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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 | ||
14 | #include "ssh.h" | |
15 | #include "log.h" | |
16 | #include "servconf.h" | |
17 | #include "xmalloc.h" | |
18 | #include "compat.h" | |
19 | #include "pathnames.h" | |
20 | #include "misc.h" | |
21 | #include "cipher.h" | |
22 | #include "kex.h" | |
23 | #include "mac.h" | |
24 | ||
25 | static void add_listen_addr(ServerOptions *, char *, u_short); | |
26 | static void add_one_listen_addr(ServerOptions *, char *, u_short); | |
27 | ||
28 | /* Use of privilege separation or not */ | |
29 | extern int use_privsep; | |
30 | ||
31 | /* Initializes the server options to their default values. */ | |
32 | ||
33 | void | |
34 | initialize_server_options(ServerOptions *options) | |
35 | { | |
36 | memset(options, 0, sizeof(*options)); | |
37 | ||
38 | /* Portable-specific options */ | |
39 | options->use_pam = -1; | |
40 | ||
41 | /* Standard Options */ | |
42 | options->num_ports = 0; | |
43 | options->ports_from_cmdline = 0; | |
44 | options->listen_addrs = NULL; | |
45 | options->address_family = -1; | |
46 | options->num_host_key_files = 0; | |
47 | options->pid_file = NULL; | |
48 | options->server_key_bits = -1; | |
49 | options->login_grace_time = -1; | |
50 | options->key_regeneration_time = -1; | |
51 | options->permit_root_login = PERMIT_NOT_SET; | |
52 | options->ignore_rhosts = -1; | |
53 | options->ignore_user_known_hosts = -1; | |
54 | options->print_motd = -1; | |
55 | options->print_lastlog = -1; | |
56 | options->x11_forwarding = -1; | |
57 | options->x11_display_offset = -1; | |
58 | options->x11_use_localhost = -1; | |
59 | options->xauth_location = NULL; | |
60 | options->strict_modes = -1; | |
61 | options->tcp_keep_alive = -1; | |
62 | options->log_facility = SYSLOG_FACILITY_NOT_SET; | |
63 | options->log_level = SYSLOG_LEVEL_NOT_SET; | |
64 | options->rhosts_rsa_authentication = -1; | |
65 | options->hostbased_authentication = -1; | |
66 | options->hostbased_uses_name_from_packet_only = -1; | |
67 | options->rsa_authentication = -1; | |
68 | options->pubkey_authentication = -1; | |
69 | options->kerberos_authentication = -1; | |
70 | options->kerberos_or_local_passwd = -1; | |
71 | options->kerberos_ticket_cleanup = -1; | |
72 | options->kerberos_get_afs_token = -1; | |
73 | options->gss_authentication=-1; | |
74 | options->gss_cleanup_creds = -1; | |
75 | options->password_authentication = -1; | |
76 | options->kbd_interactive_authentication = -1; | |
77 | options->challenge_response_authentication = -1; | |
78 | options->permit_empty_passwd = -1; | |
79 | options->permit_user_env = -1; | |
80 | options->use_login = -1; | |
81 | options->compression = -1; | |
82 | options->allow_tcp_forwarding = -1; | |
83 | options->num_allow_users = 0; | |
84 | options->num_deny_users = 0; | |
85 | options->num_allow_groups = 0; | |
86 | options->num_deny_groups = 0; | |
87 | options->ciphers = NULL; | |
88 | options->macs = NULL; | |
89 | options->protocol = SSH_PROTO_UNKNOWN; | |
90 | options->gateway_ports = -1; | |
91 | options->num_subsystems = 0; | |
92 | options->max_startups_begin = -1; | |
93 | options->max_startups_rate = -1; | |
94 | options->max_startups = -1; | |
95 | options->max_authtries = -1; | |
96 | options->banner = NULL; | |
97 | options->use_dns = -1; | |
98 | options->client_alive_interval = -1; | |
99 | options->client_alive_count_max = -1; | |
100 | options->authorized_keys_file = NULL; | |
101 | options->authorized_keys_file2 = NULL; | |
102 | options->num_accept_env = 0; | |
103 | options->permit_tun = -1; | |
104 | ||
105 | /* Needs to be accessable in many places */ | |
106 | use_privsep = -1; | |
107 | } | |
108 | ||
109 | void | |
110 | fill_default_server_options(ServerOptions *options) | |
111 | { | |
112 | /* Portable-specific options */ | |
113 | if (options->use_pam == -1) | |
114 | options->use_pam = 0; | |
115 | ||
116 | /* Standard Options */ | |
117 | if (options->protocol == SSH_PROTO_UNKNOWN) | |
118 | options->protocol = SSH_PROTO_1|SSH_PROTO_2; | |
119 | if (options->num_host_key_files == 0) { | |
120 | /* fill default hostkeys for protocols */ | |
121 | if (options->protocol & SSH_PROTO_1) | |
122 | options->host_key_files[options->num_host_key_files++] = | |
123 | _PATH_HOST_KEY_FILE; | |
124 | if (options->protocol & SSH_PROTO_2) { | |
125 | options->host_key_files[options->num_host_key_files++] = | |
126 | _PATH_HOST_RSA_KEY_FILE; | |
127 | options->host_key_files[options->num_host_key_files++] = | |
128 | _PATH_HOST_DSA_KEY_FILE; | |
129 | } | |
130 | } | |
131 | if (options->num_ports == 0) | |
132 | options->ports[options->num_ports++] = SSH_DEFAULT_PORT; | |
133 | if (options->listen_addrs == NULL) | |
134 | add_listen_addr(options, NULL, 0); | |
135 | if (options->pid_file == NULL) | |
136 | options->pid_file = _PATH_SSH_DAEMON_PID_FILE; | |
137 | if (options->server_key_bits == -1) | |
138 | options->server_key_bits = 768; | |
