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8efc0c15 | 1 | /* |
5260325f | 2 | * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland |
3 | * All rights reserved | |
6ae2364d | 4 | * |
bcbf86ec | 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". | |
5260325f | 10 | */ |
8efc0c15 | 11 | |
12 | #include "includes.h" | |
636f76ca | 13 | RCSID("$OpenBSD: servconf.c,v 1.111 2002/06/20 23:05:55 markus Exp $"); |
42f11eb2 | 14 | |
12928e80 | 15 | #if defined(KRB4) |
42f11eb2 | 16 | #include <krb.h> |
17 | #endif | |
12928e80 | 18 | #if defined(KRB5) |
19 | #ifdef HEIMDAL | |
20 | #include <krb.h> | |
21 | #else | |
22 | /* Bodge - but then, so is using the kerberos IV KEYFILE to get a Kerberos V | |
23 | * keytab */ | |
24 | #define KEYFILE "/etc/krb5.keytab" | |
25 | #endif | |
26 | #endif | |
83f46621 | 27 | #ifdef AFS |
28 | #include <kafs.h> | |
29 | #endif | |
8efc0c15 | 30 | |
31 | #include "ssh.h" | |
42f11eb2 | 32 | #include "log.h" |
8efc0c15 | 33 | #include "servconf.h" |
34 | #include "xmalloc.h" | |
a8be9f80 | 35 | #include "compat.h" |
42f11eb2 | 36 | #include "pathnames.h" |
37 | #include "tildexpand.h" | |
38 | #include "misc.h" | |
39 | #include "cipher.h" | |
b2552997 | 40 | #include "kex.h" |
41 | #include "mac.h" | |
42f11eb2 | 42 | |
396c147e | 43 | static void add_listen_addr(ServerOptions *, char *, u_short); |
44 | static void add_one_listen_addr(ServerOptions *, char *, u_short); | |
48e671d5 | 45 | |
42f11eb2 | 46 | /* AF_UNSPEC or AF_INET or AF_INET6 */ |
47 | extern int IPv4or6; | |
1853d1ef | 48 | /* Use of privilege separation or not */ |
49 | extern int use_privsep; | |
42f11eb2 | 50 | |
8efc0c15 | 51 | /* Initializes the server options to their default values. */ |
52 | ||
6ae2364d | 53 | void |
5260325f | 54 | initialize_server_options(ServerOptions *options) |
8efc0c15 | 55 | { |
5260325f | 56 | memset(options, 0, sizeof(*options)); |
e15895cd | 57 | |
58 | /* Portable-specific options */ | |
59 | options->pam_authentication_via_kbd_int = -1; | |
60 | ||
61 | /* Standard Options */ | |
48e671d5 | 62 | options->num_ports = 0; |
63 | options->ports_from_cmdline = 0; | |
64 | options->listen_addrs = NULL; | |
fa08c86b | 65 | options->num_host_key_files = 0; |
0fbe8c74 | 66 | options->pid_file = NULL; |
5260325f | 67 | options->server_key_bits = -1; |
68 | options->login_grace_time = -1; | |
69 | options->key_regeneration_time = -1; | |
15853e93 | 70 | options->permit_root_login = PERMIT_NOT_SET; |
5260325f | 71 | options->ignore_rhosts = -1; |
72 | options->ignore_user_known_hosts = -1; | |
73 | options->print_motd = -1; | |
4f4648f9 | 74 | options->print_lastlog = -1; |
5260325f | 75 | options->x11_forwarding = -1; |
76 | options->x11_display_offset = -1; | |
e6e573bd | 77 | options->x11_use_localhost = -1; |
fa649821 | 78 | options->xauth_location = NULL; |
5260325f | 79 | options->strict_modes = -1; |
80 | options->keepalives = -1; | |
5eaf8578 | 81 | options->log_facility = SYSLOG_FACILITY_NOT_SET; |
82 | options->log_level = SYSLOG_LEVEL_NOT_SET; | |
5260325f | 83 | options->rhosts_authentication = -1; |
84 | options->rhosts_rsa_authentication = -1; | |
8002af61 | 85 | options->hostbased_authentication = -1; |
86 | options->hostbased_uses_name_from_packet_only = -1; | |
5260325f | 87 | options->rsa_authentication = -1; |
fa08c86b | 88 | options->pubkey_authentication = -1; |
ced49be2 | 89 | #if defined(KRB4) || defined(KRB5) |
5260325f | 90 | options->kerberos_authentication = -1; |
91 | options->kerberos_or_local_passwd = -1; | |
92 | options->kerberos_ticket_cleanup = -1; | |
8efc0c15 | 93 | #endif |
ced49be2 | 94 | #if defined(AFS) || defined(KRB5) |
5260325f | 95 | options->kerberos_tgt_passing = -1; |
ced49be2 | 96 | #endif |
97 | #ifdef AFS | |
5260325f | 98 | options->afs_token_passing = -1; |
8efc0c15 | 99 | #endif |
5260325f | 100 | options->password_authentication = -1; |
94ec8c6b | 101 | options->kbd_interactive_authentication = -1; |
5ba55ada | 102 | options->challenge_response_authentication = -1; |
5260325f | 103 | options->permit_empty_passwd = -1; |
104 | options->use_login = -1; | |
636f76ca | 105 | options->compression = -1; |
33de75a3 | 106 | options->allow_tcp_forwarding = -1; |
5260325f | 107 | options->num_allow_users = 0; |
108 | options->num_deny_users = 0; | |
109 | options->num_allow_groups = 0; | |
110 | options->num_deny_groups = 0; | |
a8be9f80 | 111 | options->ciphers = NULL; |
b2552997 | 112 | options->macs = NULL; |
a8be9f80 | 113 | options->protocol = SSH_PROTO_UNKNOWN; |
1d1ffb87 | 114 | options->gateway_ports = -1; |
38c295d6 | 115 | options->num_subsystems = 0; |
c345cf9d | 116 | options->max_startups_begin = -1; |
117 | options->max_startups_rate = -1; | |
089fbbd2 | 118 | options->max_startups = -1; |
eea39c02 | 119 | options->banner = NULL; |
