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|
// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "content/child/webcrypto/webcrypto_impl.h"
#include "base/bind.h"
#include "base/lazy_instance.h"
#include "base/location.h"
#include "base/logging.h"
#include "base/memory/scoped_ptr.h"
#include "base/single_thread_task_runner.h"
#include "base/stl_util.h"
#include "base/task_runner.h"
#include "base/thread_task_runner_handle.h"
#include "base/threading/sequenced_worker_pool.h"
#include "base/threading/worker_pool.h"
#include "content/child/webcrypto/algorithm_dispatch.h"
#include "content/child/webcrypto/crypto_data.h"
#include "content/child/webcrypto/generate_key_result.h"
#include "content/child/webcrypto/status.h"
#include "content/child/webcrypto/webcrypto_util.h"
#include "content/child/worker_thread_task_runner.h"
#include "third_party/WebKit/public/platform/WebCryptoKeyAlgorithm.h"
#include "third_party/WebKit/public/platform/WebString.h"
namespace content {
using webcrypto::Status;
namespace {
// ---------------------
// Threading
// ---------------------
//
// WebCrypto operations can be slow. For instance generating an RSA key can
// seconds.
//
// Moreover the underlying crypto libraries are not threadsafe when operating
// on the same key.
//
// The strategy used here is to run a sequenced worker pool for all WebCrypto
// operations (except structured cloning). This same pool is also used by
// requests started from Blink Web Workers.
//
// A few notes to keep in mind:
//
// * PostTaskAndReply() cannot be used for two reasons:
//
// (1) Blink web worker threads do not have an associated message loop so
// construction of the reply callback will crash.
//
// (2) PostTaskAndReply() handles failure posting the reply by leaking the
// callback, rather than destroying it. In the case of Web Workers this
// condition is reachable via normal execution, since Web Workers can
// be stopped before the WebCrypto operation has finished. A policy of
// leaking would therefore be problematic.
//
// * blink::WebArrayBuffer is NOT threadsafe, and should therefore be allocated
// on the target Blink thread.
//
// TODO(eroman): Is there any way around this? Copying the result between
// threads is silly.
//
// * WebCryptoAlgorithm and WebCryptoKey are threadsafe (however the key's
// handle(), which wraps an NSS/OpenSSL type, may not be and should only be
// used from the webcrypto thread).
//
// * blink::WebCryptoResult is not threadsafe and should only be operated on
// the target Blink thread. HOWEVER, it is safe to delete it from any thread.
// This can happen if by the time the operation has completed in the crypto
// worker pool, the Blink worker thread that initiated the request is gone.
// Posting back to the origin thread will fail, and the WebCryptoResult will
// be deleted while running in the crypto worker pool.
class CryptoThreadPool {
public:
CryptoThreadPool()
: worker_pool_(new base::SequencedWorkerPool(1, "WebCrypto")),
task_runner_(worker_pool_->GetSequencedTaskRunnerWithShutdownBehavior(
worker_pool_->GetSequenceToken(),
base::SequencedWorkerPool::CONTINUE_ON_SHUTDOWN)) {}
static bool PostTask(const tracked_objects::Location& from_here,
const base::Closure& task);
private:
scoped_refptr<base::SequencedWorkerPool> worker_pool_;
scoped_refptr<base::SequencedTaskRunner> task_runner_;
};
base::LazyInstance<CryptoThreadPool>::Leaky crypto_thread_pool =
LAZY_INSTANCE_INITIALIZER;
bool CryptoThreadPool::PostTask(const tracked_objects::Location& from_here,
const base::Closure& task) {
return crypto_thread_pool.Get().task_runner_->PostTask(from_here, task);
}
void CompleteWithThreadPoolError(blink::WebCryptoResult* result) {
result->completeWithError(blink::WebCryptoErrorTypeOperation,
"Failed posting to crypto worker pool");
}
void CompleteWithError(const Status& status, blink::WebCryptoResult* result) {
DCHECK(status.IsError());
result->completeWithError(status.error_type(),
blink::WebString::fromUTF8(status.error_details()));
}
void CompleteWithBufferOrError(const Status& status,
const std::vector<uint8_t>& buffer,
blink::WebCryptoResult* result) {
if (status.IsError()) {
CompleteWithError(status, result);
} else {
if (buffer.size() > UINT_MAX) {
// WebArrayBuffers have a smaller range than std::vector<>, so
// theoretically this could overflow.
