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Issue #8550: Add first class `SSLContext` objects to the ssl module.

This commit is contained in:
Antoine Pitrou 2010-05-16 18:19:27 +00:00
parent 8eac60d9af
commit 152efa2ae2
7 changed files with 864 additions and 283 deletions
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281
Doc/library/ssl.rst
View File

@ -36,6 +36,11 @@ additional :meth:`read` and :meth:`write` methods, along with a method,
connection, and a method, :meth:`cipher`, to retrieve the cipher being used for
the secure connection.
For more sophisticated applications, the :class:`ssl.SSLContext` class
helps manage settings and certificates, which can then be inherited
by SSL sockets created through the :meth:`SSLContext.wrap_socket` method.
Functions, Constants, and Exceptions
------------------------------------
@ -64,19 +69,6 @@ Functions, Constants, and Exceptions
connection. See the discussion of :ref:`ssl-certificates` for more
information on how the certificate is stored in the ``certfile``.
Often the private key is stored in the same file as the certificate; in this
case, only the ``certfile`` parameter need be passed. If the private key is
stored in a separate file, both parameters must be used. If the private key
is stored in the ``certfile``, it should come before the first certificate in
the certificate chain::
-----BEGIN RSA PRIVATE KEY-----
... (private key in base64 encoding) ...
-----END RSA PRIVATE KEY-----
-----BEGIN CERTIFICATE-----
... (certificate in base64 PEM encoding) ...
-----END CERTIFICATE-----
The parameter ``server_side`` is a boolean which identifies whether
server-side or client-side behavior is desired from this socket.
@ -208,24 +200,36 @@ Functions, Constants, and Exceptions
.. data:: CERT_NONE
Value to pass to the ``cert_reqs`` parameter to :func:`sslobject` when no
certificates will be required or validated from the other side of the socket
connection.
Possible value for :attr:`SSLContext.verify_mode`, or the ``cert_reqs``
parameter to :func:`wrap_socket`. In this mode (the default), no
certificates will be required from the other side of the socket connection.
If a certificate is received from the other end, no attempt to validate it
is made.
See the discussion of :ref:`ssl-security` below.
.. data:: CERT_OPTIONAL
Value to pass to the ``cert_reqs`` parameter to :func:`sslobject` when no
certificates will be required from the other side of the socket connection,
but if they are provided, will be validated. Note that use of this setting
requires a valid certificate validation file also be passed as a value of the
``ca_certs`` parameter.
Possible value for :attr:`SSLContext.verify_mode`, or the ``cert_reqs``
parameter to :func:`wrap_socket`. In this mode no certificates will be
required from the other side of the socket connection; but if they
are provided, validation will be attempted and an :class:`SSLError`
will be raised on failure.
Use of this setting requires a valid set of CA certificates to
be passed, either to :meth:`SSLContext.load_verify_locations` or as a
value of the ``ca_certs`` parameter to :func:`wrap_socket`.
.. data:: CERT_REQUIRED
Value to pass to the ``cert_reqs`` parameter to :func:`sslobject` when
certificates will be required from the other side of the socket connection.
Note that use of this setting requires a valid certificate validation file
also be passed as a value of the ``ca_certs`` parameter.
Possible value for :attr:`SSLContext.verify_mode`, or the ``cert_reqs``
parameter to :func:`wrap_socket`. In this mode, certificates are
required from the other side of the socket connection; an :class:`SSLError`
will be raised if no certificate is provided, or if its validation fails.
Use of this setting requires a valid set of CA certificates to
be passed, either to :meth:`SSLContext.load_verify_locations` or as a
value of the ``ca_certs`` parameter to :func:`wrap_socket`.
.. data:: PROTOCOL_SSLv2
@ -284,8 +288,8 @@ Functions, Constants, and Exceptions
.. versionadded:: 3.2
SSLSocket Objects
-----------------
SSL Sockets
-----------
.. method:: SSLSocket.read(nbytes=1024, buffer=None)
@ -371,6 +375,83 @@ SSLSocket Objects
returned socket should always be used for further communication with the
other side of the connection, rather than the original socket.
SSL Contexts
------------
.. class:: SSLContext(protocol)
An object holding various data longer-lived than single SSL connections,
such as SSL configuration options, certificate(s) and private key(s).
You must pass *protocol* which must be one of the ``PROTOCOL_*`` constants
defined in this module. :data:`PROTOCOL_SSLv23` is recommended for
maximum interoperability.
:class:`SSLContext` objects have the following methods and attributes:
.. method:: SSLContext.load_cert_chain(certfile, keyfile=None)
Load a private key and the corresponding certificate. The *certfile*
string must be the path to a single file in PEM format containing the
certificate as well as any number of CA certificates needed to establish
the certificate's authenticity. The *keyfile* string, if present, must
point to a file containing the private key in. Otherwise the private
key will be taken from *certfile* as well. See the discussion of
:ref:`ssl-certificates` for more information on how the certificate
is stored in the *certfile*.
An :class:`SSLError` is raised if the private key doesn't
match with the certificate.
.. method:: SSLContext.load_verify_locations(cafile=None, capath=None)
Load a set of "certification authority" (CA) certificates used to validate
other peers' certificates when :data:`verify_mode` is other than
:data:`CERT_NONE`. At least one of *cafile* or *capath* must be specified.
The *cafile* string, if present, is the path to a file of concatenated
CA certificates in PEM format. See the discussion of
:ref:`ssl-certificates` for more information about how to arrange the
certificates in this file.
The *capath* string, if present, is
the path to a directory containing several CA certificates in PEM format,
following an `OpenSSL specific layout
<http://www.openssl.org/docs/ssl/SSL_CTX_load_verify_locations.html>`_.
.. method:: SSLContext.set_ciphers(ciphers)
Set the available ciphers for sockets created with this context.
It should be a string in the `OpenSSL cipher list format
<http://www.openssl.org/docs/apps/ciphers.html#CIPHER_LIST_FORMAT>`_.
If no cipher can be selected (because compile-time options or other
configuration forbids use of all the specified ciphers), an
:class:`SSLError` will be raised.
.. note::
when connected, the :meth:`SSLSocket.cipher` method of SSL sockets will
give the currently selected cipher.
.. method:: SSLContext.wrap_socket(sock, server_side=False, do_handshake_on_connect=True, suppress_ragged_eofs=True)
Wrap an existing Python socket *sock* and return an :class:`SSLSocket`
object. The SSL socket is tied to the context, its settings and
certificates. The parameters *server_side*, *do_handshake_on_connect*
and *suppress_ragged_eofs* have the same meaning as in the top-level
:func:`wrap_socket` function.
.. attribute:: SSLContext.protocol
The protocol version chosen when constructing the context. This attribute
is read-only.
.. attribute:: SSLContext.verify_mode
Whether to try to verify other peers' certificates and how to behave
if verification fails. This attribute must be one of
:data:`CERT_NONE`, :data:`CERT_OPTIONAL` or :data:`CERT_REQUIRED`.
.. index:: single: certificates
.. index:: single: X509 certificate
@ -416,6 +497,9 @@ and a footer line::
... (certificate in base64 PEM encoding) ...
-----END CERTIFICATE-----
Certificate chains
^^^^^^^^^^^^^^^^^^
The Python files which contain certificates can contain a sequence of
certificates, sometimes called a *certificate chain*. This chain should start
with the specific certificate for the principal who "is" the client or server,
@ -439,6 +523,9 @@ certification authority's certificate::
... (the root certificate for the CA's issuer)...
