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31652869 | 1 | /* $OpenBSD: servconf.c,v 1.164 2006/08/03 03:34:42 deraadt 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> |
cf851879 | 19 | #include <stdio.h> |
ffa517a8 | 20 | #include <stdlib.h> |
00146caa | 21 | #include <string.h> |
31652869 | 22 | #include <signal.h> |
5188ba17 | 23 | #include <unistd.h> |
31652869 | 24 | #include <stdarg.h> |
c8dfff33 | 25 | |
31652869 | 26 | #include "xmalloc.h" |
8efc0c15 | 27 | #include "ssh.h" |
42f11eb2 | 28 | #include "log.h" |
31652869 | 29 | #include "buffer.h" |
8efc0c15 | 30 | #include "servconf.h" |
a8be9f80 | 31 | #include "compat.h" |
42f11eb2 | 32 | #include "pathnames.h" |
42f11eb2 | 33 | #include "misc.h" |
34 | #include "cipher.h" | |
31652869 | 35 | #include "key.h" |
b2552997 | 36 | #include "kex.h" |
37 | #include "mac.h" | |
d231781a | 38 | #include "match.h" |
2fefbadf | 39 | #include "channels.h" |
42f11eb2 | 40 | |
396c147e | 41 | static void add_listen_addr(ServerOptions *, char *, u_short); |
42 | static void add_one_listen_addr(ServerOptions *, char *, u_short); | |
48e671d5 | 43 | |
1853d1ef | 44 | /* Use of privilege separation or not */ |
45 | extern int use_privsep; | |
d231781a | 46 | extern Buffer cfg; |
42f11eb2 | 47 | |
8efc0c15 | 48 | /* Initializes the server options to their default values. */ |
49 | ||
6ae2364d | 50 | void |
5260325f | 51 | initialize_server_options(ServerOptions *options) |
8efc0c15 | 52 | { |
5260325f | 53 | memset(options, 0, sizeof(*options)); |
e15895cd | 54 | |
55 | /* Portable-specific options */ | |
7fceb20d | 56 | options->use_pam = -1; |
e15895cd | 57 | |
58 | /* Standard Options */ | |
48e671d5 | 59 | options->num_ports = 0; |
60 | options->ports_from_cmdline = 0; | |
61 | options->listen_addrs = NULL; | |
31b41ceb | 62 | options->address_family = -1; |
fa08c86b | 63 | options->num_host_key_files = 0; |
0fbe8c74 | 64 | options->pid_file = NULL; |
5260325f | 65 | options->server_key_bits = -1; |
66 | options->login_grace_time = -1; | |
67 | options->key_regeneration_time = -1; | |
15853e93 | 68 | options->permit_root_login = PERMIT_NOT_SET; |
5260325f | 69 | options->ignore_rhosts = -1; |
70 | options->ignore_user_known_hosts = -1; | |
71 | options->print_motd = -1; | |
4f4648f9 | 72 | options->print_lastlog = -1; |
5260325f | 73 | options->x11_forwarding = -1; |
74 | options->x11_display_offset = -1; | |
e6e573bd | 75 | options->x11_use_localhost = -1; |
fa649821 | 76 | options->xauth_location = NULL; |
5260325f | 77 | options->strict_modes = -1; |
fd573618 | 78 | options->tcp_keep_alive = -1; |
5eaf8578 | 79 | options->log_facility = SYSLOG_FACILITY_NOT_SET; |
80 | options->log_level = SYSLOG_LEVEL_NOT_SET; | |
5260325f | 81 | options->rhosts_rsa_authentication = -1; |
8002af61 | 82 | options->hostbased_authentication = -1; |
83 | options->hostbased_uses_name_from_packet_only = -1; | |
5260325f | 84 | options->rsa_authentication = -1; |
fa08c86b | 85 | options->pubkey_authentication = -1; |
5260325f | 86 | options->kerberos_authentication = -1; |
87 | options->kerberos_or_local_passwd = -1; | |
88 | options->kerberos_ticket_cleanup = -1; | |
a1e30b47 | 89 | options->kerberos_get_afs_token = -1; |
7364bd04 | 90 | options->gss_authentication=-1; |
91 | options->gss_cleanup_creds = -1; | |
5260325f | 92 | options->password_authentication = -1; |
94ec8c6b | 93 | options->kbd_interactive_authentication = -1; |
5ba55ada | 94 | options->challenge_response_authentication = -1; |
5260325f | 95 | options->permit_empty_passwd = -1; |
f00bab84 | 96 | options->permit_user_env = -1; |
5260325f | 97 | options->use_login = -1; |
636f76ca | 98 | options->compression = -1; |
33de75a3 | 99 | options->allow_tcp_forwarding = -1; |
5260325f | 100 | options->num_allow_users = 0; |
101 | options->num_deny_users = 0; | |
102 | options->num_allow_groups = 0; | |
103 | options->num_deny_groups = 0; | |
a8be9f80 | 104 | options->ciphers = NULL; |
b2552997 | 105 | options->macs = NULL; |
a8be9f80 | 106 | options->protocol = SSH_PROTO_UNKNOWN; |
1d1ffb87 | 107 | options->gateway_ports = -1; |
38c295d6 | 108 | options->num_subsystems = 0; |
c345cf9d | 109 | options->max_startups_begin = -1; |
110 | options->max_startups_rate = -1; | |
089fbbd2 | 111 | options->max_startups = -1; |
af4bd935 | 112 | options->max_authtries = -1; |
eea39c02 | 113 | options->banner = NULL; |
c5a7d788 | 114 | options->use_dns = -1; |
3ffc6336 | 115 | options->client_alive_interval = -1; |
116 | options->client_alive_count_max = -1; | |
c8445989 | 117 | options->authorized_keys_file = NULL; |
118 | options->authorized_keys_file2 = NULL; | |
61a2c1da | 119 | options->num_accept_env = 0; |
d20f3c9e | 120 | options->permit_tun = -1; |
ea46e550 | 121 | options->num_permitted_opens = -1; |
e7259e8d | 122 | options->adm_forced_command = NULL; |
8efc0c15 | 123 | } |
124 | ||
6ae2364d | 125 | void |
5260325f | 126 | fill_default_server_options(ServerOptions *options) |
8efc0c15 | 127 | { |
e15895cd | 128 | /* Portable-specific options */ |
7fceb20d | 129 | if (options->use_pam == -1) |
0a23d79f | 130 | options->use_pam = 0; |
e15895cd | 131 | |
132 | /* Standard Options */ | |
fa08c86b | 133 | if (options->protocol == SSH_PROTO_UNKNOWN) |
134 | options->protocol = SSH_PROTO_1|SSH_PROTO_2; | |
135 | if (options->num_host_key_files == 0) { | |
136 | /* fill default hostkeys for protocols */ | |
137 | if (options->protocol & SSH_PROTO_1) | |
0f84fe37 | 138 | options->host_key_files[options->num_host_key_files++] = |
139 | _PATH_HOST_KEY_FILE; | |
140 | if (options->protocol & SSH_PROTO_2) { | |
141 | options->host_key_files[options->num_host_key_files++] = | |
142 | _PATH_HOST_RSA_KEY_FILE; | |
143 | options->host_key_files[options->num_host_key_files++] = | |
144 | _PATH_HOST_DSA_KEY_FILE; | |
145 | } | |
fa08c86b | 146 | } |
48e671d5 | 147 | if (options->num_ports == 0) |
148 | options->ports[options->num_ports++] = SSH_DEFAULT_PORT; | |
149 | if (options->listen_addrs == NULL) | |
2d2a2c65 | 150 | add_listen_addr(options, NULL, 0); |
0fbe8c74 | 151 | if (options->pid_file == NULL) |
42f11eb2 | 152 | options->pid_file = _PATH_SSH_DAEMON_PID_FILE; |
5260325f | 153 | if (options->server_key_bits == -1) |
154 | options->server_key_bits = 768; | |
155 | if (options->login_grace_time == -1) | |
3445ca02 | 156 | options->login_grace_time = 120; |
5260325f | 157 | if (options->key_regeneration_time == -1) |
158 | options->key_regeneration_time = 3600; | |
15853e93 | 159 | if (options->permit_root_login == PERMIT_NOT_SET) |
160 | options->permit_root_login = PERMIT_YES; | |
5260325f | 161 | if (options->ignore_rhosts == -1) |
c8d54615 | 162 | options->ignore_rhosts = 1; |
5260325f | 163 | if (options->ignore_user_known_hosts == -1) |
164 | options->ignore_user_known_hosts = 0; | |
