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SigTool.php
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SigTool.php
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<?php
/**
* SigTool v2.0.0 (last modified: 2022.02.12).
* @link https://github.com/phpMussel/SigTool
*
* Generates signatures for phpMussel using main.cvd and daily.cvd from ClamAV.
*
* @author Caleb M (Maikuolan) <https://github.com/Maikuolan>.
*/
namespace phpMussel\SigTool;
require __DIR__ . '/YAML.php';
require __DIR__ . '/Cvd.php';
class SigTool extends \Maikuolan\Common\YAML
{
/**
* @var string Script version.
* @link https://github.com/phpMussel/SigTool/tags
*/
public const VERSION = '2.0.0';
/**
* @var string Last modified date.
*/
public const MODIFIED = '2021.07.22';
/**
* @var int Safe file chunk size for when reading files.
*/
public const SAFE_READ_SIZE = 131072;
/**
* @var string SigTool YAML data pre-processed raw data.
*/
private $Raw = '';
/**
* @var string Most recent line sent to output.
*/
private $RecentLine = '';
/**
* Parse locally.
*
* @return bool
*/
public function readIn(): bool
{
$Arr = &$this->Data;
$Raw = $this->Raw;
return $this->process($Raw, $Arr);
}
/**
* Set raw data.
*
* @param string $Raw The raw data.
* @return void
*/
public function setRaw(string $Raw)
{
if (substr($Raw, 0, 4) === "---\n") {
$Raw = substr($Raw, 4);
}
$this->Raw = $Raw;
}
/**
* Apply shorthand to signature names and remove any unwanted lines.
*
* @param string $Data The verbatim signature name or identifier.
* @return void
*/
public function shorthand(string &$Data)
{
while (true) {
$Check = hash('sha256', $Data) . ':' . strlen($Data);
foreach ([
["\x11", 'Win'],
["\x12", 'W(?:in)?32'],
["\x13", 'W(?:in)?64'],
["\x14", '(?:ELF|Linux)'],
["\x15", '(?:Macho|OSX)'],
["\x16", 'Andr(?:oid)?'],
["\x17", '(?:E?mail|EML)'],
["\x18", '(?:Javascript|JS|Jscript)'],
["\x19", 'Java'],
["\x1A", 'XXE'],
["\x1B", '(?:Graphics|JPE?G|GIF|PNG)'],
["\x1C", '(?:Macro|OLE)'],
["\x1D", 'HTML?'],
["\x1E", 'RTF'],
["\x1F", '(?:Archive|[RT]AR|ZIP)'],
["\x20", 'PHP'],
["\x21", 'XML'],
["\x22", 'ASPX?'],
["\x23", 'VB[SEX]?'],
["\x24", 'BAT'],
["\x25", 'PDF'],
["\x26", 'SWF'],
["\x27", 'W97M?'],
["\x28", 'X97M?'],
["\x29", 'O97M?'],
["\x2A", 'ASCII'],
["\x2B", 'Unix'],
["\x2C", 'Py(?:thon)?'],
["\x2D", 'Perl'],
["\x2E", 'Ruby'],
["\x2F", '(?:CFG|IN[IF])'],
["\x30", 'CGI'],
] as $Param) {
$Data = preg_replace([
"~\x10\x10" . $Param[1] . '[-.]~i',
"~\x10\x10([a-z0-9]+[._-])" . $Param[1] . '[-.]~i'
], [
$Param[0] . "\x10",
$Param[0] . "\x10\\1"
], $Data);
}
foreach ([
["\x11", 'Worm'],
["\x12", 'Tro?[jy]a?n?'],
["\x13", 'Ad(?:ware)?'],
["\x14", 'Flooder'],
["\x15", 'IRC(?:Bot)?'],
["\x16", 'Exp?l?o?i?t?'],
["\x17", 'VirTool'],
["\x18", 'Dial(?:er)?'],
["\x19", '(?:Joke|Hoax)'],
["\x1B", 'Malware'],
["\x1C", 'Risk(?:ware|y)?'],
["\x1D", '(?:Rkit|Rootkit|Root)'],
["\x1E", '(?:Backdoor|Back|BD|Door)'],
["\x1F", '(?:Hack|Hacktool|HT)'],
["\x20", '(?:Key)?logger'],
