readconf.c
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readconf.c
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	/* $OpenBSD: readconf.c,v 1.380 2023/07/17 06:16:33 djm Exp $ */
	/*
	* Author: Tatu Ylonen <ylo@cs.hut.fi>
	* Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
	* All rights reserved
	* Functions for reading the configuration files.
	*
	* 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/stat.h>
	#include <sys/socket.h>
	#include <sys/wait.h>
	#include <sys/un.h>

	#include <net/if.h>
	#include <netinet/in.h>
	#include <netinet/in_systm.h>
	#include <netinet/ip.h>
	#include <arpa/inet.h>

	#include <ctype.h>
	#include <errno.h>
	#include <fcntl.h>
	#ifdef HAVE_IFADDRS_H
	# include <ifaddrs.h>
	#endif
	#include <limits.h>
	#include <netdb.h>
	#ifdef HAVE_PATHS_H
	# include <paths.h>
	#endif
	#include <pwd.h>
	#include <signal.h>
	#include <stdio.h>
	#include <string.h>
	#include <stdarg.h>
	#include <unistd.h>
	#ifdef USE_SYSTEM_GLOB
	# include <glob.h>
	#else
	# include "openbsd-compat/glob.h"
	#endif
	#ifdef HAVE_UTIL_H
	#include <util.h>
	#endif
	#if defined(HAVE_STRNVIS) && defined(HAVE_VIS_H) && !defined(BROKEN_STRNVIS)
	# include <vis.h>
	#endif

	#include "xmalloc.h"
	#include "ssh.h"
	#include "ssherr.h"
	#include "cipher.h"
	#include "pathnames.h"
	#include "log.h"
	#include "sshkey.h"
	#include "misc.h"
	#include "readconf.h"
	#include "match.h"
	#include "kex.h"
	#include "mac.h"
	#include "uidswap.h"
	#include "myproposal.h"
	#include "digest.h"

	/* Format of the configuration file:

	# Configuration data is parsed as follows:
	# 1. command line options
	# 2. user-specific file
	# 3. system-wide file
	# Any configuration value is only changed the first time it is set.
	# Thus, host-specific definitions should be at the beginning of the
	# configuration file, and defaults at the end.

	# Host-specific declarations. These may override anything above. A single
	# host may match multiple declarations; these are processed in the order
	# that they are given in.

	Host *.ngs.fi ngs.fi
	User foo

	Host fake.com
	Hostname another.host.name.real.org
	User blaah
	Port 34289
	ForwardX11 no
	ForwardAgent no

	Host books.com
	RemoteForward 9999 shadows.cs.hut.fi:9999
	Ciphers 3des-cbc

	Host fascist.blob.com
	Port 23123
	User tylonen
	PasswordAuthentication no

	Host puukko.hut.fi
	User t35124p
	ProxyCommand ssh-proxy %h %p

	Host *.fr
	PublicKeyAuthentication no

	Host *.su
	Ciphers aes128-ctr
	PasswordAuthentication no

	Host vpn.fake.com
	Tunnel yes
	TunnelDevice 3

	# Defaults for various options
	Host *
	ForwardAgent no
	ForwardX11 no
	PasswordAuthentication yes
	StrictHostKeyChecking yes
	TcpKeepAlive no
	IdentityFile ~/.ssh/identity
	Port 22
	EscapeChar ~

	*/

	static int read_config_file_depth(const char filename, struct passwd pw,
	const char host, const char original_host, Options *options,
	int flags, int activep, int want_final_pass, int depth);
	static int process_config_line_depth(Options options, struct passwd pw,
	const char host, const char original_host, char *line,
	const char filename, int linenum, int activep, int flags,
	int *want_final_pass, int depth);

	/* Keyword tokens. */

	typedef enum {
	oBadOption,
	oHost, oMatch, oInclude, oTag,
	oForwardAgent, oForwardX11, oForwardX11Trusted, oForwardX11Timeout,
	oGatewayPorts, oExitOnForwardFailure,
	oPasswordAuthentication,
	oXAuthLocation,
	oIdentityFile, oHostname, oPort, oRemoteForward, oLocalForward,
	oPermitRemoteOpen,
	oCertificateFile, oAddKeysToAgent, oIdentityAgent,
	oUser, oEscapeChar, oProxyCommand,
	oGlobalKnownHostsFile, oUserKnownHostsFile, oConnectionAttempts,
	oBatchMode, oCheckHostIP, oStrictHostKeyChecking, oCompression,
	oTCPKeepAlive, oNumberOfPasswordPrompts,
	oLogFacility, oLogLevel, oLogVerbose, oCiphers, oMacs,
	oPubkeyAuthentication,
	oKbdInteractiveAuthentication, oKbdInteractiveDevices, oHostKeyAlias,
	oDynamicForward, oPreferredAuthentications, oHostbasedAuthentication,
	oHostKeyAlgorithms, oBindAddress, oBindInterface, oPKCS11Provider,
	oClearAllForwardings, oNoHostAuthenticationForLocalhost,
	oEnableSSHKeysign, oRekeyLimit, oVerifyHostKeyDNS, oConnectTimeout,
	oAddressFamily, oGssAuthentication, oGssDelegateCreds,
	oServerAliveInterval, oServerAliveCountMax, oIdentitiesOnly,
	oSendEnv, oSetEnv, oControlPath, oControlMaster, oControlPersist,
	oHashKnownHosts,
	oTunnel, oTunnelDevice,
	oLocalCommand, oPermitLocalCommand, oRemoteCommand,
	oVisualHostKey,
	oKexAlgorithms, oIPQoS, oRequestTTY, oSessionType, oStdinNull,
	oForkAfterAuthentication, oIgnoreUnknown, oProxyUseFdpass,
	oCanonicalDomains, oCanonicalizeHostname, oCanonicalizeMaxDots,
	oCanonicalizeFallbackLocal, oCanonicalizePermittedCNAMEs,
	oStreamLocalBindMask, oStreamLocalBindUnlink, oRevokedHostKeys,
	oFingerprintHash, oUpdateHostkeys, oHostbasedAcceptedAlgorithms,
	oPubkeyAcceptedAlgorithms, oCASignatureAlgorithms, oProxyJump,
	oSecurityKeyProvider, oKnownHostsCommand, oRequiredRSASize,
	oEnableEscapeCommandline,
	oIgnore, oIgnoredUnknownOption, oDeprecated, oUnsupported
	} OpCodes;

	/* Textual representations of the tokens. */

	static struct {
	const char *name;
	OpCodes opcode;
	} keywords[] = {
	/* Deprecated options */
	{ "protocol", oIgnore }, /* NB. silently ignored */
	{ "cipher", oDeprecated },
	{ "fallbacktorsh", oDeprecated },
	{ "globalknownhostsfile2", oDeprecated },
	{ "rhostsauthentication", oDeprecated },
	{ "userknownhostsfile2", oDeprecated },
	{ "useroaming", oDeprecated },
	{ "usersh", oDeprecated },
	{ "useprivilegedport", oDeprecated },

	/* Unsupported options */
	{ "afstokenpassing", oUnsupported },
	{ "kerberosauthentication", oUnsupported },
	{ "kerberostgtpassing", oUnsupported },
	{ "rsaauthentication", oUnsupported },
	{ "rhostsrsaauthentication", oUnsupported },
	{ "compressionlevel", oUnsupported },

	/* Sometimes-unsupported options */
	#if defined(GSSAPI)
	{ "gssapiauthentication", oGssAuthentication },
	{ "gssapidelegatecredentials", oGssDelegateCreds },
	# else
	{ "gssapiauthentication", oUnsupported },
	{ "gssapidelegatecredentials", oUnsupported },
	#endif
	#ifdef ENABLE_PKCS11
	{ "pkcs11provider", oPKCS11Provider },
	{ "smartcarddevice", oPKCS11Provider },
	# else
	{ "smartcarddevice", oUnsupported },
	{ "pkcs11provider", oUnsupported },
	#endif

	{ "forwardagent", oForwardAgent },
	{ "forwardx11", oForwardX11 },
	{ "forwardx11trusted", oForwardX11Trusted },
	{ "forwardx11timeout", oForwardX11Timeout },
	{ "exitonforwardfailure", oExitOnForwardFailure },
	{ "xauthlocation", oXAuthLocation },
	{ "gatewayports", oGatewayPorts },
	{ "passwordauthentication", oPasswordAuthentication },
	{ "kbdinteractiveauthentication", oKbdInteractiveAuthentication },
	{ "kbdinteractivedevices", oKbdInteractiveDevices },
	{ "challengeresponseauthentication", oKbdInteractiveAuthentication }, /* alias */
	{ "skeyauthentication", oKbdInteractiveAuthentication }, /* alias */
	{ "tisauthentication", oKbdInteractiveAuthentication }, /* alias */
	{ "pubkeyauthentication", oPubkeyAuthentication },
	{ "dsaauthentication", oPubkeyAuthentication }, /* alias */
	{ "hostbasedauthentication", oHostbasedAuthentication },
	{ "identityfile", oIdentityFile },
	{ "identityfile2", oIdentityFile }, /* obsolete */
	{ "identitiesonly", oIdentitiesOnly },
	{ "certificatefile", oCertificateFile },
	{ "addkeystoagent", oAddKeysToAgent },
	{ "identityagent", oIdentityAgent },
	{ "hostname", oHostname },
	{ "hostkeyalias", oHostKeyAlias },
	{ "proxycommand", oProxyCommand },
	{ "port", oPort },
	{ "ciphers", oCiphers },
	{ "macs", oMacs },
	{ "remoteforward", oRemoteForward },
	{ "localforward", oLocalForward },
	{ "permitremoteopen", oPermitRemoteOpen },
	{ "user", oUser },
	{ "host", oHost },
	{ "match", oMatch },
	{ "tag", oTag },
	{ "escapechar", oEscapeChar },
	{ "globalknownhostsfile", oGlobalKnownHostsFile },
	{ "userknownhostsfile", oUserKnownHostsFile },
	{ "connectionattempts", oConnectionAttempts },
	{ "batchmode", oBatchMode },
	{ "checkhostip", oCheckHostIP },
	{ "stricthostkeychecking", oStrictHostKeyChecking },
	{ "compression", oCompression },
	{ "tcpkeepalive", oTCPKeepAlive },
	{ "keepalive", oTCPKeepAlive }, /* obsolete */
	{ "numberofpasswordprompts", oNumberOfPasswordPrompts },
	{ "syslogfacility", oLogFacility },
	{ "loglevel", oLogLevel },
	{ "logverbose", oLogVerbose },
	{ "dynamicforward", oDynamicForward },
	{ "preferredauthentications", oPreferredAuthentications },
	{ "hostkeyalgorithms", oHostKeyAlgorithms },
	{ "casignaturealgorithms", oCASignatureAlgorithms },
	{ "bindaddress", oBindAddress },
	{ "bindinterface", oBindInterface },
	{ "clearallforwardings", oClearAllForwardings },
	{ "enablesshkeysign", oEnableSSHKeysign },
	{ "verifyhostkeydns", oVerifyHostKeyDNS },
	{ "nohostauthenticationforlocalhost", oNoHostAuthenticationForLocalhost },
	{ "rekeylimit", oRekeyLimit },
	{ "connecttimeout", oConnectTimeout },
	{ "addressfamily", oAddressFamily },
	{ "serveraliveinterval", oServerAliveInterval },
	{ "serveralivecountmax", oServerAliveCountMax },
	{ "sendenv", oSendEnv },
	{ "setenv", oSetEnv },
	{ "controlpath", oControlPath },
	{ "controlmaster", oControlMaster },
	{ "controlpersist", oControlPersist },
	{ "hashknownhosts", oHashKnownHosts },
	{ "include", oInclude },
	{ "tunnel", oTunnel },
	{ "tunneldevice", oTunnelDevice },
	{ "localcommand", oLocalCommand },
	{ "permitlocalcommand", oPermitLocalCommand },
	{ "remotecommand", oRemoteCommand },
	{ "visualhostkey", oVisualHostKey },
	{ "kexalgorithms", oKexAlgorithms },
	{ "ipqos", oIPQoS },
	{ "requesttty", oRequestTTY },
	{ "sessiontype", oSessionType },
	{ "stdinnull", oStdinNull },
	{ "forkafterauthentication", oForkAfterAuthentication },
	{ "proxyusefdpass", oProxyUseFdpass },
	{ "canonicaldomains", oCanonicalDomains },
	{ "canonicalizefallbacklocal", oCanonicalizeFallbackLocal },
	{ "canonicalizehostname", oCanonicalizeHostname },
	{ "canonicalizemaxdots", oCanonicalizeMaxDots },
	{ "canonicalizepermittedcnames", oCanonicalizePermittedCNAMEs },
	{ "streamlocalbindmask", oStreamLocalBindMask },
	{ "streamlocalbindunlink", oStreamLocalBindUnlink },
	{ "revokedhostkeys", oRevokedHostKeys },
	{ "fingerprinthash", oFingerprintHash },
	{ "updatehostkeys", oUpdateHostkeys },
	{ "hostbasedacceptedalgorithms", oHostbasedAcceptedAlgorithms },
	{ "hostbasedkeytypes", oHostbasedAcceptedAlgorithms }, /* obsolete */
	{ "pubkeyacceptedalgorithms", oPubkeyAcceptedAlgorithms },
	{ "pubkeyacceptedkeytypes", oPubkeyAcceptedAlgorithms }, /* obsolete */
	{ "ignoreunknown", oIgnoreUnknown },
	{ "proxyjump", oProxyJump },
	{ "securitykeyprovider", oSecurityKeyProvider },
	{ "knownhostscommand", oKnownHostsCommand },
	{ "requiredrsasize", oRequiredRSASize },
	{ "enableescapecommandline", oEnableEscapeCommandline },

	/* Client VersionAddendum - retired in bffe60ead024 */
	{ "versionaddendum", oDeprecated },

	{ NULL, oBadOption }
	};

	static const char *lookup_opcode_name(OpCodes code);

	const char *
	kex_default_pk_alg(void)
	{
	static char *pkalgs;

	if (pkalgs == NULL) {
	char *all_key;

	all_key = sshkey_alg_list(0, 0, 1, ',');
	pkalgs = match_filter_allowlist(KEX_DEFAULT_PK_ALG, all_key);
	free(all_key);
	}
	return pkalgs;
	}

	char *
	ssh_connection_hash(const char thishost, const char host, const char *portstr,
	const char *user)
	{
	struct ssh_digest_ctx *md;
	u_char conn_hash[SSH_DIGEST_MAX_LENGTH];

	if ((md = ssh_digest_start(SSH_DIGEST_SHA1)) == NULL \|\|
	ssh_digest_update(md, thishost, strlen(thishost)) < 0 \|\|
	ssh_digest_update(md, host, strlen(host)) < 0 \|\|
	ssh_digest_update(md, portstr, strlen(portstr)) < 0 \|\|
	ssh_digest_update(md, user, strlen(user)) < 0 \|\|
	ssh_digest_final(md, conn_hash, sizeof(conn_hash)) < 0)
	fatal_f("mux digest failed");
	ssh_digest_free(md);
	return tohex(conn_hash, ssh_digest_bytes(SSH_DIGEST_SHA1));
	}

