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1 | /* $OpenBSD: servconf.c,v 1.172 2007/04/23 10:15:39 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 | #ifdef SESSION_HOOKS | |
92 | options->session_hooks_allow = -1; | |
93 | options->session_hooks_startup_cmd = NULL; | |
94 | options->session_hooks_shutdown_cmd = NULL; | |
95 | #endif | |
96 | options->kerberos_get_afs_token = -1; | |
97 | options->gss_authentication=-1; | |
98 | options->gss_keyex = -1; | |
99 | options->gss_cleanup_creds = -1; | |
100 | options->gss_strict_acceptor = -1; | |
101 | options->gsi_allow_limited_proxy = -1; | |
102 | options->password_authentication = -1; | |
103 | options->kbd_interactive_authentication = -1; | |
104 | options->challenge_response_authentication = -1; | |
105 | options->permit_empty_passwd = -1; | |
106 | options->permit_user_env = -1; | |
107 | options->use_login = -1; | |
108 | options->compression = -1; | |
109 | options->allow_tcp_forwarding = -1; | |
110 | options->num_allow_users = 0; | |
111 | options->num_deny_users = 0; | |
112 | options->num_allow_groups = 0; | |
113 | options->num_deny_groups = 0; | |
114 | options->ciphers = NULL; | |
115 | options->macs = NULL; | |
116 | options->protocol = SSH_PROTO_UNKNOWN; | |
117 | options->gateway_ports = -1; | |
118 | options->num_subsystems = 0; | |
119 | options->max_startups_begin = -1; | |
120 | options->max_startups_rate = -1; | |
121 | options->max_startups = -1; | |
122 | options->max_authtries = -1; | |
123 | options->banner = NULL; | |
124 | options->use_dns = -1; | |
125 | options->client_alive_interval = -1; | |
126 | options->client_alive_count_max = -1; | |
127 | options->authorized_keys_file = NULL; | |
128 | options->authorized_keys_file2 = NULL; | |
129 | options->num_accept_env = 0; | |
130 | options->permit_tun = -1; | |
131 | options->num_permitted_opens = -1; | |
132 | options->adm_forced_command = NULL; | |
133 | options->none_enabled = -1; | |
134 | options->tcp_rcv_buf_poll = -1; | |
135 | options->hpn_disabled = -1; | |
136 | options->hpn_buffer_size = -1; | |
137 | } | |
138 | ||
139 | void | |
140 | fill_default_server_options(ServerOptions *options) | |
141 | { | |
142 | int sock; | |
143 | int socksize; | |
144 | int socksizelen = sizeof(int); | |
145 | ||
146 | /* Portable-specific options */ | |
147 | if (options->use_pam == -1) | |
148 | options->use_pam = 0; | |
149 | ||
150 | /* Standard Options */ | |
151 | if (options->protocol == SSH_PROTO_UNKNOWN) | |
152 | options->protocol = SSH_PROTO_1|SSH_PROTO_2; | |
153 | if (options->num_host_key_files == 0) { | |
154 | /* fill default hostkeys for protocols */ | |
155 | if (options->protocol & SSH_PROTO_1) | |
156 | options->host_key_files[options->num_host_key_files++] = | |
157 | _PATH_HOST_KEY_FILE; | |
158 | if (options->protocol & SSH_PROTO_2) { | |
159 | options->host_key_files[options->num_host_key_files++] = | |
160 | _PATH_HOST_RSA_KEY_FILE; | |
161 | options->host_key_files[options->num_host_key_files++] = | |
162 | _PATH_HOST_DSA_KEY_FILE; | |
163 | } | |
164 | } | |
165 | if (options->num_ports == 0) | |
166 | options->ports[options->num_ports++] = SSH_DEFAULT_PORT; | |
167 | if (options->listen_addrs == NULL) | |
168 | add_listen_addr(options, NULL, 0); | |
169 | if (options->pid_file == NULL) | |
170 | options->pid_file = _PATH_SSH_DAEMON_PID_FILE; | |
171 | if (options->server_key_bits == -1) | |
172 | options->server_key_bits = 768; | |
173 | if (options->login_grace_time == -1) | |
174 | options->login_grace_time = 120; | |
175 | if (options->key_regeneration_time == -1) | |
176 | options->key_regeneration_time = 3600; | |
177 | if (options->permit_root_login == PERMIT_NOT_SET) | |
178 | options->permit_root_login = PERMIT_YES; | |
179 | if (options->ignore_rhosts == -1) | |
180 | options->ignore_rhosts = 1; | |
181 | if (options->ignore_user_known_hosts == -1) | |
182 | options->ignore_user_known_hosts = 0; | |
183 | if (options->print_motd == -1) | |
184 | options->print_motd = 1; | |
185 | if (options->print_lastlog == -1) | |
186 | options->print_lastlog = 1; | |
187 | if (options->x11_forwarding == -1) | |
188 | options->x11_forwarding = 0; | |
189 | if (options->x11_display_offset == -1) | |
190 | options->x11_display_offset = 10; | |
191 | if (options->x11_use_localhost == -1) | |
192 | options->x11_use_localhost = 1; | |
193 | if (options->xauth_location == NULL) | |
194 | options->xauth_location = _PATH_XAUTH; | |
195 | if (options->strict_modes == -1) | |
196 | options->strict_modes = 1; | |
197 | if (options->tcp_keep_alive == -1) | |
198 | options->tcp_keep_alive = 1; | |
199 | if (options->log_facility == SYSLOG_FACILITY_NOT_SET) | |
200 | options->log_facility = SYSLOG_FACILITY_AUTH; | |
201 | if (options->log_level == SYSLOG_LEVEL_NOT_SET) | |
202 | options->log_level = SYSLOG_LEVEL_INFO; | |
203 | if (options->rhosts_rsa_authentication == -1) | |
204 | options->rhosts_rsa_authentication = 0; | |
205 | if (options->hostbased_authentication == -1) | |
206 | options->hostbased_authentication = 0; | |
207 | if (options->hostbased_uses_name_from_packet_only == -1) | |
208 | options->hostbased_uses_name_from_packet_only = 0; | |
209 | if (options->rsa_authentication == -1) | |
210 | options->rsa_authentication = 1; | |
211 | if (options->pubkey_authentication == -1) | |
212 | options->pubkey_authentication = 1; | |
213 | if (options->kerberos_authentication == -1) | |
214 | options->kerberos_authentication = 0; | |
215 | if (options->kerberos_or_local_passwd == -1) | |
216 | options->kerberos_or_local_passwd = 1; | |
217 | if (options->kerberos_ticket_cleanup == -1) | |
218 | options->kerberos_ticket_cleanup = 1; | |
219 | if (options->kerberos_get_afs_token == -1) | |
220 | options->kerberos_get_afs_token = 0; | |
221 | if (options->gss_authentication == -1) | |
222 | options->gss_authentication = 1; | |
223 | if (options->gss_keyex == -1) | |
224 | options->gss_keyex = 1; | |
225 | if (options->gss_cleanup_creds == -1) | |
226 | options->gss_cleanup_creds = 1; | |
227 | if (options->gss_strict_acceptor == -1) | |
228 | options->gss_strict_acceptor = 1; | |
229 | if (options->gsi_allow_limited_proxy == -1) | |
230 | options->gsi_allow_limited_proxy = 0; | |
231 | if (options->password_authentication == -1) | |
232 | options->password_authentication = 1; | |
233 | if (options->kbd_interactive_authentication == -1) | |
234 | options->kbd_interactive_authentication = 0; | |
235 | if (options->challenge_response_authentication == -1) | |
236 | options->challenge_response_authentication = 1; | |
237 | if (options->permit_empty_passwd == -1) | |
238 | options->permit_empty_passwd = 0; | |
239 | if (options->permit_user_env == -1) | |
240 | options->permit_user_env = 0; | |
241 | if (options->use_login == -1) | |
242 | options->use_login = 0; | |
243 | if (options->compression == -1) | |
244 | options->compression = COMP_DELAYED; | |
245 | if (options->allow_tcp_forwarding == -1) | |
