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+
+/* $OpenBSD: servconf.c,v 1.369 2020/08/28 03:15:52 dtucker Exp $ */
+/*
+ * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
+ * All rights reserved
+ *
+ * As far as I am concerned, the code I have written for this software
+ * can be used freely for any purpose. Any derived versions of this
+ * software must be clearly marked as such, and if the derived work is
+ * incompatible with the protocol description in the RFC file, it must be
+ * called by a name other than "ssh" or "Secure Shell".
+ */
+
+#include "includes.h"
+
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <sys/stat.h>
+#ifdef __OpenBSD__
+#include <sys/sysctl.h>
+#endif
+
+#include <netinet/in.h>
+#include <netinet/in_systm.h>
+#include <netinet/ip.h>
+#ifdef HAVE_NET_ROUTE_H
+#include <net/route.h>
+#endif
+
+#include <ctype.h>
+#include <netdb.h>
+#include <pwd.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <signal.h>
+#include <unistd.h>
+#include <limits.h>
+#include <stdarg.h>
+#include <errno.h>
+#ifdef HAVE_UTIL_H
+#include <util.h>
+#endif
+#ifdef USE_SYSTEM_GLOB
+# include <glob.h>
+#else
+# include "openbsd-compat/glob.h"
+#endif
+
+#include "openbsd-compat/sys-queue.h"
+#include "xmalloc.h"
+#include "ssh.h"
+#include "log.h"
+#include "sshbuf.h"
+#include "misc.h"
+#include "servconf.h"
+#include "compat.h"
+#include "pathnames.h"
+#include "cipher.h"
+#include "sshkey.h"
+#include "kex.h"
+#include "mac.h"
+#include "match.h"
+#include "channels.h"
+#include "groupaccess.h"
+#include "canohost.h"
+#include "packet.h"
+#include "ssherr.h"
+#include "hostfile.h"
+#include "auth.h"
+#include "myproposal.h"
+#include "digest.h"
+
+static void add_listen_addr(ServerOptions *, const char *,
+ const char *, int);
+static void add_one_listen_addr(ServerOptions *, const char *,
+ const char *, int);
+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_user_known_hosts = -1;
+ options->print_motd = -1;
+ options->print_lastlog = -1;
+ options->x11_forwarding = -1;
+ options->x11_display_offset = -1;
+ options->x11_use_localhost = -1;
+ options->permit_tty = -1;
+ options->permit_user_rc = -1;
+ options->xauth_location = NULL;
+ options->strict_modes = -1;
+ options->tcp_keep_alive = -1;
+ options->log_facility = SYSLOG_FACILITY_NOT_SET;
+ options->log_level = SYSLOG_LEVEL_NOT_SET;
+ options->hostbased_authentication = -1;
+ options->hostbased_uses_name_from_packet_only = -1;
+ options->hostbased_key_types = NULL;
+ options->hostkeyalgorithms = NULL;
+ options->pubkey_authentication = -1;
+ options->pubkey_auth_options = -1;
+ options->pubkey_key_types = NULL;
+ options->kerberos_authentication = -1;
+ options->kerberos_or_local_passwd = -1;
+ options->kerberos_ticket_cleanup = -1;
+ options->kerberos_get_afs_token = -1;
+ options->gss_authentication=-1;
+ options->gss_cleanup_creds = -1;
+ options->gss_strict_acceptor = -1;
+ options->password_authentication = -1;
+ options->kbd_interactive_authentication = -1;
+ options->challenge_response_authentication = -1;
+ options->permit_empty_passwd = -1;
+ options->permit_user_env = -1;
+ options->permit_user_env_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;
+ options->macs = NULL;
+ options->kex_algorithms = NULL;
+ options->ca_sign_algorithms = NULL;
+ options->fwd_opts.gateway_ports = -1;
+ options->fwd_opts.streamlocal_bind_mask = (mode_t)-1;
+ options->fwd_opts.streamlocal_bind_unlink = -1;
+ options->num_subsystems = 0;
+ options->max_startups_begin = -1;
+ options->max_startups_rate = -1;
+ options->max_startups = -1;
+ options->max_authtries = -1;
+ options->max_sessions = -1;
+ options->banner = NULL;
+ options->use_dns = -1;
+ options->client_alive_interval = -1;
+ options->client_alive_count_max = -1;
+ options->num_authkeys_files = 0;
+ options->num_accept_env = 0;
+ options->num_setenv = 0;
+ options->permit_tun = -1;
+ options->permitted_opens = NULL;
+ options->permitted_listens = NULL;
+ options->adm_forced_command = NULL;
+ options->chroot_directory = NULL;
+ options->authorized_keys_command = NULL;
+ options->authorized_keys_command_user = NULL;
+ options->revoked_keys_file = NULL;
+ options->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;
+}
+
+/* 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("%s: %s: %s", __func__, #what, ssh_err(r)); \
+ } 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_key_types, def_key, all_key);
+ ASSEMBLE(pubkey_key_types, 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);
+}
+
+static void
+array_append2(const char *file, const int line, const char *directive,
+ char ***array, int **iarray, u_int *lp, const char *s, int i)
+{
+
+ if (*lp >= INT_MAX)
+ fatal("%s line %d: Too many %s entries", file, line, directive);
+
+ if (iarray != NULL) {
+ *iarray = xrecallocarray(*iarray, *lp, *lp + 1,
+ sizeof(**iarray));
+ (*iarray)[*lp] = i;
+ }
+
+ *array = xrecallocarray(*array, *lp, *lp + 1, sizeof(**array));
+ (*array)[*lp] = xstrdup(s);
+ (*lp)++;
+}
+
+static void
+array_append(const char *file, const int line, const char *directive,
+ char ***array, u_int *lp, const char *s)
+{
+ array_append2(file, line, directive, array, NULL, lp, s, 0);
+}
+
+void
+servconf_add_hostkey(const char *file, const int line,
+ ServerOptions *options, const char *path, int userprovided)
+{
+ char *apath = derelativise_path(path);
+
+ 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);
+
+ array_append(file, line, "HostCertificate",
+ &options->host_cert_files, &options->num_host_cert_files, apath);
+ free(apath);
+}
+
+void
+fill_default_server_options(ServerOptions *options)
+{
+ u_int i;
+
+ /* Portable-specific options */
+ if (options->use_pam == -1)
+ options->use_pam = 0;
+
+ /* Standard Options */
+ if (options->num_host_key_files == 0) {
+ /* fill default hostkeys for protocols */
+ servconf_add_hostkey("[default]", 0, options,
+ _PATH_HOST_RSA_KEY_FILE, 0);
+#ifdef OPENSSL_HAS_ECC
+ servconf_add_hostkey("[default]", 0, options,
+ _PATH_HOST_ECDSA_KEY_FILE, 0);
+#endif
+ 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->login_grace_time == -1)
+ options->login_grace_time = 120;
+ if (options->permit_root_login == PERMIT_NOT_SET)
+ options->permit_root_login = PERMIT_NO_PASSWD;
+ if (options->ignore_rhosts == -1)
+ options->ignore_rhosts = 1;
+ if (options->ignore_user_known_hosts == -1)
+ options->ignore_user_known_hosts = 0;
+ if (options->print_motd == -1)
+ options->print_motd = 1;
+ if (options->print_lastlog == -1)
+ options->print_lastlog = 1;
+ if (options->x11_forwarding == -1)
+ options->x11_forwarding = 0;
+ if (options->x11_display_offset == -1)
+ options->x11_display_offset = 10;
+ if (options->x11_use_localhost == -1)
+ options->x11_use_localhost = 1;
+ if (options->xauth_location == NULL)
+ options->xauth_location = xstrdup(_PATH_XAUTH);
+ if (options->permit_tty == -1)
+ options->permit_tty = 1;
+ if (options->permit_user_rc == -1)
+ options->permit_user_rc = 1;
+ if (options->strict_modes == -1)
+ options->strict_modes = 1;
+ if (options->tcp_keep_alive == -1)
+ options->tcp_keep_alive = 1;
+ if (options->log_facility == SYSLOG_FACILITY_NOT_SET)
+ options->log_facility = SYSLOG_FACILITY_AUTH;
+ if (options->log_level == SYSLOG_LEVEL_NOT_SET)
+ options->log_level = SYSLOG_LEVEL_INFO;
+ if (options->hostbased_authentication == -1)
+ options->hostbased_authentication = 0;
+ if (options->hostbased_uses_name_from_packet_only == -1)
+ options->hostbased_uses_name_from_packet_only = 0;
+ if (options->pubkey_authentication == -1)
+ options->pubkey_authentication = 1;
+ if (options->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 (options->kerberos_get_afs_token == -1)
+ options->kerberos_get_afs_token = 0;
+ if (options->gss_authentication == -1)
+ options->gss_authentication = 0;
+ if (options->gss_cleanup_creds == -1)
+ options->gss_cleanup_creds = 1;
+ if (options->gss_strict_acceptor == -1)
+ options->gss_strict_acceptor = 1;
+ if (options->password_authentication == -1)
+ options->password_authentication = 1;
+ if (options->kbd_interactive_authentication == -1)
+ options->kbd_interactive_authentication = 0;
+ if (options->challenge_response_authentication == -1)
+ options->challenge_response_authentication = 1;
+ if (options->permit_empty_passwd == -1)
+ options->permit_empty_passwd = 0;
+ if (options->permit_user_env == -1) {
+ options->permit_user_env = 0;
+ options->permit_user_env_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->max_authtries == -1)
+ options->max_authtries = DEFAULT_AUTH_FAIL_MAX;
+ if (options->max_sessions == -1)
+ options->max_sessions = DEFAULT_SESSIONS_MAX;
+ if (options->use_dns == -1)
+ options->use_dns = 0;
+ if (options->client_alive_interval == -1)
+ options->client_alive_interval = 0;
+ if (options->client_alive_count_max == -1)
+ options->client_alive_count_max = 3;
+ if (options->num_authkeys_files == 0) {
+ array_append("[default]", 0, "AuthorizedKeysFiles",
+ &options->authorized_keys_files,
+ &options->num_authkeys_files,
+ _PATH_SSH_USER_PERMITTED_KEYS);
+ array_append("[default]", 0, "AuthorizedKeysFiles",
+ &options->authorized_keys_files,
+ &options->num_authkeys_files,
+ _PATH_SSH_USER_PERMITTED_KEYS2);
+ }
+ if (options->permit_tun == -1)
