mirror of
https://github.com/jtesta/ssh-audit.git
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Moved built-in policies from external files to internal database. (#75)
This commit is contained in:
Joe Testa
@ -22,7 +22,7 @@
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THE SOFTWARE.
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"""
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from typing import Dict, List, Tuple
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from typing import Optional, Any
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from typing import Optional, Any, Union, cast
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from datetime import date
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from ssh_audit.ssh2_kex import SSH2_Kex # pylint: disable=unused-import
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@ -32,7 +32,49 @@ from ssh_audit.banner import Banner
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# Validates policy files and performs policy testing
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class Policy:
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def __init__(self, policy_file: Optional[str] = None, policy_data: Optional[str] = None) -> None:
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# Each field maps directly to a private member variable of the Policy class.
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BUILTIN_POLICIES = {
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# Ubuntu Server policies
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'Hardened Ubuntu Server 16.04 LTS (version 1)': {'version': '1', 'banner': None, 'compressions': None, 'host_keys': ['ssh-ed25519'], 'optional_host_keys': ['ssh-ed25519-cert-v01@openssh.com', 'rsa-sha2-256-cert-v01@openssh.com', 'rsa-sha2-512-cert-v01@openssh.com'], 'kex': ['curve25519-sha256@libssh.org', 'diffie-hellman-group-exchange-sha256'], 'ciphers': ['chacha20-poly1305@openssh.com', 'aes256-gcm@openssh.com', 'aes128-gcm@openssh.com', 'aes256-ctr', 'aes192-ctr', 'aes128-ctr'], 'macs': ['hmac-sha2-256-etm@openssh.com', 'hmac-sha2-512-etm@openssh.com', 'umac-128-etm@openssh.com'], 'hostkey_sizes': None, 'cakey_sizes': None, 'dh_modulus_sizes': {'diffie-hellman-group-exchange-sha256': 2048}, 'server_policy': True},
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'Hardened Ubuntu Server 18.04 LTS (version 1)': {'version': '1', 'banner': None, 'compressions': None, 'host_keys': ['ssh-ed25519'], 'optional_host_keys': ['ssh-ed25519-cert-v01@openssh.com', 'rsa-sha2-256-cert-v01@openssh.com', 'rsa-sha2-512-cert-v01@openssh.com'], 'kex': ['curve25519-sha256', 'curve25519-sha256@libssh.org', 'diffie-hellman-group16-sha512', 'diffie-hellman-group18-sha512', 'diffie-hellman-group-exchange-sha256'], 'ciphers': ['chacha20-poly1305@openssh.com', 'aes256-gcm@openssh.com', 'aes128-gcm@openssh.com', 'aes256-ctr', 'aes192-ctr', 'aes128-ctr'], 'macs': ['hmac-sha2-256-etm@openssh.com', 'hmac-sha2-512-etm@openssh.com', 'umac-128-etm@openssh.com'], 'hostkey_sizes': None, 'cakey_sizes': None, 'dh_modulus_sizes': {'diffie-hellman-group-exchange-sha256': 2048}, 'server_policy': True},
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'Hardened Ubuntu Server 20.04 LTS (version 1)': {'version': '1', 'banner': None, 'compressions': None, 'host_keys': ['rsa-sha2-512', 'rsa-sha2-256', 'ssh-ed25519'], 'optional_host_keys': ['sk-ssh-ed25519@openssh.com', 'ssh-ed25519-cert-v01@openssh.com', 'sk-ssh-ed25519-cert-v01@openssh.com', 'rsa-sha2-256-cert-v01@openssh.com', 'rsa-sha2-512-cert-v01@openssh.com'], 'kex': ['curve25519-sha256', 'curve25519-sha256@libssh.org', 'diffie-hellman-group16-sha512', 'diffie-hellman-group18-sha512', 'diffie-hellman-group-exchange-sha256'], 'ciphers': ['chacha20-poly1305@openssh.com', 'aes256-gcm@openssh.com', 'aes128-gcm@openssh.com', 'aes256-ctr', 'aes192-ctr', 'aes128-ctr'], 'macs': ['hmac-sha2-256-etm@openssh.com', 'hmac-sha2-512-etm@openssh.com', 'umac-128-etm@openssh.com'], 'hostkey_sizes': {'rsa-sha2-256': 4096, 'rsa-sha2-512': 4096}, 'cakey_sizes': None, 'dh_modulus_sizes': {'diffie-hellman-group-exchange-sha256': 2048}, 'server_policy': True},
