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1 | /* | |
2 | * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland | |
3 | * All rights reserved | |
4 | * | |
5 | * As far as I am concerned, the code I have written for this software | |
6 | * can be used freely for any purpose. Any derived versions of this | |
7 | * software must be clearly marked as such, and if the derived work is | |
8 | * incompatible with the protocol description in the RFC file, it must be | |
9 | * called by a name other than "ssh" or "Secure Shell". | |
10 | */ | |
11 | ||
12 | #include "includes.h" | |
13 | RCSID("$OpenBSD: servconf.c,v 1.105 2002/03/20 19:12:24 stevesk Exp $"); | |
14 | ||
15 | #if defined(KRB4) || defined(KRB5) | |
16 | #include <krb.h> | |
17 | #endif | |
18 | #ifdef AFS | |
19 | #include <kafs.h> | |
20 | #endif | |
21 | ||
22 | #include "ssh.h" | |
23 | #include "log.h" | |
24 | #include "servconf.h" | |
25 | #include "xmalloc.h" | |
26 | #include "compat.h" | |
27 | #include "pathnames.h" | |
28 | #include "tildexpand.h" | |
29 | #include "misc.h" | |
30 | #include "cipher.h" | |
31 | #include "kex.h" | |
32 | #include "mac.h" | |
33 | ||
34 | static void add_listen_addr(ServerOptions *, char *, u_short); | |
35 | static void add_one_listen_addr(ServerOptions *, char *, u_short); | |
36 | ||
37 | /* AF_UNSPEC or AF_INET or AF_INET6 */ | |
38 | extern int IPv4or6; | |
39 | /* Use of privilege separation or not */ | |
40 | extern int use_privsep; | |
41 | ||
42 | /* Initializes the server options to their default values. */ | |
43 | ||
44 | void | |
45 | initialize_server_options(ServerOptions *options) | |
46 | { | |
47 | memset(options, 0, sizeof(*options)); | |
48 | ||
49 | /* Portable-specific options */ | |
50 | options->pam_authentication_via_kbd_int = -1; | |
51 | ||
52 | /* Standard Options */ | |
53 | options->num_ports = 0; | |
54 | options->ports_from_cmdline = 0; | |
55 | options->listen_addrs = NULL; | |
56 | options->num_host_key_files = 0; | |
57 | options->pid_file = NULL; | |
58 | options->server_key_bits = -1; | |
59 | options->login_grace_time = -1; | |
60 | options->key_regeneration_time = -1; | |
61 | options->permit_root_login = PERMIT_NOT_SET; | |
62 | options->ignore_rhosts = -1; | |
63 | options->ignore_user_known_hosts = -1; | |
64 | options->print_motd = -1; | |
65 | options->print_lastlog = -1; | |
66 | options->x11_forwarding = -1; | |
67 | options->x11_display_offset = -1; | |
68 | options->x11_use_localhost = -1; | |
69 | options->xauth_location = NULL; | |
70 | options->strict_modes = -1; | |
71 | options->keepalives = -1; | |
72 | options->log_facility = SYSLOG_FACILITY_NOT_SET; | |
73 | options->log_level = SYSLOG_LEVEL_NOT_SET; | |
74 | options->rhosts_authentication = -1; | |
75 | options->rhosts_rsa_authentication = -1; | |
76 | options->hostbased_authentication = -1; | |
77 | options->hostbased_uses_name_from_packet_only = -1; | |
78 | options->rsa_authentication = -1; | |
79 | options->pubkey_authentication = -1; | |
80 | #if defined(KRB4) || defined(KRB5) | |
81 | options->kerberos_authentication = -1; | |
82 | options->kerberos_or_local_passwd = -1; | |
83 | options->kerberos_ticket_cleanup = -1; | |
84 | #endif | |
85 | #if defined(AFS) || defined(KRB5) | |
86 | options->kerberos_tgt_passing = -1; | |
87 | #endif | |
88 | #ifdef AFS | |
89 | options->afs_token_passing = -1; | |
90 | #endif | |
91 | options->password_authentication = -1; | |
92 | options->kbd_interactive_authentication = -1; | |
93 | options->challenge_response_authentication = -1; | |
94 | options->permit_empty_passwd = -1; | |
95 | options->use_login = -1; | |
96 | options->allow_tcp_forwarding = -1; | |
97 | options->num_allow_users = 0; | |
98 | options->num_deny_users = 0; | |
99 | options->num_allow_groups = 0; | |
100 | options->num_deny_groups = 0; | |
101 | options->ciphers = NULL; | |
102 | options->macs = NULL; | |
103 | options->protocol = SSH_PROTO_UNKNOWN; | |
104 | options->gateway_ports = -1; | |
105 | options->num_subsystems = 0; | |
106 | options->max_startups_begin = -1; | |
107 | options->max_startups_rate = -1; | |
108 | options->max_startups = -1; | |
109 | options->banner = NULL; | |
110 | options->verify_reverse_mapping = -1; | |
111 | options->client_alive_interval = -1; | |
112 | options->client_alive_count_max = -1; | |