139 | if (options->login_grace_time == -1) | |
140 | options->login_grace_time = 120; | |
141 | if (options->key_regeneration_time == -1) | |
142 | options->key_regeneration_time = 3600; | |
143 | if (options->permit_root_login == PERMIT_NOT_SET) | |
144 | options->permit_root_login = PERMIT_YES; | |
145 | if (options->ignore_rhosts == -1) | |
146 | options->ignore_rhosts = 1; | |
147 | if (options->ignore_user_known_hosts == -1) | |
148 | options->ignore_user_known_hosts = 0; | |
149 | if (options->print_motd == -1) | |
150 | options->print_motd = 1; | |
151 | if (options->print_lastlog == -1) | |
152 | options->print_lastlog = 1; | |
153 | if (options->x11_forwarding == -1) | |
154 | options->x11_forwarding = 0; | |
155 | if (options->x11_display_offset == -1) | |
156 | options->x11_display_offset = 10; | |
157 | if (options->x11_use_localhost == -1) | |
158 | options->x11_use_localhost = 1; | |
159 | if (options->xauth_location == NULL) | |
160 | options->xauth_location = _PATH_XAUTH; | |
161 | if (options->strict_modes == -1) | |
162 | options->strict_modes = 1; | |
163 | if (options->tcp_keep_alive == -1) | |
164 | options->tcp_keep_alive = 1; | |
165 | if (options->log_facility == SYSLOG_FACILITY_NOT_SET) | |
166 | options->log_facility = SYSLOG_FACILITY_AUTH; | |
167 | if (options->log_level == SYSLOG_LEVEL_NOT_SET) | |
168 | options->log_level = SYSLOG_LEVEL_INFO; | |
169 | if (options->rhosts_rsa_authentication == -1) | |
170 | options->rhosts_rsa_authentication = 0; | |
171 | if (options->hostbased_authentication == -1) | |
172 | options->hostbased_authentication = 0; | |
173 | if (options->hostbased_uses_name_from_packet_only == -1) | |
174 | options->hostbased_uses_name_from_packet_only = 0; | |
175 | if (options->rsa_authentication == -1) | |
176 | options->rsa_authentication = 1; | |
177 | if (options->pubkey_authentication == -1) | |
178 | options->pubkey_authentication = 1; | |
179 | if (options->kerberos_authentication == -1) | |
180 | options->kerberos_authentication = 0; | |
181 | if (options->kerberos_or_local_passwd == -1) | |
182 | options->kerberos_or_local_passwd = 1; | |
183 | if (options->kerberos_ticket_cleanup == -1) | |
184 | options->kerberos_ticket_cleanup = 1; | |
185 | if (options->kerberos_get_afs_token == -1) | |
186 | options->kerberos_get_afs_token = 0; | |
187 | if (options->gss_authentication == -1) | |
188 | options->gss_authentication = 0; | |
189 | if (options->gss_cleanup_creds == -1) | |
190 | options->gss_cleanup_creds = 1; | |
191 | if (options->password_authentication == -1) | |
192 | options->password_authentication = 1; | |
193 | if (options->kbd_interactive_authentication == -1) | |
194 | options->kbd_interactive_authentication = 0; | |
195 | if (options->challenge_response_authentication == -1) | |
196 | options->challenge_response_authentication = 1; | |
197 | if (options->permit_empty_passwd == -1) | |
198 | options->permit_empty_passwd = 0; | |
199 | if (options->permit_user_env == -1) | |
200 | options->permit_user_env = 0; | |
201 | if (options->use_login == -1) | |
202 | options->use_login = 0; | |
203 | if (options->compression == -1) | |
204 | options->compression = COMP_DELAYED; | |
205 | if (options->allow_tcp_forwarding == -1) | |
206 | options->allow_tcp_forwarding = 1; | |
207 | if (options->gateway_ports == -1) | |
208 | options->gateway_ports = 0; | |
209 | if (options->max_startups == -1) | |
210 | options->max_startups = 10; | |
211 | if (options->max_startups_rate == -1) | |
212 | options->max_startups_rate = 100; /* 100% */ | |
213 | if (options->max_startups_begin == -1) | |
214 | options->max_startups_begin = options->max_startups; | |
215 | if (options->max_authtries == -1) | |
216 | options->max_authtries = DEFAULT_AUTH_FAIL_MAX; | |
217 | if (options->use_dns == -1) | |
218 | options->use_dns = 1; | |
219 | if (options->client_alive_interval == -1) | |
220 | options->client_alive_interval = 0; | |
221 | if (options->client_alive_count_max == -1) | |
222 | options->client_alive_count_max = 3; | |
223 | if (options->authorized_keys_file2 == NULL) { | |
224 | /* authorized_keys_file2 falls back to authorized_keys_file */ | |
225 | if (options->authorized_keys_file != NULL) | |
226 | options->authorized_keys_file2 = options->authorized_keys_file; | |
227 | else | |
228 | options->authorized_keys_file2 = _PATH_SSH_USER_PERMITTED_KEYS2; | |
229 | } | |
230 | if (options->authorized_keys_file == NULL) | |
231 | options->authorized_keys_file = _PATH_SSH_USER_PERMITTED_KEYS; | |
232 | if (options->permit_tun == -1) | |
233 | options->permit_tun = SSH_TUNMODE_NO; | |
234 | ||
235 | /* Turn privilege separation on by default */ | |
236 | if (use_privsep == -1) | |
237 | use_privsep = 1; | |
238 | ||
239 | #ifndef HAVE_MMAP | |
240 | if (use_privsep && options->compression == 1) { | |
241 | error("This platform does not support both privilege " | |
242 | "separation and compression"); | |
