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
|
#!/usr/bin/env python3
#
# Copyright (C) 2018 VyOS maintainers and contributors
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 2 or later as
# published by the Free Software Foundation.
#
# This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
#
#
import sys
import os
import jinja2
import ipaddress
import copy
from vyos.config import Config
from vyos import ConfigError
config_file = r'/etc/ntp.conf'
# Please be careful if you edit the template.
config_tmpl = """
### Autogenerated by ntp.py ###
#
# Non-configurable defaults
#
driftfile /var/lib/ntp/ntp.drift
# By default, only allow ntpd to query time sources, ignore any incoming requests
restrict default noquery nopeer notrap nomodify
# Local users have unrestricted access, allowing reconfiguration via ntpdc
restrict 127.0.0.1
restrict -6 ::1
#
# Configurable section
#
{% if servers -%}
{% for s in servers -%}
# Server configuration for: {{ s.name }}
server {{ s.name }} iburst {{ s.options | join(" ") }}
{% endfor -%}
{% endif %}
{% if allowed_networks -%}
{% for n in allowed_networks -%}
# Client configuration for network: {{ n.network }}
restrict {{ n.address }} mask {{ n.netmask }} nomodify notrap nopeer
{% endfor -%}
{% endif %}
{% if listen_address -%}
# NTP should listen on configured addresses only
interface ignore wildcard
{% for a in listen_address -%}
interface listen {{ a }}
{% endfor -%}
{% endif %}
"""
default_config_data = {
'servers': [],
'allowed_networks': [],
'listen_address': []
}
def get_config():
ntp = copy.deepcopy(default_config_data)
conf = Config()
if not conf.exists('system ntp'):
return None
else:
conf.set_level('system ntp')
if conf.exists('allow-clients address'):
networks = conf.return_values('allow-clients address')
for n in networks:
addr = ipaddress.ip_network(n)
net = {
"network" : n,
"address" : addr.network_address,
"netmask" : addr.netmask
}
ntp['allowed_networks'].append(net)
if conf.exists('listen-address'):
ntp['listen_address'] = conf.return_values('listen-address')
if conf.exists('server'):
for node in conf.list_nodes('server'):
options = []
server = {
"name": node,
"options": []
}
if conf.exists('server {0} noselect'.format(node)):
options.append('noselect')
if conf.exists('server {0} preempt'.format(node)):
options.append('preempt')
if conf.exists('server {0} prefer'.format(node)):
options.append('prefer')
server['options'] = options
ntp['servers'].append(server)
return ntp
def verify(ntp):
# bail out early - looks like removal from running config
if ntp is None:
return None
# Configuring allowed clients without a server makes no sense
if len(ntp['allowed_networks']) and not len(ntp['servers']):
raise ConfigError('NTP server not configured')
for n in ntp['allowed_networks']:
try:
addr = ipaddress.ip_network( n['network'] )
break
except ValueError:
raise ConfigError("{0} does not appear to be a valid IPv4 or IPv6 network, check host bits!".format(n['network']))
return None
def generate(ntp):
# bail out early - looks like removal from running config
if ntp is None:
return None
tmpl = jinja2.Template(config_tmpl)
config_text = tmpl.render(ntp)
with open(config_file, 'w') as f:
f.write(config_text)
return None
def apply(ntp):
if ntp is not None:
os.system('sudo systemctl restart ntp.service')
else:
# NTP support is removed in the commit
os.system('sudo systemctl stop ntp.service')
os.unlink(config_file)
return None
if __name__ == '__main__':
try:
c = get_config()
verify(c)
generate(c)
apply(c)
except ConfigError as e:
print(e)
sys.exit(1)
|
