krb5.conf - configuration file for Kerberos 5
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 bindings.
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-whitespace characters.
STRINGs that are specified later in this man-page uses the
following notation.
boolean
values can be either yes/true or no/false.
time
values can be a list of year, month, day, hour,
min, second.
Example: 1 month 2 days 30 min.
etypes
valid encryption types are: des-cbc-crc, des-cbcmd4, des-cbcmd5,
des3-cbc-sha1.
address
an address can be either a IPv4 or a IPv6 address.
Currently recognised sections and bindings are:
[appdefaults]
Specifies the default values to be used for Kerberos applications.
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 credentials
forwardable.
proxiable = boolean
When obtaining initial credentials,
make the credentials
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 minutes).
kdc_timeout = time
Maximum time to wait for a reply from
the kdc, default
is 3 seconds.
v4_name_convert
v4_instance_resolve
These are described 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 desired
realm is destination-realm.
This configuration
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 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/kerberosV/krb5.keytab''.
dns_lookup_kdc = boolean
Use DNS SRV records to lookup KDC services location.
dns_lookup_realm = boolean
Use DNS TXT records to lookup domain
to realm mappings.
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 credentials
forwardable. This option is
also valid in
the [realms] section.
proxiable = boolean
When obtaining initial credentials,
make the credentials
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(8), 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
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.
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.
[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 period. 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).
[realms]
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 ``tcp''.
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 password
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 conversions.
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 performed
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 rejected.
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-
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 requests.
allow-null-ticket-addresses = BOOL
Allow address-less tickets.
allow-anonymous = BOOL
If the kdc is allowed to hand out
anonymous tickets.
encode_as_rep_as_tgs_rep = BOOL
Encode as-rep as tgs-rep tobe compatible with mistakes
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.
use_2b = principal list
List of principals to use AFS 2b tokens for.
[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):](pwsalt|afs3-salt)[:string]
If etype is omitted it means everything, and if
string is omitted it means the default
salt string
(for that principal and encryption
type). Additional
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.
KRB5_CONFIG points to the configuration file to read.
[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
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 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 misspelled ones.
kinit(1), krb5_425_conv_principal(3), krb5_openlog(3), strftime(3),
verify_krb5_conf(8)
HEIMDAL April 11, 1999
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