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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" | |
8f73f7bb | 13 | RCSID("$OpenBSD: servconf.c,v 1.126 2003/08/28 12:54:34 markus Exp $"); |
8efc0c15 | 14 | |
15 | #include "ssh.h" | |
42f11eb2 | 16 | #include "log.h" |
8efc0c15 | 17 | #include "servconf.h" |
18 | #include "xmalloc.h" | |
a8be9f80 | 19 | #include "compat.h" |
42f11eb2 | 20 | #include "pathnames.h" |
21 | #include "tildexpand.h" | |
22 | #include "misc.h" | |
23 | #include "cipher.h" | |
b2552997 | 24 | #include "kex.h" |
25 | #include "mac.h" | |
42f11eb2 | 26 | |
396c147e | 27 | static void add_listen_addr(ServerOptions *, char *, u_short); |
28 | static void add_one_listen_addr(ServerOptions *, char *, u_short); | |
48e671d5 | 29 | |
42f11eb2 | 30 | /* AF_UNSPEC or AF_INET or AF_INET6 */ |
31 | extern int IPv4or6; | |
1853d1ef | 32 | /* Use of privilege separation or not */ |
33 | extern int use_privsep; | |
42f11eb2 | 34 | |
8efc0c15 | 35 | /* Initializes the server options to their default values. */ |
36 | ||
6ae2364d | 37 | void |
5260325f | 38 | initialize_server_options(ServerOptions *options) |
8efc0c15 | 39 | { |
5260325f | 40 | memset(options, 0, sizeof(*options)); |
e15895cd | 41 | |
42 | /* Portable-specific options */ | |
7fceb20d | 43 | options->use_pam = -1; |
e15895cd | 44 | |
45 | /* Standard Options */ | |
48e671d5 | 46 | options->num_ports = 0; |
47 | options->ports_from_cmdline = 0; | |
48 | options->listen_addrs = NULL; | |
fa08c86b | 49 | options->num_host_key_files = 0; |
0fbe8c74 | 50 | options->pid_file = NULL; |
5260325f | 51 | options->server_key_bits = -1; |
52 | options->login_grace_time = -1; | |
53 | options->key_regeneration_time = -1; | |
15853e93 | 54 | options->permit_root_login = PERMIT_NOT_SET; |
5260325f | 55 | options->ignore_rhosts = -1; |
56 | options->ignore_user_known_hosts = -1; | |
57 | options->print_motd = -1; | |
4f4648f9 | 58 | options->print_lastlog = -1; |
5260325f | 59 | options->x11_forwarding = -1; |
60 | options->x11_display_offset = -1; | |
e6e573bd | 61 | options->x11_use_localhost = -1; |
fa649821 | 62 | options->xauth_location = NULL; |
5260325f | 63 | options->strict_modes = -1; |
64 | options->keepalives = -1; | |
5eaf8578 | 65 | options->log_facility = SYSLOG_FACILITY_NOT_SET; |
66 | options->log_level = SYSLOG_LEVEL_NOT_SET; | |
5260325f | 67 | options->rhosts_rsa_authentication = -1; |
8002af61 | 68 | options->hostbased_authentication = -1; |
69 | options->hostbased_uses_name_from_packet_only = -1; | |
5260325f | 70 | options->rsa_authentication = -1; |
fa08c86b | 71 | options->pubkey_authentication = -1; |
5260325f | 72 | options->kerberos_authentication = -1; |
73 | options->kerberos_or_local_passwd = -1; | |
74 | options->kerberos_ticket_cleanup = -1; | |
5260325f | 75 | options->kerberos_tgt_passing = -1; |
7364bd04 | 76 | options->gss_authentication=-1; |
77 | options->gss_cleanup_creds = -1; | |
5260325f | 78 | options->password_authentication = -1; |
94ec8c6b | 79 | options->kbd_interactive_authentication = -1; |
5ba55ada | 80 | options->challenge_response_authentication = -1; |
5260325f | 81 | options->permit_empty_passwd = -1; |
f00bab84 | 82 | options->permit_user_env = -1; |
5260325f | 83 | options->use_login = -1; |
636f76ca | 84 | options->compression = -1; |
33de75a3 | 85 | options->allow_tcp_forwarding = -1; |
5260325f | 86 | options->num_allow_users = 0; |
87 | options->num_deny_users = 0; | |
88 | options->num_allow_groups = 0; | |
89 | options->num_deny_groups = 0; | |
a8be9f80 | 90 | options->ciphers = NULL; |
b2552997 | 91 | options->macs = NULL; |
a8be9f80 | 92 | options->protocol = SSH_PROTO_UNKNOWN; |
1d1ffb87 | 93 | options->gateway_ports = -1; |
38c295d6 | 94 | options->num_subsystems = 0; |
c345cf9d | 95 | options->max_startups_begin = -1; |
96 | options->max_startups_rate = -1; | |
089fbbd2 | 97 | options->max_startups = -1; |
eea39c02 | 98 | options->banner = NULL; |
c5a7d788 | 99 | options->use_dns = -1; |
3ffc6336 | 100 | options->client_alive_interval = -1; |
101 | options->client_alive_count_max = -1; | |
c8445989 | 102 | options->authorized_keys_file = NULL; |
103 | options->authorized_keys_file2 = NULL; | |
1853d1ef | 104 | |
1853d1ef | 105 | /* Needs to be accessable in many places */ |
106 | use_privsep = -1; | |
8efc0c15 | 107 | } |
108 | ||
6ae2364d | 109 | void |
5260325f | 110 | fill_default_server_options(ServerOptions *options) |
8efc0c15 | 111 | { |
e15895cd | 112 | /* Portable-specific options */ |
7fceb20d | 113 | if (options->use_pam == -1) |
1457e7ff | 114 | options->use_pam = 1; |
e15895cd | 115 | |
116 | /* Standard Options */ | |
fa08c86b | 117 | if (options->protocol == SSH_PROTO_UNKNOWN) |
118 | options->protocol = SSH_PROTO_1|SSH_PROTO_2; | |
