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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" | |
70791e56 | 13 | RCSID("$OpenBSD: servconf.c,v 1.127 2003/09/01 18:15:50 markus Exp $"); |
3c0ef626 | 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 "tildexpand.h" | |
22 | #include "misc.h" | |
23 | #include "cipher.h" | |
24 | #include "kex.h" | |
25 | #include "mac.h" | |
26 | ||
27 | static void add_listen_addr(ServerOptions *, char *, u_short); | |
28 | static void add_one_listen_addr(ServerOptions *, char *, u_short); | |
29 | ||
30 | /* AF_UNSPEC or AF_INET or AF_INET6 */ | |
31 | extern int IPv4or6; | |
2980ea68 | 32 | /* Use of privilege separation or not */ |
33 | extern int use_privsep; | |
3c0ef626 | 34 | |
35 | /* Initializes the server options to their default values. */ | |
36 | ||
37 | void | |
38 | initialize_server_options(ServerOptions *options) | |
39 | { | |
40 | memset(options, 0, sizeof(*options)); | |
41 | ||
42 | /* Portable-specific options */ | |
70791e56 | 43 | options->use_pam = -1; |
3c0ef626 | 44 | |
45 | /* Standard Options */ | |
46 | options->num_ports = 0; | |
47 | options->ports_from_cmdline = 0; | |
48 | options->listen_addrs = NULL; | |
49 | options->num_host_key_files = 0; | |
50 | options->pid_file = NULL; | |
51 | options->server_key_bits = -1; | |
52 | options->login_grace_time = -1; | |
53 | options->key_regeneration_time = -1; | |
54 | options->permit_root_login = PERMIT_NOT_SET; | |
55 | options->ignore_rhosts = -1; | |
56 | options->ignore_user_known_hosts = -1; | |
57 | options->print_motd = -1; | |
58 | options->print_lastlog = -1; | |
59 | options->x11_forwarding = -1; | |
60 | options->x11_display_offset = -1; | |
e9a17296 | 61 | options->x11_use_localhost = -1; |
3c0ef626 | 62 | options->xauth_location = NULL; |
63 | options->strict_modes = -1; | |
64 | options->keepalives = -1; | |
e9a17296 | 65 | options->log_facility = SYSLOG_FACILITY_NOT_SET; |
66 | options->log_level = SYSLOG_LEVEL_NOT_SET; | |
3c0ef626 | 67 | options->rhosts_rsa_authentication = -1; |
68 | options->hostbased_authentication = -1; | |
69 | options->hostbased_uses_name_from_packet_only = -1; | |
70 | options->rsa_authentication = -1; | |
71 | options->pubkey_authentication = -1; | |
3c0ef626 | 72 | options->kerberos_authentication = -1; |
73 | options->kerberos_or_local_passwd = -1; | |
74 | options->kerberos_ticket_cleanup = -1; | |
88928908 | 75 | #ifdef SESSION_HOOKS |
76 | options->session_hooks_allow = -1; | |
77 | options->session_hooks_startup_cmd = NULL; | |
78 | options->session_hooks_shutdown_cmd = NULL; | |
3c0ef626 | 79 | #endif |
70791e56 | 80 | options->gss_authentication=-1; |
81 | options->gss_keyex=-1; | |
82 | options->gss_use_session_ccache = -1; | |
83 | options->gss_cleanup_creds = -1; | |
3c0ef626 | 84 | options->password_authentication = -1; |
85 | options->kbd_interactive_authentication = -1; | |
86 | options->challenge_response_authentication = -1; | |
87 | options->permit_empty_passwd = -1; | |
e54b3d7c | 88 | options->permit_user_env = -1; |
3c0ef626 | 89 | options->use_login = -1; |
ff2d7a98 | 90 | options->compression = -1; |
3c0ef626 | 91 | options->allow_tcp_forwarding = -1; |
92 | options->num_allow_users = 0; | |
93 | options->num_deny_users = 0; | |
94 | options->num_allow_groups = 0; | |
95 | options->num_deny_groups = 0; | |
96 | options->ciphers = NULL; | |
97 | options->macs = NULL; | |
98 | options->protocol = SSH_PROTO_UNKNOWN; | |
99 | options->gateway_ports = -1; | |
100 | options->num_subsystems = 0; | |
101 | options->max_startups_begin = -1; | |
102 | options->max_startups_rate = -1; | |
103 | options->max_startups = -1; | |
104 | options->banner = NULL; | |
70791e56 | 105 | options->use_dns = -1; |
3c0ef626 | 106 | options->client_alive_interval = -1; |
107 | options->client_alive_count_max = -1; | |
108 | options->authorized_keys_file = NULL; | |
109 | options->authorized_keys_file2 = NULL; | |
2980ea68 | 110 | |
111 | /* Needs to be accessable in many places */ | |
112 | use_privsep = -1; | |
3c0ef626 | 113 | } |
114 | ||
115 | void | |
116 | fill_default_server_options(ServerOptions *options) | |
117 | { | |
118 | /* Portable-specific options */ | |
70791e56 | 119 | if (options->use_pam == -1) |
120 | options->use_pam = 0; | |
3c0ef626 | 121 | |
122 | /* Standard Options */ | |
123 | if (options->protocol == SSH_PROTO_UNKNOWN) | |
124 | options->protocol = SSH_PROTO_1|SSH_PROTO_2; | |
125 | if (options->num_host_key_files == 0) { | |
126 | /* fill default hostkeys for protocols */ | |
