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
114 6693 Fix backwards flag output in krb5_init_creds_step()
119 The krb5-1.8 release contains a large number of changes, featuring
120 improvements in the following broad areas:
123 * Developer experience
125 * End-user experience
126 * Administrator experience
131 * Move toward test-driven development -- new features have test code,
132 or at least written testing procedures.
134 * Remove applications to a separate distribution to simplify
135 independent maintenance.
137 * Increase conformance to coding style
139 + "The great reindent"
141 + Selective refactoring
143 Developer experience:
145 * Crypto modularity -- vendors can more easily substitute their own
146 crypto implementations, which might be hardware-accelerated or
147 validated to FIPS 140, for the builtin crypto implementation that
148 has historically shipped as part of MIT Kerberos. Currently, only
149 an OpenSSL provider is included, but others are planned for the
152 * Move toward improved KDB interface
154 * Improved API for verifying and interrogating authorization data
158 * Investigate and remedy repeatedly-reported performance bottlenecks.
160 * Encryption performance -- new crypto API with opaque key structures,
161 to allow for optimizations such as caching of derived keys
165 * Reduce DNS dependence by implementing an interface that allows
166 client library to track whether a KDC supports service principal
169 Administrator experience:
171 * Disable DES by default -- this reduces security exposure from using
172 an increasingly insecure cipher.
174 * More versatile crypto configuration, to simplify migration away from
175 DES -- new configuration syntax to allow inclusion and exclusion of
176 specific algorithms relative to a default set.
178 * Account lockout for repeated login failures -- mitigates online
179 password guessing attacks, and helps with some enterprise regulatory
182 * Bridge layer to allow Heimdal HDB modules to act as KDB backend
183 modules. This provides a migration path from a Heimdal to an MIT
188 * FAST enhancements -- preauthentication framework enhancements to
189 allow a client to securely negotiate the use of FAST with a KDC of
190 unknown capabilities.
192 * Microsoft Services for User (S4U) compatibility: S4U2Self, also
193 known as "protocol transition", allows for service to ask a KDC for
194 a ticket to themselves on behalf of a client authenticated via a
195 different means; S4U2Proxy allows a service to ask a KDC for a
196 ticket to another service on behalf of a client.
198 * Anonymous PKINIT -- allows the use of public-key cryptography to
199 anonymously authenticate to a realm
201 * Support doing constrained delegation similar to Microsoft's
202 S4U2Proxy without the use of the Windows PAC. This functionality
203 uses a protocol compatible with Heimdal.
205 krb5-1.8 changes by ticket ID
206 -----------------------------
208 5468 delete kadmin v1 support
209 6206 new API for storing extra per-principal data in ccache
210 6434 krb5_cc_resolve() will crash if a null name param is provided
211 6454 Make krb5_mkt_resolve error handling work
212 6510 Restore limited support for static linking
213 6539 Enctype list configuration enhancements
214 6546 KDB should use enctype of stashed master key
215 6547 Modify kadm5 initializers to accept krb5 contexts
216 6563 Implement s4u extensions
217 6564 s4u extensions integration broke test suite...
218 6565 HP-UX IA64 wrong endian
219 6572 Implement GSS naming extensions and authdata verification
220 6576 Implement new APIs to allow improved crypto performance
221 6577 Account lockout for repeated login failures
222 6578 Heimdal DB bridge plugin for KDC back end
223 6580 Constrained delegation without PAC support
224 6582 Memory leak in _kadm5_init_any introduced with ipropd
225 6583 Unbundle applications into separate repository
226 6586 libkrb5 support for non-blocking AS requests
227 6590 allow testing even if name->addr->name mapping doesn't work
228 6591 fix slow behavior on Mac OS X with link-local addresses
229 6592 handle negative enctypes better
230 6593 Remove dependency on /bin/csh in test suite
231 6595 FAST (preauth framework) negotiation
232 6597 Add GSS extensions to store credentials, generate random bits
233 6598 gss_init_sec_context potential segfault
234 6599 memory leak in krb5_rd_req_decrypt_tkt_part
235 6600 gss_inquire_context cannot handle no target name from mechanism
236 6601 gsssspi_set_cred_option cannot handle mech specific option
237 6603 issues with SPNEGO
238 6605 PKINIT client should validate SAN for TGS, not service principal
239 6606 allow testing when offline
240 6607 anonymous PKINIT
241 6616 Fix spelling and hyphen errors in man pages
242 6618 Support optional creation of PID files for krb5kdc and kadmind
243 6620 kdc_supported_enctypes does nothing; eradicate mentions thereof
244 6621 disable weak crypto by default
245 6622 kinit_fast fails if weak enctype is among client principal keys
246 6623 Always treat anonymous as preauth required
247 6624 automated tests for anonymous pkinit
248 6625 yarrow code does not initialize keyblock enctype and uses
250 6626 Restore interoperability with 1.6 addprinc -randkey
251 6627 Set enctype in crypto_tests to prevent memory leaks
252 6628 krb5int_dk_string_to_key fails to set enctype
253 6629 krb5int_derive_key results in cache with uninitialized values
254 6630 krb5int_pbkdf2_hmac_sha1 fails to set enctype on keyblock
255 6632 Simplify and fix FAST check for keyed checksum type
256 6634 Use keyed checksum type for DES FAST
257 6640 Make history key exempt from permitted_enctypes
258 6642 Add test program for decryption of overly short buffers
259 6643 Problem with krb5 libcom_err vs. system libcom_err
260 6644 Change basename of libkadm5 libraries to avoid Heimdal conflict
261 6645 Add krb5_allow_weak_crypto API
262 6648 define MIN() in lib/gssapi/krb5/prf.c
263 6649 Get rid of kdb_ext.h and allow out-of-tree KDB plugins
264 6651 Handle migration from pre-1.7 databases with master key
265 kvno != 1 (1.8 pullup)
266 6652 Make decryption of master key list more robust
267 6653 set_default_enctype_var should filter not reject weak enctypes
268 6654 Fix greet_server build
269 6655 Fix cross-realm handling of AD-SIGNEDPATH
270 6656 krb5int_fast_free_state segfaults if state is null
271 6657 enc_padata can include empty sequence
272 6658 Implement gss_set_neg_mechs
273 6659 Additional memory leaks in kdc
274 6660 Minimal support for updating history key
275 6662 MITKRB5-SA-2010-001 CVE-2010-0283 KDC denial of service
276 6663 update mkrel to deal with changed source layout
277 6665 Fix cipher state chaining in OpenSSL back end
278 6669 doc updates for allow_weak_crypto
283 Past and present Sponsors of the MIT Kerberos Consortium:
286 Carnegie Mellon University
290 The Department of Defense of the United States of America (DoD)
292 Iowa State University
294 Michigan State University
296 The National Aeronautics and Space Administration
297 of the United States of America (NASA)
298 Nippon Telephone and Telegraph (NTT)
300 Pennsylvania State University
304 The University of Alaska
305 The University of Michigan
307 Past and present members of the Kerberos Team at MIT:
360 The following external contributors have provided code, patches, bug
361 reports, suggestions, and valuable resources:
378 Christopher D. Clausen
399 Love Hörnquist Åstrand
439 The above is not an exhaustive list; many others have contributed in
440 various ways to the MIT Kerberos development effort over the years.
441 Other acknowledgments (for bug reports and patches) are in the