Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame^] | 1 | /* $OpenBSD: servconf.c,v 1.222 2011/06/22 21:57:01 djm Exp $ */ |
| 2 | /* |
| 3 | * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland |
| 4 | * All rights reserved |
| 5 | * |
| 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". |
| 11 | */ |
| 12 | |
| 13 | #include "includes.h" |
| 14 | |
| 15 | #include <sys/types.h> |
| 16 | #include <sys/socket.h> |
| 17 | |
| 18 | #include <netinet/in.h> |
| 19 | #include <netinet/in_systm.h> |
| 20 | #include <netinet/ip.h> |
| 21 | |
| 22 | #include <netdb.h> |
| 23 | #include <pwd.h> |
| 24 | #include <stdio.h> |
| 25 | #include <stdlib.h> |
| 26 | #include <string.h> |
| 27 | #include <signal.h> |
| 28 | #include <unistd.h> |
| 29 | #include <stdarg.h> |
| 30 | #include <errno.h> |
| 31 | |
| 32 | #include "openbsd-compat/sys-queue.h" |
| 33 | #include "xmalloc.h" |
| 34 | #include "ssh.h" |
| 35 | #include "log.h" |
| 36 | #include "buffer.h" |
| 37 | #include "servconf.h" |
| 38 | #include "compat.h" |
| 39 | #include "pathnames.h" |
| 40 | #include "misc.h" |
| 41 | #include "cipher.h" |
| 42 | #include "key.h" |
| 43 | #include "kex.h" |
| 44 | #include "mac.h" |
| 45 | #include "match.h" |
| 46 | #include "channels.h" |
| 47 | #include "groupaccess.h" |
| 48 | |
| 49 | #ifdef ANDROID |
| 50 | #include <cutils/properties.h> |
| 51 | #endif |
| 52 | |
| 53 | static void add_listen_addr(ServerOptions *, char *, int); |
| 54 | static void add_one_listen_addr(ServerOptions *, char *, int); |
| 55 | |
| 56 | /* Use of privilege separation or not */ |
| 57 | extern int use_privsep; |
| 58 | extern Buffer cfg; |
| 59 | |
| 60 | /* Initializes the server options to their default values. */ |
| 61 | |
| 62 | void |
| 63 | initialize_server_options(ServerOptions *options) |
| 64 | { |
| 65 | memset(options, 0, sizeof(*options)); |
| 66 | |
| 67 | /* Portable-specific options */ |
| 68 | options->use_pam = -1; |
| 69 | |
| 70 | /* Standard Options */ |
| 71 | options->num_ports = 0; |
| 72 | options->ports_from_cmdline = 0; |
| 73 | options->listen_addrs = NULL; |
| 74 | options->address_family = -1; |
| 75 | options->num_host_key_files = 0; |
| 76 | options->num_host_cert_files = 0; |
| 77 | options->pid_file = NULL; |
| 78 | options->server_key_bits = -1; |
| 79 | options->login_grace_time = -1; |
| 80 | options->key_regeneration_time = -1; |
| 81 | options->permit_root_login = PERMIT_NOT_SET; |
| 82 | options->ignore_rhosts = -1; |
| 83 | options->ignore_user_known_hosts = -1; |
| 84 | options->print_motd = -1; |
| 85 | options->print_lastlog = -1; |
| 86 | options->x11_forwarding = -1; |
| 87 | options->x11_display_offset = -1; |
| 88 | options->x11_use_localhost = -1; |
| 89 | options->xauth_location = NULL; |
| 90 | options->strict_modes = -1; |
| 91 | options->tcp_keep_alive = -1; |
| 92 | options->log_facility = SYSLOG_FACILITY_NOT_SET; |
| 93 | options->log_level = SYSLOG_LEVEL_NOT_SET; |
| 94 | options->rhosts_rsa_authentication = -1; |
| 95 | options->hostbased_authentication = -1; |
| 96 | options->hostbased_uses_name_from_packet_only = -1; |
| 97 | options->rsa_authentication = -1; |
| 98 | options->pubkey_authentication = -1; |
| 99 | options->kerberos_authentication = -1; |
| 100 | options->kerberos_or_local_passwd = -1; |
| 101 | options->kerberos_ticket_cleanup = -1; |
| 102 | options->kerberos_get_afs_token = -1; |
| 103 | options->gss_authentication=-1; |
| 104 | options->gss_cleanup_creds = -1; |
| 105 | options->password_authentication = -1; |
| 106 | options->kbd_interactive_authentication = -1; |
| 107 | options->challenge_response_authentication = -1; |
| 108 | options->permit_empty_passwd = -1; |
| 109 | options->permit_user_env = -1; |
| 110 | options->use_login = -1; |
| 111 | options->compression = -1; |
| 112 | options->allow_tcp_forwarding = -1; |
| 113 | options->allow_agent_forwarding = -1; |
| 114 | options->num_allow_users = 0; |
| 115 | options->num_deny_users = 0; |
| 116 | options->num_allow_groups = 0; |
| 117 | options->num_deny_groups = 0; |
| 118 | options->ciphers = NULL; |
| 119 | options->macs = NULL; |
| 120 | options->kex_algorithms = NULL; |
| 121 | options->protocol = SSH_PROTO_UNKNOWN; |
| 122 | options->gateway_ports = -1; |
| 123 | options->num_subsystems = 0; |
| 124 | options->max_startups_begin = -1; |
| 125 | options->max_startups_rate = -1; |
| 126 | options->max_startups = -1; |
| 127 | options->max_authtries = -1; |
| 128 | options->max_sessions = -1; |
| 129 | options->banner = NULL; |
| 130 | options->use_dns = -1; |
| 131 | options->client_alive_interval = -1; |
| 132 | options->client_alive_count_max = -1; |
| 133 | options->num_authkeys_files = 0; |
| 134 | options->num_accept_env = 0; |
| 135 | options->permit_tun = -1; |
| 136 | options->num_permitted_opens = -1; |
| 137 | options->adm_forced_command = NULL; |
| 138 | options->chroot_directory = NULL; |
| 139 | options->zero_knowledge_password_authentication = -1; |
| 140 | options->revoked_keys_file = NULL; |
| 141 | options->trusted_user_ca_keys = NULL; |
| 142 | options->authorized_principals_file = NULL; |
| 143 | options->ip_qos_interactive = -1; |
| 144 | options->ip_qos_bulk = -1; |
| 145 | } |
| 146 | |
| 147 | void |
| 148 | fill_default_server_options(ServerOptions *options) |
| 149 | { |
| 150 | /* Portable-specific options */ |
| 151 | if (options->use_pam == -1) |
| 152 | options->use_pam = 0; |
| 153 | |
| 154 | /* Standard Options */ |
| 155 | if (options->protocol == SSH_PROTO_UNKNOWN) |
| 156 | options->protocol = SSH_PROTO_2; |
| 157 | if (options->num_host_key_files == 0) { |
| 158 | /* fill default hostkeys for protocols */ |
| 159 | if (options->protocol & SSH_PROTO_1) |
| 160 | options->host_key_files[options->num_host_key_files++] = |
| 161 | _PATH_HOST_KEY_FILE; |
| 162 | if (options->protocol & SSH_PROTO_2) { |
| 163 | options->host_key_files[options->num_host_key_files++] = |
| 164 | _PATH_HOST_RSA_KEY_FILE; |
| 165 | options->host_key_files[options->num_host_key_files++] = |
| 166 | _PATH_HOST_DSA_KEY_FILE; |
| 167 | #ifdef OPENSSL_HAS_ECC |
| 168 | options->host_key_files[options->num_host_key_files++] = |
| 169 | _PATH_HOST_ECDSA_KEY_FILE; |
| 170 | #endif |
| 171 | } |
| 172 | } |
| 173 | /* No certificates by default */ |
| 174 | if (options->num_ports == 0) |
| 175 | options->ports[options->num_ports++] = SSH_DEFAULT_PORT; |
| 176 | if (options->listen_addrs == NULL) |
| 177 | add_listen_addr(options, NULL, 0); |
| 178 | if (options->pid_file == NULL) |
| 179 | options->pid_file = _PATH_SSH_DAEMON_PID_FILE; |
| 180 | if (options->server_key_bits == -1) |
| 181 | options->server_key_bits = 1024; |
| 182 | if (options->login_grace_time == -1) |
| 183 | options->login_grace_time = 120; |
| 184 | if (options->key_regeneration_time == -1) |
| 185 | options->key_regeneration_time = 3600; |
| 186 | if (options->permit_root_login == PERMIT_NOT_SET) |
| 187 | options->permit_root_login = PERMIT_YES; |
| 188 | if (options->ignore_rhosts == -1) |
| 189 | options->ignore_rhosts = 1; |
| 190 | if (options->ignore_user_known_hosts == -1) |
| 191 | options->ignore_user_known_hosts = 0; |
| 192 | if (options->print_motd == -1) |
| 193 | options->print_motd = 1; |
| 194 | if (options->print_lastlog == -1) |
| 195 | options->print_lastlog = 1; |
| 196 | if (options->x11_forwarding == -1) |
| 197 | options->x11_forwarding = 0; |
| 198 | if (options->x11_display_offset == -1) |
| 199 | options->x11_display_offset = 10; |
| 200 | if (options->x11_use_localhost == -1) |
| 201 | options->x11_use_localhost = 1; |
| 202 | if (options->xauth_location == NULL) |
| 203 | options->xauth_location = _PATH_XAUTH; |
| 204 | if (options->strict_modes == -1) |
| 205 | options->strict_modes = 1; |
| 206 | if (options->tcp_keep_alive == -1) |
| 207 | options->tcp_keep_alive = 1; |
| 208 | if (options->log_facility == SYSLOG_FACILITY_NOT_SET) |
| 209 | options->log_facility = SYSLOG_FACILITY_AUTH; |
| 210 | if (options->log_level == SYSLOG_LEVEL_NOT_SET) |
| 211 | options->log_level = SYSLOG_LEVEL_INFO; |
| 212 | if (options->rhosts_rsa_authentication == -1) |
| 213 | options->rhosts_rsa_authentication = 0; |
| 214 | if (options->hostbased_authentication == -1) |
| 215 | options->hostbased_authentication = 0; |
| 216 | if (options->hostbased_uses_name_from_packet_only == -1) |
| 217 | options->hostbased_uses_name_from_packet_only = 0; |
| 218 | if (options->rsa_authentication == -1) |
| 219 | options->rsa_authentication = 1; |
| 220 | if (options->pubkey_authentication == -1) |
| 221 | options->pubkey_authentication = 1; |
| 222 | if (options->kerberos_authentication == -1) |
| 223 | options->kerberos_authentication = 0; |
