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c8dfff33 | 1 | /* $OpenBSD: servconf.c,v 1.154 2006/07/12 22:28:52 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 | ||
c8dfff33 | 18 | #if defined(HAVE_NETDB_H) |
19 | # include <netdb.h> | |
20 | #endif | |
21 | ||
8efc0c15 | 22 | #include "ssh.h" |
42f11eb2 | 23 | #include "log.h" |
8efc0c15 | 24 | #include "servconf.h" |
25 | #include "xmalloc.h" | |
a8be9f80 | 26 | #include "compat.h" |
42f11eb2 | 27 | #include "pathnames.h" |
42f11eb2 | 28 | #include "misc.h" |
29 | #include "cipher.h" | |
b2552997 | 30 | #include "kex.h" |
31 | #include "mac.h" | |
d231781a | 32 | #include "match.h" |
42f11eb2 | 33 | |
396c147e | 34 | static void add_listen_addr(ServerOptions *, char *, u_short); |
35 | static void add_one_listen_addr(ServerOptions *, char *, u_short); | |
48e671d5 | 36 | |
1853d1ef | 37 | /* Use of privilege separation or not */ |
38 | extern int use_privsep; | |
d231781a | 39 | extern Buffer cfg; |
42f11eb2 | 40 | |
8efc0c15 | 41 | /* Initializes the server options to their default values. */ |
42 | ||
6ae2364d | 43 | void |
5260325f | 44 | initialize_server_options(ServerOptions *options) |
8efc0c15 | 45 | { |
5260325f | 46 | memset(options, 0, sizeof(*options)); |
e15895cd | 47 | |
48 | /* Portable-specific options */ | |
7fceb20d | 49 | options->use_pam = -1; |
e15895cd | 50 | |
51 | /* Standard Options */ | |
48e671d5 | 52 | options->num_ports = 0; |
53 | options->ports_from_cmdline = 0; | |
54 | options->listen_addrs = NULL; | |
31b41ceb | 55 | options->address_family = -1; |
fa08c86b | 56 | options->num_host_key_files = 0; |
0fbe8c74 | 57 | options->pid_file = NULL; |
5260325f | 58 | options->server_key_bits = -1; |
59 | options->login_grace_time = -1; | |
60 | options->key_regeneration_time = -1; | |
15853e93 | 61 | options->permit_root_login = PERMIT_NOT_SET; |
5260325f | 62 | options->ignore_rhosts = -1; |
63 | options->ignore_user_known_hosts = -1; | |
64 | options->print_motd = -1; | |
4f4648f9 | 65 | options->print_lastlog = -1; |
5260325f | 66 | options->x11_forwarding = -1; |
67 | options->x11_display_offset = -1; | |
e6e573bd | 68 | options->x11_use_localhost = -1; |
fa649821 | 69 | options->xauth_location = NULL; |
5260325f | 70 | options->strict_modes = -1; |
fd573618 | 71 | options->tcp_keep_alive = -1; |
5eaf8578 | 72 | options->log_facility = SYSLOG_FACILITY_NOT_SET; |
73 | options->log_level = SYSLOG_LEVEL_NOT_SET; | |
5260325f | 74 | options->rhosts_rsa_authentication = -1; |
8002af61 | 75 | options->hostbased_authentication = -1; |
76 | options->hostbased_uses_name_from_packet_only = -1; | |
5260325f | 77 | options->rsa_authentication = -1; |
fa08c86b | 78 | options->pubkey_authentication = -1; |
5260325f | 79 | options->kerberos_authentication = -1; |
80 | options->kerberos_or_local_passwd = -1; | |
81 | options->kerberos_ticket_cleanup = -1; | |
a1e30b47 | 82 | options->kerberos_get_afs_token = -1; |
7364bd04 | 83 | options->gss_authentication=-1; |
84 | options->gss_cleanup_creds = -1; | |
5260325f | 85 | options->password_authentication = -1; |
94ec8c6b | 86 | options->kbd_interactive_authentication = -1; |
5ba55ada | 87 | options->challenge_response_authentication = -1; |
5260325f | 88 | options->permit_empty_passwd = -1; |
f00bab84 | 89 | options->permit_user_env = -1; |
5260325f | 90 | options->use_login = -1; |
636f76ca | 91 | options->compression = -1; |
33de75a3 | 92 | options->allow_tcp_forwarding = -1; |
5260325f | 93 | options->num_allow_users = 0; |
94 | options->num_deny_users = 0; | |
95 | options->num_allow_groups = 0; | |
96 | options->num_deny_groups = 0; | |
a8be9f80 | 97 | options->ciphers = NULL; |
b2552997 | 98 | options->macs = NULL; |
a8be9f80 | 99 | options->protocol = SSH_PROTO_UNKNOWN; |
1d1ffb87 | 100 | options->gateway_ports = -1; |
38c295d6 | 101 | options->num_subsystems = 0; |
c345cf9d | 102 | options->max_startups_begin = -1; |
103 | options->max_startups_rate = -1; | |
089fbbd2 | 104 | options->max_startups = -1; |
af4bd935 | 105 | options->max_authtries = -1; |
eea39c02 | 106 | options->banner = NULL; |
c5a7d788 | 107 | options->use_dns = -1; |
3ffc6336 | 108 | options->client_alive_interval = -1; |
109 | options->client_alive_count_max = -1; | |
c8445989 | 110 | options->authorized_keys_file = NULL; |
111 | options->authorized_keys_file2 = NULL; | |
61a2c1da | 112 | options->num_accept_env = 0; |
d20f3c9e | 113 | options->permit_tun = -1; |
8efc0c15 | 114 | } |
115 | ||
6ae2364d | 116 | void |
5260325f | 117 | fill_default_server_options(ServerOptions *options) |
8efc0c15 | 118 | { |
e15895cd | 119 | /* Portable-specific options */ |
7fceb20d | 120 | if (options->use_pam == -1) |
0a23d79f | 121 | options->use_pam = 0; |
e15895cd | 122 | |
123 | /* Standard Options */ | |
fa08c86b | 124 | if (options->protocol == SSH_PROTO_UNKNOWN) |
125 | options->protocol = SSH_PROTO_1|SSH_PROTO_2; | |
126 | if (options->num_host_key_files == 0) { | |
127 | /* fill default hostkeys for protocols */ | |
128 | if (options->protocol & SSH_PROTO_1) | |
0f84fe37 | 129 | options->host_key_files[options->num_host_key_files++] = |
130 | _PATH_HOST_KEY_FILE; | |
131 | if (options->protocol & SSH_PROTO_2) { | |
132 | options->host_key_files[options->num_host_key_files++] = | |
133 | _PATH_HOST_RSA_KEY_FILE; | |
134 | options->host_key_files[options->num_host_key_files++] = | |
135 | _PATH_HOST_DSA_KEY_FILE; | |
136 | } | |
fa08c86b | 137 | } |
48e671d5 | 138 | if (options->num_ports == 0) |
139 | options->ports[options->num_ports++] = SSH_DEFAULT_PORT; | |
140 | if (options->listen_addrs == NULL) | |
2d2a2c65 | 141 | add_listen_addr(options, NULL, 0); |
0fbe8c74 | 142 | if (options->pid_file == NULL) |
42f11eb2 | 143 | options->pid_file = _PATH_SSH_DAEMON_PID_FILE; |
5260325f | 144 | if (options->server_key_bits == -1) |
145 | options->server_key_bits = 768; | |
146 | if (options->login_grace_time == -1) | |
3445ca02 | 147 | options->login_grace_time = 120; |
5260325f | 148 | if (options->key_regeneration_time == -1) |
149 | options->key_regeneration_time = 3600; | |
15853e93 | 150 | if (options->permit_root_login == PERMIT_NOT_SET) |
151 | options->permit_root_login = PERMIT_YES; | |
5260325f | 152 | if (options->ignore_rhosts == -1) |
c8d54615 | 153 | options->ignore_rhosts = 1; |
5260325f | 154 | if (options->ignore_user_known_hosts == -1) |
155 | options->ignore_user_known_hosts = 0; | |
5260325f | 156 | if (options->print_motd == -1) |
