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# SPDX-License-Identifier: LGPL-2.1-or-later
# Copyright (c) 2019 Red Hat, Inc.
# Copyright (c) 2019 Tomáš Mráz <tmraz@fedoraproject.org>
from .configgenerator import ConfigGenerator
class LibsshGenerator(ConfigGenerator):
CONFIG_NAME = 'libssh'
SCOPES = {'ssh', 'libssh'}
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':'',
'UMAC-64':'',
'UMAC-128':'',
'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':'',
'UMAC-64':'',
'UMAC-128':'',
'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',
}
gx_map = {
'DHE-SHA1':'diffie-hellman-group-exchange-sha1',
'DHE-SHA2-256':'diffie-hellman-group-exchange-sha256',
}
sign_map = {
'RSA-SHA1':'ssh-rsa',
'DSA-SHA1':'ssh-dss',
'RSA-SHA2-256':'rsa-sha2-256',
'RSA-SHA2-512':'rsa-sha2-512',
'ECDSA-SHA2-256':'ecdsa-sha2-nistp256',
'ECDSA-SHA2-384':'ecdsa-sha2-nistp384',
'ECDSA-SHA2-512':'ecdsa-sha2-nistp521',
'EDDSA-ED25519':'ssh-ed25519',
}
sign_map_certs = {
'RSA-SHA1':'ssh-rsa-cert-v01@openssh.com',
'DSA-SHA1':'ssh-dss-cert-v01@openssh.com',
'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-SHA2-384':'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',
}
@classmethod
def generate_config(cls, policy):
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 += 'Ciphers ' + s + '\n'
s = ''
if policy.integers['ssh_etm']:
for i in p['mac']:
try:
s = cls.append(s, cls.mac_map_etm[i], sep)
except KeyError:
pass
for i in p['mac']:
try:
s = cls.append(s, cls.mac_map[i], sep)
except KeyError:
pass
if s:
cfg += 'MACs ' + s + '\n'
s = ''
for kx in p['key_exchange']:
for h in p['hash']:
if policy.integers['arbitrary_dh_groups'] == 1:
try:
val = cls.gx_map[kx + '-' + h]
s = cls.append(s, val, sep)
except KeyError:
pass
for g in p['group']:
try:
val = cls.kx_map[kx + '-' + g + '-' + h]
s = cls.append(s, val, sep)
except KeyError:
pass
if s:
cfg += 'KexAlgorithms ' + s + '\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:
cfg += 'HostKeyAlgorithms ' + s + '\n'
cfg += 'PubkeyAcceptedKeyTypes ' + s + '\n'
return cfg
@classmethod
def test_config(cls, config): # pylint: disable=unused-argument
return True
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