[Bug 218925] 800.loginfail needs more info on some ssh login failures

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=218925

            Bug ID: 218925
           Summary: 800.loginfail needs more info on some ssh login
                    failures
           Product: Base System
           Version: 11.0-STABLE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: bin
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: dwmcrobb at me.com

Created attachment 182143
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=182143&action=edit
patch to pick up more useful ssh login failure data from auth.log

I regularly get this kind of mail from the daily security run on public-facing
machines:

Apr 26 06:00:50 ria sshd[31509]: Disconnecting: Too many authentication
failures [preauth]
Apr 26 06:49:03 ria sshd[31583]: Disconnecting: Too many authentication
failures [preauth]
Apr 26 06:56:49 ria sshd[31627]: Disconnecting: Too many authentication
failures [preauth]
Apr 26 07:45:25 ria sshd[31715]: Disconnecting: Too many authentication
failures [preauth]
Apr 26 09:28:19 ria sshd[31890]: Disconnecting: Too many authentication
failures [preauth]
Apr 26 09:59:13 ria sshd[31952]: Disconnecting: Too many authentication
failures [preauth]
Apr 26 11:16:29 ria sshd[32092]: Disconnecting: Too many authentication
failures [preauth]
Apr 26 12:52:50 ria sshd[32457]: Disconnecting: Too many authentication
failures [preauth]
Apr 26 15:29:09 ria sshd[33415]: Disconnecting: Too many authentication
failures [preauth]

Not very helpful.  I should be seeing this:

Apr 26 06:00:50 ria sshd[31509]: error: maximum authentication attempts
exceeded for root from 188.187.52.118 port 49171 ssh2 [preauth]
Apr 26 06:00:50 ria sshd[31509]: Disconnecting: Too many authentication
failures [preauth]
Apr 26 06:49:03 ria sshd[31583]: error: maximum authentication attempts
exceeded for root from 87.198.39.108 port 45609 ssh2 [preauth]
Apr 26 06:49:03 ria sshd[31583]: Disconnecting: Too many authentication
failures [preauth]
Apr 26 06:56:49 ria sshd[31627]: error: maximum authentication attempts
exceeded for root from 190.216.171.66 port 39053 ssh2 [preauth]
Apr 26 06:56:49 ria sshd[31627]: Disconnecting: Too many authentication
failures [preauth]
Apr 26 07:45:25 ria sshd[31715]: error: maximum authentication attempts
exceeded for root from 62.20.61.178 port 40532 ssh2 [preauth]
Apr 26 07:45:25 ria sshd[31715]: Disconnecting: Too many authentication
failures [preauth]
Apr 26 09:28:19 ria sshd[31890]: error: maximum authentication attempts
exceeded for root from 112.250.104.128 port 43618 ssh2 [preauth]
Apr 26 09:28:19 ria sshd[31890]: Disconnecting: Too many authentication
failures [preauth]
Apr 26 09:59:13 ria sshd[31952]: error: maximum authentication attempts
exceeded for root from 202.100.182.254 port 54912 ssh2 [preauth]
Apr 26 09:59:13 ria sshd[31952]: Disconnecting: Too many authentication
failures [preauth]
Apr 26 11:16:29 ria sshd[32092]: error: maximum authentication attempts
exceeded for root from 71.227.146.158 port 60455 ssh2 [preauth]
Apr 26 11:16:29 ria sshd[32092]: Disconnecting: Too many authentication
failures [preauth]
Apr 26 12:52:50 ria sshd[32457]: error: maximum authentication attempts
exceeded for root from 77.37.232.131 port 39678 ssh2 [preauth]
Apr 26 12:52:50 ria sshd[32457]: Disconnecting: Too many authentication
failures [preauth]
Apr 26 15:29:09 ria sshd[33415]: error: maximum authentication attempts
exceeded for root from 78.194.25.54 port 49924 ssh2 [preauth]
Apr 26 15:29:09 ria sshd[33415]: Disconnecting: Too many authentication
failures [preauth]

Even better would be:

Apr 26 06:00:50 ria sshd[31509]: error: maximum authentication attempts
exceeded for root from 188.187.52.118 port 49171 ssh2 [preauth]
Apr 26 06:49:03 ria sshd[31583]: error: maximum authentication attempts
exceeded for root from 87.198.39.108 port 45609 ssh2 [preauth]
Apr 26 06:56:49 ria sshd[31627]: error: maximum authentication attempts
exceeded for root from 190.216.171.66 port 39053 ssh2 [preauth]
Apr 26 07:45:25 ria sshd[31715]: error: maximum authentication attempts
exceeded for root from 62.20.61.178 port 40532 ssh2 [preauth]
Apr 26 09:28:19 ria sshd[31890]: error: maximum authentication attempts
exceeded for root from 112.250.104.128 port 43618 ssh2 [preauth]
Apr 26 09:59:13 ria sshd[31952]: error: maximum authentication attempts
exceeded for root from 202.100.182.254 port 54912 ssh2 [preauth]
Apr 26 11:16:29 ria sshd[32092]: error: maximum authentication attempts
exceeded for root from 71.227.146.158 port 60455 ssh2 [preauth]
Apr 26 12:52:50 ria sshd[32457]: error: maximum authentication attempts
exceeded for root from 77.37.232.131 port 39678 ssh2 [preauth]
Apr 26 15:29:09 ria sshd[33415]: error: maximum authentication attempts
exceeded for root from 78.194.25.54 port 49924 ssh2 [preauth]

A minor change (attached) will at least get the lines that are useful (and also
the cruft but I can live with that), and I don't believe it will muck up the
recognition of other login failures.

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