157 | options->print_motd = 1; | |
4f4648f9 | 158 | if (options->print_lastlog == -1) |
159 | options->print_lastlog = 1; | |
5260325f | 160 | if (options->x11_forwarding == -1) |
c8d54615 | 161 | options->x11_forwarding = 0; |
5260325f | 162 | if (options->x11_display_offset == -1) |
c8d54615 | 163 | options->x11_display_offset = 10; |
e6e573bd | 164 | if (options->x11_use_localhost == -1) |
165 | options->x11_use_localhost = 1; | |
fa649821 | 166 | if (options->xauth_location == NULL) |
fd9ede94 | 167 | options->xauth_location = _PATH_XAUTH; |
5260325f | 168 | if (options->strict_modes == -1) |
169 | options->strict_modes = 1; | |
fd573618 | 170 | if (options->tcp_keep_alive == -1) |
171 | options->tcp_keep_alive = 1; | |
5eaf8578 | 172 | if (options->log_facility == SYSLOG_FACILITY_NOT_SET) |
5260325f | 173 | options->log_facility = SYSLOG_FACILITY_AUTH; |
5eaf8578 | 174 | if (options->log_level == SYSLOG_LEVEL_NOT_SET) |
59c97189 | 175 | options->log_level = SYSLOG_LEVEL_INFO; |
5260325f | 176 | if (options->rhosts_rsa_authentication == -1) |
c8d54615 | 177 | options->rhosts_rsa_authentication = 0; |
8002af61 | 178 | if (options->hostbased_authentication == -1) |
179 | options->hostbased_authentication = 0; | |
180 | if (options->hostbased_uses_name_from_packet_only == -1) | |
181 | options->hostbased_uses_name_from_packet_only = 0; | |
5260325f | 182 | if (options->rsa_authentication == -1) |
183 | options->rsa_authentication = 1; | |
fa08c86b | 184 | if (options->pubkey_authentication == -1) |
185 | options->pubkey_authentication = 1; | |
5260325f | 186 | if (options->kerberos_authentication == -1) |
eadc806d | 187 | options->kerberos_authentication = 0; |
5260325f | 188 | if (options->kerberos_or_local_passwd == -1) |
189 | options->kerberos_or_local_passwd = 1; | |
190 | if (options->kerberos_ticket_cleanup == -1) | |
191 | options->kerberos_ticket_cleanup = 1; | |
a1e30b47 | 192 | if (options->kerberos_get_afs_token == -1) |
193 | options->kerberos_get_afs_token = 0; | |
7364bd04 | 194 | if (options->gss_authentication == -1) |
195 | options->gss_authentication = 0; | |
196 | if (options->gss_cleanup_creds == -1) | |
197 | options->gss_cleanup_creds = 1; | |
5260325f | 198 | if (options->password_authentication == -1) |
199 | options->password_authentication = 1; | |
94ec8c6b | 200 | if (options->kbd_interactive_authentication == -1) |
201 | options->kbd_interactive_authentication = 0; | |
5ba55ada | 202 | if (options->challenge_response_authentication == -1) |
203 | options->challenge_response_authentication = 1; | |
5260325f | 204 | if (options->permit_empty_passwd == -1) |
c8d54615 | 205 | options->permit_empty_passwd = 0; |
f00bab84 | 206 | if (options->permit_user_env == -1) |
207 | options->permit_user_env = 0; | |
5260325f | 208 | if (options->use_login == -1) |
209 | options->use_login = 0; | |
636f76ca | 210 | if (options->compression == -1) |
07200973 | 211 | options->compression = COMP_DELAYED; |
33de75a3 | 212 | if (options->allow_tcp_forwarding == -1) |
213 | options->allow_tcp_forwarding = 1; | |
1d1ffb87 | 214 | if (options->gateway_ports == -1) |
215 | options->gateway_ports = 0; | |
089fbbd2 | 216 | if (options->max_startups == -1) |
217 | options->max_startups = 10; | |
c345cf9d | 218 | if (options->max_startups_rate == -1) |
219 | options->max_startups_rate = 100; /* 100% */ | |
220 | if (options->max_startups_begin == -1) | |
221 | options->max_startups_begin = options->max_startups; | |
af4bd935 | 222 | if (options->max_authtries == -1) |
223 | options->max_authtries = DEFAULT_AUTH_FAIL_MAX; | |
c5a7d788 | 224 | if (options->use_dns == -1) |
225 | options->use_dns = 1; | |
3ffc6336 | 226 | if (options->client_alive_interval == -1) |
184eed6a | 227 | options->client_alive_interval = 0; |
3ffc6336 | 228 | if (options->client_alive_count_max == -1) |
229 | options->client_alive_count_max = 3; | |
5df83e07 | 230 | if (options->authorized_keys_file2 == NULL) { |
231 | /* authorized_keys_file2 falls back to authorized_keys_file */ | |
232 | if (options->authorized_keys_file != NULL) | |
233 | options->authorized_keys_file2 = options->authorized_keys_file; | |
234 | else | |
235 | options->authorized_keys_file2 = _PATH_SSH_USER_PERMITTED_KEYS2; | |
236 | } | |
237 | if (options->authorized_keys_file == NULL) | |
238 | options->authorized_keys_file = _PATH_SSH_USER_PERMITTED_KEYS; | |
d20f3c9e | 239 | if (options->permit_tun == -1) |
a4f24bf8 | 240 | options->permit_tun = SSH_TUNMODE_NO; |
1853d1ef | 241 | |
2ee1b704 | 242 | /* Turn privilege separation on by default */ |
1853d1ef | 243 | if (use_privsep == -1) |
2ee1b704 | 244 | use_privsep = 1; |
e299a298 | 245 | |
4165b82e | 246 | #ifndef HAVE_MMAP |
e299a298 | 247 | if (use_privsep && options->compression == 1) { |
248 | error("This platform does not support both privilege " | |
249 | "separation and compression"); | |
250 | error("Compression disabled"); | |
251 | options->compression = 0; | |
252 | } | |
253 | #endif | |
254 | ||
8efc0c15 | 255 | } |
256 | ||
8efc0c15 | 257 | /* Keyword tokens. */ |
5260325f | 258 | typedef enum { |
259 | sBadOption, /* == unknown option */ | |
e15895cd | 260 | /* Portable-specific options */ |
7fceb20d | 261 | sUsePAM, |
e15895cd | 262 | /* Standard Options */ |
5260325f | 263 | sPort, sHostKeyFile, sServerKeyBits, sLoginGraceTime, sKeyRegenerationTime, |
264 | sPermitRootLogin, sLogFacility, sLogLevel, | |
0598d99d | 265 | sRhostsRSAAuthentication, sRSAAuthentication, |
5260325f | 266 | sKerberosAuthentication, sKerberosOrLocalPasswd, sKerberosTicketCleanup, |
a1e30b47 | 267 | sKerberosGetAFSToken, |
1c590258 | 268 | sKerberosTgtPassing, sChallengeResponseAuthentication, |
31b41ceb | 269 | sPasswordAuthentication, sKbdInteractiveAuthentication, |
270 | sListenAddress, sAddressFamily, | |
4f4648f9 | 271 | sPrintMotd, sPrintLastLog, sIgnoreRhosts, |
e6e573bd | 272 | sX11Forwarding, sX11DisplayOffset, sX11UseLocalhost, |
fd573618 | 273 | sStrictModes, sEmptyPasswd, sTCPKeepAlive, |
f00bab84 | 274 | sPermitUserEnvironment, sUseLogin, sAllowTcpForwarding, sCompression, |
33de75a3 | 275 | sAllowUsers, sDenyUsers, sAllowGroups, sDenyGroups, |
b2552997 | 276 | sIgnoreUserKnownHosts, sCiphers, sMacs, sProtocol, sPidFile, |
af4bd935 | 277 | sGatewayPorts, sPubkeyAuthentication, sXAuthLocation, sSubsystem, |
278 | sMaxStartups, sMaxAuthTries, | |
c5a7d788 | 279 | sBanner, sUseDNS, sHostbasedAuthentication, |
184eed6a | 280 | sHostbasedUsesNameFromPacketOnly, sClientAliveInterval, |
