KDC.CONF(5) KDC.CONF(5)
NAME
kdc.conf - Kerberos V5 KDC configuration file
DESCRIPTION
kdc.conf specifies per-realm configuration data to be used by the Kerberos V5 Authentication Service
and Key Distribution Center (AS/KDC). This includes database, key and per-realm defaults.
The kdc.conf file uses the same format as the krb5.conf file. For a basic description of the syntax,
please refer to the krb5.conf description.
The following sections are currently used in the kdc.conf file:
[kdcdefaults]
Contains parameters which control the overall behaviour of the KDC.
[realms]
Contains subsections keyed by Kerberos realm names which describe per-realm KDC parameters.
KDCDEFAULTS SECTION
The following relations are defined in the [kdcdefaults] section:
kdc_ports
This relation lists the ports which the Kerberos server should listen on, by default. This
list is a comma separated list of integers. If this relation is not specified, the compiled-in compiledin
in default is usually port 88 and port 750.
v4_mode
This string specifies how the KDC should respond to Kerberos IV packets. Valid values for this
relation are the same as the valid arguments to the -4 flag to krb5kdc. If this relation is
not specified, the compiled-in default of none is used.
REALMS SECTION
Each tag in the [realms] section of the file names a Kerberos realm. The value of the tag is a sub-section subsection
section where the relations in that subsection define KDC parameters for that particular realm.
For each realm, the following tags may be specified in the [realms] subsection:
acl_file
This string specifies the location of the access control list (acl) file that kadmin uses to
determine which principals are allowed which permissions on the database. The default value is
/var/db/krb5kdc/kadm5.acl.
admin_keytab
This string Specifies the location of the keytab file that kadmin uses to authenticate to the
database. The default value is /var/db/krb5kdc/kadm5.keytab.
database_name
This string specifies the location of the Kerberos database for this realm.
default_principal_expiration
This absolute time string specifies the default expiration date of principals created in this
realm.
default_principal_flags
This flag string specifies the default attributes of principals created in this realm. The
format for the string is a comma-separated list of flags, with '+' before each flag to be
enabled and '-' before each flag to be disabled. The default is for postdateable, forward-able, forwardable,
able, tgt-based, renewable, proxiable, dup-skey, allow-tickets, and service to be enabled, and
all others to be disabled.
There are a number of possible flags:
postdateable
Enabling this flag allows the principal to obtain postdateable tickets.
forwardable
Enabling this flag allows the principal to obtain forwardable tickets.
tgt-based
Enabling this flag allows a principal to obtain tickets based on a ticket-granting-ticket, ticket-grantingticket,
ticket, rather than repeating the authentication process that was used to obtain the
TGT.
renewable
Enabling this flag allows the principal to obtain renewable tickets.
proxiable
Enabling this flag allows the principal to obtain proxy tickets.
dup-skey
Enabling this flag allows the principal to obtain a session key for another user, per-mitting permitting
mitting user-to-user authentication for this principal.
allow-tickets
Enabling this flag means that the KDC will issue tickets for this principal. Disabling
this flag essentially deactivates the principal within this realm.
preauth
If this flag is enabled on a client principal, then that principal is required to
preauthenticate to the KDC before receiving any tickets. On a service principal,
enabling this flag means that service tickets for this principal will only be issued to
clients with a TGT that has the preauthenticated ticket set.
hwauth If this flag is enabled, then the principal is required to preauthenticate using a
hardware device before receiving any tickets.
pwchange
Enabling this flag forces a password change for this principal.
service
Enabling this flag allows the the KDC to issue service tickets for this principal.
pwservice
If this flag is enabled, it marks this principal as a password change service. This
should only be used in special cases, for example, if a user's password has expired,
the user has to get tickets for that principal to be able to change it without going
through the normal password authentication.
dict_file
This string location of the dictionary file containing strings that are not allowed as pass-words. passwords.
words. If this tag is not set or if there is no policy assigned to the principal, then no
check will be done.
kadmind_port
This port number specifies the port on which the kadmind daemon is to listen for this realm.
kpasswd_port
This port number specifies the port on which the kadmind daemon is to listen for this realm.
key_stash_file
This string specifies the location where the master key has been stored with kdb5_stash.
kdc_ports
This string specifies the list of ports that the KDC is to listen to for this realm. By
default, the value of kdc_ports as specified in the [kdcdefaults] section is used.
master_key_name
This string specifies the name of the principal associated with the master key. The default
value is K/M.
master_key_type
This key type string represents the master key's key type.
max_life
This delta time string specifes the maximum time period that a ticket may be valid for in this
realm.
max_renewable_life
This delta time string specifies the maximum time period that a ticket may be renewed for in
this realm.
supported_enctypes
list of key:salt strings that specifies the default key/salt combinations of principals for
this realm
kdc_supported_enctypes
specifies the permitted key-salt combinations of principals for this realm
reject_bad_transit
this boolean specifies whether or not the list of transited realms for cross-realm tickets
should be checked against the transit path computed from the realm names and the [capaths]
section of its krb5.conf file
DATE FORMAT
For valid date format examples (both absolute time and delta time), please see the DATE FORMAT sec-tion section
tion of the kadmin manpage.
FILES
/var/db/krb5kdc/kdc.conf
SEE ALSO
krb5.conf(5), krb5kdc(8), kadmin(8)
KDC.CONF(5)
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