cloud-email/cryptography - python cryptography

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author	Andre Caron <andre.l.caron@gmail.com>	2015-06-02 23:47:11 -0400
committer	Ian Cordasco <graffatcolmingov@gmail.com>	2015-06-24 13:35:49 -0500
commit	d259ee51abae5a35e34f16ad74bfb1c62aa433d7 (patch)
tree	77e9eaf41e48381a00ddb44b59a9d9b398ff05d3 /src
parent	99d0f90ff256b540acb007458bbb07c467642368 (diff)
download	cryptography-d259ee51abae5a35e34f16ad74bfb1c62aa433d7.tar.gz cryptography-d259ee51abae5a35e34f16ad74bfb1c62aa433d7.tar.bz2 cryptography-d259ee51abae5a35e34f16ad74bfb1c62aa433d7.zip

Polishes builder documentation,

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from __future__ import (absolute_import, print_function, division)
import os
import select
import socket
import sys
import threading
import time
import traceback

import binascii

from typing import Optional  # noqa

from netlib import strutils
from six.moves import range

import certifi
from backports import ssl_match_hostname
import six
import OpenSSL
from OpenSSL import SSL

from netlib import certutils
from netlib import version_check
from netlib import basetypes
from netlib import exceptions
from netlib import basethread

# This is a rather hackish way to make sure that
# the latest version of pyOpenSSL is actually installed.
version_check.check_pyopenssl_version()

if six.PY2:
    socket_fileobject = socket._fileobject
else:
    socket_fileobject = socket.SocketIO

EINTR = 4
if os.environ.get("NO_ALPN"):
    HAS_ALPN = False
else:
    HAS_ALPN = SSL._lib.Cryptography_HAS_ALPN

# To enable all SSL methods use: SSLv23
# then add options to disable certain methods
# https://bugs.launchpad.net/pyopenssl/+bug/1020632/comments/3
SSL_BASIC_OPTIONS = (
    SSL.OP_CIPHER_SERVER_PREFERENCE
)
if hasattr(SSL, "OP_NO_COMPRESSION"):
    SSL_BASIC_OPTIONS |= SSL.OP_NO_COMPRESSION

SSL_DEFAULT_METHOD = SSL.SSLv23_METHOD
SSL_DEFAULT_OPTIONS = (
    SSL.OP_NO_SSLv2 |
    SSL.OP_NO_SSLv3 |
    SSL_BASIC_OPTIONS
)
if hasattr(SSL, "OP_NO_COMPRESSION"):
    SSL_DEFAULT_OPTIONS |= SSL.OP_NO_COMPRESSION

"""
Map a reasonable SSL version specification into the format OpenSSL expects.
Don't ask...
https://bugs.launchpad.net/pyopenssl/+bug/1020632/comments/3
"""
sslversion_choices = {
    "all": (SSL.SSLv23_METHOD, SSL_BASIC_OPTIONS),
    # SSLv23_METHOD + NO_SSLv2 + NO_SSLv3 == TLS 1.0+
    # TLSv1_METHOD would be TLS 1.0 only
    "secure": (SSL.SSLv23_METHOD, (SSL.OP_NO_SSLv2 | SSL.OP_NO_SSLv3 | SSL_BASIC_OPTIONS)),
    "SSLv2": (SSL.SSLv2_METHOD, SSL_BASIC_OPTIONS),
    "SSLv3": (SSL.SSLv3_METHOD, SSL_BASIC_OPTIONS),
    "TLSv1": (SSL.TLSv1_METHOD, SSL_BASIC_OPTIONS),
    "TLSv1_1": (SSL.TLSv1_1_METHOD, SSL_BASIC_OPTIONS),
    "TLSv1_2": (SSL.TLSv1_2_METHOD, SSL_BASIC_OPTIONS),
}


class SSLKeyLogger(object):

    def __init__(self, filename):
        self.filename = filename
        self.f = None
        self.lock = threading.Lock()

    # required for functools.wraps, which pyOpenSSL uses.
    __name__ = "SSLKeyLogger"

    def __call__(self, connection, where, ret):
        if where == SSL.SSL_CB_HANDSHAKE_DONE and ret == 1:
            with self.lock:
                if not self.f:
                    d = os.path.dirname(self.filename)
                    if not os.path.isdir(d):
                        os.makedirs(d)
                    self.f = open(self.filename, "ab")
                    self.f.write(b"\r\n")
                client_random = binascii.hexlify(connection.client_random())
                masterkey = binascii.hexlify(connection.master_key())
                self.f.write(b"CLIENT_RANDOM %s %s\r\n" % (client_random, masterkey))
                self.f.flush()

    def close(self):
        with self.lock:
            if self.f:
                self.f.close()

    @staticmethod
    def create_logfun(filename):
        if filename:
            return SSLKeyLogger(filename)
        return False

log_ssl_key = SSLKeyLogger.create_logfun(
    os.getenv("MITMPROXY_SSLKEYLOGFILE") or os.getenv("SSLKEYLOGFILE"))


class _FileLike(object):
    BLOCKSIZE = 1024 * 32

    def __init__(self, o):
        self.o = o
        self._log = None
        self.first_byte_timestamp = None

    def set_descriptor(self, o):
        self.o = o

    def __getattr__(self, attr):
        return getattr(self.o, attr)

    def start_log(self):
        """
            Starts or resets the log.

            This will store all bytes read or written.
        """
        self._log = []

    def stop_log(self):
        """
            Stops the log.
        """
        self._log = None

    def is_logging(self):
        return self._log is not None

    def get_log(self):
        """
            Returns the log as a string.
        """
        if not self.is_logging():
            raise ValueError("Not logging!")
        return b"".join(self._log)

    def add_log(self, v):
        if self.is_logging():
            self._log.append(v)

    def reset_timestamps(self):
        self.first_byte_timestamp = None


class Writer(_FileLike):

    def flush(self):
        """
            May raise exceptions.TcpDisconnect
        """
        if hasattr(self.o, "flush"):
            try:
                self.o.flush()
            except (socket.error, IOError) as v:
                raise exceptions.TcpDisconnect(str(v))

    def write(self, v):
        """
            May raise exceptions.TcpDisconnect
        """
        if v:
            self.first_byte_timestamp = self.first_byte_timestamp or time.time()
            try:
                if hasattr(self.o, "sendall"):
                    self.add_log(v)
                    return self.o.sendall(v)
                else:
                    r = self.o.write(v)
                    self.add_log(v[:r])
                    return r
            except (SSL.Error, socket.error) as e:
                raise exceptions.TcpDisconnect(str(e))


class Reader(_FileLike):

    def read(self, length):
        """
            If length is -1, we read until connection closes.
        """
        result = b''
        start = time.time()
        while length == -1 or length > 0:
            if length == -1 or length > self.BLOCKSIZE:
                rlen = self.BLOCKSIZE
            else:
                rlen = length
            try:
                data = self.o.read(rlen)
            except SSL.ZeroReturnError:
                # TLS connection was shut down cleanly
                break
            except (SSL.WantWriteError, SSL.WantReadError):
                # From the OpenSSL docs:
                # If the underlying BIO is non-blocking, SSL_read() will also return when the
                # underlying BIO could not satisfy the needs of SSL_read() to continue the
                # operation. In this case a call to SSL_get_error with the return value of
                # SSL_read() will yield SSL_ERROR_WANT_READ or SSL_ERROR_WANT_WRITE.
                if (time.time() - start) < self.o.gettimeout():
                    time.sleep(0.1)
                    continue
                else:
                    raise exceptions.TcpTimeout()


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