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9108f8d9 | 1 | /* $OpenBSD: servconf.c,v 1.165 2006/08/14 12:40:25 dtucker Exp $ */ |
3c0ef626 | 2 | /* |
3 | * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland | |
4 | * All rights reserved | |
5 | * | |
6 | * As far as I am concerned, the code I have written for this software | |
7 | * can be used freely for any purpose. Any derived versions of this | |
8 | * software must be clearly marked as such, and if the derived work is | |
9 | * incompatible with the protocol description in the RFC file, it must be | |
10 | * called by a name other than "ssh" or "Secure Shell". | |
11 | */ | |
12 | ||
13 | #include "includes.h" | |
3c0ef626 | 14 | |
9108f8d9 | 15 | #include <sys/types.h> |
16 | #include <sys/socket.h> | |
17 | ||
18 | #include <netdb.h> | |
19 | #include <pwd.h> | |
20 | #include <stdio.h> | |
21 | #include <stdlib.h> | |
22 | #include <string.h> | |
23 | #include <signal.h> | |
24 | #include <unistd.h> | |
25 | #include <stdarg.h> | |
26 | ||
27 | #include "xmalloc.h" | |
3c0ef626 | 28 | #include "ssh.h" |
29 | #include "log.h" | |
9108f8d9 | 30 | #include "buffer.h" |
3c0ef626 | 31 | #include "servconf.h" |
3c0ef626 | 32 | #include "compat.h" |
33 | #include "pathnames.h" | |
3c0ef626 | 34 | #include "misc.h" |
35 | #include "cipher.h" | |
9108f8d9 | 36 | #include "key.h" |
3c0ef626 | 37 | #include "kex.h" |
38 | #include "mac.h" | |
9108f8d9 | 39 | #include "match.h" |
40 | #include "channels.h" | |
41 | #include "groupaccess.h" | |
3c0ef626 | 42 | |
43 | static void add_listen_addr(ServerOptions *, char *, u_short); | |
44 | static void add_one_listen_addr(ServerOptions *, char *, u_short); | |
45 | ||
700318f3 | 46 | /* Use of privilege separation or not */ |
47 | extern int use_privsep; | |
9108f8d9 | 48 | extern Buffer cfg; |
3c0ef626 | 49 | |
50 | /* Initializes the server options to their default values. */ | |
51 | ||
52 | void | |
53 | initialize_server_options(ServerOptions *options) | |
54 | { | |
55 | memset(options, 0, sizeof(*options)); | |
56 | ||
57 | /* Portable-specific options */ | |
0fff78ff | 58 | options->use_pam = -1; |
3c0ef626 | 59 | |
60 | /* Standard Options */ | |
61 | options->num_ports = 0; | |
62 | options->ports_from_cmdline = 0; | |
63 | options->listen_addrs = NULL; | |
996d5e62 | 64 | options->address_family = -1; |
3c0ef626 | 65 | options->num_host_key_files = 0; |
66 | options->pid_file = NULL; | |
67 | options->server_key_bits = -1; | |
68 | options->login_grace_time = -1; | |
69 | options->key_regeneration_time = -1; | |
70 | options->permit_root_login = PERMIT_NOT_SET; | |
71 | options->ignore_rhosts = -1; | |
72 | options->ignore_user_known_hosts = -1; | |
73 | options->print_motd = -1; | |
74 | options->print_lastlog = -1; | |
75 | options->x11_forwarding = -1; | |
76 | options->x11_display_offset = -1; | |
e9a17296 | 77 | options->x11_use_localhost = -1; |
3c0ef626 | 78 | options->xauth_location = NULL; |
79 | options->strict_modes = -1; | |
cdd66111 | 80 | options->tcp_keep_alive = -1; |
e9a17296 | 81 | options->log_facility = SYSLOG_FACILITY_NOT_SET; |
82 | options->log_level = SYSLOG_LEVEL_NOT_SET; | |
3c0ef626 | 83 | options->rhosts_rsa_authentication = -1; |
84 | options->hostbased_authentication = -1; | |
85 | options->hostbased_uses_name_from_packet_only = -1; | |
86 | options->rsa_authentication = -1; | |
87 | options->pubkey_authentication = -1; | |
3c0ef626 | 88 | options->kerberos_authentication = -1; |
89 | options->kerberos_or_local_passwd = -1; | |
90 | options->kerberos_ticket_cleanup = -1; | |
cdd66111 | 91 | options->kerberos_get_afs_token = -1; |
0fff78ff | 92 | options->gss_authentication=-1; |
659bdb8e | 93 | options->gss_keyex = -1; |
0fff78ff | 94 | options->gss_cleanup_creds = -1; |
659bdb8e | 95 | options->gss_strict_acceptor = -1; |
3c0ef626 | 96 | options->password_authentication = -1; |
97 | options->kbd_interactive_authentication = -1; | |
98 | options->challenge_response_authentication = -1; | |
99 | options->permit_empty_passwd = -1; | |
41b2f314 | 100 | options->permit_user_env = -1; |
3c0ef626 | 101 | options->use_login = -1; |
f5799ae1 | 102 | options->compression = -1; |
3c0ef626 | 103 | options->allow_tcp_forwarding = -1; |
104 | options->num_allow_users = 0; | |
105 | options->num_deny_users = 0; | |
106 | options->num_allow_groups = 0; | |
107 | options->num_deny_groups = 0; | |
108 | options->ciphers = NULL; | |
109 | options->macs = NULL; | |
110 | options->protocol = SSH_PROTO_UNKNOWN; | |
111 | options->gateway_ports = -1; | |
112 | options->num_subsystems = 0; | |
113 | options->max_startups_begin = -1; | |
114 | options->max_startups_rate = -1; | |
115 | options->max_startups = -1; | |
c9f39d2c | 116 | options->max_authtries = -1; |
3c0ef626 | 117 | options->banner = NULL; |
0fff78ff | 118 | options->use_dns = -1; |
3c0ef626 | 119 | options->client_alive_interval = -1; |
120 | options->client_alive_count_max = -1; | |
121 | options->authorized_keys_file = NULL; | |
122 | options->authorized_keys_file2 = NULL; | |
c9f39d2c | 123 | options->num_accept_env = 0; |
2c06c99b | 124 | options->permit_tun = -1; |
9108f8d9 | 125 | options->num_permitted_opens = -1; |
126 | options->adm_forced_command = NULL; | |
bed7ee6f | 127 | options->none_enabled = -1; |
128 | options->tcp_rcv_buf_poll = -1; | |
129 | options->hpn_disabled = -1; | |
130 | options->hpn_buffer_size = -1; | |
3c0ef626 | 131 | } |
132 | ||
133 | void | |
134 | fill_default_server_options(ServerOptions *options) | |
135 | { | |
bed7ee6f | 136 | |
3c0ef626 | 137 | /* Portable-specific options */ |
0fff78ff | 138 | if (options->use_pam == -1) |
acc3d05e | 139 | options->use_pam = 0; |
3c0ef626 | 140 | |
141 | /* Standard Options */ | |
142 | if (options->protocol == SSH_PROTO_UNKNOWN) | |
143 | options->protocol = SSH_PROTO_1|SSH_PROTO_2; | |
144 | if (options->num_host_key_files == 0) { | |
145 | /* fill default hostkeys for protocols */ | |
146 | if (options->protocol & SSH_PROTO_1) | |
e9a17296 | 147 | options->host_key_files[options->num_host_key_files++] = |
148 | _PATH_HOST_KEY_FILE; | |
149 | if (options->protocol & SSH_PROTO_2) { | |
150 | options->host_key_files[options->num_host_key_files++] = | |
151 | _PATH_HOST_RSA_KEY_FILE; | |
152 | options->host_key_files[options->num_host_key_files++] = | |
153 | _PATH_HOST_DSA_KEY_FILE; | |
154 | } | |
3c0ef626 | 155 | } |
156 | if (options->num_ports == 0) | |
157 | options->ports[options->num_ports++] = SSH_DEFAULT_PORT; | |
158 | if (options->listen_addrs == NULL) | |
159 | add_listen_addr(options, NULL, 0); | |
160 | if (options->pid_file == NULL) | |
161 | options->pid_file = _PATH_SSH_DAEMON_PID_FILE; | |
162 | if (options->server_key_bits == -1) | |
163 | options->server_key_bits = 768; | |
164 | if (options->login_grace_time == -1) | |
41b2f314 | 165 | options->login_grace_time = 120; |
3c0ef626 | 166 | if (options->key_regeneration_time == -1) |
167 | options->key_regeneration_time = 3600; | |
168 | if (options->permit_root_login == PERMIT_NOT_SET) | |
169 | options->permit_root_login = PERMIT_YES; | |
170 | if (options->ignore_rhosts == -1) | |
171 | options->ignore_rhosts = 1; | |
172 | if (options->ignore_user_known_hosts == -1) | |