-----END CERTIFICATE-----
CA certificates
^^^^^^^^^^^^^^^
If you are going to require validation of the other side of the connection's
certificate, you need to provide a "CA certs" file, filled with the certificate
chains for each issuer you are willing to trust. Again, this file just contains
@ -458,6 +545,25 @@ peer is supposed to furnish the other certificates necessary to chain from its
certificate to a root certificate. See :rfc:`4158` for more discussion of the
way in which certification chains can be built.
Combined key and certificate
^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Often the private key is stored in the same file as the certificate; in this
case, only the ``certfile`` parameter to :meth:`SSLContext.load_cert_chain`
and :func:`wrap_socket` needs to be passed. If the private key is stored
with the certificate, it should come before the first certificate in
the certificate chain::
-----BEGIN RSA PRIVATE KEY-----
... (private key in base64 encoding) ...
-----END RSA PRIVATE KEY-----
-----BEGIN CERTIFICATE-----
... (certificate in base64 PEM encoding) ...
-----END CERTIFICATE-----
Self-signed certificates
^^^^^^^^^^^^^^^^^^^^^^^^
If you are going to create a server that provides SSL-encrypted connection
services, you will need to acquire a certificate for that service. There are
many ways of acquiring appropriate certificates, such as buying one from a
@ -530,8 +636,7 @@ certificate, sends some bytes, and reads part of the response::
print(pprint.pformat(ssl_sock.getpeercert()))
# Set a simple HTTP request -- use http.client in actual code.
ssl_sock.write("""GET / HTTP/1.0\r
Host: www.verisign.com\r\n\r\n""")
ssl_sock.write(b"GET / HTTP/1.0\r\nHost: www.verisign.com\r\n\r\n")
# Read a chunk of data. Will not necessarily
# read all the data returned by the server.
@ -561,39 +666,91 @@ this::
which is a fairly poorly-formed ``subject`` field.
This other example first creates an SSL context, instructs it to verify
certificates sent by peers, and feeds it a set of recognized certificate
authorities (CA)::
>>> context = ssl.SSLContext(ssl.PROTOCOL_SSLv23)
>>> context.verify_mode = ssl.CERT_OPTIONAL
>>> context.load_verify_locations("/etc/ssl/certs/ca-bundle.crt")
(it is assumed your operating system places a bundle of all CA certificates
in ``/etc/ssl/certs/ca-bundle.crt``; if not, you'll get an error and have
to adjust the location)
When you use the context to connect to a server, :const:`CERT_OPTIONAL`
validates the server certificate: it ensures that the server certificate
was signed with one of the CA certificates, and checks the signature for
correctness::
>>> conn = context.wrap_socket(socket.socket(socket.AF_INET))
>>> conn.connect(("linuxfr.org", 443))
You should then fetch the certificate and check its fields for conformity.
Here, the ``commonName`` field in the ``subject`` matches the desired HTTPS
host ``linuxfr.org``::
>>> pprint.pprint(conn.getpeercert())
{'notAfter': 'Jun 26 21:41:46 2011 GMT',
'subject': ((('commonName', 'linuxfr.org'),),),
'subjectAltName': (('DNS', 'linuxfr.org'), ('othername', '<unsupported>'))}
Now that you are assured of its authenticity, you can proceed to talk with
the server::
>>> conn.write(b"HEAD / HTTP/1.0\r\nHost: linuxfr.org\r\n\r\n")
38
>>> pprint.pprint(conn.read().split(b"\r\n"))
[b'HTTP/1.1 302 Found',
b'Date: Sun, 16 May 2010 13:43:28 GMT',
b'Server: Apache/2.2',
b'Location: https://linuxfr.org/pub/',
b'Vary: Accept-Encoding',
b'Connection: close',
b'Content-Type: text/html; charset=iso-8859-1',
b'',
b'']
See the discussion of :ref:`ssl-security` below.
Server-side operation
^^^^^^^^^^^^^^^^^^^^^
For server operation, typically you'd need to have a server certificate, and
private key, each in a file. You'd open a socket, bind it to a port, call
:meth:`listen` on it, then start waiting for clients to connect::
For server operation, typically you'll need to have a server certificate, and
private key, each in a file. You'll first create a context holding the key
and the certificate, so that clients can check your authenticity. Then
you'll open a socket, bind it to a port, call :meth:`listen` on it, and start
waiting for clients to connect::
import socket, ssl
context = ssl.SSLContext(ssl.PROTOCOL_TLSv1)
context.load_cert_chain(certfile="mycertfile", keyfile="mykeyfile")
bindsocket = socket.socket()
bindsocket.bind(('myaddr.mydomain.com', 10023))
bindsocket.listen(5)
When one did, you'd call :meth:`accept` on the socket to get the new socket from
the other end, and use :func:`wrap_socket` to create a server-side SSL context
for it::
When a client connects, you'll call :meth:`accept` on the socket to get the
new socket from the other end, and use the context's :meth:`SSLContext.wrap_socket`
method to create a server-side SSL socket for the connection::
while True:
newsocket, fromaddr = bindsocket.accept()
connstream = ssl.wrap_socket(newsocket,
server_side=True,
certfile="mycertfile",
keyfile="mykeyfile",
ssl_version=ssl.PROTOCOL_TLSv1)
deal_with_client(connstream)
connstream = context.wrap_socket(newsocket, server_side=True)
try:
deal_with_client(connstream)
finally:
connstream.close()
Then you'd read data from the ``connstream`` and do something with it till you
Then you'll read data from the ``connstream`` and do something with it till you
are finished with the client (or the client is finished with you)::
def deal_with_client(connstream):
data = connstream.read()
# null data means the client is finished with us
# empty data means the client is finished with us
while data:
if not do_something(connstream, data):
# we'll assume do_something returns False
@ -601,9 +758,41 @@ are finished with the client (or the client is finished with you)::
break
data = connstream.read()
# finished with client
connstream.close()
And go back to listening for new client connections.
And go back to listening for new client connections (of course, a real server
would probably handle each client connection in a separate thread, or put
the sockets in non-blocking mode and use an event loop).
.. _ssl-security:
Security considerations
-----------------------
Verifying certificates
^^^^^^^^^^^^^^^^^^^^^^
:const:`CERT_NONE` is the default. Since it does not authenticate the other
peer, it can be insecure, especially in client mode where most of time you
would like to ensure the authenticity of the server you're talking to.
Therefore, when in client mode, it is highly recommended to use
:const:`CERT_REQUIRED`. However, it is in itself not sufficient; you also
have to check that the server certificate (obtained with
:meth:`SSLSocket.getpeercert`) matches the desired service. The exact way
of doing so depends on the higher-level protocol used; for example, with
HTTPS, you'll check that the host name in the URL matches either the
``commonName`` field in the ``subjectName``, or one of the ``DNS`` fields
in the ``subjectAltName``.
In server mode, if you want to authenticate your clients using the SSL layer
(rather than using a higher-level authentication mechanism), you'll also have
to specify :const:`CERT_REQUIRED` and similarly check the client certificate.
.. note::
In client mode, :const:`CERT_OPTIONAL` and :const:`CERT_REQUIRED` are
equivalent unless anonymous ciphers are enabled (they are disabled
by default).
