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KRB5.CONF(5)		    BSD File Formats Manual		  KRB5.CONF(5)

     krb5.conf — configuration file for Kerberos 5

     #include <krb5.h>

     The krb5.conf file specifies several configuration parameters for the
     Kerberos 5 library, as well as for some programs.

     The file consists of one or more sections, containing a number of bind‐
     ings.  The value of each binding can be either a string or a list of
     other bindings.  The grammar looks like:

		   /* empty */

		   section sections

		   '[' section_name ']' bindings


		   binding bindings

		   name '=' STRING
		   name '=' '{' bindings '}'


     STRINGs consists of one or more non-whitespace characters.

     STRINGs that are specified later in this man-page uses the following

		values can be either yes/true or no/false.

		values can be a list of year, month, day, hour, min, second.
		Example: 1 month 2 days 30 min.	 If no unit is given, seconds
		is assumed.

		valid encryption types are: des-cbc-crc, des-cbc-md4, des-cbc-
		md5, des3-cbc-sha1, arcfour-hmac-md5, aes128-cts-hmac-sha1-96,
		and aes256-cts-hmac-sha1-96 .

		an address can be either a IPv4 or a IPv6 address.

     Currently recognised sections and bindings are:

		Specifies the default values to be used for Kerberos applica‐
		tions.	You can specify defaults per application, realm, or a
		combination of these.  The preference order is:
		1.   application realm option
		2.   application option
		3.   realm option
		4.   option

		The supported options are:

		      forwardable = boolean
			   When obtaining initial credentials, make the cre‐
			   dentials forwardable.

		      proxiable = boolean
			   When obtaining initial credentials, make the cre‐
			   dentials proxiable.

		      no-addresses = boolean
			   When obtaining initial credentials, request them
			   for an empty set of addresses, making the tickets
			   valid from any address.

		      ticket_lifetime = time
			   Default ticket lifetime.

		      renew_lifetime = time
			   Default renewable ticket lifetime.

		      encrypt = boolean
			   Use encryption, when available.

		      forward = boolean
			   Forward credentials to remote host (for rsh(1),
			   telnet(1), etc).


		      default_realm = REALM
			   Default realm to use, this is also known as your
			   “local realm”.  The default is the result of
			   krb5_get_host_realm(local hostname).

		      clockskew = time
			   Maximum time differential (in seconds) allowed when
			   comparing times.  Default is 300 seconds (five min‐

		      kdc_timeout = time
			   Maximum time to wait for a reply from the kdc,
			   default is 3 seconds.


			   These are described in the
			   krb5_425_conv_principal(3) manual page.

		      capath = {

				 destination-realm = next-hop-realm


			   This is deprecated, see the capaths section below.

		      default_cc_name = ccname
			   the default credentials cache name.	The string can
			   contain variables that are expanded on runtime.
			   Only support variable now is %{uid} that expands to
			   the current user id.

		      default_etypes = etypes ...
			   A list of default encryption types to use.

		      default_etypes_des = etypes ...
			   A list of default encryption types to use when
			   requesting a DES credential.

		      default_keytab_name = keytab
			   The keytab to use if no other is specified, default
			   is “FILE:/etc/krb5.keytab”.

		      dns_lookup_kdc = boolean
			   Use DNS SRV records to lookup KDC services loca‐

		      dns_lookup_realm = boolean
			   Use DNS TXT records to lookup domain to realm map‐

		      kdc_timesync = boolean
			   Try to keep track of the time differential between
			   the local machine and the KDC, and then compensate
			   for that when issuing requests.

		      max_retries = number
			   The max number of times to try to contact each KDC.

		      large_msg_size = number
			   The threshold where protocols with tiny maximum
			   message sizes are not considered usable to send
			   messages to the KDC.

		      ticket_lifetime = time
			   Default ticket lifetime.

		      renew_lifetime = time
			   Default renewable ticket lifetime.

		      forwardable = boolean
			   When obtaining initial credentials, make the cre‐
			   dentials forwardable.  This option is also valid in
			   the [realms] section.

		      proxiable = boolean
			   When obtaining initial credentials, make the cre‐
			   dentials proxiable.	This option is also valid in
			   the [realms] section.