119 | if (options->num_host_key_files == 0) { | |
120 | /* fill default hostkeys for protocols */ | |
121 | if (options->protocol & SSH_PROTO_1) | |
0f84fe37 | 122 | options->host_key_files[options->num_host_key_files++] = |
123 | _PATH_HOST_KEY_FILE; | |
124 | if (options->protocol & SSH_PROTO_2) { | |
125 | options->host_key_files[options->num_host_key_files++] = | |
126 | _PATH_HOST_RSA_KEY_FILE; | |
127 | options->host_key_files[options->num_host_key_files++] = | |
128 | _PATH_HOST_DSA_KEY_FILE; | |
129 | } | |
fa08c86b | 130 | } |
48e671d5 | 131 | if (options->num_ports == 0) |
132 | options->ports[options->num_ports++] = SSH_DEFAULT_PORT; | |
133 | if (options->listen_addrs == NULL) | |
2d2a2c65 | 134 | add_listen_addr(options, NULL, 0); |
0fbe8c74 | 135 | if (options->pid_file == NULL) |
42f11eb2 | 136 | options->pid_file = _PATH_SSH_DAEMON_PID_FILE; |
5260325f | 137 | if (options->server_key_bits == -1) |
138 | options->server_key_bits = 768; | |
139 | if (options->login_grace_time == -1) | |
3445ca02 | 140 | options->login_grace_time = 120; |
5260325f | 141 | if (options->key_regeneration_time == -1) |
142 | options->key_regeneration_time = 3600; | |
15853e93 | 143 | if (options->permit_root_login == PERMIT_NOT_SET) |
144 | options->permit_root_login = PERMIT_YES; | |
5260325f | 145 | if (options->ignore_rhosts == -1) |
c8d54615 | 146 | options->ignore_rhosts = 1; |
5260325f | 147 | if (options->ignore_user_known_hosts == -1) |
148 | options->ignore_user_known_hosts = 0; | |
5260325f | 149 | if (options->print_motd == -1) |
150 | options->print_motd = 1; | |
4f4648f9 | 151 | if (options->print_lastlog == -1) |
152 | options->print_lastlog = 1; | |
5260325f | 153 | if (options->x11_forwarding == -1) |
c8d54615 | 154 | options->x11_forwarding = 0; |
5260325f | 155 | if (options->x11_display_offset == -1) |
c8d54615 | 156 | options->x11_display_offset = 10; |
e6e573bd | 157 | if (options->x11_use_localhost == -1) |
158 | options->x11_use_localhost = 1; | |
fa649821 | 159 | if (options->xauth_location == NULL) |
fd9ede94 | 160 | options->xauth_location = _PATH_XAUTH; |
5260325f | 161 | if (options->strict_modes == -1) |
162 | options->strict_modes = 1; | |
163 | if (options->keepalives == -1) | |
164 | options->keepalives = 1; | |
5eaf8578 | 165 | if (options->log_facility == SYSLOG_FACILITY_NOT_SET) |
5260325f | 166 | options->log_facility = SYSLOG_FACILITY_AUTH; |
5eaf8578 | 167 | if (options->log_level == SYSLOG_LEVEL_NOT_SET) |
59c97189 | 168 | options->log_level = SYSLOG_LEVEL_INFO; |
5260325f | 169 | if (options->rhosts_rsa_authentication == -1) |
c8d54615 | 170 | options->rhosts_rsa_authentication = 0; |
8002af61 | 171 | if (options->hostbased_authentication == -1) |
172 | options->hostbased_authentication = 0; | |
173 | if (options->hostbased_uses_name_from_packet_only == -1) | |
174 | options->hostbased_uses_name_from_packet_only = 0; | |
5260325f | 175 | if (options->rsa_authentication == -1) |
176 | options->rsa_authentication = 1; | |
fa08c86b | 177 | if (options->pubkey_authentication == -1) |
178 | options->pubkey_authentication = 1; | |
5260325f | 179 | if (options->kerberos_authentication == -1) |
eadc806d | 180 | options->kerberos_authentication = 0; |
5260325f | 181 | if (options->kerberos_or_local_passwd == -1) |
182 | options->kerberos_or_local_passwd = 1; | |
183 | if (options->kerberos_ticket_cleanup == -1) | |
184 | options->kerberos_ticket_cleanup = 1; | |
5260325f | 185 | if (options->kerberos_tgt_passing == -1) |
186 | options->kerberos_tgt_passing = 0; | |
7364bd04 | 187 | if (options->gss_authentication == -1) |
188 | options->gss_authentication = 0; | |
189 | if (options->gss_cleanup_creds == -1) | |
190 | options->gss_cleanup_creds = 1; | |
5260325f | 191 | if (options->password_authentication == -1) |
192 | options->password_authentication = 1; | |
94ec8c6b | 193 | if (options->kbd_interactive_authentication == -1) |
194 | options->kbd_interactive_authentication = 0; | |
5ba55ada | 195 | if (options->challenge_response_authentication == -1) |
196 | options->challenge_response_authentication = 1; | |
5260325f | 197 | if (options->permit_empty_passwd == -1) |
c8d54615 | 198 | options->permit_empty_passwd = 0; |
f00bab84 | 199 | if (options->permit_user_env == -1) |
200 | options->permit_user_env = 0; | |
5260325f | 201 | if (options->use_login == -1) |
202 | options->use_login = 0; | |
636f76ca | 203 | if (options->compression == -1) |
204 | options->compression = 1; | |
33de75a3 | 205 | if (options->allow_tcp_forwarding == -1) |
206 | options->allow_tcp_forwarding = 1; | |
1d1ffb87 | 207 | if (options->gateway_ports == -1) |
208 | options->gateway_ports = 0; | |
089fbbd2 | 209 | if (options->max_startups == -1) |
210 | options->max_startups = 10; | |
