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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.