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This module provides some more Pythonic support for SSL.
Object types:
SSLSocket -- subtype of socket.socket which does SSL over the socket
Exceptions:
SSLError -- exception raised for I/O errors
Functions:
cert_time_to_seconds -- convert time string used for certificate
notBefore and notAfter functions to integer
seconds past the Epoch (the time values
returned from time.time())
fetch_server_certificate (HOST, PORT) -- fetch the certificate provided
by the server running on HOST at port PORT. No
validation of the certificate is performed.
Integer constants:
SSL_ERROR_ZERO_RETURN
SSL_ERROR_WANT_READ
SSL_ERROR_WANT_WRITE
SSL_ERROR_WANT_X509_LOOKUP
SSL_ERROR_SYSCALL
SSL_ERROR_SSL
SSL_ERROR_WANT_CONNECT
SSL_ERROR_EOF
SSL_ERROR_INVALID_ERROR_CODE
The following group define certificate requirements that one side is
allowing/requiring from the other side:
CERT_NONE - no certificates from the other side are required (or will
be looked at if provided)
CERT_OPTIONAL - certificates are not required, but if provided will be
validated, and if validation fails, the connection will
also fail
CERT_REQUIRED - certificates are required, and will be validated, and
if validation fails, the connection will also fail
The following constants identify various SSL protocol variants:
PROTOCOL_SSLv2
PROTOCOL_SSLv3
PROTOCOL_SSLv23
PROTOCOL_TLS
PROTOCOL_TLS_CLIENT
PROTOCOL_TLS_SERVER
PROTOCOL_TLSv1
PROTOCOL_TLSv1_1
PROTOCOL_TLSv1_2
The following constants identify various SSL alert message descriptions as per
http://www.iana.org/assignments/tls-parameters/tls-parameters.xml#tls-parameters-6
ALERT_DESCRIPTION_CLOSE_NOTIFY
ALERT_DESCRIPTION_UNEXPECTED_MESSAGE
ALERT_DESCRIPTION_BAD_RECORD_MAC
ALERT_DESCRIPTION_RECORD_OVERFLOW
ALERT_DESCRIPTION_DECOMPRESSION_FAILURE
ALERT_DESCRIPTION_HANDSHAKE_FAILURE
ALERT_DESCRIPTION_BAD_CERTIFICATE
ALERT_DESCRIPTION_UNSUPPORTED_CERTIFICATE
ALERT_DESCRIPTION_CERTIFICATE_REVOKED
ALERT_DESCRIPTION_CERTIFICATE_EXPIRED
ALERT_DESCRIPTION_CERTIFICATE_UNKNOWN
ALERT_DESCRIPTION_ILLEGAL_PARAMETER
ALERT_DESCRIPTION_UNKNOWN_CA
ALERT_DESCRIPTION_ACCESS_DENIED
ALERT_DESCRIPTION_DECODE_ERROR
ALERT_DESCRIPTION_DECRYPT_ERROR
ALERT_DESCRIPTION_PROTOCOL_VERSION
ALERT_DESCRIPTION_INSUFFICIENT_SECURITY
ALERT_DESCRIPTION_INTERNAL_ERROR
ALERT_DESCRIPTION_USER_CANCELLED
ALERT_DESCRIPTION_NO_RENEGOTIATION
ALERT_DESCRIPTION_UNSUPPORTED_EXTENSION
ALERT_DESCRIPTION_CERTIFICATE_UNOBTAINABLE
ALERT_DESCRIPTION_UNRECOGNIZED_NAME
ALERT_DESCRIPTION_BAD_CERTIFICATE_STATUS_RESPONSE
ALERT_DESCRIPTION_BAD_CERTIFICATE_HASH_VALUE
ALERT_DESCRIPTION_UNKNOWN_PSK_IDENTITY
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|||� n|jt kr`|j | � |S )z�Create a SSLContext object with default settings.
