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Add support for encrypted connections 'FTP out only'.

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This commit is contained in:
Christoph 2019-03-02 21:48:13 +01:00
parent 39529f7f54
commit 3c896d7052
2 changed files with 65 additions and 21 deletions
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60
ip6t-firewall-server
View File

@ -1290,14 +1290,36 @@ echononl "\t\tFTP out only (using CT target)"
# -
$ip6t -A OUTPUT -t raw -p tcp --dport 21 -j CT --helper ftp
# - Used for different ftpdata recent lists 'ftp6data_out_$j'
# -
declare -i j=1
for _dev in ${ext_if_arr[@]} ; do
# - Open FTP connection
$ip6t -A OUTPUT -o $_dev -p tcp --dport 21 -m state --state NEW -j ACCEPT
#
# - (1)
# -
# - Open FTP connection and add the destination ip (--rdest) to ftpdata recent list 'ftpdata_out_$j'.
# -
$ip6t -A OUTPUT -o $_dev -p tcp --dport 21 -m state --state NEW \
-m recent --name ftp6data_out_$j --rdest --set -j ACCEPT
# - (2)
# - - Accept packets if the destination ip-address (--rdest) is in the 'ftpdata_$i' list (--update)
# - and the destination ip-address was seen within the last 1800 seconds (--seconds 1800).
# -
# - - If matched, the "last seen" timestamp of the destination address will be updated (--update).
# -
# - - Entries in the ftpdata list not seen in the last 1800 will be removed (--reap).
# -
$ip6t -A OUTPUT -o $_dev -p tcp -m state --state NEW --dport 1024: \
-m recent --name ftp6data_out_$j --rdest --update --seconds 1800 --reap -j ACCEPT
((j++))
# - Accept (helper ftp) related connections
# -
$ip6t -A OUTPUT -m conntrack --ctstate RELATED -m helper --helper ftp -o $_dev -p tcp --dport 1024: -j ACCEPT
done
echo_done
@ -1333,7 +1355,7 @@ echononl "\t\tFTP Server (using CT target)"
if [[ ${#ftp_server_ip_arr[@]} -gt 0 ]] || [[ ${#forward_ftp_server_ip_arr[@]} -gt 0 ]] ; then
# - Used for different ftp6data recent lists 'ftp6data_$i'
# - Used for different ftpdata recent lists 'ftpdata_$i'
# -
declare -i i=1
@ -1355,27 +1377,27 @@ if [[ ${#ftp_server_ip_arr[@]} -gt 0 ]] || [[ ${#forward_ftp_server_ip_arr[@]} -
# - ======================================================
# -
# - Workaround:
# - (1) add source ip to a 'recent list' named 'ftp6data_$i! if ftp control connections appear
# - (2) accept packets of the formaly created recent list 'ftp6data_$i!
# - (1) add source ip to a 'recent list' named 'ftpdata_$i! if ftp control connections appear
# - (2) accept packets of the formaly created recent list 'ftpdata_$i!
# -
# =====
# - (1)
# -
# - Accept initial FTP connection and add the source ip to ftpdata recent list 'ftp6data_$i'.
# - Accept initial FTP connection and add the source ip to ftpdata recent list 'ftpdata_$i'.
# -
$ip6t -A INPUT -p tcp -m state --state NEW -d $_ip --dport 21 -m recent --name ftp6data_$i --set -j ACCEPT
$ip6t -A INPUT -p tcp -m state --state NEW -d $_ip --dport 21 -m recent --name ftpdata_$i --set -j ACCEPT
# - (2)
# - - Accept packets if the source ip-address is in the 'ftp6data_$i' list (--update) and the
# - - Accept packets if the source ip-address is in the 'ftpdata_$i' list (--update) and the
# - source ip-address was seen within the last 1800 seconds (--seconds 1800).
# -
# - - If matched, the "last seen" timestamp of the source address will be updated (--update).
# -
# - - Entries in the ftp6data list not seen in the last 1800 will be removed (--reap).
# - - Entries in the ftpdata list not seen in the last 1800 will be removed (--reap).
# -
$ip6t -A INPUT -p tcp -m state --state NEW --sport 1024: -d $_ip --dport $ftp_passive_port_range \
-m recent --name ftp6data_$i --update --seconds 1800 --reap -j ACCEPT
-m recent --name ftpdata_$i --update --seconds 1800 --reap -j ACCEPT
# - Accept (helper ftp) related connections
# -
@ -1396,29 +1418,29 @@ if [[ ${#ftp_server_ip_arr[@]} -gt 0 ]] || [[ ${#forward_ftp_server_ip_arr[@]} -
# - ======================================================
# -
# - Workaround:
# - (1) add source ip to a 'recent list' named 'ftp6data_$i! if ftp control connections appear
# - (2) accept packets of the formaly created recent list 'ftp6data_$i!
# - (1) add source ip to a 'recent list' named 'ftpdata_$i! if ftp control connections appear
# - (2) accept packets of the formaly created recent list 'ftpdata_$i!
# -
# =====
# - (1)
# -
# - Accept initial FTP connection and add the source ip to ftpdata recent list 'ftp6data_$i'.
# - Accept initial FTP connection and add the source ip to ftpdata recent list 'ftpdata_$i'.
# -
$ip6t -A FORWARD -p tcp -m state --state NEW -d $_ip --dport 21 -m recent --name ftp6data_$i --set -j ACCEPT
$ip6t -A FORWARD -p tcp -m state --state NEW -d $_ip --dport 21 -m recent --name ftpdata_$i --set -j ACCEPT
# - (2)
# - - Accept packets if the source ip-address is in the 'ftp6data_$i' list (--update) and the
# - - Accept packets if the source ip-address is in the 'ftpdata_$i' list (--update) and the
# - source ip-address was seen within the last 1800 seconds (--seconds 1800).
# -
# - - If matched, the "last seen" timestamp of the source address will be updated (--update).
# -
# - - Entries in the ftp6data list not seen in the last 1800 will be removed (--reap).
# - - Entries in the ftpdata list not seen in the last 1800 will be removed (--reap).
# -
$ip6t -A FORWARD -p tcp -m state --state NEW --sport 1024: -d $_ip --dport $ftp_passive_port_range \
-m recent --name ftp6data_$i --update --seconds 1800 --reap -j ACCEPT
-m recent --name ftpdata_$i --update --seconds 1800 --reap -j ACCEPT
$ip6t -A FORWARD -p tcp -m state --state NEW --dport 1024: -s $_ip --sport $ftp_passive_port_range \
-m recent --name ftp6data_$i --update --seconds 1800 --reap -j ACCEPT
-m recent --name ftpdata_$i --update --seconds 1800 --reap -j ACCEPT
# - Accept (helper ftp) related connections
# -

