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51b787f2 | 1 | /* $OpenBSD: servconf.c,v 1.172 2007/04/23 10:15:39 dtucker Exp $ */ |
8efc0c15 | 2 | /* |
5260325f | 3 | * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland |
4 | * All rights reserved | |
6ae2364d | 5 | * |
bcbf86ec | 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". | |
5260325f | 11 | */ |
8efc0c15 | 12 | |
13 | #include "includes.h" | |
8efc0c15 | 14 | |
5b04a8bf | 15 | #include <sys/types.h> |
16 | #include <sys/socket.h> | |
17 | ||
28cb0a43 | 18 | #include <netdb.h> |
fa47fe3c | 19 | #include <pwd.h> |
cf851879 | 20 | #include <stdio.h> |
ffa517a8 | 21 | #include <stdlib.h> |
00146caa | 22 | #include <string.h> |
31652869 | 23 | #include <signal.h> |
5188ba17 | 24 | #include <unistd.h> |
31652869 | 25 | #include <stdarg.h> |
c8dfff33 | 26 | |
31652869 | 27 | #include "xmalloc.h" |
8efc0c15 | 28 | #include "ssh.h" |
42f11eb2 | 29 | #include "log.h" |
31652869 | 30 | #include "buffer.h" |
8efc0c15 | 31 | #include "servconf.h" |
a8be9f80 | 32 | #include "compat.h" |
42f11eb2 | 33 | #include "pathnames.h" |
42f11eb2 | 34 | #include "misc.h" |
35 | #include "cipher.h" | |
31652869 | 36 | #include "key.h" |
b2552997 | 37 | #include "kex.h" |
38 | #include "mac.h" | |
d231781a | 39 | #include "match.h" |
2fefbadf | 40 | #include "channels.h" |
fa47fe3c | 41 | #include "groupaccess.h" |
42f11eb2 | 42 | |
396c147e | 43 | static void add_listen_addr(ServerOptions *, char *, u_short); |
44 | static void add_one_listen_addr(ServerOptions *, char *, u_short); | |
48e671d5 | 45 | |
1853d1ef | 46 | /* Use of privilege separation or not */ |
47 | extern int use_privsep; | |
d231781a | 48 | extern Buffer cfg; |
42f11eb2 | 49 | |
8efc0c15 | 50 | /* Initializes the server options to their default values. */ |
51 | ||
6ae2364d | 52 | void |
5260325f | 53 | initialize_server_options(ServerOptions *options) |
8efc0c15 | 54 | { |
5260325f | 55 | memset(options, 0, sizeof(*options)); |
e15895cd | 56 | |
57 | /* Portable-specific options */ | |
7fceb20d | 58 | options->use_pam = -1; |
e15895cd | 59 | |
60 | /* Standard Options */ | |
48e671d5 | 61 | options->num_ports = 0; |
62 | options->ports_from_cmdline = 0; | |
63 | options->listen_addrs = NULL; | |
31b41ceb | 64 | options->address_family = -1; |
fa08c86b | 65 | options->num_host_key_files = 0; |
0fbe8c74 | 66 | options->pid_file = NULL; |
5260325f | 67 | options->server_key_bits = -1; |
68 | options->login_grace_time = -1; | |
69 | options->key_regeneration_time = -1; | |
15853e93 | 70 | options->permit_root_login = PERMIT_NOT_SET; |
5260325f | 71 | options->ignore_rhosts = -1; |
72 | options->ignore_user_known_hosts = -1; | |
73 | options->print_motd = -1; | |
4f4648f9 | 74 | options->print_lastlog = -1; |
5260325f | 75 | options->x11_forwarding = -1; |
76 | options->x11_display_offset = -1; | |
e6e573bd | 77 | options->x11_use_localhost = -1; |
fa649821 | 78 | options->xauth_location = NULL; |
5260325f | 79 | options->strict_modes = -1; |
fd573618 | 80 | options->tcp_keep_alive = -1; |
5eaf8578 | 81 | options->log_facility = SYSLOG_FACILITY_NOT_SET; |
82 | options->log_level = SYSLOG_LEVEL_NOT_SET; | |
5260325f | 83 | options->rhosts_rsa_authentication = -1; |
8002af61 | 84 | options->hostbased_authentication = -1; |
85 | options->hostbased_uses_name_from_packet_only = -1; | |
5260325f | 86 | options->rsa_authentication = -1; |
fa08c86b | 87 | options->pubkey_authentication = -1; |
5260325f | 88 | options->kerberos_authentication = -1; |
89 | options->kerberos_or_local_passwd = -1; | |
90 | options->kerberos_ticket_cleanup = -1; | |
a1e30b47 | 91 | options->kerberos_get_afs_token = -1; |
7364bd04 | 92 | options->gss_authentication=-1; |
93 | options->gss_cleanup_creds = -1; | |
5260325f | 94 | options->password_authentication = -1; |
94ec8c6b | 95 | options->kbd_interactive_authentication = -1; |
5ba55ada | 96 | options->challenge_response_authentication = -1; |
5260325f | 97 | options->permit_empty_passwd = -1; |
f00bab84 | 98 | options->permit_user_env = -1; |
5260325f | 99 | options->use_login = -1; |
636f76ca | 100 | options->compression = -1; |
33de75a3 | 101 | options->allow_tcp_forwarding = -1; |
5260325f | 102 | options->num_allow_users = 0; |
103 | options->num_deny_users = 0; | |
104 | options->num_allow_groups = 0; | |
105 | options->num_deny_groups = 0; | |
a8be9f80 | 106 | options->ciphers = NULL; |
b2552997 | 107 | options->macs = NULL; |
a8be9f80 | 108 | options->protocol = SSH_PROTO_UNKNOWN; |
1d1ffb87 | 109 | options->gateway_ports = -1; |
38c295d6 | 110 | options->num_subsystems = 0; |
c345cf9d | 111 | options->max_startups_begin = -1; |
112 | options->max_startups_rate = -1; | |
089fbbd2 | 113 | options->max_startups = -1; |
af4bd935 | 114 | options->max_authtries = -1; |
eea39c02 | 115 | options->banner = NULL; |
c5a7d788 | 116 | options->use_dns = -1; |
3ffc6336 | 117 | options->client_alive_interval = -1; |
118 | options->client_alive_count_max = -1; | |
c8445989 | 119 | options->authorized_keys_file = NULL; |
120 | options->authorized_keys_file2 = NULL; | |
61a2c1da | 121 | options->num_accept_env = 0; |
d20f3c9e | 122 | options->permit_tun = -1; |
ea46e550 | 123 | options->num_permitted_opens = -1; |
e7259e8d | 124 | options->adm_forced_command = NULL; |
8efc0c15 | 125 | } |
126 | ||
6ae2364d | 127 | void |
5260325f | 128 | fill_default_server_options(ServerOptions *options) |
8efc0c15 | 129 | { |
e15895cd | 130 | /* Portable-specific options */ |
7fceb20d | 131 | if (options->use_pam == -1) |
0a23d79f | 132 | options->use_pam = 0; |
e15895cd | 133 | |
134 | /* Standard Options */ | |
fa08c86b | 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) | |
0f84fe37 | 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 | } | |
fa08c86b | 148 | } |
48e671d5 | 149 | if (options->num_ports == 0) |
150 | options->ports[options->num_ports++] = SSH_DEFAULT_PORT; | |
151 | if (options->listen_addrs == NULL) | |
2d2a2c65 | 152 | add_listen_addr(options, NULL, 0); |
