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1 | /* $OpenBSD: servconf.c,v 1.166 2006/12/13 08:34:39 dtucker Exp $ */ | |
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" | |
14 | ||
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" | |
28 | #include "ssh.h" | |
29 | #include "log.h" | |
30 | #include "buffer.h" | |
31 | #include "servconf.h" | |
32 | #include "compat.h" | |
33 | #include "pathnames.h" | |
34 | #include "misc.h" | |
35 | #include "cipher.h" | |
36 | #include "key.h" | |
37 | #include "kex.h" | |
38 | #include "mac.h" | |
39 | #include "match.h" | |
40 | #include "channels.h" | |
41 | #include "groupaccess.h" | |
42 | ||
43 | static void add_listen_addr(ServerOptions *, char *, u_short); | |
44 | static void add_one_listen_addr(ServerOptions *, char *, u_short); | |
45 | ||
46 | /* Use of privilege separation or not */ | |
47 | extern int use_privsep; | |
48 | extern Buffer cfg; | |
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 */ | |
58 | options->use_pam = -1; | |
59 | ||
60 | /* Standard Options */ | |
61 | options->num_ports = 0; | |
62 | options->ports_from_cmdline = 0; | |
63 | options->listen_addrs = NULL; | |
64 | options->address_family = -1; | |
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; | |
77 | options->x11_use_localhost = -1; | |
78 | options->xauth_location = NULL; | |
79 | options->strict_modes = -1; | |
80 | options->tcp_keep_alive = -1; | |
81 | options->log_facility = SYSLOG_FACILITY_NOT_SET; | |
82 | options->log_level = SYSLOG_LEVEL_NOT_SET; | |
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; | |
88 | options->kerberos_authentication = -1; | |
89 | options->kerberos_or_local_passwd = -1; | |
90 | options->kerberos_ticket_cleanup = -1; | |
91 | options->kerberos_get_afs_token = -1; | |
92 | options->gss_authentication=-1; | |
93 | options->gss_cleanup_creds = -1; | |
94 | options->password_authentication = -1; | |
95 | options->kbd_interactive_authentication = -1; | |
96 | options->challenge_response_authentication = -1; | |
97 | options->permit_empty_passwd = -1; | |
98 | options->permit_user_env = -1; | |
99 | options->use_login = -1; | |
100 | options->compression = -1; | |
101 | options->allow_tcp_forwarding = -1; | |
102 | options->num_allow_users = 0; | |
103 | options->num_deny_users = 0; | |
104 | options->num_allow_groups = 0; | |
105 | options->num_deny_groups = 0; | |
106 | options->ciphers = NULL; | |
107 | options->macs = NULL; | |
108 | options->protocol = SSH_PROTO_UNKNOWN; | |
109 | options->gateway_ports = -1; | |
110 | options->num_subsystems = 0; | |
111 | options->max_startups_begin = -1; | |
112 | options->max_startups_rate = -1; | |
113 | options->max_startups = -1; | |
114 | options->max_authtries = -1; | |
115 | options->banner = NULL; | |
116 | options->use_dns = -1; | |
117 | options->client_alive_interval = -1; | |
118 | options->client_alive_count_max = -1; | |
119 | options->authorized_keys_file = NULL; | |
120 | options->authorized_keys_file2 = NULL; | |
121 | options->num_accept_env = 0; | |
122 | options->permit_tun = -1; | |
123 | options->num_permitted_opens = -1; | |
124 | options->adm_forced_command = NULL; | |
125 | } | |
126 | ||
127 | void | |
128 | fill_default_server_options(ServerOptions *options) | |
129 | { | |
130 | /* Portable-specific options */ | |
131 | if (options->use_pam == -1) | |
132 | options->use_pam = 0; | |
133 | ||
134 | /* Standard Options */ | |
135 | if (options->protocol == SSH_PROTO_UNKNOWN) | |
136 | options->protocol = SSH_PROTO_1|SSH_PROTO_2; | |
137 | if (options->num_host_key_files == 0) { | |
138 | /* fill default hostkeys for protocols */ | |
139 | if (options->protocol & SSH_PROTO_1) | |
140 | options->host_key_files[options->num_host_key_files++] = | |
141 | _PATH_HOST_KEY_FILE; | |
142 | if (options->protocol & SSH_PROTO_2) { | |
143 | options->host_key_files[options->num_host_key_files++] = | |
144 | _PATH_HOST_RSA_KEY_FILE; | |
145 | options->host_key_files[options->num_host_key_files++] = | |
146 | _PATH_HOST_DSA_KEY_FILE; | |
147 | } | |
148 | } | |
149 | if (options->num_ports == 0) | |
150 | options->ports[options->num_ports++] = SSH_DEFAULT_PORT; | |
151 | if (options->listen_addrs == NULL) | |
152 | add_listen_addr(options, NULL, 0); | |
153 | if (options->pid_file == NULL) | |
154 | options->pid_file = _PATH_SSH_DAEMON_PID_FILE; | |
155 | if (options->server_key_bits == -1) | |
156 | options->server_key_bits = 768; | |
157 | if (options->login_grace_time == -1) | |
158 | options->login_grace_time = 120; | |
159 | if (options->key_regeneration_time == -1) | |
160 | options->key_regeneration_time = 3600; | |
161 | if (options->permit_root_login == PERMIT_NOT_SET) | |
162 | options->permit_root_login = PERMIT_YES; | |
163 | if (options->ignore_rhosts == -1) | |
164 | options->ignore_rhosts = 1; | |
165 | if (options->ignore_user_known_hosts == -1) | |
166 | options->ignore_user_known_hosts = 0; | |
167 | if (options->print_motd == -1) | |
168 | options->print_motd = 1; | |
169 | if (options->print_lastlog == -1) | |
170 | options->print_lastlog = 1; | |
171 | if (options->x11_forwarding == -1) | |
172 | options->x11_forwarding = 0; | |
173 | if (options->x11_display_offset == -1) | |
174 | options->x11_display_offset = 10; | |
175 | if (options->x11_use_localhost == -1) | |
176 | options->x11_use_localhost = 1; | |
177 | if (options->xauth_location == NULL) | |
178 | options->xauth_location = _PATH_XAUTH; | |
179 | if (options->strict_modes == -1) | |
180 | options->strict_modes = 1; | |
181 | if (options->tcp_keep_alive == -1) | |
182 | options->tcp_keep_alive = 1; | |
183 | if (options->log_facility == SYSLOG_FACILITY_NOT_SET) | |
184 | options->log_facility = SYSLOG_FACILITY_AUTH; | |
185 | if (options->log_level == SYSLOG_LEVEL_NOT_SET) | |
186 | options->log_level = SYSLOG_LEVEL_INFO; | |
187 | if (options->rhosts_rsa_authentication == -1) | |
188 | options->rhosts_rsa_authentication = 0; | |
189 | if (options->hostbased_authentication == -1) | |
190 | options->hostbased_authentication = 0; | |
191 | if (options->hostbased_uses_name_from_packet_only == -1) | |
192 | options->hostbased_uses_name_from_packet_only = 0; | |
193 | if (options->rsa_authentication == -1) | |
194 | options->rsa_authentication = 1; | |
195 | if (options->pubkey_authentication == -1) | |
196 | options->pubkey_authentication = 1; | |