NOTE: The protocol and settings may change anytime without prior
deprecation. The values represent a fair balance between maximum
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CERT_REQUIREDr� �check_hostnamer� � CERT_NONEr� )r� rd re r� �contextr$ r$ r% �create_default_context� s
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C s� t |t�st|��t| �} |s$d| _|dk r2|| _|r<d| _|rN| rNtd��|sV|rb| j||� |sn|sn|r~| j|||� n| jt kr�| j
|� | S )a/ Create a SSLContext object for Python stdlib modules
All Python stdlib modules shall use this function to create SSLContext
objects in order to keep common settings in one place. The configuration
is less restrict than create_default_context()'s to increase backward
compatibility.
FNTzcertfile must be specified) r� rf r� rv r� r� rQ �load_cert_chainr� r� r� )
rw r� r� r� r� r� rd re r� r� r$ r$ r% �_create_unverified_context� s$
r� c @ s� e Zd ZdZd0dd�Zedd� �Zejdd� �Zedd � �Zejd
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d2dd�Zdd� Zdd � Zd d � Zd d � Zd!d"� Zd#d$� Zd%d&� Zd'd(� Zd3d*d+�Zd,d-� Zd.d/� ZdS )4r� a This class implements an interface on top of a low-level SSL object as
implemented by OpenSSL. This object captures the state of an SSL connection
but does not provide any network IO itself. IO needs to be performed
through separate "BIO" objects which are OpenSSL's IO abstraction layer.
This class does not have a public constructor. Instances are returned by
``SSLContext.wrap_bio``. This class is typically used by framework authors
that want to implement asynchronous IO for SSL through memory buffers.
When compared to ``SSLSocket``, this object lacks the following features:
* Any form of network IO, including methods such as ``recv`` and ``send``.
* The ``do_handshake_on_connect`` and ``suppress_ragged_eofs`` machinery.
Nc C s& || _ |p | | j _|d k r"|| j _d S )N)�_sslobj�ownerr� )r} r� r� r� r$ r$ r% r~ s zSSLObject.__init__c C s | j jS )z(The SSLContext that is currently in use.)r� r� )r} r$ r$ r% r� % s zSSLObject.contextc C s || j _d S )N)r� r� )r} �ctxr$ r$ r% r� * s c C s | j jS )z!The SSLSession for client socket.)r� r� )r} r$ r$ r% r� . s zSSLObject.sessionc C s || j _d S )N)r� r� )r} r� r$ r$ r% r� 3 s c C s | j jS )z.Was the client session reused during handshake)r� �session_reused)r} r$ r$ r% r� 7 s zSSLObject.session_reusedc C s | j jS )z%Whether this is a server-side socket.)r� r� )r} r$ r$ r% r� < s zSSLObject.server_sidec C s | j jS )z]The currently set server hostname (for SNI), or ``None`` if no
server hostame is set.)r� r� )r} r$ r$ r% r� A s zSSLObject.server_hostname� c C s( |dk r| j j||�}n | j j|�}|S )z�Read up to 'len' bytes from the SSL object and return them.
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| j j� S )z_Return the currently selected cipher as a 3-tuple ``(name,
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| j j� S )z�Return a list of ciphers shared by the client during the handshake or
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| j j� S )z�Return the current compression algorithm in use, or ``None`` if
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| j j� S )z8Return the number of bytes that can be read immediately.)r� �pending)r} r$ r$ r% r� � s zSSLObject.pendingc C s4 | j j� | jjr0| js td��t| j� | j� dS )z Start the SSL/TLS handshake.z-check_hostname needs server_hostname argumentN)r� � do_handshaker� r� r� rQ rX r� )r} r$ r$ r% r� � s
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| j j� S )z!Start the SSL shutdown handshake.)r� �shutdown)r} r$ r$ r% �unwrap� s zSSLObject.unwrap�
tls-uniquec C s0 |t krtd��|dkr&tdj|���| jj� S )z�Get channel binding data for current connection. Raise ValueError
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tls-uniquez({0} channel binding type not implemented)�CHANNEL_BINDING_TYPESrQ �NotImplementedError�formatr� Z
tls_unique_cb)r} �cb_typer$ r$ r% �get_channel_binding� s z SSLObject.get_channel_bindingc C s
| j j� S )zZReturn a string identifying the protocol version used by the
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| j j� S )N)r� � verify_client_post_handshake)r} r$ r$ r% r� � s z&SSLObject.verify_client_post_handshake)NN)r� N)F)r� )r8 r9 r: rp r~ r� r� r� r� r� r� r� r� r� r� r� r� r� r� r� r� r� r� r� r� r� r$ r$ r$ r% r� s.
