90edd2e867
Qualcomm devices use a special `wrappedkey` mode for FBE. This is ported from CAF https://source.codeaurora.org/quic/la/platform/system/vold/commit/?h=LA.UM.7.8.r4-01000-SDM710.0&id=9229262d893a8592f7bc1b4e8a8dab7aad8df68c, originally by folks at Mokee for vold https://mokeedev.review/c/MoKee/android_system_vold/+/34102. This patch ports the above changes to `ext4crypt`, which we can use in recovery. Note that since we do not have `fs_mgr` in the recovery, we cannot read the `wrappedkey` flag from fstab. Instead, similar to `fbe.contents`, we use a special property `fbe.data.wrappedkey` to indicate support for wrappedkey mode. Devices that need to use this should set this property to `true` to activate corresponding code. Change-Id: I79c2855d577156670b45c10c7c7b1fcd9fece8d9
87 lines
3.0 KiB
C++
87 lines
3.0 KiB
C++
/*
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* Copyright (C) 2016 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef ANDROID_TWRP_KEYSTORAGE_H
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#define ANDROID_TWRP_KEYSTORAGE_H
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#include "Keymaster4.h"
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#include "KeyBuffer.h"
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#include <ext4_utils/ext4_crypt.h>
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#include <string>
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namespace android {
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namespace vold {
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namespace km = ::android::hardware::keymaster::V4_0;
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// Represents the information needed to decrypt a disk encryption key.
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// If "token" is nonempty, it is passed in as a required Gatekeeper auth token.
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// If "token" and "secret" are nonempty, "secret" is appended to the application-specific
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// binary needed to unlock.
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// If only "secret" is nonempty, it is used to decrypt in a non-Keymaster process.
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class KeyAuthentication {
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public:
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KeyAuthentication(std::string t, std::string s) : token{t}, secret{s} {};
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bool usesKeymaster() const { return !token.empty() || secret.empty(); };
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const std::string token;
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const std::string secret;
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};
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enum class KeyType {
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DE_SYS,
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DE_USER,
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CE_USER
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};
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extern const KeyAuthentication kEmptyAuthentication;
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// Checks if path "path" exists.
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bool pathExists(const std::string& path);
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bool createSecdiscardable(const std::string& path, std::string* hash);
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bool readSecdiscardable(const std::string& path, std::string* hash);
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// Create a directory at the named path, and store "key" in it,
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// in such a way that it can only be retrieved via Keymaster and
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// can be securely deleted.
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// It's safe to move/rename the directory after creation.
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bool storeKey(const std::string& dir, const KeyAuthentication& auth, const KeyBuffer& key);
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// Create a directory at the named path, and store "key" in it as storeKey
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// This version creates the key in "tmp_path" then atomically renames "tmp_path"
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// to "key_path" thereby ensuring that the key is either stored entirely or
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// not at all.
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bool storeKeyAtomically(const std::string& key_path, const std::string& tmp_path,
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const KeyAuthentication& auth, const KeyBuffer& key);
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// Retrieve the key from the named directory.
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bool retrieveKey(const std::string& dir, const KeyAuthentication& auth, KeyBuffer* key);
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// Securely destroy the key stored in the named directory and delete the directory.
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bool destroyKey(const std::string& dir);
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bool runSecdiscardSingle(const std::string& file);
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bool generateWrappedKey(userid_t user_id, KeyType key_type, KeyBuffer* key);
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bool getEphemeralWrappedKey(km::KeyFormat format, KeyBuffer& kmKey, KeyBuffer* key);
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} // namespace vold
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} // namespace android
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#endif
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