0fbe8c74 | 153 | if (options->pid_file == NULL) |
42f11eb2 | 154 | options->pid_file = _PATH_SSH_DAEMON_PID_FILE; |
5260325f | 155 | if (options->server_key_bits == -1) |
156 | options->server_key_bits = 768; | |
157 | if (options->login_grace_time == -1) | |
3445ca02 | 158 | options->login_grace_time = 120; |
5260325f | 159 | if (options->key_regeneration_time == -1) |
160 | options->key_regeneration_time = 3600; | |
15853e93 | 161 | if (options->permit_root_login == PERMIT_NOT_SET) |
162 | options->permit_root_login = PERMIT_YES; | |
5260325f | 163 | if (options->ignore_rhosts == -1) |
c8d54615 | 164 | options->ignore_rhosts = 1; |
5260325f | 165 | if (options->ignore_user_known_hosts == -1) |
166 | options->ignore_user_known_hosts = 0; | |
5260325f | 167 | if (options->print_motd == -1) |
168 | options->print_motd = 1; | |
4f4648f9 | 169 | if (options->print_lastlog == -1) |
170 | options->print_lastlog = 1; | |
5260325f | 171 | if (options->x11_forwarding == -1) |
c8d54615 | 172 | options->x11_forwarding = 0; |
5260325f | 173 | if (options->x11_display_offset == -1) |
c8d54615 | 174 | options->x11_display_offset = 10; |
e6e573bd | 175 | if (options->x11_use_localhost == -1) |
176 | options->x11_use_localhost = 1; | |
fa649821 | 177 | if (options->xauth_location == NULL) |
fd9ede94 | 178 | options->xauth_location = _PATH_XAUTH; |
5260325f | 179 | if (options->strict_modes == -1) |
180 | options->strict_modes = 1; | |
fd573618 | 181 | if (options->tcp_keep_alive == -1) |
182 | options->tcp_keep_alive = 1; | |
5eaf8578 | 183 | if (options->log_facility == SYSLOG_FACILITY_NOT_SET) |
5260325f | 184 | options->log_facility = SYSLOG_FACILITY_AUTH; |
5eaf8578 | 185 | if (options->log_level == SYSLOG_LEVEL_NOT_SET) |
59c97189 | 186 | options->log_level = SYSLOG_LEVEL_INFO; |
5260325f | 187 | if (options->rhosts_rsa_authentication == -1) |
c8d54615 | 188 | options->rhosts_rsa_authentication = 0; |
8002af61 | 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; | |
5260325f | 193 | if (options->rsa_authentication == -1) |
194 | options->rsa_authentication = 1; | |
fa08c86b | 195 | if (options->pubkey_authentication == -1) |
196 | options->pubkey_authentication = 1; | |
5260325f | 197 | if (options->kerberos_authentication == -1) |
eadc806d | 198 | options->kerberos_authentication = 0; |
5260325f | 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; | |
a1e30b47 | 203 | if (options->kerberos_get_afs_token == -1) |
204 | options->kerberos_get_afs_token = 0; | |
7364bd04 | 205 | if (options->gss_authentication == -1) |
206 | options->gss_authentication = 0; | |
207 | if (options->gss_cleanup_creds == -1) | |
208 | options->gss_cleanup_creds = 1; | |
5260325f | 209 | if (options->password_authentication == -1) |
210 | options->password_authentication = 1; | |
94ec8c6b | 211 | if (options->kbd_interactive_authentication == -1) |
212 | options->kbd_interactive_authentication = 0; | |
5ba55ada | 213 | if (options->challenge_response_authentication == -1) |
214 | options->challenge_response_authentication = 1; | |
5260325f | 215 | if (options->permit_empty_passwd == -1) |
c8d54615 | 216 | options->permit_empty_passwd = 0; |
f00bab84 | 217 | if (options->permit_user_env == -1) |
218 | options->permit_user_env = 0; | |
5260325f | 219 | if (options->use_login == -1) |
220 | options->use_login = 0; | |
636f76ca | 221 | if (options->compression == -1) |
07200973 | 222 | options->compression = COMP_DELAYED; |
33de75a3 | 223 | if (options->allow_tcp_forwarding == -1) |
224 | options->allow_tcp_forwarding = 1; | |
1d1ffb87 | 225 | if (options->gateway_ports == -1) |
226 | options->gateway_ports = 0; | |
089fbbd2 | 227 | if (options->max_startups == -1) |
228 | options->max_startups = 10; | |
c345cf9d | 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; | |
af4bd935 | 233 | if (options->max_authtries == -1) |
234 | options->max_authtries = DEFAULT_AUTH_FAIL_MAX; | |
c5a7d788 | 235 | if (options->use_dns == -1) |
236 | options->use_dns = 1; | |
3ffc6336 | 237 | if (options->client_alive_interval == -1) |
184eed6a | 238 | options->client_alive_interval = 0; |
3ffc6336 | 239 | if (options->client_alive_count_max == -1) |
240 | options->client_alive_count_max = 3; | |
5df83e07 | 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; | |
d20f3c9e | 250 | if (options->permit_tun == -1) |
a4f24bf8 | 251 | options->permit_tun = SSH_TUNMODE_NO; |
1853d1ef | 252 | |
2ee1b704 | 253 | /* Turn privilege separation on by default */ |
1853d1ef | 254 | if (use_privsep == -1) |
2ee1b704 | 255 | use_privsep = 1; |
e299a298 | 256 | |
4165b82e | 257 | #ifndef HAVE_MMAP |
e299a298 | 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 | ||
8efc0c15 | 266 | } |
267 | ||
8efc0c15 | 268 | /* Keyword tokens. */ |
5260325f | 269 | typedef enum { |
270 | sBadOption, /* == unknown option */ | |
e15895cd | 271 | /* Portable-specific options */ |
7fceb20d | 272 | sUsePAM, |
e15895cd | 273 | /* Standard Options */ |
5260325f | 274 | sPort, sHostKeyFile, sServerKeyBits, sLoginGraceTime, sKeyRegenerationTime, |
275 | sPermitRootLogin, sLogFacility, sLogLevel, | |
0598d99d | 276 | sRhostsRSAAuthentication, sRSAAuthentication, |
5260325f | 277 | sKerberosAuthentication, sKerberosOrLocalPasswd, sKerberosTicketCleanup, |
a1e30b47 | 278 | sKerberosGetAFSToken, |
1c590258 | 279 | sKerberosTgtPassing, sChallengeResponseAuthentication, |
31b41ceb | 280 | sPasswordAuthentication, sKbdInteractiveAuthentication, |
281 | sListenAddress, sAddressFamily, | |
4f4648f9 | 282 | sPrintMotd, sPrintLastLog, sIgnoreRhosts, |
e6e573bd | 283 | sX11Forwarding, sX11DisplayOffset, sX11UseLocalhost, |
fd573618 | 284 | sStrictModes, sEmptyPasswd, sTCPKeepAlive, |
f00bab84 | 285 | sPermitUserEnvironment, sUseLogin, sAllowTcpForwarding, sCompression, |
33de75a3 | 286 | sAllowUsers, sDenyUsers, sAllowGroups, sDenyGroups, |
b2552997 | 287 | sIgnoreUserKnownHosts, sCiphers, sMacs, sProtocol, sPidFile, |
af4bd935 | 288 | sGatewayPorts, sPubkeyAuthentication, sXAuthLocation, sSubsystem, |
289 | sMaxStartups, sMaxAuthTries, | |
