summaryrefslogtreecommitdiff
path: root/src/conf_mode/system-login.py
blob: 23152fee0e5de447062e056bb7e12980bd79361c (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
#!/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, S_IRWXU, S_IRGRP, S_IXGRP
from subprocess import Popen, PIPE, STDOUT
from psutil import users

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
{%- if radius_server %}
# server[:port]         shared_secret                           timeout (s)     source_ip
{% for s in radius_server %}
{%- if not s.disabled -%}
{{ s.address }}:{{ s.port }} {{ s.key }} {{ s.timeout }} {% if radius_source_address -%}{{ radius_source_address }}{% endif %}
{% endif %}
{%- endfor %}

priv-lvl 15
mapped_priv_user radius_priv_user
{% endif %}

"""

default_config_data = {
    'deleted': False,
    'add_users': [],
    'del_users': [],
    'radius_server': [],
    'radius_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_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']

    # We do not need to check if the nodes exist or not and bail out early
    # ... this would interrupt the following logic on determine which users
    # should be deleted and which users should stay.
    #
    # All fine so far!

    # Read in all local users and store to list
    for username in conf.list_nodes(base_level + ['user']):
        user = {
            'name': username,
            'password_plaintext': '',
            'password_encrypted': '!',
            'public_keys': [],
            'full_name': '',
            'home_dir': '/home/' + username,
        }
        conf.set_level(base_level + ['user', 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 + ['user', 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)

    #
    # RADIUS configuration
    #
    conf.set_level(base_level + ['radius'])

    if conf.exists(['source-address']):
        login['radius_source_address'] = conf.return_value(['source-address'])

    # Read in all RADIUS servers and store to list
    for server in conf.list_nodes(['server']):
        server_cfg = {
            'address': server,
            'disabled': False,
            'key': '',
            'port': '1812',
            'timeout': '2'
        }
        conf.set_level(base_level + ['radius', 'server', server])

        # Check if RADIUS server was temporary disabled
        if conf.exists(['disable']):
            server_cfg['disabled'] = True

        # RADIUS shared secret
        if conf.exists(['key']):
            server_cfg['key'] = conf.return_value(['key'])

        # RADIUS authentication port
        if conf.exists(['port']):
            server_cfg['port'] = conf.return_value(['port'])

        # RADIUS session timeout
        if conf.exists(['timeout']):
            server_cfg['timeout'] = conf.return_value(['timeout'])

        # Append individual RADIUS server configuration to global server list
        login['radius_server'].append(server_cfg)

    # 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]


    return login

def verify(login):
    cur_user = os.environ['SUDO_USER']
    if cur_user in login['del_users']:
        raise ConfigError('Attempting to delete current user: {}'.format(cur_user))

    # At lease one RADIUS server must not be disabled
    if len(login['radius_server']) > 0:
        fail = True
        for server in login['radius_server']:
            if not server['disabled']:
                fail = False
        if fail:
            raise ConfigError('At least one RADIUS server must be active.')


    return None

def generate(login):
    # 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']))

    if len(login['radius_server']) > 0:
        tmpl = jinja2.Template(radius_config_tmpl)
        config_text = tmpl.render(login)
        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:
        if os.path.isfile(radius_config_file):
            os.unlink(radius_config_file)

    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"

        # we need to use '' quotes when passing formatted data to the shell
        # else it will not work as some data parts are lost in translation
        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:
            raise ConfigError('Adding user "{}" raised an exception: {}'.format(user['name'], e))

    for user in login['del_users']:
        try:
            # Logout user if he is logged in
            if user in list(set([tmp[0] for tmp in users()])):
                print('{} is logged in, forcing logout'.format(user))
                os.system('pkill -HUP -u {}'.format(user))

            # Remove user account but leave home directory to be safe
            os.system('userdel -r {} 2>/dev/null'.format(user))

        except Exception as e:
            raise ConfigError('Deleting user "{}" raised an exception: {}'.format(user, e))

    #
    # RADIUS configuration
    #
    if len(login['radius_server']) > 0:
        try:
            # Enable RADIUS in PAM
            os.system("DEBIAN_FRONTEND=noninteractive pam-auth-update --package --enable radius")

            # Make NSS system aware of RADIUS, too
            cmd = "sed -i -e \'/\smapname/b\' \
                          -e \'/^passwd:/s/\s\s*/&mapuid /\' \
                          -e \'/^passwd:.*#/s/#.*/mapname &/\' \
                          -e \'/^passwd:[^#]*$/s/$/ mapname &/\' \
                          -e \'/^group:.*#/s/#.*/ mapname &/\' \
                          -e \'/^group:[^#]*$/s/: */&mapname /\' \
                          /etc/nsswitch.conf"

            os.system(cmd)

        except Exception as e:
            raise ConfigError('RADIUS configuration failed: {}'.format(e))

    else:
        try:
            # Disable RADIUS in PAM
            os.system("DEBIAN_FRONTEND=noninteractive pam-auth-update --package --remove radius")

            cmd = "sed -i -e \'/^passwd:.*mapuid[ \t]/s/mapuid[ \t]//\' \
                   -e \'/^passwd:.*[ \t]mapname/s/[ \t]mapname//\' \
                   -e \'/^group:.*[ \t]mapname/s/[ \t]mapname//\' \
                   -e \'s/[ \t]*$//\' \
                   /etc/nsswitch.conf"

            os.system(cmd)

        except Exception as e:
            raise ConfigError('Removing RADIUS configuration failed'.format(e))

    return None

if __name__ == '__main__':
    try:
        c = get_config()
        verify(c)
        generate(c)
        apply(c)
    except ConfigError as e:
        print(e)
        sys.exit(1)