bf4c5edc | 120 | options->verify_reverse_mapping = -1; |
3ffc6336 | 121 | options->client_alive_interval = -1; |
122 | options->client_alive_count_max = -1; | |
c8445989 | 123 | options->authorized_keys_file = NULL; |
124 | options->authorized_keys_file2 = NULL; | |
1853d1ef | 125 | |
1853d1ef | 126 | /* Needs to be accessable in many places */ |
127 | use_privsep = -1; | |
8efc0c15 | 128 | } |
129 | ||
6ae2364d | 130 | void |
5260325f | 131 | fill_default_server_options(ServerOptions *options) |
8efc0c15 | 132 | { |
e15895cd | 133 | /* Portable-specific options */ |
134 | if (options->pam_authentication_via_kbd_int == -1) | |
135 | options->pam_authentication_via_kbd_int = 0; | |
136 | ||
137 | /* Standard Options */ | |
fa08c86b | 138 | if (options->protocol == SSH_PROTO_UNKNOWN) |
139 | options->protocol = SSH_PROTO_1|SSH_PROTO_2; | |
140 | if (options->num_host_key_files == 0) { | |
141 | /* fill default hostkeys for protocols */ | |
142 | if (options->protocol & SSH_PROTO_1) | |
0f84fe37 | 143 | options->host_key_files[options->num_host_key_files++] = |
144 | _PATH_HOST_KEY_FILE; | |
145 | if (options->protocol & SSH_PROTO_2) { | |
146 | options->host_key_files[options->num_host_key_files++] = | |
147 | _PATH_HOST_RSA_KEY_FILE; | |
148 | options->host_key_files[options->num_host_key_files++] = | |
149 | _PATH_HOST_DSA_KEY_FILE; | |
150 | } | |
fa08c86b | 151 | } |
48e671d5 | 152 | if (options->num_ports == 0) |
153 | options->ports[options->num_ports++] = SSH_DEFAULT_PORT; | |
154 | if (options->listen_addrs == NULL) | |
2d2a2c65 | 155 | add_listen_addr(options, NULL, 0); |
0fbe8c74 | 156 | if (options->pid_file == NULL) |
42f11eb2 | 157 | options->pid_file = _PATH_SSH_DAEMON_PID_FILE; |
5260325f | 158 | if (options->server_key_bits == -1) |
159 | options->server_key_bits = 768; | |
160 | if (options->login_grace_time == -1) | |
161 | options->login_grace_time = 600; | |
162 | if (options->key_regeneration_time == -1) | |
163 | options->key_regeneration_time = 3600; | |
15853e93 | 164 | if (options->permit_root_login == PERMIT_NOT_SET) |
165 | options->permit_root_login = PERMIT_YES; | |
5260325f | 166 | if (options->ignore_rhosts == -1) |
c8d54615 | 167 | options->ignore_rhosts = 1; |
5260325f | 168 | if (options->ignore_user_known_hosts == -1) |
169 | options->ignore_user_known_hosts = 0; | |
5260325f | 170 | if (options->print_motd == -1) |
171 | options->print_motd = 1; | |
4f4648f9 | 172 | if (options->print_lastlog == -1) |
173 | options->print_lastlog = 1; | |
5260325f | 174 | if (options->x11_forwarding == -1) |
c8d54615 | 175 | options->x11_forwarding = 0; |
5260325f | 176 | if (options->x11_display_offset == -1) |
c8d54615 | 177 | options->x11_display_offset = 10; |
e6e573bd | 178 | if (options->x11_use_localhost == -1) |
179 | options->x11_use_localhost = 1; | |
fa649821 | 180 | if (options->xauth_location == NULL) |
fd9ede94 | 181 | options->xauth_location = _PATH_XAUTH; |
5260325f | 182 | if (options->strict_modes == -1) |
183 | options->strict_modes = 1; | |
184 | if (options->keepalives == -1) | |
185 | options->keepalives = 1; | |
5eaf8578 | 186 | if (options->log_facility == SYSLOG_FACILITY_NOT_SET) |
5260325f | 187 | options->log_facility = SYSLOG_FACILITY_AUTH; |
5eaf8578 | 188 | if (options->log_level == SYSLOG_LEVEL_NOT_SET) |
59c97189 | 189 | options->log_level = SYSLOG_LEVEL_INFO; |
5260325f | 190 | if (options->rhosts_authentication == -1) |
191 | options->rhosts_authentication = 0; | |
192 | if (options->rhosts_rsa_authentication == -1) | |
c8d54615 | 193 | options->rhosts_rsa_authentication = 0; |
8002af61 | 194 | if (options->hostbased_authentication == -1) |
195 | options->hostbased_authentication = 0; | |
196 | if (options->hostbased_uses_name_from_packet_only == -1) | |
197 | options->hostbased_uses_name_from_packet_only = 0; | |
5260325f | 198 | if (options->rsa_authentication == -1) |
199 | options->rsa_authentication = 1; | |
fa08c86b | 200 | if (options->pubkey_authentication == -1) |
201 | options->pubkey_authentication = 1; | |
ced49be2 | 202 | #if defined(KRB4) || defined(KRB5) |
5260325f | 203 | if (options->kerberos_authentication == -1) |
eadc806d | 204 | options->kerberos_authentication = 0; |
5260325f | 205 | if (options->kerberos_or_local_passwd == -1) |
206 | options->kerberos_or_local_passwd = 1; | |
207 | if (options->kerberos_ticket_cleanup == -1) | |
208 | options->kerberos_ticket_cleanup = 1; | |
ced49be2 | 209 | #endif |
210 | #if defined(AFS) || defined(KRB5) | |
5260325f | 211 | if (options->kerberos_tgt_passing == -1) |
212 | options->kerberos_tgt_passing = 0; | |
ced49be2 | 213 | #endif |
184eed6a | 214 | #ifdef AFS |
5260325f | 215 | if (options->afs_token_passing == -1) |
1c3454e7 | 216 | options->afs_token_passing = 0; |
ced49be2 | 217 | #endif |
