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commit 2d69fde135302e8cff984bb2131ec69f2e396964
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Author: Mark Thomas <markt@apache.org>
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Date:   Tue Feb 6 11:41:16 2018 +0000
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    git-svn-id: https://svn.apache.org/repos/asf/tomcat/tc7.0.x/trunk@1823309 13f79535-47bb-0310-9956-ffa450edef68
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diff --git a/java/org/apache/catalina/realm/RealmBase.java b/java/org/apache/catalina/realm/RealmBase.java
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index 2098c2e8cc..9697440d35 100644
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--- java/org/apache/catalina/realm/RealmBase.java
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+++ java/org/apache/catalina/realm/RealmBase.java
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@@ -688,9 +688,9 @@ public abstract class RealmBase extends LifecycleMBeanBase implements Realm {
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         // Check each defined security constraint
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         String uri = request.getRequestPathMB().toString();
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-        // Bug47080 - in rare cases this may be null
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+        // Bug47080 - in rare cases this may be null or ""
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         // Mapper treats as '/' do the same to prevent NPE
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-        if (uri == null) {
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+        if (uri == null || uri.length() == 0) {
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             uri = "/";
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         }
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@@ -722,7 +722,8 @@ public abstract class RealmBase extends LifecycleMBeanBase implements Realm {
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                 }
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                 for(int k=0; k < patterns.length; k++) {
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-                    if(uri.equals(patterns[k])) {
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+                    // Exact match including special case for the context root.
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+                    if(uri.equals(patterns[k]) || patterns[k].length() == 0 && uri.equals("/")) {
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                         found = true;
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                         if(collection[j].findMethod(method)) {
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                             if(results == null) {
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diff -up webapps/docs/changelog.xml.orig webapps/docs/changelog.xml
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--- webapps/docs/changelog.xml.orig	2019-02-28 15:11:59.735767416 -0500
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+++ webapps/docs/changelog.xml	2019-02-28 15:12:23.805697236 -0500
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@@ -64,6 +64,10 @@
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         When generating a redirect to a directory in the Default Servlet, avoid
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         generating a protocol relative redirect. (markt)
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       </fix>
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+      <fix>
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+        <bug>62067</bug>: Correctly apply security constraints mapped to the
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+        context root using a URL pattern of "". (markt)
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+      </fix>
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     </changelog>
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   </subsection>
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 </section>