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d4f40d92 | 1 | /* $OpenBSD: servconf.c,v 1.163 2006/08/01 23:36:12 stevesk Exp $ */ |
8efc0c15 | 2 | /* |
5260325f | 3 | * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland |
4 | * All rights reserved | |
6ae2364d | 5 | * |
bcbf86ec | 6 | * As far as I am concerned, the code I have written for this software |
7 | * can be used freely for any purpose. Any derived versions of this | |
8 | * software must be clearly marked as such, and if the derived work is | |
9 | * incompatible with the protocol description in the RFC file, it must be | |
10 | * called by a name other than "ssh" or "Secure Shell". | |
5260325f | 11 | */ |
8efc0c15 | 12 | |
13 | #include "includes.h" | |
8efc0c15 | 14 | |
5b04a8bf | 15 | #include <sys/types.h> |
16 | #include <sys/socket.h> | |
17 | ||
28cb0a43 | 18 | #include <netdb.h> |
cf851879 | 19 | #include <stdio.h> |
ffa517a8 | 20 | #include <stdlib.h> |
00146caa | 21 | #include <string.h> |
5188ba17 | 22 | #include <unistd.h> |
c8dfff33 | 23 | |
8efc0c15 | 24 | #include "ssh.h" |
42f11eb2 | 25 | #include "log.h" |
8efc0c15 | 26 | #include "servconf.h" |
27 | #include "xmalloc.h" | |
a8be9f80 | 28 | #include "compat.h" |
42f11eb2 | 29 | #include "pathnames.h" |
42f11eb2 | 30 | #include "misc.h" |
31 | #include "cipher.h" | |
b2552997 | 32 | #include "kex.h" |
33 | #include "mac.h" | |
d231781a | 34 | #include "match.h" |
2fefbadf | 35 | #include "channels.h" |
42f11eb2 | 36 | |
396c147e | 37 | static void add_listen_addr(ServerOptions *, char *, u_short); |
38 | static void add_one_listen_addr(ServerOptions *, char *, u_short); | |
48e671d5 | 39 | |
1853d1ef | 40 | /* Use of privilege separation or not */ |
41 | extern int use_privsep; | |
d231781a | 42 | extern Buffer cfg; |
42f11eb2 | 43 | |
8efc0c15 | 44 | /* Initializes the server options to their default values. */ |
45 | ||
6ae2364d | 46 | void |
5260325f | 47 | initialize_server_options(ServerOptions *options) |
8efc0c15 | 48 | { |
5260325f | 49 | memset(options, 0, sizeof(*options)); |
e15895cd | 50 | |
51 | /* Portable-specific options */ | |
7fceb20d | 52 | options->use_pam = -1; |
e15895cd | 53 | |
54 | /* Standard Options */ | |
48e671d5 | 55 | options->num_ports = 0; |
56 | options->ports_from_cmdline = 0; | |
57 | options->listen_addrs = NULL; | |
31b41ceb | 58 | options->address_family = -1; |
fa08c86b | 59 | options->num_host_key_files = 0; |
0fbe8c74 | 60 | options->pid_file = NULL; |
5260325f | 61 | options->server_key_bits = -1; |
62 | options->login_grace_time = -1; | |
63 | options->key_regeneration_time = -1; | |
15853e93 | 64 | options->permit_root_login = PERMIT_NOT_SET; |
5260325f | 65 | options->ignore_rhosts = -1; |
66 | options->ignore_user_known_hosts = -1; | |
67 | options->print_motd = -1; | |
4f4648f9 | 68 | options->print_lastlog = -1; |
5260325f | 69 | options->x11_forwarding = -1; |
70 | options->x11_display_offset = -1; | |
e6e573bd | 71 | options->x11_use_localhost = -1; |
fa649821 | 72 | options->xauth_location = NULL; |
5260325f | 73 | options->strict_modes = -1; |
fd573618 | 74 | options->tcp_keep_alive = -1; |
5eaf8578 | 75 | options->log_facility = SYSLOG_FACILITY_NOT_SET; |
76 | options->log_level = SYSLOG_LEVEL_NOT_SET; | |
5260325f | 77 | options->rhosts_rsa_authentication = -1; |
8002af61 | 78 | options->hostbased_authentication = -1; |
79 | options->hostbased_uses_name_from_packet_only = -1; | |
5260325f | 80 | options->rsa_authentication = -1; |
fa08c86b | 81 | options->pubkey_authentication = -1; |
5260325f | 82 | options->kerberos_authentication = -1; |
83 | options->kerberos_or_local_passwd = -1; | |
84 | options->kerberos_ticket_cleanup = -1; | |
a1e30b47 | 85 | options->kerberos_get_afs_token = -1; |
7364bd04 | 86 | options->gss_authentication=-1; |
87 | options->gss_cleanup_creds = -1; | |
5260325f | 88 | options->password_authentication = -1; |
94ec8c6b | 89 | options->kbd_interactive_authentication = -1; |
5ba55ada | 90 | options->challenge_response_authentication = -1; |
5260325f | 91 | options->permit_empty_passwd = -1; |
f00bab84 | 92 | options->permit_user_env = -1; |
5260325f | 93 | options->use_login = -1; |
636f76ca | 94 | options->compression = -1; |
33de75a3 | 95 | options->allow_tcp_forwarding = -1; |
5260325f | 96 | options->num_allow_users = 0; |
97 | options->num_deny_users = 0; | |
98 | options->num_allow_groups = 0; | |
99 | options->num_deny_groups = 0; | |
a8be9f80 | 100 | options->ciphers = NULL; |
b2552997 | 101 | options->macs = NULL; |
a8be9f80 | 102 | options->protocol = SSH_PROTO_UNKNOWN; |
1d1ffb87 | 103 | options->gateway_ports = -1; |
38c295d6 | 104 | options->num_subsystems = 0; |
c345cf9d | 105 | options->max_startups_begin = -1; |
106 | options->max_startups_rate = -1; | |
089fbbd2 | 107 | options->max_startups = -1; |
af4bd935 | 108 | options->max_authtries = -1; |
eea39c02 | 109 | options->banner = NULL; |
c5a7d788 | 110 | options->use_dns = -1; |
3ffc6336 | 111 | options->client_alive_interval = -1; |
112 | options->client_alive_count_max = -1; | |
c8445989 | 113 | options->authorized_keys_file = NULL; |
114 | options->authorized_keys_file2 = NULL; | |
61a2c1da | 115 | options->num_accept_env = 0; |
d20f3c9e | 116 | options->permit_tun = -1; |
ea46e550 | 117 | options->num_permitted_opens = -1; |
e7259e8d | 118 | options->adm_forced_command = NULL; |
8efc0c15 | 119 | } |
120 | ||
6ae2364d | 121 | void |
5260325f | 122 | fill_default_server_options(ServerOptions *options) |
8efc0c15 | 123 | { |
e15895cd | 124 | /* Portable-specific options */ |
7fceb20d | 125 | if (options->use_pam == -1) |
0a23d79f | 126 | options->use_pam = 0; |
e15895cd | 127 | |
128 | /* Standard Options */ | |
fa08c86b | 129 | if (options->protocol == SSH_PROTO_UNKNOWN) |
130 | options->protocol = SSH_PROTO_1|SSH_PROTO_2; | |
131 | if (options->num_host_key_files == 0) { | |
132 | /* fill default hostkeys for protocols */ | |
133 | if (options->protocol & SSH_PROTO_1) | |
0f84fe37 | 134 | options->host_key_files[options->num_host_key_files++] = |
135 | _PATH_HOST_KEY_FILE; | |
136 | if (options->protocol & SSH_PROTO_2) { | |
137 | options->host_key_files[options->num_host_key_files++] = | |
138 | _PATH_HOST_RSA_KEY_FILE; | |
139 | options->host_key_files[options->num_host_key_files++] = | |
140 | _PATH_HOST_DSA_KEY_FILE; | |
141 | } | |
fa08c86b | 142 | } |
48e671d5 | 143 | if (options->num_ports == 0) |
144 | options->ports[options->num_ports++] = SSH_DEFAULT_PORT; | |
145 | if (options->listen_addrs == NULL) | |
2d2a2c65 | 146 | add_listen_addr(options, NULL, 0); |
0fbe8c74 | 147 | if (options->pid_file == NULL) |
42f11eb2 | 148 | options->pid_file = _PATH_SSH_DAEMON_PID_FILE; |
5260325f | 149 | if (options->server_key_bits == -1) |
150 | options->server_key_bits = 768; | |
151 | if (options->login_grace_time == -1) | |
3445ca02 | 152 | options->login_grace_time = 120; |
