]>
Commit | Line | Data |
---|---|---|
ea46e550 | 1 | /* $OpenBSD: servconf.c,v 1.159 2006/07/21 12:43:36 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; |
ea46e550 | 116 | options->num_permitted_opens = -1; |
e7259e8d | 117 | options->adm_forced_command = NULL; |
8efc0c15 | 118 | } |
119 | ||
6ae2364d | 120 | void |
5260325f | 121 | fill_default_server_options(ServerOptions *options) |
8efc0c15 | 122 | { |
e15895cd | 123 | /* Portable-specific options */ |
7fceb20d | 124 | if (options->use_pam == -1) |
0a23d79f | 125 | options->use_pam = 0; |
e15895cd | 126 | |
127 | /* Standard Options */ | |
fa08c86b | 128 | if (options->protocol == SSH_PROTO_UNKNOWN) |
129 | options->protocol = SSH_PROTO_1|SSH_PROTO_2; | |
130 | if (options->num_host_key_files == 0) { | |
131 | /* fill default hostkeys for protocols */ | |
132 | if (options->protocol & SSH_PROTO_1) | |
0f84fe37 | 133 | options->host_key_files[options->num_host_key_files++] = |
134 | _PATH_HOST_KEY_FILE; | |
135 | if (options->protocol & SSH_PROTO_2) { | |
136 | options->host_key_files[options->num_host_key_files++] = | |
137 | _PATH_HOST_RSA_KEY_FILE; | |
138 | options->host_key_files[options->num_host_key_files++] = | |
139 | _PATH_HOST_DSA_KEY_FILE; | |
140 | } | |
fa08c86b | 141 | } |
48e671d5 | 142 | if (options->num_ports == 0) |
143 | options->ports[options->num_ports++] = SSH_DEFAULT_PORT; | |
144 | if (options->listen_addrs == NULL) | |
2d2a2c65 | 145 | add_listen_addr(options, NULL, 0); |
0fbe8c74 | 146 | if (options->pid_file == NULL) |
42f11eb2 | 147 | options->pid_file = _PATH_SSH_DAEMON_PID_FILE; |
5260325f | 148 | if (options->server_key_bits == -1) |
149 | options->server_key_bits = 768; | |
150 | if (options->login_grace_time == -1) | |
3445ca02 | 151 | options->login_grace_time = 120; |
5260325f | 152 | if (options->key_regeneration_time == -1) |
153 | options->key_regeneration_time = 3600; | |
15853e93 | 154 | if (options->permit_root_login == PERMIT_NOT_SET) |
155 | options->permit_root_login = PERMIT_YES; | |
5260325f | 156 | if (options->ignore_rhosts == -1) |
c8d54615 | 157 | options->ignore_rhosts = 1; |
5260325f | 158 | if (options->ignore_user_known_hosts == -1) |
159 | options->ignore_user_known_hosts = 0; | |
5260325f | 160 | if (options->print_motd == -1) |
161 | options->print_motd = 1; | |
4f4648f9 | 162 | if (options->print_lastlog == -1) |
163 | options->print_lastlog = 1; | |
5260325f | 164 | if (options->x11_forwarding == -1) |
c8d54615 | 165 | options->x11_forwarding = 0; |
5260325f | 166 | if (options->x11_display_offset == -1) |
c8d54615 | 167 | options->x11_display_offset = 10; |
e6e573bd | 168 | if (options->x11_use_localhost == -1) |
169 | options->x11_use_localhost = 1; | |
fa649821 | 170 | if (options->xauth_location == NULL) |
fd9ede94 | 171 | options->xauth_location = _PATH_XAUTH; |
5260325f | 172 | if (options->strict_modes == -1) |
173 | options->strict_modes = 1; | |
fd573618 | 174 | if (options->tcp_keep_alive == -1) |
175 | options->tcp_keep_alive = 1; | |
5eaf8578 | 176 | if (options->log_facility == SYSLOG_FACILITY_NOT_SET) |
5260325f | 177 | options->log_facility = SYSLOG_FACILITY_AUTH; |
5eaf8578 | 178 | if (options->log_level == SYSLOG_LEVEL_NOT_SET) |
59c97189 | 179 | options->log_level = SYSLOG_LEVEL_INFO; |
5260325f | 180 | if (options->rhosts_rsa_authentication == -1) |
c8d54615 | 181 | options->rhosts_rsa_authentication = 0; |
8002af61 | 182 | if (options->hostbased_authentication == -1) |
183 | options->hostbased_authentication = 0; | |
184 | if (options->hostbased_uses_name_from_packet_only == -1) | |
185 | options->hostbased_uses_name_from_packet_only = 0; | |
5260325f | 186 | if (options->rsa_authentication == -1) |
187 | options->rsa_authentication = 1; | |
fa08c86b | 188 | if (options->pubkey_authentication == -1) |
189 | options->pubkey_authentication = 1; | |
5260325f | 190 | if (options->kerberos_authentication == -1) |
eadc806d | 191 | options->kerberos_authentication = 0; |
5260325f | 192 | if (options->kerberos_or_local_passwd == -1) |
193 | options->kerberos_or_local_passwd = 1; | |
194 | if (options->kerberos_ticket_cleanup == -1) | |
195 | options->kerberos_ticket_cleanup = 1; | |
a1e30b47 | 196 | if (options->kerberos_get_afs_token == -1) |
197 | options->kerberos_get_afs_token = 0; | |
7364bd04 | 198 | if (options->gss_authentication == -1) |
199 | options->gss_authentication = 0; | |
200 | if (options->gss_cleanup_creds == -1) | |
201 | options->gss_cleanup_creds = 1; | |
5260325f | 202 | if (options->password_authentication == -1) |
203 | options->password_authentication = 1; | |
94ec8c6b | 204 | if (options->kbd_interactive_authentication == -1) |
205 | options->kbd_interactive_authentication = 0; | |
5ba55ada | 206 | if (options->challenge_response_authentication == -1) |
207 | options->challenge_response_authentication = 1; | |
5260325f | 208 | if (options->permit_empty_passwd == -1) |
c8d54615 | 209 | options->permit_empty_passwd = 0; |
f00bab84 | 210 | if (options->permit_user_env == -1) |
211 | options->permit_user_env = 0; | |
5260325f | 212 | if (options->use_login == -1) |
213 | options->use_login = 0; | |
636f76ca | 214 | if (options->compression == -1) |
07200973 | 215 | options->compression = COMP_DELAYED; |
33de75a3 | 216 | if (options->allow_tcp_forwarding == -1) |
217 | options->allow_tcp_forwarding = 1; | |
1d1ffb87 | 218 | if (options->gateway_ports == -1) |
219 | options->gateway_ports = 0; | |
089fbbd2 | 220 | if (options->max_startups == -1) |
221 | options->max_startups = 10; | |
c345cf9d | 222 | if (options->max_startups_rate == -1) |
223 | options->max_startups_rate = 100; /* 100% */ | |
224 | if (options->max_startups_begin == -1) | |
225 | options->max_startups_begin = options->max_startups; | |
af4bd935 | 226 | if (options->max_authtries == -1) |
227 | options->max_authtries = DEFAULT_AUTH_FAIL_MAX; | |
c5a7d788 | 228 | if (options->use_dns == -1) |
229 | options->use_dns = 1; | |
3ffc6336 | 230 | if (options->client_alive_interval == -1) |
184eed6a | 231 | options->client_alive_interval = 0; |
3ffc6336 | 232 | if (options->client_alive_count_max == -1) |
233 | options->client_alive_count_max = 3; | |
5df83e07 | 234 | if (options->authorized_keys_file2 == NULL) { |
