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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 1.146 2005/12/08 18:34:11 reyk Exp $"); | |
14 | ||
15 | #include "ssh.h" | |
16 | #include "log.h" | |
17 | #include "servconf.h" | |
18 | #include "xmalloc.h" | |
19 | #include "compat.h" | |
20 | #include "pathnames.h" | |
21 | #include "misc.h" | |
22 | #include "cipher.h" | |
23 | #include "kex.h" | |
24 | #include "mac.h" | |
25 | ||
26 | static void add_listen_addr(ServerOptions *, char *, u_short); | |
27 | static void add_one_listen_addr(ServerOptions *, char *, u_short); | |
28 | ||
29 | /* Use of privilege separation or not */ | |
30 | extern int use_privsep; | |
31 | ||
32 | /* Initializes the server options to their default values. */ | |
33 | ||
34 | void | |
35 | initialize_server_options(ServerOptions *options) | |
36 | { | |
37 | memset(options, 0, sizeof(*options)); | |
38 | ||
39 | /* Portable-specific options */ | |
40 | options->use_pam = -1; | |
41 | ||
42 | /* Standard Options */ | |
43 | options->num_ports = 0; | |
44 | options->ports_from_cmdline = 0; | |
45 | options->listen_addrs = NULL; | |
46 | options->address_family = -1; | |
47 | options->num_host_key_files = 0; | |
48 | options->pid_file = NULL; | |
49 | options->server_key_bits = -1; | |
50 | options->login_grace_time = -1; | |
51 | options->key_regeneration_time = -1; | |
52 | options->permit_root_login = PERMIT_NOT_SET; | |
53 | options->ignore_rhosts = -1; | |
54 | options->ignore_user_known_hosts = -1; | |
55 | options->print_motd = -1; | |
56 | options->print_lastlog = -1; | |
57 | options->x11_forwarding = -1; | |
58 | options->x11_display_offset = -1; | |
59 | options->x11_use_localhost = -1; | |
60 | options->xauth_location = NULL; | |
61 | options->strict_modes = -1; | |
62 | options->tcp_keep_alive = -1; | |
63 | options->log_facility = SYSLOG_FACILITY_NOT_SET; | |
64 | options->log_level = SYSLOG_LEVEL_NOT_SET; | |
65 | options->rhosts_rsa_authentication = -1; | |
66 | options->hostbased_authentication = -1; | |
67 | options->hostbased_uses_name_from_packet_only = -1; | |
68 | options->rsa_authentication = -1; | |
69 | options->pubkey_authentication = -1; | |
70 | options->kerberos_authentication = -1; | |
71 | options->kerberos_or_local_passwd = -1; | |
72 | options->kerberos_ticket_cleanup = -1; | |
73 | options->kerberos_get_afs_token = -1; | |
74 | options->gss_authentication=-1; | |
75 | options->gss_cleanup_creds = -1; | |
76 | options->password_authentication = -1; | |
77 | options->kbd_interactive_authentication = -1; | |
78 | options->challenge_response_authentication = -1; | |
79 | options->permit_empty_passwd = -1; | |
80 | options->permit_user_env = -1; | |
81 | options->use_login = -1; | |
82 | options->compression = -1; | |
83 | options->allow_tcp_forwarding = -1; | |
84 | options->num_allow_users = 0; | |
85 | options->num_deny_users = 0; | |
86 | options->num_allow_groups = 0; | |
87 | options->num_deny_groups = 0; | |
88 | options->ciphers = NULL; | |
89 | options->macs = NULL; | |
90 | options->protocol = SSH_PROTO_UNKNOWN; | |
91 | options->gateway_ports = -1; | |
92 | options->num_subsystems = 0; | |
93 | options->max_startups_begin = -1; | |
94 | options->max_startups_rate = -1; | |
95 | options->max_startups = -1; | |
96 | options->max_authtries = -1; | |
97 | options->banner = NULL; | |
98 | options->use_dns = -1; | |
99 | options->client_alive_interval = -1; | |
100 | options->client_alive_count_max = -1; | |
101 | options->authorized_keys_file = NULL; | |
102 | options->authorized_keys_file2 = NULL; | |
103 | options->num_accept_env = 0; | |
104 | options->permit_tun = -1; | |
105 | ||
106 | /* Needs to be accessable in many places */ | |
107 | use_privsep = -1; | |
108 | } | |
109 | ||
110 | void | |
111 | fill_default_server_options(ServerOptions *options) | |
112 | { | |
113 | /* Portable-specific options */ | |
114 | if (options->use_pam == -1) | |
115 | options->use_pam = 0; | |
116 | ||
117 | /* Standard Options */ | |
118 | if (options->protocol == SSH_PROTO_UNKNOWN) | |
119 | options->protocol = SSH_PROTO_1|SSH_PROTO_2; | |
120 | if (options->num_host_key_files == 0) { | |
121 | /* fill default hostkeys for protocols */ | |
122 | if (options->protocol & SSH_PROTO_1) | |
123 | options->host_key_files[options->num_host_key_files++] = | |
124 | _PATH_HOST_KEY_FILE; | |
125 | if (options->protocol & SSH_PROTO_2) { | |
126 | options->host_key_files[options->num_host_key_files++] = | |
127 | _PATH_HOST_RSA_KEY_FILE; | |
128 | options->host_key_files[options->num_host_key_files++] = | |
129 | _PATH_HOST_DSA_KEY_FILE; | |
130 | } | |
131 | } | |
132 | if (options->num_ports == 0) | |
133 | options->ports[options->num_ports++] = SSH_DEFAULT_PORT; | |
134 | if (options->listen_addrs == NULL) | |
135 | add_listen_addr(options, NULL, 0); | |
136 | if (options->pid_file == NULL) | |