+ options->permit_tun = SSH_TUNMODE_NO;
+ if (options->ip_qos_interactive == -1)
+ options->ip_qos_interactive = IPTOS_DSCP_AF21;
+ if (options->ip_qos_bulk == -1)
+ options->ip_qos_bulk = IPTOS_DSCP_CS1;
+ if (options->version_addendum == NULL)
+ options->version_addendum = xstrdup("");
+ if (options->fwd_opts.streamlocal_bind_mask == (mode_t)-1)
+ options->fwd_opts.streamlocal_bind_mask = 0177;
+ if (options->fwd_opts.streamlocal_bind_unlink == -1)
+ options->fwd_opts.streamlocal_bind_unlink = 0;
+ if (options->fingerprint_hash == -1)
+ options->fingerprint_hash = SSH_FP_HASH_DEFAULT;
+ if (options->disable_forwarding == -1)
+ options->disable_forwarding = 0;
+ if (options->expose_userauth_info == -1)
+ options->expose_userauth_info = 0;
+ if (options->sk_provider == NULL)
+ options->sk_provider = xstrdup("internal");
+
+ assemble_algorithms(options);
+
+ /* Turn privilege separation and sandboxing on by default */
+ if (use_privsep == -1)
+ use_privsep = PRIVSEP_ON;
+
+#define CLEAR_ON_NONE(v) \
+ do { \
+ if (option_clear_or_none(v)) { \
+ free(v); \
+ v = NULL; \
+ } \
+ } while(0)
+ CLEAR_ON_NONE(options->pid_file);
+ CLEAR_ON_NONE(options->xauth_location);
+ CLEAR_ON_NONE(options->banner);
+ CLEAR_ON_NONE(options->trusted_user_ca_keys);
+ CLEAR_ON_NONE(options->revoked_keys_file);
+ CLEAR_ON_NONE(options->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]);
+#undef CLEAR_ON_NONE
+
+ /* Similar handling for AuthenticationMethods=any */
+ if (options->num_auth_methods == 1 &&
+ strcmp(options->auth_methods[0], "any") == 0) {
+ free(options->auth_methods[0]);
+ options->auth_methods[0] = NULL;
+ options->num_auth_methods = 0;
+ }
+}
+
+/* Keyword tokens. */
+typedef enum {
+ sBadOption, /* == unknown option */
+ /* Portable-specific options */
+ sUsePAM,
+ /* Standard Options */
+ sPort, sHostKeyFile, sLoginGraceTime,
+ sPermitRootLogin, sLogFacility, sLogLevel,
+ sRhostsRSAAuthentication, sRSAAuthentication,
+ sKerberosAuthentication, sKerberosOrLocalPasswd, sKerberosTicketCleanup,
+ sKerberosGetAFSToken, sChallengeResponseAuthentication,
+ sPasswordAuthentication, sKbdInteractiveAuthentication,
+ sListenAddress, sAddressFamily,
+ sPrintMotd, sPrintLastLog, sIgnoreRhosts,
+ sX11Forwarding, sX11DisplayOffset, sX11UseLocalhost,
+ sPermitTTY, sStrictModes, sEmptyPasswd, sTCPKeepAlive,
+ sPermitUserEnvironment, sAllowTcpForwarding, sCompression,
+ sRekeyLimit, sAllowUsers, sDenyUsers, sAllowGroups, sDenyGroups,
+ sIgnoreUserKnownHosts, sCiphers, sMacs, sPidFile,
+ sGatewayPorts, sPubkeyAuthentication, sPubkeyAcceptedKeyTypes,
+ sXAuthLocation, sSubsystem, sMaxStartups, sMaxAuthTries, sMaxSessions,
+ sBanner, sUseDNS, sHostbasedAuthentication,
+ sHostbasedUsesNameFromPacketOnly, sHostbasedAcceptedKeyTypes,
+ sHostKeyAlgorithms,
+ sClientAliveInterval, sClientAliveCountMax, sAuthorizedKeysFile,
+ sGssAuthentication, sGssCleanupCreds, sGssStrictAcceptor,
+ sAcceptEnv, sSetEnv, sPermitTunnel,
+ sMatch, sPermitOpen, sPermitListen, sForceCommand, sChrootDirectory,
+ sUsePrivilegeSeparation, sAllowAgentForwarding,
+ sHostCertificate, sInclude,
+ sRevokedKeys, sTrustedUserCAKeys, sAuthorizedPrincipalsFile,
+ sAuthorizedPrincipalsCommand, sAuthorizedPrincipalsCommandUser,
+ sKexAlgorithms, sCASignatureAlgorithms, sIPQoS, sVersionAddendum,
+ sAuthorizedKeysCommand, sAuthorizedKeysCommandUser,
+ sAuthenticationMethods, sHostKeyAgent, sPermitUserRC,
+ sStreamLocalBindMask, sStreamLocalBindUnlink,
+ sAllowStreamLocalForwarding, sFingerprintHash, sDisableForwarding,
+ sExposeAuthInfo, sRDomain, sPubkeyAuthOptions, sSecurityKeyProvider,
+ sDeprecated, sIgnore, sUnsupported
+} 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[] = {
+ /* Portable-specific options */
+#ifdef USE_PAM
+ { "usepam", sUsePAM, SSHCFG_GLOBAL },
+#else
+ { "usepam", sUnsupported, SSHCFG_GLOBAL },
+#endif
+ { "pamauthenticationviakbdint", sDeprecated, SSHCFG_GLOBAL },
+ /* Standard Options */
+ { "port", sPort, SSHCFG_GLOBAL },
+ { "hostkey", sHostKeyFile, SSHCFG_GLOBAL },
+ { "hostdsakey", sHostKeyFile, SSHCFG_GLOBAL }, /* alias */
+ { "hostkeyagent", sHostKeyAgent, SSHCFG_GLOBAL },
+ { "pidfile", sPidFile, SSHCFG_GLOBAL },
+ { "serverkeybits", sDeprecated, SSHCFG_GLOBAL },
+ { "logingracetime", sLoginGraceTime, SSHCFG_GLOBAL },
+ { "keyregenerationinterval", sDeprecated, SSHCFG_GLOBAL },
+ { "permitrootlogin", sPermitRootLogin, SSHCFG_ALL },
+ { "syslogfacility", sLogFacility, SSHCFG_GLOBAL },
+ { "loglevel", sLogLevel, SSHCFG_ALL },
+ { "rhostsauthentication", sDeprecated, SSHCFG_GLOBAL },
+ { "rhostsrsaauthentication", sDeprecated, SSHCFG_ALL },
+ { "hostbasedauthentication", sHostbasedAuthentication, SSHCFG_ALL },
+ { "hostbasedusesnamefrompacketonly", sHostbasedUsesNameFromPacketOnly, SSHCFG_ALL },
+ { "hostbasedacceptedkeytypes", sHostbasedAcceptedKeyTypes, SSHCFG_ALL },
+ { "hostkeyalgorithms", sHostKeyAlgorithms, SSHCFG_GLOBAL },
+ { "rsaauthentication", sDeprecated, SSHCFG_ALL },
+ { "pubkeyauthentication", sPubkeyAuthentication, SSHCFG_ALL },
+ { "pubkeyacceptedkeytypes", sPubkeyAcceptedKeyTypes, SSHCFG_ALL },
+ { "pubkeyauthoptions", sPubkeyAuthOptions, SSHCFG_ALL },
+ { "dsaauthentication", sPubkeyAuthentication, SSHCFG_GLOBAL }, /* alias */
+#ifdef KRB5
+ { "kerberosauthentication", sKerberosAuthentication, SSHCFG_ALL },
+ { "kerberosorlocalpasswd", sKerberosOrLocalPasswd, SSHCFG_GLOBAL },
+ { "kerberosticketcleanup", sKerberosTicketCleanup, SSHCFG_GLOBAL },
+#ifdef USE_AFS
+ { "kerberosgetafstoken", sKerberosGetAFSToken, SSHCFG_GLOBAL },
+#else
+ { "kerberosgetafstoken", sUnsupported, SSHCFG_GLOBAL },
+#endif
+#else
+ { "kerberosauthentication", sUnsupported, SSHCFG_ALL },
+ { "kerberosorlocalpasswd", sUnsupported, SSHCFG_GLOBAL },
+ { "kerberosticketcleanup", sUnsupported, SSHCFG_GLOBAL },
+ { "kerberosgetafstoken", sUnsupported, SSHCFG_GLOBAL },
+#endif
+ { "kerberostgtpassing", sUnsupported, SSHCFG_GLOBAL },
+ { "afstokenpassing", sUnsupported, SSHCFG_GLOBAL },
+#ifdef GSSAPI
+ { "gssapiauthentication", sGssAuthentication, SSHCFG_ALL },
+ { "gssapicleanupcredentials", sGssCleanupCreds, SSHCFG_GLOBAL },
+ { "gssapistrictacceptorcheck", sGssStrictAcceptor, SSHCFG_GLOBAL },
+#else
+ { "gssapiauthentication", sUnsupported, SSHCFG_ALL },
+ { "gssapicleanupcredentials", sUnsupported, SSHCFG_GLOBAL },
+ { "gssapistrictacceptorcheck", sUnsupported, SSHCFG_GLOBAL },
+#endif
+ { "passwordauthentication", sPasswordAuthentication, SSHCFG_ALL },
+ { "kbdinteractiveauthentication", sKbdInteractiveAuthentication, SSHCFG_ALL },
+ { "challengeresponseauthentication", sChallengeResponseAuthentication, SSHCFG_GLOBAL },
+ { "skeyauthentication", sDeprecated, SSHCFG_GLOBAL },
+ { "checkmail", sDeprecated, SSHCFG_GLOBAL },
+ { "listenaddress", sListenAddress, SSHCFG_GLOBAL },
+ { "addressfamily", sAddressFamily, SSHCFG_GLOBAL },
+ { "printmotd", sPrintMotd, SSHCFG_GLOBAL },
+#ifdef DISABLE_LASTLOG
+ { "printlastlog", sUnsupported, SSHCFG_GLOBAL },
+#else
+ { "printlastlog", sPrintLastLog, SSHCFG_GLOBAL },
+#endif
+ { "ignorerhosts", sIgnoreRhosts, SSHCFG_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_GLOBAL },
+ { "maxstartups", sMaxStartups, SSHCFG_GLOBAL },
+ { "maxauthtries", sMaxAuthTries, SSHCFG_ALL },
+ { "maxsessions", sMaxSessions, SSHCFG_ALL },
+ { "banner", sBanner, SSHCFG_ALL },
+ { "usedns", sUseDNS, SSHCFG_GLOBAL },
+ { "verifyreversemapping", sDeprecated, SSHCFG_GLOBAL },
+ { "reversemappingcheck", sDeprecated, SSHCFG_GLOBAL },
+ { "clientaliveinterval", sClientAliveInterval, SSHCFG_ALL },
+ { "clientalivecountmax", sClientAliveCountMax, SSHCFG_ALL },
+ { "authorizedkeysfile", sAuthorizedKeysFile, SSHCFG_ALL },
+ { "authorizedkeysfile2", sDeprecated, SSHCFG_ALL },
+ { "useprivilegeseparation", sDeprecated, SSHCFG_GLOBAL},
+ { "acceptenv", sAcceptEnv, SSHCFG_ALL },
+ { "setenv", sSetEnv, SSHCFG_ALL },
+ { "permittunnel", sPermitTunnel, SSHCFG_ALL },
+ { "permittty", sPermitTTY, SSHCFG_ALL },
+ { "permituserrc", sPermitUserRC, SSHCFG_ALL },
+ { "match", sMatch, SSHCFG_ALL },
+ { "permitopen", sPermitOpen, SSHCFG_ALL },
+ { "permitlisten", sPermitListen, SSHCFG_ALL },
+ { "forcecommand", sForceCommand, SSHCFG_ALL },
+ { "chrootdirectory", sChrootDirectory, SSHCFG_ALL },
+ { "hostcertificate", sHostCertificate, SSHCFG_GLOBAL },
+ { "revokedkeys", sRevokedKeys, SSHCFG_ALL },
+ { "trustedusercakeys", sTrustedUserCAKeys, SSHCFG_ALL },
+ { "authorizedprincipalsfile", sAuthorizedPrincipalsFile, SSHCFG_ALL },
+ { "kexalgorithms", sKexAlgorithms, SSHCFG_GLOBAL },
+ { "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 },
+ { "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 },
+ { NULL, sBadOption, 0 }
+};
+
+static struct {
+ int val;
+ char *text;
+} tunmode_desc[] = {
+ { SSH_TUNMODE_NO, "no" },
+ { SSH_TUNMODE_POINTOPOINT, "point-to-point" },
+ { SSH_TUNMODE_ETHERNET, "ethernet" },
+ { SSH_TUNMODE_YES, "yes" },
+ { -1, NULL }
+};
+
+/* Returns an opcode name from its number */
+
+static const char *
+lookup_opcode_name(ServerOpCodes code)
+{
+ u_int i;
+
+ for (i = 0; keywords[i].name != NULL; i++)
+ if (keywords[i].opcode == code)
+ return(keywords[i].name);
+ return "UNKNOWN";
+}
+
+
+/*
+ * Returns the number of the token pointed to by cp or sBadOption.
