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Filename :
interfaces.cpython-39.pyc
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a B�iP@ � @ s� d Z ddlZddlZddlmZ ddlmZ ddlmZ ddlmZ ddlm Z G d d � d �Z d d � Z d d� Z dd� Z dd� Zdd� ZG dd� d�ZG dd� d�ZG dd� d�ZG dd � d �ZdS ) z7 Classes for representing and manipulating interfaces. � N� )�access)� refpolicy)� objectmodel)�matching)�_c @ sH e Zd ZdZdd� Zdd� Zdd� Zeee�Zedd � d �Z d d � Z d S )�Paramz; Object representing a parameter for an interface. c C s" d| _ tj| _t�� | _d| _d S )N� T)� _Param__namer �SRC_TYPE�type�IdSet� obj_classes�required��self� r �7/usr/lib/python3.9/site-packages/sepolgen/interfaces.py�__init__& s zParam.__init__c C s t �|�std| ��|| _d S )NzName [%s] is not a param)r � is_idparam� ValueErrorr )r �namer r r �set_name, s zParam.set_namec C s | j S �N)r r r r r �get_name1 s zParam.get_namec C s t | jdd � �S �Nr )�intr r r r r �<lambda>6 � zParam.<lambda>)�fgetc C s d| j tj| j d�| j�f S )Nz0<sepolgen.policygen.Param instance [%s, %s, %s]>� )r r � field_to_strr �joinr r r r r �__repr__8 s �zParam.__repr__N) �__name__� __module__� __qualname__�__doc__r r r �propertyr �numr# r r r r r " s r c C s� d}| |v r�|| }||j kr"d S |tjks6|tjkr�|j tjksN|j tjkr�d}|r`|jg}ng }t�|j|�D ]}|tj v rrd} q�qrtj|_ q�d}n t � }| |_ ||_ |||j < |r�|j� |j� |S �Nr r ) r r r �TGT_TYPE� obj_class� itertools�chainr r Zimplicitly_typed_objectsr r �add)r r �av�params�ret�pZavobjs�objr r r �__param_insert> s6 � � r5 c C s~ d}d}t �| j�r.t| jtj| |�dkr.d}t �| j�rTt| jtj| |�dkrTd}t �| j�rzt| jtj | |�dkrzd}|S )aj Extract the parameters from an access vector. Extract the parameters (in the form $N) from an access vector, storing them as Param objects in a dictionary. Some attempt is made at resolving conflicts with other entries in the dict, but if an unresolvable conflict is found it is reported to the caller. The goal here is to figure out how interface parameters are actually used in the interface - e.g., that $1 is a domain used as a SRC_TYPE. In general an interface will look like this: interface(`foo', ` allow $1 foo : file read; ') This is simple to figure out - $1 is a SRC_TYPE. A few interfaces are more complex, for example: interface(`foo_trans',` domain_auto_trans($1,fingerd_exec_t,fingerd_t) allow $1 fingerd_t:fd use; allow fingerd_t $1:fd use; allow fingerd_t $1:fifo_file rw_file_perms; allow fingerd_t $1:process sigchld; ') Here the usage seems ambiguous, but it is not. $1 is still domain and therefore should be returned as a SRC_TYPE. Returns: 0 - success 1 - conflict found r Fr ) r r �src_typer5 r r �tgt_typer+ r, � OBJ_CLASS)r0 r1 r2 Z found_srcr r r �av_extract_paramsj s $ r9 c C s" t �| j�r t| jtjd |�S d S r )r r �roler5 r ZROLE)r: r1 r r r �role_extract_params� s r; c sl � fdd�}d}|| j tj�r"d}|| jtj�r4d}|| jtj�rFd}t�| j �rht | j tj d � �rhd}|S )Nc s. d}| D ] }t �|�rt||d � �rd}q|S r* )r r r5 )�setr r2 �x�r1 r r �extract_from_set� s z2type_rule_extract_params.