Merge pull request #5585 from mailcow/feat/nftables
[Netfilter] add nftables support
This commit is contained in:
Patrick Schult
GitHub
commit
3498d4b9c5
@ -1,6 +1,8 @@
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FROM alpine:3.17
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LABEL maintainer "The Infrastructure Company GmbH <info@servercow.de>"
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WORKDIR /app
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ENV XTABLES_LIBDIR /usr/lib/xtables
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ENV PYTHON_IPTABLES_XTABLES_VERSION 12
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ENV IPTABLES_LIBDIR /usr/lib
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@ -14,10 +16,13 @@ RUN apk add --virtual .build-deps \
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iptables \
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ip6tables \
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xtables-addons \
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nftables \
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tzdata \
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py3-pip \
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py3-nftables \
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musl-dev \
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&& pip3 install --ignore-installed --upgrade pip \
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jsonschema \
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python-iptables \
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redis \
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ipaddress \
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@ -26,5 +31,10 @@ RUN apk add --virtual .build-deps \
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# && pip3 install --upgrade pip python-iptables==0.13.0 redis ipaddress dnspython \
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COPY server.py /
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CMD ["python3", "-u", "/server.py"]
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COPY modules /app/modules
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COPY main.py /app/
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COPY ./docker-entrypoint.sh /app/
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RUN chmod +x /app/docker-entrypoint.sh
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CMD ["/bin/sh", "-c", "/app/docker-entrypoint.sh"]
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29
data/Dockerfiles/netfilter/docker-entrypoint.sh
Executable file
29
data/Dockerfiles/netfilter/docker-entrypoint.sh
Executable file
@ -0,0 +1,29 @@
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#!/bin/sh
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backend=iptables
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nft list table ip filter &>/dev/null
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nftables_found=$?
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iptables -L -n &>/dev/null
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iptables_found=$?
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if [ $nftables_found -lt $iptables_found ]; then
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backend=nftables
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fi
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if [ $nftables_found -gt $iptables_found ]; then
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backend=iptables
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fi
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if [ $nftables_found -eq 0 ] && [ $nftables_found -eq $iptables_found ]; then
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nftables_lines=$(nft list ruleset | wc -l)
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iptables_lines=$(iptables-save | wc -l)
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if [ $nftables_lines -gt $iptables_lines ]; then
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backend=nftables
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else
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backend=iptables
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fi
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fi
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exec python -u /app/main.py $backend
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File diff suppressed because it is too large
Load Diff
213
data/Dockerfiles/netfilter/modules/IPTables.py
Normal file
213
data/Dockerfiles/netfilter/modules/IPTables.py
Normal file
@ -0,0 +1,213 @@
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import iptc
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import time
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class IPTables:
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def __init__(self, chain_name, logger):
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self.chain_name = chain_name
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self.logger = logger
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def initChainIPv4(self):
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if not iptc.Chain(iptc.Table(iptc.Table.FILTER), self.chain_name) in iptc.Table(iptc.Table.FILTER).chains:
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iptc.Table(iptc.Table.FILTER).create_chain(self.chain_name)
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for c in ['FORWARD', 'INPUT']:
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chain = iptc.Chain(iptc.Table(iptc.Table.FILTER), c)
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rule = iptc.Rule()
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rule.src = '0.0.0.0/0'
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rule.dst = '0.0.0.0/0'
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target = iptc.Target(rule, self.chain_name)
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rule.target = target
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if rule not in chain.rules:
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chain.insert_rule(rule)
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def initChainIPv6(self):
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if not iptc.Chain(iptc.Table6(iptc.Table6.FILTER), self.chain_name) in iptc.Table6(iptc.Table6.FILTER).chains:
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iptc.Table6(iptc.Table6.FILTER).create_chain(self.chain_name)
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for c in ['FORWARD', 'INPUT']:
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chain = iptc.Chain(iptc.Table6(iptc.Table6.FILTER), c)
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rule = iptc.Rule6()
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rule.src = '::/0'
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rule.dst = '::/0'
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target = iptc.Target(rule, self.chain_name)
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rule.target = target
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if rule not in chain.rules:
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chain.insert_rule(rule)
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def checkIPv4ChainOrder(self):
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filter_table = iptc.Table(iptc.Table.FILTER)
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filter_table.refresh()
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return self.checkChainOrder(filter_table)
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def checkIPv6ChainOrder(self):
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filter_table = iptc.Table6(iptc.Table6.FILTER)
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filter_table.refresh()
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return self.checkChainOrder(filter_table)
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def checkChainOrder(self, filter_table):
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err = False
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exit_code = None
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forward_chain = iptc.Chain(filter_table, 'FORWARD')
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input_chain = iptc.Chain(filter_table, 'INPUT')
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for chain in [forward_chain, input_chain]:
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target_found = False
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for position, item in enumerate(chain.rules):
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if item.target.name == self.chain_name:
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target_found = True
