mirror of
https://github.com/bol-van/zapret.git
synced 2024-12-24 23:26:42 +00:00
543 lines
14 KiB
Bash
543 lines
14 KiB
Bash
[ -n "$ZAPRET_NFT_TABLE" ] || ZAPRET_NFT_TABLE=zapret
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# required for : nft -f -
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create_dev_stdin
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nft_create_table()
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{
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nft add table inet $ZAPRET_NFT_TABLE
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}
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nft_del_table()
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{
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nft delete table inet $ZAPRET_NFT_TABLE 2>/dev/null
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}
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nft_list_table()
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{
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nft -t list table inet $ZAPRET_NFT_TABLE
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}
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nft_create_set()
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{
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# $1 - set name
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# $2 - params
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nft create set inet $ZAPRET_NFT_TABLE $1 "{ $2 }" 2>/dev/null
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}
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nft_del_set()
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{
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# $1 - set name
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nft delete set inet $ZAPRET_NFT_TABLE $1
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}
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nft_flush_set()
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{
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# $1 - set name
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nft flush set inet $ZAPRET_NFT_TABLE $1
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}
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nft_set_exists()
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{
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# $1 - set name
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nft -t list set inet $ZAPRET_NFT_TABLE $1 2>/dev/null >/dev/null
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}
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nft_del_all_chains_from_table()
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{
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# $1 - table_name with or without family
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# delete all chains with possible references to each other
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# cannot just delete all in the list because of references
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# avoid infinite loops
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local chains deleted=1 error=1
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while [ -n "$deleted" -a -n "$error" ]; do
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chains=$(nft -t list table $1 2>/dev/null | sed -nre "s/^[ ]*chain ([^ ]+) \{/\1/p" | xargs)
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[ -n "$chains" ] || break
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deleted=
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error=
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for chain in $chains; do
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if nft delete chain $1 $chain 2>/dev/null; then
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deleted=1
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else
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error=1
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fi
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done
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done
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}
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nft_create_chains()
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{
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cat << EOF | nft -f -
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add chain inet $ZAPRET_NFT_TABLE dnat_output { type nat hook output priority -101; }
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flush chain inet $ZAPRET_NFT_TABLE dnat_output
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add chain inet $ZAPRET_NFT_TABLE dnat_pre { type nat hook prerouting priority -101; }
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flush chain inet $ZAPRET_NFT_TABLE dnat_pre
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add chain inet $ZAPRET_NFT_TABLE forward { type filter hook forward priority -1; }
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flush chain inet $ZAPRET_NFT_TABLE forward
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add chain inet $ZAPRET_NFT_TABLE input { type filter hook input priority -1; }
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flush chain inet $ZAPRET_NFT_TABLE input
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add chain inet $ZAPRET_NFT_TABLE flow_offload
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flush chain inet $ZAPRET_NFT_TABLE flow_offload
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add chain inet $ZAPRET_NFT_TABLE localnet_protect
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flush chain inet $ZAPRET_NFT_TABLE localnet_protect
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add rule inet $ZAPRET_NFT_TABLE localnet_protect ip daddr $TPWS_LOCALHOST4 return comment "route_localnet allow access to tpws"
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add rule inet $ZAPRET_NFT_TABLE localnet_protect ip daddr 127.0.0.0/8 drop comment "route_localnet remote access protection"
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add rule inet $ZAPRET_NFT_TABLE input iif != lo jump localnet_protect
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add chain inet $ZAPRET_NFT_TABLE postrouting { type filter hook postrouting priority -151; }
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flush chain inet $ZAPRET_NFT_TABLE postrouting
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add set inet $ZAPRET_NFT_TABLE lanif { type ifname; }
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add set inet $ZAPRET_NFT_TABLE wanif { type ifname; }
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add set inet $ZAPRET_NFT_TABLE wanif6 { type ifname; }
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add map inet $ZAPRET_NFT_TABLE link_local { type ifname : ipv6_addr; }
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EOF
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}
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nft_del_chains()
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{
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# do not delete all chains because of additional user hooks
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# they must be inside zapret table to use nfsets
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cat << EOF | nft -f - 2>/dev/null
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delete chain inet $ZAPRET_NFT_TABLE dnat_output
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delete chain inet $ZAPRET_NFT_TABLE dnat_pre
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delete chain inet $ZAPRET_NFT_TABLE forward
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delete chain inet $ZAPRET_NFT_TABLE input
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delete chain inet $ZAPRET_NFT_TABLE postrouting
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delete chain inet $ZAPRET_NFT_TABLE flow_offload
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delete chain inet $ZAPRET_NFT_TABLE localnet_protect
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EOF
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}
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nft_del_flowtable()
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{
