Annotation of src/usr.bin/ssh/servconf.c, Revision 1.30
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"
1.30 ! markus 15: RCSID("$Id: servconf.c,v 1.29 2000/01/04 00:07:59 markus Exp $");
1.1 deraadt 16:
17: #include "ssh.h"
18: #include "servconf.h"
19: #include "xmalloc.h"
20:
1.29 markus 21: /* add listen address */
22: void add_listen_addr(ServerOptions *options, char *addr);
23:
1.1 deraadt 24: /* Initializes the server options to their default values. */
25:
1.25 markus 26: void
27: initialize_server_options(ServerOptions *options)
1.1 deraadt 28: {
1.25 markus 29: memset(options, 0, sizeof(*options));
1.29 markus 30: options->num_ports = 0;
31: options->ports_from_cmdline = 0;
32: options->listen_addrs = NULL;
1.25 markus 33: options->host_key_file = NULL;
34: options->server_key_bits = -1;
35: options->login_grace_time = -1;
36: options->key_regeneration_time = -1;
37: options->permit_root_login = -1;
38: options->ignore_rhosts = -1;
39: options->ignore_user_known_hosts = -1;
40: options->print_motd = -1;
41: options->check_mail = -1;
42: options->x11_forwarding = -1;
43: options->x11_display_offset = -1;
44: options->strict_modes = -1;
45: options->keepalives = -1;
46: options->log_facility = (SyslogFacility) - 1;
47: options->log_level = (LogLevel) - 1;
48: options->rhosts_authentication = -1;
49: options->rhosts_rsa_authentication = -1;
50: options->rsa_authentication = -1;
1.1 deraadt 51: #ifdef KRB4
1.25 markus 52: options->kerberos_authentication = -1;
53: options->kerberos_or_local_passwd = -1;
54: options->kerberos_ticket_cleanup = -1;
1.1 deraadt 55: #endif
1.4 dugsong 56: #ifdef AFS
1.25 markus 57: options->kerberos_tgt_passing = -1;
58: options->afs_token_passing = -1;
1.1 deraadt 59: #endif
1.25 markus 60: options->password_authentication = -1;
1.10 markus 61: #ifdef SKEY
1.25 markus 62: options->skey_authentication = -1;
1.10 markus 63: #endif
1.25 markus 64: options->permit_empty_passwd = -1;
65: options->use_login = -1;
66: options->num_allow_users = 0;
67: options->num_deny_users = 0;
68: options->num_allow_groups = 0;
69: options->num_deny_groups = 0;
1.1 deraadt 70: }
71:
1.25 markus 72: void
73: fill_default_server_options(ServerOptions *options)
1.1 deraadt 74: {
1.29 markus 75: if (options->num_ports == 0)
76: options->ports[options->num_ports++] = SSH_DEFAULT_PORT;
77: if (options->listen_addrs == NULL)
78: add_listen_addr(options, NULL);
1.25 markus 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)
1.30 ! markus 90: options->ignore_rhosts = 1;
1.25 markus 91: if (options->ignore_user_known_hosts == -1)
92: options->ignore_user_known_hosts = 0;
93: if (options->check_mail == -1)
94: options->check_mail = 0;
95: if (options->print_motd == -1)
96: options->print_motd = 1;
97: if (options->x11_forwarding == -1)
1.30 ! markus 98: options->x11_forwarding = 0;
1.25 markus 99: if (options->x11_display_offset == -1)
1.30 ! markus 100: options->x11_display_offset = 10;
1.25 markus 101: if (options->strict_modes == -1)
102: options->strict_modes = 1;
103: if (options->keepalives == -1)
104: options->keepalives = 1;
105: if (options->log_facility == (SyslogFacility) (-1))
106: options->log_facility = SYSLOG_FACILITY_AUTH;
107: if (options->log_level == (LogLevel) (-1))
108: options->log_level = SYSLOG_LEVEL_INFO;
109: if (options->rhosts_authentication == -1)
110: options->rhosts_authentication = 0;
111: if (options->rhosts_rsa_authentication == -1)
1.30 ! markus 112: options->rhosts_rsa_authentication = 0;
1.25 markus 113: if (options->rsa_authentication == -1)
114: options->rsa_authentication = 1;
1.1 deraadt 115: #ifdef KRB4
1.25 markus 116: if (options->kerberos_authentication == -1)
117: options->kerberos_authentication = (access(KEYFILE, R_OK) == 0);
118: if (options->kerberos_or_local_passwd == -1)
119: options->kerberos_or_local_passwd = 1;