5260325f | 153 | if (options->key_regeneration_time == -1) |
154 | options->key_regeneration_time = 3600; | |
15853e93 | 155 | if (options->permit_root_login == PERMIT_NOT_SET) |
156 | options->permit_root_login = PERMIT_YES; | |
5260325f | 157 | if (options->ignore_rhosts == -1) |
c8d54615 | 158 | options->ignore_rhosts = 1; |
5260325f | 159 | if (options->ignore_user_known_hosts == -1) |
160 | options->ignore_user_known_hosts = 0; | |
5260325f | 161 | if (options->print_motd == -1) |
162 | options->print_motd = 1; | |
4f4648f9 | 163 | if (options->print_lastlog == -1) |
164 | options->print_lastlog = 1; | |
5260325f | 165 | if (options->x11_forwarding == -1) |
c8d54615 | 166 | options->x11_forwarding = 0; |
5260325f | 167 | if (options->x11_display_offset == -1) |
c8d54615 | 168 | options->x11_display_offset = 10; |
e6e573bd | 169 | if (options->x11_use_localhost == -1) |
170 | options->x11_use_localhost = 1; | |
fa649821 | 171 | if (options->xauth_location == NULL) |
fd9ede94 | 172 | options->xauth_location = _PATH_XAUTH; |
5260325f | 173 | if (options->strict_modes == -1) |
174 | options->strict_modes = 1; | |
fd573618 | 175 | if (options->tcp_keep_alive == -1) |
176 | options->tcp_keep_alive = 1; | |
5eaf8578 | 177 | if (options->log_facility == SYSLOG_FACILITY_NOT_SET) |
5260325f | 178 | options->log_facility = SYSLOG_FACILITY_AUTH; |
5eaf8578 | 179 | if (options->log_level == SYSLOG_LEVEL_NOT_SET) |
59c97189 | 180 | options->log_level = SYSLOG_LEVEL_INFO; |
5260325f | 181 | if (options->rhosts_rsa_authentication == -1) |
c8d54615 | 182 | options->rhosts_rsa_authentication = 0; |
8002af61 | 183 | if (options->hostbased_authentication == -1) |
184 | options->hostbased_authentication = 0; | |
185 | if (options->hostbased_uses_name_from_packet_only == -1) | |
186 | options->hostbased_uses_name_from_packet_only = 0; | |
5260325f | 187 | if (options->rsa_authentication == -1) |
188 | options->rsa_authentication = 1; | |
fa08c86b | 189 | if (options->pubkey_authentication == -1) |
190 | options->pubkey_authentication = 1; | |
5260325f | 191 | if (options->kerberos_authentication == -1) |
eadc806d | 192 | options->kerberos_authentication = 0; |
5260325f | 193 | if (options->kerberos_or_local_passwd == -1) |
194 | options->kerberos_or_local_passwd = 1; | |
195 | if (options->kerberos_ticket_cleanup == -1) | |
196 | options->kerberos_ticket_cleanup = 1; | |
a1e30b47 | 197 | if (options->kerberos_get_afs_token == -1) |
198 | options->kerberos_get_afs_token = 0; | |
7364bd04 | 199 | if (options->gss_authentication == -1) |
200 | options->gss_authentication = 0; | |
201 | if (options->gss_cleanup_creds == -1) | |
202 | options->gss_cleanup_creds = 1; | |
5260325f | 203 | if (options->password_authentication == -1) |
204 | options->password_authentication = 1; | |
94ec8c6b | 205 | if (options->kbd_interactive_authentication == -1) |
206 | options->kbd_interactive_authentication = 0; | |
5ba55ada | 207 | if (options->challenge_response_authentication == -1) |
208 | options->challenge_response_authentication = 1; | |
5260325f | 209 | if (options->permit_empty_passwd == -1) |
c8d54615 | 210 | options->permit_empty_passwd = 0; |
f00bab84 | 211 | if (options->permit_user_env == -1) |
212 | options->permit_user_env = 0; | |
5260325f | 213 | if (options->use_login == -1) |
214 | options->use_login = 0; | |
636f76ca | 215 | if (options->compression == -1) |
07200973 | 216 | options->compression = COMP_DELAYED; |
33de75a3 | 217 | if (options->allow_tcp_forwarding == -1) |
218 | options->allow_tcp_forwarding = 1; | |
1d1ffb87 | 219 | if (options->gateway_ports == -1) |
220 | options->gateway_ports = 0; | |
089fbbd2 | 221 | if (options->max_startups == -1) |
222 | options->max_startups = 10; | |
c345cf9d | 223 | if (options->max_startups_rate == -1) |
224 | options->max_startups_rate = 100; /* 100% */ | |
225 | if (options->max_startups_begin == -1) | |
226 | options->max_startups_begin = options->max_startups; | |
af4bd935 | 227 | if (options->max_authtries == -1) |
228 | options->max_authtries = DEFAULT_AUTH_FAIL_MAX; | |
c5a7d788 | 229 | if (options->use_dns == -1) |
230 | options->use_dns = 1; | |
3ffc6336 | 231 | if (options->client_alive_interval == -1) |
184eed6a | 232 | options->client_alive_interval = 0; |
3ffc6336 | 233 | if (options->client_alive_count_max == -1) |
234 | options->client_alive_count_max = 3; | |
5df83e07 | 235 | if (options->authorized_keys_file2 == NULL) { |
236 | /* authorized_keys_file2 falls back to authorized_keys_file */ | |
237 | if (options->authorized_keys_file != NULL) | |
238 | options->authorized_keys_file2 = options->authorized_keys_file; | |
239 | else | |
240 | options->authorized_keys_file2 = _PATH_SSH_USER_PERMITTED_KEYS2; | |
241 | } | |
242 | if (options->authorized_keys_file == NULL) | |
243 | options->authorized_keys_file = _PATH_SSH_USER_PERMITTED_KEYS; | |
d20f3c9e | 244 | if (options->permit_tun == -1) |
a4f24bf8 | 245 | options->permit_tun = SSH_TUNMODE_NO; |
1853d1ef | 246 | |
2ee1b704 | 247 | /* Turn privilege separation on by default */ |
1853d1ef | 248 | if (use_privsep == -1) |
2ee1b704 | 249 | use_privsep = 1; |
e299a298 | 250 | |
4165b82e | 251 | #ifndef HAVE_MMAP |
e299a298 | 252 | if (use_privsep && options->compression == 1) { |
253 | error("This platform does not support both privilege " | |
254 | "separation and compression"); | |
255 | error("Compression disabled"); | |
256 | options->compression = 0; | |
257 | } | |
258 | #endif | |
259 | ||
8efc0c15 | 260 | } |
261 | ||
8efc0c15 | 262 | /* Keyword tokens. */ |
5260325f | 263 | typedef enum { |
264 | sBadOption, /* == unknown option */ | |
e15895cd | 265 | /* Portable-specific options */ |
7fceb20d | 266 | sUsePAM, |
e15895cd | 267 | /* Standard Options */ |
5260325f | 268 | sPort, sHostKeyFile, sServerKeyBits, sLoginGraceTime, sKeyRegenerationTime, |
269 | sPermitRootLogin, sLogFacility, sLogLevel, | |
0598d99d | 270 | sRhostsRSAAuthentication, sRSAAuthentication, |
5260325f | 271 | sKerberosAuthentication, sKerberosOrLocalPasswd, sKerberosTicketCleanup, |
a1e30b47 | 272 | sKerberosGetAFSToken, |
1c590258 | 273 | sKerberosTgtPassing, sChallengeResponseAuthentication, |
31b41ceb | 274 | sPasswordAuthentication, sKbdInteractiveAuthentication, |
275 | sListenAddress, sAddressFamily, | |
4f4648f9 | 276 | sPrintMotd, sPrintLastLog, sIgnoreRhosts, |
e6e573bd | 277 | sX11Forwarding, sX11DisplayOffset, sX11UseLocalhost, |
fd573618 | 278 | sStrictModes, sEmptyPasswd, sTCPKeepAlive, |
f00bab84 | 279 | sPermitUserEnvironment, sUseLogin, sAllowTcpForwarding, sCompression, |
33de75a3 | 280 | sAllowUsers, sDenyUsers, sAllowGroups, sDenyGroups, |
b2552997 | 281 | sIgnoreUserKnownHosts, sCiphers, sMacs, sProtocol, sPidFile, |
af4bd935 | 282 | sGatewayPorts, sPubkeyAuthentication, sXAuthLocation, sSubsystem, |
283 | sMaxStartups, sMaxAuthTries, | |
