problems with making calls to gssapi32.dll on Windows XP

Wyllys Ingersoll wyllys.ingersoll at
Tue Jul 26 08:58:07 EDT 2005

David -
    SSPI should work with the GSSAPI mechanisms from
MIT, Sun, and Heimdal, I don't know of anything that
prevents interop of SSPI and GSSAPI.

Also,   what about using SASL instead of GSSAPI
( ?


David Bienvenu wrote:

> Hi,
> My name is David Bienvenu, and I work on mail&news for the Mozilla 
> Foundation. I'm trying to make calls to gssapi32.dll from Mozilla 
> code, to add MIT Kerberos support to Mozilla Mail and Thunderbird (My 
> understanding is that using SSPI on Windows won't work with MIT's KDC, 
> and I want to support MIT's KDC since I think that's widely used). I 
> took Mozilla's existing negotiateuth code ( 
> ) and flipped some makefile switches so that we'd use GSSAPI on 
> Windows, like we do successfully for linux and mac. I had to add 
> gssapi32 to the list of libraries we look for.  After that, our gssapi 
> code found the right entry points and was able to call them 
> successfully. But, the out parameters to those calls, e.g., 
> gss_indicate_mechs_ptr, initially look OK, but as I execute code after 
> the call, the values become corrupted, and we crash. For example, 
> calling gss_release_oid_set_ptr crashes because the gss_OID_set 
> mech_set either gets nulled out, or corrupted in weird ways. It's 
> bizarre to step through the vc 6.0 debugger and eventually see the 
> local variables change value even though the disassembled code doesn't 
> change the local vars. I'm wondering if you have any idea what could 
> be going on, or point me to someone who might know. I would suspect 
> some sort of calling convention problem, but we're using the standard 
> cdecl calling convention.
> The gssapi32.dll in windows/system32 has a version of, created 
> 3/20/2002. I believe the Kerberos version is, which is what 
> the institution I'm trying to help uses. I'm using the vc 6.0 dev 
> tools, and we compile with fairly vanilla flags, /Zi, basically. This 
> is a debug build of Mozilla.
> thx for any pointers you can give,
> - David Bienvenu
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