enhance mcafee_epo2john.py and add license blurb

run/mcafee_epo2john.py

@@ -6,17 +6,31 @@
 # ePO configuration is stored in a DB server. Authentication may be based on
 # AD or on a SHA1 hash stored in the DB.
 #
+# This script converts a CSV output of dbo.OrionUsers table to john format.
+# The CSV output must at least match the following schema:
+#   - column #1 -> Name   (not really used)
+#   - column #2 -> AuthURI
+#   - column separator must be ","
+#
+# ex:
+#
 # $ cat orion_users.csv      (extracted from dbo.OrionUsers)
 # Name,AuthURI
 # system,auth:pwd?pwd=kDv1oBRuGOU3MnpIDbyBJEmJZ%2FauS1zf  <-- SHA1 based
 # adminepo,auth:ntlm?domain=XYZ&user=adminepo             <-- AD based
 #
-# $ ./mcafee_epo2john.py < orion_users.csv > orion_hashes.txt
+# $ ./mcafee_epo2john.py orion_users.csv > orion_hashes.txt
 #
 # $ john -single orion_hashes.txt
 # Loaded 1 password hashes with 1 different salts (dynamic_24 [sha1($p.$s) 128/128 AVX 10x4x1])
 # Press 'q' or Ctrl-C to abort, almost any other key for status
 # system           (system)
+#
+#
+# This software is Copyright (c) Nicolas Collignon <nicolas.collignon@synacktiv.com>,
+# and it is hereby released to the general public under the following terms:
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted.
 
 import sys
 import urllib
@@ -39,5 +53,24 @@ def orion2john(f_in, f_out, sep=','):
         else:
             sys.stderr.write('invalid hash len: %i\n' % len(blob))
 
+
+def usage():
+    sys.stdout.write('usage: %s [dbo.OrionUsers CSV extracts]\n' % sys.argv[0])
+    sys.exit(1)
+
 if __name__ == '__main__':
-    orion2john(sys.stdin, sys.stdout)
+
+    if len(sys.argv) < 2:
+        usage()
+
+    for arg in sys.argv[1:]:
+
+        if arg == '-':
+            f = sys.stdin
+        else:
+            f = open(arg, 'rb')
+
+        orion2john(f, sys.stdout)
+
+        if f != sys.stdin:
+            f.close()