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From:   Davyd McColl <davydm@gmail.com>
Date:   Mon, 10 Jan 2022 22:30:24 +0200
Message-ID: <CAJjP=BvNVOj3KRnhFgk6xiwnxVhxE-sN98-pr6e1Kzc5Xg5EvQ@mail.gmail.com>
Subject: Re: Possible regression: unable to mount CIFS 1.0 shares from older
 machines since 76a3c92ec9e0668e4cd0e9ff1782eb68f61a179c
To:     Steve French <smfrench@gmail.com>
Cc:     CIFS <linux-cifs@vger.kernel.org>,
        LKML <linux-kernel@vger.kernel.org>
Content-Type: text/plain; charset="UTF-8"
Precedence: bulk

I don't understand. I tracked down the exact commit where the issue
occurs with a 2 hour git bisect. This was after first confirming that
my older 5.14 kernel did not display the symptoms. I can still connect
to the share via windows 11 explorer. I don't know what else I need to
do here to show where the issue was introduced?

Apologies for bouncing mails - literally no email client I have seems
to be capable of plaintext emails, so every time I forget, I have to
find a browser with the gmail web interface to reply.

-d

On Mon, 10 Jan 2022 at 19:31, Steve French <smfrench@gmail.com> wrote:
>
> I want to make sure that we don't have an unrelated regression
> involved here since NTLMv2 replaced NTLMv1 over 20 years ago (googling
> this e.g. I see "NTLMv2, introduced in Windows NT 4.0 SP4 and natively
> supported in Windows 2000")  and should be the default for Windows
> NT4, Windows 2000 etc. as well as any version of Samba from the last
> 15 years+.  I have significant concerns with adding mechanisms that
> were asked to be disabled ~19 years ago e.g. see
> https://support.microsoft.com/en-us/topic/security-guidance-for-ntlmv1-and-lm-network-authentication-da2168b6-4a31-0088-fb03-f081acde6e73
> due to security concerns.
>
> Can we double check that there are not other issues involved in your example?
>
> The concerns about NTLMv1 security concerns (and why it should never
> be used) are very persuasive e.g. many articles like
> https://miriamxyra.com/2017/11/08/stop-using-lan-manager-and-ntlmv1/
>
> On Mon, Jan 10, 2022 at 7:48 AM Davyd McColl <davydm@gmail.com> wrote:
> >
> > Good day
> >
> > I'm following advice from the thread at
> > https://bugzilla.kernel.org/show_bug.cgi?id=215375 as to how to report
> > this, so please bear with me and redirect me as necessary.
> >
> > Since commit 76a3c92ec9e0668e4cd0e9ff1782eb68f61a179c, I'm unable to
> > mount a CIFS 1.0 share ( from a media player: mede8er med600x3d, which
> > runs some older linux). Apparently I'm not the only one, according to
> > that thread, though the other affected party there is windows-based.
> >
> > I first logged this in the Gentoo bugtracker
> > (https://bugs.gentoo.org/821895) and a reversion patch is available
> > there for the time being.
> >
> > I understand that some of the encryption methods upon which the
> > original feature relied are to be removed and, as such, the ability to
> > mount these older shares was removed. This is sure to affect anyone
> > running older Windows virtual machines (or older, internally-visible
> > windows hosts) in addition to anyone attempting to connect to shares
> > from esoteric devices like mine.
> >
> > Whilst I understand the desire to clean up code and remove dead
> > branches, I'd really appreciate it if this particular feature remains
> > available either by kernel configuration (which suits me fine, but is
> > likely to be a hassle for anyone running a binary distribution) or via
> > boot parameters. In the mean-time, I'm updating my own sync software
> > to support this older device because if I can't sync media to the
> > player, the device is not very useful to me.
> >
> > Thanks
> > -d
>
>
>
> --
> Thanks,
>
> Steve


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