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Subject: [Bug 204475] security/openssh-portable: documentation: fully
 disabling password authentication
Date: Wed, 11 Nov 2015 18:01:16 +0000
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X-Bugzilla-Product: Ports & Packages
X-Bugzilla-Component: Individual Port(s)
X-Bugzilla-Version: Latest
X-Bugzilla-Keywords: 
X-Bugzilla-Severity: Affects Some People
X-Bugzilla-Who: Mark.Martinec@ijs.si
X-Bugzilla-Status: New
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X-Bugzilla-Assigned-To: bdrewery@FreeBSD.org
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=204475

            Bug ID: 204475
           Summary: security/openssh-portable: documentation: fully
                    disabling password authentication
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: Individual Port(s)
          Assignee: bdrewery@FreeBSD.org
          Reporter: Mark.Martinec@ijs.si
             Flags: maintainer-feedback?(bdrewery@FreeBSD.org)
          Assignee: bdrewery@FreeBSD.org

When installing the openssh-portable (7.1.p1_2,1) the following
advice is displayed:

  [...]
  Users are encouraged to create single-purpose users with ssh keys, disable
  Password auth with 'PasswordAuthentication no' and define very narrow sudo
  privileges instead of using root for automated tasks.

which is half-true / misleading.

Actually it is necessary to also set:

  ChallengeResponseAuthentication no

otherwise the PAM mechanism will still allow authentication
through a password if authentication with a key fails,
leaving a host open to password-guessing attacks.

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