File Manager - BorneoXploit

Editing: openssh.py

# SPDX-License-Identifier: LGPL-2.1-or-later

import os
import re
import subprocess
from tempfile import mkstemp

from .configgenerator import ConfigGenerator

class OpenSSHGenerator(ConfigGenerator):
    cipher_map = {
        'AES-256-GCM': 'aes256-gcm@openssh.com',
        'AES-256-CTR': 'aes256-ctr',
        'AES-192-GCM': '',  # not supported
        'AES-192-CTR': 'aes192-ctr',
        'AES-128-GCM': 'aes128-gcm@openssh.com',
        'AES-128-CTR': 'aes128-ctr',
        'CHACHA20-POLY1305': 'chacha20-poly1305@openssh.com',
        'CAMELLIA-256-GCM': '',
        'AES-256-CCM': '',
        'AES-192-CCM': '',
        'AES-128-CCM': '',
        'CAMELLIA-128-GCM': '',
        'AES-256-CBC': 'aes256-cbc',
        'AES-192-CBC': 'aes192-cbc',
        'AES-128-CBC': 'aes128-cbc',
        'CAMELLIA-256-CBC': '',
        'CAMELLIA-128-CBC': '',
        'RC4-128': '',
        'DES-CBC': '',
        'CAMELLIA-128-CTS': '',
        '3DES-CBC': '3des-cbc'
    }

mac_map_etm = {
        'HMAC-MD5': 'hmac-md5-etm@openssh.com',
        'UMAC-64': 'umac-64-etm@openssh.com',
        'UMAC-128': 'umac-128-etm@openssh.com',
        'HMAC-SHA1': 'hmac-sha1-etm@openssh.com',
        'HMAC-SHA2-256': 'hmac-sha2-256-etm@openssh.com',
        'HMAC-SHA2-512': 'hmac-sha2-512-etm@openssh.com'
    }

mac_map = {
        'HMAC-MD5': 'hmac-md5',
        'UMAC-64': 'umac-64@openssh.com',
        'UMAC-128': 'umac-128@openssh.com',
        'HMAC-SHA1': 'hmac-sha1',
        'HMAC-SHA2-256': 'hmac-sha2-256',
        'HMAC-SHA2-512': 'hmac-sha2-512'
    }

kx_map = {
        ('ECDHE', 'SECP521R1', 'SHA2-512'): ('ecdh-sha2-nistp521',),
        ('ECDHE', 'SECP384R1', 'SHA2-384'): ('ecdh-sha2-nistp384',),
        ('ECDHE', 'SECP256R1', 'SHA2-256'): ('ecdh-sha2-nistp256',),
        ('ECDHE', 'X25519', 'SHA2-256'): (
            'curve25519-sha256',
            'curve25519-sha256@libssh.org',
        ),
        ('DHE', 'FFDHE-1024', 'SHA1'): ('diffie-hellman-group1-sha1',),
        ('DHE', 'FFDHE-2048', 'SHA1'): ('diffie-hellman-group14-sha1',),
        ('DHE', 'FFDHE-2048', 'SHA2-256'): ('diffie-hellman-group14-sha256',),
        ('DHE', 'FFDHE-4096', 'SHA2-512'): ('diffie-hellman-group16-sha512',),
        ('DHE', 'FFDHE-8192', 'SHA2-512'): ('diffie-hellman-group18-sha512',),
        ('KEM-ECDH', 'MLKEM768-X25519', 'SHA2-256'): (
            'mlkem768x25519-sha256',
        ),
        ('KEM-ECDH', 'P256-MLKEM768', 'SHA2-256'): (
            'mlkem768nistp256-sha256',
        ),
        ('KEM-ECDH', 'P384-MLKEM1024', 'SHA2-384'): (
            'mlkem1024nistp384-sha384',
        ),
    }

gx_map = {
        ('DHE', 'SHA1'): ('diffie-hellman-group-exchange-sha1',),
        ('DHE', 'SHA2-256'): ('diffie-hellman-group-exchange-sha256',),
    }

gss_kx_map = {
        ('DHE-GSS', 'SHA1'): ('gss-gex-sha1-',),
        ('DHE-GSS', 'FFDHE-1024', 'SHA1'): ('gss-group1-sha1-',),
        ('DHE-GSS', 'FFDHE-2048', 'SHA1'): ('gss-group14-sha1-',),
        ('DHE-GSS', 'FFDHE-2048', 'SHA2-256'): ('gss-group14-sha256-',),
        ('ECDHE-GSS', 'SECP256R1', 'SHA2-256'): ('gss-nistp256-sha256-',),
        ('ECDHE-GSS', 'X25519', 'SHA2-256'): ('gss-curve25519-sha256-',),
        ('DHE-GSS', 'FFDHE-4096', 'SHA2-512'): ('gss-group16-sha512-',),
    }