127 | if (options->protocol & SSH_PROTO_1) | |
e9a17296 | 128 | options->host_key_files[options->num_host_key_files++] = |
129 | _PATH_HOST_KEY_FILE; | |
130 | if (options->protocol & SSH_PROTO_2) { | |
131 | options->host_key_files[options->num_host_key_files++] = | |
132 | _PATH_HOST_RSA_KEY_FILE; | |
133 | options->host_key_files[options->num_host_key_files++] = | |
134 | _PATH_HOST_DSA_KEY_FILE; | |
135 | } | |
3c0ef626 | 136 | } |
137 | if (options->num_ports == 0) | |
138 | options->ports[options->num_ports++] = SSH_DEFAULT_PORT; | |
139 | if (options->listen_addrs == NULL) | |
140 | add_listen_addr(options, NULL, 0); | |
141 | if (options->pid_file == NULL) | |
142 | options->pid_file = _PATH_SSH_DAEMON_PID_FILE; | |
143 | if (options->server_key_bits == -1) | |
144 | options->server_key_bits = 768; | |
145 | if (options->login_grace_time == -1) | |
e54b3d7c | 146 | options->login_grace_time = 120; |
3c0ef626 | 147 | if (options->key_regeneration_time == -1) |
148 | options->key_regeneration_time = 3600; | |
149 | if (options->permit_root_login == PERMIT_NOT_SET) | |
150 | options->permit_root_login = PERMIT_YES; | |
151 | if (options->ignore_rhosts == -1) | |
152 | options->ignore_rhosts = 1; | |
153 | if (options->ignore_user_known_hosts == -1) | |
154 | options->ignore_user_known_hosts = 0; | |
155 | if (options->print_motd == -1) | |
156 | options->print_motd = 1; | |
157 | if (options->print_lastlog == -1) | |
158 | options->print_lastlog = 1; | |
159 | if (options->x11_forwarding == -1) | |
160 | options->x11_forwarding = 0; | |
161 | if (options->x11_display_offset == -1) | |
162 | options->x11_display_offset = 10; | |
e9a17296 | 163 | if (options->x11_use_localhost == -1) |
164 | options->x11_use_localhost = 1; | |
3c0ef626 | 165 | if (options->xauth_location == NULL) |
166 | options->xauth_location = _PATH_XAUTH; | |
3c0ef626 | 167 | if (options->strict_modes == -1) |
168 | options->strict_modes = 1; | |
169 | if (options->keepalives == -1) | |
170 | options->keepalives = 1; | |
e9a17296 | 171 | if (options->log_facility == SYSLOG_FACILITY_NOT_SET) |
3c0ef626 | 172 | options->log_facility = SYSLOG_FACILITY_AUTH; |
e9a17296 | 173 | if (options->log_level == SYSLOG_LEVEL_NOT_SET) |
3c0ef626 | 174 | options->log_level = SYSLOG_LEVEL_INFO; |
3c0ef626 | 175 | if (options->rhosts_rsa_authentication == -1) |
176 | options->rhosts_rsa_authentication = 0; | |
177 | if (options->hostbased_authentication == -1) | |
178 | options->hostbased_authentication = 0; | |
179 | if (options->hostbased_uses_name_from_packet_only == -1) | |
180 | options->hostbased_uses_name_from_packet_only = 0; | |
181 | if (options->rsa_authentication == -1) | |
182 | options->rsa_authentication = 1; | |
183 | if (options->pubkey_authentication == -1) | |
184 | options->pubkey_authentication = 1; | |
70791e56 | 185 | if (options->kerberos_authentication == -1) |
186 | options->kerberos_authentication = 0; | |
187 | if (options->kerberos_or_local_passwd == -1) | |
188 | options->kerberos_or_local_passwd = 1; | |
189 | if (options->kerberos_ticket_cleanup == -1) | |
190 | options->kerberos_ticket_cleanup = 1; | |
b9a54c29 | 191 | if (options->gss_authentication == -1) |
192 | options->gss_authentication = 1; | |
193 | if (options->gss_keyex == -1) | |
70791e56 | 194 | options->gss_keyex = 1; |
b9a54c29 | 195 | if (options->gss_use_session_ccache == -1) |
196 | options->gss_use_session_ccache = 1; | |
197 | if (options->gss_cleanup_creds == -1) | |
198 | options->gss_cleanup_creds = 1; | |
3c0ef626 | 199 | if (options->password_authentication == -1) |
200 | options->password_authentication = 1; | |
201 | if (options->kbd_interactive_authentication == -1) | |
202 | options->kbd_interactive_authentication = 0; | |
203 | if (options->challenge_response_authentication == -1) | |
204 | options->challenge_response_authentication = 1; | |
205 | if (options->permit_empty_passwd == -1) | |
206 | options->permit_empty_passwd = 0; | |
e54b3d7c | 207 | if (options->permit_user_env == -1) |
208 | options->permit_user_env = 0; | |
3c0ef626 | 209 | if (options->use_login == -1) |
210 | options->use_login = 0; | |
ff2d7a98 | 211 | if (options->compression == -1) |
212 | options->compression = 1; | |
3c0ef626 | 213 | if (options->allow_tcp_forwarding == -1) |
214 | options->allow_tcp_forwarding = 1; | |
215 | if (options->gateway_ports == -1) | |
216 | options->gateway_ports = 0; | |
217 | if (options->max_startups == -1) | |
218 | options->max_startups = 10; | |
219 | if (options->max_startups_rate == -1) | |
