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README

Kerberos Version 5, Release 1.15

Release Notes
                        The MIT Kerberos Team

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 1.15.1 (2017-03-01)
------------------------------------

This is a bug fix release.

* Allow KDB modules to determine how the e_data field of principal
  fields is freed

* Fix udp_preference_limit when the KDC location is configured with
  SRV records

* Fix KDC and kadmind startup on some IPv4-only systems

* Fix the processing of PKINIT certificate matching rules which have
  two components and no explicit relation

* Improve documentation

krb5-1.15.1 changes by ticket ID
--------------------------------

7940    PKINIT docs only work for one-component client principals
8523    Add krbPwdPolicy attributes to kerberos.ldif
8524    Add caveats to krbtgt change documentation
8525    Fix error handling in PKINIT decode_data()
8530    KDC/kadmind explicit wildcard listener addresses do not use pktinfo
8531    KDC/kadmind may fail to start on IPv4-only systems
8532    Fix GSSAPI authind attribute name in docs
8538    Need a way to free KDB module e_data
8540    Document default realm and login authorization
8552    Add GSSAPI S4U documentation
8553    Fix PKINIT two-component matching rule parsing
8554    udp_preference_limit fails with SRV records

Major changes in 1.15 (2016-12-01)
----------------------------------

Administrator experience:

* Improve support for multihomed Kerberos servers by adding options
  for specifying restricted listening addresses for the KDC and
  kadmind.

* Add support to kadmin for remote extraction of current keys without
  changing them (requires a special kadmin permission that is excluded
  from the wildcard permission), with the exception of highly
  protected keys.

* Add a lockdown_keys principal attribute to prevent retrieval of the
  principal's keys (old or new) via the kadmin protocol.  In newly
  created databases, this attribute is set on the krbtgt and kadmin
  principals.

* Restore recursive dump capability for DB2 back end, so sites can
  more easily recover from database corruption resulting from power
  failure events.

* Add DNS auto-discovery of KDC and kpasswd servers from URI records,
 in addition to SRV records.  URI records can convey TCP and UDP
 servers and master KDC status in a single DNS lookup, and can also
 point to HTTPS proxy servers.

* Add support for password history to the LDAP back end.

* Add support for principal renaming to the LDAP back end.

* Use the getrandom system call on supported Linux kernels to avoid
  blocking problems when getting entropy from the operating system.

* In the PKINIT client, use the correct DigestInfo encoding for PKCS
  #1 signatures, so that some especially strict smart cards will work.

Code quality:

* Clean up numerous compilation warnings.

* Remove various infrequently built modules, including some preauth
  modules that were not built by default.

Developer experience:

* Add support for building with OpenSSL 1.1.

* Use SHA-256 instead of MD5 for (non-cryptographic) hashing of
  authenticators in the replay cache.  This helps sites that must
  build with FIPS 140 conformant libraries that lack MD5.

* Eliminate util/reconf and allow the use of autoreconf alone to
  regenerate the configure script.

Protocol evolution:

* Add support for the AES-SHA2 enctypes, which allows sites to conform
  to Suite B crypto requirements.

