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2fefbadf | 1 | /* $OpenBSD: servconf.c,v 1.156 2006/07/17 12:06:00 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 | ||
c8dfff33 | 18 | #if defined(HAVE_NETDB_H) |
19 | # include <netdb.h> | |
20 | #endif | |
5188ba17 | 21 | #include <unistd.h> |
c8dfff33 | 22 | |
8efc0c15 | 23 | #include "ssh.h" |
42f11eb2 | 24 | #include "log.h" |
8efc0c15 | 25 | #include "servconf.h" |
26 | #include "xmalloc.h" | |
a8be9f80 | 27 | #include "compat.h" |
42f11eb2 | 28 | #include "pathnames.h" |
42f11eb2 | 29 | #include "misc.h" |
30 | #include "cipher.h" | |
b2552997 | 31 | #include "kex.h" |
32 | #include "mac.h" | |
d231781a | 33 | #include "match.h" |
2fefbadf | 34 | #include "channels.h" |
42f11eb2 | 35 | |
396c147e | 36 | static void add_listen_addr(ServerOptions *, char *, u_short); |
37 | static void add_one_listen_addr(ServerOptions *, char *, u_short); | |
48e671d5 | 38 | |
1853d1ef | 39 | /* Use of privilege separation or not */ |
40 | extern int use_privsep; | |
d231781a | 41 | extern Buffer cfg; |
42f11eb2 | 42 | |
8efc0c15 | 43 | /* Initializes the server options to their default values. */ |
44 | ||
6ae2364d | 45 | void |
5260325f | 46 | initialize_server_options(ServerOptions *options) |
8efc0c15 | 47 | { |
5260325f | 48 | memset(options, 0, sizeof(*options)); |
e15895cd | 49 | |
50 | /* Portable-specific options */ | |
7fceb20d | 51 | options->use_pam = -1; |
e15895cd | 52 | |
53 | /* Standard Options */ | |
48e671d5 | 54 | options->num_ports = 0; |
55 | options->ports_from_cmdline = 0; | |
56 | options->listen_addrs = NULL; | |
31b41ceb | 57 | options->address_family = -1; |
fa08c86b | 58 | options->num_host_key_files = 0; |
0fbe8c74 | 59 | options->pid_file = NULL; |
5260325f | 60 | options->server_key_bits = -1; |
61 | options->login_grace_time = -1; | |
62 | options->key_regeneration_time = -1; | |
15853e93 | 63 | options->permit_root_login = PERMIT_NOT_SET; |
5260325f | 64 | options->ignore_rhosts = -1; |
65 | options->ignore_user_known_hosts = -1; | |
66 | options->print_motd = -1; | |
4f4648f9 | 67 | options->print_lastlog = -1; |
5260325f | 68 | options->x11_forwarding = -1; |
69 | options->x11_display_offset = -1; | |
e6e573bd | 70 | options->x11_use_localhost = -1; |
fa649821 | 71 | options->xauth_location = NULL; |
5260325f | 72 | options->strict_modes = -1; |
fd573618 | 73 | options->tcp_keep_alive = -1; |
5eaf8578 | 74 | options->log_facility = SYSLOG_FACILITY_NOT_SET; |
75 | options->log_level = SYSLOG_LEVEL_NOT_SET; | |
5260325f | 76 | options->rhosts_rsa_authentication = -1; |
8002af61 | 77 | options->hostbased_authentication = -1; |
78 | options->hostbased_uses_name_from_packet_only = -1; | |
5260325f | 79 | options->rsa_authentication = -1; |
fa08c86b | 80 | options->pubkey_authentication = -1; |
5260325f | 81 | options->kerberos_authentication = -1; |
82 | options->kerberos_or_local_passwd = -1; | |
83 | options->kerberos_ticket_cleanup = -1; | |
a1e30b47 | 84 | options->kerberos_get_afs_token = -1; |
7364bd04 | 85 | options->gss_authentication=-1; |
86 | options->gss_cleanup_creds = -1; | |
5260325f | 87 | options->password_authentication = -1; |
94ec8c6b | 88 | options->kbd_interactive_authentication = -1; |
5ba55ada | 89 | options->challenge_response_authentication = -1; |
5260325f | 90 | options->permit_empty_passwd = -1; |
f00bab84 | 91 | options->permit_user_env = -1; |
5260325f | 92 | options->use_login = -1; |
636f76ca | 93 | options->compression = -1; |
33de75a3 | 94 | options->allow_tcp_forwarding = -1; |
5260325f | 95 | options->num_allow_users = 0; |
96 | options->num_deny_users = 0; | |
97 | options->num_allow_groups = 0; | |
98 | options->num_deny_groups = 0; | |
a8be9f80 | 99 | options->ciphers = NULL; |
b2552997 | 100 | options->macs = NULL; |
a8be9f80 | 101 | options->protocol = SSH_PROTO_UNKNOWN; |
1d1ffb87 | 102 | options->gateway_ports = -1; |
38c295d6 | 103 | options->num_subsystems = 0; |
c345cf9d | 104 | options->max_startups_begin = -1; |
105 | options->max_startups_rate = -1; | |
089fbbd2 | 106 | options->max_startups = -1; |
af4bd935 | 107 | options->max_authtries = -1; |
eea39c02 | 108 | options->banner = NULL; |
c5a7d788 | 109 | options->use_dns = -1; |
3ffc6336 | 110 | options->client_alive_interval = -1; |
111 | options->client_alive_count_max = -1; | |
c8445989 | 112 | options->authorized_keys_file = NULL; |
113 | options->authorized_keys_file2 = NULL; | |
61a2c1da | 114 | options->num_accept_env = 0; |
d20f3c9e | 115 | options->permit_tun = -1; |
8efc0c15 | 116 | } |
117 | ||
6ae2364d | 118 | void |
5260325f | 119 | fill_default_server_options(ServerOptions *options) |
8efc0c15 | 120 | { |
e15895cd | 121 | /* Portable-specific options */ |
7fceb20d | 122 | if (options->use_pam == -1) |
0a23d79f | 123 | options->use_pam = 0; |
e15895cd | 124 | |
125 | /* Standard Options */ | |
fa08c86b | 126 | if (options->protocol == SSH_PROTO_UNKNOWN) |
127 | options->protocol = SSH_PROTO_1|SSH_PROTO_2; | |
128 | if (options->num_host_key_files == 0) { | |
129 | /* fill default hostkeys for protocols */ | |
130 | if (options->protocol & SSH_PROTO_1) | |
0f84fe37 | 131 | options->host_key_files[options->num_host_key_files++] = |
132 | _PATH_HOST_KEY_FILE; | |
133 | if (options->protocol & SSH_PROTO_2) { | |
134 | options->host_key_files[options->num_host_key_files++] = | |
135 | _PATH_HOST_RSA_KEY_FILE; | |
136 | options->host_key_files[options->num_host_key_files++] = | |
137 | _PATH_HOST_DSA_KEY_FILE; | |
138 | } | |
fa08c86b | 139 | } |
48e671d5 | 140 | if (options->num_ports == 0) |
141 | options->ports[options->num_ports++] = SSH_DEFAULT_PORT; | |
142 | if (options->listen_addrs == NULL) | |
2d2a2c65 | 143 | add_listen_addr(options, NULL, 0); |
0fbe8c74 | 144 | if (options->pid_file == NULL) |
42f11eb2 | 145 | options->pid_file = _PATH_SSH_DAEMON_PID_FILE; |
5260325f | 146 | if (options->server_key_bits == -1) |
147 | options->server_key_bits = 768; | |
148 | if (options->login_grace_time == -1) | |
3445ca02 | 149 | options->login_grace_time = 120; |
5260325f | 150 | if (options->key_regeneration_time == -1) |
151 | options->key_regeneration_time = 3600; | |
15853e93 | 152 | if (options->permit_root_login == PERMIT_NOT_SET) |
153 | options->permit_root_login = PERMIT_YES; | |
5260325f | 154 | if (options->ignore_rhosts == -1) |
c8d54615 | 155 | options->ignore_rhosts = 1; |
5260325f | 156 | if (options->ignore_user_known_hosts == -1) |
157 | options->ignore_user_known_hosts = 0; | |
5260325f | 158 | if (options->print_motd == -1) |
159 | options->print_motd = 1; | |