c8445989 | 281 | sClientAliveCountMax, sAuthorizedKeysFile, sAuthorizedKeysFile2, |
d20f3c9e | 282 | sGssAuthentication, sGssCleanupCreds, sAcceptEnv, sPermitTunnel, |
d231781a | 283 | sMatch, |
2ea6de2b | 284 | sUsePrivilegeSeparation, |
a2144546 | 285 | sDeprecated, sUnsupported |
8efc0c15 | 286 | } ServerOpCodes; |
287 | ||
d231781a | 288 | #define SSHCFG_GLOBAL 0x01 /* allowed in main section of sshd_config */ |
289 | #define SSHCFG_MATCH 0x02 /* allowed inside a Match section */ | |
290 | #define SSHCFG_ALL (SSHCFG_GLOBAL|SSHCFG_MATCH) | |
291 | ||
8efc0c15 | 292 | /* Textual representation of the tokens. */ |
5260325f | 293 | static struct { |
294 | const char *name; | |
295 | ServerOpCodes opcode; | |
d231781a | 296 | u_int flags; |
5260325f | 297 | } keywords[] = { |
e15895cd | 298 | /* Portable-specific options */ |
b06b11ad | 299 | #ifdef USE_PAM |
d231781a | 300 | { "usepam", sUsePAM, SSHCFG_GLOBAL }, |
b06b11ad | 301 | #else |
d231781a | 302 | { "usepam", sUnsupported, SSHCFG_GLOBAL }, |
b06b11ad | 303 | #endif |
d231781a | 304 | { "pamauthenticationviakbdint", sDeprecated, SSHCFG_GLOBAL }, |
e15895cd | 305 | /* Standard Options */ |
d231781a | 306 | { "port", sPort, SSHCFG_GLOBAL }, |
307 | { "hostkey", sHostKeyFile, SSHCFG_GLOBAL }, | |
308 | { "hostdsakey", sHostKeyFile, SSHCFG_GLOBAL }, /* alias */ | |
309 | { "pidfile", sPidFile, SSHCFG_GLOBAL }, | |
310 | { "serverkeybits", sServerKeyBits, SSHCFG_GLOBAL }, | |
311 | { "logingracetime", sLoginGraceTime, SSHCFG_GLOBAL }, | |
312 | { "keyregenerationinterval", sKeyRegenerationTime, SSHCFG_GLOBAL }, | |
313 | { "permitrootlogin", sPermitRootLogin, SSHCFG_GLOBAL }, | |
314 | { "syslogfacility", sLogFacility, SSHCFG_GLOBAL }, | |
315 | { "loglevel", sLogLevel, SSHCFG_GLOBAL }, | |
316 | { "rhostsauthentication", sDeprecated, SSHCFG_GLOBAL }, | |
317 | { "rhostsrsaauthentication", sRhostsRSAAuthentication, SSHCFG_GLOBAL }, | |
318 | { "hostbasedauthentication", sHostbasedAuthentication, SSHCFG_GLOBAL }, | |
319 | { "hostbasedusesnamefrompacketonly", sHostbasedUsesNameFromPacketOnly, SSHCFG_GLOBAL }, | |
320 | { "rsaauthentication", sRSAAuthentication, SSHCFG_GLOBAL }, | |
321 | { "pubkeyauthentication", sPubkeyAuthentication, SSHCFG_GLOBAL }, | |
322 | { "dsaauthentication", sPubkeyAuthentication, SSHCFG_GLOBAL }, /* alias */ | |
1c590258 | 323 | #ifdef KRB5 |
d231781a | 324 | { "kerberosauthentication", sKerberosAuthentication, SSHCFG_GLOBAL }, |
325 | { "kerberosorlocalpasswd", sKerberosOrLocalPasswd, SSHCFG_GLOBAL }, | |
326 | { "kerberosticketcleanup", sKerberosTicketCleanup, SSHCFG_GLOBAL }, | |
bcfcc5f9 | 327 | #ifdef USE_AFS |
d231781a | 328 | { "kerberosgetafstoken", sKerberosGetAFSToken, SSHCFG_GLOBAL }, |
309af4e5 | 329 | #else |
d231781a | 330 | { "kerberosgetafstoken", sUnsupported, SSHCFG_GLOBAL }, |
309af4e5 | 331 | #endif |
a2144546 | 332 | #else |
d231781a | 333 | { "kerberosauthentication", sUnsupported, SSHCFG_GLOBAL }, |
334 | { "kerberosorlocalpasswd", sUnsupported, SSHCFG_GLOBAL }, | |
335 | { "kerberosticketcleanup", sUnsupported, SSHCFG_GLOBAL }, | |
336 | { "kerberosgetafstoken", sUnsupported, SSHCFG_GLOBAL }, | |
a2144546 | 337 | #endif |
d231781a | 338 | { "kerberostgtpassing", sUnsupported, SSHCFG_GLOBAL }, |
339 | { "afstokenpassing", sUnsupported, SSHCFG_GLOBAL }, | |
7364bd04 | 340 | #ifdef GSSAPI |
d231781a | 341 | { "gssapiauthentication", sGssAuthentication, SSHCFG_GLOBAL }, |
342 | { "gssapicleanupcredentials", sGssCleanupCreds, SSHCFG_GLOBAL }, | |
7364bd04 | 343 | #else |
d231781a | 344 | { "gssapiauthentication", sUnsupported, SSHCFG_GLOBAL }, |
345 | { "gssapicleanupcredentials", sUnsupported, SSHCFG_GLOBAL }, | |
7364bd04 | 346 | #endif |
d231781a | 347 | { "passwordauthentication", sPasswordAuthentication, SSHCFG_GLOBAL }, |
348 | { "kbdinteractiveauthentication", sKbdInteractiveAuthentication, SSHCFG_GLOBAL }, | |
349 | { "challengeresponseauthentication", sChallengeResponseAuthentication, SSHCFG_GLOBAL }, | |
350 | { "skeyauthentication", sChallengeResponseAuthentication, SSHCFG_GLOBAL }, /* alias */ | |
351 | { "checkmail", sDeprecated, SSHCFG_GLOBAL }, | |
352 | { "listenaddress", sListenAddress, SSHCFG_GLOBAL }, | |
353 | { "addressfamily", sAddressFamily, SSHCFG_GLOBAL }, | |
354 | { "printmotd", sPrintMotd, SSHCFG_GLOBAL }, | |
355 | { "printlastlog", sPrintLastLog, SSHCFG_GLOBAL }, | |
356 | { "ignorerhosts", sIgnoreRhosts, SSHCFG_GLOBAL }, | |
357 | { "ignoreuserknownhosts", sIgnoreUserKnownHosts, SSHCFG_GLOBAL }, | |
358 | { "x11forwarding", sX11Forwarding, SSHCFG_GLOBAL }, | |
359 | { "x11displayoffset", sX11DisplayOffset, SSHCFG_GLOBAL }, | |
360 | { "x11uselocalhost", sX11UseLocalhost, SSHCFG_GLOBAL }, | |
361 | { "xauthlocation", sXAuthLocation, SSHCFG_GLOBAL }, | |
362 | { "strictmodes", sStrictModes, SSHCFG_GLOBAL }, | |
363 | { "permitemptypasswords", sEmptyPasswd, SSHCFG_GLOBAL }, | |
364 | { "permituserenvironment", sPermitUserEnvironment, SSHCFG_GLOBAL }, | |
365 | { "uselogin", sUseLogin, SSHCFG_GLOBAL }, | |
366 | { "compression", sCompression, SSHCFG_GLOBAL }, | |
367 | { "tcpkeepalive", sTCPKeepAlive, SSHCFG_GLOBAL }, | |
368 | { "keepalive", sTCPKeepAlive, SSHCFG_GLOBAL }, /* obsolete alias */ | |
369 | { "allowtcpforwarding", sAllowTcpForwarding, SSHCFG_ALL }, | |
370 | { "allowusers", sAllowUsers, SSHCFG_GLOBAL }, | |
371 | { "denyusers", sDenyUsers, SSHCFG_GLOBAL }, | |
372 | { "allowgroups", sAllowGroups, SSHCFG_GLOBAL }, | |
373 | { "denygroups", sDenyGroups, SSHCFG_GLOBAL }, | |
374 | { "ciphers", sCiphers, SSHCFG_GLOBAL }, | |
375 | { "macs", sMacs, SSHCFG_GLOBAL }, | |
376 | { "protocol", sProtocol, SSHCFG_GLOBAL }, | |
377 | { "gatewayports", sGatewayPorts, SSHCFG_ALL }, | |
378 | { "subsystem", sSubsystem, SSHCFG_GLOBAL }, | |
379 | { "maxstartups", sMaxStartups, SSHCFG_GLOBAL }, | |
380 | { "maxauthtries", sMaxAuthTries, SSHCFG_GLOBAL }, | |
381 | { "banner", sBanner, SSHCFG_GLOBAL }, | |
382 | { "usedns", sUseDNS, SSHCFG_GLOBAL }, | |
383 | { "verifyreversemapping", sDeprecated, SSHCFG_GLOBAL }, | |
384 | { "reversemappingcheck", sDeprecated, SSHCFG_GLOBAL }, | |
385 | { "clientaliveinterval", sClientAliveInterval, SSHCFG_GLOBAL }, | |
386 | { "clientalivecountmax", sClientAliveCountMax, SSHCFG_GLOBAL }, | |
387 | { "authorizedkeysfile", sAuthorizedKeysFile, SSHCFG_GLOBAL }, | |
388 | { "authorizedkeysfile2", sAuthorizedKeysFile2, SSHCFG_GLOBAL }, | |
