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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" | |
700318f3 | 13 | RCSID("$OpenBSD: servconf.c,v 1.109 2002/05/15 21:02:52 markus Exp $"); |
3c0ef626 | 14 | |
700318f3 | 15 | #if defined(KRB4) |
16 | #include <krb.h> | |
17 | #endif | |
18 | #if defined(KRB5) | |
19 | #ifdef HEIMDAL | |
3c0ef626 | 20 | #include <krb.h> |
700318f3 | 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 | |
3c0ef626 | 26 | #endif |
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; | |
700318f3 | 48 | /* Use of privilege separation or not */ |
49 | extern int use_privsep; | |
3c0ef626 | 50 | |
51 | /* Initializes the server options to their default values. */ | |
52 | ||
53 | void | |
54 | initialize_server_options(ServerOptions *options) | |
55 | { | |
56 | memset(options, 0, sizeof(*options)); | |
57 | ||
58 | /* Portable-specific options */ | |
59 | options->pam_authentication_via_kbd_int = -1; | |
60 | ||
61 | /* Standard Options */ | |
62 | options->num_ports = 0; | |
63 | options->ports_from_cmdline = 0; | |
64 | options->listen_addrs = NULL; | |
65 | options->num_host_key_files = 0; | |
66 | options->pid_file = NULL; | |
67 | options->server_key_bits = -1; | |
68 | options->login_grace_time = -1; | |
69 | options->key_regeneration_time = -1; | |
70 | options->permit_root_login = PERMIT_NOT_SET; | |
71 | options->ignore_rhosts = -1; | |
72 | options->ignore_user_known_hosts = -1; | |
73 | options->print_motd = -1; | |
74 | options->print_lastlog = -1; | |
75 | options->x11_forwarding = -1; | |
76 | options->x11_display_offset = -1; | |
e9a17296 | 77 | options->x11_use_localhost = -1; |
3c0ef626 | 78 | options->xauth_location = NULL; |
79 | options->strict_modes = -1; | |
80 | options->keepalives = -1; | |
e9a17296 | 81 | options->log_facility = SYSLOG_FACILITY_NOT_SET; |
82 | options->log_level = SYSLOG_LEVEL_NOT_SET; | |
3c0ef626 | 83 | options->rhosts_authentication = -1; |
84 | options->rhosts_rsa_authentication = -1; | |
85 | options->hostbased_authentication = -1; | |
86 | options->hostbased_uses_name_from_packet_only = -1; | |
87 | options->rsa_authentication = -1; | |
88 | options->pubkey_authentication = -1; | |
89 | #if defined(KRB4) || defined(KRB5) | |
90 | options->kerberos_authentication = -1; | |
91 | options->kerberos_or_local_passwd = -1; | |
92 | options->kerberos_ticket_cleanup = -1; | |
93 | #endif | |
94 | #if defined(AFS) || defined(KRB5) | |
95 | options->kerberos_tgt_passing = -1; | |
96 | #endif | |
97 | #ifdef AFS | |
98 | options->afs_token_passing = -1; | |
99 | #endif | |
100 | options->password_authentication = -1; | |
101 | options->kbd_interactive_authentication = -1; | |
102 | options->challenge_response_authentication = -1; | |
103 | options->permit_empty_passwd = -1; | |
104 | options->use_login = -1; | |
105 | options->allow_tcp_forwarding = -1; | |
106 | options->num_allow_users = 0; | |
107 | options->num_deny_users = 0; | |
108 | options->num_allow_groups = 0; | |
109 | options->num_deny_groups = 0; | |
110 | options->ciphers = NULL; | |
111 | options->macs = NULL; | |
112 | options->protocol = SSH_PROTO_UNKNOWN; | |
113 | options->gateway_ports = -1; | |
114 | options->num_subsystems = 0; | |
115 | options->max_startups_begin = -1; | |
116 | options->max_startups_rate = -1; | |
117 | options->max_startups = -1; | |
118 | options->banner = NULL; | |
e9a17296 | 119 | options->verify_reverse_mapping = -1; |
3c0ef626 | 120 | options->client_alive_interval = -1; |
121 | options->client_alive_count_max = -1; | |
122 | options->authorized_keys_file = NULL; | |
123 | options->authorized_keys_file2 = NULL; | |
700318f3 | 124 | |
125 | /* Needs to be accessable in many places */ | |
126 | use_privsep = -1; | |
3c0ef626 | 127 | } |
128 | ||
129 | void | |
130 | fill_default_server_options(ServerOptions *options) | |
131 | { | |
132 | /* Portable-specific options */ | |
133 | if (options->pam_authentication_via_kbd_int == -1) | |
134 | options->pam_authentication_via_kbd_int = 0; | |
135 | ||
136 | /* Standard Options */ | |
137 | if (options->protocol == SSH_PROTO_UNKNOWN) | |
138 | options->protocol = SSH_PROTO_1|SSH_PROTO_2; | |
139 | if (options->num_host_key_files == 0) { | |
140 | /* fill default hostkeys for protocols */ | |
141 | if (options->protocol & SSH_PROTO_1) | |
e9a17296 | 142 | options->host_key_files[options->num_host_key_files++] = |
