diff options
Diffstat (limited to 'servconf.c')
| -rw-r--r-- | servconf.c | 2690 |
1 files changed, 2690 insertions, 0 deletions
diff --git a/servconf.c b/servconf.c new file mode 100644 index 0000000..932d363 --- /dev/null +++ b/servconf.c @@ -0,0 +1,2690 @@ + +/* $OpenBSD: servconf.c,v 1.342 2018/09/20 23:40:16 djm Exp $ */ +/* + * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland + * All rights reserved + * + * As far as I am concerned, the code I have written for this software + * can be used freely for any purpose. Any derived versions of this + * software must be clearly marked as such, and if the derived work is + * incompatible with the protocol description in the RFC file, it must be + * called by a name other than "ssh" or "Secure Shell". + */ + +#include "includes.h" + +#include <sys/types.h> +#include <sys/socket.h> +#ifdef HAVE_SYS_SYSCTL_H +#include <sys/sysctl.h> +#endif + +#include <netinet/in.h> +#include <netinet/in_systm.h> +#include <netinet/ip.h> +#ifdef HAVE_NET_ROUTE_H +#include <net/route.h> +#endif + +#include <ctype.h> +#include <netdb.h> +#include <pwd.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <signal.h> +#include <unistd.h> +#include <limits.h> +#include <stdarg.h> +#include <errno.h> +#ifdef HAVE_UTIL_H +#include <util.h> +#endif + +#include "openbsd-compat/sys-queue.h" +#include "xmalloc.h" +#include "ssh.h" +#include "log.h" +#include "sshbuf.h" +#include "misc.h" +#include "servconf.h" +#include "compat.h" +#include "pathnames.h" +#include "cipher.h" +#include "sshkey.h" +#include "kex.h" +#include "mac.h" +#include "match.h" +#include "channels.h" +#include "groupaccess.h" +#include "canohost.h" +#include "packet.h" +#include "ssherr.h" +#include "hostfile.h" +#include "auth.h" +#include "myproposal.h" +#include "digest.h" + +static void add_listen_addr(ServerOptions *, const char *, + const char *, int); +static void add_one_listen_addr(ServerOptions *, const char *, + const char *, int); + +/* Use of privilege separation or not */ +extern int use_privsep; +extern struct sshbuf *cfg; + +/* Initializes the server options to their default values. */ + +void +initialize_server_options(ServerOptions *options) +{ + memset(options, 0, sizeof(*options)); + + /* Portable-specific options */ + options->use_pam = -1; + + /* Standard Options */ + options->num_ports = 0; + options->ports_from_cmdline = 0; + options->queued_listen_addrs = NULL; + options->num_queued_listens = 0; + options->listen_addrs = NULL; + options->num_listen_addrs = 0; + options->address_family = -1; + options->routing_domain = NULL; + options->num_host_key_files = 0; + options->num_host_cert_files = 0; + options->host_key_agent = NULL; + options->pid_file = NULL; + options->login_grace_time = -1; + options->permit_root_login = PERMIT_NOT_SET; + options->ignore_rhosts = -1; + options->ignore_user_known_hosts = -1; + options->print_motd = -1; + options->print_lastlog = -1; + options->x11_forwarding = -1; + options->x11_display_offset = -1; + options->x11_use_localhost = -1; + options->permit_tty = -1; + options->permit_user_rc = -1; + options->xauth_location = NULL; + options->strict_modes = -1; + options->tcp_keep_alive = -1; + options->log_facility = SYSLOG_FACILITY_NOT_SET; + options->log_level = SYSLOG_LEVEL_NOT_SET; + options->hostbased_authentication = -1; + options->hostbased_uses_name_from_packet_only = -1; + options->hostbased_key_types = NULL; + options->hostkeyalgorithms = NULL; + options->pubkey_authentication = -1; + options->pubkey_key_types = NULL; + options->kerberos_authentication = -1; + options->kerberos_or_local_passwd = -1; + options->kerberos_ticket_cleanup = -1; + options->kerberos_get_afs_token = -1; + options->gss_authentication=-1; + options->gss_cleanup_creds = -1; + options->gss_strict_acceptor = -1; + options->password_authentication = -1; + options->kbd_interactive_authentication = -1; + options->challenge_response_authentication = -1; + options->permit_empty_passwd = -1; + options->permit_user_env = -1; + options->permit_user_env_whitelist = NULL; + options->compression = -1; + options->rekey_limit = -1; + options->rekey_interval = -1; + options->allow_tcp_forwarding = -1; + options->allow_streamlocal_forwarding = -1; + options->allow_agent_forwarding = -1; + options->num_allow_users = 0; + options->num_deny_users = 0; + options->num_allow_groups = 0; + options->num_deny_groups = 0; + options->ciphers = NULL; + options->macs = NULL; + options->kex_algorithms = NULL; + options->ca_sign_algorithms = NULL; + options->fwd_opts.gateway_ports = -1; + options->fwd_opts.streamlocal_bind_mask = (mode_t)-1; + options->fwd_opts.streamlocal_bind_unlink = -1; + options->num_subsystems = 0; + options->max_startups_begin = -1; + options->max_startups_rate = -1; + options->max_startups = -1; + options->max_authtries = -1; + options->max_sessions = -1; + options->banner = NULL; + options->use_dns = -1; + options->client_alive_interval = -1; + options->client_alive_count_max = -1; + options->num_authkeys_files = 0; + options->num_accept_env = 0; + options->num_setenv = 0; + options->permit_tun = -1; + options->permitted_opens = NULL; + options->permitted_listens = NULL; + options->adm_forced_command = NULL; + options->chroot_directory = NULL; + options->authorized_keys_command = NULL; + options->authorized_keys_command_user = NULL; + options->revoked_keys_file = NULL; + options->trusted_user_ca_keys = NULL; + options->authorized_principals_file = NULL; + options->authorized_principals_command = NULL; + options->authorized_principals_command_user = NULL; + options->ip_qos_interactive = -1; + options->ip_qos_bulk = -1; + options->version_addendum = NULL; + options->fingerprint_hash = -1; + options->disable_forwarding = -1; + options->expose_userauth_info = -1; +} + +/* Returns 1 if a string option is unset or set to "none" or 0 otherwise. */ +static int +option_clear_or_none(const char *o) +{ + return o == NULL || strcasecmp(o, "none") == 0; +} + +static void +assemble_algorithms(ServerOptions *o) +{ + char *all_cipher, *all_mac, *all_kex, *all_key, *all_sig; + int r; + + all_cipher = cipher_alg_list(',', 0); + all_mac = mac_alg_list(','); + all_kex = kex_alg_list(','); + all_key = sshkey_alg_list(0, 0, 1, ','); + all_sig = sshkey_alg_list(0, 1, 1, ','); +#define ASSEMBLE(what, defaults, all) \ + do { \ + if ((r = kex_assemble_names(&o->what, defaults, all)) != 0) \ + fatal("%s: %s: %s", __func__, #what, ssh_err(r)); \ + } while (0) + ASSEMBLE(ciphers, KEX_SERVER_ENCRYPT, all_cipher); + ASSEMBLE(macs, KEX_SERVER_MAC, all_mac); + ASSEMBLE(kex_algorithms, KEX_SERVER_KEX, all_kex); + ASSEMBLE(hostkeyalgorithms, KEX_DEFAULT_PK_ALG, all_key); + ASSEMBLE(hostbased_key_types, KEX_DEFAULT_PK_ALG, all_key); + ASSEMBLE(pubkey_key_types, KEX_DEFAULT_PK_ALG, all_key); + ASSEMBLE(ca_sign_algorithms, SSH_ALLOWED_CA_SIGALGS, all_sig); +#undef ASSEMBLE + free(all_cipher); + free(all_mac); + free(all_kex); + free(all_key); + free(all_sig); +} + +static void +array_append(const char *file, const int line, const char *directive, + char ***array, u_int *lp, const char *s) +{ + + if (*lp >= INT_MAX) + fatal("%s line %d: Too many %s entries", file, line, directive); + + *array = xrecallocarray(*array, *lp, *lp + 1, sizeof(**array)); + (*array)[*lp] = xstrdup(s); + (*lp)++; +} + +void +servconf_add_hostkey(const char *file, const int line, + ServerOptions *options, const char *path) +{ + char *apath = derelativise_path(path); + + array_append(file, line, "HostKey", + &options->host_key_files, &options->num_host_key_files, apath); + free(apath); +} + +void +servconf_add_hostcert(const char *file, const int line, + ServerOptions *options, const char *path) +{ + char *apath = derelativise_path(path); + + array_append(file, line, "HostCertificate", + &options->host_cert_files, &options->num_host_cert_files, apath); + free(apath); +} + +void +fill_default_server_options(ServerOptions *options) +{ + u_int i; + + /* Portable-specific options */ + if (options->use_pam == -1) + options->use_pam = 0; + + /* Standard Options */ + if (options->num_host_key_files == 0) { + /* fill default hostkeys for protocols */ + servconf_add_hostkey("[default]", 0, options, + _PATH_HOST_RSA_KEY_FILE); +#ifdef OPENSSL_HAS_ECC + servconf_add_hostkey("[default]", 0, options, + _PATH_HOST_ECDSA_KEY_FILE); +#endif + servconf_add_hostkey("[default]", 0, options, + _PATH_HOST_ED25519_KEY_FILE); +#ifdef WITH_XMSS + servconf_add_hostkey("[default]", 0, options, + _PATH_HOST_XMSS_KEY_FILE); +#endif /* WITH_XMSS */ + } + /* No certificates by default */ + if (options->num_ports == 0) + options->ports[options->num_ports++] = SSH_DEFAULT_PORT; + if (options->address_family == -1) + options->address_family = AF_UNSPEC; + if (options->listen_addrs == NULL) + add_listen_addr(options, NULL, NULL, 0); + if (options->pid_file == NULL) + options->pid_file = xstrdup(_PATH_SSH_DAEMON_PID_FILE); + if (options->login_grace_time == -1) + options->login_grace_time = 120; + if (options->permit_root_login == PERMIT_NOT_SET) + options->permit_root_login = PERMIT_NO_PASSWD; + if (options->ignore_rhosts == -1) + options->ignore_rhosts = 1; + if (options->ignore_user_known_hosts == -1) + options->ignore_user_known_hosts = 0; + if (options->print_motd == -1) + options->print_motd = 1; + if (options->print_lastlog == -1) + options->print_lastlog = 1; + if (options->x11_forwarding == -1) + options->x11_forwarding = 0; + if (options->x11_display_offset == -1) + options->x11_display_offset = 10; + if (options->x11_use_localhost == -1) + options->x11_use_localhost = 1; + if (options->xauth_location == NULL) + options->xauth_location = xstrdup(_PATH_XAUTH); + if (options->permit_tty == -1) + options->permit_tty = 1; + if (options->permit_user_rc == -1) + options->permit_user_rc = 1; + if (options->strict_modes == -1) + options->strict_modes = 1; + if (options->tcp_keep_alive == -1) + options->tcp_keep_alive = 1; + if (options->log_facility == SYSLOG_FACILITY_NOT_SET) + options->log_facility = SYSLOG_FACILITY_AUTH; + if (options->log_level == SYSLOG_LEVEL_NOT_SET) + options->log_level = SYSLOG_LEVEL_INFO; + if (options->hostbased_authentication == -1) + options->hostbased_authentication = 0; + if (options->hostbased_uses_name_from_packet_only == -1) + options->hostbased_uses_name_from_packet_only = 0; + if (options->pubkey_authentication == -1) + options->pubkey_authentication = 1; + if (options->kerberos_authentication == -1) + options->kerberos_authentication = 0; + if (options->kerberos_or_local_passwd == -1) + options->kerberos_or_local_passwd = 1; + if (options->kerberos_ticket_cleanup == -1) + options->kerberos_ticket_cleanup = 1; + if (options->kerberos_get_afs_token == -1) + options->kerberos_get_afs_token = 0; + if (options->gss_authentication == -1) + options->gss_authentication = 0; + if (options->gss_cleanup_creds == -1) + options->gss_cleanup_creds = 1; + if (options->gss_strict_acceptor == -1) + options->gss_strict_acceptor = 1; + if (options->password_authentication == -1) + options->password_authentication = 1; + if (options->kbd_interactive_authentication == -1) + options->kbd_interactive_authentication = 0; + if (options->challenge_response_authentication == -1) + options->challenge_response_authentication = 1; + if (options->permit_empty_passwd == -1) + options->permit_empty_passwd = 0; + if (options->permit_user_env == -1) { + options->permit_user_env = 0; + options->permit_user_env_whitelist = NULL; + } + if (options->compression == -1) + options->compression = COMP_DELAYED; + if (options->rekey_limit == -1) + options->rekey_limit = 0; + if (options->rekey_interval == -1) + options->rekey_interval = 0; + if (options->allow_tcp_forwarding == -1) + options->allow_tcp_forwarding = FORWARD_ALLOW; + if (options->allow_streamlocal_forwarding == -1) + options->allow_streamlocal_forwarding = FORWARD_ALLOW; + if (options->allow_agent_forwarding == -1) + options->allow_agent_forwarding = 1; + if (options->fwd_opts.gateway_ports == -1) + options->fwd_opts.gateway_ports = 0; + if (options->max_startups == -1) + options->max_startups = 100; + if (options->max_startups_rate == -1) + options->max_startups_rate = 30; /* 30% */ + if (options->max_startups_begin == -1) + options->max_startups_begin = 10; + if (options->max_authtries == -1) + options->max_authtries = DEFAULT_AUTH_FAIL_MAX; + if (options->max_sessions == -1) + options->max_sessions = DEFAULT_SESSIONS_MAX; + if (options->use_dns == -1) + options->use_dns = 0; + if (options->client_alive_interval == -1) + options->client_alive_interval = 0; + if (options->client_alive_count_max == -1) + options->client_alive_count_max = 3; + if (options->num_authkeys_files == 0) { + array_append("[default]", 0, "AuthorizedKeysFiles", + &options->authorized_keys_files, + &options->num_authkeys_files, + _PATH_SSH_USER_PERMITTED_KEYS); + array_append("[default]", 0, "AuthorizedKeysFiles", + &options->authorized_keys_files, + &options->num_authkeys_files, + _PATH_SSH_USER_PERMITTED_KEYS2); + } + if (options->permit_tun == -1) + options->permit_tun = SSH_TUNMODE_NO; + if (options->ip_qos_interactive == -1) + options->ip_qos_interactive = IPTOS_DSCP_AF21; + if (options->ip_qos_bulk == -1) + options->ip_qos_bulk = IPTOS_DSCP_CS1; + if (options->version_addendum == NULL) + options->version_addendum = xstrdup(""); + if (options->fwd_opts.streamlocal_bind_mask == (mode_t)-1) + options->fwd_opts.streamlocal_bind_mask = 0177; + if (options->fwd_opts.streamlocal_bind_unlink == -1) + options->fwd_opts.streamlocal_bind_unlink = 0; + if (options->fingerprint_hash == -1) + options->fingerprint_hash = SSH_FP_HASH_DEFAULT; + if (options->disable_forwarding == -1) + options->disable_forwarding = 0; + if (options->expose_userauth_info == -1) + options->expose_userauth_info = 0; + + assemble_algorithms(options); + + /* Turn privilege separation and sandboxing on by default */ + if (use_privsep == -1) + use_privsep = PRIVSEP_ON; + +#define CLEAR_ON_NONE(v) \ + do { \ + if (option_clear_or_none(v)) { \ + free(v); \ + v = NULL; \ + } \ + } while(0) + CLEAR_ON_NONE(options->pid_file); + CLEAR_ON_NONE(options->xauth_location); + CLEAR_ON_NONE(options->banner); + CLEAR_ON_NONE(options->trusted_user_ca_keys); + CLEAR_ON_NONE(options->revoked_keys_file); + CLEAR_ON_NONE(options->authorized_principals_file); + CLEAR_ON_NONE(options->adm_forced_command); + CLEAR_ON_NONE(options->chroot_directory); + CLEAR_ON_NONE(options->routing_domain); + for (i = 0; i < options->num_host_key_files; i++) + CLEAR_ON_NONE(options->host_key_files[i]); + for (i = 0; i < options->num_host_cert_files; i++) + CLEAR_ON_NONE(options->host_cert_files[i]); +#undef CLEAR_ON_NONE + + /* Similar handling for AuthenticationMethods=any */ + if (options->num_auth_methods == 1 && + strcmp(options->auth_methods[0], "any") == 0) { + free(options->auth_methods[0]); + options->auth_methods[0] = NULL; + options->num_auth_methods = 0; + } + +#ifndef HAVE_MMAP + if (use_privsep && options->compression == 1) { + error("This platform does not support both privilege " + "separation and compression"); + error("Compression disabled"); + options->compression = 0; + } +#endif + +} + +/* Keyword tokens. */ +typedef enum { + sBadOption, /* == unknown option */ + /* Portable-specific options */ + sUsePAM, + /* Standard Options */ + sPort, sHostKeyFile, sLoginGraceTime, + sPermitRootLogin, sLogFacility, sLogLevel, + sRhostsRSAAuthentication, sRSAAuthentication, + sKerberosAuthentication, sKerberosOrLocalPasswd, sKerberosTicketCleanup, + sKerberosGetAFSToken, sChallengeResponseAuthentication, + sPasswordAuthentication, sKbdInteractiveAuthentication, + sListenAddress, sAddressFamily, + sPrintMotd, sPrintLastLog, sIgnoreRhosts, + sX11Forwarding, sX11DisplayOffset, sX11UseLocalhost, + sPermitTTY, sStrictModes, sEmptyPasswd, sTCPKeepAlive, + sPermitUserEnvironment, sAllowTcpForwarding, sCompression, + sRekeyLimit, sAllowUsers, sDenyUsers, sAllowGroups, sDenyGroups, + sIgnoreUserKnownHosts, sCiphers, sMacs, sPidFile, + sGatewayPorts, sPubkeyAuthentication, sPubkeyAcceptedKeyTypes, + sXAuthLocation, sSubsystem, sMaxStartups, sMaxAuthTries, sMaxSessions, + sBanner, sUseDNS, sHostbasedAuthentication, + sHostbasedUsesNameFromPacketOnly, sHostbasedAcceptedKeyTypes, + sHostKeyAlgorithms, + sClientAliveInterval, sClientAliveCountMax, sAuthorizedKeysFile, + sGssAuthentication, sGssCleanupCreds, sGssStrictAcceptor, + sAcceptEnv, sSetEnv, sPermitTunnel, + sMatch, sPermitOpen, sPermitListen, sForceCommand, sChrootDirectory, + sUsePrivilegeSeparation, sAllowAgentForwarding, + sHostCertificate, + sRevokedKeys, sTrustedUserCAKeys, sAuthorizedPrincipalsFile, + sAuthorizedPrincipalsCommand, sAuthorizedPrincipalsCommandUser, + sKexAlgorithms, sCASignatureAlgorithms, sIPQoS, sVersionAddendum, + sAuthorizedKeysCommand, sAuthorizedKeysCommandUser, + sAuthenticationMethods, sHostKeyAgent, sPermitUserRC, + sStreamLocalBindMask, sStreamLocalBindUnlink, + sAllowStreamLocalForwarding, sFingerprintHash, sDisableForwarding, + sExposeAuthInfo, sRDomain, + sDeprecated, sIgnore, sUnsupported +} ServerOpCodes; + +#define SSHCFG_GLOBAL 0x01 /* allowed in main section of sshd_config */ +#define SSHCFG_MATCH 0x02 /* allowed inside a Match section */ +#define SSHCFG_ALL (SSHCFG_GLOBAL|SSHCFG_MATCH) + +/* Textual representation of the tokens. */ +static struct { + const char *name; + ServerOpCodes opcode; + u_int flags; +} keywords[] = { + /* Portable-specific options */ +#ifdef USE_PAM + { "usepam", sUsePAM, SSHCFG_GLOBAL }, +#else + { "usepam", sUnsupported, SSHCFG_GLOBAL }, +#endif + { "pamauthenticationviakbdint", sDeprecated, SSHCFG_GLOBAL }, + /* Standard Options */ + { "port", sPort, SSHCFG_GLOBAL }, + { "hostkey", sHostKeyFile, SSHCFG_GLOBAL }, + { "hostdsakey", sHostKeyFile, SSHCFG_GLOBAL }, /* alias */ + { "hostkeyagent", sHostKeyAgent, SSHCFG_GLOBAL }, + { "pidfile", sPidFile, SSHCFG_GLOBAL }, + { "serverkeybits", sDeprecated, SSHCFG_GLOBAL }, + { "logingracetime", sLoginGraceTime, SSHCFG_GLOBAL }, + { "keyregenerationinterval", sDeprecated, SSHCFG_GLOBAL }, + { "permitrootlogin", sPermitRootLogin, SSHCFG_ALL }, + { "syslogfacility", sLogFacility, SSHCFG_GLOBAL }, + { "loglevel", sLogLevel, SSHCFG_ALL }, + { "rhostsauthentication", sDeprecated, SSHCFG_GLOBAL }, + { "rhostsrsaauthentication", sDeprecated, SSHCFG_ALL }, + { "hostbasedauthentication", sHostbasedAuthentication, SSHCFG_ALL }, + { "hostbasedusesnamefrompacketonly", sHostbasedUsesNameFromPacketOnly, SSHCFG_ALL }, + { "hostbasedacceptedkeytypes", sHostbasedAcceptedKeyTypes, SSHCFG_ALL }, + { "hostkeyalgorithms", sHostKeyAlgorithms, SSHCFG_GLOBAL }, + { "rsaauthentication", sDeprecated, SSHCFG_ALL }, + { "pubkeyauthentication", sPubkeyAuthentication, SSHCFG_ALL }, + { "pubkeyacceptedkeytypes", sPubkeyAcceptedKeyTypes, SSHCFG_ALL }, + { "dsaauthentication", sPubkeyAuthentication, SSHCFG_GLOBAL }, /* alias */ +#ifdef KRB5 + { "kerberosauthentication", sKerberosAuthentication, SSHCFG_ALL }, + { "kerberosorlocalpasswd", sKerberosOrLocalPasswd, SSHCFG_GLOBAL }, + { "kerberosticketcleanup", sKerberosTicketCleanup, SSHCFG_GLOBAL }, +#ifdef USE_AFS + { "kerberosgetafstoken", sKerberosGetAFSToken, SSHCFG_GLOBAL }, +#else + { "kerberosgetafstoken", sUnsupported, SSHCFG_GLOBAL }, +#endif +#else + { "kerberosauthentication", sUnsupported, SSHCFG_ALL }, + { "kerberosorlocalpasswd", sUnsupported, SSHCFG_GLOBAL }, + { "kerberosticketcleanup", sUnsupported, SSHCFG_GLOBAL }, + { "kerberosgetafstoken", sUnsupported, SSHCFG_GLOBAL }, +#endif + { "kerberostgtpassing", sUnsupported, SSHCFG_GLOBAL }, + { "afstokenpassing", sUnsupported, SSHCFG_GLOBAL }, +#ifdef GSSAPI + { "gssapiauthentication", sGssAuthentication, SSHCFG_ALL }, + { "gssapicleanupcredentials", sGssCleanupCreds, SSHCFG_GLOBAL }, + { "gssapistrictacceptorcheck", sGssStrictAcceptor, SSHCFG_GLOBAL }, +#else + { "gssapiauthentication", sUnsupported, SSHCFG_ALL }, + { "gssapicleanupcredentials", sUnsupported, SSHCFG_GLOBAL }, + { "gssapistrictacceptorcheck", sUnsupported, SSHCFG_GLOBAL }, +#endif + { "passwordauthentication", sPasswordAuthentication, SSHCFG_ALL }, + { "kbdinteractiveauthentication", sKbdInteractiveAuthentication, SSHCFG_ALL }, + { "challengeresponseauthentication", sChallengeResponseAuthentication, SSHCFG_GLOBAL }, + { "skeyauthentication", sDeprecated, SSHCFG_GLOBAL }, + { "checkmail", sDeprecated, SSHCFG_GLOBAL }, + { "listenaddress", sListenAddress, SSHCFG_GLOBAL }, + { "addressfamily", sAddressFamily, SSHCFG_GLOBAL }, + { "printmotd", sPrintMotd, SSHCFG_GLOBAL }, +#ifdef DISABLE_LASTLOG + { "printlastlog", sUnsupported, SSHCFG_GLOBAL }, +#else + { "printlastlog", sPrintLastLog, SSHCFG_GLOBAL }, +#endif + { "ignorerhosts", sIgnoreRhosts, SSHCFG_GLOBAL }, + { "ignoreuserknownhosts", sIgnoreUserKnownHosts, SSHCFG_GLOBAL }, + { "x11forwarding", sX11Forwarding, SSHCFG_ALL }, + { "x11displayoffset", sX11DisplayOffset, SSHCFG_ALL }, + { "x11uselocalhost", sX11UseLocalhost, SSHCFG_ALL }, + { "xauthlocation", sXAuthLocation, SSHCFG_GLOBAL }, + { "strictmodes", sStrictModes, SSHCFG_GLOBAL }, + { "permitemptypasswords", sEmptyPasswd, SSHCFG_ALL }, + { "permituserenvironment", sPermitUserEnvironment, SSHCFG_GLOBAL }, + { "uselogin", sDeprecated, SSHCFG_GLOBAL }, + { "compression", sCompression, SSHCFG_GLOBAL }, + { "rekeylimit", sRekeyLimit, SSHCFG_ALL }, + { "tcpkeepalive", sTCPKeepAlive, SSHCFG_GLOBAL }, + { "keepalive", sTCPKeepAlive, SSHCFG_GLOBAL }, /* obsolete alias */ + { "allowtcpforwarding", sAllowTcpForwarding, SSHCFG_ALL }, + { "allowagentforwarding", sAllowAgentForwarding, SSHCFG_ALL }, + { "allowusers", sAllowUsers, SSHCFG_ALL }, + { "denyusers", sDenyUsers, SSHCFG_ALL }, + { "allowgroups", sAllowGroups, SSHCFG_ALL }, + { "denygroups", sDenyGroups, SSHCFG_ALL }, + { "ciphers", sCiphers, SSHCFG_GLOBAL }, + { "macs", sMacs, SSHCFG_GLOBAL }, + { "protocol", sIgnore, SSHCFG_GLOBAL }, + { "gatewayports", sGatewayPorts, SSHCFG_ALL }, + { "subsystem", sSubsystem, SSHCFG_GLOBAL }, + { "maxstartups", sMaxStartups, SSHCFG_GLOBAL }, + { "maxauthtries", sMaxAuthTries, SSHCFG_ALL }, + { "maxsessions", sMaxSessions, SSHCFG_ALL }, + { "banner", sBanner, SSHCFG_ALL }, + { "usedns", sUseDNS, SSHCFG_GLOBAL }, + { "verifyreversemapping", sDeprecated, SSHCFG_GLOBAL }, + { "reversemappingcheck", sDeprecated, SSHCFG_GLOBAL }, + { "clientaliveinterval", sClientAliveInterval, SSHCFG_ALL }, + { "clientalivecountmax", sClientAliveCountMax, SSHCFG_ALL }, + { "authorizedkeysfile", sAuthorizedKeysFile, SSHCFG_ALL }, + { "authorizedkeysfile2", sDeprecated, SSHCFG_ALL }, + { "useprivilegeseparation", sDeprecated, SSHCFG_GLOBAL}, + { "acceptenv", sAcceptEnv, SSHCFG_ALL }, + { "setenv", sSetEnv, SSHCFG_ALL }, + { "permittunnel", sPermitTunnel, SSHCFG_ALL }, + { "permittty", sPermitTTY, SSHCFG_ALL }, + { "permituserrc", sPermitUserRC, SSHCFG_ALL }, + { "match", sMatch, SSHCFG_ALL }, + { "permitopen", sPermitOpen, SSHCFG_ALL }, + { "permitlisten", sPermitListen, SSHCFG_ALL }, + { "forcecommand", sForceCommand, SSHCFG_ALL }, + { "chrootdirectory", sChrootDirectory, SSHCFG_ALL }, + { "hostcertificate", sHostCertificate, SSHCFG_GLOBAL }, + { "revokedkeys", sRevokedKeys, SSHCFG_ALL }, + { "trustedusercakeys", sTrustedUserCAKeys, SSHCFG_ALL }, + { "authorizedprincipalsfile", sAuthorizedPrincipalsFile, SSHCFG_ALL }, + { "kexalgorithms", sKexAlgorithms, SSHCFG_GLOBAL }, + { "ipqos", sIPQoS, SSHCFG_ALL }, + { "authorizedkeyscommand", sAuthorizedKeysCommand, SSHCFG_ALL }, + { "authorizedkeyscommanduser", sAuthorizedKeysCommandUser, SSHCFG_ALL }, + { "authorizedprincipalscommand", sAuthorizedPrincipalsCommand, SSHCFG_ALL }, + { "authorizedprincipalscommanduser", sAuthorizedPrincipalsCommandUser, SSHCFG_ALL }, + { "versionaddendum", sVersionAddendum, SSHCFG_GLOBAL }, + { "authenticationmethods", sAuthenticationMethods, SSHCFG_ALL }, + { "streamlocalbindmask", sStreamLocalBindMask, SSHCFG_ALL }, + { "streamlocalbindunlink", sStreamLocalBindUnlink, SSHCFG_ALL }, + { "allowstreamlocalforwarding", sAllowStreamLocalForwarding, SSHCFG_ALL }, + { "fingerprinthash", sFingerprintHash, SSHCFG_GLOBAL }, + { "disableforwarding", sDisableForwarding, SSHCFG_ALL }, + { "exposeauthinfo", sExposeAuthInfo, SSHCFG_ALL }, + { "rdomain", sRDomain, SSHCFG_ALL }, + { "casignaturealgorithms", sCASignatureAlgorithms, SSHCFG_ALL }, + { NULL, sBadOption, 0 } +}; + +static struct { + int val; + char *text; +} tunmode_desc[] = { + { SSH_TUNMODE_NO, "no" }, + { SSH_TUNMODE_POINTOPOINT, "point-to-point" }, + { SSH_TUNMODE_ETHERNET, "ethernet" }, + { SSH_TUNMODE_YES, "yes" }, + { -1, NULL } +}; + +/* Returns an opcode name from its number */ + +static const char * +lookup_opcode_name(ServerOpCodes code) +{ + u_int i; + + for (i = 0; keywords[i].name != NULL; i++) + if (keywords[i].opcode == code) + return(keywords[i].name); + return "UNKNOWN"; +} + + +/* + * Returns the number of the token pointed to by cp or sBadOption. + */ + +static ServerOpCodes +parse_token(const char *cp, const char *filename, + int linenum, u_int *flags) +{ + u_int i; + + for (i = 0; keywords[i].name; i++) + if (strcasecmp(cp, keywords[i].name) == 0) { + *flags = keywords[i].flags; + return keywords[i].opcode; + } + + error("%s: line %d: Bad configuration option: %s", + filename, linenum, cp); + return sBadOption; +} + +char * +derelativise_path(const char *path) +{ + char *expanded, *ret, cwd[PATH_MAX]; + + if (strcasecmp(path, "none") == 0) + return xstrdup("none"); + expanded = tilde_expand_filename(path, getuid()); + if (*expanded == '/') + return expanded; + if (getcwd(cwd, sizeof(cwd)) == NULL) + fatal("%s: getcwd: %s", __func__, strerror(errno)); + xasprintf(&ret, "%s/%s", cwd, expanded); + free(expanded); + return ret; +} + +static void +add_listen_addr(ServerOptions *options, const char *addr, + const char *rdomain, int port) +{ + u_int i; + + if (port > 0) + add_one_listen_addr(options, addr, rdomain, port); + else { + for (i = 0; i < options->num_ports; i++) { + add_one_listen_addr(options, addr, rdomain, + options->ports[i]); + } + } +} + +static void +add_one_listen_addr(ServerOptions *options, const char *addr, + const char *rdomain, int port) +{ + struct addrinfo hints, *ai, *aitop; + char strport[NI_MAXSERV]; + int gaierr; + u_int i; + + /* Find listen_addrs entry for this rdomain */ + for (i = 0; i < options->num_listen_addrs; i++) { + if (rdomain == NULL && options->listen_addrs[i].rdomain == NULL) + break; + if (rdomain == NULL || options->listen_addrs[i].rdomain == NULL) + continue; + if (strcmp(rdomain, options->listen_addrs[i].rdomain) == 0) + break; + } + if (i >= options->num_listen_addrs) { + /* No entry for this rdomain; allocate one */ + if (i >= INT_MAX) + fatal("%s: too many listen addresses", __func__); + options->listen_addrs = xrecallocarray(options->listen_addrs, + options->num_listen_addrs, options->num_listen_addrs + 1, + sizeof(*options->listen_addrs)); + i = options->num_listen_addrs++; + if (rdomain != NULL) + options->listen_addrs[i].rdomain = xstrdup(rdomain); + } + /* options->listen_addrs[i] points to the addresses for this rdomain */ + + memset(&hints, 0, sizeof(hints)); + hints.ai_family = options->address_family; + hints.ai_socktype = SOCK_STREAM; + hints.ai_flags = (addr == NULL) ? AI_PASSIVE : 0; + snprintf(strport, sizeof strport, "%d", port); + if ((gaierr = getaddrinfo(addr, strport, &hints, &aitop)) != 0) + fatal("bad addr or host: %s (%s)", + addr ? addr : "<NULL>", + ssh_gai_strerror(gaierr)); + for (ai = aitop; ai->ai_next; ai = ai->ai_next) + ; + ai->ai_next = options->listen_addrs[i].addrs; + options->listen_addrs[i].addrs = aitop; +} + +/* Returns nonzero if the routing domain name is valid */ +static int +valid_rdomain(const char *name) +{ +#if defined(HAVE_SYS_VALID_RDOMAIN) + return sys_valid_rdomain(name); +#elif defined(__OpenBSD__) + const char *errstr; + long long num; + struct rt_tableinfo info; + int mib[6]; + size_t miblen = sizeof(mib); + + if (name == NULL) + return 1; + + num = strtonum(name, 0, 255, &errstr); + if (errstr != NULL) + return 0; + + /* Check whether the table actually exists */ + memset(mib, 0, sizeof(mib)); + mib[0] = CTL_NET; + mib[1] = PF_ROUTE; + mib[4] = NET_RT_TABLE; + mib[5] = (int)num; + if (sysctl(mib, 6, &info, &miblen, NULL, 0) == -1) + return 0; + + return 1; +#else /* defined(__OpenBSD__) */ + error("Routing domains are not supported on this platform"); + return 0; +#endif +} + +/* + * Queue a ListenAddress to be processed once we have all of the Ports + * and AddressFamily options. + */ +static void +queue_listen_addr(ServerOptions *options, const char *addr, + const char *rdomain, int port) +{ + struct queued_listenaddr *qla; + + options->queued_listen_addrs = xrecallocarray( + options->queued_listen_addrs, + options->num_queued_listens, options->num_queued_listens + 1, + sizeof(*options->queued_listen_addrs)); + qla = &options->queued_listen_addrs[options->num_queued_listens++]; + qla->addr = xstrdup(addr); + qla->port = port; + qla->rdomain = rdomain == NULL ? NULL : xstrdup(rdomain); +} + +/* + * Process queued (text) ListenAddress entries. + */ +static void +process_queued_listen_addrs(ServerOptions *options) +{ + u_int i; + struct queued_listenaddr *qla; + + if (options->num_ports == 0) + options->ports[options->num_ports++] = SSH_DEFAULT_PORT; + if (options->address_family == -1) + options->address_family = AF_UNSPEC; + + for (i = 0; i < options->num_queued_listens; i++) { + qla = &options->queued_listen_addrs[i]; + add_listen_addr(options, qla->addr, qla->rdomain, qla->port); + free(qla->addr); + free(qla->rdomain); + } + free(options->queued_listen_addrs); + options->queued_listen_addrs = NULL; + options->num_queued_listens = 0; +} + +/* + * Inform channels layer of permitopen options for a single forwarding + * direction (local/remote). + */ +static void +process_permitopen_list(struct ssh *ssh, ServerOpCodes opcode, + char **opens, u_int num_opens) +{ + u_int i; + int port; + char *host, *arg, *oarg; + int where = opcode == sPermitOpen ? FORWARD_LOCAL : FORWARD_REMOTE; + const char *what = lookup_opcode_name(opcode); + + channel_clear_permission(ssh, FORWARD_ADM, where); + if (num_opens == 0) + return; /* permit any */ + + /* handle keywords: "any" / "none" */ + if (num_opens == 1 && strcmp(opens[0], "any") == 0) + return; + if (num_opens == 1 && strcmp(opens[0], "none") == 