389 | { "useprivilegeseparation", sUsePrivilegeSeparation, SSHCFG_GLOBAL }, | |
390 | { "acceptenv", sAcceptEnv, SSHCFG_GLOBAL }, | |
391 | { "permittunnel", sPermitTunnel, SSHCFG_GLOBAL }, | |
392 | { NULL, sBadOption, 0 } | |
8efc0c15 | 393 | }; |
394 | ||
aa3378df | 395 | /* |
6be9a5e8 | 396 | * Returns the number of the token pointed to by cp or sBadOption. |
aa3378df | 397 | */ |
8efc0c15 | 398 | |
6ae2364d | 399 | static ServerOpCodes |
5260325f | 400 | parse_token(const char *cp, const char *filename, |
d231781a | 401 | int linenum, u_int *flags) |
8efc0c15 | 402 | { |
1e3b8b07 | 403 | u_int i; |
8efc0c15 | 404 | |
5260325f | 405 | for (i = 0; keywords[i].name; i++) |
d231781a | 406 | if (strcasecmp(cp, keywords[i].name) == 0) { |
407 | *flags = keywords[i].flags; | |
5260325f | 408 | return keywords[i].opcode; |
d231781a | 409 | } |
8efc0c15 | 410 | |
b7c70970 | 411 | error("%s: line %d: Bad configuration option: %s", |
412 | filename, linenum, cp); | |
5260325f | 413 | return sBadOption; |
8efc0c15 | 414 | } |
415 | ||
396c147e | 416 | static void |
2d2a2c65 | 417 | add_listen_addr(ServerOptions *options, char *addr, u_short port) |
48e671d5 | 418 | { |
2ceb8101 | 419 | u_int i; |
48e671d5 | 420 | |
421 | if (options->num_ports == 0) | |
422 | options->ports[options->num_ports++] = SSH_DEFAULT_PORT; | |
31b41ceb | 423 | if (options->address_family == -1) |
424 | options->address_family = AF_UNSPEC; | |
2d2a2c65 | 425 | if (port == 0) |
d11c1288 | 426 | for (i = 0; i < options->num_ports; i++) |
427 | add_one_listen_addr(options, addr, options->ports[i]); | |
428 | else | |
2d2a2c65 | 429 | add_one_listen_addr(options, addr, port); |
d11c1288 | 430 | } |
431 | ||
396c147e | 432 | static void |
d11c1288 | 433 | add_one_listen_addr(ServerOptions *options, char *addr, u_short port) |
434 | { | |
435 | struct addrinfo hints, *ai, *aitop; | |
436 | char strport[NI_MAXSERV]; | |
437 | int gaierr; | |
438 | ||
439 | memset(&hints, 0, sizeof(hints)); | |
31b41ceb | 440 | hints.ai_family = options->address_family; |
d11c1288 | 441 | hints.ai_socktype = SOCK_STREAM; |
442 | hints.ai_flags = (addr == NULL) ? AI_PASSIVE : 0; | |
7528d467 | 443 | snprintf(strport, sizeof strport, "%u", port); |
d11c1288 | 444 | if ((gaierr = getaddrinfo(addr, strport, &hints, &aitop)) != 0) |
445 | fatal("bad addr or host: %s (%s)", | |
446 | addr ? addr : "<NULL>", | |
447 | gai_strerror(gaierr)); | |
448 | for (ai = aitop; ai->ai_next; ai = ai->ai_next) | |
449 | ; | |
450 | ai->ai_next = options->listen_addrs; | |
451 | options->listen_addrs = aitop; | |
48e671d5 | 452 | } |
453 | ||
d231781a | 454 | /* |
455 | * The strategy for the Match blocks is that the config file is parsed twice. | |
456 | * | |
457 | * The first time is at startup. activep is initialized to 1 and the | |
458 | * directives in the global context are processed and acted on. Hitting a | |
459 | * Match directive unsets activep and the directives inside the block are | |
460 | * checked for syntax only. | |
461 | * | |
462 | * The second time is after a connection has been established but before | |
463 | * authentication. activep is initialized to 2 and global config directives | |
464 | * are ignored since they have already been processed. If the criteria in a | |
465 | * Match block is met, activep is set and the subsequent directives | |
466 | * processed and actioned until EOF or another Match block unsets it. Any | |
467 | * options set are copied into the main server config. | |
468 | * | |
469 | * Potential additions/improvements: | |
470 | * - Add Match support for pre-kex directives, eg Protocol, Ciphers. | |
471 | * | |
472 | * - Add a Tag directive (idea from David Leonard) ala pf, eg: | |
473 | * Match Address 192.168.0.* | |
474 | * Tag trusted | |
475 | * Match Group wheel | |
476 | * Tag trusted | |
477 | * Match Tag trusted | |
478 | * AllowTcpForwarding yes | |
479 | * GatewayPorts clientspecified | |
480 | * [...] | |
481 | * | |
482 | * - Add a PermittedChannelRequests directive | |
483 | * Match Group shell | |
484 | * PermittedChannelRequests session,forwarded-tcpip | |
485 | */ | |
486 | ||
487 | static int | |
488 | match_cfg_line(char **condition, int line, const char *user, const char *host, | |
489 | const char *address) | |
490 | { | |
491 | int result = 1; | |
492 | char *arg, *attrib, *cp = *condition; | |
493 | size_t len; | |
494 | ||
495 | if (user == NULL) | |
496 | debug3("checking syntax for 'Match %s'", cp); | |
497 | else | |
498 | debug3("checking match for '%s' user %s host %s addr %s", cp, | |
499 | user ? user : "(null)", host ? host : "(null)", | |
500 | address ? address : "(null)"); | |
501 | ||
502 | while ((attrib = strdelim(&cp)) && *attrib != '\0') { | |
503 | if ((arg = strdelim(&cp)) == NULL || *arg == '\0') { | |
504 | error("Missing Match criteria for %s", attrib); | |
505 | return -1; | |
506 | } | |
507 | len = strlen(arg); | |
508 | if (strcasecmp(attrib, "user") == 0) { | |
509 | if (!user) { | |
510 | result = 0; | |
511 | continue; | |
512 | } | |
513 | if (match_pattern_list(user, arg, len, 0) != 1) | |
514 | result = 0; | |
515 | else | |
516 | debug("user %.100s matched 'User %.100s' at " | |
517 | "line %d", user, arg, line); | |
518 | } else if (strcasecmp(attrib, "host") == 0) { | |
519 | if (!host) { | |
520 | result = 0; | |
521 | continue; | |
522 | } | |
523 | if (match_hostname(host, arg, len) != 1) | |
524 | result = 0; | |
525 | else | |
526 | debug("connection from %.100s matched 'Host " | |
527 | "%.100s' at line %d", host, arg, line); | |
528 | } else if (strcasecmp(attrib, "address") == 0) { | |
529 | debug("address '%s' arg '%s'", address, arg); | |
530 | if (!address) { | |
531 | result = 0; | |
532 | continue; | |
533 | } | |
534 | if (match_hostname(address, arg, len) != 1) | |
535 | result = 0; | |
536 | else | |
537 | debug("connection from %.100s matched 'Address " | |
538 | "%.100s' at line %d", address, arg, line); | |
539 | } else { | |
540 | error("Unsupported Match attribute %s", attrib); | |
541 | return -1; | |
542 | } | |
543 | } | |
544 | if (user != NULL) | |
545 | debug3("match %sfound", result ? "" : "not "); | |
546 | *condition = cp; | |
547 | return result; | |
548 | } | |
549 | ||
2717fa0f | 550 | int |
551 | process_server_config_line(ServerOptions *options, char *line, | |
d231781a | 552 | const char *filename, int linenum, int *activep, const char *user, |
553 | const char *host, const char *address) | |
8efc0c15 | 554 | { |
