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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"
1.28 ! markus 15: RCSID("$Id: servconf.c,v 1.27 1999/11/24 19:53:50 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:
1.27 markus 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: */
1.1 deraadt 219:
1.25 markus 220: static ServerOpCodes
221: parse_token(const char *cp, const char *filename,
222: int linenum)
1.1 deraadt 223: {
1.25 markus 224: unsigned int i;
1.1 deraadt 225:
1.25 markus 226: for (i = 0; keywords[i].name; i++)
1.28 ! markus 227: if (strcasecmp(cp, keywords[i].name) == 0)
1.25 markus 228: return keywords[i].opcode;
229:
230: fprintf(stderr, "%s: line %d: Bad configuration option: %s\n",
231: filename, linenum, cp);
232: return sBadOption;
1.1 deraadt 233: }
234:
235: /* Reads the server configuration file. */
236:
1.25 markus 237: void
238: read_server_config(ServerOptions *options, const char *filename)
1.1 deraadt 239: {
1.25 markus 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);
1.1 deraadt 250: exit(1);
1.25 markus 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:
1.1 deraadt 379: #ifdef KRB4
1.25 markus 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;
1.1 deraadt 391: #endif
1.25 markus 392:
1.4 dugsong 393: #ifdef AFS
1.25 markus 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;
1.10 markus 410:
411: #ifdef SKEY
1.25 markus 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);
1.13 markus 515: }
1.25 markus 516: if (strtok(NULL, WHITESPACE) != NULL) {
517: fprintf(stderr, "%s line %d: garbage at end of line.\n",
518: filename, linenum);
519: exit(1);
1.13 markus 520: }
1.1 deraadt 521: }
1.25 markus 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);
1.1 deraadt 527: }
528: }