| 224 | if (options->kerberos_or_local_passwd == -1) |
| 225 | options->kerberos_or_local_passwd = 1; |
| 226 | if (options->kerberos_ticket_cleanup == -1) |
| 227 | options->kerberos_ticket_cleanup = 1; |
| 228 | if (options->kerberos_get_afs_token == -1) |
| 229 | options->kerberos_get_afs_token = 0; |
| 230 | if (options->gss_authentication == -1) |
| 231 | options->gss_authentication = 0; |
| 232 | if (options->gss_cleanup_creds == -1) |
| 233 | options->gss_cleanup_creds = 1; |
| 234 | if (options->password_authentication == -1) |
| 235 | options->password_authentication = 1; |
| 236 | if (options->kbd_interactive_authentication == -1) |
| 237 | options->kbd_interactive_authentication = 0; |
| 238 | if (options->challenge_response_authentication == -1) |
| 239 | options->challenge_response_authentication = 1; |
| 240 | if (options->permit_empty_passwd == -1) |
| 241 | options->permit_empty_passwd = 0; |
| 242 | if (options->permit_user_env == -1) |
| 243 | options->permit_user_env = 0; |
| 244 | if (options->use_login == -1) |
| 245 | options->use_login = 0; |
| 246 | if (options->compression == -1) |
| 247 | options->compression = COMP_DELAYED; |
| 248 | if (options->allow_tcp_forwarding == -1) |
| 249 | options->allow_tcp_forwarding = 1; |
| 250 | if (options->allow_agent_forwarding == -1) |
| 251 | options->allow_agent_forwarding = 1; |
| 252 | if (options->gateway_ports == -1) |
| 253 | options->gateway_ports = 0; |
| 254 | if (options->max_startups == -1) |
| 255 | options->max_startups = 10; |
| 256 | if (options->max_startups_rate == -1) |
| 257 | options->max_startups_rate = 100; /* 100% */ |
| 258 | if (options->max_startups_begin == -1) |
| 259 | options->max_startups_begin = options->max_startups; |
| 260 | if (options->max_authtries == -1) |
| 261 | options->max_authtries = DEFAULT_AUTH_FAIL_MAX; |
| 262 | if (options->max_sessions == -1) |
| 263 | options->max_sessions = DEFAULT_SESSIONS_MAX; |
| 264 | if (options->use_dns == -1) |
| 265 | options->use_dns = 1; |
| 266 | if (options->client_alive_interval == -1) |
| 267 | options->client_alive_interval = 0; |
| 268 | if (options->client_alive_count_max == -1) |
| 269 | options->client_alive_count_max = 3; |
| 270 | if (options->num_authkeys_files == 0) { |
| 271 | options->authorized_keys_files[options->num_authkeys_files++] = |
| 272 | xstrdup(_PATH_SSH_USER_PERMITTED_KEYS); |
| 273 | options->authorized_keys_files[options->num_authkeys_files++] = |
| 274 | xstrdup(_PATH_SSH_USER_PERMITTED_KEYS2); |
| 275 | } |
| 276 | if (options->permit_tun == -1) |
| 277 | options->permit_tun = SSH_TUNMODE_NO; |
| 278 | if (options->zero_knowledge_password_authentication == -1) |
| 279 | options->zero_knowledge_password_authentication = 0; |
| 280 | if (options->ip_qos_interactive == -1) |
| 281 | options->ip_qos_interactive = IPTOS_LOWDELAY; |
| 282 | if (options->ip_qos_bulk == -1) |
| 283 | options->ip_qos_bulk = IPTOS_THROUGHPUT; |
| 284 | |
| 285 | /* Turn privilege separation on by default */ |
| 286 | if (use_privsep == -1) |
| 287 | use_privsep = PRIVSEP_ON; |
| 288 | |
| 289 | #ifndef HAVE_MMAP |
| 290 | if (use_privsep && options->compression == 1) { |
| 291 | error("This platform does not support both privilege " |
| 292 | "separation and compression"); |
| 293 | error("Compression disabled"); |
| 294 | options->compression = 0; |
| 295 | } |
| 296 | #endif |
| 297 | |
| 298 | } |
| 299 | |
| 300 | /* Keyword tokens. */ |
| 301 | typedef enum { |
| 302 | sBadOption, /* == unknown option */ |
| 303 | /* Portable-specific options */ |
| 304 | sUsePAM, |
| 305 | /* Standard Options */ |
| 306 | sPort, sHostKeyFile, sServerKeyBits, sLoginGraceTime, sKeyRegenerationTime, |
| 307 | sPermitRootLogin, sLogFacility, sLogLevel, |
| 308 | sRhostsRSAAuthentication, sRSAAuthentication, |
| 309 | sKerberosAuthentication, sKerberosOrLocalPasswd, sKerberosTicketCleanup, |
| 310 | sKerberosGetAFSToken, |
| 311 | sKerberosTgtPassing, sChallengeResponseAuthentication, |
| 312 | sPasswordAuthentication, sKbdInteractiveAuthentication, |
| 313 | sListenAddress, sAddressFamily, |
| 314 | sPrintMotd, sPrintLastLog, sIgnoreRhosts, |
| 315 | sX11Forwarding, sX11DisplayOffset, sX11UseLocalhost, |
| 316 | sStrictModes, sEmptyPasswd, sTCPKeepAlive, |
| 317 | sPermitUserEnvironment, sUseLogin, sAllowTcpForwarding, sCompression, |
| 318 | sAllowUsers, sDenyUsers, sAllowGroups, sDenyGroups, |
| 319 | sIgnoreUserKnownHosts, sCiphers, sMacs, sProtocol, sPidFile, |
| 320 | sGatewayPorts, sPubkeyAuthentication, sXAuthLocation, sSubsystem, |
| 321 | sMaxStartups, sMaxAuthTries, sMaxSessions, |
| 322 | sBanner, sUseDNS, sHostbasedAuthentication, |
| 323 | sHostbasedUsesNameFromPacketOnly, sClientAliveInterval, |
| 324 | sClientAliveCountMax, sAuthorizedKeysFile, |
| 325 | sGssAuthentication, sGssCleanupCreds, sAcceptEnv, sPermitTunnel, |
| 326 | sMatch, sPermitOpen, sForceCommand, sChrootDirectory, |
| 327 | sUsePrivilegeSeparation, sAllowAgentForwarding, |
| 328 | sZeroKnowledgePasswordAuthentication, sHostCertificate, |
| 329 | sRevokedKeys, sTrustedUserCAKeys, sAuthorizedPrincipalsFile, |
| 330 | sKexAlgorithms, sIPQoS, |
| 331 | sDeprecated, sUnsupported |
| 332 | } ServerOpCodes; |
| 333 | |
| 334 | #define SSHCFG_GLOBAL 0x01 /* allowed in main section of sshd_config */ |
| 335 | #define SSHCFG_MATCH 0x02 /* allowed inside a Match section */ |
| 336 | #define SSHCFG_ALL (SSHCFG_GLOBAL|SSHCFG_MATCH) |
| 337 | |
| 338 | /* Textual representation of the tokens. */ |
| 339 | static struct { |
| 340 | const char *name; |
| 341 | ServerOpCodes opcode; |
| 342 | u_int flags; |
| 343 | } keywords[] = { |
| 344 | /* Portable-specific options */ |
| 345 | #ifdef USE_PAM |
| 346 | { "usepam", sUsePAM, SSHCFG_GLOBAL }, |
| 347 | #else |
| 348 | { "usepam", sUnsupported, SSHCFG_GLOBAL }, |
| 349 | #endif |
| 350 | { "pamauthenticationviakbdint", sDeprecated, SSHCFG_GLOBAL }, |
| 351 | /* Standard Options */ |
| 352 | { "port", sPort, SSHCFG_GLOBAL }, |
| 353 | { "hostkey", sHostKeyFile, SSHCFG_GLOBAL }, |
| 354 | { "hostdsakey", sHostKeyFile, SSHCFG_GLOBAL }, /* alias */ |
| 355 | { "pidfile", sPidFile, SSHCFG_GLOBAL }, |
| 356 | { "serverkeybits", sServerKeyBits, SSHCFG_GLOBAL }, |
| 357 | { "logingracetime", sLoginGraceTime, SSHCFG_GLOBAL }, |
| 358 | { "keyregenerationinterval", sKeyRegenerationTime, SSHCFG_GLOBAL }, |
| 359 | { "permitrootlogin", sPermitRootLogin, SSHCFG_ALL }, |
| 360 | { "syslogfacility", sLogFacility, SSHCFG_GLOBAL }, |
| 361 | { "loglevel", sLogLevel, SSHCFG_GLOBAL }, |
| 362 | { "rhostsauthentication", sDeprecated, SSHCFG_GLOBAL }, |
| 363 | { "rhostsrsaauthentication", sRhostsRSAAuthentication, SSHCFG_ALL }, |
| 364 | { "hostbasedauthentication", sHostbasedAuthentication, SSHCFG_ALL }, |
| 365 | { "hostbasedusesnamefrompacketonly", sHostbasedUsesNameFromPacketOnly, SSHCFG_ALL }, |
| 366 | { "rsaauthentication", sRSAAuthentication, SSHCFG_ALL }, |
| 367 | { "pubkeyauthentication", sPubkeyAuthentication, SSHCFG_ALL }, |
| 368 | { "dsaauthentication", sPubkeyAuthentication, SSHCFG_GLOBAL }, /* alias */ |
| 369 | #ifdef KRB5 |
| 370 | { "kerberosauthentication", sKerberosAuthentication, SSHCFG_ALL }, |
| 371 | { "kerberosorlocalpasswd", sKerberosOrLocalPasswd, SSHCFG_GLOBAL }, |
| 372 | { "kerberosticketcleanup", sKerberosTicketCleanup, SSHCFG_GLOBAL }, |
| 373 | #ifdef USE_AFS |
| 374 | { "kerberosgetafstoken", sKerberosGetAFSToken, SSHCFG_GLOBAL }, |
| 375 | #else |
| 376 | { "kerberosgetafstoken", sUnsupported, SSHCFG_GLOBAL }, |
| 377 | #endif |
| 378 | #else |
| 379 | { "kerberosauthentication", sUnsupported, SSHCFG_ALL }, |
| 380 | { "kerberosorlocalpasswd", sUnsupported, SSHCFG_GLOBAL }, |
| 381 | { "kerberosticketcleanup", sUnsupported, SSHCFG_GLOBAL }, |
| 382 | { "kerberosgetafstoken", sUnsupported, SSHCFG_GLOBAL }, |
| 383 | #endif |
| 384 | { "kerberostgtpassing", sUnsupported, SSHCFG_GLOBAL }, |
| 385 | { "afstokenpassing", sUnsupported, SSHCFG_GLOBAL }, |
| 386 | #ifdef GSSAPI |
| 387 | { "gssapiauthentication", sGssAuthentication, SSHCFG_ALL }, |
| 388 | { "gssapicleanupcredentials", sGssCleanupCreds, SSHCFG_GLOBAL }, |
| 389 | #else |
| 390 | { "gssapiauthentication", sUnsupported, SSHCFG_ALL }, |
| 391 | { "gssapicleanupcredentials", sUnsupported, SSHCFG_GLOBAL }, |
| 392 | #endif |
| 393 | { "passwordauthentication", sPasswordAuthentication, SSHCFG_ALL }, |
| 394 | { "kbdinteractiveauthentication", sKbdInteractiveAuthentication, SSHCFG_ALL }, |
| 395 | { "challengeresponseauthentication", sChallengeResponseAuthentication, SSHCFG_GLOBAL }, |
| 396 | { "skeyauthentication", sChallengeResponseAuthentication, SSHCFG_GLOBAL }, /* alias */ |
| 397 | #ifdef JPAKE |
| 398 | { "zeroknowledgepasswordauthentication", sZeroKnowledgePasswordAuthentication, SSHCFG_ALL }, |
