Run ATH with CSP when csp.rule is defined

pom.xml

@@ -489,6 +489,7 @@ and
         <configuration>
           <reuseForks>false</reuseForks>
           <systemPropertyVariables>
+            <csp.rule>true</csp.rule>
             <!-- allow large xpaths https://www.oracle.com/java/technologies/javase/11-0-15-relnotes.html#JDK-8270504 -->
             <jdk.xml.xpathExprOpLimit>200</jdk.xml.xpathExprOpLimit>
             <mavenRepoPath>${settings.localRepository}</mavenRepoPath>
@@ -825,6 +826,19 @@ and
       <properties>
         <jenkins.version>2.462.3</jenkins.version>
       </properties>
+      <!-- TOOD remove when LTS line is at 2.481 or later -->
+      <build>
+        <plugins>
+          <plugin>
+            <artifactId>maven-surefire-plugin</artifactId>
+            <configuration>
+              <systemPropertyVariables>
+                <csp.rule>false</csp.rule>
+              </systemPropertyVariables>
+            </configuration>
+          </plugin>
+        </plugins>
+      </build>
     </profile>
   </profiles>
 </project>

src/main/java/org/jenkinsci/test/acceptance/junit/CspRule.java

@@ -0,0 +1,50 @@
+package org.jenkinsci.test.acceptance.junit;
+
+import com.google.inject.Inject;
+import com.google.inject.Injector;
+import org.jenkinsci.test.acceptance.po.GlobalSecurityConfig;
+import org.jenkinsci.test.acceptance.po.Jenkins;
+import org.jenkinsci.test.acceptance.update_center.PluginSpec;
+import org.junit.rules.TestRule;
+import org.junit.runner.Description;
+import org.junit.runners.model.Statement;
+
+@GlobalRule
+public final class CspRule implements TestRule {
+
+    @Inject
+    private Injector injector;
+
+    @Override
+    public Statement apply(final Statement base, final Description d) {
+        return new Statement() {
+            @Override
+            public void evaluate() throws Throwable {
+                if (isEnabled()
+                        && d.getAnnotation(WithInstallWizard.class) == null
+                        && d.getTestClass().getAnnotation(WithInstallWizard.class) == null) {
+                    Jenkins jenkins = injector.getInstance(Jenkins.class);
+
+                    PluginSpec plugin = new PluginSpec("csp");
+                    jenkins.getPluginManager().installPlugins(plugin);
+
+                    GlobalSecurityConfig security = new GlobalSecurityConfig(jenkins);
+                    security.open();
+                    security.disableCspReportOnly();
+                    security.save();
+                }
+                base.evaluate();
+            }
+
+            private static boolean isEnabled() {
+                if (System.getProperty("csp.rule") == null) {
+                    return false;
+                }
+                if (System.getProperty("csp.rule").isEmpty()) {
+                    return true;
+                }
+                return Boolean.getBoolean("csp.rule");
+            }
+        };
+    }
+}

src/main/java/org/jenkinsci/test/acceptance/po/GlobalSecurityConfig.java

@@ -27,6 +27,7 @@
 import java.net.URL;
 import org.jenkinsci.test.acceptance.plugins.authorize_project.BuildAccessControl;
 import org.jenkinsci.test.acceptance.plugins.git_client.ssh_host_key_verification.SshHostKeyVerificationStrategy;
+import org.openqa.selenium.By;
 import org.openqa.selenium.NoSuchElementException;
 import org.openqa.selenium.WebElement;
 
@@ -83,6 +84,10 @@ private void maybeCheckUseSecurity() {
         }
     }
 
+    public void disableCspReportOnly() {
+        control(By.name("_.reportOnly")).uncheck();
+    }
+
     public <T extends BuildAccessControl> T addBuildAccessControl(final Class<T> type) {
         final String path =
                 createPageArea("/jenkins-security-QueueItemAuthenticatorConfiguration/authenticators", () -> control(