143 | _PATH_HOST_KEY_FILE; | |
144 | if (options->protocol & SSH_PROTO_2) { | |
145 | options->host_key_files[options->num_host_key_files++] = | |
146 | _PATH_HOST_RSA_KEY_FILE; | |
147 | options->host_key_files[options->num_host_key_files++] = | |
148 | _PATH_HOST_DSA_KEY_FILE; | |
149 | } | |
3c0ef626 | 150 | } |
151 | if (options->num_ports == 0) | |
152 | options->ports[options->num_ports++] = SSH_DEFAULT_PORT; | |
153 | if (options->listen_addrs == NULL) | |
154 | add_listen_addr(options, NULL, 0); | |
155 | if (options->pid_file == NULL) | |
156 | options->pid_file = _PATH_SSH_DAEMON_PID_FILE; | |
157 | if (options->server_key_bits == -1) | |
158 | options->server_key_bits = 768; | |
159 | if (options->login_grace_time == -1) | |
160 | options->login_grace_time = 600; | |
161 | if (options->key_regeneration_time == -1) | |
162 | options->key_regeneration_time = 3600; | |
163 | if (options->permit_root_login == PERMIT_NOT_SET) | |
164 | options->permit_root_login = PERMIT_YES; | |
165 | if (options->ignore_rhosts == -1) | |
166 | options->ignore_rhosts = 1; | |
167 | if (options->ignore_user_known_hosts == -1) | |
168 | options->ignore_user_known_hosts = 0; | |
169 | if (options->print_motd == -1) | |
170 | options->print_motd = 1; | |
171 | if (options->print_lastlog == -1) | |
172 | options->print_lastlog = 1; | |
173 | if (options->x11_forwarding == -1) | |
174 | options->x11_forwarding = 0; | |
175 | if (options->x11_display_offset == -1) | |
176 | options->x11_display_offset = 10; | |
e9a17296 | 177 | if (options->x11_use_localhost == -1) |
178 | options->x11_use_localhost = 1; | |
3c0ef626 | 179 | if (options->xauth_location == NULL) |
180 | options->xauth_location = _PATH_XAUTH; | |
3c0ef626 | 181 | if (options->strict_modes == -1) |
182 | options->strict_modes = 1; | |
183 | if (options->keepalives == -1) | |
184 | options->keepalives = 1; | |
e9a17296 | 185 | if (options->log_facility == SYSLOG_FACILITY_NOT_SET) |
3c0ef626 | 186 | options->log_facility = SYSLOG_FACILITY_AUTH; |
e9a17296 | 187 | if (options->log_level == SYSLOG_LEVEL_NOT_SET) |
3c0ef626 | 188 | options->log_level = SYSLOG_LEVEL_INFO; |
189 | if (options->rhosts_authentication == -1) | |
190 | options->rhosts_authentication = 0; | |
191 | if (options->rhosts_rsa_authentication == -1) | |
192 | options->rhosts_rsa_authentication = 0; | |
193 | if (options->hostbased_authentication == -1) | |
194 | options->hostbased_authentication = 0; | |
195 | if (options->hostbased_uses_name_from_packet_only == -1) | |
196 | options->hostbased_uses_name_from_packet_only = 0; | |
197 | if (options->rsa_authentication == -1) | |
198 | options->rsa_authentication = 1; | |
199 | if (options->pubkey_authentication == -1) | |
200 | options->pubkey_authentication = 1; | |
201 | #if defined(KRB4) || defined(KRB5) | |
202 | if (options->kerberos_authentication == -1) | |
700318f3 | 203 | options->kerberos_authentication = 0; |
3c0ef626 | 204 | if (options->kerberos_or_local_passwd == -1) |
205 | options->kerberos_or_local_passwd = 1; | |
206 | if (options->kerberos_ticket_cleanup == -1) | |
207 | options->kerberos_ticket_cleanup = 1; | |
208 | #endif | |
209 | #if defined(AFS) || defined(KRB5) | |
210 | if (options->kerberos_tgt_passing == -1) | |
211 | options->kerberos_tgt_passing = 0; | |
212 | #endif | |
e9a17296 | 213 | #ifdef AFS |
3c0ef626 | 214 | if (options->afs_token_passing == -1) |
700318f3 | 215 | options->afs_token_passing = 0; |
3c0ef626 | 216 | #endif |
217 | if (options->password_authentication == -1) | |
218 | options->password_authentication = 1; | |
219 | if (options->kbd_interactive_authentication == -1) | |
220 | options->kbd_interactive_authentication = 0; | |
221 | if (options->challenge_response_authentication == -1) | |
222 | options->challenge_response_authentication = 1; | |
223 | if (options->permit_empty_passwd == -1) | |
224 | options->permit_empty_passwd = 0; | |
225 | if (options->use_login == -1) | |
226 | options->use_login = 0; | |
227 | if (options->allow_tcp_forwarding == -1) | |
228 | options->allow_tcp_forwarding = 1; | |
229 | if (options->gateway_ports == -1) | |
230 | options->gateway_ports = 0; | |
231 | if (options->max_startups == -1) | |
232 | options->max_startups = 10; | |
233 | if (options->max_startups_rate == -1) | |
234 | options->max_startups_rate = 100; /* 100% */ | |