5260325f | 218 | if (options->password_authentication == -1) |
219 | options->password_authentication = 1; | |
94ec8c6b | 220 | if (options->kbd_interactive_authentication == -1) |
221 | options->kbd_interactive_authentication = 0; | |
5ba55ada | 222 | if (options->challenge_response_authentication == -1) |
223 | options->challenge_response_authentication = 1; | |
5260325f | 224 | if (options->permit_empty_passwd == -1) |
c8d54615 | 225 | options->permit_empty_passwd = 0; |
5260325f | 226 | if (options->use_login == -1) |
227 | options->use_login = 0; | |
636f76ca | 228 | if (options->compression == -1) |
229 | options->compression = 1; | |
33de75a3 | 230 | if (options->allow_tcp_forwarding == -1) |
231 | options->allow_tcp_forwarding = 1; | |
1d1ffb87 | 232 | if (options->gateway_ports == -1) |
233 | options->gateway_ports = 0; | |
089fbbd2 | 234 | if (options->max_startups == -1) |
235 | options->max_startups = 10; | |
c345cf9d | 236 | if (options->max_startups_rate == -1) |
237 | options->max_startups_rate = 100; /* 100% */ | |
238 | if (options->max_startups_begin == -1) | |
239 | options->max_startups_begin = options->max_startups; | |
bf4c5edc | 240 | if (options->verify_reverse_mapping == -1) |
241 | options->verify_reverse_mapping = 0; | |
3ffc6336 | 242 | if (options->client_alive_interval == -1) |
184eed6a | 243 | options->client_alive_interval = 0; |
3ffc6336 | 244 | if (options->client_alive_count_max == -1) |
245 | options->client_alive_count_max = 3; | |
5df83e07 | 246 | if (options->authorized_keys_file2 == NULL) { |
247 | /* authorized_keys_file2 falls back to authorized_keys_file */ | |
248 | if (options->authorized_keys_file != NULL) | |
249 | options->authorized_keys_file2 = options->authorized_keys_file; | |
250 | else | |
251 | options->authorized_keys_file2 = _PATH_SSH_USER_PERMITTED_KEYS2; | |
252 | } | |
253 | if (options->authorized_keys_file == NULL) | |
254 | options->authorized_keys_file = _PATH_SSH_USER_PERMITTED_KEYS; | |
1853d1ef | 255 | |
2ee1b704 | 256 | /* Turn privilege separation on by default */ |
1853d1ef | 257 | if (use_privsep == -1) |
2ee1b704 | 258 | use_privsep = 1; |
e299a298 | 259 | |
260 | #if !defined(HAVE_MMAP) || !defined(MAP_ANON) | |
261 | if (use_privsep && options->compression == 1) { | |
262 | error("This platform does not support both privilege " | |
263 | "separation and compression"); | |
264 | error("Compression disabled"); | |
265 | options->compression = 0; | |
266 | } | |
267 | #endif | |
268 | ||
8efc0c15 | 269 | } |
270 | ||
8efc0c15 | 271 | /* Keyword tokens. */ |
5260325f | 272 | typedef enum { |
273 | sBadOption, /* == unknown option */ | |
e15895cd | 274 | /* Portable-specific options */ |
275 | sPAMAuthenticationViaKbdInt, | |
276 | /* Standard Options */ | |
5260325f | 277 | sPort, sHostKeyFile, sServerKeyBits, sLoginGraceTime, sKeyRegenerationTime, |
278 | sPermitRootLogin, sLogFacility, sLogLevel, | |
279 | sRhostsAuthentication, sRhostsRSAAuthentication, sRSAAuthentication, | |
ced49be2 | 280 | #if defined(KRB4) || defined(KRB5) |
5260325f | 281 | sKerberosAuthentication, sKerberosOrLocalPasswd, sKerberosTicketCleanup, |
8efc0c15 | 282 | #endif |
ced49be2 | 283 | #if defined(AFS) || defined(KRB5) |
284 | sKerberosTgtPassing, | |
285 | #endif | |
8efc0c15 | 286 | #ifdef AFS |
ced49be2 | 287 | sAFSTokenPassing, |
8efc0c15 | 288 | #endif |
d464095c | 289 | sChallengeResponseAuthentication, |
94ec8c6b | 290 | sPasswordAuthentication, sKbdInteractiveAuthentication, sListenAddress, |
4f4648f9 | 291 | sPrintMotd, sPrintLastLog, sIgnoreRhosts, |
e6e573bd | 292 | sX11Forwarding, sX11DisplayOffset, sX11UseLocalhost, |
5c53a31e | 293 | sStrictModes, sEmptyPasswd, sKeepAlives, |
636f76ca | 294 | sUseLogin, sAllowTcpForwarding, sCompression, |
33de75a3 | 295 | sAllowUsers, sDenyUsers, sAllowGroups, sDenyGroups, |
b2552997 | 296 | sIgnoreUserKnownHosts, sCiphers, sMacs, sProtocol, sPidFile, |
fa08c86b | 297 | sGatewayPorts, sPubkeyAuthentication, sXAuthLocation, sSubsystem, sMaxStartups, |
bf4c5edc | 298 | sBanner, sVerifyReverseMapping, sHostbasedAuthentication, |
184eed6a | 299 | sHostbasedUsesNameFromPacketOnly, sClientAliveInterval, |
c8445989 | 300 | sClientAliveCountMax, sAuthorizedKeysFile, sAuthorizedKeysFile2, |
2ea6de2b | 301 | sUsePrivilegeSeparation, |
2717fa0f | 302 | sDeprecated |
8efc0c15 | 303 | } ServerOpCodes; |
304 | ||
305 | /* Textual representation of the tokens. */ | |
5260325f | 306 | static struct { |
307 | const char *name; | |
308 | ServerOpCodes opcode; | |
309 | } keywords[] = { | |
e15895cd | 310 | /* Portable-specific options */ |
311 | { "PAMAuthenticationViaKbdInt", sPAMAuthenticationViaKbdInt }, | |
312 | /* Standard Options */ | |
5260325f | 313 | { "port", sPort }, |
314 | { "hostkey", sHostKeyFile }, | |
fa08c86b | 315 | { "hostdsakey", sHostKeyFile }, /* alias */ |
