]>
Commit | Line | Data |
---|---|---|
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" | |
416fd2a8 | 13 | RCSID("$OpenBSD: servconf.c,v 1.130 2003/12/23 16:12:10 jakob 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; | |
416fd2a8 | 64 | options->tcp_keep_alive = -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 |
416fd2a8 | 80 | options->kerberos_get_afs_token = -1; |
70791e56 | 81 | options->gss_authentication=-1; |
82 | options->gss_keyex=-1; | |
83 | options->gss_use_session_ccache = -1; | |
84 | options->gss_cleanup_creds = -1; | |
3c0ef626 | 85 | options->password_authentication = -1; |
86 | options->kbd_interactive_authentication = -1; | |
87 | options->challenge_response_authentication = -1; | |
88 | options->permit_empty_passwd = -1; | |
e54b3d7c | 89 | options->permit_user_env = -1; |
3c0ef626 | 90 | options->use_login = -1; |
ff2d7a98 | 91 | options->compression = -1; |
3c0ef626 | 92 | options->allow_tcp_forwarding = -1; |
93 | options->num_allow_users = 0; | |
94 | options->num_deny_users = 0; | |
95 | options->num_allow_groups = 0; | |
96 | options->num_deny_groups = 0; | |
97 | options->ciphers = NULL; | |
98 | options->macs = NULL; | |
99 | options->protocol = SSH_PROTO_UNKNOWN; | |
100 | options->gateway_ports = -1; | |
101 | options->num_subsystems = 0; | |
102 | options->max_startups_begin = -1; | |
103 | options->max_startups_rate = -1; | |
104 | options->max_startups = -1; | |
105 | options->banner = NULL; | |
70791e56 | 106 | options->use_dns = -1; |
3c0ef626 | 107 | options->client_alive_interval = -1; |
108 | options->client_alive_count_max = -1; | |
109 | options->authorized_keys_file = NULL; | |
110 | options->authorized_keys_file2 = NULL; | |
2980ea68 | 111 | |
112 | /* Needs to be accessable in many places */ | |
113 | use_privsep = -1; | |
3c0ef626 | 114 | } |
115 | ||
116 | void | |
117 | fill_default_server_options(ServerOptions *options) | |
118 | { | |
119 | /* Portable-specific options */ | |
70791e56 | 120 | if (options->use_pam == -1) |
121 | options->use_pam = 0; | |
3c0ef626 | 122 | |
123 | /* Standard Options */ | |
124 | if (options->protocol == SSH_PROTO_UNKNOWN) | |
125 | options->protocol = SSH_PROTO_1|SSH_PROTO_2; | |
126 | if (options->num_host_key_files == 0) { | |
127 | /* fill default hostkeys for protocols */ | |
128 | if (options->protocol & SSH_PROTO_1) | |
e9a17296 | 129 | options->host_key_files[options->num_host_key_files++] = |
130 | _PATH_HOST_KEY_FILE; | |
131 | if (options->protocol & SSH_PROTO_2) { | |
132 | options->host_key_files[options->num_host_key_files++] = | |
133 | _PATH_HOST_RSA_KEY_FILE; | |
134 | options->host_key_files[options->num_host_key_files++] = | |
135 | _PATH_HOST_DSA_KEY_FILE; | |
136 | } | |
3c0ef626 | 137 | } |
138 | if (options->num_ports == 0) | |
139 | options->ports[options->num_ports++] = SSH_DEFAULT_PORT; | |
140 | if (options->listen_addrs == NULL) | |
141 | add_listen_addr(options, NULL, 0); | |
142 | if (options->pid_file == NULL) | |
143 | options->pid_file = _PATH_SSH_DAEMON_PID_FILE; | |
144 | if (options->server_key_bits == -1) | |
145 | options->server_key_bits = 768; | |
146 | if (options->login_grace_time == -1) | |
e54b3d7c | 147 | options->login_grace_time = 120; |
3c0ef626 | 148 | if (options->key_regeneration_time == -1) |
149 | options->key_regeneration_time = 3600; | |
150 | if (options->permit_root_login == PERMIT_NOT_SET) | |
151 | options->permit_root_login = PERMIT_YES; | |
152 | if (options->ignore_rhosts == -1) | |
153 | options->ignore_rhosts = 1; | |
154 | if (options->ignore_user_known_hosts == -1) | |
155 | options->ignore_user_known_hosts = 0; | |
156 | if (options->print_motd == -1) | |
157 | options->print_motd = 1; | |
158 | if (options->print_lastlog == -1) | |
159 | options->print_lastlog = 1; | |
160 | if (options->x11_forwarding == -1) | |
161 | options->x11_forwarding = 0; | |
162 | if (options->x11_display_offset == -1) | |
163 | options->x11_display_offset = 10; | |
e9a17296 | 164 | if (options->x11_use_localhost == -1) |
165 | options->x11_use_localhost = 1; | |
3c0ef626 | 166 | if (options->xauth_location == NULL) |
167 | options->xauth_location = _PATH_XAUTH; | |
3c0ef626 | 168 | if (options->strict_modes == -1) |
169 | options->strict_modes = 1; | |