CompleteWithError(Status::ErrorUnexpected(), result);
} else {
result->completeWithBuffer(vector_as_array(&buffer), buffer.size());
}
}
}
void CompleteWithKeyOrError(const Status& status,
const blink::WebCryptoKey& key,
blink::WebCryptoResult* result) {
if (status.IsError()) {
CompleteWithError(status, result);
} else {
result->completeWithKey(key);
}
}
// Gets a task runner for the current thread. The current thread is either:
//
// * The main Blink thread
// * A Blink web worker thread
//
// A different mechanism is needed for posting to these threads. The main
// thread has an associated message loop and can simply use
// base::ThreadTaskRunnerHandle. Whereas the web worker threads are managed by
// Blink and need to be indirected through WorkerThreadTaskRunner.
scoped_refptr<base::TaskRunner> GetCurrentBlinkThread() {
if (base::ThreadTaskRunnerHandle::IsSet())
return base::ThreadTaskRunnerHandle::Get();
return WorkerThreadTaskRunner::current();
}
// --------------------------------------------------------------------
// State
// --------------------------------------------------------------------
//
// Explicit state classes are used rather than base::Bind(). This is done
// both for clarity, but also to avoid extraneous allocations for things
// like passing buffers and result objects between threads.
//
// BaseState is the base class common to all of the async operations, and
// keeps track of the thread to complete on, the error state, and the
// callback into Blink.
//
// Ownership of the State object is passed between the crypto thread and the
// Blink thread. Under normal completion it is destroyed on the Blink thread.
// However it may also be destroyed on the crypto thread if the Blink thread
// has vanished (which can happen for Blink web worker threads).
struct BaseState {
explicit BaseState(const blink::WebCryptoResult& result)
: origin_thread(GetCurrentBlinkThread()), result(result) {}
bool cancelled() {
return result.cancelled();
}
scoped_refptr<base::TaskRunner> origin_thread;
webcrypto::Status status;
blink::WebCryptoResult result;
protected:
// Since there is no virtual destructor, must not delete directly as a
// BaseState.
~BaseState() {}
};
struct EncryptState : public BaseState {
EncryptState(const blink::WebCryptoAlgorithm& algorithm,
const blink::WebCryptoKey& key,
const unsigned char* data,
unsigned int data_size,
const blink::WebCryptoResult& result)
: BaseState(result),
algorithm(algorithm),
key(key),
data(data, data + data_size) {}
const blink::WebCryptoAlgorithm algorithm;
const blink::WebCryptoKey key;
const std::vector<uint8_t> data;
std::vector<uint8_t> buffer;
};
typedef EncryptState DecryptState;
typedef EncryptState DigestState;
struct GenerateKeyState : public BaseState {
GenerateKeyState(const blink::WebCryptoAlgorithm& algorithm,
bool extractable,
blink::WebCryptoKeyUsageMask usages,
const blink::WebCryptoResult& result)
: BaseState(result),
algorithm(algorithm),
extractable(extractable),
usages(usages) {}
const blink::WebCryptoAlgorithm algorithm;
const bool extractable;
const blink::WebCryptoKeyUsageMask usages;
webcrypto::GenerateKeyResult generate_key_result;
};
struct ImportKeyState : public BaseState {
ImportKeyState(blink::WebCryptoKeyFormat format,
