| 1 | |
| 2 | /* $OpenBSD: servconf.c,v 1.350 2019/03/25 22:33:44 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 | |
| 16 | #include <sys/types.h> |
| 17 | #include <sys/socket.h> |
| 18 | #ifdef HAVE_SYS_SYSCTL_H |
| 19 | #include <sys/sysctl.h> |
| 20 | #endif |
| 21 | |
| 22 | #include <netinet/in.h> |
| 23 | #include <netinet/in_systm.h> |
| 24 | #include <netinet/ip.h> |
| 25 | #ifdef HAVE_NET_ROUTE_H |
| 26 | #include <net/route.h> |
| 27 | #endif |
| 28 | |
| 29 | #include <ctype.h> |
| 30 | #include <netdb.h> |
| 31 | #include <pwd.h> |
| 32 | #include <stdio.h> |
| 33 | #include <stdlib.h> |
| 34 | #include <string.h> |
| 35 | #include <signal.h> |
| 36 | #include <unistd.h> |
| 37 | #include <limits.h> |
| 38 | #include <stdarg.h> |
| 39 | #include <errno.h> |
| 40 | #ifdef HAVE_UTIL_H |
| 41 | #include <util.h> |
| 42 | #endif |
| 43 | |
| 44 | #include "openbsd-compat/sys-queue.h" |
| 45 | #include "xmalloc.h" |
| 46 | #include "ssh.h" |
| 47 | #include "log.h" |
| 48 | #include "sshbuf.h" |
| 49 | #include "misc.h" |
| 50 | #include "servconf.h" |
| 51 | #include "compat.h" |
| 52 | #include "pathnames.h" |
| 53 | #include "cipher.h" |
| 54 | #include "sshkey.h" |
| 55 | #include "kex.h" |
| 56 | #include "mac.h" |
| 57 | #include "match.h" |
| 58 | #include "channels.h" |
| 59 | #include "groupaccess.h" |
| 60 | #include "canohost.h" |
| 61 | #include "packet.h" |
| 62 | #include "ssherr.h" |
| 63 | #include "hostfile.h" |
| 64 | #include "auth.h" |
| 65 | #include "myproposal.h" |
| 66 | #include "digest.h" |
| 67 | |
| 68 | static void add_listen_addr(ServerOptions *, const char *, |
| 69 | const char *, int); |
| 70 | static void add_one_listen_addr(ServerOptions *, const char *, |
| 71 | const char *, int); |
| 72 | |
| 73 | /* Use of privilege separation or not */ |
| 74 | extern int use_privsep; |
| 75 | extern struct sshbuf *cfg; |
| 76 | |
| 77 | /* Initializes the server options to their default values. */ |
| 78 | |
| 79 | void |
| 80 | initialize_server_options(ServerOptions *options) |
| 81 | { |
| 82 | memset(options, 0, sizeof(*options)); |
| 83 | |
| 84 | /* Portable-specific options */ |
| 85 | options->use_pam = -1; |
| 86 | |
| 87 | /* Standard Options */ |
| 88 | options->num_ports = 0; |
| 89 | options->ports_from_cmdline = 0; |
| 90 | options->queued_listen_addrs = NULL; |
| 91 | options->num_queued_listens = 0; |
| 92 | options->listen_addrs = NULL; |
| 93 | options->num_listen_addrs = 0; |
| 94 | options->address_family = -1; |
| 95 | options->routing_domain = NULL; |
| 96 | options->num_host_key_files = 0; |
| 97 | options->num_host_cert_files = 0; |
| 98 | options->host_key_agent = NULL; |
| 99 | options->pid_file = NULL; |
| 100 | options->login_grace_time = -1; |
| 101 | options->permit_root_login = PERMIT_NOT_SET; |
| 102 | options->ignore_rhosts = -1; |
| 103 | options->ignore_user_known_hosts = -1; |
| 104 | options->print_motd = -1; |
| 105 | options->print_lastlog = -1; |
| 106 | options->x11_forwarding = -1; |
| 107 | options->x11_display_offset = -1; |
| 108 | options->x11_use_localhost = -1; |
| 109 | options->permit_tty = -1; |
| 110 | options->permit_user_rc = -1; |
| 111 | options->xauth_location = NULL; |
| 112 | options->strict_modes = -1; |
| 113 | options->tcp_keep_alive = -1; |
| 114 | options->log_facility = SYSLOG_FACILITY_NOT_SET; |
| 115 | options->log_level = SYSLOG_LEVEL_NOT_SET; |
| 116 | options->hostbased_authentication = -1; |
| 117 | options->hostbased_uses_name_from_packet_only = -1; |
| 118 | options->hostbased_key_types = NULL; |
| 119 | options->hostkeyalgorithms = NULL; |
| 120 | options->pubkey_authentication = -1; |
| 121 | options->pubkey_key_types = NULL; |
| 122 | options->kerberos_authentication = -1; |
| 123 | options->kerberos_or_local_passwd = -1; |
| 124 | options->kerberos_ticket_cleanup = -1; |
| 125 | options->kerberos_get_afs_token = -1; |
| 126 | options->gss_authentication=-1; |
| 127 | options->gss_cleanup_creds = -1; |
| 128 | options->gss_strict_acceptor = -1; |
| 129 | options->password_authentication = -1; |
| 130 | options->kbd_interactive_authentication = -1; |
| 131 | options->challenge_response_authentication = -1; |
| 132 | options->permit_empty_passwd = -1; |
| 133 | options->permit_user_env = -1; |
| 134 | options->permit_user_env_whitelist = NULL; |
| 135 | options->compression = -1; |
| 136 | options->rekey_limit = -1; |
| 137 | options->rekey_interval = -1; |
| 138 | options->allow_tcp_forwarding = -1; |
| 139 | options->allow_streamlocal_forwarding = -1; |
| 140 | options->allow_agent_forwarding = -1; |
| 141 | options->num_allow_users = 0; |
| 142 | options->num_deny_users = 0; |
| 143 | options->num_allow_groups = 0; |
| 144 | options->num_deny_groups = 0; |
| 145 | options->ciphers = NULL; |
| 146 | options->macs = NULL; |
| 147 | options->kex_algorithms = NULL; |
| 148 | options->ca_sign_algorithms = NULL; |
| 149 | options->fwd_opts.gateway_ports = -1; |
| 150 | options->fwd_opts.streamlocal_bind_mask = (mode_t)-1; |
| 151 | options->fwd_opts.streamlocal_bind_unlink = -1; |
| 152 | options->num_subsystems = 0; |
| 153 | options->max_startups_begin = -1; |
| 154 | options->max_startups_rate = -1; |
| 155 | options->max_startups = -1; |
| 156 | options->max_authtries = -1; |
| 157 | options->max_sessions = -1; |
| 158 | options->banner = NULL; |
| 159 | options->use_dns = -1; |
| 160 | options->client_alive_interval = -1; |
| 161 | options->client_alive_count_max = -1; |
| 162 | options->num_authkeys_files = 0; |
| 163 | options->num_accept_env = 0; |
| 164 | options->num_setenv = 0; |
| 165 | options->permit_tun = -1; |
| 166 | options->permitted_opens = NULL; |
| 167 | options->permitted_listens = NULL; |
| 168 | options->adm_forced_command = NULL; |
| 169 | options->chroot_directory = NULL; |
| 170 | options->authorized_keys_command = NULL; |
| 171 | options->authorized_keys_command_user = NULL; |
| 172 | options->revoked_keys_file = NULL; |
| 173 | options->trusted_user_ca_keys = NULL; |
| 174 | options->authorized_principals_file = NULL; |
| 175 | options->authorized_principals_command = NULL; |
| 176 | options->authorized_principals_command_user = NULL; |
| 177 | options->ip_qos_interactive = -1; |
| 178 | options->ip_qos_bulk = -1; |
| 179 | options->version_addendum = NULL; |
| 180 | options->fingerprint_hash = -1; |
| 181 | options->disable_forwarding = -1; |
| 182 | options->expose_userauth_info = -1; |
| 183 | } |
| 184 | |
| 185 | /* Returns 1 if a string option is unset or set to "none" or 0 otherwise. */ |
| 186 | static int |
| 187 | option_clear_or_none(const char *o) |
| 188 | { |
| 189 | return o == NULL || strcasecmp(o, "none") == 0; |
| 190 | } |
| 191 | |
| 192 | static void |
| 193 | assemble_algorithms(ServerOptions *o) |
| 194 | { |
| 195 | char *all_cipher, *all_mac, *all_kex, *all_key, *all_sig; |
| 196 | int r; |
| 197 | |
| 198 | all_cipher = cipher_alg_list(',', 0); |
| 199 | all_mac = mac_alg_list(','); |
| 200 | all_kex = kex_alg_list(','); |
| 201 | all_key = sshkey_alg_list(0, 0, 1, ','); |
| 202 | all_sig = sshkey_alg_list(0, 1, 1, ','); |
| 203 | #define ASSEMBLE(what, defaults, all) \ |
| 204 | do { \ |
| 205 | if ((r = kex_assemble_names(&o->what, defaults, all)) != 0) \ |
| 206 | fatal("%s: %s: %s", __func__, #what, ssh_err(r)); \ |
| 207 | } while (0) |
| 208 | ASSEMBLE(ciphers, KEX_SERVER_ENCRYPT, all_cipher); |
| 209 | ASSEMBLE(macs, KEX_SERVER_MAC, all_mac); |
| 210 | ASSEMBLE(kex_algorithms, KEX_SERVER_KEX, all_kex); |
| 211 | ASSEMBLE(hostkeyalgorithms, KEX_DEFAULT_PK_ALG, all_key); |
| 212 | ASSEMBLE(hostbased_key_types, KEX_DEFAULT_PK_ALG, all_key); |
| 213 | ASSEMBLE(pubkey_key_types, KEX_DEFAULT_PK_ALG, all_key); |
| 214 | ASSEMBLE(ca_sign_algorithms, SSH_ALLOWED_CA_SIGALGS, all_sig); |
| 215 | #undef ASSEMBLE |
| 216 | free(all_cipher); |
| 217 | free(all_mac); |
| 218 | free(all_kex); |
| 219 | free(all_key); |
| 220 | free(all_sig); |
| 221 | } |
| 222 | |
| 223 | static void |
| 224 | array_append2(const char *file, const int line, const char *directive, |
| 225 | char ***array, int **iarray, u_int *lp, const char *s, int i) |
| 226 | { |
| 227 | |
| 228 | if (*lp >= INT_MAX) |
| 229 | fatal("%s line %d: Too many %s entries", file, line, directive); |
| 230 | |
| 231 | if (iarray != NULL) { |
| 232 | *iarray = xrecallocarray(*iarray, *lp, *lp + 1, |
| 233 | sizeof(**iarray)); |
| 234 | (*iarray)[*lp] = i; |
| 235 | } |
| 236 | |
| 237 | *array = xrecallocarray(*array, *lp, *lp + 1, sizeof(**array)); |
| 238 | (*array)[*lp] = xstrdup(s); |
| 239 | (*lp)++; |
| 240 | } |
| 241 | |
| 242 | static void |
| 243 | array_append(const char *file, const int line, const char *directive, |
| 244 | char ***array, u_int *lp, const char *s) |
| 245 | { |
| 246 | array_append2(file, line, directive, array, NULL, lp, s, 0); |
| 247 | } |
| 248 | |
| 249 | void |
| 250 | servconf_add_hostkey(const char *file, const int line, |
| 251 | ServerOptions *options, const char *path, int userprovided) |
| 252 | { |
| 253 | char *apath = derelativise_path(path); |
| 254 | |
| 255 | array_append2(file, line, "HostKey", |
| 256 | &options->host_key_files, &options->host_key_file_userprovided, |
| 257 | &options->num_host_key_files, apath, userprovided); |
| 258 | free(apath); |
| 259 | } |
| 260 | |
| 261 | void |
| 262 | servconf_add_hostcert(const char *file, const int line, |
| 263 | ServerOptions *options, const char *path) |
| 264 | { |
| 265 | char *apath = derelativise_path(path); |
| 266 | |
| 267 | array_append(file, line, "HostCertificate", |
| 268 | &options->host_cert_files, &options->num_host_cert_files, apath); |
| 269 | free(apath); |
| 270 | } |
| 271 | |
| 272 | void |
| 273 | fill_default_server_options(ServerOptions *options) |
| 274 | { |
| 275 | u_int i; |
| 276 | |
| 277 | /* |
| 278 | * Portable-specific options. |
| 279 | * |
| 280 | * Please do NOT under any circumstances change the default to 1, |
| 281 | * for any reason. The use of PAM is not considered to be secure |
| 282 | * by default. |
| 283 | */ |
| 284 | if (options->use_pam == -1) |
| 285 | options->use_pam = 0; |
| 286 | |
| 287 | /* Standard Options */ |
| 288 | if (options->num_host_key_files == 0) { |
| 289 | /* fill default hostkeys for protocols */ |
| 290 | servconf_add_hostkey("[default]", 0, options, |
| 291 | _PATH_HOST_RSA_KEY_FILE, 0); |
| 292 | #ifdef OPENSSL_HAS_ECC |
| 293 | servconf_add_hostkey("[default]", 0, options, |
| 294 | _PATH_HOST_ECDSA_KEY_FILE, 0); |
| 295 | #endif |
| 296 | servconf_add_hostkey("[default]", 0, options, |
| 297 | _PATH_HOST_ED25519_KEY_FILE, 0); |
| 298 | #ifdef WITH_XMSS |
| 299 | servconf_add_hostkey("[default]", 0, options, |
| 300 | _PATH_HOST_XMSS_KEY_FILE, 0); |
| 301 | #endif /* WITH_XMSS */ |
| 302 | } |
| 303 | /* No certificates by default */ |
| 304 | if (options->num_ports == 0) |
| 305 | options->ports[options->num_ports++] = SSH_DEFAULT_PORT; |
| 306 | if (options->address_family == -1) |
| 307 | options->address_family = AF_UNSPEC; |
| 308 | if (options->listen_addrs == NULL) |
| 309 | add_listen_addr(options, NULL, NULL, 0); |
| 310 | if (options->pid_file == NULL) |
| 311 | options->pid_file = xstrdup(_PATH_SSH_DAEMON_PID_FILE); |
| 312 | if (options->login_grace_time == -1) |
| 313 | options->login_grace_time = 120; |
| 314 | if (options->permit_root_login == PERMIT_NOT_SET) |
| 315 | options->permit_root_login = PERMIT_NO_PASSWD; |
| 316 | if (options->ignore_rhosts == -1) |
| 317 | options->ignore_rhosts = 1; |
| 318 | if (options->ignore_user_known_hosts == -1) |
| 319 | options->ignore_user_known_hosts = 0; |
| 320 | if (options->print_motd == -1) |
| 321 | options->print_motd = 1; |
| 322 | if (options->print_lastlog == -1) |
| 323 | options->print_lastlog = 1; |
| 324 | if (options->x11_forwarding == -1) |
| 325 | options->x11_forwarding = 0; |
| 326 | if (options->x11_display_offset == -1) |
| 327 | options->x11_display_offset = 10; |
| 328 | if (options->x11_use_localhost == -1) |
| 329 | options->x11_use_localhost = 1; |
| 330 | if (options->xauth_location == NULL) |
| 331 | options->xauth_location = xstrdup(_PATH_XAUTH); |
| 332 | if (options->permit_tty == -1) |
| 333 | options->permit_tty = 1; |
| 334 | if (options->permit_user_rc == -1) |
| 335 | options->permit_user_rc = 1; |
| 336 | if (options->strict_modes == -1) |
| 337 | options->strict_modes = 1; |
| 338 | if (options->tcp_keep_alive == -1) |
| 339 | options->tcp_keep_alive = 1; |
| 340 | if (options->log_facility == SYSLOG_FACILITY_NOT_SET) |
| 341 | options->log_facility = SYSLOG_FACILITY_AUTH; |
| 342 | if (options->log_level == SYSLOG_LEVEL_NOT_SET) |
| 343 | options->log_level = SYSLOG_LEVEL_INFO; |
| 344 | if (options->hostbased_authentication == -1) |
| 345 | options->hostbased_authentication = 0; |
| 346 | if (options->hostbased_uses_name_from_packet_only == -1) |
| 347 | options->hostbased_uses_name_from_packet_only = 0; |
| 348 | if (options->pubkey_authentication == -1) |
| 349 | options->pubkey_authentication = 1; |
| 350 | if (options->kerberos_authentication == -1) |
