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An error occurred in an `OpenSSL.SSL` API.
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A base class for wrapper classes that allow for intelligent exception
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context where they could not be raised in the normal way. Typically
this is because OpenSSL has called into some Python code and requires a
return value. The exceptions are saved to be raised later when it is
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Raise an exception from the OpenSSL error queue or that was previously
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Wrap a callback such that it can be used as an NPN advertisement callback.
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Wrap a callback such that it can be used as an NPN selection callback.
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Wrap a callback such that it can be used as an ALPN selection callback.
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Wrap a callback such that it can be used as an OCSP callback for the server
side.
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hand it to OpenSSL, and may return only SSL_TLSEXT_ERR_OK,
SSL_TLSEXT_ERR_FATAL, and SSL_TLSEXT_ERR_NOACK. For clients, that callback
is expected to check the OCSP data, and returns a negative value on error,
0 if the response is not acceptable, or positive if it is. These are
mutually exclusive return code behaviours, and they mean that we need two
helpers so that we always return an appropriate error code if the user's
code throws an exception.
Given that we have to have two helpers anyway, these helpers are a bit more
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functions so that the user has an easier time writing these callbacks.
This helper implements the server side.
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Wrap a callback such that it can be used as an OCSP callback for the client
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helpers so that we always return an appropriate error code if the user's
code throws an exception.
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helpery than most: specifically, they hide a few more of the OpenSSL
functions so that the user has an easier time writing these callbacks.
This helper implements the client side.
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Return a string describing the version of OpenSSL in use.
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Builds a decorator that ensures that functions that rely on OpenSSL
functions that are not present in this build raise NotImplementedError,
rather than AttributeError coming out of cryptography.
:param flag: A cryptography flag that guards the functions, e.g.
``Cryptography_HAS_NEXTPROTONEG``.
:param error: The string to be used in the exception if the flag is false.
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A class representing an SSL session. A session defines certain connection
parameters which may be re-used to speed up the setup of subsequent
connections.
.. versionadded:: 0.14
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:class:`OpenSSL.SSL.Context` instances define the parameters for setting
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Let SSL know where we can find trusted certificates for the certificate
chain. Note that the certificates have to be in PEM format.
If capath is passed, it must be a directory prepared using the
``c_rehash`` tool included with OpenSSL. Either, but not both, of
*pemfile* or *capath* may be :data:`None`.
:param cafile: In which file we can find the certificates (``bytes`` or
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Set the passphrase callback. This function will be called
when a private key with a passphrase is loaded.
:param callback: The Python callback to use. This must accept three
positional arguments. First, an integer giving the maximum length
of the passphrase it may return. If the returned passphrase is
longer than this, it will be truncated. Second, a boolean value
which will be true if the user should be prompted for the
passphrase twice and the callback should verify that the two values
supplied are equal. Third, the value given as the *userdata*
parameter to :meth:`set_passwd_cb`. The *callback* must return
a byte string. If an error occurs, *callback* should return a false
value (e.g. an empty string).
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Specify that the platform provided CA certificates are to be used for
verification purposes. This method has some caveats related to the
binary wheels that cryptography (pyOpenSSL's primary dependency) ships:
* macOS will only load certificates using this method if the user has
the ``openssl@1.1`` `Homebrew <https://brew.sh>`_ formula installed
in the default location.
* Windows will not work.
* manylinux1 cryptography wheels will work on most common Linux
distributions in pyOpenSSL 17.1.0 and above. pyOpenSSL detects the
manylinux1 wheel and attempts to load roots via a fallback path.
:return: None
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Check to see if the default cert dir/file environment vars are present.
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Default verify paths are based on the compiled version of OpenSSL.
However, when pyca/cryptography is compiled as a manylinux1 wheel
that compiled location can potentially be wrong. So, like Go, we
will try a predefined set of paths and attempt to load roots
from there.
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Load a certificate chain from a file.
