929 lines
27 KiB
C
929 lines
27 KiB
C
/* $NetBSD: readconf.c,v 1.12 2001/11/07 06:26:47 itojun Exp $ */
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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("$OpenBSD: readconf.c,v 1.91 2001/10/01 21:51:16 markus Exp $");
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#include "ssh.h"
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#include "xmalloc.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 "readconf.h"
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#include "match.h"
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#include "misc.h"
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#include "kex.h"
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#include "mac.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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FallBackToRsh no
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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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RhostsAuthentication no
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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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UseRsh yes
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Host *.su
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Cipher none
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PasswordAuthentication no
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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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RhostsAuthentication yes
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PasswordAuthentication yes
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RSAAuthentication yes
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RhostsRSAAuthentication yes
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FallBackToRsh no
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UseRsh no
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StrictHostKeyChecking yes
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KeepAlives 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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oForwardAgent, oForwardX11, oGatewayPorts, oRhostsAuthentication,
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oPasswordAuthentication, oRSAAuthentication, oFallBackToRsh, oUseRsh,
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oChallengeResponseAuthentication, oXAuthLocation,
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#if defined(KRB4) || defined(KRB5)
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oKerberosAuthentication,
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#endif
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#if defined(AFS) || defined(KRB5)
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oKerberosTgtPassing,
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#endif
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#ifdef AFS
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oAFSTokenPassing,
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#endif
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oIdentityFile, oHostName, oPort, oCipher, oRemoteForward, oLocalForward,
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oUser, oHost, oEscapeChar, oRhostsRSAAuthentication, oProxyCommand,
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oGlobalKnownHostsFile, oUserKnownHostsFile, oConnectionAttempts,
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oBatchMode, oCheckHostIP, oStrictHostKeyChecking, oCompression,
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oCompressionLevel, oKeepAlives, 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, oSmartcardDevice,
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oClearAllForwardings, oNoHostAuthenticationForLocalhost
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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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{ "xauthlocation", oXAuthLocation },
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{ "gatewayports", oGatewayPorts },
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{ "useprivilegedport", oUsePrivilegedPort },
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{ "rhostsauthentication", oRhostsAuthentication },
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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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#if defined(KRB4) || defined(KRB5)
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{ "kerberosauthentication", oKerberosAuthentication },
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#endif
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#if defined(AFS) || defined(KRB5)
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{ "kerberostgtpassing", oKerberosTgtPassing },
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{ "kerberos5tgtpassing", oKerberosTgtPassing }, /* alias */
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{ "kerberos4tgtpassing", oKerberosTgtPassing }, /* alias */
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#endif
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#ifdef AFS
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{ "afstokenpassing", oAFSTokenPassing },
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#endif
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{ "fallbacktorsh", oFallBackToRsh },
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{ "usersh", oUseRsh },
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{ "identityfile", oIdentityFile },
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{ "identityfile2", oIdentityFile }, /* alias */
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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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{ "escapechar", oEscapeChar },
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{ "globalknownhostsfile", oGlobalKnownHostsFile },
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{ "userknownhostsfile", oUserKnownHostsFile }, /* obsolete */
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{ "globalknownhostsfile2", oGlobalKnownHostsFile2 },
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{ "userknownhostsfile2", oUserKnownHostsFile2 }, /* obsolete */
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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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{ "keepalive", oKeepAlives },
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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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{ "smartcarddevice", oSmartcardDevice },
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{ "clearallforwardings", oClearAllForwardings },
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{ "nohostauthenticationforlocalhost", oNoHostAuthenticationForLocalhost },
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{ NULL, 0 }
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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, u_short port, const char *host,
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u_short host_port)
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{
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Forward *fwd;
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extern uid_t original_real_uid;
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if (port < IPPORT_RESERVED && original_real_uid != 0)
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fatal("Privileged ports can only be forwarded by root.");
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if (options->num_local_forwards >= SSH_MAX_FORWARDS_PER_DIRECTION)
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fatal("Too many local forwards (max %d).", SSH_MAX_FORWARDS_PER_DIRECTION);
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fwd = &options->local_forwards[options->num_local_forwards++];
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fwd->port = port;
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fwd->host = xstrdup(host);
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fwd->host_port = host_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, u_short port, const char *host,
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u_short host_port)
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{
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Forward *fwd;
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if (options->num_remote_forwards >= SSH_MAX_FORWARDS_PER_DIRECTION)
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fatal("Too many remote forwards (max %d).",
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SSH_MAX_FORWARDS_PER_DIRECTION);
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fwd = &options->remote_forwards[options->num_remote_forwards++];
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fwd->port = port;
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fwd->host = xstrdup(host);
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fwd->host_port = host_port;
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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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xfree(options->local_forwards[i].host);
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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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xfree(options->remote_forwards[i].host);
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options->num_remote_forwards = 0;
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}
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/*
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* Returns the number of the token pointed to by cp or oBadOption.
