1 Kerberos Version 5, Release 1.8
6 Copyright and Other Notices
7 ---------------------------
9 Copyright (C) 1985-2010 by the Massachusetts Institute of Technology
10 and its contributors. All rights reserved.
12 Please see the file named NOTICE for additional notices.
14 MIT Kerberos is a project of the MIT Kerberos Consortium. For more
15 information about the Kerberos Consortium, see http://kerberos.org/
17 For more information about the MIT Kerberos software, see
18 http://web.mit.edu/kerberos/
20 People interested in participating in the MIT Kerberos development
21 effort should see http://k5wiki.kerberos.org/
23 Building and Installing Kerberos 5
24 ----------------------------------
26 The first file you should look at is doc/install-guide.ps; it contains
27 the notes for building and installing Kerberos 5. The info file
28 krb5-install.info has the same information in info file format. You
29 can view this using the GNU emacs info-mode, or by using the
30 standalone info file viewer from the Free Software Foundation. This
31 is also available as an HTML file, install.html.
33 Other good files to look at are admin-guide.ps and user-guide.ps,
34 which contain the system administrator's guide, and the user's guide,
35 respectively. They are also available as info files
36 kerberos-admin.info and krb5-user.info, respectively. These files are
37 also available as HTML files.
39 If you are attempting to build under Windows, please see the
40 src/windows/README file.
45 Please report any problems/bugs/comments using the krb5-send-pr
46 program. The krb5-send-pr program will be installed in the sbin
47 directory once you have successfully compiled and installed Kerberos
48 V5 (or if you have installed one of our binary distributions).
50 If you are not able to use krb5-send-pr because you haven't been able
51 compile and install Kerberos V5 on any platform, you may send mail to
54 Please keep in mind that unencrypted e-mail is not secure. If you need
55 to report a security vulnerability, or send sensitive information,
56 please PGP-encrypt it to krbcore-security@mit.edu.
58 You may view bug reports by visiting
60 http://krbdev.mit.edu/rt/
62 and logging in as "guest" with password "guest".
67 The krb5-1.8 release disables single-DES cryptosystems by default. As
68 a result, you may need to add the libdefaults setting
69 "allow_weak_crypto = true" to communicate with existing Kerberos
70 infrastructures if they do not support stronger ciphers.
72 The Data Encryption Standard (DES) is widely recognized as weak. The
73 krb5-1.7 release contains measures to encourage sites to migrate away
74 from using single-DES cryptosystems. Among these is a configuration
75 variable that enables "weak" enctypes, which now defaults to "false"
76 beginning with krb5-1.8. The krb5-1.8 release includes additional
77 measures to ease the transition away from single-DES. These
78 additional measures include:
80 * enctype config enhancements (so you can do "DEFAULT +des", etc.)
81 * new API to allow applications (e.g. AFS) to explicitly reenable weak
83 * easier kadmin history key changes
85 Major changes in 1.8.1
86 ----------------------
88 This is primarily a bugfix release.
90 * MITKRB5-SA-2010-002 CVE-2010-0628 denial of service in SPNEGO
92 * Support IPv6 in kpasswd client.
94 * Fix an authorization data type number assignment that conflicted
95 with an undocumented Microsoft usage.
97 krb5-1.8.1 changes by ticket ID
98 -------------------------------
100 6661 [RFE] properly support IPv6 in kpasswd
101 6668 Two problems in kadm5_get_principal mask handling
102 6674 memory leak in SPNEGO
103 6676 Ignore improperly encoded signedpath AD elements
104 6678 use of freed memory in gss_import_sec_context error path
105 6680 the "ticket_lifetime" setting isn't documented
106 6681 krb5_get_init_creds_password() can crash with NULL options and
108 6683 kpasswd doesn't guess the client principal name correctly
110 6685 handle NT_SRV_INST in service principal referrals
111 6687 Change KRB5_AUTHDATA_SIGNTICKET from 142 to 512
112 6689 krb5_typed_data not castable to krb5_pa_data on 64-bit MacOSX
113 6690 MITKRB5-SA-2010-002 CVE-2010-0628 denial of service in SPNEGO
118 The krb5-1.8 release contains a large number of changes, featuring
119 improvements in the following broad areas:
122 * Developer experience
124 * End-user experience
125 * Administrator experience
130 * Move toward test-driven development -- new features have test code,
131 or at least written testing procedures.
133 * Remove applications to a separate distribution to simplify
134 independent maintenance.
136 * Increase conformance to coding style
138 + "The great reindent"
140 + Selective refactoring
142 Developer experience:
144 * Crypto modularity -- vendors can more easily substitute their own
145 crypto implementations, which might be hardware-accelerated or
146 validated to FIPS 140, for the builtin crypto implementation that
147 has historically shipped as part of MIT Kerberos. Currently, only
148 an OpenSSL provider is included, but others are planned for the
151 * Move toward improved KDB interface
153 * Improved API for verifying and interrogating authorization data
157 * Investigate and remedy repeatedly-reported performance bottlenecks.
159 * Encryption performance -- new crypto API with opaque key structures,
160 to allow for optimizations such as caching of derived keys
164 * Reduce DNS dependence by implementing an interface that allows
165 client library to track whether a KDC supports service principal
168 Administrator experience:
170 * Disable DES by default -- this reduces security exposure from using
171 an increasingly insecure cipher.
173 * More versatile crypto configuration, to simplify migration away from
174 DES -- new configuration syntax to allow inclusion and exclusion of
175 specific algorithms relative to a default set.