["\x21", 'Ransom(?:ware)?'],
["\x22", 'Spy(?:ware)?'],
["\x23", 'Vir(?:us)?'],
["\x24", 'Dropper'],
["\x25", 'Dropped'],
["\x26", '(?:Dldr|Downloader)'],
["\x27", 'Obfuscation'],
["\x28", 'Obfuscator'],
["\x29", 'Obfuscated'],
["\x2A", 'Packer'],
["\x2B", 'Packed'],
["\x2C", 'PU[AP]'],
["\x2D", 'Shell'],
["\x2E", 'Defacer'],
["\x2F", 'Defacement'],
["\x30", 'Crypt(?:ed|or)?'],
["\x31", 'Phish'],
["\x32", 'Spam'],
["\x33", 'Spammer'],
["\x34", 'Scam'],
["\x35", 'ZipBomb'],
["\x36", 'Fork(?:Bomb)?'],
["\x37", 'LogicBomb'],
["\x38", 'CyberBomb'],
["\x39", 'Malvertisement'],
["\x3D", 'Encrypted'],
["\x3F", 'BadURL'],
] as $Param) {
$Data = preg_replace([
"~\x10" . $Param[1] . '[-.]~i',
"~\x10([a-z0-9]+[._-])" . $Param[1] . '[-.]~i'
], [
$Param[0],
$Param[0] . '\1'
], $Data);
}
$Data = preg_replace([
/** Let's reduce our footprint. :-) */
'~([^a-z0-9])(?:Agent|General|Generic)([.-])~i',
/** CVDs use both; Let's normalise it. */
'~([^a-z0-9])Downloader([.-])~i',
/** ClamAV signature format documentation is unclear about what "[]" means. */
'~^[^\:\n]+\:[^\n]+[\[\]][^\n]*$~m',
/** PCRE trips over capture groups at this range sometimes. Let's play it safe and ditch the affected signatures. */
'~^.*\{(?:-?\d{4,}|\d{4,}-)\}.*$\n~m',
/** Not needed in the final generated signature files. */
'~^.*This ClamAV version has reached End of Life.*$\n~im'
], [
'\1X\2',
'\1Dldr\2',
'',
'',
''
], $Data);
if (hash('sha256', $Data) . ':' . strlen($Data) === $Check) {
break;
}
}
}
/**
* Fix path (we get funky results for "__DIR__ . '/'" in some cases, on some systems).
*
* @param string $Path
* @return string
*/
public function fixPath(string $Path): string
{
return str_replace(['\/', '\\', '/\\'], '/', $Path);
}
/**
* Output message.
*
* @param string $Message The message to output.
* @param bool $NewLine Whether to print to a new line.
* @return void
*/
public function outputMessage(string $Message = '', bool $NewLine = false)
{
if ($Message) {
$this->RecentLine = wordwrap($Message, 64, "\n ");
}
if ($NewLine) {
echo "\n" . $this->RecentLine . ' <RAM ' . $this->formatSize(memory_get_usage()) . '>';
return;
}
echo "\r" . str_repeat(' ', 76) . "\r" . $this->RecentLine . ' <RAM ' . $this->formatSize(memory_get_usage()) . '>';
}
/**
* Format size.
*
* @param int $Size
* @return string Formatted size.
*/
private function formatSize(int $Size): string
{
$Scale = ['bytes', 'KB', 'MB', 'GB', 'TB'];
$Iterate = 0;
while ($Size > 1024) {
$Size /= 1024;
$Iterate++;
if ($Iterate > 3) {
break;
}
}
return number_format($Size, $Iterate === 0 ? 0 : 2) . ' ' . $Scale[$Iterate];
}
}
/** Fetch arguments. */
$RunMode = !empty($argv[1]) ? strtolower($argv[1]) : '';
/** Instantiate the SigTool object. */
$SigTool = new SigTool();
/** L10N. */
$L10N = [
'Help' => sprintf(
" SigTool v%s (last modified: %s).\n\n%s",
SigTool::VERSION,
SigTool::MODIFIED,
" Generates signatures for phpMussel using main.cvd and daily.cvd from ClamAV.\n\n" .