c5a7d788 | 290 | sBanner, sUseDNS, sHostbasedAuthentication, |
184eed6a | 291 | sHostbasedUsesNameFromPacketOnly, sClientAliveInterval, |
c8445989 | 292 | sClientAliveCountMax, sAuthorizedKeysFile, sAuthorizedKeysFile2, |
d20f3c9e | 293 | sGssAuthentication, sGssCleanupCreds, sAcceptEnv, sPermitTunnel, |
e7259e8d | 294 | sMatch, sPermitOpen, sForceCommand, |
2ea6de2b | 295 | sUsePrivilegeSeparation, |
a2144546 | 296 | sDeprecated, sUnsupported |
8efc0c15 | 297 | } ServerOpCodes; |
298 | ||
d231781a | 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 | ||
8efc0c15 | 303 | /* Textual representation of the tokens. */ |
5260325f | 304 | static struct { |
305 | const char *name; | |
306 | ServerOpCodes opcode; | |
d231781a | 307 | u_int flags; |
5260325f | 308 | } keywords[] = { |
e15895cd | 309 | /* Portable-specific options */ |
b06b11ad | 310 | #ifdef USE_PAM |
d231781a | 311 | { "usepam", sUsePAM, SSHCFG_GLOBAL }, |
b06b11ad | 312 | #else |
d231781a | 313 | { "usepam", sUnsupported, SSHCFG_GLOBAL }, |
b06b11ad | 314 | #endif |
d231781a | 315 | { "pamauthenticationviakbdint", sDeprecated, SSHCFG_GLOBAL }, |
e15895cd | 316 | /* Standard Options */ |
d231781a | 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 }, | |
03bcbf84 | 328 | { "rhostsrsaauthentication", sRhostsRSAAuthentication, SSHCFG_ALL }, |
329 | { "hostbasedauthentication", sHostbasedAuthentication, SSHCFG_ALL }, | |
d231781a | 330 | { "hostbasedusesnamefrompacketonly", sHostbasedUsesNameFromPacketOnly, SSHCFG_GLOBAL }, |
03bcbf84 | 331 | { "rsaauthentication", sRSAAuthentication, SSHCFG_ALL }, |
332 | { "pubkeyauthentication", sPubkeyAuthentication, SSHCFG_ALL }, | |
d231781a | 333 | { "dsaauthentication", sPubkeyAuthentication, SSHCFG_GLOBAL }, /* alias */ |
1c590258 | 334 | #ifdef KRB5 |
03bcbf84 | 335 | { "kerberosauthentication", sKerberosAuthentication, SSHCFG_ALL }, |
d231781a | 336 | { "kerberosorlocalpasswd", sKerberosOrLocalPasswd, SSHCFG_GLOBAL }, |
337 | { "kerberosticketcleanup", sKerberosTicketCleanup, SSHCFG_GLOBAL }, | |
bcfcc5f9 | 338 | #ifdef USE_AFS |
d231781a | 339 | { "kerberosgetafstoken", sKerberosGetAFSToken, SSHCFG_GLOBAL }, |
309af4e5 | 340 | #else |
d231781a | 341 | { "kerberosgetafstoken", sUnsupported, SSHCFG_GLOBAL }, |
309af4e5 | 342 | #endif |
a2144546 | 343 | #else |
03bcbf84 | 344 | { "kerberosauthentication", sUnsupported, SSHCFG_ALL }, |
d231781a | 345 | { "kerberosorlocalpasswd", sUnsupported, SSHCFG_GLOBAL }, |
346 | { "kerberosticketcleanup", sUnsupported, SSHCFG_GLOBAL }, | |
347 | { "kerberosgetafstoken", sUnsupported, SSHCFG_GLOBAL }, | |
a2144546 | 348 | #endif |
d231781a | 349 | { "kerberostgtpassing", sUnsupported, SSHCFG_GLOBAL }, |
350 | { "afstokenpassing", sUnsupported, SSHCFG_GLOBAL }, | |
7364bd04 | 351 | #ifdef GSSAPI |
03bcbf84 | 352 | { "gssapiauthentication", sGssAuthentication, SSHCFG_ALL }, |
d231781a | 353 | { "gssapicleanupcredentials", sGssCleanupCreds, SSHCFG_GLOBAL }, |
7364bd04 | 354 | #else |
03bcbf84 | 355 | { "gssapiauthentication", sUnsupported, SSHCFG_ALL }, |
d231781a | 356 | { "gssapicleanupcredentials", sUnsupported, SSHCFG_GLOBAL }, |
7364bd04 | 357 | #endif |
03bcbf84 | 358 | { "passwordauthentication", sPasswordAuthentication, SSHCFG_ALL }, |
359 | { "kbdinteractiveauthentication", sKbdInteractiveAuthentication, SSHCFG_ALL }, | |
121c4a34 | 360 | { "challengeresponseauthentication", sChallengeResponseAuthentication, SSHCFG_GLOBAL }, |
d231781a | 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 }, | |
691712e0 | 369 | { "x11forwarding", sX11Forwarding, SSHCFG_ALL }, |
370 | { "x11displayoffset", sX11DisplayOffset, SSHCFG_ALL }, | |
371 | { "x11uselocalhost", sX11UseLocalhost, SSHCFG_ALL }, | |
d231781a | 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 }, | |
03bcbf84 | 392 | { "banner", sBanner, SSHCFG_ALL }, |
d231781a | 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 }, | |
2fefbadf | 403 | { "match", sMatch, SSHCFG_ALL }, |
404 | { "permitopen", sPermitOpen, SSHCFG_ALL }, | |
e7259e8d | 405 | { "forcecommand", sForceCommand, SSHCFG_ALL }, |
d231781a | 406 | { NULL, sBadOption, 0 } |
8efc0c15 | 407 | }; |
408 | ||
aa3378df | 409 | /* |
6be9a5e8 | 410 | * Returns the number of the token pointed to by cp or sBadOption. |
aa3378df | 411 | */ |
8efc0c15 | 412 | |
6ae2364d | 413 | static ServerOpCodes |
5260325f | 414 | parse_token(const char *cp, const char *filename, |
d231781a | 415 | int linenum, u_int *flags) |
8efc0c15 | 416 | { |
1e3b8b07 | 417 | u_int i; |
8efc0c15 | 418 | |
5260325f | 419 | for (i = 0; keywords[i].name; i++) |
d231781a | 420 | if (strcasecmp(cp, keywords[i].name) == 0) { |
421 | *flags = keywords[i].flags; | |
5260325f | 422 | return keywords[i].opcode; |
d231781a | 423 | } |
8efc0c15 | 424 | |
b7c70970 | 425 | error("%s: line %d: Bad configuration option: %s", |
426 | filename, linenum, cp); | |
5260325f | 427 | return sBadOption; |
8efc0c15 | 428 | } |
429 | ||
396c147e | 430 | static void |
2d2a2c65 | 431 | add_listen_addr(ServerOptions *options, char *addr, u_short port) |
48e671d5 | 432 | { |
2ceb8101 | 433 | u_int i; |
48e671d5 | 434 | |
435 | if (options->num_ports == 0) | |
436 | options->ports[options->num_ports++] = SSH_DEFAULT_PORT; | |
31b41ceb | 437 | if (options->address_family == -1) |
438 | options->address_family = AF_UNSPEC; | |
2d2a2c65 | 439 | if (port == 0) |
d11c1288 | 440 | for (i = 0; i < options->num_ports; i++) |
441 | add_one_listen_addr(options, addr, options->ports[i]); | |
442 | else | |
2d2a2c65 | 443 | add_one_listen_addr(options, addr, port); |
d11c1288 | 444 | } |
445 | ||
396c147e | 446 | static void |
d11c1288 | 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)); | |
31b41ceb | 454 | hints.ai_family = options->address_family; |
d11c1288 | 455 | hints.ai_socktype = SOCK_STREAM; |
456 | hints.ai_flags = (addr == NULL) ? AI_PASSIVE : 0; | |
7528d467 | 457 | snprintf(strport, sizeof strport, "%u", port); |
d11c1288 | 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; | |
48e671d5 | 466 | } |
