U
    R+|jM  ã                   @   sŠ  d Z ddlZddlZddlmZ ddlmZ ddlmZ ddl	m
Z
mZ ddlmZmZ ddlmZ dd	lmZ dd
lmZmZ ddlmZ ddlmZ ddlmZ ddlmZ ddlmZ e  d¡Z!edƒZ"dZ#dZ$dZ%dZ&dZ'dZ(dZ)dZ*dZ+dZ,de, Z-ej.ej/ Z0dZ1dd„ Z2d d!„ Z3d"d#„ Z4d$d%„ Z5d&d'„ Z6d(d)„ Z7d*d+„ Z8G d,d-„ d-e9ƒZ:d.d/„ Z;d0d1„ Z<G d2d3„ d3e9ƒZ=G d4d5„ d5eƒZ>dS )6z’
Cross Site Request Forgery Middleware.

This module provides a middleware that implements protection
against request forgeries from other sites.
é    N)Údefaultdict©Úurlparse)Úsettings)ÚDisallowedHostÚImproperlyConfigured)ÚHttpHeadersÚUnreadablePostError)Úget_callable)Úpatch_vary_headers)Úconstant_time_compareÚget_random_string)ÚMiddlewareMixin)Úcached_property©Úis_same_domain)Úlog_response)Ú_lazy_re_compilezdjango.security.csrfz[^a-zA-Z0-9]z?Origin checking failed - %s does not match any trusted origins.z%Referer checking failed - no Referer.z@Referer checking failed - %s does not match any trusted origins.zCSRF cookie not set.zCSRF token missing.z/Referer checking failed - Referer is malformed.zCReferer checking failed - Referer is insecure while host is secure.zhas incorrect lengthzhas invalid charactersé    é   Z
_csrftokenc                   C   s
   t tjƒS )z/Return the view to be used for CSRF rejections.)r
   r   ZCSRF_FAILURE_VIEW© r   r   ú^c:\users\snmko\desktop\web_content\django_cbt\venv\Lib\site-packages\django/middleware/csrf.pyÚ_get_failure_view1   s    r   c                   C   s   t ttd�S )N)Úallowed_chars)r   ÚCSRF_SECRET_LENGTHÚCSRF_ALLOWED_CHARSr   r   r   r   Ú_get_new_csrf_string6   s    r   c                    sP   t ƒ }t‰ t‡ fdd„| D ƒ‡ fdd„|D ƒƒ}d ‡ fdd„|D ƒ¡}|| S )z�
    Given a secret (assumed to be a string of CSRF_ALLOWED_CHARS), generate a
    token by adding a mask and applying it to the secret.
    c                 3   s   | ]}ˆ   |¡V  qd S ©N©Úindex©Ú.0Úx©Úcharsr   r   Ú	<genexpr>A   s     z&_mask_cipher_secret.<locals>.<genexpr>Ú c                 3   s&   | ]\}}ˆ || t ˆ ƒ  V  qd S r   )Úlen©r!   r"   Úyr#   r   r   r%   B   s     )r   r   ÚzipÚjoin)ÚsecretÚmaskÚpairsÚcipherr   r#   r   Ú_mask_cipher_secret:   s
    &r0   c                    sZ   | dt … }| t d… } t‰ t‡ fdd„| D ƒ‡ fdd„|D ƒƒ}d ‡ fdd„|D ƒ¡S )zÑ
    Given a token (assumed to be a string of CSRF_ALLOWED_CHARS, of length
    CSRF_TOKEN_LENGTH, and that its first half is a mask), use it to decrypt
    the second half to produce the original secret.
    Nc                 3   s   | ]}ˆ   |¡V  qd S r   r   r    r#   r   r   r%   O   s     z'_unmask_cipher_token.<locals>.<genexpr>r&   c                 3   s   | ]\}}ˆ ||  V  qd S r   r   r(   r#   r   r   r%   P   s     )r   r   r*   r+   )Útokenr-   r.   r   r#   r   Ú_unmask_cipher_tokenF   s
    &r2   c                 C   s*   t ƒ }| j tjrt|ƒn|ddœ¡ |S )zDGenerate a new random CSRF_COOKIE value, and add it to request.META.T)ÚCSRF_COOKIEÚCSRF_COOKIE_NEEDS_UPDATE)r   ÚMETAÚupdater   ZCSRF_COOKIE_MASKEDr0   ©ÚrequestÚcsrf_secretr   r   r   Ú_add_new_csrf_cookieS   s    ÿ
øÿr:   c                 C   s0   d| j kr | j d }d| j d< nt| ƒ}t|ƒS )aº  
    Return the CSRF token required for a POST form. The token is an
    alphanumeric value. A new token is created if one is not already set.

