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rule update: add exception for rule change thread namespace #678

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Jun 20, 2019
Merged

rule update: add exception for rule change thread namespace #678

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13 changes: 10 additions & 3 deletions rules/falco_rules.yaml
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Original file line number Diff line number Diff line change
Expand Up @@ -159,7 +159,7 @@
items: [docker, dockerd, exe, docker-compose, docker-entrypoi, docker-runc-cur, docker-current, dockerd-current]

- list: k8s_binaries
items: [hyperkube, skydns, kube2sky, exechealthz, weave-net, loopback, bridge, openshift-sdn]
items: [hyperkube, skydns, kube2sky, exechealthz, weave-net, loopback, bridge, openshift-sdn, openshift]

- list: lxd_binaries
items: [lxd, lxcfs]
Expand Down Expand Up @@ -243,7 +243,7 @@
# A canonical set of processes that run other programs with different
# privileges or as a different user.
- list: userexec_binaries
items: [sudo, su, suexec, critical-stack]
items: [sudo, su, suexec, critical-stack, dzdo]

- list: known_setuid_binaries
items: [
Expand Down Expand Up @@ -1470,14 +1470,20 @@
- list: user_known_change_thread_namespace_binaries
items: []

- list: network_plugin_binaries
items: [aws-cni, azure-vnet]

- macro: calico_node
condition: (container.image.repository endswith calico/node and proc.name=calico-node)

- rule: Change thread namespace
desc: >
an attempt to change a program/thread\'s namespace (commonly done
as a part of creating a container) by calling setns.
condition: >
evt.type = setns
and not proc.name in (docker_binaries, k8s_binaries, lxd_binaries, sysdigcloud_binaries,
sysdig, nsenter, calico, oci-umount)
sysdig, nsenter, calico, oci-umount, network_plugin_binaries)
and not proc.name in (user_known_change_thread_namespace_binaries)
and not proc.name startswith "runc"
and not proc.cmdline startswith "containerd"
Expand All @@ -1487,6 +1493,7 @@
and not kubelet_running_loopback
and not rancher_agent
and not rancher_network_manager
and not calico_node
output: >
Namespace change (setns) by unexpected program (user=%user.name command=%proc.cmdline
parent=%proc.pname %container.info container_id=%container.id image=%container.image.repository)
Expand Down