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libdm: Redact keys from dm-crypt targets when calling GetTable.

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Ignore-AOSP-First: security fix
Bug: 368069390
Test: libdm_test
Change-Id: I40b9a0129e58b1a0f116ca29f0ee66f91a27a73d
Merged-In: I40b9a0129e58b1a0f116ca29f0ee66f91a27a73d
This commit is contained in:
David Anderson 2024-10-01 11:01:08 -07:00
parent 555d2393b6
commit e68f6cd6c0
2 changed files with 43 additions and 0 deletions
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14
fs_mgr/libdm/dm.cpp
View file

@ -512,6 +512,17 @@ bool DeviceMapper::GetTableInfo(const std::string& name, std::vector<TargetInfo>
return GetTable(name, DM_STATUS_TABLE_FLAG, table);
}
void RedactTableInfo(const struct dm_target_spec& spec, std::string* data) {
if (DeviceMapper::GetTargetType(spec) == "crypt") {
auto parts = android::base::Split(*data, " ");
if (parts.size() < 2) {
return;
}
parts[1] = "redacted";
*data = android::base::Join(parts, " ");
}
}
// private methods of DeviceMapper
bool DeviceMapper::GetTable(const std::string& name, uint32_t flags,
std::vector<TargetInfo>* table) {
@ -550,6 +561,9 @@ bool DeviceMapper::GetTable(const std::string& name, uint32_t flags,
// Note: we use c_str() to eliminate any extra trailing 0s.
data = std::string(&buffer[data_offset], next_cursor - data_offset).c_str();
}
if (flags & DM_STATUS_TABLE_FLAG) {
RedactTableInfo(*spec, &data);
}
table->emplace_back(*spec, data);
cursor = next_cursor;
}

29
fs_mgr/libdm/dm_test.cpp
View file

@ -690,3 +690,32 @@ TEST(libdm, CreateEmptyDevice) {
// Empty device should be in suspended state.
ASSERT_EQ(DmDeviceState::SUSPENDED, dm.GetState("empty-device"));
}
TEST(libdm, RedactDmCrypt) {
static constexpr uint64_t kImageSize = 65536;
static constexpr const char* kTestName = "RedactDmCrypt";
unique_fd temp_file(CreateTempFile("file_1", kImageSize));
ASSERT_GE(temp_file, 0);
LoopDevice loop(temp_file, 10s);
ASSERT_TRUE(loop.valid());
static constexpr const char* kAlgorithm = "aes-cbc-essiv:sha256";
static constexpr const char* kKey = "0e64ef514e6a1315b1f6390cb57c9e6a";
auto target = std::make_unique<DmTargetCrypt>(0, kImageSize / 512, kAlgorithm, kKey, 0,
loop.device(), 0);
target->AllowDiscards();
DmTable table;
table.AddTarget(std::move(target));
auto& dm = DeviceMapper::Instance();
std::string crypt_path;
ASSERT_TRUE(dm.CreateDevice(kTestName, table, &crypt_path, 10s));
std::vector<DeviceMapper::TargetInfo> targets;
ASSERT_TRUE(dm.GetTableInfo(kTestName, &targets));
ASSERT_EQ(targets.size(), 1);
EXPECT_EQ(targets[0].data.find(kKey), std::string::npos);
}