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#!/usr/bin/env python3
#
# Copyright (C) 2021 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/>.

# Migrate Wireguard to store keys in CLI
# Migrate EAPoL to PKI configuration

import os
import sys
from vyos.configtree import ConfigTree
from vyos.pki import load_certificate
from vyos.pki import load_crl
from vyos.pki import load_dh_parameters
from vyos.pki import load_private_key
from vyos.pki import encode_certificate
from vyos.pki import encode_dh_parameters
from vyos.pki import encode_private_key
from vyos.util import run

def wrapped_pem_to_config_value(pem):
    out = []
    for line in pem.strip().split("\n"):
        if not line or line.startswith("-----") or line[0] == '#':
            continue
        out.append(line)
    return "".join(out)

def read_file_for_pki(config_auth_path):
    full_path = os.path.join(AUTH_DIR, config_auth_path)
    output = None

    if os.path.isfile(full_path):
        if not os.access(full_path, os.R_OK):
            run(f'sudo chmod 644 {full_path}')

        with open(full_path, 'r') as f:
            output = f.read()

    return output

if (len(sys.argv) < 1):
    print("Must specify file name!")
    sys.exit(1)

file_name = sys.argv[1]

with open(file_name, 'r') as f:
    config_file = f.read()

config = ConfigTree(config_file)

AUTH_DIR = '/config/auth'
pki_base = ['pki']

# OpenVPN
base = ['interfaces', 'openvpn']

if config.exists(base):
    for interface in config.list_nodes(base):
        x509_base = base + [interface, 'tls']
        pki_name = f'openvpn_{interface}'

        if config.exists(base + [interface, 'shared-secret-key-file']):
            if not config.exists(pki_base + ['openvpn', 'shared-secret']):
                config.set(pki_base + ['openvpn', 'shared-secret'])
                config.set_tag(pki_base + ['openvpn', 'shared-secret'])

            key_file = config.return_value(base + [interface, 'shared-secret-key-file'])
            key = read_file_for_pki(key_file)
            key_pki_name = f'{pki_name}_shared'

            if key:
                config.set(pki_base + ['openvpn', 'shared-secret', key_pki_name, 'key'], value=wrapped_pem_to_config_value(key))
                config.set(pki_base + ['openvpn', 'shared-secret', key_pki_name, 'version'], value='1')
                config.set(base + [interface, 'shared-secret-key'], value=key_pki_name)
            else:
                print(f'Failed to migrate shared-secret-key on openvpn interface {interface}')

            config.delete(base + [interface, 'shared-secret-key-file'])

        if not config.exists(base + [interface, 'tls']):
            continue

        if config.exists(base + [interface, 'tls', 'auth-file']):
            if not config.exists(pki_base + ['openvpn', 'shared-secret']):
                config.set(pki_base + ['openvpn', 'shared-secret'])
                config.set_tag(pki_base + ['openvpn', 'shared-secret'])

            key_file = config.return_value(base + [interface, 'tls', 'auth-file'])
            key = read_file_for_pki(key_file)
            key_pki_name = f'{pki_name}_auth'

            if key:
                config.set(pki_base + ['openvpn', 'shared-secret', key_pki_name, 'key'], value=wrapped_pem_to_config_value(key))
                config.set(pki_base + ['openvpn', 'shared-secret', key_pki_name, 'version'], value='1')
                config.set(base + [interface, 'tls', 'auth-key'], value=key_pki_name)
            else:
                print(f'Failed to migrate auth-key on openvpn interface {interface}')

            config.delete(base + [interface, 'tls', 'auth-file'])

        if config.exists(base + [interface, 'tls', 'crypt-file']):
            if not config.exists(pki_base + ['openvpn', 'shared-secret']):
                config.set(pki_base + ['openvpn', 'shared-secret'])
                config.set_tag(pki_base + ['openvpn', 'shared-secret'])

            key_file = config.return_value(base + [interface, 'tls', 'crypt-file'])
            key = read_file_for_pki(key_file)
            key_pki_name = f'{pki_name}_crypt'

            if key:
                config.set(pki_base + ['openvpn', 'shared-secret', key_pki_name, 'key'], value=wrapped_pem_to_config_value(key))
                config.set(pki_base + ['openvpn', 'shared-secret', key_pki_name, 'version'], value='1')
                config.set(base + [interface, 'tls', 'crypt-key'], value=key_pki_name)
            else:
                print(f'Failed to migrate crypt-key on openvpn interface {interface}')

            config.delete(base + [interface, 'tls', 'crypt-file'])