c5a7d788 | 284 | sBanner, sUseDNS, sHostbasedAuthentication, |
184eed6a | 285 | sHostbasedUsesNameFromPacketOnly, sClientAliveInterval, |
c8445989 | 286 | sClientAliveCountMax, sAuthorizedKeysFile, sAuthorizedKeysFile2, |
d20f3c9e | 287 | sGssAuthentication, sGssCleanupCreds, sAcceptEnv, sPermitTunnel, |
e7259e8d | 288 | sMatch, sPermitOpen, sForceCommand, |
2ea6de2b | 289 | sUsePrivilegeSeparation, |
a2144546 | 290 | sDeprecated, sUnsupported |
8efc0c15 | 291 | } ServerOpCodes; |
292 | ||
d231781a | 293 | #define SSHCFG_GLOBAL 0x01 /* allowed in main section of sshd_config */ |
294 | #define SSHCFG_MATCH 0x02 /* allowed inside a Match section */ | |
295 | #define SSHCFG_ALL (SSHCFG_GLOBAL|SSHCFG_MATCH) | |
296 | ||
8efc0c15 | 297 | /* Textual representation of the tokens. */ |
5260325f | 298 | static struct { |
299 | const char *name; | |
300 | ServerOpCodes opcode; | |
d231781a | 301 | u_int flags; |
5260325f | 302 | } keywords[] = { |
e15895cd | 303 | /* Portable-specific options */ |
b06b11ad | 304 | #ifdef USE_PAM |
d231781a | 305 | { "usepam", sUsePAM, SSHCFG_GLOBAL }, |
b06b11ad | 306 | #else |
d231781a | 307 | { "usepam", sUnsupported, SSHCFG_GLOBAL }, |
b06b11ad | 308 | #endif |
d231781a | 309 | { "pamauthenticationviakbdint", sDeprecated, SSHCFG_GLOBAL }, |
e15895cd | 310 | /* Standard Options */ |
d231781a | 311 | { "port", sPort, SSHCFG_GLOBAL }, |
312 | { "hostkey", sHostKeyFile, SSHCFG_GLOBAL }, | |
313 | { "hostdsakey", sHostKeyFile, SSHCFG_GLOBAL }, /* alias */ | |
314 | { "pidfile", sPidFile, SSHCFG_GLOBAL }, | |
315 | { "serverkeybits", sServerKeyBits, SSHCFG_GLOBAL }, | |
316 | { "logingracetime", sLoginGraceTime, SSHCFG_GLOBAL }, | |
317 | { "keyregenerationinterval", sKeyRegenerationTime, SSHCFG_GLOBAL }, | |
318 | { "permitrootlogin", sPermitRootLogin, SSHCFG_GLOBAL }, | |
319 | { "syslogfacility", sLogFacility, SSHCFG_GLOBAL }, | |
320 | { "loglevel", sLogLevel, SSHCFG_GLOBAL }, | |
321 | { "rhostsauthentication", sDeprecated, SSHCFG_GLOBAL }, | |
322 | { "rhostsrsaauthentication", sRhostsRSAAuthentication, SSHCFG_GLOBAL }, | |
323 | { "hostbasedauthentication", sHostbasedAuthentication, SSHCFG_GLOBAL }, | |
324 | { "hostbasedusesnamefrompacketonly", sHostbasedUsesNameFromPacketOnly, SSHCFG_GLOBAL }, | |
325 | { "rsaauthentication", sRSAAuthentication, SSHCFG_GLOBAL }, | |
326 | { "pubkeyauthentication", sPubkeyAuthentication, SSHCFG_GLOBAL }, | |
327 | { "dsaauthentication", sPubkeyAuthentication, SSHCFG_GLOBAL }, /* alias */ | |
1c590258 | 328 | #ifdef KRB5 |
d231781a | 329 | { "kerberosauthentication", sKerberosAuthentication, SSHCFG_GLOBAL }, |
330 | { "kerberosorlocalpasswd", sKerberosOrLocalPasswd, SSHCFG_GLOBAL }, | |
331 | { "kerberosticketcleanup", sKerberosTicketCleanup, SSHCFG_GLOBAL }, | |
bcfcc5f9 | 332 | #ifdef USE_AFS |
d231781a | 333 | { "kerberosgetafstoken", sKerberosGetAFSToken, SSHCFG_GLOBAL }, |
309af4e5 | 334 | #else |
d231781a | 335 | { "kerberosgetafstoken", sUnsupported, SSHCFG_GLOBAL }, |
309af4e5 | 336 | #endif |
a2144546 | 337 | #else |
d231781a | 338 | { "kerberosauthentication", sUnsupported, SSHCFG_GLOBAL }, |
339 | { "kerberosorlocalpasswd", sUnsupported, SSHCFG_GLOBAL }, | |
340 | { "kerberosticketcleanup", sUnsupported, SSHCFG_GLOBAL }, | |
341 | { "kerberosgetafstoken", sUnsupported, SSHCFG_GLOBAL }, | |
a2144546 | 342 | #endif |
d231781a | 343 | { "kerberostgtpassing", sUnsupported, SSHCFG_GLOBAL }, |
344 | { "afstokenpassing", sUnsupported, SSHCFG_GLOBAL }, | |
7364bd04 | 345 | #ifdef GSSAPI |
d231781a | 346 | { "gssapiauthentication", sGssAuthentication, SSHCFG_GLOBAL }, |
347 | { "gssapicleanupcredentials", sGssCleanupCreds, SSHCFG_GLOBAL }, | |
7364bd04 | 348 | #else |
d231781a | 349 | { "gssapiauthentication", sUnsupported, SSHCFG_GLOBAL }, |
350 | { "gssapicleanupcredentials", sUnsupported, SSHCFG_GLOBAL }, | |
7364bd04 | 351 | #endif |
d231781a | 352 | { "passwordauthentication", sPasswordAuthentication, SSHCFG_GLOBAL }, |
353 | { "kbdinteractiveauthentication", sKbdInteractiveAuthentication, SSHCFG_GLOBAL }, | |
354 | { "challengeresponseauthentication", sChallengeResponseAuthentication, SSHCFG_GLOBAL }, | |
355 | { "skeyauthentication", sChallengeResponseAuthentication, SSHCFG_GLOBAL }, /* alias */ | |
356 | { "checkmail", sDeprecated, SSHCFG_GLOBAL }, | |
357 | { "listenaddress", sListenAddress, SSHCFG_GLOBAL }, | |
358 | { "addressfamily", sAddressFamily, SSHCFG_GLOBAL }, | |
359 | { "printmotd", sPrintMotd, SSHCFG_GLOBAL }, | |
360 | { "printlastlog", sPrintLastLog, SSHCFG_GLOBAL }, | |
361 | { "ignorerhosts", sIgnoreRhosts, SSHCFG_GLOBAL }, | |
362 | { "ignoreuserknownhosts", sIgnoreUserKnownHosts, SSHCFG_GLOBAL }, | |
691712e0 | 363 | { "x11forwarding", sX11Forwarding, SSHCFG_ALL }, |
364 | { "x11displayoffset", sX11DisplayOffset, SSHCFG_ALL }, | |
365 | { "x11uselocalhost", sX11UseLocalhost, SSHCFG_ALL }, | |
d231781a | 366 | { "xauthlocation", sXAuthLocation, SSHCFG_GLOBAL }, |
367 | { "strictmodes", sStrictModes, SSHCFG_GLOBAL }, | |
368 | { "permitemptypasswords", sEmptyPasswd, SSHCFG_GLOBAL }, | |
369 | { "permituserenvironment", sPermitUserEnvironment, SSHCFG_GLOBAL }, | |
370 | { "uselogin", sUseLogin, SSHCFG_GLOBAL }, | |
371 | { "compression", sCompression, SSHCFG_GLOBAL }, | |
372 | { "tcpkeepalive", sTCPKeepAlive, SSHCFG_GLOBAL }, | |
373 | { "keepalive", sTCPKeepAlive, SSHCFG_GLOBAL }, /* obsolete alias */ | |
374 | { "allowtcpforwarding", sAllowTcpForwarding, SSHCFG_ALL }, | |
375 | { "allowusers", sAllowUsers, SSHCFG_GLOBAL }, | |
376 | { "denyusers", sDenyUsers, SSHCFG_GLOBAL }, | |
377 | { "allowgroups", sAllowGroups, SSHCFG_GLOBAL }, | |
378 | { "denygroups", sDenyGroups, SSHCFG_GLOBAL }, | |
379 | { "ciphers", sCiphers, SSHCFG_GLOBAL }, | |
380 | { "macs", sMacs, SSHCFG_GLOBAL }, | |
381 | { "protocol", sProtocol, SSHCFG_GLOBAL }, | |
382 | { "gatewayports", sGatewayPorts, SSHCFG_ALL }, | |
383 | { "subsystem", sSubsystem, SSHCFG_GLOBAL }, | |
384 | { "maxstartups", sMaxStartups, SSHCFG_GLOBAL }, | |
385 | { "maxauthtries", sMaxAuthTries, SSHCFG_GLOBAL }, | |
386 | { "banner", sBanner, SSHCFG_GLOBAL }, | |
387 | { "usedns", sUseDNS, SSHCFG_GLOBAL }, | |
388 | { "verifyreversemapping", sDeprecated, SSHCFG_GLOBAL }, | |
389 | { "reversemappingcheck", sDeprecated, SSHCFG_GLOBAL }, | |
390 | { "clientaliveinterval", sClientAliveInterval, SSHCFG_GLOBAL }, | |
391 | { "clientalivecountmax", sClientAliveCountMax, SSHCFG_GLOBAL }, | |
392 | { "authorizedkeysfile", sAuthorizedKeysFile, SSHCFG_GLOBAL }, | |
393 | { "authorizedkeysfile2", sAuthorizedKeysFile2, SSHCFG_GLOBAL }, | |
394 | { "useprivilegeseparation", sUsePrivilegeSeparation, SSHCFG_GLOBAL }, | |
395 | { "acceptenv", sAcceptEnv, SSHCFG_GLOBAL }, | |
396 | { "permittunnel", sPermitTunnel, SSHCFG_GLOBAL }, | |
2fefbadf | 397 | { "match", sMatch, SSHCFG_ALL }, |
398 | { "permitopen", sPermitOpen, SSHCFG_ALL }, | |
