move enable_localaccount.sh, make pam_offline use it

src/platform/pam_offline/credentials.h

 // 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.
 
 // Credentials is the interface for objects that wrap up a set
 // of credentials with which we can authenticate.  At the moment, the
 // only implementation of this class is UsernamePassword.
 
 #ifndef PAM_OFFLINE_CREDENTIALS_H_
 #define PAM_OFFLINE_CREDENTIALS_H_
@@ skipping 16 matching lines @@
   virtual void GetFullUsername(char *name_buffer, int length) const = 0;
 
   // Returns the part of the username before the '@'
   //
   // Parameters
   //  name_buffer - Output buffer.
   //  length - Amount of space in name_buffer
   //
   virtual void GetPartialUsername(char *name_buffer, int length) const = 0;
 
+#ifdef CHROMEOS_PAM_LOCALACCOUNT
+  // returns true if we're willing to accept these credentials without
+  // talking to Google.
+  virtual bool IsLocalAccount() const = 0;
+#endif
+
   // Returns the obfuscated username, used as the name of the directory
   // containing the user's stateful data (and maybe used for other reasons
   // at some point.)
   virtual std::string GetObfuscatedUsername(const Blob &system_salt) const = 0;
 
   // Returns a "weak hash" of the user's password.  Requires the system
   // salt to compute.
   //
   // This hashes using the same algorithm that pam/pam_google/pam_mount use to
   // get the user's plaintext password passed on to the login session.  The
   // two hashing algorithms must be kept in sync, as the hash is used to derive
   // a passphrase for the master key.
   //
   // Parameters
   //  system_salt - A blob containing the current system salt value.
   //
   // Returns
   //  A std::string containing the weak hash encoded as a hex sequence in ASCII.
   //
   virtual std::string GetPasswordWeakHash(const Blob &system_salt) const = 0;
 };
 
 }  // namespace pam_offline
 
 #endif  // PAM_OFFLINE_CREDENTIALS_H_