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Perl System Mail


I am trying to write a perl script, it send's mail to a user i used system(mail -s test) and also send some messages using this.

but my issue is i receive mail with html code like <br> and so..

how to get a plain mail using this system command.


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I tried to install some software but I got this message:
Checking for perl modulesfailed

You need to install the LWP perl module (libwww-perl) to install ...

Does any one know how I can install this module or is it better to install/update the whole sets of perl module?

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Deny Perl In Public Folders
How do you guys deny run of perl/bash scripts from /tmp, /var/tmp, /dev/shm? I've tried to build simple shell wrapper, but that's not a compromise if you run for example spamassassin on the same server (it needs direct io to/from perl binary). I'm looking intro some kind of binary wrapper or patch that will deny running perl scripts from public folders (also the same for shell scripts will be great). Any ideas or solutions?

If anyone interested in primitive shell wrapper code:

Code:
#!/bin/sh
ARGS=`echo $@ | grep -v "/tmp/"`
if [ "$ARGS" != "" ]; then
/usr/bin/perl.orig $ARGS;
fi

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How To Install Perl-XML-Parser
i've to install perl-XML-Parser on my dedicated server. i'm using centOS4.5. i tried

Code:
yum install perl-XML-Parser
after that command i got:


Code:
Setting up Install Process
Setting up repositories
Reading repository metadata in from local files
Excluding Packages in global exclude list
Finished
Parsing package install arguments
No Match for argument: perl-XML-Parser
Nothing to do

if anyone asks why i've to install it, i want to install VNC. while installing gnome with that command:

Code:
yum install gnome*
i got that error :

Code:
--> Running transaction check
--> Processing Dependency: perl-XML-Parser for package: intltool
--> Finished Dependency Resolution
Error: Missing Dependency: perl-XML-Parser is needed by package intltool

so, i think that i've to install perl-XML-Parser. but how?

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How Can Save My Server From Shells Perl
for save my server from perl shells , many hakers can haked by cgi-telnet & r57 shell with perl how can save perl without stop it because if i stop it cpanels was disabled any one have any way to save my server from shell perl?

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Perl Processess On A Cpanel Server
Its a cpanel server with latest version.

I have been noticing that several perl process are running most of the times which takes a lot CPU resource percentage, The server wads deployed som 5 months back but i have been noticing these perl processess from like 10-15 days, it looks like this

PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
31097 nobody 25 0 7188 3284 1176 R 46 0.2 1322:57 perl
25122 nobody 25 0 8988 4104 1160 R 45 0.2 620:22.34 perl
28144 nobody 25 0 7852 3712 1232 R 34 0.2 600:18.11 perl
6878 nobody 25 0 9316 4064 1104 R 33 0.2 1007:38 perl
25120 nobody 25 0 8980 4068 1128 R 33 0.2 623:28.04 perl
8263 nobody 15 0 8496 4308 1260 S 2 0.2 0:28.21 perl

What should i do to close them all and to make them occur not anymore, I dont think there is any perl based script working on the server. Not even much PHP based functionalit, Only static HTML pages.

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DoS + This Perl Script I Wrote...
I'm nearly at my wits end with this.

My server keeps going down lately, and I suspect some kind of DoS. Whenever it does, sometimes I can even watch it happen. Such as:

Quote:

80 requests currently being processed, 0 idle workers

WWWWWWWWWWWWWWWWWWKWWWWWWWWWWWWWWWWWWWKWWWWWWWWWWWWWWCWWWWWWCWWW
WWWWWWCWKWWWWWWW

I watched it fill up like that, from my NORMAL status:

Quote:

13.8 requests/sec - 33.6 kB/second - 2484 B/request
22 requests currently being processed, 36 idle workers

___K__C____CC__C_C_____.C_C____C_CC_K___K_K_KKK__KCKK__W___.....
................

That's what it usually looks like. Anyway, more and more Ws were added in a matter of seconds as I watched it. Next thing, my site doesn't load, and it goes dead. My TimeOut in apache was set to 5 seconds. Now it's at 2, though. I do have keep alive on, but it is VERY low, like its set to 2 seconds and the max keep alives is set to 15 or so.

