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# Copyright (c) 2003 Graham Barr, Djamel Boudjerda, Paul Connolly, Julian Onions and Nexor.
# All rights reserved. This program is free software; you can redistribute
# it and/or modify it under the same terms as Perl itself.
# See http://www.ietf.org/rfc/rfc2831.txt for details
package Authen::SASL::Perl::DIGEST_MD5;
use strict;
use vars qw($VERSION @ISA $CNONCE);
use Digest::MD5 qw(md5_hex md5);
$VERSION = "1.04";
@ISA = qw(Authen::SASL::Perl);
my %secflags = (
noplaintext => 1,
noanonymous => 1,
);
# some have to be quoted - some don't - sigh!
my %qdval; @qdval{qw(username authzid realm nonce cnonce digest-uri)} = ();
sub _order { 3 }
sub _secflags {
shift;
scalar grep { $secflags{$_} } @_;
}
sub mechanism { 'DIGEST-MD5' }
# no initial value passed to the server
sub client_start {
'';
}
sub client_step # $self, $server_sasl_credentials
{
my ($self, $challenge) = @_;
$self->{server_params} = \my %sparams;
# Parse response parameters
while($challenge =~ s/^(?:\s*,)?\s*(\w+)=("([^\\"]+|\\.)*"|[^,]+)\s*//) {
my ($k, $v) = ($1,$2);
if ($v =~ /^"(.*)"$/s) {
($v = $1) =~ s/\\//g;
}
$sparams{$k} = $v;
}
return $self->set_error("Bad challenge: '$challenge'")
if length $challenge;
return $self->set_error("Server does not support auth (qop = $sparams{'qop'})")
unless grep { /^auth$/ } split(/,/, $sparams{'qop'});
my %response = (
nonce => $sparams{'nonce'},
username => $self->_call('user'),
realm => $sparams{'realm'},
nonce => $sparams{'nonce'},
cnonce => md5_hex($CNONCE || join (":", $$, time, rand)),
'digest-uri' => $self->service . '/' . $self->host,
qop => 'auth',
nc => sprintf("%08d", ++$self->{nonce}{$sparams{'nonce'}}),
charset => $sparams{'charset'},
);
my $authzid = $self->_call('authname');
if (defined $authzid) {
$response{authzid} = $authzid;
}
my $serv_name = $self->_call('serv');
if (defined $serv_name) {
$response{'digest_uri'} .= '/' . $serv_name;
}
my $password = $self->_call('pass');
# Generate the response value
my $A1 = join (":",
md5(join (":", @response{qw(username realm)}, $password)),
@response{defined($authzid) ? qw(nonce cnonce authzid) : qw(nonce cnonce)}
);
my $A2 = "AUTHENTICATE:" . $response{'digest-uri'};
$A2 .= ":00000000000000000000000000000000"
if $response{'qop'} and $response{'qop'} =~ /^auth-(conf|int)$/;
$response{'response'} = md5_hex(
join (":", md5_hex($A1), @response{qw(nonce nc cnonce qop)}, md5_hex($A2))
);
join (",", map { _qdval($_, $response{$_}) } sort keys %response);
}
sub _qdval {
my ($k, $v) = @_;
if (!defined $v) {
return;
}
elsif (exists $qdval{$k}) {
$v =~ s/([\\"])/\\$1/g;
return qq{$k="$v"};
}
return "$k=$v";
}
1;
__END__
=head1 NAME
Authen::SASL::Perl::DIGEST_MD5 - Digest MD5 Authentication class
=head1 SYNOPSIS
use Authen::SASL qw(Perl);
$sasl = Authen::SASL->new(
mechanism => 'DIGEST-MD5',
callback => {
user => $user,
pass => $pass,
serv => $serv
},
);
=head1 DESCRIPTION
This method implements the client part of the DIGEST-MD5 SASL algorithm,
as described in RFC-2831.
This module only implements the I<auth> operation which offers authentication
but neither integrity protection not encryption.
=head2 CALLBACK
The callbacks used are:
=over 4
=item authname
The authorization id to use after successful authentication
=item user
The username to be used in the response
=item pass
The password to be used in the response
=item serv
The service name when authenticating to a replicated service
=back
=head1 SEE ALSO
L<Authen::SASL>,
L<Authen::SASL::Perl>
=head1 AUTHORS
Graham Barr, Djamel Boudjerda (NEXOR) Paul Connolly, Julian Onions (NEXOR)
Please report any bugs, or post any suggestions, to the perl-ldap mailing list
<perl-ldap-dev@perl.org>
=head1 COPYRIGHT
Copyright (c) 2003 Graham Barr, Djamel Boudjerda, Paul Connolly, Julian Onions
and Nexor.
All rights reserved. This program is free software; you can redistribute
it and/or modify it under the same terms as Perl itself.
=cut
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