0) { + channel_disable_admin(ssh, where); + return; + } + /* Otherwise treat it as a list of permitted host:port */ + for (i = 0; i < num_opens; i++) { + oarg = arg = xstrdup(opens[i]); + host = hpdelim(&arg); + if (host == NULL) + fatal("%s: missing host in %s", __func__, what); + host = cleanhostname(host); + if (arg == NULL || ((port = permitopen_port(arg)) < 0)) + fatal("%s: bad port number in %s", __func__, what); + /* Send it to channels layer */ + channel_add_permission(ssh, FORWARD_ADM, + where, host, port); + free(oarg); + } +} + +/* + * Inform channels layer of permitopen options from configuration. + */ +void +process_permitopen(struct ssh *ssh, ServerOptions *options) +{ + process_permitopen_list(ssh, sPermitOpen, + options->permitted_opens, options->num_permitted_opens); + process_permitopen_list(ssh, sPermitListen, + options->permitted_listens, + options->num_permitted_listens); +} + +struct connection_info * +get_connection_info(int populate, int use_dns) +{ + struct ssh *ssh = active_state; /* XXX */ + static struct connection_info ci; + + if (!populate) + return &ci; + ci.host = auth_get_canonical_hostname(ssh, use_dns); + ci.address = ssh_remote_ipaddr(ssh); + ci.laddress = ssh_local_ipaddr(ssh); + ci.lport = ssh_local_port(ssh); + ci.rdomain = ssh_packet_rdomain_in(ssh); + return &ci; +} + +/* + * The strategy for the Match blocks is that the config file is parsed twice. + * + * The first time is at startup. activep is initialized to 1 and the + * directives in the global context are processed and acted on. Hitting a + * Match directive unsets activep and the directives inside the block are + * checked for syntax only. + * + * The second time is after a connection has been established but before + * authentication. activep is initialized to 2 and global config directives + * are ignored since they have already been processed. If the criteria in a + * Match block is met, activep is set and the subsequent directives + * processed and actioned until EOF or another Match block unsets it. Any + * options set are copied into the main server config. + * + * Potential additions/improvements: + * - Add Match support for pre-kex directives, eg. Ciphers. + * + * - Add a Tag directive (idea from David Leonard) ala pf, eg: + * Match Address 192.168.0.* + * Tag trusted + * Match Group wheel + * Tag trusted + * Match Tag trusted + * AllowTcpForwarding yes + * GatewayPorts clientspecified + * [...] + * + * - Add a PermittedChannelRequests directive + * Match Group shell + * PermittedChannelRequests session,forwarded-tcpip + */ + +static int +match_cfg_line_group(const char *grps, int line, const char *user) +{ + int result = 0; + struct passwd *pw; + + if (user == NULL) + goto out; + + if ((pw = getpwnam(user)) == NULL) { + debug("Can't match group at line %d because user %.100s does " + "not exist", line, user); + } else if (ga_init(pw->pw_name, pw->pw_gid) == 0) { + debug("Can't Match group because user %.100s not in any group " + "at line %d", user, line); + } else if (ga_match_pattern_list(grps) != 1) { + debug("user %.100s does not match group list %.100s at line %d", + user, grps, line); + } else { + debug("user %.100s matched group list %.100s at line %d", user, + grps, line); + result = 1; + } +out: + ga_free(); + return result; +} + +static void +match_test_missing_fatal(const char *criteria, const char *attrib) +{ + fatal("'Match %s' in configuration but '%s' not in connection " + "test specification.", criteria, attrib); +} + +/* + * All of the attributes on a single Match line are ANDed together, so we need + * to check every attribute and set the result to zero if any attribute does + * not match. + */ +static int +match_cfg_line(char **condition, int line, struct connection_info *ci) +{ + int result = 1, attributes = 0, port; + char *arg, *attrib, *cp = *condition; + + if (ci == NULL) + debug3("checking syntax for 'Match %s'", cp); + else + debug3("checking match for '%s' user %s host %s addr %s " + "laddr %s lport %d", cp, ci->user ? ci->user : "(null)", + ci->host ? ci->host : "(null)", + ci->address ? ci->address : "(null)", + ci->laddress ? ci->laddress : "(null)", ci->lport); + + while ((attrib = strdelim(&cp)) && *attrib != '\0') { + attributes++; + if (strcasecmp(attrib, "all") == 0) { + if (attributes != 1 || + ((arg = strdelim(&cp)) != NULL && *arg != '\0')) { + error("'all' cannot be combined with other " + "Match attributes"); + return -1; + } + *condition = cp; + return 1; + } + if ((arg = strdelim(&cp)) == NULL || *arg == '\0') { + error("Missing Match criteria for %s", attrib); + return -1; + } + if (strcasecmp(attrib, "user") == 0) { + if (ci == NULL) { + result = 0; + continue; + } + if (ci->user == NULL) + match_test_missing_fatal("User", "user"); + if (match_pattern_list(ci->user, arg, 0) != 1) + result = 0; + else + debug("user %.100s matched 'User %.100s' at " + "line %d", ci->user, arg, line); + } else if (strcasecmp(attrib, "group") == 0) { + if (ci == NULL) { + result = 0; + continue; + } + if (ci->user == NULL) + match_test_missing_fatal("Group", "user"); + switch (match_cfg_line_group(arg, line, ci->user)) { + case -1: + return -1; + case 0: + result = 0; + } + } else if (strcasecmp(attrib, "host") == 0) { + if (ci == NULL) { + result = 0; + continue; + } + if (ci->host == NULL) + match_test_missing_fatal("Host", "host"); + if (match_hostname(ci->host, arg) != 1) + result = 0; + else + debug("connection from %.100s matched 'Host " + "%.100s' at line %d", ci->host, arg, line); + } else if (strcasecmp(attrib, "address") == 0) { + if (ci == NULL) { + result = 0; + continue; + } + if (ci->address == NULL) + match_test_missing_fatal("Address", "addr"); + switch (addr_match_list(ci->address, arg)) { + case 1: + debug("connection from %.100s matched 'Address " + "%.100s' at line %d", ci->address, arg, line); + break; + case 0: + case -1: + result = 0; + break; + case -2: + return -1; + } + } else if (strcasecmp(attrib, "localaddress") == 0){ + if (ci == NULL) { + result = 0; + continue; + } + if (ci->laddress == NULL) + match_test_missing_fatal("LocalAddress", + "laddr"); + switch (addr_match_list(ci->laddress, arg)) { + case 1: + debug("connection from %.100s matched " + "'LocalAddress %.100s' at line %d", + ci->laddress, arg, line); + break; + case 0: + case -1: + result = 0; + break; + case -2: + return -1; + } + } else if (strcasecmp(attrib, "localport") == 0) { + if ((port = a2port(arg)) == -1) { + error("Invalid LocalPort '%s' on Match line", + arg); + return -1; + } + if (ci == NULL) { + result = 0; + continue; + } + if (ci->lport == 0) + match_test_missing_fatal("LocalPort", "lport"); + /* TODO support port lists */ + if (port == ci->lport) + debug("connection from %.100s matched " + "'LocalPort %d' at line %d", + ci->laddress, port, line); + else + result = 0; + } else if (strcasecmp(attrib, "rdomain") == 0) { + if (ci == NULL || ci->rdomain == NULL) { + result = 0; + continue; + } + if (match_pattern_list(ci->rdomain, arg, 0) != 1) + result = 0; + else + debug("user %.100s matched 'RDomain %.100s' at " + "line %d", ci->rdomain, arg, line); + } else { + error("Unsupported Match attribute %s", attrib); + return -1; + } + } + if (attributes == 0) { + error("One or more attributes required for Match"); + return -1; + } + if (ci != NULL) + debug3("match %sfound", result ? "" : "not "); + *condition = cp; + return result; +} + +#define WHITESPACE " \t\r\n" + +/* Multistate option parsing */ +struct multistate { + char *key; + int value; +}; +static const struct multistate multistate_flag[] = { + { "yes", 1 }, + { "no", 0 }, + { NULL, -1 } +}; +static const struct multistate multistate_addressfamily[] = { + { "inet", AF_INET }, + { "inet6", AF_INET6 }, + { "any", AF_UNSPEC }, + { NULL, -1 } +}; +static const struct multistate multistate_permitrootlogin[] = { + { "without-password", PERMIT_NO_PASSWD }, + { "prohibit-password", PERMIT_NO_PASSWD }, + { "forced-commands-only", PERMIT_FORCED_ONLY }, + { "yes", PERMIT_YES }, + { "no", PERMIT_NO }, + { NULL, -1 } +}; +static const struct multistate multistate_compression[] = { + { "yes", COMP_DELAYED }, + { "delayed", COMP_DELAYED }, + { "no", COMP_NONE }, + { NULL, -1 } +}; +static const struct multistate multistate_gatewayports[] = { + { "clientspecified", 2 }, + { "yes", 1 }, + { "no", 0 }, + { NULL, -1 } +}; +static const struct multistate multistate_tcpfwd[] = { + { "yes", FORWARD_ALLOW }, + { "all", FORWARD_ALLOW }, + { "no", FORWARD_DENY }, + { "remote", FORWARD_REMOTE }, + { "local", FORWARD_LOCAL }, + { NULL, -1 } +}; + +int +process_server_config_line(ServerOptions *options, char *line, + const char *filename, int linenum, int *activep, + struct connection_info *connectinfo) +{ + char *cp, ***chararrayptr, **charptr, *arg, *arg2, *p; + int cmdline = 0, *intptr, value, value2, n, port; + SyslogFacility *log_facility_ptr; + LogLevel *log_level_ptr; + ServerOpCodes opcode; + u_int i, *uintptr, uvalue, flags = 0; + size_t len; + long long val64; + const struct multistate *multistate_ptr; + const char *errstr; + + /* Strip trailing whitespace. Allow \f (form feed) at EOL only */ + if ((len = strlen(line)) == 0) + return 0; + for (len--; len > 0; len--) { + if (strchr(WHITESPACE "\f", line[len]) == NULL) + break; + line[len] = '\0'; + } + + cp = line; + if ((arg = strdelim(&cp)) == NULL) + return 0; + /* Ignore leading whitespace */ + if (*arg == '\0') + arg = strdelim(&cp); + if (!arg || !*arg || *arg == '#') + return 0; + intptr = NULL; + charptr = NULL; + opcode = parse_token(arg, filename, linenum, &flags); + + if (activep == NULL) { /* We are processing a command line directive */ + cmdline = 1; + activep = &cmdline; + } + if (*activep && opcode != sMatch) + debug3("%s:%d setting %s %s", filename, linenum, arg, cp); + if (*activep == 0 && !