[Bug 3853] Potential Match User block evasion for kerberos realm users

[bugzilla-daemon at mindrot.org]

https://bugzilla.mindrot.org/show_bug.cgi?id=3853

Damien Miller <djm at mindrot.org> changed:

           What    |Removed                     |Added
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                 CC|                            |djm at mindrot.org

--- Comment #1 from Damien Miller <djm at mindrot.org> ---
sshd can't really do anything to fix this because sshd isn't aware of
stuff beneath the POSIX pwd.h API.

One thing you can do is to ban usernames in non-standard forms using
more Match rules, e.g.

> Match user *\\*
>    RefuseConnection yes

Ideally your NSS configuration (or whatever you're using to connect to
AD) would have an option to only accept names in a canonical form. sshd
is not the only software that can get bitten by this.

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