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dd� ZdVdd�Zdd� ZdWdd�Zdd� ZdXdd �Zd d � Zd d � Zd!d"� Zd#d$� Zd%d&� ZdYd'd(�ZdZd)d*�Zd+d,� Zd[d-d.�Z d\� fd/d0� Z d]d1d2�Z d^d3d4�Z d_d5d6�Z d`d7d8�Z!d9d:� Z"d;d<� Z#d=d>� Z$d?d@� Z%dAdB� Z&dCdD� Z'dEdF� Z(dadGdH�Z)dIdJ� Z*dKdL� Z+dMdN� Z,dOdP� Z-dbdRdS�Z.dTdU� Z/� Z0S )cr� z�This class implements a subtype of socket.socket that wraps
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_connected� _wrap_socketr� r� ) r} r r� r� r� r� r� r� r� r� r� r� r� r� r� r� r� r� r� Z sock_timeout�eZ connectedZblockingZnotconn_pre_handshake_datar� Z notconn_pre_handshake_data_errorr� �timeoutr$ r$ r% r~ � s�
zSSLSocket.__init__c C s | j S )N)r� )r} r$ r$ r% r� 0 s zSSLSocket.contextc C s || _ || j_d S )N)r� r� r� )r} r� r$ r$ r% r� 4 s c C s | j dk r| j jS dS )z!The SSLSession for client socket.N)r� r� )r} r$ r$ r% r� 9 s
zSSLSocket.sessionc C s || _ | jd k r|| j_d S )N)r� r� r� )r} r� r$ r$ r% r� ? s
c C s | j dk r| j jS dS )z.Was the client session reused during handshakeN)r� r� )r} r$ r$ r% r� E s
zSSLSocket.session_reusedc C s t d| jj ��d S )NzCan't dup() %s instances)r� rl r8 )r} r$ r$ r% �dupK s z
SSLSocket.dupc C s d S )Nr$ )r} �msgr$ r$ r% � _checkClosedO s zSSLSocket._checkClosedc C s | j s| j� d S )N)r� r� )r} r$ r$ r% �_check_connectedS s zSSLSocket._check_connected� c C st | j � | jstd��y| jj||�S tk
rn } z.|jd tkr\| jr\|dk rVdS dS n� W Y dd}~X nX dS )zORead up to LEN bytes and return them.
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SSL_ERROR_EOFr� )r} rS r� �xr$ r$ r% r� [ s zSSLSocket.readc C s" | j � | jstd��| jj|�S )zhWrite DATA to the underlying SSL channel. Returns
number of bytes of DATA actually transmitted.z(Write on closed or unwrapped SSL socket.)r� r� rQ r� )r} r� r$ r$ r% r� m s zSSLSocket.writec C s | j � | j� | jj|�S )z�Returns a formatted version of the data in the
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certificate was provided, but not validated.)r� r� r� r� )r} r� r$ r$ r% r� v s zSSLSocket.getpeercertc C s* | j � | j stj r d S | jj� S d S )N)r� r� r\ r r� )r} r$ r$ r% r� � s z SSLSocket.selected_npn_protocolc C s* | j � | j stj r d S | jj� S d S )N)r� r� r\ r r� )r} r$ r$ r% r� � s z SSLSocket.selected_alpn_protocolc C s | j � | jsd S | jj� S d S )N)r� r� r� )r} r$ r$ r% r� � s zSSLSocket.cipherc C s | j � | jsd S | jj� S )N)r� r� r� )r} r$ r$ r% r� � s zSSLSocket.shared_ciphersc C s | j � | jsd S | jj� S d S )N)r� r� r� )r} r$ r$ r% r� � s zSSLSocket.compressionc C sB | j � | jr0|dkr$td| j ��| jj|�S tj| ||�S d S )Nr z3non-zero flags not allowed in calls to send() on %s)r� r� rQ rl r� r1 �send)r} r� �flagsr$ r$ r% r� � s
zSSLSocket.sendc C sH | j � | jr td| j ��n&|d kr4tj| ||�S tj| |||�S d S )Nz%sendto not allowed on instances of %s)r� r� rQ rl r1 �sendto)r} r� Z
flags_or_addr�addrr$ r$ r% r� � s zSSLSocket.sendtoc O s t d| j ��d S )Nz&sendmsg not allowed on instances of %s)r� rl )r} r{ r| r$ r$ r% �sendmsg� s zSSLSocket.sendmsgc C s� | j � | jr�|dkr$td| j ��d}t|��L}|jd��6}t|�}x&||k rl| j||d � �}||7 }qHW W d Q R X W d Q R X ntj | ||�S d S )Nr z6non-zero flags not allowed in calls to sendall() on %s�B)