173 | options->ignore_user_known_hosts = 0; | |
174 | if (options->print_motd == -1) | |
175 | options->print_motd = 1; | |
176 | if (options->print_lastlog == -1) | |
177 | options->print_lastlog = 1; | |
178 | if (options->x11_forwarding == -1) | |
179 | options->x11_forwarding = 0; | |
180 | if (options->x11_display_offset == -1) | |
181 | options->x11_display_offset = 10; | |
e9a17296 | 182 | if (options->x11_use_localhost == -1) |
183 | options->x11_use_localhost = 1; | |
3c0ef626 | 184 | if (options->xauth_location == NULL) |
185 | options->xauth_location = _PATH_XAUTH; | |
3c0ef626 | 186 | if (options->strict_modes == -1) |
187 | options->strict_modes = 1; | |
cdd66111 | 188 | if (options->tcp_keep_alive == -1) |
189 | options->tcp_keep_alive = 1; | |
e9a17296 | 190 | if (options->log_facility == SYSLOG_FACILITY_NOT_SET) |
3c0ef626 | 191 | options->log_facility = SYSLOG_FACILITY_AUTH; |
e9a17296 | 192 | if (options->log_level == SYSLOG_LEVEL_NOT_SET) |
3c0ef626 | 193 | options->log_level = SYSLOG_LEVEL_INFO; |
3c0ef626 | 194 | if (options->rhosts_rsa_authentication == -1) |
195 | options->rhosts_rsa_authentication = 0; | |
196 | if (options->hostbased_authentication == -1) | |
197 | options->hostbased_authentication = 0; | |
198 | if (options->hostbased_uses_name_from_packet_only == -1) | |
199 | options->hostbased_uses_name_from_packet_only = 0; | |
200 | if (options->rsa_authentication == -1) | |
201 | options->rsa_authentication = 1; | |
202 | if (options->pubkey_authentication == -1) | |
203 | options->pubkey_authentication = 1; | |
3c0ef626 | 204 | if (options->kerberos_authentication == -1) |
700318f3 | 205 | options->kerberos_authentication = 0; |
3c0ef626 | 206 | if (options->kerberos_or_local_passwd == -1) |
207 | options->kerberos_or_local_passwd = 1; | |
208 | if (options->kerberos_ticket_cleanup == -1) | |
209 | options->kerberos_ticket_cleanup = 1; | |
cdd66111 | 210 | if (options->kerberos_get_afs_token == -1) |
211 | options->kerberos_get_afs_token = 0; | |
0fff78ff | 212 | if (options->gss_authentication == -1) |
213 | options->gss_authentication = 0; | |
659bdb8e | 214 | if (options->gss_keyex == -1) |
215 | options->gss_keyex = 0; | |
0fff78ff | 216 | if (options->gss_cleanup_creds == -1) |
217 | options->gss_cleanup_creds = 1; | |
659bdb8e | 218 | if (options->gss_strict_acceptor == -1) |
219 | options->gss_strict_acceptor = 0; | |
3c0ef626 | 220 | if (options->password_authentication == -1) |
221 | options->password_authentication = 1; | |
222 | if (options->kbd_interactive_authentication == -1) | |
223 | options->kbd_interactive_authentication = 0; | |
224 | if (options->challenge_response_authentication == -1) | |
225 | options->challenge_response_authentication = 1; | |
226 | if (options->permit_empty_passwd == -1) | |
227 | options->permit_empty_passwd = 0; | |
41b2f314 | 228 | if (options->permit_user_env == -1) |
229 | options->permit_user_env = 0; | |
3c0ef626 | 230 | if (options->use_login == -1) |
231 | options->use_login = 0; | |
f5799ae1 | 232 | if (options->compression == -1) |
665a873d | 233 | options->compression = COMP_DELAYED; |
3c0ef626 | 234 | if (options->allow_tcp_forwarding == -1) |
235 | options->allow_tcp_forwarding = 1; | |
236 | if (options->gateway_ports == -1) | |
237 | options->gateway_ports = 0; | |
238 | if (options->max_startups == -1) | |
239 | options->max_startups = 10; | |
240 | if (options->max_startups_rate == -1) | |
241 | options->max_startups_rate = 100; /* 100% */ | |
242 | if (options->max_startups_begin == -1) | |
243 | options->max_startups_begin = options->max_startups; | |
c9f39d2c | 244 | if (options->max_authtries == -1) |
245 | options->max_authtries = DEFAULT_AUTH_FAIL_MAX; | |
0fff78ff | 246 | if (options->use_dns == -1) |
247 | options->use_dns = 1; | |
3c0ef626 | 248 | if (options->client_alive_interval == -1) |
e9a17296 | 249 | options->client_alive_interval = 0; |
3c0ef626 | 250 | if (options->client_alive_count_max == -1) |
251 | options->client_alive_count_max = 3; | |
252 | if (options->authorized_keys_file2 == NULL) { | |
253 | /* authorized_keys_file2 falls back to authorized_keys_file */ | |
254 | if (options->authorized_keys_file != NULL) | |
255 | options->authorized_keys_file2 = options->authorized_keys_file; | |
256 | else | |
257 | options->authorized_keys_file2 = _PATH_SSH_USER_PERMITTED_KEYS2; | |
258 | } | |
259 | if (options->authorized_keys_file == NULL) | |
260 | options->authorized_keys_file = _PATH_SSH_USER_PERMITTED_KEYS; | |
2c06c99b | 261 | if (options->permit_tun == -1) |
262 | options->permit_tun = SSH_TUNMODE_NO; | |
700318f3 | 263 | |
bed7ee6f | 264 | if (options->hpn_disabled == -1) |
265 | options->hpn_disabled = 0; | |
266 | ||
267 | if (options->hpn_buffer_size == -1) | |
268 | options->hpn_buffer_size = 2*1024*1024; | |
269 | else { | |
270 | if (options->hpn_buffer_size == 0) | |
271 | options->hpn_buffer_size = 1; | |
272 | /* limit the maximum buffer to 7MB */ | |
273 | if (options->hpn_buffer_size > 7168) | |
274 | options->hpn_buffer_size = 7168; | |
275 | options->hpn_buffer_size *=1024; | |
276 | } | |
277 | ||
f5799ae1 | 278 | /* Turn privilege separation on by default */ |
700318f3 | 279 | if (use_privsep == -1) |
f5799ae1 | 280 | use_privsep = 1; |
281 | ||
bed7ee6f | 282 | |
283 | ||
41b2f314 | 284 | #ifndef HAVE_MMAP |
f5799ae1 | 285 | if (use_privsep && options->compression == 1) { |
286 | error("This platform does not support both privilege " | |
287 | "separation and compression"); | |
288 | error("Compression disabled"); | |
289 | options->compression = 0; | |
290 | } | |
291 | #endif | |
292 | ||
3c0ef626 | 293 | } |
294 | ||
295 | /* Keyword tokens. */ | |
296 | typedef enum { | |
297 | sBadOption, /* == unknown option */ | |
298 | /* Portable-specific options */ | |
0fff78ff | 299 | sUsePAM, |
3c0ef626 | 300 | /* Standard Options */ |
301 | sPort, sHostKeyFile, sServerKeyBits, sLoginGraceTime, sKeyRegenerationTime, | |
302 | sPermitRootLogin, sLogFacility, sLogLevel, | |
0fff78ff | 303 | sRhostsRSAAuthentication, sRSAAuthentication, |
3c0ef626 | 304 | sKerberosAuthentication, sKerberosOrLocalPasswd, sKerberosTicketCleanup, |
cdd66111 | 305 | sKerberosGetAFSToken, |
0fff78ff | 306 | sKerberosTgtPassing, sChallengeResponseAuthentication, |
996d5e62 | 307 | sPasswordAuthentication, sKbdInteractiveAuthentication, |
308 | sListenAddress, sAddressFamily, | |
3c0ef626 | 309 | sPrintMotd, sPrintLastLog, sIgnoreRhosts, |
e9a17296 | 310 | sX11Forwarding, sX11DisplayOffset, sX11UseLocalhost, |
cdd66111 | 311 | sStrictModes, sEmptyPasswd, sTCPKeepAlive, |
41b2f314 | 312 | sPermitUserEnvironment, sUseLogin, sAllowTcpForwarding, sCompression, |
3c0ef626 | 313 | sAllowUsers, sDenyUsers, sAllowGroups, sDenyGroups, |
314 | sIgnoreUserKnownHosts, sCiphers, sMacs, sProtocol, sPidFile, | |
c9f39d2c | 315 | sGatewayPorts, sPubkeyAuthentication, sXAuthLocation, sSubsystem, |
316 | sMaxStartups, sMaxAuthTries, | |
0fff78ff | 317 | sBanner, sUseDNS, sHostbasedAuthentication, |
e9a17296 | 318 | sHostbasedUsesNameFromPacketOnly, sClientAliveInterval, |
3c0ef626 | 319 | sClientAliveCountMax, sAuthorizedKeysFile, sAuthorizedKeysFile2, |
659bdb8e | 320 | sGssAuthentication, sGssCleanupCreds, sGssStrictAcceptor, |
321 | sGssKeyEx, | |
