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| author | Rainer Gerhards <rgerhards@adiscon.com> | 2008-11-26 14:17:36 +0100 |
|---|---|---|
| committer | Rainer Gerhards <rgerhards@adiscon.com> | 2008-11-26 14:17:36 +0100 |
| commit | dc478db1ca80ef222f83985b539dfec1c66063e2 (patch) | |
| tree | 55e26c44026d2046b079715a8ed950defd4c1c40 /doc/droppriv.html | |
| parent | 57c9a3accee3a3e9b46d984c76c9aae7e2ec9c27 (diff) | |
| download | rsyslog-dc478db1ca80ef222f83985b539dfec1c66063e2.tar.gz rsyslog-dc478db1ca80ef222f83985b539dfec1c66063e2.tar.xz rsyslog-dc478db1ca80ef222f83985b539dfec1c66063e2.zip | |
added ability to drop privileges
Added $PrivDropToGroup, $PrivDropToUser, $PrivDropToGroupID,
$PrivDropToUserID config directives to enable dropping privileges.
This is an effort to provide a security enhancement. For the limits of this
approach, see http://wiki.rsyslog.com/index.php/Security
Diffstat (limited to 'doc/droppriv.html')
| -rw-r--r-- | doc/droppriv.html | 60 |
1 files changed, 60 insertions, 0 deletions
diff --git a/doc/droppriv.html b/doc/droppriv.html new file mode 100644 index 00000000..7293e872 --- /dev/null +++ b/doc/droppriv.html @@ -0,0 +1,60 @@ +<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> +<html><head><title>dropping privileges in rsyslog</title> +</head> +<body> +<h1>Dropping privileges in rsyslog</h1> +<p><b>Available since: </b> 4.1.1</p> +<p><b>Description</b>:</p> +<p> +Rsyslogd provides the ability to drop privileges by +impersonating as another user and/or group after startup. + +<p>Please note that due to POSIX standards, rsyslogd always needs to start +up as root if there is a listener who must bind to a network port below 1024. +For example, the UDP listener usually needs to listen to 514 and as such +rsyslogd needs to start up as root. + +<p>If you do not need this functionality, you can start rsyslog directly as an ordinary +user. That is probably the safest way of operations. However, if a startup as +root is required, you can use the $PrivDropToGroup and $PrivDropToUser config +directives to specify a group and/or user that rsyslogd should drop to after initialization. +Once this happend, the daemon runs without high privileges (depending, of +course, on the permissions of the user account you specified). +<p>There is some additional information available in the +<a href="http://wiki.rsyslog.com/index.php/Security#Dropping_Privileges">rsyslog wiki</a>. +<p><b>Configuration Directives</b>:</p> +<ul> +<li><b>$PrivDropToUser</b><br> +Name of the user rsyslog should run under after startup. Please note that +this user is looked up in the system tables. If the lookup fails, privileges are +NOT dropped. Thus it is advisable to use the less convenient $PrivDropToUserID directive. +If the user id can be looked up, but can not be set, rsyslog aborts. +<br> +</li> +<li><b>$PrivDropToUserID</b><br> +Much the same as $PrivDropToUser, except that a numerical user id instead of a name +is specified.Thus, privilege drop will always happen. +rsyslogd aborts. +<li><b>$PrivDropToGroup</b><br> +Name of the group rsyslog should run under after startup. Please note that +this user is looked up in the system tables. If the lookup fails, privileges are +NOT dropped. Thus it is advisable to use the less convenient $PrivDropToGroupID directive. +Note that all supplementary groups are removed from the process if $PrivDropToGroup is +specified. +If the group id can be looked up, but can not be set, rsyslog aborts. +<br> +</li> +<li><b>$PrivDropToGroupID</b><br> +Much the same as $PrivDropToGroup, except that a numerical group id instead of a name +is specified. Thus, privilege drop will always happen. +</ul> +<p>[<a href="rsyslog_conf.html">rsyslog.conf overview</a>] +[<a href="manual.html">manual index</a>] [<a href="http://www.rsyslog.com/">rsyslog site</a>]</p> +<p><font size="2">This documentation is part of the <a href="http://www.rsyslog.com/">rsyslog</a> +project.<br> +Copyright © 2008 by <a href="http://www.gerhards.net/rainer">Rainer +Gerhards</a> and +<a href="http://www.adiscon.com/">Adiscon</a>. +Released under the GNU GPL version 3 or higher.</font></p> + +</body></html> |