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// Copyright 2023 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "components/os_crypt/async/common/encryptor_mojom_traits.h"
#include <algorithm>
#include <map>
#include <optional>
#include <string>
#include <vector>
#include "components/os_crypt/async/common/algorithm.mojom.h"
#include "components/os_crypt/async/common/encryptor.h"
#include "components/os_crypt/async/common/encryptor.mojom.h"
#include "mojo/public/cpp/bindings/struct_traits.h"
#if BUILDFLAG(IS_WIN)
#include <windows.h>
#include <dpapi.h>
#include "base/feature_list.h"
#endif
namespace mojo {
// static
bool StructTraits<os_crypt_async::mojom::EncryptorDataView,
os_crypt_async::Encryptor>::
Read(os_crypt_async::mojom::EncryptorDataView data,
os_crypt_async::Encryptor* out) {
if (!data.ReadProviderForEncryption(&out->provider_for_encryption_)) {
return false;
}
if (!data.ReadKeyEntries(&out->keys_)) {
return false;
}
return true;
}
// static
const std::string& StructTraits<os_crypt_async::mojom::EncryptorDataView,
os_crypt_async::Encryptor>::
provider_for_encryption(const os_crypt_async::Encryptor& in) {
return in.provider_for_encryption_;
}
// static
const std::map<std::string, std::optional<os_crypt_async::Encryptor::Key>>&
StructTraits<os_crypt_async::mojom::EncryptorDataView,
os_crypt_async::Encryptor>::
key_entries(const os_crypt_async::Encryptor& in) {
return in.keys_;
}
// static
bool StructTraits<os_crypt_async::mojom::KeyDataView,
os_crypt_async::Encryptor::Key>::
Read(os_crypt_async::mojom::KeyDataView data,
os_crypt_async::Encryptor::Key* out) {
std::optional<size_t> key_size;
switch (data.algorithm()) {
case os_crypt_async::mojom::Algorithm::kAES256GCM:
key_size.emplace(os_crypt_async::Encryptor::Key::kAES256GCMKeySize);
break;
case os_crypt_async::mojom::Algorithm::kAES128CBC:
key_size.emplace(os_crypt_async::Encryptor::Key::kAES128CBCKeySize);
break;
}
if (!key_size.has_value()) {
return false;
}
// Using shared memory here means that the key never transits any mojo
// buffers, but is completely controlled by the traits.
base::UnsafeSharedMemoryRegion key_memory;
if (!data.ReadKey(&key_memory)) {
return false;
}
if (key_memory.GetSize() != *key_size) {
return false;
}
out->key_.resize(*key_size);
auto mapping = key_memory.Map();
if (!mapping.IsValid()) {
return false;
}
auto memory_span = mapping.GetMemoryAsSpan<uint8_t>();
std::copy(memory_span.begin(), memory_span.end(), out->key_.begin());
#if BUILDFLAG(IS_WIN)
SecureZeroMemory(std::data(memory_span), std::size(memory_span));
out->encrypted_ =
::CryptProtectMemory(std::data(out->key_), std::size(out->key_),
CRYPTPROTECTMEMORY_SAME_PROCESS);
#endif // BUILDFLAG(IS_WIN)
out->algorithm_ = data.algorithm();
return true;
}
// static
const os_crypt_async::mojom::Algorithm&
StructTraits<os_crypt_async::mojom::KeyDataView,
os_crypt_async::Encryptor::Key>::
algorithm(const os_crypt_async::Encryptor::Key& in) {
if (in.algorithm_) {
return *in.algorithm_;
}
NOTREACHED();
}
// static
base::UnsafeSharedMemoryRegion StructTraits<os_crypt_async::mojom::KeyDataView,
os_crypt_async::Encryptor::Key>::
key(const os_crypt_async::Encryptor::Key& in) {
auto region = base::UnsafeSharedMemoryRegion::Create(in.key_.size());
auto mapping = region.Map();
auto memory_span = mapping.GetMemoryAsSpan<uint8_t>();
memory_span.copy_from(in.key_);
#if BUILDFLAG(IS_WIN)
if (in.encrypted_) {
// Not much we can do if this fails.
std::ignore =
::CryptUnprotectMemory(std::data(memory_span), std::size(memory_span),
CRYPTPROTECTMEMORY_SAME_PROCESS);
}
#endif // BUILDFLAG(IS_WIN)
return region;
}
} // namespace mojo
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