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+/* $OpenBSD: readconf.c,v 1.335 2020/08/27 02:11:09 djm Exp $ */
+/*
+ * Author: Tatu Ylonen <ylo@cs.hut.fi>
+ * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
+ * All rights reserved
+ * Functions for reading the configuration files.
+ *
+ * As far as I am concerned, the code I have written for this software
+ * can be used freely for any purpose. Any derived versions of this
+ * software must be clearly marked as such, and if the derived work is
+ * incompatible with the protocol description in the RFC file, it must be
+ * called by a name other than "ssh" or "Secure Shell".
+ */
+
+#include "includes.h"
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/socket.h>
+#include <sys/wait.h>
+#include <sys/un.h>
+
+#include <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,
+ oChallengeResponseAuthentication, oXAuthLocation,
+ oIdentityFile, oHostname, oPort, oRemoteForward, oLocalForward,
+ oCertificateFile, oAddKeysToAgent, oIdentityAgent,
+ oUser, oEscapeChar, oProxyCommand,
+ oGlobalKnownHostsFile, oUserKnownHostsFile, oConnectionAttempts,
+ oBatchMode, oCheckHostIP, oStrictHostKeyChecking, oCompression,
+ oTCPKeepAlive, oNumberOfPasswordPrompts,
+ oLogFacility, oLogLevel, 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, oIgnoreUnknown, oProxyUseFdpass,
+ oCanonicalDomains, oCanonicalizeHostname, oCanonicalizeMaxDots,
+ oCanonicalizeFallbackLocal, oCanonicalizePermittedCNAMEs,
+ oStreamLocalBindMask, oStreamLocalBindUnlink, oRevokedHostKeys,
+ oFingerprintHash, oUpdateHostkeys, oHostbasedKeyTypes,
+ oPubkeyAcceptedKeyTypes, oCASignatureAlgorithms, oProxyJump,
+ oSecurityKeyProvider,
+ 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 },
+ { "pubkeyauthentication", oPubkeyAuthentication },
+ { "dsaauthentication", oPubkeyAuthentication }, /* alias */
+ { "hostbasedauthentication", oHostbasedAuthentication },
+ { "challengeresponseauthentication", oChallengeResponseAuthentication },
+ { "skeyauthentication", oUnsupported },
+ { "tisauthentication", oChallengeResponseAuthentication }, /* alias */
+ { "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 },
+ { "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 },
+ { "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 },
+ { "proxyusefdpass", oProxyUseFdpass },
+ { "canonicaldomains", oCanonicalDomains },
+ { "canonicalizefallbacklocal", oCanonicalizeFallbackLocal },
+ { "canonicalizehostname", oCanonicalizeHostname },
+ { "canonicalizemaxdots", oCanonicalizeMaxDots },
+ { "canonicalizepermittedcnames", oCanonicalizePermittedCNAMEs },
+ { "streamlocalbindmask", oStreamLocalBindMask },
+ { "streamlocalbindunlink", oStreamLocalBindUnlink },
+ { "revokedhostkeys", oRevokedHostKeys },
+ { "fingerprinthash", oFingerprintHash },
+ { "updatehostkeys", oUpdateHostkeys },
+ { "hostbasedkeytypes", oHostbasedKeyTypes },
+ { "pubkeyacceptedkeytypes", oPubkeyAcceptedKeyTypes },
+ { "ignoreunknown", oIgnoreUnknown },
+ { "proxyjump", oProxyJump },
+ { "securitykeyprovider", oSecurityKeyProvider },
+
+ { NULL, oBadOption }
+};
+
+static char *kex_default_pk_alg_filtered;
+
+const char *
