servconf.c revision 323136
1 2/* $OpenBSD: servconf.c,v 1.306 2017/03/14 07:19:07 djm Exp $ */ 3/* 4 * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland 5 * All rights reserved 6 * 7 * As far as I am concerned, the code I have written for this software 8 * can be used freely for any purpose. Any derived versions of this 9 * software must be clearly marked as such, and if the derived work is 10 * incompatible with the protocol description in the RFC file, it must be 11 * called by a name other than "ssh" or "Secure Shell". 12 */ 13 14#include "includes.h" 15__RCSID("$FreeBSD: stable/11/crypto/openssh/servconf.c 323136 2017-09-02 23:39:51Z des $"); 16 17#include <sys/types.h> 18#include <sys/socket.h> 19 20#include <netinet/in.h> 21#include <netinet/in_systm.h> 22#include <netinet/ip.h> 23 24#include <ctype.h> 25#include <fcntl.h> 26#include <netdb.h> 27#include <pwd.h> 28#include <stdio.h> 29#include <stdlib.h> 30#include <string.h> 31#include <signal.h> 32#include <unistd.h> 33#include <limits.h> 34#include <stdarg.h> 35#include <errno.h> 36#ifdef HAVE_UTIL_H 37#include <util.h> 38#endif 39 40#include "openbsd-compat/sys-queue.h" 41#include "xmalloc.h" 42#include "ssh.h" 43#include "log.h" 44#include "buffer.h" 45#include "misc.h" 46#include "servconf.h" 47#include "compat.h" 48#include "pathnames.h" 49#include "cipher.h" 50#include "key.h" 51#include "kex.h" 52#include "mac.h" 53#include "match.h" 54#include "channels.h" 55#include "groupaccess.h" 56#include "canohost.h" 57#include "packet.h" 58#include "hostfile.h" 59#include "auth.h" 60#include "myproposal.h" 61#include "digest.h" 62#include "version.h" 63 64static void add_listen_addr(ServerOptions *, char *, int); 65static void add_one_listen_addr(ServerOptions *, char *, int); 66 67/* Use of privilege separation or not */ 68extern int use_privsep; 69extern Buffer cfg; 70 71/* Initializes the server options to their default values. */ 72 73void 74initialize_server_options(ServerOptions *options) 75{ 76 memset(options, 0, sizeof(*options)); 77 78 /* Portable-specific options */ 79 options->use_pam = -1; 80 81 /* Standard Options */ 82 options->num_ports = 0; 83 options->ports_from_cmdline = 0; 84 options->queued_listen_addrs = NULL; 85 options->num_queued_listens = 0; 86 options->listen_addrs = NULL; 87 options->address_family = -1; 88 options->num_host_key_files = 0; 89 options->num_host_cert_files = 0; 90 options->host_key_agent = NULL; 91 options->pid_file = NULL; 92 options->login_grace_time = -1; 93 options->permit_root_login = PERMIT_NOT_SET; 94 options->ignore_rhosts = -1; 95 options->ignore_user_known_hosts = -1; 96 options->print_motd = -1; 97 options->print_lastlog = -1; 98 options->x11_forwarding = -1; 99 options->x11_display_offset = -1; 100 options->x11_use_localhost = -1; 101 options->permit_tty = -1; 102 options->permit_user_rc = -1; 103 options->xauth_location = NULL; 104 options->strict_modes = -1; 105 options->tcp_keep_alive = -1; 106 options->log_facility = SYSLOG_FACILITY_NOT_SET; 107 options->log_level = SYSLOG_LEVEL_NOT_SET; 108 options->hostbased_authentication = -1; 109 options->hostbased_uses_name_from_packet_only = -1; 110 options->hostbased_key_types = NULL; 111 options->hostkeyalgorithms = NULL; 112 options->pubkey_authentication = -1; 113 options->pubkey_key_types = NULL; 114 options->kerberos_authentication = -1; 115 options->kerberos_or_local_passwd = -1; 116 options->kerberos_ticket_cleanup = -1; 117 options->kerberos_get_afs_token = -1; 118 options->gss_authentication=-1; 119 options->gss_cleanup_creds = -1; 120 options->gss_strict_acceptor = -1; 121 options->password_authentication = -1; 122 options->kbd_interactive_authentication = -1; 123 options->challenge_response_authentication = -1; 124 options->permit_empty_passwd = -1; 125 options->permit_user_env = -1; 126 options->compression = -1; 127 options->rekey_limit = -1; 128 options->rekey_interval = -1; 129 options->allow_tcp_forwarding = -1; 130 options->allow_streamlocal_forwarding = -1; 131 options->allow_agent_forwarding = -1; 132 options->num_allow_users = 0; 133 options->num_deny_users = 0; 134 options->num_allow_groups = 0; 135 options->num_deny_groups = 0; 136 options->ciphers = NULL; 137 options->macs = NULL; 138 options->kex_algorithms = NULL; 139 options->fwd_opts.gateway_ports = -1; 140 options->fwd_opts.streamlocal_bind_mask = (mode_t)-1; 141 options->fwd_opts.streamlocal_bind_unlink = -1; 142 options->num_subsystems = 0; 143 options->max_startups_begin = -1; 144 options->max_startups_rate = -1; 145 options->max_startups = -1; 146 options->max_authtries = -1; 147 options->max_sessions = -1; 148 options->banner = NULL; 149 options->use_dns = -1; 150 options->client_alive_interval = -1; 151 options->client_alive_count_max = -1; 152 options->num_authkeys_files = 0; 153 options->num_accept_env = 0; 154 options->permit_tun = -1; 155 options->num_permitted_opens = -1; 156 options->adm_forced_command = NULL; 157 options->chroot_directory = NULL; 158 options->authorized_keys_command = NULL; 159 options->authorized_keys_command_user = NULL; 160 options->revoked_keys_file = NULL; 161 options->trusted_user_ca_keys = NULL; 162 options->authorized_principals_file = NULL; 163 options->authorized_principals_command = NULL; 164 options->authorized_principals_command_user = NULL; 165 options->ip_qos_interactive = -1; 166 options->ip_qos_bulk = -1; 167 options->version_addendum = NULL; 168 options->fingerprint_hash = -1; 169 options->disable_forwarding = -1; 170 options->use_blacklist = -1; 171} 172 173/* Returns 1 if a string option is unset or set to "none" or 0 otherwise. */ 174static int 175option_clear_or_none(const char *o) 176{ 177 return o == NULL || strcasecmp(o, "none") == 0; 178} 179 180static void 181assemble_algorithms(ServerOptions *o) 182{ 183 if (kex_assemble_names(KEX_SERVER_ENCRYPT, &o->ciphers) != 0 || 184 kex_assemble_names(KEX_SERVER_MAC, &o->macs) != 0 || 185 kex_assemble_names(KEX_SERVER_KEX, &o->kex_algorithms) != 0 || 186 kex_assemble_names(KEX_DEFAULT_PK_ALG, 187 &o->hostkeyalgorithms) != 0 || 188 kex_assemble_names(KEX_DEFAULT_PK_ALG, 189 &o->hostbased_key_types) != 0 || 190 kex_assemble_names(KEX_DEFAULT_PK_ALG, &o->pubkey_key_types) != 0) 191 fatal("kex_assemble_names failed"); 192} 193 194void 195fill_default_server_options(ServerOptions *options) 196{ 197 int i; 198 199 /* Portable-specific options */ 200 if (options->use_pam == -1) 201 options->use_pam = 1; 202 203 /* Standard Options */ 204#define add_host_key_file(path) \ 205 do { \ 206 if (access((path), O_RDONLY) == 0) \ 207 options->host_key_files \ 208 [options->num_host_key_files++] = (path); \ 209 } while (0) 210 if (options->num_host_key_files == 0) { 211 /* fill default hostkeys for protocols */ 212 add_host_key_file(_PATH_HOST_RSA_KEY_FILE); 213 add_host_key_file(_PATH_HOST_DSA_KEY_FILE); 214#ifdef OPENSSL_HAS_ECC 215 add_host_key_file(_PATH_HOST_ECDSA_KEY_FILE); 216#endif 217 add_host_key_file(_PATH_HOST_ED25519_KEY_FILE); 218 } 219#undef add_host_key_file 220 if (options->num_host_key_files == 0) 221 fatal("No host key files found"); 222 /* No certificates by default */ 223 if (options->num_ports == 0) 224 options->ports[options->num_ports++] = SSH_DEFAULT_PORT; 225 if (options->address_family == -1) 226 options->address_family = AF_UNSPEC; 227 if (options->listen_addrs == NULL) 228 add_listen_addr(options, NULL, 0); 229 if (options->pid_file == NULL) 230 options->pid_file = xstrdup(_PATH_SSH_DAEMON_PID_FILE); 231 if (options->login_grace_time == -1) 232 options->login_grace_time = 120; 233 if (options->permit_root_login == PERMIT_NOT_SET) 234 options->permit_root_login = PERMIT_NO; 235 if (options->ignore_rhosts == -1) 236 options->ignore_rhosts = 1; 237 if (options->ignore_user_known_hosts == -1) 238 options->ignore_user_known_hosts = 0; 239 if (options->print_motd == -1) 240 options->print_motd = 1; 241 if (options->print_lastlog == -1) 242 options->print_lastlog = 1; 243 if (options->x11_forwarding == -1) 244 options->x11_forwarding = 1; 245 if (options->x11_display_offset == -1) 246 options->x11_display_offset = 10; 247 if (options->x11_use_localhost == -1) 248 options->x11_use_localhost = 1; 249 if (options->xauth_location == NULL) 250 options->xauth_location = xstrdup(_PATH_XAUTH); 251 if (options->permit_tty == -1) 252 options->permit_tty = 1; 253 if (options->permit_user_rc == -1) 254 options->permit_user_rc = 1; 255 if (options->strict_modes == -1) 256 options->strict_modes = 1; 257 if (options->tcp_keep_alive == -1) 258 options->tcp_keep_alive = 1; 259 if (options->log_facility == SYSLOG_FACILITY_NOT_SET) 260 options->log_facility = SYSLOG_FACILITY_AUTH; 261 if (options->log_level == SYSLOG_LEVEL_NOT_SET) 262 options->log_level = SYSLOG_LEVEL_INFO; 263 if (options->hostbased_authentication == -1) 264 options->hostbased_authentication = 0; 265 if (options->hostbased_uses_name_from_packet_only == -1) 266 options->hostbased_uses_name_from_packet_only = 0; 267 if (options->pubkey_authentication == -1) 268 options->pubkey_authentication = 1; 269 if (options->kerberos_authentication == -1) 270 options->kerberos_authentication = 0; 271 if (options->kerberos_or_local_passwd == -1) 272 options->kerberos_or_local_passwd = 1; 273 if (options->kerberos_ticket_cleanup == -1) 274 options->kerberos_ticket_cleanup = 1; 275 if (options->kerberos_get_afs_token == -1) 276 options->kerberos_get_afs_token = 0; 277 if (options->gss_authentication == -1) 278 options->gss_authentication = 0; 279 if (options->gss_cleanup_creds == -1) 280 options->gss_cleanup_creds = 1; 281 if (options->gss_strict_acceptor == -1) 282 options->gss_strict_acceptor = 1; 283 if (options->password_authentication == -1) 284 options->password_authentication = 0; 285 if (options->kbd_interactive_authentication == -1) 286 options->kbd_interactive_authentication = 0; 287 if (options->challenge_response_authentication == -1) 288 options->challenge_response_authentication = 1; 289 if (options->permit_empty_passwd == -1) 290 options->permit_empty_passwd = 0; 291 if (options->permit_user_env == -1) 292 options->permit_user_env = 0; 293 if (options->compression == -1) 294 options->compression = COMP_DELAYED; 295 if (options->rekey_limit == -1) 296 options->rekey_limit = 0; 297 if (options->rekey_interval == -1) 298 options->rekey_interval = 0; 299 if (options->allow_tcp_forwarding == -1) 300 options->allow_tcp_forwarding = FORWARD_ALLOW; 301 if (options->allow_streamlocal_forwarding == -1) 302 options->allow_streamlocal_forwarding = FORWARD_ALLOW; 303 if (options->allow_agent_forwarding == -1) 304 options->allow_agent_forwarding = 1; 305 if (options->fwd_opts.gateway_ports == -1) 306 options->fwd_opts.gateway_ports = 0; 307 if (options->max_startups == -1) 308 options->max_startups = 100; 309 if (options->max_startups_rate == -1) 310 options->max_startups_rate = 30; /* 30% */ 311 if (options->max_startups_begin == -1) 312 options->max_startups_begin = 10; 313 if (options->max_authtries == -1) 314 options->max_authtries = DEFAULT_AUTH_FAIL_MAX; 315 if (options->max_sessions == -1) 316 options->max_sessions = DEFAULT_SESSIONS_MAX; 317 if (options->use_dns == -1) 318 options->use_dns = 1; 319 if (options->client_alive_interval == -1) 320 options->client_alive_interval = 0; 321 if (options->client_alive_count_max == -1) 322 options->client_alive_count_max = 3; 323 if (options->num_authkeys_files == 0) { 324 options->authorized_keys_files[options->num_authkeys_files++] = 325 xstrdup(_PATH_SSH_USER_PERMITTED_KEYS); 326 options->authorized_keys_files[options->num_authkeys_files++] = 327 xstrdup(_PATH_SSH_USER_PERMITTED_KEYS2); 328 } 329 if (options->permit_tun == -1) 330 options->permit_tun = SSH_TUNMODE_NO; 331 if (options->ip_qos_interactive == -1) 332 options->ip_qos_interactive = IPTOS_LOWDELAY; 333 if (options->ip_qos_bulk == -1) 334 options->ip_qos_bulk = IPTOS_THROUGHPUT; 335 if (options->version_addendum == NULL) 336 options->version_addendum = xstrdup(SSH_VERSION_FREEBSD); 337 if (options->fwd_opts.streamlocal_bind_mask == (mode_t)-1) 338 options->fwd_opts.streamlocal_bind_mask = 0177; 339 if (options->fwd_opts.streamlocal_bind_unlink == -1) 340 options->fwd_opts.streamlocal_bind_unlink = 0; 341 if (options->fingerprint_hash == -1) 342 options->fingerprint_hash = SSH_FP_HASH_DEFAULT; 343 if (options->disable_forwarding == -1) 344 options->disable_forwarding = 0; 345 if (options->use_blacklist == -1) 346 options->use_blacklist = 0; 347 348 assemble_algorithms(options); 349 350 /* Turn privilege separation and sandboxing on by default */ 351 if (use_privsep == -1) 352 use_privsep = PRIVSEP_ON; 353 354#define CLEAR_ON_NONE(v) \ 355 do { \ 356 if (option_clear_or_none(v)) { \ 357 free(v); \ 358 v = NULL; \ 359 } \ 360 } while(0) 361 CLEAR_ON_NONE(options->pid_file); 362 CLEAR_ON_NONE(options->xauth_location); 363 CLEAR_ON_NONE(options->banner); 364 CLEAR_ON_NONE(options->trusted_user_ca_keys); 365 CLEAR_ON_NONE(options->revoked_keys_file); 366 CLEAR_ON_NONE(options->authorized_principals_file); 367 CLEAR_ON_NONE(options->adm_forced_command); 368 CLEAR_ON_NONE(options->chroot_directory); 369 for (i = 0; i < options->num_host_key_files; i++) 370 CLEAR_ON_NONE(options->host_key_files[i]); 371 for (i = 0; i < options->num_host_cert_files; i++) 372 CLEAR_ON_NONE(options->host_cert_files[i]); 373#undef CLEAR_ON_NONE 374 375 /* Similar handling for AuthenticationMethods=any */ 376 if (options->num_auth_methods == 1 && 377 strcmp(options->auth_methods[0], "any") == 0) { 378 free(options->auth_methods[0]); 379 options->auth_methods[0] = NULL; 380 options->num_auth_methods = 0; 381 } 382 383#ifndef HAVE_MMAP 384 if (use_privsep && options->compression == 1) { 385 error("This platform does not support both privilege " 386 "separation and compression"); 387 error("Compression disabled"); 388 options->compression = 0; 389 } 390#endif 391 392} 393 394/* Keyword tokens. */ 395typedef enum { 396 sBadOption, /* == unknown option */ 397 /* Portable-specific options */ 398 sUsePAM, 399 /* Standard Options */ 400 sPort, sHostKeyFile, sLoginGraceTime, 401 sPermitRootLogin, sLogFacility, sLogLevel, 402 sRhostsRSAAuthentication, sRSAAuthentication, 403 sKerberosAuthentication, sKerberosOrLocalPasswd, sKerberosTicketCleanup, 404 sKerberosGetAFSToken, 405 sKerberosTgtPassing, sChallengeResponseAuthentication, 406 sPasswordAuthentication, sKbdInteractiveAuthentication, 407 sListenAddress, sAddressFamily, 408 sPrintMotd, sPrintLastLog, sIgnoreRhosts, 409 sX11Forwarding, sX11DisplayOffset, sX11UseLocalhost, 410 sPermitTTY, sStrictModes, sEmptyPasswd, sTCPKeepAlive, 411 sPermitUserEnvironment, sAllowTcpForwarding, sCompression, 412 sRekeyLimit, sAllowUsers, sDenyUsers, sAllowGroups, sDenyGroups, 413 sIgnoreUserKnownHosts, sCiphers, sMacs, sPidFile, 414 sGatewayPorts, sPubkeyAuthentication, sPubkeyAcceptedKeyTypes, 415 sXAuthLocation, sSubsystem, sMaxStartups, sMaxAuthTries, sMaxSessions, 416 sBanner, sUseDNS, sHostbasedAuthentication, 417 sHostbasedUsesNameFromPacketOnly, sHostbasedAcceptedKeyTypes, 418 sHostKeyAlgorithms, 419 sClientAliveInterval, sClientAliveCountMax, sAuthorizedKeysFile, 420 sGssAuthentication, sGssCleanupCreds, sGssStrictAcceptor, 421 sAcceptEnv, sPermitTunnel, 422 sMatch, sPermitOpen, sForceCommand, sChrootDirectory, 423 sUsePrivilegeSeparation, sAllowAgentForwarding, 424 sHostCertificate, 425 sRevokedKeys, sTrustedUserCAKeys, sAuthorizedPrincipalsFile, 426 sAuthorizedPrincipalsCommand, sAuthorizedPrincipalsCommandUser, 427 sKexAlgorithms, sIPQoS, sVersionAddendum, 428 sAuthorizedKeysCommand, sAuthorizedKeysCommandUser, 429 sAuthenticationMethods, sHostKeyAgent, sPermitUserRC, 430 sStreamLocalBindMask, sStreamLocalBindUnlink, 431 sAllowStreamLocalForwarding, sFingerprintHash, sDisableForwarding, 432 sUseBlacklist, 433 sDeprecated, sIgnore, sUnsupported 434} ServerOpCodes; 435 436#define SSHCFG_GLOBAL 0x01 /* allowed in main section of sshd_config */ 437#define SSHCFG_MATCH 0x02 /* allowed inside a Match section */ 438#define SSHCFG_ALL (SSHCFG_GLOBAL|SSHCFG_MATCH) 439 440/* Textual representation of the tokens. */ 441static struct { 442 const char *name; 443 ServerOpCodes opcode; 444 u_int flags; 445} keywords[] = { 446 /* Portable-specific options */ 447#ifdef USE_PAM 448 { "usepam", sUsePAM, SSHCFG_GLOBAL }, 449#else 450 { "usepam", sUnsupported, SSHCFG_GLOBAL }, 451#endif 452 { "pamauthenticationviakbdint", sDeprecated, SSHCFG_GLOBAL }, 453 /* Standard Options */ 454 { "port", sPort, SSHCFG_GLOBAL }, 455 { "hostkey", sHostKeyFile, SSHCFG_GLOBAL }, 456 { "hostdsakey", sHostKeyFile, SSHCFG_GLOBAL }, /* alias */ 457 { "hostkeyagent", sHostKeyAgent, SSHCFG_GLOBAL }, 458 { "pidfile", sPidFile, SSHCFG_GLOBAL }, 459 { "serverkeybits", sDeprecated, SSHCFG_GLOBAL }, 460 { "logingracetime", sLoginGraceTime, SSHCFG_GLOBAL }, 461 { "keyregenerationinterval", sDeprecated, SSHCFG_GLOBAL }, 462 { "permitrootlogin", sPermitRootLogin, SSHCFG_ALL }, 463 { "syslogfacility", sLogFacility, SSHCFG_GLOBAL }, 464 { "loglevel", sLogLevel, SSHCFG_GLOBAL }, 465 { "rhostsauthentication", sDeprecated, SSHCFG_GLOBAL }, 466 { "rhostsrsaauthentication", sDeprecated, SSHCFG_ALL }, 467 { "hostbasedauthentication", sHostbasedAuthentication, SSHCFG_ALL }, 468 { "hostbasedusesnamefrompacketonly", sHostbasedUsesNameFromPacketOnly, SSHCFG_ALL }, 469 { "hostbasedacceptedkeytypes", sHostbasedAcceptedKeyTypes, SSHCFG_ALL }, 470 { "hostkeyalgorithms", sHostKeyAlgorithms, SSHCFG_GLOBAL }, 471 { "rsaauthentication", sDeprecated, SSHCFG_ALL }, 472 { "pubkeyauthentication", sPubkeyAuthentication, SSHCFG_ALL }, 473 { "pubkeyacceptedkeytypes", sPubkeyAcceptedKeyTypes, SSHCFG_ALL }, 474 { "dsaauthentication", sPubkeyAuthentication, SSHCFG_GLOBAL }, /* alias */ 475#ifdef KRB5 476 { "kerberosauthentication", sKerberosAuthentication, SSHCFG_ALL }, 477 { "kerberosorlocalpasswd", sKerberosOrLocalPasswd, SSHCFG_GLOBAL }, 478 { "kerberosticketcleanup", sKerberosTicketCleanup, SSHCFG_GLOBAL }, 479#ifdef USE_AFS 480 { "kerberosgetafstoken", sKerberosGetAFSToken, SSHCFG_GLOBAL }, 481#else 482 { "kerberosgetafstoken", sUnsupported, SSHCFG_GLOBAL }, 483#endif 484#else 485 { "kerberosauthentication", sUnsupported, SSHCFG_ALL }, 486 { "kerberosorlocalpasswd", sUnsupported, SSHCFG_GLOBAL }, 487 { "kerberosticketcleanup", sUnsupported, SSHCFG_GLOBAL }, 488 { "kerberosgetafstoken", sUnsupported, SSHCFG_GLOBAL }, 489#endif 490 { "kerberostgtpassing", sUnsupported, SSHCFG_GLOBAL }, 491 { "afstokenpassing", sUnsupported, SSHCFG_GLOBAL }, 492#ifdef GSSAPI 493 { "gssapiauthentication", sGssAuthentication, SSHCFG_ALL }, 494 { "gssapicleanupcredentials", sGssCleanupCreds, SSHCFG_GLOBAL }, 495 { "gssapistrictacceptorcheck", sGssStrictAcceptor, SSHCFG_GLOBAL }, 496#else 497 { "gssapiauthentication", sUnsupported, SSHCFG_ALL }, 498 { "gssapicleanupcredentials", sUnsupported, SSHCFG_GLOBAL }, 499 { "gssapistrictacceptorcheck", sUnsupported, SSHCFG_GLOBAL }, 500#endif 501 { "passwordauthentication", sPasswordAuthentication, SSHCFG_ALL }, 502 { "kbdinteractiveauthentication", sKbdInteractiveAuthentication, SSHCFG_ALL }, 503 { "challengeresponseauthentication", sChallengeResponseAuthentication, SSHCFG_GLOBAL }, 504 { "skeyauthentication", sChallengeResponseAuthentication, SSHCFG_GLOBAL }, /* alias */ 505 { "checkmail", sDeprecated, SSHCFG_GLOBAL }, 506 { "listenaddress", sListenAddress, SSHCFG_GLOBAL }, 507 { "addressfamily", sAddressFamily, SSHCFG_GLOBAL }, 508 { "printmotd", sPrintMotd, SSHCFG_GLOBAL }, 509#ifdef DISABLE_LASTLOG 510 { "printlastlog", sUnsupported, SSHCFG_GLOBAL }, 511#else 512 { "printlastlog", sPrintLastLog, SSHCFG_GLOBAL }, 513#endif 514 { "ignorerhosts", sIgnoreRhosts, SSHCFG_GLOBAL }, 515 { "ignoreuserknownhosts", sIgnoreUserKnownHosts, SSHCFG_GLOBAL }, 516 { "x11forwarding", sX11Forwarding, SSHCFG_ALL }, 517 { "x11displayoffset", sX11DisplayOffset, SSHCFG_ALL }, 518 { "x11uselocalhost", sX11UseLocalhost, SSHCFG_ALL }, 519 { "xauthlocation", sXAuthLocation, SSHCFG_GLOBAL }, 520 { "strictmodes", sStrictModes, SSHCFG_GLOBAL }, 521 { "permitemptypasswords", sEmptyPasswd, SSHCFG_ALL }, 522 { "permituserenvironment", sPermitUserEnvironment, SSHCFG_GLOBAL }, 523 { "uselogin", sDeprecated, SSHCFG_GLOBAL }, 524 { "compression", sCompression, SSHCFG_GLOBAL }, 525 { "rekeylimit", sRekeyLimit, SSHCFG_ALL }, 526 { "tcpkeepalive", sTCPKeepAlive, SSHCFG_GLOBAL }, 527 { "keepalive", sTCPKeepAlive, SSHCFG_GLOBAL }, /* obsolete alias */ 528 { "allowtcpforwarding", sAllowTcpForwarding, SSHCFG_ALL }, 529 { "allowagentforwarding", sAllowAgentForwarding, SSHCFG_ALL }, 530 { "allowusers", sAllowUsers, SSHCFG_ALL }, 531 { "denyusers", sDenyUsers, SSHCFG_ALL }, 532 { "allowgroups", sAllowGroups, SSHCFG_ALL }, 533 { "denygroups", sDenyGroups, SSHCFG_ALL }, 534 { "ciphers", sCiphers, SSHCFG_GLOBAL }, 535 { "macs", sMacs, SSHCFG_GLOBAL }, 536 { "protocol", sIgnore, SSHCFG_GLOBAL }, 537 { "gatewayports", sGatewayPorts, SSHCFG_ALL }, 538 { "subsystem", sSubsystem, SSHCFG_GLOBAL }, 539 { "maxstartups", sMaxStartups, SSHCFG_GLOBAL }, 540 { "maxauthtries", sMaxAuthTries, SSHCFG_ALL }, 541 { "maxsessions", sMaxSessions, SSHCFG_ALL }, 542 { "banner", sBanner, SSHCFG_ALL }, 543 { "usedns", sUseDNS, SSHCFG_GLOBAL }, 544 { "verifyreversemapping", sDeprecated, SSHCFG_GLOBAL }, 545 { "reversemappingcheck", sDeprecated, SSHCFG_GLOBAL }, 546 { "clientaliveinterval", sClientAliveInterval, SSHCFG_ALL }, 547 { "clientalivecountmax", sClientAliveCountMax, SSHCFG_ALL }, 548 { "authorizedkeysfile", sAuthorizedKeysFile, SSHCFG_ALL }, 549 { "authorizedkeysfile2", sDeprecated, SSHCFG_ALL }, 550 { "useprivilegeseparation", sDeprecated, SSHCFG_GLOBAL}, 551 { "acceptenv", sAcceptEnv, SSHCFG_ALL }, 552 { "permittunnel", sPermitTunnel, SSHCFG_ALL }, 553 { "permittty", sPermitTTY, SSHCFG_ALL }, 554 { "permituserrc", sPermitUserRC, SSHCFG_ALL }, 555 { "match", sMatch, SSHCFG_ALL }, 556 { "permitopen", sPermitOpen, SSHCFG_ALL }, 557 { "forcecommand", sForceCommand, SSHCFG_ALL }, 558 { "chrootdirectory", sChrootDirectory, SSHCFG_ALL }, 559 { "hostcertificate", sHostCertificate, SSHCFG_GLOBAL }, 560 { "revokedkeys", sRevokedKeys, SSHCFG_ALL }, 561 { "trustedusercakeys", sTrustedUserCAKeys, SSHCFG_ALL }, 562 { "authorizedprincipalsfile", sAuthorizedPrincipalsFile, SSHCFG_ALL }, 563 { "kexalgorithms", sKexAlgorithms, SSHCFG_GLOBAL }, 564 { "ipqos", sIPQoS, SSHCFG_ALL }, 565 { "authorizedkeyscommand", sAuthorizedKeysCommand, SSHCFG_ALL }, 566 { "authorizedkeyscommanduser", sAuthorizedKeysCommandUser, SSHCFG_ALL }, 567 { "authorizedprincipalscommand", sAuthorizedPrincipalsCommand, SSHCFG_ALL }, 568 { "authorizedprincipalscommanduser", sAuthorizedPrincipalsCommandUser, SSHCFG_ALL }, 569 { "versionaddendum", sVersionAddendum, SSHCFG_GLOBAL }, 570 { "authenticationmethods", sAuthenticationMethods, SSHCFG_ALL }, 571 { "streamlocalbindmask", sStreamLocalBindMask, SSHCFG_ALL }, 572 { "streamlocalbindunlink", sStreamLocalBindUnlink, SSHCFG_ALL }, 573 { "allowstreamlocalforwarding", sAllowStreamLocalForwarding, SSHCFG_ALL }, 574 { "fingerprinthash", sFingerprintHash, SSHCFG_GLOBAL }, 575 { "disableforwarding", sDisableForwarding, SSHCFG_ALL }, 576 { "useblacklist", sUseBlacklist, SSHCFG_GLOBAL }, 577 { "noneenabled", sUnsupported, SSHCFG_ALL }, 578 { "hpndisabled", sDeprecated, SSHCFG_ALL }, 579 { "hpnbuffersize", sDeprecated, SSHCFG_ALL }, 580 { "tcprcvbufpoll", sDeprecated, SSHCFG_ALL }, 581 { NULL, sBadOption, 0 } 582}; 583 584static struct { 585 int val; 586 char *text; 587} tunmode_desc[] = { 588 { SSH_TUNMODE_NO, "no" }, 589 { SSH_TUNMODE_POINTOPOINT, "point-to-point" }, 590 { SSH_TUNMODE_ETHERNET, "ethernet" }, 591 { SSH_TUNMODE_YES, "yes" }, 592 { -1, NULL } 593}; 594 595/* 596 * Returns the number of the token pointed to by cp or sBadOption. 597 */ 598 599static ServerOpCodes 600parse_token(const char *cp, const char *filename, 601 int linenum, u_int *flags) 602{ 603 u_int i; 604 605 for (i = 0; keywords[i].name; i++) 606 if (strcasecmp(cp, keywords[i].name) == 0) { 607 *flags = keywords[i].flags; 608 return keywords[i].opcode; 609 } 610 611 error("%s: line %d: Bad configuration option: %s", 612 filename, linenum, cp); 613 return sBadOption; 614} 615 616char * 617derelativise_path(const char *path) 618{ 619 char *expanded, *ret, cwd[PATH_MAX]; 620 621 if (strcasecmp(path, "none") == 0) 622 return xstrdup("none"); 623 expanded = tilde_expand_filename(path, getuid()); 624 if (*expanded == '/') 625 return expanded; 626 if (getcwd(cwd, sizeof(cwd)) == NULL) 627 fatal("%s: getcwd: %s", __func__, strerror(errno)); 628 xasprintf(&ret, "%s/%s", cwd, expanded); 629 free(expanded); 630 return ret; 631} 632 633static void 634add_listen_addr(ServerOptions *options, char *addr, int port) 635{ 636 u_int i; 637 638 if (port == 0) 639 for (i = 0; i < options->num_ports; i++) 640 add_one_listen_addr(options, addr, options->ports[i]); 641 else 642 add_one_listen_addr(options, addr, port); 643} 644 645static void 646add_one_listen_addr(ServerOptions *options, char *addr, int port) 647{ 648 struct addrinfo hints, *ai, *aitop; 649 char strport[NI_MAXSERV]; 650 int gaierr; 651 652 memset(&hints, 0, sizeof(hints)); 653 hints.ai_family = options->address_family; 654 hints.ai_socktype = SOCK_STREAM; 655 hints.ai_flags = (addr == NULL) ? AI_PASSIVE : 0; 656 snprintf(strport, sizeof strport, "%d", port); 657 if ((gaierr = getaddrinfo(addr, strport, &hints, &aitop)) != 0) 658 fatal("bad addr or host: %s (%s)", 659 addr ? addr : "<NULL>", 660 ssh_gai_strerror(gaierr)); 661 for (ai = aitop; ai->ai_next; ai = ai->ai_next) 662 ; 663 ai->ai_next = options->listen_addrs; 664 options->listen_addrs = aitop; 665} 666 667/* 668 * Queue a ListenAddress to be processed once we have all of the Ports 669 * and AddressFamily options. 670 */ 671static void 672queue_listen_addr(ServerOptions *options, char *addr, int port) 673{ 674 options->queued_listen_addrs = xreallocarray( 675 options->queued_listen_addrs, options->num_queued_listens + 1, 676 sizeof(addr)); 677 options->queued_listen_ports = xreallocarray( 678 options->queued_listen_ports, options->num_queued_listens + 1, 679 sizeof(port)); 680 options->queued_listen_addrs[options->num_queued_listens] = 681 xstrdup(addr); 682 options->queued_listen_ports[options->num_queued_listens] = port; 683 options->num_queued_listens++; 684} 685 686/* 687 * Process queued (text) ListenAddress entries. 688 */ 689static void 690process_queued_listen_addrs(ServerOptions *options) 691{ 692 u_int i; 693 694 if (options->num_ports == 0) 695 options->ports[options->num_ports++] = SSH_DEFAULT_PORT; 696 if (options->address_family == -1) 697 options->address_family = AF_UNSPEC; 698 699 for (i = 0; i < options->num_queued_listens; i++) { 700 add_listen_addr(options, options->queued_listen_addrs[i], 701 options->queued_listen_ports[i]); 702 free(options->queued_listen_addrs[i]); 703 options->queued_listen_addrs[i] = NULL; 704 } 705 free(options->queued_listen_addrs); 706 options->queued_listen_addrs = NULL; 707 free(options->queued_listen_ports); 708 options->queued_listen_ports = NULL; 709 options->num_queued_listens = 0; 710} 711 712struct connection_info * 713get_connection_info(int populate, int use_dns) 714{ 715 struct ssh *ssh = active_state; /* XXX */ 716 static struct connection_info ci; 717 718 if (!populate) 719 return &ci; 720 ci.host = auth_get_canonical_hostname(ssh, use_dns); 721 ci.address = ssh_remote_ipaddr(ssh); 722 ci.laddress = ssh_local_ipaddr(ssh); 723 ci.lport = ssh_local_port(ssh); 724 return &ci; 725} 726 727/* 728 * The strategy for the Match blocks is that the config file is parsed twice. 729 * 730 * The first time is at startup. activep is initialized to 1 and the 731 * directives in the global context are processed and acted on. Hitting a 732 * Match directive unsets activep and the directives inside the block are 733 * checked for syntax only. 734 * 735 * The second time is after a connection has been established but before 736 * authentication. activep is initialized to 2 and global config directives 737 * are ignored since they have already been processed. If the criteria in a 738 * Match block is met, activep is set and the subsequent directives 739 * processed and actioned until EOF or another Match block unsets it. Any 740 * options set are copied into the main server config. 741 * 742 * Potential additions/improvements: 743 * - Add Match support for pre-kex directives, eg. Ciphers. 744 * 745 * - Add a Tag directive (idea from David Leonard) ala pf, eg: 746 * Match Address 192.168.0.* 747 * Tag trusted 748 * Match Group wheel 749 * Tag trusted 750 * Match Tag trusted 751 * AllowTcpForwarding yes 752 * GatewayPorts clientspecified 753 * [...] 754 * 755 * - Add a PermittedChannelRequests directive 756 * Match Group shell 757 * PermittedChannelRequests session,forwarded-tcpip 758 */ 759 760static int 761match_cfg_line_group(const char *grps, int line, const char *user) 762{ 763 int result = 0; 764 struct passwd *pw; 765 766 if (user == NULL) 767 goto out; 768 769 if ((pw = getpwnam(user)) == NULL) { 770 debug("Can't match group at line %d because user %.100s does " 771 "not exist", line, user); 772 } else if (ga_init(pw->pw_name, pw->pw_gid) == 0) { 773 debug("Can't Match group because user %.100s not in any group " 774 "at line %d", user, line); 775 } else if (ga_match_pattern_list(grps) != 1) { 776 debug("user %.100s does not match group list %.100s at line %d", 777 user, grps, line); 778 } else { 779 debug("user %.100s matched group list %.100s at line %d", user, 780 grps, line); 781 result = 1; 782 } 783out: 784 ga_free(); 785 return result; 786} 787 788/* 789 * All of the attributes on a single Match line are ANDed together, so we need 790 * to check every attribute and set the result to zero if any attribute does 791 * not match. 