(flags & SSHCFG_MATCH)) { + if (connectinfo == NULL) { + fatal("%s line %d: Directive '%s' is not allowed " + "within a Match block", filename, linenum, arg); + } else { /* this is a directive we have already processed */ + while (arg) + arg = strdelim(&cp); + return 0; + } + } + + switch (opcode) { + /* Portable-specific options */ + case sUsePAM: + intptr = &options->use_pam; + goto parse_flag; + + /* Standard Options */ + case sBadOption: + return -1; + case sPort: + /* ignore ports from configfile if cmdline specifies ports */ + if (options->ports_from_cmdline) + return 0; + if (options->num_ports >= MAX_PORTS) + fatal("%s line %d: too many ports.", + filename, linenum); + arg = strdelim(&cp); + if (!arg || *arg == '\0') + fatal("%s line %d: missing port number.", + filename, linenum); + options->ports[options->num_ports++] = a2port(arg); + if (options->ports[options->num_ports-1] <= 0) + fatal("%s line %d: Badly formatted port number.", + filename, linenum); + break; + + case sLoginGraceTime: + intptr = &options->login_grace_time; + parse_time: + arg = strdelim(&cp); + if (!arg || *arg == '\0') + fatal("%s line %d: missing time value.", + filename, linenum); + if ((value = convtime(arg)) == -1) + fatal("%s line %d: invalid time value.", + filename, linenum); + if (*activep && *intptr == -1) + *intptr = value; + break; + + case sListenAddress: + arg = strdelim(&cp); + if (arg == NULL || *arg == '\0') + fatal("%s line %d: missing address", + filename, linenum); + /* check for bare IPv6 address: no "[]" and 2 or more ":" */ + if (strchr(arg, '[') == NULL && (p = strchr(arg, ':')) != NULL + && strchr(p+1, ':') != NULL) { + port = 0; + p = arg; + } else { + p = hpdelim(&arg); + if (p == NULL) + fatal("%s line %d: bad address:port usage", + filename, linenum); + p = cleanhostname(p); + if (arg == NULL) + port = 0; + else if ((port = a2port(arg)) <= 0) + fatal("%s line %d: bad port number", + filename, linenum); + } + /* Optional routing table */ + arg2 = NULL; + if ((arg = strdelim(&cp)) != NULL) { + if (strcmp(arg, "rdomain") != 0 || + (arg2 = strdelim(&cp)) == NULL) + fatal("%s line %d: bad ListenAddress syntax", + filename, linenum); + if (!valid_rdomain(arg2)) + fatal("%s line %d: bad routing domain", + filename, linenum); + } + + queue_listen_addr(options, p, arg2, port); + + break; + + case sAddressFamily: + intptr = &options->address_family; + multistate_ptr = multistate_addressfamily; + parse_multistate: + arg = strdelim(&cp); + if (!arg || *arg == '\0') + fatal("%s line %d: missing argument.", + filename, linenum); + value = -1; + for (i = 0; multistate_ptr[i].key != NULL; i++) { + if (strcasecmp(arg, multistate_ptr[i].key) == 0) { + value = multistate_ptr[i].value; + break; + } + } + if (value == -1) + fatal("%s line %d: unsupported option \"%s\".", + filename, linenum, arg); + if (*activep && *intptr == -1) + *intptr = value; + break; + + case sHostKeyFile: + arg = strdelim(&cp); + if (!arg || *arg == '\0') + fatal("%s line %d: missing file name.", + filename, linenum); + if (*activep) + servconf_add_hostkey(filename, linenum, options, arg); + break; + + case sHostKeyAgent: + charptr = &options->host_key_agent; + arg = strdelim(&cp); + if (!arg || *arg == '\0') + fatal("%s line %d: missing socket name.", + filename, linenum); + if (*activep && *charptr == NULL) + *charptr = !strcmp(arg, SSH_AUTHSOCKET_ENV_NAME) ? + xstrdup(arg) : derelativise_path(arg); + break; + + case sHostCertificate: + arg = strdelim(&cp); + if (!arg || *arg == '\0') + fatal("%s line %d: missing file name.", + filename, linenum); + if (*activep) + servconf_add_hostcert(filename, linenum, options, arg); + break; + + case sPidFile: + charptr = &options->pid_file; + parse_filename: + arg = strdelim(&cp); + if (!arg || *arg == '\0') + fatal("%s line %d: missing file name.", + filename, linenum); + if (*activep && *charptr == NULL) { + *charptr = derelativise_path(arg); + /* increase optional counter */ + if (intptr != NULL) + *intptr = *intptr + 1; + } + break; + + case sPermitRootLogin: + intptr = &options->permit_root_login; + multistate_ptr = multistate_permitrootlogin; + goto parse_multistate; + + case sIgnoreRhosts: + intptr = &options->ignore_rhosts; + parse_flag: + multistate_ptr = multistate_flag; + goto parse_multistate; + + case sIgnoreUserKnownHosts: + intptr = &options->ignore_user_known_hosts; + goto parse_flag; + + case sHostbasedAuthentication: + intptr = &options->hostbased_authentication; + goto parse_flag; + + case sHostbasedUsesNameFromPacketOnly: + intptr = &options->hostbased_uses_name_from_packet_only; + goto parse_flag; + + case sHostbasedAcceptedKeyTypes: + charptr = &options->hostbased_key_types; + parse_keytypes: + arg = strdelim(&cp); + if (!arg || *arg == '\0') + fatal("%s line %d: Missing argument.", + filename, linenum); + if (*arg != '-' && + !sshkey_names_valid2(*arg == '+' ? arg + 1 : arg, 1)) + fatal("%s line %d: Bad key types '%s'.", + filename, linenum, arg ? arg : "<NONE>"); + if (*activep && *charptr == NULL) + *charptr = xstrdup(arg); + break; + + case sHostKeyAlgorithms: + charptr = &options->hostkeyalgorithms; + goto parse_keytypes; + + case sCASignatureAlgorithms: + charptr = &options->ca_sign_algorithms; + goto parse_keytypes; + + case sPubkeyAuthentication: + intptr = &options->pubkey_authentication; + goto parse_flag; + + case sPubkeyAcceptedKeyTypes: + charptr = &options->pubkey_key_types; + goto parse_keytypes; + + case sKerberosAuthentication: + intptr = &options->kerberos_authentication; + goto parse_flag; + + case sKerberosOrLocalPasswd: + intptr = &options->kerberos_or_local_passwd; + goto parse_flag; + + case sKerberosTicketCleanup: + intptr = &options->kerberos_ticket_cleanup; + goto parse_flag; + + case sKerberosGetAFSToken: + intptr = &options->kerberos_get_afs_token; + goto parse_flag; + + case sGssAuthentication: + intptr = &options->gss_authentication; + goto parse_flag; + + case sGssCleanupCreds: + intptr = &options->gss_cleanup_creds; + goto parse_flag; + + case sGssStrictAcceptor: + intptr = &options->gss_strict_acceptor; + goto parse_flag; + + case sPasswordAuthentication: + intptr = &options->password_authentication; + goto parse_flag; + + case sKbdInteractiveAuthentication: + intptr = &options->kbd_interactive_authentication; + goto parse_flag; + + case sChallengeResponseAuthentication: + intptr = &options->challenge_response_authentication; + goto parse_flag; + + case sPrintMotd: + intptr = &options->print_motd; + goto parse_flag; + + case sPrintLastLog: + intptr = &options->print_lastlog; + goto parse_flag; + + case sX11Forwarding: + intptr = &options->x11_forwarding; + goto parse_flag; + + case sX11DisplayOffset: + intptr = &options->x11_display_offset; + parse_int: + arg = strdelim(&cp); + if ((errstr = atoi_err(arg, &value)) != NULL) + fatal("%s line %d: integer value %s.", + filename, linenum, errstr); + if (*activep && *intptr == -1) + *intptr = value; + break; + + case sX11UseLocalhost: + intptr = &options->x11_use_localhost; + goto parse_flag; + + case sXAuthLocation: + charptr = &options->xauth_location; + goto parse_filename; + + case sPermitTTY: + intptr = &options->permit_tty; + goto parse_flag; + + case sPermitUserRC: + intptr = &options->permit_user_rc; + goto parse_flag; + + case sStrictModes: + intptr = &options->strict_modes; + goto parse_flag; + + case sTCPKeepAlive: + intptr = &options->tcp_keep_alive; + goto parse_flag; + + case sEmptyPasswd: + intptr = &options->permit_empty_passwd; + goto parse_flag; + + case sPermitUserEnvironment: + intptr = &options->permit_user_env; + charptr = &options->permit_user_env_whitelist; + arg = strdelim(&cp); + if (!arg || *arg == '\0') + fatal("%s line %d: missing argument.", + filename, linenum); + value = 0; + p = NULL; + if (strcmp(arg, "yes") == 0) + value = 1; + else if (strcmp(arg, "no") == 0) + value = 0; + else { + /* Pattern-list specified */ + value = 1; + p = xstrdup(arg); + } + if (*activep && *intptr == -1) { + *intptr = value; + *charptr = p; + p = NULL; + } + free(p); + break; + + case sCompression: + intptr = &options->compression; + multistate_ptr = multistate_compression; + goto parse_multistate; + + case sRekeyLimit: + arg = strdelim(&cp); + if (!arg || *arg == '\0') + fatal("%.200s line %d: Missing argument.", filename, + linenum); + if (strcmp(arg, "default") == 0) { + val64 = 0; + } else { + if (scan_scaled(arg, &val64) == -1) + fatal("%.200s line %d: Bad number '%s': %s", + filename, linenum, arg, strerror(errno)); + if (val64 != 0 && val64 < 16) + fatal("%.200s line %d: RekeyLimit too small", + filename, linenum); + } + if (*activep && options->rekey_limit == -1) + options->rekey_limit = val64; + if (cp != NULL) { /* optional rekey interval present */ + if (strcmp(cp, "none") == 0) { + (void)strdelim(&cp); /* discard */ + break; + } + intptr = &options->rekey_interval; + goto parse_time; + } + break; + + case sGatewayPorts: + intptr = &options->fwd_opts.gateway_ports; + multistate_ptr = multistate_gatewayports; + goto parse_multistate; + + case sUseDNS: + intptr = &options->use_dns; + goto parse_flag; + + case sLogFacility: + log_facility_ptr = &options->log_facility; + arg = strdelim(&cp); + value = log_facility_number(arg); + if (value == SYSLOG_FACILITY_NOT_SET) + fatal("%.200s line %d: unsupported log facility '%s'", + filename, linenum, arg ? arg : "<NONE>"); + if (*log_facility_ptr == -1) + *log_facility_ptr = (SyslogFacility) value; + break; + + case sLogLevel: + log_level_ptr = &options->log_level; + arg = strdelim(&cp); + value = log_level_number(arg); + if (value == SYSLOG_LEVEL_NOT_SET) + fatal("%.200s line %d: unsupported log level '%s'", + filename, linenum, arg ? arg : "<NONE>"); + if (*activep && *log_level_ptr == -1) + *log_level_ptr = (LogLevel) value; + break; + + case sAllowTcpForwarding: + intptr = &options->allow_tcp_forwarding; + multistate_ptr = multistate_tcpfwd; + goto parse_multistate; + + case sAllowStreamLocalForwarding: + intptr = &options->allow_streamlocal_forwarding; + multistate_ptr = multistate_tcpfwd; + goto parse_multistate; + + case sAllowAgentForwarding: + intptr = &options->allow_agent_forwarding; + goto parse_flag; + + case sDisableForwarding: + intptr = &options->disable_forwarding; + goto parse_flag; + + case sAllowUsers: + while ((arg = strdelim(&cp)) && *arg != '\0') { + if (match_user(NULL, NULL, NULL, arg) == -1) + fatal("%s line %d: invalid AllowUsers pattern: " + "\"%.100s\"", filename, linenum, arg); + if (!