235 | /* authorized_keys_file2 falls back to authorized_keys_file */ | |
236 | if (options->authorized_keys_file != NULL) | |
237 | options->authorized_keys_file2 = options->authorized_keys_file; | |
238 | else | |
239 | options->authorized_keys_file2 = _PATH_SSH_USER_PERMITTED_KEYS2; | |
240 | } | |
241 | if (options->authorized_keys_file == NULL) | |
242 | options->authorized_keys_file = _PATH_SSH_USER_PERMITTED_KEYS; | |
d20f3c9e | 243 | if (options->permit_tun == -1) |
a4f24bf8 | 244 | options->permit_tun = SSH_TUNMODE_NO; |
1853d1ef | 245 | |
2ee1b704 | 246 | /* Turn privilege separation on by default */ |
1853d1ef | 247 | if (use_privsep == -1) |
2ee1b704 | 248 | use_privsep = 1; |
e299a298 | 249 | |
4165b82e | 250 | #ifndef HAVE_MMAP |
e299a298 | 251 | if (use_privsep && options->compression == 1) { |
252 | error("This platform does not support both privilege " | |
253 | "separation and compression"); | |
254 | error("Compression disabled"); | |
255 | options->compression = 0; | |
256 | } | |
257 | #endif | |
258 | ||
8efc0c15 | 259 | } |
260 | ||
8efc0c15 | 261 | /* Keyword tokens. */ |
5260325f | 262 | typedef enum { |
263 | sBadOption, /* == unknown option */ | |
e15895cd | 264 | /* Portable-specific options */ |
7fceb20d | 265 | sUsePAM, |
e15895cd | 266 | /* Standard Options */ |
5260325f | 267 | sPort, sHostKeyFile, sServerKeyBits, sLoginGraceTime, sKeyRegenerationTime, |
268 | sPermitRootLogin, sLogFacility, sLogLevel, | |
0598d99d | 269 | sRhostsRSAAuthentication, sRSAAuthentication, |
5260325f | 270 | sKerberosAuthentication, sKerberosOrLocalPasswd, sKerberosTicketCleanup, |
a1e30b47 | 271 | sKerberosGetAFSToken, |
1c590258 | 272 | sKerberosTgtPassing, sChallengeResponseAuthentication, |
31b41ceb | 273 | sPasswordAuthentication, sKbdInteractiveAuthentication, |
274 | sListenAddress, sAddressFamily, | |
4f4648f9 | 275 | sPrintMotd, sPrintLastLog, sIgnoreRhosts, |
e6e573bd | 276 | sX11Forwarding, sX11DisplayOffset, sX11UseLocalhost, |
fd573618 | 277 | sStrictModes, sEmptyPasswd, sTCPKeepAlive, |
f00bab84 | 278 | sPermitUserEnvironment, sUseLogin, sAllowTcpForwarding, sCompression, |
33de75a3 | 279 | sAllowUsers, sDenyUsers, sAllowGroups, sDenyGroups, |
b2552997 | 280 | sIgnoreUserKnownHosts, sCiphers, sMacs, sProtocol, sPidFile, |
af4bd935 | 281 | sGatewayPorts, sPubkeyAuthentication, sXAuthLocation, sSubsystem, |
282 | sMaxStartups, sMaxAuthTries, | |
c5a7d788 | 283 | sBanner, sUseDNS, sHostbasedAuthentication, |
184eed6a | 284 | sHostbasedUsesNameFromPacketOnly, sClientAliveInterval, |
c8445989 | 285 | sClientAliveCountMax, sAuthorizedKeysFile, sAuthorizedKeysFile2, |
d20f3c9e | 286 | sGssAuthentication, sGssCleanupCreds, sAcceptEnv, sPermitTunnel, |
e7259e8d | 287 | sMatch, sPermitOpen, sForceCommand, |
2ea6de2b | 288 | sUsePrivilegeSeparation, |
a2144546 | 289 | sDeprecated, sUnsupported |
8efc0c15 | 290 | } ServerOpCodes; |
291 | ||
d231781a | 292 | #define SSHCFG_GLOBAL 0x01 /* allowed in main section of sshd_config */ |
293 | #define SSHCFG_MATCH 0x02 /* allowed inside a Match section */ | |
294 | #define SSHCFG_ALL (SSHCFG_GLOBAL|SSHCFG_MATCH) | |
295 | ||
8efc0c15 | 296 | /* Textual representation of the tokens. */ |
5260325f | 297 | static struct { |
298 | const char *name; | |
299 | ServerOpCodes opcode; | |
d231781a | 300 | u_int flags; |
5260325f | 301 | } keywords[] = { |
e15895cd | 302 | /* Portable-specific options */ |
b06b11ad | 303 | #ifdef USE_PAM |
d231781a | 304 | { "usepam", sUsePAM, SSHCFG_GLOBAL }, |
b06b11ad | 305 | #else |
d231781a | 306 | { "usepam", sUnsupported, SSHCFG_GLOBAL }, |
b06b11ad | 307 | #endif |
d231781a | 308 | { "pamauthenticationviakbdint", sDeprecated, SSHCFG_GLOBAL }, |
e15895cd | 309 | /* Standard Options */ |
d231781a | 310 | { "port", sPort, SSHCFG_GLOBAL }, |
311 | { "hostkey", sHostKeyFile, SSHCFG_GLOBAL }, | |
312 | { "hostdsakey", sHostKeyFile, SSHCFG_GLOBAL }, /* alias */ | |
313 | { "pidfile", sPidFile, SSHCFG_GLOBAL }, | |
314 | { "serverkeybits", sServerKeyBits, SSHCFG_GLOBAL }, | |
315 | { "logingracetime", sLoginGraceTime, SSHCFG_GLOBAL }, | |
316 | { "keyregenerationinterval", sKeyRegenerationTime, SSHCFG_GLOBAL }, | |
317 | { "permitrootlogin", sPermitRootLogin, SSHCFG_GLOBAL }, | |
318 | { "syslogfacility", sLogFacility, SSHCFG_GLOBAL }, | |
319 | { "loglevel", sLogLevel, SSHCFG_GLOBAL }, | |
320 | { "rhostsauthentication", sDeprecated, SSHCFG_GLOBAL }, | |
321 | { "rhostsrsaauthentication", sRhostsRSAAuthentication, SSHCFG_GLOBAL }, | |
322 | { "hostbasedauthentication", sHostbasedAuthentication, SSHCFG_GLOBAL }, | |
323 | { "hostbasedusesnamefrompacketonly", sHostbasedUsesNameFromPacketOnly, SSHCFG_GLOBAL }, | |
324 | { "rsaauthentication", sRSAAuthentication, SSHCFG_GLOBAL }, | |
325 | { "pubkeyauthentication", sPubkeyAuthentication, SSHCFG_GLOBAL }, | |
326 | { "dsaauthentication", sPubkeyAuthentication, SSHCFG_GLOBAL }, /* alias */ | |
1c590258 | 327 | #ifdef KRB5 |
d231781a | 328 | { "kerberosauthentication", sKerberosAuthentication, SSHCFG_GLOBAL }, |
329 | { "kerberosorlocalpasswd", sKerberosOrLocalPasswd, SSHCFG_GLOBAL }, | |
330 | { "kerberosticketcleanup", sKerberosTicketCleanup, SSHCFG_GLOBAL }, | |
bcfcc5f9 | 331 | #ifdef USE_AFS |
d231781a | 332 | { "kerberosgetafstoken", sKerberosGetAFSToken, SSHCFG_GLOBAL }, |
309af4e5 | 333 | #else |
d231781a | 334 | { "kerberosgetafstoken", sUnsupported, SSHCFG_GLOBAL }, |
309af4e5 | 335 | #endif |
a2144546 | 336 | #else |
d231781a | 337 | { "kerberosauthentication", sUnsupported, SSHCFG_GLOBAL }, |
338 | { "kerberosorlocalpasswd", sUnsupported, SSHCFG_GLOBAL }, | |
339 | { "kerberosticketcleanup", sUnsupported, SSHCFG_GLOBAL }, | |
340 | { "kerberosgetafstoken", sUnsupported, SSHCFG_GLOBAL }, | |
a2144546 | 341 | #endif |
d231781a | 342 | { "kerberostgtpassing", sUnsupported, SSHCFG_GLOBAL }, |
343 | { "afstokenpassing", sUnsupported, SSHCFG_GLOBAL }, | |
7364bd04 | 344 | #ifdef GSSAPI |
d231781a | 345 | { "gssapiauthentication", sGssAuthentication, SSHCFG_GLOBAL }, |
346 | { "gssapicleanupcredentials", sGssCleanupCreds, SSHCFG_GLOBAL }, | |
7364bd04 | 347 | #else |
d231781a | 348 | { "gssapiauthentication", sUnsupported, SSHCFG_GLOBAL }, |
349 | { "gssapicleanupcredentials", sUnsupported, SSHCFG_GLOBAL }, | |