792 */ 793static int 794match_cfg_line(char **condition, int line, struct connection_info *ci) 795{ 796 int result = 1, attributes = 0, port; 797 char *arg, *attrib, *cp = *condition; 798 799 if (ci == NULL) 800 debug3("checking syntax for 'Match %s'", cp); 801 else 802 debug3("checking match for '%s' user %s host %s addr %s " 803 "laddr %s lport %d", cp, ci->user ? ci->user : "(null)", 804 ci->host ? ci->host : "(null)", 805 ci->address ? ci->address : "(null)", 806 ci->laddress ? ci->laddress : "(null)", ci->lport); 807 808 while ((attrib = strdelim(&cp)) && *attrib != '\0') { 809 attributes++; 810 if (strcasecmp(attrib, "all") == 0) { 811 if (attributes != 1 || 812 ((arg = strdelim(&cp)) != NULL && *arg != '\0')) { 813 error("'all' cannot be combined with other " 814 "Match attributes"); 815 return -1; 816 } 817 *condition = cp; 818 return 1; 819 } 820 if ((arg = strdelim(&cp)) == NULL || *arg == '\0') { 821 error("Missing Match criteria for %s", attrib); 822 return -1; 823 } 824 if (strcasecmp(attrib, "user") == 0) { 825 if (ci == NULL || ci->user == NULL) { 826 result = 0; 827 continue; 828 } 829 if (match_pattern_list(ci->user, arg, 0) != 1) 830 result = 0; 831 else 832 debug("user %.100s matched 'User %.100s' at " 833 "line %d", ci->user, arg, line); 834 } else if (strcasecmp(attrib, "group") == 0) { 835 if (ci == NULL || ci->user == NULL) { 836 result = 0; 837 continue; 838 } 839 switch (match_cfg_line_group(arg, line, ci->user)) { 840 case -1: 841 return -1; 842 case 0: 843 result = 0; 844 } 845 } else if (strcasecmp(attrib, "host") == 0) { 846 if (ci == NULL || ci->host == NULL) { 847 result = 0; 848 continue; 849 } 850 if (match_hostname(ci->host, arg) != 1) 851 result = 0; 852 else 853 debug("connection from %.100s matched 'Host " 854 "%.100s' at line %d", ci->host, arg, line); 855 } else if (strcasecmp(attrib, "address") == 0) { 856 if (ci == NULL || ci->address == NULL) { 857 result = 0; 858 continue; 859 } 860 switch (addr_match_list(ci->address, arg)) { 861 case 1: 862 debug("connection from %.100s matched 'Address " 863 "%.100s' at line %d", ci->address, arg, line); 864 break; 865 case 0: 866 case -1: 867 result = 0; 868 break; 869 case -2: 870 return -1; 871 } 872 } else if (strcasecmp(attrib, "localaddress") == 0){ 873 if (ci == NULL || ci->laddress == NULL) { 874 result = 0; 875 continue; 876 } 877 switch (addr_match_list(ci->laddress, arg)) { 878 case 1: 879 debug("connection from %.100s matched " 880 "'LocalAddress %.100s' at line %d", 881 ci->laddress, arg, line); 882 break; 883 case 0: 884 case -1: 885 result = 0; 886 break; 887 case -2: 888 return -1; 889 } 890 } else if (strcasecmp(attrib, "localport") == 0) { 891 if ((port = a2port(arg)) == -1) { 892 error("Invalid LocalPort '%s' on Match line", 893 arg); 894 return -1; 895 } 896 if (ci == NULL || ci->lport == 0) { 897 result = 0; 898 continue; 899 } 900 /* TODO support port lists */ 901 if (port == ci->lport) 902 debug("connection from %.100s matched " 903 "'LocalPort %d' at line %d", 904 ci->laddress, port, line); 905 else 906 result = 0; 907 } else { 908 error("Unsupported Match attribute %s", attrib); 909 return -1; 910 } 911 } 912 if (attributes == 0) { 913 error("One or more attributes required for Match"); 914 return -1; 915 } 916 if (ci != NULL) 917 debug3("match %sfound", result ? "" : "not "); 918 *condition = cp; 919 return result; 920} 921 922#define WHITESPACE " \t\r\n" 923 924/* Multistate option parsing */ 925struct multistate { 926 char *key; 927 int value; 928}; 929static const struct multistate multistate_addressfamily[] = { 930 { "inet", AF_INET }, 931 { "inet6", AF_INET6 }, 932 { "any", AF_UNSPEC }, 933 { NULL, -1 } 934}; 935static const struct multistate multistate_permitrootlogin[] = { 936 { "without-password", PERMIT_NO_PASSWD }, 937 { "prohibit-password", PERMIT_NO_PASSWD }, 938 { "forced-commands-only", PERMIT_FORCED_ONLY }, 939 { "yes", PERMIT_YES }, 940 { "no", PERMIT_NO }, 941 { NULL, -1 } 942}; 943static const struct multistate multistate_compression[] = { 944 { "yes", COMP_DELAYED }, 945 { "delayed", COMP_DELAYED }, 946 { "no", COMP_NONE }, 947 { NULL, -1 } 948}; 949static const struct multistate multistate_gatewayports[] = { 950 { "clientspecified", 2 }, 951 { "yes", 1 }, 952 { "no", 0 }, 953 { NULL, -1 } 954}; 955static const struct multistate multistate_privsep[] = { 956 { "yes", PRIVSEP_NOSANDBOX }, 957 { "sandbox", PRIVSEP_ON }, 958 { "nosandbox", PRIVSEP_NOSANDBOX }, 959 { "no", PRIVSEP_OFF }, 960 { NULL, -1 } 961}; 962static const struct multistate multistate_tcpfwd[] = { 963 { "yes", FORWARD_ALLOW }, 964 { "all", FORWARD_ALLOW }, 965 { "no", FORWARD_DENY }, 966 { "remote", FORWARD_REMOTE }, 967 { "local", FORWARD_LOCAL }, 968 { NULL, -1 } 969}; 970 971int 972process_server_config_line(ServerOptions *options, char *line, 973 const char *filename, int linenum, int *activep, 974 struct connection_info *connectinfo) 975{ 976 char *cp, **charptr, *arg, *p; 977 int cmdline = 0, *intptr, value, value2, n, port; 978 SyslogFacility *log_facility_ptr; 979 LogLevel *log_level_ptr; 980 ServerOpCodes opcode; 981 u_int i, flags = 0; 982 size_t len; 983 long long val64; 984 const struct multistate *multistate_ptr; 985 986 /* Strip trailing whitespace. Allow \f (form feed) at EOL only */ 987 if ((len = strlen(line)) == 0) 988 return 0; 989 for (len--; len > 0; len--) { 990 if (strchr(WHITESPACE "\f", line[len]) == NULL) 991 break; 992 line[len] = '\0'; 993 } 994 995 cp = line; 996 if ((arg = strdelim(&cp)) == NULL) 997 return 0; 998 /* Ignore leading whitespace */ 999 if (*arg == '\0') 1000 arg = strdelim(&cp); 1001 if (!arg || !*arg || *arg == '#') 1002 return 0; 1003 intptr = NULL; 1004 charptr = NULL; 1005 opcode = parse_token(arg, filename, linenum, &flags); 1006 1007 if (activep == NULL) { /* We are processing a command line directive */ 1008 cmdline = 1; 1009 activep = &cmdline; 1010 } 1011 if (*activep && opcode != sMatch) 1012 debug3("%s:%d setting %s %s", filename, linenum, arg, cp); 1013 if (*activep == 0 && !(flags & SSHCFG_MATCH)) { 1014 if (connectinfo == NULL) { 1015 fatal("%s line %d: Directive '%s' is not allowed " 1016 "within a Match block", filename, linenum, arg); 1017 } else { /* this is a directive we have already processed */ 1018 while (arg) 1019 arg = strdelim(&cp); 1020 return 0; 1021 } 1022 } 1023 1024 switch (opcode) { 1025 /* Portable-specific options */ 1026 case sUsePAM: 1027 intptr = &options->use_pam; 1028 goto parse_flag; 1029 1030 /* Standard Options */ 1031 case sBadOption: 1032 return -1; 1033 case sPort: 1034 /* ignore ports from configfile if cmdline specifies ports */ 1035 if (options->ports_from_cmdline) 1036 return 0; 1037 if (options->num_ports >= MAX_PORTS) 1038 fatal("%s line %d: too many ports.", 1039 filename, linenum); 1040 arg = strdelim(&cp); 1041 if (!arg || *arg == '\0') 1042 fatal("%s line %d: missing port number.", 1043 filename, linenum); 1044 options->ports[options->num_ports++] = a2port(arg); 1045 if (options->ports[options->num_ports-1] <= 0) 1046 fatal("%s line %d: Badly formatted port number.", 1047 filename, linenum); 1048 break; 1049 1050 case sLoginGraceTime: 1051 intptr = &options->login_grace_time; 1052 parse_time: 1053 arg = strdelim(&cp); 1054 if (!arg || *arg == '\0') 1055 fatal("%s line %d: missing time value.", 1056 filename, linenum); 1057 if ((value = convtime(arg)) == -1) 1058 fatal("%s line %d: invalid time value.", 1059 filename, linenum); 1060 if (*activep && *intptr == -1) 1061 *intptr = value; 1062 break; 1063 1064 case sListenAddress: 1065 arg = strdelim(&cp); 1066 if (arg == NULL || *arg == '\0') 1067 fatal("%s line %d: missing address", 1068 filename, linenum); 1069 /* check for bare IPv6 address: no "[]" and 2 or more ":" */ 1070 if (strchr(arg, '[') == NULL && (p = strchr(arg, ':')) != NULL 1071 && strchr(p+1, ':') != NULL) { 1072 queue_listen_addr(options, arg, 0); 1073 break; 1074 } 1075 p = hpdelim(&arg); 1076 if (p == NULL) 1077 fatal("%s line %d: bad address:port usage", 1078 filename, linenum); 1079 p = cleanhostname(p); 1080 if (arg == NULL) 1081 port = 0; 1082 else if ((port = a2port(arg)) <= 0) 1083 fatal("%s line %d: bad port number", filename, linenum); 1084 1085 queue_listen_addr(options, p, port); 1086 1087 break; 1088 1089 case sAddressFamily: 1090 intptr = &options->address_family; 1091 multistate_ptr = multistate_addressfamily; 1092 parse_multistate: 1093 arg = strdelim(&cp); 1094 if (!arg || *arg == '\0') 1095 fatal("%s line %d: missing argument.", 1096 filename, linenum); 1097 value = -1; 1098 for (i = 0; multistate_ptr[i].key != NULL; i++) { 1099 if (strcasecmp(arg, multistate_ptr[i].key) == 0) { 1100 value = multistate_ptr[i].value; 1101 break; 1102 } 1103 } 1104 if (value == -1) 1105 fatal("%s line %d: unsupported option \"%s\".", 1106 filename, linenum, arg); 1107 if (*activep && *intptr == -1) 1108 *intptr = value; 1109 break; 1110 1111 case sHostKeyFile: 1112 intptr = &options->num_host_key_files; 1113 if (*intptr >= MAX_HOSTKEYS) 1114 fatal("%s line %d: too many host keys specified (max %d).", 1115 filename, linenum, MAX_HOSTKEYS); 1116 charptr = &options->host_key_files[*intptr]; 1117 parse_filename: 1118 arg = strdelim(&cp); 1119 if (!arg || *arg == '\0') 1120 fatal("%s line %d: missing file name.", 1121 filename, linenum); 1122 if (*activep && *charptr == NULL) { 1123 *charptr = derelativise_path(arg); 1124 /* increase optional counter */ 1125 if (intptr != NULL) 1126 *intptr = *intptr + 1; 1127 } 1128 break; 1129 1130 case sHostKeyAgent: 1131 charptr = &options->host_key_agent; 1132 arg = strdelim(&cp); 1133 if (!arg || *arg == '\0') 1134 fatal("%s line %d: missing socket name.", 1135 filename, linenum); 1136 if (*activep && *charptr == NULL) 1137 *charptr = !strcmp(arg, SSH_AUTHSOCKET_ENV_NAME) ? 