481 lines
14 KiB
Perl
481 lines
14 KiB
Perl
# -*- tab-width: 8 -*-
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# NOTE: This file uses 8-character tabs; do not change the tab size!
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package C4::Auth;
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# Copyright 2000-2002 Katipo Communications
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#
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# This file is part of Koha.
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#
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# Koha is free software; you can redistribute it and/or modify it under the
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# terms of the GNU General Public License as published by the Free Software
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# Foundation; either version 2 of the License, or (at your option) any later
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# version.
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#
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# Koha is distributed in the hope that it will be useful, but WITHOUT ANY
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# WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
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# A PARTICULAR PURPOSE. See the GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License along with
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# Koha; if not, write to the Free Software Foundation, Inc., 59 Temple Place,
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# Suite 330, Boston, MA 02111-1307 USA
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use strict;
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use Digest::MD5 qw(md5_base64);
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require Exporter;
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use C4::Context;
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use C4::Output; # to get the template
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use C4::Interface::CGI::Output;
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use C4::Circulation::Circ2; # getpatroninformation
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use Net::LDAP;
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use Net::LDAP qw(:all);
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use vars qw($VERSION @ISA @EXPORT @EXPORT_OK %EXPORT_TAGS);
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# set the version for version checking
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$VERSION = 0.01;
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=head1 NAME
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C4::Auth - Authenticates Koha users
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=head1 SYNOPSIS
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use CGI;
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use C4::Auth;
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my $query = new CGI;
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my ($template, $borrowernumber, $cookie)
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= get_template_and_user({template_name => "opac-main.tmpl",
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query => $query,
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type => "opac",
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authnotrequired => 1,
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flagsrequired => {borrow => 1},
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});
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print $query->header(
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-type => guesstype($template->output),
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-cookie => $cookie
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), $template->output;
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=head1 DESCRIPTION
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The main function of this module is to provide
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authentification. However the get_template_and_user function has
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been provided so that a users login information is passed along
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automatically. This gets loaded into the template.
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=head1 FUNCTIONS
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=over 2
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=cut
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@ISA = qw(Exporter);
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@EXPORT = qw(
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&checkauth
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&get_template_and_user
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);
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=item get_template_and_user
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my ($template, $borrowernumber, $cookie)
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= get_template_and_user({template_name => "opac-main.tmpl",
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query => $query,
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type => "opac",
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authnotrequired => 1,
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flagsrequired => {borrow => 1},
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});
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This call passes the C<query>, C<flagsrequired> and C<authnotrequired>
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to C<&checkauth> (in this module) to perform authentification.
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See C<&checkauth> for an explanation of these parameters.
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The C<template_name> is then used to find the correct template for
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the page. The authenticated users details are loaded onto the
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template in the HTML::Template LOOP variable C<USER_INFO>. Also the
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C<sessionID> is passed to the template. This can be used in templates
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if cookies are disabled. It needs to be put as and input to every
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authenticated page.
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More information on the C<gettemplate> sub can be found in the
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Output.pm module.
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=cut
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sub get_template_and_user {
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my $in = shift;
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my $template = gettemplate($in->{'template_name'}, $in->{'type'});
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my ($user, $cookie, $sessionID, $flags)
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= checkauth($in->{'query'}, $in->{'authnotrequired'}, $in->{'flagsrequired'}, $in->{'type'});
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my $borrowernumber;
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if ($user) {
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$template->param(loggedinusername => $user);
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$template->param(sessionID => $sessionID);
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$borrowernumber = getborrowernumber($user);
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my ($borr, $flags) = getpatroninformation(undef, $borrowernumber);
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my @bordat;
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$bordat[0] = $borr;
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$template->param(USER_INFO => \@bordat);
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}
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return ($template, $borrowernumber, $cookie);
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}
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=item checkauth
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($userid, $cookie, $sessionID) = &checkauth($query, $noauth, $flagsrequired, $type);
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Verifies that the user is authorized to run this script. If
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the user is authorized, a (userid, cookie, session-id, flags)
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quadruple is returned. If the user is not authorized but does
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not have the required privilege (see $flagsrequired below), it
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displays an error page and exits. Otherwise, it displays the
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login page and exits.