137 | options->pid_file = _PATH_SSH_DAEMON_PID_FILE; | |
138 | if (options->server_key_bits == -1) | |
139 | options->server_key_bits = 768; | |
140 | if (options->login_grace_time == -1) | |
141 | options->login_grace_time = 120; | |
142 | if (options->key_regeneration_time == -1) | |
143 | options->key_regeneration_time = 3600; | |
144 | if (options->permit_root_login == PERMIT_NOT_SET) | |
145 | options->permit_root_login = PERMIT_YES; | |
146 | if (options->ignore_rhosts == -1) | |
147 | options->ignore_rhosts = 1; | |
148 | if (options->ignore_user_known_hosts == -1) | |
149 | options->ignore_user_known_hosts = 0; | |
150 | if (options->print_motd == -1) | |
151 | options->print_motd = 1; | |
152 | if (options->print_lastlog == -1) | |
153 | options->print_lastlog = 1; | |
154 | if (options->x11_forwarding == -1) | |
155 | options->x11_forwarding = 0; | |
156 | if (options->x11_display_offset == -1) | |
157 | options->x11_display_offset = 10; | |
158 | if (options->x11_use_localhost == -1) | |
159 | options->x11_use_localhost = 1; | |
160 | if (options->xauth_location == NULL) | |
161 | options->xauth_location = _PATH_XAUTH; | |
162 | if (options->strict_modes == -1) | |
163 | options->strict_modes = 1; | |
164 | if (options->tcp_keep_alive == -1) | |
165 | options->tcp_keep_alive = 1; | |
166 | if (options->log_facility == SYSLOG_FACILITY_NOT_SET) | |
167 | options->log_facility = SYSLOG_FACILITY_AUTH; | |
168 | if (options->log_level == SYSLOG_LEVEL_NOT_SET) | |
169 | options->log_level = SYSLOG_LEVEL_INFO; | |
170 | if (options->rhosts_rsa_authentication == -1) | |
171 | options->rhosts_rsa_authentication = 0; | |
172 | if (options->hostbased_authentication == -1) | |
173 | options->hostbased_authentication = 0; | |
174 | if (options->hostbased_uses_name_from_packet_only == -1) | |
175 | options->hostbased_uses_name_from_packet_only = 0; | |
176 | if (options->rsa_authentication == -1) | |
177 | options->rsa_authentication = 1; | |
178 | if (options->pubkey_authentication == -1) | |
179 | options->pubkey_authentication = 1; | |
180 | if (options->kerberos_authentication == -1) | |
181 | options->kerberos_authentication = 0; | |
182 | if (options->kerberos_or_local_passwd == -1) | |
183 | options->kerberos_or_local_passwd = 1; | |
184 | if (options->kerberos_ticket_cleanup == -1) | |
185 | options->kerberos_ticket_cleanup = 1; | |
186 | if (options->kerberos_get_afs_token == -1) | |
187 | options->kerberos_get_afs_token = 0; | |
188 | if (options->gss_authentication == -1) | |
189 | options->gss_authentication = 0; | |
190 | if (options->gss_cleanup_creds == -1) | |
191 | options->gss_cleanup_creds = 1; | |
192 | if (options->password_authentication == -1) | |
193 | options->password_authentication = 1; | |
194 | if (options->kbd_interactive_authentication == -1) | |
195 | options->kbd_interactive_authentication = 0; | |
196 | if (options->challenge_response_authentication == -1) | |
197 | options->challenge_response_authentication = 1; | |
198 | if (options->permit_empty_passwd == -1) | |
199 | options->permit_empty_passwd = 0; | |
200 | if (options->permit_user_env == -1) | |
201 | options->permit_user_env = 0; | |
202 | if (options->use_login == -1) | |
203 | options->use_login = 0; | |
204 | if (options->compression == -1) | |
205 | options->compression = COMP_DELAYED; | |
206 | if (options->allow_tcp_forwarding == -1) | |
207 | options->allow_tcp_forwarding = 1; | |
208 | if (options->gateway_ports == -1) | |
209 | options->gateway_ports = 0; | |
210 | if (options->max_startups == -1) | |
211 | options->max_startups = 10; | |
212 | if (options->max_startups_rate == -1) | |
213 | options->max_startups_rate = 100; /* 100% */ | |
214 | if (options->max_startups_begin == -1) | |
215 | options->max_startups_begin = options->max_startups; | |
216 | if (options->max_authtries == -1) | |
217 | options->max_authtries = DEFAULT_AUTH_FAIL_MAX; | |
218 | if (options->use_dns == -1) | |
219 | options->use_dns = 1; | |
220 | if (options->client_alive_interval == -1) | |
221 | options->client_alive_interval = 0; | |
222 | if (options->client_alive_count_max == -1) | |
223 | options->client_alive_count_max = 3; | |
224 | if (options->authorized_keys_file2 == NULL) { | |
225 | /* authorized_keys_file2 falls back to authorized_keys_file */ | |
226 | if (options->authorized_keys_file != NULL) | |
227 | options->authorized_keys_file2 = options->authorized_keys_file; | |
228 | else | |
229 | options->authorized_keys_file2 = _PATH_SSH_USER_PERMITTED_KEYS2; | |
230 | } | |
231 | if (options->authorized_keys_file == NULL) | |
232 | options->authorized_keys_file = _PATH_SSH_USER_PERMITTED_KEYS; | |
233 | if (options->permit_tun == -1) | |
234 | options->permit_tun = SSH_TUNMODE_NO; | |
235 | ||
236 | /* Turn privilege separation on by default */ | |
237 | if (use_privsep == -1) | |
238 | use_privsep = 1; | |
239 | ||
