[ACS-11995] fix codeql path and command injection (#1292)

engines/base/src/main/java/org/alfresco/transform/base/executors/RuntimeExec.java

@@ -667,11 +667,7 @@ public class RuntimeExec
             {
                 String key = entry.getKey();
                 String value = entry.getValue() == null ? "" : entry.getValue();
-                if (value.contains("\n") || value.contains("\r") || value.contains("\0"))
-                {
-                    throw new IllegalArgumentException(
-                            "Command property '" + key + "' contains an illegal character");
-                }
+                validateCommandPropertyValue(key, value);
                 // progressively replace the property in the command
                 key = (VAR_OPEN + key + VAR_CLOSE);
                 int index = sb.indexOf(key);
@@ -704,6 +700,55 @@ public class RuntimeExec
         return adjustedCommandElements.toArray(new String[0]);
     }
 
+    private void validateCommandPropertyValue(String key, String value)
+    {
+        if (value.contains("\n") || value.contains("\r") || value.contains("\0"))
+        {
+            throw new IllegalArgumentException(
+                    "Command property '" + key + "' contains an illegal character");
+        }
+
+        if ("source".equals(key) || "target".equals(key))
+        {
+            validatePathProperty(key, value);
+        }
+        else if ("sourceMimetype".equals(key) || "targetMimetype".equals(key))
+        {
+            validateMimetypeProperty(key, value);
+        }
+    }
+
+    private void validatePathProperty(String key, String value)
+    {
+        if (value.isBlank())
+        {
+            throw new IllegalArgumentException("Command property '" + key + "' must not be blank");
+        }
+
+        // Allow quotes/backticks in paths; this class executes via Runtime.exec(String[]) (no shell parsing)
+
+        File file = new File(value);
+        if (!file.isAbsolute())
+        {
+            throw new IllegalArgumentException(
+                    "Command property '" + key + "' must be an absolute path");
+        }
+    }
+
+    private void validateMimetypeProperty(String key, String value)
+    {
+        if (value.isBlank())
+        {
+            throw new IllegalArgumentException("Command property '" + key + "' must not be blank");
+        }
+
+        if (!value.matches("^[a-zA-Z0-9!#$&^_.+-]+/[a-zA-Z0-9!#$&^_.+-]+$"))
+        {
+            throw new IllegalArgumentException(
+                    "Command property '" + key + "' is not a valid mimetype");
+        }
+    }
+
     /**
      * Object to carry the results of an execution to the caller.
      *

engines/base/src/test/java/org/alfresco/transform/base/metadata/AbstractMetadataExtractsIT.java

@@ -119,6 +119,10 @@ public abstract class AbstractMetadataExtractsIT
 
     private Map<String, Serializable> readExpectedMetadata(String filename, File actualMetadataFile) throws IOException
     {
+        if (filename.contains("..") || filename.contains("/") || filename.contains("\\"))
+        {
+            throw new IllegalArgumentException("Invalid expected metadata filename: " + filename);
+        }
         try (InputStream inputStream = this.getClass().getClassLoader().getResourceAsStream(filename))
         {
             if (inputStream == null)