" Syntax:\n \$ php SigTool.php [arguments]\n\n Example:\n php SigTool.php xp\n\n" .
" Arguments (all are OFF by default; include to turn ON):\n" .
" - No arguments: Display this help information.\n" .
" - x: Extract signature files from \"daily.cvd\" and \"main.cvd\".\n" .
" - p: Process signature files for use with phpMussel.\n\n"
),
'Accessing' => ' Accessing %s ...',
'Decompressing' => ' Decompressing %s ...',
'Deleting' => ' Deleting %s ...',
'Done' => " Done!",
'Extracting_to_Cvd' => ' Extracting contents from %s to Cvd object ...',
'Failed' => " Failed!",
'Processing' => ' Processing ...',
'Writing' => ' Writing %s ...',
'_Error_Corrupted' => ' Reading "%2$s" failed at line "%1$d"! "%2$s" could be corrupted! SigTool terminated.',
'_Error_Other' => ' Error at line "%d"! SigTool terminated.',
'_Error_Reading' => ' Reading from "%2$s" failed at line "%1$d"! SigTool terminated.',
'_Error_Writing' => ' Writing to "%2$s" failed at line "%1$d"! SigTool terminated.'
];
/**
* Terminate with debug information.
*/
$Terminate = function ($Err = '_Error_Other', $Msg = '') use (&$SigTool, &$L10N) {
$Debug = debug_backtrace(DEBUG_BACKTRACE_PROVIDE_OBJECT | DEBUG_BACKTRACE_IGNORE_ARGS, 1)[0];
$SigTool->outputMessage(sprintf($L10N[$Err] ?? $L10N['_Error_Other'], $Debug['line'], $Msg), true);
echo "\n\n";
die;
};
/**
* Display help information.
*/
if ($RunMode === '') {
die($L10N['Help']);
}
/**
* We'll use Zürich time for our timezone (closest approximate to CET, and
* required for our "Y.z.B" dates to actually make sense).
*/
date_default_timezone_set('Europe/Zurich');
/**
* Extract ClamAV signature files from "daily.cvd" and "main.cvd" packages.
*/
if (strpos($RunMode, 'x') !== false) {
foreach (['daily.cvd', 'main.cvd'] as $Set) {
$File = $SigTool->fixPath(__DIR__ . '/' . $Set);
/** Terminate if the file is missing or unreadable. */
if (!file_exists($File) || !is_readable($File)) {
$Terminate('_Error_Reading', $Set);
}
$SigTool->outputMessage(sprintf($L10N['Decompressing'], $Set), true);
$Files = new Cvd($File);
$SigTool->outputMessage(sprintf($L10N['Decompressing'], $Set) . $L10N['Done']);
$SigTool->outputMessage(sprintf($L10N['Extracting_to_Cvd'], $Set), true);
if ($Files->ErrorState !== 0) {
$Terminate('_Error_Corrupted', $File);
}
$SigTool->outputMessage(sprintf($L10N['Extracting_to_Cvd'], $Set) . $L10N['Done']);
while (true) {
$Name = $Files->EntryName();
$Data = $Files->EntryRead();
if ($Name !== '' && $Data !== '' && $Files->EntryIsDirectory() === false) {
$SigTool->outputMessage(sprintf($L10N['Writing'], $Name), true);
$Handle = fopen($SigTool->fixPath(__DIR__ . '/' . $Name), 'wb');
if (!is_resource($Handle)) {
$Terminate('_Error_Writing', $Name);
}
fwrite($Handle, $Data);
fclose($Handle);
$SigTool->outputMessage(sprintf($L10N['Writing'], $Name) . $L10N['Done']);
}
if ($Files->EntryNext() === false) {
break;
}
}
}
/** Cleanup. */
unset($Handle, $Data, $Name, $Files, $File, $Set);
}
/**
* Process signature files for use with phpMussel.
