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<title>[54100] trunk: KSES: Allow `min()`, `max()`, `minmax()`, and `clamp()` values to be used in inline CSS.</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/54100">54100</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/54100","name":"Review Commit"}}</script></dd>
<dt style="float: left; width: 6em; font-weight: bold">Author</dt> <dd>SergeyBiryukov</dd>
<dt style="float: left; width: 6em; font-weight: bold">Date</dt> <dd>2022-09-08 13:24:10 +0000 (Thu, 08 Sep 2022)</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'>KSES: Allow `min()`, `max()`, `minmax()`, and `clamp()` values to be used in inline CSS.
Additionally, this commit updates `safecss_filter_attr()` to add support for nested `var()` functions, so that a fallback value can be another CSS variable.
Follow-up to <a href="https://core.trac.wordpress.org/changeset/50923">[50923]</a>.
Props johnregan3, noisysocks, cbravobernal, uxl, isabel_brison, andrewserong, ramonopoly, joyously, bernhard-reiter, peterwilsoncc.
Fixes <a href="https://core.trac.wordpress.org/ticket/55966">#55966</a>.</pre>
<h3>Modified Paths</h3>
<ul>
<li><a href="#trunksrcwpincludesksesphp">trunk/src/wp-includes/kses.php</a></li>
<li><a href="#trunktestsphpunittestsksesphp">trunk/tests/phpunit/tests/kses.php</a></li>
<li><a href="#trunktestsphpunitteststhemewpThemeJsonphp">trunk/tests/phpunit/tests/theme/wpThemeJson.php</a></li>
</ul>
</div>
<div id="patch">
<h3>Diff</h3>
<a id="trunksrcwpincludesksesphp"></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/kses.php</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- trunk/src/wp-includes/kses.php 2022-09-08 10:15:15 UTC (rev 54099)
+++ trunk/src/wp-includes/kses.php 2022-09-08 13:24:10 UTC (rev 54100)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -2228,6 +2228,8 @@
</span><span class="cx" style="display: block; padding: 0 10px"> * @since 5.3.1 Added support for gradient backgrounds.
</span><span class="cx" style="display: block; padding: 0 10px"> * @since 5.7.1 Added support for `object-position`.
</span><span class="cx" style="display: block; padding: 0 10px"> * @since 5.8.0 Added support for `calc()` and `var()` values.
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ * @since 6.1.0 Added support for `min()`, `max()`, `minmax()`, `clamp()`,
+ * and nested `var()` values.
</ins><span class="cx" style="display: block; padding: 0 10px"> *
</span><span class="cx" style="display: block; padding: 0 10px"> * @param string $css A string of CSS rules.
</span><span class="cx" style="display: block; padding: 0 10px"> * @param string $deprecated Not used.
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -2467,13 +2469,20 @@
</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"> if ( $found ) {
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">- // Allow CSS calc().
- $css_test_string = preg_replace( '/calc\(((?:\([^()]*\)?|[^()])*)\)/', '', $css_test_string );
- // Allow CSS var().
- $css_test_string = preg_replace( '/\(?var\(--[a-zA-Z0-9_-]*\)/', '', $css_test_string );
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ /*
+ * Allow CSS functions like var(), calc(), etc. by removing them from the test string.
+ * Nested functions and parentheses are also removed, so long as the parentheses are balanced.
+ */
+ $css_test_string = preg_replace(
+ '/\b(?:var|calc|min|max|minmax|clamp)(\((?:[^()]|(?1))*\))/',
+ '',
+ $css_test_string
+ );
</ins><span class="cx" style="display: block; padding: 0 10px">
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">- // Check for any CSS containing \ ( & } = or comments,
- // except for url(), calc(), or var() usage checked above.
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ /*
+ * Disallow CSS containing \ ( & } = or comments, except for within url(), var(), calc(), etc.
+ * which were removed from the test string above.
+ */
</ins><span class="cx" style="display: block; padding: 0 10px"> $allow_css = ! preg_match( '%[\\\(&=}]|/\*%', $css_test_string );
</span><span class="cx" style="display: block; padding: 0 10px">
</span><span class="cx" style="display: block; padding: 0 10px"> /**
</span></span></pre></div>
<a id="trunktestsphpunittestsksesphp"></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/kses.php</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- trunk/tests/phpunit/tests/kses.php 2022-09-08 10:15:15 UTC (rev 54099)
+++ trunk/tests/phpunit/tests/kses.php 2022-09-08 13:24:10 UTC (rev 54100)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -935,6 +935,7 @@
</span><span class="cx" style="display: block; padding: 0 10px"> * @ticket 37248
</span><span class="cx" style="display: block; padding: 0 10px"> * @ticket 42729
</span><span class="cx" style="display: block; padding: 0 10px"> * @ticket 48376
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ * @ticket 55966
</ins><span class="cx" style="display: block; padding: 0 10px"> * @dataProvider data_test_safecss_filter_attr
</span><span class="cx" style="display: block; padding: 0 10px"> *
</span><span class="cx" style="display: block; padding: 0 10px"> * @param string $css A string of CSS rules.