<locals>.extract_from_setr r ) � src_typesr r � tgt_typesr+ r r8 r r Z dest_typer5 Z DEST_TYPE)�ruler1 r? r2 r r> r �type_rule_extract_params� s rC c C s2 d}| j D ]"}t�|�r t|tjd |�r d}q |S r* )�argsr r r5 r r )�ifcallr1 r2 �argr r r �ifcall_extract_params� s rG c @ s e Zd Zdd� Zdd� ZdS )�AttributeVectorc C s d| _ t�� | _d S )Nr )r r �AccessVectorSetr r r r r � s zAttributeVector.__init__c C s | j �|� d S r )r �add_av�r r0 r r r rJ � s zAttributeVector.add_avN)r$ r% r& r rJ r r r r rH � s rH c @ s$ e Zd Zdd� Zdd� Zdd� ZdS )� AttributeSetc C s i | _ d S r )� attributesr r r r r � s zAttributeSet.__init__c C s || j |j< d S r )rM r )r �attrr r r �add_attr� s zAttributeSet.add_attrc C sz dd� }d }|D ]V}|d d� }|d dkrD|r:| � |� ||�}q|r|�d�}t�|�}|�|� q|rv| � |� d S )Nc S sH | dd� � � }t|�dks(|d dkr4td| ��t� }|d |_|S )Nr ���� r Z Attributez#Syntax error Attribute statement %s)�split�len� SyntaxErrorrH r )�line�fields�ar r r � parse_attr� s z*AttributeSet.from_file.<locals>.parse_attrrP r �[�,)rO rR r � AccessVectorrJ )r �fdrX rW rU �lr0 r r r � from_file� s zAttributeSet.from_fileN)r$ r% r& r rO r^ r r r r rL � s rL c @ sF e Zd Zdi fdd�Zi fdd�Zdd� Zdd � Zd d � Zd d � ZdS )�InterfaceVectorNc C s6 d| _ d| _t�� | _i | _|r,| �||� d| _d S )NTr F)�enabledr r rI r1 �from_interface�expanded)r � interfacerM r r r r � s zInterfaceVector.__init__c C s" |j | _ |�� D ]>}|jtjjkr$qd|j v r0qt�|�}|D ]}| �|� q>q|r�|� � D ]n}|j D ]b}||j vrvqf|j | }|jD ]@} t � | �}|j |j kr�|j |_ |j|j kr�|j |_| �|� q�qfq\|�� D ]} t| | j�r�q�|�� D ]} t| | j�r�q�|�� D ]} t| | j��r�qd S )NZ dontaudit)r ZavrulesZ rule_typer ZAVRuleZALLOWr Zavrule_to_access_vectorsrJ ZtypeattributesrM �copyr6 r r7 Zrolesr; r1 Z typerulesrC �interface_callsrG ) r rc rM ZavruleZavsr0 Z typeattributerN Zattr_vecrW r: rB rE r r r ra � s> z InterfaceVector.from_interfacec C s t || j�dkr| j�|� d S r )r9 r1 r rJ rK r r r rJ 3 s zInterfaceVector.add_avc C s8 g }|� d| j � | jD ]}|� t|�� qd�|�S )Nz[InterfaceVector %s]� )�appendr r �strr" )r �sr0 r r r � to_string9 s zInterfaceVector.to_stringc C s | � � S r )r# r r r r �__str__@ s zInterfaceVector.__str__c C s d| j | jf S )Nz<InterfaceVector %s:%s>)r r` r r r r r# C s zInterfaceVector.__repr__) r$ r% r& r ra rJ rj rk r# r r r r r_ � s 4r_ c @ sx e Zd Zddd�Zdd� Zdd� Zdd � Zd d � Zd d � Zi fdd�Z di fdd�Z dd� Z dd� Z dd� Z dd� ZdS )� InterfaceSetNc C s i | _ i | _g | _|| _d S r )� interfaces� tgt_type_map� tgt_type_all�output)r rp r r r r H s zInterfaceSet.