xref: /dokuwiki/lib/plugins/authplain/auth.php (revision 5312cb0b4d32952be3e1f5acf82422c2d01f26fe) 
1<?php
2
3/**
4 * Plaintext authentication backend
5 *
6 * @license    GPL 2 (http://www.gnu.org/licenses/gpl.html)
7 * @author     Andreas Gohr <andi@splitbrain.org>
8 * @author     Chris Smith <chris@jalakai.co.uk>
9 * @author     Jan Schumann <js@schumann-it.com>
10 */
11class auth_plugin_authplain extends DokuWiki_Auth_Plugin
12{
13    /** @var array user cache */
14    protected $users = null;
15
16    /** @var array filter pattern */
17    protected $pattern = array();
18
19    /** @var bool safe version of preg_split */
20    protected $pregsplit_safe = false;
21
22    /**
23     * Constructor
24     *
25     * Carry out sanity checks to ensure the object is
26     * able to operate. Set capabilities.
27     *
28     * @author  Christopher Smith <chris@jalakai.co.uk>
29     */
30    public function __construct()
31    {
32        parent::__construct();
33        global $config_cascade;
34
35        if (!@is_readable($config_cascade['plainauth.users']['default'])) {
36            $this->success = false;
37        } else {
38            if (@is_writable($config_cascade['plainauth.users']['default'])) {
39                $this->cando['addUser']   = true;
40                $this->cando['delUser']   = true;
41                $this->cando['modLogin']  = true;
42                $this->cando['modPass']   = true;
43                $this->cando['modName']   = true;
44                $this->cando['modMail']   = true;
45                $this->cando['modGroups'] = true;
46            }
47            $this->cando['getUsers']     = true;
48            $this->cando['getUserCount'] = true;
49            $this->cando['getGroups']    = true;
50        }
51
52        $this->pregsplit_safe = version_compare(PCRE_VERSION, '6.7', '>=');
53    }
54
55    /**
56     * Check user+password
57     *
58     * Checks if the given user exists and the given
59     * plaintext password is correct
60     *
61     * @author  Andreas Gohr <andi@splitbrain.org>
62     * @param string $user
63     * @param string $pass
64     * @return  bool
65     */
66    public function checkPass($user, $pass)
67    {
68        $userinfo = $this->getUserData($user);
69        if ($userinfo === false) return false;
70
71        return auth_verifyPassword($pass, $this->users[$user]['pass']);
72    }
73
74    /**
75     * Return user info
76     *
77     * Returns info about the given user needs to contain
78     * at least these fields:
79     *
80     * name string  full name of the user
81     * mail string  email addres of the user
82     * grps array   list of groups the user is in
83     *
84     * @author  Andreas Gohr <andi@splitbrain.org>
85     * @param string $user
86     * @param bool $requireGroups  (optional) ignored by this plugin, grps info always supplied
87     * @return array|false
88     */
89    public function getUserData($user, $requireGroups = true)
90    {
91        if ($this->users === null) $this->loadUserData();
92        return isset($this->users[$user]) ? $this->users[$user] : false;
93    }
94
95    /**
96     * Creates a string suitable for saving as a line
97     * in the file database
98     * (delimiters escaped, etc.)
99     *
100     * @param string $user
101     * @param string $pass
102     * @param string $name
103     * @param string $mail
104     * @param array  $grps list of groups the user is in
105     * @return string
106     */
107    protected function createUserLine($user, $pass, $name, $mail, $grps)
108    {
109        $groups   = join(',', $grps);
110        $userline = array($user, $pass, $name, $mail, $groups);
111        $userline = str_replace('\\', '\\\\', $userline); // escape \ as \\
112        $userline = str_replace(':', '\\:', $userline); // escape : as \:
113        $userline = join(':', $userline)."\n";
114        return $userline;
115    }
116
117    /**
118     * Create a new User
119     *
120     * Returns false if the user already exists, null when an error
121     * occurred and true if everything went well.
122     *
123     * The new user will be added to the default group by this
124     * function if grps are not specified (default behaviour).