+kex_default_pk_alg(void)
+{
+ if (kex_default_pk_alg_filtered == NULL)
+ fatal("kex_default_pk_alg not initialized.");
+ return kex_default_pk_alg_filtered;
+}
+
+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("%s: mux digest failed", __func__);
+ 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("%s: ignoring duplicate key %s", __func__, 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("%s: ignoring duplicate key %s", __func__, 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 devnull, 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));
+ }
+
+ /* Need this to redirect subprocess stdin/out */
+ if ((devnull = open(_PATH_DEVNULL, O_RDWR)) == -1)
+ fatal("open(/dev/null): %s", strerror(errno));
+
+ debug("Executing command: '%.500s'", cmd);
+
+ /* Fork and execute the command. */
+ if ((pid = fork()) == 0) {
+ char *argv[4];
+
+ /* Redirect child stdin and stdout. Leave stderr */
+ if (dup2(devnull, STDIN_FILENO) == -1)
+ fatal("dup2: %s", strerror(errno));
+ if (dup2(devnull, STDOUT_FILENO) == -1)
+ fatal("dup2: %s", strerror(errno));
+ if (devnull > STDERR_FILENO)
+ close(devnull);
+ 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("%s: fork: %.100s", __func__, strerror(errno));
+
+ close(devnull);
+
+ while (waitpid(pid, &status, 0) == -1) {
+ if (errno != EINTR && errno != EAGAIN)
+ fatal("%s: waitpid: %s", __func__, 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') {
+ criteria = NULL;
+ this_result = 1;
+ if ((negate = attrib[0] == '!'))
+ attrib++;
+ /* criteria "all" and "canonical" have no argument */
+ if (strcasecmp(attrib, "all") == 0) {
+ if (attributes > 1 ||
+ ((arg = strdelim(&cp)) != NULL && *arg != '\0')) {
+ error("%.200s line %d: '%s' cannot be combined "
+ "with other Match attributes",
+ filename, linenum, oattrib);
+ result = -1;
+ goto out;
+ }
+ if (result)
+ result = negate ? 0 : 1;
+ goto out;
+ }
+ attributes++;
+ 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') {
+ 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)
+{
+ int i, j, onum_send_env = options->num_send_env;
+ char *cp;
+
+ /* Remove an environment variable */
+ for (i = 0; i < options->num_send_env; ) {
+ cp = xstrdup(options->send_env[i]);
+ if (!match_pattern(cp, arg + 1)) {
+ free(cp);
+ i++;
+ continue;
+ }
+ debug3("%s line %d: removing environment %s",
+ filename, linenum, cp);
+ free(cp);
+ 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_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_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')
+ fatal("%s line %d: missing argument.", filename, linenum);
+ 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 *s, **charptr, *endofnumber, *keyword, *arg, *arg2;
+ char **cpptr, fwdarg[256];
+ u_int i, *uintptr, 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;
+
+ 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';
+ }
+
+ s = line;
+ /* Get the keyword. (Each line is supposed to begin with a keyword). */
+ if ((keyword = strdelim(&s)) == NULL)
+ return 0;
+ /* Ignore leading whitespace. */
+ if (*keyword == '\0')
+ keyword = strdelim(&s);
+ if (keyword == NULL || !*keyword || *keyword == '\n' || *keyword == '#')
