path: root/README

these were the
		   Kerberos Version 5, Release 1.2

			    Release Notes
which are be updated for the next release by
			The MIT Kerberos Team

Unpacking the Source Distribution
---------------------------------

The source distribution of Kerberos 5 comes in three gzipped tarfiles,
krb5-1.2.src.tar.gz, krb5-1.2.doc.tar.gz, and krb5-1.2.crypto.tar.gz.
The krb5-1.2.doc.tar.gz contains the doc/ directory and this README
file.  The krb5-1.2.src.tar.gz contains the src/ directory and this
README file, except for the crypto library sources, which are in
krb5-1.2.crypto.tar.gz.

Instruction on how to extract the entire distribution follow.  These
directions assume that you want to extract into a directory called
DIST.

If you have the GNU tar program and gzip installed, you can simply do:

	mkdir DIST
	cd DIST
	gtar zxpf krb5-1.2.src.tar.gz
	gtar zxpf krb5-1.2.crypto.tar.gz
	gtar zxpf krb5-1.2.doc.tar.gz

If you don't have GNU tar, you will need to get the FSF gzip
distribution and use gzcat:

	mkdir DIST
	cd DIST
	gzcat krb5-1.2.src.tar.gz | tar xpf -
	gzcat krb5-1.2.crypto.tar.gz | tar xpf -
	gzcat krb5-1.2.doc.tar.gz | tar xpf -

Both of these methods will extract the sources into DIST/krb5-1.2/src
and the documentation into DIST/krb5-1.2/doc.

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
krb5-bugs@mit.edu.

Notes, Major Changes, and Known Bugs for 1.3
------------------------------------

* We now install the compile_et program, so other packages can use the
  installed com_err library with their own error tables.

* The header files we install now assume ANSI/ISO C ('89, not '99).
  We have stopped testing on SunOS 4, even with gcc.  Some of our code
  now has C89-based assumptions, like free(NULL) being well defined,
  that will probably frustrate any attempts to run this code under SunOS
  4 or other pre-C89 systems.

* Some new code, bug fixes, and cleanup for IPv6 support.  [[TODO:
  Insert list of (non-)supporting programs and libraries here.]]

* We have upgraded to autoconf 2.52 (or later), and the syntax for
  specifying certain configuration options have changed.  For example,
  autoconf 2.52 configure scripts let you specify command-line options
  like "configure CC=/some/path/foo-cc", so we have removed some of
  our old options like --with-cc in favor of this approach.

* The client libraries can now use TCP to connect to the KDC.  This
  may be necessary when talking to Microsoft KDCs (domain controllers),
  if they issue you tickets with lots of PAC data.

* If you have versions of the com_err or ss packages installed
  locally, you can use the --with-system-et and --with-system-ss
  configure options to use them rather than using the versions
  supplied here.  Note that the interfaces are assumed to be similar
  to those we supply; in particular, some older, divergent versions of
  the com_err library may not work with the krb5 sources.  The
  CPPFLAGS, LDFLAGS, and SS_LIB variables can be used to help the
  compiler and linker find the installed packages.

Notes, Major Changes, and Known Bugs for 1.2, delete before shipping 1.3
------------------------------------

* Triple DES support, for session keys as well as user or service
  keys, should be nearly complete in this release.  Much of the work
  that has been needed is generic multiple-cryptosystem support, so
  the addition of another cryptosystem should be much easier.

  * GSSAPI support for 3DES has been added.  An Internet Draft is
    being worked on that will describe how this works; it is not
    currently standardized.  Some backwards-compatibility issues in
    this area mean that enabling 3DES support must be done with
    caution; service keys that are used for GSSAPI must not be updated
    to 3DES until the services themselves are upgraded to support 3DES
    under GSSAPI.

* DNS support for locating KDCs is enabled by default.  DNS support
  for looking up the realm of a host is compiled in but disabled by
  default (due to some concerns with DNS spoofing).

  We recommend that you publish your KDC information through DNS even
  if you intend to rely on config files at your own site; otherwise,
  sites that wish to communicate with you will have to keep their
  config files updated with your information.  One of the goals of
  this code is to reduce the client-side configuration maintenance
  requirements as much as is possible, without compromising security.