197 | if (options->kerberos_authentication == -1) | |
198 | options->kerberos_authentication = 0; | |
199 | if (options->kerberos_or_local_passwd == -1) | |
200 | options->kerberos_or_local_passwd = 1; | |
201 | if (options->kerberos_ticket_cleanup == -1) | |
202 | options->kerberos_ticket_cleanup = 1; | |
203 | if (options->kerberos_get_afs_token == -1) | |
204 | options->kerberos_get_afs_token = 0; | |
205 | if (options->gss_authentication == -1) | |
206 | options->gss_authentication = 0; | |
207 | if (options->gss_cleanup_creds == -1) | |
208 | options->gss_cleanup_creds = 1; | |
209 | if (options->password_authentication == -1) | |
210 | options->password_authentication = 1; | |
211 | if (options->kbd_interactive_authentication == -1) | |
212 | options->kbd_interactive_authentication = 0; | |
213 | if (options->challenge_response_authentication == -1) | |
214 | options->challenge_response_authentication = 1; | |
215 | if (options->permit_empty_passwd == -1) | |
216 | options->permit_empty_passwd = 0; | |
217 | if (options->permit_user_env == -1) | |
218 | options->permit_user_env = 0; | |
219 | if (options->use_login == -1) | |
220 | options->use_login = 0; | |
221 | if (options->compression == -1) | |
222 | options->compression = COMP_DELAYED; | |
223 | if (options->allow_tcp_forwarding == -1) | |
224 | options->allow_tcp_forwarding = 1; | |
225 | if (options->gateway_ports == -1) | |
226 | options->gateway_ports = 0; | |
227 | if (options->max_startups == -1) | |
228 | options->max_startups = 10; | |
229 | if (options->max_startups_rate == -1) | |
230 | options->max_startups_rate = 100; /* 100% */ | |
231 | if (options->max_startups_begin == -1) | |
232 | options->max_startups_begin = options->max_startups; | |
233 | if (options->max_authtries == -1) | |
234 | options->max_authtries = DEFAULT_AUTH_FAIL_MAX; | |
235 | if (options->use_dns == -1) | |
236 | options->use_dns = 1; | |
237 | if (options->client_alive_interval == -1) | |
238 | options->client_alive_interval = 0; | |
239 | if (options->client_alive_count_max == -1) | |
240 | options->client_alive_count_max = 3; | |
241 | if (options->authorized_keys_file2 == NULL) { | |
242 | /* authorized_keys_file2 falls back to authorized_keys_file */ | |
243 | if (options->authorized_keys_file != NULL) | |
244 | options->authorized_keys_file2 = options->authorized_keys_file; | |
245 | else | |
246 | options->authorized_keys_file2 = _PATH_SSH_USER_PERMITTED_KEYS2; | |
247 | } | |
248 | if (options->authorized_keys_file == NULL) | |
249 | options->authorized_keys_file = _PATH_SSH_USER_PERMITTED_KEYS; | |
250 | if (options->permit_tun == -1) | |
251 | options->permit_tun = SSH_TUNMODE_NO; | |
252 | ||
253 | /* Turn privilege separation on by default */ | |
254 | if (use_privsep == -1) | |
255 | use_privsep = 1; | |
256 | ||
257 | #ifndef HAVE_MMAP | |
258 | if (use_privsep && options->compression == 1) { | |
259 | error("This platform does not support both privilege " | |
260 | "separation and compression"); | |
261 | error("Compression disabled"); | |
262 | options->compression = 0; | |
263 | } | |
264 | #endif | |
265 | ||
266 | } | |
267 | ||
268 | /* Keyword tokens. */ | |
269 | typedef enum { | |
270 | sBadOption, /* == unknown option */ | |
271 | /* Portable-specific options */ | |
272 | sUsePAM, | |
273 | /* Standard Options */ | |
274 | sPort, sHostKeyFile, sServerKeyBits, sLoginGraceTime, sKeyRegenerationTime, | |
275 | sPermitRootLogin, sLogFacility, sLogLevel, | |
276 | sRhostsRSAAuthentication, sRSAAuthentication, | |
277 | sKerberosAuthentication, sKerberosOrLocalPasswd, sKerberosTicketCleanup, | |
278 | sKerberosGetAFSToken, | |
279 | sKerberosTgtPassing, sChallengeResponseAuthentication, | |
280 | sPasswordAuthentication, sKbdInteractiveAuthentication, | |
281 | sListenAddress, sAddressFamily, | |
282 | sPrintMotd, sPrintLastLog, sIgnoreRhosts, | |
283 | sX11Forwarding, sX11DisplayOffset, sX11UseLocalhost, | |
284 | sStrictModes, sEmptyPasswd, sTCPKeepAlive, | |
285 | sPermitUserEnvironment, sUseLogin, sAllowTcpForwarding, sCompression, | |
286 | sAllowUsers, sDenyUsers, sAllowGroups, sDenyGroups, | |
287 | sIgnoreUserKnownHosts, sCiphers, sMacs, sProtocol, sPidFile, | |
288 | sGatewayPorts, sPubkeyAuthentication, sXAuthLocation, sSubsystem, | |
289 | sMaxStartups, sMaxAuthTries, | |
290 | sBanner, sUseDNS, sHostbasedAuthentication, | |
291 | sHostbasedUsesNameFromPacketOnly, sClientAliveInterval, | |
292 | sClientAliveCountMax, sAuthorizedKeysFile, sAuthorizedKeysFile2, | |
293 | sGssAuthentication, sGssCleanupCreds, sAcceptEnv, sPermitTunnel, | |
294 | sMatch, sPermitOpen, sForceCommand, | |
295 | sUsePrivilegeSeparation, | |
296 | sDeprecated, sUnsupported | |
297 | } ServerOpCodes; | |
298 | ||
299 | #define SSHCFG_GLOBAL 0x01 /* allowed in main section of sshd_config */ | |
300 | #define SSHCFG_MATCH 0x02 /* allowed inside a Match section */ | |
301 | #define SSHCFG_ALL (SSHCFG_GLOBAL|SSHCFG_MATCH) | |
302 | ||
303 | /* Textual representation of the tokens. */ | |
304 | static struct { | |
305 | const char *name; | |
306 | ServerOpCodes opcode; | |
307 | u_int flags; | |
308 | } keywords[] = { | |
309 | /* Portable-specific options */ | |
310 | #ifdef USE_PAM | |
311 | { "usepam", sUsePAM, SSHCFG_GLOBAL }, | |
312 | #else | |
313 | { "usepam", sUnsupported, SSHCFG_GLOBAL }, | |
314 | #endif | |
315 | { "pamauthenticationviakbdint", sDeprecated, SSHCFG_GLOBAL }, | |
316 | /* Standard Options */ | |
317 | { "port", sPort, SSHCFG_GLOBAL }, | |
318 | { "hostkey", sHostKeyFile, SSHCFG_GLOBAL }, | |
319 | { "hostdsakey", sHostKeyFile, SSHCFG_GLOBAL }, /* alias */ | |
320 | { "pidfile", sPidFile, SSHCFG_GLOBAL }, | |
321 | { "serverkeybits", sServerKeyBits, SSHCFG_GLOBAL }, | |
322 | { "logingracetime", sLoginGraceTime, SSHCFG_GLOBAL }, | |
323 | { "keyregenerationinterval", sKeyRegenerationTime, SSHCFG_GLOBAL }, | |
324 | { "permitrootlogin", sPermitRootLogin, SSHCFG_GLOBAL }, | |
325 | { "syslogfacility", sLogFacility, SSHCFG_GLOBAL }, | |
326 | { "loglevel", sLogLevel, SSHCFG_GLOBAL }, | |
327 | { "rhostsauthentication", sDeprecated, SSHCFG_GLOBAL }, | |
328 | { "rhostsrsaauthentication", sRhostsRSAAuthentication, SSHCFG_GLOBAL }, | |
329 | { "hostbasedauthentication", sHostbasedAuthentication, SSHCFG_GLOBAL }, | |
330 | { "hostbasedusesnamefrompacketonly", sHostbasedUsesNameFromPacketOnly, SSHCFG_GLOBAL }, | |