+ return 0;
+ /* Match lowercase keyword */
+ lowercase(keyword);
+
+ opcode = parse_token(keyword, filename, linenum,
+ options->ignored_unknown);
+
+ switch (opcode) {
+ case oBadOption:
+ /* don't panic, but count bad options */
+ return -1;
+ case oIgnore:
+ return 0;
+ case oIgnoredUnknownOption:
+ debug("%s line %d: Ignored unknown option \"%s\"",
+ filename, linenum, keyword);
+ return 0;
+ case oConnectTimeout:
+ intptr = &options->connection_timeout;
+parse_time:
+ arg = strdelim(&s);
+ if (!arg || *arg == '\0')
+ fatal("%s line %d: missing time value.",
+ filename, linenum);
+ if (strcmp(arg, "none") == 0)
+ value = -1;
+ else if ((value = convtime(arg)) == -1)
+ fatal("%s line %d: invalid time value.",
+ filename, linenum);
+ if (*activep && *intptr == -1)
+ *intptr = value;
+ break;
+
+ case oForwardAgent:
+ intptr = &options->forward_agent;
+
+ arg = strdelim(&s);
+ if (!arg || *arg == '\0')
+ fatal("%s line %d: missing argument.",
+ filename, linenum);
+
+ 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 = strdelim(&s);
+ if ((value = parse_multistate_value(arg, filename, linenum,
+ multistate_ptr)) == -1) {
+ fatal("%s line %d: unsupported option \"%s\".",
+ filename, linenum, arg);
+ }
+ 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:
+ intptr = &options->pubkey_authentication;
+ goto parse_flag;
+
+ case oHostbasedAuthentication:
+ intptr = &options->hostbased_authentication;
+ goto parse_flag;
+
+ case oChallengeResponseAuthentication:
+ intptr = &options->challenge_response_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 = strdelim(&s);
+ if (!arg || *arg == '\0')
+ fatal("%.200s line %d: Missing argument.", filename,
+ linenum);
+ if (strcmp(arg, "default") == 0) {
+ val64 = 0;
+ } else {
+ if (scan_scaled(arg, &val64) == -1)
+ fatal("%.200s line %d: Bad number '%s': %s",
+ filename, linenum, arg, strerror(errno));
+ if (val64 != 0 && val64 < 16)
+ fatal("%.200s line %d: RekeyLimit too small",
+ filename, linenum);
+ }
+ if (*activep && options->rekey_limit == -1)
+ options->rekey_limit = val64;
+ if (s != NULL) { /* optional rekey interval present */
+ if (strcmp(s, "none") == 0) {
+ (void)strdelim(&s); /* discard */
+ break;
+ }
+ intptr = &options->rekey_interval;
+ goto parse_time;
+ }
+ break;
+
+ case oIdentityFile:
+ arg = strdelim(&s);
+ if (!arg || *arg == '\0')
+ fatal("%.200s line %d: Missing argument.", filename, linenum);
+ if (*activep) {
+ intptr = &options->num_identity_files;
+ if (*intptr >= SSH_MAX_IDENTITY_FILES)
+ fatal("%.200s line %d: Too many identity files specified (max %d).",
+ filename, linenum, SSH_MAX_IDENTITY_FILES);
+ add_identity_file(options, NULL,
+ arg, flags & SSHCONF_USERCONF);
+ }
+ break;
+
+ case oCertificateFile:
+ arg = strdelim(&s);
+ if (!arg || *arg == '\0')
+ fatal("%.200s line %d: Missing argument.",
+ filename, linenum);
+ if (*activep) {
+ intptr = &options->num_certificate_files;
+ if (*intptr >= SSH_MAX_CERTIFICATE_FILES) {
+ fatal("%.200s line %d: Too many certificate "
+ "files specified (max %d).",
+ filename, linenum,
+ SSH_MAX_CERTIFICATE_FILES);
+ }