	/*
	* Adds a local TCP/IP port forward to options. Never returns if there is an
	* error.
	*/

	void
	add_local_forward(Options options, const struct Forward newfwd)
	{
	struct Forward *fwd;
	int i;

	/* Don't add duplicates */
	for (i = 0; i < options->num_local_forwards; i++) {
	if (forward_equals(newfwd, options->local_forwards + i))
	return;
	}
	options->local_forwards = xreallocarray(options->local_forwards,
	options->num_local_forwards + 1,
	sizeof(*options->local_forwards));
	fwd = &options->local_forwards[options->num_local_forwards++];

	fwd->listen_host = newfwd->listen_host;
	fwd->listen_port = newfwd->listen_port;
	fwd->listen_path = newfwd->listen_path;
	fwd->connect_host = newfwd->connect_host;
	fwd->connect_port = newfwd->connect_port;
	fwd->connect_path = newfwd->connect_path;
	}

	/*
	* Adds a remote TCP/IP port forward to options. Never returns if there is
	* an error.
	*/

	void
	add_remote_forward(Options options, const struct Forward newfwd)
	{
	struct Forward *fwd;
	int i;

	/* Don't add duplicates */
	for (i = 0; i < options->num_remote_forwards; i++) {
	if (forward_equals(newfwd, options->remote_forwards + i))
	return;
	}
	options->remote_forwards = xreallocarray(options->remote_forwards,
	options->num_remote_forwards + 1,
	sizeof(*options->remote_forwards));
	fwd = &options->remote_forwards[options->num_remote_forwards++];

	fwd->listen_host = newfwd->listen_host;
	fwd->listen_port = newfwd->listen_port;
	fwd->listen_path = newfwd->listen_path;
	fwd->connect_host = newfwd->connect_host;
	fwd->connect_port = newfwd->connect_port;
	fwd->connect_path = newfwd->connect_path;
	fwd->handle = newfwd->handle;
	fwd->allocated_port = 0;
	}

	static void
	clear_forwardings(Options *options)
	{
	int i;

	for (i = 0; i < options->num_local_forwards; i++) {
	free(options->local_forwards[i].listen_host);
	free(options->local_forwards[i].listen_path);
	free(options->local_forwards[i].connect_host);
	free(options->local_forwards[i].connect_path);
	}
	if (options->num_local_forwards > 0) {
	free(options->local_forwards);
	options->local_forwards = NULL;
	}
	options->num_local_forwards = 0;
	for (i = 0; i < options->num_remote_forwards; i++) {
	free(options->remote_forwards[i].listen_host);
	free(options->remote_forwards[i].listen_path);
	free(options->remote_forwards[i].connect_host);
	free(options->remote_forwards[i].connect_path);
	}
	if (options->num_remote_forwards > 0) {
	free(options->remote_forwards);
	options->remote_forwards = NULL;
	}
	options->num_remote_forwards = 0;
	options->tun_open = SSH_TUNMODE_NO;
	}

	void
	add_certificate_file(Options options, const char path, int userprovided)
	{
	int i;

	if (options->num_certificate_files >= SSH_MAX_CERTIFICATE_FILES)
	fatal("Too many certificate files specified (max %d)",
	SSH_MAX_CERTIFICATE_FILES);

	/* Avoid registering duplicates */
	for (i = 0; i < options->num_certificate_files; i++) {
	if (options->certificate_file_userprovided[i] == userprovided &&
	strcmp(options->certificate_files[i], path) == 0) {
	debug2_f("ignoring duplicate key %s", path);
	return;
	}
	}

	options->certificate_file_userprovided[options->num_certificate_files] =
	userprovided;
	options->certificate_files[options->num_certificate_files++] =
	xstrdup(path);
	}

	void
	add_identity_file(Options options, const char dir, const char *filename,
	int userprovided)
	{
	char *path;
	int i;

	if (options->num_identity_files >= SSH_MAX_IDENTITY_FILES)
	fatal("Too many identity files specified (max %d)",
	SSH_MAX_IDENTITY_FILES);

	if (dir == NULL) /* no dir, filename is absolute */
	path = xstrdup(filename);
	else if (xasprintf(&path, "%s%s", dir, filename) >= PATH_MAX)
	fatal("Identity file path %s too long", path);

	/* Avoid registering duplicates */
	for (i = 0; i < options->num_identity_files; i++) {
	if (options->identity_file_userprovided[i] == userprovided &&
	strcmp(options->identity_files[i], path) == 0) {
	debug2_f("ignoring duplicate key %s", path);
	free(path);
	return;
	}
	}

	options->identity_file_userprovided[options->num_identity_files] =
	userprovided;
	options->identity_files[options->num_identity_files++] = path;
	}

	int
	default_ssh_port(void)
	{
	static int port;
	struct servent *sp;

	if (port == 0) {
	sp = getservbyname(SSH_SERVICE_NAME, "tcp");
	port = sp ? ntohs(sp->s_port) : SSH_DEFAULT_PORT;
	}
	return port;
	}

	/*
	* Execute a command in a shell.
	* Return its exit status or -1 on abnormal exit.
	*/
	static int
	execute_in_shell(const char *cmd)
	{
	char *shell;
	pid_t pid;
	int status;

	if ((shell = getenv("SHELL")) == NULL)
	shell = _PATH_BSHELL;

	if (access(shell, X_OK) == -1) {
	fatal("Shell \"%s\" is not executable: %s",
	shell, strerror(errno));
	}

	debug("Executing command: '%.500s'", cmd);

	/* Fork and execute the command. */
	if ((pid = fork()) == 0) {
	char *argv[4];

	if (stdfd_devnull(1, 1, 0) == -1)
	fatal_f("stdfd_devnull failed");
	closefrom(STDERR_FILENO + 1);

	argv[0] = shell;
	argv[1] = "-c";
	argv[2] = xstrdup(cmd);
	argv[3] = NULL;

	execv(argv[0], argv);
	error("Unable to execute '%.100s': %s", cmd, strerror(errno));
	/* Die with signal to make this error apparent to parent. */
	ssh_signal(SIGTERM, SIG_DFL);
	kill(getpid(), SIGTERM);
	_exit(1);
	}
	/* Parent. */
	if (pid == -1)
	fatal_f("fork: %.100s", strerror(errno));

	while (waitpid(pid, &status, 0) == -1) {
	if (errno != EINTR && errno != EAGAIN)
	fatal_f("waitpid: %s", strerror(errno));
	}
	if (!WIFEXITED(status)) {
	error("command '%.100s' exited abnormally", cmd);
	return -1;
	}
	debug3("command returned status %d", WEXITSTATUS(status));
	return WEXITSTATUS(status);
	}

	/*
	* Check whether a local network interface address appears in CIDR pattern-
	* list 'addrlist'. Returns 1 if matched or 0 otherwise.
	*/
	static int
	check_match_ifaddrs(const char *addrlist)
	{
	#ifdef HAVE_IFADDRS_H
	struct ifaddrs ifa, ifaddrs = NULL;
	int r, found = 0;
	char addr[NI_MAXHOST];
	socklen_t salen;

	if (getifaddrs(&ifaddrs) != 0) {
	error("match localnetwork: getifaddrs failed: %s",
	strerror(errno));
	return 0;
	}
	for (ifa = ifaddrs; ifa != NULL; ifa = ifa->ifa_next) {
	if (ifa->ifa_addr == NULL \|\| ifa->ifa_name == NULL \|\|
	(ifa->ifa_flags & IFF_UP) == 0)
	continue;
	switch (ifa->ifa_addr->sa_family) {
	case AF_INET:
	salen = sizeof(struct sockaddr_in);
	break;
	case AF_INET6:
	salen = sizeof(struct sockaddr_in6);
	break;
	#ifdef AF_LINK
	case AF_LINK:
	/* ignore */
	continue;
	#endif /* AF_LINK */
	default:
	debug2_f("interface %s: unsupported address family %d",
	ifa->ifa_name, ifa->ifa_addr->sa_family);
	continue;
	}
	if ((r = getnameinfo(ifa->ifa_addr, salen, addr, sizeof(addr),
	NULL, 0, NI_NUMERICHOST)) != 0) {
	debug2_f("interface %s getnameinfo failed: %s",
	ifa->ifa_name, gai_strerror(r));
	continue;
	}
	debug3_f("interface %s addr %s", ifa->ifa_name, addr);
	if (addr_match_cidr_list(addr, addrlist) == 1) {
	debug3_f("matched interface %s: address %s in %s",
	ifa->ifa_name, addr, addrlist);
	found = 1;
	break;
	}
	}
	freeifaddrs(ifaddrs);
	return found;
	#else /* HAVE_IFADDRS_H */
	error("match localnetwork: not supported on this platform");
	return 0;
	#endif /* HAVE_IFADDRS_H */
	}

	/*
	* Parse and execute a Match directive.
	*/
	static int
	match_cfg_line(Options options, char condition, struct passwd pw,
	const char host_arg, const char original_host, int final_pass,
	int want_final_pass, const char filename, int linenum)
	{
	char arg, oattrib, attrib, cmd, cp = condition, host, criteria;
	const char *ruser;
	int r, port, this_result, result = 1, attributes = 0, negate;
	char thishost[NI_MAXHOST], shorthost[NI_MAXHOST], portstr[NI_MAXSERV];
	char uidstr[32];

	/*
	* Configuration is likely to be incomplete at this point so we
	* must be prepared to use default values.
	*/
	port = options->port <= 0 ? default_ssh_port() : options->port;
	ruser = options->user == NULL ? pw->pw_name : options->user;
	if (final_pass) {
	host = xstrdup(options->hostname);
	} else if (options->hostname != NULL) {
	/* NB. Please keep in sync with ssh.c:main() */
	host = percent_expand(options->hostname,
	"h", host_arg, (char *)NULL);
	} else {
	host = xstrdup(host_arg);
	}

	debug2("checking match for '%s' host %s originally %s",
	cp, host, original_host);
	while ((oattrib = attrib = strdelim(&cp)) && *attrib != '\0') {
	/* Terminate on comment */
	if (*attrib == '#') {
	cp = NULL; /* mark all arguments consumed */
	break;
	}
	arg = criteria = NULL;
	this_result = 1;
	if ((negate = (attrib[0] == '!')))
	attrib++;
	/* 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("%.200s line %d: '%s' cannot be combined "
	"with other Match attributes",
	filename, linenum, oattrib);
	result = -1;
	goto out;
	}
	if (arg != NULL && *arg == '#')
	cp = NULL; /* mark all arguments consumed */
	if (result)
	result = negate ? 0 : 1;
	goto out;
	}
	attributes++;
	/* criteria "final" and "canonical" have no argument */
	if (strcasecmp(attrib, "canonical") == 0 \|\|
	strcasecmp(attrib, "final") == 0) {
	/*
	* If the config requests "Match final" then remember
	* this so we can perform a second pass later.
	*/
	if (strcasecmp(attrib, "final") == 0 &&
	want_final_pass != NULL)
	*want_final_pass = 1;
	r = !!final_pass; /* force bitmask member to boolean */
	if (r == (negate ? 1 : 0))
	this_result = result = 0;
	debug3("%.200s line %d: %smatched '%s'",
	filename, linenum,
	this_result ? "" : "not ", oattrib);
	continue;
	}
	/* All other criteria require an argument */
	if ((arg = strdelim(&cp)) == NULL \|\|
	arg == '\0' \|\| arg == '#') {
	error("Missing Match criteria for %s", attrib);
	result = -1;
	goto out;
	}
	if (strcasecmp(attrib, "host") == 0) {
	criteria = xstrdup(host);
	r = match_hostname(host, arg) == 1;
	if (r == (negate ? 1 : 0))
	this_result = result = 0;
	} else if (strcasecmp(attrib, "originalhost") == 0) {
	criteria = xstrdup(original_host);
	r = match_hostname(original_host, arg) == 1;
	if (r == (negate ? 1 : 0))
	this_result = result = 0;
	} else if (strcasecmp(attrib, "user") == 0) {
	criteria = xstrdup(ruser);
	r = match_pattern_list(ruser, arg, 0) == 1;
	if (r == (negate ? 1 : 0))
	this_result = result = 0;
	} else if (strcasecmp(attrib, "localuser") == 0) {
	criteria = xstrdup(pw->pw_name);
	r = match_pattern_list(pw->pw_name, arg, 0) == 1;
	if (r == (negate ? 1 : 0))
	this_result = result = 0;
	} else if (strcasecmp(attrib, "localnetwork") == 0) {
	if (addr_match_cidr_list(NULL, arg) == -1) {
	/* Error already printed */
	result = -1;
	goto out;
	}
	r = check_match_ifaddrs(arg) == 1;
	if (r == (negate ? 1 : 0))
	this_result = result = 0;
	} else if (strcasecmp(attrib, "tagged") == 0) {
	criteria = xstrdup(options->tag == NULL ? "" :
	options->tag);
	r = match_pattern_list(criteria, arg, 0) == 1;
	if (r == (negate ? 1 : 0))
	this_result = result = 0;
	} else if (strcasecmp(attrib, "exec") == 0) {
	char conn_hash_hex, keyalias;

	if (gethostname(thishost, sizeof(thishost)) == -1)
	fatal("gethostname: %s", strerror(errno));
	strlcpy(shorthost, thishost, sizeof(shorthost));
	shorthost[strcspn(thishost, ".")] = '\0';
	snprintf(portstr, sizeof(portstr), "%d", port);
	snprintf(uidstr, sizeof(uidstr), "%llu",
	(unsigned long long)pw->pw_uid);
	conn_hash_hex = ssh_connection_hash(thishost, host,
	portstr, ruser);
	keyalias = options->host_key_alias ?
	options->host_key_alias : host;

	cmd = percent_expand(arg,
	"C", conn_hash_hex,
	"L", shorthost,
	"d", pw->pw_dir,
	"h", host,
	"k", keyalias,
	"l", thishost,
	"n", original_host,
	"p", portstr,
	"r", ruser,
	"u", pw->pw_name,
	"i", uidstr,
	(char *)NULL);
	free(conn_hash_hex);
	if (result != 1) {
	/* skip execution if prior predicate failed */
	debug3("%.200s line %d: skipped exec "
	"\"%.100s\"", filename, linenum, cmd);
	free(cmd);
	continue;
	}
	r = execute_in_shell(cmd);
	if (r == -1) {
	fatal("%.200s line %d: match exec "
	"'%.100s' error", filename,
	linenum, cmd);
	}
	criteria = xstrdup(cmd);
	free(cmd);
	/* Force exit status to boolean */
	r = r == 0;
	if (r == (negate ? 1 : 0))
	this_result = result = 0;
	} else {
	error("Unsupported Match attribute %s", attrib);
	result = -1;
	goto out;
	}
	debug3("%.200s line %d: %smatched '%s%s%.100s%s' ",
	filename, linenum, this_result ? "": "not ", oattrib,
	criteria == NULL ? "" : " \"",
	criteria == NULL ? "" : criteria,
	criteria == NULL ? "" : "\"");
	free(criteria);
	}
	if (attributes == 0) {
	error("One or more attributes required for Match");
	result = -1;
	goto out;
	}
	out:
	if (result != -1)
	debug2("match %sfound", result ? "" : "not ");
	*condition = cp;
	free(host);
	return result;
	}

