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Merge pull request #10440 from tom--/10435-file_get_contents(/dev/urandom)

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fix #10435 with file get contents(/dev/urandom)
This commit is contained in:
Alexander Makarov
2015-12-21 11:27:06 +03:00
parent 67cc16a07d ba19858e58
commit cb908451d5
2 changed files with 53 additions and 52 deletions
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83
framework/base/Security.php
View File

@ -89,12 +89,6 @@ class Security extends Component
*/
public $passwordHashCost = 13;
/**
* @var resource|string|null Identifies the random source of the last successful call of [[generateRandomKey]].
* Caches the file pointer to /dev/urandom if it was fopened.
*/
private $_randomSource;
/**
* Encrypts data using a password.
* Derives keys for encryption and authentication from the password using PBKDF2 and a random salt,
@ -428,6 +422,16 @@ class Security extends Component
return false;
}
const DEV_URANDOM = '/dev/urandom';
const SOURCE_LIBRE_SSL = 'LibreSSL';
const SOURCE_MCRYPT = 'mcrypt';
const SOURCE_OPEN_SSL = 'OpenSSL';
const SOURCE_URANDOM = 'urandom';
/**
* @var string|null Identifies the random source of the last successful call of [[generateRandomKey]].
*/
private $_randomSource;
/**
* Generates specified number of random bytes.
* Note that output may not be ASCII.
@ -455,7 +459,7 @@ class Security extends Component
// The recent LibreSSL RNGs are faster and better than /dev/urandom.
// Parse OPENSSL_VERSION_TEXT because OPENSSL_VERSION_NUMBER is no use for LibreSSL.
// https://bugs.php.net/bug.php?id=71143
if ($this->_randomSource === 'LibreSSL'
if ($this->_randomSource === self::SOURCE_LIBRE_SSL
|| ($this->_randomSource === null
&& defined('OPENSSL_VERSION_TEXT')
&& preg_match('{^LibreSSL (\d\d?)\.(\d\d?)\.(\d\d?)$}', OPENSSL_VERSION_TEXT, $matches)
@ -468,7 +472,7 @@ class Security extends Component
);
}
if ($key !== false && StringHelper::byteLength($key) === $length) {
$this->_randomSource = 'LibreSSL';
$this->_randomSource = self::SOURCE_LIBRE_SSL;
return $key;
}
@ -478,14 +482,14 @@ class Security extends Component
// mcrypt_create_iv() does not use libmcrypt. Since PHP 5.3.7 it directly reads
// CrypGenRandom on Windows. Elsewhere it directly reads /dev/urandom.
if ($this->_randomSource === 'mcrypt'
if ($this->_randomSource === self::SOURCE_MCRYPT
|| ($this->_randomSource === null
&& PHP_VERSION_ID >= 50307
&& function_exists('mcrypt_create_iv'))
) {
$key = mcrypt_create_iv($length, MCRYPT_DEV_URANDOM);
if (StringHelper::byteLength($key) === $length) {
$this->_randomSource = 'mcrypt';
$this->_randomSource = self::SOURCE_MCRYPT;
return $key;
}
@ -493,48 +497,23 @@ class Security extends Component
$this->_randomSource = null;
}
// If not on Windows, try reading from /dev/urandom device. If successful, cache
// the file pointer in $this->_randomSource.
if (is_resource($this->_randomSource)
|| ($this->_randomSource === null
&& DIRECTORY_SEPARATOR === '/'
&& @is_readable('/dev/urandom'))
) {
// Either open /dev/urandom or get the cached file pointer.
if (is_resource($this->_randomSource)) {
$urandomFile = $this->_randomSource;
} else {
$urandomFile = fopen('/dev/urandom', 'rb');
if ($urandomFile) {
// Check the file's inode protection mode is 'character special'.
// NOTE: octal integer literals!
$fstat = fstat($urandomFile);
if (($fstat['mode'] & 0170000) !== 020000) {
fclose($urandomFile);
$urandomFile = null;
}
} else {
$urandomFile = null;
}
}
// If not on Windows, test for a /dev/urandom device.
if ($this->_randomSource === null && DIRECTORY_SEPARATOR === '/') {
// Check it for speacial character device protection mode. Do not follow
// symbolic link at '/dev/urandom', as such would be suspicious. With lstat()
// (as opposed to stat()) the test fails if it is.
$lstat = @lstat(self::DEV_URANDOM);
$urandomDevice = $lstat !== false && ($lstat['mode'] & 0170000) === 020000;
} else {
$urandomDevice = false;
}
if ($this->_randomSource === self::SOURCE_URANDOM || $urandomDevice) {
$key = @file_get_contents(self::DEV_URANDOM, false, null, 0, $length);
if ($urandomFile !== null) {
// $length could be large so read using a loop.
$key = '';
do {
$buffer = fread($urandomFile, $length);
if (!$buffer) {
$key = null;
break;
}
$key .= $buffer;
} while (StringHelper::byteLength($key) < $length);
if ($key !== false && StringHelper::byteLength($key) === $length) {
$this->_randomSource = self::SOURCE_URANDOM;
if ($key !== null && StringHelper::byteLength($key) === $length) {
$this->_randomSource = $urandomFile;
return $key;
}
return $key;
}
$this->_randomSource = null;
@ -542,7 +521,7 @@ class Security extends Component
// Since 5.4.0, openssl_random_pseudo_bytes() reads from CryptGenRandom on Windows instead
// of using OpenSSL library. Don't use OpenSSL on other platforms.
if ($this->_randomSource === 'OpenSSL'
if ($this->_randomSource === self::SOURCE_OPEN_SSL
|| (DIRECTORY_SEPARATOR !== '/' && PHP_VERSION_ID >= 50400)
) {
$key = openssl_random_pseudo_bytes($length, $cryptoStrong);
@ -552,7 +531,7 @@ class Security extends Component
);
}
if ($key !== false && StringHelper::byteLength($key) === $length) {
$this->_randomSource = 'OpenSSL';
$this->_randomSource = self::SOURCE_OPEN_SSL;
return $key;
}

22
tests/framework/base/SecurityTest.php
View File

@ -810,6 +810,28 @@ TEXT;
$this->assertTrue($key1 != $key2);
}
public function testGenerateRandomKeyURandom()
{
if (function_exists('random_bytes')) {
$this->markTestSkipped('This test can only work on platforms where random_bytes() function does not exist. You may disable it in php.ini for testing. http://php.net/manual/en/ini.core.php#ini.disable-functions');
}
if (PHP_VERSION_ID >= 50307 && function_exists('mcrypt_create_iv')) {
$this->markTestSkipped('This test can only work on platforms where mcrypt_create_iv() function does not exist. You may disable it in php.ini for testing. http://php.net/manual/en/ini.core.php#ini.disable-functions');
}
if (!@is_readable('/dev/urandom')) {
$this->markTestSkipped('/dev/urandom does not seem to exist on your system.');
}
$length = 1024 * 1024;
$key1 = $this->security->generateRandomKey($length);
$this->assertInternalType('string', $key1);
$this->assertEquals($length, strlen($key1));
$key2 = $this->security->generateRandomKey($length);
$this->assertInternalType('string', $key2);
$this->assertEquals($length, strlen($key2));
$this->assertTrue($key1 != $key2);
}
public function testGenerateRandomString()
{
$length = 21;