mirror of https://github.com/MISP/MISP
628 lines
28 KiB
PHP
Executable File
628 lines
28 KiB
PHP
Executable File
<?php
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App::uses('AppModel', 'Model');
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App::uses('Folder', 'Utility');
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App::uses('File', 'Utility');
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/**
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* Attribute Model
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*
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* @property Event $Event
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*/
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class Attribute extends AppModel {
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var $combinedKeys = array('event_id', 'category', 'type');
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var $name = 'Attribute'; // TODO general
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var $actsAs = array('Logable' => array( // TODO Audit, logable
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'userModel' => 'User',
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'userKey' => 'user_id',
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'change' => 'full'
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));
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/**
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* Display field
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*
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* @var string
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*/
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public $displayField = 'value';
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public $virtualFields = array(
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'value' => 'IF (Attribute.value2="", Attribute.value1, CONCAT(Attribute.value1, "|", Attribute.value2))',
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'category_order' => 'IF (Attribute.category="Internal reference", "a",
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IF (Attribute.category="Antivirus detection", "b",
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IF (Attribute.category="Payload delivery", "c",
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IF (Attribute.category="Payload installation", "d",
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IF (Attribute.category="Artifacts dropped", "e",
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IF (Attribute.category="Persistence mechanism", "f",
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IF (Attribute.category="Network activity", "g",
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IF (Attribute.category="Payload type", "h",
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IF (Attribute.category="Attribution", "i",
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IF (Attribute.category="External analysis", "j", "k"))))))))))'
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); // TODO hardcoded
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/**
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* Description field
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*
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* @var array
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*/
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// explanations of certain fields to be used in various views
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public $field_descriptions = array(
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'signature' => array('desc' => 'Is this attribute eligible to automatically create an IDS signature (network IDS or host IDS) out of it ?'),
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'private' => array('desc' => 'Prevents upload of this single Attribute to other CyDefSIG servers', 'formdesc' => 'Prevents upload of <em>this single Attribute</em> to other CyDefSIG servers.<br/>Used only when the Event is NOT set as Private')
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);
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// these are definition of possible types + their descriptions and maybe later other behaviors
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// e.g. if the attribute should be correlated with others or not
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// if these then a category my have upload to be zipped
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public $zipped_definitions = array(
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'malware-sample'
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);
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// if these then a category my have upload
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public $upload_definitions = array(
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'attachment'
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);
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public $type_definitions = array(
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'md5' => array('desc' => 'A checksum in md5 format', 'formdesc' => "You are encouraged to use filename|md5 instead. <br/>A checksum in md5 format, only use this if you don't know the correct filename"),
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'sha1' => array('desc' => 'A checksum in sha1 format', 'formdesc' => "You are encouraged to use filename|sha1 instead. <br/>A checksum in sha1 format, only use this if you don't know the correct filename"),
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'filename' => array('desc' => 'Filename'),
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'filename|md5' => array('desc' => 'A filename and an md5 hash separated by a |', 'formdesc' => "A filename and an md5 hash separated by a | (no spaces)"),
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'filename|sha1' => array('desc' => 'A filename and an sha1 hash separated by a |', 'formdesc' => "A filename and an sha1 hash separated by a | (no spaces)"),
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'ip-src' => array('desc' => "A source IP address of the attacker"),
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'ip-dst' => array('desc' => 'A destination IP address of the attacker or C&C server', 'formdesc' => "A destination IP address of the attacker or C&C server. <br/>Also set the IDS flag on when this IP is hardcoded in malware"),
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'hostname' => array('desc' => 'A full host/dnsname of an attacker', 'formdesc' => "A full host/dnsname of an attacker. <br/>Also set the IDS flag on when this hostname is hardcoded in malware"),
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'domain' => array('desc' => 'A domain name used in the malware', 'formdesc' => "A domain name used in the malware. <br/>Use this instead of hostname when the upper domain is <br/>important or can be used to create links between events."),
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'email-src' => array('desc' => "The email address (or domainname) used to send the malware."),
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'email-dst' => array('desc' => "A recipient email address", 'formdesc' => "A recipient email address that is not related to your constituency."),