416fd2a8 | 170 | if (options->tcp_keep_alive == -1) |
171 | options->tcp_keep_alive = 1; | |
e9a17296 | 172 | if (options->log_facility == SYSLOG_FACILITY_NOT_SET) |
3c0ef626 | 173 | options->log_facility = SYSLOG_FACILITY_AUTH; |
e9a17296 | 174 | if (options->log_level == SYSLOG_LEVEL_NOT_SET) |
3c0ef626 | 175 | options->log_level = SYSLOG_LEVEL_INFO; |
3c0ef626 | 176 | if (options->rhosts_rsa_authentication == -1) |
177 | options->rhosts_rsa_authentication = 0; | |
178 | if (options->hostbased_authentication == -1) | |
179 | options->hostbased_authentication = 0; | |
180 | if (options->hostbased_uses_name_from_packet_only == -1) | |
181 | options->hostbased_uses_name_from_packet_only = 0; | |
182 | if (options->rsa_authentication == -1) | |
183 | options->rsa_authentication = 1; | |
184 | if (options->pubkey_authentication == -1) | |
185 | options->pubkey_authentication = 1; | |
70791e56 | 186 | if (options->kerberos_authentication == -1) |
187 | options->kerberos_authentication = 0; | |
188 | if (options->kerberos_or_local_passwd == -1) | |
189 | options->kerberos_or_local_passwd = 1; | |
190 | if (options->kerberos_ticket_cleanup == -1) | |
191 | options->kerberos_ticket_cleanup = 1; | |
416fd2a8 | 192 | if (options->kerberos_get_afs_token == -1) |
193 | options->kerberos_get_afs_token = 0; | |
b9a54c29 | 194 | if (options->gss_authentication == -1) |
195 | options->gss_authentication = 1; | |
196 | if (options->gss_keyex == -1) | |
70791e56 | 197 | options->gss_keyex = 1; |
b9a54c29 | 198 | if (options->gss_use_session_ccache == -1) |
199 | options->gss_use_session_ccache = 1; | |
200 | if (options->gss_cleanup_creds == -1) | |
201 | options->gss_cleanup_creds = 1; | |
3c0ef626 | 202 | if (options->password_authentication == -1) |
203 | options->password_authentication = 1; | |
204 | if (options->kbd_interactive_authentication == -1) | |
205 | options->kbd_interactive_authentication = 0; | |
206 | if (options->challenge_response_authentication == -1) | |
207 | options->challenge_response_authentication = 1; | |
208 | if (options->permit_empty_passwd == -1) | |
209 | options->permit_empty_passwd = 0; | |
e54b3d7c | 210 | if (options->permit_user_env == -1) |
211 | options->permit_user_env = 0; | |
3c0ef626 | 212 | if (options->use_login == -1) |
213 | options->use_login = 0; | |
ff2d7a98 | 214 | if (options->compression == -1) |
215 | options->compression = 1; | |
3c0ef626 | 216 | if (options->allow_tcp_forwarding == -1) |
217 | options->allow_tcp_forwarding = 1; | |
218 | if (options->gateway_ports == -1) | |
219 | options->gateway_ports = 0; | |
220 | if (options->max_startups == -1) | |
221 | options->max_startups = 10; | |
222 | if (options->max_startups_rate == -1) | |
223 | options->max_startups_rate = 100; /* 100% */ | |
224 | if (options->max_startups_begin == -1) | |
225 | options->max_startups_begin = options->max_startups; | |
70791e56 | 226 | if (options->use_dns == -1) |
227 | options->use_dns = 1; | |
3c0ef626 | 228 | if (options->client_alive_interval == -1) |
e9a17296 | 229 | options->client_alive_interval = 0; |
3c0ef626 | 230 | if (options->client_alive_count_max == -1) |
231 | options->client_alive_count_max = 3; | |
232 | if (options->authorized_keys_file2 == NULL) { | |
233 | /* authorized_keys_file2 falls back to authorized_keys_file */ | |
234 | if (options->authorized_keys_file != NULL) | |
235 | options->authorized_keys_file2 = options->authorized_keys_file; | |
236 | else | |
237 | options->authorized_keys_file2 = _PATH_SSH_USER_PERMITTED_KEYS2; | |
238 | } | |
239 | if (options->authorized_keys_file == NULL) | |
240 | options->authorized_keys_file = _PATH_SSH_USER_PERMITTED_KEYS; | |
2980ea68 | 241 | |
ff2d7a98 | 242 | /* Turn privilege separation on by default */ |
2980ea68 | 243 | if (use_privsep == -1) |
ff2d7a98 | 244 | use_privsep = 1; |
245 | ||
e54b3d7c | 246 | #ifndef HAVE_MMAP |
ff2d7a98 | 247 | if (use_privsep && options->compression == 1) { |
248 | error("This platform does not support both privilege " | |
249 | "separation and compression"); | |
250 | error("Compression disabled"); | |
251 | options->compression = 0; | |
252 | } | |
253 | #endif | |
254 | ||
3c0ef626 | 255 | } |
256 | ||
257 | /* Keyword tokens. */ | |
258 | typedef enum { | |
