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<title>[47633] trunk: Customize: Add additional filters to Customizer to prevent JSON corruption.</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/47633">47633</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/47633","name":"Review Commit"}}</script></dd>
<dt style="float: left; width: 6em; font-weight: bold">Author</dt> <dd>whyisjake</dd>
<dt style="float: left; width: 6em; font-weight: bold">Date</dt> <dd>2020-04-29 15:12:50 +0000 (Wed, 29 Apr 2020)</dd>
</dl>
<pre style='padding-left: 1em; margin: 2em 0; border-left: 2px solid #ccc; line-height: 1.25; font-size: 105%; font-family: sans-serif'>Customize: Add additional filters to Customizer to prevent JSON corruption.
This solution extends the wp_insert_post_data filter to pass in addition to the slashed/sanitized/processed data, and the slashed/sanitized/unprocessed data, to also pass the initial slashed/unsanitized/unprocessed data which was passed into wp_insert_post(). This then allows plugins to have complete control over how sanitization is performed based on the post type.
Props westonruter, peterwilsoncc, sstoqnov, whyisjake, xknown.
</pre>
<h3>Modified Paths</h3>
<ul>
<li><a href="#trunksrcwpincludesclasswpcustomizemanagerphp">trunk/src/wp-includes/class-wp-customize-manager.php</a></li>
<li><a href="#trunksrcwpincludespostphp">trunk/src/wp-includes/post.php</a></li>
<li><a href="#trunktestsphpunittestscustomizemanagerphp">trunk/tests/phpunit/tests/customize/manager.php</a></li>
</ul>
</div>
<div id="patch">
<h3>Diff</h3>
<a id="trunksrcwpincludesclasswpcustomizemanagerphp"></a>
<div class="modfile"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Modified: trunk/src/wp-includes/class-wp-customize-manager.php</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- trunk/src/wp-includes/class-wp-customize-manager.php 2020-04-29 14:41:42 UTC (rev 47632)
+++ trunk/src/wp-includes/class-wp-customize-manager.php 2020-04-29 15:12:50 UTC (rev 47633)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -2928,17 +2928,12 @@
</span><span class="cx" style="display: block; padding: 0 10px"> * WP_Customize_Setting::save().
</span><span class="cx" style="display: block; padding: 0 10px"> */
</span><span class="cx" style="display: block; padding: 0 10px">
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">- // Prevent content filters from corrupting JSON in post_content.
- $has_kses = ( false !== has_filter( 'content_save_pre', 'wp_filter_post_kses' ) );
- if ( $has_kses ) {
- kses_remove_filters();
- }
- $has_targeted_link_rel_filters = ( false !== has_filter( 'content_save_pre', 'wp_targeted_link_rel' ) );
- if ( $has_targeted_link_rel_filters ) {
- wp_remove_targeted_link_rel_filters();
- }
-
- // Note that updating a post with publish status will trigger WP_Customize_Manager::publish_changeset_values().
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ /*
+ * Update the changeset post. The publish_customize_changeset action will cause the settings in the
+ * changeset to be saved via WP_Customize_Setting::save(). Updating a post with publish status will
+ * trigger WP_Customize_Manager::publish_changeset_values().
+ */
+ add_filter( 'wp_insert_post_data', array( $this, 'preserve_insert_changeset_post_content' ), 5, 3 );
</ins><span class="cx" style="display: block; padding: 0 10px"> if ( $changeset_post_id ) {
</span><span class="cx" style="display: block; padding: 0 10px"> if ( $args['autosave'] && 'auto-draft' !== get_post_status( $changeset_post_id ) ) {
</span><span class="cx" style="display: block; padding: 0 10px"> // See _wp_translate_postdata() for why this is required as it will use the edit_post meta capability.
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -2969,15 +2964,8 @@
</span><span class="cx" style="display: block; padding: 0 10px"> $this->_changeset_post_id = $r; // Update cached post ID for the loaded changeset.
</span><span class="cx" style="display: block; padding: 0 10px"> }
</span><span class="cx" style="display: block; padding: 0 10px"> }
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ remove_filter( 'wp_insert_post_data', array( $this, 'preserve_insert_changeset_post_content' ), 5 );
</ins><span class="cx" style="display: block; padding: 0 10px">
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">- // Restore removed content filters.
- if ( $has_kses ) {
- kses_init_filters();
- }
- if ( $has_targeted_link_rel_filters ) {
- wp_init_targeted_link_rel_filters();
- }
-
</del><span class="cx" style="display: block; padding: 0 10px"> $this->_changeset_data = null; // Reset so WP_Customize_Manager::changeset_data() will re-populate with updated contents.