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Note that C<&checkauth> will return if and only if the user
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is authorized, so it should be called early on, before any
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unfinished operations (e.g., if you've opened a file, then
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C<&checkauth> won't close it for you).
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C<$query> is the CGI object for the script calling C<&checkauth>.
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The C<$noauth> argument is optional. If it is set, then no
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authorization is required for the script.
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C<&checkauth> fetches user and session information from C<$query> and
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ensures that the user is authorized to run scripts that require
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authorization.
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The C<$flagsrequired> argument specifies the required privileges
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the user must have if the username and password are correct.
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It should be specified as a reference-to-hash; keys in the hash
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should be the "flags" for the user, as specified in the Members
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intranet module. Any key specified must correspond to a "flag"
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in the userflags table. E.g., { circulate => 1 } would specify
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that the user must have the "circulate" privilege in order to
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proceed. To make sure that access control is correct, the
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C<$flagsrequired> parameter must be specified correctly.
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The C<$type> argument specifies whether the template should be
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retrieved from the opac or intranet directory tree. "opac" is
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assumed if it is not specified; however, if C<$type> is specified,
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"intranet" is assumed if it is not "opac".
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If C<$query> does not have a valid session ID associated with it
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(i.e., the user has not logged in) or if the session has expired,
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C<&checkauth> presents the user with a login page (from the point of
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view of the original script, C<&checkauth> does not return). Once the
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user has authenticated, C<&checkauth> restarts the original script
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(this time, C<&checkauth> returns).
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The login page is provided using a HTML::Template, which is set in the
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systempreferences table or at the top of this file. The variable C<$type>
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selects which template to use, either the opac or the intranet
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authentification template.
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C<&checkauth> returns a user ID, a cookie, and a session ID. The
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cookie should be sent back to the browser; it verifies that the user
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has authenticated.
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=cut
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sub checkauth {
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my $query=shift;
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# $authnotrequired will be set for scripts which will run without authentication
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my $authnotrequired = shift;
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my $flagsrequired = shift;
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my $type = shift;
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$type = 'opac' unless $type;
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my $dbh = C4::Context->dbh;
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my $timeout = C4::Context->preference('timeout');
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$timeout = 600 unless $timeout;
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my $template_name;
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if ($type eq 'opac') {
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$template_name = "opac-auth.tmpl";
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} else {
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$template_name = "auth.tmpl";
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}
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# state variables
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my $loggedin = 0;
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my %info;
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my ($userid, $cookie, $sessionID, $flags);
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my $logout = $query->param('logout.x');
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if ($userid = $ENV{'REMOTE_USER'}) {
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# Using Basic Authentication, no cookies required
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$cookie=$query->cookie(-name => 'sessionID',
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-value => '',
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-expires => '');
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$loggedin = 1;
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} elsif ($sessionID=$query->cookie('sessionID')) {
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my ($ip , $lasttime);
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($userid, $ip, $lasttime) = $dbh->selectrow_array(
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"SELECT userid,ip,lasttime FROM sessions WHERE sessionid=?",
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undef, $sessionID);
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if ($logout) {
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# voluntary logout the user
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$dbh->do("DELETE FROM sessions WHERE sessionID=?", undef, $sessionID);
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$sessionID = undef;
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$userid = undef;
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open L, ">>/tmp/sessionlog";
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my $time=localtime(time());
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printf L "%20s from %16s logged out at %30s (manually).\n", $userid, $ip, $time;
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close L;
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}
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if ($userid) {
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if ($lasttime<time()-$timeout) {
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# timed logout
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$info{'timed_out'} = 1;
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$dbh->do("DELETE FROM sessions WHERE sessionID=?", undef, $sessionID);
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$userid = undef;
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$sessionID = undef;
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open L, ">>/tmp/sessionlog";
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my $time=localtime(time());
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printf L "%20s from %16s logged out at %30s (inactivity).\n", $userid, $ip, $time;
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close L;
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} elsif ($ip ne $ENV{'REMOTE_ADDR'}) {
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# Different ip than originally logged in from
