Wireshark · Ethereal-dev: [Ethereal-dev] Dissecting SAMR GetDomainPasswordInfo

[dheitmueller <dheitmueller@xxxxxxxxxxx>]

I am looking at the dissection routine for the GetDomainPasswordInfo, and it fails to properly dissect the request.

Looking at the source code (packet-dcerpc-samr.c line 2011), the domain field is using dissect_ndr_pointer.  However, when I look at the payload, it would appear that we are dealing with a straight UNICODE string.

xx xx xx xx xx xx xx xx 08 00 00 00 5c 00 5c 00 ........ ....\.\.
70 00 61 00 75 00 6c 00 32 00 30 00             p.a.u.l. 2.0.

It looks like there is just a length, an offset, then the string.

I am trying to figure out the NDR routines for dissecting strings, and do not see one that handles this format.  If I recall, I had the same issue with the NTLMSSP dissector, and ended up decoding it into three separate fields (length, offset, string) using get_unicode_or_ascii_string.

So here's the question.  Is there a more standard function for decoding this string type.  Also, does anyone have a packet capture for this request that DOES properly dissect the request?  The last thing I want to do is break someone elses dissector.

Devin Heitmueller
Senior Software Engineer
Netilla Networks Inc