| 399 | #else |
| 400 | { "zeroknowledgepasswordauthentication", sUnsupported, SSHCFG_ALL }, |
| 401 | #endif |
| 402 | { "checkmail", sDeprecated, SSHCFG_GLOBAL }, |
| 403 | { "listenaddress", sListenAddress, SSHCFG_GLOBAL }, |
| 404 | { "addressfamily", sAddressFamily, SSHCFG_GLOBAL }, |
| 405 | { "printmotd", sPrintMotd, SSHCFG_GLOBAL }, |
| 406 | { "printlastlog", sPrintLastLog, SSHCFG_GLOBAL }, |
| 407 | { "ignorerhosts", sIgnoreRhosts, SSHCFG_GLOBAL }, |
| 408 | { "ignoreuserknownhosts", sIgnoreUserKnownHosts, SSHCFG_GLOBAL }, |
| 409 | { "x11forwarding", sX11Forwarding, SSHCFG_ALL }, |
| 410 | { "x11displayoffset", sX11DisplayOffset, SSHCFG_ALL }, |
| 411 | { "x11uselocalhost", sX11UseLocalhost, SSHCFG_ALL }, |
| 412 | { "xauthlocation", sXAuthLocation, SSHCFG_GLOBAL }, |
| 413 | { "strictmodes", sStrictModes, SSHCFG_GLOBAL }, |
| 414 | { "permitemptypasswords", sEmptyPasswd, SSHCFG_ALL }, |
| 415 | { "permituserenvironment", sPermitUserEnvironment, SSHCFG_GLOBAL }, |
| 416 | { "uselogin", sUseLogin, SSHCFG_GLOBAL }, |
| 417 | { "compression", sCompression, SSHCFG_GLOBAL }, |
| 418 | { "tcpkeepalive", sTCPKeepAlive, SSHCFG_GLOBAL }, |
| 419 | { "keepalive", sTCPKeepAlive, SSHCFG_GLOBAL }, /* obsolete alias */ |
| 420 | { "allowtcpforwarding", sAllowTcpForwarding, SSHCFG_ALL }, |
| 421 | { "allowagentforwarding", sAllowAgentForwarding, SSHCFG_ALL }, |
| 422 | { "allowusers", sAllowUsers, SSHCFG_GLOBAL }, |
| 423 | { "denyusers", sDenyUsers, SSHCFG_GLOBAL }, |
| 424 | { "allowgroups", sAllowGroups, SSHCFG_GLOBAL }, |
| 425 | { "denygroups", sDenyGroups, SSHCFG_GLOBAL }, |
| 426 | { "ciphers", sCiphers, SSHCFG_GLOBAL }, |
| 427 | { "macs", sMacs, SSHCFG_GLOBAL }, |
| 428 | { "protocol", sProtocol, SSHCFG_GLOBAL }, |
| 429 | { "gatewayports", sGatewayPorts, SSHCFG_ALL }, |
| 430 | { "subsystem", sSubsystem, SSHCFG_GLOBAL }, |
| 431 | { "maxstartups", sMaxStartups, SSHCFG_GLOBAL }, |
| 432 | { "maxauthtries", sMaxAuthTries, SSHCFG_ALL }, |
| 433 | { "maxsessions", sMaxSessions, SSHCFG_ALL }, |
| 434 | { "banner", sBanner, SSHCFG_ALL }, |
| 435 | { "usedns", sUseDNS, SSHCFG_GLOBAL }, |
| 436 | { "verifyreversemapping", sDeprecated, SSHCFG_GLOBAL }, |
| 437 | { "reversemappingcheck", sDeprecated, SSHCFG_GLOBAL }, |
| 438 | { "clientaliveinterval", sClientAliveInterval, SSHCFG_GLOBAL }, |
| 439 | { "clientalivecountmax", sClientAliveCountMax, SSHCFG_GLOBAL }, |
| 440 | { "authorizedkeysfile", sAuthorizedKeysFile, SSHCFG_ALL }, |
| 441 | { "authorizedkeysfile2", sDeprecated, SSHCFG_ALL }, |
| 442 | { "useprivilegeseparation", sUsePrivilegeSeparation, SSHCFG_GLOBAL}, |
| 443 | { "acceptenv", sAcceptEnv, SSHCFG_GLOBAL }, |
| 444 | { "permittunnel", sPermitTunnel, SSHCFG_ALL }, |
| 445 | { "match", sMatch, SSHCFG_ALL }, |
| 446 | { "permitopen", sPermitOpen, SSHCFG_ALL }, |
| 447 | { "forcecommand", sForceCommand, SSHCFG_ALL }, |
| 448 | { "chrootdirectory", sChrootDirectory, SSHCFG_ALL }, |
| 449 | { "hostcertificate", sHostCertificate, SSHCFG_GLOBAL }, |
| 450 | { "revokedkeys", sRevokedKeys, SSHCFG_ALL }, |
| 451 | { "trustedusercakeys", sTrustedUserCAKeys, SSHCFG_ALL }, |
| 452 | { "authorizedprincipalsfile", sAuthorizedPrincipalsFile, SSHCFG_ALL }, |
| 453 | { "kexalgorithms", sKexAlgorithms, SSHCFG_GLOBAL }, |
| 454 | { "ipqos", sIPQoS, SSHCFG_ALL }, |
| 455 | { NULL, sBadOption, 0 } |
| 456 | }; |
| 457 | |
| 458 | static struct { |
| 459 | int val; |
| 460 | char *text; |
| 461 | } tunmode_desc[] = { |
| 462 | { SSH_TUNMODE_NO, "no" }, |
| 463 | { SSH_TUNMODE_POINTOPOINT, "point-to-point" }, |
| 464 | { SSH_TUNMODE_ETHERNET, "ethernet" }, |
| 465 | { SSH_TUNMODE_YES, "yes" }, |
| 466 | { -1, NULL } |
| 467 | }; |
| 468 | |
| 469 | /* |
| 470 | * Returns the number of the token pointed to by cp or sBadOption. |
| 471 | */ |
| 472 | |
| 473 | static ServerOpCodes |
| 474 | parse_token(const char *cp, const char *filename, |
| 475 | int linenum, u_int *flags) |
| 476 | { |
| 477 | u_int i; |
| 478 | |
| 479 | for (i = 0; keywords[i].name; i++) |
| 480 | if (strcasecmp(cp, keywords[i].name) == 0) { |
| 481 | *flags = keywords[i].flags; |
| 482 | return keywords[i].opcode; |
| 483 | } |
| 484 | |
| 485 | error("%s: line %d: Bad configuration option: %s", |
| 486 | filename, linenum, cp); |
| 487 | return sBadOption; |
| 488 | } |
| 489 | |
| 490 | char * |
| 491 | derelativise_path(const char *path) |
| 492 | { |
| 493 | char *expanded, *ret, cwd[MAXPATHLEN]; |
| 494 | |
| 495 | expanded = tilde_expand_filename(path, getuid()); |
| 496 | if (*expanded == '/') |
| 497 | return expanded; |
| 498 | if (getcwd(cwd, sizeof(cwd)) == NULL) |
| 499 | fatal("%s: getcwd: %s", __func__, strerror(errno)); |
| 500 | xasprintf(&ret, "%s/%s", cwd, expanded); |
| 501 | xfree(expanded); |
| 502 | return ret; |
| 503 | } |
| 504 | |
| 505 | static void |
| 506 | add_listen_addr(ServerOptions *options, char *addr, int port) |
| 507 | { |
| 508 | u_int i; |
| 509 | |
| 510 | if (options->num_ports == 0) |
| 511 | options->ports[options->num_ports++] = SSH_DEFAULT_PORT; |
| 512 | if (options->address_family == -1) |
| 513 | options->address_family = AF_UNSPEC; |
| 514 | if (port == 0) |
| 515 | for (i = 0; i < options->num_ports; i++) |
| 516 | add_one_listen_addr(options, addr, options->ports[i]); |
| 517 | else |
| 518 | add_one_listen_addr(options, addr, port); |
| 519 | } |
| 520 | |
| 521 | static void |
| 522 | add_one_listen_addr(ServerOptions *options, char *addr, int port) |
| 523 | { |
| 524 | struct addrinfo hints, *ai, *aitop; |
| 525 | char strport[NI_MAXSERV]; |
| 526 | int gaierr; |
| 527 | |
| 528 | memset(&hints, 0, sizeof(hints)); |
| 529 | hints.ai_family = options->address_family; |
| 530 | hints.ai_socktype = SOCK_STREAM; |
| 531 | hints.ai_flags = (addr == NULL) ? AI_PASSIVE : 0; |
| 532 | snprintf(strport, sizeof strport, "%d", port); |
| 533 | if ((gaierr = getaddrinfo(addr, strport, &hints, &aitop)) != 0) |
| 534 | fatal("bad addr or host: %s (%s)", |
| 535 | addr ? addr : "<NULL>", |
| 536 | ssh_gai_strerror(gaierr)); |
| 537 | for (ai = aitop; ai->ai_next; ai = ai->ai_next) |
| 538 | ; |
| 539 | ai->ai_next = options->listen_addrs; |
| 540 | options->listen_addrs = aitop; |
| 541 | } |
| 542 | |
| 543 | /* |
| 544 | * The strategy for the Match blocks is that the config file is parsed twice. |
| 545 | * |
| 546 | * The first time is at startup. activep is initialized to 1 and the |
| 547 | * directives in the global context are processed and acted on. Hitting a |
| 548 | * Match directive unsets activep and the directives inside the block are |
| 549 | * checked for syntax only. |
| 550 | * |
| 551 | * The second time is after a connection has been established but before |
| 552 | * authentication. activep is initialized to 2 and global config directives |
| 553 | * are ignored since they have already been processed. If the criteria in a |
| 554 | * Match block is met, activep is set and the subsequent directives |
| 555 | * processed and actioned until EOF or another Match block unsets it. Any |
| 556 | * options set are copied into the main server config. |
| 557 | * |
| 558 | * Potential additions/improvements: |
| 559 | * - Add Match support for pre-kex directives, eg Protocol, Ciphers. |
| 560 | * |
| 561 | * - Add a Tag directive (idea from David Leonard) ala pf, eg: |
| 562 | * Match Address 192.168.0.* |
| 563 | * Tag trusted |
| 564 | * Match Group wheel |
| 565 | * Tag trusted |
| 566 | * Match Tag trusted |
| 567 | * AllowTcpForwarding yes |
| 568 | * GatewayPorts clientspecified |
| 569 | * [...] |
| 570 | * |
| 571 | * - Add a PermittedChannelRequests directive |
| 572 | * Match Group shell |
| 573 | * PermittedChannelRequests session,forwarded-tcpip |
| 574 | */ |
| 575 | |
| 576 | static int |
| 577 | match_cfg_line_group(const char *grps, int line, const char *user) |
| 578 | { |
| 579 | int result = 0; |
| 580 | struct passwd *pw; |
| 581 | |
| 582 | if (user == NULL) |
| 583 | goto out; |
| 584 | |
| 585 | if ((pw = getpwnam(user)) == NULL) { |
| 586 | debug("Can't match group at line %d because user %.100s does " |
| 587 | "not exist", line, user); |
| 588 | } else if (ga_init(pw->pw_name, pw->pw_gid) == 0) { |
| 589 | debug("Can't Match group because user %.100s not in any group " |
| 590 | "at line %d", user, line); |
| 591 | } else if (ga_match_pattern_list(grps) != 1) { |
| 592 | debug("user %.100s does not match group list %.100s at line %d", |
| 593 | user, grps, line); |
| 594 | } else { |
| 595 | debug("user %.100s matched group list %.100s at line %d", user, |
| 596 | grps, line); |
| 597 | result = 1; |
| 598 | } |
| 599 | out: |
| 600 | ga_free(); |
| 601 | return result; |