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$info{'oldip'} = $ip;
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$info{'newip'} = $ENV{'REMOTE_ADDR'};
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$info{'different_ip'} = 1;
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$dbh->do("DELETE FROM sessions WHERE sessionID=?", undef, $sessionID);
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$sessionID = undef;
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$userid = undef;
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open L, ">>/tmp/sessionlog";
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my $time=localtime(time());
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printf L "%20s from logged out at %30s (ip changed from %16s to %16s).\n", $userid, $time, $ip, $info{'newip'};
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close L;
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} else {
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$cookie=$query->cookie(-name => 'sessionID',
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-value => $sessionID,
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-expires => '');
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$dbh->do("UPDATE sessions SET lasttime=? WHERE sessionID=?",
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undef, (time(), $sessionID));
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$flags = haspermission($dbh, $userid, $flagsrequired);
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if ($flags) {
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$loggedin = 1;
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} else {
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$info{'nopermission'} = 1;
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}
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}
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}
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}
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unless ($userid) {
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$sessionID=int(rand()*100000).'-'.time();
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$userid=$query->param('userid');
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my $password=$query->param('password');
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my ($return, $cardnumber) = checkpw($dbh,$userid,$password);
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if ($return) {
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$dbh->do("DELETE FROM sessions WHERE sessionID=? AND userid=?",
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undef, ($sessionID, $userid));
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$dbh->do("INSERT INTO sessions (sessionID, userid, ip,lasttime) VALUES (?, ?, ?, ?)",
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undef, ($sessionID, $userid, $ENV{'REMOTE_ADDR'}, time()));
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open L, ">>/tmp/sessionlog";
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my $time=localtime(time());
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printf L "%20s from %16s logged in at %30s.\n", $userid, $ENV{'REMOTE_ADDR'}, $time;
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close L;
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$cookie=$query->cookie(-name => 'sessionID',
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-value => $sessionID,
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-expires => '');
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if ($flags = haspermission($dbh, $userid, $flagsrequired)) {
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$loggedin = 1;
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} else {
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$info{'nopermission'} = 1;
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}
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} else {
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if ($userid) {
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$info{'invalid_username_or_password'} = 1;
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}
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}
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}
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my $insecure = C4::Context->boolean_preference('insecure');
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# finished authentification, now respond
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if ($loggedin || $authnotrequired || (defined($insecure) && $insecure)) {
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# successful login
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unless ($cookie) {
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$cookie=$query->cookie(-name => 'sessionID',
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-value => '',
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-expires => '');
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}
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return ($userid, $cookie, $sessionID, $flags);
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}
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# else we have a problem...
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# get the inputs from the incoming query
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my @inputs =();
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foreach my $name (param $query) {
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(next) if ($name eq 'userid' || $name eq 'password');
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my $value = $query->param($name);
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push @inputs, {name => $name , value => $value};
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}
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my $template = gettemplate($template_name, $type);
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$template->param(INPUTS => \@inputs);
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$template->param(loginprompt => 1) unless $info{'nopermission'};
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my $self_url = $query->url(-absolute => 1);
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$template->param(url => $self_url);
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$template->param(\%info);
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$cookie=$query->cookie(-name => 'sessionID',
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-value => $sessionID,
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-expires => '');
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print $query->header(
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-type => guesstype($template->output),
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-cookie => $cookie
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), $template->output;
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exit;
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}
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sub checkpw {
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# This should be modified to allow a selection of authentication schemes
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# (e.g. LDAP), as well as local authentication through the borrowers
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# tables passwd field
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#
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my ($dbh, $userid, $password) = @_;
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# LDAP
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my $sth=$dbh->prepare("select value from systempreferences where variable=?");
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$sth->execute("ldapserver");
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my $ldapserver = C4::Context->preferences('ldapserver');
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if ($ldapserver) {
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my $ldapinfos = C4::Context->preferences('ldapinfos');
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my %bindargs;
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my $nom = "uid=$userid, $ldapinfos";
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my $db = Net::LDAP->new( $ldapserver );
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$bindargs{dn}=$nom;
