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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 "chromeos/network/onc/onc_certificate_importer_impl.h"
#include <cert.h>
#include <keyhi.h>
#include <pk11pub.h>
#include "base/base64.h"
#include "base/bind.h"
#include "base/bind_helpers.h"
#include "base/callback.h"
#include "base/location.h"
#include "base/logging.h"
#include "base/sequenced_task_runner.h"
#include "base/single_thread_task_runner.h"
#include "base/thread_task_runner_handle.h"
#include "base/values.h"
#include "chromeos/network/network_event_log.h"
#include "chromeos/network/onc/onc_utils.h"
#include "components/onc/onc_constants.h"
#include "crypto/scoped_nss_types.h"
#include "net/base/crypto_module.h"
#include "net/base/net_errors.h"
#include "net/cert/nss_cert_database.h"
#include "net/cert/x509_certificate.h"
namespace chromeos {
namespace onc {
namespace {
void CallBackOnOriginLoop(
const scoped_refptr<base::SingleThreadTaskRunner>& origin_loop,
const CertificateImporter::DoneCallback& callback,
bool success,
const net::CertificateList& onc_trusted_certificates) {
origin_loop->PostTask(
FROM_HERE, base::Bind(callback, success, onc_trusted_certificates));
}
} // namespace
CertificateImporterImpl::CertificateImporterImpl(
const scoped_refptr<base::SequencedTaskRunner>& io_task_runner,
net::NSSCertDatabase* target_nssdb)
: io_task_runner_(io_task_runner),
target_nssdb_(target_nssdb),
weak_factory_(this) {
CHECK(target_nssdb);
}
CertificateImporterImpl::~CertificateImporterImpl() {
}
void CertificateImporterImpl::ImportCertificates(
const base::ListValue& certificates,
::onc::ONCSource source,
const DoneCallback& done_callback) {
VLOG(2) << "ONC file has " << certificates.GetSize() << " certificates";
// |done_callback| must only be called as long as |this| still exists.
// Thereforce, call back to |this|. This check of |this| must happen last and
// on the origin thread.
DoneCallback callback_to_this =
base::Bind(&CertificateImporterImpl::RunDoneCallback,
weak_factory_.GetWeakPtr(),
done_callback);
// |done_callback| must be called on the origin thread.
DoneCallback callback_on_origin_loop =
base::Bind(&CallBackOnOriginLoop,
base::ThreadTaskRunnerHandle::Get(),
callback_to_this);
// This is the actual function that imports the certificates.
base::Closure import_certs_callback =
base::Bind(&ParseAndStoreCertificates,
source,
callback_on_origin_loop,
base::Owned(certificates.DeepCopy()),
target_nssdb_);
// The NSSCertDatabase must be accessed on |io_task_runner_|
io_task_runner_->PostTask(FROM_HERE, import_certs_callback);
}
// static
void CertificateImporterImpl::ParseAndStoreCertificates(
::onc::ONCSource source,
const DoneCallback& done_callback,
base::ListValue* certificates,
net::NSSCertDatabase* nssdb) {
// Web trust is only granted to certificates imported by the user.
bool allow_trust_imports = source == ::onc::ONC_SOURCE_USER_IMPORT;
net::CertificateList onc_trusted_certificates;
bool success = true;
for (size_t i = 0; i < certificates->GetSize(); ++i) {
const base::DictionaryValue* certificate = NULL;
certificates->GetDictionary(i, &certificate);
DCHECK(certificate != NULL);
VLOG(2) << "Parsing certificate at index " << i << ": " << *certificate;
if (!ParseAndStoreCertificate(allow_trust_imports,
*certificate,
nssdb,
&onc_trusted_certificates)) {
success = false;
LOG(ERROR) << "Cannot parse certificate at index " << i;
} else {
VLOG(2) << "Successfully imported certificate at index " << i;
}
}
done_callback.Run(success, onc_trusted_certificates);
}
// static
void CertificateImporterImpl::ListCertsWithNickname(
const std::string& label,
net::CertificateList* result,
net::NSSCertDatabase* target_nssdb) {
net::CertificateList all_certs;
// TODO(tbarzic): Use async |ListCerts|.
target_nssdb->ListCertsSync(&all_certs);
result->clear();
for (net::CertificateList::iterator iter = all_certs.begin();
iter != all_certs.end(); ++iter) {
if (iter->get()->os_cert_handle()->nickname) {
// Separate the nickname stored in the certificate at the colon, since
// NSS likes to store it as token:nickname.
const char* delimiter =
::strchr(iter->get()->os_cert_handle()->nickname, ':');
if (delimiter) {
++delimiter; // move past the colon.
if (strcmp(delimiter, label.c_str()) == 0) {
result->push_back(*iter);
continue;
}
}
}
// Now we find the private key for this certificate and see if it has a
// nickname that matches. If there is a private key, and it matches,
// then this is a client cert that we are looking for.