331 | { "rsaauthentication", sRSAAuthentication, SSHCFG_GLOBAL }, | |
332 | { "pubkeyauthentication", sPubkeyAuthentication, SSHCFG_GLOBAL }, | |
333 | { "dsaauthentication", sPubkeyAuthentication, SSHCFG_GLOBAL }, /* alias */ | |
334 | #ifdef KRB5 | |
335 | { "kerberosauthentication", sKerberosAuthentication, SSHCFG_GLOBAL }, | |
336 | { "kerberosorlocalpasswd", sKerberosOrLocalPasswd, SSHCFG_GLOBAL }, | |
337 | { "kerberosticketcleanup", sKerberosTicketCleanup, SSHCFG_GLOBAL }, | |
338 | #ifdef USE_AFS | |
339 | { "kerberosgetafstoken", sKerberosGetAFSToken, SSHCFG_GLOBAL }, | |
340 | #else | |
341 | { "kerberosgetafstoken", sUnsupported, SSHCFG_GLOBAL }, | |
342 | #endif | |
343 | #else | |
344 | { "kerberosauthentication", sUnsupported, SSHCFG_GLOBAL }, | |
345 | { "kerberosorlocalpasswd", sUnsupported, SSHCFG_GLOBAL }, | |
346 | { "kerberosticketcleanup", sUnsupported, SSHCFG_GLOBAL }, | |
347 | { "kerberosgetafstoken", sUnsupported, SSHCFG_GLOBAL }, | |
348 | #endif | |
349 | { "kerberostgtpassing", sUnsupported, SSHCFG_GLOBAL }, | |
350 | { "afstokenpassing", sUnsupported, SSHCFG_GLOBAL }, | |
351 | #ifdef GSSAPI | |
352 | { "gssapiauthentication", sGssAuthentication, SSHCFG_GLOBAL }, | |
353 | { "gssapicleanupcredentials", sGssCleanupCreds, SSHCFG_GLOBAL }, | |
354 | #else | |
355 | { "gssapiauthentication", sUnsupported, SSHCFG_GLOBAL }, | |
356 | { "gssapicleanupcredentials", sUnsupported, SSHCFG_GLOBAL }, | |
357 | #endif | |
358 | { "passwordauthentication", sPasswordAuthentication, SSHCFG_GLOBAL }, | |
359 | { "kbdinteractiveauthentication", sKbdInteractiveAuthentication, SSHCFG_GLOBAL }, | |
360 | { "challengeresponseauthentication", sChallengeResponseAuthentication, SSHCFG_GLOBAL }, | |
361 | { "skeyauthentication", sChallengeResponseAuthentication, SSHCFG_GLOBAL }, /* alias */ | |
362 | { "checkmail", sDeprecated, SSHCFG_GLOBAL }, | |
363 | { "listenaddress", sListenAddress, SSHCFG_GLOBAL }, | |
364 | { "addressfamily", sAddressFamily, SSHCFG_GLOBAL }, | |
365 | { "printmotd", sPrintMotd, SSHCFG_GLOBAL }, | |
366 | { "printlastlog", sPrintLastLog, SSHCFG_GLOBAL }, | |
367 | { "ignorerhosts", sIgnoreRhosts, SSHCFG_GLOBAL }, | |
368 | { "ignoreuserknownhosts", sIgnoreUserKnownHosts, SSHCFG_GLOBAL }, | |
369 | { "x11forwarding", sX11Forwarding, SSHCFG_ALL }, | |
370 | { "x11displayoffset", sX11DisplayOffset, SSHCFG_ALL }, | |
371 | { "x11uselocalhost", sX11UseLocalhost, SSHCFG_ALL }, | |
372 | { "xauthlocation", sXAuthLocation, SSHCFG_GLOBAL }, | |
373 | { "strictmodes", sStrictModes, SSHCFG_GLOBAL }, | |
374 | { "permitemptypasswords", sEmptyPasswd, SSHCFG_GLOBAL }, | |
375 | { "permituserenvironment", sPermitUserEnvironment, SSHCFG_GLOBAL }, | |
376 | { "uselogin", sUseLogin, SSHCFG_GLOBAL }, | |
377 | { "compression", sCompression, SSHCFG_GLOBAL }, | |
378 | { "tcpkeepalive", sTCPKeepAlive, SSHCFG_GLOBAL }, | |
379 | { "keepalive", sTCPKeepAlive, SSHCFG_GLOBAL }, /* obsolete alias */ | |
380 | { "allowtcpforwarding", sAllowTcpForwarding, SSHCFG_ALL }, | |
381 | { "allowusers", sAllowUsers, SSHCFG_GLOBAL }, | |
382 | { "denyusers", sDenyUsers, SSHCFG_GLOBAL }, | |
383 | { "allowgroups", sAllowGroups, SSHCFG_GLOBAL }, | |
384 | { "denygroups", sDenyGroups, SSHCFG_GLOBAL }, | |
385 | { "ciphers", sCiphers, SSHCFG_GLOBAL }, | |
386 | { "macs", sMacs, SSHCFG_GLOBAL }, | |
387 | { "protocol", sProtocol, SSHCFG_GLOBAL }, | |
388 | { "gatewayports", sGatewayPorts, SSHCFG_ALL }, | |
389 | { "subsystem", sSubsystem, SSHCFG_GLOBAL }, | |
390 | { "maxstartups", sMaxStartups, SSHCFG_GLOBAL }, | |
391 | { "maxauthtries", sMaxAuthTries, SSHCFG_GLOBAL }, | |
392 | { "banner", sBanner, SSHCFG_GLOBAL }, | |
393 | { "usedns", sUseDNS, SSHCFG_GLOBAL }, | |
394 | { "verifyreversemapping", sDeprecated, SSHCFG_GLOBAL }, | |
395 | { "reversemappingcheck", sDeprecated, SSHCFG_GLOBAL }, | |
396 | { "clientaliveinterval", sClientAliveInterval, SSHCFG_GLOBAL }, | |
397 | { "clientalivecountmax", sClientAliveCountMax, SSHCFG_GLOBAL }, | |
398 | { "authorizedkeysfile", sAuthorizedKeysFile, SSHCFG_GLOBAL }, | |
399 | { "authorizedkeysfile2", sAuthorizedKeysFile2, SSHCFG_GLOBAL }, | |
400 | { "useprivilegeseparation", sUsePrivilegeSeparation, SSHCFG_GLOBAL }, | |
401 | { "acceptenv", sAcceptEnv, SSHCFG_GLOBAL }, | |
402 | { "permittunnel", sPermitTunnel, SSHCFG_GLOBAL }, | |
403 | { "match", sMatch, SSHCFG_ALL }, | |
404 | { "permitopen", sPermitOpen, SSHCFG_ALL }, | |
405 | { "forcecommand", sForceCommand, SSHCFG_ALL }, | |
406 | { NULL, sBadOption, 0 } | |
407 | }; | |
408 | ||
409 | /* | |
410 | * Returns the number of the token pointed to by cp or sBadOption. | |
411 | */ | |
412 | ||
413 | static ServerOpCodes | |
414 | parse_token(const char *cp, const char *filename, | |
415 | int linenum, u_int *flags) | |
416 | { | |
417 | u_int i; | |
418 | ||
419 | for (i = 0; keywords[i].name; i++) | |
420 | if (strcasecmp(cp, keywords[i].name) == 0) { | |
421 | *flags = keywords[i].flags; | |
422 | return keywords[i].opcode; | |
423 | } | |
424 | ||
425 | error("%s: line %d: Bad configuration option: %s", | |
426 | filename, linenum, cp); | |
427 | return sBadOption; | |
428 | } | |
429 | ||
430 | static void | |
431 | add_listen_addr(ServerOptions *options, char *addr, u_short port) | |
432 | { | |
433 | u_int i; | |
434 | ||
435 | if (options->num_ports == 0) | |
436 | options->ports[options->num_ports++] = SSH_DEFAULT_PORT; | |
437 | if (options->address_family == -1) | |
438 | options->address_family = AF_UNSPEC; | |
439 | if (port == 0) | |
440 | for (i = 0; i < options->num_ports; i++) | |
441 | add_one_listen_addr(options, addr, options->ports[i]); | |
442 | else | |
443 | add_one_listen_addr(options, addr, port); | |
444 | } | |
445 | ||
446 | static void | |
447 | add_one_listen_addr(ServerOptions *options, char *addr, u_short port) | |
448 | { | |
449 | struct addrinfo hints, *ai, *aitop; | |
450 | char strport[NI_MAXSERV]; | |
451 | int gaierr; | |
452 | ||
453 | memset(&hints, 0, sizeof(hints)); | |
454 | hints.ai_family = options->address_family; | |
455 | hints.ai_socktype = SOCK_STREAM; | |
456 | hints.ai_flags = (addr == NULL) ? AI_PASSIVE : 0; | |
457 | snprintf(strport, sizeof strport, "%u", port); | |
458 | if ((gaierr = getaddrinfo(addr, strport, &hints, &aitop)) != 0) | |
459 | fatal("bad addr or host: %s (%s)", | |
460 | addr ? addr : "<NULL>", | |
461 | gai_strerror(gaierr)); | |
