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Kerberos Version 5, Release 1.8 Release Notes The MIT Kerberos Team Copyright and Other Notices --------------------------- Copyright (C) 1985-2011 by the Massachusetts Institute of Technology and its contributors. All rights reserved. Please see the file named NOTICE for additional notices. MIT Kerberos is a project of the MIT Kerberos Consortium. For more information about the Kerberos Consortium, see http://kerberos.org/ For more information about the MIT Kerberos software, see http://web.mit.edu/kerberos/ People interested in participating in the MIT Kerberos development effort should visit http://k5wiki.kerberos.org/ Building and Installing Kerberos 5 ---------------------------------- The first file you should look at is doc/install-guide.ps; it contains the notes for building and installing Kerberos 5. The info file krb5-install.info has the same information in info file format. You can view this using the GNU emacs info-mode, or by using the standalone info file viewer from the Free Software Foundation. This is also available as an HTML file, install.html. Other good files to look at are admin-guide.ps and user-guide.ps, which contain the system administrator's guide, and the user's guide, respectively. They are also available as info files kerberos-admin.info and krb5-user.info, respectively. These files are also available as HTML files. If you are attempting to build under Windows, please see the src/windows/README file. Reporting Bugs -------------- Please report any problems/bugs/comments using the krb5-send-pr program. The krb5-send-pr program will be installed in the sbin directory once you have successfully compiled and installed Kerberos V5 (or if you have installed one of our binary distributions). If you are not able to use krb5-send-pr because you haven't been able compile and install Kerberos V5 on any platform, you may send mail to email@example.com. Please keep in mind that unencrypted e-mail is not secure. If you need to report a security vulnerability, or send sensitive information, please PGP-encrypt it to firstname.lastname@example.org. You may view bug reports by visiting http://krbdev.mit.edu/rt/ and logging in as "guest" with password "guest". DES transition -------------- The krb5-1.8 release disables single-DES cryptosystems by default. As a result, you may need to add the libdefaults setting "allow_weak_crypto = true" to communicate with existing Kerberos infrastructures if they do not support stronger ciphers. 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 now defaults to "false" beginning with krb5-1.8. The krb5-1.8 release includes additional measures to ease the transition away from single-DES. These additional measures include: * enctype config enhancements (so you can do "DEFAULT +des", etc.) * new API to allow applications (e.g. AFS) to explicitly reenable weak crypto * easier kadmin history key changes Major changes in 1.8.4 ---------------------- This is primarily a bugfix release. * Fix MITKRB5-SA-2011-006 KDC denial of service vulnerabilities [CVE-2011-1528 CVE-2011-1529 CVE-2011-4151]. krb5-1.8.4 changes by ticket ID ------------------------------- 6925 Memory leak in save_error_string_nocopy() 6926 work around Dejagnu failure on modern Tcl 6983 SA-2011-006 KDC denial of service [CVE-2011-1527 CVE-2011-1528 CVE-2011-1529] 6984 modernize doc/Makefile somewhat 6991 fix tar invocation in mkrel Major changes in 1.8.4 ---------------------- This is primarily a bugfix release. * Fix vulnerabilities: ** KDC uninitialized pointer crash [MITKRB5-SA-2010-006 CVE-2010-1322] ** kpropd denial of service [MITKRB5-SA-2011-001 CVE-2010-4022] ** KDC denial of service attacks [MITKRB5-SA-2011-002 CVE-2011-0281 CVE-2011-0282 CVE-2011-0283] ** KDC double-free when PKINIT enabled [MITKRB5-SA-2011-003 CVE-2011-0284] ** kadmind frees invalid pointer [MITKRB5-SA-2011-004 CVE-2011-0285] * Interoperability: ** Correctly encrypt GSSAPI forwarded credentials using the session key, not a subkey. ** Set NT-SRV-INST on TGS principal names as expected by some Windows Server Domain Controllers. ** Don't reject AP-REQ messages if their PAC doesn't validate; suppress the PAC instead. ** Correctly validate HMAC-MD5 checksums that use DES