SECKEYPrivateKey* private_key = PK11_FindPrivateKeyFromCert(
iter->get()->os_cert_handle()->slot,
iter->get()->os_cert_handle(),
NULL); // wincx
if (private_key) {
char* private_key_nickname = PK11_GetPrivateKeyNickname(private_key);
if (private_key_nickname && std::string(label) == private_key_nickname)
result->push_back(*iter);
PORT_Free(private_key_nickname);
SECKEY_DestroyPrivateKey(private_key);
}
}
}
// static
bool CertificateImporterImpl::DeleteCertAndKeyByNickname(
const std::string& label,
net::NSSCertDatabase* target_nssdb) {
net::CertificateList cert_list;
ListCertsWithNickname(label, &cert_list, target_nssdb);
bool result = true;
for (net::CertificateList::iterator iter = cert_list.begin();
iter != cert_list.end(); ++iter) {
// If we fail, we try and delete the rest still.
// TODO(gspencer): this isn't very "transactional". If we fail on some, but
// not all, then it's possible to leave things in a weird state.
// Luckily there should only be one cert with a particular
// label, and the cert not being found is one of the few reasons the
// delete could fail, but still... The other choice is to return
// failure immediately, but that doesn't seem to do what is intended.
if (!target_nssdb->DeleteCertAndKey(iter->get()))
result = false;
}
return result;
}
void CertificateImporterImpl::RunDoneCallback(
const CertificateImporter::DoneCallback& callback,
bool success,
const net::CertificateList& onc_trusted_certificates) {
if (!success)
NET_LOG_ERROR("ONC Certificate Import Error", "");
callback.Run(success, onc_trusted_certificates);
}
bool CertificateImporterImpl::ParseAndStoreCertificate(
bool allow_trust_imports,
const base::DictionaryValue& certificate,
net::NSSCertDatabase* nssdb,
net::CertificateList* onc_trusted_certificates) {
// Get out the attributes of the given certificate.
std::string guid;
certificate.GetStringWithoutPathExpansion(::onc::certificate::kGUID, &guid);
DCHECK(!guid.empty());
bool remove = false;
if (certificate.GetBooleanWithoutPathExpansion(::onc::kRemove, &remove) &&
remove) {
if (!DeleteCertAndKeyByNickname(guid, nssdb)) {
LOG(ERROR) << "Unable to delete certificate";
return false;
} else {
return true;
}
}
// Not removing, so let's get the data we need to add this certificate.
std::string cert_type;
certificate.GetStringWithoutPathExpansion(::onc::certificate::kType,
&cert_type);
if (cert_type == ::onc::certificate::kServer ||
cert_type == ::onc::certificate::kAuthority) {
return ParseServerOrCaCertificate(allow_trust_imports,
cert_type,
guid,
certificate,
nssdb,
onc_trusted_certificates);
} else if (cert_type == ::onc::certificate::kClient) {
return ParseClientCertificate(guid, certificate, nssdb);
}
NOTREACHED();
return false;
}
bool CertificateImporterImpl::ParseServerOrCaCertificate(
bool allow_trust_imports,
const std::string& cert_type,
const std::string& guid,
const base::DictionaryValue& certificate,
net::NSSCertDatabase* nssdb,
net::CertificateList* onc_trusted_certificates) {
bool web_trust_flag = false;
const base::ListValue* trust_list = NULL;
if (certificate.GetListWithoutPathExpansion(::onc::certificate::kTrustBits,
&trust_list)) {
for (base::ListValue::const_iterator it = trust_list->begin();
it != trust_list->end(); ++it) {
std::string trust_type;
if (!(*it)->GetAsString(&trust_type))
NOTREACHED();
if (trust_type == ::onc::certificate::kWeb) {
// "Web" implies that the certificate is to be trusted for SSL
// identification.
web_trust_flag = true;
} else {
// Trust bits should only increase trust and never restrict. Thus,
// ignoring unknown bits should be safe.