r� r� rQ rl �
memoryview�castrS r� r1 �sendall)r} r� r� r? ZviewZ byte_viewZamountr� r$ r$ r% r� � s
"zSSLSocket.sendallc s, | j dkrt� j|||�S | j|||�S dS )z�Send a file, possibly by using os.sendfile() if this is a
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N)r� rg �sendfileZ_sendfile_use_send)r} �file�offsetr? )rl r$ r% r� � s
zSSLSocket.sendfilec C s@ | j � | jr.|dkr$td| j ��| j|�S tj| ||�S d S )Nr z3non-zero flags not allowed in calls to recv() on %s)r� r� rQ rl r� r1 r� )r} �buflenr� r$ r$ r% r� � s
zSSLSocket.recvc C sf | j � |r |d kr t|�}n |d kr*d}| jrR|dkrFtd| j ��| j||�S tj| |||�S d S )Ni r z8non-zero flags not allowed in calls to recv_into() on %s)r� rS r� rQ rl r� r1 � recv_into)r} r� �nbytesr� r$ r$ r% r� � s
zSSLSocket.recv_intoc C s0 | j � | jr td| j ��ntj| ||�S d S )Nz'recvfrom not allowed on instances of %s)r� r� rQ rl r1 �recvfrom)r} r� r� r$ r$ r% r� � s
zSSLSocket.recvfromc C s2 | j � | jr td| j ��ntj| |||�S d S )Nz,recvfrom_into not allowed on instances of %s)r� r� rQ rl r1 �
recvfrom_into)r} r� r� r� r$ r$ r% r� � s
zSSLSocket.recvfrom_intoc O s t d| j ��d S )Nz&recvmsg not allowed on instances of %s)r� rl )r} r{ r| r$ r$ r% �recvmsg s zSSLSocket.recvmsgc O s t d| j ��d S )Nz+recvmsg_into not allowed on instances of %s)r� rl )r} r{ r| r$ r$ r% � recvmsg_into s zSSLSocket.recvmsg_intoc C s | j � | jr| jj� S dS d S )Nr )r� r� r� )r} r$ r$ r% r� s
zSSLSocket.pendingc C s | j � d | _tj| |� d S )N)r� r� r1 r� )r} Zhowr$ r$ r% r� s zSSLSocket.shutdownc C s. | j r| j j� }d | _ |S tdt| � ��d S )NzNo SSL wrapper around )r� r� rQ �str)r} �sr$ r$ r% r� s
zSSLSocket.unwrapc C s$ | j r| j j� S tdt| � ��d S )NzNo SSL wrapper around )r� r� rQ r )r} r$ r$ r% r� s
z&SSLSocket.verify_client_post_handshakec C s d | _ tj| � d S )N)r� r1 � _real_close)r} r$ r$ r% r # s zSSLSocket._real_closec C sF | j � | j� }z$|dkr(|r(| jd� | jj� W d| j|� X dS )z Perform a TLS/SSL handshake.g N)r� r� r� r� r� )r} �blockr� r$ r$ r% r� ' s
zSSLSocket.do_handshakec C s� | j rtd��| jr td��| jj| d| j�}t|| | jd�| _y>|rTt j
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r� d | _� Y nX d S )Nz!can't connect in server-side modez/attempt to connect already-connected SSLSocket!F)r� r� T)r� rQ r� r� r� r� r� r� r� r1 �
connect_ex�connectr� r� r� )r} r� r r� Zrcr$ r$ r% �
_real_connect2 s( zSSLSocket._real_connectc C s | j |d� dS )zQConnects to remote ADDR, and then wraps the connection in
an SSL channel.FN)r )r} r� r$ r$ r% r K s zSSLSocket.connectc C s | j |d�S )zQConnects to remote ADDR, and then wraps the connection in
an SSL channel.T)r )r} r� r$ r$ r% r P s zSSLSocket.connect_exc C s. t j| �\}}| jj|| j| jdd�}||fS )z�Accepts a new connection from a remote client, and returns
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tls-uniquec C s | j dkrdS | j j|�S )z�Get channel binding data for current connection. Raise ValueError
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or None if the data is not available (e.g. before the handshake).