322 | sAcceptEnv, sPermitTunnel, | |
9108f8d9 | 323 | sMatch, sPermitOpen, sForceCommand, |
bed7ee6f | 324 | sUsePrivilegeSeparation, sNoneEnabled, sTcpRcvBufPoll, |
325 | sHPNDisabled, sHPNBufferSize, | |
0fff78ff | 326 | sDeprecated, sUnsupported |
3c0ef626 | 327 | } ServerOpCodes; |
328 | ||
9108f8d9 | 329 | #define SSHCFG_GLOBAL 0x01 /* allowed in main section of sshd_config */ |
330 | #define SSHCFG_MATCH 0x02 /* allowed inside a Match section */ | |
331 | #define SSHCFG_ALL (SSHCFG_GLOBAL|SSHCFG_MATCH) | |
332 | ||
3c0ef626 | 333 | /* Textual representation of the tokens. */ |
334 | static struct { | |
335 | const char *name; | |
336 | ServerOpCodes opcode; | |
9108f8d9 | 337 | u_int flags; |
3c0ef626 | 338 | } keywords[] = { |
339 | /* Portable-specific options */ | |
0fff78ff | 340 | #ifdef USE_PAM |
9108f8d9 | 341 | { "usepam", sUsePAM, SSHCFG_GLOBAL }, |
0fff78ff | 342 | #else |
9108f8d9 | 343 | { "usepam", sUnsupported, SSHCFG_GLOBAL }, |
0fff78ff | 344 | #endif |
9108f8d9 | 345 | { "pamauthenticationviakbdint", sDeprecated, SSHCFG_GLOBAL }, |
3c0ef626 | 346 | /* Standard Options */ |
9108f8d9 | 347 | { "port", sPort, SSHCFG_GLOBAL }, |
348 | { "hostkey", sHostKeyFile, SSHCFG_GLOBAL }, | |
349 | { "hostdsakey", sHostKeyFile, SSHCFG_GLOBAL }, /* alias */ | |
350 | { "pidfile", sPidFile, SSHCFG_GLOBAL }, | |
351 | { "serverkeybits", sServerKeyBits, SSHCFG_GLOBAL }, | |
352 | { "logingracetime", sLoginGraceTime, SSHCFG_GLOBAL }, | |
353 | { "keyregenerationinterval", sKeyRegenerationTime, SSHCFG_GLOBAL }, | |
354 | { "permitrootlogin", sPermitRootLogin, SSHCFG_GLOBAL }, | |
355 | { "syslogfacility", sLogFacility, SSHCFG_GLOBAL }, | |
356 | { "loglevel", sLogLevel, SSHCFG_GLOBAL }, | |
357 | { "rhostsauthentication", sDeprecated, SSHCFG_GLOBAL }, | |
358 | { "rhostsrsaauthentication", sRhostsRSAAuthentication, SSHCFG_GLOBAL }, | |
359 | { "hostbasedauthentication", sHostbasedAuthentication, SSHCFG_GLOBAL }, | |
360 | { "hostbasedusesnamefrompacketonly", sHostbasedUsesNameFromPacketOnly, SSHCFG_GLOBAL }, | |
361 | { "rsaauthentication", sRSAAuthentication, SSHCFG_GLOBAL }, | |
362 | { "pubkeyauthentication", sPubkeyAuthentication, SSHCFG_GLOBAL }, | |
363 | { "dsaauthentication", sPubkeyAuthentication, SSHCFG_GLOBAL }, /* alias */ | |
0fff78ff | 364 | #ifdef KRB5 |
9108f8d9 | 365 | { "kerberosauthentication", sKerberosAuthentication, SSHCFG_GLOBAL }, |
366 | { "kerberosorlocalpasswd", sKerberosOrLocalPasswd, SSHCFG_GLOBAL }, | |
367 | { "kerberosticketcleanup", sKerberosTicketCleanup, SSHCFG_GLOBAL }, | |
cdd66111 | 368 | #ifdef USE_AFS |
9108f8d9 | 369 | { "kerberosgetafstoken", sKerberosGetAFSToken, SSHCFG_GLOBAL }, |
cdd66111 | 370 | #else |
9108f8d9 | 371 | { "kerberosgetafstoken", sUnsupported, SSHCFG_GLOBAL }, |
cdd66111 | 372 | #endif |
0fff78ff | 373 | #else |
9108f8d9 | 374 | { "kerberosauthentication", sUnsupported, SSHCFG_GLOBAL }, |
375 | { "kerberosorlocalpasswd", sUnsupported, SSHCFG_GLOBAL }, | |
376 | { "kerberosticketcleanup", sUnsupported, SSHCFG_GLOBAL }, | |
377 | { "kerberosgetafstoken", sUnsupported, SSHCFG_GLOBAL }, | |
3c0ef626 | 378 | #endif |
9108f8d9 | 379 | { "kerberostgtpassing", sUnsupported, SSHCFG_GLOBAL }, |
380 | { "afstokenpassing", sUnsupported, SSHCFG_GLOBAL }, | |
0fff78ff | 381 | #ifdef GSSAPI |
9108f8d9 | 382 | { "gssapiauthentication", sGssAuthentication, SSHCFG_GLOBAL }, |
383 | { "gssapicleanupcredentials", sGssCleanupCreds, SSHCFG_GLOBAL }, | |
659bdb8e | 384 | { "gssapistrictacceptorcheck", sGssStrictAcceptor, SSHCFG_GLOBAL }, |
385 | { "gssapikeyexchange", sGssKeyEx, SSHCFG_GLOBAL }, | |
0fff78ff | 386 | #else |
9108f8d9 | 387 | { "gssapiauthentication", sUnsupported, SSHCFG_GLOBAL }, |
388 | { "gssapicleanupcredentials", sUnsupported, SSHCFG_GLOBAL }, | |
659bdb8e | 389 | { "gssapistrictacceptorcheck", sUnsupported, SSHCFG_GLOBAL }, |
390 | { "gssapikeyexchange", sUnsupported, SSHCFG_GLOBAL }, | |
3c0ef626 | 391 | #endif |
9108f8d9 | 392 | { "passwordauthentication", sPasswordAuthentication, SSHCFG_GLOBAL }, |
393 | { "kbdinteractiveauthentication", sKbdInteractiveAuthentication, SSHCFG_GLOBAL }, | |
394 | { "challengeresponseauthentication", sChallengeResponseAuthentication, SSHCFG_GLOBAL }, | |
395 | { "skeyauthentication", sChallengeResponseAuthentication, SSHCFG_GLOBAL }, /* alias */ | |
396 | { "checkmail", sDeprecated, SSHCFG_GLOBAL }, | |
397 | { "listenaddress", sListenAddress, SSHCFG_GLOBAL }, | |
398 | { "addressfamily", sAddressFamily, SSHCFG_GLOBAL }, | |
399 | { "printmotd", sPrintMotd, SSHCFG_GLOBAL }, | |
400 | { "printlastlog", sPrintLastLog, SSHCFG_GLOBAL }, | |
401 | { "ignorerhosts", sIgnoreRhosts, SSHCFG_GLOBAL }, | |
402 | { "ignoreuserknownhosts", sIgnoreUserKnownHosts, SSHCFG_GLOBAL }, | |
403 | { "x11forwarding", sX11Forwarding, SSHCFG_ALL }, | |
404 | { "x11displayoffset", sX11DisplayOffset, SSHCFG_ALL }, | |
405 | { "x11uselocalhost", sX11UseLocalhost, SSHCFG_ALL }, | |
406 | { "xauthlocation", sXAuthLocation, SSHCFG_GLOBAL }, | |
407 | { "strictmodes", sStrictModes, SSHCFG_GLOBAL }, | |
408 | { "permitemptypasswords", sEmptyPasswd, SSHCFG_GLOBAL }, | |
409 | { "permituserenvironment", sPermitUserEnvironment, SSHCFG_GLOBAL }, | |
410 | { "uselogin", sUseLogin, SSHCFG_GLOBAL }, | |
411 | { "compression", sCompression, SSHCFG_GLOBAL }, | |
412 | { "tcpkeepalive", sTCPKeepAlive, SSHCFG_GLOBAL }, | |
413 | { "keepalive", sTCPKeepAlive, SSHCFG_GLOBAL }, /* obsolete alias */ | |
414 | { "allowtcpforwarding", sAllowTcpForwarding, SSHCFG_ALL }, | |
415 | { "allowusers", sAllowUsers, SSHCFG_GLOBAL }, | |
416 | { "denyusers", sDenyUsers, SSHCFG_GLOBAL }, | |
417 | { "allowgroups", sAllowGroups, SSHCFG_GLOBAL }, | |
418 | { "denygroups", sDenyGroups, SSHCFG_GLOBAL }, | |
419 | { "ciphers", sCiphers, SSHCFG_GLOBAL }, | |
420 | { "macs", sMacs, SSHCFG_GLOBAL }, | |
421 | { "protocol", sProtocol, SSHCFG_GLOBAL }, | |
422 | { "gatewayports", sGatewayPorts, SSHCFG_ALL }, | |
423 | { "subsystem", sSubsystem, SSHCFG_GLOBAL }, | |
424 | { "maxstartups", sMaxStartups, SSHCFG_GLOBAL }, | |
425 | { "maxauthtries", sMaxAuthTries, SSHCFG_GLOBAL }, | |
426 | { "banner", sBanner, SSHCFG_GLOBAL }, | |
427 | { "usedns", sUseDNS, SSHCFG_GLOBAL }, | |
428 | { "verifyreversemapping", sDeprecated, SSHCFG_GLOBAL }, | |
429 | { "reversemappingcheck", sDeprecated, SSHCFG_GLOBAL }, | |
430 | { "clientaliveinterval", sClientAliveInterval, SSHCFG_GLOBAL }, | |
431 | { "clientalivecountmax", sClientAliveCountMax, SSHCFG_GLOBAL }, | |
432 | { "authorizedkeysfile", sAuthorizedKeysFile, SSHCFG_GLOBAL }, | |
433 | { "authorizedkeysfile2", sAuthorizedKeysFile2, SSHCFG_GLOBAL }, | |
434 | { "useprivilegeseparation", sUsePrivilegeSeparation, SSHCFG_GLOBAL }, | |
435 | { "acceptenv", sAcceptEnv, SSHCFG_GLOBAL }, | |
436 | { "permittunnel", sPermitTunnel, SSHCFG_GLOBAL }, | |
437 | { "match", sMatch, SSHCFG_ALL }, | |
438 | { "permitopen", sPermitOpen, SSHCFG_ALL }, | |
439 | { "forcecommand", sForceCommand, SSHCFG_ALL }, | |
bed7ee6f | 440 | { "noneenabled", sNoneEnabled }, |
441 | { "hpndisabled", sHPNDisabled }, | |
442 | { "hpnbuffersize", sHPNBufferSize }, | |
443 | { "tcprcvbufpoll", sTcpRcvBufPoll }, | |
9108f8d9 | 444 | { NULL, sBadOption, 0 } |
3c0ef626 | 445 | }; |
446 | ||