113 | options->authorized_keys_file = NULL; | |
114 | options->authorized_keys_file2 = NULL; | |
115 | ||
116 | /* Needs to be accessable in many places */ | |
117 | use_privsep = -1; | |
118 | } | |
119 | ||
120 | void | |
121 | fill_default_server_options(ServerOptions *options) | |
122 | { | |
123 | /* Portable-specific options */ | |
124 | if (options->pam_authentication_via_kbd_int == -1) | |
125 | options->pam_authentication_via_kbd_int = 0; | |
126 | ||
127 | /* Standard Options */ | |
128 | if (options->protocol == SSH_PROTO_UNKNOWN) | |
129 | options->protocol = SSH_PROTO_1|SSH_PROTO_2; | |
130 | if (options->num_host_key_files == 0) { | |
131 | /* fill default hostkeys for protocols */ | |
132 | if (options->protocol & SSH_PROTO_1) | |
133 | options->host_key_files[options->num_host_key_files++] = | |
134 | _PATH_HOST_KEY_FILE; | |
135 | if (options->protocol & SSH_PROTO_2) { | |
136 | options->host_key_files[options->num_host_key_files++] = | |
137 | _PATH_HOST_RSA_KEY_FILE; | |
138 | options->host_key_files[options->num_host_key_files++] = | |
139 | _PATH_HOST_DSA_KEY_FILE; | |
140 | } | |
141 | } | |
142 | if (options->num_ports == 0) | |
143 | options->ports[options->num_ports++] = SSH_DEFAULT_PORT; | |
144 | if (options->listen_addrs == NULL) | |
145 | add_listen_addr(options, NULL, 0); | |
146 | if (options->pid_file == NULL) | |
147 | options->pid_file = _PATH_SSH_DAEMON_PID_FILE; | |
148 | if (options->server_key_bits == -1) | |
149 | options->server_key_bits = 768; | |
150 | if (options->login_grace_time == -1) | |
151 | options->login_grace_time = 600; | |
152 | if (options->key_regeneration_time == -1) | |
153 | options->key_regeneration_time = 3600; | |
154 | if (options->permit_root_login == PERMIT_NOT_SET) | |
155 | options->permit_root_login = PERMIT_YES; | |
156 | if (options->ignore_rhosts == -1) | |
157 | options->ignore_rhosts = 1; | |
158 | if (options->ignore_user_known_hosts == -1) | |
159 | options->ignore_user_known_hosts = 0; | |
160 | if (options->print_motd == -1) | |
161 | options->print_motd = 1; | |
162 | if (options->print_lastlog == -1) | |
163 | options->print_lastlog = 1; | |
164 | if (options->x11_forwarding == -1) | |
165 | options->x11_forwarding = 0; | |
166 | if (options->x11_display_offset == -1) | |
167 | options->x11_display_offset = 10; | |
168 | if (options->x11_use_localhost == -1) | |
169 | options->x11_use_localhost = 1; | |
170 | if (options->xauth_location == NULL) | |
171 | options->xauth_location = _PATH_XAUTH; | |
172 | if (options->strict_modes == -1) | |
173 | options->strict_modes = 1; | |
174 | if (options->keepalives == -1) | |
175 | options->keepalives = 1; | |
176 | if (options->log_facility == SYSLOG_FACILITY_NOT_SET) | |
177 | options->log_facility = SYSLOG_FACILITY_AUTH; | |
178 | if (options->log_level == SYSLOG_LEVEL_NOT_SET) | |
179 | options->log_level = SYSLOG_LEVEL_INFO; | |
180 | if (options->rhosts_authentication == -1) | |
181 | options->rhosts_authentication = 0; | |
182 | if (options->rhosts_rsa_authentication == -1) | |
183 | options->rhosts_rsa_authentication = 0; | |
184 | if (options->hostbased_authentication == -1) | |
185 | options->hostbased_authentication = 0; | |
186 | if (options->hostbased_uses_name_from_packet_only == -1) | |
187 | options->hostbased_uses_name_from_packet_only = 0; | |
188 | if (options->rsa_authentication == -1) | |
189 | options->rsa_authentication = 1; | |
190 | if (options->pubkey_authentication == -1) | |
191 | options->pubkey_authentication = 1; | |
192 | #if defined(KRB4) || defined(KRB5) | |
193 | if (options->kerberos_authentication == -1) | |
194 | options->kerberos_authentication = (access(KEYFILE, R_OK) == 0); | |
195 | if (options->kerberos_or_local_passwd == -1) | |
196 | options->kerberos_or_local_passwd = 1; | |
197 | if (options->kerberos_ticket_cleanup == -1) | |
198 | options->kerberos_ticket_cleanup = 1; | |
199 | #endif | |
200 | #if defined(AFS) || defined(KRB5) | |
201 | if (options->kerberos_tgt_passing == -1) | |
202 | options->kerberos_tgt_passing = 0; | |
203 | #endif | |
204 | #ifdef AFS | |
205 | if (options->afs_token_passing == -1) | |
206 | options->afs_token_passing = k_hasafs(); | |
207 | #endif | |
208 | if (options->password_authentication == -1) | |
209 | options->password_authentication = 1; | |
