1987 lines
56 KiB
C
1987 lines
56 KiB
C
/* $OpenBSD: readconf.c,v 1.218 2014/02/23 20:11:36 djm Exp $ */
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/* $FreeBSD$ */
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/*
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* Author: Tatu Ylonen <ylo@cs.hut.fi>
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* Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
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* All rights reserved
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* Functions for reading the configuration files.
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*
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* As far as I am concerned, the code I have written for this software
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* can be used freely for any purpose. Any derived versions of this
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* software must be clearly marked as such, and if the derived work is
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* incompatible with the protocol description in the RFC file, it must be
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* called by a name other than "ssh" or "Secure Shell".
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*/
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#include "includes.h"
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__RCSID("$FreeBSD$");
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <sys/socket.h>
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#include <sys/sysctl.h>
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#include <sys/wait.h>
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#include <netinet/in.h>
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#include <netinet/in_systm.h>
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#include <netinet/ip.h>
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#include <arpa/inet.h>
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#include <ctype.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <netdb.h>
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#ifdef HAVE_PATHS_H
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# include <paths.h>
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#endif
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#include <pwd.h>
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#include <signal.h>
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#include <stdarg.h>
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#include <stdio.h>
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#include <string.h>
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#include <unistd.h>
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#ifdef HAVE_UTIL_H
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#include <util.h>
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#endif
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#include "xmalloc.h"
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#include "ssh.h"
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#include "compat.h"
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#include "cipher.h"
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#include "pathnames.h"
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#include "log.h"
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#include "key.h"
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#include "readconf.h"
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#include "match.h"
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#include "misc.h"
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#include "buffer.h"
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#include "kex.h"
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#include "mac.h"
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#include "uidswap.h"
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#include "version.h"
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/* Format of the configuration file:
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# Configuration data is parsed as follows:
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# 1. command line options
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# 2. user-specific file
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# 3. system-wide file
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# Any configuration value is only changed the first time it is set.
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# Thus, host-specific definitions should be at the beginning of the
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# configuration file, and defaults at the end.
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# Host-specific declarations. These may override anything above. A single
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# host may match multiple declarations; these are processed in the order
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# that they are given in.
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Host *.ngs.fi ngs.fi
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User foo
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Host fake.com
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HostName another.host.name.real.org
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User blaah
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Port 34289
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ForwardX11 no
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ForwardAgent no
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Host books.com
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RemoteForward 9999 shadows.cs.hut.fi:9999
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Cipher 3des
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Host fascist.blob.com
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Port 23123
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User tylonen
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PasswordAuthentication no
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Host puukko.hut.fi
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User t35124p
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ProxyCommand ssh-proxy %h %p
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Host *.fr
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PublicKeyAuthentication no
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Host *.su
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Cipher none
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PasswordAuthentication no
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Host vpn.fake.com
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Tunnel yes
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TunnelDevice 3
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# Defaults for various options
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Host *
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ForwardAgent no
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ForwardX11 no
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PasswordAuthentication yes
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RSAAuthentication yes
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RhostsRSAAuthentication yes
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StrictHostKeyChecking yes
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TcpKeepAlive no
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IdentityFile ~/.ssh/identity
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Port 22
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EscapeChar ~
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*/
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/* Keyword tokens. */
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typedef enum {
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oBadOption,
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oHost, oMatch,
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oForwardAgent, oForwardX11, oForwardX11Trusted, oForwardX11Timeout,
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oGatewayPorts, oExitOnForwardFailure,
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oPasswordAuthentication, oRSAAuthentication,
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oChallengeResponseAuthentication, oXAuthLocation,
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oIdentityFile, oHostName, oPort, oCipher, oRemoteForward, oLocalForward,
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oUser, oEscapeChar, oRhostsRSAAuthentication, oProxyCommand,
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oGlobalKnownHostsFile, oUserKnownHostsFile, oConnectionAttempts,
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oBatchMode, oCheckHostIP, oStrictHostKeyChecking, oCompression,
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oCompressionLevel, oTCPKeepAlive, oNumberOfPasswordPrompts,
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oUsePrivilegedPort, oLogLevel, oCiphers, oProtocol, oMacs,
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oGlobalKnownHostsFile2, oUserKnownHostsFile2, oPubkeyAuthentication,
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oKbdInteractiveAuthentication, oKbdInteractiveDevices, oHostKeyAlias,
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oDynamicForward, oPreferredAuthentications, oHostbasedAuthentication,
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oHostKeyAlgorithms, oBindAddress, oPKCS11Provider,
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oClearAllForwardings, oNoHostAuthenticationForLocalhost,
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oEnableSSHKeysign, oRekeyLimit, oVerifyHostKeyDNS, oConnectTimeout,
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oAddressFamily, oGssAuthentication, oGssDelegateCreds,
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oServerAliveInterval, oServerAliveCountMax, oIdentitiesOnly,
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oSendEnv, oControlPath, oControlMaster, oControlPersist,
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oHashKnownHosts,
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oTunnel, oTunnelDevice, oLocalCommand, oPermitLocalCommand,
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oVisualHostKey, oUseRoaming,
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oKexAlgorithms, oIPQoS, oRequestTTY, oIgnoreUnknown, oProxyUseFdpass,
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oCanonicalDomains, oCanonicalizeHostname, oCanonicalizeMaxDots,
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oCanonicalizeFallbackLocal, oCanonicalizePermittedCNAMEs,
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oIgnoredUnknownOption,
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oHPNDisabled, oHPNBufferSize, oTcpRcvBufPoll, oTcpRcvBuf,
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#ifdef NONE_CIPHER_ENABLED
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oNoneEnabled, oNoneSwitch,
