Merge pull request #912 from sarthurdev/pki_ipsec_rsa

pki: T3642: Migrate rsa-keys to PKI configuration

1 files changed, 125 insertions, 0 deletions

diff --git a/src/migration-scripts/ipsec/7-to-8 b/src/migration-scripts/ipsec/7-to-8
new file mode 100755
index 000000000..5d48b2875
--- /dev/null
+++ b/src/migration-scripts/ipsec/7-to-8
@@ -0,0 +1,125 @@
+#!/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/>.
+
+# Migrate rsa keys into PKI configuration
+
+import base64
+import os
+import struct
+
+from cryptography.hazmat.primitives.asymmetric import rsa
+
+from sys import argv
+from sys import exit
+
+from vyos.configtree import ConfigTree
+from vyos.pki import load_public_key
+from vyos.pki import load_private_key
+from vyos.pki import encode_public_key
+from vyos.pki import encode_private_key
+
+if (len(argv) < 1):
+    print("Must specify file name!")
+    exit(1)
+
+file_name = argv[1]
+
+with open(file_name, 'r') as f:
+    config_file = f.read()
+
+pki_base = ['pki']
+ipsec_site_base = ['vpn', 'ipsec', 'site-to-site', 'peer']
+rsa_keys_base = ['vpn', 'rsa-keys']
+
+config = ConfigTree(config_file)
+
+LOCAL_KEY_PATHS = ['/config/auth/', '/config/ipsec.d/rsa-keys/']
+
+def migrate_from_vyatta_key(data):
+    data = base64.b64decode(data[2:])
+    length = struct.unpack('B', data[:1])[0]
+    e = int.from_bytes(data[1:1+length], 'big')
+    n = int.from_bytes(data[1+length:], 'big')
+    public_numbers = rsa.RSAPublicNumbers(e, n)
+    return public_numbers.public_key()
+
+def wrapped_pem_to_config_value(pem):
+    return "".join(pem.strip().split("\n")[1:-1])
+
+local_key_name = 'localhost'
+
+if config.exists(rsa_keys_base):
+    if not config.exists(pki_base + ['key-pair']):
+        config.set(pki_base + ['key-pair'])
+        config.set_tag(pki_base + ['key-pair'])
+
+    if config.exists(rsa_keys_base + ['local-key', 'file']):
+        local_file = config.return_value(rsa_keys_base + ['local-key', 'file'])
+        local_path = None
+        local_key = None
+
+        for path in LOCAL_KEY_PATHS:
+            full_path = os.path.join(path, local_file)
+            if os.path.exists(full_path):
+                local_path = full_path
+                break
+
+        if local_path:
+            with open(local_path, 'r') as f:
+                local_key_data = f.read()
+                local_key = load_private_key(local_key_data, wrap_tags=False)
+
+        if local_key:
+            local_key_pem = encode_private_key(local_key)
+            config.set(pki_base + ['key-pair', local_key_name, 'private', 'key'], value=wrapped_pem_to_config_value(local_key_pem))
+        else:
+            print('Failed to migrate local RSA key')
+
+    if config.exists(rsa_keys_base + ['rsa-key-name']):
+        for rsa_name in config.list_nodes(rsa_keys_base + ['rsa-key-name']):
+            if not config.exists(rsa_keys_base + ['rsa-key-name', rsa_name, 'rsa-key']):
+                continue
+
+            vyatta_key = config.return_value(rsa_keys_base + ['rsa-key-name', rsa_name, 'rsa-key'])
+            public_key = migrate_from_vyatta_key(vyatta_key)
+
+            if public_key:
+                public_key_pem = encode_public_key(public_key)
+                config.set(pki_base + ['key-pair', rsa_name, 'public', 'key'], value=wrapped_pem_to_config_value(public_key_pem))
+            else:
+                print(f'Failed to migrate rsa-key "{rsa_name}"')
+
+    config.delete(rsa_keys_base)
+
+if config.exists(ipsec_site_base):
+    for peer in config.list_nodes(ipsec_site_base):
+        mode = config.return_value(ipsec_site_base + [peer, 'authentication', 'mode'])
+
+        if mode != 'rsa':
+            continue
+
+        config.set(ipsec_site_base + [peer, 'authentication', 'rsa', 'local-key'], value=local_key_name)
+
+        remote_key_name = config.return_value(ipsec_site_base + [peer, 'authentication', 'rsa-key-name'])
+        config.set(ipsec_site_base + [peer, 'authentication', 'rsa', 'remote-key'], value=remote_key_name)
+        config.delete(ipsec_site_base + [peer, 'authentication', 'rsa-key-name'])
+
+try:
+    with open(file_name, 'w') as f:
+        f.write(config.to_string())
+except OSError as e:
+    print("Failed to save the modified config: {}".format(e))
+    sys.exit(1)