sign_map = {
        'RSA-SHA1': 'ssh-rsa',
        'DSA-SHA1': '',  # openssh no longer recognizes it
        'RSA-SHA2-256': 'rsa-sha2-256',
        'RSA-SHA2-512': 'rsa-sha2-512',
        'ECDSA-SHA2-256': 'ecdsa-sha2-nistp256',
        'ECDSA-SHA2-256-FIDO': 'sk-ecdsa-sha2-nistp256@openssh.com',
        'ECDSA-SHA2-384': 'ecdsa-sha2-nistp384',
        'ECDSA-SHA2-512': 'ecdsa-sha2-nistp521',
        'EDDSA-ED25519': 'ssh-ed25519',
        'EDDSA-ED25519-FIDO': 'sk-ssh-ed25519@openssh.com',
    }

sign_map_certs = {
        'RSA-SHA1': 'ssh-rsa-cert-v01@openssh.com',
        'DSA-SHA1': '',  # openssh no longer recognizes it
        'RSA-SHA2-256': 'rsa-sha2-256-cert-v01@openssh.com',
        'RSA-SHA2-512': 'rsa-sha2-512-cert-v01@openssh.com',
        'ECDSA-SHA2-256': 'ecdsa-sha2-nistp256-cert-v01@openssh.com',
        'ECDSA-SHA2-256-FIDO': 'sk-ecdsa-sha2-nistp256-cert-v01@openssh.com',
        'ECDSA-SHA2-384': 'ecdsa-sha2-nistp384-cert-v01@openssh.com',
        'ECDSA-SHA2-512': 'ecdsa-sha2-nistp521-cert-v01@openssh.com',
        'EDDSA-ED25519': 'ssh-ed25519-cert-v01@openssh.com',
        'EDDSA-ED25519-FIDO': 'sk-ssh-ed25519-cert-v01@openssh.com',
    }

@classmethod
    def generate_options(cls, policy, local_kx_map, local_gss_kx_map,
                         do_host_key):
        p = policy.enabled
        cfg = ''
        sep = ','

s = ''
        for i in p['cipher']:
            try:
                s = cls.append(s, cls.cipher_map[i], sep)
            except KeyError:
                pass

if s:
            cfg += f'Ciphers {s}\n'

s = ''
        if policy.enums['etm'] != 'DISABLE_ETM':
            for i in p['mac']:
                try:
                    s = cls.append(s, cls.mac_map_etm[i], sep)
                except KeyError:
                    pass
        if policy.enums['etm'] != 'DISABLE_NON_ETM':
            for i in p['mac']:
                try:
                    s = cls.append(s, cls.mac_map[i], sep)
                except KeyError:
                    pass

if s:
            cfg += f'MACs {s}\n'

kxs = []
        gss_kxs = []
        for kx in p['key_exchange']:
            for h in p['hash']:
                if policy.integers['arbitrary_dh_groups']:
                    try:
                        kxs.extend(cls.gx_map[(kx, h)])
                    except KeyError:
                        pass
                    try:
                        gss_kxs.extend(local_gss_kx_map[(kx, h)])
                    except KeyError:
                        pass
                for g in p['group']:
                    try:
                        kxs.extend(local_kx_map[(kx, g, h)])
                    except KeyError:
                        pass
                    try:
                        gss_kxs.extend(local_gss_kx_map[(kx, g, h)])
                    except KeyError:
                        pass

if gss_kxs:
            cfg += f'GSSAPIKexAlgorithms {",".join(gss_kxs)}\n'
        else:
            cfg += 'GSSAPIKeyExchange no\n'

if kxs:
            cfg += f'KexAlgorithms {",".join(kxs)}\n'

s = ''
        for i in p['sign']:
            try:
                s = cls.append(s, cls.sign_map[i], sep)
            except KeyError:
                pass
            if policy.integers['ssh_certs']:
                try:
                    s = cls.append(s, cls.sign_map_certs[i], sep)
                except KeyError:
                    pass

