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Use new libfscrypt interface 

Bug: 143307095
Test: treehugger
Change-Id: Icc97ff5b32e8d291a75c62640b4d9b8e4f64de09
This commit is contained in:
Paul Crowley 2019-10-24 14:53:48 -07:00
parent d1a6d75d29
commit 9107e6f4f1
1 changed files with 9 additions and 36 deletions
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45
init/fscrypt_init_extensions.cpp
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@ -39,6 +39,8 @@
#define TAG "fscrypt"
using namespace android::fscrypt;
static int set_policy_on(const std::string& ref_basename, const std::string& dir);
int fscrypt_install_keyring() {
@ -164,32 +166,12 @@ int fscrypt_set_directory_policy(const std::string& dir) {
return err;
}
static int parse_encryption_options_string(const std::string& options_string,
std::string* contents_mode_ret,
std::string* filenames_mode_ret,
int* policy_version_ret) {
auto parts = android::base::Split(options_string, ":");
if (parts.size() != 3) {
return -1;
}
*contents_mode_ret = parts[0];
*filenames_mode_ret = parts[1];
if (!android::base::StartsWith(parts[2], 'v') ||
!android::base::ParseInt(&parts[2][1], policy_version_ret)) {
return -1;
}
return 0;
}
// Set an encryption policy on the given directory. The policy (key reference
// and encryption options) to use is read from files that were written by vold.
static int set_policy_on(const std::string& ref_basename, const std::string& dir) {
EncryptionPolicy policy;
std::string ref_filename = std::string("/data") + ref_basename;
std::string key_ref;
if (!android::base::ReadFileToString(ref_filename, &key_ref)) {
if (!android::base::ReadFileToString(ref_filename, &policy.key_raw_ref)) {
LOG(ERROR) << "Unable to read system policy to set on " << dir;
return -1;
}
@ -200,24 +182,15 @@ static int set_policy_on(const std::string& ref_basename, const std::string& dir
LOG(ERROR) << "Cannot read encryption options string";
return -1;
}
std::string contents_mode;
std::string filenames_mode;
int policy_version = 0;
if (parse_encryption_options_string(options_string, &contents_mode, &filenames_mode,
&policy_version)) {
if (!ParseOptions(options_string, &policy.options)) {
LOG(ERROR) << "Invalid encryption options string: " << options_string;
return -1;
}
int result =
fscrypt_policy_ensure(dir.c_str(), key_ref.c_str(), key_ref.length(),
contents_mode.c_str(), filenames_mode.c_str(), policy_version);
if (result) {
LOG(ERROR) << android::base::StringPrintf("Setting %02x%02x%02x%02x policy on %s failed!",
key_ref[0], key_ref[1], key_ref[2], key_ref[3],
dir.c_str());
if (!EnsurePolicy(policy, dir)) {
std::string ref_hex;
BytesToHex(policy.key_raw_ref, &ref_hex);
LOG(ERROR) << "Setting " << ref_hex << " policy on " << dir << " failed!";
return -1;
}