zend-framework1 /Auth/Adapter/Digest.php

Language PHP Lines 253
MD5 Hash ed24998a8768f9730711f94a62737b2e Estimated Cost $2,484 (why?)
Repository https://bitbucket.org/goldie/zend-framework1.git View Raw File View Project SPDX
  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
<?php
/**
 * Zend Framework
 *
 * LICENSE
 *
 * This source file is subject to the new BSD license that is bundled
 * with this package in the file LICENSE.txt.
 * It is also available through the world-wide-web at this URL:
 * http://framework.zend.com/license/new-bsd
 * If you did not receive a copy of the license and are unable to
 * obtain it through the world-wide-web, please send an email
 * to license@zend.com so we can send you a copy immediately.
 *
 * @category   Zend
 * @package    Zend_Auth
 * @subpackage Adapter
 * @copyright  Copyright (c) 2005-2011 Zend Technologies USA Inc. (http://www.zend.com)
 * @license    http://framework.zend.com/license/new-bsd     New BSD License
 * @version    $Id: Digest.php 23775 2011-03-01 17:25:24Z ralph $
 */


/**
 * @see Zend_Auth_Adapter_Interface
 */
require_once 'Zend/Auth/Adapter/Interface.php';


/**
 * @category   Zend
 * @package    Zend_Auth
 * @subpackage Adapter
 * @copyright  Copyright (c) 2005-2011 Zend Technologies USA Inc. (http://www.zend.com)
 * @license    http://framework.zend.com/license/new-bsd     New BSD License
 */
class Zend_Auth_Adapter_Digest implements Zend_Auth_Adapter_Interface
{
    /**
     * Filename against which authentication queries are performed
     *
     * @var string
     */
    protected $_filename;

    /**
     * Digest authentication realm
     *
     * @var string
     */
    protected $_realm;

    /**
     * Digest authentication user
     *
     * @var string
     */
    protected $_username;

    /**
     * Password for the user of the realm
     *
     * @var string
     */
    protected $_password;

    /**
     * Sets adapter options
     *
     * @param  mixed $filename
     * @param  mixed $realm
     * @param  mixed $username
     * @param  mixed $password
     * @return void
     */
    public function __construct($filename = null, $realm = null, $username = null, $password = null)
    {
        $options = array('filename', 'realm', 'username', 'password');
        foreach ($options as $option) {
            if (null !== $$option) {
                $methodName = 'set' . ucfirst($option);
                $this->$methodName($$option);
            }
        }
    }

    /**
     * Returns the filename option value or null if it has not yet been set
     *
     * @return string|null
     */
    public function getFilename()
    {
        return $this->_filename;
    }

    /**
     * Sets the filename option value
     *
     * @param  mixed $filename
     * @return Zend_Auth_Adapter_Digest Provides a fluent interface
     */
    public function setFilename($filename)
    {
        $this->_filename = (string) $filename;
        return $this;
    }

    /**
     * Returns the realm option value or null if it has not yet been set
     *
     * @return string|null
     */
    public function getRealm()
    {
        return $this->_realm;
    }

    /**
     * Sets the realm option value
     *
     * @param  mixed $realm
     * @return Zend_Auth_Adapter_Digest Provides a fluent interface
     */
    public function setRealm($realm)
    {
        $this->_realm = (string) $realm;
        return $this;
    }

    /**
     * Returns the username option value or null if it has not yet been set
     *
     * @return string|null
     */
    public function getUsername()
    {
        return $this->_username;
    }

    /**
     * Sets the username option value
     *
     * @param  mixed $username
     * @return Zend_Auth_Adapter_Digest Provides a fluent interface
     */
    public function setUsername($username)
    {
        $this->_username = (string) $username;
        return $this;
    }

    /**
     * Returns the password option value or null if it has not yet been set
     *
     * @return string|null
     */
    public function getPassword()
    {
        return $this->_password;
    }

    /**
     * Sets the password option value
     *
     * @param  mixed $password
     * @return Zend_Auth_Adapter_Digest Provides a fluent interface
     */
    public function setPassword($password)
    {
        $this->_password = (string) $password;
        return $this;
    }

    /**
     * Defined by Zend_Auth_Adapter_Interface
     *
     * @throws Zend_Auth_Adapter_Exception
     * @return Zend_Auth_Result
     */
    public function authenticate()
    {
        $optionsRequired = array('filename', 'realm', 'username', 'password');
        foreach ($optionsRequired as $optionRequired) {
            if (null === $this->{"_$optionRequired"}) {
                /**
                 * @see Zend_Auth_Adapter_Exception
                 */
                require_once 'Zend/Auth/Adapter/Exception.php';
                throw new Zend_Auth_Adapter_Exception("Option '$optionRequired' must be set before authentication");
            }
        }

        if (false === ($fileHandle = @fopen($this->_filename, 'r'))) {
            /**
             * @see Zend_Auth_Adapter_Exception
             */
            require_once 'Zend/Auth/Adapter/Exception.php';
            throw new Zend_Auth_Adapter_Exception("Cannot open '$this->_filename' for reading");
        }

        $id       = "$this->_username:$this->_realm";
        $idLength = strlen($id);

        $result = array(
            'code'  => Zend_Auth_Result::FAILURE,
            'identity' => array(
                'realm'    => $this->_realm,
                'username' => $this->_username,
                ),
            'messages' => array()
            );

        while ($line = trim(fgets($fileHandle))) {
            if (substr($line, 0, $idLength) === $id) {
                if ($this->_secureStringCompare(substr($line, -32), md5("$this->_username:$this->_realm:$this->_password"))) {
                    $result['code'] = Zend_Auth_Result::SUCCESS;
                } else {
                    $result['code'] = Zend_Auth_Result::FAILURE_CREDENTIAL_INVALID;
                    $result['messages'][] = 'Password incorrect';
                }
                return new Zend_Auth_Result($result['code'], $result['identity'], $result['messages']);
            }
        }

        $result['code'] = Zend_Auth_Result::FAILURE_IDENTITY_NOT_FOUND;
        $result['messages'][] = "Username '$this->_username' and realm '$this->_realm' combination not found";
        return new Zend_Auth_Result($result['code'], $result['identity'], $result['messages']);
    }

    /**
     * Securely compare two strings for equality while avoided C level memcmp()
     * optimisations capable of leaking timing information useful to an attacker
     * attempting to iteratively guess the unknown string (e.g. password) being
     * compared against.
     *
     * @param string $a
     * @param string $b
     * @return bool
     */
    protected function _secureStringCompare($a, $b)
    {
        if (strlen($a) !== strlen($b)) {
            return false;
        }
        $result = 0;
        for ($i = 0; $i < strlen($a); $i++) {
            $result |= ord($a[$i]) ^ ord($b[$i]);
        }
        return $result == 0;
    }
}
Back to Top