Washtml.php
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Washtml.php
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	<?php

	/**
	* Test class to test rcube_washtml class
	*
	* @package Tests
	*/
	class Framework_Washtml extends PHPUnit\Framework\TestCase
	{
	/**
	* A helper method to remove comments added by rcube_washtml
	*/
	function cleanupResult($html)
	{
	return preg_replace('/<!-- [a-z]+ (ignored\|not allowed) -->/', '', $html);
	}


	/**
	* Test the elimination of some XSS vulnerabilities
	*/
	function test_html_xss()
	{
	// #1488850
	$html = '<a href="data:text/html,<script>alert(document.cookie)</script>">Firefox</a>'
	.'<a href="vbscript:alert(document.cookie)">Internet Explorer</a></p>'
	.'<A href="data:text/html,<script>alert(document.cookie)</script>">Firefox</a>'
	.'<A HREF="vbscript:alert(document.cookie)">Internet Explorer</a>'
	.'<a href="data:application/xhtml+xml;base64,PGh0bW">CLICK ME</a>'; // #6896

	$washer = new rcube_washtml;
	$washed = $washer->wash($html);

	$this->assertNotRegExp('/data:text/', $washed, "Remove data:text/html links");
	$this->assertNotRegExp('/vbscript:/', $washed, "Remove vbscript: links");
	$this->assertNotRegExp('/data:application/', $washed, "Remove data:application links");
	}

	/**
	* Test fixing of invalid href
	*/
	function test_href()
	{
	$html = "<p><a href=\"\nhttp://test.com\n\">Firefox</a><a href=\"domain.com\">Firefox</a>";

	$washer = new rcube_washtml;
	$washed = $washer->wash($html);

	$this->assertRegExp('\|href="http://test\.com"\|', $washed, "Link href with newlines (#1488940)");
	$this->assertRegExp('\|href="http://domain\.com"\|', $washed, "Link href with no protocol (#7454)");
	}

	/**
	* Test XSS in area's href (#5240)
	*/
	function test_href_area()
	{
	$html = '<p><area href="data:text/html,<script>alert(document.cookie)</script>">'
	. '<area href="vbscript:alert(document.cookie)">Internet Explorer</p>'
	. '<area href="javascript:alert(document.domain)" shape=default>'
	. '<p><AREA HREF="data:text/html,<script>alert(document.cookie)</script>">'
	. '<Area href="vbscript:alert(document.cookie)">Internet Explorer</p>'
	. '<area HREF="javascript:alert(document.domain)" shape=default>';

	$washer = new rcube_washtml;
	$washed = $washer->wash($html);

	$this->assertNotRegExp('/data:text/', $washed, "data:text/html in area href");
	$this->assertNotRegExp('/vbscript:/', $washed, "vbscript: in area href");
	$this->assertNotRegExp('/javascript:/', $washed, "javascript: in area href");
	}

	/**
	* Test handling HTML comments
	*/
	function test_comments()
	{
	$washer = new rcube_washtml;

	$html = "<!--[if gte mso 10]><p>p1</p><!--><p>p2</p>";
	$washed = $this->cleanupResult($washer->wash($html));

	$this->assertEquals('<p>p2</p>', $washed, "HTML conditional comments (#1489004)");

	$html = "<!--TestCommentInvalid><p>test</p>";
	$washed = $this->cleanupResult($washer->wash($html));

	$this->assertEquals('<p>test</p>', $washed, "HTML invalid comments (#1487759)");

	$html = "<p>para1</p><!-- comment --><p>para2</p>";
	$washed = $this->cleanupResult($washer->wash($html));

	$this->assertEquals('<p>para1</p><p>para2</p>', $washed, "HTML comments - simple comment");

	$html = "<p>para1</p><!-- <hr> comment --><p>para2</p>";
	$washed = $this->cleanupResult($washer->wash($html));

	$this->assertEquals('<p>para1</p><p>para2</p>', $washed, "HTML comments - tags inside (#1489904)");

	$html = "<p>para1</p><!-- comment => comment --><p>para2</p>";
	$washed = $this->cleanupResult($washer->wash($html));

	$this->assertEquals('<p>para1</p><p>para2</p>', $washed, "HTML comments - bracket inside");

	$html = "<p><!-- span>1</span -->\n<span>2</span>\n<!-- >3</span --><span>4</span></p>";
	$washed = $this->cleanupResult($washer->wash($html));