        if config.exists(x509_base + ['ca-cert-file']):
            if not config.exists(pki_base + ['ca']):
                config.set(pki_base + ['ca'])
                config.set_tag(pki_base + ['ca'])

            cert_file = config.return_value(x509_base + ['ca-cert-file'])
            cert_path = os.path.join(AUTH_DIR, cert_file)
            cert = None

            if os.path.isfile(cert_path):
                if not os.access(cert_path, os.R_OK):
                    run(f'sudo chmod 644 {cert_path}')

                with open(cert_path, 'r') as f:
                    cert_data = f.read()
                    cert = load_certificate(cert_data, wrap_tags=False)

            if cert:
                cert_pem = encode_certificate(cert)
                config.set(pki_base + ['ca', pki_name, 'certificate'], value=wrapped_pem_to_config_value(cert_pem))
                config.set(x509_base + ['ca-certificate'], value=pki_name)
            else:
                print(f'Failed to migrate CA certificate on openvpn interface {interface}')

            config.delete(x509_base + ['ca-cert-file'])

        if config.exists(x509_base + ['crl-file']):
            if not config.exists(pki_base + ['ca']):
                config.set(pki_base + ['ca'])
                config.set_tag(pki_base + ['ca'])

            crl_file = config.return_value(x509_base + ['crl-file'])
            crl_path = os.path.join(AUTH_DIR, crl_file)
            crl = None

            if os.path.isfile(crl_path):
                if not os.access(crl_path, os.R_OK):
                    run(f'sudo chmod 644 {crl_path}')

                with open(crl_path, 'r') as f:
                    crl_data = f.read()
                    crl = load_crl(crl_data, wrap_tags=False)

            if crl:
                crl_pem = encode_certificate(crl)
                config.set(pki_base + ['ca', pki_name, 'crl'], value=wrapped_pem_to_config_value(crl_pem))
            else:
                print(f'Failed to migrate CRL on openvpn interface {interface}')

            config.delete(x509_base + ['crl-file'])

        if config.exists(x509_base + ['cert-file']):
            if not config.exists(pki_base + ['certificate']):
                config.set(pki_base + ['certificate'])
                config.set_tag(pki_base + ['certificate'])

            cert_file = config.return_value(x509_base + ['cert-file'])
            cert_path = os.path.join(AUTH_DIR, cert_file)
            cert = None

            if os.path.isfile(cert_path):
                if not os.access(cert_path, os.R_OK):
                    run(f'sudo chmod 644 {cert_path}')

                with open(cert_path, 'r') as f:
                    cert_data = f.read()
                    cert = load_certificate(cert_data, wrap_tags=False)

            if cert:
                cert_pem = encode_certificate(cert)
                config.set(pki_base + ['certificate', pki_name, 'certificate'], value=wrapped_pem_to_config_value(cert_pem))
                config.set(x509_base + ['certificate'], value=pki_name)
            else:
                print(f'Failed to migrate certificate on openvpn interface {interface}')

            config.delete(x509_base + ['cert-file'])

        if config.exists(x509_base + ['key-file']):
            key_file = config.return_value(x509_base + ['key-file'])
            key_path = os.path.join(AUTH_DIR, key_file)
            key = None

            if os.path.isfile(key_path):
                if not os.access(key_path, os.R_OK):
                    run(f'sudo chmod 644 {key_path}')

                with open(key_path, 'r') as f:
                    key_data = f.read()
                    key = load_private_key(key_data, passphrase=None, wrap_tags=False)

            if key:
                key_pem = encode_private_key(key, passphrase=None)
                config.set(pki_base + ['certificate', pki_name, 'private', 'key'], value=wrapped_pem_to_config_value(key_pem))
            else:
                print(f'Failed to migrate private key on openvpn interface {interface}')
                
            config.delete(x509_base + ['key-file'])

        if config.exists(x509_base + ['dh-file']):
            if not config.exists(pki_base + ['dh']):
                config.set(pki_base + ['dh'])
                config.set_tag(pki_base + ['dh'])

            dh_file = config.return_value(x509_base + ['dh-file'])
            dh_path = os.path.join(AUTH_DIR, dh_file)
            dh = None

            if os.path.isfile(dh_path):
                if not os.access(dh_path, os.R_OK):
                    run(f'sudo chmod 644 {dh_path}')

                with open(dh_path, 'r') as f:
                    dh_data = f.read()
                    dh = load_dh_parameters(dh_data, wrap_tags=False)

            if dh:
                dh_pem = encode_dh_parameters(dh)
                config.set(pki_base + ['dh', pki_name, 'parameters'], value=wrapped_pem_to_config_value(dh_pem))
                config.set(x509_base + ['dh-params'], value=pki_name)
            else:
                print(f'Failed to migrate DH parameters on openvpn interface {interface}')

            config.delete(x509_base + ['dh-file'])

