[Bug 2545] New: reverse DNS lookups shouldn't block login

bugzilla-daemon at bugzilla.mindrot.org bugzilla-daemon at bugzilla.mindrot.org
Sat Feb 27 03:33:50 AEDT 2016


            Bug ID: 2545
           Summary: reverse DNS lookups shouldn't block login
           Product: Portable OpenSSH
           Version: 6.6p1
          Hardware: All
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P5
         Component: sshd
          Assignee: unassigned-bugs at mindrot.org
          Reporter: bugzilla.mindrot.org at beej.org

sshd currently blocks on doing a reverse DNS lookup during login when
UseDNS is yes.  this normally doesn't present a problem, but broken or
misconfigured resolvers and servers can cause a 20-second penalty to
sshd users.

sshd should do the name resolution in a non-blocking way.

see https://bugs.launchpad.net/ubuntu/+source/openssh/+bug/424371

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