diff options
Diffstat (limited to 'doc/src/sgml/html/perm-functions.html')
| -rw-r--r-- | doc/src/sgml/html/perm-functions.html | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/doc/src/sgml/html/perm-functions.html b/doc/src/sgml/html/perm-functions.html new file mode 100644 index 0000000..4cb60f0 --- /dev/null +++ b/doc/src/sgml/html/perm-functions.html @@ -0,0 +1,22 @@ +<?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>22.6. Function Security</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="predefined-roles.html" title="22.5. Predefined Roles" /><link rel="next" href="managing-databases.html" title="Chapter 23. Managing Databases" /></head><body id="docContent" class="container-fluid col-10"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="5" align="center">22.6. Function Security</th></tr><tr><td width="10%" align="left"><a accesskey="p" href="predefined-roles.html" title="22.5. Predefined Roles">Prev</a> </td><td width="10%" align="left"><a accesskey="u" href="user-manag.html" title="Chapter 22. Database Roles">Up</a></td><th width="60%" align="center">Chapter 22. Database Roles</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="managing-databases.html" title="Chapter 23. Managing Databases">Next</a></td></tr></table><hr /></div><div class="sect1" id="PERM-FUNCTIONS"><div class="titlepage"><div><div><h2 class="title" style="clear: both">22.6. Function Security</h2></div></div></div><p> + Functions, triggers and row-level security policies allow users to insert + code into the backend server that other users might execute + unintentionally. Hence, these mechanisms permit users to <span class="quote">“<span class="quote">Trojan + horse</span>”</span> others with relative ease. The strongest protection is tight + control over who can define objects. Where that is infeasible, write + queries referring only to objects having trusted owners. Remove + from <code class="varname">search_path</code> any schemas that permit untrusted users + to create objects. + </p><p> + Functions run inside the backend + server process with the operating system permissions of the + database server daemon. If the programming language + used for the function allows unchecked memory accesses, it is + possible to change the server's internal data structures. + Hence, among many other things, such functions can circumvent any + system access controls. Function languages that allow such access + are considered <span class="quote">“<span class="quote">untrusted</span>”</span>, and + <span class="productname">PostgreSQL</span> allows only superusers to + create functions written in those languages. + </p></div><div class="navfooter"><hr /><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="predefined-roles.html" title="22.5. Predefined Roles">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="user-manag.html" title="Chapter 22. Database Roles">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="managing-databases.html" title="Chapter 23. Managing Databases">Next</a></td></tr><tr><td width="40%" align="left" valign="top">22.5. Predefined Roles </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"> Chapter 23. Managing Databases</td></tr></table></div></body></html>
\ No newline at end of file |