    A side effect of calling this function is to make the csrf_protect
    decorator and the CsrfViewMiddleware add a CSRF cookie and a 'Vary: Cookie'
    header to the outgoing response.  For this reason, you may need to use this
    function lazily, as is done by the csrf context processor.
    r3   Tr4   )r5   r:   r0   r7   r   r   r   Ú	get_tokene   s
    


r;   c                 C   s   t | ƒ dS )zi
    Change the CSRF token in use for a request - should be done on login
    for security purposes.
    N)r:   )r8   r   r   r   Úrotate_tokenz   s    r<   c                   @   s   e Zd Zdd„ ZdS )ÚInvalidTokenFormatc                 C   s
   || _ d S r   ©Úreason©Úselfr?   r   r   r   Ú__init__ƒ   s    zInvalidTokenFormat.__init__N©Ú__name__Ú
__module__Ú__qualname__rB   r   r   r   r   r=   ‚   s   r=   c                 C   s.   t | ƒttfkrttƒ‚t | ¡r*ttƒ‚dS )zá
    Raise an InvalidTokenFormat error if the token has an invalid length or
    characters that aren't allowed. The token argument can be a CSRF cookie
    secret or non-cookie CSRF token, and either masked or unmasked.
    N)r'   ÚCSRF_TOKEN_LENGTHr   r=   ÚREASON_INCORRECT_LENGTHÚinvalid_token_chars_reÚsearchÚREASON_INVALID_CHARACTERS)r1   r   r   r   Ú_check_token_format‡   s    
rL   c                 C   s.   t | ƒtkrt| ƒ} t | ƒtks$t‚t| |ƒS )aƒ  
    Return whether the given CSRF token matches the given CSRF secret, after
    unmasking the token if necessary.

    This function assumes that the request_csrf_token argument has been
    validated to have the correct length (CSRF_SECRET_LENGTH or
    CSRF_TOKEN_LENGTH characters) and allowed characters, and that if it has
    length CSRF_TOKEN_LENGTH, it is a masked secret.
    )r'   rG   r2   r   ÚAssertionErrorr   )Úrequest_csrf_tokenr9   r   r   r   Ú_does_token_match”   s    rO   c                   @   s   e Zd Zdd„ ZdS )ÚRejectRequestc                 C   s
   || _ d S r   r>   r@   r   r   r   rB   ¦   s    zRejectRequest.__init__NrC   r   r   r   r   rP   ¥   s   rP   c                   @   sŒ   e Zd ZdZedd„ ƒZedd„ ƒZedd„ ƒZdd	„ Zd
d„ Z	dd„ Z
dd„ Zdd„ Zdd„ Zdd„ Zdd„ Zdd„ Zdd„ Zdd„ ZdS )ÚCsrfViewMiddlewarezê
    Require a present and correct csrfmiddlewaretoken for POST requests that
    have a CSRF cookie, and set an outgoing CSRF cookie.