.. seealso::

71
Lib/ssl.py
View File

@ -59,7 +59,7 @@ import textwrap
import _ssl # if we can't import it, let the error propagate
from _ssl import OPENSSL_VERSION_NUMBER, OPENSSL_VERSION_INFO, OPENSSL_VERSION
from _ssl import SSLError
from _ssl import _SSLContext, SSLError
from _ssl import CERT_NONE, CERT_OPTIONAL, CERT_REQUIRED
from _ssl import (PROTOCOL_SSLv2, PROTOCOL_SSLv3, PROTOCOL_SSLv23,
PROTOCOL_TLSv1)
@ -84,8 +84,29 @@ import base64 # for DER-to-PEM translation
import traceback
import errno
class SSLSocket(socket):
class SSLContext(_SSLContext):
"""An SSLContext holds various SSL-related configuration options and
data, such as certificates and possibly a private key."""
__slots__ = ('protocol',)
def __new__(cls, protocol, *args, **kwargs):
return _SSLContext.__new__(cls, protocol)
def __init__(self, protocol):
self.protocol = protocol
def wrap_socket(self, sock, server_side=False,
do_handshake_on_connect=True,
suppress_ragged_eofs=True):
return SSLSocket(sock=sock, server_side=server_side,
do_handshake_on_connect=do_handshake_on_connect,
suppress_ragged_eofs=suppress_ragged_eofs,
_context=self)
class SSLSocket(socket):
"""This class implements a subtype of socket.socket that wraps
the underlying OS socket in an SSL context when necessary, and
provides read and write methods over that channel."""
@ -95,8 +116,31 @@ class SSLSocket(socket):
ssl_version=PROTOCOL_SSLv23, ca_certs=None,
do_handshake_on_connect=True,
family=AF_INET, type=SOCK_STREAM, proto=0, fileno=None,
suppress_ragged_eofs=True, ciphers=None):
suppress_ragged_eofs=True, ciphers=None,
_context=None):
if _context:
self.context = _context
else:
if certfile and not keyfile:
keyfile = certfile
self.context = SSLContext(ssl_version)
self.context.verify_mode = cert_reqs
if ca_certs:
self.context.load_verify_locations(ca_certs)
if certfile:
self.context.load_cert_chain(certfile, keyfile)
if ciphers:
self.context.set_ciphers(ciphers)
self.keyfile = keyfile
self.certfile = certfile
self.cert_reqs = cert_reqs
self.ssl_version = ssl_version
self.ca_certs = ca_certs
self.ciphers = ciphers
self.do_handshake_on_connect = do_handshake_on_connect
self.suppress_ragged_eofs = suppress_ragged_eofs
connected = False
if sock is not None:
socket.__init__(self,
@ -119,18 +163,12 @@ class SSLSocket(socket):
else:
socket.__init__(self, family=family, type=type, proto=proto)
if certfile and not keyfile:
keyfile = certfile
self._closed = False
self._sslobj = None
if connected:
# create the SSL object
try:
self._sslobj = _ssl.sslwrap(self, server_side,
keyfile, certfile,
cert_reqs, ssl_version, ca_certs,
ciphers)
self._sslobj = self.context._wrap_socket(self, server_side)
if do_handshake_on_connect:
timeout = self.gettimeout()
if timeout == 0.0:
@ -142,15 +180,6 @@ class SSLSocket(socket):
self.close()
raise x
self.keyfile = keyfile
self.certfile = certfile
self.cert_reqs = cert_reqs
self.ssl_version = ssl_version
self.ca_certs = ca_certs
self.ciphers = ciphers
self.do_handshake_on_connect = do_handshake_on_connect
self.suppress_ragged_eofs = suppress_ragged_eofs
def dup(self):
raise NotImplemented("Can't dup() %s instances" %
self.__class__.__name__)
@ -331,9 +360,7 @@ class SSLSocket(socket):
if self._sslobj:
raise ValueError("attempt to connect already-connected SSLSocket!")
socket.connect(self, addr)
self._sslobj = _ssl.sslwrap(self, False, self.keyfile, self.certfile,
self.cert_reqs, self.ssl_version,
self.ca_certs, self.ciphers)
self._sslobj = self.context._wrap_socket(self, False)
try:
if self.do_handshake_on_connect:
self.do_handshake()

14
Lib/test/capath/6e88d7b8.0 Normal file
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@ -0,0 +1,14 @@
-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----

41
Lib/test/capath/99d0fa06.0 Normal file
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@ -0,0 +1,41 @@
-----BEGIN CERTIFICATE-----
MIIHPTCCBSWgAwIBAgIBADANBgkqhkiG9w0BAQQFADB5MRAwDgYDVQQKEwdSb290
IENBMR4wHAYDVQQLExVodHRwOi8vd3d3LmNhY2VydC5vcmcxIjAgBgNVBAMTGUNB
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BgNVBAoTB1Jvb3QgQ0ExHjAcBgNVBAsTFWh0dHA6Ly93d3cuY2FjZXJ0Lm9yZzEi
MCAGA1UEAxMZQ0EgQ2VydCBTaWduaW5nIEF1dGhvcml0eTEhMB8GCSqGSIb3DQEJ
ARYSc3VwcG9ydEBjYWNlcnQub3JnMIICIjANBgkqhkiG9w0BAQEFAAOCAg8AMIIC
CgKCAgEAziLA4kZ97DYoB1CW8qAzQIxL8TtmPzHlawI229Z89vGIj053NgVBlfkJ
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Jzt7u0NDY8RD97LsaMzhGY4i+5jhe1o+ATc7iwiwovOVThrLm82asduycPAtStvY
sONvRUgzEv/+PDIqVPfE94rwiCPCR/5kenHA0R6mY7AHfqQv0wGP3J8rtsYIqQ+T
SCX8Ev2fQtzzxD72V7DX3WnRBnc0CkvSyqD/HMaMyRa+xMwyN2hzXwj7UfdJUzYF
CpUCTPJ5GhD22Dp1nPMd8aINcGeGG7MW9S/lpOt5hvk9C8JzC6WZrG/8Z7jlLwum
GCSNe9FINSkYQKyTYOGWhlC0elnYjyELn8+CkcY7v2vcB5G5l1YjqrZslMZIBjzk
zk6q5PYvCdxTby78dOs6Y5nCpqyJvKeyRKANihDjbPIky/qbn3BHLt4Ui9SyIAmW
omTxJBzcoTWcFbLUvFUufQb1nA5V9FrWk9p2rSVzTMVD
-----END CERTIFICATE-----

203
Lib/test/test_ssl.py
View File

@ -10,6 +10,7 @@ import gc
import os
import errno
import pprint
import tempfile
import urllib.parse, urllib.request
import traceback
import asyncore
@ -25,8 +26,30 @@ except ImportError:
skip_expected = True
HOST = support.HOST
CERTFILE = None
SVN_PYTHON_ORG_ROOT_CERT = None
PROTOCOLS = [
ssl.PROTOCOL_SSLv2, ssl.PROTOCOL_SSLv3,
ssl.PROTOCOL_SSLv23, ssl.PROTOCOL_TLSv1
]
data_file = lambda name: os.path.join(os.path.dirname(__file__), name)
fsencode = lambda name: name.encode(sys.getfilesystemencoding(), "surrogateescape")
CERTFILE = data_file("keycert.pem")
BYTES_CERTFILE = fsencode(CERTFILE)
ONLYCERT = data_file("ssl_cert.pem")
ONLYKEY = data_file("ssl_key.pem")
BYTES_ONLYCERT = fsencode(ONLYCERT)
BYTES_ONLYKEY = fsencode(ONLYKEY)
CAPATH = data_file("capath")
BYTES_CAPATH = fsencode(CAPATH)
SVN_PYTHON_ORG_ROOT_CERT = data_file("https_svn_python_org_root.pem")
EMPTYCERT = data_file("nullcert.pem")
BADCERT = data_file("badcert.pem")
WRONGCERT = data_file("XXXnonexisting.pem")
BADKEY = data_file("badkey.pem")
def handle_error(prefix):
exc_format = ' '.join(traceback.format_exception(*sys.exc_info()))
@ -34,7 +57,7 @@ def handle_error(prefix):
sys.stdout.write(prefix + exc_format)
class BasicTests(unittest.TestCase):
class BasicSocketTests(unittest.TestCase):
def test_constants(self):
ssl.PROTOCOL_SSLv2
@ -116,11 +139,10 @@ class BasicTests(unittest.TestCase):
s = ssl.wrap_socket(socket.socket(socket.AF_INET),
cert_reqs=ssl.CERT_NONE, ciphers="DEFAULT")
s.connect(remote)
