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/*
* Copyright (C) 2022 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <sys/stat.h>
#include <fstream>
#include <optional>
#define LOG_TAG "SelfTargeting"
#include "androidfw/ResourceTypes.h"
#include "idmap2/BinaryStreamVisitor.h"
#include "idmap2/FabricatedOverlay.h"
#include "idmap2/Idmap.h"
#include "idmap2/Result.h"
using PolicyBitmask = android::ResTable_overlayable_policy_header::PolicyBitmask;
using PolicyFlags = android::ResTable_overlayable_policy_header::PolicyFlags;
using android::idmap2::BinaryStreamVisitor;
using android::idmap2::Idmap;
using android::idmap2::IdmapConstraints;
using android::idmap2::OverlayResourceContainer;
namespace android::self_targeting {
constexpr const mode_t kIdmapFilePermission = S_IRUSR | S_IWUSR; // u=rw-, g=---, o=---
extern "C" bool
CreateFrroFile(std::string& out_err_result, const std::string& packageName,
const std::string& overlayName, const std::string& targetPackageName,
const std::optional<std::string>& targetOverlayable,
const std::vector<FabricatedOverlayEntryParameters>& entries_params,
const std::string& frro_file_path) {
android::idmap2::FabricatedOverlay::Builder builder(packageName, overlayName,
targetPackageName);
if (targetOverlayable.has_value()) {
builder.SetOverlayable(targetOverlayable.value_or(std::string()));
}
for (const auto& entry_params : entries_params) {
const auto dataType = entry_params.data_type;
if (entry_params.data_binary_value.has_value()) {
builder.SetResourceValue(entry_params.resource_name, *entry_params.data_binary_value,
entry_params.binary_data_offset, entry_params.binary_data_size,
entry_params.configuration, entry_params.nine_patch);
} else if (dataType >= Res_value::TYPE_FIRST_INT && dataType <= Res_value::TYPE_LAST_INT) {
builder.SetResourceValue(entry_params.resource_name, dataType,
entry_params.data_value, entry_params.configuration);
} else if (dataType == Res_value::TYPE_STRING) {
builder.SetResourceValue(entry_params.resource_name, dataType,
entry_params.data_string_value , entry_params.configuration);
} else {
out_err_result = base::StringPrintf("Unsupported data type %d", dataType);
return false;
}
}
const auto frro = builder.Build();
std::ofstream fout(frro_file_path);
if (fout.fail()) {
out_err_result = base::StringPrintf("open output stream fail %s", std::strerror(errno));
return false;
}
auto result = frro->ToBinaryStream(fout);
if (!result) {
unlink(frro_file_path.c_str());
out_err_result = base::StringPrintf("to stream fail %s", result.GetErrorMessage().c_str());
return false;
}
fout.close();
if (fout.fail()) {
unlink(frro_file_path.c_str());
out_err_result = base::StringPrintf("output stream fail %s", std::strerror(errno));
return false;
}
if (chmod(frro_file_path.c_str(), kIdmapFilePermission) == -1) {
out_err_result = base::StringPrintf("Failed to change the file permission %s",
frro_file_path.c_str());
return false;
}
return true;
}
static PolicyBitmask GetFulfilledPolicy(const bool isSystem, const bool isVendor,
const bool isProduct, const bool isTargetSignature,
const bool isOdm, const bool isOem) {
auto fulfilled_policy = static_cast<PolicyBitmask>(PolicyFlags::PUBLIC);
if (isSystem) {
fulfilled_policy |= PolicyFlags::SYSTEM_PARTITION;
}
if (isVendor) {
fulfilled_policy |= PolicyFlags::VENDOR_PARTITION;
}
if (isProduct) {
fulfilled_policy |= PolicyFlags::PRODUCT_PARTITION;
}
if (isOdm) {
fulfilled_policy |= PolicyFlags::ODM_PARTITION;
}
if (isOem) {
fulfilled_policy |= PolicyFlags::OEM_PARTITION;
}
if (isTargetSignature) {
fulfilled_policy |= PolicyFlags::SIGNATURE;
}
// Not support actor_signature and config_overlay_signature
fulfilled_policy &=
~(PolicyFlags::ACTOR_SIGNATURE | PolicyFlags::CONFIG_SIGNATURE);
ALOGV(
"fulfilled_policy = 0x%08x, isSystem = %d, isVendor = %d, isProduct = %d,"
" isTargetSignature = %d, isOdm = %d, isOem = %d,",
fulfilled_policy, isSystem, isVendor, isProduct, isTargetSignature, isOdm, isOem);
return fulfilled_policy;
}
extern "C" bool
CreateIdmapFile(std::string& out_err, const std::string& targetPath, const std::string& overlayPath,
const std::string& idmapPath, const std::string& overlayName,
const bool isSystem, const bool isVendor, const bool isProduct,
const bool isTargetSignature, const bool isOdm, const bool isOem) {
// idmap files are mapped with mmap in libandroidfw. Deleting and recreating the idmap
// guarantees that existing memory maps will continue to be valid and unaffected. The file must
// be deleted before attempting to create the idmap, so that if idmap creation fails, the
// overlay will no longer be usable.
unlink(idmapPath.c_str());
const auto target = idmap2::TargetResourceContainer::FromPath(targetPath);
if (!target) {
out_err = base::StringPrintf("Failed to load target %s because of %s", targetPath.c_str(),
target.GetErrorMessage().c_str());
return false;
}
const auto overlay = OverlayResourceContainer::FromPath(overlayPath);
if (!overlay) {
out_err = base::StringPrintf("Failed to load overlay %s because of %s", overlayPath.c_str(),
overlay.GetErrorMessage().c_str());
return false;
}
// Overlay self target process. Only allow self-targeting types.
const auto fulfilled_policies = GetFulfilledPolicy(isSystem, isVendor, isProduct,
isTargetSignature, isOdm, isOem);
auto constraints = std::make_unique<const IdmapConstraints>();
const auto idmap = Idmap::FromContainers(**target, **overlay, overlayName,
fulfilled_policies, true /* enforce_overlayable */,
std::move(constraints));
if (!idmap) {
out_err = base::StringPrintf("Failed to create idmap because of %s",
idmap.GetErrorMessage().c_str());
return false;
}
std::ofstream fout(idmapPath.c_str());
if (fout.fail()) {
out_err = base::StringPrintf("Failed to create idmap %s because of %s", idmapPath.c_str(),
strerror(errno));
return false;
}
BinaryStreamVisitor visitor(fout);
(*idmap)->accept(&visitor);
fout.close();
if (fout.fail()) {
unlink(idmapPath.c_str());
out_err = base::StringPrintf("Failed to write idmap %s because of %s", idmapPath.c_str(),
strerror(errno));
return false;
}
if (chmod(idmapPath.c_str(), kIdmapFilePermission) == -1) {
out_err = base::StringPrintf("Failed to change the file permission %s", idmapPath.c_str());
return false;
}
return true;
}
extern "C" bool
GetFabricatedOverlayInfo(std::string& out_err, const std::string& overlay_path,
OverlayManifestInfo& out_info) {
const auto overlay = idmap2::FabricatedOverlayContainer::FromPath(overlay_path);
if (!overlay) {
out_err = base::StringPrintf("Failed to write idmap %s because of %s",
overlay_path.c_str(), strerror(errno));
return false;
}
out_info = (*overlay)->GetManifestInfo();
return true;
}
} // namespace android::self_targeting
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