+ 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 = strdelim(&s);
+ if (!arg || *arg == '\0')
+ fatal("%.200s line %d: Missing argument.",
+ filename, linenum);
+ 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:
+ if (*activep && *uintptr == 0) {
+ while ((arg = strdelim(&s)) != NULL && *arg != '\0') {
+ if ((*uintptr) >= max_entries)
+ fatal("%s line %d: "
+ "too many known hosts files.",
+ filename, linenum);
+ cpptr[(*uintptr)++] = xstrdup(arg);
+ }
+ }
+ return 0;
+
+ 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 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 (s == NULL)
+ fatal("%.200s line %d: Missing argument.", filename, linenum);
+ len = strspn(s, WHITESPACE "=");
+ if (*activep && *charptr == NULL)
+ *charptr = xstrdup(s + len);
+ return 0;
+
+ case oProxyJump:
+ if (s == NULL) {
+ fatal("%.200s line %d: Missing argument.",
+ filename, linenum);
+ }
+ len = strspn(s, WHITESPACE "=");
+ if (parse_jump(s + len, options, *activep) == -1) {
+ fatal("%.200s line %d: Invalid ProxyJump \"%s\"",
+ filename, linenum, s + len);
+ }
+ return 0;
+
+ case oPort:
+ arg = strdelim(&s);
+ if (!arg || *arg == '\0')
+ fatal("%.200s line %d: Missing argument.",
+ filename, linenum);
+ value = a2port(arg);
+ if (value <= 0)
+ fatal("%.200s line %d: Bad port '%s'.",
+ filename, linenum, arg);
+ if (*activep && options->port == -1)
+ options->port = value;
+ break;
+
+ case oConnectionAttempts:
+ intptr = &options->connection_attempts;
+parse_int:
+ arg = strdelim(&s);
+ if ((errstr = atoi_err(arg, &value)) != NULL)
+ fatal("%s line %d: integer value %s.",
+ filename, linenum, errstr);
+ if (*activep && *intptr == -1)
+ *intptr = value;
+ break;
+
+ case oCiphers:
+ arg = strdelim(&s);
+ if (!arg || *arg == '\0')
+ fatal("%.200s line %d: Missing argument.", filename, linenum);
+ if (*arg != '-' &&
+ !ciphers_valid(*arg == '+' || *arg == '^' ? arg + 1 : arg))
+ fatal("%.200s line %d: Bad SSH2 cipher spec '%s'.",
+ filename, linenum, arg ? arg : "<NONE>");
+ if (*activep && options->ciphers == NULL)
+ options->ciphers = xstrdup(arg);
+ break;
+
+ case oMacs:
+ arg = strdelim(&s);
+ if (!arg || *arg == '\0')
+ fatal("%.200s line %d: Missing argument.", filename, linenum);
+ if (*arg != '-' &&
+ !mac_valid(*arg == '+' || *arg == '^' ? arg + 1 : arg))
+ fatal("%.200s line %d: Bad SSH2 MAC spec '%s'.",
+ filename, linenum, arg ? arg : "<NONE>");
+ if (*activep && options->macs == NULL)
+ options->macs = xstrdup(arg);
+ break;
+
+ case oKexAlgorithms:
+ arg = strdelim(&s);
+ if (!arg || *arg == '\0')
+ fatal("%.200s line %d: Missing argument.",
+ filename, linenum);
+ if (*arg != '-' &&
+ !kex_names_valid(*arg == '+' || *arg == '^' ?
+ arg + 1 : arg))
+ fatal("%.200s line %d: Bad SSH2 KexAlgorithms '%s'.",
+ filename, linenum, arg ? arg : "<NONE>");
+ if (*activep && options->kex_algorithms == NULL)
+ options->kex_algorithms = xstrdup(arg);
+ break;
+
+ case oHostKeyAlgorithms:
+ charptr = &options->hostkeyalgorithms;
+parse_keytypes:
+ arg = strdelim(&s);
+ if (!arg || *arg == '\0')
+ fatal("%.200s line %d: Missing argument.",
+ filename, linenum);
+ if (*arg != '-' &&
+ !sshkey_names_valid2(*arg == '+' || *arg == '^' ?