447 | /* | |
448 | * Returns the number of the token pointed to by cp or sBadOption. | |
449 | */ | |
450 | ||
451 | static ServerOpCodes | |
452 | parse_token(const char *cp, const char *filename, | |
9108f8d9 | 453 | int linenum, u_int *flags) |
3c0ef626 | 454 | { |
455 | u_int i; | |
456 | ||
457 | for (i = 0; keywords[i].name; i++) | |
9108f8d9 | 458 | if (strcasecmp(cp, keywords[i].name) == 0) { |
bed7ee6f | 459 | debug ("Config token is %s", keywords[i].name); |
9108f8d9 | 460 | *flags = keywords[i].flags; |
3c0ef626 | 461 | return keywords[i].opcode; |
9108f8d9 | 462 | } |
3c0ef626 | 463 | |
464 | error("%s: line %d: Bad configuration option: %s", | |
465 | filename, linenum, cp); | |
466 | return sBadOption; | |
467 | } | |
468 | ||
469 | static void | |
470 | add_listen_addr(ServerOptions *options, char *addr, u_short port) | |
471 | { | |
665a873d | 472 | u_int i; |
3c0ef626 | 473 | |
474 | if (options->num_ports == 0) | |
475 | options->ports[options->num_ports++] = SSH_DEFAULT_PORT; | |
996d5e62 | 476 | if (options->address_family == -1) |
477 | options->address_family = AF_UNSPEC; | |
3c0ef626 | 478 | if (port == 0) |
479 | for (i = 0; i < options->num_ports; i++) | |
480 | add_one_listen_addr(options, addr, options->ports[i]); | |
481 | else | |
482 | add_one_listen_addr(options, addr, port); | |
483 | } | |
484 | ||
485 | static void | |
486 | add_one_listen_addr(ServerOptions *options, char *addr, u_short port) | |
487 | { | |
488 | struct addrinfo hints, *ai, *aitop; | |
489 | char strport[NI_MAXSERV]; | |
490 | int gaierr; | |
491 | ||
492 | memset(&hints, 0, sizeof(hints)); | |
996d5e62 | 493 | hints.ai_family = options->address_family; |
3c0ef626 | 494 | hints.ai_socktype = SOCK_STREAM; |
495 | hints.ai_flags = (addr == NULL) ? AI_PASSIVE : 0; | |
680cee3b | 496 | snprintf(strport, sizeof strport, "%u", port); |
3c0ef626 | 497 | if ((gaierr = getaddrinfo(addr, strport, &hints, &aitop)) != 0) |
498 | fatal("bad addr or host: %s (%s)", | |
499 | addr ? addr : "<NULL>", | |
500 | gai_strerror(gaierr)); | |
501 | for (ai = aitop; ai->ai_next; ai = ai->ai_next) | |
502 | ; | |
503 | ai->ai_next = options->listen_addrs; | |
504 | options->listen_addrs = aitop; | |
505 | } | |
506 | ||
9108f8d9 | 507 | /* |
508 | * The strategy for the Match blocks is that the config file is parsed twice. | |
509 | * | |
510 | * The first time is at startup. activep is initialized to 1 and the | |
511 | * directives in the global context are processed and acted on. Hitting a | |
512 | * Match directive unsets activep and the directives inside the block are | |
513 | * checked for syntax only. | |
514 | * | |
515 | * The second time is after a connection has been established but before | |
516 | * authentication. activep is initialized to 2 and global config directives | |
517 | * are ignored since they have already been processed. If the criteria in a | |
518 | * Match block is met, activep is set and the subsequent directives | |
519 | * processed and actioned until EOF or another Match block unsets it. Any | |
520 | * options set are copied into the main server config. | |
521 | * | |
522 | * Potential additions/improvements: | |
523 | * - Add Match support for pre-kex directives, eg Protocol, Ciphers. | |
524 | * | |
525 | * - Add a Tag directive (idea from David Leonard) ala pf, eg: | |
526 | * Match Address 192.168.0.* | |
527 | * Tag trusted | |
528 | * Match Group wheel | |
529 | * Tag trusted | |
530 | * Match Tag trusted | |
531 | * AllowTcpForwarding yes | |
532 | * GatewayPorts clientspecified | |
533 | * [...] | |
534 | * | |
535 | * - Add a PermittedChannelRequests directive | |
536 | * Match Group shell | |
537 | * PermittedChannelRequests session,forwarded-tcpip | |
538 | */ | |
539 | ||
540 | static int | |
541 | match_cfg_line_group(const char *grps, int line, const char *user) | |
542 | { | |
543 | int result = 0; | |
544 | u_int ngrps = 0; | |
545 | char *arg, *p, *cp, *grplist[MAX_MATCH_GROUPS]; | |
546 | struct passwd *pw; | |
547 | ||
548 | /* | |
549 | * Even if we do not have a user yet, we still need to check for | |
550 | * valid syntax. | |
551 | */ | |
552 | arg = cp = xstrdup(grps); | |
553 | while ((p = strsep(&cp, ",")) != NULL && *p != '\0') { | |
554 | if (ngrps >= MAX_MATCH_GROUPS) { | |
555 | error("line %d: too many groups in Match Group", line); | |
556 | result = -1; | |
557 | goto out; | |
558 | } | |
559 | grplist[ngrps++] = p; | |
560 | } | |
561 | ||
562 | if (user == NULL) | |
563 | goto out; | |
564 | ||
565 | if ((pw = getpwnam(user)) == NULL) { | |
566 | debug("Can't match group at line %d because user %.100s does " | |
567 | "not exist", line, user); | |
568 | } else if (ga_init(pw->pw_name, pw->pw_gid) == 0) { | |
569 | debug("Can't Match group because user %.100s not in any group " | |
570 | "at line %d", user, line); | |
571 | } else if (ga_match(grplist, ngrps) != 1) { | |
572 | debug("user %.100s does not match group %.100s at line %d", | |
573 | user, arg, line); | |
574 | } else { | |
575 | debug("user %.100s matched group %.100s at line %d", user, | |
576 | arg, line); | |
577 | result = 1; | |
578 | } | |
579 | out: | |
580 | ga_free(); | |
581 | xfree(arg); | |
582 | return result; | |
583 | } | |
584 | ||
585 | static int | |
586 | match_cfg_line(char **condition, int line, const char *user, const char *host, | |
587 | const char *address) | |
588 | { | |
589 | int result = 1; | |
590 | char *arg, *attrib, *cp = *condition; | |
591 | size_t len; | |
592 | ||
593 | if (user == NULL) | |
594 | debug3("checking syntax for 'Match %s'", cp); | |
595 | else | |
596 | debug3("checking match for '%s' user %s host %s addr %s", cp, | |
597 | user ? user : "(null)", host ? host : "(null)", | |
598 | address ? address : "(null)"); | |
599 | ||
600 | while ((attrib = strdelim(&cp)) && *attrib != '\0') { | |
601 | if ((arg = strdelim(&cp)) == NULL || *arg == '\0') { | |
602 | error("Missing Match criteria for %s", attrib); | |
603 | return -1; | |
604 | } | |
605 | len = strlen(arg); | |
606 | if (strcasecmp(attrib, "user") == 0) { | |
607 | if (!user) { | |
608 | result = 0; | |
609 | continue; | |
610 | } | |
611 | if (match_pattern_list(user, arg, len, 0) != 1) | |
612 | result = 0; | |
613 | else | |
614 | debug("user %.100s matched 'User %.100s' at " | |
615 | "line %d", user, arg, line); | |
616 | } else if (strcasecmp(attrib, "group") == 0) { | |
617 | switch (match_cfg_line_group(arg, line, user)) { | |
618 | case -1: | |
619 | return -1; | |
620 | case 0: | |
621 | result = 0; | |
622 | } | |
623 | } else if (strcasecmp(attrib, "host") == 0) { | |
624 | if (!host) { | |
625 | result = 0; | |
626 | continue; | |
627 | } | |
628 | if (match_hostname(host, arg, len) != 1) | |
629 | result = 0; | |
630 | else | |
631 | debug("connection from %.100s matched 'Host " | |
632 | "%.100s' at line %d", host, arg, line); | |
633 | } else if (strcasecmp(attrib, "address") == 0) { | |
634 | debug("address '%s' arg '%s'", address, arg); | |
635 | if (!address) { | |
636 | result = 0; | |
637 | continue; | |
638 | } | |
639 | if (match_hostname(address, arg, len) != 1) | |
640 | result = 0; | |
641 | else | |
642 | debug("connection from %.100s matched 'Address " | |