2b87da3b | 316 | { "pidfile", sPidFile }, |
5260325f | 317 | { "serverkeybits", sServerKeyBits }, |
318 | { "logingracetime", sLoginGraceTime }, | |
319 | { "keyregenerationinterval", sKeyRegenerationTime }, | |
320 | { "permitrootlogin", sPermitRootLogin }, | |
321 | { "syslogfacility", sLogFacility }, | |
322 | { "loglevel", sLogLevel }, | |
323 | { "rhostsauthentication", sRhostsAuthentication }, | |
324 | { "rhostsrsaauthentication", sRhostsRSAAuthentication }, | |
8002af61 | 325 | { "hostbasedauthentication", sHostbasedAuthentication }, |
326 | { "hostbasedusesnamefrompacketonly", sHostbasedUsesNameFromPacketOnly }, | |
5260325f | 327 | { "rsaauthentication", sRSAAuthentication }, |
fa08c86b | 328 | { "pubkeyauthentication", sPubkeyAuthentication }, |
329 | { "dsaauthentication", sPubkeyAuthentication }, /* alias */ | |
ced49be2 | 330 | #if defined(KRB4) || defined(KRB5) |
5260325f | 331 | { "kerberosauthentication", sKerberosAuthentication }, |
332 | { "kerberosorlocalpasswd", sKerberosOrLocalPasswd }, | |
333 | { "kerberosticketcleanup", sKerberosTicketCleanup }, | |
8efc0c15 | 334 | #endif |
ced49be2 | 335 | #if defined(AFS) || defined(KRB5) |
5260325f | 336 | { "kerberostgtpassing", sKerberosTgtPassing }, |
ced49be2 | 337 | #endif |
338 | #ifdef AFS | |
5260325f | 339 | { "afstokenpassing", sAFSTokenPassing }, |
8efc0c15 | 340 | #endif |
5260325f | 341 | { "passwordauthentication", sPasswordAuthentication }, |
94ec8c6b | 342 | { "kbdinteractiveauthentication", sKbdInteractiveAuthentication }, |
d464095c | 343 | { "challengeresponseauthentication", sChallengeResponseAuthentication }, |
344 | { "skeyauthentication", sChallengeResponseAuthentication }, /* alias */ | |
5c53a31e | 345 | { "checkmail", sDeprecated }, |
5260325f | 346 | { "listenaddress", sListenAddress }, |
347 | { "printmotd", sPrintMotd }, | |
4f4648f9 | 348 | { "printlastlog", sPrintLastLog }, |
5260325f | 349 | { "ignorerhosts", sIgnoreRhosts }, |
350 | { "ignoreuserknownhosts", sIgnoreUserKnownHosts }, | |
351 | { "x11forwarding", sX11Forwarding }, | |
352 | { "x11displayoffset", sX11DisplayOffset }, | |
e6e573bd | 353 | { "x11uselocalhost", sX11UseLocalhost }, |
fa649821 | 354 | { "xauthlocation", sXAuthLocation }, |
5260325f | 355 | { "strictmodes", sStrictModes }, |
356 | { "permitemptypasswords", sEmptyPasswd }, | |
357 | { "uselogin", sUseLogin }, | |
636f76ca | 358 | { "compression", sCompression }, |
5260325f | 359 | { "keepalive", sKeepAlives }, |
33de75a3 | 360 | { "allowtcpforwarding", sAllowTcpForwarding }, |
5260325f | 361 | { "allowusers", sAllowUsers }, |
362 | { "denyusers", sDenyUsers }, | |
363 | { "allowgroups", sAllowGroups }, | |
364 | { "denygroups", sDenyGroups }, | |
a8be9f80 | 365 | { "ciphers", sCiphers }, |
b2552997 | 366 | { "macs", sMacs }, |
a8be9f80 | 367 | { "protocol", sProtocol }, |
1d1ffb87 | 368 | { "gatewayports", sGatewayPorts }, |
38c295d6 | 369 | { "subsystem", sSubsystem }, |
089fbbd2 | 370 | { "maxstartups", sMaxStartups }, |
eea39c02 | 371 | { "banner", sBanner }, |
bf4c5edc | 372 | { "verifyreversemapping", sVerifyReverseMapping }, |
373 | { "reversemappingcheck", sVerifyReverseMapping }, | |
3ffc6336 | 374 | { "clientaliveinterval", sClientAliveInterval }, |
375 | { "clientalivecountmax", sClientAliveCountMax }, | |
c8445989 | 376 | { "authorizedkeysfile", sAuthorizedKeysFile }, |
377 | { "authorizedkeysfile2", sAuthorizedKeysFile2 }, | |
1853d1ef | 378 | { "useprivilegeseparation", sUsePrivilegeSeparation}, |
17a3011c | 379 | { NULL, sBadOption } |
8efc0c15 | 380 | }; |
381 | ||
aa3378df | 382 | /* |
6be9a5e8 | 383 | * Returns the number of the token pointed to by cp or sBadOption. |
aa3378df | 384 | */ |
8efc0c15 | 385 | |
6ae2364d | 386 | static ServerOpCodes |
5260325f | 387 | parse_token(const char *cp, const char *filename, |
388 | int linenum) | |
8efc0c15 | 389 | { |
1e3b8b07 | 390 | u_int i; |
8efc0c15 | 391 | |
5260325f | 392 | for (i = 0; keywords[i].name; i++) |
aa3378df | 393 | if (strcasecmp(cp, keywords[i].name) == 0) |
5260325f | 394 | return keywords[i].opcode; |
8efc0c15 | 395 | |
b7c70970 | 396 | error("%s: line %d: Bad configuration option: %s", |
397 | filename, linenum, cp); | |
5260325f | 398 | return sBadOption; |
8efc0c15 | 399 | } |
400 | ||
396c147e | 401 | static void |
2d2a2c65 | 402 | add_listen_addr(ServerOptions *options, char *addr, u_short port) |
48e671d5 | 403 | { |
48e671d5 | 404 | int i; |
405 | ||
406 | if (options->num_ports == 0) | |
407 | options->ports[options->num_ports++] = SSH_DEFAULT_PORT; | |
2d2a2c65 | 408 | if (port == 0) |
d11c1288 | 409 | for (i = 0; i < options->num_ports; i++) |
410 | add_one_listen_addr(options, addr, options->ports[i]); | |
411 | else | |
2d2a2c65 | 412 | add_one_listen_addr(options, addr, port); |
