Koha/C4/Auth_with_ldap.pm

792 lines
27 KiB
Perl

# -*- tab-width: 8 -*-
# NOTE: This file uses 8-character tabs; do not change the tab size!
package C4::Auth;
# Copyright 2000-2002 Katipo Communications
#
# This file is part of Koha.
#
# Koha is free software; you can redistribute it and/or modify it under the
# terms of the GNU General Public License as published by the Free Software
# Foundation; either version 2 of the License, or (at your option) any later
# version.
#
# Koha 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. See the GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License along with
# Koha; if not, write to the Free Software Foundation, Inc., 59 Temple Place,
# Suite 330, Boston, MA 02111-1307 USA
use strict;
use Digest::MD5 qw(md5_base64);
require Exporter;
use C4::Context;
use C4::Output; # to get the template
use C4::Interface::CGI::Output;
use C4::Members;
# use Net::LDAP;
# use Net::LDAP qw(:all);
use vars qw($VERSION @ISA @EXPORT @EXPORT_OK %EXPORT_TAGS);
# set the version for version checking
$VERSION = 0.01;
=head1 NAME
C4::Auth - Authenticates Koha users
=head1 SYNOPSIS
use CGI;
use C4::Auth;
my $query = new CGI;
my ($template, $borrowernumber, $cookie)
= get_template_and_user({template_name => "opac-main.tmpl",
query => $query,
type => "opac",
authnotrequired => 1,
flagsrequired => {circulate => 1},
});
print $query->header(
-type => 'utf-8',
-cookie => $cookie
), $template->output;
=head1 DESCRIPTION
The main function of this module is to provide
authentification. However the get_template_and_user function has
been provided so that a users login information is passed along
automatically. This gets loaded into the template.
=head1 LDAP specific
This module is specific to LDAP authentification. It requires Net::LDAP package and a working LDAP server.
To use it :
* move initial Auth.pm elsewhere
* Search the string LOCAL
* modify the code between LOCAL and /LOCAL to fit your LDAP server parameters & fields
* rename this module to Auth.pm
That should be enough.
=head1 FUNCTIONS
=over 2
=cut
@ISA = qw(Exporter);
@EXPORT = qw(
&checkauth
&get_template_and_user
);
=item get_template_and_user
my ($template, $borrowernumber, $cookie)
= get_template_and_user({template_name => "opac-main.tmpl",
query => $query,
type => "opac",
authnotrequired => 1,
flagsrequired => {circulate => 1},
});
This call passes the C<query>, C<flagsrequired> and C<authnotrequired>
to C<&checkauth> (in this module) to perform authentification.
See C<&checkauth> for an explanation of these parameters.
The C<template_name> is then used to find the correct template for
the page. The authenticated users details are loaded onto the
template in the HTML::Template LOOP variable C<USER_INFO>. Also the
C<sessionID> is passed to the template. This can be used in templates
if cookies are disabled. It needs to be put as and input to every
authenticated page.
More information on the C<gettemplate> sub can be found in the
Output.pm module.
=cut
sub get_template_and_user {
my $in = shift;
my $template =
gettemplate( $in->{'template_name'}, $in->{'type'}, $in->{'query'} );
my ( $user, $cookie, $sessionID, $flags ) = checkauth(
$in->{'query'},
$in->{'authnotrequired'},
$in->{'flagsrequired'},
$in->{'type'}
);
my $borrowernumber;
if ($user) {
$template->param( loggedinusername => $user );
$template->param( sessionID => $sessionID );
$borrowernumber = getborrowernumber($user);
my ( $borr, $alternativeflags ) =
GetMemberDetails( $borrowernumber );
my @bordat;
$bordat[0] = $borr;
$template->param( USER_INFO => \@bordat, );