643 | "%.100s' at line %d", address, arg, line); | |
644 | } else { | |
645 | error("Unsupported Match attribute %s", attrib); | |
646 | return -1; | |
647 | } | |
648 | } | |
649 | if (user != NULL) | |
650 | debug3("match %sfound", result ? "" : "not "); | |
651 | *condition = cp; | |
652 | return result; | |
653 | } | |
654 | ||
655 | #define WHITESPACE " \t\r\n" | |
656 | ||
e9a17296 | 657 | int |
658 | process_server_config_line(ServerOptions *options, char *line, | |
9108f8d9 | 659 | const char *filename, int linenum, int *activep, const char *user, |
660 | const char *host, const char *address) | |
3c0ef626 | 661 | { |
3c0ef626 | 662 | char *cp, **charptr, *arg, *p; |
9108f8d9 | 663 | int cmdline = 0, *intptr, value, n; |
3c0ef626 | 664 | ServerOpCodes opcode; |
996d5e62 | 665 | u_short port; |
9108f8d9 | 666 | u_int i, flags = 0; |
667 | size_t len; | |
3c0ef626 | 668 | |
e9a17296 | 669 | cp = line; |
9108f8d9 | 670 | if ((arg = strdelim(&cp)) == NULL) |
671 | return 0; | |
e9a17296 | 672 | /* Ignore leading whitespace */ |
673 | if (*arg == '\0') | |
3c0ef626 | 674 | arg = strdelim(&cp); |
e9a17296 | 675 | if (!arg || !*arg || *arg == '#') |
676 | return 0; | |
677 | intptr = NULL; | |
678 | charptr = NULL; | |
9108f8d9 | 679 | opcode = parse_token(arg, filename, linenum, &flags); |
680 | ||
681 | if (activep == NULL) { /* We are processing a command line directive */ | |
682 | cmdline = 1; | |
683 | activep = &cmdline; | |
684 | } | |
685 | if (*activep && opcode != sMatch) | |
686 | debug3("%s:%d setting %s %s", filename, linenum, arg, cp); | |
687 | if (*activep == 0 && !(flags & SSHCFG_MATCH)) { | |
688 | if (user == NULL) { | |
689 | fatal("%s line %d: Directive '%s' is not allowed " | |
690 | "within a Match block", filename, linenum, arg); | |
691 | } else { /* this is a directive we have already processed */ | |
692 | while (arg) | |
693 | arg = strdelim(&cp); | |
694 | return 0; | |
695 | } | |
696 | } | |
697 | ||
e9a17296 | 698 | switch (opcode) { |
699 | /* Portable-specific options */ | |
0fff78ff | 700 | case sUsePAM: |
701 | intptr = &options->use_pam; | |
e9a17296 | 702 | goto parse_flag; |
3c0ef626 | 703 | |
e9a17296 | 704 | /* Standard Options */ |
705 | case sBadOption: | |
706 | return -1; | |
707 | case sPort: | |
708 | /* ignore ports from configfile if cmdline specifies ports */ | |
709 | if (options->ports_from_cmdline) | |
710 | return 0; | |
711 | if (options->listen_addrs != NULL) | |
712 | fatal("%s line %d: ports must be specified before " | |
713 | "ListenAddress.", filename, linenum); | |
714 | if (options->num_ports >= MAX_PORTS) | |
715 | fatal("%s line %d: too many ports.", | |
716 | filename, linenum); | |
717 | arg = strdelim(&cp); | |
718 | if (!arg || *arg == '\0') | |
719 | fatal("%s line %d: missing port number.", | |
720 | filename, linenum); | |
721 | options->ports[options->num_ports++] = a2port(arg); | |
722 | if (options->ports[options->num_ports-1] == 0) | |
723 | fatal("%s line %d: Badly formatted port number.", | |
724 | filename, linenum); | |
725 | break; | |
726 | ||
727 | case sServerKeyBits: | |
728 | intptr = &options->server_key_bits; | |
3c0ef626 | 729 | parse_int: |
e9a17296 | 730 | arg = strdelim(&cp); |
731 | if (!arg || *arg == '\0') | |
732 | fatal("%s line %d: missing integer value.", | |
733 | filename, linenum); | |
734 | value = atoi(arg); | |
9108f8d9 | 735 | if (*activep && *intptr == -1) |
e9a17296 | 736 | *intptr = value; |
737 | break; | |
738 | ||
739 | case sLoginGraceTime: | |
740 | intptr = &options->login_grace_time; | |
3c0ef626 | 741 | parse_time: |
e9a17296 | 742 | arg = strdelim(&cp); |
743 | if (!arg || *arg == '\0') | |
744 | fatal("%s line %d: missing time value.", | |
745 | filename, linenum); | |
746 | if ((value = convtime(arg)) == -1) | |
747 | fatal("%s line %d: invalid time value.", | |
748 | filename, linenum); | |
749 | if (*intptr == -1) | |
750 | *intptr = value; | |
751 | break; | |
752 | ||
753 | case sKeyRegenerationTime: | |
754 | intptr = &options->key_regeneration_time; | |
755 | goto parse_time; | |
756 | ||
757 | case sListenAddress: | |
758 | arg = strdelim(&cp); | |
996d5e62 | 759 | if (arg == NULL || *arg == '\0') |
760 | fatal("%s line %d: missing address", | |
e9a17296 | 761 | filename, linenum); |
665a873d | 762 | /* check for bare IPv6 address: no "[]" and 2 or more ":" */ |
763 | if (strchr(arg, '[') == NULL && (p = strchr(arg, ':')) != NULL | |
764 | && strchr(p+1, ':') != NULL) { | |
765 | add_listen_addr(options, arg, 0); | |
766 | break; | |
767 | } | |
996d5e62 | 768 | p = hpdelim(&arg); |
769 | if (p == NULL) | |
770 | fatal("%s line %d: bad address:port usage", | |
e9a17296 | 771 | filename, linenum); |
996d5e62 | 772 | p = cleanhostname(p); |
773 | if (arg == NULL) | |
774 | port = 0; | |
775 | else if ((port = a2port(arg)) == 0) | |
776 | fatal("%s line %d: bad port number", filename, linenum); | |
777 | ||
778 | add_listen_addr(options, p, port); | |
779 | ||
780 | break; | |
781 | ||
782 | case sAddressFamily: | |
783 | arg = strdelim(&cp); | |
665a873d | 784 | if (!arg || *arg == '\0') |
785 | fatal("%s line %d: missing address family.", | |
786 | filename, linenum); | |
996d5e62 | 787 | intptr = &options->address_family; |
788 | if (options->listen_addrs != NULL) | |
789 | fatal("%s line %d: address family must be specified before " | |
790 | "ListenAddress.", filename, linenum); | |
791 | if (strcasecmp(arg, "inet") == 0) | |
792 | value = AF_INET; | |
793 | else if (strcasecmp(arg, "inet6") == 0) | |
794 | value = AF_INET6; | |
795 | else if (strcasecmp(arg, "any") == 0) | |
796 | value = AF_UNSPEC; | |
797 | else | |
798 | fatal("%s line %d: unsupported address family \"%s\".", | |
799 | filename, linenum, arg); | |
800 | if (*intptr == -1) | |
801 | *intptr = value; | |
e9a17296 | 802 | break; |
803 | ||
804 | case sHostKeyFile: | |
805 | intptr = &options->num_host_key_files; | |
806 | if (*intptr >= MAX_HOSTKEYS) | |
807 | fatal("%s line %d: too many host keys specified (max %d).", | |
808 | filename, linenum, MAX_HOSTKEYS); | |
809 | charptr = &options->host_key_files[*intptr]; | |
3c0ef626 | 810 | parse_filename: |
e9a17296 | 811 | arg = strdelim(&cp); |
812 | if (!arg || *arg == '\0') | |
813 | fatal("%s line %d: missing file name.", | |
814 | filename, linenum); | |
9108f8d9 | 815 | if (*activep && *charptr == NULL) { |
e9a17296 | 816 | *charptr = tilde_expand_filename(arg, getuid()); |
817 | /* increase optional counter */ | |
818 | if (intptr != NULL) | |
819 | *intptr = *intptr + 1; | |
820 | } | |
821 | break; | |
3c0ef626 | 822 | |
e9a17296 | 823 | case sPidFile: |
824 | charptr = &options->pid_file; | |
825 | goto parse_filename; | |
3c0ef626 | 826 | |
e9a17296 | 827 | case sPermitRootLogin: |
828 | intptr = &options->permit_root_login; | |
829 | arg = strdelim(&cp); | |
830 | if (!arg || *arg == '\0') | |
831 | fatal("%s line %d: missing yes/" | |
832 | "without-password/forced-commands-only/no " | |
833 | "argument.", filename, linenum); | |
834 | value = 0; /* silence compiler */ | |
835 | if (strcmp(arg, "without-password") == 0) | |
836 | value = PERMIT_NO_PASSWD; | |
837 | else if (strcmp(arg, "forced-commands-only") == 0) | |
838 | value = PERMIT_FORCED_ONLY; | |
839 | else if (strcmp(arg, "yes") == 0) | |