220 | options->max_startups_rate = 100; /* 100% */ | |
221 | if (options->max_startups_begin == -1) | |
222 | options->max_startups_begin = options->max_startups; | |
70791e56 | 223 | if (options->use_dns == -1) |
224 | options->use_dns = 1; | |
3c0ef626 | 225 | if (options->client_alive_interval == -1) |
e9a17296 | 226 | options->client_alive_interval = 0; |
3c0ef626 | 227 | if (options->client_alive_count_max == -1) |
228 | options->client_alive_count_max = 3; | |
229 | if (options->authorized_keys_file2 == NULL) { | |
230 | /* authorized_keys_file2 falls back to authorized_keys_file */ | |
231 | if (options->authorized_keys_file != NULL) | |
232 | options->authorized_keys_file2 = options->authorized_keys_file; | |
233 | else | |
234 | options->authorized_keys_file2 = _PATH_SSH_USER_PERMITTED_KEYS2; | |
235 | } | |
236 | if (options->authorized_keys_file == NULL) | |
237 | options->authorized_keys_file = _PATH_SSH_USER_PERMITTED_KEYS; | |
2980ea68 | 238 | |
ff2d7a98 | 239 | /* Turn privilege separation on by default */ |
2980ea68 | 240 | if (use_privsep == -1) |
ff2d7a98 | 241 | use_privsep = 1; |
242 | ||
e54b3d7c | 243 | #ifndef HAVE_MMAP |
ff2d7a98 | 244 | if (use_privsep && options->compression == 1) { |
245 | error("This platform does not support both privilege " | |
246 | "separation and compression"); | |
247 | error("Compression disabled"); | |
248 | options->compression = 0; | |
249 | } | |
250 | #endif | |
251 | ||
3c0ef626 | 252 | } |
253 | ||
254 | /* Keyword tokens. */ | |
255 | typedef enum { | |
256 | sBadOption, /* == unknown option */ | |
257 | /* Portable-specific options */ | |
70791e56 | 258 | sUsePAM, |
3c0ef626 | 259 | /* Standard Options */ |
260 | sPort, sHostKeyFile, sServerKeyBits, sLoginGraceTime, sKeyRegenerationTime, | |
261 | sPermitRootLogin, sLogFacility, sLogLevel, | |
70791e56 | 262 | sRhostsRSAAuthentication, sRSAAuthentication, |
3c0ef626 | 263 | sKerberosAuthentication, sKerberosOrLocalPasswd, sKerberosTicketCleanup, |
70791e56 | 264 | sKerberosTgtPassing, sChallengeResponseAuthentication, |
88928908 | 265 | #ifdef SESSION_HOOKS |
266 | sAllowSessionHooks, sSessionHookStartupCmd, sSessionHookShutdownCmd, | |
3c0ef626 | 267 | #endif |
3c0ef626 | 268 | sPasswordAuthentication, sKbdInteractiveAuthentication, sListenAddress, |
269 | sPrintMotd, sPrintLastLog, sIgnoreRhosts, | |
e9a17296 | 270 | sX11Forwarding, sX11DisplayOffset, sX11UseLocalhost, |
3c0ef626 | 271 | sStrictModes, sEmptyPasswd, sKeepAlives, |
e54b3d7c | 272 | sPermitUserEnvironment, sUseLogin, sAllowTcpForwarding, sCompression, |
3c0ef626 | 273 | sAllowUsers, sDenyUsers, sAllowGroups, sDenyGroups, |
274 | sIgnoreUserKnownHosts, sCiphers, sMacs, sProtocol, sPidFile, | |
275 | sGatewayPorts, sPubkeyAuthentication, sXAuthLocation, sSubsystem, sMaxStartups, | |
70791e56 | 276 | sBanner, sUseDNS, sHostbasedAuthentication, |
e9a17296 | 277 | sHostbasedUsesNameFromPacketOnly, sClientAliveInterval, |
3c0ef626 | 278 | sClientAliveCountMax, sAuthorizedKeysFile, sAuthorizedKeysFile2, |
70791e56 | 279 | sGssAuthentication, sGssKeyEx, sGssUseSessionCredCache, sGssCleanupCreds, |
2980ea68 | 280 | sUsePrivilegeSeparation, |
70791e56 | 281 | sDeprecated, sUnsupported |
3c0ef626 | 282 | } ServerOpCodes; |
283 | ||
284 | /* Textual representation of the tokens. */ | |
285 | static struct { | |
286 | const char *name; | |
287 | ServerOpCodes opcode; | |
288 | } keywords[] = { | |
289 | /* Portable-specific options */ | |
70791e56 | 290 | #ifdef USE_PAM |
291 | { "usepam", sUsePAM }, | |
292 | #else | |
293 | { "usepam", sUnsupported }, | |
294 | #endif | |
295 | { "pamauthenticationviakbdint", sDeprecated }, | |
3c0ef626 | 296 | /* Standard Options */ |
297 | { "port", sPort }, | |
298 | { "hostkey", sHostKeyFile }, | |
299 | { "hostdsakey", sHostKeyFile }, /* alias */ | |
300 | { "pidfile", sPidFile }, | |
301 | { "serverkeybits", sServerKeyBits }, | |
302 | { "logingracetime", sLoginGraceTime }, | |
303 | { "keyregenerationinterval", sKeyRegenerationTime }, | |
304 | { "permitrootlogin", sPermitRootLogin }, | |
305 | { "syslogfacility", sLogFacility }, | |
306 | { "loglevel", sLogLevel }, | |
70791e56 | 307 | { "rhostsauthentication", sDeprecated }, |
3c0ef626 | 308 | { "rhostsrsaauthentication", sRhostsRSAAuthentication }, |
309 | { "hostbasedauthentication", sHostbasedAuthentication }, | |
310 | { "hostbasedusesnamefrompacketonly", sHostbasedUsesNameFromPacketOnly }, | |
311 | { "rsaauthentication", sRSAAuthentication }, | |
312 | { "pubkeyauthentication", sPubkeyAuthentication }, | |
