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NetBSD 6.1.5 - man page for kdc (netbsd section 8)

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KDC(8)				   BSD System Manager's Manual				   KDC(8)

NAME
     kdc -- Kerberos 5 server

SYNOPSIS
     kdc [-c file | --config-file=file] [-p | --no-require-preauth] [--max-request=size]
	 [-H | --enable-http] [--no-524] [--kerberos4] [--kerberos4-cross-realm] [-r string |
	 --v4-realm=string] [-K | --kaserver] [-P portspec | --ports=portspec] [--detach]
	 [--disable-des] [--addresses=list of addresses]

DESCRIPTION
     kdc serves requests for tickets.  When it starts, it first checks the flags passed, any
     options that are not specified with a command line flag are taken from a config file, or
     from a default compiled-in value.

     Options supported:

     -c file, --config-file=file
	     Specifies the location of the config file, the default is /var/heimdal/kdc.conf.
	     This is the only value that can't be specified in the config file.

     -p, --no-require-preauth
	     Turn off the requirement for pre-autentication in the initial AS-REQ for all princi-
	     pals.  The use of pre-authentication makes it more difficult to do offline password
	     attacks.  You might want to turn it off if you have clients that don't support pre-
	     authentication.  Since the version 4 protocol doesn't support any pre-authentica-
	     tion, serving version 4 clients is just about the same as not requiring pre-athenti-
	     cation.  The default is to require pre-authentication.  Adding the require-preauth
	     per principal is a more flexible way of handling this.

     --max-request=size
	     Gives an upper limit on the size of the requests that the kdc is willing to handle.

     -H, --enable-http
	     Makes the kdc listen on port 80 and handle requests encapsulated in HTTP.

     --no-524
	     don't respond to 524 requests

     --kerberos4
	     respond to Kerberos 4 requests

     --kerberos4-cross-realm
	     respond to Kerberos 4 requests from foreign realms.  This is a known security hole
	     and should not be enabled unless you understand the consequences and are willing to
	     live with them.

     -r string, --v4-realm=string
	     What realm this server should act as when dealing with version 4 requests.  The
	     database can contain any number of realms, but since the version 4 protocol doesn't
	     contain a realm for the server, it must be explicitly specified.  The default is
	     whatever is returned by krb_get_lrealm().	This option is only available if the KDC
	     has been compiled with version 4 support.

     -K, --kaserver
	     Enable kaserver emulation (in case it's compiled in).

     -P portspec, --ports=portspec
	     Specifies the set of ports the KDC should listen on.  It is given as a white-space
	     separated list of services or port numbers.

     --addresses=list of addresses
	     The list of addresses to listen for requests on.  By default, the kdc will listen on
	     all the locally configured addresses.  If only a subset is desired, or the automatic
	     detection fails, this option might be used.

     --detach
	     detach from pty and run as a daemon.

     --disable-des
	     disable add des encryption types, makes the kdc not use them.

     All activities are logged to one or more destinations, see krb5.conf(5), and
     krb5_openlog(3).  The entity used for logging is kdc.

CONFIGURATION FILE
     The configuration file has the same syntax as krb5.conf(5), but will be read before
     /etc/krb5.conf, so it may override settings found there.  Options specific to the KDC only
     are found in the ``[kdc]'' section.  All the command-line options can preferably be added in
     the configuration file.  The only difference is the pre-authentication flag, which has to be
     specified as:

	   require-preauth = no

     (in fact you can specify the option as --require-preauth=no).

     And there are some configuration options which do not have command-line equivalents:

	   enable-digest = boolean
		turn on support for digest processing in the KDC.  The default is FALSE.

	   check-ticket-addresses = boolean
		Check the addresses in the ticket when processing TGS requests.  The default is
		TRUE.

	   allow-null-ticket-addresses = boolean
		Permit tickets with no addresses.  This option is only relevant when check-
		ticket-addresses is TRUE.

	   allow-anonymous = boolean
		Permit anonymous tickets with no addresses.

	   max-kdc-datagram-reply-length = number
		Maximum packet size the UDP rely that the KDC will transmit, instead the KDC
		sends back a reply telling the client to use TCP instead.

	   transited-policy = always-check | allow-per-principal | always-honour-request
		This controls how KDC requests with the disable-transited-check flag are handled.
		It can be one of:

		      always-check
			   Always check transited encoding, this is the default.

		      allow-per-principal
			   Currently this is identical to always-check.  In a future release, it
			   will be possible to mark a principal as able to handle unchecked
			   requests.

		      always-honour-request
			   Always do what the client asked.  In a future release, it will be pos-
			   sible to force a check per principal.

	   encode_as_rep_as_tgs_rep = boolean
		Encode AS-Rep as TGS-Rep to be bug-compatible with old DCE code.  The Heimdal
		clients allow both.

	   kdc_warn_pwexpire = time
		How long before password/principal expiration the KDC should start sending out
		warning messages.

     The configuration file is only read when the kdc is started.  If changes made to the config-
     uration file are to take effect, the kdc needs to be restarted.

     An example of a config file:

	   [kdc]
		   require-preauth = no
		   v4-realm = FOO.SE

BUGS
     If the machine running the KDC has new addresses added to it, the KDC will have to be
     restarted to listen to them.  The reason it doesn't just listen to wildcarded (like
     INADDR_ANY) addresses, is that the replies has to come from the same address they were sent
     to, and most OS:es doesn't pass this information to the application.  If your normal mode of
     operation require that you add and remove addresses, the best option is probably to listen
     to a wildcarded TCP socket, and make sure your clients use TCP to connect.  For instance,
     this will listen to IPv4 TCP port 88 only:

	   kdc --addresses=0.0.0.0 --ports="88/tcp"

     There should be a way to specify protocol, port, and address triplets, not just addresses
     and protocol, port tuples.

SEE ALSO
     kinit(1), krb5.conf(5)

BSD					 August 24, 2006				      BSD
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