840 | value = PERMIT_YES; | |
841 | else if (strcmp(arg, "no") == 0) | |
842 | value = PERMIT_NO; | |
843 | else | |
844 | fatal("%s line %d: Bad yes/" | |
845 | "without-password/forced-commands-only/no " | |
846 | "argument: %s", filename, linenum, arg); | |
847 | if (*intptr == -1) | |
848 | *intptr = value; | |
849 | break; | |
850 | ||
851 | case sIgnoreRhosts: | |
852 | intptr = &options->ignore_rhosts; | |
3c0ef626 | 853 | parse_flag: |
e9a17296 | 854 | arg = strdelim(&cp); |
855 | if (!arg || *arg == '\0') | |
856 | fatal("%s line %d: missing yes/no argument.", | |
857 | filename, linenum); | |
858 | value = 0; /* silence compiler */ | |
859 | if (strcmp(arg, "yes") == 0) | |
860 | value = 1; | |
861 | else if (strcmp(arg, "no") == 0) | |
862 | value = 0; | |
863 | else | |
864 | fatal("%s line %d: Bad yes/no argument: %s", | |
865 | filename, linenum, arg); | |
9108f8d9 | 866 | if (*activep && *intptr == -1) |
e9a17296 | 867 | *intptr = value; |
868 | break; | |
869 | ||
bed7ee6f | 870 | case sNoneEnabled: |
871 | intptr = &options->none_enabled; | |
872 | goto parse_flag; | |
873 | ||
874 | case sTcpRcvBufPoll: | |
875 | intptr = &options->tcp_rcv_buf_poll; | |
876 | goto parse_flag; | |
877 | ||
878 | case sHPNDisabled: | |
879 | intptr = &options->hpn_disabled; | |
880 | goto parse_flag; | |
881 | ||
882 | case sHPNBufferSize: | |
883 | intptr = &options->hpn_buffer_size; | |
884 | goto parse_int; | |
885 | ||
e9a17296 | 886 | case sIgnoreUserKnownHosts: |
887 | intptr = &options->ignore_user_known_hosts; | |
888 | goto parse_flag; | |
889 | ||
e9a17296 | 890 | case sRhostsRSAAuthentication: |
891 | intptr = &options->rhosts_rsa_authentication; | |
892 | goto parse_flag; | |
893 | ||
894 | case sHostbasedAuthentication: | |
895 | intptr = &options->hostbased_authentication; | |
896 | goto parse_flag; | |
897 | ||
898 | case sHostbasedUsesNameFromPacketOnly: | |
899 | intptr = &options->hostbased_uses_name_from_packet_only; | |
900 | goto parse_flag; | |
901 | ||
902 | case sRSAAuthentication: | |
903 | intptr = &options->rsa_authentication; | |
904 | goto parse_flag; | |
905 | ||
906 | case sPubkeyAuthentication: | |
907 | intptr = &options->pubkey_authentication; | |
908 | goto parse_flag; | |
0fff78ff | 909 | |
e9a17296 | 910 | case sKerberosAuthentication: |
911 | intptr = &options->kerberos_authentication; | |
912 | goto parse_flag; | |
3c0ef626 | 913 | |
e9a17296 | 914 | case sKerberosOrLocalPasswd: |
915 | intptr = &options->kerberos_or_local_passwd; | |
916 | goto parse_flag; | |
3c0ef626 | 917 | |
e9a17296 | 918 | case sKerberosTicketCleanup: |
919 | intptr = &options->kerberos_ticket_cleanup; | |
920 | goto parse_flag; | |
0fff78ff | 921 | |
cdd66111 | 922 | case sKerberosGetAFSToken: |
923 | intptr = &options->kerberos_get_afs_token; | |
924 | goto parse_flag; | |
925 | ||
0fff78ff | 926 | case sGssAuthentication: |
927 | intptr = &options->gss_authentication; | |
e9a17296 | 928 | goto parse_flag; |
0fff78ff | 929 | |
659bdb8e | 930 | case sGssKeyEx: |
931 | intptr = &options->gss_keyex; | |
932 | goto parse_flag; | |
933 | ||
0fff78ff | 934 | case sGssCleanupCreds: |
935 | intptr = &options->gss_cleanup_creds; | |
e9a17296 | 936 | goto parse_flag; |
3c0ef626 | 937 | |
659bdb8e | 938 | case sGssStrictAcceptor: |
939 | intptr = &options->gss_strict_acceptor; | |
940 | goto parse_flag; | |
941 | ||
e9a17296 | 942 | case sPasswordAuthentication: |
943 | intptr = &options->password_authentication; | |
944 | goto parse_flag; | |
3c0ef626 | 945 | |
e9a17296 | 946 | case sKbdInteractiveAuthentication: |
947 | intptr = &options->kbd_interactive_authentication; | |
948 | goto parse_flag; | |
3c0ef626 | 949 | |
e9a17296 | 950 | case sChallengeResponseAuthentication: |
951 | intptr = &options->challenge_response_authentication; | |
952 | goto parse_flag; | |
3c0ef626 | 953 | |
e9a17296 | 954 | case sPrintMotd: |
955 | intptr = &options->print_motd; | |
956 | goto parse_flag; | |
3c0ef626 | 957 | |
e9a17296 | 958 | case sPrintLastLog: |
959 | intptr = &options->print_lastlog; | |
960 | goto parse_flag; | |
3c0ef626 | 961 | |
e9a17296 | 962 | case sX11Forwarding: |
963 | intptr = &options->x11_forwarding; | |
964 | goto parse_flag; | |
3c0ef626 | 965 | |
e9a17296 | 966 | case sX11DisplayOffset: |
967 | intptr = &options->x11_display_offset; | |
968 | goto parse_int; | |
3c0ef626 | 969 | |
e9a17296 | 970 | case sX11UseLocalhost: |
971 | intptr = &options->x11_use_localhost; | |
972 | goto parse_flag; | |
3c0ef626 | 973 | |
e9a17296 | 974 | case sXAuthLocation: |
975 | charptr = &options->xauth_location; | |
976 | goto parse_filename; | |
3c0ef626 | 977 | |
e9a17296 | 978 | case sStrictModes: |
979 | intptr = &options->strict_modes; | |
980 | goto parse_flag; | |
3c0ef626 | 981 | |
cdd66111 | 982 | case sTCPKeepAlive: |
983 | intptr = &options->tcp_keep_alive; | |
e9a17296 | 984 | goto parse_flag; |
3c0ef626 | 985 | |
e9a17296 | 986 | case sEmptyPasswd: |
987 | intptr = &options->permit_empty_passwd; | |
988 | goto parse_flag; | |
3c0ef626 | 989 | |
41b2f314 | 990 | case sPermitUserEnvironment: |
991 | intptr = &options->permit_user_env; | |
992 | goto parse_flag; | |
993 | ||
e9a17296 | 994 | case sUseLogin: |
995 | intptr = &options->use_login; | |
996 | goto parse_flag; | |
3c0ef626 | 997 | |
f5799ae1 | 998 | case sCompression: |
999 | intptr = &options->compression; | |
665a873d | 1000 | arg = strdelim(&cp); |
1001 | if (!arg || *arg == '\0') | |
1002 | fatal("%s line %d: missing yes/no/delayed " | |
1003 | "argument.", filename, linenum); | |
1004 | value = 0; /* silence compiler */ | |
1005 | if (strcmp(arg, "delayed") == 0) | |
1006 | value = COMP_DELAYED; | |
1007 | else if (strcmp(arg, "yes") == 0) | |
1008 | value = COMP_ZLIB; | |
1009 | else if (strcmp(arg, "no") == 0) | |
1010 | value = COMP_NONE; | |
1011 | else | |
1012 | fatal("%s line %d: Bad yes/no/delayed " | |
1013 | "argument: %s", filename, linenum, arg); | |
1014 | if (*intptr == -1) | |
1015 | *intptr = value; | |
1016 | break; | |
f5799ae1 | 1017 | |
e9a17296 | 1018 | case sGatewayPorts: |
1019 | intptr = &options->gateway_ports; | |
996d5e62 | 1020 | arg = strdelim(&cp); |
1021 | if (!arg || *arg == '\0') | |
1022 | fatal("%s line %d: missing yes/no/clientspecified " | |
1023 | "argument.", filename, linenum); | |
1024 | value = 0; /* silence compiler */ | |
1025 | if (strcmp(arg, "clientspecified") == 0) | |
1026 | value = 2; | |
1027 | else if (strcmp(arg, "yes") == 0) | |
1028 | value = 1; | |
1029 | else if (strcmp(arg, "no") == 0) | |
1030 | value = 0; | |
1031 | else | |
1032 | fatal("%s line %d: Bad yes/no/clientspecified " | |
1033 | "argument: %s", filename, linenum, arg); | |
1034 | if (*intptr == -1) | |
1035 | *intptr = value; | |
1036 | break; | |
3c0ef626 | 1037 | |
0fff78ff | 1038 | case sUseDNS: |
1039 | intptr = &options->use_dns; | |
e9a17296 | 1040 | goto parse_flag; |
3c0ef626 | 1041 | |
e9a17296 | 1042 | case sLogFacility: |
1043 | intptr = (int *) &options->log_facility; | |
1044 | arg = strdelim(&cp); | |
1045 | value = log_facility_number(arg); | |
1046 | if (value == SYSLOG_FACILITY_NOT_SET) | |
1047 | fatal("%.200s line %d: unsupported log facility '%s'", | |
1048 | filename, linenum, arg ? arg : "<NONE>"); | |
