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3c0ef626 | 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" | |
e9702f7d | 13 | RCSID("$OpenBSD: servconf.c,v 1.101 2002/02/04 12:15:25 markus Exp $"); |
3c0ef626 | 14 | |
63119dd9 | 15 | #if defined(KRB4) |
3c0ef626 | 16 | #include <krb.h> |
17 | #endif | |
63119dd9 | 18 | #if defined(KRB5) |
19 | #ifdef HEIMDAL | |
20 | #include <krb.h> | |
21 | #else | |
22 | /* Bodge - but then, so is using the kerberos IV KEYFILE to get a Kerberos V | |
23 | * keytab */ | |
24 | #define KEYFILE "/etc/krb5.keytab" | |
25 | #endif | |
26 | #endif | |
3c0ef626 | 27 | #ifdef AFS |
28 | #include <kafs.h> | |
29 | #endif | |
30 | ||
31 | #include "ssh.h" | |
32 | #include "log.h" | |
33 | #include "servconf.h" | |
34 | #include "xmalloc.h" | |
35 | #include "compat.h" | |
36 | #include "pathnames.h" | |
37 | #include "tildexpand.h" | |
38 | #include "misc.h" | |
39 | #include "cipher.h" | |
40 | #include "kex.h" | |
41 | #include "mac.h" | |
42 | ||
43 | static void add_listen_addr(ServerOptions *, char *, u_short); | |
44 | static void add_one_listen_addr(ServerOptions *, char *, u_short); | |
45 | ||
46 | /* AF_UNSPEC or AF_INET or AF_INET6 */ | |
47 | extern int IPv4or6; | |
48 | ||
49 | /* Initializes the server options to their default values. */ | |
50 | ||
51 | void | |
52 | initialize_server_options(ServerOptions *options) | |
53 | { | |
54 | memset(options, 0, sizeof(*options)); | |
55 | ||
56 | /* Portable-specific options */ | |
57 | options->pam_authentication_via_kbd_int = -1; | |
58 | ||
59 | /* Standard Options */ | |
60 | options->num_ports = 0; | |
61 | options->ports_from_cmdline = 0; | |
62 | options->listen_addrs = NULL; | |
63 | options->num_host_key_files = 0; | |
64 | options->pid_file = NULL; | |
65 | options->server_key_bits = -1; | |
66 | options->login_grace_time = -1; | |
67 | options->key_regeneration_time = -1; | |
68 | options->permit_root_login = PERMIT_NOT_SET; | |
69 | options->ignore_rhosts = -1; | |
70 | options->ignore_user_known_hosts = -1; | |
71 | options->print_motd = -1; | |
72 | options->print_lastlog = -1; | |
73 | options->x11_forwarding = -1; | |
74 | options->x11_display_offset = -1; | |
e9702f7d | 75 | options->x11_use_localhost = -1; |
3c0ef626 | 76 | options->xauth_location = NULL; |
77 | options->strict_modes = -1; | |
78 | options->keepalives = -1; | |
e9702f7d | 79 | options->log_facility = SYSLOG_FACILITY_NOT_SET; |
80 | options->log_level = SYSLOG_LEVEL_NOT_SET; | |
3c0ef626 | 81 | options->rhosts_authentication = -1; |
82 | options->rhosts_rsa_authentication = -1; | |
83 | options->hostbased_authentication = -1; | |
84 | options->hostbased_uses_name_from_packet_only = -1; | |
85 | options->rsa_authentication = -1; | |
86 | options->pubkey_authentication = -1; | |
5598e598 | 87 | #ifdef GSSAPI |
88 | options->gss_authentication=-1; | |
89 | options->gss_keyex=-1; | |
90 | options->gss_use_session_ccache = -1; | |
91 | options->gss_cleanup_creds = -1; | |
92 | #endif | |
3c0ef626 | 93 | #if defined(KRB4) || defined(KRB5) |
94 | options->kerberos_authentication = -1; | |
95 | options->kerberos_or_local_passwd = -1; | |
96 | options->kerberos_ticket_cleanup = -1; | |
97 | #endif | |
98 | #if defined(AFS) || defined(KRB5) | |
99 | options->kerberos_tgt_passing = -1; | |
100 | #endif | |
101 | #ifdef AFS | |
102 | options->afs_token_passing = -1; | |
103 | #endif | |
104 | options->password_authentication = -1; | |
105 | options->kbd_interactive_authentication = -1; | |
106 | options->challenge_response_authentication = -1; | |
107 | options->permit_empty_passwd = -1; | |
108 | options->use_login = -1; | |
109 | options->allow_tcp_forwarding = -1; | |
110 | options->num_allow_users = 0; | |
111 | options->num_deny_users = 0; | |
112 | options->num_allow_groups = 0; | |
113 | options->num_deny_groups = 0; | |
114 | options->ciphers = NULL; | |
115 | options->macs = NULL; | |
116 | options->protocol = SSH_PROTO_UNKNOWN; | |
117 | options->gateway_ports = -1; | |
118 | options->num_subsystems = 0; | |
119 | options->max_startups_begin = -1; | |
120 | options->max_startups_rate = -1; | |
121 | options->max_startups = -1; | |
122 | options->banner = NULL; | |
e9702f7d | 123 | options->verify_reverse_mapping = -1; |
3c0ef626 | 124 | options->client_alive_interval = -1; |
125 | options->client_alive_count_max = -1; | |
126 | options->authorized_keys_file = NULL; | |
127 | options->authorized_keys_file2 = NULL; | |
128 | } | |
129 | ||
130 | void | |
131 | fill_default_server_options(ServerOptions *options) | |
132 | { | |