7364bd04 | 350 | #endif |
d231781a | 351 | { "passwordauthentication", sPasswordAuthentication, SSHCFG_GLOBAL }, |
352 | { "kbdinteractiveauthentication", sKbdInteractiveAuthentication, SSHCFG_GLOBAL }, | |
353 | { "challengeresponseauthentication", sChallengeResponseAuthentication, SSHCFG_GLOBAL }, | |
354 | { "skeyauthentication", sChallengeResponseAuthentication, SSHCFG_GLOBAL }, /* alias */ | |
355 | { "checkmail", sDeprecated, SSHCFG_GLOBAL }, | |
356 | { "listenaddress", sListenAddress, SSHCFG_GLOBAL }, | |
357 | { "addressfamily", sAddressFamily, SSHCFG_GLOBAL }, | |
358 | { "printmotd", sPrintMotd, SSHCFG_GLOBAL }, | |
359 | { "printlastlog", sPrintLastLog, SSHCFG_GLOBAL }, | |
360 | { "ignorerhosts", sIgnoreRhosts, SSHCFG_GLOBAL }, | |
361 | { "ignoreuserknownhosts", sIgnoreUserKnownHosts, SSHCFG_GLOBAL }, | |
691712e0 | 362 | { "x11forwarding", sX11Forwarding, SSHCFG_ALL }, |
363 | { "x11displayoffset", sX11DisplayOffset, SSHCFG_ALL }, | |
364 | { "x11uselocalhost", sX11UseLocalhost, SSHCFG_ALL }, | |
d231781a | 365 | { "xauthlocation", sXAuthLocation, SSHCFG_GLOBAL }, |
366 | { "strictmodes", sStrictModes, SSHCFG_GLOBAL }, | |
367 | { "permitemptypasswords", sEmptyPasswd, SSHCFG_GLOBAL }, | |
368 | { "permituserenvironment", sPermitUserEnvironment, SSHCFG_GLOBAL }, | |
369 | { "uselogin", sUseLogin, SSHCFG_GLOBAL }, | |
370 | { "compression", sCompression, SSHCFG_GLOBAL }, | |
371 | { "tcpkeepalive", sTCPKeepAlive, SSHCFG_GLOBAL }, | |
372 | { "keepalive", sTCPKeepAlive, SSHCFG_GLOBAL }, /* obsolete alias */ | |
373 | { "allowtcpforwarding", sAllowTcpForwarding, SSHCFG_ALL }, | |
374 | { "allowusers", sAllowUsers, SSHCFG_GLOBAL }, | |
375 | { "denyusers", sDenyUsers, SSHCFG_GLOBAL }, | |
376 | { "allowgroups", sAllowGroups, SSHCFG_GLOBAL }, | |
377 | { "denygroups", sDenyGroups, SSHCFG_GLOBAL }, | |
378 | { "ciphers", sCiphers, SSHCFG_GLOBAL }, | |
379 | { "macs", sMacs, SSHCFG_GLOBAL }, | |
380 | { "protocol", sProtocol, SSHCFG_GLOBAL }, | |
381 | { "gatewayports", sGatewayPorts, SSHCFG_ALL }, | |
382 | { "subsystem", sSubsystem, SSHCFG_GLOBAL }, | |
383 | { "maxstartups", sMaxStartups, SSHCFG_GLOBAL }, | |
384 | { "maxauthtries", sMaxAuthTries, SSHCFG_GLOBAL }, | |
385 | { "banner", sBanner, SSHCFG_GLOBAL }, | |
386 | { "usedns", sUseDNS, SSHCFG_GLOBAL }, | |
387 | { "verifyreversemapping", sDeprecated, SSHCFG_GLOBAL }, | |
388 | { "reversemappingcheck", sDeprecated, SSHCFG_GLOBAL }, | |
389 | { "clientaliveinterval", sClientAliveInterval, SSHCFG_GLOBAL }, | |
390 | { "clientalivecountmax", sClientAliveCountMax, SSHCFG_GLOBAL }, | |
391 | { "authorizedkeysfile", sAuthorizedKeysFile, SSHCFG_GLOBAL }, | |
392 | { "authorizedkeysfile2", sAuthorizedKeysFile2, SSHCFG_GLOBAL }, | |
393 | { "useprivilegeseparation", sUsePrivilegeSeparation, SSHCFG_GLOBAL }, | |
394 | { "acceptenv", sAcceptEnv, SSHCFG_GLOBAL }, | |
395 | { "permittunnel", sPermitTunnel, SSHCFG_GLOBAL }, | |
2fefbadf | 396 | { "match", sMatch, SSHCFG_ALL }, |
397 | { "permitopen", sPermitOpen, SSHCFG_ALL }, | |
e7259e8d | 398 | { "forcecommand", sForceCommand, SSHCFG_ALL }, |
d231781a | 399 | { NULL, sBadOption, 0 } |
8efc0c15 | 400 | }; |
401 | ||
aa3378df | 402 | /* |
6be9a5e8 | 403 | * Returns the number of the token pointed to by cp or sBadOption. |
aa3378df | 404 | */ |
8efc0c15 | 405 | |
6ae2364d | 406 | static ServerOpCodes |
5260325f | 407 | parse_token(const char *cp, const char *filename, |
d231781a | 408 | int linenum, u_int *flags) |
8efc0c15 | 409 | { |
1e3b8b07 | 410 | u_int i; |
8efc0c15 | 411 | |
5260325f | 412 | for (i = 0; keywords[i].name; i++) |
d231781a | 413 | if (strcasecmp(cp, keywords[i].name) == 0) { |
414 | *flags = keywords[i].flags; | |
5260325f | 415 | return keywords[i].opcode; |
d231781a | 416 | } |
8efc0c15 | 417 | |
b7c70970 | 418 | error("%s: line %d: Bad configuration option: %s", |
419 | filename, linenum, cp); | |
5260325f | 420 | return sBadOption; |
8efc0c15 | 421 | } |
422 | ||
396c147e | 423 | static void |
2d2a2c65 | 424 | add_listen_addr(ServerOptions *options, char *addr, u_short port) |
48e671d5 | 425 | { |
2ceb8101 | 426 | u_int i; |
48e671d5 | 427 | |
428 | if (options->num_ports == 0) | |
429 | options->ports[options->num_ports++] = SSH_DEFAULT_PORT; | |
31b41ceb | 430 | if (options->address_family == -1) |
431 | options->address_family = AF_UNSPEC; | |
2d2a2c65 | 432 | if (port == 0) |
d11c1288 | 433 | for (i = 0; i < options->num_ports; i++) |
434 | add_one_listen_addr(options, addr, options->ports[i]); | |
435 | else | |
2d2a2c65 | 436 | add_one_listen_addr(options, addr, port); |
d11c1288 | 437 | } |
438 | ||
396c147e | 439 | static void |
d11c1288 | 440 | add_one_listen_addr(ServerOptions *options, char *addr, u_short port) |
441 | { | |
442 | struct addrinfo hints, *ai, *aitop; | |
443 | char strport[NI_MAXSERV]; | |
444 | int gaierr; | |
445 | ||
446 | memset(&hints, 0, sizeof(hints)); | |
31b41ceb | 447 | hints.ai_family = options->address_family; |
d11c1288 | 448 | hints.ai_socktype = SOCK_STREAM; |
449 | hints.ai_flags = (addr == NULL) ? AI_PASSIVE : 0; | |
7528d467 | 450 | snprintf(strport, sizeof strport, "%u", port); |
d11c1288 | 451 | if ((gaierr = getaddrinfo(addr, strport, &hints, &aitop)) != 0) |
452 | fatal("bad addr or host: %s (%s)", | |
453 | addr ? addr : "<NULL>", | |
454 | gai_strerror(gaierr)); | |
455 | for (ai = aitop; ai->ai_next; ai = ai->ai_next) | |
456 | ; | |
457 | ai->ai_next = options->listen_addrs; | |
458 | options->listen_addrs = aitop; | |
48e671d5 | 459 | } |
460 | ||
d231781a | 461 | /* |
462 | * The strategy for the Match blocks is that the config file is parsed twice. | |
463 | * | |
464 | * The first time is at startup. activep is initialized to 1 and the | |
465 | * directives in the global context are processed and acted on. Hitting a | |
466 | * Match directive unsets activep and the directives inside the block are | |
467 | * checked for syntax only. | |
468 | * | |
469 | * The second time is after a connection has been established but before | |
470 | * authentication. activep is initialized to 2 and global config directives | |
471 | * are ignored since they have already been processed. If the criteria in a | |