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*/
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static OpCodes
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parse_token(const char *cp, const char *filename, int linenum)
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{
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u_int i;
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for (i = 0; keywords[i].name; i++)
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if (strcasecmp(cp, keywords[i].name) == 0)
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return keywords[i].opcode;
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error("%s: line %d: Bad configuration option: %s",
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filename, linenum, cp);
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return oBadOption;
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}
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/*
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* Processes a single option line as used in the configuration files. This
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* only sets those values that have not already been set.
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*/
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int
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process_config_line(Options *options, const char *host,
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char *line, const char *filename, int linenum,
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int *activep)
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{
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char buf[256], *s, *string, **charptr, *endofnumber, *keyword, *arg;
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int opcode, *intptr, value;
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u_short fwd_port, fwd_host_port;
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char sfwd_host_port[6];
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s = line;
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/* Get the keyword. (Each line is supposed to begin with a keyword). */
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keyword = strdelim(&s);
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/* Ignore leading whitespace. */
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if (*keyword == '\0')
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keyword = strdelim(&s);
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if (keyword == NULL || !*keyword || *keyword == '\n' || *keyword == '#')
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return 0;
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opcode = parse_token(keyword, filename, linenum);
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switch (opcode) {
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case oBadOption:
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/* don't panic, but count bad options */
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return -1;
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/* NOTREACHED */
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case oForwardAgent:
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intptr = &options->forward_agent;
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parse_flag:
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arg = strdelim(&s);
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if (!arg || *arg == '\0')
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fatal("%.200s line %d: Missing yes/no argument.", filename, linenum);
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value = 0; /* To avoid compiler warning... */
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if (strcmp(arg, "yes") == 0 || strcmp(arg, "true") == 0)
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value = 1;
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else if (strcmp(arg, "no") == 0 || strcmp(arg, "false") == 0)
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value = 0;
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else
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fatal("%.200s line %d: Bad yes/no argument.", filename, linenum);
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if (*activep && *intptr == -1)
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*intptr = value;
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break;
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case oForwardX11:
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intptr = &options->forward_x11;
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goto parse_flag;
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case oGatewayPorts:
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intptr = &options->gateway_ports;
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goto parse_flag;
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case oUsePrivilegedPort:
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intptr = &options->use_privileged_port;
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goto parse_flag;
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case oRhostsAuthentication:
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intptr = &options->rhosts_authentication;
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goto parse_flag;