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if position > 2:
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self.logger.logCrit('Error in %s chain: %s target not found, restarting container' % (chain.name, self.chain_name))
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err = True
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exit_code = 2
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if not target_found:
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self.logger.logCrit('Error in %s chain: %s target not found, restarting container' % (chain.name, self.chain_name))
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err = True
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exit_code = 2
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return err, exit_code
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def clearIPv4Table(self):
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self.clearTable(iptc.Table(iptc.Table.FILTER))
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def clearIPv6Table(self):
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self.clearTable(iptc.Table6(iptc.Table6.FILTER))
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def clearTable(self, filter_table):
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filter_table.autocommit = False
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forward_chain = iptc.Chain(filter_table, "FORWARD")
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input_chain = iptc.Chain(filter_table, "INPUT")
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mailcow_chain = iptc.Chain(filter_table, self.chain_name)
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if mailcow_chain in filter_table.chains:
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for rule in mailcow_chain.rules:
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mailcow_chain.delete_rule(rule)
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for rule in forward_chain.rules:
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if rule.target.name == self.chain_name:
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forward_chain.delete_rule(rule)
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for rule in input_chain.rules:
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if rule.target.name == self.chain_name:
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input_chain.delete_rule(rule)
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filter_table.delete_chain(self.chain_name)
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filter_table.commit()
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filter_table.refresh()
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filter_table.autocommit = True
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def banIPv4(self, source):
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chain = iptc.Chain(iptc.Table(iptc.Table.FILTER), self.chain_name)
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rule = iptc.Rule()
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rule.src = source
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target = iptc.Target(rule, "REJECT")
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rule.target = target
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if rule in chain.rules:
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return False
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chain.insert_rule(rule)
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return True
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def banIPv6(self, source):
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chain = iptc.Chain(iptc.Table6(iptc.Table6.FILTER), self.chain_name)
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rule = iptc.Rule6()
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rule.src = source
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target = iptc.Target(rule, "REJECT")
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rule.target = target
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if rule in chain.rules:
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return False
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chain.insert_rule(rule)
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return True
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def unbanIPv4(self, source):
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chain = iptc.Chain(iptc.Table(iptc.Table.FILTER), self.chain_name)
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rule = iptc.Rule()
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rule.src = source
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target = iptc.Target(rule, "REJECT")
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rule.target = target
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if rule not in chain.rules:
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return False
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chain.delete_rule(rule)
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return True
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def unbanIPv6(self, source):
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chain = iptc.Chain(iptc.Table6(iptc.Table6.FILTER), self.chain_name)
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rule = iptc.Rule6()
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rule.src = source
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target = iptc.Target(rule, "REJECT")
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rule.target = target
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if rule not in chain.rules:
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return False
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chain.delete_rule(rule)
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return True
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def snat4(self, snat_target, source):
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try:
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table = iptc.Table('nat')
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table.refresh()
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chain = iptc.Chain(table, 'POSTROUTING')
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table.autocommit = False
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new_rule = self.getSnat4Rule(snat_target, source)
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if not chain.rules:
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# if there are no rules in the chain, insert the new rule directly
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self.logger.logInfo(f'Added POSTROUTING rule for source network {new_rule.src} to SNAT target {snat_target}')
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chain.insert_rule(new_rule)
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else:
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for position, rule in enumerate(chain.rules):
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if not hasattr(rule.target, 'parameter'):
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continue
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match = all((
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new_rule.get_src() == rule.get_src(),
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new_rule.get_dst() == rule.get_dst(),
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new_rule.target.parameters == rule.target.parameters,
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new_rule.target.name == rule.target.name
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))
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if position == 0:
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if not match:
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self.logger.logInfo(f'Added POSTROUTING rule for source network {new_rule.src} to SNAT target {snat_target}')
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chain.insert_rule(new_rule)
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else:
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if match:
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self.logger.logInfo(f'Remove rule for source network {new_rule.src} to SNAT target {snat_target} from POSTROUTING chain at position {position}')
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chain.delete_rule(rule)
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table.commit()
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table.autocommit = True
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return True
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except:
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self.logger.logCrit('Error running SNAT4, retrying...')