243 | error("Compression disabled"); | |
244 | options->compression = 0; | |
245 | } | |
246 | #endif | |
247 | ||
248 | } | |
249 | ||
250 | /* Keyword tokens. */ | |
251 | typedef enum { | |
252 | sBadOption, /* == unknown option */ | |
253 | /* Portable-specific options */ | |
254 | sUsePAM, | |
255 | /* Standard Options */ | |
256 | sPort, sHostKeyFile, sServerKeyBits, sLoginGraceTime, sKeyRegenerationTime, | |
257 | sPermitRootLogin, sLogFacility, sLogLevel, | |
258 | sRhostsRSAAuthentication, sRSAAuthentication, | |
259 | sKerberosAuthentication, sKerberosOrLocalPasswd, sKerberosTicketCleanup, | |
260 | sKerberosGetAFSToken, | |
261 | sKerberosTgtPassing, sChallengeResponseAuthentication, | |
262 | sPasswordAuthentication, sKbdInteractiveAuthentication, | |
263 | sListenAddress, sAddressFamily, | |
264 | sPrintMotd, sPrintLastLog, sIgnoreRhosts, | |
265 | sX11Forwarding, sX11DisplayOffset, sX11UseLocalhost, | |
266 | sStrictModes, sEmptyPasswd, sTCPKeepAlive, | |
267 | sPermitUserEnvironment, sUseLogin, sAllowTcpForwarding, sCompression, | |
268 | sAllowUsers, sDenyUsers, sAllowGroups, sDenyGroups, | |
269 | sIgnoreUserKnownHosts, sCiphers, sMacs, sProtocol, sPidFile, | |
270 | sGatewayPorts, sPubkeyAuthentication, sXAuthLocation, sSubsystem, | |
271 | sMaxStartups, sMaxAuthTries, | |
272 | sBanner, sUseDNS, sHostbasedAuthentication, | |
273 | sHostbasedUsesNameFromPacketOnly, sClientAliveInterval, | |
274 | sClientAliveCountMax, sAuthorizedKeysFile, sAuthorizedKeysFile2, | |
275 | sGssAuthentication, sGssCleanupCreds, sAcceptEnv, sPermitTunnel, | |
276 | sUsePrivilegeSeparation, | |
277 | sDeprecated, sUnsupported | |
278 | } ServerOpCodes; | |
279 | ||
280 | /* Textual representation of the tokens. */ | |
281 | static struct { | |
282 | const char *name; | |
283 | ServerOpCodes opcode; | |
284 | } keywords[] = { | |
285 | /* Portable-specific options */ | |
286 | #ifdef USE_PAM | |
287 | { "usepam", sUsePAM }, | |
288 | #else | |
289 | { "usepam", sUnsupported }, | |
290 | #endif | |
291 | { "pamauthenticationviakbdint", sDeprecated }, | |
292 | /* Standard Options */ | |
293 | { "port", sPort }, | |
294 | { "hostkey", sHostKeyFile }, | |
295 | { "hostdsakey", sHostKeyFile }, /* alias */ | |
296 | { "pidfile", sPidFile }, | |
297 | { "serverkeybits", sServerKeyBits }, | |
298 | { "logingracetime", sLoginGraceTime }, | |
299 | { "keyregenerationinterval", sKeyRegenerationTime }, | |
300 | { "permitrootlogin", sPermitRootLogin }, | |
301 | { "syslogfacility", sLogFacility }, | |
302 | { "loglevel", sLogLevel }, | |
303 | { "rhostsauthentication", sDeprecated }, | |
304 | { "rhostsrsaauthentication", sRhostsRSAAuthentication }, | |
305 | { "hostbasedauthentication", sHostbasedAuthentication }, | |
306 | { "hostbasedusesnamefrompacketonly", sHostbasedUsesNameFromPacketOnly }, | |
307 | { "rsaauthentication", sRSAAuthentication }, | |
308 | { "pubkeyauthentication", sPubkeyAuthentication }, | |
309 | { "dsaauthentication", sPubkeyAuthentication }, /* alias */ | |
310 | #ifdef KRB5 | |
311 | { "kerberosauthentication", sKerberosAuthentication }, | |
312 | { "kerberosorlocalpasswd", sKerberosOrLocalPasswd }, | |
313 | { "kerberosticketcleanup", sKerberosTicketCleanup }, | |
314 | #ifdef USE_AFS | |
315 | { "kerberosgetafstoken", sKerberosGetAFSToken }, | |
316 | #else | |
317 | { "kerberosgetafstoken", sUnsupported }, | |
318 | #endif | |
319 | #else | |
320 | { "kerberosauthentication", sUnsupported }, | |
321 | { "kerberosorlocalpasswd", sUnsupported }, | |
322 | { "kerberosticketcleanup", sUnsupported }, | |
323 | { "kerberosgetafstoken", sUnsupported }, | |
324 | #endif | |
325 | { "kerberostgtpassing", sUnsupported }, | |
326 | { "afstokenpassing", sUnsupported }, | |
327 | #ifdef GSSAPI | |
328 | { "gssapiauthentication", sGssAuthentication }, | |
329 | { "gssapicleanupcredentials", sGssCleanupCreds }, | |
330 | #else | |
331 | { "gssapiauthentication", sUnsupported }, | |
332 | { "gssapicleanupcredentials", sUnsupported }, | |
333 | #endif | |
334 | { "passwordauthentication", sPasswordAuthentication }, | |
335 | { "kbdinteractiveauthentication", sKbdInteractiveAuthentication }, | |
336 | { "challengeresponseauthentication", sChallengeResponseAuthentication }, | |
337 | { "skeyauthentication", sChallengeResponseAuthentication }, /* alias */ | |
338 | { "checkmail", sDeprecated }, | |
339 | { "listenaddress", sListenAddress }, | |
340 | { "addressfamily", sAddressFamily }, | |
341 | { "printmotd", sPrintMotd }, | |
342 | { "printlastlog", sPrintLastLog }, | |
343 | { "ignorerhosts", sIgnoreRhosts }, | |
344 | { "ignoreuserknownhosts", sIgnoreUserKnownHosts }, | |
345 | { "x11forwarding", sX11Forwarding }, | |
346 | { "x11displayoffset", sX11DisplayOffset }, | |
347 | { "x11uselocalhost", sX11UseLocalhost }, | |
348 | { "xauthlocation", sXAuthLocation }, | |
349 | { "strictmodes", sStrictModes }, | |
350 | { "permitemptypasswords", sEmptyPasswd }, | |
