a
    ÛEbVH  ã                   @   s’  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 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 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$dZ%dZ&dZ'dZ(dZ)dZ*dZ+dZ,dZ-de- Z.ej/ej0 Z1dZ2dd „ Z3d!d"„ Z4d#d$„ Z5d%d&„ Z6d'd(„ Z7d)d*„ Z8d+d,„ Z9G d-d.„ d.e:ƒZ;d/d0„ Z<d1d2„ Z=G d3d4„ d4e:ƒZ>G d5d6„ d6eƒZ?dS )7z’
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UnreadablePostError)ÚHttpHeaders)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   úV/home/ja/django-apps/lartica_env/lib/python3.9/site-packages/django/middleware/csrf.pyÚ_get_failure_view2   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_string7   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>B   ó    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%   C   r&   )r   r   ÚzipÚjoin)ÚsecretÚmaskÚpairsÚcipherr   r#   r   Ú_mask_cipher_secret;   s
    &r1   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%   P   r&   z'_unmask_cipher_token.<locals>.<genexpr>r'   c                 3   s   | ]\}}ˆ ||  V  qd S r   r   r)   r#   r   r   r%   Q   r&   )r   r   r+   r,   )Útokenr.   r/   r   r#   r   Ú_unmask_cipher_tokenG   s
    &r3   c                 C   s    t ƒ }| j t|ƒ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updater1   ©ÚrequestZcsrf_secretr   r   r   Ú_add_new_csrf_cookieT   s    þÿr:   c                 C   s4   d| j v r$t| j d ƒ}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.
    r4   Tr5   )r6   r3   r:   r1   r8   r   r   r   Ú	get_token`   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:   )r9   r   r   r   Úrotate_tokenu   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__~   s    zInvalidTokenFormat.__init__N©Ú__name__Ú
__module__Ú__qualname__rB   r   r   r   r   r=   }   s   r=   c                 C   sB   t | ƒttfvrttƒ‚t | ¡r*ttƒ‚t | ƒtkr>t| ƒS | S r   )	r(   ÚCSRF_TOKEN_LENGTHr   r=   ÚREASON_INCORRECT_LENGTHÚinvalid_token_chars_reÚsearchÚREASON_INVALID_CHARACTERSr1   )r2   r   r   r   Ú_sanitize_token‚   s    
rL   c                 C   s   t t| ƒt|ƒƒS r   )r   r3   )Úrequest_csrf_tokenÚ
csrf_tokenr   r   r   Ú_does_token_match“   s    þrO   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   œ   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>¬   s   ÿzACsrfViewMiddleware.csrf_trusted_origins_hosts.<locals>.<listcomp>©r   ÚCSRF_TRUSTED_ORIGINS©rA   r   r   r   Úcsrf_trusted_origins_hostsª   s    þz-CsrfViewMiddleware.csrf_trusted_origins_hostsc                 C   s   dd„ t jD ƒS )Nc                 S   s   h | ]}d |vr|’qS rR   r   rV   r   r   r   Ú	<setcomp>³   r&   z;CsrfViewMiddleware.allowed_origins_exact.<locals>.<setcomp>rY   r[   r   r   r   Úallowed_origins_exact±   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 |v rt |ƒV  qdS )rS   Nr   rV   r   r   r   r%   ¼   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   µ   s    þ
z,CsrfViewMiddleware.allowed_origin_subdomainsc                 C   s
   d|_ d S )NT)Úcsrf_processing_done)rA   r9   r   r   r   Ú_acceptÆ   s    zCsrfViewMiddleware._acceptc                 C   s(   t ƒ ||d�}td||j||td� |S )Nr>   zForbidden (%s): %s)Úresponser9   Úlogger)r   r   Úpathrg   )rA   r9   r?   rf   r   r   r   Ú_rejectÍ   s    úzCsrfViewMiddleware._rejectc                 C   sz   t jr2z|j t¡W S  ty.   tdƒ‚Y qv0 nDz|jt j }W n t	yV   Y d S 0 t