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return False
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def snat6(self, snat_target, source):
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try:
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table = iptc.Table6('nat')
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table.refresh()
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chain = iptc.Chain(table, 'POSTROUTING')
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table.autocommit = False
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new_rule = self.getSnat6Rule(snat_target, source)
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if new_rule not in chain.rules:
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self.logger.logInfo('Added POSTROUTING rule for source network %s to SNAT target %s' % (new_rule.src, snat_target))
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chain.insert_rule(new_rule)
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else:
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for position, item in enumerate(chain.rules):
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if item == new_rule:
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if position != 0:
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chain.delete_rule(new_rule)
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table.commit()
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table.autocommit = True
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except:
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self.logger.logCrit('Error running SNAT6, retrying...')
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def getSnat4Rule(self, snat_target, source):
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rule = iptc.Rule()
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rule.src = source
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rule.dst = '!' + rule.src
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target = rule.create_target("SNAT")
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target.to_source = snat_target
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match = rule.create_match("comment")
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match.comment = f'{int(round(time.time()))}'
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return rule
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def getSnat6Rule(self, snat_target, source):
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rule = iptc.Rule6()
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rule.src = source
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rule.dst = '!' + rule.src
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target = rule.create_target("SNAT")
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target.to_source = snat_target
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return rule
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23
data/Dockerfiles/netfilter/modules/Logger.py
Normal file
23
data/Dockerfiles/netfilter/modules/Logger.py
Normal file
@ -0,0 +1,23 @@
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import time
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import json
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class Logger:
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def __init__(self, redis):
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self.r = redis
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def log(self, priority, message):
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tolog = {}
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tolog['time'] = int(round(time.time()))
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tolog['priority'] = priority
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tolog['message'] = message
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self.r.lpush('NETFILTER_LOG', json.dumps(tolog, ensure_ascii=False))
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print(message)
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def logWarn(self, message):
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self.log('warn', message)
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def logCrit(self, message):
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self.log('crit', message)
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def logInfo(self, message):
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self.log('info', message)
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495
data/Dockerfiles/netfilter/modules/NFTables.py
Normal file
495
data/Dockerfiles/netfilter/modules/NFTables.py
Normal file
@ -0,0 +1,495 @@
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import nftables
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import ipaddress
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class NFTables:
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def __init__(self, chain_name, logger):
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self.chain_name = chain_name
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self.logger = logger
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self.nft = nftables.Nftables()
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self.nft.set_json_output(True)
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self.nft.set_handle_output(True)
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self.nft_chain_names = {'ip': {'filter': {'input': '', 'forward': ''}, 'nat': {'postrouting': ''} },
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'ip6': {'filter': {'input': '', 'forward': ''}, 'nat': {'postrouting': ''} } }
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self.search_current_chains()
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def initChainIPv4(self):
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self.insert_mailcow_chains("ip")
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def initChainIPv6(self):
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self.insert_mailcow_chains("ip6")
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def checkIPv4ChainOrder(self):
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return self.checkChainOrder("ip")
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def checkIPv6ChainOrder(self):
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return self.checkChainOrder("ip6")
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def checkChainOrder(self, filter_table):
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err = False
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exit_code = None
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for chain in ['input', 'forward']:
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chain_position = self.check_mailcow_chains(filter_table, chain)
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if chain_position is None: continue
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if chain_position is False:
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self.logger.logCrit(f'MAILCOW target not found in {filter_table} {chain} table, restarting container to fix it...')
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err = True
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exit_code = 2
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if chain_position > 0:
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self.logger.logCrit(f'MAILCOW target is in position {chain_position} in the {filter_table} {chain} table, restarting container to fix it...')