</span><span class="cx" style="display: block; padding: 0 10px">
</span><span class="cx" style="display: block; padding: 0 10px"> remove_filter( 'wp_save_post_revision_post_has_changed', array( $this, '_filter_revision_post_has_changed' ) );
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -2995,6 +2983,51 @@
</span><span class="cx" style="display: block; padding: 0 10px"> }
</span><span class="cx" style="display: block; padding: 0 10px">
</span><span class="cx" style="display: block; padding: 0 10px"> /**
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ * Preserve the initial JSON post_content passed to save into the post.
+ *
+ * This is needed to prevent KSES and other {@see 'content_save_pre'} filters
+ * from corrupting JSON data.
+ *
+ * Note that WP_Customize_Manager::validate_setting_values() have already
+ * run on the setting values being serialized as JSON into the post content
+ * so it is pre-sanitized.
+ *
+ * Also, the sanitization logic is re-run through the respective
+ * WP_Customize_Setting::sanitize() method when being read out of the
+ * changeset, via WP_Customize_Manager::post_value(), and this sanitized
+ * value will also be sent into WP_Customize_Setting::update() for
+ * persisting to the DB.
+ *
+ * Multiple users can collaborate on a single changeset, where one user may
+ * have the unfiltered_html capability but another may not. A user with
+ * unfiltered_html may add a script tag to some field which needs to be kept
+ * intact even when another user updates the changeset to modify another field
+ * when they do not have unfiltered_html.
+ *
+ * @since 5.4.1
+ *
+ * @param array $data An array of slashed and processed post data.
+ * @param array $postarr An array of sanitized (and slashed) but otherwise unmodified post data.
+ * @param array $unsanitized_postarr An array of slashed yet *unsanitized* and unprocessed post data as originally passed to wp_insert_post().
+ * @return array Filtered post data.
+ */
+ public function preserve_insert_changeset_post_content( $data, $postarr, $unsanitized_postarr ) {
+ if (
+ isset( $data['post_type'] ) &&
+ isset( $unsanitized_postarr['post_content'] ) &&
+ 'customize_changeset' === $data['post_type'] ||
+ (
+ 'revision' === $data['post_type'] &&
+ ! empty( $data['post_parent'] ) &&
+ 'customize_changeset' === get_post_type( $data['post_parent'] )
+ )
+ ) {
+ $data['post_content'] = $unsanitized_postarr['post_content'];
+ }
+ return $data;
+ }
+
+ /**
</ins><span class="cx" style="display: block; padding: 0 10px"> * Trash or delete a changeset post.
</span><span class="cx" style="display: block; padding: 0 10px"> *
</span><span class="cx" style="display: block; padding: 0 10px"> * The following re-formulates the logic from `wp_trash_post()` as done in
</span></span></pre></div>
<a id="trunksrcwpincludespostphp"></a>
<div class="modfile"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Modified: trunk/src/wp-includes/post.php</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- trunk/src/wp-includes/post.php 2020-04-29 14:41:42 UTC (rev 47632)
+++ trunk/src/wp-includes/post.php 2020-04-29 15:12:50 UTC (rev 47633)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -3594,6 +3594,9 @@
</span><span class="cx" style="display: block; padding: 0 10px"> function wp_insert_post( $postarr, $wp_error = false ) {
</span><span class="cx" style="display: block; padding: 0 10px"> global $wpdb;
</span><span class="cx" style="display: block; padding: 0 10px">
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ // Capture original pre-sanitized array for passing into filters.
+ $unsanitized_postarr = $postarr;
+
</ins><span class="cx" style="display: block; padding: 0 10px"> $user_id = get_current_user_id();
</span><span class="cx" style="display: block; padding: 0 10px">
</span><span class="cx" style="display: block; padding: 0 10px"> $defaults = array(
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -3918,21 +3921,27 @@
</span><span class="cx" style="display: block; padding: 0 10px"> * Filters attachment post data before it is updated in or added to the database.
</span><span class="cx" style="display: block; padding: 0 10px"> *
</span><span class="cx" style="display: block; padding: 0 10px"> * @since 3.9.0
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ * @since 5.4.1 `$unsanitized_postarr` argument added.
</ins><span class="cx" style="display: block; padding: 0 10px"> *
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">- * @param array $data An array of sanitized attachment post data.
- * @param array $postarr An array of unsanitized attachment post data.
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ * @param array $data An array of slashed, sanitized, and processed attachment post data.
+ * @param array $postarr An array of slashed and sanitized attachment post data, but not processed.
+ * @param array $unsanitized_postarr An array of slashed yet *unsanitized* and unprocessed attachment post data
+ * as originally passed to wp_insert_post().