210 | if (options->kbd_interactive_authentication == -1) | |
211 | options->kbd_interactive_authentication = 0; | |
212 | if (options->challenge_response_authentication == -1) | |
213 | options->challenge_response_authentication = 1; | |
214 | if (options->permit_empty_passwd == -1) | |
215 | options->permit_empty_passwd = 0; | |
216 | if (options->use_login == -1) | |
217 | options->use_login = 0; | |
218 | if (options->allow_tcp_forwarding == -1) | |
219 | options->allow_tcp_forwarding = 1; | |
220 | if (options->gateway_ports == -1) | |
221 | options->gateway_ports = 0; | |
222 | if (options->max_startups == -1) | |
223 | options->max_startups = 10; | |
224 | if (options->max_startups_rate == -1) | |
225 | options->max_startups_rate = 100; /* 100% */ | |
226 | if (options->max_startups_begin == -1) | |
227 | options->max_startups_begin = options->max_startups; | |
228 | if (options->verify_reverse_mapping == -1) | |
229 | options->verify_reverse_mapping = 0; | |
230 | if (options->client_alive_interval == -1) | |
231 | options->client_alive_interval = 0; | |
232 | if (options->client_alive_count_max == -1) | |
233 | options->client_alive_count_max = 3; | |
234 | if (options->authorized_keys_file2 == NULL) { | |
235 | /* authorized_keys_file2 falls back to authorized_keys_file */ | |
236 | if (options->authorized_keys_file != NULL) | |
237 | options->authorized_keys_file2 = options->authorized_keys_file; | |
238 | else | |
239 | options->authorized_keys_file2 = _PATH_SSH_USER_PERMITTED_KEYS2; | |
240 | } | |
241 | if (options->authorized_keys_file == NULL) | |
242 | options->authorized_keys_file = _PATH_SSH_USER_PERMITTED_KEYS; | |
243 | ||
244 | /* Turn privilege separation _off_ by default */ | |
245 | if (use_privsep == -1) | |
246 | use_privsep = 0; | |
247 | } | |
248 | ||
249 | /* Keyword tokens. */ | |
250 | typedef enum { | |
251 | sBadOption, /* == unknown option */ | |
252 | /* Portable-specific options */ | |
253 | sPAMAuthenticationViaKbdInt, | |
254 | /* Standard Options */ | |
255 | sPort, sHostKeyFile, sServerKeyBits, sLoginGraceTime, sKeyRegenerationTime, | |
256 | sPermitRootLogin, sLogFacility, sLogLevel, | |
257 | sRhostsAuthentication, sRhostsRSAAuthentication, sRSAAuthentication, | |
258 | #if defined(KRB4) || defined(KRB5) | |
259 | sKerberosAuthentication, sKerberosOrLocalPasswd, sKerberosTicketCleanup, | |
260 | #endif | |
261 | #if defined(AFS) || defined(KRB5) | |
262 | sKerberosTgtPassing, | |
263 | #endif | |
264 | #ifdef AFS | |
265 | sAFSTokenPassing, | |
266 | #endif | |
267 | sChallengeResponseAuthentication, | |
268 | sPasswordAuthentication, sKbdInteractiveAuthentication, sListenAddress, | |
269 | sPrintMotd, sPrintLastLog, sIgnoreRhosts, | |
270 | sX11Forwarding, sX11DisplayOffset, sX11UseLocalhost, | |
271 | sStrictModes, sEmptyPasswd, sKeepAlives, | |
272 | sUseLogin, sAllowTcpForwarding, | |
273 | sAllowUsers, sDenyUsers, sAllowGroups, sDenyGroups, | |
274 | sIgnoreUserKnownHosts, sCiphers, sMacs, sProtocol, sPidFile, | |
275 | sGatewayPorts, sPubkeyAuthentication, sXAuthLocation, sSubsystem, sMaxStartups, | |
276 | sBanner, sVerifyReverseMapping, sHostbasedAuthentication, | |
277 | sHostbasedUsesNameFromPacketOnly, sClientAliveInterval, | |
278 | sClientAliveCountMax, sAuthorizedKeysFile, sAuthorizedKeysFile2, | |
279 | sUsePrivilegeSeparation, | |
280 | sDeprecated | |
281 | } ServerOpCodes; | |
282 | ||
283 | /* Textual representation of the tokens. */ | |
284 | static struct { | |
285 | const char *name; | |
286 | ServerOpCodes opcode; | |
287 | } keywords[] = { | |
288 | /* Portable-specific options */ | |
289 | { "PAMAuthenticationViaKbdInt", sPAMAuthenticationViaKbdInt }, | |
290 | /* Standard Options */ | |
291 | { "port", sPort }, | |
292 | { "hostkey", sHostKeyFile }, | |
293 | { "hostdsakey", sHostKeyFile }, /* alias */ | |
294 | { "pidfile", sPidFile }, | |
295 | { "serverkeybits", sServerKeyBits }, | |
296 | { "logingracetime", sLoginGraceTime }, | |
297 | { "keyregenerationinterval", sKeyRegenerationTime }, | |
298 | { "permitrootlogin", sPermitRootLogin }, | |
299 | { "syslogfacility", sLogFacility }, | |
300 | { "loglevel", sLogLevel }, | |
301 | { "rhostsauthentication", sRhostsAuthentication }, | |
302 | { "rhostsrsaauthentication", sRhostsRSAAuthentication }, | |
303 | { "hostbasedauthentication", sHostbasedAuthentication }, | |
