Create pam_limits.py

The pam_limits module modify PAM limits, default in /etc/security/limits.conf.
 For the full documentation, see man limits.conf(5).
pull/18777/head
Sebastien ROHAUT 10 years ago committed by Matt Clay
parent 8e3da4212b
commit c62430b452

@ -0,0 +1,222 @@
#!/usr/bin/python
# -*- coding: utf-8 -*-
# (c) 2014, Sebastien Rohaut <sebastien.rohaut@gmail.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/>.
import os
import os.path
import shutil
import re
DOCUMENTATION = '''
---
module: pam_limits
version_added: "historical"
short_description: Modify Linux PAM limits
description:
- The M(pam_limits) module modify PAM limits, default in /etc/security/limits.conf.
For the full documentation, see man limits.conf(5).
options:
domain:
description:
- A username, @groupname, wildcard, uid/gid range.
required: true
default: null
limit_type:
description:
- Limit type : hard or soft.
required: true
choices: [ "hard", "soft" ]
default: null
limit_item:
description:
- The limit to be set : core, data, nofile, cpu, etc.
required: true
choices: [ "core", "data", "fsize", "memlock", "nofile", "rss", "stack", "cpu", "nproc", "as", "maxlogins", "maxsyslogins", "priority", "locks", "sigpending", "msgqueue", "nice", "rtprio", "chroot" ]
default: null
value:
description:
- The value of the limit.
required: true
default: null
backup:
description:
- Create a backup file including the timestamp information so you can get
the original file back if you somehow clobbered it incorrectly.
required: false
choices: [ "yes", "no" ]
default: "no"
use_min:
description:
- If set to C(yes), the minimal value will be used or conserved.
If the specified value is inferior to the value in the file, file content is replaced with the new value,
else content is not modified.
required: false
choices: [ "yes", "no" ]
default: "no"
use_max:
description:
- If set to C(yes), the maximal value will be used or conserved.
If the specified value is superior to the value in the file, file content is replaced with the new value,
else content is not modified.
required: false
choices: [ "yes", "no" ]
default: "no"
dest:
description:
- Modify the limits.conf path.
required: false
default: "/etc/security/limits.conf"
'''
EXAMPLES = '''
# Add or modify limits for the user joe
- pam_limits: domain=joe limit_type=soft limit_item=nofile value=64000
# Add or modify limits for the user joe. Keep or set the maximal value
- pam_limits: domain=joe limit_type=soft limit_item=nofile value=1000000
'''
def main():
pam_items = [ 'core', 'data', 'fsize', 'memlock', 'nofile', 'rss', 'stack', 'cpu', 'nproc', 'as', 'maxlogins', 'maxsyslogins', 'priority', 'locks', 'sigpending', 'msgqueue', 'nice', 'rtprio', 'chroot' ]
pam_types = [ 'soft', 'hard' ]
limits_conf = '/home/slyce/limits.conf'
module = AnsibleModule(
# not checking because of daisy chain to file module
argument_spec = dict(
domain = dict(required=True, type='str'),
limit_type = dict(required=True, type='str', choices=pam_types),
limit_item = dict(required=True, type='str', choices=pam_items),
value = dict(required=True, type='int'),
use_max = dict(default=False, type='bool'),
use_min = dict(default=False, type='bool'),
backup = dict(default=False, type='bool'),
dest = dict(default=limits_conf, type='str')
)
)
domain = module.params['domain']
limit_type = module.params['limit_type']
limit_item = module.params['limit_item']
value = module.params['value']
use_max = module.params['use_max']
use_min = module.params['use_min']
backup = module.params['backup']
limits_conf = module.params['dest']
changed = False
if os.path.isfile(limits_conf):
if not os.access(limits_conf, os.W_OK):
module.fail_json(msg="%s is not writable. Use sudo" % (limits_conf) )
else:
module.fail_json(msg="%s is not visible (check presence, access rights, use sudo)" % (limits_conf) )
# Backup
if backup:
backup_file = module.backup_local(limits_conf)
space_pattern = re.compile(r'\s+')
message = ''
f = open (limits_conf, 'r')
# Tempfile
nf = tempfile.NamedTemporaryFile(delete = False)
found = False
new_value = value
for line in f:
if line.startswith('#'):
nf.write(line)
continue
newline = re.sub(space_pattern, ' ', line).strip()
if not newline:
nf.write(line)
continue
line_fields = newline.split(' ')
if len(line_fields) != 4:
nf.write(line)
continue
line_domain = line_fields[0]
line_type = line_fields[1]
line_item = line_fields[2]
actual_value = int(line_fields[3])
# Found the line
if line_domain == domain and line_type == limit_type and line_item == limit_item:
found = True
if value == actual_value:
message = line
nf.write(line)
continue
if use_max:
new_value = max(value, actual_value)
if use_min:
new_value = min(value,actual_value)
# Change line only if value has changed
if new_value != actual_value:
changed = True
new_limit = domain + "\t" + limit_type + "\t" + limit_item + "\t" + str(new_value) + "\n"
message = new_limit
nf.write(new_limit)
else:
message = line
nf.write(line)
else:
nf.write(line)
if not found:
changed = True
new_limit = domain + "\t" + limit_type + "\t" + limit_item + "\t" + str(new_value) + "\n"
message = new_limit
nf.write(new_limit)
f.close()
nf.close()
# Copy tempfile to newfile
shutil.copy(nf.name, f.name)
# delete tempfile
os.unlink(nf.name)
res_args = dict(
changed = changed, msg = message
)
if backup:
res_args['backup_file'] = backup_file
module.exit_json(**res_args)
# import module snippets
from ansible.module_utils.basic import *
main()
Loading…
Cancel
Save