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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 "remoting/host/token_validator_base.h"
#include <stddef.h>
#include "base/base64.h"
#include "base/bind.h"
#include "base/callback.h"
#include "base/json/json_reader.h"
#include "base/logging.h"
#include "base/memory/weak_ptr.h"
#include "base/single_thread_task_runner.h"
#include "base/strings/string_util.h"
#include "base/values.h"
#include "build/build_config.h"
#include "net/base/escape.h"
#include "net/base/io_buffer.h"
#include "net/base/request_priority.h"
#include "net/base/upload_bytes_element_reader.h"
#include "net/base/upload_data_stream.h"
#include "net/ssl/client_cert_store.h"
#if defined(USE_NSS_CERTS)
#include "net/ssl/client_cert_store_nss.h"
#elif defined(OS_WIN)
#include "net/ssl/client_cert_store_win.h"
#elif defined(OS_MACOSX)
#include "net/ssl/client_cert_store_mac.h"
#endif
#include "net/ssl/ssl_cert_request_info.h"
#include "net/ssl/ssl_platform_key.h"
#include "net/ssl/ssl_private_key.h"
#include "net/url_request/redirect_info.h"
#include "net/url_request/url_request.h"
#include "net/url_request/url_request_context.h"
#include "net/url_request/url_request_status.h"
#include "url/gurl.h"
namespace {
const int kBufferSize = 4096;
const char kCertIssuerWildCard[] = "*";
} // namespace
namespace remoting {
TokenValidatorBase::TokenValidatorBase(
const ThirdPartyAuthConfig& third_party_auth_config,
const std::string& token_scope,
scoped_refptr<net::URLRequestContextGetter> request_context_getter)
: third_party_auth_config_(third_party_auth_config),
token_scope_(token_scope),
request_context_getter_(request_context_getter),
buffer_(new net::IOBuffer(kBufferSize)),
weak_factory_(this) {
DCHECK(third_party_auth_config_.token_url.is_valid());
DCHECK(third_party_auth_config_.token_validation_url.is_valid());
}
TokenValidatorBase::~TokenValidatorBase() {
}
// TokenValidator interface.
void TokenValidatorBase::ValidateThirdPartyToken(
const std::string& token,
const base::Callback<void(
const std::string& shared_secret)>& on_token_validated) {
DCHECK(!request_);
DCHECK(!on_token_validated.is_null());
on_token_validated_ = on_token_validated;
token_ = token;
StartValidateRequest(token);
}
const GURL& TokenValidatorBase::token_url() const {
return third_party_auth_config_.token_url;
}
const std::string& TokenValidatorBase::token_scope() const {
return token_scope_;
}
// URLFetcherDelegate interface.
void TokenValidatorBase::OnResponseStarted(net::URLRequest* source) {
DCHECK_EQ(request_.get(), source);
int bytes_read = 0;
request_->Read(buffer_.get(), kBufferSize, &bytes_read);
OnReadCompleted(request_.get(), bytes_read);
}
void TokenValidatorBase::OnReadCompleted(net::URLRequest* source,
int bytes_read) {
DCHECK_EQ(request_.get(), source);
do {
if (!request_->status().is_success() || bytes_read <= 0)
break;
data_.append(buffer_->data(), bytes_read);
} while (request_->Read(buffer_.get(), kBufferSize, &bytes_read));
const net::URLRequestStatus status = request_->status();
if (!status.is_io_pending()) {
retrying_request_ = false;
std::string shared_token = ProcessResponse();
request_.reset();
on_token_validated_.Run(shared_token);
}
}
void TokenValidatorBase::OnReceivedRedirect(
net::URLRequest* request,
const net::RedirectInfo& redirect_info,
bool* defer_redirect) {
if (!retrying_request_ && redirect_info.new_method == "GET" &&
redirect_info.new_url == third_party_auth_config_.token_validation_url) {
// A sequence of redirects caused the original POST request to become a GET
// request for this URL. Cancel the request, and re-submit the POST request.
// The chain of redirects are expected to set some cookies that will
// ensure the new POST request succeeds.
retrying_request_ = true;
DCHECK(data_.empty());
StartValidateRequest(token_);
}
}
void TokenValidatorBase::OnCertificateRequested(
net::URLRequest* source,
net::SSLCertRequestInfo* cert_request_info) {
DCHECK_EQ(request_.get(), source);
net::ClientCertStore* client_cert_store;
#if defined(USE_NSS_CERTS)
client_cert_store = new net::ClientCertStoreNSS(
net::ClientCertStoreNSS::PasswordDelegateFactory());
#elif defined(OS_WIN)
// The network process is running as "Local Service" whose "Current User"
// cert store doesn't contain any certificates. Use the "Local Machine"
// store instead.
// The ACL on the private key of the machine certificate in the "Local
// Machine" cert store needs to allow access by "Local Service".
HCERTSTORE cert_store = ::CertOpenStore(
CERT_STORE_PROV_SYSTEM, 0, NULL,
CERT_SYSTEM_STORE_LOCAL_MACHINE | CERT_STORE_READONLY_FLAG, L"MY");
client_cert_store = new net::ClientCertStoreWin(cert_store);
#elif defined(OS_MACOSX)
client_cert_store = new net::ClientCertStoreMac();
#elif defined(USE_OPENSSL)
// OpenSSL does not use the ClientCertStore infrastructure.
client_cert_store = nullptr;
#else
#error Unknown platform.
#endif
// The callback is uncancellable, and GetClientCert requires selected_certs
// and client_cert_store to stay alive until the callback is called. So we
// must give it a WeakPtr for |this|, and ownership of the other parameters.
net::CertificateList* selected_certs(new net::CertificateList());
client_cert_store->GetClientCerts(
*cert_request_info, selected_certs,
base::Bind(&TokenValidatorBase::OnCertificatesSelected,
weak_factory_.GetWeakPtr(), base::Owned(selected_certs),
base::Owned(client_cert_store)));
}
void TokenValidatorBase::OnCertificatesSelected(
net::CertificateList* selected_certs,
net::ClientCertStore* unused) {
const std::string& issuer =
third_party_auth_config_.token_validation_cert_issuer;
if (request_) {
for (size_t i = 0; i < selected_certs->size(); ++i) {
net::X509Certificate* cert = (*selected_certs)[i].get();
if (issuer == kCertIssuerWildCard ||
issuer == cert->issuer().common_name) {
request_->ContinueWithCertificate(
cert, net::FetchClientCertPrivateKey(cert).get());
return;
}
}
request_->ContinueWithCertificate(nullptr, nullptr);
}
}
bool TokenValidatorBase::IsValidScope(const std::string& token_scope) {
// TODO(rmsousa): Deal with reordering/subsets/supersets/aliases/etc.
return token_scope == token_scope_;
}
std::string TokenValidatorBase::ProcessResponse() {
// Verify that we got a successful response.
net::URLRequestStatus status = request_->status();
if (!status.is_success()) {
LOG(ERROR) << "Error validating token, status=" << status.status()
<< " err=" << status.error();
return std::string();
}
int response = request_->GetResponseCode();
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_);
base::DictionaryValue* dict;
if (!value || !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;
}
} // namespace remoting
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