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, 219 insertions, 0 deletions

diff --git a/src/conf_mode/system-login-user.py b/src/conf_mode/system-login-user.py
new file mode 100755
index 000000000..3317f87d8
--- /dev/null
+++ b/src/conf_mode/system-login-user.py
@@ -0,0 +1,219 @@
+#!/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
+
+from pwd import getpwall, getpwnam
+from stat import S_IRUSR, S_IWUSR, S_IRWXU, S_IRGRP, S_IXGRP
+from subprocess import Popen, PIPE, STDOUT
+
+from vyos.config import Config
+from vyos.configdict import list_diff
+from vyos import ConfigError
+
+default_config_data = {
+    'deleted': False,
+    'add_users': [],
+    'del_users': []
+}
+
+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_crypt_pw(password):
+    command = '/usr/bin/mkpasswd --method=sha-512 {}'.format(password)
+    p = Popen(command, stdout=PIPE, stderr=STDOUT, shell=True)
+    tmp = p.communicate()[0].strip()
+    return tmp.decode()
+
+
+def get_config():
+    login = default_config_data
+    conf = Config()
+    base_level = ['system', 'login', 'user']
+
+    if not conf.exists(base_level):
+        login['deleted'] = True
+        return login
+
+    # Read in all local users and store to list
+    for username in conf.list_nodes(base_level):
+        user = {
+            'name': username,
+            'password_plaintext': '',
+            'password_encrypted': '!',
+            'public_keys': [],
+            'full_name': '',
+            'home_dir': '/home/' + username,
+        }
+        conf.set_level(base_level + [username])
+
+        # Plaintext password
+        if conf.exists(['authentication', 'plaintext-password']):
+            user['password_plaintext'] = conf.return_value(['authentication', 'plaintext-password'])
+
+        # Encrypted password
+        if conf.exists(['authentication', 'encrypted-password']):
+            user['password_encrypted'] = conf.return_value(['authentication', 'encrypted-password'])
+
+        # User real name
+        if conf.exists(['full-name']):
+            user['full_name'] = conf.return_value(['full-name'])
+
+        # User home-directory
+        if conf.exists(['home-directory']):
+            user['home_dir'] = conf.return_value(['home-directory'])
+
+        # Read in public keys
+        for id in conf.list_nodes(['authentication', 'public-keys']):
+            key = {
+                'name': id,
+                'key': '',
+                'options': '',
+                'type': ''
+            }
+            conf.set_level(base_level + [username, 'authentication', 'public-keys', id])
+
+            # Public Key portion
+            if conf.exists(['key']):
+                key['key'] = conf.return_value(['key'])
+
+            # Options for individual public key
+            if conf.exists(['options']):
+                key['options'] = conf.return_value(['options'])
+
+            # Type of public key
+            if conf.exists(['type']):
+                key['type'] = conf.return_value(['type'])
+
+            # Append individual public key to list of user keys
+            user['public_keys'].append(key)
+
+        login['add_users'].append(user)
+
+    return login
+
+def verify(login):
+    pass
+
+def generate(login):
+    # users no longer existing in the running configuration need to be deleted
+    local_users = get_local_users()
+    cli_users = [tmp['name'] for tmp in login['add_users']]
+    # create a list of all users, cli and users
+    all_users = list(set(local_users+cli_users))
+
+    # Remove any normal users that dos not exist in the current configuration.
+    # This can happen if user is added but configuration was not saved and
+    # system is rebooted.
+    login['del_users'] = [tmp for tmp in all_users if tmp not in cli_users]
+
+    # calculate users encrypted password
+    for user in login['add_users']:
+        if user['password_plaintext']:
+            user['password_encrypted'] = get_crypt_pw(user['password_plaintext'])
+            user['password_plaintext'] = ''
+
+            # remove old plaintext password
+            # and set new encrypted password
+            os.system("vyos_libexec_dir=/usr/libexec/vyos /opt/vyatta/sbin/my_set system login user '{}' authentication plaintext-password '' >/dev/null".format(user['name']))
+            os.system("vyos_libexec_dir=/usr/libexec/vyos /opt/vyatta/sbin/my_set system login user '{}' authentication encrypted-password '{}' >/dev/null".format(user['name'], user['password_encrypted']))
+
+    return None
+
+def apply(login):
+    for user in login['add_users']:
+        # make new user using vyatta shell and make home directory (-m),
+        # default group of 100 (users)
+        cmd = "useradd -m -N"
+        # check if user already exists:
+        if user['name'] in get_local_users():
+            # update existing account
+            cmd = "usermod"
+
+        # encrypted password must be quited in '' else it won't work!
+        cmd += " -p '{}'".format(user['password_encrypted'])
+        cmd += " -s /bin/vbash"
+        if user['full_name']:
+            cmd += " -c {}".format(user['full_name'])
+
+        if user['home_dir']:
+            cmd += " -d '{}'".format(user['home_dir'])
+
+        cmd += " -G frrvty,vyattacfg,sudo,adm,dip,disk"
+        cmd += " {}".format(user['name'])
+
+        try:
+            os.system(cmd)
+
+            uid = getpwnam(user['name']).pw_uid
+            gid = getpwnam(user['name']).pw_gid
+
+            # install ssh keys
+            key_dir = '{}/.ssh'.format(user['home_dir'])
+            if not os.path.isdir(key_dir):
+                os.mkdir(key_dir)
+                os.chown(key_dir, uid, gid)
+                os.chmod(key_dir, S_IRWXU | S_IRGRP | S_IXGRP)
+
+            key_file = key_dir + '/authorized_keys';
+            with open(key_file, 'w') as f:
+                f.write("# Automatically generated by VyOS\n")
+                f.write("# Do not edit, all changes will be lost\n")
+
+                for id in user['public_keys']:
+                    line = ''
+                    if id['options']:
+                        line = '{} '.format(id['options'])
+
+                    line += '{} {} {}\n'.format(id['type'], id['key'], id['name'])
+                    f.write(line)
+
+            os.chown(key_file, uid, gid)
+            os.chmod(key_file, S_IRUSR | S_IWUSR)
+
+        except Exception as e:
+            print('Adding user "{}" raised an exception'.format(user))
+
+    for user in login['del_users']:
+        try:
+            # Remove user account but leave home directory to be safe
+            os.system('userdel {}'.format(user))
+        except Exception as e:
+            print('Deleting user "{}" raised an exception'.format(user))
+
+    return None
+
+if __name__ == '__main__':
+    try:
+        c = get_config()
+        verify(c)
+        generate(c)
+        apply(c)
+    except ConfigError as e:
+        print(e)
+        sys.exit(1)