| 351 | options->kerberos_authentication = 0; |
| 352 | if (options->kerberos_or_local_passwd == -1) |
| 353 | options->kerberos_or_local_passwd = 1; |
| 354 | if (options->kerberos_ticket_cleanup == -1) |
| 355 | options->kerberos_ticket_cleanup = 1; |
| 356 | if (options->kerberos_get_afs_token == -1) |
| 357 | options->kerberos_get_afs_token = 0; |
| 358 | if (options->gss_authentication == -1) |
| 359 | options->gss_authentication = 0; |
| 360 | if (options->gss_cleanup_creds == -1) |
| 361 | options->gss_cleanup_creds = 1; |
| 362 | if (options->gss_strict_acceptor == -1) |
| 363 | options->gss_strict_acceptor = 1; |
| 364 | /* |
| 365 | * Please do NOT under any circumstances change the default to 1, |
| 366 | * for any reason. The use of plaintext passwords are not considered |
| 367 | * secure by default. |
| 368 | */ |
| 369 | if (options->password_authentication == -1) |
| 370 | options->password_authentication = 0; |
| 371 | if (options->kbd_interactive_authentication == -1) |
| 372 | options->kbd_interactive_authentication = 0; |
| 373 | if (options->challenge_response_authentication == -1) |
| 374 | options->challenge_response_authentication = 1; |
| 375 | if (options->permit_empty_passwd == -1) |
| 376 | options->permit_empty_passwd = 0; |
| 377 | if (options->permit_user_env == -1) { |
| 378 | options->permit_user_env = 0; |
| 379 | options->permit_user_env_whitelist = NULL; |
| 380 | } |
| 381 | if (options->compression == -1) |
| 382 | options->compression = COMP_DELAYED; |
| 383 | if (options->rekey_limit == -1) |
| 384 | options->rekey_limit = 0; |
| 385 | if (options->rekey_interval == -1) |
| 386 | options->rekey_interval = 0; |
| 387 | if (options->allow_tcp_forwarding == -1) |
| 388 | options->allow_tcp_forwarding = FORWARD_ALLOW; |
| 389 | if (options->allow_streamlocal_forwarding == -1) |
| 390 | options->allow_streamlocal_forwarding = FORWARD_ALLOW; |
| 391 | if (options->allow_agent_forwarding == -1) |
| 392 | options->allow_agent_forwarding = 1; |
| 393 | if (options->fwd_opts.gateway_ports == -1) |
| 394 | options->fwd_opts.gateway_ports = 0; |
| 395 | if (options->max_startups == -1) |
| 396 | options->max_startups = 100; |
| 397 | if (options->max_startups_rate == -1) |
| 398 | options->max_startups_rate = 30; /* 30% */ |
| 399 | if (options->max_startups_begin == -1) |
| 400 | options->max_startups_begin = 10; |
| 401 | if (options->max_authtries == -1) |
| 402 | options->max_authtries = DEFAULT_AUTH_FAIL_MAX; |
| 403 | if (options->max_sessions == -1) |
| 404 | options->max_sessions = DEFAULT_SESSIONS_MAX; |
| 405 | if (options->use_dns == -1) |
| 406 | options->use_dns = 0; |
| 407 | if (options->client_alive_interval == -1) |
| 408 | options->client_alive_interval = 0; |
| 409 | if (options->client_alive_count_max == -1) |
| 410 | options->client_alive_count_max = 3; |
| 411 | if (options->num_authkeys_files == 0) { |
| 412 | array_append("[default]", 0, "AuthorizedKeysFiles", |
| 413 | &options->authorized_keys_files, |
| 414 | &options->num_authkeys_files, |
| 415 | _PATH_SSH_USER_PERMITTED_KEYS); |
| 416 | array_append("[default]", 0, "AuthorizedKeysFiles", |
| 417 | &options->authorized_keys_files, |
| 418 | &options->num_authkeys_files, |
| 419 | _PATH_SSH_USER_PERMITTED_KEYS2); |
| 420 | } |
| 421 | if (options->permit_tun == -1) |
| 422 | options->permit_tun = SSH_TUNMODE_NO; |
| 423 | if (options->ip_qos_interactive == -1) |
| 424 | options->ip_qos_interactive = IPTOS_DSCP_AF21; |
| 425 | if (options->ip_qos_bulk == -1) |
| 426 | options->ip_qos_bulk = IPTOS_DSCP_CS1; |
| 427 | if (options->version_addendum == NULL) |
| 428 | options->version_addendum = xstrdup(""); |
| 429 | if (options->fwd_opts.streamlocal_bind_mask == (mode_t)-1) |
| 430 | options->fwd_opts.streamlocal_bind_mask = 0177; |
| 431 | if (options->fwd_opts.streamlocal_bind_unlink == -1) |
| 432 | options->fwd_opts.streamlocal_bind_unlink = 0; |
| 433 | if (options->fingerprint_hash == -1) |
| 434 | options->fingerprint_hash = SSH_FP_HASH_DEFAULT; |
| 435 | if (options->disable_forwarding == -1) |
| 436 | options->disable_forwarding = 0; |
| 437 | if (options->expose_userauth_info == -1) |
| 438 | options->expose_userauth_info = 0; |
| 439 | |
| 440 | assemble_algorithms(options); |
| 441 | |
| 442 | /* Turn privilege separation and sandboxing on by default */ |
| 443 | if (use_privsep == -1) |
| 444 | use_privsep = PRIVSEP_ON; |
| 445 | |
| 446 | #define CLEAR_ON_NONE(v) \ |
| 447 | do { \ |
| 448 | if (option_clear_or_none(v)) { \ |
| 449 | free(v); \ |
| 450 | v = NULL; \ |
| 451 | } \ |
| 452 | } while(0) |
| 453 | CLEAR_ON_NONE(options->pid_file); |
| 454 | CLEAR_ON_NONE(options->xauth_location); |
| 455 | CLEAR_ON_NONE(options->banner); |
| 456 | CLEAR_ON_NONE(options->trusted_user_ca_keys); |
| 457 | CLEAR_ON_NONE(options->revoked_keys_file); |
| 458 | CLEAR_ON_NONE(options->authorized_principals_file); |
| 459 | CLEAR_ON_NONE(options->adm_forced_command); |
| 460 | CLEAR_ON_NONE(options->chroot_directory); |
| 461 | CLEAR_ON_NONE(options->routing_domain); |
| 462 | for (i = 0; i < options->num_host_key_files; i++) |
| 463 | CLEAR_ON_NONE(options->host_key_files[i]); |
| 464 | for (i = 0; i < options->num_host_cert_files; i++) |
| 465 | CLEAR_ON_NONE(options->host_cert_files[i]); |
| 466 | #undef CLEAR_ON_NONE |
| 467 | |
| 468 | /* Similar handling for AuthenticationMethods=any */ |
| 469 | if (options->num_auth_methods == 1 && |
| 470 | strcmp(options->auth_methods[0], "any") == 0) { |
| 471 | free(options->auth_methods[0]); |
| 472 | options->auth_methods[0] = NULL; |
| 473 | options->num_auth_methods = 0; |
| 474 | } |
| 475 | |
| 476 | #ifndef HAVE_MMAP |
| 477 | if (use_privsep && options->compression == 1) { |
| 478 | error("This platform does not support both privilege " |
| 479 | "separation and compression"); |
| 480 | error("Compression disabled"); |
| 481 | options->compression = 0; |
| 482 | } |
| 483 | #endif |
| 484 | } |
| 485 | |
| 486 | /* Keyword tokens. */ |
| 487 | typedef enum { |
| 488 | sBadOption, /* == unknown option */ |
| 489 | /* Portable-specific options */ |
| 490 | sUsePAM, |
| 491 | /* Standard Options */ |
| 492 | sPort, sHostKeyFile, sLoginGraceTime, |
| 493 | sPermitRootLogin, sLogFacility, sLogLevel, |
| 494 | sRhostsRSAAuthentication, sRSAAuthentication, |
| 495 | sKerberosAuthentication, sKerberosOrLocalPasswd, sKerberosTicketCleanup, |
| 496 | sKerberosGetAFSToken, sChallengeResponseAuthentication, |
| 497 | sPasswordAuthentication, sKbdInteractiveAuthentication, |
| 498 | sListenAddress, sAddressFamily, |
| 499 | sPrintMotd, sPrintLastLog, sIgnoreRhosts, |
| 500 | sX11Forwarding, sX11DisplayOffset, sX11UseLocalhost, |
| 501 | sPermitTTY, sStrictModes, sEmptyPasswd, sTCPKeepAlive, |
| 502 | sPermitUserEnvironment, sAllowTcpForwarding, sCompression, |
| 503 | sRekeyLimit, sAllowUsers, sDenyUsers, sAllowGroups, sDenyGroups, |
| 504 | sIgnoreUserKnownHosts, sCiphers, sMacs, sPidFile, |
| 505 | sGatewayPorts, sPubkeyAuthentication, sPubkeyAcceptedKeyTypes, |
| 506 | sXAuthLocation, sSubsystem, sMaxStartups, sMaxAuthTries, sMaxSessions, |
| 507 | sBanner, sUseDNS, sHostbasedAuthentication, |
| 508 | sHostbasedUsesNameFromPacketOnly, sHostbasedAcceptedKeyTypes, |
| 509 | sHostKeyAlgorithms, |
| 510 | sClientAliveInterval, sClientAliveCountMax, sAuthorizedKeysFile, |
| 511 | sGssAuthentication, sGssCleanupCreds, sGssStrictAcceptor, |
| 512 | sAcceptEnv, sSetEnv, sPermitTunnel, |
| 513 | sMatch, sPermitOpen, sPermitListen, sForceCommand, sChrootDirectory, |
| 514 | sUsePrivilegeSeparation, sAllowAgentForwarding, |
| 515 | sHostCertificate, |
| 516 | sRevokedKeys, sTrustedUserCAKeys, sAuthorizedPrincipalsFile, |
| 517 | sAuthorizedPrincipalsCommand, sAuthorizedPrincipalsCommandUser, |
| 518 | sKexAlgorithms, sCASignatureAlgorithms, sIPQoS, sVersionAddendum, |
| 519 | sAuthorizedKeysCommand, sAuthorizedKeysCommandUser, |
| 520 | sAuthenticationMethods, sHostKeyAgent, sPermitUserRC, |
| 521 | sStreamLocalBindMask, sStreamLocalBindUnlink, |
| 522 | sAllowStreamLocalForwarding, sFingerprintHash, sDisableForwarding, |
| 523 | sExposeAuthInfo, sRDomain, |
| 524 | sDeprecated, sIgnore, sUnsupported |
| 525 | } ServerOpCodes; |
| 526 | |
| 527 | #define SSHCFG_GLOBAL 0x01 /* allowed in main section of sshd_config */ |
| 528 | #define SSHCFG_MATCH 0x02 /* allowed inside a Match section */ |
| 529 | #define SSHCFG_ALL (SSHCFG_GLOBAL|SSHCFG_MATCH) |
| 530 | |
| 531 | /* Textual representation of the tokens. */ |
| 532 | static struct { |
| 533 | const char *name; |
| 534 | ServerOpCodes opcode; |
| 535 | u_int flags; |
| 536 | } keywords[] = { |
| 537 | /* Portable-specific options */ |
| 538 | #ifdef USE_PAM |
| 539 | { "usepam", sUsePAM, SSHCFG_GLOBAL }, |
| 540 | #else |
| 541 | { "usepam", sUnsupported, SSHCFG_GLOBAL }, |
| 542 | #endif |
| 543 | { "pamauthenticationviakbdint", sDeprecated, SSHCFG_GLOBAL }, |
| 544 | /* Standard Options */ |
| 545 | { "port", sPort, SSHCFG_GLOBAL }, |
| 546 | { "hostkey", sHostKeyFile, SSHCFG_GLOBAL }, |
| 547 | { "hostdsakey", sHostKeyFile, SSHCFG_GLOBAL }, /* alias */ |
| 548 | { "hostkeyagent", sHostKeyAgent, SSHCFG_GLOBAL }, |
| 549 | { "pidfile", sPidFile, SSHCFG_GLOBAL }, |
| 550 | { "serverkeybits", sDeprecated, SSHCFG_GLOBAL }, |
| 551 | { "logingracetime", sLoginGraceTime, SSHCFG_GLOBAL }, |
| 552 | { "keyregenerationinterval", sDeprecated, SSHCFG_GLOBAL }, |
| 553 | { "permitrootlogin", sPermitRootLogin, SSHCFG_ALL }, |
| 554 | { "syslogfacility", sLogFacility, SSHCFG_GLOBAL }, |
| 555 | { "loglevel", sLogLevel, SSHCFG_ALL }, |
| 556 | { "rhostsauthentication", sDeprecated, SSHCFG_GLOBAL }, |
| 557 | { "rhostsrsaauthentication", sDeprecated, SSHCFG_ALL }, |
| 558 | { "hostbasedauthentication", sHostbasedAuthentication, SSHCFG_ALL }, |
| 559 | { "hostbasedusesnamefrompacketonly", sHostbasedUsesNameFromPacketOnly, SSHCFG_ALL }, |
| 560 | { "hostbasedacceptedkeytypes", sHostbasedAcceptedKeyTypes, SSHCFG_ALL }, |
| 561 | { "hostkeyalgorithms", sHostKeyAlgorithms, SSHCFG_GLOBAL }, |
| 562 | { "rsaauthentication", sDeprecated, SSHCFG_ALL }, |
| 563 | { "pubkeyauthentication", sPubkeyAuthentication, SSHCFG_ALL }, |
| 564 | { "pubkeyacceptedkeytypes", sPubkeyAcceptedKeyTypes, SSHCFG_ALL }, |
| 565 | { "dsaauthentication", sPubkeyAuthentication, SSHCFG_GLOBAL }, /* alias */ |
| 566 | #ifdef KRB5 |
| 567 | { "kerberosauthentication", sKerberosAuthentication, SSHCFG_ALL }, |
| 568 | { "kerberosorlocalpasswd", sKerberosOrLocalPasswd, SSHCFG_GLOBAL }, |
| 569 | { "kerberosticketcleanup", sKerberosTicketCleanup, SSHCFG_GLOBAL }, |
| 570 | #ifdef USE_AFS |
| 571 | { "kerberosgetafstoken", sKerberosGetAFSToken, SSHCFG_GLOBAL }, |
| 572 | #else |
| 573 | { "kerberosgetafstoken", sUnsupported, SSHCFG_GLOBAL }, |
| 574 | #endif |
| 575 | #else |
| 576 | { "kerberosauthentication", sUnsupported, SSHCFG_ALL }, |
| 577 | { "kerberosorlocalpasswd", sUnsupported, SSHCFG_GLOBAL }, |
| 578 | { "kerberosticketcleanup", sUnsupported, SSHCFG_GLOBAL }, |
| 579 | { "kerberosgetafstoken", sUnsupported, SSHCFG_GLOBAL }, |
| 580 | #endif |
| 581 | { "kerberostgtpassing", sUnsupported, SSHCFG_GLOBAL }, |
| 582 | { "afstokenpassing", sUnsupported, SSHCFG_GLOBAL }, |
| 583 | #ifdef GSSAPI |
| 584 | { "gssapiauthentication", sGssAuthentication, SSHCFG_ALL }, |
| 585 | { "gssapicleanupcredentials", sGssCleanupCreds, SSHCFG_GLOBAL }, |
| 586 | { "gssapistrictacceptorcheck", sGssStrictAcceptor, SSHCFG_GLOBAL }, |
| 587 | #else |
| 588 | { "gssapiauthentication", sUnsupported, SSHCFG_ALL }, |
| 589 | { "gssapicleanupcredentials", sUnsupported, SSHCFG_GLOBAL }, |
| 590 | { "gssapistrictacceptorcheck", sUnsupported, SSHCFG_GLOBAL }, |
| 591 | #endif |
| 592 | { "passwordauthentication", sPasswordAuthentication, SSHCFG_ALL }, |
| 593 | { "kbdinteractiveauthentication", sKbdInteractiveAuthentication, SSHCFG_ALL }, |
| 594 | { "challengeresponseauthentication", sChallengeResponseAuthentication, SSHCFG_GLOBAL }, |
| 595 | { "skeyauthentication", sDeprecated, SSHCFG_GLOBAL }, |
| 596 | { "checkmail", sDeprecated, SSHCFG_GLOBAL }, |
| 597 | { "listenaddress", sListenAddress, SSHCFG_GLOBAL }, |
| 598 | { "addressfamily", sAddressFamily, SSHCFG_GLOBAL }, |
| 599 | { "printmotd", sPrintMotd, SSHCFG_GLOBAL }, |
| 600 | #ifdef DISABLE_LASTLOG |
| 601 | { "printlastlog", sUnsupported, SSHCFG_GLOBAL }, |
| 602 | #else |
| 603 | { "printlastlog", sPrintLastLog, SSHCFG_GLOBAL }, |
| 604 | #endif |
| 605 | { "ignorerhosts", sIgnoreRhosts, SSHCFG_GLOBAL }, |
| 606 | { "ignoreuserknownhosts", sIgnoreUserKnownHosts, SSHCFG_GLOBAL }, |
| 607 | { "x11forwarding", sX11Forwarding, SSHCFG_ALL }, |
| 608 | { "x11displayoffset", sX11DisplayOffset, SSHCFG_ALL }, |
| 609 | { "x11uselocalhost", sX11UseLocalhost, SSHCFG_ALL }, |
| 610 | { "xauthlocation", sXAuthLocation, SSHCFG_GLOBAL }, |
| 611 | { "strictmodes", sStrictModes, SSHCFG_GLOBAL }, |
| 612 | { "permitemptypasswords", sEmptyPasswd, SSHCFG_ALL }, |
| 613 | { "permituserenvironment", sPermitUserEnvironment, SSHCFG_GLOBAL }, |
| 614 | { "uselogin", sDeprecated, SSHCFG_GLOBAL }, |