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# Generic OpenSSH Server policies
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'Hardened OpenSSH Server v7.7 (version 1)': {'version': '1', 'banner': None, 'compressions': None, 'host_keys': ['ssh-ed25519'], 'optional_host_keys': ['ssh-ed25519-cert-v01@openssh.com', 'rsa-sha2-256-cert-v01@openssh.com', 'rsa-sha2-512-cert-v01@openssh.com'], 'kex': ['curve25519-sha256', 'curve25519-sha256@libssh.org', 'diffie-hellman-group16-sha512', 'diffie-hellman-group18-sha512', 'diffie-hellman-group-exchange-sha256'], 'ciphers': ['chacha20-poly1305@openssh.com', 'aes256-gcm@openssh.com', 'aes128-gcm@openssh.com', 'aes256-ctr', 'aes192-ctr', 'aes128-ctr'], 'macs': ['hmac-sha2-256-etm@openssh.com', 'hmac-sha2-512-etm@openssh.com', 'umac-128-etm@openssh.com'], 'hostkey_sizes': None, 'cakey_sizes': None, 'dh_modulus_sizes': {'diffie-hellman-group-exchange-sha256': 2048}, 'server_policy': True},
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'Hardened OpenSSH Server v7.8 (version 1)': {'version': '1', 'banner': None, 'compressions': None, 'host_keys': ['ssh-ed25519'], 'optional_host_keys': ['ssh-ed25519-cert-v01@openssh.com', 'rsa-sha2-256-cert-v01@openssh.com', 'rsa-sha2-512-cert-v01@openssh.com'], 'kex': ['curve25519-sha256', 'curve25519-sha256@libssh.org', 'diffie-hellman-group16-sha512', 'diffie-hellman-group18-sha512', 'diffie-hellman-group-exchange-sha256'], 'ciphers': ['chacha20-poly1305@openssh.com', 'aes256-gcm@openssh.com', 'aes128-gcm@openssh.com', 'aes256-ctr', 'aes192-ctr', 'aes128-ctr'], 'macs': ['hmac-sha2-256-etm@openssh.com', 'hmac-sha2-512-etm@openssh.com', 'umac-128-etm@openssh.com'], 'hostkey_sizes': None, 'cakey_sizes': None, 'dh_modulus_sizes': {'diffie-hellman-group-exchange-sha256': 2048}, 'server_policy': True},
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'Hardened OpenSSH Server v7.9 (version 1)': {'version': '1', 'banner': None, 'compressions': None, 'host_keys': ['ssh-ed25519'], 'optional_host_keys': ['ssh-ed25519-cert-v01@openssh.com', 'rsa-sha2-256-cert-v01@openssh.com', 'rsa-sha2-512-cert-v01@openssh.com'], 'kex': ['curve25519-sha256', 'curve25519-sha256@libssh.org', 'diffie-hellman-group16-sha512', 'diffie-hellman-group18-sha512', 'diffie-hellman-group-exchange-sha256'], 'ciphers': ['chacha20-poly1305@openssh.com', 'aes256-gcm@openssh.com', 'aes128-gcm@openssh.com', 'aes256-ctr', 'aes192-ctr', 'aes128-ctr'], 'macs': ['hmac-sha2-256-etm@openssh.com', 'hmac-sha2-512-etm@openssh.com', 'umac-128-etm@openssh.com'], 'hostkey_sizes': None, 'cakey_sizes': None, 'dh_modulus_sizes': {'diffie-hellman-group-exchange-sha256': 2048}, 'server_policy': True},
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'Hardened OpenSSH Server v8.0 (version 1)': {'version': '1', 'banner': None, 'compressions': None, 'host_keys': ['ssh-ed25519'], 'optional_host_keys': ['ssh-ed25519-cert-v01@openssh.com', 'rsa-sha2-256-cert-v01@openssh.com', 'rsa-sha2-512-cert-v01@openssh.com'], 'kex': ['curve25519-sha256', 'curve25519-sha256@libssh.org', 'diffie-hellman-group16-sha512', 'diffie-hellman-group18-sha512', 'diffie-hellman-group-exchange-sha256'], 'ciphers': ['chacha20-poly1305@openssh.com', 'aes256-gcm@openssh.com', 'aes128-gcm@openssh.com', 'aes256-ctr', 'aes192-ctr', 'aes128-ctr'], 'macs': ['hmac-sha2-256-etm@openssh.com', 'hmac-sha2-512-etm@openssh.com', 'umac-128-etm@openssh.com'], 'hostkey_sizes': None, 'cakey_sizes': None, 'dh_modulus_sizes': {'diffie-hellman-group-exchange-sha256': 2048}, 'server_policy': True},
