2b97a88ba4
Userspace reboot turned out to be a dead end and is no longer supported.
Therefore, remove the code from vold that handled keeping CE storage
unlocked past the userdata filesystem being unmounted and mounted.
This is a revert of commit 1c6731c649 (https://r.android.com/1254615)
with various conflicts resolved.
Bug: 292469129
Ignore-AOSP-First: Conflicts. Will cherry-pick after Android 14 push...
Change-Id: If530edaf7c1566dd3bd8b1322f935f38a2e66beb
79 lines
2.7 KiB
C++
79 lines
2.7 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_VOLD_KEYUTIL_H
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#define ANDROID_VOLD_KEYUTIL_H
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#include "KeyBuffer.h"
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#include "KeyStorage.h"
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#include <fscrypt/fscrypt.h>
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#include <memory>
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#include <string>
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namespace android {
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namespace vold {
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// Description of how to generate a key when needed.
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struct KeyGeneration {
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size_t keysize;
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bool allow_gen;
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bool use_hw_wrapped_key;
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};
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// Generate a key as specified in KeyGeneration
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bool generateStorageKey(const KeyGeneration& gen, KeyBuffer* key);
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// Returns a key with allow_gen false so generateStorageKey returns false;
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// this is used to indicate to retrieveOrGenerateKey that a key should not
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// be generated.
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const KeyGeneration neverGen();
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bool isFsKeyringSupported(void);
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// Install a file-based encryption key to the kernel, for use by encrypted files
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// on the specified filesystem using the specified encryption policy version.
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//
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// For v1 policies, we use FS_IOC_ADD_ENCRYPTION_KEY if the kernel supports it.
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// Otherwise we add the key to the legacy global session keyring.
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//
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// For v2 policies, we always use FS_IOC_ADD_ENCRYPTION_KEY; it's the only way
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// the kernel supports.
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//
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// Returns %true on success, %false on failure. On success also sets *policy
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// to the EncryptionPolicy used to refer to this key.
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bool installKey(const std::string& mountpoint, const android::fscrypt::EncryptionOptions& options,
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const KeyBuffer& key, android::fscrypt::EncryptionPolicy* policy);
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// Evict a file-based encryption key from the kernel.
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//
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// We use FS_IOC_REMOVE_ENCRYPTION_KEY if the kernel supports it. Otherwise we
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// remove the key from the legacy global session keyring.
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//
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// In the latter case, the caller is responsible for dropping caches.
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bool evictKey(const std::string& mountpoint, const android::fscrypt::EncryptionPolicy& policy);
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// Retrieves the key from the named directory, or generates it if it doesn't
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// exist.
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bool retrieveOrGenerateKey(const std::string& key_path, const std::string& tmp_path,
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const KeyAuthentication& key_authentication, const KeyGeneration& gen,
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KeyBuffer* key);
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} // namespace vold
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} // namespace android
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#endif
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