	/* Remove environment variable by pattern */
	static void
	rm_env(Options options, const char arg, const char *filename, int linenum)
	{
	u_int i, j, onum_send_env = options->num_send_env;

	/* Remove an environment variable */
	for (i = 0; i < options->num_send_env; ) {
	if (!match_pattern(options->send_env[i], arg + 1)) {
	i++;
	continue;
	}
	debug3("%s line %d: removing environment %s",
	filename, linenum, options->send_env[i]);
	free(options->send_env[i]);
	options->send_env[i] = NULL;
	for (j = i; j < options->num_send_env - 1; j++) {
	options->send_env[j] = options->send_env[j + 1];
	options->send_env[j + 1] = NULL;
	}
	options->num_send_env--;
	/* NB. don't increment i */
	}
	if (onum_send_env != options->num_send_env) {
	options->send_env = xrecallocarray(options->send_env,
	onum_send_env, options->num_send_env,
	sizeof(*options->send_env));
	}
	}

	/*
	* Returns the number of the token pointed to by cp or oBadOption.
	*/
	static OpCodes
	parse_token(const char cp, const char filename, int linenum,
	const char *ignored_unknown)
	{
	int i;

	for (i = 0; keywords[i].name; i++)
	if (strcmp(cp, keywords[i].name) == 0)
	return keywords[i].opcode;
	if (ignored_unknown != NULL &&
	match_pattern_list(cp, ignored_unknown, 1) == 1)
	return oIgnoredUnknownOption;
	error("%s: line %d: Bad configuration option: %s",
	filename, linenum, cp);
	return oBadOption;
	}

	/* Multistate option parsing */
	struct multistate {
	char *key;
	int value;
	};
	static const struct multistate multistate_flag[] = {
	{ "true", 1 },
	{ "false", 0 },
	{ "yes", 1 },
	{ "no", 0 },
	{ NULL, -1 }
	};
	static const struct multistate multistate_yesnoask[] = {
	{ "true", 1 },
	{ "false", 0 },
	{ "yes", 1 },
	{ "no", 0 },
	{ "ask", 2 },
	{ NULL, -1 }
	};
	static const struct multistate multistate_strict_hostkey[] = {
	{ "true", SSH_STRICT_HOSTKEY_YES },
	{ "false", SSH_STRICT_HOSTKEY_OFF },
	{ "yes", SSH_STRICT_HOSTKEY_YES },
	{ "no", SSH_STRICT_HOSTKEY_OFF },
	{ "ask", SSH_STRICT_HOSTKEY_ASK },
	{ "off", SSH_STRICT_HOSTKEY_OFF },
	{ "accept-new", SSH_STRICT_HOSTKEY_NEW },
	{ NULL, -1 }
	};
	static const struct multistate multistate_yesnoaskconfirm[] = {
	{ "true", 1 },
	{ "false", 0 },
	{ "yes", 1 },
	{ "no", 0 },
	{ "ask", 2 },
	{ "confirm", 3 },
	{ NULL, -1 }
	};
	static const struct multistate multistate_addressfamily[] = {
	{ "inet", AF_INET },
	{ "inet6", AF_INET6 },
	{ "any", AF_UNSPEC },
	{ NULL, -1 }
	};
	static const struct multistate multistate_controlmaster[] = {
	{ "true", SSHCTL_MASTER_YES },
	{ "yes", SSHCTL_MASTER_YES },
	{ "false", SSHCTL_MASTER_NO },
	{ "no", SSHCTL_MASTER_NO },
	{ "auto", SSHCTL_MASTER_AUTO },
	{ "ask", SSHCTL_MASTER_ASK },
	{ "autoask", SSHCTL_MASTER_AUTO_ASK },
	{ NULL, -1 }
	};
	static const struct multistate multistate_tunnel[] = {
	{ "ethernet", SSH_TUNMODE_ETHERNET },
	{ "point-to-point", SSH_TUNMODE_POINTOPOINT },
	{ "true", SSH_TUNMODE_DEFAULT },
	{ "yes", SSH_TUNMODE_DEFAULT },
	{ "false", SSH_TUNMODE_NO },
	{ "no", SSH_TUNMODE_NO },
	{ NULL, -1 }
	};
	static const struct multistate multistate_requesttty[] = {
	{ "true", REQUEST_TTY_YES },
	{ "yes", REQUEST_TTY_YES },
	{ "false", REQUEST_TTY_NO },
	{ "no", REQUEST_TTY_NO },
	{ "force", REQUEST_TTY_FORCE },
	{ "auto", REQUEST_TTY_AUTO },
	{ NULL, -1 }
	};
	static const struct multistate multistate_sessiontype[] = {
	{ "none", SESSION_TYPE_NONE },
	{ "subsystem", SESSION_TYPE_SUBSYSTEM },
	{ "default", SESSION_TYPE_DEFAULT },
	{ NULL, -1 }
	};
	static const struct multistate multistate_canonicalizehostname[] = {
	{ "true", SSH_CANONICALISE_YES },
	{ "false", SSH_CANONICALISE_NO },
	{ "yes", SSH_CANONICALISE_YES },
	{ "no", SSH_CANONICALISE_NO },
	{ "always", SSH_CANONICALISE_ALWAYS },
	{ NULL, -1 }
	};
	static const struct multistate multistate_pubkey_auth[] = {
	{ "true", SSH_PUBKEY_AUTH_ALL },
	{ "false", SSH_PUBKEY_AUTH_NO },
	{ "yes", SSH_PUBKEY_AUTH_ALL },
	{ "no", SSH_PUBKEY_AUTH_NO },
	{ "unbound", SSH_PUBKEY_AUTH_UNBOUND },
	{ "host-bound", SSH_PUBKEY_AUTH_HBOUND },
	{ NULL, -1 }
	};
	static const struct multistate multistate_compression[] = {
	#ifdef WITH_ZLIB
	{ "yes", COMP_ZLIB },
	#endif
	{ "no", COMP_NONE },
	{ NULL, -1 }
	};

	static int
	parse_multistate_value(const char arg, const char filename, int linenum,
	const struct multistate *multistate_ptr)
	{
	int i;

	if (!arg \|\| *arg == '\0') {
	error("%s line %d: missing argument.", filename, linenum);
	return -1;
	}
	for (i = 0; multistate_ptr[i].key != NULL; i++) {
	if (strcasecmp(arg, multistate_ptr[i].key) == 0)
	return multistate_ptr[i].value;
	}
	return -1;
	}

	/*
	* Processes a single option line as used in the configuration files. This
	* only sets those values that have not already been set.
	*/
	int
	process_config_line(Options options, struct passwd pw, const char *host,
	const char original_host, char line, const char *filename,
	int linenum, int *activep, int flags)
	{
	return process_config_line_depth(options, pw, host, original_host,
	line, filename, linenum, activep, flags, NULL, 0);
	}

	#define WHITESPACE " \t\r\n"
	static int
	process_config_line_depth(Options options, struct passwd pw, const char *host,
	const char original_host, char line, const char *filename,
	int linenum, int activep, int flags, int want_final_pass, int depth)
	{
	char str, charptr, endofnumber, keyword, arg, arg2, p;
	char cpptr, *cppptr, fwdarg[256];
	u_int i, *uintptr, uvalue, max_entries = 0;
	int r, oactive, negated, opcode, *intptr, value, value2, cmdline = 0;
	int remotefwd, dynamicfwd, ca_only = 0;
	LogLevel *log_level_ptr;
	SyslogFacility *log_facility_ptr;
	long long val64;
	size_t len;
	struct Forward fwd;
	const struct multistate *multistate_ptr;
	struct allowed_cname *cname;
	glob_t gl;
	const char *errstr;
	char oav = NULL, av;
	int oac = 0, ac;
	int ret = -1;

	if (activep == NULL) { /* We are processing a command line directive */
	cmdline = 1;
	activep = &cmdline;
	}

	/* 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;
	/* Get the keyword. (Each line is supposed to begin with a keyword). */
	if ((keyword = strdelim(&str)) == NULL)
	return 0;
	/* Ignore leading whitespace. */
	if (*keyword == '\0')
	keyword = strdelim(&str);
	if (keyword == NULL \|\| !keyword \|\| keyword == '\n' \|\| *keyword == '#')
	return 0;
	/* Match lowercase keyword */
	lowercase(keyword);

	/* Prepare to parse remainder of line */
	if (str != NULL)
	str += strspn(str, WHITESPACE);
	if (str == NULL \|\| *str == '\0') {
	error("%s line %d: no argument after keyword \"%s\"",
	filename, linenum, keyword);
	return -1;
	}
	opcode = parse_token(keyword, filename, linenum,
	options->ignored_unknown);
	if (argv_split(str, &oac, &oav, 1) != 0) {
	error("%s line %d: invalid quotes", filename, linenum);
	return -1;
	}
	ac = oac;
	av = oav;

	switch (opcode) {
	case oBadOption:
	/* don't panic, but count bad options */
	goto out;
	case oIgnore:
	argv_consume(&ac);
	break;
	case oIgnoredUnknownOption:
	debug("%s line %d: Ignored unknown option \"%s\"",
	filename, linenum, keyword);
	argv_consume(&ac);
	break;
	case oConnectTimeout:
	intptr = &options->connection_timeout;
	parse_time:
	arg = argv_next(&ac, &av);
	if (!arg \|\| *arg == '\0') {
	error("%s line %d: missing time value.",
	filename, linenum);
	goto out;
	}
	if (strcmp(arg, "none") == 0)
	value = -1;
	else if ((value = convtime(arg)) == -1) {
	error("%s line %d: invalid time value.",
	filename, linenum);
	goto out;
	}
	if (activep && intptr == -1)
	*intptr = value;
	break;

	case oForwardAgent:
	intptr = &options->forward_agent;

	arg = argv_next(&ac, &av);
	if (!arg \|\| *arg == '\0') {
	error("%s line %d: missing argument.",
	filename, linenum);
	goto out;
	}

	value = -1;
	multistate_ptr = multistate_flag;
	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) {
	if (activep && intptr == -1)
	*intptr = value;
	break;
	}
	/* ForwardAgent wasn't 'yes' or 'no', assume a path */
	if (activep && intptr == -1)
	*intptr = 1;

	charptr = &options->forward_agent_sock_path;
	goto parse_agent_path;

	case oForwardX11:
	intptr = &options->forward_x11;
	parse_flag:
	multistate_ptr = multistate_flag;
	parse_multistate:
	arg = argv_next(&ac, &av);
	if ((value = parse_multistate_value(arg, filename, linenum,
	multistate_ptr)) == -1) {
	error("%s line %d: unsupported option \"%s\".",
	filename, linenum, arg);
	goto out;
	}
	if (activep && intptr == -1)
	*intptr = value;
	break;

	case oForwardX11Trusted:
	intptr = &options->forward_x11_trusted;
	goto parse_flag;

	case oForwardX11Timeout:
	intptr = &options->forward_x11_timeout;
	goto parse_time;

	case oGatewayPorts:
	intptr = &options->fwd_opts.gateway_ports;
	goto parse_flag;

	case oExitOnForwardFailure:
	intptr = &options->exit_on_forward_failure;
	goto parse_flag;

	case oPasswordAuthentication:
	intptr = &options->password_authentication;
	goto parse_flag;

	case oKbdInteractiveAuthentication:
	intptr = &options->kbd_interactive_authentication;
	goto parse_flag;

	case oKbdInteractiveDevices:
	charptr = &options->kbd_interactive_devices;
	goto parse_string;

	case oPubkeyAuthentication:
	multistate_ptr = multistate_pubkey_auth;
	intptr = &options->pubkey_authentication;
	goto parse_multistate;

	case oHostbasedAuthentication:
	intptr = &options->hostbased_authentication;
	goto parse_flag;

	case oGssAuthentication:
	intptr = &options->gss_authentication;
	goto parse_flag;

	case oGssDelegateCreds:
	intptr = &options->gss_deleg_creds;
	goto parse_flag;

	case oBatchMode:
	intptr = &options->batch_mode;
	goto parse_flag;

	case oCheckHostIP:
	intptr = &options->check_host_ip;
	goto parse_flag;

	case oVerifyHostKeyDNS:
	intptr = &options->verify_host_key_dns;
	multistate_ptr = multistate_yesnoask;
	goto parse_multistate;

	case oStrictHostKeyChecking:
	intptr = &options->strict_host_key_checking;
	multistate_ptr = multistate_strict_hostkey;
	goto parse_multistate;

	case oCompression:
	intptr = &options->compression;
	multistate_ptr = multistate_compression;
	goto parse_multistate;

	case oTCPKeepAlive:
	intptr = &options->tcp_keep_alive;
	goto parse_flag;

	case oNoHostAuthenticationForLocalhost:
	intptr = &options->no_host_authentication_for_localhost;
	goto parse_flag;

	case oNumberOfPasswordPrompts:
	intptr = &options->number_of_password_prompts;
	goto parse_int;

	case oRekeyLimit:
	arg = argv_next(&ac, &av);
	if (!arg \|\| *arg == '\0') {
	error("%.200s line %d: Missing argument.", filename,
	linenum);
	goto out;
	}
	if (strcmp(arg, "default") == 0) {
	val64 = 0;
	} else {
	if (scan_scaled(arg, &val64) == -1) {
	error("%.200s line %d: Bad number '%s': %s",
	filename, linenum, arg, strerror(errno));
	goto out;
	}
	if (val64 != 0 && val64 < 16) {
	error("%.200s line %d: RekeyLimit too small",
	filename, linenum);
	goto out;
	}
	}
	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 oIdentityFile:
	arg = argv_next(&ac, &av);
	if (!arg \|\| *arg == '\0') {
	error("%.200s line %d: Missing argument.",
	filename, linenum);
	goto out;
	}
	if (*activep) {
	intptr = &options->num_identity_files;
	if (*intptr >= SSH_MAX_IDENTITY_FILES) {
	error("%.200s line %d: Too many identity files "
	"specified (max %d).", filename, linenum,
	SSH_MAX_IDENTITY_FILES);
	goto out;
	}
	add_identity_file(options, NULL,
	arg, flags & SSHCONF_USERCONF);
	}
	break;