I have been working on even just catching who is doing this for about 2 weeks now, trying everything to my ability. Here is everything from start to finish:

1. First I tried mod_evasive - this program seems worthless, it doesn't ever detect anything. I can post settings if need be, but ive played with it and it just doesn't work well I find. I have more trouble with it getting false positives. Also, I tried going over the apache logs. For me, this has been a nightmare because its just so hard to see between attackers and non attackers... and i've come up with nothing.

2. I tried APF with AntiDOS but it didn't seem to do anything...

3. I read about DDoS deflate by medialayer, and installed it and gave it a shot. It didn't do anything for me. I tried poking around with the command they have on their website and I found the results quite weird, it didnt show me all of the IPs like it was supposed to, but rather some mess like:

Code:
1 (ip here)
3 (ip here)
9
(1 addres
ses)
So I did more searches online, and eventually came across this command:

Code:
netstat -ntu | grep ':' | awk '{print $5}' | awk '{sub("::ffff:","");print}' | cut -f1 -d ':' | sort | uniq -c | sort -nr
This seemed nice, looked like it was working as it should this time. I used the test.pl ( my only test for this, I have trouble finding other tools )that comes with mod_evasive and sure enough it showed connections by me in there about like 150 or so after. I thought, 'hey thats pretty good, now ill try to make a script to parse it.' I did this, and then croned the script to run every minute.

Then I asked a friend of mine who I know has a better "DoS"er (though won't give it to anyone, understandably) to test the defence. It didn't hold up well at all. He suggested making the script run in an infinite loop instead of a cron, and make it sleep in the loop forever.

I did just that, and it now runs every 5 seconds. Here is the script, it's not the best, but it's all I've got now:

Code:
#!/usr/bin/perl

# Dos

use IO::Socket;
my $command;

for (my $i=0; 1; $i++) {
$command = `netstat -ntu | grep ':' | awk '{print $5}' | awk '{sub("::ffff:","");print}' | cut -f1 -d ':' | sort | uniq -c | sort -nr`;

@lines = split /
/, $command;
foreach my $line (@lines)
{
@twospleet = split(" ", $line);
if($twospleet[0] > 150) {
if($twospleet[1] != "") {
$carp=$twospleet[1];
$carp2=$twospleet[0];
$block = "/usr/local/sbin/apf -d $carp $carp2";
system($block);
}
}
}
sleep(5);
}

This actually worked; he started his attack, it found his IP, and he was blocked, and I didn't go down. The netstat command showed him in with some 200 something connections before he was blocked.

I was not able to see if this was effective against this issue until today, haven't been hit for 4 days now or so (perhaps some sort of easter vacation?). Today though, I watched the same thing happen again, filled to the brim with Ws.

The netstat command I found doesn't seem to be helping me here. If I am correct:

W means Sending Reply, according to the server status page. So what's going on here, someones making lots of connections and my system can't send a reply back for some reason?

My main questions are,

1. Am I right, that this is some kind of DoS?

2. If yes, how is this being done? And are there any test scripts available that I can download and try on myself to watch the statistics & test some more?

3. And again, how can I go about detecting whatever this is? Maybe some better netstat command, or something I can look for on the command page?

4. Is there any way to improve my perl script to protect against this?

5. If it isn't a DoS attack, what else might it be?

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Perl Filter Strange Error
I have a very strange error with mod_ext_filter (apache 2.2/php5.2.4)

Filter is defined with

ExtFilterDefine output_filter mode=output intype=text/html
outtype=text/html cmd="path_to_filter_file"

and called with

<Directory "/home/users/">
SetOutputFilter output_filter

filter file
------
use strict;
$_ = join('',<STDIN>);
$_=$_.'test';
print $_;
--------------

And now the problem. I want to automatically add extra html code with this
filter. On most sites working fine without problem. PhpBB3 working just fine, for example.