304 | { "hostbasedusesnamefrompacketonly", sHostbasedUsesNameFromPacketOnly }, | |
305 | { "rsaauthentication", sRSAAuthentication }, | |
306 | { "pubkeyauthentication", sPubkeyAuthentication }, | |
307 | { "dsaauthentication", sPubkeyAuthentication }, /* alias */ | |
308 | #if defined(KRB4) || defined(KRB5) | |
309 | { "kerberosauthentication", sKerberosAuthentication }, | |
310 | { "kerberosorlocalpasswd", sKerberosOrLocalPasswd }, | |
311 | { "kerberosticketcleanup", sKerberosTicketCleanup }, | |
312 | #endif | |
313 | #if defined(AFS) || defined(KRB5) | |
314 | { "kerberostgtpassing", sKerberosTgtPassing }, | |
315 | #endif | |
316 | #ifdef AFS | |
317 | { "afstokenpassing", sAFSTokenPassing }, | |
318 | #endif | |
319 | { "passwordauthentication", sPasswordAuthentication }, | |
320 | { "kbdinteractiveauthentication", sKbdInteractiveAuthentication }, | |
321 | { "challengeresponseauthentication", sChallengeResponseAuthentication }, | |
322 | { "skeyauthentication", sChallengeResponseAuthentication }, /* alias */ | |
323 | { "checkmail", sDeprecated }, | |
324 | { "listenaddress", sListenAddress }, | |
325 | { "printmotd", sPrintMotd }, | |
326 | { "printlastlog", sPrintLastLog }, | |
327 | { "ignorerhosts", sIgnoreRhosts }, | |
328 | { "ignoreuserknownhosts", sIgnoreUserKnownHosts }, | |
329 | { "x11forwarding", sX11Forwarding }, | |
330 | { "x11displayoffset", sX11DisplayOffset }, | |
331 | { "x11uselocalhost", sX11UseLocalhost }, | |
332 | { "xauthlocation", sXAuthLocation }, | |
333 | { "strictmodes", sStrictModes }, | |
334 | { "permitemptypasswords", sEmptyPasswd }, | |
335 | { "uselogin", sUseLogin }, | |
336 | { "keepalive", sKeepAlives }, | |
337 | { "allowtcpforwarding", sAllowTcpForwarding }, | |
338 | { "allowusers", sAllowUsers }, | |
339 | { "denyusers", sDenyUsers }, | |
340 | { "allowgroups", sAllowGroups }, | |
341 | { "denygroups", sDenyGroups }, | |
342 | { "ciphers", sCiphers }, | |
343 | { "macs", sMacs }, | |
344 | { "protocol", sProtocol }, | |
345 | { "gatewayports", sGatewayPorts }, | |
346 | { "subsystem", sSubsystem }, | |
347 | { "maxstartups", sMaxStartups }, | |
348 | { "banner", sBanner }, | |
349 | { "verifyreversemapping", sVerifyReverseMapping }, | |
350 | { "reversemappingcheck", sVerifyReverseMapping }, | |
351 | { "clientaliveinterval", sClientAliveInterval }, | |
352 | { "clientalivecountmax", sClientAliveCountMax }, | |
353 | { "authorizedkeysfile", sAuthorizedKeysFile }, | |
354 | { "authorizedkeysfile2", sAuthorizedKeysFile2 }, | |
355 | { "useprivilegeseparation", sUsePrivilegeSeparation}, | |
356 | { NULL, sBadOption } | |
357 | }; | |
358 | ||
359 | /* | |
360 | * Returns the number of the token pointed to by cp or sBadOption. | |
361 | */ | |
362 | ||
363 | static ServerOpCodes | |
364 | parse_token(const char *cp, const char *filename, | |
365 | int linenum) | |
366 | { | |
367 | u_int i; | |
368 | ||
369 | for (i = 0; keywords[i].name; i++) | |
370 | if (strcasecmp(cp, keywords[i].name) == 0) | |
371 | return keywords[i].opcode; | |
372 | ||
373 | error("%s: line %d: Bad configuration option: %s", | |
374 | filename, linenum, cp); | |
375 | return sBadOption; | |
376 | } | |
377 | ||
378 | static void | |
379 | add_listen_addr(ServerOptions *options, char *addr, u_short port) | |
380 | { | |
381 | int i; | |
382 | ||
383 | if (options->num_ports == 0) | |
384 | options->ports[options->num_ports++] = SSH_DEFAULT_PORT; | |
385 | if (port == 0) | |
386 | for (i = 0; i < options->num_ports; i++) | |
387 | add_one_listen_addr(options, addr, options->ports[i]); | |
388 | else | |
389 | add_one_listen_addr(options, addr, port); | |
390 | } | |
391 | ||
392 | static void | |
393 | add_one_listen_addr(ServerOptions *options, char *addr, u_short port) | |
394 | { | |
395 | struct addrinfo hints, *ai, *aitop; | |
396 | char strport[NI_MAXSERV]; | |
397 | int gaierr; | |
398 | ||
399 | memset(&hints, 0, sizeof(hints)); | |
400 | hints.ai_family = IPv4or6; | |
401 | hints.ai_socktype = SOCK_STREAM; | |
402 | hints.ai_flags = (addr == NULL) ? AI_PASSIVE : 0; | |
403 | snprintf(strport, sizeof strport, "%d", port); | |
404 | if ((gaierr = getaddrinfo(addr, strport, &hints, &aitop)) != 0) | |
405 | fatal("bad addr or host: %s (%s)", | |
406 | addr ? addr : "<NULL>", | |
407 | gai_strerror(gaierr)); | |