246 | options->allow_tcp_forwarding = 1; | |
247 | if (options->gateway_ports == -1) | |
248 | options->gateway_ports = 0; | |
249 | if (options->max_startups == -1) | |
250 | options->max_startups = 10; | |
251 | if (options->max_startups_rate == -1) | |
252 | options->max_startups_rate = 100; /* 100% */ | |
253 | if (options->max_startups_begin == -1) | |
254 | options->max_startups_begin = options->max_startups; | |
255 | if (options->max_authtries == -1) | |
256 | options->max_authtries = DEFAULT_AUTH_FAIL_MAX; | |
257 | if (options->use_dns == -1) | |
258 | options->use_dns = 1; | |
259 | if (options->client_alive_interval == -1) | |
260 | options->client_alive_interval = 0; | |
261 | if (options->client_alive_count_max == -1) | |
262 | options->client_alive_count_max = 3; | |
263 | if (options->authorized_keys_file2 == NULL) { | |
264 | /* authorized_keys_file2 falls back to authorized_keys_file */ | |
265 | if (options->authorized_keys_file != NULL) | |
266 | options->authorized_keys_file2 = options->authorized_keys_file; | |
267 | else | |
268 | options->authorized_keys_file2 = _PATH_SSH_USER_PERMITTED_KEYS2; | |
269 | } | |
270 | if (options->authorized_keys_file == NULL) | |
271 | options->authorized_keys_file = _PATH_SSH_USER_PERMITTED_KEYS; | |
272 | if (options->permit_tun == -1) | |
273 | options->permit_tun = SSH_TUNMODE_NO; | |
274 | ||
275 | if (options->hpn_disabled == -1) | |
276 | options->hpn_disabled = 0; | |
277 | ||
278 | if (options->hpn_buffer_size == -1) { | |
279 | /* option not explicitly set. Now we have to figure out */ | |
280 | /* what value to use */ | |
281 | if (options->hpn_disabled == 1) { | |
282 | options->hpn_buffer_size = CHAN_SES_WINDOW_DEFAULT; | |
283 | } else { | |
284 | /* get the current RCV size and set it to that */ | |
285 | /*create a socket but don't connect it */ | |
286 | /* we use that the get the rcv socket size */ | |
287 | sock = socket(AF_INET, SOCK_STREAM, 0); | |
288 | getsockopt(sock, SOL_SOCKET, SO_RCVBUF, | |
289 | &socksize, &socksizelen); | |
290 | close(sock); | |
291 | options->hpn_buffer_size = socksize; | |
292 | debug ("HPN Buffer Size: %d", options->hpn_buffer_size); | |
293 | ||
294 | } | |
295 | } else { | |
296 | /* we have to do this incase the user sets both values in a contradictory */ | |
297 | /* manner. hpn_disabled overrrides hpn_buffer_size*/ | |
298 | if (options->hpn_disabled <= 0) { | |
299 | if (options->hpn_buffer_size == 0) | |
300 | options->hpn_buffer_size = 1; | |
301 | /* limit the maximum buffer to 64MB */ | |
302 | if (options->hpn_buffer_size > 64*1024) { | |
303 | options->hpn_buffer_size = 64*1024*1024; | |
304 | } else { | |
305 | options->hpn_buffer_size *= 1024; | |
306 | } | |
307 | } else | |
308 | options->hpn_buffer_size = CHAN_TCP_WINDOW_DEFAULT; | |
309 | } | |
310 | ||
311 | /* Turn privilege separation on by default */ | |
312 | if (use_privsep == -1) | |
313 | use_privsep = 1; | |
314 | ||
315 | #ifndef HAVE_MMAP | |
316 | if (use_privsep && options->compression == 1) { | |
317 | error("This platform does not support both privilege " | |
318 | "separation and compression"); | |
319 | error("Compression disabled"); | |
320 | options->compression = 0; | |
321 | } | |
322 | #endif | |
323 | ||
324 | } | |
325 | ||
326 | /* Keyword tokens. */ | |
327 | typedef enum { | |
328 | sBadOption, /* == unknown option */ | |
329 | /* Portable-specific options */ | |
330 | sUsePAM, | |
331 | /* Standard Options */ | |
332 | sPort, sHostKeyFile, sServerKeyBits, sLoginGraceTime, sKeyRegenerationTime, | |
333 | sPermitRootLogin, sLogFacility, sLogLevel, | |
334 | sRhostsRSAAuthentication, sRSAAuthentication, | |
335 | sKerberosAuthentication, sKerberosOrLocalPasswd, sKerberosTicketCleanup, | |
336 | sKerberosGetAFSToken, | |
337 | sKerberosTgtPassing, sChallengeResponseAuthentication, | |
338 | #ifdef SESSION_HOOKS | |
339 | sAllowSessionHooks, sSessionHookStartupCmd, sSessionHookShutdownCmd, | |
340 | #endif | |
341 | sPasswordAuthentication, sKbdInteractiveAuthentication, | |
342 | sListenAddress, sAddressFamily, | |
343 | sPrintMotd, sPrintLastLog, sIgnoreRhosts, | |
344 | sX11Forwarding, sX11DisplayOffset, sX11UseLocalhost, | |
345 | sStrictModes, sEmptyPasswd, sTCPKeepAlive, | |
346 | sPermitUserEnvironment, sUseLogin, sAllowTcpForwarding, sCompression, | |
347 | sAllowUsers, sDenyUsers, sAllowGroups, sDenyGroups, | |
348 | sIgnoreUserKnownHosts, sCiphers, sMacs, sProtocol, sPidFile, | |
349 | sGatewayPorts, sPubkeyAuthentication, sXAuthLocation, sSubsystem, | |
350 | sMaxStartups, sMaxAuthTries, | |
351 | sBanner, sUseDNS, sHostbasedAuthentication, | |
352 | sHostbasedUsesNameFromPacketOnly, sClientAliveInterval, | |
353 | sClientAliveCountMax, sAuthorizedKeysFile, sAuthorizedKeysFile2, | |
354 | sGssAuthentication, sGssCleanupCreds, sGssStrictAcceptor, | |
355 | sGssKeyEx, | |
356 | sGssCredsPath, | |
357 | sGsiAllowLimitedProxy, | |
358 | sAcceptEnv, sPermitTunnel, | |
359 | sMatch, sPermitOpen, sForceCommand, | |
360 | sUsePrivilegeSeparation, sNoneEnabled, sTcpRcvBufPoll, | |
361 | sHPNDisabled, sHPNBufferSize, | |
362 | sDeprecated, sUnsupported | |
363 | } ServerOpCodes; | |
364 | ||
365 | #define SSHCFG_GLOBAL 0x01 /* allowed in main section of sshd_config */ | |
366 | #define SSHCFG_MATCH 0x02 /* allowed inside a Match section */ | |
367 | #define SSHCFG_ALL (SSHCFG_GLOBAL|SSHCFG_MATCH) | |
368 | ||
369 | /* Textual representation of the tokens. */ | |
370 | static struct { | |
371 | const char *name; | |
372 | ServerOpCodes opcode; | |
373 | u_int flags; | |
374 | } keywords[] = { | |
375 | /* Portable-specific options */ | |
376 | #ifdef USE_PAM | |
377 | { "usepam", sUsePAM, SSHCFG_GLOBAL }, | |
378 | #else | |
379 | { "usepam", sUnsupported, SSHCFG_GLOBAL }, | |
380 | #endif | |
381 | { "pamauthenticationviakbdint", sDeprecated, SSHCFG_GLOBAL }, | |
382 | /* Standard Options */ | |
383 | { "port", sPort, SSHCFG_GLOBAL }, | |
384 | { "hostkey", sHostKeyFile, SSHCFG_GLOBAL }, | |
385 | { "hostdsakey", sHostKeyFile, SSHCFG_GLOBAL }, /* alias */ | |
386 | { "pidfile", sPidFile, SSHCFG_GLOBAL }, | |
387 | { "serverkeybits", sServerKeyBits, SSHCFG_GLOBAL }, | |
388 | { "logingracetime", sLoginGraceTime, SSHCFG_GLOBAL }, | |
389 | { "keyregenerationinterval", sKeyRegenerationTime, SSHCFG_GLOBAL }, | |
390 | { "permitrootlogin", sPermitRootLogin, SSHCFG_GLOBAL }, | |
391 | { "syslogfacility", sLogFacility, SSHCFG_GLOBAL }, | |
392 | { "loglevel", sLogLevel, SSHCFG_GLOBAL }, | |
393 | { "rhostsauthentication", sDeprecated, SSHCFG_GLOBAL }, | |
394 | { "rhostsrsaauthentication", sRhostsRSAAuthentication, SSHCFG_ALL }, | |
395 | { "hostbasedauthentication", sHostbasedAuthentication, SSHCFG_ALL }, | |
396 | { "hostbasedusesnamefrompacketonly", sHostbasedUsesNameFromPacketOnly, SSHCFG_GLOBAL }, | |
397 | { "rsaauthentication", sRSAAuthentication, SSHCFG_ALL }, | |
398 | { "pubkeyauthentication", sPubkeyAuthentication, SSHCFG_ALL }, | |
