Kerberos Version 5, Release 1.17
Release Notes
The MIT Kerberos Team
Copyright and Other Notices
---------------------------
Copyright (C) 1985-2019 by the Massachusetts Institute of Technology
and its contributors. All rights reserved.
Please see the file named NOTICE for additional notices.
Documentation
-------------
Unified documentation for Kerberos V5 is available in both HTML and
PDF formats. The table of contents of the HTML format documentation
is at doc/html/index.html, and the PDF format documentation is in the
doc/pdf directory.
Additionally, you may find copies of the HTML format documentation
online at
http://web.mit.edu/kerberos/krb5-latest/doc/
for the most recent supported release, or at
http://web.mit.edu/kerberos/krb5-devel/doc/
for the release under development.
More information about Kerberos may be found at
http://web.mit.edu/kerberos/
and at the MIT Kerberos Consortium web site
http://kerberos.org/
Building and Installing Kerberos 5
----------------------------------
Build documentation is in doc/html/build/index.html or
doc/pdf/build.pdf.
The installation guide is in doc/html/admin/install.html or
doc/pdf/install.pdf.
If you are attempting to build under Windows, please see the
src/windows/README file.
Reporting Bugs
--------------
Please report any problems/bugs/comments by sending email to
krb5-bugs@mit.edu.
You may view bug reports by visiting
http://krbdev.mit.edu/rt/
and using the "Guest Login" button. Please note that the web
interface to our bug database is read-only for guests, and the primary
way to interact with our bug database is via email.
DES transition
--------------
The Data Encryption Standard (DES) is widely recognized as weak. The
krb5-1.7 release contains measures to encourage sites to migrate away
from using single-DES cryptosystems. Among these is a configuration
variable that enables "weak" enctypes, which defaults to "false"
beginning with krb5-1.8.
Major changes in 1.17 (2019-01-08)
----------------------------------
Administrator experience:
* A new Kerberos database module using the Lightning Memory-Mapped
Database library (LMDB) has been added. The LMDB KDB module should
be more performant and more robust than the DB2 module, and may
become the default module for new databases in a future release.
* "kdb5_util dump" will no longer dump policy entries when specific
principal names are requested.
Developer experience:
* The new krb5_get_etype_info() API can be used to retrieve enctype,
salt, and string-to-key parameters from the KDC for a client
principal.
* The new GSS_KRB5_NT_ENTERPRISE_NAME name type allows enterprise
principal names to be used with GSS-API functions.
* KDC and kadmind modules which call com_err() will now write to the
log file in a format more consistent with other log messages.
* Programs which use large numbers of memory credential caches should
perform better.
Protocol evolution:
* The SPAKE pre-authentication mechanism is now supported. This
mechanism protects against password dictionary attacks without
requiring any additional infrastructure such as certificates. SPAKE
is enabled by default on clients, but must be manually enabled on
the KDC for this release.
* PKINIT freshness tokens are now supported. Freshness tokens can
protect against scenarios where an attacker uses temporary access to
a smart card to generate authentication requests for the future.
* Password change operations now prefer TCP over UDP, to avoid
spurious error messages about replays when a response packet is
dropped.
* The KDC now supports cross-realm S4U2Self requests when used with a
third-party KDB module such as Samba's. The client code for
cross-realm S4U2Self requests is also now more robust.
User experience:
* The new ktutil addent -f flag can be used to fetch salt information
from the KDC for password-based keys.
* The new kdestroy -p option can be used to destroy a credential cache
within a collection by client principal name.
* The Kerberos man page has been restored, and documents the
environment variables that affect programs using the Kerberos
library.
Code quality:
* Python test scripts now use Python 3.
* Python test scripts now display markers in verbose output, making it
easier to find where a failure occurred within the scripts.
