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Editing: avc_audit.cpython-36.pyc
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3 �h>`�; � @ s d ddgZ ddlmZ ddlmZ ddlZddlZddlZddlZddlZ ddl Z ddl m Z ddl Z ddlZddlmZ dd lmZ dd lT dd lT dd lT yeed � W n ek r� d e_Y nX eej� d �Zdd� Z G dd� de�Z G dd � d e j �Z dS )�AuditSocketReceiverThread�AuditRecordReceiver� verify_avc� )�str)�objectN)�_thread)� cmp_to_key)� get_config)�*� AUDIT_EOEi( � c C sp | j jd ks| jjd kr dS tj| j jkrltjtjdt| j f � tjtjd| jj� � dd l}|j d� dS )NFzUsetroubleshoot generated AVC, exiting to avoid recursion, context=%s, AVC scontext=%szaudit event %sr T) Zscontext�typeZtcontext� my_context�syslog�LOG_ERR� audit_event�format�sys�exit)�avcr � r � /usr/lib/python3.6/avc_audit.pyr 7 s c @ sx e Zd ZdZdZdd� Zdd� Zdd� Zd d � Zd d � Z d d� Z dd� Z dd� Z d dd�Z d dd�Zdd� Zdd� ZdS ) r aO The audit system emits messages about a single event independently. Thus one single auditable event may be composed from one or more individual audit messages. Each audit message is prefixed with a unique event id, which includes a timestamp. The last audit message associated with an event is not marked in any fashion. Audit messages for a specific event may arrive interleaved with audit messages for other events. It is the job of higher level software (this code) to assemble the audit messages into events. The AuditEvent class is used for assembly. When a new event id is seen a new AuditEvent object is created, then every time an audit message arrives with that event id it is added to that object. The AuditEvent object contains the timestamp associated with the audit event as well as other data items useful for processing and handling the event. The audit system does not tell us when the last message belonging to an event has been emitted so we have no explicit way of knowing when the audit event has been fully assembled from its constituent message parts. We use the heuristic if a sufficient length of time has expired since we last saw a message for this event, then it must be complete Thus when audit events are created we place them in a cache where they will reside until their time to live has expired at which point we will assume they are complete and emit the event. Events are expired in the flush_cache() method. The events resident in the cache are sorted by their timestamps. A time threshold is established. Any events in the cache older than the time threshold are flushed from the cache as complete events. When should flushes be performed? The moment when a new message is added would seem a likely candidate moment to perform a sweep of the cache. But this is costly and does not improve how quickly events are expired. We could wait some interval of time (something much greater than how long we expect it would take for messages percolate) and this has good behavior, except for the following case. Sometimes messages are emitted by audit in rapid succession. If we swept the cache once a second then the cache may have grown quite large. Since it is very likely that any given audit event is complete by the time the next several events start arriving we can optimize by tracking how many messages have arrived since the last time we swept the cache. The the heuristic for when to sweep the cache becomes: If we've seen a sufficient number of messages then sweep -or- if a sufficient length of time has elapsed then we sweep Note that when audit messages are injected via log file scanning elapsed wall clock time has no meaning relative to when to perform the cache sweep. However, the timestamp for an event remains a critical factor when deciding if an event is complete (have we scanned far enough ahead such we're confident we won't see any more messages for this event?). Thus the threshold for when to expire an event from the cache during static log file scanning is determined not by wall clock time but rather by the oldest timestamp in the cache (e.g.there is enough spread between timestamps in the cache its reasonable to assume the event is complete). One might ask in the case of log file scanning why not fill the cache until EOF is reached and then sweep the cache? Because in log files it is not unusual to have thousands or tens of thousands of events and the cache would grown needlessly large. Because we have to deal with the real time case we already have code to keep only the most recent events in the cache so we might as well use that logic, keep the code paths the same and minimize resource usage. g{�G�zt?c C s$ d| _ d| _i | _g | _| j� d S )N� r )� flush_size� flush_count�cache�events�reset_statistics)�selfr r r �__init__� s z AuditRecordReceiver.