upnpd: T3420: Implement features

1 files changed, 155 insertions, 0 deletions

diff --git a/src/conf_mode/service_upnp.py b/src/conf_mode/service_upnp.py
new file mode 100755
index 000000000..8bf6f43b4
--- /dev/null
+++ b/src/conf_mode/service_upnp.py
@@ -0,0 +1,155 @@
+#!/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
+import uuid
+import netifaces
+from ipaddress import IPv4Network
+from ipaddress import IPv6Network
+
+from vyos.config import Config
+from vyos.configdict import dict_merge
+from vyos.configdict import dict_search
+from vyos.configdict import get_interface_dict
+from vyos.configverify import verify_vrf
+from vyos.util import call
+from vyos.template import render
+from vyos.template import is_ipv4
+from vyos.template import is_ipv6
+from vyos.xml import defaults
+from vyos import ConfigError
+from vyos import airbag
+airbag.enable()
+
+config_file = r'/run/upnp/miniupnp.conf'
+
+def get_config(config=None):
+    if config:
+        conf = config
+    else:
+        conf = Config()
+    base = ['service', 'upnp']
+    upnpd = conf.get_config_dict(base, key_mangling=('-', '_'), get_first_key=True)
+    
+    if not upnpd:
+        return None
+    
+    if dict_search('rule', upnpd):
+        default_member_values = defaults(base + ['rule'])
+        for rule,rule_config in upnpd['rule'].items():
+            upnpd['rule'][rule] = dict_merge(default_member_values, upnpd['rule'][rule])
+    
+    uuidgen = uuid.uuid1()
+    upnpd.update({'uuid': uuidgen})
+
+    return upnpd
+
+def get_all_interface_addr(prefix, filter_dev, filter_family):
+    list_addr = []
+    interfaces = netifaces.interfaces()
+    
+    for interface in interfaces:
+        if filter_dev and interface in filter_dev:
+            continue
+        addrs = netifaces.ifaddresses(interface)
+        if netifaces.AF_INET in addrs.keys():
+            if netifaces.AF_INET in filter_family:
+                for addr in addrs[netifaces.AF_INET]:
+                    if prefix:
+                        # we need to manually assemble a list of IPv4 address/prefix
+                        prefix = '/' + \
+                            str(IPv4Network('0.0.0.0/' + addr['netmask']).prefixlen)
+                        list_addr.append(addr['addr'] + prefix)
+                    else:
+                        list_addr.append(addr['addr'])
+        if netifaces.AF_INET6 in addrs.keys():
+            if netifaces.AF_INET6 in filter_family:
+                for addr in addrs[netifaces.AF_INET6]:
+                    if prefix:
+                        # we need to manually assemble a list of IPv4 address/prefix
+                        bits = bin(int(addr['netmask'].replace(':', ''), 16)).count('1')
+                        prefix = '/' + str(bits)
+                        list_addr.append(addr['addr'] + prefix)
+                    else:
+                        list_addr.append(addr['addr'])
+    
+    return list_addr
+
+def verify(upnpd):
+    if not upnpd:
+        return None
+    
+    if 'wan_interface' not in upnpd:
+        raise ConfigError('To enable UPNP, you must have the "wan-interface" option!')
+    
+    if dict_search('rules', upnpd):
+        for rule,rule_config in upnpd['rule'].items():
+            for option in ['external_port_range', 'internal_port_range', 'ip', 'action']:
+                if option not in rule_config:
+                    raise ConfigError(f'A UPNP rule must have an "{option}" option!')
+    
+    if dict_search('stun', upnpd):
+        for option in ['host', 'port']:
+            if option not in upnpd['stun']:
+                raise ConfigError(f'A UPNP stun support must have an "{option}" option!')
+    
+    # Check the validity of the IP address
+    listen_dev = []
+    system_addrs_cidr = get_all_interface_addr(True, [], [netifaces.AF_INET, netifaces.AF_INET6])
+    system_addrs = get_all_interface_addr(False, [], [netifaces.AF_INET, netifaces.AF_INET6])
+    for listen_if_or_addr in upnpd['listen']:
+        if listen_if_or_addr not in netifaces.interfaces():
+            listen_dev.append(listen_if_or_addr)
+        if (listen_if_or_addr not in system_addrs) and (listen_if_or_addr not in system_addrs_cidr) and (listen_if_or_addr not in netifaces.interfaces()):
+            if is_ipv4(listen_if_or_addr) and IPv4Network(listen_if_or_addr).is_multicast:
+                raise ConfigError(f'The address "{listen_if_or_addr}" is an address that is not allowed to listen on. It is not an interface address nor a multicast address!')
+            if is_ipv6(listen_if_or_addr) and IPv6Network(listen_if_or_addr).is_multicast:
+                raise ConfigError(f'The address "{listen_if_or_addr}" is an address that is not allowed to listen on. It is not an interface address nor a multicast address!')
+    
+    system_listening_dev_addrs_cidr = get_all_interface_addr(True, listen_dev, [netifaces.AF_INET6])
+    system_listening_dev_addrs = get_all_interface_addr(False, listen_dev, [netifaces.AF_INET6])
+    for listen_if_or_addr in upnpd['listen']:
+        if listen_if_or_addr not in netifaces.interfaces() and (listen_if_or_addr not in system_listening_dev_addrs_cidr) and (listen_if_or_addr not in system_listening_dev_addrs) and is_ipv6(listen_if_or_addr) and (not IPv6Network(listen_if_or_addr).is_multicast):
+            raise ConfigError(f'{listen_if_or_addr} must listen on the interface of the network card')
+
+def generate(upnpd):
+    if not upnpd:
+        return None
+    
+    if os.path.isfile(config_file):
+        os.unlink(config_file)
+    
+    render(config_file, 'firewall/upnpd.conf.tmpl', upnpd)
+
+def apply(upnpd):
+    if not upnpd:
+        # Stop the UPNP service
+        call('systemctl stop miniupnpd.service')
+    else:
+        # Start the UPNP service
+        call('systemctl restart miniupnpd.service')
+
+if __name__ == '__main__':
+    try:
+        c = get_config()
+        verify(c)
+        generate(c)
+        apply(c)
+    except ConfigError as e:
+        print(e)
+        exit(1)