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<?php |
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declare(strict_types=1); |
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namespace SimpleSAML\Module\ldap\Connector; |
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use SimpleSAML\Utils; |
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use function asc2hex32; |
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use function dec2hex; |
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use function ord; |
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use function str_pad; |
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use function str_replace; |
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use function strlen; |
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use function substr; |
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trait LdapHelpers |
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{ |
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/** |
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* Escapes the given VALUES according to RFC 2254 so that they can be safely used in LDAP filters. |
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* |
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* Any control characters with an ASCII code < 32 as well as the characters with special meaning in |
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* LDAP filters "*", "(", ")", and "\" (the backslash) are converted into the representation of a |
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* backslash followed by two hex digits representing the hexadecimal value of the character. |
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* |
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* @param string|string[] $values Array of values to escape |
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* @param bool $singleValue |
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* @return string|string[] Array $values, but escaped |
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*/ |
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public function escapeFilterValue($values = [], bool $singleValue = true) |
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{ |
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// Parameter validation |
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$arrayUtils = new Utils\Arrays(); |
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$values = $arrayUtils->arrayize($values); |
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foreach ($values as $key => $val) { |
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if ($val === null) { |
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$val = '\0'; // apply escaped "null" if string is empty |
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} else { |
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// Escaping of filter meta characters |
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$val = str_replace('\\', '\5c', $val); |
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$val = str_replace('*', '\2a', $val); |
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$val = str_replace('(', '\28', $val); |
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$val = str_replace(')', '\29', $val); |
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// ASCII < 32 escaping |
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$val = $this->asc2hex32($val); |
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} |
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$values[$key] = $val; |
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} |
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if ($singleValue) { |
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return $values[0]; |
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} |
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return $values; |
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} |
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/** |
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* Converts all ASCII chars < 32 to "\HEX" |
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* |
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* @param string $string String to convert |
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* @return string |
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*/ |
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public function asc2hex32(string $string): string |
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{ |
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for ($i = 0; $i < strlen($string); $i++) { |
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$char = substr($string, $i, 1); |
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if (ord($char) < 32) { |
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$hex = str_pad(dechex(ord($char)), 2, '0', STR_PAD_LEFT); |
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$string = str_replace($char, '\\' . $hex, $string); |
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} |
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} |
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return $string; |
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} |
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} |
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simplesamlphp /
simplesamlphp-module-ldap
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