From 85710cee8fe970cab1699f781df876761bd3cd3c Mon Sep 17 00:00:00 2001
From: sarthurdev <965089+sarthurdev@users.noreply.github.com>
Date: Thu, 12 Aug 2021 00:56:41 +0200
Subject: firewall: T2199: Migrate firewall op-mode to XML/Python

---
 src/op_mode/firewall.py | 355 ++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 355 insertions(+)
 create mode 100755 src/op_mode/firewall.py

(limited to 'src')

diff --git a/src/op_mode/firewall.py b/src/op_mode/firewall.py
new file mode 100755
index 000000000..cf70890a6
--- /dev/null
+++ b/src/op_mode/firewall.py
@@ -0,0 +1,355 @@
+#!/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 argparse
+import json
+import re
+import tabulate
+
+from vyos.config import Config
+from vyos.util import cmd
+from vyos.util import dict_search_args
+
+def get_firewall_interfaces(conf, firewall, name=None, ipv6=False):
+    interfaces = conf.get_config_dict(['interfaces'], key_mangling=('-', '_'),
+                                      get_first_key=True, no_tag_node_value_mangle=True)
+
+    directions = ['in', 'out', 'local']
+
+    def parse_if(ifname, if_conf):
+        if 'firewall' in if_conf:
+            for direction in directions:
+                if direction in if_conf['firewall']:
+                    fw_conf = if_conf['firewall'][direction]
+                    name_str = f'({ifname},{direction})'
+
+                    if 'name' in fw_conf:
+                        fw_name = fw_conf['name']
+
+                        if not name:
+                            firewall['name'][fw_name]['interface'].append(name_str)
+                        elif not ipv6 and name == fw_name:
+                            firewall['interface'].append(name_str)
+
+                    if 'ipv6_name' in fw_conf:
+                        fw_name = fw_conf['ipv6_name']
+
+                        if not name:
+                            firewall['ipv6_name'][fw_name]['interface'].append(name_str)
+                        elif ipv6 and name == fw_name:
+                            firewall['interface'].append(name_str)
+
+        for iftype in ['vif', 'vif_s', 'vif_c']:
+            if iftype in if_conf:
+                for vifname, vif_conf in if_conf[iftype].items():
+                    parse_if(f'{ifname}.{vifname}', vif_conf)
+
+    for iftype, iftype_conf in interfaces.items():
+        for ifname, if_conf in iftype_conf.items():
+            parse_if(ifname, if_conf)
+
+    return firewall
+
+def get_config_firewall(conf, name=None, ipv6=False, interfaces=True):
+    config_path = ['firewall']
+    if name:
+        config_path += ['ipv6-name' if ipv6 else 'name', name]
+
+    firewall = conf.get_config_dict(config_path, key_mangling=('-', '_'),
+                                get_first_key=True, no_tag_node_value_mangle=True)
+    if firewall and interfaces:
+        if name:
+            firewall['interface'] = []
+        else:
+            if 'name' in firewall:
+                for fw_name, name_conf in firewall['name'].items():
+                    name_conf['interface'] = []
+
+            if 'ipv6_name' in firewall:
+                for fw_name, name_conf in firewall['ipv6_name'].items():
+                    name_conf['interface'] = []
+
+        get_firewall_interfaces(conf, firewall, name, ipv6)
+    return firewall
+
+def get_nftables_details(name, ipv6=False):
+    suffix = '6' if ipv6 else ''
+    command = f'sudo nft list chain ip{suffix} filter {name}'
+    try:
+        results = cmd(command)
+    except:
+        return {}
+
+    out = {}
+    for line in results.split('\n'):
+        comment_search = re.search(rf'{name}[\- ](\d+|default-action)', line)
+        if not comment_search:
+            continue
+
+        rule = {}
+        rule_id = comment_search[1]
+        counter_search = re.search(r'counter packets (\d+) bytes (\d+)', line)
+        if counter_search:
+            rule['packets'] = counter_search[1]
+            rule['bytes'] = counter_search[2]
+
+        rule['conditions'] = re.sub(r'(\b(counter packets \d+ bytes \d+|drop|reject|return|log)\b|comment "[\w\-]+")', '', line).strip()
+        out[rule_id] = rule
+    return out
+
+def output_firewall_name(name, name_conf, ipv6=False, single_rule_id=None):
+    ip_str = 'IPv6' if ipv6 else 'IPv4'
+    print(f'\n---------------------------------\n{ip_str} Firewall "{name}"\n')