e7259e8d | 399 | { "forcecommand", sForceCommand, SSHCFG_ALL }, |
d231781a | 400 | { NULL, sBadOption, 0 } |
8efc0c15 | 401 | }; |
402 | ||
aa3378df | 403 | /* |
6be9a5e8 | 404 | * Returns the number of the token pointed to by cp or sBadOption. |
aa3378df | 405 | */ |
8efc0c15 | 406 | |
6ae2364d | 407 | static ServerOpCodes |
5260325f | 408 | parse_token(const char *cp, const char *filename, |
d231781a | 409 | int linenum, u_int *flags) |
8efc0c15 | 410 | { |
1e3b8b07 | 411 | u_int i; |
8efc0c15 | 412 | |
5260325f | 413 | for (i = 0; keywords[i].name; i++) |
d231781a | 414 | if (strcasecmp(cp, keywords[i].name) == 0) { |
415 | *flags = keywords[i].flags; | |
5260325f | 416 | return keywords[i].opcode; |
d231781a | 417 | } |
8efc0c15 | 418 | |
b7c70970 | 419 | error("%s: line %d: Bad configuration option: %s", |
420 | filename, linenum, cp); | |
5260325f | 421 | return sBadOption; |
8efc0c15 | 422 | } |
423 | ||
396c147e | 424 | static void |
2d2a2c65 | 425 | add_listen_addr(ServerOptions *options, char *addr, u_short port) |
48e671d5 | 426 | { |
2ceb8101 | 427 | u_int i; |
48e671d5 | 428 | |
429 | if (options->num_ports == 0) | |
430 | options->ports[options->num_ports++] = SSH_DEFAULT_PORT; | |
31b41ceb | 431 | if (options->address_family == -1) |
432 | options->address_family = AF_UNSPEC; | |
2d2a2c65 | 433 | if (port == 0) |
d11c1288 | 434 | for (i = 0; i < options->num_ports; i++) |
435 | add_one_listen_addr(options, addr, options->ports[i]); | |
436 | else | |
2d2a2c65 | 437 | add_one_listen_addr(options, addr, port); |
d11c1288 | 438 | } |
439 | ||
396c147e | 440 | static void |
d11c1288 | 441 | add_one_listen_addr(ServerOptions *options, char *addr, u_short port) |
442 | { | |
443 | struct addrinfo hints, *ai, *aitop; | |
444 | char strport[NI_MAXSERV]; | |
445 | int gaierr; | |
446 | ||
447 | memset(&hints, 0, sizeof(hints)); | |
31b41ceb | 448 | hints.ai_family = options->address_family; |
d11c1288 | 449 | hints.ai_socktype = SOCK_STREAM; |
450 | hints.ai_flags = (addr == NULL) ? AI_PASSIVE : 0; | |
7528d467 | 451 | snprintf(strport, sizeof strport, "%u", port); |
d11c1288 | 452 | if ((gaierr = getaddrinfo(addr, strport, &hints, &aitop)) != 0) |
453 | fatal("bad addr or host: %s (%s)", | |
454 | addr ? addr : "<NULL>", | |
455 | gai_strerror(gaierr)); | |
456 | for (ai = aitop; ai->ai_next; ai = ai->ai_next) | |
457 | ; | |
458 | ai->ai_next = options->listen_addrs; | |
459 | options->listen_addrs = aitop; | |
48e671d5 | 460 | } |
461 | ||
d231781a | 462 | /* |
463 | * The strategy for the Match blocks is that the config file is parsed twice. | |
464 | * | |
465 | * The first time is at startup. activep is initialized to 1 and the | |
466 | * directives in the global context are processed and acted on. Hitting a | |
467 | * Match directive unsets activep and the directives inside the block are | |
468 | * checked for syntax only. | |
469 | * | |
470 | * The second time is after a connection has been established but before | |
471 | * authentication. activep is initialized to 2 and global config directives | |
472 | * are ignored since they have already been processed. If the criteria in a | |
473 | * Match block is met, activep is set and the subsequent directives | |
474 | * processed and actioned until EOF or another Match block unsets it. Any | |
475 | * options set are copied into the main server config. | |
476 | * | |
477 | * Potential additions/improvements: | |
478 | * - Add Match support for pre-kex directives, eg Protocol, Ciphers. | |
479 | * | |
480 | * - Add a Tag directive (idea from David Leonard) ala pf, eg: | |
481 | * Match Address 192.168.0.* | |
482 | * Tag trusted | |
483 | * Match Group wheel | |
484 | * Tag trusted | |
485 | * Match Tag trusted | |
486 | * AllowTcpForwarding yes | |
487 | * GatewayPorts clientspecified | |
488 | * [...] | |
489 | * | |
490 | * - Add a PermittedChannelRequests directive | |
491 | * Match Group shell | |
492 | * PermittedChannelRequests session,forwarded-tcpip | |
493 | */ | |
494 | ||
495 | static int | |
496 | match_cfg_line(char **condition, int line, const char *user, const char *host, | |
497 | const char *address) | |
498 | { | |
499 | int result = 1; | |
500 | char *arg, *attrib, *cp = *condition; | |
501 | size_t len; | |
502 | ||
503 | if (user == NULL) | |
504 | debug3("checking syntax for 'Match %s'", cp); | |
505 | else | |
506 | debug3("checking match for '%s' user %s host %s addr %s", cp, | |
507 | user ? user : "(null)", host ? host : "(null)", | |
508 | address ? address : "(null)"); | |
509 | ||
510 | while ((attrib = strdelim(&cp)) && *attrib != '\0') { | |
511 | if ((arg = strdelim(&cp)) == NULL || *arg == '\0') { | |
512 | error("Missing Match criteria for %s", attrib); | |
513 | return -1; | |
514 | } | |
515 | len = strlen(arg); | |
516 | if (strcasecmp(attrib, "user") == 0) { | |
517 | if (!user) { | |
518 | result = 0; | |
519 | continue; | |
520 | } | |
521 | if (match_pattern_list(user, arg, len, 0) != 1) | |
522 | result = 0; | |
523 | else | |
524 | debug("user %.100s matched 'User %.100s' at " | |
525 | "line %d", user, arg, line); | |
526 | } else if (strcasecmp(attrib, "host") == 0) { | |
527 | if (!host) { | |
528 | result = 0; | |
529 | continue; | |
530 | } | |
531 | if (match_hostname(host, arg, len) != 1) | |
532 | result = 0; | |
533 | else | |
534 | debug("connection from %.100s matched 'Host " | |
535 | "%.100s' at line %d", host, arg, line); | |
536 | } else if (strcasecmp(attrib, "address") == 0) { | |
537 | debug("address '%s' arg '%s'", address, arg); | |
538 | if (!address) { | |
539 | result = 0; | |
540 | continue; | |
541 | } | |
542 | if (match_hostname(address, arg, len) != 1) | |
543 | result = 0; | |
544 | else | |
545 | debug("connection from %.100s matched 'Address " | |
546 | "%.100s' at line %d", address, arg, line); | |
547 | } else { | |
548 | error("Unsupported Match attribute %s", attrib); | |
549 | return -1; | |
550 | } | |
551 | } | |
552 | if (user != NULL) | |
553 | debug3("match %sfound", result ? "" : "not "); | |
554 | *condition = cp; | |
555 | return result; | |
556 | } | |
557 | ||
e7259e8d | 558 | #define WHITESPACE " \t\r\n" |
559 | ||
2717fa0f | 560 | int |
561 | process_server_config_line(ServerOptions *options, char *line, | |
d231781a | 562 | const char *filename, int linenum, int *activep, const char *user, |
563 | const char *host, const char *address) | |
8efc0c15 | 564 | { |
d11c1288 | 565 | char *cp, **charptr, *arg, *p; |
d231781a | 566 | int cmdline = 0, *intptr, value, n; |
5260325f | 567 | ServerOpCodes opcode; |
3867aa0a | 568 | u_short port; |
d231781a | 569 | u_int i, flags = 0; |
d66ce1a1 | 570 | size_t len; |
5260325f | 571 | |
2717fa0f | 572 | cp = line; |
0f8cd5a6 | 573 | if ((arg = strdelim(&cp)) == NULL) |
88299971 | 574 | return 0; |
2717fa0f | 575 | /* Ignore leading whitespace */ |