c345cf9d | 211 | if (options->max_startups_rate == -1) |
212 | options->max_startups_rate = 100; /* 100% */ | |
213 | if (options->max_startups_begin == -1) | |
214 | options->max_startups_begin = options->max_startups; | |
c5a7d788 | 215 | if (options->use_dns == -1) |
216 | options->use_dns = 1; | |
3ffc6336 | 217 | if (options->client_alive_interval == -1) |
184eed6a | 218 | options->client_alive_interval = 0; |
3ffc6336 | 219 | if (options->client_alive_count_max == -1) |
220 | options->client_alive_count_max = 3; | |
5df83e07 | 221 | if (options->authorized_keys_file2 == NULL) { |
222 | /* authorized_keys_file2 falls back to authorized_keys_file */ | |
223 | if (options->authorized_keys_file != NULL) | |
224 | options->authorized_keys_file2 = options->authorized_keys_file; | |
225 | else | |
226 | options->authorized_keys_file2 = _PATH_SSH_USER_PERMITTED_KEYS2; | |
227 | } | |
228 | if (options->authorized_keys_file == NULL) | |
229 | options->authorized_keys_file = _PATH_SSH_USER_PERMITTED_KEYS; | |
1853d1ef | 230 | |
2ee1b704 | 231 | /* Turn privilege separation on by default */ |
1853d1ef | 232 | if (use_privsep == -1) |
2ee1b704 | 233 | use_privsep = 1; |
e299a298 | 234 | |
4165b82e | 235 | #ifndef HAVE_MMAP |
e299a298 | 236 | if (use_privsep && options->compression == 1) { |
237 | error("This platform does not support both privilege " | |
238 | "separation and compression"); | |
239 | error("Compression disabled"); | |
240 | options->compression = 0; | |
241 | } | |
242 | #endif | |
243 | ||
8efc0c15 | 244 | } |
245 | ||
8efc0c15 | 246 | /* Keyword tokens. */ |
5260325f | 247 | typedef enum { |
248 | sBadOption, /* == unknown option */ | |
e15895cd | 249 | /* Portable-specific options */ |
7fceb20d | 250 | sUsePAM, |
e15895cd | 251 | /* Standard Options */ |
5260325f | 252 | sPort, sHostKeyFile, sServerKeyBits, sLoginGraceTime, sKeyRegenerationTime, |
253 | sPermitRootLogin, sLogFacility, sLogLevel, | |
0598d99d | 254 | sRhostsRSAAuthentication, sRSAAuthentication, |
5260325f | 255 | sKerberosAuthentication, sKerberosOrLocalPasswd, sKerberosTicketCleanup, |
1c590258 | 256 | sKerberosTgtPassing, sChallengeResponseAuthentication, |
94ec8c6b | 257 | sPasswordAuthentication, sKbdInteractiveAuthentication, sListenAddress, |
4f4648f9 | 258 | sPrintMotd, sPrintLastLog, sIgnoreRhosts, |
e6e573bd | 259 | sX11Forwarding, sX11DisplayOffset, sX11UseLocalhost, |
5c53a31e | 260 | sStrictModes, sEmptyPasswd, sKeepAlives, |
f00bab84 | 261 | sPermitUserEnvironment, sUseLogin, sAllowTcpForwarding, sCompression, |
33de75a3 | 262 | sAllowUsers, sDenyUsers, sAllowGroups, sDenyGroups, |
b2552997 | 263 | sIgnoreUserKnownHosts, sCiphers, sMacs, sProtocol, sPidFile, |
fa08c86b | 264 | sGatewayPorts, sPubkeyAuthentication, sXAuthLocation, sSubsystem, sMaxStartups, |
c5a7d788 | 265 | sBanner, sUseDNS, sHostbasedAuthentication, |
184eed6a | 266 | sHostbasedUsesNameFromPacketOnly, sClientAliveInterval, |
c8445989 | 267 | sClientAliveCountMax, sAuthorizedKeysFile, sAuthorizedKeysFile2, |
7364bd04 | 268 | sGssAuthentication, sGssCleanupCreds, |
2ea6de2b | 269 | sUsePrivilegeSeparation, |
a2144546 | 270 | sDeprecated, sUnsupported |
8efc0c15 | 271 | } ServerOpCodes; |
272 | ||
273 | /* Textual representation of the tokens. */ | |
5260325f | 274 | static struct { |
275 | const char *name; | |
276 | ServerOpCodes opcode; | |
277 | } keywords[] = { | |
e15895cd | 278 | /* Portable-specific options */ |
b06b11ad | 279 | #ifdef USE_PAM |
fe46678b | 280 | { "usepam", sUsePAM }, |
b06b11ad | 281 | #else |
fe46678b | 282 | { "usepam", sUnsupported }, |
b06b11ad | 283 | #endif |
fe46678b | 284 | { "pamauthenticationviakbdint", sDeprecated }, |
e15895cd | 285 | /* Standard Options */ |
5260325f | 286 | { "port", sPort }, |
287 | { "hostkey", sHostKeyFile }, | |
fa08c86b | 288 | { "hostdsakey", sHostKeyFile }, /* alias */ |
2b87da3b | 289 | { "pidfile", sPidFile }, |
5260325f | 290 | { "serverkeybits", sServerKeyBits }, |
291 | { "logingracetime", sLoginGraceTime }, | |
292 | { "keyregenerationinterval", sKeyRegenerationTime }, | |
293 | { "permitrootlogin", sPermitRootLogin }, | |
294 | { "syslogfacility", sLogFacility }, | |
295 | { "loglevel", sLogLevel }, | |
0598d99d | 296 | { "rhostsauthentication", sDeprecated }, |
5260325f | 297 | { "rhostsrsaauthentication", sRhostsRSAAuthentication }, |
8002af61 | 298 | { "hostbasedauthentication", sHostbasedAuthentication }, |
299 | { "hostbasedusesnamefrompacketonly", sHostbasedUsesNameFromPacketOnly }, | |
5260325f | 300 | { "rsaauthentication", sRSAAuthentication }, |
fa08c86b | 301 | { "pubkeyauthentication", sPubkeyAuthentication }, |
302 | { "dsaauthentication", sPubkeyAuthentication }, /* alias */ | |
1c590258 | 303 | #ifdef KRB5 |
5260325f | 304 | { "kerberosauthentication", sKerberosAuthentication }, |