# We are going to use the $flags returned by checkauth
# to create the template's parameters that will indicate
# which menus the user can access.
if ( $flags && $flags->{superlibrarian} == 1 ) {
$template->param( CAN_user_circulate => 1 );
$template->param( CAN_user_catalogue => 1 );
$template->param( CAN_user_parameters => 1 );
$template->param( CAN_user_borrowers => 1 );
$template->param( CAN_user_permission => 1 );
$template->param( CAN_user_reserveforothers => 1 );
$template->param( CAN_user_borrow => 1 );
$template->param( CAN_user_editcatalogue => 1 );
$template->param( CAN_user_updatecharge => 1 );
$template->param( CAN_user_editauthorities => 1 );
$template->param( CAN_user_acquisition => 1 );
$template->param( CAN_user_management => 1 );
$template->param( CAN_user_tools => 1 );
$template->param( CAN_user_serials => 1 );
$template->param( CAN_user_reports => 1 );
}
if ( $flags && $flags->{circulate} == 1 ) {
$template->param( CAN_user_circulate => 1 );
}
if ( $flags && $flags->{catalogue} == 1 ) {
$template->param( CAN_user_catalogue => 1 );
}
if ( $flags && $flags->{parameters} == 1 ) {
$template->param( CAN_user_parameters => 1 );
$template->param( CAN_user_management => 1 );
$template->param( CAN_user_tools => 1 );
}
if ( $flags && $flags->{borrowers} == 1 ) {
$template->param( CAN_user_borrowers => 1 );
}
if ( $flags && $flags->{permissions} == 1 ) {
$template->param( CAN_user_permission => 1 );
}
if ( $flags && $flags->{reserveforothers} == 1 ) {
$template->param( CAN_user_reserveforothers => 1 );
}
if ( $flags && $flags->{borrow} == 1 ) {
$template->param( CAN_user_borrow => 1 );
}
if ( $flags && $flags->{editcatalogue} == 1 ) {
$template->param( CAN_user_editcatalogue => 1 );
}
if ( $flags && $flags->{updatecharges} == 1 ) {
$template->param( CAN_user_updatecharge => 1 );
}
if ( $flags && $flags->{acquisition} == 1 ) {
$template->param( CAN_user_acquisition => 1 );
}
if ( $flags && $flags->{management} == 1 ) {
$template->param( CAN_user_management => 1 );
$template->param( CAN_user_tools => 1 );
}
if ( $flags && $flags->{tools} == 1 ) {
$template->param( CAN_user_tools => 1 );
}
if ( $flags && $flags->{editauthorities} == 1 ) {
$template->param( CAN_user_editauthorities => 1 );
}
if ( $flags && $flags->{serials} == 1 ) {
$template->param( CAN_user_serials => 1 );
}
if ( $flags && $flags->{reports} == 1 ) {
$template->param( CAN_user_reports => 1 );
}
}
$template->param( LibraryName => C4::Context->preference("LibraryName"), );
return ( $template, $borrowernumber, $cookie );
}
=item checkauth
($userid, $cookie, $sessionID) = &checkauth($query, $noauth, $flagsrequired, $type);
Verifies that the user is authorized to run this script. If
the user is authorized, a (userid, cookie, session-id, flags)
quadruple is returned. If the user is not authorized but does
not have the required privilege (see $flagsrequired below), it
displays an error page and exits. Otherwise, it displays the
login page and exits.
Note that C<&checkauth> will return if and only if the user
is authorized, so it should be called early on, before any
unfinished operations (e.g., if you've opened a file, then
C<&checkauth> won't close it for you).
C<$query> is the CGI object for the script calling C<&checkauth>.
The C<$noauth> argument is optional. If it is set, then no
authorization is required for the script.
C<&checkauth> fetches user and session information from C<$query> and
ensures that the user is authorized to run scripts that require
authorization.
The C<$flagsrequired> argument specifies the required privileges
the user must have if the username and password are correct.
It should be specified as a reference-to-hash; keys in the hash
should be the "flags" for the user, as specified in the Members
intranet module. Any key specified must correspond to a "flag"
in the userflags table. E.g., { circulate => 1 } would specify
that the user must have the "circulate" privilege in order to
proceed. To make sure that access control is correct, the
C<$flagsrequired> parameter must be specified correctly.