* The Windows build system has been simplified and updated to work
with more recent versions of Visual Studio. A large volume of
unused Windows-specific code has been removed. Visual Studio 2013
or later is now required.
krb5-1.17 changes by ticket ID
------------------------------
7905 Password changes can result in replay error
8202 memory ccache cursors are invalidated by initialize
8270 No logging when a non-root ksu with command fails authorization
8587 ktutil addent should be able to fetch etype-info2 for principal
8629 etype-info not included in hint list for REQUIRES_HW_AUTH principals
8630 Logging from KDC/kadmind plugin modules
8634 Trace log on k5tls load failure
8635 Fix a few German translation prepositions
8636 PKINIT certid option cannot handle leading zero
8641 Make public headers work with gcc -Wundef
8642 etype-info conflated for initial, final reply key enctype
8647 Add SPAKE preauth support
8648 Implement PKINIT freshness tokens
8650 Exit with status 0 from kadmind
8651 profile library may try to reread from special device files
8652 Report extended errors in kinit -k -t KDB:
8653 Include preauth name in trace output if possible
8654 Prevent fallback from SPAKE to encrypted timestamp
8655 Need per-realm client configuration to deny encrypted timestamp
8657 SPAKE support for Windows build
8659 SPAKE client asks for password before checking second-factor support
8661 ksu segfaults when argc == 0
8662 Windows README does not document MFC requirement
8663 TLS is not free on library unload
8664 Avoid simultaneous KDB/ulog locks in ulog_replay
8665 Display more extended errors in kdb5_util
8673 Improve error for kadmind -proponly without iprop
8674 Add LMDB KDB module
8677 Escape curly braces in def-check.pl regexes
8678 Don't specify MFC library in Leash build
8679 Fix Leash build error with recent Visual Studio
8680 Update kfw installer for VS2017, WiX 3.11.1
8682 Stop building CNS for Windows
8684 Fix option parsing on Windows
8685 Make plugin auto-registration work on Windows
8686 Process profile includedir in sorted order
8687 Repeated lookups of local computer name on Windows
8689 t_path.c build failure with NDEBUG
8690 Fix Windows strerror_r() implementation
8691 Use pkg.m4 macros
8692 Make docs build python3-compatible
8693 Resource leak in domain_fallback_realm()
8694 Add documentation on dictionary attacks
8695 Resource leak in krb5_524_conv_principal()
8696 Resource leak in krb5_425_conv_principal()
8697 Resource leak in krb5_gss_inquire_cred()
8698 Resource leak in aname_replacer()
8699 Resource leak in k5_os_hostaddr()
8700 Resource leak in krb5int_get_fq_local_hostname()
8702 Resource leak in kdb5_purge_mkeys()
8703 Resource leak in RPC UDP cache code
8704 Resource leak in read_secret_file()
8707 Resource leak in ulog_map()
8708 Incorrect error handling in OTP plugin
8709 Explicitly look for python2 in configure.in
8710 Convert Python tests to Python 3
8711 Use SHA-256 instead of MD5 for audit ticket IDs
8713 Zap copy of secret in RC4 string-to-key
8715 Make krb5kdc -p affect TCP ports
8716 Remove outdated note in krb5kdc man page
8718 krb5_get_credentials incorrectly matches user to user ticket
8719 Extend gss-sample timeout from 10s to 300s
8720 Don't include all MEMORY ccaches in collection
8721 Don't tag S4U2Proxy result creds as user-to-user
8722 Use a hash table for MEMORY ccache resolution