d11c1288 | 413 | } |
414 | ||
396c147e | 415 | static void |
d11c1288 | 416 | add_one_listen_addr(ServerOptions *options, char *addr, u_short port) |
417 | { | |
418 | struct addrinfo hints, *ai, *aitop; | |
419 | char strport[NI_MAXSERV]; | |
420 | int gaierr; | |
421 | ||
422 | memset(&hints, 0, sizeof(hints)); | |
423 | hints.ai_family = IPv4or6; | |
424 | hints.ai_socktype = SOCK_STREAM; | |
425 | hints.ai_flags = (addr == NULL) ? AI_PASSIVE : 0; | |
426 | snprintf(strport, sizeof strport, "%d", port); | |
427 | if ((gaierr = getaddrinfo(addr, strport, &hints, &aitop)) != 0) | |
428 | fatal("bad addr or host: %s (%s)", | |
429 | addr ? addr : "<NULL>", | |
430 | gai_strerror(gaierr)); | |
431 | for (ai = aitop; ai->ai_next; ai = ai->ai_next) | |
432 | ; | |
433 | ai->ai_next = options->listen_addrs; | |
434 | options->listen_addrs = aitop; | |
48e671d5 | 435 | } |
436 | ||
2717fa0f | 437 | int |
438 | process_server_config_line(ServerOptions *options, char *line, | |
439 | const char *filename, int linenum) | |
8efc0c15 | 440 | { |
d11c1288 | 441 | char *cp, **charptr, *arg, *p; |
2717fa0f | 442 | int *intptr, value; |
5260325f | 443 | ServerOpCodes opcode; |
97de229c | 444 | int i, n; |
5260325f | 445 | |
2717fa0f | 446 | cp = line; |
447 | arg = strdelim(&cp); | |
448 | /* Ignore leading whitespace */ | |
449 | if (*arg == '\0') | |
704b1659 | 450 | arg = strdelim(&cp); |
2717fa0f | 451 | if (!arg || !*arg || *arg == '#') |
452 | return 0; | |
453 | intptr = NULL; | |
454 | charptr = NULL; | |
455 | opcode = parse_token(arg, filename, linenum); | |
456 | switch (opcode) { | |
457 | /* Portable-specific options */ | |
458 | case sPAMAuthenticationViaKbdInt: | |
459 | intptr = &options->pam_authentication_via_kbd_int; | |
460 | goto parse_flag; | |
48e671d5 | 461 | |
2717fa0f | 462 | /* Standard Options */ |
463 | case sBadOption: | |
464 | return -1; | |
465 | case sPort: | |
466 | /* ignore ports from configfile if cmdline specifies ports */ | |
467 | if (options->ports_from_cmdline) | |
468 | return 0; | |
469 | if (options->listen_addrs != NULL) | |
470 | fatal("%s line %d: ports must be specified before " | |
3a454b6a | 471 | "ListenAddress.", filename, linenum); |
2717fa0f | 472 | if (options->num_ports >= MAX_PORTS) |
473 | fatal("%s line %d: too many ports.", | |
474 | filename, linenum); | |
475 | arg = strdelim(&cp); | |
476 | if (!arg || *arg == '\0') | |
477 | fatal("%s line %d: missing port number.", | |
478 | filename, linenum); | |
479 | options->ports[options->num_ports++] = a2port(arg); | |
480 | if (options->ports[options->num_ports-1] == 0) | |
481 | fatal("%s line %d: Badly formatted port number.", | |
482 | filename, linenum); | |
483 | break; | |
484 | ||
485 | case sServerKeyBits: | |
486 | intptr = &options->server_key_bits; | |
5260325f | 487 | parse_int: |
2717fa0f | 488 | arg = strdelim(&cp); |
489 | if (!arg || *arg == '\0') | |
490 | fatal("%s line %d: missing integer value.", | |
491 | filename, linenum); | |
492 | value = atoi(arg); | |
493 | if (*intptr == -1) | |
494 | *intptr = value; | |
495 | break; | |
496 | ||
497 | case sLoginGraceTime: | |
498 | intptr = &options->login_grace_time; | |
e2b1fb42 | 499 | parse_time: |
2717fa0f | 500 | arg = strdelim(&cp); |
501 | if (!arg || *arg == '\0') | |
502 | fatal("%s line %d: missing time value.", | |
503 | filename, linenum); | |
504 | if ((value = convtime(arg)) == -1) | |
505 | fatal("%s line %d: invalid time value.", | |
506 | filename, linenum); | |
507 | if (*intptr == -1) | |
508 | *intptr = value; | |
509 | break; | |
510 | ||
511 | case sKeyRegenerationTime: | |
512 | intptr = &options->key_regeneration_time; | |
513 | goto parse_time; | |
514 | ||
515 | case sListenAddress: | |
516 | arg = strdelim(&cp); | |
517 | if (!arg || *arg == '\0' || strncmp(arg, "[]", 2) == 0) | |
518 | fatal("%s line %d: missing inet addr.", | |
519 | filename, linenum); | |
520 | if (*arg == '[') { | |
521 | if ((p = strchr(arg, ']')) == NULL) | |
522 | fatal("%s line %d: bad ipv6 inet addr usage.", | |
e2b1fb42 | 523 | filename, linenum); |
2717fa0f | 524 | arg++; |
525 | memmove(p, p+1, strlen(p+1)+1); | |
526 | } else if (((p = strchr(arg, ':')) == NULL) || | |
527 | (strchr(p+1, ':') != NULL)) { | |
528 | add_listen_addr(options, arg, 0); | |
e2b1fb42 | 529 | break; |
2717fa0f | 530 | } |
531 | if (*p == ':') { | |
532 | u_short port; | |
5260325f | 533 | |
2717fa0f | 534 | p++; |
535 | if (*p == '\0') | |
536 | fatal("%s line %d: bad inet addr:port usage.", | |
48e671d5 | 537 | filename, linenum); |
2717fa0f | 538 | else { |
539 | *(p-1) = '\0'; | |
540 | if ((port = a2port(p)) == 0) | |
541 | fatal("%s line %d: bad port number.", | |
d11c1288 | 542 | filename, linenum); |
2717fa0f | 543 | add_listen_addr(options, arg, port); |
d11c1288 | 544 | } |