120: if (options->kerberos_ticket_cleanup == -1)
121: options->kerberos_ticket_cleanup = 1;
1.4 dugsong 122: #endif /* KRB4 */
123: #ifdef AFS
1.25 markus 124: if (options->kerberos_tgt_passing == -1)
125: options->kerberos_tgt_passing = 0;
126: if (options->afs_token_passing == -1)
127: options->afs_token_passing = k_hasafs();
1.4 dugsong 128: #endif /* AFS */
1.25 markus 129: if (options->password_authentication == -1)
130: options->password_authentication = 1;
1.10 markus 131: #ifdef SKEY
1.25 markus 132: if (options->skey_authentication == -1)
133: options->skey_authentication = 1;
1.10 markus 134: #endif
1.25 markus 135: if (options->permit_empty_passwd == -1)
1.30 ! markus 136: options->permit_empty_passwd = 0;
1.25 markus 137: if (options->use_login == -1)
138: options->use_login = 0;
1.1 deraadt 139: }
140:
141: #define WHITESPACE " \t\r\n"
142:
143: /* Keyword tokens. */
1.25 markus 144: typedef enum {
145: sBadOption, /* == unknown option */
146: sPort, sHostKeyFile, sServerKeyBits, sLoginGraceTime, sKeyRegenerationTime,
147: sPermitRootLogin, sLogFacility, sLogLevel,
148: sRhostsAuthentication, sRhostsRSAAuthentication, sRSAAuthentication,
1.1 deraadt 149: #ifdef KRB4
1.25 markus 150: sKerberosAuthentication, sKerberosOrLocalPasswd, sKerberosTicketCleanup,
1.1 deraadt 151: #endif
152: #ifdef AFS
1.25 markus 153: sKerberosTgtPassing, sAFSTokenPassing,
1.1 deraadt 154: #endif
1.10 markus 155: #ifdef SKEY
1.25 markus 156: sSkeyAuthentication,
1.10 markus 157: #endif
1.25 markus 158: sPasswordAuthentication, sListenAddress,
159: sPrintMotd, sIgnoreRhosts, sX11Forwarding, sX11DisplayOffset,
160: sStrictModes, sEmptyPasswd, sRandomSeedFile, sKeepAlives, sCheckMail,
161: sUseLogin, sAllowUsers, sDenyUsers, sAllowGroups, sDenyGroups,
162: sIgnoreUserKnownHosts
1.1 deraadt 163: } ServerOpCodes;
164:
165: /* Textual representation of the tokens. */
1.25 markus 166: static struct {
167: const char *name;
168: ServerOpCodes opcode;
169: } keywords[] = {
170: { "port", sPort },
171: { "hostkey", sHostKeyFile },
172: { "serverkeybits", sServerKeyBits },
173: { "logingracetime", sLoginGraceTime },
174: { "keyregenerationinterval", sKeyRegenerationTime },
175: { "permitrootlogin", sPermitRootLogin },
176: { "syslogfacility", sLogFacility },
177: { "loglevel", sLogLevel },
178: { "rhostsauthentication", sRhostsAuthentication },
179: { "rhostsrsaauthentication", sRhostsRSAAuthentication },
180: { "rsaauthentication", sRSAAuthentication },
1.1 deraadt 181: #ifdef KRB4
1.25 markus 182: { "kerberosauthentication", sKerberosAuthentication },
183: { "kerberosorlocalpasswd", sKerberosOrLocalPasswd },
184: { "kerberosticketcleanup", sKerberosTicketCleanup },
1.1 deraadt 185: #endif
1.4 dugsong 186: #ifdef AFS
1.25 markus 187: { "kerberostgtpassing", sKerberosTgtPassing },
188: { "afstokenpassing", sAFSTokenPassing },
1.1 deraadt 189: #endif
1.25 markus 190: { "passwordauthentication", sPasswordAuthentication },
1.10 markus 191: #ifdef SKEY
1.25 markus 192: { "skeyauthentication", sSkeyAuthentication },
1.10 markus 193: #endif
1.25 markus 194: { "checkmail", sCheckMail },
195: { "listenaddress", sListenAddress },
196: { "printmotd", sPrintMotd },
197: { "ignorerhosts", sIgnoreRhosts },
198: { "ignoreuserknownhosts", sIgnoreUserKnownHosts },
199: { "x11forwarding", sX11Forwarding },
200: { "x11displayoffset", sX11DisplayOffset },
201: { "strictmodes", sStrictModes },
202: { "permitemptypasswords", sEmptyPasswd },
203: { "uselogin", sUseLogin },
204: { "randomseed", sRandomSeedFile },
205: { "keepalive", sKeepAlives },
206: { "allowusers", sAllowUsers },
207: { "denyusers", sDenyUsers },
208: { "allowgroups", sAllowGroups },
209: { "denygroups", sDenyGroups },
210: { NULL, 0 }
1.1 deraadt 211: };
212:
1.27 markus 213: /*
214: * Returns the number of the token pointed to by cp of length len. Never
215: * returns if the token is not known.
