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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_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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compatibility.
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the underlying OS socket in an SSL context when necessary, and
provides read and write methods over that channel.NFTr c C sD | r | | _ n| r. | r. t d � � n | rJ | rJ t d � � n | r` | r` | } n t | � | _ | | j _ | r� | j j | � n | r� | j j | | � n | r� | j j | � n | r� | j j | � n | | _ | | _ | | _
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r<| j* � � Yq@Xn d S)Nz5certfile must be specified for server-side operationszcertfile must be specifiedz!only stream sockets are supportedz4server_hostname can only be specified in client modez'check_hostname requires server_hostname�family�type�proto�filenoFTg zHdo_handshake_on_connect should not be specified for non-blocking sockets)+r� rM rq r� r� r� r� rw r� r� r� � ssl_version�ca_certs�ciphersZ
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zSSLSocket.__init__c C s | j S)N)r� )r{ r r r r� R s zSSLSocket.contextc C s | | _ | | j _ d S)N)r� r� r� )r{ Zctxr r r r� V s c C s t d | j j � � d S)NzCan't dup() %s instances)�NotImplementedrg r9 )r{ r r r �dup[ s z
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r� } z; | j d t k r� | j r� | d k r� d Sd Sn � WYd d } ~ Xn Xd S)zORead up to LEN bytes and return them.
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number of bytes of DATA actually transmitted.z(Write on closed or unwrapped SSL socket.)r� r� rM �write)r{ �datar r r r� � s
zSSLSocket.writec C s$ | j � | j � | j j | � S)z�Returns a formatted version of the data in the
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zSSLSocket.getpeercertc C s3 | j � | j s t j r" d S| j j � Sd S)N)r� r� r r% �selected_npn_protocol)r{ r r r r� � s
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zSSLSocket.sendtoc O s t d | j � � d S)Nz&sendmsg not allowed on instances of %s)r� rg )r{ ry rz r r r �sendmsg� s zSSLSocket.sendmsgc C s� | j � | j r� | d k r5 t d | j � � n t | � } d } x3 | | k r| | j | | d � � } | | 7} qJ W| St j | | | � Sd S)Nr z6non-zero flags not allowed in calls to sendall() on %s)r� r� rM rg rO r� r2 �sendall)r{ r� r� Zamountr@ r� r r r r� � s
zSSLSocket.sendalli c C sY | j � | j rB | d k r5 t d | j � � n | j | � St j | | | � Sd S)Nr z3non-zero flags not allowed in calls to recv() on %s)r� r� rM rg r� r2 �recv)r{ �buflenr� r r r r� � s
zSSLSocket.recvc C s� | j � | r+ | d k r+ t | � } n | d k r@ d } n | j r{ | d k rk t d | j � � n | j | | � St j | | | | � Sd S)Ni r z8non-zero flags not allowed in calls to recv_into() on %s)r� rO r� rM rg r� r2 � recv_into)r{ r� �nbytesr� r r r r� � s
zSSLSocket.recv_intoc C s@ | j � | j r) t d | j � � n t j | | | � Sd S)Nz'recvfrom not allowed on instances of %s)r� r� rM rg r2 �recvfrom)r{ r� r� r r r r� � s
zSSLSocket.recvfromc C sC | j � | j r) t d | j � � n t j | | | | � Sd S)Nz,recvfrom_into not allowed on instances of %s)r� r� rM rg r2 �
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� rg )r{ ry rz r r r �recvmsg s zSSLSocket.recvmsgc O s t d | j � � d S)Nz+recvmsg_into not allowed on instances of %s)r� rg )r{ ry rz r r r � recvmsg_into s zSSLSocket.recvmsg_intoc C s( | j � | j r | j j � Sd Sd S)Nr )r� r� �pending)r{ r r r r� s
zSSLSocket.pendingc C s' | j � d | _ t j | | � d S)N)r� r� r2 �shutdown)r{ Zhowr r r r� s
zSSLSocket.shutdownc C s? | j r% | j j � } d | _ | St d t | � � � d S)NzNo SSL wrapper around )r� r� rM �str)r{ �sr r r �unwrap s
zSSLSocket.unwrapc C s d | _ t j | � d S)N)r� r2 � _real_close)r{ r r r r� $ s zSSLSocket._real_closec C s� | j � | j � } z3 | d k r; | r; | j d � n | j j � Wd | j | � X| j j r� | j s~ t d � � n t | j
� | j � n d S)z Perform a TLS/SSL handshake.g Nz-check_hostname needs server_hostname argument) r� r� r� r� r� r� r� r� rM rT r� )r{ �blockr� r r r r� ( s
zSSLSocket.do_handshakec C s� | j r t d � � n | j r0 t d � � n | j j | d | j � | _ ya | rl t j | | � } n d } t j | | � | s� d | _ | j
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r� d | _ � Yn Xd S)Nz!can't connect in server-side modez/attempt to connect already-connected SSLSocket!FT)
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