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'Hardened OpenSSH Server v8.1 (version 1)': {'version': '1', 'banner': None, 'compressions': None, 'host_keys': ['ssh-ed25519'], 'optional_host_keys': ['sk-ssh-ed25519@openssh.com', 'ssh-ed25519-cert-v01@openssh.com', 'sk-ssh-ed25519-cert-v01@openssh.com', 'rsa-sha2-256-cert-v01@openssh.com', 'rsa-sha2-512-cert-v01@openssh.com'], 'kex': ['curve25519-sha256', 'curve25519-sha256@libssh.org', 'diffie-hellman-group16-sha512', 'diffie-hellman-group18-sha512', 'diffie-hellman-group-exchange-sha256'], 'ciphers': ['chacha20-poly1305@openssh.com', 'aes256-gcm@openssh.com', 'aes128-gcm@openssh.com', 'aes256-ctr', 'aes192-ctr', 'aes128-ctr'], 'macs': ['hmac-sha2-256-etm@openssh.com', 'hmac-sha2-512-etm@openssh.com', 'umac-128-etm@openssh.com'], 'hostkey_sizes': None, 'cakey_sizes': None, 'dh_modulus_sizes': {'diffie-hellman-group-exchange-sha256': 2048}, 'server_policy': True},
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'Hardened OpenSSH Server v8.2 (version 1)': {'version': '1', 'banner': None, 'compressions': None, 'host_keys': ['rsa-sha2-512', 'rsa-sha2-256', 'ssh-ed25519'], 'optional_host_keys': ['sk-ssh-ed25519@openssh.com', 'ssh-ed25519-cert-v01@openssh.com', 'sk-ssh-ed25519-cert-v01@openssh.com', 'rsa-sha2-256-cert-v01@openssh.com', 'rsa-sha2-512-cert-v01@openssh.com'], 'kex': ['curve25519-sha256', 'curve25519-sha256@libssh.org', 'diffie-hellman-group16-sha512', 'diffie-hellman-group18-sha512', 'diffie-hellman-group-exchange-sha256'], 'ciphers': ['chacha20-poly1305@openssh.com', 'aes256-gcm@openssh.com', 'aes128-gcm@openssh.com', 'aes256-ctr', 'aes192-ctr', 'aes128-ctr'], 'macs': ['hmac-sha2-256-etm@openssh.com', 'hmac-sha2-512-etm@openssh.com', 'umac-128-etm@openssh.com'], 'hostkey_sizes': {'rsa-sha2-256': 4096, 'rsa-sha2-512': 4096}, 'cakey_sizes': None, 'dh_modulus_sizes': {'diffie-hellman-group-exchange-sha256': 2048}, 'server_policy': True},
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'Hardened OpenSSH Server v8.3 (version 1)': {'version': '1', 'banner': None, 'compressions': None, 'host_keys': ['rsa-sha2-512', 'rsa-sha2-256', 'ssh-ed25519'], 'optional_host_keys': ['sk-ssh-ed25519@openssh.com', 'ssh-ed25519-cert-v01@openssh.com', 'sk-ssh-ed25519-cert-v01@openssh.com', 'rsa-sha2-256-cert-v01@openssh.com', 'rsa-sha2-512-cert-v01@openssh.com'], 'kex': ['curve25519-sha256', 'curve25519-sha256@libssh.org', 'diffie-hellman-group16-sha512', 'diffie-hellman-group18-sha512', 'diffie-hellman-group-exchange-sha256'], 'ciphers': ['chacha20-poly1305@openssh.com', 'aes256-gcm@openssh.com', 'aes128-gcm@openssh.com', 'aes256-ctr', 'aes192-ctr', 'aes128-ctr'], 'macs': ['hmac-sha2-256-etm@openssh.com', 'hmac-sha2-512-etm@openssh.com', 'umac-128-etm@openssh.com'], 'hostkey_sizes': {'rsa-sha2-256': 4096, 'rsa-sha2-512': 4096}, 'cakey_sizes': None, 'dh_modulus_sizes': {'diffie-hellman-group-exchange-sha256': 2048}, 'server_policy': True},
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'Hardened OpenSSH Server v8.4 (version 1)': {'version': '1', 'banner': None, 'compressions': None, 'host_keys': ['rsa-sha2-512', 'rsa-sha2-256', 'ssh-ed25519'], 'optional_host_keys': ['sk-ssh-ed25519@openssh.com', 'ssh-ed25519-cert-v01@openssh.com', 'sk-ssh-ed25519-cert-v01@openssh.com', 'rsa-sha2-256-cert-v01@openssh.com', 'rsa-sha2-512-cert-v01@openssh.com'], 'kex': ['curve25519-sha256', 'curve25519-sha256@libssh.org', 'diffie-hellman-group16-sha512', 'diffie-hellman-group18-sha512', 'diffie-hellman-group-exchange-sha256'], 'ciphers': ['chacha20-poly1305@openssh.com', 'aes256-gcm@openssh.com', 'aes128-gcm@openssh.com', 'aes256-ctr', 'aes192-ctr', 'aes128-ctr'], 'macs': ['hmac-sha2-256-etm@openssh.com', 'hmac-sha2-512-etm@openssh.com', 'umac-128-etm@openssh.com'], 'hostkey_sizes': {'rsa-sha2-256': 4096, 'rsa-sha2-512': 4096}, 'cakey_sizes': None, 'dh_modulus_sizes': {'diffie-hellman-group-exchange-sha256': 2048}, 'server_policy': True},
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# Ubuntu Client policies