4f4648f9 | 160 | if (options->print_lastlog == -1) |
161 | options->print_lastlog = 1; | |
5260325f | 162 | if (options->x11_forwarding == -1) |
c8d54615 | 163 | options->x11_forwarding = 0; |
5260325f | 164 | if (options->x11_display_offset == -1) |
c8d54615 | 165 | options->x11_display_offset = 10; |
e6e573bd | 166 | if (options->x11_use_localhost == -1) |
167 | options->x11_use_localhost = 1; | |
fa649821 | 168 | if (options->xauth_location == NULL) |
fd9ede94 | 169 | options->xauth_location = _PATH_XAUTH; |
5260325f | 170 | if (options->strict_modes == -1) |
171 | options->strict_modes = 1; | |
fd573618 | 172 | if (options->tcp_keep_alive == -1) |
173 | options->tcp_keep_alive = 1; | |
5eaf8578 | 174 | if (options->log_facility == SYSLOG_FACILITY_NOT_SET) |
5260325f | 175 | options->log_facility = SYSLOG_FACILITY_AUTH; |
5eaf8578 | 176 | if (options->log_level == SYSLOG_LEVEL_NOT_SET) |
59c97189 | 177 | options->log_level = SYSLOG_LEVEL_INFO; |
5260325f | 178 | if (options->rhosts_rsa_authentication == -1) |
c8d54615 | 179 | options->rhosts_rsa_authentication = 0; |
8002af61 | 180 | if (options->hostbased_authentication == -1) |
181 | options->hostbased_authentication = 0; | |
182 | if (options->hostbased_uses_name_from_packet_only == -1) | |
183 | options->hostbased_uses_name_from_packet_only = 0; | |
5260325f | 184 | if (options->rsa_authentication == -1) |
185 | options->rsa_authentication = 1; | |
fa08c86b | 186 | if (options->pubkey_authentication == -1) |
187 | options->pubkey_authentication = 1; | |
5260325f | 188 | if (options->kerberos_authentication == -1) |
eadc806d | 189 | options->kerberos_authentication = 0; |
5260325f | 190 | if (options->kerberos_or_local_passwd == -1) |
191 | options->kerberos_or_local_passwd = 1; | |
192 | if (options->kerberos_ticket_cleanup == -1) | |
193 | options->kerberos_ticket_cleanup = 1; | |
a1e30b47 | 194 | if (options->kerberos_get_afs_token == -1) |
195 | options->kerberos_get_afs_token = 0; | |
7364bd04 | 196 | if (options->gss_authentication == -1) |
197 | options->gss_authentication = 0; | |
198 | if (options->gss_cleanup_creds == -1) | |
199 | options->gss_cleanup_creds = 1; | |
5260325f | 200 | if (options->password_authentication == -1) |
201 | options->password_authentication = 1; | |
94ec8c6b | 202 | if (options->kbd_interactive_authentication == -1) |
203 | options->kbd_interactive_authentication = 0; | |
5ba55ada | 204 | if (options->challenge_response_authentication == -1) |
205 | options->challenge_response_authentication = 1; | |
5260325f | 206 | if (options->permit_empty_passwd == -1) |
c8d54615 | 207 | options->permit_empty_passwd = 0; |
f00bab84 | 208 | if (options->permit_user_env == -1) |
209 | options->permit_user_env = 0; | |
5260325f | 210 | if (options->use_login == -1) |
211 | options->use_login = 0; | |
636f76ca | 212 | if (options->compression == -1) |
07200973 | 213 | options->compression = COMP_DELAYED; |
33de75a3 | 214 | if (options->allow_tcp_forwarding == -1) |
215 | options->allow_tcp_forwarding = 1; | |
1d1ffb87 | 216 | if (options->gateway_ports == -1) |
217 | options->gateway_ports = 0; | |
089fbbd2 | 218 | if (options->max_startups == -1) |
219 | options->max_startups = 10; | |
c345cf9d | 220 | if (options->max_startups_rate == -1) |
221 | options->max_startups_rate = 100; /* 100% */ | |
222 | if (options->max_startups_begin == -1) | |
223 | options->max_startups_begin = options->max_startups; | |
af4bd935 | 224 | if (options->max_authtries == -1) |
225 | options->max_authtries = DEFAULT_AUTH_FAIL_MAX; | |
c5a7d788 | 226 | if (options->use_dns == -1) |
227 | options->use_dns = 1; | |
3ffc6336 | 228 | if (options->client_alive_interval == -1) |
184eed6a | 229 | options->client_alive_interval = 0; |
3ffc6336 | 230 | if (options->client_alive_count_max == -1) |
231 | options->client_alive_count_max = 3; | |
5df83e07 | 232 | if (options->authorized_keys_file2 == NULL) { |
233 | /* authorized_keys_file2 falls back to authorized_keys_file */ | |
234 | if (options->authorized_keys_file != NULL) | |
235 | options->authorized_keys_file2 = options->authorized_keys_file; | |
236 | else | |
237 | options->authorized_keys_file2 = _PATH_SSH_USER_PERMITTED_KEYS2; | |
238 | } | |
239 | if (options->authorized_keys_file == NULL) | |
240 | options->authorized_keys_file = _PATH_SSH_USER_PERMITTED_KEYS; | |
d20f3c9e | 241 | if (options->permit_tun == -1) |
a4f24bf8 | 242 | options->permit_tun = SSH_TUNMODE_NO; |
1853d1ef | 243 | |
2ee1b704 | 244 | /* Turn privilege separation on by default */ |
1853d1ef | 245 | if (use_privsep == -1) |
2ee1b704 | 246 | use_privsep = 1; |
e299a298 | 247 | |
4165b82e | 248 | #ifndef HAVE_MMAP |
e299a298 | 249 | if (use_privsep && options->compression == 1) { |
250 | error("This platform does not support both privilege " | |
251 | "separation and compression"); | |
252 | error("Compression disabled"); | |
253 | options->compression = 0; | |
254 | } | |
255 | #endif | |
256 | ||
8efc0c15 | 257 | } |
258 | ||
8efc0c15 | 259 | /* Keyword tokens. */ |
5260325f | 260 | typedef enum { |
261 | sBadOption, /* == unknown option */ | |
e15895cd | 262 | /* Portable-specific options */ |
7fceb20d | 263 | sUsePAM, |
e15895cd | 264 | /* Standard Options */ |
5260325f | 265 | sPort, sHostKeyFile, sServerKeyBits, sLoginGraceTime, sKeyRegenerationTime, |
266 | sPermitRootLogin, sLogFacility, sLogLevel, | |
0598d99d | 267 | sRhostsRSAAuthentication, sRSAAuthentication, |
5260325f | 268 | sKerberosAuthentication, sKerberosOrLocalPasswd, sKerberosTicketCleanup, |
a1e30b47 | 269 | sKerberosGetAFSToken, |
1c590258 | 270 | sKerberosTgtPassing, sChallengeResponseAuthentication, |
31b41ceb | 271 | sPasswordAuthentication, sKbdInteractiveAuthentication, |
272 | sListenAddress, sAddressFamily, | |
4f4648f9 | 273 | sPrintMotd, sPrintLastLog, sIgnoreRhosts, |
e6e573bd | 274 | sX11Forwarding, sX11DisplayOffset, sX11UseLocalhost, |
fd573618 | 275 | sStrictModes, sEmptyPasswd, sTCPKeepAlive, |
f00bab84 | 276 | sPermitUserEnvironment, sUseLogin, sAllowTcpForwarding, sCompression, |
33de75a3 | 277 | sAllowUsers, sDenyUsers, sAllowGroups, sDenyGroups, |
b2552997 | 278 | sIgnoreUserKnownHosts, sCiphers, sMacs, sProtocol, sPidFile, |
af4bd935 | 279 | sGatewayPorts, sPubkeyAuthentication, sXAuthLocation, sSubsystem, |
280 | sMaxStartups, sMaxAuthTries, | |
c5a7d788 | 281 | sBanner, sUseDNS, sHostbasedAuthentication, |
184eed6a | 282 | sHostbasedUsesNameFromPacketOnly, sClientAliveInterval, |
c8445989 | 283 | sClientAliveCountMax, sAuthorizedKeysFile, sAuthorizedKeysFile2, |
d20f3c9e | 284 | sGssAuthentication, sGssCleanupCreds, sAcceptEnv, sPermitTunnel, |
