Restricting connections with IP filtering
editRestricting connections with IP filtering
editYou can apply IP filtering to application clients, node clients, or transport clients, in addition to other nodes that are attempting to join the cluster.
If a node’s IP address is on the blacklist, the Elasticsearch security features allow the connection to Elasticsearch but it is be dropped immediately and no requests are processed.
Elasticsearch installations are not designed to be publicly accessible over the Internet. IP Filtering and the other capabilities of the Elasticsearch security features do not change this condition.
Enabling IP filtering
editThe Elasticsearch security features contain an access control feature that allows or rejects hosts, domains, or subnets. If the operator privileges feature is enabled, only operator users can update these settings.
You configure IP filtering by specifying the xpack.security.transport.filter.allow
and
xpack.security.transport.filter.deny
settings in elasticsearch.yml
. Allow rules
take precedence over the deny rules.
Unless explicitly specified, xpack.security.http.filter.*
settings default to
the corresponding xpack.security.transport.filter.*
setting’s value.
xpack.security.transport.filter.allow: "192.168.0.1" xpack.security.transport.filter.deny: "192.168.0.0/24"
The _all
keyword can be used to deny all connections that are not explicitly
allowed.
xpack.security.transport.filter.allow: [ "192.168.0.1", "192.168.0.2", "192.168.0.3", "192.168.0.4" ] xpack.security.transport.filter.deny: _all
IP filtering configuration also support IPv6 addresses.
xpack.security.transport.filter.allow: "2001:0db8:1234::/48" xpack.security.transport.filter.deny: "1234:0db8:85a3:0000:0000:8a2e:0370:7334"
You can also filter by hostnames when DNS lookups are available.
xpack.security.transport.filter.allow: localhost xpack.security.transport.filter.deny: '*.google.com'
Disabling IP Filtering
editDisabling IP filtering can slightly improve performance under some conditions.
To disable IP filtering entirely, set the value of the xpack.security.transport.filter.enabled
setting in the elasticsearch.yml
configuration file to false
.
xpack.security.transport.filter.enabled: false
You can also disable IP filtering for the transport protocol but enable it for HTTP only.
xpack.security.transport.filter.enabled: false xpack.security.http.filter.enabled: true
Specifying TCP transport profiles
editTCP transport profiles enable Elasticsearch to bind on multiple hosts. The Elasticsearch security features enable you to apply different IP filtering on different profiles.
xpack.security.transport.filter.allow: 172.16.0.0/24 xpack.security.transport.filter.deny: _all transport.profiles.client.xpack.security.filter.allow: 192.168.0.0/24 transport.profiles.client.xpack.security.filter.deny: _all
When you do not specify a profile, default
is used automatically.
HTTP filtering
editYou may want to have different IP filtering for the transport and HTTP protocols.
xpack.security.transport.filter.allow: localhost xpack.security.transport.filter.deny: '*.google.com' xpack.security.http.filter.allow: 172.16.0.0/16 xpack.security.http.filter.deny: _all
Dynamically updating IP filter settings
editIn case of running in an environment with highly dynamic IP addresses like cloud based hosting, it is very hard to know the IP addresses upfront when provisioning a machine. Instead of changing the configuration file and restarting the node, you can use the Cluster Update Settings API. For example:
response = client.cluster.put_settings( body: { persistent: { "xpack.security.transport.filter.allow": '172.16.0.0/24' } } ) puts response
PUT /_cluster/settings { "persistent" : { "xpack.security.transport.filter.allow" : "172.16.0.0/24" } }
You can also dynamically disable filtering completely:
response = client.cluster.put_settings( body: { persistent: { "xpack.security.transport.filter.enabled": false } } ) puts response
PUT /_cluster/settings { "persistent" : { "xpack.security.transport.filter.enabled" : false } }
In order to avoid locking yourself out of the cluster, the default bound transport address will never be denied. This means you can always SSH into a system and use curl to apply changes.