ogin: user: radius: T1948: use discrete configuration for each system

Split combined XML/Python code to individual code for local user accounts
and RADIUS authenticated accounts.

1 files changed, 138 insertions, 0 deletions

diff --git a/src/conf_mode/system-login-radius.py b/src/conf_mode/system-login-radius.py
new file mode 100755
index 000000000..8f5d7bc36
--- /dev/null
+++ b/src/conf_mode/system-login-radius.py
@@ -0,0 +1,138 @@
+#!/usr/bin/env python3
+#
+# Copyright (C) 2020 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 sys
+import os
+import jinja2
+
+from pwd import getpwall, getpwnam
+from stat import S_IRUSR, S_IWUSR
+
+from vyos.config import Config
+from vyos.configdict import list_diff
+from vyos import ConfigError
+
+radius_config_file = "/etc/pam_radius_auth.conf"
+radius_config_tmpl = """
+# Automatically generated by VyOS
+# RADIUS configuration file
+# server[:port]         shared_secret                           timeout (s)     source_ip
+{% if server -%}
+{% for s in server -%}
+{{ s.address }}:{{ s.port }} {{ s.key }} {{ s.timeout }} {% if source_address -%}{{ source_address }}{% endif %}
+{% endfor -%}
+
+priv-lvl 15
+mapped_priv_user radius_priv_user
+{% endif %}
+
+"""
+
+default_config_data = {
+    'server': [],
+    'source_address': '',
+}
+
+def get_local_users():
+    """Returns list of dynamically allocated users (see Debian Policy Manual)"""
+    local_users = []
+    for p in getpwall():
+        username = p[0]
+        uid = getpwnam(username).pw_uid
+        if uid in range(1000, 29999):
+            if username not in ['radius_user', 'radius_priv_user']:
+                local_users.append(username)
+
+    return local_users
+
+def get_config():
+    radius = default_config_data
+    conf = Config()
+    base_level = ['system', 'login', 'radius']
+
+    if not conf.exists(base_level):
+        return radius
+
+    conf.set_level(base_level)
+
+    if conf.exists(['source-address']):
+        radius['source_address'] = conf.return_value(['source-address'])
+
+    # Read in all RADIUS servers and store to list
+    for server in conf.list_nodes(['server']):
+        radius = {
+            'address': server,
+            'key': '',
+            'port': '1812',
+            'timeout': '2'
+        }
+        conf.set_level(base_level + ['server', server])
+
+        # RADIUS shared secret
+        if conf.exists(['key']):
+            radius['key'] = conf.return_value(['key'])
+
+        # RADIUS authentication port
+        if conf.exists(['port']):
+            radius['port'] = conf.return_value(['port'])
+
+        # RADIUS session timeout
+        if conf.exists(['timeout']):
+            radius['timeout'] = conf.return_value(['timeout'])
+
+        # Append individual RADIUS server configuration to global server list
+        radius['server'].append(radius)
+
+    return radius
+
+def verify(radius):
+    pass
+
+def generate(radius):
+    if len(radius['server']) > 0:
+        tmpl = jinja2.Template(radius_config_tmpl)
+        config_text = tmpl.render(radius)
+        with open(radius_config_file, 'w') as f:
+            f.write(config_text)
+
+        uid = getpwnam('root').pw_uid
+        gid = getpwnam('root').pw_gid
+        os.chown(radius_config_file, uid, gid)
+        os.chmod(radius_config_file, S_IRUSR | S_IWUSR)
+    else:
+        os.unlink(radius_config_file)
+
+    return None
+
+def apply(radius):
+    if len(radius['server']) > 0:
+        # Enable RADIUS in PAM
+        os.system("DEBIAN_FRONTEND=noninteractive pam-auth-update --package --enable radius")
+    else:
+        # Disable RADIUS in PAM
+        os.system("DEBIAN_FRONTEND=noninteractive pam-auth-update --package --remove radius")
+
+    return None
+
+if __name__ == '__main__':
+    try:
+        c = get_config()
+        verify(c)
+        generate(c)
+        apply(c)
+    except ConfigError as e:
+        print(e)
+        sys.exit(1)