5260325f | 165 | if (options->print_motd == -1) |
166 | options->print_motd = 1; | |
4f4648f9 | 167 | if (options->print_lastlog == -1) |
168 | options->print_lastlog = 1; | |
5260325f | 169 | if (options->x11_forwarding == -1) |
c8d54615 | 170 | options->x11_forwarding = 0; |
5260325f | 171 | if (options->x11_display_offset == -1) |
c8d54615 | 172 | options->x11_display_offset = 10; |
e6e573bd | 173 | if (options->x11_use_localhost == -1) |
174 | options->x11_use_localhost = 1; | |
fa649821 | 175 | if (options->xauth_location == NULL) |
fd9ede94 | 176 | options->xauth_location = _PATH_XAUTH; |
5260325f | 177 | if (options->strict_modes == -1) |
178 | options->strict_modes = 1; | |
fd573618 | 179 | if (options->tcp_keep_alive == -1) |
180 | options->tcp_keep_alive = 1; | |
5eaf8578 | 181 | if (options->log_facility == SYSLOG_FACILITY_NOT_SET) |
5260325f | 182 | options->log_facility = SYSLOG_FACILITY_AUTH; |
5eaf8578 | 183 | if (options->log_level == SYSLOG_LEVEL_NOT_SET) |
59c97189 | 184 | options->log_level = SYSLOG_LEVEL_INFO; |
5260325f | 185 | if (options->rhosts_rsa_authentication == -1) |
c8d54615 | 186 | options->rhosts_rsa_authentication = 0; |
8002af61 | 187 | if (options->hostbased_authentication == -1) |
188 | options->hostbased_authentication = 0; | |
189 | if (options->hostbased_uses_name_from_packet_only == -1) | |
190 | options->hostbased_uses_name_from_packet_only = 0; | |
5260325f | 191 | if (options->rsa_authentication == -1) |
192 | options->rsa_authentication = 1; | |
fa08c86b | 193 | if (options->pubkey_authentication == -1) |
194 | options->pubkey_authentication = 1; | |
5260325f | 195 | if (options->kerberos_authentication == -1) |
eadc806d | 196 | options->kerberos_authentication = 0; |
5260325f | 197 | if (options->kerberos_or_local_passwd == -1) |
198 | options->kerberos_or_local_passwd = 1; | |
199 | if (options->kerberos_ticket_cleanup == -1) | |
200 | options->kerberos_ticket_cleanup = 1; | |
a1e30b47 | 201 | if (options->kerberos_get_afs_token == -1) |
202 | options->kerberos_get_afs_token = 0; | |
7364bd04 | 203 | if (options->gss_authentication == -1) |
204 | options->gss_authentication = 0; | |
205 | if (options->gss_cleanup_creds == -1) | |
206 | options->gss_cleanup_creds = 1; | |
5260325f | 207 | if (options->password_authentication == -1) |
208 | options->password_authentication = 1; | |
94ec8c6b | 209 | if (options->kbd_interactive_authentication == -1) |
210 | options->kbd_interactive_authentication = 0; | |
5ba55ada | 211 | if (options->challenge_response_authentication == -1) |
212 | options->challenge_response_authentication = 1; | |
5260325f | 213 | if (options->permit_empty_passwd == -1) |
c8d54615 | 214 | options->permit_empty_passwd = 0; |
f00bab84 | 215 | if (options->permit_user_env == -1) |
216 | options->permit_user_env = 0; | |
5260325f | 217 | if (options->use_login == -1) |
218 | options->use_login = 0; | |
636f76ca | 219 | if (options->compression == -1) |
07200973 | 220 | options->compression = COMP_DELAYED; |
33de75a3 | 221 | if (options->allow_tcp_forwarding == -1) |
222 | options->allow_tcp_forwarding = 1; | |
1d1ffb87 | 223 | if (options->gateway_ports == -1) |
224 | options->gateway_ports = 0; | |
089fbbd2 | 225 | if (options->max_startups == -1) |
226 | options->max_startups = 10; | |
c345cf9d | 227 | if (options->max_startups_rate == -1) |
228 | options->max_startups_rate = 100; /* 100% */ | |
229 | if (options->max_startups_begin == -1) | |
230 | options->max_startups_begin = options->max_startups; | |
af4bd935 | 231 | if (options->max_authtries == -1) |
232 | options->max_authtries = DEFAULT_AUTH_FAIL_MAX; | |
c5a7d788 | 233 | if (options->use_dns == -1) |
234 | options->use_dns = 1; | |
3ffc6336 | 235 | if (options->client_alive_interval == -1) |
184eed6a | 236 | options->client_alive_interval = 0; |
3ffc6336 | 237 | if (options->client_alive_count_max == -1) |
238 | options->client_alive_count_max = 3; | |
5df83e07 | 239 | if (options->authorized_keys_file2 == NULL) { |
240 | /* authorized_keys_file2 falls back to authorized_keys_file */ | |
241 | if (options->authorized_keys_file != NULL) | |
242 | options->authorized_keys_file2 = options->authorized_keys_file; | |
243 | else | |
244 | options->authorized_keys_file2 = _PATH_SSH_USER_PERMITTED_KEYS2; | |
245 | } | |
246 | if (options->authorized_keys_file == NULL) | |
247 | options->authorized_keys_file = _PATH_SSH_USER_PERMITTED_KEYS; | |
d20f3c9e | 248 | if (options->permit_tun == -1) |
a4f24bf8 | 249 | options->permit_tun = SSH_TUNMODE_NO; |
1853d1ef | 250 | |
2ee1b704 | 251 | /* Turn privilege separation on by default */ |
1853d1ef | 252 | if (use_privsep == -1) |
2ee1b704 | 253 | use_privsep = 1; |
e299a298 | 254 | |
4165b82e | 255 | #ifndef HAVE_MMAP |
e299a298 | 256 | if (use_privsep && options->compression == 1) { |
257 | error("This platform does not support both privilege " | |
258 | "separation and compression"); | |
259 | error("Compression disabled"); | |
260 | options->compression = 0; | |
261 | } | |
262 | #endif | |
263 | ||
8efc0c15 | 264 | } |
265 | ||
8efc0c15 | 266 | /* Keyword tokens. */ |
5260325f | 267 | typedef enum { |
268 | sBadOption, /* == unknown option */ | |
e15895cd | 269 | /* Portable-specific options */ |
7fceb20d | 270 | sUsePAM, |
e15895cd | 271 | /* Standard Options */ |
5260325f | 272 | sPort, sHostKeyFile, sServerKeyBits, sLoginGraceTime, sKeyRegenerationTime, |
273 | sPermitRootLogin, sLogFacility, sLogLevel, | |
0598d99d | 274 | sRhostsRSAAuthentication, sRSAAuthentication, |
5260325f | 275 | sKerberosAuthentication, sKerberosOrLocalPasswd, sKerberosTicketCleanup, |
a1e30b47 | 276 | sKerberosGetAFSToken, |
1c590258 | 277 | sKerberosTgtPassing, sChallengeResponseAuthentication, |
31b41ceb | 278 | sPasswordAuthentication, sKbdInteractiveAuthentication, |
279 | sListenAddress, sAddressFamily, | |
4f4648f9 | 280 | sPrintMotd, sPrintLastLog, sIgnoreRhosts, |
e6e573bd | 281 | sX11Forwarding, sX11DisplayOffset, sX11UseLocalhost, |
fd573618 | 282 | sStrictModes, sEmptyPasswd, sTCPKeepAlive, |
f00bab84 | 283 | sPermitUserEnvironment, sUseLogin, sAllowTcpForwarding, sCompression, |
33de75a3 | 284 | sAllowUsers, sDenyUsers, sAllowGroups, sDenyGroups, |
b2552997 | 285 | sIgnoreUserKnownHosts, sCiphers, sMacs, sProtocol, sPidFile, |
af4bd935 | 286 | sGatewayPorts, sPubkeyAuthentication, sXAuthLocation, sSubsystem, |
287 | sMaxStartups, sMaxAuthTries, | |
c5a7d788 | 288 | sBanner, sUseDNS, sHostbasedAuthentication, |
184eed6a | 289 | sHostbasedUsesNameFromPacketOnly, sClientAliveInterval, |
c8445989 | 290 | sClientAliveCountMax, sAuthorizedKeysFile, sAuthorizedKeysFile2, |
d20f3c9e | 291 | sGssAuthentication, sGssCleanupCreds, sAcceptEnv, sPermitTunnel, |
e7259e8d | 292 | sMatch, sPermitOpen, sForceCommand, |
2ea6de2b | 293 | sUsePrivilegeSeparation, |