| 602 | } |
| 603 | |
| 604 | static int |
| 605 | match_cfg_line(char **condition, int line, const char *user, const char *host, |
| 606 | const char *address) |
| 607 | { |
| 608 | int result = 1; |
| 609 | char *arg, *attrib, *cp = *condition; |
| 610 | size_t len; |
| 611 | |
| 612 | if (user == NULL) |
| 613 | debug3("checking syntax for 'Match %s'", cp); |
| 614 | else |
| 615 | debug3("checking match for '%s' user %s host %s addr %s", cp, |
| 616 | user ? user : "(null)", host ? host : "(null)", |
| 617 | address ? address : "(null)"); |
| 618 | |
| 619 | while ((attrib = strdelim(&cp)) && *attrib != '\0') { |
| 620 | if ((arg = strdelim(&cp)) == NULL || *arg == '\0') { |
| 621 | error("Missing Match criteria for %s", attrib); |
| 622 | return -1; |
| 623 | } |
| 624 | len = strlen(arg); |
| 625 | if (strcasecmp(attrib, "user") == 0) { |
| 626 | if (!user) { |
| 627 | result = 0; |
| 628 | continue; |
| 629 | } |
| 630 | if (match_pattern_list(user, arg, len, 0) != 1) |
| 631 | result = 0; |
| 632 | else |
| 633 | debug("user %.100s matched 'User %.100s' at " |
| 634 | "line %d", user, arg, line); |
| 635 | } else if (strcasecmp(attrib, "group") == 0) { |
| 636 | switch (match_cfg_line_group(arg, line, user)) { |
| 637 | case -1: |
| 638 | return -1; |
| 639 | case 0: |
| 640 | result = 0; |
| 641 | } |
| 642 | } else if (strcasecmp(attrib, "host") == 0) { |
| 643 | if (!host) { |
| 644 | result = 0; |
| 645 | continue; |
| 646 | } |
| 647 | if (match_hostname(host, arg, len) != 1) |
| 648 | result = 0; |
| 649 | else |
| 650 | debug("connection from %.100s matched 'Host " |
| 651 | "%.100s' at line %d", host, arg, line); |
| 652 | } else if (strcasecmp(attrib, "address") == 0) { |
| 653 | switch (addr_match_list(address, arg)) { |
| 654 | case 1: |
| 655 | debug("connection from %.100s matched 'Address " |
| 656 | "%.100s' at line %d", address, arg, line); |
| 657 | break; |
| 658 | case 0: |
| 659 | case -1: |
| 660 | result = 0; |
| 661 | break; |
| 662 | case -2: |
| 663 | return -1; |
| 664 | } |
| 665 | } else { |
| 666 | error("Unsupported Match attribute %s", attrib); |
| 667 | return -1; |
| 668 | } |
| 669 | } |
| 670 | if (user != NULL) |
| 671 | debug3("match %sfound", result ? "" : "not "); |
| 672 | *condition = cp; |
| 673 | return result; |
| 674 | } |
| 675 | |
| 676 | #define WHITESPACE " \t\r\n" |
| 677 | |
| 678 | /* Multistate option parsing */ |
| 679 | struct multistate { |
| 680 | char *key; |
| 681 | int value; |
| 682 | }; |
| 683 | static const struct multistate multistate_addressfamily[] = { |
| 684 | { "inet", AF_INET }, |
| 685 | { "inet6", AF_INET6 }, |
| 686 | { "any", AF_UNSPEC }, |
| 687 | { NULL, -1 } |
| 688 | }; |
| 689 | static const struct multistate multistate_permitrootlogin[] = { |
| 690 | { "without-password", PERMIT_NO_PASSWD }, |
| 691 | { "forced-commands-only", PERMIT_FORCED_ONLY }, |
| 692 | { "yes", PERMIT_YES }, |
| 693 | { "no", PERMIT_NO }, |
| 694 | { NULL, -1 } |
| 695 | }; |
| 696 | static const struct multistate multistate_compression[] = { |
| 697 | { "delayed", COMP_DELAYED }, |
| 698 | { "yes", COMP_ZLIB }, |
| 699 | { "no", COMP_NONE }, |
| 700 | { NULL, -1 } |
| 701 | }; |
| 702 | static const struct multistate multistate_gatewayports[] = { |
| 703 | { "clientspecified", 2 }, |
| 704 | { "yes", 1 }, |
| 705 | { "no", 0 }, |
| 706 | { NULL, -1 } |
| 707 | }; |
| 708 | static const struct multistate multistate_privsep[] = { |
| 709 | { "sandbox", PRIVSEP_SANDBOX }, |
| 710 | { "yes", PRIVSEP_ON }, |
| 711 | { "no", PRIVSEP_OFF }, |
| 712 | { NULL, -1 } |
| 713 | }; |
| 714 | |
| 715 | int |
| 716 | process_server_config_line(ServerOptions *options, char *line, |
| 717 | const char *filename, int linenum, int *activep, const char *user, |
| 718 | const char *host, const char *address) |
| 719 | { |
| 720 | char *cp, **charptr, *arg, *p; |
| 721 | int cmdline = 0, *intptr, value, value2, n; |
| 722 | SyslogFacility *log_facility_ptr; |
| 723 | LogLevel *log_level_ptr; |
| 724 | ServerOpCodes opcode; |
| 725 | int port; |
| 726 | u_int i, flags = 0; |
| 727 | size_t len; |
| 728 | const struct multistate *multistate_ptr; |
| 729 | |
| 730 | cp = line; |
| 731 | if ((arg = strdelim(&cp)) == NULL) |
| 732 | return 0; |
| 733 | /* Ignore leading whitespace */ |
| 734 | if (*arg == '\0') |
| 735 | arg = strdelim(&cp); |
| 736 | if (!arg || !*arg || *arg == '#') |
| 737 | return 0; |
| 738 | intptr = NULL; |
| 739 | charptr = NULL; |
| 740 | opcode = parse_token(arg, filename, linenum, &flags); |
| 741 | |
| 742 | if (activep == NULL) { /* We are processing a command line directive */ |
| 743 | cmdline = 1; |
| 744 | activep = &cmdline; |
| 745 | } |
| 746 | if (*activep && opcode != sMatch) |
| 747 | debug3("%s:%d setting %s %s", filename, linenum, arg, cp); |
| 748 | if (*activep == 0 && !(flags & SSHCFG_MATCH)) { |
| 749 | if (user == NULL) { |
| 750 | fatal("%s line %d: Directive '%s' is not allowed " |
| 751 | "within a Match block", filename, linenum, arg); |
| 752 | } else { /* this is a directive we have already processed */ |
| 753 | while (arg) |
| 754 | arg = strdelim(&cp); |
| 755 | return 0; |
| 756 | } |
| 757 | } |
| 758 | |
| 759 | switch (opcode) { |
| 760 | /* Portable-specific options */ |
| 761 | case sUsePAM: |
| 762 | intptr = &options->use_pam; |
| 763 | goto parse_flag; |
| 764 | |
| 765 | /* Standard Options */ |
| 766 | case sBadOption: |
| 767 | return -1; |
| 768 | case sPort: |
| 769 | /* ignore ports from configfile if cmdline specifies ports */ |
| 770 | if (options->ports_from_cmdline) |
| 771 | return 0; |
| 772 | if (options->listen_addrs != NULL) |
| 773 | fatal("%s line %d: ports must be specified before " |
| 774 | "ListenAddress.", filename, linenum); |
| 775 | if (options->num_ports >= MAX_PORTS) |
| 776 | fatal("%s line %d: too many ports.", |
| 777 | filename, linenum); |
| 778 | arg = strdelim(&cp); |
| 779 | if (!arg || *arg == '\0') |
| 780 | fatal("%s line %d: missing port number.", |
| 781 | filename, linenum); |
| 782 | options->ports[options->num_ports++] = a2port(arg); |
| 783 | if (options->ports[options->num_ports-1] <= 0) |
| 784 | fatal("%s line %d: Badly formatted port number.", |
| 785 | filename, linenum); |
| 786 | break; |
| 787 | |
| 788 | case sServerKeyBits: |
| 789 | intptr = &options->server_key_bits; |
| 790 | parse_int: |
| 791 | arg = strdelim(&cp); |
| 792 | if (!arg || *arg == '\0') |
| 793 | fatal("%s line %d: missing integer value.", |
| 794 | filename, linenum); |
| 795 | value = atoi(arg); |
| 796 | if (*activep && *intptr == -1) |
| 797 | *intptr = value; |
| 798 | break; |
| 799 | |
| 800 | case sLoginGraceTime: |
| 801 | intptr = &options->login_grace_time; |
| 802 | parse_time: |
| 803 | arg = strdelim(&cp); |
| 804 | if (!arg || *arg == '\0') |
| 805 | fatal("%s line %d: missing time value.", |
| 806 | filename, linenum); |
| 807 | if ((value = convtime(arg)) == -1) |
| 808 | fatal("%s line %d: invalid time value.", |
| 809 | filename, linenum); |
| 810 | if (*intptr == -1) |
| 811 | *intptr = value; |
| 812 | break; |
| 813 | |
| 814 | case sKeyRegenerationTime: |
| 815 | intptr = &options->key_regeneration_time; |
| 816 | goto parse_time; |
| 817 | |
| 818 | case sListenAddress: |
| 819 | arg = strdelim(&cp); |
| 820 | if (arg == NULL || *arg == '\0') |
| 821 | fatal("%s line %d: missing address", |
| 822 | filename, linenum); |
| 823 | /* check for bare IPv6 address: no "[]" and 2 or more ":" */ |
| 824 | if (strchr(arg, '[') == NULL && (p = strchr(arg, ':')) != NULL |
| 825 | && strchr(p+1, ':') != NULL) { |
| 826 | add_listen_addr(options, arg, 0); |
| 827 | break; |
| 828 | } |
| 829 | p = hpdelim(&arg); |
| 830 | if (p == NULL) |
| 831 | fatal("%s line %d: bad address:port usage", |
| 832 | filename, linenum); |
| 833 | p = cleanhostname(p); |
| 834 | if (arg == NULL) |
| 835 | port = 0; |
| 836 | else if ((port = a2port(arg)) <= 0) |
| 837 | fatal("%s line %d: bad port number", filename, linenum); |
| 838 | |
| 839 | add_listen_addr(options, p, port); |
| 840 | |
| 841 | break; |
| 842 | |
| 843 | case sAddressFamily: |
| 844 | intptr = &options->address_family; |
| 845 | multistate_ptr = multistate_addressfamily; |
| 846 | if (options->listen_addrs != NULL) |
| 847 | fatal("%s line %d: address family must be specified " |
| 848 | "before ListenAddress.", filename, linenum); |
| 849 | parse_multistate: |
| 850 | arg = strdelim(&cp); |
| 851 | if (!arg || *arg == '\0') |
| 852 | fatal("%s line %d: missing argument.", |
| 853 | filename, linenum); |
| 854 | value = -1; |
| 855 | for (i = 0; multistate_ptr[i].key != NULL; i++) { |
| 856 | if (strcasecmp(arg, multistate_ptr[i].key) == 0) { |
| 857 | value = multistate_ptr[i].value; |