keys krb5-1.8.4 changes by ticket ID ------------------------------- 6701 syntax error in src/plugins/kdb/ldap/libkdb_ldap/kerberos.ldif 6764 has_mandatory_for_kdc_authdata checks only first authdata element 6768 GSSAPI forwarded credentials must be encrypted in session key 6790 skip invalid enctypes instead of erroring out in krb5_dbe_def_search_enctype 6797 CVE-2010-1322 KDC uninitialized pointer crash in authorization data handling (MITKRB5-SA-2010-006) 6798 set NT-SRV-INST on TGS principal names 6833 SA-2010-007 Checksum vulnerabilities (CVE-2010-1324 and others) 6843 handle MS PACs that lack server checksum 6853 Make gss_krb5_set_allowable_enctypes work for the acceptor (1.8 pullup) 6861 kpropd denial of service [MITKRB5-SA-2011-001 CVE-2010-4022] 6862 KDC denial of service attacks [MITKRB5-SA-2011-002 CVE-2011-0281 CVE-2011-0282] 6876 hmac-md5 checksum doesn't work with DES keys 6877 Don't reject AP-REQs based on PACs 6882 KDC double-free when PKINIT enabled [MITKRB5-SA-2011-003 CVE-2011-0284] 6900 kadmind frees invalid pointer [MITKRB5-SA-2011-004 CVE-2011-0285] Major changes in 1.8.3 ---------------------- * Behavior Change: GSS-API context expiration -- the gss_wrap and gss_unwrap functions no longer check for ticket expiration. Applications wishing to enforce ticket lifetimes should check using the gss_inquire_context function. The previous behavior of checking for ticket expiration produced results that were not expected by application developers, and could lead to poor user experience. * Fix an interoperability issue when the Microsoft HMAC-MD5 checksum type was used with non-RC4 keys. * Fix an interoperability issue with ephemeral Diffie-Hellman key exchange in PKINIT that would happen for less than 1% of transactions. krb5-1.8.3 changes by ticket ID ------------------------------- 6345 no kdb5_util stash equivalent with LDAP database 6738 PKINIT DH exchange occasionally produces mismatch 6739 Behavior change: gssapi context expiration 6740 kadmin ktadd may display wrong name of default keytab 6744 only test t_locate_kdc if known-good DNS name is present 6745 Add correct error table when initializing gss-krb5 6750 krb5kdc doesn't parse the -P command-line option correctly 6751 Allow Microsoft HMAC-MD5 checksum types to use non-RC4 keys Major changes in 1.8.2 ---------------------- This is primarily a bugfix release. * Fix vulnerabilities: ** CVE-2010-1320 KDC double free caused by ticket renewal (MITKRB5-SA-2010-004) ** CVE-2010-1321 GSS-API lib null pointer deref (MITKRB5-SA-2010-005) * Allow numeric IPv6 addresses for configuring KDC locations. krb5-1.8.2 changes by ticket ID ------------------------------- 6562 kinit not working if kdc is configured with numerical IPv6 address 6696 gss_accept_sec_context doesn't produce error tokens 6697 segfault caused by dlerror returning NULL 6698 kproplog displays incorrect iprop timestamps on 64-bit platforms 6702 CVE-2010-1320 KDC double free caused by ticket renewal (MITKRB5-SA-2010-004) 6711 memory leak in process_tgs_req in r23724 6718 Make KADM5_FAIL_AUTH_COUNT_INCREMENT more robust with LDAP 6722 Error handling bug in krb5_init_creds_init() 6725 CVE-2010-1321 GSS-API lib null pointer deref (MITKRB5-SA-2010-005) 6726 SPNEGO doesn't interoperate with Windows 2000 6730 kdc_tcp_ports not documented in kdc.conf.M 6734 FAST negotiation could erroneously succeed Major changes in 1.8.1 ---------------------- This is primarily a bugfix release. * MITKRB5-SA-2010-002 CVE-2010-0628 denial of service in SPNEGO * Support IPv6 in kpasswd client. * Fix an authorization data type number assignment that conflicted with an undocumented Microsoft usage. krb5-1.8.1 changes by ticket ID ------------------------------- 6661 [RFE] properly support IPv6 in kpasswd 6668 Two problems in kadm5_get_principal mask handling 6674 memory leak in SPNEGO 6676 Ignore improperly encoded signedpath AD elements 6678 use of freed memory in gss_import_sec_context error path 6680 the "ticket_lifetime" setting isn't documented 6681 krb5_get_init_creds_password() can crash with NULL options and expired keys 6683 kpasswd doesn't guess the client principal name correctly without a ccache 6685 handle NT_SRV_INST in service principal referrals 6687 Change KRB5_AUTHDATA_SIGNTICKET from 142 