+
+    if name_conf['interface']:
+        print('Active on: {0}\n'.format(" ".join(name_conf['interface'])))
+
+    details = get_nftables_details(name, ipv6)
+    rows = []
+
+    if 'rule' in name_conf:
+        for rule_id, rule_conf in name_conf['rule'].items():
+            if single_rule_id and rule_id != single_rule_id:
+                continue
+
+            if 'disable' in rule_conf:
+                continue
+
+            row = [rule_id, rule_conf['action'], rule_conf['protocol'] if 'protocol' in rule_conf else 'all']
+            if rule_id in details:
+                rule_details = details[rule_id]
+                row.append(rule_details.get('packets', 0))
+                row.append(rule_details.get('bytes', 0))
+                row.append(rule_details['conditions'])
+            rows.append(row)
+
+    if 'default_action' in name_conf and not single_rule_id:
+        row = ['default', name_conf['default_action'], 'all']
+        if 'default-action' in details:
+            rule_details = details['default-action']
+            row.append(rule_details.get('packets', 0))
+            row.append(rule_details.get('bytes', 0))
+        rows.append(row)
+
+    if rows:
+        header = ['Rule', 'Action', 'Protocol', 'Packets', 'Bytes', 'Conditions']
+        print(tabulate.tabulate(rows, header) + '\n')
+
+def output_firewall_name_statistics(name, name_conf, ipv6=False, single_rule_id=None):
+    ip_str = 'IPv6' if ipv6 else 'IPv4'
+    print(f'\n---------------------------------\n{ip_str} Firewall "{name}"\n')
+
+    if name_conf['interface']:
+        print('Active on: {0}\n'.format(" ".join(name_conf['interface'])))
+
+    details = get_nftables_details(name, ipv6)
+    rows = []
+
+    if 'rule' in name_conf:
+        for rule_id, rule_conf in name_conf['rule'].items():
+            if single_rule_id and rule_id != single_rule_id:
+                continue
+
+            if 'disable' in rule_conf:
+                continue
+
+            source_addr = dict_search_args(rule_conf, 'source', 'address') or '0.0.0.0/0'
+            dest_addr = dict_search_args(rule_conf, 'destination', 'address') or '0.0.0.0/0'
+
+            row = [rule_id]
+            if rule_id in details:
+                rule_details = details[rule_id]
+                row.append(rule_details.get('packets', 0))
+                row.append(rule_details.get('bytes', 0))
+            else:
+                row.append('0')
+                row.append('0')
+            row.append(rule_conf['action'])
+            row.append(source_addr)
+            row.append(dest_addr)
+            rows.append(row)
+
+    if 'default_action' in name_conf and not single_rule_id:
+        row = ['default']
+        if 'default-action' in details:
+            rule_details = details['default-action']
+            row.append(rule_details.get('packets', 0))
+            row.append(rule_details.get('bytes', 0))
+        else:
+            row.append('0')
+            row.append('0')
+        row.append(name_conf['default_action'])
+        row.append('0.0.0.0/0') # Source
+        row.append('0.0.0.0/0') # Dest
+        rows.append(row)
+
+    if rows:
+        header = ['Rule', 'Packets', 'Bytes', 'Action', 'Source', 'Destination']
+        print(tabulate.tabulate(rows, header) + '\n')
+
+def show_firewall():
+    print('Rulesets Information')
+
+    conf = Config()
+    firewall = get_config_firewall(conf)
+
+    if not firewall:
+        return
+
+    if 'name' in firewall:
+        for name, name_conf in firewall['name'].items():
+            output_firewall_name(name, name_conf, ipv6=False)
+
+    if 'ipv6_name' in firewall:
+        for name, name_conf in firewall['ipv6_name'].items():
+            output_firewall_name(name, name_conf, ipv6=True)
+
+def show_firewall_name(name, ipv6=False):
+    print('Ruleset Information')
+
+    conf = Config()
+    firewall = get_config_firewall(conf, name, ipv6)
+    if firewall:
+        output_firewall_name(name, firewall, ipv6)
+
+def show_firewall_rule(name, rule_id, ipv6=False):
+    print('Rule Information')
+
+    conf = Config()
+    firewall = get_config_firewall(conf, name, ipv6)
+    if firewall:
+        output_firewall_name(name, firewall, ipv6, rule_id)
+
+def show_firewall_group(name=None):
+    conf = Config()