| 615 | { "compression", sCompression, SSHCFG_GLOBAL }, |
| 616 | { "rekeylimit", sRekeyLimit, SSHCFG_ALL }, |
| 617 | { "tcpkeepalive", sTCPKeepAlive, SSHCFG_GLOBAL }, |
| 618 | { "keepalive", sTCPKeepAlive, SSHCFG_GLOBAL }, /* obsolete alias */ |
| 619 | { "allowtcpforwarding", sAllowTcpForwarding, SSHCFG_ALL }, |
| 620 | { "allowagentforwarding", sAllowAgentForwarding, SSHCFG_ALL }, |
| 621 | { "allowusers", sAllowUsers, SSHCFG_ALL }, |
| 622 | { "denyusers", sDenyUsers, SSHCFG_ALL }, |
| 623 | { "allowgroups", sAllowGroups, SSHCFG_ALL }, |
| 624 | { "denygroups", sDenyGroups, SSHCFG_ALL }, |
| 625 | { "ciphers", sCiphers, SSHCFG_GLOBAL }, |
| 626 | { "macs", sMacs, SSHCFG_GLOBAL }, |
| 627 | { "protocol", sIgnore, SSHCFG_GLOBAL }, |
| 628 | { "gatewayports", sGatewayPorts, SSHCFG_ALL }, |
| 629 | { "subsystem", sSubsystem, SSHCFG_GLOBAL }, |
| 630 | { "maxstartups", sMaxStartups, SSHCFG_GLOBAL }, |
| 631 | { "maxauthtries", sMaxAuthTries, SSHCFG_ALL }, |
| 632 | { "maxsessions", sMaxSessions, SSHCFG_ALL }, |
| 633 | { "banner", sBanner, SSHCFG_ALL }, |
| 634 | { "usedns", sUseDNS, SSHCFG_GLOBAL }, |
| 635 | { "verifyreversemapping", sDeprecated, SSHCFG_GLOBAL }, |
| 636 | { "reversemappingcheck", sDeprecated, SSHCFG_GLOBAL }, |
| 637 | { "clientaliveinterval", sClientAliveInterval, SSHCFG_ALL }, |
| 638 | { "clientalivecountmax", sClientAliveCountMax, SSHCFG_ALL }, |
| 639 | { "authorizedkeysfile", sAuthorizedKeysFile, SSHCFG_ALL }, |
| 640 | { "authorizedkeysfile2", sDeprecated, SSHCFG_ALL }, |
| 641 | { "useprivilegeseparation", sDeprecated, SSHCFG_GLOBAL}, |
| 642 | { "acceptenv", sAcceptEnv, SSHCFG_ALL }, |
| 643 | { "setenv", sSetEnv, SSHCFG_ALL }, |
| 644 | { "permittunnel", sPermitTunnel, SSHCFG_ALL }, |
| 645 | { "permittty", sPermitTTY, SSHCFG_ALL }, |
| 646 | { "permituserrc", sPermitUserRC, SSHCFG_ALL }, |
| 647 | { "match", sMatch, SSHCFG_ALL }, |
| 648 | { "permitopen", sPermitOpen, SSHCFG_ALL }, |
| 649 | { "permitlisten", sPermitListen, SSHCFG_ALL }, |
| 650 | { "forcecommand", sForceCommand, SSHCFG_ALL }, |
| 651 | { "chrootdirectory", sChrootDirectory, SSHCFG_ALL }, |
| 652 | { "hostcertificate", sHostCertificate, SSHCFG_GLOBAL }, |
| 653 | { "revokedkeys", sRevokedKeys, SSHCFG_ALL }, |
| 654 | { "trustedusercakeys", sTrustedUserCAKeys, SSHCFG_ALL }, |
| 655 | { "authorizedprincipalsfile", sAuthorizedPrincipalsFile, SSHCFG_ALL }, |
| 656 | { "kexalgorithms", sKexAlgorithms, SSHCFG_GLOBAL }, |
| 657 | { "ipqos", sIPQoS, SSHCFG_ALL }, |
| 658 | { "authorizedkeyscommand", sAuthorizedKeysCommand, SSHCFG_ALL }, |
| 659 | { "authorizedkeyscommanduser", sAuthorizedKeysCommandUser, SSHCFG_ALL }, |
| 660 | { "authorizedprincipalscommand", sAuthorizedPrincipalsCommand, SSHCFG_ALL }, |
| 661 | { "authorizedprincipalscommanduser", sAuthorizedPrincipalsCommandUser, SSHCFG_ALL }, |
| 662 | { "versionaddendum", sVersionAddendum, SSHCFG_GLOBAL }, |
| 663 | { "authenticationmethods", sAuthenticationMethods, SSHCFG_ALL }, |
| 664 | { "streamlocalbindmask", sStreamLocalBindMask, SSHCFG_ALL }, |
| 665 | { "streamlocalbindunlink", sStreamLocalBindUnlink, SSHCFG_ALL }, |
| 666 | { "allowstreamlocalforwarding", sAllowStreamLocalForwarding, SSHCFG_ALL }, |
| 667 | { "fingerprinthash", sFingerprintHash, SSHCFG_GLOBAL }, |
| 668 | { "disableforwarding", sDisableForwarding, SSHCFG_ALL }, |
| 669 | { "exposeauthinfo", sExposeAuthInfo, SSHCFG_ALL }, |
| 670 | { "rdomain", sRDomain, SSHCFG_ALL }, |
| 671 | { "casignaturealgorithms", sCASignatureAlgorithms, SSHCFG_ALL }, |
| 672 | { NULL, sBadOption, 0 } |
| 673 | }; |
| 674 | |
| 675 | static struct { |
| 676 | int val; |
| 677 | char *text; |
| 678 | } tunmode_desc[] = { |
| 679 | { SSH_TUNMODE_NO, "no" }, |
| 680 | { SSH_TUNMODE_POINTOPOINT, "point-to-point" }, |
| 681 | { SSH_TUNMODE_ETHERNET, "ethernet" }, |
| 682 | { SSH_TUNMODE_YES, "yes" }, |
| 683 | { -1, NULL } |
| 684 | }; |
| 685 | |
| 686 | /* Returns an opcode name from its number */ |
| 687 | |
| 688 | static const char * |
| 689 | lookup_opcode_name(ServerOpCodes code) |
| 690 | { |
| 691 | u_int i; |
| 692 | |
| 693 | for (i = 0; keywords[i].name != NULL; i++) |
| 694 | if (keywords[i].opcode == code) |
| 695 | return(keywords[i].name); |
| 696 | return "UNKNOWN"; |
| 697 | } |
| 698 | |
| 699 | |
| 700 | /* |
| 701 | * Returns the number of the token pointed to by cp or sBadOption. |
| 702 | */ |
| 703 | |
| 704 | static ServerOpCodes |
| 705 | parse_token(const char *cp, const char *filename, |
| 706 | int linenum, u_int *flags) |
| 707 | { |
| 708 | u_int i; |
| 709 | |
| 710 | for (i = 0; keywords[i].name; i++) |
| 711 | if (strcasecmp(cp, keywords[i].name) == 0) { |
| 712 | *flags = keywords[i].flags; |
| 713 | return keywords[i].opcode; |
| 714 | } |
| 715 | |
| 716 | error("%s: line %d: Bad configuration option: %s", |
| 717 | filename, linenum, cp); |
| 718 | return sBadOption; |
| 719 | } |
| 720 | |
| 721 | char * |
| 722 | derelativise_path(const char *path) |
| 723 | { |
| 724 | char *expanded, *ret, cwd[PATH_MAX]; |
| 725 | |
| 726 | if (strcasecmp(path, "none") == 0) |
| 727 | return xstrdup("none"); |
| 728 | expanded = tilde_expand_filename(path, getuid()); |
| 729 | if (path_absolute(expanded)) |
| 730 | return expanded; |
| 731 | if (getcwd(cwd, sizeof(cwd)) == NULL) |
| 732 | fatal("%s: getcwd: %s", __func__, strerror(errno)); |
| 733 | xasprintf(&ret, "%s/%s", cwd, expanded); |
| 734 | free(expanded); |
| 735 | return ret; |
| 736 | } |
| 737 | |
| 738 | static void |
| 739 | add_listen_addr(ServerOptions *options, const char *addr, |
| 740 | const char *rdomain, int port) |
| 741 | { |
| 742 | u_int i; |
| 743 | |
| 744 | if (port > 0) |
| 745 | add_one_listen_addr(options, addr, rdomain, port); |
| 746 | else { |
| 747 | for (i = 0; i < options->num_ports; i++) { |
| 748 | add_one_listen_addr(options, addr, rdomain, |
| 749 | options->ports[i]); |
| 750 | } |
| 751 | } |
| 752 | } |
| 753 | |
| 754 | static void |
| 755 | add_one_listen_addr(ServerOptions *options, const char *addr, |
| 756 | const char *rdomain, int port) |
| 757 | { |
| 758 | struct addrinfo hints, *ai, *aitop; |
| 759 | char strport[NI_MAXSERV]; |
| 760 | int gaierr; |
| 761 | u_int i; |
| 762 | |
| 763 | /* Find listen_addrs entry for this rdomain */ |
| 764 | for (i = 0; i < options->num_listen_addrs; i++) { |
| 765 | if (rdomain == NULL && options->listen_addrs[i].rdomain == NULL) |
| 766 | break; |
| 767 | if (rdomain == NULL || options->listen_addrs[i].rdomain == NULL) |
| 768 | continue; |
| 769 | if (strcmp(rdomain, options->listen_addrs[i].rdomain) == 0) |
| 770 | break; |
| 771 | } |
| 772 | if (i >= options->num_listen_addrs) { |
| 773 | /* No entry for this rdomain; allocate one */ |
| 774 | if (i >= INT_MAX) |
| 775 | fatal("%s: too many listen addresses", __func__); |
| 776 | options->listen_addrs = xrecallocarray(options->listen_addrs, |
| 777 | options->num_listen_addrs, options->num_listen_addrs + 1, |
| 778 | sizeof(*options->listen_addrs)); |
| 779 | i = options->num_listen_addrs++; |
| 780 | if (rdomain != NULL) |
| 781 | options->listen_addrs[i].rdomain = xstrdup(rdomain); |
| 782 | } |
| 783 | /* options->listen_addrs[i] points to the addresses for this rdomain */ |
| 784 | |
| 785 | memset(&hints, 0, sizeof(hints)); |
| 786 | hints.ai_family = options->address_family; |
| 787 | hints.ai_socktype = SOCK_STREAM; |
| 788 | hints.ai_flags = (addr == NULL) ? AI_PASSIVE : 0; |
| 789 | snprintf(strport, sizeof strport, "%d", port); |
| 790 | if ((gaierr = getaddrinfo(addr, strport, &hints, &aitop)) != 0) |
| 791 | fatal("bad addr or host: %s (%s)", |
| 792 | addr ? addr : "<NULL>", |
| 793 | ssh_gai_strerror(gaierr)); |
| 794 | for (ai = aitop; ai->ai_next; ai = ai->ai_next) |
| 795 | ; |
| 796 | ai->ai_next = options->listen_addrs[i].addrs; |
| 797 | options->listen_addrs[i].addrs = aitop; |
| 798 | } |
| 799 | |
| 800 | /* Returns nonzero if the routing domain name is valid */ |
| 801 | static int |
| 802 | valid_rdomain(const char *name) |
| 803 | { |
| 804 | #if defined(HAVE_SYS_VALID_RDOMAIN) |
| 805 | return sys_valid_rdomain(name); |
| 806 | #elif defined(__OpenBSD__) |
| 807 | const char *errstr; |
| 808 | long long num; |
| 809 | struct rt_tableinfo info; |
| 810 | int mib[6]; |
| 811 | size_t miblen = sizeof(mib); |
| 812 | |
| 813 | if (name == NULL) |
| 814 | return 1; |
| 815 | |
| 816 | num = strtonum(name, 0, 255, &errstr); |
| 817 | if (errstr != NULL) |
| 818 | return 0; |
| 819 | |
| 820 | /* Check whether the table actually exists */ |
| 821 | memset(mib, 0, sizeof(mib)); |
| 822 | mib[0] = CTL_NET; |
| 823 | mib[1] = PF_ROUTE; |
| 824 | mib[4] = NET_RT_TABLE; |
| 825 | mib[5] = (int)num; |
| 826 | if (sysctl(mib, 6, &info, &miblen, NULL, 0) == -1) |
| 827 | return 0; |
| 828 | |
| 829 | return 1; |
| 830 | #else /* defined(__OpenBSD__) */ |
| 831 | error("Routing domains are not supported on this platform"); |
| 832 | return 0; |
| 833 | #endif |
| 834 | } |
| 835 | |
| 836 | /* |
| 837 | * Queue a ListenAddress to be processed once we have all of the Ports |
| 838 | * and AddressFamily options. |
| 839 | */ |
| 840 | static void |
| 841 | queue_listen_addr(ServerOptions *options, const char *addr, |
| 842 | const char *rdomain, int port) |
| 843 | { |
| 844 | struct queued_listenaddr *qla; |
| 845 | |
| 846 | options->queued_listen_addrs = xrecallocarray( |
| 847 | options->queued_listen_addrs, |
| 848 | options->num_queued_listens, options->num_queued_listens + 1, |
| 849 | sizeof(*options->queued_listen_addrs)); |
| 850 | qla = &options->queued_listen_addrs[options->num_queued_listens++]; |
| 851 | qla->addr = xstrdup(addr); |
| 852 | qla->port = port; |
| 853 | qla->rdomain = rdomain == NULL ? NULL : xstrdup(rdomain); |
| 854 | } |
| 855 | |
| 856 | /* |
| 857 | * Process queued (text) ListenAddress entries. |
| 858 | */ |
| 859 | static void |
| 860 | process_queued_listen_addrs(ServerOptions *options) |
| 861 | { |
| 862 | u_int i; |
| 863 | struct queued_listenaddr *qla; |
| 864 | |
| 865 | if (options->num_ports == 0) |
| 866 | options->ports[options->num_ports++] = SSH_DEFAULT_PORT; |
| 867 | if (options->address_family == -1) |
| 868 | options->address_family = AF_UNSPEC; |
| 869 | |
| 870 | for (i = 0; i < options->num_queued_listens; i++) { |
| 871 | qla = &options->queued_listen_addrs[i]; |
| 872 | add_listen_addr(options, qla->addr, qla->rdomain, qla->port); |
| 873 | free(qla->addr); |
| 874 | free(qla->rdomain); |
| 875 | } |
| 876 | free(options->queued_listen_addrs); |
| 877 | options->queued_listen_addrs = NULL; |
| 878 | options->num_queued_listens = 0; |
| 879 | } |
| 880 | |
| 881 | /* |
| 882 | * Inform channels layer of permitopen options for a single forwarding |
| 883 | * direction (local/remote). |
| 884 | */ |
| 885 | static void |
| 886 | process_permitopen_list(struct ssh *ssh, ServerOpCodes opcode, |
| 887 | char **opens, u_int num_opens) |
| 888 | { |
| 889 | u_int i; |
| 890 | int port; |
| 891 | char *host, *arg, *oarg, ch; |
| 892 | int where = opcode == sPermitOpen ? FORWARD_LOCAL : FORWARD_REMOTE; |
| 893 | const char *what = lookup_opcode_name(opcode); |
| 894 | |
| 895 | channel_clear_permission(ssh, FORWARD_ADM, where); |
| 896 | if (num_opens == 0) |
| 897 | return; /* permit any */ |
| 898 | |
| 899 | /* handle keywords: "any" / "none" */ |
| 900 | if (num_opens == 1 && strcmp(opens[0], "any") == 0) |
| 901 | return; |
| 902 | if (num_opens == 1 && strcmp(opens[0], "none") == 0) { |
| 903 | channel_disable_admin(ssh, where); |
| 904 | return; |
| 905 | } |
| 906 | /* Otherwise treat it as a list of permitted host:port */ |
| 907 | for (i = 0; i < num_opens; i++) { |
| 908 | oarg = arg = xstrdup(opens[i]); |
| 909 | ch = '\0'; |
| 910 | host = hpdelim2(&arg, &ch); |
| 911 | if (host == NULL || ch == '/') |
| 912 | fatal("%s: missing host in %s", __func__, what); |
| 913 | host = cleanhostname(host); |
| 914 | if (arg == NULL || ((port = permitopen_port(arg)) < 0)) |
| 915 | fatal("%s: bad port number in %s", __func__, what); |
| 916 | /* Send it to channels layer */ |
| 917 | channel_add_permission(ssh, FORWARD_ADM, |
| 918 | where, host, port); |
| 919 | free(oarg); |
| 920 | } |
| 921 | } |
| 922 | |
| 923 | /* |
| 924 | * Inform channels layer of permitopen options from configuration. |
| 925 | */ |
| 926 | void |
| 927 | process_permitopen(struct ssh *ssh, ServerOptions *options) |
| 928 | { |
| 929 | process_permitopen_list(ssh, sPermitOpen, |
| 930 | options->permitted_opens, options->num_permitted_opens); |
| 931 | process_permitopen_list(ssh, sPermitListen, |
| 932 | options->permitted_listens, |
| 933 | options->num_permitted_listens); |
| 934 | } |
| 935 | |
| 936 | struct connection_info * |
| 937 | get_connection_info(struct ssh *ssh, int populate, int use_dns) |
| 938 | { |
| 939 | static struct connection_info ci; |
| 940 | |
| 941 | if (ssh == NULL || !populate) |
| 942 | return &ci; |
| 943 | ci.host = auth_get_canonical_hostname(ssh, use_dns); |
| 944 | ci.address = ssh_remote_ipaddr(ssh); |
| 945 | ci.laddress = ssh_local_ipaddr(ssh); |
