[11548] in Kerberos-V5-bugs
[krbdev.mit.edu #6726] SPNEGO doesn't interoperate with Windows 2000
daemon@ATHENA.MIT.EDU (Arlene Berry" via RT)
Wed May 19 16:51:40 2010
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From: ""Arlene Berry" via RT" <rt-comment@krbdev.MIT.EDU>
In-Reply-To: <rt-6726@krbdev.mit.edu>
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To: "'AdminCc of krbdev.mit.edu Ticket #6726'":;"'AdminCc of krbdev.mit.edu Ticket #6726'":;@MIT.EDU
Date: Wed, 19 May 2010 16:51:38 -0400 (EDT)
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The problem is Windows 2000 returns a second copy of the mechanism
response token as the mechListMIC. We saw this with Windows 2000
Server. We worked around the problem by changing get_negTokenResp which
parses out the SPNEGO token components to detect the duplicate token and
not return it as a mechListMIC. This prevents subsequent errors when
attempting to parse the duplicate response as a mechListMIC and was
enough for it to work. The decision as to whether a mechListMIC is
required happens elsewhere and is unchanged.
Index: src/lib/gssapi/spnego/spnego_mech.c
===================================================================
--- src/lib/gssapi/spnego/spnego_mech.c (revision 40750)
+++ src/lib/gssapi/spnego/spnego_mech.c (revision 40751)
@@ -3111,6 +3111,19 @@
*mechListMIC = get_input_token(&ptr, REMAIN);
if (*mechListMIC == GSS_C_NO_BUFFER)
return GSS_S_DEFECTIVE_TOKEN;
+
+ /* Handle Windows 2000 duplicate response token */
+ if (*responseToken &&
+ ((*responseToken)->length ==
(*mechListMIC)->length) &&
+ !memcmp((*responseToken)->value,
(*mechListMIC)->value,
+ (*responseToken)->length))
+ {
+ OM_uint32 tmpmin;
+
+ gss_release_buffer(&tmpmin, *mechListMIC);
+ free(*mechListMIC);
+ *mechListMIC = NULL;
+ }
}
return GSS_S_COMPLETE;
#undef REMAIN
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