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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 "net/ssl/client_cert_store_nss.h"
#include <nss.h>
#include <ssl.h>
#include "base/bind.h"
#include "base/location.h"
#include "base/logging.h"
#include "base/memory/scoped_ptr.h"
#include "base/threading/worker_pool.h"
#include "crypto/nss_crypto_module_delegate.h"
#include "net/cert/x509_util.h"
namespace net {
namespace {
// Examines the certificates in |cert_list| to find all certificates that match
// the client certificate request in |request|, storing the matching
// certificates in |selected_certs|.
// If |query_nssdb| is true, NSS will be queried to construct full certificate
// chains. If it is false, only the certificate will be considered.
void GetClientCertsImpl(CERTCertList* cert_list,
const SSLCertRequestInfo& request,
bool query_nssdb,
CertificateList* selected_certs) {
DCHECK(cert_list);
DCHECK(selected_certs);
selected_certs->clear();
// Create a "fake" CERTDistNames structure. No public API exists to create
// one from a list of issuers.
CERTDistNames ca_names;
ca_names.arena = NULL;
ca_names.nnames = 0;
ca_names.names = NULL;
ca_names.head = NULL;
std::vector<SECItem> ca_names_items(request.cert_authorities.size());
for (size_t i = 0; i < request.cert_authorities.size(); ++i) {
const std::string& authority = request.cert_authorities[i];
ca_names_items[i].type = siBuffer;
ca_names_items[i].data =
reinterpret_cast<unsigned char*>(const_cast<char*>(authority.data()));
ca_names_items[i].len = static_cast<unsigned int>(authority.size());
}
ca_names.nnames = static_cast<int>(ca_names_items.size());
if (!ca_names_items.empty())
ca_names.names = &ca_names_items[0];
for (CERTCertListNode* node = CERT_LIST_HEAD(cert_list);
!CERT_LIST_END(node, cert_list);
node = CERT_LIST_NEXT(node)) {
// Only offer unexpired certificates.
if (CERT_CheckCertValidTimes(node->cert, PR_Now(), PR_TRUE) !=
secCertTimeValid) {
continue;
}
scoped_refptr<X509Certificate> cert = X509Certificate::CreateFromHandle(
node->cert, X509Certificate::OSCertHandles());
// Check if the certificate issuer is allowed by the server.
if (request.cert_authorities.empty() ||
(!query_nssdb &&
cert->IsIssuedByEncoded(request.cert_authorities)) ||
(query_nssdb &&
NSS_CmpCertChainWCANames(node->cert, &ca_names) == SECSuccess)) {
selected_certs->push_back(cert);
}
}
std::sort(selected_certs->begin(), selected_certs->end(),
x509_util::ClientCertSorter());
}
void GetClientCertsOnWorkerThread(
scoped_ptr<crypto::CryptoModuleBlockingPasswordDelegate> password_delegate,
const SSLCertRequestInfo* request,
CertificateList* selected_certs) {
CERTCertList* client_certs = CERT_FindUserCertsByUsage(
CERT_GetDefaultCertDB(),
certUsageSSLClient,
PR_FALSE,
PR_FALSE,
password_delegate.get());
// It is ok for a user not to have any client certs.
if (!client_certs) {
selected_certs->clear();
return;
}
GetClientCertsImpl(client_certs, *request, true, selected_certs);
CERT_DestroyCertList(client_certs);
}
} // namespace
ClientCertStoreNSS::ClientCertStoreNSS(
const PasswordDelegateFactory& password_delegate_factory)
: password_delegate_factory_(password_delegate_factory) {}
ClientCertStoreNSS::~ClientCertStoreNSS() {}
void ClientCertStoreNSS::GetClientCerts(const SSLCertRequestInfo& request,
CertificateList* selected_certs,
const base::Closure& callback) {
scoped_ptr<crypto::CryptoModuleBlockingPasswordDelegate> password_delegate;
if (!password_delegate_factory_.is_null()) {
password_delegate.reset(
password_delegate_factory_.Run(request.host_and_port));
}
if (!base::WorkerPool::PostTaskAndReply(
FROM_HERE,
base::Bind(&GetClientCertsOnWorkerThread,
base::Passed(&password_delegate),
&request,
selected_certs),
callback,
true)) {
selected_certs->clear();
callback.Run();
}
}
bool ClientCertStoreNSS::SelectClientCertsForTesting(
const CertificateList& input_certs,
const SSLCertRequestInfo& request,
CertificateList* selected_certs) {
CERTCertList* cert_list = CERT_NewCertList();
if (!cert_list)
return false;
for (size_t i = 0; i < input_certs.size(); ++i) {
CERT_AddCertToListTail(
cert_list, CERT_DupCertificate(input_certs[i]->os_cert_handle()));
}
GetClientCertsImpl(cert_list, request, false, selected_certs);
CERT_DestroyCertList(cert_list);
return true;
}
} // namespace net
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