/*
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* Copyright (C) 2019 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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#include "fs_avb/fs_avb_util.h"
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#include <memory>
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#include <string>
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#include <vector>
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#include <android-base/strings.h>
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#include <fstab/fstab.h>
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#include <libavb/libavb.h>
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#include <libdm/dm.h>
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#include "avb_util.h"
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#include "util.h"
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namespace android {
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namespace fs_mgr {
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// Given a FstabEntry, loads and verifies the vbmeta, to extract the Avb Hashtree descriptor.
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std::unique_ptr<VBMetaData> LoadAndVerifyVbmeta(const FstabEntry& fstab_entry,
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const std::string& expected_public_key_blob,
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std::string* out_public_key_data,
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std::string* out_avb_partition_name,
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VBMetaVerifyResult* out_verify_result) {
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// Derives partition_name from blk_device to query the corresponding AVB HASHTREE descriptor
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// to setup dm-verity. The partition_names in AVB descriptors are without A/B suffix.
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std::string avb_partition_name = DeriveAvbPartitionName(fstab_entry, fs_mgr_get_slot_suffix(),
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fs_mgr_get_other_slot_suffix());
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if (out_avb_partition_name) {
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*out_avb_partition_name = avb_partition_name;
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}
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// Updates fstab_entry->blk_device from <partition> to /dev/block/dm-<N> if
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// it's a logical partition.
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std::string device_path = fstab_entry.blk_device;
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if (fstab_entry.fs_mgr_flags.logical &&
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!android::base::StartsWith(fstab_entry.blk_device, "/")) {
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dm::DeviceMapper& dm = dm::DeviceMapper::Instance();
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if (!dm.GetDmDevicePathByName(fstab_entry.blk_device, &device_path)) {
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LERROR << "Failed to resolve logical device path for: " << fstab_entry.blk_device;
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return nullptr;
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}
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}
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return LoadAndVerifyVbmetaByPath(device_path, avb_partition_name, expected_public_key_blob,
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true /* allow_verification_error */,
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false /* rollback_protection */, false /* is_chained_vbmeta */,
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out_public_key_data, nullptr /* out_verification_disabled */,
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out_verify_result);
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}
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// Given a path, loads and verifies the vbmeta, to extract the Avb Hashtree descriptor.
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std::unique_ptr<FsAvbHashtreeDescriptor> GetHashtreeDescriptor(
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const std::string& avb_partition_name, VBMetaData&& vbmeta) {
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if (!vbmeta.size()) return nullptr;
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std::vector<VBMetaData> vbmeta_images;
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vbmeta_images.emplace_back(std::move(vbmeta));
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return GetHashtreeDescriptor(avb_partition_name, vbmeta_images);
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}
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} // namespace fs_mgr
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} // namespace android
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