133 | /* Portable-specific options */ | |
134 | if (options->pam_authentication_via_kbd_int == -1) | |
135 | options->pam_authentication_via_kbd_int = 0; | |
136 | ||
137 | /* Standard Options */ | |
138 | if (options->protocol == SSH_PROTO_UNKNOWN) | |
139 | options->protocol = SSH_PROTO_1|SSH_PROTO_2; | |
140 | if (options->num_host_key_files == 0) { | |
141 | /* fill default hostkeys for protocols */ | |
142 | if (options->protocol & SSH_PROTO_1) | |
e9702f7d | 143 | options->host_key_files[options->num_host_key_files++] = |
144 | _PATH_HOST_KEY_FILE; | |
145 | if (options->protocol & SSH_PROTO_2) { | |
146 | options->host_key_files[options->num_host_key_files++] = | |
147 | _PATH_HOST_RSA_KEY_FILE; | |
148 | options->host_key_files[options->num_host_key_files++] = | |
149 | _PATH_HOST_DSA_KEY_FILE; | |
150 | } | |
3c0ef626 | 151 | } |
152 | if (options->num_ports == 0) | |
153 | options->ports[options->num_ports++] = SSH_DEFAULT_PORT; | |
154 | if (options->listen_addrs == NULL) | |
155 | add_listen_addr(options, NULL, 0); | |
156 | if (options->pid_file == NULL) | |
157 | options->pid_file = _PATH_SSH_DAEMON_PID_FILE; | |
158 | if (options->server_key_bits == -1) | |
159 | options->server_key_bits = 768; | |
160 | if (options->login_grace_time == -1) | |
161 | options->login_grace_time = 600; | |
162 | if (options->key_regeneration_time == -1) | |
163 | options->key_regeneration_time = 3600; | |
164 | if (options->permit_root_login == PERMIT_NOT_SET) | |
165 | options->permit_root_login = PERMIT_YES; | |
166 | if (options->ignore_rhosts == -1) | |
167 | options->ignore_rhosts = 1; | |
168 | if (options->ignore_user_known_hosts == -1) | |
169 | options->ignore_user_known_hosts = 0; | |
170 | if (options->print_motd == -1) | |
171 | options->print_motd = 1; | |
172 | if (options->print_lastlog == -1) | |
173 | options->print_lastlog = 1; | |
174 | if (options->x11_forwarding == -1) | |
175 | options->x11_forwarding = 0; | |
176 | if (options->x11_display_offset == -1) | |
177 | options->x11_display_offset = 10; | |
e9702f7d | 178 | if (options->x11_use_localhost == -1) |
179 | options->x11_use_localhost = 1; | |
3c0ef626 | 180 | if (options->xauth_location == NULL) |
181 | options->xauth_location = _PATH_XAUTH; | |
3c0ef626 | 182 | if (options->strict_modes == -1) |
183 | options->strict_modes = 1; | |
184 | if (options->keepalives == -1) | |
185 | options->keepalives = 1; | |
e9702f7d | 186 | if (options->log_facility == SYSLOG_FACILITY_NOT_SET) |
3c0ef626 | 187 | options->log_facility = SYSLOG_FACILITY_AUTH; |
e9702f7d | 188 | if (options->log_level == SYSLOG_LEVEL_NOT_SET) |
3c0ef626 | 189 | options->log_level = SYSLOG_LEVEL_INFO; |
190 | if (options->rhosts_authentication == -1) | |
191 | options->rhosts_authentication = 0; | |
192 | if (options->rhosts_rsa_authentication == -1) | |
193 | options->rhosts_rsa_authentication = 0; | |
194 | if (options->hostbased_authentication == -1) | |
195 | options->hostbased_authentication = 0; | |
196 | if (options->hostbased_uses_name_from_packet_only == -1) | |
197 | options->hostbased_uses_name_from_packet_only = 0; | |
198 | if (options->rsa_authentication == -1) | |
199 | options->rsa_authentication = 1; | |
200 | if (options->pubkey_authentication == -1) | |
201 | options->pubkey_authentication = 1; | |
5598e598 | 202 | #ifdef GSSAPI |
203 | if (options->gss_authentication == -1) | |
204 | options->gss_authentication = 1; | |
205 | if (options->gss_keyex == -1) | |
206 | options->gss_keyex =1; | |
207 | if (options->gss_use_session_ccache == -1) | |
208 | options->gss_use_session_ccache = 1; | |
209 | if (options->gss_cleanup_creds == -1) | |
210 | options->gss_cleanup_creds = 1; | |
211 | #endif | |
3c0ef626 | 212 | #if defined(KRB4) || defined(KRB5) |
213 | if (options->kerberos_authentication == -1) | |
214 | options->kerberos_authentication = (access(KEYFILE, R_OK) == 0); | |
215 | if (options->kerberos_or_local_passwd == -1) | |
216 | options->kerberos_or_local_passwd = 1; | |
217 | if (options->kerberos_ticket_cleanup == -1) | |
218 | options->kerberos_ticket_cleanup = 1; | |
219 | #endif | |
220 | #if defined(AFS) || defined(KRB5) | |
221 | if (options->kerberos_tgt_passing == -1) | |
222 | options->kerberos_tgt_passing = 0; | |
223 | #endif | |
e9702f7d | 224 | #ifdef AFS |
3c0ef626 | 225 | if (options->afs_token_passing == -1) |
226 | options->afs_token_passing = k_hasafs(); | |
227 | #endif | |
228 | if (options->password_authentication == -1) | |
229 | options->password_authentication = 1; | |
230 | if (options->kbd_interactive_authentication == -1) | |