# Error checking occurs when connecting, because the SSL context
# isn't created before.
s = ssl.wrap_socket(socket.socket(socket.AF_INET),
cert_reqs=ssl.CERT_NONE, ciphers="^$:,;?*'dorothyx")
# Error checking can happen at instantiation or when connecting
with self.assertRaisesRegexp(ssl.SSLError, "No cipher can be selected"):
s = ssl.wrap_socket(socket.socket(socket.AF_INET),
cert_reqs=ssl.CERT_NONE, ciphers="^$:,;?*'dorothyx")
s.connect(remote)
@support.cpython_only
@ -143,26 +165,103 @@ class BasicTests(unittest.TestCase):
self.assertEqual(timeout, ss.gettimeout())
class ContextTests(unittest.TestCase):
def test_constructor(self):
ctx = ssl.SSLContext(ssl.PROTOCOL_SSLv2)
ctx = ssl.SSLContext(ssl.PROTOCOL_SSLv23)
ctx = ssl.SSLContext(ssl.PROTOCOL_SSLv3)
ctx = ssl.SSLContext(ssl.PROTOCOL_TLSv1)
self.assertRaises(TypeError, ssl.SSLContext)
self.assertRaises(ValueError, ssl.SSLContext, -1)
self.assertRaises(ValueError, ssl.SSLContext, 42)
def test_protocol(self):
for proto in PROTOCOLS:
ctx = ssl.SSLContext(proto)
self.assertEqual(ctx.protocol, proto)
def test_ciphers(self):
ctx = ssl.SSLContext(ssl.PROTOCOL_TLSv1)
ctx.set_ciphers("ALL")
ctx.set_ciphers("DEFAULT")
with self.assertRaisesRegexp(ssl.SSLError, "No cipher can be selected"):
ctx.set_ciphers("^$:,;?*'dorothyx")
def test_verify(self):
ctx = ssl.SSLContext(ssl.PROTOCOL_TLSv1)
# Default value
self.assertEqual(ctx.verify_mode, ssl.CERT_NONE)
ctx.verify_mode = ssl.CERT_OPTIONAL
self.assertEqual(ctx.verify_mode, ssl.CERT_OPTIONAL)
ctx.verify_mode = ssl.CERT_REQUIRED
self.assertEqual(ctx.verify_mode, ssl.CERT_REQUIRED)
ctx.verify_mode = ssl.CERT_NONE
self.assertEqual(ctx.verify_mode, ssl.CERT_NONE)
with self.assertRaises(TypeError):
ctx.verify_mode = None
with self.assertRaises(ValueError):
ctx.verify_mode = 42
def test_load_cert_chain(self):
ctx = ssl.SSLContext(ssl.PROTOCOL_TLSv1)
# Combined key and cert in a single file
ctx.load_cert_chain(CERTFILE)
ctx.load_cert_chain(CERTFILE, keyfile=CERTFILE)
self.assertRaises(TypeError, ctx.load_cert_chain, keyfile=CERTFILE)
with self.assertRaisesRegexp(ssl.SSLError, "system lib"):
ctx.load_cert_chain(WRONGCERT)
with self.assertRaisesRegexp(ssl.SSLError, "PEM lib"):
ctx.load_cert_chain(BADCERT)
with self.assertRaisesRegexp(ssl.SSLError, "PEM lib"):
ctx.load_cert_chain(EMPTYCERT)
# Separate key and cert
ctx.load_cert_chain(ONLYCERT, ONLYKEY)
ctx.load_cert_chain(certfile=ONLYCERT, keyfile=ONLYKEY)
ctx.load_cert_chain(certfile=BYTES_ONLYCERT, keyfile=BYTES_ONLYKEY)
with self.assertRaisesRegexp(ssl.SSLError, "PEM lib"):
ctx.load_cert_chain(ONLYCERT)
with self.assertRaisesRegexp(ssl.SSLError, "PEM lib"):
ctx.load_cert_chain(ONLYKEY)
with self.assertRaisesRegexp(ssl.SSLError, "PEM lib"):
ctx.load_cert_chain(certfile=ONLYKEY, keyfile=ONLYCERT)
# Mismatching key and cert
with self.assertRaisesRegexp(ssl.SSLError, "key values mismatch"):
ctx.load_cert_chain(CERTFILE, ONLYKEY)
def test_load_verify_locations(self):
ctx = ssl.SSLContext(ssl.PROTOCOL_TLSv1)
ctx.load_verify_locations(CERTFILE)
ctx.load_verify_locations(cafile=CERTFILE, capath=None)
ctx.load_verify_locations(BYTES_CERTFILE)
ctx.load_verify_locations(cafile=BYTES_CERTFILE, capath=None)
self.assertRaises(TypeError, ctx.load_verify_locations)
self.assertRaises(TypeError, ctx.load_verify_locations, None, None)
with self.assertRaisesRegexp(ssl.SSLError, "system lib"):
ctx.load_verify_locations(WRONGCERT)
with self.assertRaisesRegexp(ssl.SSLError, "PEM lib"):
ctx.load_verify_locations(BADCERT)
ctx.load_verify_locations(CERTFILE, CAPATH)
ctx.load_verify_locations(CERTFILE, capath=BYTES_CAPATH)
class NetworkedTests(unittest.TestCase):
def test_connect(self):
s = ssl.wrap_socket(socket.socket(socket.AF_INET),
cert_reqs=ssl.CERT_NONE)
s.connect(("svn.python.org", 443))
c = s.getpeercert()
if c:
self.fail("Peer cert %s shouldn't be here!")
