312 lines
10 KiB
Perl
312 lines
10 KiB
Perl
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 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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$query = new CGI;
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($userid, $cookie, $sessionID) = &checkauth($query);
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=head1 DESCRIPTION
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This module provides authentication for Koha users.
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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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);
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=item checkauth
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($userid, $cookie, $sessionID) = &checkauth($query, $noauth);
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Verifies that the user is authorized to run this script. Note that
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C<&checkauth> will return if and only if the user is authorized, so it
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should be called early on, before any unfinished operations (i.e., if
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you've opened a file, then C<&checkauth> won't close it for you).
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C<$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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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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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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#'
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# FIXME - (Or rather, proofreadme)
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# As I understand it, the 'sessionqueries' table in the Koha database
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# is supposed to save state while the user authenticates. If
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# (re-)authentication is required, &checkauth saves the browser's
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# original call to a new entry in sessionqueries, then presents a form
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# for the user to authenticate. Once the user has authenticated
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# visself, &checkauth retrieves the stored information from
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# sessionqueries and allows the original request to proceed.
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#
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# One problem, however, is that sessionqueries only stores the URL,
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# not the various values passed along from an HTML form. Thus, if the
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# request came from a form and contains information on stuff to change
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# (e.g., modify the contents of a virtual bookshelf), but the session
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# has timed out, then when &checkauth finally allows the request to
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# proceed, it will not contain the user's modifications. This is bad.
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#
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# Another problem is that entries in sessionqueries are supposed to be
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# temporary, but there's no mechanism for removing them in case of
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# error (e.g., the user can't remember vis password and walks away, or
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# if the user's machine crashes in the middle of authentication).
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#
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# Perhaps a better implementation would be to use $query->param to get
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# the parameter with which the original script was invoked, and pass
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# that along through all of the authentication pages. That way, all of
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# the pertinent information would be preserved, and the sessionqueries
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# table could be removed.
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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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if (my $userid=$ENV{'REMOTE_USERNAME'}) {
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# Using Basic Authentication, no cookies required
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my $cookie=$query->cookie(-name => 'sessionID',
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-value => '',
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-expires => '+1y');
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return ($userid, $cookie, '');
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}
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# Get session ID from cookie.
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my $sessionID=$query->cookie('sessionID');
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# FIXME - Error-checking: if the user isn't allowing cookies,
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# $sessionID will be undefined. Don't confuse this with an
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# expired cookie.
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my $message='';
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# Make sure the session ID is (still) good.
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my $dbh = C4::Context->dbh;
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my $sth=$dbh->prepare("select userid,ip,lasttime from sessions where sessionid=?");
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$sth->execute($sessionID);
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if ($sth->rows) {
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my ($userid, $ip, $lasttime) = $sth->fetchrow;
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# FIXME - Back door for tonnensen
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if ($lasttime<time()-45 && $userid ne 'tonnesen') {
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# This session has been inactive for >45 seconds, and
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# doesn't belong to user tonnensen. It has expired.
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$message="You have been logged out due to inactivity.";
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# Remove this session ID from the list of active sessions.
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# FIXME - Ought to have a cron job clean this up as well.
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my $sti=$dbh->prepare("delete from sessions where sessionID=?");
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$sti->execute($sessionID);
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# Add an entry to sessionqueries, so that we can restart
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# the script once the user has authenticated.
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my $scriptname=$ENV{'SCRIPT_NAME'}; # FIXME - Unused
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my $selfurl=$query->self_url();
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$sti=$dbh->prepare("insert into sessionqueries (sessionID, userid, value) values (?, ?, ?)");
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$sti->execute($sessionID, $userid, $selfurl);
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# Log the fact that someone tried to use an expired session ID.
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# FIXME - Ought to have a better logging mechanism,
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# ideally some wrapper that logs either to a
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# user-specified file, or to syslog, as determined by
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# either an entry in /etc/koha.conf, or a system
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# preference.
