1 package Koha::AuthUtils;
3 # Copyright 2013 Catalyst IT
5 # This file is part of Koha.
7 # Koha is free software; you can redistribute it and/or modify it
8 # under the terms of the GNU General Public License as published by
9 # the Free Software Foundation; either version 3 of the License, or
10 # (at your option) any later version.
12 # Koha is distributed in the hope that it will be useful, but
13 # WITHOUT ANY WARRANTY; without even the implied warranty of
14 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 # GNU General Public License for more details.
17 # You should have received a copy of the GNU General Public License
18 # along with Koha; if not, see <http://www.gnu.org/licenses>.
21 use Crypt::Eksblowfish::Bcrypt qw(bcrypt en_base64);
22 use Encode qw( encode is_utf8 );
23 use Fcntl qw/O_RDONLY/; # O_RDONLY is used in generate_salt
24 use List::MoreUtils qw/ any /;
28 our $VERSION = '1.01';
29 our @EXPORT_OK = qw(hash_password get_script_name);
33 Koha::AuthUtils - utility routines for authentication
37 use Koha::AuthUtils qw/hash_password/;
38 my $hash = hash_password($password);
42 This module provides utility functions related to managing
49 my $hash = Koha::AuthUtils::hash_password($password, $settings);
53 # Using Bcrypt method for hashing. This can be changed to something else in future, if needed.
56 $password = Encode::encode( 'UTF-8', $password )
57 if Encode::is_utf8($password);
59 # Generate a salt if one is not passed
61 unless( defined $settings ){ # if there are no settings, we need to create a salt and append settings
62 # Set the cost to 8 and append a NULL
63 $settings = '$2a$08$'.en_base64(generate_salt('weak', 16));
66 return bcrypt($password, $settings);
71 my $salt = Koha::Auth::generate_salt($strength, $length);
77 For general password salting a C<$strength> of C<weak> is recommend,
78 For generating a server-salt a C<$strength> of C<strong> is recommended
80 'strong' uses /dev/random which may block until sufficient entropy is acheived.
81 'weak' uses /dev/urandom and is non-blocking.
85 C<$length> is a positive integer which specifies the desired length of the returned string
92 # the implementation of generate_salt is loosely based on Crypt::Random::Provider::File
94 # strength is 'strong' or 'weak'
95 # length is number of bytes to read, positive integer
96 my ($strength, $length) = @_;
101 die "non-positive strength of '$strength' passed to Koha::AuthUtils::generate_salt\n";
104 if( $strength eq "strong" ){
105 $source = '/dev/random'; # blocking
107 unless( $strength eq 'weak' ){
108 warn "unsuppored strength of '$strength' passed to Koha::AuthUtils::generate_salt, defaulting to 'weak'\n";
110 $source = '/dev/urandom'; # non-blocking
113 sysopen SOURCE, $source, O_RDONLY
114 or die "failed to open source '$source' in Koha::AuthUtils::generate_salt\n";
116 # $bytes is the bytes just read
117 # $string is the concatenation of all the bytes read so far
118 my( $bytes, $string ) = ("", "");
120 # keep reading until we have $length bytes in $strength
121 while( length($string) < $length ){
122 # return the number of bytes read, 0 (EOF), or -1 (ERROR)
123 my $return = sysread SOURCE, $bytes, $length - length($string);
125 # if no bytes were read, keep reading (if using /dev/random it is possible there was insufficient entropy so this may block)
128 die "error while reading from $source in Koha::AuthUtils::generate_salt\n";
138 =head2 get_script_name
140 This returns the correct script name, for use in redirecting back to the correct page after showing
141 the login screen. It depends on details of the package Plack configuration, and should not be used
142 outside this context.
146 sub get_script_name {
147 # This is the method about.pl uses to detect Plack; now that two places use it, it MUST be
149 if ( ( any { /(^psgi\.|^plack\.)/i } keys %ENV ) && $ENV{SCRIPT_NAME} =~ m,^/(intranet|opac)(.*), ) {
150 return '/cgi-bin/koha' . $2;
152 return $ENV{SCRIPT_NAME};
162 Crypt::Eksblowfish::Bcrypt(3)