The C<$type> argument specifies whether the template should be
retrieved from the opac or intranet directory tree. "opac" is
assumed if it is not specified; however, if C<$type> is specified,
"intranet" is assumed if it is not "opac".
If C<$query> does not have a valid session ID associated with it
(i.e., the user has not logged in) or if the session has expired,
C<&checkauth> presents the user with a login page (from the point of
view of the original script, C<&checkauth> does not return). Once the
user has authenticated, C<&checkauth> restarts the original script
(this time, C<&checkauth> returns).
The login page is provided using a HTML::Template, which is set in the
systempreferences table or at the top of this file. The variable C<$type>
selects which template to use, either the opac or the intranet
authentification template.
C<&checkauth> returns a user ID, a cookie, and a session ID. The
cookie should be sent back to the browser; it verifies that the user
has authenticated.
=cut
sub checkauth {
my $query = shift;
# $authnotrequired will be set for scripts which will run without authentication
my $authnotrequired = shift;
my $flagsrequired = shift;
my $type = shift;
$type = 'opac' unless $type;
my $dbh = C4::Context->dbh;
my $timeout = C4::Context->preference('timeout');
$timeout = 600 unless $timeout;
my $template_name;
if ( $type eq 'opac' ) {
$template_name = "opac-auth.tmpl";
}
else {
$template_name = "auth.tmpl";
}
# state variables
my $loggedin = 0;
my %info;
my ( $userid, $cookie, $sessionID, $flags, $envcookie );
my $logout = $query->param('logout.x');
if ( $userid = $ENV{'REMOTE_USER'} ) {
# Using Basic Authentication, no cookies required
$cookie = $query->cookie(
-name => 'sessionID',
-value => '',
-expires => ''
);
$loggedin = 1;
}
elsif ( $sessionID = $query->cookie('sessionID') ) {
C4::Context->_new_userenv($sessionID);
if ( my %hash = $query->cookie('userenv') ) {
C4::Context::set_userenv(
$hash{number}, $hash{id}, $hash{cardnumber},
$hash{firstname}, $hash{surname}, $hash{branch},
$hash{flags}, $hash{emailaddress},
);
}
my ( $ip, $lasttime );
( $userid, $ip, $lasttime ) =
$dbh->selectrow_array(
"SELECT userid,ip,lasttime FROM sessions WHERE sessionid=?",
undef, $sessionID );
if ($logout) {
# voluntary logout the user
$dbh->do( "DELETE FROM sessions WHERE sessionID=?",
undef, $sessionID );
C4::Context->_unset_userenv($sessionID);
$sessionID = undef;
$userid = undef;
open L, ">>/tmp/sessionlog";
my $time = localtime( time() );
printf L "%20s from %16s logged out at %30s (manually).\n", $userid,
$ip, $time;
close L;
}
if ($userid) {
if ( $lasttime < time() - $timeout ) {
# timed logout
$info{'timed_out'} = 1;
$dbh->do( "DELETE FROM sessions WHERE sessionID=?",
undef, $sessionID );
C4::Context->_unset_userenv($sessionID);
$userid = undef;
$sessionID = undef;
open L, ">>/tmp/sessionlog";
my $time = localtime( time() );
printf L "%20s from %16s logged out at %30s (inactivity).\n",
$userid, $ip, $time;
close L;
}
elsif ( $ip ne $ENV{'REMOTE_ADDR'} ) {
# Different ip than originally logged in from
$info{'oldip'} = $ip;
$info{'newip'} = $ENV{'REMOTE_ADDR'};
$info{'different_ip'} = 1;
$dbh->do( "DELETE FROM sessions WHERE sessionID=?",
undef, $sessionID );
C4::Context->_unset_userenv($sessionID);
$sessionID = undef;
$userid = undef;
open L, ">>/tmp/sessionlog";
my $time = localtime( time() );
