|
1
|
|
|
<?php |
|
2
|
|
|
|
|
3
|
|
|
namespace Apps\Model\Basic; |
|
4
|
|
|
|
|
5
|
|
|
use Ffcms\Core\Exception\NativeException; |
|
6
|
|
|
use Ffcms\Core\Exception\SyntaxException; |
|
7
|
|
|
use Ffcms\Core\Helper\FileSystem\File; |
|
8
|
|
|
|
|
9
|
|
|
class Antivirus |
|
10
|
|
|
{ |
|
11
|
|
|
const EXECUTE_LIMIT = 5; // in seconds |
|
12
|
|
|
const DEPRECATED_TIME = 3600; // actuality of scan list |
|
13
|
|
|
// file extensions to be scanned |
|
14
|
|
|
public $affectedExt = [ |
|
15
|
|
|
'.php', '.php3', '.phtml', |
|
16
|
|
|
'.htm', '.html', |
|
17
|
|
|
'.txt', '.js', '.pl', '.cgi', '.py', '.bash', '.sh', '.ssi', '.inc', '.pm', '.tpl' |
|
18
|
|
|
]; |
|
19
|
|
|
|
|
20
|
|
|
private $signatures; |
|
21
|
|
|
private $beginTime; |
|
22
|
|
|
private $scanFiles; |
|
23
|
|
|
|
|
24
|
|
|
private $infected; |
|
25
|
|
|
|
|
26
|
|
|
public function __construct() |
|
27
|
|
|
{ |
|
28
|
|
|
if (!File::exist('/Private/Antivirus/Signatures.xml')) { |
|
29
|
|
|
throw new NativeException('Antivirus signatures is not founded in: {root}/Private/Antivirus/Signatures.xml'); |
|
30
|
|
|
} |
|
31
|
|
|
|
|
32
|
|
|
$this->beginTime = time(); |
|
33
|
|
|
|
|
34
|
|
|
$this->signatures = new \DOMDocument(); |
|
35
|
|
|
$this->signatures->load(root . '/Private/Antivirus/Signatures.xml'); |
|
36
|
|
|
|
|
37
|
|
|
// list of files is not prepared, 1st iteration |
|
38
|
|
|
if (!File::exist('/Private/Antivirus/ScanFiles.json')) { |
|
39
|
|
|
$this->prepareScanlist(); |
|
40
|
|
|
} |
|
41
|
|
|
|
|
42
|
|
|
if (!File::exist('/Private/Antivirus/ScanFiles.json')) { |
|
43
|
|
|
throw new SyntaxException('Directory /Private/Antivirus/ can not be writed!'); |
|
44
|
|
|
} |
|
45
|
|
|
|
|
46
|
|
|
$this->scanFiles = json_decode(File::read('/Private/Antivirus/ScanFiles.json')); |
|
|
|
|
|
|
47
|
|
|
if (File::exist('/Private/Antivirus/Infected.json')) { |
|
48
|
|
|
$this->infected = (array)json_decode(File::read('/Private/Antivirus/Infected.json')); |
|
49
|
|
|
} |
|
50
|
|
|
} |
|
51
|
|
|
|
|
52
|
|
|
/** |
|
53
|
|
|
* Make scan of files with preparation and time limit |
|
54
|
|
|
* @return array |
|
55
|
|
|
*/ |
|
56
|
|
|
public function make() |
|
57
|
|
|
{ |
|
58
|
|
|
foreach ($this->scanFiles as $idx => $file) { |
|
59
|
|
|
$now = time(); |
|
60
|
|
|
// calculate time limit for scan per file |
|
61
|
|
|
if ($now - $this->beginTime >= static::EXECUTE_LIMIT) { |
|
62
|
|
|
break; |
|
63
|
|
|
} |
|
64
|
|
|
|
|
65
|
|
|
$this->scanContent($file); |
|
66
|
|
|
unset($this->scanFiles->$idx); |
|
67
|
|
|
} |
|
68
|
|
|
|
|
69
|
|
|
// write infected info |
|
70
|
|
|
File::write('/Private/Antivirus/Infected.json', json_encode($this->infected)); |
|
71
|
|
|
// refresh file list to scan ;) |
|
72
|
|
|
File::write('/Private/Antivirus/ScanFiles.json', json_encode($this->scanFiles)); |
|
73
|
|
|
|
|
74
|
|
|
return [ |
|
75
|
|
|
'left' => count(get_object_vars($this->scanFiles)), |
|
76
|
|
|
'detect' => count($this->infected) |
|
77
|
|
|
]; |
|
78
|
|
|
} |
|
79
|
|
|
|
|
80
|
|
|
/** |
|
81
|
|
|
* Scan signle file via defined $path |
|
82
|
|
|
* @param string $path |
|
83
|
|
|
* @return bool |
|
84
|
|
|
*/ |
|
85
|
|
|
private function scanContent($path) |
|
86
|
|
|
{ |
|
87
|
|
|
// get file content plain |
|
88
|
|
|
$content = File::read($path); |