231 | options->kbd_interactive_authentication = 0; | |
232 | if (options->challenge_response_authentication == -1) | |
233 | options->challenge_response_authentication = 1; | |
234 | if (options->permit_empty_passwd == -1) | |
235 | options->permit_empty_passwd = 0; | |
236 | if (options->use_login == -1) | |
237 | options->use_login = 0; | |
238 | if (options->allow_tcp_forwarding == -1) | |
239 | options->allow_tcp_forwarding = 1; | |
240 | if (options->gateway_ports == -1) | |
241 | options->gateway_ports = 0; | |
242 | if (options->max_startups == -1) | |
243 | options->max_startups = 10; | |
244 | if (options->max_startups_rate == -1) | |
245 | options->max_startups_rate = 100; /* 100% */ | |
246 | if (options->max_startups_begin == -1) | |
247 | options->max_startups_begin = options->max_startups; | |
e9702f7d | 248 | if (options->verify_reverse_mapping == -1) |
249 | options->verify_reverse_mapping = 0; | |
3c0ef626 | 250 | if (options->client_alive_interval == -1) |
e9702f7d | 251 | options->client_alive_interval = 0; |
3c0ef626 | 252 | if (options->client_alive_count_max == -1) |
253 | options->client_alive_count_max = 3; | |
254 | if (options->authorized_keys_file2 == NULL) { | |
255 | /* authorized_keys_file2 falls back to authorized_keys_file */ | |
256 | if (options->authorized_keys_file != NULL) | |
257 | options->authorized_keys_file2 = options->authorized_keys_file; | |
258 | else | |
259 | options->authorized_keys_file2 = _PATH_SSH_USER_PERMITTED_KEYS2; | |
260 | } | |
261 | if (options->authorized_keys_file == NULL) | |
262 | options->authorized_keys_file = _PATH_SSH_USER_PERMITTED_KEYS; | |
263 | } | |
264 | ||
265 | /* Keyword tokens. */ | |
266 | typedef enum { | |
267 | sBadOption, /* == unknown option */ | |
268 | /* Portable-specific options */ | |
269 | sPAMAuthenticationViaKbdInt, | |
270 | /* Standard Options */ | |
271 | sPort, sHostKeyFile, sServerKeyBits, sLoginGraceTime, sKeyRegenerationTime, | |
272 | sPermitRootLogin, sLogFacility, sLogLevel, | |
273 | sRhostsAuthentication, sRhostsRSAAuthentication, sRSAAuthentication, | |
5598e598 | 274 | #ifdef GSSAPI |
275 | sGssAuthentication, sGssKeyEx, sGssUseSessionCredCache, sGssCleanupCreds, | |
276 | #endif | |
3c0ef626 | 277 | #if defined(KRB4) || defined(KRB5) |
278 | sKerberosAuthentication, sKerberosOrLocalPasswd, sKerberosTicketCleanup, | |
279 | #endif | |
280 | #if defined(AFS) || defined(KRB5) | |
281 | sKerberosTgtPassing, | |
282 | #endif | |
283 | #ifdef AFS | |
284 | sAFSTokenPassing, | |
285 | #endif | |
286 | sChallengeResponseAuthentication, | |
287 | sPasswordAuthentication, sKbdInteractiveAuthentication, sListenAddress, | |
288 | sPrintMotd, sPrintLastLog, sIgnoreRhosts, | |
e9702f7d | 289 | sX11Forwarding, sX11DisplayOffset, sX11UseLocalhost, |
3c0ef626 | 290 | sStrictModes, sEmptyPasswd, sKeepAlives, |
291 | sUseLogin, sAllowTcpForwarding, | |
292 | sAllowUsers, sDenyUsers, sAllowGroups, sDenyGroups, | |
293 | sIgnoreUserKnownHosts, sCiphers, sMacs, sProtocol, sPidFile, | |
294 | sGatewayPorts, sPubkeyAuthentication, sXAuthLocation, sSubsystem, sMaxStartups, | |
e9702f7d | 295 | sBanner, sVerifyReverseMapping, sHostbasedAuthentication, |
296 | sHostbasedUsesNameFromPacketOnly, sClientAliveInterval, | |
3c0ef626 | 297 | sClientAliveCountMax, sAuthorizedKeysFile, sAuthorizedKeysFile2, |
e9702f7d | 298 | sDeprecated |
3c0ef626 | 299 | } ServerOpCodes; |
300 | ||
301 | /* Textual representation of the tokens. */ | |
302 | static struct { | |
303 | const char *name; | |
304 | ServerOpCodes opcode; | |
305 | } keywords[] = { | |
306 | /* Portable-specific options */ | |
307 | { "PAMAuthenticationViaKbdInt", sPAMAuthenticationViaKbdInt }, | |
308 | /* Standard Options */ | |
309 | { "port", sPort }, | |
310 | { "hostkey", sHostKeyFile }, | |
311 | { "hostdsakey", sHostKeyFile }, /* alias */ | |
312 | { "pidfile", sPidFile }, | |
313 | { "serverkeybits", sServerKeyBits }, | |
314 | { "logingracetime", sLoginGraceTime }, | |
315 | { "keyregenerationinterval", sKeyRegenerationTime }, | |
316 | { "permitrootlogin", sPermitRootLogin }, | |
317 | { "syslogfacility", sLogFacility }, | |
318 | { "loglevel", sLogLevel }, | |
319 | { "rhostsauthentication", sRhostsAuthentication }, | |
320 | { "rhostsrsaauthentication", sRhostsRSAAuthentication }, | |
321 | { "hostbasedauthentication", sHostbasedAuthentication }, | |
322 | { "hostbasedusesnamefrompacketonly", sHostbasedUsesNameFromPacketOnly }, | |
323 | { "rsaauthentication", sRSAAuthentication }, | |
324 | { "pubkeyauthentication", sPubkeyAuthentication }, | |