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#endif
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oVersionAddendum, oDeprecated, oUnsupported
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} OpCodes;
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/* Textual representations of the tokens. */
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static struct {
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const char *name;
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OpCodes opcode;
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} keywords[] = {
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{ "forwardagent", oForwardAgent },
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{ "forwardx11", oForwardX11 },
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{ "forwardx11trusted", oForwardX11Trusted },
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{ "forwardx11timeout", oForwardX11Timeout },
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{ "exitonforwardfailure", oExitOnForwardFailure },
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{ "xauthlocation", oXAuthLocation },
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{ "gatewayports", oGatewayPorts },
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{ "useprivilegedport", oUsePrivilegedPort },
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{ "rhostsauthentication", oDeprecated },
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{ "passwordauthentication", oPasswordAuthentication },
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{ "kbdinteractiveauthentication", oKbdInteractiveAuthentication },
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{ "kbdinteractivedevices", oKbdInteractiveDevices },
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{ "rsaauthentication", oRSAAuthentication },
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{ "pubkeyauthentication", oPubkeyAuthentication },
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{ "dsaauthentication", oPubkeyAuthentication }, /* alias */
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{ "rhostsrsaauthentication", oRhostsRSAAuthentication },
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{ "hostbasedauthentication", oHostbasedAuthentication },
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{ "challengeresponseauthentication", oChallengeResponseAuthentication },
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{ "skeyauthentication", oChallengeResponseAuthentication }, /* alias */
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{ "tisauthentication", oChallengeResponseAuthentication }, /* alias */
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{ "kerberosauthentication", oUnsupported },
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{ "kerberostgtpassing", oUnsupported },
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{ "afstokenpassing", oUnsupported },
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#if defined(GSSAPI)
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{ "gssapiauthentication", oGssAuthentication },
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{ "gssapidelegatecredentials", oGssDelegateCreds },
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#else
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{ "gssapiauthentication", oUnsupported },
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{ "gssapidelegatecredentials", oUnsupported },
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#endif
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{ "fallbacktorsh", oDeprecated },
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{ "usersh", oDeprecated },
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{ "identityfile", oIdentityFile },
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{ "identityfile2", oIdentityFile }, /* obsolete */
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{ "identitiesonly", oIdentitiesOnly },
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{ "hostname", oHostName },
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{ "hostkeyalias", oHostKeyAlias },
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{ "proxycommand", oProxyCommand },
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{ "port", oPort },
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{ "cipher", oCipher },
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{ "ciphers", oCiphers },
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{ "macs", oMacs },
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{ "protocol", oProtocol },
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{ "remoteforward", oRemoteForward },
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{ "localforward", oLocalForward },
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{ "user", oUser },
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{ "host", oHost },
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{ "match", oMatch },
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{ "escapechar", oEscapeChar },
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{ "globalknownhostsfile", oGlobalKnownHostsFile },
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{ "globalknownhostsfile2", oDeprecated },
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{ "userknownhostsfile", oUserKnownHostsFile },
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{ "userknownhostsfile2", oDeprecated },
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{ "connectionattempts", oConnectionAttempts },
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{ "batchmode", oBatchMode },
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{ "checkhostip", oCheckHostIP },
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{ "stricthostkeychecking", oStrictHostKeyChecking },
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{ "compression", oCompression },
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{ "compressionlevel", oCompressionLevel },
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{ "tcpkeepalive", oTCPKeepAlive },
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{ "keepalive", oTCPKeepAlive }, /* obsolete */
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{ "numberofpasswordprompts", oNumberOfPasswordPrompts },
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{ "loglevel", oLogLevel },
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{ "dynamicforward", oDynamicForward },
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{ "preferredauthentications", oPreferredAuthentications },
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{ "hostkeyalgorithms", oHostKeyAlgorithms },
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{ "bindaddress", oBindAddress },
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#ifdef ENABLE_PKCS11
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{ "smartcarddevice", oPKCS11Provider },
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{ "pkcs11provider", oPKCS11Provider },
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#else
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{ "smartcarddevice", oUnsupported },
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{ "pkcs11provider", oUnsupported },
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#endif
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{ "clearallforwardings", oClearAllForwardings },
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{ "enablesshkeysign", oEnableSSHKeysign },
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{ "verifyhostkeydns", oVerifyHostKeyDNS },
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{ "nohostauthenticationforlocalhost", oNoHostAuthenticationForLocalhost },
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{ "rekeylimit", oRekeyLimit },
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{ "connecttimeout", oConnectTimeout },
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{ "addressfamily", oAddressFamily },
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{ "serveraliveinterval", oServerAliveInterval },
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{ "serveralivecountmax", oServerAliveCountMax },
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{ "sendenv", oSendEnv },
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{ "controlpath", oControlPath },
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{ "controlmaster", oControlMaster },
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{ "controlpersist", oControlPersist },
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{ "hashknownhosts", oHashKnownHosts },
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{ "tunnel", oTunnel },
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{ "tunneldevice", oTunnelDevice },
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{ "localcommand", oLocalCommand },
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{ "permitlocalcommand", oPermitLocalCommand },
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{ "visualhostkey", oVisualHostKey },
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{ "useroaming", oUseRoaming },
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{ "kexalgorithms", oKexAlgorithms },
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{ "ipqos", oIPQoS },
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{ "requesttty", oRequestTTY },
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{ "proxyusefdpass", oProxyUseFdpass },
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{ "canonicaldomains", oCanonicalDomains },
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{ "canonicalizefallbacklocal", oCanonicalizeFallbackLocal },
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{ "canonicalizehostname", oCanonicalizeHostname },
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{ "canonicalizemaxdots", oCanonicalizeMaxDots },
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{ "canonicalizepermittedcnames", oCanonicalizePermittedCNAMEs },
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{ "ignoreunknown", oIgnoreUnknown },
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{ "hpndisabled", oHPNDisabled },
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{ "hpnbuffersize", oHPNBufferSize },
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{ "tcprcvbufpoll", oTcpRcvBufPoll },
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{ "tcprcvbuf", oTcpRcvBuf },
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#ifdef NONE_CIPHER_ENABLED
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{ "noneenabled", oNoneEnabled },
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{ "noneswitch", oNoneSwitch },
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#endif
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{ "versionaddendum", oVersionAddendum },
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{ NULL, oBadOption }
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};
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/*
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* Adds a local TCP/IP port forward to options. Never returns if there is an
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* error.
