From cc742bbcd6acf27a34928f6ae48e23ce2dbde93f Mon Sep 17 00:00:00 2001
From: Karl Mortensen <kmortensen@basistech.com>
Date: Mon, 28 Dec 2015 17:12:07 -0500
Subject: [PATCH] Check if permissions are sufficient to read and write output
 folder

---
 .../sleuthkit/autopsy/coreutils/FileUtil.java | 39 +++++++++++++++++++
 .../modules/photoreccarver/Bundle.properties  |  4 +-
 .../PhotoRecCarverFileIngestModule.java       |  7 ++++
 3 files changed, 49 insertions(+), 1 deletion(-)

diff --git a/Core/src/org/sleuthkit/autopsy/coreutils/FileUtil.java b/Core/src/org/sleuthkit/autopsy/coreutils/FileUtil.java
index a6f11ec684..159bb6efce 100644
--- a/Core/src/org/sleuthkit/autopsy/coreutils/FileUtil.java
+++ b/Core/src/org/sleuthkit/autopsy/coreutils/FileUtil.java
@@ -22,6 +22,11 @@ import java.io.File;
 import java.io.IOException;
 import java.util.logging.Level;
 import org.openide.filesystems.FileObject;
+import java.io.BufferedReader;
+import java.io.FileReader;
+import java.io.FileWriter;
+import java.nio.file.Files;
+import java.nio.file.Path;
 
 /**
  * File and dir utilities
@@ -29,6 +34,8 @@ import org.openide.filesystems.FileObject;
 public class FileUtil {
 
     private static final Logger logger = Logger.getLogger(FileUtil.class.getName());
+    private static String TEST_STRING = "Testing";
+    private static String TEMP_FILE_PREFIX = "Autopsy";
 
     /**
      * Recursively delete all of the files and sub-directories in a directory.
@@ -167,4 +174,36 @@ public class FileUtil {
         //with underscores. We are only keeping \ as it could be part of the path.
         return fileName.replaceAll("[/:\"*?<>|]+", "_");
     }
+
+    /**
+     * Test if the current user has read and write access to the path.
+     *
+     * @param path The path to test for read and write access.
+     *
+     * @return True if we have both read and write access, false otherwise.
+     */
+    public static boolean arePermissionsAppropriate(Path path) {
+        Path p = null;
+        try {
+            p = Files.createTempFile(path, TEMP_FILE_PREFIX, null);
+            try (FileWriter fw = new FileWriter(p.toFile(), false)) {
+                fw.write(TEST_STRING);
+            }
+
+            String result;
+            try (BufferedReader br = new BufferedReader(new FileReader(p.toFile()))) {
+                result = br.readLine();
+            }
+            return result.compareTo(TEST_STRING) == 0;
+        } catch (Exception ex) {
+            return false;
+        } finally {
+            if (p != null) {
+                try {
+                    p.toFile().delete();
+                } catch (Exception ignored) {
+                }
+            }
+        }
+    }
 }
diff --git a/Core/src/org/sleuthkit/autopsy/modules/photoreccarver/Bundle.properties b/Core/src/org/sleuthkit/autopsy/modules/photoreccarver/Bundle.properties
index ed1afb9be9..0d18ff4e2f 100755
--- a/Core/src/org/sleuthkit/autopsy/modules/photoreccarver/Bundle.properties
+++ b/Core/src/org/sleuthkit/autopsy/modules/photoreccarver/Bundle.properties
@@ -23,4 +23,6 @@ PhotoRecIngestModule.NotEnoughDiskSpace.detail.msg=PhotoRec error processing {0}
 PhotoRecIngestModule.cancelledByUser=PhotoRec cancelled by user.
 PhotoRecIngestModule.error.exitValue=PhotoRec carver returned error exit value = {0} when scanning {1}
 PhotoRecIngestModule.error.msg=Error processing {0} with PhotoRec carver.
-PhotoRecIngestModule.complete.numberOfErrors=Number of Errors while Carving\:
\ No newline at end of file
+PhotoRecIngestModule.complete.numberOfErrors=Number of Errors while Carving\:
+PhotoRecIngestModule.PermissionsNotSufficient=Insufficient permissions accessing
+PhotoRecIngestModule.PermissionsNotSufficientSeeReference=See "Shared Drive Authentication" in Autopsy help.
\ No newline at end of file
diff --git a/Core/src/org/sleuthkit/autopsy/modules/photoreccarver/PhotoRecCarverFileIngestModule.java b/Core/src/org/sleuthkit/autopsy/modules/photoreccarver/PhotoRecCarverFileIngestModule.java
index b923c4294a..16e3659777 100755
--- a/Core/src/org/sleuthkit/autopsy/modules/photoreccarver/PhotoRecCarverFileIngestModule.java
+++ b/Core/src/org/sleuthkit/autopsy/modules/photoreccarver/PhotoRecCarverFileIngestModule.java
@@ -77,6 +77,7 @@ final class PhotoRecCarverFileIngestModule implements FileIngestModule {
     private static final String PHOTOREC_REPORT = "report.xml"; //NON-NLS
     private static final String LOG_FILE = "run_log.txt"; //NON-NLS
     private static final String TEMP_DIR_NAME = "temp"; // NON-NLS
+    private static final String SEP = System.getProperty("line.separator");
     private static final Logger logger = Logger.getLogger(PhotoRecCarverFileIngestModule.class.getName());
     private static final HashMap<Long, IngestJobTotals> totalsForIngestJobs = new HashMap<>();
     private static final IngestModuleReferenceCounter refCounter = new IngestModuleReferenceCounter();
@@ -383,6 +384,12 @@ final class PhotoRecCarverFileIngestModule implements FileIngestModule {
             if (path == null) {
                 throw new IngestModule.IngestModuleException(NbBundle.getMessage(PhotoRecCarverFileIngestModule.class, "PhotoRecIngestModule.nonHostnameUNCPathUsed"));
             }
+            if (false == FileUtil.arePermissionsAppropriate(path)) {
+                throw new IngestModule.IngestModuleException(
+                        NbBundle.getMessage(PhotoRecCarverFileIngestModule.class, "PhotoRecIngestModule.PermissionsNotSufficient")
+                        + SEP + path.toString()+ SEP +
+                        NbBundle.getMessage(PhotoRecCarverFileIngestModule.class, "PhotoRecIngestModule.PermissionsNotSufficientSeeReference"));
+            }
         }
         try {
             Files.createDirectory(path);