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<!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>21.11. RADIUS Authentication</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="auth-ldap.html" title="21.10. LDAP Authentication" /><link rel="next" href="auth-cert.html" title="21.12. Certificate Authentication" /></head><body id="docContent" class="container-fluid col-10"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="5" align="center">21.11. RADIUS Authentication</th></tr><tr><td width="10%" align="left"><a accesskey="p" href="auth-ldap.html" title="21.10. LDAP Authentication">Prev</a> </td><td width="10%" align="left"><a accesskey="u" href="client-authentication.html" title="Chapter 21. Client Authentication">Up</a></td><th width="60%" align="center">Chapter 21. Client Authentication</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="auth-cert.html" title="21.12. Certificate Authentication">Next</a></td></tr></table><hr /></div><div class="sect1" id="AUTH-RADIUS"><div class="titlepage"><div><div><h2 class="title" style="clear: both">21.11. RADIUS Authentication</h2></div></div></div><a id="id-1.6.8.18.2" class="indexterm"></a><p>
This authentication method operates similarly to
<code class="literal">password</code> except that it uses RADIUS
as the password verification method. RADIUS is used only to validate
the user name/password pairs. Therefore the user must already
exist in the database before RADIUS can be used for
authentication.
</p><p>
When using RADIUS authentication, an Access Request message will be sent
to the configured RADIUS server. This request will be of type
<code class="literal">Authenticate Only</code>, and include parameters for
<code class="literal">user name</code>, <code class="literal">password</code> (encrypted) and
<code class="literal">NAS Identifier</code>. The request will be encrypted using
a secret shared with the server. The RADIUS server will respond to
this request with either <code class="literal">Access Accept</code> or
<code class="literal">Access Reject</code>. There is no support for RADIUS accounting.
</p><p>
Multiple RADIUS servers can be specified, in which case they will
be tried sequentially. If a negative response is received from
a server, the authentication will fail. If no response is received,
the next server in the list will be tried. To specify multiple
servers, separate the server names with commas and surround the list
with double quotes. If multiple servers are specified, the other
RADIUS options can also be given as comma-separated lists, to provide
individual values for each server. They can also be specified as
a single value, in which case that value will apply to all servers.
</p><p>
The following configuration options are supported for RADIUS:
</p><div class="variablelist"><dl class="variablelist"><dt><span class="term"><code class="literal">radiusservers</code></span></dt><dd><p>
The DNS names or IP addresses of the RADIUS servers to connect to.
This parameter is required.
</p></dd><dt><span class="term"><code class="literal">radiussecrets</code></span></dt><dd><p>
The shared secrets used when talking securely to the RADIUS
servers. This must have exactly the same value on the PostgreSQL
and RADIUS servers. It is recommended that this be a string of
at least 16 characters. This parameter is required.
</p><div class="note"><h3 class="title">Note</h3><p>
The encryption vector used will only be cryptographically
strong if <span class="productname">PostgreSQL</span> is built with support for
<span class="productname">OpenSSL</span>. In other cases, the transmission to the
RADIUS server should only be considered obfuscated, not secured, and
external security measures should be applied if necessary.
</p></div><p>
</p></dd><dt><span class="term"><code class="literal">radiusports</code></span></dt><dd><p>
The port numbers to connect to on the RADIUS servers. If no port
is specified, the default RADIUS port (<code class="literal">1812</code>)
will be used.
</p></dd><dt><span class="term"><code class="literal">radiusidentifiers</code></span></dt><dd><p>
The strings to be used as <code class="literal">NAS Identifier</code> in the
RADIUS requests. This parameter can be used, for example, to
identify which database cluster the user is attempting to connect
to, which can be useful for policy matching on
the RADIUS server. If no identifier is specified, the default
<code class="literal">postgresql</code> will be used.
</p></dd></dl></div><p>
</p><p>
If it is necessary to have a comma or whitespace in a RADIUS parameter
value, that can be done by putting double quotes around the value, but
it is tedious because two layers of double-quoting are now required.
An example of putting whitespace into RADIUS secret strings is:
</p><pre class="programlisting">
host ... radius radiusservers="server1,server2" radiussecrets="""secret one"",""secret two"""
</pre><p>
</p></div><div class="navfooter"><hr /><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="auth-ldap.html" title="21.10. LDAP Authentication">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="client-authentication.html" title="Chapter 21. Client Authentication">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="auth-cert.html" title="21.12. Certificate Authentication">Next</a></td></tr><tr><td width="40%" align="left" valign="top">21.10. LDAP Authentication </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"> 21.12. Certificate Authentication</td></tr></table></div></body></html>
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