HEX
Server: Apache/2.4.52 (Ubuntu)
System: Linux spn-python 5.15.0-89-generic #99-Ubuntu SMP Mon Oct 30 20:42:41 UTC 2023 x86_64
User: arjun (1000)
PHP: 8.1.2-1ubuntu2.20
Disabled: NONE
$ pwd: /usr/lib/python3/dist-packages/twisted/conch/ssh/__pycache__/
Upload Files
File: //usr/lib/python3/dist-packages/twisted/conch/ssh/__pycache__/userauth.cpython-310.pyc
o

�bSl�@sdZddlZddlmZmZddlmZmZmZddl	m
Z
mZddlm
Z
ddlmZddlmZmZdd	lmZdd
lmZddlmZGdd
�d
ej�ZGdd�dej�ZdZdZdZdZdZ dZ!iZ"e#e$��%��D]\Z&Z'e&dd�dkr}e&e"e'<qme"e_(e"e_(["['dZ)dZ*dS)z�
Implementation of the ssh-userauth service.
Currently implemented authentication types are public-key and password.

Maintainer: Paul Swartz
�N)�error�
interfaces)�keys�service�	transport)�NS�getNS)�credentials)�UnauthorizedLogin)�defer�reactor)�Logger)�failure)�nativeStringc@s�eZdZdZdZdZdZdZeZ	e
jde
jdiZ
e�Zdd	�Zd
d�Zdd
�Zdd�Zdd�Zdd�Zdd�Zdd�Zdd�Zdd�Zdd�Zdd�Zd S)!�SSHUserAuthServera�
    A service implementing the server side of the 'ssh-userauth' service.  It
    is used to authenticate the user on the other side as being able to access
    this server.

    @ivar name: the name of this service: 'ssh-userauth'
    @type name: L{bytes}
    @ivar authenticatedWith: a list of authentication methods that have
        already been used.
    @type authenticatedWith: L{list}
    @ivar loginTimeout: the number of seconds we wait before disconnecting
        the user for taking too long to authenticate
    @type loginTimeout: L{int}
    @ivar attemptsBeforeDisconnect: the number of failed login attempts we
        allow before disconnecting.
    @type attemptsBeforeDisconnect: L{int}
    @ivar loginAttempts: the number of login attempts that have been made
    @type loginAttempts: L{int}
    @ivar passwordDelay: the number of seconds to delay when the user gives
        an incorrect password
    @type passwordDelay: L{int}
    @ivar interfaceToMethod: a L{dict} mapping credential interfaces to
        authentication methods.  The server checks to see which of the
        cred interfaces have checkers and tells the client that those methods
        are valid for authentication.
    @type interfaceToMethod: L{dict}
    @ivar supportedAuthentications: A list of the supported authentication
        methods.
    @type supportedAuthentications: L{list} of L{bytes}
    @ivar user: the last username the client tried to authenticate with
    @type user: L{bytes}
    @ivar method: the current authentication method
    @type method: L{bytes}
    @ivar nextService: the service the user wants started after authentication
        has been completed.
    @type nextService: L{bytes}
    @ivar portal: the L{twisted.cred.portal.Portal} we are using for
        authentication
    @type portal: L{twisted.cred.portal.Portal}
    @ivar clock: an object with a callLater method.  Stubbed out for testing.
    �ssh-userauthi�����	publickey�passwordcCs�g|_d|_d|_d|_|jjj|_g|_|j��D]}||j	vr*|j�
|j	|�q|j�d�s<d|jvr<|j�d�|j
�|j|j�|_dS)z�
        Called when the userauth service is started.  Set up instance
        variables, check if we should allow password authentication (only
        allow if the outgoing connection is encrypted) and set up a login
        timeout.
        rN�inr)�authenticatedWith�
loginAttempts�user�nextServicer�factory�portal�supportedAuthentications�listCredentialsInterfaces�interfaceToMethod�append�isEncrypted�remove�clock�	callLater�loginTimeout�timeoutAuthentication�_cancelLoginTimeout)�self�i�r*�</usr/lib/python3/dist-packages/twisted/conch/ssh/userauth.py�serviceStartedRs 
�

�z SSHUserAuthServer.serviceStartedcCs|jr
|j��d|_dSdS)zu
        Called when the userauth service is stopped.  Cancel the login timeout
        if it's still going.
        N)r'�cancel�r(r*r*r+�serviceStoppedls

�z SSHUserAuthServer.serviceStoppedcCsd|_|j�tjd�dS)z�
        Called when the user has timed out on authentication.  Disconnect
        with a DISCONNECT_NO_MORE_AUTH_METHODS_AVAILABLE message.
        Nsyou took too long)r'r�sendDisconnect�)DISCONNECT_NO_MORE_AUTH_METHODS_AVAILABLEr.r*r*r+r&us�z'SSHUserAuthServer.timeoutAuthenticationcCs�|jjd||d�||jvrt�t�d��St|�dd��}t	|d|��d�}|r<||�}|s:t�t�|�d���S|St�t�d	|����S)
a
        Try to authenticate the user with the given method.  Dispatches to a
        auth_* method.

        @param kind: the authentication method to try.
        @type kind: L{bytes}
        @param user: the username the client is authenticating with.
        @type user: L{bytes}
        @param data: authentication specific data sent by the client.
        @type data: L{bytes}
        @return: A Deferred called back if the method succeeded, or erred back
            if it failed.
        @rtype: C{defer.Deferred}
        z{user!r} trying auth {kind!r})r�kindz#unsupported authentication, failing�-�_�auth_Nz" return None instead of a Deferredzbad auth type: )
�_log�debugrr�failr�
ConchErrorr�replace�getattr)r(r2r�data�f�retr*r*r+�tryAuths
�zSSHUserAuthServer.tryAuthcCs�t|d�\}}}}||jks||jkrg|_||_||_||_|�|||�}|s5|�t�t	�
d���dS|�|j�|�
|j�|�
|j�|S)z�
        The client has requested authentication.  Payload::
            string user
            string next service
            string method
            <authentication specific data>

        @type packet: L{bytes}
        �zauth returned noneN)rrrr�methodr?�
_ebBadAuthr�Failurerr9�addCallback�_cbFinishedAuth�
addErrback�_ebMaybeBadAuth)r(�packetrrrA�rest�dr*r*r+�ssh_USERAUTH_REQUEST�s
z&SSHUserAuthServer.ssh_USERAUTH_REQUESTcCsz|\}}}||j_||j_|jj�|j|j�}|s"t�d|j����|jj	d|j
|jd�|j�t
d�|j�|��dS)z�
        The callback when user has successfully been authenticated.  For a
        description of the arguments, see L{twisted.cred.portal.Portal.login}.
        We start the service requested by the user.
        zcould not get next service: z&{user!r} authenticated with {method!r}�rrA�N)r�avatar�logoutFunctionr�
getServicerrr9r6r7rrA�
sendPacket�MSG_USERAUTH_SUCCESS�
setService)r(�result�	interfacerN�logoutrr*r*r+rE�s

�z!SSHUserAuthServer._cbFinishedAuthcCs.|�tj�|j�ttd�|j��d�dS)z�
        An intermediate errback.  If the reason is
        error.NotEnoughAuthentication, we send a MSG_USERAUTH_FAILURE, but
        with the partial success indicator set.

        @type reason: L{twisted.python.failure.Failure}
        �,��N)	�trapr�NotEnoughAuthenticationrrQ�MSG_USERAUTH_FAILUREr�joinr�r(�reasonr*r*r+rG�s�z!SSHUserAuthServer._ebMaybeBadAuthcCs�|�tj�rdS|jdkrZ|jjd|j|jd�|�t�r(|jjd|��d�n|�tj	�r9|jjd|��d�n
|jj
d	||jd
�|jd7_|j|jkrZ|j
�t
jd�dS|j
�ttd
�|j��d�dS)a{
        The final errback in the authentication chain.  If the reason is
        error.IgnoreAuthentication, we simply return; the authentication
        method has sent its own response.  Otherwise, send a failure message
        and (if the method is not 'none') increment the number of login
        attempts.