    This middleware should be used in conjunction with the {% csrf_token %}
    template tag.
    c                 C   s   dd„ t jD ƒS )Nc                 S   s   g | ]}t |ƒj d ¡‘qS ©Ú*)r   ÚnetlocÚlstrip©r!   Úoriginr   r   r   Ú
<listcomp>µ   s   ÿzACsrfViewMiddleware.csrf_trusted_origins_hosts.<locals>.<listcomp>©r   ÚCSRF_TRUSTED_ORIGINS©rA   r   r   r   Úcsrf_trusted_origins_hosts³   s    þz-CsrfViewMiddleware.csrf_trusted_origins_hostsc                 C   s   dd„ t jD ƒS )Nc                 S   s   h | ]}d |kr|’qS rR   r   rV   r   r   r   Ú	<setcomp>¼   s      z;CsrfViewMiddleware.allowed_origins_exact.<locals>.<setcomp>rY   r[   r   r   r   Úallowed_origins_exactº   s    z(CsrfViewMiddleware.allowed_origins_exactc                 C   s:   t tƒ}dd„ tjD ƒD ]}||j  |j d¡¡ q|S )z‚
        A mapping of allowed schemes to list of allowed netlocs, where all
        subdomains of the netloc are allowed.
        c                 s   s   | ]}d |krt |ƒV  qdS )rS   Nr   rV   r   r   r   r%   Å   s   þz?CsrfViewMiddleware.allowed_origin_subdomains.<locals>.<genexpr>rS   )r   Úlistr   rZ   ÚschemeÚappendrT   rU   )rA   Úallowed_origin_subdomainsÚparsedr   r   r   rb   ¾   s    þ
z,CsrfViewMiddleware.allowed_origin_subdomainsc                 C   s
   d|_ d S )NT)Úcsrf_processing_done)rA   r8   r   r   r   Ú_acceptÏ   s    zCsrfViewMiddleware._acceptc                 C   s(   t ƒ ||d�}td||j||td� |S )Nr>   zForbidden (%s): %s)Úresponser8   Úlogger)r   r   Úpathrg   )rA   r8   r?   rf   r   r   r   Ú_rejectÖ   s    úzCsrfViewMiddleware._rejectc                 C   sŒ   t jr6z|j t¡}W qh tk
r2   tdƒ‚Y qhX n2z|jt j }W n t	k
r^   d}Y n
X t
|ƒ |dkrtdS t|ƒtkrˆt|ƒ}|S )a  
        Return the CSRF secret originally associated with the request, or None
        if it didn't have one.

        If the CSRF_USE_SESSIONS setting is false, raises InvalidTokenFormat if
        the request's secret has invalid characters or an invalid length.
        z„CSRF_USE_SESSIONS is enabled, but request.session is not set. SessionMiddleware must appear before CsrfViewMiddleware in MIDDLEWARE.N)r   ÚCSRF_USE_SESSIONSÚsessionÚgetÚCSRF_SESSION_KEYÚAttributeErrorr   ZCOOKIESÚCSRF_COOKIE_NAMEÚKeyErrorrL   r'   rG   r2   ©rA   r8   r9   r   r   r   Ú_get_secretâ   s"    ÿ
zCsrfViewMiddleware._get_secretc              
   C   sj   t jr.|j t¡|jd krf|jd |jt< n8|jt j|jd t jt j	t j
t jt jt jd� t|dƒ d S )Nr3   )Zmax_ageÚdomainrh   ÚsecureÚhttponlyÚsamesite)ÚCookie)r   rj   rk   rl   rm   r5   Ú
set_cookiero   ZCSRF_COOKIE_AGEÚCSRF_COOKIE_DOMAINZCSRF_COOKIE_PATHZCSRF_COOKIE_SECUREZCSRF_COOKIE_HTTPONLYZCSRF_COOKIE_SAMESITEr   ©rA   r8   rf   r   r   r   Ú_set_csrf_cookie  s    øz#CsrfViewMiddleware._set_csrf_cookiec                    s®   |j d }z| ¡ }W n tk
r*   Y n&X d| ¡ r:dnd|f }||krPdS || jkr^dS zt|ƒ}W n tk
r€   Y dS X |j}|j‰ t	‡ fdd„| j
 |d	¡D ƒƒS )
NÚHTTP_ORIGINz%s://%sÚhttpsÚhttpTFc                 3   s   | ]}t ˆ |ƒV  qd S r   r   ©r!   Úhost©Zrequest_netlocr   r   r%   )  s   ÿz6CsrfViewMiddleware._origin_verified.<locals>.<genexpr>r   )r5   Úget_hostr   Ú	is_securer^   r   Ú
ValueErrorr`   rT   Úanyrb   rl   )rA   r8   Zrequest_originZ	good_hostZgood_originZparsed_originZrequest_schemer   r�   r   Ú_origin_verified  s,    
þ
þz#CsrfViewMiddleware._origin_verifiedc                    s  |j  d¡‰ ˆ d krttƒ‚ztˆ ƒ‰ W n tk
rD   ttƒ‚Y nX dˆ jˆ jfkr^ttƒ‚ˆ jdkrptt	ƒ‚t
‡ fdd„| jD ƒƒrŒd S tjr˜tjntj}|d krÚz| ¡ }W qö tk
rÖ   ttˆ  ¡  ƒ‚Y qöX n| ¡ }|dkröd||f }tˆ j|ƒ�sttˆ  ¡  ƒ‚d S )NZHTTP_REFERERr&   r}   c                 3   s   | ]}t ˆ j|ƒV  qd S r   )r   rT   r   ©Zrefererr   r   r%   @  s   ÿz4CsrfViewMiddleware._check_referer.<locals>.<genexpr>)Ú443Ú80z%s:%s)r5   rl   rP   ÚREASON_NO_REFERERr   r„   ÚREASON_MALFORMED_REFERERr`   rT   ÚREASON_INSECURE_REFERERr…   r\   r   rj   ZSESSION_COOKIE_DOMAINry   r‚   r   ÚREASON_BAD_REFERERÚgeturlZget_portr   )rA   r8   Zgood_refererZserver_portr   r‡   r   Ú_check_referer.  s:    
þÿýz!CsrfViewMiddleware._check_refererc                 C   s0   |dkrt  |¡}d|›d�}d|› d|› d�S )NÚPOSTzthe z HTTP headerzCSRF token from ú Ú.)r   Zparse_header_name)rA   r?   Útoken_sourceÚheader_namer   r   r   Ú_bad_token_message[  s    
z%CsrfViewMiddleware._bad_token_messagec              
   C   s8  z|   |¡}W n4 tk
rB } ztd|j› d�ƒ‚W 5 d }~X Y nX |d krTttƒ‚d}|jdkrŠz|j dd¡}W n tk
rˆ   Y nX |dkrÈz|j	t
j }W n tk
r¾   ttƒ‚Y nX t
j}nd}zt|ƒ W n: tk
�r } z|  |j|¡}t|ƒ‚W 5 d }~X Y nX t||ƒ�s4|  d|¡}t|ƒ‚d S )NzCSRF cookie r’   r&   r�   ZcsrfmiddlewaretokenZ	incorrect)rr   r=   rP   r?   ÚREASON_NO_CSRF_COOKIEÚmethodr�   rl   r	   r5   r   ZCSRF_HEADER_NAMErp   ÚREASON_CSRF_TOKEN_MISSINGrL   r•   rO   )rA   r8   r9   ÚexcrN   r“   r?   r   r   r   Ú_check_tokenb  s6    $
zCsrfViewMiddleware._check_tokenc                 C   sB   z|   |¡}W n tk
r*   t|ƒ Y nX |d k	r>||jd< d S )Nr3   )rr   r=   r:   r5   rq   r   r   r   Úprocess_request–  s    z"CsrfViewMiddleware.process_requestc              
   C   s  t |ddƒrd S t |ddƒr d S |jdkr4|  |¡S t |ddƒrJ|  |¡S d|jkrv|  |¡sÂ|  |t|jd  ¡S nL| ¡ rÂz|  |¡ W n4 t	k
rÀ } z|  ||j
¡ W Y ¢S d }~X Y nX z|  |¡ W n6 t	k
�r } z|  ||j
¡ W Y ¢S d }~X Y nX |  |¡S )Nrd   FZcsrf_exempt)ÚGETÚHEADÚOPTIONSÚTRACEZ_dont_enforce_csrf_checksr|   )Úgetattrr—   re   r5   r†   ri   ÚREASON_BAD_ORIGINrƒ   r�   rP   r?   rš   )rA   r8   ÚcallbackÚcallback_argsÚcallback_kwargsr™   r   r   r   Úprocess_view£  s0    