1138 xstrdup(arg) : derelativise_path(arg); 1139 break; 1140 1141 case sHostCertificate: 1142 intptr = &options->num_host_cert_files; 1143 if (*intptr >= MAX_HOSTKEYS) 1144 fatal("%s line %d: too many host certificates " 1145 "specified (max %d).", filename, linenum, 1146 MAX_HOSTCERTS); 1147 charptr = &options->host_cert_files[*intptr]; 1148 goto parse_filename; 1149 1150 case sPidFile: 1151 charptr = &options->pid_file; 1152 goto parse_filename; 1153 1154 case sPermitRootLogin: 1155 intptr = &options->permit_root_login; 1156 multistate_ptr = multistate_permitrootlogin; 1157 goto parse_multistate; 1158 1159 case sIgnoreRhosts: 1160 intptr = &options->ignore_rhosts; 1161 parse_flag: 1162 arg = strdelim(&cp); 1163 if (!arg || *arg == '\0') 1164 fatal("%s line %d: missing yes/no argument.", 1165 filename, linenum); 1166 value = 0; /* silence compiler */ 1167 if (strcmp(arg, "yes") == 0) 1168 value = 1; 1169 else if (strcmp(arg, "no") == 0) 1170 value = 0; 1171 else 1172 fatal("%s line %d: Bad yes/no argument: %s", 1173 filename, linenum, arg); 1174 if (*activep && *intptr == -1) 1175 *intptr = value; 1176 break; 1177 1178 case sIgnoreUserKnownHosts: 1179 intptr = &options->ignore_user_known_hosts; 1180 goto parse_flag; 1181 1182 case sHostbasedAuthentication: 1183 intptr = &options->hostbased_authentication; 1184 goto parse_flag; 1185 1186 case sHostbasedUsesNameFromPacketOnly: 1187 intptr = &options->hostbased_uses_name_from_packet_only; 1188 goto parse_flag; 1189 1190 case sHostbasedAcceptedKeyTypes: 1191 charptr = &options->hostbased_key_types; 1192 parse_keytypes: 1193 arg = strdelim(&cp); 1194 if (!arg || *arg == '\0') 1195 fatal("%s line %d: Missing argument.", 1196 filename, linenum); 1197 if (*arg != '-' && 1198 !sshkey_names_valid2(*arg == '+' ? arg + 1 : arg, 1)) 1199 fatal("%s line %d: Bad key types '%s'.", 1200 filename, linenum, arg ? arg : "<NONE>"); 1201 if (*activep && *charptr == NULL) 1202 *charptr = xstrdup(arg); 1203 break; 1204 1205 case sHostKeyAlgorithms: 1206 charptr = &options->hostkeyalgorithms; 1207 goto parse_keytypes; 1208 1209 case sPubkeyAuthentication: 1210 intptr = &options->pubkey_authentication; 1211 goto parse_flag; 1212 1213 case sPubkeyAcceptedKeyTypes: 1214 charptr = &options->pubkey_key_types; 1215 goto parse_keytypes; 1216 1217 case sKerberosAuthentication: 1218 intptr = &options->kerberos_authentication; 1219 goto parse_flag; 1220 1221 case sKerberosOrLocalPasswd: 1222 intptr = &options->kerberos_or_local_passwd; 1223 goto parse_flag; 1224 1225 case sKerberosTicketCleanup: 1226 intptr = &options->kerberos_ticket_cleanup; 1227 goto parse_flag; 1228 1229 case sKerberosGetAFSToken: 1230 intptr = &options->kerberos_get_afs_token; 1231 goto parse_flag; 1232 1233 case sGssAuthentication: 1234 intptr = &options->gss_authentication; 1235 goto parse_flag; 1236 1237 case sGssCleanupCreds: 1238 intptr = &options->gss_cleanup_creds; 1239 goto parse_flag; 1240 1241 case sGssStrictAcceptor: 1242 intptr = &options->gss_strict_acceptor; 1243 goto parse_flag; 1244 1245 case sPasswordAuthentication: 1246 intptr = &options->password_authentication; 1247 goto parse_flag; 1248 1249 case sKbdInteractiveAuthentication: 1250 intptr = &options->kbd_interactive_authentication; 1251 goto parse_flag; 1252 1253 case sChallengeResponseAuthentication: 1254 intptr = &options->challenge_response_authentication; 1255 goto parse_flag; 1256 1257 case sPrintMotd: 1258 intptr = &options->print_motd; 1259 goto parse_flag; 1260 1261 case sPrintLastLog: 1262 intptr = &options->print_lastlog; 1263 goto parse_flag; 1264 1265 case sX11Forwarding: 1266 intptr = &options->x11_forwarding; 1267 goto parse_flag; 1268 1269 case sX11DisplayOffset: 1270 intptr = &options->x11_display_offset; 1271 parse_int: 1272 arg = strdelim(&cp); 1273 if (!arg || *arg == '\0') 1274 fatal("%s line %d: missing integer value.", 1275 filename, linenum); 1276 value = atoi(arg); 1277 if (*activep && *intptr == -1) 1278 *intptr = value; 1279 break; 1280 1281 case sX11UseLocalhost: 1282 intptr = &options->x11_use_localhost; 1283 goto parse_flag; 1284 1285 case sXAuthLocation: 1286 charptr = &options->xauth_location; 1287 goto parse_filename; 1288 1289 case sPermitTTY: 1290 intptr = &options->permit_tty; 1291 goto parse_flag; 1292 1293 case sPermitUserRC: 1294 intptr = &options->permit_user_rc; 1295 goto parse_flag; 1296 1297 case sStrictModes: 1298 intptr = &options->strict_modes; 1299 goto parse_flag; 1300 1301 case sTCPKeepAlive: 1302 intptr = &options->tcp_keep_alive; 1303 goto parse_flag; 1304 1305 case sEmptyPasswd: 1306 intptr = &options->permit_empty_passwd; 1307 goto parse_flag; 1308 1309 case sPermitUserEnvironment: 1310 intptr = &options->permit_user_env; 1311 goto parse_flag; 1312 1313 case sCompression: 1314 intptr = &options->compression; 1315 multistate_ptr = multistate_compression; 1316 goto parse_multistate; 1317 1318 case sRekeyLimit: 1319 arg = strdelim(&cp); 1320 if (!arg || *arg == '\0') 1321 fatal("%.200s line %d: Missing argument.", filename, 1322 linenum); 1323 if (strcmp(arg, "default") == 0) { 1324 val64 = 0; 1325 } else { 1326 if (scan_scaled(arg, &val64) == -1) 1327 fatal("%.200s line %d: Bad number '%s': %s", 1328 filename, linenum, arg, strerror(errno)); 1329 if (val64 != 0 && val64 < 16) 1330 fatal("%.200s line %d: RekeyLimit too small", 1331 filename, linenum); 1332 } 1333 if (*activep && options->rekey_limit == -1) 1334 options->rekey_limit = val64; 1335 if (cp != NULL) { /* optional rekey interval present */ 1336 if (strcmp(cp, "none") == 0) { 1337 (void)strdelim(&cp); /* discard */ 1338 break; 1339 } 1340 intptr = &options->rekey_interval; 1341 goto parse_time; 1342 } 1343 break; 1344 1345 case sGatewayPorts: 1346 intptr = &options->fwd_opts.gateway_ports; 1347 multistate_ptr = multistate_gatewayports; 1348 goto parse_multistate; 1349 1350 case sUseDNS: 1351 intptr = &options->use_dns; 1352 goto parse_flag; 1353 1354 case sLogFacility: 1355 log_facility_ptr = &options->log_facility; 1356 arg = strdelim(&cp); 1357 value = log_facility_number(arg); 1358 if (value == SYSLOG_FACILITY_NOT_SET) 1359 fatal("%.200s line %d: unsupported log facility '%s'", 1360 filename, linenum, arg ? arg : "<NONE>"); 1361 if (*log_facility_ptr == -1) 1362 *log_facility_ptr = (SyslogFacility) value; 1363 break; 1364 1365 case sLogLevel: 1366 log_level_ptr = &options->log_level; 1367 arg = strdelim(&cp); 1368 value = log_level_number(arg); 1369 if (value == SYSLOG_LEVEL_NOT_SET) 1370 fatal("%.200s line %d: unsupported log level '%s'", 1371 filename, linenum, arg ? arg : "<NONE>"); 1372 if (*log_level_ptr == -1) 1373 *log_level_ptr = (LogLevel) value; 1374 break; 1375 1376 case sAllowTcpForwarding: 1377 intptr = &options->allow_tcp_forwarding; 1378 multistate_ptr = multistate_tcpfwd; 1379 goto parse_multistate; 1380 1381 case sAllowStreamLocalForwarding: 1382 intptr = &options->allow_streamlocal_forwarding; 1383 multistate_ptr = multistate_tcpfwd; 1384 goto parse_multistate; 1385 1386 case sAllowAgentForwarding: 1387 intptr = &options->allow_agent_forwarding; 1388 goto parse_flag; 1389 1390 case sDisableForwarding: 1391 intptr = &options->disable_forwarding; 1392 goto parse_flag; 1393 1394 case sAllowUsers: 1395 while ((arg = strdelim(&cp)) && *arg != '\0') { 1396 if (options->num_allow_users >= MAX_ALLOW_USERS) 1397 fatal("%s line %d: too many allow users.", 1398 filename, linenum); 1399 if (match_user(NULL, NULL, NULL, arg) == -1) 1400 fatal("%s line %d: invalid AllowUsers pattern: " 1401 "\"%.100s\"", filename, linenum, arg); 1402 if (!*activep) 1403 continue; 1404 options->allow_users[options->num_allow_users++] = 1405 xstrdup(arg); 1406 } 1407 break; 1408 1409 case sDenyUsers: 1410 while ((arg = strdelim(&cp)) && *arg != '\0') { 1411 if (options->num_deny_users >= MAX_DENY_USERS) 1412 fatal("%s line %d: too many deny users.", 1413 filename, linenum); 1414 if (match_user(NULL, NULL, NULL, arg) == -1) 1415 fatal("%s line %d: invalid DenyUsers pattern: " 1416 "\"%.100s\"", filename, linenum, arg); 1417 if (!*activep) 1418 continue; 1419 options->deny_users[options->num_deny_users++] = 1420 xstrdup(arg); 1421 } 1422 break; 1423 1424 case sAllowGroups: 1425 while ((arg = strdelim(&cp)) && *arg != '\0') { 1426 if (options->num_allow_groups >= MAX_ALLOW_GROUPS) 1427 fatal("%s line %d: too many allow groups.", 1428 filename, linenum); 1429 if (!*activep) 1430 continue; 1431 options->allow_groups[options->num_allow_groups++] = 1432 xstrdup(arg); 1433 } 1434 break; 1435 1436 case sDenyGroups: 1437 while ((arg = strdelim(&cp)) && *arg != '\0') { 1438 if (options->num_deny_groups >= MAX_DENY_GROUPS) 1439 fatal("%s line %d: too many deny groups.", 1440 filename, linenum); 1441 if (!*activep) 1442 continue; 1443 options->deny_groups[options->num_deny_groups++] = 1444 xstrdup(arg); 1445 } 1446 break; 1447 1448 case sCiphers: 1449 arg = strdelim(&cp); 1450 if (!arg || *arg == '\0') 1451 fatal("%s line %d: Missing argument.", filename, linenum); 1452 if (*arg != '-' && !ciphers_valid(*arg == '+' ? arg + 1 : arg)) 1453 fatal("%s line %d: Bad SSH2 cipher spec '%s'.", 1454 filename, linenum, arg ? arg : "<NONE>"); 1455 if (options->ciphers == NULL) 1456 options->ciphers = xstrdup(arg); 1457 break; 1458 1459 case sMacs: 1460 arg = strdelim(&cp); 1461 if (!arg || *arg == '\0') 1462 fatal("%s line %d: Missing argument.", filename, linenum); 1463 if (*arg != '-' && !mac_valid(*arg == '+' ? arg + 1 : arg)) 1464 fatal("%s line %d: Bad SSH2 mac spec '%s'.", 1465 filename, linenum, arg ? arg : "<NONE>"); 1466 if (options->macs == NULL) 1467 options->macs = xstrdup(arg); 1468 break; 1469 1470 case sKexAlgorithms: 1471 arg = strdelim(&cp); 1472 if (!arg || *arg == '\0') 1473 fatal("%s line %d: Missing argument.", 1474 filename, linenum); 1475 if (*arg != '-' && 1476 !kex_names_valid(*arg == '+' ? arg + 1 : arg)) 1477 fatal("%s line %d: Bad SSH2 KexAlgorithms '%s'.", 1478 filename, linenum, arg ? arg : "<NONE>"); 1479 if (options->kex_algorithms == NULL) 1480 options->kex_algorithms = xstrdup(arg); 1481 break; 1482 1483 case sSubsystem: 1484 if (options->num_subsystems >= MAX_SUBSYSTEMS) { 1485 fatal("%s line %d: too many subsystems defined.", 1486 filename, linenum); 1487 } 1488 arg = strdelim(&cp); 1489 if (!arg || *arg == '\0') 1490 fatal("%s line %d: Missing subsystem name.", 1491 filename, linenum); 1492 if (!