/* $NetBSD: servconf.c,v 1.30.2.1 2023/12/25 12:31:06 martin Exp $ */ /* $OpenBSD: servconf.c,v 1.403 2023/10/11 22:42:26 djm Exp $ */ /* * Copyright (c) 1995 Tatu Ylonen , 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" __RCSID("$NetBSD: servconf.c,v 1.30.2.1 2023/12/25 12:31:06 martin Exp $"); #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #ifdef KRB4 #include #ifdef AFS #include #endif /* AFS */ #endif /* KRB4 */ #include "xmalloc.h" #include "ssh.h" #include "log.h" #include "sshbuf.h" #include "misc.h" #include "servconf.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 "fmt_scaled.h" #ifdef WITH_LDAP_PUBKEY #include "ldapauth.h" #endif #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); static void parse_server_config_depth(ServerOptions *options, const char *filename, struct sshbuf *conf, struct include_list *includes, struct connection_info *connectinfo, int flags, int *activep, int depth); /* 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_root_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->num_log_verbose = 0; options->log_verbose = NULL; options->hostbased_authentication = -1; options->hostbased_uses_name_from_packet_only = -1; options->hostbased_accepted_algos = NULL; options->hostkeyalgorithms = NULL; options->pubkey_authentication = -1; options->pubkey_auth_options = -1; options->pubkey_accepted_algos = NULL; options->kerberos_authentication = -1; options->kerberos_or_local_passwd = -1; options->kerberos_ticket_cleanup = -1; #if defined(AFS) || defined(KRB5) options->kerberos_tgt_passing = -1; #endif #ifdef AFS options->afs_token_passing = -1; #endif 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->permit_empty_passwd = -1; options->permit_user_env = -1; options->permit_user_env_allowlist = 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; #ifdef WITH_LDAP_PUBKEY /* XXX dirty */ options->lpk.ld = NULL; options->lpk.on = -1; options->lpk.servers = NULL; options->lpk.u_basedn = NULL; options->lpk.g_basedn = NULL; options->lpk.binddn = NULL; options->lpk.bindpw = NULL; options->lpk.sgroup = NULL; options->lpk.filter = NULL; options->lpk.fgroup = NULL; options->lpk.l_conf = NULL; options->lpk.tls = -1; options->lpk.b_timeout.tv_sec = -1; options->lpk.s_timeout.tv_sec = -1; options->lpk.flags = FLAG_EMPTY; options->lpk.pub_key_attr = NULL; #endif 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->per_source_max_startups = -1; options->per_source_masklen_ipv4 = -1; options->per_source_masklen_ipv6 = -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->sk_provider = 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; options->required_rsa_size = -1; options->channel_timeouts = NULL; options->num_channel_timeouts = 0; options->unused_connection_timeout = -1; options->none_enabled = -1; options->tcp_rcv_buf_poll = -1; options->hpn_disabled = -1; options->hpn_buffer_size = -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; char *def_cipher, *def_mac, *def_kex, *def_key, *def_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, ','); /* remove unsupported algos from default lists */ def_cipher = match_filter_allowlist(KEX_SERVER_ENCRYPT, all_cipher); def_mac = match_filter_allowlist(KEX_SERVER_MAC, all_mac); def_kex = match_filter_allowlist(KEX_SERVER_KEX, all_kex); def_key = match_filter_allowlist(KEX_DEFAULT_PK_ALG, all_key); def_sig = match_filter_allowlist(SSH_ALLOWED_CA_SIGALGS, all_sig); #define ASSEMBLE(what, defaults, all) \ do { \ if ((r = kex_assemble_names(&o->what, defaults, all)) != 0) \ fatal_fr(r, "%s", #what); \ } while (0) ASSEMBLE(ciphers, def_cipher, all_cipher); ASSEMBLE(macs, def_mac, all_mac); ASSEMBLE(kex_algorithms, def_kex, all_kex); ASSEMBLE(hostkeyalgorithms, def_key, all_key); ASSEMBLE(hostbased_accepted_algos, def_key, all_key); ASSEMBLE(pubkey_accepted_algos, def_key, all_key); ASSEMBLE(ca_sign_algorithms, def_sig, all_sig); #undef ASSEMBLE free(all_cipher); free(all_mac); free(all_kex); free(all_key); free(all_sig); free(def_cipher); free(def_mac); free(def_kex); free(def_key); free(def_sig); } void servconf_add_hostkey(const char *file, const int line, ServerOptions *options, const char *path, int userprovided) { char *apath = derelativise_path(path); opt_array_append2(file, line, "HostKey", &options->host_key_files, &options->host_key_file_userprovided, &options->num_host_key_files, apath, userprovided); free(apath); } void servconf_add_hostcert(const char *file, const int line, ServerOptions *options, const char *path) { char *apath = derelativise_path(path); opt_array_append(file, line, "HostCertificate", &options->host_cert_files, &options->num_host_cert_files, apath); free(apath); } void fill_default_server_options(ServerOptions *options) { /* needed for hpn socket tests */ int sock; int socksize; socklen_t socksizelen = sizeof(int); /* Portable-specific options */ if (options->use_pam == -1) options->use_pam = 0; /* Standard Options */ u_int i; if (options->num_host_key_files == 0) { /* fill default hostkeys */ servconf_add_hostkey("[default]", 0, options, _PATH_HOST_RSA_KEY_FILE, 0); servconf_add_hostkey("[default]", 0, options, _PATH_HOST_ECDSA_KEY_FILE, 0); servconf_add_hostkey("[default]", 0, options, _PATH_HOST_ED25519_KEY_FILE, 0); #ifdef WITH_XMSS servconf_add_hostkey("[default]", 0, options, _PATH_HOST_XMSS_KEY_FILE, 0); #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->moduli_file == NULL) options->moduli_file = xstrdup(_PATH_DH_MODULI); 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_root_rhosts == -1) options->ignore_root_rhosts = options->ignore_rhosts; 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->pubkey_auth_options == -1) options->pubkey_auth_options = 0; 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 defined(AFS) || defined(KRB5) if (options->kerberos_tgt_passing == -1) options->kerberos_tgt_passing = 0; #endif #ifdef AFS if (options->afs_token_passing == -1) options->afs_token_passing = 0; #endif 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 = 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_allowlist = NULL; } if (options->compression == -1) #ifdef WITH_ZLIB options->compression = COMP_DELAYED; #else options->compression = COMP_NONE; #endif 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->per_source_max_startups == -1) options->per_source_max_startups = INT_MAX; if (options->per_source_masklen_ipv4 == -1) options->per_source_masklen_ipv4 = 32; if (options->per_source_masklen_ipv6 == -1) options->per_source_masklen_ipv6 = 128; 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) { opt_array_append("[default]", 0, "AuthorizedKeysFiles", &options->authorized_keys_files, &options->num_authkeys_files, _PATH_SSH_USER_PERMITTED_KEYS); opt_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->hpn_disabled == -1) options->hpn_disabled = 0; if (options->hpn_buffer_size == -1) { /* option not explicitly set. Now we have to figure out */ /* what value to use */ if (options->hpn_disabled == 1) { options->hpn_buffer_size = CHAN_SES_WINDOW_DEFAULT; } else { /* get the current RCV size and set it to that */ /*create a socket but don't connect it */ /* we use that the get the rcv socket size */ sock = socket(AF_INET, SOCK_STREAM, 0); getsockopt(sock, SOL_SOCKET, SO_RCVBUF, &socksize, &socksizelen); close(sock); options->hpn_buffer_size = socksize; debug ("HPN Buffer Size: %d", options->hpn_buffer_size); } } else { /* we have to do this incase the user sets both values in a contradictory */ /* manner. hpn_disabled overrrides hpn_buffer_size*/ if (options->hpn_disabled <= 0) { if (options->hpn_buffer_size == 0) options->hpn_buffer_size = 1; /* limit the maximum buffer to 64MB */ if (options->hpn_buffer_size > 64*1024) { options->hpn_buffer_size = 64*1024*1024; } else { options->hpn_buffer_size *= 1024; } } else options->hpn_buffer_size = CHAN_TCP_WINDOW_DEFAULT; } #ifdef WITH_LDAP_PUBKEY if (options->lpk.on == -1) options->lpk.on = _DEFAULT_LPK_ON; if (options->lpk.servers == NULL) options->lpk.servers = _DEFAULT_LPK_SERVERS; if (options->lpk.u_basedn == NULL) options->lpk.u_basedn = _DEFAULT_LPK_UDN; if (options->lpk.g_basedn == NULL) options->lpk.g_basedn = _DEFAULT_LPK_GDN; if (options->lpk.binddn == NULL) options->lpk.binddn = _DEFAULT_LPK_BINDDN; if (options->lpk.bindpw == NULL) options->lpk.bindpw = _DEFAULT_LPK_BINDPW; if (options->lpk.sgroup == NULL) options->lpk.sgroup = _DEFAULT_LPK_SGROUP; if (options->lpk.filter == NULL) options->lpk.filter = _DEFAULT_LPK_FILTER; if (options->lpk.tls == -1) options->lpk.tls = _DEFAULT_LPK_TLS; if (options->lpk.b_timeout.tv_sec == -1) options->lpk.b_timeout.tv_sec = _DEFAULT_LPK_BTIMEOUT; if (options->lpk.s_timeout.tv_sec == -1) options->lpk.s_timeout.tv_sec = _DEFAULT_LPK_STIMEOUT; if (options->lpk.l_conf == NULL) options->lpk.l_conf = _DEFAULT_LPK_LDP; if (options->lpk.pub_key_attr == NULL) options->lpk.pub_key_attr = __UNCONST(_DEFAULT_LPK_PUB); #endif 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; if (options->sk_provider == NULL) options->sk_provider = xstrdup("internal"); if (options->required_rsa_size == -1) options->required_rsa_size = SSH_RSA_MINIMUM_MODULUS_SIZE; if (options->unused_connection_timeout == -1) options->unused_connection_timeout = 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) #define CLEAR_ON_NONE_ARRAY(v, nv, none) \ do { \ if (options->nv == 1 && \ strcasecmp(options->v[0], none) == 0) { \ free(options->v[0]); \ free(options->v); \ options->v = NULL; \ options->nv = 0; \ } \ } 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->sk_provider); 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); CLEAR_ON_NONE(options->host_key_agent); 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]); CLEAR_ON_NONE_ARRAY(channel_timeouts, num_channel_timeouts, "none"); CLEAR_ON_NONE_ARRAY(auth_methods, num_auth_methods, "any"); #undef CLEAR_ON_NONE #undef CLEAR_ON_NONE_ARRAY } /* Keyword tokens. */ typedef enum { sBadOption, /* == unknown option */ sUsePAM, sPort, sHostKeyFile, sLoginGraceTime, sPermitRootLogin, sLogFacility, sLogLevel, sLogVerbose, sKerberosAuthentication, sKerberosOrLocalPasswd, sKerberosTicketCleanup, sKerberosGetAFSToken, sKerberosTgtPassing, 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, sModuliFile, sGatewayPorts, sPubkeyAuthentication, sPubkeyAcceptedAlgorithms, sXAuthLocation, sSubsystem, sMaxStartups, sMaxAuthTries, sMaxSessions, sBanner, sUseDNS, sHostbasedAuthentication, sHostbasedUsesNameFromPacketOnly, sHostbasedAcceptedAlgorithms, sHostKeyAlgorithms, sPerSourceMaxStartups, sPerSourceNetBlockSize, sClientAliveInterval, sClientAliveCountMax, sAuthorizedKeysFile, sGssAuthentication, sGssCleanupCreds, sGssStrictAcceptor, sAcceptEnv, sSetEnv, sPermitTunnel, sMatch, sPermitOpen, sPermitListen, sForceCommand, sChrootDirectory, sUsePrivilegeSeparation, sAllowAgentForwarding, sHostCertificate, sInclude, sRevokedKeys, sTrustedUserCAKeys, sAuthorizedPrincipalsFile, sAuthorizedPrincipalsCommand, sAuthorizedPrincipalsCommandUser, sKexAlgorithms, sCASignatureAlgorithms, sIPQoS, sVersionAddendum, sIgnoreRootRhosts, sNoneEnabled, sTcpRcvBufPoll,sHPNDisabled, sHPNBufferSize, sAuthorizedKeysCommand, sAuthorizedKeysCommandUser, sAuthenticationMethods, sHostKeyAgent, sPermitUserRC, sStreamLocalBindMask, sStreamLocalBindUnlink, sAllowStreamLocalForwarding, sFingerprintHash, sDisableForwarding, sExposeAuthInfo, sRDomain, sPubkeyAuthOptions, sSecurityKeyProvider, sRequiredRSASize, sChannelTimeout, sUnusedConnectionTimeout, sDeprecated, sIgnore, sUnsupported #ifdef WITH_LDAP_PUBKEY ,sLdapPublickey, sLdapServers, sLdapUserDN ,sLdapGroupDN, sBindDN, sBindPw, sMyGroup ,sLdapFilter, sForceTLS, sBindTimeout ,sSearchTimeout, sLdapConf ,sLpkPubKeyAttr #endif } ServerOpCodes; #define SSHCFG_GLOBAL 0x01 /* allowed in main section of config */ #define SSHCFG_MATCH 0x02 /* allowed inside a Match section */ #define SSHCFG_ALL (SSHCFG_GLOBAL|SSHCFG_MATCH) #define SSHCFG_NEVERMATCH 0x04 /* Match never matches; internal only */ #define SSHCFG_MATCH_ONLY 0x08 /* Match only in conditional blocks; internal only */ /* Textual representation of the tokens. */ static struct { const char *name; ServerOpCodes opcode; u_int flags; } keywords[] = { #ifdef USE_PAM { "usepam", sUsePAM, SSHCFG_GLOBAL }, #else { "usepam", sUnsupported, SSHCFG_GLOBAL }, #endif { "port", sPort, SSHCFG_GLOBAL }, { "hostkey", sHostKeyFile, SSHCFG_GLOBAL }, { "hostdsakey", sHostKeyFile, SSHCFG_GLOBAL }, /* alias */ { "hostkeyagent", sHostKeyAgent, SSHCFG_GLOBAL }, { "pidfile", sPidFile, SSHCFG_GLOBAL }, { "modulifile", sModuliFile, 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 }, { "logverbose", sLogVerbose, SSHCFG_ALL }, { "rhostsauthentication", sDeprecated, SSHCFG_GLOBAL }, { "rhostsrsaauthentication", sDeprecated, SSHCFG_ALL }, { "hostbasedauthentication", sHostbasedAuthentication, SSHCFG_ALL }, { "hostbasedusesnamefrompacketonly", sHostbasedUsesNameFromPacketOnly, SSHCFG_ALL }, { "hostbasedacceptedalgorithms", sHostbasedAcceptedAlgorithms, SSHCFG_ALL }, { "hostbasedacceptedkeytypes", sHostbasedAcceptedAlgorithms, SSHCFG_ALL }, /* obsolete */ { "hostkeyalgorithms", sHostKeyAlgorithms, SSHCFG_GLOBAL }, { "rsaauthentication", sDeprecated, SSHCFG_ALL }, { "pubkeyauthentication", sPubkeyAuthentication, SSHCFG_ALL }, { "pubkeyacceptedalgorithms", sPubkeyAcceptedAlgorithms, SSHCFG_ALL }, { "pubkeyacceptedkeytypes", sPubkeyAcceptedAlgorithms, SSHCFG_ALL }, /* obsolete */ { "pubkeyauthoptions", sPubkeyAuthOptions, SSHCFG_ALL }, { "dsaauthentication", sPubkeyAuthentication, SSHCFG_GLOBAL }, /* alias */ #ifdef KRB5 { "kerberosauthentication", sKerberosAuthentication, SSHCFG_ALL }, { "kerberosorlocalpasswd", sKerberosOrLocalPasswd, SSHCFG_GLOBAL }, { "kerberosticketcleanup", sKerberosTicketCleanup, SSHCFG_GLOBAL }, { "kerberosgetafstoken", sKerberosGetAFSToken, SSHCFG_GLOBAL }, #else { "kerberosauthentication", sUnsupported, SSHCFG_ALL }, { "kerberosorlocalpasswd", sUnsupported, SSHCFG_GLOBAL }, { "kerberosticketcleanup", sUnsupported, SSHCFG_GLOBAL }, { "kerberosgetafstoken", sUnsupported, SSHCFG_GLOBAL }, #endif #if defined(AFS) || defined(KRB5) { "kerberostgtpassing", sKerberosTgtPassing, SSHCFG_GLOBAL }, #else { "kerberostgtpassing", sUnsupported, SSHCFG_GLOBAL }, #endif { "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", sKbdInteractiveAuthentication, SSHCFG_GLOBAL }, { "skeyauthentication", sKbdInteractiveAuthentication, SSHCFG_GLOBAL }, /* alias */ { "checkmail", sDeprecated, SSHCFG_GLOBAL }, { "listenaddress", sListenAddress, SSHCFG_GLOBAL }, { "addressfamily", sAddressFamily, SSHCFG_GLOBAL }, { "printmotd", sPrintMotd, SSHCFG_GLOBAL }, { "printlastlog", sPrintLastLog, SSHCFG_GLOBAL }, { "ignorerhosts", sIgnoreRhosts, SSHCFG_ALL }, { "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_ALL }, { "maxstartups", sMaxStartups, SSHCFG_GLOBAL }, { "persourcemaxstartups", sPerSourceMaxStartups, SSHCFG_GLOBAL }, { "persourcenetblocksize", sPerSourceNetBlockSize, 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 }, #ifdef WITH_LDAP_PUBKEY { _DEFAULT_LPK_TOKEN, sLdapPublickey, SSHCFG_GLOBAL }, { _DEFAULT_SRV_TOKEN, sLdapServers, SSHCFG_GLOBAL }, { _DEFAULT_USR_TOKEN, sLdapUserDN, SSHCFG_GLOBAL }, { _DEFAULT_GRP_TOKEN, sLdapGroupDN, SSHCFG_GLOBAL }, { _DEFAULT_BDN_TOKEN, sBindDN, SSHCFG_GLOBAL }, { _DEFAULT_BPW_TOKEN, sBindPw, SSHCFG_GLOBAL }, { _DEFAULT_MYG_TOKEN, sMyGroup, SSHCFG_GLOBAL }, { _DEFAULT_FIL_TOKEN, sLdapFilter, SSHCFG_GLOBAL }, { _DEFAULT_TLS_TOKEN, sForceTLS, SSHCFG_GLOBAL }, { _DEFAULT_BTI_TOKEN, sBindTimeout, SSHCFG_GLOBAL }, { _DEFAULT_STI_TOKEN, sSearchTimeout, SSHCFG_GLOBAL }, { _DEFAULT_LDP_TOKEN, sLdapConf, SSHCFG_GLOBAL }, { "LpkPubKeyAttr", sLpkPubKeyAttr, SSHCFG_GLOBAL }, #endif { "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 }, { "include", sInclude, SSHCFG_ALL }, { "ipqos", sIPQoS, SSHCFG_ALL }, { "authorizedkeyscommand", sAuthorizedKeysCommand, SSHCFG_ALL }, { "authorizedkeyscommanduser", sAuthorizedKeysCommandUser, SSHCFG_ALL }, { "authorizedprincipalscommand", sAuthorizedPrincipalsCommand, SSHCFG_ALL }, { "authorizedprincipalscommanduser", sAuthorizedPrincipalsCommandUser, SSHCFG_ALL }, { "versionaddendum", sVersionAddendum, SSHCFG_GLOBAL }, { "noneenabled", sNoneEnabled, SSHCFG_ALL }, { "hpndisabled", sHPNDisabled, SSHCFG_ALL }, { "hpnbuffersize", sHPNBufferSize, SSHCFG_ALL }, { "tcprcvbufpoll", sTcpRcvBufPoll, SSHCFG_ALL }, { "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 }, { "securitykeyprovider", sSecurityKeyProvider, SSHCFG_GLOBAL }, { "requiredrsasize", sRequiredRSASize, SSHCFG_ALL }, { "channeltimeout", sChannelTimeout, SSHCFG_ALL }, { "unusedconnectiontimeout", sUnusedConnectionTimeout, SSHCFG_ALL }, { NULL, sBadOption, 0 } }; static struct { int val; const 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) { debug ("Config token is %s", keywords[i].name); *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 (path_absolute(expanded)) return expanded; if (getcwd(cwd, sizeof(cwd)) == NULL) fatal_f("getcwd: %s", 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_f("too many listen addresses"); 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 : "", 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) { #ifdef NET_RT_TABLE 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 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_f("missing host in %s", what); host = cleanhostname(host); if (arg == NULL || ((port = permitopen_port(arg)) < 0)) fatal_f("bad port number in %s", 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); } void process_channel_timeouts(struct ssh *ssh, ServerOptions *options) { int secs; u_int i; char *type; debug3_f("setting %u timeouts", options->num_channel_timeouts); channel_clear_timeouts(ssh); for (i = 0; i < options->num_channel_timeouts; i++) { if (parse_pattern_interval(options->channel_timeouts[i], &type, &secs) != 0) { fatal_f("internal error: bad timeout %s", options->channel_timeouts[i]); } channel_add_timeout(ssh, type, secs); free(type); } } struct connection_info * get_connection_info(struct ssh *ssh, int populate, int use_dns) { static struct connection_info ci; if (ssh == NULL || !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; } __dead 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') { /* Terminate on comment */ if (*attrib == '#') { cp = NULL; /* mark all arguments consumed */ break; } arg = NULL; attributes++; /* Criterion "all" has no argument and must appear alone */ if (strcasecmp(attrib, "all") == 0) { if (attributes > 1 || ((arg = strdelim(&cp)) != NULL && *arg != '\0' && *arg != '#')) { error("'all' cannot be combined with other " "Match attributes"); return -1; } if (arg != NULL && *arg == '#') cp = NULL; /* mark all arguments consumed */ *condition = cp; return 1; } /* All other criteria require an argument */ if ((arg = strdelim(&cp)) == NULL || *arg == '\0' || *arg == '#') { error("Missing Match criteria for %s", attrib); return -1; } if (strcasecmp(attrib, "user") == 0) { if (ci == NULL || (ci->test && ci->user == NULL)) { result = 0; continue; } if (ci->user == NULL) match_test_missing_fatal("User", "user"); if (match_usergroup_pattern_list(ci->user, arg) != 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 || (ci->test && ci->user == 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 || (ci->test && ci->host == 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 || (ci->test && ci->address == NULL)) { if (addr_match_list(NULL, arg) != 0) fatal("Invalid Match address argument " "'%s' at line %d", arg, line); 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 || (ci->test && ci->laddress == NULL)) { if (addr_match_list(NULL, arg) != 0) fatal("Invalid Match localaddress " "argument '%s' at line %d", arg, line); 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 || (ci->test && ci->lport == -1)) { 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->test && ci->rdomain == NULL)) { result = 0; continue; } if (ci->rdomain == NULL) match_test_missing_fatal("RDomain", "rdomain"); 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 { const char *key; int value; }; static const struct multistate multistate_flag[] = { { "yes", 1 }, { "no", 0 }, { NULL, -1 } }; static const struct multistate multistate_ignore_rhosts[] = { { "yes", IGNORE_RHOSTS_YES }, { "no", IGNORE_RHOSTS_NO }, { "shosts-only", IGNORE_RHOSTS_SHOSTS }, { 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[] = { #ifdef WITH_ZLIB { "yes", COMP_DELAYED }, { "delayed", COMP_DELAYED }, #endif { "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 } }; static int process_server_config_line_depth(ServerOptions *options, char *line, const char *filename, int linenum, int *activep, struct connection_info *connectinfo, int *inc_flags, int depth, struct include_list *includes) { char *str, ***chararrayptr, **charptr, *arg, *arg2, *p, *keyword; int cmdline = 0, *intptr, value, value2, n, port, oactive, r, found; int ca_only = 0; SyslogFacility *log_facility_ptr; LogLevel *log_level_ptr; #ifdef WITH_LDAP_PUBKEY unsigned long lvalue; #endif time_t *timetptr __unused; ServerOpCodes opcode; u_int i, *uintptr, uvalue, flags = 0; size_t len; long long val64; const struct multistate *multistate_ptr; const char *errstr; struct include_item *item; glob_t gbuf; char **oav = NULL, **av; int oac = 0, ac; int ret = -1; /* 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'; } str = line; if ((keyword = strdelim(&str)) == NULL) return 0; /* Ignore leading whitespace */ if (*keyword == '\0') keyword = strdelim(&str); if (!keyword || !