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Special Forums Cybersecurity SMTP Flooding - How can I stop it? Post 302157712 by zaroundus on Friday 11th of January 2008 06:57:41 PM
Old 01-11-2008
I ran a top to see running processes and it looks like qmail. Though I thought qmail used sendmail somehow. Could be wrong though.... I'm okay with UNIX but only mostly for web server things. (Apache, MySQL, PHP...) I'm new to security and mail server testing/repair/hardening so I'm at a standstill. I made a few changes to the sendmail.cf file and one of the qmail files to throttle the connection rate and to pause 5 seconds before returning GREET. After switching Port 25 back on today the relays are no longer being passed on (I think...). My SMTP server is still being bombarded with connection requests so I'm not sure if I've completely resolved this or if I need to look elsewhere for connection restrictions. The connection attempt rate has, at times, approached 1.07 connections per second!
 

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qmail-start(8)						      System Manager's Manual						    qmail-start(8)

NAME
qmail-start - turn on mail delivery SYNOPSIS
qmail-start [ defaultdelivery [ logger arg ... ] ] DESCRIPTION
qmail-start invokes qmail-send, qmail-lspawn, qmail-rspawn, and qmail-clean, under the proper uids and gids. These four daemons cooperate to deliver messages from the queue. qmail-start arranges for qmail-send's activity record to be sent to qmail-start's output. See qmail-log(5) for the format of the activity record. Other than this, qmail-start does not print anything, even on failure. If defaultdelivery is supplied, qmail-start passes it to qmail-lspawn. If logger is supplied, qmail-start invokes logger with the given arguments, and feeds qmail-send's activity record through logger. Environment variables given to qmail-start will eventually be passed on to qmail-local, so make sure to clean up the environment if you run qmail-start manually: # env - PATH="/var/lib/qmail/bin:$PATH" qmail-start ./Mailbox splogger qmail & (all on one line) Resource limits, controlling ttys, et al. are also passed from qmail-start to qmail-local. Note that qmail-send normally juggles several simultaneous deliveries. To reduce qmail-send's impact on other programs, you can run qmail- start with a low priority. SEE ALSO
logger(1), splogger(1), nice(1), qmail-log(5), qmail-local(8), qmail-clean(8), qmail-lspawn(8), qmail-rspawn(8), qmail-send(8) qmail-start(8)
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