d11c1288 | 555 | char *cp, **charptr, *arg, *p; |
d231781a | 556 | int cmdline = 0, *intptr, value, n; |
5260325f | 557 | ServerOpCodes opcode; |
3867aa0a | 558 | u_short port; |
d231781a | 559 | u_int i, flags = 0; |
d66ce1a1 | 560 | size_t len; |
5260325f | 561 | |
2717fa0f | 562 | cp = line; |
0f8cd5a6 | 563 | if ((arg = strdelim(&cp)) == NULL) |
88299971 | 564 | return 0; |
2717fa0f | 565 | /* Ignore leading whitespace */ |
566 | if (*arg == '\0') | |
704b1659 | 567 | arg = strdelim(&cp); |
2717fa0f | 568 | if (!arg || !*arg || *arg == '#') |
569 | return 0; | |
570 | intptr = NULL; | |
571 | charptr = NULL; | |
d231781a | 572 | opcode = parse_token(arg, filename, linenum, &flags); |
573 | ||
574 | if (activep == NULL) { /* We are processing a command line directive */ | |
575 | cmdline = 1; | |
576 | activep = &cmdline; | |
577 | } | |
578 | if (*activep && opcode != sMatch) | |
579 | debug3("%s:%d setting %s %s", filename, linenum, arg, cp); | |
580 | if (*activep == 0 && !(flags & SSHCFG_MATCH)) { | |
581 | if (user == NULL) { | |
582 | fatal("%s line %d: Directive '%s' is not allowed " | |
583 | "within a Match block", filename, linenum, arg); | |
584 | } else { /* this is a directive we have already processed */ | |
585 | while (arg) | |
586 | arg = strdelim(&cp); | |
587 | return 0; | |
588 | } | |
589 | } | |
590 | ||
2717fa0f | 591 | switch (opcode) { |
592 | /* Portable-specific options */ | |
7fceb20d | 593 | case sUsePAM: |
594 | intptr = &options->use_pam; | |
2717fa0f | 595 | goto parse_flag; |
48e671d5 | 596 | |
2717fa0f | 597 | /* Standard Options */ |
598 | case sBadOption: | |
599 | return -1; | |
600 | case sPort: | |
601 | /* ignore ports from configfile if cmdline specifies ports */ | |
602 | if (options->ports_from_cmdline) | |
603 | return 0; | |
604 | if (options->listen_addrs != NULL) | |
605 | fatal("%s line %d: ports must be specified before " | |
3a454b6a | 606 | "ListenAddress.", filename, linenum); |
2717fa0f | 607 | if (options->num_ports >= MAX_PORTS) |
608 | fatal("%s line %d: too many ports.", | |
609 | filename, linenum); | |
610 | arg = strdelim(&cp); | |
611 | if (!arg || *arg == '\0') | |
612 | fatal("%s line %d: missing port number.", | |
613 | filename, linenum); | |
614 | options->ports[options->num_ports++] = a2port(arg); | |
615 | if (options->ports[options->num_ports-1] == 0) | |
616 | fatal("%s line %d: Badly formatted port number.", | |
617 | filename, linenum); | |
618 | break; | |
619 | ||
620 | case sServerKeyBits: | |
621 | intptr = &options->server_key_bits; | |
5260325f | 622 | parse_int: |
2717fa0f | 623 | arg = strdelim(&cp); |
624 | if (!arg || *arg == '\0') | |
625 | fatal("%s line %d: missing integer value.", | |
626 | filename, linenum); | |
627 | value = atoi(arg); | |
d231781a | 628 | if (*activep && *intptr == -1) |
2717fa0f | 629 | *intptr = value; |
630 | break; | |
631 | ||
632 | case sLoginGraceTime: | |
633 | intptr = &options->login_grace_time; | |
e2b1fb42 | 634 | parse_time: |
2717fa0f | 635 | arg = strdelim(&cp); |
636 | if (!arg || *arg == '\0') | |
637 | fatal("%s line %d: missing time value.", | |
638 | filename, linenum); | |
639 | if ((value = convtime(arg)) == -1) | |
640 | fatal("%s line %d: invalid time value.", | |
641 | filename, linenum); | |
642 | if (*intptr == -1) | |
643 | *intptr = value; | |
644 | break; | |
645 | ||
646 | case sKeyRegenerationTime: | |
647 | intptr = &options->key_regeneration_time; | |
648 | goto parse_time; | |
649 | ||
650 | case sListenAddress: | |
651 | arg = strdelim(&cp); | |
3867aa0a | 652 | if (arg == NULL || *arg == '\0') |
653 | fatal("%s line %d: missing address", | |
2717fa0f | 654 | filename, linenum); |
91135a0e | 655 | /* check for bare IPv6 address: no "[]" and 2 or more ":" */ |
656 | if (strchr(arg, '[') == NULL && (p = strchr(arg, ':')) != NULL | |
657 | && strchr(p+1, ':') != NULL) { | |
658 | add_listen_addr(options, arg, 0); | |
659 | break; | |
660 | } | |
3867aa0a | 661 | p = hpdelim(&arg); |
662 | if (p == NULL) | |
663 | fatal("%s line %d: bad address:port usage", | |
2717fa0f | 664 | filename, linenum); |
3867aa0a | 665 | p = cleanhostname(p); |
666 | if (arg == NULL) | |
667 | port = 0; | |
668 | else if ((port = a2port(arg)) == 0) | |
669 | fatal("%s line %d: bad port number", filename, linenum); | |
670 | ||
671 | add_listen_addr(options, p, port); | |
672 | ||
2717fa0f | 673 | break; |
674 | ||
31b41ceb | 675 | case sAddressFamily: |
676 | arg = strdelim(&cp); | |
38634ff6 | 677 | if (!arg || *arg == '\0') |
678 | fatal("%s line %d: missing address family.", | |
679 | filename, linenum); | |
31b41ceb | 680 | intptr = &options->address_family; |
681 | if (options->listen_addrs != NULL) | |
682 | fatal("%s line %d: address family must be specified before " | |
683 | "ListenAddress.", filename, linenum); | |
684 | if (strcasecmp(arg, "inet") == 0) | |
685 | value = AF_INET; | |
686 | else if (strcasecmp(arg, "inet6") == 0) | |
687 | value = AF_INET6; | |
688 | else if (strcasecmp(arg, "any") == 0) | |
689 | value = AF_UNSPEC; | |
690 | else | |
691 | fatal("%s line %d: unsupported address family \"%s\".", | |
692 | filename, linenum, arg); | |
693 | if (*intptr == -1) | |
694 | *intptr = value; | |
695 | break; | |
696 | ||
2717fa0f | 697 | case sHostKeyFile: |
698 | intptr = &options->num_host_key_files; | |
699 | if (*intptr >= MAX_HOSTKEYS) | |
700 | fatal("%s line %d: too many host keys specified (max %d).", | |
701 | filename, linenum, MAX_HOSTKEYS); | |
702 | charptr = &options->host_key_files[*intptr]; | |
fa649821 | 703 | parse_filename: |
2717fa0f | 704 | arg = strdelim(&cp); |
705 | if (!arg || *arg == '\0') | |
706 | fatal("%s line %d: missing file name.", | |
707 | filename, linenum); | |
d231781a | 708 | if (*activep && *charptr == NULL) { |
2717fa0f | 709 | *charptr = tilde_expand_filename(arg, getuid()); |
710 | /* increase optional counter */ | |
711 | if (intptr != NULL) | |
712 | *intptr = *intptr + 1; | |
713 | } | |
714 | break; | |
0fbe8c74 | 715 | |
2717fa0f | 716 | case sPidFile: |
717 | charptr = &options->pid_file; | |
718 | goto parse_filename; | |
5260325f | 719 | |
2717fa0f | 720 | case sPermitRootLogin: |
721 | intptr = &options->permit_root_login; | |
722 | arg = strdelim(&cp); | |
723 | if (!arg || *arg == '\0') | |
724 | fatal("%s line %d: missing yes/" | |
725 | "without-password/forced-commands-only/no " | |
726 | "argument.", filename, linenum); | |
