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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>19.10. Secure TCP/IP Connections with GSSAPI Encryption</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="ssl-tcp.html" title="19.9. Secure TCP/IP Connections with SSL" /><link rel="next" href="ssh-tunnels.html" title="19.11. Secure TCP/IP Connections with SSH Tunnels" /></head><body id="docContent" class="container-fluid col-10"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="5" align="center">19.10. Secure TCP/IP Connections with GSSAPI Encryption</th></tr><tr><td width="10%" align="left"><a accesskey="p" href="ssl-tcp.html" title="19.9. Secure TCP/IP Connections with SSL">Prev</a> </td><td width="10%" align="left"><a accesskey="u" href="runtime.html" title="Chapter 19. Server Setup and Operation">Up</a></td><th width="60%" align="center">Chapter 19. Server Setup and Operation</th><td width="10%" align="right"><a accesskey="h" href="index.html" title="PostgreSQL 15.5 Documentation">Home</a></td><td width="10%" align="right"> <a accesskey="n" href="ssh-tunnels.html" title="19.11. Secure TCP/IP Connections with SSH Tunnels">Next</a></td></tr></table><hr /></div><div class="sect1" id="GSSAPI-ENC"><div class="titlepage"><div><div><h2 class="title" style="clear: both">19.10. Secure TCP/IP Connections with GSSAPI Encryption</h2></div></div></div><div class="toc"><dl class="toc"><dt><span class="sect2"><a href="gssapi-enc.html#GSSAPI-SETUP">19.10.1. Basic Setup</a></span></dt></dl></div><a id="id-1.6.6.13.2" class="indexterm"></a><p>
+   <span class="productname">PostgreSQL</span> also has native support for
+   using <acronym class="acronym">GSSAPI</acronym> to encrypt client/server communications for
+   increased security.  Support requires that a <acronym class="acronym">GSSAPI</acronym>
+   implementation (such as MIT Kerberos) is installed on both client and server
+   systems, and that support in <span class="productname">PostgreSQL</span> is
+   enabled at build time (see <a class="xref" href="installation.html" title="Chapter 17. Installation from Source Code">Chapter 17</a>).
+  </p><div class="sect2" id="GSSAPI-SETUP"><div class="titlepage"><div><div><h3 class="title">19.10.1. Basic Setup</h3></div></div></div><p>
+    The <span class="productname">PostgreSQL</span> server will listen for both
+    normal and <acronym class="acronym">GSSAPI</acronym>-encrypted connections on the same TCP
+    port, and will negotiate with any connecting client whether to
+    use <acronym class="acronym">GSSAPI</acronym> for encryption (and for authentication).  By
+    default, this decision is up to the client (which means it can be
+    downgraded by an attacker); see <a class="xref" href="auth-pg-hba-conf.html" title="21.1. The pg_hba.conf File">Section 21.1</a> about
+    setting up the server to require the use of <acronym class="acronym">GSSAPI</acronym> for
+    some or all connections.
+   </p><p>
+    When using <acronym class="acronym">GSSAPI</acronym> for encryption, it is common to
+    use <acronym class="acronym">GSSAPI</acronym> for authentication as well, since the
+    underlying mechanism will determine both client and server identities
+    (according to the <acronym class="acronym">GSSAPI</acronym> implementation) in any
+    case.  But this is not required;
+    another <span class="productname">PostgreSQL</span> authentication method
+    can be chosen to perform additional verification.
+   </p><p>
+    Other than configuration of the negotiation
+    behavior, <acronym class="acronym">GSSAPI</acronym> encryption requires no setup beyond
+    that which is necessary for GSSAPI authentication.  (For more information
+    on configuring that, see <a class="xref" href="gssapi-auth.html" title="21.6. GSSAPI Authentication">Section 21.6</a>.)
+   </p></div></div><div class="navfooter"><hr /><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="ssl-tcp.html" title="19.9. Secure TCP/IP Connections with SSL">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="runtime.html" title="Chapter 19. Server Setup and Operation">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="ssh-tunnels.html" title="19.11. Secure TCP/IP Connections with SSH Tunnels">Next</a></td></tr><tr><td width="40%" align="left" valign="top">19.9. Secure TCP/IP Connections with SSL </td><td width="20%" align="center"><a accesskey="h" href="index.html" title="PostgreSQL 15.5 Documentation">Home</a></td><td width="40%" align="right" valign="top"> 19.11. Secure TCP/IP Connections with <span class="application">SSH</span> Tunnels</td></tr></table></div></body></html>
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