462 | for (ai = aitop; ai->ai_next; ai = ai->ai_next) | |
463 | ; | |
464 | ai->ai_next = options->listen_addrs; | |
465 | options->listen_addrs = aitop; | |
466 | } | |
467 | ||
468 | /* | |
469 | * The strategy for the Match blocks is that the config file is parsed twice. | |
470 | * | |
471 | * The first time is at startup. activep is initialized to 1 and the | |
472 | * directives in the global context are processed and acted on. Hitting a | |
473 | * Match directive unsets activep and the directives inside the block are | |
474 | * checked for syntax only. | |
475 | * | |
476 | * The second time is after a connection has been established but before | |
477 | * authentication. activep is initialized to 2 and global config directives | |
478 | * are ignored since they have already been processed. If the criteria in a | |
479 | * Match block is met, activep is set and the subsequent directives | |
480 | * processed and actioned until EOF or another Match block unsets it. Any | |
481 | * options set are copied into the main server config. | |
482 | * | |
483 | * Potential additions/improvements: | |
484 | * - Add Match support for pre-kex directives, eg Protocol, Ciphers. | |
485 | * | |
486 | * - Add a Tag directive (idea from David Leonard) ala pf, eg: | |
487 | * Match Address 192.168.0.* | |
488 | * Tag trusted | |
489 | * Match Group wheel | |
490 | * Tag trusted | |
491 | * Match Tag trusted | |
492 | * AllowTcpForwarding yes | |
493 | * GatewayPorts clientspecified | |
494 | * [...] | |
495 | * | |
496 | * - Add a PermittedChannelRequests directive | |
497 | * Match Group shell | |
498 | * PermittedChannelRequests session,forwarded-tcpip | |
499 | */ | |
500 | ||
501 | static int | |
502 | match_cfg_line_group(const char *grps, int line, const char *user) | |
503 | { | |
504 | int result = 0; | |
505 | u_int ngrps = 0; | |
506 | char *arg, *p, *cp, *grplist[MAX_MATCH_GROUPS]; | |
507 | struct passwd *pw; | |
508 | ||
509 | /* | |
510 | * Even if we do not have a user yet, we still need to check for | |
511 | * valid syntax. | |
512 | */ | |
513 | arg = cp = xstrdup(grps); | |
514 | while ((p = strsep(&cp, ",")) != NULL && *p != '\0') { | |
515 | if (ngrps >= MAX_MATCH_GROUPS) { | |
516 | error("line %d: too many groups in Match Group", line); | |
517 | result = -1; | |
518 | goto out; | |
519 | } | |
520 | grplist[ngrps++] = p; | |
521 | } | |
522 | ||
523 | if (user == NULL) | |
524 | goto out; | |
525 | ||
526 | if ((pw = getpwnam(user)) == NULL) { | |
527 | debug("Can't match group at line %d because user %.100s does " | |
528 | "not exist", line, user); | |
529 | } else if (ga_init(pw->pw_name, pw->pw_gid) == 0) { | |
530 | debug("Can't Match group because user %.100s not in any group " | |
531 | "at line %d", user, line); | |
532 | } else if (ga_match(grplist, ngrps) != 1) { | |
533 | debug("user %.100s does not match group %.100s at line %d", | |
534 | user, arg, line); | |
535 | } else { | |
536 | debug("user %.100s matched group %.100s at line %d", user, | |
537 | arg, line); | |
538 | result = 1; | |
539 | } | |
540 | out: | |
541 | ga_free(); | |
542 | xfree(arg); | |
543 | return result; | |
544 | } | |
545 | ||
546 | static int | |
547 | match_cfg_line(char **condition, int line, const char *user, const char *host, | |
548 | const char *address) | |
549 | { | |
550 | int result = 1; | |
551 | char *arg, *attrib, *cp = *condition; | |
552 | size_t len; | |
553 | ||
554 | if (user == NULL) | |
555 | debug3("checking syntax for 'Match %s'", cp); | |
556 | else | |
557 | debug3("checking match for '%s' user %s host %s addr %s", cp, | |
558 | user ? user : "(null)", host ? host : "(null)", | |
559 | address ? address : "(null)"); | |
560 | ||
561 | while ((attrib = strdelim(&cp)) && *attrib != '\0') { | |
562 | if ((arg = strdelim(&cp)) == NULL || *arg == '\0') { | |
563 | error("Missing Match criteria for %s", attrib); | |
564 | return -1; | |
565 | } | |
566 | len = strlen(arg); | |
567 | if (strcasecmp(attrib, "user") == 0) { | |
568 | if (!user) { | |
569 | result = 0; | |
570 | continue; | |
571 | } | |
572 | if (match_pattern_list(user, arg, len, 0) != 1) | |
573 | result = 0; | |
574 | else | |
575 | debug("user %.100s matched 'User %.100s' at " | |
576 | "line %d", user, arg, line); | |
577 | } else if (strcasecmp(attrib, "group") == 0) { | |
578 | switch (match_cfg_line_group(arg, line, user)) { | |
579 | case -1: | |
580 | return -1; | |
581 | case 0: | |
582 | result = 0; | |
583 | } | |
584 | } else if (strcasecmp(attrib, "host") == 0) { | |
585 | if (!host) { | |
586 | result = 0; | |
587 | continue; | |
588 | } | |
589 | if (match_hostname(host, arg, len) != 1) | |
590 | result = 0; | |
591 | else | |
592 | debug("connection from %.100s matched 'Host " | |
593 | "%.100s' at line %d", host, arg, line); | |
594 | } else if (strcasecmp(attrib, "address") == 0) { | |
595 | debug("address '%s' arg '%s'", address, arg); | |
596 | if (!address) { | |
597 | result = 0; | |
598 | continue; | |
599 | } | |
600 | if (match_hostname(address, arg, len) != 1) | |
601 | result = 0; | |
602 | else | |
603 | debug("connection from %.100s matched 'Address " | |
604 | "%.100s' at line %d", address, arg, line); | |
605 | } else { | |
606 | error("Unsupported Match attribute %s", attrib); | |
607 | return -1; | |
608 | } | |
609 | } | |
610 | if (user != NULL) | |
611 | debug3("match %sfound", result ? "" : "not "); | |
612 | *condition = cp; | |
613 | return result; | |
614 | } | |
615 | ||
616 | #define WHITESPACE " \t\r\n" | |
617 | ||
618 | int | |
619 | process_server_config_line(ServerOptions *options, char *line, | |
620 | const char *filename, int linenum, int *activep, const char *user, | |
621 | const char *host, const char *address) | |
622 | { | |
623 | char *cp, **charptr, *arg, *p; | |
624 | int cmdline = 0, *intptr, value, n; | |
625 | ServerOpCodes opcode; | |
626 | u_short port; | |
627 | u_int i, flags = 0; | |
628 | size_t len; | |
629 | ||
630 | cp = line; | |
631 | if ((arg = strdelim(&cp)) == NULL) | |
632 | return 0; | |
633 | /* Ignore leading whitespace */ | |
634 | if (*arg == '\0') | |
635 | arg = strdelim(&cp); | |
636 | if (!arg || !*arg || *arg == '#') | |
637 | return 0; | |
638 | intptr = NULL; | |
639 | charptr = NULL; | |
640 | opcode = parse_token(arg, filename, linenum, &flags); | |
641 | ||
642 | if (activep == NULL) { /* We are processing a command line directive */ | |