351 | { "permituserenvironment", sPermitUserEnvironment }, | |
352 | { "uselogin", sUseLogin }, | |
353 | { "compression", sCompression }, | |
354 | { "tcpkeepalive", sTCPKeepAlive }, | |
355 | { "keepalive", sTCPKeepAlive }, /* obsolete alias */ | |
356 | { "allowtcpforwarding", sAllowTcpForwarding }, | |
357 | { "allowusers", sAllowUsers }, | |
358 | { "denyusers", sDenyUsers }, | |
359 | { "allowgroups", sAllowGroups }, | |
360 | { "denygroups", sDenyGroups }, | |
361 | { "ciphers", sCiphers }, | |
362 | { "macs", sMacs }, | |
363 | { "protocol", sProtocol }, | |
364 | { "gatewayports", sGatewayPorts }, | |
365 | { "subsystem", sSubsystem }, | |
366 | { "maxstartups", sMaxStartups }, | |
367 | { "maxauthtries", sMaxAuthTries }, | |
368 | { "banner", sBanner }, | |
369 | { "usedns", sUseDNS }, | |
370 | { "verifyreversemapping", sDeprecated }, | |
371 | { "reversemappingcheck", sDeprecated }, | |
372 | { "clientaliveinterval", sClientAliveInterval }, | |
373 | { "clientalivecountmax", sClientAliveCountMax }, | |
374 | { "authorizedkeysfile", sAuthorizedKeysFile }, | |
375 | { "authorizedkeysfile2", sAuthorizedKeysFile2 }, | |
376 | { "useprivilegeseparation", sUsePrivilegeSeparation}, | |
377 | { "acceptenv", sAcceptEnv }, | |
378 | { "permittunnel", sPermitTunnel }, | |
379 | { NULL, sBadOption } | |
380 | }; | |
381 | ||
382 | /* | |
383 | * Returns the number of the token pointed to by cp or sBadOption. | |
384 | */ | |
385 | ||
386 | static ServerOpCodes | |
387 | parse_token(const char *cp, const char *filename, | |
388 | int linenum) | |
389 | { | |
390 | u_int i; | |
391 | ||
392 | for (i = 0; keywords[i].name; i++) | |
393 | if (strcasecmp(cp, keywords[i].name) == 0) | |
394 | return keywords[i].opcode; | |
395 | ||
396 | error("%s: line %d: Bad configuration option: %s", | |
397 | filename, linenum, cp); | |
398 | return sBadOption; | |
399 | } | |
400 | ||
401 | static void | |
402 | add_listen_addr(ServerOptions *options, char *addr, u_short port) | |
403 | { | |
404 | u_int i; | |
405 | ||
406 | if (options->num_ports == 0) | |
407 | options->ports[options->num_ports++] = SSH_DEFAULT_PORT; | |
408 | if (options->address_family == -1) | |
409 | options->address_family = AF_UNSPEC; | |
410 | if (port == 0) | |
411 | for (i = 0; i < options->num_ports; i++) | |
412 | add_one_listen_addr(options, addr, options->ports[i]); | |
413 | else | |
414 | add_one_listen_addr(options, addr, port); | |
415 | } | |
416 | ||
417 | static void | |
418 | add_one_listen_addr(ServerOptions *options, char *addr, u_short port) | |
419 | { | |
420 | struct addrinfo hints, *ai, *aitop; | |
421 | char strport[NI_MAXSERV]; | |
422 | int gaierr; | |
423 | ||
424 | memset(&hints, 0, sizeof(hints)); | |
425 | hints.ai_family = options->address_family; | |
426 | hints.ai_socktype = SOCK_STREAM; | |
427 | hints.ai_flags = (addr == NULL) ? AI_PASSIVE : 0; | |
428 | snprintf(strport, sizeof strport, "%u", port); | |
429 | if ((gaierr = getaddrinfo(addr, strport, &hints, &aitop)) != 0) | |
430 | fatal("bad addr or host: %s (%s)", | |
431 | addr ? addr : "<NULL>", | |
432 | gai_strerror(gaierr)); | |
433 | for (ai = aitop; ai->ai_next; ai = ai->ai_next) | |
434 | ; | |
435 | ai->ai_next = options->listen_addrs; | |
436 | options->listen_addrs = aitop; | |
437 | } | |
438 | ||
439 | int | |
440 | process_server_config_line(ServerOptions *options, char *line, | |
441 | const char *filename, int linenum) | |
442 | { | |
443 | char *cp, **charptr, *arg, *p; | |
444 | int *intptr, value, n; | |
445 | ServerOpCodes opcode; | |
446 | u_short port; | |
447 | u_int i; | |
448 | ||
449 | cp = line; | |
450 | arg = strdelim(&cp); | |
451 | /* Ignore leading whitespace */ | |
452 | if (*arg == '\0') | |
453 | arg = strdelim(&cp); | |
454 | if (!arg || !*arg || *arg == '#') | |
455 | return 0; | |
456 | intptr = NULL; | |
457 | charptr = NULL; | |
458 | opcode = parse_token(arg, filename, linenum); | |
459 | switch (opcode) { | |
460 | /* Portable-specific options */ | |
461 | case sUsePAM: | |
462 | intptr = &options->use_pam; | |
463 | goto parse_flag; | |
464 | ||
465 | /* Standard Options */ | |
466 | case sBadOption: | |
467 | return -1; | |
468 | case sPort: | |
469 | /* ignore ports from configfile if cmdline specifies ports */ | |
470 | if (options->ports_from_cmdline) | |
471 | return 0; | |
472 | if (options->listen_addrs != NULL) | |
473 | fatal("%s line %d: ports must be specified before " | |
474 | "ListenAddress.", filename, linenum); | |
475 | if (options->num_ports >= MAX_PORTS) | |
476 | fatal("%s line %d: too many ports.", | |
477 | filename, linenum); | |
478 | arg = strdelim(&cp); | |
479 | if (!arg || *arg == '\0') | |
480 | fatal("%s line %d: missing port number.", | |
481 | filename, linenum); | |
482 | options->ports[options->num_ports++] = a2port(arg); | |
483 | if (options->ports[options->num_ports-1] == 0) | |
484 | fatal("%s line %d: Badly formatted port number.", | |
485 | filename, linenum); | |
486 | break; | |
