Include composer dependencies in repo

1 files changed, 374 insertions, 0 deletions

diff --git a/vendor/zendframework/zendxml/library/ZendXml/Security.php b/vendor/zendframework/zendxml/library/ZendXml/Security.php
new file mode 100644
index 00000000..892e2ab1
--- /dev/null
+++ b/vendor/zendframework/zendxml/library/ZendXml/Security.php
@@ -0,0 +1,374 @@
+<?php
+/**
+ * Zend Framework (http://framework.zend.com/)
+ *
+ * @link      http://github.com/zendframework/zf2 for the canonical source repository
+ * @copyright Copyright (c) 2005-2015 Zend Technologies USA Inc. (http://www.zend.com)
+ * @license   http://framework.zend.com/license/new-bsd New BSD License
+ */
+namespace ZendXml;
+
+use DOMDocument;
+use SimpleXMLElement;
+
+class Security
+{
+    const ENTITY_DETECT = 'Detected use of ENTITY in XML, disabled to prevent XXE/XEE attacks';
+
+    /**
+     * Heuristic scan to detect entity in XML
+     *
+     * @param  string $xml
+     * @throws Exception\RuntimeException If entity expansion or external entity declaration was discovered.
+     */
+    protected static function heuristicScan($xml)
+    {
+        foreach (self::getEntityComparison($xml) as $compare) {
+            if (strpos($xml, $compare) !== false) {
+                throw new Exception\RuntimeException(self::ENTITY_DETECT);
+            }
+        }
+    }
+
+    /**
+     * Scan XML string for potential XXE and XEE attacks
+     *
+     * @param   string $xml
+     * @param   DomDocument $dom
+     * @throws  Exception\RuntimeException
+     * @return  SimpleXMLElement|DomDocument|boolean
+     */
+    public static function scan($xml, DOMDocument $dom = null)
+    {
+        // If running with PHP-FPM we perform an heuristic scan
+        // We cannot use libxml_disable_entity_loader because of this bug
+        // @see https://bugs.php.net/bug.php?id=64938
+        if (self::isPhpFpm()) {
+            self::heuristicScan($xml);
+        }
+
+        if (null === $dom) {
+            $simpleXml = true;
+            $dom = new DOMDocument();
+        }
+
+        if (!self::isPhpFpm()) {
+            $loadEntities = libxml_disable_entity_loader(true);
+            $useInternalXmlErrors = libxml_use_internal_errors(true);
+        }
+
+        // Load XML with network access disabled (LIBXML_NONET)
+        // error disabled with @ for PHP-FPM scenario
+        set_error_handler(function ($errno, $errstr) {
+            if (substr_count($errstr, 'DOMDocument::loadXML()') > 0) {
+                return true;
+            }
+            return false;
+        }, E_WARNING);
+        $result = $dom->loadXml($xml, LIBXML_NONET);
+        restore_error_handler();
+
+        if (!$result) {
+            // Entity load to previous setting
+            if (!self::isPhpFpm()) {
+                libxml_disable_entity_loader($loadEntities);
+                libxml_use_internal_errors($useInternalXmlErrors);
+            }
+            return false;
+        }
+
+        // Scan for potential XEE attacks using ENTITY, if not PHP-FPM
+        if (!self::isPhpFpm()) {
+            foreach ($dom->childNodes as $child) {
+                if ($child->nodeType === XML_DOCUMENT_TYPE_NODE) {
+                    if ($child->entities->length > 0) {
+                        throw new Exception\RuntimeException(self::ENTITY_DETECT);
+                    }
+                }
+            }
+        }
+
+        // Entity load to previous setting
+        if (!self::isPhpFpm()) {
+            libxml_disable_entity_loader($loadEntities);
+            libxml_use_internal_errors($useInternalXmlErrors);
+        }
+
+        if (isset($simpleXml)) {
+            $result = simplexml_import_dom($dom);
+            if (!$result instanceof SimpleXMLElement) {
+                return false;
+            }
+            return $result;
+        }
+        return $dom;
+    }
+
+    /**
+     * Scan XML file for potential XXE/XEE attacks
+     *
+     * @param  string $file
+     * @param  DOMDocument $dom
+     * @throws Exception\InvalidArgumentException
+     * @return SimpleXMLElement|DomDocument
+     */
+    public static function scanFile($file, DOMDocument $dom = null)
+    {
+        if (!file_exists($file)) {
+            throw new Exception\InvalidArgumentException(
+                "The file $file specified doesn't exist"
+            );
+        }
+        return self::scan(file_get_contents($file), $dom);
+    }
+
+    /**
+     * Return true if PHP is running with PHP-FPM
+     *
+     * This method is mainly used to determine whether or not heuristic checks
+     * (vs libxml checks) should be made, due to threading issues in libxml;
+     * under php-fpm, threading becomes a concern.