+    firewall = get_config_firewall(conf, interfaces=False)
+
+    if 'group' not in firewall:
+        return
+
+    def find_references(group_type, group_name):
+        out = []
+        for name_type in ['name', 'ipv6_name']:
+            if name_type not in firewall:
+                continue
+            for name, name_conf in firewall[name_type].items():
+                if 'rule' not in name_conf:
+                    continue
+                for rule_id, rule_conf in name_conf['rule'].items():
+                    source_group = dict_search_args(rule_conf, 'source', 'group', group_type)
+                    dest_group = dict_search_args(rule_conf, 'destination', 'group', group_type)
+                    if source_group and group_name == source_group:
+                        out.append(f'{name}-{rule_id}')
+                    elif dest_group and group_name == dest_group:
+                        out.append(f'{name}-{rule_id}')
+        return out
+
+    header = ['Name', 'Type', 'References', 'Members']
+    rows = []
+
+    for group_type, group_type_conf in firewall['group'].items():
+        for group_name, group_conf in group_type_conf.items():
+            if name and name != group_name:
+                continue
+
+            references = find_references(group_type, group_name)
+            row = [group_name, group_type, ', '.join(references)]
+            if 'address' in group_conf:
+                row.append(", ".join(group_conf['address']))
+            elif 'network' in group_conf:
+                row.append(", ".join(group_conf['network']))
+            elif 'port' in group_conf:
+                row.append(", ".join(group_conf['port']))
+            rows.append(row)
+
+    if rows:
+        print('Firewall Groups\n')
+        print(tabulate.tabulate(rows, header))
+
+def show_summary():
+    print('Ruleset Summary')
+
+    conf = Config()
+    firewall = get_config_firewall(conf)
+
+    if not firewall:
+        return
+
+    header = ['Ruleset Name', 'Description', 'References']
+    v4_out = []
+    v6_out = []
+
+    if 'name' in firewall:
+        for name, name_conf in firewall['name'].items():
+            description = name_conf.get('description', '')
+            interfaces = ", ".join(name_conf['interface'])
+            v4_out.append([name, description, interfaces])
+
+    if 'ipv6_name' in firewall:
+        for name, name_conf in firewall['ipv6_name'].items():
+            description = name_conf.get('description', '')
+            interfaces = ", ".join(name_conf['interface'])
+            v6_out.append([name, description, interfaces])
+
+    if v6_out:
+        print('\nIPv6 name:\n')
+        print(tabulate.tabulate(v6_out, header) + '\n')
+
+    if v4_out:
+        print('\nIPv4 name:\n')
+        print(tabulate.tabulate(v4_out, header) + '\n')
+
+    show_firewall_group()
+
+def show_statistics():
+    print('Rulesets Statistics')
+
+    conf = Config()
+    firewall = get_config_firewall(conf)
+
+    if not firewall:
+        return
+
+    if 'name' in firewall:
+        for name, name_conf in firewall['name'].items():
+            output_firewall_name_statistics(name, name_conf, ipv6=False)
+
+    if 'ipv6_name' in firewall:
+        for name, name_conf in firewall['ipv6_name'].items():
+            output_firewall_name_statistics(name, name_conf, ipv6=True)
+
+if __name__ == '__main__':
+    parser = argparse.ArgumentParser()
+    parser.add_argument('--action', help='Action', required=False)
+    parser.add_argument('--name', help='Firewall name', required=False, action='store', nargs='?', default='')
+    parser.add_argument('--rule', help='Firewall Rule ID', required=False)
+    parser.add_argument('--ipv6', help='IPv6 toggle', action='store_true')
+
+    args = parser.parse_args()
+
+    if args.action == 'show':
+        if not args.rule:
+            show_firewall_name(args.name, args.ipv6)
+        else:
+            show_firewall_rule(args.name, args.rule, args.ipv6)
+    elif args.action == 'show_all':
+        show_firewall()
+    elif args.action == 'show_group':
+        show_firewall_group(args.name)
+    elif args.action == 'show_statistics':
+        show_statistics()
+    elif args.action == 'show_summary':
+        show_summary()
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