408 | for (ai = aitop; ai->ai_next; ai = ai->ai_next) | |
409 | ; | |
410 | ai->ai_next = options->listen_addrs; | |
411 | options->listen_addrs = aitop; | |
412 | } | |
413 | ||
414 | int | |
415 | process_server_config_line(ServerOptions *options, char *line, | |
416 | const char *filename, int linenum) | |
417 | { | |
418 | char *cp, **charptr, *arg, *p; | |
419 | int *intptr, value; | |
420 | ServerOpCodes opcode; | |
421 | int i, n; | |
422 | ||
423 | cp = line; | |
424 | arg = strdelim(&cp); | |
425 | /* Ignore leading whitespace */ | |
426 | if (*arg == '\0') | |
427 | arg = strdelim(&cp); | |
428 | if (!arg || !*arg || *arg == '#') | |
429 | return 0; | |
430 | intptr = NULL; | |
431 | charptr = NULL; | |
432 | opcode = parse_token(arg, filename, linenum); | |
433 | switch (opcode) { | |
434 | /* Portable-specific options */ | |
435 | case sPAMAuthenticationViaKbdInt: | |
436 | intptr = &options->pam_authentication_via_kbd_int; | |
437 | goto parse_flag; | |
438 | ||
439 | /* Standard Options */ | |
440 | case sBadOption: | |
441 | return -1; | |
442 | case sPort: | |
443 | /* ignore ports from configfile if cmdline specifies ports */ | |
444 | if (options->ports_from_cmdline) | |
445 | return 0; | |
446 | if (options->listen_addrs != NULL) | |
447 | fatal("%s line %d: ports must be specified before " | |
448 | "ListenAddress.", filename, linenum); | |
449 | if (options->num_ports >= MAX_PORTS) | |
450 | fatal("%s line %d: too many ports.", | |
451 | filename, linenum); | |
452 | arg = strdelim(&cp); | |
453 | if (!arg || *arg == '\0') | |
454 | fatal("%s line %d: missing port number.", | |
455 | filename, linenum); | |
456 | options->ports[options->num_ports++] = a2port(arg); | |
457 | if (options->ports[options->num_ports-1] == 0) | |
458 | fatal("%s line %d: Badly formatted port number.", | |
459 | filename, linenum); | |
460 | break; | |
461 | ||
462 | case sServerKeyBits: | |
463 | intptr = &options->server_key_bits; | |
464 | parse_int: | |
465 | arg = strdelim(&cp); | |
466 | if (!arg || *arg == '\0') | |
467 | fatal("%s line %d: missing integer value.", | |
468 | filename, linenum); | |
469 | value = atoi(arg); | |
470 | if (*intptr == -1) | |
471 | *intptr = value; | |
472 | break; | |
473 | ||
474 | case sLoginGraceTime: | |
475 | intptr = &options->login_grace_time; | |
476 | parse_time: | |
477 | arg = strdelim(&cp); | |
478 | if (!arg || *arg == '\0') | |
479 | fatal("%s line %d: missing time value.", | |
480 | filename, linenum); | |
481 | if ((value = convtime(arg)) == -1) | |
482 | fatal("%s line %d: invalid time value.", | |
483 | filename, linenum); | |
484 | if (*intptr == -1) | |
485 | *intptr = value; | |
486 | break; | |
487 | ||
488 | case sKeyRegenerationTime: | |
489 | intptr = &options->key_regeneration_time; | |
490 | goto parse_time; | |
491 | ||
492 | case sListenAddress: | |
493 | arg = strdelim(&cp); | |
494 | if (!arg || *arg == '\0' || strncmp(arg, "[]", 2) == 0) | |
495 | fatal("%s line %d: missing inet addr.", | |
496 | filename, linenum); | |
497 | if (*arg == '[') { | |
498 | if ((p = strchr(arg, ']')) == NULL) | |
499 | fatal("%s line %d: bad ipv6 inet addr usage.", | |
500 | filename, linenum); | |
501 | arg++; | |
502 | memmove(p, p+1, strlen(p+1)+1); | |
503 | } else if (((p = strchr(arg, ':')) == NULL) || | |
504 | (strchr(p+1, ':') != NULL)) { | |
505 | add_listen_addr(options, arg, 0); | |
506 | break; | |
507 | } | |
508 | if (*p == ':') { | |
509 | u_short port; | |
510 | ||
511 | p++; | |
512 | if (*p == '\0') | |
513 | fatal("%s line %d: bad inet addr:port usage.", | |
514 | filename, linenum); | |
515 | else { | |
516 | *(p-1) = '\0'; | |
517 | if ((port = a2port(p)) == 0) | |
518 | fatal("%s line %d: bad port number.", | |
519 | filename, linenum); | |
520 | add_listen_addr(options, arg, port); | |
521 | } | |
522 | } else if (*p == '\0') | |
523 | add_listen_addr(options, arg, 0); | |
524 | else | |
525 | fatal("%s line %d: bad inet addr usage.", | |
526 | filename, linenum); | |
527 | break; | |
528 | ||
529 | case sHostKeyFile: | |
530 | intptr = &options->num_host_key_files; | |
531 | if (*intptr >= MAX_HOSTKEYS) | |
532 | fatal("%s line %d: too many host keys specified (max %d).", | |
533 | filename, linenum, MAX_HOSTKEYS); | |
534 | charptr = &options->host_key_files[*intptr]; | |
535 | parse_filename: | |
536 | arg = strdelim(&cp); | |
