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// Copyright (c) 2010 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/base/cert_database.h"
#include <windows.h>
#include <wincrypt.h>
#pragma comment(lib, "crypt32.lib")
#include "base/logging.h"
#include "base/string_util.h"
#include "net/base/keygen_handler.h"
#include "net/base/net_errors.h"
#include "net/base/x509_certificate.h"
namespace net {
namespace {
// Returns an encoded version of SubjectPublicKeyInfo from |cert| that is
// compatible with KeygenHandler::Cache. If the cert cannot be converted, an
// empty string is returned.
std::string GetSubjectPublicKeyInfo(const X509Certificate* cert) {
DCHECK(cert);
std::string result;
if (!cert->os_cert_handle() || !cert->os_cert_handle()->pCertInfo)
return result;
BOOL ok;
DWORD size = 0;
PCERT_PUBLIC_KEY_INFO key_info =
&(cert->os_cert_handle()->pCertInfo->SubjectPublicKeyInfo);
ok = CryptEncodeObject(X509_ASN_ENCODING, X509_PUBLIC_KEY_INFO, key_info,
NULL, &size);
if (!ok)
return result;
ok = CryptEncodeObject(X509_ASN_ENCODING, X509_PUBLIC_KEY_INFO, key_info,
reinterpret_cast<BYTE*>(WriteInto(&result, size + 1)),
&size);
if (!ok) {
result.clear();
return result;
}
// Per MSDN, the resultant structure may be smaller than the original size
// supplied, so shrink to the actual size output.
result.resize(size);
return result;
}
// Returns true if |cert| was successfully modified to reference |location| to
// obtain the associated private key.
bool LinkCertToPrivateKey(X509Certificate* cert,
KeygenHandler::KeyLocation location) {
DCHECK(cert);
CRYPT_KEY_PROV_INFO prov_info = { 0 };
prov_info.pwszContainerName =
const_cast<LPWSTR>(location.container_name.c_str());
prov_info.pwszProvName =
const_cast<LPWSTR>(location.provider_name.c_str());
// Implicit by it being from KeygenHandler, which only supports RSA keys.
prov_info.dwProvType = PROV_RSA_FULL;
prov_info.dwKeySpec = AT_KEYEXCHANGE;
BOOL ok = CertSetCertificateContextProperty(cert->os_cert_handle(),
CERT_KEY_PROV_INFO_PROP_ID, 0,
&prov_info);
return ok != FALSE;
}
} // namespace
CertDatabase::CertDatabase() {
}
int CertDatabase::CheckUserCert(X509Certificate* cert) {
if (!cert)
return ERR_CERT_INVALID;
if (cert->HasExpired())
return ERR_CERT_DATE_INVALID;
std::string encoded_info = GetSubjectPublicKeyInfo(cert);
KeygenHandler::Cache* cache = KeygenHandler::Cache::GetInstance();
KeygenHandler::KeyLocation location;
if (encoded_info.empty() || !cache->Find(encoded_info, &location) ||
!LinkCertToPrivateKey(cert, location))
return ERR_NO_PRIVATE_KEY_FOR_CERT;
return OK;
}
int CertDatabase::AddUserCert(X509Certificate* cert) {
// TODO(rsleevi): Would it be more appropriate to have the CertDatabase take
// construction parameters (Keychain filepath on Mac OS X, PKCS #11 slot on
// NSS, and Store Type / Path) here? For now, certs will be stashed into the
// user's personal store, which will not automatically mark them as trusted,
// but will allow them to be used for client auth.
HCERTSTORE cert_db = CertOpenSystemStore(NULL, L"MY");
if (!cert_db)
return ERR_ADD_USER_CERT_FAILED;
BOOL added = CertAddCertificateContextToStore(cert_db,
cert->os_cert_handle(),
CERT_STORE_ADD_USE_EXISTING,
NULL);
CertCloseStore(cert_db, 0);
if (!added)
return ERR_ADD_USER_CERT_FAILED;
return OK;
}
} // namespace net
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