On Thu, Sep 09, 2010 at 11:12:52PM +1000, Andrew Bartlett wrote: > On Thu, 2010-09-09 at 14:33 +0200, John Anderson wrote: > > On 09/09/10 13:57, Andrew Bartlett wrote: > > > On Tue, 2010-09-07 at 17:35 +0200, John Anderson wrote: > > >> I have a linux firewall using winbind to authenticate users coming in > > >> with PPTP. It all seemed to work OK at first. After a while I noticed > > >> that authentication was denied to users who had previously (as in less > > >> than a day) authenticated successfully. After a day or so of fighting > > >> with this setup, I found that restarting winbindd will allow users to > > >> authenticate successfully again. This happens with both the built-in > > >> windows PPTP VPN client, and pppd as a client under linux. > > >> > > >> What happens is: > > >> > > >> - restart winbind > > >> - authenticate a user > > >> - close pptp connection > > >> - a few minutes (seems like around 10) after a first (or several) > > >> successful authentication, I get the following ppp trace on the client > > >> side: > > >> > > >> rcvd [CHAP Challenge id=0x8b<8b7f80d136cce1a774e888a0d4e83bbc>, name = > > >> "pptpd"] > > >> sent [CHAP Response id=0x8b > > >> <95c9d3a1061299d9ca4874659c37f1720000000000000000161c5daea05d0ded24eaf8ca99f338ab4e8f6491e86cdd4900>, > > >> name = "xxxxx"] > > >> rcvd [CHAP Success id=0x8b "S=5DB7336F26A8F34ABA08DCD453760E3808A090FF > > >> M=Access granted"] > > >> 5DB7336F26A8F34ABA08DCD453760E3808A090FF M=Access granted > > >> F8673CADD4286B742EF0C39036393650701D0A60 > > >> MS-CHAPv2 mutual authentication failed. > > >> CHAP authentication failed > > >> sent [LCP TermReq id=0x2 "Failed to authenticate ourselves to peer"] > > >> > > >> In other words, the ntlm-auth helper and AD server says OK, but the > > >> hashes aren't equal, which causes ppp to say "mutual authentication > > >> failed". I hacked the ppp sources (chap_ms.c) gently to output the two > > >> hashes. > > > > > >> I'be been using samba-3.5.4 (and 3.4.6 and 3.4.8) and ppp-2.4.[2345] > > >> (tried all of them) on a x86_64 gentoo box. > > > > > > Try with the lastest GIT tree. We finally fixed a bug which caused this > > > kind of breakage. (We returned the wrong session key, which is why the > > > server thinks this is OK, but the client isn't impressed). > > > > Thanks for your reply. > > > > I have to get this onto a box on the other end of a 512kbps line with a > > bandwidth cap, so I'd prefer not to clone the entire repository. Would > > the v3-6-stable head have the fix? > > I would have said that v3-6-test should have it. I don't know about > v3-6-stable, sorry.
all branches have the fix now, you could also individually apply the fix mentioned in https://bugzilla.samba.org/show_bug.cgi?id=7568. We got reports that this resolves exactly that issue. Thanks, Guenther -- Günther Deschner GPG-ID: 8EE11688 Red Hat [email protected] Samba Team [email protected]
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