235 | if (options->max_startups_begin == -1) | |
236 | options->max_startups_begin = options->max_startups; | |
e9a17296 | 237 | if (options->verify_reverse_mapping == -1) |
238 | options->verify_reverse_mapping = 0; | |
3c0ef626 | 239 | if (options->client_alive_interval == -1) |
e9a17296 | 240 | options->client_alive_interval = 0; |
3c0ef626 | 241 | if (options->client_alive_count_max == -1) |
242 | options->client_alive_count_max = 3; | |
243 | if (options->authorized_keys_file2 == NULL) { | |
244 | /* authorized_keys_file2 falls back to authorized_keys_file */ | |
245 | if (options->authorized_keys_file != NULL) | |
246 | options->authorized_keys_file2 = options->authorized_keys_file; | |
247 | else | |
248 | options->authorized_keys_file2 = _PATH_SSH_USER_PERMITTED_KEYS2; | |
249 | } | |
250 | if (options->authorized_keys_file == NULL) | |
251 | options->authorized_keys_file = _PATH_SSH_USER_PERMITTED_KEYS; | |
700318f3 | 252 | |
253 | /* Turn privilege separation _off_ by default */ | |
254 | if (use_privsep == -1) | |
255 | use_privsep = 0; | |
3c0ef626 | 256 | } |
257 | ||
258 | /* Keyword tokens. */ | |
259 | typedef enum { | |
260 | sBadOption, /* == unknown option */ | |
261 | /* Portable-specific options */ | |
262 | sPAMAuthenticationViaKbdInt, | |
263 | /* Standard Options */ | |
264 | sPort, sHostKeyFile, sServerKeyBits, sLoginGraceTime, sKeyRegenerationTime, | |
265 | sPermitRootLogin, sLogFacility, sLogLevel, | |
266 | sRhostsAuthentication, sRhostsRSAAuthentication, sRSAAuthentication, | |
267 | #if defined(KRB4) || defined(KRB5) | |
268 | sKerberosAuthentication, sKerberosOrLocalPasswd, sKerberosTicketCleanup, | |
269 | #endif | |
270 | #if defined(AFS) || defined(KRB5) | |
271 | sKerberosTgtPassing, | |
272 | #endif | |
273 | #ifdef AFS | |
274 | sAFSTokenPassing, | |
275 | #endif | |
276 | sChallengeResponseAuthentication, | |
277 | sPasswordAuthentication, sKbdInteractiveAuthentication, sListenAddress, | |
278 | sPrintMotd, sPrintLastLog, sIgnoreRhosts, | |
e9a17296 | 279 | sX11Forwarding, sX11DisplayOffset, sX11UseLocalhost, |
3c0ef626 | 280 | sStrictModes, sEmptyPasswd, sKeepAlives, |
281 | sUseLogin, sAllowTcpForwarding, | |
282 | sAllowUsers, sDenyUsers, sAllowGroups, sDenyGroups, | |
283 | sIgnoreUserKnownHosts, sCiphers, sMacs, sProtocol, sPidFile, | |
284 | sGatewayPorts, sPubkeyAuthentication, sXAuthLocation, sSubsystem, sMaxStartups, | |
e9a17296 | 285 | sBanner, sVerifyReverseMapping, sHostbasedAuthentication, |
286 | sHostbasedUsesNameFromPacketOnly, sClientAliveInterval, | |
3c0ef626 | 287 | sClientAliveCountMax, sAuthorizedKeysFile, sAuthorizedKeysFile2, |
700318f3 | 288 | sUsePrivilegeSeparation, |
e9a17296 | 289 | sDeprecated |
3c0ef626 | 290 | } ServerOpCodes; |
291 | ||
292 | /* Textual representation of the tokens. */ | |
293 | static struct { | |
294 | const char *name; | |
295 | ServerOpCodes opcode; | |
296 | } keywords[] = { | |
297 | /* Portable-specific options */ | |
298 | { "PAMAuthenticationViaKbdInt", sPAMAuthenticationViaKbdInt }, | |
299 | /* Standard Options */ | |
300 | { "port", sPort }, | |
301 | { "hostkey", sHostKeyFile }, | |
302 | { "hostdsakey", sHostKeyFile }, /* alias */ | |
303 | { "pidfile", sPidFile }, | |
304 | { "serverkeybits", sServerKeyBits }, | |
305 | { "logingracetime", sLoginGraceTime }, | |
306 | { "keyregenerationinterval", sKeyRegenerationTime }, | |
307 | { "permitrootlogin", sPermitRootLogin }, | |
308 | { "syslogfacility", sLogFacility }, | |
309 | { "loglevel", sLogLevel }, | |
310 | { "rhostsauthentication", sRhostsAuthentication }, | |
311 | { "rhostsrsaauthentication", sRhostsRSAAuthentication }, | |
312 | { "hostbasedauthentication", sHostbasedAuthentication }, | |
313 | { "hostbasedusesnamefrompacketonly", sHostbasedUsesNameFromPacketOnly }, | |
314 | { "rsaauthentication", sRSAAuthentication }, | |
315 | { "pubkeyauthentication", sPubkeyAuthentication }, | |
316 | { "dsaauthentication", sPubkeyAuthentication }, /* alias */ | |
317 | #if defined(KRB4) || defined(KRB5) | |
318 | { "kerberosauthentication", sKerberosAuthentication }, | |
319 | { "kerberosorlocalpasswd", sKerberosOrLocalPasswd }, | |
320 | { "kerberosticketcleanup", sKerberosTicketCleanup }, | |
321 | #endif | |
322 | #if defined(AFS) || defined(KRB5) | |
323 | { "kerberostgtpassing", sKerberosTgtPassing }, | |
324 | #endif | |
325 | #ifdef AFS | |