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err = True
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exit_code = 2
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return err, exit_code
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def clearIPv4Table(self):
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self.clearTable("ip")
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def clearIPv6Table(self):
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self.clearTable("ip6")
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def clearTable(self, _family):
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is_empty_dict = True
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json_command = self.get_base_dict()
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chain_handle = self.get_chain_handle(_family, "filter", self.chain_name)
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# if no handle, the chain doesn't exists
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if chain_handle is not None:
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is_empty_dict = False
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# flush chain
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mailcow_chain = {'family': _family, 'table': 'filter', 'name': self.chain_name}
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flush_chain = {'flush': {'chain': mailcow_chain}}
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json_command["nftables"].append(flush_chain)
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# remove rule in forward chain
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# remove rule in input chain
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chains_family = [self.nft_chain_names[_family]['filter']['input'],
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self.nft_chain_names[_family]['filter']['forward'] ]
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for chain_base in chains_family:
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if not chain_base: continue
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rules_handle = self.get_rules_handle(_family, "filter", chain_base)
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if rules_handle is not None:
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for r_handle in rules_handle:
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is_empty_dict = False
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mailcow_rule = {'family':_family,
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'table': 'filter',
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'chain': chain_base,
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'handle': r_handle }
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delete_rules = {'delete': {'rule': mailcow_rule} }
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json_command["nftables"].append(delete_rules)
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# remove chain
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# after delete all rules referencing this chain
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if chain_handle is not None:
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mc_chain_handle = {'family':_family,
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'table': 'filter',
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'name': self.chain_name,
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'handle': chain_handle }
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delete_chain = {'delete': {'chain': mc_chain_handle} }
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json_command["nftables"].append(delete_chain)
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if is_empty_dict == False:
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if self.nft_exec_dict(json_command):
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self.logger.logInfo(f"Clear completed: {_family}")
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def banIPv4(self, source):
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ban_dict = self.get_ban_ip_dict(source, "ip")
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return self.nft_exec_dict(ban_dict)
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def banIPv6(self, source):
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ban_dict = self.get_ban_ip_dict(source, "ip6")
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return self.nft_exec_dict(ban_dict)
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def unbanIPv4(self, source):
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unban_dict = self.get_unban_ip_dict(source, "ip")
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if not unban_dict:
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return False
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return self.nft_exec_dict(unban_dict)
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def unbanIPv6(self, source):
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unban_dict = self.get_unban_ip_dict(source, "ip6")
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if not unban_dict:
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return False