+ arg + 1 : arg, 1))
+ fatal("%s line %d: Bad key types '%s'.",
+ filename, linenum, arg ? arg : "<NONE>");
+ if (*activep && *charptr == NULL)
+ *charptr = xstrdup(arg);
+ break;
+
+ case oCASignatureAlgorithms:
+ charptr = &options->ca_sign_algorithms;
+ goto parse_keytypes;
+
+ case oLogLevel:
+ log_level_ptr = &options->log_level;
+ arg = strdelim(&s);
+ value = log_level_number(arg);
+ if (value == SYSLOG_LEVEL_NOT_SET)
+ fatal("%.200s line %d: unsupported log level '%s'",
+ filename, linenum, arg ? arg : "<NONE>");
+ if (*activep && *log_level_ptr == SYSLOG_LEVEL_NOT_SET)
+ *log_level_ptr = (LogLevel) value;
+ break;
+
+ case oLogFacility:
+ log_facility_ptr = &options->log_facility;
+ arg = strdelim(&s);
+ value = log_facility_number(arg);
+ if (value == SYSLOG_FACILITY_NOT_SET)
+ fatal("%.200s line %d: unsupported log facility '%s'",
+ filename, linenum, arg ? arg : "<NONE>");
+ if (*log_facility_ptr == -1)
+ *log_facility_ptr = (SyslogFacility) value;
+ break;
+
+ case oLocalForward:
+ case oRemoteForward:
+ case oDynamicForward:
+ arg = strdelim(&s);
+ if (arg == NULL || *arg == '\0')
+ fatal("%.200s line %d: Missing port argument.",
+ filename, linenum);
+
+ remotefwd = (opcode == oRemoteForward);
+ dynamicfwd = (opcode == oDynamicForward);
+
+ if (!dynamicfwd) {
+ arg2 = strdelim(&s);
+ if (arg2 == NULL || *arg2 == '\0') {
+ if (remotefwd)
+ dynamicfwd = 1;
+ else
+ fatal("%.200s line %d: Missing target "
+ "argument.", filename, linenum);
+ } 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)
+ fatal("%.200s line %d: Bad forwarding specification.",
+ filename, linenum);
+
+ if (*activep) {
+ if (remotefwd) {
+ add_remote_forward(options, &fwd);
+ } else {
+ add_local_forward(options, &fwd);
+ }
+ }
+ break;
+
+ case oClearAllForwardings:
+ intptr = &options->clear_forwardings;
+ goto parse_flag;
+
+ case oHost:
+ if (cmdline)
+ fatal("Host directive not supported as a command-line "
+ "option");
+ *activep = 0;
+ arg2 = NULL;
+ while ((arg = strdelim(&s)) != NULL && *arg != '\0') {
+ if ((flags & SSHCONF_NEVERMATCH) != 0)
+ 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;
+ break;
+ }
+ if (!*activep)
+ arg2 = arg; /* logged below */
+ *activep = 1;
+ }
+ }
+ if (*activep)
+ debug("%.200s line %d: Applying options for %.100s",
+ filename, linenum, arg2);
+ /* Avoid garbage check below, as strdelim is done. */
+ return 0;
+
+ case oMatch:
+ if (cmdline)
+ fatal("Host directive not supported as a command-line "
+ "option");
+ value = match_cfg_line(options, &s, pw, host, original_host,
+ flags & SSHCONF_FINAL, want_final_pass,
+ filename, linenum);
+ if (value < 0)
+ fatal("%.200s line %d: Bad Match condition", filename,
+ linenum);
+ *activep = (flags & SSHCONF_NEVERMATCH) ? 0 : value;
+ break;
+
+ case oEscapeChar:
+ intptr = &options->escape_char;
+ arg = strdelim(&s);
+ if (!arg || *arg == '\0')
+ fatal("%.200s line %d: Missing argument.", filename, linenum);
+ 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 {
+ fatal("%.200s line %d: Bad escape character.",
+ filename, linenum);
+ /* NOTREACHED */
+ value = 0; /* Avoid compiler warning. */
+ }
+ 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 = strdelim(&s)) != NULL && *arg != '\0') {
+ if (strchr(arg, '=') != NULL)
+ fatal("%s line %d: Invalid environment name.",
+ filename, linenum);
+ if (!*activep)
+ continue;
+ if (*arg == '-') {
+ /* Removing an env var */
+ rm_env(options, arg, filename, linenum);
+ continue;
+ } else {
+ /* Adding an env var */
+ if (options->num_send_env >= INT_MAX)
+ fatal("%s line %d: too many send env.",
+ filename, linenum);
+ options->send_env = xrecallocarray(