313 | { "dsaauthentication", sPubkeyAuthentication }, /* alias */ | |
70791e56 | 314 | #ifdef KRB5 |
315 | { "kerberosauthentication", sKerberosAuthentication }, | |
316 | { "kerberosorlocalpasswd", sKerberosOrLocalPasswd }, | |
317 | { "kerberosticketcleanup", sKerberosTicketCleanup }, | |
318 | #else | |
319 | { "kerberosauthentication", sUnsupported }, | |
320 | { "kerberosorlocalpasswd", sUnsupported }, | |
321 | { "kerberosticketcleanup", sUnsupported }, | |
322 | #endif | |
323 | { "kerberostgtpassing", sUnsupported }, | |
324 | { "afstokenpassing", sUnsupported }, | |
b9a54c29 | 325 | #ifdef GSSAPI |
326 | { "gssapiauthentication", sGssAuthentication }, | |
327 | { "gssapikeyexchange", sGssKeyEx }, | |
328 | { "gssusesessionccache", sGssUseSessionCredCache }, | |
329 | { "gssapiusesessioncredcache", sGssUseSessionCredCache }, | |
330 | { "gssapicleanupcreds", sGssCleanupCreds }, | |
70791e56 | 331 | #else |
332 | { "gssapiauthentication", sUnsupported }, | |
333 | { "gssapikeyexchange", sUnsupported }, | |
334 | { "gssusesessionccache", sUnsupported }, | |
335 | { "gssapiusesessioncredcache", sUnsupported }, | |
336 | { "gssapicleanupcreds", sUnsupported }, | |
3c0ef626 | 337 | #endif |
88928908 | 338 | #ifdef SESSION_HOOKS |
339 | { "allowsessionhooks", sAllowSessionHooks }, | |
340 | { "sessionhookstartupcmd", sSessionHookStartupCmd }, | |
341 | { "sessionhookshutdowncmd", sSessionHookShutdownCmd }, | |
342 | #endif | |
3c0ef626 | 343 | { "passwordauthentication", sPasswordAuthentication }, |
344 | { "kbdinteractiveauthentication", sKbdInteractiveAuthentication }, | |
345 | { "challengeresponseauthentication", sChallengeResponseAuthentication }, | |
346 | { "skeyauthentication", sChallengeResponseAuthentication }, /* alias */ | |
347 | { "checkmail", sDeprecated }, | |
348 | { "listenaddress", sListenAddress }, | |
349 | { "printmotd", sPrintMotd }, | |
350 | { "printlastlog", sPrintLastLog }, | |
351 | { "ignorerhosts", sIgnoreRhosts }, | |
352 | { "ignoreuserknownhosts", sIgnoreUserKnownHosts }, | |
353 | { "x11forwarding", sX11Forwarding }, | |
354 | { "x11displayoffset", sX11DisplayOffset }, | |
e9a17296 | 355 | { "x11uselocalhost", sX11UseLocalhost }, |
3c0ef626 | 356 | { "xauthlocation", sXAuthLocation }, |
357 | { "strictmodes", sStrictModes }, | |
358 | { "permitemptypasswords", sEmptyPasswd }, | |
e54b3d7c | 359 | { "permituserenvironment", sPermitUserEnvironment }, |
3c0ef626 | 360 | { "uselogin", sUseLogin }, |
ff2d7a98 | 361 | { "compression", sCompression }, |
3c0ef626 | 362 | { "keepalive", sKeepAlives }, |
363 | { "allowtcpforwarding", sAllowTcpForwarding }, | |
364 | { "allowusers", sAllowUsers }, | |
365 | { "denyusers", sDenyUsers }, | |
366 | { "allowgroups", sAllowGroups }, | |
367 | { "denygroups", sDenyGroups }, | |
368 | { "ciphers", sCiphers }, | |
369 | { "macs", sMacs }, | |
370 | { "protocol", sProtocol }, | |
371 | { "gatewayports", sGatewayPorts }, | |
372 | { "subsystem", sSubsystem }, | |
373 | { "maxstartups", sMaxStartups }, | |
374 | { "banner", sBanner }, | |
70791e56 | 375 | { "usedns", sUseDNS }, |
376 | { "verifyreversemapping", sDeprecated }, | |
377 | { "reversemappingcheck", sDeprecated }, | |
3c0ef626 | 378 | { "clientaliveinterval", sClientAliveInterval }, |
379 | { "clientalivecountmax", sClientAliveCountMax }, | |
380 | { "authorizedkeysfile", sAuthorizedKeysFile }, | |
381 | { "authorizedkeysfile2", sAuthorizedKeysFile2 }, | |
2980ea68 | 382 | { "useprivilegeseparation", sUsePrivilegeSeparation}, |
e9a17296 | 383 | { NULL, sBadOption } |
3c0ef626 | 384 | }; |
385 | ||
386 | /* | |
387 | * Returns the number of the token pointed to by cp or sBadOption. | |
388 | */ | |
389 | ||
390 | static ServerOpCodes | |
391 | parse_token(const char *cp, const char *filename, | |
392 | int linenum) | |
393 | { | |
394 | u_int i; | |
395 | ||
396 | for (i = 0; keywords[i].name; i++) | |
397 | if (strcasecmp(cp, keywords[i].name) == 0) | |
398 | return keywords[i].opcode; | |
399 | ||
400 | error("%s: line %d: Bad configuration option: %s", | |
401 | filename, linenum, cp); | |
402 | return sBadOption; | |
403 | } | |
404 | ||
405 | static void | |
406 | add_listen_addr(ServerOptions *options, char *addr, u_short port) | |
407 | { | |
408 | int i; | |
409 | ||
410 | if (options->num_ports == 0) | |
411 | options->ports[options->num_ports++] = SSH_DEFAULT_PORT; | |
412 | if (port == 0) | |
413 | for (i = 0; i < options->num_ports; i++) | |
414 | add_one_listen_addr(options, addr, options->ports[i]); | |
415 | else | |
416 | add_one_listen_addr(options, addr, port); | |