  See the administrator's guide for information on setting up DNS
  information for your realm.

  One important effect of this for developers is that on many systems,
  "-lresolv" must be added to the compiler command line when linking
  Kerberos programs.

  Configure-time options are available to control the inclusion of the
  DNS code and the setting of the defaults.  Entries in krb5.conf will
  also modify the behavior if the code has been compiled in.

* Numerous buffer-overrun problems have been found and fixed.  Many of
  these were in locations we don't expect can be exploited in any
  useful way (for example, overrunning a buffer of MAXPATHLEN bytes if
  a compiled-in pathname is too long, in a program that has no special
  privileges).  It may be possible to exploit a few of these to
  compromise system security.

* Partial support for IPv6 addresses has been added.  It can be
  enabled or disabled at configure time with --enable-ipv6 or
  --disable-ipv6; by default, the configure script will search for
  certain types and macros, and enable the IPv6 code if they're found.
  The IPv6 support at this time mostly consists of including the
  addresses in credentials.

* A protocol change has been made to the "rcmd" suite (rlogin, rsh,
  rcp) to address several security problems described in Kris
  Hildrum's paper presented at NDSS 2000.  New command-line options
  have been added to control the selection of protocol, since the
  revised protocol is not compatible with the old one.

* A security problem in login.krb5 has been fixed.  This problem was
  only present if the krb4 compatibility code was not compiled in.

* A security problem with ftpd has been fixed.  An error in the in the
  yacc grammar permitted potential root access.

* The client programs kinit, klist and kdestroy have been changed to
  incorporate krb4 support.  New command-line options control whether
  krb4 behavior, krb5 behavior, or both are used.

* Patches from Frank Cusack for much better hardware preauth support
  have been incorporated.

* Patches from Matt Crawford extend the kadmin ACL syntax so that
  restrictions can be imposed on what certain administrators may do to
  certain accounts.

* A KDC on a host with multiple network addresses will now respond to
  a client from the address that the client used to contact it.  The
  means used to implement this will however cause the KDC not to
  listen on network addresses configured after the KDC has started.

Minor changes
-------------

* New software using com_err should use the {add,remove}_error_table
  interface rather than init_XXX_error_table; in fact, the latter
  function in the generate C files will now call add_error_table
  instead of messing with unprotected global variables.

  Karl Ramm has offered to look into reconciling the various
  extensions and changes that have been made in different versions of
  the MIT library, and the API used in the Heimdal equivalent.  No
  timeline is set for this work.

* Some source files (including some header files we install) now have
  annotations for use with the LCLint package from the University of
  Virginia.  LCLint, as of version 2.5q, is not capable of handling
  much of the Kerberos code in its current form, at least not without
  significantly restructuring the Kerberos code, but it has been used
  in limited cases and has uncovered some bugs.  We may try adding
  more annotations in the future.

Minor changes for 1.2, delete this section before shipping 1.3
-------------

* The shell code for searching for the Tcl package at configure time
  has been modified.  If a tclConfig.sh can be found, the information
  it contains is used, otherwise the old searching method is tried.
  Let us know if this new scheme causes any problems.

* Shared library builds may work on HPUX, Rhapsody/MacOS X, and newer
  Alpha systems now.

* The Windows build will now include kvno and gss-sample.

* The routine krb5_secure_config_files has been disabled.  A new
  routine, krb5_init_secure_context, has been added in its place.

* The routine decode_krb5_ticket is now being exported as
  krb5_decode_ticket.  Any programs that used the old name (which
  should be few) should be changed to use the new name; we will
  probably eliminate the old name in the future.

* The CCAPI-based credentials cache code has been changed to store the
  local-clock time of issue and expiration rather than the KDC-clock
  times.

* On systems with large numbers of IP addresses, "kinit" should do a
  better job of acquiring those addresses to put in the user's
  credentials.

* Several memory leaks in error cases in the gssrpc code have been
  fixed.

* A bug with login clobbering some internal static storage on AIX has
  been fixed.

* Per-library initialization and cleanup functions have been added,
  for use in configurations that dynamically load and unload these
  libraries.

* Many compile-time warnings have been fixed.

* The GSS sample programs have been updated to exercise more of the
  API.