+ */
+
+static ServerOpCodes
+parse_token(const char *cp, const char *filename,
+ int linenum, u_int *flags)
+{
+ u_int i;
+
+ for (i = 0; keywords[i].name; i++)
+ if (strcasecmp(cp, keywords[i].name) == 0) {
+ *flags = keywords[i].flags;
+ return keywords[i].opcode;
+ }
+
+ error("%s: line %d: Bad configuration option: %s",
+ filename, linenum, cp);
+ return sBadOption;
+}
+
+char *
+derelativise_path(const char *path)
+{
+ char *expanded, *ret, cwd[PATH_MAX];
+
+ if (strcasecmp(path, "none") == 0)
+ return xstrdup("none");
+ expanded = tilde_expand_filename(path, getuid());
+ if (path_absolute(expanded))
+ return expanded;
+ if (getcwd(cwd, sizeof(cwd)) == NULL)
+ fatal("%s: getcwd: %s", __func__, strerror(errno));
+ xasprintf(&ret, "%s/%s", cwd, expanded);
+ free(expanded);
+ return ret;
+}
+
+static void
+add_listen_addr(ServerOptions *options, const char *addr,
+ const char *rdomain, int port)
+{
+ u_int i;
+
+ if (port > 0)
+ add_one_listen_addr(options, addr, rdomain, port);
+ else {
+ for (i = 0; i < options->num_ports; i++) {
+ add_one_listen_addr(options, addr, rdomain,
+ options->ports[i]);
+ }
+ }
+}
+
+static void
+add_one_listen_addr(ServerOptions *options, const char *addr,
+ const char *rdomain, int port)
+{
+ struct addrinfo hints, *ai, *aitop;
+ char strport[NI_MAXSERV];
+ int gaierr;
+ u_int i;
+
+ /* Find listen_addrs entry for this rdomain */
+ for (i = 0; i < options->num_listen_addrs; i++) {
+ if (rdomain == NULL && options->listen_addrs[i].rdomain == NULL)
+ break;
+ if (rdomain == NULL || options->listen_addrs[i].rdomain == NULL)
+ continue;
+ if (strcmp(rdomain, options->listen_addrs[i].rdomain) == 0)
+ break;
+ }
+ if (i >= options->num_listen_addrs) {
+ /* No entry for this rdomain; allocate one */
+ if (i >= INT_MAX)
+ fatal("%s: too many listen addresses", __func__);
+ options->listen_addrs = xrecallocarray(options->listen_addrs,
+ options->num_listen_addrs, options->num_listen_addrs + 1,
+ sizeof(*options->listen_addrs));
+ i = options->num_listen_addrs++;
+ if (rdomain != NULL)
+ options->listen_addrs[i].rdomain = xstrdup(rdomain);
+ }
+ /* options->listen_addrs[i] points to the addresses for this rdomain */
+
+ memset(&hints, 0, sizeof(hints));
+ hints.ai_family = options->address_family;
+ hints.ai_socktype = SOCK_STREAM;
+ hints.ai_flags = (addr == NULL) ? AI_PASSIVE : 0;
+ snprintf(strport, sizeof strport, "%d", port);
+ if ((gaierr = getaddrinfo(addr, strport, &hints, &aitop)) != 0)
+ fatal("bad addr or host: %s (%s)",
+ addr ? addr : "<NULL>",
+ ssh_gai_strerror(gaierr));
+ for (ai = aitop; ai->ai_next; ai = ai->ai_next)
+ ;
+ ai->ai_next = options->listen_addrs[i].addrs;
+ options->listen_addrs[i].addrs = aitop;
+}
+
+/* Returns nonzero if the routing domain name is valid */
+static int
+valid_rdomain(const char *name)
+{
+#if defined(HAVE_SYS_VALID_RDOMAIN)
+ return sys_valid_rdomain(name);
+#elif defined(__OpenBSD__)
+ const char *errstr;
+ long long num;
+ struct rt_tableinfo info;
+ int mib[6];
+ size_t miblen = sizeof(mib);
+
+ if (name == NULL)
+ return 1;
+
+ num = strtonum(name, 0, 255, &errstr);
+ if (errstr != NULL)
+ return 0;
+
+ /* Check whether the table actually exists */
+ memset(mib, 0, sizeof(mib));
+ mib[0] = CTL_NET;
+ mib[1] = PF_ROUTE;
+ mib[4] = NET_RT_TABLE;
+ mib[5] = (int)num;
+ if (sysctl(mib, 6, &info, &miblen, NULL, 0) == -1)
+ return 0;
+
+ return 1;
+#else /* defined(__OpenBSD__) */
+ error("Routing domains are not supported on this platform");
+ return 0;
+#endif
+}
+
+/*
+ * Queue a ListenAddress to be processed once we have all of the Ports
+ * and AddressFamily options.
+ */
+static void
+queue_listen_addr(ServerOptions *options, const char *addr,
+ const char *rdomain, int port)
+{
+ struct queued_listenaddr *qla;
+
+ options->queued_listen_addrs = xrecallocarray(
+ options->queued_listen_addrs,
+ options->num_queued_listens, options->num_queued_listens + 1,
+ sizeof(*options->queued_listen_addrs));
+ qla = &options->queued_listen_addrs[options->num_queued_listens++];
+ qla->addr = xstrdup(addr);
+ qla->port = port;
+ qla->rdomain = rdomain == NULL ? NULL : xstrdup(rdomain);
+}
+
+/*
+ * Process queued (text) ListenAddress entries.
+ */
+static void
+process_queued_listen_addrs(ServerOptions *options)
+{
+ u_int i;
+ struct queued_listenaddr *qla;
+
+ if (options->num_ports == 0)
+ options->ports[options->num_ports++] = SSH_DEFAULT_PORT;
+ if (options->address_family == -1)
+ options->address_family = AF_UNSPEC;
+
+ for (i = 0; i < options->num_queued_listens; i++) {
+ qla = &options->queued_listen_addrs[i];
+ add_listen_addr(options, qla->addr, qla->rdomain, qla->port);
+ free(qla->addr);
+ free(qla->rdomain);
+ }
+ free(options->queued_listen_addrs);
+ options->queued_listen_addrs = NULL;
+ options->num_queued_listens = 0;
+}
+
+/*
+ * Inform channels layer of permitopen options for a single forwarding
+ * direction (local/remote).
+ */
+static void
+process_permitopen_list(struct ssh *ssh, ServerOpCodes opcode,
+ char **opens, u_int num_opens)
+{
+ u_int i;
+ int port;
+ char *host, *arg, *oarg, ch;
+ 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]);
+ ch = '\0';
+ host = hpdelim2(&arg, &ch);
+ if (host == NULL || ch == '/')
+ fatal("%s: missing host in %s", __func__, what);
+ host = cleanhostname(host);
+ if (arg == NULL || ((port = permitopen_port(arg)) < 0))
+ fatal("%s: bad port number in %s", __func__, what);
+ /* Send it to channels layer */
+ channel_add_permission(ssh, FORWARD_ADM,
+ where, host, port);
+ free(oarg);
+ }
+}
+
+/*
+ * Inform channels layer of permitopen options from configuration.
+ */
+void
+process_permitopen(struct ssh *ssh, ServerOptions *options)
+{
+ process_permitopen_list(ssh, sPermitOpen,
+ options->permitted_opens, options->num_permitted_opens);
+ process_permitopen_list(ssh, sPermitListen,
+ options->permitted_listens,
+ options->num_permitted_listens);
+}
+
+struct connection_info *
+get_connection_info(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;
+}
+
+static void
+match_test_missing_fatal(const char *criteria, const char *attrib)
+{
+ fatal("'Match %s' in configuration but '%s' not in connection "
+ "test specification.", criteria, attrib);
+}
+
+/*
+ * All of the attributes on a single Match line are ANDed together, so we need
+ * to check every attribute and set the result to zero if any attribute does
+ * not match.