467 | ||
d231781a | 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 | ||
fa47fe3c | 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 | ||
d231781a | 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); | |
fa47fe3c | 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 | } | |
d231781a | 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) { | |
d231781a | 595 | if (!address) { |
596 | result = 0; | |
597 | continue; | |
598 | } | |
599 | if (match_hostname(address, arg, len) != 1) | |
600 | result = 0; | |
601 | else | |
602 | debug("connection from %.100s matched 'Address " | |
603 | "%.100s' at line %d", address, arg, line); | |
604 | } else { | |
605 | error("Unsupported Match attribute %s", attrib); | |
606 | return -1; | |
607 | } | |
608 | } | |
609 | if (user != NULL) | |
610 | debug3("match %sfound", result ? "" : "not "); | |
611 | *condition = cp; | |
612 | return result; | |
613 | } | |
614 | ||
e7259e8d | 615 | #define WHITESPACE " \t\r\n" |
616 | ||
2717fa0f | 617 | int |
618 | process_server_config_line(ServerOptions *options, char *line, | |
d231781a | 619 | const char *filename, int linenum, int *activep, const char *user, |
620 | const char *host, const char *address) | |
8efc0c15 | 621 | { |
d11c1288 | 622 | char *cp, **charptr, *arg, *p; |
d231781a | 623 | int cmdline = 0, *intptr, value, n; |
5260325f | 624 | ServerOpCodes opcode; |
3867aa0a | 625 | u_short port; |
d231781a | 626 | u_int i, flags = 0; |
d66ce1a1 | 627 | size_t len; |
5260325f | 628 | |
2717fa0f | 629 | cp = line; |
0f8cd5a6 | 630 | if ((arg = strdelim(&cp)) == NULL) |
88299971 | 631 | return 0; |
2717fa0f | 632 | /* Ignore leading whitespace */ |
633 | if (*arg == '\0') | |
704b1659 | 634 | arg = strdelim(&cp); |
2717fa0f | 635 | if (!arg || !*arg || *arg == '#') |
636 | return 0; | |
637 | intptr = NULL; | |
638 | charptr = NULL; | |
d231781a | 639 | opcode = parse_token(arg, filename, linenum, &flags); |
640 | ||
641 | if (activep == NULL) { /* We are processing a command line directive */ | |
642 | cmdline = 1; | |
643 | activep = &cmdline; | |
644 | } | |
645 | if (*activep && opcode != sMatch) | |
646 | debug3("%s:%d setting %s %s", filename, linenum, arg, cp); | |
647 | if (*activep == 0 && !(flags & SSHCFG_MATCH)) { | |
648 | if (user == NULL) { | |
649 | fatal("%s line %d: Directive '%s' is not allowed " | |
650 | "within a Match block", filename, linenum, arg); | |
651 | } else { /* this is a directive we have already processed */ | |
652 | while (arg) | |
653 | arg = strdelim(&cp); | |
654 | return 0; | |
655 | } | |
656 | } | |
657 | ||
2717fa0f | 658 | switch (opcode) { |
659 | /* Portable-specific options */ | |
7fceb20d | 660 | case sUsePAM: |
661 | intptr = &options->use_pam; | |
2717fa0f | 662 | goto parse_flag; |
48e671d5 | 663 | |
2717fa0f | 664 | /* Standard Options */ |
665 | case sBadOption: | |
666 | return -1; | |
667 | case sPort: | |
668 | /* ignore ports from configfile if cmdline specifies ports */ | |
669 | if (options->ports_from_cmdline) | |
670 | return 0; | |
671 | if (options->listen_addrs != NULL) | |
672 | fatal("%s line %d: ports must be specified before " | |
3a454b6a | 673 | "ListenAddress.", filename, linenum); |
2717fa0f | 674 | if (options->num_ports >= MAX_PORTS) |
675 | fatal("%s line %d: too many ports.", | |
676 | filename, linenum); | |
677 | arg = strdelim(&cp); | |
678 | if (!arg || *arg == '\0') | |
679 | fatal("%s line %d: missing port number.", | |
680 | filename, linenum); | |
681 | options->ports[options->num_ports++] = a2port(arg); | |
682 | if (options->ports[options->num_ports-1] == 0) | |
683 | fatal("%s line %d: Badly formatted port number.", | |
684 | filename, linenum); | |
685 | break; | |
686 | ||
687 | case sServerKeyBits: | |
688 | intptr = &options->server_key_bits; | |
5260325f | 689 | parse_int: |
2717fa0f | 690 | arg = strdelim(&cp); |
691 | if (!arg || *arg == '\0') | |
692 | fatal("%s line %d: missing integer value.", | |
693 | filename, linenum); | |
694 | value = atoi(arg); | |
d231781a | 695 | if (*activep && *intptr == -1) |
2717fa0f | 696 | *intptr = value; |
697 | break; | |
698 | ||
699 | case sLoginGraceTime: | |
700 | intptr = &options->login_grace_time; | |
e2b1fb42 | 701 | parse_time: |
2717fa0f | 702 | arg = strdelim(&cp); |
703 | if (!arg || *arg == '\0') | |
704 | fatal("%s line %d: missing time value.", | |
705 | filename, linenum); | |
706 | if ((value = convtime(arg)) == -1) | |
707 | fatal("%s line %d: invalid time value.", | |
708 | filename, linenum); | |
709 | if (*intptr == -1) | |
710 | *intptr = value; | |
711 | break; | |
712 | ||
713 | case sKeyRegenerationTime: | |
714 | intptr = &options->key_regeneration_time; | |
715 | goto parse_time; | |
716 | ||
717 | case sListenAddress: | |
718 | arg = strdelim(&cp); | |
3867aa0a | 719 | if (arg == NULL || *arg == '\0') |
720 | fatal("%s line %d: missing address", | |
2717fa0f | 721 | filename, linenum); |
91135a0e | 722 | /* check for bare IPv6 address: no "[]" and 2 or more ":" */ |
723 | if (strchr(arg, '[') == NULL && (p = strchr(arg, ':')) != NULL | |
724 | && strchr(p+1, ':') != NULL) { | |
725 | add_listen_addr(options, arg, 0); | |
726 | break; | |
727 | } | |
3867aa0a | 728 | p = hpdelim(&arg); |
729 | if (p == NULL) | |
730 | fatal("%s line %d: bad address:port usage", | |
2717fa0f | 731 | filename, linenum); |
3867aa0a | 732 | p = cleanhostname(p); |
733 | if (arg == NULL) | |
734 | port = 0; | |
735 | else if ((port = a2port(arg)) == 0) | |
736 | fatal("%s line %d: bad port number", filename, linenum); | |
737 | ||
738 | add_listen_addr(options, p, port); | |
739 | ||
2717fa0f | 740 | break; |
741 | ||
31b41ceb | 742 | case sAddressFamily: |
743 | arg = strdelim(&cp); | |
38634ff6 | 744 | if (!arg || *arg == '\0') |
745 | fatal("%s line %d: missing address family.", | |
746 | filename, linenum); | |
31b41ceb | 747 | intptr = &options->address_family; |
748 | if (options->listen_addrs != NULL) | |
749 | fatal("%s line %d: address family must be specified before " | |