* The telnet server should produce a more meaningful error message if
  authentication is required but not provided.

* Changes have been made to ksu to make it more difficult to use it to
  leak information the user does not have access to.

* The sample config file information for the CYGNUS.COM realm has been
  updated, and the GNU.ORG realm has been added.

* A configure-time option has been added to enable a replay cache in
  the KDC.  We recommend its use when hardware preauthentication is
  being used.  It is enabled by default, and can be disabled if
  desired with the configure-time option --disable-kdc-replay-cache.

* Some new routines have been added to the library and krb5.h.

* A new routine has been added to the prompter interface to allow the
  application to determine which of the strings prompted for is the
  user's password, in case it is needed for other purposes.

* The remote kadmin interface has been enhanced to support the
  specification of key/salt types for a principal.

* New keytab entries' key values can now be specified manually with a
  new command in the ktutil program.

* A longstanding bug where certain krb4 exchanges using the
  compatibility library between systems with different byte orders
  would fail half the time has been fixed.

* A source file under the GPL has been replaced with an equivalent
  under the BSD license.  The file, strftime.c, was part of one of the
  OpenVision admin system applications, and was only used on systems
  that don't have strftime() in their C libraries.

* Many bug reports are still outstanding in our database.  We are
  continuing to work on this backlog.


Copyright Notice and Legal Administrivia
----------------------------------------

Copyright (C) 1985-2000 by the Massachusetts Institute of Technology.

All rights reserved.

Export of this software from the United States of America may require
a specific license from the United States Government.  It is the
responsibility of any person or organization contemplating export to
obtain such a license before exporting.

WITHIN THAT CONSTRAINT, permission to use, copy, modify, and
distribute this software and its documentation for any purpose and
without fee is hereby granted, provided that the above copyright
notice appear in all copies and that both that copyright notice and
this permission notice appear in supporting documentation, and that
the name of M.I.T. not be used in advertising or publicity pertaining
to distribution of the software without specific, written prior
permission.  Furthermore if you modify this software you must label
your software as modified software and not distribute it in such a
fashion that it might be confused with the original MIT software.
M.I.T. makes no representations about the suitability of this software
for any purpose.  It is provided "as is" without express or implied
warranty.

THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.

Individual source code files are copyright MIT, Cygnus Support,
OpenVision, Oracle, Sun Soft, FundsXpress, and others.

Project Athena, Athena, Athena MUSE, Discuss, Hesiod, Kerberos, Moira,
and Zephyr are trademarks of the Massachusetts Institute of Technology
(MIT).  No commercial use of these trademarks may be made without
prior written permission of MIT.

"Commercial use" means use of a name in a product or other for-profit
manner.  It does NOT prevent a commercial firm from referring to the
MIT trademarks in order to convey information (although in doing so,
recognition of their trademark status should be given).

----

The following copyright and permission notice applies to the
OpenVision Kerberos Administration system located in kadmin/create,
kadmin/dbutil, kadmin/passwd, kadmin/server, lib/kadm5, and portions
of lib/rpc:

   Copyright, OpenVision Technologies, Inc., 1996, All Rights Reserved

   WARNING: Retrieving the OpenVision Kerberos Administration system 
   source code, as described below, indicates your acceptance of the 
   following terms.  If you do not agree to the following terms, do not 
   retrieve the OpenVision Kerberos administration system.

   You may freely use and distribute the Source Code and Object Code
   compiled from it, with or without modification, but this Source
   Code is provided to you "AS IS" EXCLUSIVE OF ANY WARRANTY,
   INCLUDING, WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY OR
   FITNESS FOR A PARTICULAR PURPOSE, OR ANY OTHER WARRANTY, WHETHER
   EXPRESS OR IMPLIED.  IN NO EVENT WILL OPENVISION HAVE ANY LIABILITY
   FOR ANY LOST PROFITS, LOSS OF DATA OR COSTS OF PROCUREMENT OF 
   SUBSTITUTE GOODS OR SERVICES, OR FOR ANY SPECIAL, INDIRECT, OR
   CONSEQUENTIAL DAMAGES ARISING OUT OF THIS AGREEMENT, INCLUDING, 
   WITHOUT LIMITATION, THOSE RESULTING FROM THE USE OF THE SOURCE 
   CODE, OR THE FAILURE OF THE SOURCE CODE TO PERFORM, OR FOR ANY 
   OTHER REASON.