325 | { "dsaauthentication", sPubkeyAuthentication }, /* alias */ | |
5598e598 | 326 | #ifdef GSSAPI |
327 | { "gssapiauthentication", sGssAuthentication }, | |
328 | { "gssapikeyexchange", sGssKeyEx }, | |
329 | { "gssusesessionccache", sGssUseSessionCredCache }, | |
330 | { "gssapiusesessioncredcache", sGssUseSessionCredCache }, | |
331 | { "gssapicleanupcreds", sGssCleanupCreds }, | |
332 | #endif | |
3c0ef626 | 333 | #if defined(KRB4) || defined(KRB5) |
334 | { "kerberosauthentication", sKerberosAuthentication }, | |
335 | { "kerberosorlocalpasswd", sKerberosOrLocalPasswd }, | |
336 | { "kerberosticketcleanup", sKerberosTicketCleanup }, | |
337 | #endif | |
338 | #if defined(AFS) || defined(KRB5) | |
339 | { "kerberostgtpassing", sKerberosTgtPassing }, | |
340 | #endif | |
341 | #ifdef AFS | |
342 | { "afstokenpassing", sAFSTokenPassing }, | |
343 | #endif | |
344 | { "passwordauthentication", sPasswordAuthentication }, | |
345 | { "kbdinteractiveauthentication", sKbdInteractiveAuthentication }, | |
346 | { "challengeresponseauthentication", sChallengeResponseAuthentication }, | |
347 | { "skeyauthentication", sChallengeResponseAuthentication }, /* alias */ | |
348 | { "checkmail", sDeprecated }, | |
349 | { "listenaddress", sListenAddress }, | |
350 | { "printmotd", sPrintMotd }, | |
351 | { "printlastlog", sPrintLastLog }, | |
352 | { "ignorerhosts", sIgnoreRhosts }, | |
353 | { "ignoreuserknownhosts", sIgnoreUserKnownHosts }, | |
354 | { "x11forwarding", sX11Forwarding }, | |
355 | { "x11displayoffset", sX11DisplayOffset }, | |
e9702f7d | 356 | { "x11uselocalhost", sX11UseLocalhost }, |
3c0ef626 | 357 | { "xauthlocation", sXAuthLocation }, |
358 | { "strictmodes", sStrictModes }, | |
359 | { "permitemptypasswords", sEmptyPasswd }, | |
360 | { "uselogin", sUseLogin }, | |
361 | { "keepalive", sKeepAlives }, | |
362 | { "allowtcpforwarding", sAllowTcpForwarding }, | |
363 | { "allowusers", sAllowUsers }, | |
364 | { "denyusers", sDenyUsers }, | |
365 | { "allowgroups", sAllowGroups }, | |
366 | { "denygroups", sDenyGroups }, | |
367 | { "ciphers", sCiphers }, | |
368 | { "macs", sMacs }, | |
369 | { "protocol", sProtocol }, | |
370 | { "gatewayports", sGatewayPorts }, | |
371 | { "subsystem", sSubsystem }, | |
372 | { "maxstartups", sMaxStartups }, | |
373 | { "banner", sBanner }, | |
e9702f7d | 374 | { "verifyreversemapping", sVerifyReverseMapping }, |
375 | { "reversemappingcheck", sVerifyReverseMapping }, | |
3c0ef626 | 376 | { "clientaliveinterval", sClientAliveInterval }, |
377 | { "clientalivecountmax", sClientAliveCountMax }, | |
378 | { "authorizedkeysfile", sAuthorizedKeysFile }, | |
379 | { "authorizedkeysfile2", sAuthorizedKeysFile2 }, | |
e9702f7d | 380 | { NULL, sBadOption } |
3c0ef626 | 381 | }; |
382 | ||
383 | /* | |
384 | * Returns the number of the token pointed to by cp or sBadOption. | |
385 | */ | |
386 | ||
387 | static ServerOpCodes | |
388 | parse_token(const char *cp, const char *filename, | |
389 | int linenum) | |
390 | { | |
391 | u_int i; | |
392 | ||
393 | for (i = 0; keywords[i].name; i++) | |
394 | if (strcasecmp(cp, keywords[i].name) == 0) | |
395 | return keywords[i].opcode; | |
396 | ||
397 | error("%s: line %d: Bad configuration option: %s", | |
398 | filename, linenum, cp); | |
399 | return sBadOption; | |
400 | } | |
401 | ||
402 | static void | |
403 | add_listen_addr(ServerOptions *options, char *addr, u_short port) | |
404 | { | |
405 | int i; | |
406 | ||
407 | if (options->num_ports == 0) | |
408 | options->ports[options->num_ports++] = SSH_DEFAULT_PORT; | |
409 | if (port == 0) | |
410 | for (i = 0; i < options->num_ports; i++) | |
411 | add_one_listen_addr(options, addr, options->ports[i]); | |
412 | else | |
413 | add_one_listen_addr(options, addr, port); | |
414 | } | |
415 | ||
416 | static void | |
417 | add_one_listen_addr(ServerOptions *options, char *addr, u_short port) | |
418 | { | |
419 | struct addrinfo hints, *ai, *aitop; | |
420 | char strport[NI_MAXSERV]; | |
421 | int gaierr; | |
422 | ||
423 | memset(&hints, 0, sizeof(hints)); | |
424 | hints.ai_family = IPv4or6; | |
425 | hints.ai_socktype = SOCK_STREAM; | |
426 | hints.ai_flags = (addr == NULL) ? AI_PASSIVE : 0; | |
427 | snprintf(strport, sizeof strport, "%d", port); | |
428 | if ((gaierr = getaddrinfo(addr, strport, &hints, &aitop)) != 0) | |
429 | fatal("bad addr or host: %s (%s)", | |
430 | addr ? addr : "<NULL>", | |
431 | gai_strerror(gaierr)); | |
432 | for (ai = aitop; ai->ai_next; ai = ai->ai_next) | |
433 | ; | |
434 | ai->ai_next = options->listen_addrs; | |