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'Hardened Ubuntu Client 16.04 LTS (version 1)': {'version': '1', 'banner': None, 'compressions': None, 'host_keys': ['ssh-ed25519', 'ssh-ed25519-cert-v01@openssh.com', 'rsa-sha2-256', 'rsa-sha2-512', 'ssh-rsa-cert-v01@openssh.com'], 'optional_host_keys': None, 'kex': ['curve25519-sha256@libssh.org', 'diffie-hellman-group-exchange-sha256', 'ext-info-c'], 'ciphers': ['chacha20-poly1305@openssh.com', 'aes256-gcm@openssh.com', 'aes128-gcm@openssh.com', 'aes256-ctr', 'aes192-ctr', 'aes128-ctr'], 'macs': ['hmac-sha2-256-etm@openssh.com', 'hmac-sha2-512-etm@openssh.com', 'umac-128-etm@openssh.com'], 'hostkey_sizes': None, 'cakey_sizes': None, 'dh_modulus_sizes': None, 'server_policy': False},
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'Hardened Ubuntu Client 18.04 LTS (version 1)': {'version': '1', 'banner': None, 'compressions': None, 'host_keys': ['ssh-ed25519', 'ssh-ed25519-cert-v01@openssh.com', 'rsa-sha2-256', 'rsa-sha2-512', 'ssh-rsa-cert-v01@openssh.com'], 'optional_host_keys': None, 'kex': ['curve25519-sha256', 'curve25519-sha256@libssh.org', 'diffie-hellman-group16-sha512', 'diffie-hellman-group18-sha512', 'diffie-hellman-group-exchange-sha256', 'ext-info-c'], 'ciphers': ['chacha20-poly1305@openssh.com', 'aes256-gcm@openssh.com', 'aes128-gcm@openssh.com', 'aes256-ctr', 'aes192-ctr', 'aes128-ctr'], 'macs': ['hmac-sha2-256-etm@openssh.com', 'hmac-sha2-512-etm@openssh.com', 'umac-128-etm@openssh.com'], 'hostkey_sizes': None, 'cakey_sizes': None, 'dh_modulus_sizes': None, 'server_policy': False},
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'Hardened Ubuntu Client 20.04 LTS (version 1)': {'version': '1', 'banner': None, 'compressions': None, 'host_keys': ['ssh-ed25519', 'ssh-ed25519-cert-v01@openssh.com', 'sk-ssh-ed25519@openssh.com', 'sk-ssh-ed25519-cert-v01@openssh.com', 'rsa-sha2-256', 'rsa-sha2-256-cert-v01@openssh.com', 'rsa-sha2-512', 'rsa-sha2-512-cert-v01@openssh.com', 'ssh-rsa-cert-v01@openssh.com'], 'optional_host_keys': None, 'kex': ['curve25519-sha256', 'curve25519-sha256@libssh.org', 'diffie-hellman-group16-sha512', 'diffie-hellman-group18-sha512', 'diffie-hellman-group-exchange-sha256', 'ext-info-c'], 'ciphers': ['chacha20-poly1305@openssh.com', 'aes256-gcm@openssh.com', 'aes128-gcm@openssh.com', 'aes256-ctr', 'aes192-ctr', 'aes128-ctr'], 'macs': ['hmac-sha2-256-etm@openssh.com', 'hmac-sha2-512-etm@openssh.com', 'umac-128-etm@openssh.com'], 'hostkey_sizes': None, 'cakey_sizes': None, 'dh_modulus_sizes': None, 'server_policy': False},
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} # type: Dict[str, Dict[str, Union[Optional[str], Optional[List[str]], bool, Dict[str, int]]]]
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def __init__(self, policy_file: Optional[str] = None, policy_data: Optional[str] = None, manual_load: bool = False) -> None:
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self._name = None # type: Optional[str]
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self._version = None # type: Optional[str]
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self._banner = None # type: Optional[str]
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@ -47,10 +89,22 @@ class Policy:
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self._dh_modulus_sizes = None # type: Optional[Dict[str, int]]
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self._server_policy = True
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if (policy_file is None) and (policy_data is None):
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raise RuntimeError('policy_file and policy_data must not both be None.')
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elif (policy_file is not None) and (policy_data is not None):
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raise RuntimeError('policy_file and policy_data must not both be specified.')
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self._name_and_version = '' # type: str
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# Ensure that only one mode was specified.
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num_modes = 0