to 512 6689 krb5_typed_data not castable to krb5_pa_data on 64-bit MacOSX 6690 MITKRB5-SA-2010-002 CVE-2010-0628 denial of service in SPNEGO 6693 Fix backwards flag output in krb5_init_creds_step() Major changes in 1.8 -------------------- The krb5-1.8 release contains a large number of changes, featuring improvements in the following broad areas: * Code quality * Developer experience * Performance * End-user experience * Administrator experience * Protocol evolution Code quality: * Move toward test-driven development -- new features have test code, or at least written testing procedures. * Remove applications to a separate distribution to simplify independent maintenance. * Increase conformance to coding style + "The great reindent" + Selective refactoring Developer experience: * Crypto modularity -- vendors can more easily substitute their own crypto implementations, which might be hardware-accelerated or validated to FIPS 140, for the builtin crypto implementation that has historically shipped as part of MIT Kerberos. Currently, only an OpenSSL provider is included, but others are planned for the future. * Move toward improved KDB interface * Improved API for verifying and interrogating authorization data Performance: * Investigate and remedy repeatedly-reported performance bottlenecks. * Encryption performance -- new crypto API with opaque key structures, to allow for optimizations such as caching of derived keys End-user experience: * Reduce DNS dependence by implementing an interface that allows client library to track whether a KDC supports service principal referrals. Administrator experience: * Disable DES by default -- this reduces security exposure from using an increasingly insecure cipher. * More versatile crypto configuration, to simplify migration away from DES -- new configuration syntax to allow inclusion and exclusion of specific algorithms relative to a default set. * Account lockout for repeated login failures -- mitigates online password guessing attacks, and helps with some enterprise regulatory compliance. * Bridge layer to allow Heimdal HDB modules to act as KDB backend modules. This provides a migration path from a Heimdal to an MIT KDC. Protocol evolution: * FAST enhancements -- preauthentication framework enhancements to allow a client to securely negotiate the use of FAST with a KDC of unknown capabilities. * Microsoft Services for User (S4U) compatibility: S4U2Self, also known as "protocol transition", allows for service to ask a KDC for a ticket to themselves on behalf of a client authenticated via a different means; S4U2Proxy allows a service to ask a KDC for a ticket to another service on behalf of a client. * Anonymous PKINIT -- allows the use of public-key cryptography to anonymously authenticate to a realm * Support doing constrained delegation similar to Microsoft's S4U2Proxy without the use of the Windows PAC. This functionality uses a protocol compatible with Heimdal. krb5-1.8 changes by ticket ID ----------------------------- 5468 delete kadmin v1 support 6206 new API for storing extra per-principal data in ccache 6434 krb5_cc_resolve() will crash if a null name param is provided 6454 Make krb5_mkt_resolve error handling work 6510 Restore limited support for static linking 6539 Enctype list configuration enhancements 6546 KDB should use enctype of stashed master key 6547 Modify kadm5 initializers to accept krb5 contexts 6563 Implement s4u extensions 6564 s4u extensions integration broke test suite... 6565 HP-UX IA64 wrong endian 6572 Implement GSS naming extensions and authdata verification 6576 Implement new APIs to allow improved crypto performance 6577 Account lockout for repeated login failures 6578 Heimdal DB bridge plugin for KDC back end 6580 Constrained delegation without PAC support 6582 Memory leak in _kadm5_init_any introduced with ipropd 6583 Unbundle applications into separate repository 6586 libkrb5 support for non-blocking AS requests 6590 allow testing even if name->addr->name mapping doesn't work 6591 fix slow behavior on Mac OS X with link-local addresses 6592 handle negative enctypes better 6593 Remove dependency on /bin/csh in test suite 6595 FAST (preauth framework) negotiation 6597 Add GSS extensions to store credentials, generate random bits 