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1 | #!/bin/bash |
2 | ############################################################################### | |
3 | # # | |
4 | # IPFire.org - A linux based firewall # | |
5 | # Copyright (C) 2012 IPFire Network Development 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 | # High-level function which will create a ruleset for the current firewall | |
23 | # configuration and load it into the kernel. | |
24 | function firewall_start() { | |
25 | firewall_lock_acquire | |
26 | ||
27 | # Initialize an empty iptables ruleset. | |
28 | iptables_init DROP | |
29 | ||
30 | # Add default chains. | |
31 | firewall_tcp_state_flags | |
32 | firewall_connection_tracking | |
33 | ||
34 | # Add policies for every zone. | |
35 | policy_add_localhost | |
36 | ||
37 | local zone | |
38 | for zone in $(zones_get_all); do | |
39 | policy_add_zone ${zone} | |
40 | done | |
41 | ||
42 | # Commit the new ruleset. | |
43 | iptables_commit | |
44 | ||
45 | firewall_lock_release | |
46 | } | |
47 | ||
48 | function firewall_stop() { | |
49 | firewall_lock_acquire | |
50 | ||
51 | # Initialize an empty firewall ruleset | |
52 | # with default policy ACCEPT. | |
53 | iptables_init ACCEPT | |
54 | ||
55 | # Commit it. | |
56 | iptables_commit | |
57 | ||
58 | firewall_lock_release | |
59 | } | |
60 | ||
61 | function firewall_lock_acquire() { | |
62 | lock_acquire ${RUN_DIR}/.firewall_lock | |
63 | ||
64 | # Make sure the lock is released after the firewall | |
65 | # script has crashed or exited early. | |
66 | trap firewall_lock_release EXIT TERM KILL | |
67 | ||
68 | # Create a directory where we can put our | |
69 | # temporary data in the most secure way as possible. | |
70 | IPTABLES_TMPDIR=$(mktemp -d) | |
71 | } | |
72 | ||
73 | function firewall_lock_release() { | |
74 | if isset IPTABLES_TMPDIR; then | |
75 | # Remove all temporary data. | |
76 | rm -rf ${IPTABLES_TMPDIR} | |
77 | ||
78 | # Reset the tempdir variable. | |
79 | IPTABLES_TMPDIR= | |
80 | fi | |
81 | ||
82 | # Reset the trap. | |
83 | trap true EXIT TERM KILL | |
84 | ||
85 | lock_release ${RUN_DIR}/.firewall_lock | |
86 | } | |
87 | ||
88 | function firewall_tcp_state_flags() { | |
89 | log INFO "Creating TCP State Flags chain..." | |
90 | iptables_chain_create BADTCP_LOG | |
91 | iptables -A BADTCP_LOG -p tcp -j $(iptables_LOG "Illegal TCP state: ") | |
92 | iptables -A BADTCP_LOG -j DROP | |
93 | ||
94 | iptables_chain_create BADTCP | |
95 | iptables -A BADTCP -p tcp --tcp-flags ALL NONE -j BADTCP_LOG | |
96 | iptables -A BADTCP -p tcp --tcp-flags SYN,FIN SYN,FIN -j BADTCP_LOG | |
97 | iptables -A BADTCP -p tcp --tcp-flags SYN,RST SYN,RST -j BADTCP_LOG | |
98 | iptables -A BADTCP -p tcp --tcp-flags FIN,RST FIN,RST -j BADTCP_LOG | |
99 | iptables -A BADTCP -p tcp --tcp-flags ACK,FIN FIN -j BADTCP_LOG | |
100 | iptables -A BADTCP -p tcp --tcp-flags ACK,PSH PSH -j BADTCP_LOG | |
101 | iptables -A BADTCP -p tcp --tcp-flags ACK,URG URG -j BADTCP_LOG | |
102 | ||
103 | iptables -A INPUT -p tcp -j BADTCP | |
104 | iptables -A OUTPUT -p tcp -j BADTCP | |
105 | iptables -A FORWARD -p tcp -j BADTCP | |
106 | } | |
107 | ||
108 | function firewall_connection_tracking() { | |
109 | log INFO "Creating Connection Tracking chain..." | |
110 | iptables_chain_create CONNTRACK | |
111 | iptables -A CONNTRACK -m state --state ESTABLISHED,RELATED -j ACCEPT | |
112 | iptables -A CONNTRACK -m state --state INVALID -j $(iptables_LOG "INVALID packet: ") | |
113 | iptables -A CONNTRACK -m state --state INVALID -j DROP | |
114 | ||
115 | iptables -A INPUT -j CONNTRACK | |
116 | iptables -A OUTPUT -j CONNTRACK | |
117 | iptables -A FORWARD -j CONNTRACK | |
118 | } | |
3647b19f MT |
119 | |
120 | function firewall_import_portfw() { | |
121 | local zone=${1} | |
122 | shift | |
123 | ||
124 | local protocol="ipv6" | |
125 | local chain="filter" | |
126 | ||
127 | while [ $# -gt 0 ]; do | |
128 | case "${1}" in | |
129 | --chain=*) | |
130 | chain=$(cli_get_val ${1}) | |
131 | ;; | |
132 | --protocol=*) | |
133 | protocol=$(cli_get_val ${1}) | |
134 | ;; | |
135 | esac | |
136 | done | |
137 | ||
138 | assert isoneof protocol ipv4 ipv6 | |
139 | ||
140 | local allowed_chains="filter" | |
141 | if [ "${protocol}" = "ipv4" ]; then | |
142 | allowed_chains="${allowed_chains} nat" | |
143 | fi | |
144 | assert isoneof chain ${allowed_chains} | |
145 | ||
146 | # XXX TODO | |
147 | ||
148 | local src dst proto | |
149 | while read src dst proto; do | |
150 | case "${chain}" in | |
151 | filter) | |
152 | ;; | |
153 | nat) | |
154 | ;; | |
155 | esac | |
156 | done < ${FIREWALL_CONFIG_PORTFW} | |
157 | } |