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nft delete flowtable inet $ZAPRET_NFT_TABLE ft 2>/dev/null
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}
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nft_create_or_update_flowtable()
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{
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# $1 = flags ('offload' for hw offload)
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# $2,$3,$4,... - interfaces
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# can be called multiple times to add interfaces. interfaces can only be added , not removed
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local flags=$1 devices makelist
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shift
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# warning ! nft versions at least up to 1.0.1 do not allow interface names starting with digit in flowtable and do not allow quoting
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# warning ! openwrt fixes this in post-21.x snapshots with special nft patch
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# warning ! in traditional linux distros nft is unpatched and will fail with quoted interface definitions if unfixed
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[ -n "$flags" ] && flags="flags $flags;"
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for makelist in make_quoted_comma_list make_comma_list; do
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$makelist devices "$@"
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[ -n "$devices" ] && devices="devices={$devices};"
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nft add flowtable inet $ZAPRET_NFT_TABLE ft "{ hook ingress priority -1; $flags $devices }" && break
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done
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}
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nft_flush_ifsets()
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{
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cat << EOF | nft -f - 2>/dev/null
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flush set inet $ZAPRET_NFT_TABLE lanif
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flush set inet $ZAPRET_NFT_TABLE wanif
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flush set inet $ZAPRET_NFT_TABLE wanif6
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flush map inet $ZAPRET_NFT_TABLE link_local
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EOF
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}
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nft_flush_link_local()
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{
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nft flush map inet $ZAPRET_NFT_TABLE link_local 2>/dev/null
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}
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nft_list_ifsets()
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{
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nft list set inet $ZAPRET_NFT_TABLE lanif
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nft list set inet $ZAPRET_NFT_TABLE wanif
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nft list set inet $ZAPRET_NFT_TABLE wanif6
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nft list map inet $ZAPRET_NFT_TABLE link_local
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nft list flowtable inet $ZAPRET_NFT_TABLE ft 2>/dev/null
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}
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nft_create_firewall()
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{
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nft_create_table
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nft_del_flowtable
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nft_flush_link_local
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nft_create_chains
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}
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nft_del_firewall()
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{
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nft_del_chains
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nft_del_flowtable
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nft_flush_link_local
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# leave ifsets and ipsets because they may be used by custom rules
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}
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nft_add_rule()
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{
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# $1 - chain
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# $2,$3,... - rule(s)
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local chain="$1"
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shift
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nft add rule inet $ZAPRET_NFT_TABLE $chain "$@"
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}
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nft_add_set_element()
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{
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# $1 - set or map name
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# $2 - element
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[ -z "$2" ] || nft add element inet $ZAPRET_NFT_TABLE $1 "{ $2 }"
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}
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nft_add_set_elements()
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{
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# $1 - set or map name
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# $2,$3,... - element(s)
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local set="$1" elements
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shift
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make_comma_list elements "$@"
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nft_add_set_element $set "$elements"
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}
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nft_reverse_nfqws_rule()
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{
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echo "$@" | sed -e 's/oifname /iifname /g' -e 's/dport /sport /g' -e 's/daddr /saddr /g' -e 's/ct original /ct reply /g' -e "s/mark and $DESYNC_MARK == 0//g"
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}
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nft_clean_nfqws_rule()
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{
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echo "$@" | sed -e "s/mark and $DESYNC_MARK == 0//g"
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}
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nft_add_nfqws_flow_exempt_rule()
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{
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# $1 - rule (must be all filters in one var)
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nft_add_rule flow_offload $(nft_clean_nfqws_rule $1) return comment \"direct flow offloading exemption\"
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# do not need this because of oifname @wanif/@wanif6 filter in forward chain
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#nft_add_rule flow_offload $(nft_reverse_nfqws_rule $1) return comment \"reverse flow offloading exemption\"
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}
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nft_hw_offload_supported()
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{
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# $1,$2,... - interface names
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local devices res=1
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make_quoted_comma_list devices "$@"
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[ -n "$devices" ] && devices="devices={$devices};"
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nft add table ${ZAPRET_NFT_TABLE}_test && nft add flowtable ${ZAPRET_NFT_TABLE}_test ft "{ flags offload; $devices }" 2>/dev/null && res=0
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nft delete table ${ZAPRET_NFT_TABLE}_test 2>/dev/null
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return $res