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*/
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void
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add_local_forward(Options *options, const Forward *newfwd)
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{
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Forward *fwd;
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#ifndef NO_IPPORT_RESERVED_CONCEPT
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extern uid_t original_real_uid;
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int ipport_reserved;
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#ifdef __FreeBSD__
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size_t len_ipport_reserved = sizeof(ipport_reserved);
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if (sysctlbyname("net.inet.ip.portrange.reservedhigh",
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&ipport_reserved, &len_ipport_reserved, NULL, 0) != 0)
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ipport_reserved = IPPORT_RESERVED;
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else
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ipport_reserved++;
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#else
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ipport_reserved = IPPORT_RESERVED;
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#endif
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if (newfwd->listen_port < ipport_reserved && original_real_uid != 0)
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fatal("Privileged ports can only be forwarded by root.");
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#endif
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options->local_forwards = xrealloc(options->local_forwards,
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options->num_local_forwards + 1,
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sizeof(*options->local_forwards));
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fwd = &options->local_forwards[options->num_local_forwards++];
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fwd->listen_host = newfwd->listen_host;
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fwd->listen_port = newfwd->listen_port;
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fwd->connect_host = newfwd->connect_host;
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fwd->connect_port = newfwd->connect_port;
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}
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/*
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* Adds a remote TCP/IP port forward to options. Never returns if there is
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* an error.
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*/
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void
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add_remote_forward(Options *options, const Forward *newfwd)
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{
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Forward *fwd;
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options->remote_forwards = xrealloc(options->remote_forwards,
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options->num_remote_forwards + 1,
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sizeof(*options->remote_forwards));
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fwd = &options->remote_forwards[options->num_remote_forwards++];
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fwd->listen_host = newfwd->listen_host;
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fwd->listen_port = newfwd->listen_port;
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fwd->connect_host = newfwd->connect_host;
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fwd->connect_port = newfwd->connect_port;
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fwd->handle = newfwd->handle;
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fwd->allocated_port = 0;
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}
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static void
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clear_forwardings(Options *options)
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{
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int i;
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for (i = 0; i < options->num_local_forwards; i++) {
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free(options->local_forwards[i].listen_host);
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free(options->local_forwards[i].connect_host);
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}
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if (options->num_local_forwards > 0) {
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free(options->local_forwards);
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options->local_forwards = NULL;
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}
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options->num_local_forwards = 0;
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for (i = 0; i < options->num_remote_forwards; i++) {
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free(options->remote_forwards[i].listen_host);
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free(options->remote_forwards[i].connect_host);
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}
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if (options->num_remote_forwards > 0) {
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free(options->remote_forwards);
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options->remote_forwards = NULL;
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}
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options->num_remote_forwards = 0;
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options->tun_open = SSH_TUNMODE_NO;
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}
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void
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add_identity_file(Options *options, const char *dir, const char *filename,
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int userprovided)
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{
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char *path;
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if (options->num_identity_files >= SSH_MAX_IDENTITY_FILES)
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fatal("Too many identity files specified (max %d)",
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SSH_MAX_IDENTITY_FILES);
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if (dir == NULL) /* no dir, filename is absolute */
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path = xstrdup(filename);
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else
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(void)xasprintf(&path, "%.100s%.100s", dir, filename);
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options->identity_file_userprovided[options->num_identity_files] =
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userprovided;
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options->identity_files[options->num_identity_files++] = path;
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}
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int
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default_ssh_port(void)
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{
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static int port;
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struct servent *sp;
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if (port == 0) {
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sp = getservbyname(SSH_SERVICE_NAME, "tcp");
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port = sp ? ntohs(sp->s_port) : SSH_DEFAULT_PORT;
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}
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return port;
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}
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/*
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* Execute a command in a shell.
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* Return its exit status or -1 on abnormal exit.
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*/
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static int
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execute_in_shell(const char *cmd)
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{
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char *shell, *command_string;
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pid_t pid;
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int devnull, status;
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extern uid_t original_real_uid;
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if ((shell = getenv("SHELL")) == NULL)
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shell = _PATH_BSHELL;
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/*
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* Use "exec" to avoid "sh -c" processes on some platforms
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* (e.g. Solaris)
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*/
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xasprintf(&command_string, "exec %s", cmd);
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/* Need this to redirect subprocess stdin/out */
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if ((devnull = open(_PATH_DEVNULL, O_RDWR)) == -1)
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fatal("open(/dev/null): %s", strerror(errno));
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debug("Executing command: '%.500s'", cmd);
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/* Fork and execute the command. */
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if ((pid = fork()) == 0) {
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char *argv[4];
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/* Child. Permanently give up superuser privileges. */
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permanently_drop_suid(original_real_uid);
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/* Redirect child stdin and stdout. Leave stderr */
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if (dup2(devnull, STDIN_FILENO) == -1)
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fatal("dup2: %s", strerror(errno));
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if (dup2(devnull, STDOUT_FILENO) == -1)
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fatal("dup2: %s", strerror(errno));
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if (devnull > STDERR_FILENO)
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close(devnull);
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closefrom(STDERR_FILENO + 1);
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argv[0] = shell;
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argv[1] = "-c";
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argv[2] = command_string;
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argv[3] = NULL;
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execv(argv[0], argv);
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error("Unable to execute '%.100s': %s", cmd, strerror(errno));
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/* Die with signal to make this error apparent to parent. */
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signal(SIGTERM, SIG_DFL);
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kill(getpid(), SIGTERM);
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_exit(1);
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}
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/* Parent. */
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if (pid < 0)
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fatal("%s: fork: %.100s", __func__, strerror(errno));
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close(devnull);
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free(command_string);
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while (waitpid(pid, &status, 0) == -1) {
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if (errno != EINTR && errno != EAGAIN)
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fatal("%s: waitpid: %s", __func__, strerror(errno));
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}
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if (!WIFEXITED(status)) {
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error("command '%.100s' exited abnormally", cmd);
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return -1;
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}
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debug3("command returned status %d", WEXITSTATUS(status));
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return WEXITSTATUS(status);
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}
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/*
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* Parse and execute a Match directive.