*/
if (strpos($RunMode, 'p') !== false) {
/** Check if signatures.dat exists; If so, we'll read it for updating. */
if (is_readable(($DatFile = $SigTool->fixPath(__DIR__ . '/signatures.dat')))) {
$SigTool->outputMessage(sprintf($L10N['Accessing'], 'signatures.dat'), true);
$Handle = fopen($DatFile, 'rb');
$SigTool->setRaw(fread($Handle, filesize($DatFile)));
fclose($Handle);
$SigTool->readIn();
$Meta = &$SigTool->Data;
$SigTool->outputMessage(sprintf($L10N['Accessing'], 'signatures.dat') . $L10N['Done']);
}
/** Don't need these (not currently used by this tool or by phpMussel). */
foreach ([
'COPYING',
'daily.cdb',
'daily.cfg',
'daily.crb',
'daily.fp',
'daily.ftm',
'daily.hdu',
'daily.hsb',
'daily.hsu',
'daily.idb',
'daily.ign',
'daily.ign2',
'daily.info',
'daily.ldb',
'daily.ldu',
'daily.mdu',
'daily.msb',
'daily.msu',
'daily.ndu',
'daily.pdb',
'daily.sfp',
'daily.wdb',
'main.cdb',
'main.crb',
'main.fp',
'main.hdu',
'main.hsb',
'main.info',
'main.ldb',
'main.msb',
'main.sfp',
] as $File) {
if (file_exists($SigTool->fixPath(__DIR__ . '/' . $File))) {
$SigTool->outputMessage(sprintf($L10N['Deleting'], $File), true);
$SigTool->outputMessage(sprintf($L10N['Deleting'], $File) . (unlink($SigTool->fixPath(__DIR__ . '/' . $File)) ? $L10N['Done'] : $L10N['Failed']));
}
}
/** Main sequence. */
foreach ([
['daily.hdb', 'main.hdb', '~([\da-f]{32}\:\d+\:)([^\n]+)\n~', "\\1\x1A\x20\x10\x10\\2\n", 'clamav.hdb', "\x20", 16777216],
['daily.mdb', 'main.mdb', '~(\d+\:[\da-f]{32}\:)([^\n]+)\n~', "\\1\x1A\x20\x10\x10\\2\n", 'clamav.mdb', "\xA0", 16777216],
['daily.ndb', 'main.ndb', '~^([^:\n]+\:)~m', "\x1A\x20\x10\x10\\1", 'clamav.ndb', false, 0],
] as $Set) {
/** Fetch and build. */
if (file_exists($SigTool->fixPath(__DIR__ . '/' . $Set[0])) && file_exists($SigTool->fixPath(__DIR__ . '/' . $Set[1]))) {
$UseMains = false;
$FileData = '';
$Size = 0;
$SigTool->outputMessage(sprintf($L10N['Accessing'], $Set[0]), true);
if (!is_resource($Handle = fopen($SigTool->fixPath(__DIR__ . '/' . $Set[0]), 'rb'))) {
$SigTool->outputMessage(sprintf($L10N['Accessing'], $Set[0]) . $L10N['Failed']);
} else {
$Size += filesize($SigTool->fixPath(__DIR__ . '/' . $Set[0]));
if ($Set[6] > 0 && $Size > $Set[6]) {
fseek($Handle, $Size - $Set[6]);
} else {
$UseMains = true;
}
while (!feof($Handle)) {
$FileData .= fread($Handle, SigTool::SAFE_READ_SIZE);
}
fclose($Handle);
$SigTool->outputMessage(sprintf($L10N['Accessing'], $Set[0]) . $L10N['Done']);
}
if ($UseMains) {
$SigTool->outputMessage(sprintf($L10N['Accessing'], $Set[1]), true);
if (!is_resource($Handle = fopen($SigTool->fixPath(__DIR__ . '/' . $Set[1]), 'rb'))) {
$SigTool->outputMessage(sprintf($L10N['Accessing'], $Set[1]) . $L10N['Failed']);
} else {
$Size += filesize($SigTool->fixPath(__DIR__ . '/' . $Set[1]));
if ($Set[6] > 0 && $Size > $Set[6]) {
fseek($Handle, $Size - $Set[6]);
}
$RemSize = $Set[6] ? $Set[6] : $Size;
while (!feof($Handle) && $RemSize > 0) {
$RemSize -= SigTool::SAFE_READ_SIZE;