305 | { "kerberosorlocalpasswd", sKerberosOrLocalPasswd }, | |
306 | { "kerberosticketcleanup", sKerberosTicketCleanup }, | |
a2144546 | 307 | #else |
308 | { "kerberosauthentication", sUnsupported }, | |
309 | { "kerberosorlocalpasswd", sUnsupported }, | |
310 | { "kerberosticketcleanup", sUnsupported }, | |
a2144546 | 311 | #endif |
8f73f7bb | 312 | { "kerberostgtpassing", sUnsupported }, |
a2144546 | 313 | { "afstokenpassing", sUnsupported }, |
7364bd04 | 314 | #ifdef GSSAPI |
315 | { "gssapiauthentication", sGssAuthentication }, | |
316 | { "gssapicleanupcreds", sGssCleanupCreds }, | |
317 | #else | |
318 | { "gssapiauthentication", sUnsupported }, | |
319 | { "gssapicleanupcreds", sUnsupported }, | |
320 | #endif | |
5260325f | 321 | { "passwordauthentication", sPasswordAuthentication }, |
94ec8c6b | 322 | { "kbdinteractiveauthentication", sKbdInteractiveAuthentication }, |
d464095c | 323 | { "challengeresponseauthentication", sChallengeResponseAuthentication }, |
324 | { "skeyauthentication", sChallengeResponseAuthentication }, /* alias */ | |
5c53a31e | 325 | { "checkmail", sDeprecated }, |
5260325f | 326 | { "listenaddress", sListenAddress }, |
327 | { "printmotd", sPrintMotd }, | |
4f4648f9 | 328 | { "printlastlog", sPrintLastLog }, |
5260325f | 329 | { "ignorerhosts", sIgnoreRhosts }, |
330 | { "ignoreuserknownhosts", sIgnoreUserKnownHosts }, | |
331 | { "x11forwarding", sX11Forwarding }, | |
332 | { "x11displayoffset", sX11DisplayOffset }, | |
e6e573bd | 333 | { "x11uselocalhost", sX11UseLocalhost }, |
fa649821 | 334 | { "xauthlocation", sXAuthLocation }, |
5260325f | 335 | { "strictmodes", sStrictModes }, |
336 | { "permitemptypasswords", sEmptyPasswd }, | |
f00bab84 | 337 | { "permituserenvironment", sPermitUserEnvironment }, |
5260325f | 338 | { "uselogin", sUseLogin }, |
636f76ca | 339 | { "compression", sCompression }, |
5260325f | 340 | { "keepalive", sKeepAlives }, |
33de75a3 | 341 | { "allowtcpforwarding", sAllowTcpForwarding }, |
5260325f | 342 | { "allowusers", sAllowUsers }, |
343 | { "denyusers", sDenyUsers }, | |
344 | { "allowgroups", sAllowGroups }, | |
345 | { "denygroups", sDenyGroups }, | |
a8be9f80 | 346 | { "ciphers", sCiphers }, |
b2552997 | 347 | { "macs", sMacs }, |
a8be9f80 | 348 | { "protocol", sProtocol }, |
1d1ffb87 | 349 | { "gatewayports", sGatewayPorts }, |
38c295d6 | 350 | { "subsystem", sSubsystem }, |
089fbbd2 | 351 | { "maxstartups", sMaxStartups }, |
eea39c02 | 352 | { "banner", sBanner }, |
c5a7d788 | 353 | { "usedns", sUseDNS }, |
354 | { "verifyreversemapping", sDeprecated }, | |
355 | { "reversemappingcheck", sDeprecated }, | |
3ffc6336 | 356 | { "clientaliveinterval", sClientAliveInterval }, |
357 | { "clientalivecountmax", sClientAliveCountMax }, | |
c8445989 | 358 | { "authorizedkeysfile", sAuthorizedKeysFile }, |
359 | { "authorizedkeysfile2", sAuthorizedKeysFile2 }, | |
1853d1ef | 360 | { "useprivilegeseparation", sUsePrivilegeSeparation}, |
17a3011c | 361 | { NULL, sBadOption } |
8efc0c15 | 362 | }; |
363 | ||
aa3378df | 364 | /* |
6be9a5e8 | 365 | * Returns the number of the token pointed to by cp or sBadOption. |
aa3378df | 366 | */ |
8efc0c15 | 367 | |
6ae2364d | 368 | static ServerOpCodes |
5260325f | 369 | parse_token(const char *cp, const char *filename, |
370 | int linenum) | |
8efc0c15 | 371 | { |
1e3b8b07 | 372 | u_int i; |
8efc0c15 | 373 | |
5260325f | 374 | for (i = 0; keywords[i].name; i++) |
aa3378df | 375 | if (strcasecmp(cp, keywords[i].name) == 0) |
5260325f | 376 | return keywords[i].opcode; |
8efc0c15 | 377 | |
b7c70970 | 378 | error("%s: line %d: Bad configuration option: %s", |
379 | filename, linenum, cp); | |
5260325f | 380 | return sBadOption; |
8efc0c15 | 381 | } |
382 | ||
396c147e | 383 | static void |
2d2a2c65 | 384 | add_listen_addr(ServerOptions *options, char *addr, u_short port) |
48e671d5 | 385 | { |
48e671d5 | 386 | int i; |
387 | ||
388 | if (options->num_ports == 0) | |
389 | options->ports[options->num_ports++] = SSH_DEFAULT_PORT; | |
2d2a2c65 | 390 | if (port == 0) |
d11c1288 | 391 | for (i = 0; i < options->num_ports; i++) |
392 | add_one_listen_addr(options, addr, options->ports[i]); | |
393 | else | |
2d2a2c65 | 394 | add_one_listen_addr(options, addr, port); |
d11c1288 | 395 | } |
396 | ||
396c147e | 397 | static void |
d11c1288 | 398 | add_one_listen_addr(ServerOptions *options, char *addr, u_short port) |
399 | { | |
400 | struct addrinfo hints, *ai, *aitop; | |
401 | char strport[NI_MAXSERV]; | |
402 | int gaierr; | |
403 | ||
404 | memset(&hints, 0, sizeof(hints)); | |
405 | hints.ai_family = IPv4or6; | |
406 | hints.ai_socktype = SOCK_STREAM; | |
407 | hints.ai_flags = (addr == NULL) ? AI_PASSIVE : 0; | |
7528d467 | 408 | snprintf(strport, sizeof strport, "%u", port); |