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*/
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static int
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match_cfg_line(Options *options, char **condition, struct passwd *pw,
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const char *host_arg, const char *filename, int linenum)
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{
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char *arg, *attrib, *cmd, *cp = *condition, *host;
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const char *ruser;
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int r, port, result = 1, attributes = 0;
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size_t len;
|
|
char thishost[NI_MAXHOST], shorthost[NI_MAXHOST], portstr[NI_MAXSERV];
|
|
|
|
/*
|
|
* 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 (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);
|
|
|
|
debug3("checking match for '%s' host %s", cp, host);
|
|
while ((attrib = strdelim(&cp)) && *attrib != '\0') {
|
|
attributes++;
|
|
if (strcasecmp(attrib, "all") == 0) {
|
|
if (attributes != 1 ||
|
|
((arg = strdelim(&cp)) != NULL && *arg != '\0')) {
|
|
error("'all' cannot be combined with other "
|
|
"Match attributes");
|
|
result = -1;
|
|
goto out;
|
|
}
|
|
*condition = cp;
|
|
result = 1;
|
|
goto out;
|
|
}
|
|
if ((arg = strdelim(&cp)) == NULL || *arg == '\0') {
|
|
error("Missing Match criteria for %s", attrib);
|
|
result = -1;
|
|
goto out;
|
|
}
|
|
len = strlen(arg);
|
|
if (strcasecmp(attrib, "host") == 0) {
|
|
if (match_hostname(host, arg, len) != 1)
|
|
result = 0;
|
|
else
|
|
debug("%.200s line %d: matched 'Host %.100s' ",
|
|
filename, linenum, host);
|
|
} else if (strcasecmp(attrib, "originalhost") == 0) {
|
|
if (match_hostname(host_arg, arg, len) != 1)
|
|
result = 0;
|
|
else
|
|
debug("%.200s line %d: matched "
|
|
"'OriginalHost %.100s' ",
|
|
filename, linenum, host_arg);
|
|
} else if (strcasecmp(attrib, "user") == 0) {
|
|
if (match_pattern_list(ruser, arg, len, 0) != 1)
|
|
result = 0;
|
|
else
|
|
debug("%.200s line %d: matched 'User %.100s' ",
|
|
filename, linenum, ruser);
|
|
} else if (strcasecmp(attrib, "localuser") == 0) {
|
|
if (match_pattern_list(pw->pw_name, arg, len, 0) != 1)
|
|
result = 0;
|
|
else
|
|
debug("%.200s line %d: matched "
|
|
"'LocalUser %.100s' ",
|
|
filename, linenum, pw->pw_name);
|
|
} else if (strcasecmp(attrib, "exec") == 0) {
|
|
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);
|
|
|
|
cmd = percent_expand(arg,
|
|
"L", shorthost,
|
|
"d", pw->pw_dir,
|
|
"h", host,
|
|
"l", thishost,
|
|
"n", host_arg,
|
|
"p", portstr,
|
|
"r", ruser,
|
|
"u", pw->pw_name,
|
|
(char *)NULL);
|
|
if (result != 1) {
|
|
/* skip execution if prior predicate failed */
|
|
debug("%.200s line %d: skipped exec \"%.100s\"",
|
|
filename, linenum, cmd);
|
|
} else {
|
|
r = execute_in_shell(cmd);
|
|
if (r == -1) {
|
|
fatal("%.200s line %d: match exec "
|
|
"'%.100s' error", filename,
|
|
linenum, cmd);
|
|
} else if (r == 0) {
|
|
debug("%.200s line %d: matched "
|
|
"'exec \"%.100s\"'", filename,
|
|
linenum, cmd);
|
|
} else {
|
|
debug("%.200s line %d: no match "
|
|
"'exec \"%.100s\"'", filename,
|
|
linenum, cmd);
|
|
result = 0;
|
|
}
|
|
}
|
|
free(cmd);
|
|
} else {
|
|
error("Unsupported Match attribute %s", attrib);
|
|
result = -1;
|
|
goto out;
|
|
}
|
|
}
|
|
if (attributes == 0) {
|
|
error("One or more attributes required for Match");
|
|
result = -1;
|
|
goto out;
|
|
}
|
|
debug3("match %sfound", result ? "" : "not ");
|
|
*condition = cp;
|
|
out:
|
|
free(host);
|
|
return result;
|
|
}
|
|
|
|
/* Check and prepare a domain name: removes trailing '.' and lowercases */
|
|
static void
|
|
valid_domain(char *name, const char *filename, int linenum)
|
|
{
|
|
size_t i, l = strlen(name);
|
|
u_char c, last = '\0';
|
|
|
|
if (l == 0)
|
|
fatal("%s line %d: empty hostname suffix", filename, linenum);
|
|
if (!isalpha((u_char)name[0]) && !isdigit((u_char)name[0]))
|
|
fatal("%s line %d: hostname suffix \"%.100s\" "
|
|
"starts with invalid character", filename, linenum, name);
|
|
for (i = 0; i < l; i++) {
|
|
c = tolower((u_char)name[i]);
|
|
name[i] = (char)c;
|
|
if (last == '.' && c == '.')