$FileData = fread($Handle, SigTool::SAFE_READ_SIZE) . $FileData;
}
if ($RemSize < 1 && substr($FileData, -1, 1) !== "\n" && ($EoF = strrpos($FileData, "\n")) !== false) {
$FileData = substr($FileData, 0, $EoF) . "\n";
}
fclose($Handle);
$SigTool->outputMessage(sprintf($L10N['Accessing'], $Set[1]) . $L10N['Done']);
}
} elseif (($EoL = strpos($FileData, "\n")) !== false) {
$FileData = substr($FileData, $EoL + 1);
}
$SigTool->outputMessage(sprintf($L10N['Writing'], $Set[4]), true);
if ($Set[5]) {
$FileData = 'phpMussel' . $Set[5] . "\n" . $FileData;
}
$FileData = preg_replace($Set[2], $Set[3], $FileData);
/** Apply shorthand to signature names and remove any unwanted lines. */
$SigTool->shorthand($FileData);
/** Remove erroneous lines. */
$FileData = preg_replace('~^(?!phpMussel|\n)[^\x1A\n]+$\n~im', '', $FileData);
/** Write to file. */
if (!is_resource($Handle = fopen($SigTool->fixPath(__DIR__ . '/' . $Set[4]), 'wb'))) {
$Terminate('_Error_Writing', $Set[4] . '.gz');
}
fwrite($Handle, $FileData);
fclose($Handle);
if ($Set[5]) {
if (!is_resource($Handle = gzopen($SigTool->fixPath(__DIR__ . '/' . $Set[4] . '.gz'), 'wb'))) {
$Terminate('_Error_Writing', $Set[4] . '.gz');
}
gzwrite($Handle, $FileData);
gzclose($Handle);
}
/** YAML metadata stuff here. */
if (!empty($Set[5]) && !empty($Set[4]) && !empty($Meta[$Set[4]]['Files']['Checksum'][0]) && !empty($Meta[$Set[4]]['Version'])) {
/** We use the format Y.z.B for signature file versioning. */
$Meta[$Set[4]]['Version'] = date('Y.z.B', time());
$Meta[$Set[4]]['Files']['Checksum'][0] = hash('sha256', $FileData) . ':' . strlen($FileData);
}
$SigTool->outputMessage(sprintf($L10N['Writing'], $Set[4]) . $L10N['Done']);
$FileData = '';
}
/** Don't need these anymore. */
foreach ([$Set[0], $Set[1]] as $File) {
if (file_exists($SigTool->fixPath(__DIR__ . '/' . $File))) {
$SigTool->outputMessage(sprintf($L10N['Deleting'], $File), true);
$SigTool->outputMessage(sprintf($L10N['Deleting'], $File) . (unlink($SigTool->fixPath(__DIR__ . '/' . $File)) ? $L10N['Done'] : $L10N['Failed']));
}
}
}
/** NDB sequence. */
if (is_readable($SigTool->fixPath(__DIR__ . '/clamav.ndb'))) {
$SigTool->outputMessage(sprintf($L10N['Accessing'], 'clamav.ndb'), true);
$FileData = '';
if (!is_resource($Handle = fopen($SigTool->fixPath(__DIR__ . '/clamav.ndb'), 'rb'))) {
$SigTool->outputMessage(sprintf($L10N['Accessing'], 'clamav.ndb') . $L10N['Failed']);
} else {
while (!feof($Handle)) {
$FileData .= fread($Handle, SigTool::SAFE_READ_SIZE);
}
fclose($Handle);
$SigTool->outputMessage(sprintf($L10N['Accessing'], 'clamav.ndb') . $L10N['Done']);
}
if (!empty($FileData)) {
$SigTool->outputMessage($L10N['Processing'], true);
/** All the signature files that we're generating from our clamav.ndb file. */
$FileSets = [
'clamav.db' => "phpMussel0\n>!\$fileswitch>pefile>-1\n",
'clamav_regex.db' => "phpMussel@\n>!\$fileswitch>pefile>-1\n",
'clamav.htdb' => "phpMusselp\n>\$is_html>1>-1\n",