        @type reason: L{twisted.python.failure.Failure}
        N�nonez{user!r} failed auth {method!r}rLzunauthorized login: {message})�messagezreason: {reason})r^z#Error checking auth for user {user})rrrstoo many bad authsrW�)�checkr�IgnoreAuthenticationrAr6r7rr
�getErrorMessager9rr�attemptsBeforeDisconnectrr0r1rQr[rr\rr]r*r*r+rB�s6


�
����zSSHUserAuthServer._ebBadAuthcCs>t|dd��}t|dd�d�\}}}ztj�|�}Wntjy;d�|�d��}|j�	|�t
�t|��YSw|rDt|�dpEd}|r�t
|jj�ttf�t
|j�t
|j�t
d�t|f�t
|���t
|�}	t�|j|||	|�}
|j�|
dtj�St�|j||dd�}
|j�|
dtj��|j|dd��S)a
        Public key authentication.  Payload::
            byte has signature
            string algorithm name
            string key blob
            [string signature] (if has signature is True)

        Create a SSHPublicKey credential and verify it using our portal.
        rrN�z"Unsupported key type {} or bad key�asciir)�ordrr�Key�
fromString�BadKeyError�format�decoder6rrr8r
rr�	sessionID�bytes�MSG_USERAUTH_REQUESTrr�sshTyper	�
SSHPrivateKeyr�loginr�
IConchUserrF�_ebCheckKey)r(rH�hasSig�algName�blobrI�pubKeyr�	signature�b�cr*r*r+�auth_publickey�sB
�
�����
���
�z SSHUserAuthServer.auth_publickeycCs(|�tj�|j�t|�t�t���S)z�
        Called back if the user did not sent a signature.  If reason is
        error.ValidPublicKey then this key is valid for the user to
        authenticate with.  Send MSG_USERAUTH_PK_OK.
        )	rYr�ValidPublicKeyrrQ�MSG_USERAUTH_PK_OKrrCrc)r(r^rHr*r*r+ru$szSSHUserAuthServer._ebCheckKeycCs<t|dd��d}t�|j|�}|j�|dtj��|j	�S)z�
        Password authentication.  Payload::
            string password

        Make a UsernamePassword credential and verify it with our portal.
        rNr)
rr	�UsernamePasswordrrrsrrtrF�_ebPassword)r(rH�passwordr|r*r*r+�
auth_password/s
�zSSHUserAuthServer.auth_passwordcCs t��}|j�|j|j|�|S)z�
        If the password is invalid, wait before sending the failure in order
        to delay brute-force password guessing.
        )r�Deferredr#r$�
passwordDelay�callback)r(r=rJr*r*r+r�<szSSHUserAuthServer._ebPasswordN)�__name__�
__module__�__qualname__�__doc__�namer%rer�rr#r	�ISSHPrivateKey�IUsernamePasswordrr
r6r,r/r&r?rKrErGrBr}rur�r�r*r*r*r+rs.*�	

'(
rc@s�eZdZdZdZgd�Zdd�Zdd�Zdd	�Zd
d�Z	dd
�Z
dd�Zdd�Zdd�Z
dd�Zdd�Zdd�Zdd�Zdd�Zdd�Zd d!�Zd"d#�Zd$d%�Zd&d'�Zd(d)�Zd*d+�Zd,d-�Zd.d/�Zd0d1�Zd2d3�Zd4d5�Zd;d7d8�Zd9d:�Z d6S)<�SSHUserAuthClienta+
    A service implementing the client side of 'ssh-userauth'.

    This service will try all authentication methods provided by the server,
    making callbacks for more information when necessary.

    @ivar name: the name of this service: 'ssh-userauth'
    @type name: L{str}
    @ivar preferredOrder: a list of authentication methods that should be used
        first, in order of preference, if supported by the server
    @type preferredOrder: L{list}
    @ivar user: the name of the user to authenticate as
    @type user: L{bytes}
    @ivar instance: the service to start after authentication has finished
    @type instance: L{service.SSHService}
    @ivar authenticatedWith: a list of strings of authentication methods we've tried
    @type authenticatedWith: L{list} of L{bytes}
    @ivar triedPublicKeys: a list of public key objects that we've tried to
        authenticate with
    @type triedPublicKeys: L{list} of L{Key}
    @ivar lastPublicKey: the last public key object we've tried to authenticate
        with
    @type lastPublicKey: L{Key}
    r)rr�keyboard-interactivecCs||_||_dS�N)r�instance)r(rr�r*r*r+�__init__cs
zSSHUserAuthClient.__init__cCs"g|_g|_d|_|�dd�dS)Nr_rM)r�triedPublicKeys�
lastPublicKey�
askForAuthr.r*r*r+r,gsz SSHUserAuthClient.serviceStartedcCs6||_|j�tt|j�t|jj�t|�|�dS)z�
        Send a MSG_USERAUTH_REQUEST.