:param certfile: The name of the certificate chain file (``bytes`` or
``unicode``). Must be PEM encoded.
:return: None
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Load a certificate from a file
:param certfile: The name of the certificate file (``bytes`` or
``unicode``).
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:return: None
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Load a certificate from a X509 object
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Add certificate to chain
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Load a private key from a file
:param keyfile: The name of the key file (``bytes`` or ``unicode``)
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:return: None
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Load a private key from a PKey object
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Load the trusted certificates that will be sent to the client. Does
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Set the session id to *buf* within which a session can be reused for
this Context object. This is needed when doing session resumption,
because there is no way for a stored session to know which Context
object it is associated with.
:param bytes buf: The session id.
:returns: None
�bufru N)r r� r� Z SSL_CTX_set_session_id_contextr� r� )r� r rs rs rt �set_session_id s
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Set the behavior of the session cache used by all connections using
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:returns: The previously set caching mode.
.. versionadded:: 0.14
zmode must be an integer)r� r r� r� Z SSL_CTX_set_session_cache_moder� )r� �moders rs rt �set_session_cache_mode s
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Get the current session cache mode.
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.. versionadded:: 0.14
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et the verification flags for this Context object to *mode* and specify
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:param mode: The verify mode, this should be one of
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:const:`VERIFY_PEER` is used, *mode* can be OR:ed with
:const:`VERIFY_FAIL_IF_NO_PEER_CERT` and
:const:`VERIFY_CLIENT_ONCE` to further control the behaviour.
:param callback: The Python callback to use. This should take five
arguments: A Connection object, an X509 object, and three integer
variables, which are in turn potential error number, error depth
and return code. *callback* should return True if verification
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See SSL_CTX_set_verify(3SSL) for further details.
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Set the maximum depth for the certificate chain verification that shall
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Retrieve the Context object's verify mode, as set by
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Load parameters for Ephemeral Diffie-Hellman
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� rN) r� r� Z BIO_new_filer� r� r� r� ZBIO_freeZPEM_read_bio_DHparamsZDH_freeZSSL_CTX_set_tmp_dhr� )r� Zdhfile�bioZdhrs rs rt � load_tmp_dhr s
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Select a curve to use for ECDHE key exchange.
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N)r� ZSSL_CTX_set_tmp_ecdhr� Z
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Set the list of ciphers to be used in this context.
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Set the list of preferred client certificate signers for this server
context.
This list of certificate authorities will be sent to the client when
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.. versionadded:: 0.10
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Add the CA certificate to the list of preferred signers for this
context.
The list of certificate authorities will be sent to the client when the
server requests a client certificate.
:param certificate_authority: certificate authority's X509 certificate.
:return: None
.. versionadded:: 0.10
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Set the timeout for newly created sessions for this Context object to
*timeout*. The default value is 300 seconds. See the OpenSSL manual
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:return: The previous session timeout
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Set the information callback to *callback*. This function will be
called from time to time during SSL handshakes.
:param callback: The Python callback to use. This should take three
arguments: a Connection object and two integers. The first integer
specifies where in the SSL handshake the function was called, and
the other the return code from a (possibly failed) internal
function call.
:return: None
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Get the application data (supplied via :meth:`set_app_data()`)
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Set the application data (will be returned from get_app_data())
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Get the certificate store for the context. This can be used to add
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N)r� ZSSL_CTX_get_cert_storer� r� r� r �__new__Z_store)r� ZstoreZpystorers rs rt �get_cert_store& s
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Add options. Options set before are not cleared!
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Add modes via bitmask. Modes set before are not cleared! This method
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Specify a callback function to be called when clients specify a server
name.
:param callback: The callback function. It will be invoked with one
argument, the Connection instance.
.. versionadded:: 0.13
c s � t j| � dS )Nr )rn r� )r� Zalertr� )r� rs rt r� \ s z7Context.set_tlsext_servername_callback.<locals>.wrapperz int (*)(SSL *, int *, void *)N)r r� r� r� r� Z&SSL_CTX_set_tlsext_servername_callbackr� )r� r� r� rs )r� rt � set_tlsext_servername_callbackQ s
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Enable support for negotiating SRTP keying material.