	case oCertificateFile:
	arg = argv_next(&ac, &av);
	if (!arg \|\| *arg == '\0') {
	error("%.200s line %d: Missing argument.",
	filename, linenum);
	goto out;
	}
	if (*activep) {
	intptr = &options->num_certificate_files;
	if (*intptr >= SSH_MAX_CERTIFICATE_FILES) {
	error("%.200s line %d: Too many certificate "
	"files specified (max %d).",
	filename, linenum,
	SSH_MAX_CERTIFICATE_FILES);
	goto out;
	}
	add_certificate_file(options, arg,
	flags & SSHCONF_USERCONF);
	}
	break;

	case oXAuthLocation:
	charptr=&options->xauth_location;
	goto parse_string;

	case oUser:
	charptr = &options->user;
	parse_string:
	arg = argv_next(&ac, &av);
	if (!arg \|\| *arg == '\0') {
	error("%.200s line %d: Missing argument.",
	filename, linenum);
	goto out;
	}
	if (activep && charptr == NULL)
	*charptr = xstrdup(arg);
	break;

	case oGlobalKnownHostsFile:
	cpptr = (char **)&options->system_hostfiles;
	uintptr = &options->num_system_hostfiles;
	max_entries = SSH_MAX_HOSTS_FILES;
	parse_char_array:
	i = 0;
	value = uintptr == 0; / was array empty when we started? */
	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 (*activep && value) {
	if ((*uintptr) >= max_entries) {
	error("%s line %d: too many %s "
	"entries.", filename, linenum,
	keyword);
	goto out;
	}
	cpptr[(*uintptr)++] = xstrdup(arg);
	}
	}
	break;

	case oUserKnownHostsFile:
	cpptr = (char **)&options->user_hostfiles;
	uintptr = &options->num_user_hostfiles;
	max_entries = SSH_MAX_HOSTS_FILES;
	goto parse_char_array;

	case oHostname:
	charptr = &options->hostname;
	goto parse_string;

	case oTag:
	charptr = &options->tag;
	goto parse_string;

	case oHostKeyAlias:
	charptr = &options->host_key_alias;
	goto parse_string;

	case oPreferredAuthentications:
	charptr = &options->preferred_authentications;
	goto parse_string;

	case oBindAddress:
	charptr = &options->bind_address;
	goto parse_string;

	case oBindInterface:
	charptr = &options->bind_interface;
	goto parse_string;

	case oPKCS11Provider:
	charptr = &options->pkcs11_provider;
	goto parse_string;

	case oSecurityKeyProvider:
	charptr = &options->sk_provider;
	goto parse_string;

	case oKnownHostsCommand:
	charptr = &options->known_hosts_command;
	goto parse_command;

	case oProxyCommand:
	charptr = &options->proxy_command;
	/* Ignore ProxyCommand if ProxyJump already specified */
	if (options->jump_host != NULL)
	charptr = &options->jump_host; /* Skip below */
	parse_command:
	if (str == NULL) {
	error("%.200s line %d: Missing argument.",
	filename, linenum);
	goto out;
	}
	len = strspn(str, WHITESPACE "=");
	if (activep && charptr == NULL)
	*charptr = xstrdup(str + len);
	argv_consume(&ac);
	break;

	case oProxyJump:
	if (str == NULL) {
	error("%.200s line %d: Missing argument.",
	filename, linenum);
	goto out;
	}
	len = strspn(str, WHITESPACE "=");
	/* XXX use argv? */
	if (parse_jump(str + len, options, *activep) == -1) {
	error("%.200s line %d: Invalid ProxyJump \"%s\"",
	filename, linenum, str + len);
	goto out;
	}
	argv_consume(&ac);
	break;

	case oPort:
	arg = argv_next(&ac, &av);
	if (!arg \|\| *arg == '\0') {
	error("%.200s line %d: Missing argument.",
	filename, linenum);
	goto out;
	}
	value = a2port(arg);
	if (value <= 0) {
	error("%.200s line %d: Bad port '%s'.",
	filename, linenum, arg);
	goto out;
	}
	if (*activep && options->port == -1)
	options->port = value;
	break;

	case oConnectionAttempts:
	intptr = &options->connection_attempts;
	parse_int:
	arg = argv_next(&ac, &av);
	if ((errstr = atoi_err(arg, &value)) != NULL) {
	error("%s line %d: integer value %s.",
	filename, linenum, errstr);
	goto out;
	}
	if (activep && intptr == -1)
	*intptr = value;
	break;

	case oCiphers:
	arg = argv_next(&ac, &av);
	if (!arg \|\| *arg == '\0') {
	error("%.200s line %d: Missing argument.",
	filename, linenum);
	goto out;
	}
	if (*arg != '-' &&
	!ciphers_valid(arg == '+' \|\| arg == '^' ? arg + 1 : arg)){
	error("%.200s line %d: Bad SSH2 cipher spec '%s'.",
	filename, linenum, arg ? arg : "<NONE>");
	goto out;
	}
	if (*activep && options->ciphers == NULL)
	options->ciphers = xstrdup(arg);
	break;

	case oMacs:
	arg = argv_next(&ac, &av);
	if (!arg \|\| *arg == '\0') {
	error("%.200s line %d: Missing argument.",
	filename, linenum);
	goto out;
	}
	if (*arg != '-' &&
	!mac_valid(arg == '+' \|\| arg == '^' ? arg + 1 : arg)) {
	error("%.200s line %d: Bad SSH2 MAC spec '%s'.",
	filename, linenum, arg ? arg : "<NONE>");
	goto out;
	}
	if (*activep && options->macs == NULL)
	options->macs = xstrdup(arg);
	break;

	case oKexAlgorithms:
	arg = argv_next(&ac, &av);
	if (!arg \|\| *arg == '\0') {
	error("%.200s line %d: Missing argument.",
	filename, linenum);
	goto out;
	}
	if (*arg != '-' &&
	!kex_names_valid(arg == '+' \|\| arg == '^' ?
	arg + 1 : arg)) {
	error("%.200s line %d: Bad SSH2 KexAlgorithms '%s'.",
	filename, linenum, arg ? arg : "<NONE>");
	goto out;
	}
	if (*activep && options->kex_algorithms == NULL)
	options->kex_algorithms = xstrdup(arg);
	break;

	case oHostKeyAlgorithms:
	charptr = &options->hostkeyalgorithms;
	ca_only = 0;
	parse_pubkey_algos:
	arg = argv_next(&ac, &av);
	if (!arg \|\| *arg == '\0') {
	error("%.200s line %d: Missing argument.",
	filename, linenum);
	goto out;
	}
	if (*arg != '-' &&
	!sshkey_names_valid2(arg == '+' \|\| arg == '^' ?
	arg + 1 : arg, 1, ca_only)) {
	error("%s line %d: Bad key types '%s'.",
	filename, linenum, arg ? arg : "<NONE>");
	goto out;
	}
	if (activep && charptr == NULL)
	*charptr = xstrdup(arg);
	break;

	case oCASignatureAlgorithms:
	charptr = &options->ca_sign_algorithms;
	ca_only = 1;
	goto parse_pubkey_algos;

	case oLogLevel:
	log_level_ptr = &options->log_level;
	arg = argv_next(&ac, &av);
	value = log_level_number(arg);
	if (value == SYSLOG_LEVEL_NOT_SET) {
	error("%.200s line %d: unsupported log level '%s'",
	filename, linenum, arg ? arg : "<NONE>");
	goto out;
	}
	if (activep && log_level_ptr == SYSLOG_LEVEL_NOT_SET)
	*log_level_ptr = (LogLevel) value;
	break;

	case oLogFacility:
	log_facility_ptr = &options->log_facility;
	arg = argv_next(&ac, &av);
	value = log_facility_number(arg);
	if (value == SYSLOG_FACILITY_NOT_SET) {
	error("%.200s line %d: unsupported log facility '%s'",
	filename, linenum, arg ? arg : "<NONE>");
	goto out;
	}
	if (*log_facility_ptr == -1)
	*log_facility_ptr = (SyslogFacility) value;
	break;

	case oLogVerbose:
	cppptr = &options->log_verbose;
	uintptr = &options->num_log_verbose;
	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 (activep && uintptr == 0) {
	cppptr = xrecallocarray(cppptr, *uintptr,
	uintptr + 1, sizeof(*cppptr));
	(cppptr)[(uintptr)++] = xstrdup(arg);
	}
	}
	break;

	case oLocalForward:
	case oRemoteForward:
	case oDynamicForward:
	arg = argv_next(&ac, &av);
	if (!arg \|\| *arg == '\0') {
	error("%.200s line %d: Missing argument.",
	filename, linenum);
	goto out;
	}

	remotefwd = (opcode == oRemoteForward);
	dynamicfwd = (opcode == oDynamicForward);

	if (!dynamicfwd) {
	arg2 = argv_next(&ac, &av);
	if (arg2 == NULL \|\| *arg2 == '\0') {
	if (remotefwd)
	dynamicfwd = 1;
	else {
	error("%.200s line %d: Missing target "
	"argument.", filename, linenum);
	goto out;
	}
	} else {
	/* construct a string for parse_forward */
	snprintf(fwdarg, sizeof(fwdarg), "%s:%s", arg,
	arg2);
	}
	}
	if (dynamicfwd)
	strlcpy(fwdarg, arg, sizeof(fwdarg));

	if (parse_forward(&fwd, fwdarg, dynamicfwd, remotefwd) == 0) {
	error("%.200s line %d: Bad forwarding specification.",
	filename, linenum);
	goto out;
	}

	if (*activep) {
	if (remotefwd) {
	add_remote_forward(options, &fwd);
	} else {
	add_local_forward(options, &fwd);
	}
	}
	break;

	case oPermitRemoteOpen:
	uintptr = &options->num_permitted_remote_opens;
	cppptr = &options->permitted_remote_opens;
	uvalue = uintptr; / modified later */
	i = 0;
	while ((arg = argv_next(&ac, &av)) != NULL) {
	arg2 = xstrdup(arg);
	/* Allow any/none only in first position */
	if (strcasecmp(arg, "none") == 0 \|\|
	strcasecmp(arg, "any") == 0) {
	if (i > 0 \|\| ac > 0) {
	error("%s line %d: keyword %s \"%s\" "
	"argument must appear alone.",
	filename, linenum, keyword, arg);
	free(arg2);
	goto out;
	}
	} else {
	p = hpdelim(&arg);
	if (p == NULL) {
	fatal("%s line %d: missing host in %s",
	filename, linenum,
	lookup_opcode_name(opcode));
	}
	p = cleanhostname(p);
	/*
	* don't want to use permitopen_port to avoid
	* dependency on channels.[ch] here.
	*/
	if (arg == NULL \|\| (strcmp(arg, "*") != 0 &&
	a2port(arg) <= 0)) {
	fatal("%s line %d: bad port number "
	"in %s", filename, linenum,
	lookup_opcode_name(opcode));
	}
	}
	if (*activep && uvalue == 0) {
	opt_array_append(filename, linenum,
	lookup_opcode_name(opcode),
	cppptr, uintptr, arg2);
	}
	free(arg2);
	i++;
	}
	if (i == 0)
	fatal("%s line %d: missing %s specification",
	filename, linenum, lookup_opcode_name(opcode));
	break;

	case oClearAllForwardings:
	intptr = &options->clear_forwardings;
	goto parse_flag;

	case oHost:
	if (cmdline) {
	error("Host directive not supported as a command-line "
	"option");
	goto out;
	}
	*activep = 0;
	arg2 = NULL;
	while ((arg = argv_next(&ac, &av)) != NULL) {
	if (*arg == '\0') {
	error("%s line %d: keyword %s empty argument",
	filename, linenum, keyword);
	goto out;
	}
	if ((flags & SSHCONF_NEVERMATCH) != 0) {
	argv_consume(&ac);
	break;
	}
	negated = *arg == '!';
	if (negated)
	arg++;
	if (match_pattern(host, arg)) {
	if (negated) {
	debug("%.200s line %d: Skipping Host "
	"block because of negated match "
	"for %.100s", filename, linenum,
	arg);
	*activep = 0;
	argv_consume(&ac);
	break;
	}
	if (!*activep)
	arg2 = arg; /* logged below */
	*activep = 1;
	}
	}
	if (*activep)
	debug("%.200s line %d: Applying options for %.100s",
	filename, linenum, arg2);
	break;

	case oMatch:
	if (cmdline) {
	error("Host directive not supported as a command-line "
	"option");
	goto out;
	}
	value = match_cfg_line(options, &str, pw, host, original_host,
	flags & SSHCONF_FINAL, want_final_pass,
	filename, linenum);
	if (value < 0) {
	error("%.200s line %d: Bad Match condition", filename,
	linenum);
	goto out;
	}
	*activep = (flags & SSHCONF_NEVERMATCH) ? 0 : value;
	/*
	* 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 oEscapeChar:
	intptr = &options->escape_char;
	arg = argv_next(&ac, &av);
	if (!arg \|\| *arg == '\0') {
	error("%.200s line %d: Missing argument.",
	filename, linenum);
	goto out;
	}
	if (strcmp(arg, "none") == 0)
	value = SSH_ESCAPECHAR_NONE;
	else if (arg[1] == '\0')
	value = (u_char) arg[0];
	else if (arg[0] == '^' && arg[2] == 0 &&
	(u_char) arg[1] >= 64 && (u_char) arg[1] < 128)
	value = (u_char) arg[1] & 31;
	else {
	error("%.200s line %d: Bad escape character.",
	filename, linenum);
	goto out;
	}
	if (activep && intptr == -1)
	*intptr = value;
	break;

	case oAddressFamily:
	intptr = &options->address_family;
	multistate_ptr = multistate_addressfamily;
	goto parse_multistate;

	case oEnableSSHKeysign:
	intptr = &options->enable_ssh_keysign;
	goto parse_flag;

	case oIdentitiesOnly:
	intptr = &options->identities_only;
	goto parse_flag;

	case oServerAliveInterval:
	intptr = &options->server_alive_interval;
	goto parse_time;

	case oServerAliveCountMax:
	intptr = &options->server_alive_count_max;
	goto parse_int;