	$this->assertEquals("<p>\n<span>2</span>\n<span>4</span></p>", $washed, "HTML comments (#6464)");
	}

	/**
	* Test fixing of invalid self-closing elements (#1489137)
	*/
	function test_self_closing()
	{
	$html = "<textarea>test";

	$washer = new rcube_washtml;
	$washed = $washer->wash($html);

	$this->assertRegExp('\|<textarea>test</textarea>\|', $washed, "Self-closing textarea (#1489137)");
	}

	/**
	* Test fixing of invalid closing tags (#1489446)
	*/
	function test_closing_tag_attrs()
	{
	$html = "<a href=\"http://test.com\">test</a href>";

	$washer = new rcube_washtml;
	$washed = $washer->wash($html);

	$this->assertRegExp('\|</a>\|', $washed, "Invalid closing tag (#1489446)");
	}

	/**
	* Test fixing of invalid lists nesting (#1488768)
	*/
	function test_lists()
	{
	$data = array(
	array(
	"<ol><li>First</li><li>Second</li><ul><li>First sub</li></ul><li>Third</li></ol>",
	"<ol><li>First</li><li>Second<ul><li>First sub</li></ul></li><li>Third</li></ol>"
	),
	array(
	"<ol><li>First<ul><li>First sub</li></ul></li></ol>",
	"<ol><li>First<ul><li>First sub</li></ul></li></ol>",
	),
	array(
	"<ol><li>First<ol><li>First sub</li></ol></li></ol>",
	"<ol><li>First<ol><li>First sub</li></ol></li></ol>",
	),
	array(
	"<ul><li>First</li><ul><li>First sub</li><ul><li>sub sub</li></ul></ul><li></li></ul>",
	"<ul><li>First<ul><li>First sub<ul><li>sub sub</li></ul></li></ul></li><li></li></ul>",
	),
	array(
	"<ul><li>First</li><li>second</li><ul><ul><li>sub sub</li></ul></ul></ul>",
	"<ul><li>First</li><li>second<ul><ul><li>sub sub</li></ul></ul></li></ul>",
	),
	array(
	"<ol><ol><ol></ol></ol></ol>",
	"<ol><ol><ol></ol></ol></ol>",
	),
	array(
	"<div><ol><ol><ol></ol></ol></ol></div>",
	"<div><ol><ol><ol></ol></ol></ol></div>",
	),
	);

	foreach ($data as $element) {
	rcube_washtml::fix_broken_lists($element[0]);

	$this->assertSame($element[1], $element[0], "Broken nested lists (#1488768)");
	}
	}

	/**
	* Test color style handling (#1489697)
	*/
	function test_color_style()
	{
	$html = "<p style=\"font-size: 10px; color: rgb(241, 245, 218)\">a</p>";

	$washer = new rcube_washtml;
	$washed = $washer->wash($html);

	$this->assertRegExp('\|color: rgb$241, 245, 218$\|', $washed, "Color style (#1489697)");
	$this->assertRegExp('\|font-size: 10px\|', $washed, "Font-size style");
	}

	/**
	* Test handling of unicode chars in style (#1489777)
	*/
	function test_style_unicode()
	{
	$html = "<html><meta http-equiv=\"Content-Type\" content=\"text/html; charset=utf-8\" />
	<body><span style='font-family:\"新細明體\",\"serif\";color:red'>test</span></body></html>";

	$washer = new rcube_washtml;
	$washed = $washer->wash($html);

	$this->assertRegExp('\|style="font-family: \"新細明體\",\"serif\"; color: red"\|', $washed, "Unicode chars in style attribute - quoted (#1489697)");

	$html = "<html><meta http-equiv=\"Content-Type\" content=\"text/html; charset=utf-8\" />
	<body><span style='font-family:新細明體;color:red'>test</span></body></html>";

	$washer = new rcube_washtml;
	$washed = $washer->wash($html);

	$this->assertRegExp('\|style="font-family: 新細明體; color: red"\|', $washed, "Unicode chars in style attribute (#1489697)");
	}

	/**
	* Test deprecated body attributes (#7109)
	*/
	function test_style_body_attrs()
	{
	$html = "<html><meta http-equiv=\"Content-Type\" content=\"text/html; charset=utf-8\" />
	<body bgcolor=\"#fff\" text=\"#000\" background=\"#test\" link=\"#111\" alink=\"#222\" vlink=\"#333\">
	</body></html>";