</ins><span class="cx" style="display: block; padding: 0 10px"> */
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">- $data = apply_filters( 'wp_insert_attachment_data', $data, $postarr );
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ $data = apply_filters( 'wp_insert_attachment_data', $data, $postarr, $unsanitized_postarr );
</ins><span class="cx" style="display: block; padding: 0 10px"> } else {
</span><span class="cx" style="display: block; padding: 0 10px"> /**
</span><span class="cx" style="display: block; padding: 0 10px"> * Filters slashed post data just before it is inserted into the database.
</span><span class="cx" style="display: block; padding: 0 10px"> *
</span><span class="cx" style="display: block; padding: 0 10px"> * @since 2.7.0
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ * @since 5.4.1 `$unsanitized_postarr` argument added.
</ins><span class="cx" style="display: block; padding: 0 10px"> *
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">- * @param array $data An array of slashed post data.
- * @param array $postarr An array of sanitized, but otherwise unmodified post data.
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ * @param array $data An array of slashed, sanitized, and processed post data.
+ * @param array $postarr An array of sanitized (and slashed) but otherwise unmodified post data.
+ * @param array $unsanitized_postarr An array of slashed yet *unsanitized* and unprocessed post data as
+ * originally passed to wp_insert_post().
</ins><span class="cx" style="display: block; padding: 0 10px"> */
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">- $data = apply_filters( 'wp_insert_post_data', $data, $postarr );
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ $data = apply_filters( 'wp_insert_post_data', $data, $postarr, $unsanitized_postarr );
</ins><span class="cx" style="display: block; padding: 0 10px"> }
</span><span class="cx" style="display: block; padding: 0 10px"> $data = wp_unslash( $data );
</span><span class="cx" style="display: block; padding: 0 10px"> $where = array( 'ID' => $post_ID );
</span></span></pre></div>
<a id="trunktestsphpunittestscustomizemanagerphp"></a>
<div class="modfile"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Modified: trunk/tests/phpunit/tests/customize/manager.php</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- trunk/tests/phpunit/tests/customize/manager.php 2020-04-29 14:41:42 UTC (rev 47632)
+++ trunk/tests/phpunit/tests/customize/manager.php 2020-04-29 15:12:50 UTC (rev 47633)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -1241,6 +1241,171 @@
</span><span class="cx" style="display: block; padding: 0 10px"> }
</span><span class="cx" style="display: block; padding: 0 10px">
</span><span class="cx" style="display: block; padding: 0 10px"> /**
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ * Test saving changeset post without Kses or other content_save_pre filters mutating content.
+ *
+ * @covers WP_Customize_Manager::save_changeset_post()
+ */
+ public function test_save_changeset_post_without_kses_corrupting_json() {
+ global $wp_customize;
+ $lesser_admin_user_id = self::factory()->user->create( array( 'role' => 'administrator' ) );
+
+ $uuid = wp_generate_uuid4();
+ $wp_customize = new WP_Customize_Manager(
+ array(
+ 'changeset_uuid' => $uuid,
+ )
+ );
+
+ add_filter( 'map_meta_cap', array( $this, 'filter_map_meta_cap_to_disallow_unfiltered_html' ), 10, 2 );
+ kses_init();
+ add_filter( 'content_save_pre', 'capital_P_dangit' );
+ add_post_type_support( 'customize_changeset', 'revisions' );
+
+ $options = array(
+ 'custom_html_1' => '<script>document.write(" Wordpress 1")</script>',
+ 'custom_html_2' => '<script>document.write(" Wordpress 2")</script>',
+ 'custom_html_3' => '<script>document.write(" Wordpress 3")</script>',
+ );
+
+ // Populate setting as user who can bypass content_save_pre filter.
+ wp_set_current_user( self::$admin_user_id );
+ $wp_customize = $this->get_manager_for_testing_json_corruption_protection( $uuid );
+ $wp_customize->set_post_value( 'custom_html_1', $options['custom_html_1'] );
+ $wp_customize->save_changeset_post(
+ array(
+ 'status' => 'draft',
+ )
+ );
+
+ // Populate setting as user who cannot bypass content_save_pre filter.
+ wp_set_current_user( $lesser_admin_user_id );
+ $wp_customize = $this->get_manager_for_testing_json_corruption_protection( $uuid );
+ $wp_customize->set_post_value( 'custom_html_2', $options['custom_html_2'] );
+ $wp_customize->save_changeset_post(
+ array(
+ 'autosave' => true,
+ )
+ );
+
+ /*
+ * Ensure that the unsanitized value (the "POST data") is preserved in the autosave revision.
+ * The value is sent through the sanitize function when it is read from the changeset.
+ */
+ $autosave_revision = wp_get_post_autosave( $wp_customize->changeset_post_id(), get_current_user_id() );
+ $saved_data = json_decode( $autosave_revision->post_content, true );
+ $this->assertEquals( $options['custom_html_1'], $saved_data['custom_html_1']['value'] );
+ $this->assertEquals( $options['custom_html_2'], $saved_data['custom_html_2']['value'] );
+
+ // Update post to discard autosave.
