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# Copyright (c) 2004 Peter Marschall <peter@adpm.de>. All rights reserved.
# This program is free software; you can redistribute it and/or
# modify it under the same terms as Perl itself.

=head1 NAME

Authen::SASL::Perl -- Perl implementation of the SASL Authentication framework

=head1 SYNOPSIS

use Authen::SASL qw(Perl);

$sasl = Authen::SASL->new(
   mechanism => 'CRAM-MD5 PLAIN ANONYMOUS',
   callback => {
     user => $user,
     pass => \&fetch_password
   }
 );

=head1 DESCRIPTION

B<Authen::SASL::Perl> is the pure Perl implementation of SASL mechanisms
in the B<Authen::SASL> framework.

At the time of this writing it provides the client part implementation
for the following SASL mechanisms:

=over 4

=item ANONYMOUS

The Anonymous SASL Mechanism as defined in RFC 2245 resp. 
in IETF Draft draft-ietf-sasl-anon-03.txt from February 2004
provides a method to anonymously access internet services.

Since it does no authentication it does not need to send 
any confidential information such as passwords in plain text
over the network.

=item CRAM-MD5

The CRAM-MD5 SASL Mechanism as defined in RFC2195 resp.
in IETF Draft draft-ietf-sasl-crammd5-XX.txt
offers a simple challenge-response authentication mechanism.

Since it is a challenge-response authentication mechanism
no passwords are transferred in clear-text over the wire.

Due to the simplicity of the protocol CRAM-MD5 is susceptible
to replay and dictionary attacks, so DIGEST-MD5 should be used
in preferrence.

=item DIGEST-MD5

The DIGEST-MD5 SASL Mechanism as defined in RFC 2831 resp.
in IETF Draft draft-ietf-sasl-rfc2831bis-XX.txt
offers the HTTP Digest Access Authentication as SASL mechanism.

Like CRAM-MD5 it is a challenge-response authentication
method that does not send plain text passwords over the network.

Compared to CRAM-MD5, DIGEST-MD5 prevents chosen plaintext
attacks, and permits the use of third party authentication servers,
so that it is recommended to use DIGEST-MD5 instead of CRAM-MD5
when possible.

=item EXTERNAL

The EXTERNAL SASL mechanism as defined in RFC 2222
allows the use of external authentication systems as SASL mechanisms.

=item GSSAPI

The GSSAPI SASL mechanism as defined in RFC 2222 resp. IETF Draft
draft-ietf-sasl-gssapi-XX.txt allows using the Generic Security Service
Application Program Interface [GSSAPI] KERBEROS V5 as as SASL mechanism.

Although GSSAPI is a general mechanism for authentication it is almost
exlusively used for Kerberos 5.

=item LOGIN

The LOGIN SASL Mechanism as defined in IETF Draft
draft-murchison-sasl-login-XX.txt allows  the
combination of username and clear-text password to be used
in a SASL mechanism.

It does does not provide a security layer and sends the credentials
in clear over the wire.
Thus this mechanism should not be used without adequate security
protection.

=item PLAIN

The Plain SASL Mechanism as defined in RFC 2595 resp. IETF Draft
draft-ietf-sasl-plain-XX.txt is another SASL mechanism that allows
username and clear-text password combinations in SASL environments.

Like LOGIN it sends the credentials in clear over the network
and should not be used without sufficient security protection.

=back

As for server support, only I<PLAIN>, I<LOGIN> and I<DIGEST-MD5> are supported
at the time of this writing.

C<server_new> OPTIONS is a hashref that is only relevant for I<DIGEST-MD5> for
now and it supports the following options:

=over 4

=item - no_integrity

=item - no_confidentiality

=back

which configures how the security layers are negotiated with the client (or
rather imposed to the client).

=head1 SEE ALSO

L<Authen::SASL>,
L<Authen::SASL::Perl::ANONYMOUS>,
L<Authen::SASL::Perl::CRAM_MD5>,
L<Authen::SASL::Perl::DIGEST_MD5>,
L<Authen::SASL::Perl::EXTERNAL>,
L<Authen::SASL::Perl::GSSAPI>,
L<Authen::SASL::Perl::LOGIN>,
L<Authen::SASL::Perl::PLAIN>

=head1 AUTHOR

Peter Marschall <peter@adpm.de>

Please report any bugs, or post any suggestions, to the perl-ldap mailing list
<perl-ldap@perl.org>

=head1 COPYRIGHT

=cut

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