+ */
+static int
+match_cfg_line(char **condition, int line, struct connection_info *ci)
+{
+ int result = 1, attributes = 0, port;
+ char *arg, *attrib, *cp = *condition;
+
+ if (ci == NULL)
+ debug3("checking syntax for 'Match %s'", cp);
+ else
+ debug3("checking match for '%s' user %s host %s addr %s "
+ "laddr %s lport %d", cp, ci->user ? ci->user : "(null)",
+ ci->host ? ci->host : "(null)",
+ ci->address ? ci->address : "(null)",
+ ci->laddress ? ci->laddress : "(null)", ci->lport);
+
+ while ((attrib = strdelim(&cp)) && *attrib != '\0') {
+ attributes++;
+ if (strcasecmp(attrib, "all") == 0) {
+ if (attributes != 1 ||
+ ((arg = strdelim(&cp)) != NULL && *arg != '\0')) {
+ error("'all' cannot be combined with other "
+ "Match attributes");
+ return -1;
+ }
+ *condition = cp;
+ return 1;
+ }
+ if ((arg = strdelim(&cp)) == NULL || *arg == '\0') {
+ error("Missing Match criteria for %s", attrib);
+ return -1;
+ }
+ if (strcasecmp(attrib, "user") == 0) {
+ if (ci == NULL || (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 {
+ 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 ch, *cp, ***chararrayptr, **charptr, *arg, *arg2, *p;
+ int cmdline = 0, *intptr, value, value2, n, port, oactive, r, found;
+ SyslogFacility *log_facility_ptr;
+ LogLevel *log_level_ptr;
+ ServerOpCodes opcode;
+ u_int i, *uintptr, uvalue, flags = 0;
+ size_t len;
+ long long val64;
+ const struct multistate *multistate_ptr;
+ const char *errstr;
+ struct include_item *item;
+ glob_t gbuf;
+
+ /* Strip trailing whitespace. Allow \f (form feed) at EOL only */
+ if ((len = strlen(line)) == 0)
+ return 0;
+ for (len--; len > 0; len--) {
+ if (strchr(WHITESPACE "\f", line[len]) == NULL)
+ break;
+ line[len] = '\0';
+ }
+
+ cp = line;
+ if ((arg = strdelim(&cp)) == NULL)
+ return 0;
+ /* Ignore leading whitespace */
+ if (*arg == '\0')
+ arg = strdelim(&cp);
+ if (!arg || !*arg || *arg == '#')
+ return 0;
+ intptr = NULL;
+ charptr = NULL;
+ opcode = parse_token(arg, filename, linenum, &flags);
+
+ if (activep == NULL) { /* We are processing a command line directive */
+ cmdline = 1;
+ activep = &cmdline;
+ }
+ if (*activep && opcode != sMatch && opcode != sInclude)
+ debug3("%s:%d setting %s %s", filename, linenum, arg, cp);
+ if (*activep == 0 && !(flags & SSHCFG_MATCH)) {
+ if (connectinfo == NULL) {
+ fatal("%s line %d: Directive '%s' is not allowed "
+ "within a Match block", filename, linenum, arg);
+ } else { /* this is a directive we have already processed */
+ while (arg)
+ arg = strdelim(&cp);
+ return 0;
+ }
+ }
+
+ switch (opcode) {
+ /* Portable-specific options */
+ case sUsePAM:
+ intptr = &options->use_pam;
+ goto parse_flag;
+
+ /* Standard Options */
+ case sBadOption:
+ return -1;
+ case sPort:
+ /* ignore ports from configfile if cmdline specifies ports */
+ if (options->ports_from_cmdline)
+ return 0;
+ if (options->num_ports >= MAX_PORTS)
+ fatal("%s line %d: too many ports.",
+ filename, linenum);
+ arg = strdelim(&cp);
+ if (!arg || *arg == '\0')
+ fatal("%s line %d: missing port number.",
+ filename, linenum);
+ options->ports[options->num_ports++] = a2port(arg);
+ if (options->ports[options->num_ports-1] <= 0)
+ fatal("%s line %d: Badly formatted port number.",
+ filename, linenum);
+ break;
+
+ case sLoginGraceTime:
+ intptr = &options->login_grace_time;
+ parse_time:
+ arg = strdelim(&cp);
+ if (!arg || *arg == '\0')
+ fatal("%s line %d: missing time value.",
+ filename, linenum);
+ if ((value = convtime(arg)) == -1)
+ fatal("%s line %d: invalid time value.",
+ filename, linenum);
+ if (*activep && *intptr == -1)
+ *intptr = value;
+ break;
+
+ case sListenAddress:
+ arg = strdelim(&cp);
+ if (arg == NULL || *arg == '\0')
+ fatal("%s line %d: missing address",
+ filename, linenum);
+ /* check for bare IPv6 address: no "[]" and 2 or more ":" */
+ if (strchr(arg, '[') == NULL && (p = strchr(arg, ':')) != NULL
+ && strchr(p+1, ':') != NULL) {
+ port = 0;
+ p = arg;
+ } else {
+ arg2 = NULL;
+ ch = '\0';
+ p = hpdelim2(&arg, &ch);
+ if (p == NULL || ch == '/')
+ fatal("%s line %d: bad address:port usage",
+ filename, linenum);
+ p = cleanhostname(p);
+ if (arg == NULL)
+ port = 0;
+ else if ((port = a2port(arg)) <= 0)
+ fatal("%s line %d: bad port number",
+ filename, linenum);
+ }
+ /* Optional routing table */
+ arg2 = NULL;
+ if ((arg = strdelim(&cp)) != NULL) {
+ if (strcmp(arg, "rdomain") != 0 ||
+ (arg2 = strdelim(&cp)) == NULL)
+ fatal("%s line %d: bad ListenAddress syntax",
+ filename, linenum);
+ if (!valid_rdomain(arg2))
+ fatal("%s line %d: bad routing domain",
+ filename, linenum);
+ }
+
+ queue_listen_addr(options, p, arg2, port);
+
+ break;
+
+ case sAddressFamily:
+ intptr = &options->address_family;
+ multistate_ptr = multistate_addressfamily;
+ parse_multistate:
+ arg = strdelim(&cp);
+ if (!arg || *arg == '\0')
+ fatal("%s line %d: missing argument.",
+ filename, linenum);
+ value = -1;
+ for (i = 0; multistate_ptr[i].key != NULL; i++) {
+ if (strcasecmp(arg, multistate_ptr[i].key) == 0) {
+ value = multistate_ptr[i].value;
+ break;
+ }
+ }
+ if (value == -1)
+ fatal("%s line %d: unsupported option \"%s\".",
+ filename, linenum, arg);
+ if (*activep && *intptr == -1)
+ *intptr = value;
+ break;
+
+ case sHostKeyFile:
+ arg = strdelim(&cp);
+ if (!arg || *arg == '\0')
+ fatal("%s line %d: missing file name.",
+ filename, linenum);
+ if (*activep) {
+ servconf_add_hostkey(filename, linenum,
+ options, arg, 1);
+ }
+ break;
+
+ case sHostKeyAgent:
+ charptr = &options->host_key_agent;
+ arg = strdelim(&cp);
+ if (!arg || *arg == '\0')
+ fatal("%s line %d: missing socket name.",
+ filename, linenum);
+ if (*activep && *charptr == NULL)
+ *charptr = !strcmp(arg, SSH_AUTHSOCKET_ENV_NAME) ?
+ xstrdup(arg) : derelativise_path(arg);
+ break;
+
+ case sHostCertificate:
+ arg = strdelim(&cp);
+ if (!arg || *arg == '\0')
+ fatal("%s line %d: missing file name.",
+ filename, linenum);
+ if (*activep)
+ servconf_add_hostcert(filename, linenum, options, arg);
+ break;
+
+ case sPidFile:
+ charptr = &options->pid_file;
+ parse_filename:
+ arg = strdelim(&cp);
+ if (!arg || *arg == '\0')
+ fatal("%s line %d: missing file name.",
+ filename, linenum);
+ if (*activep && *charptr == NULL) {
+ *charptr = derelativise_path(arg);
+ /* increase optional counter */
+ if (intptr != NULL)
+ *intptr = *intptr + 1;
+ }
+ break;
+
+ case sPermitRootLogin:
+ intptr = &options->permit_root_login;
+ multistate_ptr = multistate_permitrootlogin;
+ goto parse_multistate;
+
+ case sIgnoreRhosts:
+ intptr = &options->ignore_rhosts;
+ multistate_ptr = multistate_ignore_rhosts;
+ goto parse_multistate;
+
+ 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 sHostbasedAcceptedKeyTypes:
+ charptr = &options->hostbased_key_types;
+ parse_keytypes:
+ arg = strdelim(&cp);
+ if (!arg || *arg == '\0')
+ fatal("%s line %d: Missing argument.",
+ filename, linenum);
+ if (*arg != '-' &&
+ !sshkey_names_valid2(*arg == '+' || *arg == '^' ?