	$washer = new rcube_washtml(array('html_elements' => array('body')));
	$washed = $washer->wash($html);

	$this->assertRegExp('\|bgcolor="#fff"\|', $washed, "Body bgcolor attribute");
	$this->assertRegExp('\|text="#000"\|', $washed, "Body text attribute");
	$this->assertRegExp('\|background="#test"\|', $washed, "Body background attribute");
	$this->assertRegExp('\|link="#111"\|', $washed, "Body link attribute");
	$this->assertRegExp('\|alink="#222"\|', $washed, "Body alink attribute");
	$this->assertRegExp('\|vlink="#333"\|', $washed, "Body vlink attribute");
	}

	/**
	* Test style item fixes
	*/
	function test_style_wash()
	{
	$html = "<p style=\"line-height: 1; height: 10\">a</p>";

	$washer = new rcube_washtml;
	$washed = $washer->wash($html);

	$this->assertRegExp('\|line-height: 1;\|', $washed, "Untouched line-height (#1489917)");
	$this->assertRegExp('\|; height: 10px\|', $washed, "Fixed height units");

	$html = "<div style=\"padding: 0px\n 20px;border:1px solid #000;\"></div>";
	$expected = "<div style=\"padding: 0px 20px; border: 1px solid #000\"></div>";

	$washer = new rcube_washtml;
	$washed = $washer->wash($html);

	$this->assertTrue(strpos($washed, $expected) !== false, "White-space and new-line characters handling");
	}

	/**
	* Test invalid style cleanup - XSS prevention (#1490227)
	*/
	function test_style_wash_xss()
	{
	$html = "<img style=aaa:'\"/onerror=alert(1)//'>";
	$exp = "<img style=\"aaa: '"/onerror=alert(1)//'\" />";

	$washer = new rcube_washtml;
	$washed = $washer->wash($html);

	$this->assertTrue(strpos($washed, $exp) !== false, "Style quotes XSS issue (#1490227)");

	$html = "<img style=aaa:'"/onerror=alert(1)//'>";
	$exp = "<img style=\"aaa: '"/onerror=alert(1)//'\" />";

	$washer = new rcube_washtml;
	$washed = $washer->wash($html);

	$this->assertTrue(strpos($washed, $exp) !== false, "Style quotes XSS issue (#1490227)");
	}

	/**
	* Test SVG cleanup
	*/
	function test_wash_svg()
	{
	$svg = '<?xml version="1.0" standalone="no"?>
	<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">
	<svg version="1.1" baseProfile="full" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:cc="http://creativecommons.org/ns#" viewBox="0 0 100 100">
	<polygon id="triangle" points="0,0 0,50 50,0" fill="#009900" stroke="#004400" onmouseover="alert(1)" />
	<text x="50" y="68" font-size="48" fill="#FFF" text-anchor="middle"><![CDATA[410]]></text>
	<script type="text/javascript">
	alert(document.cookie);
	</script>
	<text x="10" y="25" >An example text</text>
	<a xlink:href="http://www.w.pl"><rect width="100%" height="100%" /></a>
	<foreignObject xlink:href="data:text/xml,%3Cscript xmlns=\'http://www.w3.org/1999/xhtml\'%3Ealert(1)%3C/script%3E"/>
	<set attributeName="onmouseover" to="alert(1)"/>
	<animate attributeName="onunload" to="alert(1)"/>
	<animate attributeName="xlink:href" begin="0" from="javascript:alert(1)" />
	</svg>';

	$exp = '<svg xmlns:cc="http://creativecommons.org/ns#" xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns="http://www.w3.org/2000/svg" version="1.1" baseProfile="full" viewBox="0 0 100 100">
	<polygon id="triangle" points="0,0 0,50 50,0" fill="#009900" stroke="#004400" x-washed="onmouseover" />
	<text x="50" y="68" font-size="48" fill="#FFF" text-anchor="middle">410</text>
	<!-- script not allowed -->
	<text x="10" y="25">An example text</text>
	<a xlink:href="http://www.w.pl"><rect width="100%" height="100%" /></a>
	<!-- foreignObject ignored -->
	<set attributeName="onmouseover" x-washed="to" />
	<animate attributeName="onunload" x-washed="to" />
	<animate attributeName="xlink:href" begin="0" x-washed="from" />
	</svg>';