const unsigned char* key_data,
unsigned int key_data_size,
const blink::WebCryptoAlgorithm& algorithm,
bool extractable,
blink::WebCryptoKeyUsageMask usages,
const blink::WebCryptoResult& result)
: BaseState(result),
format(format),
key_data(key_data, key_data + key_data_size),
algorithm(algorithm),
extractable(extractable),
usages(usages) {}
const blink::WebCryptoKeyFormat format;
const std::vector<uint8_t> key_data;
const blink::WebCryptoAlgorithm algorithm;
const bool extractable;
const blink::WebCryptoKeyUsageMask usages;
blink::WebCryptoKey key;
};
struct ExportKeyState : public BaseState {
ExportKeyState(blink::WebCryptoKeyFormat format,
const blink::WebCryptoKey& key,
const blink::WebCryptoResult& result)
: BaseState(result), format(format), key(key) {}
const blink::WebCryptoKeyFormat format;
const blink::WebCryptoKey key;
std::vector<uint8_t> buffer;
};
typedef EncryptState SignState;
struct VerifySignatureState : public BaseState {
VerifySignatureState(const blink::WebCryptoAlgorithm& algorithm,
const blink::WebCryptoKey& key,
const unsigned char* signature,
unsigned int signature_size,
const unsigned char* data,
unsigned int data_size,
const blink::WebCryptoResult& result)
: BaseState(result),
algorithm(algorithm),
key(key),
signature(signature, signature + signature_size),
data(data, data + data_size),
verify_result(false) {}
const blink::WebCryptoAlgorithm algorithm;
const blink::WebCryptoKey key;
const std::vector<uint8_t> signature;
const std::vector<uint8_t> data;
bool verify_result;
};
struct WrapKeyState : public BaseState {
WrapKeyState(blink::WebCryptoKeyFormat format,
const blink::WebCryptoKey& key,
const blink::WebCryptoKey& wrapping_key,
const blink::WebCryptoAlgorithm& wrap_algorithm,
const blink::WebCryptoResult& result)
: BaseState(result),
format(format),
key(key),
wrapping_key(wrapping_key),
wrap_algorithm(wrap_algorithm) {}
const blink::WebCryptoKeyFormat format;
const blink::WebCryptoKey key;
const blink::WebCryptoKey wrapping_key;
const blink::WebCryptoAlgorithm wrap_algorithm;
std::vector<uint8_t> buffer;
};
struct UnwrapKeyState : public BaseState {
UnwrapKeyState(blink::WebCryptoKeyFormat format,
const unsigned char* wrapped_key,
unsigned wrapped_key_size,
const blink::WebCryptoKey& wrapping_key,
const blink::WebCryptoAlgorithm& unwrap_algorithm,
const blink::WebCryptoAlgorithm& unwrapped_key_algorithm,
bool extractable,
blink::WebCryptoKeyUsageMask usages,
const blink::WebCryptoResult& result)
: BaseState(result),
format(format),
wrapped_key(wrapped_key, wrapped_key + wrapped_key_size),
wrapping_key(wrapping_key),
unwrap_algorithm(unwrap_algorithm),
unwrapped_key_algorithm(unwrapped_key_algorithm),
extractable(extractable),
usages(usages) {}
const blink::WebCryptoKeyFormat format;
const std::vector<uint8_t> wrapped_key;
const blink::WebCryptoKey wrapping_key;
const blink::WebCryptoAlgorithm unwrap_algorithm;
const blink::WebCryptoAlgorithm unwrapped_key_algorithm;
const bool extractable;
const blink::WebCryptoKeyUsageMask usages;
blink::WebCryptoKey unwrapped_key;
};
// --------------------------------------------------------------------
// Wrapper functions
// --------------------------------------------------------------------
//
// * The methods named Do*() run on the crypto thread.