*keyword || *keyword == '#') return 0; if (str == NULL || *str == '\0') { error("%s line %d: no argument after keyword \"%s\"", filename, linenum, keyword); return -1; } intptr = NULL; timetptr = NULL; charptr = NULL; opcode = parse_token(keyword, filename, linenum, &flags); if (argv_split(str, &oac, &oav, 1) != 0) { error("%s line %d: invalid quotes", filename, linenum); return -1; } ac = oac; av = oav; if (activep == NULL) { /* We are processing a command line directive */ cmdline = 1; activep = &cmdline; } if (*activep && opcode != sMatch && opcode != sInclude) debug3("%s:%d setting %s %s", filename, linenum, keyword, str); if (*activep == 0 && !(flags & SSHCFG_MATCH)) { if (connectinfo == NULL) { fatal("%s line %d: Directive '%s' is not allowed " "within a Match block", filename, linenum, keyword); } else { /* this is a directive we have already processed */ ret = 0; goto out; } } switch (opcode) { /* Portable-specific options */ case sUsePAM: intptr = &options->use_pam; goto parse_flag; /* Standard Options */ case sBadOption: goto out; case sPort: /* ignore ports from configfile if cmdline specifies ports */ if (options->ports_from_cmdline) { argv_consume(&ac); break; } if (options->num_ports >= MAX_PORTS) fatal("%s line %d: too many ports.", filename, linenum); arg = argv_next(&ac, &av); 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 = argv_next(&ac, &av); 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 = argv_next(&ac, &av); 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 { arg2 = NULL; 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 = argv_next(&ac, &av)) != NULL) { if (strcmp(arg, "rdomain") != 0 || (arg2 = argv_next(&ac, &av)) == 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 = argv_next(&ac, &av); 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 = argv_next(&ac, &av); if (!arg || *arg == '\0') fatal("%s line %d: missing file name.", filename, linenum); if (*activep) { servconf_add_hostkey(filename, linenum, options, arg, 1); } break; case sHostKeyAgent: charptr = &options->host_key_agent; arg = argv_next(&ac, &av); 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 = argv_next(&ac, &av); 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 = argv_next(&ac, &av); 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 sModuliFile: charptr = &options->moduli_file; goto parse_filename; case sPermitRootLogin: intptr = &options->permit_root_login; multistate_ptr = multistate_permitrootlogin; goto parse_multistate; case sIgnoreRhosts: intptr = &options->ignore_rhosts; multistate_ptr = multistate_ignore_rhosts; goto parse_multistate; case sIgnoreRootRhosts: intptr = &options->ignore_root_rhosts; goto parse_flag; case sNoneEnabled: intptr = &options->none_enabled; goto parse_flag; case sTcpRcvBufPoll: intptr = &options->tcp_rcv_buf_poll; goto parse_flag; case sHPNDisabled: intptr = &options->hpn_disabled; goto parse_flag; case sHPNBufferSize: intptr = &options->hpn_buffer_size; goto parse_int; case sIgnoreUserKnownHosts: intptr = &options->ignore_user_known_hosts; parse_flag: multistate_ptr = multistate_flag; goto parse_multistate; case sHostbasedAuthentication: intptr = &options->hostbased_authentication; goto parse_flag; case sHostbasedUsesNameFromPacketOnly: intptr = &options->hostbased_uses_name_from_packet_only; goto parse_flag; case sHostbasedAcceptedAlgorithms: charptr = &options->hostbased_accepted_algos; ca_only = 0; parse_pubkey_algos: arg = argv_next(&ac, &av); if (!arg || *arg == '\0') fatal("%s line %d: Missing argument.", filename, linenum); if (*arg != '-' && !sshkey_names_valid2(*arg == '+' || *arg == '^' ? arg + 1 : arg, 1, ca_only)) fatal("%s line %d: Bad key types '%s'.", filename, linenum, arg ? arg : ""); if (*activep && *charptr == NULL) *charptr = xstrdup(arg); break; case sHostKeyAlgorithms: charptr = &options->hostkeyalgorithms; ca_only = 0; goto parse_pubkey_algos; case sCASignatureAlgorithms: charptr = &options->ca_sign_algorithms; ca_only = 1; goto parse_pubkey_algos; case sPubkeyAuthentication: intptr = &options->pubkey_authentication; ca_only = 0; goto parse_flag; case sPubkeyAcceptedAlgorithms: charptr = &options->pubkey_accepted_algos; ca_only = 0; goto parse_pubkey_algos; case sPubkeyAuthOptions: intptr = &options->pubkey_auth_options; value = 0; while ((arg = argv_next(&ac, &av)) != NULL) { if (strcasecmp(arg, "none") == 0) continue; if (strcasecmp(arg, "touch-required") == 0) value |= PUBKEYAUTH_TOUCH_REQUIRED; else if (strcasecmp(arg, "verify-required") == 0) value |= PUBKEYAUTH_VERIFY_REQUIRED; else { error("%s line %d: unsupported %s option %s", filename, linenum, keyword, arg); goto out; } } if (*activep && *intptr == -1) *intptr = value; break; 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 sKerberosTgtPassing: intptr = &options->kerberos_tgt_passing; 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 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 = argv_next(&ac, &av); if ((errstr = atoi_err(arg, &value)) != NULL) fatal("%s line %d: %s integer value %s.", filename, linenum, keyword, 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_allowlist; arg = argv_next(&ac, &av); if (!arg || *arg == '\0') fatal("%s line %d: %s missing argument.", filename, linenum, keyword); 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 = argv_next(&ac, &av); if (!arg || *arg == '\0') fatal("%s line %d: %s missing argument.", filename, linenum, keyword); if (strcmp(arg, "default") == 0) { val64 = 0; } else { if (scan_scaled(arg, &val64) == -1) fatal("%.200s line %d: Bad %s number '%s': %s", filename, linenum, keyword, arg, strerror(errno)); if (val64 != 0 && val64 < 16) fatal("%.200s line %d: %s too small", filename, linenum, keyword); } if (*activep && options->rekey_limit == -1) options->rekey_limit = val64; if (ac != 0) { /* optional rekey interval present */ if (strcmp(av[0], "none") == 0) { (void)argv_next(&ac, &av); /* 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 = argv_next(&ac, &av); value = log_facility_number(arg); if (value == SYSLOG_FACILITY_NOT_SET) fatal("%.200s line %d: unsupported log facility '%s'", filename, linenum, arg ? arg : ""); if (*log_facility_ptr == -1) *log_facility_ptr = (SyslogFacility) value; break; case sLogLevel: log_level_ptr = &options->log_level; arg = argv_next(&ac, &av); value = log_level_number(arg); if (value == SYSLOG_LEVEL_NOT_SET) fatal("%.200s line %d: unsupported log level '%s'", filename, linenum, arg ? arg : ""); if (*activep && *log_level_ptr == -1) *log_level_ptr = (LogLevel) value; break; case sLogVerbose: found = options->num_log_verbose == 0; i = 0; while ((arg = argv_next(&ac, &av)) != NULL) { if (*arg == '\0') { error("%s line %d: keyword %s empty argument", filename, linenum, keyword); goto out; } /* Allow "none" only in first position */ if (strcasecmp(arg, "none") == 0) { if (i > 0 || ac > 0) { error("%s line %d: keyword %s \"none\" " "argument must appear alone.", filename, linenum, keyword); goto out; } } i++; if (!found || !