472 | * Match block is met, activep is set and the subsequent directives | |
473 | * processed and actioned until EOF or another Match block unsets it. Any | |
474 | * options set are copied into the main server config. | |
475 | * | |
476 | * Potential additions/improvements: | |
477 | * - Add Match support for pre-kex directives, eg Protocol, Ciphers. | |
478 | * | |
479 | * - Add a Tag directive (idea from David Leonard) ala pf, eg: | |
480 | * Match Address 192.168.0.* | |
481 | * Tag trusted | |
482 | * Match Group wheel | |
483 | * Tag trusted | |
484 | * Match Tag trusted | |
485 | * AllowTcpForwarding yes | |
486 | * GatewayPorts clientspecified | |
487 | * [...] | |
488 | * | |
489 | * - Add a PermittedChannelRequests directive | |
490 | * Match Group shell | |
491 | * PermittedChannelRequests session,forwarded-tcpip | |
492 | */ | |
493 | ||
494 | static int | |
495 | match_cfg_line(char **condition, int line, const char *user, const char *host, | |
496 | const char *address) | |
497 | { | |
498 | int result = 1; | |
499 | char *arg, *attrib, *cp = *condition; | |
500 | size_t len; | |
501 | ||
502 | if (user == NULL) | |
503 | debug3("checking syntax for 'Match %s'", cp); | |
504 | else | |
505 | debug3("checking match for '%s' user %s host %s addr %s", cp, | |
506 | user ? user : "(null)", host ? host : "(null)", | |
507 | address ? address : "(null)"); | |
508 | ||
509 | while ((attrib = strdelim(&cp)) && *attrib != '\0') { | |
510 | if ((arg = strdelim(&cp)) == NULL || *arg == '\0') { | |
511 | error("Missing Match criteria for %s", attrib); | |
512 | return -1; | |
513 | } | |
514 | len = strlen(arg); | |
515 | if (strcasecmp(attrib, "user") == 0) { | |
516 | if (!user) { | |
517 | result = 0; | |
518 | continue; | |
519 | } | |
520 | if (match_pattern_list(user, arg, len, 0) != 1) | |
521 | result = 0; | |
522 | else | |
523 | debug("user %.100s matched 'User %.100s' at " | |
524 | "line %d", user, arg, line); | |
525 | } else if (strcasecmp(attrib, "host") == 0) { | |
526 | if (!host) { | |
527 | result = 0; | |
528 | continue; | |
529 | } | |
530 | if (match_hostname(host, arg, len) != 1) | |
531 | result = 0; | |
532 | else | |
533 | debug("connection from %.100s matched 'Host " | |
534 | "%.100s' at line %d", host, arg, line); | |
535 | } else if (strcasecmp(attrib, "address") == 0) { | |
536 | debug("address '%s' arg '%s'", address, arg); | |
537 | if (!address) { | |
538 | result = 0; | |
539 | continue; | |
540 | } | |
541 | if (match_hostname(address, arg, len) != 1) | |
542 | result = 0; | |
543 | else | |
544 | debug("connection from %.100s matched 'Address " | |
545 | "%.100s' at line %d", address, arg, line); | |
546 | } else { | |
547 | error("Unsupported Match attribute %s", attrib); | |
548 | return -1; | |
549 | } | |
550 | } | |
551 | if (user != NULL) | |
552 | debug3("match %sfound", result ? "" : "not "); | |
553 | *condition = cp; | |
554 | return result; | |
555 | } | |
556 | ||
e7259e8d | 557 | #define WHITESPACE " \t\r\n" |
558 | ||
2717fa0f | 559 | int |
560 | process_server_config_line(ServerOptions *options, char *line, | |
d231781a | 561 | const char *filename, int linenum, int *activep, const char *user, |
562 | const char *host, const char *address) | |
8efc0c15 | 563 | { |
d11c1288 | 564 | char *cp, **charptr, *arg, *p; |
d231781a | 565 | int cmdline = 0, *intptr, value, n; |
5260325f | 566 | ServerOpCodes opcode; |
3867aa0a | 567 | u_short port; |
d231781a | 568 | u_int i, flags = 0; |
d66ce1a1 | 569 | size_t len; |
5260325f | 570 | |
2717fa0f | 571 | cp = line; |
0f8cd5a6 | 572 | if ((arg = strdelim(&cp)) == NULL) |
88299971 | 573 | return 0; |
2717fa0f | 574 | /* Ignore leading whitespace */ |
575 | if (*arg == '\0') | |
704b1659 | 576 | arg = strdelim(&cp); |
2717fa0f | 577 | if (!arg || !*arg || *arg == '#') |
578 | return 0; | |
579 | intptr = NULL; | |
580 | charptr = NULL; | |
d231781a | 581 | opcode = parse_token(arg, filename, linenum, &flags); |
582 | ||
583 | if (activep == NULL) { /* We are processing a command line directive */ | |
584 | cmdline = 1; | |
585 | activep = &cmdline; | |
586 | } | |
587 | if (*activep && opcode != sMatch) | |
588 | debug3("%s:%d setting %s %s", filename, linenum, arg, cp); | |
589 | if (*activep == 0 && !(flags & SSHCFG_MATCH)) { | |
590 | if (user == NULL) { | |
591 | fatal("%s line %d: Directive '%s' is not allowed " | |
592 | "within a Match block", filename, linenum, arg); | |
593 | } else { /* this is a directive we have already processed */ | |
594 | while (arg) | |
595 | arg = strdelim(&cp); | |
596 | return 0; | |
597 | } | |
598 | } | |
599 | ||
2717fa0f | 600 | switch (opcode) { |
601 | /* Portable-specific options */ | |
7fceb20d | 602 | case sUsePAM: |
603 | intptr = &options->use_pam; | |
2717fa0f | 604 | goto parse_flag; |
48e671d5 | 605 | |
2717fa0f | 606 | /* Standard Options */ |
607 | case sBadOption: | |
608 | return -1; | |
609 | case sPort: | |
610 | /* ignore ports from configfile if cmdline specifies ports */ | |
611 | if (options->ports_from_cmdline) | |
612 | return 0; | |
613 | if (options->listen_addrs != NULL) | |
614 | fatal("%s line %d: ports must be specified before " | |
3a454b6a | 615 | "ListenAddress.", filename, linenum); |
2717fa0f | 616 | if (options->num_ports >= MAX_PORTS) |
617 | fatal("%s line %d: too many ports.", | |
618 | filename, linenum); | |
619 | arg = strdelim(&cp); | |
620 | if (!arg || *arg == '\0') | |
621 | fatal("%s line %d: missing port number.", | |
622 | filename, linenum); | |
623 | options->ports[options->num_ports++] = a2port(arg); | |
624 | if (options->ports[options->num_ports-1] == 0) | |
625 | fatal("%s line %d: Badly formatted port number.", | |
626 | filename, linenum); | |
627 | break; | |
628 | ||
629 | case sServerKeyBits: | |
630 | intptr = &options->server_key_bits; | |
5260325f | 631 | parse_int: |
2717fa0f | 632 | arg = strdelim(&cp); |
633 | if (!arg || *arg == '\0') | |
634 | fatal("%s line %d: missing integer value.", | |
635 | filename, linenum); | |
636 | value = atoi(arg); | |
d231781a | 637 | if (*activep && *intptr == -1) |
2717fa0f | 638 | *intptr = value; |
639 | break; | |
640 | ||
641 | case sLoginGraceTime: | |
642 | intptr = &options->login_grace_time; | |