216: */
1.1 deraadt 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++)
1.28 markus 225: if (strcasecmp(cp, keywords[i].name) == 0)
1.25 markus 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:
1.29 markus 233: /*
234: * add listen address
235: */
236: void
237: add_listen_addr(ServerOptions *options, char *addr)
238: {
239: extern int IPv4or6;
240: struct addrinfo hints, *ai, *aitop;
241: char strport[NI_MAXSERV];
242: int gaierr;
243: int i;
244:
245: if (options->num_ports == 0)
246: options->ports[options->num_ports++] = SSH_DEFAULT_PORT;
247: for (i = 0; i < options->num_ports; i++) {
248: memset(&hints, 0, sizeof(hints));
249: hints.ai_family = IPv4or6;
250: hints.ai_socktype = SOCK_STREAM;
251: hints.ai_flags = (addr == NULL) ? AI_PASSIVE : 0;
252: snprintf(strport, sizeof strport, "%d", options->ports[i]);
253: if ((gaierr = getaddrinfo(addr, strport, &hints, &aitop)) != 0)
254: fatal("bad addr or host: %s (%s)\n",
255: addr ? addr : "<NULL>",
256: gai_strerror(gaierr));
257: for (ai = aitop; ai->ai_next; ai = ai->ai_next)
258: ;
259: ai->ai_next = options->listen_addrs;
260: options->listen_addrs = aitop;
261: }
262: }
263:
1.1 deraadt 264: /* Reads the server configuration file. */
265:
1.25 markus 266: void
267: read_server_config(ServerOptions *options, const char *filename)
1.1 deraadt 268: {
1.25 markus 269: FILE *f;
270: char line[1024];
271: char *cp, **charptr;
272: int linenum, *intptr, value;
273: int bad_options = 0;
274: ServerOpCodes opcode;
275:
276: f = fopen(filename, "r");
277: if (!f) {
278: perror(filename);
1.1 deraadt 279: exit(1);
1.25 markus 280: }
281: linenum = 0;
282: while (fgets(line, sizeof(line), f)) {
283: linenum++;
284: cp = line + strspn(line, WHITESPACE);
285: if (!*cp || *cp == '#')
286: continue;
287: cp = strtok(cp, WHITESPACE);
288: opcode = parse_token(cp, filename, linenum);
289: switch (opcode) {
290: case sBadOption:
291: bad_options++;
292: continue;
293: case sPort:
1.29 markus 294: /* ignore ports from configfile if cmdline specifies ports */
295: if (options->ports_from_cmdline)
296: continue;
297: if (options->listen_addrs != NULL)
298: fatal("%s line %d: ports must be specified before "
299: "ListenAdress.\n", filename, linenum);
300: if (options->num_ports >= MAX_PORTS)
301: fatal("%s line %d: too many ports.\n",
302: filename, linenum);
303: cp = strtok(NULL, WHITESPACE);
304: if (!cp)
305: fatal("%s line %d: missing port number.\n",
306: filename, linenum);
307: options->ports[options->num_ports++] = atoi(cp);
308: break;
309:
310: case sServerKeyBits:
311: intptr = &options->server_key_bits;
1.25 markus 312: parse_int:
313: cp = strtok(NULL, WHITESPACE);
314: if (!cp) {
315: fprintf(stderr, "%s line %d: missing integer value.\n",
316: filename, linenum);
317: exit(1);
318: }
319: value = atoi(cp);
320: if (*intptr == -1)
321: *intptr = value;
322: break;
323:
324: case sLoginGraceTime:
325: intptr = &options->login_grace_time;
326: goto parse_int;
327:
328: case sKeyRegenerationTime:
329: intptr = &options->key_regeneration_time;
330: goto parse_int;
331:
332: case sListenAddress:
333: cp = strtok(NULL, WHITESPACE);
1.29 markus 334: if (!cp)
