ocserv: T4420: show configured 2FA OTP key

1 files changed, 109 insertions, 0 deletions

diff --git a/src/op_mode/show_openconnect_otp.py b/src/op_mode/show_openconnect_otp.py
new file mode 100755
index 000000000..ae532ccc9
--- /dev/null
+++ b/src/op_mode/show_openconnect_otp.py
@@ -0,0 +1,109 @@
+#!/usr/bin/env python3
+
+# Copyright 2017, 2022 VyOS maintainers and contributors <maintainers@vyos.io>
+#
+# This library is free software; you can redistribute it and/or
+# modify it under the terms of the GNU Lesser General Public
+# License as published by the Free Software Foundation; either
+# version 2.1 of the License, or (at your option) any later version.
+#
+# This library 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
+# Lesser General Public License for more details.
+#
+# You should have received a copy of the GNU Lesser General Public
+# License along with this library.  If not, see <http://www.gnu.org/licenses/>.
+
+import argparse
+import os
+
+from vyos.config import Config
+from vyos.xml import defaults
+from vyos.configdict import dict_merge
+from vyos.util import popen
+from base64 import b32encode
+
+otp_file = '/run/ocserv/users.oath'
+
+def check_uname_otp(username):
+    """
+    Check if "username" exists and have an OTP key
+    """
+    config = Config()
+    base_key = ['vpn', 'openconnect', 'authentication', 'local-users', 'username', username, 'otp', 'key']
+    if not config.exists(base_key):
+        return None
+    return True
+
+def get_otp_ocserv(username):
+    config = Config()
+    base = ['vpn', 'openconnect']
+    if not config.exists(base):
+        return None
+    ocserv = config.get_config_dict(base, key_mangling=('-', '_'), get_first_key=True)
+    # We have gathered the dict representation of the CLI, but there are default
+    # options which we need to update into the dictionary retrived.
+    default_values = defaults(base)
+    ocserv = dict_merge(default_values, ocserv)
+    # workaround a "know limitation" - https://phabricator.vyos.net/T2665
+    del ocserv['authentication']['local_users']['username']['otp']
+    if not ocserv["authentication"]["local_users"]["username"]:
+        return None
+    default_ocserv_usr_values = default_values['authentication']['local_users']['username']['otp']
+    for user, params in ocserv['authentication']['local_users']['username'].items():
+        # Not every configuration requires OTP settings
+        if ocserv['authentication']['local_users']['username'][user].get('otp'):
+            ocserv['authentication']['local_users']['username'][user]['otp'] = dict_merge(default_ocserv_usr_values, ocserv['authentication']['local_users']['username'][user]['otp'])
+    result = ocserv['authentication']['local_users']['username'][username]
+    return result
+
+def display_otp_ocserv(username, params, info):
+    hostname = os.uname()[1]
+    key_hex = params['otp']['key']
+    otp_length = params['otp']['otp_length']
+    interval = params['otp']['interval']
+    token_type = params['otp']['token_type']
+    if token_type == 'hotp-time':
+        token_type_acrn = 'totp'
+    key_base32 = b32encode(bytes.fromhex(key_hex)).decode()
+    otp_url = ''.join(["otpauth://",token_type_acrn,"/",username,"@",hostname,"?secret=",key_base32,"&digits=",otp_length,"&period=",interval])
+    qrcode,err = popen('qrencode -t ansiutf8', input=otp_url)
+
+    if info == 'full':
+        print("# You can share it with the user, he just needs to scan the QR in his OTP app")
+        print("# username: ", username)
+        print("# OTP KEY: ", key_base32)
+        print("# OTP URL: ", otp_url)
+        print(qrcode)
+        print('# To add this OTP key to configuration, run the following commands:')
+        print(f"set vpn openconnect authentication local-users username {username} otp key '{key_hex}'")
+        if interval != "30":
+            print(f"set vpn openconnect authentication local-users username {username} otp interval '{interval}'")
+        if otp_length != "6":
+            print(f"set vpn openconnect authentication local-users username {username} otp otp-length '{otp_length}'")
+    elif info == 'key-hex':
+        print("# OTP key in hexadecimal: ")
+        print(key_hex)
+    elif info == 'key-b32':
+        print("# OTP key in Base32: ")
+        print(key_base32)
+    elif info == 'qrcode':
+        print(f"# QR code for OpenConnect user '{username}'")
+        print(qrcode)
+    elif info == 'uri':
+        print(f"# URI for OpenConnect user '{username}'")
+        print(otp_url)
+
+if __name__ == '__main__':
+    parser = argparse.ArgumentParser(add_help=False, description='Show OTP authentication information for selected user')
+    parser.add_argument('--user', action="store", type=str, default='', help='Username')
+    parser.add_argument('--info', action="store", type=str, default='full', help='Wich information to display')
+
+    args = parser.parse_args()
+    check_otp = check_uname_otp(args.user)
+    if check_otp:
+        user_otp_params = get_otp_ocserv(args.user)
+        display_otp_ocserv(args.user, user_otp_params, args.info)
+    else:
+        print(f'There is no such user ("{args.user}") with an OTP key configured')