:param bytes profiles: A colon delimited list of protection profile
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Specify a callback function that will be called when offering `Next
Protocol Negotiation
<https://technotes.googlecode.com/git/nextprotoneg.html>`_ as a server.
:param callback: The callback function. It will be invoked with one
argument, the :class:`Connection` instance. It should return a
list of bytestrings representing the advertised protocols, like
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.. versionadded:: 0.15
N) r� r� r� r� r� Z%SSL_CTX_set_next_protos_advertised_cbr� r� r� )r� r� rs rs rt �set_npn_advertise_callbacku s
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Specify a callback function that will be called when a server offers
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:param callback: The callback function. It will be invoked with two
arguments: the Connection, and a list of offered protocols as
bytestrings, e.g. ``[b'http/1.1', b'spdy/2']``. It should return
one of those bytestrings, the chosen protocol.
.. versionadded:: 0.15
N) r� r� r� r� r� Z SSL_CTX_set_next_proto_select_cbr� r� r� )r� r� rs rs rt �set_npn_select_callback� s
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Specify the protocols that the client is prepared to speak after the
TLS connection has been negotiated using Application Layer Protocol
Negotiation.
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protocols to offer, e.g. ``[b'http/1.1', b'spdy/2']``.
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Specify a callback function that will be called on the server when a
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arguments: the Connection, and a list of offered protocols as
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This internal helper does the common work for
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Set a callback to provide OCSP data to be stapled to the TLS handshake
on the server side.
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arguments: the Connection, and the optional arbitrary data you have
provided. The callback must return a bytestring that contains the
OCSP data to staple to the handshake. If no OCSP data is available
for this connection, return the empty bytestring.
:param data: Some opaque data that will be passed into the callback
function when called. This can be used to avoid needing to do
complex data lookups or to keep track of what context is being
used. This parameter is optional.
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Set a callback to validate OCSP data stapled to the TLS handshake on
the client side.
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arguments: the Connection, a bytestring containing the stapled OCSP
assertion, and the optional arbitrary data you have provided. The
callback must return a boolean that indicates the result of
validating the OCSP data: ``True`` if the OCSP data is valid and
the certificate can be trusted, or ``False`` if either the OCSP
data is invalid or the certificate has been revoked.
:param data: Some opaque data that will be passed into the callback
function when called. This can be used to avoid needing to do
complex data lookups or to keep track of what context is being
used. This parameter is optional.
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Switch this connection to a new session context.
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Retrieve the servername extension value if provided in the client hello
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.. versionadded:: 0.13
N)r� ZSSL_get_servernamerN ZTLSEXT_NAMETYPE_host_namer� r� r� )r� r� rs rs rt �get_servername� s
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Set the value of the servername extension to send in the client hello.
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.. versionadded:: 0.13
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Get the number of bytes that can be safely read from the SSL buffer
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Send data on the connection. NOTE: If you get one of the WantRead,
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method again with the SAME buffer.
:param buf: The string, buffer or memoryview to send
:param flags: (optional) Included for compatibility with the socket
API, the value is ignored
:return: The number of bytes written
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Send "all" data on the connection. This calls send() repeatedly until
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Receive data on the connection.
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Receive data on the connection and copy it directly into the provided
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buffer. If not present, defaults to the size of the buffer. If
larger than the size of the buffer, is reduced to the size of the
buffer.
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If the Connection was created with a memory BIO, this method can be
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If the Connection was created with a memory BIO, this method can be
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Perform an SSL handshake (usually called after :meth:`renegotiate` or
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Check if there's a renegotiation in progress, it will return False once
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Call the :meth:`connect` method of the underlying socket and set up SSL
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Call the :meth:`connect_ex` method of the underlying socket and set up
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Call the :meth:`accept` method of the underlying socket and set up SSL
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:return: A *(conn, addr)* pair where *conn* is the new
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Send the shutdown message to the Connection.