177 * Account lockout for repeated login failures -- mitigates online
178 password guessing attacks, and helps with some enterprise regulatory
181 * Bridge layer to allow Heimdal HDB modules to act as KDB backend
182 modules. This provides a migration path from a Heimdal to an MIT
187 * FAST enhancements -- preauthentication framework enhancements to
188 allow a client to securely negotiate the use of FAST with a KDC of
189 unknown capabilities.
191 * Microsoft Services for User (S4U) compatibility: S4U2Self, also
192 known as "protocol transition", allows for service to ask a KDC for
193 a ticket to themselves on behalf of a client authenticated via a
194 different means; S4U2Proxy allows a service to ask a KDC for a
195 ticket to another service on behalf of a client.
197 * Anonymous PKINIT -- allows the use of public-key cryptography to
198 anonymously authenticate to a realm
200 * Support doing constrained delegation similar to Microsoft's
201 S4U2Proxy without the use of the Windows PAC. This functionality
202 uses a protocol compatible with Heimdal.
204 krb5-1.8 changes by ticket ID
205 -----------------------------
207 5468 delete kadmin v1 support
208 6206 new API for storing extra per-principal data in ccache
209 6434 krb5_cc_resolve() will crash if a null name param is provided
210 6454 Make krb5_mkt_resolve error handling work
211 6510 Restore limited support for static linking
212 6539 Enctype list configuration enhancements
213 6546 KDB should use enctype of stashed master key
214 6547 Modify kadm5 initializers to accept krb5 contexts
215 6563 Implement s4u extensions
216 6564 s4u extensions integration broke test suite...
217 6565 HP-UX IA64 wrong endian
218 6572 Implement GSS naming extensions and authdata verification
219 6576 Implement new APIs to allow improved crypto performance
220 6577 Account lockout for repeated login failures
221 6578 Heimdal DB bridge plugin for KDC back end
222 6580 Constrained delegation without PAC support
223 6582 Memory leak in _kadm5_init_any introduced with ipropd
224 6583 Unbundle applications into separate repository
225 6586 libkrb5 support for non-blocking AS requests
226 6590 allow testing even if name->addr->name mapping doesn't work
227 6591 fix slow behavior on Mac OS X with link-local addresses
228 6592 handle negative enctypes better
229 6593 Remove dependency on /bin/csh in test suite
230 6595 FAST (preauth framework) negotiation
231 6597 Add GSS extensions to store credentials, generate random bits
232 6598 gss_init_sec_context potential segfault
233 6599 memory leak in krb5_rd_req_decrypt_tkt_part
234 6600 gss_inquire_context cannot handle no target name from mechanism
235 6601 gsssspi_set_cred_option cannot handle mech specific option
236 6603 issues with SPNEGO
237 6605 PKINIT client should validate SAN for TGS, not service principal
238 6606 allow testing when offline
239 6607 anonymous PKINIT
240 6616 Fix spelling and hyphen errors in man pages
241 6618 Support optional creation of PID files for krb5kdc and kadmind
242 6620 kdc_supported_enctypes does nothing; eradicate mentions thereof
243 6621 disable weak crypto by default
244 6622 kinit_fast fails if weak enctype is among client principal keys
245 6623 Always treat anonymous as preauth required
246 6624 automated tests for anonymous pkinit
247 6625 yarrow code does not initialize keyblock enctype and uses
249 6626 Restore interoperability with 1.6 addprinc -randkey
250 6627 Set enctype in crypto_tests to prevent memory leaks
251 6628 krb5int_dk_string_to_key fails to set enctype
252 6629 krb5int_derive_key results in cache with uninitialized values
253 6630 krb5int_pbkdf2_hmac_sha1 fails to set enctype on keyblock
254 6632 Simplify and fix FAST check for keyed checksum type
255 6634 Use keyed checksum type for DES FAST
256 6640 Make history key exempt from permitted_enctypes
257 6642 Add test program for decryption of overly short buffers
258 6643 Problem with krb5 libcom_err vs. system libcom_err
259 6644 Change basename of libkadm5 libraries to avoid Heimdal conflict
260 6645 Add krb5_allow_weak_crypto API
261 6648 define MIN() in lib/gssapi/krb5/prf.c
262 6649 Get rid of kdb_ext.h and allow out-of-tree KDB plugins
263 6651 Handle migration from pre-1.7 databases with master key
264 kvno != 1 (1.8 pullup)
265 6652 Make decryption of master key list more robust
266 6653 set_default_enctype_var should filter not reject weak enctypes
267 6654 Fix greet_server build
268 6655 Fix cross-realm handling of AD-SIGNEDPATH
269 6656 krb5int_fast_free_state segfaults if state is null
270 6657 enc_padata can include empty sequence
271 6658 Implement gss_set_neg_mechs
272 6659 Additional memory leaks in kdc
273 6660 Minimal support for updating history key
274 6662 MITKRB5-SA-2010-001 CVE-2010-0283 KDC denial of service
275 6663 update mkrel to deal with changed source layout
276 6665 Fix cipher state chaining in OpenSSL back end
277 6669 doc updates for allow_weak_crypto
282 Past and present Sponsors of the MIT Kerberos Consortium:
285 Carnegie Mellon University
289 The Department of Defense of the United States of America (DoD)
291 Iowa State University
293 Michigan State University
295 The National Aeronautics and Space Administration
296 of the United States of America (NASA)
297 Nippon Telephone and Telegraph (NTT)
299 Pennsylvania State University
303 The University of Alaska
304 The University of Michigan
306 Past and present members of the Kerberos Team at MIT:
359 The following external contributors have provided code, patches, bug
360 reports, suggestions, and valuable resources:
377 Christopher D. Clausen
398 Love Hörnquist Åstrand
438 The above is not an exhaustive list; many others have contributed in
439 various ways to the MIT Kerberos development effort over the years.
440 Other acknowledgments (for bug reports and patches) are in the