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if policy_file is not None:
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num_modes += 1
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if policy_data is not None:
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num_modes += 1
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if manual_load is True:
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num_modes += 1
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if num_modes != 1:
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raise RuntimeError('Exactly one of the following can be specified only: policy_file, policy_data, or manual_load')
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if manual_load:
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return
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if policy_file is not None:
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with open(policy_file, "r") as f:
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@ -142,6 +196,8 @@ class Policy:
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if self._version is None:
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raise ValueError('The policy does not have a version field.')
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self._name_and_version = "%s (version %s)" % (self._name, self._version)
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@staticmethod
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def _append_error(errors: List[Any], mismatched_field: str, expected_required: Optional[List[str]], expected_optional: Optional[List[str]], actual: List[str]) -> None:
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@ -339,7 +395,7 @@ macs = %s
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def get_name_and_version(self) -> str:
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'''Returns a string of this Policy's name and version.'''
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return '%s (version %s)' % (self._name, self._version)
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return self._name_and_version
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def is_server_policy(self) -> bool:
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@ -347,6 +403,50 @@ macs = %s
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return self._server_policy
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@staticmethod
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def list_builtin_policies() -> Tuple[List[str], List[str]]:
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'''Returns two lists: a list of names of built-in server policies, and a list of names of built-in client policies, respectively.'''
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server_policy_names = []
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client_policy_names = []
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for policy_name in Policy.BUILTIN_POLICIES:
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if Policy.BUILTIN_POLICIES[policy_name]['server_policy']:
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server_policy_names.append(policy_name)
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else:
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client_policy_names.append(policy_name)
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server_policy_names.sort()
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client_policy_names.sort()
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return server_policy_names, client_policy_names
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@staticmethod
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def load_builtin_policy(policy_name: str) -> Optional['Policy']:
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'''Returns a Policy with the specified built-in policy name loaded, or None if no policy of that name exists.'''