2fefbadf | 285 | sMatch, sPermitOpen, |
2ea6de2b | 286 | sUsePrivilegeSeparation, |
a2144546 | 287 | sDeprecated, sUnsupported |
8efc0c15 | 288 | } ServerOpCodes; |
289 | ||
d231781a | 290 | #define SSHCFG_GLOBAL 0x01 /* allowed in main section of sshd_config */ |
291 | #define SSHCFG_MATCH 0x02 /* allowed inside a Match section */ | |
292 | #define SSHCFG_ALL (SSHCFG_GLOBAL|SSHCFG_MATCH) | |
293 | ||
8efc0c15 | 294 | /* Textual representation of the tokens. */ |
5260325f | 295 | static struct { |
296 | const char *name; | |
297 | ServerOpCodes opcode; | |
d231781a | 298 | u_int flags; |
5260325f | 299 | } keywords[] = { |
e15895cd | 300 | /* Portable-specific options */ |
b06b11ad | 301 | #ifdef USE_PAM |
d231781a | 302 | { "usepam", sUsePAM, SSHCFG_GLOBAL }, |
b06b11ad | 303 | #else |
d231781a | 304 | { "usepam", sUnsupported, SSHCFG_GLOBAL }, |
b06b11ad | 305 | #endif |
d231781a | 306 | { "pamauthenticationviakbdint", sDeprecated, SSHCFG_GLOBAL }, |
e15895cd | 307 | /* Standard Options */ |
d231781a | 308 | { "port", sPort, SSHCFG_GLOBAL }, |
309 | { "hostkey", sHostKeyFile, SSHCFG_GLOBAL }, | |
310 | { "hostdsakey", sHostKeyFile, SSHCFG_GLOBAL }, /* alias */ | |
311 | { "pidfile", sPidFile, SSHCFG_GLOBAL }, | |
312 | { "serverkeybits", sServerKeyBits, SSHCFG_GLOBAL }, | |
313 | { "logingracetime", sLoginGraceTime, SSHCFG_GLOBAL }, | |
314 | { "keyregenerationinterval", sKeyRegenerationTime, SSHCFG_GLOBAL }, | |
315 | { "permitrootlogin", sPermitRootLogin, SSHCFG_GLOBAL }, | |
316 | { "syslogfacility", sLogFacility, SSHCFG_GLOBAL }, | |
317 | { "loglevel", sLogLevel, SSHCFG_GLOBAL }, | |
318 | { "rhostsauthentication", sDeprecated, SSHCFG_GLOBAL }, | |
319 | { "rhostsrsaauthentication", sRhostsRSAAuthentication, SSHCFG_GLOBAL }, | |
320 | { "hostbasedauthentication", sHostbasedAuthentication, SSHCFG_GLOBAL }, | |
321 | { "hostbasedusesnamefrompacketonly", sHostbasedUsesNameFromPacketOnly, SSHCFG_GLOBAL }, | |
322 | { "rsaauthentication", sRSAAuthentication, SSHCFG_GLOBAL }, | |
323 | { "pubkeyauthentication", sPubkeyAuthentication, SSHCFG_GLOBAL }, | |
324 | { "dsaauthentication", sPubkeyAuthentication, SSHCFG_GLOBAL }, /* alias */ | |
1c590258 | 325 | #ifdef KRB5 |
d231781a | 326 | { "kerberosauthentication", sKerberosAuthentication, SSHCFG_GLOBAL }, |
327 | { "kerberosorlocalpasswd", sKerberosOrLocalPasswd, SSHCFG_GLOBAL }, | |
328 | { "kerberosticketcleanup", sKerberosTicketCleanup, SSHCFG_GLOBAL }, | |
bcfcc5f9 | 329 | #ifdef USE_AFS |
d231781a | 330 | { "kerberosgetafstoken", sKerberosGetAFSToken, SSHCFG_GLOBAL }, |
309af4e5 | 331 | #else |
d231781a | 332 | { "kerberosgetafstoken", sUnsupported, SSHCFG_GLOBAL }, |
309af4e5 | 333 | #endif |
a2144546 | 334 | #else |
d231781a | 335 | { "kerberosauthentication", sUnsupported, SSHCFG_GLOBAL }, |
336 | { "kerberosorlocalpasswd", sUnsupported, SSHCFG_GLOBAL }, | |
337 | { "kerberosticketcleanup", sUnsupported, SSHCFG_GLOBAL }, | |
338 | { "kerberosgetafstoken", sUnsupported, SSHCFG_GLOBAL }, | |
a2144546 | 339 | #endif |
d231781a | 340 | { "kerberostgtpassing", sUnsupported, SSHCFG_GLOBAL }, |
341 | { "afstokenpassing", sUnsupported, SSHCFG_GLOBAL }, | |
7364bd04 | 342 | #ifdef GSSAPI |
d231781a | 343 | { "gssapiauthentication", sGssAuthentication, SSHCFG_GLOBAL }, |
344 | { "gssapicleanupcredentials", sGssCleanupCreds, SSHCFG_GLOBAL }, | |
7364bd04 | 345 | #else |
d231781a | 346 | { "gssapiauthentication", sUnsupported, SSHCFG_GLOBAL }, |
347 | { "gssapicleanupcredentials", sUnsupported, SSHCFG_GLOBAL }, | |
7364bd04 | 348 | #endif |
d231781a | 349 | { "passwordauthentication", sPasswordAuthentication, SSHCFG_GLOBAL }, |
350 | { "kbdinteractiveauthentication", sKbdInteractiveAuthentication, SSHCFG_GLOBAL }, | |
351 | { "challengeresponseauthentication", sChallengeResponseAuthentication, SSHCFG_GLOBAL }, | |
352 | { "skeyauthentication", sChallengeResponseAuthentication, SSHCFG_GLOBAL }, /* alias */ | |
353 | { "checkmail", sDeprecated, SSHCFG_GLOBAL }, | |
354 | { "listenaddress", sListenAddress, SSHCFG_GLOBAL }, | |
355 | { "addressfamily", sAddressFamily, SSHCFG_GLOBAL }, | |
356 | { "printmotd", sPrintMotd, SSHCFG_GLOBAL }, | |
357 | { "printlastlog", sPrintLastLog, SSHCFG_GLOBAL }, | |
358 | { "ignorerhosts", sIgnoreRhosts, SSHCFG_GLOBAL }, | |
359 | { "ignoreuserknownhosts", sIgnoreUserKnownHosts, SSHCFG_GLOBAL }, | |
360 | { "x11forwarding", sX11Forwarding, SSHCFG_GLOBAL }, | |
361 | { "x11displayoffset", sX11DisplayOffset, SSHCFG_GLOBAL }, | |
362 | { "x11uselocalhost", sX11UseLocalhost, SSHCFG_GLOBAL }, | |
363 | { "xauthlocation", sXAuthLocation, SSHCFG_GLOBAL }, | |
364 | { "strictmodes", sStrictModes, SSHCFG_GLOBAL }, | |
365 | { "permitemptypasswords", sEmptyPasswd, SSHCFG_GLOBAL }, | |
366 | { "permituserenvironment", sPermitUserEnvironment, SSHCFG_GLOBAL }, | |
367 | { "uselogin", sUseLogin, SSHCFG_GLOBAL }, | |
368 | { "compression", sCompression, SSHCFG_GLOBAL }, | |
369 | { "tcpkeepalive", sTCPKeepAlive, SSHCFG_GLOBAL }, | |
370 | { "keepalive", sTCPKeepAlive, SSHCFG_GLOBAL }, /* obsolete alias */ | |
371 | { "allowtcpforwarding", sAllowTcpForwarding, SSHCFG_ALL }, | |
372 | { "allowusers", sAllowUsers, SSHCFG_GLOBAL }, | |
373 | { "denyusers", sDenyUsers, SSHCFG_GLOBAL }, | |
374 | { "allowgroups", sAllowGroups, SSHCFG_GLOBAL }, | |
375 | { "denygroups", sDenyGroups, SSHCFG_GLOBAL }, | |
376 | { "ciphers", sCiphers, SSHCFG_GLOBAL }, | |
377 | { "macs", sMacs, SSHCFG_GLOBAL }, | |
378 | { "protocol", sProtocol, SSHCFG_GLOBAL }, | |
379 | { "gatewayports", sGatewayPorts, SSHCFG_ALL }, | |
380 | { "subsystem", sSubsystem, SSHCFG_GLOBAL }, | |
381 | { "maxstartups", sMaxStartups, SSHCFG_GLOBAL }, | |
382 | { "maxauthtries", sMaxAuthTries, SSHCFG_GLOBAL }, | |
383 | { "banner", sBanner, SSHCFG_GLOBAL }, | |
384 | { "usedns", sUseDNS, SSHCFG_GLOBAL }, | |
385 | { "verifyreversemapping", sDeprecated, SSHCFG_GLOBAL }, | |
386 | { "reversemappingcheck", sDeprecated, SSHCFG_GLOBAL }, | |
387 | { "clientaliveinterval", sClientAliveInterval, SSHCFG_GLOBAL }, | |
388 | { "clientalivecountmax", sClientAliveCountMax, SSHCFG_GLOBAL }, | |
389 | { "authorizedkeysfile", sAuthorizedKeysFile, SSHCFG_GLOBAL }, | |
390 | { "authorizedkeysfile2", sAuthorizedKeysFile2, SSHCFG_GLOBAL }, | |
391 | { "useprivilegeseparation", sUsePrivilegeSeparation, SSHCFG_GLOBAL }, | |
392 | { "acceptenv", sAcceptEnv, SSHCFG_GLOBAL }, | |
393 | { "permittunnel", sPermitTunnel, SSHCFG_GLOBAL }, | |
2fefbadf | 394 | { "match", sMatch, SSHCFG_ALL }, |
395 | { "permitopen", sPermitOpen, SSHCFG_ALL }, | |