| 946 | ci.lport = ssh_local_port(ssh); |
| 947 | ci.rdomain = ssh_packet_rdomain_in(ssh); |
| 948 | return &ci; |
| 949 | } |
| 950 | |
| 951 | /* |
| 952 | * The strategy for the Match blocks is that the config file is parsed twice. |
| 953 | * |
| 954 | * The first time is at startup. activep is initialized to 1 and the |
| 955 | * directives in the global context are processed and acted on. Hitting a |
| 956 | * Match directive unsets activep and the directives inside the block are |
| 957 | * checked for syntax only. |
| 958 | * |
| 959 | * The second time is after a connection has been established but before |
| 960 | * authentication. activep is initialized to 2 and global config directives |
| 961 | * are ignored since they have already been processed. If the criteria in a |
| 962 | * Match block is met, activep is set and the subsequent directives |
| 963 | * processed and actioned until EOF or another Match block unsets it. Any |
| 964 | * options set are copied into the main server config. |
| 965 | * |
| 966 | * Potential additions/improvements: |
| 967 | * - Add Match support for pre-kex directives, eg. Ciphers. |
| 968 | * |
| 969 | * - Add a Tag directive (idea from David Leonard) ala pf, eg: |
| 970 | * Match Address 192.168.0.* |
| 971 | * Tag trusted |
| 972 | * Match Group wheel |
| 973 | * Tag trusted |
| 974 | * Match Tag trusted |
| 975 | * AllowTcpForwarding yes |
| 976 | * GatewayPorts clientspecified |
| 977 | * [...] |
| 978 | * |
| 979 | * - Add a PermittedChannelRequests directive |
| 980 | * Match Group shell |
| 981 | * PermittedChannelRequests session,forwarded-tcpip |
| 982 | */ |
| 983 | |
| 984 | static int |
| 985 | match_cfg_line_group(const char *grps, int line, const char *user) |
| 986 | { |
| 987 | int result = 0; |
| 988 | struct passwd *pw; |
| 989 | |
| 990 | if (user == NULL) |
| 991 | goto out; |
| 992 | |
| 993 | if ((pw = getpwnam(user)) == NULL) { |
| 994 | debug("Can't match group at line %d because user %.100s does " |
| 995 | "not exist", line, user); |
| 996 | } else if (ga_init(pw->pw_name, pw->pw_gid) == 0) { |
| 997 | debug("Can't Match group because user %.100s not in any group " |
| 998 | "at line %d", user, line); |
| 999 | } else if (ga_match_pattern_list(grps) != 1) { |
| 1000 | debug("user %.100s does not match group list %.100s at line %d", |
| 1001 | user, grps, line); |
| 1002 | } else { |
| 1003 | debug("user %.100s matched group list %.100s at line %d", user, |
| 1004 | grps, line); |
| 1005 | result = 1; |
| 1006 | } |
| 1007 | out: |
| 1008 | ga_free(); |
| 1009 | return result; |
| 1010 | } |
| 1011 | |
| 1012 | static void |
| 1013 | match_test_missing_fatal(const char *criteria, const char *attrib) |
| 1014 | { |
| 1015 | fatal("'Match %s' in configuration but '%s' not in connection " |
| 1016 | "test specification.", criteria, attrib); |
| 1017 | } |
| 1018 | |
| 1019 | /* |
| 1020 | * All of the attributes on a single Match line are ANDed together, so we need |
| 1021 | * to check every attribute and set the result to zero if any attribute does |
| 1022 | * not match. |
| 1023 | */ |
| 1024 | static int |
| 1025 | match_cfg_line(char **condition, int line, struct connection_info *ci) |
| 1026 | { |
| 1027 | int result = 1, attributes = 0, port; |
| 1028 | char *arg, *attrib, *cp = *condition; |
| 1029 | |
| 1030 | if (ci == NULL) |
| 1031 | debug3("checking syntax for 'Match %s'", cp); |
| 1032 | else |
| 1033 | debug3("checking match for '%s' user %s host %s addr %s " |
| 1034 | "laddr %s lport %d", cp, ci->user ? ci->user : "(null)", |
| 1035 | ci->host ? ci->host : "(null)", |
| 1036 | ci->address ? ci->address : "(null)", |
| 1037 | ci->laddress ? ci->laddress : "(null)", ci->lport); |
| 1038 | |
| 1039 | while ((attrib = strdelim(&cp)) && *attrib != '\0') { |
| 1040 | attributes++; |
| 1041 | if (strcasecmp(attrib, "all") == 0) { |
| 1042 | if (attributes != 1 || |
| 1043 | ((arg = strdelim(&cp)) != NULL && *arg != '\0')) { |
| 1044 | error("'all' cannot be combined with other " |
| 1045 | "Match attributes"); |
| 1046 | return -1; |
| 1047 | } |
| 1048 | *condition = cp; |
| 1049 | return 1; |
| 1050 | } |
| 1051 | if ((arg = strdelim(&cp)) == NULL || *arg == '\0') { |
| 1052 | error("Missing Match criteria for %s", attrib); |
| 1053 | return -1; |
| 1054 | } |
| 1055 | if (strcasecmp(attrib, "user") == 0) { |
| 1056 | if (ci == NULL) { |
| 1057 | result = 0; |
| 1058 | continue; |
| 1059 | } |
| 1060 | if (ci->user == NULL) |
| 1061 | match_test_missing_fatal("User", "user"); |
| 1062 | if (match_usergroup_pattern_list(ci->user, arg) != 1) |
| 1063 | result = 0; |
| 1064 | else |
| 1065 | debug("user %.100s matched 'User %.100s' at " |
| 1066 | "line %d", ci->user, arg, line); |
| 1067 | } else if (strcasecmp(attrib, "group") == 0) { |
| 1068 | if (ci == NULL) { |
| 1069 | result = 0; |
| 1070 | continue; |
| 1071 | } |
| 1072 | if (ci->user == NULL) |
| 1073 | match_test_missing_fatal("Group", "user"); |
| 1074 | switch (match_cfg_line_group(arg, line, ci->user)) { |
| 1075 | case -1: |
| 1076 | return -1; |
| 1077 | case 0: |
| 1078 | result = 0; |
| 1079 | } |
| 1080 | } else if (strcasecmp(attrib, "host") == 0) { |
| 1081 | if (ci == NULL) { |
| 1082 | result = 0; |
| 1083 | continue; |
| 1084 | } |
| 1085 | if (ci->host == NULL) |
| 1086 | match_test_missing_fatal("Host", "host"); |
| 1087 | if (match_hostname(ci->host, arg) != 1) |
| 1088 | result = 0; |
| 1089 | else |
| 1090 | debug("connection from %.100s matched 'Host " |
| 1091 | "%.100s' at line %d", ci->host, arg, line); |
| 1092 | } else if (strcasecmp(attrib, "address") == 0) { |
| 1093 | if (ci == NULL) { |
| 1094 | result = 0; |
| 1095 | continue; |
| 1096 | } |
| 1097 | if (ci->address == NULL) |
| 1098 | match_test_missing_fatal("Address", "addr"); |
| 1099 | switch (addr_match_list(ci->address, arg)) { |
| 1100 | case 1: |
| 1101 | debug("connection from %.100s matched 'Address " |
| 1102 | "%.100s' at line %d", ci->address, arg, line); |
| 1103 | break; |
| 1104 | case 0: |
| 1105 | case -1: |
| 1106 | result = 0; |
| 1107 | break; |
| 1108 | case -2: |
| 1109 | return -1; |
| 1110 | } |
| 1111 | } else if (strcasecmp(attrib, "localaddress") == 0){ |
| 1112 | if (ci == NULL) { |
| 1113 | result = 0; |
| 1114 | continue; |
| 1115 | } |
| 1116 | if (ci->laddress == NULL) |
| 1117 | match_test_missing_fatal("LocalAddress", |
| 1118 | "laddr"); |
| 1119 | switch (addr_match_list(ci->laddress, arg)) { |
| 1120 | case 1: |
| 1121 | debug("connection from %.100s matched " |
| 1122 | "'LocalAddress %.100s' at line %d", |
| 1123 | ci->laddress, arg, line); |
| 1124 | break; |
| 1125 | case 0: |
| 1126 | case -1: |
| 1127 | result = 0; |
| 1128 | break; |
| 1129 | case -2: |
| 1130 | return -1; |
| 1131 | } |
| 1132 | } else if (strcasecmp(attrib, "localport") == 0) { |
| 1133 | if ((port = a2port(arg)) == -1) { |
| 1134 | error("Invalid LocalPort '%s' on Match line", |
| 1135 | arg); |
| 1136 | return -1; |
| 1137 | } |
| 1138 | if (ci == NULL) { |
| 1139 | result = 0; |
| 1140 | continue; |
| 1141 | } |
| 1142 | if (ci->lport == 0) |
| 1143 | match_test_missing_fatal("LocalPort", "lport"); |
| 1144 | /* TODO support port lists */ |
| 1145 | if (port == ci->lport) |
| 1146 | debug("connection from %.100s matched " |
| 1147 | "'LocalPort %d' at line %d", |
| 1148 | ci->laddress, port, line); |
| 1149 | else |
| 1150 | result = 0; |
| 1151 | } else if (strcasecmp(attrib, "rdomain") == 0) { |
| 1152 | if (ci == NULL || ci->rdomain == NULL) { |
| 1153 | result = 0; |
| 1154 | continue; |
| 1155 | } |
| 1156 | if (match_pattern_list(ci->rdomain, arg, 0) != 1) |
| 1157 | result = 0; |
| 1158 | else |
| 1159 | debug("user %.100s matched 'RDomain %.100s' at " |
| 1160 | "line %d", ci->rdomain, arg, line); |
| 1161 | } else { |
| 1162 | error("Unsupported Match attribute %s", attrib); |
| 1163 | return -1; |
| 1164 | } |
| 1165 | } |
| 1166 | if (attributes == 0) { |
| 1167 | error("One or more attributes required for Match"); |
| 1168 | return -1; |
| 1169 | } |
| 1170 | if (ci != NULL) |
| 1171 | debug3("match %sfound", result ? "" : "not "); |
| 1172 | *condition = cp; |
| 1173 | return result; |
| 1174 | } |
| 1175 | |
| 1176 | #define WHITESPACE " \t\r\n" |
| 1177 | |
| 1178 | /* Multistate option parsing */ |
| 1179 | struct multistate { |
| 1180 | char *key; |
| 1181 | int value; |
| 1182 | }; |
| 1183 | static const struct multistate multistate_flag[] = { |
| 1184 | { "yes", 1 }, |
| 1185 | { "no", 0 }, |
| 1186 | { NULL, -1 } |
| 1187 | }; |
| 1188 | static const struct multistate multistate_addressfamily[] = { |
| 1189 | { "inet", AF_INET }, |
| 1190 | { "inet6", AF_INET6 }, |
| 1191 | { "any", AF_UNSPEC }, |
| 1192 | { NULL, -1 } |
| 1193 | }; |
| 1194 | static const struct multistate multistate_permitrootlogin[] = { |
| 1195 | { "without-password", PERMIT_NO_PASSWD }, |
| 1196 | { "prohibit-password", PERMIT_NO_PASSWD }, |
| 1197 | { "forced-commands-only", PERMIT_FORCED_ONLY }, |
| 1198 | { "yes", PERMIT_YES }, |
| 1199 | { "no", PERMIT_NO }, |
| 1200 | { NULL, -1 } |
| 1201 | }; |
| 1202 | static const struct multistate multistate_compression[] = { |
| 1203 | { "yes", COMP_DELAYED }, |
| 1204 | { "delayed", COMP_DELAYED }, |
| 1205 | { "no", COMP_NONE }, |
| 1206 | { NULL, -1 } |
| 1207 | }; |
| 1208 | static const struct multistate multistate_gatewayports[] = { |
| 1209 | { "clientspecified", 2 }, |
| 1210 | { "yes", 1 }, |
| 1211 | { "no", 0 }, |
| 1212 | { NULL, -1 } |
| 1213 | }; |
| 1214 | static const struct multistate multistate_tcpfwd[] = { |
| 1215 | { "yes", FORWARD_ALLOW }, |
| 1216 | { "all", FORWARD_ALLOW }, |
| 1217 | { "no", FORWARD_DENY }, |
| 1218 | { "remote", FORWARD_REMOTE }, |
| 1219 | { "local", FORWARD_LOCAL }, |
| 1220 | { NULL, -1 } |
| 1221 | }; |
| 1222 | |
| 1223 | int |
| 1224 | process_server_config_line(ServerOptions *options, char *line, |
| 1225 | const char *filename, int linenum, int *activep, |
| 1226 | struct connection_info *connectinfo) |
| 1227 | { |
| 1228 | char ch, *cp, ***chararrayptr, **charptr, *arg, *arg2, *p; |
| 1229 | int cmdline = 0, *intptr, value, value2, n, port; |
| 1230 | SyslogFacility *log_facility_ptr; |
| 1231 | LogLevel *log_level_ptr; |
| 1232 | ServerOpCodes opcode; |
| 1233 | u_int i, *uintptr, uvalue, flags = 0; |
| 1234 | size_t len; |
| 1235 | long long val64; |
| 1236 | const struct multistate *multistate_ptr; |
| 1237 | const char *errstr; |
| 1238 | |
| 1239 | /* Strip trailing whitespace. Allow \f (form feed) at EOL only */ |
| 1240 | if ((len = strlen(line)) == 0) |
| 1241 | return 0; |
| 1242 | for (len--; len > 0; len--) { |
| 1243 | if (strchr(WHITESPACE "\f", line[len]) == NULL) |
| 1244 | break; |
| 1245 | line[len] = '\0'; |
| 1246 | } |
| 1247 | |
| 1248 | cp = line; |
| 1249 | if ((arg = strdelim(&cp)) == NULL) |
| 1250 | return 0; |
| 1251 | /* Ignore leading whitespace */ |
| 1252 | if (*arg == '\0') |
| 1253 | arg = strdelim(&cp); |
| 1254 | if (!arg || !*arg || *arg == '#') |
| 1255 | return 0; |
| 1256 | intptr = NULL; |
| 1257 | charptr = NULL; |
| 1258 | opcode = parse_token(arg, filename, linenum, &flags); |
| 1259 | |
| 1260 | if (activep == NULL) { /* We are processing a command line directive */ |
| 1261 | cmdline = 1; |
| 1262 | activep = &cmdline; |
| 1263 | } |
| 1264 | if (*activep && opcode != sMatch) |
| 1265 | debug3("%s:%d setting %s %s", filename, linenum, arg, cp); |
| 1266 | if (*activep == 0 && !(flags & SSHCFG_MATCH)) { |
| 1267 | if (connectinfo == NULL) { |
| 1268 | fatal("%s line %d: Directive '%s' is not allowed " |
| 1269 | "within a Match block", filename, linenum, arg); |
| 1270 | } else { /* this is a directive we have already processed */ |
| 1271 | while (arg) |
| 1272 | arg = strdelim(&cp); |
| 1273 | return 0; |
| 1274 | } |
| 1275 | } |
| 1276 | |
| 1277 | switch (opcode) { |
| 1278 | /* Portable-specific options */ |
| 1279 | case sUsePAM: |
| 1280 | intptr = &options->use_pam; |
| 1281 | goto parse_flag; |
| 1282 | |
| 1283 | /* Standard Options */ |
| 1284 | case sBadOption: |
| 1285 | return -1; |
| 1286 | case sPort: |
| 1287 | /* ignore ports from configfile if cmdline specifies ports */ |
| 1288 | if (options->ports_from_cmdline) |
| 1289 | return 0; |
| 1290 | if (options->num_ports >= MAX_PORTS) |
| 1291 | fatal("%s line %d: too many ports.", |
| 1292 | filename, linenum); |
| 1293 | arg = strdelim(&cp); |
| 1294 | if (!arg || *arg == '\0') |
| 1295 | fatal("%s line %d: missing port number.", |
| 1296 | filename, linenum); |
| 1297 | options->ports[options->num_ports++] = a2port(arg); |
| 1298 | if (options->ports[options->num_ports-1] <= 0) |
| 1299 | fatal("%s line %d: Badly formatted port number.", |
| 1300 | filename, linenum); |
| 1301 | break; |
| 1302 | |
| 1303 | case sLoginGraceTime: |
| 1304 | intptr = &options->login_grace_time; |
| 1305 | parse_time: |
| 1306 | arg = strdelim(&cp); |
| 1307 | if (!arg || *arg == '\0') |
| 1308 | fatal("%s line %d: missing time value.", |
| 1309 | filename, linenum); |
| 1310 | if ((value = convtime(arg)) == -1) |
