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db88cb8d8f
* Add note about sefcontext doing no restorecon To someone like me who is relatively new to SELinux, setting the "reload" option to yes might suggest that a restorecon is automatically executed after the semanage call, making the new file context effective immediately. I have found out that this is not the case and would like to clarify this to others. +label: docsite_pr * Replace note by one suggested by reviewer Reviewer dagwieers suggested a better notice text during review of my original one, giving recommendations about what to do to actually get the newly chosen SELinux context applied to the file.
259 lines
8 KiB
Python
259 lines
8 KiB
Python
#!/usr/bin/python
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# (c) 2016, Dag Wieers <dag@wieers.com>
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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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ANSIBLE_METADATA = {'metadata_version': '1.1',
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'status': ['preview'],
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'supported_by': 'community'}
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DOCUMENTATION = r'''
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---
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module: sefcontext
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short_description: Manages SELinux file context mapping definitions
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description:
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- Manages SELinux file context mapping definitions.
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- Similar to the C(semanage fcontext) command.
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version_added: '2.2'
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options:
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target:
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description:
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- Target path (expression).
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required: yes
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aliases: [ path ]
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ftype:
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description:
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- File type.
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default: a
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setype:
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description:
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- SELinux type for the specified target.
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required: yes
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seuser:
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description:
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- SELinux user for the specified target.
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selevel:
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description:
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- SELinux range for the specified target.
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aliases: [ serange ]
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state:
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description:
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- Desired boolean value.
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choices: [ absent, present ]
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default: present
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reload:
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description:
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- Reload SELinux policy after commit.
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type: bool
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default: 'yes'
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notes:
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- The changes are persistent across reboots
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- The M(sefcontext) module does not modify existing files to the new
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SELinux context(s), so it is advisable to first create the SELinux
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file contexts before creating files, or run C(restorecon) manually
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for the existing files that require the new SELinux file contexts.
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requirements:
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- libselinux-python
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- policycoreutils-python
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author:
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- Dag Wieers (@dagwieers)
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'''
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EXAMPLES = r'''
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# Allow apache to modify files in /srv/git_repos
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- sefcontext:
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target: '/srv/git_repos(/.*)?'
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setype: httpd_git_rw_content_t
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state: present
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'''
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RETURN = r'''
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# Default return values
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'''
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from ansible.module_utils.basic import AnsibleModule
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from ansible.module_utils.pycompat24 import get_exception
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from ansible.module_utils._text import to_native
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try:
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import selinux
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HAVE_SELINUX = True
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except ImportError:
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HAVE_SELINUX = False
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try:
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import seobject
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HAVE_SEOBJECT = True
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except ImportError:
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HAVE_SEOBJECT = False
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# Add missing entries (backward compatible)
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if HAVE_SEOBJECT:
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seobject.file_types.update(dict(
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a=seobject.SEMANAGE_FCONTEXT_ALL,
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b=seobject.SEMANAGE_FCONTEXT_BLOCK,
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c=seobject.SEMANAGE_FCONTEXT_CHAR,
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d=seobject.SEMANAGE_FCONTEXT_DIR,
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f=seobject.SEMANAGE_FCONTEXT_REG,
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l=seobject.SEMANAGE_FCONTEXT_LINK,
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p=seobject.SEMANAGE_FCONTEXT_PIPE,
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s=seobject.SEMANAGE_FCONTEXT_SOCK,
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))
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# Make backward compatible
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option_to_file_type_str = dict(
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a='all files',
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b='block device',
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c='character device',
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d='directory',
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f='regular file',
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l='symbolic link',
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p='named pipe',
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s='socket file',
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)
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def semanage_fcontext_exists(sefcontext, target, ftype):
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''' Get the SELinux file context mapping definition from policy. Return None if it does not exist. '''
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# Beware that records comprise of a string representation of the file_type
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record = (target, option_to_file_type_str[ftype])
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records = sefcontext.get_all()
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try:
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return records[record]