	case oSendEnv:
	while ((arg = argv_next(&ac, &av)) != NULL) {
	if (*arg == '\0' \|\| strchr(arg, '=') != NULL) {
	error("%s line %d: Invalid environment name.",
	filename, linenum);
	goto out;
	}
	if (!*activep)
	continue;
	if (*arg == '-') {
	/* Removing an env var */
	rm_env(options, arg, filename, linenum);
	continue;
	}
	opt_array_append(filename, linenum,
	lookup_opcode_name(opcode),
	&options->send_env, &options->num_send_env, arg);
	}
	break;

	case oSetEnv:
	value = options->num_setenv;
	while ((arg = argv_next(&ac, &av)) != NULL) {
	if (strchr(arg, '=') == NULL) {
	error("%s line %d: Invalid SetEnv.",
	filename, linenum);
	goto out;
	}
	if (!*activep \|\| value != 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,
	lookup_opcode_name(opcode),
	&options->setenv, &options->num_setenv, arg);
	}
	break;

	case oControlPath:
	charptr = &options->control_path;
	goto parse_string;

	case oControlMaster:
	intptr = &options->control_master;
	multistate_ptr = multistate_controlmaster;
	goto parse_multistate;

	case oControlPersist:
	/* no/false/yes/true, or a time spec */
	intptr = &options->control_persist;
	arg = argv_next(&ac, &av);
	if (!arg \|\| *arg == '\0') {
	error("%.200s line %d: Missing ControlPersist"
	" argument.", filename, linenum);
	goto out;
	}
	value = 0;
	value2 = 0; /* timeout */
	if (strcmp(arg, "no") == 0 \|\| strcmp(arg, "false") == 0)
	value = 0;
	else if (strcmp(arg, "yes") == 0 \|\| strcmp(arg, "true") == 0)
	value = 1;
	else if ((value2 = convtime(arg)) >= 0)
	value = 1;
	else {
	error("%.200s line %d: Bad ControlPersist argument.",
	filename, linenum);
	goto out;
	}
	if (activep && intptr == -1) {
	*intptr = value;
	options->control_persist_timeout = value2;
	}
	break;

	case oHashKnownHosts:
	intptr = &options->hash_known_hosts;
	goto parse_flag;

	case oTunnel:
	intptr = &options->tun_open;
	multistate_ptr = multistate_tunnel;
	goto parse_multistate;

	case oTunnelDevice:
	arg = argv_next(&ac, &av);
	if (!arg \|\| *arg == '\0') {
	error("%.200s line %d: Missing argument.",
	filename, linenum);
	goto out;
	}
	value = a2tun(arg, &value2);
	if (value == SSH_TUNID_ERR) {
	error("%.200s line %d: Bad tun device.",
	filename, linenum);
	goto out;
	}
	if (*activep && options->tun_local == -1) {
	options->tun_local = value;
	options->tun_remote = value2;
	}
	break;

	case oLocalCommand:
	charptr = &options->local_command;
	goto parse_command;

	case oPermitLocalCommand:
	intptr = &options->permit_local_command;
	goto parse_flag;

	case oRemoteCommand:
	charptr = &options->remote_command;
	goto parse_command;

	case oVisualHostKey:
	intptr = &options->visual_host_key;
	goto parse_flag;

	case oInclude:
	if (cmdline) {
	error("Include directive not supported as a "
	"command-line option");
	goto out;
	}
	value = 0;
	while ((arg = argv_next(&ac, &av)) != NULL) {
	if (*arg == '\0') {
	error("%s line %d: keyword %s empty argument",
	filename, linenum, keyword);
	goto out;
	}
	/*
	* Ensure all paths are anchored. User configuration
	* files may begin with '~/' but system configurations
	* must not. If the path is relative, then treat it
	* as living in ~/.ssh for user configurations or
	* /etc/ssh for system ones.
	*/
	if (*arg == '~' && (flags & SSHCONF_USERCONF) == 0) {
	error("%.200s line %d: bad include path %s.",
	filename, linenum, arg);
	goto out;
	}
	if (!path_absolute(arg) && *arg != '~') {
	xasprintf(&arg2, "%s/%s",
	(flags & SSHCONF_USERCONF) ?
	"~/" _PATH_SSH_USER_DIR : SSHDIR, arg);
	} else
	arg2 = xstrdup(arg);
	memset(&gl, 0, sizeof(gl));
	r = glob(arg2, GLOB_TILDE, NULL, &gl);
	if (r == GLOB_NOMATCH) {
	debug("%.200s line %d: include %s matched no "
	"files",filename, linenum, arg2);
	free(arg2);
	continue;
	} else if (r != 0) {
	error("%.200s line %d: glob failed for %s.",
	filename, linenum, arg2);
	goto out;
	}
	free(arg2);
	oactive = *activep;
	for (i = 0; i < gl.gl_pathc; i++) {
	debug3("%.200s line %d: Including file %s "
	"depth %d%s", filename, linenum,
	gl.gl_pathv[i], depth,
	oactive ? "" : " (parse only)");
	r = read_config_file_depth(gl.gl_pathv[i],
	pw, host, original_host, options,
	flags \| SSHCONF_CHECKPERM \|
	(oactive ? 0 : SSHCONF_NEVERMATCH),
	activep, want_final_pass, depth + 1);
	if (r != 1 && errno != ENOENT) {
	error("Can't open user config file "
	"%.100s: %.100s", gl.gl_pathv[i],
	strerror(errno));
	globfree(&gl);
	goto out;
	}
	/*
	* don't let Match in includes clobber the
	* containing file's Match state.
	*/
	*activep = oactive;
	if (r != 1)
	value = -1;
	}
	globfree(&gl);
	}
	if (value != 0)
	ret = value;
	break;

	case oIPQoS:
	arg = argv_next(&ac, &av);
	if ((value = parse_ipqos(arg)) == -1) {
	error("%s line %d: Bad IPQoS value: %s",
	filename, linenum, arg);
	goto out;
	}
	arg = argv_next(&ac, &av);
	if (arg == NULL)
	value2 = value;
	else if ((value2 = parse_ipqos(arg)) == -1) {
	error("%s line %d: Bad IPQoS value: %s",
	filename, linenum, arg);
	goto out;
	}
	if (*activep && options->ip_qos_interactive == -1) {
	options->ip_qos_interactive = value;
	options->ip_qos_bulk = value2;
	}
	break;

	case oRequestTTY:
	intptr = &options->request_tty;
	multistate_ptr = multistate_requesttty;
	goto parse_multistate;

	case oSessionType:
	intptr = &options->session_type;
	multistate_ptr = multistate_sessiontype;
	goto parse_multistate;

	case oStdinNull:
	intptr = &options->stdin_null;
	goto parse_flag;

	case oForkAfterAuthentication:
	intptr = &options->fork_after_authentication;
	goto parse_flag;

	case oIgnoreUnknown:
	charptr = &options->ignored_unknown;
	goto parse_string;

	case oProxyUseFdpass:
	intptr = &options->proxy_use_fdpass;
	goto parse_flag;

	case oCanonicalDomains:
	value = options->num_canonical_domains != 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 (!valid_domain(arg, 1, &errstr)) {
	error("%s line %d: %s", filename, linenum,
	errstr);
	goto out;
	}
	if (!*activep \|\| value)
	continue;
	if (options->num_canonical_domains >=
	MAX_CANON_DOMAINS) {
	error("%s line %d: too many hostname suffixes.",
	filename, linenum);
	goto out;
	}
	options->canonical_domains[
	options->num_canonical_domains++] = xstrdup(arg);
	}
	break;

	case oCanonicalizePermittedCNAMEs:
	value = options->num_permitted_cnames != 0;
	i = 0;
	while ((arg = argv_next(&ac, &av)) != NULL) {
	/*
	* Either 'none' (only in first position), '*' for
	* everything or 'list:list'
	*/
	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;
	}
	arg2 = "";
	} else if (strcmp(arg, "*") == 0) {
	arg2 = arg;
	} else {
	lowercase(arg);
	if ((arg2 = strchr(arg, ':')) == NULL \|\|
	arg2[1] == '\0') {
	error("%s line %d: "
	"Invalid permitted CNAME \"%s\"",
	filename, linenum, arg);
	goto out;
	}
	*arg2 = '\0';
	arg2++;
	}
	i++;
	if (!*activep \|\| value)
	continue;
	if (options->num_permitted_cnames >=
	MAX_CANON_DOMAINS) {
	error("%s line %d: too many permitted CNAMEs.",
	filename, linenum);
	goto out;
	}
	cname = options->permitted_cnames +
	options->num_permitted_cnames++;
	cname->source_list = xstrdup(arg);
	cname->target_list = xstrdup(arg2);
	}
	break;

	case oCanonicalizeHostname:
	intptr = &options->canonicalize_hostname;
	multistate_ptr = multistate_canonicalizehostname;
	goto parse_multistate;

	case oCanonicalizeMaxDots:
	intptr = &options->canonicalize_max_dots;
	goto parse_int;

	case oCanonicalizeFallbackLocal:
	intptr = &options->canonicalize_fallback_local;
	goto parse_flag;

	case oStreamLocalBindMask:
	arg = argv_next(&ac, &av);
	if (!arg \|\| *arg == '\0') {
	error("%.200s line %d: Missing StreamLocalBindMask "
	"argument.", filename, linenum);
	goto out;
	}
	/* Parse mode in octal format */
	value = strtol(arg, &endofnumber, 8);
	if (arg == endofnumber \|\| value < 0 \|\| value > 0777) {
	error("%.200s line %d: Bad mask.", filename, linenum);
	goto out;
	}
	options->fwd_opts.streamlocal_bind_mask = (mode_t)value;
	break;

	case oStreamLocalBindUnlink:
	intptr = &options->fwd_opts.streamlocal_bind_unlink;
	goto parse_flag;

	case oRevokedHostKeys:
	charptr = &options->revoked_host_keys;
	goto parse_string;

	case oFingerprintHash:
	intptr = &options->fingerprint_hash;
	arg = argv_next(&ac, &av);
	if (!arg \|\| *arg == '\0') {
	error("%.200s line %d: Missing argument.",
	filename, linenum);
	goto out;
	}
	if ((value = ssh_digest_alg_by_name(arg)) == -1) {
	error("%.200s line %d: Invalid hash algorithm \"%s\".",
	filename, linenum, arg);
	goto out;
	}
	if (activep && intptr == -1)
	*intptr = value;
	break;

	case oUpdateHostkeys:
	intptr = &options->update_hostkeys;
	multistate_ptr = multistate_yesnoask;
	goto parse_multistate;

	case oHostbasedAcceptedAlgorithms:
	charptr = &options->hostbased_accepted_algos;
	ca_only = 0;
	goto parse_pubkey_algos;

	case oPubkeyAcceptedAlgorithms:
	charptr = &options->pubkey_accepted_algos;
	ca_only = 0;
	goto parse_pubkey_algos;

	case oAddKeysToAgent:
	arg = argv_next(&ac, &av);
	arg2 = argv_next(&ac, &av);
	value = parse_multistate_value(arg, filename, linenum,
	multistate_yesnoaskconfirm);
	value2 = 0; /* unlimited lifespan by default */
	if (value == 3 && arg2 != NULL) {
	/* allow "AddKeysToAgent confirm 5m" */
	if ((value2 = convtime(arg2)) == -1) {
	error("%s line %d: invalid time value.",
	filename, linenum);
	goto out;
	}
	} else if (value == -1 && arg2 == NULL) {
	if ((value2 = convtime(arg)) == -1) {
	error("%s line %d: unsupported option",
	filename, linenum);
	goto out;
	}
	value = 1; /* yes */
	} else if (value == -1 \|\| arg2 != NULL) {
	error("%s line %d: unsupported option",
	filename, linenum);
	goto out;
	}
	if (*activep && options->add_keys_to_agent == -1) {
	options->add_keys_to_agent = value;
	options->add_keys_to_agent_lifespan = value2;
	}
	break;

	case oIdentityAgent:
	charptr = &options->identity_agent;
	arg = argv_next(&ac, &av);
	if (!arg \|\| *arg == '\0') {
	error("%.200s line %d: Missing argument.",
	filename, linenum);
	goto out;
	}
	parse_agent_path:
	/* Extra validation if the string represents an env var. */
	if ((arg2 = dollar_expand(&r, arg)) == NULL \|\| r) {
	error("%.200s line %d: Invalid environment expansion "
	"%s.", filename, linenum, arg);
	goto out;
	}
	free(arg2);
	/* check for legacy environment format */
	if (arg[0] == '$' && arg[1] != '{' &&
	!valid_env_name(arg + 1)) {
	error("%.200s line %d: Invalid environment name %s.",
	filename, linenum, arg);
	goto out;
	}
	if (activep && charptr == NULL)
	*charptr = xstrdup(arg);
	break;

	case oEnableEscapeCommandline:
	intptr = &options->enable_escape_commandline;
	goto parse_flag;

	case oRequiredRSASize:
	intptr = &options->required_rsa_size;
	goto parse_int;

	case oDeprecated:
	debug("%s line %d: Deprecated option \"%s\"",
	filename, linenum, keyword);
	argv_consume(&ac);
	break;

	case oUnsupported:
	error("%s line %d: Unsupported option \"%s\"",
	filename, linenum, keyword);
	argv_consume(&ac);
	break;

	default:
	error("%s line %d: Unimplemented opcode %d",
	filename, linenum, opcode);
	goto out;
	}

	/* 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;
	}

	/*
	* Reads the config file and modifies the options accordingly. Options
	* should already be initialized before this call. This never returns if
	* there is an error. If the file does not exist, this returns 0.
	*/
	int
	read_config_file(const char filename, struct passwd pw, const char *host,
	const char original_host, Options options, int flags,
	int *want_final_pass)
	{
	int active = 1;

	return read_config_file_depth(filename, pw, host, original_host,
	options, flags, &active, want_final_pass, 0);
	}

	#define READCONF_MAX_DEPTH 16
	static int
	read_config_file_depth(const char filename, struct passwd pw,
	const char host, const char original_host, Options *options,
	int flags, int activep, int want_final_pass, int depth)
	{
	FILE *f;
	char *line = NULL;
	size_t linesize = 0;
	int linenum;
	int bad_options = 0;

	if (depth < 0 \|\| depth > READCONF_MAX_DEPTH)
	fatal("Too many recursive configuration includes");

	if ((f = fopen(filename, "r")) == NULL)
	return 0;

	if (flags & SSHCONF_CHECKPERM) {
	struct stat sb;

	if (fstat(fileno(f), &sb) == -1)
	fatal("fstat %s: %s", filename, strerror(errno));
	if (((sb.st_uid != 0 && sb.st_uid != getuid()) \|\|
	(sb.st_mode & 022) != 0))
	fatal("Bad owner or permissions on %s", filename);
	}

	debug("Reading configuration data %.200s", filename);