537 | if (!arg || *arg == '\0') | |
538 | fatal("%s line %d: missing file name.", | |
539 | filename, linenum); | |
540 | if (*charptr == NULL) { | |
541 | *charptr = tilde_expand_filename(arg, getuid()); | |
542 | /* increase optional counter */ | |
543 | if (intptr != NULL) | |
544 | *intptr = *intptr + 1; | |
545 | } | |
546 | break; | |
547 | ||
548 | case sPidFile: | |
549 | charptr = &options->pid_file; | |
550 | goto parse_filename; | |
551 | ||
552 | case sPermitRootLogin: | |
553 | intptr = &options->permit_root_login; | |
554 | arg = strdelim(&cp); | |
555 | if (!arg || *arg == '\0') | |
556 | fatal("%s line %d: missing yes/" | |
557 | "without-password/forced-commands-only/no " | |
558 | "argument.", filename, linenum); | |
559 | value = 0; /* silence compiler */ | |
560 | if (strcmp(arg, "without-password") == 0) | |
561 | value = PERMIT_NO_PASSWD; | |
562 | else if (strcmp(arg, "forced-commands-only") == 0) | |
563 | value = PERMIT_FORCED_ONLY; | |
564 | else if (strcmp(arg, "yes") == 0) | |
565 | value = PERMIT_YES; | |
566 | else if (strcmp(arg, "no") == 0) | |
567 | value = PERMIT_NO; | |
568 | else | |
569 | fatal("%s line %d: Bad yes/" | |
570 | "without-password/forced-commands-only/no " | |
571 | "argument: %s", filename, linenum, arg); | |
572 | if (*intptr == -1) | |
573 | *intptr = value; | |
574 | break; | |
575 | ||
576 | case sIgnoreRhosts: | |
577 | intptr = &options->ignore_rhosts; | |
578 | parse_flag: | |
579 | arg = strdelim(&cp); | |
580 | if (!arg || *arg == '\0') | |
581 | fatal("%s line %d: missing yes/no argument.", | |
582 | filename, linenum); | |
583 | value = 0; /* silence compiler */ | |
584 | if (strcmp(arg, "yes") == 0) | |
585 | value = 1; | |
586 | else if (strcmp(arg, "no") == 0) | |
587 | value = 0; | |
588 | else | |
589 | fatal("%s line %d: Bad yes/no argument: %s", | |
590 | filename, linenum, arg); | |
591 | if (*intptr == -1) | |
592 | *intptr = value; | |
593 | break; | |
594 | ||
595 | case sIgnoreUserKnownHosts: | |
596 | intptr = &options->ignore_user_known_hosts; | |
597 | goto parse_flag; | |
598 | ||
599 | case sRhostsAuthentication: | |
600 | intptr = &options->rhosts_authentication; | |
601 | goto parse_flag; | |
602 | ||
603 | case sRhostsRSAAuthentication: | |
604 | intptr = &options->rhosts_rsa_authentication; | |
605 | goto parse_flag; | |
606 | ||
607 | case sHostbasedAuthentication: | |
608 | intptr = &options->hostbased_authentication; | |
609 | goto parse_flag; | |
610 | ||
611 | case sHostbasedUsesNameFromPacketOnly: | |
612 | intptr = &options->hostbased_uses_name_from_packet_only; | |
613 | goto parse_flag; | |
614 | ||
615 | case sRSAAuthentication: | |
616 | intptr = &options->rsa_authentication; | |
617 | goto parse_flag; | |
618 | ||
619 | case sPubkeyAuthentication: | |
620 | intptr = &options->pubkey_authentication; | |
621 | goto parse_flag; | |
622 | #if defined(KRB4) || defined(KRB5) | |
623 | case sKerberosAuthentication: | |
624 | intptr = &options->kerberos_authentication; | |
625 | goto parse_flag; | |
626 | ||
627 | case sKerberosOrLocalPasswd: | |
628 | intptr = &options->kerberos_or_local_passwd; | |
629 | goto parse_flag; | |
630 | ||
631 | case sKerberosTicketCleanup: | |
632 | intptr = &options->kerberos_ticket_cleanup; | |
633 | goto parse_flag; | |
634 | #endif | |
635 | #if defined(AFS) || defined(KRB5) | |
636 | case sKerberosTgtPassing: | |
637 | intptr = &options->kerberos_tgt_passing; | |
638 | goto parse_flag; | |
639 | #endif | |
640 | #ifdef AFS | |
641 | case sAFSTokenPassing: | |
642 | intptr = &options->afs_token_passing; | |
643 | goto parse_flag; | |
644 | #endif | |
645 | ||
646 | case sPasswordAuthentication: | |
647 | intptr = &options->password_authentication; | |
648 | goto parse_flag; | |
649 | ||
650 | case sKbdInteractiveAuthentication: | |
651 | intptr = &options->kbd_interactive_authentication; | |
652 | goto parse_flag; | |
653 | ||
654 | case sChallengeResponseAuthentication: | |
655 | intptr = &options->challenge_response_authentication; | |
656 | goto parse_flag; | |
657 | ||
658 | case sPrintMotd: | |
659 | intptr = &options->print_motd; | |
660 | goto parse_flag; | |
661 | ||
662 | case sPrintLastLog: | |
663 | intptr = &options->print_lastlog; | |
664 | goto parse_flag; | |
665 | ||
666 | case sX11Forwarding: | |
