Security
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<?
// pwfile.req
class PwFile {
var $fp; // filepointer
var $filename;
function PwFile($filename) // constructor
{
$this->fp = fopen ($filename,"r+");
$this->filename = $filename;
}
function existsUser ($usr_ID)
{
rewind($this->fp); //rewind filepointer
while (feof($this->fp) == 0)
{
$line = chop(fgets($this->fp,1000)); //read line from file
$arr = split(":", $line); //slit at ':'
if ($arr[0] == $usr_ID)
{
return 1; // username found
}
else
{
return 0; // username not found
}
}
}
function getFileSize()
{
return (filesize($this->filename));
}
function write_temp ($contents)
{
echo "<pre>$contents</pre>";
$temp_filename = tempnam ("/tmp", "php_");
echo "<br>$temp_filename<br>";
$temp_fp = fopen($temp_filename, w);
fwrite($temp_fp, $contents);
fclose($temp_fp);
fclose($this->fp);
copy ($temp_filename, $this->filename);
$this->fp = fopen($this->filename, "r+");
//unlink($temp_filename);
}
function addUser ($usr_ID, $usr_passwd)
{
rewind($this->fp);
$contents = fread($this->fp, $this->getFileSize());
echo "<pre>bevor $contents</pre>";
$contents .= "$usr_ID:".crypt($usr_passwd)."n";
echo "<pre>danach $contents</pre>";
$this->write_temp($contents);
}
function deleteUser ($usr_ID)
{
$contents = "";
rewind($this->fp);
while (feof($this->fp) == 0)
{
$line = "";
$line = chop(fgets($this->fp,1000));
$arr = split(":", $line);
if ($arr[0] != $usr_ID)
{
echo $arr[0] ." ist nicht gleich ". $usr_ID;
$contents .= $line . "n";
}
}
echo "<hr>$contents<hr>";
$contents = chop ($contents);
$contents .= "n"; // kind a tricky
$this->write_temp($contents);
}
function updateUser ($usr_ID, $usr_passwd)
{
$this->deleteUser($usr_ID);
$this->addUser($usr_ID,$usr_passwd);
}
}
?>
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Usage Example
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<?
echo "Testfile f�r passwd-file Manipulation";
require("pwfile.req");
$pw = new PwFile("/var/cgi-data/passwd");
$usr_ID = "martind";
$usr_passwd = "sdfasdf";
//$pw->addUser($usr_ID, $usr_passwd);
//$pw->deleteUser($usr_ID);
$pw->updateUser($usr_ID, $usr_passwd);
?>
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