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return self.nft_exec_dict(unban_dict)
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def snat4(self, snat_target, source):
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self.snat_rule("ip", snat_target, source)
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def snat6(self, snat_target, source):
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self.snat_rule("ip6", snat_target, source)
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def nft_exec_dict(self, query: dict):
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if not query: return False
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rc, output, error = self.nft.json_cmd(query)
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if rc != 0:
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#self.logger.logCrit(f"Nftables Error: {error}")
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return False
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# Prevent returning False or empty string on commands that do not produce output
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if rc == 0 and len(output) == 0:
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return True
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return output
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def get_base_dict(self):
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return {'nftables': [{ 'metainfo': { 'json_schema_version': 1} } ] }
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def search_current_chains(self):
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nft_chain_priority = {'ip': {'filter': {'input': None, 'forward': None}, 'nat': {'postrouting': None} },
|
||||
'ip6': {'filter': {'input': None, 'forward': None}, 'nat': {'postrouting': None} } }
|
||||
|
||||
# Command: 'nft list chains'
|
||||
_list = {'list' : {'chains': 'null'} }
|
||||
command = self.get_base_dict()
|
||||
command['nftables'].append(_list)
|
||||
kernel_ruleset = self.nft_exec_dict(command)
|
||||
if kernel_ruleset:
|
||||
for _object in kernel_ruleset['nftables']:
|
||||
chain = _object.get("chain")
|
||||
if not chain: continue
|
||||
|
||||
_family = chain['family']
|
||||
_table = chain['table']
|
||||
_hook = chain.get("hook")
|
||||
_priority = chain.get("prio")
|
||||
_name = chain['name']
|
||||
|
||||
if _family not in self.nft_chain_names: continue
|
||||
if _table not in self.nft_chain_names[_family]: continue
|
||||
if _hook not in self.nft_chain_names[_family][_table]: continue
|
||||
if _priority is None: continue
|
||||
|
||||
_saved_priority = nft_chain_priority[_family][_table][_hook]
|
||||
if _saved_priority is None or _priority < _saved_priority:
|
||||
# at this point, we know the chain has:
|
||||
# hook and priority set
|
||||
# and it has the lowest priority
|
||||
nft_chain_priority[_family][_table][_hook] = _priority
|
||||
self.nft_chain_names[_family][_table][_hook] = _name
|
||||
|
||||
def search_for_chain(self, kernel_ruleset: dict, chain_name: str):
|
||||
found = False
|
||||
for _object in kernel_ruleset["nftables"]:
|
||||
chain = _object.get("chain")
|
||||
if not chain:
|
||||
continue
|
||||
ch_name = chain.get("name")
|
||||
if ch_name == chain_name:
|
||||
found = True
|
||||
break
|
||||
return found
|
||||
|
||||
def get_chain_dict(self, _family: str, _name: str):
|
||||
# nft (add | create) chain [<family>] <table> <name>
|
||||
_chain_opts = {'family': _family, 'table': 'filter', 'name': _name }
|
||||
_add = {'add': {'chain': _chain_opts} }
|
||||
final_chain = self.get_base_dict()
|
||||
final_chain["nftables"].append(_add)
|
||||
return final_chain
|
||||
|
||||
def get_mailcow_jump_rule_dict(self, _family: str, _chain: str):
|
||||
_jump_rule = self.get_base_dict()
|
||||
_expr_opt=[]
|
||||
_expr_counter = {'family': _family, 'table': 'filter', 'packets': 0, 'bytes': 0}
|
||||
_counter_dict = {'counter': _expr_counter}
|
||||
_expr_opt.append(_counter_dict)
|
||||
|
||||
_jump_opts = {'jump': {'target': self.chain_name} }
|
||||
|
||||
_expr_opt.append(_jump_opts)
|
||||
|
||||
_rule_params = {'family': _family,
|
||||
'table': 'filter',
|
||||
'chain': _chain,
|
||||
'expr': _expr_opt,
|
||||
'comment': "mailcow" }
|
||||
|
||||
_add_rule = {'insert': {'rule': _rule_params} }
|
||||
|
||||
_jump_rule["nftables"].append(_add_rule)
|
||||
|
||||
return _jump_rule
|
||||
|
||||
def insert_mailcow_chains(self, _family: str):
|
||||
nft_input_chain = self.nft_chain_names[_family]['filter']['input']
|
||||
nft_forward_chain = self.nft_chain_names[_family]['filter']['forward']
|
||||
# Command: 'nft list table <family> filter'
|
||||
_table_opts = {'family': _family, 'name': 'filter'}
|
||||
_list = {'list': {'table': _table_opts} }
|
||||
command = self.get_base_dict()
|
||||
command['nftables'].append(_list)
|
||||
kernel_ruleset = self.nft_exec_dict(command)
|
||||
if kernel_ruleset:
|
||||
# chain
|
||||
if not self.search_for_chain(kernel_ruleset, self.chain_name):
|
||||
cadena = self.get_chain_dict(_family, self.chain_name)
|
||||
if self.nft_exec_dict(cadena):
|
||||
self.logger.logInfo(f"MAILCOW {_family} chain created successfully.")
