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Kerberos double binding creates no bindings (ITS#432)

Hello all.

  I am working on getting OpenLDAP 2.0 working for the CMU campus
here. I CVS downloaded the source in early December and have it
compiled and running on my desktop machine.

  I am working on getting Kerberos authentication working, and ran
into what I'd have to call a bug. It has to do with a client such as
ldapsearch uses ldap_kerberos_bind_s() and how the server binds your
DN using do_bind().

  When a client uses ldap_kerberos_bind_s() it first binds with an
authmethod LDAP_AUTH_KRBV41 (the "ldapserver" ticket), and then again
with LDAP_AUTH_KRBV42 (the "x500dsa" ticket). On the server, in the


the first bind does all of the leg work of checking the krbName and
returns 0 to the calling function


The second bind on the server simply sends a SUCCESS message back to
the client and returns a non-zero code back to do_bind(), with the
comment "stop front end from sending result". 

  When do_bind() was called, it first cleared any previous bindings and
then if the backend bind returns 0 it will store the requested DN in
the connection.

  The bug is that the second (LDAP_AUTH_KRBV42) binding in
ldbm_back_bind() always returns a non-zero code to do_bind(), so the
DN binding from the first binding was erased and not stored the second 
time. The result is a connection that has NO binding: you are

  I am curious as to why the second binding wants to send the SUCCESS
message itself and return !0, instead of returning 0 and letting
do_bind() return SUCCESS (and set the DN binding).

-Mark Adamson

PS  My first day of reading/posting to this group. Pardon any