mirror of
https://github.com/MISP/misp-galaxy.git
synced 2024-11-26 16:57:18 +00:00
281 lines
11 KiB
Python
281 lines
11 KiB
Python
from typing import TYPE_CHECKING, Any, Dict, Optional, Tuple, Union
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from redis.exceptions import RedisError, ResponseError
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from redis.utils import str_if_bytes
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if TYPE_CHECKING:
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from redis.asyncio.cluster import ClusterNode
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class AbstractCommandsParser:
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def _get_pubsub_keys(self, *args):
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"""
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Get the keys from pubsub command.
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Although PubSub commands have predetermined key locations, they are not
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supported in the 'COMMAND's output, so the key positions are hardcoded
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in this method
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"""
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if len(args) < 2:
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# The command has no keys in it
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return None
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args = [str_if_bytes(arg) for arg in args]
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command = args[0].upper()
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keys = None
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if command == "PUBSUB":
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# the second argument is a part of the command name, e.g.
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# ['PUBSUB', 'NUMSUB', 'foo'].
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pubsub_type = args[1].upper()
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if pubsub_type in ["CHANNELS", "NUMSUB", "SHARDCHANNELS", "SHARDNUMSUB"]:
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keys = args[2:]
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elif command in ["SUBSCRIBE", "PSUBSCRIBE", "UNSUBSCRIBE", "PUNSUBSCRIBE"]:
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# format example:
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# SUBSCRIBE channel [channel ...]
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keys = list(args[1:])
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elif command in ["PUBLISH", "SPUBLISH"]:
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# format example:
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# PUBLISH channel message
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keys = [args[1]]
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return keys
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def parse_subcommand(self, command, **options):
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cmd_dict = {}
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cmd_name = str_if_bytes(command[0])
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cmd_dict["name"] = cmd_name
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cmd_dict["arity"] = int(command[1])
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cmd_dict["flags"] = [str_if_bytes(flag) for flag in command[2]]
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cmd_dict["first_key_pos"] = command[3]
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cmd_dict["last_key_pos"] = command[4]
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cmd_dict["step_count"] = command[5]
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if len(command) > 7:
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cmd_dict["tips"] = command[7]
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cmd_dict["key_specifications"] = command[8]
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cmd_dict["subcommands"] = command[9]
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return cmd_dict
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class CommandsParser(AbstractCommandsParser):
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"""
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Parses Redis commands to get command keys.
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COMMAND output is used to determine key locations.
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Commands that do not have a predefined key location are flagged with
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'movablekeys', and these commands' keys are determined by the command
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'COMMAND GETKEYS'.
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"""
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def __init__(self, redis_connection):
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self.commands = {}
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self.initialize(redis_connection)
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def initialize(self, r):
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commands = r.command()
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uppercase_commands = []
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for cmd in commands:
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if any(x.isupper() for x in cmd):
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uppercase_commands.append(cmd)
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for cmd in uppercase_commands:
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commands[cmd.lower()] = commands.pop(cmd)
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self.commands = commands
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# As soon as this PR is merged into Redis, we should reimplement
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# our logic to use COMMAND INFO changes to determine the key positions
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# https://github.com/redis/redis/pull/8324
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def get_keys(self, redis_conn, *args):
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"""
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Get the keys from the passed command.
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NOTE: Due to a bug in redis<7.0, this function does not work properly
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for EVAL or EVALSHA when the `numkeys` arg is 0.
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- issue: https://github.com/redis/redis/issues/9493
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- fix: https://github.com/redis/redis/pull/9733
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So, don't use this function with EVAL or EVALSHA.
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"""
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if len(args) < 2:
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# The command has no keys in it
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return None
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cmd_name = args[0].lower()
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if cmd_name not in self.commands:
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# try to split the command name and to take only the main command,
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# e.g. 'memory' for 'memory usage'
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cmd_name_split = cmd_name.split()
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cmd_name = cmd_name_split[0]
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if cmd_name in self.commands:
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# save the splitted command to args
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args = cmd_name_split + list(args[1:])
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else:
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# We'll try to reinitialize the commands cache, if the engine
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# version has changed, the commands may not be current
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self.initialize(redis_conn)
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if cmd_name not in self.commands:
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raise RedisError(
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f"{cmd_name.upper()} command doesn't exist in Redis commands"
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)
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command = self.commands.get(cmd_name)
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if "movablekeys" in command["flags"]:
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keys = self._get_moveable_keys(redis_conn, *args)
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elif "pubsub" in command["flags"] or command["name"] == "pubsub":
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keys = self._get_pubsub_keys(*args)
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else:
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if (
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command["step_count"] == 0
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and command["first_key_pos"] == 0
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and command["last_key_pos"] == 0
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):
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is_subcmd = False
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if "subcommands" in command:
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subcmd_name = f"{cmd_name}|{args[1].lower()}"
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for subcmd in command["subcommands"]:
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if str_if_bytes(subcmd[0]) == subcmd_name:
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command = self.parse_subcommand(subcmd)
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is_subcmd = True
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# The command doesn't have keys in it
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if not is_subcmd:
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return None
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last_key_pos = command["last_key_pos"]
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if last_key_pos < 0:
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last_key_pos = len(args) - abs(last_key_pos)
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keys_pos = list(
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range(command["first_key_pos"], last_key_pos + 1, command["step_count"])
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)
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keys = [args[pos] for pos in keys_pos]
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return keys
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def _get_moveable_keys(self, redis_conn, *args):
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"""
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NOTE: Due to a bug in redis<7.0, this function does not work properly
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for EVAL or EVALSHA when the `numkeys` arg is 0.