e2b1fb42 | 643 | parse_time: |
2717fa0f | 644 | arg = strdelim(&cp); |
645 | if (!arg || *arg == '\0') | |
646 | fatal("%s line %d: missing time value.", | |
647 | filename, linenum); | |
648 | if ((value = convtime(arg)) == -1) | |
649 | fatal("%s line %d: invalid time value.", | |
650 | filename, linenum); | |
651 | if (*intptr == -1) | |
652 | *intptr = value; | |
653 | break; | |
654 | ||
655 | case sKeyRegenerationTime: | |
656 | intptr = &options->key_regeneration_time; | |
657 | goto parse_time; | |
658 | ||
659 | case sListenAddress: | |
660 | arg = strdelim(&cp); | |
3867aa0a | 661 | if (arg == NULL || *arg == '\0') |
662 | fatal("%s line %d: missing address", | |
2717fa0f | 663 | filename, linenum); |
91135a0e | 664 | /* check for bare IPv6 address: no "[]" and 2 or more ":" */ |
665 | if (strchr(arg, '[') == NULL && (p = strchr(arg, ':')) != NULL | |
666 | && strchr(p+1, ':') != NULL) { | |
667 | add_listen_addr(options, arg, 0); | |
668 | break; | |
669 | } | |
3867aa0a | 670 | p = hpdelim(&arg); |
671 | if (p == NULL) | |
672 | fatal("%s line %d: bad address:port usage", | |
2717fa0f | 673 | filename, linenum); |
3867aa0a | 674 | p = cleanhostname(p); |
675 | if (arg == NULL) | |
676 | port = 0; | |
677 | else if ((port = a2port(arg)) == 0) | |
678 | fatal("%s line %d: bad port number", filename, linenum); | |
679 | ||
680 | add_listen_addr(options, p, port); | |
681 | ||
2717fa0f | 682 | break; |
683 | ||
31b41ceb | 684 | case sAddressFamily: |
685 | arg = strdelim(&cp); | |
38634ff6 | 686 | if (!arg || *arg == '\0') |
687 | fatal("%s line %d: missing address family.", | |
688 | filename, linenum); | |
31b41ceb | 689 | intptr = &options->address_family; |
690 | if (options->listen_addrs != NULL) | |
691 | fatal("%s line %d: address family must be specified before " | |
692 | "ListenAddress.", filename, linenum); | |
693 | if (strcasecmp(arg, "inet") == 0) | |
694 | value = AF_INET; | |
695 | else if (strcasecmp(arg, "inet6") == 0) | |
696 | value = AF_INET6; | |
697 | else if (strcasecmp(arg, "any") == 0) | |
698 | value = AF_UNSPEC; | |
699 | else | |
700 | fatal("%s line %d: unsupported address family \"%s\".", | |
701 | filename, linenum, arg); | |
702 | if (*intptr == -1) | |
703 | *intptr = value; | |
704 | break; | |
705 | ||
2717fa0f | 706 | case sHostKeyFile: |
707 | intptr = &options->num_host_key_files; | |
708 | if (*intptr >= MAX_HOSTKEYS) | |
709 | fatal("%s line %d: too many host keys specified (max %d).", | |
710 | filename, linenum, MAX_HOSTKEYS); | |
711 | charptr = &options->host_key_files[*intptr]; | |
fa649821 | 712 | parse_filename: |
2717fa0f | 713 | arg = strdelim(&cp); |
714 | if (!arg || *arg == '\0') | |
715 | fatal("%s line %d: missing file name.", | |
716 | filename, linenum); | |
d231781a | 717 | if (*activep && *charptr == NULL) { |
2717fa0f | 718 | *charptr = tilde_expand_filename(arg, getuid()); |
719 | /* increase optional counter */ | |
720 | if (intptr != NULL) | |
721 | *intptr = *intptr + 1; | |
722 | } | |
723 | break; | |
0fbe8c74 | 724 | |
2717fa0f | 725 | case sPidFile: |
726 | charptr = &options->pid_file; | |
727 | goto parse_filename; | |
5260325f | 728 | |
2717fa0f | 729 | case sPermitRootLogin: |
730 | intptr = &options->permit_root_login; | |
731 | arg = strdelim(&cp); | |
732 | if (!arg || *arg == '\0') | |
733 | fatal("%s line %d: missing yes/" | |
734 | "without-password/forced-commands-only/no " | |
735 | "argument.", filename, linenum); | |
736 | value = 0; /* silence compiler */ | |
737 | if (strcmp(arg, "without-password") == 0) | |
738 | value = PERMIT_NO_PASSWD; | |
739 | else if (strcmp(arg, "forced-commands-only") == 0) | |
740 | value = PERMIT_FORCED_ONLY; | |
741 | else if (strcmp(arg, "yes") == 0) | |
742 | value = PERMIT_YES; | |
743 | else if (strcmp(arg, "no") == 0) | |
744 | value = PERMIT_NO; | |
745 | else | |
746 | fatal("%s line %d: Bad yes/" | |
747 | "without-password/forced-commands-only/no " | |
748 | "argument: %s", filename, linenum, arg); | |
749 | if (*intptr == -1) | |
750 | *intptr = value; | |
751 | break; | |
752 | ||
753 | case sIgnoreRhosts: | |
754 | intptr = &options->ignore_rhosts; | |
5260325f | 755 | parse_flag: |
2717fa0f | 756 | arg = strdelim(&cp); |
757 | if (!arg || *arg == '\0') | |
758 | fatal("%s line %d: missing yes/no argument.", | |
759 | filename, linenum); | |
760 | value = 0; /* silence compiler */ | |
761 | if (strcmp(arg, "yes") == 0) | |
762 | value = 1; | |
763 | else if (strcmp(arg, "no") == 0) | |
764 | value = 0; | |
765 | else | |
766 | fatal("%s line %d: Bad yes/no argument: %s", | |
767 | filename, linenum, arg); | |
d231781a | 768 | if (*activep && *intptr == -1) |
2717fa0f | 769 | *intptr = value; |
770 | break; | |
771 | ||
772 | case sIgnoreUserKnownHosts: | |
773 | intptr = &options->ignore_user_known_hosts; | |
774 | goto parse_flag; | |
775 | ||
2717fa0f | 776 | case sRhostsRSAAuthentication: |
777 | intptr = &options->rhosts_rsa_authentication; | |
778 | goto parse_flag; | |
779 | ||
780 | case sHostbasedAuthentication: | |
781 | intptr = &options->hostbased_authentication; | |
782 | goto parse_flag; | |
783 | ||
784 | case sHostbasedUsesNameFromPacketOnly: | |
785 | intptr = &options->hostbased_uses_name_from_packet_only; | |
786 | goto parse_flag; | |
787 | ||
788 | case sRSAAuthentication: | |
789 | intptr = &options->rsa_authentication; | |
790 | goto parse_flag; | |
791 | ||
792 | case sPubkeyAuthentication: | |
793 | intptr = &options->pubkey_authentication; | |
794 | goto parse_flag; | |
d0ec7f42 | 795 | |
2717fa0f | 796 | case sKerberosAuthentication: |
797 | intptr = &options->kerberos_authentication; | |
798 | goto parse_flag; | |
5260325f | 799 | |
2717fa0f | 800 | case sKerberosOrLocalPasswd: |
801 | intptr = &options->kerberos_or_local_passwd; | |
802 | goto parse_flag; | |
5260325f | 803 | |
2717fa0f | 804 | case sKerberosTicketCleanup: |
805 | intptr = &options->kerberos_ticket_cleanup; | |
806 | goto parse_flag; | |
d0ec7f42 | 807 | |
a1e30b47 | 808 | case sKerberosGetAFSToken: |
809 | intptr = &options->kerberos_get_afs_token; | |
810 | goto parse_flag; | |
811 | ||
7364bd04 | 812 | case sGssAuthentication: |
813 | intptr = &options->gss_authentication; | |
