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package Fripost::Password;
use 5.010_000;
use strict;
use warnings;
=head1 NAME
Password.pm - Hash and generate passwords
=cut
our $VERSION = '0.02';
use Exporter 'import';
use String::MkPasswd;
use Digest::SHA;
use MIME::Base64;
our @EXPORT_OK = qw/hash pwgen/;
=head1 FUNCTIONS
=over 4
=item B<hash> ([I<salt>])
SHA-1 hash the given password. I<salt>, if defined and not empty, is
used to salt the password. If I<salt> is not defined, a random 4 bytes
salt is used. If I<salt> is the empty string, the hash is not salted.
The used scheme precedes the hash, so the output is ready to be inserted
in a LDAP entry for instance.
=cut
sub hash {
my ($pw, $salt) = @_;
$salt //= &_make_salt();
my $str = 'SHA';
$str = 'SSHA' if &_is_salted( $salt );
{ no strict "refs";
$str = '{' .$str. '}' .
&_pad_base64( MIME::Base64::encode(
Digest::SHA::sha1( $pw.$salt ) . $salt,
'' ) );
};
return $str;
}
sub _is_salted { return ( not ( defined $_[0] ) or $_[0] ne '' ) };
# Generate a (random) 4 bytes salt. We only generates 4 bytes here to
# match the other way to hash & salt passwords (`slappasswd' and the
# RoundCube passwords).
sub _make_salt {
my $len = 4;
my @bytes = ();
for my $i ( 1 .. $len ) {
push( @bytes, rand(255) );
}
return pack( 'C*', @bytes );
}
# Add trailing `='s to the input string to ensure its length is a
# multiple of 4.
sub _pad_base64 {
my $b64_digest = shift;
while ( length($b64_digest) % 4 ) {
$b64_digest .= '=';
}
return $b64_digest;
}
=item B<pwgen>
Generate a random password that complies to B<Fripost>'s password
policy.
=cut
sub pwgen {
return String::MkPasswd::mkpasswd(
-length => 12,
-minnum => 2,
-minspecial => 1
);
}
=back
=cut
=head1 AUTHORS
Stefan Kangas C<< <skangas at skangas.se> >>
Guilhem Moulin C<< <guilhem at fripost.org> >>
=head1 BUGS
Please report any bugs to C<< <skangas at skangas.se> >>
=head1 COPYRIGHT
Copyright (c) 2010 Dominik Schulz (dominik.schulz@gauner.org). All rights reserved.
Copyright 2010,2011 Stefan Kangas, all rights reserved.
Copyright 2012 Guilhem Moulin, all rights reserved.
=head1 LICENSE
This program is free software; you can redistribute it and/or modify it under
the same terms as Perl itself.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
=cut
1;
__END__
|