326 | { "afstokenpassing", sAFSTokenPassing }, | |
327 | #endif | |
328 | { "passwordauthentication", sPasswordAuthentication }, | |
329 | { "kbdinteractiveauthentication", sKbdInteractiveAuthentication }, | |
330 | { "challengeresponseauthentication", sChallengeResponseAuthentication }, | |
331 | { "skeyauthentication", sChallengeResponseAuthentication }, /* alias */ | |
332 | { "checkmail", sDeprecated }, | |
333 | { "listenaddress", sListenAddress }, | |
334 | { "printmotd", sPrintMotd }, | |
335 | { "printlastlog", sPrintLastLog }, | |
336 | { "ignorerhosts", sIgnoreRhosts }, | |
337 | { "ignoreuserknownhosts", sIgnoreUserKnownHosts }, | |
338 | { "x11forwarding", sX11Forwarding }, | |
339 | { "x11displayoffset", sX11DisplayOffset }, | |
e9a17296 | 340 | { "x11uselocalhost", sX11UseLocalhost }, |
3c0ef626 | 341 | { "xauthlocation", sXAuthLocation }, |
342 | { "strictmodes", sStrictModes }, | |
343 | { "permitemptypasswords", sEmptyPasswd }, | |
344 | { "uselogin", sUseLogin }, | |
345 | { "keepalive", sKeepAlives }, | |
346 | { "allowtcpforwarding", sAllowTcpForwarding }, | |
347 | { "allowusers", sAllowUsers }, | |
348 | { "denyusers", sDenyUsers }, | |
349 | { "allowgroups", sAllowGroups }, | |
350 | { "denygroups", sDenyGroups }, | |
351 | { "ciphers", sCiphers }, | |
352 | { "macs", sMacs }, | |
353 | { "protocol", sProtocol }, | |
354 | { "gatewayports", sGatewayPorts }, | |
355 | { "subsystem", sSubsystem }, | |
356 | { "maxstartups", sMaxStartups }, | |
357 | { "banner", sBanner }, | |
e9a17296 | 358 | { "verifyreversemapping", sVerifyReverseMapping }, |
359 | { "reversemappingcheck", sVerifyReverseMapping }, | |
3c0ef626 | 360 | { "clientaliveinterval", sClientAliveInterval }, |
361 | { "clientalivecountmax", sClientAliveCountMax }, | |
362 | { "authorizedkeysfile", sAuthorizedKeysFile }, | |
363 | { "authorizedkeysfile2", sAuthorizedKeysFile2 }, | |
700318f3 | 364 | { "useprivilegeseparation", sUsePrivilegeSeparation}, |
e9a17296 | 365 | { NULL, sBadOption } |
3c0ef626 | 366 | }; |
367 | ||
368 | /* | |
369 | * Returns the number of the token pointed to by cp or sBadOption. | |
370 | */ | |
371 | ||
372 | static ServerOpCodes | |
373 | parse_token(const char *cp, const char *filename, | |
374 | int linenum) | |
375 | { | |
376 | u_int i; | |
377 | ||
378 | for (i = 0; keywords[i].name; i++) | |
379 | if (strcasecmp(cp, keywords[i].name) == 0) | |
380 | return keywords[i].opcode; | |
381 | ||
382 | error("%s: line %d: Bad configuration option: %s", | |
383 | filename, linenum, cp); | |
384 | return sBadOption; | |
385 | } | |
386 | ||
387 | static void | |
388 | add_listen_addr(ServerOptions *options, char *addr, u_short port) | |
389 | { | |
390 | int i; | |
391 | ||
392 | if (options->num_ports == 0) | |
393 | options->ports[options->num_ports++] = SSH_DEFAULT_PORT; | |
394 | if (port == 0) | |
395 | for (i = 0; i < options->num_ports; i++) | |
396 | add_one_listen_addr(options, addr, options->ports[i]); | |
397 | else | |
398 | add_one_listen_addr(options, addr, port); | |
399 | } | |
400 | ||
401 | static void | |
402 | add_one_listen_addr(ServerOptions *options, char *addr, u_short port) | |
403 | { | |
404 | struct addrinfo hints, *ai, *aitop; | |
405 | char strport[NI_MAXSERV]; | |
406 | int gaierr; | |
407 | ||
408 | memset(&hints, 0, sizeof(hints)); | |
409 | hints.ai_family = IPv4or6; | |
410 | hints.ai_socktype = SOCK_STREAM; | |
411 | hints.ai_flags = (addr == NULL) ? AI_PASSIVE : 0; | |
412 | snprintf(strport, sizeof strport, "%d", port); | |
413 | if ((gaierr = getaddrinfo(addr, strport, &hints, &aitop)) != 0) | |
414 | fatal("bad addr or host: %s (%s)", | |
415 | addr ? addr : "<NULL>", | |
416 | gai_strerror(gaierr)); | |
417 | for (ai = aitop; ai->ai_next; ai = ai->ai_next) | |
418 | ; | |
419 | ai->ai_next = options->listen_addrs; | |
420 | options->listen_addrs = aitop; | |
421 | } | |
422 | ||
e9a17296 | 423 | int |
424 | process_server_config_line(ServerOptions *options, char *line, | |
425 | const char *filename, int linenum) | |
3c0ef626 | 426 | { |
3c0ef626 | 427 | char *cp, **charptr, *arg, *p; |
e9a17296 | 428 | int *intptr, value; |
3c0ef626 | 429 | ServerOpCodes opcode; |
430 | int i, n; | |
431 | ||
e9a17296 | 432 | cp = line; |
433 | arg = strdelim(&cp); | |
434 | /* Ignore leading whitespace */ | |
435 | if (*arg == '\0') | |
3c0ef626 | 436 | arg = strdelim(&cp); |
