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// Copyright 2013 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 "remoting/host/token_validator_factory_impl.h"
#include <set>
#include "base/base64.h"
#include "base/bind.h"
#include "base/callback.h"
#include "base/json/json_reader.h"
#include "base/location.h"
#include "base/logging.h"
#include "base/single_thread_task_runner.h"
#include "base/strings/string_util.h"
#include "base/values.h"
#include "crypto/random.h"
#include "net/base/escape.h"
#include "net/url_request/url_fetcher.h"
#include "net/url_request/url_fetcher_delegate.h"
#include "net/url_request/url_request_status.h"
#include "remoting/base/rsa_key_pair.h"
#include "url/gurl.h"
namespace {
// Length in bytes of the cryptographic nonce used to salt the token scope.
const size_t kNonceLength = 16; // 128 bits.
}
namespace remoting {
class TokenValidatorImpl
: public net::URLFetcherDelegate,
public protocol::ThirdPartyHostAuthenticator::TokenValidator {
public:
TokenValidatorImpl(
const GURL& token_url,
const GURL& token_validation_url,
scoped_refptr<RsaKeyPair> key_pair,
const std::string& local_jid,
const std::string& remote_jid,
scoped_refptr<net::URLRequestContextGetter> request_context_getter)
: token_url_(token_url),
token_validation_url_(token_validation_url),
key_pair_(key_pair),
request_context_getter_(request_context_getter) {
DCHECK(token_url_.is_valid());
DCHECK(token_validation_url_.is_valid());
DCHECK(key_pair_.get());
token_scope_ = CreateScope(local_jid, remote_jid);
}
virtual ~TokenValidatorImpl() {
}
// TokenValidator interface.
virtual void ValidateThirdPartyToken(
const std::string& token,
const base::Callback<void(
const std::string& shared_secret)>& on_token_validated) OVERRIDE {
DCHECK(!request_);
DCHECK(!on_token_validated.is_null());
on_token_validated_ = on_token_validated;
std::string post_body =
"code=" + net::EscapeUrlEncodedData(token, true) +
"&client_id=" + net::EscapeUrlEncodedData(
key_pair_->GetPublicKey(), true) +
"&client_secret=" + net::EscapeUrlEncodedData(
key_pair_->SignMessage(token), true) +
"&grant_type=authorization_code";
request_.reset(net::URLFetcher::Create(
0, token_validation_url_, net::URLFetcher::POST, this));
request_->SetUploadData("application/x-www-form-urlencoded", post_body);
request_->SetRequestContext(request_context_getter_.get());
request_->Start();
}
virtual const GURL& token_url() const OVERRIDE {
return token_url_;
}
virtual const std::string& token_scope() const OVERRIDE {
return token_scope_;
}
// URLFetcherDelegate interface.
virtual void OnURLFetchComplete(const net::URLFetcher* source) OVERRIDE {
DCHECK_EQ(request_.get(), source);
std::string shared_token = ProcessResponse();
request_.reset();
on_token_validated_.Run(shared_token);
}
private:
bool IsValidScope(const std::string& token_scope) {
// TODO(rmsousa): Deal with reordering/subsets/supersets/aliases/etc.
return token_scope == token_scope_;
}
static std::string CreateScope(const std::string& local_jid,
const std::string& remote_jid) {
std::string nonce_bytes;
crypto::RandBytes(WriteInto(&nonce_bytes, kNonceLength + 1), kNonceLength);
std::string nonce;
base::Base64Encode(nonce_bytes, &nonce);
return "client:" + remote_jid + " host:" + local_jid + " nonce:" + nonce;
}
std::string ProcessResponse() {
// Verify that we got a successful response.
net::URLRequestStatus status = request_->GetStatus();
if (!status.is_success()) {
LOG(ERROR) << "Error validating token, status=" << status.status()
<< " err=" << status.error();
return std::string();
}
int response = request_->GetResponseCode();
std::string data;
request_->GetResponseAsString(&data);
if (response != 200) {
LOG(ERROR)
<< "Error " << response << " validating token: '" << data << "'";
return std::string();
}
// Decode the JSON data from the response.
scoped_ptr<base::Value> value(base::JSONReader::Read(data));
DictionaryValue* dict;
if (!value.get() || value->GetType() != base::Value::TYPE_DICTIONARY ||
!value->GetAsDictionary(&dict)) {
LOG(ERROR) << "Invalid token validation response: '" << data << "'";
return std::string();
}
std::string token_scope;
dict->GetStringWithoutPathExpansion("scope", &token_scope);
if (!IsValidScope(token_scope)) {
LOG(ERROR) << "Invalid scope: '" << token_scope
<< "', expected: '" << token_scope_ <<"'.";
return std::string();
}
std::string shared_secret;
// Everything is valid, so return the shared secret to the caller.
dict->GetStringWithoutPathExpansion("access_token", &shared_secret);
return shared_secret;
}
scoped_ptr<net::URLFetcher> request_;
GURL token_url_;
GURL token_validation_url_;
scoped_refptr<RsaKeyPair> key_pair_;
std::string token_scope_;
scoped_refptr<net::URLRequestContextGetter> request_context_getter_;
base::Callback<void(const std::string& shared_secret)> on_token_validated_;
DISALLOW_COPY_AND_ASSIGN(TokenValidatorImpl);
};
TokenValidatorFactoryImpl::TokenValidatorFactoryImpl(
const GURL& token_url,
const GURL& token_validation_url,
scoped_refptr<RsaKeyPair> key_pair,
scoped_refptr<net::URLRequestContextGetter> request_context_getter)
: token_url_(token_url),
token_validation_url_(token_validation_url),
key_pair_(key_pair),
request_context_getter_(request_context_getter) {
}
TokenValidatorFactoryImpl::~TokenValidatorFactoryImpl() {
}
scoped_ptr<protocol::ThirdPartyHostAuthenticator::TokenValidator>
TokenValidatorFactoryImpl::CreateTokenValidator(
const std::string& local_jid,
const std::string& remote_jid) {
return scoped_ptr<protocol::ThirdPartyHostAuthenticator::TokenValidator>(
new TokenValidatorImpl(token_url_, token_validation_url_, key_pair_,
local_jid, remote_jid,
request_context_getter_));
}
} // namespace remoting
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