d11c1288 | 409 | if ((gaierr = getaddrinfo(addr, strport, &hints, &aitop)) != 0) |
410 | fatal("bad addr or host: %s (%s)", | |
411 | addr ? addr : "<NULL>", | |
412 | gai_strerror(gaierr)); | |
413 | for (ai = aitop; ai->ai_next; ai = ai->ai_next) | |
414 | ; | |
415 | ai->ai_next = options->listen_addrs; | |
416 | options->listen_addrs = aitop; | |
48e671d5 | 417 | } |
418 | ||
2717fa0f | 419 | int |
420 | process_server_config_line(ServerOptions *options, char *line, | |
421 | const char *filename, int linenum) | |
8efc0c15 | 422 | { |
d11c1288 | 423 | char *cp, **charptr, *arg, *p; |
7528d467 | 424 | int *intptr, value, i, n; |
5260325f | 425 | ServerOpCodes opcode; |
426 | ||
2717fa0f | 427 | cp = line; |
428 | arg = strdelim(&cp); | |
429 | /* Ignore leading whitespace */ | |
430 | if (*arg == '\0') | |
704b1659 | 431 | arg = strdelim(&cp); |
2717fa0f | 432 | if (!arg || !*arg || *arg == '#') |
433 | return 0; | |
434 | intptr = NULL; | |
435 | charptr = NULL; | |
436 | opcode = parse_token(arg, filename, linenum); | |
437 | switch (opcode) { | |
438 | /* Portable-specific options */ | |
7fceb20d | 439 | case sUsePAM: |
440 | intptr = &options->use_pam; | |
2717fa0f | 441 | goto parse_flag; |
48e671d5 | 442 | |
2717fa0f | 443 | /* Standard Options */ |
444 | case sBadOption: | |
445 | return -1; | |
446 | case sPort: | |
447 | /* ignore ports from configfile if cmdline specifies ports */ | |
448 | if (options->ports_from_cmdline) | |
449 | return 0; | |
450 | if (options->listen_addrs != NULL) | |
451 | fatal("%s line %d: ports must be specified before " | |
3a454b6a | 452 | "ListenAddress.", filename, linenum); |
2717fa0f | 453 | if (options->num_ports >= MAX_PORTS) |
454 | fatal("%s line %d: too many ports.", | |
455 | filename, linenum); | |
456 | arg = strdelim(&cp); | |
457 | if (!arg || *arg == '\0') | |
458 | fatal("%s line %d: missing port number.", | |
459 | filename, linenum); | |
460 | options->ports[options->num_ports++] = a2port(arg); | |
461 | if (options->ports[options->num_ports-1] == 0) | |
462 | fatal("%s line %d: Badly formatted port number.", | |
463 | filename, linenum); | |
464 | break; | |
465 | ||
466 | case sServerKeyBits: | |
467 | intptr = &options->server_key_bits; | |
5260325f | 468 | parse_int: |
2717fa0f | 469 | arg = strdelim(&cp); |
470 | if (!arg || *arg == '\0') | |
471 | fatal("%s line %d: missing integer value.", | |
472 | filename, linenum); | |
473 | value = atoi(arg); | |
474 | if (*intptr == -1) | |
475 | *intptr = value; | |
476 | break; | |
477 | ||
478 | case sLoginGraceTime: | |
479 | intptr = &options->login_grace_time; | |
e2b1fb42 | 480 | parse_time: |
2717fa0f | 481 | arg = strdelim(&cp); |
482 | if (!arg || *arg == '\0') | |
483 | fatal("%s line %d: missing time value.", | |
484 | filename, linenum); | |
485 | if ((value = convtime(arg)) == -1) | |
486 | fatal("%s line %d: invalid time value.", | |
487 | filename, linenum); | |
488 | if (*intptr == -1) | |
489 | *intptr = value; | |
490 | break; | |
491 | ||
492 | case sKeyRegenerationTime: | |
493 | intptr = &options->key_regeneration_time; | |
494 | goto parse_time; | |
495 | ||
496 | case sListenAddress: | |
497 | arg = strdelim(&cp); | |
498 | if (!arg || *arg == '\0' || strncmp(arg, "[]", 2) == 0) | |
499 | fatal("%s line %d: missing inet addr.", | |
500 | filename, linenum); | |
501 | if (*arg == '[') { | |
502 | if ((p = strchr(arg, ']')) == NULL) | |
503 | fatal("%s line %d: bad ipv6 inet addr usage.", | |
e2b1fb42 | 504 | filename, linenum); |
2717fa0f | 505 | arg++; |
506 | memmove(p, p+1, strlen(p+1)+1); | |
507 | } else if (((p = strchr(arg, ':')) == NULL) || | |
508 | (strchr(p+1, ':') != NULL)) { | |
509 | add_listen_addr(options, arg, 0); | |
e2b1fb42 | 510 | break; |
2717fa0f | 511 | } |
512 | if (*p == ':') { | |
513 | u_short port; | |
5260325f | 514 | |
2717fa0f | 515 | p++; |
516 | if (*p == '\0') | |
517 | fatal("%s line %d: bad inet addr:port usage.", | |
48e671d5 | 518 | filename, linenum); |
2717fa0f | 519 | else { |
520 | *(p-1) = '\0'; | |
521 | if ((port = a2port(p)) == 0) | |
522 | fatal("%s line %d: bad port number.", | |
d11c1288 | 523 | filename, linenum); |
2717fa0f | 524 | add_listen_addr(options, arg, port); |
d11c1288 | 525 | } |
2717fa0f | 526 | } else if (*p == '\0') |
527 | add_listen_addr(options, arg, 0); | |
528 | else | |
529 | fatal("%s line %d: bad inet addr usage.", | |
530 | filename, linenum); | |
531 | break; | |
532 | ||
533 | case sHostKeyFile: | |
534 | intptr = &options->num_host_key_files; | |
535 | if (*intptr >= MAX_HOSTKEYS) | |
536 | fatal("%s line %d: too many host keys specified (max %d).", | |
537 | filename, linenum, MAX_HOSTKEYS); | |
538 | charptr = &options->host_key_files[*intptr]; | |
fa649821 | 539 | parse_filename: |