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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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# This session is coming from an IP address other than the
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# one where it was set. The user might be doing something
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# naughty.
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my $newip=$ENV{'REMOTE_ADDR'};
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$message="ERROR ERROR ERROR ERROR<br>Attempt to re-use a cookie from a different ip address.<br>(authenticated from $ip, this request from $newip)";
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} else {
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# This appears to be a valid session. Update the time
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# stamp on it and return.
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my $cookie=$query->cookie(-name => 'sessionID',
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-value => $sessionID,
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-expires => '+1y');
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my $sti=$dbh->prepare("update sessions set lasttime=? where sessionID=?");
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$sti->execute(time(), $sessionID);
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return ($userid, $cookie, $sessionID);
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}
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}
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# If we get this far, it's because we haven't received a cookie
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# with a valid session ID. Need to start a new session and set a
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# new cookie.
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if ($authnotrequired) {
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# This script doesn't require the user to be logged in. Return
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# just the cookie, without user ID or session ID information.
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my $cookie=$query->cookie(-name => 'sessionID',
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-value => '',
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-expires => '+1y');
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return('', $cookie, '');
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} else {
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# This script requires authorization. Assume that we were
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# given user and password information; generate a new session.
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# Generate a new session ID.
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($sessionID) || ($sessionID=int(rand()*100000).'-'.time());
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my $userid=$query->param('userid');
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my $password=$query->param('password');
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if (checkpw($dbh, $userid, $password)) {
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# The given password is valid
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# Delete any old copies of this session.
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my $sti=$dbh->prepare("delete from sessions where sessionID=? and userid=?");
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$sti->execute($sessionID, $userid);
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# Add this new session to the 'sessions' table.
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$sti=$dbh->prepare("insert into sessions (sessionID, userid, ip,lasttime) values (?, ?, ?, ?)");
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$sti->execute($sessionID, $userid, $ENV{'REMOTE_ADDR'}, time());
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# See if there's an entry for this session ID and user in
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# the 'sessionqueries' table. If so, then use that entry
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# to generate an HTTP redirect that'll take the user to
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# where ve wanted to go in the first place.
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$sti=$dbh->prepare("select value from sessionqueries where sessionID=? and userid=?");
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# FIXME - There is no sessionqueries.value
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$sti->execute($sessionID, $userid);
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if ($sti->rows) {
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my $stj=$dbh->prepare("delete from sessionqueries where sessionID=?");
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$stj->execute($sessionID);
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my ($selfurl) = $sti->fetchrow;
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print $query->redirect($selfurl);
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exit;
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}
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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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my $cookie=$query->cookie(-name => 'sessionID',
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-value => $sessionID,
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-expires => '+1y');
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return ($userid, $cookie, $sessionID);
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} else {
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# Either we weren't given a user id and password, or else
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# the password was invalid.
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if ($userid) {
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$message="Invalid userid or password entered.";
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}
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my $parameters;
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foreach (param $query) {
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$parameters->{$_}=$query->{$_};
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}
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my $cookie=$query->cookie(-name => 'sessionID',
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-value => $sessionID,
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-expires => '+1y');
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return ("",$cookie,$sessionID);
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}
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}
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}
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# checkpw
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# Takes a database handle, user ID, and password, and verifies that
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# the password is good. The user ID may be either a user ID or a card
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# number.
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# Returns 1 if the password is good, or 0 otherwise.
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sub checkpw {
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# This should be modified to allow a select of authentication schemes (ie LDAP)
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# as well as local authentication through the borrowers tables passwd field
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#
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my ($dbh, $userid, $password) = @_;
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my $sth;
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# Try the user ID.
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$sth = $dbh->prepare("select password from borrowers where userid=?");
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$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 $md5password) {
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return 1; # The password matches
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}
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}
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# Try the card number.
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$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 $md5password) {
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return 1; # The password matches
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}
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}
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if ($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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return 0; # Either there's no such user, or the password
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# doesn't match.
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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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Digest::MD5(3)
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=cut
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