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-rw-r--r--contrib/auth_delay/auth_delay.c76
1 files changed, 76 insertions, 0 deletions
diff --git a/contrib/auth_delay/auth_delay.c b/contrib/auth_delay/auth_delay.c
new file mode 100644
index 0000000..6b94d65
--- /dev/null
+++ b/contrib/auth_delay/auth_delay.c
@@ -0,0 +1,76 @@
+/* -------------------------------------------------------------------------
+ *
+ * auth_delay.c
+ *
+ * Copyright (c) 2010-2022, PostgreSQL Global Development Group
+ *
+ * IDENTIFICATION
+ * contrib/auth_delay/auth_delay.c
+ *
+ * -------------------------------------------------------------------------
+ */
+#include "postgres.h"
+
+#include <limits.h>
+
+#include "libpq/auth.h"
+#include "port.h"
+#include "utils/guc.h"
+#include "utils/timestamp.h"
+
+PG_MODULE_MAGIC;
+
+void _PG_init(void);
+
+/* GUC Variables */
+static int auth_delay_milliseconds;
+
+/* Original Hook */
+static ClientAuthentication_hook_type original_client_auth_hook = NULL;
+
+/*
+ * Check authentication
+ */
+static void
+auth_delay_checks(Port *port, int status)
+{
+ /*
+ * Any other plugins which use ClientAuthentication_hook.
+ */
+ if (original_client_auth_hook)
+ original_client_auth_hook(port, status);
+
+ /*
+ * Inject a short delay if authentication failed.
+ */
+ if (status != STATUS_OK)
+ {
+ pg_usleep(1000L * auth_delay_milliseconds);
+ }
+}
+
+/*
+ * Module Load Callback
+ */
+void
+_PG_init(void)
+{
+ /* Define custom GUC variables */
+ DefineCustomIntVariable("auth_delay.milliseconds",
+ "Milliseconds to delay before reporting authentication failure",
+ NULL,
+ &auth_delay_milliseconds,
+ 0,
+ 0, INT_MAX / 1000,
+ PGC_SIGHUP,
+ GUC_UNIT_MS,
+ NULL,
+ NULL,
+ NULL);
+
+ MarkGUCPrefixReserved("auth_delay");
+
+ /* Install Hooks */
+ original_client_auth_hook = ClientAuthentication_hook;
+ ClientAuthentication_hook = auth_delay_checks;
+}