|
|
fatal("%s line %d: hostname suffix \"%.100s\" contains "
|
|
"consecutive separators", filename, linenum, name);
|
|
if (c != '.' && c != '-' && !isalnum(c) &&
|
|
c != '_') /* technically invalid, but common */
|
|
fatal("%s line %d: hostname suffix \"%.100s\" contains "
|
|
"invalid characters", filename, linenum, name);
|
|
last = c;
|
|
}
|
|
if (name[l - 1] == '.')
|
|
name[l - 1] = '\0';
|
|
}
|
|
|
|
/*
|
|
* 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,
|
|
strlen(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_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 }
|
|
};
|
|
|
|
/*
|
|
* Processes a single option line as used in the configuration files. This
|
|
* only sets those values that have not already been set.
|
|
*/
|
|
#define WHITESPACE " \t\r\n"
|
|
int
|
|
process_config_line(Options *options, struct passwd *pw, const char *host,
|
|
char *line, const char *filename, int linenum, int *activep, int userconfig)
|
|
{
|
|
char *s, **charptr, *endofnumber, *keyword, *arg, *arg2;
|
|
char **cpptr, fwdarg[256];
|
|
u_int i, *uintptr, max_entries = 0;
|
|
int negated, opcode, *intptr, value, value2, cmdline = 0;
|
|
LogLevel *log_level_ptr;
|
|
long long val64;
|
|
size_t len;
|
|
Forward fwd;
|
|
const struct multistate *multistate_ptr;
|
|
struct allowed_cname *cname;
|
|
|
|
if (activep == NULL) { /* We are processing a command line directive */
|
|
cmdline = 1;
|
|
activep = &cmdline;
|
|
}
|
|
|
|
/* Strip trailing whitespace */
|
|
for (len = strlen(line) - 1; len > 0; len--) {
|
|
if (strchr(WHITESPACE, 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;
|
|
/* NOTREACHED */
|
|
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 ((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;
|
|
parse_flag:
|
|
multistate_ptr = multistate_flag;
|
|
parse_multistate:
|
|
arg = strdelim(&s);
|
|
if (!arg || *arg == '\0')
|
|
fatal("%s line %d: missing argument.",
|
|
filename, linenum);
|
|
value = -1;
|
|
for (i = 0; multistate_ptr[i].key != NULL; i++) {
|
|
if (strcasecmp(arg, multistate_ptr[i].key) == 0) {
|
|
value = multistate_ptr[i].value;
|
|
break;
|
|
}
|
|
}
|
|
if (value == -1)
|
|
fatal("%s line %d: unsupported option \"%s\".",
|
|
filename, linenum, arg);
|
|
if (*activep && *intptr == -1)
|
|
*intptr = value;
|
|
break;
|
|
|
|
case oForwardX11:
|
|
intptr = &options->forward_x11;
|
|
goto parse_flag;
|
|
|
|
case oForwardX11Trusted:
|
|
intptr = &options->forward_x11_trusted;
|
|
goto parse_flag;
|
|
|
|
case oForwardX11Timeout:
|
|
intptr = &options->forward_x11_timeout;
|
|
goto parse_time;
|
|
|
|
case oGatewayPorts:
|
|
intptr = &options->gateway_ports;
|
|
goto parse_flag;
|
|
|
|
case oExitOnForwardFailure:
|
|
intptr = &options->exit_on_forward_failure;
|
|
goto parse_flag;
|
|
|
|
case oUsePrivilegedPort:
|
|
intptr = &options->use_privileged_port;
|
|
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 oRSAAuthentication:
|
|
intptr = &options->rsa_authentication;
|
|
goto parse_flag;
|
|
|
|
case oRhostsRSAAuthentication:
|
|
intptr = &options->rhosts_rsa_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_yesnoask;
|
|
goto parse_multistate;
|
|
|
|
case oCompression:
|
|
intptr = &options->compression;
|
|
goto parse_flag;
|
|
|
|
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 oCompressionLevel:
|
|
intptr = &options->compression_level;
|
|
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));
|
|
/* check for too-large or too-small limits */
|
|
if (val64 > UINT_MAX)
|
|
fatal("%.200s line %d: RekeyLimit too large",
|
|
filename, linenum);
|
|
if (val64 != 0 && val64 < 16)
|
|
fatal("%.200s line %d: RekeyLimit too small",
|
|
filename, linenum);
|
|
}
|
|
if (*activep && options->rekey_limit == -1)
|
|
options->rekey_limit = (u_int32_t)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, userconfig);
|
|
}
|
|
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 authorized keys 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 oPKCS11Provider:
|
|
charptr = &options->pkcs11_provider;
|
|
goto parse_string;
|
|
|
|
case oProxyCommand:
|
|
charptr = &options->proxy_command;
|
|
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 oPort:
|
|
intptr = &options->port;
|
|
parse_int:
|
|
arg = strdelim(&s);
|
|
if (!arg || *arg == '\0')
|
|
fatal("%.200s line %d: Missing argument.", filename, linenum);
|
|
if (arg[0] < '0' || arg[0] > '9')
|
|
fatal("%.200s line %d: Bad number.", filename, linenum);
|
|
|
|
/* Octal, decimal, or hex format? */
|
|
value = strtol(arg, &endofnumber, 0);
|
|
if (arg == endofnumber)
|
|
fatal("%.200s line %d: Bad number.", filename, linenum);