435 | options->listen_addrs = aitop; | |
436 | } | |
437 | ||
e9702f7d | 438 | int |
439 | process_server_config_line(ServerOptions *options, char *line, | |
440 | const char *filename, int linenum) | |
3c0ef626 | 441 | { |
3c0ef626 | 442 | char *cp, **charptr, *arg, *p; |
e9702f7d | 443 | int *intptr, value; |
3c0ef626 | 444 | ServerOpCodes opcode; |
445 | int i, n; | |
446 | ||
e9702f7d | 447 | cp = line; |
448 | arg = strdelim(&cp); | |
449 | /* Ignore leading whitespace */ | |
450 | if (*arg == '\0') | |
3c0ef626 | 451 | arg = strdelim(&cp); |
e9702f7d | 452 | if (!arg || !*arg || *arg == '#') |
453 | return 0; | |
454 | intptr = NULL; | |
455 | charptr = NULL; | |
456 | opcode = parse_token(arg, filename, linenum); | |
457 | switch (opcode) { | |
458 | /* Portable-specific options */ | |
459 | case sPAMAuthenticationViaKbdInt: | |
460 | intptr = &options->pam_authentication_via_kbd_int; | |
461 | goto parse_flag; | |
3c0ef626 | 462 | |
e9702f7d | 463 | /* Standard Options */ |
464 | case sBadOption: | |
465 | return -1; | |
466 | case sPort: | |
467 | /* ignore ports from configfile if cmdline specifies ports */ | |
468 | if (options->ports_from_cmdline) | |
469 | return 0; | |
470 | if (options->listen_addrs != NULL) | |
471 | fatal("%s line %d: ports must be specified before " | |
472 | "ListenAddress.", filename, linenum); | |
473 | if (options->num_ports >= MAX_PORTS) | |
474 | fatal("%s line %d: too many ports.", | |
475 | filename, linenum); | |
476 | arg = strdelim(&cp); | |
477 | if (!arg || *arg == '\0') | |
478 | fatal("%s line %d: missing port number.", | |
479 | filename, linenum); | |
480 | options->ports[options->num_ports++] = a2port(arg); | |
481 | if (options->ports[options->num_ports-1] == 0) | |
482 | fatal("%s line %d: Badly formatted port number.", | |
483 | filename, linenum); | |
484 | break; | |
485 | ||
486 | case sServerKeyBits: | |
487 | intptr = &options->server_key_bits; | |
3c0ef626 | 488 | parse_int: |
e9702f7d | 489 | arg = strdelim(&cp); |
490 | if (!arg || *arg == '\0') | |
491 | fatal("%s line %d: missing integer value.", | |
492 | filename, linenum); | |
493 | value = atoi(arg); | |
494 | if (*intptr == -1) | |
495 | *intptr = value; | |
496 | break; | |
497 | ||
498 | case sLoginGraceTime: | |
499 | intptr = &options->login_grace_time; | |
3c0ef626 | 500 | parse_time: |
e9702f7d | 501 | arg = strdelim(&cp); |
502 | if (!arg || *arg == '\0') | |
503 | fatal("%s line %d: missing time value.", | |
504 | filename, linenum); | |
505 | if ((value = convtime(arg)) == -1) | |
506 | fatal("%s line %d: invalid time value.", | |
507 | filename, linenum); | |
508 | if (*intptr == -1) | |
509 | *intptr = value; | |
510 | break; | |
511 | ||
512 | case sKeyRegenerationTime: | |
513 | intptr = &options->key_regeneration_time; | |
514 | goto parse_time; | |
515 | ||
516 | case sListenAddress: | |
517 | arg = strdelim(&cp); | |
518 | if (!arg || *arg == '\0' || strncmp(arg, "[]", 2) == 0) | |
519 | fatal("%s line %d: missing inet addr.", | |
520 | filename, linenum); | |
521 | if (*arg == '[') { | |
522 | if ((p = strchr(arg, ']')) == NULL) | |
523 | fatal("%s line %d: bad ipv6 inet addr usage.", | |
3c0ef626 | 524 | filename, linenum); |
e9702f7d | 525 | arg++; |
526 | memmove(p, p+1, strlen(p+1)+1); | |
527 | } else if (((p = strchr(arg, ':')) == NULL) || | |
528 | (strchr(p+1, ':') != NULL)) { | |
529 | add_listen_addr(options, arg, 0); | |
3c0ef626 | 530 | break; |
e9702f7d | 531 | } |
532 | if (*p == ':') { | |
533 | u_short port; | |
3c0ef626 | 534 | |
e9702f7d | 535 | p++; |
536 | if (*p == '\0') | |
537 | fatal("%s line %d: bad inet addr:port usage.", | |
3c0ef626 | 538 | filename, linenum); |
e9702f7d | 539 | else { |
540 | *(p-1) = '\0'; | |
541 | if ((port = a2port(p)) == 0) | |
542 | fatal("%s line %d: bad port number.", | |
3c0ef626 | 543 | filename, linenum); |
e9702f7d | 544 | add_listen_addr(options, arg, port); |
3c0ef626 | 545 | } |
e9702f7d | 546 | } else if (*p == '\0') |
547 | add_listen_addr(options, arg, 0); | |
548 | else | |
549 | fatal("%s line %d: bad inet addr usage.", | |
550 | filename, linenum); | |
551 | break; | |
552 | ||
553 | case sHostKeyFile: | |
554 | intptr = &options->num_host_key_files; | |
555 | if (*intptr >= MAX_HOSTKEYS) | |
556 | fatal("%s line %d: too many host keys specified (max %d).", | |
557 | filename, linenum, MAX_HOSTKEYS); | |
558 | charptr = &options->host_key_files[*intptr]; | |
3c0ef626 | 559 | parse_filename: |
e9702f7d | 560 | arg = strdelim(&cp); |
561 | if (!arg || *arg == '\0') | |
562 | fatal("%s line %d: missing file name.", | |