e9a17296 | 437 | if (!arg || !*arg || *arg == '#') |
438 | return 0; | |
439 | intptr = NULL; | |
440 | charptr = NULL; | |
441 | opcode = parse_token(arg, filename, linenum); | |
442 | switch (opcode) { | |
443 | /* Portable-specific options */ | |
444 | case sPAMAuthenticationViaKbdInt: | |
445 | intptr = &options->pam_authentication_via_kbd_int; | |
446 | goto parse_flag; | |
3c0ef626 | 447 | |
e9a17296 | 448 | /* Standard Options */ |
449 | case sBadOption: | |
450 | return -1; | |
451 | case sPort: | |
452 | /* ignore ports from configfile if cmdline specifies ports */ | |
453 | if (options->ports_from_cmdline) | |
454 | return 0; | |
455 | if (options->listen_addrs != NULL) | |
456 | fatal("%s line %d: ports must be specified before " | |
457 | "ListenAddress.", filename, linenum); | |
458 | if (options->num_ports >= MAX_PORTS) | |
459 | fatal("%s line %d: too many ports.", | |
460 | filename, linenum); | |
461 | arg = strdelim(&cp); | |
462 | if (!arg || *arg == '\0') | |
463 | fatal("%s line %d: missing port number.", | |
464 | filename, linenum); | |
465 | options->ports[options->num_ports++] = a2port(arg); | |
466 | if (options->ports[options->num_ports-1] == 0) | |
467 | fatal("%s line %d: Badly formatted port number.", | |
468 | filename, linenum); | |
469 | break; | |
470 | ||
471 | case sServerKeyBits: | |
472 | intptr = &options->server_key_bits; | |
3c0ef626 | 473 | parse_int: |
e9a17296 | 474 | arg = strdelim(&cp); |
475 | if (!arg || *arg == '\0') | |
476 | fatal("%s line %d: missing integer value.", | |
477 | filename, linenum); | |
478 | value = atoi(arg); | |
479 | if (*intptr == -1) | |
480 | *intptr = value; | |
481 | break; | |
482 | ||
483 | case sLoginGraceTime: | |
484 | intptr = &options->login_grace_time; | |
3c0ef626 | 485 | parse_time: |
e9a17296 | 486 | arg = strdelim(&cp); |
487 | if (!arg || *arg == '\0') | |
488 | fatal("%s line %d: missing time value.", | |
489 | filename, linenum); | |
490 | if ((value = convtime(arg)) == -1) | |
491 | fatal("%s line %d: invalid time value.", | |
492 | filename, linenum); | |
493 | if (*intptr == -1) | |
494 | *intptr = value; | |
495 | break; | |
496 | ||
497 | case sKeyRegenerationTime: | |
498 | intptr = &options->key_regeneration_time; | |
499 | goto parse_time; | |
500 | ||
501 | case sListenAddress: | |
502 | arg = strdelim(&cp); | |
503 | if (!arg || *arg == '\0' || strncmp(arg, "[]", 2) == 0) | |
504 | fatal("%s line %d: missing inet addr.", | |
505 | filename, linenum); | |
506 | if (*arg == '[') { | |
507 | if ((p = strchr(arg, ']')) == NULL) | |
508 | fatal("%s line %d: bad ipv6 inet addr usage.", | |
3c0ef626 | 509 | filename, linenum); |
e9a17296 | 510 | arg++; |
511 | memmove(p, p+1, strlen(p+1)+1); | |
512 | } else if (((p = strchr(arg, ':')) == NULL) || | |
513 | (strchr(p+1, ':') != NULL)) { | |
514 | add_listen_addr(options, arg, 0); | |
3c0ef626 | 515 | break; |
e9a17296 | 516 | } |
517 | if (*p == ':') { | |
518 | u_short port; | |
3c0ef626 | 519 | |
e9a17296 | 520 | p++; |
521 | if (*p == '\0') | |
522 | fatal("%s line %d: bad inet addr:port usage.", | |
3c0ef626 | 523 | filename, linenum); |
e9a17296 | 524 | else { |
525 | *(p-1) = '\0'; | |
526 | if ((port = a2port(p)) == 0) | |
527 | fatal("%s line %d: bad port number.", | |
3c0ef626 | 528 | filename, linenum); |
e9a17296 | 529 | add_listen_addr(options, arg, port); |
3c0ef626 | 530 | } |
e9a17296 | 531 | } else if (*p == '\0') |
532 | add_listen_addr(options, arg, 0); | |
533 | else | |
534 | fatal("%s line %d: bad inet addr usage.", | |
535 | filename, linenum); | |
536 | break; | |
537 | ||
538 | case sHostKeyFile: | |
539 | intptr = &options->num_host_key_files; | |
540 | if (*intptr >= MAX_HOSTKEYS) | |
541 | fatal("%s line %d: too many host keys specified (max %d).", | |
542 | filename, linenum, MAX_HOSTKEYS); | |
543 | charptr = &options->host_key_files[*intptr]; | |
3c0ef626 | 544 | parse_filename: |
e9a17296 | 545 | arg = strdelim(&cp); |
546 | if (!arg || *arg == '\0') | |
547 | fatal("%s line %d: missing file name.", | |
548 | filename, linenum); | |
549 | if (*charptr == NULL) { | |
550 | *charptr = tilde_expand_filename(arg, getuid()); | |
551 | /* increase optional counter */ | |
552 | if (intptr != NULL) | |
553 | *intptr = *intptr + 1; | |
554 | } | |
555 | break; | |
3c0ef626 | 556 | |
e9a17296 | 557 | case sPidFile: |
