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Removed transient firewall rule for SSDP client port

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No longer requires opening a fixed port and then closing it again.
Uses nftables sets to recognise the client port.
This commit is contained in:
David Buscher 2021-07-10 16:58:24 +01:00
parent 98ad28e290
commit 667dba421a
1 changed files with 14 additions and 14 deletions
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28
src/yunohost/firewall.py
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@ -258,7 +258,13 @@ def firewall_reload(skip_upnp=False):
"iptables -w -A INPUT -p icmp -j ACCEPT",
"iptables -w -P INPUT DROP",
]
# Set of nft rules for allowing SSDP discovery
# See https://github.com/mqus/nft-rules/blob/master/files/SSDP_client.md
rules += [
"nft add set filter ssdp_out {type inet_service \\; timeout 5s \\;}",
"nft add rule filter OUTPUT ip daddr 239.255.255.250 udp dport 1900 set add udp sport @ssdp_out",
"nft add rule filter INPUT udp dport @ssdp_out accept",
]
# Execute each rule
if process.run_commands(rules, callback=_on_rule_command_error):
errors = True
@ -291,7 +297,11 @@ def firewall_reload(skip_upnp=False):
"ip6tables -w -A INPUT -p icmpv6 -j ACCEPT",
"ip6tables -w -P INPUT DROP",
]
rules += [
"nft add set ip6 filter ssdp_out {type inet_service \\; timeout 5s \\;}",
"nft add rule ip6 filter OUTPUT ip6 daddr {FF02::C, FF05::C, FF08::C, FF0E::C} udp dport 1900 set add udp sport @ssdp_out",
"nft add rule ip6 filter INPUT udp dport @ssdp_out accept",
]
# Execute each rule
if process.run_commands(rules, callback=_on_rule_command_error):
errors = True
@ -338,7 +348,7 @@ def firewall_upnp(action="status", no_refresh=False):
# Add cron job
with open(UPNP_CRON_JOB, "w+") as f:
f.write(
"*/10 * * * * root "
"*/12 * * * * root "
"/usr/bin/yunohost firewall upnp status >>/dev/null\n"
)
enabled = True
@ -355,22 +365,12 @@ def firewall_upnp(action="status", no_refresh=False):
# Refresh port mapping
refresh_success = True
if not no_refresh:
# Open port to receive discovery message
process.run_commands(
["iptables -w -A INPUT -p udp --dport %d -j ACCEPT" % SSDP_CLIENT_PORT],
callback=_on_rule_command_error,
)
upnpc = miniupnpc.UPnP(localport=SSDP_CLIENT_PORT)
upnpc = miniupnpc.UPnP()
upnpc.discoverdelay = 3000
# Discover UPnP device(s)
logger.debug("discovering UPnP devices...")
nb_dev = upnpc.discover()
logger.debug("found %d UPnP device(s)", int(nb_dev))
# Close discovery port
process.run_commands(
["iptables -w -D INPUT -p udp --dport %d -j ACCEPT" % SSDP_CLIENT_PORT],
callback=_on_rule_command_error,
)
if nb_dev < 1:
logger.error(m18n.n("upnp_dev_not_found"))