259 | sBadOption, /* == unknown option */ | |
260 | /* Portable-specific options */ | |
70791e56 | 261 | sUsePAM, |
3c0ef626 | 262 | /* Standard Options */ |
263 | sPort, sHostKeyFile, sServerKeyBits, sLoginGraceTime, sKeyRegenerationTime, | |
264 | sPermitRootLogin, sLogFacility, sLogLevel, | |
70791e56 | 265 | sRhostsRSAAuthentication, sRSAAuthentication, |
3c0ef626 | 266 | sKerberosAuthentication, sKerberosOrLocalPasswd, sKerberosTicketCleanup, |
416fd2a8 | 267 | sKerberosGetAFSToken, |
70791e56 | 268 | sKerberosTgtPassing, sChallengeResponseAuthentication, |
88928908 | 269 | #ifdef SESSION_HOOKS |
270 | sAllowSessionHooks, sSessionHookStartupCmd, sSessionHookShutdownCmd, | |
3c0ef626 | 271 | #endif |
3c0ef626 | 272 | sPasswordAuthentication, sKbdInteractiveAuthentication, sListenAddress, |
273 | sPrintMotd, sPrintLastLog, sIgnoreRhosts, | |
e9a17296 | 274 | sX11Forwarding, sX11DisplayOffset, sX11UseLocalhost, |
416fd2a8 | 275 | sStrictModes, sEmptyPasswd, sTCPKeepAlive, |
e54b3d7c | 276 | sPermitUserEnvironment, sUseLogin, sAllowTcpForwarding, sCompression, |
3c0ef626 | 277 | sAllowUsers, sDenyUsers, sAllowGroups, sDenyGroups, |
278 | sIgnoreUserKnownHosts, sCiphers, sMacs, sProtocol, sPidFile, | |
279 | sGatewayPorts, sPubkeyAuthentication, sXAuthLocation, sSubsystem, sMaxStartups, | |
70791e56 | 280 | sBanner, sUseDNS, sHostbasedAuthentication, |
e9a17296 | 281 | sHostbasedUsesNameFromPacketOnly, sClientAliveInterval, |
3c0ef626 | 282 | sClientAliveCountMax, sAuthorizedKeysFile, sAuthorizedKeysFile2, |
70791e56 | 283 | sGssAuthentication, sGssKeyEx, sGssUseSessionCredCache, sGssCleanupCreds, |
2980ea68 | 284 | sUsePrivilegeSeparation, |
70791e56 | 285 | sDeprecated, sUnsupported |
3c0ef626 | 286 | } ServerOpCodes; |
287 | ||
288 | /* Textual representation of the tokens. */ | |
289 | static struct { | |
290 | const char *name; | |
291 | ServerOpCodes opcode; | |
292 | } keywords[] = { | |
293 | /* Portable-specific options */ | |
70791e56 | 294 | #ifdef USE_PAM |
295 | { "usepam", sUsePAM }, | |
296 | #else | |
297 | { "usepam", sUnsupported }, | |
298 | #endif | |
299 | { "pamauthenticationviakbdint", sDeprecated }, | |
3c0ef626 | 300 | /* Standard Options */ |
301 | { "port", sPort }, | |
302 | { "hostkey", sHostKeyFile }, | |
303 | { "hostdsakey", sHostKeyFile }, /* alias */ | |
304 | { "pidfile", sPidFile }, | |
305 | { "serverkeybits", sServerKeyBits }, | |
306 | { "logingracetime", sLoginGraceTime }, | |
307 | { "keyregenerationinterval", sKeyRegenerationTime }, | |
308 | { "permitrootlogin", sPermitRootLogin }, | |
309 | { "syslogfacility", sLogFacility }, | |
310 | { "loglevel", sLogLevel }, | |
70791e56 | 311 | { "rhostsauthentication", sDeprecated }, |
3c0ef626 | 312 | { "rhostsrsaauthentication", sRhostsRSAAuthentication }, |
313 | { "hostbasedauthentication", sHostbasedAuthentication }, | |
314 | { "hostbasedusesnamefrompacketonly", sHostbasedUsesNameFromPacketOnly }, | |
315 | { "rsaauthentication", sRSAAuthentication }, | |
316 | { "pubkeyauthentication", sPubkeyAuthentication }, | |
317 | { "dsaauthentication", sPubkeyAuthentication }, /* alias */ | |
70791e56 | 318 | #ifdef KRB5 |
319 | { "kerberosauthentication", sKerberosAuthentication }, | |
320 | { "kerberosorlocalpasswd", sKerberosOrLocalPasswd }, | |
321 | { "kerberosticketcleanup", sKerberosTicketCleanup }, | |
416fd2a8 | 322 | #ifdef USE_AFS |
323 | { "kerberosgetafstoken", sKerberosGetAFSToken }, | |
324 | #else | |
325 | { "kerberosgetafstoken", sUnsupported }, | |
326 | #endif | |
70791e56 | 327 | #else |
328 | { "kerberosauthentication", sUnsupported }, | |
329 | { "kerberosorlocalpasswd", sUnsupported }, | |
330 | { "kerberosticketcleanup", sUnsupported }, | |
416fd2a8 | 331 | { "kerberosgetafstoken", sUnsupported }, |
70791e56 | 332 | #endif |
333 | { "kerberostgtpassing", sUnsupported }, | |
334 | { "afstokenpassing", sUnsupported }, | |
b9a54c29 | 335 | #ifdef GSSAPI |
336 | { "gssapiauthentication", sGssAuthentication }, | |
337 | { "gssapikeyexchange", sGssKeyEx }, | |
338 | { "gssusesessionccache", sGssUseSessionCredCache }, | |
339 | { "gssapiusesessioncredcache", sGssUseSessionCredCache }, | |
416fd2a8 | 340 | { "gssapicleanupcredentials", sGssCleanupCreds }, |
70791e56 | 341 | #else |
342 | { "gssapiauthentication", sUnsupported }, | |