576 | if (*arg == '\0') | |
704b1659 | 577 | arg = strdelim(&cp); |
2717fa0f | 578 | if (!arg || !*arg || *arg == '#') |
579 | return 0; | |
580 | intptr = NULL; | |
581 | charptr = NULL; | |
d231781a | 582 | opcode = parse_token(arg, filename, linenum, &flags); |
583 | ||
584 | if (activep == NULL) { /* We are processing a command line directive */ | |
585 | cmdline = 1; | |
586 | activep = &cmdline; | |
587 | } | |
588 | if (*activep && opcode != sMatch) | |
589 | debug3("%s:%d setting %s %s", filename, linenum, arg, cp); | |
590 | if (*activep == 0 && !(flags & SSHCFG_MATCH)) { | |
591 | if (user == NULL) { | |
592 | fatal("%s line %d: Directive '%s' is not allowed " | |
593 | "within a Match block", filename, linenum, arg); | |
594 | } else { /* this is a directive we have already processed */ | |
595 | while (arg) | |
596 | arg = strdelim(&cp); | |
597 | return 0; | |
598 | } | |
599 | } | |
600 | ||
2717fa0f | 601 | switch (opcode) { |
602 | /* Portable-specific options */ | |
7fceb20d | 603 | case sUsePAM: |
604 | intptr = &options->use_pam; | |
2717fa0f | 605 | goto parse_flag; |
48e671d5 | 606 | |
2717fa0f | 607 | /* Standard Options */ |
608 | case sBadOption: | |
609 | return -1; | |
610 | case sPort: | |
611 | /* ignore ports from configfile if cmdline specifies ports */ | |
612 | if (options->ports_from_cmdline) | |
613 | return 0; | |
614 | if (options->listen_addrs != NULL) | |
615 | fatal("%s line %d: ports must be specified before " | |
3a454b6a | 616 | "ListenAddress.", filename, linenum); |
2717fa0f | 617 | if (options->num_ports >= MAX_PORTS) |
618 | fatal("%s line %d: too many ports.", | |
619 | filename, linenum); | |
620 | arg = strdelim(&cp); | |
621 | if (!arg || *arg == '\0') | |
622 | fatal("%s line %d: missing port number.", | |
623 | filename, linenum); | |
624 | options->ports[options->num_ports++] = a2port(arg); | |
625 | if (options->ports[options->num_ports-1] == 0) | |
626 | fatal("%s line %d: Badly formatted port number.", | |
627 | filename, linenum); | |
628 | break; | |
629 | ||
630 | case sServerKeyBits: | |
631 | intptr = &options->server_key_bits; | |
5260325f | 632 | parse_int: |
2717fa0f | 633 | arg = strdelim(&cp); |
634 | if (!arg || *arg == '\0') | |
635 | fatal("%s line %d: missing integer value.", | |
636 | filename, linenum); | |
637 | value = atoi(arg); | |
d231781a | 638 | if (*activep && *intptr == -1) |
2717fa0f | 639 | *intptr = value; |
640 | break; | |
641 | ||
642 | case sLoginGraceTime: | |
643 | intptr = &options->login_grace_time; | |
e2b1fb42 | 644 | parse_time: |
2717fa0f | 645 | arg = strdelim(&cp); |
646 | if (!arg || *arg == '\0') | |
647 | fatal("%s line %d: missing time value.", | |
648 | filename, linenum); | |
649 | if ((value = convtime(arg)) == -1) | |
650 | fatal("%s line %d: invalid time value.", | |
651 | filename, linenum); | |
652 | if (*intptr == -1) | |
653 | *intptr = value; | |
654 | break; | |
655 | ||
656 | case sKeyRegenerationTime: | |
657 | intptr = &options->key_regeneration_time; | |
658 | goto parse_time; | |
659 | ||
660 | case sListenAddress: | |
661 | arg = strdelim(&cp); | |
3867aa0a | 662 | if (arg == NULL || *arg == '\0') |
663 | fatal("%s line %d: missing address", | |
2717fa0f | 664 | filename, linenum); |
91135a0e | 665 | /* check for bare IPv6 address: no "[]" and 2 or more ":" */ |
666 | if (strchr(arg, '[') == NULL && (p = strchr(arg, ':')) != NULL | |
667 | && strchr(p+1, ':') != NULL) { | |
668 | add_listen_addr(options, arg, 0); | |
669 | break; | |
670 | } | |
3867aa0a | 671 | p = hpdelim(&arg); |
672 | if (p == NULL) | |
673 | fatal("%s line %d: bad address:port usage", | |
2717fa0f | 674 | filename, linenum); |
3867aa0a | 675 | p = cleanhostname(p); |
676 | if (arg == NULL) | |
677 | port = 0; | |
678 | else if ((port = a2port(arg)) == 0) | |
679 | fatal("%s line %d: bad port number", filename, linenum); | |
680 | ||
681 | add_listen_addr(options, p, port); | |
682 | ||
2717fa0f | 683 | break; |
684 | ||
31b41ceb | 685 | case sAddressFamily: |
686 | arg = strdelim(&cp); | |
38634ff6 | 687 | if (!arg || *arg == '\0') |
688 | fatal("%s line %d: missing address family.", | |
689 | filename, linenum); | |
31b41ceb | 690 | intptr = &options->address_family; |
691 | if (options->listen_addrs != NULL) | |
692 | fatal("%s line %d: address family must be specified before " | |
693 | "ListenAddress.", filename, linenum); | |
694 | if (strcasecmp(arg, "inet") == 0) | |
695 | value = AF_INET; | |
696 | else if (strcasecmp(arg, "inet6") == 0) | |
697 | value = AF_INET6; | |
698 | else if (strcasecmp(arg, "any") == 0) | |
699 | value = AF_UNSPEC; | |
700 | else | |
701 | fatal("%s line %d: unsupported address family \"%s\".", | |
702 | filename, linenum, arg); | |
703 | if (*intptr == -1) | |
704 | *intptr = value; | |
705 | break; | |
706 | ||
2717fa0f | 707 | case sHostKeyFile: |
708 | intptr = &options->num_host_key_files; | |
709 | if (*intptr >= MAX_HOSTKEYS) | |
710 | fatal("%s line %d: too many host keys specified (max %d).", | |
711 | filename, linenum, MAX_HOSTKEYS); | |
712 | charptr = &options->host_key_files[*intptr]; | |
fa649821 | 713 | parse_filename: |
2717fa0f | 714 | arg = strdelim(&cp); |
715 | if (!arg || *arg == '\0') | |
716 | fatal("%s line %d: missing file name.", | |
717 | filename, linenum); | |
d231781a | 718 | if (*activep && *charptr == NULL) { |
2717fa0f | 719 | *charptr = tilde_expand_filename(arg, getuid()); |
720 | /* increase optional counter */ | |
721 | if (intptr != NULL) | |
722 | *intptr = *intptr + 1; | |
723 | } | |
724 | break; | |
0fbe8c74 | 725 | |
2717fa0f | 726 | case sPidFile: |
727 | charptr = &options->pid_file; | |
728 | goto parse_filename; | |
5260325f | 729 | |
2717fa0f | 730 | case sPermitRootLogin: |
731 | intptr = &options->permit_root_login; | |
732 | arg = strdelim(&cp); | |
733 | if (!arg || *arg == '\0') | |
734 | fatal("%s line %d: missing yes/" | |
735 | "without-password/forced-commands-only/no " | |
736 | "argument.", filename, linenum); | |
737 | value = 0; /* silence compiler */ | |
738 | if (strcmp(arg, "without-password") == 0) | |
739 | value = PERMIT_NO_PASSWD; | |
740 | else if (strcmp(arg, "forced-commands-only") == 0) | |
741 | value = PERMIT_FORCED_ONLY; | |
742 | else if (strcmp(arg, "yes") == 0) | |
743 | value = PERMIT_YES; | |
744 | else if (strcmp(arg, "no") == 0) | |
745 | value = PERMIT_NO; | |
746 | else | |
747 | fatal("%s line %d: Bad yes/" | |
748 | "without-password/forced-commands-only/no " | |
749 | "argument: %s", filename, linenum, arg); | |
750 | if (*intptr == -1) | |
751 | *intptr = value; | |
752 | break; | |
753 | ||
754 | case sIgnoreRhosts: | |
755 | intptr = &options->ignore_rhosts; | |
5260325f | 756 | parse_flag: |
2717fa0f | 757 | arg = strdelim(&cp); |
758 | if (!arg || *arg == '\0') | |
759 | fatal("%s line %d: missing yes/no argument.", | |