+ arg + 1 : arg, 1))
+ fatal("%s line %d: Bad key types '%s'.",
+ filename, linenum, arg ? arg : "<NONE>");
+ if (*activep && *charptr == NULL)
+ *charptr = xstrdup(arg);
+ break;
+
+ case sHostKeyAlgorithms:
+ charptr = &options->hostkeyalgorithms;
+ goto parse_keytypes;
+
+ case sCASignatureAlgorithms:
+ charptr = &options->ca_sign_algorithms;
+ goto parse_keytypes;
+
+ case sPubkeyAuthentication:
+ intptr = &options->pubkey_authentication;
+ goto parse_flag;
+
+ case sPubkeyAcceptedKeyTypes:
+ charptr = &options->pubkey_key_types;
+ goto parse_keytypes;
+
+ case sPubkeyAuthOptions:
+ intptr = &options->pubkey_auth_options;
+ value = 0;
+ while ((arg = strdelim(&cp)) && *arg != '\0') {
+ 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 {
+ fatal("%s line %d: unsupported "
+ "PubkeyAuthOptions option %s",
+ filename, linenum, arg);
+ }
+ }
+ 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 sKerberosGetAFSToken:
+ intptr = &options->kerberos_get_afs_token;
+ goto parse_flag;
+
+ case sGssAuthentication:
+ intptr = &options->gss_authentication;
+ goto parse_flag;
+
+ case sGssCleanupCreds:
+ intptr = &options->gss_cleanup_creds;
+ goto parse_flag;
+
+ case sGssStrictAcceptor:
+ intptr = &options->gss_strict_acceptor;
+ goto parse_flag;
+
+ case sPasswordAuthentication:
+ intptr = &options->password_authentication;
+ goto parse_flag;
+
+ case sKbdInteractiveAuthentication:
+ intptr = &options->kbd_interactive_authentication;
+ goto parse_flag;
+
+ case sChallengeResponseAuthentication:
+ intptr = &options->challenge_response_authentication;
+ goto parse_flag;
+
+ case sPrintMotd:
+ intptr = &options->print_motd;
+ goto parse_flag;
+
+ case sPrintLastLog:
+ intptr = &options->print_lastlog;
+ goto parse_flag;
+
+ case sX11Forwarding:
+ intptr = &options->x11_forwarding;
+ goto parse_flag;
+
+ case sX11DisplayOffset:
+ intptr = &options->x11_display_offset;
+ parse_int:
+ arg = strdelim(&cp);
+ if ((errstr = atoi_err(arg, &value)) != NULL)
+ fatal("%s line %d: integer value %s.",
+ filename, linenum, errstr);
+ if (*activep && *intptr == -1)
+ *intptr = value;
+ break;
+
+ case sX11UseLocalhost:
+ intptr = &options->x11_use_localhost;
+ goto parse_flag;
+
+ case sXAuthLocation:
+ charptr = &options->xauth_location;
+ goto parse_filename;
+
+ case sPermitTTY:
+ intptr = &options->permit_tty;
+ goto parse_flag;
+
+ case sPermitUserRC:
+ intptr = &options->permit_user_rc;
+ goto parse_flag;
+
+ case sStrictModes:
+ intptr = &options->strict_modes;
+ goto parse_flag;
+
+ case sTCPKeepAlive:
+ intptr = &options->tcp_keep_alive;
+ goto parse_flag;
+
+ case sEmptyPasswd:
+ intptr = &options->permit_empty_passwd;
+ goto parse_flag;
+
+ case sPermitUserEnvironment:
+ intptr = &options->permit_user_env;
+ charptr = &options->permit_user_env_allowlist;
+ arg = strdelim(&cp);
+ if (!arg || *arg == '\0')
+ fatal("%s line %d: missing argument.",
+ filename, linenum);
+ value = 0;
+ p = NULL;
+ if (strcmp(arg, "yes") == 0)
+ value = 1;
+ else if (strcmp(arg, "no") == 0)
+ value = 0;
+ else {
+ /* Pattern-list specified */
+ value = 1;
+ p = xstrdup(arg);
+ }
+ if (*activep && *intptr == -1) {
+ *intptr = value;
+ *charptr = p;
+ p = NULL;
+ }
+ free(p);
+ break;
+
+ case sCompression:
+ intptr = &options->compression;
+ multistate_ptr = multistate_compression;
+ goto parse_multistate;
+
+ case sRekeyLimit:
+ arg = strdelim(&cp);
+ if (!arg || *arg == '\0')
+ fatal("%.200s line %d: Missing argument.", filename,
+ linenum);
+ if (strcmp(arg, "default") == 0) {
+ val64 = 0;
+ } else {
+ if (scan_scaled(arg, &val64) == -1)
+ fatal("%.200s line %d: Bad number '%s': %s",
+ filename, linenum, arg, strerror(errno));
+ if (val64 != 0 && val64 < 16)
+ fatal("%.200s line %d: RekeyLimit too small",
+ filename, linenum);
+ }
+ if (*activep && options->rekey_limit == -1)
+ options->rekey_limit = val64;
+ if (cp != NULL) { /* optional rekey interval present */
+ if (strcmp(cp, "none") == 0) {
+ (void)strdelim(&cp); /* discard */
+ break;
+ }
+ intptr = &options->rekey_interval;
+ goto parse_time;
+ }
+ break;
+
+ case sGatewayPorts:
+ intptr = &options->fwd_opts.gateway_ports;
+ multistate_ptr = multistate_gatewayports;
+ goto parse_multistate;
+
+ case sUseDNS:
+ intptr = &options->use_dns;
+ goto parse_flag;
+
+ case sLogFacility:
+ log_facility_ptr = &options->log_facility;
+ arg = strdelim(&cp);
+ value = log_facility_number(arg);
+ if (value == SYSLOG_FACILITY_NOT_SET)
+ fatal("%.200s line %d: unsupported log facility '%s'",
+ filename, linenum, arg ? arg : "<NONE>");
+ if (*log_facility_ptr == -1)
+ *log_facility_ptr = (SyslogFacility) value;
+ break;
+
+ case sLogLevel:
+ log_level_ptr = &options->log_level;
+ arg = strdelim(&cp);
+ value = log_level_number(arg);
+ if (value == SYSLOG_LEVEL_NOT_SET)
+ fatal("%.200s line %d: unsupported log level '%s'",
+ filename, linenum, arg ? arg : "<NONE>");
+ if (*activep && *log_level_ptr == -1)
+ *log_level_ptr = (LogLevel) value;
+ break;
+
+ case sAllowTcpForwarding:
+ intptr = &options->allow_tcp_forwarding;
+ multistate_ptr = multistate_tcpfwd;
+ goto parse_multistate;
+
+ case sAllowStreamLocalForwarding:
+ intptr = &options->allow_streamlocal_forwarding;
+ multistate_ptr = multistate_tcpfwd;
+ goto parse_multistate;
+
+ case sAllowAgentForwarding:
+ intptr = &options->allow_agent_forwarding;
+ goto parse_flag;
+
+ case sDisableForwarding:
+ intptr = &options->disable_forwarding;
+ goto parse_flag;
+
+ case sAllowUsers:
+ while ((arg = strdelim(&cp)) && *arg != '\0') {
+ if (match_user(NULL, NULL, NULL, arg) == -1)
+ fatal("%s line %d: invalid AllowUsers pattern: "
+ "\"%.100s\"", filename, linenum, arg);
+ if (!*activep)
+ continue;
+ array_append(filename, linenum, "AllowUsers",
+ &options->allow_users, &options->num_allow_users,
+ arg);
+ }
+ break;
+
+ case sDenyUsers:
+ while ((arg = strdelim(&cp)) && *arg != '\0') {
+ if (match_user(NULL, NULL, NULL, arg) == -1)
+ fatal("%s line %d: invalid DenyUsers pattern: "
+ "\"%.100s\"", filename, linenum, arg);
+ if (!*activep)
+ continue;
+ array_append(filename, linenum, "DenyUsers",
+ &options->deny_users, &options->num_deny_users,
+ arg);
+ }
+ break;
+
+ case sAllowGroups:
+ while ((arg = strdelim(&cp)) && *arg != '\0') {
+ if (!*activep)
+ continue;
+ array_append(filename, linenum, "AllowGroups",
+ &options->allow_groups, &options->num_allow_groups,
+ arg);
+ }
+ break;
+
+ case sDenyGroups:
+ while ((arg = strdelim(&cp)) && *arg != '\0') {
+ if (!*activep)
+ continue;
+ array_append(filename, linenum, "DenyGroups",
+ &options->deny_groups, &options->num_deny_groups,
+ arg);
+ }
+ break;
+
+ case sCiphers:
+ arg = strdelim(&cp);
+ if (!arg || *arg == '\0')
+ fatal("%s line %d: Missing argument.", filename, linenum);
+ if (*arg != '-' &&
+ !ciphers_valid(*arg == '+' || *arg == '^' ? arg + 1 : arg))
+ fatal("%s line %d: Bad SSH2 cipher spec '%s'.",
+ filename, linenum, arg ? arg : "<NONE>");
+ if (options->ciphers == NULL)
+ options->ciphers = xstrdup(arg);
+ break;
+
+ case sMacs:
+ arg = strdelim(&cp);
+ if (!arg || *arg == '\0')
+ fatal("%s line %d: Missing argument.", filename, linenum);
+ if (*arg != '-' &&
+ !mac_valid(*arg == '+' || *arg == '^' ? arg + 1 : arg))
+ fatal("%s line %d: Bad SSH2 mac spec '%s'.",
+ filename, linenum, arg ? arg : "<NONE>");
+ if (options->macs == NULL)
+ options->macs = xstrdup(arg);
+ break;
+
+ case sKexAlgorithms:
+ arg = strdelim(&cp);
+ if (!arg || *arg == '\0')
+ fatal("%s line %d: Missing argument.",
+ filename, linenum);
+ if (*arg != '-' &&
+ !kex_names_valid(*arg == '+' || *arg == '^' ?