 ÿ$$zCsrfViewMiddleware.process_viewc                 C   s&   |j  d¡r"|  ||¡ d|j d< |S )Nr4   F)r5   rl   r{   rz   r   r   r   Úprocess_responseÜ  s    
z#CsrfViewMiddleware.process_responseN)rD   rE   rF   Ú__doc__r   r\   r^   rb   re   ri   rr   r{   r†   r�   r•   rš   r›   r¥   r¦   r   r   r   r   rQ   ª   s$   


 -49rQ   )?r§   ÚloggingÚstringÚcollectionsr   Úurllib.parser   Zdjango.confr   Zdjango.core.exceptionsr   r   Zdjango.httpr   r	   Zdjango.urlsr
   Zdjango.utils.cacher   Zdjango.utils.cryptor   r   Zdjango.utils.deprecationr   Zdjango.utils.functionalr   Zdjango.utils.httpr   Zdjango.utils.logr   Zdjango.utils.regex_helperr   Ú	getLoggerrg   rI   r¡   rŠ   r�   r–   r˜   r‹   rŒ   rH   rK   r   rG   Úascii_lettersÚdigitsr   rm   r   r   r0   r2   r:   r;   r<   Ú	Exceptionr=   rL   rO   rP   rQ   r   r   r   r   Ú<module>   sV   
ÿ