760 | filename, linenum); | |
761 | value = 0; /* silence compiler */ | |
762 | if (strcmp(arg, "yes") == 0) | |
763 | value = 1; | |
764 | else if (strcmp(arg, "no") == 0) | |
765 | value = 0; | |
766 | else | |
767 | fatal("%s line %d: Bad yes/no argument: %s", | |
768 | filename, linenum, arg); | |
d231781a | 769 | if (*activep && *intptr == -1) |
2717fa0f | 770 | *intptr = value; |
771 | break; | |
772 | ||
773 | case sIgnoreUserKnownHosts: | |
774 | intptr = &options->ignore_user_known_hosts; | |
775 | goto parse_flag; | |
776 | ||
2717fa0f | 777 | case sRhostsRSAAuthentication: |
778 | intptr = &options->rhosts_rsa_authentication; | |
779 | goto parse_flag; | |
780 | ||
781 | case sHostbasedAuthentication: | |
782 | intptr = &options->hostbased_authentication; | |
783 | goto parse_flag; | |
784 | ||
785 | case sHostbasedUsesNameFromPacketOnly: | |
786 | intptr = &options->hostbased_uses_name_from_packet_only; | |
787 | goto parse_flag; | |
788 | ||
789 | case sRSAAuthentication: | |
790 | intptr = &options->rsa_authentication; | |
791 | goto parse_flag; | |
792 | ||
793 | case sPubkeyAuthentication: | |
794 | intptr = &options->pubkey_authentication; | |
795 | goto parse_flag; | |
d0ec7f42 | 796 | |
2717fa0f | 797 | case sKerberosAuthentication: |
798 | intptr = &options->kerberos_authentication; | |
799 | goto parse_flag; | |
5260325f | 800 | |
2717fa0f | 801 | case sKerberosOrLocalPasswd: |
802 | intptr = &options->kerberos_or_local_passwd; | |
803 | goto parse_flag; | |
5260325f | 804 | |
2717fa0f | 805 | case sKerberosTicketCleanup: |
806 | intptr = &options->kerberos_ticket_cleanup; | |
807 | goto parse_flag; | |
d0ec7f42 | 808 | |
a1e30b47 | 809 | case sKerberosGetAFSToken: |
810 | intptr = &options->kerberos_get_afs_token; | |
811 | goto parse_flag; | |
812 | ||
7364bd04 | 813 | case sGssAuthentication: |
814 | intptr = &options->gss_authentication; | |
815 | goto parse_flag; | |
816 | ||
817 | case sGssCleanupCreds: | |
818 | intptr = &options->gss_cleanup_creds; | |
819 | goto parse_flag; | |
820 | ||
2717fa0f | 821 | case sPasswordAuthentication: |
822 | intptr = &options->password_authentication; | |
823 | goto parse_flag; | |
5260325f | 824 | |
2717fa0f | 825 | case sKbdInteractiveAuthentication: |
826 | intptr = &options->kbd_interactive_authentication; | |
827 | goto parse_flag; | |
8002af61 | 828 | |
2717fa0f | 829 | case sChallengeResponseAuthentication: |
830 | intptr = &options->challenge_response_authentication; | |
831 | goto parse_flag; | |
8002af61 | 832 | |
2717fa0f | 833 | case sPrintMotd: |
834 | intptr = &options->print_motd; | |
835 | goto parse_flag; | |
5260325f | 836 | |
2717fa0f | 837 | case sPrintLastLog: |
838 | intptr = &options->print_lastlog; | |
839 | goto parse_flag; | |
5260325f | 840 | |
2717fa0f | 841 | case sX11Forwarding: |
842 | intptr = &options->x11_forwarding; | |
843 | goto parse_flag; | |
5260325f | 844 | |
2717fa0f | 845 | case sX11DisplayOffset: |
846 | intptr = &options->x11_display_offset; | |
847 | goto parse_int; | |
8efc0c15 | 848 | |
e6e573bd | 849 | case sX11UseLocalhost: |
850 | intptr = &options->x11_use_localhost; | |
851 | goto parse_flag; | |
852 | ||
2717fa0f | 853 | case sXAuthLocation: |
854 | charptr = &options->xauth_location; | |
855 | goto parse_filename; | |
5260325f | 856 | |
2717fa0f | 857 | case sStrictModes: |
858 | intptr = &options->strict_modes; | |
859 | goto parse_flag; | |
5260325f | 860 | |
fd573618 | 861 | case sTCPKeepAlive: |
862 | intptr = &options->tcp_keep_alive; | |
2717fa0f | 863 | goto parse_flag; |
33de75a3 | 864 | |
2717fa0f | 865 | case sEmptyPasswd: |
866 | intptr = &options->permit_empty_passwd; | |
867 | goto parse_flag; | |
5260325f | 868 | |
f00bab84 | 869 | case sPermitUserEnvironment: |
870 | intptr = &options->permit_user_env; | |
871 | goto parse_flag; | |
872 | ||
2717fa0f | 873 | case sUseLogin: |
874 | intptr = &options->use_login; | |
875 | goto parse_flag; | |
5260325f | 876 | |
636f76ca | 877 | case sCompression: |
878 | intptr = &options->compression; | |
07200973 | 879 | arg = strdelim(&cp); |
880 | if (!arg || *arg == '\0') | |
881 | fatal("%s line %d: missing yes/no/delayed " | |
882 | "argument.", filename, linenum); | |
883 | value = 0; /* silence compiler */ | |
884 | if (strcmp(arg, "delayed") == 0) | |
885 | value = COMP_DELAYED; | |
886 | else if (strcmp(arg, "yes") == 0) | |
887 | value = COMP_ZLIB; | |
888 | else if (strcmp(arg, "no") == 0) | |
889 | value = COMP_NONE; | |
890 | else | |
891 | fatal("%s line %d: Bad yes/no/delayed " | |
892 | "argument: %s", filename, linenum, arg); | |
893 | if (*intptr == -1) | |
894 | *intptr = value; | |
895 | break; | |
636f76ca | 896 | |
2717fa0f | 897 | case sGatewayPorts: |
898 | intptr = &options->gateway_ports; | |
3867aa0a | 899 | arg = strdelim(&cp); |
900 | if (!arg || *arg == '\0') | |
901 | fatal("%s line %d: missing yes/no/clientspecified " | |
902 | "argument.", filename, linenum); | |
903 | value = 0; /* silence compiler */ | |
904 | if (strcmp(arg, "clientspecified") == 0) | |
905 | value = 2; | |
906 | else if (strcmp(arg, "yes") == 0) | |
907 | value = 1; | |
908 | else if (strcmp(arg, "no") == 0) | |
909 | value = 0; | |
910 | else | |
911 | fatal("%s line %d: Bad yes/no/clientspecified " | |
912 | "argument: %s", filename, linenum, arg); | |
913 | if (*intptr == -1) | |
914 | *intptr = value; | |
915 | break; | |
5260325f | 916 | |
c5a7d788 | 917 | case sUseDNS: |
918 | intptr = &options->use_dns; | |
2717fa0f | 919 | goto parse_flag; |
5260325f | 920 | |
2717fa0f | 921 | case sLogFacility: |
922 | intptr = (int *) &options->log_facility; | |
923 | arg = strdelim(&cp); | |
924 | value = log_facility_number(arg); | |
5eaf8578 | 925 | if (value == SYSLOG_FACILITY_NOT_SET) |
2717fa0f | 926 | fatal("%.200s line %d: unsupported log facility '%s'", |
927 | filename, linenum, arg ? arg : "<NONE>"); | |
928 | if (*intptr == -1) | |
929 | *intptr = (SyslogFacility) value; | |
930 | break; | |
931 | ||
932 | case sLogLevel: | |
933 | intptr = (int *) &options->log_level; | |
934 | arg = strdelim(&cp); | |
935 | value = log_level_number(arg); | |
5eaf8578 | 936 | if (value == SYSLOG_LEVEL_NOT_SET) |
2717fa0f | 937 | fatal("%.200s line %d: unsupported log level '%s'", |
938 | filename, linenum, arg ? arg : "<NONE>"); | |
939 | if (*intptr == -1) | |
940 | *intptr = (LogLevel) value; | |
941 | break; | |
942 | ||
943 | case sAllowTcpForwarding: | |
944 | intptr = &options->allow_tcp_forwarding; | |
945 | goto parse_flag; | |
946 | ||
1853d1ef | 947 | case sUsePrivilegeSeparation: |
948 | intptr = &use_privsep; | |
949 | goto parse_flag; | |
950 | ||
2717fa0f | 951 | case sAllowUsers: |
952 | while ((arg = strdelim(&cp)) && *arg != '\0') { | |
953 | if (options->num_allow_users >= MAX_ALLOW_USERS) | |
954 | fatal("%s line %d: too many allow users.", | |
955 | filename, linenum); | |