750 | "ListenAddress.", filename, linenum); | |
751 | if (strcasecmp(arg, "inet") == 0) | |
752 | value = AF_INET; | |
753 | else if (strcasecmp(arg, "inet6") == 0) | |
754 | value = AF_INET6; | |
755 | else if (strcasecmp(arg, "any") == 0) | |
756 | value = AF_UNSPEC; | |
757 | else | |
758 | fatal("%s line %d: unsupported address family \"%s\".", | |
759 | filename, linenum, arg); | |
760 | if (*intptr == -1) | |
761 | *intptr = value; | |
762 | break; | |
763 | ||
2717fa0f | 764 | case sHostKeyFile: |
765 | intptr = &options->num_host_key_files; | |
766 | if (*intptr >= MAX_HOSTKEYS) | |
767 | fatal("%s line %d: too many host keys specified (max %d).", | |
768 | filename, linenum, MAX_HOSTKEYS); | |
769 | charptr = &options->host_key_files[*intptr]; | |
fa649821 | 770 | parse_filename: |
2717fa0f | 771 | arg = strdelim(&cp); |
772 | if (!arg || *arg == '\0') | |
773 | fatal("%s line %d: missing file name.", | |
774 | filename, linenum); | |
d231781a | 775 | if (*activep && *charptr == NULL) { |
2717fa0f | 776 | *charptr = tilde_expand_filename(arg, getuid()); |
777 | /* increase optional counter */ | |
778 | if (intptr != NULL) | |
779 | *intptr = *intptr + 1; | |
780 | } | |
781 | break; | |
0fbe8c74 | 782 | |
2717fa0f | 783 | case sPidFile: |
784 | charptr = &options->pid_file; | |
785 | goto parse_filename; | |
5260325f | 786 | |
2717fa0f | 787 | case sPermitRootLogin: |
788 | intptr = &options->permit_root_login; | |
789 | arg = strdelim(&cp); | |
790 | if (!arg || *arg == '\0') | |
791 | fatal("%s line %d: missing yes/" | |
792 | "without-password/forced-commands-only/no " | |
793 | "argument.", filename, linenum); | |
794 | value = 0; /* silence compiler */ | |
795 | if (strcmp(arg, "without-password") == 0) | |
796 | value = PERMIT_NO_PASSWD; | |
797 | else if (strcmp(arg, "forced-commands-only") == 0) | |
798 | value = PERMIT_FORCED_ONLY; | |
799 | else if (strcmp(arg, "yes") == 0) | |
800 | value = PERMIT_YES; | |
801 | else if (strcmp(arg, "no") == 0) | |
802 | value = PERMIT_NO; | |
803 | else | |
804 | fatal("%s line %d: Bad yes/" | |
805 | "without-password/forced-commands-only/no " | |
806 | "argument: %s", filename, linenum, arg); | |
807 | if (*intptr == -1) | |
808 | *intptr = value; | |
809 | break; | |
810 | ||
811 | case sIgnoreRhosts: | |
812 | intptr = &options->ignore_rhosts; | |
5260325f | 813 | parse_flag: |
2717fa0f | 814 | arg = strdelim(&cp); |
815 | if (!arg || *arg == '\0') | |
816 | fatal("%s line %d: missing yes/no argument.", | |
817 | filename, linenum); | |
818 | value = 0; /* silence compiler */ | |
819 | if (strcmp(arg, "yes") == 0) | |
820 | value = 1; | |
821 | else if (strcmp(arg, "no") == 0) | |
822 | value = 0; | |
823 | else | |
824 | fatal("%s line %d: Bad yes/no argument: %s", | |
825 | filename, linenum, arg); | |
d231781a | 826 | if (*activep && *intptr == -1) |
2717fa0f | 827 | *intptr = value; |
828 | break; | |
829 | ||
830 | case sIgnoreUserKnownHosts: | |
831 | intptr = &options->ignore_user_known_hosts; | |
832 | goto parse_flag; | |
833 | ||
2717fa0f | 834 | case sRhostsRSAAuthentication: |
835 | intptr = &options->rhosts_rsa_authentication; | |
836 | goto parse_flag; | |
837 | ||
838 | case sHostbasedAuthentication: | |
839 | intptr = &options->hostbased_authentication; | |
840 | goto parse_flag; | |
841 | ||
842 | case sHostbasedUsesNameFromPacketOnly: | |
843 | intptr = &options->hostbased_uses_name_from_packet_only; | |
844 | goto parse_flag; | |
845 | ||
846 | case sRSAAuthentication: | |
847 | intptr = &options->rsa_authentication; | |
848 | goto parse_flag; | |
849 | ||
850 | case sPubkeyAuthentication: | |
851 | intptr = &options->pubkey_authentication; | |
852 | goto parse_flag; | |
d0ec7f42 | 853 | |
2717fa0f | 854 | case sKerberosAuthentication: |
855 | intptr = &options->kerberos_authentication; | |
856 | goto parse_flag; | |
5260325f | 857 | |
2717fa0f | 858 | case sKerberosOrLocalPasswd: |
859 | intptr = &options->kerberos_or_local_passwd; | |
860 | goto parse_flag; | |
5260325f | 861 | |
2717fa0f | 862 | case sKerberosTicketCleanup: |
863 | intptr = &options->kerberos_ticket_cleanup; | |
864 | goto parse_flag; | |
d0ec7f42 | 865 | |
a1e30b47 | 866 | case sKerberosGetAFSToken: |
867 | intptr = &options->kerberos_get_afs_token; | |
868 | goto parse_flag; | |
869 | ||
7364bd04 | 870 | case sGssAuthentication: |
871 | intptr = &options->gss_authentication; | |
872 | goto parse_flag; | |
873 | ||
874 | case sGssCleanupCreds: | |
875 | intptr = &options->gss_cleanup_creds; | |
876 | goto parse_flag; | |
877 | ||
2717fa0f | 878 | case sPasswordAuthentication: |
879 | intptr = &options->password_authentication; | |
880 | goto parse_flag; | |
5260325f | 881 | |
2717fa0f | 882 | case sKbdInteractiveAuthentication: |
883 | intptr = &options->kbd_interactive_authentication; | |
884 | goto parse_flag; | |
8002af61 | 885 | |
2717fa0f | 886 | case sChallengeResponseAuthentication: |
887 | intptr = &options->challenge_response_authentication; | |
888 | goto parse_flag; | |
8002af61 | 889 | |
2717fa0f | 890 | case sPrintMotd: |
891 | intptr = &options->print_motd; | |
892 | goto parse_flag; | |
5260325f | 893 | |
2717fa0f | 894 | case sPrintLastLog: |
895 | intptr = &options->print_lastlog; | |
896 | goto parse_flag; | |
5260325f | 897 | |
2717fa0f | 898 | case sX11Forwarding: |
899 | intptr = &options->x11_forwarding; | |
900 | goto parse_flag; | |
5260325f | 901 | |
2717fa0f | 902 | case sX11DisplayOffset: |
903 | intptr = &options->x11_display_offset; | |
904 | goto parse_int; | |
8efc0c15 | 905 | |
e6e573bd | 906 | case sX11UseLocalhost: |
907 | intptr = &options->x11_use_localhost; | |
908 | goto parse_flag; | |
909 | ||
2717fa0f | 910 | case sXAuthLocation: |
911 | charptr = &options->xauth_location; | |
912 | goto parse_filename; | |
5260325f | 913 | |
2717fa0f | 914 | case sStrictModes: |
915 | intptr = &options->strict_modes; | |
916 | goto parse_flag; | |
5260325f | 917 | |
fd573618 | 918 | case sTCPKeepAlive: |
919 | intptr = &options->tcp_keep_alive; | |