399 | { "dsaauthentication", sPubkeyAuthentication, SSHCFG_GLOBAL }, /* alias */ | |
400 | #ifdef KRB5 | |
401 | { "kerberosauthentication", sKerberosAuthentication, SSHCFG_ALL }, | |
402 | { "kerberosorlocalpasswd", sKerberosOrLocalPasswd, SSHCFG_GLOBAL }, | |
403 | { "kerberosticketcleanup", sKerberosTicketCleanup, SSHCFG_GLOBAL }, | |
404 | #ifdef USE_AFS | |
405 | { "kerberosgetafstoken", sKerberosGetAFSToken, SSHCFG_GLOBAL }, | |
406 | #else | |
407 | { "kerberosgetafstoken", sUnsupported, SSHCFG_GLOBAL }, | |
408 | #endif | |
409 | #else | |
410 | { "kerberosauthentication", sUnsupported, SSHCFG_ALL }, | |
411 | { "kerberosorlocalpasswd", sUnsupported, SSHCFG_GLOBAL }, | |
412 | { "kerberosticketcleanup", sUnsupported, SSHCFG_GLOBAL }, | |
413 | { "kerberosgetafstoken", sUnsupported, SSHCFG_GLOBAL }, | |
414 | #endif | |
415 | { "kerberostgtpassing", sUnsupported, SSHCFG_GLOBAL }, | |
416 | { "afstokenpassing", sUnsupported, SSHCFG_GLOBAL }, | |
417 | #ifdef GSSAPI | |
418 | { "gssapiauthentication", sGssAuthentication, SSHCFG_ALL }, | |
419 | { "gssapicleanupcredentials", sGssCleanupCreds, SSHCFG_GLOBAL }, | |
420 | { "gssapistrictacceptorcheck", sGssStrictAcceptor, SSHCFG_GLOBAL }, | |
421 | { "gssapicredentialspath", sGssCredsPath, SSHCFG_GLOBAL }, | |
422 | { "gssapikeyexchange", sGssKeyEx, SSHCFG_GLOBAL }, | |
423 | #ifdef GSI | |
424 | { "gsiallowlimitedproxy", sGsiAllowLimitedProxy, SSHCFG_GLOBAL }, | |
425 | #endif | |
426 | #else | |
427 | { "gssapiauthentication", sUnsupported, SSHCFG_ALL }, | |
428 | { "gssapicleanupcredentials", sUnsupported, SSHCFG_GLOBAL }, | |
429 | { "gssapistrictacceptorcheck", sUnsupported, SSHCFG_GLOBAL }, | |
430 | { "gssapicredentialspath", sUnsupported, SSHCFG_GLOBAL }, | |
431 | { "gssapikeyexchange", sUnsupported, SSHCFG_GLOBAL }, | |
432 | #ifdef GSI | |
433 | { "gsiallowlimitedproxy", sUnsupported, SSHCFG_GLOBAL }, | |
434 | #endif | |
435 | #endif | |
436 | #ifdef SESSION_HOOKS | |
437 | { "allowsessionhooks", sAllowSessionHooks, SSHCFG_GLOBAL }, | |
438 | { "sessionhookstartupcmd", sSessionHookStartupCmd, SSHCFG_GLOBAL }, | |
439 | { "sessionhookshutdowncmd", sSessionHookShutdownCmd, SSHCFG_GLOBAL }, | |
440 | #endif | |
441 | { "passwordauthentication", sPasswordAuthentication, SSHCFG_ALL }, | |
442 | { "kbdinteractiveauthentication", sKbdInteractiveAuthentication, SSHCFG_ALL }, | |
443 | { "challengeresponseauthentication", sChallengeResponseAuthentication, SSHCFG_GLOBAL }, | |
444 | { "skeyauthentication", sChallengeResponseAuthentication, SSHCFG_GLOBAL }, /* alias */ | |
445 | { "checkmail", sDeprecated, SSHCFG_GLOBAL }, | |
446 | { "listenaddress", sListenAddress, SSHCFG_GLOBAL }, | |
447 | { "addressfamily", sAddressFamily, SSHCFG_GLOBAL }, | |
448 | { "printmotd", sPrintMotd, SSHCFG_GLOBAL }, | |
449 | { "printlastlog", sPrintLastLog, SSHCFG_GLOBAL }, | |
450 | { "ignorerhosts", sIgnoreRhosts, SSHCFG_GLOBAL }, | |
451 | { "ignoreuserknownhosts", sIgnoreUserKnownHosts, SSHCFG_GLOBAL }, | |
452 | { "x11forwarding", sX11Forwarding, SSHCFG_ALL }, | |
453 | { "x11displayoffset", sX11DisplayOffset, SSHCFG_ALL }, | |
454 | { "x11uselocalhost", sX11UseLocalhost, SSHCFG_ALL }, | |
455 | { "xauthlocation", sXAuthLocation, SSHCFG_GLOBAL }, | |
456 | { "strictmodes", sStrictModes, SSHCFG_GLOBAL }, | |
457 | { "permitemptypasswords", sEmptyPasswd, SSHCFG_GLOBAL }, | |
458 | { "permituserenvironment", sPermitUserEnvironment, SSHCFG_GLOBAL }, | |
459 | { "uselogin", sUseLogin, SSHCFG_GLOBAL }, | |
460 | { "compression", sCompression, SSHCFG_GLOBAL }, | |
461 | { "tcpkeepalive", sTCPKeepAlive, SSHCFG_GLOBAL }, | |
462 | { "keepalive", sTCPKeepAlive, SSHCFG_GLOBAL }, /* obsolete alias */ | |
463 | { "allowtcpforwarding", sAllowTcpForwarding, SSHCFG_ALL }, | |
464 | { "allowusers", sAllowUsers, SSHCFG_GLOBAL }, | |
465 | { "denyusers", sDenyUsers, SSHCFG_GLOBAL }, | |
466 | { "allowgroups", sAllowGroups, SSHCFG_GLOBAL }, | |
467 | { "denygroups", sDenyGroups, SSHCFG_GLOBAL }, | |
468 | { "ciphers", sCiphers, SSHCFG_GLOBAL }, | |
469 | { "macs", sMacs, SSHCFG_GLOBAL }, | |
470 | { "protocol", sProtocol, SSHCFG_GLOBAL }, | |
471 | { "gatewayports", sGatewayPorts, SSHCFG_ALL }, | |
472 | { "subsystem", sSubsystem, SSHCFG_GLOBAL }, | |
473 | { "maxstartups", sMaxStartups, SSHCFG_GLOBAL }, | |
474 | { "maxauthtries", sMaxAuthTries, SSHCFG_GLOBAL }, | |
475 | { "banner", sBanner, SSHCFG_ALL }, | |
476 | { "usedns", sUseDNS, SSHCFG_GLOBAL }, | |
477 | { "verifyreversemapping", sDeprecated, SSHCFG_GLOBAL }, | |
478 | { "reversemappingcheck", sDeprecated, SSHCFG_GLOBAL }, | |
479 | { "clientaliveinterval", sClientAliveInterval, SSHCFG_GLOBAL }, | |
480 | { "clientalivecountmax", sClientAliveCountMax, SSHCFG_GLOBAL }, | |
481 | { "authorizedkeysfile", sAuthorizedKeysFile, SSHCFG_GLOBAL }, | |
482 | { "authorizedkeysfile2", sAuthorizedKeysFile2, SSHCFG_GLOBAL }, | |
483 | { "useprivilegeseparation", sUsePrivilegeSeparation, SSHCFG_GLOBAL }, | |
484 | { "acceptenv", sAcceptEnv, SSHCFG_GLOBAL }, | |
485 | { "permittunnel", sPermitTunnel, SSHCFG_GLOBAL }, | |
486 | { "match", sMatch, SSHCFG_ALL }, | |
487 | { "permitopen", sPermitOpen, SSHCFG_ALL }, | |
488 | { "forcecommand", sForceCommand, SSHCFG_ALL }, | |
489 | { "noneenabled", sNoneEnabled }, | |
490 | { "hpndisabled", sHPNDisabled }, | |
491 | { "hpnbuffersize", sHPNBufferSize }, | |
492 | { "tcprcvbufpoll", sTcpRcvBufPoll }, | |
493 | { NULL, sBadOption, 0 } | |
494 | }; | |
495 | ||
496 | /* | |
497 | * Returns the number of the token pointed to by cp or sBadOption. | |
498 | */ | |
499 | ||
500 | static ServerOpCodes | |
501 | parse_token(const char *cp, const char *filename, | |
502 | int linenum, u_int *flags) | |
503 | { | |
504 | u_int i; | |
505 | ||
506 | for (i = 0; keywords[i].name; i++) | |
507 | if (strcasecmp(cp, keywords[i].name) == 0) { | |
508 | debug ("Config token is %s", keywords[i].name); | |
509 | *flags = keywords[i].flags; | |
510 | return keywords[i].opcode; | |
511 | } | |
512 | ||
513 | error("%s: line %d: Bad configuration option: %s", | |
514 | filename, linenum, cp); | |
515 | return sBadOption; | |
516 | } | |
517 | ||
518 | static void | |
519 | add_listen_addr(ServerOptions *options, char *addr, u_short port) | |
520 | { | |
521 | u_int i; | |
522 | ||
523 | if (options->num_ports == 0) | |
524 | options->ports[options->num_ports++] = SSH_DEFAULT_PORT; | |
525 | if (options->address_family == -1) | |
526 | options->address_family = AF_UNSPEC; | |
527 | if (port == 0) | |
528 | for (i = 0; i < options->num_ports; i++) | |
529 | add_one_listen_addr(options, addr, options->ports[i]); | |
530 | else | |
531 | add_one_listen_addr(options, addr, port); | |
532 | } | |
533 | ||
534 | static void | |
535 | add_one_listen_addr(ServerOptions *options, char *addr, u_short port) | |
536 | { | |
537 | struct addrinfo hints, *ai, *aitop; | |
538 | char strport[NI_MAXSERV]; | |