2717fa0f | 540 | arg = strdelim(&cp); |
541 | if (!arg || *arg == '\0') | |
542 | fatal("%s line %d: missing file name.", | |
543 | filename, linenum); | |
544 | if (*charptr == NULL) { | |
545 | *charptr = tilde_expand_filename(arg, getuid()); | |
546 | /* increase optional counter */ | |
547 | if (intptr != NULL) | |
548 | *intptr = *intptr + 1; | |
549 | } | |
550 | break; | |
0fbe8c74 | 551 | |
2717fa0f | 552 | case sPidFile: |
553 | charptr = &options->pid_file; | |
554 | goto parse_filename; | |
5260325f | 555 | |
2717fa0f | 556 | case sPermitRootLogin: |
557 | intptr = &options->permit_root_login; | |
558 | arg = strdelim(&cp); | |
559 | if (!arg || *arg == '\0') | |
560 | fatal("%s line %d: missing yes/" | |
561 | "without-password/forced-commands-only/no " | |
562 | "argument.", filename, linenum); | |
563 | value = 0; /* silence compiler */ | |
564 | if (strcmp(arg, "without-password") == 0) | |
565 | value = PERMIT_NO_PASSWD; | |
566 | else if (strcmp(arg, "forced-commands-only") == 0) | |
567 | value = PERMIT_FORCED_ONLY; | |
568 | else if (strcmp(arg, "yes") == 0) | |
569 | value = PERMIT_YES; | |
570 | else if (strcmp(arg, "no") == 0) | |
571 | value = PERMIT_NO; | |
572 | else | |
573 | fatal("%s line %d: Bad yes/" | |
574 | "without-password/forced-commands-only/no " | |
575 | "argument: %s", filename, linenum, arg); | |
576 | if (*intptr == -1) | |
577 | *intptr = value; | |
578 | break; | |
579 | ||
580 | case sIgnoreRhosts: | |
581 | intptr = &options->ignore_rhosts; | |
5260325f | 582 | parse_flag: |
2717fa0f | 583 | arg = strdelim(&cp); |
584 | if (!arg || *arg == '\0') | |
585 | fatal("%s line %d: missing yes/no argument.", | |
586 | filename, linenum); | |
587 | value = 0; /* silence compiler */ | |
588 | if (strcmp(arg, "yes") == 0) | |
589 | value = 1; | |
590 | else if (strcmp(arg, "no") == 0) | |
591 | value = 0; | |
592 | else | |
593 | fatal("%s line %d: Bad yes/no argument: %s", | |
594 | filename, linenum, arg); | |
595 | if (*intptr == -1) | |
596 | *intptr = value; | |
597 | break; | |
598 | ||
599 | case sIgnoreUserKnownHosts: | |
600 | intptr = &options->ignore_user_known_hosts; | |
601 | goto parse_flag; | |
602 | ||
2717fa0f | 603 | case sRhostsRSAAuthentication: |
604 | intptr = &options->rhosts_rsa_authentication; | |
605 | goto parse_flag; | |
606 | ||
607 | case sHostbasedAuthentication: | |
608 | intptr = &options->hostbased_authentication; | |
609 | goto parse_flag; | |
610 | ||
611 | case sHostbasedUsesNameFromPacketOnly: | |
612 | intptr = &options->hostbased_uses_name_from_packet_only; | |
613 | goto parse_flag; | |
614 | ||
615 | case sRSAAuthentication: | |
616 | intptr = &options->rsa_authentication; | |
617 | goto parse_flag; | |
618 | ||
619 | case sPubkeyAuthentication: | |
620 | intptr = &options->pubkey_authentication; | |
621 | goto parse_flag; | |
d0ec7f42 | 622 | |
2717fa0f | 623 | case sKerberosAuthentication: |
624 | intptr = &options->kerberos_authentication; | |
625 | goto parse_flag; | |
5260325f | 626 | |
2717fa0f | 627 | case sKerberosOrLocalPasswd: |
628 | intptr = &options->kerberos_or_local_passwd; | |
629 | goto parse_flag; | |
5260325f | 630 | |
2717fa0f | 631 | case sKerberosTicketCleanup: |
632 | intptr = &options->kerberos_ticket_cleanup; | |
633 | goto parse_flag; | |
d0ec7f42 | 634 | |
2717fa0f | 635 | case sKerberosTgtPassing: |
636 | intptr = &options->kerberos_tgt_passing; | |
637 | goto parse_flag; | |
d0ec7f42 | 638 | |
7364bd04 | 639 | case sGssAuthentication: |
640 | intptr = &options->gss_authentication; | |
641 | goto parse_flag; | |
642 | ||
643 | case sGssCleanupCreds: | |
644 | intptr = &options->gss_cleanup_creds; | |
645 | goto parse_flag; | |
646 | ||
2717fa0f | 647 | case sPasswordAuthentication: |
648 | intptr = &options->password_authentication; | |
649 | goto parse_flag; | |
5260325f | 650 | |
2717fa0f | 651 | case sKbdInteractiveAuthentication: |
652 | intptr = &options->kbd_interactive_authentication; | |
653 | goto parse_flag; | |
8002af61 | 654 | |
2717fa0f | 655 | case sChallengeResponseAuthentication: |
656 | intptr = &options->challenge_response_authentication; | |
657 | goto parse_flag; | |
8002af61 | 658 | |
2717fa0f | 659 | case sPrintMotd: |
660 | intptr = &options->print_motd; | |
661 | goto parse_flag; | |
5260325f | 662 | |
2717fa0f | 663 | case sPrintLastLog: |
664 | intptr = &options->print_lastlog; | |
665 | goto parse_flag; | |
5260325f | 666 | |
2717fa0f | 667 | case sX11Forwarding: |
668 | intptr = &options->x11_forwarding; | |
669 | goto parse_flag; | |
5260325f | 670 | |
2717fa0f | 671 | case sX11DisplayOffset: |
672 | intptr = &options->x11_display_offset; | |
673 | goto parse_int; | |
8efc0c15 | 674 | |
e6e573bd | 675 | case sX11UseLocalhost: |
676 | intptr = &options->x11_use_localhost; | |
