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Mail::DKIM::AuthorDomainPolicy(3)    User Contributed Perl Documentation   Mail::DKIM::AuthorDomainPolicy(3)



NAME
       Mail::DKIM::AuthorDomainPolicy - represents an Author Domain Signing Practices (ADSP) record

DESCRIPTION
       The Author Domain Signing Policies (ADSP) record can be published by any domain to help a receiver
       know what to do when it encounters an unsigned message claiming to originate from that domain.

       The record is published as a DNS TXT record at _adsp._domainkey.DOMAIN where DOMAIN is the domain of
       the message's "From" address.

       More details about this record can be found by reading the specification itself at
       <http://tools.ietf.org/html/rfc5617>.

CONSTRUCTORS
   fetch()
       Lookup an ADSP record in DNS.

         my $policy = Mail::DKIM::AuthorDomainPolicy->fetch(
                   Protocol => "dns",
                   Author => 'jsmith@example.org',
                 );

       If the ADSP record is found and appears to be valid, an object containing that record's information
       will be constructed and returned.  If the ADSP record is blank or simply does not exist, an object
       representing the default policy will be returned instead.  (See also "is_implied_default_policy()".)
       If a DNS error occurs (e.g. SERVFAIL or time-out), this method will "die".

   new()
       Construct a default policy object.

         my $policy = Mail::DKIM::AuthorDomainPolicy->new;

   parse()
       Construct an ADSP record from a string.

         my $policy = Mail::DKIM::AuthorDomainPolicy->parse(
                 String => "dkim=all",
                 Domain => "aaa.example",
             );

METHODS
   apply()
       Apply the policy to the results of a DKIM verifier.

         my $result = $policy->apply($dkim_verifier);

       The caller must provide an instance of Mail::DKIM::Verifier, one which has already been fed the
       message being verified.

       Possible results are:

       accept
           The message is approved by the sender signing policy.

       reject
           The message is rejected by the sender signing policy.  It can be considered very suspicious.

       neutral
           The message is neither approved nor rejected by the sender signing policy. It can be considered
           somewhat suspicious.

       Note: in the future, these values may become:
        none - no ADSP record is published
        pass - a passing signature is present
        fail - ADSP record is "all" and no passing signature is found
        discard - ADSP record is "discardable" and no passing signature is found
        nxdomain - the DNS domain does not exist
        temperror - transient error occurred
        permerror - non-transient error occurred

   is_implied_default_policy()
       Tells whether this policy implied.

         my $is_implied = $policy->is_implied_default_policy;

       If you fetch the policy for a particular domain, but that domain does not have a policy published,
       then the "default policy" is in effect. Use this method to detect when that happens.

   location()
       Tells where the policy was fetched from.

       If the policy is domain-wide, this will be domain where the policy was published.

       If the policy is user-specific, TBD.

       If nothing is published for the domain, and the default policy was returned instead, the location
       will be "undef".

   policy()
       Get or set the outbound signing policy (dkim=) tag.

         my $sp = $policy->policy;

       Outbound signing policy for the entity. Possible values are:

       "unknown"
           The default. The entity may sign some or all email.

       "all"
           All mail from the domain is expected to be signed, using a valid Author signature, but the author
           does not suggest discarding mail without a valid signature.

       "discardable"
           All mail from the domain is expected to be signed, using a valid Author signature, and the author
           is so confident that non-signed mail claiming to be from this domain can be automatically
           discarded by the recipient's mail server.

       "NXDOMAIN"
           The domain is out of scope, i.e., the domain does not exist in the DNS.

   signall()
       True if policy is "all".

   signall_discardable()
       True if policy is "strict".

BUGS
       •   Section 4.3 of the specification says to perform a query on the domain itself just to see if it
           exists. This class is not currently doing that, i.e. it might report NXDOMAIN because
           _adsp._domainkey.example.org is nonexistent, but it should not be treated the same as example.org
           being nonexistent.

AUTHOR
       Jason Long, <jlong@messiah.edu>

COPYRIGHT AND LICENSE
       Copyright (C) 2006-2009 by Messiah College

       This library is free software; you can redistribute it and/or modify it under the same terms as Perl
       itself, either Perl version 5.8.6 or, at your option, any later version of Perl 5 you may have
       available.



perl v5.16.2                                     2010-01-23                Mail::DKIM::AuthorDomainPolicy(3)