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� =OXc @ s d Z d d l Z d d l Z d d l Z d d l Z d d l Z d d l Z d d l m Z d d l m Z d d l m Z m Z m Z m Z m Z m Z m Z d d l m Z m Z d d l m Z m Z d d l m Z d � Z d e f d � � YZ d e f d � � YZ d S( s Packet handling i����N( t HMAC( t util( t linefeed_bytet cr_byte_valuet asbytest MSG_NAMESt DEBUGt xfffffffft zero_byte( t ut byte_ord( t SSHExceptiont ProxyCommandFailure( t Messagec C s t | | | � j � S( N( R t digest( t keyt messaget digest_class( ( s3 /usr/lib/python2.7/site-packages/paramiko/packet.pyt compute_hmac' s t NeedRekeyExceptionc B s e Z RS( ( t __name__t __module__( ( ( s3 /usr/lib/python2.7/site-packages/paramiko/packet.pyR + s t Packetizerc B sR e Z d Z e d d � Z e d d � Z e d d � Z e d d � Z d � Z e d � � Z d � Z e d � Z d � Z d � Z d � Z d � Z d � Z d � Z d � Z d � Z d � Z d � Z d � Z d � Z d � Z d � Z e d � Z d � Z d � Z d � Z d � Z d � Z! d � Z" d � Z# d � Z$ d � Z% RS( s9 Implementation of the base SSH packet protocol. i i c C sT | | _ d | _ t | _ t | _ t | _ d | _ t � | _ d | _ d | _ d | _ d | _ d | _ d | _ d | _ d | _ d | _ d | _ d | _ d | _ t | _ d | _ d | _ t � | _ t � | _ d | _ d | _ d | _ d | _ t j � | _! d | _" t# j# � | _$ d | _% d | _& t | _' t | _( d S( Ni i () t _Packetizer__sockett Nonet _Packetizer__loggert Falset _Packetizer__closedt _Packetizer__dump_packetst _Packetizer__need_rekeyt _Packetizer__init_countt bytest _Packetizer__remaindert _Packetizer__sent_bytest _Packetizer__sent_packetst _Packetizer__received_bytest _Packetizer__received_packetst$ _Packetizer__received_bytes_overflowt& _Packetizer__received_packets_overflowt _Packetizer__block_size_outt _Packetizer__block_size_int _Packetizer__mac_size_outt _Packetizer__mac_size_int _Packetizer__block_engine_outt _Packetizer__block_engine_int _Packetizer__sdctr_outt _Packetizer__mac_engine_outt _Packetizer__mac_engine_int _Packetizer__mac_key_outt _Packetizer__mac_key_int _Packetizer__compress_engine_outt _Packetizer__compress_engine_int _Packetizer__sequence_number_outt _Packetizer__sequence_number_int threadingt RLockt _Packetizer__write_lockt _Packetizer__keepalive_intervalt timet _Packetizer__keepalive_lastt _Packetizer__keepalive_callbackt _Packetizer__timert _Packetizer__handshake_completet _Packetizer__timer_expired( t selft socket( ( s3 /usr/lib/python2.7/site-packages/paramiko/packet.pyt __init__< sF c C s | j S( N( R ( R@ ( ( s3 /usr/lib/python2.7/site-packages/paramiko/packet.pyt closedj s c C s | | _ d S( s? Set the Python log object to use for logging. N( R ( R@ t log( ( s3 /usr/lib/python2.7/site-packages/paramiko/packet.pyt set_logn s c C s | | _ | | _ | | _ | | _ | | _ | | _ d | _ d | _ | j d O_ | j d k r{ d | _ t | _ n d S( s. Switch outbound data cipher. i i i N( R+ R- R' R. R) R0 R! R" R R R ( R@ t block_enginet block_sizet mac_enginet mac_sizet mac_keyt sdctr( ( s3 /usr/lib/python2.7/site-packages/paramiko/packet.pyt set_outbound_ciphert s c C s� | | _ | | _ | | _ | | _ | | _ d | _ d | _ d | _ d | _ | j d O_ | j d k r� d | _ t | _ n d S( s- Switch inbound data cipher. i i i N( R, R( R/ R* R1 R# R$ R% R& R R R ( R@ RF RG RH RI RJ ( ( s3 /usr/lib/python2.7/site-packages/paramiko/packet.pyt set_inbound_cipher� s c C s | | _ d S( N( R2 ( R@ t compressor( ( s3 /usr/lib/python2.7/site-packages/paramiko/packet.pyt set_outbound_compressor� s c C s | | _ d S( N( R3 ( R@ RN ( ( s3 /usr/lib/python2.7/site-packages/paramiko/packet.pyt set_inbound_compressor� s c C s t | _ | j j � d S( N( t TrueR R t close( R@ ( ( s3 /usr/lib/python2.7/site-packages/paramiko/packet.pyRR � s c C s | | _ d S( N( R ( R@ t hexdump( ( s3 /usr/lib/python2.7/site-packages/paramiko/packet.pyt set_hexdump� s c C s | j S( N( R ( R@ ( ( s3 /usr/lib/python2.7/site-packages/paramiko/packet.pyt get_hexdump� s c C s | j S( N( R* ( R@ ( ( s3 /usr/lib/python2.7/site-packages/paramiko/packet.pyt get_mac_size_in� s c C s | j S( N( R) ( R@ ( ( s3 /usr/lib/python2.7/site-packages/paramiko/packet.pyt get_mac_size_out� s c C s | j S( s� Returns ``True`` if a new set of keys needs to be negotiated. This will be triggered during a packet read or write, so it should be checked after every read or write, or at least after every few. ( R ( R@ ( ( s3 /usr/lib/python2.7/site-packages/paramiko/packet.pyt need_rekey� s c C s% | | _ | | _ t j � | _ d S( s� Turn on/off the callback keepalive. If ``interval`` seconds pass with no data read from or written to the socket, the callback will be executed and the timer will be reset. N( R9 R< R: R; ( R@ t intervalt callback( ( s3 /usr/lib/python2.7/site-packages/paramiko/packet.pyt set_keepalive� s c C s t | _ d S( N( RQ R? ( R@ ( ( s3 /usr/lib/python2.7/site-packages/paramiko/packet.pyt read_timer� s c C s; | j s7 t j t | � | j � | _ | j j � n d S( s� Tells `Packetizer` that the handshake process started. Starts a book keeping timer that can signal a timeout in the handshake process. :param float timeout: amount of seconds to wait before timing out N( R= R6 t Timert floatR\ t start( R@ t timeout( ( s3 /usr/lib/python2.7/site-packages/paramiko/packet.pyt start_handshake� s c C s! | j s t S| j r t S| j S( sR Checks if the handshake has timed out. If `start_handshake` wasn't called before the call to this function, the return value will always be `False`. If the handshake completed before a timeout was reached, the return value will be `False` :return: handshake time out status, as a `bool` ( R= R R> R? ( R@ ( ( s3 /usr/lib/python2.7/site-packages/paramiko/packet.pyt handshake_timed_out� s c C s/ | j r+ | j j � t | _ t | _ n d S( sF Tells `Packetizer` that the handshake has completed. N( R= t cancelR R? RQ R> ( R@ ( ( s3 /usr/lib/python2.7/site-packages/paramiko/packet.pyt complete_handshake� s c C s� t � } t | j � d k rN | j | } | j | | _ | t | � 8} n x�| d k r�t } | j � r{ t � � n yN | j j | � } t | � d k r� t � � n | | 7} | t | � 8} Wn� t j k r� t } n� t j k r�} t | j � t k r@t | j � d k r@| j d t j k r@t } q�t | j � t k r�t | j � d k r�| j d t j k r�q�| j r�t � � q�� n X| rQ | j r�t � � n | r�t | � d k r�| j r�t � � n | j � qQ qQ W| S( s Read as close to N bytes as possible, blocking as long as necessary. :param int n: number of bytes to read :return: the data read, as a `str` :raises EOFError: if the socket was closed before all the bytes could be read i ( R t lenR R Rb t EOFErrorR t recvRA R` RQ t errort typet argst tuplet errnot EAGAINt EINTRR R R t _check_keepalive( R@ t nt check_rekeyt outt got_timeoutt xt e( ( s3 /usr/lib/python2.7/site-packages/paramiko/packet.pyt read_all� s@ @ @ ! c C s� t j � | _ d } x�t | � d k r�t } y | j j | � } Wn� t j k rb t } n� t j k r} t | j � t k r� t | j � d k r� | j d t j k r� t } q9t | j � t k rt | j � d k r| j d t j k rt } q9d } n* t k r"� n t k r8d } n X| rZd } | j r�d } q�n+ | d k r{| d k r{d } n | d 7} | d k r�t � � n | t | � k r�Pn | | } q Wd S( Ni i����i i ( R: R; Re R R t sendRA R` RQ Rh Ri Rj Rk Rl Rm Rn R t ExceptionR Rf ( R@ Rr t# iteration_with_zero_as_return_valuet retry_writeRp Ru ( ( s3 /usr/lib/python2.7/site-packages/paramiko/packet.pyt write_all s> @ @ c C s� | j } x# t | k r. | | j | � 7} q W| j t � } | | d | _ | | } t | � d k r� | d t k r� | d } n t | � S( s� Read a line from the socket. We assume no data is pending after the line, so it's okay to attempt large reads. i i i����( R R t _read_timeoutt indexRe R R ( R@ R` t bufRp ( ( s3 /usr/lib/python2.7/site-packages/paramiko/packet.pyt readlineD s " c C s t | � } t | d � } | t k r5 t | } n d | } t | � } | j j � z�| j d k r| | j | � } n | j | � } | j r� | j t d | | f � | j t t j | d � � n | j d k r� | j j | � } n | } | j d k rEt j d | j � | } | t | j | | j � | j 7} n | j d t @| _ | j | � | j t | � 7_ | j d 7_ | j | j k s�| j | j k r�| j r�| j t d | j | j f � d | _ d | _ | j � n Wd | j j! � Xd S( sR Write a block of data using the current cipher, as an SSH block. i s $%xs Write packet <%s>, length %ds OUT: s >Ii s( Rekeying (hit %d packets, %d bytes sent)N(" R R R Re R8 t acquireR2 R t _build_packetR t _logR R t format_binaryR+ t updatet structt packR4 R R0 R. R) R R{ R! R" t REKEY_PACKETSt REKEY_BYTESR R% R& t _trigger_rekeyt release( R@ t datat cmdt cmd_namet orig_lent packetRr t payload( ( s3 /usr/lib/python2.7/site-packages/paramiko/packet.pyt send_messageS s@ & $ c C s� | j | j d t �} | j d k r< | j j | � } n | j rd | j t t j | d � � n t j d | d � d } | d } | t | � | j d k r� t d � � n | j | | j t | � � } | | t | � } | | t | � } | j d k r | j j | � } n | j rH| j t t j | d � � n | | } | j d k r�| | j } t j d | j | � | } t | j | | j � | j } t j | | � s�t d � � q�n t | d � } | d | | !} | j r| j t d | | f � n | j d k r5| j | � } n t | d � } | j | _ | j d t @| _ | | j d } | j | 7_ | j d 7_ | j r�| j | 7_ | j d 7_ | j | j k s�| j | j! k rTt d � � qTnc | j | j" k s| j | j# k rT| j t d | j | j f � d | _ d | _ | j$ � n t | d � } | t% k r}t% | } n d | } | j r�| j t d | t | � f � n | | f S( s� Only one thread should ever be in this function (no other locking is done). :raises SSHException: if the packet is mangled :raises NeedRekeyException: if the transport should rekey Rq s IN: s >Ii i s Invalid packet blockings >IIs Mismatched MACi s" Got payload (%d bytes, %d padding)s+ Remote transport is ignoring rekey requestss, Rekeying (hit %d packets, %d bytes received)s $%xs Read packet <%s>, length %dN(& Rv R( RQ R, R R� R R� R R R� R� t unpackRe R R* R� R5 R R1 R/ t constant_time_bytes_eqR R3 R t seqnoR R# R$ R R% R& t REKEY_PACKETS_OVERFLOW_MAXt REKEY_BYTES_OVERFLOW_MAXR� R� R� R ( R@ t headert packet_sizet leftoverR~ R� t post_packett mact mac_payloadt my_mact paddingR� t msgt raw_packet_sizeR� R� ( ( s3 /usr/lib/python2.7/site-packages/paramiko/packet.pyt read_message sn #c C sf | j d k r d St t | � t � rO x7 | D] } | j j | | � q/ Wn | j j | | � d S( N( R R t issubclassRi t listRD ( R@ t levelR� t m( ( s3 /usr/lib/python2.7/site-packages/paramiko/packet.pyR� � s c C s] | j s | j s | j r! d St j � } | | j | j k rY | j � | | _ n d S( N( R9 R+ R R: R; R< ( R@ t now( ( s3 /usr/lib/python2.7/site-packages/paramiko/packet.pyRo � s c C s t j � } x� t r� y5 | j j d � } t | � d k rH t � � n PWnl t j k r` nY t k r� } t | j � t k r� t | j � d k r� | j d t j k r� q� � n X| j r� t � � n t j � } | | | k r t j � � q q W| S( Ni� i ( R: RQ R Rg Re Rf RA R` t EnvironmentErrorRi Rj Rk Rl Rn R ( R@ R` R_ Rt Ru R� ( ( s3 /usr/lib/python2.7/site-packages/paramiko/packet.pyR| � s( * c C s� | j } d | t | � d | } t j d t | � | d | � } | | 7} | j sj | j d k r{ | t | 7} n | t j | � 7} | S( Ni i s >IBi ( R' Re R� R� R- R+ R R t ost urandom( R@ R� t bsizeR� R� ( ( s3 /usr/lib/python2.7/site-packages/paramiko/packet.pyR� � s # c C s t | _ d S( N( RQ R ( R@ ( ( s3 /usr/lib/python2.7/site-packages/paramiko/packet.pyR� s (& R R t __doc__t powR� R� R� R� RB t propertyRC RE R RL RM RO RP RR RT RU RV RW RX R[ R\ Ra Rb Rd Rv R{ R R� R� R� Ro R| R� R� ( ( ( s3 /usr/lib/python2.7/site-packages/paramiko/packet.pyR / sB . 1 * , O ( R� Rl R� RA R� R6 R: t hmacR t paramikoR t paramiko.commonR R R R R R R t paramiko.py3compatR R t paramiko.ssh_exceptionR R t paramiko.messageR R Rx R t objectR ( ( ( s3 /usr/lib/python2.7/site-packages/paramiko/packet.pyt <module> s 4
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