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Top Forums UNIX for Advanced & Expert Users Brute force SMTP attack right now *help* Post 302263054 by research3 on Sunday 30th of November 2008 01:33:34 PM
Old 11-30-2008
You can try to install denyhosts.
The tool check the auth.log and drop the session from the source IP.
If the source IP tried more then 3 failed login.
 

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Authen::Simple::SMTP(3pm)				User Contributed Perl Documentation				 Authen::Simple::SMTP(3pm)

NAME
Authen::Simple::SMTP - Simple SMTP authentication SYNOPSIS
use Authen::Simple::SMTP; my $smtp = Authen::Simple::FTP->new( host => 'smtp.company.com' ); if ( $smtp->authenticate( $username, $password ) ) { # successfull authentication } # or as a mod_perl Authen handler PerlModule Authen::Simple::Apache PerlModule Authen::Simple::SMTP PerlSetVar AuthenSimpleSMTP_host "smtp.company.com" <Location /protected> PerlAuthenHandler Authen::Simple::SMTP AuthType Basic AuthName "Protected Area" Require valid-user </Location> DESCRIPTION
Authenticate against a SMTP service. METHODS
* new This method takes a hash of parameters. The following options are valid: * host Connection host, can be a hostname or IP number. Defaults to "localhost". host => 'ftp.company.com' host => '10.0.0.1' * port Connection port, default to 25. port => 25 * timeout Connection timeout, defaults to 60. timeout => 60 * log Any object that supports "debug", "info", "error" and "warn". log => Log::Log4perl->get_logger('Authen::Simple::SMTP') * authenticate( $username, $password ) Returns true on success and false on failure. SEE ALSO
Authen::Simple. Net::SMTP. AUTHOR
Christian Hansen "ch@ngmedia.com" COPYRIGHT
This program is free software, you can redistribute it and/or modify it under the same terms as Perl itself. perl v5.8.8 2008-03-01 Authen::Simple::SMTP(3pm)
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