s.close()
try:
s.connect(("svn.python.org", 443))
self.assertEqual({}, s.getpeercert())
finally:
s.close()
# this should fail because we have no verification certs
s = ssl.wrap_socket(socket.socket(socket.AF_INET),
cert_reqs=ssl.CERT_REQUIRED)
try:
s.connect(("svn.python.org", 443))
except ssl.SSLError:
pass
finally:
s.close()
self.assertRaisesRegexp(ssl.SSLError, "certificate verify failed",
s.connect, ("svn.python.org", 443))
s.close()
# this should succeed because we specify the root cert
s = ssl.wrap_socket(socket.socket(socket.AF_INET),
@ -170,6 +269,56 @@ class NetworkedTests(unittest.TestCase):
ca_certs=SVN_PYTHON_ORG_ROOT_CERT)
try:
s.connect(("svn.python.org", 443))
self.assertTrue(s.getpeercert())
finally:
s.close()
def test_connect_with_context(self):
# Same as test_connect, but with a separately created context
ctx = ssl.SSLContext(ssl.PROTOCOL_SSLv23)
s = ctx.wrap_socket(socket.socket(socket.AF_INET))
s.connect(("svn.python.org", 443))
try:
self.assertEqual({}, s.getpeercert())
finally:
s.close()
# This should fail because we have no verification certs
ctx.verify_mode = ssl.CERT_REQUIRED
s = ctx.wrap_socket(socket.socket(socket.AF_INET))
self.assertRaisesRegexp(ssl.SSLError, "certificate verify failed",
s.connect, ("svn.python.org", 443))
s.close()
# This should succeed because we specify the root cert
ctx.load_verify_locations(SVN_PYTHON_ORG_ROOT_CERT)
s = ctx.wrap_socket(socket.socket(socket.AF_INET))
s.connect(("svn.python.org", 443))
try:
cert = s.getpeercert()
self.assertTrue(cert)
finally:
s.close()
def test_connect_capath(self):
# Verify server certificates using the `capath` argument
ctx = ssl.SSLContext(ssl.PROTOCOL_SSLv23)
ctx.verify_mode = ssl.CERT_REQUIRED
ctx.load_verify_locations(capath=CAPATH)
s = ctx.wrap_socket(socket.socket(socket.AF_INET))
s.connect(("svn.python.org", 443))
try:
cert = s.getpeercert()
self.assertTrue(cert)
finally:
s.close()
# Same with a bytes `capath` argument
ctx = ssl.SSLContext(ssl.PROTOCOL_SSLv23)
ctx.verify_mode = ssl.CERT_REQUIRED
ctx.load_verify_locations(capath=BYTES_CAPATH)
s = ctx.wrap_socket(socket.socket(socket.AF_INET))
s.connect(("svn.python.org", 443))
try:
cert = s.getpeercert()
self.assertTrue(cert)
finally:
s.close()
@ -1227,18 +1376,14 @@ def test_main(verbose=False):
if skip_expected:
raise unittest.SkipTest("No SSL support")
global CERTFILE, SVN_PYTHON_ORG_ROOT_CERT
CERTFILE = os.path.join(os.path.dirname(__file__) or os.curdir,
"keycert.pem")
SVN_PYTHON_ORG_ROOT_CERT = os.path.join(
os.path.dirname(__file__) or os.curdir,
"https_svn_python_org_root.pem")
for filename in [
CERTFILE, SVN_PYTHON_ORG_ROOT_CERT, BYTES_CERTFILE,
ONLYCERT, ONLYKEY, BYTES_ONLYCERT, BYTES_ONLYKEY,
BADCERT, BADKEY, EMPTYCERT]:
if not os.path.exists(filename):
raise support.TestFailed("Can't read certificate file %r" % filename)
if (not os.path.exists(CERTFILE) or
not os.path.exists(SVN_PYTHON_ORG_ROOT_CERT)):
raise support.TestFailed("Can't read certificate files!")
tests = [BasicTests]
tests = [ContextTests, BasicSocketTests]
if support.is_resource_enabled('network'):
tests.append(NetworkedTests)

2
Misc/NEWS
View File

@ -363,6 +363,8 @@ C-API
Library
-------
- Issue #8550: Add first class ``SSLContext`` objects to the ssl module.
- Issue #8681: Make the zlib module's error messages more informative when
the zlib itself doesn't give any detailed explanation.

535
Modules/_ssl.c
View File

@ -115,23 +115,29 @@ static unsigned int _ssl_locks_count = 0;
typedef struct {
PyObject_HEAD
PyObject *Socket; /* weakref to socket on which we're layered */
SSL_CTX* ctx;
SSL* ssl;
X509* peer_cert;
int shutdown_seen_zero;
SSL_CTX *ctx;
} PySSLContext;
} PySSLObject;
typedef struct {
PyObject_HEAD
PyObject *Socket; /* weakref to socket on which we're layered */
SSL *ssl;
X509 *peer_cert;
int shutdown_seen_zero;
} PySSLSocket;
static PyTypeObject PySSL_Type;
static PyObject *PySSL_SSLwrite(PySSLObject *self, PyObject *args);
static PyObject *PySSL_SSLread(PySSLObject *self, PyObject *args);
static PyTypeObject PySSLContext_Type;
static PyTypeObject PySSLSocket_Type;
static PyObject *PySSL_SSLwrite(PySSLSocket *self, PyObject *args);
static PyObject *PySSL_SSLread(PySSLSocket *self, PyObject *args);
static int check_socket_and_wait_for_timeout(PySocketSockObject *s,
int writing);
static PyObject *PySSL_peercert(PySSLObject *self, PyObject *args);
static PyObject *PySSL_cipher(PySSLObject *self);
static PyObject *PySSL_peercert(PySSLSocket *self, PyObject *args);
static PyObject *PySSL_cipher(PySSLSocket *self);
#define PySSLObject_Check(v) (Py_TYPE(v) == &PySSL_Type)
#define PySSLContext_Check(v) (Py_TYPE(v) == &PySSLContext_Type)
#define PySSLSocket_Check(v) (Py_TYPE(v) == &PySSLSocket_Type)
typedef enum {
SOCKET_IS_NONBLOCKING,
@ -154,7 +160,7 @@ typedef enum {
*/
static PyObject *
PySSL_SetError(PySSLObject *obj, int ret, char *filename, int lineno)
PySSL_SetError(PySSLSocket *obj, int ret, char *filename, int lineno)
{
PyObject *v;
char buf[2048];
@ -258,126 +264,28 @@ _setSSLError (char *errstr, int errcode, char *filename, int lineno) {
return NULL;
}
static PySSLObject *
newPySSLObject(PySocketSockObject *Sock, char *key_file, char *cert_file,
enum py_ssl_server_or_client socket_type,
enum py_ssl_cert_requirements certreq,
enum py_ssl_version proto_version,
char *cacerts_file, char *ciphers)
static PySSLSocket *
newPySSLSocket(SSL_CTX *ctx, PySocketSockObject *sock,
enum py_ssl_server_or_client socket_type)