1049 | if (*intptr == -1) | |
1050 | *intptr = (SyslogFacility) value; | |
1051 | break; | |
1052 | ||
1053 | case sLogLevel: | |
1054 | intptr = (int *) &options->log_level; | |
1055 | arg = strdelim(&cp); | |
1056 | value = log_level_number(arg); | |
1057 | if (value == SYSLOG_LEVEL_NOT_SET) | |
1058 | fatal("%.200s line %d: unsupported log level '%s'", | |
1059 | filename, linenum, arg ? arg : "<NONE>"); | |
1060 | if (*intptr == -1) | |
1061 | *intptr = (LogLevel) value; | |
1062 | break; | |
1063 | ||
1064 | case sAllowTcpForwarding: | |
1065 | intptr = &options->allow_tcp_forwarding; | |
1066 | goto parse_flag; | |
1067 | ||
700318f3 | 1068 | case sUsePrivilegeSeparation: |
1069 | intptr = &use_privsep; | |
1070 | goto parse_flag; | |
1071 | ||
e9a17296 | 1072 | case sAllowUsers: |
1073 | while ((arg = strdelim(&cp)) && *arg != '\0') { | |
1074 | if (options->num_allow_users >= MAX_ALLOW_USERS) | |
1075 | fatal("%s line %d: too many allow users.", | |
1076 | filename, linenum); | |
680cee3b | 1077 | options->allow_users[options->num_allow_users++] = |
1078 | xstrdup(arg); | |
e9a17296 | 1079 | } |
1080 | break; | |
3c0ef626 | 1081 | |
e9a17296 | 1082 | case sDenyUsers: |
1083 | while ((arg = strdelim(&cp)) && *arg != '\0') { | |
1084 | if (options->num_deny_users >= MAX_DENY_USERS) | |
9108f8d9 | 1085 | fatal("%s line %d: too many deny users.", |
e9a17296 | 1086 | filename, linenum); |
680cee3b | 1087 | options->deny_users[options->num_deny_users++] = |
1088 | xstrdup(arg); | |
e9a17296 | 1089 | } |
1090 | break; | |
3c0ef626 | 1091 | |
e9a17296 | 1092 | case sAllowGroups: |
1093 | while ((arg = strdelim(&cp)) && *arg != '\0') { | |
1094 | if (options->num_allow_groups >= MAX_ALLOW_GROUPS) | |
1095 | fatal("%s line %d: too many allow groups.", | |
1096 | filename, linenum); | |
680cee3b | 1097 | options->allow_groups[options->num_allow_groups++] = |
1098 | xstrdup(arg); | |
e9a17296 | 1099 | } |
1100 | break; | |
3c0ef626 | 1101 | |
e9a17296 | 1102 | case sDenyGroups: |
1103 | while ((arg = strdelim(&cp)) && *arg != '\0') { | |
1104 | if (options->num_deny_groups >= MAX_DENY_GROUPS) | |
1105 | fatal("%s line %d: too many deny groups.", | |
1106 | filename, linenum); | |
1107 | options->deny_groups[options->num_deny_groups++] = xstrdup(arg); | |
1108 | } | |
1109 | break; | |
1110 | ||
1111 | case sCiphers: | |
1112 | arg = strdelim(&cp); | |
1113 | if (!arg || *arg == '\0') | |
1114 | fatal("%s line %d: Missing argument.", filename, linenum); | |
1115 | if (!ciphers_valid(arg)) | |
1116 | fatal("%s line %d: Bad SSH2 cipher spec '%s'.", | |
1117 | filename, linenum, arg ? arg : "<NONE>"); | |
1118 | if (options->ciphers == NULL) | |
1119 | options->ciphers = xstrdup(arg); | |
1120 | break; | |
1121 | ||
1122 | case sMacs: | |
1123 | arg = strdelim(&cp); | |
1124 | if (!arg || *arg == '\0') | |
1125 | fatal("%s line %d: Missing argument.", filename, linenum); | |
1126 | if (!mac_valid(arg)) | |
1127 | fatal("%s line %d: Bad SSH2 mac spec '%s'.", | |
1128 | filename, linenum, arg ? arg : "<NONE>"); | |
1129 | if (options->macs == NULL) | |
1130 | options->macs = xstrdup(arg); | |
1131 | break; | |
1132 | ||
1133 | case sProtocol: | |
1134 | intptr = &options->protocol; | |
1135 | arg = strdelim(&cp); | |
1136 | if (!arg || *arg == '\0') | |
1137 | fatal("%s line %d: Missing argument.", filename, linenum); | |
1138 | value = proto_spec(arg); | |
1139 | if (value == SSH_PROTO_UNKNOWN) | |
1140 | fatal("%s line %d: Bad protocol spec '%s'.", | |
1141 | filename, linenum, arg ? arg : "<NONE>"); | |
1142 | if (*intptr == SSH_PROTO_UNKNOWN) | |
1143 | *intptr = value; | |
1144 | break; | |
1145 | ||
1146 | case sSubsystem: | |
1147 | if (options->num_subsystems >= MAX_SUBSYSTEMS) { | |
1148 | fatal("%s line %d: too many subsystems defined.", | |
1149 | filename, linenum); | |
1150 | } | |
1151 | arg = strdelim(&cp); | |
1152 | if (!arg || *arg == '\0') | |
1153 | fatal("%s line %d: Missing subsystem name.", | |
1154 | filename, linenum); | |
9108f8d9 | 1155 | if (!*activep) { |
1156 | arg = strdelim(&cp); | |
1157 | break; | |
1158 | } | |
e9a17296 | 1159 | for (i = 0; i < options->num_subsystems; i++) |
1160 | if (strcmp(arg, options->subsystem_name[i]) == 0) | |
1161 | fatal("%s line %d: Subsystem '%s' already defined.", | |
1162 | filename, linenum, arg); | |
1163 | options->subsystem_name[options->num_subsystems] = xstrdup(arg); | |
1164 | arg = strdelim(&cp); | |
1165 | if (!arg || *arg == '\0') | |
1166 | fatal("%s line %d: Missing subsystem command.", | |
1167 | filename, linenum); | |
1168 | options->subsystem_command[options->num_subsystems] = xstrdup(arg); | |
9108f8d9 | 1169 | |
1170 | /* Collect arguments (separate to executable) */ | |
1171 | p = xstrdup(arg); | |
1172 | len = strlen(p) + 1; | |
1173 | while ((arg = strdelim(&cp)) != NULL && *arg != '\0') { | |
1174 | len += 1 + strlen(arg); | |
1175 | p = xrealloc(p, 1, len); | |
1176 | strlcat(p, " ", len); | |
1177 | strlcat(p, arg, len); | |
1178 | } | |
1179 | options->subsystem_args[options->num_subsystems] = p; | |
e9a17296 | 1180 | options->num_subsystems++; |
1181 | break; | |
1182 | ||
1183 | case sMaxStartups: | |
1184 | arg = strdelim(&cp); | |
1185 | if (!arg || *arg == '\0') | |
1186 | fatal("%s line %d: Missing MaxStartups spec.", | |
1187 | filename, linenum); | |
1188 | if ((n = sscanf(arg, "%d:%d:%d", | |
1189 | &options->max_startups_begin, | |
1190 | &options->max_startups_rate, | |
1191 | &options->max_startups)) == 3) { | |
1192 | if (options->max_startups_begin > | |
1193 | options->max_startups || | |
1194 | options->max_startups_rate > 100 || | |
1195 | options->max_startups_rate < 1) | |
3c0ef626 | 1196 | fatal("%s line %d: Illegal MaxStartups spec.", |
1197 | filename, linenum); | |
e9a17296 | 1198 | } else if (n != 1) |
1199 | fatal("%s line %d: Illegal MaxStartups spec.", | |
1200 | filename, linenum); | |
1201 | else | |
1202 | options->max_startups = options->max_startups_begin; | |
1203 | break; | |
1204 | ||
c9f39d2c | 1205 | case sMaxAuthTries: |
1206 | intptr = &options->max_authtries; | |
1207 | goto parse_int; | |
1208 | ||
e9a17296 | 1209 | case sBanner: |
1210 | charptr = &options->banner; | |
1211 | goto parse_filename; | |
1212 | /* | |
1213 | * These options can contain %X options expanded at | |
1214 | * connect time, so that you can specify paths like: | |
1215 | * | |
1216 | * AuthorizedKeysFile /etc/ssh_keys/%u | |
1217 | */ | |
1218 | case sAuthorizedKeysFile: | |
1219 | case sAuthorizedKeysFile2: | |
9108f8d9 | 1220 | charptr = (opcode == sAuthorizedKeysFile) ? |
e9a17296 | 1221 | &options->authorized_keys_file : |
1222 | &options->authorized_keys_file2; | |
1223 | goto parse_filename; | |
1224 | ||
1225 | case sClientAliveInterval: | |
1226 | intptr = &options->client_alive_interval; | |
1227 | goto parse_time; | |
1228 | ||
1229 | case sClientAliveCountMax: | |
1230 | intptr = &options->client_alive_count_max; | |
1231 | goto parse_int; | |
1232 | ||
c9f39d2c | 1233 | case sAcceptEnv: |
1234 | while ((arg = strdelim(&cp)) && *arg != '\0') { | |
1235 | if (strchr(arg, '=') != NULL) | |
1236 | fatal("%s line %d: Invalid environment name.", | |
1237 | filename, linenum); | |