*activep) + continue; + array_append(filename, linenum, "AllowUsers", + &options->allow_users, &options->num_allow_users, + arg); + } + break; + + case sDenyUsers: + while ((arg = strdelim(&cp)) && *arg != '\0') { + if (match_user(NULL, NULL, NULL, arg) == -1) + fatal("%s line %d: invalid DenyUsers pattern: " + "\"%.100s\"", filename, linenum, arg); + if (!*activep) + continue; + array_append(filename, linenum, "DenyUsers", + &options->deny_users, &options->num_deny_users, + arg); + } + break; + + case sAllowGroups: + while ((arg = strdelim(&cp)) && *arg != '\0') { + if (!*activep) + continue; + array_append(filename, linenum, "AllowGroups", + &options->allow_groups, &options->num_allow_groups, + arg); + } + break; + + case sDenyGroups: + while ((arg = strdelim(&cp)) && *arg != '\0') { + if (!*activep) + continue; + array_append(filename, linenum, "DenyGroups", + &options->deny_groups, &options->num_deny_groups, + arg); + } + break; + + case sCiphers: + arg = strdelim(&cp); + if (!arg || *arg == '\0') + fatal("%s line %d: Missing argument.", filename, linenum); + if (*arg != '-' && !ciphers_valid(*arg == '+' ? arg + 1 : arg)) + fatal("%s line %d: Bad SSH2 cipher spec '%s'.", + filename, linenum, arg ? arg : "<NONE>"); + if (options->ciphers == NULL) + options->ciphers = xstrdup(arg); + break; + + case sMacs: + arg = strdelim(&cp); + if (!arg || *arg == '\0') + fatal("%s line %d: Missing argument.", filename, linenum); + if (*arg != '-' && !mac_valid(*arg == '+' ? arg + 1 : arg)) + fatal("%s line %d: Bad SSH2 mac spec '%s'.", + filename, linenum, arg ? arg : "<NONE>"); + if (options->macs == NULL) + options->macs = xstrdup(arg); + break; + + case sKexAlgorithms: + arg = strdelim(&cp); + if (!arg || *arg == '\0') + fatal("%s line %d: Missing argument.", + filename, linenum); + if (*arg != '-' && + !kex_names_valid(*arg == '+' ? arg + 1 : arg)) + fatal("%s line %d: Bad SSH2 KexAlgorithms '%s'.", + filename, linenum, arg ? arg : "<NONE>"); + if (options->kex_algorithms == NULL) + options->kex_algorithms = xstrdup(arg); + break; + + case sSubsystem: + if (options->num_subsystems >= MAX_SUBSYSTEMS) { + fatal("%s line %d: too many subsystems defined.", + filename, linenum); + } + arg = strdelim(&cp); + if (!arg || *arg == '\0') + fatal("%s line %d: Missing subsystem name.", + filename, linenum); + if (!*activep) { + arg = strdelim(&cp); + break; + } + for (i = 0; i < options->num_subsystems; i++) + if (strcmp(arg, options->subsystem_name[i]) == 0) + fatal("%s line %d: Subsystem '%s' already defined.", + filename, linenum, arg); + options->subsystem_name[options->num_subsystems] = xstrdup(arg); + arg = strdelim(&cp); + if (!arg || *arg == '\0') + fatal("%s line %d: Missing subsystem command.", + filename, linenum); + options->subsystem_command[options->num_subsystems] = xstrdup(arg); + + /* Collect arguments (separate to executable) */ + p = xstrdup(arg); + len = strlen(p) + 1; + while ((arg = strdelim(&cp)) != NULL && *arg != '\0') { + len += 1 + strlen(arg); + p = xreallocarray(p, 1, len); + strlcat(p, " ", len); + strlcat(p, arg, len); + } + options->subsystem_args[options->num_subsystems] = p; + options->num_subsystems++; + break; + + case sMaxStartups: + arg = strdelim(&cp); + if (!arg || *arg == '\0') + fatal("%s line %d: Missing MaxStartups spec.", + filename, linenum); + if ((n = sscanf(arg, "%d:%d:%d", + &options->max_startups_begin, + &options->max_startups_rate, + &options->max_startups)) == 3) { + if (options->max_startups_begin > + options->max_startups || + options->max_startups_rate > 100 || + options->max_startups_rate < 1) + fatal("%s line %d: Illegal MaxStartups spec.", + filename, linenum); + } else if (n != 1) + fatal("%s line %d: Illegal MaxStartups spec.", + filename, linenum); + else + options->max_startups = options->max_startups_begin; + break; + + case sMaxAuthTries: + intptr = &options->max_authtries; + goto parse_int; + + case sMaxSessions: + intptr = &options->max_sessions; + goto parse_int; + + case sBanner: + charptr = &options->banner; + goto parse_filename; + + /* + * These options can contain %X options expanded at + * connect time, so that you can specify paths like: + * + * AuthorizedKeysFile /etc/ssh_keys/%u + */ + case sAuthorizedKeysFile: + if (*activep && options->num_authkeys_files == 0) { + while ((arg = strdelim(&cp)) && *arg != '\0') { + arg = tilde_expand_filename(arg, getuid()); + array_append(filename, linenum, + "AuthorizedKeysFile", + &options->authorized_keys_files, + &options->num_authkeys_files, arg); + free(arg); + } + } + return 0; + + case sAuthorizedPrincipalsFile: + charptr = &options->authorized_principals_file; + arg = strdelim(&cp); + if (!arg || *arg == '\0') + fatal("%s line %d: missing file name.", + filename, linenum); + if (*activep && *charptr == NULL) { + *charptr = tilde_expand_filename(arg, getuid()); + /* increase optional counter */ + if (intptr != NULL) + *intptr = *intptr + 1; + } + break; + + case sClientAliveInterval: + intptr = &options->client_alive_interval; + goto parse_time; + + case sClientAliveCountMax: + intptr = &options->client_alive_count_max; + goto parse_int; + + case sAcceptEnv: + while ((arg = strdelim(&cp)) && *arg != '\0') { + if (strchr(arg, '=') != NULL) + fatal("%s line %d: Invalid environment name.", + filename, linenum); + if (!*activep) + continue; + array_append(filename, linenum, "AcceptEnv", + &options->accept_env, &options->num_accept_env, + arg); + } + break; + + case sSetEnv: + uvalue = options->num_setenv; + while ((arg = strdelimw(&cp)) && *arg != '\0') { + if (strchr(arg, '=') == NULL) + fatal("%s line %d: Invalid environment.", + filename, linenum); + if (!*activep || uvalue != 0) + continue; + array_append(filename, linenum, "SetEnv", + &options->setenv, &options->num_setenv, arg); + } + break; + + case sPermitTunnel: + intptr = &options->permit_tun; + arg = strdelim(&cp); + if (!arg || *arg == '\0') + fatal("%s line %d: Missing yes/point-to-point/" + "ethernet/no argument.", filename, linenum); + value = -1; + for (i = 0; tunmode_desc[i].val != -1; i++) + if (strcmp(tunmode_desc[i].text, arg) == 0) { + value = tunmode_desc[i].val; + break; + } + if (value == -1) + fatal("%s line %d: Bad yes/point-to-point/ethernet/" + "no argument: %s", filename, linenum, arg); + if (*activep && *intptr == -1) + *intptr = value; + break; + + case sMatch: + if (cmdline) + fatal("Match directive not supported as a command-line " + "option"); + value = match_cfg_line(&cp, linenum, connectinfo); + if (value < 0) + fatal("%s line %d: Bad Match condition", filename, + linenum); + *activep = value; + break; + + case sPermitListen: + case sPermitOpen: + if (opcode == sPermitListen) { + uintptr = &options->num_permitted_listens; + chararrayptr = &options->permitted_listens; + } else { + uintptr = &options->num_permitted_opens; + chararrayptr = &options->permitted_opens; + } + arg = strdelim(&cp); + if (!arg || *arg == '\0') + fatal("%s line %d: missing %s specification", + filename, linenum, lookup_opcode_name(opcode)); + uvalue = *uintptr; /* modified later */ + if (strcmp(arg, "any") == 0 || strcmp(arg, "none") == 0) { + if (*activep && uvalue == 0) { + *uintptr = 1; + *chararrayptr = xcalloc(1, + sizeof(**chararrayptr)); + (*chararrayptr)[0] = xstrdup(arg); + } + break; + } + for (; arg != NULL && *arg != '\0'; arg = strdelim(&cp)) { + if (opcode == sPermitListen && + strchr(arg, ':') == NULL) { + /* + * Allow bare port number for PermitListen + * to indicate a wildcard listen host. + */ + xasprintf(&arg2, "*:%s", arg); + } else { + arg2 = xstrdup(arg); + p = hpdelim(&arg); + if (p == NULL) { + fatal("%s line %d: missing host in %s", + filename, linenum, + lookup_opcode_name(opcode)); + } + p = cleanhostname(p); + } + if (arg == NULL || + ((port = permitopen_port(arg)) < 0)) { + fatal("%s line %d: bad port number in %s", + filename, linenum, + lookup_opcode_name(opcode)); + } + if (*activep && uvalue == 0) { + array_append(filename, linenum, + lookup_opcode_name(opcode), + chararrayptr, uintptr, arg2); + } + free(arg2); + } + break; + + case sForceCommand: + if (cp == NULL || *cp == '\0') + fatal("%.200s line %d: Missing argument.", filename, + linenum); + len = strspn(cp, WHITESPACE); + if (*activep && options->adm_forced_command == NULL) + options->adm_forced_command = xstrdup(cp + len); + return 0; + + case sChrootDirectory: + charptr = &options->chroot_directory; + + arg = strdelim(&cp); + if (!arg || *arg == '\0') + fatal("%s line %d: missing file name.", + filename, linenum); + if (*activep && *charptr == NULL) + *charptr = xstrdup(arg); + break; + + case sTrustedUserCAKeys: + charptr = &options->trusted_user_ca_keys; + goto parse_filename; + + case sRevokedKeys: + charptr = &options->revoked_keys_file; + goto parse_filename; + + case sIPQoS: + arg = strdelim(&cp); + if ((value = parse_ipqos(arg)) == -1) + fatal("%s line %d: Bad IPQoS value: %s", + filename, linenum, arg); + arg = strdelim(&cp); + if (arg == NULL) + value2 = value; + else if ((value2 = parse_ipqos(arg)) == -1) + fatal("%s line %d: Bad IPQoS value: %s", + filename, linenum, arg); + if (*activep) { + options->ip_qos_interactive = value; + options->ip_qos_bulk = value2; + } + break; + + case sVersionAddendum: + if (cp == NULL || *cp == '\0') + fatal("%.200s line %d: Missing argument.", filename, + linenum); + len = strspn(cp, WHITESPACE); + if (*activep && options->version_addendum == NULL) { + if (strcasecmp(cp + len, "none") == 0) + options->version_addendum = xstrdup(""); + else if (strchr(cp + len, '\r') != NULL) + fatal("%.200s line %d: Invalid argument", + filename, linenum); + else + options->version_addendum = xstrdup(cp + len); + } + return 0; + + case sAuthorizedKeysCommand: + if (cp == NULL) + fatal("%.200s line %d: Missing argument.", filename, + linenum); + len = strspn(cp, WHITESPACE); + if (*activep && options->authorized_keys_command == NULL) { + if (cp[len] != '/' && strcasecmp(cp + len, "none") != 0) + fatal("%.200s line %d: AuthorizedKeysCommand " + "must be an absolute