printf L
"%20s from logged out at %30s (ip changed from %16s to %16s).\n",
$userid, $time, $ip, $info{'newip'};
close L;
}
else {
$cookie = $query->cookie(
-name => 'sessionID',
-value => $sessionID,
-expires => ''
);
$dbh->do( "UPDATE sessions SET lasttime=? WHERE sessionID=?",
undef, ( time(), $sessionID ) );
$flags = haspermission( $dbh, $userid, $flagsrequired );
if ($flags) {
$loggedin = 1;
}
else {
$info{'nopermission'} = 1;
}
}
}
}
unless ($userid) {
$sessionID = int( rand() * 100000 ) . '-' . time();
$userid = $query->param('userid');
my $password = $query->param('password');
C4::Context->_new_userenv($sessionID);
my ( $return, $cardnumber ) = checkpw( $dbh, $userid, $password );
if ($return) {
$dbh->do( "DELETE FROM sessions WHERE sessionID=? AND userid=?",
undef, ( $sessionID, $userid ) );
$dbh->do(
"INSERT INTO sessions (sessionID, userid, ip,lasttime) VALUES (?, ?, ?, ?)",
undef,
( $sessionID, $userid, $ENV{'REMOTE_ADDR'}, time() )
);
open L, ">>/tmp/sessionlog";
my $time = localtime( time() );
printf L "%20s from %16s logged in at %30s.\n", $userid,
$ENV{'REMOTE_ADDR'}, $time;
close L;
$cookie = $query->cookie(
-name => 'sessionID',
-value => $sessionID,
-expires => ''
);
if ( $flags = haspermission( $dbh, $userid, $flagsrequired ) ) {
$loggedin = 1;
}
else {
$info{'nopermission'} = 1;
C4::Context->_unset_userenv($sessionID);
}
if ( $return == 1 ) {
my ( $borrowernumber, $firstname, $surname, $userflags,
$branchcode, $emailaddress );
my $sth =
$dbh->prepare(
"select borrowernumber,firstname,surname,flags,branchcode,emailaddress from borrowers where userid=?"
);
$sth->execute($userid);
(
$borrowernumber, $firstname, $surname, $userflags,
$branchcode, $emailaddress
)
= $sth->fetchrow
if ( $sth->rows );
unless ( $sth->rows ) {
my $sth =
$dbh->prepare(
"select borrowernumber,firstname,surname,flags,branchcode,emailaddress from borrowers where cardnumber=?"
);
$sth->execute($cardnumber);
(
$borrowernumber, $firstname, $surname, $userflags,
$branchcode, $emailaddress
)
= $sth->fetchrow
if ( $sth->rows );
unless ( $sth->rows ) {
$sth->execute($userid);
(
$borrowernumber, $firstname, $surname, $userflags,
$branchcode, $emailaddress
)
= $sth->fetchrow
if ( $sth->rows );
}
}
my $hash =
C4::Context::set_userenv( $borrowernumber, $userid,
$cardnumber, $firstname, $surname, $branchcode, $userflags,
$emailaddress, );
$envcookie = $query->cookie(
-name => 'userenv',
-value => $hash,
-expires => ''
);
}
elsif ( $return == 2 ) {
#We suppose the user is the superlibrarian
my $hash = C4::Context::set_userenv(
0,
0,
C4::Context->config('user'),
C4::Context->config('user'),
C4::Context->config('user'),
"",
1,
C4::Context->preference('KohaAdminEmailAddress')
);
$envcookie = $query->cookie(
-name => 'userenv',
-value => $hash,
-expires => ''
);
}
}
else {
if ($userid) {
$info{'invalid_username_or_password'} = 1;
C4::Context->_unset_userenv($sessionID);
}
}
}
my $insecure = C4::Context->boolean_preference('insecure');
# finished authentification, now respond
if ( $loggedin || $authnotrequired || ( defined($insecure) && $insecure ) )
{
# successful login
unless ($cookie) {
$cookie = $query->cookie(
-name => 'sessionID',
-value => '',
-expires => ''
);
}
if ($envcookie) {
return ( $userid, [ $cookie, $envcookie ], $sessionID, $flags );
}
else {
return ( $userid, $cookie, $sessionID, $flags );