558 | charptr = &options->pid_file; | |
559 | goto parse_filename; | |
3c0ef626 | 560 | |
e9a17296 | 561 | case sPermitRootLogin: |
562 | intptr = &options->permit_root_login; | |
563 | arg = strdelim(&cp); | |
564 | if (!arg || *arg == '\0') | |
565 | fatal("%s line %d: missing yes/" | |
566 | "without-password/forced-commands-only/no " | |
567 | "argument.", filename, linenum); | |
568 | value = 0; /* silence compiler */ | |
569 | if (strcmp(arg, "without-password") == 0) | |
570 | value = PERMIT_NO_PASSWD; | |
571 | else if (strcmp(arg, "forced-commands-only") == 0) | |
572 | value = PERMIT_FORCED_ONLY; | |
573 | else if (strcmp(arg, "yes") == 0) | |
574 | value = PERMIT_YES; | |
575 | else if (strcmp(arg, "no") == 0) | |
576 | value = PERMIT_NO; | |
577 | else | |
578 | fatal("%s line %d: Bad yes/" | |
579 | "without-password/forced-commands-only/no " | |
580 | "argument: %s", filename, linenum, arg); | |
581 | if (*intptr == -1) | |
582 | *intptr = value; | |
583 | break; | |
584 | ||
585 | case sIgnoreRhosts: | |
586 | intptr = &options->ignore_rhosts; | |
3c0ef626 | 587 | parse_flag: |
e9a17296 | 588 | arg = strdelim(&cp); |
589 | if (!arg || *arg == '\0') | |
590 | fatal("%s line %d: missing yes/no argument.", | |
591 | filename, linenum); | |
592 | value = 0; /* silence compiler */ | |
593 | if (strcmp(arg, "yes") == 0) | |
594 | value = 1; | |
595 | else if (strcmp(arg, "no") == 0) | |
596 | value = 0; | |
597 | else | |
598 | fatal("%s line %d: Bad yes/no argument: %s", | |
599 | filename, linenum, arg); | |
600 | if (*intptr == -1) | |
601 | *intptr = value; | |
602 | break; | |
603 | ||
604 | case sIgnoreUserKnownHosts: | |
605 | intptr = &options->ignore_user_known_hosts; | |
606 | goto parse_flag; | |
607 | ||
608 | case sRhostsAuthentication: | |
609 | intptr = &options->rhosts_authentication; | |
610 | goto parse_flag; | |
611 | ||
612 | case sRhostsRSAAuthentication: | |
613 | intptr = &options->rhosts_rsa_authentication; | |
614 | goto parse_flag; | |
615 | ||
616 | case sHostbasedAuthentication: | |
617 | intptr = &options->hostbased_authentication; | |
618 | goto parse_flag; | |
619 | ||
620 | case sHostbasedUsesNameFromPacketOnly: | |
621 | intptr = &options->hostbased_uses_name_from_packet_only; | |
622 | goto parse_flag; | |
623 | ||
624 | case sRSAAuthentication: | |
625 | intptr = &options->rsa_authentication; | |
626 | goto parse_flag; | |
627 | ||
628 | case sPubkeyAuthentication: | |
629 | intptr = &options->pubkey_authentication; | |
630 | goto parse_flag; | |
631 | #if defined(KRB4) || defined(KRB5) | |
632 | case sKerberosAuthentication: | |
633 | intptr = &options->kerberos_authentication; | |
634 | goto parse_flag; | |
3c0ef626 | 635 | |
e9a17296 | 636 | case sKerberosOrLocalPasswd: |
637 | intptr = &options->kerberos_or_local_passwd; | |
638 | goto parse_flag; | |
3c0ef626 | 639 | |
e9a17296 | 640 | case sKerberosTicketCleanup: |
641 | intptr = &options->kerberos_ticket_cleanup; | |
642 | goto parse_flag; | |
643 | #endif | |
644 | #if defined(AFS) || defined(KRB5) | |
645 | case sKerberosTgtPassing: | |
646 | intptr = &options->kerberos_tgt_passing; | |
647 | goto parse_flag; | |
648 | #endif | |
649 | #ifdef AFS | |
650 | case sAFSTokenPassing: | |
651 | intptr = &options->afs_token_passing; | |
652 | goto parse_flag; | |
653 | #endif | |
3c0ef626 | 654 | |
e9a17296 | 655 | case sPasswordAuthentication: |
656 | intptr = &options->password_authentication; | |
657 | goto parse_flag; | |
3c0ef626 | 658 | |
e9a17296 | 659 | case sKbdInteractiveAuthentication: |
660 | intptr = &options->kbd_interactive_authentication; | |
661 | goto parse_flag; | |
3c0ef626 | 662 | |
e9a17296 | 663 | case sChallengeResponseAuthentication: |
664 | intptr = &options->challenge_response_authentication; | |
665 | goto parse_flag; | |
3c0ef626 | 666 | |
e9a17296 | 667 | case sPrintMotd: |
668 | intptr = &options->print_motd; | |
669 | goto parse_flag; | |
3c0ef626 | 670 | |
e9a17296 | 671 | case sPrintLastLog: |
672 | intptr = &options->print_lastlog; | |
673 | goto parse_flag; | |
3c0ef626 | 674 | |
e9a17296 | 675 | case sX11Forwarding: |
676 | intptr = &options->x11_forwarding; | |
677 | goto parse_flag; | |
3c0ef626 | 678 | |
e9a17296 | 679 | case sX11DisplayOffset: |
680 | intptr = &options->x11_display_offset; | |
681 | goto parse_int; | |
3c0ef626 | 682 | |
e9a17296 | 683 | case sX11UseLocalhost: |
