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/*
* Copyright (c) 2011 Soren Dreijer
* Licensed under the simplified BSD license.
* See Documentation/Licenses/BSD-simplified.txt for more information.
*/
#include "Swiften/TLS/Schannel/SchannelCertificate.h"
#include "Swiften/Base/ByteArray.h"
#define SECURITY_WIN32
#include <Windows.h>
#include <Schannel.h>
#include <security.h>
#include <schnlsp.h>
#include <Wincrypt.h>
using std::vector;
namespace Swift {
//------------------------------------------------------------------------
SchannelCertificate::SchannelCertificate(const ScopedCertContext& certCtxt)
: m_cert(certCtxt)
{
parse();
}
//------------------------------------------------------------------------
SchannelCertificate::SchannelCertificate(const ByteArray& der)
{
if (!der.empty())
{
// Convert the DER encoded certificate to a PCERT_CONTEXT
CERT_BLOB certBlob = {0};
certBlob.cbData = der.size();
certBlob.pbData = (BYTE*)&der[0];
if (!CryptQueryObject(
CERT_QUERY_OBJECT_BLOB,
&certBlob,
CERT_QUERY_CONTENT_FLAG_CERT,
CERT_QUERY_FORMAT_FLAG_ALL,
0,
NULL,
NULL,
NULL,
NULL,
NULL,
(const void**)m_cert.Reset()))
{
// TODO: Because Swiften isn't exception safe, we have no way to indicate failure
}
}
}
//------------------------------------------------------------------------
ByteArray SchannelCertificate::toDER() const
{
ByteArray result;
// Serialize the certificate. The CERT_CONTEXT is already DER encoded.
result.resize(m_cert->cbCertEncoded);
memcpy(&result[0], m_cert->pbCertEncoded, result.size());
return result;
}
//------------------------------------------------------------------------
std::string SchannelCertificate::wstrToStr(const std::wstring& wstr)
{
if (wstr.empty())
return "";
// First request the size of the required UTF-8 buffer
int numRequiredBytes = WideCharToMultiByte(CP_UTF8, 0, wstr.c_str(), wstr.size(), NULL, 0, NULL, NULL);
if (!numRequiredBytes)
return "";
// Allocate memory for the UTF-8 string
std::vector<char> utf8Str(numRequiredBytes);
int numConverted = WideCharToMultiByte(CP_UTF8, 0, wstr.c_str(), wstr.size(), &utf8Str[0], numRequiredBytes, NULL, NULL);
if (!numConverted)
return "";
std::string str(&utf8Str[0], numConverted);
return str;
}
//------------------------------------------------------------------------
void SchannelCertificate::parse()
{
//
// Subject name
//
DWORD requiredSize = CertNameToStr(X509_ASN_ENCODING, &m_cert->pCertInfo->Subject, CERT_OID_NAME_STR, NULL, 0);
if (requiredSize > 1)
{
vector<char> rawSubjectName(requiredSize);
CertNameToStr(X509_ASN_ENCODING, &m_cert->pCertInfo->Subject, CERT_OID_NAME_STR, &rawSubjectName[0], rawSubjectName.size());
m_subjectName = std::string(&rawSubjectName[0]);
}
//
// Common name
//
// Note: We only pull out one common name from the cert.