343 | { "gssapikeyexchange", sUnsupported }, | |
344 | { "gssusesessionccache", sUnsupported }, | |
345 | { "gssapiusesessioncredcache", sUnsupported }, | |
416fd2a8 | 346 | { "gssapicleanupcredentials", sUnsupported }, |
3c0ef626 | 347 | #endif |
88928908 | 348 | #ifdef SESSION_HOOKS |
349 | { "allowsessionhooks", sAllowSessionHooks }, | |
350 | { "sessionhookstartupcmd", sSessionHookStartupCmd }, | |
351 | { "sessionhookshutdowncmd", sSessionHookShutdownCmd }, | |
352 | #endif | |
3c0ef626 | 353 | { "passwordauthentication", sPasswordAuthentication }, |
354 | { "kbdinteractiveauthentication", sKbdInteractiveAuthentication }, | |
355 | { "challengeresponseauthentication", sChallengeResponseAuthentication }, | |
356 | { "skeyauthentication", sChallengeResponseAuthentication }, /* alias */ | |
357 | { "checkmail", sDeprecated }, | |
358 | { "listenaddress", sListenAddress }, | |
359 | { "printmotd", sPrintMotd }, | |
360 | { "printlastlog", sPrintLastLog }, | |
361 | { "ignorerhosts", sIgnoreRhosts }, | |
362 | { "ignoreuserknownhosts", sIgnoreUserKnownHosts }, | |
363 | { "x11forwarding", sX11Forwarding }, | |
364 | { "x11displayoffset", sX11DisplayOffset }, | |
e9a17296 | 365 | { "x11uselocalhost", sX11UseLocalhost }, |
3c0ef626 | 366 | { "xauthlocation", sXAuthLocation }, |
367 | { "strictmodes", sStrictModes }, | |
368 | { "permitemptypasswords", sEmptyPasswd }, | |
e54b3d7c | 369 | { "permituserenvironment", sPermitUserEnvironment }, |
3c0ef626 | 370 | { "uselogin", sUseLogin }, |
ff2d7a98 | 371 | { "compression", sCompression }, |
416fd2a8 | 372 | { "tcpkeepalive", sTCPKeepAlive }, |
373 | { "keepalive", sTCPKeepAlive }, /* obsolete alias */ | |
3c0ef626 | 374 | { "allowtcpforwarding", sAllowTcpForwarding }, |
375 | { "allowusers", sAllowUsers }, | |
376 | { "denyusers", sDenyUsers }, | |
377 | { "allowgroups", sAllowGroups }, | |
378 | { "denygroups", sDenyGroups }, | |
379 | { "ciphers", sCiphers }, | |
380 | { "macs", sMacs }, | |
381 | { "protocol", sProtocol }, | |
382 | { "gatewayports", sGatewayPorts }, | |
383 | { "subsystem", sSubsystem }, | |
384 | { "maxstartups", sMaxStartups }, | |
385 | { "banner", sBanner }, | |
70791e56 | 386 | { "usedns", sUseDNS }, |
387 | { "verifyreversemapping", sDeprecated }, | |
388 | { "reversemappingcheck", sDeprecated }, | |
3c0ef626 | 389 | { "clientaliveinterval", sClientAliveInterval }, |
390 | { "clientalivecountmax", sClientAliveCountMax }, | |
391 | { "authorizedkeysfile", sAuthorizedKeysFile }, | |
392 | { "authorizedkeysfile2", sAuthorizedKeysFile2 }, | |
2980ea68 | 393 | { "useprivilegeseparation", sUsePrivilegeSeparation}, |
e9a17296 | 394 | { NULL, sBadOption } |
3c0ef626 | 395 | }; |
396 | ||
397 | /* | |
398 | * Returns the number of the token pointed to by cp or sBadOption. | |
399 | */ | |
400 | ||
401 | static ServerOpCodes | |
402 | parse_token(const char *cp, const char *filename, | |
403 | int linenum) | |
404 | { | |
405 | u_int i; | |
406 | ||
407 | for (i = 0; keywords[i].name; i++) | |
408 | if (strcasecmp(cp, keywords[i].name) == 0) | |
409 | return keywords[i].opcode; | |
410 | ||
411 | error("%s: line %d: Bad configuration option: %s", | |
412 | filename, linenum, cp); | |
413 | return sBadOption; | |
414 | } | |
415 | ||
416 | static void | |
417 | add_listen_addr(ServerOptions *options, char *addr, u_short port) | |
418 | { | |
419 | int i; | |
420 | ||
421 | if (options->num_ports == 0) | |
422 | options->ports[options->num_ports++] = SSH_DEFAULT_PORT; | |
423 | if (port == 0) | |
424 | for (i = 0; i < options->num_ports; i++) | |
425 | add_one_listen_addr(options, addr, options->ports[i]); | |
426 | else | |
427 | add_one_listen_addr(options, addr, port); | |
428 | } | |
429 | ||
430 | static void | |
431 | add_one_listen_addr(ServerOptions *options, char *addr, u_short port) | |
432 | { | |
433 | struct addrinfo hints, *ai, *aitop; | |
434 | char strport[NI_MAXSERV]; | |
435 | int gaierr; | |
436 | ||
437 | memset(&hints, 0, sizeof(hints)); | |
438 | hints.ai_family = IPv4or6; | |
439 | hints.ai_socktype = SOCK_STREAM; | |
440 | hints.ai_flags = (addr == NULL) ? AI_PASSIVE : 0; | |
ff2d7a98 | 441 | snprintf(strport, sizeof strport, "%u", port); |
3c0ef626 | 442 | if ((gaierr = getaddrinfo(addr, strport, &hints, &aitop)) != 0) |