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}
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nft_apply_flow_offloading()
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{
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# ft can be absent
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nft_add_rule flow_offload meta l4proto "{ tcp, udp }" flow add @ft 2>/dev/null && {
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# allow only outgoing packets to initiate flow offload
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nft_add_rule forward oifname @wanif jump flow_offload
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nft_add_rule forward oifname @wanif6 jump flow_offload
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}
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}
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nft_filter_apply_port_target()
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{
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# $1 - var name of nftables filter
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local f
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if [ "$MODE_HTTP" = "1" ] && [ "$MODE_HTTPS" = "1" ]; then
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f="tcp dport {80,443}"
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elif [ "$MODE_HTTPS" = "1" ]; then
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f="tcp dport 443"
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elif [ "$MODE_HTTP" = "1" ]; then
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f="tcp dport 80"
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else
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echo WARNING !!! HTTP and HTTPS are both disabled
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fi
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eval $1="\"\$$1 $f\""
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}
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nft_filter_apply_ipset_target4()
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{
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# $1 - var name of ipv4 nftables filter
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if [ "$MODE_FILTER" = "ipset" ]; then
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eval $1="\"\$$1 ip daddr @zapret\""
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fi
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}
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nft_filter_apply_ipset_target6()
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{
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# $1 - var name of ipv6 nftables filter
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if [ "$MODE_FILTER" = "ipset" ]; then
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eval $1="\"\$$1 ip6 daddr @zapret6\""
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fi
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}
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nft_filter_apply_ipset_target()
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{
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# $1 - var name of ipv4 nftables filter
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# $2 - var name of ipv6 nftables filter
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nft_filter_apply_ipset_target4 $1
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nft_filter_apply_ipset_target6 $2
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}
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nft_script_add_ifset_element()
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{
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# $1 - set name
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# $2 - space separated elements
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local elements
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[ -n "$2" ] && {
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make_quoted_comma_list elements $2
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script="${script}
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add element inet $ZAPRET_NFT_TABLE $1 { $elements }"
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}
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}
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nft_fill_ifsets()
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{
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# $1 - space separated lan interface names
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# $2 - space separated wan interface names
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# $3 - space separated wan6 interface names
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local script i j ALLDEVS devs
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# if large sets exist nft works very ineffectively
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# looks like it analyzes the whole table blob to find required data pieces
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# calling all in one shot helps not to waste cpu time many times
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script="flush set inet $ZAPRET_NFT_TABLE wanif
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flush set inet $ZAPRET_NFT_TABLE wanif6
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flush set inet $ZAPRET_NFT_TABLE lanif"
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[ "$DISABLE_IPV4" = "1" ] || nft_script_add_ifset_element wanif "$2"
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[ "$DISABLE_IPV6" = "1" ] || nft_script_add_ifset_element wanif6 "$3"
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nft_script_add_ifset_element lanif "$1"
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echo "$script" | nft -f -
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case "$FLOWOFFLOAD" in
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software)
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ALLDEVS=$(unique $1 $2 $3)
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# unbound flowtable may cause error in older nft version
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nft_create_or_update_flowtable '' $ALLDEVS 2>/dev/null
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;;
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hardware)
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ALLDEVS=$(unique $1 $2 $3)
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# first create unbound flowtable. may cause error in older nft version
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nft_create_or_update_flowtable 'offload' 2>/dev/null
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# then add elements. some of them can cause error because unsupported
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for i in $ALLDEVS; do
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if nft_hw_offload_supported $i; then
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nft_create_or_update_flowtable 'offload' $i
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else
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# bridge members must be added instead of the bridge itself
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devs=$(resolve_lower_devices $i)
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[ -n "$devs" ] && nft_hw_offload_supported $devs && {
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for j in $devs; do
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nft_create_or_update_flowtable 'offload' $j
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done
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}
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fi
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done
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;;
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esac
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}
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nft_only()
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{
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linux_fwtype
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case "$FWTYPE" in
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nftables)
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"$@"
