host kerberos keyfile (srvtab) manipulation utility

allows a system manager to list or change keys currently in his keyfile or to add new keys to the keyfile.

Operation must be one of the following:

list

lists the keys in a keyfile showing version number and principal name. If the -k option is given, keys will also be shown.

change

changes all the keys in the keyfile by using the regular admin protocol. If the -i flag is given, ksrvutil will prompt for yes or no before changing each key. If the -k option is used, the old and new keys will be displayed.

add

allows the user to add a key. add prompts for name, instance, realm, and key version number, asks for confirmation, and then asks for a password. then converts the password to a key and appends the keyfile with the new information. If the -k option is used, the key is displayed.

get

gets a service from the Kerberos server, possibly creating the principal. Names, instances and realms for the service keys to get are prompted for. The default principal used in the kadmin transcation is your root instance. This can be changed with the -p option.

delete

removes a key.

In all cases, the default file used is KEY_FILE as defined in krb.h unless this is overridden by the -f option.

A good use for would be for adding keys to a keyfile. A system manager could ask a kerberos administrator to create a new service key with kadmin() and could supply an initial password. Then, he could use to add the key to the keyfile and then to change the key so that it will be random and unknown to either the system manager or the kerberos administrator.

always makes a backup copy of the keyfile before making any changes.

If should exit on an error condition at any time during a change or add, a copy of the original keyfile can be found in filename Ns .old where filename is the name of the keyfile, and a copy of the file with all new keys changed or added so far can be found in filename Ns .work. The original keyfile is left unmodified until the program exits at which point it is removed and replaced it with the workfile. Appending the workfile to the backup copy and replacing the keyfile with the result should always give a usable keyfile, although the resulting keyfile will have some out of date keys in it.

Emanuel Jay Berkenbilt, MIT Project Athena