2717fa0f | 545 | } else if (*p == '\0') |
546 | add_listen_addr(options, arg, 0); | |
547 | else | |
548 | fatal("%s line %d: bad inet addr usage.", | |
549 | filename, linenum); | |
550 | break; | |
551 | ||
552 | case sHostKeyFile: | |
553 | intptr = &options->num_host_key_files; | |
554 | if (*intptr >= MAX_HOSTKEYS) | |
555 | fatal("%s line %d: too many host keys specified (max %d).", | |
556 | filename, linenum, MAX_HOSTKEYS); | |
557 | charptr = &options->host_key_files[*intptr]; | |
fa649821 | 558 | parse_filename: |
2717fa0f | 559 | arg = strdelim(&cp); |
560 | if (!arg || *arg == '\0') | |
561 | fatal("%s line %d: missing file name.", | |
562 | filename, linenum); | |
563 | if (*charptr == NULL) { | |
564 | *charptr = tilde_expand_filename(arg, getuid()); | |
565 | /* increase optional counter */ | |
566 | if (intptr != NULL) | |
567 | *intptr = *intptr + 1; | |
568 | } | |
569 | break; | |
0fbe8c74 | 570 | |
2717fa0f | 571 | case sPidFile: |
572 | charptr = &options->pid_file; | |
573 | goto parse_filename; | |
5260325f | 574 | |
2717fa0f | 575 | case sPermitRootLogin: |
576 | intptr = &options->permit_root_login; | |
577 | arg = strdelim(&cp); | |
578 | if (!arg || *arg == '\0') | |
579 | fatal("%s line %d: missing yes/" | |
580 | "without-password/forced-commands-only/no " | |
581 | "argument.", filename, linenum); | |
582 | value = 0; /* silence compiler */ | |
583 | if (strcmp(arg, "without-password") == 0) | |
584 | value = PERMIT_NO_PASSWD; | |
585 | else if (strcmp(arg, "forced-commands-only") == 0) | |
586 | value = PERMIT_FORCED_ONLY; | |
587 | else if (strcmp(arg, "yes") == 0) | |
588 | value = PERMIT_YES; | |
589 | else if (strcmp(arg, "no") == 0) | |
590 | value = PERMIT_NO; | |
591 | else | |
592 | fatal("%s line %d: Bad yes/" | |
593 | "without-password/forced-commands-only/no " | |
594 | "argument: %s", filename, linenum, arg); | |
595 | if (*intptr == -1) | |
596 | *intptr = value; | |
597 | break; | |
598 | ||
599 | case sIgnoreRhosts: | |
600 | intptr = &options->ignore_rhosts; | |
5260325f | 601 | parse_flag: |
2717fa0f | 602 | arg = strdelim(&cp); |
603 | if (!arg || *arg == '\0') | |
604 | fatal("%s line %d: missing yes/no argument.", | |
605 | filename, linenum); | |
606 | value = 0; /* silence compiler */ | |
607 | if (strcmp(arg, "yes") == 0) | |
608 | value = 1; | |
609 | else if (strcmp(arg, "no") == 0) | |
610 | value = 0; | |
611 | else | |
612 | fatal("%s line %d: Bad yes/no argument: %s", | |
613 | filename, linenum, arg); | |
614 | if (*intptr == -1) | |
615 | *intptr = value; | |
616 | break; | |
617 | ||
618 | case sIgnoreUserKnownHosts: | |
619 | intptr = &options->ignore_user_known_hosts; | |
620 | goto parse_flag; | |
621 | ||
622 | case sRhostsAuthentication: | |
623 | intptr = &options->rhosts_authentication; | |
624 | goto parse_flag; | |
625 | ||
626 | case sRhostsRSAAuthentication: | |
627 | intptr = &options->rhosts_rsa_authentication; | |
628 | goto parse_flag; | |
629 | ||
630 | case sHostbasedAuthentication: | |
631 | intptr = &options->hostbased_authentication; | |
632 | goto parse_flag; | |
633 | ||
634 | case sHostbasedUsesNameFromPacketOnly: | |
635 | intptr = &options->hostbased_uses_name_from_packet_only; | |
636 | goto parse_flag; | |
637 | ||
638 | case sRSAAuthentication: | |
639 | intptr = &options->rsa_authentication; | |
640 | goto parse_flag; | |
641 | ||
642 | case sPubkeyAuthentication: | |
643 | intptr = &options->pubkey_authentication; | |
644 | goto parse_flag; | |
645 | #if defined(KRB4) || defined(KRB5) | |
646 | case sKerberosAuthentication: | |
647 | intptr = &options->kerberos_authentication; | |
648 | goto parse_flag; | |
5260325f | 649 | |
2717fa0f | 650 | case sKerberosOrLocalPasswd: |
651 | intptr = &options->kerberos_or_local_passwd; | |
652 | goto parse_flag; | |
5260325f | 653 | |
2717fa0f | 654 | case sKerberosTicketCleanup: |
655 | intptr = &options->kerberos_ticket_cleanup; | |
656 | goto parse_flag; | |
657 | #endif | |
658 | #if defined(AFS) || defined(KRB5) | |
659 | case sKerberosTgtPassing: | |
660 | intptr = &options->kerberos_tgt_passing; | |
661 | goto parse_flag; | |
662 | #endif | |
663 | #ifdef AFS | |
664 | case sAFSTokenPassing: | |
665 | intptr = &options->afs_token_passing; | |
666 | goto parse_flag; | |
667 | #endif | |
5260325f | 668 | |
2717fa0f | 669 | case sPasswordAuthentication: |
670 | intptr = &options->password_authentication; | |
671 | goto parse_flag; | |
5260325f | 672 | |
2717fa0f | 673 | case sKbdInteractiveAuthentication: |
674 | intptr = &options->kbd_interactive_authentication; | |
675 | goto parse_flag; | |
8002af61 | 676 | |
2717fa0f | 677 | case sChallengeResponseAuthentication: |
678 | intptr = &options->challenge_response_authentication; | |
679 | goto parse_flag; | |
8002af61 | 680 | |
