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import logging
import os
from StringIO import StringIO
import ssl
from OpenSSL import crypto
from leap.util.misc import null_check
logger = logging.getLogger(__name__)
class BadCertError(Exception):
"""
raised for malformed certs
"""
class NoCertError(Exception):
"""
raised for cert not found in given path
"""
def get_https_cert_from_domain(domain, port=443):
"""
@param domain: a domain name to get a certificate from.
"""
cert = ssl.get_server_certificate((domain, port))
x509 = crypto.load_certificate(crypto.FILETYPE_PEM, cert)
return x509
def get_cert_from_file(_file):
null_check(_file, "pem file")
if isinstance(_file, str):
if not os.path.isfile(_file):
raise NoCertError
with open(_file) as f:
cert = f.read()
else:
cert = _file.read()
x509 = crypto.load_certificate(crypto.FILETYPE_PEM, cert)
return x509
def get_pkey_from_file(_file):
getkey = lambda f: crypto.load_privatekey(
crypto.FILETYPE_PEM, f.read())
if isinstance(_file, str):
with open(_file) as f:
key = getkey(f)
else:
key = getkey(_file)
return key
def can_load_cert_and_pkey(string):
"""
loads certificate and private key from
a buffer
"""
try:
f = StringIO(string)
cert = get_cert_from_file(f)
f = StringIO(string)
key = get_pkey_from_file(f)
null_check(cert, 'certificate')
null_check(key, 'private key')
except Exception as exc:
logger.error(type(exc), exc.message)
raise BadCertError
else:
return True
def get_cert_fingerprint(domain=None, port=443, filepath=None,
hash_type="SHA256", sep=":"):
"""
@param domain: a domain name to get a fingerprint from
@type domain: str
@param filepath: path to a file containing a PEM file
@type filepath: str
@param hash_type: the hash function to be used in the fingerprint.
must be one of SHA1, SHA224, SHA256, SHA384, SHA512
@type hash_type: str
@rparam: hex_fpr, a hexadecimal representation of a bytestring
containing the fingerprint.
@rtype: string
"""
if domain:
cert = get_https_cert_from_domain(domain, port=port)
if filepath:
cert = get_cert_from_file(filepath)
hex_fpr = cert.digest(hash_type)
return hex_fpr
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