| 858 | break; |
| 859 | } |
| 860 | } |
| 861 | if (value == -1) |
| 862 | fatal("%s line %d: unsupported option \"%s\".", |
| 863 | filename, linenum, arg); |
| 864 | if (*activep && *intptr == -1) |
| 865 | *intptr = value; |
| 866 | break; |
| 867 | |
| 868 | case sHostKeyFile: |
| 869 | intptr = &options->num_host_key_files; |
| 870 | if (*intptr >= MAX_HOSTKEYS) |
| 871 | fatal("%s line %d: too many host keys specified (max %d).", |
| 872 | filename, linenum, MAX_HOSTKEYS); |
| 873 | charptr = &options->host_key_files[*intptr]; |
| 874 | parse_filename: |
| 875 | arg = strdelim(&cp); |
| 876 | if (!arg || *arg == '\0') |
| 877 | fatal("%s line %d: missing file name.", |
| 878 | filename, linenum); |
| 879 | if (*activep && *charptr == NULL) { |
| 880 | *charptr = derelativise_path(arg); |
| 881 | /* increase optional counter */ |
| 882 | if (intptr != NULL) |
| 883 | *intptr = *intptr + 1; |
| 884 | } |
| 885 | break; |
| 886 | |
| 887 | case sHostCertificate: |
| 888 | intptr = &options->num_host_cert_files; |
| 889 | if (*intptr >= MAX_HOSTKEYS) |
| 890 | fatal("%s line %d: too many host certificates " |
| 891 | "specified (max %d).", filename, linenum, |
| 892 | MAX_HOSTCERTS); |
| 893 | charptr = &options->host_cert_files[*intptr]; |
| 894 | goto parse_filename; |
| 895 | break; |
| 896 | |
| 897 | case sPidFile: |
| 898 | charptr = &options->pid_file; |
| 899 | goto parse_filename; |
| 900 | |
| 901 | case sPermitRootLogin: |
| 902 | intptr = &options->permit_root_login; |
| 903 | multistate_ptr = multistate_permitrootlogin; |
| 904 | goto parse_multistate; |
| 905 | |
| 906 | case sIgnoreRhosts: |
| 907 | intptr = &options->ignore_rhosts; |
| 908 | parse_flag: |
| 909 | arg = strdelim(&cp); |
| 910 | if (!arg || *arg == '\0') |
| 911 | fatal("%s line %d: missing yes/no argument.", |
| 912 | filename, linenum); |
| 913 | value = 0; /* silence compiler */ |
| 914 | if (strcmp(arg, "yes") == 0) |
| 915 | value = 1; |
| 916 | else if (strcmp(arg, "no") == 0) |
| 917 | value = 0; |
| 918 | else |
| 919 | fatal("%s line %d: Bad yes/no argument: %s", |
| 920 | filename, linenum, arg); |
| 921 | if (*activep && *intptr == -1) |
| 922 | *intptr = value; |
| 923 | break; |
| 924 | |
| 925 | case sIgnoreUserKnownHosts: |
| 926 | intptr = &options->ignore_user_known_hosts; |
| 927 | goto parse_flag; |
| 928 | |
| 929 | case sRhostsRSAAuthentication: |
| 930 | intptr = &options->rhosts_rsa_authentication; |
| 931 | goto parse_flag; |
| 932 | |
| 933 | case sHostbasedAuthentication: |
| 934 | intptr = &options->hostbased_authentication; |
| 935 | goto parse_flag; |
| 936 | |
| 937 | case sHostbasedUsesNameFromPacketOnly: |
| 938 | intptr = &options->hostbased_uses_name_from_packet_only; |
| 939 | goto parse_flag; |
| 940 | |
| 941 | case sRSAAuthentication: |
| 942 | intptr = &options->rsa_authentication; |
| 943 | goto parse_flag; |
| 944 | |
| 945 | case sPubkeyAuthentication: |
| 946 | intptr = &options->pubkey_authentication; |
| 947 | goto parse_flag; |
| 948 | |
| 949 | case sKerberosAuthentication: |
| 950 | intptr = &options->kerberos_authentication; |
| 951 | goto parse_flag; |
| 952 | |
| 953 | case sKerberosOrLocalPasswd: |
| 954 | intptr = &options->kerberos_or_local_passwd; |
| 955 | goto parse_flag; |
| 956 | |
| 957 | case sKerberosTicketCleanup: |
| 958 | intptr = &options->kerberos_ticket_cleanup; |
| 959 | goto parse_flag; |
| 960 | |
| 961 | case sKerberosGetAFSToken: |
| 962 | intptr = &options->kerberos_get_afs_token; |
| 963 | goto parse_flag; |
| 964 | |
| 965 | case sGssAuthentication: |
| 966 | intptr = &options->gss_authentication; |
| 967 | goto parse_flag; |
| 968 | |
| 969 | case sGssCleanupCreds: |
| 970 | intptr = &options->gss_cleanup_creds; |
| 971 | goto parse_flag; |
| 972 | |
| 973 | case sPasswordAuthentication: |
| 974 | intptr = &options->password_authentication; |
| 975 | goto parse_flag; |
| 976 | |
| 977 | case sZeroKnowledgePasswordAuthentication: |
| 978 | intptr = &options->zero_knowledge_password_authentication; |
| 979 | goto parse_flag; |
| 980 | |
| 981 | case sKbdInteractiveAuthentication: |
| 982 | intptr = &options->kbd_interactive_authentication; |
| 983 | goto parse_flag; |
| 984 | |
| 985 | case sChallengeResponseAuthentication: |
| 986 | intptr = &options->challenge_response_authentication; |
| 987 | goto parse_flag; |
| 988 | |
| 989 | case sPrintMotd: |
| 990 | intptr = &options->print_motd; |
| 991 | goto parse_flag; |
| 992 | |
| 993 | case sPrintLastLog: |
| 994 | intptr = &options->print_lastlog; |
| 995 | goto parse_flag; |
| 996 | |
| 997 | case sX11Forwarding: |
| 998 | intptr = &options->x11_forwarding; |
| 999 | goto parse_flag; |
| 1000 | |
| 1001 | case sX11DisplayOffset: |
| 1002 | intptr = &options->x11_display_offset; |
| 1003 | goto parse_int; |
| 1004 | |
| 1005 | case sX11UseLocalhost: |
| 1006 | intptr = &options->x11_use_localhost; |
| 1007 | goto parse_flag; |
| 1008 | |
| 1009 | case sXAuthLocation: |
| 1010 | charptr = &options->xauth_location; |
| 1011 | goto parse_filename; |
| 1012 | |
| 1013 | case sStrictModes: |
| 1014 | intptr = &options->strict_modes; |
| 1015 | goto parse_flag; |
| 1016 | |
| 1017 | case sTCPKeepAlive: |
| 1018 | intptr = &options->tcp_keep_alive; |
| 1019 | goto parse_flag; |
| 1020 | |
| 1021 | case sEmptyPasswd: |
| 1022 | intptr = &options->permit_empty_passwd; |
| 1023 | goto parse_flag; |
| 1024 | |
| 1025 | case sPermitUserEnvironment: |
| 1026 | intptr = &options->permit_user_env; |
| 1027 | goto parse_flag; |
| 1028 | |
| 1029 | case sUseLogin: |
| 1030 | intptr = &options->use_login; |
| 1031 | goto parse_flag; |
| 1032 | |
| 1033 | case sCompression: |
| 1034 | intptr = &options->compression; |
| 1035 | multistate_ptr = multistate_compression; |
| 1036 | goto parse_multistate; |
| 1037 | |
| 1038 | case sGatewayPorts: |
| 1039 | intptr = &options->gateway_ports; |
| 1040 | multistate_ptr = multistate_gatewayports; |
| 1041 | goto parse_multistate; |
| 1042 | |
| 1043 | case sUseDNS: |
| 1044 | intptr = &options->use_dns; |
| 1045 | goto parse_flag; |
| 1046 | |
| 1047 | case sLogFacility: |
| 1048 | log_facility_ptr = &options->log_facility; |
| 1049 | arg = strdelim(&cp); |
| 1050 | value = log_facility_number(arg); |
| 1051 | if (value == SYSLOG_FACILITY_NOT_SET) |
| 1052 | fatal("%.200s line %d: unsupported log facility '%s'", |
| 1053 | filename, linenum, arg ? arg : "<NONE>"); |
| 1054 | if (*log_facility_ptr == -1) |
| 1055 | *log_facility_ptr = (SyslogFacility) value; |
| 1056 | break; |
| 1057 | |
| 1058 | case sLogLevel: |
| 1059 | log_level_ptr = &options->log_level; |
| 1060 | arg = strdelim(&cp); |
| 1061 | value = log_level_number(arg); |
| 1062 | if (value == SYSLOG_LEVEL_NOT_SET) |
| 1063 | fatal("%.200s line %d: unsupported log level '%s'", |
| 1064 | filename, linenum, arg ? arg : "<NONE>"); |
| 1065 | if (*log_level_ptr == -1) |
| 1066 | *log_level_ptr = (LogLevel) value; |
| 1067 | break; |
| 1068 | |
| 1069 | case sAllowTcpForwarding: |
| 1070 | intptr = &options->allow_tcp_forwarding; |
| 1071 | goto parse_flag; |
| 1072 | |
| 1073 | case sAllowAgentForwarding: |
| 1074 | intptr = &options->allow_agent_forwarding; |
| 1075 | goto parse_flag; |
| 1076 | |
| 1077 | case sUsePrivilegeSeparation: |
| 1078 | intptr = &use_privsep; |
| 1079 | multistate_ptr = multistate_privsep; |
| 1080 | goto parse_multistate; |
| 1081 | |
| 1082 | case sAllowUsers: |
| 1083 | while ((arg = strdelim(&cp)) && *arg != '\0') { |
| 1084 | if (options->num_allow_users >= MAX_ALLOW_USERS) |
| 1085 | fatal("%s line %d: too many allow users.", |
| 1086 | filename, linenum); |
| 1087 | options->allow_users[options->num_allow_users++] = |
| 1088 | xstrdup(arg); |
| 1089 | } |
| 1090 | break; |
| 1091 | |
| 1092 | case sDenyUsers: |
| 1093 | while ((arg = strdelim(&cp)) && *arg != '\0') { |
| 1094 | if (options->num_deny_users >= MAX_DENY_USERS) |
| 1095 | fatal("%s line %d: too many deny users.", |
| 1096 | filename, linenum); |
| 1097 | options->deny_users[options->num_deny_users++] = |
| 1098 | xstrdup(arg); |
| 1099 | } |
| 1100 | break; |
| 1101 | |
| 1102 | case sAllowGroups: |
| 1103 | while ((arg = strdelim(&cp)) && *arg != '\0') { |
| 1104 | if (options->num_allow_groups >= MAX_ALLOW_GROUPS) |
| 1105 | fatal("%s line %d: too many allow groups.", |
| 1106 | filename, linenum); |
| 1107 | options->allow_groups[options->num_allow_groups++] = |
| 1108 | xstrdup(arg); |
| 1109 | } |
| 1110 | break; |
| 1111 | |
| 1112 | case sDenyGroups: |
| 1113 | while ((arg = strdelim(&cp)) && *arg != '\0') { |
| 1114 | if (options->num_deny_groups >= MAX_DENY_GROUPS) |
| 1115 | fatal("%s line %d: too many deny groups.", |
| 1116 | filename, linenum); |
