Merge pull request #974 from goozbach/add_selinux_module

add selinux module

library/selinux

+#!/usr/bin/python
+# -*- coding: utf-8 -*-
+
+# (c) 2012, Derek Carter<goozbach@friocorte.com>
+#
+# This file is part of Ansible
+#
+# Ansible is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# Ansible is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with Ansible.  If not, see <http://www.gnu.org/licenses/>.
+
+# selinux module - change policy and state of SELinux
+# usage:
+#
+# selinux policy=<SELINUX_POLICY> state=[enforcing|permissive|disabled] configfile=[SELINUX_CONFIG_FILE]
+#
+#    configfile defaults to /etc/selinux/config
+#    policy files should be installed via the yum/apt modules
+#
+# bugs:
+# 
+# Not tested on any debian based system
+
+import os
+import re
+
+try:
+    import selinux
+    HAVE_SELINUX=True
+except ImportError:
+    HAVE_SELINUX=False
+
+# getter subroutines
+def get_config_state(configfile):
+    myfile = open(configfile, "r")
+    lines = myfile.readlines()
+    myfile.close()
+    for line in lines:
+        stateline = re.match('^SELINUX=.*$', line)
+        if (stateline):
+            return(line.split('=')[1].strip())
+
+def get_config_policy(configfile):
+    myfile = open(configfile, "r")
+    lines = myfile.readlines()
+    myfile.close()
+    for line in lines:
+        stateline = re.match('^SELINUXTYPE=.*$', line)
+        if (stateline):
+            return(line.split('=')[1].strip())
+
+# setter subroutines
+def set_config_state(state, configfile):
+    #SELINUX=permissive
+    # edit config file with state value
+    stateline='SELINUX=%s' % state
+    myfile = open(configfile, "r")
+    lines = myfile.readlines()
+    myfile.close()
+    myfile = open(configfile, "w")
+    for line in lines:
+        myfile.write(re.sub(r'^SELINUX=.*', stateline, line))
+    myfile.close()
+
+def set_state(state):
+    if (state == 'enforcing'):
+        selinux.security_setenforce(1)
+    elif (state == 'permissive'):
+        selinux.security_setenforce(0)
+    elif (state == 'disabled'):
+        pass
+    else:
+        msg = 'trying to set invalid runtime state %s' % state
+        fail_json(msg=msg)
+
+def set_config_policy(policy, configfile):
+    # edit config file with state value
+    #SELINUXTYPE=targeted 
+    policyline='SELINUXTYPE=%s' % policy
+    myfile = open(configfile, "r")
+    lines = myfile.readlines()
+    myfile.close()
+    myfile = open(configfile, "w")
+    for line in lines:
+        myfile.write(re.sub(r'^SELINUXTYPE=.*', policyline, line))
+    myfile.close()
+
+def main():
+    if (not HAVE_SELINUX):
+        fail_json(msg='python-selinux required for this module')
+
+    module = AnsibleModule(
+        argument_spec = dict(
+            policy=dict(required=True),
+            state=dict(choices=['enforcing', 'permissive', 'disabled'], default='enforcing'),
+            configfile=dict(aliases=['conf','file'], default='/etc/selinux/config')
+        )
+    )
+
+    # global vars
+    changed=False
+    msgs                  = []
+    configfile            = module.params['configfile']
+    policy                = module.params['policy']
+    state                 = module.params['state']
+    runtime_enabled       = selinux.is_selinux_enabled()
+    runtime_policy        = selinux.selinux_getpolicytype()[1]
+    runtime_state         = 'disabled'
+    if (runtime_enabled):
+        # enabled means 'enforcing' or 'permissive'
+        if (selinux.security_getenforce()):
+            runtime_state = 'enforcing'
+        else:
+            runtime_state = 'permissive'
+    config_policy         = get_config_policy(configfile)
+    config_state          = get_config_state(configfile)
+
+    # check changed values and run changes
+    if (policy != runtime_policy):
+        # cannot change runtime policy
+        msgs.append('reboot to change the loaded policy')
+        changed=True 
+
+    if (policy != config_policy):
+        msgs.append('config policy changed from \'%s\' to \'%s\'' % (config_policy, policy))
+        set_config_policy(policy, configfile)
+        changed=True 
+
+    if (state != runtime_state):
+        if (state == 'disabled'):
+            msgs.append('disabled state will take effect next reboot')
+        else:
+            msgs.append('runtime state changed from \'%s\' to \'%s\'' % (runtime_state, state))
+        set_state(state)
+        changed=True 
+
+    if (state != config_state):
+        msgs.append('config state changed from \'%s\' to \'%s\'' % (config_state, state))
+        set_config_state(state, configfile)
+        changed=True 
+ 
+    module.exit_json(changed=changed, msg=', '.join(msgs),
+        configfile=configfile,
+        policy=policy, state=state)
+
+#################################################
+# include magic from lib/ansible/module_common.py
+#<<INCLUDE_ANSIBLE_MODULE_COMMON>>
+
+main()