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o �b� � @ s^ d Z ddlZddlmZ ddlmZmZmZmZ ddl m Z ddl m Z G dd� de j �ZdS ) z� A Factory for SSH servers. See also L{twisted.conch.openssh_compat.factory} for OpenSSH compatibility. Maintainer: Paul Swartz � N)�error)�_kex� connection� transport�userauth)�protocol)�Loggerc @ sb e Zd ZdZe� ZejZe j e j d�Z dd� Zdd� Zdd� Zd d � Zd d � Zd d� Zdd� ZdS )� SSHFactoryz$ A Factory for SSH servers. )� ssh-userauths ssh-connectionc C sZ t | d�s | �� | _t | d�s| �� | _| jr| js t�d��t | d�s+| �� | _dS dS )z4 Check for public and private keys. � publicKeys� privateKeyszno host keys, failing�primesN) �hasattr� getPublicKeysr �getPrivateKeysr r � ConchError� getPrimesr ��self� r �;/usr/lib/python3/dist-packages/twisted/conch/ssh/factory.py� startFactory" s �zSSHFactory.startFactoryc C sB t j�| |�}| j�� |_| js | j�d� dd� |j D �|_ |S )a= Create an instance of the server side of the SSH protocol. @type addr: L{twisted.internet.interfaces.IAddress} provider @param addr: The address at which the server will listen. @rtype: L{twisted.conch.ssh.transport.SSHServerTransport} @return: The built transport. zTdisabling non-fixed-group key exchange algorithms because we cannot find moduli filec S s$ g | ]}t �|�st �|�r|�qS r )r � isFixedGroup�isEllipticCurve)�.0� kexAlgorithmr r r � <listcomp>@ s ���z,SSHFactory.buildProtocol.<locals>.<listcomp>) r �Factory� buildProtocolr �keys�supportedPublicKeysr �_log�info�supportedKeyExchanges)r �addr�tr r r r / s ��zSSHFactory.buildProtocolc C � t d��)z� Called when the factory is started to get the public portions of the servers host keys. Returns a dictionary mapping SSH key types to public key strings. @rtype: L{dict} zgetPublicKeys unimplemented��NotImplementedErrorr r r r r G � zSSHFactory.getPublicKeysc C r& )z� Called when the factory is started to get the private portions of the servers host keys. Returns a dictionary mapping SSH key types to L{twisted.conch.ssh.keys.Key} objects. @rtype: L{dict} z getPrivateKeys unimplementedr' r r r r r Q r) zSSHFactory.getPrivateKeysc C s dS )z� Called when the factory is started to get Diffie-Hellman generators and primes to use. Returns a dictionary mapping number of bits to lists of tuple of (generator, prime). @rtype: L{dict} Nr r r r r r [ s zSSHFactory.getPrimesc s2 t | j�� � fdd�d�}|d }t�| j| �S )z� Return a tuple of (g, p) for a Diffe-Hellman process, with p being as close to bits bits as possible. @type bits: L{int} @rtype: L{tuple} c s t | � �S )N)�abs)�i��bitsr r �<lambda>l s z'SSHFactory.getDHPrime.<locals>.<lambda>)�keyr )�sortedr r �random�choice)r r- � primesKeys�realBitsr r, r � getDHPrimed s zSSHFactory.getDHPrimec C s |dks t |d�r| j| S dS )z� Return a class to use as a service for the given transport. @type transport: L{transport.SSHServerTransport} @type service: L{bytes} @rtype: subclass of L{service.SSHService} r �avatarN)r �services)r r �servicer r r � getServicep s �zSSHFactory.getServiceN)�__name__� __module__� __qualname__�__doc__r r! r �SSHServerTransportr r �SSHUserAuthServerr � SSHConnectionr7 r r r r r r5 r9 r r r r r s � r )r= r1 � twisted.conchr �twisted.conch.sshr r r r �twisted.internetr �twisted.loggerr r r r r r r �<module> s
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