125     *
126     * @author  Andreas Gohr <andi@splitbrain.org>
127     * @author  Chris Smith <chris@jalakai.co.uk>
128     *
129     * @param string $user
130     * @param string $pwd
131     * @param string $name
132     * @param string $mail
133     * @param array  $grps
134     * @return bool|null|string
135     */
136    public function createUser($user, $pwd, $name, $mail, $grps = null)
137    {
138        global $conf;
139        global $config_cascade;
140
141        // user mustn't already exist
142        if ($this->getUserData($user) !== false) {
143            msg($this->getLang('userexists'), -1);
144            return false;
145        }
146
147        $pass = auth_cryptPassword($pwd);
148
149        // set default group if no groups specified
150        if (!is_array($grps)) $grps = array($conf['defaultgroup']);
151
152        // prepare user line
153        $userline = $this->createUserLine($user, $pass, $name, $mail, $grps);
154
155        if (!io_saveFile($config_cascade['plainauth.users']['default'], $userline, true)) {
156            msg($this->getLang('writefail'), -1);
157            return null;
158        }
159
160        $this->users[$user] = compact('pass', 'name', 'mail', 'grps');
161        return $pwd;
162    }
163
164    /**
165     * Modify user data
166     *
167     * @author  Chris Smith <chris@jalakai.co.uk>
168     * @param   string $user      nick of the user to be changed
169     * @param   array  $changes   array of field/value pairs to be changed (password will be clear text)
170     * @return  bool
171     */
172    public function modifyUser($user, $changes)
173    {
174        global $ACT;
175        global $config_cascade;
176
177        // sanity checks, user must already exist and there must be something to change
178        if (($userinfo = $this->getUserData($user)) === false) {
179            msg($this->getLang('usernotexists'), -1);
180            return false;
181        }
182
183        // don't modify protected users
184        if (!empty($userinfo['protected'])) {
185            msg(sprintf($this->getLang('protected'), hsc($user)), -1);
186            return false;
187        }
188
189        if (!is_array($changes) || !count($changes)) return true;
190
191        // update userinfo with new data, remembering to encrypt any password
192        $newuser = $user;
193        foreach ($changes as $field => $value) {
194            if ($field == 'user') {
195                $newuser = $value;
196                continue;
197            }
198            if ($field == 'pass') $value = auth_cryptPassword($value);
199            $userinfo[$field] = $value;
200        }
201
202        $userline = $this->createUserLine(
203            $newuser,
204            $userinfo['pass'],
205            $userinfo['name'],
206            $userinfo['mail'],
207            $userinfo['grps']
208        );
209
210        if (!io_replaceInFile($config_cascade['plainauth.users']['default'], '/^'.$user.':/', $userline, true)) {
211            msg('There was an error modifying your user data. You may need to register again.', -1);
212            // FIXME, io functions should be fail-safe so existing data isn't lost
213            $ACT = 'register';
214            return false;
215        }
216
217        $this->users[$newuser] = $userinfo;
218        return true;
219    }
220
221    /**
222     * Remove one or more users from the list of registered users
223     *
224     * @author  Christopher Smith <chris@jalakai.co.uk>
225     * @param   array  $users   array of users to be deleted
226     * @return  int             the number of users deleted
227     */
228    public function deleteUsers($users)
229    {
230        global $config_cascade;
231
232        if (!is_array($users) || empty($users)) return 0;
233
234        if ($this->users === null) $this->loadUserData();
235
236        $deleted = array();
237        foreach ($users as $user) {
238            // don't delete protected users
239            if (!empty($this->users[$user]['protected'])) {
240                msg(sprintf($this->getLang('protected'), hsc($user)), -1);
241                continue;
242            }
243            if (isset($this->users[$user])) $deleted[] = preg_quote($user, '/');
244        }
245
246        if (empty($deleted)) return 0;
247
248        $pattern = '/^('.join('|', $deleted).'):/';
249        if (!io_deleteFromFile($config_cascade['plainauth.users']['default'], $pattern, true)) {
250            msg($this->getLang('writefail'), -1);
251            return 0;
252        }
253
254        // reload the user list and count the difference
255        $count = count($this->users);
256        $this->loadUserData();
257        $count -= count($this->users);
258        return $count;
259    }
260
261    /**
262     * Return a count of the number of user which meet $filter criteria
263     *
264     * @author  Chris Smith <chris@jalakai.co.uk>
265     *
266     * @param array $filter
267     * @return int
268     */
269    public function getUserCount($filter = array())
270    {
271
272        if ($this->users === null) $this->loadUserData();
273
274        if (!count($filter)) return count($this->users);
275
276        $count = 0;
277        $this->constructPattern($filter);
278
279        foreach ($this->users as $user => $info) {
280            $count += $this->filter($user, $info);
281        }
282
283        return $count;
284    }
285
286    /**
287     * Bulk retrieval of user data
288     *
289     * @author  Chris Smith <chris@jalakai.co.uk>
290     *
291     * @param   int   $start index of first user to be returned
292     * @param   int   $limit max number of users to be returned
293     * @param   array $filter array of field/pattern pairs
294     * @return  array userinfo (refer getUserData for internal userinfo details)
295     */
296    public function retrieveUsers($start = 0, $limit = 0, $filter = array())
297    {
298
299        if ($this->users === null) $this->loadUserData();
300
301        ksort($this->users);
302
303        $i     = 0;
304        $count = 0;
305        $out   = array();
306        $this->constructPattern($filter);
307
308        foreach ($this->users as $user => $info) {
309            if ($this->filter($user, $info)) {
310                if ($i >= $start) {
311                    $out[$user] = $info;
312                    $count++;
313                    if (($limit > 0) && ($count >= $limit)) break;
314                }
315                $i++;
316            }
317        }
318
319        return $out;
320    }
321
322    /**
323     * Retrieves groups.