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;;
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esac
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}
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nft_print_op()
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{
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echo "Adding nftables ipv$3 rule for $2 : $1"
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}
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_nft_fw_tpws4()
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{
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# $1 - filter ipv4
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# $2 - tpws port
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# $3 - not-empty if wan interface filtering required
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[ "$DISABLE_IPV4" = "1" ] || {
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local filter="$1" port="$2"
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nft_print_op "$filter" "tpws (port $2)" 4
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nft_add_rule dnat_output skuid != $WS_USER ${3:+oifname @wanif }$filter ip daddr != @nozapret dnat ip to $TPWS_LOCALHOST4:$port
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nft_add_rule dnat_pre iifname @lanif $filter ip daddr != @nozapret dnat ip to $TPWS_LOCALHOST4:$port
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prepare_route_localnet
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}
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}
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_nft_fw_tpws6()
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{
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# $1 - filter ipv6
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# $2 - tpws port
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# $3 - lan interface names space separated
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# $4 - not-empty if wan interface filtering required
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[ "$DISABLE_IPV6" = "1" ] || {
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local filter="$1" port="$2" DNAT6 i
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nft_print_op "$filter" "tpws (port $port)" 6
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nft_add_rule dnat_output skuid != $WS_USER ${4:+oifname @wanif6 }$filter ip6 daddr != @nozapret6 dnat ip6 to [::1]:$port
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[ -n "$3" ] && {
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nft_add_rule dnat_pre $filter ip6 daddr != @nozapret6 dnat ip6 to iifname map @link_local:$port
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for i in $3; do
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_dnat6_target $i DNAT6
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# can be multiple tpws processes on different ports
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[ -n "$DNAT6" -a "$DNAT6" != '-' ] && nft_add_set_element link_local "$i : $DNAT6"
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done
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}
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}
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}
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nft_fw_tpws()
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{
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# $1 - filter ipv4
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# $2 - filter ipv6
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# $3 - tpws port
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nft_fw_tpws4 "$1" $3
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nft_fw_tpws6 "$2" $3
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}
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_nft_fw_nfqws_post4()
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{
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# $1 - filter ipv4
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# $2 - queue number
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# $3 - not-empty if wan interface filtering required
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[ "$DISABLE_IPV4" = "1" ] || {
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local filter="$1" port="$2" rule
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nft_print_op "$filter" "nfqws postrouting (qnum $port)" 4
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rule="${3:+oifname @wanif }$filter ip daddr != @nozapret"
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nft_add_rule postrouting $rule queue num $port bypass
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nft_add_nfqws_flow_exempt_rule "$rule"
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}
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}
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_nft_fw_nfqws_post6()
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{
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# $1 - filter ipv6
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# $2 - queue number
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# $3 - not-empty if wan interface filtering required
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[ "$DISABLE_IPV6" = "1" ] || {
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local filter="$1" port="$2" rule
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nft_print_op "$filter" "nfqws postrouting (qnum $port)" 6
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rule="${3:+oifname @wanif6 }$filter ip6 daddr != @nozapret6"
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nft_add_rule postrouting $rule queue num $port bypass
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nft_add_nfqws_flow_exempt_rule "$rule"
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}
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}
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nft_fw_nfqws_post()
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{
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# $1 - filter ipv4
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# $2 - filter ipv6
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# $3 - queue number
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nft_fw_nfqws_post4 "$1" $3
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nft_fw_nfqws_post6 "$2" $3
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}
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zapret_reload_ifsets()
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{
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nft_only nft_create_table ; nft_fill_ifsets_overload
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return 0
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}
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zapret_list_ifsets()
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{
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nft_only nft_list_ifsets
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return 0
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}
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zapret_list_table()
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{
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nft_only nft_list_table
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return 0
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}
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zapret_apply_firewall_rules_nft()
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{
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local mode="${MODE_OVERRIDE:-$MODE}"
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local first_packet_only="ct original packets 1-4"
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local desync="mark and $DESYNC_MARK == 0"
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local f4 f6 qn qns qn6 qns6
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case "$mode" in
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tpws)
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if [ ! "$MODE_HTTP" = "1" ] && [ ! "$MODE_HTTPS" = "1" ]; then
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echo both http and https are disabled. not applying redirection.
