mirror of
https://github.com/Grasscutters/mitmproxy.git
synced 2024-11-27 02:24:18 +00:00
263 lines
7.7 KiB
Python
263 lines
7.7 KiB
Python
import os, ssl, time, datetime, tempfile, shutil
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from pyasn1.type import univ, constraint, char, namedtype, tag
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from pyasn1.codec.der.decoder import decode
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from pyasn1.error import PyAsn1Error
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import OpenSSL
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import tcp
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def create_ca():
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key = OpenSSL.crypto.PKey()
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key.generate_key(OpenSSL.crypto.TYPE_RSA, 1024)
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ca = OpenSSL.crypto.X509()
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ca.set_serial_number(int(time.time()*10000))
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ca.set_version(2)
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ca.get_subject().CN = "mitmproxy"
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ca.get_subject().O = "mitmproxy"
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ca.gmtime_adj_notBefore(0)
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ca.gmtime_adj_notAfter(24 * 60 * 60 * 720)
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ca.set_issuer(ca.get_subject())
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ca.set_pubkey(key)
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ca.add_extensions([
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OpenSSL.crypto.X509Extension("basicConstraints", True,
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"CA:TRUE"),
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OpenSSL.crypto.X509Extension("nsCertType", True,
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"sslCA"),
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OpenSSL.crypto.X509Extension("extendedKeyUsage", True,
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"serverAuth,clientAuth,emailProtection,timeStamping,msCodeInd,msCodeCom,msCTLSign,msSGC,msEFS,nsSGC"
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),
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OpenSSL.crypto.X509Extension("keyUsage", False,
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"keyCertSign, cRLSign"),
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OpenSSL.crypto.X509Extension("subjectKeyIdentifier", False, "hash",
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subject=ca),
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])
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ca.sign(key, "sha1")
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return key, ca
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def dummy_ca(path):
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dirname = os.path.dirname(path)
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if not os.path.exists(dirname):
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os.makedirs(dirname)
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if path.endswith(".pem"):
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basename, _ = os.path.splitext(path)
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basename = os.path.basename(basename)
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else:
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basename = os.path.basename(path)
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key, ca = create_ca()
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# Dump the CA plus private key
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f = open(path, "wb")
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f.write(OpenSSL.crypto.dump_privatekey(OpenSSL.crypto.FILETYPE_PEM, key))
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f.write(OpenSSL.crypto.dump_certificate(OpenSSL.crypto.FILETYPE_PEM, ca))
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f.close()
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# Dump the certificate in PEM format
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f = open(os.path.join(dirname, basename + "-cert.pem"), "wb")
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f.write(OpenSSL.crypto.dump_certificate(OpenSSL.crypto.FILETYPE_PEM, ca))
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f.close()
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# Create a .cer file with the same contents for Android
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f = open(os.path.join(dirname, basename + "-cert.cer"), "wb")
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f.write(OpenSSL.crypto.dump_certificate(OpenSSL.crypto.FILETYPE_PEM, ca))
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f.close()
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# Dump the certificate in PKCS12 format for Windows devices
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f = open(os.path.join(dirname, basename + "-cert.p12"), "wb")
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p12 = OpenSSL.crypto.PKCS12()
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p12.set_certificate(ca)
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p12.set_privatekey(key)
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f.write(p12.export())
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f.close()
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return True
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def dummy_cert(ca, commonname, sans):
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"""
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Generates and writes a certificate to fp.
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ca: Path to the certificate authority file, or None.
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commonname: Common name for the generated certificate.
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sans: A list of Subject Alternate Names.
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Returns cert path if operation succeeded, None if not.
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"""
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ss = []
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for i in sans:
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ss.append("DNS: %s"%i)
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ss = ", ".join(ss)
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raw = file(ca, "rb").read()
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ca = OpenSSL.crypto.load_certificate(OpenSSL.crypto.FILETYPE_PEM, raw)
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key = OpenSSL.crypto.load_privatekey(OpenSSL.crypto.FILETYPE_PEM, raw)
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req = OpenSSL.crypto.X509Req()
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subj = req.get_subject()
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subj.CN = commonname
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req.set_pubkey(ca.get_pubkey())
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req.sign(key, "sha1")
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if ss:
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req.add_extensions([OpenSSL.crypto.X509Extension("subjectAltName", True, ss)])
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cert = OpenSSL.crypto.X509()
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cert.gmtime_adj_notBefore(-3600)
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cert.gmtime_adj_notAfter(60 * 60 * 24 * 30)
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cert.set_issuer(ca.get_subject())
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cert.set_subject(req.get_subject())
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cert.set_serial_number(int(time.time()*10000))
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if ss:
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cert.set_version(2)
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cert.add_extensions([OpenSSL.crypto.X509Extension("subjectAltName", True, ss)])
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cert.set_pubkey(req.get_pubkey())
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cert.sign(key, "sha1")
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return SSLCert(cert)
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class CertStore:
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"""
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Implements an in-memory certificate store.