{
PySSLObject *self;
char *errstr = NULL;
int ret;
int verification_mode;
PySSLSocket *self;
self = PyObject_New(PySSLObject, &PySSL_Type); /* Create new object */
self = PyObject_New(PySSLSocket, &PySSLSocket_Type);
if (self == NULL)
return NULL;
self->peer_cert = NULL;
self->ssl = NULL;
self->ctx = NULL;
self->Socket = NULL;
/* Make sure the SSL error state is initialized */
(void) ERR_get_state();
ERR_clear_error();
if ((key_file && !cert_file) || (!key_file && cert_file)) {
errstr = ERRSTR("Both the key & certificate files "
"must be specified");
goto fail;
}
if ((socket_type == PY_SSL_SERVER) &&
((key_file == NULL) || (cert_file == NULL))) {
errstr = ERRSTR("Both the key & certificate files "
"must be specified for server-side operation");
goto fail;
}
PySSL_BEGIN_ALLOW_THREADS
if (proto_version == PY_SSL_VERSION_TLS1)
self->ctx = SSL_CTX_new(TLSv1_method()); /* Set up context */
else if (proto_version == PY_SSL_VERSION_SSL3)
self->ctx = SSL_CTX_new(SSLv3_method()); /* Set up context */
else if (proto_version == PY_SSL_VERSION_SSL2)
self->ctx = SSL_CTX_new(SSLv2_method()); /* Set up context */
else if (proto_version == PY_SSL_VERSION_SSL23)
self->ctx = SSL_CTX_new(SSLv23_method()); /* Set up context */
self->ssl = SSL_new(ctx);
PySSL_END_ALLOW_THREADS
if (self->ctx == NULL) {
errstr = ERRSTR("Invalid SSL protocol variant specified.");
goto fail;
}
if (ciphers != NULL) {
ret = SSL_CTX_set_cipher_list(self->ctx, ciphers);
if (ret == 0) {
errstr = ERRSTR("No cipher can be selected.");
goto fail;
}
}
if (certreq != PY_SSL_CERT_NONE) {
if (cacerts_file == NULL) {
errstr = ERRSTR("No root certificates specified for "
"verification of other-side certificates.");
goto fail;
} else {
PySSL_BEGIN_ALLOW_THREADS
ret = SSL_CTX_load_verify_locations(self->ctx,
cacerts_file,
NULL);
PySSL_END_ALLOW_THREADS
if (ret != 1) {
_setSSLError(NULL, 0, __FILE__, __LINE__);
goto fail;
}
}
}
if (key_file) {
PySSL_BEGIN_ALLOW_THREADS
ret = SSL_CTX_use_PrivateKey_file(self->ctx, key_file,
SSL_FILETYPE_PEM);
PySSL_END_ALLOW_THREADS
if (ret != 1) {
_setSSLError(NULL, ret, __FILE__, __LINE__);
goto fail;
}
PySSL_BEGIN_ALLOW_THREADS
ret = SSL_CTX_use_certificate_chain_file(self->ctx,
cert_file);
PySSL_END_ALLOW_THREADS
if (ret != 1) {
/*
fprintf(stderr, "ret is %d, errcode is %lu, %lu, with file \"%s\"\n",
ret, ERR_peek_error(), ERR_peek_last_error(), cert_file);
*/
if (ERR_peek_last_error() != 0) {
_setSSLError(NULL, ret, __FILE__, __LINE__);
goto fail;
}
}
}
/* ssl compatibility */
SSL_CTX_set_options(self->ctx, SSL_OP_ALL);
verification_mode = SSL_VERIFY_NONE;
if (certreq == PY_SSL_CERT_OPTIONAL)
verification_mode = SSL_VERIFY_PEER;
else if (certreq == PY_SSL_CERT_REQUIRED)
verification_mode = (SSL_VERIFY_PEER |
SSL_VERIFY_FAIL_IF_NO_PEER_CERT);
SSL_CTX_set_verify(self->ctx, verification_mode,
NULL); /* set verify lvl */
PySSL_BEGIN_ALLOW_THREADS
self->ssl = SSL_new(self->ctx); /* New ssl struct */
PySSL_END_ALLOW_THREADS
SSL_set_fd(self->ssl, Sock->sock_fd); /* Set the socket for SSL */
SSL_set_fd(self->ssl, sock->sock_fd);
#ifdef SSL_MODE_AUTO_RETRY
SSL_set_mode(self->ssl, SSL_MODE_AUTO_RETRY);
#endif
@ -385,8 +293,7 @@ newPySSLObject(PySocketSockObject *Sock, char *key_file, char *cert_file,
/* If the socket is in non-blocking mode or timeout mode, set the BIO
* to non-blocking mode (blocking is the default)
*/
if (Sock->sock_timeout >= 0.0) {
/* Set both the read and write BIO's to non-blocking mode */
if (sock->sock_timeout >= 0.0) {
BIO_set_nbio(SSL_get_rbio(self->ssl), 1);
BIO_set_nbio(SSL_get_wbio(self->ssl), 1);
}
@ -398,57 +305,13 @@ newPySSLObject(PySocketSockObject *Sock, char *key_file, char *cert_file,
SSL_set_accept_state(self->ssl);
PySSL_END_ALLOW_THREADS
self->Socket = PyWeakref_NewRef((PyObject *) Sock, Py_None);
self->Socket = PyWeakref_NewRef((PyObject *) sock, NULL);
return self;
fail:
if (errstr)
PyErr_SetString(PySSLErrorObject, errstr);
Py_DECREF(self);
return NULL;
}
static PyObject *
PySSL_sslwrap(PyObject *self, PyObject *args)
{
PySocketSockObject *Sock;
int server_side = 0;
int verification_mode = PY_SSL_CERT_NONE;
int protocol = PY_SSL_VERSION_SSL23;
char *key_file = NULL;
char *cert_file = NULL;
char *cacerts_file = NULL;
char *ciphers = NULL;
if (!PyArg_ParseTuple(args, "O!i|zziizz:sslwrap",
PySocketModule.Sock_Type,
&Sock,
&server_side,
&key_file, &cert_file,
&verification_mode, &protocol,
&cacerts_file, &ciphers))
return NULL;
/*
fprintf(stderr,
"server_side is %d, keyfile %p, certfile %p, verify_mode %d, "
"protocol %d, certs %p\n",
server_side, key_file, cert_file, verification_mode,
protocol, cacerts_file);
*/
return (PyObject *) newPySSLObject(Sock, key_file, cert_file,
server_side, verification_mode,
protocol, cacerts_file,
ciphers);
}
PyDoc_STRVAR(ssl_doc,
"sslwrap(socket, server_side, [keyfile, certfile, certs_mode, protocol,\n"
" cacertsfile, ciphers]) -> sslobject");
/* SSL object methods */
static PyObject *PySSL_SSLdo_handshake(PySSLObject *self)
static PyObject *PySSL_SSLdo_handshake(PySSLSocket *self)
{
int ret;
int err;
@ -986,7 +849,7 @@ PySSL_test_decode_certificate (PyObject *mod, PyObject *args) {
static PyObject *
PySSL_peercert(PySSLObject *self, PyObject *args)
PySSL_peercert(PySSLSocket *self, PyObject *args)
{
PyObject *retval = NULL;
int len;
@ -1017,8 +880,7 @@ PySSL_peercert(PySSLObject *self, PyObject *args)
return retval;
} else {
verification = SSL_CTX_get_verify_mode(self->ctx);
