[SECURITY-2705]

src/main/java/org/jenkinsci/plugins/workflow/support/steps/input/InputStep.java

@@ -1,11 +1,14 @@
 package org.jenkinsci.plugins.workflow.support.steps.input;
 
 import hudson.Extension;
+import hudson.ExtensionList;
 import hudson.Util;
+import hudson.model.FileParameterDefinition;
 import hudson.model.ParameterDefinition;
 import hudson.model.PasswordParameterDefinition;
 import hudson.model.Run;
 import hudson.model.TaskListener;
+import hudson.model.ParameterDefinition.ParameterDescriptor;
 import hudson.util.Secret;
 import java.io.Serializable;
 import java.util.Collections;
@@ -247,5 +250,14 @@ private static <T> Map<String, Object> copyMapReplacingEntry(Map<String, ?> map,
             }
             return newMap;
         }
+
+        /** For the pipeline syntax generator page. */
+        public List<ParameterDescriptor> getParametersDescriptors() {
+            // See SECURITY-2705 on why we ban FileParemeterDefinition
+            return ExtensionList.lookup(ParameterDescriptor.class).stream().
+                    filter(descriptor -> descriptor.clazz != FileParameterDefinition.class).
+                    collect(Collectors.toList());
+        }
     }
+
 }

src/main/java/org/jenkinsci/plugins/workflow/support/steps/input/InputStepExecution.java

@@ -2,10 +2,12 @@
 
 import com.cloudbees.plugins.credentials.CredentialsParameterValue;
 import com.cloudbees.plugins.credentials.builds.CredentialsParameterBinder;
+import hudson.AbortException;
 import hudson.FilePath;
 import hudson.Util;
 import hudson.console.HyperlinkNote;
 import hudson.model.Failure;
+import hudson.model.FileParameterDefinition;
 import hudson.model.FileParameterValue;
 import hudson.model.Job;
 import hudson.model.ModelObject;
@@ -29,6 +31,8 @@
 import org.jenkinsci.plugins.workflow.steps.AbstractStepExecutionImpl;
 import org.jenkinsci.plugins.workflow.support.actions.PauseAction;
 import org.jenkinsci.plugins.workflow.graph.FlowNode;
+import org.kohsuke.accmod.Restricted;
+import org.kohsuke.accmod.restrictions.NoExternalUse;
 import org.kohsuke.stapler.HttpResponse;
 import org.kohsuke.stapler.StaplerRequest;
 import org.kohsuke.stapler.interceptor.RequirePOST;
@@ -45,6 +49,8 @@
 import java.util.concurrent.TimeoutException;
 import java.util.logging.Level;
 import java.util.logging.Logger;
+
+import jenkins.util.SystemProperties;
 import jenkins.util.Timer;
 import org.jenkinsci.plugins.workflow.steps.FlowInterruptedException;
 import org.jenkinsci.plugins.workflow.steps.StepContext;
@@ -56,6 +62,13 @@ public class InputStepExecution extends AbstractStepExecutionImpl implements Mod
 
     private static final Logger LOGGER = Logger.getLogger(InputStepExecution.class.getName());
 
+    // for testing only
+    static final String UNSAFE_PARAMETER_ALLOWED_PROPERTY_NAME = InputStepExecution.class.getName() + ".supportUnsafeParameters";
+
+    private static boolean isAllowUnsafeParameters() {
+        return  SystemProperties.getBoolean(UNSAFE_PARAMETER_ALLOWED_PROPERTY_NAME);
+    }
+
     /**
      * Result of the input.
      */
@@ -70,6 +83,20 @@ public class InputStepExecution extends AbstractStepExecutionImpl implements Mod
 
     @Override
     public boolean start() throws Exception {
+        // SECURITY-2705 if the escape hatch is allowed just warn about pending removal, otherwise fail the build before waiting
+        if (getHasUnsafeParameters()) {
+            if (isAllowUnsafeParameters()) {
+                getListener().getLogger().println("Support for FileParameters in the input step has been enabled via "
+                                                  + UNSAFE_PARAMETER_ALLOWED_PROPERTY_NAME + " which will be removed in a future release." +
+                        System.lineSeparator() +
+                        "Details on how to migrate your pipeline can be found online: https://jenkins.io/redirect/plugin/pipeline-input-step/file-parameters.");
+            } else {
+                throw new AbortException("Support for FileParameters in the input step is disabled and will be removed in a future release. " + 
+                                         System.lineSeparator() + "Details on how to migrate your pipeline can be found online: " + 
+                                          "https://jenkins.io/redirect/plugin/pipeline-input-step/file-parameters.");
+            }
+        }
+
         Run<?, ?> run = getRun();
         TaskListener listener = getListener();
         FlowNode node = getNode();
@@ -406,15 +433,28 @@ private Map<String,Object> parseValue(StaplerRequest request) throws ServletExce
     }
 
