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<title>[45356] branches/5.2/tests/phpunit/tests/file.php: Upgrade/Install: Don't run signature verify on slow 32-bit systems.</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/45356">45356</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/45356","name":"Review Commit"}}</script></dd>
<dt style="float: left; width: 6em; font-weight: bold">Author</dt> <dd>desrosj</dd>
<dt style="float: left; width: 6em; font-weight: bold">Date</dt> <dd>2019-05-17 17:48:23 +0000 (Fri, 17 May 2019)</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'>Upgrade/Install: Don't run signature verify on slow 32-bit systems.
The `sodium_compat` library can be very slow for certain operations on 32-bit architectures, which can lead to web server timeouts while attempting to verify an update. This adds a runtime speed check to skip signature verification on systems that would otherwise time out. Includes simple unit tests.
Merges <a href="https://core.trac.wordpress.org/changeset/45345">[45345]</a> to the 5.2 branch.
Props dd32, paragoninitiativeenterprises, tellyworth.
Fixes <a href="https://core.trac.wordpress.org/ticket/47186">#47186</a>.</pre>
<h3>Modified Paths</h3>
<ul>
<li><a href="#branches52srcwpadminincludesfilephp">branches/5.2/src/wp-admin/includes/file.php</a></li>
<li><a href="#branches52testsphpunittestsfilephp">branches/5.2/tests/phpunit/tests/file.php</a></li>
</ul>
<h3>Property Changed</h3>
<ul>
<li><a href="#branches52">branches/5.2/</a></li>
</ul>
</div>
<div id="patch">
<h3>Diff</h3>
<span class="cx" style="display: block; padding: 0 10px">Index: branches/5.2
</span><span class="cx" style="display: block; padding: 0 10px">===================================================================
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">--- branches/5.2 2019-05-17 17:19:21 UTC (rev 45355)
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+++ branches/5.2 2019-05-17 17:48:23 UTC (rev 45356)
</ins><a id="branches52"></a>
<div class="propset"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Property changes: branches/5.2</h4>
<pre class="diff"><span>
</span></pre></div>
<a id="svnmergeinfo"></a>
<div class="modfile"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Modified: svn:mergeinfo</h4></div>
<span class="cx" style="display: block; padding: 0 10px"> /branches/3.4:21757
</span><span class="cx" style="display: block; padding: 0 10px"> /branches/4.9:43557,43622
</span><span class="cx" style="display: block; padding: 0 10px"> /branches/5.0:43681-43682,43684-43688,43719-43720,43723,43726-43727,43729-43731,43734-43744,43747,43751-43754,43758,43760-43765,43767-43770,43772,43774-43781,43783,43785,43790-43806,43808-43821,43825,43828,43830-43834,43836-43843,43846-43863,43867-43889,43891-43894,43897-43905,43908-43909,43911-43929,43931-43942,43946-43947,43949-43956,43959-43964,43967-43969,43988,43994,44014,44017,44047,44183,44185,44187-44206,44208-44213,44231-44232,44235,44248,44284,44287-44288
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-/trunk:45285,45287,45289,45292,45296,45300-45301,45308-45311,45316,45319,45322,45324,45326,45328,45331,45334,45336,45338,45340,45342,45344,45346,45348,45350,45352
</del><span class="cx" style="display: block; padding: 0 10px">\ No newline at end of property
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+/trunk:45285,45287,45289,45292,45296,45300-45301,45308-45311,45316,45319,45322,45324,45326,45328,45331,45334,45336,45338,45340,45342,45344-45346,45348,45350,45352
</ins><span class="cx" style="display: block; padding: 0 10px">\ No newline at end of property
</span><a id="branches52srcwpadminincludesfilephp"></a>
<div class="modfile"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Modified: branches/5.2/src/wp-admin/includes/file.php</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- branches/5.2/src/wp-admin/includes/file.php 2019-05-17 17:19:21 UTC (rev 45355)
+++ branches/5.2/src/wp-admin/includes/file.php 2019-05-17 17:48:23 UTC (rev 45356)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -1199,6 +1199,39 @@
</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">+ // Verify runtime speed of Sodium_Compat is acceptable.
+ if ( ! extension_loaded( 'sodium' ) && ! ParagonIE_Sodium_Compat::polyfill_is_fast() ) {
+ $sodium_compat_is_fast = false;
+
+ // Allow for an old version of Sodium_Compat being loaded before the bundled WordPress one.
+ if ( method_exists( 'ParagonIE_Sodium_Compat', 'runtime_speed_test' ) ) {
+ // Run `ParagonIE_Sodium_Compat::runtime_speed_test()` in optimized integer mode, as that's what WordPress utilises during signing verifications.
