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><H1
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><A
NAME="AUTH-DELAY"
>F.2. auth_delay</A
></H1
><P
> <TT
CLASS="FILENAME"
>auth_delay</TT
> causes the server to pause briefly before
reporting authentication failure, to make brute-force attacks on database
passwords more difficult. Note that it does nothing to prevent
denial-of-service attacks, and may even exacerbate them, since processes
that are waiting before reporting authentication failure will still consume
connection slots.
</P
><P
> In order to function, this module must be loaded via
<A
HREF="runtime-config-resource.html#GUC-SHARED-PRELOAD-LIBRARIES"
>shared_preload_libraries</A
> in <TT
CLASS="FILENAME"
>postgresql.conf</TT
>.
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><A
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>F.2.1. Configuration Parameters</A
></H2
><P
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><DIV
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><DL
><DT
><TT
CLASS="VARNAME"
>auth_delay.milliseconds</TT
> (<TT
CLASS="TYPE"
>int</TT
>)</DT
><DD
><P
> The number of milliseconds to wait before reporting an authentication
failure. The default is 0.
</P
></DD
></DL
></DIV
><P
> These parameters must be set in <TT
CLASS="FILENAME"
>postgresql.conf</TT
>.
Typical usage might be:
</P
><PRE
CLASS="PROGRAMLISTING"
># postgresql.conf
shared_preload_libraries = 'auth_delay'
auth_delay.milliseconds = '500'</PRE
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><A
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>F.2.2. Author</A
></H2
><P
> KaiGai Kohei <CODE
CLASS="EMAIL"
><<A
HREF="mailto:kaigai@ak.jp.nec.com"
>kaigai@ak.jp.nec.com</A
>></CODE
>
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