| 1311 | fatal("%s line %d: invalid time value.", |
| 1312 | filename, linenum); |
| 1313 | if (*activep && *intptr == -1) |
| 1314 | *intptr = value; |
| 1315 | break; |
| 1316 | |
| 1317 | case sListenAddress: |
| 1318 | arg = strdelim(&cp); |
| 1319 | if (arg == NULL || *arg == '\0') |
| 1320 | fatal("%s line %d: missing address", |
| 1321 | filename, linenum); |
| 1322 | /* check for bare IPv6 address: no "[]" and 2 or more ":" */ |
| 1323 | if (strchr(arg, '[') == NULL && (p = strchr(arg, ':')) != NULL |
| 1324 | && strchr(p+1, ':') != NULL) { |
| 1325 | port = 0; |
| 1326 | p = arg; |
| 1327 | } else { |
| 1328 | arg2 = NULL; |
| 1329 | ch = '\0'; |
| 1330 | p = hpdelim2(&arg, &ch); |
| 1331 | if (p == NULL || ch == '/') |
| 1332 | fatal("%s line %d: bad address:port usage", |
| 1333 | filename, linenum); |
| 1334 | p = cleanhostname(p); |
| 1335 | if (arg == NULL) |
| 1336 | port = 0; |
| 1337 | else if ((port = a2port(arg)) <= 0) |
| 1338 | fatal("%s line %d: bad port number", |
| 1339 | filename, linenum); |
| 1340 | } |
| 1341 | /* Optional routing table */ |
| 1342 | arg2 = NULL; |
| 1343 | if ((arg = strdelim(&cp)) != NULL) { |
| 1344 | if (strcmp(arg, "rdomain") != 0 || |
| 1345 | (arg2 = strdelim(&cp)) == NULL) |
| 1346 | fatal("%s line %d: bad ListenAddress syntax", |
| 1347 | filename, linenum); |
| 1348 | if (!valid_rdomain(arg2)) |
| 1349 | fatal("%s line %d: bad routing domain", |
| 1350 | filename, linenum); |
| 1351 | } |
| 1352 | |
| 1353 | queue_listen_addr(options, p, arg2, port); |
| 1354 | |
| 1355 | break; |
| 1356 | |
| 1357 | case sAddressFamily: |
| 1358 | intptr = &options->address_family; |
| 1359 | multistate_ptr = multistate_addressfamily; |
| 1360 | parse_multistate: |
| 1361 | arg = strdelim(&cp); |
| 1362 | if (!arg || *arg == '\0') |
| 1363 | fatal("%s line %d: missing argument.", |
| 1364 | filename, linenum); |
| 1365 | value = -1; |
| 1366 | for (i = 0; multistate_ptr[i].key != NULL; i++) { |
| 1367 | if (strcasecmp(arg, multistate_ptr[i].key) == 0) { |
| 1368 | value = multistate_ptr[i].value; |
| 1369 | break; |
| 1370 | } |
| 1371 | } |
| 1372 | if (value == -1) |
| 1373 | fatal("%s line %d: unsupported option \"%s\".", |
| 1374 | filename, linenum, arg); |
| 1375 | if (*activep && *intptr == -1) |
| 1376 | *intptr = value; |
| 1377 | break; |
| 1378 | |
| 1379 | case sHostKeyFile: |
| 1380 | arg = strdelim(&cp); |
| 1381 | if (!arg || *arg == '\0') |
| 1382 | fatal("%s line %d: missing file name.", |
| 1383 | filename, linenum); |
| 1384 | if (*activep) { |
| 1385 | servconf_add_hostkey(filename, linenum, |
| 1386 | options, arg, 1); |
| 1387 | } |
| 1388 | break; |
| 1389 | |
| 1390 | case sHostKeyAgent: |
| 1391 | charptr = &options->host_key_agent; |
| 1392 | arg = strdelim(&cp); |
| 1393 | if (!arg || *arg == '\0') |
| 1394 | fatal("%s line %d: missing socket name.", |
| 1395 | filename, linenum); |
| 1396 | if (*activep && *charptr == NULL) |
| 1397 | *charptr = !strcmp(arg, SSH_AUTHSOCKET_ENV_NAME) ? |
| 1398 | xstrdup(arg) : derelativise_path(arg); |
| 1399 | break; |
| 1400 | |
| 1401 | case sHostCertificate: |
| 1402 | arg = strdelim(&cp); |
| 1403 | if (!arg || *arg == '\0') |
| 1404 | fatal("%s line %d: missing file name.", |
| 1405 | filename, linenum); |
| 1406 | if (*activep) |
| 1407 | servconf_add_hostcert(filename, linenum, options, arg); |
| 1408 | break; |
| 1409 | |
| 1410 | case sPidFile: |
| 1411 | charptr = &options->pid_file; |
| 1412 | parse_filename: |
| 1413 | arg = strdelim(&cp); |
| 1414 | if (!arg || *arg == '\0') |
| 1415 | fatal("%s line %d: missing file name.", |
| 1416 | filename, linenum); |
| 1417 | if (*activep && *charptr == NULL) { |
| 1418 | *charptr = derelativise_path(arg); |
| 1419 | /* increase optional counter */ |
| 1420 | if (intptr != NULL) |
| 1421 | *intptr = *intptr + 1; |
| 1422 | } |
| 1423 | break; |
| 1424 | |
| 1425 | case sPermitRootLogin: |
| 1426 | intptr = &options->permit_root_login; |
| 1427 | multistate_ptr = multistate_permitrootlogin; |
| 1428 | goto parse_multistate; |
| 1429 | |
| 1430 | case sIgnoreRhosts: |
| 1431 | intptr = &options->ignore_rhosts; |
| 1432 | parse_flag: |
| 1433 | multistate_ptr = multistate_flag; |
| 1434 | goto parse_multistate; |
| 1435 | |
| 1436 | case sIgnoreUserKnownHosts: |
| 1437 | intptr = &options->ignore_user_known_hosts; |
| 1438 | goto parse_flag; |
| 1439 | |
| 1440 | case sHostbasedAuthentication: |
| 1441 | intptr = &options->hostbased_authentication; |
| 1442 | goto parse_flag; |
| 1443 | |
| 1444 | case sHostbasedUsesNameFromPacketOnly: |
| 1445 | intptr = &options->hostbased_uses_name_from_packet_only; |
| 1446 | goto parse_flag; |
| 1447 | |
| 1448 | case sHostbasedAcceptedKeyTypes: |
| 1449 | charptr = &options->hostbased_key_types; |
| 1450 | parse_keytypes: |
| 1451 | arg = strdelim(&cp); |
| 1452 | if (!arg || *arg == '\0') |
| 1453 | fatal("%s line %d: Missing argument.", |
| 1454 | filename, linenum); |
| 1455 | if (*arg != '-' && |
| 1456 | !sshkey_names_valid2(*arg == '+' ? arg + 1 : arg, 1)) |
| 1457 | fatal("%s line %d: Bad key types '%s'.", |
| 1458 | filename, linenum, arg ? arg : "<NONE>"); |
| 1459 | if (*activep && *charptr == NULL) |
| 1460 | *charptr = xstrdup(arg); |
| 1461 | break; |
| 1462 | |
| 1463 | case sHostKeyAlgorithms: |
| 1464 | charptr = &options->hostkeyalgorithms; |
| 1465 | goto parse_keytypes; |
| 1466 | |
| 1467 | case sCASignatureAlgorithms: |
| 1468 | charptr = &options->ca_sign_algorithms; |
| 1469 | goto parse_keytypes; |
| 1470 | |
| 1471 | case sPubkeyAuthentication: |
| 1472 | intptr = &options->pubkey_authentication; |
| 1473 | goto parse_flag; |
| 1474 | |
| 1475 | case sPubkeyAcceptedKeyTypes: |
| 1476 | charptr = &options->pubkey_key_types; |
| 1477 | goto parse_keytypes; |
| 1478 | |
| 1479 | case sKerberosAuthentication: |
| 1480 | intptr = &options->kerberos_authentication; |
| 1481 | goto parse_flag; |
| 1482 | |
| 1483 | case sKerberosOrLocalPasswd: |
| 1484 | intptr = &options->kerberos_or_local_passwd; |
| 1485 | goto parse_flag; |
| 1486 | |
| 1487 | case sKerberosTicketCleanup: |
| 1488 | intptr = &options->kerberos_ticket_cleanup; |
| 1489 | goto parse_flag; |
| 1490 | |
| 1491 | case sKerberosGetAFSToken: |
| 1492 | intptr = &options->kerberos_get_afs_token; |
| 1493 | goto parse_flag; |
| 1494 | |
| 1495 | case sGssAuthentication: |
| 1496 | intptr = &options->gss_authentication; |
| 1497 | goto parse_flag; |
| 1498 | |
| 1499 | case sGssCleanupCreds: |
| 1500 | intptr = &options->gss_cleanup_creds; |
| 1501 | goto parse_flag; |
| 1502 | |
| 1503 | case sGssStrictAcceptor: |
| 1504 | intptr = &options->gss_strict_acceptor; |
| 1505 | goto parse_flag; |
| 1506 | |
| 1507 | case sPasswordAuthentication: |
| 1508 | intptr = &options->password_authentication; |
| 1509 | goto parse_flag; |
| 1510 | |
| 1511 | case sKbdInteractiveAuthentication: |
| 1512 | intptr = &options->kbd_interactive_authentication; |
| 1513 | goto parse_flag; |
| 1514 | |
| 1515 | case sChallengeResponseAuthentication: |
| 1516 | intptr = &options->challenge_response_authentication; |
| 1517 | goto parse_flag; |
| 1518 | |
| 1519 | case sPrintMotd: |
| 1520 | intptr = &options->print_motd; |
| 1521 | goto parse_flag; |
| 1522 | |
| 1523 | case sPrintLastLog: |
| 1524 | intptr = &options->print_lastlog; |
| 1525 | goto parse_flag; |
| 1526 | |
| 1527 | case sX11Forwarding: |
| 1528 | intptr = &options->x11_forwarding; |
| 1529 | goto parse_flag; |
| 1530 | |
| 1531 | case sX11DisplayOffset: |
| 1532 | intptr = &options->x11_display_offset; |
| 1533 | parse_int: |
| 1534 | arg = strdelim(&cp); |
| 1535 | if ((errstr = atoi_err(arg, &value)) != NULL) |
| 1536 | fatal("%s line %d: integer value %s.", |
| 1537 | filename, linenum, errstr); |
| 1538 | if (*activep && *intptr == -1) |
| 1539 | *intptr = value; |
| 1540 | break; |
| 1541 | |
| 1542 | case sX11UseLocalhost: |
| 1543 | intptr = &options->x11_use_localhost; |
| 1544 | goto parse_flag; |
| 1545 | |
| 1546 | case sXAuthLocation: |
| 1547 | charptr = &options->xauth_location; |
| 1548 | goto parse_filename; |
| 1549 | |
| 1550 | case sPermitTTY: |
| 1551 | intptr = &options->permit_tty; |
| 1552 | goto parse_flag; |
| 1553 | |
| 1554 | case sPermitUserRC: |
| 1555 | intptr = &options->permit_user_rc; |
| 1556 | goto parse_flag; |
| 1557 | |
| 1558 | case sStrictModes: |
| 1559 | intptr = &options->strict_modes; |
| 1560 | goto parse_flag; |
| 1561 | |
| 1562 | case sTCPKeepAlive: |
| 1563 | intptr = &options->tcp_keep_alive; |
| 1564 | goto parse_flag; |
| 1565 | |
| 1566 | case sEmptyPasswd: |
| 1567 | intptr = &options->permit_empty_passwd; |
| 1568 | goto parse_flag; |
| 1569 | |
| 1570 | case sPermitUserEnvironment: |
| 1571 | intptr = &options->permit_user_env; |
| 1572 | charptr = &options->permit_user_env_whitelist; |
| 1573 | arg = strdelim(&cp); |
| 1574 | if (!arg || *arg == '\0') |
| 1575 | fatal("%s line %d: missing argument.", |
| 1576 | filename, linenum); |
| 1577 | value = 0; |
| 1578 | p = NULL; |
| 1579 | if (strcmp(arg, "yes") == 0) |
| 1580 | value = 1; |
| 1581 | else if (strcmp(arg, "no") == 0) |
| 1582 | value = 0; |
| 1583 | else { |
| 1584 | /* Pattern-list specified */ |
| 1585 | value = 1; |
| 1586 | p = xstrdup(arg); |
| 1587 | } |
| 1588 | if (*activep && *intptr == -1) { |
| 1589 | *intptr = value; |
| 1590 | *charptr = p; |
| 1591 | p = NULL; |
| 1592 | } |
| 1593 | free(p); |
| 1594 | break; |
| 1595 | |
| 1596 | case sCompression: |
| 1597 | intptr = &options->compression; |
| 1598 | multistate_ptr = multistate_compression; |
| 1599 | goto parse_multistate; |
| 1600 | |
| 1601 | case sRekeyLimit: |
| 1602 | arg = strdelim(&cp); |
| 1603 | if (!arg || *arg == '\0') |
| 1604 | fatal("%.200s line %d: Missing argument.", filename, |
| 1605 | linenum); |
| 1606 | if (strcmp(arg, "default") == 0) { |
| 1607 | val64 = 0; |
| 1608 | } else { |
| 1609 | if (scan_scaled(arg, &val64) == -1) |
| 1610 | fatal("%.200s line %d: Bad number '%s': %s", |
| 1611 | filename, linenum, arg, strerror(errno)); |
| 1612 | if (val64 != 0 && val64 < 16) |
| 1613 | fatal("%.200s line %d: RekeyLimit too small", |
| 1614 | filename, linenum); |
| 1615 | } |
| 1616 | if (*activep && options->rekey_limit == -1) |
| 1617 | options->rekey_limit = val64; |
| 1618 | if (cp != NULL) { /* optional rekey interval present */ |
| 1619 | if (strcmp(cp, "none") == 0) { |
| 1620 | (void)strdelim(&cp); /* discard */ |
| 1621 | break; |
| 1622 | } |
| 1623 | intptr = &options->rekey_interval; |
| 1624 | goto parse_time; |
| 1625 | } |
| 1626 | break; |
| 1627 | |
| 1628 | case sGatewayPorts: |
| 1629 | intptr = &options->fwd_opts.gateway_ports; |
| 1630 | multistate_ptr = multistate_gatewayports; |
| 1631 | goto parse_multistate; |
| 1632 | |
| 1633 | case sUseDNS: |
| 1634 | intptr = &options->use_dns; |
| 1635 | goto parse_flag; |
| 1636 | |
| 1637 | case sLogFacility: |
| 1638 | log_facility_ptr = &options->log_facility; |
| 1639 | arg = strdelim(&cp); |
| 1640 | value = log_facility_number(arg); |
| 1641 | if (value == SYSLOG_FACILITY_NOT_SET) |
| 1642 | fatal("%.200s line %d: unsupported log facility '%s'", |
| 1643 | filename, linenum, arg ? arg : "<NONE>"); |
| 1644 | if (*log_facility_ptr == -1) |
| 1645 | *log_facility_ptr = (SyslogFacility) value; |
| 1646 | break; |
| 1647 | |
| 1648 | case sLogLevel: |
| 1649 | log_level_ptr = &options->log_level; |
| 1650 | arg = strdelim(&cp); |
| 1651 | value = log_level_number(arg); |
| 1652 | if (value == SYSLOG_LEVEL_NOT_SET) |
| 1653 | fatal("%.200s line %d: unsupported log level '%s'", |
| 1654 | filename, linenum, arg ? arg : "<NONE>"); |
| 1655 | if (*activep && *log_level_ptr == -1) |
| 1656 | *log_level_ptr = (LogLevel) value; |
| 1657 | break; |
| 1658 | |
| 1659 | case sAllowTcpForwarding: |
| 1660 | intptr = &options->allow_tcp_forwarding; |
| 1661 | multistate_ptr = multistate_tcpfwd; |
| 1662 | goto parse_multistate; |
| 1663 | |
| 1664 | case sAllowStreamLocalForwarding: |
| 1665 | intptr = &options->allow_streamlocal_forwarding; |
| 1666 | multistate_ptr = multistate_tcpfwd; |
| 1667 | goto parse_multistate; |
| 1668 | |
| 1669 | case sAllowAgentForwarding: |
| 1670 | intptr = &options->allow_agent_forwarding; |
| 1671 | goto parse_flag; |
| 1672 | |
| 1673 | case sDisableForwarding: |
| 1674 | intptr = &options->disable_forwarding; |
| 1675 | goto parse_flag; |
| 1676 | |
| 1677 | case sAllowUsers: |
| 1678 | while ((arg = strdelim(&cp)) && *arg != '\0') { |
| 1679 | if (match_user(NULL, NULL, NULL, arg) == -1) |
| 1680 | fatal("%s line %d: invalid AllowUsers pattern: " |
| 1681 | "\"%.100s\"", filename, linenum, arg); |
| 1682 | if (!*activep) |
| 1683 | continue; |
| 1684 | array_append(filename, linenum, "AllowUsers", |
| 1685 | &options->allow_users, &options->num_allow_users, |
| 1686 | arg); |
| 1687 | } |
| 1688 | break; |
| 1689 | |
| 1690 | case sDenyUsers: |
| 1691 | while ((arg = strdelim(&cp)) && *arg != '\0') { |
| 1692 | if (match_user(NULL, NULL, NULL, arg) == -1) |
| 1693 | fatal("%s line %d: invalid DenyUsers pattern: " |
| 1694 | "\"%.100s\"", filename, linenum, arg); |
