import os, ssl, hashlib, socket, time, datetime from pyasn1.type import univ, constraint, char, namedtype, tag from pyasn1.codec.der.decoder import decode import OpenSSL CERT_SLEEP_TIME = 1 CERT_EXPIRY = str(365 * 3) def create_ca(): key = OpenSSL.crypto.PKey() key.generate_key(OpenSSL.crypto.TYPE_RSA, 1024) ca = OpenSSL.crypto.X509() ca.set_serial_number(int(time.time()*10000)) ca.set_version(2) ca.get_subject().CN = "mitmproxy" ca.get_subject().O = "mitmproxy" ca.gmtime_adj_notBefore(0) ca.gmtime_adj_notAfter(24 * 60 * 60 * 720) ca.set_issuer(ca.get_subject()) ca.set_pubkey(key) ca.add_extensions([ OpenSSL.crypto.X509Extension("basicConstraints", True, "CA:TRUE"), OpenSSL.crypto.X509Extension("nsCertType", True, "sslCA"), OpenSSL.crypto.X509Extension("extendedKeyUsage", True, "serverAuth,clientAuth,emailProtection,timeStamping,msCodeInd,msCodeCom,msCTLSign,msSGC,msEFS,nsSGC" ), OpenSSL.crypto.X509Extension("keyUsage", False, "keyCertSign, cRLSign"), OpenSSL.crypto.X509Extension("subjectKeyIdentifier", False, "hash", subject=ca), ]) ca.sign(key, "sha1") return key, ca def dummy_ca(path): dirname = os.path.dirname(path) if not os.path.exists(dirname): os.makedirs(dirname) if path.endswith(".pem"): basename, _ = os.path.splitext(path) else: basename = path key, ca = create_ca() # Dump the CA plus private key f = open(path, "w") f.write(OpenSSL.crypto.dump_privatekey(OpenSSL.crypto.FILETYPE_PEM, key)) f.write(OpenSSL.crypto.dump_certificate(OpenSSL.crypto.FILETYPE_PEM, ca)) f.close() # Dump the certificate in PEM format f = open(os.path.join(dirname, basename + "-cert.pem"), "w") f.write(OpenSSL.crypto.dump_certificate(OpenSSL.crypto.FILETYPE_PEM, ca)) f.close() # Create a .cer file with the same contents for Android f = open(os.path.join(dirname, basename + "-cert.cer"), "w") f.write(OpenSSL.crypto.dump_certificate(OpenSSL.crypto.FILETYPE_PEM, ca)) f.close() # Dump the certificate in PKCS12 format for Windows devices f = open(os.path.join(dirname, basename + "-cert.p12"), "w") p12 = OpenSSL.crypto.PKCS12() p12.set_certificate(ca) p12.set_privatekey(key) f.write(p12.export()) f.close() return True def dummy_cert(certdir, ca, commonname, sans): """ certdir: Certificate directory. ca: Path to the certificate authority file, or None. commonname: Common name for the generated certificate. Returns cert path if operation succeeded, None if not. """ namehash = hashlib.sha256(commonname).hexdigest() certpath = os.path.join(certdir, namehash + ".pem") if os.path.exists(certpath): return certpath ss = [] for i in sans: ss.append("DNS: %s"%i) ss = ", ".join(ss) if ca: raw = file(ca, "r").read() ca = OpenSSL.crypto.load_certificate(OpenSSL.crypto.FILETYPE_PEM, raw) key = OpenSSL.crypto.load_privatekey(OpenSSL.crypto.FILETYPE_PEM, raw) else: key, ca = create_ca() req = OpenSSL.crypto.X509Req() subj = req.get_subject() subj.CN = commonname req.set_pubkey(ca.get_pubkey()) req.sign(key, "sha1") if ss: req.add_extensions([OpenSSL.crypto.X509Extension("subjectAltName", True, ss)]) cert = OpenSSL.crypto.X509() cert.gmtime_adj_notBefore(0) cert.gmtime_adj_notAfter(60 * 60 * 24 * 30) cert.set_issuer(ca.get_subject()) cert.set_subject(req.get_subject()) cert.set_serial_number(int(time.time()*10000)) if ss: cert.add_extensions([OpenSSL.crypto.X509Extension("subjectAltName", True, ss)]) cert.set_pubkey(req.get_pubkey()) cert.sign(key, "sha1") f = open(certpath, "w") f.write(OpenSSL.crypto.dump_certificate(OpenSSL.crypto.FILETYPE_PEM, cert)) f.close() return certpath class _GeneralName(univ.Choice): # We are only interested in dNSNames. We use a default handler to ignore # other types. componentType = namedtype.NamedTypes( namedtype.NamedType('dNSName', char.IA5String().subtype( implicitTag=tag.Tag(tag.tagClassContext, tag.tagFormatSimple, 2) ) ), ) class _GeneralNames(univ.SequenceOf): componentType = _GeneralName() sizeSpec = univ.SequenceOf.sizeSpec + constraint.ValueSizeConstraint(1, 1024) class SSLCert: def __init__(self, pemtxt): """ Returns a (common name, [subject alternative names]) tuple. """ self.cert = OpenSSL.crypto.load_certificate(OpenSSL.crypto.FILETYPE_PEM, pemtxt) @classmethod def from_der(klass, der): pem = ssl.DER_cert_to_PEM_cert(der) return klass(pem) def digest(self, name): return self.cert.digest(name) @property def issuer(self): return self.cert.get_issuer().get_components() @property def notbefore(self): t = self.cert.get_notBefore() return datetime.datetime.strptime(t, "%Y%m%d%H%M%SZ") @property def notafter(self): t = self.cert.get_notAfter() return datetime.datetime.strptime(t, "%Y%m%d%H%M%SZ") @property def has_expired(self): return self.cert.has_expired() @property def subject(self): return self.cert.get_subject().get_components() @property def serial(self): return self.cert.get_serial_number() @property def keyinfo(self): pk = self.cert.get_pubkey() types = { OpenSSL.crypto.TYPE_RSA: "RSA", OpenSSL.crypto.TYPE_DSA: "DSA", } return ( types.get(pk.type(), "UNKNOWN"), pk.bits() ) @property def cn(self): cn = None for i in self.subject: if i[0] == "CN": cn = i[1] return cn @property def altnames(self): altnames = [] for i in range(self.cert.get_extension_count()): ext = self.cert.get_extension(i) if ext.get_short_name() == "subjectAltName": dec = decode(ext.get_data(), asn1Spec=_GeneralNames()) for i in dec[0]: altnames.append(i[0].asOctets()) return altnames def get_remote_cert(host, port): # pragma: no cover addr = socket.gethostbyname(host) s = ssl.get_server_certificate((addr, port)) return SSLCert(s)