85 lines
2.8 KiB
Python
85 lines
2.8 KiB
Python
# pyruse is intended as a replacement to both fail2ban and epylog
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# Copyright © 2017–2018 Y. Gablin
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# Full licensing information in the LICENSE file, or gnu.org/licences/gpl-3.0.txt if the file is missing.
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import datetime
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import json
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import os
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import subprocess
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from pyruse import base, config
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class Action(base.Action):
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_storage = config.Config().asMap().get("storage", "/var/lib/pyruse") \
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+ "/" + os.path.basename(__file__) + ".json"
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_nft = config.Config().asMap().get("nftBan", {}).get("nft", ["/usr/bin/nft"])
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def __init__(self, args):
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super().__init__()
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self.ipv4Set = args["nftSetIPv4"]
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self.ipv6Set = args["nftSetIPv6"]
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self.field = args["IP"]
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self.banSeconds = args.get("banSeconds", None)
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def act(self, entry):
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ip = entry[self.field]
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nftSet = self.ipv6Set if ":" in ip else self.ipv4Set
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newBan = {"IP": ip, "nftSet": nftSet}
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now = datetime.datetime.utcnow()
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bans = []
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previousTS = None
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try:
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with open(Action._storage) as dataFile:
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for ban in json.load(dataFile):
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if ban["timestamp"] <= now.timestamp():
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continue
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elif {k: ban[k] for k in newBan.keys()} == newBan:
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# should not happen, since the IP is banned…
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previousTS = ban["timestamp"]
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else:
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bans.append(ban)
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except IOError:
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pass # new file
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if previousTS:
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cmd = list(Action._nft)
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cmd.append("delete element %s {%s}" % (nftSet, ip))
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subprocess.run(cmd)
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until = self._doBan(now, ip, nftSet)
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newBan["timestamp"] = until.timestamp()
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bans.append(newBan)
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with open(Action._storage, "w") as dataFile:
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json.dump(bans, dataFile)
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def boot(self):
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now = datetime.datetime.utcnow()
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bans = []
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try:
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with open(Action._storage) as dataFile:
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for ban in json.load(dataFile):
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if ban["timestamp"] <= now.timestamp():
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continue
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else:
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bans.append(ban)
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self._doBan(now, ip, nftSet)
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except IOError:
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pass # no file
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with open(Action._storage, "w") as dataFile:
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json.dump(bans, dataFile)
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def _doBan(self, now, ip, nftSet):
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if self.banSeconds:
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until = now + datetime.timedelta(seconds = self.banSeconds)
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timeout = " timeout %ss" % str(self.banSeconds)
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else:
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until = now + datetime.timedelta(days = 365)
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timeout = ""
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cmd = list(Action._nft)
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cmd.append("add element %s {%s%s}" % (nftSet, ip, timeout))
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subprocess.run(cmd)
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return until
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