+ arg + 1 : arg))
+ fatal("%s line %d: Bad SSH2 KexAlgorithms '%s'.",
+ filename, linenum, arg ? arg : "<NONE>");
+ if (options->kex_algorithms == NULL)
+ options->kex_algorithms = xstrdup(arg);
+ break;
+
+ case sSubsystem:
+ if (options->num_subsystems >= MAX_SUBSYSTEMS) {
+ fatal("%s line %d: too many subsystems defined.",
+ filename, linenum);
+ }
+ arg = strdelim(&cp);
+ if (!arg || *arg == '\0')
+ fatal("%s line %d: Missing subsystem name.",
+ filename, linenum);
+ if (!*activep) {
+ arg = strdelim(&cp);
+ break;
+ }
+ for (i = 0; i < options->num_subsystems; i++)
+ if (strcmp(arg, options->subsystem_name[i]) == 0)
+ fatal("%s line %d: Subsystem '%s' already defined.",
+ filename, linenum, arg);
+ options->subsystem_name[options->num_subsystems] = xstrdup(arg);
+ arg = strdelim(&cp);
+ if (!arg || *arg == '\0')
+ fatal("%s line %d: Missing subsystem command.",
+ filename, linenum);
+ options->subsystem_command[options->num_subsystems] = xstrdup(arg);
+
+ /* Collect arguments (separate to executable) */
+ p = xstrdup(arg);
+ len = strlen(p) + 1;
+ while ((arg = strdelim(&cp)) != NULL && *arg != '\0') {
+ len += 1 + strlen(arg);
+ p = xreallocarray(p, 1, len);
+ strlcat(p, " ", len);
+ strlcat(p, arg, len);
+ }
+ options->subsystem_args[options->num_subsystems] = p;
+ options->num_subsystems++;
+ break;
+
+ case sMaxStartups:
+ arg = strdelim(&cp);
+ if (!arg || *arg == '\0')
+ fatal("%s line %d: Missing MaxStartups spec.",
+ filename, linenum);
+ if ((n = sscanf(arg, "%d:%d:%d",
+ &options->max_startups_begin,
+ &options->max_startups_rate,
+ &options->max_startups)) == 3) {
+ if (options->max_startups_begin >
+ options->max_startups ||
+ options->max_startups_rate > 100 ||
+ options->max_startups_rate < 1)
+ fatal("%s line %d: Illegal MaxStartups spec.",
+ filename, linenum);
+ } else if (n != 1)
+ fatal("%s line %d: Illegal MaxStartups spec.",
+ filename, linenum);
+ else
+ options->max_startups = options->max_startups_begin;
+ break;
+
+ case sMaxAuthTries:
+ intptr = &options->max_authtries;
+ goto parse_int;
+
+ case sMaxSessions:
+ intptr = &options->max_sessions;
+ goto parse_int;
+
+ case sBanner:
+ charptr = &options->banner;
+ goto parse_filename;
+
+ /*
+ * These options can contain %X options expanded at
+ * connect time, so that you can specify paths like:
+ *
+ * AuthorizedKeysFile /etc/ssh_keys/%u
+ */
+ case sAuthorizedKeysFile:
+ if (*activep && options->num_authkeys_files == 0) {
+ while ((arg = strdelim(&cp)) && *arg != '\0') {
+ arg = tilde_expand_filename(arg, getuid());
+ array_append(filename, linenum,
+ "AuthorizedKeysFile",
+ &options->authorized_keys_files,
+ &options->num_authkeys_files, arg);
+ free(arg);
+ }
+ }
+ return 0;
+
+ case sAuthorizedPrincipalsFile:
+ charptr = &options->authorized_principals_file;
+ arg = strdelim(&cp);
+ if (!arg || *arg == '\0')
+ fatal("%s line %d: missing file name.",
+ filename, linenum);
+ if (*activep && *charptr == NULL) {
+ *charptr = tilde_expand_filename(arg, getuid());
+ /* increase optional counter */
+ if (intptr != NULL)
+ *intptr = *intptr + 1;
+ }
+ break;
+
+ case sClientAliveInterval:
+ intptr = &options->client_alive_interval;
+ goto parse_time;
+
+ case sClientAliveCountMax:
+ intptr = &options->client_alive_count_max;
+ goto parse_int;
+
+ case sAcceptEnv:
+ while ((arg = strdelim(&cp)) && *arg != '\0') {
+ if (strchr(arg, '=') != NULL)
+ fatal("%s line %d: Invalid environment name.",
+ filename, linenum);
+ if (!*activep)
+ continue;
+ array_append(filename, linenum, "AcceptEnv",
+ &options->accept_env, &options->num_accept_env,
+ arg);
+ }
+ break;
+
+ case sSetEnv:
+ uvalue = options->num_setenv;
+ while ((arg = strdelimw(&cp)) && *arg != '\0') {
+ if (strchr(arg, '=') == NULL)
+ fatal("%s line %d: Invalid environment.",
+ filename, linenum);
+ if (!*activep || uvalue != 0)
+ continue;
+ array_append(filename, linenum, "SetEnv",
+ &options->setenv, &options->num_setenv, arg);
+ }
+ break;
+
+ case sPermitTunnel:
+ intptr = &options->permit_tun;
+ arg = strdelim(&cp);
+ if (!arg || *arg == '\0')
+ fatal("%s line %d: Missing yes/point-to-point/"
+ "ethernet/no argument.", filename, linenum);
+ value = -1;
+ for (i = 0; tunmode_desc[i].val != -1; i++)
+ if (strcmp(tunmode_desc[i].text, arg) == 0) {
+ value = tunmode_desc[i].val;
+ break;
+ }
+ if (value == -1)
+ fatal("%s line %d: Bad yes/point-to-point/ethernet/"
+ "no argument: %s", filename, linenum, arg);
+ if (*activep && *intptr == -1)
+ *intptr = value;
+ break;
+
+ case sInclude:
+ if (cmdline) {
+ fatal("Include directive not supported as a "
+ "command-line option");
+ }
+ value = 0;
+ while ((arg2 = strdelim(&cp)) != NULL && *arg2 != '\0') {
+ 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("%s: too many glob results", __func__);
+ 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("%s: sshbuf_new failed",
+ __func__);
+ }
+ 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: Include missing filename argument",
+ filename, linenum);
+ }
+ break;
+
+ case sMatch:
+ if (cmdline)
+ fatal("Match directive not supported as a command-line "
+ "option");
+ value = match_cfg_line(&cp, 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 is applicable only until the first match block */
+ *inc_flags &= ~SSHCFG_MATCH_ONLY;
+ break;
+
+ case sPermitListen:
+ case sPermitOpen:
+ if (opcode == sPermitListen) {
+ uintptr = &options->num_permitted_listens;
+ chararrayptr = &options->permitted_listens;
+ } else {
+ uintptr = &options->num_permitted_opens;
+ chararrayptr = &options->permitted_opens;
+ }
+ arg = strdelim(&cp);
+ if (!arg || *arg == '\0')
+ fatal("%s line %d: missing %s specification",
+ filename, linenum, lookup_opcode_name(opcode));
+ uvalue = *uintptr; /* modified later */
+ if (strcmp(arg, "any") == 0 || strcmp(arg, "none") == 0) {
+ if (*activep && uvalue == 0) {
+ *uintptr = 1;
+ *chararrayptr = xcalloc(1,
+ sizeof(**chararrayptr));
+ (*chararrayptr)[0] = xstrdup(arg);
+ }
+ break;
+ }
+ for (; arg != NULL && *arg != '\0'; arg = strdelim(&cp)) {
+ if (opcode == sPermitListen &&
+ strchr(arg, ':') == NULL) {
+ /*
+ * Allow bare port number for PermitListen
+ * to indicate a wildcard listen host.
+ */
+ xasprintf(&arg2, "*:%s", arg);
+ } else {
+ arg2 = xstrdup(arg);
+ ch = '\0';
+ p = hpdelim2(&arg, &ch);
+ if (p == NULL || ch == '/') {
+ fatal("%s line %d: missing host in %s",
+ filename, linenum,
+ lookup_opcode_name(opcode));
+ }
+ p = cleanhostname(p);
+ }
+ if (arg == NULL ||
+ ((port = permitopen_port(arg)) < 0)) {
+ fatal("%s line %d: bad port number in %s",
+ filename, linenum,
+ lookup_opcode_name(opcode));
+ }
+ if (*activep && uvalue == 0) {
+ array_append(filename, linenum,
+ lookup_opcode_name(opcode),
+ chararrayptr, uintptr, arg2);
+ }
+ free(arg2);
+ }
+ break;
+
+ case sForceCommand:
+ if (cp == NULL || *cp == '\0')
+ fatal("%.200s line %d: Missing argument.", filename,
+ linenum);
+ len = strspn(cp, WHITESPACE);
+ if (*activep && options->adm_forced_command == NULL)
+ options->adm_forced_command = xstrdup(cp + len);
+ return 0;
+
+ case sChrootDirectory:
+ charptr = &options->chroot_directory;
+
+ arg = strdelim(&cp);
+ if (!arg || *arg == '\0')
+ fatal("%s line %d: missing file name.",
+ filename, linenum);
+ if (*activep && *charptr == NULL)
+ *charptr = xstrdup(arg);
+ break;
+
+ case sTrustedUserCAKeys:
+ charptr = &options->trusted_user_ca_keys;
+ goto parse_filename;
+
+ case sRevokedKeys:
+ charptr = &options->revoked_keys_file;
+ goto parse_filename;
+
+ case sSecurityKeyProvider:
+ charptr = &options->sk_provider;
+ arg = strdelim(&cp);
+ if (!arg || *arg == '\0')
+ fatal("%s line %d: missing file name.",
+ filename, linenum);
+ 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 = strdelim(&cp);
+ if ((value = parse_ipqos(arg)) == -1)
+ fatal("%s line %d: Bad IPQoS value: %s",
+ filename, linenum, arg);
+ arg = strdelim(&cp);
+ if (arg == NULL)
+ value2 = value;
+ else if ((value2 = parse_ipqos(arg)) == -1)
+ fatal("%s line %d: Bad IPQoS value: %s",
+ filename, linenum, arg);
+ if (*activep) {
+ options->ip_qos_interactive = value;
+ options->ip_qos_bulk = value2;
+ }
+ break;
+
+ case sVersionAddendum:
+ if (cp == NULL || *cp == '\0')
+ fatal("%.200s line %d: Missing argument.", filename,
+ linenum);
+ len = strspn(cp, WHITESPACE);
+ if (*activep && options->version_addendum == NULL) {
+ if (strcasecmp(cp + len, "none") == 0)
+ options->version_addendum = xstrdup("");
+ else if (strchr(cp + len, '\r') != NULL)
+ fatal("%.200s line %d: Invalid argument",
+ filename, linenum);
+ else
+ options->version_addendum = xstrdup(cp + len);
+ }
+ return 0;
+
+ case sAuthorizedKeysCommand:
+ if (cp == NULL)
+ fatal("%.200s line %d: Missing argument.", filename,
+ linenum);
+ len = strspn(cp, WHITESPACE);
+ if (*activep && options->authorized_keys_command == NULL) {
+ if (cp[len] != '/' && strcasecmp(cp + len, "none") != 0)
+ fatal("%.200s line %d: AuthorizedKeysCommand "
+ "must be an absolute path",
+ filename, linenum);
+ options->authorized_keys_command = xstrdup(cp + len);
+ }
+ return 0;
+
+ case sAuthorizedKeysCommandUser:
+ charptr = &options->authorized_keys_command_user;
+
+ arg = strdelim(&cp);
+ if (!arg || *arg == '\0')
+ fatal("%s line %d: missing AuthorizedKeysCommandUser "
+ "argument.", filename, linenum);
+ if (*activep && *charptr == NULL)
+ *charptr = xstrdup(arg);
+ break;
+
+ case sAuthorizedPrincipalsCommand:
+ if (cp == NULL)
+ fatal("%.200s line %d: Missing argument.", filename,
+ linenum);
+ len = strspn(cp, WHITESPACE);
+ if (*activep &&
+ options->authorized_principals_command == NULL) {
+ if (cp[len] != '/' && strcasecmp(cp + len, "none") != 0)
+ fatal("%.200s line %d: "