if s:
            # As OpenSSH currently ignores existing known host
            # entries with this setting we cannot use it on client.
            # Otherwise we could break existing users.
            if do_host_key:
                cfg += f'HostKeyAlgorithms {s}\n'
            cfg += f'PubkeyAcceptedAlgorithms {s}\n'
            cfg += f'HostbasedAcceptedAlgorithms {s}\n'

s = ''
        for i in p['sign']:
            try:
                s = cls.append(s, cls.sign_map[i], sep)
            except KeyError:
                pass

if s:
            cfg += f'CASignatureAlgorithms {s}\n'

if policy.integers['min_rsa_size'] > 0:
            cfg += f"RequiredRSASize {policy.integers['min_rsa_size']}\n"

return cfg

class OpenSSHClientGenerator(OpenSSHGenerator):
    CONFIG_NAME = 'openssh'

@classmethod
    def generate_config(cls, unscoped_policy):
        policy = unscoped_policy.scoped({'ssh', 'openssh', 'openssh-client'})
        local_kx_map = dict(cls.kx_map)
        local_gss_kx_map = dict(cls.gss_kx_map)

return cls.generate_options(policy, local_kx_map, local_gss_kx_map,
                                    do_host_key=False)

@classmethod
    def test_config(cls, config):
        if os.getenv('OLD_OPENSSH') == '1':
            return True
        if not os.access('/usr/bin/ssh', os.X_OK):
            return True

fd, path = mkstemp()

ret = 255
        try:
            with os.fdopen(fd, 'w') as f:
                f.write(config)
            try:
                ret = subprocess.call(f'/usr/bin/ssh -G -F {path} '
                                      'bogus654_server >/dev/null', shell=True)
            except subprocess.CalledProcessError:
                cls.eprint("/usr/bin/ssh: Execution failed")
        finally:
            os.unlink(path)

if ret:
            cls.eprint('There is an error in OpenSSH server generated policy')
            cls.eprint(f'Policy:\n{config}')
            return False
        return True

class OpenSSHServerGenerator(OpenSSHGenerator):
    CONFIG_NAME = 'opensshserver'

# We need to restart here,
    # since systemd needs to pick up new command line options
    RELOAD_CMD = 'systemctl try-restart sshd.service 2>/dev/null || :\n'

@classmethod
    def generate_config(cls, unscoped_policy):
        policy = unscoped_policy.scoped({'ssh', 'openssh', 'openssh-server'})
        return cls.generate_options(policy, cls.kx_map, cls.gss_kx_map,
                                    do_host_key=True)

@classmethod
    def _test_setup(cls):
        _fd, path = mkstemp()
        os.unlink(path)
        ret = 255
        try:
            ret = subprocess.call('/usr/bin/ssh-keygen -t rsa -b 3072 '
                                  f'-f {path} -N "" >/dev/null', shell=True)
        except subprocess.CalledProcessError:
            cls.eprint("/usr/bin/ssh-keygen: Execution failed")

if ret:
            cls.eprint("SSH Keygen failed when testing OpenSSH server policy")
            return ''
        return path

@classmethod
    def _test_cleanup(cls, path):
        if path:
            os.unlink(path)

@classmethod
    def test_config(cls, config):

if os.getenv('OLD_OPENSSH') == '1':
            return True
        if not os.access('/usr/sbin/sshd', os.X_OK):
            return True

host_key_filename = cls._test_setup()
        if not host_key_filename:
            return False

fd, path = mkstemp()

ret = 255
        try:
            with os.fdopen(fd, 'w') as f:
                f.write(config)
            try:
                ret = subprocess.call('/usr/sbin/sshd -T '
                                      f'-h {host_key_filename} -f {path} '
                                      '>/dev/null', shell=True)
            except subprocess.CalledProcessError:
                cls.eprint("/usr/sbin/sshd: Execution failed")
        finally:
            os.unlink(path)
            cls._test_cleanup(host_key_filename)

if ret:
            cls.eprint('There is an error in OpenSSH server generated policy')
            cls.eprint(f'Policy:\n{config}')
            return False
        return True

def _openssh_version():
    try:
        ssh_version = subprocess.run(['/usr/bin/ssh', '-V'], check=False,
                                     stderr=subprocess.PIPE).stderr.decode()
        ver = re.match(r'OpenSSH_(\d+).(\d+)p.*', ssh_version)
        if ver:
            return tuple(int(n) for n in ver.groups())
    except (FileNotFoundError, PermissionError):
        return None
    return None

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