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'email-subject' => array('desc' => "The subject of the email"),
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'email-attachment' => array('desc' => "File name of the email attachment."),
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'url' => array('desc' => 'url'),
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'user-agent' => array('desc' => "The user-agent used by the malware in the HTTP request."),
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'regkey' => array('desc' => "Registry key or value"),
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'regkey|value' => array('desc' => "Registry value + data separated by |"),
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'AS' => array('desc' => 'Autonomous system'),
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'snort' => array('desc' => 'An IDS rule in Snort rule-format', 'formdesc' => "An IDS rule in Snort rule-format. <br/>This rule will be automatically rewritten in the NIDS exports."),
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'pattern-in-file' => array('desc' => 'Pattern in file that identifies the malware'),
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'pattern-in-traffic' => array('desc' => 'Pattern in network traffic that identifies the malware'),
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'pattern-in-memory' => array('desc' => 'Pattern in memory dump that identifies the malware'),
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'vulnerability' => array('desc' => 'A reference to the vulnerability used in the exploit'),
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'attachment' => array('desc' => 'Attachment with external information', 'formdesc' => "Please upload files using the <em>Upload Attachment</em> button."),
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'malware-sample' => array('desc' => 'Attachment containing encrypted malware sample', 'formdesc' => "Please upload files using the <em>Upload Attachment</em> button."),
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'link' => array('desc' => 'Link to an external information'),
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'comment' => array('desc' => 'Comment or description in a human language', 'formdesc' => 'Comment or description in a human language. <br/> This will not be correlated with other attributes (NOT IMPLEMENTED YET)'),
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'text' => array('desc' => 'Name, ID or a reference'),
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'other' => array('desc' => 'Other attribute')
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);
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// definitions of categories
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public $category_definitions = array(
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'Internal reference' => array(
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'desc' => 'Reference used by the publishing party (e.g. ticket number)',
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'types' => array('link', 'comment', 'text', 'other')
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),
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'Antivirus detection' => array(
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'desc' => 'All the info about how the malware is detected by the antivirus products',
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'formdesc' => 'List of anti-virus vendors detecting the malware or information on detection performance (e.g. 13/43 or 67%).<br/>Attachment with list of detection or link to VirusTotal could be placed here as well.',
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'types' => array('link', 'comment', 'text', 'attachment', 'other')
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),
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'Payload delivery' => array(
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'desc' => 'Information about how the malware is delivered',
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'formdesc' => 'Information about the way the malware payload is initially delivered, <br/>for example information about the email or web-site, vulnerability used, originating IP etc. <br/>Malware sample itself should be attached here.',
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'types' => array('md5', 'sha1', 'filename', 'filename|md5', 'filename|sha1', 'ip-src', 'ip-dst', 'hostname', 'domain', 'email-src', 'email-dst', 'email-subject', 'email-attachment', 'url', 'ip-dst', 'user-agent', 'AS', 'pattern-in-file', 'pattern-in-traffic', 'attachment', 'malware-sample', 'link', 'comment', 'text', 'vulnerability', 'other')
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),
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'Artifacts dropped' => array(
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'desc' => 'Any artifact (files, registry keys etc.) dropped by the malware or other modifications to the system',
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'types' => array('md5', 'sha1', 'filename', 'filename|md5', 'filename|sha1', 'regkey', 'regkey|value', 'pattern-in-file', 'pattern-in-memory', 'attachment', 'malware-sample', 'comment', 'text', 'other')
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),
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'Payload installation' => array(
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'desc' => 'Info on where the malware gets installed in the system',
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'formdesc' => 'Location where the payload was placed in the system and the way it was installed.<br/>For example, a filename|md5 type attribute can be added here like this:<br/>c:\\windows\\system32\\malicious.exe|41d8cd98f00b204e9800998ecf8427e.',
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'types' => array('md5', 'sha1', 'filename', 'filename|md5', 'filename|sha1', 'pattern-in-file', 'pattern-in-traffic', 'pattern-in-memory', 'vulnerability', 'attachment', 'malware-sample', 'comment', 'text', 'other')
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),
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'Persistence mechanism' => array(
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'desc' => 'Mechanisms used by the malware to start at boot',
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'formdesc' => 'Mechanisms used by the malware to start at boot.<br/>This could be a registry key, legitimate driver modification, LNK file in startup',
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'types' => array('filename', 'regkey', 'regkey|value', 'comment', 'text', 'other')
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),
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'Network activity' => array(
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'desc' => 'Information about network traffic generated by the malware',
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'types' => array('ip-src', 'ip-dst', 'hostname', 'domain', 'email-dst', 'url', 'user-agent', 'AS', 'snort', 'pattern-in-file', 'pattern-in-traffic', 'attachment', 'comment', 'text', 'other')
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),
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'Payload type' => array(
