diff options
Diffstat (limited to 'src/leap/crypto')
| -rw-r--r-- | src/leap/crypto/certs.py | 97 | ||||
| -rw-r--r-- | src/leap/crypto/certs_gnutls.py | 112 |
2 files changed, 162 insertions, 47 deletions
diff --git a/src/leap/crypto/certs.py b/src/leap/crypto/certs.py index 78f49fb0..cbb5725a 100644 --- a/src/leap/crypto/certs.py +++ b/src/leap/crypto/certs.py @@ -1,44 +1,55 @@ -import ctypes +import logging +import os from StringIO import StringIO -import socket +import ssl +import time -import gnutls.connection -import gnutls.crypto -import gnutls.library +from dateutil.parser import parse +from OpenSSL import crypto from leap.util.misc import null_check +logger = logging.getLogger(__name__) + class BadCertError(Exception): - """raised for malformed certs""" + """ + raised for malformed certs + """ -def get_https_cert_from_domain(domain): +class NoCertError(Exception): """ - @param domain: a domain name to get a certificate from. + raised for cert not found in given path """ - 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_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): - getcert = lambda f: gnutls.crypto.X509Certificate(f.read()) - if isinstance(_file, str): + null_check(_file, "pem file") + if isinstance(_file, (str, unicode)): + if not os.path.isfile(_file): + raise NoCertError with open(_file) as f: - cert = getcert(f) + cert = f.read() else: - cert = getcert(_file) - return cert + cert = _file.read() + x509 = crypto.load_certificate(crypto.FILETYPE_PEM, cert) + return x509 def get_pkey_from_file(_file): - getkey = lambda f: gnutls.crypto.X509PrivateKey(f.read()) + getkey = lambda f: crypto.load_privatekey( + crypto.FILETYPE_PEM, f.read()) + if isinstance(_file, str): with open(_file) as f: key = getkey(f) @@ -48,6 +59,10 @@ def get_pkey_from_file(_file): 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) @@ -57,14 +72,14 @@ def can_load_cert_and_pkey(string): null_check(cert, 'certificate') null_check(key, 'private key') - except: - # XXX catch GNUTLSError? + except Exception as exc: + logger.error(type(exc), exc.message) raise BadCertError else: return True -def get_cert_fingerprint(domain=None, filepath=None, +def get_cert_fingerprint(domain=None, port=443, filepath=None, hash_type="SHA256", sep=":"): """ @param domain: a domain name to get a fingerprint from @@ -79,31 +94,19 @@ def get_cert_fingerprint(domain=None, filepath=None, @rtype: string """ if domain: - cert = get_https_cert_from_domain(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 - _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) +def get_time_boundaries(certfile): + cert = get_cert_from_file(certfile) + null_check(cert, 'certificate') - return hex_fpr + fromts, tots = (cert.get_notBefore(), cert.get_notAfter()) + from_, to_ = map( + lambda ts: time.gmtime(time.mktime(parse(ts).timetuple())), + (fromts, tots)) + return from_, to_ 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 +''' |