| 1695 | if (!*activep) |
| 1696 | continue; |
| 1697 | array_append(filename, linenum, "DenyUsers", |
| 1698 | &options->deny_users, &options->num_deny_users, |
| 1699 | arg); |
| 1700 | } |
| 1701 | break; |
| 1702 | |
| 1703 | case sAllowGroups: |
| 1704 | while ((arg = strdelim(&cp)) && *arg != '\0') { |
| 1705 | if (!*activep) |
| 1706 | continue; |
| 1707 | array_append(filename, linenum, "AllowGroups", |
| 1708 | &options->allow_groups, &options->num_allow_groups, |
| 1709 | arg); |
| 1710 | } |
| 1711 | break; |
| 1712 | |
| 1713 | case sDenyGroups: |
| 1714 | while ((arg = strdelim(&cp)) && *arg != '\0') { |
| 1715 | if (!*activep) |
| 1716 | continue; |
| 1717 | array_append(filename, linenum, "DenyGroups", |
| 1718 | &options->deny_groups, &options->num_deny_groups, |
| 1719 | arg); |
| 1720 | } |
| 1721 | break; |
| 1722 | |
| 1723 | case sCiphers: |
| 1724 | arg = strdelim(&cp); |
| 1725 | if (!arg || *arg == '\0') |
| 1726 | fatal("%s line %d: Missing argument.", filename, linenum); |
| 1727 | if (*arg != '-' && !ciphers_valid(*arg == '+' ? arg + 1 : arg)) |
| 1728 | fatal("%s line %d: Bad SSH2 cipher spec '%s'.", |
| 1729 | filename, linenum, arg ? arg : "<NONE>"); |
| 1730 | if (options->ciphers == NULL) |
| 1731 | options->ciphers = xstrdup(arg); |
| 1732 | break; |
| 1733 | |
| 1734 | case sMacs: |
| 1735 | arg = strdelim(&cp); |
| 1736 | if (!arg || *arg == '\0') |
| 1737 | fatal("%s line %d: Missing argument.", filename, linenum); |
| 1738 | if (*arg != '-' && !mac_valid(*arg == '+' ? arg + 1 : arg)) |
| 1739 | fatal("%s line %d: Bad SSH2 mac spec '%s'.", |
| 1740 | filename, linenum, arg ? arg : "<NONE>"); |
| 1741 | if (options->macs == NULL) |
| 1742 | options->macs = xstrdup(arg); |
| 1743 | break; |
| 1744 | |
| 1745 | case sKexAlgorithms: |
| 1746 | arg = strdelim(&cp); |
| 1747 | if (!arg || *arg == '\0') |
| 1748 | fatal("%s line %d: Missing argument.", |
| 1749 | filename, linenum); |
| 1750 | if (*arg != '-' && |
| 1751 | !kex_names_valid(*arg == '+' ? arg + 1 : arg)) |
| 1752 | fatal("%s line %d: Bad SSH2 KexAlgorithms '%s'.", |
| 1753 | filename, linenum, arg ? arg : "<NONE>"); |
| 1754 | if (options->kex_algorithms == NULL) |
| 1755 | options->kex_algorithms = xstrdup(arg); |
| 1756 | break; |
| 1757 | |
| 1758 | case sSubsystem: |
| 1759 | if (options->num_subsystems >= MAX_SUBSYSTEMS) { |
| 1760 | fatal("%s line %d: too many subsystems defined.", |
| 1761 | filename, linenum); |
| 1762 | } |
| 1763 | arg = strdelim(&cp); |
| 1764 | if (!arg || *arg == '\0') |
| 1765 | fatal("%s line %d: Missing subsystem name.", |
| 1766 | filename, linenum); |
| 1767 | if (!*activep) { |
| 1768 | arg = strdelim(&cp); |
| 1769 | break; |
| 1770 | } |
| 1771 | for (i = 0; i < options->num_subsystems; i++) |
| 1772 | if (strcmp(arg, options->subsystem_name[i]) == 0) |
| 1773 | fatal("%s line %d: Subsystem '%s' already defined.", |
| 1774 | filename, linenum, arg); |
| 1775 | options->subsystem_name[options->num_subsystems] = xstrdup(arg); |
| 1776 | arg = strdelim(&cp); |
| 1777 | if (!arg || *arg == '\0') |
| 1778 | fatal("%s line %d: Missing subsystem command.", |
| 1779 | filename, linenum); |
| 1780 | options->subsystem_command[options->num_subsystems] = xstrdup(arg); |
| 1781 | |
| 1782 | /* Collect arguments (separate to executable) */ |
| 1783 | p = xstrdup(arg); |
| 1784 | len = strlen(p) + 1; |
| 1785 | while ((arg = strdelim(&cp)) != NULL && *arg != '\0') { |
| 1786 | len += 1 + strlen(arg); |
| 1787 | p = xreallocarray(p, 1, len); |
| 1788 | strlcat(p, " ", len); |
| 1789 | strlcat(p, arg, len); |
| 1790 | } |
| 1791 | options->subsystem_args[options->num_subsystems] = p; |
| 1792 | options->num_subsystems++; |
| 1793 | break; |
| 1794 | |
| 1795 | case sMaxStartups: |
| 1796 | arg = strdelim(&cp); |
| 1797 | if (!arg || *arg == '\0') |
| 1798 | fatal("%s line %d: Missing MaxStartups spec.", |
| 1799 | filename, linenum); |
| 1800 | if ((n = sscanf(arg, "%d:%d:%d", |
| 1801 | &options->max_startups_begin, |
| 1802 | &options->max_startups_rate, |
| 1803 | &options->max_startups)) == 3) { |
| 1804 | if (options->max_startups_begin > |
| 1805 | options->max_startups || |
| 1806 | options->max_startups_rate > 100 || |
| 1807 | options->max_startups_rate < 1) |
| 1808 | fatal("%s line %d: Illegal MaxStartups spec.", |
| 1809 | filename, linenum); |
| 1810 | } else if (n != 1) |
| 1811 | fatal("%s line %d: Illegal MaxStartups spec.", |
| 1812 | filename, linenum); |
| 1813 | else |
| 1814 | options->max_startups = options->max_startups_begin; |
| 1815 | break; |
| 1816 | |
| 1817 | case sMaxAuthTries: |
| 1818 | intptr = &options->max_authtries; |
| 1819 | goto parse_int; |
| 1820 | |
| 1821 | case sMaxSessions: |
| 1822 | intptr = &options->max_sessions; |
| 1823 | goto parse_int; |
| 1824 | |
| 1825 | case sBanner: |
| 1826 | charptr = &options->banner; |
| 1827 | goto parse_filename; |
| 1828 | |
| 1829 | /* |
| 1830 | * These options can contain %X options expanded at |
| 1831 | * connect time, so that you can specify paths like: |
| 1832 | * |
| 1833 | * AuthorizedKeysFile /etc/ssh_keys/%u |
| 1834 | */ |
| 1835 | case sAuthorizedKeysFile: |
| 1836 | if (*activep && options->num_authkeys_files == 0) { |
| 1837 | while ((arg = strdelim(&cp)) && *arg != '\0') { |
| 1838 | arg = tilde_expand_filename(arg, getuid()); |
| 1839 | array_append(filename, linenum, |
| 1840 | "AuthorizedKeysFile", |
| 1841 | &options->authorized_keys_files, |
| 1842 | &options->num_authkeys_files, arg); |
| 1843 | free(arg); |
| 1844 | } |
| 1845 | } |
| 1846 | return 0; |
| 1847 | |
| 1848 | case sAuthorizedPrincipalsFile: |
| 1849 | charptr = &options->authorized_principals_file; |
| 1850 | arg = strdelim(&cp); |
| 1851 | if (!arg || *arg == '\0') |
| 1852 | fatal("%s line %d: missing file name.", |
| 1853 | filename, linenum); |
| 1854 | if (*activep && *charptr == NULL) { |
| 1855 | *charptr = tilde_expand_filename(arg, getuid()); |
| 1856 | /* increase optional counter */ |
| 1857 | if (intptr != NULL) |
| 1858 | *intptr = *intptr + 1; |
| 1859 | } |
| 1860 | break; |
| 1861 | |
| 1862 | case sClientAliveInterval: |
| 1863 | intptr = &options->client_alive_interval; |
| 1864 | goto parse_time; |
| 1865 | |
| 1866 | case sClientAliveCountMax: |
| 1867 | intptr = &options->client_alive_count_max; |
| 1868 | goto parse_int; |
| 1869 | |
| 1870 | case sAcceptEnv: |
| 1871 | while ((arg = strdelim(&cp)) && *arg != '\0') { |
| 1872 | if (strchr(arg, '=') != NULL) |
| 1873 | fatal("%s line %d: Invalid environment name.", |
| 1874 | filename, linenum); |
| 1875 | if (!*activep) |
| 1876 | continue; |
| 1877 | array_append(filename, linenum, "AcceptEnv", |
| 1878 | &options->accept_env, &options->num_accept_env, |
| 1879 | arg); |
| 1880 | } |
| 1881 | break; |
| 1882 | |
| 1883 | case sSetEnv: |
| 1884 | uvalue = options->num_setenv; |
| 1885 | while ((arg = strdelimw(&cp)) && *arg != '\0') { |
| 1886 | if (strchr(arg, '=') == NULL) |
| 1887 | fatal("%s line %d: Invalid environment.", |
| 1888 | filename, linenum); |
| 1889 | if (!*activep || uvalue != 0) |
| 1890 | continue; |
| 1891 | array_append(filename, linenum, "SetEnv", |
| 1892 | &options->setenv, &options->num_setenv, arg); |
| 1893 | } |
| 1894 | break; |
| 1895 | |
| 1896 | case sPermitTunnel: |
| 1897 | intptr = &options->permit_tun; |
| 1898 | arg = strdelim(&cp); |
| 1899 | if (!arg || *arg == '\0') |
| 1900 | fatal("%s line %d: Missing yes/point-to-point/" |
| 1901 | "ethernet/no argument.", filename, linenum); |
| 1902 | value = -1; |
| 1903 | for (i = 0; tunmode_desc[i].val != -1; i++) |
| 1904 | if (strcmp(tunmode_desc[i].text, arg) == 0) { |
| 1905 | value = tunmode_desc[i].val; |
| 1906 | break; |
| 1907 | } |
| 1908 | if (value == -1) |
| 1909 | fatal("%s line %d: Bad yes/point-to-point/ethernet/" |
| 1910 | "no argument: %s", filename, linenum, arg); |
| 1911 | if (*activep && *intptr == -1) |
| 1912 | *intptr = value; |
| 1913 | break; |
| 1914 | |
| 1915 | case sMatch: |
| 1916 | if (cmdline) |
| 1917 | fatal("Match directive not supported as a command-line " |
| 1918 | "option"); |
| 1919 | value = match_cfg_line(&cp, linenum, connectinfo); |
| 1920 | if (value < 0) |
| 1921 | fatal("%s line %d: Bad Match condition", filename, |
| 1922 | linenum); |
| 1923 | *activep = value; |
| 1924 | break; |
| 1925 | |
| 1926 | case sPermitListen: |
| 1927 | case sPermitOpen: |
| 1928 | if (opcode == sPermitListen) { |
| 1929 | uintptr = &options->num_permitted_listens; |
| 1930 | chararrayptr = &options->permitted_listens; |
| 1931 | } else { |
| 1932 | uintptr = &options->num_permitted_opens; |
| 1933 | chararrayptr = &options->permitted_opens; |
| 1934 | } |
| 1935 | arg = strdelim(&cp); |
| 1936 | if (!arg || *arg == '\0') |
| 1937 | fatal("%s line %d: missing %s specification", |
| 1938 | filename, linenum, lookup_opcode_name(opcode)); |
| 1939 | uvalue = *uintptr; /* modified later */ |
| 1940 | if (strcmp(arg, "any") == 0 || strcmp(arg, "none") == 0) { |
| 1941 | if (*activep && uvalue == 0) { |
| 1942 | *uintptr = 1; |
| 1943 | *chararrayptr = xcalloc(1, |
| 1944 | sizeof(**chararrayptr)); |
| 1945 | (*chararrayptr)[0] = xstrdup(arg); |
| 1946 | } |
| 1947 | break; |
| 1948 | } |
| 1949 | for (; arg != NULL && *arg != '\0'; arg = strdelim(&cp)) { |
| 1950 | if (opcode == sPermitListen && |
| 1951 | strchr(arg, ':') == NULL) { |
| 1952 | /* |
| 1953 | * Allow bare port number for PermitListen |
| 1954 | * to indicate a wildcard listen host. |
| 1955 | */ |
| 1956 | xasprintf(&arg2, "*:%s", arg); |
| 1957 | } else { |
| 1958 | arg2 = xstrdup(arg); |
| 1959 | ch = '\0'; |
| 1960 | p = hpdelim2(&arg, &ch); |
| 1961 | if (p == NULL || ch == '/') { |
| 1962 | fatal("%s line %d: missing host in %s", |
| 1963 | filename, linenum, |
| 1964 | lookup_opcode_name(opcode)); |
| 1965 | } |
| 1966 | p = cleanhostname(p); |
| 1967 | } |
| 1968 | if (arg == NULL || |
| 1969 | ((port = permitopen_port(arg)) < 0)) { |
| 1970 | fatal("%s line %d: bad port number in %s", |
| 1971 | filename, linenum, |
| 1972 | lookup_opcode_name(opcode)); |
| 1973 | } |
| 1974 | if (*activep && uvalue == 0) { |
| 1975 | array_append(filename, linenum, |
| 1976 | lookup_opcode_name(opcode), |
| 1977 | chararrayptr, uintptr, arg2); |
| 1978 | } |
| 1979 | free(arg2); |
| 1980 | } |
| 1981 | break; |
| 1982 | |
| 1983 | case sForceCommand: |
| 1984 | if (cp == NULL || *cp == '\0') |
| 1985 | fatal("%.200s line %d: Missing argument.", filename, |
| 1986 | linenum); |
| 1987 | len = strspn(cp, WHITESPACE); |
| 1988 | if (*activep && options->adm_forced_command == NULL) |
| 1989 | options->adm_forced_command = xstrdup(cp + len); |
| 1990 | return 0; |
| 1991 | |
| 1992 | case sChrootDirectory: |
| 1993 | charptr = &options->chroot_directory; |
| 1994 | |
| 1995 | arg = strdelim(&cp); |
| 1996 | if (!arg || *arg == '\0') |
| 1997 | fatal("%s line %d: missing file name.", |
| 1998 | filename, linenum); |
| 1999 | if (*activep && *charptr == NULL) |
| 2000 | *charptr = xstrdup(arg); |
| 2001 | break; |
| 2002 | |
| 2003 | case sTrustedUserCAKeys: |
| 2004 | charptr = &options->trusted_user_ca_keys; |
| 2005 | goto parse_filename; |
| 2006 | |
| 2007 | case sRevokedKeys: |
| 2008 | charptr = &options->revoked_keys_file; |
| 2009 | goto parse_filename; |
| 2010 | |
| 2011 | case sIPQoS: |
| 2012 | arg = strdelim(&cp); |
| 2013 | if ((value = parse_ipqos(arg)) == -1) |
| 2014 | fatal("%s line %d: Bad IPQoS value: %s", |
| 2015 | filename, linenum, arg); |
| 2016 | arg = strdelim(&cp); |
| 2017 | if (arg == NULL) |
| 2018 | value2 = value; |
| 2019 | else if ((value2 = parse_ipqos(arg)) == -1) |
| 2020 | fatal("%s line %d: Bad IPQoS value: %s", |
| 2021 | filename, linenum, arg); |
| 2022 | if (*activep) { |
| 2023 | options->ip_qos_interactive = value; |
| 2024 | options->ip_qos_bulk = value2; |
| 2025 | } |
| 2026 | break; |
| 2027 | |
| 2028 | case sVersionAddendum: |
| 2029 | if (cp == NULL || *cp == '\0') |
| 2030 | fatal("%.200s line %d: Missing argument.", filename, |
| 2031 | linenum); |
| 2032 | len = strspn(cp, WHITESPACE); |
| 2033 | if (*activep && options->version_addendum == NULL) { |
| 2034 | if (strcasecmp(cp + len, "none") == 0) |
| 2035 | options->version_addendum = xstrdup(""); |
| 2036 | else if (strchr(cp + len, '\r') != NULL) |
| 2037 | fatal("%.200s line %d: Invalid argument", |
| 2038 | filename, linenum); |
| 2039 | else |
| 2040 | options->version_addendum = xstrdup(cp + len); |
| 2041 | } |
| 2042 | return 0; |
| 2043 | |
| 2044 | case sAuthorizedKeysCommand: |
| 2045 | if (cp == NULL) |
| 2046 | fatal("%.200s line %d: Missing argument.", filename, |
| 2047 | linenum); |
| 2048 | len = strspn(cp, WHITESPACE); |
| 2049 | if (*activep && options->authorized_keys_command == NULL) { |
| 2050 | if (cp[len] != '/' && strcasecmp(cp + len, "none") != 0) |
| 2051 | fatal("%.200s line %d: AuthorizedKeysCommand " |
| 2052 | "must be an absolute path", |
| 2053 | filename, linenum); |
| 2054 | options->authorized_keys_command = xstrdup(cp + len); |
| 2055 | } |
| 2056 | return 0; |
