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<!-- doc/src/sgml/auth-delay.sgml --> | ||
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<sect1 id="auth-delay"> | ||
<title>auth_delay</title> | ||
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<indexterm zone="auth-delay"> | ||
<primary>auth_delay</primary> | ||
</indexterm> | ||
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<para> | ||
<filename>auth_delay</filename> 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. | ||
</para> | ||
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<para> | ||
In order to function, this module must be loaded via | ||
<xref linkend="guc-shared-preload-libraries"> in <filename>postgresql.conf</>. | ||
</para> | ||
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<sect2> | ||
<title>Configuration Parameters</title> | ||
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<variablelist> | ||
<varlistentry> | ||
<term> | ||
<varname>auth_delay.milliseconds</varname> (<type>int</type>) | ||
</term> | ||
<indexterm> | ||
<primary><varname>auth_delay.milliseconds</> configuration parameter</primary> | ||
</indexterm> | ||
<listitem> | ||
<para> | ||
The number of milliseconds to wait before reporting an authentication | ||
failure. The default is 0. | ||
</para> | ||
</listitem> | ||
</varlistentry> | ||
</variablelist> | ||
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<para> | ||
In order to set these parameters in your <filename>postgresql.conf</> file, | ||
you will need to add <literal>auth_delay</> to | ||
<xref linkend="guc-custom-variable-classes">. Typical usage might be: | ||
</para> | ||
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<programlisting> | ||
# postgresql.conf | ||
shared_preload_libraries = 'auth_delay' | ||
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custom_variable_classes = 'auth_delay' | ||
auth_delay.milliseconds = '500' | ||
</programlisting> | ||
</sect2> | ||
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<sect2> | ||
<title>Author</title> | ||
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<para> | ||
KaiGai Kohei <email>kaigai@ak.jp.nec.com</email> | ||
</para> | ||
</sect2> | ||
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</sect1> |
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