	/*
	* Mark that we are now processing the options. This flag is turned
	* on/off by Host specifications.
	*/
	linenum = 0;
	while (getline(&line, &linesize, f) != -1) {
	/* Update line number counter. */
	linenum++;
	/*
	* Trim out comments and strip whitespace.
	* NB - preserve newlines, they are needed to reproduce
	* line numbers later for error messages.
	*/
	if (process_config_line_depth(options, pw, host, original_host,
	line, filename, linenum, activep, flags, want_final_pass,
	depth) != 0)
	bad_options++;
	}
	free(line);
	fclose(f);
	if (bad_options > 0)
	fatal("%s: terminating, %d bad configuration options",
	filename, bad_options);
	return 1;
	}

	/* Returns 1 if a string option is unset or set to "none" or 0 otherwise. */
	int
	option_clear_or_none(const char *o)
	{
	return o == NULL \|\| strcasecmp(o, "none") == 0;
	}

	/*
	* Returns 1 if CanonicalizePermittedCNAMEs have been specified, 0 otherwise.
	* Allowed to be called on non-final configuration.
	*/
	int
	config_has_permitted_cnames(Options *options)
	{
	if (options->num_permitted_cnames == 1 &&
	strcasecmp(options->permitted_cnames[0].source_list, "none") == 0 &&
	strcmp(options->permitted_cnames[0].target_list, "") == 0)
	return 0;
	return options->num_permitted_cnames > 0;
	}

	/*
	* Initializes options to special values that indicate that they have not yet
	* been set. Read_config_file will only set options with this value. Options
	* are processed in the following order: command line, user config file,
	* system config file. Last, fill_default_options is called.
	*/

	void
	initialize_options(Options * options)
	{
	memset(options, 'X', sizeof(*options));
	options->host_arg = NULL;
	options->forward_agent = -1;
	options->forward_agent_sock_path = NULL;
	options->forward_x11 = -1;
	options->forward_x11_trusted = -1;
	options->forward_x11_timeout = -1;
	options->stdio_forward_host = NULL;
	options->stdio_forward_port = 0;
	options->clear_forwardings = -1;
	options->exit_on_forward_failure = -1;
	options->xauth_location = NULL;
	options->fwd_opts.gateway_ports = -1;
	options->fwd_opts.streamlocal_bind_mask = (mode_t)-1;
	options->fwd_opts.streamlocal_bind_unlink = -1;
	options->pubkey_authentication = -1;
	options->gss_authentication = -1;
	options->gss_deleg_creds = -1;
	options->password_authentication = -1;
	options->kbd_interactive_authentication = -1;
	options->kbd_interactive_devices = NULL;
	options->hostbased_authentication = -1;
	options->batch_mode = -1;
	options->check_host_ip = -1;
	options->strict_host_key_checking = -1;
	options->compression = -1;
	options->tcp_keep_alive = -1;
	options->port = -1;
	options->address_family = -1;
	options->connection_attempts = -1;
	options->connection_timeout = -1;
	options->number_of_password_prompts = -1;
	options->ciphers = NULL;
	options->macs = NULL;
	options->kex_algorithms = NULL;
	options->hostkeyalgorithms = NULL;
	options->ca_sign_algorithms = NULL;
	options->num_identity_files = 0;
	memset(options->identity_keys, 0, sizeof(options->identity_keys));
	options->num_certificate_files = 0;
	memset(options->certificates, 0, sizeof(options->certificates));
	options->hostname = NULL;
	options->host_key_alias = NULL;
	options->proxy_command = NULL;
	options->jump_user = NULL;
	options->jump_host = NULL;
	options->jump_port = -1;
	options->jump_extra = NULL;
	options->user = NULL;
	options->escape_char = -1;
	options->num_system_hostfiles = 0;
	options->num_user_hostfiles = 0;
	options->local_forwards = NULL;
	options->num_local_forwards = 0;
	options->remote_forwards = NULL;
	options->num_remote_forwards = 0;
	options->permitted_remote_opens = NULL;
	options->num_permitted_remote_opens = 0;
	options->log_facility = SYSLOG_FACILITY_NOT_SET;
	options->log_level = SYSLOG_LEVEL_NOT_SET;
	options->num_log_verbose = 0;
	options->log_verbose = NULL;
	options->preferred_authentications = NULL;
	options->bind_address = NULL;
	options->bind_interface = NULL;
	options->pkcs11_provider = NULL;
	options->sk_provider = NULL;
	options->enable_ssh_keysign = - 1;
	options->no_host_authentication_for_localhost = - 1;
	options->identities_only = - 1;
	options->rekey_limit = - 1;
	options->rekey_interval = -1;
	options->verify_host_key_dns = -1;
	options->server_alive_interval = -1;
	options->server_alive_count_max = -1;
	options->send_env = NULL;
	options->num_send_env = 0;
	options->setenv = NULL;
	options->num_setenv = 0;
	options->control_path = NULL;
	options->control_master = -1;
	options->control_persist = -1;
	options->control_persist_timeout = 0;
	options->hash_known_hosts = -1;
	options->tun_open = -1;
	options->tun_local = -1;
	options->tun_remote = -1;
	options->local_command = NULL;
	options->permit_local_command = -1;
	options->remote_command = NULL;
	options->add_keys_to_agent = -1;
	options->add_keys_to_agent_lifespan = -1;
	options->identity_agent = NULL;
	options->visual_host_key = -1;
	options->ip_qos_interactive = -1;
	options->ip_qos_bulk = -1;
	options->request_tty = -1;
	options->session_type = -1;
	options->stdin_null = -1;
	options->fork_after_authentication = -1;
	options->proxy_use_fdpass = -1;
	options->ignored_unknown = NULL;
	options->num_canonical_domains = 0;
	options->num_permitted_cnames = 0;
	options->canonicalize_max_dots = -1;
	options->canonicalize_fallback_local = -1;
	options->canonicalize_hostname = -1;
	options->revoked_host_keys = NULL;
	options->fingerprint_hash = -1;
	options->update_hostkeys = -1;
	options->hostbased_accepted_algos = NULL;
	options->pubkey_accepted_algos = NULL;
	options->known_hosts_command = NULL;
	options->required_rsa_size = -1;
	options->enable_escape_commandline = -1;
	options->tag = NULL;
	}

	/*
	* A petite version of fill_default_options() that just fills the options
	* needed for hostname canonicalization to proceed.
	*/
	void
	fill_default_options_for_canonicalization(Options *options)
	{
	if (options->canonicalize_max_dots == -1)
	options->canonicalize_max_dots = 1;
	if (options->canonicalize_fallback_local == -1)
	options->canonicalize_fallback_local = 1;
	if (options->canonicalize_hostname == -1)
	options->canonicalize_hostname = SSH_CANONICALISE_NO;
	}

	/*
	* Called after processing other sources of option data, this fills those
	* options for which no value has been specified with their default values.
	*/
	int
	fill_default_options(Options * options)
	{
	char all_cipher, all_mac, all_kex, all_key, *all_sig;
	char def_cipher, def_mac, def_kex, def_key, *def_sig;
	int ret = 0, r;

	if (options->forward_agent == -1)
	options->forward_agent = 0;
	if (options->forward_x11 == -1)
	options->forward_x11 = 0;
	if (options->forward_x11_trusted == -1)
	options->forward_x11_trusted = 0;
	if (options->forward_x11_timeout == -1)
	options->forward_x11_timeout = 1200;
	/*
	* stdio forwarding (-W) changes the default for these but we defer
	* setting the values so they can be overridden.
	*/
	if (options->exit_on_forward_failure == -1)
	options->exit_on_forward_failure =
	options->stdio_forward_host != NULL ? 1 : 0;
	if (options->clear_forwardings == -1)
	options->clear_forwardings =
	options->stdio_forward_host != NULL ? 1 : 0;
	if (options->clear_forwardings == 1)
	clear_forwardings(options);

	if (options->xauth_location == NULL)
	options->xauth_location = xstrdup(_PATH_XAUTH);
	if (options->fwd_opts.gateway_ports == -1)
	options->fwd_opts.gateway_ports = 0;
	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->pubkey_authentication == -1)
	options->pubkey_authentication = SSH_PUBKEY_AUTH_ALL;
	if (options->gss_authentication == -1)
	options->gss_authentication = 0;
	if (options->gss_deleg_creds == -1)
	options->gss_deleg_creds = 0;
	if (options->password_authentication == -1)
	options->password_authentication = 1;
	if (options->kbd_interactive_authentication == -1)
	options->kbd_interactive_authentication = 1;
	if (options->hostbased_authentication == -1)
	options->hostbased_authentication = 0;
	if (options->batch_mode == -1)
	options->batch_mode = 0;
	if (options->check_host_ip == -1)
	options->check_host_ip = 0;
	if (options->strict_host_key_checking == -1)
	options->strict_host_key_checking = SSH_STRICT_HOSTKEY_ASK;
	if (options->compression == -1)
	options->compression = 0;
	if (options->tcp_keep_alive == -1)
	options->tcp_keep_alive = 1;
	if (options->port == -1)
	options->port = 0; /* Filled in ssh_connect. */
	if (options->address_family == -1)
	options->address_family = AF_UNSPEC;
	if (options->connection_attempts == -1)
	options->connection_attempts = 1;
	if (options->number_of_password_prompts == -1)
	options->number_of_password_prompts = 3;
	/* options->hostkeyalgorithms, default set in myproposals.h */
	if (options->add_keys_to_agent == -1) {
	options->add_keys_to_agent = 0;
	options->add_keys_to_agent_lifespan = 0;
	}
	if (options->num_identity_files == 0) {
	add_identity_file(options, "~/", _PATH_SSH_CLIENT_ID_RSA, 0);
	#ifdef OPENSSL_HAS_ECC
	add_identity_file(options, "~/", _PATH_SSH_CLIENT_ID_ECDSA, 0);
	add_identity_file(options, "~/",
	_PATH_SSH_CLIENT_ID_ECDSA_SK, 0);
	#endif
	add_identity_file(options, "~/",
	_PATH_SSH_CLIENT_ID_ED25519, 0);
	add_identity_file(options, "~/",
	_PATH_SSH_CLIENT_ID_ED25519_SK, 0);
	add_identity_file(options, "~/", _PATH_SSH_CLIENT_ID_XMSS, 0);
	add_identity_file(options, "~/", _PATH_SSH_CLIENT_ID_DSA, 0);
	}
	if (options->escape_char == -1)
	options->escape_char = '~';
	if (options->num_system_hostfiles == 0) {
	options->system_hostfiles[options->num_system_hostfiles++] =
	xstrdup(_PATH_SSH_SYSTEM_HOSTFILE);
	options->system_hostfiles[options->num_system_hostfiles++] =
	xstrdup(_PATH_SSH_SYSTEM_HOSTFILE2);
	}
	if (options->update_hostkeys == -1) {
	if (options->verify_host_key_dns <= 0 &&
	(options->num_user_hostfiles == 0 \|\|
	(options->num_user_hostfiles == 1 && strcmp(options->
	user_hostfiles[0], _PATH_SSH_USER_HOSTFILE) == 0)))
	options->update_hostkeys = SSH_UPDATE_HOSTKEYS_YES;
	else
	options->update_hostkeys = SSH_UPDATE_HOSTKEYS_NO;
	}
	if (options->num_user_hostfiles == 0) {
	options->user_hostfiles[options->num_user_hostfiles++] =
	xstrdup(_PATH_SSH_USER_HOSTFILE);
	options->user_hostfiles[options->num_user_hostfiles++] =
	xstrdup(_PATH_SSH_USER_HOSTFILE2);
	}
	if (options->log_level == SYSLOG_LEVEL_NOT_SET)
	options->log_level = SYSLOG_LEVEL_INFO;
	if (options->log_facility == SYSLOG_FACILITY_NOT_SET)
	options->log_facility = SYSLOG_FACILITY_USER;
	if (options->no_host_authentication_for_localhost == - 1)
	options->no_host_authentication_for_localhost = 0;
	if (options->identities_only == -1)
	options->identities_only = 0;
	if (options->enable_ssh_keysign == -1)
	options->enable_ssh_keysign = 0;
	if (options->rekey_limit == -1)
	options->rekey_limit = 0;
	if (options->rekey_interval == -1)
	options->rekey_interval = 0;
	if (options->verify_host_key_dns == -1)
	options->verify_host_key_dns = 0;
	if (options->server_alive_interval == -1)
	options->server_alive_interval = 0;
	if (options->server_alive_count_max == -1)
	options->server_alive_count_max = 3;
	if (options->control_master == -1)
	options->control_master = 0;
	if (options->control_persist == -1) {
	options->control_persist = 0;
	options->control_persist_timeout = 0;
	}
	if (options->hash_known_hosts == -1)
	options->hash_known_hosts = 0;
	if (options->tun_open == -1)
	options->tun_open = SSH_TUNMODE_NO;
	if (options->tun_local == -1)
	options->tun_local = SSH_TUNID_ANY;
	if (options->tun_remote == -1)
	options->tun_remote = SSH_TUNID_ANY;
	if (options->permit_local_command == -1)
	options->permit_local_command = 0;
	if (options->visual_host_key == -1)
	options->visual_host_key = 0;
	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->request_tty == -1)
	options->request_tty = REQUEST_TTY_AUTO;
	if (options->session_type == -1)
	options->session_type = SESSION_TYPE_DEFAULT;
	if (options->stdin_null == -1)
	options->stdin_null = 0;
	if (options->fork_after_authentication == -1)
	options->fork_after_authentication = 0;
	if (options->proxy_use_fdpass == -1)
	options->proxy_use_fdpass = 0;
	if (options->canonicalize_max_dots == -1)
	options->canonicalize_max_dots = 1;
	if (options->canonicalize_fallback_local == -1)
	options->canonicalize_fallback_local = 1;
	if (options->canonicalize_hostname == -1)
	options->canonicalize_hostname = SSH_CANONICALISE_NO;
	if (options->fingerprint_hash == -1)
	options->fingerprint_hash = SSH_FP_HASH_DEFAULT;
	#ifdef ENABLE_SK_INTERNAL
	if (options->sk_provider == NULL)
	options->sk_provider = xstrdup("internal");
	#else
	if (options->sk_provider == NULL)
	options->sk_provider = xstrdup("$SSH_SK_PROVIDER");
	#endif
	if (options->required_rsa_size == -1)
	options->required_rsa_size = SSH_RSA_MINIMUM_MODULUS_SIZE;
	if (options->enable_escape_commandline == -1)
	options->enable_escape_commandline = 0;

	/* Expand KEX name lists */
	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_CLIENT_ENCRYPT, all_cipher);
	def_mac = match_filter_allowlist(KEX_CLIENT_MAC, all_mac);
	def_kex = match_filter_allowlist(KEX_CLIENT_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(&options->what, \
	defaults, all)) != 0) { \
	error_fr(r, "%s", #what); \
	goto fail; \
	} \
	} while (0)
	ASSEMBLE(ciphers, def_cipher, all_cipher);
	ASSEMBLE(macs, def_mac, all_mac);
	ASSEMBLE(kex_algorithms, def_kex, all_kex);
	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