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except KeyError:
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return None
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def semanage_fcontext_modify(module, result, target, ftype, setype, do_reload, serange, seuser, sestore=''):
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''' Add or modify SELinux file context mapping definition to the policy. '''
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changed = False
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prepared_diff = ''
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try:
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sefcontext = seobject.fcontextRecords(sestore)
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sefcontext.set_reload(do_reload)
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exists = semanage_fcontext_exists(sefcontext, target, ftype)
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if exists:
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# Modify existing entry
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orig_seuser, orig_serole, orig_setype, orig_serange = exists
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if seuser is None:
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seuser = orig_seuser
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if serange is None:
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serange = orig_serange
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if setype != orig_setype or seuser != orig_seuser or serange != orig_serange:
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if not module.check_mode:
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sefcontext.modify(target, setype, ftype, serange, seuser)
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changed = True
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if module._diff:
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prepared_diff += '# Change to semanage file context mappings\n'
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prepared_diff += '-%s %s %s:%s:%s:%s\n' % (target, ftype, orig_seuser, orig_serole, orig_setype, orig_serange)
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prepared_diff += '+%s %s %s:%s:%s:%s\n' % (target, ftype, seuser, orig_serole, setype, serange)
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else:
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# Add missing entry
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if seuser is None:
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seuser = 'system_u'
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if serange is None:
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serange = 's0'
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if not module.check_mode:
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sefcontext.add(target, setype, ftype, serange, seuser)
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changed = True
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if module._diff:
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prepared_diff += '# Addition to semanage file context mappings\n'
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prepared_diff += '+%s %s %s:%s:%s:%s\n' % (target, ftype, seuser, 'object_r', setype, serange)
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except Exception:
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e = get_exception()
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module.fail_json(msg="%s: %s\n" % (e.__class__.__name__, to_native(e)))
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if module._diff and prepared_diff:
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result['diff'] = dict(prepared=prepared_diff)
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module.exit_json(changed=changed, seuser=seuser, serange=serange, **result)
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def semanage_fcontext_delete(module, result, target, ftype, do_reload, sestore=''):
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''' Delete SELinux file context mapping definition from the policy. '''
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changed = False
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prepared_diff = ''
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try:
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sefcontext = seobject.fcontextRecords(sestore)
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sefcontext.set_reload(do_reload)
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exists = semanage_fcontext_exists(sefcontext, target, ftype)
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if exists:
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# Remove existing entry
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orig_seuser, orig_serole, orig_setype, orig_serange = exists
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if not module.check_mode:
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sefcontext.delete(target, ftype)
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changed = True
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if module._diff:
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prepared_diff += '# Deletion to semanage file context mappings\n'
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prepared_diff += '-%s %s %s:%s:%s:%s\n' % (target, ftype, exists[0], exists[1], exists[2], exists[3])
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except Exception:
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e = get_exception()
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module.fail_json(msg="%s: %s\n" % (e.__class__.__name__, to_native(e)))
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if module._diff and prepared_diff:
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result['diff'] = dict(prepared=prepared_diff)
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module.exit_json(changed=changed, **result)
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def main():
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module = AnsibleModule(
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argument_spec=dict(
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target=dict(required=True, aliases=['path']),
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ftype=dict(type='str', default='a', choices=option_to_file_type_str.keys()),
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setype=dict(type='str', required=True),
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seuser=dict(type='str'),
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selevel=dict(type='str', aliases=['serange']),
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state=dict(type='str', default='present', choices=['absent', 'present']),
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reload=dict(type='bool', default=True),
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),
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supports_check_mode=True,
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)
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if not HAVE_SELINUX:
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module.fail_json(msg="This module requires libselinux-python")
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if not HAVE_SEOBJECT:
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module.fail_json(msg="This module requires policycoreutils-python")
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if not selinux.is_selinux_enabled():
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module.fail_json(msg="SELinux is disabled on this host.")
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target = module.params['target']
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ftype = module.params['ftype']
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setype = module.params['setype']
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seuser = module.params['seuser']
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serange = module.params['selevel']
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state = module.params['state']
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do_reload = module.params['reload']
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result = dict(target=target, ftype=ftype, setype=setype, state=state)
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if state == 'present':
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semanage_fcontext_modify(module, result, target, ftype, setype, do_reload, serange, seuser)
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elif state == 'absent':
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semanage_fcontext_delete(module, result, target, ftype, do_reload)
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else:
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module.fail_json(msg='Invalid value of argument "state": {0}'.format(state))
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if __name__ == '__main__':
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main()
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