+     *
+     * However, PHP versions 5.5.22+ and 5.6.6+ contain a patch to the
+     * libxml support in PHP that makes the libxml checks viable; in such
+     * versions, this method will return false to enforce those checks, which
+     * are more strict and accurate than the heuristic checks.
+     *
+     * @return boolean
+     */
+    public static function isPhpFpm()
+    {
+        $isVulnerableVersion = (
+            version_compare(PHP_VERSION, '5.5.22', 'lt')
+            || (
+                version_compare(PHP_VERSION, '5.6', 'gte')
+                && version_compare(PHP_VERSION, '5.6.6', 'lt')
+            )
+        );
+
+        if (substr(php_sapi_name(), 0, 3) === 'fpm' && $isVulnerableVersion) {
+            return true;
+        }
+        return false;
+    }
+
+    /**
+     * Determine and return the string(s) to use for the <!ENTITY comparison.
+     *
+     * @param string $xml
+     * @return string[]
+     */
+    protected static function getEntityComparison($xml)
+    {
+        $encodingMap = self::getAsciiEncodingMap();
+        return array_map(function ($encoding) use ($encodingMap) {
+            $generator   = isset($encodingMap[$encoding]) ? $encodingMap[$encoding] : $encodingMap['UTF-8'];
+            return $generator('<!ENTITY');
+        }, self::detectXmlEncoding($xml, self::detectStringEncoding($xml)));
+    }
+
+    /**
+     * Determine the string encoding.
+     *
+     * Determines string encoding from either a detected BOM or a
+     * heuristic.
+     *
+     * @param string $xml
+     * @return string File encoding
+     */
+    protected static function detectStringEncoding($xml)
+    {
+        return self::detectBom($xml) ?: self::detectXmlStringEncoding($xml);
+    }
+
+    /**
+     * Attempt to match a known BOM.
+     *
+     * Iterates through the return of getBomMap(), comparing the initial bytes
+     * of the provided string to the BOM of each; if a match is determined,
+     * it returns the encoding.
+     *
+     * @param string $string
+     * @return false|string Returns encoding on success.
+     */
+    protected static function detectBom($string)
+    {
+        foreach (self::getBomMap() as $criteria) {
+            if (0 === strncmp($string, $criteria['bom'], $criteria['length'])) {
+                return $criteria['encoding'];
+            }
+        }
+        return false;
+    }
+
+    /**
+     * Attempt to detect the string encoding of an XML string.
+     *
+     * @param string $xml
+     * @return string Encoding
+     */
+    protected static function detectXmlStringEncoding($xml)
+    {
+        foreach (self::getAsciiEncodingMap() as $encoding => $generator) {
+            $prefix = $generator('<' . '?xml');
+            if (0 === strncmp($xml, $prefix, strlen($prefix))) {
+                return $encoding;
+            }
+        }
+
+        // Fallback
+        return 'UTF-8';
+    }
+
+    /**
+     * Attempt to detect the specified XML encoding.
+     *
+     * Using the file's encoding, determines if an "encoding" attribute is
+     * present and well-formed in the XML declaration; if so, it returns a
+     * list with both the ASCII representation of that declaration and the
+     * original file encoding.
+     *
+     * If not, a list containing only the provided file encoding is returned.
