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<title>[24480] trunk: Better validation of the URL used in core HTTP requests.</title>
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<div id="msg">
<dl class="meta">
<dt>Revision</dt> <dd><a href="http://core.trac.wordpress.org/changeset/24480">24480</a></dd>
<dt>Author</dt> <dd>nacin</dd>
<dt>Date</dt> <dd>2013-06-21 06:07:47 +0000 (Fri, 21 Jun 2013)</dd>
</dl>
<h3>Log Message</h3>
<pre>Better validation of the URL used in core HTTP requests.</pre>
<h3>Modified Paths</h3>
<ul>
<li><a href="#trunkwpadminincludesclasswpimporterphp">trunk/wp-admin/includes/class-wp-importer.php</a></li>
<li><a href="#trunkwpadminincludesfilephp">trunk/wp-admin/includes/file.php</a></li>
<li><a href="#trunkwpincludesclassfeedphp">trunk/wp-includes/class-feed.php</a></li>
<li><a href="#trunkwpincludesclasshttpphp">trunk/wp-includes/class-http.php</a></li>
<li><a href="#trunkwpincludesclassoembedphp">trunk/wp-includes/class-oembed.php</a></li>
<li><a href="#trunkwpincludesclasswpxmlrpcserverphp">trunk/wp-includes/class-wp-xmlrpc-server.php</a></li>
<li><a href="#trunkwpincludescommentphp">trunk/wp-includes/comment.php</a></li>
<li><a href="#trunkwpincludesfunctionsphp">trunk/wp-includes/functions.php</a></li>
<li><a href="#trunkwpincludeshttpphp">trunk/wp-includes/http.php</a></li>
<li><a href="#trunkwpincludesrssphp">trunk/wp-includes/rss.php</a></li>
</ul>
</div>
<div id="patch">
<h3>Diff</h3>
<a id="trunkwpadminincludesclasswpimporterphp"></a>
<div class="modfile"><h4>Modified: trunk/wp-admin/includes/class-wp-importer.php (24479 => 24480)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/wp-admin/includes/class-wp-importer.php 2013-06-21 06:02:58 UTC (rev 24479)
+++ trunk/wp-admin/includes/class-wp-importer.php 2013-06-21 06:07:47 UTC (rev 24480)
</span><span class="lines">@@ -183,6 +183,7 @@
</span><span class="cx">
</span><span class="cx"> $headers = array();
</span><span class="cx"> $args = array();
</span><ins>+ $args['reject_unsafe_urls'] = true;
</ins><span class="cx"> if ( true === $head )
</span><span class="cx"> $args['method'] = 'HEAD';
</span><span class="cx"> if ( !empty( $username ) && !empty( $password ) )
</span></span></pre></div>
<a id="trunkwpadminincludesfilephp"></a>
<div class="modfile"><h4>Modified: trunk/wp-admin/includes/file.php (24479 => 24480)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/wp-admin/includes/file.php 2013-06-21 06:02:58 UTC (rev 24479)
+++ trunk/wp-admin/includes/file.php 2013-06-21 06:07:47 UTC (rev 24480)
</span><span class="lines">@@ -497,7 +497,7 @@
</span><span class="cx"> if ( ! $tmpfname )
</span><span class="cx"> return new WP_Error('http_no_file', __('Could not create Temporary file.'));
</span><span class="cx">
</span><del>- $response = wp_remote_get( $url, array( 'timeout' => $timeout, 'stream' => true, 'filename' => $tmpfname ) );
</del><ins>+ $response = wp_remote_get( $url, array( 'timeout' => $timeout, 'stream' => true, 'filename' => $tmpfname, 'reject_unsafe_urls' => true ) );
</ins><span class="cx">
</span><span class="cx"> if ( is_wp_error( $response ) ) {
</span><span class="cx"> unlink( $tmpfname );
</span></span></pre></div>
<a id="trunkwpincludesclassfeedphp"></a>