8723 Use PTHREAD_CFLAGS when testing for getpwnam_r()
8724 Add kdestroy -p option
8725 Update many documentation links to https
8726 Null deref on some invalid PKINIT identities
8727 Check strdup return in kadm5_get_config_params()
8728 doc: kswitch manual "see also" subsection typo
8729 Memory leak in gss_add_cred() creation case
8730 Add kvno option for user-to-user
8731 Document that DESTDIR must be an absolute path
8732 Fix name of .pdb file in ccapi/test/Makefile.in
8733 Multiple pkinit_identities semantics are unclear and perhaps not useful
8734 gss_add_cred() aliases memory when creating extended cred
8736 Check mech cred in gss_inquire_cred_by_mech()
8737 gss_add_cred() ignores desired_name if creating a new credential
8738 Use the term "replica KDC" in source and docs
8741 S4U2Self client code fails with no default realm
8742 Use "replica" in iprop settings
8743 Fix incorrect TRACE usages to use {str}
8744 KDC/kadmind may not follow master key change before purge_mkeys
8745 libss without readline can interfere with reading passwords
8746 Fix 64-bit Windows socket write error handling
8747 Allow referrals for cross-realm S4U2Self requests
8748 Add more constraints to S4U2Self processing
8749 Add PAC APIs which can include a client realm
8750 Resource leak in ktutil_add()
8751 Fix up kdb5_util documentation
8752 Don't dump policies if principals are specified
8753 Prevent SIGPIPE from socket writes on UNIX-likes
8754 Correct kpasswd_server description in krb5.conf(5)
8755 Bring back general kerberos man page
8756 Add GSS_KRB5_NT_ENTERPRISE_NAME name type
8757 Start S4U2Self realm lookup at server realm
8759 Resource leak in kadm5_randkey_principal_3()
8760 Retry KCM writes once on remote hangup
8762 Fix spelling of auth_to_local example
8763 Ignore password attributes for S4U2Self requests
8767 Remove incorrect KDC assertion
8768 Fix double-close in ksu get_authorized_princ_names
8769 Fix build issues with Solaris native compiler
Acknowledgements
----------------
Past Sponsors of the MIT Kerberos Consortium:
Apple
Carnegie Mellon University
Centrify Corporation
Columbia University
Cornell University
The Department of Defense of the United States of America (DoD)
Fidelity Investments
Google
Iowa State University
MIT
Michigan State University
Microsoft
MITRE Corporation
Morgan-Stanley
The National Aeronautics and Space Administration
of the United States of America (NASA)
Network Appliance (NetApp)
Nippon Telephone and Telegraph (NTT)
US Government Office of the National Coordinator for Health
Information Technology (ONC)
Oracle
Pennsylvania State University
Red Hat
Stanford University
TeamF1, Inc.
The University of Alaska
The University of Michigan
The University of Pennsylvania
Past and present members of the Kerberos Team at MIT:
Danilo Almeida
Jeffrey Altman
Justin Anderson
Richard Basch
Mitch Berger
Jay Berkenbilt
Andrew Boardman
Bill Bryant
Steve Buckley
Joe Calzaretta
John Carr
Mark Colan
Don Davis
Sarah Day
Alexandra Ellwood
Carlos Garay
Dan Geer
Nancy Gilman
Matt Hancher
Thomas Hardjono
Sam Hartman
Paul Hill
Marc Horowitz
Eva Jacobus
Miroslav Jurisic
Barry Jaspan
Benjamin Kaduk
Geoffrey King
Kevin Koch
John Kohl
HaoQi Li
Jonathan Lin
Peter Litwack
Scott McGuire
Steve Miller
Kevin Mitchell
Cliff Neuman
Paul Park
Ezra Peisach
Chris Provenzano
Ken Raeburn
Jon Rochlis
Jeff Schiller
Jen Selby
Robert Silk
Bill Sommerfeld
