1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
|
#!/usr/bin/python
# -*- coding: utf-8 -*-
# Copyright (c) 2014, Nate Coraor <nate@bx.psu.edu>
# GNU General Public License v3.0+ (see LICENSES/GPL-3.0-or-later.txt or https://www.gnu.org/licenses/gpl-3.0.txt)
# SPDX-License-Identifier: GPL-3.0-or-later
from __future__ import absolute_import, division, print_function
__metaclass__ = type
DOCUMENTATION = r'''
---
module: capabilities
short_description: Manage Linux capabilities
description:
- This module manipulates files privileges using the Linux capabilities(7) system.
extends_documentation_fragment:
- community.general.attributes
attributes:
check_mode:
support: full
diff_mode:
support: none
options:
path:
description:
- Specifies the path to the file to be managed.
type: str
required: true
aliases: [ key ]
capability:
description:
- Desired capability to set (with operator and flags, if O(state=present)) or remove (if O(state=absent))
type: str
required: true
aliases: [ cap ]
state:
description:
- Whether the entry should be present or absent in the file's capabilities.
type: str
choices: [ absent, present ]
default: present
notes:
- The capabilities system will automatically transform operators and flags into the effective set,
so for example, C(cap_foo=ep) will probably become C(cap_foo+ep).
- This module does not attempt to determine the final operator and flags to compare,
so you will want to ensure that your capabilities argument matches the final capabilities.
author:
- Nate Coraor (@natefoo)
'''
EXAMPLES = r'''
- name: Set cap_sys_chroot+ep on /foo
community.general.capabilities:
path: /foo
capability: cap_sys_chroot+ep
state: present
- name: Remove cap_net_bind_service from /bar
community.general.capabilities:
path: /bar
capability: cap_net_bind_service
state: absent
'''
from ansible.module_utils.basic import AnsibleModule
OPS = ('=', '-', '+')
class CapabilitiesModule(object):
platform = 'Linux'
distribution = None
def __init__(self, module):
self.module = module
self.path = module.params['path'].strip()
self.capability = module.params['capability'].strip().lower()
self.state = module.params['state']
self.getcap_cmd = module.get_bin_path('getcap', required=True)
self.setcap_cmd = module.get_bin_path('setcap', required=True)
self.capability_tup = self._parse_cap(self.capability, op_required=self.state == 'present')
self.run()
def run(self):
current = self.getcap(self.path)
caps = [cap[0] for cap in current]
if self.state == 'present' and self.capability_tup not in current:
# need to add capability
if self.module.check_mode:
self.module.exit_json(changed=True, msg='capabilities changed')
else:
# remove from current cap list if it's already set (but op/flags differ)
current = list(filter(lambda x: x[0] != self.capability_tup[0], current))
# add new cap with correct op/flags
current.append(self.capability_tup)
self.module.exit_json(changed=True, state=self.state, msg='capabilities changed', stdout=self.setcap(self.path, current))
elif self.state == 'absent' and self.capability_tup[0] in caps:
# need to remove capability
if self.module.check_mode:
self.module.exit_json(changed=True, msg='capabilities changed')
else:
# remove from current cap list and then set current list
current = filter(lambda x: x[0] != self.capability_tup[0], current)
self.module.exit_json(changed=True, state=self.state, msg='capabilities changed', stdout=self.setcap(self.path, current))
self.module.exit_json(changed=False, state=self.state)
def getcap(self, path):
rval = []
cmd = "%s -v %s" % (self.getcap_cmd, path)
rc, stdout, stderr = self.module.run_command(cmd)
# If file xattrs are set but no caps are set the output will be:
# '/foo ='
# If file xattrs are unset the output will be:
# '/foo'
# If the file does not exist, the stderr will be (with rc == 0...):
# '/foo (No such file or directory)'
if rc != 0 or stderr != "":
self.module.fail_json(msg="Unable to get capabilities of %s" % path, stdout=stdout.strip(), stderr=stderr)
if stdout.strip() != path:
if ' =' in stdout:
# process output of an older version of libcap
caps = stdout.split(' =')[1].strip().split()
else:
# otherwise, we have a newer version here
# see original commit message of cap/v0.2.40-18-g177cd41 in libcap.git
caps = stdout.split()[1].strip().split()
for cap in caps:
cap = cap.lower()
# getcap condenses capabilities with the same op/flags into a
# comma-separated list, so we have to parse that
if ',' in cap:
cap_group = cap.split(',')
cap_group[-1], op, flags = self._parse_cap(cap_group[-1])
for subcap in cap_group:
rval.append((subcap, op, flags))
else:
rval.append(self._parse_cap(cap))
return rval
def setcap(self, path, caps):
caps = ' '.join([''.join(cap) for cap in caps])
cmd = "%s '%s' %s" % (self.setcap_cmd, caps, path)
rc, stdout, stderr = self.module.run_command(cmd)
if rc != 0:
self.module.fail_json(msg="Unable to set capabilities of %s" % path, stdout=stdout, stderr=stderr)
else:
return stdout
def _parse_cap(self, cap, op_required=True):
opind = -1
try:
i = 0
while opind == -1:
opind = cap.find(OPS[i])
i += 1
except Exception:
if op_required:
self.module.fail_json(msg="Couldn't find operator (one of: %s)" % str(OPS))
else:
return (cap, None, None)
op = cap[opind]
cap, flags = cap.split(op)
return (cap, op, flags)
# ==============================================================
# main
def main():
# defining module
module = AnsibleModule(
argument_spec=dict(
path=dict(type='str', required=True, aliases=['key']),
capability=dict(type='str', required=True, aliases=['cap']),
state=dict(type='str', default='present', choices=['absent', 'present']),
),
supports_check_mode=True,
)
CapabilitiesModule(module)
if __name__ == '__main__':
main()
|