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'desc' => 'Information about the final payload(s)',
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'formdesc' => 'Information about the final payload(s).<br/>Can contain a function of the payload, e.g. keylogger, RAT, or a name if identified, such as Poison Ivy.',
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'types' => array('comment', 'text', 'other')
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),
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'Attribution' => array(
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'desc' => 'Identification of the group, organisation, or coountry behind the attack',
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'types' => array('comment', 'text', 'other')
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),
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'External analysis' => array(
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'desc' => 'Any other result from additional analysis of the malware like tools output',
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'formdesc' => 'Any other result from additional analysis of the malware like tools output<br/>Examples: pdf-parser output, automated sandbox analysis, reverse engineering report.',
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'types' => array('md5', 'sha1', 'filename', 'filename|md5', 'filename|sha1', 'ip-src', 'ip-dst', 'hostname', 'domain', 'url', 'user-agent', 'regkey', 'regkey|value', 'AS', 'snort', 'pattern-in-file', 'pattern-in-traffic', 'pattern-in-memory', 'vulnerability', 'attachment', 'malware-sample', 'link', 'comment', 'text', 'other')
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),
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'Other' => array(
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'desc' => 'Attributes that are not part of any other category',
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'types' => array('comment', 'text', 'other')
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)
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);
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var $order = array("Attribute.event_id" => "DESC", "Attribute.type" => "ASC");
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/**
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* Validation rules
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*
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* @var array
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*/
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public $validate = array(
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'event_id' => array(
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'numeric' => array(
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'rule' => array('numeric'),
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//'message' => 'Your custom message here',
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//'allowEmpty' => false,
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//'required' => false,
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//'last' => false, // Stop validation after this rule
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//'on' => 'create', // Limit validation to 'create' or 'update' operations
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),
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),
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'type' => array(
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// currently when adding a new attribute type we need to change it in both places
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'rule' => array('validateTypeValue'),
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'message' => 'Options depend on the selected category.',
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//'allowEmpty' => false,
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'required' => true,
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//'last' => false, // Stop validation after this rule
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//'on' => 'create', // Limit validation to 'create' or 'update' operations
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),
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// this could be initialized from category_definitions but dunno how at the moment
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'category' => array(
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'rule' => array('inList', array(
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'Internal reference',
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'Antivirus detection',
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'Payload delivery',
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'Payload installation',
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'Artifacts dropped',
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'Persistence mechanism',
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'Network activity',
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'Payload type',
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'Attribution',
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'External analysis',
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'Other',
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'' // FIXME remove this once all attributes have a category. Otherwise sigs without category are not shown in the list
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)),
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'message' => 'Options : Payload delivery, Antivirus detection, Payload installation, Files dropped ...'
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),
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'value' => array(
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'notempty' => array(
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'rule' => array('notempty'),
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'message' => 'Please fill in this field',
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//'allowEmpty' => false,
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//'required' => false,
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//'last' => false, // Stop validation after this rule
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//'on' => 'create', // Limit validation to 'create' or 'update' operations
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),
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'userdefined' => array(
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'rule' => array('validateAttributeValue'),
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'message' => 'Value not in the right type/format. Please double check the value or select "other" for a type.',
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//'allowEmpty' => false,
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//'required' => true,
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//'last' => false, // Stop validation after this rule
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//'on' => 'create', // Limit validation to 'create' or 'update' operations
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),