667 | intptr = &options->x11_forwarding; | |
668 | goto parse_flag; | |
669 | ||
670 | case sX11DisplayOffset: | |
671 | intptr = &options->x11_display_offset; | |
672 | goto parse_int; | |
673 | ||
674 | case sX11UseLocalhost: | |
675 | intptr = &options->x11_use_localhost; | |
676 | goto parse_flag; | |
677 | ||
678 | case sXAuthLocation: | |
679 | charptr = &options->xauth_location; | |
680 | goto parse_filename; | |
681 | ||
682 | case sStrictModes: | |
683 | intptr = &options->strict_modes; | |
684 | goto parse_flag; | |
685 | ||
686 | case sKeepAlives: | |
687 | intptr = &options->keepalives; | |
688 | goto parse_flag; | |
689 | ||
690 | case sEmptyPasswd: | |
691 | intptr = &options->permit_empty_passwd; | |
692 | goto parse_flag; | |
693 | ||
694 | case sUseLogin: | |
695 | intptr = &options->use_login; | |
696 | goto parse_flag; | |
697 | ||
698 | case sGatewayPorts: | |
699 | intptr = &options->gateway_ports; | |
700 | goto parse_flag; | |
701 | ||
702 | case sVerifyReverseMapping: | |
703 | intptr = &options->verify_reverse_mapping; | |
704 | goto parse_flag; | |
705 | ||
706 | case sLogFacility: | |
707 | intptr = (int *) &options->log_facility; | |
708 | arg = strdelim(&cp); | |
709 | value = log_facility_number(arg); | |
710 | if (value == SYSLOG_FACILITY_NOT_SET) | |
711 | fatal("%.200s line %d: unsupported log facility '%s'", | |
712 | filename, linenum, arg ? arg : "<NONE>"); | |
713 | if (*intptr == -1) | |
714 | *intptr = (SyslogFacility) value; | |
715 | break; | |
716 | ||
717 | case sLogLevel: | |
718 | intptr = (int *) &options->log_level; | |
719 | arg = strdelim(&cp); | |
720 | value = log_level_number(arg); | |
721 | if (value == SYSLOG_LEVEL_NOT_SET) | |
722 | fatal("%.200s line %d: unsupported log level '%s'", | |
723 | filename, linenum, arg ? arg : "<NONE>"); | |
724 | if (*intptr == -1) | |
725 | *intptr = (LogLevel) value; | |
726 | break; | |
727 | ||
728 | case sAllowTcpForwarding: | |
729 | intptr = &options->allow_tcp_forwarding; | |
730 | goto parse_flag; | |
731 | ||
732 | case sUsePrivilegeSeparation: | |
733 | intptr = &use_privsep; | |
734 | goto parse_flag; | |
735 | ||
736 | case sAllowUsers: | |
737 | while ((arg = strdelim(&cp)) && *arg != '\0') { | |
738 | if (options->num_allow_users >= MAX_ALLOW_USERS) | |
739 | fatal("%s line %d: too many allow users.", | |
740 | filename, linenum); | |
741 | options->allow_users[options->num_allow_users++] = xstrdup(arg); | |
742 | } | |
743 | break; | |
744 | ||
745 | case sDenyUsers: | |
746 | while ((arg = strdelim(&cp)) && *arg != '\0') { | |
747 | if (options->num_deny_users >= MAX_DENY_USERS) | |
748 | fatal( "%s line %d: too many deny users.", | |
749 | filename, linenum); | |
750 | options->deny_users[options->num_deny_users++] = xstrdup(arg); | |
751 | } | |
752 | break; | |
753 | ||
754 | case sAllowGroups: | |
755 | while ((arg = strdelim(&cp)) && *arg != '\0') { | |
756 | if (options->num_allow_groups >= MAX_ALLOW_GROUPS) | |
757 | fatal("%s line %d: too many allow groups.", | |
758 | filename, linenum); | |
759 | options->allow_groups[options->num_allow_groups++] = xstrdup(arg); | |
760 | } | |
761 | break; | |
762 | ||
763 | case sDenyGroups: | |
764 | while ((arg = strdelim(&cp)) && *arg != '\0') { | |
765 | if (options->num_deny_groups >= MAX_DENY_GROUPS) | |
766 | fatal("%s line %d: too many deny groups.", | |
767 | filename, linenum); | |
768 | options->deny_groups[options->num_deny_groups++] = xstrdup(arg); | |
769 | } | |
770 | break; | |
771 | ||
772 | case sCiphers: | |
773 | arg = strdelim(&cp); | |
774 | if (!arg || *arg == '\0') | |
775 | fatal("%s line %d: Missing argument.", filename, linenum); | |
776 | if (!ciphers_valid(arg)) | |
777 | fatal("%s line %d: Bad SSH2 cipher spec '%s'.", | |
778 | filename, linenum, arg ? arg : "<NONE>"); | |
779 | if (options->ciphers == NULL) | |
780 | options->ciphers = xstrdup(arg); | |
781 | break; | |
782 | ||
783 | case sMacs: | |
784 | arg = strdelim(&cp); | |
785 | if (!arg || *arg == '\0') | |
786 | fatal("%s line %d: Missing argument.", filename, linenum); | |
787 | if (!mac_valid(arg)) | |
788 | fatal("%s line %d: Bad SSH2 mac spec '%s'.", | |
789 | filename, linenum, arg ? arg : "<NONE>"); | |
790 | if (options->macs == NULL) | |
791 | options->macs = xstrdup(arg); | |
792 | break; | |
793 | ||
794 | case sProtocol: | |