d231781a | 396 | { NULL, sBadOption, 0 } |
8efc0c15 | 397 | }; |
398 | ||
aa3378df | 399 | /* |
6be9a5e8 | 400 | * Returns the number of the token pointed to by cp or sBadOption. |
aa3378df | 401 | */ |
8efc0c15 | 402 | |
6ae2364d | 403 | static ServerOpCodes |
5260325f | 404 | parse_token(const char *cp, const char *filename, |
d231781a | 405 | int linenum, u_int *flags) |
8efc0c15 | 406 | { |
1e3b8b07 | 407 | u_int i; |
8efc0c15 | 408 | |
5260325f | 409 | for (i = 0; keywords[i].name; i++) |
d231781a | 410 | if (strcasecmp(cp, keywords[i].name) == 0) { |
411 | *flags = keywords[i].flags; | |
5260325f | 412 | return keywords[i].opcode; |
d231781a | 413 | } |
8efc0c15 | 414 | |
b7c70970 | 415 | error("%s: line %d: Bad configuration option: %s", |
416 | filename, linenum, cp); | |
5260325f | 417 | return sBadOption; |
8efc0c15 | 418 | } |
419 | ||
396c147e | 420 | static void |
2d2a2c65 | 421 | add_listen_addr(ServerOptions *options, char *addr, u_short port) |
48e671d5 | 422 | { |
2ceb8101 | 423 | u_int i; |
48e671d5 | 424 | |
425 | if (options->num_ports == 0) | |
426 | options->ports[options->num_ports++] = SSH_DEFAULT_PORT; | |
31b41ceb | 427 | if (options->address_family == -1) |
428 | options->address_family = AF_UNSPEC; | |
2d2a2c65 | 429 | if (port == 0) |
d11c1288 | 430 | for (i = 0; i < options->num_ports; i++) |
431 | add_one_listen_addr(options, addr, options->ports[i]); | |
432 | else | |
2d2a2c65 | 433 | add_one_listen_addr(options, addr, port); |
d11c1288 | 434 | } |
435 | ||
396c147e | 436 | static void |
d11c1288 | 437 | add_one_listen_addr(ServerOptions *options, char *addr, u_short port) |
438 | { | |
439 | struct addrinfo hints, *ai, *aitop; | |
440 | char strport[NI_MAXSERV]; | |
441 | int gaierr; | |
442 | ||
443 | memset(&hints, 0, sizeof(hints)); | |
31b41ceb | 444 | hints.ai_family = options->address_family; |
d11c1288 | 445 | hints.ai_socktype = SOCK_STREAM; |
446 | hints.ai_flags = (addr == NULL) ? AI_PASSIVE : 0; | |
7528d467 | 447 | snprintf(strport, sizeof strport, "%u", port); |
d11c1288 | 448 | if ((gaierr = getaddrinfo(addr, strport, &hints, &aitop)) != 0) |
449 | fatal("bad addr or host: %s (%s)", | |
450 | addr ? addr : "<NULL>", | |
451 | gai_strerror(gaierr)); | |
452 | for (ai = aitop; ai->ai_next; ai = ai->ai_next) | |
453 | ; | |
454 | ai->ai_next = options->listen_addrs; | |
455 | options->listen_addrs = aitop; | |
48e671d5 | 456 | } |
457 | ||
d231781a | 458 | /* |
459 | * The strategy for the Match blocks is that the config file is parsed twice. | |
460 | * | |
461 | * The first time is at startup. activep is initialized to 1 and the | |
462 | * directives in the global context are processed and acted on. Hitting a | |
463 | * Match directive unsets activep and the directives inside the block are | |
464 | * checked for syntax only. | |
465 | * | |
466 | * The second time is after a connection has been established but before | |
467 | * authentication. activep is initialized to 2 and global config directives | |
468 | * are ignored since they have already been processed. If the criteria in a | |
469 | * Match block is met, activep is set and the subsequent directives | |
470 | * processed and actioned until EOF or another Match block unsets it. Any | |
471 | * options set are copied into the main server config. | |
472 | * | |
473 | * Potential additions/improvements: | |
474 | * - Add Match support for pre-kex directives, eg Protocol, Ciphers. | |
475 | * | |
476 | * - Add a Tag directive (idea from David Leonard) ala pf, eg: | |
477 | * Match Address 192.168.0.* | |
478 | * Tag trusted | |
479 | * Match Group wheel | |
480 | * Tag trusted | |
481 | * Match Tag trusted | |
482 | * AllowTcpForwarding yes | |
483 | * GatewayPorts clientspecified | |
484 | * [...] | |
485 | * | |
486 | * - Add a PermittedChannelRequests directive | |
487 | * Match Group shell | |
488 | * PermittedChannelRequests session,forwarded-tcpip | |
489 | */ | |
490 | ||
491 | static int | |
492 | match_cfg_line(char **condition, int line, const char *user, const char *host, | |
493 | const char *address) | |
494 | { | |
495 | int result = 1; | |
496 | char *arg, *attrib, *cp = *condition; | |
497 | size_t len; | |
498 | ||
499 | if (user == NULL) | |
500 | debug3("checking syntax for 'Match %s'", cp); | |
501 | else | |
502 | debug3("checking match for '%s' user %s host %s addr %s", cp, | |
503 | user ? user : "(null)", host ? host : "(null)", | |
504 | address ? address : "(null)"); | |
505 | ||
506 | while ((attrib = strdelim(&cp)) && *attrib != '\0') { | |
507 | if ((arg = strdelim(&cp)) == NULL || *arg == '\0') { | |
508 | error("Missing Match criteria for %s", attrib); | |
509 | return -1; | |
510 | } | |
511 | len = strlen(arg); | |
512 | if (strcasecmp(attrib, "user") == 0) { | |
513 | if (!user) { | |
514 | result = 0; | |
515 | continue; | |
516 | } | |
517 | if (match_pattern_list(user, arg, len, 0) != 1) | |
518 | result = 0; | |
519 | else | |
520 | debug("user %.100s matched 'User %.100s' at " | |
521 | "line %d", user, arg, line); | |
522 | } else if (strcasecmp(attrib, "host") == 0) { | |
523 | if (!host) { | |
524 | result = 0; | |
525 | continue; | |
526 | } | |
527 | if (match_hostname(host, arg, len) != 1) | |
528 | result = 0; | |
529 | else | |
530 | debug("connection from %.100s matched 'Host " | |
531 | "%.100s' at line %d", host, arg, line); | |
532 | } else if (strcasecmp(attrib, "address") == 0) { | |
533 | debug("address '%s' arg '%s'", address, arg); | |
534 | if (!address) { | |
535 | result = 0; | |
536 | continue; | |
537 | } | |
538 | if (match_hostname(address, arg, len) != 1) | |
539 | result = 0; | |
540 | else | |
541 | debug("connection from %.100s matched 'Address " | |
542 | "%.100s' at line %d", address, arg, line); | |
543 | } else { | |
544 | error("Unsupported Match attribute %s", attrib); | |
545 | return -1; | |
546 | } | |
547 | } | |
548 | if (user != NULL) | |
549 | debug3("match %sfound", result ? "" : "not "); | |
550 | *condition = cp; | |
551 | return result; | |
552 | } | |
553 | ||
2717fa0f | 554 | int |
555 | process_server_config_line(ServerOptions *options, char *line, | |
d231781a | 556 | const char *filename, int linenum, int *activep, const char *user, |
557 | const char *host, const char *address) | |
8efc0c15 | 558 | { |
d11c1288 | 559 | char *cp, **charptr, *arg, *p; |
d231781a | 560 | int cmdline = 0, *intptr, value, n; |
5260325f | 561 | ServerOpCodes opcode; |
3867aa0a | 562 | u_short port; |
d231781a | 563 | u_int i, flags = 0; |
d66ce1a1 | 564 | size_t len; |
5260325f | 565 | |
