How to have sshd log IP numbers instead of reverse lookups
list at museum.rain.com
Mon Nov 28 01:09:37 GMT 2005
On Sat, Nov 26, 2005 at 10:12:50AM -0500, Lowell Gilbert wrote:
> James Long <list at museum.rain.com> writes:
> > I was looking at /var/log/auth.log and saw an entry of the form:
> > Nov 24 18:41:37 ns sshd: error: PAM: authentication error for username from example.com
> > I wish to have an IP number logged where sshd has instead logged
> > 'example.com'
> > Reading sshd's man page and sshd_config's man page, I don't find any
> > way to control this.
> > Since 'example.com' could have multiple IP numbers, how can I change
> > sshd's configuration to log the IP number from whence the
> > authentication error originated?
> If I recall correctly, those messages should be associated with other
> messages about the host connecting, which would include the IP
My logs don't seem to support that. Here are consecutive lines from auth.log:
Nov 24 17:13:05 ns sshd: error: PAM: authentication error for user from localhost
Nov 24 17:13:06 ns last message repeated 2 times
Nov 24 17:13:41 ns sshd: error: PAM: authentication error for user from 10.75.200.249
Nov 24 17:13:45 ns last message repeated 2 times
Nov 24 18:41:37 ns sshd: error: PAM: authentication error for user from example.com
Nov 24 18:41:39 ns last message repeated 2 times
Nov 24 18:57:20 ns sshd: Accepted publickey for user from 10.75.200.249 port 52111 ssh2
Nov 24 18:58:12 ns sshd: Accepted publickey for user from 10.75.200.249 port 52612 ssh2
Nov 24 18:58:45 ns su: user to root on /dev/ttyp3
Here, "localhost" appears to come from my hosts file, as dig -x 127.0.0.1
returns a different result.
example.com appears to come from reverse DNS, as there is no reference to
example.com in my hosts file.
10.75.200.249 is an IP which does not have a PTR record and is not in my
Telnetting to the ssh port reveals this version string:
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