2717fa0f | 920 | goto parse_flag; |
33de75a3 | 921 | |
2717fa0f | 922 | case sEmptyPasswd: |
923 | intptr = &options->permit_empty_passwd; | |
924 | goto parse_flag; | |
5260325f | 925 | |
f00bab84 | 926 | case sPermitUserEnvironment: |
927 | intptr = &options->permit_user_env; | |
928 | goto parse_flag; | |
929 | ||
2717fa0f | 930 | case sUseLogin: |
931 | intptr = &options->use_login; | |
932 | goto parse_flag; | |
5260325f | 933 | |
636f76ca | 934 | case sCompression: |
935 | intptr = &options->compression; | |
07200973 | 936 | arg = strdelim(&cp); |
937 | if (!arg || *arg == '\0') | |
938 | fatal("%s line %d: missing yes/no/delayed " | |
939 | "argument.", filename, linenum); | |
940 | value = 0; /* silence compiler */ | |
941 | if (strcmp(arg, "delayed") == 0) | |
942 | value = COMP_DELAYED; | |
943 | else if (strcmp(arg, "yes") == 0) | |
944 | value = COMP_ZLIB; | |
945 | else if (strcmp(arg, "no") == 0) | |
946 | value = COMP_NONE; | |
947 | else | |
948 | fatal("%s line %d: Bad yes/no/delayed " | |
949 | "argument: %s", filename, linenum, arg); | |
950 | if (*intptr == -1) | |
951 | *intptr = value; | |
952 | break; | |
636f76ca | 953 | |
2717fa0f | 954 | case sGatewayPorts: |
955 | intptr = &options->gateway_ports; | |
3867aa0a | 956 | arg = strdelim(&cp); |
957 | if (!arg || *arg == '\0') | |
958 | fatal("%s line %d: missing yes/no/clientspecified " | |
959 | "argument.", filename, linenum); | |
960 | value = 0; /* silence compiler */ | |
961 | if (strcmp(arg, "clientspecified") == 0) | |
962 | value = 2; | |
963 | else if (strcmp(arg, "yes") == 0) | |
964 | value = 1; | |
965 | else if (strcmp(arg, "no") == 0) | |
966 | value = 0; | |
967 | else | |
968 | fatal("%s line %d: Bad yes/no/clientspecified " | |
969 | "argument: %s", filename, linenum, arg); | |
f3e3d6ce | 970 | if (*activep && *intptr == -1) |
3867aa0a | 971 | *intptr = value; |
972 | break; | |
5260325f | 973 | |
c5a7d788 | 974 | case sUseDNS: |
975 | intptr = &options->use_dns; | |
2717fa0f | 976 | goto parse_flag; |
5260325f | 977 | |
2717fa0f | 978 | case sLogFacility: |
979 | intptr = (int *) &options->log_facility; | |
980 | arg = strdelim(&cp); | |
981 | value = log_facility_number(arg); | |
5eaf8578 | 982 | if (value == SYSLOG_FACILITY_NOT_SET) |
2717fa0f | 983 | fatal("%.200s line %d: unsupported log facility '%s'", |
984 | filename, linenum, arg ? arg : "<NONE>"); | |
985 | if (*intptr == -1) | |
986 | *intptr = (SyslogFacility) value; | |
987 | break; | |
988 | ||
989 | case sLogLevel: | |
990 | intptr = (int *) &options->log_level; | |
991 | arg = strdelim(&cp); | |
992 | value = log_level_number(arg); | |
5eaf8578 | 993 | if (value == SYSLOG_LEVEL_NOT_SET) |
2717fa0f | 994 | fatal("%.200s line %d: unsupported log level '%s'", |
995 | filename, linenum, arg ? arg : "<NONE>"); | |
996 | if (*intptr == -1) | |
997 | *intptr = (LogLevel) value; | |
998 | break; | |
999 | ||
1000 | case sAllowTcpForwarding: | |
1001 | intptr = &options->allow_tcp_forwarding; | |
1002 | goto parse_flag; | |
1003 | ||
1853d1ef | 1004 | case sUsePrivilegeSeparation: |
1005 | intptr = &use_privsep; | |
1006 | goto parse_flag; | |
1007 | ||
2717fa0f | 1008 | case sAllowUsers: |
1009 | while ((arg = strdelim(&cp)) && *arg != '\0') { | |
1010 | if (options->num_allow_users >= MAX_ALLOW_USERS) | |
1011 | fatal("%s line %d: too many allow users.", | |
1012 | filename, linenum); | |
7528d467 | 1013 | options->allow_users[options->num_allow_users++] = |
1014 | xstrdup(arg); | |
2717fa0f | 1015 | } |
1016 | break; | |
a8be9f80 | 1017 | |
2717fa0f | 1018 | case sDenyUsers: |
1019 | while ((arg = strdelim(&cp)) && *arg != '\0') { | |
1020 | if (options->num_deny_users >= MAX_DENY_USERS) | |
d4f40d92 | 1021 | fatal("%s line %d: too many deny users.", |
2717fa0f | 1022 | filename, linenum); |
7528d467 | 1023 | options->deny_users[options->num_deny_users++] = |
1024 | xstrdup(arg); | |
2717fa0f | 1025 | } |
1026 | break; | |
b2552997 | 1027 | |
2717fa0f | 1028 | case sAllowGroups: |
1029 | while ((arg = strdelim(&cp)) && *arg != '\0') { | |
1030 | if (options->num_allow_groups >= MAX_ALLOW_GROUPS) | |
1031 | fatal("%s line %d: too many allow groups.", | |
1032 | filename, linenum); | |
7528d467 | 1033 | options->allow_groups[options->num_allow_groups++] = |
1034 | xstrdup(arg); | |
2717fa0f | 1035 | } |
1036 | break; | |
a8be9f80 | 1037 | |
2717fa0f | 1038 | case sDenyGroups: |
1039 | while ((arg = strdelim(&cp)) && *arg != '\0') { | |
1040 | if (options->num_deny_groups >= MAX_DENY_GROUPS) | |
1041 | fatal("%s line %d: too many deny groups.", | |
1042 | filename, linenum); | |
1043 | options->deny_groups[options->num_deny_groups++] = xstrdup(arg); | |
1044 | } | |
1045 | break; | |
38c295d6 | 1046 | |
2717fa0f | 1047 | case sCiphers: |
1048 | arg = strdelim(&cp); | |
1049 | if (!arg || *arg == '\0') | |
1050 | fatal("%s line %d: Missing argument.", filename, linenum); | |
1051 | if (!ciphers_valid(arg)) | |
1052 | fatal("%s line %d: Bad SSH2 cipher spec '%s'.", | |
1053 | filename, linenum, arg ? arg : "<NONE>"); | |
1054 | if (options->ciphers == NULL) | |
1055 | options->ciphers = xstrdup(arg); | |
1056 | break; | |
1057 | ||
1058 | case sMacs: | |
1059 | arg = strdelim(&cp); | |
1060 | if (!arg || *arg == '\0') | |
1061 | fatal("%s line %d: Missing argument.", filename, linenum); | |
1062 | if (!mac_valid(arg)) | |
1063 | fatal("%s line %d: Bad SSH2 mac spec '%s'.", | |
1064 | filename, linenum, arg ? arg : "<NONE>"); | |
1065 | if (options->macs == NULL) | |
1066 | options->macs = xstrdup(arg); | |
1067 | break; | |
1068 | ||
1069 | case sProtocol: | |
1070 | intptr = &options->protocol; | |
1071 | arg = strdelim(&cp); | |
1072 | if (!arg || *arg == '\0') | |
1073 | fatal("%s line %d: Missing argument.", filename, linenum); | |
1074 | value = proto_spec(arg); | |
1075 | if (value == SSH_PROTO_UNKNOWN) | |
1076 | fatal("%s line %d: Bad protocol spec '%s'.", | |
184eed6a | 1077 | filename, linenum, arg ? arg : "<NONE>"); |
2717fa0f | 1078 | if (*intptr == SSH_PROTO_UNKNOWN) |