krb5-1.15 changes by ticket ID
------------------------------

1093    KDC could use feature to limit listening interfaces
5889    password history doesn't work with LDAP KDB
6666    some non-default plugin directories don't build in 1.8 branch
7852    kadmin.local's ktadd -norandkey does not handle multiple kvnos
        in the KDB
7985    Add krb5_get_init_creds_opt_set_pac_request
8065    Renaming principals with LDAP KDB deletes the principal
8277    iprop can choose wrong realm
8278    Add krb5_expand_hostname() API
8280    Fix impersonate_name to work with interposers
8295    kdb5_ldap_stash_service_password() stash file logic needs tweaking
8297    jsonwalker.py test fails
8298    Audit Test fails when system has IPV6 address
8299    Remove util/reconf
8329    Only run export-check.pl in maintainer mode
8344    Create KDC and kadmind log files with mode 0640
8345    Remove nss libk5crypto implementation
8348    Remove workaround when binding to udp addresses and pktinfo
        isn't supported by the system
8353    Replace MD5 use in rcache with SHA-256
8354    Only store latest keys in key history entry
8355    Add kadm5_setkey_principal_4 RPC to kadmin
8364    Add get_principal_keys RPC to kadmin
8365    Add the ability to lock down principal keys
8366    Increase initial DNS buffer size
8368    Remove hdb KDB module
8371    Improve libkadm5 client RPC thread safety
8372    Use cached S4U2Proxy tickets in GSSAPI
8374    Interoperate with incomplete SPNEGO responses
8375    Allow zero cksumtype in krb5_k_verify_checksum()
8379    Add auth indicator handling to libkdb_ldap
8381    Don't fall back to master on password read error
8386    Add KDC pre-send and post-receive KDC hooks
8388    Remove port 750 from the KDC default ports
8389    Make profile includedir accept all *.conf files
8391    Add kinit long option support for all platforms
8393    Password Expiration "Never" Inconsistently Applied
8394    Add debug message filtering to krb5_klog_syslog
8396    Skip password prompt when running ksu as root
8398    Add libk5crypto support for OpenSSL 1.1.0
8399    Unconstify some krb5 GSS OIDs
8403    kinit documentation page
8404    Remove non-DFSG documentation
8405    Work around python-ldap bug in kerberos.ldif
8412    Link correct VS2015 C libraries for debug builds
8414    Use library malloc for principal, policy entries
8418    Add libkdb function to specialize principal's salt
8419    Do not indicate deprecated GSS mechanisms
8423    Add SPNEGO special case for NTLMSSP+MechListMIC
8425    Add auth-indicator authdata module
8426    test_check_allowed_to_delegate() should free unparsed princ output
8428    Minimize timing leaks in PKINIT decryption
8429    Fix Makefile for paths containing '+' character
8434    Fix memory leak in old gssrpc authentication
8436    Update libev sources to 4.22
8446    Fix leak in key change operations
8451    Add hints for -A flag to kdestroy
8456    Add the kprop-port option to kadmind
8462    Better handle failures to resolve client keytab
8464    Set prompt type for OTP preauth prompt
8465    Improve bad password inference in kinit
8466    Rename k5-queue.h macros
8471    Change KDC error for encrypted timestamp preauth
8476    Restore recursive dump functionality
8478    usability improvements for bttest
8488    Stop generating doc/CHANGES
8490    Add aes-sha2 enctype support
8494    Add krb5_db_register_keytab()
8496    Add KDC discovery from URI records
8498    Potential memory leak in prepare_error_as()
8499    Use getrandom system call on recent Linux kernels
8500    Document krb5_kt_next_entry() requirement
8502    ret_boolean in profile_get_boolean() should be krb5_boolean *
        instead of int *
8504    Properly handle EOF condition on libkrad sockets
8506    PKINIT fails with PKCS#11 middlware that implements PKCS#1 V2.1
8507    Suggest unlocked iteration for mkey rollover
8508    Clarify krb5_kt_resolve() API documentation
8509    Leak in krb5_cccol_have_content with truncated ccache
8510    Update features list for 1.15
8512    Fix detection of libaceclnt for securid_sam2
8513    Add doxygen comments for RFC 8009, RFC 4757
8514    Make zap() more reliable
8516    Fix declaration without type in t_shs3.c
8520    Relicense ccapi/common/win/OldCC/autolock.hxx
8521    Allow slapd path configuration in t_kdb.py

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
    Tom 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
    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
    Philip Brown
    Michael Calmer
    Andrea Campi
    Julien Chaffraix
    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
    Roland Dowdeswell
    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
    William Fiveash
    Jacques Florent
    Ákos Frohner
    Sebastian Galiano
    Marcus Granado
    Scott Grizzard
    Helmut Grohne
    Steve Grubb
    Philip Guenther
    Dominic Hargreaves
    Robbie Harwood
    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
    Wyllys Ingersoll
    Holger Isenberg
    Spencer Jackson
    Diogenes S. Jesus
    Pavel Jindra
    Brian Johannesmeyer
    Joel Johnson
    Anders Kaseorg
    W. Trevor King
    Patrik Kis
    Mikkel Kruse
    Reinhard Kugler
    Tomas Kuthan
    Pierre Labastie
    Volker Lendecke
    Jan iankko Lieskovsky
    Todd Lipcon
    Oliver Loch
    Kevin Longfellow
    Jon Looney
    Nuno Lopes
    Ryan Lynch
    Roland Mainz
    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
    Zoran Pericic
    W. Michael Petullo
    Mark Phalan
    Brett Randall
    Jonathan Reams
    Jonathan Reed
    Robert Relyea
    Martin Rex
    Jason Rogers
    Matt Rogers
    Nate Rosenblum
    Solly Ross
    Mike Roszkowski
    Guillaume Rousse
    Andreas Schneider
    Tom Shaw
    Jim Shi
    Peter Shoults
    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
    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
    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.

Name	Type	Size	Owner/Group	Permission	Last Modified	Actions
.	dir	-	root/root	drwxr-xr-x	2025-02-26 03:21:52
..	dir	-	root/root	drwxr-xr-x	2026-01-07 03:21:50
examples	dir	-	root/root	drwxr-xr-x	2025-02-26 03:21:52
NOTICE	file	59.86 KB	root/root	-rw-r--r--	2017-03-02 10:06:02
README	file	14.77 KB	root/root	-rw-r--r--	2017-03-02 10:06:02