06-18-2007
Wrapper script
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LEARN ABOUT DEBIAN
mail::milter::wrapper::decodesrs
Mail::Milter::Wrapper::DecodeSRS(3pm) User Contributed Perl Documentation Mail::Milter::Wrapper::DecodeSRS(3pm)
NAME
Mail::Milter::Wrapper::DecodeSRS - milter wrapper to decode SRS-encoded return path
SYNOPSIS
use Mail::Milter::Wrapper::DecodeSRS;
my $milter = ...;
my $wrapper = new Mail::Milter::Wrapper::DecodeSRS($milter);
my $wrapper2 = &DecodeSRS($milter); # convenience
DESCRIPTION
Mail::Milter::Wrapper::DecodeSRS is a convenience milter wrapper which decodes MAIL FROM: return paths which have been encoded by the
Sender Rewrite Scheme, SRS. (More information: http://www.libsrs2.org/) This wrapper internally understands both the SRS0 and SRS1 encod-
ing schemes documented by the Mail::SRS author.
The decoded address is made available to the contained milter via the "envfrom" callback, in the same way that a raw address would.
NOTE: If the address is not SRS encoded, the contained milter is NOT called for the duration of the message; instead, SMFIS_ACCEPT is
returned. This is because the milter writer is expected to use this wrapper in a chain that also includes the contained milter without
wrapping, in order to prevent a malicious sender from using SRS to bypass access checks.
For instance, the following is a proper usage of this wrapper in a chain:
my $envfrommilter = ...;
my $combinedmilter = new Mail::Milter::Chain(
new Mail::Milter::Wrapper::UnwrapSRS($envfrommilter),
$envfrommilter
);
This behavior can also be used if, e.g., the MTA already does one form of MAIL FROM: check, and the contained milter repeats that same
database check against SRS rewritten addresses. (A good example would be a milter emulating Sendmail's access_db map.)
AUTHOR
Todd Vierling, <tv@duh.org> <tv@pobox.com>
SEE ALSO
Mail::Milter::Wrapper
perl v5.8.8 2004-02-26 Mail::Milter::Wrapper::DecodeSRS(3pm)