a2144546 | 294 | sDeprecated, sUnsupported |
8efc0c15 | 295 | } ServerOpCodes; |
296 | ||
d231781a | 297 | #define SSHCFG_GLOBAL 0x01 /* allowed in main section of sshd_config */ |
298 | #define SSHCFG_MATCH 0x02 /* allowed inside a Match section */ | |
299 | #define SSHCFG_ALL (SSHCFG_GLOBAL|SSHCFG_MATCH) | |
300 | ||
8efc0c15 | 301 | /* Textual representation of the tokens. */ |
5260325f | 302 | static struct { |
303 | const char *name; | |
304 | ServerOpCodes opcode; | |
d231781a | 305 | u_int flags; |
5260325f | 306 | } keywords[] = { |
e15895cd | 307 | /* Portable-specific options */ |
b06b11ad | 308 | #ifdef USE_PAM |
d231781a | 309 | { "usepam", sUsePAM, SSHCFG_GLOBAL }, |
b06b11ad | 310 | #else |
d231781a | 311 | { "usepam", sUnsupported, SSHCFG_GLOBAL }, |
b06b11ad | 312 | #endif |
d231781a | 313 | { "pamauthenticationviakbdint", sDeprecated, SSHCFG_GLOBAL }, |
e15895cd | 314 | /* Standard Options */ |
d231781a | 315 | { "port", sPort, SSHCFG_GLOBAL }, |
316 | { "hostkey", sHostKeyFile, SSHCFG_GLOBAL }, | |
317 | { "hostdsakey", sHostKeyFile, SSHCFG_GLOBAL }, /* alias */ | |
318 | { "pidfile", sPidFile, SSHCFG_GLOBAL }, | |
319 | { "serverkeybits", sServerKeyBits, SSHCFG_GLOBAL }, | |
320 | { "logingracetime", sLoginGraceTime, SSHCFG_GLOBAL }, | |
321 | { "keyregenerationinterval", sKeyRegenerationTime, SSHCFG_GLOBAL }, | |
322 | { "permitrootlogin", sPermitRootLogin, SSHCFG_GLOBAL }, | |
323 | { "syslogfacility", sLogFacility, SSHCFG_GLOBAL }, | |
324 | { "loglevel", sLogLevel, SSHCFG_GLOBAL }, | |
325 | { "rhostsauthentication", sDeprecated, SSHCFG_GLOBAL }, | |
326 | { "rhostsrsaauthentication", sRhostsRSAAuthentication, SSHCFG_GLOBAL }, | |
327 | { "hostbasedauthentication", sHostbasedAuthentication, SSHCFG_GLOBAL }, | |
328 | { "hostbasedusesnamefrompacketonly", sHostbasedUsesNameFromPacketOnly, SSHCFG_GLOBAL }, | |
329 | { "rsaauthentication", sRSAAuthentication, SSHCFG_GLOBAL }, | |
330 | { "pubkeyauthentication", sPubkeyAuthentication, SSHCFG_GLOBAL }, | |
331 | { "dsaauthentication", sPubkeyAuthentication, SSHCFG_GLOBAL }, /* alias */ | |
1c590258 | 332 | #ifdef KRB5 |
d231781a | 333 | { "kerberosauthentication", sKerberosAuthentication, SSHCFG_GLOBAL }, |
334 | { "kerberosorlocalpasswd", sKerberosOrLocalPasswd, SSHCFG_GLOBAL }, | |
335 | { "kerberosticketcleanup", sKerberosTicketCleanup, SSHCFG_GLOBAL }, | |
bcfcc5f9 | 336 | #ifdef USE_AFS |
d231781a | 337 | { "kerberosgetafstoken", sKerberosGetAFSToken, SSHCFG_GLOBAL }, |
309af4e5 | 338 | #else |
d231781a | 339 | { "kerberosgetafstoken", sUnsupported, SSHCFG_GLOBAL }, |
309af4e5 | 340 | #endif |
a2144546 | 341 | #else |
d231781a | 342 | { "kerberosauthentication", sUnsupported, SSHCFG_GLOBAL }, |
343 | { "kerberosorlocalpasswd", sUnsupported, SSHCFG_GLOBAL }, | |
344 | { "kerberosticketcleanup", sUnsupported, SSHCFG_GLOBAL }, | |
345 | { "kerberosgetafstoken", sUnsupported, SSHCFG_GLOBAL }, | |
a2144546 | 346 | #endif |
d231781a | 347 | { "kerberostgtpassing", sUnsupported, SSHCFG_GLOBAL }, |
348 | { "afstokenpassing", sUnsupported, SSHCFG_GLOBAL }, | |
7364bd04 | 349 | #ifdef GSSAPI |
d231781a | 350 | { "gssapiauthentication", sGssAuthentication, SSHCFG_GLOBAL }, |
351 | { "gssapicleanupcredentials", sGssCleanupCreds, SSHCFG_GLOBAL }, | |
7364bd04 | 352 | #else |
d231781a | 353 | { "gssapiauthentication", sUnsupported, SSHCFG_GLOBAL }, |
354 | { "gssapicleanupcredentials", sUnsupported, SSHCFG_GLOBAL }, | |
7364bd04 | 355 | #endif |
d231781a | 356 | { "passwordauthentication", sPasswordAuthentication, SSHCFG_GLOBAL }, |
357 | { "kbdinteractiveauthentication", sKbdInteractiveAuthentication, SSHCFG_GLOBAL }, | |
358 | { "challengeresponseauthentication", sChallengeResponseAuthentication, SSHCFG_GLOBAL }, | |
359 | { "skeyauthentication", sChallengeResponseAuthentication, SSHCFG_GLOBAL }, /* alias */ | |
360 | { "checkmail", sDeprecated, SSHCFG_GLOBAL }, | |
361 | { "listenaddress", sListenAddress, SSHCFG_GLOBAL }, | |
362 | { "addressfamily", sAddressFamily, SSHCFG_GLOBAL }, | |
363 | { "printmotd", sPrintMotd, SSHCFG_GLOBAL }, | |
364 | { "printlastlog", sPrintLastLog, SSHCFG_GLOBAL }, | |
365 | { "ignorerhosts", sIgnoreRhosts, SSHCFG_GLOBAL }, | |
366 | { "ignoreuserknownhosts", sIgnoreUserKnownHosts, SSHCFG_GLOBAL }, | |
691712e0 | 367 | { "x11forwarding", sX11Forwarding, SSHCFG_ALL }, |
368 | { "x11displayoffset", sX11DisplayOffset, SSHCFG_ALL }, | |
369 | { "x11uselocalhost", sX11UseLocalhost, SSHCFG_ALL }, | |
d231781a | 370 | { "xauthlocation", sXAuthLocation, SSHCFG_GLOBAL }, |
371 | { "strictmodes", sStrictModes, SSHCFG_GLOBAL }, | |
372 | { "permitemptypasswords", sEmptyPasswd, SSHCFG_GLOBAL }, | |
373 | { "permituserenvironment", sPermitUserEnvironment, SSHCFG_GLOBAL }, | |
374 | { "uselogin", sUseLogin, SSHCFG_GLOBAL }, | |
375 | { "compression", sCompression, SSHCFG_GLOBAL }, | |
376 | { "tcpkeepalive", sTCPKeepAlive, SSHCFG_GLOBAL }, | |
377 | { "keepalive", sTCPKeepAlive, SSHCFG_GLOBAL }, /* obsolete alias */ | |
378 | { "allowtcpforwarding", sAllowTcpForwarding, SSHCFG_ALL }, | |
379 | { "allowusers", sAllowUsers, SSHCFG_GLOBAL }, | |
380 | { "denyusers", sDenyUsers, SSHCFG_GLOBAL }, | |
381 | { "allowgroups", sAllowGroups, SSHCFG_GLOBAL }, | |
382 | { "denygroups", sDenyGroups, SSHCFG_GLOBAL }, | |
383 | { "ciphers", sCiphers, SSHCFG_GLOBAL }, | |
384 | { "macs", sMacs, SSHCFG_GLOBAL }, | |
385 | { "protocol", sProtocol, SSHCFG_GLOBAL }, | |
386 | { "gatewayports", sGatewayPorts, SSHCFG_ALL }, | |
387 | { "subsystem", sSubsystem, SSHCFG_GLOBAL }, | |
388 | { "maxstartups", sMaxStartups, SSHCFG_GLOBAL }, | |
389 | { "maxauthtries", sMaxAuthTries, SSHCFG_GLOBAL }, | |
390 | { "banner", sBanner, SSHCFG_GLOBAL }, | |
391 | { "usedns", sUseDNS, SSHCFG_GLOBAL }, | |
392 | { "verifyreversemapping", sDeprecated, SSHCFG_GLOBAL }, | |
393 | { "reversemappingcheck", sDeprecated, SSHCFG_GLOBAL }, | |
394 | { "clientaliveinterval", sClientAliveInterval, SSHCFG_GLOBAL }, | |
395 | { "clientalivecountmax", sClientAliveCountMax, SSHCFG_GLOBAL }, | |
396 | { "authorizedkeysfile", sAuthorizedKeysFile, SSHCFG_GLOBAL }, | |
397 | { "authorizedkeysfile2", sAuthorizedKeysFile2, SSHCFG_GLOBAL }, | |
398 | { "useprivilegeseparation", sUsePrivilegeSeparation, SSHCFG_GLOBAL }, | |
399 | { "acceptenv", sAcceptEnv, SSHCFG_GLOBAL }, | |
400 | { "permittunnel", sPermitTunnel, SSHCFG_GLOBAL }, | |
2fefbadf | 401 | { "match", sMatch, SSHCFG_ALL }, |
402 | { "permitopen", sPermitOpen, SSHCFG_ALL }, | |
e7259e8d | 403 | { "forcecommand", sForceCommand, SSHCFG_ALL }, |
d231781a | 404 | { NULL, sBadOption, 0 } |
8efc0c15 | 405 | }; |
406 | ||
aa3378df | 407 | /* |
6be9a5e8 | 408 | * Returns the number of the token pointed to by cp or sBadOption. |
aa3378df | 409 | */ |
8efc0c15 | 410 | |
6ae2364d | 411 | static ServerOpCodes |