+ options->send_env, options->num_send_env,
+ options->num_send_env + 1,
+ sizeof(*options->send_env));
+ options->send_env[options->num_send_env++] =
+ xstrdup(arg);
+ }
+ }
+ break;
+
+ case oSetEnv:
+ value = options->num_setenv;
+ while ((arg = strdelimw(&s)) != NULL && *arg != '\0') {
+ if (strchr(arg, '=') == NULL)
+ fatal("%s line %d: Invalid SetEnv.",
+ filename, linenum);
+ if (!*activep || value != 0)
+ continue;
+ /* Adding a setenv var */
+ if (options->num_setenv >= INT_MAX)
+ fatal("%s line %d: too many SetEnv.",
+ filename, linenum);
+ options->setenv = xrecallocarray(
+ options->setenv, options->num_setenv,
+ options->num_setenv + 1, sizeof(*options->setenv));
+ options->setenv[options->num_setenv++] = xstrdup(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 = strdelim(&s);
+ if (!arg || *arg == '\0')
+ fatal("%.200s line %d: Missing ControlPersist"
+ " argument.", filename, linenum);
+ 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
+ fatal("%.200s line %d: Bad ControlPersist argument.",
+ filename, linenum);
+ 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 = strdelim(&s);
+ if (!arg || *arg == '\0')
+ fatal("%.200s line %d: Missing argument.", filename, linenum);
+ value = a2tun(arg, &value2);
+ if (value == SSH_TUNID_ERR)
+ fatal("%.200s line %d: Bad tun device.", filename, linenum);
+ if (*activep) {
+ 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)
+ fatal("Include directive not supported as a "
+ "command-line option");
+ value = 0;
+ while ((arg = strdelim(&s)) != NULL && *arg != '\0') {
+ /*
+ * 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)
+ fatal("%.200s line %d: bad include path %s.",
+ filename, linenum, arg);
+ 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)
+ fatal("%.200s line %d: glob failed for %s.",
+ filename, linenum, arg2);
+ 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) {
+ fatal("Can't open user config file "
+ "%.100s: %.100s", gl.gl_pathv[i],
+ strerror(errno));
+ }
+ /*
+ * 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)
+ return value;
+ break;
+
+ case oIPQoS:
+ arg = strdelim(&s);
+ if ((value = parse_ipqos(arg)) == -1)
+ fatal("%s line %d: Bad IPQoS value: %s",
+ filename, linenum, arg);
+ arg = strdelim(&s);
+ if (arg == NULL)
+ value2 = value;
+ else if ((value2 = parse_ipqos(arg)) == -1)
+ fatal("%s line %d: Bad IPQoS value: %s",
+ filename, linenum, arg);
+ if (*activep) {
+ options->ip_qos_interactive = value;
+ options->ip_qos_bulk = value2;
+ }
+ break;
+
+ case oRequestTTY:
+ intptr = &options->request_tty;
+ multistate_ptr = multistate_requesttty;
+ goto parse_multistate;
+
+ 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;
+ while ((arg = strdelim(&s)) != NULL && *arg != '\0') {
+ if (!valid_domain(arg, 1, &errstr)) {
+ fatal("%s line %d: %s", filename, linenum,
+ errstr);
+ }
+ if (!*activep || value)
+ continue;
+ if (options->num_canonical_domains >= MAX_CANON_DOMAINS)
+ fatal("%s line %d: too many hostname suffixes.",
+ filename, linenum);
+ options->canonical_domains[
+ options->num_canonical_domains++] = xstrdup(arg);
+ }
+ break;
+
+ case oCanonicalizePermittedCNAMEs:
+ value = options->num_permitted_cnames != 0;
+ while ((arg = strdelim(&s)) != NULL && *arg != '\0') {
+ /* Either '*' for everything or 'list:list' */
+ if (strcmp(arg, "*") == 0)
+ arg2 = arg;
+ else {
+ lowercase(arg);
+ if ((arg2 = strchr(arg, ':')) == NULL ||
+ arg2[1] == '\0') {
+ fatal("%s line %d: "
+ "Invalid permitted CNAME \"%s\"",
+ filename, linenum, arg);
+ }
+ *arg2 = '\0';
+ arg2++;
+ }
+ if (!*activep || value)
+ continue;
+ if (options->num_permitted_cnames >= MAX_CANON_DOMAINS)
