krb5 commit [krb5-1.20]: Update README for krb5-1.20

https://github.com/krb5/krb5/commit/bc560fb1d3bc9e29a30a26176bae3a795b133687
commit bc560fb1d3bc9e29a30a26176bae3a795b133687
Author: Greg Hudson <[email protected]>
Date:   Wed Mar 23 18:08:01 2022 -0400

    Update README for krb5-1.20

 README |  134 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++--
 1 files changed, 130 insertions(+), 4 deletions(-)

diff --git a/README b/README
index 9a3c359..f343250 100644
--- a/README
+++ b/README
@@ -64,18 +64,128 @@ 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 no longer supported
------------------------
+PAC transition
+--------------
+
+Beginning with release 1.20, the KDC will include minimal PACs in
+tickets instead of AD-SIGNEDPATH authdata.  S4U requests (protocol
+transition and constrained delegation) must now contain valid PACs in
+the incoming tickets.  If only some KDCs in a realm have been upgraded
+across version 1.20, the upgraded KDCs will reject S4U requests
+containing tickets from non-upgraded KDCs and vice versa.
+
+Triple-DES transition
+---------------------
+
+Beginning with the krb5-1.19 release, a warning will be issued if
+initial credentials are acquired using the des3-cbc-sha1 encryption
+type.  In future releases, this encryption type will be disabled by
+default and eventually removed.
 
-Beginning with the krb5-1.18 release, single-DES encryption types are
-no longer supported.
+Beginning with the krb5-1.18 release, single-DES encryption types have
+been removed.
 
 Major changes in 1.20
 ---------------------
 
+Administrator experience:
+
+* Added a "disable_pac" realm relation to suppress adding PAC authdata
+  to tickets, for realms which do not need to support S4U requests.
+
+* Most credential cache types will use atomic replacement when a cache
+  is reinitialized using kinit or refreshed from the client keytab.
+
+* kprop can now propagate databases with a dump size larger than 4GB,
+  if both the client and server are upgraded.
+
+* kprop can now work over NATs that change the destination IP address,
+  if the client is upgraded.
+
+Developer experience:
+
+* Updated the KDB interface.  The sign_authdata() method is replaced
+  with the issue_pac() method, allowing KDB modules to add logon info
+  and other buffers to the PAC issued by the KDC.
+
+* Host-based initiator names are better supported in the GSS krb5
+  mechanism.
+
+Protocol evolution:
+
+* Replaced AD-SIGNEDPATH authdata with minimal PACs.
+
+* To avoid spurious replay errors, password change requests will not
+  be attempted over UDP until the attempt over TCP fails.
+
+* PKINIT will sign its CMS messages with SHA-256 instead of SHA-1.
+
+Code quality:
+
+* Updated all code using OpenSSL to be compatible with OpenSSL 3.
+
+* Reorganized the libk5crypto build system to allow the OpenSSL
+  back-end to pull in material from the builtin back-end depending on
+  the OpenSSL version.
+
+* Simplified the PRNG logic to always use the platform PRNG.
+
+* Converted the remaining Tcl tests to Python.
+
 krb5-1.20 changes by ticket ID
 ------------------------------
 
+7707    Credential cache API does not support atomic reinitialization
+8010    gss_store_cred should initialize ccache and work with collections
+8970    Wrong Encryption types shown in MIT Kerberos Ticket Manager on Windows
+8976    all-liblinks build target fails when symlinks not supported
+8977    Allow kprop over more types of NATs
+8978    Support host-based GSS initiator names
+8980    Add APIs for marshalling credentials
+8981    Documentation__krb5.conf
+8983    Infer name type when creating principals
+8988    Only require one valid pkinit anchor/pool value
+8990    Add KCM_OP_GET_CRED_LIST for faster iteration
+8991    Fix PKINIT memory leaks
+8994    Fix gss-krb5 handling of high sequence numbers
+8995    KCM interop issue with KRB5_TC_ flags
+8997    Use KCM_OP_RETRIEVE in KCM client
+8998    Simplify krb5_cccol_have_content()
+8999    Add additional KRB5_TRACE points
+9000    Fix multiple UPN handling in PKINIT client certs
+9002    Check for undefined kadm5 policy mask bits
+9003    Add duplicate check to kadm5_create_policy()
+9009    Update IRC pointer in resources.rst
+9010    Add MAXHOSTNAME guard in Windows public header
+9011    Fix some principal realm canonicalization cases
+9012    Allow kinit with keytab to defer canonicalization
+9013    Fix kadmin -k with fallback or referral realm
+9017    Clarify and correct interposer plugin docs
+9019    make check fails: OSError: AF_UNIX path too long
+9022    Potential integer overflows
+9024    Find gss_get_mic_iov extensions in GSS modules
+9025    Use version-independent OpenLDAP links in docs
+9027    Add OpenLDAP advice to princ_dns.rst
+9028    Constify name field in four plugin vtables
+9031    Fix verification of RODC-issued PAC KDC signature
+9032    Always use platform PRNG
+9034    Use builtin MD4, RC4 for OpenSSL 3.0
+9035    Avoid use after free during libkrad cleanup
+9036    Support larger RADIUS attributes in libkrad
+9037    Race condition in krb5_set_password()
+9038    Issue an error from KDC on S4U2Self failures
+9039    Fix PAC handling of authtimes after y2038
+9040    Use 14 instead of 9 for unkeyed SHA-1 checksum
+9041    Add PA-REDHAT-IDP-OAUTH2 padata type
+9042    Don't fail krb5_cc_select() for no default realm
+9043    Add PAC ticket signature APIs
+9044    Replace AD-SIGNEDPATH with minimal PACs
+9047    Avoid passing null for asprintf strings
+9048    Pass client flag to KDB for client preauth match
+9049    Add replace_reply_key kdcpreauth callback
+9050    Implement replaced_reply_key input to issue_pac()
+9051    Clarify certauth interface documentation
+
 Acknowledgements
 ----------------
 