5260325f | 412 | parse_token(const char *cp, const char *filename, |
d231781a | 413 | int linenum, u_int *flags) |
8efc0c15 | 414 | { |
1e3b8b07 | 415 | u_int i; |
8efc0c15 | 416 | |
5260325f | 417 | for (i = 0; keywords[i].name; i++) |
d231781a | 418 | if (strcasecmp(cp, keywords[i].name) == 0) { |
419 | *flags = keywords[i].flags; | |
5260325f | 420 | return keywords[i].opcode; |
d231781a | 421 | } |
8efc0c15 | 422 | |
b7c70970 | 423 | error("%s: line %d: Bad configuration option: %s", |
424 | filename, linenum, cp); | |
5260325f | 425 | return sBadOption; |
8efc0c15 | 426 | } |
427 | ||
396c147e | 428 | static void |
2d2a2c65 | 429 | add_listen_addr(ServerOptions *options, char *addr, u_short port) |
48e671d5 | 430 | { |
2ceb8101 | 431 | u_int i; |
48e671d5 | 432 | |
433 | if (options->num_ports == 0) | |
434 | options->ports[options->num_ports++] = SSH_DEFAULT_PORT; | |
31b41ceb | 435 | if (options->address_family == -1) |
436 | options->address_family = AF_UNSPEC; | |
2d2a2c65 | 437 | if (port == 0) |
d11c1288 | 438 | for (i = 0; i < options->num_ports; i++) |
439 | add_one_listen_addr(options, addr, options->ports[i]); | |
440 | else | |
2d2a2c65 | 441 | add_one_listen_addr(options, addr, port); |
d11c1288 | 442 | } |
443 | ||
396c147e | 444 | static void |
d11c1288 | 445 | add_one_listen_addr(ServerOptions *options, char *addr, u_short port) |
446 | { | |
447 | struct addrinfo hints, *ai, *aitop; | |
448 | char strport[NI_MAXSERV]; | |
449 | int gaierr; | |
450 | ||
451 | memset(&hints, 0, sizeof(hints)); | |
31b41ceb | 452 | hints.ai_family = options->address_family; |
d11c1288 | 453 | hints.ai_socktype = SOCK_STREAM; |
454 | hints.ai_flags = (addr == NULL) ? AI_PASSIVE : 0; | |
7528d467 | 455 | snprintf(strport, sizeof strport, "%u", port); |
d11c1288 | 456 | if ((gaierr = getaddrinfo(addr, strport, &hints, &aitop)) != 0) |
457 | fatal("bad addr or host: %s (%s)", | |
458 | addr ? addr : "<NULL>", | |
459 | gai_strerror(gaierr)); | |
460 | for (ai = aitop; ai->ai_next; ai = ai->ai_next) | |
461 | ; | |
462 | ai->ai_next = options->listen_addrs; | |
463 | options->listen_addrs = aitop; | |
48e671d5 | 464 | } |
465 | ||
d231781a | 466 | /* |
467 | * The strategy for the Match blocks is that the config file is parsed twice. | |
468 | * | |
469 | * The first time is at startup. activep is initialized to 1 and the | |
470 | * directives in the global context are processed and acted on. Hitting a | |
471 | * Match directive unsets activep and the directives inside the block are | |
472 | * checked for syntax only. | |
473 | * | |
474 | * The second time is after a connection has been established but before | |
475 | * authentication. activep is initialized to 2 and global config directives | |
476 | * are ignored since they have already been processed. If the criteria in a | |
477 | * Match block is met, activep is set and the subsequent directives | |
478 | * processed and actioned until EOF or another Match block unsets it. Any | |
479 | * options set are copied into the main server config. | |
480 | * | |
481 | * Potential additions/improvements: | |
482 | * - Add Match support for pre-kex directives, eg Protocol, Ciphers. | |
483 | * | |
484 | * - Add a Tag directive (idea from David Leonard) ala pf, eg: | |
485 | * Match Address 192.168.0.* | |
486 | * Tag trusted | |
487 | * Match Group wheel | |
488 | * Tag trusted | |
489 | * Match Tag trusted | |
490 | * AllowTcpForwarding yes | |
491 | * GatewayPorts clientspecified | |
492 | * [...] | |
493 | * | |
494 | * - Add a PermittedChannelRequests directive | |
495 | * Match Group shell | |
496 | * PermittedChannelRequests session,forwarded-tcpip | |
497 | */ | |
498 | ||
499 | static int | |
500 | match_cfg_line(char **condition, int line, const char *user, const char *host, | |
501 | const char *address) | |
502 | { | |
503 | int result = 1; | |
504 | char *arg, *attrib, *cp = *condition; | |
505 | size_t len; | |
506 | ||
507 | if (user == NULL) | |
508 | debug3("checking syntax for 'Match %s'", cp); | |
509 | else | |
510 | debug3("checking match for '%s' user %s host %s addr %s", cp, | |
511 | user ? user : "(null)", host ? host : "(null)", | |
512 | address ? address : "(null)"); | |
513 | ||
514 | while ((attrib = strdelim(&cp)) && *attrib != '\0') { | |
515 | if ((arg = strdelim(&cp)) == NULL || *arg == '\0') { | |
516 | error("Missing Match criteria for %s", attrib); | |
517 | return -1; | |
518 | } | |
519 | len = strlen(arg); | |
520 | if (strcasecmp(attrib, "user") == 0) { | |
521 | if (!user) { | |
522 | result = 0; | |
523 | continue; | |
524 | } | |
525 | if (match_pattern_list(user, arg, len, 0) != 1) | |
526 | result = 0; | |
527 | else | |
528 | debug("user %.100s matched 'User %.100s' at " | |
529 | "line %d", user, arg, line); | |
530 | } else if (strcasecmp(attrib, "host") == 0) { | |
531 | if (!host) { | |
532 | result = 0; | |
533 | continue; | |
534 | } | |
535 | if (match_hostname(host, arg, len) != 1) | |
536 | result = 0; | |
537 | else | |
538 | debug("connection from %.100s matched 'Host " | |
539 | "%.100s' at line %d", host, arg, line); | |
540 | } else if (strcasecmp(attrib, "address") == 0) { | |
541 | debug("address '%s' arg '%s'", address, arg); | |
542 | if (!address) { | |
543 | result = 0; | |
544 | continue; | |
545 | } | |
546 | if (match_hostname(address, arg, len) != 1) | |
547 | result = 0; | |
548 | else | |
549 | debug("connection from %.100s matched 'Address " | |
550 | "%.100s' at line %d", address, arg, line); | |
551 | } else { | |
552 | error("Unsupported Match attribute %s", attrib); | |
553 | return -1; | |
554 | } | |
555 | } | |
556 | if (user != NULL) | |
557 | debug3("match %sfound", result ? "" : "not "); | |
558 | *condition = cp; | |
559 | return result; | |
560 | } | |
561 | ||
e7259e8d | 562 | #define WHITESPACE " \t\r\n" |
563 | ||
2717fa0f | 564 | int |
565 | process_server_config_line(ServerOptions *options, char *line, | |
d231781a | 566 | const char *filename, int linenum, int *activep, const char *user, |
567 | const char *host, const char *address) | |
8efc0c15 | 568 | { |
d11c1288 | 569 | char *cp, **charptr, *arg, *p; |
d231781a | 570 | int cmdline = 0, *intptr, value, n; |
5260325f | 571 | ServerOpCodes opcode; |
3867aa0a | 572 | u_short port; |
d231781a | 573 | u_int i, flags = 0; |
d66ce1a1 | 574 | size_t len; |
5260325f | 575 | |
2717fa0f | 576 | cp = line; |
0f8cd5a6 | 577 | if ((arg = strdelim(&cp)) == NULL) |
88299971 | 578 | return 0; |
2717fa0f | 579 | /* Ignore leading whitespace */ |
580 | if (*arg == '\0') | |
704b1659 | 581 | arg = strdelim(&cp); |
2717fa0f | 582 | if (!arg || !*arg || *arg == '#') |
583 | return 0; | |
584 | intptr = NULL; | |
585 | charptr = NULL; | |
d231781a | 586 | opcode = parse_token(arg, filename, linenum, &flags); |
