.s_addr = inet_addr(cp);
303: break;
304:
305: case sHostKeyFile:
306: charptr = &options->host_key_file;
307: cp = strtok(NULL, WHITESPACE);
308: if (!cp) {
309: fprintf(stderr, "%s line %d: missing file name.\n",
310: filename, linenum);
311: exit(1);
312: }
313: if (*charptr == NULL)
314: *charptr = tilde_expand_filename(cp, getuid());
315: break;
316:
317: case sRandomSeedFile:
318: fprintf(stderr, "%s line %d: \"randomseed\" option is obsolete.\n",
319: filename, linenum);
320: cp = strtok(NULL, WHITESPACE);
321: break;
322:
323: case sPermitRootLogin:
324: intptr = &options->permit_root_login;
325: cp = strtok(NULL, WHITESPACE);
326: if (!cp) {
327: fprintf(stderr, "%s line %d: missing yes/without-password/no argument.\n",
328: filename, linenum);
329: exit(1);
330: }
331: if (strcmp(cp, "without-password") == 0)
332: value = 2;
333: else if (strcmp(cp, "yes") == 0)
334: value = 1;
335: else if (strcmp(cp, "no") == 0)
336: value = 0;
337: else {
338: fprintf(stderr, "%s line %d: Bad yes/without-password/no argument: %s\n",
339: filename, linenum, cp);
340: exit(1);
341: }
342: if (*intptr == -1)
343: *intptr = value;
344: break;
345:
346: case sIgnoreRhosts:
347: intptr = &options->ignore_rhosts;
348: parse_flag:
349: cp = strtok(NULL, WHITESPACE);
350: if (!cp) {
351: fprintf(stderr, "%s line %d: missing yes/no argument.\n",
352: filename, linenum);
353: exit(1);
354: }
355: if (strcmp(cp, "yes") == 0)
356: value = 1;
357: else if (strcmp(cp, "no") == 0)
358: value = 0;
359: else {
360: fprintf(stderr, "%s line %d: Bad yes/no argument: %s\n",
361: filename, linenum, cp);
362: exit(1);
363: }
364: if (*intptr == -1)
365: *intptr = value;
366: break;
367:
368: case sIgnoreUserKnownHosts:
369: intptr = &options->ignore_user_known_hosts;
370: goto parse_int;
371:
372: case sRhostsAuthentication:
373: intptr = &options->rhosts_authentication;
374: goto parse_flag;
375:
376: case sRhostsRSAAuthentication:
377: intptr = &options->rhosts_rsa_authentication;
378: goto parse_flag;
379:
380: case sRSAAuthentication:
381: intptr = &options->rsa_authentication;
382: goto parse_flag;
383:
1.1 deraadt 384: #ifdef KRB4
1.25 markus 385: case sKerberosAuthentication:
386: intptr = &options->kerberos_authentication;
387: goto parse_flag;
388:
389: case sKerberosOrLocalPasswd:
390: intptr = &options->kerberos_or_local_passwd;
391: goto parse_flag;
392:
393: case sKerberosTicketCleanup:
394: intptr = &options->kerberos_ticket_cleanup;
395: goto parse_flag;
1.1 deraadt 396: #endif
1.25 markus 397:
1.4 dugsong 398: #ifdef AFS
1.25 markus 399: case sKerberosTgtPassing:
400: intptr = &options->kerberos_tgt_passing;
401: goto parse_flag;
402:
403: case sAFSTokenPassing:
404: intptr = &options->afs_token_passing;
405: goto parse_flag;
406: #endif
407:
408: case sPasswordAuthentication:
409: intptr = &options->password_authentication;
410: goto parse_flag;
411:
412: case sCheckMail:
413: intptr = &options->check_mail;
414: goto parse_flag;
1.10 markus 415:
416: #ifdef SKEY
1.25 markus 417: case sSkeyAuthentication:
418: intptr = &options->skey_authentication;
419: goto parse_flag;
420: #endif
421:
422: case sPrintMotd:
423: intptr = &options->print_motd;
424: goto parse_flag;
425:
426: case sX11Forwarding:
427: intptr = &options->x11_forwarding;
428: goto parse_flag;
429:
430: case sX11DisplayOffset:
431: intptr = &options->x11_display_offset;
432: goto parse_int;
433:
434: case sStrictModes:
435: intptr = &options->strict_modes;
436: goto parse_flag;
437:
438: case sKeepAlives:
439: intptr = &options->keepalives;
440: goto parse_flag;
441:
442: case sEmptyPasswd:
443: intptr = &options->permit_empty_passwd;
444: goto parse_flag;
445:
446: case sUseLogin:
447: intptr = &options->use_login;
448: goto parse_flag;
449:
450: case sLogFacility:
451: intptr = (int *) &options->log_facility;
452: cp = strtok(NULL, WHITESPACE);
453: value = log_facility_number(cp);
454: if (value == (SyslogFacility) - 1)
455: fatal("%.200s line %d: unsupported log facility '%s'\n",
456: filename, linenum, cp ? cp : "<NONE>");
457: if (*intptr == -1)
458: *intptr = (SyslogFacility) value;
459: break;
460:
461: case sLogLevel:
462: intptr = (int *) &options->log_level;
463: cp = strtok(NULL, WHITESPACE);
464: value = log_level_number(cp);
465: if (value == (LogLevel) - 1)
466: fatal("%.200s line %d: unsupported log level '%s'\n",
467: filename, linenum, cp ? cp : "<NONE>");
468: if (*intptr == -1)
469: *intptr = (LogLevel) value;
470: break;
471:
472: case sAllowUsers:
473: while ((cp = strtok(NULL, WHITESPACE))) {
474: if (options->num_allow_users >= MAX_ALLOW_USERS) {
475: fprintf(stderr, "%s line %d: too many allow users.\n",
476: filename, linenum);
477: exit(1);
478: }
479: options->allow_users[options->num_allow_users++] = xstrdup(cp);
480: }
481: break;
482:
483: case sDenyUsers:
484: while ((cp = strtok(NULL, WHITESPACE))) {
485: if (options->num_deny_users >= MAX_DENY_USERS) {
486: fprintf(stderr, "%s line %d: too many deny users.\n",
487: filename, linenum);
488: exit(1);
489: }
490: options->deny_users[options->num_deny_users++] = xstrdup(cp);
491: }
492: break;
493:
494: case sAllowGroups:
495: while ((cp = strtok(NULL, WHITESPACE))) {
496: if (options->num_allow_groups >= MAX_ALLOW_GROUPS) {
497: fprintf(stderr, "%s line %d: too many allow groups.\n",
498: filename, linenum);
499: exit(1);
500: }
501: options->allow_groups[options->num_allow_groups++] = xstrdup(cp);
502: }
503: break;
504:
505: case sDenyGroups:
506: while ((cp = strtok(NULL, WHITESPACE))) {
507: if (options->num_deny_groups >= MAX_DENY_GROUPS) {
508: fprintf(stderr, "%s line %d: too many deny groups.\n",
509: filename, linenum);
510: exit(1);
511: }
512: options->deny_groups[options->num_deny_groups++] = xstrdup(cp);
513: }
514: break;
515:
516: default:
517: fprintf(stderr, "%s line %d: Missing handler for opcode %s (%d)\n",
518: filename, linenum, cp, opcode);
519: exit(1);
1.13 markus 520: }
1.25 markus 521: if (strtok(NULL, WHITESPACE) != NULL) {
522: fprintf(stderr, "%s line %d: garbage at end of line.\n",
523: filename, linenum);
524: exit(1);
1.13 markus 525: }
1.1 deraadt 526: }
1.25 markus 527: fclose(f);
528: if (bad_options > 0) {
529: fprintf(stderr, "%s: terminating, %d bad configuration options\n",
530: filename, bad_options);
531: exit(1);
1.1 deraadt 532: }
533: }