Re: Re(2): [Assp-user] Blocking of spam bombs - how does this work?

[Robert O. <r....@it...>]

I posted the changes here in the forum. Since they utilize some =
"hardcoded" values instead of a nice configurable config-addition, it =
did not make it into the faq.=20

There are several adjustments that are VERY specific to your LDAP setup, =
like authenticating the query, the structure of your LDAP database or =
the field(s) that are checked for the address in question. If you are =
running ms-exchange in the background, the necessary changes should be =
quite simple. If you use a different LDAP server, you probably have to =
adjust the "filter" which requires detailed knowledge of the LDAP server =
and some testing with an external LDAP utility.

If someone gets this running with a different LDAP server, I would be =
interested in the required changes. Maybe we could make a more =
"automatic" determination.

Remember, if you change the code, you will probably redo the changes =
every time you update ASSP to another version.

I made that for the 1.0.8 version, but as far as I know the "localmail" =
procedure had not changed in 1.0.9, so I expect it should work with this =
release too. This procedure determines whether a given email address is =
to be considered "local", normally by checking against the =
"localdomains". You still need "localdomains" for email-interface and =
relay-checking, that is done elsewhere in the code.

Here it goes:

-=3D-=3D-=3D-=3D-
Add the following dependency on top of ASSP.PL

   use Net::LDAP; # do LDAP lookup of email addresses

In case the Net::LDAP library is not installed, it can be installed =
quickly
via the "PPM" command

  PPM install Net::LDAP
-=3D-=3D-=3D-=3D-
Locate the procedure "sub localmail" within ASSP source and replace the =
procedure with the following code
-=3D-=3D-=3D-=3D-
sub localmail {
 my $h=3Dshift;
 $h =3D $1 if $h=3D~/\@(.*)/;
 #print "h=3D$h ld=3D$localDomains ldf=3D$localDomainsFile\n";
=20
 # do LDAP lookup. If the LDAP server does nor run on "localhost", put =
your server name there
=20
 $ldap =3D Net::LDAP->new( 'localhost' );
=20
 # bind to a directory with dn and password
 # change 'cn=3Duser,cn=3DUsers,DC=3Dcompany,DC=3Dcom' to a valid user =
at your LDAP server
 # that is allowed to do such queries
 $mesg =3D $ldap->bind( 'cn=3Duser,cn=3DUsers,DC=3Dcompany,DC=3Dcom',
  password =3D> 'add your password here');

 # perform a search. We just check whether the lookup of the
 # email address returns "any result" or an error
 # "base" is the root, queries are done down the whole tree
 # "filter" defines the query. You must check what field(s) contain ALL =
relevant
 # email addresses and aliases. The query below works well with =
MS-Exchange 5.5/2K
 $mesg =3D $ldap->search( base   =3D> "DC=3Dcompany,DC=3Dcom",
  filter =3D> "(proxyaddresses=3Dsmtp:$1$h)",
  attrs =3D> ['mail']);
 $mesg->code && die $mesg->error;
=20
 $entry_count =3D $mesg->count;
=20
 # uncomment the last line to see the result on the screen (if visible)
 #print "LDAP search: $1$h returns: $entry_count entries\n";

 $mesg =3D $ldap->unbind;  # take down session

 return $entry_count
=20
 0;
}
-=3D-=3D-=3D-=3D-


----- Original Message -----=20
From: "ASSP" <as...@ew...>
To: <ass...@li...>
Sent: Wednesday, April 21, 2004 2:38 PM
Subject: Fwd: Re(2): [Assp-user] Blocking of spam bombs - how does this =
work?


ass...@li... on Montag, 19. April 2004 at 14:35 Uhr
+0100 wrote:
>I too had this problem and this was the reason for me to implement
>LDAP-Lookup in ASSP as my Exchange-Server did not check the invalid
>recipients until the entire message was read - and in turn wanted to
>send
>yet another NDR back.

Is there a chance to get your implementation of ldap lookup into assp?

greetings

--=20

Fritz Borgstedt - Chief Engineer, Unicorn
<fb...@iw...>,http://www.magicvillage.de



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