487 | ||
488 | case sServerKeyBits: | |
489 | intptr = &options->server_key_bits; | |
490 | parse_int: | |
491 | arg = strdelim(&cp); | |
492 | if (!arg || *arg == '\0') | |
493 | fatal("%s line %d: missing integer value.", | |
494 | filename, linenum); | |
495 | value = atoi(arg); | |
496 | if (*intptr == -1) | |
497 | *intptr = value; | |
498 | break; | |
499 | ||
500 | case sLoginGraceTime: | |
501 | intptr = &options->login_grace_time; | |
502 | parse_time: | |
503 | arg = strdelim(&cp); | |
504 | if (!arg || *arg == '\0') | |
505 | fatal("%s line %d: missing time value.", | |
506 | filename, linenum); | |
507 | if ((value = convtime(arg)) == -1) | |
508 | fatal("%s line %d: invalid time value.", | |
509 | filename, linenum); | |
510 | if (*intptr == -1) | |
511 | *intptr = value; | |
512 | break; | |
513 | ||
514 | case sKeyRegenerationTime: | |
515 | intptr = &options->key_regeneration_time; | |
516 | goto parse_time; | |
517 | ||
518 | case sListenAddress: | |
519 | arg = strdelim(&cp); | |
520 | if (arg == NULL || *arg == '\0') | |
521 | fatal("%s line %d: missing address", | |
522 | filename, linenum); | |
523 | /* check for bare IPv6 address: no "[]" and 2 or more ":" */ | |
524 | if (strchr(arg, '[') == NULL && (p = strchr(arg, ':')) != NULL | |
525 | && strchr(p+1, ':') != NULL) { | |
526 | add_listen_addr(options, arg, 0); | |
527 | break; | |
528 | } | |
529 | p = hpdelim(&arg); | |
530 | if (p == NULL) | |
531 | fatal("%s line %d: bad address:port usage", | |
532 | filename, linenum); | |
533 | p = cleanhostname(p); | |
534 | if (arg == NULL) | |
535 | port = 0; | |
536 | else if ((port = a2port(arg)) == 0) | |
537 | fatal("%s line %d: bad port number", filename, linenum); | |
538 | ||
539 | add_listen_addr(options, p, port); | |
540 | ||
541 | break; | |
542 | ||
543 | case sAddressFamily: | |
544 | arg = strdelim(&cp); | |
545 | if (!arg || *arg == '\0') | |
546 | fatal("%s line %d: missing address family.", | |
547 | filename, linenum); | |
548 | intptr = &options->address_family; | |
549 | if (options->listen_addrs != NULL) | |
550 | fatal("%s line %d: address family must be specified before " | |
551 | "ListenAddress.", filename, linenum); | |
552 | if (strcasecmp(arg, "inet") == 0) | |
553 | value = AF_INET; | |
554 | else if (strcasecmp(arg, "inet6") == 0) | |
555 | value = AF_INET6; | |
556 | else if (strcasecmp(arg, "any") == 0) | |
557 | value = AF_UNSPEC; | |
558 | else | |
559 | fatal("%s line %d: unsupported address family \"%s\".", | |
560 | filename, linenum, arg); | |
561 | if (*intptr == -1) | |
562 | *intptr = value; | |
563 | break; | |
564 | ||
565 | case sHostKeyFile: | |
566 | intptr = &options->num_host_key_files; | |
567 | if (*intptr >= MAX_HOSTKEYS) | |
568 | fatal("%s line %d: too many host keys specified (max %d).", | |
569 | filename, linenum, MAX_HOSTKEYS); | |
570 | charptr = &options->host_key_files[*intptr]; | |
571 | parse_filename: | |
572 | arg = strdelim(&cp); | |
573 | if (!arg || *arg == '\0') | |
574 | fatal("%s line %d: missing file name.", | |
575 | filename, linenum); | |
576 | if (*charptr == NULL) { | |
577 | *charptr = tilde_expand_filename(arg, getuid()); | |
578 | /* increase optional counter */ | |
579 | if (intptr != NULL) | |
580 | *intptr = *intptr + 1; | |
581 | } | |
582 | break; | |
583 | ||
584 | case sPidFile: | |
585 | charptr = &options->pid_file; | |
586 | goto parse_filename; | |
587 | ||
588 | case sPermitRootLogin: | |
589 | intptr = &options->permit_root_login; | |
590 | arg = strdelim(&cp); | |
591 | if (!arg || *arg == '\0') | |
592 | fatal("%s line %d: missing yes/" | |
593 | "without-password/forced-commands-only/no " | |
594 | "argument.", filename, linenum); | |
595 | value = 0; /* silence compiler */ | |
596 | if (strcmp(arg, "without-password") == 0) | |
597 | value = PERMIT_NO_PASSWD; | |
598 | else if (strcmp(arg, "forced-commands-only") == 0) | |
599 | value = PERMIT_FORCED_ONLY; | |
600 | else if (strcmp(arg, "yes") == 0) | |
601 | value = PERMIT_YES; | |
602 | else if (strcmp(arg, "no") == 0) | |
603 | value = PERMIT_NO; | |
604 | else | |
605 | fatal("%s line %d: Bad yes/" | |
606 | "without-password/forced-commands-only/no " | |
607 | "argument: %s", filename, linenum, arg); | |
608 | if (*intptr == -1) | |
609 | *intptr = value; | |
610 | break; | |
611 | ||
612 | case sIgnoreRhosts: | |
613 | intptr = &options->ignore_rhosts; | |
614 | parse_flag: | |
615 | arg = strdelim(&cp); | |
616 | if (!arg || *arg == '\0') | |
617 | fatal("%s line %d: missing yes/no argument.", | |
618 | filename, linenum); | |
619 | value = 0; /* silence compiler */ | |
620 | if (strcmp(arg, "yes") == 0) | |
621 | value = 1; | |
622 | else if (strcmp(arg, "no") == 0) | |
623 | value = 0; | |
624 | else | |
625 | fatal("%s line %d: Bad yes/no argument: %s", | |
626 | filename, linenum, arg); | |
627 | if (*intptr == -1) | |
628 | *intptr = value; | |
629 | break; | |
630 | ||
631 | case sIgnoreUserKnownHosts: | |