335: fatal("%s line %d: missing inet addr.\n",
336: filename, linenum);
337: add_listen_addr(options, cp);
1.25 markus 338: break;
339:
340: case sHostKeyFile:
341: charptr = &options->host_key_file;
342: cp = strtok(NULL, WHITESPACE);
343: if (!cp) {
344: fprintf(stderr, "%s line %d: missing file name.\n",
345: filename, linenum);
346: exit(1);
347: }
348: if (*charptr == NULL)
349: *charptr = tilde_expand_filename(cp, getuid());
350: break;
351:
352: case sRandomSeedFile:
353: fprintf(stderr, "%s line %d: \"randomseed\" option is obsolete.\n",
354: filename, linenum);
355: cp = strtok(NULL, WHITESPACE);
356: break;
357:
358: case sPermitRootLogin:
359: intptr = &options->permit_root_login;
360: cp = strtok(NULL, WHITESPACE);
361: if (!cp) {
362: fprintf(stderr, "%s line %d: missing yes/without-password/no argument.\n",
363: filename, linenum);
364: exit(1);
365: }
366: if (strcmp(cp, "without-password") == 0)
367: value = 2;
368: else if (strcmp(cp, "yes") == 0)
369: value = 1;
370: else if (strcmp(cp, "no") == 0)
371: value = 0;
372: else {
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: fprintf(stderr, "%s line %d: missing yes/no argument.\n",
387: filename, linenum);
388: exit(1);
389: }
390: if (strcmp(cp, "yes") == 0)
391: value = 1;
392: else if (strcmp(cp, "no") == 0)
393: value = 0;
394: else {
395: fprintf(stderr, "%s line %d: Bad yes/no argument: %s\n",
396: filename, linenum, cp);
397: exit(1);
398: }
399: if (*intptr == -1)
400: *intptr = value;
401: break;
402:
403: case sIgnoreUserKnownHosts:
404: intptr = &options->ignore_user_known_hosts;
405: goto parse_int;
406:
407: case sRhostsAuthentication:
408: intptr = &options->rhosts_authentication;
409: goto parse_flag;
410:
411: case sRhostsRSAAuthentication:
412: intptr = &options->rhosts_rsa_authentication;
413: goto parse_flag;
414:
415: case sRSAAuthentication:
416: intptr = &options->rsa_authentication;
417: goto parse_flag;
418:
1.1 deraadt 419: #ifdef KRB4
1.25 markus 420: case sKerberosAuthentication:
421: intptr = &options->kerberos_authentication;
422: goto parse_flag;
423:
424: case sKerberosOrLocalPasswd:
425: intptr = &options->kerberos_or_local_passwd;
426: goto parse_flag;
427:
428: case sKerberosTicketCleanup:
429: intptr = &options->kerberos_ticket_cleanup;
430: goto parse_flag;
1.1 deraadt 431: #endif
1.25 markus 432:
1.4 dugsong 433: #ifdef AFS
1.25 markus 434: case sKerberosTgtPassing:
435: intptr = &options->kerberos_tgt_passing;
436: goto parse_flag;
437:
438: case sAFSTokenPassing:
439: intptr = &options->afs_token_passing;
440: goto parse_flag;
441: #endif
442:
443: case sPasswordAuthentication:
444: intptr = &options->password_authentication;
445: goto parse_flag;
446:
447: case sCheckMail:
448: intptr = &options->check_mail;
449: goto parse_flag;
1.10 markus 450:
451: #ifdef SKEY
1.25 markus 452: case sSkeyAuthentication:
453: intptr = &options->skey_authentication;
454: goto parse_flag;
455: #endif
456:
457: case sPrintMotd:
458: intptr = &options->print_motd;
459: goto parse_flag;
460:
461: case sX11Forwarding:
462: intptr = &options->x11_forwarding;
463: goto parse_flag;
464:
465: case sX11DisplayOffset:
466: intptr = &options->x11_display_offset;
467: goto parse_int;
468:
469: case sStrictModes:
470: intptr = &options->strict_modes;
471: goto parse_flag;
472:
473: case sKeepAlives:
474: intptr = &options->keepalives;
475: goto parse_flag;
476:
477: case sEmptyPasswd:
478: intptr = &options->permit_empty_passwd;
479: goto parse_flag;
480:
481: case sUseLogin:
482: intptr = &options->use_login;
483: goto parse_flag;
484:
485: case sLogFacility:
486: intptr = (int *) &options->log_facility;
487: cp = strtok(NULL, WHITESPACE);
488: value = log_facility_number(cp);
489: if (value == (SyslogFacility) - 1)
490: fatal("%.200s line %d: unsupported log facility '%s'\n",
491: filename, linenum, cp ? cp : "<NONE>");
492: if (*intptr == -1)
493: *intptr = (SyslogFacility) value;
494: break;
495:
496: case sLogLevel:
497: intptr = (int *) &options->log_level;
498: cp = strtok(NULL, WHITESPACE);
499: value = log_level_number(cp);
500: if (value == (LogLevel) - 1)
501: fatal("%.200s line %d: unsupported log level '%s'\n",
502: filename, linenum, cp ? cp : "<NONE>");
503: if (*intptr == -1)
504: *intptr = (LogLevel) value;
505: break;
506:
507: case sAllowUsers:
508: while ((cp = strtok(NULL, WHITESPACE))) {
509: if (options->num_allow_users >= MAX_ALLOW_USERS) {
510: fprintf(stderr, "%s line %d: too many allow users.\n",
511: filename, linenum);
512: exit(1);
513: }
514: options->allow_users[options->num_allow_users++] = xstrdup(cp);
515: }
516: break;
517:
518: case sDenyUsers:
519: while ((cp = strtok(NULL, WHITESPACE))) {
520: if (options->num_deny_users >= MAX_DENY_USERS) {
521: fprintf(stderr, "%s line %d: too many deny users.\n",
522: filename, linenum);
523: exit(1);
524: }
525: options->deny_users[options->num_deny_users++] = xstrdup(cp);
526: }
527: break;
528:
529: case sAllowGroups:
530: while ((cp = strtok(NULL, WHITESPACE))) {
531: if (options->num_allow_groups >= MAX_ALLOW_GROUPS) {
532: fprintf(stderr, "%s line %d: too many allow groups.\n",
533: filename, linenum);
534: exit(1);
535: }
536: options->allow_groups[options->num_allow_groups++] = xstrdup(cp);
537: }
538: break;
539:
540: case sDenyGroups:
541: while ((cp = strtok(NULL, WHITESPACE))) {
542: if (options->num_deny_groups >= MAX_DENY_GROUPS) {
543: fprintf(stderr, "%s line %d: too many deny groups.\n",
544: filename, linenum);
545: exit(1);
546: }
547: options->deny_groups[options->num_deny_groups++] = xstrdup(cp);
548: }
549: break;
550:
551: default:
552: fprintf(stderr, "%s line %d: Missing handler for opcode %s (%d)\n",
553: filename, linenum, cp, opcode);
554: exit(1);
1.13 markus 555: }
1.25 markus 556: if (strtok(NULL, WHITESPACE) != NULL) {
557: fprintf(stderr, "%s line %d: garbage at end of line.\n",
558: filename, linenum);
559: exit(1);
1.13 markus 560: }
1.1 deraadt 561: }
1.25 markus 562: fclose(f);
563: if (bad_options > 0) {
564: fprintf(stderr, "%s: terminating, %d bad configuration options\n",
565: filename, bad_options);
566: exit(1);
1.1 deraadt 567: }
568: }
![[BACK]](/icons/back.gif){kind=icon}
Return to servconf.c CVS log ![[TXT]](/icons/text.gif){kind=icon}
![[DIR]](/icons/dir.gif){kind=icon}
Up to [local] / src / usr.bin / ssh