563 | filename, linenum); | |
564 | if (*charptr == NULL) { | |
565 | *charptr = tilde_expand_filename(arg, getuid()); | |
566 | /* increase optional counter */ | |
567 | if (intptr != NULL) | |
568 | *intptr = *intptr + 1; | |
569 | } | |
570 | break; | |
3c0ef626 | 571 | |
e9702f7d | 572 | case sPidFile: |
573 | charptr = &options->pid_file; | |
574 | goto parse_filename; | |
3c0ef626 | 575 | |
e9702f7d | 576 | case sPermitRootLogin: |
577 | intptr = &options->permit_root_login; | |
578 | arg = strdelim(&cp); | |
579 | if (!arg || *arg == '\0') | |
580 | fatal("%s line %d: missing yes/" | |
581 | "without-password/forced-commands-only/no " | |
582 | "argument.", filename, linenum); | |
583 | value = 0; /* silence compiler */ | |
584 | if (strcmp(arg, "without-password") == 0) | |
585 | value = PERMIT_NO_PASSWD; | |
586 | else if (strcmp(arg, "forced-commands-only") == 0) | |
587 | value = PERMIT_FORCED_ONLY; | |
588 | else if (strcmp(arg, "yes") == 0) | |
589 | value = PERMIT_YES; | |
590 | else if (strcmp(arg, "no") == 0) | |
591 | value = PERMIT_NO; | |
592 | else | |
593 | fatal("%s line %d: Bad yes/" | |
594 | "without-password/forced-commands-only/no " | |
595 | "argument: %s", filename, linenum, arg); | |
596 | if (*intptr == -1) | |
597 | *intptr = value; | |
598 | break; | |
3c0ef626 | 599 | |
e9702f7d | 600 | case sIgnoreRhosts: |
601 | intptr = &options->ignore_rhosts; | |
602 | parse_flag: | |
603 | arg = strdelim(&cp); | |
604 | if (!arg || *arg == '\0') | |
605 | fatal("%s line %d: missing yes/no argument.", | |
606 | filename, linenum); | |
607 | value = 0; /* silence compiler */ | |
608 | if (strcmp(arg, "yes") == 0) | |
609 | value = 1; | |
610 | else if (strcmp(arg, "no") == 0) | |
611 | value = 0; | |
612 | else | |
613 | fatal("%s line %d: Bad yes/no argument: %s", | |
614 | filename, linenum, arg); | |
615 | if (*intptr == -1) | |
616 | *intptr = value; | |
617 | break; | |
618 | ||
619 | case sIgnoreUserKnownHosts: | |
620 | intptr = &options->ignore_user_known_hosts; | |
621 | goto parse_flag; | |
622 | ||
623 | case sRhostsAuthentication: | |
624 | intptr = &options->rhosts_authentication; | |
625 | goto parse_flag; | |
626 | ||
627 | case sRhostsRSAAuthentication: | |
628 | intptr = &options->rhosts_rsa_authentication; | |
629 | goto parse_flag; | |
630 | ||
631 | case sHostbasedAuthentication: | |
632 | intptr = &options->hostbased_authentication; | |
633 | goto parse_flag; | |
634 | ||
635 | case sHostbasedUsesNameFromPacketOnly: | |
636 | intptr = &options->hostbased_uses_name_from_packet_only; | |
637 | goto parse_flag; | |
638 | ||
639 | case sRSAAuthentication: | |
640 | intptr = &options->rsa_authentication; | |
641 | goto parse_flag; | |
642 | ||
643 | case sPubkeyAuthentication: | |
644 | intptr = &options->pubkey_authentication; | |
645 | goto parse_flag; | |
905081a4 | 646 | #ifdef GSSAPI |
647 | case sGssAuthentication: | |
648 | intptr = &options->gss_authentication; | |
649 | goto parse_flag; | |
650 | case sGssKeyEx: | |
651 | intptr = &options->gss_keyex; | |
652 | goto parse_flag; | |
653 | case sGssUseSessionCredCache: | |
654 | intptr = &options->gss_use_session_ccache; | |
655 | goto parse_flag; | |
656 | case sGssCleanupCreds: | |
657 | intptr = &options->gss_cleanup_creds; | |
658 | goto parse_flag; | |
659 | #endif | |
3c0ef626 | 660 | #if defined(KRB4) || defined(KRB5) |
e9702f7d | 661 | case sKerberosAuthentication: |
662 | intptr = &options->kerberos_authentication; | |
663 | goto parse_flag; | |
3c0ef626 | 664 | |
e9702f7d | 665 | case sKerberosOrLocalPasswd: |
666 | intptr = &options->kerberos_or_local_passwd; | |
667 | goto parse_flag; | |
3c0ef626 | 668 | |
e9702f7d | 669 | case sKerberosTicketCleanup: |
670 | intptr = &options->kerberos_ticket_cleanup; | |
671 | goto parse_flag; | |
3c0ef626 | 672 | #endif |
673 | #if defined(AFS) || defined(KRB5) | |
e9702f7d | 674 | case sKerberosTgtPassing: |
675 | intptr = &options->kerberos_tgt_passing; | |
676 | goto parse_flag; | |
3c0ef626 | 677 | #endif |
678 | #ifdef AFS | |
e9702f7d | 679 | case sAFSTokenPassing: |
680 | intptr = &options->afs_token_passing; | |
681 | goto parse_flag; | |
3c0ef626 | 682 | #endif |
683 | ||
e9702f7d | 684 | case sPasswordAuthentication: |
685 | intptr = &options->password_authentication; | |
686 | goto parse_flag; | |
3c0ef626 | 687 | |
e9702f7d | 688 | case sKbdInteractiveAuthentication: |
689 | intptr = &options->kbd_interactive_authentication; | |
690 | goto parse_flag; | |
3c0ef626 | 691 | |
e9702f7d | 692 | case sChallengeResponseAuthentication: |
