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
|
#!/usr/bin/env python3
#
# Copyright (C) 2021 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 os
from sys import exit
from vyos.config import Config
from vyos.configdict import dict_merge
from vyos.util import cmd
from vyos.util import run
from vyos.util import process_named_running
from vyos.util import dict_search
from vyos.template import render
from vyos.xml import defaults
from vyos import ConfigError
from vyos import airbag
airbag.enable()
conntrack_config = r'/etc/modprobe.d/vyatta_nf_conntrack.conf'
sysctl_file = r'/run/sysctl/10-vyos-conntrack.conf'
# Every ALG (Application Layer Gateway) consists of either a Kernel Object
# also called a Kernel Module/Driver or some rules present in iptables
module_map = {
'ftp' : {
'ko' : ['nf_nat_ftp', 'nf_conntrack_ftp'],
},
'h323' : {
'ko' : ['nf_nat_h323', 'nf_conntrack_h323'],
},
'nfs' : {
'iptables' : ['VYATTA_CT_HELPER --table raw --proto tcp --dport 111 --jump CT --helper rpc',
'VYATTA_CT_HELPER --table raw --proto udp --dport 111 --jump CT --helper rpc'],
},
'pptp' : {
'ko' : ['nf_nat_pptp', 'nf_conntrack_pptp'],
},
'sip' : {
'ko' : ['nf_nat_sip', 'nf_conntrack_sip'],
},
'sqlnet' : {
'iptables' : ['VYATTA_CT_HELPER --table raw --proto tcp --dport 1521 --jump CT --helper tns',
'VYATTA_CT_HELPER --table raw --proto tcp --dport 1525 --jump CT --helper tns',
'VYATTA_CT_HELPER --table raw --proto tcp --dport 1536 --jump CT --helper tns'],
},
'tftp' : {
'ko' : ['nf_nat_tftp', 'nf_conntrack_tftp'],
},
}
def resync_conntrackd():
tmp = run('/usr/libexec/vyos/conf_mode/conntrack_sync.py')
if tmp > 0:
print('ERROR: error restarting conntrackd!')
def get_config(config=None):
if config:
conf = config
else:
conf = Config()
base = ['system', 'conntrack']
conntrack = conf.get_config_dict(base, key_mangling=('-', '_'),
get_first_key=True)
# We have gathered the dict representation of the CLI, but there are default
# options which we need to update into the dictionary retrived.
default_values = defaults(base)
conntrack = dict_merge(default_values, conntrack)
return conntrack
def verify(conntrack):
return None
def generate(conntrack):
render(conntrack_config, 'conntrack/vyos_nf_conntrack.conf.tmpl', conntrack)
render(sysctl_file, 'conntrack/sysctl.conf.tmpl', conntrack)
return None
def apply(conntrack):
# Depending on the enable/disable state of the ALG (Application Layer Gateway)
# modules we need to either insmod or rmmod the helpers.
for module, module_config in module_map.items():
if dict_search(f'modules.{module}', conntrack) is None:
if 'ko' in module_config:
for mod in module_config['ko']:
# Only remove the module if it's loaded
if os.path.exists(f'/sys/module/{mod}'):
cmd(f'rmmod {mod}')
if 'iptables' in module_config:
for rule in module_config['iptables']:
# Only install iptables rule if it does not exist
tmp = run(f'iptables --check {rule}')
if tmp == 0: cmd(f'iptables --delete {rule}')
else:
if 'ko' in module_config:
for mod in module_config['ko']:
cmd(f'modprobe {mod}')
if 'iptables' in module_config:
for rule in module_config['iptables']:
# Only install iptables rule if it does not exist
tmp = run(f'iptables --check {rule}')
if tmp > 0: cmd(f'iptables --insert {rule}')
if process_named_running('conntrackd'):
# Reload conntrack-sync daemon to fetch new sysctl values
resync_conntrackd()
# We silently ignore all errors
# See: https://bugzilla.redhat.com/show_bug.cgi?id=1264080
cmd(f'sysctl -f {sysctl_file}')
return None
if __name__ == '__main__':
try:
c = get_config()
verify(c)
generate(c)
apply(c)
except ConfigError as e:
print(e)
exit(1)
|