|
|
if (*activep && *intptr == -1)
|
|
*intptr = value;
|
|
break;
|
|
|
|
case oConnectionAttempts:
|
|
intptr = &options->connection_attempts;
|
|
goto parse_int;
|
|
|
|
case oCipher:
|
|
intptr = &options->cipher;
|
|
arg = strdelim(&s);
|
|
if (!arg || *arg == '\0')
|
|
fatal("%.200s line %d: Missing argument.", filename, linenum);
|
|
value = cipher_number(arg);
|
|
if (value == -1)
|
|
fatal("%.200s line %d: Bad cipher '%s'.",
|
|
filename, linenum, arg ? arg : "<NONE>");
|
|
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 (!ciphers_valid(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 (!mac_valid(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 (!kex_names_valid(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:
|
|
arg = strdelim(&s);
|
|
if (!arg || *arg == '\0')
|
|
fatal("%.200s line %d: Missing argument.", filename, linenum);
|
|
if (!key_names_valid2(arg))
|
|
fatal("%.200s line %d: Bad protocol 2 host key algorithms '%s'.",
|
|
filename, linenum, arg ? arg : "<NONE>");
|
|
if (*activep && options->hostkeyalgorithms == NULL)
|
|
options->hostkeyalgorithms = xstrdup(arg);
|
|
break;
|
|
|
|
case oProtocol:
|
|
intptr = &options->protocol;
|
|
arg = strdelim(&s);
|
|
if (!arg || *arg == '\0')
|
|
fatal("%.200s line %d: Missing argument.", filename, linenum);
|
|
value = proto_spec(arg);
|
|
if (value == SSH_PROTO_UNKNOWN)
|
|
fatal("%.200s line %d: Bad protocol spec '%s'.",
|
|
filename, linenum, arg ? arg : "<NONE>");
|
|
if (*activep && *intptr == SSH_PROTO_UNKNOWN)
|
|
*intptr = value;
|
|
break;
|
|
|
|
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 oLocalForward:
|
|
case oRemoteForward:
|
|
case oDynamicForward:
|
|
arg = strdelim(&s);
|
|
if (arg == NULL || *arg == '\0')
|
|
fatal("%.200s line %d: Missing port argument.",
|
|
filename, linenum);
|
|
|
|
if (opcode == oLocalForward ||
|
|
opcode == oRemoteForward) {
|
|
arg2 = strdelim(&s);
|
|
if (arg2 == NULL || *arg2 == '\0')
|
|
fatal("%.200s line %d: Missing target argument.",
|
|
filename, linenum);
|
|
|
|
/* construct a string for parse_forward */
|
|
snprintf(fwdarg, sizeof(fwdarg), "%s:%s", arg, arg2);
|
|
} else if (opcode == oDynamicForward) {
|
|
strlcpy(fwdarg, arg, sizeof(fwdarg));
|
|
}
|
|
|
|
if (parse_forward(&fwd, fwdarg,
|
|
opcode == oDynamicForward ? 1 : 0,
|
|
opcode == oRemoteForward ? 1 : 0) == 0)
|
|
fatal("%.200s line %d: Bad forwarding specification.",
|
|
filename, linenum);
|
|
|
|
if (*activep) {
|
|
if (opcode == oLocalForward ||
|
|
opcode == oDynamicForward)
|
|
add_local_forward(options, &fwd);
|
|
else if (opcode == oRemoteForward)
|
|
add_remote_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') {
|
|
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,
|
|
filename, linenum);
|
|
if (value < 0)
|
|
fatal("%.200s line %d: Bad Match condition", filename,
|
|
linenum);
|
|
*activep = value;
|
|
break;
|
|
|
|
case oEscapeChar:
|
|
intptr = &options->escape_char;
|
|
arg = strdelim(&s);
|
|
if (!arg || *arg == '\0')
|
|
fatal("%.200s line %d: Missing argument.", filename, linenum);
|
|
if (arg[0] == '^' && arg[2] == 0 &&
|
|
(u_char) arg[1] >= 64 && (u_char) arg[1] < 128)
|
|
value = (u_char) arg[1] & 31;
|
|
else if (strlen(arg) == 1)
|
|
value = (u_char) arg[0];
|
|
else if (strcmp(arg, "none") == 0)
|
|
value = SSH_ESCAPECHAR_NONE;
|
|
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 (options->num_send_env >= MAX_SEND_ENV)
|
|
fatal("%s line %d: too many send env.",
|
|
filename, linenum);
|
|
options->send_env[options->num_send_env++] =
|
|
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 oVisualHostKey:
|
|
intptr = &options->visual_host_key;
|
|
goto parse_flag;
|
|
|
|
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 oUseRoaming:
|
|
intptr = &options->use_roaming;
|
|
goto parse_flag;
|
|
|
|
case oRequestTTY:
|
|
intptr = &options->request_tty;
|
|
multistate_ptr = multistate_requesttty;
|
|
goto parse_multistate;
|
|
|
|
case oHPNDisabled:
|
|
intptr = &options->hpn_disabled;
|
|
goto parse_flag;
|
|
|
|
case oHPNBufferSize:
|
|
intptr = &options->hpn_buffer_size;
|
|
goto parse_int;
|
|
|
|
case oTcpRcvBufPoll:
|
|
intptr = &options->tcp_rcv_buf_poll;
|
|
goto parse_flag;
|
|
|
|
case oTcpRcvBuf:
|
|
intptr = &options->tcp_rcv_buf;
|
|
goto parse_int;
|
|
|
|
#ifdef NONE_CIPHER_ENABLED
|
|
case oNoneEnabled:
|
|
intptr = &options->none_enabled;
|
|
goto parse_flag;
|
|
|
|
/*
|
|
* We check to see if the command comes from the command line or not.
|
|
* If it does then enable it otherwise fail. NONE must never be a
|
|
* default configuration.