795 | intptr = &options->protocol; | |
796 | arg = strdelim(&cp); | |
797 | if (!arg || *arg == '\0') | |
798 | fatal("%s line %d: Missing argument.", filename, linenum); | |
799 | value = proto_spec(arg); | |
800 | if (value == SSH_PROTO_UNKNOWN) | |
801 | fatal("%s line %d: Bad protocol spec '%s'.", | |
802 | filename, linenum, arg ? arg : "<NONE>"); | |
803 | if (*intptr == SSH_PROTO_UNKNOWN) | |
804 | *intptr = value; | |
805 | break; | |
806 | ||
807 | case sSubsystem: | |
808 | if (options->num_subsystems >= MAX_SUBSYSTEMS) { | |
809 | fatal("%s line %d: too many subsystems defined.", | |
810 | filename, linenum); | |
811 | } | |
812 | arg = strdelim(&cp); | |
813 | if (!arg || *arg == '\0') | |
814 | fatal("%s line %d: Missing subsystem name.", | |
815 | filename, linenum); | |
816 | for (i = 0; i < options->num_subsystems; i++) | |
817 | if (strcmp(arg, options->subsystem_name[i]) == 0) | |
818 | fatal("%s line %d: Subsystem '%s' already defined.", | |
819 | filename, linenum, arg); | |
820 | options->subsystem_name[options->num_subsystems] = xstrdup(arg); | |
821 | arg = strdelim(&cp); | |
822 | if (!arg || *arg == '\0') | |
823 | fatal("%s line %d: Missing subsystem command.", | |
824 | filename, linenum); | |
825 | options->subsystem_command[options->num_subsystems] = xstrdup(arg); | |
826 | options->num_subsystems++; | |
827 | break; | |
828 | ||
829 | case sMaxStartups: | |
830 | arg = strdelim(&cp); | |
831 | if (!arg || *arg == '\0') | |
832 | fatal("%s line %d: Missing MaxStartups spec.", | |
833 | filename, linenum); | |
834 | if ((n = sscanf(arg, "%d:%d:%d", | |
835 | &options->max_startups_begin, | |
836 | &options->max_startups_rate, | |
837 | &options->max_startups)) == 3) { | |
838 | if (options->max_startups_begin > | |
839 | options->max_startups || | |
840 | options->max_startups_rate > 100 || | |
841 | options->max_startups_rate < 1) | |
842 | fatal("%s line %d: Illegal MaxStartups spec.", | |
843 | filename, linenum); | |
844 | } else if (n != 1) | |
845 | fatal("%s line %d: Illegal MaxStartups spec.", | |
846 | filename, linenum); | |
847 | else | |
848 | options->max_startups = options->max_startups_begin; | |
849 | break; | |
850 | ||
851 | case sBanner: | |
852 | charptr = &options->banner; | |
853 | goto parse_filename; | |
854 | /* | |
855 | * These options can contain %X options expanded at | |
856 | * connect time, so that you can specify paths like: | |
857 | * | |
858 | * AuthorizedKeysFile /etc/ssh_keys/%u | |
859 | */ | |
860 | case sAuthorizedKeysFile: | |
861 | case sAuthorizedKeysFile2: | |
862 | charptr = (opcode == sAuthorizedKeysFile ) ? | |
863 | &options->authorized_keys_file : | |
864 | &options->authorized_keys_file2; | |
865 | goto parse_filename; | |
866 | ||
867 | case sClientAliveInterval: | |
868 | intptr = &options->client_alive_interval; | |
869 | goto parse_time; | |
870 | ||
871 | case sClientAliveCountMax: | |
872 | intptr = &options->client_alive_count_max; | |
873 | goto parse_int; | |
874 | ||
875 | case sDeprecated: | |
876 | log("%s line %d: Deprecated option %s", | |
877 | filename, linenum, arg); | |
878 | while (arg) | |
879 | arg = strdelim(&cp); | |
880 | break; | |
881 | ||
882 | default: | |
883 | fatal("%s line %d: Missing handler for opcode %s (%d)", | |
884 | filename, linenum, arg, opcode); | |
885 | } | |
886 | if ((arg = strdelim(&cp)) != NULL && *arg != '\0') | |
887 | fatal("%s line %d: garbage at end of line; \"%.200s\".", | |
888 | filename, linenum, arg); | |
889 | return 0; | |
890 | } | |
891 | ||
892 | /* Reads the server configuration file. */ | |
893 | ||
894 | void | |
895 | read_server_config(ServerOptions *options, const char *filename) | |
896 | { | |
897 | FILE *f; | |
898 | char line[1024]; | |
899 | int linenum; | |
900 | int bad_options = 0; | |
901 | ||
902 | f = fopen(filename, "r"); | |
903 | if (!f) { | |
904 | perror(filename); | |
905 | exit(1); | |
906 | } | |
907 | linenum = 0; | |
908 | while (fgets(line, sizeof(line), f)) { | |
909 | /* Update line number counter. */ | |
910 | linenum++; | |
911 | if (process_server_config_line(options, line, filename, linenum) != 0) | |
912 | bad_options++; | |
913 | } | |
914 | fclose(f); | |
915 | if (bad_options > 0) | |
916 | fatal("%s: terminating, %d bad configuration options", | |
917 | filename, bad_options); | |
918 | } |