539 | int gaierr; | |
540 | ||
541 | memset(&hints, 0, sizeof(hints)); | |
542 | hints.ai_family = options->address_family; | |
543 | hints.ai_socktype = SOCK_STREAM; | |
544 | hints.ai_flags = (addr == NULL) ? AI_PASSIVE : 0; | |
545 | snprintf(strport, sizeof strport, "%u", port); | |
546 | if ((gaierr = getaddrinfo(addr, strport, &hints, &aitop)) != 0) | |
547 | fatal("bad addr or host: %s (%s)", | |
548 | addr ? addr : "<NULL>", | |
549 | gai_strerror(gaierr)); | |
550 | for (ai = aitop; ai->ai_next; ai = ai->ai_next) | |
551 | ; | |
552 | ai->ai_next = options->listen_addrs; | |
553 | options->listen_addrs = aitop; | |
554 | } | |
555 | ||
556 | /* | |
557 | * The strategy for the Match blocks is that the config file is parsed twice. | |
558 | * | |
559 | * The first time is at startup. activep is initialized to 1 and the | |
560 | * directives in the global context are processed and acted on. Hitting a | |
561 | * Match directive unsets activep and the directives inside the block are | |
562 | * checked for syntax only. | |
563 | * | |
564 | * The second time is after a connection has been established but before | |
565 | * authentication. activep is initialized to 2 and global config directives | |
566 | * are ignored since they have already been processed. If the criteria in a | |
567 | * Match block is met, activep is set and the subsequent directives | |
568 | * processed and actioned until EOF or another Match block unsets it. Any | |
569 | * options set are copied into the main server config. | |
570 | * | |
571 | * Potential additions/improvements: | |
572 | * - Add Match support for pre-kex directives, eg Protocol, Ciphers. | |
573 | * | |
574 | * - Add a Tag directive (idea from David Leonard) ala pf, eg: | |
575 | * Match Address 192.168.0.* | |
576 | * Tag trusted | |
577 | * Match Group wheel | |
578 | * Tag trusted | |
579 | * Match Tag trusted | |
580 | * AllowTcpForwarding yes | |
581 | * GatewayPorts clientspecified | |
582 | * [...] | |
583 | * | |
584 | * - Add a PermittedChannelRequests directive | |
585 | * Match Group shell | |
586 | * PermittedChannelRequests session,forwarded-tcpip | |
587 | */ | |
588 | ||
589 | static int | |
590 | match_cfg_line_group(const char *grps, int line, const char *user) | |
591 | { | |
592 | int result = 0; | |
593 | u_int ngrps = 0; | |
594 | char *arg, *p, *cp, *grplist[MAX_MATCH_GROUPS]; | |
595 | struct passwd *pw; | |
596 | ||
597 | /* | |
598 | * Even if we do not have a user yet, we still need to check for | |
599 | * valid syntax. | |
600 | */ | |
601 | arg = cp = xstrdup(grps); | |
602 | while ((p = strsep(&cp, ",")) != NULL && *p != '\0') { | |
603 | if (ngrps >= MAX_MATCH_GROUPS) { | |
604 | error("line %d: too many groups in Match Group", line); | |
605 | result = -1; | |
606 | goto out; | |
607 | } | |
608 | grplist[ngrps++] = p; | |
609 | } | |
610 | ||
611 | if (user == NULL) | |
612 | goto out; | |
613 | ||
614 | if ((pw = getpwnam(user)) == NULL) { | |
615 | debug("Can't match group at line %d because user %.100s does " | |
616 | "not exist", line, user); | |
617 | } else if (ga_init(pw->pw_name, pw->pw_gid) == 0) { | |
618 | debug("Can't Match group because user %.100s not in any group " | |
619 | "at line %d", user, line); | |
620 | } else if (ga_match(grplist, ngrps) != 1) { | |
621 | debug("user %.100s does not match group %.100s at line %d", | |
622 | user, arg, line); | |
623 | } else { | |
624 | debug("user %.100s matched group %.100s at line %d", user, | |
625 | arg, line); | |
626 | result = 1; | |
627 | } | |
628 | out: | |
629 | ga_free(); | |
630 | xfree(arg); | |
631 | return result; | |
632 | } | |
633 | ||
634 | static int | |
635 | match_cfg_line(char **condition, int line, const char *user, const char *host, | |
636 | const char *address) | |
637 | { | |
638 | int result = 1; | |
639 | char *arg, *attrib, *cp = *condition; | |
640 | size_t len; | |
641 | ||
642 | if (user == NULL) | |
643 | debug3("checking syntax for 'Match %s'", cp); | |
644 | else | |
645 | debug3("checking match for '%s' user %s host %s addr %s", cp, | |
646 | user ? user : "(null)", host ? host : "(null)", | |
647 | address ? address : "(null)"); | |
648 | ||
649 | while ((attrib = strdelim(&cp)) && *attrib != '\0') { | |
650 | if ((arg = strdelim(&cp)) == NULL || *arg == '\0') { | |
651 | error("Missing Match criteria for %s", attrib); | |
652 | return -1; | |
653 | } | |
654 | len = strlen(arg); | |
655 | if (strcasecmp(attrib, "user") == 0) { | |
656 | if (!user) { | |
657 | result = 0; | |
658 | continue; | |
659 | } | |
660 | if (match_pattern_list(user, arg, len, 0) != 1) | |
661 | result = 0; | |
662 | else | |
663 | debug("user %.100s matched 'User %.100s' at " | |
664 | "line %d", user, arg, line); | |
665 | } else if (strcasecmp(attrib, "group") == 0) { | |
666 | switch (match_cfg_line_group(arg, line, user)) { | |
667 | case -1: | |
668 | return -1; | |
669 | case 0: | |
670 | result = 0; | |
671 | } | |
672 | } else if (strcasecmp(attrib, "host") == 0) { | |
673 | if (!host) { | |
674 | result = 0; | |
675 | continue; | |
676 | } | |
677 | if (match_hostname(host, arg, len) != 1) | |
678 | result = 0; | |
679 | else | |
680 | debug("connection from %.100s matched 'Host " | |
681 | "%.100s' at line %d", host, arg, line); | |
682 | } else if (strcasecmp(attrib, "address") == 0) { | |
683 | if (!address) { | |
684 | result = 0; | |
685 | continue; | |
686 | } | |
687 | if (match_hostname(address, arg, len) != 1) | |
688 | result = 0; | |
689 | else | |
690 | debug("connection from %.100s matched 'Address " | |
691 | "%.100s' at line %d", address, arg, line); | |
692 | } else { | |
693 | error("Unsupported Match attribute %s", attrib); | |
694 | return -1; | |
695 | } | |
696 | } | |
697 | if (user != NULL) | |
698 | debug3("match %sfound", result ? "" : "not "); | |
699 | *condition = cp; | |
700 | return result; | |
701 | } | |
702 | ||
703 | #define WHITESPACE " \t\r\n" | |
704 | ||
705 | int | |
706 | process_server_config_line(ServerOptions *options, char *line, | |
707 | const char *filename, int linenum, int *activep, const char *user, | |
708 | const char *host, const char *address) | |
709 | { | |
710 | char *cp, **charptr, *arg, *p; | |
711 | int cmdline = 0, *intptr, value, n; | |
712 | ServerOpCodes opcode; | |
713 | u_short port; | |
714 | u_int i, flags = 0; | |
715 | size_t len; | |
716 | ||
717 | cp = line; | |
718 | if ((arg = strdelim(&cp)) == NULL) | |
719 | return 0; | |
720 | /* Ignore leading whitespace */ | |
721 | if (*arg == '\0') | |
722 | arg = strdelim(&cp); | |
723 | if (!arg || !*arg || *arg == '#') | |
724 | return 0; | |
725 | intptr = NULL; | |
726 | charptr = NULL; | |
727 | opcode = parse_token(arg, filename, linenum, &flags); | |
728 | ||
729 | if (activep == NULL) { /* We are processing a command line directive */ | |
730 | cmdline = 1; | |
731 | activep = &cmdline; | |
732 | } | |
733 | if (*activep && opcode != sMatch) | |