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case oPasswordAuthentication:
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intptr = &options->password_authentication;
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goto parse_flag;
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case oKbdInteractiveAuthentication:
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intptr = &options->kbd_interactive_authentication;
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goto parse_flag;
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case oKbdInteractiveDevices:
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charptr = &options->kbd_interactive_devices;
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goto parse_string;
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case oPubkeyAuthentication:
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intptr = &options->pubkey_authentication;
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goto parse_flag;
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case oRSAAuthentication:
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intptr = &options->rsa_authentication;
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goto parse_flag;
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case oRhostsRSAAuthentication:
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intptr = &options->rhosts_rsa_authentication;
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goto parse_flag;
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case oHostbasedAuthentication:
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intptr = &options->hostbased_authentication;
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goto parse_flag;
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case oChallengeResponseAuthentication:
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intptr = &options->challenge_response_authentication;
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goto parse_flag;
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#if defined(KRB4) || defined(KRB5)
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case oKerberosAuthentication:
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intptr = &options->kerberos_authentication;
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goto parse_flag;
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#endif
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#if defined(AFS) || defined(KRB5)
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case oKerberosTgtPassing:
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intptr = &options->kerberos_tgt_passing;
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goto parse_flag;
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#endif
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#ifdef AFS
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case oAFSTokenPassing:
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intptr = &options->afs_token_passing;
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goto parse_flag;
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#endif
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case oFallBackToRsh:
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intptr = &options->fallback_to_rsh;
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goto parse_flag;
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case oUseRsh:
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intptr = &options->use_rsh;
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goto parse_flag;
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case oBatchMode:
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intptr = &options->batch_mode;
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goto parse_flag;
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case oCheckHostIP:
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intptr = &options->check_host_ip;
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goto parse_flag;
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case oStrictHostKeyChecking:
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intptr = &options->strict_host_key_checking;
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arg = strdelim(&s);
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if (!arg || *arg == '\0')
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fatal("%.200s line %d: Missing yes/no/ask argument.",
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filename, linenum);
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value = 0; /* To avoid compiler warning... */
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if (strcmp(arg, "yes") == 0 || strcmp(arg, "true") == 0)
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value = 1;
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else if (strcmp(arg, "no") == 0 || strcmp(arg, "false") == 0)
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value = 0;
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else if (strcmp(arg, "ask") == 0)
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value = 2;
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else
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fatal("%.200s line %d: Bad yes/no/ask argument.", filename, linenum);
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if (*activep && *intptr == -1)
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*intptr = value;
