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huawei.py
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huawei.py
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import datetime
import itertools
from aerleon.lib import aclgenerator # type: ignore
from aerleon.lib import nacaddr # type: ignore
from aerleon.lib import plugin # type: ignore
from aerleon.lib import policy # type: ignore
class Error(Exception):
"""Generic error class."""
class FilterNameLengthError(Error):
"""Raised when filter name is too long."""
ANY_PORT = (0, 65535)
ANY_IP = nacaddr.IPv4("0.0.0.0/0", token="ANY")
class Term(aclgenerator.Term):
"""A single Huawei ACL Term."""
def __init__(self, term: policy.Term):
"""Converts an model policy into an Huawei policy."""
super().__init__(term)
self.term = term
if len(self.term.source_address) == 0:
self.term.source_address = [ANY_IP]
if len(self.term.destination_address) == 0:
self.term.source_address = [ANY_IP]
if len(self.term.source_port) == 0:
self.term.source_port = [ANY_PORT]
if len(self.term.destination_port) == 0:
self.term.destination_port = [ANY_PORT]
if "accept" in self.term.action:
self.term.action = ["permit"]
elif "deny" in self.term.action:
self.term.action = ["deny"]
def __str__(self):
"""Prints out a term as a string."""
term_str = []
rules = itertools.product(
self.term.source_address,
self.term.source_port,
self.term.destination_address,
self.term.destination_port,
self.term.protocol,
)
for src_ip, src_port, dst_ip, dst_port, proto in rules:
rule_str = [self.term.action[0], proto]
rule_str.extend(self._AddressStr(src_ip, "source"))
rule_str.extend(self._PortStr(src_port, "source-port"))
rule_str.extend(self._AddressStr(dst_ip, "destination"))
rule_str.extend(self._PortStr(dst_port, "destination-port"))
term_str.append(" ".join(rule_str))
return "\n".join(term_str)
@staticmethod
def _AddressStr(addr, direction):
addr_str = [direction]
if addr == ANY_IP:
addr_str.append("any")
else:
addr_str.append(str(addr.network_address))
if addr.prefixlen == 32:
addr_str.append("255.255.255.255")
else:
addr_str.append(str(addr.netmask))
return addr_str
@staticmethod
def _PortStr(port, direction):
if port[0] == 0 and port[1] == 65535:
return ''
port_str = [direction]
if port[0] != port[1]:
port_str.append(f"range {port[0]} {port[1]}")
else:
port_str.append(f"eq {port[0]}")
return port_str
class Huawei(aclgenerator.ACLGenerator):
"""A Huawei policy object."""
_PLATFORM = "huawei"
SUFFIX = ".hua"
MAX_RULE_NUM = 4294967294
def _TranslatePolicy(self, pol, exp_info):
self.policies = []
current_date = datetime.datetime.utcnow().date()
exp_info_date = current_date + datetime.timedelta(weeks=exp_info)
for header, terms in pol.filters:
if self._PLATFORM not in header.platforms:
continue
header.filter_options = header.FilterOptions(self._PLATFORM)
header.filter_name = header.FilterName(self._PLATFORM)
if len(header.filter_name) > 127:
raise FilterNameLengthError(
f"Filter name cannot exceed 127 characters, filter name is {len(header.filter_name)} characters"
)
header.filter_type = "advance"
header.step_increment = 10
header.comment = "".join(header.comment)
if len(header.comment) > 127:
header.comment = header.comment[:127]
# TODO(rankeny): What will we use for logging instead of absl?
hp_terms = []
for term in terms:
hp_terms.append(Term(term))
self.policies.append((header, hp_terms))
@staticmethod
def _HeaderStr(header):
acl_header = ''
if header.filter_name.isdigit():
acl_header = f"undo acl {header.filter_name}\nacl {header.filter_name}"
else:
acl_header = f"undo acl name {header.filter_name}\nacl name {header.filter_name} {header.filter_type}"
acl_header = f"{acl_header}\ndescription {header.comment}\nstep {header.step_increment}"
return acl_header
def __str__(self):
acl = []
for header, terms in self.policies:
acl.append(self._HeaderStr(header))
for term in terms:
acl.append(str(term))
return "\n".join(acl)
class HuaweiPlugin(plugin.BasePlugin):
def __init__(self):
pass
def RequestMetadata(self, _platformMetadata):
return plugin.PluginMetadata(capabilities=[plugin.PluginCapability.GENERATOR])
@property
def generators(self):
return {"huawei": Huawei}