693 | intptr = &options->challenge_response_authentication; | |
694 | goto parse_flag; | |
3c0ef626 | 695 | |
e9702f7d | 696 | case sPrintMotd: |
697 | intptr = &options->print_motd; | |
698 | goto parse_flag; | |
3c0ef626 | 699 | |
e9702f7d | 700 | case sPrintLastLog: |
701 | intptr = &options->print_lastlog; | |
702 | goto parse_flag; | |
3c0ef626 | 703 | |
e9702f7d | 704 | case sX11Forwarding: |
705 | intptr = &options->x11_forwarding; | |
706 | goto parse_flag; | |
3c0ef626 | 707 | |
e9702f7d | 708 | case sX11DisplayOffset: |
709 | intptr = &options->x11_display_offset; | |
710 | goto parse_int; | |
3c0ef626 | 711 | |
e9702f7d | 712 | case sX11UseLocalhost: |
713 | intptr = &options->x11_use_localhost; | |
714 | goto parse_flag; | |
3c0ef626 | 715 | |
e9702f7d | 716 | case sXAuthLocation: |
717 | charptr = &options->xauth_location; | |
718 | goto parse_filename; | |
3c0ef626 | 719 | |
e9702f7d | 720 | case sStrictModes: |
721 | intptr = &options->strict_modes; | |
722 | goto parse_flag; | |
3c0ef626 | 723 | |
e9702f7d | 724 | case sKeepAlives: |
725 | intptr = &options->keepalives; | |
726 | goto parse_flag; | |
3c0ef626 | 727 | |
e9702f7d | 728 | case sEmptyPasswd: |
729 | intptr = &options->permit_empty_passwd; | |
730 | goto parse_flag; | |
731 | ||
732 | case sUseLogin: | |
733 | intptr = &options->use_login; | |
734 | goto parse_flag; | |
735 | ||
736 | case sGatewayPorts: | |
737 | intptr = &options->gateway_ports; | |
738 | goto parse_flag; | |
739 | ||
740 | case sVerifyReverseMapping: | |
741 | intptr = &options->verify_reverse_mapping; | |
742 | goto parse_flag; | |
743 | ||
744 | case sLogFacility: | |
745 | intptr = (int *) &options->log_facility; | |
746 | arg = strdelim(&cp); | |
747 | value = log_facility_number(arg); | |
748 | if (value == SYSLOG_FACILITY_NOT_SET) | |
749 | fatal("%.200s line %d: unsupported log facility '%s'", | |
750 | filename, linenum, arg ? arg : "<NONE>"); | |
751 | if (*intptr == -1) | |
752 | *intptr = (SyslogFacility) value; | |
753 | break; | |
754 | ||
755 | case sLogLevel: | |
756 | intptr = (int *) &options->log_level; | |
757 | arg = strdelim(&cp); | |
758 | value = log_level_number(arg); | |
759 | if (value == SYSLOG_LEVEL_NOT_SET) | |
760 | fatal("%.200s line %d: unsupported log level '%s'", | |
761 | filename, linenum, arg ? arg : "<NONE>"); | |
762 | if (*intptr == -1) | |
763 | *intptr = (LogLevel) value; | |
764 | break; | |
765 | ||
766 | case sAllowTcpForwarding: | |
767 | intptr = &options->allow_tcp_forwarding; | |
768 | goto parse_flag; | |
769 | ||
770 | case sAllowUsers: | |
771 | while ((arg = strdelim(&cp)) && *arg != '\0') { | |
772 | if (options->num_allow_users >= MAX_ALLOW_USERS) | |
773 | fatal("%s line %d: too many allow users.", | |
3c0ef626 | 774 | filename, linenum); |
e9702f7d | 775 | options->allow_users[options->num_allow_users++] = xstrdup(arg); |
776 | } | |
777 | break; | |
3c0ef626 | 778 | |
e9702f7d | 779 | case sDenyUsers: |
780 | while ((arg = strdelim(&cp)) && *arg != '\0') { | |
781 | if (options->num_deny_users >= MAX_DENY_USERS) | |
782 | fatal( "%s line %d: too many deny users.", | |
783 | filename, linenum); | |
784 | options->deny_users[options->num_deny_users++] = xstrdup(arg); | |
785 | } | |
786 | break; | |
3c0ef626 | 787 | |
e9702f7d | 788 | case sAllowGroups: |
789 | while ((arg = strdelim(&cp)) && *arg != '\0') { | |
790 | if (options->num_allow_groups >= MAX_ALLOW_GROUPS) | |
791 | fatal("%s line %d: too many allow groups.", | |
792 | filename, linenum); | |
793 | options->allow_groups[options->num_allow_groups++] = xstrdup(arg); | |
794 | } | |
795 | break; | |
796 | ||
797 | case sDenyGroups: | |
798 | while ((arg = strdelim(&cp)) && *arg != '\0') { | |
799 | if (options->num_deny_groups >= MAX_DENY_GROUPS) | |
800 | fatal("%s line %d: too many deny groups.", | |
801 | filename, linenum); | |
802 | options->deny_groups[options->num_deny_groups++] = xstrdup(arg); | |
3c0ef626 | 803 | } |
e9702f7d | 804 | break; |
805 | ||
806 | case sCiphers: | |
807 | arg = strdelim(&cp); | |
808 | if (!arg || *arg == '\0') | |
809 | fatal("%s line %d: Missing argument.", filename, linenum); | |
810 | if (!ciphers_valid(arg)) | |
811 | fatal("%s line %d: Bad SSH2 cipher spec '%s'.", | |
812 | filename, linenum, arg ? arg : "<NONE>"); | |
813 | if (options->ciphers == NULL) | |
814 | options->ciphers = xstrdup(arg); | |
815 | break; | |
816 | ||
817 | case sMacs: | |
818 | arg = strdelim(&cp); | |
819 | if (!arg || *arg == '\0') | |
820 | fatal("%s line %d: Missing argument.", filename, linenum); | |
821 | if (!mac_valid(arg)) | |
