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diff --git a/doc/src/sgml/html/preventing-server-spoofing.html b/doc/src/sgml/html/preventing-server-spoofing.html new file mode 100644 index 0000000..8a88229 --- /dev/null +++ b/doc/src/sgml/html/preventing-server-spoofing.html @@ -0,0 +1,44 @@ +<?xml version="1.0" encoding="UTF-8" standalone="no"?> +<!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>19.7. Preventing Server Spoofing</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="upgrading.html" title="19.6. Upgrading a PostgreSQL Cluster" /><link rel="next" href="encryption-options.html" title="19.8. Encryption Options" /></head><body id="docContent" class="container-fluid col-10"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="5" align="center">19.7. Preventing Server Spoofing</th></tr><tr><td width="10%" align="left"><a accesskey="p" href="upgrading.html" title="19.6. Upgrading a PostgreSQL Cluster">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 15.4 Documentation">Home</a></td><td width="10%" align="right"> <a accesskey="n" href="encryption-options.html" title="19.8. Encryption Options">Next</a></td></tr></table><hr /></div><div class="sect1" id="PREVENTING-SERVER-SPOOFING"><div class="titlepage"><div><div><h2 class="title" style="clear: both">19.7. Preventing Server Spoofing</h2></div></div></div><a id="id-1.6.6.10.2" class="indexterm"></a><p> + While the server is running, it is not possible for a malicious user + to take the place of the normal database server. However, when the + server is down, it is possible for a local user to spoof the normal + server by starting their own server. The spoof server could read + passwords and queries sent by clients, but could not return any data + because the <code class="varname">PGDATA</code> directory would still be secure because + of directory permissions. Spoofing is possible because any user can + start a database server; a client cannot identify an invalid server + unless it is specially configured. + </p><p> + One way to prevent spoofing of <code class="literal">local</code> + connections is to use a Unix domain socket directory (<a class="xref" href="runtime-config-connection.html#GUC-UNIX-SOCKET-DIRECTORIES">unix_socket_directories</a>) that has write permission only + for a trusted local user. This prevents a malicious user from creating + their own socket file in that directory. If you are concerned that + some applications might still reference <code class="filename">/tmp</code> for the + socket file and hence be vulnerable to spoofing, during operating system + startup create a symbolic link <code class="filename">/tmp/.s.PGSQL.5432</code> that points + to the relocated socket file. You also might need to modify your + <code class="filename">/tmp</code> cleanup script to prevent removal of the symbolic link. + </p><p> + Another option for <code class="literal">local</code> connections is for clients to use + <a class="link" href="libpq-connect.html#LIBPQ-CONNECT-REQUIREPEER"><code class="literal">requirepeer</code></a> + to specify the required owner of the server process connected to + the socket. + </p><p> + To prevent spoofing on TCP connections, either use + SSL certificates and make sure that clients check the server's certificate, + or use GSSAPI encryption (or both, if they're on separate connections). + </p><p> + To prevent spoofing with SSL, the server + must be configured to accept only <code class="literal">hostssl</code> connections (<a class="xref" href="auth-pg-hba-conf.html" title="21.1. The pg_hba.conf File">Section 21.1</a>) and have SSL key and certificate files + (<a class="xref" href="ssl-tcp.html" title="19.9. Secure TCP/IP Connections with SSL">Section 19.9</a>). The TCP client must connect using + <code class="literal">sslmode=verify-ca</code> or + <code class="literal">verify-full</code> and have the appropriate root certificate + file installed (<a class="xref" href="libpq-ssl.html#LIBQ-SSL-CERTIFICATES" title="34.19.1. Client Verification of Server Certificates">Section 34.19.1</a>). + </p><p> + To prevent spoofing with GSSAPI, the server must be configured to accept + only <code class="literal">hostgssenc</code> connections + (<a class="xref" href="auth-pg-hba-conf.html" title="21.1. The pg_hba.conf File">Section 21.1</a>) and use <code class="literal">gss</code> + authentication with them. The TCP client must connect + using <code class="literal">gssencmode=require</code>. + </p></div><div class="navfooter"><hr /><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="upgrading.html" title="19.6. Upgrading a PostgreSQL Cluster">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="encryption-options.html" title="19.8. Encryption Options">Next</a></td></tr><tr><td width="40%" align="left" valign="top">19.6. Upgrading a <span class="productname">PostgreSQL</span> Cluster </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"> 19.8. Encryption Options</td></tr></table></div></body></html>
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