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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>20.9. Peer 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-ident.html" title="20.8. Ident Authentication" /><link rel="next" href="auth-ldap.html" title="20.10. LDAP 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">20.9. Peer Authentication</th></tr><tr><td width="10%" align="left"><a accesskey="p" href="auth-ident.html" title="20.8. Ident 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 11.5 Documentation">Home</a></td><td width="10%" align="right"> <a accesskey="n" href="auth-ldap.html" title="20.10. LDAP Authentication">Next</a></td></tr></table><hr></hr></div><div class="sect1" id="AUTH-PEER"><div class="titlepage"><div><div><h2 class="title" style="clear: both">20.9. Peer Authentication</h2></div></div></div><a id="id-1.6.7.16.2" class="indexterm"></a><p>
The peer authentication method works by obtaining the client's
operating system user name from the kernel and using it as the
allowed database user name (with optional user name mapping). This
method is only supported on local connections.
</p><p>
The following configuration options are supported for <span class="productname">peer</span>:
</p><div class="variablelist"><dl class="variablelist"><dt><span class="term"><code class="literal">map</code></span></dt><dd><p>
Allows for mapping between system and database user names. See
<a class="xref" href="auth-username-maps.html" title="20.2. User Name Maps">Section 20.2</a> for details.
</p></dd></dl></div><p>
</p><p>
Peer authentication is only available on operating systems providing
the <code class="function">getpeereid()</code> function, the <code class="symbol">SO_PEERCRED</code>
socket parameter, or similar mechanisms. Currently that includes
<span class="systemitem">Linux</span>,
most flavors of <span class="systemitem">BSD</span> including
<span class="systemitem">macOS</span>,
and <span class="systemitem">Solaris</span>.
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