upsd.conf(5) - Waikato Linux Users Group

UPSD.CONF

NAME DESCRIPTION ACCESS CONTROL CONFIGURATION ACCESS CONTROL EXAMPLES ACCESS CONTROL MATCHING ACCESS CONTROL: POTENTIAL PROBLEMS TO AVOID OTHER CONFIGURATION DIRECTIVES SEE ALSO

NAME

upsd.conf - Configuration for Network UPS Tools upsd

DESCRIPTION

upsd uses this file to control access to the server and set some other miscellaneous configuration values. This file will contain passwords for your upsmon(8) clients, so keep it secure. Ideally, only the upsd process should be able to read it.

ACCESS CONTROL CONFIGURATION

ACL name netblock

Define an Access Control List (ACL) called name that contains the network netblock. The netblock can be either the old style, such as this for a traditional ''

ACL mynet 192.168.50.0/255.255.255.0

Or, you can use new-style

ACL mynet 192.168.50.0/24

To just list one host, it would look like one of these:

ACL mybox 192.168.50.1/255.255.255.255

ACL mybox 192.168.50.1/32

ACLs are used whenever you need to refer to a network or host, such as in ACCESS definitions (below) and with upsd.users__(5).

ACCESS action level aclname password''

Define the access to commands at level level by clients in the network defined by ACL aclname, optionally requiring a password password.

The action can be one of three values:

grant - allow the clients to perform commands at this level.

deny - deny the clients access to commands at this level.

drop - like deny, but don't even respond to their query.

The level relates to the complexity of the command. More important functions like editing variables inside the UPS require more privileges than merely checking the status. Each level includes the powers of the one before it. Here are the valid levels:

base - Allows TCP connections and very simple queries. Valid commands are VER and HELP.

monitor -

master - upsmon(8) process. MASTER is allowed so upsmon can check its privileges, and FSD allows it to set the

manager - upsd.users__(5).

all - match any level. This really only should be used for

The aclname is just one of your ACL definitions, as explained above.

Finally, the password is optional, and only applies to the higher level functions. The client is required to send this password to the server before any ''

ACCESS CONTROL EXAMPLES

Here is an example configuration to show some of what is possible.

an abuser is silently dropped
everyone not yet covered is denied nicely

ACL server 10.20.30.1/32

ACL workstation 10.20.30.2/32 ACL webserver 10.20.30.3/32 ACL abuser 192.168.255.128/32 ACL all 0.0.0.0/0 ACCESS grant master server magicpass ACCESS grant login workstation anotherpass ACCESS grant monitor webserver ACCESS drop all abuser ACCESS deny all all

ACCESS CONTROL MATCHING

Access controls should go from most specific to least specific. The first match with a sufficient access level is the one used when applying permissions.

Along the same lines, everyone is a member of

If you don't have a final

ACCESS CONTROL: POTENTIAL PROBLEMS TO AVOID

You can get into a bit of trouble if things are defined out

of order. Take the following example: ACCESS grant master myhost pass2

ACCESS grant login myhost pass1

That looks fine at a glance, but will cause problems whenever someone on

The solution is to put the most powerful lines last, so they don't match too early.

ACCESS grant login myhost pass1

ACCESS grant master myhost pass2

This way, the manager functions miss the first line entirely and instead match the second one, which has the right password.

OTHER CONFIGURATION DIRECTIVES

MAXAGE seconds

upsd usually allows the data from a driver to go up to 15 seconds without an update before declaring it

You should only use this if your model program has difficulties keeping the data fresh within the normal 15 second interval. Watch the syslog for notifications from upsd about staleness.

STATEPATH path

Tell upsd to look for the state files in path rather than the default that was compiled into the program.