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<div style="direction: ltr;">Just to add another aspect to the discussion, there are at least 3 DLLs out there which implement this functionality (Microsoft’s JDBC driver, jTDS driver and Waffle) + commercial solutions as we have heared. All of them are used
to allow authenticating the current user against services (mostly TDS (SQL Server), SMB and http.</div>
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<div style="direction: ltr;">So having a GSS provider, even when it is not used by default would hugely benefit a lot of projects (especially if it does not require JAAS wrapping and will support Windows 10 with Credential Guard for NTLM and Kerberos)</div>
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<div style="direction: ltr;">Gruss</div>
<div style="direction: ltr;">Bernd</div>
<div style="direction: ltr;">-- </div>
<div style="direction: ltr;">http://bernd.eckenfels.net</div>
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<div id="divRplyFwdMsg" dir="dir="ltr""><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>Von:</b> security-dev <security-dev-bounces@openjdk.java.net> im Auftrag von Nico Williams <nico.williams@twosigma.com><br>
<b>Gesendet:</b> Montag, März 25, 2019 6:38 PM<br>
<b>An:</b> Weijun Wang<br>
<b>Cc:</b> security-dev@openjdk.java.net<br>
<b>Betreff:</b> Re: RFR 6722928: Support SSPI as a native GSS-API provider
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On Mon, Mar 25, 2019 at 11:17:17AM +0800, Weijun Wang wrote: <br>
> > On Mar 23, 2019, at 7:50 AM, Michael Osipov <1983-01-06@gmx.net> wrote: <br>
> >>> There's a few reasons: <br>
> >>> <br>
> >>> - NTLM doesn't have an OID, at least as I remember <br>
> >>> <br>
> >>> - the JDK's JGSS stuff is very Kerberos-specific, especially w/ <br>
> >>> regards to the ServicePermission stuff <br>
> >> <br>
> >> Yes, it needs to check a permission if the token is SPNEGO and <br>
> >> internally it's Kerberos. I also believe the HTTP Negotiate code <br>
> >> there is probably not good at dealing with a Negotiate dialog with <br>
> >> 2 rounds. The first problem should be easy to fix, I'll see if the <br>
> >> 2nd is complicated. <br>
<br>
I expect lots of implementations of HTTP/Negotiate to not support more <br>
than one round trip. However, if a client and server lack credentials <br>
for a common mechanism, authentication will fail or not even start, and <br>
if they do have credentials for a common mechanism but one or both <br>
cannot handle more than one round trip, they'll fail. Either way they <br>
fail, so what's the problem? Ignoring for a moment NTLM's weakness, <br>
adding support for it adds ways to win, not ways to fail. <br>
<br>
> It works. Java's (old) HTTPConnection sends an NTLM token to IIS and <br>
> after 4 messages I see 200 OK. <br>
> <br>
> But 1) Java GSS acceptor does not accept it and I don't want to break <br>
> interop inside Java. <br>
<br>
That's not breaking interop. A Windows initiator and non-Windows <br>
acceptor (and vice-versa) will still interop provided both have Kerberos <br>
credentials. <br>
<br>
> 2) No more permission check. <br>
<br>
I don't understand (2). <br>
<br>
> Not going to do it this time. Later I might ask networking how <br>
> transparent NTLM works and if they needs any permission checking or <br>
> other settings I can probably follow. <br>
<br>
Of course it needs permission checking, except that in a world without <br>
applets that's a bit pointless. <br>
<br>
Nico <br>
-- <br>
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