'clamav_regex.htdb' => "phpMussel\x80\n>\$is_html>1>-1\n",
'clamav.ndb' => "phpMusselP\n>!\$fileswitch>pefile>-1\n",
'clamav_regex.ndb' => "phpMussel`\n>!\$fileswitch>pefile>-1\n",
'clamav_elf.db' => "phpMussel0\n>\$is_elf>1>-1\n",
'clamav_elf_regex.db' => "phpMussel@\n>\$is_elf>1>-1\n",
'clamav_email.db' => "phpMussel0\n>\$is_email>1>-1\n",
'clamav_email_regex.db' => "phpMussel@\n>\$is_email>1>-1\n",
'clamav_exe.db' => "phpMussel0\n>\$is_pe>1>-1\n",
'clamav_exe_regex.db' => "phpMussel@\n>\$is_pe>1>-1\n",
'clamav_graphics.db' => "phpMussel0\n>\$is_graphics>1>-1\n",
'clamav_graphics_regex.db' => "phpMussel@\n>\$is_graphics>1>-1\n",
'clamav_java.db' => "phpMussel0\n>!\$fileswitch>pefile>-1\n",
'clamav_java_regex.db' => "phpMussel@\n>!\$fileswitch>pefile>-1\n",
'clamav_macho.db' => "phpMussel0\n>\$is_macho>1>-1\n",
'clamav_macho_regex.db' => "phpMussel@\n>\$is_macho>1>-1\n",
'clamav_ole.db' => "phpMussel0\n>\$is_ole>1>-1\n",
'clamav_ole_regex.db' => "phpMussel@\n>\$is_ole>1>-1\n",
'clamav_pdf.db' => "phpMussel0\n>\$is_pdf>1>-1\n",
'clamav_pdf_regex.db' => "phpMussel@\n>\$is_pdf>1>-1\n",
'clamav_swf.db' => "phpMussel0\n>\$is_swf>1>-1\n",
'clamav_swf_regex.db' => "phpMussel@\n>\$is_swf>1>-1\n",
];
$Offset = 0;
$SigsNDB = substr_count($FileData, "\n");
$SigsThis = 0;
$Percent = '';
/** Signature type to standard signature file pointer correlations. */
$CorrelationsStandard = [
'clamav.db',
'clamav_exe.db',
'clamav_ole.db',
'clamav.htdb',
'clamav_email.db',
'clamav_graphics.db',
'clamav_elf.db',
'clamav.ndb',
'clamav_macho.db',
'clamav_pdf.db',
'clamav_swf.db',
'clamav_java.db'
];
/** Signature type to regex signature file pointer correlations. */
$CorrelationsRegex = [
'clamav_regex.db',
'clamav_exe_regex.db',
'clamav_ole_regex.db',
'clamav_regex.htdb',
'clamav_email_regex.db',
'clamav_graphics_regex.db',
'clamav_elf_regex.db',
'clamav_regex.ndb',
'clamav_macho_regex.db',
'clamav_pdf_regex.db',
'clamav_swf_regex.db',
'clamav_java_regex.db'
];
/** Target guess to signature type correlations. */
$CorrelationsTargetGuess = [
"\x11" => 1,
"\x12" => 1,
"\x13" => 1,
"\x14" => 6,
"\x15" => 9,
"\x17" => 4,
"\x19" => 12,
"\x1B" => 5,
"\x1C" => 2,
"\x1D" => 3,
"\x25" => 10,
"\x26" => 11
];
/** Begin working through individual signatures. */
while (($Pos = strpos($FileData, "\n", $Offset)) !== false) {
$Last = $Percent;
$Percent = number_format(($SigsThis / $SigsNDB) * 100, 2) . '%';
$SigsThis++;
if ($Percent !== $Last) {
$SigTool->outputMessage($L10N['Processing'] . ' ' . $Percent);
}
/** The current line in the signature file. */
$ThisLine = substr($FileData, $Offset, $Pos - $Offset);
$Offset = $Pos + 1;
/** Helps to prevent invalid signatures sneaking in. */
if (strpos($ThisLine, ':') === false) {
continue;
}
/** Helps to prevent "Compilation failed: number too big in {} quantifier ..." errors. */
if (preg_match('/\{(?:\d{6,}|6[6-9]\d{3,}|65[6-9]\d{2,}|655[4-9]\d+|6553[6-9])/', $ThisLine)) {
continue;
}
$ThisLine = explode(':', $ThisLine);