240 | #ifndef HAVE_MMAP | |
241 | if (use_privsep && options->compression == 1) { | |
242 | error("This platform does not support both privilege " | |
243 | "separation and compression"); | |
244 | error("Compression disabled"); | |
245 | options->compression = 0; | |
246 | } | |
247 | #endif | |
248 | ||
249 | } | |
250 | ||
251 | /* Keyword tokens. */ | |
252 | typedef enum { | |
253 | sBadOption, /* == unknown option */ | |
254 | /* Portable-specific options */ | |
255 | sUsePAM, | |
256 | /* Standard Options */ | |
257 | sPort, sHostKeyFile, sServerKeyBits, sLoginGraceTime, sKeyRegenerationTime, | |
258 | sPermitRootLogin, sLogFacility, sLogLevel, | |
259 | sRhostsRSAAuthentication, sRSAAuthentication, | |
260 | sKerberosAuthentication, sKerberosOrLocalPasswd, sKerberosTicketCleanup, | |
261 | sKerberosGetAFSToken, | |
262 | sKerberosTgtPassing, sChallengeResponseAuthentication, | |
263 | sPasswordAuthentication, sKbdInteractiveAuthentication, | |
264 | sListenAddress, sAddressFamily, | |
265 | sPrintMotd, sPrintLastLog, sIgnoreRhosts, | |
266 | sX11Forwarding, sX11DisplayOffset, sX11UseLocalhost, | |
267 | sStrictModes, sEmptyPasswd, sTCPKeepAlive, | |
268 | sPermitUserEnvironment, sUseLogin, sAllowTcpForwarding, sCompression, | |
269 | sAllowUsers, sDenyUsers, sAllowGroups, sDenyGroups, | |
270 | sIgnoreUserKnownHosts, sCiphers, sMacs, sProtocol, sPidFile, | |
271 | sGatewayPorts, sPubkeyAuthentication, sXAuthLocation, sSubsystem, | |
272 | sMaxStartups, sMaxAuthTries, | |
273 | sBanner, sUseDNS, sHostbasedAuthentication, | |
274 | sHostbasedUsesNameFromPacketOnly, sClientAliveInterval, | |
275 | sClientAliveCountMax, sAuthorizedKeysFile, sAuthorizedKeysFile2, | |
276 | sGssAuthentication, sGssCleanupCreds, sAcceptEnv, sPermitTunnel, | |
277 | sUsePrivilegeSeparation, | |
278 | sDeprecated, sUnsupported | |
279 | } ServerOpCodes; | |
280 | ||
281 | /* Textual representation of the tokens. */ | |
282 | static struct { | |
283 | const char *name; | |
284 | ServerOpCodes opcode; | |
285 | } keywords[] = { | |
286 | /* Portable-specific options */ | |
287 | #ifdef USE_PAM | |
288 | { "usepam", sUsePAM }, | |
289 | #else | |
290 | { "usepam", sUnsupported }, | |
291 | #endif | |
292 | { "pamauthenticationviakbdint", sDeprecated }, | |
293 | /* Standard Options */ | |
294 | { "port", sPort }, | |
295 | { "hostkey", sHostKeyFile }, | |
296 | { "hostdsakey", sHostKeyFile }, /* alias */ | |
297 | { "pidfile", sPidFile }, | |
298 | { "serverkeybits", sServerKeyBits }, | |
299 | { "logingracetime", sLoginGraceTime }, | |
300 | { "keyregenerationinterval", sKeyRegenerationTime }, | |
301 | { "permitrootlogin", sPermitRootLogin }, | |
302 | { "syslogfacility", sLogFacility }, | |
303 | { "loglevel", sLogLevel }, | |
304 | { "rhostsauthentication", sDeprecated }, | |
305 | { "rhostsrsaauthentication", sRhostsRSAAuthentication }, | |
306 | { "hostbasedauthentication", sHostbasedAuthentication }, | |
307 | { "hostbasedusesnamefrompacketonly", sHostbasedUsesNameFromPacketOnly }, | |
308 | { "rsaauthentication", sRSAAuthentication }, | |
309 | { "pubkeyauthentication", sPubkeyAuthentication }, | |
310 | { "dsaauthentication", sPubkeyAuthentication }, /* alias */ | |
311 | #ifdef KRB5 | |
312 | { "kerberosauthentication", sKerberosAuthentication }, | |
313 | { "kerberosorlocalpasswd", sKerberosOrLocalPasswd }, | |
314 | { "kerberosticketcleanup", sKerberosTicketCleanup }, | |
315 | #ifdef USE_AFS | |
316 | { "kerberosgetafstoken", sKerberosGetAFSToken }, | |
317 | #else | |
318 | { "kerberosgetafstoken", sUnsupported }, | |
319 | #endif | |
320 | #else | |
321 | { "kerberosauthentication", sUnsupported }, | |
322 | { "kerberosorlocalpasswd", sUnsupported }, | |
323 | { "kerberosticketcleanup", sUnsupported }, | |
324 | { "kerberosgetafstoken", sUnsupported }, | |
325 | #endif | |
326 | { "kerberostgtpassing", sUnsupported }, | |
327 | { "afstokenpassing", sUnsupported }, | |
328 | #ifdef GSSAPI | |
329 | { "gssapiauthentication", sGssAuthentication }, | |
330 | { "gssapicleanupcredentials", sGssCleanupCreds }, | |
331 | #else | |
332 | { "gssapiauthentication", sUnsupported }, | |
333 | { "gssapicleanupcredentials", sUnsupported }, | |
334 | #endif | |
335 | { "passwordauthentication", sPasswordAuthentication }, | |
336 | { "kbdinteractiveauthentication", sKbdInteractiveAuthentication }, | |
337 | { "challengeresponseauthentication", sChallengeResponseAuthentication }, | |
338 | { "skeyauthentication", sChallengeResponseAuthentication }, /* alias */ | |
339 | { "checkmail", sDeprecated }, | |
340 | { "listenaddress", sListenAddress }, | |
341 | { "addressfamily", sAddressFamily }, | |
342 | { "printmotd", sPrintMotd }, | |
343 | { "printlastlog", sPrintLastLog }, | |
344 | { "ignorerhosts", sIgnoreRhosts }, | |
345 | { "ignoreuserknownhosts", sIgnoreUserKnownHosts }, | |
346 | { "x11forwarding", sX11Forwarding }, | |