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -1120,6 +1121,121 @@
</span><span class="cx" style="display: block; padding: 0 10px"> 'css' => 'color: rgb( 100, 100, 100, .4 )',
</span><span class="cx" style="display: block; padding: 0 10px"> 'expected' => '',
</span><span class="cx" style="display: block; padding: 0 10px"> ),
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ // Allow min().
+ array(
+ 'css' => 'width: min(50%, 400px)',
+ 'expected' => 'width: min(50%, 400px)',
+ ),
+ // Allow max().
+ array(
+ 'css' => 'width: max(50%, 40rem)',
+ 'expected' => 'width: max(50%, 40rem)',
+ ),
+ // Allow minmax().
+ array(
+ 'css' => 'width: minmax(100px, 50%)',
+ 'expected' => 'width: minmax(100px, 50%)',
+ ),
+ // Allow clamp().
+ array(
+ 'css' => 'width: clamp(100px, 50%, 100vw)',
+ 'expected' => 'width: clamp(100px, 50%, 100vw)',
+ ),
+ // Allow two functions in the same CSS.
+ array(
+ 'css' => 'width: clamp(min(100px, 350px), 50%, 500px), 600px)',
+ 'expected' => 'width: clamp(min(100px, 350px), 50%, 500px), 600px)',
+ ),
+ // Allow gradient() function.
+ array(
+ 'css' => 'background: linear-gradient(90deg, rgba(2,0,36,1) 0%, rgba(9,9,121,1) 35%, rgba(0,212,255,1) 100%)',
+ 'expected' => 'background: linear-gradient(90deg, rgba(2,0,36,1) 0%, rgba(9,9,121,1) 35%, rgba(0,212,255,1) 100%)',
+ ),
+ // Combined CSS function names.
+ array(
+ 'css' => 'width: calcmax(100px + 50%)',
+ 'expected' => '',
+ ),
+ // Allow calc().
+ array(
+ 'css' => 'width: calc(2em + 3px)',
+ 'expected' => 'width: calc(2em + 3px)',
+ ),
+ // Allow calc() with nested brackets.
+ array(
+ 'css' => 'width: calc(3em + (10px * 2))',
+ 'expected' => 'width: calc(3em + (10px * 2))',
+ ),
+ // Allow var().
+ array(
+ 'css' => 'padding: var(--wp-var1) var(--wp-var2)',
+ 'expected' => 'padding: var(--wp-var1) var(--wp-var2)',
+ ),
+ // Allow var() with fallback (commas).
+ array(
+ 'css' => 'padding: var(--wp-var1, 10px)',
+ 'expected' => 'padding: var(--wp-var1, 10px)',
+ ),
+ // Allow var() with fallback (percentage).
+ array(
+ 'css' => 'padding: var(--wp-var1, 50%)',
+ 'expected' => 'padding: var(--wp-var1, 50%)',
+ ),
+ // Allow var() with fallback var().
+ array(
+ 'css' => 'background-color: var(--wp-var, var(--wp-var-fallback, pink))',
+ 'expected' => 'background-color: var(--wp-var, var(--wp-var-fallback, pink))',
+ ),
+ // Allow var() with square brackets.
+ array(
+ 'css' => 'background-color: var(--wp-var, [pink])',
+ 'expected' => 'background-color: var(--wp-var, [pink])',
+ ),
+ // Allow calc() with var().
+ array(
+ 'css' => 'margin-top: calc(var(--wp-var1) * 3 + 2em)',
+ 'expected' => 'margin-top: calc(var(--wp-var1) * 3 + 2em)',
+ ),
+ // Malformed min, no closing `)`.
+ array(
+ 'css' => 'width: min(3em + 10px',
+ 'expected' => '',
+ ),
+ // Malformed max, no closing `)`.
+ array(
+ 'css' => 'width: max(3em + 10px',
+ 'expected' => '',
+ ),
+ // Malformed minmax, no closing `)`.