verification = SSL_CTX_get_verify_mode(SSL_get_SSL_CTX(self->ssl));
if ((verification & SSL_VERIFY_PEER) == 0)
return PyDict_New();
else
@ -1038,7 +900,7 @@ If the optional argument is True, returns a DER-encoded copy of the\n\
peer certificate, or None if no certificate was provided. This will\n\
return the certificate even if it wasn't validated.");
static PyObject *PySSL_cipher (PySSLObject *self) {
static PyObject *PySSL_cipher (PySSLSocket *self) {
PyObject *retval, *v;
SSL_CIPHER *current;
@ -1084,14 +946,12 @@ static PyObject *PySSL_cipher (PySSLObject *self) {
return NULL;
}
static void PySSL_dealloc(PySSLObject *self)
static void PySSL_dealloc(PySSLSocket *self)
{
if (self->peer_cert) /* Possible not to have one? */
X509_free (self->peer_cert);
if (self->ssl)
SSL_free(self->ssl);
if (self->ctx)
SSL_CTX_free(self->ctx);
Py_XDECREF(self->Socket);
PyObject_Del(self);
}
@ -1166,7 +1026,7 @@ normal_return:
return rc == 0 ? SOCKET_HAS_TIMED_OUT : SOCKET_OPERATION_OK;
}
static PyObject *PySSL_SSLwrite(PySSLObject *self, PyObject *args)
static PyObject *PySSL_SSLwrite(PySSLSocket *self, PyObject *args)
{
Py_buffer buf;
int len;
@ -1250,7 +1110,7 @@ PyDoc_STRVAR(PySSL_SSLwrite_doc,
Writes the string s into the SSL object. Returns the number\n\
of bytes written.");
static PyObject *PySSL_SSLpending(PySSLObject *self)
static PyObject *PySSL_SSLpending(PySSLSocket *self)
{
int count = 0;
@ -1269,7 +1129,7 @@ PyDoc_STRVAR(PySSL_SSLpending_doc,
Returns the number of already decrypted bytes available for read,\n\
pending on the connection.\n");
static PyObject *PySSL_SSLread(PySSLObject *self, PyObject *args)
static PyObject *PySSL_SSLread(PySSLSocket *self, PyObject *args)
{
PyObject *dest = NULL;
Py_buffer buf;
@ -1392,7 +1252,7 @@ PyDoc_STRVAR(PySSL_SSLread_doc,
\n\
Read up to len bytes from the SSL socket.");
static PyObject *PySSL_SSLshutdown(PySSLObject *self)
static PyObject *PySSL_SSLshutdown(PySSLSocket *self)
{
int err, ssl_err, sockstate, nonblocking;
int zeros = 0;
@ -1497,10 +1357,10 @@ static PyMethodDef PySSLMethods[] = {
{NULL, NULL}
};
static PyTypeObject PySSL_Type = {
static PyTypeObject PySSLSocket_Type = {
PyVarObject_HEAD_INIT(NULL, 0)
"ssl.SSLContext", /*tp_name*/
sizeof(PySSLObject), /*tp_basicsize*/
"_ssl._SSLSocket", /*tp_name*/
sizeof(PySSLSocket), /*tp_basicsize*/
0, /*tp_itemsize*/
/* methods */
(destructor)PySSL_dealloc, /*tp_dealloc*/
@ -1529,6 +1389,306 @@ static PyTypeObject PySSL_Type = {
PySSLMethods, /*tp_methods*/
};
/*
* _SSLContext objects
*/
static PyObject *
context_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
{
char *kwlist[] = {"protocol", NULL};
PySSLContext *self;
int proto_version = PY_SSL_VERSION_SSL23;
SSL_CTX *ctx = NULL;
if (!PyArg_ParseTupleAndKeywords(
args, kwds, "i:_SSLContext", kwlist,
&proto_version))
return NULL;
PySSL_BEGIN_ALLOW_THREADS
if (proto_version == PY_SSL_VERSION_TLS1)
ctx = SSL_CTX_new(TLSv1_method());
else if (proto_version == PY_SSL_VERSION_SSL3)
ctx = SSL_CTX_new(SSLv3_method());
else if (proto_version == PY_SSL_VERSION_SSL2)
ctx = SSL_CTX_new(SSLv2_method());
else if (proto_version == PY_SSL_VERSION_SSL23)
ctx = SSL_CTX_new(SSLv23_method());
else
proto_version = -1;
PySSL_END_ALLOW_THREADS
if (proto_version == -1) {
PyErr_SetString(PyExc_ValueError,
"invalid protocol version");
return NULL;
}
if (ctx == NULL) {
PyErr_SetString(PySSLErrorObject,
"failed to allocate SSL context");
return NULL;
}
assert(type != NULL && type->tp_alloc != NULL);
self = (PySSLContext *) type->tp_alloc(type, 0);
if (self == NULL) {
SSL_CTX_free(ctx);
return NULL;
}
self->ctx = ctx;
/* Defaults */
SSL_CTX_set_verify(self->ctx, SSL_VERIFY_NONE, NULL);
SSL_CTX_set_options(self->ctx, SSL_OP_ALL);
return (PyObject *)self;
}
static void
context_dealloc(PySSLContext *self)
{
SSL_CTX_free(self->ctx);
Py_TYPE(self)->tp_free(self);
}
static PyObject *
set_ciphers(PySSLContext *self, PyObject *args)
{
int ret;
const char *cipherlist;
if (!PyArg_ParseTuple(args, "s:set_ciphers", &cipherlist))
return NULL;
ret = SSL_CTX_set_cipher_list(self->ctx, cipherlist);
if (ret == 0) {
PyErr_SetString(PySSLErrorObject,
"No cipher can be selected.");
return NULL;
}
Py_RETURN_NONE;
}
static PyObject *
get_verify_mode(PySSLContext *self, void *c)
{
switch (SSL_CTX_get_verify_mode(self->ctx)) {
case SSL_VERIFY_NONE:
return PyLong_FromLong(PY_SSL_CERT_NONE);
case SSL_VERIFY_PEER:
return PyLong_FromLong(PY_SSL_CERT_OPTIONAL);
case SSL_VERIFY_PEER | SSL_VERIFY_FAIL_IF_NO_PEER_CERT:
return PyLong_FromLong(PY_SSL_CERT_REQUIRED);
}
PyErr_SetString(PySSLErrorObject,
"invalid return value from SSL_CTX_get_verify_mode");
return NULL;
}
static int
set_verify_mode(PySSLContext *self, PyObject *arg, void *c)
{
int n, mode;
if (!PyArg_Parse(arg, "i", &n))
return -1;
if (n == PY_SSL_CERT_NONE)
mode = SSL_VERIFY_NONE;
else if (n == PY_SSL_CERT_OPTIONAL)
mode = SSL_VERIFY_PEER;
else if (n == PY_SSL_CERT_REQUIRED)
mode = SSL_VERIFY_PEER | SSL_VERIFY_FAIL_IF_NO_PEER_CERT;
else {
PyErr_SetString(PyExc_ValueError,
"invalid value for verify_mode");
return -1;
}
SSL_CTX_set_verify(self->ctx, mode, NULL);
return 0;
}
static PyObject *
load_cert_chain(PySSLContext *self, PyObject *args, PyObject *kwds)
{
char *kwlist[] = {"certfile", "keyfile", NULL};
PyObject *certfile, *keyfile = NULL;
PyObject *certfile_bytes = NULL, *keyfile_bytes = NULL;
int r;
if (!PyArg_ParseTupleAndKeywords(args, kwds,
"O|O:load_cert_chain", kwlist,
&certfile, &keyfile))
return NULL;
