summaryrefslogtreecommitdiff
path: root/src/conf_mode/interfaces-macsec.py
blob: e59df6f903bf2aa00c9ff2971731cd4cec459624 (plain)
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
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
#!/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 copy import deepcopy
from sys import exit
from netifaces import interfaces

from vyos.config import Config
from vyos.configdict import list_diff
from vyos.ifconfig import MACsecIf, Interface
from vyos.template import render
from vyos.util import call
from vyos.validate import is_member
from vyos import ConfigError

default_config_data = {
    'address': [],
    'address_remove': [],
    'deleted': False,
    'description': '',
    'disable': False,
    'security_cipher': '',
    'security_encrypt': False,
    'security_key_cak': '',
    'security_key_ckn': '',
    'intf': '',
    'source_interface': '',
    'is_bridge_member': False,
    'vrf': ''
}

def get_config():
    macsec = deepcopy(default_config_data)
    conf = Config()

    # determine tagNode instance
    if 'VYOS_TAGNODE_VALUE' not in os.environ:
        raise ConfigError('Interface (VYOS_TAGNODE_VALUE) not specified')

    macsec['intf'] = os.environ['VYOS_TAGNODE_VALUE']
    base_path = ['interfaces', 'macsec', macsec['intf']]

    # check if we are a member of any bridge
    macsec['is_bridge_member'] = is_member(conf, macsec['intf'], 'bridge')

    # Check if interface has been removed
    if not conf.exists(base_path):
        macsec['deleted'] = True
        return macsec

    # set new configuration level
    conf.set_level(base_path)

    # retrieve configured interface addresses
    if conf.exists(['address']):
        macsec['address'] = conf.return_values(['address'])

    # retrieve interface description
    if conf.exists(['description']):
        macsec['description'] = conf.return_value(['description'])

    # Disable this interface
    if conf.exists(['disable']):
        macsec['disable'] = True

    # retrieve interface cipher
    if conf.exists(['security', 'cipher']):
        macsec['security_cipher'] = conf.return_value(['security', 'cipher'])

    # Enable optional MACsec encryption
    if conf.exists(['security', 'encrypt']):
        macsec['security_encrypt'] = True

    # Secure Connectivity Association Key
    if conf.exists(['security', 'key', 'cak']):
        macsec['security_key_cak'] = conf.return_value(['security', 'key', 'cak'])

    # Secure Connectivity Association Name
    if conf.exists(['security', 'key', 'ckn']):
        macsec['security_key_ckn'] = conf.return_value(['security', 'key', 'ckn'])

    # Physical interface
    if conf.exists(['source-interface']):
        macsec['source_interface'] = conf.return_value(['source-interface'])

    # Determine interface addresses (currently effective) - to determine which
    # address is no longer valid and needs to be removed from the interface
    eff_addr = conf.return_effective_values(['address'])
    act_addr = conf.return_values(['address'])
    macsec['address_remove'] = list_diff(eff_addr, act_addr)

    # retrieve VRF instance
    if conf.exists(['vrf']):
        macsec['vrf'] = conf.return_value(['vrf'])

    return macsec

def verify(macsec):
    if macsec['deleted']:
        if macsec['is_bridge_member']:
            raise ConfigError((
                f'Interface "{macsec["intf"]}" cannot be deleted as it is a '
                f'member of bridge "{macsec["is_bridge_member"]}"!'))

        return None

    if not macsec['source_interface']:
        raise ConfigError((
            f'Physical source interface must be set for MACsec "{macsec["intf"]}"'))

    if not macsec['security_cipher']:
        raise ConfigError((
            f'Cipher suite is mandatory for MACsec "{macsec["intf"]}"'))

    if macsec['vrf']:
        if macsec['vrf'] not in interfaces():
            raise ConfigError(f'VRF "{macsec["vrf"]}" does not exist')

        if macsec['is_bridge_member']:
            raise ConfigError((
                f'Interface "{macsec["intf"]}" cannot be member of VRF '
                f'"{macsec["vrf"]}" and bridge "{macsec["is_bridge_member"]}" '
                f'at the same time!'))

    if macsec['is_bridge_member'] and macsec['address']:
        raise ConfigError((
            f'Cannot assign address to interface "{macsec["intf"]}" '
            f'as it is a member of bridge "{macsec["is_bridge_member"]}"!'))

    return None

def generate(macsec):
    # XXX: wpa_supplicant works on the source interface not the resulting
    #      MACsec interface
    conf = f'/run/wpa_supplicant/wpa_supplicant-{macsec["source_interface"]}.conf'
    render(conf, 'macsec/wpa_supplicant.conf.tmpl', macsec, permission=0o640)
    return None

def apply(macsec):
    # Remove macsec interface
    if macsec['deleted']:
        call(f'systemctl stop wpa_supplicant-@{macsec["intf"]}.service')
        MACsecIf(macsec['intf']).remove()

    else:
        # MACsec interfaces require a configuration when they are added using
        # iproute2. This static method will provide the configuration
        # dictionary used by this class.
        conf = deepcopy(MACsecIf.get_config())

        # Assign MACsec instance configuration parameters to config dict
        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['intf'], **conf)

        # update interface description used e.g. within SNMP
        i.set_alias(macsec['description'])

        # Configure interface address(es)
        # - not longer required addresses get removed first
        # - newly addresses will be added second
        for addr in macsec['address_remove']:
            i.del_addr(addr)
        for addr in macsec['address']:
            i.add_addr(addr)

        # assign/remove VRF (ONLY when not a member of a bridge,
        # otherwise 'nomaster' removes it from it)
        if not macsec['is_bridge_member']:
            i.set_vrf(macsec['vrf'])

        # Interface is administratively down by default, enable if desired
        if not macsec['disable']:
            i.set_admin_state('up')

        call(f'systemctl restart wpa_supplicant-macsec@{macsec["source_interface"]}.service')

    return None

if __name__ == '__main__':
    try:
        c = get_config()
        verify(c)
        generate(c)
        apply(c)
    except ConfigError as e:
        print(e)
        exit(1)