347 | { "x11displayoffset", sX11DisplayOffset }, | |
348 | { "x11uselocalhost", sX11UseLocalhost }, | |
349 | { "xauthlocation", sXAuthLocation }, | |
350 | { "strictmodes", sStrictModes }, | |
351 | { "permitemptypasswords", sEmptyPasswd }, | |
352 | { "permituserenvironment", sPermitUserEnvironment }, | |
353 | { "uselogin", sUseLogin }, | |
354 | { "compression", sCompression }, | |
355 | { "tcpkeepalive", sTCPKeepAlive }, | |
356 | { "keepalive", sTCPKeepAlive }, /* obsolete alias */ | |
357 | { "allowtcpforwarding", sAllowTcpForwarding }, | |
358 | { "allowusers", sAllowUsers }, | |
359 | { "denyusers", sDenyUsers }, | |
360 | { "allowgroups", sAllowGroups }, | |
361 | { "denygroups", sDenyGroups }, | |
362 | { "ciphers", sCiphers }, | |
363 | { "macs", sMacs }, | |
364 | { "protocol", sProtocol }, | |
365 | { "gatewayports", sGatewayPorts }, | |
366 | { "subsystem", sSubsystem }, | |
367 | { "maxstartups", sMaxStartups }, | |
368 | { "maxauthtries", sMaxAuthTries }, | |
369 | { "banner", sBanner }, | |
370 | { "usedns", sUseDNS }, | |
371 | { "verifyreversemapping", sDeprecated }, | |
372 | { "reversemappingcheck", sDeprecated }, | |
373 | { "clientaliveinterval", sClientAliveInterval }, | |
374 | { "clientalivecountmax", sClientAliveCountMax }, | |
375 | { "authorizedkeysfile", sAuthorizedKeysFile }, | |
376 | { "authorizedkeysfile2", sAuthorizedKeysFile2 }, | |
377 | { "useprivilegeseparation", sUsePrivilegeSeparation}, | |
378 | { "acceptenv", sAcceptEnv }, | |
379 | { "permittunnel", sPermitTunnel }, | |
380 | { NULL, sBadOption } | |
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 | u_int i; | |
406 | ||
407 | if (options->num_ports == 0) | |
408 | options->ports[options->num_ports++] = SSH_DEFAULT_PORT; | |
409 | if (options->address_family == -1) | |
410 | options->address_family = AF_UNSPEC; | |
411 | if (port == 0) | |
412 | for (i = 0; i < options->num_ports; i++) | |
413 | add_one_listen_addr(options, addr, options->ports[i]); | |
414 | else | |
415 | add_one_listen_addr(options, addr, port); | |
416 | } | |
417 | ||
418 | static void | |
419 | add_one_listen_addr(ServerOptions *options, char *addr, u_short port) | |
420 | { | |
421 | struct addrinfo hints, *ai, *aitop; | |
422 | char strport[NI_MAXSERV]; | |
423 | int gaierr; | |
424 | ||
425 | memset(&hints, 0, sizeof(hints)); | |
426 | hints.ai_family = options->address_family; | |
427 | hints.ai_socktype = SOCK_STREAM; | |
428 | hints.ai_flags = (addr == NULL) ? AI_PASSIVE : 0; | |
429 | snprintf(strport, sizeof strport, "%u", port); | |
430 | if ((gaierr = getaddrinfo(addr, strport, &hints, &aitop)) != 0) | |
431 | fatal("bad addr or host: %s (%s)", | |
432 | addr ? addr : "<NULL>", | |
433 | gai_strerror(gaierr)); | |
434 | for (ai = aitop; ai->ai_next; ai = ai->ai_next) | |
435 | ; | |
436 | ai->ai_next = options->listen_addrs; | |
437 | options->listen_addrs = aitop; | |
438 | } | |
439 | ||
440 | int | |
441 | process_server_config_line(ServerOptions *options, char *line, | |
442 | const char *filename, int linenum) | |
443 | { | |
444 | char *cp, **charptr, *arg, *p; | |
445 | int *intptr, value, n; | |
446 | ServerOpCodes opcode; | |
447 | u_short port; | |
448 | u_int i; | |
449 | ||
450 | cp = line; | |
451 | arg = strdelim(&cp); | |
452 | /* Ignore leading whitespace */ | |
453 | if (*arg == '\0') | |
454 | arg = strdelim(&cp); | |
455 | if (!arg || !*arg || *arg == '#') | |
456 | return 0; | |
457 | intptr = NULL; | |
458 | charptr = NULL; | |
459 | opcode = parse_token(arg, filename, linenum); | |
460 | switch (opcode) { | |
461 | /* Portable-specific options */ | |
462 | case sUsePAM: | |
463 | intptr = &options->use_pam; | |
464 | goto parse_flag; | |
465 | ||
466 | /* Standard Options */ | |
467 | case sBadOption: | |
468 | return -1; | |
469 | case sPort: | |
470 | /* ignore ports from configfile if cmdline specifies ports */ | |
471 | if (options->ports_from_cmdline) | |
472 | return 0; | |
473 | if (options->listen_addrs != NULL) | |
474 | fatal("%s line %d: ports must be specified before " | |
475 | "ListenAddress.", filename, linenum); | |
476 | if (options->num_ports >= MAX_PORTS) | |
477 | fatal("%s line %d: too many ports.", | |
478 | filename, linenum); | |
479 | arg = strdelim(&cp); | |
480 | if (!arg || *arg == '\0') | |
481 | fatal("%s line %d: missing port number.", | |
482 | filename, linenum); | |
483 | options->ports[options->num_ports++] = a2port(arg); | |
484 | if (options->ports[options->num_ports-1] == 0) | |
485 | fatal("%s line %d: Badly formatted port number.", | |
486 | filename, linenum); | |
487 | break; | |
488 | ||
489 | case sServerKeyBits: | |
490 | intptr = &options->server_key_bits; | |
491 | parse_int: | |
492 | arg = strdelim(&cp); | |
493 | if (!arg || *arg == '\0') | |
494 | fatal("%s line %d: missing integer value.", | |
495 | filename, linenum); | |
496 | value = atoi(arg); | |