677 | goto parse_flag; | |
678 | ||
2717fa0f | 679 | case sXAuthLocation: |
680 | charptr = &options->xauth_location; | |
681 | goto parse_filename; | |
5260325f | 682 | |
2717fa0f | 683 | case sStrictModes: |
684 | intptr = &options->strict_modes; | |
685 | goto parse_flag; | |
5260325f | 686 | |
2717fa0f | 687 | case sKeepAlives: |
688 | intptr = &options->keepalives; | |
689 | goto parse_flag; | |
33de75a3 | 690 | |
2717fa0f | 691 | case sEmptyPasswd: |
692 | intptr = &options->permit_empty_passwd; | |
693 | goto parse_flag; | |
5260325f | 694 | |
f00bab84 | 695 | case sPermitUserEnvironment: |
696 | intptr = &options->permit_user_env; | |
697 | goto parse_flag; | |
698 | ||
2717fa0f | 699 | case sUseLogin: |
700 | intptr = &options->use_login; | |
701 | goto parse_flag; | |
5260325f | 702 | |
636f76ca | 703 | case sCompression: |
704 | intptr = &options->compression; | |
705 | goto parse_flag; | |
706 | ||
2717fa0f | 707 | case sGatewayPorts: |
708 | intptr = &options->gateway_ports; | |
709 | goto parse_flag; | |
5260325f | 710 | |
c5a7d788 | 711 | case sUseDNS: |
712 | intptr = &options->use_dns; | |
2717fa0f | 713 | goto parse_flag; |
5260325f | 714 | |
2717fa0f | 715 | case sLogFacility: |
716 | intptr = (int *) &options->log_facility; | |
717 | arg = strdelim(&cp); | |
718 | value = log_facility_number(arg); | |
5eaf8578 | 719 | if (value == SYSLOG_FACILITY_NOT_SET) |
2717fa0f | 720 | fatal("%.200s line %d: unsupported log facility '%s'", |
721 | filename, linenum, arg ? arg : "<NONE>"); | |
722 | if (*intptr == -1) | |
723 | *intptr = (SyslogFacility) value; | |
724 | break; | |
725 | ||
726 | case sLogLevel: | |
727 | intptr = (int *) &options->log_level; | |
728 | arg = strdelim(&cp); | |
729 | value = log_level_number(arg); | |
5eaf8578 | 730 | if (value == SYSLOG_LEVEL_NOT_SET) |
2717fa0f | 731 | fatal("%.200s line %d: unsupported log level '%s'", |
732 | filename, linenum, arg ? arg : "<NONE>"); | |
733 | if (*intptr == -1) | |
734 | *intptr = (LogLevel) value; | |
735 | break; | |
736 | ||
737 | case sAllowTcpForwarding: | |
738 | intptr = &options->allow_tcp_forwarding; | |
739 | goto parse_flag; | |
740 | ||
1853d1ef | 741 | case sUsePrivilegeSeparation: |
742 | intptr = &use_privsep; | |
743 | goto parse_flag; | |
744 | ||
2717fa0f | 745 | case sAllowUsers: |
746 | while ((arg = strdelim(&cp)) && *arg != '\0') { | |
747 | if (options->num_allow_users >= MAX_ALLOW_USERS) | |
748 | fatal("%s line %d: too many allow users.", | |
749 | filename, linenum); | |
7528d467 | 750 | options->allow_users[options->num_allow_users++] = |
751 | xstrdup(arg); | |
2717fa0f | 752 | } |
753 | break; | |
a8be9f80 | 754 | |
2717fa0f | 755 | case sDenyUsers: |
756 | while ((arg = strdelim(&cp)) && *arg != '\0') { | |
757 | if (options->num_deny_users >= MAX_DENY_USERS) | |
758 | fatal( "%s line %d: too many deny users.", | |
759 | filename, linenum); | |
7528d467 | 760 | options->deny_users[options->num_deny_users++] = |
761 | xstrdup(arg); | |
2717fa0f | 762 | } |
763 | break; | |
b2552997 | 764 | |
2717fa0f | 765 | case sAllowGroups: |
766 | while ((arg = strdelim(&cp)) && *arg != '\0') { | |
767 | if (options->num_allow_groups >= MAX_ALLOW_GROUPS) | |
768 | fatal("%s line %d: too many allow groups.", | |
769 | filename, linenum); | |
7528d467 | 770 | options->allow_groups[options->num_allow_groups++] = |
771 | xstrdup(arg); | |
2717fa0f | 772 | } |
773 | break; | |
a8be9f80 | 774 | |
2717fa0f | 775 | case sDenyGroups: |
776 | while ((arg = strdelim(&cp)) && *arg != '\0') { | |
777 | if (options->num_deny_groups >= MAX_DENY_GROUPS) | |
778 | fatal("%s line %d: too many deny groups.", | |
779 | filename, linenum); | |
780 | options->deny_groups[options->num_deny_groups++] = xstrdup(arg); | |
781 | } | |
782 | break; | |
38c295d6 | 783 | |
2717fa0f | 784 | case sCiphers: |
785 | arg = strdelim(&cp); | |
786 | if (!arg || *arg == '\0') | |
787 | fatal("%s line %d: Missing argument.", filename, linenum); | |
788 | if (!ciphers_valid(arg)) | |
789 | fatal("%s line %d: Bad SSH2 cipher spec '%s'.", | |
790 | filename, linenum, arg ? arg : "<NONE>"); | |
791 | if (options->ciphers == NULL) | |
792 | options->ciphers = xstrdup(arg); | |
793 | break; | |
794 | ||
795 | case sMacs: | |
796 | arg = strdelim(&cp); | |
797 | if (!arg || *arg == '\0') | |
798 | fatal("%s line %d: Missing argument.", filename, linenum); | |
799 | if (!mac_valid(arg)) | |
800 | fatal("%s line %d: Bad SSH2 mac spec '%s'.", | |
801 | filename, linenum, arg ? arg : "<NONE>"); | |
802 | if (options->macs == NULL) | |
803 | options->macs = xstrdup(arg); | |
804 | break; | |
805 | ||
806 | case sProtocol: | |
807 | intptr = &options->protocol; | |
808 | arg = strdelim(&cp); | |
809 | if (!arg || *arg == '\0') | |