     private Object convert(String name, ParameterValue v) throws IOException, InterruptedException {
-        if (v instanceof FileParameterValue) {
-            FileParameterValue fv = (FileParameterValue) v;
-            FilePath fp = new FilePath(getRun().getRootDir()).child(name);
-            fp.copyFrom(fv.getFile());
-            return fp;
+        if (v instanceof FileParameterValue) {  // SECURITY-2705
+            if (isAllowUnsafeParameters()) {
+                FileParameterValue fv = (FileParameterValue) v;
+                FilePath fp = new FilePath(getRun().getRootDir()).child(name);
+                fp.copyFrom(fv.getFile());
+                return fp;
+            } else {
+                // whilst the step would be aborted in start() if the pipeline was in the input step at the point of
+                // upgrade it will be allowed to pass so we pick it up here.
+                throw new AbortException("Support for FileParameters in the input step is disabled and will be removed in a future release. " + 
+                        System.lineSeparator() + "Details on how to migrate your pipeline can be found online: " + 
+                         "https://jenkins.io/redirect/plugin/pipeline-input-step/file-parameters.");
+            }
         } else {
             return v.getValue();
         }
     }
 
+    @Restricted(NoExternalUse.class) // jelly access only
+    public boolean getHasUnsafeParameters() {
+        return input.getParameters().stream().anyMatch(parameter -> parameter.getClass() == FileParameterDefinition.class);
+    }
+
     private static final long serialVersionUID = 1L;
 }

src/main/resources/org/jenkinsci/plugins/workflow/support/steps/input/InputStepExecution/index.jelly

@@ -7,6 +7,13 @@
   <h1>${it.input.message}</h1>
   <j:if test="${!it.completed}">
     <f:form method="post" action="${it.id}/submit" name="${it.id}">
+      <j:if test="${it.hasUnsafeParameters}">
+        <div class="alert alert-warning">
+        Support for <code>FileParameter</code>s will be removed in a future release.
+        Details on how to migrate your pipeline can be found 
+        <a rel="noopener noreferrer" href="https://jenkins.io/redirect/plugin/pipeline-input-step/file-parameters">online</a>.
+        </div>
+      </j:if>
       <j:forEach var="param" items="${it.input.parameters}">
         <j:set var="escapeEntryTitleAndDescription" value="true"/>
         <st:include page="index.jelly" it="${param}"/>

src/test/java/org/jenkinsci/plugins/workflow/support/steps/input/InputStepTest.java

@@ -34,6 +34,7 @@
 import com.gargoylesoftware.htmlunit.WebRequest;
 import com.gargoylesoftware.htmlunit.html.HtmlAnchor;
 import com.gargoylesoftware.htmlunit.html.HtmlElementUtil;
+import com.gargoylesoftware.htmlunit.html.HtmlFileInput;
 import com.gargoylesoftware.htmlunit.html.HtmlForm;
 import com.gargoylesoftware.htmlunit.html.HtmlPage;
 import com.google.common.base.Predicate;
@@ -48,12 +49,14 @@
 import hudson.model.queue.QueueTaskFuture;
 
 
+import java.io.File;
 import java.io.IOException;
 
 import hudson.security.ACL;
 import hudson.security.ACLContext;
 import hudson.util.Secret;
 import jenkins.model.IdStrategy;
+import jenkins.model.InterruptedBuildAction;
 import jenkins.model.Jenkins;
 import org.apache.commons.lang.StringUtils;
 import org.jenkinsci.plugins.plaincredentials.impl.StringCredentialsImpl;
@@ -63,11 +66,11 @@
 import org.jenkinsci.plugins.workflow.graphanalysis.DepthFirstScanner;
 import org.jenkinsci.plugins.workflow.job.WorkflowJob;
 import org.jenkinsci.plugins.workflow.job.WorkflowRun;
-import org.junit.Assert;
 import org.junit.ClassRule;
 import org.junit.Rule;
 import org.junit.Test;
 import org.jvnet.hudson.test.BuildWatcher;
+import org.jvnet.hudson.test.FlagRule;
 import org.jvnet.hudson.test.Issue;
 import org.jvnet.hudson.test.JenkinsRule;
 