497 | if (*intptr == -1) | |
498 | *intptr = value; | |
499 | break; | |
500 | ||
501 | case sLoginGraceTime: | |
502 | intptr = &options->login_grace_time; | |
503 | parse_time: | |
504 | arg = strdelim(&cp); | |
505 | if (!arg || *arg == '\0') | |
506 | fatal("%s line %d: missing time value.", | |
507 | filename, linenum); | |
508 | if ((value = convtime(arg)) == -1) | |
509 | fatal("%s line %d: invalid time value.", | |
510 | filename, linenum); | |
511 | if (*intptr == -1) | |
512 | *intptr = value; | |
513 | break; | |
514 | ||
515 | case sKeyRegenerationTime: | |
516 | intptr = &options->key_regeneration_time; | |
517 | goto parse_time; | |
518 | ||
519 | case sListenAddress: | |
520 | arg = strdelim(&cp); | |
521 | if (arg == NULL || *arg == '\0') | |
522 | fatal("%s line %d: missing address", | |
523 | filename, linenum); | |
524 | /* check for bare IPv6 address: no "[]" and 2 or more ":" */ | |
525 | if (strchr(arg, '[') == NULL && (p = strchr(arg, ':')) != NULL | |
526 | && strchr(p+1, ':') != NULL) { | |
527 | add_listen_addr(options, arg, 0); | |
528 | break; | |
529 | } | |
530 | p = hpdelim(&arg); | |
531 | if (p == NULL) | |
532 | fatal("%s line %d: bad address:port usage", | |
533 | filename, linenum); | |
534 | p = cleanhostname(p); | |
535 | if (arg == NULL) | |
536 | port = 0; | |
537 | else if ((port = a2port(arg)) == 0) | |
538 | fatal("%s line %d: bad port number", filename, linenum); | |
539 | ||
540 | add_listen_addr(options, p, port); | |
541 | ||
542 | break; | |
543 | ||
544 | case sAddressFamily: | |
545 | arg = strdelim(&cp); | |
546 | if (!arg || *arg == '\0') | |
547 | fatal("%s line %d: missing address family.", | |
548 | filename, linenum); | |
549 | intptr = &options->address_family; | |
550 | if (options->listen_addrs != NULL) | |
551 | fatal("%s line %d: address family must be specified before " | |
552 | "ListenAddress.", filename, linenum); | |
553 | if (strcasecmp(arg, "inet") == 0) | |
554 | value = AF_INET; | |
555 | else if (strcasecmp(arg, "inet6") == 0) | |
556 | value = AF_INET6; | |
557 | else if (strcasecmp(arg, "any") == 0) | |
558 | value = AF_UNSPEC; | |
559 | else | |
560 | fatal("%s line %d: unsupported address family \"%s\".", | |
561 | filename, linenum, arg); | |
562 | if (*intptr == -1) | |
563 | *intptr = value; | |
564 | break; | |
565 | ||
566 | case sHostKeyFile: | |
567 | intptr = &options->num_host_key_files; | |
568 | if (*intptr >= MAX_HOSTKEYS) | |
569 | fatal("%s line %d: too many host keys specified (max %d).", | |
570 | filename, linenum, MAX_HOSTKEYS); | |
571 | charptr = &options->host_key_files[*intptr]; | |
572 | parse_filename: | |
573 | arg = strdelim(&cp); | |
574 | if (!arg || *arg == '\0') | |
575 | fatal("%s line %d: missing file name.", | |
576 | filename, linenum); | |
577 | if (*charptr == NULL) { | |
578 | *charptr = tilde_expand_filename(arg, getuid()); | |
579 | /* increase optional counter */ | |
580 | if (intptr != NULL) | |
581 | *intptr = *intptr + 1; | |
582 | } | |
583 | break; | |
584 | ||
585 | case sPidFile: | |
586 | charptr = &options->pid_file; | |
587 | goto parse_filename; | |
588 | ||
589 | case sPermitRootLogin: | |
590 | intptr = &options->permit_root_login; | |
591 | arg = strdelim(&cp); | |
592 | if (!arg || *arg == '\0') | |
593 | fatal("%s line %d: missing yes/" | |
594 | "without-password/forced-commands-only/no " | |
595 | "argument.", filename, linenum); | |
596 | value = 0; /* silence compiler */ | |
597 | if (strcmp(arg, "without-password") == 0) | |
598 | value = PERMIT_NO_PASSWD; | |
599 | else if (strcmp(arg, "forced-commands-only") == 0) | |
600 | value = PERMIT_FORCED_ONLY; | |
601 | else if (strcmp(arg, "yes") == 0) | |
602 | value = PERMIT_YES; | |
603 | else if (strcmp(arg, "no") == 0) | |
604 | value = PERMIT_NO; | |
605 | else | |
606 | fatal("%s line %d: Bad yes/" | |
607 | "without-password/forced-commands-only/no " | |
608 | "argument: %s", filename, linenum, arg); | |
609 | if (*intptr == -1) | |
610 | *intptr = value; | |
611 | break; | |
612 | ||
613 | case sIgnoreRhosts: | |
614 | intptr = &options->ignore_rhosts; | |
615 | parse_flag: | |
616 | arg = strdelim(&cp); | |
617 | if (!arg || *arg == '\0') | |
618 | fatal("%s line %d: missing yes/no argument.", | |
619 | filename, linenum); | |
620 | value = 0; /* silence compiler */ | |
621 | if (strcmp(arg, "yes") == 0) | |
622 | value = 1; | |
623 | else if (strcmp(arg, "no") == 0) | |
624 | value = 0; | |
625 | else | |
626 | fatal("%s line %d: Bad yes/no argument: %s", | |
627 | filename, linenum, arg); | |
628 | if (*intptr == -1) | |
629 | *intptr = value; | |
630 | break; | |
631 | ||
632 | case sIgnoreUserKnownHosts: | |
633 | intptr = &options->ignore_user_known_hosts; | |
634 | goto parse_flag; | |
635 | ||
636 | case sRhostsRSAAuthentication: | |
637 | intptr = &options->rhosts_rsa_authentication; | |
638 | goto parse_flag; | |