2717fa0f | 681 | case sPrintMotd: |
682 | intptr = &options->print_motd; | |
683 | goto parse_flag; | |
5260325f | 684 | |
2717fa0f | 685 | case sPrintLastLog: |
686 | intptr = &options->print_lastlog; | |
687 | goto parse_flag; | |
5260325f | 688 | |
2717fa0f | 689 | case sX11Forwarding: |
690 | intptr = &options->x11_forwarding; | |
691 | goto parse_flag; | |
5260325f | 692 | |
2717fa0f | 693 | case sX11DisplayOffset: |
694 | intptr = &options->x11_display_offset; | |
695 | goto parse_int; | |
8efc0c15 | 696 | |
e6e573bd | 697 | case sX11UseLocalhost: |
698 | intptr = &options->x11_use_localhost; | |
699 | goto parse_flag; | |
700 | ||
2717fa0f | 701 | case sXAuthLocation: |
702 | charptr = &options->xauth_location; | |
703 | goto parse_filename; | |
5260325f | 704 | |
2717fa0f | 705 | case sStrictModes: |
706 | intptr = &options->strict_modes; | |
707 | goto parse_flag; | |
5260325f | 708 | |
2717fa0f | 709 | case sKeepAlives: |
710 | intptr = &options->keepalives; | |
711 | goto parse_flag; | |
33de75a3 | 712 | |
2717fa0f | 713 | case sEmptyPasswd: |
714 | intptr = &options->permit_empty_passwd; | |
715 | goto parse_flag; | |
5260325f | 716 | |
2717fa0f | 717 | case sUseLogin: |
718 | intptr = &options->use_login; | |
719 | goto parse_flag; | |
5260325f | 720 | |
636f76ca | 721 | case sCompression: |
722 | intptr = &options->compression; | |
723 | goto parse_flag; | |
724 | ||
2717fa0f | 725 | case sGatewayPorts: |
726 | intptr = &options->gateway_ports; | |
727 | goto parse_flag; | |
5260325f | 728 | |
bf4c5edc | 729 | case sVerifyReverseMapping: |
730 | intptr = &options->verify_reverse_mapping; | |
2717fa0f | 731 | goto parse_flag; |
5260325f | 732 | |
2717fa0f | 733 | case sLogFacility: |
734 | intptr = (int *) &options->log_facility; | |
735 | arg = strdelim(&cp); | |
736 | value = log_facility_number(arg); | |
5eaf8578 | 737 | if (value == SYSLOG_FACILITY_NOT_SET) |
2717fa0f | 738 | fatal("%.200s line %d: unsupported log facility '%s'", |
739 | filename, linenum, arg ? arg : "<NONE>"); | |
740 | if (*intptr == -1) | |
741 | *intptr = (SyslogFacility) value; | |
742 | break; | |
743 | ||
744 | case sLogLevel: | |
745 | intptr = (int *) &options->log_level; | |
746 | arg = strdelim(&cp); | |
747 | value = log_level_number(arg); | |
5eaf8578 | 748 | if (value == SYSLOG_LEVEL_NOT_SET) |
2717fa0f | 749 | fatal("%.200s line %d: unsupported log level '%s'", |
750 | filename, linenum, arg ? arg : "<NONE>"); | |
751 | if (*intptr == -1) | |
752 | *intptr = (LogLevel) value; | |
753 | break; | |
754 | ||
755 | case sAllowTcpForwarding: | |
756 | intptr = &options->allow_tcp_forwarding; | |
757 | goto parse_flag; | |
758 | ||
1853d1ef | 759 | case sUsePrivilegeSeparation: |
760 | intptr = &use_privsep; | |
761 | goto parse_flag; | |
762 | ||
2717fa0f | 763 | case sAllowUsers: |
764 | while ((arg = strdelim(&cp)) && *arg != '\0') { | |
765 | if (options->num_allow_users >= MAX_ALLOW_USERS) | |
766 | fatal("%s line %d: too many allow users.", | |
767 | filename, linenum); | |
768 | options->allow_users[options->num_allow_users++] = xstrdup(arg); | |
769 | } | |
770 | break; | |
a8be9f80 | 771 | |
2717fa0f | 772 | case sDenyUsers: |
773 | while ((arg = strdelim(&cp)) && *arg != '\0') { | |
774 | if (options->num_deny_users >= MAX_DENY_USERS) | |
775 | fatal( "%s line %d: too many deny users.", | |
776 | filename, linenum); | |
777 | options->deny_users[options->num_deny_users++] = xstrdup(arg); | |
778 | } | |
779 | break; | |
b2552997 | 780 | |
2717fa0f | 781 | case sAllowGroups: |
782 | while ((arg = strdelim(&cp)) && *arg != '\0') { | |
783 | if (options->num_allow_groups >= MAX_ALLOW_GROUPS) | |
784 | fatal("%s line %d: too many allow groups.", | |
785 | filename, linenum); | |
786 | options->allow_groups[options->num_allow_groups++] = xstrdup(arg); | |
787 | } | |
788 | break; | |
a8be9f80 | 789 | |
2717fa0f | 790 | case sDenyGroups: |
791 | while ((arg = strdelim(&cp)) && *arg != '\0') { | |
792 | if (options->num_deny_groups >= MAX_DENY_GROUPS) | |
793 | fatal("%s line %d: too many deny groups.", | |
794 | filename, linenum); | |
795 | options->deny_groups[options->num_deny_groups++] = xstrdup(arg); | |
796 | } | |
797 | break; | |
38c295d6 | 798 | |
2717fa0f | 799 | case sCiphers: |
800 | arg = strdelim(&cp); | |
801 | if (!arg || *arg == '\0') | |
802 | fatal("%s line %d: Missing argument.", filename, linenum); | |
803 | if (!ciphers_valid(arg)) | |
804 | fatal("%s line %d: Bad SSH2 cipher spec '%s'.", | |
805 | filename, linenum, arg ? arg : "<NONE>"); | |
806 | if (options->ciphers == NULL) | |
807 | options->ciphers = xstrdup(arg); | |
808 | break; | |
809 | ||
810 | case sMacs: | |
811 | arg = strdelim(&cp); | |
812 | if (!arg || *arg == '\0') | |
813 | fatal("%s line %d: Missing argument.", filename, linenum); | |