+ array(
+ 'css' => 'width: minmax(3em + 10px',
+ 'expected' => '',
+ ),
+ // Malformed calc, no closing `)`.
+ array(
+ 'css' => 'width: calc(3em + 10px',
+ 'expected' => '',
+ ),
+ // Malformed var, no closing `)`.
+ array(
+ 'css' => 'width: var(--wp-var1',
+ 'expected' => '',
+ ),
+ // Malformed calc, mismatching brackets.
+ array(
+ 'css' => 'width: calc(3em + (10px * 2)',
+ 'expected' => '',
+ ),
+ // Malformed var, mismatching brackets.
+ array(
+ 'css' => 'background-color: var(--wp-var, var(--wp-var-fallback, pink)',
+ 'expected' => '',
+ ),
+ // Don't allow expressions outside of a calc().
+ array(
+ 'css' => 'width: (3em + (10px * 2))',
+ 'expected' => '',
+ ),
</ins><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><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -1301,24 +1417,6 @@
</span><span class="cx" style="display: block; padding: 0 10px"> 'background: red',
</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">- // CSS calc().
- array(
- 'width: calc(2em + 3px)',
- 'width: calc(2em + 3px)',
- ),
-
- // CSS variable.
- array(
- 'padding: var(--wp-var1) var(--wp-var2)',
- 'padding: var(--wp-var1) var(--wp-var2)',
- ),
-
- // CSS calc() with var().
- array(
- 'margin-top: calc(var(--wp-var1) * 3 + 2em)',
- 'margin-top: calc(var(--wp-var1) * 3 + 2em)',
- ),
-
</del><span class="cx" style="display: block; padding: 0 10px"> /*
</span><span class="cx" style="display: block; padding: 0 10px"> * Invalid use cases.
</span><span class="cx" style="display: block; padding: 0 10px"> */
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -1382,18 +1480,6 @@
</span><span class="cx" style="display: block; padding: 0 10px"> 'background-image: url( "http://example.com );',
</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">-
- // Malformed calc, no closing `)`.
- array(
- 'width: calc(3em + 10px',
- '',
- ),
-
- // Malformed var, no closing `)`.
- array(
- 'width: var(--wp-var1',
- '',
- ),
</del><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></span></pre></div>
<a id="trunktestsphpunitteststhemewpThemeJsonphp"></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/theme/wpThemeJson.php</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- trunk/tests/phpunit/tests/theme/wpThemeJson.php 2022-09-08 10:15:15 UTC (rev 54099)
+++ trunk/tests/phpunit/tests/theme/wpThemeJson.php 2022-09-08 13:24:10 UTC (rev 54100)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -1602,7 +1602,7 @@
</span><span class="cx" style="display: block; padding: 0 10px"> ),
</span><span class="cx" style="display: block; padding: 0 10px"> 'core/cover' => array(
</span><span class="cx" style="display: block; padding: 0 10px"> 'filter' => array(
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">- 'duotone' => 'var(--wp--preset--duotone--blue-red, var(--fallback-unsafe))',
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ 'duotone' => 'var(--invalid',
</ins><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"> 'core/group' => array(
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -1676,7 +1676,7 @@
</span><span class="cx" style="display: block; padding: 0 10px"> 'border' => array(
</span><span class="cx" style="display: block; padding: 0 10px"> 'radius' => array(
</span><span class="cx" style="display: block; padding: 0 10px"> 'topLeft' => '6px',
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">- 'topRight' => 'var(--top-right, var(--unsafe-fallback))',
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ 'topRight' => 'var(--invalid',
</ins><span class="cx" style="display: block; padding: 0 10px"> 'bottomRight' => '6px',
</span><span class="cx" style="display: block; padding: 0 10px"> 'bottomLeft' => '6px',
</span><span class="cx" style="display: block; padding: 0 10px"> ),
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -1685,7 +1685,7 @@
</span><span class="cx" style="display: block; padding: 0 10px"> 'padding' => array(
</span><span class="cx" style="display: block; padding: 0 10px"> 'top' => '1px',
</span><span class="cx" style="display: block; padding: 0 10px"> 'right' => '1px',
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">- 'bottom' => 'var(--bottom, var(--unsafe-fallback))',
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ 'bottom' => 'var(--invalid',
</ins><span class="cx" style="display: block; padding: 0 10px"> 'left' => '1px',
</span><span class="cx" style="display: block; padding: 0 10px"> ),
</span><span class="cx" style="display: block; padding: 0 10px"> ),
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -1695,7 +1695,7 @@
</span><span class="cx" style="display: block; padding: 0 10px"> 'padding' => array(
</span><span class="cx" style="display: block; padding: 0 10px"> 'top' => '2px',
</span><span class="cx" style="display: block; padding: 0 10px"> 'right' => '2px',