643 | cmdline = 1; | |
644 | activep = &cmdline; | |
645 | } | |
646 | if (*activep && opcode != sMatch) | |
647 | debug3("%s:%d setting %s %s", filename, linenum, arg, cp); | |
648 | if (*activep == 0 && !(flags & SSHCFG_MATCH)) { | |
649 | if (user == NULL) { | |
650 | fatal("%s line %d: Directive '%s' is not allowed " | |
651 | "within a Match block", filename, linenum, arg); | |
652 | } else { /* this is a directive we have already processed */ | |
653 | while (arg) | |
654 | arg = strdelim(&cp); | |
655 | return 0; | |
656 | } | |
657 | } | |
658 | ||
659 | switch (opcode) { | |
660 | /* Portable-specific options */ | |
661 | case sUsePAM: | |
662 | intptr = &options->use_pam; | |
663 | goto parse_flag; | |
664 | ||
665 | /* Standard Options */ | |
666 | case sBadOption: | |
667 | return -1; | |
668 | case sPort: | |
669 | /* ignore ports from configfile if cmdline specifies ports */ | |
670 | if (options->ports_from_cmdline) | |
671 | return 0; | |
672 | if (options->listen_addrs != NULL) | |
673 | fatal("%s line %d: ports must be specified before " | |
674 | "ListenAddress.", filename, linenum); | |
675 | if (options->num_ports >= MAX_PORTS) | |
676 | fatal("%s line %d: too many ports.", | |
677 | filename, linenum); | |
678 | arg = strdelim(&cp); | |
679 | if (!arg || *arg == '\0') | |
680 | fatal("%s line %d: missing port number.", | |
681 | filename, linenum); | |
682 | options->ports[options->num_ports++] = a2port(arg); | |
683 | if (options->ports[options->num_ports-1] == 0) | |
684 | fatal("%s line %d: Badly formatted port number.", | |
685 | filename, linenum); | |
686 | break; | |
687 | ||
688 | case sServerKeyBits: | |
689 | intptr = &options->server_key_bits; | |
690 | parse_int: | |
691 | arg = strdelim(&cp); | |
692 | if (!arg || *arg == '\0') | |
693 | fatal("%s line %d: missing integer value.", | |
694 | filename, linenum); | |
695 | value = atoi(arg); | |
696 | if (*activep && *intptr == -1) | |
697 | *intptr = value; | |
698 | break; | |
699 | ||
700 | case sLoginGraceTime: | |
701 | intptr = &options->login_grace_time; | |
702 | parse_time: | |
703 | arg = strdelim(&cp); | |
704 | if (!arg || *arg == '\0') | |
705 | fatal("%s line %d: missing time value.", | |
706 | filename, linenum); | |
707 | if ((value = convtime(arg)) == -1) | |
708 | fatal("%s line %d: invalid time value.", | |
709 | filename, linenum); | |
710 | if (*intptr == -1) | |
711 | *intptr = value; | |
712 | break; | |
713 | ||
714 | case sKeyRegenerationTime: | |
715 | intptr = &options->key_regeneration_time; | |
716 | goto parse_time; | |
717 | ||
718 | case sListenAddress: | |
719 | arg = strdelim(&cp); | |
720 | if (arg == NULL || *arg == '\0') | |
721 | fatal("%s line %d: missing address", | |
722 | filename, linenum); | |
723 | /* check for bare IPv6 address: no "[]" and 2 or more ":" */ | |
724 | if (strchr(arg, '[') == NULL && (p = strchr(arg, ':')) != NULL | |
725 | && strchr(p+1, ':') != NULL) { | |
726 | add_listen_addr(options, arg, 0); | |
727 | break; | |
728 | } | |
729 | p = hpdelim(&arg); | |
730 | if (p == NULL) | |
731 | fatal("%s line %d: bad address:port usage", | |
732 | filename, linenum); | |
733 | p = cleanhostname(p); | |
734 | if (arg == NULL) | |
735 | port = 0; | |
736 | else if ((port = a2port(arg)) == 0) | |
737 | fatal("%s line %d: bad port number", filename, linenum); | |
738 | ||
739 | add_listen_addr(options, p, port); | |
740 | ||
741 | break; | |
742 | ||
743 | case sAddressFamily: | |
744 | arg = strdelim(&cp); | |
745 | if (!arg || *arg == '\0') | |
746 | fatal("%s line %d: missing address family.", | |
747 | filename, linenum); | |
748 | intptr = &options->address_family; | |
749 | if (options->listen_addrs != NULL) | |
750 | fatal("%s line %d: address family must be specified before " | |
751 | "ListenAddress.", filename, linenum); | |
752 | if (strcasecmp(arg, "inet") == 0) | |
753 | value = AF_INET; | |
754 | else if (strcasecmp(arg, "inet6") == 0) | |
755 | value = AF_INET6; | |
756 | else if (strcasecmp(arg, "any") == 0) | |
757 | value = AF_UNSPEC; | |
758 | else | |
759 | fatal("%s line %d: unsupported address family \"%s\".", | |
760 | filename, linenum, arg); | |
761 | if (*intptr == -1) | |
762 | *intptr = value; | |
763 | break; | |
764 | ||
765 | case sHostKeyFile: | |
766 | intptr = &options->num_host_key_files; | |
767 | if (*intptr >= MAX_HOSTKEYS) | |
768 | fatal("%s line %d: too many host keys specified (max %d).", | |
769 | filename, linenum, MAX_HOSTKEYS); | |
770 | charptr = &options->host_key_files[*intptr]; | |
771 | parse_filename: | |
772 | arg = strdelim(&cp); | |
773 | if (!arg || *arg == '\0') | |
774 | fatal("%s line %d: missing file name.", | |
775 | filename, linenum); | |
776 | if (*activep && *charptr == NULL) { | |
777 | *charptr = tilde_expand_filename(arg, getuid()); | |
778 | /* increase optional counter */ | |
779 | if (intptr != NULL) | |
780 | *intptr = *intptr + 1; | |
781 | } | |
782 | break; | |
783 | ||
784 | case sPidFile: | |
785 | charptr = &options->pid_file; | |
786 | goto parse_filename; | |
787 | ||
788 | case sPermitRootLogin: | |
789 | intptr = &options->permit_root_login; | |
790 | arg = strdelim(&cp); | |
791 | if (!arg || *arg == '\0') | |
792 | fatal("%s line %d: missing yes/" | |
793 | "without-password/forced-commands-only/no " | |
794 | "argument.", filename, linenum); | |
795 | value = 0; /* silence compiler */ | |
796 | if (strcmp(arg, "without-password") == 0) | |
797 | value = PERMIT_NO_PASSWD; | |
798 | else if (strcmp(arg, "forced-commands-only") == 0) | |
799 | value = PERMIT_FORCED_ONLY; | |
800 | else if (strcmp(arg, "yes") == 0) | |
801 | value = PERMIT_YES; | |
802 | else if (strcmp(arg, "no") == 0) | |
803 | value = PERMIT_NO; | |
804 | else | |
805 | fatal("%s line %d: Bad yes/" | |
806 | "without-password/forced-commands-only/no " | |
807 | "argument: %s", filename, linenum, arg); | |
808 | if (*intptr == -1) | |
809 | *intptr = value; | |
810 | break; | |
811 | ||
812 | case sIgnoreRhosts: | |
813 | intptr = &options->ignore_rhosts; | |
814 | parse_flag: | |
815 | arg = strdelim(&cp); | |
816 | if (!arg || *arg == '\0') | |
817 | fatal("%s line %d: missing yes/no argument.", | |
818 | filename, linenum); | |
819 | value = 0; /* silence compiler */ | |
820 | if (strcmp(arg, "yes") == 0) | |
821 | value = 1; | |
822 | else if (strcmp(arg, "no") == 0) | |