684 | intptr = &options->x11_use_localhost; | |
685 | goto parse_flag; | |
3c0ef626 | 686 | |
e9a17296 | 687 | case sXAuthLocation: |
688 | charptr = &options->xauth_location; | |
689 | goto parse_filename; | |
3c0ef626 | 690 | |
e9a17296 | 691 | case sStrictModes: |
692 | intptr = &options->strict_modes; | |
693 | goto parse_flag; | |
3c0ef626 | 694 | |
e9a17296 | 695 | case sKeepAlives: |
696 | intptr = &options->keepalives; | |
697 | goto parse_flag; | |
3c0ef626 | 698 | |
e9a17296 | 699 | case sEmptyPasswd: |
700 | intptr = &options->permit_empty_passwd; | |
701 | goto parse_flag; | |
3c0ef626 | 702 | |
e9a17296 | 703 | case sUseLogin: |
704 | intptr = &options->use_login; | |
705 | goto parse_flag; | |
3c0ef626 | 706 | |
e9a17296 | 707 | case sGatewayPorts: |
708 | intptr = &options->gateway_ports; | |
709 | goto parse_flag; | |
3c0ef626 | 710 | |
e9a17296 | 711 | case sVerifyReverseMapping: |
712 | intptr = &options->verify_reverse_mapping; | |
713 | goto parse_flag; | |
3c0ef626 | 714 | |
e9a17296 | 715 | case sLogFacility: |
716 | intptr = (int *) &options->log_facility; | |
717 | arg = strdelim(&cp); | |
718 | value = log_facility_number(arg); | |
719 | if (value == SYSLOG_FACILITY_NOT_SET) | |
720 | fatal("%.200s line %d: unsupported log facility '%s'", | |
721 | filename, linenum, arg ? arg : "<NONE>"); | |
722 | if (*intptr == -1) | |
723 | *intptr = (SyslogFacility) value; | |
724 | break; | |
725 | ||
726 | case sLogLevel: | |
727 | intptr = (int *) &options->log_level; | |
728 | arg = strdelim(&cp); | |
729 | value = log_level_number(arg); | |
730 | if (value == SYSLOG_LEVEL_NOT_SET) | |
731 | fatal("%.200s line %d: unsupported log level '%s'", | |
732 | filename, linenum, arg ? arg : "<NONE>"); | |
733 | if (*intptr == -1) | |
734 | *intptr = (LogLevel) value; | |
735 | break; | |
736 | ||
737 | case sAllowTcpForwarding: | |
738 | intptr = &options->allow_tcp_forwarding; | |
739 | goto parse_flag; | |
740 | ||
700318f3 | 741 | case sUsePrivilegeSeparation: |
742 | intptr = &use_privsep; | |
743 | goto parse_flag; | |
744 | ||
e9a17296 | 745 | case sAllowUsers: |
746 | while ((arg = strdelim(&cp)) && *arg != '\0') { | |
747 | if (options->num_allow_users >= MAX_ALLOW_USERS) | |
748 | fatal("%s line %d: too many allow users.", | |
749 | filename, linenum); | |
750 | options->allow_users[options->num_allow_users++] = xstrdup(arg); | |
751 | } | |
752 | break; | |
3c0ef626 | 753 | |
e9a17296 | 754 | case sDenyUsers: |
755 | while ((arg = strdelim(&cp)) && *arg != '\0') { | |
756 | if (options->num_deny_users >= MAX_DENY_USERS) | |
757 | fatal( "%s line %d: too many deny users.", | |
758 | filename, linenum); | |
759 | options->deny_users[options->num_deny_users++] = xstrdup(arg); | |
760 | } | |
761 | break; | |
3c0ef626 | 762 | |
e9a17296 | 763 | case sAllowGroups: |
764 | while ((arg = strdelim(&cp)) && *arg != '\0') { | |
765 | if (options->num_allow_groups >= MAX_ALLOW_GROUPS) | |
766 | fatal("%s line %d: too many allow groups.", | |
767 | filename, linenum); | |
768 | options->allow_groups[options->num_allow_groups++] = xstrdup(arg); | |
769 | } | |
770 | break; | |
3c0ef626 | 771 | |
e9a17296 | 772 | case sDenyGroups: |
773 | while ((arg = strdelim(&cp)) && *arg != '\0') { | |
774 | if (options->num_deny_groups >= MAX_DENY_GROUPS) | |
775 | fatal("%s line %d: too many deny groups.", | |
776 | filename, linenum); | |
777 | options->deny_groups[options->num_deny_groups++] = xstrdup(arg); | |
778 | } | |
779 | break; | |
780 | ||
781 | case sCiphers: | |
782 | arg = strdelim(&cp); | |
783 | if (!arg || *arg == '\0') | |
784 | fatal("%s line %d: Missing argument.", filename, linenum); | |
785 | if (!ciphers_valid(arg)) | |
786 | fatal("%s line %d: Bad SSH2 cipher spec '%s'.", | |
787 | filename, linenum, arg ? arg : "<NONE>"); | |
788 | if (options->ciphers == NULL) | |
789 | options->ciphers = xstrdup(arg); | |
790 | break; | |
791 | ||
792 | case sMacs: | |
793 | arg = strdelim(&cp); | |
794 | if (!arg || *arg == '\0') | |
795 | fatal("%s line %d: Missing argument.", filename, linenum); | |
796 | if (!mac_valid(arg)) | |
797 | fatal("%s line %d: Bad SSH2 mac spec '%s'.", | |
798 | filename, linenum, arg ? arg : "<NONE>"); | |
799 | if (options->macs == NULL) | |
800 | options->macs = xstrdup(arg); | |
801 | break; | |
802 | ||
803 | case sProtocol: | |
804 | intptr = &options->protocol; | |
