Merge pull request #896 from mr-tz/simplify-lang-config

simplify language configuration
mandiant · Nov 9, 2023 · 52747a4 · 52747a4
2 parents d49c6cf + 7dce9ad
commit 52747a4
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Showing 2 changed files with 23 additions and 11 deletions.
diff --git a/floss/language/go/extract.py b/floss/language/go/extract.py
@@ -276,7 +276,9 @@ def get_string_blob_strings(pe: pefile.PE, min_length) -> Iterable[StaticString]
         try:
             string_blob_start, string_blob_end = find_string_blob_range(pe, struct_strings)
         except ValueError:
-            logger.warning("Failed to find string blob range: Go version may be unsupported.")
+            logger.warning(
+                "Failed to find string blob range: Is this a Go binary? If so, the Go version may be unsupported."
+            )
             return
 
     with floss.utils.timing("collect string blob strings"):

diff --git a/floss/main.py b/floss/main.py
@@ -546,28 +546,38 @@ def main(argv=None) -> int:
 
     static_runtime = get_runtime_diff(interim)
 
-    lang_id = identify_language(sample, static_strings)
-
     # set language configurations
-    if (lang_id == Language.GO and args.language == "") or args.language == Language.GO.value:
+    lang_id: Language
+    if args.language == Language.GO.value:
+        lang_id = Language.GO
+    elif args.language == Language.RUST.value:
+        lang_id = Language.RUST
+    elif args.language == Language.DOTNET.value:
+        lang_id = Language.DOTNET
+    elif args.language == "none":
+        lang_id = Language.UNKNOWN
+    else:
+        lang_id = identify_language(sample, static_strings)
+
+    if lang_id == Language.GO:
         if analysis.enable_tight_strings or analysis.enable_stack_strings or analysis.enable_decoded_strings:
             logger.warning(
                 "FLOSS handles Go static strings, but string deobfuscation may be inaccurate and take a long time"
             )
         results.metadata.language = Language.GO.value
 
-    elif (lang_id == Language.RUST and args.language == "") or args.language == Language.RUST.value:
+    elif lang_id == Language.RUST:
         if analysis.enable_tight_strings or analysis.enable_stack_strings or analysis.enable_decoded_strings:
             logger.warning(
                 "FLOSS handles Rust static strings, but string deobfuscation may be inaccurate and take a long time"
             )
         results.metadata.language = Language.RUST.value
 
-    elif (lang_id == Language.DOTNET and args.language == "") or args.language == Language.DOTNET.value:
-        logger.warning(".NET language-specific string extraction is not supported")
-        logger.warning(" will NOT deobfuscate any .NET strings")
+    elif lang_id == Language.DOTNET:
+        logger.warning(".NET language-specific string extraction is not supported yet")
+        logger.warning("Furthermore, FLOSS does NOT attempt to deobfuscate any strings from .NET binaries")
 
-        # let's enable .NET strings after we can deobfuscate them
+        # enable .NET strings once we can extract them
         # results.metadata.language = Language.DOTNET.value
 
         # TODO for pure .NET binaries our deobfuscation algorithms do nothing, but for mixed-mode assemblies they may
@@ -604,7 +614,7 @@ def main(argv=None) -> int:
         if not lang_id:
             logger.info("extracting static strings")
         else:
-            if (lang_id == Language.GO and args.language == "") or args.language == Language.GO.value:
+            if lang_id == Language.GO:
                 logger.info("extracting language-specific Go strings")
 
                 interim = time()
@@ -615,7 +625,7 @@ def main(argv=None) -> int:
                     static_strings, results.strings.language_strings, args.min_length
                 )
 
-            elif (lang_id == Language.RUST and args.language == "") or args.language == Language.RUST.value:
+            elif lang_id == Language.RUST:
                 logger.info("extracting language-specific Rust strings")
 
                 interim = time()