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<title>[36453] branches/3.8: Better validation of the URL used in HTTP redirects.</title>
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<dt style="float: left; width: 6em; font-weight: bold">Revision</dt> <dd><a style="font-weight: bold" href="https://core.trac.wordpress.org/changeset/36453">36453</a><script type="application/ld+json">{"@context":"http://schema.org","@type":"EmailMessage","description":"Review this Commit","action":{"@type":"ViewAction","url":"https://core.trac.wordpress.org/changeset/36453","name":"Review Commit"}}</script></dd>
<dt style="float: left; width: 6em; font-weight: bold">Author</dt> <dd>ocean90</dd>
<dt style="float: left; width: 6em; font-weight: bold">Date</dt> <dd>2016-02-02 16:59:31 +0000 (Tue, 02 Feb 2016)</dd>
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<pre style='padding-left: 1em; margin: 2em 0; border-left: 2px solid #ccc; line-height: 1.25; font-size: 105%; font-family: sans-serif'>Better validation of the URL used in HTTP redirects.

Merges <a href="https://core.trac.wordpress.org/changeset/36444">[36444]</a> to the 3.8 branch.</pre>

<h3>Modified Paths</h3>
<ul>
<li><a href="#branches38srcwpincludespluggablephp">branches/3.8/src/wp-includes/pluggable.php</a></li>
<li><a href="#branches38testsphpunittestsformattingredirectphp">branches/3.8/tests/phpunit/tests/formatting/redirect.php</a></li>
</ul>

