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heimdal-kadmin - Man Page

Kerberos administration utility


kadmin[-p string | --principal=string] [-K string | --keytab=string] [-c file | --config-file=file] [-k file | --key-file=file] [-r realm | --realm=realm] [-a host | --admin-server=host] [-s port number | --server-port=port number] [-l | --local] [-h | --help] [-v | --version] [command]


The kadmin program is used to make modifications to the Kerberos database, either remotely via the kadmind(8) daemon, or locally (with the -l option).

Supported options:

-p string, --principal=string

principal to authenticate as

-K string, --keytab=string

keytab for authentication principal

-c file, --config-file=file

location of config file

-k file, --key-file=file

location of master key file

-r realm, --realm=realm

realm to use

-a host, --admin-server=host

server to contact

-s port number, --server-port=port number

port to use

-l, --local

local admin mode

If no command is given on the command line, kadmin will prompt for commands to process. Some of the commands that take one or more principals as argument (delete, ext_keytab, get, modify, and passwd) will accept a glob style wildcard, and perform the operation on all matching principals.

Commands include:

add [-r | --random-key] [--random-password] [-p string | --password=string] [--key=string] [--max-ticket-life=lifetime] [--max-renewable-life=lifetime] [--attributes=attributes] [--expiration-time=time] [--pw-expiration-time=time] [--policy=policy-name] principal...

Adds a new principal to the database. The options not passed on the command line will be promped for. The only policy supported by Heimdal servers is ‘default’.

add_enctype [-r | --random-key] principal enctypes...

Adds a new encryption type to the principal, only random key are supported.

delete principal...

Removes a principal.

del_enctype principal enctypes...

Removes some enctypes from a principal; this can be useful if the service belonging to the principal is known to not handle certain enctypes.

ext_keytab [-k string | --keytab=string] principal...

Creates a keytab with the keys of the specified principals. Requires get-keys rights, otherwise the principal's keys are changed and saved in the keytab.

get [-l | --long] [-s | --short] [-t | --terse] [-o string | --column-info=string] principal...

Lists the matching principals, short prints the result as a table, while long format produces a more verbose output. Which columns to print can be selected with the -o option. The argument is a comma separated list of column names optionally appended with an equal sign (‘=’) and a column header. Which columns are printed by default differ slightly between short and long output.

The default terse output format is similar to -s -o principal=, just printing the names of matched principals.

Possible column names include: principal, princ_expire_time, pw_expiration, last_pwd_change, max_life, max_rlife, mod_time, mod_name, attributes, kvno, mkvno, last_success, last_failed, fail_auth_count, policy, and keytypes.

modify [-a attributes | --attributes=attributes] [--max-ticket-life=lifetime] [--max-renewable-life=lifetime] [--expiration-time=time] [--pw-expiration-time=time] [--kvno=number] [--policy=policy-name] principal...

Modifies certain attributes of a principal. If run without command line options, you will be prompted. With command line options, it will only change the ones specified.

Only policy supported by Heimdal is ‘default’.

Possible attributes are: new-princ, support-desmd5, pwchange-service, disallow-svr, requires-pw-change, requires-hw-auth, requires-pre-auth, disallow-all-tix, disallow-dup-skey, disallow-proxiable, disallow-renewable, disallow-tgt-based, disallow-forwardable, disallow-postdated

Attributes may be negated with a "-", e.g.,

kadmin -l modify -a -disallow-proxiable user

passwd [--keepold] [-r | --random-key] [--random-password] [-p string | --password=string] [--key=string] principal...

Changes the password of an existing principal.

verify-password-quality principal password

Run the password quality check function locally. You can run this on the host that is configured to run the kadmind process to verify that your configuration file is correct. The verification is done locally, if kadmin is run in remote mode, no rpc call is done to the server. NOTE: if the environment has verify-password-quality configured to use a back-end that stores password history (such as heimdal-history), running verify-quality-password will cause an update to the password database meaning that merely verifying the quality of the password using verify-quality-password invalidates the use of that principal/password in the future.


Lists the operations you are allowed to perform. These include add, add_enctype, change-password, delete, del_enctype, get, get-keys, list, and modify.

rename from to

Renames a principal. This is normally transparent, but since keys are salted with the principal name, they will have a non-standard salt, and clients which are unable to cope with this will fail. Kerberos 4 suffers from this.

check [realm]

Check database for strange configurations on important principals. If no realm is given, the default realm is used.

When running in local mode, the following commands can also be used:

dump [-d | --decrypt] [-fformat | --format=format] [dump-file]

Writes the database in “machine readable text” form to the specified file, or standard out. If the database is encrypted, the dump will also have encrypted keys, unless --decrypt is used. If --format=MIT is used then the dump will be in MIT format. Otherwise it will be in Heimdal format.

init [--realm-max-ticket-life=string] [--realm-max-renewable-life=string] realm

Initializes the Kerberos database with entries for a new realm. It's possible to have more than one realm served by one server.

load file

Reads a previously dumped database, and re-creates that database from scratch.

merge file

Similar to load but just modifies the database with the entries in the dump file.

stash [-e enctype | --enctype=enctype] [-k keyfile | --key-file=keyfile] [--convert-file] [--master-key-fd=fd]

Writes the Kerberos master key to a file used by the KDC.

See Also

kadmind(8), kdc(8)


February 22, 2007