ipsec: T2816: IPSec python rework, includes DMVPN and VTI support

1 files changed, 206 insertions, 0 deletions

diff --git a/src/op_mode/vpn_ipsec.py b/src/op_mode/vpn_ipsec.py
new file mode 100755
index 000000000..434186abb
--- /dev/null
+++ b/src/op_mode/vpn_ipsec.py
@@ -0,0 +1,206 @@
+#!/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 base64
+import os
+import re
+import struct
+import sys
+import argparse
+from subprocess import TimeoutExpired
+
+from vyos.util import ask_yes_no, call, cmd, process_named_running
+from Crypto.PublicKey.RSA import importKey
+
+RSA_LOCAL_KEY_PATH = '/config/ipsec.d/rsa-keys/localhost.key'
+RSA_LOCAL_PUB_PATH = '/etc/ipsec.d/certs/localhost.pub'
+RSA_KEY_PATHS = ['/config/auth', '/config/ipsec.d/rsa-keys']
+
+X509_CONFIG_PATH = '/etc/ipsec.d/key-pair.template'
+X509_PATH = '/config/auth/'
+
+IPSEC_CONF = '/etc/ipsec.conf'
+SWANCTL_CONF = '/etc/swanctl.conf'
+
+def migrate_to_vyatta_key(path):
+    with open(path, 'r') as f:
+        key = importKey(f.read())
+        e = key.e.to_bytes((key.e.bit_length() + 7) // 8, 'big')
+        n = key.n.to_bytes((key.n.bit_length() + 7) // 8, 'big')
+        return '0s' + str(base64.b64encode(struct.pack('B', len(e)) + e + n), 'ascii')
+    return None
+
+def find_rsa_keys():
+    keys = []
+    for path in RSA_KEY_PATHS:
+        if not os.path.exists(path):
+            continue
+        for filename in os.listdir(path):
+            full_path = os.path.join(path, filename)
+            if os.path.isfile(full_path) and full_path.endswith(".key"):
+                keys.append(full_path)
+    return keys
+
+def show_rsa_keys():
+    for key_path in find_rsa_keys():
+        print('Private key: ' + os.path.basename(key_path))
+        print('Public key: ' + migrate_to_vyatta_key(key_path) + '\n')
+
+def generate_rsa_key(bits = 2192):
+    if (bits < 16 or bits > 4096) or bits % 16 != 0:
+        print('Invalid bit length')
+        return
+
+    if os.path.exists(RSA_LOCAL_KEY_PATH):
+        if not ask_yes_no("A local RSA key file already exists and will be overwritten. Continue?"):
+            return
+
+    print(f'Generating rsa-key to {RSA_LOCAL_KEY_PATH}')
+
+    directory = os.path.dirname(RSA_LOCAL_KEY_PATH)
+    call(f'sudo mkdir -p {directory}')
+    result = call(f'sudo /usr/bin/openssl genrsa -out {RSA_LOCAL_KEY_PATH} {bits}')
+
+    if result != 0:
+        print(f'Could not generate RSA key: {result}')
+        return
+
+    call(f'sudo /usr/bin/openssl rsa -inform PEM -in {RSA_LOCAL_KEY_PATH} -pubout -out {RSA_LOCAL_PUB_PATH}')
+
+    print('Your new local RSA key has been generated')
+    print('The public portion of the key is:\n')
+    print(migrate_to_vyatta_key(RSA_LOCAL_KEY_PATH))
+
+def generate_x509_pair(name):
+    if os.path.exists(X509_PATH + name):
+        if not ask_yes_no("A certificate request with this name already exists and will be overwritten. Continue?"):
+            return
+
+    result = os.system(f'openssl req -new -nodes -keyout {X509_PATH}{name}.key -out {X509_PATH}{name}.csr -config {X509_CONFIG_PATH}')
+    
+    if result != 0:
+        print(f'Could not generate x509 key-pair: {result}')
+        return
+
+    print('Private key and certificate request has been generated')
+    print(f'CSR: {X509_PATH}{name}.csr')
+    print(f'Private key: {X509_PATH}{name}.key')
+
+def get_peer_connections(peer, tunnel, return_all = False):