	#define CLEAR_ON_NONE(v) \
	do { \
	if (option_clear_or_none(v)) { \
	free(v); \
	v = NULL; \
	} \
	} while(0)
	CLEAR_ON_NONE(options->local_command);
	CLEAR_ON_NONE(options->remote_command);
	CLEAR_ON_NONE(options->proxy_command);
	CLEAR_ON_NONE(options->control_path);
	CLEAR_ON_NONE(options->revoked_host_keys);
	CLEAR_ON_NONE(options->pkcs11_provider);
	CLEAR_ON_NONE(options->sk_provider);
	CLEAR_ON_NONE(options->known_hosts_command);
	if (options->jump_host != NULL &&
	strcmp(options->jump_host, "none") == 0 &&
	options->jump_port == 0 && options->jump_user == NULL) {
	free(options->jump_host);
	options->jump_host = NULL;
	}
	if (options->num_permitted_cnames == 1 &&
	!config_has_permitted_cnames(options)) {
	/* clean up CanonicalizePermittedCNAMEs=none */
	free(options->permitted_cnames[0].source_list);
	free(options->permitted_cnames[0].target_list);
	memset(options->permitted_cnames, '\0',
	sizeof(*options->permitted_cnames));
	options->num_permitted_cnames = 0;
	}
	/* options->identity_agent distinguishes NULL from 'none' */
	/* options->user will be set in the main program if appropriate */
	/* options->hostname will be set in the main program if appropriate */
	/* options->host_key_alias should not be set by default */
	/* options->preferred_authentications will be set in ssh */

	/* success */
	ret = 0;
	fail:
	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);
	return ret;
	}

	void
	free_options(Options *o)
	{
	int i;

	if (o == NULL)
	return;

	#define FREE_ARRAY(type, n, a) \
	do { \
	type _i; \
	for (_i = 0; _i < (n); _i++) \
	free((a)[_i]); \
	} while (0)

	free(o->forward_agent_sock_path);
	free(o->xauth_location);
	FREE_ARRAY(u_int, o->num_log_verbose, o->log_verbose);
	free(o->log_verbose);
	free(o->ciphers);
	free(o->macs);
	free(o->hostkeyalgorithms);
	free(o->kex_algorithms);
	free(o->ca_sign_algorithms);
	free(o->hostname);
	free(o->host_key_alias);
	free(o->proxy_command);
	free(o->user);
	FREE_ARRAY(u_int, o->num_system_hostfiles, o->system_hostfiles);
	FREE_ARRAY(u_int, o->num_user_hostfiles, o->user_hostfiles);
	free(o->preferred_authentications);
	free(o->bind_address);
	free(o->bind_interface);
	free(o->pkcs11_provider);
	free(o->sk_provider);
	for (i = 0; i < o->num_identity_files; i++) {
	free(o->identity_files[i]);
	sshkey_free(o->identity_keys[i]);
	}
	for (i = 0; i < o->num_certificate_files; i++) {
	free(o->certificate_files[i]);
	sshkey_free(o->certificates[i]);
	}
	free(o->identity_agent);
	for (i = 0; i < o->num_local_forwards; i++) {
	free(o->local_forwards[i].listen_host);
	free(o->local_forwards[i].listen_path);
	free(o->local_forwards[i].connect_host);
	free(o->local_forwards[i].connect_path);
	}
	free(o->local_forwards);
	for (i = 0; i < o->num_remote_forwards; i++) {
	free(o->remote_forwards[i].listen_host);
	free(o->remote_forwards[i].listen_path);
	free(o->remote_forwards[i].connect_host);
	free(o->remote_forwards[i].connect_path);
	}
	free(o->remote_forwards);
	free(o->stdio_forward_host);
	FREE_ARRAY(u_int, o->num_send_env, o->send_env);
	free(o->send_env);
	FREE_ARRAY(u_int, o->num_setenv, o->setenv);
	free(o->setenv);
	free(o->control_path);
	free(o->local_command);
	free(o->remote_command);
	FREE_ARRAY(int, o->num_canonical_domains, o->canonical_domains);
	for (i = 0; i < o->num_permitted_cnames; i++) {
	free(o->permitted_cnames[i].source_list);
	free(o->permitted_cnames[i].target_list);
	}
	free(o->revoked_host_keys);
	free(o->hostbased_accepted_algos);
	free(o->pubkey_accepted_algos);
	free(o->jump_user);
	free(o->jump_host);
	free(o->jump_extra);
	free(o->ignored_unknown);
	explicit_bzero(o, sizeof(*o));
	#undef FREE_ARRAY
	}

	struct fwdarg {
	char *arg;
	int ispath;
	};

	/*
	* parse_fwd_field
	* parses the next field in a port forwarding specification.
	* sets fwd to the parsed field and advances p past the colon
	* or sets it to NULL at end of string.
	* returns 0 on success, else non-zero.
	*/
	static int
	parse_fwd_field(char *p, struct fwdarg fwd)
	{
	char ep, cp = *p;
	int ispath = 0;

	if (*cp == '\0') {
	*p = NULL;
	return -1; /* end of string */
	}

	/*
	* A field escaped with square brackets is used literally.
	* XXX - allow ']' to be escaped via backslash?
	*/
	if (*cp == '[') {
	/* find matching ']' */
	for (ep = cp + 1; ep != ']' && ep != '\0'; ep++) {
	if (*ep == '/')
	ispath = 1;
	}
	/* no matching ']' or not at end of field. */
	if (ep[0] != ']' \|\| (ep[1] != ':' && ep[1] != '\0'))
	return -1;
	/* NUL terminate the field and advance p past the colon */
	*ep++ = '\0';
	if (*ep != '\0')
	*ep++ = '\0';
	fwd->arg = cp + 1;
	fwd->ispath = ispath;
	*p = ep;
	return 0;
	}

	for (cp = p; cp != '\0'; cp++) {
	switch (*cp) {
	case '\\':
	memmove(cp, cp + 1, strlen(cp + 1) + 1);
	if (*cp == '\0')
	return -1;
	break;
	case '/':
	ispath = 1;
	break;
	case ':':
	*cp++ = '\0';
	goto done;
	}
	}
	done:
	fwd->arg = *p;
	fwd->ispath = ispath;
	*p = cp;
	return 0;
	}

	/*
	* parse_forward
	* parses a string containing a port forwarding specification of the form:
	* dynamicfwd == 0
	* [listenhost:]listenport\|listenpath:connecthost:connectport\|connectpath
	* listenpath:connectpath
	* dynamicfwd == 1
	* [listenhost:]listenport
	* returns number of arguments parsed or zero on error
	*/
	int
	parse_forward(struct Forward fwd, const char fwdspec, int dynamicfwd, int remotefwd)
	{
	struct fwdarg fwdargs[4];
	char p, cp;
	int i, err;

	memset(fwd, 0, sizeof(*fwd));
	memset(fwdargs, 0, sizeof(fwdargs));

	/*
	* We expand environment variables before checking if we think they're
	* paths so that if ${VAR} expands to a fully qualified path it is
	* treated as a path.
	*/
	cp = p = dollar_expand(&err, fwdspec);
	if (p == NULL \|\| err)
	return 0;

	/* skip leading spaces */
	while (isspace((u_char)*cp))
	cp++;

	for (i = 0; i < 4; ++i) {
	if (parse_fwd_field(&cp, &fwdargs[i]) != 0)
	break;
	}

	/* Check for trailing garbage */
	if (cp != NULL && *cp != '\0') {
	i = 0; /* failure */
	}

	switch (i) {
	case 1:
	if (fwdargs[0].ispath) {
	fwd->listen_path = xstrdup(fwdargs[0].arg);
	fwd->listen_port = PORT_STREAMLOCAL;
	} else {
	fwd->listen_host = NULL;
	fwd->listen_port = a2port(fwdargs[0].arg);
	}
	fwd->connect_host = xstrdup("socks");
	break;

	case 2:
	if (fwdargs[0].ispath && fwdargs[1].ispath) {
	fwd->listen_path = xstrdup(fwdargs[0].arg);
	fwd->listen_port = PORT_STREAMLOCAL;
	fwd->connect_path = xstrdup(fwdargs[1].arg);
	fwd->connect_port = PORT_STREAMLOCAL;
	} else if (fwdargs[1].ispath) {
	fwd->listen_host = NULL;
	fwd->listen_port = a2port(fwdargs[0].arg);
	fwd->connect_path = xstrdup(fwdargs[1].arg);
	fwd->connect_port = PORT_STREAMLOCAL;
	} else {
	fwd->listen_host = xstrdup(fwdargs[0].arg);
	fwd->listen_port = a2port(fwdargs[1].arg);
	fwd->connect_host = xstrdup("socks");
	}
	break;

	case 3:
	if (fwdargs[0].ispath) {
	fwd->listen_path = xstrdup(fwdargs[0].arg);
	fwd->listen_port = PORT_STREAMLOCAL;
	fwd->connect_host = xstrdup(fwdargs[1].arg);
	fwd->connect_port = a2port(fwdargs[2].arg);
	} else if (fwdargs[2].ispath) {
	fwd->listen_host = xstrdup(fwdargs[0].arg);
	fwd->listen_port = a2port(fwdargs[1].arg);
	fwd->connect_path = xstrdup(fwdargs[2].arg);
	fwd->connect_port = PORT_STREAMLOCAL;
	} else {
	fwd->listen_host = NULL;
	fwd->listen_port = a2port(fwdargs[0].arg);
	fwd->connect_host = xstrdup(fwdargs[1].arg);
	fwd->connect_port = a2port(fwdargs[2].arg);
	}
	break;

	case 4:
	fwd->listen_host = xstrdup(fwdargs[0].arg);
	fwd->listen_port = a2port(fwdargs[1].arg);
	fwd->connect_host = xstrdup(fwdargs[2].arg);
	fwd->connect_port = a2port(fwdargs[3].arg);
	break;
	default:
	i = 0; /* failure */
	}

	free(p);

	if (dynamicfwd) {
	if (!(i == 1 \|\| i == 2))
	goto fail_free;
	} else {
	if (!(i == 3 \|\| i == 4)) {
	if (fwd->connect_path == NULL &&
	fwd->listen_path == NULL)
	goto fail_free;
	}
	if (fwd->connect_port <= 0 && fwd->connect_path == NULL)
	goto fail_free;
	}

	if ((fwd->listen_port < 0 && fwd->listen_path == NULL) \|\|
	(!remotefwd && fwd->listen_port == 0))
	goto fail_free;
	if (fwd->connect_host != NULL &&
	strlen(fwd->connect_host) >= NI_MAXHOST)
	goto fail_free;
	/*
	* XXX - if connecting to a remote socket, max sun len may not
	* match this host
	*/
	if (fwd->connect_path != NULL &&
	strlen(fwd->connect_path) >= PATH_MAX_SUN)
	goto fail_free;
	if (fwd->listen_host != NULL &&
	strlen(fwd->listen_host) >= NI_MAXHOST)
	goto fail_free;
	if (fwd->listen_path != NULL &&
	strlen(fwd->listen_path) >= PATH_MAX_SUN)
	goto fail_free;

	return (i);

	fail_free:
	free(fwd->connect_host);
	fwd->connect_host = NULL;
	free(fwd->connect_path);
	fwd->connect_path = NULL;
	free(fwd->listen_host);
	fwd->listen_host = NULL;
	free(fwd->listen_path);
	fwd->listen_path = NULL;
	return (0);
	}

	int
	parse_jump(const char s, Options o, int active)
	{
	char orig, sdup, *cp;
	char host = NULL, user = NULL;
	int r, ret = -1, port = -1, first;

	active &= o->proxy_command == NULL && o->jump_host == NULL;

	orig = sdup = xstrdup(s);

	/* Remove comment and trailing whitespace */
	if ((cp = strchr(orig, '#')) != NULL)
	*cp = '\0';
	rtrim(orig);

	first = active;
	do {
	if (strcasecmp(s, "none") == 0)
	break;
	if ((cp = strrchr(sdup, ',')) == NULL)
	cp = sdup; /* last */
	else
	*cp++ = '\0';

	if (first) {
	/* First argument and configuration is active */
	r = parse_ssh_uri(cp, &user, &host, &port);
	if (r == -1 \|\| (r == 1 &&
	parse_user_host_port(cp, &user, &host, &port) != 0))
	goto out;
	} else {
	/* Subsequent argument or inactive configuration */
	r = parse_ssh_uri(cp, NULL, NULL, NULL);
	if (r == -1 \|\| (r == 1 &&
	parse_user_host_port(cp, NULL, NULL, NULL) != 0))
	goto out;
	}
	first = 0; /* only check syntax for subsequent hosts */
	} while (cp != sdup);
	/* success */
	if (active) {
	if (strcasecmp(s, "none") == 0) {
	o->jump_host = xstrdup("none");
	o->jump_port = 0;
	} else {
	o->jump_user = user;
	o->jump_host = host;
	o->jump_port = port;
	o->proxy_command = xstrdup("none");
	user = host = NULL;
	if ((cp = strrchr(s, ',')) != NULL && cp != s) {
	o->jump_extra = xstrdup(s);
	o->jump_extra[cp - s] = '\0';
	}
	}
	}
	ret = 0;
	out:
	free(orig);
	free(user);
	free(host);
	return ret;
	}

	int
	parse_ssh_uri(const char uri, char userp, char hostp, int portp)
	{
	char user = NULL, host = NULL, *path = NULL;
	int r, port;

	r = parse_uri("ssh", uri, &user, &host, &port, &path);
	if (r == 0 && path != NULL)
	r = -1; /* path not allowed */
	if (r == 0) {
	if (userp != NULL) {
	*userp = user;
	user = NULL;
	}
	if (hostp != NULL) {
	*hostp = host;
	host = NULL;
	}
	if (portp != NULL)
	*portp = port;
	}
	free(user);
	free(host);
	free(path);
	return r;
	}

