// Copyright 2018 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

import "oaidl.idl";
import "ocidl.idl";

typedef enum ProtectionLevel {
  // No validation: This never validates anything.
  NONE = 0,
  // Path validation: This will validate that the data is being decrypted by an
  // executable whose NT path matches the executable that originally encrypted
  // it. This should only be used for executables in trusted paths e.g.
  // C:\Program Files, otherwise anyone could pretend to be your executable.
  PATH_VALIDATION = 1,
} ProtectionLevel;

[
  object,
  oleautomation,
  uuid(A949CB4E-C4F9-44C4-B213-6BF8AA9AC69C),
  helpstring("IElevator Interface"),
  pointer_default(unique)
]
interface IElevator : IUnknown
{
  // Elevators are exposed as methods on IElevator, and provide High Integrity
  // actions. Any changes to add or change a method in IElevator will require a
  // security review.
  //
  // Runs the Chrome Recovery CRX elevated.
  //
  // @param crx_path Path for the recovery CRX.
  // @param browser_appid Omaha AppID for the version of Chrome being recovered.
  // @param browser_version Version of Chrome for the recovery CRX.
  // @param session_id Omaha Session Id.
  // @param caller_proc_id The process id of the calling process.
  // @param proc_handle The process handle valid in the calling process context.
  HRESULT RunRecoveryCRXElevated([in, string] const WCHAR* crx_path,
                                 [in, string] const WCHAR* browser_appid,
                                 [in, string] const WCHAR* browser_version,
                                 [in, string] const WCHAR* session_id,
                                 [in] DWORD caller_proc_id,
                                 [out] ULONG_PTR* proc_handle);

  // Encrypts data with both caller and SYSTEM context DPAPI.
  //
  // @param protection_level the protection level to encrypt data at.
  // @param plaintext The plaintext data to encrypt.
  // @param ciphertext The ciphertext of the encrypted data. It is the
  //                   responsibility of the caller to free this memory using
  //                   SysFreeString.
  // @param last_error The result of calling GetLastError if the operation
  //                   failed.
  // @return S_OK on success. Any other value on failure.
  HRESULT EncryptData([in] ProtectionLevel protection_level,
                      [in] const BSTR plaintext,
                      [out] BSTR* ciphertext,
                      [out] DWORD* last_error);

  // Decrypts data with both caller and SYSTEM context DPAPI.
  //
  // This will only decrypt data that was encrypted via a paired EncryptData
  // call from same application, with identity determined by the protection
  // level of the original encrypt call.
  //
  // @param ciphertext The ciphertext data to decrypt.
  // @param plaintext The plaintext of the decrypted data. It is the
  //                  responsibility of the caller to free this memory using
  //                  SysFreeString.
  // @param last_error The result of calling GetLastError if the operation
  //                   failed.
  // @return S_OK on success. Any other value on failure.
  HRESULT DecryptData([in] const BSTR ciphertext,
                      [out] BSTR* plaintext,
                      [out] DWORD* last_error);
};

// The interfaces below are all IElevator with unique IIDs. IElevator is
// registered with unique IIDs for the various flavors of Chrome and Chromium.
// This allows the different flavors of Chrome/Chromium to co-exist without side
// effects.
[
  object,
  oleautomation,
  uuid(B88C45B9-8825-4629-B83E-77CC67D9CEED),
  helpstring("IElevatorChromium Interface"),
  pointer_default(unique)
]
interface IElevatorChromium : IElevator
{
};

[
  object,
  oleautomation,
  uuid(463ABECF-410D-407F-8AF5-0DF35A005CC8),
  helpstring("IElevatorChrome Interface"),
  pointer_default(unique)
]
interface IElevatorChrome : IElevator
{
};

[
  object,
  oleautomation,
  uuid(A2721D66-376E-4D2F-9F0F-9070E9A42B5F),
  helpstring("IElevatorChromeBeta Interface"),
  pointer_default(unique)
]
interface IElevatorChromeBeta : IElevator
{
};

[
  object,
  oleautomation,
  uuid(BB2AA26B-343A-4072-8B6F-80557B8CE571),
  helpstring("IElevatorChromeDev Interface"),
  pointer_default(unique)
]
interface IElevatorChromeDev : IElevator
{
};

[
  object,
  oleautomation,
  uuid(4F7CE041-28E9-484F-9DD0-61A8CACEFEE4),
  helpstring("IElevatorChromeCanary Interface"),
  pointer_default(unique)
]
interface IElevatorChromeCanary : IElevator
{
};

[
  uuid(0014D784-7012-4A79-8AB6-ADDB8193A06E),
  version(1.0),
  helpstring("Elevator 1.0 Type Library")
]
library ElevatorLib {
  importlib("stdole2.tlb");

  interface IElevator;
  interface IElevatorChromium;
  interface IElevatorChrome;
  interface IElevatorChromeBeta;
  interface IElevatorChromeDev;
  interface IElevatorChromeCanary;
};