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- issue: https://github.com/redis/redis/issues/9493
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- fix: https://github.com/redis/redis/pull/9733
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So, don't use this function with EVAL or EVALSHA.
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"""
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# The command name should be splitted into separate arguments,
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# e.g. 'MEMORY USAGE' will be splitted into ['MEMORY', 'USAGE']
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pieces = args[0].split() + list(args[1:])
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try:
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keys = redis_conn.execute_command("COMMAND GETKEYS", *pieces)
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except ResponseError as e:
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message = e.__str__()
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if (
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"Invalid arguments" in message
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or "The command has no key arguments" in message
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):
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return None
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else:
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raise e
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return keys
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class AsyncCommandsParser(AbstractCommandsParser):
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"""
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Parses Redis commands to get command keys.
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COMMAND output is used to determine key locations.
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Commands that do not have a predefined key location are flagged with 'movablekeys',
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and these commands' keys are determined by the command 'COMMAND GETKEYS'.
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NOTE: Due to a bug in redis<7.0, this does not work properly
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for EVAL or EVALSHA when the `numkeys` arg is 0.
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- issue: https://github.com/redis/redis/issues/9493
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- fix: https://github.com/redis/redis/pull/9733
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So, don't use this with EVAL or EVALSHA.
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"""
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__slots__ = ("commands", "node")
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def __init__(self) -> None:
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self.commands: Dict[str, Union[int, Dict[str, Any]]] = {}
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async def initialize(self, node: Optional["ClusterNode"] = None) -> None:
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if node:
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self.node = node
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commands = await self.node.execute_command("COMMAND")
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self.commands = {cmd.lower(): command for cmd, command in commands.items()}
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# As soon as this PR is merged into Redis, we should reimplement
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# our logic to use COMMAND INFO changes to determine the key positions
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# https://github.com/redis/redis/pull/8324
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async def get_keys(self, *args: Any) -> Optional[Tuple[str, ...]]:
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"""
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Get the keys from the passed command.
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NOTE: Due to a bug in redis<7.0, this function does not work properly
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for EVAL or EVALSHA when the `numkeys` arg is 0.
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- issue: https://github.com/redis/redis/issues/9493
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- fix: https://github.com/redis/redis/pull/9733
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So, don't use this function with EVAL or EVALSHA.
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"""
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if len(args) < 2:
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# The command has no keys in it
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return None
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cmd_name = args[0].lower()
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if cmd_name not in self.commands:
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# try to split the command name and to take only the main command,
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# e.g. 'memory' for 'memory usage'
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cmd_name_split = cmd_name.split()
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cmd_name = cmd_name_split[0]
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if cmd_name in self.commands:
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# save the splitted command to args
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args = cmd_name_split + list(args[1:])
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else:
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# We'll try to reinitialize the commands cache, if the engine
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# version has changed, the commands may not be current
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await self.initialize()
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if cmd_name not in self.commands:
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raise RedisError(
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f"{cmd_name.upper()} command doesn't exist in Redis commands"
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)
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command = self.commands.get(cmd_name)
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if "movablekeys" in command["flags"]:
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keys = await self._get_moveable_keys(*args)
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elif "pubsub" in command["flags"] or command["name"] == "pubsub":
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keys = self._get_pubsub_keys(*args)
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else:
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if (
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command["step_count"] == 0
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and command["first_key_pos"] == 0
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and command["last_key_pos"] == 0
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):
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is_subcmd = False
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if "subcommands" in command:
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subcmd_name = f"{cmd_name}|{args[1].lower()}"
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for subcmd in command["subcommands"]:
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if str_if_bytes(subcmd[0]) == subcmd_name:
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command = self.parse_subcommand(subcmd)
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is_subcmd = True
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# The command doesn't have keys in it
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if not is_subcmd:
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return None
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last_key_pos = command["last_key_pos"]
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if last_key_pos < 0:
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last_key_pos = len(args) - abs(last_key_pos)
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keys_pos = list(
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range(command["first_key_pos"], last_key_pos + 1, command["step_count"])
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)
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keys = [args[pos] for pos in keys_pos]
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return keys
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async def _get_moveable_keys(self, *args: Any) -> Optional[Tuple[str, ...]]:
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try:
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keys = await self.node.execute_command("COMMAND GETKEYS", *args)
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except ResponseError as e:
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message = e.__str__()
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if (
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"Invalid arguments" in message
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or "The command has no key arguments" in message
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):
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return None
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else:
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raise e
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return keys
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