587 | ||
588 | if (activep == NULL) { /* We are processing a command line directive */ | |
589 | cmdline = 1; | |
590 | activep = &cmdline; | |
591 | } | |
592 | if (*activep && opcode != sMatch) | |
593 | debug3("%s:%d setting %s %s", filename, linenum, arg, cp); | |
594 | if (*activep == 0 && !(flags & SSHCFG_MATCH)) { | |
595 | if (user == NULL) { | |
596 | fatal("%s line %d: Directive '%s' is not allowed " | |
597 | "within a Match block", filename, linenum, arg); | |
598 | } else { /* this is a directive we have already processed */ | |
599 | while (arg) | |
600 | arg = strdelim(&cp); | |
601 | return 0; | |
602 | } | |
603 | } | |
604 | ||
2717fa0f | 605 | switch (opcode) { |
606 | /* Portable-specific options */ | |
7fceb20d | 607 | case sUsePAM: |
608 | intptr = &options->use_pam; | |
2717fa0f | 609 | goto parse_flag; |
48e671d5 | 610 | |
2717fa0f | 611 | /* Standard Options */ |
612 | case sBadOption: | |
613 | return -1; | |
614 | case sPort: | |
615 | /* ignore ports from configfile if cmdline specifies ports */ | |
616 | if (options->ports_from_cmdline) | |
617 | return 0; | |
618 | if (options->listen_addrs != NULL) | |
619 | fatal("%s line %d: ports must be specified before " | |
3a454b6a | 620 | "ListenAddress.", filename, linenum); |
2717fa0f | 621 | if (options->num_ports >= MAX_PORTS) |
622 | fatal("%s line %d: too many ports.", | |
623 | filename, linenum); | |
624 | arg = strdelim(&cp); | |
625 | if (!arg || *arg == '\0') | |
626 | fatal("%s line %d: missing port number.", | |
627 | filename, linenum); | |
628 | options->ports[options->num_ports++] = a2port(arg); | |
629 | if (options->ports[options->num_ports-1] == 0) | |
630 | fatal("%s line %d: Badly formatted port number.", | |
631 | filename, linenum); | |
632 | break; | |
633 | ||
634 | case sServerKeyBits: | |
635 | intptr = &options->server_key_bits; | |
5260325f | 636 | parse_int: |
2717fa0f | 637 | arg = strdelim(&cp); |
638 | if (!arg || *arg == '\0') | |
639 | fatal("%s line %d: missing integer value.", | |
640 | filename, linenum); | |
641 | value = atoi(arg); | |
d231781a | 642 | if (*activep && *intptr == -1) |
2717fa0f | 643 | *intptr = value; |
644 | break; | |
645 | ||
646 | case sLoginGraceTime: | |
647 | intptr = &options->login_grace_time; | |
e2b1fb42 | 648 | parse_time: |
2717fa0f | 649 | arg = strdelim(&cp); |
650 | if (!arg || *arg == '\0') | |
651 | fatal("%s line %d: missing time value.", | |
652 | filename, linenum); | |
653 | if ((value = convtime(arg)) == -1) | |
654 | fatal("%s line %d: invalid time value.", | |
655 | filename, linenum); | |
656 | if (*intptr == -1) | |
657 | *intptr = value; | |
658 | break; | |
659 | ||
660 | case sKeyRegenerationTime: | |
661 | intptr = &options->key_regeneration_time; | |
662 | goto parse_time; | |
663 | ||
664 | case sListenAddress: | |
665 | arg = strdelim(&cp); | |
3867aa0a | 666 | if (arg == NULL || *arg == '\0') |
667 | fatal("%s line %d: missing address", | |
2717fa0f | 668 | filename, linenum); |
91135a0e | 669 | /* check for bare IPv6 address: no "[]" and 2 or more ":" */ |
670 | if (strchr(arg, '[') == NULL && (p = strchr(arg, ':')) != NULL | |
671 | && strchr(p+1, ':') != NULL) { | |
672 | add_listen_addr(options, arg, 0); | |
673 | break; | |
674 | } | |
3867aa0a | 675 | p = hpdelim(&arg); |
676 | if (p == NULL) | |
677 | fatal("%s line %d: bad address:port usage", | |
2717fa0f | 678 | filename, linenum); |
3867aa0a | 679 | p = cleanhostname(p); |
680 | if (arg == NULL) | |
681 | port = 0; | |
682 | else if ((port = a2port(arg)) == 0) | |
683 | fatal("%s line %d: bad port number", filename, linenum); | |
684 | ||
685 | add_listen_addr(options, p, port); | |
686 | ||
2717fa0f | 687 | break; |
688 | ||
31b41ceb | 689 | case sAddressFamily: |
690 | arg = strdelim(&cp); | |
38634ff6 | 691 | if (!arg || *arg == '\0') |
692 | fatal("%s line %d: missing address family.", | |
693 | filename, linenum); | |
31b41ceb | 694 | intptr = &options->address_family; |
695 | if (options->listen_addrs != NULL) | |
696 | fatal("%s line %d: address family must be specified before " | |
697 | "ListenAddress.", filename, linenum); | |
698 | if (strcasecmp(arg, "inet") == 0) | |
699 | value = AF_INET; | |
700 | else if (strcasecmp(arg, "inet6") == 0) | |
701 | value = AF_INET6; | |
702 | else if (strcasecmp(arg, "any") == 0) | |
703 | value = AF_UNSPEC; | |
704 | else | |
705 | fatal("%s line %d: unsupported address family \"%s\".", | |
706 | filename, linenum, arg); | |
707 | if (*intptr == -1) | |
708 | *intptr = value; | |
709 | break; | |
710 | ||
2717fa0f | 711 | case sHostKeyFile: |
712 | intptr = &options->num_host_key_files; | |
713 | if (*intptr >= MAX_HOSTKEYS) | |
714 | fatal("%s line %d: too many host keys specified (max %d).", | |
715 | filename, linenum, MAX_HOSTKEYS); | |
716 | charptr = &options->host_key_files[*intptr]; | |
fa649821 | 717 | parse_filename: |
2717fa0f | 718 | arg = strdelim(&cp); |
719 | if (!arg || *arg == '\0') | |
720 | fatal("%s line %d: missing file name.", | |
721 | filename, linenum); | |
d231781a | 722 | if (*activep && *charptr == NULL) { |
2717fa0f | 723 | *charptr = tilde_expand_filename(arg, getuid()); |
724 | /* increase optional counter */ | |
725 | if (intptr != NULL) | |
726 | *intptr = *intptr + 1; | |
727 | } | |
728 | break; | |
0fbe8c74 | 729 | |
2717fa0f | 730 | case sPidFile: |
731 | charptr = &options->pid_file; | |
732 | goto parse_filename; | |
5260325f | 733 | |
2717fa0f | 734 | case sPermitRootLogin: |
735 | intptr = &options->permit_root_login; | |
736 | arg = strdelim(&cp); | |
737 | if (!arg || *arg == '\0') | |
738 | fatal("%s line %d: missing yes/" | |
739 | "without-password/forced-commands-only/no " | |
740 | "argument.", filename, linenum); | |
741 | value = 0; /* silence compiler */ | |
742 | if (strcmp(arg, "without-password") == 0) | |
743 | value = PERMIT_NO_PASSWD; | |
744 | else if (strcmp(arg, "forced-commands-only") == 0) | |
745 | value = PERMIT_FORCED_ONLY; | |
746 | else if (strcmp(arg, "yes") == 0) | |
747 | value = PERMIT_YES; | |
748 | else if (strcmp(arg, "no") == 0) | |
749 | value = PERMIT_NO; | |
750 | else | |
751 | fatal("%s line %d: Bad yes/" | |
752 | "without-password/forced-commands-only/no " | |
753 | "argument: %s", filename, linenum, arg); | |
754 | if (*intptr == -1) | |
755 | *intptr = value; | |
756 | break; | |
757 | ||
758 | case sIgnoreRhosts: | |
759 | intptr = &options->ignore_rhosts; | |
5260325f | 760 | parse_flag: |
2717fa0f | 761 | arg = strdelim(&cp); |
762 | if (!arg || *arg == '\0') | |
763 | fatal("%s line %d: missing yes/no argument.", | |
764 | filename, linenum); | |
765 | value = 0; /* silence compiler */ | |
766 | if (strcmp(arg, "yes") == 0) | |
767 | value = 1; | |
768 | else if (strcmp(arg, "no") == 0) | |
769 | value = 0; | |
770 | else | |