324     * Loads complete user data into memory before searching for groups.
325     *
326     * @param   int   $start index of first group to be returned
327     * @param   int   $limit max number of groups to be returned
328     * @return  array
329     */
330    public function retrieveGroups($start = 0, $limit = 0)
331    {
332        $groups = [];
333
334        if ($this->users === null) $this->loadUserData();
335        foreach($this->users as $user => $info) {
336            $groups = array_merge($groups, array_diff($info['grps'], $groups));
337        }
338
339        if($limit > 0) {
340            return array_splice($groups, $start, $limit);
341        }
342        return array_splice($groups, $start);
343    }
344
345    /**
346     * Only valid pageid's (no namespaces) for usernames
347     *
348     * @param string $user
349     * @return string
350     */
351    public function cleanUser($user)
352    {
353        global $conf;
354        return cleanID(str_replace(':', $conf['sepchar'], $user));
355    }
356
357    /**
358     * Only valid pageid's (no namespaces) for groupnames
359     *
360     * @param string $group
361     * @return string
362     */
363    public function cleanGroup($group)
364    {
365        global $conf;
366        return cleanID(str_replace(':', $conf['sepchar'], $group));
367    }
368
369    /**
370     * Load all user data
371     *
372     * loads the user file into a datastructure
373     *
374     * @author  Andreas Gohr <andi@splitbrain.org>
375     */
376    protected function loadUserData()
377    {
378        global $config_cascade;
379
380        $this->users = $this->readUserFile($config_cascade['plainauth.users']['default']);
381
382        // support protected users
383        if (!empty($config_cascade['plainauth.users']['protected'])) {
384            $protected = $this->readUserFile($config_cascade['plainauth.users']['protected']);
385            foreach (array_keys($protected) as $key) {
386                $protected[$key]['protected'] = true;
387            }
388            $this->users = array_merge($this->users, $protected);
389        }
390    }
391
392    /**
393     * Read user data from given file
394     *
395     * ignores non existing files
396     *
397     * @param string $file the file to load data from
398     * @return array
399     */
400    protected function readUserFile($file)
401    {
402        $users = array();
403        if (!file_exists($file)) return $users;
404
405        $lines = file($file);
406        foreach ($lines as $line) {
407            $line = preg_replace('/#.*$/', '', $line); //ignore comments
408            $line = trim($line);
409            if (empty($line)) continue;
410
411            $row = $this->splitUserData($line);
412            $row = str_replace('\\:', ':', $row);
413            $row = str_replace('\\\\', '\\', $row);
414
415            $groups = array_values(array_filter(explode(",", $row[4])));
416
417            $users[$row[0]]['pass'] = $row[1];
418            $users[$row[0]]['name'] = urldecode($row[2]);
419            $users[$row[0]]['mail'] = $row[3];
420            $users[$row[0]]['grps'] = $groups;
421        }
422        return $users;
423    }
424
425    /**
426     * Get the user line split into it's parts
427     *
428     * @param string $line
429     * @return string[]
430     */
431    protected function splitUserData($line)
432    {
433        // due to a bug in PCRE 6.6, preg_split will fail with the regex we use here
434        // refer github issues 877 & 885
435        if ($this->pregsplit_safe) {
436            return preg_split('/(?<![^\\\\]\\\\)\:/', $line, 5);       // allow for : escaped as \:
437        }
438
439        $row = array();
440        $piece = '';
441        $len = strlen($line);
442        for ($i=0; $i<$len; $i++) {
443            if ($line[$i]=='\\') {
444                $piece .= $line[$i];
445                $i++;
446                if ($i>=$len) break;
447            } elseif ($line[$i]==':') {
448                $row[] = $piece;
449                $piece = '';
450                continue;
451            }
452            $piece .= $line[$i];
453        }
454        $row[] = $piece;
455
456        return $row;
457    }
458
459    /**
460     * return true if $user + $info match $filter criteria, false otherwise
461     *
462     * @author   Chris Smith <chris@jalakai.co.uk>
463     *
464     * @param string $user User login
465     * @param array  $info User's userinfo array
466     * @return bool
467     */
468    protected function filter($user, $info)
469    {
470        foreach ($this->pattern as $item => $pattern) {
471            if ($item == 'user') {
472                if (!preg_match($pattern, $user)) return false;
473            } elseif ($item == 'grps') {
474                if (!count(preg_grep($pattern, $info['grps']))) return false;
475            } else {
476                if (!preg_match($pattern, $info[$item])) return false;
477            }
478        }
479        return true;
480    }
481
482    /**
483     * construct a filter pattern
484     *
485     * @param array $filter
486     */
487    protected function constructPattern($filter)
488    {
489        $this->pattern = array();
490        foreach ($filter as $item => $pattern) {
491            $this->pattern[$item] = '/'.str_replace('/', '\/', $pattern).'/i'; // allow regex characters
492        }
493    }
494}
495