822 | fatal("%s line %d: Bad SSH2 mac spec '%s'.", | |
823 | filename, linenum, arg ? arg : "<NONE>"); | |
824 | if (options->macs == NULL) | |
825 | options->macs = xstrdup(arg); | |
826 | break; | |
827 | ||
828 | case sProtocol: | |
829 | intptr = &options->protocol; | |
830 | arg = strdelim(&cp); | |
831 | if (!arg || *arg == '\0') | |
832 | fatal("%s line %d: Missing argument.", filename, linenum); | |
833 | value = proto_spec(arg); | |
834 | if (value == SSH_PROTO_UNKNOWN) | |
835 | fatal("%s line %d: Bad protocol spec '%s'.", | |
836 | filename, linenum, arg ? arg : "<NONE>"); | |
837 | if (*intptr == SSH_PROTO_UNKNOWN) | |
838 | *intptr = value; | |
839 | break; | |
840 | ||
841 | case sSubsystem: | |
842 | if (options->num_subsystems >= MAX_SUBSYSTEMS) { | |
843 | fatal("%s line %d: too many subsystems defined.", | |
844 | filename, linenum); | |
845 | } | |
846 | arg = strdelim(&cp); | |
847 | if (!arg || *arg == '\0') | |
848 | fatal("%s line %d: Missing subsystem name.", | |
849 | filename, linenum); | |
850 | for (i = 0; i < options->num_subsystems; i++) | |
851 | if (strcmp(arg, options->subsystem_name[i]) == 0) | |
852 | fatal("%s line %d: Subsystem '%s' already defined.", | |
853 | filename, linenum, arg); | |
854 | options->subsystem_name[options->num_subsystems] = xstrdup(arg); | |
855 | arg = strdelim(&cp); | |
856 | if (!arg || *arg == '\0') | |
857 | fatal("%s line %d: Missing subsystem command.", | |
858 | filename, linenum); | |
859 | options->subsystem_command[options->num_subsystems] = xstrdup(arg); | |
860 | options->num_subsystems++; | |
861 | break; | |
862 | ||
863 | case sMaxStartups: | |
864 | arg = strdelim(&cp); | |
865 | if (!arg || *arg == '\0') | |
866 | fatal("%s line %d: Missing MaxStartups spec.", | |
867 | filename, linenum); | |
868 | if ((n = sscanf(arg, "%d:%d:%d", | |
869 | &options->max_startups_begin, | |
870 | &options->max_startups_rate, | |
871 | &options->max_startups)) == 3) { | |
872 | if (options->max_startups_begin > | |
873 | options->max_startups || | |
874 | options->max_startups_rate > 100 || | |
875 | options->max_startups_rate < 1) | |
876 | fatal("%s line %d: Illegal MaxStartups spec.", | |
877 | filename, linenum); | |
878 | } else if (n != 1) | |
879 | fatal("%s line %d: Illegal MaxStartups spec.", | |
880 | filename, linenum); | |
881 | else | |
882 | options->max_startups = options->max_startups_begin; | |
883 | break; | |
884 | ||
885 | case sBanner: | |
886 | charptr = &options->banner; | |
887 | goto parse_filename; | |
888 | /* | |
889 | * These options can contain %X options expanded at | |
890 | * connect time, so that you can specify paths like: | |
891 | * | |
892 | * AuthorizedKeysFile /etc/ssh_keys/%u | |
893 | */ | |
894 | case sAuthorizedKeysFile: | |
895 | case sAuthorizedKeysFile2: | |
896 | charptr = (opcode == sAuthorizedKeysFile ) ? | |
897 | &options->authorized_keys_file : | |
898 | &options->authorized_keys_file2; | |
899 | goto parse_filename; | |
900 | ||
901 | case sClientAliveInterval: | |
902 | intptr = &options->client_alive_interval; | |
903 | goto parse_time; | |
904 | ||
905 | case sClientAliveCountMax: | |
906 | intptr = &options->client_alive_count_max; | |
907 | goto parse_int; | |
908 | ||
909 | case sDeprecated: | |
910 | log("%s line %d: Deprecated option %s", | |
911 | filename, linenum, arg); | |
912 | while (arg) | |
913 | arg = strdelim(&cp); | |
914 | break; | |
915 | ||
916 | default: | |
917 | fatal("%s line %d: Missing handler for opcode %s (%d)", | |
918 | filename, linenum, arg, opcode); | |
919 | } | |
920 | if ((arg = strdelim(&cp)) != NULL && *arg != '\0') | |
921 | fatal("%s line %d: garbage at end of line; \"%.200s\".", | |
922 | filename, linenum, arg); | |
923 | return 0; | |
924 | } | |
925 | ||
926 | /* Reads the server configuration file. */ | |
927 | ||
928 | void | |
929 | read_server_config(ServerOptions *options, const char *filename) | |
930 | { | |
931 | FILE *f; | |
932 | char line[1024]; | |
933 | int linenum; | |
934 | int bad_options = 0; | |
935 | ||
936 | f = fopen(filename, "r"); | |
937 | if (!f) { | |
938 | perror(filename); | |
939 | exit(1); | |
940 | } | |
941 | linenum = 0; | |
942 | while (fgets(line, sizeof(line), f)) { | |
943 | /* Update line number counter. */ | |
944 | linenum++; | |
945 | if (process_server_config_line(options, line, filename, linenum) != 0) | |
946 | bad_options++; | |
3c0ef626 | 947 | } |
948 | fclose(f); | |
949 | if (bad_options > 0) | |
950 | fatal("%s: terminating, %d bad configuration options", | |
951 | filename, bad_options); | |
952 | } |