|
|
*/
|
|
case oNoneSwitch:
|
|
if (strcmp(filename,"command-line") == 0) {
|
|
intptr = &options->none_switch;
|
|
goto parse_flag;
|
|
} else {
|
|
debug("NoneSwitch directive found in %.200s.",
|
|
filename);
|
|
error("NoneSwitch is found in %.200s.\n"
|
|
"You may only use this configuration option "
|
|
"from the command line", filename);
|
|
error("Continuing...");
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
case oVersionAddendum:
|
|
if (s == NULL)
|
|
fatal("%.200s line %d: Missing argument.", filename,
|
|
linenum);
|
|
len = strspn(s, WHITESPACE);
|
|
if (*activep && options->version_addendum == NULL) {
|
|
if (strcasecmp(s + len, "none") == 0)
|
|
options->version_addendum = xstrdup("");
|
|
else if (strchr(s + len, '\r') != NULL)
|
|
fatal("%.200s line %d: Invalid argument",
|
|
filename, linenum);
|
|
else
|
|
options->version_addendum = xstrdup(s + len);
|
|
}
|
|
return 0;
|
|
|
|
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') {
|
|
valid_domain(arg, filename, linenum);
|
|
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 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("process_config_line: Unimplemented opcode %d", 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,
|
|
Options *options, int flags)
|
|
{
|
|
FILE *f;
|
|
char line[1024];
|
|
int active, linenum;
|
|
int bad_options = 0;
|
|
|
|
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.
|
|
*/
|
|
active = 1;
|
|
linenum = 0;
|
|
while (fgets(line, sizeof(line), f)) {
|
|
/* Update line number counter. */
|
|
linenum++;
|
|
if (process_config_line(options, pw, host, line, filename,
|
|
linenum, &active, flags & SSHCONF_USERCONF) != 0)
|
|
bad_options++;
|
|
}
|
|
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_x11 = -1;
|
|
options->forward_x11_trusted = -1;
|
|
options->forward_x11_timeout = -1;
|
|
options->exit_on_forward_failure = -1;
|
|
options->xauth_location = NULL;
|
|
options->gateway_ports = -1;
|
|
options->use_privileged_port = -1;
|
|
options->rsa_authentication = -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->rhosts_rsa_authentication = -1;
|
|
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->compression_level = -1;
|
|
options->port = -1;
|
|
options->address_family = -1;
|
|
options->connection_attempts = -1;
|
|
options->connection_timeout = -1;
|
|
options->number_of_password_prompts = -1;
|
|
options->cipher = -1;
|
|
options->ciphers = NULL;
|
|
options->macs = NULL;
|
|
options->kex_algorithms = NULL;
|
|
options->hostkeyalgorithms = NULL;
|
|
options->protocol = SSH_PROTO_UNKNOWN;
|
|
options->num_identity_files = 0;
|
|
options->hostname = NULL;
|
|
options->host_key_alias = NULL;
|
|
options->proxy_command = 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->clear_forwardings = -1;
|
|
options->log_level = SYSLOG_LEVEL_NOT_SET;
|
|
options->preferred_authentications = NULL;
|
|
options->bind_address = NULL;
|
|
options->pkcs11_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->num_send_env = 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->use_roaming = -1;
|
|
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->version_addendum = NULL;
|
|
options->hpn_disabled = -1;
|
|
options->hpn_buffer_size = -1;
|
|
options->tcp_rcv_buf_poll = -1;
|
|
options->tcp_rcv_buf = -1;
|
|
#ifdef NONE_CIPHER_ENABLED
|
|
options->none_enabled = -1;
|
|
options->none_switch = -1;
|
|
#endif
|
|
}
|
|
|
|
/*
|
|
* 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)
|
|
{
|
|
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;
|
|
if (options->exit_on_forward_failure == -1)
|
|
options->exit_on_forward_failure = 0;
|
|
if (options->xauth_location == NULL)
|
|
options->xauth_location = _PATH_XAUTH;
|
|
if (options->gateway_ports == -1)
|
|
options->gateway_ports = 0;
|
|
if (options->use_privileged_port == -1)
|
|
options->use_privileged_port = 0;
|
|
if (options->rsa_authentication == -1)
|
|
options->rsa_authentication = 1;
|
|
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->rhosts_rsa_authentication == -1)
|
|
options->rhosts_rsa_authentication = 0;
|
|
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 = 2; /* 2 is default */
|
|
if (options->compression == -1)
|
|
options->compression = 0;
|
|
if (options->tcp_keep_alive == -1)
|
|
options->tcp_keep_alive = 1;
|
|
if (options->compression_level == -1)
|
|
options->compression_level = 6;
|
|
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;
|
|
/* Selected in ssh_login(). */
|
|
if (options->cipher == -1)
|
|
options->cipher = SSH_CIPHER_NOT_SET;
|
|
/* options->ciphers, default set in myproposals.h */
|
|
/* options->macs, default set in myproposals.h */
|
|
/* options->kex_algorithms, default set in myproposals.h */
|
|
/* options->hostkeyalgorithms, default set in myproposals.h */
|
|
if (options->protocol == SSH_PROTO_UNKNOWN)
|
|