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">- 'bottom' => 'var(--bottom, var(--unsafe-fallback))',
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ 'bottom' => 'var(--invalid',
</ins><span class="cx" style="display: block; padding: 0 10px"> 'left' => '2px',
</span><span class="cx" style="display: block; padding: 0 10px"> ),
</span><span class="cx" style="display: block; padding: 0 10px"> ),
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -1706,7 +1706,7 @@
</span><span class="cx" style="display: block; padding: 0 10px"> 'border' => array(
</span><span class="cx" style="display: block; padding: 0 10px"> 'radius' => array(
</span><span class="cx" style="display: block; padding: 0 10px"> 'topLeft' => '5px',
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">- 'topRight' => 'var(--top-right, var(--unsafe-fallback))',
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ 'topRight' => 'var(--invalid',
</ins><span class="cx" style="display: block; padding: 0 10px"> 'bottomRight' => '5px',
</span><span class="cx" style="display: block; padding: 0 10px"> 'bottomLeft' => '5px',
</span><span class="cx" style="display: block; padding: 0 10px"> ),
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -1715,7 +1715,7 @@
</span><span class="cx" style="display: block; padding: 0 10px"> 'padding' => array(
</span><span class="cx" style="display: block; padding: 0 10px"> 'top' => '3px',
</span><span class="cx" style="display: block; padding: 0 10px"> 'right' => '3px',
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">- 'bottom' => 'var(bottom, var(--unsafe-fallback))',
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ 'bottom' => 'var(--invalid',
</ins><span class="cx" style="display: block; padding: 0 10px"> 'left' => '3px',
</span><span class="cx" style="display: block; padding: 0 10px"> ),
</span><span class="cx" style="display: block; padding: 0 10px"> ),
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -1725,7 +1725,7 @@
</span><span class="cx" style="display: block; padding: 0 10px"> 'padding' => array(
</span><span class="cx" style="display: block; padding: 0 10px"> 'top' => '4px',
</span><span class="cx" style="display: block; padding: 0 10px"> 'right' => '4px',
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">- 'bottom' => 'var(--bottom, var(--unsafe-fallback))',
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ 'bottom' => 'var(--invalid',
</ins><span class="cx" style="display: block; padding: 0 10px"> 'left' => '4px',
</span><span class="cx" style="display: block; padding: 0 10px"> ),
</span><span class="cx" style="display: block; padding: 0 10px"> ),
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -1944,7 +1944,7 @@
</span><span class="cx" style="display: block; padding: 0 10px"> array(
</span><span class="cx" style="display: block; padding: 0 10px"> 'name' => 'Blue',
</span><span class="cx" style="display: block; padding: 0 10px"> 'slug' => 'blue',
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">- 'color' => 'var(--color, var(--unsafe-fallback))',
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ 'color' => 'var(--invalid',
</ins><span class="cx" style="display: block; padding: 0 10px"> ),
</span><span class="cx" style="display: block; padding: 0 10px"> array(
</span><span class="cx" style="display: block; padding: 0 10px"> 'name' => 'Pink',
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -1975,7 +1975,7 @@
</span><span class="cx" style="display: block; padding: 0 10px"> array(
</span><span class="cx" style="display: block; padding: 0 10px"> 'name' => 'Helvetica Arial',
</span><span class="cx" style="display: block; padding: 0 10px"> 'slug' => 'helvetica-arial',
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">- 'fontFamily' => 'var(--fontFamily, var(--unsafe-fallback))',
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ 'fontFamily' => 'var(--invalid',
</ins><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><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -1998,7 +1998,7 @@
</span><span class="cx" style="display: block; padding: 0 10px"> array(
</span><span class="cx" style="display: block; padding: 0 10px"> 'name' => 'Blue',
</span><span class="cx" style="display: block; padding: 0 10px"> 'slug' => 'blue',
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">- 'color' => 'var(--color, var(--unsafe--fallback))',
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ 'color' => 'var(--invalid',
</ins><span class="cx" style="display: block; padding: 0 10px"> ),
</span><span class="cx" style="display: block; padding: 0 10px"> array(
</span><span class="cx" style="display: block; padding: 0 10px"> 'name' => 'Pink',
</span></span></pre>
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