2717fa0f | 566 | cp = line; |
0f8cd5a6 | 567 | if ((arg = strdelim(&cp)) == NULL) |
88299971 | 568 | return 0; |
2717fa0f | 569 | /* Ignore leading whitespace */ |
570 | if (*arg == '\0') | |
704b1659 | 571 | arg = strdelim(&cp); |
2717fa0f | 572 | if (!arg || !*arg || *arg == '#') |
573 | return 0; | |
574 | intptr = NULL; | |
575 | charptr = NULL; | |
d231781a | 576 | opcode = parse_token(arg, filename, linenum, &flags); |
577 | ||
578 | if (activep == NULL) { /* We are processing a command line directive */ | |
579 | cmdline = 1; | |
580 | activep = &cmdline; | |
581 | } | |
582 | if (*activep && opcode != sMatch) | |
583 | debug3("%s:%d setting %s %s", filename, linenum, arg, cp); | |
584 | if (*activep == 0 && !(flags & SSHCFG_MATCH)) { | |
585 | if (user == NULL) { | |
586 | fatal("%s line %d: Directive '%s' is not allowed " | |
587 | "within a Match block", filename, linenum, arg); | |
588 | } else { /* this is a directive we have already processed */ | |
589 | while (arg) | |
590 | arg = strdelim(&cp); | |
591 | return 0; | |
592 | } | |
593 | } | |
594 | ||
2717fa0f | 595 | switch (opcode) { |
596 | /* Portable-specific options */ | |
7fceb20d | 597 | case sUsePAM: |
598 | intptr = &options->use_pam; | |
2717fa0f | 599 | goto parse_flag; |
48e671d5 | 600 | |
2717fa0f | 601 | /* Standard Options */ |
602 | case sBadOption: | |
603 | return -1; | |
604 | case sPort: | |
605 | /* ignore ports from configfile if cmdline specifies ports */ | |
606 | if (options->ports_from_cmdline) | |
607 | return 0; | |
608 | if (options->listen_addrs != NULL) | |
609 | fatal("%s line %d: ports must be specified before " | |
3a454b6a | 610 | "ListenAddress.", filename, linenum); |
2717fa0f | 611 | if (options->num_ports >= MAX_PORTS) |
612 | fatal("%s line %d: too many ports.", | |
613 | filename, linenum); | |
614 | arg = strdelim(&cp); | |
615 | if (!arg || *arg == '\0') | |
616 | fatal("%s line %d: missing port number.", | |
617 | filename, linenum); | |
618 | options->ports[options->num_ports++] = a2port(arg); | |
619 | if (options->ports[options->num_ports-1] == 0) | |
620 | fatal("%s line %d: Badly formatted port number.", | |
621 | filename, linenum); | |
622 | break; | |
623 | ||
624 | case sServerKeyBits: | |
625 | intptr = &options->server_key_bits; | |
5260325f | 626 | parse_int: |
2717fa0f | 627 | arg = strdelim(&cp); |
628 | if (!arg || *arg == '\0') | |
629 | fatal("%s line %d: missing integer value.", | |
630 | filename, linenum); | |
631 | value = atoi(arg); | |
d231781a | 632 | if (*activep && *intptr == -1) |
2717fa0f | 633 | *intptr = value; |
634 | break; | |
635 | ||
636 | case sLoginGraceTime: | |
637 | intptr = &options->login_grace_time; | |
e2b1fb42 | 638 | parse_time: |
2717fa0f | 639 | arg = strdelim(&cp); |
640 | if (!arg || *arg == '\0') | |
641 | fatal("%s line %d: missing time value.", | |
642 | filename, linenum); | |
643 | if ((value = convtime(arg)) == -1) | |
644 | fatal("%s line %d: invalid time value.", | |
645 | filename, linenum); | |
646 | if (*intptr == -1) | |
647 | *intptr = value; | |
648 | break; | |
649 | ||
650 | case sKeyRegenerationTime: | |
651 | intptr = &options->key_regeneration_time; | |
652 | goto parse_time; | |
653 | ||
654 | case sListenAddress: | |
655 | arg = strdelim(&cp); | |
3867aa0a | 656 | if (arg == NULL || *arg == '\0') |
657 | fatal("%s line %d: missing address", | |
2717fa0f | 658 | filename, linenum); |
91135a0e | 659 | /* check for bare IPv6 address: no "[]" and 2 or more ":" */ |
660 | if (strchr(arg, '[') == NULL && (p = strchr(arg, ':')) != NULL | |
661 | && strchr(p+1, ':') != NULL) { | |
662 | add_listen_addr(options, arg, 0); | |
663 | break; | |
664 | } | |
3867aa0a | 665 | p = hpdelim(&arg); |
666 | if (p == NULL) | |
667 | fatal("%s line %d: bad address:port usage", | |
2717fa0f | 668 | filename, linenum); |
3867aa0a | 669 | p = cleanhostname(p); |
670 | if (arg == NULL) | |
671 | port = 0; | |
672 | else if ((port = a2port(arg)) == 0) | |
673 | fatal("%s line %d: bad port number", filename, linenum); | |
674 | ||
675 | add_listen_addr(options, p, port); | |
676 | ||
2717fa0f | 677 | break; |
678 | ||
31b41ceb | 679 | case sAddressFamily: |
680 | arg = strdelim(&cp); | |
38634ff6 | 681 | if (!arg || *arg == '\0') |
682 | fatal("%s line %d: missing address family.", | |
683 | filename, linenum); | |
31b41ceb | 684 | intptr = &options->address_family; |
685 | if (options->listen_addrs != NULL) | |
686 | fatal("%s line %d: address family must be specified before " | |
687 | "ListenAddress.", filename, linenum); | |
688 | if (strcasecmp(arg, "inet") == 0) | |
689 | value = AF_INET; | |
690 | else if (strcasecmp(arg, "inet6") == 0) | |
691 | value = AF_INET6; | |
692 | else if (strcasecmp(arg, "any") == 0) | |
693 | value = AF_UNSPEC; | |
694 | else | |
695 | fatal("%s line %d: unsupported address family \"%s\".", | |
696 | filename, linenum, arg); | |
697 | if (*intptr == -1) | |
698 | *intptr = value; | |
699 | break; | |
700 | ||
2717fa0f | 701 | case sHostKeyFile: |
702 | intptr = &options->num_host_key_files; | |
703 | if (*intptr >= MAX_HOSTKEYS) | |
704 | fatal("%s line %d: too many host keys specified (max %d).", | |
705 | filename, linenum, MAX_HOSTKEYS); | |
706 | charptr = &options->host_key_files[*intptr]; | |
fa649821 | 707 | parse_filename: |
2717fa0f | 708 | arg = strdelim(&cp); |
709 | if (!arg || *arg == '\0') | |
710 | fatal("%s line %d: missing file name.", | |
711 | filename, linenum); | |
d231781a | 712 | if (*activep && *charptr == NULL) { |
2717fa0f | 713 | *charptr = tilde_expand_filename(arg, getuid()); |
714 | /* increase optional counter */ | |
715 | if (intptr != NULL) | |
716 | *intptr = *intptr + 1; | |
717 | } | |
718 | break; | |
0fbe8c74 | 719 | |
2717fa0f | 720 | case sPidFile: |
721 | charptr = &options->pid_file; | |
722 | goto parse_filename; | |
5260325f | 723 | |
2717fa0f | 724 | case sPermitRootLogin: |
725 | intptr = &options->permit_root_login; | |
726 | arg = strdelim(&cp); | |
727 | if (!arg || *arg == '\0') | |
728 | fatal("%s line %d: missing yes/" | |
729 | "without-password/forced-commands-only/no " | |
730 | "argument.", filename, linenum); | |
731 | value = 0; /* silence compiler */ | |
732 | if (strcmp(arg, "without-password") == 0) | |
733 | value = PERMIT_NO_PASSWD; | |
734 | else if (strcmp(arg, "forced-commands-only") == 0) | |
735 | value = PERMIT_FORCED_ONLY; | |
736 | else if (strcmp(arg, "yes") == 0) | |
737 | value = PERMIT_YES; | |
738 | else if (strcmp(arg, "no") == 0) | |
739 | value = PERMIT_NO; | |
740 | else | |
741 | fatal("%s line %d: Bad yes/" | |