727 | value = 0; /* silence compiler */ | |
728 | if (strcmp(arg, "without-password") == 0) | |
729 | value = PERMIT_NO_PASSWD; | |
730 | else if (strcmp(arg, "forced-commands-only") == 0) | |
731 | value = PERMIT_FORCED_ONLY; | |
732 | else if (strcmp(arg, "yes") == 0) | |
733 | value = PERMIT_YES; | |
734 | else if (strcmp(arg, "no") == 0) | |
735 | value = PERMIT_NO; | |
736 | else | |
737 | fatal("%s line %d: Bad yes/" | |
738 | "without-password/forced-commands-only/no " | |
739 | "argument: %s", filename, linenum, arg); | |
740 | if (*intptr == -1) | |
741 | *intptr = value; | |
742 | break; | |
743 | ||
744 | case sIgnoreRhosts: | |
745 | intptr = &options->ignore_rhosts; | |
5260325f | 746 | parse_flag: |
2717fa0f | 747 | arg = strdelim(&cp); |
748 | if (!arg || *arg == '\0') | |
749 | fatal("%s line %d: missing yes/no argument.", | |
750 | filename, linenum); | |
751 | value = 0; /* silence compiler */ | |
752 | if (strcmp(arg, "yes") == 0) | |
753 | value = 1; | |
754 | else if (strcmp(arg, "no") == 0) | |
755 | value = 0; | |
756 | else | |
757 | fatal("%s line %d: Bad yes/no argument: %s", | |
758 | filename, linenum, arg); | |
d231781a | 759 | if (*activep && *intptr == -1) |
2717fa0f | 760 | *intptr = value; |
761 | break; | |
762 | ||
763 | case sIgnoreUserKnownHosts: | |
764 | intptr = &options->ignore_user_known_hosts; | |
765 | goto parse_flag; | |
766 | ||
2717fa0f | 767 | case sRhostsRSAAuthentication: |
768 | intptr = &options->rhosts_rsa_authentication; | |
769 | goto parse_flag; | |
770 | ||
771 | case sHostbasedAuthentication: | |
772 | intptr = &options->hostbased_authentication; | |
773 | goto parse_flag; | |
774 | ||
775 | case sHostbasedUsesNameFromPacketOnly: | |
776 | intptr = &options->hostbased_uses_name_from_packet_only; | |
777 | goto parse_flag; | |
778 | ||
779 | case sRSAAuthentication: | |
780 | intptr = &options->rsa_authentication; | |
781 | goto parse_flag; | |
782 | ||
783 | case sPubkeyAuthentication: | |
784 | intptr = &options->pubkey_authentication; | |
785 | goto parse_flag; | |
d0ec7f42 | 786 | |
2717fa0f | 787 | case sKerberosAuthentication: |
788 | intptr = &options->kerberos_authentication; | |
789 | goto parse_flag; | |
5260325f | 790 | |
2717fa0f | 791 | case sKerberosOrLocalPasswd: |
792 | intptr = &options->kerberos_or_local_passwd; | |
793 | goto parse_flag; | |
5260325f | 794 | |
2717fa0f | 795 | case sKerberosTicketCleanup: |
796 | intptr = &options->kerberos_ticket_cleanup; | |
797 | goto parse_flag; | |
d0ec7f42 | 798 | |
a1e30b47 | 799 | case sKerberosGetAFSToken: |
800 | intptr = &options->kerberos_get_afs_token; | |
801 | goto parse_flag; | |
802 | ||
7364bd04 | 803 | case sGssAuthentication: |
804 | intptr = &options->gss_authentication; | |
805 | goto parse_flag; | |
806 | ||
807 | case sGssCleanupCreds: | |
808 | intptr = &options->gss_cleanup_creds; | |
809 | goto parse_flag; | |
810 | ||
2717fa0f | 811 | case sPasswordAuthentication: |
812 | intptr = &options->password_authentication; | |
813 | goto parse_flag; | |
5260325f | 814 | |
2717fa0f | 815 | case sKbdInteractiveAuthentication: |
816 | intptr = &options->kbd_interactive_authentication; | |
817 | goto parse_flag; | |
8002af61 | 818 | |
2717fa0f | 819 | case sChallengeResponseAuthentication: |
820 | intptr = &options->challenge_response_authentication; | |
821 | goto parse_flag; | |
8002af61 | 822 | |
2717fa0f | 823 | case sPrintMotd: |
824 | intptr = &options->print_motd; | |
825 | goto parse_flag; | |
5260325f | 826 | |
2717fa0f | 827 | case sPrintLastLog: |
828 | intptr = &options->print_lastlog; | |
829 | goto parse_flag; | |
5260325f | 830 | |
2717fa0f | 831 | case sX11Forwarding: |
832 | intptr = &options->x11_forwarding; | |
833 | goto parse_flag; | |
5260325f | 834 | |
2717fa0f | 835 | case sX11DisplayOffset: |
836 | intptr = &options->x11_display_offset; | |
837 | goto parse_int; | |
8efc0c15 | 838 | |
e6e573bd | 839 | case sX11UseLocalhost: |
840 | intptr = &options->x11_use_localhost; | |
841 | goto parse_flag; | |
842 | ||
2717fa0f | 843 | case sXAuthLocation: |
844 | charptr = &options->xauth_location; | |
845 | goto parse_filename; | |
5260325f | 846 | |
2717fa0f | 847 | case sStrictModes: |
848 | intptr = &options->strict_modes; | |
849 | goto parse_flag; | |
5260325f | 850 | |
fd573618 | 851 | case sTCPKeepAlive: |
852 | intptr = &options->tcp_keep_alive; | |
2717fa0f | 853 | goto parse_flag; |
33de75a3 | 854 | |
2717fa0f | 855 | case sEmptyPasswd: |
856 | intptr = &options->permit_empty_passwd; | |
857 | goto parse_flag; | |
5260325f | 858 | |
f00bab84 | 859 | case sPermitUserEnvironment: |
860 | intptr = &options->permit_user_env; | |
861 | goto parse_flag; | |
862 | ||
2717fa0f | 863 | case sUseLogin: |
864 | intptr = &options->use_login; | |
865 | goto parse_flag; | |
5260325f | 866 | |
636f76ca | 867 | case sCompression: |
868 | intptr = &options->compression; | |
07200973 | 869 | arg = strdelim(&cp); |
870 | if (!arg || *arg == '\0') | |
871 | fatal("%s line %d: missing yes/no/delayed " | |
872 | "argument.", filename, linenum); | |
873 | value = 0; /* silence compiler */ | |
874 | if (strcmp(arg, "delayed") == 0) | |
875 | value = COMP_DELAYED; | |
876 | else if (strcmp(arg, "yes") == 0) | |
877 | value = COMP_ZLIB; | |
878 | else if (strcmp(arg, "no") == 0) | |
879 | value = COMP_NONE; | |
880 | else | |
881 | fatal("%s line %d: Bad yes/no/delayed " | |
882 | "argument: %s", filename, linenum, arg); | |
883 | if (*intptr == -1) | |
884 | *intptr = value; | |
885 | break; | |
636f76ca | 886 | |
2717fa0f | 887 | case sGatewayPorts: |
888 | intptr = &options->gateway_ports; | |
3867aa0a | 889 | arg = strdelim(&cp); |
890 | if (!arg || *arg == '\0') | |
891 | fatal("%s line %d: missing yes/no/clientspecified " | |
892 | "argument.", filename, linenum); | |
893 | value = 0; /* silence compiler */ | |
894 | if (strcmp(arg, "clientspecified") == 0) | |
895 | value = 2; | |
896 | else if (strcmp(arg, "yes") == 0) | |
897 | value = 1; | |
898 | else if (strcmp(arg, "no") == 0) | |
899 | value = 0; | |
900 | else | |
901 | fatal("%s line %d: Bad yes/no/clientspecified " | |
902 | "argument: %s", filename, linenum, arg); | |
903 | if (*intptr == -1) | |
904 | *intptr = value; | |
905 | break; | |
5260325f | 906 | |
c5a7d788 | 907 | case sUseDNS: |
908 | intptr = &options->use_dns; | |
2717fa0f | 909 | goto parse_flag; |
5260325f | 910 | |
2717fa0f | 911 | case sLogFacility: |
912 | intptr = (int *) &options->log_facility; | |