options->protocol = SSH_PROTO_2;
|
|
if (options->num_identity_files == 0) {
|
|
if (options->protocol & SSH_PROTO_1) {
|
|
add_identity_file(options, "~/",
|
|
_PATH_SSH_CLIENT_IDENTITY, 0);
|
|
}
|
|
if (options->protocol & SSH_PROTO_2) {
|
|
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);
|
|
#endif
|
|
add_identity_file(options, "~/",
|
|
_PATH_SSH_CLIENT_ID_ED25519, 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->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->clear_forwardings == 1)
|
|
clear_forwardings(options);
|
|
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 HAVE_LDNS
|
|
if (options->verify_host_key_dns == -1)
|
|
/* automatically trust a verified SSHFP record */
|
|
options->verify_host_key_dns = 1;
|
|
#else
|
|
if (options->verify_host_key_dns == -1)
|
|
options->verify_host_key_dns = 0;
|
|
#endif
|
|
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->use_roaming == -1)
|
|
options->use_roaming = 1;
|
|
if (options->visual_host_key == -1)
|
|
options->visual_host_key = 0;
|
|
if (options->ip_qos_interactive == -1)
|
|
options->ip_qos_interactive = IPTOS_LOWDELAY;
|
|
if (options->ip_qos_bulk == -1)
|
|
options->ip_qos_bulk = IPTOS_THROUGHPUT;
|
|
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;
|
|
#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->proxy_command);
|
|
CLEAR_ON_NONE(options->control_path);
|
|
/* 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 */
|
|
if (options->version_addendum == NULL)
|
|
options->version_addendum = xstrdup(SSH_VERSION_FREEBSD);
|
|
if (options->hpn_disabled == -1)
|
|
options->hpn_disabled = 0;
|
|
if (options->hpn_buffer_size > -1)
|
|
{
|
|
u_int maxlen;
|
|
|
|
/* If a user tries to set the size to 0 set it to 1KB. */
|
|
if (options->hpn_buffer_size == 0)
|
|
options->hpn_buffer_size = 1024;
|
|
/* Limit the buffer to BUFFER_MAX_LEN. */
|
|
maxlen = buffer_get_max_len();
|
|
if (options->hpn_buffer_size > (maxlen / 1024)) {
|
|
debug("User requested buffer larger than %ub: %ub. "
|
|
"Request reverted to %ub", maxlen,
|
|
options->hpn_buffer_size * 1024, maxlen);
|
|
options->hpn_buffer_size = maxlen;
|
|
}
|
|
debug("hpn_buffer_size set to %d", options->hpn_buffer_size);
|
|
}
|
|
if (options->tcp_rcv_buf == 0)
|
|
options->tcp_rcv_buf = 1;
|
|
if (options->tcp_rcv_buf > -1)
|
|
options->tcp_rcv_buf *= 1024;
|
|
if (options->tcp_rcv_buf_poll == -1)
|
|
options->tcp_rcv_buf_poll = 1;
|
|
#ifdef NONE_CIPHER_ENABLED
|
|
/* options->none_enabled must not be set by default */
|
|
if (options->none_switch == -1)
|
|
options->none_switch = 0;
|
|
#endif
|
|
}
|
|
|
|
/*
|
|
* parse_forward
|
|
* parses a string containing a port forwarding specification of the form:
|
|
* dynamicfwd == 0
|
|
* [listenhost:]listenport:connecthost:connectport
|
|
* dynamicfwd == 1
|
|
* [listenhost:]listenport
|
|
* returns number of arguments parsed or zero on error
|
|
*/
|
|
int
|
|
parse_forward(Forward *fwd, const char *fwdspec, int dynamicfwd, int remotefwd)
|
|
{
|
|
int i;
|
|
char *p, *cp, *fwdarg[4];
|
|
|
|
memset(fwd, '\0', sizeof(*fwd));
|
|
|
|
cp = p = xstrdup(fwdspec);
|
|
|
|
/* skip leading spaces */
|
|
while (isspace((u_char)*cp))
|
|
cp++;
|
|
|
|
for (i = 0; i < 4; ++i)
|
|
if ((fwdarg[i] = hpdelim(&cp)) == NULL)
|
|
break;
|
|
|
|
/* Check for trailing garbage */
|
|
if (cp != NULL)
|
|
i = 0; /* failure */
|
|
|
|
switch (i) {
|
|
case 1:
|
|
fwd->listen_host = NULL;
|
|
fwd->listen_port = a2port(fwdarg[0]);
|
|
fwd->connect_host = xstrdup("socks");
|
|
break;
|
|
|
|
case 2:
|
|
fwd->listen_host = xstrdup(cleanhostname(fwdarg[0]));
|
|
fwd->listen_port = a2port(fwdarg[1]);
|
|
fwd->connect_host = xstrdup("socks");
|
|
break;
|
|
|
|
case 3:
|
|
fwd->listen_host = NULL;
|
|
fwd->listen_port = a2port(fwdarg[0]);
|
|
fwd->connect_host = xstrdup(cleanhostname(fwdarg[1]));
|
|
fwd->connect_port = a2port(fwdarg[2]);
|
|
break;
|
|
|
|
case 4:
|
|
fwd->listen_host = xstrdup(cleanhostname(fwdarg[0]));
|
|
fwd->listen_port = a2port(fwdarg[1]);
|
|
fwd->connect_host = xstrdup(cleanhostname(fwdarg[2]));
|
|
fwd->connect_port = a2port(fwdarg[3]);
|
|
break;
|
|
default:
|
|
i = 0; /* failure */
|
|
}
|
|
|
|
free(p);
|
|
|
|
if (dynamicfwd) {
|
|
if (!(i == 1 || i == 2))
|
|
goto fail_free;
|
|
} else {
|
|
if (!(i == 3 || i == 4))
|
|
goto fail_free;
|
|
if (fwd->connect_port <= 0)
|
|
goto fail_free;
|
|
}
|
|
|
|
if (fwd->listen_port < 0 || (!remotefwd && fwd->listen_port == 0))
|
|
goto fail_free;
|
|
|
|
if (fwd->connect_host != NULL &&
|
|
strlen(fwd->connect_host) >= NI_MAXHOST)
|
|
goto fail_free;
|
|
if (fwd->listen_host != NULL &&
|
|
strlen(fwd->listen_host) >= NI_MAXHOST)
|
|
goto fail_free;
|
|
|
|
|
|
return (i);
|
|
|
|
fail_free:
|
|
free(fwd->connect_host);
|
|
fwd->connect_host = NULL;
|
|
free(fwd->listen_host);
|
|
fwd->listen_host = NULL;
|
|
return (0);
|
|
}
|