814 | goto parse_flag; | |
815 | ||
816 | case sGssCleanupCreds: | |
817 | intptr = &options->gss_cleanup_creds; | |
818 | goto parse_flag; | |
819 | ||
2717fa0f | 820 | case sPasswordAuthentication: |
821 | intptr = &options->password_authentication; | |
822 | goto parse_flag; | |
5260325f | 823 | |
2717fa0f | 824 | case sKbdInteractiveAuthentication: |
825 | intptr = &options->kbd_interactive_authentication; | |
826 | goto parse_flag; | |
8002af61 | 827 | |
2717fa0f | 828 | case sChallengeResponseAuthentication: |
829 | intptr = &options->challenge_response_authentication; | |
830 | goto parse_flag; | |
8002af61 | 831 | |
2717fa0f | 832 | case sPrintMotd: |
833 | intptr = &options->print_motd; | |
834 | goto parse_flag; | |
5260325f | 835 | |
2717fa0f | 836 | case sPrintLastLog: |
837 | intptr = &options->print_lastlog; | |
838 | goto parse_flag; | |
5260325f | 839 | |
2717fa0f | 840 | case sX11Forwarding: |
841 | intptr = &options->x11_forwarding; | |
842 | goto parse_flag; | |
5260325f | 843 | |
2717fa0f | 844 | case sX11DisplayOffset: |
845 | intptr = &options->x11_display_offset; | |
846 | goto parse_int; | |
8efc0c15 | 847 | |
e6e573bd | 848 | case sX11UseLocalhost: |
849 | intptr = &options->x11_use_localhost; | |
850 | goto parse_flag; | |
851 | ||
2717fa0f | 852 | case sXAuthLocation: |
853 | charptr = &options->xauth_location; | |
854 | goto parse_filename; | |
5260325f | 855 | |
2717fa0f | 856 | case sStrictModes: |
857 | intptr = &options->strict_modes; | |
858 | goto parse_flag; | |
5260325f | 859 | |
fd573618 | 860 | case sTCPKeepAlive: |
861 | intptr = &options->tcp_keep_alive; | |
2717fa0f | 862 | goto parse_flag; |
33de75a3 | 863 | |
2717fa0f | 864 | case sEmptyPasswd: |
865 | intptr = &options->permit_empty_passwd; | |
866 | goto parse_flag; | |
5260325f | 867 | |
f00bab84 | 868 | case sPermitUserEnvironment: |
869 | intptr = &options->permit_user_env; | |
870 | goto parse_flag; | |
871 | ||
2717fa0f | 872 | case sUseLogin: |
873 | intptr = &options->use_login; | |
874 | goto parse_flag; | |
5260325f | 875 | |
636f76ca | 876 | case sCompression: |
877 | intptr = &options->compression; | |
07200973 | 878 | arg = strdelim(&cp); |
879 | if (!arg || *arg == '\0') | |
880 | fatal("%s line %d: missing yes/no/delayed " | |
881 | "argument.", filename, linenum); | |
882 | value = 0; /* silence compiler */ | |
883 | if (strcmp(arg, "delayed") == 0) | |
884 | value = COMP_DELAYED; | |
885 | else if (strcmp(arg, "yes") == 0) | |
886 | value = COMP_ZLIB; | |
887 | else if (strcmp(arg, "no") == 0) | |
888 | value = COMP_NONE; | |
889 | else | |
890 | fatal("%s line %d: Bad yes/no/delayed " | |
891 | "argument: %s", filename, linenum, arg); | |
892 | if (*intptr == -1) | |
893 | *intptr = value; | |
894 | break; | |
636f76ca | 895 | |
2717fa0f | 896 | case sGatewayPorts: |
897 | intptr = &options->gateway_ports; | |
3867aa0a | 898 | arg = strdelim(&cp); |
899 | if (!arg || *arg == '\0') | |
900 | fatal("%s line %d: missing yes/no/clientspecified " | |
901 | "argument.", filename, linenum); | |
902 | value = 0; /* silence compiler */ | |
903 | if (strcmp(arg, "clientspecified") == 0) | |
904 | value = 2; | |
905 | else if (strcmp(arg, "yes") == 0) | |
906 | value = 1; | |
907 | else if (strcmp(arg, "no") == 0) | |
908 | value = 0; | |
909 | else | |
910 | fatal("%s line %d: Bad yes/no/clientspecified " | |
911 | "argument: %s", filename, linenum, arg); | |
912 | if (*intptr == -1) | |
913 | *intptr = value; | |
914 | break; | |
5260325f | 915 | |
c5a7d788 | 916 | case sUseDNS: |
917 | intptr = &options->use_dns; | |
2717fa0f | 918 | goto parse_flag; |
5260325f | 919 | |
2717fa0f | 920 | case sLogFacility: |
921 | intptr = (int *) &options->log_facility; | |
922 | arg = strdelim(&cp); | |
923 | value = log_facility_number(arg); | |
5eaf8578 | 924 | if (value == SYSLOG_FACILITY_NOT_SET) |
2717fa0f | 925 | fatal("%.200s line %d: unsupported log facility '%s'", |
926 | filename, linenum, arg ? arg : "<NONE>"); | |
927 | if (*intptr == -1) | |
928 | *intptr = (SyslogFacility) value; | |
929 | break; | |
930 | ||
931 | case sLogLevel: | |
932 | intptr = (int *) &options->log_level; | |
933 | arg = strdelim(&cp); | |
934 | value = log_level_number(arg); | |
5eaf8578 | 935 | if (value == SYSLOG_LEVEL_NOT_SET) |
2717fa0f | 936 | fatal("%.200s line %d: unsupported log level '%s'", |
937 | filename, linenum, arg ? arg : "<NONE>"); | |
938 | if (*intptr == -1) | |
939 | *intptr = (LogLevel) value; | |
940 | break; | |
941 | ||
942 | case sAllowTcpForwarding: | |
943 | intptr = &options->allow_tcp_forwarding; | |
944 | goto parse_flag; | |
945 | ||
1853d1ef | 946 | case sUsePrivilegeSeparation: |
947 | intptr = &use_privsep; | |
948 | goto parse_flag; | |
949 | ||
2717fa0f | 950 | case sAllowUsers: |
951 | while ((arg = strdelim(&cp)) && *arg != '\0') { | |
952 | if (options->num_allow_users >= MAX_ALLOW_USERS) | |
953 | fatal("%s line %d: too many allow users.", | |
954 | filename, linenum); | |
7528d467 | 955 | options->allow_users[options->num_allow_users++] = |
956 | xstrdup(arg); | |
2717fa0f | 957 | } |
958 | break; | |
a8be9f80 | 959 | |
2717fa0f | 960 | case sDenyUsers: |
961 | while ((arg = strdelim(&cp)) && *arg != '\0') { | |
962 | if (options->num_deny_users >= MAX_DENY_USERS) | |
963 | fatal( "%s line %d: too many deny users.", | |
964 | filename, linenum); | |
7528d467 | 965 | options->deny_users[options->num_deny_users++] = |
966 | xstrdup(arg); | |
2717fa0f | 967 | } |
968 | break; | |
b2552997 | 969 | |
2717fa0f | 970 | case sAllowGroups: |
971 | while ((arg = strdelim(&cp)) && *arg != '\0') { | |
972 | if (options->num_allow_groups >= MAX_ALLOW_GROUPS) | |
973 | fatal("%s line %d: too many allow groups.", | |
974 | filename, linenum); | |
7528d467 | 975 | options->allow_groups[options->num_allow_groups++] = |
976 | xstrdup(arg); | |
2717fa0f | 977 | } |
978 | break; | |
a8be9f80 | 979 | |
2717fa0f | 980 | case sDenyGroups: |
981 | while ((arg = strdelim(&cp)) && *arg != '\0') { | |
982 | if (options->num_deny_groups >= MAX_DENY_GROUPS) | |
983 | fatal("%s line %d: too many deny groups.", | |
984 | filename, linenum); | |
985 | options->deny_groups[options->num_deny_groups++] = xstrdup(arg); | |
986 | } | |