+ "AuthorizedPrincipalsCommand must be "
+ "an absolute path", filename, linenum);
+ options->authorized_principals_command =
+ xstrdup(cp + len);
+ }
+ return 0;
+
+ case sAuthorizedPrincipalsCommandUser:
+ charptr = &options->authorized_principals_command_user;
+
+ arg = strdelim(&cp);
+ if (!arg || *arg == '\0')
+ fatal("%s line %d: missing "
+ "AuthorizedPrincipalsCommandUser argument.",
+ filename, linenum);
+ if (*activep && *charptr == NULL)
+ *charptr = xstrdup(arg);
+ break;
+
+ case sAuthenticationMethods:
+ if (options->num_auth_methods == 0) {
+ value = 0; /* seen "any" pseudo-method */
+ value2 = 0; /* successfully parsed any method */
+ while ((arg = strdelim(&cp)) && *arg != '\0') {
+ if (strcmp(arg, "any") == 0) {
+ if (options->num_auth_methods > 0) {
+ fatal("%s line %d: \"any\" "
+ "must appear alone in "
+ "AuthenticationMethods",
+ filename, linenum);
+ }
+ value = 1;
+ } else if (value) {
+ fatal("%s line %d: \"any\" must appear "
+ "alone in AuthenticationMethods",
+ filename, linenum);
+ } else if (auth2_methods_valid(arg, 0) != 0) {
+ fatal("%s line %d: invalid "
+ "authentication method list.",
+ filename, linenum);
+ }
+ value2 = 1;
+ if (!*activep)
+ continue;
+ array_append(filename, linenum,
+ "AuthenticationMethods",
+ &options->auth_methods,
+ &options->num_auth_methods, arg);
+ }
+ if (value2 == 0) {
+ fatal("%s line %d: no AuthenticationMethods "
+ "specified", filename, linenum);
+ }
+ }
+ return 0;
+
+ case sStreamLocalBindMask:
+ arg = strdelim(&cp);
+ if (!arg || *arg == '\0')
+ fatal("%s line %d: missing StreamLocalBindMask "
+ "argument.", filename, linenum);
+ /* Parse mode in octal format */
+ value = strtol(arg, &p, 8);
+ if (arg == p || value < 0 || value > 0777)
+ fatal("%s line %d: Bad mask.", filename, linenum);
+ if (*activep)
+ options->fwd_opts.streamlocal_bind_mask = (mode_t)value;
+ break;
+
+ case sStreamLocalBindUnlink:
+ intptr = &options->fwd_opts.streamlocal_bind_unlink;
+ goto parse_flag;
+
+ case sFingerprintHash:
+ arg = strdelim(&cp);
+ if (!arg || *arg == '\0')
+ fatal("%.200s line %d: Missing argument.",
+ filename, linenum);
+ if ((value = ssh_digest_alg_by_name(arg)) == -1)
+ fatal("%.200s line %d: Invalid hash algorithm \"%s\".",
+ filename, linenum, arg);
+ if (*activep)
+ options->fingerprint_hash = value;
+ break;
+
+ case sExposeAuthInfo:
+ intptr = &options->expose_userauth_info;
+ goto parse_flag;
+
+ case sRDomain:
+#if !defined(__OpenBSD__) && !defined(HAVE_SYS_SET_PROCESS_RDOMAIN)
+ fatal("%s line %d: setting RDomain not supported on this "
+ "platform.", filename, linenum);
+#endif
+ charptr = &options->routing_domain;
+ arg = strdelim(&cp);
+ if (!arg || *arg == '\0')
+ fatal("%.200s line %d: Missing argument.",
+ filename, linenum);
+ if (strcasecmp(arg, "none") != 0 && strcmp(arg, "%D") != 0 &&
+ !valid_rdomain(arg))
+ fatal("%s line %d: bad routing domain",
+ filename, linenum);
+ if (*activep && *charptr == NULL)
+ *charptr = xstrdup(arg);
+ break;
+
+ case sDeprecated:
+ case sIgnore:
+ case sUnsupported:
+ do_log2(opcode == sIgnore ?
+ SYSLOG_LEVEL_DEBUG2 : SYSLOG_LEVEL_INFO,
+ "%s line %d: %s option %s", filename, linenum,
+ opcode == sUnsupported ? "Unsupported" : "Deprecated", arg);
+ while (arg)
+ arg = strdelim(&cp);
+ break;
+
+ default:
+ fatal("%s line %d: Missing handler for opcode %s (%d)",
+ filename, linenum, arg, opcode);
+ }
+ if ((arg = strdelim(&cp)) != NULL && *arg != '\0')
+ fatal("%s line %d: garbage at end of line; \"%.200s\".",
+ filename, linenum, arg);
+ return 0;
+}
+
+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, lineno = 0;
+
+ debug2("%s: filename %s", __func__, 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("%s: allocate failed: %s", __func__, ssh_err(r));
+ while (getline(&line, &linesize, f) != -1) {
+ lineno++;
+ /*
+ * Trim out comments and strip whitespace
+ * NB - preserve newlines, they are needed to reproduce
+ * line numbers later for error messages
+ */
+ if ((cp = strchr(line, '#')) != NULL)
+ memcpy(cp, "\n", 2);
+ cp = line + strspn(line, " \t\r");
+ if ((r = sshbuf_put(conf, cp, strlen(cp))) != 0)
+ fatal("%s: buffer error: %s", __func__, ssh_err(r));
+ }
+ free(line);
+ if ((r = sshbuf_put_u8(conf, 0)) != 0)
+ fatal("%s: buffer error: %s", __func__, ssh_err(r));
+ fclose(f);
+ debug2("%s: done config len = %zu", __func__, sshbuf_len(conf));
+}
+
+void
+parse_server_match_config(ServerOptions *options,
+ struct include_list *includes, struct connection_info *connectinfo)
+{
+ ServerOptions mo;
+
+ initialize_server_options(&mo);
+ parse_server_config(&mo, "reprocess config", cfg, includes,
+ connectinfo);
+ copy_set_server_options(options, &mo, 0);
+}
+
+int parse_server_match_testspec(struct connection_info *ci, char *spec)
+{
+ char *p;
+
+ while ((p = strsep(&spec, ",")) && *p != '\0') {
+ if (strncmp(p, "addr=", 5) == 0) {
+ ci->address = xstrdup(p + 5);
+ } else if (strncmp(p, "host=", 5) == 0) {
+ ci->host = xstrdup(p + 5);
+ } else if (strncmp(p, "user=", 5) == 0) {
+ ci->user = xstrdup(p + 5);
+ } else if (strncmp(p, "laddr=", 6) == 0) {
+ ci->laddress = xstrdup(p + 6);
+ } else if (strncmp(p, "rdomain=", 8) == 0) {
+ ci->rdomain = xstrdup(p + 8);
+ } else if (strncmp(p, "lport=", 6) == 0) {
+ ci->lport = a2port(p + 6);
+ if (ci->lport == -1) {
+ fprintf(stderr, "Invalid port '%s' in test mode"
+ " specification %s\n", p+6, p);
+ return -1;
+ }
+ } else {
+ fprintf(stderr, "Invalid test mode specification %s\n",
+ p);
+ return -1;
+ }
+ }
+ return 0;
+}
+
+/*
+ * Copy any supported values that are set.
+ *
+ * If the preauth flag is set, we do not bother copying the string or
+ * array values that are not used pre-authentication, because any that we
+ * do use must be explicitly sent in mm_getpwnamallow().
+ */
+void
+copy_set_server_options(ServerOptions *dst, ServerOptions *src, int preauth)
+{
+#define M_CP_INTOPT(n) do {\
+ if (src->n != -1) \
+ dst->n = src->n; \
+} while (0)
+
+ M_CP_INTOPT(password_authentication);
+ M_CP_INTOPT(gss_authentication);
+ M_CP_INTOPT(pubkey_authentication);
+ M_CP_INTOPT(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);
+
+ /*
+ * The bind_mask is a mode_t that may be unsigned, so we can't use
+ * M_CP_INTOPT - it does a signed comparison that causes compiler
+ * warnings.
+ */
+ if (src->fwd_opts.streamlocal_bind_mask != (mode_t)-1) {
+ dst->fwd_opts.streamlocal_bind_mask =
+ src->fwd_opts.streamlocal_bind_mask;
+ }
+
+ /* M_CP_STROPT and M_CP_STRARRAYOPT should not appear before here */
+#define M_CP_STROPT(n) do {\
+ if (src->n != NULL && dst->n != src->n) { \
+ free(dst->n); \
+ dst->n = src->n; \
+ } \
+} while(0)
+#define M_CP_STRARRAYOPT(s, num_s) do {\
+ u_int i; \
+ if (src->num_s != 0) { \
+ for (i = 0; i < dst->num_s; i++) \
+ free(dst->s[i]); \
+ free(dst->s); \
+ dst->s = xcalloc(src->num_s, sizeof(*dst->s)); \
+ for (i = 0; i < src->num_s; i++) \
+ dst->s[i] = xstrdup(src->s[i]); \
+ dst->num_s = src->num_s; \
+ } \
+} while(0)
+
+ /* See comment in servconf.h */
+ COPY_MATCH_STRING_OPTS();
+
+ /* Arguments that accept '+...' need to be expanded */
+ assemble_algorithms(dst);
+
+ /*
+ * The only things that should be below this point are string options
+ * which are only used after authentication.
+ */
+ if (preauth)
+ return;
+
+ /* These options may be "none" to clear a global setting */
+ M_CP_STROPT(adm_forced_command);
+ if (option_clear_or_none(dst->adm_forced_command)) {
+ free(dst->adm_forced_command);
+ dst->adm_forced_command = NULL;
+ }
+ M_CP_STROPT(chroot_directory);
+ if (option_clear_or_none(dst->chroot_directory)) {
+ free(dst->chroot_directory);
+ dst->chroot_directory = NULL;
+ }
+}
+
+#undef M_CP_INTOPT
+#undef M_CP_STROPT
+#undef M_CP_STRARRAYOPT
+
+#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("%s: config %s len %zu%s", __func__, filename, sshbuf_len(conf),
+ (flags & SSHCFG_NEVERMATCH ? " [checking syntax only]" : ""));
+
+ if ((obuf = cbuf = sshbuf_dup_string(conf)) == NULL)
+ fatal("%s: sshbuf_dup_string failed", __func__);
+ 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 active = connectinfo ? 0 : 1;
+ parse_server_config_depth(options, filename, conf, includes,
+ connectinfo, (connectinfo ? SSHCFG_MATCH_ONLY : 0), &active, 0);
+ 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)
+{
+ printf("%s %d\n", lookup_opcode_name(code), val);
+}
+
+static void
+dump_cfg_oct(ServerOpCodes code, int val)
+{
+ printf("%s 0%o\n", lookup_opcode_name(code), val);
+}
+
+static void
+dump_cfg_fmtint(ServerOpCodes code, int val)
+{
+ printf("%s %s\n", lookup_opcode_name(code), fmt_intarg(code, val));
+}
+
+static void
+dump_cfg_string(ServerOpCodes code, const char *val)
+{
+ printf("%s %s\n", lookup_opcode_name(code),
+ val == NULL ? "none" : val);
+}
+
+static void
+dump_cfg_strarray(ServerOpCodes code, u_int count, char **vals)
+{
+ u_int i;
+
+ for (i = 0; i < count; i++)
+ printf("%s %s\n", lookup_opcode_name(code), vals[i]);
+}
+
+static void
+dump_cfg_strarray_oneline(ServerOpCodes code, u_int count, char **vals)
+{
+ u_int i;
+
+ if (count <= 0 && code != sAuthenticationMethods)
+ return;
+ printf("%s", lookup_opcode_name(code));
+ for (i = 0; i < count; i++)
+ printf(" %s", vals[i]);
+ if (code == sAuthenticationMethods && count == 0)
+ printf(" any");
+ printf("\n");
+}
+
+static char *
+format_listen_addrs(struct listenaddr *la)
+{
+ int r;
+ struct addrinfo *ai;
+ char addr[NI_MAXHOST], port[NI_MAXSERV];
+ char *laddr1 = xstrdup(""), *laddr2 = NULL;
+
+ /*
+ * ListenAddress must be after Port. add_one_listen_addr pushes
+ * addresses onto a stack, so to maintain ordering we need to
+ * print these in reverse order.