417 | } | |
418 | ||
419 | static void | |
420 | add_one_listen_addr(ServerOptions *options, char *addr, u_short port) | |
421 | { | |
422 | struct addrinfo hints, *ai, *aitop; | |
423 | char strport[NI_MAXSERV]; | |
424 | int gaierr; | |
425 | ||
426 | memset(&hints, 0, sizeof(hints)); | |
427 | hints.ai_family = IPv4or6; | |
428 | hints.ai_socktype = SOCK_STREAM; | |
429 | hints.ai_flags = (addr == NULL) ? AI_PASSIVE : 0; | |
ff2d7a98 | 430 | snprintf(strport, sizeof strport, "%u", port); |
3c0ef626 | 431 | if ((gaierr = getaddrinfo(addr, strport, &hints, &aitop)) != 0) |
432 | fatal("bad addr or host: %s (%s)", | |
433 | addr ? addr : "<NULL>", | |
434 | gai_strerror(gaierr)); | |
435 | for (ai = aitop; ai->ai_next; ai = ai->ai_next) | |
436 | ; | |
437 | ai->ai_next = options->listen_addrs; | |
438 | options->listen_addrs = aitop; | |
439 | } | |
440 | ||
e9a17296 | 441 | int |
442 | process_server_config_line(ServerOptions *options, char *line, | |
443 | const char *filename, int linenum) | |
3c0ef626 | 444 | { |
3c0ef626 | 445 | char *cp, **charptr, *arg, *p; |
ff2d7a98 | 446 | int *intptr, value, i, n; |
3c0ef626 | 447 | ServerOpCodes opcode; |
3c0ef626 | 448 | |
e9a17296 | 449 | cp = line; |
450 | arg = strdelim(&cp); | |
451 | /* Ignore leading whitespace */ | |
452 | if (*arg == '\0') | |
3c0ef626 | 453 | arg = strdelim(&cp); |
e9a17296 | 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 */ | |
70791e56 | 461 | case sUsePAM: |
462 | intptr = &options->use_pam; | |
e9a17296 | 463 | goto parse_flag; |
3c0ef626 | 464 | |
e9a17296 | 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; | |
3c0ef626 | 490 | parse_int: |
e9a17296 | 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; | |
3c0ef626 | 502 | parse_time: |
e9a17296 | 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 || *arg == '\0' || strncmp(arg, "[]", 2) == 0) | |
521 | fatal("%s line %d: missing inet addr.", | |
522 | filename, linenum); | |
523 | if (*arg == '[') { | |
524 | if ((p = strchr(arg, ']')) == NULL) | |
525 | fatal("%s line %d: bad ipv6 inet addr usage.", | |
3c0ef626 | 526 | filename, linenum); |
e9a17296 | 527 | arg++; |
528 | memmove(p, p+1, strlen(p+1)+1); | |
529 | } else if (((p = strchr(arg, ':')) == NULL) || | |
530 | (strchr(p+1, ':') != NULL)) { | |
531 | add_listen_addr(options, arg, 0); | |
3c0ef626 | 532 | break; |
e9a17296 | 533 | } |
534 | if (*p == ':') { | |
535 | u_short port; | |
3c0ef626 | 536 | |
e9a17296 | 537 | p++; |
538 | if (*p == '\0') | |
539 | fatal("%s line %d: bad inet addr:port usage.", | |
3c0ef626 | 540 | filename, linenum); |
e9a17296 | 541 | else { |
542 | *(p-1) = '\0'; | |
543 | if ((port = a2port(p)) == 0) | |
544 | fatal("%s line %d: bad port number.", | |
3c0ef626 | 545 | filename, linenum); |
e9a17296 | 546 | add_listen_addr(options, arg, port); |
3c0ef626 | 547 | } |
e9a17296 | 548 | } else if (*p == '\0') |
549 | add_listen_addr(options, arg, 0); | |
550 | else | |
551 | fatal("%s line %d: bad inet addr usage.", | |
552 | filename, linenum); | |
553 | break; | |
554 | ||
555 | case sHostKeyFile: | |
556 | intptr = &options->num_host_key_files; | |
557 | if (*intptr >= MAX_HOSTKEYS) | |
558 | fatal("%s line %d: too many host keys specified (max %d).", | |
559 | filename, linenum, MAX_HOSTKEYS); | |
560 | charptr = &options->host_key_files[*intptr]; | |
3c0ef626 | 561 | parse_filename: |
e9a17296 | 562 | arg = strdelim(&cp); |
563 | if (!arg || *arg == '\0') | |
564 | fatal("%s line %d: missing file name.", | |
565 | filename, linenum); | |
566 | if (*charptr == NULL) { | |
567 | *charptr = tilde_expand_filename(arg, getuid()); | |
568 | /* increase optional counter */ | |
569 | if (intptr != NULL) | |
570 | *intptr = *intptr + 1; | |
571 | } | |
572 | break; | |
3c0ef626 | 573 | |
e9a17296 | 574 | case sPidFile: |
575 | charptr = &options->pid_file; | |
576 | goto parse_filename; | |
3c0ef626 | 577 | |
e9a17296 | 578 | case sPermitRootLogin: |
579 | intptr = &options->permit_root_login; | |
580 | arg = strdelim(&cp); | |
581 | if (!arg || *arg == '\0') | |
582 | fatal("%s line %d: missing yes/" | |
583 | "without-password/forced-commands-only/no " | |
584 | "argument.", filename, linenum); | |
585 | value = 0; /* silence compiler */ | |
586 | if (strcmp(arg, "without-password") == 0) | |
587 | value = PERMIT_NO_PASSWD; | |
588 | else if (strcmp(arg, "forced-commands-only") == 0) | |
589 | value = PERMIT_FORCED_ONLY; | |
590 | else if (strcmp(arg, "yes") == 0) | |
591 | value = PERMIT_YES; | |
592 | else if (strcmp(arg, "no") == 0) | |
593 | value = PERMIT_NO; | |
