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authorChristian Poessinger <christian@poessinger.com>2022-12-11 19:38:28 +0100
committerChristian Poessinger <christian@poessinger.com>2022-12-11 20:27:40 +0100
commitff56aeefddaad2d37d3ea32626e1adf3960eaf26 (patch)
treef43b289db8073adc10a67607d6e043c18acd764d /src/conf_mode/interfaces-sstpc.py
parent3296a10dc27d2fb1c79db07b26d62c8abb6a51bc (diff)
downloadvyos-1x-ff56aeefddaad2d37d3ea32626e1adf3960eaf26.tar.gz
vyos-1x-ff56aeefddaad2d37d3ea32626e1adf3960eaf26.zip
sstp: T4384: initial implementation of SSTP client CLI
vyos@vyos# show interfaces sstpc sstpc sstpc10 { authentication { password vyos user vyos } server sstp.vyos.net ssl { ca-certificate VyOS-CA } }
Diffstat (limited to 'src/conf_mode/interfaces-sstpc.py')
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diff --git a/src/conf_mode/interfaces-sstpc.py b/src/conf_mode/interfaces-sstpc.py
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+#!/usr/bin/env python3
+#
+# Copyright (C) 2022 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.configdict import is_node_changed
+from vyos.configverify import verify_authentication
+from vyos.configverify import verify_vrf
+from vyos.ifconfig import SSTPCIf
+from vyos.pki import encode_certificate
+from vyos.pki import find_chain
+from vyos.pki import load_certificate
+from vyos.template import render
+from vyos.util import call
+from vyos.util import dict_search
+from vyos.util import is_systemd_service_running
+from vyos.util import write_file
+from vyos import ConfigError
+from vyos import airbag
+airbag.enable()
+
+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', 'sstpc']
+ ifname, sstpc = get_interface_dict(conf, base)
+
+ # We should only terminate the SSTP client session if critical parameters
+ # change. All parameters that can be changed on-the-fly (like interface
+ # description) should not lead to a reconnect!
+ for options in ['authentication', 'no_peer_dns', 'no_default_route',
+ 'server', 'ssl']:
+ if is_node_changed(conf, base + [ifname, options]):
+ sstpc.update({'shutdown_required': {}})
+ # bail out early - no need to further process other nodes
+ break
+
+ # Load PKI certificates for later processing
+ sstpc['pki'] = conf.get_config_dict(['pki'], key_mangling=('-', '_'),
+ get_first_key=True,
+ no_tag_node_value_mangle=True)
+ return sstpc
+
+def verify(sstpc):
+ if 'deleted' in sstpc:
+ return None
+
+ verify_authentication(sstpc)
+ verify_vrf(sstpc)
+
+ if dict_search('ssl.ca_certificate', sstpc) == None:
+ raise ConfigError('Missing mandatory CA certificate!')
+
+ return None
+
+def generate(sstpc):
+ ifname = sstpc['ifname']
+ config_sstpc = f'/etc/ppp/peers/{ifname}'
+
+ sstpc['ca_file_path'] = f'/run/sstpc/{ifname}_ca-cert.pem'
+
+ if 'deleted' in sstpc:
+ for file in [sstpc['ca_file_path'], config_sstpc]:
+ if os.path.exists(file):
+ os.unlink(file)
+ return None
+
+ ca_name = sstpc['ssl']['ca_certificate']
+ pki_ca_cert = sstpc['pki']['ca'][ca_name]
+
+ loaded_ca_cert = load_certificate(pki_ca_cert['certificate'])
+ loaded_ca_certs = {load_certificate(c['certificate'])
+ for c in sstpc['pki']['ca'].values()} if 'ca' in sstpc['pki'] else {}
+
+ ca_full_chain = find_chain(loaded_ca_cert, loaded_ca_certs)
+
+ write_file(sstpc['ca_file_path'], '\n'.join(encode_certificate(c) for c in ca_full_chain))
+ render(config_sstpc, 'sstp-client/peer.j2', sstpc, permission=0o640)
+
+ return None
+
+def apply(sstpc):
+ ifname = sstpc['ifname']
+ if 'deleted' in sstpc or 'disable' in sstpc:
+ if os.path.isdir(f'/sys/class/net/{ifname}'):
+ p = SSTPCIf(ifname)
+ p.remove()
+ call(f'systemctl stop ppp@{ifname}.service')
+ return None
+
+ # reconnect should only be necessary when specific options change,
+ # like server, authentication ... (see get_config() for details)
+ if ((not is_systemd_service_running(f'ppp@{ifname}.service')) or
+ 'shutdown_required' in sstpc):
+
+ # cleanup system (e.g. FRR routes first)
+ if os.path.isdir(f'/sys/class/net/{ifname}'):
+ p = SSTPCIf(ifname)
+ p.remove()
+
+ call(f'systemctl restart ppp@{ifname}.service')
+ # When interface comes "live" a hook is called:
+ # /etc/ppp/ip-up.d/96-vyos-sstpc-callback
+ # which triggers SSTPCIf.update()
+ else:
+ if os.path.isdir(f'/sys/class/net/{ifname}'):
+ p = SSTPCIf(ifname)
+ p.update(sstpc)
+
+ return None
+
+if __name__ == '__main__':
+ try:
+ c = get_config()
+ verify(c)
+ generate(c)
+ apply(c)
+ except ConfigError as e:
+ print(e)
+ exit(1)