[tomcat] branch 9.0.x updated: Avoid protocol relative redirects

[markt]

This is an automated email from the ASF dual-hosted git repository.

markt pushed a commit to branch 9.0.x
in repository https://gitbox.apache.org/repos/asf/tomcat.git


The following commit(s) were added to refs/heads/9.0.x by this push:
     new 77c0ce2d16 Avoid protocol relative redirects
77c0ce2d16 is described below

commit 77c0ce2d169efa248b64b992e547aad549ec906b
Author: Mark Thomas <ma...@apache.org>
AuthorDate: Tue Aug 22 11:31:23 2023 -0700

    Avoid protocol relative redirects
---
 java/org/apache/catalina/authenticator/FormAuthenticator.java | 6 ++++++
 webapps/docs/changelog.xml                                    | 3 +++
 2 files changed, 9 insertions(+)

diff --git a/java/org/apache/catalina/authenticator/FormAuthenticator.java 
b/java/org/apache/catalina/authenticator/FormAuthenticator.java
index a57db51776..d54cc62182 100644
--- a/java/org/apache/catalina/authenticator/FormAuthenticator.java
+++ b/java/org/apache/catalina/authenticator/FormAuthenticator.java
@@ -747,6 +747,12 @@ public class FormAuthenticator extends AuthenticatorBase {
             sb.append('?');
             sb.append(saved.getQueryString());
         }
+
+        // Avoid protocol relative redirects
+        while (sb.length() > 1 && sb.charAt(1) == '/') {
+            sb.deleteCharAt(0);
+        }
+
         return sb.toString();
     }
 }
diff --git a/webapps/docs/changelog.xml b/webapps/docs/changelog.xml
index 94948bae1b..80d0b214a8 100644
--- a/webapps/docs/changelog.xml
+++ b/webapps/docs/changelog.xml
@@ -117,6 +117,9 @@
         Update code comments and Tomcat output to use MiB for 1024 * 1024 bytes
         and KiB for 1024 bytes rather than MB and kB. (martk)
       </fix>
+      <fix>
+        Avoid protocol relative redirects in FORM authentication. (markt)
+      </fix>
     </changelog>
   </subsection>
   <subsection name="Web applications">


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