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p = None
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if policy_name in Policy.BUILTIN_POLICIES:
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policy_struct = Policy.BUILTIN_POLICIES[policy_name]
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p = Policy(manual_load=True)
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policy_name_without_version = policy_name[0:policy_name.rfind(' (')]
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p._name = policy_name_without_version # pylint: disable=protected-access
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p._version = cast(str, policy_struct['version']) # pylint: disable=protected-access
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p._banner = cast(Optional[str], policy_struct['banner']) # pylint: disable=protected-access
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p._compressions = cast(Optional[List[str]], policy_struct['compressions']) # pylint: disable=protected-access
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p._host_keys = cast(Optional[List[str]], policy_struct['host_keys']) # pylint: disable=protected-access
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p._optional_host_keys = cast(Optional[List[str]], policy_struct['optional_host_keys']) # pylint: disable=protected-access
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p._kex = cast(Optional[List[str]], policy_struct['kex']) # pylint: disable=protected-access
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p._ciphers = cast(Optional[List[str]], policy_struct['ciphers']) # pylint: disable=protected-access
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p._macs = cast(Optional[List[str]], policy_struct['macs']) # pylint: disable=protected-access
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p._hostkey_sizes = cast(Optional[Dict[str, int]], policy_struct['hostkey_sizes']) # pylint: disable=protected-access
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p._cakey_sizes = cast(Optional[Dict[str, int]], policy_struct['cakey_sizes']) # pylint: disable=protected-access
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p._dh_modulus_sizes = cast(Optional[Dict[str, int]], policy_struct['dh_modulus_sizes']) # pylint: disable=protected-access
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p._server_policy = cast(bool, policy_struct['server_policy']) # pylint: disable=protected-access
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p._name_and_version = "%s (version %s)" % (p._name, p._version) # pylint: disable=protected-access
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return p
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@staticmethod
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def _normalize_error_field(field: List[str]) -> Any:
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'''If field is an array with a string parsable as an integer, return that integer. Otherwise, return the field unmodified.'''
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@ -367,9 +467,14 @@ macs = %s
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banner = undefined
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compressions_str = undefined
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host_keys_str = undefined
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optional_host_keys_str = undefined
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kex_str = undefined
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ciphers_str = undefined
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macs_str = undefined
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hostkey_sizes_str = undefined
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cakey_sizes_str = undefined
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dh_modulus_sizes_str = undefined
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if self._name is not None:
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name = '[%s]' % self._name
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@ -382,11 +487,19 @@ macs = %s
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compressions_str = ', '.join(self._compressions)
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if self._host_keys is not None:
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host_keys_str = ', '.join(self._host_keys)
|
||||
if self._optional_host_keys is not None:
|
||||
optional_host_keys_str = ', '.join(self._optional_host_keys)
|
||||
if self._kex is not None:
|
||||
kex_str = ', '.join(self._kex)
|
||||
if self._ciphers is not None:
|
||||
ciphers_str = ', '.join(self._ciphers)
|
||||
if self._macs is not None:
|
||||
macs_str = ', '.join(self._macs)
|
||||
if self._hostkey_sizes is not None:
|
||||
hostkey_sizes_str = str(self._hostkey_sizes)
|
||||
if self._cakey_sizes is not None:
|
||||
cakey_sizes_str = str(self._cakey_sizes)
|
||||
if self._dh_modulus_sizes is not None:
|
||||
dh_modulus_sizes_str = str(self._dh_modulus_sizes)
|
||||
|
||||
return "Name: %s\nVersion: %s\nBanner: %s\nCompressions: %s\nHost Keys: %s\nKey Exchanges: %s\nCiphers: %s\nMACs: %s" % (name, version, banner, compressions_str, host_keys_str, kex_str, ciphers_str, macs_str)
|
||||
return "Name: %s\nVersion: %s\nBanner: %s\nCompressions: %s\nHost Keys: %s\nOptional Host Keys: %s\nKey Exchanges: %s\nCiphers: %s\nMACs: %s\nHost Key Sizes: %s\nCA Key Sizes: %s\nDH Modulus Sizes: %s\nServer Policy: %r" % (name, version, banner, compressions_str, host_keys_str, optional_host_keys_str, kex_str, ciphers_str, macs_str, hostkey_sizes_str, cakey_sizes_str, dh_modulus_sizes_str, self._server_policy)
|
||||
|
||||
Reference in New Issue
Block a user