[plug] Mail Filtering

[ryan at is.as.geeky.as]

How does such a procmail script confirm that the message REALLY came from
callen at corpus.wa.edu.au?

Anyone can send an email claiming that address.  If it doesn't have any
wacky-doo way of checking the sender, is putting some kind of 'secret' line
in the file and not parsing if it isn't found a good idea?  Or parse the
headers for the originating ip/hostname/etc (that has even more short-falls
though).

(I have no knowledge of procmail)

Ryan

----- Original Message -----
From: "I am the LinuxAlien" <linuxalien at optusnet.com.au>
To: <plug at plug.linux.org.au>
Sent: Wednesday, August 28, 2002 3:26 PM
Subject: [plug] Mail Filtering


> Ok, some time back I asked for help getting an  email to replace a file in
> my public-html folder. The solution is below.
> -------------------------------------
> #!/usr/bin/perl
>
> #read the _whole_ file from stdin into $_;
> undef $/;
> $_=<STDIN>;
>
> #get rid of the email headers
> # headers are seperated from the body of the message by a blank line.
> s/^.*?\n\n//gs;
>
> open(DATA, ">public_html/registered_names.txt") or
>          die "failed to open public_html/registered_names.txt: $!\n";
> print DATA $_;
> close(DATA);
> --------
>
> Then in ~/.procmailrc do something like:
> ---
> :0
> * ^From:.*callen at corpus.wa.edu.au
> | /path/to/script
> ---
<SNIP>
> I don't no how to script other than simple stuff.
> Thanks,
> Tim
>
>
> LinuxAlien
> Riverton, Perth, WA
>
> Australian Linux Technical Conference, Perth 2003 http://linux.conf.au