__init__c C s | j r| j �|d � d S )Nrf )rp �write)r rh r r r �oN s zInterfaceSet.oc C s� t | j�� dd� d�D ]�}|�d|j � t |j�� dd� d�D ] }|�d|jtj|j f � q@|�d� t |j � � �}|D ] }|�d� |�� |�d � q~qd S ) Nc S s | j S r �r �r= r r r r S r z&InterfaceSet.to_file.<locals>.<lambda>)�keyz[InterfaceVector %s c S s | j S r rs rt r r r r U r z%s:%s z] rZ rf ) �sortedrm �valuesrq r r1 r r! r r Zto_listr" )r r\ Ziv�paramZavlr0 r r r �to_fileR s zInterfaceSet.to_filec C s� dd� }d }|D ]V}|d d� }|d dkrD|r:| � |� ||�}q|r|�d�}t�|�}|�|� q|rv| � |� | �� d S )Nc S s� | dd� � � }t|�dk s(|d dkr4td| ��t� }|d |_t|�dkrTd S |dd � D ]R}|� d�}t|�dkr�td| ��t� }|d |_tj|d |_||j |j< q`|S ) Nr rP rQ r r_ z)Syntax error InterfaceVector statement %s�:z-Invalid param in InterfaceVector statement %s) rR rS rT r_ r r r Z str_to_fieldr r1 )rU rV �ifvZfieldr3 rx r r r � parse_ifv^ s z)InterfaceSet.from_file.<locals>.parse_ifvrP r rY rZ )�add_ifvrR r r[ rJ �index)r r\ r| r{ rU r] r0 r r r r^ ] s zInterfaceSet.from_filec C s || j |j< d S r )rm r )r r{ r r r r} � s zInterfaceSet.add_ifvc C sv | j �� D ]f}t� }|jD ]2}t�|j�r@| j�|� t� } qN|�|j� q|D ] }| j � |g �}|�|� qRq d S r ) rm rw r< r r r7 ro rg r/ rn � setdefault)r r{ rA r0 r r] r r r r~ � s zInterfaceSet.indexc C s t ||�}| �|� d S r )r_ r} )r rc rM r{ r r r r/ � s zInterfaceSet.addc C s< t �|�� |�� �D ]}| �||� q| �|� | �� d S r )r- r. rm � templatesr/ �expand_ifcallsr~ )r �headersrp rM �ir r r � add_headers� s zInterfaceSet.add_headersc C sZ t �|�rPt|dd � �}|t|j�kr,d S |j|d }t|t�rH|S |gS n|gS d S r )r r r rS rD � isinstance�list)r �idrE r) rF r r r � map_param� s zInterfaceSet.map_paramc C s� | � |j|�}|d u rd S | � |j|�}|d u r4d S | � |j|�}|d u rNd S t�� }|jD ]&}| � ||�} | d u rxq\q\|�| � q\t|�dkr�d S |D ]*} |D ] } |D ]} |j � | | | |� q�q�q�d S )Nr ) r� r6 r7 r, r r Zperms�updaterS r r/ ) r r{ r0 rE r@ rA r Z new_permsZpermr3 r6 r7 r, r r r � map_add_av� s* zInterfaceSet.map_add_avc C s� |d fg}| j |j }d|_t|�dkr�|�d�\}}| j |j }||krl|jD ]}| �|||� qP|jrlq |�� D ]l} | j|jkr�| � t d�� d S z|| j } W n* t y� | � t d| j �� Y qtY n0 |� | | f� qtq d S )NTr rP z Found circular interface classz#Missing interface definition for %s) rm r rb rS �popr r� re Zifnamerr r �KeyErrorrg ) r rc � if_by_name�stackr{ ZcurZ cur_ifcallZcur_ifvr0 rE Znewifr r r �do_expand_ifcalls� s* z InterfaceSet.do_expand_ifcallsc C sR i }t �|�� |�� �D ]}|||j< qt �|�� |�� �D ]}| �||� q<d S r )r- r. rm r� r r� )r r� r� r� rc r r r r� � s zInterfaceSet.expand_ifcalls)N)r$ r% r& r rr ry r^ r} r~ r/ r� r� r� r� r� r r r r rl G s # $rl )r' rd r- r r r r r Z sepolgeni18nr r r5 r9 r; rC rG rH rL r_ rl r r r r �<module> s" ,4 Z