639 | ||
640 | case sHostbasedAuthentication: | |
641 | intptr = &options->hostbased_authentication; | |
642 | goto parse_flag; | |
643 | ||
644 | case sHostbasedUsesNameFromPacketOnly: | |
645 | intptr = &options->hostbased_uses_name_from_packet_only; | |
646 | goto parse_flag; | |
647 | ||
648 | case sRSAAuthentication: | |
649 | intptr = &options->rsa_authentication; | |
650 | goto parse_flag; | |
651 | ||
652 | case sPubkeyAuthentication: | |
653 | intptr = &options->pubkey_authentication; | |
654 | goto parse_flag; | |
655 | ||
656 | case sKerberosAuthentication: | |
657 | intptr = &options->kerberos_authentication; | |
658 | goto parse_flag; | |
659 | ||
660 | case sKerberosOrLocalPasswd: | |
661 | intptr = &options->kerberos_or_local_passwd; | |
662 | goto parse_flag; | |
663 | ||
664 | case sKerberosTicketCleanup: | |
665 | intptr = &options->kerberos_ticket_cleanup; | |
666 | goto parse_flag; | |
667 | ||
668 | case sKerberosGetAFSToken: | |
669 | intptr = &options->kerberos_get_afs_token; | |
670 | goto parse_flag; | |
671 | ||
672 | case sGssAuthentication: | |
673 | intptr = &options->gss_authentication; | |
674 | goto parse_flag; | |
675 | ||
676 | case sGssCleanupCreds: | |
677 | intptr = &options->gss_cleanup_creds; | |
678 | goto parse_flag; | |
679 | ||
680 | case sPasswordAuthentication: | |
681 | intptr = &options->password_authentication; | |
682 | goto parse_flag; | |
683 | ||
684 | case sKbdInteractiveAuthentication: | |
685 | intptr = &options->kbd_interactive_authentication; | |
686 | goto parse_flag; | |
687 | ||
688 | case sChallengeResponseAuthentication: | |
689 | intptr = &options->challenge_response_authentication; | |
690 | goto parse_flag; | |
691 | ||
692 | case sPrintMotd: | |
693 | intptr = &options->print_motd; | |
694 | goto parse_flag; | |
695 | ||
696 | case sPrintLastLog: | |
697 | intptr = &options->print_lastlog; | |
698 | goto parse_flag; | |
699 | ||
700 | case sX11Forwarding: | |
701 | intptr = &options->x11_forwarding; | |
702 | goto parse_flag; | |
703 | ||
704 | case sX11DisplayOffset: | |
705 | intptr = &options->x11_display_offset; | |
706 | goto parse_int; | |
707 | ||
708 | case sX11UseLocalhost: | |
709 | intptr = &options->x11_use_localhost; | |
710 | goto parse_flag; | |
711 | ||
712 | case sXAuthLocation: | |
713 | charptr = &options->xauth_location; | |
714 | goto parse_filename; | |
715 | ||
716 | case sStrictModes: | |
717 | intptr = &options->strict_modes; | |
718 | goto parse_flag; | |
719 | ||
720 | case sTCPKeepAlive: | |
721 | intptr = &options->tcp_keep_alive; | |
722 | goto parse_flag; | |
723 | ||
724 | case sEmptyPasswd: | |
725 | intptr = &options->permit_empty_passwd; | |
726 | goto parse_flag; | |
727 | ||
728 | case sPermitUserEnvironment: | |
729 | intptr = &options->permit_user_env; | |
730 | goto parse_flag; | |
731 | ||
732 | case sUseLogin: | |
733 | intptr = &options->use_login; | |
734 | goto parse_flag; | |
735 | ||
736 | case sCompression: | |
737 | intptr = &options->compression; | |
738 | arg = strdelim(&cp); | |
739 | if (!arg || *arg == '\0') | |
740 | fatal("%s line %d: missing yes/no/delayed " | |
741 | "argument.", filename, linenum); | |
742 | value = 0; /* silence compiler */ | |
743 | if (strcmp(arg, "delayed") == 0) | |
744 | value = COMP_DELAYED; | |
745 | else if (strcmp(arg, "yes") == 0) | |
746 | value = COMP_ZLIB; | |
747 | else if (strcmp(arg, "no") == 0) | |
748 | value = COMP_NONE; | |
749 | else | |
750 | fatal("%s line %d: Bad yes/no/delayed " | |
751 | "argument: %s", filename, linenum, arg); | |
752 | if (*intptr == -1) | |
753 | *intptr = value; | |
754 | break; | |
755 | ||
756 | case sGatewayPorts: | |
757 | intptr = &options->gateway_ports; | |
758 | arg = strdelim(&cp); | |
759 | if (!arg || *arg == '\0') | |
760 | fatal("%s line %d: missing yes/no/clientspecified " | |
761 | "argument.", filename, linenum); | |
762 | value = 0; /* silence compiler */ | |
763 | if (strcmp(arg, "clientspecified") == 0) | |
764 | value = 2; | |
765 | else if (strcmp(arg, "yes") == 0) | |
766 | value = 1; | |
767 | else if (strcmp(arg, "no") == 0) | |
768 | value = 0; | |
769 | else | |
770 | fatal("%s line %d: Bad yes/no/clientspecified " | |
771 | "argument: %s", filename, linenum, arg); | |
772 | if (*intptr == -1) | |
773 | *intptr = value; | |
774 | break; | |
775 | ||
776 | case sUseDNS: | |
777 | intptr = &options->use_dns; | |
778 | goto parse_flag; | |
779 | ||
780 | case sLogFacility: | |
781 | intptr = (int *) &options->log_facility; | |
782 | arg = strdelim(&cp); | |
783 | value = log_facility_number(arg); | |
784 | if (value == SYSLOG_FACILITY_NOT_SET) | |
785 | fatal("%.200s line %d: unsupported log facility '%s'", | |
786 | filename, linenum, arg ? arg : "<NONE>"); | |
787 | if (*intptr == -1) | |
788 | *intptr = (SyslogFacility) value; | |
789 | break; | |
790 | ||
791 | case sLogLevel: | |
