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<title>[53022] Filesystem API: Include the `ssh-ed25519` public key signature algorithm as an alternative to `ssh-rsa`.</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/53022">53022</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/53022","name":"Review Commit"}}</script></dd>
<dt style="float: left; width: 6em; font-weight: bold">Author</dt> <dd>audrasjb</dd>
<dt style="float: left; width: 6em; font-weight: bold">Date</dt> <dd>2022-03-29 16:28:45 +0000 (Tue, 29 Mar 2022)</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'>Filesystem API: Include the `ssh-ed25519` public key signature algorithm as an alternative to `ssh-rsa`.
The `ssh-rsa` signature algorithm is disabled by default as of OpenSSH 8.8, which breaks SSH2 uploads in WordPress on modern systems. `ssh-ed25519` is one of the suggested alternatives, supported since OpenSSH 6.5.
References:
- OpenSSH 8.2 release notes
- OpenSSH 8.7 release notes
- OpenSSH 8.8 release notes
Follow-up to <a href="https://core.trac.wordpress.org/changeset/8865">[8865]</a>.
Props richybkreckel, dd32, SergeyBiryukov.
Merges <a href="https://core.trac.wordpress.org/changeset/52807">[52807]</a> to the 5.9 branch.
Fixes <a href="https://core.trac.wordpress.org/ticket/52409">#52409</a>.</pre>
<h3>Modified Paths</h3>
<ul>
<li><a href="#branches59srcwpadminincludesclasswpfilesystemssh2php">branches/5.9/src/wp-admin/includes/class-wp-filesystem-ssh2.php</a></li>
</ul>
<h3>Property Changed</h3>
<ul>
<li><a href="#branches59">branches/5.9/</a></li>
</ul>
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<h3>Diff</h3>
<span class="cx" style="display: block; padding: 0 10px">Index: branches/5.9
</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/5.9 2022-03-29 16:22:29 UTC (rev 53021)
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+++ branches/5.9 2022-03-29 16:28:45 UTC (rev 53022)
</ins><a id="branches59"></a>
<div class="propset"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Property changes: branches/5.9</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/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><span class="cx" style="display: block; padding: 0 10px"> /branches/5.5:49373-49379,49381
</span><span class="cx" style="display: block; padding: 0 10px"> /branches/5.8:51889
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-/trunk:52453-52457,52535-52536,52547,52555,52558,52562-52563,52574,52589,52612-52613,52618,52626,52628,52631,52633,52637,52644,52648,52651,52656,52658,52662,52664,52668,52672-52673,52675-52677,52679,52681-52682,52686,52692,52694-52695,52697,52726,52730,52733-52735,52738,52741,52743-52744,52750,52752,52754,52757,52760,52763,52765,52768,52781,52791,52797,52802,52819,52844,52895,52939,52995,53012,53015,53020
</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:52453-52457,52535-52536,52547,52555,52558,52562-52563,52574,52589,52612-52613,52618,52626,52628,52631,52633,52637,52644,52648,52651,52656,52658,52662,52664,52668,52672-52673,52675-52677,52679,52681-52682,52686,52692,52694-52695,52697,52726,52730,52733-52735,52738,52741,52743-52744,52750,52752,52754,52757,52760,52763,52765,52768,52781,52791,52797,52802,52807,52819,52844,52895,52939,52995,53012,53015,53020
</ins><span class="cx" style="display: block; padding: 0 10px">\ No newline at end of property
</span><a id="branches59srcwpadminincludesclasswpfilesystemssh2php"></a>
<div class="modfile"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Modified: branches/5.9/src/wp-admin/includes/class-wp-filesystem-ssh2.php</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- branches/5.9/src/wp-admin/includes/class-wp-filesystem-ssh2.php 2022-03-29 16:22:29 UTC (rev 53021)
+++ branches/5.9/src/wp-admin/includes/class-wp-filesystem-ssh2.php 2022-03-29 16:28:45 UTC (rev 53022)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -88,7 +88,7 @@
</span><span class="cx" style="display: block; padding: 0 10px"> $this->options['public_key'] = $opt['public_key'];
</span><span class="cx" style="display: block; padding: 0 10px"> $this->options['private_key'] = $opt['private_key'];
</span><span class="cx" style="display: block; padding: 0 10px">
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">- $this->options['hostkey'] = array( 'hostkey' => 'ssh-rsa' );
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ $this->options['hostkey'] = array( 'hostkey' => 'ssh-rsa,ssh-ed25519' );
</ins><span class="cx" style="display: block; padding: 0 10px">
</span><span class="cx" style="display: block; padding: 0 10px"> $this->keys = true;
</span><span class="cx" style="display: block; padding: 0 10px"> } elseif ( empty( $opt['username'] ) ) {
</span></span></pre>
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