734 | debug3("%s:%d setting %s %s", filename, linenum, arg, cp); | |
735 | if (*activep == 0 && !(flags & SSHCFG_MATCH)) { | |
736 | if (user == NULL) { | |
737 | fatal("%s line %d: Directive '%s' is not allowed " | |
738 | "within a Match block", filename, linenum, arg); | |
739 | } else { /* this is a directive we have already processed */ | |
740 | while (arg) | |
741 | arg = strdelim(&cp); | |
742 | return 0; | |
743 | } | |
744 | } | |
745 | ||
746 | switch (opcode) { | |
747 | /* Portable-specific options */ | |
748 | case sUsePAM: | |
749 | intptr = &options->use_pam; | |
750 | goto parse_flag; | |
751 | ||
752 | /* Standard Options */ | |
753 | case sBadOption: | |
754 | return -1; | |
755 | case sPort: | |
756 | /* ignore ports from configfile if cmdline specifies ports */ | |
757 | if (options->ports_from_cmdline) | |
758 | return 0; | |
759 | if (options->listen_addrs != NULL) | |
760 | fatal("%s line %d: ports must be specified before " | |
761 | "ListenAddress.", filename, linenum); | |
762 | if (options->num_ports >= MAX_PORTS) | |
763 | fatal("%s line %d: too many ports.", | |
764 | filename, linenum); | |
765 | arg = strdelim(&cp); | |
766 | if (!arg || *arg == '\0') | |
767 | fatal("%s line %d: missing port number.", | |
768 | filename, linenum); | |
769 | options->ports[options->num_ports++] = a2port(arg); | |
770 | if (options->ports[options->num_ports-1] == 0) | |
771 | fatal("%s line %d: Badly formatted port number.", | |
772 | filename, linenum); | |
773 | break; | |
774 | ||
775 | case sServerKeyBits: | |
776 | intptr = &options->server_key_bits; | |
777 | parse_int: | |
778 | arg = strdelim(&cp); | |
779 | if (!arg || *arg == '\0') | |
780 | fatal("%s line %d: missing integer value.", | |
781 | filename, linenum); | |
782 | value = atoi(arg); | |
783 | if (*activep && *intptr == -1) | |
784 | *intptr = value; | |
785 | break; | |
786 | ||
787 | case sLoginGraceTime: | |
788 | intptr = &options->login_grace_time; | |
789 | parse_time: | |
790 | arg = strdelim(&cp); | |
791 | if (!arg || *arg == '\0') | |
792 | fatal("%s line %d: missing time value.", | |
793 | filename, linenum); | |
794 | if ((value = convtime(arg)) == -1) | |
795 | fatal("%s line %d: invalid time value.", | |
796 | filename, linenum); | |
797 | if (*intptr == -1) | |
798 | *intptr = value; | |
799 | break; | |
800 | ||
801 | case sKeyRegenerationTime: | |
802 | intptr = &options->key_regeneration_time; | |
803 | goto parse_time; | |
804 | ||
805 | case sListenAddress: | |
806 | arg = strdelim(&cp); | |
807 | if (arg == NULL || *arg == '\0') | |
808 | fatal("%s line %d: missing address", | |
809 | filename, linenum); | |
810 | /* check for bare IPv6 address: no "[]" and 2 or more ":" */ | |
811 | if (strchr(arg, '[') == NULL && (p = strchr(arg, ':')) != NULL | |
812 | && strchr(p+1, ':') != NULL) { | |
813 | add_listen_addr(options, arg, 0); | |
814 | break; | |
815 | } | |
816 | p = hpdelim(&arg); | |
817 | if (p == NULL) | |
818 | fatal("%s line %d: bad address:port usage", | |
819 | filename, linenum); | |
820 | p = cleanhostname(p); | |
821 | if (arg == NULL) | |
822 | port = 0; | |
823 | else if ((port = a2port(arg)) == 0) | |
824 | fatal("%s line %d: bad port number", filename, linenum); | |
825 | ||
826 | add_listen_addr(options, p, port); | |
827 | ||
828 | break; | |
829 | ||
830 | case sAddressFamily: | |
831 | arg = strdelim(&cp); | |
832 | if (!arg || *arg == '\0') | |
833 | fatal("%s line %d: missing address family.", | |
834 | filename, linenum); | |
835 | intptr = &options->address_family; | |
836 | if (options->listen_addrs != NULL) | |
837 | fatal("%s line %d: address family must be specified before " | |
838 | "ListenAddress.", filename, linenum); | |
839 | if (strcasecmp(arg, "inet") == 0) | |
840 | value = AF_INET; | |
841 | else if (strcasecmp(arg, "inet6") == 0) | |
842 | value = AF_INET6; | |
843 | else if (strcasecmp(arg, "any") == 0) | |
844 | value = AF_UNSPEC; | |
845 | else | |
846 | fatal("%s line %d: unsupported address family \"%s\".", | |
847 | filename, linenum, arg); | |
848 | if (*intptr == -1) | |
849 | *intptr = value; | |
850 | break; | |
851 | ||
852 | case sHostKeyFile: | |
853 | intptr = &options->num_host_key_files; | |
854 | if (*intptr >= MAX_HOSTKEYS) | |
855 | fatal("%s line %d: too many host keys specified (max %d).", | |
856 | filename, linenum, MAX_HOSTKEYS); | |
857 | charptr = &options->host_key_files[*intptr]; | |
858 | parse_filename: | |
859 | arg = strdelim(&cp); | |
860 | if (!arg || *arg == '\0') | |
861 | fatal("%s line %d: missing file name.", | |
862 | filename, linenum); | |
863 | if (*activep && *charptr == NULL) { | |
864 | *charptr = tilde_expand_filename(arg, getuid()); | |
865 | /* increase optional counter */ | |
866 | if (intptr != NULL) | |
867 | *intptr = *intptr + 1; | |
868 | } | |
869 | break; | |
870 | ||
871 | case sPidFile: | |
872 | charptr = &options->pid_file; | |
873 | goto parse_filename; | |
874 | ||
875 | case sPermitRootLogin: | |
876 | intptr = &options->permit_root_login; | |
877 | arg = strdelim(&cp); | |
878 | if (!arg || *arg == '\0') | |
879 | fatal("%s line %d: missing yes/" | |
880 | "without-password/forced-commands-only/no " | |
881 | "argument.", filename, linenum); | |
882 | value = 0; /* silence compiler */ | |
883 | if (strcmp(arg, "without-password") == 0) | |
884 | value = PERMIT_NO_PASSWD; | |
885 | else if (strcmp(arg, "forced-commands-only") == 0) | |
886 | value = PERMIT_FORCED_ONLY; | |
887 | else if (strcmp(arg, "yes") == 0) | |
888 | value = PERMIT_YES; | |
889 | else if (strcmp(arg, "no") == 0) | |
890 | value = PERMIT_NO; | |
891 | else | |
892 | fatal("%s line %d: Bad yes/" | |
893 | "without-password/forced-commands-only/no " | |
894 | "argument: %s", filename, linenum, arg); | |
895 | if (*intptr == -1) | |
896 | *intptr = value; | |
897 | break; | |
898 | ||
899 | case sIgnoreRhosts: | |
900 | intptr = &options->ignore_rhosts; | |
901 | parse_flag: | |
902 | arg = strdelim(&cp); | |
903 | if (!arg || *arg == '\0') | |
904 | fatal("%s line %d: missing yes/no argument.", | |
905 | filename, linenum); | |
906 | value = 0; /* silence compiler */ | |
907 | if (strcmp(arg, "yes") == 0) | |
908 | value = 1; | |
909 | else if (strcmp(arg, "no") == 0) | |
910 | value = 0; | |
911 | else | |
912 | fatal("%s line %d: Bad yes/no argument: %s", | |
913 | filename, linenum, arg); | |
914 | if (*activep && *intptr == -1) | |
915 | *intptr = value; | |
916 | break; | |
917 | ||
918 | case sNoneEnabled: | |
919 | intptr = &options->none_enabled; | |
920 | goto parse_flag; | |
921 | ||
922 | case sTcpRcvBufPoll: | |
923 | intptr = &options->tcp_rcv_buf_poll; | |
924 | goto parse_flag; | |
925 | ||
926 | case sHPNDisabled: | |
927 | intptr = &options->hpn_disabled; | |
928 | goto parse_flag; | |
929 | ||
930 | case sHPNBufferSize: | |
931 | intptr = &options->hpn_buffer_size; | |
932 | goto parse_int; | |
933 | ||
934 | case sIgnoreUserKnownHosts: | |