Jennifer Steiner
Ralph Swick
Brad Thompson
Harry Tsai
Zhanna Tsitkova
Ted Ts'o
Marshall Vale
Taylor Yu
The following external contributors have provided code, patches, bug
reports, suggestions, and valuable resources:
Ian Abbott
Brandon Allbery
Russell Allbery
Brian Almeida
Michael B Allen
Pooja Anil
Heinz-Ado Arnolds
Derek Atkins
Mark Bannister
David Bantz
Alex Baule
David Benjamin
Thomas Bernard
Adam Bernstein
Arlene Berry
Jeff Blaine
Radoslav Bodo
Sumit Bose
Emmanuel Bouillon
Isaac Boukris
Philip Brown
Samuel Cabrero
Michael Calmer
Andrea Campi
Julien Chaffraix
Puran Chand
Ravi Channavajhala
Srinivas Cheruku
Leonardo Chiquitto
Seemant Choudhary
Howard Chu
Andrea Cirulli
Christopher D. Clausen
Kevin Coffman
Simon Cooper
Sylvain Cortes
Ian Crowther
Arran Cudbard-Bell
Jeff D'Angelo
Nalin Dahyabhai
Mark Davies
Dennis Davis
Alex Dehnert
Mark Deneen
Günther Deschner
John Devitofranceschi
Marc Dionne
Roland Dowdeswell
Dorian Ducournau
Viktor Dukhovni
Jason Edgecombe
Mark Eichin
Shawn M. Emery
Douglas E. Engert
Peter Eriksson
Juha Erkkilä
Gilles Espinasse
Ronni Feldt
Bill Fellows
JC Ferguson
Remi Ferrand
Paul Fertser
Fabiano Fidêncio
William Fiveash
Jacques Florent
Ákos Frohner
Sebastian Galiano
Marcus Granado
Dylan Gray
Scott Grizzard
Helmut Grohne
Steve Grubb
Philip Guenther
Timo Gurr
Dominic Hargreaves
Robbie Harwood
John Hascall
Jakob Haufe
Matthieu Hautreux
Jochen Hein
Paul B. Henson
Jeff Hodges
Christopher Hogan
Love Hörnquist Åstrand
Ken Hornstein
Henry B. Hotz
Luke Howard
Jakub Hrozek
Shumon Huque
Jeffrey Hutzelman
Sergey Ilinykh
Wyllys Ingersoll
Holger Isenberg
Spencer Jackson
Diogenes S. Jesus
Pavel Jindra
Brian Johannesmeyer
Joel Johnson
Alexander Karaivanov
Anders Kaseorg
Bar Katz
Zentaro Kavanagh
Mubashir Kazia
W. Trevor King
Patrik Kis
Martin Kittel
Matthew Krupcale
Mikkel Kruse
Reinhard Kugler
Tomas Kuthan
Pierre Labastie
Chris Leick
Volker Lendecke
Jan iankko Lieskovsky
Todd Lipcon
Oliver Loch
Chris Long
Kevin Longfellow
Frank Lonigro
Jon Looney
Nuno Lopes
Todd Lubin
Ryan Lynch
Roland Mainz
Sorin Manolache
Andrei Maslennikov
Michael Mattioli
Nathaniel McCallum
Greg McClement
Cameron Meadors
Alexey Melnikov
Franklyn Mendez
Markus Moeller
Kyle Moffett
Paul Moore
Keiichi Mori
Michael Morony
Zbysek Mraz
Edward Murrell
Nikos Nikoleris
Felipe Ortega
Michael Osipov
Andrej Ota
Dmitri Pal
Javier Palacios
Tom Parker
Ezra Peisach
Alejandro Perez
Zoran Pericic
W. Michael Petullo
Mark Phalan
Sharwan Ram
Brett Randall
Jonathan Reams
Jonathan Reed
Robert Relyea
Tony Reix
Martin Rex
Pat Riehecky
Jason Rogers
Matt Rogers
Nate Rosenblum
Solly Ross
Mike Roszkowski
Guillaume Rousse
Joshua Schaeffer
Andreas Schneider
Paul Seyfert
Tom Shaw
Jim Shi
Peter Shoults
Richard Silverman
Cel Skeggs
Simo Sorce
Michael Spang
Michael Ströder
Bjørn Tore Sund
Joe Travaglini
Tim Uglow
Rathor Vipin
Denis Vlasenko
Jorgen Wahlsten
Stef Walter
Max (Weijun) Wang
John Washington
Stef Walter
Xi Wang
Nehal J Wani
Kevin Wasserman
Margaret Wasserman
Marcus Watts
Andreas Wiese
Simon Wilkinson
Nicolas Williams
Ross Wilper
Augustin Wolf
David Woodhouse
Tsu-Phong Wu
Xu Qiang
Neng Xue
Zhaomo Yang
Nickolai Zeldovich
Bean Zhang
Hanz van Zijst
Gertjan Zwartjes
The above is not an exhaustive list; many others have contributed in
various ways to the MIT Kerberos development effort over the years.
Other acknowledgments (for bug reports and patches) are in the
doc/CHANGES file.