443 | fatal("bad addr or host: %s (%s)", | |
444 | addr ? addr : "<NULL>", | |
445 | gai_strerror(gaierr)); | |
446 | for (ai = aitop; ai->ai_next; ai = ai->ai_next) | |
447 | ; | |
448 | ai->ai_next = options->listen_addrs; | |
449 | options->listen_addrs = aitop; | |
450 | } | |
451 | ||
e9a17296 | 452 | int |
453 | process_server_config_line(ServerOptions *options, char *line, | |
454 | const char *filename, int linenum) | |
3c0ef626 | 455 | { |
3c0ef626 | 456 | char *cp, **charptr, *arg, *p; |
ff2d7a98 | 457 | int *intptr, value, i, n; |
3c0ef626 | 458 | ServerOpCodes opcode; |
3c0ef626 | 459 | |
e9a17296 | 460 | cp = line; |
461 | arg = strdelim(&cp); | |
462 | /* Ignore leading whitespace */ | |
463 | if (*arg == '\0') | |
3c0ef626 | 464 | arg = strdelim(&cp); |
e9a17296 | 465 | if (!arg || !*arg || *arg == '#') |
466 | return 0; | |
467 | intptr = NULL; | |
468 | charptr = NULL; | |
469 | opcode = parse_token(arg, filename, linenum); | |
470 | switch (opcode) { | |
471 | /* Portable-specific options */ | |
70791e56 | 472 | case sUsePAM: |
473 | intptr = &options->use_pam; | |
e9a17296 | 474 | goto parse_flag; |
3c0ef626 | 475 | |
e9a17296 | 476 | /* Standard Options */ |
477 | case sBadOption: | |
478 | return -1; | |
479 | case sPort: | |
480 | /* ignore ports from configfile if cmdline specifies ports */ | |
481 | if (options->ports_from_cmdline) | |
482 | return 0; | |
483 | if (options->listen_addrs != NULL) | |
484 | fatal("%s line %d: ports must be specified before " | |
485 | "ListenAddress.", filename, linenum); | |
486 | if (options->num_ports >= MAX_PORTS) | |
487 | fatal("%s line %d: too many ports.", | |
488 | filename, linenum); | |
489 | arg = strdelim(&cp); | |
490 | if (!arg || *arg == '\0') | |
491 | fatal("%s line %d: missing port number.", | |
492 | filename, linenum); | |
493 | options->ports[options->num_ports++] = a2port(arg); | |
494 | if (options->ports[options->num_ports-1] == 0) | |
495 | fatal("%s line %d: Badly formatted port number.", | |
496 | filename, linenum); | |
497 | break; | |
498 | ||
499 | case sServerKeyBits: | |
500 | intptr = &options->server_key_bits; | |
3c0ef626 | 501 | parse_int: |
e9a17296 | 502 | arg = strdelim(&cp); |
503 | if (!arg || *arg == '\0') | |
504 | fatal("%s line %d: missing integer value.", | |
505 | filename, linenum); | |
506 | value = atoi(arg); | |
507 | if (*intptr == -1) | |
508 | *intptr = value; | |
509 | break; | |
510 | ||
511 | case sLoginGraceTime: | |
512 | intptr = &options->login_grace_time; | |
3c0ef626 | 513 | parse_time: |
e9a17296 | 514 | arg = strdelim(&cp); |
515 | if (!arg || *arg == '\0') | |
516 | fatal("%s line %d: missing time value.", | |
517 | filename, linenum); | |
518 | if ((value = convtime(arg)) == -1) | |
519 | fatal("%s line %d: invalid time value.", | |
520 | filename, linenum); | |
521 | if (*intptr == -1) | |
522 | *intptr = value; | |
523 | break; | |
524 | ||
525 | case sKeyRegenerationTime: | |
526 | intptr = &options->key_regeneration_time; | |
527 | goto parse_time; | |
528 | ||
529 | case sListenAddress: | |
530 | arg = strdelim(&cp); | |
531 | if (!arg || *arg == '\0' || strncmp(arg, "[]", 2) == 0) | |
532 | fatal("%s line %d: missing inet addr.", | |
533 | filename, linenum); | |
534 | if (*arg == '[') { | |
535 | if ((p = strchr(arg, ']')) == NULL) | |
536 | fatal("%s line %d: bad ipv6 inet addr usage.", | |
3c0ef626 | 537 | filename, linenum); |
e9a17296 | 538 | arg++; |
539 | memmove(p, p+1, strlen(p+1)+1); | |
540 | } else if (((p = strchr(arg, ':')) == NULL) || | |
541 | (strchr(p+1, ':') != NULL)) { | |
542 | add_listen_addr(options, arg, 0); | |
3c0ef626 | 543 | break; |
e9a17296 | 544 | } |
545 | if (*p == ':') { | |
546 | u_short port; | |
3c0ef626 | 547 | |
e9a17296 | 548 | p++; |
549 | if (*p == '\0') | |
550 | fatal("%s line %d: bad inet addr:port usage.", | |
3c0ef626 | 551 | filename, linenum); |
e9a17296 | 552 | else { |
553 | *(p-1) = '\0'; | |
554 | if ((port = a2port(p)) == 0) | |
555 | fatal("%s line %d: bad port number.", | |
3c0ef626 | 556 | filename, linenum); |
e9a17296 | 557 | add_listen_addr(options, arg, port); |
3c0ef626 | 558 | } |
e9a17296 | 559 | } else if (*p == '\0') |
560 | add_listen_addr(options, arg, 0); | |