*activep) { 1493 arg = strdelim(&cp); 1494 break; 1495 } 1496 for (i = 0; i < options->num_subsystems; i++) 1497 if (strcmp(arg, options->subsystem_name[i]) == 0) 1498 fatal("%s line %d: Subsystem '%s' already defined.", 1499 filename, linenum, arg); 1500 options->subsystem_name[options->num_subsystems] = xstrdup(arg); 1501 arg = strdelim(&cp); 1502 if (!arg || *arg == '\0') 1503 fatal("%s line %d: Missing subsystem command.", 1504 filename, linenum); 1505 options->subsystem_command[options->num_subsystems] = xstrdup(arg); 1506 1507 /* Collect arguments (separate to executable) */ 1508 p = xstrdup(arg); 1509 len = strlen(p) + 1; 1510 while ((arg = strdelim(&cp)) != NULL && *arg != '\0') { 1511 len += 1 + strlen(arg); 1512 p = xreallocarray(p, 1, len); 1513 strlcat(p, " ", len); 1514 strlcat(p, arg, len); 1515 } 1516 options->subsystem_args[options->num_subsystems] = p; 1517 options->num_subsystems++; 1518 break; 1519 1520 case sMaxStartups: 1521 arg = strdelim(&cp); 1522 if (!arg || *arg == '\0') 1523 fatal("%s line %d: Missing MaxStartups spec.", 1524 filename, linenum); 1525 if ((n = sscanf(arg, "%d:%d:%d", 1526 &options->max_startups_begin, 1527 &options->max_startups_rate, 1528 &options->max_startups)) == 3) { 1529 if (options->max_startups_begin > 1530 options->max_startups || 1531 options->max_startups_rate > 100 || 1532 options->max_startups_rate < 1) 1533 fatal("%s line %d: Illegal MaxStartups spec.", 1534 filename, linenum); 1535 } else if (n != 1) 1536 fatal("%s line %d: Illegal MaxStartups spec.", 1537 filename, linenum); 1538 else 1539 options->max_startups = options->max_startups_begin; 1540 break; 1541 1542 case sMaxAuthTries: 1543 intptr = &options->max_authtries; 1544 goto parse_int; 1545 1546 case sMaxSessions: 1547 intptr = &options->max_sessions; 1548 goto parse_int; 1549 1550 case sBanner: 1551 charptr = &options->banner; 1552 goto parse_filename; 1553 1554 /* 1555 * These options can contain %X options expanded at 1556 * connect time, so that you can specify paths like: 1557 * 1558 * AuthorizedKeysFile /etc/ssh_keys/%u 1559 */ 1560 case sAuthorizedKeysFile: 1561 if (*activep && options->num_authkeys_files == 0) { 1562 while ((arg = strdelim(&cp)) && *arg != '\0') { 1563 if (options->num_authkeys_files >= 1564 MAX_AUTHKEYS_FILES) 1565 fatal("%s line %d: " 1566 "too many authorized keys files.", 1567 filename, linenum); 1568 options->authorized_keys_files[ 1569 options->num_authkeys_files++] = 1570 tilde_expand_filename(arg, getuid()); 1571 } 1572 } 1573 return 0; 1574 1575 case sAuthorizedPrincipalsFile: 1576 charptr = &options->authorized_principals_file; 1577 arg = strdelim(&cp); 1578 if (!arg || *arg == '\0') 1579 fatal("%s line %d: missing file name.", 1580 filename, linenum); 1581 if (*activep && *charptr == NULL) { 1582 *charptr = tilde_expand_filename(arg, getuid()); 1583 /* increase optional counter */ 1584 if (intptr != NULL) 1585 *intptr = *intptr + 1; 1586 } 1587 break; 1588 1589 case sClientAliveInterval: 1590 intptr = &options->client_alive_interval; 1591 goto parse_time; 1592 1593 case sClientAliveCountMax: 1594 intptr = &options->client_alive_count_max; 1595 goto parse_int; 1596 1597 case sAcceptEnv: 1598 while ((arg = strdelim(&cp)) && *arg != '\0') { 1599 if (strchr(arg, '=') != NULL) 1600 fatal("%s line %d: Invalid environment name.", 1601 filename, linenum); 1602 if (options->num_accept_env >= MAX_ACCEPT_ENV) 1603 fatal("%s line %d: too many allow env.", 1604 filename, linenum); 1605 if (!*activep) 1606 continue; 1607 options->accept_env[options->num_accept_env++] = 1608 xstrdup(arg); 1609 } 1610 break; 1611 1612 case sPermitTunnel: 1613 intptr = &options->permit_tun; 1614 arg = strdelim(&cp); 1615 if (!arg || *arg == '\0') 1616 fatal("%s line %d: Missing yes/point-to-point/" 1617 "ethernet/no argument.", filename, linenum); 1618 value = -1; 1619 for (i = 0; tunmode_desc[i].val != -1; i++) 1620 if (strcmp(tunmode_desc[i].text, arg) == 0) { 1621 value = tunmode_desc[i].val; 1622 break; 1623 } 1624 if (value == -1) 1625 fatal("%s line %d: Bad yes/point-to-point/ethernet/" 1626 "no argument: %s", filename, linenum, arg); 1627 if (*activep && *intptr == -1) 1628 *intptr = value; 1629 break; 1630 1631 case sMatch: 1632 if (cmdline) 1633 fatal("Match directive not supported as a command-line " 1634 "option"); 1635 value = match_cfg_line(&cp, linenum, connectinfo); 1636 if (value < 0) 1637 fatal("%s line %d: Bad Match condition", filename, 1638 linenum); 1639 *activep = value; 1640 break; 1641 1642 case sPermitOpen: 1643 arg = strdelim(&cp); 1644 if (!arg || *arg == '\0') 1645 fatal("%s line %d: missing PermitOpen specification", 1646 filename, linenum); 1647 n = options->num_permitted_opens; /* modified later */ 1648 if (strcmp(arg, "any") == 0) { 1649 if (*activep && n == -1) { 1650 channel_clear_adm_permitted_opens(); 1651 options->num_permitted_opens = 0; 1652 } 1653 break; 1654 } 1655 if (strcmp(arg, "none") == 0) { 1656 if (*activep && n == -1) { 1657 options->num_permitted_opens = 1; 1658 channel_disable_adm_local_opens(); 1659 } 1660 break; 1661 } 1662 if (*activep && n == -1) 1663 channel_clear_adm_permitted_opens(); 1664 for (; arg != NULL && *arg != '\0'; arg = strdelim(&cp)) { 1665 p = hpdelim(&arg); 1666 if (p == NULL) 1667 fatal("%s line %d: missing host in PermitOpen", 1668 filename, linenum); 1669 p = cleanhostname(p); 1670 if (arg == NULL || ((port = permitopen_port(arg)) < 0)) 1671 fatal("%s line %d: bad port number in " 1672 "PermitOpen", filename, linenum); 1673 if (*activep && n == -1) 1674 options->num_permitted_opens = 1675 channel_add_adm_permitted_opens(p, port); 1676 } 1677 break; 1678 1679 case sForceCommand: 1680 if (cp == NULL || *cp == '\0') 1681 fatal("%.200s line %d: Missing argument.", filename, 1682 linenum); 1683 len = strspn(cp, WHITESPACE); 1684 if (*activep && options->adm_forced_command == NULL) 1685 options->adm_forced_command = xstrdup(cp + len); 1686 return 0; 1687 1688 case sChrootDirectory: 1689 charptr = &options->chroot_directory; 1690 1691 arg = strdelim(&cp); 1692 if (!arg || *arg == '\0') 1693 fatal("%s line %d: missing file name.", 1694 filename, linenum); 1695 if (*activep && *charptr == NULL) 1696 *charptr = xstrdup(arg); 1697 break; 1698 1699 case sTrustedUserCAKeys: 1700 charptr = &options->trusted_user_ca_keys; 1701 goto parse_filename; 1702 1703 case sRevokedKeys: 1704 charptr = &options->revoked_keys_file; 1705 goto parse_filename; 1706 1707 case sIPQoS: 1708 arg = strdelim(&cp); 1709 if ((value = parse_ipqos(arg)) == -1) 1710 fatal("%s line %d: Bad IPQoS value: %s", 1711 filename, linenum, arg); 1712 arg = strdelim(&cp); 1713 if (arg == NULL) 1714 value2 = value; 1715 else if ((value2 = parse_ipqos(arg)) == -1) 1716 fatal("%s line %d: Bad IPQoS value: %s", 1717 filename, linenum, arg); 1718 if (*activep) { 1719 options->ip_qos_interactive = value; 1720 options->ip_qos_bulk = value2; 1721 } 1722 break; 1723 1724 case sVersionAddendum: 1725 if (cp == NULL || *cp == '\0') 1726 fatal("%.200s line %d: Missing argument.", filename, 1727 linenum); 1728 len = strspn(cp, WHITESPACE); 1729 if (*activep && options->version_addendum == NULL) { 1730 if (strcasecmp(cp + len, "none") == 0) 1731 options->version_addendum = xstrdup(""); 1732 else if (strchr(cp + len, '\r') != NULL) 1733 fatal("%.200s line %d: Invalid argument", 1734 filename, linenum); 1735 else 1736 options->version_addendum = xstrdup(cp + len); 1737 } 1738 return 0; 1739 1740 case sAuthorizedKeysCommand: 1741 if (cp == NULL) 1742 fatal("%.200s line %d: Missing argument.", filename, 1743 linenum); 1744 len = strspn(cp, WHITESPACE); 1745 if (*activep && options->authorized_keys_command == NULL) { 1746 if (cp[len] != '/' && strcasecmp(cp + len, "none") != 0) 1747 fatal("%.200s line %d: AuthorizedKeysCommand " 1748 "must be an absolute path", 1749 filename, linenum); 1750 options->authorized_keys_command = xstrdup(cp + len); 1751 } 1752 return 0; 1753 1754 case sAuthorizedKeysCommandUser: 1755 charptr = &options->authorized_keys_command_user; 1756 1757 arg = strdelim(&cp); 1758 if (!arg || *arg == '\0') 1759 fatal("%s line %d: missing AuthorizedKeysCommandUser " 1760 "argument.", filename, linenum); 1761 if (*activep && *charptr == NULL) 1762 *charptr = xstrdup(arg); 1763 break; 1764 1765 case sAuthorizedPrincipalsCommand: 1766 if (cp == NULL) 1767 fatal("%.200s line %d: Missing argument.", filename, 1768 linenum); 1769 len = strspn(cp, WHITESPACE); 1770 if (*activep && 1771 options->authorized_principals_command == NULL) { 1772 if (cp[len] != '/' && strcasecmp(cp + len, "none") != 0) 1773 fatal("%.200s line %d: " 1774 "AuthorizedPrincipalsCommand must be " 1775 "an absolute path", filename, linenum); 1776 options->authorized_principals_command = 1777 xstrdup(cp + len); 1778 } 1779 return 0; 1780 1781 case sAuthorizedPrincipalsCommandUser: 1782 charptr = &options->authorized_principals_command_user; 1783 1784 arg = strdelim(&cp); 1785 if (!arg || *arg == '\0') 1786 fatal("%s line %d: missing " 1787 "AuthorizedPrincipalsCommandUser argument.", 1788 filename, linenum); 1789 if (*activep && *charptr == NULL) 1790 *charptr = xstrdup(arg); 1791 break; 1792 1793 case sAuthenticationMethods: 1794 if (options->num_auth_methods == 0) { 1795 value = 0; /* seen "any" pseudo-method */ 1796 value2 = 0; /* sucessfully parsed any method */ 1797 while ((arg = strdelim(&cp)) && *arg != '\0') { 1798 if (options->num_auth_methods >= 1799 MAX_AUTH_METHODS) 1800 fatal("%s line %d: " 1801 "too many authentication methods.", 1802 filename, linenum); 1803 if (strcmp(arg, "any") == 0) { 1804 if (options->num_auth_methods > 0) { 1805 fatal("%s line %d: \"any\" " 1806 "must appear alone in " 1807 "AuthenticationMethods", 1808 filename, linenum); 1809 } 1810 value = 1; 1811 } else if (value) { 1812 fatal("%s line %d: \"any\" must appear " 1813 "alone in AuthenticationMethods", 1814 filename, linenum); 1815 } else if (auth2_methods_valid(arg, 0) != 0) { 1816 fatal("%s line %d: invalid " 1817 "authentication method list.", 1818 filename, linenum); 1819 } 1820 value2 = 1; 1821 if (!