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/*
* Copyright (c) 2012 Isode Limited, London, England.
* Licensed under the simplified BSD license.
* See Documentation/Licenses/BSD-simplified.txt for more information.
*/
#pragma once
#include <Swiften/Base/SafeByteArray.h>
#include <Swiften/TLS/CertificateWithKey.h>
#include <boost/algorithm/string/predicate.hpp>
#define SECURITY_WIN32
#include <WinCrypt.h>
namespace Swift {
class CAPICertificate : public Swift::CertificateWithKey {
public:
CAPICertificate(const std::string& capiUri)
: valid_(false), uri_(capiUri), cert_store_handle_(0), cert_store_(NULL), cert_name_(NULL) {
setUri(capiUri);
}
virtual ~CAPICertificate() {
if (cert_store_handle_ != NULL)
{
CertCloseStore(cert_store_handle_, 0);
}
}
virtual bool isNull() const {
return uri_.empty() || !valid_;
}
virtual bool isPrivateKeyExportable() const {
/* We can check with CAPI, but for now the answer is "no" */
return false;
}
virtual const std::string& getCertStoreName() const {
return cert_store_;
}
virtual const std::string& getCertName() const {
return cert_name_;
}
const ByteArray& getData() const {
////Might need to throw an exception here, or really generate PKCS12 blob from CAPI data?
assert(0);
}
void setData(const ByteArray& data) {
assert(0);
}
const SafeByteArray& getPassword() const {
/////Can't pass NULL to createSafeByteArray!
/////Should this throw an exception instead?
return createSafeByteArray("");
}
protected:
void setUri (const std::string& capiUri) {
valid_ = false;
/* Syntax: "certstore:" [<cert_store> ":"] <cert_id> */
if (!boost::iequals(capiUri.substr(0, 10), "certstore:")) {
return;
}
/* Substring of subject: uses "storename" */
std::string capi_identity = capiUri.substr(10);
std::string new_cert_store_name;
size_t pos = capi_identity.find_first_of (':');
if (pos == std::string::npos) {
/* Using the default certificate store */
new_cert_store_name = "MY";
cert_name_ = capi_identity;
} else {
new_cert_store_name = capi_identity.substr(0, pos);
cert_name_ = capi_identity.substr(pos + 1);
}
PCCERT_CONTEXT pCertContext = NULL;
if (cert_store_handle_ != NULL)
{
if (new_cert_store_name != cert_store_) {
CertCloseStore(cert_store_handle_, 0);
cert_store_handle_ = NULL;
}
}
if (cert_store_handle_ == NULL)
{
cert_store_handle_ = CertOpenSystemStore(0, cert_store_.c_str());
if (!cert_store_handle_)
{
return;
}
}
cert_store_ = new_cert_store_name;
/* NB: This might have to change, depending on how we locate certificates */
// Find client certificate. Note that this sample just searches for a
// certificate that contains the user name somewhere in the subject name.
pCertContext = CertFindCertificateInStore(cert_store_handle_,
X509_ASN_ENCODING,
0, // dwFindFlags
CERT_FIND_SUBJECT_STR_A,
cert_name_.c_str(), // *pvFindPara
NULL ); // pPrevCertContext
if (pCertContext == NULL)
{
return;
}
/* Now verify that we can have access to the corresponding private key */
DWORD len;
CRYPT_KEY_PROV_INFO *pinfo;
HCRYPTPROV hprov;
HCRYPTKEY key;
if (!CertGetCertificateContextProperty(pCertContext,
CERT_KEY_PROV_INFO_PROP_ID,
NULL,
&len))
{
CertFreeCertificateContext(pCertContext);
return;
}
pinfo = static_cast<CRYPT_KEY_PROV_INFO *>(malloc(len));
if (!pinfo) {
CertFreeCertificateContext(pCertContext);
return;
}
if (!CertGetCertificateContextProperty(pCertContext,
CERT_KEY_PROV_INFO_PROP_ID,
pinfo,
&len))
{
CertFreeCertificateContext(pCertContext);
free(pinfo);
return;
}
CertFreeCertificateContext(pCertContext);
// Now verify if we have access to the private key
if (!CryptAcquireContextW(&hprov,
pinfo->pwszContainerName,
pinfo->pwszProvName,
pinfo->dwProvType,
0))
{
free(pinfo);
return;
}
if (!CryptGetUserKey(hprov, pinfo->dwKeySpec, &key))
{
CryptReleaseContext(hprov, 0);
free(pinfo);
return;
}
CryptDestroyKey(key);
CryptReleaseContext(hprov, 0);
free(pinfo);
valid_ = true;
}
private:
bool valid_;
std::string uri_;
HCERTSTORE cert_store_handle_;
/* Parsed components of the uri_ */
std::string cert_store_;
std::string cert_name_;
};
}
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Swift