serves requests for tickets.
When it starts, it first checks the flags passed, any options that are
not specified with a command line flag are taken from a config file,
or from a default compiled-in value.
Specifies the location of the config file, the default is
This is the only value that can't be specified in the config file.
Turn off the requirement for pre-autentication in the initial AS-REQ
for all principals.
The use of pre-authentication makes it more difficult to do offline
You might want to turn it off if you have clients
that don't support pre-authentication.
Since the version 4 protocol doesn't support any pre-authentication,
serving version 4 clients is just about the same as not requiring
The default is to require pre-authentication.
Adding the require-preauth per principal is a more flexible way of
Gives an upper limit on the size of the requests that the kdc is
willing to handle.
Makes the kdc listen on port 80 and handle requests encapsulated in HTTP.
don't respond to 524 requests
respond to Kerberos 4 requests
respond to Kerberos 4 requests from foreign realms.
This is a known security hole and should not be enabled unless you
understand the consequences and are willing to live with them.
What realm this server should act as when dealing with version 4
The database can contain any number of realms, but since the version 4
protocol doesn't contain a realm for the server, it must be explicitly
The default is whatever is returned by
Fn krb_get_lrealm .
This option is only availabe if the KDC has been compiled with version
Enable kaserver emulation (in case it's compiled in).
Specifies the set of ports the KDC should listen on.
It is given as a
white-space separated list of services or port numbers.
--addresses= list of addresses
The list of addresses to listen for requests on.
By default, the kdc will listen on all the locally configured
If only a subset is desired, or the automatic detection fails, this
option might be used.
detach from pty and run as a daemon.
disable add des encryption types, makes the kdc not use them.
All activities are logged to one or more destinations, see
The entity used for logging is
The configuration file has the same syntax as
but will be read before
so it may override settings found there.
Options specific to the KDC only are found in the
All the command-line options can preferably be added in the
The only difference is the pre-authentication flag, which has to be
require-preauth = no
(in fact you can specify the option as
And there are some configuration options which do not have
enable-digest = boolean
turn on support for digest processing in the KDC.
The default is FALSE.
check-ticket-addresses = boolean
Check the addresses in the ticket when processing TGS requests.
The default is TRUE.
allow-null-ticket-addresses = boolean
Permit tickets with no addresses.
This option is only relevant when check-ticket-addresses is TRUE.
allow-anonymous = boolean
Permit anonymous tickets with no addresses.
max-kdc-datagram-reply-length = number
Maximum packet size the UDP rely that the KDC will transmit, instead
the KDC sends back a reply telling the client to use TCP instead.
This controls how KDC requests with the
flag are handled. It can be one of:
Always check transited encoding, this is the default.
Currently this is identical to
In a future release, it will be possible to mark a principal as able
to handle unchecked requests.
Always do what the client asked.
In a future release, it will be possible to force a check per
encode_as_rep_as_tgs_rep = boolean
Encode AS-Rep as TGS-Rep to be bug-compatible with old DCE code.
The Heimdal clients allow both.
kdc_warn_pwexpire = time
How long before password/principal expiration the KDC should start
sending out warning messages.
The configuration file is only read when the
If changes made to the configuration file are to take effect, the
needs to be restarted.
An example of a config file:
require-preauth = no
v4-realm = FOO.SE
If the machine running the KDC has new addresses added to it, the KDC
will have to be restarted to listen to them.
The reason it doesn't just listen to wildcarded (like INADDR_ANY)
addresses, is that the replies has to come from the same address they
were sent to, and most OS:es doesn't pass this information to the
If your normal mode of operation require that you add and remove
addresses, the best option is probably to listen to a wildcarded TCP
socket, and make sure your clients use TCP to connect.
For instance, this will listen to IPv4 TCP port 88 only:
kdc --addresses=0.0.0.0 --ports="88/tcp"
There should be a way to specify protocol, port, and address triplets,
not just addresses and protocol, port tuples.