| 1117 | options->deny_groups[options->num_deny_groups++] = xstrdup(arg); |
| 1118 | } |
| 1119 | break; |
| 1120 | |
| 1121 | case sCiphers: |
| 1122 | arg = strdelim(&cp); |
| 1123 | if (!arg || *arg == '\0') |
| 1124 | fatal("%s line %d: Missing argument.", filename, linenum); |
| 1125 | if (!ciphers_valid(arg)) |
| 1126 | fatal("%s line %d: Bad SSH2 cipher spec '%s'.", |
| 1127 | filename, linenum, arg ? arg : "<NONE>"); |
| 1128 | if (options->ciphers == NULL) |
| 1129 | options->ciphers = xstrdup(arg); |
| 1130 | break; |
| 1131 | |
| 1132 | case sMacs: |
| 1133 | arg = strdelim(&cp); |
| 1134 | if (!arg || *arg == '\0') |
| 1135 | fatal("%s line %d: Missing argument.", filename, linenum); |
| 1136 | if (!mac_valid(arg)) |
| 1137 | fatal("%s line %d: Bad SSH2 mac spec '%s'.", |
| 1138 | filename, linenum, arg ? arg : "<NONE>"); |
| 1139 | if (options->macs == NULL) |
| 1140 | options->macs = xstrdup(arg); |
| 1141 | break; |
| 1142 | |
| 1143 | case sKexAlgorithms: |
| 1144 | arg = strdelim(&cp); |
| 1145 | if (!arg || *arg == '\0') |
| 1146 | fatal("%s line %d: Missing argument.", |
| 1147 | filename, linenum); |
| 1148 | if (!kex_names_valid(arg)) |
| 1149 | fatal("%s line %d: Bad SSH2 KexAlgorithms '%s'.", |
| 1150 | filename, linenum, arg ? arg : "<NONE>"); |
| 1151 | if (options->kex_algorithms == NULL) |
| 1152 | options->kex_algorithms = xstrdup(arg); |
| 1153 | break; |
| 1154 | |
| 1155 | case sProtocol: |
| 1156 | intptr = &options->protocol; |
| 1157 | arg = strdelim(&cp); |
| 1158 | if (!arg || *arg == '\0') |
| 1159 | fatal("%s line %d: Missing argument.", filename, linenum); |
| 1160 | value = proto_spec(arg); |
| 1161 | if (value == SSH_PROTO_UNKNOWN) |
| 1162 | fatal("%s line %d: Bad protocol spec '%s'.", |
| 1163 | filename, linenum, arg ? arg : "<NONE>"); |
| 1164 | if (*intptr == SSH_PROTO_UNKNOWN) |
| 1165 | *intptr = value; |
| 1166 | break; |
| 1167 | |
| 1168 | case sSubsystem: |
| 1169 | if (options->num_subsystems >= MAX_SUBSYSTEMS) { |
| 1170 | fatal("%s line %d: too many subsystems defined.", |
| 1171 | filename, linenum); |
| 1172 | } |
| 1173 | arg = strdelim(&cp); |
| 1174 | if (!arg || *arg == '\0') |
| 1175 | fatal("%s line %d: Missing subsystem name.", |
| 1176 | filename, linenum); |
| 1177 | if (!*activep) { |
| 1178 | arg = strdelim(&cp); |
| 1179 | break; |
| 1180 | } |
| 1181 | for (i = 0; i < options->num_subsystems; i++) |
| 1182 | if (strcmp(arg, options->subsystem_name[i]) == 0) |
| 1183 | fatal("%s line %d: Subsystem '%s' already defined.", |
| 1184 | filename, linenum, arg); |
| 1185 | options->subsystem_name[options->num_subsystems] = xstrdup(arg); |
| 1186 | arg = strdelim(&cp); |
| 1187 | if (!arg || *arg == '\0') |
| 1188 | fatal("%s line %d: Missing subsystem command.", |
| 1189 | filename, linenum); |
| 1190 | options->subsystem_command[options->num_subsystems] = xstrdup(arg); |
| 1191 | |
| 1192 | /* Collect arguments (separate to executable) */ |
| 1193 | p = xstrdup(arg); |
| 1194 | len = strlen(p) + 1; |
| 1195 | while ((arg = strdelim(&cp)) != NULL && *arg != '\0') { |
| 1196 | len += 1 + strlen(arg); |
| 1197 | p = xrealloc(p, 1, len); |
| 1198 | strlcat(p, " ", len); |
| 1199 | strlcat(p, arg, len); |
| 1200 | } |
| 1201 | options->subsystem_args[options->num_subsystems] = p; |
| 1202 | options->num_subsystems++; |
| 1203 | break; |
| 1204 | |
| 1205 | case sMaxStartups: |
| 1206 | arg = strdelim(&cp); |
| 1207 | if (!arg || *arg == '\0') |
| 1208 | fatal("%s line %d: Missing MaxStartups spec.", |
| 1209 | filename, linenum); |
| 1210 | if ((n = sscanf(arg, "%d:%d:%d", |
| 1211 | &options->max_startups_begin, |
| 1212 | &options->max_startups_rate, |
| 1213 | &options->max_startups)) == 3) { |
| 1214 | if (options->max_startups_begin > |
| 1215 | options->max_startups || |
| 1216 | options->max_startups_rate > 100 || |
| 1217 | options->max_startups_rate < 1) |
| 1218 | fatal("%s line %d: Illegal MaxStartups spec.", |
| 1219 | filename, linenum); |
| 1220 | } else if (n != 1) |
| 1221 | fatal("%s line %d: Illegal MaxStartups spec.", |
| 1222 | filename, linenum); |
| 1223 | else |
| 1224 | options->max_startups = options->max_startups_begin; |
| 1225 | break; |
| 1226 | |
| 1227 | case sMaxAuthTries: |
| 1228 | intptr = &options->max_authtries; |
| 1229 | goto parse_int; |
| 1230 | |
| 1231 | case sMaxSessions: |
| 1232 | intptr = &options->max_sessions; |
| 1233 | goto parse_int; |
| 1234 | |
| 1235 | case sBanner: |
| 1236 | charptr = &options->banner; |
| 1237 | goto parse_filename; |
| 1238 | |
| 1239 | /* |
| 1240 | * These options can contain %X options expanded at |
| 1241 | * connect time, so that you can specify paths like: |
| 1242 | * |
| 1243 | * AuthorizedKeysFile /etc/ssh_keys/%u |
| 1244 | */ |
| 1245 | case sAuthorizedKeysFile: |
| 1246 | if (*activep && options->num_authkeys_files == 0) { |
| 1247 | while ((arg = strdelim(&cp)) && *arg != '\0') { |
| 1248 | if (options->num_authkeys_files >= |
| 1249 | MAX_AUTHKEYS_FILES) |
| 1250 | fatal("%s line %d: " |
| 1251 | "too many authorized keys files.", |
| 1252 | filename, linenum); |
| 1253 | options->authorized_keys_files[ |
| 1254 | options->num_authkeys_files++] = |
| 1255 | tilde_expand_filename(arg, getuid()); |
| 1256 | } |
| 1257 | } |
| 1258 | return 0; |
| 1259 | |
| 1260 | case sAuthorizedPrincipalsFile: |
| 1261 | charptr = &options->authorized_principals_file; |
| 1262 | arg = strdelim(&cp); |
| 1263 | if (!arg || *arg == '\0') |
| 1264 | fatal("%s line %d: missing file name.", |
| 1265 | filename, linenum); |
| 1266 | if (*activep && *charptr == NULL) { |
| 1267 | *charptr = tilde_expand_filename(arg, getuid()); |
| 1268 | /* increase optional counter */ |
| 1269 | if (intptr != NULL) |
| 1270 | *intptr = *intptr + 1; |
| 1271 | } |
| 1272 | break; |
| 1273 | |
| 1274 | case sClientAliveInterval: |
| 1275 | intptr = &options->client_alive_interval; |
| 1276 | goto parse_time; |
| 1277 | |
| 1278 | case sClientAliveCountMax: |
| 1279 | intptr = &options->client_alive_count_max; |
| 1280 | goto parse_int; |
| 1281 | |
| 1282 | case sAcceptEnv: |
| 1283 | while ((arg = strdelim(&cp)) && *arg != '\0') { |
| 1284 | if (strchr(arg, '=') != NULL) |
| 1285 | fatal("%s line %d: Invalid environment name.", |
| 1286 | filename, linenum); |
| 1287 | if (options->num_accept_env >= MAX_ACCEPT_ENV) |
| 1288 | fatal("%s line %d: too many allow env.", |
| 1289 | filename, linenum); |
| 1290 | if (!*activep) |
| 1291 | break; |
| 1292 | options->accept_env[options->num_accept_env++] = |
| 1293 | xstrdup(arg); |
| 1294 | } |
| 1295 | break; |
| 1296 | |
| 1297 | case sPermitTunnel: |
| 1298 | intptr = &options->permit_tun; |
| 1299 | arg = strdelim(&cp); |
| 1300 | if (!arg || *arg == '\0') |
| 1301 | fatal("%s line %d: Missing yes/point-to-point/" |
| 1302 | "ethernet/no argument.", filename, linenum); |
| 1303 | value = -1; |
| 1304 | for (i = 0; tunmode_desc[i].val != -1; i++) |
| 1305 | if (strcmp(tunmode_desc[i].text, arg) == 0) { |
| 1306 | value = tunmode_desc[i].val; |
| 1307 | break; |
| 1308 | } |
| 1309 | if (value == -1) |
| 1310 | fatal("%s line %d: Bad yes/point-to-point/ethernet/" |
| 1311 | "no argument: %s", filename, linenum, arg); |
| 1312 | if (*intptr == -1) |
| 1313 | *intptr = value; |
| 1314 | break; |
| 1315 | |
| 1316 | case sMatch: |
| 1317 | if (cmdline) |
| 1318 | fatal("Match directive not supported as a command-line " |
| 1319 | "option"); |
| 1320 | value = match_cfg_line(&cp, linenum, user, host, address); |
| 1321 | if (value < 0) |
| 1322 | fatal("%s line %d: Bad Match condition", filename, |
| 1323 | linenum); |
| 1324 | *activep = value; |
| 1325 | break; |
| 1326 | |
| 1327 | case sPermitOpen: |
| 1328 | arg = strdelim(&cp); |
| 1329 | if (!arg || *arg == '\0') |
| 1330 | fatal("%s line %d: missing PermitOpen specification", |
| 1331 | filename, linenum); |
| 1332 | n = options->num_permitted_opens; /* modified later */ |
| 1333 | if (strcmp(arg, "any") == 0) { |
| 1334 | if (*activep && n == -1) { |
| 1335 | channel_clear_adm_permitted_opens(); |
| 1336 | options->num_permitted_opens = 0; |
| 1337 | } |
| 1338 | break; |
| 1339 | } |
| 1340 | if (*activep && n == -1) |
| 1341 | channel_clear_adm_permitted_opens(); |
| 1342 | for (; arg != NULL && *arg != '\0'; arg = strdelim(&cp)) { |
| 1343 | p = hpdelim(&arg); |
| 1344 | if (p == NULL) |
| 1345 | fatal("%s line %d: missing host in PermitOpen", |
| 1346 | filename, linenum); |
| 1347 | p = cleanhostname(p); |
| 1348 | if (arg == NULL || (port = a2port(arg)) <= 0) |
| 1349 | fatal("%s line %d: bad port number in " |
| 1350 | "PermitOpen", filename, linenum); |
| 1351 | if (*activep && n == -1) |
| 1352 | options->num_permitted_opens = |