561 | else | |
562 | fatal("%s line %d: bad inet addr usage.", | |
563 | filename, linenum); | |
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]; | |
3c0ef626 | 572 | parse_filename: |
e9a17296 | 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; | |
3c0ef626 | 584 | |
e9a17296 | 585 | case sPidFile: |
586 | charptr = &options->pid_file; | |
587 | goto parse_filename; | |
3c0ef626 | 588 | |
e9a17296 | 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; | |
3c0ef626 | 615 | parse_flag: |
e9a17296 | 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 | ||
e9a17296 | 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; | |
70791e56 | 655 | |
e9a17296 | 656 | case sKerberosAuthentication: |
657 | intptr = &options->kerberos_authentication; | |
658 | goto parse_flag; | |
3c0ef626 | 659 | |
e9a17296 | 660 | case sKerberosOrLocalPasswd: |
661 | intptr = &options->kerberos_or_local_passwd; | |
662 | goto parse_flag; | |
3c0ef626 | 663 | |
e9a17296 | 664 | case sKerberosTicketCleanup: |
665 | intptr = &options->kerberos_ticket_cleanup; | |
666 | goto parse_flag; | |
70791e56 | 667 | |
416fd2a8 | 668 | case sKerberosGetAFSToken: |
669 | intptr = &options->kerberos_get_afs_token; | |
670 | goto parse_flag; | |
671 | ||
70791e56 | 672 | case sGssAuthentication: |
673 | intptr = &options->gss_authentication; | |
e9a17296 | 674 | goto parse_flag; |
70791e56 | 675 | |
676 | case sGssKeyEx: | |
677 | intptr = &options->gss_keyex; | |
e9a17296 | 678 | goto parse_flag; |
70791e56 | 679 | |
680 | case sGssUseSessionCredCache: | |
681 | intptr = &options->gss_use_session_ccache; | |
682 | goto parse_flag; | |
683 | ||
684 | case sGssCleanupCreds: | |
685 | intptr = &options->gss_cleanup_creds; | |
686 | goto parse_flag; | |
687 | ||
88928908 | 688 | #ifdef SESSION_HOOKS |
689 | case sAllowSessionHooks: | |
690 | intptr = &options->session_hooks_allow; | |
691 | goto parse_flag; | |
692 | case sSessionHookStartupCmd: | |
693 | case sSessionHookShutdownCmd: | |
694 | arg = strdelim(&cp); | |
695 | if (!arg || *arg == '\0') | |
696 | fatal("%s line %d: empty session hook command", | |
697 | filename, linenum); | |
698 | if (opcode==sSessionHookStartupCmd) | |
699 | options->session_hooks_startup_cmd = strdup(arg); | |
700 | else | |
701 | options->session_hooks_shutdown_cmd = strdup(arg); | |
702 | break; | |
703 | #endif | |
70791e56 | 704 | |
e9a17296 | 705 | case sPasswordAuthentication: |
706 | intptr = &options->password_authentication; | |
707 | goto parse_flag; | |
3c0ef626 | 708 | |
e9a17296 | 709 | case sKbdInteractiveAuthentication: |
710 | intptr = &options->kbd_interactive_authentication; | |
711 | goto parse_flag; | |
3c0ef626 | 712 | |
e9a17296 | 713 | case sChallengeResponseAuthentication: |
714 | intptr = &options->challenge_response_authentication; | |
715 | goto parse_flag; | |
3c0ef626 | 716 | |
e9a17296 | 717 | case sPrintMotd: |
718 | intptr = &options->print_motd; | |
719 | goto parse_flag; | |
3c0ef626 | 720 | |
e9a17296 | 721 | case sPrintLastLog: |
722 | intptr = &options->print_lastlog; | |
723 | goto parse_flag; | |
3c0ef626 | 724 | |
e9a17296 | 725 | case sX11Forwarding: |
726 | intptr = &options->x11_forwarding; | |
727 | goto parse_flag; | |
3c0ef626 | 728 | |
e9a17296 | 729 | case sX11DisplayOffset: |
730 | intptr = &options->x11_display_offset; | |
731 | goto parse_int; | |
3c0ef626 | 732 | |
e9a17296 | 733 | case sX11UseLocalhost: |
734 | intptr = &options->x11_use_localhost; | |
735 | goto parse_flag; | |
3c0ef626 | 736 | |
e9a17296 | 737 | case sXAuthLocation: |
738 | charptr = &options->xauth_location; | |
739 | goto parse_filename; | |
3c0ef626 | 740 | |
e9a17296 | 741 | case sStrictModes: |
742 | intptr = &options->strict_modes; | |
743 | goto parse_flag; | |
3c0ef626 | 744 | |
416fd2a8 | 745 | case sTCPKeepAlive: |
746 | intptr = &options->tcp_keep_alive; | |
e9a17296 | 747 | goto parse_flag; |
3c0ef626 | 748 | |
e9a17296 | 749 | case sEmptyPasswd: |
750 | intptr = &options->permit_empty_passwd; | |
751 | goto parse_flag; | |
3c0ef626 | 752 | |
e54b3d7c | 753 | case sPermitUserEnvironment: |
754 | intptr = &options->permit_user_env; | |
755 | goto parse_flag; | |
756 | ||
e9a17296 | 757 | case sUseLogin: |
758 | intptr = &options->use_login; | |
759 | goto parse_flag; | |
