#
# Copyright (C) 2020 The Falco Authors.
#
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
- rule: Open From Cat
  desc: A process named cat does an open
  condition: evt.type=open and proc.name=cat
  output: "An open was seen (command=%proc.cmdline)"
  exceptions:
    - name: proc_name
      fields: [proc.name]
      values:
        - [not-cat]
    - name: proc_name_cmdline
      fields: [proc.name, proc.cmdline]
      values:
        - [not-cat, "cat /dev/null"]
    - name: proc_name_cmdline_pname
      fields: [proc.name, proc.cmdline, proc.pname]
      values:
        - [cat, "cat /dev/null", bash]
  priority: WARNING