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'unique' => array(
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'rule' => array('valueIsUnique'),
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'message' => 'A similar attribute already exists for this event.',
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//'allowEmpty' => false,
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//'required' => true,
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//'last' => false, // Stop validation after this rule
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//'on' => 'create', // Limit validation to 'create' or 'update' operations
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),
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),
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'to_ids' => array(
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'boolean' => array(
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'rule' => array('boolean'),
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//'message' => 'Your custom message here',
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//'allowEmpty' => false,
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'required' => false,
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//'last' => false, // Stop validation after this rule
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//'on' => 'create', // Limit validation to 'create' or 'update' operations
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),
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),
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'uuid' => array(
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'uuid' => array(
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'rule' => array('uuid'),
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//'message' => 'Your custom message here',
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//'allowEmpty' => false,
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//'required' => false,
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//'last' => false, // Stop validation after this rule
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//'on' => 'create', // Limit validation to 'create' or 'update' operations
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),
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),
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'revision' => array(
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'numeric' => array(
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'rule' => array('numeric'),
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//'message' => 'Your custom message here',
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//'allowEmpty' => false,
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//'required' => false,
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//'last' => false, // Stop validation after this rule
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//'on' => 'create', // Limit validation to 'create' or 'update' operations
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),
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),
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'private' => array(
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'boolean' => array(
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'rule' => array('boolean'),
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//'message' => 'Your custom message here',
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'allowEmpty' => true,
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'required' => false,
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//'last' => false, // Stop validation after this rule
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//'on' => 'create', // Limit validation to 'create' or 'update' operations
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),
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),
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);
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//The Associations below have been created with all possible keys, those that are not needed can be removed
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/**
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* belongsTo associations
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*
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* @var array
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*/
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public $belongsTo = array(
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'Event' => array(
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'className' => 'Event',
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'foreignKey' => 'event_id',
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'conditions' => '',
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'fields' => '',
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'order' => ''
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)
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);
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function beforeSave() {
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// increment the revision number
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if (empty($this->data['Attribute']['revision'])) $this->data['Attribute']['revision'] = 0;
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$this->data['Attribute']['revision'] = 1 + $this->data['Attribute']['revision'] ;
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// explode value of composite type in value1 and value2
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// or copy value to value1 if not composite type
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if (!empty($this->data['Attribute']['type'])) {
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$composite_types = $this->getCompositeTypes();
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// explode composite types in value1 and value2
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$pieces = explode('|', $this->data['Attribute']['value']);
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if (in_array($this->data['Attribute']['type'], $composite_types)) {
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if (2 != sizeof($pieces)) throw new InternalErrorException('Composite type, but value not explodable');
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$this->data['Attribute']['value1'] = $pieces[0];
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$this->data['Attribute']['value2'] = $pieces[1];
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} else {
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$total = implode('|', $pieces);
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$this->data['Attribute']['value1'] = $total;
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$this->data['Attribute']['value2'] = '';
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}
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}
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// always return true after a beforeSave()
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return true;
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}
