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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 <algorithm>
#include <memory>
#include <utility>
#include "base/bind.h"
#include "base/bind_helpers.h"
#include "base/location.h"
#include "base/logging.h"
#include "base/strings/string_piece.h"
#include "base/threading/worker_pool.h"
#include "crypto/nss_crypto_module_delegate.h"
#include "net/cert/x509_util.h"
#include "net/ssl/ssl_cert_request_info.h"
namespace net {
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) {
std::unique_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(&ClientCertStoreNSS::GetAndFilterCertsOnWorkerThread,
// Caller is responsible for keeping the ClientCertStore
// alive until the callback is run.
base::Unretained(this), base::Passed(&password_delegate),
&request, selected_certs),
callback, true)) {
return;
}
// If the task could not be posted, behave as if there were no certificates
// which requires to clear |selected_certs|.
selected_certs->clear();
callback.Run();
}
// static
void ClientCertStoreNSS::FilterCertsOnWorkerThread(
const CertificateList& certs,
const SSLCertRequestInfo& request,
CertificateList* filtered_certs) {
DCHECK(filtered_certs);
filtered_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];
size_t num_raw = 0;
for (const auto& cert : certs) {
++num_raw;
X509Certificate::OSCertHandle handle = cert->os_cert_handle();
// Only offer unexpired certificates.
if (CERT_CheckCertValidTimes(handle, PR_Now(), PR_TRUE) !=
secCertTimeValid) {
DVLOG(2) << "skipped expired cert: "
<< base::StringPiece(handle->nickname);
continue;
}
// Check if the certificate issuer is allowed by the server.
if (!request.cert_authorities.empty() &&
NSS_CmpCertChainWCANames(handle, &ca_names) != SECSuccess) {
DVLOG(2) << "skipped non-matching cert: "
<< base::StringPiece(handle->nickname);
continue;
}
DVLOG(2) << "matched cert: " << base::StringPiece(handle->nickname);
filtered_certs->push_back(cert);
}
DVLOG(2) << "num_raw:" << num_raw
<< " num_filtered:" << filtered_certs->size();
std::sort(filtered_certs->begin(), filtered_certs->end(),
x509_util::ClientCertSorter());
}
void ClientCertStoreNSS::GetAndFilterCertsOnWorkerThread(
std::unique_ptr<crypto::CryptoModuleBlockingPasswordDelegate>
password_delegate,
const SSLCertRequestInfo* request,
CertificateList* selected_certs) {
CertificateList platform_certs;
GetPlatformCertsOnWorkerThread(std::move(password_delegate), &platform_certs);
FilterCertsOnWorkerThread(platform_certs, *request, selected_certs);
}
// static
void ClientCertStoreNSS::GetPlatformCertsOnWorkerThread(
std::unique_ptr<crypto::CryptoModuleBlockingPasswordDelegate>
password_delegate,
net::CertificateList* certs) {
CERTCertList* found_certs =
CERT_FindUserCertsByUsage(CERT_GetDefaultCertDB(), certUsageSSLClient,
PR_FALSE, PR_FALSE, password_delegate.get());
if (!found_certs) {
DVLOG(2) << "No client certs found.";
return;
}
for (CERTCertListNode* node = CERT_LIST_HEAD(found_certs);
!CERT_LIST_END(node, found_certs); node = CERT_LIST_NEXT(node)) {
certs->push_back(X509Certificate::CreateFromHandle(
node->cert, X509Certificate::OSCertHandles()));
}
CERT_DestroyCertList(found_certs);
}
} // namespace net
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