792 | intptr = (int *) &options->log_level; | |
793 | arg = strdelim(&cp); | |
794 | value = log_level_number(arg); | |
795 | if (value == SYSLOG_LEVEL_NOT_SET) | |
796 | fatal("%.200s line %d: unsupported log level '%s'", | |
797 | filename, linenum, arg ? arg : "<NONE>"); | |
798 | if (*intptr == -1) | |
799 | *intptr = (LogLevel) value; | |
800 | break; | |
801 | ||
802 | case sAllowTcpForwarding: | |
803 | intptr = &options->allow_tcp_forwarding; | |
804 | goto parse_flag; | |
805 | ||
806 | case sUsePrivilegeSeparation: | |
807 | intptr = &use_privsep; | |
808 | goto parse_flag; | |
809 | ||
810 | case sAllowUsers: | |
811 | while ((arg = strdelim(&cp)) && *arg != '\0') { | |
812 | if (options->num_allow_users >= MAX_ALLOW_USERS) | |
813 | fatal("%s line %d: too many allow users.", | |
814 | filename, linenum); | |
815 | options->allow_users[options->num_allow_users++] = | |
816 | xstrdup(arg); | |
817 | } | |
818 | break; | |
819 | ||
820 | case sDenyUsers: | |
821 | while ((arg = strdelim(&cp)) && *arg != '\0') { | |
822 | if (options->num_deny_users >= MAX_DENY_USERS) | |
823 | fatal( "%s line %d: too many deny users.", | |
824 | filename, linenum); | |
825 | options->deny_users[options->num_deny_users++] = | |
826 | xstrdup(arg); | |
827 | } | |
828 | break; | |
829 | ||
830 | case sAllowGroups: | |
831 | while ((arg = strdelim(&cp)) && *arg != '\0') { | |
832 | if (options->num_allow_groups >= MAX_ALLOW_GROUPS) | |
833 | fatal("%s line %d: too many allow groups.", | |
834 | filename, linenum); | |
835 | options->allow_groups[options->num_allow_groups++] = | |
836 | xstrdup(arg); | |
837 | } | |
838 | break; | |
839 | ||
840 | case sDenyGroups: | |
841 | while ((arg = strdelim(&cp)) && *arg != '\0') { | |
842 | if (options->num_deny_groups >= MAX_DENY_GROUPS) | |
843 | fatal("%s line %d: too many deny groups.", | |
844 | filename, linenum); | |
845 | options->deny_groups[options->num_deny_groups++] = xstrdup(arg); | |
846 | } | |
847 | break; | |
848 | ||
849 | case sCiphers: | |
850 | arg = strdelim(&cp); | |
851 | if (!arg || *arg == '\0') | |
852 | fatal("%s line %d: Missing argument.", filename, linenum); | |
853 | if (!ciphers_valid(arg)) | |
854 | fatal("%s line %d: Bad SSH2 cipher spec '%s'.", | |
855 | filename, linenum, arg ? arg : "<NONE>"); | |
856 | if (options->ciphers == NULL) | |
857 | options->ciphers = xstrdup(arg); | |
858 | break; | |
859 | ||
860 | case sMacs: | |
861 | arg = strdelim(&cp); | |
862 | if (!arg || *arg == '\0') | |
863 | fatal("%s line %d: Missing argument.", filename, linenum); | |
864 | if (!mac_valid(arg)) | |
865 | fatal("%s line %d: Bad SSH2 mac spec '%s'.", | |
866 | filename, linenum, arg ? arg : "<NONE>"); | |
867 | if (options->macs == NULL) | |
868 | options->macs = xstrdup(arg); | |
869 | break; | |
870 | ||
871 | case sProtocol: | |
872 | intptr = &options->protocol; | |
873 | arg = strdelim(&cp); | |
874 | if (!arg || *arg == '\0') | |
875 | fatal("%s line %d: Missing argument.", filename, linenum); | |
876 | value = proto_spec(arg); | |
877 | if (value == SSH_PROTO_UNKNOWN) | |
878 | fatal("%s line %d: Bad protocol spec '%s'.", | |
879 | filename, linenum, arg ? arg : "<NONE>"); | |
880 | if (*intptr == SSH_PROTO_UNKNOWN) | |
881 | *intptr = value; | |
882 | break; | |
883 | ||
884 | case sSubsystem: | |
885 | if (options->num_subsystems >= MAX_SUBSYSTEMS) { | |
886 | fatal("%s line %d: too many subsystems defined.", | |
887 | filename, linenum); | |
888 | } | |
889 | arg = strdelim(&cp); | |
890 | if (!arg || *arg == '\0') | |
891 | fatal("%s line %d: Missing subsystem name.", | |
892 | filename, linenum); | |
893 | for (i = 0; i < options->num_subsystems; i++) | |
894 | if (strcmp(arg, options->subsystem_name[i]) == 0) | |
895 | fatal("%s line %d: Subsystem '%s' already defined.", | |
896 | filename, linenum, arg); | |
897 | options->subsystem_name[options->num_subsystems] = xstrdup(arg); | |
898 | arg = strdelim(&cp); | |
899 | if (!arg || *arg == '\0') | |
900 | fatal("%s line %d: Missing subsystem command.", | |
901 | filename, linenum); | |
902 | options->subsystem_command[options->num_subsystems] = xstrdup(arg); | |
903 | options->num_subsystems++; | |
904 | break; | |
905 | ||
906 | case sMaxStartups: | |
907 | arg = strdelim(&cp); | |
908 | if (!arg || *arg == '\0') | |
909 | fatal("%s line %d: Missing MaxStartups spec.", | |
910 | filename, linenum); | |
911 | if ((n = sscanf(arg, "%d:%d:%d", | |
912 | &options->max_startups_begin, | |
913 | &options->max_startups_rate, | |
914 | &options->max_startups)) == 3) { | |
915 | if (options->max_startups_begin > | |
916 | options->max_startups || | |
917 | options->max_startups_rate > 100 || | |
918 | options->max_startups_rate < 1) | |
919 | fatal("%s line %d: Illegal MaxStartups spec.", | |
920 | filename, linenum); | |
921 | } else if (n != 1) | |
922 | fatal("%s line %d: Illegal MaxStartups spec.", | |
