Author: Greg Hudson <ghudson@mit.edu>
Date:   Fri Jan 7 22:41:30 2022 -0500
    Replace AD-SIGNEDPATH with minimal PACs
    Remove all of the AD-SIGNEDPATH code.  Instead, issue a signed minimal
    PAC in all tickets and require a valid PAC to be present in all
    tickets presented for S4U operations.  Remove the get_authdata_info()
    and sign_authdata() DAL methods, and add an issue_pac() method to
    allow the KDB to add or copy buffers to the PAC.  Add a disable_pac
    realm flag.
    Microsoft revised the S4U2Proxy rules for forwardable tickets.  All
    S4U2Proxy operations require forwardable evidence tickets, but
    S4U2Self should issue a forwardable ticket if the requesting service
    has no ok-to-auth-as-delegate bit but also no constrained delegation
    privileges for traditional S4U2Proxy.  Implement these rules,
    extending the check_allowed_to_delegate() DAL method so that the KDC
    can ask if a principal has any delegation privileges.
    Combine the KRB5_KDB_FLAG_ISSUE_PAC and
    KRB5_FLAG_CLIENT_REFERRALS_ONLY flags into KRB5_KDB_FLAG_CLIENT.
    Rename the KRB5_KDB_FLAG_CANONICALIZE flag to
    KRB5_KDB_FLAG_REFERRAL_OK, and only pass it to get_principal() for
    lookup operations that can use a realm referral.
    For consistency with Active Directory, honor the no-auth-data-required
    server principal flag for S4U2Proxy but not for S4U2Self.  Previously
    we did the reverse.
    ticket: 9044 (new)
commit c85894cfb784257a6acb4d77d8c75137d2508f5e
Author: Greg Hudson <ghudson@mit.edu>
Date:   Fri Jan 7 19:58:42 2022 -0500
    Add minimal KDC MS-RPCE (NDR) encoder/decoder
    Add NDR marshalling functions for S4U_DELEGATION_INFO PAC buffers.
    [ghudson@mit.edu: added safety checks; made minor style changes;
    edited commit message]
commit ee4e3c5c9eee061048d5b7393b8f3820d1a563a8
Author: Isaac Boukris <iboukris@gmail.com>
Date:   Fri Jan 7 13:46:24 2022 -0500
    Add PAC ticket signature APIs
    Microsoft added a third PAC signature over the ticket to prevent
    servers from setting the forwardable flag on evidence tickets.  Add
    new APIs to generate and verify ticket signatures, as well as defines
    for this and other new PAC buffer types.  Deprecate the old signing
    functions as they cannot generate ticket signatures.  Modify several
    error returns to better match the protocol errors generated by Active
    Directory.
    [ghudson@mit.edu: adjusted contracts for KDC requirements; simplified
    and commented code changes; wrote commit message.  rharwood@redhat.com
    also did some work on this commit.]
    ticket: 9043 (new)