*activep) 1822 continue; 1823 options->auth_methods[ 1824 options->num_auth_methods++] = xstrdup(arg); 1825 } 1826 if (value2 == 0) { 1827 fatal("%s line %d: no AuthenticationMethods " 1828 "specified", filename, linenum); 1829 } 1830 } 1831 return 0; 1832 1833 case sStreamLocalBindMask: 1834 arg = strdelim(&cp); 1835 if (!arg || *arg == '\0') 1836 fatal("%s line %d: missing StreamLocalBindMask " 1837 "argument.", filename, linenum); 1838 /* Parse mode in octal format */ 1839 value = strtol(arg, &p, 8); 1840 if (arg == p || value < 0 || value > 0777) 1841 fatal("%s line %d: Bad mask.", filename, linenum); 1842 if (*activep) 1843 options->fwd_opts.streamlocal_bind_mask = (mode_t)value; 1844 break; 1845 1846 case sStreamLocalBindUnlink: 1847 intptr = &options->fwd_opts.streamlocal_bind_unlink; 1848 goto parse_flag; 1849 1850 case sFingerprintHash: 1851 arg = strdelim(&cp); 1852 if (!arg || *arg == '\0') 1853 fatal("%.200s line %d: Missing argument.", 1854 filename, linenum); 1855 if ((value = ssh_digest_alg_by_name(arg)) == -1) 1856 fatal("%.200s line %d: Invalid hash algorithm \"%s\".", 1857 filename, linenum, arg); 1858 if (*activep) 1859 options->fingerprint_hash = value; 1860 break; 1861 1862 case sUseBlacklist: 1863 intptr = &options->use_blacklist; 1864 goto parse_flag; 1865 1866 case sDeprecated: 1867 case sIgnore: 1868 case sUnsupported: 1869 do_log2(opcode == sIgnore ? 1870 SYSLOG_LEVEL_DEBUG2 : SYSLOG_LEVEL_INFO, 1871 "%s line %d: %s option %s", filename, linenum, 1872 opcode == sUnsupported ? "Unsupported" : "Deprecated", arg); 1873 while (arg) 1874 arg = strdelim(&cp); 1875 break; 1876 1877 default: 1878 fatal("%s line %d: Missing handler for opcode %s (%d)", 1879 filename, linenum, arg, opcode); 1880 } 1881 if ((arg = strdelim(&cp)) != NULL && *arg != '\0') 1882 fatal("%s line %d: garbage at end of line; \"%.200s\".", 1883 filename, linenum, arg); 1884 return 0; 1885} 1886 1887/* Reads the server configuration file. */ 1888 1889void 1890load_server_config(const char *filename, Buffer *conf) 1891{ 1892 char line[4096], *cp; 1893 FILE *f; 1894 int lineno = 0; 1895 1896 debug2("%s: filename %s", __func__, filename); 1897 if ((f = fopen(filename, "r")) == NULL) { 1898 perror(filename); 1899 exit(1); 1900 } 1901 buffer_clear(conf); 1902 while (fgets(line, sizeof(line), f)) { 1903 lineno++; 1904 if (strlen(line) == sizeof(line) - 1) 1905 fatal("%s line %d too long", filename, lineno); 1906 /* 1907 * Trim out comments and strip whitespace 1908 * NB - preserve newlines, they are needed to reproduce 1909 * line numbers later for error messages 1910 */ 1911 if ((cp = strchr(line, '#')) != NULL) 1912 memcpy(cp, "\n", 2); 1913 cp = line + strspn(line, " \t\r"); 1914 1915 buffer_append(conf, cp, strlen(cp)); 1916 } 1917 buffer_append(conf, "\0", 1); 1918 fclose(f); 1919 debug2("%s: done config len = %d", __func__, buffer_len(conf)); 1920} 1921 1922void 1923parse_server_match_config(ServerOptions *options, 1924 struct connection_info *connectinfo) 1925{ 1926 ServerOptions mo; 1927 1928 initialize_server_options(&mo); 1929 parse_server_config(&mo, "reprocess config", &cfg, connectinfo); 1930 copy_set_server_options(options, &mo, 0); 1931} 1932 1933int parse_server_match_testspec(struct connection_info *ci, char *spec) 1934{ 1935 char *p; 1936 1937 while ((p = strsep(&spec, ",")) && *p != '\0') { 1938 if (strncmp(p, "addr=", 5) == 0) { 1939 ci->address = xstrdup(p + 5); 1940 } else if (strncmp(p, "host=", 5) == 0) { 1941 ci->host = xstrdup(p + 5); 1942 } else if (strncmp(p, "user=", 5) == 0) { 1943 ci->user = xstrdup(p + 5); 1944 } else if (strncmp(p, "laddr=", 6) == 0) { 1945 ci->laddress = xstrdup(p + 6); 1946 } else if (strncmp(p, "lport=", 6) == 0) { 1947 ci->lport = a2port(p + 6); 1948 if (ci->lport == -1) { 1949 fprintf(stderr, "Invalid port '%s' in test mode" 1950 " specification %s\n", p+6, p); 1951 return -1; 1952 } 1953 } else { 1954 fprintf(stderr, "Invalid test mode specification %s\n", 1955 p); 1956 return -1; 1957 } 1958 } 1959 return 0; 1960} 1961 1962/* 1963 * returns 1 for a complete spec, 0 for partial spec and -1 for an 1964 * empty spec. 1965 */ 1966int server_match_spec_complete(struct connection_info *ci) 1967{ 1968 if (ci->user && ci->host && ci->address) 1969 return 1; /* complete */ 1970 if (!ci->user && !ci->host && !ci->address) 1971 return -1; /* empty */ 1972 return 0; /* partial */ 1973} 1974 1975/* 1976 * Copy any supported values that are set. 1977 * 1978 * If the preauth flag is set, we do not bother copying the string or 1979 * array values that are not used pre-authentication, because any that we 1980 * do use must be explictly sent in mm_getpwnamallow(). 1981 */ 1982void 1983copy_set_server_options(ServerOptions *dst, ServerOptions *src, int preauth) 1984{ 1985#define M_CP_INTOPT(n) do {\ 1986 if (src->n != -1) \ 1987 dst->n = src->n; \ 1988} while (0) 1989 1990 M_CP_INTOPT(password_authentication); 1991 M_CP_INTOPT(gss_authentication); 1992 M_CP_INTOPT(pubkey_authentication); 1993 M_CP_INTOPT(kerberos_authentication); 1994 M_CP_INTOPT(hostbased_authentication); 1995 M_CP_INTOPT(hostbased_uses_name_from_packet_only); 1996 M_CP_INTOPT(kbd_interactive_authentication); 1997 M_CP_INTOPT(permit_root_login); 1998 M_CP_INTOPT(permit_empty_passwd); 1999 2000 M_CP_INTOPT(allow_tcp_forwarding); 2001 M_CP_INTOPT(allow_streamlocal_forwarding); 2002 M_CP_INTOPT(allow_agent_forwarding); 2003 M_CP_INTOPT(disable_forwarding); 2004 M_CP_INTOPT(permit_tun); 2005 M_CP_INTOPT(fwd_opts.gateway_ports); 2006 M_CP_INTOPT(fwd_opts.streamlocal_bind_unlink); 2007 M_CP_INTOPT(x11_display_offset); 2008 M_CP_INTOPT(x11_forwarding); 2009 M_CP_INTOPT(x11_use_localhost); 2010 M_CP_INTOPT(permit_tty); 2011 M_CP_INTOPT(permit_user_rc); 2012 M_CP_INTOPT(max_sessions); 2013 M_CP_INTOPT(max_authtries); 2014 M_CP_INTOPT(client_alive_count_max); 2015 M_CP_INTOPT(client_alive_interval); 2016 M_CP_INTOPT(ip_qos_interactive); 2017 M_CP_INTOPT(ip_qos_bulk); 2018 M_CP_INTOPT(rekey_limit); 2019 M_CP_INTOPT(rekey_interval); 2020 2021 /* 2022 * The bind_mask is a mode_t that may be unsigned, so we can't use 2023 * M_CP_INTOPT - it does a signed comparison that causes compiler 2024 * warnings. 2025 */ 2026 if (src->fwd_opts.streamlocal_bind_mask != (mode_t)-1) { 2027 dst->fwd_opts.streamlocal_bind_mask = 2028 src->fwd_opts.streamlocal_bind_mask; 2029 } 2030 2031 /* M_CP_STROPT and M_CP_STRARRAYOPT should not appear before here */ 2032#define M_CP_STROPT(n) do {\ 2033 if (src->n != NULL && dst->n != src->n) { \ 2034 free(dst->n); \ 2035 dst->n = src->n; \ 2036 } \ 2037} while(0) 2038#define M_CP_STRARRAYOPT(n, num_n) do {\ 2039 if (src->num_n != 0) { \ 2040 for (dst->num_n = 0; dst->num_n < src->num_n; dst->num_n++) \ 2041 dst->n[dst->num_n] = xstrdup(src->n[dst->num_n]); \ 2042 } \ 2043} while(0) 2044 2045 /* See comment in servconf.h */ 2046 COPY_MATCH_STRING_OPTS(); 2047 2048 /* Arguments that accept '+...' need to be expanded */ 2049 assemble_algorithms(dst); 2050 2051 /* 2052 * The only things that should be below this point are string options 2053 * which are only used after authentication. 2054 */ 2055 if (preauth) 2056 return; 2057 2058 /* These options may be "none" to clear a global setting */ 2059 M_CP_STROPT(adm_forced_command); 2060 if (option_clear_or_none(dst->adm_forced_command)) { 2061 free(dst->adm_forced_command); 2062 dst->adm_forced_command = NULL; 2063 } 2064 M_CP_STROPT(chroot_directory); 2065 if (option_clear_or_none(dst->chroot_directory)) { 2066 free(dst->chroot_directory); 2067 dst->chroot_directory = NULL; 2068 } 2069} 2070 2071#undef M_CP_INTOPT 2072#undef M_CP_STROPT 2073#undef M_CP_STRARRAYOPT 2074 2075void 2076parse_server_config(ServerOptions *options, const char *filename, Buffer *conf, 2077 struct connection_info *connectinfo) 2078{ 2079 int active, linenum, bad_options = 0; 2080 char *cp, *obuf, *cbuf; 2081 2082 debug2("%s: config %s len %d", __func__, filename, buffer_len(conf)); 2083 2084 if ((obuf = cbuf = sshbuf_dup_string(conf)) == NULL) 2085 fatal("%s: sshbuf_dup_string failed", __func__); 2086 active = connectinfo ? 