823 | value = 0; | |
824 | else | |
825 | fatal("%s line %d: Bad yes/no argument: %s", | |
826 | filename, linenum, arg); | |
827 | if (*activep && *intptr == -1) | |
828 | *intptr = value; | |
829 | break; | |
830 | ||
831 | case sIgnoreUserKnownHosts: | |
832 | intptr = &options->ignore_user_known_hosts; | |
833 | goto parse_flag; | |
834 | ||
835 | case sRhostsRSAAuthentication: | |
836 | intptr = &options->rhosts_rsa_authentication; | |
837 | goto parse_flag; | |
838 | ||
839 | case sHostbasedAuthentication: | |
840 | intptr = &options->hostbased_authentication; | |
841 | goto parse_flag; | |
842 | ||
843 | case sHostbasedUsesNameFromPacketOnly: | |
844 | intptr = &options->hostbased_uses_name_from_packet_only; | |
845 | goto parse_flag; | |
846 | ||
847 | case sRSAAuthentication: | |
848 | intptr = &options->rsa_authentication; | |
849 | goto parse_flag; | |
850 | ||
851 | case sPubkeyAuthentication: | |
852 | intptr = &options->pubkey_authentication; | |
853 | goto parse_flag; | |
854 | ||
855 | case sKerberosAuthentication: | |
856 | intptr = &options->kerberos_authentication; | |
857 | goto parse_flag; | |
858 | ||
859 | case sKerberosOrLocalPasswd: | |
860 | intptr = &options->kerberos_or_local_passwd; | |
861 | goto parse_flag; | |
862 | ||
863 | case sKerberosTicketCleanup: | |
864 | intptr = &options->kerberos_ticket_cleanup; | |
865 | goto parse_flag; | |
866 | ||
867 | case sKerberosGetAFSToken: | |
868 | intptr = &options->kerberos_get_afs_token; | |
869 | goto parse_flag; | |
870 | ||
871 | case sGssAuthentication: | |
872 | intptr = &options->gss_authentication; | |
873 | goto parse_flag; | |
874 | ||
875 | case sGssCleanupCreds: | |
876 | intptr = &options->gss_cleanup_creds; | |
877 | goto parse_flag; | |
878 | ||
879 | case sPasswordAuthentication: | |
880 | intptr = &options->password_authentication; | |
881 | goto parse_flag; | |
882 | ||
883 | case sKbdInteractiveAuthentication: | |
884 | intptr = &options->kbd_interactive_authentication; | |
885 | goto parse_flag; | |
886 | ||
887 | case sChallengeResponseAuthentication: | |
888 | intptr = &options->challenge_response_authentication; | |
889 | goto parse_flag; | |
890 | ||
891 | case sPrintMotd: | |
892 | intptr = &options->print_motd; | |
893 | goto parse_flag; | |
894 | ||
895 | case sPrintLastLog: | |
896 | intptr = &options->print_lastlog; | |
897 | goto parse_flag; | |
898 | ||
899 | case sX11Forwarding: | |
900 | intptr = &options->x11_forwarding; | |
901 | goto parse_flag; | |
902 | ||
903 | case sX11DisplayOffset: | |
904 | intptr = &options->x11_display_offset; | |
905 | goto parse_int; | |
906 | ||
907 | case sX11UseLocalhost: | |
908 | intptr = &options->x11_use_localhost; | |
909 | goto parse_flag; | |
910 | ||
911 | case sXAuthLocation: | |
912 | charptr = &options->xauth_location; | |
913 | goto parse_filename; | |
914 | ||
915 | case sStrictModes: | |
916 | intptr = &options->strict_modes; | |
917 | goto parse_flag; | |
918 | ||
919 | case sTCPKeepAlive: | |
920 | intptr = &options->tcp_keep_alive; | |
921 | goto parse_flag; | |
922 | ||
923 | case sEmptyPasswd: | |
924 | intptr = &options->permit_empty_passwd; | |
925 | goto parse_flag; | |
926 | ||
927 | case sPermitUserEnvironment: | |
928 | intptr = &options->permit_user_env; | |
929 | goto parse_flag; | |
930 | ||
931 | case sUseLogin: | |
932 | intptr = &options->use_login; | |
933 | goto parse_flag; | |
934 | ||
935 | case sCompression: | |
936 | intptr = &options->compression; | |
937 | arg = strdelim(&cp); | |
938 | if (!arg || *arg == '\0') | |
939 | fatal("%s line %d: missing yes/no/delayed " | |
940 | "argument.", filename, linenum); | |
941 | value = 0; /* silence compiler */ | |
942 | if (strcmp(arg, "delayed") == 0) | |
943 | value = COMP_DELAYED; | |
944 | else if (strcmp(arg, "yes") == 0) | |
945 | value = COMP_ZLIB; | |
946 | else if (strcmp(arg, "no") == 0) | |
947 | value = COMP_NONE; | |
948 | else | |
949 | fatal("%s line %d: Bad yes/no/delayed " | |
950 | "argument: %s", filename, linenum, arg); | |
951 | if (*intptr == -1) | |
952 | *intptr = value; | |
953 | break; | |
954 | ||
955 | case sGatewayPorts: | |
956 | intptr = &options->gateway_ports; | |
957 | arg = strdelim(&cp); | |
958 | if (!arg || *arg == '\0') | |
959 | fatal("%s line %d: missing yes/no/clientspecified " | |
960 | "argument.", filename, linenum); | |
961 | value = 0; /* silence compiler */ | |
962 | if (strcmp(arg, "clientspecified") == 0) | |
963 | value = 2; | |
964 | else if (strcmp(arg, "yes") == 0) | |
965 | value = 1; | |
966 | else if (strcmp(arg, "no") == 0) | |
967 | value = 0; | |
968 | else | |
969 | fatal("%s line %d: Bad yes/no/clientspecified " | |
970 | "argument: %s", filename, linenum, arg); | |
971 | if (*intptr == -1) | |
972 | *intptr = value; | |
973 | break; | |
974 | ||
975 | case sUseDNS: | |
976 | intptr = &options->use_dns; | |
977 | goto parse_flag; | |
978 | ||
979 | case sLogFacility: | |
980 | intptr = (int *) &options->log_facility; | |
981 | arg = strdelim(&cp); | |
982 | value = log_facility_number(arg); | |
983 | if (value == SYSLOG_FACILITY_NOT_SET) | |
984 | fatal("%.200s line %d: unsupported log facility '%s'", | |
985 | filename, linenum, arg ? arg : "<NONE>"); | |
986 | if (*intptr == -1) | |
987 | *intptr = (SyslogFacility) value; | |
988 | break; | |
989 | ||
990 | case sLogLevel: | |
991 | intptr = (int *) &options->log_level; | |
992 | arg = strdelim(&cp); | |
993 | value = log_level_number(arg); | |
994 | if (value == SYSLOG_LEVEL_NOT_SET) | |
995 | fatal("%.200s line %d: unsupported log level '%s'", | |
996 | filename, linenum, arg ? arg : "<NONE>"); | |
997 | if (*intptr == -1) | |
998 | *intptr = (LogLevel) value; | |
999 | break; | |
1000 | ||
1001 | case sAllowTcpForwarding: | |
1002 | intptr = &options->allow_tcp_forwarding; | |
1003 | goto parse_flag; | |
1004 | ||
1005 | case sUsePrivilegeSeparation: | |
1006 | intptr = &use_privsep; | |
1007 | goto parse_flag; | |
1008 | ||
1009 | case sAllowUsers: | |
1010 | while ((arg = strdelim(&cp)) && *arg != '\0') { | |
1011 | if (options->num_allow_users >= MAX_ALLOW_USERS) | |
1012 | fatal("%s line %d: too many allow users.", | |
1013 | filename, linenum); | |
1014 | options->allow_users[options->num_allow_users++] = | |
1015 | xstrdup(arg); | |
1016 | } | |
1017 | break; | |
1018 | ||
1019 | case sDenyUsers: | |
1020 | while ((arg = strdelim(&cp)) && *arg != '\0') { | |