+ $old_fastMult = ParagonIE_Sodium_Compat::$fastMult;
+ ParagonIE_Sodium_Compat::$fastMult = true;
+ $sodium_compat_is_fast = ParagonIE_Sodium_Compat::runtime_speed_test( 100, 10 );
+ ParagonIE_Sodium_Compat::$fastMult = $old_fastMult;
+ }
+
+ // This cannot be performed in a reasonable amount of time
+ // https://github.com/paragonie/sodium_compat#help-sodium_compat-is-slow-how-can-i-make-it-fast
+ if ( ! $sodium_compat_is_fast ) {
+ return new WP_Error(
+ 'signature_verification_unsupported',
+ sprintf(
+ /* translators: 1: The filename of the package. */
+ __( 'The authenticity of %1$s could not be verified as signature verification is unavailable on this system.' ),
+ '<span class="code">' . esc_html( $filename_for_errors ) . '</span>'
+ ),
+ array(
+ 'php' => phpversion(),
+ 'sodium' => defined( 'SODIUM_LIBRARY_VERSION' ) ? SODIUM_LIBRARY_VERSION : ( defined( 'ParagonIE_Sodium_Compat::VERSION_STRING' ) ? ParagonIE_Sodium_Compat::VERSION_STRING : false ),
+ 'polyfill_is_fast' => false,
+ 'max_execution_time' => ini_get( 'max_execution_time' ),
+ )
+ );
+ }
+ }
+
</ins><span class="cx" style="display: block; padding: 0 10px"> if ( ! $signatures ) {
</span><span class="cx" style="display: block; padding: 0 10px"> return new WP_Error(
</span><span class="cx" style="display: block; padding: 0 10px"> 'signature_verification_no_signature',
</span></span></pre></div>
<a id="branches52testsphpunittestsfilephp"></a>
<div class="modfile"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Modified: branches/5.2/tests/phpunit/tests/file.php</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- branches/5.2/tests/phpunit/tests/file.php 2019-05-17 17:19:21 UTC (rev 45355)
+++ branches/5.2/tests/phpunit/tests/file.php 2019-05-17 17:48:23 UTC (rev 45356)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -183,4 +183,63 @@
</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">+ /**
+ * @ticket 47186
+ */
+ function test_file_signature_functions_as_expected() {
+ $file = wp_tempnam();
+ file_put_contents( $file, 'WordPress' );
+
+ // The signature of 'WordPress' after SHA384 hashing, for verification against the key within self::filter_trust_plus85Tq_key().
+ $expected_signature = 'PmNv0b1ziwJAsVhjdpjd4+PQZidZWSlBm5b+GbbwE9m9HVKDFhEyvyRTHkRYOLypB8P2YvbW7CoOMZqGh8mEAA==';
+
+ add_filter( 'wp_trusted_keys', array( $this, 'filter_trust_plus85Tq_key' ) );
+
+ // Measure how long the call takes.
+ $timer_start = microtime( 1 );
+ $verify = verify_file_signature( $file, $expected_signature, 'WordPress' );
+ $timer_end = microtime( 1 );
+ $time_taken = ( $timer_end - $timer_start );
+
+ unlink( $file );
+ remove_filter( 'wp_trusted_keys', array( $this, 'filter_trust_plus85Tq_key' ) );
+
+ // verify_file_signature() should intentionally never take more than 10s to run.
+ $this->assertLessThan( 10, $time_taken, 'verify_file_signature() took longer than 10 seconds.' );
+
+ // Check to see if the system parameters prevent signature verifications.
+ if ( is_wp_error( $verify ) && 'signature_verification_unsupported' == $verify->get_error_code() ) {
+ $this->markTestSkipped( 'This system does not support Signature Verification.' );
+ }
+
+ $this->assertNotWPError( $verify );
+ $this->assertTrue( $verify );
+ }
+
+ /**
+ * @ticket 47186
+ */
+ function test_file_signature_expected_failure() {
+ $file = wp_tempnam();
+ file_put_contents( $file, 'WordPress' );
+
+ // Test an invalid signature.
+ $expected_signature = base64_encode( str_repeat( 'A', SODIUM_CRYPTO_SIGN_PUBLICKEYBYTES ) );
+ $verify = verify_file_signature( $file, $expected_signature, 'WordPress' );
+ unlink( $file );
+
+ if ( is_wp_error( $verify ) && 'signature_verification_unsupported' == $verify->get_error_code() ) {
+ $this->markTestSkipped( 'This system does not support Signature Verification.' );
+ }
+
+ $this->assertWPError( $verify );
+ $this->assertEquals( 'signature_verification_failed', $verify->get_error_code() );
+ }
+
+ function filter_trust_plus85Tq_key( $keys ) {
+ // A static once-off key used to verify verify_file_signature() works as expected.
+ $keys[] = '+85TqMhxQVAYVW4BSCVkJQvZH4q7z8I9lePbvngvf7A=';
+
+ return $keys;
+ }
</ins><span class="cx" style="display: block; padding: 0 10px"> }
</span></span></pre>
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