</div>
<div id="patch">
<h3>Diff</h3>
<a id="branches38srcwpincludespluggablephp"></a>
<div class="modfile"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Modified: branches/3.8/src/wp-includes/pluggable.php</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- branches/3.8/src/wp-includes/pluggable.php        2016-02-02 16:59:27 UTC (rev 36452)
+++ branches/3.8/src/wp-includes/pluggable.php  2016-02-02 16:59:31 UTC (rev 36453)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -973,7 +973,8 @@
</span><span class="cx" style="display: block; padding: 0 10px">        // In php 5 parse_url may fail if the URL query part contains http://, bug #38143
</span><span class="cx" style="display: block; padding: 0 10px">        $test = ( $cut = strpos($location, '?') ) ? substr( $location, 0, $cut ) : $location;
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-        $lp  = parse_url($test);
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ // @-operator is used to prevent possible warnings in PHP < 5.3.3.
+       $lp = @parse_url($test);
</ins><span class="cx" style="display: block; padding: 0 10px"> 
</span><span class="cx" style="display: block; padding: 0 10px">        // Give up if malformed URL
</span><span class="cx" style="display: block; padding: 0 10px">        if ( false === $lp )
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -983,10 +984,18 @@
</span><span class="cx" style="display: block; padding: 0 10px">        if ( isset($lp['scheme']) && !('http' == $lp['scheme'] || 'https' == $lp['scheme']) )
</span><span class="cx" style="display: block; padding: 0 10px">                return $default;
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-        // Reject if scheme is set but host is not. This catches urls like https:host.com for which parse_url does not set the host field.
-       if ( isset($lp['scheme'])  && !isset($lp['host']) )
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ // Reject if certain components are set but host is not. This catches urls like https:host.com for which parse_url does not set the host field.
+       if ( ! isset( $lp['host'] ) && ( isset( $lp['scheme'] ) || isset( $lp['user'] ) || isset( $lp['pass'] ) || isset( $lp['port'] ) ) ) {
</ins><span class="cx" style="display: block; padding: 0 10px">                 return $default;
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+        }
</ins><span class="cx" style="display: block; padding: 0 10px"> 
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+        // Reject malformed components parse_url() can return on odd inputs.
+       foreach ( array( 'user', 'pass', 'host' ) as $component ) {
+               if ( isset( $lp[ $component ] ) && strpbrk( $lp[ $component ], ':/?#@' ) ) {
+                       return $default;
+               }
+       }
+
</ins><span class="cx" style="display: block; padding: 0 10px">         $wpp = parse_url(home_url());
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><span class="cx" style="display: block; padding: 0 10px">        $allowed_hosts = (array) apply_filters('allowed_redirect_hosts', array($wpp['host']), isset($lp['host']) ? $lp['host'] : '');
</span></span></pre></div>
<a id="branches38testsphpunittestsformattingredirectphp"></a>
<div class="modfile"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Modified: branches/3.8/tests/phpunit/tests/formatting/redirect.php</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- branches/3.8/tests/phpunit/tests/formatting/redirect.php  2016-02-02 16:59:27 UTC (rev 36452)
+++ branches/3.8/tests/phpunit/tests/formatting/redirect.php    2016-02-02 16:59:31 UTC (rev 36453)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -3,8 +3,21 @@
</span><span class="cx" style="display: block; padding: 0 10px"> /**
</span><span class="cx" style="display: block; padding: 0 10px">  * @group pluggable
</span><span class="cx" style="display: block; padding: 0 10px">  * @group formatting
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ * @group redirect
</ins><span class="cx" style="display: block; padding: 0 10px">  */
</span><span class="cx" style="display: block; padding: 0 10px"> class Tests_Formatting_Redirect extends WP_UnitTestCase {
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+        function setUp() {
+               add_filter( 'home_url', array( $this, 'home_url' ) );
+       }
+
+       function tearDown() {
+               remove_filter( 'home_url', array( $this, 'home_url' ) );
+       }
+
+       function home_url() {
+               return 'http://example.com/';
+       }
+
</ins><span class="cx" style="display: block; padding: 0 10px">         function test_wp_sanitize_redirect() {
</span><span class="cx" style="display: block; padding: 0 10px">                $this->assertEquals('http://example.com/watchthelinefeedgo', wp_sanitize_redirect('http://example.com/watchthelinefeed%0Ago'));
</span><span class="cx" style="display: block; padding: 0 10px">                $this->assertEquals('http://example.com/watchthelinefeedgo', wp_sanitize_redirect('http://example.com/watchthelinefeed%0ago'));
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -14,4 +27,96 @@
</span><span class="cx" style="display: block; padding: 0 10px">                $this->assertEquals('http://example.com/watchthecarriagereturngo', wp_sanitize_redirect('http://example.com/watchthecarriagereturn%0%0ddgo'));
</span><span class="cx" style="display: block; padding: 0 10px">                $this->assertEquals('http://example.com/watchthecarriagereturngo', wp_sanitize_redirect('http://example.com/watchthecarriagereturn%0%0DDgo'));
</span><span class="cx" style="display: block; padding: 0 10px">        }
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+
+       /**
+        * @dataProvider valid_url_provider
+        */
+       function test_wp_validate_redirect_valid_url( $url, $expected ) {
+               $this->assertEquals( $expected, wp_validate_redirect( $url ) );
+       }
+
+       /**
+        * @dataProvider invalid_url_provider
+        */
+       function test_wp_validate_redirect_invalid_url( $url ) {
+               $this->assertEquals( false, wp_validate_redirect( $url, false ) );
+       }
+
+       function valid_url_provider() {
+               return array(
+                       array( 'http://example.com', 'http://example.com' ),
+                       array( 'http://example.com/', 'http://example.com/' ),
+                       array( 'https://example.com/', 'https://example.com/' ),
+                       array( '//example.com', 'http://example.com' ),
+                       array( '//example.com/', 'http://example.com/' ),
+                       array( 'http://example.com/?foo=http://example.com/', 'http://example.com/?foo=http://example.com/' ),
+                       array( 'http://user@example.com/', 'http://user@example.com/' ),
+                       array( 'http://user:@example.com/', 'http://user:@example.com/' ),
+                       array( 'http://user:pass@example.com/', 'http://user:pass@example.com/' ),
+               );
+       }
+
+       function invalid_url_provider() {
+               return array(
+                       // parse_url() fails
+                       array( '' ),
+                       array( 'http://:' ),
+
+                       // non-safelisted domain
+                       array( 'http://non-safelisted.example/' ),
+
+                       // unsupported schemes
+                       array( 'data:text/plain;charset=utf-8,Hello%20World!' ),
+                       array( 'file:///etc/passwd' ),
+                       array( 'ftp://example.com/' ),
+
+                       // malformed input
+                       array( 'http:example.com' ),
+                       array( 'http:80' ),
+                       array( 'http://example.com:1234:5678/' ),
+                       array( 'http://user:pa:ss@example.com/' ),
+
+                       array( 'http://user@@example.com' ),
+                       array( 'http://user@:example.com' ),
+                       array( 'http://user?@example.com' ),
+                       array( 'http://user@?example.com' ),
+                       array( 'http://user#@example.com' ),
+                       array( 'http://user@#example.com' ),
+
+                       array( 'http://user@@example.com/' ),
+                       array( 'http://user@:example.com/' ),
+                       array( 'http://user?@example.com/' ),
+                       array( 'http://user@?example.com/' ),
+                       array( 'http://user#@example.com/' ),
+                       array( 'http://user@#example.com/' ),
+
+                       array( 'http://user:pass@@example.com' ),
+                       array( 'http://user:pass@:example.com' ),
+                       array( 'http://user:pass?@example.com' ),
+                       array( 'http://user:pass@?example.com' ),
+                       array( 'http://user:pass#@example.com' ),
+                       array( 'http://user:pass@#example.com' ),
+
+                       array( 'http://user:pass@@example.com/' ),
+                       array( 'http://user:pass@:example.com/' ),
+                       array( 'http://user:pass?@example.com/' ),
+                       array( 'http://user:pass@?example.com/' ),
+                       array( 'http://user:pass#@example.com/' ),
+                       array( 'http://user:pass@#example.com/' ),
+
+                       array( 'http://user.pass@@example.com' ),
+                       array( 'http://user.pass@:example.com' ),
+                       array( 'http://user.pass?@example.com' ),
+                       array( 'http://user.pass@?example.com' ),
+                       array( 'http://user.pass#@example.com' ),
+                       array( 'http://user.pass@#example.com' ),
+
+                       array( 'http://user.pass@@example.com/' ),
+                       array( 'http://user.pass@:example.com/' ),
+                       array( 'http://user.pass?@example.com/' ),
+                       array( 'http://user.pass@?example.com/' ),
+                       array( 'http://user.pass#@example.com/' ),
+                       array( 'http://user.pass@#example.com/' ),
+               );
+       }
</ins><span class="cx" style="display: block; padding: 0 10px"> }
</span></span></pre>
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