+ fatal("%s line %d: too many permitted CNAMEs.",
+ filename, linenum);
+ 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 = strdelim(&s);
+ if (!arg || *arg == '\0')
+ fatal("%.200s line %d: Missing StreamLocalBindMask argument.", filename, linenum);
+ /* Parse mode in octal format */
+ value = strtol(arg, &endofnumber, 8);
+ if (arg == endofnumber || value < 0 || value > 0777)
+ fatal("%.200s line %d: Bad mask.", filename, linenum);
+ 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 = strdelim(&s);
+ if (!arg || *arg == '\0')
+ fatal("%.200s line %d: Missing argument.",
+ filename, linenum);
+ if ((value = ssh_digest_alg_by_name(arg)) == -1)
+ fatal("%.200s line %d: Invalid hash algorithm \"%s\".",
+ filename, linenum, arg);
+ if (*activep && *intptr == -1)
+ *intptr = value;
+ break;
+
+ case oUpdateHostkeys:
+ intptr = &options->update_hostkeys;
+ multistate_ptr = multistate_yesnoask;
+ goto parse_multistate;
+
+ case oHostbasedKeyTypes:
+ charptr = &options->hostbased_key_types;
+ goto parse_keytypes;
+
+ case oPubkeyAcceptedKeyTypes:
+ charptr = &options->pubkey_key_types;
+ goto parse_keytypes;
+
+ case oAddKeysToAgent:
+ arg = strdelim(&s);
+ arg2 = strdelim(&s);
+ 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)
+ fatal("%s line %d: invalid time value.",
+ filename, linenum);
+ } else if (value == -1 && arg2 == NULL) {
+ if ((value2 = convtime(arg)) == -1 || value2 > INT_MAX)
+ fatal("%s line %d: unsupported option",
+ filename, linenum);
+ value = 1; /* yes */
+ } else if (value == -1 || arg2 != NULL) {
+ fatal("%s line %d: unsupported option",
+ filename, linenum);
+ }
+ 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 = strdelim(&s);
+ if (!arg || *arg == '\0')
+ fatal("%.200s line %d: Missing argument.",
+ filename, linenum);
+ parse_agent_path:
+ /* Extra validation if the string represents an env var. */
+ if ((arg2 = dollar_expand(&r, arg)) == NULL || r)
+ fatal("%.200s line %d: Invalid environment expansion "
+ "%s.", filename, linenum, arg);
+ free(arg2);
+ /* check for legacy environment format */
+ if (arg[0] == '$' && arg[1] != '{' && !valid_env_name(arg + 1)) {
+ fatal("%.200s line %d: Invalid environment name %s.",
+ filename, linenum, arg);
+ }
+ if (*activep && *charptr == NULL)
+ *charptr = xstrdup(arg);
+ break;
+
+ case oDeprecated:
+ debug("%s line %d: Deprecated option \"%s\"",
+ filename, linenum, keyword);
+ return 0;
+
+ case oUnsupported:
+ error("%s line %d: Unsupported option \"%s\"",
+ filename, linenum, keyword);
+ return 0;
+
+ default:
+ fatal("%s: Unimplemented opcode %d", __func__, opcode);
+ }
+
+ /* Check that there is no garbage at end of line. */
+ if ((arg = strdelim(&s)) != NULL && *arg != '\0') {
+ fatal("%.200s line %d: garbage at end of line; \"%.200s\".",
+ filename, linenum, arg);
+ }
+ return 0;
+}
+
+/*
+ * 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++;
+ 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;
+}
+
+/*
+ * 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->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->challenge_response_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;
+ options->num_certificate_files = 0;
+ 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->log_facility = SYSLOG_FACILITY_NOT_SET;
+ options->log_level = SYSLOG_LEVEL_NOT_SET;
+ 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->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_key_types = NULL;
+ options->pubkey_key_types = NULL;
+}
+
+/*
+ * A petite version of fill_default_options() that just fills the options
+ * needed for hostname canonicalization to proceed.
