Annotation of src/usr.bin/ssh/servconf.c, Revision 1.19
1.1 deraadt 1: /*
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: */
13:
14: #include "includes.h"
1.19 ! markus 15: RCSID("$Id: servconf.c,v 1.18 1999/10/17 23:09:16 dugsong 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:
23: void initialize_server_options(ServerOptions *options)
24: {
25: memset(options, 0, sizeof(*options));
26: options->port = -1;
1.3 deraadt 27: options->listen_addr.s_addr = htonl(INADDR_ANY);
1.1 deraadt 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;
1.11 markus 37: options->check_mail = -1;
1.1 deraadt 38: options->x11_forwarding = -1;
1.2 deraadt 39: options->x11_display_offset = -1;
1.1 deraadt 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
1.4 dugsong 51: #ifdef AFS
1.1 deraadt 52: options->kerberos_tgt_passing = -1;
53: options->afs_token_passing = -1;
54: #endif
55: options->password_authentication = -1;
1.10 markus 56: #ifdef SKEY
57: options->skey_authentication = -1;
58: #endif
1.1 deraadt 59: options->permit_empty_passwd = -1;
1.12 markus 60: options->use_login = -1;
1.13 markus 61: options->num_allow_users = 0;
62: options->num_deny_users = 0;
63: options->num_allow_groups = 0;
64: options->num_deny_groups = 0;
1.1 deraadt 65: }
66:
67: void 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)
1.15 markus 89: options->permit_root_login = 1; /* yes */
1.1 deraadt 90: if (options->ignore_rhosts == -1)
91: options->ignore_rhosts = 0;
92: if (options->quiet_mode == -1)
93: options->quiet_mode = 0;
1.11 markus 94: if (options->check_mail == -1)
95: options->check_mail = 0;
1.1 deraadt 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;
1.2 deraadt 102: if (options->x11_display_offset == -1)
103: options->x11_display_offset = 1;
1.1 deraadt 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))
1.19 ! markus 109: options->log_facility = SYSLOG_FACILITY_AUTH;
1.1 deraadt 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)
1.5 dugsong 118: options->kerberos_authentication = (access(KEYFILE, R_OK) == 0);
1.1 deraadt 119: if (options->kerberos_or_local_passwd == -1)
1.18 dugsong 120: options->kerberos_or_local_passwd = 1;
1.1 deraadt 121: if (options->kerberos_ticket_cleanup == -1)
122: options->kerberos_ticket_cleanup = 1;
1.4 dugsong 123: #endif /* KRB4 */
124: #ifdef AFS
1.1 deraadt 125: if (options->kerberos_tgt_passing == -1)
126: options->kerberos_tgt_passing = 0;
127: if (options->afs_token_passing == -1)
1.5 dugsong 128: options->afs_token_passing = k_hasafs();
1.4 dugsong 129: #endif /* AFS */
1.1 deraadt 130: if (options->password_authentication == -1)
131: options->password_authentication = 1;
1.10 markus 132: #ifdef SKEY
133: if (options->skey_authentication == -1)
134: options->skey_authentication = 1;
135: #endif
1.1 deraadt 136: if (options->permit_empty_passwd == -1)
1.10 markus 137: options->permit_empty_passwd = 1;
1.12 markus 138: if (options->use_login == -1)
139: options->use_login = 0;
1.1 deraadt 140: }
141:
142: #define WHITESPACE " \t\r\n"
143:
144: /* Keyword tokens. */
145: typedef enum
146: {
147: sPort, sHostKeyFile, sServerKeyBits, sLoginGraceTime, sKeyRegenerationTime,
148: sPermitRootLogin, sQuietMode, sFascistLogging, sLogFacility,
149: sRhostsAuthentication, sRhostsRSAAuthentication, sRSAAuthentication,
150: #ifdef KRB4
1.4 dugsong 151: sKerberosAuthentication, sKerberosOrLocalPasswd, sKerberosTicketCleanup,
1.1 deraadt 152: #endif
153: #ifdef AFS
1.4 dugsong 154: sKerberosTgtPassing, sAFSTokenPassing,
1.1 deraadt 155: #endif
1.10 markus 156: #ifdef SKEY
157: sSkeyAuthentication,
158: #endif
1.17 dugsong 159: sPasswordAuthentication, sListenAddress,
1.2 deraadt 160: sPrintMotd, sIgnoreRhosts, sX11Forwarding, sX11DisplayOffset,
1.12 markus 161: sStrictModes, sEmptyPasswd, sRandomSeedFile, sKeepAlives, sCheckMail,
1.17 dugsong 162: sUseLogin, sAllowUsers, sDenyUsers, sAllowGroups, sDenyGroups
1.13 markus 163:
1.1 deraadt 164: } ServerOpCodes;
165:
166: /* Textual representation of the tokens. */
167: static 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
1.4 dugsong 190: #ifdef AFS
1.1 deraadt 191: { "kerberostgtpassing", sKerberosTgtPassing },
192: { "afstokenpassing", sAFSTokenPassing },
193: #endif
194: { "passwordauthentication", sPasswordAuthentication },
1.10 markus 195: #ifdef SKEY
196: { "skeyauthentication", sSkeyAuthentication },
197: #endif
1.11 markus 198: { "checkmail", sCheckMail },
1.1 deraadt 199: { "listenaddress", sListenAddress },
200: { "printmotd", sPrintMotd },
201: { "ignorerhosts", sIgnoreRhosts },
202: { "x11forwarding", sX11Forwarding },
1.2 deraadt 203: { "x11displayoffset", sX11DisplayOffset },
1.1 deraadt 204: { "strictmodes", sStrictModes },
205: { "permitemptypasswords", sEmptyPasswd },
1.12 markus 206: { "uselogin", sUseLogin },
1.1 deraadt 207: { "randomseed", sRandomSeedFile },
208: { "keepalive", sKeepAlives },
1.13 markus 209: { "allowusers", sAllowUsers },
210: { "denyusers", sDenyUsers },
211: { "allowgroups", sAllowGroups },
212: { "denygroups", sDenyGroups },
1.1 deraadt 213: { NULL, 0 }
214: };
215:
216: static 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:
239: static 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:
255: void 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);
1.16 markus 267: exit(1);
1.1 deraadt 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:
1.8 deraadt 340: fprintf(stderr, "%s line %d: \"randomseed\" option is obsolete.\n",
1.7 provos 341: filename, linenum);
342: cp = strtok(NULL, WHITESPACE);
343: break;
1.1 deraadt 344:
345: case sPermitRootLogin:
346: intptr = &options->permit_root_login;
1.15 markus 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;
1.1 deraadt 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:
1.4 dugsong 429: #ifdef AFS
1.1 deraadt 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;
1.11 markus 442:
443: case sCheckMail:
444: intptr = &options->check_mail;
445: goto parse_flag;
1.10 markus 446:
447: #ifdef SKEY
448: case sSkeyAuthentication:
449: intptr = &options->skey_authentication;
450: goto parse_flag;
451: #endif
1.1 deraadt 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;
1.2 deraadt 460:
461: case sX11DisplayOffset:
462: intptr = &options->x11_display_offset;
463: goto parse_int;
1.1 deraadt 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;
1.12 markus 476:
477: case sUseLogin:
478: intptr = &options->use_login;
1.14 markus 479: goto parse_flag;
480:
1.1 deraadt 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:
1.13 markus 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);
1.1 deraadt 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: }
![[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