pinecrypt/pinecrypt-gateway-firewall
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Add MSS clamping option

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This commit is contained in:
Lauri Võsandi 2021-06-25 18:20:06 +00:00
parent b0aafc5fda
commit bbcaaa58b6
1 changed files with 7 additions and 0 deletions
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7
firewall.py
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@ -11,6 +11,7 @@ FQDN = socket.getfqdn()
DEBUG = os.getenv("DEBUG")
DISABLE_MASQUERADE = os.getenv("DISABLE_MASQUERADE")
MONGO_URI = os.getenv("MONGO_URI")
TCP_MSS_CLAMPING = int(os.getenv("TCP_MSS_CLAMPING", "1452"))
mongo_uri = pymongo.uri_parser.parse_uri(MONGO_URI)
ALLOW_MONGO_REPLICA_TRAFFIC = False
@ -71,6 +72,12 @@ def generate_firewall_rules(disabled=False):
yield "-A OUTPUT -j ACCEPT"
yield "COMMIT"
yield "*mangle"
yield "-A FORWARD -p tcp -m tcp --tcp-flags SYN,RST SYN " \
"-m tcpmss --mss %d:1536 -j TCPMSS --set-mss %d " \
"-m comment --comment \"MSS clamping\"" % (TCP_MSS_CLAMPING+1, TCP_MSS_CLAMPING)
yield "COMMIT"
yield "*nat"
yield ":PREROUTING ACCEPT [0:0]"
if disabled: