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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/TLS/CAPICertificate.h>
#include <Swiften/StringCodecs/Hexify.h>
#include <boost/algorithm/string/predicate.hpp>
// Size of the SHA1 hash
#define SHA1_HASH_LEN 20
namespace Swift {
CAPICertificate::CAPICertificate(const std::string& capiUri)
: valid_(false), uri_(capiUri), certStoreHandle_(0), certStore_(), certName_() {
setUri(capiUri);
}
CAPICertificate::~CAPICertificate() {
if (certStoreHandle_) {
CertCloseStore(certStoreHandle_, 0);
}
}
bool CAPICertificate::isNull() const {
return uri_.empty() || !valid_;
}
const std::string& CAPICertificate::getCertStoreName() const {
return certStore_;
}
const std::string& CAPICertificate::getCertName() const {
return certName_;
}
static PCCERT_CONTEXT findCertificateInStore (HCERTSTORE certStoreHandle, const std::string &certName) {
PCCERT_CONTEXT pCertContext = NULL;
if (!boost::iequals(certName.substr(0, 5), "sha1:")) {
// Find client certificate. Note that this sample just searches for a
// certificate that contains the user name somewhere in the subject name.
pCertContext = CertFindCertificateInStore(certStoreHandle,
X509_ASN_ENCODING,
0, // dwFindFlags
CERT_FIND_SUBJECT_STR_A,
certName.c_str(), // *pvFindPara
NULL ); // pPrevCertContext
return pCertContext;
}
std::string hexstring = certName.substr(5);
ByteArray byteArray = Hexify::unhexify(hexstring);
CRYPT_HASH_BLOB HashBlob;
if (byteArray.size() != SHA1_HASH_LEN) {
return NULL;
}
HashBlob.cbData = SHA1_HASH_LEN;
HashBlob.pbData = static_cast<BYTE *>(vecptr(byteArray));
// Find client certificate. Note that this sample just searches for a
// certificate that contains the user name somewhere in the subject name.
pCertContext = CertFindCertificateInStore(certStoreHandle,
X509_ASN_ENCODING,
0, // dwFindFlags
CERT_FIND_HASH,
&HashBlob,
NULL ); // pPrevCertContext
return pCertContext;
}
void CAPICertificate::setUri (const std::string& capiUri) {
valid_ = false;
/* Syntax: "certstore:" <cert_store> ":" <hash> ":" <hash_of_cert> */
if (!boost::iequals(capiUri.substr(0, 10), "certstore:")) {
return;
}
/* Substring of subject: uses "storename" */
std::string capi_identity = capiUri.substr(10);
std::string new_certStore_name;
size_t pos = capi_identity.find_first_of (':');
if (pos == std::string::npos) {
/* Using the default certificate store */
new_certStore_name = "MY";
certName_ = capi_identity;
}
else {
new_certStore_name = capi_identity.substr(0, pos);
certName_ = capi_identity.substr(pos + 1);
}
PCCERT_CONTEXT pCertContext = NULL;
if (certStoreHandle_ != NULL) {
if (new_certStore_name != certStore_) {
CertCloseStore(certStoreHandle_, 0);
certStoreHandle_ = NULL;
}
}
if (certStoreHandle_ == NULL) {
certStoreHandle_ = CertOpenSystemStore(0, certStore_.c_str());
if (!certStoreHandle_) {
return;
}
}
certStore_ = new_certStore_name;
pCertContext = findCertificateInStore (certStoreHandle_, certName_);
if (!pCertContext) {
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;
}
}
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Swift