Adding upstream version 1:9.2p1.upstream/1%9.2p1upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 3486 insertions, 0 deletions

diff --git a/readconf.c b/readconf.c
new file mode 100644
index 0000000..cf79498
--- /dev/null
+++ b/readconf.c
@@ -0,0 +1,3486 @@
+/* $OpenBSD: readconf.c,v 1.372 2023/01/13 02:58:20 dtucker 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 <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>
+#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 "compat.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,
+	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 },
+	{ "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 },
+
+	{ 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);
+}
+
+/*
+ * 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, "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 \"%.100s\"' ",
+		    filename, linenum, this_result ? "": "not ",
+		    oattrib, criteria);
+		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;
+	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 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;
+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)) {
+			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;
+		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);
+					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;
+		goto parse_pubkey_algos;
+
+	case oPubkeyAcceptedAlgorithms:
+		charptr = &options->pubkey_accepted_algos;
+		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 ||
+			    value2 > INT_MAX) {
+				error("%s line %d: invalid time value.",
+				    filename, linenum);
+				goto out;
+			}
+		} else if (value == -1 && arg2 == NULL) {
+			if ((value2 = convtime(arg)) == -1 ||
+			    value2 > INT_MAX) {
+				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;
+}
+
+/*
+ * 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);
+
+	/* 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);
+	}
+}