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authorChristian Breunig <christian@breunig.cc>2023-12-30 23:25:20 +0100
committerChristian Breunig <christian@breunig.cc>2023-12-31 23:49:48 +0100
commit4ef110fd2c501b718344c72d495ad7e16d2bd465 (patch)
treee98bf08f93c029ec4431a3b6ca078e7562e0cc58 /src/conf_mode/service_ssh.py
parent2286b8600da6c631b17e1d5b9b341843e50f9abf (diff)
downloadvyos-1x-4ef110fd2c501b718344c72d495ad7e16d2bd465.tar.gz
vyos-1x-4ef110fd2c501b718344c72d495ad7e16d2bd465.zip
T5474: establish common file name pattern for XML conf mode commands
We will use _ as CLI level divider. The XML definition filename and also the Python helper should match the CLI node. Example: set interfaces ethernet -> interfaces_ethernet.xml.in set interfaces bond -> interfaces_bond.xml.in set service dhcp-server -> service_dhcp-server-xml.in
Diffstat (limited to 'src/conf_mode/service_ssh.py')
-rwxr-xr-xsrc/conf_mode/service_ssh.py142
1 files changed, 142 insertions, 0 deletions
diff --git a/src/conf_mode/service_ssh.py b/src/conf_mode/service_ssh.py
new file mode 100755
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+++ b/src/conf_mode/service_ssh.py
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+#!/usr/bin/env python3
+#
+# Copyright (C) 2018-2022 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 os
+
+from sys import exit
+from syslog import syslog
+from syslog import LOG_INFO
+
+from vyos.config import Config
+from vyos.configdict import is_node_changed
+from vyos.configverify import verify_vrf
+from vyos.utils.process import call
+from vyos.template import render
+from vyos import ConfigError
+from vyos import airbag
+airbag.enable()
+
+config_file = r'/run/sshd/sshd_config'
+systemd_override = r'/run/systemd/system/ssh.service.d/override.conf'
+
+sshguard_config_file = '/etc/sshguard/sshguard.conf'
+sshguard_whitelist = '/etc/sshguard/whitelist'
+
+key_rsa = '/etc/ssh/ssh_host_rsa_key'
+key_dsa = '/etc/ssh/ssh_host_dsa_key'
+key_ed25519 = '/etc/ssh/ssh_host_ed25519_key'
+
+def get_config(config=None):
+ if config:
+ conf = config
+ else:
+ conf = Config()
+ base = ['service', 'ssh']
+ if not conf.exists(base):
+ return None
+
+ ssh = conf.get_config_dict(base, key_mangling=('-', '_'), get_first_key=True)
+
+ tmp = is_node_changed(conf, base + ['vrf'])
+ if tmp: ssh.update({'restart_required': {}})
+
+ # We have gathered the dict representation of the CLI, but there are default
+ # options which we need to update into the dictionary retrived.
+ ssh = conf.merge_defaults(ssh, recursive=True)
+
+ # pass config file path - used in override template
+ ssh['config_file'] = config_file
+
+ # Ignore default XML values if config doesn't exists
+ # Delete key from dict
+ if not conf.exists(base + ['dynamic-protection']):
+ del ssh['dynamic_protection']
+
+ return ssh
+
+def verify(ssh):
+ if not ssh:
+ return None
+
+ if 'rekey' in ssh and 'data' not in ssh['rekey']:
+ raise ConfigError(f'Rekey data is required!')
+
+ verify_vrf(ssh)
+ return None
+
+def generate(ssh):
+ if not ssh:
+ if os.path.isfile(config_file):
+ os.unlink(config_file)
+ if os.path.isfile(systemd_override):
+ os.unlink(systemd_override)
+
+ return None
+
+ # This usually happens only once on a fresh system, SSH keys need to be
+ # freshly generted, one per every system!
+ if not os.path.isfile(key_rsa):
+ syslog(LOG_INFO, 'SSH RSA host key not found, generating new key!')
+ call(f'ssh-keygen -q -N "" -t rsa -f {key_rsa}')
+ if not os.path.isfile(key_dsa):
+ syslog(LOG_INFO, 'SSH DSA host key not found, generating new key!')
+ call(f'ssh-keygen -q -N "" -t dsa -f {key_dsa}')
+ if not os.path.isfile(key_ed25519):
+ syslog(LOG_INFO, 'SSH ed25519 host key not found, generating new key!')
+ call(f'ssh-keygen -q -N "" -t ed25519 -f {key_ed25519}')
+
+ render(config_file, 'ssh/sshd_config.j2', ssh)
+ render(systemd_override, 'ssh/override.conf.j2', ssh)
+
+ if 'dynamic_protection' in ssh:
+ render(sshguard_config_file, 'ssh/sshguard_config.j2', ssh)
+ render(sshguard_whitelist, 'ssh/sshguard_whitelist.j2', ssh)
+ # Reload systemd manager configuration
+ call('systemctl daemon-reload')
+
+ return None
+
+def apply(ssh):
+ systemd_service_ssh = 'ssh.service'
+ systemd_service_sshguard = 'sshguard.service'
+ if not ssh:
+ # SSH access is removed in the commit
+ call(f'systemctl stop {systemd_service_ssh}')
+ call(f'systemctl stop {systemd_service_sshguard}')
+ return None
+
+ if 'dynamic_protection' not in ssh:
+ call(f'systemctl stop {systemd_service_sshguard}')
+ else:
+ call(f'systemctl reload-or-restart {systemd_service_sshguard}')
+
+ # we need to restart the service if e.g. the VRF name changed
+ systemd_action = 'reload-or-restart'
+ if 'restart_required' in ssh:
+ systemd_action = 'restart'
+
+ call(f'systemctl {systemd_action} {systemd_service_ssh}')
+ return None
+
+if __name__ == '__main__':
+ try:
+ c = get_config()
+ verify(c)
+ generate(c)
+ apply(c)
+ except ConfigError as e:
+ print(e)
+ exit(1)