632 | intptr = &options->ignore_user_known_hosts; | |
633 | goto parse_flag; | |
634 | ||
635 | case sRhostsRSAAuthentication: | |
636 | intptr = &options->rhosts_rsa_authentication; | |
637 | goto parse_flag; | |
638 | ||
639 | case sHostbasedAuthentication: | |
640 | intptr = &options->hostbased_authentication; | |
641 | goto parse_flag; | |
642 | ||
643 | case sHostbasedUsesNameFromPacketOnly: | |
644 | intptr = &options->hostbased_uses_name_from_packet_only; | |
645 | goto parse_flag; | |
646 | ||
647 | case sRSAAuthentication: | |
648 | intptr = &options->rsa_authentication; | |
649 | goto parse_flag; | |
650 | ||
651 | case sPubkeyAuthentication: | |
652 | intptr = &options->pubkey_authentication; | |
653 | goto parse_flag; | |
654 | ||
655 | case sKerberosAuthentication: | |
656 | intptr = &options->kerberos_authentication; | |
657 | goto parse_flag; | |
658 | ||
659 | case sKerberosOrLocalPasswd: | |
660 | intptr = &options->kerberos_or_local_passwd; | |
661 | goto parse_flag; | |
662 | ||
663 | case sKerberosTicketCleanup: | |
664 | intptr = &options->kerberos_ticket_cleanup; | |
665 | goto parse_flag; | |
666 | ||
667 | case sKerberosGetAFSToken: | |
668 | intptr = &options->kerberos_get_afs_token; | |
669 | goto parse_flag; | |
670 | ||
671 | case sGssAuthentication: | |
672 | intptr = &options->gss_authentication; | |
673 | goto parse_flag; | |
674 | ||
675 | case sGssCleanupCreds: | |
676 | intptr = &options->gss_cleanup_creds; | |
677 | goto parse_flag; | |
678 | ||
679 | case sPasswordAuthentication: | |
680 | intptr = &options->password_authentication; | |
681 | goto parse_flag; | |
682 | ||
683 | case sKbdInteractiveAuthentication: | |
684 | intptr = &options->kbd_interactive_authentication; | |
685 | goto parse_flag; | |
686 | ||
687 | case sChallengeResponseAuthentication: | |
688 | intptr = &options->challenge_response_authentication; | |
689 | goto parse_flag; | |
690 | ||
691 | case sPrintMotd: | |
692 | intptr = &options->print_motd; | |
693 | goto parse_flag; | |
694 | ||
695 | case sPrintLastLog: | |
696 | intptr = &options->print_lastlog; | |
697 | goto parse_flag; | |
698 | ||
699 | case sX11Forwarding: | |
700 | intptr = &options->x11_forwarding; | |
701 | goto parse_flag; | |
702 | ||
703 | case sX11DisplayOffset: | |
704 | intptr = &options->x11_display_offset; | |
705 | goto parse_int; | |
706 | ||
707 | case sX11UseLocalhost: | |
708 | intptr = &options->x11_use_localhost; | |
709 | goto parse_flag; | |
710 | ||
711 | case sXAuthLocation: | |
712 | charptr = &options->xauth_location; | |
713 | goto parse_filename; | |
714 | ||
715 | case sStrictModes: | |
716 | intptr = &options->strict_modes; | |
717 | goto parse_flag; | |
718 | ||
719 | case sTCPKeepAlive: | |
720 | intptr = &options->tcp_keep_alive; | |
721 | goto parse_flag; | |
722 | ||
723 | case sEmptyPasswd: | |
724 | intptr = &options->permit_empty_passwd; | |
725 | goto parse_flag; | |
726 | ||
727 | case sPermitUserEnvironment: | |
728 | intptr = &options->permit_user_env; | |
729 | goto parse_flag; | |
730 | ||
731 | case sUseLogin: | |
732 | intptr = &options->use_login; | |
733 | goto parse_flag; | |
734 | ||
735 | case sCompression: | |
736 | intptr = &options->compression; | |
737 | arg = strdelim(&cp); | |
738 | if (!arg || *arg == '\0') | |
739 | fatal("%s line %d: missing yes/no/delayed " | |
740 | "argument.", filename, linenum); | |
741 | value = 0; /* silence compiler */ | |
742 | if (strcmp(arg, "delayed") == 0) | |
743 | value = COMP_DELAYED; | |
744 | else if (strcmp(arg, "yes") == 0) | |
745 | value = COMP_ZLIB; | |
746 | else if (strcmp(arg, "no") == 0) | |
747 | value = COMP_NONE; | |
748 | else | |
749 | fatal("%s line %d: Bad yes/no/delayed " | |
750 | "argument: %s", filename, linenum, arg); | |
751 | if (*intptr == -1) | |
752 | *intptr = value; | |
753 | break; | |
754 | ||
755 | case sGatewayPorts: | |
756 | intptr = &options->gateway_ports; | |
757 | arg = strdelim(&cp); | |
758 | if (!arg || *arg == '\0') | |
759 | fatal("%s line %d: missing yes/no/clientspecified " | |
760 | "argument.", filename, linenum); | |
761 | value = 0; /* silence compiler */ | |
762 | if (strcmp(arg, "clientspecified") == 0) | |
763 | value = 2; | |
764 | else if (strcmp(arg, "yes") == 0) | |
765 | value = 1; | |
766 | else if (strcmp(arg, "no") == 0) | |
767 | value = 0; | |
768 | else | |
769 | fatal("%s line %d: Bad yes/no/clientspecified " | |
770 | "argument: %s", filename, linenum, arg); | |
771 | if (*intptr == -1) | |
772 | *intptr = value; | |
773 | break; | |
774 | ||
775 | case sUseDNS: | |
776 | intptr = &options->use_dns; | |
777 | goto parse_flag; | |
778 | ||
779 | case sLogFacility: | |
780 | intptr = (int *) &options->log_facility; | |
781 | arg = strdelim(&cp); | |
782 | value = log_facility_number(arg); | |
783 | if (value == SYSLOG_FACILITY_NOT_SET) | |
784 | fatal("%.200s line %d: unsupported log facility '%s'", | |
785 | filename, linenum, arg ? arg : "<NONE>"); | |
