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authorkali <kali@leap.se>2013-01-24 07:36:51 +0900
committerkali <kali@leap.se>2013-01-24 07:36:51 +0900
commit39430cf8c1f9b7118586b1a1f232168fb2d5730b (patch)
tree153eaa935a8f1ea59b04a743925eb69d5f834c82 /src/leap/crypto/certs_gnutls.py
parent88159d703e9b75d3cb0c192e7d7ae92d9d8c67bc (diff)
switch dependency to pyopenssl
Diffstat (limited to 'src/leap/crypto/certs_gnutls.py')
-rw-r--r--src/leap/crypto/certs_gnutls.py112
1 files changed, 112 insertions, 0 deletions
diff --git a/src/leap/crypto/certs_gnutls.py b/src/leap/crypto/certs_gnutls.py
new file mode 100644
index 00000000..20c0e043
--- /dev/null
+++ b/src/leap/crypto/certs_gnutls.py
@@ -0,0 +1,112 @@
+'''
+We're using PyOpenSSL now
+
+import ctypes
+from StringIO import StringIO
+import socket
+
+import gnutls.connection
+import gnutls.crypto
+import gnutls.library
+
+from leap.util.misc import null_check
+
+
+class BadCertError(Exception):
+ """raised for malformed certs"""
+
+
+def get_https_cert_from_domain(domain):
+ """
+ @param domain: a domain name to get a certificate from.
+ """
+ sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
+ cred = gnutls.connection.X509Credentials()
+
+ session = gnutls.connection.ClientSession(sock, cred)
+ session.connect((domain, 443))
+ session.handshake()
+ cert = session.peer_certificate
+ return cert
+
+
+def get_cert_from_file(_file):
+ getcert = lambda f: gnutls.crypto.X509Certificate(f.read())
+ if isinstance(_file, str):
+ with open(_file) as f:
+ cert = getcert(f)
+ else:
+ cert = getcert(_file)
+ return cert
+
+
+def get_pkey_from_file(_file):
+ getkey = lambda f: gnutls.crypto.X509PrivateKey(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):
+ 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:
+ # XXX catch GNUTLSError?
+ raise BadCertError
+ else:
+ return True
+
+def get_cert_fingerprint(domain=None, 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)
+ if filepath:
+ cert = get_cert_from_file(filepath)
+
+ _buffer = ctypes.create_string_buffer(64)
+ buffer_length = ctypes.c_size_t(64)
+
+ SUPPORTED_DIGEST_FUN = ("SHA1", "SHA224", "SHA256", "SHA384", "SHA512")
+ if hash_type in SUPPORTED_DIGEST_FUN:
+ digestfunction = getattr(
+ gnutls.library.constants,
+ "GNUTLS_DIG_%s" % hash_type)
+ else:
+ # XXX improperlyconfigured or something
+ raise Exception("digest function not supported")
+
+ gnutls.library.functions.gnutls_x509_crt_get_fingerprint(
+ cert._c_object, digestfunction,
+ ctypes.byref(_buffer), ctypes.byref(buffer_length))
+
+ # deinit
+ #server_cert._X509Certificate__deinit(server_cert._c_object)
+ # needed? is segfaulting
+
+ fpr = ctypes.string_at(_buffer, buffer_length.value)
+ hex_fpr = sep.join(u"%02X" % ord(char) for char in fpr)
+
+ return hex_fpr
+'''