814 | if (!mac_valid(arg)) | |
815 | fatal("%s line %d: Bad SSH2 mac spec '%s'.", | |
816 | filename, linenum, arg ? arg : "<NONE>"); | |
817 | if (options->macs == NULL) | |
818 | options->macs = xstrdup(arg); | |
819 | break; | |
820 | ||
821 | case sProtocol: | |
822 | intptr = &options->protocol; | |
823 | arg = strdelim(&cp); | |
824 | if (!arg || *arg == '\0') | |
825 | fatal("%s line %d: Missing argument.", filename, linenum); | |
826 | value = proto_spec(arg); | |
827 | if (value == SSH_PROTO_UNKNOWN) | |
828 | fatal("%s line %d: Bad protocol spec '%s'.", | |
184eed6a | 829 | filename, linenum, arg ? arg : "<NONE>"); |
2717fa0f | 830 | if (*intptr == SSH_PROTO_UNKNOWN) |
831 | *intptr = value; | |
832 | break; | |
833 | ||
834 | case sSubsystem: | |
835 | if (options->num_subsystems >= MAX_SUBSYSTEMS) { | |
836 | fatal("%s line %d: too many subsystems defined.", | |
184eed6a | 837 | filename, linenum); |
2717fa0f | 838 | } |
839 | arg = strdelim(&cp); | |
840 | if (!arg || *arg == '\0') | |
841 | fatal("%s line %d: Missing subsystem name.", | |
184eed6a | 842 | filename, linenum); |
2717fa0f | 843 | for (i = 0; i < options->num_subsystems; i++) |
844 | if (strcmp(arg, options->subsystem_name[i]) == 0) | |
845 | fatal("%s line %d: Subsystem '%s' already defined.", | |
184eed6a | 846 | filename, linenum, arg); |
2717fa0f | 847 | options->subsystem_name[options->num_subsystems] = xstrdup(arg); |
848 | arg = strdelim(&cp); | |
849 | if (!arg || *arg == '\0') | |
850 | fatal("%s line %d: Missing subsystem command.", | |
184eed6a | 851 | filename, linenum); |
2717fa0f | 852 | options->subsystem_command[options->num_subsystems] = xstrdup(arg); |
853 | options->num_subsystems++; | |
854 | break; | |
855 | ||
856 | case sMaxStartups: | |
857 | arg = strdelim(&cp); | |
858 | if (!arg || *arg == '\0') | |
859 | fatal("%s line %d: Missing MaxStartups spec.", | |
184eed6a | 860 | filename, linenum); |
2717fa0f | 861 | if ((n = sscanf(arg, "%d:%d:%d", |
862 | &options->max_startups_begin, | |
863 | &options->max_startups_rate, | |
864 | &options->max_startups)) == 3) { | |
865 | if (options->max_startups_begin > | |
866 | options->max_startups || | |
867 | options->max_startups_rate > 100 || | |
868 | options->max_startups_rate < 1) | |
c345cf9d | 869 | fatal("%s line %d: Illegal MaxStartups spec.", |
97de229c | 870 | filename, linenum); |
2717fa0f | 871 | } else if (n != 1) |
872 | fatal("%s line %d: Illegal MaxStartups spec.", | |
873 | filename, linenum); | |
874 | else | |
875 | options->max_startups = options->max_startups_begin; | |
876 | break; | |
877 | ||
878 | case sBanner: | |
879 | charptr = &options->banner; | |
880 | goto parse_filename; | |
881 | /* | |
882 | * These options can contain %X options expanded at | |
883 | * connect time, so that you can specify paths like: | |
884 | * | |
885 | * AuthorizedKeysFile /etc/ssh_keys/%u | |
886 | */ | |
887 | case sAuthorizedKeysFile: | |
888 | case sAuthorizedKeysFile2: | |
889 | charptr = (opcode == sAuthorizedKeysFile ) ? | |
890 | &options->authorized_keys_file : | |
891 | &options->authorized_keys_file2; | |
892 | goto parse_filename; | |
893 | ||
894 | case sClientAliveInterval: | |
895 | intptr = &options->client_alive_interval; | |
896 | goto parse_time; | |
897 | ||
898 | case sClientAliveCountMax: | |
899 | intptr = &options->client_alive_count_max; | |
900 | goto parse_int; | |
901 | ||
902 | case sDeprecated: | |
903 | log("%s line %d: Deprecated option %s", | |
904 | filename, linenum, arg); | |
905 | while (arg) | |
906 | arg = strdelim(&cp); | |
907 | break; | |
908 | ||
909 | default: | |
910 | fatal("%s line %d: Missing handler for opcode %s (%d)", | |
911 | filename, linenum, arg, opcode); | |
912 | } | |
913 | if ((arg = strdelim(&cp)) != NULL && *arg != '\0') | |
914 | fatal("%s line %d: garbage at end of line; \"%.200s\".", | |
915 | filename, linenum, arg); | |
916 | return 0; | |
917 | } | |
089fbbd2 | 918 | |
2717fa0f | 919 | /* Reads the server configuration file. */ |
5c53a31e | 920 | |
2717fa0f | 921 | void |
922 | read_server_config(ServerOptions *options, const char *filename) | |
923 | { | |
924 | FILE *f; | |
925 | char line[1024]; | |
926 | int linenum; | |
927 | int bad_options = 0; | |
928 | ||
929 | f = fopen(filename, "r"); | |
930 | if (!f) { | |
931 | perror(filename); | |
932 | exit(1); | |
933 | } | |
934 | linenum = 0; | |
935 | while (fgets(line, sizeof(line), f)) { | |
936 | /* Update line number counter. */ | |
937 | linenum++; | |
938 | if (process_server_config_line(options, line, filename, linenum) != 0) | |
939 | bad_options++; | |
8efc0c15 | 940 | } |
5260325f | 941 | fclose(f); |
b7c70970 | 942 | if (bad_options > 0) |
943 | fatal("%s: terminating, %d bad configuration options", | |
944 | filename, bad_options); | |
8efc0c15 | 945 | } |