181 lines
6.6 KiB
Python
181 lines
6.6 KiB
Python
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#!/usr/bin/python
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# -*- coding: utf-8 -*-
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# Copyright: (c) 2014, Nate Coraor <nate@bx.psu.edu>
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# GNU General Public License v3.0+ (see COPYING or https://www.gnu.org/licenses/gpl-3.0.txt)
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from __future__ import absolute_import, division, print_function
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__metaclass__ = type
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DOCUMENTATION = r'''
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---
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module: capabilities
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short_description: Manage Linux capabilities
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description:
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- This module manipulates files privileges using the Linux capabilities(7) system.
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options:
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path:
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description:
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- Specifies the path to the file to be managed.
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type: str
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required: yes
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aliases: [ key ]
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capability:
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description:
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- Desired capability to set (with operator and flags, if state is C(present)) or remove (if state is C(absent))
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type: str
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required: yes
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aliases: [ cap ]
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state:
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description:
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- Whether the entry should be present or absent in the file's capabilities.
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type: str
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choices: [ absent, present ]
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default: present
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notes:
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- The capabilities system will automatically transform operators and flags into the effective set,
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so for example, C(cap_foo=ep) will probably become C(cap_foo+ep).
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- This module does not attempt to determine the final operator and flags to compare,
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so you will want to ensure that your capabilities argument matches the final capabilities.
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author:
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- Nate Coraor (@natefoo)
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'''
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EXAMPLES = r'''
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- name: Set cap_sys_chroot+ep on /foo
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community.general.capabilities:
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path: /foo
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capability: cap_sys_chroot+ep
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state: present
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- name: Remove cap_net_bind_service from /bar
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community.general.capabilities:
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path: /bar
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capability: cap_net_bind_service
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state: absent
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'''
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from ansible.module_utils.basic import AnsibleModule
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OPS = ('=', '-', '+')
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class CapabilitiesModule(object):
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platform = 'Linux'
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distribution = None
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def __init__(self, module):
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self.module = module
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self.path = module.params['path'].strip()
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self.capability = module.params['capability'].strip().lower()
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self.state = module.params['state']
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self.getcap_cmd = module.get_bin_path('getcap', required=True)
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self.setcap_cmd = module.get_bin_path('setcap', required=True)
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self.capability_tup = self._parse_cap(self.capability, op_required=self.state == 'present')
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self.run()
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def run(self):
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current = self.getcap(self.path)
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caps = [cap[0] for cap in current]
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if self.state == 'present' and self.capability_tup not in current:
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# need to add capability
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if self.module.check_mode:
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self.module.exit_json(changed=True, msg='capabilities changed')
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else:
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# remove from current cap list if it's already set (but op/flags differ)
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current = list(filter(lambda x: x[0] != self.capability_tup[0], current))
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# add new cap with correct op/flags
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current.append(self.capability_tup)
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self.module.exit_json(changed=True, state=self.state, msg='capabilities changed', stdout=self.setcap(self.path, current))
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elif self.state == 'absent' and self.capability_tup[0] in caps:
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# need to remove capability
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if self.module.check_mode:
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self.module.exit_json(changed=True, msg='capabilities changed')
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else:
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# remove from current cap list and then set current list
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current = filter(lambda x: x[0] != self.capability_tup[0], current)
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self.module.exit_json(changed=True, state=self.state, msg='capabilities changed', stdout=self.setcap(self.path, current))
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self.module.exit_json(changed=False, state=self.state)
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def getcap(self, path):
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rval = []
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cmd = "%s -v %s" % (self.getcap_cmd, path)
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rc, stdout, stderr = self.module.run_command(cmd)
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# If file xattrs are set but no caps are set the output will be:
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# '/foo ='
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# If file xattrs are unset the output will be:
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# '/foo'
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# If the file does not exist, the stderr will be (with rc == 0...):
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# '/foo (No such file or directory)'
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if rc != 0 or stderr != "":
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self.module.fail_json(msg="Unable to get capabilities of %s" % path, stdout=stdout.strip(), stderr=stderr)
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if stdout.strip() != path:
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if ' =' in stdout:
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# process output of an older version of libcap
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caps = stdout.split(' =')[1].strip().split()
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else:
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# otherwise, we have a newer version here
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# see original commit message of cap/v0.2.40-18-g177cd41 in libcap.git
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caps = stdout.split()[1].strip().split()
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for cap in caps:
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cap = cap.lower()
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# getcap condenses capabilities with the same op/flags into a
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# comma-separated list, so we have to parse that
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if ',' in cap:
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cap_group = cap.split(',')
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cap_group[-1], op, flags = self._parse_cap(cap_group[-1])
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for subcap in cap_group:
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rval.append((subcap, op, flags))
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else:
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rval.append(self._parse_cap(cap))
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return rval
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def setcap(self, path, caps):
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caps = ' '.join([''.join(cap) for cap in caps])
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cmd = "%s '%s' %s" % (self.setcap_cmd, caps, path)
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rc, stdout, stderr = self.module.run_command(cmd)
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if rc != 0:
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self.module.fail_json(msg="Unable to set capabilities of %s" % path, stdout=stdout, stderr=stderr)
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else:
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return stdout
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def _parse_cap(self, cap, op_required=True):
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opind = -1
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try:
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i = 0
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while opind == -1:
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opind = cap.find(OPS[i])
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i += 1
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except Exception:
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if op_required:
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self.module.fail_json(msg="Couldn't find operator (one of: %s)" % str(OPS))
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else:
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return (cap, None, None)
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op = cap[opind]
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cap, flags = cap.split(op)
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return (cap, op, flags)
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# ==============================================================
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# main
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def main():
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# defining module
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module = AnsibleModule(
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argument_spec=dict(
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path=dict(type='str', required=True, aliases=['key']),
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capability=dict(type='str', required=True, aliases=['cap']),
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state=dict(type='str', default='present', choices=['absent', 'present']),
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),
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supports_check_mode=True,
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)
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CapabilitiesModule(module)
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if __name__ == '__main__':
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main()
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