<div class="modfile"><h4>Modified: trunk/wp-includes/class-feed.php (24479 => 24480)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/wp-includes/class-feed.php 2013-06-21 06:02:58 UTC (rev 24479)
+++ trunk/wp-includes/class-feed.php 2013-06-21 06:07:47 UTC (rev 24480)
</span><span class="lines">@@ -66,7 +66,11 @@
</span><span class="cx"> $this->method = SIMPLEPIE_FILE_SOURCE_REMOTE;
</span><span class="cx">
</span><span class="cx"> if ( preg_match('/^http(s)?:\/\//i', $url) ) {
</span><del>- $args = array( 'timeout' => $this->timeout, 'redirection' => $this->redirects);
</del><ins>+ $args = array(
+ 'timeout' => $this->timeout,
+ 'redirection' => $this->redirects,
+ 'reject_unsafe_urls' => true,
+ );
</ins><span class="cx">
</span><span class="cx"> if ( !empty($this->headers) )
</span><span class="cx"> $args['headers'] = $this->headers;
</span><span class="lines">@@ -85,10 +89,8 @@
</span><span class="cx"> $this->status_code = wp_remote_retrieve_response_code( $res );
</span><span class="cx"> }
</span><span class="cx"> } else {
</span><del>- if ( ! file_exists($url) || ( ! $this->body = file_get_contents($url) ) ) {
- $this->error = 'file_get_contents could not read the file';
- $this->success = false;
- }
</del><ins>+ $this->error = '';
+ $this->success = false;
</ins><span class="cx"> }
</span><span class="cx"> }
</span><span class="cx"> }
</span></span></pre></div>
<a id="trunkwpincludesclasshttpphp"></a>
<div class="modfile"><h4>Modified: trunk/wp-includes/class-http.php (24479 => 24480)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/wp-includes/class-http.php 2013-06-21 06:02:58 UTC (rev 24479)
+++ trunk/wp-includes/class-http.php 2013-06-21 06:07:47 UTC (rev 24480)
</span><span class="lines">@@ -86,7 +86,8 @@
</span><span class="cx"> 'timeout' => apply_filters( 'http_request_timeout', 5),
</span><span class="cx"> 'redirection' => apply_filters( 'http_request_redirection_count', 5),
</span><span class="cx"> 'httpversion' => apply_filters( 'http_request_version', '1.0'),
</span><del>- 'user-agent' => apply_filters( 'http_headers_useragent', 'WordPress/' . $wp_version . '; ' . get_bloginfo( 'url' ) ),
</del><ins>+ 'user-agent' => apply_filters( 'http_headers_useragent', 'WordPress/' . $wp_version . '; ' . get_bloginfo( 'url' ) ),
+ 'reject_unsafe_urls' => apply_filters( 'http_request_reject_unsafe_urls', false ),
</ins><span class="cx"> 'blocking' => true,
</span><span class="cx"> 'headers' => array(),
</span><span class="cx"> 'cookies' => array(),
</span><span class="lines">@@ -118,8 +119,12 @@
</span><span class="cx"> if ( false !== $pre )
</span><span class="cx"> return $pre;
</span><span class="cx">
</span><del>- $arrURL = parse_url( $url );
</del><ins>+ if ( $r['reject_unsafe_urls'] )
+ $url = wp_http_validate_url( $url );
+ $url = wp_kses_bad_protocol( $url, array( 'http', 'https', 'ssl' ) );
</ins><span class="cx">
</span><ins>+ $arrURL = @parse_url( $url );
+
</ins><span class="cx"> if ( empty( $url ) || empty( $arrURL['scheme'] ) )
</span><span class="cx"> return new WP_Error('http_request_failed', __('A valid URL was not provided.'));
</span><span class="cx">
</span><span class="lines">@@ -1146,6 +1151,8 @@
</span><span class="cx"> // The option doesn't work with safe mode or when open_basedir is set, and there's a
</span><span class="cx"> // bug #17490 with redirected POST requests, so handle redirections outside Curl.