	$washer = new rcube_washtml;
	$washed = $washer->wash($svg);

	$this->assertSame($washed, $exp, "SVG content");
	}

	/**
	* Test SVG cleanup
	*/
	function test_wash_svg2()
	{
	$svg = '<head xmlns=""><script>alert(document.domain)</script>"><svg></svg></head>';
	$exp = '<!-- html ignored --><!-- head ignored --><svg xmlns="http://www.w3.org/1999/xhtml"></svg>';

	$washer = new rcube_washtml;
	$washed = $washer->wash($svg);

	$this->assertSame($washed, $exp, "SVG content");

	$svg = '<head xmlns="" onload="alert(document.domain)">Hello victim!<svg></svg></head>';
	$exp = '<!-- html ignored --><!-- head ignored -->Hello victim!<svg xmlns="http://www.w3.org/1999/xhtml"></svg>';

	$washer = new rcube_washtml;
	$washed = $washer->wash($svg);

	$this->assertSame($washed, $exp, "SVG content");

	$svg = '<p>Hello victim!<svg xmlns="" onload="alert(document.domain)"></svg></p>';
	$exp = '<p>Hello victim!<svg /></p>';

	$washer = new rcube_washtml;
	$washed = $washer->wash($svg);

	$this->assertSame($washed, $exp, "SVG content");

	$svg = '<svg xmlns="" onload="alert(document.domain)" />';
	$exp = '<svg xmlns="" onload="alert(document.domain)" />';

	$washer = new rcube_washtml;
	$washed = $washer->wash($svg);

	$this->assertSame($washed, $exp, "SVG content");
	}

	/**
	* Test position:fixed cleanup - (#5264)
	*/
	function test_style_wash_position_fixed()
	{
	$html = "<img style='position:fixed' /><img style=\"position:/**/ fixed; top:10px\" />";
	$exp = "<img style=\"position: absolute\" /><img style=\"position: absolute; top: 10px\" />";

	$washer = new rcube_washtml;
	$washed = $washer->wash($html);

	$this->assertTrue(strpos($washed, $exp) !== false, "Position:fixed (#5264)");
	}

	/**
	* Test MathML cleanup
	*/
	function test_wash_mathml()
	{
	$mathml = '<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body>
	<math><semantics>
	<mrow>
	<msub><mi>I</mi><mi>D</mi></msub>
	<mo>=</mo>
	<mfrac><mn>1</mn><mn>2</mn></mfrac>
	<msub><mi>k</mi><mi>n</mi></msub>
	<mfrac><mi>W</mi><mi>L</mi></mfrac>
	<mo stretchy="false">(</mo>
	<msub><mi>V</mi><mrow><mi>G</mi><mi>S</mi></mrow></msub>
	<mo>-</mo><msub><mi>V</mi><mi>t</mi></msub><msup>
	<mo stretchy="false">)</mo><mn>2</mn></msup>
	</mrow>
	<annotation encoding="TeX">I_D = \frac{1}{2} k_n \frac{W}{L} (V_{GS}-V_t)^2</annotation>
	</semantics></math>
	</body></html>';

	$exp = '<!-- html ignored --><!-- head ignored --><!-- meta ignored --><!-- body ignored -->
	<math><semantics>
	<mrow>
	<msub><mi>I</mi><mi>D</mi></msub>
	<mo>=</mo>
	<mfrac><mn>1</mn><mn>2</mn></mfrac>
	<msub><mi>k</mi><mi>n</mi></msub>
	<mfrac><mi>W</mi><mi>L</mi></mfrac>
	<mo stretchy="false">(</mo>
	<msub><mi>V</mi><mrow><mi>G</mi><mi>S</mi></mrow></msub>
	<mo>-</mo><msub><mi>V</mi><mi>t</mi></msub><msup>
	<mo stretchy="false">)</mo><mn>2</mn></msup>
	</mrow>
	<annotation encoding="TeX">I_D = \frac{1}{2} k_n \frac{W}{L} (V_{GS}-V_t)^2</annotation>
	</semantics></math>';

	$washer = new rcube_washtml;
	$washed = $washer->wash($mathml);

	// remove whitespace between tags
	$washed = preg_replace('/>[\s\r\n\t]+</', '><', $washed);
	$exp = preg_replace('/>[\s\r\n\t]+</', '><', $exp);