@@ -195,6 +305,8 @@ reports, suggestions, and valuable resources:
     Sumit Bose
     Emmanuel Bouillon
     Isaac Boukris
+    Ulf Bremer
+    Pavel Březina
     Philip Brown
     Samuel Cabrero
     Michael Calmer
@@ -226,6 +338,7 @@ reports, suggestions, and valuable resources:
     John Devitofranceschi
     Marc Dionne
     Roland Dowdeswell
+    Ken Dreyer
     Dorian Ducournau
     Viktor Dukhovni
     Jason Edgecombe
@@ -244,6 +357,7 @@ reports, suggestions, and valuable resources:
     Frank Filz
     William Fiveash
     Jacques Florent
+    Oliver Freyermuth
     Ákos Frohner
     Sebastian Galiano
     Marcus Granado
@@ -261,6 +375,7 @@ reports, suggestions, and valuable resources:
     Matthieu Hautreux
     Jochen Hein
     Paul B. Henson
+    Kihong Heo
     Jeff Hodges
     Christopher Hogan
     Love Hörnquist Åstrand
@@ -275,6 +390,7 @@ reports, suggestions, and valuable resources:
     Holger Isenberg
     Spencer Jackson
     Diogenes S. Jesus
+    Mike Jetzer
     Pavel Jindra
     Brian Johannesmeyer
     Joel Johnson
@@ -288,6 +404,7 @@ reports, suggestions, and valuable resources:
     Patrik Kis
     Martin Kittel
     Thomas Klausner
+    Tomasz Kłoczko
     Matthew Krupcale
     Mikkel Kruse
     Reinhard Kugler
@@ -316,7 +433,9 @@ reports, suggestions, and valuable resources:
     Nathaniel McCallum
     Greg McClement
     Cameron Meadors
+    Vipul Mehta
     Alexey Melnikov
+    Ivan A. Melnikov
     Franklyn Mendez
     Mantas Mikulėnas
     Markus Moeller
@@ -324,6 +443,7 @@ reports, suggestions, and valuable resources:
     Paul Moore
     Keiichi Mori
     Michael Morony
+    Sam Morris
     Zbysek Mraz
     Edward Murrell
     Joshua Neuheisel
@@ -351,6 +471,7 @@ reports, suggestions, and valuable resources:
     Tony Reix
     Martin Rex
     Pat Riehecky
+    Julien Rische
     Jason Rogers
     Matt Rogers
     Nate Rosenblum
@@ -360,6 +481,7 @@ reports, suggestions, and valuable resources:
     Joshua Schaeffer
     Alexander Scheel
     Jens Schleusener
+    Ryan Schmidt
     Andreas Schneider
     Paul Seyfert
     Tom Shaw
@@ -373,12 +495,15 @@ reports, suggestions, and valuable resources:
     Michael Ströder
     Bjørn Tore Sund
     Ondřej Surý
+    Joseph Sutton
     Joe Travaglini
     Sergei Trofimovich
     Greg Troxel
+    Fraser Tweedale
     Tim Uglow
     Rathor Vipin
     Denis Vlasenko
+    Thomas Wagner
     Jorgen Wahlsten
     Stef Walter
     Max (Weijun) Wang
@@ -400,6 +525,7 @@ reports, suggestions, and valuable resources:
     Xu Qiang
     Neng Xue
     Zhaomo Yang
+    Tianjiao Yin
     Nickolai Zeldovich
     Bean Zhang
     Hanz van Zijst

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