|
89
|
|
|
|
|
90
|
|
|
// nothing to check |
|
91
|
|
|
if ($content === null || $content === false) { |
|
92
|
|
|
return false; |
|
93
|
|
|
} |
|
94
|
|
|
|
|
95
|
|
|
$normalized = $this->normalizeContent($content); |
|
96
|
|
|
|
|
97
|
|
|
// list malware signatures |
|
98
|
|
|
$db = $this->signatures->getElementsByTagName('signature'); |
|
99
|
|
|
$detected = false; |
|
100
|
|
|
foreach ($db as $sig) { |
|
101
|
|
|
$sigContent = $sig->nodeValue; |
|
102
|
|
|
$attr = $sig->attributes; |
|
103
|
|
|
$attrId = $attr->getNamedItem('id')->nodeValue; |
|
104
|
|
|
$attrFormat = $attr->getNamedItem('format')->nodeValue; |
|
105
|
|
|
$attrTitle = $attr->getNamedItem('title')->nodeValue; |
|
106
|
|
|
$attrSever = $attr->getNamedItem('sever')->nodeValue; |
|
107
|
|
|
|
|
108
|
|
|
switch ($attrFormat) { |
|
109
|
|
|
case 're': |
|
110
|
|
|
if ((preg_match('#(' . $sigContent . ')#smi', $content, $found, PREG_OFFSET_CAPTURE)) || |
|
111
|
|
|
(preg_match('#(' . $sigContent . ')#smi', $normalized, $found, PREG_OFFSET_CAPTURE)) |
|
112
|
|
|
) { |
|
113
|
|
|
$detected = true; |
|
114
|
|
|
$pos = $found[0][1]; |
|
115
|
|
|
$this->infected[$path][] = [ |
|
116
|
|
|
'pos' => (int)$pos, |
|
117
|
|
|
'sigId' => $attrId, |
|
118
|
|
|
'sigRule' => $sigContent, |
|
119
|
|
|
'sever' => $attrSever, |
|
120
|
|
|
'title' => $attrTitle |
|
121
|
|
|
]; |
|
122
|
|
|
} |
|
123
|
|
|
|
|
124
|
|
|
break; |
|
125
|
|
|
case 'const': |
|
126
|
|
|
if ((($pos = strpos($content, $sigContent)) !== false) || |
|
127
|
|
|
(($pos = strpos($normalized, $sigContent)) !== false) |
|
128
|
|
|
) { |
|
129
|
|
|
$this->infected[$path][] = [ |
|
130
|
|
|
'pos' => (int)$pos, |
|
131
|
|
|
'sigId' => $attrId, |
|
132
|
|
|
'sigRule' => $sigContent, |
|
133
|
|
|
'sever' => $attrSever, |
|
134
|
|
|
'title' => $attrTitle |
|
135
|
|
|
]; |
|
136
|
|
|
$detected = true; |
|
137
|
|
|
} |
|
138
|
|
|
|
|
139
|
|
|
break; |
|
140
|
|
|
} |
|
141
|
|
|
} |
|
142
|
|
|
return $detected; |
|
143
|
|
|
} |
|
144
|
|
|
|
|
145
|
|
|
/** |
|
146
|
|
|
* Prepare scan list on first run. Scan directory's and save as JSON |
|
147
|
|
|
*/ |
|
148
|
|
|
private function prepareScanlist() |
|
149
|
|
|
{ |
|
150
|
|
|
$files = (object)File::listFiles(root, $this->affectedExt); |
|
151
|
|
|
File::write('/Private/Antivirus/ScanFiles.json', json_encode($files)); |
|
152
|
|
|
} |
|
153
|
|
|
|
|
154
|
|
|
/** |
|
155
|
|
|
* Prepare content, replacing any encoding of it, based on Hex, OctDec or other offset's |
|
156
|
|
|
* @param string $content |
|
157
|
|
|
* @return mixed |
|
158
|
|
|
*/ |
|
159
|
|
|
private function normalizeContent($content) |
|
160
|
|
|
{ |
|
161
|
|
|
$content = @preg_replace_callback('/\\\\x([a-fA-F0-9]{1,2})/i', 'escapedHexToHex', $content); // strip hex ascii notation |
|
162
|
|
|
$content = @preg_replace_callback('/\\\\([0-9]{1,3})/i', 'escapedOctDec', $content); // strip dec ascii notation |
|
163
|
|
|
$content = preg_replace('/[\'"]\s*?\.\s*?[\'"]/smi', '', $content); // concat fragmented strings |
|
164
|
|
|
$content = preg_replace('|/\*.*?\*/|smi', '', $content); // remove comments to detect fragmented pieces of malware |
|
165
|
|
|
|
|
166
|
|
|
return $content; |
|
167
|
|
|
} |
|
168
|
|
|
} |
|
169
|
|
|
|
phpffcms /
ffcms
Loading history...