935 | intptr = &options->ignore_user_known_hosts; | |
936 | goto parse_flag; | |
937 | ||
938 | case sRhostsRSAAuthentication: | |
939 | intptr = &options->rhosts_rsa_authentication; | |
940 | goto parse_flag; | |
941 | ||
942 | case sHostbasedAuthentication: | |
943 | intptr = &options->hostbased_authentication; | |
944 | goto parse_flag; | |
945 | ||
946 | case sHostbasedUsesNameFromPacketOnly: | |
947 | intptr = &options->hostbased_uses_name_from_packet_only; | |
948 | goto parse_flag; | |
949 | ||
950 | case sRSAAuthentication: | |
951 | intptr = &options->rsa_authentication; | |
952 | goto parse_flag; | |
953 | ||
954 | case sPubkeyAuthentication: | |
955 | intptr = &options->pubkey_authentication; | |
956 | goto parse_flag; | |
957 | ||
958 | case sKerberosAuthentication: | |
959 | intptr = &options->kerberos_authentication; | |
960 | goto parse_flag; | |
961 | ||
962 | case sKerberosOrLocalPasswd: | |
963 | intptr = &options->kerberos_or_local_passwd; | |
964 | goto parse_flag; | |
965 | ||
966 | case sKerberosTicketCleanup: | |
967 | intptr = &options->kerberos_ticket_cleanup; | |
968 | goto parse_flag; | |
969 | ||
970 | case sKerberosGetAFSToken: | |
971 | intptr = &options->kerberos_get_afs_token; | |
972 | goto parse_flag; | |
973 | ||
974 | case sGssAuthentication: | |
975 | intptr = &options->gss_authentication; | |
976 | goto parse_flag; | |
977 | ||
978 | case sGssKeyEx: | |
979 | intptr = &options->gss_keyex; | |
980 | goto parse_flag; | |
981 | ||
982 | case sGssCleanupCreds: | |
983 | intptr = &options->gss_cleanup_creds; | |
984 | goto parse_flag; | |
985 | ||
986 | case sGssStrictAcceptor: | |
987 | intptr = &options->gss_strict_acceptor; | |
988 | goto parse_flag; | |
989 | ||
990 | case sGssCredsPath: | |
991 | charptr = &options->gss_creds_path; | |
992 | goto parse_filename; | |
993 | ||
994 | case sGsiAllowLimitedProxy: | |
995 | intptr = &options->gsi_allow_limited_proxy; | |
996 | goto parse_flag; | |
997 | ||
998 | #ifdef SESSION_HOOKS | |
999 | case sAllowSessionHooks: | |
1000 | intptr = &options->session_hooks_allow; | |
1001 | goto parse_flag; | |
1002 | case sSessionHookStartupCmd: | |
1003 | case sSessionHookShutdownCmd: | |
1004 | arg = strdelim(&cp); | |
1005 | if (!arg || *arg == '\0') | |
1006 | fatal("%s line %d: empty session hook command", | |
1007 | filename, linenum); | |
1008 | if (opcode==sSessionHookStartupCmd) | |
1009 | options->session_hooks_startup_cmd = strdup(arg); | |
1010 | else | |
1011 | options->session_hooks_shutdown_cmd = strdup(arg); | |
1012 | break; | |
1013 | #endif | |
1014 | ||
1015 | case sPasswordAuthentication: | |
1016 | intptr = &options->password_authentication; | |
1017 | goto parse_flag; | |
1018 | ||
1019 | case sKbdInteractiveAuthentication: | |
1020 | intptr = &options->kbd_interactive_authentication; | |
1021 | goto parse_flag; | |
1022 | ||
1023 | case sChallengeResponseAuthentication: | |
1024 | intptr = &options->challenge_response_authentication; | |
1025 | goto parse_flag; | |
1026 | ||
1027 | case sPrintMotd: | |
1028 | intptr = &options->print_motd; | |
1029 | goto parse_flag; | |
1030 | ||
1031 | case sPrintLastLog: | |
1032 | intptr = &options->print_lastlog; | |
1033 | goto parse_flag; | |
1034 | ||
1035 | case sX11Forwarding: | |
1036 | intptr = &options->x11_forwarding; | |
1037 | goto parse_flag; | |
1038 | ||
1039 | case sX11DisplayOffset: | |
1040 | intptr = &options->x11_display_offset; | |
1041 | goto parse_int; | |
1042 | ||
1043 | case sX11UseLocalhost: | |
1044 | intptr = &options->x11_use_localhost; | |
1045 | goto parse_flag; | |
1046 | ||
1047 | case sXAuthLocation: | |
1048 | charptr = &options->xauth_location; | |
1049 | goto parse_filename; | |
1050 | ||
1051 | case sStrictModes: | |
1052 | intptr = &options->strict_modes; | |
1053 | goto parse_flag; | |
1054 | ||
1055 | case sTCPKeepAlive: | |
1056 | intptr = &options->tcp_keep_alive; | |
1057 | goto parse_flag; | |
1058 | ||
1059 | case sEmptyPasswd: | |
1060 | intptr = &options->permit_empty_passwd; | |
1061 | goto parse_flag; | |
1062 | ||
1063 | case sPermitUserEnvironment: | |
1064 | intptr = &options->permit_user_env; | |
1065 | goto parse_flag; | |
1066 | ||
1067 | case sUseLogin: | |
1068 | intptr = &options->use_login; | |
1069 | goto parse_flag; | |
1070 | ||
1071 | case sCompression: | |
1072 | intptr = &options->compression; | |
1073 | arg = strdelim(&cp); | |
1074 | if (!arg || *arg == '\0') | |
1075 | fatal("%s line %d: missing yes/no/delayed " | |
1076 | "argument.", filename, linenum); | |
1077 | value = 0; /* silence compiler */ | |
1078 | if (strcmp(arg, "delayed") == 0) | |
1079 | value = COMP_DELAYED; | |
1080 | else if (strcmp(arg, "yes") == 0) | |
1081 | value = COMP_ZLIB; | |
1082 | else if (strcmp(arg, "no") == 0) | |
1083 | value = COMP_NONE; | |
1084 | else | |
1085 | fatal("%s line %d: Bad yes/no/delayed " | |
1086 | "argument: %s", filename, linenum, arg); | |
1087 | if (*intptr == -1) | |
1088 | *intptr = value; | |
1089 | break; | |
1090 | ||
1091 | case sGatewayPorts: | |
1092 | intptr = &options->gateway_ports; | |
1093 | arg = strdelim(&cp); | |
1094 | if (!arg || *arg == '\0') | |
1095 | fatal("%s line %d: missing yes/no/clientspecified " | |
1096 | "argument.", filename, linenum); | |
1097 | value = 0; /* silence compiler */ | |
1098 | if (strcmp(arg, "clientspecified") == 0) | |
1099 | value = 2; | |
1100 | else if (strcmp(arg, "yes") == 0) | |
1101 | value = 1; | |
1102 | else if (strcmp(arg, "no") == 0) | |
1103 | value = 0; | |
1104 | else | |
1105 | fatal("%s line %d: Bad yes/no/clientspecified " | |
1106 | "argument: %s", filename, linenum, arg); | |
1107 | if (*activep && *intptr == -1) | |
1108 | *intptr = value; | |
1109 | break; | |
1110 | ||
1111 | case sUseDNS: | |
1112 | intptr = &options->use_dns; | |
1113 | goto parse_flag; | |
1114 | ||
1115 | case sLogFacility: | |
1116 | intptr = (int *) &options->log_facility; | |
1117 | arg = strdelim(&cp); | |
1118 | value = log_facility_number(arg); | |
1119 | if (value == SYSLOG_FACILITY_NOT_SET) | |
1120 | fatal("%.200s line %d: unsupported log facility '%s'", | |
1121 | filename, linenum, arg ? arg : "<NONE>"); | |
1122 | if (*intptr == -1) | |
1123 | *intptr = (SyslogFacility) value; | |
1124 | break; | |
1125 | ||
1126 | case sLogLevel: | |
1127 | intptr = (int *) &options->log_level; | |
1128 | arg = strdelim(&cp); | |
1129 | value = log_level_number(arg); | |
1130 | if (value == SYSLOG_LEVEL_NOT_SET) | |
1131 | fatal("%.200s line %d: unsupported log level '%s'", | |
1132 | filename, linenum, arg ? arg : "<NONE>"); | |
1133 | if (*intptr == -1) | |
1134 | *intptr = (LogLevel) value; | |
1135 | break; | |
1136 | ||
1137 | case sAllowTcpForwarding: | |
1138 | intptr = &options->allow_tcp_forwarding; | |
1139 | goto parse_flag; | |
1140 | ||
1141 | case sUsePrivilegeSeparation: | |
1142 | intptr = &use_privsep; | |
1143 | goto parse_flag; | |
1144 | ||