3c0ef626 | 760 | |
ff2d7a98 | 761 | case sCompression: |
762 | intptr = &options->compression; | |
763 | goto parse_flag; | |
764 | ||
e9a17296 | 765 | case sGatewayPorts: |
766 | intptr = &options->gateway_ports; | |
767 | goto parse_flag; | |
3c0ef626 | 768 | |
70791e56 | 769 | case sUseDNS: |
770 | intptr = &options->use_dns; | |
e9a17296 | 771 | goto parse_flag; |
3c0ef626 | 772 | |
e9a17296 | 773 | case sLogFacility: |
774 | intptr = (int *) &options->log_facility; | |
775 | arg = strdelim(&cp); | |
776 | value = log_facility_number(arg); | |
777 | if (value == SYSLOG_FACILITY_NOT_SET) | |
778 | fatal("%.200s line %d: unsupported log facility '%s'", | |
779 | filename, linenum, arg ? arg : "<NONE>"); | |
780 | if (*intptr == -1) | |
781 | *intptr = (SyslogFacility) value; | |
782 | break; | |
783 | ||
784 | case sLogLevel: | |
785 | intptr = (int *) &options->log_level; | |
786 | arg = strdelim(&cp); | |
787 | value = log_level_number(arg); | |
788 | if (value == SYSLOG_LEVEL_NOT_SET) | |
789 | fatal("%.200s line %d: unsupported log level '%s'", | |
790 | filename, linenum, arg ? arg : "<NONE>"); | |
791 | if (*intptr == -1) | |
792 | *intptr = (LogLevel) value; | |
793 | break; | |
794 | ||
795 | case sAllowTcpForwarding: | |
796 | intptr = &options->allow_tcp_forwarding; | |
797 | goto parse_flag; | |
798 | ||
2980ea68 | 799 | case sUsePrivilegeSeparation: |
800 | intptr = &use_privsep; | |
801 | goto parse_flag; | |
802 | ||
e9a17296 | 803 | case sAllowUsers: |
804 | while ((arg = strdelim(&cp)) && *arg != '\0') { | |
805 | if (options->num_allow_users >= MAX_ALLOW_USERS) | |
806 | fatal("%s line %d: too many allow users.", | |
807 | filename, linenum); | |
ff2d7a98 | 808 | options->allow_users[options->num_allow_users++] = |
809 | xstrdup(arg); | |
e9a17296 | 810 | } |
811 | break; | |
3c0ef626 | 812 | |
e9a17296 | 813 | case sDenyUsers: |
814 | while ((arg = strdelim(&cp)) && *arg != '\0') { | |
815 | if (options->num_deny_users >= MAX_DENY_USERS) | |
816 | fatal( "%s line %d: too many deny users.", | |
817 | filename, linenum); | |
ff2d7a98 | 818 | options->deny_users[options->num_deny_users++] = |
819 | xstrdup(arg); | |
e9a17296 | 820 | } |
821 | break; | |
3c0ef626 | 822 | |
e9a17296 | 823 | case sAllowGroups: |
824 | while ((arg = strdelim(&cp)) && *arg != '\0') { | |
825 | if (options->num_allow_groups >= MAX_ALLOW_GROUPS) | |
826 | fatal("%s line %d: too many allow groups.", | |
827 | filename, linenum); | |
ff2d7a98 | 828 | options->allow_groups[options->num_allow_groups++] = |
829 | xstrdup(arg); | |
e9a17296 | 830 | } |
831 | break; | |
3c0ef626 | 832 | |
e9a17296 | 833 | case sDenyGroups: |
834 | while ((arg = strdelim(&cp)) && *arg != '\0') { | |
835 | if (options->num_deny_groups >= MAX_DENY_GROUPS) | |
836 | fatal("%s line %d: too many deny groups.", | |
837 | filename, linenum); | |
838 | options->deny_groups[options->num_deny_groups++] = xstrdup(arg); | |
839 | } | |
840 | break; | |
841 | ||
842 | case sCiphers: | |
843 | arg = strdelim(&cp); | |
844 | if (!arg || *arg == '\0') | |
845 | fatal("%s line %d: Missing argument.", filename, linenum); | |
846 | if (!ciphers_valid(arg)) | |
847 | fatal("%s line %d: Bad SSH2 cipher spec '%s'.", | |
848 | filename, linenum, arg ? arg : "<NONE>"); | |
849 | if (options->ciphers == NULL) | |
850 | options->ciphers = xstrdup(arg); | |
851 | break; | |
852 | ||
853 | case sMacs: | |
854 | arg = strdelim(&cp); | |
855 | if (!arg || *arg == '\0') | |
856 | fatal("%s line %d: Missing argument.", filename, linenum); | |
857 | if (!mac_valid(arg)) | |
858 | fatal("%s line %d: Bad SSH2 mac spec '%s'.", | |
859 | filename, linenum, arg ? arg : "<NONE>"); | |
860 | if (options->macs == NULL) | |
861 | options->macs = xstrdup(arg); | |
862 | break; | |
863 | ||
864 | case sProtocol: | |
865 | intptr = &options->protocol; | |
866 | arg = strdelim(&cp); | |
867 | if (!arg || *arg == '\0') | |
868 | fatal("%s line %d: Missing argument.", filename, linenum); | |
869 | value = proto_spec(arg); | |
870 | if (value == SSH_PROTO_UNKNOWN) | |
871 | fatal("%s line %d: Bad protocol spec '%s'.", | |
872 | filename, linenum, arg ? arg : "<NONE>"); | |
873 | if (*intptr == SSH_PROTO_UNKNOWN) | |
874 | *intptr = value; | |
875 | break; | |
876 | ||