+ */
+void
+fill_default_options_for_canonicalization(Options *options)
+{
+ if (options->canonicalize_max_dots == -1)
+ options->canonicalize_max_dots = 1;
+ if (options->canonicalize_fallback_local == -1)
+ options->canonicalize_fallback_local = 1;
+ if (options->canonicalize_hostname == -1)
+ options->canonicalize_hostname = SSH_CANONICALISE_NO;
+}
+
+/*
+ * Called after processing other sources of option data, this fills those
+ * options for which no value has been specified with their default values.
+ */
+void
+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 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 = _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 = 1;
+ if (options->challenge_response_authentication == -1)
+ options->challenge_response_authentication = 1;
+ 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 = 1;
+ 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);
+ add_identity_file(options, "~/", _PATH_SSH_CLIENT_ID_DSA, 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);
+ }
+ 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)
+ 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->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
+
+ /* 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) \
+ fatal("%s: %s: %s", __func__, #what, ssh_err(r)); \
+ } while (0)
+ ASSEMBLE(ciphers, def_cipher, all_cipher);
+ ASSEMBLE(macs, def_mac, all_mac);
+ ASSEMBLE(kex_algorithms, def_kex, all_kex);
+ ASSEMBLE(hostbased_key_types, def_key, all_key);
+ ASSEMBLE(pubkey_key_types, def_key, all_key);
+ ASSEMBLE(ca_sign_algorithms, def_sig, all_sig);
+#undef ASSEMBLE
+ free(all_cipher);
+ free(all_mac);
+ free(all_kex);
+ free(all_key);
+ free(all_sig);
+ free(def_cipher);
+ free(def_mac);
+ free(def_kex);
+ kex_default_pk_alg_filtered = def_key; /* save for later use */
+ free(def_sig);
+
+#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);
+ 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;
+ }
+ /* 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 */
+}
+
+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 ret = -1, port = -1, first;
+
+ active &= o->proxy_command == NULL && o->jump_host == NULL;
+
+ orig = sdup = xstrdup(s);
+ 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 */
+ if (parse_ssh_uri(cp, &user, &host, &port) == -1 ||
+ parse_user_host_port(cp, &user, &host, &port) != 0)
+ goto out;
+ } else {
+ /* Subsequent argument or inactive configuration */
+ if (parse_ssh_uri(cp, NULL, NULL, NULL) == -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 *path;
+ int r;
+
+ r = parse_uri("ssh", uri, userp, hostp, portp, &path);
+ if (r == 0 && path != NULL)
+ r = -1; /* path not allowed */
+ 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 oCanonicalizeHostname:
+ return fmt_multistate_int(val, multistate_canonicalizehostname);
+ case oAddKeysToAgent:
+ return fmt_multistate_int(val, multistate_yesnoaskconfirm);
+ 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));
+ 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("%s: expand HostKeyAlgorithms: %s", __func__, ssh_err(r));
+ free(all_key);
+
+ /* Most interesting options first: user, host, port */
+ 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(oChallengeResponseAuthentication, o->challenge_response_authentication);
+ 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(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);
+
+ /* 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);
+
+ /* 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(oHostbasedKeyTypes, o->hostbased_key_types);
+ 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(oPubkeyAcceptedKeyTypes, o->pubkey_key_types);
+ dump_cfg_string(oRevokedHostKeys, o->revoked_host_keys);
+ dump_cfg_string(oXAuthLocation, o->xauth_location);
+
+ /* 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);
+
+ /* Special cases */
+
+ /* 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 */
+ if ( o->num_permitted_cnames > 0) {
+ printf("canonicalizePermittedcnames");
+ 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);
+ }
+}