</span><span class="cx"> curl_setopt( $handle, CURLOPT_FOLLOWLOCATION, false );
</span><ins>+ if ( defined( 'CURLOPT_PROTOCOLS' ) ) // PHP 5.2.10 / cURL 7.19.4
+ curl_setopt( $handle, CURLOPT_PROTOCOLS, CURLPROTO_HTTP | CURLPROTO_HTTPS );
</ins><span class="cx">
</span><span class="cx"> switch ( $r['method'] ) {
</span><span class="cx"> case 'HEAD':
</span></span></pre></div>
<a id="trunkwpincludesclassoembedphp"></a>
<div class="modfile"><h4>Modified: trunk/wp-includes/class-oembed.php (24479 => 24480)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/wp-includes/class-oembed.php 2013-06-21 06:02:58 UTC (rev 24479)
+++ trunk/wp-includes/class-oembed.php 2013-06-21 06:07:47 UTC (rev 24480)
</span><span class="lines">@@ -113,7 +113,7 @@
</span><span class="cx"> $providers = array();
</span><span class="cx">
</span><span class="cx"> // Fetch URL content
</span><del>- if ( $html = wp_remote_retrieve_body( wp_remote_get( $url ) ) ) {
</del><ins>+ if ( $html = wp_remote_retrieve_body( wp_remote_get( $url, array( 'reject_unsafe_urls' => true ) ) ) ) {
</ins><span class="cx">
</span><span class="cx"> // <link> types that contain oEmbed provider URLs
</span><span class="cx"> $linktypes = apply_filters( 'oembed_linktypes', array(
</span><span class="lines">@@ -195,7 +195,7 @@
</span><span class="cx"> */
</span><span class="cx"> function _fetch_with_format( $provider_url_with_args, $format ) {
</span><span class="cx"> $provider_url_with_args = add_query_arg( 'format', $format, $provider_url_with_args );
</span><del>- $response = wp_remote_get( $provider_url_with_args );
</del><ins>+ $response = wp_remote_get( $provider_url_with_args, array( 'reject_unsafe_urls' => true ) );
</ins><span class="cx"> if ( 501 == wp_remote_retrieve_response_code( $response ) )
</span><span class="cx"> return new WP_Error( 'not-implemented' );
</span><span class="cx"> if ( ! $body = wp_remote_retrieve_body( $response ) )
</span></span></pre></div>
<a id="trunkwpincludesclasswpxmlrpcserverphp"></a>
<div class="modfile"><h4>Modified: trunk/wp-includes/class-wp-xmlrpc-server.php (24479 => 24480)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/wp-includes/class-wp-xmlrpc-server.php 2013-06-21 06:02:58 UTC (rev 24479)
+++ trunk/wp-includes/class-wp-xmlrpc-server.php 2013-06-21 06:07:47 UTC (rev 24480)
</span><span class="lines">@@ -5396,7 +5396,8 @@
</span><span class="cx"> sleep(1);
</span><span class="cx">
</span><span class="cx"> // Let's check the remote site
</span><del>- $linea = wp_remote_retrieve_body( wp_remote_get( $pagelinkedfrom, array( 'timeout' => 10, 'redirection' => 0 ) ) );
</del><ins>+ $linea = wp_remote_retrieve_body( wp_remote_get( $pagelinkedfrom, array( 'timeout' => 10, 'redirection' => 0, 'reject_unsafe_urls' => true ) ) );
+
</ins><span class="cx"> if ( !$linea )
</span><span class="cx"> return $this->pingback_error( 16, __( 'The source URL does not exist.' ) );
</span><span class="cx">
</span></span></pre></div>
<a id="trunkwpincludescommentphp"></a>
<div class="modfile"><h4>Modified: trunk/wp-includes/comment.php (24479 => 24480)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/wp-includes/comment.php 2013-06-21 06:02:58 UTC (rev 24479)
+++ trunk/wp-includes/comment.php 2013-06-21 06:07:47 UTC (rev 24480)
</span><span class="lines">@@ -1658,7 +1658,7 @@
</span><span class="cx"> if ( 0 === strpos($url, $uploads_dir['baseurl']) )
</span><span class="cx"> return false;
</span><span class="cx">
</span><del>- $response = wp_remote_head( $url, array( 'timeout' => 2, 'httpversion' => '1.0' ) );
</del><ins>+ $response = wp_remote_head( $url, array( 'timeout' => 2, 'httpversion' => '1.0', 'reject_unsafe_urls' => true ) );
</ins><span class="cx">
</span><span class="cx"> if ( is_wp_error( $response ) )
</span><span class="cx"> return false;
</span><span class="lines">@@ -1671,7 +1671,7 @@
</span><span class="cx"> return false;
</span><span class="cx">
</span><span class="cx"> // Now do a GET since we're going to look in the html headers (and we're sure it's not a binary file)
</span><del>- $response = wp_remote_get( $url, array( 'timeout' => 2, 'httpversion' => '1.0' ) );
</del><ins>+ $response = wp_remote_get( $url, array( 'timeout' => 2, 'httpversion' => '1.0', 'reject_unsafe_urls' => true ) );
</ins><span class="cx">
</span><span class="cx"> if ( is_wp_error( $response ) )
</span><span class="cx"> return false;