1021 | if (options->num_deny_users >= MAX_DENY_USERS) | |
1022 | fatal("%s line %d: too many deny users.", | |
1023 | filename, linenum); | |
1024 | options->deny_users[options->num_deny_users++] = | |
1025 | xstrdup(arg); | |
1026 | } | |
1027 | break; | |
1028 | ||
1029 | case sAllowGroups: | |
1030 | while ((arg = strdelim(&cp)) && *arg != '\0') { | |
1031 | if (options->num_allow_groups >= MAX_ALLOW_GROUPS) | |
1032 | fatal("%s line %d: too many allow groups.", | |
1033 | filename, linenum); | |
1034 | options->allow_groups[options->num_allow_groups++] = | |
1035 | xstrdup(arg); | |
1036 | } | |
1037 | break; | |
1038 | ||
1039 | case sDenyGroups: | |
1040 | while ((arg = strdelim(&cp)) && *arg != '\0') { | |
1041 | if (options->num_deny_groups >= MAX_DENY_GROUPS) | |
1042 | fatal("%s line %d: too many deny groups.", | |
1043 | filename, linenum); | |
1044 | options->deny_groups[options->num_deny_groups++] = xstrdup(arg); | |
1045 | } | |
1046 | break; | |
1047 | ||
1048 | case sCiphers: | |
1049 | arg = strdelim(&cp); | |
1050 | if (!arg || *arg == '\0') | |
1051 | fatal("%s line %d: Missing argument.", filename, linenum); | |
1052 | if (!ciphers_valid(arg)) | |
1053 | fatal("%s line %d: Bad SSH2 cipher spec '%s'.", | |
1054 | filename, linenum, arg ? arg : "<NONE>"); | |
1055 | if (options->ciphers == NULL) | |
1056 | options->ciphers = xstrdup(arg); | |
1057 | break; | |
1058 | ||
1059 | case sMacs: | |
1060 | arg = strdelim(&cp); | |
1061 | if (!arg || *arg == '\0') | |
1062 | fatal("%s line %d: Missing argument.", filename, linenum); | |
1063 | if (!mac_valid(arg)) | |
1064 | fatal("%s line %d: Bad SSH2 mac spec '%s'.", | |
1065 | filename, linenum, arg ? arg : "<NONE>"); | |
1066 | if (options->macs == NULL) | |
1067 | options->macs = xstrdup(arg); | |
1068 | break; | |
1069 | ||
1070 | case sProtocol: | |
1071 | intptr = &options->protocol; | |
1072 | arg = strdelim(&cp); | |
1073 | if (!arg || *arg == '\0') | |
1074 | fatal("%s line %d: Missing argument.", filename, linenum); | |
1075 | value = proto_spec(arg); | |
1076 | if (value == SSH_PROTO_UNKNOWN) | |
1077 | fatal("%s line %d: Bad protocol spec '%s'.", | |
1078 | filename, linenum, arg ? arg : "<NONE>"); | |
1079 | if (*intptr == SSH_PROTO_UNKNOWN) | |
1080 | *intptr = value; | |
1081 | break; | |
1082 | ||
1083 | case sSubsystem: | |
1084 | if (options->num_subsystems >= MAX_SUBSYSTEMS) { | |
1085 | fatal("%s line %d: too many subsystems defined.", | |
1086 | filename, linenum); | |
1087 | } | |
1088 | arg = strdelim(&cp); | |
1089 | if (!arg || *arg == '\0') | |
1090 | fatal("%s line %d: Missing subsystem name.", | |
1091 | filename, linenum); | |
1092 | if (!*activep) { | |
1093 | arg = strdelim(&cp); | |
1094 | break; | |
1095 | } | |
1096 | for (i = 0; i < options->num_subsystems; i++) | |
1097 | if (strcmp(arg, options->subsystem_name[i]) == 0) | |
1098 | fatal("%s line %d: Subsystem '%s' already defined.", | |
1099 | filename, linenum, arg); | |
1100 | options->subsystem_name[options->num_subsystems] = xstrdup(arg); | |
1101 | arg = strdelim(&cp); | |
1102 | if (!arg || *arg == '\0') | |
1103 | fatal("%s line %d: Missing subsystem command.", | |
1104 | filename, linenum); | |
1105 | options->subsystem_command[options->num_subsystems] = xstrdup(arg); | |
1106 | ||
1107 | /* Collect arguments (separate to executable) */ | |
1108 | p = xstrdup(arg); | |
1109 | len = strlen(p) + 1; | |
1110 | while ((arg = strdelim(&cp)) != NULL && *arg != '\0') { | |
1111 | len += 1 + strlen(arg); | |
1112 | p = xrealloc(p, 1, len); | |
1113 | strlcat(p, " ", len); | |
1114 | strlcat(p, arg, len); | |
1115 | } | |
1116 | options->subsystem_args[options->num_subsystems] = p; | |
1117 | options->num_subsystems++; | |
1118 | break; | |
1119 | ||
1120 | case sMaxStartups: | |
1121 | arg = strdelim(&cp); | |
1122 | if (!arg || *arg == '\0') | |
1123 | fatal("%s line %d: Missing MaxStartups spec.", | |
1124 | filename, linenum); | |
1125 | if ((n = sscanf(arg, "%d:%d:%d", | |
1126 | &options->max_startups_begin, | |
1127 | &options->max_startups_rate, | |
1128 | &options->max_startups)) == 3) { | |
1129 | if (options->max_startups_begin > | |
1130 | options->max_startups || | |
1131 | options->max_startups_rate > 100 || | |
1132 | options->max_startups_rate < 1) | |
1133 | fatal("%s line %d: Illegal MaxStartups spec.", | |
1134 | filename, linenum); | |
1135 | } else if (n != 1) | |
1136 | fatal("%s line %d: Illegal MaxStartups spec.", | |
1137 | filename, linenum); | |
1138 | else | |
1139 | options->max_startups = options->max_startups_begin; | |
1140 | break; | |
1141 | ||
1142 | case sMaxAuthTries: | |
1143 | intptr = &options->max_authtries; | |
1144 | goto parse_int; | |
1145 | ||
1146 | case sBanner: | |
1147 | charptr = &options->banner; | |
1148 | goto parse_filename; | |
1149 | /* | |
1150 | * These options can contain %X options expanded at | |
1151 | * connect time, so that you can specify paths like: | |
1152 | * | |
1153 | * AuthorizedKeysFile /etc/ssh_keys/%u | |
1154 | */ | |
1155 | case sAuthorizedKeysFile: | |
1156 | case sAuthorizedKeysFile2: | |
1157 | charptr = (opcode == sAuthorizedKeysFile) ? | |
1158 | &options->authorized_keys_file : | |
1159 | &options->authorized_keys_file2; | |
1160 | goto parse_filename; | |
1161 | ||
1162 | case sClientAliveInterval: | |
1163 | intptr = &options->client_alive_interval; | |
1164 | goto parse_time; | |
1165 | ||
1166 | case sClientAliveCountMax: | |
1167 | intptr = &options->client_alive_count_max; | |
1168 | goto parse_int; | |
1169 | ||
1170 | case sAcceptEnv: | |
1171 | while ((arg = strdelim(&cp)) && *arg != '\0') { | |
1172 | if (strchr(arg, '=') != NULL) | |
1173 | fatal("%s line %d: Invalid environment name.", | |
1174 | filename, linenum); | |
1175 | if (options->num_accept_env >= MAX_ACCEPT_ENV) | |
1176 | fatal("%s line %d: too many allow env.", | |
1177 | filename, linenum); | |
1178 | if (!*activep) | |
1179 | break; | |
1180 | options->accept_env[options->num_accept_env++] = | |
1181 | xstrdup(arg); | |
1182 | } | |
1183 | break; | |
1184 | ||
1185 | case sPermitTunnel: | |
1186 | intptr = &options->permit_tun; | |
1187 | arg = strdelim(&cp); | |
1188 | if (!arg || *arg == '\0') | |
1189 | fatal("%s line %d: Missing yes/point-to-point/" | |
1190 | "ethernet/no argument.", filename, linenum); | |
1191 | value = 0; /* silence compiler */ | |