|
||||
|
||||
input_jump_found, forward_jump_found = False, False
|
||||
|
||||
for _object in kernel_ruleset["nftables"]:
|
||||
if not _object.get("rule"):
|
||||
continue
|
||||
|
||||
rule = _object["rule"]
|
||||
if nft_input_chain and rule["chain"] == nft_input_chain:
|
||||
if rule.get("comment") and rule["comment"] == "mailcow":
|
||||
input_jump_found = True
|
||||
if nft_forward_chain and rule["chain"] == nft_forward_chain:
|
||||
if rule.get("comment") and rule["comment"] == "mailcow":
|
||||
forward_jump_found = True
|
||||
|
||||
if not input_jump_found:
|
||||
command = self.get_mailcow_jump_rule_dict(_family, nft_input_chain)
|
||||
self.nft_exec_dict(command)
|
||||
|
||||
if not forward_jump_found:
|
||||
command = self.get_mailcow_jump_rule_dict(_family, nft_forward_chain)
|
||||
self.nft_exec_dict(command)
|
||||
|
||||
def delete_nat_rule(self, _family:str, _chain: str, _handle:str):
|
||||
delete_command = self.get_base_dict()
|
||||
_rule_opts = {'family': _family,
|
||||
'table': 'nat',
|
||||
'chain': _chain,
|
||||
'handle': _handle }
|
||||
_delete = {'delete': {'rule': _rule_opts} }
|
||||
delete_command["nftables"].append(_delete)
|
||||
|
||||
return self.nft_exec_dict(delete_command)
|
||||
|
||||
def snat_rule(self, _family: str, snat_target: str, source_address: str):
|
||||
chain_name = self.nft_chain_names[_family]['nat']['postrouting']
|
||||
|
||||
# no postrouting chain, may occur if docker has ipv6 disabled.
|
||||
if not chain_name: return
|
||||
|
||||
# Command: nft list chain <family> nat <chain_name>
|
||||
_chain_opts = {'family': _family, 'table': 'nat', 'name': chain_name}
|
||||
_list = {'list':{'chain': _chain_opts} }
|
||||
command = self.get_base_dict()
|
||||
command['nftables'].append(_list)
|
||||
kernel_ruleset = self.nft_exec_dict(command)
|
||||
if not kernel_ruleset:
|
||||
return
|
||||
|
||||
rule_position = 0
|
||||
rule_handle = None
|
||||
rule_found = False
|
||||
for _object in kernel_ruleset["nftables"]:
|
||||
if not _object.get("rule"):
|
||||
continue
|
||||
|
||||
rule = _object["rule"]
|
||||
if not rule.get("comment") or not rule["comment"] == "mailcow":
|
||||
rule_position +=1
|
||||
continue
|
||||
|
||||
rule_found = True
|
||||
rule_handle = rule["handle"]
|
||||
break
|
||||
|
||||
dest_net = ipaddress.ip_network(source_address)
|
||||
target_net = ipaddress.ip_network(snat_target)
|
||||
|
||||
if rule_found:
|
||||
saddr_ip = rule["expr"][0]["match"]["right"]["prefix"]["addr"]
|
||||
saddr_len = int(rule["expr"][0]["match"]["right"]["prefix"]["len"])
|
||||
|
||||
daddr_ip = rule["expr"][1]["match"]["right"]["prefix"]["addr"]
|
||||
daddr_len = int(rule["expr"][1]["match"]["right"]["prefix"]["len"])
|
||||
|
||||
target_ip = rule["expr"][3]["snat"]["addr"]
|
||||
|
||||
saddr_net = ipaddress.ip_network(saddr_ip + '/' + str(saddr_len))
|
||||
daddr_net = ipaddress.ip_network(daddr_ip + '/' + str(daddr_len))
|
||||
current_target_net = ipaddress.ip_network(target_ip)
|
||||
|
||||
match = all((
|
||||
dest_net == saddr_net,
|
||||
dest_net == daddr_net,
|
||||
target_net == current_target_net
|
||||
))
|
||||
try:
|
||||
if rule_position == 0:
|
||||
if not match:
|
||||
# Position 0 , it is a mailcow rule , but it does not have the same parameters
|
||||
if self.delete_nat_rule(_family, chain_name, rule_handle):
|
||||
self.logger.logInfo(f'Remove rule for source network {saddr_net} to SNAT target {target_net} from {_family} nat {chain_name} chain, rule does not match configured parameters')
|
||||
else:
|
||||