// * The methods named Do*Reply() run on the target Blink thread
void DoEncryptReply(scoped_ptr<EncryptState> state) {
CompleteWithBufferOrError(state->status, state->buffer, &state->result);
}
void DoEncrypt(scoped_ptr<EncryptState> passed_state) {
EncryptState* state = passed_state.get();
if (state->cancelled())
return;
state->status = webcrypto::Encrypt(state->algorithm,
state->key,
webcrypto::CryptoData(state->data),
&state->buffer);
state->origin_thread->PostTask(
FROM_HERE, base::Bind(DoEncryptReply, Passed(&passed_state)));
}
void DoDecryptReply(scoped_ptr<DecryptState> state) {
CompleteWithBufferOrError(state->status, state->buffer, &state->result);
}
void DoDecrypt(scoped_ptr<DecryptState> passed_state) {
DecryptState* state = passed_state.get();
if (state->cancelled())
return;
state->status = webcrypto::Decrypt(state->algorithm,
state->key,
webcrypto::CryptoData(state->data),
&state->buffer);
state->origin_thread->PostTask(
FROM_HERE, base::Bind(DoDecryptReply, Passed(&passed_state)));
}
void DoDigestReply(scoped_ptr<DigestState> state) {
CompleteWithBufferOrError(state->status, state->buffer, &state->result);
}
void DoDigest(scoped_ptr<DigestState> passed_state) {
DigestState* state = passed_state.get();
if (state->cancelled())
return;
state->status = webcrypto::Digest(
state->algorithm, webcrypto::CryptoData(state->data), &state->buffer);
state->origin_thread->PostTask(
FROM_HERE, base::Bind(DoDigestReply, Passed(&passed_state)));
}
void DoGenerateKeyReply(scoped_ptr<GenerateKeyState> state) {
if (state->status.IsError()) {
CompleteWithError(state->status, &state->result);
} else {
state->generate_key_result.Complete(&state->result);
}
}
void DoGenerateKey(scoped_ptr<GenerateKeyState> passed_state) {
GenerateKeyState* state = passed_state.get();
if (state->cancelled())
return;
state->status = webcrypto::GenerateKey(state->algorithm,
state->extractable,
state->usages,
&state->generate_key_result);
state->origin_thread->PostTask(
FROM_HERE, base::Bind(DoGenerateKeyReply, Passed(&passed_state)));
}
void DoImportKeyReply(scoped_ptr<ImportKeyState> state) {
CompleteWithKeyOrError(state->status, state->key, &state->result);
}
void DoImportKey(scoped_ptr<ImportKeyState> passed_state) {
ImportKeyState* state = passed_state.get();
if (state->cancelled())
return;
state->status = webcrypto::ImportKey(state->format,
webcrypto::CryptoData(state->key_data),
state->algorithm,
state->extractable,
state->usages,
&state->key);
if (state->status.IsSuccess()) {
DCHECK(state->key.handle());
DCHECK(!state->key.algorithm().isNull());
DCHECK_EQ(state->extractable, state->key.extractable());
}
state->origin_thread->PostTask(
FROM_HERE, base::Bind(DoImportKeyReply, Passed(&passed_state)));
}
void DoExportKeyReply(scoped_ptr<ExportKeyState> state) {
if (state->format != blink::WebCryptoKeyFormatJwk) {
CompleteWithBufferOrError(state->status, state->buffer, &state->result);
return;
}
if (state->status.IsError()) {
CompleteWithError(state->status, &state->result);
} else {
state->result.completeWithJson(
reinterpret_cast<const char*>(vector_as_array(&state->buffer)),
state->buffer.size());
}
}
void DoExportKey(scoped_ptr<ExportKeyState> passed_state) {
ExportKeyState* state = passed_state.get();
if (state->cancelled())
return;
state->status =
webcrypto::ExportKey(state->format, state->key, &state->buffer);
state->origin_thread->PostTask(
FROM_HERE, base::Bind(DoExportKeyReply, Passed(&passed_state)));
}
void DoSignReply(scoped_ptr<SignState> state) {
CompleteWithBufferOrError(state->status, state->buffer, &state->result);
}
void DoSign(scoped_ptr<SignState> passed_state) {
SignState* state = passed_state.get();
if (state->cancelled())
return;