        @param kind: the authentication method to try.
        @type kind: L{bytes}
        @param extraData: method-specific data to go in the packet
        @type extraData: L{bytes}
        N)�lastAuthrrQrprrr�r�)r(r2�	extraDatar*r*r+r�ms
	 �zSSHUserAuthClient.askForAuthcCs>t|�dd��}|jjd|d�t|d|d�}|r|�SdS)z�
        Dispatch to an authentication method.

        @param kind: the authentication method
        @type kind: L{bytes}
        r3r4ztrying to auth with {kind})r2r5N)rr:r6r7r;)r(r2r=r*r*r+r?|s�zSSHUserAuthClient.tryAuthcGs|�dd�dS)z�
        Generic callback for a failed authentication attempt.  Respond by
        asking for the list of accepted methods (the 'none' method)
        r_rMN)r�)r(�ignored�argsr*r*r+�_ebAuth�szSSHUserAuthClient._ebAuthcCs|j�|j�dS)z�
        We received a MSG_USERAUTH_SUCCESS.  The server has accepted our
        authentication, so start the next service.
        N)rrSr�)r(rHr*r*r+�ssh_USERAUTH_SUCCESS�sz&SSHUserAuthClient.ssh_USERAUTH_SUCCESScsrt|�\}}t|�}|r�j��j��fdd�}t�fdd�|�d�D�|d�}�jjd|d���	d	t
|��S)
av
        We received a MSG_USERAUTH_FAILURE.  Payload::
            string methods
            byte partial success

        If partial success is C{True}, then the previous method succeeded but is
        not sufficient for authentication. C{methods} is a comma-separated list
        of accepted authentication methods.

        We sort the list of methods by their position in C{self.preferredOrder},
        removing methods that have already succeeded. We then call
        C{self.tryAuth} with the most preferred method.

        @param packet: the C{MSG_USERAUTH_FAILURE} payload.
        @type packet: L{bytes}

        @return: a L{defer.Deferred} that will be callbacked with L{None} as
            soon as all authentication methods have been tried, or L{None} if no
            more authentication methods are available.
        @rtype: C{defer.Deferred} or L{None}
        cs |�jvr�j�|�St�j�S)a8
            Invoked once per authentication method in order to extract a
            comparison key which is then used for sorting.

            @param meth: the authentication method.
            @type meth: L{bytes}

            @return: the comparison key for C{meth}.
            @rtype: L{int}
            )�preferredOrder�index�len)�methr.r*r+�orderByPreference�s

