Forum: CFEngine Help
Subject: Limit cf-serverd access to certain IPs
Author: toddnni
Link to topic: https://cfengine.com/forum/read.php?3,23620,23620#msg-23620
Hi all,
I am trying to limit access to files according to IP-addresses. Currently I use
complicated structure like this
bundle common network {
vars:
any::
"hostid[192.168.2.10]" string => "000";
"host[000]" string => "192.168.2.10";
"host[000]" string => "example1";
"host[000]" string => "local.net";
"host[000]" slist => { "cf_null" };
"host[000]" string => "location1";
"host[000]" string => "location1 location2";
"hostid[192.168.2.11]" string => "001";
"host[001]" string => "192.168.2.11";
"host[001]" string => "example2";
"host[001]" string => "local.net";
"host[001]" slist => { "kerberos", "kerberos.local.net" };
"host[001]" string => "location2";
"host[001]" string => "location2";
"hostips"
comment => "The list of known IPs.",
slist => getindices("network.hostid");
"hostids"
comment => "Used to iterate over the host array.",
slist => getindices("network.host");
}
bundle server access_rules {
vars:
any::
"hostids" slist => { "@(network.hostids)" };
access:
any::
"$(cf.masterfiles)"
comment => "Allow only known IP-addresses to download policies.",
admit => { "@(network.hostips)" },
ifencrypted => "true";
"/var/secretfiles/ssh.$(network.host[$(hostids)]).$(network.host[$(hostids)]).dsa"
comment => "Only host himself can download his private SSH keys.",
admit => { "$(network.host[$(hostids)])" ),
ifencrypted => "true";
}
The structure may seem overly complicated to you, but every field in the host
array is currently needed. One reason for this structure is that same list can
be used to create hosts files or DNS database.
My configuration works, but I'm worried about performance when the number of
hosts grow
+ performance of cf-agent because of the large array and
+ performance of cf-serverd because of complicated access rules.
This kind of structure might also be painful to upkeep.
What do you think?
1. Should I worry about performance at all?
2. Do you know a better way to handle an IP address list (maybe a hosts file
and parsestringarray())?
3. How do you limit access to policy files?
Thanks for you time.
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