$SigName = $ThisLine[0] ?? '';
$SigType = empty($ThisLine[1]) ? 0 : (int)$ThisLine[1];
$SigOffset = $ThisLine[2] ?? '';
$SigHex = $ThisLine[3] ?? '';
$StartStop = '';
/** Sort offsets. */
if (!empty($SigOffset) && $SigOffset !== '*') {
$Start = $SigOffset;
/**
* Signatures with entry point offsets disregarded for now,
* because phpMussel hasn't been coded to handle them yet
* anyway (we'll get around to sorting it out eventually).
*/
if (substr($SigOffset, 0, 2) === 'EP') {
continue;
}
if (substr($SigOffset, 0, 4) === 'EOF-') {
$StartStop = ':' . (int)substr($SigOffset, 3);
} elseif (substr($SigOffset, 0, 1) === 'S') {
$StartStop = ':'. $SigOffset;
} else {
/** Ignoring float shifts because we're not using them. */
if (($Comma = strpos($SigOffset, ',')) !== false) {
$Start = substr($SigOffset, 0, $Comma);
}
if ($Start !== '*') {
$Start = (int)$Start;
if ($Start === 0) {
$Start = 'A';
}
$StartStop = ':' . $Start;
}
}
}
/** Try to avoid dumping into general signatures whenever possible. */
if ($SigType === 0) {
$TargetGuess = substr($SigName, 2, 1);
if (!empty($CorrelationsTargetGuess[$TargetGuess])) {
$SigType = $CorrelationsTargetGuess[$TargetGuess];
}
}
/** Normalise to lower-case. */
$SigHex = strtolower($SigHex);
if (preg_match('/[^a-f\d*]/i', $SigHex)) {
/** Convert from ClamAV's pattern syntax to PCRE syntax. */
$SigHex = preg_replace([
'~^.*\{(?:-?\d{4,}|\d{4,}-)\}.*$~',
'~\{(\d+)-(?:\d{4,})?\}~',
'~\{(\d+)-(\d+)\}~',
'~\{-(\d+)\}~',
'~\{(\d+)\}~',
], [
'',
'(?:..){\1,}',
'(?:..){\1,\2}',
'(?:..){0,\1}',
'(?:..){\1}',
], str_replace([
'*',
'?',
'{1}',
'{0-1}',
'{0-}',
'{1-}',
'(22|27)',
'(27|22)',
], [
'.*',
'.',
'.',
'.?',
'.*',
'.+',
'2[27]',
'2[27]',
], $SigHex));
/** Possible character range. */
$CharRange = ['0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f'];
/** Simplify all the (xx|xx|xx|xx...) stuff into something smaller and more readable. */
foreach ($CharRange as $Char) {
$InnerCharRange = $CharRange;
while (true) {
$Replacer = '(';
foreach ($InnerCharRange as $InnerChar) {
$Replacer .= $Char . $InnerChar . '|';
}
$Replacer = substr($Replacer, 0, -1) . ')';
$FinalLast = array_pop($InnerCharRange) ?: '';
$InnerCharCount = count($InnerCharRange);
if (!$InnerCharCount) {
break;
}
if ($InnerCharCount === 9) {
$Replacement = $Char . '\d';
} elseif ($InnerCharCount < 9) {
$Replacement = $Char . '[0-' . $FinalLast . ']';
} else {
$Replacement = $InnerCharCount === 10 ? $Char . '[\da]' : $Char . '[\da-' . $FinalLast . ']';
}
$SigHex = str_ireplace($Replacer, $Replacement, $SigHex);
}
}
/** Upper-lower case stuff, and further simplification. */
foreach ($CharRange as $Char) {
$SigHex = str_ireplace([
'(4' . $Char . '|6' . $Char . ')',
'(6' . $Char . '|4' . $Char . ')',
'(5' . $Char . '|7' . $Char . ')',
'(7' . $Char . '|5' . $Char . ')',
'(?:..){4}',
'(?:..){3}',
'(?:..){2}',
'(?:..){1}'
], [
'[46]' . $Char,
'[46]' . $Char,
'[57]' . $Char,
'[57]' . $Char,
'.{8}',
'.{6}',
'....',
'..'