+    search = rf'^conn (peer-{peer}-(tunnel-[\d]+|vti))$'
+    matches = []
+    with open(IPSEC_CONF, 'r') as f:
+        for line in f.readlines():
+            result = re.match(search, line)
+            if result:
+                suffix = f'tunnel-{tunnel}' if tunnel.isnumeric() else tunnel
+                if return_all or (result[2] == suffix):
+                    matches.append(result[1])
+    return matches
+
+def reset_peer(peer, tunnel):
+    if not peer:
+        print('Invalid peer, aborting')
+        return
+
+    conns = get_peer_connections(peer, tunnel, return_all = (not tunnel or tunnel == 'all'))
+
+    if not conns:
+        print('Tunnel(s) not found, aborting')
+        return
+
+    result = True
+    for conn in conns:
+        try:
+            call(f'sudo /usr/sbin/ipsec down {conn}', timeout = 10)
+            call(f'sudo /usr/sbin/ipsec up {conn}', timeout = 10)
+        except TimeoutExpired as e:
+            print(f'Timed out while resetting {conn}')
+            result = False
+
+
+    print('Peer reset result: ' + ('success' if result else 'failed'))
+
+def get_profile_connection(profile, tunnel = None):
+    search = rf'(dmvpn-{profile}-[\w]+)' if tunnel == 'all' else rf'(dmvpn-{profile}-{tunnel})'
+    with open(SWANCTL_CONF, 'r') as f:
+        for line in f.readlines():
+            result = re.search(search, line)
+            if result:
+                return result[1]
+    return None
+
+def reset_profile(profile, tunnel):
+    if not profile:
+        print('Invalid profile, aborting')
+        return
+
+    if not tunnel:
+        print('Invalid tunnel, aborting')
+        return
+
+    conn = get_profile_connection(profile)
+
+    if not conn:
+        print('Profile not found, aborting')
+        return
+
+    call(f'sudo /usr/sbin/ipsec down {conn}')
+    result = call(f'sudo /usr/sbin/ipsec up {conn}')
+
+    print('Profile reset result: ' + ('success' if result == 0 else 'failed'))
+
+def debug_peer(peer, tunnel):
+    if not peer or peer == "all":
+        call('sudo /usr/sbin/ipsec statusall')
+        return
+
+    if not tunnel or tunnel == 'all':
+        tunnel = ''
+
+    conn = get_peer_connection(peer, tunnel)
+
+    if not conn:
+        print('Peer not found, aborting')
+        return
+
+    call(f'sudo /usr/sbin/ipsec statusall | grep {conn}')
+
+if __name__ == '__main__':
+    parser = argparse.ArgumentParser()
+    parser.add_argument('--action', help='Control action', required=True)
+    parser.add_argument('--bits', help='Bits for rsa-key', required=False)
+    parser.add_argument('--name', help='Name for x509 key-pair, peer for reset', required=False)
+    parser.add_argument('--tunnel', help='Specific tunnel of peer', required=False)
+
+    args = parser.parse_args()
+
+    if args.action == 'rsa-key':
+        bits = int(args.bits) if args.bits else 2192
+        generate_rsa_key(bits)
+    elif args.action == 'rsa-key-show':
+        show_rsa_keys()
+    elif args.action == 'x509':
+        if not args.name:
+            print('Invalid name for key-pair, aborting.')
+            sys.exit(0)
+        generate_x509_pair(args.name)
+    elif args.action == 'reset-peer':
+        reset_peer(args.name, args.tunnel)
+    elif args.action == "reset-profile":
+        reset_profile(args.name, args.tunnel)
+    elif args.action == "vpn-debug":
+        debug_peer(args.name, args.tunnel)