</span><span class="lines">@@ -1906,6 +1906,7 @@
</span><span class="cx">
</span><span class="cx"> $options = array();
</span><span class="cx"> $options['timeout'] = 4;
</span><ins>+ $options['reject_unsafe_urls'] = true;
</ins><span class="cx"> $options['body'] = array(
</span><span class="cx"> 'title' => $title,
</span><span class="cx"> 'url' => get_permalink($ID),
</span><span class="lines">@@ -1953,62 +1954,13 @@
</span><span class="cx"> * Default filter attached to pingback_ping_source_uri to validate the pingback's Source URI
</span><span class="cx"> *
</span><span class="cx"> * @since 3.5.1
</span><ins>+ * @see wp_http_validate_url()
</ins><span class="cx"> *
</span><span class="cx"> * @param string $source_uri
</span><span class="cx"> * @return string
</span><span class="cx"> */
</span><span class="cx"> function pingback_ping_source_uri( $source_uri ) {
</span><del>- $uri = esc_url_raw( $source_uri, array( 'http', 'https' ) );
- if ( ! $uri )
- return '';
-
- $parsed_url = @parse_url( $uri );
- if ( ! $parsed_url )
- return '';
-
- if ( isset( $parsed_url['user'] ) || isset( $parsed_url['pass'] ) )
- return '';
-
- if ( false !== strpos( $parsed_url['host'], ':' ) )
- return '';
-
- $parsed_home = @parse_url( get_option( 'home' ) );
-
- $same_host = strtolower( $parsed_home['host'] ) === strtolower( $parsed_url['host'] );
-
- if ( ! $same_host ) {
- $host = trim( $parsed_url['host'], '.' );
- if ( preg_match( '#^\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}$#', $host ) ) {
- $ip = $host;
- } else {
- $ip = gethostbyname( $host );
- if ( $ip === $host ) // Error condition for gethostbyname()
- $ip = false;
- }
- if ( $ip ) {
- if ( '127.0.0.1' === $ip )
- return '';
- $parts = array_map( 'intval', explode( '.', $ip ) );
- if ( 10 === $parts[0] )
- return '';
- if ( 172 === $parts[0] && 16 <= $parts[1] && 31 >= $parts[1] )
- return '';
- if ( 192 === $parts[0] && 168 === $parts[1] )
- return '';
- }
- }
-
- if ( empty( $parsed_url['port'] ) )
- return $uri;
-
- $port = $parsed_url['port'];
- if ( 80 === $port || 443 === $port || 8080 === $port )
- return $uri;
-
- if ( $parsed_home && $same_host && $parsed_home['port'] === $port )
- return $uri;
-
- return '';
</del><ins>+ return (string) wp_http_validate_url( $source_uri );
</ins><span class="cx"> }
</span><span class="cx">
</span><span class="cx"> /**
</span></span></pre></div>
<a id="trunkwpincludesfunctionsphp"></a>
<div class="modfile"><h4>Modified: trunk/wp-includes/functions.php (24479 => 24480)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/wp-includes/functions.php 2013-06-21 06:02:58 UTC (rev 24479)
+++ trunk/wp-includes/functions.php 2013-06-21 06:07:47 UTC (rev 24480)
</span><span class="lines">@@ -496,6 +496,7 @@
</span><span class="cx">
</span><span class="cx"> $options = array();
</span><span class="cx"> $options['redirection'] = 5;
</span><ins>+ $options['reject_unsafe_urls'] = true;
</ins><span class="cx">
</span><span class="cx"> if ( false == $file_path )
</span><span class="cx"> $options['method'] = 'HEAD';
</span><span class="lines">@@ -543,7 +544,7 @@
</span><span class="cx"> if ( !empty( $deprecated ) )
</span><span class="cx"> _deprecated_argument( __FUNCTION__, '2.7' );
</span><span class="cx">
</span><del>- $response = wp_remote_head( $url );
</del><ins>+ $response = wp_remote_head( $url, array( 'reject_unsafe_urls' => true ) );
</ins><span class="cx">
</span><span class="cx"> if ( is_wp_error( $response ) )
</span><span class="cx"> return false;
</span><span class="lines">@@ -758,6 +759,7 @@
</span><span class="cx">
</span><span class="cx"> $options = array();
</span><span class="cx"> $options['timeout'] = 10;
</span><ins>+ $options['reject_unsafe_urls'] = true;
</ins><span class="cx">
</span><span class="cx"> $response = wp_remote_get( $uri, $options );
</span><span class="cx">
</span></span></pre></div>
<a id="trunkwpincludeshttpphp"></a>
<div class="modfile"><h4>Modified: trunk/wp-includes/http.php (24479 => 24480)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/wp-includes/http.php 2013-06-21 06:02:58 UTC (rev 24479)
+++ trunk/wp-includes/http.php 2013-06-21 06:07:47 UTC (rev 24480)
</span><span class="lines">@@ -330,3 +330,64 @@
</span><span class="cx">
</span><span class="cx"> return false;
</span><span class="cx"> }
</span><ins>+
+/**
+ * Validate a URL for safe use in the HTTP API.