786 | if (*intptr == -1) | |
787 | *intptr = (SyslogFacility) value; | |
788 | break; | |
789 | ||
790 | case sLogLevel: | |
791 | intptr = (int *) &options->log_level; | |
792 | arg = strdelim(&cp); | |
793 | value = log_level_number(arg); | |
794 | if (value == SYSLOG_LEVEL_NOT_SET) | |
795 | fatal("%.200s line %d: unsupported log level '%s'", | |
796 | filename, linenum, arg ? arg : "<NONE>"); | |
797 | if (*intptr == -1) | |
798 | *intptr = (LogLevel) value; | |
799 | break; | |
800 | ||
801 | case sAllowTcpForwarding: | |
802 | intptr = &options->allow_tcp_forwarding; | |
803 | goto parse_flag; | |
804 | ||
805 | case sUsePrivilegeSeparation: | |
806 | intptr = &use_privsep; | |
807 | goto parse_flag; | |
808 | ||
809 | case sAllowUsers: | |
810 | while ((arg = strdelim(&cp)) && *arg != '\0') { | |
811 | if (options->num_allow_users >= MAX_ALLOW_USERS) | |
812 | fatal("%s line %d: too many allow users.", | |
813 | filename, linenum); | |
814 | options->allow_users[options->num_allow_users++] = | |
815 | xstrdup(arg); | |
816 | } | |
817 | break; | |
818 | ||
819 | case sDenyUsers: | |
820 | while ((arg = strdelim(&cp)) && *arg != '\0') { | |
821 | if (options->num_deny_users >= MAX_DENY_USERS) | |
822 | fatal( "%s line %d: too many deny users.", | |
823 | filename, linenum); | |
824 | options->deny_users[options->num_deny_users++] = | |
825 | xstrdup(arg); | |
826 | } | |
827 | break; | |
828 | ||
829 | case sAllowGroups: | |
830 | while ((arg = strdelim(&cp)) && *arg != '\0') { | |
831 | if (options->num_allow_groups >= MAX_ALLOW_GROUPS) | |
832 | fatal("%s line %d: too many allow groups.", | |
833 | filename, linenum); | |
834 | options->allow_groups[options->num_allow_groups++] = | |
835 | xstrdup(arg); | |
836 | } | |
837 | break; | |
838 | ||
839 | case sDenyGroups: | |
840 | while ((arg = strdelim(&cp)) && *arg != '\0') { | |
841 | if (options->num_deny_groups >= MAX_DENY_GROUPS) | |
842 | fatal("%s line %d: too many deny groups.", | |
843 | filename, linenum); | |
844 | options->deny_groups[options->num_deny_groups++] = xstrdup(arg); | |
845 | } | |
846 | break; | |
847 | ||
848 | case sCiphers: | |
849 | arg = strdelim(&cp); | |
850 | if (!arg || *arg == '\0') | |
851 | fatal("%s line %d: Missing argument.", filename, linenum); | |
852 | if (!ciphers_valid(arg)) | |
853 | fatal("%s line %d: Bad SSH2 cipher spec '%s'.", | |
854 | filename, linenum, arg ? arg : "<NONE>"); | |
855 | if (options->ciphers == NULL) | |
856 | options->ciphers = xstrdup(arg); | |
857 | break; | |
858 | ||
859 | case sMacs: | |
860 | arg = strdelim(&cp); | |
861 | if (!arg || *arg == '\0') | |
862 | fatal("%s line %d: Missing argument.", filename, linenum); | |
863 | if (!mac_valid(arg)) | |
864 | fatal("%s line %d: Bad SSH2 mac spec '%s'.", | |
865 | filename, linenum, arg ? arg : "<NONE>"); | |
866 | if (options->macs == NULL) | |
867 | options->macs = xstrdup(arg); | |
868 | break; | |
869 | ||
870 | case sProtocol: | |
871 | intptr = &options->protocol; | |
872 | arg = strdelim(&cp); | |
873 | if (!arg || *arg == '\0') | |
874 | fatal("%s line %d: Missing argument.", filename, linenum); | |
875 | value = proto_spec(arg); | |
876 | if (value == SSH_PROTO_UNKNOWN) | |
877 | fatal("%s line %d: Bad protocol spec '%s'.", | |
878 | filename, linenum, arg ? arg : "<NONE>"); | |
879 | if (*intptr == SSH_PROTO_UNKNOWN) | |
880 | *intptr = value; | |
881 | break; | |
882 | ||
883 | case sSubsystem: | |
884 | if (options->num_subsystems >= MAX_SUBSYSTEMS) { | |
885 | fatal("%s line %d: too many subsystems defined.", | |
886 | filename, linenum); | |
887 | } | |
888 | arg = strdelim(&cp); | |
889 | if (!arg || *arg == '\0') | |
890 | fatal("%s line %d: Missing subsystem name.", | |
891 | filename, linenum); | |
892 | for (i = 0; i < options->num_subsystems; i++) | |
893 | if (strcmp(arg, options->subsystem_name[i]) == 0) | |
894 | fatal("%s line %d: Subsystem '%s' already defined.", | |
895 | filename, linenum, arg); | |
896 | options->subsystem_name[options->num_subsystems] = xstrdup(arg); | |
897 | arg = strdelim(&cp); | |
898 | if (!arg || *arg == '\0') | |
899 | fatal("%s line %d: Missing subsystem command.", | |
900 | filename, linenum); | |
901 | options->subsystem_command[options->num_subsystems] = xstrdup(arg); | |
902 | options->num_subsystems++; | |
903 | break; | |
904 | ||
905 | case sMaxStartups: | |
906 | arg = strdelim(&cp); | |
907 | if (!arg || *arg == '\0') | |
908 | fatal("%s line %d: Missing MaxStartups spec.", | |
909 | filename, linenum); | |
910 | if ((n = sscanf(arg, "%d:%d:%d", | |
911 | &options->max_startups_begin, | |
912 | &options->max_startups_rate, | |
913 | &options->max_startups)) == 3) { | |
914 | if (options->max_startups_begin > | |
915 | options->max_startups || | |
916 | options->max_startups_rate > 100 || | |
917 | options->max_startups_rate < 1) | |
918 | fatal("%s line %d: Illegal MaxStartups spec.", | |
919 | filename, linenum); | |
