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<title>[29761] branches/4.0: Add safeguards for when ext/hash is not compiled with PHP.</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/29761">29761</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/29761","name":"Review Commit"}}</script></dd>
<dt style="float: left; width: 6em; font-weight: bold">Author</dt> <dd>nacin</dd>
<dt style="float: left; width: 6em; font-weight: bold">Date</dt> <dd>2014-09-23 18:12:28 +0000 (Tue, 23 Sep 2014)</dd>
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<pre style='padding-left: 1em; margin: 2em 0; border-left: 2px solid #ccc; line-height: 1.25; font-size: 105%; font-family: sans-serif'>Add safeguards for when ext/hash is not compiled with PHP.
Merges <a href="https://core.trac.wordpress.org/changeset/29751">[29751]</a> to the 4.0 branch.
fixes <a href="https://core.trac.wordpress.org/ticket/29518">#29518</a>.</pre>
<h3>Modified Paths</h3>
<ul>
<li><a href="#branches40srcwpincludespluggablephp">branches/4.0/src/wp-includes/pluggable.php</a></li>
<li><a href="#branches40srcwpincludessessionphp">branches/4.0/src/wp-includes/session.php</a></li>
</ul>
<h3>Property Changed</h3>
<ul>
<li><a href="#branches40">branches/4.0/</a></li>
</ul>
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<h3>Diff</h3>
<span class="cx" style="display: block; padding: 0 10px">Index: branches/4.0
</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/4.0 2014-09-23 03:51:24 UTC (rev 29760)
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+++ branches/4.0 2014-09-23 18:12:28 UTC (rev 29761)
</ins><a id="branches40"></a>
<div class="propset"><h4 style="background-color: #eee; color: inherit; margin: 0; padding: 1.3em; font-size: 115%">Property changes: branches/4.0</h4>
<pre class="diff"><span>
</span></pre></div>
<a id="svnmergeinfo"></a>
<div class="modfile"><h4 style="background-color: #eee; color: inherit; margin: 0; padding: 1.3em; font-size: 115%">Modified: svn:mergeinfo</h4></div>
<span class="cx" style="display: block; padding: 0 10px"> /branches/3.1:18031
</span><span class="cx" style="display: block; padding: 0 10px"> /branches/3.3:20543
</span><span class="cx" style="display: block; padding: 0 10px"> /branches/3.4:21757
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-/trunk:18512
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+/trunk:18512,29751
</ins><span class="cx" style="display: block; padding: 0 10px">\ No newline at end of property
</span><a id="branches40srcwpincludespluggablephp"></a>
<div class="modfile"><h4 style="background-color: #eee; color: inherit; margin: 0; padding: 1.3em; font-size: 115%">Modified: branches/4.0/src/wp-includes/pluggable.php</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- branches/4.0/src/wp-includes/pluggable.php 2014-09-23 03:51:24 UTC (rev 29760)
+++ branches/4.0/src/wp-includes/pluggable.php 2014-09-23 18:12:28 UTC (rev 29761)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -669,8 +669,11 @@
</span><span class="cx" style="display: block; padding: 0 10px"> $pass_frag = substr($user->user_pass, 8, 4);
</span><span class="cx" style="display: block; padding: 0 10px">
</span><span class="cx" style="display: block; padding: 0 10px"> $key = wp_hash( $username . '|' . $pass_frag . '|' . $expiration . '|' . $token, $scheme );
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">- $hash = hash_hmac( 'sha256', $username . '|' . $expiration . '|' . $token, $key );
</del><span class="cx" style="display: block; padding: 0 10px">
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ // If ext/hash is not present, compat.php's hash_hmac() does not support sha256.
+ $algo = function_exists( 'hash' ) ? 'sha256' : 'sha1';
+ $hash = hash_hmac( $algo, $username . '|' . $expiration . '|' . $token, $key );
+
</ins><span class="cx" style="display: block; padding: 0 10px"> if ( ! hash_equals( $hash, $hmac ) ) {
</span><span class="cx" style="display: block; padding: 0 10px"> /**
</span><span class="cx" style="display: block; padding: 0 10px"> * Fires if a bad authentication cookie hash is encountered.
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -734,8 +737,11 @@
</span><span class="cx" style="display: block; padding: 0 10px"> $pass_frag = substr($user->user_pass, 8, 4);
</span><span class="cx" style="display: block; padding: 0 10px">
</span><span class="cx" style="display: block; padding: 0 10px"> $key = wp_hash( $user->user_login . '|' . $pass_frag . '|' . $expiration . '|' . $token, $scheme );
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">- $hash = hash_hmac( 'sha256', $user->user_login . '|' . $expiration . '|' . $token, $key );
</del><span class="cx" style="display: block; padding: 0 10px">
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ // If ext/hash is not present, compat.php's hash_hmac() does not support sha256.
+ $algo = function_exists( 'hash' ) ? 'sha256' : 'sha1';
+ $hash = hash_hmac( $algo, $user->user_login . '|' . $expiration . '|' . $token, $key );
+
</ins><span class="cx" style="display: block; padding: 0 10px"> $cookie = $user->user_login . '|' . $expiration . '|' . $token . '|' . $hash;
</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="branches40srcwpincludessessionphp"></a>
<div class="modfile"><h4 style="background-color: #eee; color: inherit; margin: 0; padding: 1.3em; font-size: 115%">Modified: branches/4.0/src/wp-includes/session.php</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- branches/4.0/src/wp-includes/session.php 2014-09-23 03:51:24 UTC (rev 29760)
+++ branches/4.0/src/wp-includes/session.php 2014-09-23 18:12:28 UTC (rev 29761)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -61,7 +61,12 @@
</span><span class="cx" style="display: block; padding: 0 10px"> * @return string A hash of the session token (a verifier).
</span><span class="cx" style="display: block; padding: 0 10px"> */
</span><span class="cx" style="display: block; padding: 0 10px"> final private function hash_token( $token ) {
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">- return hash( 'sha256', $token );
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ // If ext/hash is not present, use sha1() instead.
+ if ( function_exists( 'hash' ) ) {
+ return hash( 'sha256', $token );
+ } else {
+ return sha1( $token );
+ }
</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></pre>
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