913 | arg = strdelim(&cp); | |
914 | value = log_facility_number(arg); | |
5eaf8578 | 915 | if (value == SYSLOG_FACILITY_NOT_SET) |
2717fa0f | 916 | fatal("%.200s line %d: unsupported log facility '%s'", |
917 | filename, linenum, arg ? arg : "<NONE>"); | |
918 | if (*intptr == -1) | |
919 | *intptr = (SyslogFacility) value; | |
920 | break; | |
921 | ||
922 | case sLogLevel: | |
923 | intptr = (int *) &options->log_level; | |
924 | arg = strdelim(&cp); | |
925 | value = log_level_number(arg); | |
5eaf8578 | 926 | if (value == SYSLOG_LEVEL_NOT_SET) |
2717fa0f | 927 | fatal("%.200s line %d: unsupported log level '%s'", |
928 | filename, linenum, arg ? arg : "<NONE>"); | |
929 | if (*intptr == -1) | |
930 | *intptr = (LogLevel) value; | |
931 | break; | |
932 | ||
933 | case sAllowTcpForwarding: | |
934 | intptr = &options->allow_tcp_forwarding; | |
935 | goto parse_flag; | |
936 | ||
1853d1ef | 937 | case sUsePrivilegeSeparation: |
938 | intptr = &use_privsep; | |
939 | goto parse_flag; | |
940 | ||
2717fa0f | 941 | case sAllowUsers: |
942 | while ((arg = strdelim(&cp)) && *arg != '\0') { | |
943 | if (options->num_allow_users >= MAX_ALLOW_USERS) | |
944 | fatal("%s line %d: too many allow users.", | |
945 | filename, linenum); | |
7528d467 | 946 | options->allow_users[options->num_allow_users++] = |
947 | xstrdup(arg); | |
2717fa0f | 948 | } |
949 | break; | |
a8be9f80 | 950 | |
2717fa0f | 951 | case sDenyUsers: |
952 | while ((arg = strdelim(&cp)) && *arg != '\0') { | |
953 | if (options->num_deny_users >= MAX_DENY_USERS) | |
954 | fatal( "%s line %d: too many deny users.", | |
955 | filename, linenum); | |
7528d467 | 956 | options->deny_users[options->num_deny_users++] = |
957 | xstrdup(arg); | |
2717fa0f | 958 | } |
959 | break; | |
b2552997 | 960 | |
2717fa0f | 961 | case sAllowGroups: |
962 | while ((arg = strdelim(&cp)) && *arg != '\0') { | |
963 | if (options->num_allow_groups >= MAX_ALLOW_GROUPS) | |
964 | fatal("%s line %d: too many allow groups.", | |
965 | filename, linenum); | |
7528d467 | 966 | options->allow_groups[options->num_allow_groups++] = |
967 | xstrdup(arg); | |
2717fa0f | 968 | } |
969 | break; | |
a8be9f80 | 970 | |
2717fa0f | 971 | case sDenyGroups: |
972 | while ((arg = strdelim(&cp)) && *arg != '\0') { | |
973 | if (options->num_deny_groups >= MAX_DENY_GROUPS) | |
974 | fatal("%s line %d: too many deny groups.", | |
975 | filename, linenum); | |
976 | options->deny_groups[options->num_deny_groups++] = xstrdup(arg); | |
977 | } | |
978 | break; | |
38c295d6 | 979 | |
2717fa0f | 980 | case sCiphers: |
981 | arg = strdelim(&cp); | |
982 | if (!arg || *arg == '\0') | |
983 | fatal("%s line %d: Missing argument.", filename, linenum); | |
984 | if (!ciphers_valid(arg)) | |
985 | fatal("%s line %d: Bad SSH2 cipher spec '%s'.", | |
986 | filename, linenum, arg ? arg : "<NONE>"); | |
987 | if (options->ciphers == NULL) | |
988 | options->ciphers = xstrdup(arg); | |
989 | break; | |
990 | ||
991 | case sMacs: | |
992 | arg = strdelim(&cp); | |
993 | if (!arg || *arg == '\0') | |
994 | fatal("%s line %d: Missing argument.", filename, linenum); | |
995 | if (!mac_valid(arg)) | |
996 | fatal("%s line %d: Bad SSH2 mac spec '%s'.", | |
997 | filename, linenum, arg ? arg : "<NONE>"); | |
998 | if (options->macs == NULL) | |
999 | options->macs = xstrdup(arg); | |
1000 | break; | |
1001 | ||
1002 | case sProtocol: | |
1003 | intptr = &options->protocol; | |
1004 | arg = strdelim(&cp); | |
1005 | if (!arg || *arg == '\0') | |
1006 | fatal("%s line %d: Missing argument.", filename, linenum); | |
1007 | value = proto_spec(arg); | |
1008 | if (value == SSH_PROTO_UNKNOWN) | |
1009 | fatal("%s line %d: Bad protocol spec '%s'.", | |
184eed6a | 1010 | filename, linenum, arg ? arg : "<NONE>"); |
2717fa0f | 1011 | if (*intptr == SSH_PROTO_UNKNOWN) |
1012 | *intptr = value; | |
1013 | break; | |
1014 | ||
1015 | case sSubsystem: | |
1016 | if (options->num_subsystems >= MAX_SUBSYSTEMS) { | |
1017 | fatal("%s line %d: too many subsystems defined.", | |
184eed6a | 1018 | filename, linenum); |
2717fa0f | 1019 | } |
1020 | arg = strdelim(&cp); | |
1021 | if (!arg || *arg == '\0') | |
1022 | fatal("%s line %d: Missing subsystem name.", | |
184eed6a | 1023 | filename, linenum); |
d231781a | 1024 | if (!*activep) { |
1025 | arg = strdelim(&cp); | |
1026 | break; | |
1027 | } | |
2717fa0f | 1028 | for (i = 0; i < options->num_subsystems; i++) |
1029 | if (strcmp(arg, options->subsystem_name[i]) == 0) | |
1030 | fatal("%s line %d: Subsystem '%s' already defined.", | |
184eed6a | 1031 | filename, linenum, arg); |
2717fa0f | 1032 | options->subsystem_name[options->num_subsystems] = xstrdup(arg); |
1033 | arg = strdelim(&cp); | |
1034 | if (!arg || *arg == '\0') | |
1035 | fatal("%s line %d: Missing subsystem command.", | |
184eed6a | 1036 | filename, linenum); |
2717fa0f | 1037 | options->subsystem_command[options->num_subsystems] = xstrdup(arg); |
d66ce1a1 | 1038 | |
1039 | /* Collect arguments (separate to executable) */ | |
1040 | p = xstrdup(arg); | |
1041 | len = strlen(p) + 1; | |
1042 | while ((arg = strdelim(&cp)) != NULL && *arg != '\0') { | |
1043 | len += 1 + strlen(arg); | |
1044 | p = xrealloc(p, 1, len); | |
1045 | strlcat(p, " ", len); | |
1046 | strlcat(p, arg, len); | |
1047 | } | |
1048 | options->subsystem_args[options->num_subsystems] = p; | |
2717fa0f | 1049 | options->num_subsystems++; |
1050 | break; | |
1051 | ||
1052 | case sMaxStartups: | |
1053 | arg = strdelim(&cp); | |
1054 | if (!arg || *arg == '\0') | |
1055 | fatal("%s line %d: Missing MaxStartups spec.", | |
184eed6a | 1056 | filename, linenum); |
2717fa0f | 1057 | if ((n = sscanf(arg, "%d:%d:%d", |
1058 | &options->max_startups_begin, | |
1059 | &options->max_startups_rate, | |
1060 | &options->max_startups)) == 3) { | |
1061 | if (options->max_startups_begin > | |
1062 | options->max_startups || | |
1063 | options->max_startups_rate > 100 || | |
1064 | options->max_startups_rate < 1) | |
c345cf9d | 1065 | fatal("%s line %d: Illegal MaxStartups spec.", |
97de229c | 1066 | filename, linenum); |
2717fa0f | 1067 | } else if (n != 1) |
1068 | fatal("%s line %d: Illegal MaxStartups spec.", | |
1069 | filename, linenum); | |
1070 | else | |
1071 | options->max_startups = options->max_startups_begin; | |
1072 | break; | |
1073 | ||
af4bd935 | 1074 | case sMaxAuthTries: |
1075 | intptr = &options->max_authtries; | |
1076 | goto parse_int; | |
1077 | ||
2717fa0f | 1078 | case sBanner: |