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break;
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case oCompression:
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intptr = &options->compression;
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goto parse_flag;
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|
|
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case oKeepAlives:
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intptr = &options->keepalives;
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goto parse_flag;
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|
|
|
case oNoHostAuthenticationForLocalhost:
|
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intptr = &options->no_host_authentication_for_localhost;
|
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goto parse_flag;
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|
|
|
case oNumberOfPasswordPrompts:
|
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intptr = &options->number_of_password_prompts;
|
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goto parse_int;
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|
|
case oCompressionLevel:
|
|
intptr = &options->compression_level;
|
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goto parse_int;
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|
|
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case oIdentityFile:
|
|
arg = strdelim(&s);
|
|
if (!arg || *arg == '\0')
|
|
fatal("%.200s line %d: Missing argument.", filename, linenum);
|
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if (*activep) {
|
|
intptr = &options->num_identity_files;
|
|
if (*intptr >= SSH_MAX_IDENTITY_FILES)
|
|
fatal("%.200s line %d: Too many identity files specified (max %d).",
|
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filename, linenum, SSH_MAX_IDENTITY_FILES);
|
|
charptr = &options->identity_files[*intptr];
|
|
*charptr = xstrdup(arg);
|
|
*intptr = *intptr + 1;
|
|
}
|
|
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:
|
|
charptr = &options->system_hostfile;
|
|
goto parse_string;
|
|
|
|
case oUserKnownHostsFile:
|
|
charptr = &options->user_hostfile;
|
|
goto parse_string;
|
|
|
|
case oGlobalKnownHostsFile2:
|
|
charptr = &options->system_hostfile2;
|
|
goto parse_string;
|
|
|
|
case oUserKnownHostsFile2:
|
|
charptr = &options->user_hostfile2;
|
|
goto parse_string;
|
|
|
|
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 oSmartcardDevice:
|
|
charptr = &options->smartcard_device;
|
|
goto parse_string;
|
|
|
|
case oProxyCommand:
|
|
charptr = &options->proxy_command;
|
|
string = xstrdup("");
|
|
while ((arg = strdelim(&s)) != NULL && *arg != '\0') {
|
|
string = xrealloc(string, strlen(string) + strlen(arg) + 2);
|
|
strcat(string, " ");
|
|
strcat(string, arg);
|
|
}
|
|
if (*activep && *charptr == NULL)
|
|
*charptr = string;
|
|
else
|
|
xfree(string);
|
|
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 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:
|
|
intptr = (int *) &options->log_level;
|
|
arg = strdelim(&s);
|
|
value = log_level_number(arg);
|
|
if (value == (LogLevel) - 1)
|
|
fatal("%.200s line %d: unsupported log level '%s'",
|
|
filename, linenum, arg ? arg : "<NONE>");
|
|
if (*activep && (LogLevel) * intptr == -1)
|
|
*intptr = (LogLevel) value;
|
|
break;
|
|
|
|
case oLocalForward:
|
|
case oRemoteForward:
|
|
arg = strdelim(&s);
|
|
if (!arg || *arg == '\0')
|
|
fatal("%.200s line %d: Missing port argument.",
|
|
filename, linenum);
|
|
if ((fwd_port = a2port(arg)) == 0)
|
|
fatal("%.200s line %d: Bad listen port.",
|
|
filename, linenum);
|
|
arg = strdelim(&s);
|
|
if (!arg || *arg == '\0')
|
|
fatal("%.200s line %d: Missing second argument.",
|
|
filename, linenum);
|
|
if (sscanf(arg, "%255[^:]:%5[0-9]", buf, sfwd_host_port) != 2 &&
|
|
sscanf(arg, "%255[^/]/%5[0-9]", buf, sfwd_host_port) != 2)
|
|
fatal("%.200s line %d: Bad forwarding specification.",
|
|
filename, linenum);
|
|
if ((fwd_host_port = a2port(sfwd_host_port)) == 0)
|
|
fatal("%.200s line %d: Bad forwarding port.",
|
|
filename, linenum);
|
|
if (*activep) {
|
|
if (opcode == oLocalForward)
|
|
add_local_forward(options, fwd_port, buf,
|
|
fwd_host_port);
|
|
else if (opcode == oRemoteForward)
|
|
add_remote_forward(options, fwd_port, buf,
|
|
fwd_host_port);
|
|
}
|
|
break;
|
|
|
|
case oDynamicForward:
|
|
arg = strdelim(&s);
|
|
if (!arg || *arg == '\0')
|
|
fatal("%.200s line %d: Missing port argument.",
|
|
filename, linenum);
|
|
fwd_port = a2port(arg);
|
|
if (fwd_port == 0)
|
|
fatal("%.200s line %d: Badly formatted port number.",
|
|
filename, linenum);
|
|
if (*activep)
|
|
add_local_forward(options, fwd_port, "socks4", 0);
|
|
break;
|
|
|
|
case oClearAllForwardings:
|
|
intptr = &options->clear_forwardings;
|
|
goto parse_flag;
|
|
|
|
case oHost:
|
|
*activep = 0;
|
|
while ((arg = strdelim(&s)) != NULL && *arg != '\0')
|
|
if (match_pattern(host, arg)) {
|
|
debug("Applying options for %.100s", arg);
|
|
*activep = 1;
|
|
break;
|
|
}
|
|
/* Avoid garbage check below, as strdelim is done. */
|
|
return 0;
|
|
|
|
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;
|
|
|
|
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, const char *host, Options *options)
|
|
{
|
|
FILE *f;
|
|
char line[1024];
|
|
int active, linenum;
|
|
int bad_options = 0;
|
|
|
|
/* Open the file. */
|
|
f = fopen(filename, "r");
|
|
if (!f)
|
|
return 0;
|
|
|
|