state->status = webcrypto::Sign(state->algorithm,
state->key,
webcrypto::CryptoData(state->data),
&state->buffer);
state->origin_thread->PostTask(
FROM_HERE, base::Bind(DoSignReply, Passed(&passed_state)));
}
void DoVerifyReply(scoped_ptr<VerifySignatureState> state) {
if (state->status.IsError()) {
CompleteWithError(state->status, &state->result);
} else {
state->result.completeWithBoolean(state->verify_result);
}
}
void DoVerify(scoped_ptr<VerifySignatureState> passed_state) {
VerifySignatureState* state = passed_state.get();
if (state->cancelled())
return;
state->status = webcrypto::Verify(state->algorithm,
state->key,
webcrypto::CryptoData(state->signature),
webcrypto::CryptoData(state->data),
&state->verify_result);
state->origin_thread->PostTask(
FROM_HERE, base::Bind(DoVerifyReply, Passed(&passed_state)));
}
void DoWrapKeyReply(scoped_ptr<WrapKeyState> state) {
CompleteWithBufferOrError(state->status, state->buffer, &state->result);
}
void DoWrapKey(scoped_ptr<WrapKeyState> passed_state) {
WrapKeyState* state = passed_state.get();
if (state->cancelled())
return;
state->status = webcrypto::WrapKey(state->format,
state->key,
state->wrapping_key,
state->wrap_algorithm,
&state->buffer);
state->origin_thread->PostTask(
FROM_HERE, base::Bind(DoWrapKeyReply, Passed(&passed_state)));
}
void DoUnwrapKeyReply(scoped_ptr<UnwrapKeyState> state) {
CompleteWithKeyOrError(state->status, state->unwrapped_key, &state->result);
}
void DoUnwrapKey(scoped_ptr<UnwrapKeyState> passed_state) {
UnwrapKeyState* state = passed_state.get();
if (state->cancelled())
return;
state->status =
webcrypto::UnwrapKey(state->format,
webcrypto::CryptoData(state->wrapped_key),
state->wrapping_key,
state->unwrap_algorithm,
state->unwrapped_key_algorithm,
state->extractable,
state->usages,
&state->unwrapped_key);
state->origin_thread->PostTask(
FROM_HERE, base::Bind(DoUnwrapKeyReply, Passed(&passed_state)));
}
} // namespace
WebCryptoImpl::WebCryptoImpl() {
}
WebCryptoImpl::~WebCryptoImpl() {
}
void WebCryptoImpl::encrypt(const blink::WebCryptoAlgorithm& algorithm,
const blink::WebCryptoKey& key,
const unsigned char* data,
unsigned int data_size,
blink::WebCryptoResult result) {
DCHECK(!algorithm.isNull());
scoped_ptr<EncryptState> state(
new EncryptState(algorithm, key, data, data_size, result));
if (!CryptoThreadPool::PostTask(FROM_HERE,
base::Bind(DoEncrypt, Passed(&state)))) {
CompleteWithThreadPoolError(&result);
}
}
void WebCryptoImpl::decrypt(const blink::WebCryptoAlgorithm& algorithm,
const blink::WebCryptoKey& key,
const unsigned char* data,
unsigned int data_size,
blink::WebCryptoResult result) {
DCHECK(!algorithm.isNull());
scoped_ptr<DecryptState> state(
new DecryptState(algorithm, key, data, data_size, result));
if (!CryptoThreadPool::PostTask(FROM_HERE,
base::Bind(DoDecrypt, Passed(&state)))) {
CompleteWithThreadPoolError(&result);
}
}
void WebCryptoImpl::digest(const blink::WebCryptoAlgorithm& algorithm,
const unsigned char* data,
unsigned int data_size,
blink::WebCryptoResult result) {
DCHECK(!algorithm.isNull());
scoped_ptr<DigestState> state(new DigestState(
algorithm, blink::WebCryptoKey::createNull(), data, data_size, result));
if (!CryptoThreadPool::PostTask(FROM_HERE,
base::Bind(DoDigest, Passed(&state)))) {
CompleteWithThreadPoolError(&result);
}
}
void WebCryptoImpl::generateKey(const blink::WebCryptoAlgorithm& algorithm,
bool extractable,
blink::WebCryptoKeyUsageMask usages,
blink::WebCryptoResult result) {
DCHECK(!algorithm.isNull());
scoped_ptr<GenerateKeyState> state(
new GenerateKeyState(algorithm, extractable, usages, result));
if (!CryptoThreadPool::PostTask(FROM_HERE,
base::Bind(DoGenerateKey, Passed(&state)))) {
CompleteWithThreadPoolError(&result);