   OpenVision retains all copyrights in the donated Source Code. OpenVision
   also retains copyright to derivative works of the Source Code, whether
   created by OpenVision or by a third party. The OpenVision copyright 
   notice must be preserved if derivative works are made based on the 
   donated Source Code.

   OpenVision Technologies, Inc. has donated this Kerberos 
   Administration system to MIT for inclusion in the standard 
   Kerberos 5 distribution.  This donation underscores our 
   commitment to continuing Kerberos technology development 
   and our gratitude for the valuable work which has been 
   performed by MIT and the Kerberos community.

----

    Portions contributed by Matt Crawford <crawdad@fnal.gov> were
    work performed at Fermi National Accelerator Laboratory, which is
    operated by Universities Research Association, Inc., under
    contract DE-AC02-76CHO3000 with the U.S. Department of Energy.

---- The implementation of the Yarrow pseudo-random number generator
in src/lib/crypto/yarrow has the following copyright:

Copyright 2000 by Zero-Knowledge Systems, Inc.

Permission to use, copy, modify, distribute, and sell this software
and its documentation for any purpose is hereby granted without fee,
provided that the above copyright notice appear in all copies and that
both that copyright notice and this permission notice appear in
supporting documentation, and that the name of Zero-Knowledge Systems,
Inc. not be used in advertising or publicity pertaining to
distribution of the software without specific, written prior
permission.  Zero-Knowledge Systems, Inc. makes no representations
about the suitability of this software for any purpose.  It is
provided "as is" without express or implied warranty.

ZERO-KNOWLEDGE SYSTEMS, INC. DISCLAIMS ALL WARRANTIES WITH REGARD TO
THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
FITNESS, IN NO EVENT SHALL ZERO-KNOWLEDGE SYSTEMS, INC. BE LIABLE FOR
ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTUOUS ACTION, ARISING OUT
OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.



Acknowledgements
----------------

Appreciation Time!!!!  There are far too many people to try to thank
them all; many people have contributed to the development of Kerberos
V5.  This is only a partial listing....

Thanks to Paul Vixie and the Internet Software Consortium for funding
the work of Barry Jaspan.  This funding was invaluable for the OV
administration server integration, as well as the 1.0 release
preparation process.

Thanks to John Linn, Scott Foote, and all of the folks at OpenVision
Technologies, Inc., who donated their administration server for use in
the MIT release of Kerberos.

Thanks to Jeff Bigler, Mark Eichin, Marc Horowitz, Nancy Gilman, Ken
Raeburn, and all of the folks at Cygnus Support, who provided
innumerable bug fixes and portability enhancements to the Kerberos V5
tree.  Thanks especially to Jeff Bigler, for the new user and system
administrator's documentation.

Thanks to Doug Engert from ANL for providing many bug fixes, as well
as testing to ensure DCE interoperability.

Thanks to Ken Hornstein at NRL for providing many bug fixes and
suggestions.

Thanks to Matt Crawford at FNAL for bugfixes and enhancements.

Thanks to Sean Mullan and Bill Sommerfeld from Hewlett Packard for
their many suggestions and bug fixes.

Thanks to Nalin Dahyabhai of RedHat and Chris Evans for locating and
providing patches for numerous buffer overruns.

Thanks to Christopher Thompson and Marcus Watts for discovering the
ftpd security bug.

Thanks to the members of the Kerberos V5 development team at MIT, both
past and present: Danilo Almeida, Jay Berkenbilt, Richard Basch, John
Carr, Don Davis, Alexandra Ellwood, Nancy Gilman, Matt Hancher, Sam
Hartman, Paul Hill, Marc Horowitz, Eva Jacobus, Miroslav Jurisic,
Barry Jaspan, Geoffrey King, John Kohl, Peter Litwack, Scott McGuire,
Kevin Mitchell, Cliff Neuman, Paul Park, Ezra Peisach, Chris
Provenzano, Ken Raeburn, Jon Rochlis, Jeff Schiller, Brad Thompson,
Harry Tsai, Ted Ts'o, Marshall Vale, Tom Yu.