1079 | charptr = &options->banner; | |
1080 | goto parse_filename; | |
1081 | /* | |
1082 | * These options can contain %X options expanded at | |
1083 | * connect time, so that you can specify paths like: | |
1084 | * | |
1085 | * AuthorizedKeysFile /etc/ssh_keys/%u | |
1086 | */ | |
1087 | case sAuthorizedKeysFile: | |
1088 | case sAuthorizedKeysFile2: | |
1089 | charptr = (opcode == sAuthorizedKeysFile ) ? | |
1090 | &options->authorized_keys_file : | |
1091 | &options->authorized_keys_file2; | |
1092 | goto parse_filename; | |
1093 | ||
1094 | case sClientAliveInterval: | |
1095 | intptr = &options->client_alive_interval; | |
1096 | goto parse_time; | |
1097 | ||
1098 | case sClientAliveCountMax: | |
1099 | intptr = &options->client_alive_count_max; | |
1100 | goto parse_int; | |
1101 | ||
61a2c1da | 1102 | case sAcceptEnv: |
1103 | while ((arg = strdelim(&cp)) && *arg != '\0') { | |
1104 | if (strchr(arg, '=') != NULL) | |
1105 | fatal("%s line %d: Invalid environment name.", | |
1106 | filename, linenum); | |
1107 | if (options->num_accept_env >= MAX_ACCEPT_ENV) | |
1108 | fatal("%s line %d: too many allow env.", | |
1109 | filename, linenum); | |
d231781a | 1110 | if (!*activep) |
1111 | break; | |
61a2c1da | 1112 | options->accept_env[options->num_accept_env++] = |
1113 | xstrdup(arg); | |
1114 | } | |
1115 | break; | |
1116 | ||
d20f3c9e | 1117 | case sPermitTunnel: |
1118 | intptr = &options->permit_tun; | |
a4f24bf8 | 1119 | arg = strdelim(&cp); |
1120 | if (!arg || *arg == '\0') | |
1121 | fatal("%s line %d: Missing yes/point-to-point/" | |
1122 | "ethernet/no argument.", filename, linenum); | |
1123 | value = 0; /* silence compiler */ | |
1124 | if (strcasecmp(arg, "ethernet") == 0) | |
1125 | value = SSH_TUNMODE_ETHERNET; | |
1126 | else if (strcasecmp(arg, "point-to-point") == 0) | |
1127 | value = SSH_TUNMODE_POINTOPOINT; | |
1128 | else if (strcasecmp(arg, "yes") == 0) | |
1129 | value = SSH_TUNMODE_YES; | |
1130 | else if (strcasecmp(arg, "no") == 0) | |
1131 | value = SSH_TUNMODE_NO; | |
1132 | else | |
1133 | fatal("%s line %d: Bad yes/point-to-point/ethernet/" | |
1134 | "no argument: %s", filename, linenum, arg); | |
1135 | if (*intptr == -1) | |
1136 | *intptr = value; | |
1137 | break; | |
d20f3c9e | 1138 | |
d231781a | 1139 | case sMatch: |
1140 | if (cmdline) | |
1141 | fatal("Match directive not supported as a command-line " | |
1142 | "option"); | |
1143 | value = match_cfg_line(&cp, linenum, user, host, address); | |
1144 | if (value < 0) | |
1145 | fatal("%s line %d: Bad Match condition", filename, | |
1146 | linenum); | |
1147 | *activep = value; | |
1148 | break; | |
1149 | ||
2717fa0f | 1150 | case sDeprecated: |
bbe88b6d | 1151 | logit("%s line %d: Deprecated option %s", |
2717fa0f | 1152 | filename, linenum, arg); |
1153 | while (arg) | |
1154 | arg = strdelim(&cp); | |
1155 | break; | |
1156 | ||
a2144546 | 1157 | case sUnsupported: |
1158 | logit("%s line %d: Unsupported option %s", | |
1159 | filename, linenum, arg); | |
1160 | while (arg) | |
1161 | arg = strdelim(&cp); | |
1162 | break; | |
1163 | ||
2717fa0f | 1164 | default: |
1165 | fatal("%s line %d: Missing handler for opcode %s (%d)", | |
1166 | filename, linenum, arg, opcode); | |
1167 | } | |
1168 | if ((arg = strdelim(&cp)) != NULL && *arg != '\0') | |
1169 | fatal("%s line %d: garbage at end of line; \"%.200s\".", | |
1170 | filename, linenum, arg); | |
1171 | return 0; | |
1172 | } | |
089fbbd2 | 1173 | |
2717fa0f | 1174 | /* Reads the server configuration file. */ |
5c53a31e | 1175 | |
2717fa0f | 1176 | void |
b9a549d7 | 1177 | load_server_config(const char *filename, Buffer *conf) |
2717fa0f | 1178 | { |
b9a549d7 | 1179 | char line[1024], *cp; |
7528d467 | 1180 | FILE *f; |
2717fa0f | 1181 | |
b9a549d7 | 1182 | debug2("%s: filename %s", __func__, filename); |
1183 | if ((f = fopen(filename, "r")) == NULL) { | |
2717fa0f | 1184 | perror(filename); |
1185 | exit(1); | |
1186 | } | |
b9a549d7 | 1187 | buffer_clear(conf); |
2717fa0f | 1188 | while (fgets(line, sizeof(line), f)) { |
b9a549d7 | 1189 | /* |
1190 | * Trim out comments and strip whitespace | |
f2107e97 | 1191 | * NB - preserve newlines, they are needed to reproduce |
b9a549d7 | 1192 | * line numbers later for error messages |
1193 | */ | |
1194 | if ((cp = strchr(line, '#')) != NULL) | |
1195 | memcpy(cp, "\n", 2); | |
1196 | cp = line + strspn(line, " \t\r"); | |
1197 | ||
1198 | buffer_append(conf, cp, strlen(cp)); | |
8efc0c15 | 1199 | } |
b9a549d7 | 1200 | buffer_append(conf, "\0", 1); |
5260325f | 1201 | fclose(f); |
b9a549d7 | 1202 | debug2("%s: done config len = %d", __func__, buffer_len(conf)); |
1203 | } | |
1204 | ||
1205 | void | |
d231781a | 1206 | parse_server_match_config(ServerOptions *options, const char *user, |
1207 | const char *host, const char *address) | |
1208 | { | |
1209 | ServerOptions mo; | |
1210 | ||
1211 | initialize_server_options(&mo); | |
1212 | parse_server_config(&mo, "reprocess config", &cfg, user, host, address); | |
1213 | copy_set_server_options(options, &mo); | |
1214 | } | |
1215 | ||
1216 | /* Copy any (supported) values that are set */ | |
1217 | void | |
1218 | copy_set_server_options(ServerOptions *dst, ServerOptions *src) | |
1219 | { | |
1220 | if (src->allow_tcp_forwarding != -1) | |
1221 | dst->allow_tcp_forwarding = src->allow_tcp_forwarding; | |
1222 | if (src->gateway_ports != -1) | |
1223 | dst->gateway_ports = src->gateway_ports; | |
1224 | } | |
1225 | ||
1226 | void | |
1227 | parse_server_config(ServerOptions *options, const char *filename, Buffer *conf, | |
1228 | const char *user, const char *host, const char *address) | |
b9a549d7 | 1229 | { |
d231781a | 1230 | int active, linenum, bad_options = 0; |
16acb158 | 1231 | char *cp, *obuf, *cbuf; |
b9a549d7 | 1232 | |
1233 | debug2("%s: config %s len %d", __func__, filename, buffer_len(conf)); | |
1234 | ||
16acb158 | 1235 | obuf = cbuf = xstrdup(buffer_ptr(conf)); |
d231781a | 1236 | active = user ? 0 : 1; |
861cc543 | 1237 | linenum = 1; |
f8cc7664 | 1238 | while ((cp = strsep(&cbuf, "\n")) != NULL) { |
b9a549d7 | 1239 | if (process_server_config_line(options, cp, filename, |
d231781a | 1240 | linenum++, &active, user, host, address) != 0) |
b9a549d7 | 1241 | bad_options++; |
1242 | } | |
16acb158 | 1243 | xfree(obuf); |
b7c70970 | 1244 | if (bad_options > 0) |
1245 | fatal("%s: terminating, %d bad configuration options", | |
1246 | filename, bad_options); | |
8efc0c15 | 1247 | } |