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# -*- coding: utf-8 -*-
# certs.py
# Copyright (C) 2013 LEAP
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
"""
Implements cert checks and helpers
"""
import logging
from OpenSSL import crypto
from leap.util.check import leap_assert
logger = logging.getLogger(__name__)
def get_digest(cert_data, method):
"""
Returns the digest for the cert_data using the method specified
@param cert_data: certificate data in string form
@type cert_data: str
@param method: method to be used for digest
@type method: str
@rtype: str
"""
x509 = crypto.load_certificate(crypto.FILETYPE_PEM, cert_data)
digest = x509.digest(method).replace(":", "").lower()
return digest
def can_load_cert_and_pkey(string):
"""
Loads certificate and private key from a buffer, returns True if
everything went well, False otherwise
@param string: buffer containing the cert and private key
@type string: str or any kind of buffer
@rtype: bool
"""
can_load = True
try:
cert = crypto.load_certificate(crypto.FILETYPE_PEM, string)
key = crypto.load_privatekey(crypto.FILETYPE_PEM, string)
leap_assert(cert, 'The certificate could not be loaded')
leap_assert(key, 'The private key could not be loaded')
except Exception as e:
can_load = False
logger.error("Something went wrong while trying to load "
"the certificate: %r" % (e,))
return can_load
def is_valid_pemfile(cert):
"""
Checks that the passed string is a valid pem certificate
@param cert: String containing pem content
@type cert: str
@rtype: bool
"""
leap_assert(cert, "We need a cert to load")
return can_load_cert_and_pkey(cert)
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