920 | } else if (n != 1) | |
921 | fatal("%s line %d: Illegal MaxStartups spec.", | |
922 | filename, linenum); | |
923 | else | |
924 | options->max_startups = options->max_startups_begin; | |
925 | break; | |
926 | ||
927 | case sMaxAuthTries: | |
928 | intptr = &options->max_authtries; | |
929 | goto parse_int; | |
930 | ||
931 | case sBanner: | |
932 | charptr = &options->banner; | |
933 | goto parse_filename; | |
934 | /* | |
935 | * These options can contain %X options expanded at | |
936 | * connect time, so that you can specify paths like: | |
937 | * | |
938 | * AuthorizedKeysFile /etc/ssh_keys/%u | |
939 | */ | |
940 | case sAuthorizedKeysFile: | |
941 | case sAuthorizedKeysFile2: | |
942 | charptr = (opcode == sAuthorizedKeysFile ) ? | |
943 | &options->authorized_keys_file : | |
944 | &options->authorized_keys_file2; | |
945 | goto parse_filename; | |
946 | ||
947 | case sClientAliveInterval: | |
948 | intptr = &options->client_alive_interval; | |
949 | goto parse_time; | |
950 | ||
951 | case sClientAliveCountMax: | |
952 | intptr = &options->client_alive_count_max; | |
953 | goto parse_int; | |
954 | ||
955 | case sAcceptEnv: | |
956 | while ((arg = strdelim(&cp)) && *arg != '\0') { | |
957 | if (strchr(arg, '=') != NULL) | |
958 | fatal("%s line %d: Invalid environment name.", | |
959 | filename, linenum); | |
960 | if (options->num_accept_env >= MAX_ACCEPT_ENV) | |
961 | fatal("%s line %d: too many allow env.", | |
962 | filename, linenum); | |
963 | options->accept_env[options->num_accept_env++] = | |
964 | xstrdup(arg); | |
965 | } | |
966 | break; | |
967 | ||
968 | case sPermitTunnel: | |
969 | intptr = &options->permit_tun; | |
970 | arg = strdelim(&cp); | |
971 | if (!arg || *arg == '\0') | |
972 | fatal("%s line %d: Missing yes/point-to-point/" | |
973 | "ethernet/no argument.", filename, linenum); | |
974 | value = 0; /* silence compiler */ | |
975 | if (strcasecmp(arg, "ethernet") == 0) | |
976 | value = SSH_TUNMODE_ETHERNET; | |
977 | else if (strcasecmp(arg, "point-to-point") == 0) | |
978 | value = SSH_TUNMODE_POINTOPOINT; | |
979 | else if (strcasecmp(arg, "yes") == 0) | |
980 | value = SSH_TUNMODE_YES; | |
981 | else if (strcasecmp(arg, "no") == 0) | |
982 | value = SSH_TUNMODE_NO; | |
983 | else | |
984 | fatal("%s line %d: Bad yes/point-to-point/ethernet/" | |
985 | "no argument: %s", filename, linenum, arg); | |
986 | if (*intptr == -1) | |
987 | *intptr = value; | |
988 | break; | |
989 | ||
990 | case sDeprecated: | |
991 | logit("%s line %d: Deprecated option %s", | |
992 | filename, linenum, arg); | |
993 | while (arg) | |
994 | arg = strdelim(&cp); | |
995 | break; | |
996 | ||
997 | case sUnsupported: | |
998 | logit("%s line %d: Unsupported option %s", | |
999 | filename, linenum, arg); | |
1000 | while (arg) | |
1001 | arg = strdelim(&cp); | |
1002 | break; | |
1003 | ||
1004 | default: | |
1005 | fatal("%s line %d: Missing handler for opcode %s (%d)", | |
1006 | filename, linenum, arg, opcode); | |
1007 | } | |
1008 | if ((arg = strdelim(&cp)) != NULL && *arg != '\0') | |
1009 | fatal("%s line %d: garbage at end of line; \"%.200s\".", | |
1010 | filename, linenum, arg); | |
1011 | return 0; | |
1012 | } | |
1013 | ||
1014 | /* Reads the server configuration file. */ | |
1015 | ||
1016 | void | |
1017 | load_server_config(const char *filename, Buffer *conf) | |
1018 | { | |
1019 | char line[1024], *cp; | |
1020 | FILE *f; | |
1021 | ||
1022 | debug2("%s: filename %s", __func__, filename); | |
1023 | if ((f = fopen(filename, "r")) == NULL) { | |
1024 | perror(filename); | |
1025 | exit(1); | |
1026 | } | |
1027 | buffer_clear(conf); | |
1028 | while (fgets(line, sizeof(line), f)) { | |
1029 | /* | |
1030 | * Trim out comments and strip whitespace | |
1031 | * NB - preserve newlines, they are needed to reproduce | |
1032 | * line numbers later for error messages | |
1033 | */ | |
1034 | if ((cp = strchr(line, '#')) != NULL) | |
1035 | memcpy(cp, "\n", 2); | |
1036 | cp = line + strspn(line, " \t\r"); | |
1037 | ||
1038 | buffer_append(conf, cp, strlen(cp)); | |
1039 | } | |
1040 | buffer_append(conf, "\0", 1); | |
1041 | fclose(f); | |
1042 | debug2("%s: done config len = %d", __func__, buffer_len(conf)); | |
1043 | } | |
1044 | ||
1045 | void | |
1046 | parse_server_config(ServerOptions *options, const char *filename, Buffer *conf) | |
1047 | { | |
1048 | int linenum, bad_options = 0; | |
1049 | char *cp, *obuf, *cbuf; | |
1050 | ||
1051 | debug2("%s: config %s len %d", __func__, filename, buffer_len(conf)); | |
1052 | ||
1053 | obuf = cbuf = xstrdup(buffer_ptr(conf)); | |
1054 | linenum = 1; | |
1055 | while ((cp = strsep(&cbuf, "\n")) != NULL) { | |
1056 | if (process_server_config_line(options, cp, filename, | |
1057 | linenum++) != 0) | |
1058 | bad_options++; | |
1059 | } | |
1060 | xfree(obuf); | |
1061 | if (bad_options > 0) | |
1062 | fatal("%s: terminating, %d bad configuration options", | |
1063 | filename, bad_options); | |
1064 | } |