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have sent closure alerts), False otherwise (in which case you
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Get CAs whose certificates are suggested for client authentication.
:return: If this is a server connection, the list of certificate
authorities that will be sent or has been sent to the client, as
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If this is a client connection, the list will be empty until the
connection with the server is established.
.. versionadded:: 0.10
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Set application data
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Get the shutdown state of the Connection.
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Set the shutdown state of the Connection.
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Retrieve a verbose string detailing the state of the Connection.
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Retrieve the random value used with the server hello message.
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Retrieve the random value used with the client hello message.
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Obtain keying material for application use.
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Call the :meth:`shutdown` method of the underlying socket.
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:return: What the socket's shutdown() method returns
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N)r� ZSSL_get_certificaterN r� r� r� r r� )r� r� rs rs rt �get_certificate� s
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Retrieve the other side's certificate (if any)
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Retrieve the other side's certificate (if any)
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Checks if more data has to be read from the transport layer to complete
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Checks if there is data to write to the transport layer to complete an
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Set the connection to work in server mode. The handshake will be
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Set the connection to work in client mode. The handshake will be
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Returns the Session currently used.
:return: An instance of :class:`OpenSSL.SSL.Session` or
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.. versionadded:: 0.14
N)
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Set the session to be used when the TLS/SSL connection is established.
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.. versionadded:: 0.14
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Helper to implement :meth:`get_finished` and
:meth:`get_peer_finished`.
:param function: Either :data:`SSL_get_finished`: or
:data:`SSL_get_peer_finished`.
:return: :data:`None` if the desired message has not yet been
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Obtain the latest TLS Finished message that we sent.
:return: The contents of the message or :obj:`None` if the TLS
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:rtype: :class:`bytes` or :class:`NoneType`
.. versionadded:: 0.15
)r� r� ZSSL_get_finished)r� rs rs rt � get_finished s
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Obtain the latest TLS Finished message that we received from the peer.
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:rtype: :class:`bytes` or :class:`NoneType`
.. versionadded:: 0.15
)r� r� ZSSL_get_peer_finished)r� rs rs rt �get_peer_finished( s
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Obtain the name of the currently used cipher.
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.. versionadded:: 0.15
Nzutf-8)r� �SSL_get_current_cipherrN r� r� r� ZSSL_CIPHER_get_namer� )r� �cipherr� rs rs rt �get_cipher_name4 s
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Obtain the number of secret bits of the currently used cipher.
:returns: The number of secret bits of the currently used cipher
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:rtype: :class:`int` or :class:`NoneType`
.. versionadded:: 0.15
N)r� r� rN r� r� ZSSL_CIPHER_get_bits)r� r� rs rs rt �get_cipher_bitsE s
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Obtain the protocol version of the currently used cipher.
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:rtype: :class:`unicode` or :class:`NoneType`
.. versionadded:: 0.15
Nzutf-8)r� r� rN r� r� r� ZSSL_CIPHER_get_versionr� )r� r� �versionrs rs rt �get_cipher_versionU s
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Retrieve the protocol version of the current connection.
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Retrieve the SSL or TLS protocol version of the current connection.
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Get the protocol that was negotiated by NPN.
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.. versionadded:: 0.15
zunsigned char **zunsigned int *r N)r� r� r� Z SSL_get0_next_proto_negotiatedrN r� )r� r� �data_lenrs rs rt �get_next_proto_negotiated} s
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Specify the client's ALPN protocol list.
These protocols are offered to the server during protocol negotiation.
:param protos: A list of the protocols to be offered to the server.
This list should be a Python list of bytestrings representing the
protocols to offer, e.g. ``[b'http/1.1', b'spdy/2']``.
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Get the protocol that was negotiated by ALPN.
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Called to request that the server sends stapled OCSP data, if
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