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80fbd899 MT |
1 | #!/bin/bash |
2 | ############################################################################### | |
3 | # # | |
4 | # IPFire.org - A linux based firewall # | |
5 | # Copyright (C) 2015 IPFire Team # | |
6 | # # | |
7 | # This program is free software: you can redistribute it and/or modify # | |
8 | # it under the terms of the GNU General Public License as published by # | |
9 | # the Free Software Foundation, either version 3 of the License, or # | |
10 | # (at your option) any later version. # | |
11 | # # | |
12 | # This program is distributed in the hope that it will be useful, # | |
13 | # but WITHOUT ANY WARRANTY; without even the implied warranty of # | |
14 | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the # | |
15 | # GNU General Public License for more details. # | |
16 | # # | |
17 | # You should have received a copy of the GNU General Public License # | |
18 | # along with this program. If not, see <http://www.gnu.org/licenses/>. # | |
19 | # # | |
20 | ############################################################################### | |
21 | ||
22 | VPN_CONFIG="/var/ipfire/vpn/config" | |
23 | ||
6cf8bc91 MT |
24 | eval $(/usr/local/bin/readhash /var/ipfire/vpn/settings) |
25 | ||
6c920b19 MT |
26 | VARS=( |
27 | id status name lefthost type ctype x1 x2 x3 leftsubnets | |
2704dbbc | 28 | remote righthost rightsubnets x5 x6 x7 x8 x9 x10 x11 x12 |
6c920b19 | 29 | x13 x14 x15 x16 x17 x18 x19 x20 x21 proto x22 x23 x24 |
2704dbbc | 30 | route x26 mode interface_mode interface_address interface_mtu rest |
6c920b19 MT |
31 | ) |
32 | ||
80fbd899 MT |
33 | block_subnet() { |
34 | local subnet="${1}" | |
cda384a2 | 35 | local action="${2}" |
80fbd899 MT |
36 | |
37 | # Don't block a wildcard subnet | |
38 | if [ "${subnet}" = "0.0.0.0/0" ] || [ "${subnet}" = "0.0.0.0/0.0.0.0" ]; then | |
39 | return 0 | |
40 | fi | |
41 | ||
cda384a2 MT |
42 | case "${action}" in |
43 | reject) | |
44 | iptables -A IPSECBLOCK -d "${subnet}" -j REJECT --reject-with icmp-net-unreachable | |
45 | ;; | |
46 | drop) | |
47 | iptables -A IPSECBLOCK -d "${subnet}" -j DROP | |
48 | ;; | |
49 | *) | |
50 | return 1 | |
51 | ;; | |
52 | esac | |
53 | ||
54 | return 0 | |
80fbd899 MT |
55 | } |
56 | ||
6c920b19 | 57 | install_policy() { |
6cf8bc91 MT |
58 | # Flush existing rules |
59 | iptables -F IPSECINPUT | |
60 | iptables -F IPSECOUTPUT | |
80fbd899 MT |
61 | iptables -F IPSECBLOCK |
62 | ||
6cf8bc91 MT |
63 | # We are done when IPsec is not enabled |
64 | [ "${ENABLED}" = "on" ] || exit 0 | |
65 | ||
66 | # IKE | |
67 | iptables -A IPSECINPUT -p udp --dport 500 -j ACCEPT | |
68 | iptables -A IPSECOUTPUT -p udp --dport 500 -j ACCEPT | |
69 | ||
70 | # IKE NAT | |
71 | iptables -A IPSECINPUT -p udp --dport 4500 -j ACCEPT | |
72 | iptables -A IPSECOUTPUT -p udp --dport 4500 -j ACCEPT | |
73 | ||
cda384a2 | 74 | # Register local variables |
6c920b19 MT |
75 | local "${VARS[@]}" |
76 | local action | |
cda384a2 | 77 | |
6c920b19 | 78 | while IFS="," read -r "${VARS[@]}"; do |
80fbd899 MT |
79 | # Check if the connection is enabled |
80 | [ "${status}" = "on" ] || continue | |
81 | ||
82 | # Check if this a net-to-net connection | |
83 | [ "${type}" = "net" ] || continue | |
84 | ||
b54cd874 MT |
85 | # Install permissions for GRE traffic |
86 | case "${interface_mode}" in | |
87 | gre) | |
88 | if [ -n "${remote}" ]; then | |
89 | iptables -A IPSECINPUT -p gre \ | |
90 | -s "${remote}" -j ACCEPT | |
91 | ||
92 | iptables -A IPSECOUTPUT -p gre \ | |
93 | -d "${remote}" -j ACCEPT | |
94 | fi | |
95 | ;; | |
96 | esac | |
97 | ||
5a9c9ff3 MT |
98 | # Install firewall rules only for interfaces without interface |
99 | [ -n "${interface_mode}" ] && continue | |
100 | ||
80fbd899 MT |
101 | # Split multiple subnets |
102 | rightsubnets="${rightsubnets//\|/ }" | |
103 | ||
cda384a2 MT |
104 | case "${route}" in |
105 | route) | |
106 | action="drop" | |
107 | ;; | |
108 | *) | |
109 | action="reject" | |
110 | ;; | |
111 | esac | |
112 | ||
80fbd899 MT |
113 | local rightsubnet |
114 | for rightsubnet in ${rightsubnets}; do | |
cda384a2 | 115 | block_subnet "${rightsubnet}" "${action}" |
80fbd899 MT |
116 | done |
117 | done < "${VPN_CONFIG}" | |
118 | } | |
119 | ||
6c920b19 | 120 | install_policy || exit $? |