+ */
+ for (ai = la->addrs; ai; ai = ai->ai_next) {
+ if ((r = getnameinfo(ai->ai_addr, ai->ai_addrlen, addr,
+ sizeof(addr), port, sizeof(port),
+ NI_NUMERICHOST|NI_NUMERICSERV)) != 0) {
+ error("getnameinfo: %.100s", ssh_gai_strerror(r));
+ continue;
+ }
+ laddr2 = laddr1;
+ if (ai->ai_family == AF_INET6) {
+ xasprintf(&laddr1, "listenaddress [%s]:%s%s%s\n%s",
+ addr, port,
+ la->rdomain == NULL ? "" : " rdomain ",
+ la->rdomain == NULL ? "" : la->rdomain,
+ laddr2);
+ } else {
+ xasprintf(&laddr1, "listenaddress %s:%s%s%s\n%s",
+ addr, port,
+ la->rdomain == NULL ? "" : " rdomain ",
+ la->rdomain == NULL ? "" : la->rdomain,
+ laddr2);
+ }
+ free(laddr2);
+ }
+ return laddr1;
+}
+
+void
+dump_config(ServerOptions *o)
+{
+ char *s;
+ u_int i;
+
+ /* these are usually at the top of the config */
+ for (i = 0; i < o->num_ports; i++)
+ printf("port %d\n", o->ports[i]);
+ dump_cfg_fmtint(sAddressFamily, o->address_family);
+
+ for (i = 0; i < o->num_listen_addrs; i++) {
+ s = format_listen_addrs(&o->listen_addrs[i]);
+ printf("%s", s);
+ free(s);
+ }
+
+ /* integer arguments */
+#ifdef USE_PAM
+ dump_cfg_fmtint(sUsePAM, o->use_pam);
+#endif
+ dump_cfg_int(sLoginGraceTime, o->login_grace_time);
+ dump_cfg_int(sX11DisplayOffset, o->x11_display_offset);
+ dump_cfg_int(sMaxAuthTries, o->max_authtries);
+ dump_cfg_int(sMaxSessions, o->max_sessions);
+ dump_cfg_int(sClientAliveInterval, o->client_alive_interval);
+ dump_cfg_int(sClientAliveCountMax, o->client_alive_count_max);
+ dump_cfg_oct(sStreamLocalBindMask, o->fwd_opts.streamlocal_bind_mask);
+
+ /* formatted integer arguments */
+ dump_cfg_fmtint(sPermitRootLogin, o->permit_root_login);
+ dump_cfg_fmtint(sIgnoreRhosts, o->ignore_rhosts);
+ dump_cfg_fmtint(sIgnoreUserKnownHosts, o->ignore_user_known_hosts);
+ dump_cfg_fmtint(sHostbasedAuthentication, o->hostbased_authentication);
+ dump_cfg_fmtint(sHostbasedUsesNameFromPacketOnly,
+ o->hostbased_uses_name_from_packet_only);
+ dump_cfg_fmtint(sPubkeyAuthentication, o->pubkey_authentication);
+#ifdef KRB5
+ dump_cfg_fmtint(sKerberosAuthentication, o->kerberos_authentication);
+ dump_cfg_fmtint(sKerberosOrLocalPasswd, o->kerberos_or_local_passwd);
+ dump_cfg_fmtint(sKerberosTicketCleanup, o->kerberos_ticket_cleanup);
+# ifdef USE_AFS
+ dump_cfg_fmtint(sKerberosGetAFSToken, o->kerberos_get_afs_token);
+# endif
+#endif
+#ifdef GSSAPI
+ dump_cfg_fmtint(sGssAuthentication, o->gss_authentication);
+ dump_cfg_fmtint(sGssCleanupCreds, o->gss_cleanup_creds);
+#endif
+ dump_cfg_fmtint(sPasswordAuthentication, o->password_authentication);
+ dump_cfg_fmtint(sKbdInteractiveAuthentication,
+ o->kbd_interactive_authentication);
+ dump_cfg_fmtint(sChallengeResponseAuthentication,
+ o->challenge_response_authentication);
+ dump_cfg_fmtint(sPrintMotd, o->print_motd);
+#ifndef DISABLE_LASTLOG
+ dump_cfg_fmtint(sPrintLastLog, o->print_lastlog);
+#endif
+ dump_cfg_fmtint(sX11Forwarding, o->x11_forwarding);
+ dump_cfg_fmtint(sX11UseLocalhost, o->x11_use_localhost);
+ dump_cfg_fmtint(sPermitTTY, o->permit_tty);
+ dump_cfg_fmtint(sPermitUserRC, o->permit_user_rc);
+ dump_cfg_fmtint(sStrictModes, o->strict_modes);
+ dump_cfg_fmtint(sTCPKeepAlive, o->tcp_keep_alive);
+ dump_cfg_fmtint(sEmptyPasswd, o->permit_empty_passwd);
+ dump_cfg_fmtint(sCompression, o->compression);
+ dump_cfg_fmtint(sGatewayPorts, o->fwd_opts.gateway_ports);
+ dump_cfg_fmtint(sUseDNS, o->use_dns);
+ dump_cfg_fmtint(sAllowTcpForwarding, o->allow_tcp_forwarding);
+ dump_cfg_fmtint(sAllowAgentForwarding, o->allow_agent_forwarding);
+ dump_cfg_fmtint(sDisableForwarding, o->disable_forwarding);
+ dump_cfg_fmtint(sAllowStreamLocalForwarding, o->allow_streamlocal_forwarding);
+ dump_cfg_fmtint(sStreamLocalBindUnlink, o->fwd_opts.streamlocal_bind_unlink);
+ dump_cfg_fmtint(sFingerprintHash, o->fingerprint_hash);
+ dump_cfg_fmtint(sExposeAuthInfo, o->expose_userauth_info);
+
+ /* string arguments */
+ dump_cfg_string(sPidFile, o->pid_file);
+ dump_cfg_string(sXAuthLocation, o->xauth_location);
+ dump_cfg_string(sCiphers, o->ciphers);
+ 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(sHostbasedAcceptedKeyTypes, o->hostbased_key_types);
+ dump_cfg_string(sHostKeyAlgorithms, o->hostkeyalgorithms);
+ dump_cfg_string(sPubkeyAcceptedKeyTypes, o->pubkey_key_types);
+#if defined(__OpenBSD__) || defined(HAVE_SYS_SET_PROCESS_RDOMAIN)
+ dump_cfg_string(sRDomain, o->routing_domain);
+#endif
+
+ /* string arguments requiring a lookup */
+ dump_cfg_string(sLogLevel, log_level_name(o->log_level));
+ dump_cfg_string(sLogFacility, log_facility_name(o->log_facility));
+
+ /* string array arguments */
+ dump_cfg_strarray_oneline(sAuthorizedKeysFile, o->num_authkeys_files,
+ o->authorized_keys_files);
+ dump_cfg_strarray(sHostKeyFile, o->num_host_key_files,
+ o->host_key_files);
+ dump_cfg_strarray(sHostCertificate, o->num_host_cert_files,
+ o->host_cert_files);
+ dump_cfg_strarray(sAllowUsers, o->num_allow_users, o->allow_users);
+ dump_cfg_strarray(sDenyUsers, o->num_deny_users, o->deny_users);
+ dump_cfg_strarray(sAllowGroups, o->num_allow_groups, o->allow_groups);
+ dump_cfg_strarray(sDenyGroups, o->num_deny_groups, o->deny_groups);
+ dump_cfg_strarray(sAcceptEnv, o->num_accept_env, o->accept_env);
+ dump_cfg_strarray(sSetEnv, o->num_setenv, o->setenv);
+ dump_cfg_strarray_oneline(sAuthenticationMethods,
+ o->num_auth_methods, o->auth_methods);
+
+ /* other arguments */
+ for (i = 0; i < o->num_subsystems; i++)
+ printf("subsystem %s %s\n", o->subsystem_name[i],
+ o->subsystem_args[i]);
+
+ printf("maxstartups %d:%d:%d\n", o->max_startups_begin,
+ o->max_startups_rate, o->max_startups);
+
+ s = NULL;
+ for (i = 0; tunmode_desc[i].val != -1; i++) {
+ if (tunmode_desc[i].val == o->permit_tun) {
+ s = tunmode_desc[i].text;
+ break;
+ }
+ }
+ dump_cfg_string(sPermitTunnel, s);
+
+ printf("ipqos %s ", iptos2str(o->ip_qos_interactive));
+ printf("%s\n", iptos2str(o->ip_qos_bulk));
+
+ printf("rekeylimit %llu %d\n", (unsigned long long)o->rekey_limit,
+ o->rekey_interval);
+
+ printf("permitopen");
+ if (o->num_permitted_opens == 0)
+ printf(" any");
+ else {
+ for (i = 0; i < o->num_permitted_opens; i++)
+ printf(" %s", o->permitted_opens[i]);
+ }
+ printf("\n");
+ printf("permitlisten");
+ if (o->num_permitted_listens == 0)
+ printf(" any");
+ else {
+ for (i = 0; i < o->num_permitted_listens; i++)
+ printf(" %s", o->permitted_listens[i]);
+ }
+ printf("\n");
+
+ if (o->permit_user_env_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");
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-01 09:19:40 +0000