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<title>[41782] trunk/src/wp-login.php: Login and Registration: Prevent PHP warnings when POSTing to `wp-login.php` with an array as a `user_login` or `user_email` field.</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/41782">41782</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/41782","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>2017-10-06 17:36:12 +0000 (Fri, 06 Oct 2017)</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'>Login and Registration: Prevent PHP warnings when POSTing to `wp-login.php` with an array as a `user_login` or `user_email` field.
Props menakas, johnjamesjacoby.
Fixes <a href="https://core.trac.wordpress.org/ticket/40888">#40888</a>.</pre>
<h3>Modified Paths</h3>
<ul>
<li><a href="#trunksrcwploginphp">trunk/src/wp-login.php</a></li>
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<h3>Diff</h3>
<a id="trunksrcwploginphp"></a>
<div class="modfile"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Modified: trunk/src/wp-login.php</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- trunk/src/wp-login.php 2017-10-06 16:31:01 UTC (rev 41781)
+++ trunk/src/wp-login.php 2017-10-06 17:36:12 UTC (rev 41782)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -298,7 +298,7 @@
</span><span class="cx" style="display: block; padding: 0 10px"> function retrieve_password() {
</span><span class="cx" style="display: block; padding: 0 10px"> $errors = new WP_Error();
</span><span class="cx" style="display: block; padding: 0 10px">
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">- if ( empty( $_POST['user_login'] ) ) {
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ if ( empty( $_POST['user_login'] ) || ! is_string( $_POST['user_login'] ) ) {
</ins><span class="cx" style="display: block; padding: 0 10px"> $errors->add('empty_username', __('<strong>ERROR</strong>: Enter a username or email address.'));
</span><span class="cx" style="display: block; padding: 0 10px"> } elseif ( strpos( $_POST['user_login'], '@' ) ) {
</span><span class="cx" style="display: block; padding: 0 10px"> $user_data = get_user_by( 'email', trim( wp_unslash( $_POST['user_login'] ) ) );
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -565,8 +565,12 @@
</span><span class="cx" style="display: block; padding: 0 10px">
</span><span class="cx" style="display: block; padding: 0 10px"> login_header(__('Lost Password'), '<p class="message">' . __('Please enter your username or email address. You will receive a link to create a new password via email.') . '</p>', $errors);
</span><span class="cx" style="display: block; padding: 0 10px">
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">- $user_login = isset($_POST['user_login']) ? wp_unslash($_POST['user_login']) : '';
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ $user_login = '';
</ins><span class="cx" style="display: block; padding: 0 10px">
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ if ( isset( $_POST['user_login'] ) && is_string( $_POST['user_login'] ) ) {
+ $user_login = wp_unslash( $_POST['user_login'] );
+ }
+
</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"> <form name="lostpasswordform" id="lostpasswordform" action="<?php echo esc_url( network_site_url( 'wp-login.php?action=lostpassword', 'login_post' ) ); ?>" method="post">
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -757,9 +761,16 @@
</span><span class="cx" style="display: block; padding: 0 10px">
</span><span class="cx" style="display: block; padding: 0 10px"> $user_login = '';
</span><span class="cx" style="display: block; padding: 0 10px"> $user_email = '';
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+
</ins><span class="cx" style="display: block; padding: 0 10px"> if ( $http_post ) {
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">- $user_login = isset( $_POST['user_login'] ) ? $_POST['user_login'] : '';
- $user_email = isset( $_POST['user_email'] ) ? wp_unslash( $_POST['user_email'] ) : '';
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ if ( isset( $_POST['user_login'] ) && is_string( $_POST['user_login'] ) ) {
+ $user_login = $_POST['user_login'];
+ }
+
+ if ( isset( $_POST['user_email'] ) && is_string( $_POST['user_email'] ) ) {
+ $user_email = wp_unslash( $_POST['user_email'] );
+ }
+
</ins><span class="cx" style="display: block; padding: 0 10px"> $errors = register_new_user($user_login, $user_email);
</span><span class="cx" style="display: block; padding: 0 10px"> if ( !is_wp_error($errors) ) {
</span><span class="cx" style="display: block; padding: 0 10px"> $redirect_to = !empty( $_POST['redirect_to'] ) ? $_POST['redirect_to'] : 'wp-login.php?checkemail=registered';
</span></span></pre>
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