26
ipt-firewall-server
View File

@ -1574,14 +1574,36 @@ echononl "\t\tFTP out only (using CT target)"
# -
$ipt -A OUTPUT -t raw -p tcp --dport 21 -j CT --helper ftp
# - Used for different ftpdata recent lists 'ftpdata_out_$j'
# -
declare -i j=1
for _dev in ${ext_if_arr[@]} ; do
# - Open FTP connection
$ipt -A OUTPUT -o $_dev -p tcp --dport 21 -m state --state NEW -j ACCEPT
# - (1)
# -
# - Open FTP connection and add the destination ip (--rdest) to ftpdata recent list 'ftpdata_out_$j'.
# -
$ipt -A OUTPUT -o $_dev -p tcp --dport 21 -m state --state NEW \
-m recent --name ftpdata_out_$j --rdest --set -j ACCEPT
# - (2)
# - - Accept packets if the destination ip-address (--rdest) is in the 'ftpdata_$j' list (--update)
# - and the destination ip-address was seen within the last 1800 seconds (--seconds 1800).
# -
# - - If matched, the "last seen" timestamp of the destination address will be updated (--update).
# -
# - - Entries in the ftpdata list not seen in the last 1800 will be removed (--reap).
# -
$ipt -A OUTPUT -o $_dev -p tcp -m state --state NEW --dport 1024: \
-m recent --name ftpdata_out_$j --rdest --update --seconds 1800 --reap -j ACCEPT
((i++))
# - Accept (helper ftp) related connections
# -
$ipt -A OUTPUT -m conntrack --ctstate RELATED -m helper --helper ftp -o $_dev -p tcp --dport 1024: -j ACCEPT
done
echo_done