krb5-1.20 is released

[Greg Hudson]

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The MIT Kerberos Team announces the availability of MIT Kerberos 5
Release 1.20.  Please see below for a list of some major changes
included, or consult the README file in the source tree for a more
detailed list of significant changes.

RETRIEVING KERBEROS 5 RELEASE 1.20
==================================

You may retrieve the Kerberos 5 Release 1.20 source from the
following URL:

        https://kerberos.org/dist/

The homepage for the krb5-1.20 release is:

        https://web.mit.edu/kerberos/krb5-1.20/

Further information about Kerberos 5 may be found at the following
URL:

        https://web.mit.edu/kerberos/

and at the MIT Kerberos Consortium web site:

        https://www.kerberos.org/


PAC transition
==============

Beginning with release 1.20, the KDC will include minimal PACs in
tickets instead of AD-SIGNEDPATH authdata.  S4U requests (protocol
transition and constrained delegation) must now contain valid PACs in
the incoming tickets.  If only some KDCs in a realm have been upgraded
across version 1.20, the upgraded KDCs will reject S4U requests
containing tickets from non-upgraded KDCs and vice versa.


Triple-DES transition
=====================

Beginning with the krb5-1.19 release, a warning will be issued if
initial credentials are acquired using the des3-cbc-sha1 encryption
type.  In future releases, this encryption type will be disabled by
default and eventually removed.

Beginning with the krb5-1.18 release, single-DES encryption types have
been removed.


Major changes in 1.20 (2022-05-26)
==================================

Administrator experience:

* Added a "disable_pac" realm relation to suppress adding PAC authdata
  to tickets, for realms which do not need to support S4U requests.

* Most credential cache types will use atomic replacement when a cache
  is reinitialized using kinit or refreshed from the client keytab.

* kprop can now propagate databases with a dump size larger than 4GB,
  if both the client and server are upgraded.

* kprop can now work over NATs that change the destination IP address,
  if the client is upgraded.

Developer experience:

* Updated the KDB interface.  The sign_authdata() method is replaced
  with the issue_pac() method, allowing KDB modules to add logon info
  and other buffers to the PAC issued by the KDC.

* Host-based initiator names are better supported in the GSS krb5
  mechanism.

Protocol evolution:

* Replaced AD-SIGNEDPATH authdata with minimal PACs.

* To avoid spurious replay errors, password change requests will not
  be attempted over UDP until the attempt over TCP fails.

* PKINIT will sign its CMS messages with SHA-256 instead of SHA-1.

Code quality:

* Updated all code using OpenSSL to be compatible with OpenSSL 3.

* Reorganized the libk5crypto build system to allow the OpenSSL
  back-end to pull in material from the builtin back-end depending on
  the OpenSSL version.

* Simplified the PRNG logic to always use the platform PRNG.

* Converted the remaining Tcl tests to Python.
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