6598 gss_init_sec_context potential segfault 6599 memory leak in krb5_rd_req_decrypt_tkt_part 6600 gss_inquire_context cannot handle no target name from mechanism 6601 gsssspi_set_cred_option cannot handle mech specific option 6603 issues with SPNEGO 6605 PKINIT client should validate SAN for TGS, not service principal 6606 allow testing when offline 6607 anonymous PKINIT 6616 Fix spelling and hyphen errors in man pages 6618 Support optional creation of PID files for krb5kdc and kadmind 6620 kdc_supported_enctypes does nothing; eradicate mentions thereof 6621 disable weak crypto by default 6622 kinit_fast fails if weak enctype is among client principal keys 6623 Always treat anonymous as preauth required 6624 automated tests for anonymous pkinit 6625 yarrow code does not initialize keyblock enctype and uses unitialized value 6626 Restore interoperability with 1.6 addprinc -randkey 6627 Set enctype in crypto_tests to prevent memory leaks 6628 krb5int_dk_string_to_key fails to set enctype 6629 krb5int_derive_key results in cache with uninitialized values 6630 krb5int_pbkdf2_hmac_sha1 fails to set enctype on keyblock 6632 Simplify and fix FAST check for keyed checksum type 6634 Use keyed checksum type for DES FAST 6640 Make history key exempt from permitted_enctypes 6642 Add test program for decryption of overly short buffers 6643 Problem with krb5 libcom_err vs. system libcom_err 6644 Change basename of libkadm5 libraries to avoid Heimdal conflict 6645 Add krb5_allow_weak_crypto API 6648 define MIN() in lib/gssapi/krb5/prf.c 6649 Get rid of kdb_ext.h and allow out-of-tree KDB plugins 6651 Handle migration from pre-1.7 databases with master key kvno != 1 (1.8 pullup) 6652 Make decryption of master key list more robust 6653 set_default_enctype_var should filter not reject weak enctypes 6654 Fix greet_server build 6655 Fix cross-realm handling of AD-SIGNEDPATH 6656 krb5int_fast_free_state segfaults if state is null 6657 enc_padata can include empty sequence 6658 Implement gss_set_neg_mechs 6659 Additional memory leaks in kdc 6660 Minimal support for updating history key 6662 MITKRB5-SA-2010-001 CVE-2010-0283 KDC denial of service 6663 update mkrel to deal with changed source layout 6665 Fix cipher state chaining in OpenSSL back end 6669 doc updates for allow_weak_crypto Acknowledgements ---------------- Past and present 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 The National Aeronautics and Space Administration of the United States of America (NASA) Network Appliance (NetApp) Nippon Telephone and Telegraph (NTT) 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 Alexandra Ellwood Carlos Garay Dan Geer Nancy Gilman Matt Hancher Thomas Hardjono Sam Hartman Paul Hill Marc Horowitz Eva Jacobus Miroslav Jurisic Barry Jaspan 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: Brandon Allbery Russell Allbery Brian Almeida Michael B Allen Derek Atkins David Bantz Alex Baule Arlene Berry Jeff Blaine Radoslav Bodo Emmanuel Bouillon Michael Calmer Julien Chaffraix Ravi Channavajhala Srinivas Cheruku Leonardo Chiquitto Howard Chu Andrea Cirulli Christopher D. Clausen Kevin Coffman Simon Cooper Sylvain Cortes Nalin Dahyabhai Dennis Davis Roland Dowdeswell Jason Edgecombe Mark Eichin Shawn M. Emery Douglas E. Engert Peter Eriksson Ronni Feldt Bill Fellows JC Ferguson William Fiveash Ákos Frohner Marcus Granado Scott Grizzard Helmut Grohne Steve Grubb Philip Guenther Dominic Hargreaves Jakob Haufe Jeff Hodges Love Hörnquist Åstrand Ken Hornstein Henry B. Hotz Luke Howard Jakub Hrozek Shumon Huque Jeffrey Hutzelman Wyllys Ingersoll Holger Isenberg Pavel Jindra Joel Johnson Mikkel Kruse Volker Lendecke Jan iankko Lieskovsky Kevin Longfellow Ryan Lynch Nathaniel McCallum Cameron Meadors Franklyn Mendez Markus Moeller Paul Moore Keiichi Mori Zbysek Mraz Edward Murrell Nikos Nikoleris Felipe Ortega Dmitri Pal Javier Palacios Ezra Peisach W. Michael Petullo Mark Phalan Robert Relyea Martin Rex Jason Rogers Mike Roszkowski Guillaume Rousse Tom Shaw Peter Shoults Simo Sorce Michael Spang Michael Ströder Bjørn Tore Sund Rathor Vipin Jorgen Wahlsten Max (Weijun) Wang John Washington Marcus Watts Simon Wilkinson Nicolas Williams Ross Wilper Xu Qiang Hanz van Zijst 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.