*activep) continue; opt_array_append(filename, linenum, keyword, &options->log_verbose, &options->num_log_verbose, arg); } 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: chararrayptr = &options->allow_users; uintptr = &options->num_allow_users; parse_allowdenyusers: while ((arg = argv_next(&ac, &av)) != NULL) { if (*arg == '\0' || match_user(NULL, NULL, NULL, arg) == -1) fatal("%s line %d: invalid %s pattern: \"%s\"", filename, linenum, keyword, arg); if (!*activep) continue; opt_array_append(filename, linenum, keyword, chararrayptr, uintptr, arg); } break; case sDenyUsers: chararrayptr = &options->deny_users; uintptr = &options->num_deny_users; goto parse_allowdenyusers; case sAllowGroups: chararrayptr = &options->allow_groups; uintptr = &options->num_allow_groups; parse_allowdenygroups: while ((arg = argv_next(&ac, &av)) != NULL) { if (*arg == '\0') fatal("%s line %d: empty %s pattern", filename, linenum, keyword); if (!*activep) continue; opt_array_append(filename, linenum, keyword, chararrayptr, uintptr, arg); } break; case sDenyGroups: chararrayptr = &options->deny_groups; uintptr = &options->num_deny_groups; goto parse_allowdenygroups; case sCiphers: arg = argv_next(&ac, &av); if (!arg || *arg == '\0') fatal("%s line %d: %s missing argument.", filename, linenum, keyword); if (*arg != '-' && !ciphers_valid(*arg == '+' || *arg == '^' ? arg + 1 : arg)) fatal("%s line %d: Bad SSH2 cipher spec '%s'.", filename, linenum, arg ? arg : ""); if (options->ciphers == NULL) options->ciphers = xstrdup(arg); break; case sMacs: arg = argv_next(&ac, &av); if (!arg || *arg == '\0') fatal("%s line %d: %s missing argument.", filename, linenum, keyword); if (*arg != '-' && !mac_valid(*arg == '+' || *arg == '^' ? arg + 1 : arg)) fatal("%s line %d: Bad SSH2 mac spec '%s'.", filename, linenum, arg ? arg : ""); if (options->macs == NULL) options->macs = xstrdup(arg); break; case sKexAlgorithms: arg = argv_next(&ac, &av); if (!arg || *arg == '\0') fatal("%s line %d: %s missing argument.", filename, linenum, keyword); if (*arg != '-' && !kex_names_valid(*arg == '+' || *arg == '^' ? arg + 1 : arg)) fatal("%s line %d: Bad SSH2 KexAlgorithms '%s'.", filename, linenum, arg ? arg : ""); if (options->kex_algorithms == NULL) options->kex_algorithms = xstrdup(arg); break; case sSubsystem: arg = argv_next(&ac, &av); if (!arg || *arg == '\0') fatal("%s line %d: %s missing argument.", filename, linenum, keyword); if (!*activep) { argv_consume(&ac); break; } found = 0; for (i = 0; i < options->num_subsystems; i++) { if (strcmp(arg, options->subsystem_name[i]) == 0) { found = 1; break; } } if (found) { debug("%s line %d: Subsystem '%s' already defined.", filename, linenum, arg); argv_consume(&ac); break; } options->subsystem_name = xrecallocarray( options->subsystem_name, options->num_subsystems, options->num_subsystems + 1, sizeof(*options->subsystem_name)); options->subsystem_command = xrecallocarray( options->subsystem_command, options->num_subsystems, options->num_subsystems + 1, sizeof(*options->subsystem_command)); options->subsystem_args = xrecallocarray( options->subsystem_args, options->num_subsystems, options->num_subsystems + 1, sizeof(*options->subsystem_args)); options->subsystem_name[options->num_subsystems] = xstrdup(arg); arg = argv_next(&ac, &av); 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) */ arg = argv_assemble(1, &arg); /* quote command correctly */ arg2 = argv_assemble(ac, av); /* rest of command */ xasprintf(&options->subsystem_args[options->num_subsystems], "%s %s", arg, arg2); free(arg2); argv_consume(&ac); options->num_subsystems++; break; case sMaxStartups: arg = argv_next(&ac, &av); if (!arg || *arg == '\0') fatal("%s line %d: %s missing argument.", filename, linenum, keyword); 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: Invalid %s spec.", filename, linenum, keyword); } else if (n != 1) fatal("%s line %d: Invalid %s spec.", filename, linenum, keyword); else options->max_startups = options->max_startups_begin; if (options->max_startups <= 0 || options->max_startups_begin <= 0) fatal("%s line %d: Invalid %s spec.", filename, linenum, keyword); break; case sPerSourceNetBlockSize: arg = argv_next(&ac, &av); if (!arg || *arg == '\0') fatal("%s line %d: %s missing argument.", filename, linenum, keyword); switch (n = sscanf(arg, "%d:%d", &value, &value2)) { case 2: if (value2 < 0 || value2 > 128) n = -1; /* FALLTHROUGH */ case 1: if (value < 0 || value > 32) n = -1; } if (n != 1 && n != 2) fatal("%s line %d: Invalid %s spec.", filename, linenum, keyword); if (*activep) { options->per_source_masklen_ipv4 = value; options->per_source_masklen_ipv6 = value2; } break; case sPerSourceMaxStartups: arg = argv_next(&ac, &av); if (!arg || *arg == '\0') fatal("%s line %d: %s missing argument.", filename, linenum, keyword); if (strcmp(arg, "none") == 0) { /* no limit */ value = INT_MAX; } else { if ((errstr = atoi_err(arg, &value)) != NULL) fatal("%s line %d: %s integer value %s.", filename, linenum, keyword, errstr); } if (*activep && options->per_source_max_startups == -1) options->per_source_max_startups = value; 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: uvalue = options->num_authkeys_files; while ((arg = argv_next(&ac, &av)) != NULL) { if (*arg == '\0') { error("%s line %d: keyword %s empty argument", filename, linenum, keyword); goto out; } arg2 = tilde_expand_filename(arg, getuid()); if (*activep && uvalue == 0) { opt_array_append(filename, linenum, keyword, &options->authorized_keys_files, &options->num_authkeys_files, arg2); } free(arg2); } break; case sAuthorizedPrincipalsFile: charptr = &options->authorized_principals_file; arg = argv_next(&ac, &av); if (!arg || *arg == '\0') fatal("%s line %d: %s missing argument.", filename, linenum, keyword); 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 = argv_next(&ac, &av)) != NULL) { if (*arg == '\0' || strchr(arg, '=') != NULL) fatal("%s line %d: Invalid environment name.", filename, linenum); if (!*activep) continue; opt_array_append(filename, linenum, keyword, &options->accept_env, &options->num_accept_env, arg); } break; case sSetEnv: uvalue = options->num_setenv; while ((arg = argv_next(&ac, &av)) != NULL) { if (*arg == '\0' || strchr(arg, '=') == NULL) fatal("%s line %d: Invalid environment.", filename, linenum); if (!