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z SSLSocket.get_channel_bindingc C s | j dkrdS | j j� S )z�
Return a string identifying the protocol version used by the
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zSSLSocket.version)N)r� N)F)r )N)r )r N)r� r )Nr )r� r )Nr )F)r )1r8 r9 r: rp r� r� r2 r3 r~ r� r� r� r� r� r� r� r� r� r� r� r� r� r� r� r� r� r� r� r� r� r� r� r� r� r� r r� r� r� r� r r� r r r r r� r� rs r$ r$ )rl r% r� � s` |
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rb td| |f ��Y n0X || dd� |�}||d |f|dd� �S dS )a� Return the time in seconds since the Epoch, given the timestring
representing the "notBefore" or "notAfter" date from a certificate
in ``"%b %d %H:%M:%S %Y %Z"`` strptime format (C locale).
"notBefore" or "notAfter" dates must use UTC (RFC 5280).
Month is one of: Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
UTC should be specified as GMT (see ASN1_TIME_print())
r )�strptime)�timegm�Jan�Feb�Mar�Apr�May�Jun�Jul�Aug�Sep�Oct�Nov�Decz %d %H:%M:%S %Y GMTNr[ r; z*time data %r does not match format "%%b%s"rZ � ) r r
r r r r r r r r r r )Ztimer
Zcalendarr �index�titlerQ )Z cert_timer
r ZmonthsZ time_formatZ month_numberZttr$ r$ r% �cert_time_to_seconds� s
r z-----BEGIN CERTIFICATE-----z-----END CERTIFICATE-----c C s2 t tj| �dd�}td tj|d� d t d S )z[Takes a certificate in binary DER format and returns the
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PEM_FOOTER)Zder_cert_bytes�fr$ r$ r% �DER_cert_to_PEM_cert� s r% c C s\ | j t�stdt ��| j� jt�s0tdt ��| j� tt�tt� � }tj|j dd��S )zhTakes a certificate in ASCII PEM format and returns the
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r" r! rQ �strip�endswithr# rS r Z decodebytes�encode)Zpem_cert_string�dr$ r$ r% �PEM_cert_to_DER_cert� s
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C sd | \}}|dk rt }nt}t|||d�}t| ��&}|j|��}|jd�} W dQ R X W dQ R X t| �S )z�Retrieve the certificate from the server at the specified address,
and return it as a PEM-encoded string.
If 'ca_certs' is specified, validate the server cert against it.
If 'ssl_version' is specified, use it in the connection attempt.N)r� rd T)r� r� �_create_stdlib_contextr4 r� r� r% )
r� r� r� �hostZportr� r� r ZsslsockZdercertr$ r$ r% �get_server_certificate� s
r- c C s t j| d�S )Nz <unknown>)�_PROTOCOL_NAMESrR )Z
protocol_coder$ r$ r% �get_protocol_name� s r/ )r; )brp rL r" rC r� r^ � collectionsr �enumr Z_Enumr Z_IntEnumr Z_IntFlagr\ r r r r r
r r r
r r r r r ri r rm r r r r r � ImportErrorr r r r r r r �_convertr8 r r� r! � __members__�itemsr. �getattrZ_SSLv2_IF_EXISTSr� r/ r0 r1 r2 r3 r4 r5 r6 r r� r� r� Z socket_errorZHAS_TLS_UNIQUEr� Z_RESTRICTED_SERVER_CIPHERSrQ r7 rK rP rX rY r] rf rt rv ru r� r� r� Z _create_default_https_contextr+ r� r� r� r r! r# r% r* r- r/ r$ r$ r$ r% �<module>[ s�
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