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Refactor generating of private key

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Generating of private key is atomic now.
This commit is contained in:
Peter Knut
2024-10-07 23:37:33 +02:00
committed by Jakub Vrana
parent 43e3fe375d
commit 28535bf384
1 changed files with 18 additions and 8 deletions
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26
adminer/include/functions.inc.php
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@@ -819,6 +819,13 @@ function file_write_unlock($fp, $data) {
rewind($fp);
fwrite($fp, $data);
ftruncate($fp, strlen($data));
file_unlock($fp);
}
/** Unlock and close a file
* @param resource
*/
function file_unlock($fp) {
flock($fp, LOCK_UN);
fclose($fp);
}
@@ -829,16 +836,19 @@ function file_write_unlock($fp, $data) {
*/
function password_file($create) {
$filename = get_temp_dir() . "/adminer.key";
$return = @file_get_contents($filename); // @ - may not exist
if ($return || !$create) {
return $return;
if (!$create && !file_exists($filename)) {
return false;
}
$fp = @fopen($filename, "w"); // @ - can have insufficient rights //! is not atomic
if ($fp) {
chmod($filename, 0660);
$fp = file_open_lock($filename);
if (!$fp) {
return false;
}
$return = stream_get_contents($fp);
if (!$return) {
$return = rand_string();
fwrite($fp, $return);
fclose($fp);
file_write_unlock($fp, $return);
} else {
file_unlock($fp);
}
return $return;
}