594 | else | |
595 | fatal("%s line %d: Bad yes/" | |
596 | "without-password/forced-commands-only/no " | |
597 | "argument: %s", filename, linenum, arg); | |
598 | if (*intptr == -1) | |
599 | *intptr = value; | |
600 | break; | |
601 | ||
602 | case sIgnoreRhosts: | |
603 | intptr = &options->ignore_rhosts; | |
3c0ef626 | 604 | parse_flag: |
e9a17296 | 605 | arg = strdelim(&cp); |
606 | if (!arg || *arg == '\0') | |
607 | fatal("%s line %d: missing yes/no argument.", | |
608 | filename, linenum); | |
609 | value = 0; /* silence compiler */ | |
610 | if (strcmp(arg, "yes") == 0) | |
611 | value = 1; | |
612 | else if (strcmp(arg, "no") == 0) | |
613 | value = 0; | |
614 | else | |
615 | fatal("%s line %d: Bad yes/no argument: %s", | |
616 | filename, linenum, arg); | |
617 | if (*intptr == -1) | |
618 | *intptr = value; | |
619 | break; | |
620 | ||
621 | case sIgnoreUserKnownHosts: | |
622 | intptr = &options->ignore_user_known_hosts; | |
623 | goto parse_flag; | |
624 | ||
e9a17296 | 625 | case sRhostsRSAAuthentication: |
626 | intptr = &options->rhosts_rsa_authentication; | |
627 | goto parse_flag; | |
628 | ||
629 | case sHostbasedAuthentication: | |
630 | intptr = &options->hostbased_authentication; | |
631 | goto parse_flag; | |
632 | ||
633 | case sHostbasedUsesNameFromPacketOnly: | |
634 | intptr = &options->hostbased_uses_name_from_packet_only; | |
635 | goto parse_flag; | |
636 | ||
637 | case sRSAAuthentication: | |
638 | intptr = &options->rsa_authentication; | |
639 | goto parse_flag; | |
640 | ||
641 | case sPubkeyAuthentication: | |
642 | intptr = &options->pubkey_authentication; | |
643 | goto parse_flag; | |
70791e56 | 644 | |
e9a17296 | 645 | case sKerberosAuthentication: |
646 | intptr = &options->kerberos_authentication; | |
647 | goto parse_flag; | |
3c0ef626 | 648 | |
e9a17296 | 649 | case sKerberosOrLocalPasswd: |
650 | intptr = &options->kerberos_or_local_passwd; | |
651 | goto parse_flag; | |
3c0ef626 | 652 | |
e9a17296 | 653 | case sKerberosTicketCleanup: |
654 | intptr = &options->kerberos_ticket_cleanup; | |
655 | goto parse_flag; | |
70791e56 | 656 | |
657 | case sGssAuthentication: | |
658 | intptr = &options->gss_authentication; | |
e9a17296 | 659 | goto parse_flag; |
70791e56 | 660 | |
661 | case sGssKeyEx: | |
662 | intptr = &options->gss_keyex; | |
e9a17296 | 663 | goto parse_flag; |
70791e56 | 664 | |
665 | case sGssUseSessionCredCache: | |
666 | intptr = &options->gss_use_session_ccache; | |
667 | goto parse_flag; | |
668 | ||
669 | case sGssCleanupCreds: | |
670 | intptr = &options->gss_cleanup_creds; | |
671 | goto parse_flag; | |
672 | ||
88928908 | 673 | #ifdef SESSION_HOOKS |
674 | case sAllowSessionHooks: | |
675 | intptr = &options->session_hooks_allow; | |
676 | goto parse_flag; | |
677 | case sSessionHookStartupCmd: | |
678 | case sSessionHookShutdownCmd: | |
679 | arg = strdelim(&cp); | |
680 | if (!arg || *arg == '\0') | |
681 | fatal("%s line %d: empty session hook command", | |
682 | filename, linenum); | |
683 | if (opcode==sSessionHookStartupCmd) | |
684 | options->session_hooks_startup_cmd = strdup(arg); | |
685 | else | |
686 | options->session_hooks_shutdown_cmd = strdup(arg); | |
687 | break; | |
688 | #endif | |
70791e56 | 689 | |
e9a17296 | 690 | case sPasswordAuthentication: |
691 | intptr = &options->password_authentication; | |
692 | goto parse_flag; | |
3c0ef626 | 693 | |
e9a17296 | 694 | case sKbdInteractiveAuthentication: |
695 | intptr = &options->kbd_interactive_authentication; | |
696 | goto parse_flag; | |
3c0ef626 | 697 | |
e9a17296 | 698 | case sChallengeResponseAuthentication: |
699 | intptr = &options->challenge_response_authentication; | |
700 | goto parse_flag; | |
3c0ef626 | 701 | |
e9a17296 | 702 | case sPrintMotd: |
703 | intptr = &options->print_motd; | |
704 | goto parse_flag; | |
3c0ef626 | 705 | |
e9a17296 | 706 | case sPrintLastLog: |
707 | intptr = &options->print_lastlog; | |
708 | goto parse_flag; | |
3c0ef626 | 709 | |
e9a17296 | 710 | case sX11Forwarding: |
711 | intptr = &options->x11_forwarding; | |
712 | goto parse_flag; | |
3c0ef626 | 713 | |
e9a17296 | 714 | case sX11DisplayOffset: |
715 | intptr = &options->x11_display_offset; | |
716 | goto parse_int; | |
3c0ef626 | 717 | |
e9a17296 | 718 | case sX11UseLocalhost: |
719 | intptr = &options->x11_use_localhost; | |
720 | goto parse_flag; | |
3c0ef626 | 721 | |
e9a17296 | 722 | case sXAuthLocation: |
723 | charptr = &options->xauth_location; | |
724 | goto parse_filename; | |
3c0ef626 | 725 | |
e9a17296 | 726 | case sStrictModes: |