1145 | case sAllowUsers: | |
1146 | while ((arg = strdelim(&cp)) && *arg != '\0') { | |
1147 | if (options->num_allow_users >= MAX_ALLOW_USERS) | |
1148 | fatal("%s line %d: too many allow users.", | |
1149 | filename, linenum); | |
1150 | options->allow_users[options->num_allow_users++] = | |
1151 | xstrdup(arg); | |
1152 | } | |
1153 | break; | |
1154 | ||
1155 | case sDenyUsers: | |
1156 | while ((arg = strdelim(&cp)) && *arg != '\0') { | |
1157 | if (options->num_deny_users >= MAX_DENY_USERS) | |
1158 | fatal("%s line %d: too many deny users.", | |
1159 | filename, linenum); | |
1160 | options->deny_users[options->num_deny_users++] = | |
1161 | xstrdup(arg); | |
1162 | } | |
1163 | break; | |
1164 | ||
1165 | case sAllowGroups: | |
1166 | while ((arg = strdelim(&cp)) && *arg != '\0') { | |
1167 | if (options->num_allow_groups >= MAX_ALLOW_GROUPS) | |
1168 | fatal("%s line %d: too many allow groups.", | |
1169 | filename, linenum); | |
1170 | options->allow_groups[options->num_allow_groups++] = | |
1171 | xstrdup(arg); | |
1172 | } | |
1173 | break; | |
1174 | ||
1175 | case sDenyGroups: | |
1176 | while ((arg = strdelim(&cp)) && *arg != '\0') { | |
1177 | if (options->num_deny_groups >= MAX_DENY_GROUPS) | |
1178 | fatal("%s line %d: too many deny groups.", | |
1179 | filename, linenum); | |
1180 | options->deny_groups[options->num_deny_groups++] = xstrdup(arg); | |
1181 | } | |
1182 | break; | |
1183 | ||
1184 | case sCiphers: | |
1185 | arg = strdelim(&cp); | |
1186 | if (!arg || *arg == '\0') | |
1187 | fatal("%s line %d: Missing argument.", filename, linenum); | |
1188 | if (!ciphers_valid(arg)) | |
1189 | fatal("%s line %d: Bad SSH2 cipher spec '%s'.", | |
1190 | filename, linenum, arg ? arg : "<NONE>"); | |
1191 | if (options->ciphers == NULL) | |
1192 | options->ciphers = xstrdup(arg); | |
1193 | break; | |
1194 | ||
1195 | case sMacs: | |
1196 | arg = strdelim(&cp); | |
1197 | if (!arg || *arg == '\0') | |
1198 | fatal("%s line %d: Missing argument.", filename, linenum); | |
1199 | if (!mac_valid(arg)) | |
1200 | fatal("%s line %d: Bad SSH2 mac spec '%s'.", | |
1201 | filename, linenum, arg ? arg : "<NONE>"); | |
1202 | if (options->macs == NULL) | |
1203 | options->macs = xstrdup(arg); | |
1204 | break; | |
1205 | ||
1206 | case sProtocol: | |
1207 | intptr = &options->protocol; | |
1208 | arg = strdelim(&cp); | |
1209 | if (!arg || *arg == '\0') | |
1210 | fatal("%s line %d: Missing argument.", filename, linenum); | |
1211 | value = proto_spec(arg); | |
1212 | if (value == SSH_PROTO_UNKNOWN) | |
1213 | fatal("%s line %d: Bad protocol spec '%s'.", | |
1214 | filename, linenum, arg ? arg : "<NONE>"); | |
1215 | if (*intptr == SSH_PROTO_UNKNOWN) | |
1216 | *intptr = value; | |
1217 | break; | |
1218 | ||
1219 | case sSubsystem: | |
1220 | if (options->num_subsystems >= MAX_SUBSYSTEMS) { | |
1221 | fatal("%s line %d: too many subsystems defined.", | |
1222 | filename, linenum); | |
1223 | } | |
1224 | arg = strdelim(&cp); | |
1225 | if (!arg || *arg == '\0') | |
1226 | fatal("%s line %d: Missing subsystem name.", | |
1227 | filename, linenum); | |
1228 | if (!*activep) { | |
1229 | arg = strdelim(&cp); | |
1230 | break; | |
1231 | } | |
1232 | for (i = 0; i < options->num_subsystems; i++) | |
1233 | if (strcmp(arg, options->subsystem_name[i]) == 0) | |
1234 | fatal("%s line %d: Subsystem '%s' already defined.", | |
1235 | filename, linenum, arg); | |
1236 | options->subsystem_name[options->num_subsystems] = xstrdup(arg); | |
1237 | arg = strdelim(&cp); | |
1238 | if (!arg || *arg == '\0') | |
1239 | fatal("%s line %d: Missing subsystem command.", | |
1240 | filename, linenum); | |
1241 | options->subsystem_command[options->num_subsystems] = xstrdup(arg); | |
1242 | ||
1243 | /* Collect arguments (separate to executable) */ | |
1244 | p = xstrdup(arg); | |
1245 | len = strlen(p) + 1; | |
1246 | while ((arg = strdelim(&cp)) != NULL && *arg != '\0') { | |
1247 | len += 1 + strlen(arg); | |
1248 | p = xrealloc(p, 1, len); | |
1249 | strlcat(p, " ", len); | |
1250 | strlcat(p, arg, len); | |
1251 | } | |
1252 | options->subsystem_args[options->num_subsystems] = p; | |
1253 | options->num_subsystems++; | |
1254 | break; | |
1255 | ||
1256 | case sMaxStartups: | |
1257 | arg = strdelim(&cp); | |
1258 | if (!arg || *arg == '\0') | |
1259 | fatal("%s line %d: Missing MaxStartups spec.", | |
1260 | filename, linenum); | |
1261 | if ((n = sscanf(arg, "%d:%d:%d", | |
1262 | &options->max_startups_begin, | |
1263 | &options->max_startups_rate, | |
1264 | &options->max_startups)) == 3) { | |
1265 | if (options->max_startups_begin > | |
1266 | options->max_startups || | |
1267 | options->max_startups_rate > 100 || | |
1268 | options->max_startups_rate < 1) | |
1269 | fatal("%s line %d: Illegal MaxStartups spec.", | |
1270 | filename, linenum); | |
1271 | } else if (n != 1) | |
1272 | fatal("%s line %d: Illegal MaxStartups spec.", | |
1273 | filename, linenum); | |
1274 | else | |
1275 | options->max_startups = options->max_startups_begin; | |
1276 | break; | |
1277 | ||
1278 | case sMaxAuthTries: | |
1279 | intptr = &options->max_authtries; | |
1280 | goto parse_int; | |
1281 | ||
1282 | case sBanner: | |
1283 | charptr = &options->banner; | |
1284 | goto parse_filename; | |
1285 | /* | |
1286 | * These options can contain %X options expanded at | |
1287 | * connect time, so that you can specify paths like: | |
1288 | * | |
1289 | * AuthorizedKeysFile /etc/ssh_keys/%u | |
1290 | */ | |
1291 | case sAuthorizedKeysFile: | |
1292 | case sAuthorizedKeysFile2: | |
1293 | charptr = (opcode == sAuthorizedKeysFile) ? | |
1294 | &options->authorized_keys_file : | |
1295 | &options->authorized_keys_file2; | |
1296 | goto parse_filename; | |
1297 | ||
1298 | case sClientAliveInterval: | |
1299 | intptr = &options->client_alive_interval; | |
1300 | goto parse_time; | |
1301 | ||
1302 | case sClientAliveCountMax: | |
1303 | intptr = &options->client_alive_count_max; | |
1304 | goto parse_int; | |
1305 | ||
1306 | case sAcceptEnv: | |
1307 | while ((arg = strdelim(&cp)) && *arg != '\0') { | |
1308 | if (strchr(arg, '=') != NULL) | |
1309 | fatal("%s line %d: Invalid environment name.", | |
1310 | filename, linenum); | |
1311 | if (options->num_accept_env >= MAX_ACCEPT_ENV) | |
1312 | fatal("%s line %d: too many allow env.", | |
1313 | filename, linenum); | |
1314 | if (!*activep) | |
1315 | break; | |
1316 | options->accept_env[options->num_accept_env++] = | |
1317 | xstrdup(arg); | |
1318 | } | |
1319 | break; | |
1320 | ||
1321 | case sPermitTunnel: | |
1322 | intptr = &options->permit_tun; | |
1323 | arg = strdelim(&cp); | |
1324 | if (!arg || *arg == '\0') | |
1325 | fatal("%s line %d: Missing yes/point-to-point/" | |
1326 | "ethernet/no argument.", filename, linenum); | |
1327 | value = 0; /* silence compiler */ | |
1328 | if (strcasecmp(arg, "ethernet") == 0) | |
1329 | value = SSH_TUNMODE_ETHERNET; | |
1330 | else if (strcasecmp(arg, "point-to-point") == 0) | |