# Wireguard
base = ['interfaces', 'wireguard']

if config.exists(base):
    for interface in config.list_nodes(base):
        private_key_path = base + [interface, 'private-key']
        
        key_file = 'default'
        if config.exists(private_key_path):
            key_file = config.return_value(private_key_path)

        full_key_path = f'/config/auth/wireguard/{key_file}/private.key'

        if not os.path.exists(full_key_path):
            print(f'Could not find wireguard private key for migration on interface "{interface}"')
            continue

        with open(full_key_path, 'r') as f:
            key_data = f.read().strip()
            config.set(private_key_path, value=key_data)

        for peer in config.list_nodes(base + [interface, 'peer']):
            config.rename(base + [interface, 'peer', peer, 'pubkey'], 'public-key')

# Ethernet EAPoL
base = ['interfaces', 'ethernet']

if config.exists(base):
    for interface in config.list_nodes(base):
        if not config.exists(base + [interface, 'eapol']):
            continue

        x509_base = base + [interface, 'eapol']
        pki_name = f'eapol_{interface}'

        if config.exists(x509_base + ['ca-cert-file']):
            if not config.exists(pki_base + ['ca']):
                config.set(pki_base + ['ca'])
                config.set_tag(pki_base + ['ca'])

            cert_file = config.return_value(x509_base + ['ca-cert-file'])
            cert_path = os.path.join(AUTH_DIR, cert_file)
            cert = None

            if os.path.isfile(cert_path):
                if not os.access(cert_path, os.R_OK):
                    run(f'sudo chmod 644 {cert_path}')

                with open(cert_path, 'r') as f:
                    cert_data = f.read()
                    cert = load_certificate(cert_data, wrap_tags=False)

            if cert:
                cert_pem = encode_certificate(cert)
                config.set(pki_base + ['ca', pki_name, 'certificate'], value=wrapped_pem_to_config_value(cert_pem))
                config.set(x509_base + ['ca-certificate'], value=pki_name)
            else:
                print(f'Failed to migrate CA certificate on eapol config for interface {interface}')

            config.delete(x509_base + ['ca-cert-file'])

        if config.exists(x509_base + ['cert-file']):
            if not config.exists(pki_base + ['certificate']):
                config.set(pki_base + ['certificate'])
                config.set_tag(pki_base + ['certificate'])

            cert_file = config.return_value(x509_base + ['cert-file'])
            cert_path = os.path.join(AUTH_DIR, cert_file)
            cert = None

            if os.path.isfile(cert_path):
                if not os.access(cert_path, os.R_OK):
                    run(f'sudo chmod 644 {cert_path}')

                with open(cert_path, 'r') as f:
                    cert_data = f.read()
                    cert = load_certificate(cert_data, wrap_tags=False)

            if cert:
                cert_pem = encode_certificate(cert)
                config.set(pki_base + ['certificate', pki_name, 'certificate'], value=wrapped_pem_to_config_value(cert_pem))
                config.set(x509_base + ['certificate'], value=pki_name)
            else:
                print(f'Failed to migrate certificate on eapol config for interface {interface}')

            config.delete(x509_base + ['cert-file'])

        if config.exists(x509_base + ['key-file']):
            key_file = config.return_value(x509_base + ['key-file'])
            key_path = os.path.join(AUTH_DIR, key_file)
            key = None

            if os.path.isfile(key_path):
                if not os.access(key_path, os.R_OK):
                    run(f'sudo chmod 644 {key_path}')

                with open(key_path, 'r') as f:
                    key_data = f.read()
                    key = load_private_key(key_data, passphrase=None, wrap_tags=False)

            if key:
                key_pem = encode_private_key(key, passphrase=None)
                config.set(pki_base + ['certificate', pki_name, 'private', 'key'], value=wrapped_pem_to_config_value(key_pem))
            else:
                print(f'Failed to migrate private key on eapol config for interface {interface}')
                
            config.delete(x509_base + ['key-file'])

try:
    with open(file_name, 'w') as f:
        f.write(config.to_string())
except OSError as e:
    print("Failed to save the modified config: {}".format(e))
    sys.exit(1)