krb5.conf(5)
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KRB5.CONF(5) NetBSD Programmer's Manual KRB5.CONF(5)
NAME
/etc/krb5.conf - configuration file for Kerberos 5
DESCRIPTION
The /etc/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:
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_lifetime = 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_principal(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/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.
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, login, and
other programs. 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.
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.
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/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 use-
ful format. To help overcome this problem, there is a program
verify_krb5_conf that reads /etc/krb5.conf and tries to emit useful diag-
nostics 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.
SEE ALSO
kinit(1), krb5_425_conv_principal(3), krb5_openlog(3), strftime(3),
verify_krb5_conf(8)
NetBSD 1.6 April 11, 1999 7
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