771 | fatal("%s line %d: Bad yes/no argument: %s", | |
772 | filename, linenum, arg); | |
d231781a | 773 | if (*activep && *intptr == -1) |
2717fa0f | 774 | *intptr = value; |
775 | break; | |
776 | ||
777 | case sIgnoreUserKnownHosts: | |
778 | intptr = &options->ignore_user_known_hosts; | |
779 | goto parse_flag; | |
780 | ||
2717fa0f | 781 | case sRhostsRSAAuthentication: |
782 | intptr = &options->rhosts_rsa_authentication; | |
783 | goto parse_flag; | |
784 | ||
785 | case sHostbasedAuthentication: | |
786 | intptr = &options->hostbased_authentication; | |
787 | goto parse_flag; | |
788 | ||
789 | case sHostbasedUsesNameFromPacketOnly: | |
790 | intptr = &options->hostbased_uses_name_from_packet_only; | |
791 | goto parse_flag; | |
792 | ||
793 | case sRSAAuthentication: | |
794 | intptr = &options->rsa_authentication; | |
795 | goto parse_flag; | |
796 | ||
797 | case sPubkeyAuthentication: | |
798 | intptr = &options->pubkey_authentication; | |
799 | goto parse_flag; | |
d0ec7f42 | 800 | |
2717fa0f | 801 | case sKerberosAuthentication: |
802 | intptr = &options->kerberos_authentication; | |
803 | goto parse_flag; | |
5260325f | 804 | |
2717fa0f | 805 | case sKerberosOrLocalPasswd: |
806 | intptr = &options->kerberos_or_local_passwd; | |
807 | goto parse_flag; | |
5260325f | 808 | |
2717fa0f | 809 | case sKerberosTicketCleanup: |
810 | intptr = &options->kerberos_ticket_cleanup; | |
811 | goto parse_flag; | |
d0ec7f42 | 812 | |
a1e30b47 | 813 | case sKerberosGetAFSToken: |
814 | intptr = &options->kerberos_get_afs_token; | |
815 | goto parse_flag; | |
816 | ||
7364bd04 | 817 | case sGssAuthentication: |
818 | intptr = &options->gss_authentication; | |
819 | goto parse_flag; | |
820 | ||
821 | case sGssCleanupCreds: | |
822 | intptr = &options->gss_cleanup_creds; | |
823 | goto parse_flag; | |
824 | ||
2717fa0f | 825 | case sPasswordAuthentication: |
826 | intptr = &options->password_authentication; | |
827 | goto parse_flag; | |
5260325f | 828 | |
2717fa0f | 829 | case sKbdInteractiveAuthentication: |
830 | intptr = &options->kbd_interactive_authentication; | |
831 | goto parse_flag; | |
8002af61 | 832 | |
2717fa0f | 833 | case sChallengeResponseAuthentication: |
834 | intptr = &options->challenge_response_authentication; | |
835 | goto parse_flag; | |
8002af61 | 836 | |
2717fa0f | 837 | case sPrintMotd: |
838 | intptr = &options->print_motd; | |
839 | goto parse_flag; | |
5260325f | 840 | |
2717fa0f | 841 | case sPrintLastLog: |
842 | intptr = &options->print_lastlog; | |
843 | goto parse_flag; | |
5260325f | 844 | |
2717fa0f | 845 | case sX11Forwarding: |
846 | intptr = &options->x11_forwarding; | |
847 | goto parse_flag; | |
5260325f | 848 | |
2717fa0f | 849 | case sX11DisplayOffset: |
850 | intptr = &options->x11_display_offset; | |
851 | goto parse_int; | |
8efc0c15 | 852 | |
e6e573bd | 853 | case sX11UseLocalhost: |
854 | intptr = &options->x11_use_localhost; | |
855 | goto parse_flag; | |
856 | ||
2717fa0f | 857 | case sXAuthLocation: |
858 | charptr = &options->xauth_location; | |
859 | goto parse_filename; | |
5260325f | 860 | |
2717fa0f | 861 | case sStrictModes: |
862 | intptr = &options->strict_modes; | |
863 | goto parse_flag; | |
5260325f | 864 | |
fd573618 | 865 | case sTCPKeepAlive: |
866 | intptr = &options->tcp_keep_alive; | |
2717fa0f | 867 | goto parse_flag; |
33de75a3 | 868 | |
2717fa0f | 869 | case sEmptyPasswd: |
870 | intptr = &options->permit_empty_passwd; | |
871 | goto parse_flag; | |
5260325f | 872 | |
f00bab84 | 873 | case sPermitUserEnvironment: |
874 | intptr = &options->permit_user_env; | |
875 | goto parse_flag; | |
876 | ||
2717fa0f | 877 | case sUseLogin: |
878 | intptr = &options->use_login; | |
879 | goto parse_flag; | |
5260325f | 880 | |
636f76ca | 881 | case sCompression: |
882 | intptr = &options->compression; | |
07200973 | 883 | arg = strdelim(&cp); |
884 | if (!arg || *arg == '\0') | |
885 | fatal("%s line %d: missing yes/no/delayed " | |
886 | "argument.", filename, linenum); | |
887 | value = 0; /* silence compiler */ | |
888 | if (strcmp(arg, "delayed") == 0) | |
889 | value = COMP_DELAYED; | |
890 | else if (strcmp(arg, "yes") == 0) | |
891 | value = COMP_ZLIB; | |
892 | else if (strcmp(arg, "no") == 0) | |
893 | value = COMP_NONE; | |
894 | else | |
895 | fatal("%s line %d: Bad yes/no/delayed " | |
896 | "argument: %s", filename, linenum, arg); | |
897 | if (*intptr == -1) | |
898 | *intptr = value; | |
899 | break; | |
636f76ca | 900 | |
2717fa0f | 901 | case sGatewayPorts: |
902 | intptr = &options->gateway_ports; | |
3867aa0a | 903 | arg = strdelim(&cp); |
904 | if (!arg || *arg == '\0') | |
905 | fatal("%s line %d: missing yes/no/clientspecified " | |
906 | "argument.", filename, linenum); | |
907 | value = 0; /* silence compiler */ | |
908 | if (strcmp(arg, "clientspecified") == 0) | |
909 | value = 2; | |
910 | else if (strcmp(arg, "yes") == 0) | |
911 | value = 1; | |
912 | else if (strcmp(arg, "no") == 0) | |
913 | value = 0; | |
914 | else | |
915 | fatal("%s line %d: Bad yes/no/clientspecified " | |
916 | "argument: %s", filename, linenum, arg); | |
917 | if (*intptr == -1) | |
918 | *intptr = value; | |
919 | break; | |
5260325f | 920 | |
c5a7d788 | 921 | case sUseDNS: |
922 | intptr = &options->use_dns; | |
2717fa0f | 923 | goto parse_flag; |
5260325f | 924 | |
2717fa0f | 925 | case sLogFacility: |
926 | intptr = (int *) &options->log_facility; | |
927 | arg = strdelim(&cp); | |
928 | value = log_facility_number(arg); | |
5eaf8578 | 929 | if (value == SYSLOG_FACILITY_NOT_SET) |
2717fa0f | 930 | fatal("%.200s line %d: unsupported log facility '%s'", |
931 | filename, linenum, arg ? arg : "<NONE>"); | |
932 | if (*intptr == -1) | |
933 | *intptr = (SyslogFacility) value; | |
934 | break; | |
935 | ||
936 | case sLogLevel: | |
937 | intptr = (int *) &options->log_level; | |
938 | arg = strdelim(&cp); | |
939 | value = log_level_number(arg); | |
5eaf8578 | 940 | if (value == SYSLOG_LEVEL_NOT_SET) |
2717fa0f | 941 | fatal("%.200s line %d: unsupported log level '%s'", |
942 | filename, linenum, arg ? arg : "<NONE>"); | |
943 | if (*intptr == -1) | |
944 | *intptr = (LogLevel) value; | |
945 | break; | |
946 | ||
947 | case sAllowTcpForwarding: | |
948 | intptr = &options->allow_tcp_forwarding; | |
949 | goto parse_flag; | |
950 | ||
1853d1ef | 951 | case sUsePrivilegeSeparation: |
952 | intptr = &use_privsep; | |
953 | goto parse_flag; | |
954 | ||
2717fa0f | 955 | case sAllowUsers: |
956 | while ((arg = strdelim(&cp)) && *arg != '\0') { | |
957 | if (options->num_allow_users >= MAX_ALLOW_USERS) | |
958 | fatal("%s line %d: too many allow users.", | |
959 | filename, linenum); | |
7528d467 | 960 | options->allow_users[options->num_allow_users++] = |
961 | xstrdup(arg); | |
2717fa0f | 962 | } |
963 | break; | |
a8be9f80 | 964 | |