+ $wp_customize->save_changeset_post(
+ array(
+ 'status' => 'draft',
+ )
+ );
+
+ /*
+ * Ensure that the unsanitized value (the "POST data") is preserved in the post content.
+ * The value is sent through the sanitize function when it is read from the changeset.
+ */
+ $wp_customize = $this->get_manager_for_testing_json_corruption_protection( $uuid );
+ $saved_data = json_decode( get_post( $wp_customize->changeset_post_id() )->post_content, true );
+ $this->assertEquals( $options['custom_html_1'], $saved_data['custom_html_1']['value'] );
+ $this->assertEquals( $options['custom_html_2'], $saved_data['custom_html_2']['value'] );
+
+ /*
+ * Ensure that the unsanitized value (the "POST data") is preserved in the revisions' content.
+ * The value is sent through the sanitize function when it is read from the changeset.
+ */
+ $revisions = wp_get_post_revisions( $wp_customize->changeset_post_id() );
+ $revision = array_shift( $revisions );
+ $saved_data = json_decode( $revision->post_content, true );
+ $this->assertEquals( $options['custom_html_1'], $saved_data['custom_html_1']['value'] );
+ $this->assertEquals( $options['custom_html_2'], $saved_data['custom_html_2']['value'] );
+
+ /*
+ * Now when publishing the changeset, the unsanitized values will be read from the changeset
+ * and sanitized according to the capabilities of the users who originally updated each
+ * setting in the changeset to begin with.
+ */
+ wp_set_current_user( $lesser_admin_user_id );
+ $wp_customize = $this->get_manager_for_testing_json_corruption_protection( $uuid );
+ $wp_customize->set_post_value( 'custom_html_3', $options['custom_html_3'] );
+ $wp_customize->save_changeset_post(
+ array(
+ 'status' => 'publish',
+ )
+ );
+
+ // User saved as one who can bypass content_save_pre filter.
+ $this->assertContains( '<script>', get_option( 'custom_html_1' ) );
+ $this->assertContains( 'Wordpress', get_option( 'custom_html_1' ) ); // phpcs:ignore WordPress.WP.CapitalPDangit.Misspelled
+
+ // User saved as one who cannot bypass content_save_pre filter.
+ $this->assertNotContains( '<script>', get_option( 'custom_html_2' ) );
+ $this->assertContains( 'WordPress', get_option( 'custom_html_2' ) );
+
+ // User saved as one who also cannot bypass content_save_pre filter.
+ $this->assertNotContains( '<script>', get_option( 'custom_html_3' ) );
+ $this->assertContains( 'WordPress', get_option( 'custom_html_3' ) );
+ }
+
+ /**
+ * Get a manager for testing JSON corruption protection.
+ *
+ * @param string $uuid UUID.
+ * @return WP_Customize_Manager Manager.
+ */
+ private function get_manager_for_testing_json_corruption_protection( $uuid ) {
+ global $wp_customize;
+ $wp_customize = new WP_Customize_Manager(
+ array(
+ 'changeset_uuid' => $uuid,
+ )
+ );
+ for ( $i = 0; $i < 5; $i++ ) {
+ $wp_customize->add_setting(
+ sprintf( 'custom_html_%d', $i ),
+ array(
+ 'type' => 'option',
+ 'sanitize_callback' => array( $this, 'apply_content_save_pre_filters_if_not_main_admin_user' ),
+ )
+ );
+ }
+ return $wp_customize;
+ }
+
+ /**
+ * Sanitize content with Kses if the current user is not the main admin.
+ *
+ * @since 5.2.?
+ *
+ * @param string $content Content to sanitize.
+ * @return string Sanitized content.
+ */
+ public function apply_content_save_pre_filters_if_not_main_admin_user( $content ) {
+ if ( get_current_user_id() !== self::$admin_user_id ) {
+ $content = apply_filters( 'content_save_pre', $content );
+ }
+ return $content;
+ }
+
+ /**
+ * Filter map_meta_cap to disallow unfiltered_html.
+ *
+ * @since 5.2.?
+ *
+ * @param array $caps User's capabilities.
+ * @param string $cap Requested cap.
+ * @return array Caps.
+ */
+ public function filter_map_meta_cap_to_disallow_unfiltered_html( $caps, $cap ) {
+ if ( 'unfiltered_html' === $cap ) {
+ $caps = array( 'do_not_allow' );
+ }
+ return $caps;
+ }
+
+ /**
</ins><span class="cx" style="display: block; padding: 0 10px"> * Call count for customize_changeset_save_data filter.
</span><span class="cx" style="display: block; padding: 0 10px"> *
</span><span class="cx" style="display: block; padding: 0 10px"> * @var int
</span></span></pre>
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