742 | "without-password/forced-commands-only/no " | |
743 | "argument: %s", filename, linenum, arg); | |
744 | if (*intptr == -1) | |
745 | *intptr = value; | |
746 | break; | |
747 | ||
748 | case sIgnoreRhosts: | |
749 | intptr = &options->ignore_rhosts; | |
5260325f | 750 | parse_flag: |
2717fa0f | 751 | arg = strdelim(&cp); |
752 | if (!arg || *arg == '\0') | |
753 | fatal("%s line %d: missing yes/no argument.", | |
754 | filename, linenum); | |
755 | value = 0; /* silence compiler */ | |
756 | if (strcmp(arg, "yes") == 0) | |
757 | value = 1; | |
758 | else if (strcmp(arg, "no") == 0) | |
759 | value = 0; | |
760 | else | |
761 | fatal("%s line %d: Bad yes/no argument: %s", | |
762 | filename, linenum, arg); | |
d231781a | 763 | if (*activep && *intptr == -1) |
2717fa0f | 764 | *intptr = value; |
765 | break; | |
766 | ||
767 | case sIgnoreUserKnownHosts: | |
768 | intptr = &options->ignore_user_known_hosts; | |
769 | goto parse_flag; | |
770 | ||
2717fa0f | 771 | case sRhostsRSAAuthentication: |
772 | intptr = &options->rhosts_rsa_authentication; | |
773 | goto parse_flag; | |
774 | ||
775 | case sHostbasedAuthentication: | |
776 | intptr = &options->hostbased_authentication; | |
777 | goto parse_flag; | |
778 | ||
779 | case sHostbasedUsesNameFromPacketOnly: | |
780 | intptr = &options->hostbased_uses_name_from_packet_only; | |
781 | goto parse_flag; | |
782 | ||
783 | case sRSAAuthentication: | |
784 | intptr = &options->rsa_authentication; | |
785 | goto parse_flag; | |
786 | ||
787 | case sPubkeyAuthentication: | |
788 | intptr = &options->pubkey_authentication; | |
789 | goto parse_flag; | |
d0ec7f42 | 790 | |
2717fa0f | 791 | case sKerberosAuthentication: |
792 | intptr = &options->kerberos_authentication; | |
793 | goto parse_flag; | |
5260325f | 794 | |
2717fa0f | 795 | case sKerberosOrLocalPasswd: |
796 | intptr = &options->kerberos_or_local_passwd; | |
797 | goto parse_flag; | |
5260325f | 798 | |
2717fa0f | 799 | case sKerberosTicketCleanup: |
800 | intptr = &options->kerberos_ticket_cleanup; | |
801 | goto parse_flag; | |
d0ec7f42 | 802 | |
a1e30b47 | 803 | case sKerberosGetAFSToken: |
804 | intptr = &options->kerberos_get_afs_token; | |
805 | goto parse_flag; | |
806 | ||
7364bd04 | 807 | case sGssAuthentication: |
808 | intptr = &options->gss_authentication; | |
809 | goto parse_flag; | |
810 | ||
811 | case sGssCleanupCreds: | |
812 | intptr = &options->gss_cleanup_creds; | |
813 | goto parse_flag; | |
814 | ||
2717fa0f | 815 | case sPasswordAuthentication: |
816 | intptr = &options->password_authentication; | |
817 | goto parse_flag; | |
5260325f | 818 | |
2717fa0f | 819 | case sKbdInteractiveAuthentication: |
820 | intptr = &options->kbd_interactive_authentication; | |
821 | goto parse_flag; | |
8002af61 | 822 | |
2717fa0f | 823 | case sChallengeResponseAuthentication: |
824 | intptr = &options->challenge_response_authentication; | |
825 | goto parse_flag; | |
8002af61 | 826 | |
2717fa0f | 827 | case sPrintMotd: |
828 | intptr = &options->print_motd; | |
829 | goto parse_flag; | |
5260325f | 830 | |
2717fa0f | 831 | case sPrintLastLog: |
832 | intptr = &options->print_lastlog; | |
833 | goto parse_flag; | |
5260325f | 834 | |
2717fa0f | 835 | case sX11Forwarding: |
836 | intptr = &options->x11_forwarding; | |
837 | goto parse_flag; | |
5260325f | 838 | |
2717fa0f | 839 | case sX11DisplayOffset: |
840 | intptr = &options->x11_display_offset; | |
841 | goto parse_int; | |
8efc0c15 | 842 | |
e6e573bd | 843 | case sX11UseLocalhost: |
844 | intptr = &options->x11_use_localhost; | |
845 | goto parse_flag; | |
846 | ||
2717fa0f | 847 | case sXAuthLocation: |
848 | charptr = &options->xauth_location; | |
849 | goto parse_filename; | |
5260325f | 850 | |
2717fa0f | 851 | case sStrictModes: |
852 | intptr = &options->strict_modes; | |
853 | goto parse_flag; | |
5260325f | 854 | |
fd573618 | 855 | case sTCPKeepAlive: |
856 | intptr = &options->tcp_keep_alive; | |
2717fa0f | 857 | goto parse_flag; |
33de75a3 | 858 | |
2717fa0f | 859 | case sEmptyPasswd: |
860 | intptr = &options->permit_empty_passwd; | |
861 | goto parse_flag; | |
5260325f | 862 | |
f00bab84 | 863 | case sPermitUserEnvironment: |
864 | intptr = &options->permit_user_env; | |
865 | goto parse_flag; | |
866 | ||
2717fa0f | 867 | case sUseLogin: |
868 | intptr = &options->use_login; | |
869 | goto parse_flag; | |
5260325f | 870 | |
636f76ca | 871 | case sCompression: |
872 | intptr = &options->compression; | |
07200973 | 873 | arg = strdelim(&cp); |
874 | if (!arg || *arg == '\0') | |
875 | fatal("%s line %d: missing yes/no/delayed " | |
876 | "argument.", filename, linenum); | |
877 | value = 0; /* silence compiler */ | |
878 | if (strcmp(arg, "delayed") == 0) | |
879 | value = COMP_DELAYED; | |
880 | else if (strcmp(arg, "yes") == 0) | |
881 | value = COMP_ZLIB; | |
882 | else if (strcmp(arg, "no") == 0) | |
883 | value = COMP_NONE; | |
884 | else | |
885 | fatal("%s line %d: Bad yes/no/delayed " | |
886 | "argument: %s", filename, linenum, arg); | |
887 | if (*intptr == -1) | |
888 | *intptr = value; | |
889 | break; | |
636f76ca | 890 | |
2717fa0f | 891 | case sGatewayPorts: |
892 | intptr = &options->gateway_ports; | |
3867aa0a | 893 | arg = strdelim(&cp); |
894 | if (!arg || *arg == '\0') | |
895 | fatal("%s line %d: missing yes/no/clientspecified " | |
896 | "argument.", filename, linenum); | |
897 | value = 0; /* silence compiler */ | |
898 | if (strcmp(arg, "clientspecified") == 0) | |
899 | value = 2; | |
900 | else if (strcmp(arg, "yes") == 0) | |
901 | value = 1; | |
902 | else if (strcmp(arg, "no") == 0) | |
903 | value = 0; | |
904 | else | |
905 | fatal("%s line %d: Bad yes/no/clientspecified " | |
906 | "argument: %s", filename, linenum, arg); | |
907 | if (*intptr == -1) | |
908 | *intptr = value; | |
909 | break; | |
5260325f | 910 | |
c5a7d788 | 911 | case sUseDNS: |
912 | intptr = &options->use_dns; | |
2717fa0f | 913 | goto parse_flag; |
5260325f | 914 | |
2717fa0f | 915 | case sLogFacility: |
916 | intptr = (int *) &options->log_facility; | |
917 | arg = strdelim(&cp); | |
918 | value = log_facility_number(arg); | |
5eaf8578 | 919 | if (value == SYSLOG_FACILITY_NOT_SET) |
2717fa0f | 920 | fatal("%.200s line %d: unsupported log facility '%s'", |
921 | filename, linenum, arg ? arg : "<NONE>"); | |
922 | if (*intptr == -1) | |
923 | *intptr = (SyslogFacility) value; | |
924 | break; | |
925 | ||
926 | case sLogLevel: | |
927 | intptr = (int *) &options->log_level; | |
928 | arg = strdelim(&cp); | |
929 | value = log_level_number(arg); | |
5eaf8578 | 930 | if (value == SYSLOG_LEVEL_NOT_SET) |
