def import_cert(self, cert_data, machine_keyset=True,
store_name=STORE_NAME_MY):
base64_cert_data = self._get_cert_base64(cert_data)
cert_encoded = None
store_handle = None
cert_context_p = None
try:
cert_encoded_len = wintypes.DWORD()
if not cryptoapi.CryptStringToBinaryW(
base64_cert_data, len(base64_cert_data),
cryptoapi.CRYPT_STRING_BASE64,
None, ctypes.byref(cert_encoded_len),
None, None):
raise cryptoapi.CryptoAPIException()
size = ctypes.c_size_t(cert_encoded_len.value)
cert_encoded = ctypes.cast(malloc(size),
ctypes.POINTER(wintypes.BYTE))
if not cryptoapi.CryptStringToBinaryW(
base64_cert_data, len(base64_cert_data),
cryptoapi.CRYPT_STRING_BASE64,
cert_encoded, ctypes.byref(cert_encoded_len),
None, None):
raise cryptoapi.CryptoAPIException()
if machine_keyset:
flags = cryptoapi.CERT_SYSTEM_STORE_LOCAL_MACHINE
else:
flags = cryptoapi.CERT_SYSTEM_STORE_CURRENT_USER
store_handle = cryptoapi.CertOpenStore(
cryptoapi.CERT_STORE_PROV_SYSTEM, 0, 0, flags,
six.text_type(store_name))
if not store_handle:
raise cryptoapi.CryptoAPIException()
cert_context_p = ctypes.POINTER(cryptoapi.CERT_CONTEXT)()
if not cryptoapi.CertAddEncodedCertificateToStore(
store_handle,
cryptoapi.X509_ASN_ENCODING |
cryptoapi.PKCS_7_ASN_ENCODING,
cert_encoded, cert_encoded_len,
cryptoapi.CERT_STORE_ADD_REPLACE_EXISTING,
ctypes.byref(cert_context_p)):
raise cryptoapi.CryptoAPIException()
# Get the UPN (1.3.6.1.4.1.311.20.2.3 OID) from the
# certificate subject alt name
upn = None
upn_len = cryptoapi.CertGetNameString(
cert_context_p,
cryptoapi.CERT_NAME_UPN_TYPE, 0,
None, None, 0)
if upn_len > 1:
upn_ar = ctypes.create_unicode_buffer(upn_len)
if cryptoapi.CertGetNameString(
cert_context_p,
cryptoapi.CERT_NAME_UPN_TYPE,
0, None, upn_ar, upn_len) != upn_len:
raise cryptoapi.CryptoAPIException()
upn = upn_ar.value
thumbprint = self._get_cert_thumprint(cert_context_p)
return thumbprint, upn
finally:
if cert_context_p:
cryptoapi.CertFreeCertificateContext(cert_context_p)
if store_handle:
cryptoapi.CertCloseStore(store_handle, 0)
if cert_encoded:
free(cert_encoded)
def decode_pkcs7_base64_blob(self,
data,
thumbprint_str,
machine_keyset=True,
store_name=STORE_NAME_MY):
base64_data = data.replace('\r', '').replace('\n', '')
store_handle = None
cert_context_p = None
try:
data_encoded_len = wintypes.DWORD()
if not cryptoapi.CryptStringToBinaryW(
base64_data, len(base64_data),
cryptoapi.CRYPT_STRING_BASE64, None,
ctypes.byref(data_encoded_len), None, None):
raise cryptoapi.CryptoAPIException()
data_encoded = ctypes.cast(
ctypes.create_string_buffer(data_encoded_len.value),
ctypes.POINTER(wintypes.BYTE))
if not cryptoapi.CryptStringToBinaryW(
base64_data, len(base64_data),
cryptoapi.CRYPT_STRING_BASE64, data_encoded,
ctypes.byref(data_encoded_len), None, None):
raise cryptoapi.CryptoAPIException()
store_handle = cryptoapi.CertOpenStore(
cryptoapi.CERT_STORE_PROV_MEMORY,
cryptoapi.X509_ASN_ENCODING | cryptoapi.PKCS_7_ASN_ENCODING,
None, cryptoapi.CERT_STORE_CREATE_NEW_FLAG, None)
if not store_handle:
raise cryptoapi.CryptoAPIException()
cert_context_p = self._find_certificate_in_store(
thumbprint_str, machine_keyset, store_name)
if not cryptoapi.CertAddCertificateLinkToStore(
store_handle, cert_context_p, cryptoapi.CERT_STORE_ADD_NEW,
None):
raise cryptoapi.CryptoAPIException()
para = cryptoapi.CRYPT_DECRYPT_MESSAGE_PARA()
para.cbSize = ctypes.sizeof(cryptoapi.CRYPT_DECRYPT_MESSAGE_PARA)
para.dwMsgAndCertEncodingType = (cryptoapi.X509_ASN_ENCODING
| cryptoapi.PKCS_7_ASN_ENCODING)
para.cCertStore = 1
para.rghCertStore = ctypes.pointer(wintypes.HANDLE(store_handle))
para.dwFlags = cryptoapi.CRYPT_SILENT
data_decoded_len = wintypes.DWORD()
if not cryptoapi.CryptDecryptMessage(
ctypes.byref(para), data_encoded, data_encoded_len, None,
ctypes.byref(data_decoded_len), None):
raise cryptoapi.CryptoAPIException()
data_decoded_buf = ctypes.create_string_buffer(
data_decoded_len.value)
data_decoded = ctypes.cast(data_decoded_buf,
ctypes.POINTER(wintypes.BYTE))
if not cryptoapi.CryptDecryptMessage(
ctypes.pointer(para), data_encoded, data_encoded_len,
data_decoded, ctypes.byref(data_decoded_len), None):
raise cryptoapi.CryptoAPIException()
return bytes(data_decoded_buf)
finally:
if cert_context_p:
cryptoapi.CertFreeCertificateContext(cert_context_p)
if store_handle:
cryptoapi.CertCloseStore(store_handle, 0)