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- 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://sourceforge.net/projects/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 20. Client Authentication">Chapter 20</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">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="contrib.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="pgbuffercache.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">F.22. pageinspect </td><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td><td width="40%" align="right" valign="top"> F.24. pg_buffercache</td></tr></table></div></body></html>
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