In the gak_data value used by krb5_get_as_key_password, separate the
already-known password from the storage we might have allocated to put
it in, so that we no longer use an empty data buffer to determine
whether we know the password.  This allows empty passwords to work via
the API.

Remove the kadm5 test which explicitly uses an empty password.

Based on a patch from Stef Walter.

ticket: 7642

kadm5_create_policy and kadm5_modify_policy had _internal variants in
libkadm5srv (but not libkadm5clnt) which only existed to protect the
policy_refcnt field from modification over the wire.  Now that
policy_refcnt is no longer used, we don't need the separation.

Bump the library soname since this is technically an ABI change.

Stop using and maintaining the policy_refcnt field, and do not try to
prevent deletion of a policy which is still referenced by principals.
Instead, allow principals to refer to policy names which do not exist
as policy objects; treat those principals as having no associated
policy.

In the kadmin client, warn if addprinc or modprinc tries to reference
a policy which doesn't exist, since the server will no longer error
out in this case.

ticket: 7385

Make gssrpc work over IPv6 TCP sockets provided that the client
creates and connects/binds the sockets and doesn't query their
addresses or use bindresvport().  Make kadmin work within those
constraints and handle IPv6.  Specific changes:

* Make svctcp_create() able to extract the port from an IPv6 socket,
  using a new helper function getport().
* Make clnttcp_create() handle a null raddr value if *sockp is set.
* Make kadm5_get_service_name() use getaddrinfo() to canonicalize the
  admin server name.
* Make libkadm5clnt's init_any() responsible for connecting its socket
  using a new helper function connect_to_server(), which uses
  getaddrinfo instead of gethostbyname.  Pass a null address to
  clnttcp_create().
* Make libapputil's net-server.c set up IPv6 as well as IPv4 listener
  ports for RPC connections.
* Adjust the error code expected in a libkadm5 unit test.

ticket: 6746

git-svn-id: svn://anonsvn.mit.edu/krb5/trunk@24147 dc483132-0cff-0310-8789-dd5450dbe970

Create kadmin/history lazily when we need it (i.e. when a password is
changed on a principal with a policy) instead of whenever we open the
database.  Allows kadmin.local to be used as a read-only tool on non-
kadmin-conformant database back ends such as the Samba bridge.

ticket: 6679

git-svn-id: svn://anonsvn.mit.edu/krb5/trunk@23799 dc483132-0cff-0310-8789-dd5450dbe970

* localhostname from get_hostname was unused.
* database_name is no longer used except (misleadingly) in kdb5_util
  output.
* admin_database_name and admin_database_lockfile are no longer used.
* default_domain is only used for v4->v5 principal conversion, which
  isn't tested.
* libkadm5's init-v2.exp had a copy of get_hostname; domain and
  localhostname from it were unused.

git-svn-id: svn://anonsvn.mit.edu/krb5/trunk@23759 dc483132-0cff-0310-8789-dd5450dbe970

Add minimal support for re-randomizing the history key:

* cpw -randkey kadmin/history now works, but creates only one key.
* cpw -randkey -keepold kadmin/history still fails.
* libkadm5 no longer caches the history key.  Performance impact
  is minimal since password changes are not common.
* randkey no longer checks the newly randomized key against old keys,
  and the disabled code to do so in setkey/setv4key is gone, so now
  only kadm5_chpass_principal_3 accesses the password history.

ticket: 6660
target_version: 1.8
tags: pullup

git-svn-id: svn://anonsvn.mit.edu/krb5/trunk@23716 dc483132-0cff-0310-8789-dd5450dbe970

main body of tests won't have to be moved every time the current API
version of libkadm5 changes.

git-svn-id: svn://anonsvn.mit.edu/krb5/trunk@23087 dc483132-0cff-0310-8789-dd5450dbe970