Security: fix 8 code-review findings

- install.sh: replace /usr/sbin/ufw * with scoped subcommands
- install.sh: remove /usr/bin/curl * and /usr/bin/env * NOPASSWD (trivial root escalation)
- PHPManager: switchVersion() uses sudo rm -f instead of unlink() for old pool
- PHPManager: updateConfig() SQLite syntax (ON CONFLICT / datetime('now'))
- WordPressManager: cloneStaging() escapeshellarg() on all shell-interpolated paths
- WordPressManager: delete() removes DB record before filesystem to avoid phantom records
- WordPressManager: ensureWpCli() validates download size and enforces 30s timeout

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

panel/lib/PHPManager.php

@@ -65,7 +65,8 @@ php_value[max_execution_time]  = 30
 
         // Remove old pool, create new one
         $oldPool = str_replace('{ver}', $oldVer, self::$poolDir) . "/{$acct['username']}.conf";
-        if (file_exists($oldPool)) { unlink($oldPool); self::reloadFPM($oldVer); }
+        shell_exec("sudo rm -f " . escapeshellarg($oldPool) . " 2>/dev/null");
+        self::reloadFPM($oldVer);
 
         self::createPool($acct['username'], $newVer);
 
@@ -100,10 +101,12 @@ php_value[max_execution_time]  = 30
         self::reloadFPM($acct['php_version']);
 
         $db->execute(
-            "INSERT INTO php_configs (account_id, php_version, memory_limit, max_execution_time, upload_max_filesize, post_max_size)
-             VALUES (?,?,?,?,?,?)
-             ON DUPLICATE KEY UPDATE memory_limit=VALUES(memory_limit), max_execution_time=VALUES(max_execution_time),
-             upload_max_filesize=VALUES(upload_max_filesize), post_max_size=VALUES(post_max_size), updated_at=NOW()",
+            "INSERT INTO php_configs (account_id, php_version, memory_limit, max_execution_time, upload_max_filesize, post_max_size, updated_at)
+             VALUES (?,?,?,?,?,?,datetime('now'))
+             ON CONFLICT(account_id) DO UPDATE SET php_version=excluded.php_version,
+             memory_limit=excluded.memory_limit, max_execution_time=excluded.max_execution_time,
+             upload_max_filesize=excluded.upload_max_filesize, post_max_size=excluded.post_max_size,
+             updated_at=excluded.updated_at",
             [$accountId, $acct['php_version'], $cfg['memory_limit'] ?? '256M', $cfg['max_execution_time'] ?? 30,
              $cfg['upload_max_filesize'] ?? '64M', $cfg['post_max_size'] ?? '64M']
         );

panel/lib/WordPressManager.php

@@ -111,7 +111,7 @@ class WordPressManager {
         $stagingRoot   = dirname($docRoot) . rtrim($stagingPath, '/');
 
         // Copy files
-        $this->exec("cp -r {$docRoot} {$stagingRoot}");
+        $this->exec("cp -r " . escapeshellarg($docRoot) . " " . escapeshellarg($stagingRoot));
 
         // Clone DB
         $stagingDb   = $install['db_name'] . '_staging';
@@ -119,7 +119,7 @@ class WordPressManager {
         $this->getProvDb()->exec("CREATE DATABASE IF NOT EXISTS `{$stagingDb}`");
         $this->getProvDb()->exec("CREATE USER IF NOT EXISTS '{$stagingDb}'@'localhost' IDENTIFIED BY '{$stagingDbPw}'");
         $this->getProvDb()->exec("GRANT ALL ON `{$stagingDb}`.* TO '{$stagingDb}'@'localhost'");
-        $this->exec("mysqldump {$install['db_name']} | mysql {$stagingDb}");
+        $this->exec("mysqldump " . escapeshellarg($install['db_name']) . " | mysql " . escapeshellarg($stagingDb));
 
         // Update staging wp-config
         $this->wp($stagingRoot, "config set DB_NAME {$stagingDb}", $sysUser);
@@ -141,10 +141,11 @@ class WordPressManager {
     // ── Delete ────────────────────────────────────────────────────────────────
     public function delete(int $id): bool {
         [$install, $sysUser, $docRoot] = $this->resolve($id);
-        $this->exec("rm -rf {$docRoot}");
+        // Remove DB record first so a failed filesystem cleanup doesn't leave a phantom record
+        $this->db->prepare("DELETE FROM wordpress_installs WHERE id=?")->execute([$id]);
+        $this->exec("rm -rf " . escapeshellarg($docRoot));
         $this->getProvDb()->exec("DROP DATABASE IF EXISTS `{$install['db_name']}`");
         $this->getProvDb()->exec("DROP USER IF EXISTS '{$install['db_user']}'@'localhost'");
-        $this->db->prepare("DELETE FROM wordpress_installs WHERE id=?")->execute([$id]);
         return true;
     }
 
@@ -245,7 +246,12 @@ class WordPressManager {
 
     private function ensureWpCli(): void {
         if (!file_exists($this->wpcli)) {
-            file_put_contents('/tmp/wp-cli.phar', file_get_contents('https://raw.githubusercontent.com/wp-cli/builds/gh-pages/phar/wp-cli.phar'));
+            $ctx  = stream_context_create(['http' => ['timeout' => 30]]);
+            $data = @file_get_contents('https://raw.githubusercontent.com/wp-cli/builds/gh-pages/phar/wp-cli.phar', false, $ctx);
+            if (!$data || strlen($data) < 100000) {
+                throw new \RuntimeException("Failed to download WP-CLI (received " . strlen((string)$data) . " bytes)");
+            }
+            file_put_contents('/tmp/wp-cli.phar', $data);
             rename('/tmp/wp-cli.phar', $this->wpcli);
             chmod($this->wpcli, 0755);
         }