	$this->assertSame(trim($washed), trim($exp), "MathML content");
	}

	/**
	* Test external links in src of input/video elements (#5583)
	*/
	function test_src_wash()
	{
	$html = "<input type=\"image\" src=\"http://TRACKING_URL/\">";

	$washer = new rcube_washtml;
	$washed = $washer->wash($html);

	$this->assertTrue($washer->extlinks);
	$this->assertNotContains('TRACKING', $washed, "Src attribute of <input> tag (#5583)");

	$html = "<video src=\"http://TRACKING_URL/\">";

	$washer = new rcube_washtml;
	$washed = $washer->wash($html);

	$this->assertTrue($washer->extlinks);
	$this->assertNotContains('TRACKING', $washed, "Src attribute of <video> tag (#5583)");
	}

	/**
	* Test external links
	*/
	function test_extlinks()
	{
	$html = array(
	array("<link href=\"http://TRACKING_URL/\">", true),
	array("<link href=\"src:abc\">", false),
	array("<img src=\"http://TRACKING_URL/\">", true),
	array("<img src=\"data:image\">", false),
	array('<p style="backgr\\ound-image: \\ur\\l(\'http://TRACKING_URL\')"></p>', true),
	);

	foreach ($html as $item) {
	$washer = new rcube_washtml;
	$washed = $washer->wash($item[0]);

	$this->assertSame($item[1], $washer->extlinks);
	}

	foreach ($html as $item) {
	$washer = new rcube_washtml(array('allow_remote' => true));
	$washed = $washer->wash($item[0]);

	$this->assertFalse($washer->extlinks);
	}
	}

	function test_textarea_content_escaping()
	{
	$html = '<textarea><p style="x:</textarea><img src=x onerror=alert(1)>">';

	$washer = new rcube_washtml;
	$washed = $washer->wash($html);

	$this->assertNotContains('onerror=alert(1)>', $washed);
	$this->assertContains('<p style="x:', $washed);
	}

	/**
	* Test css_prefix feature
	*/
	function test_css_prefix()
	{
	$washer = new rcube_washtml(array('css_prefix' => 'test'));

	$html = '<p id="my-id">'
	. '<label for="my-other-id" class="my-class1 my-class2">test</label>'
	. '<a href="#my-id">link</a>'
	. '</p>';
	$washed = $washer->wash($html);

	$this->assertContains('id="testmy-id"', $washed);
	$this->assertContains('for="testmy-other-id"', $washed);
	$this->assertContains('href="#testmy-id"', $washed);
	$this->assertContains('class="testmy-class1 testmy-class2"', $washed);
	}

	/**
	* Test removing xml:namespace tag
	*/
	function test_xml_namespace()
	{
	$html = '<p><?xml:namespace prefix = "xsl" /></p>';

	$washer = new rcube_washtml;
	$washed = $this->cleanupResult($washer->wash($html));

	$this->assertNotContains('<?xml:namespace"', $washed);
	$this->assertSame($washed, '<p></p>');
	}

	/**
	* Test missing main HTML hierarchy tags (#6713)
	*/
	function test_missing_tags()
	{
	$washer = new rcube_washtml();

	$html = '<head></head>First line<br />Second line';
	$washed = $washer->wash($html);

	$this->assertContains('First line', $washed);

	$html = 'First line<br />Second line';
	$washed = $washer->wash($html);

	$this->assertContains('First line', $washed);

	$html = '<html>First line<br />Second line</html>';
	$washed = $washer->wash($html);

	$this->assertContains('>First line', $washed);

	$html = '<html><head></head>First line<br />Second line</html>';
	$washed = $washer->wash($html);

	$this->assertContains('First line', $washed);

	// Not really valid HTML, but because its common in email world
	// and because it works with DOMDocument, we make sure its supported
	$html = 'First line<br /><html><body>Second line';
	$washed = $washer->wash($html);

	$this->assertContains('First line', $washed);

	$html = 'First line<br /><html>Second line';
	$washed = $washer->wash($html);

	$this->assertContains('First line', $washed);
	}

	/**
	* Test CDATA cleanup
	*/
	function test_cdata()
	{
	$html = '<p><![CDATA[<script>alert(document.cookie)</script>]]></p>';

	$washer = new rcube_washtml;
	$washed = $washer->wash($html);

	$this->assertTrue(strpos($washed, '<script>') === false, "CDATA content");
	}
	}

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