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3 Kl�fQ@ � @ 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 paramater for an interface. c C s" d| _ tj| _tj� | _d| _d S )N� T)� _Param__namer �SRC_TYPE�type�IdSet� obj_classesZrequired)�self� r � /usr/lib/python3.6/interfaces.py�__init__& s zParam.__init__c C s t j|�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 s zParam.<lambda>)�fgetc C s d| j tj| j dj| 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}| |kr�|| }||j kr"d S |tjks6|tjkr�|j tjksN|j tjkr�d}|r`|jg}ng }x&tj|j|�D ]}|tj krtd}P qtW tj|_ q�d}n t � }| |_ ||_ |||j < |r�|jj |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> s0 r/ c C s~ d}d}t j| j�r.t| jtj| |�dkr.d}t j| j�rTt| jtj| |�dkrTd}t j| j�rzt| jtj | |�dkrzd}|S )aj Extract the paramaters from an access vector. Extract the paramaters (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 ambigious, 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_typer/ r r �tgt_typer% r& � OBJ_CLASS)r* r+ r, Z found_srcr r r �av_extract_paramsj s $ r3 c C s" t j| j�r t| jtjd |�S d S )N)r r �roler/ r ZROLE)r4 r+ r r r �role_extract_params� s r5 c sl � fdd�}d}|| j tj�r"d}|| jtj�r4d}|| jtj�rFd}tj| j �rht | j tj d � �rhd}|S )Nc s2 d}x(| D ] }t j|�r t||d � �r d}q W |S )Nr r )r r r/ )�setr r, �x)r+ r r �extract_from_set� s z2type_rule_extract_params.<locals>.extract_from_setr r ) � src_typesr r � tgt_typesr% r r2 r r Z dest_typer/ Z DEST_TYPE)�ruler+ r8 r, r )r+ r �type_rule_extract_params� s r< c C s6 d}x,| j D ]"}tj|�r t|tjd |�r d}q W |S )Nr r )�argsr r r/ r r )�ifcallr+ r, �argr r r �ifcall_extract_params� s r@ c @ s e Zd Zdd� Zdd� ZdS )�AttributeVectorc C s d| _ tj� | _d S )Nr )r r �AccessVectorSet)r r r r r � s zAttributeVector.__init__c C s | j j|� d S )N)r �add_av)r r* r r r rC � s zAttributeVector.add_avN)r r r! r rC r r r r rA � s rA c @ s$ e Zd Zdd� Zdd� Zdd� ZdS )� AttributeSetc C s i | _ d S )N)� attributes)r r r r r � s zAttributeSet.__init__c C s || j |j< d S )N)rE r )r �attrr r r �add_attr� s zAttributeSet.add_attrc C s~ dd� }d }x^|D ]V}|d d� }|d dkrF|r<| j |� ||�}q|r|jd�}tj|�}|j|� qW |rz| j |� d S )Nc S sH | dd� j � }t|�dks(|d dkr4td| ��t� }|d |_|S )Nr � r Z Attributez#Syntax error Attribute statement %s���)�split�len� SyntaxErrorrA r )�line�fields�ar r r � parse_attr� s z*AttributeSet.from_file.<locals>.parse_attrr r �[�,rI )rG rJ r � AccessVectorrC )r �fdrP rO rM �lr* r r r � from_file� s zAttributeSet.from_fileN)r r r! r rG rV r r r r rD � s rD c @ sF e Zd Zdi fdd�Zi fdd�Zdd� Zdd � Zd d � Zd d � ZdS )�InterfaceVectorNc C s6 d| _ d| _tj� | _i | _|r,| j||� d| _d S )NTr F)�enabledr r rB r+ �from_interface�expanded)r � interfacerE r r r r � s zInterfaceVector.__init__c C sF |j | _ xN|j� D ]B}|jtjjkr&qd|j kr2qtj|�}x|D ]}| j|� qBW qW |r�x�|j � D ]v}xp|j D ]f}||j kr�qr|j | }xJ|jD ]@} t j | �}|j |j kr�|j |_ |j|j kr�|j |_| j|� q�W qrW qfW x |j� D ]} t| | j�r�q�W x |j� D ]} t| | j��r�qW x |j� D ]} t| | j��r*�q*W d S )NZ dontaudit)r ZavrulesZ rule_typer ZAVRuleZALLOWr Zavrule_to_access_vectorsrC ZtypeattributesrE �copyr0 r r1 Zrolesr5 r+ Z typerulesr< �interface_callsr@ ) r r[ rE ZavruleZavsr* Z typeattributerF Zattr_vecrO r4 r; r> r r r rY � s> z InterfaceVector.from_interfacec C s t || j�dkr| jj|� d S )Nr )r3 r+ r rC )r r* r r r rC 3 s zInterfaceVector.add_avc C s< g }|j d| j � x | jD ]}|j t|�� q W dj|�S )Nz[InterfaceVector %s]� )�appendr r �strr )r �sr* r r r � to_string9 s zInterfaceVector.to_stringc C s | j � S )N)r )r r r r �__str__@ s zInterfaceVector.