@@ -80,15 +83,28 @@
 import edu.umd.cs.findbugs.annotations.Nullable;
 import org.jvnet.hudson.test.recipes.LocalData;
 
+import static org.hamcrest.MatcherAssert.assertThat;
+import static org.hamcrest.Matchers.allOf;
+import static org.hamcrest.Matchers.containsString;
+import static org.hamcrest.Matchers.hasItem;
+import static org.hamcrest.Matchers.instanceOf;
+import static org.hamcrest.Matchers.not;
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertFalse;
+import static org.junit.Assert.assertTrue;
+import static org.junit.Assert.assertNotNull;
+
 /**
  * @author Kohsuke Kawaguchi
  */
-public class InputStepTest extends Assert {
+public class InputStepTest {
     @Rule public JenkinsRule j = new JenkinsRule();
 
     @ClassRule
     public static BuildWatcher buildWatcher = new BuildWatcher();
 
+    @Rule public FlagRule<String> allowUnsafeParams = FlagRule.systemProperty(InputStepExecution.UNSAFE_PARAMETER_ALLOWED_PROPERTY_NAME, null);
+
     /**
      * Try out a parameter.
      */
@@ -475,6 +491,59 @@ public void passwordParameters() throws Exception {
         j.assertLogContains("Password is mySecret", b);
     }
 
+    @Issue("SECURITY-2705")
+    @Test
+    public void fileParameterWithEscapeHatch() throws Exception {
+        System.setProperty(InputStepExecution.UNSAFE_PARAMETER_ALLOWED_PROPERTY_NAME, "true");
+        WorkflowJob foo = j.jenkins.createProject(WorkflowJob.class, "foo");
+        foo.setDefinition(new CpsFlowDefinition("node {\n" +
+                "input message: 'Please provide a file', parameters: [file('paco.txt')], id: 'Id' \n" +
+                " }",true));
+
+        // get the build going, and wait until workflow pauses
+        QueueTaskFuture<WorkflowRun> q = foo.scheduleBuild2(0);
+        WorkflowRun b = q.waitForStart();
+        j.waitForMessage("Input requested", b);
+
+        InputAction action = b.getAction(InputAction.class);
+        assertEquals(1, action.getExecutions().size());
+
+        // submit the input, and expect a failure, no need to set any file value as the check we are testing takes
+        // place before we try to interact with the file
+        JenkinsRule.WebClient wc = j.createWebClient();
+        HtmlPage p = wc.getPage(b, action.getUrlName());
+        HtmlForm f = p.getFormByName("Id");
+        HtmlFileInput fileInput = f.getInputByName("file");
+        fileInput.setValueAttribute("dummy.txt");
+        fileInput.setContentType("text/csv");
+        String currentTime = "Current time " + System.currentTimeMillis();
+        fileInput.setData(currentTime.getBytes());
+        j.submit(f, "proceed");
+
+        j.assertBuildStatus(Result.SUCCESS, j.waitForCompletion(b));
+        assertTrue(new File(b.getRootDir(), "paco.txt").exists());
+        assertThat(JenkinsRule.getLog(b), 
+                allOf(containsString(InputStepExecution.UNSAFE_PARAMETER_ALLOWED_PROPERTY_NAME),
+                      containsString("will be removed in a future release"),
+                      containsString("https://jenkins.io/redirect/plugin/pipeline-input-step/file-parameters")));
+    }
+
+    @Issue("SECURITY-2705")
+    @Test
+    public void fileParameterShouldFailAtRuntime() throws Exception {
+        WorkflowJob foo = j.jenkins.createProject(WorkflowJob.class, "foo");
+        foo.setDefinition(new CpsFlowDefinition("input message: 'Please provide a file', parameters: [file('paco.txt')], id: 'Id'",true));
+
+        // get the build going, and wait until workflow pauses
+        QueueTaskFuture<WorkflowRun> q = foo.scheduleBuild2(0);
+        WorkflowRun b = q.waitForStart();
+
+        j.assertBuildStatus(Result.FAILURE, j.waitForCompletion(b));
+        assertThat(JenkinsRule.getLog(b), 
+                allOf(not(containsString(InputStepExecution.UNSAFE_PARAMETER_ALLOWED_PROPERTY_NAME)), 
+                      containsString("https://jenkins.io/redirect/plugin/pipeline-input-step/file-parameters")));
+    }
+
     @LocalData
     @Test public void serialForm() throws Exception {
         WorkflowJob p = j.jenkins.getItemByFullName("p", WorkflowJob.class);