<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN"
"http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head><meta http-equiv="content-type" content="text/html; charset=utf-8" />
<title>[45345] trunk: Upgrade/Install: Don't run signature verify on slow 32-bit systems.</title>
</head>
<body>

<style type="text/css"><!--
#msg dl.meta { border: 1px #006 solid; background: #369; padding: 6px; color: #fff; }
#msg dl.meta dt { float: left; width: 6em; font-weight: bold; }
#msg dt:after { content:':';}
#msg dl, #msg dt, #msg ul, #msg li, #header, #footer, #logmsg { font-family: verdana,arial,helvetica,sans-serif; font-size: 10pt;  }
#msg dl a { font-weight: bold}
#msg dl a:link    { color:#fc3; }
#msg dl a:active  { color:#ff0; }
#msg dl a:visited { color:#cc6; }
h3 { font-family: verdana,arial,helvetica,sans-serif; font-size: 10pt; font-weight: bold; }
#msg pre { white-space: pre-line; overflow: auto; background: #ffc; border: 1px #fa0 solid; padding: 6px; }
#logmsg { background: #ffc; border: 1px #fa0 solid; padding: 1em 1em 0 1em; }
#logmsg p, #logmsg pre, #logmsg blockquote { margin: 0 0 1em 0; }
#logmsg p, #logmsg li, #logmsg dt, #logmsg dd { line-height: 14pt; }
#logmsg h1, #logmsg h2, #logmsg h3, #logmsg h4, #logmsg h5, #logmsg h6 { margin: .5em 0; }
#logmsg h1:first-child, #logmsg h2:first-child, #logmsg h3:first-child, #logmsg h4:first-child, #logmsg h5:first-child, #logmsg h6:first-child { margin-top: 0; }
#logmsg ul, #logmsg ol { padding: 0; list-style-position: inside; margin: 0 0 0 1em; }
#logmsg ul { text-indent: -1em; padding-left: 1em; }#logmsg ol { text-indent: -1.5em; padding-left: 1.5em; }
#logmsg > ul, #logmsg > ol { margin: 0 0 1em 0; }
#logmsg pre { background: #eee; padding: 1em; }
#logmsg blockquote { border: 1px solid #fa0; border-left-width: 10px; padding: 1em 1em 0 1em; background: white;}
#logmsg dl { margin: 0; }
#logmsg dt { font-weight: bold; }
#logmsg dd { margin: 0; padding: 0 0 0.5em 0; }
#logmsg dd:before { content:'\00bb';}
#logmsg table { border-spacing: 0px; border-collapse: collapse; border-top: 4px solid #fa0; border-bottom: 1px solid #fa0; background: #fff; }
#logmsg table th { text-align: left; font-weight: normal; padding: 0.2em 0.5em; border-top: 1px dotted #fa0; }
#logmsg table td { text-align: right; border-top: 1px dotted #fa0; padding: 0.2em 0.5em; }
#logmsg table thead th { text-align: center; border-bottom: 1px solid #fa0; }
#logmsg table th.Corner { text-align: left; }
#logmsg hr { border: none 0; border-top: 2px dashed #fa0; height: 1px; }
#header, #footer { color: #fff; background: #636; border: 1px #300 solid; padding: 6px; }
#patch { width: 100%; }
#patch h4 {font-family: verdana,arial,helvetica,sans-serif;font-size:10pt;padding:8px;background:#369;color:#fff;margin:0;}
#patch .propset h4, #patch .binary h4 {margin:0;}
#patch pre {padding:0;line-height:1.2em;margin:0;}
#patch .diff {width:100%;background:#eee;padding: 0 0 10px 0;overflow:auto;}
#patch .propset .diff, #patch .binary .diff  {padding:10px 0;}
#patch span {display:block;padding:0 10px;}
#patch .modfile, #patch .addfile, #patch .delfile, #patch .propset, #patch .binary, #patch .copfile {border:1px solid #ccc;margin:10px 0;}
#patch ins {background:#dfd;text-decoration:none;display:block;padding:0 10px;}
#patch del {background:#fdd;text-decoration:none;display:block;padding:0 10px;}
#patch .lines, .info {color:#888;background:#fff;}
--></style>
<div id="msg">
<dl class="meta" style="font-size: 105%">
<dt style="float: left; width: 6em; font-weight: bold">Revision</dt> <dd><a style="font-weight: bold" href="https://core.trac.wordpress.org/changeset/45345">45345</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/45345","name":"Review Commit"}}</script></dd>
<dt style="float: left; width: 6em; font-weight: bold">Author</dt> <dd>tellyworth</dd>
<dt style="float: left; width: 6em; font-weight: bold">Date</dt> <dd>2019-05-17 11:05:45 +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.

Props dd32, paragoninitiativeenterprises.
See <a href="https://core.trac.wordpress.org/ticket/47186">#47186</a>.</pre>

<h3>Modified Paths</h3>
<ul>
<li><a href="#trunksrcwpadminincludesfilephp">trunk/src/wp-admin/includes/file.php</a></li>
<li><a href="#trunktestsphpunittestsfilephp">trunk/tests/phpunit/tests/file.php</a></li>
</ul>

</div>
<div id="patch">
<h3>Diff</h3>
<a id="trunksrcwpadminincludesfilephp"></a>
<div class="modfile"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Modified: trunk/src/wp-admin/includes/file.php</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- trunk/src/wp-admin/includes/file.php      2019-05-17 10:57:19 UTC (rev 45344)
+++ trunk/src/wp-admin/includes/file.php        2019-05-17 11:05:45 UTC (rev 45345)
</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="trunktestsphpunittestsfilephp"></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/file.php</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- trunk/tests/phpunit/tests/file.php        2019-05-17 10:57:19 UTC (rev 45344)
+++ trunk/tests/phpunit/tests/file.php  2019-05-17 11:05:45 UTC (rev 45345)
</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>
</div>
</div>

</body>
</html>