Manual Reference Pages - ASETKEY (8)
asetkey - Add a key from a keytab to an AFS KeyFile
asetkey add <kvno> <keyfile> <principal>
asetkey add <kvno> <key>
asetkey delete <kvno>
The asetkey command is used to add a key to an AFS KeyFile from a
Kerberos keytab. It is similar to bos addkey except that it must be
run locally on the system where the KeyFile is located and it takes the
new key from the command line or a Kerberos 5 keytab rather than prompting
for the password.
asetkey delete can be used to delete a key (similar to bos
removekeys), and asetkey list will list the keys in a KeyFile (similar
to bos listkeys).
asetkey is used when authentication for an AFS cell is provided by a
Kerberos 5 KDC rather than kaserver. The key for the afs or
afs/cell name principal in the Kerberos 5 KDC must match the key
stored in the AFS KeyFile on all AFS database servers and file servers.
This is done by creating a keytab containing that key using the standard
Kerberos commands (generally the ktadd function of the kadmin
command) and then, on each AFS database server and file server, adding
that key to the KeyFile with asetkey add. The kvno chosen should
match the kvno in the Kerberos KDC (checked with kvno or the
getprinc function of kadmin). principal should be the name of
the AFS principal in the keytab, which must be either afs or
afs/cell name. asetkey can also be used to install a key
from a hex string.
In cells that use the Update Server to distribute the contents of the
/usr/local/etc/openafs/server directory, it is conventional to run asetkey add only
on the control machine and then let the Update Server propagate the new
KeyFile to all other systems.
AFS currently only supports des-cbc-crc:v4 Kerberos keys. Make sure, when
creating the keytab with ktadd, you pass -e des-cbc-crc:v4 to force
the encryption type. Otherwise, AFS authentication may not work.
As soon as a new keytab is created with ktadd, new AFS service tickets
will use the new key. However, tokens formed from those service tickets
will only work if the new key is present in the KeyFile on the AFS file
server. There is therefore an outage window between when the new keytab
is created and when the key had been added to the KeyFile of all AFS
servers with asetkey, during which newly obtained AFS tokens will not
All of the KeyFile entries must match the key in the Kerberos KDC, but
each time ktadd is run, it creates a new key. Either the Update Server
must be used to distribute the KeyFile to all servers or the same keytab
must be used with asetkey on each server.
The following commands create a new keytab for the principal afs and
then import the key into the KeyFile. Note the kvno in the output from
Authenticating as principal email@example.com with password.
Password for firstname.lastname@example.org:
kadmin: ktadd -k /tmp/afs.keytab -e des-cbc-crc:v4 afs
Entry for principal afs with kvno 3, encryption type DES cbc mode
with CRC-32 added to keytab WRFILE:/tmp/afs.keytab.
% asetkey add 3 /tmp/afs.keytab afs
You may want to use afs/cell name instead of afs, particularly if
you may have multiple AFS cells for a single Kerberos realm.
In the event you have been distributed a key by a Kerberos administrator
in the form of a hex string, you may use asetkey to install that.
% asetkey add 3 80b6a7cd7a9dadb6
key should be an 8 byte hex representation.
The issuer must be able to read (for asetkey list) and write (for
asetkey add and asetkey delete) the KeyFile, normally
/usr/local/etc/openafs/server/KeyFile. In practice, this means that the issuer must be
the local superuser root on the AFS file server or database server.
For asetkey add, the issuer must also be able to read the specified
Copyright 2006 Russ Allbery <email@example.com>
This documentation is covered by the IBM Public License Version 1.0. This
man page was written by Russ Allbery for OpenAFS.
|OpenAFS ||ASETKEY (8) ||2015-10-28 |
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