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Rename key_dir to metadata_key_dir and refactor

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Bug: 147814592
Test: Crosshatch boots
Change-Id: I9fce0ea5da9c81c2e4e9cf97b75c1cba821adf9e
This commit is contained in:
Paul Crowley 2020-01-30 15:26:15 -08:00
parent fda79ddd82
commit c9b92f0c17
1 changed files with 30 additions and 23 deletions
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53
MetadataCrypt.cpp
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@ -106,19 +106,19 @@ static void commit_key(const std::string& dir) {
}
static bool read_key(const FstabEntry& data_rec, bool create_if_absent, KeyBuffer* key) {
if (data_rec.key_dir.empty()) {
LOG(ERROR) << "Failed to get key_dir";
if (data_rec.metadata_key_dir.empty()) {
LOG(ERROR) << "Failed to get metadata_key_dir";
return false;
}
std::string key_dir = data_rec.key_dir;
std::string metadata_key_dir = data_rec.metadata_key_dir;
std::string sKey;
auto dir = key_dir + "/key";
LOG(DEBUG) << "key_dir/key: " << dir;
auto dir = metadata_key_dir + "/key";
LOG(DEBUG) << "metadata_key_dir/key: " << dir;
if (fs_mkdirs(dir.c_str(), 0700)) {
PLOG(ERROR) << "Creating directories: " << dir;
return false;
}
auto temp = key_dir + "/tmp";
auto temp = metadata_key_dir + "/tmp";
auto newKeyPath = dir + "/" + kFn_keymaster_key_blob_upgraded;
/* If we have a leftover upgraded key, delete it.
* We either failed an update and must return to the old key,
@ -153,10 +153,10 @@ static bool get_number_of_sectors(const std::string& real_blkdev, uint64_t* nr_s
return true;
}
static bool create_crypto_blk_dev(const std::string& dm_name, uint64_t nr_sec,
const std::string& real_blkdev, const KeyBuffer& key,
std::string* crypto_blkdev, bool set_dun) {
auto& dm = DeviceMapper::Instance();
static bool create_crypto_blk_dev(const std::string& dm_name, const FstabEntry* data_rec,
const KeyBuffer& key, std::string* crypto_blkdev) {
uint64_t nr_sec;
if (!get_number_of_sectors(data_rec->blk_device, &nr_sec)) return false;
KeyBuffer hex_key_buffer;
if (android::vold::StrToHex(key, hex_key_buffer) != android::OK) {
@ -165,15 +165,23 @@ static bool create_crypto_blk_dev(const std::string& dm_name, uint64_t nr_sec,
}
std::string hex_key(hex_key_buffer.data(), hex_key_buffer.size());
DmTable table;
table.Emplace<DmTargetDefaultKey>(0, nr_sec, "AES-256-XTS", hex_key, real_blkdev, 0, set_dun);
bool set_dun = android::base::GetBoolProperty("ro.crypto.set_dun", false);
if (!set_dun && data_rec->fs_mgr_flags.checkpoint_blk) {
LOG(ERROR) << "Block checkpoints and metadata encryption require ro.crypto.set_dun option";
return false;
}
DmTable table;
table.Emplace<DmTargetDefaultKey>(0, nr_sec, "AES-256-XTS", hex_key, data_rec->blk_device, 0,
set_dun);
auto& dm = DeviceMapper::Instance();
for (int i = 0;; i++) {
if (dm.CreateDevice(dm_name, table)) {
break;
}
if (i + 1 >= TABLE_LOAD_RETRIES) {
LOG(ERROR) << "Could not create default-key device " << dm_name;
PLOG(ERROR) << "Could not create default-key device " << dm_name;
return false;
}
PLOG(INFO) << "Could not create default-key device, retrying";
@ -198,25 +206,24 @@ bool fscrypt_mount_metadata_encrypted(const std::string& blk_device, const std::
auto data_rec = GetEntryForMountPoint(&fstab_default, mount_point);
if (!data_rec) {
LOG(ERROR) << "Failed to get data_rec";
LOG(ERROR) << "Failed to get data_rec for " << mount_point;
return false;
}
if (blk_device != data_rec->blk_device) {
LOG(ERROR) << "blk_device " << blk_device << " does not match fstab entry "
<< data_rec->blk_device << " for " << mount_point;
return false;
}
KeyBuffer key;
if (!read_key(*data_rec, needs_encrypt, &key)) return false;
uint64_t nr_sec;
if (!get_number_of_sectors(data_rec->blk_device, &nr_sec)) return false;
bool set_dun = android::base::GetBoolProperty("ro.crypto.set_dun", false);
if (!set_dun && data_rec->fs_mgr_flags.checkpoint_blk) {
LOG(ERROR) << "Block checkpoints and metadata encryption require setdun option!";
return false;
}
std::string crypto_blkdev;
if (!create_crypto_blk_dev(kDmNameUserdata, nr_sec, blk_device, key, &crypto_blkdev, set_dun))
return false;
if (!create_crypto_blk_dev(kDmNameUserdata, data_rec, key, &crypto_blkdev)) return false;
// FIXME handle the corrupt case
if (needs_encrypt) {
uint64_t nr_sec;
if (!get_number_of_sectors(data_rec->blk_device, &nr_sec)) return false;
LOG(INFO) << "Beginning inplace encryption, nr_sec: " << nr_sec;
off64_t size_already_done = 0;
auto rc = cryptfs_enable_inplace(crypto_blkdev.data(), blk_device.data(), nr_sec,