*activep || uvalue != 0) continue; if (lookup_setenv_in_list(arg, options->setenv, options->num_setenv) != NULL) { debug2("%s line %d: ignoring duplicate env " "name \"%.64s\"", filename, linenum, arg); continue; } opt_array_append(filename, linenum, keyword, &options->setenv, &options->num_setenv, arg); } break; case sPermitTunnel: intptr = &options->permit_tun; arg = argv_next(&ac, &av); if (!arg || *arg == '\0') fatal("%s line %d: %s missing argument.", filename, linenum, keyword); 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 %s argument %s", filename, linenum, keyword, arg); if (*activep && *intptr == -1) *intptr = value; break; case sInclude: if (cmdline) { fatal("Include directive not supported as a " "command-line option"); } value = 0; while ((arg2 = argv_next(&ac, &av)) != NULL) { if (*arg2 == '\0') { error("%s line %d: keyword %s empty argument", filename, linenum, keyword); goto out; } value++; found = 0; if (*arg2 != '/' && *arg2 != '~') { xasprintf(&arg, "%s/%s", SSHDIR, arg2); } else arg = xstrdup(arg2); /* * Don't let included files clobber the containing * file's Match state. */ oactive = *activep; /* consult cache of include files */ TAILQ_FOREACH(item, includes, entry) { if (strcmp(item->selector, arg) != 0) continue; if (item->filename != NULL) { parse_server_config_depth(options, item->filename, item->contents, includes, connectinfo, (*inc_flags & SSHCFG_MATCH_ONLY ? SSHCFG_MATCH_ONLY : (oactive ? 0 : SSHCFG_NEVERMATCH)), activep, depth + 1); } found = 1; *activep = oactive; } if (found != 0) { free(arg); continue; } /* requested glob was not in cache */ debug2("%s line %d: new include %s", filename, linenum, arg); if ((r = glob(arg, 0, NULL, &gbuf)) != 0) { if (r != GLOB_NOMATCH) { fatal("%s line %d: include \"%s\" glob " "failed", filename, linenum, arg); } /* * If no entry matched then record a * placeholder to skip later glob calls. */ debug2("%s line %d: no match for %s", filename, linenum, arg); item = xcalloc(1, sizeof(*item)); item->selector = strdup(arg); TAILQ_INSERT_TAIL(includes, item, entry); } if (gbuf.gl_pathc > INT_MAX) fatal_f("too many glob results"); for (n = 0; n < (int)gbuf.gl_pathc; n++) { debug2("%s line %d: including %s", filename, linenum, gbuf.gl_pathv[n]); item = xcalloc(1, sizeof(*item)); item->selector = strdup(arg); item->filename = strdup(gbuf.gl_pathv[n]); if ((item->contents = sshbuf_new()) == NULL) fatal_f("sshbuf_new failed"); load_server_config(item->filename, item->contents); parse_server_config_depth(options, item->filename, item->contents, includes, connectinfo, (*inc_flags & SSHCFG_MATCH_ONLY ? SSHCFG_MATCH_ONLY : (oactive ? 0 : SSHCFG_NEVERMATCH)), activep, depth + 1); *activep = oactive; TAILQ_INSERT_TAIL(includes, item, entry); } globfree(&gbuf); free(arg); } if (value == 0) { fatal("%s line %d: %s missing filename argument", filename, linenum, keyword); } break; case sMatch: if (cmdline) fatal("Match directive not supported as a command-line " "option"); value = match_cfg_line(&str, linenum, (*inc_flags & SSHCFG_NEVERMATCH ? NULL : connectinfo)); if (value < 0) fatal("%s line %d: Bad Match condition", filename, linenum); *activep = (*inc_flags & SSHCFG_NEVERMATCH) ? 0 : value; /* * The MATCH_ONLY flag is applicable only until the first * match block. */ *inc_flags &= ~SSHCFG_MATCH_ONLY; /* * If match_cfg_line() didn't consume all its arguments then * arrange for the extra arguments check below to fail. */ if (str == NULL || *str == '\0') argv_consume(&ac); 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 = argv_next(&ac, &av); if (!arg || *arg == '\0') fatal("%s line %d: %s missing argument.", filename, linenum, keyword); 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 = argv_next(&ac, &av)) { 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: %s missing host", filename, linenum, keyword); } p = cleanhostname(p); } if (arg == NULL || ((port = permitopen_port(arg)) < 0)) { fatal("%s line %d: %s bad port number", filename, linenum, keyword); } if (*activep && uvalue == 0) { opt_array_append(filename, linenum, keyword, chararrayptr, uintptr, arg2); } free(arg2); } break; case sForceCommand: if (str == NULL || *str == '\0') fatal("%s line %d: %s missing argument.", filename, linenum, keyword); len = strspn(str, WHITESPACE); if (*activep && options->adm_forced_command == NULL) options->adm_forced_command = xstrdup(str + len); argv_consume(&ac); break; case sChrootDirectory: charptr = &options->chroot_directory; arg = argv_next(&ac, &av); if (!arg || *arg == '\0') fatal("%s line %d: %s missing argument.", filename, linenum, keyword); 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 sSecurityKeyProvider: charptr = &options->sk_provider; arg = argv_next(&ac, &av); if (!arg || *arg == '\0') fatal("%s line %d: %s missing argument.", filename, linenum, keyword); if (*activep && *charptr == NULL) { *charptr = strcasecmp(arg, "internal") == 0 ? xstrdup(arg) : derelativise_path(arg); /* increase optional counter */ if (intptr != NULL) *intptr = *intptr + 1; } break; case sIPQoS: arg = argv_next(&ac, &av); if (!arg || *arg == '\0') fatal("%s line %d: %s missing argument.", filename, linenum, keyword); if ((value = parse_ipqos(arg)) == -1) fatal("%s line %d: Bad %s value: %s", filename, linenum, keyword, arg); arg = argv_next(&ac, &av); if (arg == NULL) value2 = value; else if ((value2 = parse_ipqos(arg)) == -1) fatal("%s line %d: Bad %s value: %s", filename, linenum, keyword, arg); if (*activep) { options->ip_qos_interactive = value; options->ip_qos_bulk = value2; } break; case sVersionAddendum: if (str == NULL || *str == '\0') fatal("%s line %d: %s missing argument.", filename, linenum, keyword); len = strspn(str, WHITESPACE); if (strchr(str + len, '\r') != NULL) { fatal("%.200s line %d: Invalid %s argument", filename, linenum, keyword); } if ((arg = strchr(line, '#')) != NULL) { *arg = '\0'; rtrim(line); } if (*activep && options->version_addendum == NULL) { if (strcasecmp(str + len, "none") == 0) options->version_addendum = xstrdup(""); else options->version_addendum = xstrdup(str + len); } argv_consume(&ac); break; case sAuthorizedKeysCommand: charptr = &options->authorized_keys_command; parse_command: len = strspn(str, WHITESPACE); if (str[len] != '/' && strcasecmp(str + len, "none") != 0) { fatal("%.200s line %d: %s must be an absolute path", filename, linenum, keyword); } if (*activep && *charptr == NULL) *charptr = xstrdup(str + len); argv_consume(&ac); break; case sAuthorizedKeysCommandUser: charptr = &options->authorized_keys_command_user; parse_localuser: arg = argv_next(&ac, &av); if (!arg || *arg == '\0') { fatal("%s line %d: missing %s argument.", filename, linenum, keyword); } if (*activep && *charptr == NULL) *charptr = xstrdup(arg); break; case sAuthorizedPrincipalsCommand: charptr = &options->authorized_principals_command; goto parse_command; case sAuthorizedPrincipalsCommandUser: charptr = &options->authorized_principals_command_user; goto parse_localuser; case sAuthenticationMethods: found = options->num_auth_methods == 0; value = 0; /* seen "any" pseudo-method */ value2 = 0; /* successfully parsed any method */ while ((arg = argv_next(&ac, &av)) != NULL) { if (strcmp(arg, "any") == 0) { if (options->num_auth_methods > 0) { fatal("%s line %d: \"any\" must " "appear alone in %s", filename, linenum, keyword); } value = 1; } else if (value) { fatal("%s line %d: \"any\" must appear " "alone in %s", filename, linenum, keyword); } else if (auth2_methods_valid(arg, 0) != 0) { fatal("%s line %d: invalid %s method list.", filename, linenum, keyword); } value2 = 1; if (!found || !