zASSHUserAuthClient.ssh_USERAUTH_FAILURE.<locals>.orderByPreferencec3s�|]
}|�jvr|VqdSr�)r)�.0r�r.r*r+�	<genexpr>�s�
��z9SSHUserAuthClient.ssh_USERAUTH_FAILURE.<locals>.<genexpr>rW)�keyzcan continue with: {methods})�methodsN)rrhrr r��sorted�splitr6r7�_cbUserauthFailure�iter)r(rH�canContinue�partialr�r*r.r+�ssh_USERAUTH_FAILURE�s
��	z&SSHUserAuthClient.ssh_USERAUTH_FAILUREcCsZ|rdSzt|�}Wnty|j�tjd�YdSwt�|j|�}|�|j	|�|S)Ns(no more authentication methods available)
�next�
StopIterationrr0r1r�
maybeDeferredr?rDr�)r(rT�iteratorrArJr*r*r+r��s
��z$SSHUserAuthClient._cbUserauthFailurecCs>t|dt|j�dd��d�}|dur||�S|�dd�dS)z�
        This message (number 60) can mean several different messages depending
        on the current authentication type.  We dispatch to individual methods
        in order to handle this request.
        zssh_USERAUTH_PK_OK_%sr3r4Nr_rM)r;rr�r:r�)r(rH�funcr*r*r+�ssh_USERAUTH_PK_OK�s�z$SSHUserAuthClient.ssh_USERAUTH_PK_OKcCs�|j}t|jj�ttf�t|j�t|jj�td�dt|�	��t|�
��}|�||�}|s;|�dd�dS|�
|j�|�|j�dS)z�
        This is MSG_USERAUTH_PK.  Our public key is valid, so we create a
        signature and try to authenticate with it.
        r�r_rMN)r�rrrnrorprr�r�rqrx�signDatar�rD�
_cbSignedDatarFr�)r(rH�	publicKeyr{rJr*r*r+�ssh_USERAUTH_PK_OK_publickey�s.
��
���
�
��
z.SSHUserAuthClient.ssh_USERAUTH_PK_OK_publickeycs^t|d�\�}}d�_�_��d�}|��j�j�}|���fdd��|��j�j�dS)z�
        This is MSG_USERAUTH_PASSWD_CHANGEREQ.  The password given has expired.
        We ask for an old password and a new password, then send both back to
        the server.
        rfNsOld Password: cs
����Sr�)�getPassword)r���promptr(r*r+�<lambda>s
z?SSHUserAuthClient.ssh_USERAUTH_PK_OK_password.<locals>.<lambda>)	r�_oldPass�_newPassr��addCallbacks�_setOldPassr�rD�_setNewPass)r(rH�languagerIrJr*r�r+�ssh_USERAUTH_PK_OK_passwords
z-SSHUserAuthClient.ssh_USERAUTH_PK_OK_passwordcCs�t|d�\}}}}t�d|dd��d}|dd�}g}t|�D]}t|�\}	}tt|dd���}
|dd�}|�|	|
f�q!|�|||�}|�|j	�|�
|j�dS)z�
        This is MSG_USERAUTH_INFO_RESPONSE.  The server has sent us the
        questions it wants us to answer, so we ask the user and sent the
        responses.
        r@�!LN�rr)r�struct�unpack�range�boolrhr �getGenericAnswersrD�_cbGenericAnswersrFr�)r(rHr��instruction�langr<�
numPrompts�promptsr)r��echorJr*r*r+�'ssh_USERAUTH_PK_OK_keyboard_interactivesz9SSHUserAuthClient.ssh_USERAUTH_PK_OK_keyboard_interactivecCs6|j}|�ddt|���t|���t|��dS)z�
        Called back out of self.signData with the signed data.  Send the
        authentication request with the signature.

        @param signedData: the data signed by the user's private key.
        @type signedData: L{bytes}
        rr�N)r�r�rrqrx)r(�
signedDatar�r*r*r+r�&s
"�zSSHUserAuthClient._cbSignedDatacCs
||_dS)z�
        Called back when we are choosing a new password.  Simply store the old
        password for now.

        @param op: the old password as entered by the user
        @type op: L{bytes}
        N)r�)r(�opr*r*r+r�4s
zSSHUserAuthClient._setOldPasscCs,|j}d|_|�ddt|�t|��dS)z�
        Called back when we are choosing a new password.  Get the old password
        and send the authentication message with both.

        @param np: the new password as entered by the user
        @type np: L{bytes}
        NrrX)r�r�r)r(�npr�r*r*r+r�>s zSSHUserAuthClient._setNewPasscCs>t�dt|��}|D]}|t|�d��7}q
|j�t|�dS)a
        Called back when we are finished answering keyboard-interactive
        questions.  Send the info back to the server in a
        MSG_USERAUTH_INFO_RESPONSE.

        @param responses: a list of L{bytes} responses
        @type responses: L{list}
        r��UTF8N)r��packr�r�encoderrQ�MSG_USERAUTH_INFO_RESPONSE)r(�	responsesr<�rr*r*r+r�Js	z#SSHUserAuthClient._cbGenericAnswerscCst�|j�}|�|j�|S)z�
        Try to authenticate with a public key.  Ask the user for a public key;
        if the user has one, send the request to the server and return True.
        Otherwise, return False.

        @rtype: L{bool}
        )rr��getPublicKey�addBoth�_cbGetPublicKey�r(rJr*r*r+r}Xsz SSHUserAuthClient.auth_publickeycCsjt|tj�sd}|dur3||_|j�|�|jjd|��d�|�	ddt
|���t
|����dSdS)Nzusing key of type {keyType})�keyTyperraTF)
�
isinstancerrir�r�r r6r7�typer�rrqrx)r(r�r*r*r+r�ds�z!SSHUserAuthClient._cbGetPublicKeycCs$|��}|r|�|j|j�dSdS)z�
        Try to authenticate with a password.  Ask the user for a password.
        If the user will return a password, return True.  Otherwise, return
        False.