| 1353 | channel_add_adm_permitted_opens(p, port); |
| 1354 | } |
| 1355 | break; |
| 1356 | |
| 1357 | case sForceCommand: |
| 1358 | if (cp == NULL) |
| 1359 | fatal("%.200s line %d: Missing argument.", filename, |
| 1360 | linenum); |
| 1361 | len = strspn(cp, WHITESPACE); |
| 1362 | if (*activep && options->adm_forced_command == NULL) |
| 1363 | options->adm_forced_command = xstrdup(cp + len); |
| 1364 | return 0; |
| 1365 | |
| 1366 | case sChrootDirectory: |
| 1367 | charptr = &options->chroot_directory; |
| 1368 | |
| 1369 | arg = strdelim(&cp); |
| 1370 | if (!arg || *arg == '\0') |
| 1371 | fatal("%s line %d: missing file name.", |
| 1372 | filename, linenum); |
| 1373 | if (*activep && *charptr == NULL) |
| 1374 | *charptr = xstrdup(arg); |
| 1375 | break; |
| 1376 | |
| 1377 | case sTrustedUserCAKeys: |
| 1378 | charptr = &options->trusted_user_ca_keys; |
| 1379 | goto parse_filename; |
| 1380 | |
| 1381 | case sRevokedKeys: |
| 1382 | charptr = &options->revoked_keys_file; |
| 1383 | goto parse_filename; |
| 1384 | |
| 1385 | case sIPQoS: |
| 1386 | arg = strdelim(&cp); |
| 1387 | if ((value = parse_ipqos(arg)) == -1) |
| 1388 | fatal("%s line %d: Bad IPQoS value: %s", |
| 1389 | filename, linenum, arg); |
| 1390 | arg = strdelim(&cp); |
| 1391 | if (arg == NULL) |
| 1392 | value2 = value; |
| 1393 | else if ((value2 = parse_ipqos(arg)) == -1) |
| 1394 | fatal("%s line %d: Bad IPQoS value: %s", |
| 1395 | filename, linenum, arg); |
| 1396 | if (*activep) { |
| 1397 | options->ip_qos_interactive = value; |
| 1398 | options->ip_qos_bulk = value2; |
| 1399 | } |
| 1400 | break; |
| 1401 | |
| 1402 | case sDeprecated: |
| 1403 | logit("%s line %d: Deprecated option %s", |
| 1404 | filename, linenum, arg); |
| 1405 | while (arg) |
| 1406 | arg = strdelim(&cp); |
| 1407 | break; |
| 1408 | |
| 1409 | case sUnsupported: |
| 1410 | logit("%s line %d: Unsupported option %s", |
| 1411 | filename, linenum, arg); |
| 1412 | while (arg) |
| 1413 | arg = strdelim(&cp); |
| 1414 | break; |
| 1415 | |
| 1416 | default: |
| 1417 | fatal("%s line %d: Missing handler for opcode %s (%d)", |
| 1418 | filename, linenum, arg, opcode); |
| 1419 | } |
| 1420 | if ((arg = strdelim(&cp)) != NULL && *arg != '\0') |
| 1421 | fatal("%s line %d: garbage at end of line; \"%.200s\".", |
| 1422 | filename, linenum, arg); |
| 1423 | return 0; |
| 1424 | } |
| 1425 | |
| 1426 | /* Reads the server configuration file. */ |
| 1427 | |
| 1428 | void |
| 1429 | load_server_config(const char *filename, Buffer *conf) |
| 1430 | { |
| 1431 | char line[1024], *cp; |
| 1432 | FILE *f; |
| 1433 | |
| 1434 | debug2("%s: filename %s", __func__, filename); |
| 1435 | if ((f = fopen(filename, "r")) == NULL) { |
| 1436 | perror(filename); |
| 1437 | exit(1); |
| 1438 | } |
| 1439 | buffer_clear(conf); |
| 1440 | while (fgets(line, sizeof(line), f)) { |
| 1441 | /* |
| 1442 | * Trim out comments and strip whitespace |
| 1443 | * NB - preserve newlines, they are needed to reproduce |
| 1444 | * line numbers later for error messages |
| 1445 | */ |
| 1446 | if ((cp = strchr(line, '#')) != NULL) |
| 1447 | memcpy(cp, "\n", 2); |
| 1448 | cp = line + strspn(line, " \t\r"); |
| 1449 | |
| 1450 | buffer_append(conf, cp, strlen(cp)); |
| 1451 | } |
| 1452 | buffer_append(conf, "\0", 1); |
| 1453 | fclose(f); |
| 1454 | debug2("%s: done config len = %d", __func__, buffer_len(conf)); |
| 1455 | } |
| 1456 | |
| 1457 | void |
| 1458 | parse_server_match_config(ServerOptions *options, const char *user, |
| 1459 | const char *host, const char *address) |
| 1460 | { |
| 1461 | ServerOptions mo; |
| 1462 | #ifdef ANDROID |
| 1463 | char value[PROPERTY_VALUE_MAX]; |
| 1464 | #endif |
| 1465 | |
| 1466 | initialize_server_options(&mo); |
| 1467 | parse_server_config(&mo, "reprocess config", &cfg, user, host, address); |
| 1468 | #ifdef ANDROID |
| 1469 | /* Allow root login if ro.debuggable is set */ |
| 1470 | property_get("ro.debuggable", value, ""); |
| 1471 | if (strcmp(value, "1") == 0) |
| 1472 | mo.permit_root_login = PERMIT_YES; |
| 1473 | #endif |
| 1474 | copy_set_server_options(options, &mo, 0); |
| 1475 | } |
| 1476 | |
| 1477 | /* Helper macros */ |
| 1478 | #define M_CP_INTOPT(n) do {\ |
| 1479 | if (src->n != -1) \ |
| 1480 | dst->n = src->n; \ |
| 1481 | } while (0) |
| 1482 | #define M_CP_STROPT(n) do {\ |
| 1483 | if (src->n != NULL) { \ |
| 1484 | if (dst->n != NULL) \ |
| 1485 | xfree(dst->n); \ |
| 1486 | dst->n = src->n; \ |
| 1487 | } \ |
| 1488 | } while(0) |
| 1489 | #define M_CP_STRARRAYOPT(n, num_n) do {\ |
| 1490 | if (src->num_n != 0) { \ |
| 1491 | for (dst->num_n = 0; dst->num_n < src->num_n; dst->num_n++) \ |
| 1492 | dst->n[dst->num_n] = xstrdup(src->n[dst->num_n]); \ |
| 1493 | } \ |
| 1494 | } while(0) |
| 1495 | |
| 1496 | /* |
| 1497 | * Copy any supported values that are set. |
| 1498 | * |
| 1499 | * If the preauth flag is set, we do not bother copying the string or |
| 1500 | * array values that are not used pre-authentication, because any that we |
| 1501 | * do use must be explictly sent in mm_getpwnamallow(). |
| 1502 | */ |
| 1503 | void |
| 1504 | copy_set_server_options(ServerOptions *dst, ServerOptions *src, int preauth) |
| 1505 | { |
| 1506 | M_CP_INTOPT(password_authentication); |
| 1507 | M_CP_INTOPT(gss_authentication); |
| 1508 | M_CP_INTOPT(rsa_authentication); |
| 1509 | M_CP_INTOPT(pubkey_authentication); |
| 1510 | M_CP_INTOPT(kerberos_authentication); |
| 1511 | M_CP_INTOPT(hostbased_authentication); |
| 1512 | M_CP_INTOPT(hostbased_uses_name_from_packet_only); |
| 1513 | M_CP_INTOPT(kbd_interactive_authentication); |
| 1514 | M_CP_INTOPT(zero_knowledge_password_authentication); |
| 1515 | M_CP_INTOPT(permit_root_login); |
| 1516 | M_CP_INTOPT(permit_empty_passwd); |
| 1517 | |
| 1518 | M_CP_INTOPT(allow_tcp_forwarding); |
| 1519 | M_CP_INTOPT(allow_agent_forwarding); |
| 1520 | M_CP_INTOPT(permit_tun); |
| 1521 | M_CP_INTOPT(gateway_ports); |
| 1522 | M_CP_INTOPT(x11_display_offset); |
| 1523 | M_CP_INTOPT(x11_forwarding); |
| 1524 | M_CP_INTOPT(x11_use_localhost); |
| 1525 | M_CP_INTOPT(max_sessions); |
| 1526 | M_CP_INTOPT(max_authtries); |
| 1527 | M_CP_INTOPT(ip_qos_interactive); |
| 1528 | M_CP_INTOPT(ip_qos_bulk); |
| 1529 | |
| 1530 | /* See comment in servconf.h */ |
| 1531 | COPY_MATCH_STRING_OPTS(); |
| 1532 | |
| 1533 | /* |
| 1534 | * The only things that should be below this point are string options |
| 1535 | * which are only used after authentication. |
| 1536 | */ |
| 1537 | if (preauth) |
| 1538 | return; |
| 1539 | |
| 1540 | M_CP_STROPT(adm_forced_command); |
| 1541 | M_CP_STROPT(chroot_directory); |
| 1542 | } |
| 1543 | |
| 1544 | #undef M_CP_INTOPT |
| 1545 | #undef M_CP_STROPT |
| 1546 | #undef M_CP_STRARRAYOPT |
| 1547 | |
| 1548 | void |
| 1549 | parse_server_config(ServerOptions *options, const char *filename, Buffer *conf, |
| 1550 | const char *user, const char *host, const char *address) |
| 1551 | { |
| 1552 | int active, linenum, bad_options = 0; |
| 1553 | char *cp, *obuf, *cbuf; |
| 1554 | |
| 1555 | debug2("%s: config %s len %d", __func__, filename, buffer_len(conf)); |
| 1556 | |
| 1557 | obuf = cbuf = xstrdup(buffer_ptr(conf)); |
| 1558 | active = user ? 0 : 1; |
| 1559 | linenum = 1; |
| 1560 | while ((cp = strsep(&cbuf, "\n")) != NULL) { |
| 1561 | if (process_server_config_line(options, cp, filename, |
| 1562 | linenum++, &active, user, host, address) != 0) |
| 1563 | bad_options++; |
| 1564 | } |
| 1565 | xfree(obuf); |
| 1566 | if (bad_options > 0) |
| 1567 | fatal("%s: terminating, %d bad configuration options", |
| 1568 | filename, bad_options); |
| 1569 | } |
| 1570 | |
| 1571 | static const char * |
| 1572 | fmt_multistate_int(int val, const struct multistate *m) |
| 1573 | { |
| 1574 | u_int i; |
| 1575 | |
| 1576 | for (i = 0; m[i].key != NULL; i++) { |
| 1577 | if (m[i].value == val) |
| 1578 | return m[i].key; |
| 1579 | } |
| 1580 | return "UNKNOWN"; |
| 1581 | } |
| 1582 | |
| 1583 | static const char * |
| 1584 | fmt_intarg(ServerOpCodes code, int val) |
| 1585 | { |
| 1586 | if (val == -1) |
| 1587 | return "unset"; |
| 1588 | switch (code) { |
| 1589 | case sAddressFamily: |
| 1590 | return fmt_multistate_int(val, multistate_addressfamily); |
| 1591 | case sPermitRootLogin: |
| 1592 | return fmt_multistate_int(val, multistate_permitrootlogin); |
| 1593 | case sGatewayPorts: |
| 1594 | return fmt_multistate_int(val, multistate_gatewayports); |
| 1595 | case sCompression: |
| 1596 | return fmt_multistate_int(val, multistate_compression); |
| 1597 | case sUsePrivilegeSeparation: |
| 1598 | return fmt_multistate_int(val, multistate_privsep); |
| 1599 | case sProtocol: |
| 1600 | switch (val) { |
| 1601 | case SSH_PROTO_1: |