1192 | if (strcasecmp(arg, "ethernet") == 0) | |
1193 | value = SSH_TUNMODE_ETHERNET; | |
1194 | else if (strcasecmp(arg, "point-to-point") == 0) | |
1195 | value = SSH_TUNMODE_POINTOPOINT; | |
1196 | else if (strcasecmp(arg, "yes") == 0) | |
1197 | value = SSH_TUNMODE_YES; | |
1198 | else if (strcasecmp(arg, "no") == 0) | |
1199 | value = SSH_TUNMODE_NO; | |
1200 | else | |
1201 | fatal("%s line %d: Bad yes/point-to-point/ethernet/" | |
1202 | "no argument: %s", filename, linenum, arg); | |
1203 | if (*intptr == -1) | |
1204 | *intptr = value; | |
1205 | break; | |
1206 | ||
1207 | case sMatch: | |
1208 | if (cmdline) | |
1209 | fatal("Match directive not supported as a command-line " | |
1210 | "option"); | |
1211 | value = match_cfg_line(&cp, linenum, user, host, address); | |
1212 | if (value < 0) | |
1213 | fatal("%s line %d: Bad Match condition", filename, | |
1214 | linenum); | |
1215 | *activep = value; | |
1216 | break; | |
1217 | ||
1218 | case sPermitOpen: | |
1219 | arg = strdelim(&cp); | |
1220 | if (!arg || *arg == '\0') | |
1221 | fatal("%s line %d: missing PermitOpen specification", | |
1222 | filename, linenum); | |
1223 | if (strcmp(arg, "any") == 0) { | |
1224 | if (*activep) { | |
1225 | channel_clear_adm_permitted_opens(); | |
1226 | options->num_permitted_opens = 0; | |
1227 | } | |
1228 | break; | |
1229 | } | |
1230 | n = options->num_permitted_opens; /* modified later */ | |
1231 | if (*activep && n == -1) | |
1232 | channel_clear_adm_permitted_opens(); | |
1233 | for (; arg != NULL && *arg != '\0'; arg = strdelim(&cp)) { | |
1234 | p = hpdelim(&arg); | |
1235 | if (p == NULL) | |
1236 | fatal("%s line %d: missing host in PermitOpen", | |
1237 | filename, linenum); | |
1238 | p = cleanhostname(p); | |
1239 | if (arg == NULL || (port = a2port(arg)) == 0) | |
1240 | fatal("%s line %d: bad port number in " | |
1241 | "PermitOpen", filename, linenum); | |
1242 | if (*activep && n == -1) | |
1243 | options->num_permitted_opens = | |
1244 | channel_add_adm_permitted_opens(p, port); | |
1245 | } | |
1246 | break; | |
1247 | ||
1248 | case sForceCommand: | |
1249 | if (cp == NULL) | |
1250 | fatal("%.200s line %d: Missing argument.", filename, | |
1251 | linenum); | |
1252 | len = strspn(cp, WHITESPACE); | |
1253 | if (*activep && options->adm_forced_command == NULL) | |
1254 | options->adm_forced_command = xstrdup(cp + len); | |
1255 | return 0; | |
1256 | ||
1257 | case sDeprecated: | |
1258 | logit("%s line %d: Deprecated option %s", | |
1259 | filename, linenum, arg); | |
1260 | while (arg) | |
1261 | arg = strdelim(&cp); | |
1262 | break; | |
1263 | ||
1264 | case sUnsupported: | |
1265 | logit("%s line %d: Unsupported option %s", | |
1266 | filename, linenum, arg); | |
1267 | while (arg) | |
1268 | arg = strdelim(&cp); | |
1269 | break; | |
1270 | ||
1271 | default: | |
1272 | fatal("%s line %d: Missing handler for opcode %s (%d)", | |
1273 | filename, linenum, arg, opcode); | |
1274 | } | |
1275 | if ((arg = strdelim(&cp)) != NULL && *arg != '\0') | |
1276 | fatal("%s line %d: garbage at end of line; \"%.200s\".", | |
1277 | filename, linenum, arg); | |
1278 | return 0; | |
1279 | } | |
1280 | ||
1281 | /* Reads the server configuration file. */ | |
1282 | ||
1283 | void | |
1284 | load_server_config(const char *filename, Buffer *conf) | |
1285 | { | |
1286 | char line[1024], *cp; | |
1287 | FILE *f; | |
1288 | ||
1289 | debug2("%s: filename %s", __func__, filename); | |
1290 | if ((f = fopen(filename, "r")) == NULL) { | |
1291 | perror(filename); | |
1292 | exit(1); | |
1293 | } | |
1294 | buffer_clear(conf); | |
1295 | while (fgets(line, sizeof(line), f)) { | |
1296 | /* | |
1297 | * Trim out comments and strip whitespace | |
1298 | * NB - preserve newlines, they are needed to reproduce | |
1299 | * line numbers later for error messages | |
1300 | */ | |
1301 | if ((cp = strchr(line, '#')) != NULL) | |
1302 | memcpy(cp, "\n", 2); | |
1303 | cp = line + strspn(line, " \t\r"); | |
1304 | ||
1305 | buffer_append(conf, cp, strlen(cp)); | |
1306 | } | |
1307 | buffer_append(conf, "\0", 1); | |
1308 | fclose(f); | |
1309 | debug2("%s: done config len = %d", __func__, buffer_len(conf)); | |
1310 | } | |
1311 | ||
1312 | void | |
1313 | parse_server_match_config(ServerOptions *options, const char *user, | |
1314 | const char *host, const char *address) | |
1315 | { | |
1316 | ServerOptions mo; | |
1317 | ||
1318 | initialize_server_options(&mo); | |
1319 | parse_server_config(&mo, "reprocess config", &cfg, user, host, address); | |
1320 | copy_set_server_options(options, &mo); | |
1321 | } | |
1322 | ||
1323 | /* Copy any (supported) values that are set */ | |
1324 | void | |
1325 | copy_set_server_options(ServerOptions *dst, ServerOptions *src) | |
1326 | { | |
1327 | if (src->allow_tcp_forwarding != -1) | |
1328 | dst->allow_tcp_forwarding = src->allow_tcp_forwarding; | |
1329 | if (src->gateway_ports != -1) | |
1330 | dst->gateway_ports = src->gateway_ports; | |
1331 | if (src->adm_forced_command != NULL) { | |
1332 | if (dst->adm_forced_command != NULL) | |
1333 | xfree(dst->adm_forced_command); | |
1334 | dst->adm_forced_command = src->adm_forced_command; | |
1335 | } | |
1336 | if (src->x11_display_offset != -1) | |
1337 | dst->x11_display_offset = src->x11_display_offset; | |
1338 | if (src->x11_forwarding != -1) | |
1339 | dst->x11_forwarding = src->x11_forwarding; | |
1340 | if (src->x11_use_localhost != -1) | |
1341 | dst->x11_use_localhost = src->x11_use_localhost; | |
1342 | } | |
1343 | ||
1344 | void | |
1345 | parse_server_config(ServerOptions *options, const char *filename, Buffer *conf, | |
1346 | const char *user, const char *host, const char *address) | |
1347 | { | |
1348 | int active, linenum, bad_options = 0; | |
1349 | char *cp, *obuf, *cbuf; | |
1350 | ||
1351 | debug2("%s: config %s len %d", __func__, filename, buffer_len(conf)); | |
1352 | ||
1353 | obuf = cbuf = xstrdup(buffer_ptr(conf)); | |
1354 | active = user ? 0 : 1; | |
1355 | linenum = 1; | |
1356 | while ((cp = strsep(&cbuf, "\n")) != NULL) { | |
1357 | if (process_server_config_line(options, cp, filename, | |
1358 | linenum++, &active, user, host, address) != 0) | |
1359 | bad_options++; | |
1360 | } | |
1361 | xfree(obuf); | |
1362 | if (bad_options > 0) | |
1363 | fatal("%s: terminating, %d bad configuration options", | |
1364 | filename, bad_options); | |
1365 | } |