805 | arg = strdelim(&cp); | |
806 | if (!arg || *arg == '\0') | |
807 | fatal("%s line %d: Missing argument.", filename, linenum); | |
808 | value = proto_spec(arg); | |
809 | if (value == SSH_PROTO_UNKNOWN) | |
810 | fatal("%s line %d: Bad protocol spec '%s'.", | |
811 | filename, linenum, arg ? arg : "<NONE>"); | |
812 | if (*intptr == SSH_PROTO_UNKNOWN) | |
813 | *intptr = value; | |
814 | break; | |
815 | ||
816 | case sSubsystem: | |
817 | if (options->num_subsystems >= MAX_SUBSYSTEMS) { | |
818 | fatal("%s line %d: too many subsystems defined.", | |
819 | filename, linenum); | |
820 | } | |
821 | arg = strdelim(&cp); | |
822 | if (!arg || *arg == '\0') | |
823 | fatal("%s line %d: Missing subsystem name.", | |
824 | filename, linenum); | |
825 | for (i = 0; i < options->num_subsystems; i++) | |
826 | if (strcmp(arg, options->subsystem_name[i]) == 0) | |
827 | fatal("%s line %d: Subsystem '%s' already defined.", | |
828 | filename, linenum, arg); | |
829 | options->subsystem_name[options->num_subsystems] = xstrdup(arg); | |
830 | arg = strdelim(&cp); | |
831 | if (!arg || *arg == '\0') | |
832 | fatal("%s line %d: Missing subsystem command.", | |
833 | filename, linenum); | |
834 | options->subsystem_command[options->num_subsystems] = xstrdup(arg); | |
835 | options->num_subsystems++; | |
836 | break; | |
837 | ||
838 | case sMaxStartups: | |
839 | arg = strdelim(&cp); | |
840 | if (!arg || *arg == '\0') | |
841 | fatal("%s line %d: Missing MaxStartups spec.", | |
842 | filename, linenum); | |
843 | if ((n = sscanf(arg, "%d:%d:%d", | |
844 | &options->max_startups_begin, | |
845 | &options->max_startups_rate, | |
846 | &options->max_startups)) == 3) { | |
847 | if (options->max_startups_begin > | |
848 | options->max_startups || | |
849 | options->max_startups_rate > 100 || | |
850 | options->max_startups_rate < 1) | |
3c0ef626 | 851 | fatal("%s line %d: Illegal MaxStartups spec.", |
852 | filename, linenum); | |
e9a17296 | 853 | } else if (n != 1) |
854 | fatal("%s line %d: Illegal MaxStartups spec.", | |
855 | filename, linenum); | |
856 | else | |
857 | options->max_startups = options->max_startups_begin; | |
858 | break; | |
859 | ||
860 | case sBanner: | |
861 | charptr = &options->banner; | |
862 | goto parse_filename; | |
863 | /* | |
864 | * These options can contain %X options expanded at | |
865 | * connect time, so that you can specify paths like: | |
866 | * | |
867 | * AuthorizedKeysFile /etc/ssh_keys/%u | |
868 | */ | |
869 | case sAuthorizedKeysFile: | |
870 | case sAuthorizedKeysFile2: | |
871 | charptr = (opcode == sAuthorizedKeysFile ) ? | |
872 | &options->authorized_keys_file : | |
873 | &options->authorized_keys_file2; | |
874 | goto parse_filename; | |
875 | ||
876 | case sClientAliveInterval: | |
877 | intptr = &options->client_alive_interval; | |
878 | goto parse_time; | |
879 | ||
880 | case sClientAliveCountMax: | |
881 | intptr = &options->client_alive_count_max; | |
882 | goto parse_int; | |
883 | ||
884 | case sDeprecated: | |
885 | log("%s line %d: Deprecated option %s", | |
886 | filename, linenum, arg); | |
887 | while (arg) | |
888 | arg = strdelim(&cp); | |
889 | break; | |
890 | ||
891 | default: | |
892 | fatal("%s line %d: Missing handler for opcode %s (%d)", | |
893 | filename, linenum, arg, opcode); | |
894 | } | |
895 | if ((arg = strdelim(&cp)) != NULL && *arg != '\0') | |
896 | fatal("%s line %d: garbage at end of line; \"%.200s\".", | |
897 | filename, linenum, arg); | |
898 | return 0; | |
899 | } | |
3c0ef626 | 900 | |
e9a17296 | 901 | /* Reads the server configuration file. */ |
3c0ef626 | 902 | |
e9a17296 | 903 | void |
904 | read_server_config(ServerOptions *options, const char *filename) | |
905 | { | |
906 | FILE *f; | |
907 | char line[1024]; | |
908 | int linenum; | |
909 | int bad_options = 0; | |
910 | ||
911 | f = fopen(filename, "r"); | |
912 | if (!f) { | |
913 | perror(filename); | |
914 | exit(1); | |
915 | } | |
916 | linenum = 0; | |
917 | while (fgets(line, sizeof(line), f)) { | |
918 | /* Update line number counter. */ | |
919 | linenum++; | |
920 | if (process_server_config_line(options, line, filename, linenum) != 0) | |
921 | bad_options++; | |
3c0ef626 | 922 | } |
923 | fclose(f); | |
924 | if (bad_options > 0) | |
925 | fatal("%s: terminating, %d bad configuration options", | |
926 | filename, bad_options); | |
927 | } |