+     *
+     * @param string $xml
+     * @param string $fileEncoding
+     * @return string[] Potential XML encodings
+     */
+    protected static function detectXmlEncoding($xml, $fileEncoding)
+    {
+        $encodingMap = self::getAsciiEncodingMap();
+        $generator   = $encodingMap[$fileEncoding];
+        $encAttr     = $generator('encoding="');
+        $quote       = $generator('"');
+        $close       = $generator('>');
+
+        $closePos    = strpos($xml, $close);
+        if (false === $closePos) {
+            return array($fileEncoding);
+        }
+
+        $encPos = strpos($xml, $encAttr);
+        if (false === $encPos
+            || $encPos > $closePos
+        ) {
+            return array($fileEncoding);
+        }
+
+        $encPos   += strlen($encAttr);
+        $quotePos = strpos($xml, $quote, $encPos);
+        if (false === $quotePos) {
+            return array($fileEncoding);
+        }
+
+        $encoding = self::substr($xml, $encPos, $quotePos);
+        return array(
+            // Following line works because we're only supporting 8-bit safe encodings at this time.
+            str_replace('\0', '', $encoding), // detected encoding
+            $fileEncoding,                    // file encoding
+        );
+    }
+
+    /**
+     * Return a list of BOM maps.
+     *
+     * Returns a list of common encoding -> BOM maps, along with the character
+     * length to compare against.
+     *
+     * @link https://en.wikipedia.org/wiki/Byte_order_mark
+     * @return array
+     */
+    protected static function getBomMap()
+    {
+        return array(
+            array(
+                'encoding' => 'UTF-32BE',
+                'bom'      => pack('CCCC', 0x00, 0x00, 0xfe, 0xff),
+                'length'   => 4,
+            ),
+            array(
+                'encoding' => 'UTF-32LE',
+                'bom'      => pack('CCCC', 0xff, 0xfe, 0x00, 0x00),
+                'length'   => 4,
+            ),
+            array(
+                'encoding' => 'GB-18030',
+                'bom'      => pack('CCCC', 0x84, 0x31, 0x95, 0x33),
+                'length'   => 4,
+            ),
+            array(
+                'encoding' => 'UTF-16BE',
+                'bom'      => pack('CC', 0xfe, 0xff),
+                'length'   => 2,
+            ),
+            array(
+                'encoding' => 'UTF-16LE',
+                'bom'      => pack('CC', 0xff, 0xfe),
+                'length'   => 2,
+            ),
+            array(
+                'encoding' => 'UTF-8',
+                'bom'      => pack('CCC', 0xef, 0xbb, 0xbf),
+                'length'   => 3,
+            ),
+        );
+    }
+
+    /**
+     * Return a map of encoding => generator pairs.
+     *
+     * Returns a map of encoding => generator pairs, where the generator is a
+     * callable that accepts a string and returns the appropriate byte order
+     * sequence of that string for the encoding.
+     *
+     * @return array
+     */
+    protected static function getAsciiEncodingMap()
+    {
+        return array(
+            'UTF-32BE'   => function ($ascii) {
+                return preg_replace('/(.)/', "\0\0\0\\1", $ascii);
+            },
+            'UTF-32LE'   => function ($ascii) {
+                return preg_replace('/(.)/', "\\1\0\0\0", $ascii);
+            },
+            'UTF-32odd1' => function ($ascii) {
+                return preg_replace('/(.)/', "\0\\1\0\0", $ascii);
+            },
+            'UTF-32odd2' => function ($ascii) {
+                return preg_replace('/(.)/', "\0\0\\1\0", $ascii);
+            },
+            'UTF-16BE'   => function ($ascii) {
+                return preg_replace('/(.)/', "\0\\1", $ascii);
+            },
+            'UTF-16LE'   => function ($ascii) {
+                return preg_replace('/(.)/', "\\1\0", $ascii);
+            },
+            'UTF-8'      => function ($ascii) {
+                return $ascii;
+            },
+            'GB-18030'   => function ($ascii) {
+                return $ascii;
+            },
+        );
+    }
+
+    /**
+     * Binary-safe substr.
+     *
+     * substr() is not binary-safe; this method loops by character to ensure
+     * multi-byte characters are aggregated correctly.
+     *
+     * @param string $string
+     * @param int $start
+     * @param int $end
+     * @return string
+     */
+    protected static function substr($string, $start, $end)
+    {
+        $substr = '';
+        for ($i = $start; $i < $end; $i += 1) {
+            $substr .= $string[$i];
+        }
+        return $substr;
+    }
+}