877 | case sSubsystem: | |
878 | if (options->num_subsystems >= MAX_SUBSYSTEMS) { | |
879 | fatal("%s line %d: too many subsystems defined.", | |
880 | filename, linenum); | |
881 | } | |
882 | arg = strdelim(&cp); | |
883 | if (!arg || *arg == '\0') | |
884 | fatal("%s line %d: Missing subsystem name.", | |
885 | filename, linenum); | |
886 | for (i = 0; i < options->num_subsystems; i++) | |
887 | if (strcmp(arg, options->subsystem_name[i]) == 0) | |
888 | fatal("%s line %d: Subsystem '%s' already defined.", | |
889 | filename, linenum, arg); | |
890 | options->subsystem_name[options->num_subsystems] = xstrdup(arg); | |
891 | arg = strdelim(&cp); | |
892 | if (!arg || *arg == '\0') | |
893 | fatal("%s line %d: Missing subsystem command.", | |
894 | filename, linenum); | |
895 | options->subsystem_command[options->num_subsystems] = xstrdup(arg); | |
896 | options->num_subsystems++; | |
897 | break; | |
898 | ||
899 | case sMaxStartups: | |
900 | arg = strdelim(&cp); | |
901 | if (!arg || *arg == '\0') | |
902 | fatal("%s line %d: Missing MaxStartups spec.", | |
903 | filename, linenum); | |
904 | if ((n = sscanf(arg, "%d:%d:%d", | |
905 | &options->max_startups_begin, | |
906 | &options->max_startups_rate, | |
907 | &options->max_startups)) == 3) { | |
908 | if (options->max_startups_begin > | |
909 | options->max_startups || | |
910 | options->max_startups_rate > 100 || | |
911 | options->max_startups_rate < 1) | |
3c0ef626 | 912 | fatal("%s line %d: Illegal MaxStartups spec.", |
913 | filename, linenum); | |
e9a17296 | 914 | } else if (n != 1) |
915 | fatal("%s line %d: Illegal MaxStartups spec.", | |
916 | filename, linenum); | |
917 | else | |
918 | options->max_startups = options->max_startups_begin; | |
919 | break; | |
920 | ||
921 | case sBanner: | |
922 | charptr = &options->banner; | |
923 | goto parse_filename; | |
924 | /* | |
925 | * These options can contain %X options expanded at | |
926 | * connect time, so that you can specify paths like: | |
927 | * | |
928 | * AuthorizedKeysFile /etc/ssh_keys/%u | |
929 | */ | |
930 | case sAuthorizedKeysFile: | |
931 | case sAuthorizedKeysFile2: | |
932 | charptr = (opcode == sAuthorizedKeysFile ) ? | |
933 | &options->authorized_keys_file : | |
934 | &options->authorized_keys_file2; | |
935 | goto parse_filename; | |
936 | ||
937 | case sClientAliveInterval: | |
938 | intptr = &options->client_alive_interval; | |
939 | goto parse_time; | |
940 | ||
941 | case sClientAliveCountMax: | |
942 | intptr = &options->client_alive_count_max; | |
943 | goto parse_int; | |
944 | ||
945 | case sDeprecated: | |
70791e56 | 946 | logit("%s line %d: Deprecated option %s", |
947 | filename, linenum, arg); | |
948 | while (arg) | |
949 | arg = strdelim(&cp); | |
950 | break; | |
951 | ||
952 | case sUnsupported: | |
953 | logit("%s line %d: Unsupported option %s", | |
e9a17296 | 954 | filename, linenum, arg); |
955 | while (arg) | |
956 | arg = strdelim(&cp); | |
957 | break; | |
958 | ||
959 | default: | |
960 | fatal("%s line %d: Missing handler for opcode %s (%d)", | |
961 | filename, linenum, arg, opcode); | |
962 | } | |
963 | if ((arg = strdelim(&cp)) != NULL && *arg != '\0') | |
964 | fatal("%s line %d: garbage at end of line; \"%.200s\".", | |
965 | filename, linenum, arg); | |
966 | return 0; | |
967 | } | |
3c0ef626 | 968 | |
e9a17296 | 969 | /* Reads the server configuration file. */ |
3c0ef626 | 970 | |
e9a17296 | 971 | void |
972 | read_server_config(ServerOptions *options, const char *filename) | |
973 | { | |
ff2d7a98 | 974 | int linenum, bad_options = 0; |
e9a17296 | 975 | char line[1024]; |
ff2d7a98 | 976 | FILE *f; |
e9a17296 | 977 | |
1c14df9e | 978 | debug2("read_server_config: filename %s", filename); |
e9a17296 | 979 | f = fopen(filename, "r"); |
980 | if (!f) { | |
981 | perror(filename); | |
982 | exit(1); | |
983 | } | |
984 | linenum = 0; | |
985 | while (fgets(line, sizeof(line), f)) { | |
986 | /* Update line number counter. */ | |
987 | linenum++; | |
988 | if (process_server_config_line(options, line, filename, linenum) != 0) | |
989 | bad_options++; | |
3c0ef626 | 990 | } |
991 | fclose(f); | |
992 | if (bad_options > 0) | |
993 | fatal("%s: terminating, %d bad configuration options", | |
994 | filename, bad_options); | |
995 | } |