# Position > 0 and is mailcow rule
|
||||
if self.delete_nat_rule(_family, chain_name, rule_handle):
|
||||
self.logger.logInfo(f'Remove rule for source network {saddr_net} to SNAT target {target_net} from {_family} nat {chain_name} chain, rule is at position {rule_position}')
|
||||
except:
|
||||
self.logger.logCrit(f"Error running SNAT on {_family}, retrying..." )
|
||||
else:
|
||||
# rule not found
|
||||
json_command = self.get_base_dict()
|
||||
try:
|
||||
snat_dict = {'snat': {'addr': str(target_net.network_address)} }
|
||||
|
||||
expr_counter = {'family': _family, 'table': 'nat', 'packets': 0, 'bytes': 0}
|
||||
counter_dict = {'counter': expr_counter}
|
||||
|
||||
prefix_dict = {'prefix': {'addr': str(dest_net.network_address), 'len': int(dest_net.prefixlen)} }
|
||||
payload_dict = {'payload': {'protocol': _family, 'field': "saddr"} }
|
||||
match_dict1 = {'match': {'op': '==', 'left': payload_dict, 'right': prefix_dict} }
|
||||
|
||||
payload_dict2 = {'payload': {'protocol': _family, 'field': "daddr"} }
|
||||
match_dict2 = {'match': {'op': '!=', 'left': payload_dict2, 'right': prefix_dict } }
|
||||
expr_list = [
|
||||
match_dict1,
|
||||
match_dict2,
|
||||
counter_dict,
|
||||
snat_dict
|
||||
]
|
||||
rule_fields = {'family': _family,
|
||||
'table': 'nat',
|
||||
'chain': chain_name,
|
||||
'comment': "mailcow",
|
||||
'expr': expr_list }
|
||||
|
||||
insert_dict = {'insert': {'rule': rule_fields} }
|
||||
json_command["nftables"].append(insert_dict)
|
||||
if self.nft_exec_dict(json_command):
|
||||
self.logger.logInfo(f'Added {_family} nat {chain_name} rule for source network {dest_net} to {target_net}')
|
||||
except:
|
||||
self.logger.logCrit(f"Error running SNAT on {_family}, retrying...")
|
||||
|
||||
def get_chain_handle(self, _family: str, _table: str, chain_name: str):
|
||||
chain_handle = None
|
||||
# Command: 'nft list chains {family}'
|
||||
_list = {'list': {'chains': {'family': _family} } }
|
||||
command = self.get_base_dict()
|
||||
command['nftables'].append(_list)
|
||||
kernel_ruleset = self.nft_exec_dict(command)
|
||||
if kernel_ruleset:
|
||||
for _object in kernel_ruleset["nftables"]:
|
||||
if not _object.get("chain"):
|
||||
continue
|
||||
chain = _object["chain"]
|
||||
if chain["family"] == _family and chain["table"] == _table and chain["name"] == chain_name:
|
||||
chain_handle = chain["handle"]
|
||||
break
|
||||
return chain_handle
|
||||
|
||||
def get_rules_handle(self, _family: str, _table: str, chain_name: str):
|
||||
rule_handle = []
|
||||
# Command: 'nft list chain {family} {table} {chain_name}'
|
||||
_chain_opts = {'family': _family, 'table': _table, 'name': chain_name}
|
||||
_list = {'list': {'chain': _chain_opts} }
|
||||
command = self.get_base_dict()
|
||||
command['nftables'].append(_list)
|
||||
|
||||
kernel_ruleset = self.nft_exec_dict(command)
|
||||
if kernel_ruleset:
|
||||
for _object in kernel_ruleset["nftables"]:
|
||||
if not _object.get("rule"):
|
||||
continue
|
||||
|
||||
rule = _object["rule"]
|
||||
if rule["family"] == _family and rule["table"] == _table and rule["chain"] == chain_name:
|
||||
if rule.get("comment") and rule["comment"] == "mailcow":
|
||||
rule_handle.append(rule["handle"])
|
||||
return rule_handle
|
||||
|
||||
def get_ban_ip_dict(self, ipaddr: str, _family: str):
|
||||
json_command = self.get_base_dict()
|
||||
|
||||
expr_opt = []
|
||||
ipaddr_net = ipaddress.ip_network(ipaddr)
|
||||
right_dict = {'prefix': {'addr': str(ipaddr_net.network_address), 'len': int(ipaddr_net.prefixlen) } }
