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New contrib module, auth_delay.

Browse Source 
KaiGai Kohei, with a few changes by me.
This commit is contained in:
Robert Haas
2010-11-27 07:22:25 -05:00
parent d53c1255d9
commit fe7a32fc87
7 changed files with 159 additions and 0 deletions
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14
contrib/auth_delay/Makefile Normal file
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# contrib/auth_delay/Makefile
MODULES = auth_delay
ifdef USE_PGXS
PG_CONFIG = pg_config
PGXS := $(shell $(PG_CONFIG) --pgxs)
include $(PGXS)
else
subdir = contrib/auth_delay
top_builddir = ../..
include $(top_builddir)/src/Makefile.global
include $(top_srcdir)/contrib/contrib-global.mk
endif

70
contrib/auth_delay/auth_delay.c Normal file
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/* -------------------------------------------------------------------------
*
* auth_delay.c
*
* Copyright (C) 2010, PostgreSQL Global Development Group
*
* IDENTIFICATION
* contrib/auth_delay/auth_delay.c
*
* -------------------------------------------------------------------------
*/
#include "postgres.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 custome GUC variables */
DefineCustomIntVariable("auth_delay.milliseconds",
"Milliseconds to delay before reporting authentication failure",
NULL,
&auth_delay_milliseconds,
0,
0, INT_MAX,
PGC_SIGHUP,
GUC_UNIT_MS,
NULL,
NULL);
/* Install Hooks */
original_client_auth_hook = ClientAuthentication_hook;
ClientAuthentication_hook = auth_delay_checks;
}