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function afterSave() {
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$result = true;
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// if the 'data' field is set on the $this->data then save the data to the correct file
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if (isset($this->data['Attribute']['type']) && $this->typeIsAttachment($this->data['Attribute']['type']) && !empty($this->data['Attribute']['data'])) {
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$result = $result && $this->saveBase64EncodedAttachment($this->data['Attribute']);
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}
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return $result;
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}
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function beforeDelete() {
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// delete attachments from the disk
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$this->read(); // first read the attribute from the db
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if($this->typeIsAttachment($this->data['Attribute']['type'])) {
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// FIXME secure this filesystem access/delete by not allowing to change directories or go outside of the directory container.
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// only delete the file if it exists
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$filepath = APP."files/".$this->data['Attribute']['event_id']."/".$this->data['Attribute']['id'];
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$file = new File ($filepath);
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if($file->exists()) {
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if (!$file->delete()) {
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throw new InternalErrorException('Delete of file attachment failed. Please report to administrator.');
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}
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}
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}
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}
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function beforeValidate() {
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// remove leading and trailing blanks
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$this->data['Attribute']['value'] = trim($this->data['Attribute']['value']);
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switch($this->data['Attribute']['type']) {
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// lowercase these things
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case 'md5':
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case 'sha1':
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case 'domain':
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case 'hostname':
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$this->data['Attribute']['value'] = strtolower($this->data['Attribute']['value']);
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break;
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case 'filename|md5':
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case 'filename|sha1':
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$pieces = explode('|', $this->data['Attribute']['value']);
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$this->data['Attribute']['value'] = $pieces[0].'|'.strtolower($pieces[1]);
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break;
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}
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// generate UUID if it doesn't exist
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if (empty($this->data['Attribute']['uuid']))
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$this->data['Attribute']['uuid']= String::uuid();
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// always return true, otherwise the object cannot be saved
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return true;
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}
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function valueIsUnique ($fields) {
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$value = $fields['value'];
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$event_id = $this->data['Attribute']['event_id'];
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$type = $this->data['Attribute']['type'];
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$to_ids = $this->data['Attribute']['to_ids'];
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$category = $this->data['Attribute']['category'];
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// check if the attribute already exists in the same event
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$conditions = array('Attribute.event_id' => $event_id,
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'Attribute.type' => $type,
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'Attribute.category' => $category,
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'Attribute.value' => $value
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);
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if (isset($this->data['Attribute']['id']))
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$conditions['Attribute.id !='] = $this->data['Attribute']['id'];
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$params = array('recursive' => 0,
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'conditions' => $conditions,
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);
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if (0 != $this->find('count', $params) )
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return false;
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// Say everything is fine
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return true;
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}
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function validateTypeValue($fields) {
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$category = $this->data['Attribute']['category'];
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if (isset($this->category_definitions[$category]['types']))
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return in_array($fields['type'], $this->category_definitions[$category]['types']);
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return false;
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}
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function validateAttributeValue ($fields) {
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$value = $fields['value'];
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// check data validation
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switch($this->data['Attribute']['type']) {
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case 'md5':
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if (preg_match("#^[0-9a-f]{32}$#", $value))
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return true;
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return 'Checksum has invalid length or format. Please double check the value or select "other" for a type.';
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break;