1079 | *intptr = value; | |
1080 | break; | |
1081 | ||
1082 | case sSubsystem: | |
1083 | if (options->num_subsystems >= MAX_SUBSYSTEMS) { | |
1084 | fatal("%s line %d: too many subsystems defined.", | |
184eed6a | 1085 | filename, linenum); |
2717fa0f | 1086 | } |
1087 | arg = strdelim(&cp); | |
1088 | if (!arg || *arg == '\0') | |
1089 | fatal("%s line %d: Missing subsystem name.", | |
184eed6a | 1090 | filename, linenum); |
d231781a | 1091 | if (!*activep) { |
1092 | arg = strdelim(&cp); | |
1093 | break; | |
1094 | } | |
2717fa0f | 1095 | for (i = 0; i < options->num_subsystems; i++) |
1096 | if (strcmp(arg, options->subsystem_name[i]) == 0) | |
1097 | fatal("%s line %d: Subsystem '%s' already defined.", | |
184eed6a | 1098 | filename, linenum, arg); |
2717fa0f | 1099 | options->subsystem_name[options->num_subsystems] = xstrdup(arg); |
1100 | arg = strdelim(&cp); | |
1101 | if (!arg || *arg == '\0') | |
1102 | fatal("%s line %d: Missing subsystem command.", | |
184eed6a | 1103 | filename, linenum); |
2717fa0f | 1104 | options->subsystem_command[options->num_subsystems] = xstrdup(arg); |
d66ce1a1 | 1105 | |
1106 | /* Collect arguments (separate to executable) */ | |
1107 | p = xstrdup(arg); | |
1108 | len = strlen(p) + 1; | |
1109 | while ((arg = strdelim(&cp)) != NULL && *arg != '\0') { | |
1110 | len += 1 + strlen(arg); | |
1111 | p = xrealloc(p, 1, len); | |
1112 | strlcat(p, " ", len); | |
1113 | strlcat(p, arg, len); | |
1114 | } | |
1115 | options->subsystem_args[options->num_subsystems] = p; | |
2717fa0f | 1116 | options->num_subsystems++; |
1117 | break; | |
1118 | ||
1119 | case sMaxStartups: | |
1120 | arg = strdelim(&cp); | |
1121 | if (!arg || *arg == '\0') | |
1122 | fatal("%s line %d: Missing MaxStartups spec.", | |
184eed6a | 1123 | filename, linenum); |
2717fa0f | 1124 | if ((n = sscanf(arg, "%d:%d:%d", |
1125 | &options->max_startups_begin, | |
1126 | &options->max_startups_rate, | |
1127 | &options->max_startups)) == 3) { | |
1128 | if (options->max_startups_begin > | |
1129 | options->max_startups || | |
1130 | options->max_startups_rate > 100 || | |
1131 | options->max_startups_rate < 1) | |
c345cf9d | 1132 | fatal("%s line %d: Illegal MaxStartups spec.", |
97de229c | 1133 | filename, linenum); |
2717fa0f | 1134 | } else if (n != 1) |
1135 | fatal("%s line %d: Illegal MaxStartups spec.", | |
1136 | filename, linenum); | |
1137 | else | |
1138 | options->max_startups = options->max_startups_begin; | |
1139 | break; | |
1140 | ||
af4bd935 | 1141 | case sMaxAuthTries: |
1142 | intptr = &options->max_authtries; | |
1143 | goto parse_int; | |
1144 | ||
2717fa0f | 1145 | case sBanner: |
1146 | charptr = &options->banner; | |
1147 | goto parse_filename; | |
1148 | /* | |
1149 | * These options can contain %X options expanded at | |
1150 | * connect time, so that you can specify paths like: | |
1151 | * | |
1152 | * AuthorizedKeysFile /etc/ssh_keys/%u | |
1153 | */ | |
1154 | case sAuthorizedKeysFile: | |
1155 | case sAuthorizedKeysFile2: | |
d4f40d92 | 1156 | charptr = (opcode == sAuthorizedKeysFile) ? |
2717fa0f | 1157 | &options->authorized_keys_file : |
1158 | &options->authorized_keys_file2; | |
1159 | goto parse_filename; | |
1160 | ||
1161 | case sClientAliveInterval: | |
1162 | intptr = &options->client_alive_interval; | |
1163 | goto parse_time; | |
1164 | ||
1165 | case sClientAliveCountMax: | |
1166 | intptr = &options->client_alive_count_max; | |
1167 | goto parse_int; | |
1168 | ||
61a2c1da | 1169 | case sAcceptEnv: |
1170 | while ((arg = strdelim(&cp)) && *arg != '\0') { | |
1171 | if (strchr(arg, '=') != NULL) | |
1172 | fatal("%s line %d: Invalid environment name.", | |
1173 | filename, linenum); | |
1174 | if (options->num_accept_env >= MAX_ACCEPT_ENV) | |
1175 | fatal("%s line %d: too many allow env.", | |
1176 | filename, linenum); | |
d231781a | 1177 | if (!*activep) |
1178 | break; | |
61a2c1da | 1179 | options->accept_env[options->num_accept_env++] = |
1180 | xstrdup(arg); | |
1181 | } | |
1182 | break; | |
1183 | ||
d20f3c9e | 1184 | case sPermitTunnel: |
1185 | intptr = &options->permit_tun; | |
a4f24bf8 | 1186 | arg = strdelim(&cp); |
1187 | if (!arg || *arg == '\0') | |
1188 | fatal("%s line %d: Missing yes/point-to-point/" | |
1189 | "ethernet/no argument.", filename, linenum); | |
1190 | value = 0; /* silence compiler */ | |
1191 | if (strcasecmp(arg, "ethernet") == 0) | |
1192 | value = SSH_TUNMODE_ETHERNET; | |
1193 | else if (strcasecmp(arg, "point-to-point") == 0) | |
1194 | value = SSH_TUNMODE_POINTOPOINT; | |
1195 | else if (strcasecmp(arg, "yes") == 0) | |
1196 | value = SSH_TUNMODE_YES; | |
1197 | else if (strcasecmp(arg, "no") == 0) | |
1198 | value = SSH_TUNMODE_NO; | |
1199 | else | |
1200 | fatal("%s line %d: Bad yes/point-to-point/ethernet/" | |
1201 | "no argument: %s", filename, linenum, arg); | |
1202 | if (*intptr == -1) | |
1203 | *intptr = value; | |
1204 | break; | |
d20f3c9e | 1205 | |
d231781a | 1206 | case sMatch: |
1207 | if (cmdline) | |
1208 | fatal("Match directive not supported as a command-line " | |
1209 | "option"); | |
1210 | value = match_cfg_line(&cp, linenum, user, host, address); | |
1211 | if (value < 0) | |
1212 | fatal("%s line %d: Bad Match condition", filename, | |
1213 | linenum); | |
1214 | *activep = value; | |
1215 | break; | |
1216 | ||
2fefbadf | 1217 | case sPermitOpen: |
1218 | arg = strdelim(&cp); | |
1219 | if (!arg || *arg == '\0') | |
1220 | fatal("%s line %d: missing PermitOpen specification", | |
1221 | filename, linenum); | |
38757197 | 1222 | n = options->num_permitted_opens; /* modified later */ |
2fefbadf | 1223 | if (strcmp(arg, "any") == 0) { |
38757197 | 1224 | if (*activep && n == -1) { |
2fefbadf | 1225 | channel_clear_adm_permitted_opens(); |
ea46e550 | 1226 | options->num_permitted_opens = 0; |
1227 | } | |
2fefbadf | 1228 | break; |
1229 | } | |
75b6d52c | 1230 | if (*activep && n == -1) |
1231 | channel_clear_adm_permitted_opens(); | |
ea46e550 | 1232 | for (; arg != NULL && *arg != '\0'; arg = strdelim(&cp)) { |