| 2057 | |
| 2058 | case sAuthorizedKeysCommandUser: |
| 2059 | charptr = &options->authorized_keys_command_user; |
| 2060 | |
| 2061 | arg = strdelim(&cp); |
| 2062 | if (!arg || *arg == '\0') |
| 2063 | fatal("%s line %d: missing AuthorizedKeysCommandUser " |
| 2064 | "argument.", filename, linenum); |
| 2065 | if (*activep && *charptr == NULL) |
| 2066 | *charptr = xstrdup(arg); |
| 2067 | break; |
| 2068 | |
| 2069 | case sAuthorizedPrincipalsCommand: |
| 2070 | if (cp == NULL) |
| 2071 | fatal("%.200s line %d: Missing argument.", filename, |
| 2072 | linenum); |
| 2073 | len = strspn(cp, WHITESPACE); |
| 2074 | if (*activep && |
| 2075 | options->authorized_principals_command == NULL) { |
| 2076 | if (cp[len] != '/' && strcasecmp(cp + len, "none") != 0) |
| 2077 | fatal("%.200s line %d: " |
| 2078 | "AuthorizedPrincipalsCommand must be " |
| 2079 | "an absolute path", filename, linenum); |
| 2080 | options->authorized_principals_command = |
| 2081 | xstrdup(cp + len); |
| 2082 | } |
| 2083 | return 0; |
| 2084 | |
| 2085 | case sAuthorizedPrincipalsCommandUser: |
| 2086 | charptr = &options->authorized_principals_command_user; |
| 2087 | |
| 2088 | arg = strdelim(&cp); |
| 2089 | if (!arg || *arg == '\0') |
| 2090 | fatal("%s line %d: missing " |
| 2091 | "AuthorizedPrincipalsCommandUser argument.", |
| 2092 | filename, linenum); |
| 2093 | if (*activep && *charptr == NULL) |
| 2094 | *charptr = xstrdup(arg); |
| 2095 | break; |
| 2096 | |
| 2097 | case sAuthenticationMethods: |
| 2098 | if (options->num_auth_methods == 0) { |
| 2099 | value = 0; /* seen "any" pseudo-method */ |
| 2100 | value2 = 0; /* successfully parsed any method */ |
| 2101 | while ((arg = strdelim(&cp)) && *arg != '\0') { |
| 2102 | if (strcmp(arg, "any") == 0) { |
| 2103 | if (options->num_auth_methods > 0) { |
| 2104 | fatal("%s line %d: \"any\" " |
| 2105 | "must appear alone in " |
| 2106 | "AuthenticationMethods", |
| 2107 | filename, linenum); |
| 2108 | } |
| 2109 | value = 1; |
| 2110 | } else if (value) { |
| 2111 | fatal("%s line %d: \"any\" must appear " |
| 2112 | "alone in AuthenticationMethods", |
| 2113 | filename, linenum); |
| 2114 | } else if (auth2_methods_valid(arg, 0) != 0) { |
| 2115 | fatal("%s line %d: invalid " |
| 2116 | "authentication method list.", |
| 2117 | filename, linenum); |
| 2118 | } |
| 2119 | value2 = 1; |
| 2120 | if (!*activep) |
| 2121 | continue; |
| 2122 | array_append(filename, linenum, |
| 2123 | "AuthenticationMethods", |
| 2124 | &options->auth_methods, |
| 2125 | &options->num_auth_methods, arg); |
| 2126 | } |
| 2127 | if (value2 == 0) { |
| 2128 | fatal("%s line %d: no AuthenticationMethods " |
| 2129 | "specified", filename, linenum); |
| 2130 | } |
| 2131 | } |
| 2132 | return 0; |
| 2133 | |
| 2134 | case sStreamLocalBindMask: |
| 2135 | arg = strdelim(&cp); |
| 2136 | if (!arg || *arg == '\0') |
| 2137 | fatal("%s line %d: missing StreamLocalBindMask " |
| 2138 | "argument.", filename, linenum); |
| 2139 | /* Parse mode in octal format */ |
| 2140 | value = strtol(arg, &p, 8); |
| 2141 | if (arg == p || value < 0 || value > 0777) |
| 2142 | fatal("%s line %d: Bad mask.", filename, linenum); |
| 2143 | if (*activep) |
| 2144 | options->fwd_opts.streamlocal_bind_mask = (mode_t)value; |
| 2145 | break; |
| 2146 | |
| 2147 | case sStreamLocalBindUnlink: |
| 2148 | intptr = &options->fwd_opts.streamlocal_bind_unlink; |
| 2149 | goto parse_flag; |
| 2150 | |
| 2151 | case sFingerprintHash: |
| 2152 | arg = strdelim(&cp); |
| 2153 | if (!arg || *arg == '\0') |
| 2154 | fatal("%.200s line %d: Missing argument.", |
| 2155 | filename, linenum); |
| 2156 | if ((value = ssh_digest_alg_by_name(arg)) == -1) |
| 2157 | fatal("%.200s line %d: Invalid hash algorithm \"%s\".", |
| 2158 | filename, linenum, arg); |
| 2159 | if (*activep) |
| 2160 | options->fingerprint_hash = value; |
| 2161 | break; |
| 2162 | |
| 2163 | case sExposeAuthInfo: |
| 2164 | intptr = &options->expose_userauth_info; |
| 2165 | goto parse_flag; |
| 2166 | |
| 2167 | case sRDomain: |
| 2168 | charptr = &options->routing_domain; |
| 2169 | arg = strdelim(&cp); |
| 2170 | if (!arg || *arg == '\0') |
| 2171 | fatal("%.200s line %d: Missing argument.", |
| 2172 | filename, linenum); |
| 2173 | if (strcasecmp(arg, "none") != 0 && strcmp(arg, "%D") != 0 && |
| 2174 | !valid_rdomain(arg)) |
| 2175 | fatal("%s line %d: bad routing domain", |
| 2176 | filename, linenum); |
| 2177 | if (*activep && *charptr == NULL) |
| 2178 | *charptr = xstrdup(arg); |
| 2179 | break; |
| 2180 | |
| 2181 | case sDeprecated: |
| 2182 | case sIgnore: |
| 2183 | case sUnsupported: |
| 2184 | do_log2(opcode == sIgnore ? |
| 2185 | SYSLOG_LEVEL_DEBUG2 : SYSLOG_LEVEL_INFO, |
| 2186 | "%s line %d: %s option %s", filename, linenum, |
| 2187 | opcode == sUnsupported ? "Unsupported" : "Deprecated", arg); |
| 2188 | while (arg) |
| 2189 | arg = strdelim(&cp); |
| 2190 | break; |
| 2191 | |
| 2192 | default: |
| 2193 | fatal("%s line %d: Missing handler for opcode %s (%d)", |
| 2194 | filename, linenum, arg, opcode); |
| 2195 | } |
| 2196 | if ((arg = strdelim(&cp)) != NULL && *arg != '\0') |
| 2197 | fatal("%s line %d: garbage at end of line; \"%.200s\".", |
| 2198 | filename, linenum, arg); |
| 2199 | return 0; |
| 2200 | } |
| 2201 | |
| 2202 | /* Reads the server configuration file. */ |
| 2203 | |
| 2204 | void |
| 2205 | load_server_config(const char *filename, struct sshbuf *conf) |
| 2206 | { |
| 2207 | char *line = NULL, *cp; |
| 2208 | size_t linesize = 0; |
| 2209 | FILE *f; |
| 2210 | int r, lineno = 0; |
| 2211 | |
| 2212 | debug2("%s: filename %s", __func__, filename); |
| 2213 | if ((f = fopen(filename, "r")) == NULL) { |
| 2214 | perror(filename); |
| 2215 | exit(1); |
| 2216 | } |
| 2217 | sshbuf_reset(conf); |
| 2218 | while (getline(&line, &linesize, f) != -1) { |
| 2219 | lineno++; |
| 2220 | /* |
| 2221 | * Trim out comments and strip whitespace |
| 2222 | * NB - preserve newlines, they are needed to reproduce |
| 2223 | * line numbers later for error messages |
| 2224 | */ |
| 2225 | if ((cp = strchr(line, '#')) != NULL) |
| 2226 | memcpy(cp, "\n", 2); |
| 2227 | cp = line + strspn(line, " \t\r"); |
| 2228 | if ((r = sshbuf_put(conf, cp, strlen(cp))) != 0) |
| 2229 | fatal("%s: buffer error: %s", __func__, ssh_err(r)); |
| 2230 | } |
| 2231 | free(line); |
| 2232 | if ((r = sshbuf_put_u8(conf, 0)) != 0) |
| 2233 | fatal("%s: buffer error: %s", __func__, ssh_err(r)); |
| 2234 | fclose(f); |
| 2235 | debug2("%s: done config len = %zu", __func__, sshbuf_len(conf)); |
| 2236 | } |
| 2237 | |
| 2238 | void |
| 2239 | parse_server_match_config(ServerOptions *options, |
| 2240 | struct connection_info *connectinfo) |
| 2241 | { |
| 2242 | ServerOptions mo; |
| 2243 | |
| 2244 | initialize_server_options(&mo); |
| 2245 | parse_server_config(&mo, "reprocess config", cfg, connectinfo); |
| 2246 | copy_set_server_options(options, &mo, 0); |
| 2247 | } |
| 2248 | |
| 2249 | int parse_server_match_testspec(struct connection_info *ci, char *spec) |
| 2250 | { |
| 2251 | char *p; |
| 2252 | |
| 2253 | while ((p = strsep(&spec, ",")) && *p != '\0') { |
| 2254 | if (strncmp(p, "addr=", 5) == 0) { |
| 2255 | ci->address = xstrdup(p + 5); |
| 2256 | } else if (strncmp(p, "host=", 5) == 0) { |
| 2257 | ci->host = xstrdup(p + 5); |
| 2258 | } else if (strncmp(p, "user=", 5) == 0) { |
| 2259 | ci->user = xstrdup(p + 5); |
| 2260 | } else if (strncmp(p, "laddr=", 6) == 0) { |
| 2261 | ci->laddress = xstrdup(p + 6); |
| 2262 | } else if (strncmp(p, "rdomain=", 8) == 0) { |
| 2263 | ci->rdomain = xstrdup(p + 8); |
| 2264 | } else if (strncmp(p, "lport=", 6) == 0) { |
| 2265 | ci->lport = a2port(p + 6); |
| 2266 | if (ci->lport == -1) { |
| 2267 | fprintf(stderr, "Invalid port '%s' in test mode" |
| 2268 | " specification %s\n", p+6, p); |
| 2269 | return -1; |
| 2270 | } |
| 2271 | } else { |
| 2272 | fprintf(stderr, "Invalid test mode specification %s\n", |
| 2273 | p); |
| 2274 | return -1; |
| 2275 | } |
| 2276 | } |
| 2277 | return 0; |
| 2278 | } |
| 2279 | |
| 2280 | /* |
| 2281 | * Copy any supported values that are set. |
| 2282 | * |
| 2283 | * If the preauth flag is set, we do not bother copying the string or |
| 2284 | * array values that are not used pre-authentication, because any that we |
| 2285 | * do use must be explicitly sent in mm_getpwnamallow(). |
| 2286 | */ |
| 2287 | void |
| 2288 | copy_set_server_options(ServerOptions *dst, ServerOptions *src, int preauth) |
| 2289 | { |
| 2290 | #define M_CP_INTOPT(n) do {\ |
| 2291 | if (src->n != -1) \ |
| 2292 | dst->n = src->n; \ |
| 2293 | } while (0) |
| 2294 | |
| 2295 | M_CP_INTOPT(password_authentication); |
| 2296 | M_CP_INTOPT(gss_authentication); |
| 2297 | M_CP_INTOPT(pubkey_authentication); |
| 2298 | M_CP_INTOPT(kerberos_authentication); |
| 2299 | M_CP_INTOPT(hostbased_authentication); |
| 2300 | M_CP_INTOPT(hostbased_uses_name_from_packet_only); |
| 2301 | M_CP_INTOPT(kbd_interactive_authentication); |
| 2302 | M_CP_INTOPT(permit_root_login); |
| 2303 | M_CP_INTOPT(permit_empty_passwd); |
| 2304 | |
| 2305 | M_CP_INTOPT(allow_tcp_forwarding); |
| 2306 | M_CP_INTOPT(allow_streamlocal_forwarding); |
| 2307 | M_CP_INTOPT(allow_agent_forwarding); |
| 2308 | M_CP_INTOPT(disable_forwarding); |
| 2309 | M_CP_INTOPT(expose_userauth_info); |
| 2310 | M_CP_INTOPT(permit_tun); |
| 2311 | M_CP_INTOPT(fwd_opts.gateway_ports); |
| 2312 | M_CP_INTOPT(fwd_opts.streamlocal_bind_unlink); |
| 2313 | M_CP_INTOPT(x11_display_offset); |
| 2314 | M_CP_INTOPT(x11_forwarding); |
| 2315 | M_CP_INTOPT(x11_use_localhost); |
| 2316 | M_CP_INTOPT(permit_tty); |
| 2317 | M_CP_INTOPT(permit_user_rc); |
| 2318 | M_CP_INTOPT(max_sessions); |
| 2319 | M_CP_INTOPT(max_authtries); |
| 2320 | M_CP_INTOPT(client_alive_count_max); |
| 2321 | M_CP_INTOPT(client_alive_interval); |
| 2322 | M_CP_INTOPT(ip_qos_interactive); |
| 2323 | M_CP_INTOPT(ip_qos_bulk); |
| 2324 | M_CP_INTOPT(rekey_limit); |
| 2325 | M_CP_INTOPT(rekey_interval); |
| 2326 | M_CP_INTOPT(log_level); |
| 2327 | |
| 2328 | /* |
| 2329 | * The bind_mask is a mode_t that may be unsigned, so we can't use |
| 2330 | * M_CP_INTOPT - it does a signed comparison that causes compiler |
| 2331 | * warnings. |
| 2332 | */ |
| 2333 | if (src->fwd_opts.streamlocal_bind_mask != (mode_t)-1) { |
| 2334 | dst->fwd_opts.streamlocal_bind_mask = |
| 2335 | src->fwd_opts.streamlocal_bind_mask; |
| 2336 | } |
| 2337 | |
| 2338 | /* M_CP_STROPT and M_CP_STRARRAYOPT should not appear before here */ |
| 2339 | #define M_CP_STROPT(n) do {\ |
| 2340 | if (src->n != NULL && dst->n != src->n) { \ |
| 2341 | free(dst->n); \ |
| 2342 | dst->n = src->n; \ |
| 2343 | } \ |
| 2344 | } while(0) |
| 2345 | #define M_CP_STRARRAYOPT(s, num_s) do {\ |
| 2346 | u_int i; \ |
| 2347 | if (src->num_s != 0) { \ |
| 2348 | for (i = 0; i < dst->num_s; i++) \ |
| 2349 | free(dst->s[i]); \ |
| 2350 | free(dst->s); \ |
| 2351 | dst->s = xcalloc(src->num_s, sizeof(*dst->s)); \ |
| 2352 | for (i = 0; i < src->num_s; i++) \ |
| 2353 | dst->s[i] = xstrdup(src->s[i]); \ |
| 2354 | dst->num_s = src->num_s; \ |
| 2355 | } \ |
| 2356 | } while(0) |
| 2357 | |
| 2358 | /* See comment in servconf.h */ |
| 2359 | COPY_MATCH_STRING_OPTS(); |
| 2360 | |
| 2361 | /* Arguments that accept '+...' need to be expanded */ |
| 2362 | assemble_algorithms(dst); |
| 2363 | |
| 2364 | /* |
| 2365 | * The only things that should be below this point are string options |
| 2366 | * which are only used after authentication. |
| 2367 | */ |
| 2368 | if (preauth) |
| 2369 | return; |
| 2370 | |
| 2371 | /* These options may be "none" to clear a global setting */ |
| 2372 | M_CP_STROPT(adm_forced_command); |
| 2373 | if (option_clear_or_none(dst->adm_forced_command)) { |
| 2374 | free(dst->adm_forced_command); |
| 2375 | dst->adm_forced_command = NULL; |
| 2376 | } |
| 2377 | M_CP_STROPT(chroot_directory); |
| 2378 | if (option_clear_or_none(dst->chroot_directory)) { |
| 2379 | free(dst->chroot_directory); |
| 2380 | dst->chroot_directory = NULL; |
| 2381 | } |
| 2382 | } |
| 2383 | |
| 2384 | #undef M_CP_INTOPT |
| 2385 | #undef M_CP_STROPT |
| 2386 | #undef M_CP_STRARRAYOPT |
| 2387 | |
| 2388 | void |
| 2389 | parse_server_config(ServerOptions *options, const char *filename, |
| 2390 | struct sshbuf *conf, struct connection_info *connectinfo) |
| 2391 | { |
| 2392 | int active, linenum, bad_options = 0; |
| 2393 | char *cp, *obuf, *cbuf; |
| 2394 | |
| 2395 | debug2("%s: config %s len %zu", __func__, filename, sshbuf_len(conf)); |
| 2396 | |
| 2397 | if ((obuf = cbuf = sshbuf_dup_string(conf)) == NULL) |
| 2398 | fatal("%s: sshbuf_dup_string failed", __func__); |
| 2399 | active = connectinfo ? 0 : 1; |
| 2400 | linenum = 1; |
| 2401 | while ((cp = strsep(&cbuf, "\n")) != NULL) { |
| 2402 | if (process_server_config_line(options, cp, filename, |
| 2403 | linenum++, &active, connectinfo) != 0) |
| 2404 | bad_options++; |
| 2405 | } |
| 2406 | free(obuf); |
| 2407 | if (bad_options > 0) |
| 2408 | fatal("%s: terminating, %d bad configuration options", |