|
||||
|
||||
left_dict = {'payload': {'protocol': _family, 'field': 'saddr'} }
|
||||
match_dict = {'op': '==', 'left': left_dict, 'right': right_dict }
|
||||
expr_opt.append({'match': match_dict})
|
||||
|
||||
counter_dict = {'counter': {'family': _family, 'table': "filter", 'packets': 0, 'bytes': 0} }
|
||||
expr_opt.append(counter_dict)
|
||||
|
||||
expr_opt.append({'drop': "null"})
|
||||
|
||||
rule_dict = {'family': _family, 'table': "filter", 'chain': self.chain_name, 'expr': expr_opt}
|
||||
|
||||
base_dict = {'insert': {'rule': rule_dict} }
|
||||
json_command["nftables"].append(base_dict)
|
||||
|
||||
return json_command
|
||||
|
||||
def get_unban_ip_dict(self, ipaddr:str, _family: str):
|
||||
json_command = self.get_base_dict()
|
||||
# Command: 'nft list chain {s_family} filter MAILCOW'
|
||||
_chain_opts = {'family': _family, 'table': 'filter', 'name': self.chain_name}
|
||||
_list = {'list': {'chain': _chain_opts} }
|
||||
command = self.get_base_dict()
|
||||
command['nftables'].append(_list)
|
||||
kernel_ruleset = self.nft_exec_dict(command)
|
||||
rule_handle = None
|
||||
if kernel_ruleset:
|
||||
for _object in kernel_ruleset["nftables"]:
|
||||
if not _object.get("rule"):
|
||||
continue
|
||||
|
||||
rule = _object["rule"]["expr"][0]["match"]
|
||||
left_opt = rule["left"]["payload"]
|
||||
if not left_opt["protocol"] == _family:
|
||||
continue
|
||||
if not left_opt["field"] =="saddr":
|
||||
continue
|
||||
|
||||
# ip currently banned
|
||||
rule_right = rule["right"]
|
||||
if isinstance(rule_right, dict):
|
||||
current_rule_ip = rule_right["prefix"]["addr"] + '/' + str(rule_right["prefix"]["len"])
|
||||
else:
|
||||
current_rule_ip = rule_right
|
||||
current_rule_net = ipaddress.ip_network(current_rule_ip)
|
||||
|
||||
# ip to ban
|
||||
candidate_net = ipaddress.ip_network(ipaddr)
|
||||
|
||||
if current_rule_net == candidate_net:
|
||||
rule_handle = _object["rule"]["handle"]
|
||||
break
|
||||
|
||||
if rule_handle is not None:
|
||||
mailcow_rule = {'family': _family, 'table': 'filter', 'chain': self.chain_name, 'handle': rule_handle}
|
||||
delete_rule = {'delete': {'rule': mailcow_rule} }
|
||||
json_command["nftables"].append(delete_rule)
|
||||
else:
|
||||
return False
|
||||
|
||||
return json_command
|
||||
|
||||
def check_mailcow_chains(self, family: str, chain: str):
|
||||
position = 0
|
||||
rule_found = False
|
||||
chain_name = self.nft_chain_names[family]['filter'][chain]
|
||||
|
||||
if not chain_name: return None
|
||||
|
||||
_chain_opts = {'family': family, 'table': 'filter', 'name': chain_name}
|
||||
_list = {'list': {'chain': _chain_opts}}
|
||||
command = self.get_base_dict()
|
||||
command['nftables'].append(_list)
|
||||
kernel_ruleset = self.nft_exec_dict(command)
|
||||
if kernel_ruleset:
|
||||
for _object in kernel_ruleset["nftables"]:
|
||||
if not _object.get("rule"):
|
||||
continue
|
||||
rule = _object["rule"]
|
||||
if rule.get("comment") and rule["comment"] == "mailcow":
|
||||
rule_found = True
|
||||
break
|
||||
|
||||
position+=1
|
||||
|
||||
return position if rule_found else False
|
||||
0
data/Dockerfiles/netfilter/modules/__init__.py
Normal file
0
data/Dockerfiles/netfilter/modules/__init__.py
Normal file
@ -434,7 +434,7 @@ services:
|
||||
- acme
|
||||
|
||||
netfilter-mailcow:
|
||||
image: mailcow/netfilter:1.52
|
||||
image: mailcow/netfilter:1.53
|
||||
stop_grace_period: 30s
|
||||
depends_on:
|
||||
- dovecot-mailcow
|
||||
|
||||
Loading…
Reference in New Issue
Block a user