2717fa0f | 931 | fatal("%.200s line %d: unsupported log level '%s'", |
932 | filename, linenum, arg ? arg : "<NONE>"); | |
933 | if (*intptr == -1) | |
934 | *intptr = (LogLevel) value; | |
935 | break; | |
936 | ||
937 | case sAllowTcpForwarding: | |
938 | intptr = &options->allow_tcp_forwarding; | |
939 | goto parse_flag; | |
940 | ||
1853d1ef | 941 | case sUsePrivilegeSeparation: |
942 | intptr = &use_privsep; | |
943 | goto parse_flag; | |
944 | ||
2717fa0f | 945 | case sAllowUsers: |
946 | while ((arg = strdelim(&cp)) && *arg != '\0') { | |
947 | if (options->num_allow_users >= MAX_ALLOW_USERS) | |
948 | fatal("%s line %d: too many allow users.", | |
949 | filename, linenum); | |
7528d467 | 950 | options->allow_users[options->num_allow_users++] = |
951 | xstrdup(arg); | |
2717fa0f | 952 | } |
953 | break; | |
a8be9f80 | 954 | |
2717fa0f | 955 | case sDenyUsers: |
956 | while ((arg = strdelim(&cp)) && *arg != '\0') { | |
957 | if (options->num_deny_users >= MAX_DENY_USERS) | |
958 | fatal( "%s line %d: too many deny users.", | |
959 | filename, linenum); | |
7528d467 | 960 | options->deny_users[options->num_deny_users++] = |
961 | xstrdup(arg); | |
2717fa0f | 962 | } |
963 | break; | |
b2552997 | 964 | |
2717fa0f | 965 | case sAllowGroups: |
966 | while ((arg = strdelim(&cp)) && *arg != '\0') { | |
967 | if (options->num_allow_groups >= MAX_ALLOW_GROUPS) | |
968 | fatal("%s line %d: too many allow groups.", | |
969 | filename, linenum); | |
7528d467 | 970 | options->allow_groups[options->num_allow_groups++] = |
971 | xstrdup(arg); | |
2717fa0f | 972 | } |
973 | break; | |
a8be9f80 | 974 | |
2717fa0f | 975 | case sDenyGroups: |
976 | while ((arg = strdelim(&cp)) && *arg != '\0') { | |
977 | if (options->num_deny_groups >= MAX_DENY_GROUPS) | |
978 | fatal("%s line %d: too many deny groups.", | |
979 | filename, linenum); | |
980 | options->deny_groups[options->num_deny_groups++] = xstrdup(arg); | |
981 | } | |
982 | break; | |
38c295d6 | 983 | |
2717fa0f | 984 | case sCiphers: |
985 | arg = strdelim(&cp); | |
986 | if (!arg || *arg == '\0') | |
987 | fatal("%s line %d: Missing argument.", filename, linenum); | |
988 | if (!ciphers_valid(arg)) | |
989 | fatal("%s line %d: Bad SSH2 cipher spec '%s'.", | |
990 | filename, linenum, arg ? arg : "<NONE>"); | |
991 | if (options->ciphers == NULL) | |
992 | options->ciphers = xstrdup(arg); | |
993 | break; | |
994 | ||
995 | case sMacs: | |
996 | arg = strdelim(&cp); | |
997 | if (!arg || *arg == '\0') | |
998 | fatal("%s line %d: Missing argument.", filename, linenum); | |
999 | if (!mac_valid(arg)) | |
1000 | fatal("%s line %d: Bad SSH2 mac spec '%s'.", | |
1001 | filename, linenum, arg ? arg : "<NONE>"); | |
1002 | if (options->macs == NULL) | |
1003 | options->macs = xstrdup(arg); | |
1004 | break; | |
1005 | ||
1006 | case sProtocol: | |
1007 | intptr = &options->protocol; | |
1008 | arg = strdelim(&cp); | |
1009 | if (!arg || *arg == '\0') | |
1010 | fatal("%s line %d: Missing argument.", filename, linenum); | |
1011 | value = proto_spec(arg); | |
1012 | if (value == SSH_PROTO_UNKNOWN) | |
1013 | fatal("%s line %d: Bad protocol spec '%s'.", | |
184eed6a | 1014 | filename, linenum, arg ? arg : "<NONE>"); |
2717fa0f | 1015 | if (*intptr == SSH_PROTO_UNKNOWN) |
1016 | *intptr = value; | |
1017 | break; | |
1018 | ||
1019 | case sSubsystem: | |
1020 | if (options->num_subsystems >= MAX_SUBSYSTEMS) { | |
1021 | fatal("%s line %d: too many subsystems defined.", | |
184eed6a | 1022 | filename, linenum); |
2717fa0f | 1023 | } |
1024 | arg = strdelim(&cp); | |
1025 | if (!arg || *arg == '\0') | |
1026 | fatal("%s line %d: Missing subsystem name.", | |
184eed6a | 1027 | filename, linenum); |
d231781a | 1028 | if (!*activep) { |
1029 | arg = strdelim(&cp); | |
1030 | break; | |
1031 | } | |
2717fa0f | 1032 | for (i = 0; i < options->num_subsystems; i++) |
1033 | if (strcmp(arg, options->subsystem_name[i]) == 0) | |
1034 | fatal("%s line %d: Subsystem '%s' already defined.", | |
184eed6a | 1035 | filename, linenum, arg); |
2717fa0f | 1036 | options->subsystem_name[options->num_subsystems] = xstrdup(arg); |
1037 | arg = strdelim(&cp); | |
1038 | if (!arg || *arg == '\0') | |
1039 | fatal("%s line %d: Missing subsystem command.", | |
184eed6a | 1040 | filename, linenum); |
2717fa0f | 1041 | options->subsystem_command[options->num_subsystems] = xstrdup(arg); |
d66ce1a1 | 1042 | |
1043 | /* Collect arguments (separate to executable) */ | |
1044 | p = xstrdup(arg); | |
1045 | len = strlen(p) + 1; | |
1046 | while ((arg = strdelim(&cp)) != NULL && *arg != '\0') { | |
1047 | len += 1 + strlen(arg); | |
1048 | p = xrealloc(p, 1, len); | |
1049 | strlcat(p, " ", len); | |
1050 | strlcat(p, arg, len); | |
1051 | } | |
1052 | options->subsystem_args[options->num_subsystems] = p; | |
2717fa0f | 1053 | options->num_subsystems++; |
1054 | break; | |
1055 | ||
1056 | case sMaxStartups: | |
1057 | arg = strdelim(&cp); | |
1058 | if (!arg || *arg == '\0') | |
1059 | fatal("%s line %d: Missing MaxStartups spec.", | |
184eed6a | 1060 | filename, linenum); |
2717fa0f | 1061 | if ((n = sscanf(arg, "%d:%d:%d", |
1062 | &options->max_startups_begin, | |
1063 | &options->max_startups_rate, | |
1064 | &options->max_startups)) == 3) { | |
1065 | if (options->max_startups_begin > | |
1066 | options->max_startups || | |
1067 | options->max_startups_rate > 100 || | |
1068 | options->max_startups_rate < 1) | |
c345cf9d | 1069 | fatal("%s line %d: Illegal MaxStartups spec.", |
97de229c | 1070 | filename, linenum); |
2717fa0f | 1071 | } else if (n != 1) |
1072 | fatal("%s line %d: Illegal MaxStartups spec.", | |
1073 | filename, linenum); | |
1074 | else | |
1075 | options->max_startups = options->max_startups_begin; | |
1076 | break; | |
1077 | ||
af4bd935 | 1078 | case sMaxAuthTries: |
1079 | intptr = &options->max_authtries; | |
1080 | goto parse_int; | |
1081 | ||
2717fa0f | 1082 | case sBanner: |
1083 | charptr = &options->banner; | |
1084 | goto parse_filename; | |
1085 | /* | |
1086 | * These options can contain %X options expanded at | |
1087 | * connect time, so that you can specify paths like: | |
1088 | * | |
1089 | * AuthorizedKeysFile /etc/ssh_keys/%u | |
1090 | */ | |
1091 | case sAuthorizedKeysFile: | |
1092 | case sAuthorizedKeysFile2: | |
1093 | charptr = (opcode == sAuthorizedKeysFile ) ? | |
1094 | &options->authorized_keys_file : | |
1095 | &options->authorized_keys_file2; | |
1096 | goto parse_filename; | |
1097 | ||
1098 | case sClientAliveInterval: | |
1099 | intptr = &options->client_alive_interval; | |
1100 | goto parse_time; | |