7528d467 | 956 | options->allow_users[options->num_allow_users++] = |
957 | xstrdup(arg); | |
2717fa0f | 958 | } |
959 | break; | |
a8be9f80 | 960 | |
2717fa0f | 961 | case sDenyUsers: |
962 | while ((arg = strdelim(&cp)) && *arg != '\0') { | |
963 | if (options->num_deny_users >= MAX_DENY_USERS) | |
d4f40d92 | 964 | fatal("%s line %d: too many deny users.", |
2717fa0f | 965 | filename, linenum); |
7528d467 | 966 | options->deny_users[options->num_deny_users++] = |
967 | xstrdup(arg); | |
2717fa0f | 968 | } |
969 | break; | |
b2552997 | 970 | |
2717fa0f | 971 | case sAllowGroups: |
972 | while ((arg = strdelim(&cp)) && *arg != '\0') { | |
973 | if (options->num_allow_groups >= MAX_ALLOW_GROUPS) | |
974 | fatal("%s line %d: too many allow groups.", | |
975 | filename, linenum); | |
7528d467 | 976 | options->allow_groups[options->num_allow_groups++] = |
977 | xstrdup(arg); | |
2717fa0f | 978 | } |
979 | break; | |
a8be9f80 | 980 | |
2717fa0f | 981 | case sDenyGroups: |
982 | while ((arg = strdelim(&cp)) && *arg != '\0') { | |
983 | if (options->num_deny_groups >= MAX_DENY_GROUPS) | |
984 | fatal("%s line %d: too many deny groups.", | |
985 | filename, linenum); | |
986 | options->deny_groups[options->num_deny_groups++] = xstrdup(arg); | |
987 | } | |
988 | break; | |
38c295d6 | 989 | |
2717fa0f | 990 | case sCiphers: |
991 | arg = strdelim(&cp); | |
992 | if (!arg || *arg == '\0') | |
993 | fatal("%s line %d: Missing argument.", filename, linenum); | |
994 | if (!ciphers_valid(arg)) | |
995 | fatal("%s line %d: Bad SSH2 cipher spec '%s'.", | |
996 | filename, linenum, arg ? arg : "<NONE>"); | |
997 | if (options->ciphers == NULL) | |
998 | options->ciphers = xstrdup(arg); | |
999 | break; | |
1000 | ||
1001 | case sMacs: | |
1002 | arg = strdelim(&cp); | |
1003 | if (!arg || *arg == '\0') | |
1004 | fatal("%s line %d: Missing argument.", filename, linenum); | |
1005 | if (!mac_valid(arg)) | |
1006 | fatal("%s line %d: Bad SSH2 mac spec '%s'.", | |
1007 | filename, linenum, arg ? arg : "<NONE>"); | |
1008 | if (options->macs == NULL) | |
1009 | options->macs = xstrdup(arg); | |
1010 | break; | |
1011 | ||
1012 | case sProtocol: | |
1013 | intptr = &options->protocol; | |
1014 | arg = strdelim(&cp); | |
1015 | if (!arg || *arg == '\0') | |
1016 | fatal("%s line %d: Missing argument.", filename, linenum); | |
1017 | value = proto_spec(arg); | |
1018 | if (value == SSH_PROTO_UNKNOWN) | |
1019 | fatal("%s line %d: Bad protocol spec '%s'.", | |
184eed6a | 1020 | filename, linenum, arg ? arg : "<NONE>"); |
2717fa0f | 1021 | if (*intptr == SSH_PROTO_UNKNOWN) |
1022 | *intptr = value; | |
1023 | break; | |
1024 | ||
1025 | case sSubsystem: | |
1026 | if (options->num_subsystems >= MAX_SUBSYSTEMS) { | |
1027 | fatal("%s line %d: too many subsystems defined.", | |
184eed6a | 1028 | filename, linenum); |
2717fa0f | 1029 | } |
1030 | arg = strdelim(&cp); | |
1031 | if (!arg || *arg == '\0') | |
1032 | fatal("%s line %d: Missing subsystem name.", | |
184eed6a | 1033 | filename, linenum); |
d231781a | 1034 | if (!*activep) { |
1035 | arg = strdelim(&cp); | |
1036 | break; | |
1037 | } | |
2717fa0f | 1038 | for (i = 0; i < options->num_subsystems; i++) |
1039 | if (strcmp(arg, options->subsystem_name[i]) == 0) | |
1040 | fatal("%s line %d: Subsystem '%s' already defined.", | |
184eed6a | 1041 | filename, linenum, arg); |
2717fa0f | 1042 | options->subsystem_name[options->num_subsystems] = xstrdup(arg); |
1043 | arg = strdelim(&cp); | |
1044 | if (!arg || *arg == '\0') | |
1045 | fatal("%s line %d: Missing subsystem command.", | |
184eed6a | 1046 | filename, linenum); |
2717fa0f | 1047 | options->subsystem_command[options->num_subsystems] = xstrdup(arg); |
d66ce1a1 | 1048 | |
1049 | /* Collect arguments (separate to executable) */ | |
1050 | p = xstrdup(arg); | |
1051 | len = strlen(p) + 1; | |
1052 | while ((arg = strdelim(&cp)) != NULL && *arg != '\0') { | |
1053 | len += 1 + strlen(arg); | |
1054 | p = xrealloc(p, 1, len); | |
1055 | strlcat(p, " ", len); | |
1056 | strlcat(p, arg, len); | |
1057 | } | |
1058 | options->subsystem_args[options->num_subsystems] = p; | |
2717fa0f | 1059 | options->num_subsystems++; |
1060 | break; | |
1061 | ||
1062 | case sMaxStartups: | |
1063 | arg = strdelim(&cp); | |
1064 | if (!arg || *arg == '\0') | |
1065 | fatal("%s line %d: Missing MaxStartups spec.", | |
184eed6a | 1066 | filename, linenum); |
2717fa0f | 1067 | if ((n = sscanf(arg, "%d:%d:%d", |
1068 | &options->max_startups_begin, | |
1069 | &options->max_startups_rate, | |
1070 | &options->max_startups)) == 3) { | |
1071 | if (options->max_startups_begin > | |
1072 | options->max_startups || | |
1073 | options->max_startups_rate > 100 || | |
1074 | options->max_startups_rate < 1) | |
c345cf9d | 1075 | fatal("%s line %d: Illegal MaxStartups spec.", |
97de229c | 1076 | filename, linenum); |
2717fa0f | 1077 | } else if (n != 1) |
1078 | fatal("%s line %d: Illegal MaxStartups spec.", | |
1079 | filename, linenum); | |
1080 | else | |
1081 | options->max_startups = options->max_startups_begin; | |
1082 | break; | |
1083 | ||
af4bd935 | 1084 | case sMaxAuthTries: |
1085 | intptr = &options->max_authtries; | |
1086 | goto parse_int; | |
1087 | ||
2717fa0f | 1088 | case sBanner: |
1089 | charptr = &options->banner; | |
1090 | goto parse_filename; | |
1091 | /* | |
1092 | * These options can contain %X options expanded at | |
1093 | * connect time, so that you can specify paths like: | |
1094 | * | |
1095 | * AuthorizedKeysFile /etc/ssh_keys/%u | |
1096 | */ | |
1097 | case sAuthorizedKeysFile: | |
1098 | case sAuthorizedKeysFile2: | |
d4f40d92 | 1099 | charptr = (opcode == sAuthorizedKeysFile) ? |
2717fa0f | 1100 | &options->authorized_keys_file : |
1101 | &options->authorized_keys_file2; | |
1102 | goto parse_filename; | |
1103 | ||
1104 | case sClientAliveInterval: | |
1105 | intptr = &options->client_alive_interval; | |
1106 | goto parse_time; | |
1107 | ||
1108 | case sClientAliveCountMax: | |
1109 | intptr = &options->client_alive_count_max; | |
1110 | goto parse_int; | |
1111 | ||
61a2c1da | 1112 | case sAcceptEnv: |
1113 | while ((arg = strdelim(&cp)) && *arg != '\0') { | |
1114 | if (strchr(arg, '=') != NULL) | |
1115 | fatal("%s line %d: Invalid environment name.", | |
1116 | filename, linenum); | |
1117 | if (options->num_accept_env >= MAX_ACCEPT_ENV) | |
1118 | fatal("%s line %d: too many allow env.", | |
1119 | filename, linenum); | |
d231781a | 1120 | if (!*activep) |
1121 | break; | |
61a2c1da | 1122 | options->accept_env[options->num_accept_env++] = |
1123 | xstrdup(arg); | |
1124 | } | |
1125 | break; | |
1126 | ||
d20f3c9e | 1127 | case sPermitTunnel: |
1128 | intptr = &options->permit_tun; | |
a4f24bf8 | 1129 | arg = strdelim(&cp); |
1130 | if (!arg || *arg == '\0') | |
1131 | fatal("%s line %d: Missing yes/point-to-point/" | |
1132 | "ethernet/no argument.", filename, linenum); | |