1331 | value = SSH_TUNMODE_POINTOPOINT; | |
1332 | else if (strcasecmp(arg, "yes") == 0) | |
1333 | value = SSH_TUNMODE_YES; | |
1334 | else if (strcasecmp(arg, "no") == 0) | |
1335 | value = SSH_TUNMODE_NO; | |
1336 | else | |
1337 | fatal("%s line %d: Bad yes/point-to-point/ethernet/" | |
1338 | "no argument: %s", filename, linenum, arg); | |
1339 | if (*intptr == -1) | |
1340 | *intptr = value; | |
1341 | break; | |
1342 | ||
1343 | case sMatch: | |
1344 | if (cmdline) | |
1345 | fatal("Match directive not supported as a command-line " | |
1346 | "option"); | |
1347 | value = match_cfg_line(&cp, linenum, user, host, address); | |
1348 | if (value < 0) | |
1349 | fatal("%s line %d: Bad Match condition", filename, | |
1350 | linenum); | |
1351 | *activep = value; | |
1352 | break; | |
1353 | ||
1354 | case sPermitOpen: | |
1355 | arg = strdelim(&cp); | |
1356 | if (!arg || *arg == '\0') | |
1357 | fatal("%s line %d: missing PermitOpen specification", | |
1358 | filename, linenum); | |
1359 | n = options->num_permitted_opens; /* modified later */ | |
1360 | if (strcmp(arg, "any") == 0) { | |
1361 | if (*activep && n == -1) { | |
1362 | channel_clear_adm_permitted_opens(); | |
1363 | options->num_permitted_opens = 0; | |
1364 | } | |
1365 | break; | |
1366 | } | |
1367 | if (*activep && n == -1) | |
1368 | channel_clear_adm_permitted_opens(); | |
1369 | for (; arg != NULL && *arg != '\0'; arg = strdelim(&cp)) { | |
1370 | p = hpdelim(&arg); | |
1371 | if (p == NULL) | |
1372 | fatal("%s line %d: missing host in PermitOpen", | |
1373 | filename, linenum); | |
1374 | p = cleanhostname(p); | |
1375 | if (arg == NULL || (port = a2port(arg)) == 0) | |
1376 | fatal("%s line %d: bad port number in " | |
1377 | "PermitOpen", filename, linenum); | |
1378 | if (*activep && n == -1) | |
1379 | options->num_permitted_opens = | |
1380 | channel_add_adm_permitted_opens(p, port); | |
1381 | } | |
1382 | break; | |
1383 | ||
1384 | case sForceCommand: | |
1385 | if (cp == NULL) | |
1386 | fatal("%.200s line %d: Missing argument.", filename, | |
1387 | linenum); | |
1388 | len = strspn(cp, WHITESPACE); | |
1389 | if (*activep && options->adm_forced_command == NULL) | |
1390 | options->adm_forced_command = xstrdup(cp + len); | |
1391 | return 0; | |
1392 | ||
1393 | case sDeprecated: | |
1394 | logit("%s line %d: Deprecated option %s", | |
1395 | filename, linenum, arg); | |
1396 | while (arg) | |
1397 | arg = strdelim(&cp); | |
1398 | break; | |
1399 | ||
1400 | case sUnsupported: | |
1401 | logit("%s line %d: Unsupported option %s", | |
1402 | filename, linenum, arg); | |
1403 | while (arg) | |
1404 | arg = strdelim(&cp); | |
1405 | break; | |
1406 | ||
1407 | default: | |
1408 | fatal("%s line %d: Missing handler for opcode %s (%d)", | |
1409 | filename, linenum, arg, opcode); | |
1410 | } | |
1411 | if ((arg = strdelim(&cp)) != NULL && *arg != '\0') | |
1412 | fatal("%s line %d: garbage at end of line; \"%.200s\".", | |
1413 | filename, linenum, arg); | |
1414 | return 0; | |
1415 | } | |
1416 | ||
1417 | /* Reads the server configuration file. */ | |
1418 | ||
1419 | void | |
1420 | load_server_config(const char *filename, Buffer *conf) | |
1421 | { | |
1422 | char line[1024], *cp; | |
1423 | FILE *f; | |
1424 | ||
1425 | debug2("%s: filename %s", __func__, filename); | |
1426 | if ((f = fopen(filename, "r")) == NULL) { | |
1427 | perror(filename); | |
1428 | exit(1); | |
1429 | } | |
1430 | buffer_clear(conf); | |
1431 | while (fgets(line, sizeof(line), f)) { | |
1432 | /* | |
1433 | * Trim out comments and strip whitespace | |
1434 | * NB - preserve newlines, they are needed to reproduce | |
1435 | * line numbers later for error messages | |
1436 | */ | |
1437 | if ((cp = strchr(line, '#')) != NULL) | |
1438 | memcpy(cp, "\n", 2); | |
1439 | cp = line + strspn(line, " \t\r"); | |
1440 | ||
1441 | buffer_append(conf, cp, strlen(cp)); | |
1442 | } | |
1443 | buffer_append(conf, "\0", 1); | |
1444 | fclose(f); | |
1445 | debug2("%s: done config len = %d", __func__, buffer_len(conf)); | |
1446 | } | |
1447 | ||
1448 | void | |
1449 | parse_server_match_config(ServerOptions *options, const char *user, | |
1450 | const char *host, const char *address) | |
1451 | { | |
1452 | ServerOptions mo; | |
1453 | ||
1454 | initialize_server_options(&mo); | |
1455 | parse_server_config(&mo, "reprocess config", &cfg, user, host, address); | |
1456 | copy_set_server_options(options, &mo, 0); | |
1457 | } | |
1458 | ||
1459 | /* Helper macros */ | |
1460 | #define M_CP_INTOPT(n) do {\ | |
1461 | if (src->n != -1) \ | |
1462 | dst->n = src->n; \ | |
1463 | } while (0) | |
1464 | #define M_CP_STROPT(n) do {\ | |
1465 | if (src->n != NULL) { \ | |
1466 | if (dst->n != NULL) \ | |
1467 | xfree(dst->n); \ | |
1468 | dst->n = src->n; \ | |
1469 | } \ | |
1470 | } while(0) | |
1471 | ||
1472 | /* | |
1473 | * Copy any supported values that are set. | |
1474 | * | |
1475 | * If the preauth flag is set, we do not bother copying the the string or | |
1476 | * array values that are not used pre-authentication, because any that we | |
1477 | * do use must be explictly sent in mm_getpwnamallow(). | |
1478 | */ | |
1479 | void | |
1480 | copy_set_server_options(ServerOptions *dst, ServerOptions *src, int preauth) | |
1481 | { | |
1482 | M_CP_INTOPT(password_authentication); | |
1483 | M_CP_INTOPT(gss_authentication); | |
1484 | M_CP_INTOPT(rsa_authentication); | |
1485 | M_CP_INTOPT(pubkey_authentication); | |
1486 | M_CP_INTOPT(kerberos_authentication); | |
1487 | M_CP_INTOPT(hostbased_authentication); | |
1488 | M_CP_INTOPT(kbd_interactive_authentication); | |
1489 | ||
1490 | M_CP_INTOPT(allow_tcp_forwarding); | |
1491 | M_CP_INTOPT(gateway_ports); | |
1492 | M_CP_INTOPT(x11_display_offset); | |
1493 | M_CP_INTOPT(x11_forwarding); | |
1494 | M_CP_INTOPT(x11_use_localhost); | |
1495 | ||
1496 | M_CP_STROPT(banner); | |
1497 | if (preauth) | |
1498 | return; | |
1499 | M_CP_STROPT(adm_forced_command); | |
1500 | } | |
1501 | ||
1502 | #undef M_CP_INTOPT | |
1503 | #undef M_CP_STROPT | |
1504 | ||
1505 | void | |
1506 | parse_server_config(ServerOptions *options, const char *filename, Buffer *conf, | |
1507 | const char *user, const char *host, const char *address) | |
1508 | { | |
1509 | int active, linenum, bad_options = 0; | |
1510 | char *cp, *obuf, *cbuf; | |
1511 | ||
1512 | debug2("%s: config %s len %d", __func__, filename, buffer_len(conf)); | |
1513 | ||
1514 | obuf = cbuf = xstrdup(buffer_ptr(conf)); | |
1515 | active = user ? 0 : 1; | |
1516 | linenum = 1; | |
1517 | while ((cp = strsep(&cbuf, "\n")) != NULL) { | |
1518 | if (process_server_config_line(options, cp, filename, | |
1519 | linenum++, &active, user, host, address) != 0) | |
1520 | bad_options++; | |
1521 | } | |
1522 | xfree(obuf); | |
1523 | if (bad_options > 0) | |
1524 | fatal("%s: terminating, %d bad configuration options", | |
1525 | filename, bad_options); | |
1526 | } |