move enable_localaccount.sh, make pam_offline use it

src/platform/pam_offline/authenticator.cc

 // Copyright (c) 2009-2010 The Chromium OS Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "pam_offline/authenticator.h"
 
 #include <openssl/sha.h>
 #include <openssl/evp.h>
 #include <openssl/err.h>
 #include <stdlib.h>
@@ skipping 153 matching lines @@
             cipher_text.begin() + header_size);
 
   string passphrase = WrapHashedPassword(master_key_file + ".salt",
                                          hashed_password);
 
   cipher_text.erase(cipher_text.begin(), cipher_text.begin() + header_size);
   return TestDecrypt(passphrase, salt, cipher_text);
 }
 
 bool Authenticator::TestAllMasterKeys(const Credentials &credentials) const {
+#ifdef CHROMEOS_PAM_LOCALACCOUNT
+  if (credentials.IsLocalAccount()) {
+    LOG(WARNING) << "Logging in with local account credentials.";
+    return true;
+  }
+#endif
+
   if (system_salt_.empty()) {
     LOG(ERROR) << "System salt not loaded.";
     return false;
   }
 
   string user_path(PathAppend(shadow_root_,
                               credentials.GetObfuscatedUsername(system_salt_)));
   string weak_hash(credentials.GetPasswordWeakHash(system_salt_));
   char index_str[5];
 
@@ skipping 12 matching lines @@
     if (TestOneMasterKey(master_key_file, weak_hash)) {
       // decrypted ok, return success
       return true;
     }
   }
 
   return false;
 }
 
 }  // namespace pam_offline