[Bug 50634] New: IADsOpenDSObject::OpenDSObject() must be splitting "domain\user" username into ldap_bind_s()'s Domain and User

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=50634

Bug ID: 50634
           Summary: IADsOpenDSObject::OpenDSObject() must be splitting
                    "domain\user" username into ldap_bind_s()'s Domain and
                    User
           Product: Wine
           Version: 6.1
          Hardware: x86-64
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: activeds
          Assignee: [e-mail]
          Reporter: [e-mail]
      Distribution: ---

Created attachment 69341
  --> https://bugs.winehq.org/attachment.cgi?id=69341
AD domain\user authentication test case

As per the patch I am going to send:

"Extensive tests show that, for the secure authentication case, adsldp's
IADsOpenDSObject::OpenDSObject() and wldap32's ldap_bind_s() both agree on
success/failure and generate equivalent network packets, only when
IADsOpenDSObject::OpenDSObject() splits up "domain\user" style usernames into
SEC_WINNT_AUTH_IDENTITY_W's Domain and User, while ldap_bind_s() receives them
already split up like that, regardless of the domain's format (domain,
domain.local) or even correctness."

This is the testcase I used to develop my patch. It requires a specific AD
server so I cannot add it to the tree.

Build:
i686-w64-mingw32-gcc10 ldaptest.c -o ldaptest.exe -lwldap32 -lole32 -loleaut32

Run:
[wine] ldaptest.exe server:port user password

with the "user" being either a username or domain\username with different
domains.