__str__c C s d| j | jf S )Nz<InterfaceVector %s:%s>)r rX )r r r r r C s zInterfaceVector.__repr__) r r r! r rY rC rb rc r r r r r rW � s 4rW 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 )N)� interfaces� tgt_type_map� tgt_type_all�output)r rh r r r r H s zInterfaceSet.__init__c C s | j r| j j|d � d S )Nr^ )rh �write)r r` r r r �oN s zInterfaceSet.oc C s� x�t | jj� dd� d�D ]�}|jd|j � x:t |jj� dd� d�D ] }|jd|jtj|j f � qDW |jd� t |j j � �}x&|D ] }|jdj |�� |jd � q�W qW d S ) Nc S s | j S )N)r )r7 r r r r S s z&InterfaceSet.to_file.<locals>.<lambda>)�keyz[InterfaceVector %s c S s | j S )N)r )r7 r r r r U s z%s:%s z] rR r^ ) �sortedre �valuesri r r+ r r r r Zto_listr )r rT Ziv�paramZavlr* r r r �to_fileR s zInterfaceSet.to_filec C s� dd� }d }x^|D ]V}|d d� }|d dkrF|r<| j |� ||�}q|r|jd�}tj|�}|j|� qW |rz| j |� | j� d S )Nc S s� | dd� j � }t|�dk s(|d dkr4td| ��t� }|d |_t|�dkrTd S xb|dd � D ]R}|j d�}t|�dkr�td| ��t� }|d |_tj|d |_||j |j< qbW |S ) Nr rH r rW z)Syntax error InterfaceVector statement %s�:z-Invalid param in InterfaceVector statement %srI ) rJ rK rL rW r r r Z str_to_fieldr r+ )rM rN �ifvZfieldr- rn r r r � parse_ifv^ s z)InterfaceSet.from_file.<locals>.parse_ifvr r rQ rR rI )�add_ifvrJ r rS rC �index)r rT rr rq rM rU r* r r r rV ] s zInterfaceSet.from_filec C s || j |j< d S )N)re r )r rq r r r rs � s zInterfaceSet.add_ifvc C s� xz| j j� D ]l}t� }x:|jD ]0}tj|j�rB| jj|� t� }P |j|j� q W x$|D ] }| j j |g �}|j|� qXW q W d S )N) re rm r6 r r r1 rg r_ r) rf � setdefault)r rq r: r* r rU r r r rt � s zInterfaceSet.indexc C s t ||�}| j|� d S )N)rW rs )r r[ rE rq r r r r) � s zInterfaceSet.addc C s@ x(t j|j� |j� �D ]}| j||� qW | j|� | j� d S )N)r' r( re � templatesr) �expand_ifcallsrt )r �headersrh rE �ir r r � add_headers� s zInterfaceSet.add_headersc C sZ t j|�rPt|dd � �}|t|j�kr,d S |j|d }t|t�rH|S |gS n|gS d S )Nr )r r r rK r= � isinstance�list)r �idr> r$ r? r r r � map_param� s zInterfaceSet.map_paramc C s� | j |j|�}|d krd S | j |j|�}|d kr4d S | j |j|�}|d krNd S tj� }x0|jD ]&}| j ||�} | d krzq^q^|j| � q^W t|�dkr�d S x:|D ]2} x,|D ]$} x |D ]} |j j | | | |� q�W q�W q�W d S )Nr ) r~ r0 r1 r& r r Zperms�updaterK r r) ) r rq r* r> r9 r: r Z new_permsZpermr- r0 r1 r& r r r � map_add_av� s* zInterfaceSet.map_add_avc C s� |d fg}| j |j }d|_x�t|�dkr�|jd�\}}| j |j }||krrx |jD ]}| j|||� qTW |jrrq xv|j� D ]j} | j|jkr�| j t d�� d S y|| j } W n* t k r� | j t d| j �� w|Y nX |j | | f� q|W q W d S )NTr r z Found circular interface classz#Missing interface definition for %srI ) re r rZ rK �popr r� r] Zifnamerj r �KeyErrorr_ ) r r[ � if_by_name�stackrq ZcurZ cur_ifcallZcur_ifvr* r> Znewifr r r �do_expand_ifcalls� s* z InterfaceSet.do_expand_ifcallsc C sZ i }x&t j|j� |j� �D ]}|||j< qW x(t j|j� |j� �D ]}| j||� qBW d S )N)r' r( re rv r r� )r rx r� ry r[ r r r rw � s zInterfaceSet.expand_ifcalls)N)r r r! r rj ro rV rs rt r) rz r~ r� r� rw r r r r rd G s # $rd )r" r\ r' r r r r r Z sepolgeni18nr r r/ r3 r5 r< r@ rA rD rW rd r r r r �<module> s" ,4 Z
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