| 2409 | filename, bad_options); |
| 2410 | process_queued_listen_addrs(options); |
| 2411 | } |
| 2412 | |
| 2413 | static const char * |
| 2414 | fmt_multistate_int(int val, const struct multistate *m) |
| 2415 | { |
| 2416 | u_int i; |
| 2417 | |
| 2418 | for (i = 0; m[i].key != NULL; i++) { |
| 2419 | if (m[i].value == val) |
| 2420 | return m[i].key; |
| 2421 | } |
| 2422 | return "UNKNOWN"; |
| 2423 | } |
| 2424 | |
| 2425 | static const char * |
| 2426 | fmt_intarg(ServerOpCodes code, int val) |
| 2427 | { |
| 2428 | if (val == -1) |
| 2429 | return "unset"; |
| 2430 | switch (code) { |
| 2431 | case sAddressFamily: |
| 2432 | return fmt_multistate_int(val, multistate_addressfamily); |
| 2433 | case sPermitRootLogin: |
| 2434 | return fmt_multistate_int(val, multistate_permitrootlogin); |
| 2435 | case sGatewayPorts: |
| 2436 | return fmt_multistate_int(val, multistate_gatewayports); |
| 2437 | case sCompression: |
| 2438 | return fmt_multistate_int(val, multistate_compression); |
| 2439 | case sAllowTcpForwarding: |
| 2440 | return fmt_multistate_int(val, multistate_tcpfwd); |
| 2441 | case sAllowStreamLocalForwarding: |
| 2442 | return fmt_multistate_int(val, multistate_tcpfwd); |
| 2443 | case sFingerprintHash: |
| 2444 | return ssh_digest_alg_name(val); |
| 2445 | default: |
| 2446 | switch (val) { |
| 2447 | case 0: |
| 2448 | return "no"; |
| 2449 | case 1: |
| 2450 | return "yes"; |
| 2451 | default: |
| 2452 | return "UNKNOWN"; |
| 2453 | } |
| 2454 | } |
| 2455 | } |
| 2456 | |
| 2457 | static void |
| 2458 | dump_cfg_int(ServerOpCodes code, int val) |
| 2459 | { |
| 2460 | printf("%s %d\n", lookup_opcode_name(code), val); |
| 2461 | } |
| 2462 | |
| 2463 | static void |
| 2464 | dump_cfg_oct(ServerOpCodes code, int val) |
| 2465 | { |
| 2466 | printf("%s 0%o\n", lookup_opcode_name(code), val); |
| 2467 | } |
| 2468 | |
| 2469 | static void |
| 2470 | dump_cfg_fmtint(ServerOpCodes code, int val) |
| 2471 | { |
| 2472 | printf("%s %s\n", lookup_opcode_name(code), fmt_intarg(code, val)); |
| 2473 | } |
| 2474 | |
| 2475 | static void |
| 2476 | dump_cfg_string(ServerOpCodes code, const char *val) |
| 2477 | { |
| 2478 | printf("%s %s\n", lookup_opcode_name(code), |
| 2479 | val == NULL ? "none" : val); |
| 2480 | } |
| 2481 | |
| 2482 | static void |
| 2483 | dump_cfg_strarray(ServerOpCodes code, u_int count, char **vals) |
| 2484 | { |
| 2485 | u_int i; |
| 2486 | |
| 2487 | for (i = 0; i < count; i++) |
| 2488 | printf("%s %s\n", lookup_opcode_name(code), vals[i]); |
| 2489 | } |
| 2490 | |
| 2491 | static void |
| 2492 | dump_cfg_strarray_oneline(ServerOpCodes code, u_int count, char **vals) |
| 2493 | { |
| 2494 | u_int i; |
| 2495 | |
| 2496 | if (count <= 0 && code != sAuthenticationMethods) |
| 2497 | return; |
| 2498 | printf("%s", lookup_opcode_name(code)); |
| 2499 | for (i = 0; i < count; i++) |
| 2500 | printf(" %s", vals[i]); |
| 2501 | if (code == sAuthenticationMethods && count == 0) |
| 2502 | printf(" any"); |
| 2503 | printf("\n"); |
| 2504 | } |
| 2505 | |
| 2506 | static char * |
| 2507 | format_listen_addrs(struct listenaddr *la) |
| 2508 | { |
| 2509 | int r; |
| 2510 | struct addrinfo *ai; |
| 2511 | char addr[NI_MAXHOST], port[NI_MAXSERV]; |
| 2512 | char *laddr1 = xstrdup(""), *laddr2 = NULL; |
| 2513 | |
| 2514 | /* |
| 2515 | * ListenAddress must be after Port. add_one_listen_addr pushes |
| 2516 | * addresses onto a stack, so to maintain ordering we need to |
| 2517 | * print these in reverse order. |
| 2518 | */ |
| 2519 | for (ai = la->addrs; ai; ai = ai->ai_next) { |
| 2520 | if ((r = getnameinfo(ai->ai_addr, ai->ai_addrlen, addr, |
| 2521 | sizeof(addr), port, sizeof(port), |
| 2522 | NI_NUMERICHOST|NI_NUMERICSERV)) != 0) { |
| 2523 | error("getnameinfo: %.100s", ssh_gai_strerror(r)); |
| 2524 | continue; |
| 2525 | } |
| 2526 | laddr2 = laddr1; |
| 2527 | if (ai->ai_family == AF_INET6) { |
| 2528 | xasprintf(&laddr1, "listenaddress [%s]:%s%s%s\n%s", |
| 2529 | addr, port, |
| 2530 | la->rdomain == NULL ? "" : " rdomain ", |
| 2531 | la->rdomain == NULL ? "" : la->rdomain, |
| 2532 | laddr2); |
| 2533 | } else { |
| 2534 | xasprintf(&laddr1, "listenaddress %s:%s%s%s\n%s", |
| 2535 | addr, port, |
| 2536 | la->rdomain == NULL ? "" : " rdomain ", |
| 2537 | la->rdomain == NULL ? "" : la->rdomain, |
| 2538 | laddr2); |
| 2539 | } |
| 2540 | free(laddr2); |
| 2541 | } |
| 2542 | return laddr1; |
| 2543 | } |
| 2544 | |
| 2545 | void |
| 2546 | dump_config(ServerOptions *o) |
| 2547 | { |
| 2548 | char *s; |
| 2549 | u_int i; |
| 2550 | |
| 2551 | /* these are usually at the top of the config */ |
| 2552 | for (i = 0; i < o->num_ports; i++) |
| 2553 | printf("port %d\n", o->ports[i]); |
| 2554 | dump_cfg_fmtint(sAddressFamily, o->address_family); |
| 2555 | |
| 2556 | for (i = 0; i < o->num_listen_addrs; i++) { |
| 2557 | s = format_listen_addrs(&o->listen_addrs[i]); |
| 2558 | printf("%s", s); |
| 2559 | free(s); |
| 2560 | } |
| 2561 | |
| 2562 | /* integer arguments */ |
| 2563 | #ifdef USE_PAM |
| 2564 | dump_cfg_fmtint(sUsePAM, o->use_pam); |
| 2565 | #endif |
| 2566 | dump_cfg_int(sLoginGraceTime, o->login_grace_time); |
| 2567 | dump_cfg_int(sX11DisplayOffset, o->x11_display_offset); |
| 2568 | dump_cfg_int(sMaxAuthTries, o->max_authtries); |
| 2569 | dump_cfg_int(sMaxSessions, o->max_sessions); |
| 2570 | dump_cfg_int(sClientAliveInterval, o->client_alive_interval); |
| 2571 | dump_cfg_int(sClientAliveCountMax, o->client_alive_count_max); |
| 2572 | dump_cfg_oct(sStreamLocalBindMask, o->fwd_opts.streamlocal_bind_mask); |
| 2573 | |
| 2574 | /* formatted integer arguments */ |
| 2575 | dump_cfg_fmtint(sPermitRootLogin, o->permit_root_login); |
| 2576 | dump_cfg_fmtint(sIgnoreRhosts, o->ignore_rhosts); |
| 2577 | dump_cfg_fmtint(sIgnoreUserKnownHosts, o->ignore_user_known_hosts); |
| 2578 | dump_cfg_fmtint(sHostbasedAuthentication, o->hostbased_authentication); |
| 2579 | dump_cfg_fmtint(sHostbasedUsesNameFromPacketOnly, |
| 2580 | o->hostbased_uses_name_from_packet_only); |
| 2581 | dump_cfg_fmtint(sPubkeyAuthentication, o->pubkey_authentication); |
| 2582 | #ifdef KRB5 |
| 2583 | dump_cfg_fmtint(sKerberosAuthentication, o->kerberos_authentication); |
| 2584 | dump_cfg_fmtint(sKerberosOrLocalPasswd, o->kerberos_or_local_passwd); |
| 2585 | dump_cfg_fmtint(sKerberosTicketCleanup, o->kerberos_ticket_cleanup); |
| 2586 | # ifdef USE_AFS |
| 2587 | dump_cfg_fmtint(sKerberosGetAFSToken, o->kerberos_get_afs_token); |
| 2588 | # endif |
| 2589 | #endif |
| 2590 | #ifdef GSSAPI |
| 2591 | dump_cfg_fmtint(sGssAuthentication, o->gss_authentication); |
| 2592 | dump_cfg_fmtint(sGssCleanupCreds, o->gss_cleanup_creds); |
| 2593 | #endif |
| 2594 | dump_cfg_fmtint(sPasswordAuthentication, o->password_authentication); |
| 2595 | dump_cfg_fmtint(sKbdInteractiveAuthentication, |
| 2596 | o->kbd_interactive_authentication); |
| 2597 | dump_cfg_fmtint(sChallengeResponseAuthentication, |
| 2598 | o->challenge_response_authentication); |
| 2599 | dump_cfg_fmtint(sPrintMotd, o->print_motd); |
| 2600 | #ifndef DISABLE_LASTLOG |
| 2601 | dump_cfg_fmtint(sPrintLastLog, o->print_lastlog); |
| 2602 | #endif |
| 2603 | dump_cfg_fmtint(sX11Forwarding, o->x11_forwarding); |
| 2604 | dump_cfg_fmtint(sX11UseLocalhost, o->x11_use_localhost); |
| 2605 | dump_cfg_fmtint(sPermitTTY, o->permit_tty); |
| 2606 | dump_cfg_fmtint(sPermitUserRC, o->permit_user_rc); |
| 2607 | dump_cfg_fmtint(sStrictModes, o->strict_modes); |
| 2608 | dump_cfg_fmtint(sTCPKeepAlive, o->tcp_keep_alive); |
| 2609 | dump_cfg_fmtint(sEmptyPasswd, o->permit_empty_passwd); |
| 2610 | dump_cfg_fmtint(sCompression, o->compression); |
| 2611 | dump_cfg_fmtint(sGatewayPorts, o->fwd_opts.gateway_ports); |
| 2612 | dump_cfg_fmtint(sUseDNS, o->use_dns); |
| 2613 | dump_cfg_fmtint(sAllowTcpForwarding, o->allow_tcp_forwarding); |
| 2614 | dump_cfg_fmtint(sAllowAgentForwarding, o->allow_agent_forwarding); |
| 2615 | dump_cfg_fmtint(sDisableForwarding, o->disable_forwarding); |
| 2616 | dump_cfg_fmtint(sAllowStreamLocalForwarding, o->allow_streamlocal_forwarding); |
| 2617 | dump_cfg_fmtint(sStreamLocalBindUnlink, o->fwd_opts.streamlocal_bind_unlink); |
| 2618 | dump_cfg_fmtint(sFingerprintHash, o->fingerprint_hash); |
| 2619 | dump_cfg_fmtint(sExposeAuthInfo, o->expose_userauth_info); |
| 2620 | |
| 2621 | /* string arguments */ |
| 2622 | dump_cfg_string(sPidFile, o->pid_file); |
| 2623 | dump_cfg_string(sXAuthLocation, o->xauth_location); |
| 2624 | dump_cfg_string(sCiphers, o->ciphers ? o->ciphers : KEX_SERVER_ENCRYPT); |
| 2625 | dump_cfg_string(sMacs, o->macs ? o->macs : KEX_SERVER_MAC); |
| 2626 | dump_cfg_string(sBanner, o->banner); |
| 2627 | dump_cfg_string(sForceCommand, o->adm_forced_command); |
| 2628 | dump_cfg_string(sChrootDirectory, o->chroot_directory); |
| 2629 | dump_cfg_string(sTrustedUserCAKeys, o->trusted_user_ca_keys); |
| 2630 | dump_cfg_string(sRevokedKeys, o->revoked_keys_file); |
| 2631 | dump_cfg_string(sAuthorizedPrincipalsFile, |
| 2632 | o->authorized_principals_file); |
| 2633 | dump_cfg_string(sVersionAddendum, *o->version_addendum == '\0' |
| 2634 | ? "none" : o->version_addendum); |
| 2635 | dump_cfg_string(sAuthorizedKeysCommand, o->authorized_keys_command); |
| 2636 | dump_cfg_string(sAuthorizedKeysCommandUser, o->authorized_keys_command_user); |
| 2637 | dump_cfg_string(sAuthorizedPrincipalsCommand, o->authorized_principals_command); |
| 2638 | dump_cfg_string(sAuthorizedPrincipalsCommandUser, o->authorized_principals_command_user); |
| 2639 | dump_cfg_string(sHostKeyAgent, o->host_key_agent); |
| 2640 | dump_cfg_string(sKexAlgorithms, |
| 2641 | o->kex_algorithms ? o->kex_algorithms : KEX_SERVER_KEX); |
| 2642 | dump_cfg_string(sCASignatureAlgorithms, o->ca_sign_algorithms ? |
| 2643 | o->ca_sign_algorithms : SSH_ALLOWED_CA_SIGALGS); |
| 2644 | dump_cfg_string(sHostbasedAcceptedKeyTypes, o->hostbased_key_types ? |
| 2645 | o->hostbased_key_types : KEX_DEFAULT_PK_ALG); |
| 2646 | dump_cfg_string(sHostKeyAlgorithms, o->hostkeyalgorithms ? |
| 2647 | o->hostkeyalgorithms : KEX_DEFAULT_PK_ALG); |
| 2648 | dump_cfg_string(sPubkeyAcceptedKeyTypes, o->pubkey_key_types ? |
| 2649 | o->pubkey_key_types : KEX_DEFAULT_PK_ALG); |
| 2650 | dump_cfg_string(sRDomain, o->routing_domain); |
| 2651 | |
| 2652 | /* string arguments requiring a lookup */ |
| 2653 | dump_cfg_string(sLogLevel, log_level_name(o->log_level)); |
| 2654 | dump_cfg_string(sLogFacility, log_facility_name(o->log_facility)); |
| 2655 | |
| 2656 | /* string array arguments */ |
| 2657 | dump_cfg_strarray_oneline(sAuthorizedKeysFile, o->num_authkeys_files, |
| 2658 | o->authorized_keys_files); |
| 2659 | dump_cfg_strarray(sHostKeyFile, o->num_host_key_files, |
| 2660 | o->host_key_files); |
| 2661 | dump_cfg_strarray(sHostCertificate, o->num_host_cert_files, |
| 2662 | o->host_cert_files); |
| 2663 | dump_cfg_strarray(sAllowUsers, o->num_allow_users, o->allow_users); |
| 2664 | dump_cfg_strarray(sDenyUsers, o->num_deny_users, o->deny_users); |
| 2665 | dump_cfg_strarray(sAllowGroups, o->num_allow_groups, o->allow_groups); |
| 2666 | dump_cfg_strarray(sDenyGroups, o->num_deny_groups, o->deny_groups); |
| 2667 | dump_cfg_strarray(sAcceptEnv, o->num_accept_env, o->accept_env); |
| 2668 | dump_cfg_strarray(sSetEnv, o->num_setenv, o->setenv); |
| 2669 | dump_cfg_strarray_oneline(sAuthenticationMethods, |
| 2670 | o->num_auth_methods, o->auth_methods); |
| 2671 | |
| 2672 | /* other arguments */ |
| 2673 | for (i = 0; i < o->num_subsystems; i++) |
| 2674 | printf("subsystem %s %s\n", o->subsystem_name[i], |
| 2675 | o->subsystem_args[i]); |
| 2676 | |
| 2677 | printf("maxstartups %d:%d:%d\n", o->max_startups_begin, |
| 2678 | o->max_startups_rate, o->max_startups); |
| 2679 | |
| 2680 | s = NULL; |
| 2681 | for (i = 0; tunmode_desc[i].val != -1; i++) { |
| 2682 | if (tunmode_desc[i].val == o->permit_tun) { |
| 2683 | s = tunmode_desc[i].text; |
| 2684 | break; |
| 2685 | } |
| 2686 | } |
| 2687 | dump_cfg_string(sPermitTunnel, s); |
| 2688 | |
| 2689 | printf("ipqos %s ", iptos2str(o->ip_qos_interactive)); |
| 2690 | printf("%s\n", iptos2str(o->ip_qos_bulk)); |
| 2691 | |
| 2692 | printf("rekeylimit %llu %d\n", (unsigned long long)o->rekey_limit, |
| 2693 | o->rekey_interval); |
| 2694 | |
| 2695 | printf("permitopen"); |
| 2696 | if (o->num_permitted_opens == 0) |
| 2697 | printf(" any"); |
| 2698 | else { |
| 2699 | for (i = 0; i < o->num_permitted_opens; i++) |
| 2700 | printf(" %s", o->permitted_opens[i]); |
| 2701 | } |
| 2702 | printf("\n"); |
| 2703 | printf("permitlisten"); |
| 2704 | if (o->num_permitted_listens == 0) |
| 2705 | printf(" any"); |
| 2706 | else { |
| 2707 | for (i = 0; i < o->num_permitted_listens; i++) |
| 2708 | printf(" %s", o->permitted_listens[i]); |
| 2709 | } |
| 2710 | printf("\n"); |
| 2711 | |
| 2712 | if (o->permit_user_env_whitelist == NULL) { |
| 2713 | dump_cfg_fmtint(sPermitUserEnvironment, o->permit_user_env); |
| 2714 | } else { |
| 2715 | printf("permituserenvironment %s\n", |
| 2716 | o->permit_user_env_whitelist); |
| 2717 | } |
| 2718 | |
| 2719 | } |