1238 | if (options->num_accept_env >= MAX_ACCEPT_ENV) | |
1239 | fatal("%s line %d: too many allow env.", | |
1240 | filename, linenum); | |
9108f8d9 | 1241 | if (!*activep) |
1242 | break; | |
c9f39d2c | 1243 | options->accept_env[options->num_accept_env++] = |
1244 | xstrdup(arg); | |
1245 | } | |
1246 | break; | |
1247 | ||
2c06c99b | 1248 | case sPermitTunnel: |
1249 | intptr = &options->permit_tun; | |
1250 | arg = strdelim(&cp); | |
1251 | if (!arg || *arg == '\0') | |
1252 | fatal("%s line %d: Missing yes/point-to-point/" | |
1253 | "ethernet/no argument.", filename, linenum); | |
1254 | value = 0; /* silence compiler */ | |
1255 | if (strcasecmp(arg, "ethernet") == 0) | |
1256 | value = SSH_TUNMODE_ETHERNET; | |
1257 | else if (strcasecmp(arg, "point-to-point") == 0) | |
1258 | value = SSH_TUNMODE_POINTOPOINT; | |
1259 | else if (strcasecmp(arg, "yes") == 0) | |
1260 | value = SSH_TUNMODE_YES; | |
1261 | else if (strcasecmp(arg, "no") == 0) | |
1262 | value = SSH_TUNMODE_NO; | |
1263 | else | |
1264 | fatal("%s line %d: Bad yes/point-to-point/ethernet/" | |
1265 | "no argument: %s", filename, linenum, arg); | |
1266 | if (*intptr == -1) | |
1267 | *intptr = value; | |
1268 | break; | |
1269 | ||
9108f8d9 | 1270 | case sMatch: |
1271 | if (cmdline) | |
1272 | fatal("Match directive not supported as a command-line " | |
1273 | "option"); | |
1274 | value = match_cfg_line(&cp, linenum, user, host, address); | |
1275 | if (value < 0) | |
1276 | fatal("%s line %d: Bad Match condition", filename, | |
1277 | linenum); | |
1278 | *activep = value; | |
1279 | break; | |
1280 | ||
1281 | case sPermitOpen: | |
1282 | arg = strdelim(&cp); | |
1283 | if (!arg || *arg == '\0') | |
1284 | fatal("%s line %d: missing PermitOpen specification", | |
1285 | filename, linenum); | |
1286 | if (strcmp(arg, "any") == 0) { | |
1287 | if (*activep) { | |
1288 | channel_clear_adm_permitted_opens(); | |
1289 | options->num_permitted_opens = 0; | |
1290 | } | |
1291 | break; | |
1292 | } | |
1293 | for (; arg != NULL && *arg != '\0'; arg = strdelim(&cp)) { | |
1294 | p = hpdelim(&arg); | |
1295 | if (p == NULL) | |
1296 | fatal("%s line %d: missing host in PermitOpen", | |
1297 | filename, linenum); | |
1298 | p = cleanhostname(p); | |
1299 | if (arg == NULL || (port = a2port(arg)) == 0) | |
1300 | fatal("%s line %d: bad port number in " | |
1301 | "PermitOpen", filename, linenum); | |
1302 | if (*activep && options->num_permitted_opens == -1) { | |
1303 | channel_clear_adm_permitted_opens(); | |
1304 | options->num_permitted_opens = | |
1305 | channel_add_adm_permitted_opens(p, port); | |
1306 | } | |
1307 | } | |
1308 | break; | |
1309 | ||
1310 | case sForceCommand: | |
1311 | if (cp == NULL) | |
1312 | fatal("%.200s line %d: Missing argument.", filename, | |
1313 | linenum); | |
1314 | len = strspn(cp, WHITESPACE); | |
1315 | if (*activep && options->adm_forced_command == NULL) | |
1316 | options->adm_forced_command = xstrdup(cp + len); | |
1317 | return 0; | |
1318 | ||
e9a17296 | 1319 | case sDeprecated: |
0fff78ff | 1320 | logit("%s line %d: Deprecated option %s", |
1321 | filename, linenum, arg); | |
1322 | while (arg) | |
1323 | arg = strdelim(&cp); | |
1324 | break; | |
1325 | ||
1326 | case sUnsupported: | |
1327 | logit("%s line %d: Unsupported option %s", | |
e9a17296 | 1328 | filename, linenum, arg); |
1329 | while (arg) | |
1330 | arg = strdelim(&cp); | |
1331 | break; | |
1332 | ||
1333 | default: | |
1334 | fatal("%s line %d: Missing handler for opcode %s (%d)", | |
1335 | filename, linenum, arg, opcode); | |
1336 | } | |
1337 | if ((arg = strdelim(&cp)) != NULL && *arg != '\0') | |
1338 | fatal("%s line %d: garbage at end of line; \"%.200s\".", | |
1339 | filename, linenum, arg); | |
1340 | return 0; | |
1341 | } | |
3c0ef626 | 1342 | |
e9a17296 | 1343 | /* Reads the server configuration file. */ |
3c0ef626 | 1344 | |
e9a17296 | 1345 | void |
c9f39d2c | 1346 | load_server_config(const char *filename, Buffer *conf) |
e9a17296 | 1347 | { |
c9f39d2c | 1348 | char line[1024], *cp; |
680cee3b | 1349 | FILE *f; |
e9a17296 | 1350 | |
c9f39d2c | 1351 | debug2("%s: filename %s", __func__, filename); |
1352 | if ((f = fopen(filename, "r")) == NULL) { | |
e9a17296 | 1353 | perror(filename); |
1354 | exit(1); | |
1355 | } | |
c9f39d2c | 1356 | buffer_clear(conf); |
e9a17296 | 1357 | while (fgets(line, sizeof(line), f)) { |
c9f39d2c | 1358 | /* |
1359 | * Trim out comments and strip whitespace | |
1360 | * NB - preserve newlines, they are needed to reproduce | |
1361 | * line numbers later for error messages | |
1362 | */ | |
1363 | if ((cp = strchr(line, '#')) != NULL) | |
1364 | memcpy(cp, "\n", 2); | |
1365 | cp = line + strspn(line, " \t\r"); | |
1366 | ||
1367 | buffer_append(conf, cp, strlen(cp)); | |
3c0ef626 | 1368 | } |
c9f39d2c | 1369 | buffer_append(conf, "\0", 1); |
3c0ef626 | 1370 | fclose(f); |
c9f39d2c | 1371 | debug2("%s: done config len = %d", __func__, buffer_len(conf)); |
1372 | } | |
1373 | ||
1374 | void | |
9108f8d9 | 1375 | parse_server_match_config(ServerOptions *options, const char *user, |
1376 | const char *host, const char *address) | |
1377 | { | |
1378 | ServerOptions mo; | |
1379 | ||
1380 | initialize_server_options(&mo); | |
1381 | parse_server_config(&mo, "reprocess config", &cfg, user, host, address); | |
1382 | copy_set_server_options(options, &mo); | |
1383 | } | |
1384 | ||
1385 | /* Copy any (supported) values that are set */ | |
1386 | void | |
1387 | copy_set_server_options(ServerOptions *dst, ServerOptions *src) | |
1388 | { | |
1389 | if (src->allow_tcp_forwarding != -1) | |
1390 | dst->allow_tcp_forwarding = src->allow_tcp_forwarding; | |
1391 | if (src->gateway_ports != -1) | |
1392 | dst->gateway_ports = src->gateway_ports; | |
1393 | if (src->adm_forced_command != NULL) { | |
1394 | if (dst->adm_forced_command != NULL) | |
1395 | xfree(dst->adm_forced_command); | |
1396 | dst->adm_forced_command = src->adm_forced_command; | |
1397 | } | |
1398 | if (src->x11_display_offset != -1) | |
1399 | dst->x11_display_offset = src->x11_display_offset; | |
1400 | if (src->x11_forwarding != -1) | |
1401 | dst->x11_forwarding = src->x11_forwarding; | |
1402 | if (src->x11_use_localhost != -1) | |
1403 | dst->x11_use_localhost = src->x11_use_localhost; | |
1404 | } | |
1405 | ||
1406 | void | |
1407 | parse_server_config(ServerOptions *options, const char *filename, Buffer *conf, | |
1408 | const char *user, const char *host, const char *address) | |
c9f39d2c | 1409 | { |
9108f8d9 | 1410 | int active, linenum, bad_options = 0; |
c9f39d2c | 1411 | char *cp, *obuf, *cbuf; |
1412 | ||
1413 | debug2("%s: config %s len %d", __func__, filename, buffer_len(conf)); | |
1414 | ||
1415 | obuf = cbuf = xstrdup(buffer_ptr(conf)); | |
9108f8d9 | 1416 | active = user ? 0 : 1; |
c9f39d2c | 1417 | linenum = 1; |
dec6d9fe | 1418 | while ((cp = strsep(&cbuf, "\n")) != NULL) { |
c9f39d2c | 1419 | if (process_server_config_line(options, cp, filename, |
9108f8d9 | 1420 | linenum++, &active, user, host, address) != 0) |
c9f39d2c | 1421 | bad_options++; |
1422 | } | |
1423 | xfree(obuf); | |
3c0ef626 | 1424 | if (bad_options > 0) |
1425 | fatal("%s: terminating, %d bad configuration options", | |
1426 | filename, bad_options); | |
1427 | } |