727 | intptr = &options->strict_modes; | |
728 | goto parse_flag; | |
3c0ef626 | 729 | |
e9a17296 | 730 | case sKeepAlives: |
731 | intptr = &options->keepalives; | |
732 | goto parse_flag; | |
3c0ef626 | 733 | |
e9a17296 | 734 | case sEmptyPasswd: |
735 | intptr = &options->permit_empty_passwd; | |
736 | goto parse_flag; | |
3c0ef626 | 737 | |
e54b3d7c | 738 | case sPermitUserEnvironment: |
739 | intptr = &options->permit_user_env; | |
740 | goto parse_flag; | |
741 | ||
e9a17296 | 742 | case sUseLogin: |
743 | intptr = &options->use_login; | |
744 | goto parse_flag; | |
3c0ef626 | 745 | |
ff2d7a98 | 746 | case sCompression: |
747 | intptr = &options->compression; | |
748 | goto parse_flag; | |
749 | ||
e9a17296 | 750 | case sGatewayPorts: |
751 | intptr = &options->gateway_ports; | |
752 | goto parse_flag; | |
3c0ef626 | 753 | |
70791e56 | 754 | case sUseDNS: |
755 | intptr = &options->use_dns; | |
e9a17296 | 756 | goto parse_flag; |
3c0ef626 | 757 | |
e9a17296 | 758 | case sLogFacility: |
759 | intptr = (int *) &options->log_facility; | |
760 | arg = strdelim(&cp); | |
761 | value = log_facility_number(arg); | |
762 | if (value == SYSLOG_FACILITY_NOT_SET) | |
763 | fatal("%.200s line %d: unsupported log facility '%s'", | |
764 | filename, linenum, arg ? arg : "<NONE>"); | |
765 | if (*intptr == -1) | |
766 | *intptr = (SyslogFacility) value; | |
767 | break; | |
768 | ||
769 | case sLogLevel: | |
770 | intptr = (int *) &options->log_level; | |
771 | arg = strdelim(&cp); | |
772 | value = log_level_number(arg); | |
773 | if (value == SYSLOG_LEVEL_NOT_SET) | |
774 | fatal("%.200s line %d: unsupported log level '%s'", | |
775 | filename, linenum, arg ? arg : "<NONE>"); | |
776 | if (*intptr == -1) | |
777 | *intptr = (LogLevel) value; | |
778 | break; | |
779 | ||
780 | case sAllowTcpForwarding: | |
781 | intptr = &options->allow_tcp_forwarding; | |
782 | goto parse_flag; | |
783 | ||
2980ea68 | 784 | case sUsePrivilegeSeparation: |
785 | intptr = &use_privsep; | |
786 | goto parse_flag; | |
787 | ||
e9a17296 | 788 | case sAllowUsers: |
789 | while ((arg = strdelim(&cp)) && *arg != '\0') { | |
790 | if (options->num_allow_users >= MAX_ALLOW_USERS) | |
791 | fatal("%s line %d: too many allow users.", | |
792 | filename, linenum); | |
ff2d7a98 | 793 | options->allow_users[options->num_allow_users++] = |
794 | xstrdup(arg); | |
e9a17296 | 795 | } |
796 | break; | |
3c0ef626 | 797 | |
e9a17296 | 798 | case sDenyUsers: |
799 | while ((arg = strdelim(&cp)) && *arg != '\0') { | |
800 | if (options->num_deny_users >= MAX_DENY_USERS) | |
801 | fatal( "%s line %d: too many deny users.", | |
802 | filename, linenum); | |
ff2d7a98 | 803 | options->deny_users[options->num_deny_users++] = |
804 | xstrdup(arg); | |
e9a17296 | 805 | } |
806 | break; | |
3c0ef626 | 807 | |
e9a17296 | 808 | case sAllowGroups: |
809 | while ((arg = strdelim(&cp)) && *arg != '\0') { | |
810 | if (options->num_allow_groups >= MAX_ALLOW_GROUPS) | |
811 | fatal("%s line %d: too many allow groups.", | |
812 | filename, linenum); | |
ff2d7a98 | 813 | options->allow_groups[options->num_allow_groups++] = |
814 | xstrdup(arg); | |
e9a17296 | 815 | } |
816 | break; | |
3c0ef626 | 817 | |
e9a17296 | 818 | case sDenyGroups: |
819 | while ((arg = strdelim(&cp)) && *arg != '\0') { | |
820 | if (options->num_deny_groups >= MAX_DENY_GROUPS) | |
821 | fatal("%s line %d: too many deny groups.", | |
822 | filename, linenum); | |
823 | options->deny_groups[options->num_deny_groups++] = xstrdup(arg); | |
824 | } | |
825 | break; | |
826 | ||
827 | case sCiphers: | |
828 | arg = strdelim(&cp); | |
829 | if (!arg || *arg == '\0') | |
830 | fatal("%s line %d: Missing argument.", filename, linenum); | |
831 | if (!ciphers_valid(arg)) | |
832 | fatal("%s line %d: Bad SSH2 cipher spec '%s'.", | |
833 | filename, linenum, arg ? arg : "<NONE>"); | |
834 | if (options->ciphers == NULL) | |
835 | options->ciphers = xstrdup(arg); | |
836 | break; | |
837 | ||
838 | case sMacs: | |
839 | arg = strdelim(&cp); | |
840 | if (!arg || *arg == '\0') | |
841 | fatal("%s line %d: Missing argument.", filename, linenum); | |
842 | if (!mac_valid(arg)) | |
843 | fatal("%s line %d: Bad SSH2 mac spec '%s'.", | |
844 | filename, linenum, arg ? arg : "<NONE>"); | |
845 | if (options->macs == NULL) | |
846 | options->macs = xstrdup(arg); | |
847 | break; | |
848 | ||
849 | case sProtocol: | |
850 | intptr = &options->protocol; | |
851 | arg = strdelim(&cp); | |
852 | if (!arg || *arg == '\0') | |
853 | fatal("%s line %d: Missing argument.", filename, linenum); | |