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, host, line, filename, linenum, &active) != 0)
|
|
bad_options++;
|
|
}
|
|
fclose(f);
|
|
if (bad_options > 0)
|
|
fatal("%s: terminating, %d bad configuration options",
|
|
filename, bad_options);
|
|
return 1;
|
|
}
|
|
|
|
/*
|
|
* 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->xauth_location = NULL;
|
|
options->gateway_ports = -1;
|
|
options->use_privileged_port = -1;
|
|
options->rhosts_authentication = -1;
|
|
options->rsa_authentication = -1;
|
|
options->pubkey_authentication = -1;
|
|
options->challenge_response_authentication = -1;
|
|
#if defined(KRB4) || defined(KRB5)
|
|
options->kerberos_authentication = -1;
|
|
#endif
|
|
#if defined(AFS) || defined(KRB5)
|
|
options->kerberos_tgt_passing = -1;
|
|
#endif
|
|
#ifdef AFS
|
|
options->afs_token_passing = -1;
|
|
#endif
|
|
options->password_authentication = -1;
|
|
options->kbd_interactive_authentication = -1;
|
|
options->kbd_interactive_devices = NULL;
|
|
options->rhosts_rsa_authentication = -1;
|
|
options->hostbased_authentication = -1;
|
|
options->fallback_to_rsh = -1;
|
|
options->use_rsh = -1;
|
|
options->batch_mode = -1;
|
|
options->check_host_ip = -1;
|
|
options->strict_host_key_checking = -1;
|
|
options->compression = -1;
|
|
options->keepalives = -1;
|
|
options->compression_level = -1;
|
|
options->port = -1;
|
|
options->connection_attempts = -1;
|
|
options->number_of_password_prompts = -1;
|
|
options->cipher = -1;
|
|
options->ciphers = NULL;
|
|
options->macs = 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->system_hostfile = NULL;
|
|
options->user_hostfile = NULL;
|
|
options->system_hostfile2 = NULL;
|
|
options->user_hostfile2 = NULL;
|
|
options->num_local_forwards = 0;
|
|
options->num_remote_forwards = 0;
|
|
options->clear_forwardings = -1;
|
|
options->log_level = (LogLevel) - 1;
|
|
options->preferred_authentications = NULL;
|
|
options->bind_address = NULL;
|
|
options->smartcard_device = NULL;
|
|
options->no_host_authentication_for_localhost = - 1;
|
|
}
|
|
|
|
/*
|
|
* 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)
|
|
{
|
|
int len;
|
|
|
|
if (options->forward_agent == -1)
|
|
options->forward_agent = 0;
|
|
if (options->forward_x11 == -1)
|
|
options->forward_x11 = 0;
|
|
#ifdef _PATH_XAUTH
|
|
if (options->xauth_location == NULL)
|
|
options->xauth_location = _PATH_XAUTH;
|
|
#endif
|
|
if (options->gateway_ports == -1)
|
|
options->gateway_ports = 0;
|
|
if (options->use_privileged_port == -1)
|
|
options->use_privileged_port = 0;
|
|
if (options->rhosts_authentication == -1)
|
|
options->rhosts_authentication = 1;
|
|
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 defined(KRB4) || defined(KRB5)
|
|
if (options->kerberos_authentication == -1)
|
|
options->kerberos_authentication = 1;
|
|
#endif
|
|
#if defined(AFS) || defined(KRB5)
|
|
if (options->kerberos_tgt_passing == -1)
|
|
options->kerberos_tgt_passing = 1;
|
|
#endif
|
|
#ifdef AFS
|
|
if (options->afs_token_passing == -1)
|
|
options->afs_token_passing = 1;
|
|
#endif
|
|
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 = 1;
|
|
if (options->hostbased_authentication == -1)
|
|
options->hostbased_authentication = 0;
|
|
if (options->fallback_to_rsh == -1)
|
|
options->fallback_to_rsh = 0;
|
|
if (options->use_rsh == -1)
|
|
options->use_rsh = 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 = 2; /* 2 is default */
|
|
if (options->compression == -1)
|
|
options->compression = 0;
|
|
if (options->keepalives == -1)
|
|
options->keepalives = 1;
|
|
if (options->compression_level == -1)
|
|
options->compression_level = 6;
|
|
if (options->port == -1)
|
|
options->port = 0; /* Filled in ssh_connect. */
|
|
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->hostkeyalgorithms, default set in myproposals.h */
|
|
if (options->protocol == SSH_PROTO_UNKNOWN)
|
|
options->protocol = SSH_PROTO_1|SSH_PROTO_2;
|
|
if (options->num_identity_files == 0) {
|
|
if (options->protocol & SSH_PROTO_1) {
|
|
len = 2 + strlen(_PATH_SSH_CLIENT_IDENTITY) + 1;
|
|
options->identity_files[options->num_identity_files] =
|
|
xmalloc(len);
|
|
snprintf(options->identity_files[options->num_identity_files++],
|
|
len, "~/%.100s", _PATH_SSH_CLIENT_IDENTITY);
|
|
}
|
|
if (options->protocol & SSH_PROTO_2) {
|
|
len = 2 + strlen(_PATH_SSH_CLIENT_ID_RSA) + 1;
|
|
options->identity_files[options->num_identity_files] =
|
|
xmalloc(len);
|
|
snprintf(options->identity_files[options->num_identity_files++],
|
|
len, "~/%.100s", _PATH_SSH_CLIENT_ID_RSA);
|
|
|
|
len = 2 + strlen(_PATH_SSH_CLIENT_ID_DSA) + 1;
|
|
options->identity_files[options->num_identity_files] =
|
|
xmalloc(len);
|
|
snprintf(options->identity_files[options->num_identity_files++],
|
|
len, "~/%.100s", _PATH_SSH_CLIENT_ID_DSA);
|
|
}
|
|
}
|
|
if (options->escape_char == -1)
|
|
options->escape_char = '~';
|
|
if (options->system_hostfile == NULL)
|
|
options->system_hostfile = _PATH_SSH_SYSTEM_HOSTFILE;
|
|
if (options->user_hostfile == NULL)
|
|
options->user_hostfile = _PATH_SSH_USER_HOSTFILE;
|
|
if (options->system_hostfile2 == NULL)
|
|
options->system_hostfile2 = _PATH_SSH_SYSTEM_HOSTFILE2;
|
|
if (options->user_hostfile2 == NULL)
|
|
options->user_hostfile2 = _PATH_SSH_USER_HOSTFILE2;
|
|
if (options->log_level == (LogLevel) - 1)
|
|
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;
|
|
/* options->proxy_command should not be set by default */
|
|
/* 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 */
|
|
}
|