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Revert "Removed transient firewall rule for SSDP client port"

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This reverts commit 667dba421a.
This commit is contained in:
David Buscher 2021-12-11 09:21:06 +00:00
parent c486bb032f
commit 665898ffa8
1 changed files with 23 additions and 18 deletions
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41
src/yunohost/firewall.py
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@ -35,6 +35,11 @@ from moulinette.utils.text import prependlines
FIREWALL_FILE = "/etc/yunohost/firewall.yml"
UPNP_CRON_JOB = "/etc/cron.d/yunohost-firewall-upnp"
# A UDP port to use for the SSDP discovery phase of UPNP.
# Assigned by IANA to "Fujitsu ICL Terminal Emulator Program A", so no-one else is
# likely to use it (unlike port 1900 which is used by SSDP servers such
# as miniupnpd)
SSDP_CLIENT_PORT = 1901
logger = getActionLogger("yunohost.firewall")
@ -228,10 +233,10 @@ def firewall_reload(skip_upnp=False):
# IPv4
try:
process.check_output("nft -n -a list ruleset")
process.check_output("iptables -w -L")
except process.CalledProcessError as e:
logger.debug(
"nftables/nft seems to be not available, it outputs:\n%s",
"iptables seems to be not available, it outputs:\n%s",
prependlines(e.output.rstrip(), "> "),
)
logger.warning(m18n.n("iptables_unavailable"))
@ -253,13 +258,7 @@ 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
@ -267,10 +266,10 @@ def firewall_reload(skip_upnp=False):
# IPv6
try:
process.check_output("nft -n -a list ruleset")
process.check_output("ip6tables -L")
except process.CalledProcessError as e:
logger.debug(
"ip6tables/nft seems to be not available, it outputs:\n%s",
"ip6tables seems to be not available, it outputs:\n%s",
prependlines(e.output.rstrip(), "> "),
)
logger.warning(m18n.n("ip6tables_unavailable"))
@ -292,11 +291,7 @@ 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
@ -343,7 +338,7 @@ def firewall_upnp(action="status", no_refresh=False):
# Add cron job
with open(UPNP_CRON_JOB, "w+") as f:
f.write(
"*/12 * * * * root "
"*/10 * * * * root "
"/usr/bin/yunohost firewall upnp status >>/dev/null\n"
)
enabled = True
@ -360,12 +355,22 @@ def firewall_upnp(action="status", no_refresh=False):
# Refresh port mapping
refresh_success = True
if not no_refresh:
upnpc = miniupnpc.UPnP()
# 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.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"))