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else
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nft_filter_apply_port_target f4
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f6=$f4
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nft_filter_apply_ipset_target f4 f6
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nft_fw_tpws "$f4" "$f6" $TPPORT
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fi
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;;
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nfqws)
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# quite complex but we need to minimize nfqws processes to save RAM
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get_nfqws_qnums qn qns qn6 qns6
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if [ "$MODE_HTTP_KEEPALIVE" != "1" ] && [ -n "$qn" ] && [ "$qn" = "$qns" ]; then
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nft_filter_apply_port_target f4
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f4="$f4 $first_packet_only"
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nft_filter_apply_ipset_target4 f4
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nft_fw_nfqws_post4 "$f4 $desync" $qn
|
|
else
|
|
if [ -n "$qn" ]; then
|
|
f4="tcp dport 80"
|
|
[ "$MODE_HTTP_KEEPALIVE" = "1" ] || f4="$f4 $first_packet_only"
|
|
nft_filter_apply_ipset_target4 f4
|
|
nft_fw_nfqws_post4 "$f4 $desync" $qn
|
|
fi
|
|
if [ -n "$qns" ]; then
|
|
f4="tcp dport 443 $first_packet_only"
|
|
nft_filter_apply_ipset_target4 f4
|
|
nft_fw_nfqws_post4 "$f4 $desync" $qns
|
|
fi
|
|
fi
|
|
if [ "$MODE_HTTP_KEEPALIVE" != "1" ] && [ -n "$qn6" ] && [ "$qn6" = "$qns6" ]; then
|
|
nft_filter_apply_port_target f6
|
|
f6="$f6 $first_packet_only"
|
|
nft_filter_apply_ipset_target6 f6
|
|
nft_fw_nfqws_post6 "$f6 $desync" $qn6
|
|
else
|
|
if [ -n "$qn6" ]; then
|
|
f6="tcp dport 80"
|
|
[ "$MODE_HTTP_KEEPALIVE" = "1" ] || f6="$f6 $first_packet_only"
|
|
nft_filter_apply_ipset_target6 f6
|
|
nft_fw_nfqws_post6 "$f6 $desync" $qn6
|
|
fi
|
|
if [ -n "$qns6" ]; then
|
|
f6="tcp dport 443 $first_packet_only"
|
|
nft_filter_apply_ipset_target6 f6
|
|
nft_fw_nfqws_post6 "$f6 $desync" $qns6
|
|
fi
|
|
fi
|
|
;;
|
|
custom)
|
|
existf zapret_custom_firewall_nft && zapret_custom_firewall_nft
|
|
;;
|
|
esac
|
|
}
|
|
|
|
zapret_apply_firewall_nft()
|
|
{
|
|
echo Applying nftables
|
|
|
|
local mode="${MODE_OVERRIDE:-$MODE}"
|
|
|
|
[ "$mode" = "tpws-socks" ] && return 0
|
|
|
|
create_ipset no-update
|
|
nft_create_firewall
|
|
nft_fill_ifsets_overload
|
|
|
|
zapret_apply_firewall_rules_nft
|
|
|
|
[ "$FLOWOFFLOAD" = 'software' -o "$FLOWOFFLOAD" = 'hardware' ] && nft_apply_flow_offloading
|
|
|
|
return 0
|
|
}
|
|
zapret_unapply_firewall_nft()
|
|
{
|
|
echo Clearing nftables
|
|
|
|
unprepare_route_localnet
|
|
nft_del_firewall
|
|
return 0
|
|
}
|
|
zapret_do_firewall_nft()
|
|
{
|
|
# $1 - 1 - add, 0 - del
|
|
|
|
if [ "$1" = 0 ] ; then
|
|
zapret_unapply_firewall_nft
|
|
else
|
|
zapret_apply_firewall_nft
|
|
fi
|
|
|
|
return 0
|
|
}
|