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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>20.11. 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 V1.79.1" /><link rel="prev" href="auth-ldap.html" title="20.10. LDAP Authentication" /><link rel="next" href="auth-cert.html" title="20.12. Certificate Authentication" /></head><body><div xmlns="http://www.w3.org/TR/xhtml1/transitional" class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="5" align="center">20.11. RADIUS Authentication</th></tr><tr><td width="10%" align="left"><a accesskey="p" href="auth-ldap.html" title="20.10. LDAP Authentication">Prev</a> </td><td width="10%" align="left"><a accesskey="u" href="client-authentication.html" title="Chapter 20. Client Authentication">Up</a></td><th width="60%" align="center">Chapter 20. Client Authentication</th><td width="10%" align="right"><a accesskey="h" href="index.html" title="PostgreSQL 12.4 Documentation">Home</a></td><td width="10%" align="right"> <a accesskey="n" href="auth-cert.html" title="20.12. Certificate Authentication">Next</a></td></tr></table><hr></hr></div><div class="sect1" id="AUTH-RADIUS"><div class="titlepage"><div><div><h2 class="title" style="clear: both">20.11. RADIUS Authentication</h2></div></div></div><a id="id-1.6.7.18.2" 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">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="client-authentication.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="auth-cert.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">20.10. LDAP Authentication </td><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td><td width="40%" align="right" valign="top"> 20.12. Certificate Authentication</td></tr></table></div></body></html>
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