path", + filename, linenum); + options->authorized_keys_command = xstrdup(cp + len); + } + return 0; + + case sAuthorizedKeysCommandUser: + charptr = &options->authorized_keys_command_user; + + arg = strdelim(&cp); + if (!arg || *arg == '\0') + fatal("%s line %d: missing AuthorizedKeysCommandUser " + "argument.", filename, linenum); + if (*activep && *charptr == NULL) + *charptr = xstrdup(arg); + break; + + case sAuthorizedPrincipalsCommand: + if (cp == NULL) + fatal("%.200s line %d: Missing argument.", filename, + linenum); + len = strspn(cp, WHITESPACE); + if (*activep && + options->authorized_principals_command == NULL) { + if (cp[len] != '/' && strcasecmp(cp + len, "none") != 0) + fatal("%.200s line %d: " + "AuthorizedPrincipalsCommand must be " + "an absolute path", filename, linenum); + options->authorized_principals_command = + xstrdup(cp + len); + } + return 0; + + case sAuthorizedPrincipalsCommandUser: + charptr = &options->authorized_principals_command_user; + + arg = strdelim(&cp); + if (!arg || *arg == '\0') + fatal("%s line %d: missing " + "AuthorizedPrincipalsCommandUser argument.", + filename, linenum); + if (*activep && *charptr == NULL) + *charptr = xstrdup(arg); + break; + + case sAuthenticationMethods: + if (options->num_auth_methods == 0) { + value = 0; /* seen "any" pseudo-method */ + value2 = 0; /* successfully parsed any method */ + while ((arg = strdelim(&cp)) && *arg != '\0') { + if (strcmp(arg, "any") == 0) { + if (options->num_auth_methods > 0) { + fatal("%s line %d: \"any\" " + "must appear alone in " + "AuthenticationMethods", + filename, linenum); + } + value = 1; + } else if (value) { + fatal("%s line %d: \"any\" must appear " + "alone in AuthenticationMethods", + filename, linenum); + } else if (auth2_methods_valid(arg, 0) != 0) { + fatal("%s line %d: invalid " + "authentication method list.", + filename, linenum); + } + value2 = 1; + if (!*activep) + continue; + array_append(filename, linenum, + "AuthenticationMethods", + &options->auth_methods, + &options->num_auth_methods, arg); + } + if (value2 == 0) { + fatal("%s line %d: no AuthenticationMethods " + "specified", filename, linenum); + } + } + return 0; + + case sStreamLocalBindMask: + arg = strdelim(&cp); + if (!arg || *arg == '\0') + fatal("%s line %d: missing StreamLocalBindMask " + "argument.", filename, linenum); + /* Parse mode in octal format */ + value = strtol(arg, &p, 8); + if (arg == p || value < 0 || value > 0777) + fatal("%s line %d: Bad mask.", filename, linenum); + if (*activep) + options->fwd_opts.streamlocal_bind_mask = (mode_t)value; + break; + + case sStreamLocalBindUnlink: + intptr = &options->fwd_opts.streamlocal_bind_unlink; + goto parse_flag; + + case sFingerprintHash: + arg = strdelim(&cp); + if (!arg || *arg == '\0') + fatal("%.200s line %d: Missing argument.", + filename, linenum); + if ((value = ssh_digest_alg_by_name(arg)) == -1) + fatal("%.200s line %d: Invalid hash algorithm \"%s\".", + filename, linenum, arg); + if (*activep) + options->fingerprint_hash = value; + break; + + case sExposeAuthInfo: + intptr = &options->expose_userauth_info; + goto parse_flag; + + case sRDomain: + charptr = &options->routing_domain; + arg = strdelim(&cp); + if (!arg || *arg == '\0') + fatal("%.200s line %d: Missing argument.", + filename, linenum); + if (strcasecmp(arg, "none") != 0 && strcmp(arg, "%D") != 0 && + !valid_rdomain(arg)) + fatal("%s line %d: bad routing domain", + filename, linenum); + if (*activep && *charptr == NULL) + *charptr = xstrdup(arg); + break; + + case sDeprecated: + case sIgnore: + case sUnsupported: + do_log2(opcode == sIgnore ? + SYSLOG_LEVEL_DEBUG2 : SYSLOG_LEVEL_INFO, + "%s line %d: %s option %s", filename, linenum, + opcode == sUnsupported ? "Unsupported" : "Deprecated", arg); + while (arg) + arg = strdelim(&cp); + break; + + default: + fatal("%s line %d: Missing handler for opcode %s (%d)", + filename, linenum, arg, opcode); + } + if ((arg = strdelim(&cp)) != NULL && *arg != '\0') + fatal("%s line %d: garbage at end of line; \"%.200s\".", + filename, linenum, arg); + return 0; +} + +/* Reads the server configuration file. */ + +void +load_server_config(const char *filename, struct sshbuf *conf) +{ + char *line = NULL, *cp; + size_t linesize = 0; + FILE *f; + int r, lineno = 0; + + debug2("%s: filename %s", __func__, filename); + if ((f = fopen(filename, "r")) == NULL) { + perror(filename); + exit(1); + } + sshbuf_reset(conf); + while (getline(&line, &linesize, f) != -1) { + lineno++; + /* + * Trim out comments and strip whitespace + * NB - preserve newlines, they are needed to reproduce + * line numbers later for error messages + */ + if ((cp = strchr(line, '#')) != NULL) + memcpy(cp, "\n", 2); + cp = line + strspn(line, " \t\r"); + if ((r = sshbuf_put(conf, cp, strlen(cp))) != 0) + fatal("%s: buffer error: %s", __func__, ssh_err(r)); + } + free(line); + if ((r = sshbuf_put_u8(conf, 0)) != 0) + fatal("%s: buffer error: %s", __func__, ssh_err(r)); + fclose(f); + debug2("%s: done config len = %zu", __func__, sshbuf_len(conf)); +} + +void +parse_server_match_config(ServerOptions *options, + struct connection_info *connectinfo) +{ + ServerOptions mo; + + initialize_server_options(&mo); + parse_server_config(&mo, "reprocess config", cfg, connectinfo); + copy_set_server_options(options, &mo, 0); +} + +int parse_server_match_testspec(struct connection_info *ci, char *spec) +{ + char *p; + + while ((p = strsep(&spec, ",")) && *p != '\0') { + if (strncmp(p, "addr=", 5) == 0) { + ci->address = xstrdup(p + 5); + } else if (strncmp(p, "host=", 5) == 0) { + ci->host = xstrdup(p + 5); + } else if (strncmp(p, "user=", 5) == 0) { + ci->user = xstrdup(p + 5); + } else if (strncmp(p, "laddr=", 6) == 0) { + ci->laddress = xstrdup(p + 6); + } else if (strncmp(p, "rdomain=", 8) == 0) { + ci->rdomain = xstrdup(p + 8); + } else if (strncmp(p, "lport=", 6) == 0) { + ci->lport = a2port(p + 6); + if (ci->lport == -1) { + fprintf(stderr, "Invalid port '%s' in test mode" + " specification %s\n", p+6, p); + return -1; + } + } else { + fprintf(stderr, "Invalid test mode specification %s\n", + p); + return -1; + } + } + return 0; +} + +/* + * Copy any supported values that are set. + * + * If the preauth flag is set, we do not bother copying the string or + * array values that are not used pre-authentication, because any that we + * do use must be explicitly sent in mm_getpwnamallow(). + */ +void +copy_set_server_options(ServerOptions *dst, ServerOptions *src, int preauth) +{ +#define M_CP_INTOPT(n) do {\ + if (src->n != -1) \ + dst->n = src->n; \ +} while (0) + + M_CP_INTOPT(password_authentication); + M_CP_INTOPT(gss_authentication); + M_CP_INTOPT(pubkey_authentication); + M_CP_INTOPT(kerberos_authentication); + M_CP_INTOPT(hostbased_authentication); + M_CP_INTOPT(hostbased_uses_name_from_packet_only); + M_CP_INTOPT(kbd_interactive_authentication); + M_CP_INTOPT(permit_root_login); + M_CP_INTOPT(permit_empty_passwd); + + M_CP_INTOPT(allow_tcp_forwarding); + M_CP_INTOPT(allow_streamlocal_forwarding); + M_CP_INTOPT(allow_agent_forwarding); + M_CP_INTOPT(disable_forwarding); + M_CP_INTOPT(expose_userauth_info); + M_CP_INTOPT(permit_tun); + M_CP_INTOPT(fwd_opts.gateway_ports); + M_CP_INTOPT(fwd_opts.streamlocal_bind_unlink); + M_CP_INTOPT(x11_display_offset); + M_CP_INTOPT(x11_forwarding); + M_CP_INTOPT(x11_use_localhost); + M_CP_INTOPT(permit_tty); + M_CP_INTOPT(permit_user_rc); + M_CP_INTOPT(max_sessions); + M_CP_INTOPT(max_authtries); + M_CP_INTOPT(client_alive_count_max); + M_CP_INTOPT(client_alive_interval); + M_CP_INTOPT(ip_qos_interactive); + M_CP_INTOPT(ip_qos_bulk); + M_CP_INTOPT(rekey_limit); + M_CP_INTOPT(rekey_interval); + M_CP_INTOPT(log_level); + + /* + * The bind_mask is a mode_t that may be unsigned, so we can't use + * M_CP_INTOPT - it does a signed comparison that causes compiler + * warnings. + */ + if (src->fwd_opts.streamlocal_bind_mask != (mode_t)-1) { + dst->fwd_opts.streamlocal_bind_mask = + src->fwd_opts.streamlocal_bind_mask; + } + + /* M_CP_STROPT and M_CP_STRARRAYOPT should not appear before here */ +#define M_CP_STROPT(n) do {\ + if (src->n != NULL && dst->n != src->n) { \ + free(dst->n); \ + dst->n = src->n; \ + } \ +} while(0) +#define M_CP_STRARRAYOPT(s, num_s) do {\ + u_int i; \ + if (src->num_s != 0) { \ + for (i = 0; i < dst->num_s; i++) \ + free(dst->s[i]); \ + free(dst->s); \ + dst->s = xcalloc(src->num_s, sizeof(*dst->s)); \ + for (i = 0; i < src->num_s; i++) \ + dst->s[i] = xstrdup(src->s[i]); \ + dst->num_s = src->num_s; \ + } \ +} while(0) + + /* See comment in servconf.h */ + COPY_MATCH_STRING_OPTS(); + + /* Arguments that accept '+...' need to be expanded */ + assemble_algorithms(dst); + + /* + * The only things that should be below this point are string options + * which are only used after authentication. + */ + if (preauth) + return; + + /* These options may be "none" to clear a global setting */ + M_CP_STROPT(adm_forced_command); + if (option_clear_or_none(dst->adm_forced_command)) { + free(dst->adm_forced_command); + dst->adm_forced_command = NULL; + } + M_CP_STROPT(chroot_directory); + if (option_clear_or_none(dst->chroot_directory)) { + free(dst->chroot_directory); + dst->chroot_directory = NULL; + } +} + +#undef M_CP_INTOPT +#undef M_CP_STROPT +#undef M_CP_STRARRAYOPT + +void +parse_server_config(ServerOptions *options, const char *filename, + struct sshbuf *conf, struct connection_info *connectinfo) +{ + int active, linenum, bad_options = 0; + char *cp, *obuf, *cbuf; + + debug2("%s: config %s len %zu", __func__, filename, sshbuf_len(conf)); + + if ((obuf = cbuf = sshbuf_dup_string(conf)) == NULL) + fatal("%s: sshbuf_dup_string failed", __func__); + active = connectinfo ? 