1233 | p = hpdelim(&arg); | |
1234 | if (p == NULL) | |
1235 | fatal("%s line %d: missing host in PermitOpen", | |
1236 | filename, linenum); | |
1237 | p = cleanhostname(p); | |
1238 | if (arg == NULL || (port = a2port(arg)) == 0) | |
1239 | fatal("%s line %d: bad port number in " | |
1240 | "PermitOpen", filename, linenum); | |
75b6d52c | 1241 | if (*activep && n == -1) |
ea46e550 | 1242 | options->num_permitted_opens = |
1243 | channel_add_adm_permitted_opens(p, port); | |
ea46e550 | 1244 | } |
2fefbadf | 1245 | break; |
1246 | ||
e7259e8d | 1247 | case sForceCommand: |
1248 | if (cp == NULL) | |
1249 | fatal("%.200s line %d: Missing argument.", filename, | |
1250 | linenum); | |
1251 | len = strspn(cp, WHITESPACE); | |
1252 | if (*activep && options->adm_forced_command == NULL) | |
1253 | options->adm_forced_command = xstrdup(cp + len); | |
1254 | return 0; | |
1255 | ||
2717fa0f | 1256 | case sDeprecated: |
bbe88b6d | 1257 | logit("%s line %d: Deprecated option %s", |
2717fa0f | 1258 | filename, linenum, arg); |
1259 | while (arg) | |
1260 | arg = strdelim(&cp); | |
1261 | break; | |
1262 | ||
a2144546 | 1263 | case sUnsupported: |
1264 | logit("%s line %d: Unsupported option %s", | |
1265 | filename, linenum, arg); | |
1266 | while (arg) | |
1267 | arg = strdelim(&cp); | |
1268 | break; | |
1269 | ||
2717fa0f | 1270 | default: |
1271 | fatal("%s line %d: Missing handler for opcode %s (%d)", | |
1272 | filename, linenum, arg, opcode); | |
1273 | } | |
1274 | if ((arg = strdelim(&cp)) != NULL && *arg != '\0') | |
1275 | fatal("%s line %d: garbage at end of line; \"%.200s\".", | |
1276 | filename, linenum, arg); | |
1277 | return 0; | |
1278 | } | |
089fbbd2 | 1279 | |
2717fa0f | 1280 | /* Reads the server configuration file. */ |
5c53a31e | 1281 | |
2717fa0f | 1282 | void |
b9a549d7 | 1283 | load_server_config(const char *filename, Buffer *conf) |
2717fa0f | 1284 | { |
b9a549d7 | 1285 | char line[1024], *cp; |
7528d467 | 1286 | FILE *f; |
2717fa0f | 1287 | |
b9a549d7 | 1288 | debug2("%s: filename %s", __func__, filename); |
1289 | if ((f = fopen(filename, "r")) == NULL) { | |
2717fa0f | 1290 | perror(filename); |
1291 | exit(1); | |
1292 | } | |
b9a549d7 | 1293 | buffer_clear(conf); |
2717fa0f | 1294 | while (fgets(line, sizeof(line), f)) { |
b9a549d7 | 1295 | /* |
1296 | * Trim out comments and strip whitespace | |
f2107e97 | 1297 | * NB - preserve newlines, they are needed to reproduce |
b9a549d7 | 1298 | * line numbers later for error messages |
1299 | */ | |
1300 | if ((cp = strchr(line, '#')) != NULL) | |
1301 | memcpy(cp, "\n", 2); | |
1302 | cp = line + strspn(line, " \t\r"); | |
1303 | ||
1304 | buffer_append(conf, cp, strlen(cp)); | |
8efc0c15 | 1305 | } |
b9a549d7 | 1306 | buffer_append(conf, "\0", 1); |
5260325f | 1307 | fclose(f); |
b9a549d7 | 1308 | debug2("%s: done config len = %d", __func__, buffer_len(conf)); |
1309 | } | |
1310 | ||
1311 | void | |
d231781a | 1312 | parse_server_match_config(ServerOptions *options, const char *user, |
1313 | const char *host, const char *address) | |
1314 | { | |
1315 | ServerOptions mo; | |
1316 | ||
1317 | initialize_server_options(&mo); | |
1318 | parse_server_config(&mo, "reprocess config", &cfg, user, host, address); | |
03bcbf84 | 1319 | copy_set_server_options(options, &mo, 0); |
d231781a | 1320 | } |
1321 | ||
03bcbf84 | 1322 | /* Helper macros */ |
1323 | #define M_CP_INTOPT(n) do {\ | |
1324 | if (src->n != -1) \ | |
1325 | dst->n = src->n; \ | |
1326 | } while (0) | |
1327 | #define M_CP_STROPT(n) do {\ | |
1328 | if (src->n != NULL) { \ | |
1329 | if (dst->n != NULL) \ | |
1330 | xfree(dst->n); \ | |
1331 | dst->n = src->n; \ | |
1332 | } \ | |
1333 | } while(0) | |
1334 | ||
1335 | /* | |
1336 | * Copy any supported values that are set. | |
1337 | * | |
1338 | * If the preauth flag is set, we do not bother copying the the string or | |
1339 | * array values that are not used pre-authentication, because any that we | |
1340 | * do use must be explictly sent in mm_getpwnamallow(). | |
1341 | */ | |
d231781a | 1342 | void |
03bcbf84 | 1343 | copy_set_server_options(ServerOptions *dst, ServerOptions *src, int preauth) |
d231781a | 1344 | { |
03bcbf84 | 1345 | M_CP_INTOPT(password_authentication); |
1346 | M_CP_INTOPT(gss_authentication); | |
1347 | M_CP_INTOPT(rsa_authentication); | |
1348 | M_CP_INTOPT(pubkey_authentication); | |
1349 | M_CP_INTOPT(kerberos_authentication); | |
1350 | M_CP_INTOPT(hostbased_authentication); | |
1351 | M_CP_INTOPT(kbd_interactive_authentication); | |
03bcbf84 | 1352 | |
1353 | M_CP_INTOPT(allow_tcp_forwarding); | |
1354 | M_CP_INTOPT(gateway_ports); | |
1355 | M_CP_INTOPT(x11_display_offset); | |
1356 | M_CP_INTOPT(x11_forwarding); | |
1357 | M_CP_INTOPT(x11_use_localhost); | |
1358 | ||
1359 | M_CP_STROPT(banner); | |
1360 | if (preauth) | |
1361 | return; | |
1362 | M_CP_STROPT(adm_forced_command); | |
d231781a | 1363 | } |
1364 | ||
03bcbf84 | 1365 | #undef M_CP_INTOPT |
1366 | #undef M_CP_STROPT | |
1367 | ||
d231781a | 1368 | void |
1369 | parse_server_config(ServerOptions *options, const char *filename, Buffer *conf, | |
1370 | const char *user, const char *host, const char *address) | |
b9a549d7 | 1371 | { |
d231781a | 1372 | int active, linenum, bad_options = 0; |
16acb158 | 1373 | char *cp, *obuf, *cbuf; |
b9a549d7 | 1374 | |
1375 | debug2("%s: config %s len %d", __func__, filename, buffer_len(conf)); | |
1376 | ||
16acb158 | 1377 | obuf = cbuf = xstrdup(buffer_ptr(conf)); |
d231781a | 1378 | active = user ? 0 : 1; |
861cc543 | 1379 | linenum = 1; |
f8cc7664 | 1380 | while ((cp = strsep(&cbuf, "\n")) != NULL) { |
b9a549d7 | 1381 | if (process_server_config_line(options, cp, filename, |
d231781a | 1382 | linenum++, &active, user, host, address) != 0) |
b9a549d7 | 1383 | bad_options++; |
1384 | } | |
16acb158 | 1385 | xfree(obuf); |
b7c70970 | 1386 | if (bad_options > 0) |
1387 | fatal("%s: terminating, %d bad configuration options", | |
1388 | filename, bad_options); | |
8efc0c15 | 1389 | } |