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+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /><title>F.26. passwordcheck</title><link rel="stylesheet" type="text/css" href="stylesheet.css" /><link rev="made" href="pgsql-docs@lists.postgresql.org" /><meta name="generator" content="DocBook XSL Stylesheets Vsnapshot" /><link rel="prev" href="pageinspect.html" title="F.25. pageinspect" /><link rel="next" href="pgbuffercache.html" title="F.27. pg_buffercache" /></head><body id="docContent" class="container-fluid col-10"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="5" align="center">F.26. passwordcheck</th></tr><tr><td width="10%" align="left"><a accesskey="p" href="pageinspect.html" title="F.25. pageinspect">Prev</a> </td><td width="10%" align="left"><a accesskey="u" href="contrib.html" title="Appendix F. Additional Supplied Modules">Up</a></td><th width="60%" align="center">Appendix F. Additional Supplied Modules</th><td width="10%" align="right"><a accesskey="h" href="index.html" title="PostgreSQL 15.4 Documentation">Home</a></td><td width="10%" align="right"> <a accesskey="n" href="pgbuffercache.html" title="F.27. pg_buffercache">Next</a></td></tr></table><hr /></div><div class="sect1" id="PASSWORDCHECK"><div class="titlepage"><div><div><h2 class="title" style="clear: both">F.26. passwordcheck</h2></div></div></div><a id="id-1.11.7.35.2" class="indexterm"></a><p>
+  The <code class="filename">passwordcheck</code> module checks users' passwords
+  whenever they are set with
+  <a class="xref" href="sql-createrole.html" title="CREATE ROLE"><span class="refentrytitle">CREATE ROLE</span></a> or
+  <a class="xref" href="sql-alterrole.html" title="ALTER ROLE"><span class="refentrytitle">ALTER ROLE</span></a>.
+  If a password is considered too weak, it will be rejected and
+  the command will terminate with an error.
+ </p><p>
+  To enable this module, add <code class="literal">'$libdir/passwordcheck'</code>
+  to <a class="xref" href="runtime-config-client.html#GUC-SHARED-PRELOAD-LIBRARIES">shared_preload_libraries</a> in
+  <code class="filename">postgresql.conf</code>, then restart the server.
+ </p><p>
+  You can adapt this module to your needs by changing the source code.
+  For example, you can use
+  <a class="ulink" href="https://github.com/cracklib/cracklib" target="_top">CrackLib</a>
+  to check passwords — this only requires uncommenting
+  two lines in the <code class="filename">Makefile</code> and rebuilding the
+  module.  (We cannot include <span class="productname">CrackLib</span>
+  by default for license reasons.)
+  Without <span class="productname">CrackLib</span>, the module enforces a few
+  simple rules for password strength, which you can modify or extend
+  as you see fit.
+ </p><div class="caution"><h3 class="title">Caution</h3><p>
+   To prevent unencrypted passwords from being sent across the network,
+   written to the server log or otherwise stolen by a database administrator,
+   <span class="productname">PostgreSQL</span> allows the user to supply
+   pre-encrypted passwords. Many client programs make use of this
+   functionality and encrypt the password before sending it to the server.
+  </p><p>
+   This limits the usefulness of the <code class="filename">passwordcheck</code>
+   module, because in that case it can only try to guess the password.
+   For this reason, <code class="filename">passwordcheck</code> is not
+   recommended if your security requirements are high.
+   It is more secure to use an external authentication method such as GSSAPI
+   (see <a class="xref" href="client-authentication.html" title="Chapter 21. Client Authentication">Chapter 21</a>) than to rely on
+   passwords within the database.
+  </p><p>
+   Alternatively, you could modify <code class="filename">passwordcheck</code>
+   to reject pre-encrypted passwords, but forcing users to set their
+   passwords in clear text carries its own security risks.
+  </p></div></div><div class="navfooter"><hr /><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="pageinspect.html" title="F.25. pageinspect">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="contrib.html" title="Appendix F. Additional Supplied Modules">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="pgbuffercache.html" title="F.27. pg_buffercache">Next</a></td></tr><tr><td width="40%" align="left" valign="top">F.25. pageinspect </td><td width="20%" align="center"><a accesskey="h" href="index.html" title="PostgreSQL 15.4 Documentation">Home</a></td><td width="40%" align="right" valign="top"> F.27. pg_buffercache</td></tr></table></div></body></html>
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