        @rtype: L{bool}
        TF)r�r��_cbPasswordr�r�r*r*r+r�rs
zSSHUserAuthClient.auth_passwordcCs(|j�d�|�dtd�td��dS)z�
        Try to authenticate with keyboard-interactive authentication.  Send
        the request to the server and return True.

        @rtype: L{bool}
        z!authing with keyboard-interactiver�rMT)r6r7r�rr.r*r*r+�auth_keyboard_interactive�sz+SSHUserAuthClient.auth_keyboard_interactivecCs|�ddt|��dS)z�
        Called back when the user gives a password.  Send the request to the
        server.

        @param password: the password the user entered
        @type password: L{bytes}
        rraN)r�r)r(r�r*r*r+r��szSSHUserAuthClient._cbPasswordcCs|��}|sdS|�|j|�S)am
        Sign the given data with the given public key.

        By default, this will call getPrivateKey to get the private key,
        then sign the data using Key.sign().

        This method is factored out so that it can be overridden to use
        alternate methods, such as a key agent.

        @param publicKey: The public key object returned from L{getPublicKey}
        @type publicKey: L{keys.Key}

        @param signData: the data to be signed by the private key.
        @type signData: L{bytes}
        @return: a Deferred that's called back with the signature
        @rtype: L{defer.Deferred}
        N)�
getPrivateKeyrD�_cbSignData)r(r�r�r�r*r*r+r��szSSHUserAuthClient.signDatacCs
|�|�S)ae
        Called back when the private key is returned.  Sign the data and
        return the signature.

        @param privateKey: the private key object
        @type privateKey: L{keys.Key}
        @param signData: the data to be signed by the private key.
        @type signData: L{bytes}
        @return: the signature
        @rtype: L{bytes}
        )�sign)r(�
privateKeyr�r*r*r+r��s
zSSHUserAuthClient._cbSignDatacCsdS)a
        Return a public key for the user.  If no more public keys are
        available, return L{None}.

        This implementation always returns L{None}.  Override it in a
        subclass to actually find and return a public key object.

        @rtype: L{Key} or L{None}
        Nr*r.r*r*r+r��s
zSSHUserAuthClient.getPublicKeycC�t�t��S)a
        Return a L{Deferred} that will be called back with the private key
        object corresponding to the last public key from getPublicKey().
        If the private key is not available, errback on the Deferred.

        @rtype: L{Deferred} called back with L{Key}
        �rr8�NotImplementedErrorr.r*r*r+r��szSSHUserAuthClient.getPrivateKeyNcCr�)a
        Return a L{Deferred} that will be called back with a password.
        prompt is a string to display for the password, or None for a generic
        'user@hostname's password: '.

        @type prompt: L{bytes}/L{None}
        @rtype: L{defer.Deferred}
        r�)r(r�r*r*r+r��s	zSSHUserAuthClient.getPasswordcCr�)a�
        Returns a L{Deferred} with the responses to the promopts.

        @param name: The name of the authentication currently in progress.
        @param instruction: Describes what the authentication wants.
        @param prompts: A list of (prompt, echo) pairs, where prompt is a
        string to display and echo is a boolean indicating whether the
        user's response should be echoed as they type it.
        r�)r(r�r�r�r*r*r+r��s
z#SSHUserAuthClient.getGenericAnswersr�)!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�Fs>
8




r��2�3�4�5�=�<r��MSG_)+r�r��
twisted.conchrr�twisted.conch.sshrrr�twisted.conch.ssh.commonrr�twisted.credr	�twisted.cred.errorr
�twisted.internetrr�twisted.loggerr
�twisted.pythonr�twisted.python.compatr�
SSHServicerr�rpr[rR�MSG_USERAUTH_BANNERr�r�messages�list�locals�items�k�v�protocolMessages�MSG_USERAUTH_PASSWD_CHANGEREQ�MSG_USERAUTH_INFO_REQUESTr*r*r*r+�<module>sF.&�
@ Telegram