if (keyfile == Py_None)
keyfile = NULL;
if (!PyUnicode_FSConverter(certfile, &certfile_bytes)) {
PyErr_SetString(PyExc_TypeError,
"certfile should be a valid filesystem path");
return NULL;
}
if (keyfile && !PyUnicode_FSConverter(keyfile, &keyfile_bytes)) {
PyErr_SetString(PyExc_TypeError,
"keyfile should be a valid filesystem path");
goto error;
}
PySSL_BEGIN_ALLOW_THREADS
r = SSL_CTX_use_certificate_chain_file(self->ctx,
PyBytes_AS_STRING(certfile_bytes));
PySSL_END_ALLOW_THREADS
if (r != 1) {
_setSSLError(NULL, 0, __FILE__, __LINE__);
goto error;
}
PySSL_BEGIN_ALLOW_THREADS
r = SSL_CTX_use_RSAPrivateKey_file(self->ctx,
PyBytes_AS_STRING(keyfile ? keyfile_bytes : certfile_bytes),
SSL_FILETYPE_PEM);
PySSL_END_ALLOW_THREADS
Py_XDECREF(keyfile_bytes);
Py_XDECREF(certfile_bytes);
if (r != 1) {
_setSSLError(NULL, 0, __FILE__, __LINE__);
return NULL;
}
PySSL_BEGIN_ALLOW_THREADS
r = SSL_CTX_check_private_key(self->ctx);
PySSL_END_ALLOW_THREADS
if (r != 1) {
_setSSLError(NULL, 0, __FILE__, __LINE__);
return NULL;
}
Py_RETURN_NONE;
error:
Py_XDECREF(keyfile_bytes);
Py_XDECREF(certfile_bytes);
return NULL;
}
static PyObject *
load_verify_locations(PySSLContext *self, PyObject *args, PyObject *kwds)
{
char *kwlist[] = {"cafile", "capath", NULL};
PyObject *cafile = NULL, *capath = NULL;
PyObject *cafile_bytes = NULL, *capath_bytes = NULL;
const char *cafile_buf = NULL, *capath_buf = NULL;
int r;
if (!PyArg_ParseTupleAndKeywords(args, kwds,
"|OO:load_verify_locations", kwlist,
&cafile, &capath))
return NULL;
if (cafile == Py_None)
cafile = NULL;
if (capath == Py_None)
capath = NULL;
if (cafile == NULL && capath == NULL) {
PyErr_SetString(PyExc_TypeError,
"cafile and capath cannot be both omitted");
return NULL;
}
if (cafile && !PyUnicode_FSConverter(cafile, &cafile_bytes)) {
PyErr_SetString(PyExc_TypeError,
"cafile should be a valid filesystem path");
return NULL;
}
if (capath && !PyUnicode_FSConverter(capath, &capath_bytes)) {
Py_DECREF(cafile_bytes);
PyErr_SetString(PyExc_TypeError,
"capath should be a valid filesystem path");
return NULL;
}
if (cafile)
cafile_buf = PyBytes_AS_STRING(cafile_bytes);
if (capath)
capath_buf = PyBytes_AS_STRING(capath_bytes);
PySSL_BEGIN_ALLOW_THREADS
r = SSL_CTX_load_verify_locations(self->ctx, cafile_buf, capath_buf);
PySSL_END_ALLOW_THREADS
Py_XDECREF(cafile_bytes);
Py_XDECREF(capath_bytes);
if (r != 1) {
_setSSLError(NULL, 0, __FILE__, __LINE__);
return NULL;
}
Py_RETURN_NONE;
}
static PyObject *
context_wrap_socket(PySSLContext *self, PyObject *args, PyObject *kwds)
{
char *kwlist[] = {"sock", "server_side", NULL};
PySocketSockObject *sock;
int server_side = 0;
if (!PyArg_ParseTupleAndKeywords(args, kwds, "O!i:_wrap_socket", kwlist,
PySocketModule.Sock_Type,
&sock, &server_side))
return NULL;
return (PyObject *) newPySSLSocket(self->ctx, sock, server_side);
}
static PyGetSetDef context_getsetlist[] = {
{"verify_mode", (getter) get_verify_mode,
(setter) set_verify_mode, NULL},
{NULL}, /* sentinel */
};
static struct PyMethodDef context_methods[] = {
{"_wrap_socket", (PyCFunction) context_wrap_socket,
METH_VARARGS | METH_KEYWORDS, NULL},
{"set_ciphers", (PyCFunction) set_ciphers,
METH_VARARGS, NULL},
{"load_cert_chain", (PyCFunction) load_cert_chain,
METH_VARARGS | METH_KEYWORDS, NULL},
{"load_verify_locations", (PyCFunction) load_verify_locations,
METH_VARARGS | METH_KEYWORDS, NULL},
{NULL, NULL} /* sentinel */
};
static PyTypeObject PySSLContext_Type = {
PyVarObject_HEAD_INIT(NULL, 0)
"_ssl._SSLContext", /*tp_name*/
sizeof(PySSLContext), /*tp_basicsize*/
0, /*tp_itemsize*/
(destructor)context_dealloc, /*tp_dealloc*/
0, /*tp_print*/
0, /*tp_getattr*/
0, /*tp_setattr*/
0, /*tp_reserved*/
0, /*tp_repr*/
0, /*tp_as_number*/
0, /*tp_as_sequence*/
0, /*tp_as_mapping*/
0, /*tp_hash*/
0, /*tp_call*/
0, /*tp_str*/
0, /*tp_getattro*/
0, /*tp_setattro*/
0, /*tp_as_buffer*/
Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE, /*tp_flags*/
0, /*tp_doc*/
0, /*tp_traverse*/
0, /*tp_clear*/
0, /*tp_richcompare*/
0, /*tp_weaklistoffset*/
0, /*tp_iter*/
0, /*tp_iternext*/
context_methods, /*tp_methods*/
0, /*tp_members*/
context_getsetlist, /*tp_getset*/
0, /*tp_base*/
0, /*tp_dict*/
0, /*tp_descr_get*/
0, /*tp_descr_set*/
0, /*tp_dictoffset*/
0, /*tp_init*/
0, /*tp_alloc*/
context_new, /*tp_new*/
};
#ifdef HAVE_OPENSSL_RAND
/* helper routines for seeding the SSL PRNG */
@ -1598,8 +1758,6 @@ fails or if it does provide enough data to seed PRNG.");
/* List of functions exported by this module. */
static PyMethodDef PySSL_methods[] = {
{"sslwrap", PySSL_sslwrap,
METH_VARARGS, ssl_doc},
{"_test_decode_cert", PySSL_test_decode_certificate,
METH_VARARGS},
#ifdef HAVE_OPENSSL_RAND
@ -1708,7 +1866,9 @@ PyInit__ssl(void)
unsigned int major, minor, fix, patch, status;
PySocketModule_APIObject *socket_api;
if (PyType_Ready(&PySSL_Type) < 0)
if (PyType_Ready(&PySSLContext_Type) < 0)
return NULL;
if (PyType_Ready(&PySSLSocket_Type) < 0)
return NULL;
m = PyModule_Create(&_sslmodule);
@ -1741,8 +1901,11 @@ PyInit__ssl(void)
return NULL;
if (PyDict_SetItemString(d, "SSLError", PySSLErrorObject) != 0)
return NULL;
if (PyDict_SetItemString(d, "SSLType",
(PyObject *)&PySSL_Type) != 0)
if (PyDict_SetItemString(d, "_SSLContext",
(PyObject *)&PySSLContext_Type) != 0)
return NULL;
if (PyDict_SetItemString(d, "_SSLSocket",
(PyObject *)&PySSLSocket_Type) != 0)
return NULL;
PyModule_AddIntConstant(m, "SSL_ERROR_ZERO_RETURN",
PY_SSL_ERROR_ZERO_RETURN);