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
|
#!/usr/bin/env python3
#
# Copyright (C) 2020 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 get_interface_dict
from vyos.ifconfig import MACsecIf
from vyos.ifconfig import Interface
from vyos.template import render
from vyos.util import call
from vyos.configverify import verify_vrf
from vyos.configverify import verify_address
from vyos.configverify import verify_bridge_delete
from vyos.configverify import verify_mtu_ipv6
from vyos.configverify import verify_source_interface
from vyos import ConfigError
from vyos import airbag
airbag.enable()
# XXX: wpa_supplicant works on the source interface
wpa_suppl_conf = '/run/wpa_supplicant/{source_interface}.conf'
def get_config(config=None):
"""
Retrive CLI config as dictionary. Dictionary can never be empty, as at least the
interface name will be added or a deleted flag
"""
if config:
conf = config
else:
conf = Config()
base = ['interfaces', 'macsec']
macsec = get_interface_dict(conf, base)
# MACsec is "special" the default MTU is 1460 - update accordingly
# as the config_level is already st in get_interface_dict() - we can use []
tmp = conf.get_config_dict([], key_mangling=('-', '_'), get_first_key=True)
if 'mtu' not in tmp:
# base MTU for MACsec is 1468 bytes, but we leave room for 802.1ad and
# 802.1q VLAN tags, thus the limit is 1460 bytes.
macsec['mtu'] = '1460'
# Check if interface has been removed
if 'deleted' in macsec:
source_interface = conf.return_effective_value(
base + ['source-interface'])
macsec.update({'source_interface': source_interface})
return macsec
def verify(macsec):
if 'deleted' in macsec:
verify_bridge_delete(macsec)
return None
verify_source_interface(macsec)
verify_vrf(macsec)
verify_mtu_ipv6(macsec)
verify_address(macsec)
if not (('security' in macsec) and
('cipher' in macsec['security'])):
raise ConfigError(
'Cipher suite must be set for MACsec "{ifname}"'.format(**macsec))
if (('security' in macsec) and
('encrypt' in macsec['security'])):
tmp = macsec.get('security')
if not (('mka' in tmp) and
('cak' in tmp['mka']) and
('ckn' in tmp['mka'])):
raise ConfigError('Missing mandatory MACsec security '
'keys as encryption is enabled!')
if 'source_interface' in macsec:
# MACsec adds a 40 byte overhead (32 byte MACsec + 8 bytes VLAN 802.1ad
# and 802.1q) - we need to check the underlaying MTU if our configured
# MTU is at least 40 bytes less then the MTU of our physical interface.
lower_mtu = Interface(macsec['source_interface']).get_mtu()
if lower_mtu < (int(macsec['mtu']) + 40):
raise ConfigError('MACsec overhead does not fit into underlaying device MTU,\n' \
f'{underlay_mtu} bytes is too small!')
return None
def generate(macsec):
render(wpa_suppl_conf.format(**macsec),
'macsec/wpa_supplicant.conf.tmpl', macsec)
return None
def apply(macsec):
# Remove macsec interface
if 'deleted' in macsec.keys():
call('systemctl stop wpa_supplicant-macsec@{source_interface}'
.format(**macsec))
MACsecIf(macsec['ifname']).remove()
# delete configuration on interface removal
if os.path.isfile(wpa_suppl_conf.format(**macsec)):
os.unlink(wpa_suppl_conf.format(**macsec))
else:
# This is a special type of interface which needs additional parameters
# when created using iproute2. Instead of passing a ton of arguments,
# use a dictionary provided by the interface class which holds all the
# options necessary.
conf = MACsecIf.get_config()
conf['source_interface'] = macsec['source_interface']
conf['security_cipher'] = macsec['security']['cipher']
# It is safe to "re-create" the interface always, there is a sanity
# check that the interface will only be create if its non existent
i = MACsecIf(macsec['ifname'], **conf)
i.update(macsec)
call('systemctl restart wpa_supplicant-macsec@{source_interface}'
.format(**macsec))
return None
if __name__ == '__main__':
try:
c = get_config()
verify(c)
generate(c)
apply(c)
except ConfigError as e:
print(e)
exit(1)
|
