[stable23] Allow writing audit log to syslog and systemdlog

apps/admin_audit/lib/AppInfo/Application.php

@@ -96,15 +96,19 @@ public function boot(IBootContext $context): void {
 	}
 
 	private function getLogger(IConfig $config,
-							   LoggerInterface $logger,
 							   ILogFactory $logFactory): LoggerInterface {
-		$default = $config->getSystemValue('datadirectory', \OC::$SERVERROOT . '/data') . '/audit.log';
-		$logFile = $config->getAppValue('admin_audit', 'logfile', $default);
-
-		if ($logFile === null) {
-			return $logger;
+		$auditType = $config->getSystemValueString('log_type_audit', 'file');
+		$defaultTag = $config->getSystemValueString('syslog_tag', 'Nextcloud');
+		$auditTag = $config->getSystemValueString('syslog_tag_audit', $defaultTag);
+		$logFile = $config->getSystemValueString('logfile_audit', '');
+
+		if ($auditType === 'file' && !$logFile) {
+			$default = $config->getSystemValue('datadirectory', \OC::$SERVERROOT . '/data') . '/audit.log';
+			// Legacy way was appconfig, now it's paralleled with the normal log config
+			$logFile = $config->getAppValue('admin_audit', 'logfile', $default);
 		}
-		return $logFactory->getCustomPsrLogger($logFile);
+
+		return $logFactory->getCustomPsrLogger($logFile, $auditType, $auditTag);
 	}
 
 	/**

config/config.sample.php

@@ -849,6 +849,13 @@
  */
 'log_type' => 'file',
 
+/**
+ * This parameter determines where the audit logs are sent. See ``log_type`` for more information.
+ *
+ * Defaults to ``file``
+ */
+'log_type_audit' => 'file',
+
 /**
  * Name of the file to which the Nextcloud logs are written if parameter
  * ``log_type`` is set to ``file``.
@@ -858,7 +865,15 @@
 'logfile' => '/var/log/nextcloud.log',
 
 /**
- * Log file mode for the Nextcloud loggin type in octal notation.
+ * Name of the file to which the audit logs are written if parameter
+ * ``log_type`` is set to ``file``.
+ *
+ * Defaults to ``[datadirectory]/audit.log``
+ */
+'logfile_audit' => '/var/log/audit.log',
+
+/**
+ * Log file mode for the Nextcloud logging type in octal notation.
  *
  * Defaults to 0640 (writeable by user, readable by group).
  */
@@ -882,6 +897,16 @@
  */
 'syslog_tag' => 'Nextcloud',
 
+/**
+ * If you maintain different instances and aggregate the logs, you may want
+ * to distinguish between them. ``syslog_tag_audit`` can be set per instance
+ * with a unique id. Only available if ``log_type`` is set to ``syslog`` or
+ * ``systemd``.
+ *
+ * The default value is the value of ``syslog_tag``.
+ */
+'syslog_tag_audit' => 'Nextcloud',
+
 /**
  * Log condition for log level increase based on conditions. Once one of these
  * conditions is met, the required log level is set to debug. This allows to

lib/private/Log/Errorlog.php

@@ -29,13 +29,20 @@
 
 class Errorlog implements IWriter {
 
+	/** @var string */
+	protected $tag;
+
+	public function __construct(string $tag = 'owncloud') {
+		$this->tag = $tag;
+	}
+
 	/**
 	 * write a message in the log
 	 * @param string $app
 	 * @param string $message
 	 * @param int $level
 	 */
 	public function write(string $app, $message, int $level) {
-		error_log('[owncloud]['.$app.']['.$level.'] '.$message);
+		error_log('[' . $this->tag . ']['.$app.']['.$level.'] '.$message);
 	}
 }

lib/private/Log/LogFactory.php

@@ -70,8 +70,24 @@ public function getCustomLogger(string $path):ILogger {
 		return new Log($log, $this->systemConfig);
 	}
 
-	public function getCustomPsrLogger(string $path): LoggerInterface {
-		$log = $this->buildLogFile($path);
+	protected function createNewLogger(string $type, string $tag, string $path): IWriter {
+		switch (strtolower($type)) {
+			case 'errorlog':
+				return new Errorlog($tag);
+			case 'syslog':
+				return new Syslog($this->systemConfig, $tag);
+			case 'systemd':
+				return new Systemdlog($this->systemConfig, $tag);
+			case 'file':
+			case 'owncloud':
+			case 'nextcloud':
+			default:
+				return $this->buildLogFile($path);
+		}
+	}
+
+	public function getCustomPsrLogger(string $path, string $type = 'file', string $tag = 'Nextcloud'): LoggerInterface {
+		$log = $this->createNewLogger($type, $tag, $path);
 		return new PsrLoggerAdapter(
 			new Log($log, $this->systemConfig)
 		);

lib/private/Log/Syslog.php

@@ -38,9 +38,12 @@ class Syslog extends LogDetails implements IWriter {
 		ILogger::FATAL => LOG_CRIT,
 	];
 
-	public function __construct(SystemConfig $config) {
+	public function __construct(SystemConfig $config, ?string $tag = null) {
 		parent::__construct($config);
-		openlog($config->getValue('syslog_tag', 'Nextcloud'), LOG_PID | LOG_CONS, LOG_USER);
+		if ($tag === null) {
+			$tag = $config->getValue('syslog_tag', 'Nextcloud');
+		}
+		openlog($tag, LOG_PID | LOG_CONS, LOG_USER);
 	}
 
 	public function __destruct() {

lib/private/Log/Systemdlog.php

@@ -56,14 +56,17 @@ class Systemdlog extends LogDetails implements IWriter {
 
 	protected $syslogId;
 
-	public function __construct(SystemConfig $config) {
+	public function __construct(SystemConfig $config, ?string $tag = null) {
 		parent::__construct($config);
 		if (!function_exists('sd_journal_send')) {
 			throw new HintException(
 				'PHP extension php-systemd is not available.',
 				'Please install and enable PHP extension systemd if you wish to log to the Systemd journal.');
 		}
-		$this->syslogId = $config->getValue('syslog_tag', 'Nextcloud');
+		if ($tag === null) {
+			$tag = $config->getValue('syslog_tag', 'Nextcloud');
+		}
+		$this->syslogId = $tag;
 	}
 
 	/**

lib/public/Log/ILogFactory.php

@@ -51,8 +51,10 @@ public function getCustomLogger(string $path): ILogger;
 
 	/**
 	 * @param string $path
+	 * @param string $type
+	 * @param string $tag
 	 * @return LoggerInterface
-	 * @since 22.0.0
+	 * @since 22.0.0 - Parameters $type and $tag were added in 24.0.0
 	 */
-	public function getCustomPsrLogger(string $path): LoggerInterface;
+	public function getCustomPsrLogger(string $path, string $type = 'file', string $tag = 'Nextcloud'): LoggerInterface;
 }