|ƒ}||krrd|jd< |S d S )Nz„CSRF_USE_SESSIONS is enabled, but request.session is not set. SessionMiddleware must appear before CsrfViewMiddleware in MIDDLEWARE.Tr5   )r   ÚCSRF_USE_SESSIONSÚsessionÚgetÚCSRF_SESSION_KEYÚAttributeErrorr   ZCOOKIESÚCSRF_COOKIE_NAMEÚKeyErrorrL   r6   )rA   r9   Zcookie_tokenrN   r   r   r   Ú
_get_tokenÙ   s    ÿ
zCsrfViewMiddleware._get_tokenc              
   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 )Nr4   )Zmax_ageÚdomainrh   ÚsecureÚhttponlyÚsamesite)ÚCookie)r   rj   rk   rl   rm   r6   Ú
set_cookiero   ZCSRF_COOKIE_AGEÚCSRF_COOKIE_DOMAINZCSRF_COOKIE_PATHZCSRF_COOKIE_SECUREZCSRF_COOKIE_HTTPONLYZCSRF_COOKIE_SAMESITEr   ©rA   r9   rf   r   r   r   Ú_set_csrf_cookieò   s    øz#CsrfViewMiddleware._set_csrf_cookiec                    sª   |j d }z| ¡ }W n ty(   Y n&0 d| ¡ r8dnd|f }||krNdS || jv r\dS zt|ƒ}W n ty|   Y dS 0 |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   )r6   Úget_hostr   Ú	is_securer^   r   Ú
ValueErrorr`   rT   Úanyrb   rl   )rA   r9   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 u rttƒ‚ztˆ ƒ‰ W n tyB   ttƒ‚Y n0 dˆ jˆ jfv r\ttƒ‚ˆ jdkrntt	ƒ‚t
‡ fdd„| jD ƒƒrŠd S tjr–tjntj}|d u rÖz| ¡ }W qò tyÒ   ttˆ  ¡  ƒ‚Y qò0 n| ¡ }|dvròd||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%   0  s   ÿz4CsrfViewMiddleware._check_referer.<locals>.<genexpr>)Ú443Ú80z%s:%s)r6   rl   rP   ÚREASON_NO_REFERERr   rƒ   ÚREASON_MALFORMED_REFERERr`   rT   ÚREASON_INSECURE_REFERERr„   r\   r   rj   ZSESSION_COOKIE_DOMAINrx   r�   r   ÚREASON_BAD_REFERERÚgeturlZget_portr   )rA   r9   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_messageK  s    
z%CsrfViewMiddleware._bad_token_messagec              
   C   s8  z|   |¡}W n6 tyD } ztd|j› d�ƒ‚W Y d }~n
d }~0 0 |d u rVttƒ‚d}|jdkrŠz|j dd¡}W n tyˆ   Y n0 |dkrÆz|j	t
j }W n ty¼   ttƒ‚Y n0 t
j}nd}zt|ƒ}W n< t�y } z"|  |j|¡}t|ƒ‚W Y d }~n
d }~0 0 t||ƒ�s4|  d|¡}t|ƒ‚d S )NzCSRF cookie r‘   r'   r�   ZcsrfmiddlewaretokenZ	incorrect)rq   r=   rP   r?   ÚREASON_NO_CSRF_COOKIEÚmethodr�   rl   r   r6   r   ZCSRF_HEADER_NAMErp   ÚREASON_CSRF_TOKEN_MISSINGrL   r”   rO   )rA   r9   rN   ÚexcrM   r’   r?   r   r   r   Ú_check_tokenR  s6    (
zCsrfViewMiddleware._check_tokenc                 C   s@   z|   |¡}W n ty(   t|ƒ Y n0 |d ur<||jd< d S )Nr4   )rq   r=   r:   r6   )rA   r9   rN   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v r4|  |¡S t |ddƒrJ|  |¡S d|jv rv|  |¡sÀ|  |t|jd  ¡S nJ| ¡ rÀz|  |¡ W n2 t	y¾ } z|  ||j
¡W  Y d }~S d }~0 0 z|  |¡ W n4 t	�y } z|  ||j
¡W  Y d }~S d }~0 0 |  |¡S )Nrd   FZcsrf_exempt)ÚGETÚHEADÚOPTIONSÚTRACEZ_dont_enforce_csrf_checksr{   )Úgetattrr–   re   r6   r…   ri   ÚREASON_BAD_ORIGINr‚   rŽ   rP   r?   r™   )rA   r9   ÚcallbackÚcallback_argsÚcallback_kwargsr˜   r   r   r   Úprocess_viewŒ  s.    




ÿ$$zCsrfViewMiddleware.process_viewc                 C   s&   |j  d¡r"|  ||¡ d|j d< |S )Nr5   F)r6   rl   rz   ry   r   r   r   Úprocess_responseÅ  s    
z#CsrfViewMiddleware.process_responseN)rD   rE   rF   Ú__doc__r   r\   r^   rb   re   ri   rq   rz   r…   rŽ   r”   r™   rš   r¤   r¥   r   r   r   r   rQ   ¡   s$   


-0
9rQ   )@r¦   ÚloggingÚstringÚcollectionsr   Úurllib.parser   Zdjango.confr   Zdjango.core.exceptionsr   r   Zdjango.httpr   Zdjango.http.requestr	   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    r‰   rŒ   r•   r—   rŠ   r‹   rH   rK   r   rG   Úascii_lettersÚdigitsr   rm   r   r   r1   r3   r:   r;   r<   Ú	Exceptionr=   rL   rO   rP   rQ   r   r   r   r   Ú<module>   sX   
ÿ	