2717fa0f | 965 | case sDenyUsers: |
966 | while ((arg = strdelim(&cp)) && *arg != '\0') { | |
967 | if (options->num_deny_users >= MAX_DENY_USERS) | |
d4f40d92 | 968 | fatal("%s line %d: too many deny users.", |
2717fa0f | 969 | filename, linenum); |
7528d467 | 970 | options->deny_users[options->num_deny_users++] = |
971 | xstrdup(arg); | |
2717fa0f | 972 | } |
973 | break; | |
b2552997 | 974 | |
2717fa0f | 975 | case sAllowGroups: |
976 | while ((arg = strdelim(&cp)) && *arg != '\0') { | |
977 | if (options->num_allow_groups >= MAX_ALLOW_GROUPS) | |
978 | fatal("%s line %d: too many allow groups.", | |
979 | filename, linenum); | |
7528d467 | 980 | options->allow_groups[options->num_allow_groups++] = |
981 | xstrdup(arg); | |
2717fa0f | 982 | } |
983 | break; | |
a8be9f80 | 984 | |
2717fa0f | 985 | case sDenyGroups: |
986 | while ((arg = strdelim(&cp)) && *arg != '\0') { | |
987 | if (options->num_deny_groups >= MAX_DENY_GROUPS) | |
988 | fatal("%s line %d: too many deny groups.", | |
989 | filename, linenum); | |
990 | options->deny_groups[options->num_deny_groups++] = xstrdup(arg); | |
991 | } | |
992 | break; | |
38c295d6 | 993 | |
2717fa0f | 994 | case sCiphers: |
995 | arg = strdelim(&cp); | |
996 | if (!arg || *arg == '\0') | |
997 | fatal("%s line %d: Missing argument.", filename, linenum); | |
998 | if (!ciphers_valid(arg)) | |
999 | fatal("%s line %d: Bad SSH2 cipher spec '%s'.", | |
1000 | filename, linenum, arg ? arg : "<NONE>"); | |
1001 | if (options->ciphers == NULL) | |
1002 | options->ciphers = xstrdup(arg); | |
1003 | break; | |
1004 | ||
1005 | case sMacs: | |
1006 | arg = strdelim(&cp); | |
1007 | if (!arg || *arg == '\0') | |
1008 | fatal("%s line %d: Missing argument.", filename, linenum); | |
1009 | if (!mac_valid(arg)) | |
1010 | fatal("%s line %d: Bad SSH2 mac spec '%s'.", | |
1011 | filename, linenum, arg ? arg : "<NONE>"); | |
1012 | if (options->macs == NULL) | |
1013 | options->macs = xstrdup(arg); | |
1014 | break; | |
1015 | ||
1016 | case sProtocol: | |
1017 | intptr = &options->protocol; | |
1018 | arg = strdelim(&cp); | |
1019 | if (!arg || *arg == '\0') | |
1020 | fatal("%s line %d: Missing argument.", filename, linenum); | |
1021 | value = proto_spec(arg); | |
1022 | if (value == SSH_PROTO_UNKNOWN) | |
1023 | fatal("%s line %d: Bad protocol spec '%s'.", | |
184eed6a | 1024 | filename, linenum, arg ? arg : "<NONE>"); |
2717fa0f | 1025 | if (*intptr == SSH_PROTO_UNKNOWN) |
1026 | *intptr = value; | |
1027 | break; | |
1028 | ||
1029 | case sSubsystem: | |
1030 | if (options->num_subsystems >= MAX_SUBSYSTEMS) { | |
1031 | fatal("%s line %d: too many subsystems defined.", | |
184eed6a | 1032 | filename, linenum); |
2717fa0f | 1033 | } |
1034 | arg = strdelim(&cp); | |
1035 | if (!arg || *arg == '\0') | |
1036 | fatal("%s line %d: Missing subsystem name.", | |
184eed6a | 1037 | filename, linenum); |
d231781a | 1038 | if (!*activep) { |
1039 | arg = strdelim(&cp); | |
1040 | break; | |
1041 | } | |
2717fa0f | 1042 | for (i = 0; i < options->num_subsystems; i++) |
1043 | if (strcmp(arg, options->subsystem_name[i]) == 0) | |
1044 | fatal("%s line %d: Subsystem '%s' already defined.", | |
184eed6a | 1045 | filename, linenum, arg); |
2717fa0f | 1046 | options->subsystem_name[options->num_subsystems] = xstrdup(arg); |
1047 | arg = strdelim(&cp); | |
1048 | if (!arg || *arg == '\0') | |
1049 | fatal("%s line %d: Missing subsystem command.", | |
184eed6a | 1050 | filename, linenum); |
2717fa0f | 1051 | options->subsystem_command[options->num_subsystems] = xstrdup(arg); |
d66ce1a1 | 1052 | |
1053 | /* Collect arguments (separate to executable) */ | |
1054 | p = xstrdup(arg); | |
1055 | len = strlen(p) + 1; | |
1056 | while ((arg = strdelim(&cp)) != NULL && *arg != '\0') { | |
1057 | len += 1 + strlen(arg); | |
1058 | p = xrealloc(p, 1, len); | |
1059 | strlcat(p, " ", len); | |
1060 | strlcat(p, arg, len); | |
1061 | } | |
1062 | options->subsystem_args[options->num_subsystems] = p; | |
2717fa0f | 1063 | options->num_subsystems++; |
1064 | break; | |
1065 | ||
1066 | case sMaxStartups: | |
1067 | arg = strdelim(&cp); | |
1068 | if (!arg || *arg == '\0') | |
1069 | fatal("%s line %d: Missing MaxStartups spec.", | |
184eed6a | 1070 | filename, linenum); |
2717fa0f | 1071 | if ((n = sscanf(arg, "%d:%d:%d", |
1072 | &options->max_startups_begin, | |
1073 | &options->max_startups_rate, | |
1074 | &options->max_startups)) == 3) { | |
1075 | if (options->max_startups_begin > | |
1076 | options->max_startups || | |
1077 | options->max_startups_rate > 100 || | |
1078 | options->max_startups_rate < 1) | |
c345cf9d | 1079 | fatal("%s line %d: Illegal MaxStartups spec.", |
97de229c | 1080 | filename, linenum); |
2717fa0f | 1081 | } else if (n != 1) |
1082 | fatal("%s line %d: Illegal MaxStartups spec.", | |
1083 | filename, linenum); | |
1084 | else | |
1085 | options->max_startups = options->max_startups_begin; | |
1086 | break; | |
1087 | ||
af4bd935 | 1088 | case sMaxAuthTries: |
1089 | intptr = &options->max_authtries; | |
1090 | goto parse_int; | |
1091 | ||
2717fa0f | 1092 | case sBanner: |
1093 | charptr = &options->banner; | |
1094 | goto parse_filename; | |
1095 | /* | |
1096 | * These options can contain %X options expanded at | |
1097 | * connect time, so that you can specify paths like: | |
1098 | * | |
1099 | * AuthorizedKeysFile /etc/ssh_keys/%u | |
1100 | */ | |
1101 | case sAuthorizedKeysFile: | |
1102 | case sAuthorizedKeysFile2: | |
d4f40d92 | 1103 | charptr = (opcode == sAuthorizedKeysFile) ? |
2717fa0f | 1104 | &options->authorized_keys_file : |
1105 | &options->authorized_keys_file2; | |
1106 | goto parse_filename; | |
1107 | ||
1108 | case sClientAliveInterval: | |
1109 | intptr = &options->client_alive_interval; | |
1110 | goto parse_time; | |
1111 | ||
1112 | case sClientAliveCountMax: | |
1113 | intptr = &options->client_alive_count_max; | |
1114 | goto parse_int; | |
1115 | ||
61a2c1da | 1116 | case sAcceptEnv: |
1117 | while ((arg = strdelim(&cp)) && *arg != '\0') { | |
1118 | if (strchr(arg, '=') != NULL) | |
1119 | fatal("%s line %d: Invalid environment name.", | |
1120 | filename, linenum); | |
1121 | if (options->num_accept_env >= MAX_ACCEPT_ENV) | |
1122 | fatal("%s line %d: too many allow env.", | |
1123 | filename, linenum); | |
d231781a | 1124 | if (!*activep) |
1125 | break; | |
61a2c1da | 1126 | options->accept_env[options->num_accept_env++] = |
1127 | xstrdup(arg); | |
1128 | } | |
1129 | break; | |
1130 | ||
d20f3c9e | 1131 | case sPermitTunnel: |
1132 | intptr = &options->permit_tun; | |
a4f24bf8 | 1133 | arg = strdelim(&cp); |
1134 | if (!arg || *arg == '\0') | |
1135 | fatal("%s line %d: Missing yes/point-to-point/" | |
1136 | "ethernet/no argument.", filename, linenum); | |
1137 | value = 0; /* silence compiler */ | |