	/* XXX the following is a near-vebatim copy from servconf.c; refactor */
	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(OpCodes code, int val)
	{
	if (val == -1)
	return "unset";
	switch (code) {
	case oAddressFamily:
	return fmt_multistate_int(val, multistate_addressfamily);
	case oVerifyHostKeyDNS:
	case oUpdateHostkeys:
	return fmt_multistate_int(val, multistate_yesnoask);
	case oStrictHostKeyChecking:
	return fmt_multistate_int(val, multistate_strict_hostkey);
	case oControlMaster:
	return fmt_multistate_int(val, multistate_controlmaster);
	case oTunnel:
	return fmt_multistate_int(val, multistate_tunnel);
	case oRequestTTY:
	return fmt_multistate_int(val, multistate_requesttty);
	case oSessionType:
	return fmt_multistate_int(val, multistate_sessiontype);
	case oCanonicalizeHostname:
	return fmt_multistate_int(val, multistate_canonicalizehostname);
	case oAddKeysToAgent:
	return fmt_multistate_int(val, multistate_yesnoaskconfirm);
	case oPubkeyAuthentication:
	return fmt_multistate_int(val, multistate_pubkey_auth);
	case oFingerprintHash:
	return ssh_digest_alg_name(val);
	default:
	switch (val) {
	case 0:
	return "no";
	case 1:
	return "yes";
	default:
	return "UNKNOWN";
	}
	}
	}

	static const char *
	lookup_opcode_name(OpCodes code)
	{
	u_int i;

	for (i = 0; keywords[i].name != NULL; i++)
	if (keywords[i].opcode == code)
	return(keywords[i].name);
	return "UNKNOWN";
	}

	static void
	dump_cfg_int(OpCodes code, int val)
	{
	printf("%s %d\n", lookup_opcode_name(code), val);
	}

	static void
	dump_cfg_fmtint(OpCodes code, int val)
	{
	printf("%s %s\n", lookup_opcode_name(code), fmt_intarg(code, val));
	}

	static void
	dump_cfg_string(OpCodes code, const char *val)
	{
	if (val == NULL)
	return;
	printf("%s %s\n", lookup_opcode_name(code), val);
	}

	static void
	dump_cfg_strarray(OpCodes 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(OpCodes code, u_int count, char **vals)
	{
	u_int i;

	printf("%s", lookup_opcode_name(code));
	if (count == 0)
	printf(" none");
	for (i = 0; i < count; i++)
	printf(" %s", vals[i]);
	printf("\n");
	}

	static void
	dump_cfg_forwards(OpCodes code, u_int count, const struct Forward *fwds)
	{
	const struct Forward *fwd;
	u_int i;

	/* oDynamicForward */
	for (i = 0; i < count; i++) {
	fwd = &fwds[i];
	if (code == oDynamicForward && fwd->connect_host != NULL &&
	strcmp(fwd->connect_host, "socks") != 0)
	continue;
	if (code == oLocalForward && fwd->connect_host != NULL &&
	strcmp(fwd->connect_host, "socks") == 0)
	continue;
	printf("%s", lookup_opcode_name(code));
	if (fwd->listen_port == PORT_STREAMLOCAL)
	printf(" %s", fwd->listen_path);
	else if (fwd->listen_host == NULL)
	printf(" %d", fwd->listen_port);
	else {
	printf(" [%s]:%d",
	fwd->listen_host, fwd->listen_port);
	}
	if (code != oDynamicForward) {
	if (fwd->connect_port == PORT_STREAMLOCAL)
	printf(" %s", fwd->connect_path);
	else if (fwd->connect_host == NULL)
	printf(" %d", fwd->connect_port);
	else {
	printf(" [%s]:%d",
	fwd->connect_host, fwd->connect_port);
	}
	}
	printf("\n");
	}
	}

	void
	dump_client_config(Options o, const char host)
	{
	int i, r;
	char buf[8], *all_key;

	/*
	* Expand HostKeyAlgorithms name lists. This isn't handled in
	* fill_default_options() like the other algorithm lists because
	* the host key algorithms are by default dynamically chosen based
	* on the host's keys found in known_hosts.
	*/
	all_key = sshkey_alg_list(0, 0, 1, ',');
	if ((r = kex_assemble_names(&o->hostkeyalgorithms, kex_default_pk_alg(),
	all_key)) != 0)
	fatal_fr(r, "expand HostKeyAlgorithms");
	free(all_key);

	/* Most interesting options first: user, host, port */
	dump_cfg_string(oHost, o->host_arg);
	dump_cfg_string(oUser, o->user);
	dump_cfg_string(oHostname, host);
	dump_cfg_int(oPort, o->port);

	/* Flag options */
	dump_cfg_fmtint(oAddressFamily, o->address_family);
	dump_cfg_fmtint(oBatchMode, o->batch_mode);
	dump_cfg_fmtint(oCanonicalizeFallbackLocal, o->canonicalize_fallback_local);
	dump_cfg_fmtint(oCanonicalizeHostname, o->canonicalize_hostname);
	dump_cfg_fmtint(oCheckHostIP, o->check_host_ip);
	dump_cfg_fmtint(oCompression, o->compression);
	dump_cfg_fmtint(oControlMaster, o->control_master);
	dump_cfg_fmtint(oEnableSSHKeysign, o->enable_ssh_keysign);
	dump_cfg_fmtint(oClearAllForwardings, o->clear_forwardings);
	dump_cfg_fmtint(oExitOnForwardFailure, o->exit_on_forward_failure);
	dump_cfg_fmtint(oFingerprintHash, o->fingerprint_hash);
	dump_cfg_fmtint(oForwardX11, o->forward_x11);
	dump_cfg_fmtint(oForwardX11Trusted, o->forward_x11_trusted);
	dump_cfg_fmtint(oGatewayPorts, o->fwd_opts.gateway_ports);
	#ifdef GSSAPI
	dump_cfg_fmtint(oGssAuthentication, o->gss_authentication);
	dump_cfg_fmtint(oGssDelegateCreds, o->gss_deleg_creds);
	#endif /* GSSAPI */
	dump_cfg_fmtint(oHashKnownHosts, o->hash_known_hosts);
	dump_cfg_fmtint(oHostbasedAuthentication, o->hostbased_authentication);
	dump_cfg_fmtint(oIdentitiesOnly, o->identities_only);
	dump_cfg_fmtint(oKbdInteractiveAuthentication, o->kbd_interactive_authentication);
	dump_cfg_fmtint(oNoHostAuthenticationForLocalhost, o->no_host_authentication_for_localhost);
	dump_cfg_fmtint(oPasswordAuthentication, o->password_authentication);
	dump_cfg_fmtint(oPermitLocalCommand, o->permit_local_command);
	dump_cfg_fmtint(oProxyUseFdpass, o->proxy_use_fdpass);
	dump_cfg_fmtint(oPubkeyAuthentication, o->pubkey_authentication);
	dump_cfg_fmtint(oRequestTTY, o->request_tty);
	dump_cfg_fmtint(oSessionType, o->session_type);
	dump_cfg_fmtint(oStdinNull, o->stdin_null);
	dump_cfg_fmtint(oForkAfterAuthentication, o->fork_after_authentication);
	dump_cfg_fmtint(oStreamLocalBindUnlink, o->fwd_opts.streamlocal_bind_unlink);
	dump_cfg_fmtint(oStrictHostKeyChecking, o->strict_host_key_checking);
	dump_cfg_fmtint(oTCPKeepAlive, o->tcp_keep_alive);
	dump_cfg_fmtint(oTunnel, o->tun_open);
	dump_cfg_fmtint(oVerifyHostKeyDNS, o->verify_host_key_dns);
	dump_cfg_fmtint(oVisualHostKey, o->visual_host_key);
	dump_cfg_fmtint(oUpdateHostkeys, o->update_hostkeys);
	dump_cfg_fmtint(oEnableEscapeCommandline, o->enable_escape_commandline);

	/* Integer options */
	dump_cfg_int(oCanonicalizeMaxDots, o->canonicalize_max_dots);
	dump_cfg_int(oConnectionAttempts, o->connection_attempts);
	dump_cfg_int(oForwardX11Timeout, o->forward_x11_timeout);
	dump_cfg_int(oNumberOfPasswordPrompts, o->number_of_password_prompts);
	dump_cfg_int(oServerAliveCountMax, o->server_alive_count_max);
	dump_cfg_int(oServerAliveInterval, o->server_alive_interval);
	dump_cfg_int(oRequiredRSASize, o->required_rsa_size);

	/* String options */
	dump_cfg_string(oBindAddress, o->bind_address);
	dump_cfg_string(oBindInterface, o->bind_interface);
	dump_cfg_string(oCiphers, o->ciphers);
	dump_cfg_string(oControlPath, o->control_path);
	dump_cfg_string(oHostKeyAlgorithms, o->hostkeyalgorithms);
	dump_cfg_string(oHostKeyAlias, o->host_key_alias);
	dump_cfg_string(oHostbasedAcceptedAlgorithms, o->hostbased_accepted_algos);
	dump_cfg_string(oIdentityAgent, o->identity_agent);
	dump_cfg_string(oIgnoreUnknown, o->ignored_unknown);
	dump_cfg_string(oKbdInteractiveDevices, o->kbd_interactive_devices);
	dump_cfg_string(oKexAlgorithms, o->kex_algorithms);
	dump_cfg_string(oCASignatureAlgorithms, o->ca_sign_algorithms);
	dump_cfg_string(oLocalCommand, o->local_command);
	dump_cfg_string(oRemoteCommand, o->remote_command);
	dump_cfg_string(oLogLevel, log_level_name(o->log_level));
	dump_cfg_string(oMacs, o->macs);
	#ifdef ENABLE_PKCS11
	dump_cfg_string(oPKCS11Provider, o->pkcs11_provider);
	#endif
	dump_cfg_string(oSecurityKeyProvider, o->sk_provider);
	dump_cfg_string(oPreferredAuthentications, o->preferred_authentications);
	dump_cfg_string(oPubkeyAcceptedAlgorithms, o->pubkey_accepted_algos);
	dump_cfg_string(oRevokedHostKeys, o->revoked_host_keys);
	dump_cfg_string(oXAuthLocation, o->xauth_location);
	dump_cfg_string(oKnownHostsCommand, o->known_hosts_command);
	dump_cfg_string(oTag, o->tag);

	/* Forwards */
	dump_cfg_forwards(oDynamicForward, o->num_local_forwards, o->local_forwards);
	dump_cfg_forwards(oLocalForward, o->num_local_forwards, o->local_forwards);
	dump_cfg_forwards(oRemoteForward, o->num_remote_forwards, o->remote_forwards);

	/* String array options */
	dump_cfg_strarray(oIdentityFile, o->num_identity_files, o->identity_files);
	dump_cfg_strarray_oneline(oCanonicalDomains, o->num_canonical_domains, o->canonical_domains);
	dump_cfg_strarray(oCertificateFile, o->num_certificate_files, o->certificate_files);
	dump_cfg_strarray_oneline(oGlobalKnownHostsFile, o->num_system_hostfiles, o->system_hostfiles);
	dump_cfg_strarray_oneline(oUserKnownHostsFile, o->num_user_hostfiles, o->user_hostfiles);
	dump_cfg_strarray(oSendEnv, o->num_send_env, o->send_env);
	dump_cfg_strarray(oSetEnv, o->num_setenv, o->setenv);
	dump_cfg_strarray_oneline(oLogVerbose,
	o->num_log_verbose, o->log_verbose);

	/* Special cases */

	/* PermitRemoteOpen */
	if (o->num_permitted_remote_opens == 0)
	printf("%s any\n", lookup_opcode_name(oPermitRemoteOpen));
	else
	dump_cfg_strarray_oneline(oPermitRemoteOpen,
	o->num_permitted_remote_opens, o->permitted_remote_opens);

	/* AddKeysToAgent */
	if (o->add_keys_to_agent_lifespan <= 0)
	dump_cfg_fmtint(oAddKeysToAgent, o->add_keys_to_agent);
	else {
	printf("addkeystoagent%s %d\n",
	o->add_keys_to_agent == 3 ? " confirm" : "",
	o->add_keys_to_agent_lifespan);
	}

	/* oForwardAgent */
	if (o->forward_agent_sock_path == NULL)
	dump_cfg_fmtint(oForwardAgent, o->forward_agent);
	else
	dump_cfg_string(oForwardAgent, o->forward_agent_sock_path);

	/* oConnectTimeout */
	if (o->connection_timeout == -1)
	printf("connecttimeout none\n");
	else
	dump_cfg_int(oConnectTimeout, o->connection_timeout);

	/* oTunnelDevice */
	printf("tunneldevice");
	if (o->tun_local == SSH_TUNID_ANY)
	printf(" any");
	else
	printf(" %d", o->tun_local);
	if (o->tun_remote == SSH_TUNID_ANY)
	printf(":any");
	else
	printf(":%d", o->tun_remote);
	printf("\n");

	/* oCanonicalizePermittedCNAMEs */
	printf("canonicalizePermittedcnames");
	if (o->num_permitted_cnames == 0)
	printf(" none");
	for (i = 0; i < o->num_permitted_cnames; i++) {
	printf(" %s:%s", o->permitted_cnames[i].source_list,
	o->permitted_cnames[i].target_list);
	}
	printf("\n");

	/* oControlPersist */
	if (o->control_persist == 0 \|\| o->control_persist_timeout == 0)
	dump_cfg_fmtint(oControlPersist, o->control_persist);
	else
	dump_cfg_int(oControlPersist, o->control_persist_timeout);

	/* oEscapeChar */
	if (o->escape_char == SSH_ESCAPECHAR_NONE)
	printf("escapechar none\n");
	else {
	vis(buf, o->escape_char, VIS_WHITE, 0);
	printf("escapechar %s\n", buf);
	}

	/* oIPQoS */
	printf("ipqos %s ", iptos2str(o->ip_qos_interactive));
	printf("%s\n", iptos2str(o->ip_qos_bulk));

	/* oRekeyLimit */
	printf("rekeylimit %llu %d\n",
	(unsigned long long)o->rekey_limit, o->rekey_interval);

	/* oStreamLocalBindMask */
	printf("streamlocalbindmask 0%o\n",
	o->fwd_opts.streamlocal_bind_mask);

	/* oLogFacility */
	printf("syslogfacility %s\n", log_facility_name(o->log_facility));

	/* oProxyCommand / oProxyJump */
	if (o->jump_host == NULL)
	dump_cfg_string(oProxyCommand, o->proxy_command);
	else {
	/* Check for numeric addresses */
	i = strchr(o->jump_host, ':') != NULL \|\|
	strspn(o->jump_host, "1234567890.") == strlen(o->jump_host);
	snprintf(buf, sizeof(buf), "%d", o->jump_port);
	printf("proxyjump %s%s%s%s%s%s%s%s%s\n",
	/* optional additional jump spec */
	o->jump_extra == NULL ? "" : o->jump_extra,
	o->jump_extra == NULL ? "" : ",",
	/* optional user */
	o->jump_user == NULL ? "" : o->jump_user,
	o->jump_user == NULL ? "" : "@",
	/* opening [ if hostname is numeric */
	i ? "[" : "",
	/* mandatory hostname */
	o->jump_host,
	/* closing ] if hostname is numeric */
	i ? "]" : "",
	/* optional port number */
	o->jump_port <= 0 ? "" : ":",
	o->jump_port <= 0 ? "" : buf);
	}
	}

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