		      verify_ap_req_nofail = boolean
			   If enabled, failure to verify credentials against a
			   local key is a fatal error.	The application has to
			   be able to read the corresponding service key for
			   this to work.  Some applications, like su(1),
			   enable this option unconditionally.

		      warn_pwexpire = time
			   How soon to warn for expiring password.  Default is
			   seven days.

		      http_proxy = proxy-spec
			   A HTTP-proxy to use when talking to the KDC via

		      dns_proxy = proxy-spec
			   Enable using DNS via HTTP.

		      extra_addresses = address ...
			   A list of addresses to get tickets for along with
			   all local addresses.

		      time_format = string
			   How to print time strings in logs, this string is
			   passed to strftime(3).

		      date_format = string
			   How to print date strings in logs, this string is
			   passed to strftime(3).

		      log_utc = boolean
			   Write log-entries using UTC instead of your local
			   time zone.

		      scan_interfaces = boolean
			   Scan all network interfaces for addresses, as
			   opposed to simply using the address associated with
			   the system's host name.

		      fcache_version = int
			   Use file credential cache format version specified.

		      krb4_get_tickets = boolean
			   Also get Kerberos 4 tickets in kinit, login, and
			   other programs.  This option is also valid in the
			   [realms] section.

		      fcc-mit-ticketflags = boolean
			   Use MIT compatible format for file credential
			   cache.  It's the field ticketflags that is stored
			   in reverse bit order for older than Heimdal 0.7.
			   Setting this flag to TRUE make it store the MIT
			   way, this is default for Heimdal 0.7.

		This is a list of mappings from DNS domain to Kerberos realm.
		Each binding in this section looks like:

		      domain = realm

		The domain can be either a full name of a host or a trailing
		component, in the latter case the domain-string should start
		with a period.	The trailing component only matches hosts that
		are in the same domain, ie “” matches
		“”, but not “”.

		The realm may be the token `dns_locate', in which case the
		actual realm will be determined using DNS (independently of
		the setting of the `dns_lookup_realm' option).


		      REALM = {

				 kdc = [service/]host[:port]
				      Specifies a list of kdcs for this realm.
				      If the optional port is absent, the
				      default value for the “kerberos/udp”
				      “kerberos/tcp”, and “http/tcp” port
				      (depending on service) will be used.
				      The kdcs will be used in the order that
				      they are specified.

				      The optional service specifies over what
				      medium the kdc should be contacted.
				      Possible services are “udp”, “tcp”, and
				      “http”.  Http can also be written as
				      “http://”.  Default service is “udp” and

				 admin_server = host[:port]
				      Specifies the admin server for this
				      realm, where all the modifications to
				      the database are performed.

				 kpasswd_server = host[:port]
				      Points to the server where all the pass‐
				      word changes are performed.  If there is
				      no such entry, the kpasswd port on the
				      admin_server host will be tried.

				 krb524_server = host[:port]
				      Points to the server that does 524 con‐
				      versions.	 If it is not mentioned, the
				      krb524 port on the kdcs will be tried.



				      See krb5_425_conv_principal(3).

				      a boolan variable that defaults to
				      false.  Old DCE secd (pre 1.1) might
				      need this to be true.



		      client-realm = {

				 server-realm = hop-realm ...
				      This serves two purposes. First the
				      first listed hop-realm tells a client
				      which realm it should contact in order
				      to ultimately obtain credentials for a
				      service in the server-realm.  Secondly,
				      it tells the KDC (and other servers)
				      which realms are allowed in a multi-hop
				      traversal from client-realm to
				      server-realm.  Except for the client
				      case, the order of the realms are not



		      entity = destination
			   Specifies that entity should use the specified
			   destination for logging.  See the krb5_openlog(3)
			   manual page for a list of defined destinations.


		      database = {

				 dbname = DATABASENAME
				      Use this database for this realm.	 See
				      the info documetation how to configure
				      diffrent database backends.

				 realm = REALM
				      Specifies the realm that will be stored
				      in this database.	 It realm isn't set,
				      it will used as the default database,
				      there can only be one entry that doesn't
				      have a realm stanza.

				 mkey_file = FILENAME
				      Use this keytab file for the master key
				      of this database.	 If not specified
				      DATABASENAME.mkey will be used.

