1<?php
2/**
3 * django auth backend
4 *
5 * @author    Andreas Gohr <andi@splitbrain.org>
6 * @author    Michael Luggen <michael.luggen at unifr.ch>
7 * @author    Robert Czechowski <zgtm at zgtm.de>
8 */
9
10define('DOKU_AUTH', dirname(__FILE__));
11define('AUTH_USERFILE',DOKU_CONF.'users.auth.php');
12
13class auth_plugin_authdjango extends DokuWiki_Auth_Plugin  {
14
15    var $dbh = null; // db handle
16
17    /**
18     * Constructor.
19     *
20     * Sets additional capabilities and config strings
21     * @author    Michael Luggen <michael.luggen at rhone.ch>
22     * @author    Robert Czechowski <zgtm at zgtm.de>
23     */
24    public function __construct()
25    {
26        parent::__construct();
27
28        global $config_cascade;
29        global $dbh;
30
31        $this->cando['external'] = true;
32        $this->cando['getGroups'] = true;
33
34        $this->cando['logout'] = !empty($this->getConf('logoff_uri'));
35
36        try {
37            // Connecting, selecting database
38            if ($this->getConf('protocol') == 'sqlite') {
39                $this->dbh = new PDO('sqlite:' . $this->getConf('server'));
40            }
41            else {
42                $this->dbh = new PDO($this->getConf('protocol') . ':host=' . $this->getConf('server') . ';dbname=' . $this->getConf('db'), $this->getConf('user'), $this->getConf('password'));
43            }
44        } catch (PDOException $e) {
45            msg("Can not connect to database!", -1);
46            dbg($e);
47            $this->success = false;
48        }
49        $this->success = true;
50    }
51
52    function trustExternal($user,$pass,$sticky=false){
53        global $USERINFO;
54        global $conf;
55        global $dbh;
56
57        $sticky ? $sticky = true : $sticky = false; //sanity check
58
59        /**
60         * Just checks against the django sessionid variable,
61         * gets user info from django-database
62         */
63
64        if (isset($_COOKIE['sessionid']) && $this->dbh) {
65
66            $s_id =  $_COOKIE['sessionid'];
67
68            // Look the cookie up in the db
69            $query = 'SELECT session_data FROM django_session WHERE session_key=' . $this->dbh->quote($s_id) . ' LIMIT 1;';
70            $result = $this->dbh->query($query) or die('Query failed1: ' . $this->dbh->errorInfo());
71            $ar = $result->fetch(PDO::FETCH_ASSOC);
72            $session_data = $ar['session_data'];
73
74            // TODO: $session_data can now be empty if the session does not exist in database, handle correctly instead of just dying
75            if (strlen($session_data) == 0) {
76                return false;
77            }
78
79            $compressed = false;
80
81            if (str_contains($session_data, ":")) {
82                // New django session encoding since django 4
83                if ($session_data[0] == '.') {
84                    $compressed = true;
85                    $session_data = substr($session_data, 1);
86                }
87
88                $session_json = base64_decode(strtr(preg_split('/:/', $session_data, 2)[0], "-_", "+/"), true);
89
90                if ($compressed) {
91                       $session_json = zlib_decode($session_json);
92                }
93
94            } else {
95                // Old django session enconding until django 3
96                // Decoding the session data:
97
98                $session_json = preg_split('/:/', base64_decode($session_data), 2)[1];
99            }
100            $userid = json_decode($session_json, true)['_auth_user_id'];
101            $query2 = 'SELECT username, first_name, last_name, email, is_superuser, is_staff FROM auth_user WHERE id=' . $this->dbh->quote($userid) . ' LIMIT 1;';
102
103            $result2 = $this->dbh->query($query2) or die('Query failed2: ' . print_r($this->dbh->errorInfo()));
104            $user = $result2->fetch(PDO::FETCH_ASSOC);
105
106            $username =  $user['username'];
107            $userfullname = $user['first_name'] . " " . $user['last_name'];
108            $useremail = $user['email'];
109
110            // okay we're logged in - set the globals
111            $groups = $this->_getUserGroups($username);
112
113            $USERINFO['name'] = $username;
114            $USERINFO['pass'] = '';
115            $USERINFO['mail'] = $useremail;
116
117            if (($user['is_superuser'] && $this->getConf('admin_admin') == 1)
118                || ($user['is_staff'] && $this->getConf('staff_admin') == 1))
119            {
120                $groups[] = 'admin';
121            }
122            $USERINFO['grps'] = $groups;
123
124            $_SERVER['REMOTE_USER'] = $username;
125
126            $_SESSION[DOKU_COOKIE]['auth']['user'] = $username;
127            $_SESSION[DOKU_COOKIE]['auth']['info'] = $USERINFO;
128
129            return true;
130        }
131        return false;
132    }
133
134    function _getUserGroups($user){
135        $query = 'SELECT auth_group.name FROM auth_user, auth_user_groups, auth_group where auth_user.username = ' . $this->dbh->quote($user) . ' AND auth_user.id = auth_user_groups.user_id AND auth_user_groups.group_id = auth_group.id;';
136
137        $result = $this->dbh->query($query) or die('Query failed3: ' . $this->dbh->errorInfo());
138
139        $groups = [];
140        foreach ($result as $row) {
141            $groups[] = $row[0];
142        };
143
144        if (!in_array("user", $groups)) {
145            $groups[] = "user";
146        }
147
148        return $groups;
149    }
150
151    function retrieveGroups($start=0,$limit=0){
152        $query = 'SELECT auth_group.name FROM auth_group';
153
154        $result = $this->dbh->query($query) or die('Query failed4: ' . $this->dbh->errorInfo());
155
156        $groups = [];
157        foreach ($result as $row) {
158            $groups[] = $row[0];
159        };
160
161        if (!in_array("user", $groups)) {
162            $groups[] = "user";
163        }
164
165        if (!in_array("admin", $groups)) {
166            $groups[] = "admin";
167        }
168
169        return $groups;
170    }
171
172    function logOff() {
173        header("Location: " . $this->getConf('logoff_uri'));
174        die();
175    }
176
177
178    function __destruct() {
179        $this->dbh = null;
180    }
181}
182