1138 | if (strcasecmp(arg, "ethernet") == 0) | |
1139 | value = SSH_TUNMODE_ETHERNET; | |
1140 | else if (strcasecmp(arg, "point-to-point") == 0) | |
1141 | value = SSH_TUNMODE_POINTOPOINT; | |
1142 | else if (strcasecmp(arg, "yes") == 0) | |
1143 | value = SSH_TUNMODE_YES; | |
1144 | else if (strcasecmp(arg, "no") == 0) | |
1145 | value = SSH_TUNMODE_NO; | |
1146 | else | |
1147 | fatal("%s line %d: Bad yes/point-to-point/ethernet/" | |
1148 | "no argument: %s", filename, linenum, arg); | |
1149 | if (*intptr == -1) | |
1150 | *intptr = value; | |
1151 | break; | |
d20f3c9e | 1152 | |
d231781a | 1153 | case sMatch: |
1154 | if (cmdline) | |
1155 | fatal("Match directive not supported as a command-line " | |
1156 | "option"); | |
1157 | value = match_cfg_line(&cp, linenum, user, host, address); | |
1158 | if (value < 0) | |
1159 | fatal("%s line %d: Bad Match condition", filename, | |
1160 | linenum); | |
1161 | *activep = value; | |
1162 | break; | |
1163 | ||
2fefbadf | 1164 | case sPermitOpen: |
1165 | arg = strdelim(&cp); | |
1166 | if (!arg || *arg == '\0') | |
1167 | fatal("%s line %d: missing PermitOpen specification", | |
1168 | filename, linenum); | |
1169 | if (strcmp(arg, "any") == 0) { | |
ea46e550 | 1170 | if (*activep) { |
2fefbadf | 1171 | channel_clear_adm_permitted_opens(); |
ea46e550 | 1172 | options->num_permitted_opens = 0; |
1173 | } | |
2fefbadf | 1174 | break; |
1175 | } | |
ea46e550 | 1176 | for (; arg != NULL && *arg != '\0'; arg = strdelim(&cp)) { |
1177 | p = hpdelim(&arg); | |
1178 | if (p == NULL) | |
1179 | fatal("%s line %d: missing host in PermitOpen", | |
1180 | filename, linenum); | |
1181 | p = cleanhostname(p); | |
1182 | if (arg == NULL || (port = a2port(arg)) == 0) | |
1183 | fatal("%s line %d: bad port number in " | |
1184 | "PermitOpen", filename, linenum); | |
1185 | if (*activep && options->num_permitted_opens == -1) { | |
1186 | channel_clear_adm_permitted_opens(); | |
1187 | options->num_permitted_opens = | |
1188 | channel_add_adm_permitted_opens(p, port); | |
1189 | } | |
1190 | } | |
2fefbadf | 1191 | break; |
1192 | ||
e7259e8d | 1193 | case sForceCommand: |
1194 | if (cp == NULL) | |
1195 | fatal("%.200s line %d: Missing argument.", filename, | |
1196 | linenum); | |
1197 | len = strspn(cp, WHITESPACE); | |
1198 | if (*activep && options->adm_forced_command == NULL) | |
1199 | options->adm_forced_command = xstrdup(cp + len); | |
1200 | return 0; | |
1201 | ||
2717fa0f | 1202 | case sDeprecated: |
bbe88b6d | 1203 | logit("%s line %d: Deprecated option %s", |
2717fa0f | 1204 | filename, linenum, arg); |
1205 | while (arg) | |
1206 | arg = strdelim(&cp); | |
1207 | break; | |
1208 | ||
a2144546 | 1209 | case sUnsupported: |
1210 | logit("%s line %d: Unsupported option %s", | |
1211 | filename, linenum, arg); | |
1212 | while (arg) | |
1213 | arg = strdelim(&cp); | |
1214 | break; | |
1215 | ||
2717fa0f | 1216 | default: |
1217 | fatal("%s line %d: Missing handler for opcode %s (%d)", | |
1218 | filename, linenum, arg, opcode); | |
1219 | } | |
1220 | if ((arg = strdelim(&cp)) != NULL && *arg != '\0') | |
1221 | fatal("%s line %d: garbage at end of line; \"%.200s\".", | |
1222 | filename, linenum, arg); | |
1223 | return 0; | |
1224 | } | |
089fbbd2 | 1225 | |
2717fa0f | 1226 | /* Reads the server configuration file. */ |
5c53a31e | 1227 | |
2717fa0f | 1228 | void |
b9a549d7 | 1229 | load_server_config(const char *filename, Buffer *conf) |
2717fa0f | 1230 | { |
b9a549d7 | 1231 | char line[1024], *cp; |
7528d467 | 1232 | FILE *f; |
2717fa0f | 1233 | |
b9a549d7 | 1234 | debug2("%s: filename %s", __func__, filename); |
1235 | if ((f = fopen(filename, "r")) == NULL) { | |
2717fa0f | 1236 | perror(filename); |
1237 | exit(1); | |
1238 | } | |
b9a549d7 | 1239 | buffer_clear(conf); |
2717fa0f | 1240 | while (fgets(line, sizeof(line), f)) { |
b9a549d7 | 1241 | /* |
1242 | * Trim out comments and strip whitespace | |
f2107e97 | 1243 | * NB - preserve newlines, they are needed to reproduce |
b9a549d7 | 1244 | * line numbers later for error messages |
1245 | */ | |
1246 | if ((cp = strchr(line, '#')) != NULL) | |
1247 | memcpy(cp, "\n", 2); | |
1248 | cp = line + strspn(line, " \t\r"); | |
1249 | ||
1250 | buffer_append(conf, cp, strlen(cp)); | |
8efc0c15 | 1251 | } |
b9a549d7 | 1252 | buffer_append(conf, "\0", 1); |
5260325f | 1253 | fclose(f); |
b9a549d7 | 1254 | debug2("%s: done config len = %d", __func__, buffer_len(conf)); |
1255 | } | |
1256 | ||
1257 | void | |
d231781a | 1258 | parse_server_match_config(ServerOptions *options, const char *user, |
1259 | const char *host, const char *address) | |
1260 | { | |
1261 | ServerOptions mo; | |
1262 | ||
1263 | initialize_server_options(&mo); | |
1264 | parse_server_config(&mo, "reprocess config", &cfg, user, host, address); | |
1265 | copy_set_server_options(options, &mo); | |
1266 | } | |
1267 | ||
1268 | /* Copy any (supported) values that are set */ | |
1269 | void | |
1270 | copy_set_server_options(ServerOptions *dst, ServerOptions *src) | |
1271 | { | |
1272 | if (src->allow_tcp_forwarding != -1) | |
1273 | dst->allow_tcp_forwarding = src->allow_tcp_forwarding; | |
1274 | if (src->gateway_ports != -1) | |
1275 | dst->gateway_ports = src->gateway_ports; | |
e7259e8d | 1276 | if (src->adm_forced_command != NULL) { |
1277 | if (dst->adm_forced_command != NULL) | |
1278 | xfree(dst->adm_forced_command); | |
1279 | dst->adm_forced_command = src->adm_forced_command; | |
1280 | } | |
691712e0 | 1281 | if (src->x11_display_offset != -1) |
1282 | dst->x11_display_offset = src->x11_display_offset; | |
1283 | if (src->x11_forwarding != -1) | |
1284 | dst->x11_forwarding = src->x11_forwarding; | |
1285 | if (src->x11_use_localhost != -1) | |
1286 | dst->x11_use_localhost = src->x11_use_localhost; | |
d231781a | 1287 | } |
1288 | ||
1289 | void | |
1290 | parse_server_config(ServerOptions *options, const char *filename, Buffer *conf, | |
1291 | const char *user, const char *host, const char *address) | |
b9a549d7 | 1292 | { |
d231781a | 1293 | int active, linenum, bad_options = 0; |
16acb158 | 1294 | char *cp, *obuf, *cbuf; |
b9a549d7 | 1295 | |
1296 | debug2("%s: config %s len %d", __func__, filename, buffer_len(conf)); | |
1297 | ||
16acb158 | 1298 | obuf = cbuf = xstrdup(buffer_ptr(conf)); |
d231781a | 1299 | active = user ? 0 : 1; |
861cc543 | 1300 | linenum = 1; |
f8cc7664 | 1301 | while ((cp = strsep(&cbuf, "\n")) != NULL) { |
b9a549d7 | 1302 | if (process_server_config_line(options, cp, filename, |
d231781a | 1303 | linenum++, &active, user, host, address) != 0) |
b9a549d7 | 1304 | bad_options++; |
1305 | } | |
16acb158 | 1306 | xfree(obuf); |
b7c70970 | 1307 | if (bad_options > 0) |
1308 | fatal("%s: terminating, %d bad configuration options", | |
1309 | filename, bad_options); | |
8efc0c15 | 1310 | } |