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// Copyright 2018 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CHROME_ELEVATION_SERVICE_ELEVATOR_H_
#define CHROME_ELEVATION_SERVICE_ELEVATOR_H_
#include <windows.h>
#include <wrl/implements.h>
#include <string>
#include "base/gtest_prod_util.h"
#include "chrome/elevation_service/elevation_service_idl.h"
namespace elevation_service {
// These flags can modify the EncryptData operation. They are packed inside the
// `protection_level` argument. Access these via the `EncryptAppBoundString` API
// in chrome.
struct EncryptFlags {
// Specify that the Encrypt operation should always use the latest key.
bool use_latest_key = false;
};
inline constexpr IID kTestElevatorClsid = {
0x416C51AC,
0x4DEF,
0x43CA,
{0xE7, 0x35, 0xE7, 0x35, 0x21, 0x0A, 0xB2,
0x57}}; // Elevator Test CLSID. {416C51AC-4DEF-43CA-96E8-E735210AB257}
namespace switches {
inline constexpr char kElevatorClsIdForTestingSwitch[] =
"elevator-clsid-for-testing";
inline constexpr char kFakeReencryptForTestingSwitch[] =
"elevator-fake-reencrypt-for-testing";
} // namespace switches
namespace internal {
inline constexpr uint32_t kFlagUseLatestKey = 1 << 23;
// Update this each time a new flag is added.
inline constexpr uint32_t kMaxFlag = kFlagUseLatestKey;
// A static assert verifies the flags can always fit into 24 bits.
static_assert((kMaxFlag & 0xFFFFFF) == kMaxFlag);
constexpr uint32_t PackFlagsAndProtectionLevel(uint32_t flags,
uint8_t protection_level) {
return ((flags & 0xFFFFFF) << 8) | protection_level;
}
constexpr uint32_t ExtractFlags(uint32_t packed) {
return (packed >> 8) & 0xFFFFFF;
}
constexpr uint8_t ExtractProtectionLevel(uint32_t packed) {
return static_cast<uint8_t>(packed & 0xFF);
}
// Tests for these basic functions can be static asserts.
static_assert(ExtractProtectionLevel(PackFlagsAndProtectionLevel(0, 0)) == 0);
static_assert(ExtractFlags(PackFlagsAndProtectionLevel(0x123456, 0x01)) ==
0x123456);
static_assert(ExtractFlags(PackFlagsAndProtectionLevel(0xAA123456, 0)) ==
0x123456);
static_assert(ExtractFlags(PackFlagsAndProtectionLevel(0, 0)) == 0);
static_assert(ExtractProtectionLevel(PackFlagsAndProtectionLevel(0, 0x01)) ==
0x01);
static_assert(
ExtractProtectionLevel(PackFlagsAndProtectionLevel(0x1234, 0x01)) == 0x01);
static_assert(ExtractProtectionLevel(PackFlagsAndProtectionLevel(0x12345678,
0x01)) ==
0x01);
} // namespace internal
class Elevator
: public Microsoft::WRL::RuntimeClass<
Microsoft::WRL::RuntimeClassFlags<Microsoft::WRL::ClassicCom>,
IElevator,
IElevatorChromium,
IElevatorChrome,
IElevatorChromeBeta,
IElevatorChromeDev,
IElevatorChromeCanary> {
public:
// Failure codes.
static constexpr HRESULT kErrorCouldNotObtainCallingProcess =
MAKE_HRESULT(SEVERITY_ERROR, FACILITY_ITF, 0xA001);
static constexpr HRESULT kErrorCouldNotGenerateValidationData =
MAKE_HRESULT(SEVERITY_ERROR, FACILITY_ITF, 0xA002);
static constexpr HRESULT kErrorCouldNotDecryptWithUserContext =
MAKE_HRESULT(SEVERITY_ERROR, FACILITY_ITF, 0xA003);
static constexpr HRESULT kErrorCouldNotDecryptWithSystemContext =
MAKE_HRESULT(SEVERITY_ERROR, FACILITY_ITF, 0xA004);
static constexpr HRESULT kErrorCouldNotEncryptWithUserContext =
MAKE_HRESULT(SEVERITY_ERROR, FACILITY_ITF, 0xA005);
static constexpr HRESULT kErrorCouldNotEncryptWithSystemContext =
MAKE_HRESULT(SEVERITY_ERROR, FACILITY_ITF, 0xA006);
static constexpr HRESULT kValidationDidNotPass =
MAKE_HRESULT(SEVERITY_ERROR, FACILITY_ITF, 0xA007);
static constexpr HRESULT kErrorCouldNotObtainPath =
MAKE_HRESULT(SEVERITY_ERROR, FACILITY_ITF, 0xA008);
static constexpr HRESULT kErrorUnsupportedFilePath =
MAKE_HRESULT(SEVERITY_ERROR, FACILITY_ITF, 0xA009);
static constexpr HRESULT kErrorUnsupportedProtectionLevel =
MAKE_HRESULT(SEVERITY_ERROR, FACILITY_ITF, 0xA00A);
// Success codes.
static constexpr HRESULT kSuccessShouldReencrypt =
MAKE_HRESULT(SEVERITY_SUCCESS, FACILITY_ITF, 0xA001);
Elevator() = default;
Elevator(const Elevator&) = delete;
Elevator& operator=(const Elevator&) = delete;
// Securely validates and runs the provided Chrome Recovery CRX elevated, by
// first copying the CRX to a secure directory under %ProgramFiles% to
// validate and unpack the CRX.
IFACEMETHODIMP RunRecoveryCRXElevated(const wchar_t* crx_path,
const wchar_t* browser_appid,
const wchar_t* browser_version,
const wchar_t* session_id,
DWORD caller_proc_id,
ULONG_PTR* proc_handle) override;
IFACEMETHODIMP EncryptData(ProtectionLevel protection_level,
const BSTR plaintext,
BSTR* ciphertext,
DWORD* last_error) override;
IFACEMETHODIMP DecryptData(const BSTR ciphertext,
BSTR* plaintext,
DWORD* last_error) override;
private:
FRIEND_TEST_ALL_PREFIXES(ElevatorTest, StringHandlingTest);
~Elevator() override = default;
// Appends a string `to_append` to an existing string `base`, first the four
// byte length then the string.
static void AppendStringWithLength(const std::string& to_append,
std::string& base);
// Pulls a string from the start of the string, `str` is shortened to the
// remainder of the string. `str` should have been a string previously passed
// to AppendStringWithLength, so that it contains the four byte prefix of
// length.
static std::string PopFromStringFront(std::string& str);
};
} // namespace elevation_service
#endif // CHROME_ELEVATION_SERVICE_ELEVATOR_H_
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