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package Fripost::Password;
use 5.010_000;
use strict;
=head1 NAME
Password.pm - Generate passwords
=cut
our $VERSION = '0.02';
use Exporter;
use MIME::Base64;
use String::MkPasswd qw/mkpasswd/;
use constant {
CLEARTEXT => 0,
CRYPT => 1,
MD5 => 2,
SHA1 => 3,
};
our @EXPORT = qw/hash CLEARTEXT CRYPT MD5 SHA1 mkpasswd/;
our @ISA = qw(Exporter);
# Hashes the given password using the given hashing function and salt.
# If the scheme is `undef', the best available one (currently SHA-1) is
# chosen.
# If `$salt' is the empty string, no salt is used (unless the scheme is
# CRYPT - since it requires salt).
# If `$salt' is `undef', the salt is automatically generated, using the
# subroutine `&make_salt' below.
sub hash {
my ($pw, $h, $salt) = @_;
$h //= SHA1;
# Treat the schemes that don't use Digest::.. separetely.
if ( $h == CLEARTEXT ) {
return $pw;
}
elsif ( $h == CRYPT ) {
$salt = &make_salt() if not (defined $salt) or $salt eq '';
$salt = sprintf ( '$1$%.8s', MIME::Base64::encode( $salt ) );
return '{CRYPT}' . crypt( $pw, $salt );
}
$salt //= &make_salt();
my $hash_function;
my $str;
if ( $h == MD5 ) {
use Digest::MD5 qw /md5/;
$hash_function = "Digest::MD5::md5";
$str = 'MD5';
$str = 'SMD5' if &is_salted( $salt );
}
elsif ( $h == SHA1 ) {
use Digest::SHA qw /sha1/;
$hash_function = "Digest::SHA::sha1";
$str = 'SHA';
$str = 'SSHA' if &is_salted( $salt );
}
else {
die "Error: Unknown scheme `" .$h. "'.\n";
}
no strict "refs";
return '{' .$str. '}' .
pad_base64( MIME::Base64::encode( &$hash_function( $pw . $salt ) . $salt
, '' ) );
}
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;
}
# Our policy for automatically generated passwords.
sub mkpasswd {
return String::MkPasswd::mkpasswd(
-length => 12,
-minnum => 2,
-minspecial => 1
);
}
=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 of Password.pm
__END__
|