*activep) continue; opt_array_append(filename, linenum, keyword, &options->auth_methods, &options->num_auth_methods, arg); } if (value2 == 0) { fatal("%s line %d: no %s specified", filename, linenum, keyword); } break; case sStreamLocalBindMask: arg = argv_next(&ac, &av); if (!arg || *arg == '\0') fatal("%s line %d: %s missing argument.", filename, linenum, keyword); /* Parse mode in octal format */ value = strtol(arg, &p, 8); if (arg == p || value < 0 || value > 0777) fatal("%s line %d: Invalid %s.", filename, linenum, keyword); 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 = argv_next(&ac, &av); if (!arg || *arg == '\0') fatal("%s line %d: %s missing argument.", filename, linenum, keyword); if ((value = ssh_digest_alg_by_name(arg)) == -1) fatal("%.200s line %d: Invalid %s algorithm \"%s\".", filename, linenum, keyword, 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 = argv_next(&ac, &av); if (!arg || *arg == '\0') fatal("%s line %d: %s missing argument.", filename, linenum, keyword); if (strcasecmp(arg, "none") != 0 && strcmp(arg, "%D") != 0 && !valid_rdomain(arg)) fatal("%s line %d: invalid routing domain", filename, linenum); if (*activep && *charptr == NULL) *charptr = xstrdup(arg); break; case sRequiredRSASize: intptr = &options->required_rsa_size; goto parse_int; case sChannelTimeout: uvalue = options->num_channel_timeouts; i = 0; while ((arg = argv_next(&ac, &av)) != NULL) { /* Allow "none" only in first position */ if (strcasecmp(arg, "none") == 0) { if (i > 0 || ac > 0) { error("%s line %d: keyword %s \"none\" " "argument must appear alone.", filename, linenum, keyword); goto out; } } else if (parse_pattern_interval(arg, NULL, NULL) != 0) { fatal("%s line %d: invalid channel timeout %s", filename, linenum, arg); } if (!*activep || uvalue != 0) continue; opt_array_append(filename, linenum, keyword, &options->channel_timeouts, &options->num_channel_timeouts, arg); } break; case sUnusedConnectionTimeout: intptr = &options->unused_connection_timeout; /* peek at first arg for "none" so we can reuse parse_time */ if (av[0] != NULL && strcasecmp(av[0], "none") == 0) { (void)argv_next(&ac, &av); /* consume arg */ if (*activep) *intptr = 0; break; } goto parse_time; 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", keyword); argv_consume(&ac); break; #ifdef WITH_LDAP_PUBKEY case sLdapPublickey: intptr = &options->lpk.on; goto parse_flag; case sLdapServers: /* arg = strdelim(&cp); */ p = line; while(*p++); arg = p; if (!arg || *arg == '\0') fatal("%s line %d: missing ldap server",filename,linenum); arg[strlen(arg)] = '\0'; if ((options->lpk.servers = ldap_parse_servers(arg)) == NULL) fatal("%s line %d: error in ldap servers", filename, linenum); memset(arg,0,strlen(arg)); break; case sLdapUserDN: arg = argv_next(&ac, &av); if (!arg || *arg == '\0') fatal("%s line %d: missing ldap server",filename,linenum); arg[strlen(arg)] = '\0'; options->lpk.u_basedn = xstrdup(arg); memset(arg,0,strlen(arg)); break; case sLdapGroupDN: arg = argv_next(&ac, &av); if (!arg || *arg == '\0') fatal("%s line %d: missing ldap server",filename,linenum); arg[strlen(arg)] = '\0'; options->lpk.g_basedn = xstrdup(arg); memset(arg,0,strlen(arg)); break; case sBindDN: arg = argv_next(&ac, &av); if (!arg || *arg == '\0') fatal("%s line %d: missing binddn",filename,linenum); arg[strlen(arg)] = '\0'; options->lpk.binddn = xstrdup(arg); memset(arg,0,strlen(arg)); break; case sBindPw: arg = argv_next(&ac, &av); if (!arg || *arg == '\0') fatal("%s line %d: missing bindpw",filename,linenum); arg[strlen(arg)] = '\0'; options->lpk.bindpw = xstrdup(arg); memset(arg,0,strlen(arg)); break; case sMyGroup: arg = argv_next(&ac, &av); if (!arg || *arg == '\0') fatal("%s line %d: missing groupname",filename, linenum); arg[strlen(arg)] = '\0'; options->lpk.sgroup = xstrdup(arg); if (options->lpk.sgroup) options->lpk.fgroup = ldap_parse_groups(options->lpk.sgroup); memset(arg,0,strlen(arg)); break; case sLdapFilter: arg = argv_next(&ac, &av); if (!arg || *arg == '\0') fatal("%s line %d: missing filter",filename, linenum); arg[strlen(arg)] = '\0'; options->lpk.filter = xstrdup(arg); memset(arg,0,strlen(arg)); break; case sForceTLS: intptr = &options->lpk.tls; arg = argv_next(&ac, &av); if (!arg || *arg == '\0') fatal("%s line %d: missing yes/no argument.", filename, linenum); value = 0; /* silence compiler */ if (strcmp(arg, "yes") == 0) value = 1; else if (strcmp(arg, "no") == 0) value = 0; else if (strcmp(arg, "try") == 0) value = -1; else fatal("%s line %d: Bad yes/no argument: %s", filename, linenum, arg); if (*intptr == -1) *intptr = value; break; case sBindTimeout: timetptr = &options->lpk.b_timeout.tv_sec; parse_ulong: arg = argv_next(&ac, &av); if (!arg || *arg == '\0') fatal("%s line %d: missing integer value.", filename, linenum); lvalue = atol(arg); if (*activep && *timetptr == -1) *timetptr = lvalue; break; case sSearchTimeout: timetptr = &options->lpk.s_timeout.tv_sec; goto parse_ulong; break; case sLdapConf: arg = argv_next(&ac, &av); if (!arg || *arg == '\0') fatal("%s line %d: missing LpkLdapConf", filename, linenum); arg[strlen(arg)] = '\0'; options->lpk.l_conf = xstrdup(arg); memset(arg, 0, strlen(arg)); break; case sLpkPubKeyAttr: arg = argv_next(&ac, &av); if (!arg || *arg == '\0') fatal("%s line %d: missing pubkeyattr",filename,linenum); arg[strlen(arg)] = '\0'; options->lpk.pub_key_attr = xstrdup(arg); memset(arg,0,strlen(arg)); break; #endif default: fatal("%s line %d: Missing handler for opcode %s (%d)", filename, linenum, keyword, opcode); } /* Check that there is no garbage at end of line. */ if (ac > 0) { error("%.200s line %d: keyword %s extra arguments " "at end of line", filename, linenum, keyword); goto out; } /* success */ ret = 0; out: argv_free(oav, oac); return ret; } int process_server_config_line(ServerOptions *options, char *line, const char *filename, int linenum, int *activep, struct connection_info *connectinfo, struct include_list *includes) { int inc_flags = 0; return process_server_config_line_depth(options, line, filename, linenum, activep, connectinfo, &inc_flags, 0, includes); } /* Reads the server configuration file. */ void load_server_config(const char *filename, struct sshbuf *conf) { struct stat st; char *line = NULL, *cp; size_t linesize = 0; FILE *f; int r; debug2_f("filename %s", filename); if ((f = fopen(filename, "r")) == NULL) { perror(filename); exit(1); } sshbuf_reset(conf); /* grow buffer, so realloc is avoided for large config files */ if (fstat(fileno(f), &st) == 0 && st.st_size > 0 && (r = sshbuf_allocate(conf, st.st_size)) != 0) fatal_fr(r, "allocate"); while (getline(&line, &linesize, f) != -1) { /* * Strip whitespace * NB - preserve newlines, they are needed to reproduce * line numbers later for error messages */ cp = line + strspn(line, " \t\r"); if ((r = sshbuf_put(conf, cp, strlen(cp))) != 0) fatal_fr(r, "sshbuf_put"); } free(line); if ((r = sshbuf_put_u8(conf, 0)) != 0) fatal_fr(r, "sshbuf_put_u8"); fclose(f); debug2_f("done config len = %zu", sshbuf_len(conf)); } void parse_server_match_config(ServerOptions *options, struct include_list *includes, struct connection_info *connectinfo) { ServerOptions mo; initialize_server_options(&mo); parse_server_config(&mo, "reprocess config", cfg, includes, connectinfo, 0); 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; } void servconf_merge_subsystems(ServerOptions *dst, ServerOptions *src) { u_int i, j, found; for (i = 0; i < src->num_subsystems; i++) { found = 0; for (j = 0; j < dst->num_subsystems; j++) { if (strcmp(src->subsystem_name[i], dst->subsystem_name[j]) == 0) { found = 1; break; } } if (found) { debug_f("override \"%s\"", dst->subsystem_name[j]); free(dst->subsystem_command[j]); free(dst->subsystem_args[j]); dst->subsystem_command[j] = xstrdup(src->subsystem_command[i]); dst->subsystem_args[j] = xstrdup(src->subsystem_args[i]); continue; } debug_f("add \"%s\"", src->subsystem_name[i]); dst->subsystem_name = xrecallocarray( dst->subsystem_name, dst->num_subsystems, dst->num_subsystems + 1, sizeof(*dst->subsystem_name)); dst->subsystem_command = xrecallocarray( dst->subsystem_command, dst->num_subsystems, dst->num_subsystems + 1, sizeof(*dst->subsystem_command)); dst->subsystem_args = xrecallocarray( dst->subsystem_args, dst->num_subsystems, dst->num_subsystems + 1, sizeof(*dst->subsystem_args)); j = dst->num_subsystems++; dst->subsystem_name[j] = xstrdup(src->subsystem_name[i]); dst->subsystem_command[j] = xstrdup(src->subsystem_command[i]); dst->subsystem_args[j] = xstrdup(src->subsystem_args[i]); } } /* * 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(pubkey_auth_options); 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(ignore_rhosts); 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); M_CP_INTOPT(required_rsa_size); M_CP_INTOPT(unused_connection_timeout); /* * 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; } /* Subsystems require merging. */ servconf_merge_subsystems(dst, src); } #undef M_CP_INTOPT #undef M_CP_STROPT #undef M_CP_STRARRAYOPT #define SERVCONF_MAX_DEPTH 16 static void parse_server_config_depth(ServerOptions *options, const char *filename, struct sshbuf *conf, struct include_list *includes, struct connection_info *connectinfo, int flags, int *activep, int depth) { int linenum, bad_options = 0; char *cp, *obuf, *cbuf; if (depth < 0 || depth > SERVCONF_MAX_DEPTH) fatal("Too many recursive configuration includes"); debug2_f("config %s len %zu%s", filename, sshbuf_len(conf), (flags & SSHCFG_NEVERMATCH ? " [checking syntax only]" : "")); if ((obuf = cbuf = sshbuf_dup_string(conf)) == NULL) fatal_f("sshbuf_dup_string failed"); linenum = 1; while ((cp = strsep(&cbuf, "\n")) != NULL) { if (process_server_config_line_depth(options, cp, filename, linenum++, activep, connectinfo, &flags, depth, includes) != 0) bad_options++; } free(obuf); if (bad_options > 0) fatal("%s: terminating, %d bad configuration options", filename, bad_options); } void parse_server_config(ServerOptions *options, const char *filename, struct sshbuf *conf, struct include_list *includes, struct connection_info *connectinfo, int reexec) { int active = connectinfo ? 0 : 1; parse_server_config_depth(options, filename, conf, includes, connectinfo, (connectinfo ? SSHCFG_MATCH_ONLY : 0), &active, 0); if (!reexec) 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 sIgnoreRhosts: return fmt_multistate_int(val, multistate_ignore_rhosts); 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) { if (code == sUnusedConnectionTimeout && val == 0) { printf("%s none\n", lookup_opcode_name(code)); return; } 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; switch (code) { case sAuthenticationMethods: case sChannelTimeout: break; default: if (count <= 0) return; break; } printf("%s", lookup_opcode_name(code)); for (i = 0; i < count; i++) printf(" %s", vals[i]); if (code == sAuthenticationMethods && count == 0) printf(" any"); else if (code == sChannelTimeout && count == 0) printf(" none"); 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) { const 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++) { char *ss = format_listen_addrs(&o->listen_addrs[i]); printf("%s", ss); free(ss); } /* integer arguments */ 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_int(sRequiredRSASize, o->required_rsa_size); dump_cfg_oct(sStreamLocalBindMask, o->fwd_opts.streamlocal_bind_mask); dump_cfg_int(sUnusedConnectionTimeout, o->unused_connection_timeout); /* 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); dump_cfg_fmtint(sKerberosGetAFSToken, o->kerberos_get_afs_token); #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(sPrintMotd, o->print_motd); dump_cfg_fmtint(sPrintLastLog, o->print_lastlog); 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(sModuliFile, o->moduli_file); dump_cfg_string(sXAuthLocation, o->xauth_location); dump_cfg_string(sCiphers, o->ciphers); dump_cfg_string(sMacs, o->macs); 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(sSecurityKeyProvider, o->sk_provider); 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); dump_cfg_string(sCASignatureAlgorithms, o->ca_sign_algorithms); dump_cfg_string(sHostbasedAcceptedAlgorithms, o->hostbased_accepted_algos); dump_cfg_string(sHostKeyAlgorithms, o->hostkeyalgorithms); dump_cfg_string(sPubkeyAcceptedAlgorithms, o->pubkey_accepted_algos); 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); dump_cfg_strarray_oneline(sLogVerbose, o->num_log_verbose, o->log_verbose); dump_cfg_strarray_oneline(sChannelTimeout, o->num_channel_timeouts, o->channel_timeouts); /* 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); printf("persourcemaxstartups "); if (o->per_source_max_startups == INT_MAX) printf("none\n"); else printf("%d\n", o->per_source_max_startups); printf("persourcenetblocksize %d:%d\n", o->per_source_masklen_ipv4, o->per_source_masklen_ipv6); 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_allowlist == NULL) { dump_cfg_fmtint(sPermitUserEnvironment, o->permit_user_env); } else { printf("permituserenvironment %s\n", o->permit_user_env_allowlist); } printf("pubkeyauthoptions"); if (o->pubkey_auth_options == 0) printf(" none"); if (o->pubkey_auth_options & PUBKEYAUTH_TOUCH_REQUIRED) printf(" touch-required"); if (o->pubkey_auth_options & PUBKEYAUTH_VERIFY_REQUIRED) printf(" verify-required"); printf("\n"); }