987 | break; | |
38c295d6 | 988 | |
2717fa0f | 989 | case sCiphers: |
990 | arg = strdelim(&cp); | |
991 | if (!arg || *arg == '\0') | |
992 | fatal("%s line %d: Missing argument.", filename, linenum); | |
993 | if (!ciphers_valid(arg)) | |
994 | fatal("%s line %d: Bad SSH2 cipher spec '%s'.", | |
995 | filename, linenum, arg ? arg : "<NONE>"); | |
996 | if (options->ciphers == NULL) | |
997 | options->ciphers = xstrdup(arg); | |
998 | break; | |
999 | ||
1000 | case sMacs: | |
1001 | arg = strdelim(&cp); | |
1002 | if (!arg || *arg == '\0') | |
1003 | fatal("%s line %d: Missing argument.", filename, linenum); | |
1004 | if (!mac_valid(arg)) | |
1005 | fatal("%s line %d: Bad SSH2 mac spec '%s'.", | |
1006 | filename, linenum, arg ? arg : "<NONE>"); | |
1007 | if (options->macs == NULL) | |
1008 | options->macs = xstrdup(arg); | |
1009 | break; | |
1010 | ||
1011 | case sProtocol: | |
1012 | intptr = &options->protocol; | |
1013 | arg = strdelim(&cp); | |
1014 | if (!arg || *arg == '\0') | |
1015 | fatal("%s line %d: Missing argument.", filename, linenum); | |
1016 | value = proto_spec(arg); | |
1017 | if (value == SSH_PROTO_UNKNOWN) | |
1018 | fatal("%s line %d: Bad protocol spec '%s'.", | |
184eed6a | 1019 | filename, linenum, arg ? arg : "<NONE>"); |
2717fa0f | 1020 | if (*intptr == SSH_PROTO_UNKNOWN) |
1021 | *intptr = value; | |
1022 | break; | |
1023 | ||
1024 | case sSubsystem: | |
1025 | if (options->num_subsystems >= MAX_SUBSYSTEMS) { | |
1026 | fatal("%s line %d: too many subsystems defined.", | |
184eed6a | 1027 | filename, linenum); |
2717fa0f | 1028 | } |
1029 | arg = strdelim(&cp); | |
1030 | if (!arg || *arg == '\0') | |
1031 | fatal("%s line %d: Missing subsystem name.", | |
184eed6a | 1032 | filename, linenum); |
d231781a | 1033 | if (!*activep) { |
1034 | arg = strdelim(&cp); | |
1035 | break; | |
1036 | } | |
2717fa0f | 1037 | for (i = 0; i < options->num_subsystems; i++) |
1038 | if (strcmp(arg, options->subsystem_name[i]) == 0) | |
1039 | fatal("%s line %d: Subsystem '%s' already defined.", | |
184eed6a | 1040 | filename, linenum, arg); |
2717fa0f | 1041 | options->subsystem_name[options->num_subsystems] = xstrdup(arg); |
1042 | arg = strdelim(&cp); | |
1043 | if (!arg || *arg == '\0') | |
1044 | fatal("%s line %d: Missing subsystem command.", | |
184eed6a | 1045 | filename, linenum); |
2717fa0f | 1046 | options->subsystem_command[options->num_subsystems] = xstrdup(arg); |
d66ce1a1 | 1047 | |
1048 | /* Collect arguments (separate to executable) */ | |
1049 | p = xstrdup(arg); | |
1050 | len = strlen(p) + 1; | |
1051 | while ((arg = strdelim(&cp)) != NULL && *arg != '\0') { | |
1052 | len += 1 + strlen(arg); | |
1053 | p = xrealloc(p, 1, len); | |
1054 | strlcat(p, " ", len); | |
1055 | strlcat(p, arg, len); | |
1056 | } | |
1057 | options->subsystem_args[options->num_subsystems] = p; | |
2717fa0f | 1058 | options->num_subsystems++; |
1059 | break; | |
1060 | ||
1061 | case sMaxStartups: | |
1062 | arg = strdelim(&cp); | |
1063 | if (!arg || *arg == '\0') | |
1064 | fatal("%s line %d: Missing MaxStartups spec.", | |
184eed6a | 1065 | filename, linenum); |
2717fa0f | 1066 | if ((n = sscanf(arg, "%d:%d:%d", |
1067 | &options->max_startups_begin, | |
1068 | &options->max_startups_rate, | |
1069 | &options->max_startups)) == 3) { | |
1070 | if (options->max_startups_begin > | |
1071 | options->max_startups || | |
1072 | options->max_startups_rate > 100 || | |
1073 | options->max_startups_rate < 1) | |
c345cf9d | 1074 | fatal("%s line %d: Illegal MaxStartups spec.", |
97de229c | 1075 | filename, linenum); |
2717fa0f | 1076 | } else if (n != 1) |
1077 | fatal("%s line %d: Illegal MaxStartups spec.", | |
1078 | filename, linenum); | |
1079 | else | |
1080 | options->max_startups = options->max_startups_begin; | |
1081 | break; | |
1082 | ||
af4bd935 | 1083 | case sMaxAuthTries: |
1084 | intptr = &options->max_authtries; | |
1085 | goto parse_int; | |
1086 | ||
2717fa0f | 1087 | case sBanner: |
1088 | charptr = &options->banner; | |
1089 | goto parse_filename; | |
1090 | /* | |
1091 | * These options can contain %X options expanded at | |
1092 | * connect time, so that you can specify paths like: | |
1093 | * | |
1094 | * AuthorizedKeysFile /etc/ssh_keys/%u | |
1095 | */ | |
1096 | case sAuthorizedKeysFile: | |
1097 | case sAuthorizedKeysFile2: | |
1098 | charptr = (opcode == sAuthorizedKeysFile ) ? | |
1099 | &options->authorized_keys_file : | |
1100 | &options->authorized_keys_file2; | |
1101 | goto parse_filename; | |
1102 | ||
1103 | case sClientAliveInterval: | |
1104 | intptr = &options->client_alive_interval; | |
1105 | goto parse_time; | |
1106 | ||
1107 | case sClientAliveCountMax: | |
1108 | intptr = &options->client_alive_count_max; | |
1109 | goto parse_int; | |
1110 | ||
61a2c1da | 1111 | case sAcceptEnv: |
1112 | while ((arg = strdelim(&cp)) && *arg != '\0') { | |
1113 | if (strchr(arg, '=') != NULL) | |
1114 | fatal("%s line %d: Invalid environment name.", | |
1115 | filename, linenum); | |
1116 | if (options->num_accept_env >= MAX_ACCEPT_ENV) | |
1117 | fatal("%s line %d: too many allow env.", | |
1118 | filename, linenum); | |
d231781a | 1119 | if (!*activep) |
1120 | break; | |
61a2c1da | 1121 | options->accept_env[options->num_accept_env++] = |
1122 | xstrdup(arg); | |
1123 | } | |
1124 | break; | |
1125 | ||
d20f3c9e | 1126 | case sPermitTunnel: |
1127 | intptr = &options->permit_tun; | |
a4f24bf8 | 1128 | arg = strdelim(&cp); |
1129 | if (!arg || *arg == '\0') | |
1130 | fatal("%s line %d: Missing yes/point-to-point/" | |
1131 | "ethernet/no argument.", filename, linenum); | |
1132 | value = 0; /* silence compiler */ | |
1133 | if (strcasecmp(arg, "ethernet") == 0) | |
1134 | value = SSH_TUNMODE_ETHERNET; | |
1135 | else if (strcasecmp(arg, "point-to-point") == 0) | |
1136 | value = SSH_TUNMODE_POINTOPOINT; | |
1137 | else if (strcasecmp(arg, "yes") == 0) | |
1138 | value = SSH_TUNMODE_YES; | |
1139 | else if (strcasecmp(arg, "no") == 0) | |
1140 | value = SSH_TUNMODE_NO; | |
1141 | else | |
1142 | fatal("%s line %d: Bad yes/point-to-point/ethernet/" | |
1143 | "no argument: %s", filename, linenum, arg); | |
1144 | if (*intptr == -1) | |
1145 | *intptr = value; | |
1146 | break; | |
