[Bug 720] "UseDNS no" breaks public key login

[bugzilla-daemon at mindrot.org]

http://bugzilla.mindrot.org/show_bug.cgi?id=720

           Summary: "UseDNS no" breaks public key login
           Product: Portable OpenSSH
           Version: -current
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P2
         Component: sshd
        AssignedTo: openssh-bugs at mindrot.org
        ReportedBy: wsanders1 at yahoo.com


Setting "UseDNS no" as a temporary workaround for a host that does not have PTR
record breaks public key login for all hosts, even if they have valid, matching
A and PTR records. A message is logged to syslog: "sshd[1235]: Authentication
tried for <user> with correct key but not from a permitted host
(host=XXX.XXX.XXX.XXX, ip=XXX.XXX.XXX.XXX)." Host at IP XXX.XXX.XXX.XXX is a
host that is previously able to login when UseDNS is set to "yes". 

If this is not the intent of the UseDNS option



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