], $SigHex);
}
/** Reduce footprint. */
foreach ($CharRange as $Char) {
$Matches = [];
$Lengths = [];
if (preg_match_all('~' . $Char . '{16,}~', $SigHex, $Matches) !== false && isset($Matches[0])) {
foreach ($Matches[0] as $Match) {
$Lengths[] = strlen($Match);
}
rsort($Lengths);
}
foreach ($Lengths as $Length) {
$SigHex = preg_replace_callback(
'~(?P<_before>[^' . $Char . '])' . $Char . '{' . $Length . '}(?P<_after>[^' . $Char . '])~',
function ($Matches) use ($Char, $Length) {
return $Matches['_before'] . $Char . '{' . $Length . '}' . $Matches['_after'];
},
$SigHex
);
}
}
/** Newly formatted signature line. */
$ThisLine = $SigName . ':' . $SigHex . $StartStop . "\n";
/** Add to file based on signature type (regex). */
if (!empty($CorrelationsRegex[$SigType])) {
$FileSets[$CorrelationsRegex[$SigType]] .= $ThisLine;
}
} else {
/** Wildcards and other tricks. */
$SigHex = str_replace('*', '>', $SigHex);
/** Newly formatted signature line. */
$ThisLine = $SigName . ':' . $SigHex . $StartStop . "\n";
/** Add to file based on signature type (non-regex). */
if (!empty($CorrelationsStandard[$SigType])) {
$FileSets[$CorrelationsStandard[$SigType]] .= $ThisLine;
}
}
}
$SigTool->outputMessage($L10N['Processing'] . $L10N['Done']);
foreach ($FileSets as $FileSet => $FileData) {
$SigTool->outputMessage(sprintf($L10N['Writing'], $FileSet), true);
if (!empty($Meta[$FileSet]['Files']['Checksum'][0]) && !empty($Meta[$FileSet]['Version'])) {
/** We use the format Y.z.B for signature file versioning. */
$Meta[$FileSet]['Version'] = date('Y.z.B', time());
$Meta[$FileSet]['Files']['Checksum'][0] = hash('sha256', $FileData) . ':' . strlen($FileData);
}
file_put_contents($SigTool->fixPath(__DIR__ . '/' . $FileSet), $FileData);
$Handle = gzopen($SigTool->fixPath(__DIR__ . '/' . $FileSet . '.gz'), 'wb');
gzwrite($Handle, $FileData);
gzclose($Handle);
$SigTool->outputMessage(sprintf($L10N['Writing'], $FileSet) . $L10N['Done']);
}
}
}
/** Update signatures.dat if necessary. */
if (!empty($Meta)) {
$SigTool->outputMessage(sprintf($L10N['Writing'], 'signatures.dat'), true);
$NewMeta = "---\n" . $SigTool->reconstruct($SigTool->Data);
$Handle = fopen($DatFile, 'wb');
fwrite($Handle, $NewMeta);
fclose($Handle);
$SigTool->outputMessage(sprintf($L10N['Writing'], 'signatures.dat') . $L10N['Done']);
}
}
echo "\n";