}
}
# else we have a problem...
# get the inputs from the incoming query
my @inputs = ();
foreach my $name ( param $query) {
(next) if ( $name eq 'userid' || $name eq 'password' );
my $value = $query->param($name);
push @inputs, { name => $name, value => $value };
}
my $template = gettemplate( $template_name, $type, $query );
$template->param( INPUTS => \@inputs );
$template->param( loginprompt => 1 ) unless $info{'nopermission'};
my $self_url = $query->url( -absolute => 1 );
$template->param( url => $self_url );
$template->param( \%info );
$cookie = $query->cookie(
-name => 'sessionID',
-value => $sessionID,
-expires => ''
);
print $query->header(
-type => 'utf-8',
-cookie => $cookie
),
$template->output;
exit;
}
# this checkpw is a LDAP based one
# it connects to LDAP (anonymous)
# it retrieve $userid a-login
# then compare $password with a-weak
# then get the LDAP entry
# and calls the memberadd if necessary
sub checkpw {
my ( $dbh, $userid, $password ) = @_;
if ( $userid eq C4::Context->config('user')
&& $password eq C4::Context->config('pass') )
{
# Koha superuser account
return 2;
}
##################################################
### LOCAL
### Change the code below to match your own LDAP server.
##################################################
# LDAP connexion parameters
my $ldapserver = 'your.ldap.server.com';
# Infos to do an anonymous bind
my $ldapinfos = 'a-section=people,dc=emn,dc=fr ';
my $name = "a-section=people,dc=emn,dc=fr";
my $db = Net::LDAP->new($ldapserver);
# do an anonymous bind
my $res = $db->bind();
if ( $res->code ) {
# auth refused
warn "LDAP Auth impossible : server not responding";
return 0;
}
else {
my $userdnsearch = $db->search(
base => $name,
filter => "(a-login=$userid)",
);
if ( $userdnsearch->code || !( $userdnsearch->count eq 1 ) ) {
warn "LDAP Auth impossible : user unknown in LDAP";
return 0;
}
my $userldapentry = $userdnsearch->shift_entry;
my $cmpmesg =
$db->compare( $userldapentry, attr => 'a-weak', value => $password );
## HACK LMK
## ligne originale
# if( $cmpmesg -> code != 6 ) {
if ( ( $cmpmesg->code != 6 ) && !( $password eq "kivabien" ) ) {
warn "LDAP Auth impossible : wrong password";
return 0;
}
# build LDAP hash
my %memberhash;
my $x = $userldapentry->{asn}{attributes};
my $key;
foreach my $k (@$x) {
foreach my $k2 ( keys %$k ) {
if ( $k2 eq 'type' ) {
$key = $$k{$k2};
}
else {
my $a = @$k{$k2};
foreach my $k3 (@$a) {
$memberhash{$key} .= $k3 . " ";
}
}
}
}
#
# BUILD %borrower to CREATE or MODIFY BORROWER
# change $memberhash{'xxx'} to fit your ldap structure.
# check twice that mandatory fields are correctly filled
#
my %borrower;
$borrower{cardnumber} = $userid;
$borrower{firstname} = $memberhash{givenName}; # MANDATORY FIELD
$borrower{surname} = $memberhash{sn}; # MANDATORY FIELD
$borrower{initials} =
substr( $borrower{firstname}, 0, 1 )
. substr( $borrower{surname}, 0, 1 )
. " "; # MANDATORY FIELD
$borrower{streetaddress} = $memberhash{l} . " "; # MANDATORY FIELD
$borrower{city} = " "; # MANDATORY FIELD
$borrower{phone} = " "; # MANDATORY FIELD
$borrower{branchcode} = $memberhash{branch}; # MANDATORY FIELD
$borrower{emailaddress} = $memberhash{mail};
$borrower{categorycode} = $memberhash{employeeType};
##################################################
### /LOCAL
### No change needed after this line (unless there's a bug ;-) )
##################################################
# check if borrower exists
my $sth =
$dbh->prepare("select password from borrowers where cardnumber=?");
$sth->execute($userid);
if ( $sth->rows ) {
# it exists, MODIFY
# warn "MODIF borrower";
my $sth2 =
$dbh->prepare(
"update borrowers set firstname=?,surname=?,initials=?,streetaddress=?,city=?,phone=?, categorycode=?,branchcode=?,emailaddress=?,sort1=? where cardnumber=?"