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case 'sha1':
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if (preg_match("#^[0-9a-f]{40}$#", $value))
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return true;
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return 'Checksum has invalid length or format. Please double check the value or select "other" for a type.';
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break;
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case 'filename':
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// no newline
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if (preg_match("#\n#", $value))
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return true;
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break;
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case 'filename|md5':
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// no newline
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if (preg_match("#^.+\|[0-9a-f]{32}$#", $value))
|
|
return true;
|
|
return 'Checksum has invalid length or format. Please double check the value or select "other" for a type.';
|
|
break;
|
|
case 'filename|sha1':
|
|
// no newline
|
|
if (preg_match("#^.+\|[0-9a-f]{40}$#", $value))
|
|
return true;
|
|
return 'Checksum has invalid length or format. Please double check the value or select "other" for a type.';
|
|
break;
|
|
case 'ip-src':
|
|
$parts = explode("/", $value);
|
|
// [0] = the ip
|
|
// [1] = the network address
|
|
if (count($parts) <= 2 ) {
|
|
// ipv4 and ipv6 matching
|
|
if (filter_var($parts[0],FILTER_VALIDATE_IP)) {
|
|
// ip is validated, now check if we have a valid network mask
|
|
if (empty($parts[1]))
|
|
return true;
|
|
else if(is_numeric($parts[1]) && $parts[1] < 129)
|
|
return true;
|
|
}
|
|
}
|
|
return 'IP address has invalid format. Please double check the value or select "other" for a type.';
|
|
break;
|
|
case 'ip-dst':
|
|
$parts = explode("/", $value);
|
|
// [0] = the ip
|
|
// [1] = the network address
|
|
if (count($parts) <= 2 ) {
|
|
// ipv4 and ipv6 matching
|
|
if (filter_var($parts[0],FILTER_VALIDATE_IP)) {
|
|
// ip is validated, now check if we have a valid network mask
|
|
if (empty($parts[1]))
|
|
return true;
|
|
else if(is_numeric($parts[1]) && $parts[1] < 129)
|
|
return true;
|
|
}
|
|
}
|
|
return 'IP address has invalid format. Please double check the value or select "other" for a type.';
|
|
break;
|
|
case 'hostname':
|
|
case 'domain':
|
|
if(preg_match("#^[A-Z0-9.-]+\.[A-Z]{2,4}$#i", $value))
|
|
return true;
|
|
return 'Domain name has invalid format. Please double check the value or select "other" for a type.';
|
|
break;
|
|
case 'email-src':
|
|
// we don't use the native function to prevent issues with partial email addresses
|
|
if(preg_match("#^[A-Z0-9._%+-]*@[A-Z0-9.-]+\.[A-Z]{2,4}$#i", $value))
|
|
return true;
|
|
return 'Email address has invalid format. Please double check the value or select "other" for a type.';
|
|
break;
|
|
case 'email-dst':
|
|
// we don't use the native function to prevent issues with partial email addresses
|
|
if(preg_match("#^[A-Z0-9._%+-]*@[A-Z0-9.-]+\.[A-Z]{2,4}$#i", $value))
|
|
return true;
|
|
return 'Email address has invalid format. Please double check the value or select "other" for a type.';
|
|
break;
|
|
case 'email-subject':
|
|
// no newline
|
|
if (!preg_match("#\n#", $value))
|
|
return true;
|
|
break;
|
|
case 'email-attachment':
|
|
// no newline
|
|
if (!preg_match("#\n#", $value))
|
|
return true;
|
|
break;
|
|
case 'url':
|
|
// no newline
|
|
if (!preg_match("#\n#", $value))
|
|
return true;
|
|
break;
|
|
case 'user-agent':
|
|
// no newline
|
|
if (!preg_match("#\n#", $value))
|
|
return true;
|
|
break;
|
|
case 'regkey':
|
|
// no newline
|
|
if (!preg_match("#\n#", $value))
|
|
return true;
|
|
break;
|
|
case 'regkey|value':
|
|
// no newline
|
|
if (!preg_match("#.+\|.+#", $value))
|
|
return true;
|
|
break;
|
|
case 'snort':
|
|
// no validation yet. TODO implement data validation on snort attribute type
|
|
case 'other':
|
|
return true;
|
|
break;
|
|
}
|
|
|
|
// default action is to return false
|
|
return true;
|
|
|
|
}
|
|
|
|
function getCompositeTypes() {
|
|
// build the list of composite Attribute.type dynamically by checking if type contains a |
|
|
// default composite types
|
|
$composite_types = array('malware-sample'); // TODO hardcoded composite
|
|
// dynamically generated list
|
|
foreach (array_keys($this->type_definitions) as $type) {
|
|
$pieces = explode('|', $type);
|
|
if (2 == sizeof($pieces)) $composite_types[] = $type;
|
|
}
|
|
return $composite_types;
|
|
}
|
|
|
|
public function isOwnedByOrg($attributeid, $org) {
|
|
$this->id = $attributeid;
|
|
$this->read();
|
|
return $this->data['Event']['org'] === $org;
|
|
}
|
|
|
|
function getRelatedAttributes($attribute, $fields=array()) {
|
|
// LATER getRelatedAttributes($attribute) this might become a performance bottleneck
|
|
|
|
// exclude these specific categories to be linked
|
|
switch ($attribute['category']) {
|
|
case 'Antivirus detection':
|
|
return null;
|
|
}
|
|
// exclude these specific types to be linked
|
|
switch ($attribute['type']) {
|
|
case 'other':
|
|
case 'comment':
|
|
return null;
|
|
}
|
|
|
|
// prepare the conditions
|
|
$conditions = array(
|
|
'Attribute.event_id !=' => $attribute['event_id'],
|
|
// 'Attribute.type' => $attribute['type'], // do not filter on type
|
|
);
|
|
if (empty($attribute['value1'])) // prevent issues with empty fields
|
|
return null;
|
|
|
|
if (empty($attribute['value2'])) {
|
|
// no value2, only search for value 1
|
|
$conditions['OR'] = array(
|
|
'Attribute.value1' => $attribute['value1'],
|
|
'Attribute.value2' => $attribute['value1'],
|
|
);
|
|
} else {
|
|
// value2 also set, so search for both
|
|
$conditions['OR'] = array(
|
|
'Attribute.value1' => array($attribute['value1'],$attribute['value2']),
|
|
'Attribute.value2' => array($attribute['value1'],$attribute['value2']),
|
|
);
|
|
}
|
|
|
|
// do the search
|
|
if (empty($fields)) {
|
|
$fields = array('Attribute.*');
|
|
}
|
|
$similar_events = $this->find('all',array('conditions' => $conditions,
|
|
'fields' => $fields,
|
|
'recursive' => 0,
|
|
'group' => array('Attribute.event_id'),
|
|
'order' => 'Attribute.event_id DESC', )
|
|
);
|
|
return $similar_events;
|
|
}
|
|
|
|
function typeIsMalware($type) {
|
|
if (in_array($type, $this->zipped_definitions)) return true;
|
|
else return false;
|
|
}
|
|
|
|
function typeIsAttachment($type) {
|
|
if ((in_array($type, $this->zipped_definitions)) || (in_array($type, $this->upload_definitions))) return true;
|
|
else return false;
|
|
}
|
|
|
|
function base64EncodeAttachment($attribute) {
|
|
$filepath = APP."files/".$attribute['event_id']."/".$attribute['id'];
|
|
$file = new File($filepath);
|
|
if (!$file->exists()) return '';
|
|
$content = $file->read();
|
|
return base64_encode($content);
|
|
}
|
|
|
|
function saveBase64EncodedAttachment($attribute) {
|
|
$root_dir = APP.DS."files".DS.$attribute['event_id'];
|
|
$dir = new Folder($root_dir, true); // create directory structure
|
|
$destpath = $root_dir.DS.$attribute['id'];
|
|
$file = new File ($destpath, true); // create the file
|
|
$decoded_data = base64_decode($attribute['data']); // decode
|
|
if ($file->write($decoded_data)){ // save the data
|
|
return true;
|
|
} else {
|
|
// error
|
|
return false;
|
|
}
|
|
}
|
|
|
|
|
|
|
|
}
|