But on other php scripts like vBulletin, SMF, Nuke, IPB it brokes entire site.

IE6 have unterminable refreshes, IE7 displays an error page, Firefox retunrs a blank page if extra code is placed on header. With Opera errors are minimal but sometimes it displays some strange code.

These errors are only related to vBulletin, SMF, Nuke, IPB and few others.

Removing this line
$_=$_.'test';

everything is back to the normal without extra code

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Mail Proxy: How To Stop CGI Mail Proxies
During last week, two of our clients' accounts got compromised (most probably due to weak passwords) and there was a CGI script installed which started sending emails to more than 200,000 email accounts. This email addresses were stored in a text file.

By the time we noticed this activity, our server got black listed on major RBLs like Barracuda, SpamCop, Spamhaus etc and it took around 2 days to cleanup

3 days later, another account compromised with same *thing* and it really is pain in the arse now dealing with this and angry clients

We've already implemented a policy to restrict users to send 100 messages/per hour/domain which is working, but it seems this *thing* bypass exim.

I guess this Open Proxy Servers a Source of Spam is what i want to explain!

So my question is, if I've understood this right, is it possible to stop scripts like this or can we enforce mailman to use exim all the time to send messages and stop direct-mailing?

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Php Mail Unable To Connect To Mail.userdomain.com:25
Warning: fsockopen() [function.fsockopen]: unable to connect to mail.userdomain.com:25 (Connection timed out) in /home/user/public_html/_inc/class.smtp5.php on line 122
Message could not be sent. Mailer Error: Language string failed to load: connect_host

Using php 5 with phpsuexec enabled.

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Mail Server - Setup Virtual Mail Boxes
AMD Athlon54 X2 512Kx2 socket AM2 3800
slamd64-11.0

Just completed installing the captioned OS with everything installed except GAME. This is an experiment. slamd64 is now running on the box.

I'm going to setup virtual mail boxes on this server, allowing my friends using the mail server sending and receiving mails. Please advise;

1) how to check whether sendmail is running and configured properly.
2) how to setup virtual mail boxes. Where can I find relevant tutorial.

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[cPanel] Function Mail(); And Fowarders E-mail - Not Working
I have problem:
1. Function mail(); not working

2. osCommerce e-mail error:

Code:
Gid 32157 is not permitted to relay mail, or has directly called /usr/sbin/exim instead of /usr/sbin/sendmail.

3. Fowarders working only on internal accounts e-mail
fowarder@mydomain.com --> email@mydomain.com - working
fowarder@mydomain.com --> my-emiail123@mail.pl - not working

This is VPS cPanel (OpenVZ) on my dedicated server.

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Separate Mail Server- Deliver Mail To Hotmail
i'm thinking about building a separate mail server away from my cpanel/whm machine. that mail server will be located on a different IP address with "clean" record so that business email won't get deleted my strict rules of hotmail.

can you please tell me, generally, about this "buidling separate mail server", i.e. what MTA, software, web-mail software, will it be worth? ,etc. Pointing me in the right direction will allow me to complete the project in the shortest time.

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Error 500 While Loading Perl File
We have a perl script that is located under cgi-bin/yabb/

Everytime it's loaded is causing an error 500, suexec logs shows everything correct but error_log shows this: ...

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Pervent User To Run Perl File
How can pervent users ro run scripts start with #!/usr/bin/perl in anywhere.

Its a big security issue for run shell.

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Installed Imagemagick Perl Module But Its Not Running
I have installed image::magick perl module but its not running error is :--

Can't load '/usr/lib/perl5/site_perl/5.8.8/i386-linux-thread-multi/auto/Image/Magick/Magick.so' for module Image::Magick: libMagickCore.so.1: cannot open shared object file: No such file or directory at /usr/lib/perl5/5.8.8/i386-linux-thread-multi/DynaLoader.pm line 230.
at flickr.pl line 55
Compilation failed in require at flickr.pl line 55.
BEGIN failed--compilation aborted at flickr.pl line 55.

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