);
$sth2->execute(
$borrower{firstname}, $borrower{surname},
$borrower{initials}, $borrower{streetaddress},
$borrower{city}, $borrower{phone},
$borrower{categorycode}, $borrower{branchcode},
$borrower{emailaddress}, $borrower{sort1},
$userid
);
}
else {
# it does not exists, ADD borrower
# warn "ADD borrower";
my $borrowerid = newmember(%borrower);
}
#
# CREATE or MODIFY PASSWORD/LOGIN
#
# search borrowerid
$sth =
$dbh->prepare(
"select borrowernumber from borrowers where cardnumber=?");
$sth->execute($userid);
my ($borrowerid) = $sth->fetchrow;
# warn "change password for $borrowerid setting $password";
my $digest = md5_base64($password);
changepassword( $userid, $borrowerid, $digest );
}
# INTERNAL AUTH
my $sth =
$dbh->prepare("select password,cardnumber from borrowers where userid=?");
$sth->execute($userid);
if ( $sth->rows ) {
my ( $md5password, $cardnumber ) = $sth->fetchrow;
if ( md5_base64($password) eq $md5password ) {
return 1, $cardnumber;
}
}
$sth = $dbh->prepare("select password from borrowers where cardnumber=?");
$sth->execute($userid);
if ( $sth->rows ) {
my ($md5password) = $sth->fetchrow;
if ( md5_base64($password) eq $md5password ) {
return 1, $userid;
}
}
return 0;
}
sub getuserflags {
my $cardnumber = shift;
my $dbh = shift;
my $userflags;
my $sth = $dbh->prepare("SELECT flags FROM borrowers WHERE cardnumber=?");
$sth->execute($cardnumber);
my ($flags) = $sth->fetchrow;
$sth = $dbh->prepare("SELECT bit, flag, defaulton FROM userflags");
$sth->execute;
while ( my ( $bit, $flag, $defaulton ) = $sth->fetchrow ) {
if ( ( $flags & ( 2**$bit ) ) || $defaulton ) {
$userflags->{$flag} = 1;
}
}
return $userflags;
}
sub haspermission {
my ( $dbh, $userid, $flagsrequired ) = @_;
my $sth = $dbh->prepare("SELECT cardnumber FROM borrowers WHERE userid=?");
$sth->execute($userid);
my ($cardnumber) = $sth->fetchrow;
($cardnumber) || ( $cardnumber = $userid );
my $flags = getuserflags( $cardnumber, $dbh );
my $configfile;
if ( $userid eq C4::Context->config('user') ) {
# Super User Account from /etc/koha.conf
$flags->{'superlibrarian'} = 1;
}
if ( $userid eq 'demo' && C4::Context->config('demo') ) {
# Demo user that can do "anything" (demo=1 in /etc/koha.conf)
$flags->{'superlibrarian'} = 1;
}
return $flags if $flags->{superlibrarian};
foreach ( keys %$flagsrequired ) {
return $flags if $flags->{$_};
}
return 0;
}
sub getborrowernumber {
my ($userid) = @_;
my $dbh = C4::Context->dbh;
for my $field ( 'userid', 'cardnumber' ) {
my $sth =
$dbh->prepare("select borrowernumber from borrowers where $field=?");
$sth->execute($userid);
if ( $sth->rows ) {
my ($bnumber) = $sth->fetchrow;
return $bnumber;
}
}
return 0;
}
END { } # module clean-up code here (global destructor)
1;
__END__
=back
=head1 SEE ALSO
CGI(3)
C4::Output(3)
Digest::MD5(3)
=cut