1101 | ||
1102 | case sClientAliveCountMax: | |
1103 | intptr = &options->client_alive_count_max; | |
1104 | goto parse_int; | |
1105 | ||
61a2c1da | 1106 | case sAcceptEnv: |
1107 | while ((arg = strdelim(&cp)) && *arg != '\0') { | |
1108 | if (strchr(arg, '=') != NULL) | |
1109 | fatal("%s line %d: Invalid environment name.", | |
1110 | filename, linenum); | |
1111 | if (options->num_accept_env >= MAX_ACCEPT_ENV) | |
1112 | fatal("%s line %d: too many allow env.", | |
1113 | filename, linenum); | |
d231781a | 1114 | if (!*activep) |
1115 | break; | |
61a2c1da | 1116 | options->accept_env[options->num_accept_env++] = |
1117 | xstrdup(arg); | |
1118 | } | |
1119 | break; | |
1120 | ||
d20f3c9e | 1121 | case sPermitTunnel: |
1122 | intptr = &options->permit_tun; | |
a4f24bf8 | 1123 | arg = strdelim(&cp); |
1124 | if (!arg || *arg == '\0') | |
1125 | fatal("%s line %d: Missing yes/point-to-point/" | |
1126 | "ethernet/no argument.", filename, linenum); | |
1127 | value = 0; /* silence compiler */ | |
1128 | if (strcasecmp(arg, "ethernet") == 0) | |
1129 | value = SSH_TUNMODE_ETHERNET; | |
1130 | else if (strcasecmp(arg, "point-to-point") == 0) | |
1131 | value = SSH_TUNMODE_POINTOPOINT; | |
1132 | else if (strcasecmp(arg, "yes") == 0) | |
1133 | value = SSH_TUNMODE_YES; | |
1134 | else if (strcasecmp(arg, "no") == 0) | |
1135 | value = SSH_TUNMODE_NO; | |
1136 | else | |
1137 | fatal("%s line %d: Bad yes/point-to-point/ethernet/" | |
1138 | "no argument: %s", filename, linenum, arg); | |
1139 | if (*intptr == -1) | |
1140 | *intptr = value; | |
1141 | break; | |
d20f3c9e | 1142 | |
d231781a | 1143 | case sMatch: |
1144 | if (cmdline) | |
1145 | fatal("Match directive not supported as a command-line " | |
1146 | "option"); | |
1147 | value = match_cfg_line(&cp, linenum, user, host, address); | |
1148 | if (value < 0) | |
1149 | fatal("%s line %d: Bad Match condition", filename, | |
1150 | linenum); | |
1151 | *activep = value; | |
1152 | break; | |
1153 | ||
2fefbadf | 1154 | case sPermitOpen: |
1155 | arg = strdelim(&cp); | |
1156 | if (!arg || *arg == '\0') | |
1157 | fatal("%s line %d: missing PermitOpen specification", | |
1158 | filename, linenum); | |
1159 | if (strcmp(arg, "any") == 0) { | |
1160 | if (*activep) | |
1161 | channel_clear_adm_permitted_opens(); | |
1162 | break; | |
1163 | } | |
1164 | p = hpdelim(&arg); | |
1165 | if (p == NULL) | |
1166 | fatal("%s line %d: missing host in PermitOpen", | |
1167 | filename, linenum); | |
1168 | p = cleanhostname(p); | |
1169 | if (arg == NULL || (port = a2port(arg)) == 0) | |
1170 | fatal("%s line %d: bad port number in PermitOpen", | |
1171 | filename, linenum); | |
1172 | if (*activep) | |
1173 | channel_add_adm_permitted_opens(p, port); | |
1174 | break; | |
1175 | ||
2717fa0f | 1176 | case sDeprecated: |
bbe88b6d | 1177 | logit("%s line %d: Deprecated option %s", |
2717fa0f | 1178 | filename, linenum, arg); |
1179 | while (arg) | |
1180 | arg = strdelim(&cp); | |
1181 | break; | |
1182 | ||
a2144546 | 1183 | case sUnsupported: |
1184 | logit("%s line %d: Unsupported option %s", | |
1185 | filename, linenum, arg); | |
1186 | while (arg) | |
1187 | arg = strdelim(&cp); | |
1188 | break; | |
1189 | ||
2717fa0f | 1190 | default: |
1191 | fatal("%s line %d: Missing handler for opcode %s (%d)", | |
1192 | filename, linenum, arg, opcode); | |
1193 | } | |
1194 | if ((arg = strdelim(&cp)) != NULL && *arg != '\0') | |
1195 | fatal("%s line %d: garbage at end of line; \"%.200s\".", | |
1196 | filename, linenum, arg); | |
1197 | return 0; | |
1198 | } | |
089fbbd2 | 1199 | |
2717fa0f | 1200 | /* Reads the server configuration file. */ |
5c53a31e | 1201 | |
2717fa0f | 1202 | void |
b9a549d7 | 1203 | load_server_config(const char *filename, Buffer *conf) |
2717fa0f | 1204 | { |
b9a549d7 | 1205 | char line[1024], *cp; |
7528d467 | 1206 | FILE *f; |
2717fa0f | 1207 | |
b9a549d7 | 1208 | debug2("%s: filename %s", __func__, filename); |
1209 | if ((f = fopen(filename, "r")) == NULL) { | |
2717fa0f | 1210 | perror(filename); |
1211 | exit(1); | |
1212 | } | |
b9a549d7 | 1213 | buffer_clear(conf); |
2717fa0f | 1214 | while (fgets(line, sizeof(line), f)) { |
b9a549d7 | 1215 | /* |
1216 | * Trim out comments and strip whitespace | |
f2107e97 | 1217 | * NB - preserve newlines, they are needed to reproduce |
b9a549d7 | 1218 | * line numbers later for error messages |
1219 | */ | |
1220 | if ((cp = strchr(line, '#')) != NULL) | |
1221 | memcpy(cp, "\n", 2); | |
1222 | cp = line + strspn(line, " \t\r"); | |
1223 | ||
1224 | buffer_append(conf, cp, strlen(cp)); | |
8efc0c15 | 1225 | } |
b9a549d7 | 1226 | buffer_append(conf, "\0", 1); |
5260325f | 1227 | fclose(f); |
b9a549d7 | 1228 | debug2("%s: done config len = %d", __func__, buffer_len(conf)); |
1229 | } | |
1230 | ||
1231 | void | |
d231781a | 1232 | parse_server_match_config(ServerOptions *options, const char *user, |
1233 | const char *host, const char *address) | |
1234 | { | |
1235 | ServerOptions mo; | |
1236 | ||
1237 | initialize_server_options(&mo); | |
1238 | parse_server_config(&mo, "reprocess config", &cfg, user, host, address); | |
1239 | copy_set_server_options(options, &mo); | |
1240 | } | |
1241 | ||
1242 | /* Copy any (supported) values that are set */ | |
1243 | void | |
1244 | copy_set_server_options(ServerOptions *dst, ServerOptions *src) | |
1245 | { | |
1246 | if (src->allow_tcp_forwarding != -1) | |
1247 | dst->allow_tcp_forwarding = src->allow_tcp_forwarding; | |
1248 | if (src->gateway_ports != -1) | |
1249 | dst->gateway_ports = src->gateway_ports; | |
1250 | } | |
1251 | ||
1252 | void | |
1253 | parse_server_config(ServerOptions *options, const char *filename, Buffer *conf, | |
1254 | const char *user, const char *host, const char *address) | |
b9a549d7 | 1255 | { |
d231781a | 1256 | int active, linenum, bad_options = 0; |
16acb158 | 1257 | char *cp, *obuf, *cbuf; |
b9a549d7 | 1258 | |
1259 | debug2("%s: config %s len %d", __func__, filename, buffer_len(conf)); | |
1260 | ||
16acb158 | 1261 | obuf = cbuf = xstrdup(buffer_ptr(conf)); |
d231781a | 1262 | active = user ? 0 : 1; |
861cc543 | 1263 | linenum = 1; |
f8cc7664 | 1264 | while ((cp = strsep(&cbuf, "\n")) != NULL) { |
b9a549d7 | 1265 | if (process_server_config_line(options, cp, filename, |
d231781a | 1266 | linenum++, &active, user, host, address) != 0) |
b9a549d7 | 1267 | bad_options++; |
1268 | } | |
16acb158 | 1269 | xfree(obuf); |
b7c70970 | 1270 | if (bad_options > 0) |
1271 | fatal("%s: terminating, %d bad configuration options", | |
1272 | filename, bad_options); | |
8efc0c15 | 1273 | } |