krb5-1.18 is released

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krb5-1.18 is released

Greg Hudson
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The MIT Kerberos Team announces the availability of MIT Kerberos 5
Release 1.18.  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 1.18
==================================

You may retrieve the Kerberos 5 Release 1.18 source from the
following URL:

        https://kerberos.org/dist/

(The distribution URL has changed from previous releases.  The same
contents are available at the old URL.)

The homepage for the krb5-1.18 release is:

        https://web.mit.edu/kerberos/krb5-1.18/

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/


DES no longer supported
=======================

Beginning with the krb5-1.18 release, single-DES encryption types are
no longer supported.


Major changes in 1.18 (2020-02-12)
==================================

Administrator experience:

* Remove support for single-DES encryption types.

* Change the replay cache format to be more efficient and robust.
  Replay cache filenames using the new format end with ".rcache2" by
  default.

* setuid programs will automatically ignore environment variables that
  normally affect krb5 API functions, even if the caller does not use
  krb5_init_secure_context().

* Add an "enforce_ok_as_delegate" krb5.conf relation to disable
  credential forwarding during GSSAPI authentication unless the KDC
  sets the ok-as-delegate bit in the service ticket.

* Use the permitted_enctypes krb5.conf setting as the default value
  for default_tkt_enctypes and default_tgs_enctypes.

Developer experience:

* Implement krb5_cc_remove_cred() for all credential cache types.

* Add the krb5_pac_get_client_info() API to get the client account
  name from a PAC.

Protocol evolution:

* Add KDC support for S4U2Self requests where the user is identified
  by X.509 certificate.  (Requires support for certificate lookup from
  a third-party KDB module.)

* Remove support for an old ("draft 9") variant of PKINIT.

* Add support for Microsoft NegoEx.  (Requires one or more third-party
  GSS modules implementing NegoEx mechanisms.)

* Honor the transited-policy-checked ticket flag on application
  servers, eliminating the requirement to configure capaths on
  servers in some scenarios.

User experience:

* Add support for "dns_canonicalize_hostname=fallback""`, causing
  host-based principal names to be tried first without DNS
  canonicalization, and again with DNS canonicalization if the
  un-canonicalized server is not found.

* Expand single-component hostnames in host-based principal names when
  DNS canonicalization is not used, adding the system's first DNS
  search path as a suffix.  Add a "qualify_shortname" krb5.conf
  relation to override this suffix or disable expansion.

Code quality:

* The libkrb5 serialization code (used to export and import krb5 GSS
  security contexts) has been simplified and made type-safe.

* The libkrb5 code for creating KRB-PRIV, KRB-SAFE, and KRB-CRED
  messages has been revised to conform to current coding practices.

* The test suite has been modified to work with macOS System Integrity
  Protection enabled.

* The test suite incorporates soft-pkcs11 so that PKINIT PKCS11
  support can always be tested.
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