__init__c C s t | j�S )N)�lenr )r r r r �num_cached_events� s z%AuditRecordReceiver.num_cached_eventsc C s d| _ d| _d S )Nr )�max_cache_length� event_count)r r r r r � s z$AuditRecordReceiver.reset_statisticsc C s t � }|| jt|j�< |S )N)Z AuditEventr r �event_id)r �recordr r r r �insert_new_event� s z$AuditRecordReceiver.insert_new_eventc C s | j jt|j�d �S )N)r �getr r$ )r r% r r r �get_event_from_record� s z)AuditRecordReceiver.get_event_from_recordc C sZ t d| jj|f � | j|�}|jdkr:|r6| j|� d S |d krL| j|�}|j|� d S )Nz %s.add_record_to_cache(): %s�EOE)� log_debug� __class__�__name__r( � record_type� flush_eventr& Z add_record)r r% r r r r �add_record_to_cache� s z'AuditRecordReceiver.add_record_to_cachec C s | j d7 _ | jjd|� d S )Nr r )r# r �insert)r r r r r � emit_event� s z AuditRecordReceiver.emit_eventc C s | j |� | jt|j�= d S )N)r1 r r r$ )r r r r r r. � s z AuditRecordReceiver.flush_eventNc s� t � j�dkrdS t � j�� jkr.t � j�� _t� jj� �}|dkrjx |D ]}� j| }� j|� qJW dS |jt� fdd��d� |dkr�� j|d j� j }x*|D ]"}� j| }|j|k r�� j|� q�W dS )al Flush events from the cache if they are older than the threshold age. If the threshold age is None then the threshold age is set to the age of the newest event in the cache minus the cache time to live, in other words anything in the cache which is older than the time to live relative to the most current event is flushed. r Nc s � j | j� j | jk S )N)r � timestamp)�a�b)r r r �<lambda>� s z1AuditRecordReceiver.flush_cache.<locals>.<lambda>)�keyr ���) r r r" �list�keysr. �sortr r2 �cache_time_to_live)r � threshold_ageZ event_idsr$ r r )r r � flush_cache� s" z AuditRecordReceiver.flush_cachec c s8 | j |� d| _x"t| j�dkr2| jj� }|V qW d S )Nr )r= r r r �pop)r r< r r r r �flush� s zAuditRecordReceiver.flushc c s x| j d�D ] }|V q W dS )z{Emit every event in the cache irrespective of its timestamp. This means we're done, nothing should remain buffered.r N)r? )r r r r r �close� s zAuditRecordReceiver.closec c sn | j d7 _ |jd kr"| j|� | j | jkrFx| j� D ] }|V q8W x"t| j�d krh| jj� }|V qHW d S ) z9Accept a new audit record into the system for processing.r �AVC�AVC_PATH�SYSCALL�CWD�PATHr) �1400�1107r N)rA rB rC rD rE r) rF rG )r r- r/ r r? r r r> )r r% r r r r �feed� s zAuditRecordReceiver.feed)N)N)r, � __module__� __qualname__�__doc__r; r r! r r& r( r/ r1 r. r= r? r@ rH r r r r r F s E " c @ s< e Zd Zdd� Zdd� Zdd� Zdd� Zd d � Zd d � Zd S )r c C sF t jj| � || _|| _t� | _tddt�| _ | j � d| _ d| _ d S )N�audit�retry_interval� F) � threading�Threadr �queue�report_receiverr �record_receiverr �intrM �get_socket_paths�timeout_interval� has_audit_eoe)r rQ rR r r r r s z"AuditSocketReceiverThread.__init__c C s6 g | _ tdd�}| j j|� tdd�}| j j|� d S )NrL Ztext_protocol_socket_pathZbinary_protocol_socket_path)�audit_socket_pathsr �append)r �audit_socket_pathr r r rU s z*AuditSocketReceiverThread.get_socket_pathsc C s� �x~y�x�| j D ]�| _| jd k ryjt| j�}t|�| _tjtjtj�| _ t j | j j � t j t j � | j j| j� | j j� | _td| j � d S tjk r� } z$t|�\}}td| j|f � W Y d d }~X qX qW tddj| j �| jf � W n� tjk �r4 } z(t|�\}}td| j|| jf � W Y d d }~X n> tk �rp } z td| j|d | jf � W Y d d }~X nX tj| j� qW d S )Nzaudit socket (%s) connectedz4attempt to open audit socket (%s) failed, error='%s'z:could not open any audit sockets (%s), retry in %d secondsz, z9audit socket (%s) failed, error='%s', retry in %d secondsr )rX rZ Zderive_record_formatZAuditRecordReader� record_reader�Socket�socketZAF_UNIXZ SOCK_STREAM� audit_socket�fcntl�filenoZF_SETFDZ FD_CLOEXEC�connect�makefile�audit_socket_fdr* �errorZ get_error_from_socket_exception�joinrM �OSError�timeZsleep)r Z record_format�e�errno�strerrorr r r ra s. ( &,z!AuditSocketReceiverThread.connectc C s< t |||||�}|j� x | jj|�D ]}| j|� q&W dS )z"called to enter a new audit recordN)Z AuditRecordZaudispd_rectifyrS rH �new_audit_event_handler)r r- r$ � body_text�fields� line_numberZ audit_recordr r r r �new_audit_record_handler1 s z2AuditSocketReceiverThread.new_audit_record_handlerc C sD |j � r@|j� r@|j� dkr@t|�}t|�r@| jj|| jf� d S )Nr )Zis_avcZ is_grantedZ num_recordsrA r rQ ZputrR )r r r r r r rk 9 s z1AuditSocketReceiverThread.new_audit_event_handlerc C s� | j � | j}�x�tj| jgg g |�\}}}y�| j|kr�dd l}|j| jj� d�}|dkrltd� | j � nbtd| j j � � | j s�| j}x�| j j |�D ]2\}}} } } |dkr�d| _ d }| j||| | | � q�W n>x(| j jtj� | j �D ]} | j| � q�W | j j � dk�rd }W q tk �rL } z td| jj � tj� W Y d d } ~ X q tk �r� } z td | jj � tj� W Y d d } ~ X q tk �r� } z6dd l}t|j� � t j t j d | jjt | �f � d S d } ~ X qX qW d S ) Nr i � z audit socket connection droppedz cached audit event count = %dr) Tz!KeyboardInterrupt exception in %szSystemExit exception in %szexception %s: %s) ra rV �selectr^ �os�readrc r` r* rS r! rW r[ rH ro r? rg rk �KeyboardInterruptr+ r, r �interrupt_main� SystemExit� Exception� tracebackZ syslog_trace� format_excr r r )r ZtimeoutZinListZoutListZerrListrr Znew_datar- r$ rl rm rn r rh rx r r r �run? sD z AuditSocketReceiverThread.runN) r, rI rJ r rU ra ro rk rz r r r r r � s ) �__all__�builtinsr r r rL rq Zselinuxr] r\ r_ Z six.movesr rO rg � functoolsr Zsetroubleshoot.configr Zsetroubleshoot.errcodeZsetroubleshoot.utilZsetroubleshoot.audit_data�getattr�AttributeErrorr Z AvcContextZgetconr r r rP r r r r r �<module> s6 9
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