0 : 1; 2087 linenum = 1; 2088 while ((cp = strsep(&cbuf, "\n")) != NULL) { 2089 if (process_server_config_line(options, cp, filename, 2090 linenum++, &active, connectinfo) != 0) 2091 bad_options++; 2092 } 2093 free(obuf); 2094 if (bad_options > 0) 2095 fatal("%s: terminating, %d bad configuration options", 2096 filename, bad_options); 2097 process_queued_listen_addrs(options); 2098} 2099 2100static const char * 2101fmt_multistate_int(int val, const struct multistate *m) 2102{ 2103 u_int i; 2104 2105 for (i = 0; m[i].key != NULL; i++) { 2106 if (m[i].value == val) 2107 return m[i].key; 2108 } 2109 return "UNKNOWN"; 2110} 2111 2112static const char * 2113fmt_intarg(ServerOpCodes code, int val) 2114{ 2115 if (val == -1) 2116 return "unset"; 2117 switch (code) { 2118 case sAddressFamily: 2119 return fmt_multistate_int(val, multistate_addressfamily); 2120 case sPermitRootLogin: 2121 return fmt_multistate_int(val, multistate_permitrootlogin); 2122 case sGatewayPorts: 2123 return fmt_multistate_int(val, multistate_gatewayports); 2124 case sCompression: 2125 return fmt_multistate_int(val, multistate_compression); 2126 case sAllowTcpForwarding: 2127 return fmt_multistate_int(val, multistate_tcpfwd); 2128 case sAllowStreamLocalForwarding: 2129 return fmt_multistate_int(val, multistate_tcpfwd); 2130 case sFingerprintHash: 2131 return ssh_digest_alg_name(val); 2132 default: 2133 switch (val) { 2134 case 0: 2135 return "no"; 2136 case 1: 2137 return "yes"; 2138 default: 2139 return "UNKNOWN"; 2140 } 2141 } 2142} 2143 2144static const char * 2145lookup_opcode_name(ServerOpCodes code) 2146{ 2147 u_int i; 2148 2149 for (i = 0; keywords[i].name != NULL; i++) 2150 if (keywords[i].opcode == code) 2151 return(keywords[i].name); 2152 return "UNKNOWN"; 2153} 2154 2155static void 2156dump_cfg_int(ServerOpCodes code, int val) 2157{ 2158 printf("%s %d\n", lookup_opcode_name(code), val); 2159} 2160 2161static void 2162dump_cfg_oct(ServerOpCodes code, int val) 2163{ 2164 printf("%s 0%o\n", lookup_opcode_name(code), val); 2165} 2166 2167static void 2168dump_cfg_fmtint(ServerOpCodes code, int val) 2169{ 2170 printf("%s %s\n", lookup_opcode_name(code), fmt_intarg(code, val)); 2171} 2172 2173static void 2174dump_cfg_string(ServerOpCodes code, const char *val) 2175{ 2176 printf("%s %s\n", lookup_opcode_name(code), 2177 val == NULL ? "none" : val); 2178} 2179 2180static void 2181dump_cfg_strarray(ServerOpCodes code, u_int count, char **vals) 2182{ 2183 u_int i; 2184 2185 for (i = 0; i < count; i++) 2186 printf("%s %s\n", lookup_opcode_name(code), vals[i]); 2187} 2188 2189static void 2190dump_cfg_strarray_oneline(ServerOpCodes code, u_int count, char **vals) 2191{ 2192 u_int i; 2193 2194 if (count <= 0 && code != sAuthenticationMethods) 2195 return; 2196 printf("%s", lookup_opcode_name(code)); 2197 for (i = 0; i < count; i++) 2198 printf(" %s", vals[i]); 2199 if (code == sAuthenticationMethods && count == 0) 2200 printf(" any"); 2201 printf("\n"); 2202} 2203 2204void 2205dump_config(ServerOptions *o) 2206{ 2207 u_int i; 2208 int ret; 2209 struct addrinfo *ai; 2210 char addr[NI_MAXHOST], port[NI_MAXSERV], *s = NULL; 2211 char *laddr1 = xstrdup(""), *laddr2 = NULL; 2212 2213 /* these are usually at the top of the config */ 2214 for (i = 0; i < o->num_ports; i++) 2215 printf("port %d\n", o->ports[i]); 2216 dump_cfg_fmtint(sAddressFamily, o->address_family); 2217 2218 /* 2219 * ListenAddress must be after Port. add_one_listen_addr pushes 2220 * addresses onto a stack, so to maintain ordering we need to 2221 * print these in reverse order. 2222 */ 2223 for (ai = o->listen_addrs; ai; ai = ai->ai_next) { 2224 if ((ret = getnameinfo(ai->ai_addr, ai->ai_addrlen, addr, 2225 sizeof(addr), port, sizeof(port), 2226 NI_NUMERICHOST|NI_NUMERICSERV)) != 0) { 2227 error("getnameinfo failed: %.100s", 2228 (ret != EAI_SYSTEM) ? gai_strerror(ret) : 2229 strerror(errno)); 2230 } else { 2231 laddr2 = laddr1; 2232 if (ai->ai_family == AF_INET6) 2233 xasprintf(&laddr1, "listenaddress [%s]:%s\n%s", 2234 addr, port, laddr2); 2235 else 2236 xasprintf(&laddr1, "listenaddress %s:%s\n%s", 2237 addr, port, laddr2); 2238 free(laddr2); 2239 } 2240 } 2241 printf("%s", laddr1); 2242 free(laddr1); 2243 2244 /* integer arguments */ 2245#ifdef USE_PAM 2246 dump_cfg_fmtint(sUsePAM, o->use_pam); 2247#endif 2248 dump_cfg_int(sLoginGraceTime, o->login_grace_time); 2249 dump_cfg_int(sX11DisplayOffset, o->x11_display_offset); 2250 dump_cfg_int(sMaxAuthTries, o->max_authtries); 2251 dump_cfg_int(sMaxSessions, o->max_sessions); 2252 dump_cfg_int(sClientAliveInterval, o->client_alive_interval); 2253 dump_cfg_int(sClientAliveCountMax, o->client_alive_count_max); 2254 dump_cfg_oct(sStreamLocalBindMask, o->fwd_opts.streamlocal_bind_mask); 2255 2256 /* formatted integer arguments */ 2257 dump_cfg_fmtint(sPermitRootLogin, o->permit_root_login); 2258 dump_cfg_fmtint(sIgnoreRhosts, o->ignore_rhosts); 2259 dump_cfg_fmtint(sIgnoreUserKnownHosts, o->ignore_user_known_hosts); 2260 dump_cfg_fmtint(sHostbasedAuthentication, o->hostbased_authentication); 2261 dump_cfg_fmtint(sHostbasedUsesNameFromPacketOnly, 2262 o->hostbased_uses_name_from_packet_only); 2263 dump_cfg_fmtint(sPubkeyAuthentication, o->pubkey_authentication); 2264#ifdef KRB5 2265 dump_cfg_fmtint(sKerberosAuthentication, o->kerberos_authentication); 2266 dump_cfg_fmtint(sKerberosOrLocalPasswd, o->kerberos_or_local_passwd); 2267 dump_cfg_fmtint(sKerberosTicketCleanup, o->kerberos_ticket_cleanup); 2268# ifdef USE_AFS 2269 dump_cfg_fmtint(sKerberosGetAFSToken, o->kerberos_get_afs_token); 2270# endif 2271#endif 2272#ifdef GSSAPI 2273 dump_cfg_fmtint(sGssAuthentication, o->gss_authentication); 2274 dump_cfg_fmtint(sGssCleanupCreds, o->gss_cleanup_creds); 2275#endif 2276 dump_cfg_fmtint(sPasswordAuthentication, o->password_authentication); 2277 dump_cfg_fmtint(sKbdInteractiveAuthentication, 2278 o->kbd_interactive_authentication); 2279 dump_cfg_fmtint(sChallengeResponseAuthentication, 2280 o->challenge_response_authentication); 2281 dump_cfg_fmtint(sPrintMotd, o->print_motd); 2282#ifndef DISABLE_LASTLOG 2283 dump_cfg_fmtint(sPrintLastLog, o->print_lastlog); 2284#endif 2285 dump_cfg_fmtint(sX11Forwarding, o->x11_forwarding); 2286 dump_cfg_fmtint(sX11UseLocalhost, o->x11_use_localhost); 2287 dump_cfg_fmtint(sPermitTTY, o->permit_tty); 2288 dump_cfg_fmtint(sPermitUserRC, o->permit_user_rc); 2289 dump_cfg_fmtint(sStrictModes, o->strict_modes); 2290 dump_cfg_fmtint(sTCPKeepAlive, o->tcp_keep_alive); 2291 dump_cfg_fmtint(sEmptyPasswd, o->permit_empty_passwd); 2292 dump_cfg_fmtint(sPermitUserEnvironment, o->permit_user_env); 2293 dump_cfg_fmtint(sCompression, o->compression); 2294 dump_cfg_fmtint(sGatewayPorts, o->fwd_opts.gateway_ports); 2295 dump_cfg_fmtint(sUseDNS, o->use_dns); 2296 dump_cfg_fmtint(sAllowTcpForwarding, o->allow_tcp_forwarding); 2297 dump_cfg_fmtint(sAllowAgentForwarding, o->allow_agent_forwarding); 2298 dump_cfg_fmtint(sDisableForwarding, o->disable_forwarding); 2299 dump_cfg_fmtint(sAllowStreamLocalForwarding, o->allow_streamlocal_forwarding); 2300 dump_cfg_fmtint(sStreamLocalBindUnlink, o->fwd_opts.streamlocal_bind_unlink); 2301 dump_cfg_fmtint(sFingerprintHash, o->fingerprint_hash); 2302 dump_cfg_fmtint(sUseBlacklist, o->use_blacklist); 2303 2304 /* string arguments */ 2305 dump_cfg_string(sPidFile, o->pid_file); 2306 dump_cfg_string(sXAuthLocation, o->xauth_location); 2307 dump_cfg_string(sCiphers, o->ciphers ? o->ciphers : KEX_SERVER_ENCRYPT); 2308 dump_cfg_string(sMacs, o->macs ? o->macs : KEX_SERVER_MAC); 2309 dump_cfg_string(sBanner, o->banner); 2310 dump_cfg_string(sForceCommand, o->adm_forced_command); 2311 dump_cfg_string(sChrootDirectory, o->chroot_directory); 2312 dump_cfg_string(sTrustedUserCAKeys, o->trusted_user_ca_keys); 2313 dump_cfg_string(sRevokedKeys, o->revoked_keys_file); 2314 dump_cfg_string(sAuthorizedPrincipalsFile, 2315 o->authorized_principals_file); 2316 dump_cfg_string(sVersionAddendum, *o->version_addendum == '\0' 2317 ? "none" : o->version_addendum); 2318 dump_cfg_string(sAuthorizedKeysCommand, o->authorized_keys_command); 2319 dump_cfg_string(sAuthorizedKeysCommandUser, o->authorized_keys_command_user); 2320 dump_cfg_string(sAuthorizedPrincipalsCommand, o->authorized_principals_command); 2321 dump_cfg_string(sAuthorizedPrincipalsCommandUser, o->authorized_principals_command_user); 2322 dump_cfg_string(sHostKeyAgent, o->host_key_agent); 2323 dump_cfg_string(sKexAlgorithms, 2324 o->kex_algorithms ? o->kex_algorithms : KEX_SERVER_KEX); 2325 dump_cfg_string(sHostbasedAcceptedKeyTypes, o->hostbased_key_types ? 2326 o->hostbased_key_types : KEX_DEFAULT_PK_ALG); 2327 dump_cfg_string(sHostKeyAlgorithms, o->hostkeyalgorithms ? 2328 o->hostkeyalgorithms : KEX_DEFAULT_PK_ALG); 2329 dump_cfg_string(sPubkeyAcceptedKeyTypes, o->pubkey_key_types ? 2330 o->pubkey_key_types : KEX_DEFAULT_PK_ALG); 2331 2332 /* string arguments requiring a lookup */ 2333 dump_cfg_string(sLogLevel, log_level_name(o->log_level)); 2334 dump_cfg_string(sLogFacility, log_facility_name(o->log_facility)); 2335 2336 /* string array arguments */ 2337 dump_cfg_strarray_oneline(sAuthorizedKeysFile, o->num_authkeys_files, 2338 o->authorized_keys_files); 2339 dump_cfg_strarray(sHostKeyFile, o->num_host_key_files, 2340 o->host_key_files); 2341 dump_cfg_strarray(sHostCertificate, o->num_host_cert_files, 2342 o->host_cert_files); 2343 dump_cfg_strarray(sAllowUsers, o->num_allow_users, o->allow_users); 2344 dump_cfg_strarray(sDenyUsers, o->num_deny_users, o->deny_users); 2345 dump_cfg_strarray(sAllowGroups, o->num_allow_groups, o->allow_groups); 2346 dump_cfg_strarray(sDenyGroups, o->num_deny_groups, o->deny_groups); 2347 dump_cfg_strarray(sAcceptEnv, o->num_accept_env, o->accept_env); 2348 dump_cfg_strarray_oneline(sAuthenticationMethods, 2349 o->num_auth_methods, o->auth_methods); 2350 2351 /* other arguments */ 2352 for (i = 0; i < o->num_subsystems; i++) 2353 printf("subsystem %s %s\n", o->subsystem_name[i], 2354 o->subsystem_args[i]); 2355 2356 printf("maxstartups %d:%d:%d\n", o->max_startups_begin, 2357 o->max_startups_rate, o->max_startups); 2358 2359 for (i = 0; tunmode_desc[i].val != -1; i++) 2360 if (tunmode_desc[i].val == o->permit_tun) { 2361 s = tunmode_desc[i].text; 2362 break; 2363 } 2364 dump_cfg_string(sPermitTunnel, s); 2365 2366 printf("ipqos %s ", iptos2str(o->ip_qos_interactive)); 2367 printf("%s\n", iptos2str(o->ip_qos_bulk)); 2368 2369 printf("rekeylimit %llu %d\n", (unsigned long long)o->rekey_limit, 2370 o->rekey_interval); 2371 2372 channel_print_adm_permitted_opens(); 2373} 2374