| 1602 | return "1"; |
| 1603 | case SSH_PROTO_2: |
| 1604 | return "2"; |
| 1605 | case (SSH_PROTO_1|SSH_PROTO_2): |
| 1606 | return "2,1"; |
| 1607 | default: |
| 1608 | return "UNKNOWN"; |
| 1609 | } |
| 1610 | default: |
| 1611 | switch (val) { |
| 1612 | case 0: |
| 1613 | return "no"; |
| 1614 | case 1: |
| 1615 | return "yes"; |
| 1616 | default: |
| 1617 | return "UNKNOWN"; |
| 1618 | } |
| 1619 | } |
| 1620 | } |
| 1621 | |
| 1622 | static const char * |
| 1623 | lookup_opcode_name(ServerOpCodes code) |
| 1624 | { |
| 1625 | u_int i; |
| 1626 | |
| 1627 | for (i = 0; keywords[i].name != NULL; i++) |
| 1628 | if (keywords[i].opcode == code) |
| 1629 | return(keywords[i].name); |
| 1630 | return "UNKNOWN"; |
| 1631 | } |
| 1632 | |
| 1633 | static void |
| 1634 | dump_cfg_int(ServerOpCodes code, int val) |
| 1635 | { |
| 1636 | printf("%s %d\n", lookup_opcode_name(code), val); |
| 1637 | } |
| 1638 | |
| 1639 | static void |
| 1640 | dump_cfg_fmtint(ServerOpCodes code, int val) |
| 1641 | { |
| 1642 | printf("%s %s\n", lookup_opcode_name(code), fmt_intarg(code, val)); |
| 1643 | } |
| 1644 | |
| 1645 | static void |
| 1646 | dump_cfg_string(ServerOpCodes code, const char *val) |
| 1647 | { |
| 1648 | if (val == NULL) |
| 1649 | return; |
| 1650 | printf("%s %s\n", lookup_opcode_name(code), val); |
| 1651 | } |
| 1652 | |
| 1653 | static void |
| 1654 | dump_cfg_strarray(ServerOpCodes code, u_int count, char **vals) |
| 1655 | { |
| 1656 | u_int i; |
| 1657 | |
| 1658 | for (i = 0; i < count; i++) |
| 1659 | printf("%s %s\n", lookup_opcode_name(code), vals[i]); |
| 1660 | } |
| 1661 | |
| 1662 | static void |
| 1663 | dump_cfg_strarray_oneline(ServerOpCodes code, u_int count, char **vals) |
| 1664 | { |
| 1665 | u_int i; |
| 1666 | |
| 1667 | printf("%s", lookup_opcode_name(code)); |
| 1668 | for (i = 0; i < count; i++) |
| 1669 | printf(" %s", vals[i]); |
| 1670 | printf("\n"); |
| 1671 | } |
| 1672 | |
| 1673 | void |
| 1674 | dump_config(ServerOptions *o) |
| 1675 | { |
| 1676 | u_int i; |
| 1677 | int ret; |
| 1678 | struct addrinfo *ai; |
| 1679 | char addr[NI_MAXHOST], port[NI_MAXSERV], *s = NULL; |
| 1680 | |
| 1681 | /* these are usually at the top of the config */ |
| 1682 | for (i = 0; i < o->num_ports; i++) |
| 1683 | printf("port %d\n", o->ports[i]); |
| 1684 | dump_cfg_fmtint(sProtocol, o->protocol); |
| 1685 | dump_cfg_fmtint(sAddressFamily, o->address_family); |
| 1686 | |
| 1687 | /* ListenAddress must be after Port */ |
| 1688 | for (ai = o->listen_addrs; ai; ai = ai->ai_next) { |
| 1689 | if ((ret = getnameinfo(ai->ai_addr, ai->ai_addrlen, addr, |
| 1690 | sizeof(addr), port, sizeof(port), |
| 1691 | NI_NUMERICHOST|NI_NUMERICSERV)) != 0) { |
| 1692 | error("getnameinfo failed: %.100s", |
| 1693 | (ret != EAI_SYSTEM) ? gai_strerror(ret) : |
| 1694 | strerror(errno)); |
| 1695 | } else { |
| 1696 | if (ai->ai_family == AF_INET6) |
| 1697 | printf("listenaddress [%s]:%s\n", addr, port); |
| 1698 | else |
| 1699 | printf("listenaddress %s:%s\n", addr, port); |
| 1700 | } |
| 1701 | } |
| 1702 | |
| 1703 | /* integer arguments */ |
| 1704 | #ifdef USE_PAM |
| 1705 | dump_cfg_int(sUsePAM, o->use_pam); |
| 1706 | #endif |
| 1707 | dump_cfg_int(sServerKeyBits, o->server_key_bits); |
| 1708 | dump_cfg_int(sLoginGraceTime, o->login_grace_time); |
| 1709 | dump_cfg_int(sKeyRegenerationTime, o->key_regeneration_time); |
| 1710 | dump_cfg_int(sX11DisplayOffset, o->x11_display_offset); |
| 1711 | dump_cfg_int(sMaxAuthTries, o->max_authtries); |
| 1712 | dump_cfg_int(sMaxSessions, o->max_sessions); |
| 1713 | dump_cfg_int(sClientAliveInterval, o->client_alive_interval); |
| 1714 | dump_cfg_int(sClientAliveCountMax, o->client_alive_count_max); |
| 1715 | |
| 1716 | /* formatted integer arguments */ |
| 1717 | dump_cfg_fmtint(sPermitRootLogin, o->permit_root_login); |
| 1718 | dump_cfg_fmtint(sIgnoreRhosts, o->ignore_rhosts); |
| 1719 | dump_cfg_fmtint(sIgnoreUserKnownHosts, o->ignore_user_known_hosts); |
| 1720 | dump_cfg_fmtint(sRhostsRSAAuthentication, o->rhosts_rsa_authentication); |
| 1721 | dump_cfg_fmtint(sHostbasedAuthentication, o->hostbased_authentication); |
| 1722 | dump_cfg_fmtint(sHostbasedUsesNameFromPacketOnly, |
| 1723 | o->hostbased_uses_name_from_packet_only); |
| 1724 | dump_cfg_fmtint(sRSAAuthentication, o->rsa_authentication); |
| 1725 | dump_cfg_fmtint(sPubkeyAuthentication, o->pubkey_authentication); |
| 1726 | #ifdef KRB5 |
| 1727 | dump_cfg_fmtint(sKerberosAuthentication, o->kerberos_authentication); |
| 1728 | dump_cfg_fmtint(sKerberosOrLocalPasswd, o->kerberos_or_local_passwd); |
| 1729 | dump_cfg_fmtint(sKerberosTicketCleanup, o->kerberos_ticket_cleanup); |
| 1730 | # ifdef USE_AFS |
| 1731 | dump_cfg_fmtint(sKerberosGetAFSToken, o->kerberos_get_afs_token); |
| 1732 | # endif |
| 1733 | #endif |
| 1734 | #ifdef GSSAPI |
| 1735 | dump_cfg_fmtint(sGssAuthentication, o->gss_authentication); |
| 1736 | dump_cfg_fmtint(sGssCleanupCreds, o->gss_cleanup_creds); |
| 1737 | #endif |
| 1738 | #ifdef JPAKE |
| 1739 | dump_cfg_fmtint(sZeroKnowledgePasswordAuthentication, |
| 1740 | o->zero_knowledge_password_authentication); |
| 1741 | #endif |
| 1742 | dump_cfg_fmtint(sPasswordAuthentication, o->password_authentication); |
| 1743 | dump_cfg_fmtint(sKbdInteractiveAuthentication, |
| 1744 | o->kbd_interactive_authentication); |
| 1745 | dump_cfg_fmtint(sChallengeResponseAuthentication, |
| 1746 | o->challenge_response_authentication); |
| 1747 | dump_cfg_fmtint(sPrintMotd, o->print_motd); |
| 1748 | dump_cfg_fmtint(sPrintLastLog, o->print_lastlog); |
| 1749 | dump_cfg_fmtint(sX11Forwarding, o->x11_forwarding); |
| 1750 | dump_cfg_fmtint(sX11UseLocalhost, o->x11_use_localhost); |
| 1751 | dump_cfg_fmtint(sStrictModes, o->strict_modes); |
| 1752 | dump_cfg_fmtint(sTCPKeepAlive, o->tcp_keep_alive); |
| 1753 | dump_cfg_fmtint(sEmptyPasswd, o->permit_empty_passwd); |
| 1754 | dump_cfg_fmtint(sPermitUserEnvironment, o->permit_user_env); |
| 1755 | dump_cfg_fmtint(sUseLogin, o->use_login); |
| 1756 | dump_cfg_fmtint(sCompression, o->compression); |
| 1757 | dump_cfg_fmtint(sGatewayPorts, o->gateway_ports); |
| 1758 | dump_cfg_fmtint(sUseDNS, o->use_dns); |
| 1759 | dump_cfg_fmtint(sAllowTcpForwarding, o->allow_tcp_forwarding); |
| 1760 | dump_cfg_fmtint(sUsePrivilegeSeparation, use_privsep); |
| 1761 | |
| 1762 | /* string arguments */ |
| 1763 | dump_cfg_string(sPidFile, o->pid_file); |
| 1764 | dump_cfg_string(sXAuthLocation, o->xauth_location); |
| 1765 | dump_cfg_string(sCiphers, o->ciphers); |
| 1766 | dump_cfg_string(sMacs, o->macs); |
| 1767 | dump_cfg_string(sBanner, o->banner); |
| 1768 | dump_cfg_string(sForceCommand, o->adm_forced_command); |
| 1769 | dump_cfg_string(sChrootDirectory, o->chroot_directory); |
| 1770 | dump_cfg_string(sTrustedUserCAKeys, o->trusted_user_ca_keys); |
| 1771 | dump_cfg_string(sRevokedKeys, o->revoked_keys_file); |
| 1772 | dump_cfg_string(sAuthorizedPrincipalsFile, |
| 1773 | o->authorized_principals_file); |
| 1774 | |
| 1775 | /* string arguments requiring a lookup */ |
| 1776 | dump_cfg_string(sLogLevel, log_level_name(o->log_level)); |
| 1777 | dump_cfg_string(sLogFacility, log_facility_name(o->log_facility)); |
| 1778 | |
| 1779 | /* string array arguments */ |
| 1780 | dump_cfg_strarray_oneline(sAuthorizedKeysFile, o->num_authkeys_files, |
| 1781 | o->authorized_keys_files); |
| 1782 | dump_cfg_strarray(sHostKeyFile, o->num_host_key_files, |
| 1783 | o->host_key_files); |
| 1784 | dump_cfg_strarray(sHostKeyFile, o->num_host_cert_files, |
| 1785 | o->host_cert_files); |
| 1786 | dump_cfg_strarray(sAllowUsers, o->num_allow_users, o->allow_users); |
| 1787 | dump_cfg_strarray(sDenyUsers, o->num_deny_users, o->deny_users); |
| 1788 | dump_cfg_strarray(sAllowGroups, o->num_allow_groups, o->allow_groups); |
| 1789 | dump_cfg_strarray(sDenyGroups, o->num_deny_groups, o->deny_groups); |
| 1790 | dump_cfg_strarray(sAcceptEnv, o->num_accept_env, o->accept_env); |
| 1791 | |
| 1792 | /* other arguments */ |
| 1793 | for (i = 0; i < o->num_subsystems; i++) |
| 1794 | printf("subsystem %s %s\n", o->subsystem_name[i], |
| 1795 | o->subsystem_args[i]); |
| 1796 | |
| 1797 | printf("maxstartups %d:%d:%d\n", o->max_startups_begin, |
| 1798 | o->max_startups_rate, o->max_startups); |
| 1799 | |
| 1800 | for (i = 0; tunmode_desc[i].val != -1; i++) |
| 1801 | if (tunmode_desc[i].val == o->permit_tun) { |
| 1802 | s = tunmode_desc[i].text; |
| 1803 | break; |
| 1804 | } |
| 1805 | dump_cfg_string(sPermitTunnel, s); |
| 1806 | |
| 1807 | printf("ipqos %s ", iptos2str(o->ip_qos_interactive)); |
| 1808 | printf("%s\n", iptos2str(o->ip_qos_bulk)); |
| 1809 | |
| 1810 | channel_print_adm_permitted_opens(); |
| 1811 | } |