+ *
+ * @since 3.5.2
+ *
+ * @return mixed URL or false on failure.
+ */
+function wp_http_validate_url( $url ) {
+ $url = esc_url_raw( $url, array( 'http', 'https' ) );
+ if ( ! $url )
+ return false;
+
+ $parsed_url = @parse_url( $url );
+ if ( ! $parsed_url )
+ return false;
+
+ if ( isset( $parsed_url['user'] ) || isset( $parsed_url['pass'] ) )
+ return false;
+
+ if ( false !== strpos( $parsed_url['host'], ':' ) )
+ return false;
+
+ $parsed_home = @parse_url( get_option( 'home' ) );
+
+ $same_host = strtolower( $parsed_home['host'] ) === strtolower( $parsed_url['host'] );
+
+ if ( ! $same_host ) {
+ $host = trim( $parsed_url['host'], '.' );
+ if ( preg_match( '#^\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}$#', $host ) ) {
+ $ip = $host;
+ } else {
+ $ip = gethostbyname( $host );
+ if ( $ip === $host ) // Error condition for gethostbyname()
+ $ip = false;
+ }
+ if ( $ip ) {
+ if ( '127.0.0.1' === $ip )
+ return false;
+ $parts = array_map( 'intval', explode( '.', $ip ) );
+ if ( 10 === $parts[0] )
+ return false;
+ if ( 172 === $parts[0] && 16 <= $parts[1] && 31 >= $parts[1] )
+ return false;
+ if ( 192 === $parts[0] && 168 === $parts[1] )
+ return false;
+ }
+ }
+
+ if ( empty( $parsed_url['port'] ) )
+ return $url;
+
+ $port = $parsed_url['port'];
+ if ( 80 === $port || 443 === $port || 8080 === $port )
+ return $url;
+
+ if ( $parsed_home && $same_host && $parsed_home['port'] === $port )
+ return $url;
+
+ return false;
+}
</ins></span></pre></div>
<a id="trunkwpincludesrssphp"></a>
<div class="modfile"><h4>Modified: trunk/wp-includes/rss.php (24479 => 24480)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/wp-includes/rss.php 2013-06-21 06:02:58 UTC (rev 24479)
+++ trunk/wp-includes/rss.php 2013-06-21 06:07:47 UTC (rev 24480)
</span><span class="lines">@@ -536,7 +536,7 @@
</span><span class="cx"> * @return Snoopy style response
</span><span class="cx"> */
</span><span class="cx"> function _fetch_remote_file($url, $headers = "" ) {
</span><del>- $resp = wp_remote_request($url, array('headers' => $headers, 'timeout' => MAGPIE_FETCH_TIME_OUT));
</del><ins>+ $resp = wp_remote_request($url, array('headers' => $headers, 'timeout' => MAGPIE_FETCH_TIME_OUT, 'reject_unsafe_urls' => true ));
</ins><span class="cx"> if ( is_wp_error($resp) ) {
</span><span class="cx"> $error = array_shift($resp->errors);
</span><span class="cx">
</span></span></pre>
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