				 acl_file = PA FILENAME
				      Use this file for the ACL list of this

				 log_file = FILENAME
				      Use this file as the log of changes per‐
				      formed to the database.  This file is
				      used by ipropd-master for propagating
				      changes to slaves.


		      max-request = SIZE
			   Maximum size of a kdc request.

		      require-preauth = BOOL
			   If set pre-authentication is required.  Since krb4
			   requests are not pre-authenticated they will be

		      ports = list of ports
			   List of ports the kdc should listen to.

		      addresses = list of interfaces
			   List of addresses the kdc should bind to.

		      enable-kerberos4 = BOOL
			   Turn on Kerberos 4 support.

		      v4-realm = REALM
			   To what realm v4 requests should be mapped.

		      enable-524 = BOOL
			   Should the Kerberos 524 converting facility be
			   turned on.  Default is the same as

		      enable-http = BOOL
			   Should the kdc answer kdc-requests over http.

		      enable-kaserver = BOOL
			   If this kdc should emulate the AFS kaserver.

		      check-ticket-addresses = BOOL
			   Verify the addresses in the tickets used in tgs

		      allow-null-ticket-addresses = BOOL
			   Allow address-less tickets.

		      allow-anonymous = BOOL
			   If the kdc is allowed to hand out anonymous tick‐

		      encode_as_rep_as_tgs_rep = BOOL
			   Encode as-rep as tgs-rep tobe compatible with mis‐
			   takes older DCE secd did.

		      kdc_warn_pwexpire = TIME
			   The time before expiration that the user should be
			   warned that her password is about to expire.

		      logging = Logging
			   What type of logging the kdc should use, see also

		      use_2b = {

				 principal = BOOL
				      boolean value if the 524 daemon should
				      return AFS 2b tokens for principal.



		      hdb-ldap-structural-object structural object
			   If the LDAP backend is used for storing principals,
			   this is the structural object that will be used
			   when creating and when reading objects.  The
			   default value is account .

		      hdb-ldap-create-base creation dn
			   is the dn that will be appended to the principal
			   when creating entries.  Default value is the search


		      require-preauth = BOOL
			   If pre-authentication is required to talk to the
			   kadmin server.

		      password_lifetime = time
			   If a principal already have its password set for
			   expiration, this is the time it will be valid for
			   after a change.

		      default_keys = keytypes...
			   For each entry in default_keys try to parse it as a
			   sequence of etype:salttype:salt syntax of this if
			   something like:


			   If etype is omitted it means everything, and if
			   string is omitted it means the default salt string
			   (for that principal and encryption type).  Addi‐
			   tional special values of keytypes are:

				 v5   The Kerberos 5 salt pw-salt

				 v4   The Kerberos 4 salt des:pw-salt:

		      use_v4_salt = BOOL
			   When true, this is the same as

			   default_keys = des3:pw-salt v4

			   and is only left for backwards compatibility.

		Check the Password quality assurance in the info documentation
		for more information.

		      check_library = library-name
			   Library name that contains the password check_func‐

		      check_function = function-name
			   Function name for checking passwords in

		      policy_libraries = library1 ... libraryN
			   List of libraries that can do password policy

		      policies = policy1 ... policyN
			   List of policy names to apply to the password.
			   Builtin policies are among other minimum-length,
			   character-class, external-check.

     KRB5_CONFIG points to the configuration file to read.

     /etc/krb5.conf  configuration file for Kerberos 5.

		   default_realm = FOO.SE
	   [domain_realm] = FOO.SE = FOO.SE
		   FOO.SE = {
			   kdc =
			   v4_name_convert = {
				   rcmd = host
			   v4_instance_convert = {
				   xyz =
			   default_domain =
		   kdc = FILE:/var/heimdal/kdc.log
		   kdc = SYSLOG:INFO
		   default = SYSLOG:INFO:USER

     Since krb5.conf is read and parsed by the krb5 library, there is not a
     lot of opportunities for programs to report parsing errors in any useful
     format.  To help overcome this problem, there is a program
     verify_krb5_conf that reads krb5.conf and tries to emit useful diagnos‐
     tics from parsing errors.	Note that this program does not have any way
     of knowing what options are actually used and thus cannot warn about
     unknown or misspelled ones.

     kinit(1), krb5_425_conv_principal(3), krb5_openlog(3), strftime(3),

HEIMDAL				  May 4, 2005			       HEIMDAL

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