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Novell eDirectory 8.8 Administration Guide
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6
7.5 Ensuring Secure iMonitor Operations
Securing access to your iMonitor environment involves the following protective steps:
1. Use a firewall and provide VPN access (this also applies to Novell iManager and any other
Web-based service that should have restricted access).
2. Whether a firewall is in place or not, limit the type of access allowed through iMonitor to
further protect against Denial of Service (DoS) attacks.
Although substantial efforts have been made to ensure that iMonitor validates the data it
receives via URL requests, it is nearly impossible to guarantee that every conceivable invalid
input is rejected. To reduce the risk of DoS attacks via invalid URLs, there are three levels of
access that can be controlled through
iMonitor’s configuration file
using the LockMask: option.
Level 1 is the default because many administrators do not have supervisory access to every
server in the tree but might need to use the iMonitor service on a server that their servers
interact with.
NOTE:
There are several features of iMonitor, such as Repair and Trace, that require
supervisor equivalency to access regardless of the LockMask setting.
Access Level
Description
0
Require no authentication before iMonitor processes URLs. In this case,
the eDirectory rights of the .[Public]. identity are applied to any request,
and information displayed by iMonitor is restricted to the rights of the
.[Public]. user. However, because no authentication is required to send
URLs to iMonitor, iMonitor might be vulnerable to DoS attacks that are
based on sending garbage in the URL.
1 (Default)
Before iMonitor processes URLs, require successful authentication as
some eDirectory identity. In this case, the eDirectory rights of that identity
are applied to any request and are, therefore, restricted by those rights.
The same DoS vulnerability as level 0 exists, except the attack must be
launched by someone who has actually authenticated to the server. Until a
successful authentication occurs, the response to any iMonitor URL
request is a login dialog box, so iMonitor should be impervious to attacks
by unauthenticated users when it is configured in this state.
2
Before iMonitor processes URLs, require successful authentication as an
eDirectory identity that has supervisor equivalency on the server that
iMonitor is authenticating to. The same DoS vulnerability as level 1 exists,
except the attack must now be launched by someone who has actually
authenticated as a supervisor of the server. Until a successful
authentication occurs, the response to any iMonitor URL request is a login
dialog box, so iMonitor should be impervious to attacks by unauthenticated
users and non-supervisor authenticated users when it is configured in this
state.
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