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$bindargs{password}=$password;
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my $res =$db->bind(%bindargs);
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if($res->code) {
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# auth refused
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return 0;
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} else {
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#get the cardnumber
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my $sth=$dbh->prepare("select cardnumber from borrowers where userid=?");
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$sth->execute($userid);
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if ($sth->rows) {
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my $cardnumber = $sth->fetchrow;
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#we have the cardnumber
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return 1,$cardnumber;
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}
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if ($userid eq C4::Context->config('user') && $password eq C4::Context->config('pass')) {
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# Koha superuser account
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return 2;
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}
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}
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# INTERNAL AUTH
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my $sth=$dbh->prepare("select password,cardnumber from borrowers where userid=?");
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$sth->execute($userid);
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if ($sth->rows) {
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my ($md5password,$cardnumber) = $sth->fetchrow;
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if (md5_base64($password) eq $md5password) {
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return 1,$cardnumber;
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}
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}
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my $sth=$dbh->prepare("select password from borrowers where cardnumber=?");
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$sth->execute($userid);
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if ($sth->rows) {
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my ($md5password) = $sth->fetchrow;
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if (md5_base64($password) eq $md5password) {
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return 1,$userid;
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}
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}
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if ($userid eq C4::Context->config('user') && $password eq C4::Context->config('pass')) {
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# Koha superuser account
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return 2;
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}
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if ($userid eq 'demo' && $password eq 'demo' && C4::Context->config('demo')) {
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# DEMO => the demo user is allowed to do everything (if demo set to 1 in koha.conf
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# some features won't be effective : modify systempref, modify MARC structure,
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return 2;
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}
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return 0;
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}
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sub getuserflags {
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my $cardnumber=shift;
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my $dbh=shift;
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my $userflags;
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my $sth=$dbh->prepare("SELECT flags FROM borrowers WHERE cardnumber=?");
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$sth->execute($cardnumber);
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my ($flags) = $sth->fetchrow;
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$sth=$dbh->prepare("SELECT bit, flag, defaulton FROM userflags");
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$sth->execute;
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while (my ($bit, $flag, $defaulton) = $sth->fetchrow) {
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if (($flags & (2**$bit)) || $defaulton) {
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$userflags->{$flag}=1;
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}
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}
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return $userflags;
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}
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sub haspermission {
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my ($dbh, $userid, $flagsrequired) = @_;
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my $sth=$dbh->prepare("SELECT cardnumber FROM borrowers WHERE userid=?");
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$sth->execute($userid);
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my ($cardnumber) = $sth->fetchrow;
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($cardnumber) || ($cardnumber=$userid);
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my $flags=getuserflags($cardnumber,$dbh);
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my $configfile;
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if ($userid eq C4::Context->config('user')) {
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# Super User Account from /etc/koha.conf
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$flags->{'superlibrarian'}=1;
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}
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if ($userid eq 'demo' && C4::Context->config('demo')) {
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# Demo user that can do "anything" (demo=1 in /etc/koha.conf)
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$flags->{'superlibrarian'}=1;
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}
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return $flags if $flags->{superlibrarian};
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foreach (keys %$flagsrequired) {
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return $flags if $flags->{$_};
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}
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return 0;
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}
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sub getborrowernumber {
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my ($userid) = @_;
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my $dbh = C4::Context->dbh;
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for my $field ('userid', 'cardnumber') {
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my $sth=$dbh->prepare
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("select borrowernumber from borrowers where $field=?");
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$sth->execute($userid);
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if ($sth->rows) {
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my ($bnumber) = $sth->fetchrow;
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return $bnumber;
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}
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}
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return 0;
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}
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END { } # module clean-up code here (global destructor)
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1;
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__END__
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=back
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=head1 SEE ALSO
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CGI(3)
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C4::Output(3)
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Digest::MD5(3)
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=cut
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