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"""
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def __init__(self):
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self.certs = {}
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def check_domain(self, commonname):
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try:
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commonname.decode("idna")
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commonname.decode("ascii")
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except:
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return False
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if ".." in commonname:
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return False
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if "/" in commonname:
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return False
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return True
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def get_cert(self, commonname, sans, cacert):
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"""
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Returns an SSLCert object.
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commonname: Common name for the generated certificate. Must be a
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valid, plain-ASCII, IDNA-encoded domain name.
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sans: A list of Subject Alternate Names.
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cacert: The path to a CA certificate.
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Return None if the certificate could not be found or generated.
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"""
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if not self.check_domain(commonname):
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return None
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if commonname in self.certs:
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return self.certs[commonname]
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c = dummy_cert(cacert, commonname, sans)
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self.certs[commonname] = c
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return c
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class _GeneralName(univ.Choice):
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# We are only interested in dNSNames. We use a default handler to ignore
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# other types.
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componentType = namedtype.NamedTypes(
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namedtype.NamedType('dNSName', char.IA5String().subtype(
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implicitTag=tag.Tag(tag.tagClassContext, tag.tagFormatSimple, 2)
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)
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),
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)
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class _GeneralNames(univ.SequenceOf):
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componentType = _GeneralName()
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sizeSpec = univ.SequenceOf.sizeSpec + constraint.ValueSizeConstraint(1, 1024)
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class SSLCert:
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def __init__(self, cert):
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"""
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Returns a (common name, [subject alternative names]) tuple.
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"""
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self.x509 = cert
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@classmethod
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def from_pem(klass, txt):
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x509 = OpenSSL.crypto.load_certificate(OpenSSL.crypto.FILETYPE_PEM, txt)
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return klass(x509)
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@classmethod
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def from_der(klass, der):
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pem = ssl.DER_cert_to_PEM_cert(der)
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return klass.from_pem(pem)
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def to_pem(self):
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return OpenSSL.crypto.dump_certificate(OpenSSL.crypto.FILETYPE_PEM, self.x509)
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def digest(self, name):
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return self.x509.digest(name)
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@property
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def issuer(self):
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return self.x509.get_issuer().get_components()
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@property
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def notbefore(self):
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t = self.x509.get_notBefore()
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return datetime.datetime.strptime(t, "%Y%m%d%H%M%SZ")
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@property
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def notafter(self):
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t = self.x509.get_notAfter()
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return datetime.datetime.strptime(t, "%Y%m%d%H%M%SZ")
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@property
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def has_expired(self):
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return self.x509.has_expired()
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@property
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def subject(self):
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return self.x509.get_subject().get_components()
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@property
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def serial(self):
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return self.x509.get_serial_number()
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@property
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def keyinfo(self):
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pk = self.x509.get_pubkey()
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types = {
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OpenSSL.crypto.TYPE_RSA: "RSA",
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OpenSSL.crypto.TYPE_DSA: "DSA",
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}
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return (
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types.get(pk.type(), "UNKNOWN"),
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pk.bits()
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)
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@property
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def cn(self):
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c = None
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for i in self.subject:
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if i[0] == "CN":
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c = i[1]
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return c
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@property
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def altnames(self):
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altnames = []
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for i in range(self.x509.get_extension_count()):
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ext = self.x509.get_extension(i)
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if ext.get_short_name() == "subjectAltName":
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try:
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dec = decode(ext.get_data(), asn1Spec=_GeneralNames())
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except PyAsn1Error:
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continue
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for i in dec[0]:
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altnames.append(i[0].asOctets())
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return altnames
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def get_remote_cert(host, port, sni):
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c = tcp.TCPClient(host, port)
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c.connect()
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c.convert_to_ssl(sni=sni)
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return c.cert
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