requiredSize = CertGetNameString(m_cert, CERT_NAME_ATTR_TYPE, 0, szOID_COMMON_NAME, NULL, 0);
if (requiredSize > 1)
{
vector<char> rawCommonName(requiredSize);
requiredSize = CertGetNameString(m_cert, CERT_NAME_ATTR_TYPE, 0, szOID_COMMON_NAME, &rawCommonName[0], rawCommonName.size());
m_commonNames.push_back( std::string(&rawCommonName[0]) );
}
//
// Subject alternative names
//
PCERT_EXTENSION pExtensions = CertFindExtension(szOID_SUBJECT_ALT_NAME2, m_cert->pCertInfo->cExtension, m_cert->pCertInfo->rgExtension);
if (pExtensions)
{
CRYPT_DECODE_PARA decodePara = {0};
decodePara.cbSize = sizeof(decodePara);
CERT_ALT_NAME_INFO* pAltNameInfo = NULL;
DWORD altNameInfoSize = 0;
BOOL status = CryptDecodeObjectEx(
X509_ASN_ENCODING | PKCS_7_ASN_ENCODING,
szOID_SUBJECT_ALT_NAME2,
pExtensions->Value.pbData,
pExtensions->Value.cbData,
CRYPT_DECODE_ALLOC_FLAG | CRYPT_DECODE_NOCOPY_FLAG,
&decodePara,
&pAltNameInfo,
&altNameInfoSize);
if (status && pAltNameInfo)
{
for (int i = 0; i < pAltNameInfo->cAltEntry; i++)
{
if (pAltNameInfo->rgAltEntry[i].dwAltNameChoice == CERT_ALT_NAME_DNS_NAME)
addDNSName( wstrToStr( pAltNameInfo->rgAltEntry[i].pwszDNSName ) );
}
}
}
// if (pExtensions)
// {
// vector<wchar_t> subjectAlt
// CryptDecodeObject(X509_ASN_ENCODING | PKCS_7_ASN_ENCODING, szOID_SUBJECT_ALT_NAME, pExtensions->Value->pbData, pExtensions->Value->cbData, )
// }
//
// // subjectAltNames
// int subjectAltNameLoc = X509_get_ext_by_NID(cert.get(), NID_subject_alt_name, -1);
// if(subjectAltNameLoc != -1) {
// X509_EXTENSION* extension = X509_get_ext(cert.get(), subjectAltNameLoc);
// boost::shared_ptr<GENERAL_NAMES> generalNames(reinterpret_cast<GENERAL_NAMES*>(X509V3_EXT_d2i(extension)), GENERAL_NAMES_free);
// boost::shared_ptr<ASN1_OBJECT> xmppAddrObject(OBJ_txt2obj(ID_ON_XMPPADDR_OID, 1), ASN1_OBJECT_free);
// boost::shared_ptr<ASN1_OBJECT> dnsSRVObject(OBJ_txt2obj(ID_ON_DNSSRV_OID, 1), ASN1_OBJECT_free);
// for (int i = 0; i < sk_GENERAL_NAME_num(generalNames.get()); ++i) {
// GENERAL_NAME* generalName = sk_GENERAL_NAME_value(generalNames.get(), i);
// if (generalName->type == GEN_OTHERNAME) {
// OTHERNAME* otherName = generalName->d.otherName;
// if (OBJ_cmp(otherName->type_id, xmppAddrObject.get()) == 0) {
// // XmppAddr
// if (otherName->value->type != V_ASN1_UTF8STRING) {
// continue;
// }
// ASN1_UTF8STRING* xmppAddrValue = otherName->value->value.utf8string;
// addXMPPAddress(ByteArray(ASN1_STRING_data(xmppAddrValue), ASN1_STRING_length(xmppAddrValue)).toString());
// }
// else if (OBJ_cmp(otherName->type_id, dnsSRVObject.get()) == 0) {
// // SRVName
// if (otherName->value->type != V_ASN1_IA5STRING) {
// continue;
// }
// ASN1_IA5STRING* srvNameValue = otherName->value->value.ia5string;
// addSRVName(ByteArray(ASN1_STRING_data(srvNameValue), ASN1_STRING_length(srvNameValue)).toString());
// }
// }
// else if (generalName->type == GEN_DNS) {
// // DNSName
// addDNSName(ByteArray(ASN1_STRING_data(generalName->d.dNSName), ASN1_STRING_length(generalName->d.dNSName)).toString());
// }
// }
// }
}
//------------------------------------------------------------------------
}
|
Swift