LOG(WARNING) << "Certificate contains unknown trust type "
<< trust_type;
}
}
}
bool import_with_ssl_trust = false;
if (web_trust_flag) {
if (!allow_trust_imports)
LOG(WARNING) << "Web trust not granted for certificate: " << guid;
else
import_with_ssl_trust = true;
}
std::string x509_data;
if (!certificate.GetStringWithoutPathExpansion(::onc::certificate::kX509,
&x509_data) ||
x509_data.empty()) {
LOG(ERROR) << "Certificate missing appropriate certificate data for type: "
<< cert_type;
return false;
}
scoped_refptr<net::X509Certificate> x509_cert =
DecodePEMCertificate(x509_data);
if (!x509_cert.get()) {
LOG(ERROR) << "Unable to create certificate from PEM encoding, type: "
<< cert_type;
return false;
}
net::NSSCertDatabase::TrustBits trust = (import_with_ssl_trust ?
net::NSSCertDatabase::TRUSTED_SSL :
net::NSSCertDatabase::TRUST_DEFAULT);
if (x509_cert->os_cert_handle()->isperm) {
net::CertType net_cert_type =
cert_type == ::onc::certificate::kServer ? net::SERVER_CERT
: net::CA_CERT;
VLOG(1) << "Certificate is already installed.";
net::NSSCertDatabase::TrustBits missing_trust_bits =
trust & ~nssdb->GetCertTrust(x509_cert.get(), net_cert_type);
if (missing_trust_bits) {
std::string error_reason;
bool success = false;
if (nssdb->IsReadOnly(x509_cert.get())) {
error_reason = " Certificate is stored read-only.";
} else {
success = nssdb->SetCertTrust(x509_cert.get(), net_cert_type, trust);
}
if (!success) {
LOG(ERROR) << "Certificate of type " << cert_type
<< " was already present, but trust couldn't be set."
<< error_reason;
}
}
} else {
net::CertificateList cert_list;
cert_list.push_back(x509_cert);
net::NSSCertDatabase::ImportCertFailureList failures;
bool success = false;
if (cert_type == ::onc::certificate::kServer)
success = nssdb->ImportServerCert(cert_list, trust, &failures);
else // Authority cert
success = nssdb->ImportCACerts(cert_list, trust, &failures);
if (!failures.empty()) {
std::string error_string = net::ErrorToString(failures[0].net_error);
LOG(ERROR) << "Error ( " << error_string
<< " ) importing certificate of type " << cert_type;
return false;
}
if (!success) {
LOG(ERROR) << "Unknown error importing " << cert_type << " certificate.";
return false;
}
}
if (web_trust_flag && onc_trusted_certificates)
onc_trusted_certificates->push_back(x509_cert);
return true;
}
bool CertificateImporterImpl::ParseClientCertificate(
const std::string& guid,
const base::DictionaryValue& certificate,
net::NSSCertDatabase* nssdb) {
std::string pkcs12_data;
if (!certificate.GetStringWithoutPathExpansion(::onc::certificate::kPKCS12,
&pkcs12_data) ||
pkcs12_data.empty()) {
LOG(ERROR) << "PKCS12 data is missing for client certificate.";
return false;
}
std::string decoded_pkcs12;
if (!base::Base64Decode(pkcs12_data, &decoded_pkcs12)) {
LOG(ERROR) << "Unable to base64 decode PKCS#12 data: \"" << pkcs12_data
<< "\".";
return false;
}
// Since this has a private key, always use the private module.
crypto::ScopedPK11Slot private_slot(nssdb->GetPrivateSlot());
if (!private_slot)
return false;
scoped_refptr<net::CryptoModule> module(
net::CryptoModule::CreateFromHandle(private_slot.get()));
net::CertificateList imported_certs;
int import_result = nssdb->ImportFromPKCS12(
module.get(), decoded_pkcs12, base::string16(), false, &imported_certs);
if (import_result != net::OK) {
std::string error_string = net::ErrorToString(import_result);
LOG(ERROR) << "Unable to import client certificate, error: "
<< error_string;
return false;
}
if (imported_certs.size() == 0) {
LOG(WARNING) << "PKCS12 data contains no importable certificates.";
return true;
}
if (imported_certs.size() != 1) {
LOG(WARNING) << "ONC File: PKCS12 data contains more than one certificate. "
"Only the first one will be imported.";
}
scoped_refptr<net::X509Certificate> cert_result = imported_certs[0];
// Find the private key associated with this certificate, and set the
// nickname on it.
SECKEYPrivateKey* private_key = PK11_FindPrivateKeyFromCert(
cert_result->os_cert_handle()->slot,
cert_result->os_cert_handle(),
NULL); // wincx
if (private_key) {
PK11_SetPrivateKeyNickname(private_key, const_cast<char*>(guid.c_str()));
SECKEY_DestroyPrivateKey(private_key);
} else {
LOG(WARNING) << "Unable to find private key for certificate.";
}
return true;
}
} // namespace onc
} // namespace chromeos
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