/***********************************************************************
* GetFriendlyNameOfCertA (CRYPTDLG.@)
*/
DWORD WINAPI GetFriendlyNameOfCertA(PCCERT_CONTEXT pccert, LPSTR pchBuffer,
DWORD cchBuffer)
{
return CertGetNameStringA(pccert, CERT_NAME_FRIENDLY_DISPLAY_TYPE, 0, NULL,
pchBuffer, cchBuffer);
}
/* Helper function to trace the signing cert to a trusted CA root
* in the Windows Certificate Store. */
static int checkCertCryptoAPI(const GTPublicationsFile *publications_file)
{
int res = GT_UNKNOWN_ERROR;
unsigned char *cert_der = NULL;
size_t cert_der_len;
PCCERT_CONTEXT pCertContext = NULL;
PCCERT_CHAIN_CONTEXT pChainContext = NULL;
CERT_ENHKEY_USAGE enhkeyUsage;
CERT_USAGE_MATCH certUsage;
CERT_CHAIN_PARA chainPara;
CERT_CHAIN_POLICY_PARA policyPara;
CERT_CHAIN_POLICY_STATUS policyStatus;
char tmp_name[256];
res = GTPublicationsFile_getSigningCert(publications_file, &cert_der, &cert_der_len);
if (res != GT_OK) {
goto cleanup;
}
/* Create a certificate context based on the above certificate. */
pCertContext = CertCreateCertificateContext(
X509_ASN_ENCODING | PKCS_7_ASN_ENCODING, cert_der, cert_der_len);
if (pCertContext == NULL) {
res = GT_CRYPTO_FAILURE;
goto cleanup;
}
#ifdef MAGIC_EMAIL
CertGetNameStringA(pCertContext, CERT_NAME_EMAIL_TYPE, 0, NULL,
tmp_name, sizeof(tmp_name));
if (strcmp(tmp_name, MAGIC_EMAIL) != 0) {
return GT_INVALID_SIGNATURE;
}
#endif
/* Get the certificate chain of our certificate. */
enhkeyUsage.cUsageIdentifier = 0;
enhkeyUsage.rgpszUsageIdentifier = NULL;
certUsage.dwType = USAGE_MATCH_TYPE_AND;
certUsage.Usage = enhkeyUsage;
chainPara.cbSize = sizeof(CERT_CHAIN_PARA);
chainPara.RequestedUsage = certUsage;
if (!CertGetCertificateChain(NULL, pCertContext, NULL, NULL,
&chainPara, 0, NULL, &pChainContext)) {
res = GT_CRYPTO_FAILURE;
goto cleanup;
}
if (pChainContext->TrustStatus.dwErrorStatus != CERT_TRUST_NO_ERROR) {
res = GT_CERT_NOT_TRUSTED;
goto cleanup;
}
/* Verify certificate chain. */
policyPara.cbSize = sizeof(CERT_CHAIN_POLICY_PARA);
policyPara.dwFlags = 0;
policyPara.pvExtraPolicyPara = NULL;
if (!CertVerifyCertificateChainPolicy(CERT_CHAIN_POLICY_BASE,
pChainContext, &policyPara, &policyStatus)) {
res = GT_CRYPTO_FAILURE;
goto cleanup;
}
if (policyStatus.dwError) {
res = GT_CERT_NOT_TRUSTED;
goto cleanup;
}
res = GT_OK;
cleanup:
GT_free(cert_der);
if (pChainContext != NULL) {
CertFreeCertificateChain(pChainContext);
}
if (pCertContext != NULL) {
CertFreeCertificateContext(pCertContext);
}
return res;
}