810 | fatal("%s line %d: Missing argument.", filename, linenum); | |
811 | value = proto_spec(arg); | |
812 | if (value == SSH_PROTO_UNKNOWN) | |
813 | fatal("%s line %d: Bad protocol spec '%s'.", | |
184eed6a | 814 | filename, linenum, arg ? arg : "<NONE>"); |
2717fa0f | 815 | if (*intptr == SSH_PROTO_UNKNOWN) |
816 | *intptr = value; | |
817 | break; | |
818 | ||
819 | case sSubsystem: | |
820 | if (options->num_subsystems >= MAX_SUBSYSTEMS) { | |
821 | fatal("%s line %d: too many subsystems defined.", | |
184eed6a | 822 | filename, linenum); |
2717fa0f | 823 | } |
824 | arg = strdelim(&cp); | |
825 | if (!arg || *arg == '\0') | |
826 | fatal("%s line %d: Missing subsystem name.", | |
184eed6a | 827 | filename, linenum); |
2717fa0f | 828 | for (i = 0; i < options->num_subsystems; i++) |
829 | if (strcmp(arg, options->subsystem_name[i]) == 0) | |
830 | fatal("%s line %d: Subsystem '%s' already defined.", | |
184eed6a | 831 | filename, linenum, arg); |
2717fa0f | 832 | options->subsystem_name[options->num_subsystems] = xstrdup(arg); |
833 | arg = strdelim(&cp); | |
834 | if (!arg || *arg == '\0') | |
835 | fatal("%s line %d: Missing subsystem command.", | |
184eed6a | 836 | filename, linenum); |
2717fa0f | 837 | options->subsystem_command[options->num_subsystems] = xstrdup(arg); |
838 | options->num_subsystems++; | |
839 | break; | |
840 | ||
841 | case sMaxStartups: | |
842 | arg = strdelim(&cp); | |
843 | if (!arg || *arg == '\0') | |
844 | fatal("%s line %d: Missing MaxStartups spec.", | |
184eed6a | 845 | filename, linenum); |
2717fa0f | 846 | if ((n = sscanf(arg, "%d:%d:%d", |
847 | &options->max_startups_begin, | |
848 | &options->max_startups_rate, | |
849 | &options->max_startups)) == 3) { | |
850 | if (options->max_startups_begin > | |
851 | options->max_startups || | |
852 | options->max_startups_rate > 100 || | |
853 | options->max_startups_rate < 1) | |
c345cf9d | 854 | fatal("%s line %d: Illegal MaxStartups spec.", |
97de229c | 855 | filename, linenum); |
2717fa0f | 856 | } else if (n != 1) |
857 | fatal("%s line %d: Illegal MaxStartups spec.", | |
858 | filename, linenum); | |
859 | else | |
860 | options->max_startups = options->max_startups_begin; | |
861 | break; | |
862 | ||
863 | case sBanner: | |
864 | charptr = &options->banner; | |
865 | goto parse_filename; | |
866 | /* | |
867 | * These options can contain %X options expanded at | |
868 | * connect time, so that you can specify paths like: | |
869 | * | |
870 | * AuthorizedKeysFile /etc/ssh_keys/%u | |
871 | */ | |
872 | case sAuthorizedKeysFile: | |
873 | case sAuthorizedKeysFile2: | |
874 | charptr = (opcode == sAuthorizedKeysFile ) ? | |
875 | &options->authorized_keys_file : | |
876 | &options->authorized_keys_file2; | |
877 | goto parse_filename; | |
878 | ||
879 | case sClientAliveInterval: | |
880 | intptr = &options->client_alive_interval; | |
881 | goto parse_time; | |
882 | ||
883 | case sClientAliveCountMax: | |
884 | intptr = &options->client_alive_count_max; | |
885 | goto parse_int; | |
886 | ||
887 | case sDeprecated: | |
bbe88b6d | 888 | logit("%s line %d: Deprecated option %s", |
2717fa0f | 889 | filename, linenum, arg); |
890 | while (arg) | |
891 | arg = strdelim(&cp); | |
892 | break; | |
893 | ||
a2144546 | 894 | case sUnsupported: |
895 | logit("%s line %d: Unsupported option %s", | |
896 | filename, linenum, arg); | |
897 | while (arg) | |
898 | arg = strdelim(&cp); | |
899 | break; | |
900 | ||
2717fa0f | 901 | default: |
902 | fatal("%s line %d: Missing handler for opcode %s (%d)", | |
903 | filename, linenum, arg, opcode); | |
904 | } | |
905 | if ((arg = strdelim(&cp)) != NULL && *arg != '\0') | |
906 | fatal("%s line %d: garbage at end of line; \"%.200s\".", | |
907 | filename, linenum, arg); | |
908 | return 0; | |
909 | } | |
089fbbd2 | 910 | |
2717fa0f | 911 | /* Reads the server configuration file. */ |
5c53a31e | 912 | |
2717fa0f | 913 | void |
914 | read_server_config(ServerOptions *options, const char *filename) | |
915 | { | |
7528d467 | 916 | int linenum, bad_options = 0; |
2717fa0f | 917 | char line[1024]; |
7528d467 | 918 | FILE *f; |
2717fa0f | 919 | |
34934506 | 920 | debug2("read_server_config: filename %s", filename); |
2717fa0f | 921 | f = fopen(filename, "r"); |
922 | if (!f) { | |
923 | perror(filename); | |
924 | exit(1); | |
925 | } | |
926 | linenum = 0; | |
927 | while (fgets(line, sizeof(line), f)) { | |
928 | /* Update line number counter. */ | |
929 | linenum++; | |
930 | if (process_server_config_line(options, line, filename, linenum) != 0) | |
931 | bad_options++; | |
8efc0c15 | 932 | } |
5260325f | 933 | fclose(f); |
b7c70970 | 934 | if (bad_options > 0) |
935 | fatal("%s: terminating, %d bad configuration options", | |
936 | filename, bad_options); | |
8efc0c15 | 937 | } |