923 | filename, linenum); | |
924 | else | |
925 | options->max_startups = options->max_startups_begin; | |
926 | break; | |
927 | ||
928 | case sMaxAuthTries: | |
929 | intptr = &options->max_authtries; | |
930 | goto parse_int; | |
931 | ||
932 | case sBanner: | |
933 | charptr = &options->banner; | |
934 | goto parse_filename; | |
935 | /* | |
936 | * These options can contain %X options expanded at | |
937 | * connect time, so that you can specify paths like: | |
938 | * | |
939 | * AuthorizedKeysFile /etc/ssh_keys/%u | |
940 | */ | |
941 | case sAuthorizedKeysFile: | |
942 | case sAuthorizedKeysFile2: | |
943 | charptr = (opcode == sAuthorizedKeysFile ) ? | |
944 | &options->authorized_keys_file : | |
945 | &options->authorized_keys_file2; | |
946 | goto parse_filename; | |
947 | ||
948 | case sClientAliveInterval: | |
949 | intptr = &options->client_alive_interval; | |
950 | goto parse_time; | |
951 | ||
952 | case sClientAliveCountMax: | |
953 | intptr = &options->client_alive_count_max; | |
954 | goto parse_int; | |
955 | ||
956 | case sAcceptEnv: | |
957 | while ((arg = strdelim(&cp)) && *arg != '\0') { | |
958 | if (strchr(arg, '=') != NULL) | |
959 | fatal("%s line %d: Invalid environment name.", | |
960 | filename, linenum); | |
961 | if (options->num_accept_env >= MAX_ACCEPT_ENV) | |
962 | fatal("%s line %d: too many allow env.", | |
963 | filename, linenum); | |
964 | options->accept_env[options->num_accept_env++] = | |
965 | xstrdup(arg); | |
966 | } | |
967 | break; | |
968 | ||
969 | case sPermitTunnel: | |
970 | intptr = &options->permit_tun; | |
971 | arg = strdelim(&cp); | |
972 | if (!arg || *arg == '\0') | |
973 | fatal("%s line %d: Missing yes/point-to-point/" | |
974 | "ethernet/no argument.", filename, linenum); | |
975 | value = 0; /* silence compiler */ | |
976 | if (strcasecmp(arg, "ethernet") == 0) | |
977 | value = SSH_TUNMODE_ETHERNET; | |
978 | else if (strcasecmp(arg, "point-to-point") == 0) | |
979 | value = SSH_TUNMODE_POINTOPOINT; | |
980 | else if (strcasecmp(arg, "yes") == 0) | |
981 | value = SSH_TUNMODE_YES; | |
982 | else if (strcasecmp(arg, "no") == 0) | |
983 | value = SSH_TUNMODE_NO; | |
984 | else | |
985 | fatal("%s line %d: Bad yes/point-to-point/ethernet/" | |
986 | "no argument: %s", filename, linenum, arg); | |
987 | if (*intptr == -1) | |
988 | *intptr = value; | |
989 | break; | |
990 | ||
991 | case sDeprecated: | |
992 | logit("%s line %d: Deprecated option %s", | |
993 | filename, linenum, arg); | |
994 | while (arg) | |
995 | arg = strdelim(&cp); | |
996 | break; | |
997 | ||
998 | case sUnsupported: | |
999 | logit("%s line %d: Unsupported option %s", | |
1000 | filename, linenum, arg); | |
1001 | while (arg) | |
1002 | arg = strdelim(&cp); | |
1003 | break; | |
1004 | ||
1005 | default: | |
1006 | fatal("%s line %d: Missing handler for opcode %s (%d)", | |
1007 | filename, linenum, arg, opcode); | |
1008 | } | |
1009 | if ((arg = strdelim(&cp)) != NULL && *arg != '\0') | |
1010 | fatal("%s line %d: garbage at end of line; \"%.200s\".", | |
1011 | filename, linenum, arg); | |
1012 | return 0; | |
1013 | } | |
1014 | ||
1015 | /* Reads the server configuration file. */ | |
1016 | ||
1017 | void | |
1018 | load_server_config(const char *filename, Buffer *conf) | |
1019 | { | |
1020 | char line[1024], *cp; | |
1021 | FILE *f; | |
1022 | ||
1023 | debug2("%s: filename %s", __func__, filename); | |
1024 | if ((f = fopen(filename, "r")) == NULL) { | |
1025 | perror(filename); | |
1026 | exit(1); | |
1027 | } | |
1028 | buffer_clear(conf); | |
1029 | while (fgets(line, sizeof(line), f)) { | |
1030 | /* | |
1031 | * Trim out comments and strip whitespace | |
1032 | * NB - preserve newlines, they are needed to reproduce | |
1033 | * line numbers later for error messages | |
1034 | */ | |
1035 | if ((cp = strchr(line, '#')) != NULL) | |
1036 | memcpy(cp, "\n", 2); | |
1037 | cp = line + strspn(line, " \t\r"); | |
1038 | ||
1039 | buffer_append(conf, cp, strlen(cp)); | |
1040 | } | |
1041 | buffer_append(conf, "\0", 1); | |
1042 | fclose(f); | |
1043 | debug2("%s: done config len = %d", __func__, buffer_len(conf)); | |
1044 | } | |
1045 | ||
1046 | void | |
1047 | parse_server_config(ServerOptions *options, const char *filename, Buffer *conf) | |
1048 | { | |
1049 | int linenum, bad_options = 0; | |
1050 | char *cp, *obuf, *cbuf; | |
1051 | ||
1052 | debug2("%s: config %s len %d", __func__, filename, buffer_len(conf)); | |
1053 | ||
1054 | obuf = cbuf = xstrdup(buffer_ptr(conf)); | |
1055 | linenum = 1; | |
1056 | while ((cp = strsep(&cbuf, "\n")) != NULL) { | |
1057 | if (process_server_config_line(options, cp, filename, | |
1058 | linenum++) != 0) | |
1059 | bad_options++; | |
1060 | } | |
1061 | xfree(obuf); | |
1062 | if (bad_options > 0) | |
1063 | fatal("%s: terminating, %d bad configuration options", | |
1064 | filename, bad_options); | |
1065 | } |