We will use the kdc_ rather than krb5_kdc_ prefix for new public APIs exported
from libkdc. Amend the recently introduced
request_{get,set,copy,delete}_attribute APIs to conform.
Remove hdb_entry_ex and revert to the original design of hdb_entry (except with
an additional context member in hdb_entry which is managed by the free_entry
method in HDB).
Add some notes about the KDC plugin API contract, and require plugins to
explicitly indicate which version of the API they support (remove the macro
alias for the current version).
Rename the "windc" plugin API to the more general "kdc" plugin API, for two
reasons: the Heimdal KDC uses the Windows PAC even when not emulating a domain
controller, and the plugin API has accreted methods that are not specific to
emulating a domain controller (such as referral_policy and finalize_reply).
Allow the windc plugin to also implement an audit callback. As part of this
change, both the HDB and windc audit function signatures are changed to return
void.
Add a referral policy hook to the TGS as a more elegant way of resolving
referral detection for Samba). The hook can either rewrite the server_princ in
the request, or it can return an error to disable built-in referral processing.
Add a new method for issuing referrals for entire namespaces of hostnames.
An alias of the form WELLKNOWN/HOSTBASED-NAMESPACE/service/namespace-fqdn@REALM
will cause all requests for host-based principals in the given namespace to be
referred to the given realm.
Make client_access plugin API take a single argument, astgs_request_t. Note: in
order to avoid making r->outpadata public (it's an internal buffer), but allow
Samba to modify the reply pa data, some pointer magic is required.
PACs are included when issuing TGTs, if there is no PAC_ATTRIBUTES buffer
(legacy behavior) or if the attributes buffer indicates the AS client requested
one.
Add PAC_ATTRIBUTES_INFO to the PAC. This info buffer indicates whether the user
explicitly requested a PAC be present or absent.
Note: this changes the windc plugin ABI.
If the UPN_DNS_INFO buffer in the Windows PAC contains a canonical principal
name, use it in lieu of the ticket client name to determine the GSS-API
initiator name.
Samba includes the user's long-term credentials (encrypted in the AS reply key)
to allow legacy authentication protocols such as NTLM to work even if the
pre-authentication mechanism replaced the reply key (as PKINIT does).
Samba also needs to know whether the client explicitly requested a PAC be
included (or excluded), in order to defer PAC exclusion until a service ticket
is issued (thereby avoiding a name binding attack if the user is renamed
between TGT and service ticket issuance).
References:
https://bugzilla.samba.org/show_bug.cgi?id=11441https://bugzilla.samba.org/show_bug.cgi?id=14561Closes: #864
Original authors:
- Joseph Sutton <josephsutton@catalyst.net.nz>
- Andrew Bartlett <abartlet@samba.org>
- Stefan Metzmacher <metze@samba.org>
This lets us call it from Samba.
Signed-off-by: Joseph Sutton <josephsutton@catalyst.net.nz>
[abartlet@samba.org Similar to Samba commit 3bdce12789af1e7a7aba56691f184625a432410d
but also fixed for caller in Heimdal windc plugin tests]
Split Windows PAC signing and verification logic, as the signing has to be when
the ticket is ready.
Create sign and verify the PAC KDC signature if the plugin did not, allowing
for S4U2Proxy to work, instead of KRB5SignedPath.
Use the header key to verify PAC server signature, as the same key used to
encrypt/decrypt the ticket should be used for PAC server signature, like U2U
tickets are signed witht the tgt session-key and not with the longterm key,
and so krbtgt should be no different and the header key should be used.
Lookup the delegated client in DB instead of passing the delegator DB entry.
Add PAC ticket-signatures and related functions.
Note: due to the change from KRB5SignedPath to PAC, S4U2Proxy requests
against new KDC will not work if the evidence ticket was acquired from
an old KDC, and vide versa.
Closes: #767
KRB5SignedPath was a Heimdal-specific authorization data element used to
protect the authenticity of evidence tickets when used in constrained
delegation (without a Windows PAC).
Remove this, to be replaced with the Windows PAC which itself now supports
signing the entire ticket in the TGS key.
