login: T4754: show configured 2FA OTP key

1 files changed, 124 insertions, 0 deletions

diff --git a/src/op_mode/otp.py b/src/op_mode/otp.py
new file mode 100755
index 000000000..c472a1ed3
--- /dev/null
+++ b/src/op_mode/otp.py
@@ -0,0 +1,124 @@
+#!/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 sys
+import os
+import vyos.opmode
+from jinja2 import Template
+from vyos.configquery import ConfigTreeQuery
+from vyos.xml import defaults
+from vyos.configdict import dict_merge
+from vyos.util import popen
+
+
+users_otp_template = Template("""
+{% if info == "full" %}
+# You can share it with the user, he just needs to scan the QR in his OTP app
+# username: {{username}}
+# OTP KEY: {{key_base32}}
+# OTP URL: {{otp_url}}
+{{qrcode}}
+# To add this OTP key to configuration, run the following commands:
+set system login user {{username}} authentication otp key '{{key_base32}}'
+{% if rate_limit != "3" %}
+set system login user {{username}} authentication otp rate-limit '{{rate_limit}}'
+{% endif %}
+{% if rate_time != "30" %}
+set system login user {{username}} authentication otp rate-time '{{rate_time}}'
+{% endif %}
+{% if window_size != "3" %}
+set system login user {{username}} authentication otp window-size '{{window_size}}'
+{% endif %}
+{% elif info == "key-b32" %}
+# OTP key in Base32 for system user {{username}}:
+{{key_base32}}
+{% elif info == "qrcode" %}
+# QR code for system user '{{username}}'
+{{qrcode}}
+{% elif info == "uri" %}
+# URI for system user '{{username}}'
+{{otp_url}}
+{% endif %}
+""", trim_blocks=True, lstrip_blocks=True)
+
+
+def _check_uname_otp(username:str):
+    """
+    Check if "username" exists and have an OTP key
+    """
+    config = ConfigTreeQuery()
+    base_key = ['system', 'login', 'user', username, 'authentication', 'otp', 'key']
+    if not config.exists(base_key):
+        return None
+    return True
+
+def _get_login_otp(username: str, info:str):
+    """
+    Retrieve user settings from configuration and set some defaults
+    """
+    config = ConfigTreeQuery()
+    base = ['system', 'login', 'user', username]
+    if not config.exists(base):
+        return None
+    user_otp = 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(['system', 'login', 'user'])
+    user_otp = dict_merge(default_values, user_otp)
+    result = user_otp['authentication']['otp']
+    # Filling in the system and default options
+    result['info'] = info
+    result['hostname'] = os.uname()[1]
+    result['username'] = username
+    result['key_base32'] = result['key']
+    result['otp_length'] = '6'
+    result['interval'] = '30'
+    result['token_type'] = 'hotp-time'
+    if result['token_type'] == 'hotp-time':
+        token_type_acrn = 'totp'
+    result['otp_url'] = ''.join(["otpauth://",token_type_acrn,"/",username,"@",\
+        result['hostname'],"?secret=",result['key_base32'],"&digits=",\
+        result['otp_length'],"&period=",result['interval']])
+    result['qrcode'],err = popen('qrencode -t ansiutf8', input=result['otp_url'])
+    return result
+
+def show_login(raw: bool, username: str, info:str):
+    '''
+    Display OTP parameters for <username>
+    '''
+    check_otp = _check_uname_otp(username)
+    if check_otp:
+        user_otp_params = _get_login_otp(username, info)
+    else:
+        print(f'There is no such user ("{username}") with an OTP key configured')
+        print('You can use the following command to generate a key for a user:\n')
+        print(f'generate system login username {username} otp-key hotp-time')
+        sys.exit(0)
+    if raw:
+        return user_otp_params
+    return users_otp_template.render(user_otp_params)
+
+
+if __name__ == '__main__':
+    try:
+        res = vyos.opmode.run(sys.modules[__name__])
+        if res:
+            print(res)
+    except (ValueError, vyos.opmode.Error) as e:
+        print(e)
+        sys.exit(1)