0 : 1; + linenum = 1; + while ((cp = strsep(&cbuf, "\n")) != NULL) { + if (process_server_config_line(options, cp, filename, + linenum++, &active, connectinfo) != 0) + bad_options++; + } + free(obuf); + if (bad_options > 0) + fatal("%s: terminating, %d bad configuration options", + filename, bad_options); + process_queued_listen_addrs(options); +} + +static const char * +fmt_multistate_int(int val, const struct multistate *m) +{ + u_int i; + + for (i = 0; m[i].key != NULL; i++) { + if (m[i].value == val) + return m[i].key; + } + return "UNKNOWN"; +} + +static const char * +fmt_intarg(ServerOpCodes code, int val) +{ + if (val == -1) + return "unset"; + switch (code) { + case sAddressFamily: + return fmt_multistate_int(val, multistate_addressfamily); + case sPermitRootLogin: + return fmt_multistate_int(val, multistate_permitrootlogin); + case sGatewayPorts: + return fmt_multistate_int(val, multistate_gatewayports); + case sCompression: + return fmt_multistate_int(val, multistate_compression); + case sAllowTcpForwarding: + return fmt_multistate_int(val, multistate_tcpfwd); + case sAllowStreamLocalForwarding: + return fmt_multistate_int(val, multistate_tcpfwd); + case sFingerprintHash: + return ssh_digest_alg_name(val); + default: + switch (val) { + case 0: + return "no"; + case 1: + return "yes"; + default: + return "UNKNOWN"; + } + } +} + +static void +dump_cfg_int(ServerOpCodes code, int val) +{ + printf("%s %d\n", lookup_opcode_name(code), val); +} + +static void +dump_cfg_oct(ServerOpCodes code, int val) +{ + printf("%s 0%o\n", lookup_opcode_name(code), val); +} + +static void +dump_cfg_fmtint(ServerOpCodes code, int val) +{ + printf("%s %s\n", lookup_opcode_name(code), fmt_intarg(code, val)); +} + +static void +dump_cfg_string(ServerOpCodes code, const char *val) +{ + printf("%s %s\n", lookup_opcode_name(code), + val == NULL ? "none" : val); +} + +static void +dump_cfg_strarray(ServerOpCodes code, u_int count, char **vals) +{ + u_int i; + + for (i = 0; i < count; i++) + printf("%s %s\n", lookup_opcode_name(code), vals[i]); +} + +static void +dump_cfg_strarray_oneline(ServerOpCodes code, u_int count, char **vals) +{ + u_int i; + + if (count <= 0 && code != sAuthenticationMethods) + return; + printf("%s", lookup_opcode_name(code)); + for (i = 0; i < count; i++) + printf(" %s", vals[i]); + if (code == sAuthenticationMethods && count == 0) + printf(" any"); + printf("\n"); +} + +static char * +format_listen_addrs(struct listenaddr *la) +{ + int r; + struct addrinfo *ai; + char addr[NI_MAXHOST], port[NI_MAXSERV]; + char *laddr1 = xstrdup(""), *laddr2 = NULL; + + /* + * ListenAddress must be after Port. add_one_listen_addr pushes + * addresses onto a stack, so to maintain ordering we need to + * print these in reverse order. + */ + for (ai = la->addrs; ai; ai = ai->ai_next) { + if ((r = getnameinfo(ai->ai_addr, ai->ai_addrlen, addr, + sizeof(addr), port, sizeof(port), + NI_NUMERICHOST|NI_NUMERICSERV)) != 0) { + error("getnameinfo: %.100s", ssh_gai_strerror(r)); + continue; + } + laddr2 = laddr1; + if (ai->ai_family == AF_INET6) { + xasprintf(&laddr1, "listenaddress [%s]:%s%s%s\n%s", + addr, port, + la->rdomain == NULL ? "" : " rdomain ", + la->rdomain == NULL ? "" : la->rdomain, + laddr2); + } else { + xasprintf(&laddr1, "listenaddress %s:%s%s%s\n%s", + addr, port, + la->rdomain == NULL ? "" : " rdomain ", + la->rdomain == NULL ? "" : la->rdomain, + laddr2); + } + free(laddr2); + } + return laddr1; +} + +void +dump_config(ServerOptions *o) +{ + char *s; + u_int i; + + /* these are usually at the top of the config */ + for (i = 0; i < o->num_ports; i++) + printf("port %d\n", o->ports[i]); + dump_cfg_fmtint(sAddressFamily, o->address_family); + + for (i = 0; i < o->num_listen_addrs; i++) { + s = format_listen_addrs(&o->listen_addrs[i]); + printf("%s", s); + free(s); + } + + /* integer arguments */ +#ifdef USE_PAM + dump_cfg_fmtint(sUsePAM, o->use_pam); +#endif + dump_cfg_int(sLoginGraceTime, o->login_grace_time); + dump_cfg_int(sX11DisplayOffset, o->x11_display_offset); + dump_cfg_int(sMaxAuthTries, o->max_authtries); + dump_cfg_int(sMaxSessions, o->max_sessions); + dump_cfg_int(sClientAliveInterval, o->client_alive_interval); + dump_cfg_int(sClientAliveCountMax, o->client_alive_count_max); + dump_cfg_oct(sStreamLocalBindMask, o->fwd_opts.streamlocal_bind_mask); + + /* formatted integer arguments */ + dump_cfg_fmtint(sPermitRootLogin, o->permit_root_login); + dump_cfg_fmtint(sIgnoreRhosts, o->ignore_rhosts); + dump_cfg_fmtint(sIgnoreUserKnownHosts, o->ignore_user_known_hosts); + dump_cfg_fmtint(sHostbasedAuthentication, o->hostbased_authentication); + dump_cfg_fmtint(sHostbasedUsesNameFromPacketOnly, + o->hostbased_uses_name_from_packet_only); + dump_cfg_fmtint(sPubkeyAuthentication, o->pubkey_authentication); +#ifdef KRB5 + dump_cfg_fmtint(sKerberosAuthentication, o->kerberos_authentication); + dump_cfg_fmtint(sKerberosOrLocalPasswd, o->kerberos_or_local_passwd); + dump_cfg_fmtint(sKerberosTicketCleanup, o->kerberos_ticket_cleanup); +# ifdef USE_AFS + dump_cfg_fmtint(sKerberosGetAFSToken, o->kerberos_get_afs_token); +# endif +#endif +#ifdef GSSAPI + dump_cfg_fmtint(sGssAuthentication, o->gss_authentication); + dump_cfg_fmtint(sGssCleanupCreds, o->gss_cleanup_creds); +#endif + dump_cfg_fmtint(sPasswordAuthentication, o->password_authentication); + dump_cfg_fmtint(sKbdInteractiveAuthentication, + o->kbd_interactive_authentication); + dump_cfg_fmtint(sChallengeResponseAuthentication, + o->challenge_response_authentication); + dump_cfg_fmtint(sPrintMotd, o->print_motd); +#ifndef DISABLE_LASTLOG + dump_cfg_fmtint(sPrintLastLog, o->print_lastlog); +#endif + dump_cfg_fmtint(sX11Forwarding, o->x11_forwarding); + dump_cfg_fmtint(sX11UseLocalhost, o->x11_use_localhost); + dump_cfg_fmtint(sPermitTTY, o->permit_tty); + dump_cfg_fmtint(sPermitUserRC, o->permit_user_rc); + dump_cfg_fmtint(sStrictModes, o->strict_modes); + dump_cfg_fmtint(sTCPKeepAlive, o->tcp_keep_alive); + dump_cfg_fmtint(sEmptyPasswd, o->permit_empty_passwd); + dump_cfg_fmtint(sCompression, o->compression); + dump_cfg_fmtint(sGatewayPorts, o->fwd_opts.gateway_ports); + dump_cfg_fmtint(sUseDNS, o->use_dns); + dump_cfg_fmtint(sAllowTcpForwarding, o->allow_tcp_forwarding); + dump_cfg_fmtint(sAllowAgentForwarding, o->allow_agent_forwarding); + dump_cfg_fmtint(sDisableForwarding, o->disable_forwarding); + dump_cfg_fmtint(sAllowStreamLocalForwarding, o->allow_streamlocal_forwarding); + dump_cfg_fmtint(sStreamLocalBindUnlink, o->fwd_opts.streamlocal_bind_unlink); + dump_cfg_fmtint(sFingerprintHash, o->fingerprint_hash); + dump_cfg_fmtint(sExposeAuthInfo, o->expose_userauth_info); + + /* string arguments */ + dump_cfg_string(sPidFile, o->pid_file); + dump_cfg_string(sXAuthLocation, o->xauth_location); + dump_cfg_string(sCiphers, o->ciphers ? o->ciphers : KEX_SERVER_ENCRYPT); + dump_cfg_string(sMacs, o->macs ? o->macs : KEX_SERVER_MAC); + dump_cfg_string(sBanner, o->banner); + dump_cfg_string(sForceCommand, o->adm_forced_command); + dump_cfg_string(sChrootDirectory, o->chroot_directory); + dump_cfg_string(sTrustedUserCAKeys, o->trusted_user_ca_keys); + dump_cfg_string(sRevokedKeys, o->revoked_keys_file); + dump_cfg_string(sAuthorizedPrincipalsFile, + o->authorized_principals_file); + dump_cfg_string(sVersionAddendum, *o->version_addendum == '\0' + ? "none" : o->version_addendum); + dump_cfg_string(sAuthorizedKeysCommand, o->authorized_keys_command); + dump_cfg_string(sAuthorizedKeysCommandUser, o->authorized_keys_command_user); + dump_cfg_string(sAuthorizedPrincipalsCommand, o->authorized_principals_command); + dump_cfg_string(sAuthorizedPrincipalsCommandUser, o->authorized_principals_command_user); + dump_cfg_string(sHostKeyAgent, o->host_key_agent); + dump_cfg_string(sKexAlgorithms, + o->kex_algorithms ? o->kex_algorithms : KEX_SERVER_KEX); + dump_cfg_string(sCASignatureAlgorithms, o->ca_sign_algorithms ? + o->ca_sign_algorithms : SSH_ALLOWED_CA_SIGALGS); + dump_cfg_string(sHostbasedAcceptedKeyTypes, o->hostbased_key_types ? + o->hostbased_key_types : KEX_DEFAULT_PK_ALG); + dump_cfg_string(sHostKeyAlgorithms, o->hostkeyalgorithms ? + o->hostkeyalgorithms : KEX_DEFAULT_PK_ALG); + dump_cfg_string(sPubkeyAcceptedKeyTypes, o->pubkey_key_types ? + o->pubkey_key_types : KEX_DEFAULT_PK_ALG); + dump_cfg_string(sRDomain, o->routing_domain); + + /* string arguments requiring a lookup */ + dump_cfg_string(sLogLevel, log_level_name(o->log_level)); + dump_cfg_string(sLogFacility, log_facility_name(o->log_facility)); + + /* string array arguments */ + dump_cfg_strarray_oneline(sAuthorizedKeysFile, o->num_authkeys_files, + o->authorized_keys_files); + dump_cfg_strarray(sHostKeyFile, o->num_host_key_files, + o->host_key_files); + dump_cfg_strarray(sHostCertificate, o->num_host_cert_files, + o->host_cert_files); + dump_cfg_strarray(sAllowUsers, o->num_allow_users, o->allow_users); + dump_cfg_strarray(sDenyUsers, o->num_deny_users, o->deny_users); + dump_cfg_strarray(sAllowGroups, o->num_allow_groups, o->allow_groups); + dump_cfg_strarray(sDenyGroups, o->num_deny_groups, o->deny_groups); + dump_cfg_strarray(sAcceptEnv, o->num_accept_env, o->accept_env); + dump_cfg_strarray(sSetEnv, o->num_setenv, o->setenv); + dump_cfg_strarray_oneline(sAuthenticationMethods, + o->num_auth_methods, o->auth_methods); + + /* other arguments */ + for (i = 0; i < o->num_subsystems; i++) + printf("subsystem %s %s\n", o->subsystem_name[i], + o->subsystem_args[i]); + + printf("maxstartups %d:%d:%d\n", o->max_startups_begin, + o->max_startups_rate, o->max_startups); + + s = NULL; + for (i = 0; tunmode_desc[i].val != -1; i++) { + if (tunmode_desc[i].val == o->permit_tun) { + s = tunmode_desc[i].text; + break; + } + } + dump_cfg_string(sPermitTunnel, s); + + printf("ipqos %s ", iptos2str(o->ip_qos_interactive)); + printf("%s\n", iptos2str(o->ip_qos_bulk)); + + printf("rekeylimit %llu %d\n", (unsigned long long)o->rekey_limit, + o->rekey_interval); + + printf("permitopen"); + if (o->num_permitted_opens == 0) + printf(" any"); + else { + for (i = 0; i < o->num_permitted_opens; i++) + printf(" %s", o->permitted_opens[i]); + } + printf("\n"); + printf("permitlisten"); + if (o->num_permitted_listens == 0) + printf(" any"); + else { + for (i = 0; i < o->num_permitted_listens; i++) + printf(" %s", o->permitted_listens[i]); + } + printf("\n"); + + if (o->permit_user_env_whitelist == NULL) { + dump_cfg_fmtint(sPermitUserEnvironment, o->permit_user_env); + } else { + printf("permituserenvironment %s\n", + o->permit_user_env_whitelist); + } + +} |