1133 | value = 0; /* silence compiler */ | |
1134 | if (strcasecmp(arg, "ethernet") == 0) | |
1135 | value = SSH_TUNMODE_ETHERNET; | |
1136 | else if (strcasecmp(arg, "point-to-point") == 0) | |
1137 | value = SSH_TUNMODE_POINTOPOINT; | |
1138 | else if (strcasecmp(arg, "yes") == 0) | |
1139 | value = SSH_TUNMODE_YES; | |
1140 | else if (strcasecmp(arg, "no") == 0) | |
1141 | value = SSH_TUNMODE_NO; | |
1142 | else | |
1143 | fatal("%s line %d: Bad yes/point-to-point/ethernet/" | |
1144 | "no argument: %s", filename, linenum, arg); | |
1145 | if (*intptr == -1) | |
1146 | *intptr = value; | |
1147 | break; | |
d20f3c9e | 1148 | |
d231781a | 1149 | case sMatch: |
1150 | if (cmdline) | |
1151 | fatal("Match directive not supported as a command-line " | |
1152 | "option"); | |
1153 | value = match_cfg_line(&cp, linenum, user, host, address); | |
1154 | if (value < 0) | |
1155 | fatal("%s line %d: Bad Match condition", filename, | |
1156 | linenum); | |
1157 | *activep = value; | |
1158 | break; | |
1159 | ||
2fefbadf | 1160 | case sPermitOpen: |
1161 | arg = strdelim(&cp); | |
1162 | if (!arg || *arg == '\0') | |
1163 | fatal("%s line %d: missing PermitOpen specification", | |
1164 | filename, linenum); | |
1165 | if (strcmp(arg, "any") == 0) { | |
ea46e550 | 1166 | if (*activep) { |
2fefbadf | 1167 | channel_clear_adm_permitted_opens(); |
ea46e550 | 1168 | options->num_permitted_opens = 0; |
1169 | } | |
2fefbadf | 1170 | break; |
1171 | } | |
ea46e550 | 1172 | for (; arg != NULL && *arg != '\0'; arg = strdelim(&cp)) { |
1173 | p = hpdelim(&arg); | |
1174 | if (p == NULL) | |
1175 | fatal("%s line %d: missing host in PermitOpen", | |
1176 | filename, linenum); | |
1177 | p = cleanhostname(p); | |
1178 | if (arg == NULL || (port = a2port(arg)) == 0) | |
1179 | fatal("%s line %d: bad port number in " | |
1180 | "PermitOpen", filename, linenum); | |
1181 | if (*activep && options->num_permitted_opens == -1) { | |
1182 | channel_clear_adm_permitted_opens(); | |
1183 | options->num_permitted_opens = | |
1184 | channel_add_adm_permitted_opens(p, port); | |
1185 | } | |
1186 | } | |
2fefbadf | 1187 | break; |
1188 | ||
e7259e8d | 1189 | case sForceCommand: |
1190 | if (cp == NULL) | |
1191 | fatal("%.200s line %d: Missing argument.", filename, | |
1192 | linenum); | |
1193 | len = strspn(cp, WHITESPACE); | |
1194 | if (*activep && options->adm_forced_command == NULL) | |
1195 | options->adm_forced_command = xstrdup(cp + len); | |
1196 | return 0; | |
1197 | ||
2717fa0f | 1198 | case sDeprecated: |
bbe88b6d | 1199 | logit("%s line %d: Deprecated option %s", |
2717fa0f | 1200 | filename, linenum, arg); |
1201 | while (arg) | |
1202 | arg = strdelim(&cp); | |
1203 | break; | |
1204 | ||
a2144546 | 1205 | case sUnsupported: |
1206 | logit("%s line %d: Unsupported option %s", | |
1207 | filename, linenum, arg); | |
1208 | while (arg) | |
1209 | arg = strdelim(&cp); | |
1210 | break; | |
1211 | ||
2717fa0f | 1212 | default: |
1213 | fatal("%s line %d: Missing handler for opcode %s (%d)", | |
1214 | filename, linenum, arg, opcode); | |
1215 | } | |
1216 | if ((arg = strdelim(&cp)) != NULL && *arg != '\0') | |
1217 | fatal("%s line %d: garbage at end of line; \"%.200s\".", | |
1218 | filename, linenum, arg); | |
1219 | return 0; | |
1220 | } | |
089fbbd2 | 1221 | |
2717fa0f | 1222 | /* Reads the server configuration file. */ |
5c53a31e | 1223 | |
2717fa0f | 1224 | void |
b9a549d7 | 1225 | load_server_config(const char *filename, Buffer *conf) |
2717fa0f | 1226 | { |
b9a549d7 | 1227 | char line[1024], *cp; |
7528d467 | 1228 | FILE *f; |
2717fa0f | 1229 | |
b9a549d7 | 1230 | debug2("%s: filename %s", __func__, filename); |
1231 | if ((f = fopen(filename, "r")) == NULL) { | |
2717fa0f | 1232 | perror(filename); |
1233 | exit(1); | |
1234 | } | |
b9a549d7 | 1235 | buffer_clear(conf); |
2717fa0f | 1236 | while (fgets(line, sizeof(line), f)) { |
b9a549d7 | 1237 | /* |
1238 | * Trim out comments and strip whitespace | |
f2107e97 | 1239 | * NB - preserve newlines, they are needed to reproduce |
b9a549d7 | 1240 | * line numbers later for error messages |
1241 | */ | |
1242 | if ((cp = strchr(line, '#')) != NULL) | |
1243 | memcpy(cp, "\n", 2); | |
1244 | cp = line + strspn(line, " \t\r"); | |
1245 | ||
1246 | buffer_append(conf, cp, strlen(cp)); | |
8efc0c15 | 1247 | } |
b9a549d7 | 1248 | buffer_append(conf, "\0", 1); |
5260325f | 1249 | fclose(f); |
b9a549d7 | 1250 | debug2("%s: done config len = %d", __func__, buffer_len(conf)); |
1251 | } | |
1252 | ||
1253 | void | |
d231781a | 1254 | parse_server_match_config(ServerOptions *options, const char *user, |
1255 | const char *host, const char *address) | |
1256 | { | |
1257 | ServerOptions mo; | |
1258 | ||
1259 | initialize_server_options(&mo); | |
1260 | parse_server_config(&mo, "reprocess config", &cfg, user, host, address); | |
1261 | copy_set_server_options(options, &mo); | |
1262 | } | |
1263 | ||
1264 | /* Copy any (supported) values that are set */ | |
1265 | void | |
1266 | copy_set_server_options(ServerOptions *dst, ServerOptions *src) | |
1267 | { | |
1268 | if (src->allow_tcp_forwarding != -1) | |
1269 | dst->allow_tcp_forwarding = src->allow_tcp_forwarding; | |
1270 | if (src->gateway_ports != -1) | |
1271 | dst->gateway_ports = src->gateway_ports; | |
e7259e8d | 1272 | if (src->adm_forced_command != NULL) { |
1273 | if (dst->adm_forced_command != NULL) | |
1274 | xfree(dst->adm_forced_command); | |
1275 | dst->adm_forced_command = src->adm_forced_command; | |
1276 | } | |
691712e0 | 1277 | if (src->x11_display_offset != -1) |
1278 | dst->x11_display_offset = src->x11_display_offset; | |
1279 | if (src->x11_forwarding != -1) | |
1280 | dst->x11_forwarding = src->x11_forwarding; | |
1281 | if (src->x11_use_localhost != -1) | |
1282 | dst->x11_use_localhost = src->x11_use_localhost; | |
d231781a | 1283 | } |
1284 | ||
1285 | void | |
1286 | parse_server_config(ServerOptions *options, const char *filename, Buffer *conf, | |
1287 | const char *user, const char *host, const char *address) | |
b9a549d7 | 1288 | { |
d231781a | 1289 | int active, linenum, bad_options = 0; |
16acb158 | 1290 | char *cp, *obuf, *cbuf; |
b9a549d7 | 1291 | |
1292 | debug2("%s: config %s len %d", __func__, filename, buffer_len(conf)); | |
1293 | ||
16acb158 | 1294 | obuf = cbuf = xstrdup(buffer_ptr(conf)); |
d231781a | 1295 | active = user ? 0 : 1; |
861cc543 | 1296 | linenum = 1; |
f8cc7664 | 1297 | while ((cp = strsep(&cbuf, "\n")) != NULL) { |
b9a549d7 | 1298 | if (process_server_config_line(options, cp, filename, |
d231781a | 1299 | linenum++, &active, user, host, address) != 0) |
b9a549d7 | 1300 | bad_options++; |
1301 | } | |
16acb158 | 1302 | xfree(obuf); |
b7c70970 | 1303 | if (bad_options > 0) |
1304 | fatal("%s: terminating, %d bad configuration options", | |
1305 | filename, bad_options); | |
8efc0c15 | 1306 | } |