d20f3c9e | 1147 | |
d231781a | 1148 | case sMatch: |
1149 | if (cmdline) | |
1150 | fatal("Match directive not supported as a command-line " | |
1151 | "option"); | |
1152 | value = match_cfg_line(&cp, linenum, user, host, address); | |
1153 | if (value < 0) | |
1154 | fatal("%s line %d: Bad Match condition", filename, | |
1155 | linenum); | |
1156 | *activep = value; | |
1157 | break; | |
1158 | ||
2fefbadf | 1159 | case sPermitOpen: |
1160 | arg = strdelim(&cp); | |
1161 | if (!arg || *arg == '\0') | |
1162 | fatal("%s line %d: missing PermitOpen specification", | |
1163 | filename, linenum); | |
1164 | if (strcmp(arg, "any") == 0) { | |
ea46e550 | 1165 | if (*activep) { |
2fefbadf | 1166 | channel_clear_adm_permitted_opens(); |
ea46e550 | 1167 | options->num_permitted_opens = 0; |
1168 | } | |
2fefbadf | 1169 | break; |
1170 | } | |
ea46e550 | 1171 | for (; arg != NULL && *arg != '\0'; arg = strdelim(&cp)) { |
1172 | p = hpdelim(&arg); | |
1173 | if (p == NULL) | |
1174 | fatal("%s line %d: missing host in PermitOpen", | |
1175 | filename, linenum); | |
1176 | p = cleanhostname(p); | |
1177 | if (arg == NULL || (port = a2port(arg)) == 0) | |
1178 | fatal("%s line %d: bad port number in " | |
1179 | "PermitOpen", filename, linenum); | |
1180 | if (*activep && options->num_permitted_opens == -1) { | |
1181 | channel_clear_adm_permitted_opens(); | |
1182 | options->num_permitted_opens = | |
1183 | channel_add_adm_permitted_opens(p, port); | |
1184 | } | |
1185 | } | |
2fefbadf | 1186 | break; |
1187 | ||
e7259e8d | 1188 | case sForceCommand: |
1189 | if (cp == NULL) | |
1190 | fatal("%.200s line %d: Missing argument.", filename, | |
1191 | linenum); | |
1192 | len = strspn(cp, WHITESPACE); | |
1193 | if (*activep && options->adm_forced_command == NULL) | |
1194 | options->adm_forced_command = xstrdup(cp + len); | |
1195 | return 0; | |
1196 | ||
2717fa0f | 1197 | case sDeprecated: |
bbe88b6d | 1198 | logit("%s line %d: Deprecated option %s", |
2717fa0f | 1199 | filename, linenum, arg); |
1200 | while (arg) | |
1201 | arg = strdelim(&cp); | |
1202 | break; | |
1203 | ||
a2144546 | 1204 | case sUnsupported: |
1205 | logit("%s line %d: Unsupported option %s", | |
1206 | filename, linenum, arg); | |
1207 | while (arg) | |
1208 | arg = strdelim(&cp); | |
1209 | break; | |
1210 | ||
2717fa0f | 1211 | default: |
1212 | fatal("%s line %d: Missing handler for opcode %s (%d)", | |
1213 | filename, linenum, arg, opcode); | |
1214 | } | |
1215 | if ((arg = strdelim(&cp)) != NULL && *arg != '\0') | |
1216 | fatal("%s line %d: garbage at end of line; \"%.200s\".", | |
1217 | filename, linenum, arg); | |
1218 | return 0; | |
1219 | } | |
089fbbd2 | 1220 | |
2717fa0f | 1221 | /* Reads the server configuration file. */ |
5c53a31e | 1222 | |
2717fa0f | 1223 | void |
b9a549d7 | 1224 | load_server_config(const char *filename, Buffer *conf) |
2717fa0f | 1225 | { |
b9a549d7 | 1226 | char line[1024], *cp; |
7528d467 | 1227 | FILE *f; |
2717fa0f | 1228 | |
b9a549d7 | 1229 | debug2("%s: filename %s", __func__, filename); |
1230 | if ((f = fopen(filename, "r")) == NULL) { | |
2717fa0f | 1231 | perror(filename); |
1232 | exit(1); | |
1233 | } | |
b9a549d7 | 1234 | buffer_clear(conf); |
2717fa0f | 1235 | while (fgets(line, sizeof(line), f)) { |
b9a549d7 | 1236 | /* |
1237 | * Trim out comments and strip whitespace | |
f2107e97 | 1238 | * NB - preserve newlines, they are needed to reproduce |
b9a549d7 | 1239 | * line numbers later for error messages |
1240 | */ | |
1241 | if ((cp = strchr(line, '#')) != NULL) | |
1242 | memcpy(cp, "\n", 2); | |
1243 | cp = line + strspn(line, " \t\r"); | |
1244 | ||
1245 | buffer_append(conf, cp, strlen(cp)); | |
8efc0c15 | 1246 | } |
b9a549d7 | 1247 | buffer_append(conf, "\0", 1); |
5260325f | 1248 | fclose(f); |
b9a549d7 | 1249 | debug2("%s: done config len = %d", __func__, buffer_len(conf)); |
1250 | } | |
1251 | ||
1252 | void | |
d231781a | 1253 | parse_server_match_config(ServerOptions *options, const char *user, |
1254 | const char *host, const char *address) | |
1255 | { | |
1256 | ServerOptions mo; | |
1257 | ||
1258 | initialize_server_options(&mo); | |
1259 | parse_server_config(&mo, "reprocess config", &cfg, user, host, address); | |
1260 | copy_set_server_options(options, &mo); | |
1261 | } | |
1262 | ||
1263 | /* Copy any (supported) values that are set */ | |
1264 | void | |
1265 | copy_set_server_options(ServerOptions *dst, ServerOptions *src) | |
1266 | { | |
1267 | if (src->allow_tcp_forwarding != -1) | |
1268 | dst->allow_tcp_forwarding = src->allow_tcp_forwarding; | |
1269 | if (src->gateway_ports != -1) | |
1270 | dst->gateway_ports = src->gateway_ports; | |
e7259e8d | 1271 | if (src->adm_forced_command != NULL) { |
1272 | if (dst->adm_forced_command != NULL) | |
1273 | xfree(dst->adm_forced_command); | |
1274 | dst->adm_forced_command = src->adm_forced_command; | |
1275 | } | |
691712e0 | 1276 | if (src->x11_display_offset != -1) |
1277 | dst->x11_display_offset = src->x11_display_offset; | |
1278 | if (src->x11_forwarding != -1) | |
1279 | dst->x11_forwarding = src->x11_forwarding; | |
1280 | if (src->x11_use_localhost != -1) | |
1281 | dst->x11_use_localhost = src->x11_use_localhost; | |
d231781a | 1282 | } |
1283 | ||
1284 | void | |
1285 | parse_server_config(ServerOptions *options, const char *filename, Buffer *conf, | |
1286 | const char *user, const char *host, const char *address) | |
b9a549d7 | 1287 | { |
d231781a | 1288 | int active, linenum, bad_options = 0; |
16acb158 | 1289 | char *cp, *obuf, *cbuf; |
b9a549d7 | 1290 | |
1291 | debug2("%s: config %s len %d", __func__, filename, buffer_len(conf)); | |
1292 | ||
16acb158 | 1293 | obuf = cbuf = xstrdup(buffer_ptr(conf)); |
d231781a | 1294 | active = user ? 0 : 1; |
861cc543 | 1295 | linenum = 1; |
f8cc7664 | 1296 | while ((cp = strsep(&cbuf, "\n")) != NULL) { |
b9a549d7 | 1297 | if (process_server_config_line(options, cp, filename, |
d231781a | 1298 | linenum++, &active, user, host, address) != 0) |
b9a549d7 | 1299 | bad_options++; |
1300 | } | |
16acb158 | 1301 | xfree(obuf); |
b7c70970 | 1302 | if (bad_options > 0) |
1303 | fatal("%s: terminating, %d bad configuration options", | |
1304 | filename, bad_options); | |
8efc0c15 | 1305 | } |