KRB5.CONF(5)              OpenBSD Programmer's Manual             KRB5.CONF(5)

NAME
     /etc/kerberosV/krb5.conf - configuration file for Kerberos 5

DESCRIPTION
     The /etc/kerberosV/krb5.conf file specifies several configuration parame-
     ters 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:

           file:
                   /* empty */
                   sections

           sections:
                   section sections
                   section

           section:
                   '[' section_name ']' bindings

           section_name:
                   STRING

           bindings:
                   binding bindings
                   binding

           binding:
                   name '=' STRING
                   name '=' '{' bindings '}'

           name:
                   STRING

     STRINGs consists of one or more non-white space characters.  Currently
     recognised sections and bindings are:

           [appdefaults]
                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_life = time
                           Default ticket lifetime.

                      renew_lifetime = time
                           Default renewable ticket lifetime.

           [libdefaults]

                      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-
                           utes).

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

                      v4_name_convert

                      v4_instance_resolve
                           These are decribed in the krb5_425_conv_princi-
                           pal(3) manual page.

                      capath = {

                                 destination-realm = next-hop-realm

                                 ...
                           Normally, all requests to realms different from the
                           one of the current client are sent to this KDC to
                           get cross-realm tickets.  If this KDC does not have
                           a cross-realm key with the desired realm and the
                           hierarchical path to that realm does not work, a
                           path can be configured using this directive.  The
                           text shown above instructs the KDC to try to obtain
                           a cross-realm ticket to next-hop-realm when the de-
                           sired realm is destination-realm. This configura-
                           tion should preferably be done on the KDC where it
                           will help all its clients but can also be done on
                           the client itself.

                      }

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

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

                      default_keytab_name = keytab
                           The keytab to use if none other is specified, de-
                           fault is ``FILE:/etc/kerberosV/krb5.keytab''.

                      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.

                      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
                           Enable to make a failure to verify obtained creden-
                           tials non-fatal. This can be useful if there is no
                           keytab on a host.

                      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
                           HTTP.

                      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.

                      srv_lookup = boolean
                           Use DNS SRV records to lookup realm configuration
                           information.

                      srv_try_txt = boolean
                           If a SRV lookup fails, try looking up the same info
                           in a DNS TXT record.

                      scan_interfaces = boolean
                           Scan all network interfaces for addresses, as op-
                           posed 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 and other pro-
                           grams.  This option is also valid in the [realms]
                           section.

           [domain_realm]
                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 perid.

           [realms]

                      REALM = {

                                 kdc = host[:port]
                                      Specifies a list of kdcs for this realm.
                                      If the optional port is absent, the de-
                                      fault value for the ``kerberos/udp''
                                      service will be used.  The kdcs will be
                                      used in the order that they are speci-
                                      fied.

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

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

                                 v4_instance_convert

                                 v4_name_convert

                                 default_domain
                                      See krb5_425_conv_principal(3).

                      }

           [logging]

                      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.

           [kdc]

                      database = {

                                 dbname = DATABASENAME


                                      use this database for this realm.

                                 realm = REALM
                                      specifies the realm that will be stored
                                      in this database.

                                 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
                                      database.

                                 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 re-
                           jected.

                      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 kerberos4 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 same as enable-kerberos4.

                      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 re-
                           quests.

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

                      allow-anonymous = BOOL
                           if the kdc is allowed to hand out anonymous tick-
                           ets.

                      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
                           [logging]/kdc.

           [kadmin]

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

                      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:

                           [(des|des3|etype):](pw-salt|afs3-salt)[:string]

                           if etype is omitted it means everything, and if
                           string is omitted is means the default string (for
                           that principal). Additional special values of keyt-
                           types are:

                                 v5   The kerberos 5 salt pw-salt

                                 v4   The kerberos 4 type 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 compatability.

ENVIRONMENT
     KRB5_CONFIG points to the configuration file to read.

EXAMPLE
           [libdefaults]
                   default_realm = FOO.SE
           [domain_realm]
                   .foo.se = FOO.SE
                   .bar.se = FOO.SE
           [realms]
                   FOO.SE = {
                           kdc = kerberos.foo.se
                           v4_name_convert = {
                                   rcmd = host
                           }
                           v4_instance_convert = {
                                   xyz = xyz.bar.se
                           }
                           default_domain = foo.se
                   }
           [logging]
                   kdc = FILE:/var/heimdal/kdc.log
                   kdc = SYSLOG:INFO
                   default = SYSLOG:INFO:USER

DIAGNOSTICS
     Since /etc/kerberosV/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 /etc/kerberosV/krb5.conf and tries to emit
     useful diagnostics 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 misspelt ones.

SEE ALSO
     verify_krb5_conf(8), krb5_openlog(3), krb5_425_conv_principal(3),
     strftime(3), kinit(1)

 HEIMDAL                        April 11, 1999                               7