854 | value = proto_spec(arg); | |
855 | if (value == SSH_PROTO_UNKNOWN) | |
856 | fatal("%s line %d: Bad protocol spec '%s'.", | |
857 | filename, linenum, arg ? arg : "<NONE>"); | |
858 | if (*intptr == SSH_PROTO_UNKNOWN) | |
859 | *intptr = value; | |
860 | break; | |
861 | ||
862 | case sSubsystem: | |
863 | if (options->num_subsystems >= MAX_SUBSYSTEMS) { | |
864 | fatal("%s line %d: too many subsystems defined.", | |
865 | filename, linenum); | |
866 | } | |
867 | arg = strdelim(&cp); | |
868 | if (!arg || *arg == '\0') | |
869 | fatal("%s line %d: Missing subsystem name.", | |
870 | filename, linenum); | |
871 | for (i = 0; i < options->num_subsystems; i++) | |
872 | if (strcmp(arg, options->subsystem_name[i]) == 0) | |
873 | fatal("%s line %d: Subsystem '%s' already defined.", | |
874 | filename, linenum, arg); | |
875 | options->subsystem_name[options->num_subsystems] = xstrdup(arg); | |
876 | arg = strdelim(&cp); | |
877 | if (!arg || *arg == '\0') | |
878 | fatal("%s line %d: Missing subsystem command.", | |
879 | filename, linenum); | |
880 | options->subsystem_command[options->num_subsystems] = xstrdup(arg); | |
881 | options->num_subsystems++; | |
882 | break; | |
883 | ||
884 | case sMaxStartups: | |
885 | arg = strdelim(&cp); | |
886 | if (!arg || *arg == '\0') | |
887 | fatal("%s line %d: Missing MaxStartups spec.", | |
888 | filename, linenum); | |
889 | if ((n = sscanf(arg, "%d:%d:%d", | |
890 | &options->max_startups_begin, | |
891 | &options->max_startups_rate, | |
892 | &options->max_startups)) == 3) { | |
893 | if (options->max_startups_begin > | |
894 | options->max_startups || | |
895 | options->max_startups_rate > 100 || | |
896 | options->max_startups_rate < 1) | |
3c0ef626 | 897 | fatal("%s line %d: Illegal MaxStartups spec.", |
898 | filename, linenum); | |
e9a17296 | 899 | } else if (n != 1) |
900 | fatal("%s line %d: Illegal MaxStartups spec.", | |
901 | filename, linenum); | |
902 | else | |
903 | options->max_startups = options->max_startups_begin; | |
904 | break; | |
905 | ||
906 | case sBanner: | |
907 | charptr = &options->banner; | |
908 | goto parse_filename; | |
909 | /* | |
910 | * These options can contain %X options expanded at | |
911 | * connect time, so that you can specify paths like: | |
912 | * | |
913 | * AuthorizedKeysFile /etc/ssh_keys/%u | |
914 | */ | |
915 | case sAuthorizedKeysFile: | |
916 | case sAuthorizedKeysFile2: | |
917 | charptr = (opcode == sAuthorizedKeysFile ) ? | |
918 | &options->authorized_keys_file : | |
919 | &options->authorized_keys_file2; | |
920 | goto parse_filename; | |
921 | ||
922 | case sClientAliveInterval: | |
923 | intptr = &options->client_alive_interval; | |
924 | goto parse_time; | |
925 | ||
926 | case sClientAliveCountMax: | |
927 | intptr = &options->client_alive_count_max; | |
928 | goto parse_int; | |
929 | ||
930 | case sDeprecated: | |
70791e56 | 931 | logit("%s line %d: Deprecated option %s", |
932 | filename, linenum, arg); | |
933 | while (arg) | |
934 | arg = strdelim(&cp); | |
935 | break; | |
936 | ||
937 | case sUnsupported: | |
938 | logit("%s line %d: Unsupported option %s", | |
e9a17296 | 939 | filename, linenum, arg); |
940 | while (arg) | |
941 | arg = strdelim(&cp); | |
942 | break; | |
943 | ||
944 | default: | |
945 | fatal("%s line %d: Missing handler for opcode %s (%d)", | |
946 | filename, linenum, arg, opcode); | |
947 | } | |
948 | if ((arg = strdelim(&cp)) != NULL && *arg != '\0') | |
949 | fatal("%s line %d: garbage at end of line; \"%.200s\".", | |
950 | filename, linenum, arg); | |
951 | return 0; | |
952 | } | |
3c0ef626 | 953 | |
e9a17296 | 954 | /* Reads the server configuration file. */ |
3c0ef626 | 955 | |
e9a17296 | 956 | void |
957 | read_server_config(ServerOptions *options, const char *filename) | |
958 | { | |
ff2d7a98 | 959 | int linenum, bad_options = 0; |
e9a17296 | 960 | char line[1024]; |
ff2d7a98 | 961 | FILE *f; |
e9a17296 | 962 | |
1c14df9e | 963 | debug2("read_server_config: filename %s", filename); |
e9a17296 | 964 | f = fopen(filename, "r"); |
965 | if (!f) { | |
966 | perror(filename); | |
967 | exit(1); | |
968 | } | |
969 | linenum = 0; | |
970 | while (fgets(line, sizeof(line), f)) { | |
971 | /* Update line number counter. */ | |
972 | linenum++; | |
973 | if (process_server_config_line(options, line, filename, linenum) != 0) | |
974 | bad_options++; | |
3c0ef626 | 975 | } |
976 | fclose(f); | |
977 | if (bad_options > 0) | |
978 | fatal("%s: terminating, %d bad configuration options", | |
979 | filename, bad_options); | |
980 | } |