}
}
void WebCryptoImpl::importKey(blink::WebCryptoKeyFormat format,
const unsigned char* key_data,
unsigned int key_data_size,
const blink::WebCryptoAlgorithm& algorithm,
bool extractable,
blink::WebCryptoKeyUsageMask usages,
blink::WebCryptoResult result) {
scoped_ptr<ImportKeyState> state(new ImportKeyState(
format, key_data, key_data_size, algorithm, extractable, usages, result));
if (!CryptoThreadPool::PostTask(FROM_HERE,
base::Bind(DoImportKey, Passed(&state)))) {
CompleteWithThreadPoolError(&result);
}
}
void WebCryptoImpl::exportKey(blink::WebCryptoKeyFormat format,
const blink::WebCryptoKey& key,
blink::WebCryptoResult result) {
scoped_ptr<ExportKeyState> state(new ExportKeyState(format, key, result));
if (!CryptoThreadPool::PostTask(FROM_HERE,
base::Bind(DoExportKey, Passed(&state)))) {
CompleteWithThreadPoolError(&result);
}
}
void WebCryptoImpl::sign(const blink::WebCryptoAlgorithm& algorithm,
const blink::WebCryptoKey& key,
const unsigned char* data,
unsigned int data_size,
blink::WebCryptoResult result) {
scoped_ptr<SignState> state(
new SignState(algorithm, key, data, data_size, result));
if (!CryptoThreadPool::PostTask(FROM_HERE,
base::Bind(DoSign, Passed(&state)))) {
CompleteWithThreadPoolError(&result);
}
}
void WebCryptoImpl::verifySignature(const blink::WebCryptoAlgorithm& algorithm,
const blink::WebCryptoKey& key,
const unsigned char* signature,
unsigned int signature_size,
const unsigned char* data,
unsigned int data_size,
blink::WebCryptoResult result) {
scoped_ptr<VerifySignatureState> state(new VerifySignatureState(
algorithm, key, signature, signature_size, data, data_size, result));
if (!CryptoThreadPool::PostTask(FROM_HERE,
base::Bind(DoVerify, Passed(&state)))) {
CompleteWithThreadPoolError(&result);
}
}
void WebCryptoImpl::wrapKey(blink::WebCryptoKeyFormat format,
const blink::WebCryptoKey& key,
const blink::WebCryptoKey& wrapping_key,
const blink::WebCryptoAlgorithm& wrap_algorithm,
blink::WebCryptoResult result) {
scoped_ptr<WrapKeyState> state(
new WrapKeyState(format, key, wrapping_key, wrap_algorithm, result));
if (!CryptoThreadPool::PostTask(FROM_HERE,
base::Bind(DoWrapKey, Passed(&state)))) {
CompleteWithThreadPoolError(&result);
}
}
void WebCryptoImpl::unwrapKey(
blink::WebCryptoKeyFormat format,
const unsigned char* wrapped_key,
unsigned wrapped_key_size,
const blink::WebCryptoKey& wrapping_key,
const blink::WebCryptoAlgorithm& unwrap_algorithm,
const blink::WebCryptoAlgorithm& unwrapped_key_algorithm,
bool extractable,
blink::WebCryptoKeyUsageMask usages,
blink::WebCryptoResult result) {
scoped_ptr<UnwrapKeyState> state(new UnwrapKeyState(format,
wrapped_key,
wrapped_key_size,
wrapping_key,
unwrap_algorithm,
unwrapped_key_algorithm,
extractable,
usages,
result));
if (!CryptoThreadPool::PostTask(FROM_HERE,
base::Bind(DoUnwrapKey, Passed(&state)))) {
CompleteWithThreadPoolError(&result);
}
}
blink::WebCryptoDigestor* WebCryptoImpl::createDigestor(
blink::WebCryptoAlgorithmId algorithm_id) {
return webcrypto::CreateDigestor(algorithm_id).release();
}
bool WebCryptoImpl::deserializeKeyForClone(
const blink::WebCryptoKeyAlgorithm& algorithm,
blink::WebCryptoKeyType type,
bool extractable,
blink::WebCryptoKeyUsageMask usages,
const unsigned char* key_data,
unsigned key_data_size,
blink::WebCryptoKey& key) {
return webcrypto::DeserializeKeyForClone(
algorithm,
type,
extractable,
usages,
webcrypto::CryptoData(key_data, key_data_size),
&key);
}
bool WebCryptoImpl::serializeKeyForClone(
const blink::WebCryptoKey& key,
blink::WebVector<unsigned char>& key_data) {
return webcrypto::SerializeKeyForClone(key, &key_data);
}
} // namespace content
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