src/initscripts/init.d/firewall

   1 #!/bin/sh
   2
   3 eval $(/usr/local/bin/readhash /var/ipfire/ppp/settings)
   4 eval $(/usr/local/bin/readhash /var/ipfire/ethernet/settings)
   5 eval $(/usr/local/bin/readhash /var/ipfire/optionsfw/settings)
   6 IFACE=`/bin/cat /var/ipfire/red/iface 2> /dev/null | /usr/bin/tr -d '\012'`
   7
   8 if [ -f /var/ipfire/red/device ]; then
   9         DEVICE=`/bin/cat /var/ipfire/red/device 2> /dev/null | /usr/bin/tr -d '\012'`
  10 fi
  11
  12 iptables_init() {
  13         # Flush all rules and delete all custom chains
  14         /sbin/iptables -F
  15         /sbin/iptables -t nat -F
  16         /sbin/iptables -t mangle -F
  17         /sbin/iptables -X
  18         /sbin/iptables -t nat -X
  19         /sbin/iptables -t mangle -X
  20
  21         # Set up policies
  22         /sbin/iptables -P INPUT DROP
  23         /sbin/iptables -P FORWARD DROP
  24         /sbin/iptables -P OUTPUT ACCEPT
  25
  26         # Empty LOG_DROP and LOG_REJECT chains
  27         /sbin/iptables -N LOG_DROP
  28         /sbin/iptables -A LOG_DROP   -m limit --limit 10/minute -j LOG
  29         /sbin/iptables -A LOG_DROP   -j DROP
  30         /sbin/iptables -N LOG_REJECT
  31         /sbin/iptables -A LOG_REJECT -m limit --limit 10/minute -j LOG
  32         /sbin/iptables -A LOG_REJECT -j REJECT
  33
  34         # This chain will log, then DROPs packets with certain bad combinations
  35         # of flags might indicate a port-scan attempt (xmas, null, etc)
  36         /sbin/iptables -N PSCAN
  37         if [ "$DROPPORTSCAN" == "on" ]; then
  38                 /sbin/iptables -A PSCAN -p tcp  -m limit --limit 10/minute -j LOG --log-prefix "DROP_TCP Scan " -m comment --comment "DROP_TCP PScan"
  39                 /sbin/iptables -A PSCAN -p udp  -m limit --limit 10/minute -j LOG --log-prefix "DROP_UDP Scan " -m comment --comment "DROP_UDP PScan"
  40                 /sbin/iptables -A PSCAN -p icmp -m limit --limit 10/minute -j LOG --log-prefix "DROP_ICMP Scan " -m comment --comment "DROP_ICMP PScan"
  41                 /sbin/iptables -A PSCAN -f      -m limit --limit 10/minute -j LOG --log-prefix "DROP_FRAG Scan " -m comment --comment "DROP_FRAG PScan"
  42         fi
  43         /sbin/iptables -A PSCAN -j DROP -m comment --comment "DROP_PScan"
  44
  45         # New tcp packets without SYN set - could well be an obscure type of port scan
  46         # that's not covered above, may just be a broken windows machine
  47         /sbin/iptables -N NEWNOTSYN
  48         if [ "$DROPNEWNOTSYN" == "on" ]; then
  49                 /sbin/iptables -A NEWNOTSYN  -m limit --limit 10/minute -j LOG  --log-prefix "DROP_NEWNOTSYN "
  50         fi
  51         /sbin/iptables -A NEWNOTSYN  -j DROP -m comment --comment "DROP_NEWNOTSYN"
  52
  53         # Chain to contain all the rules relating to bad TCP flags
  54         /sbin/iptables -N BADTCP
  55
  56         #Don't check loopback
  57         /sbin/iptables -A BADTCP -i lo -j RETURN
  58
  59         # Disallow packets frequently used by port-scanners
  60         # nmap xmas
  61         /sbin/iptables -A BADTCP -p tcp --tcp-flags ALL FIN,URG,PSH  -j PSCAN
  62         # Null
  63         /sbin/iptables -A BADTCP -p tcp --tcp-flags ALL NONE -j PSCAN
  64         # FIN
  65         /sbin/iptables -A BADTCP -p tcp --tcp-flags ALL FIN -j PSCAN
  66         # SYN/RST (also catches xmas variants that set SYN+RST+...)
  67         /sbin/iptables -A BADTCP -p tcp --tcp-flags SYN,RST SYN,RST -j PSCAN
  68         # SYN/FIN (QueSO or nmap OS probe)
  69         /sbin/iptables -A BADTCP -p tcp --tcp-flags SYN,FIN SYN,FIN -j PSCAN
  70         # NEW TCP without SYN
  71         /sbin/iptables -A BADTCP -p tcp ! --syn -m conntrack --ctstate NEW -j NEWNOTSYN
  72
  73         /sbin/iptables -A INPUT   -p tcp -j BADTCP
  74         /sbin/iptables -A FORWARD -p tcp -j BADTCP
  75
  76         # Connection tracking chain
  77         /sbin/iptables -N CONNTRACK
  78         /sbin/iptables -A CONNTRACK -m conntrack --ctstate ESTABLISHED,RELATED -j ACCEPT
  79
  80         # Fix for braindead ISP's
  81         /sbin/iptables -A FORWARD -p tcp --tcp-flags SYN,RST SYN -j TCPMSS --clamp-mss-to-pmtu
  82
  83         # CUSTOM chains, can be used by the users themselves
  84         /sbin/iptables -N CUSTOMINPUT
  85         /sbin/iptables -A INPUT -j CUSTOMINPUT
  86         /sbin/iptables -N CUSTOMFORWARD
  87         /sbin/iptables -A FORWARD -j CUSTOMFORWARD
  88         /sbin/iptables -N CUSTOMOUTPUT
  89         /sbin/iptables -A OUTPUT -j CUSTOMOUTPUT
  90         /sbin/iptables -N OUTGOINGFW
  91         /sbin/iptables -A OUTPUT -j OUTGOINGFW
  92         /sbin/iptables -t nat -N CUSTOMPREROUTING
  93         /sbin/iptables -t nat -A PREROUTING -j CUSTOMPREROUTING
  94         /sbin/iptables -t nat -N CUSTOMPOSTROUTING
  95         /sbin/iptables -t nat -A POSTROUTING -j CUSTOMPOSTROUTING
  96
  97         # Guardian (IPS) chains
  98         /sbin/iptables -N GUARDIAN
  99         /sbin/iptables -A INPUT -j GUARDIAN
 100         /sbin/iptables -A FORWARD -j GUARDIAN
 101
 102         # Block OpenVPN transfer networks
 103         /sbin/iptables -N OVPNBLOCK
 104         for i in INPUT FORWARD OUTPUT; do
 105                 /sbin/iptables -A ${i} -j OVPNBLOCK
 106         done
 107
 108         # OpenVPN transfer network translation
 109         /sbin/iptables -t nat -N OVPNNAT
 110         /sbin/iptables -t nat -A POSTROUTING -j OVPNNAT
 111
 112         # IPTV chains for IGMPPROXY
 113         /sbin/iptables -N IPTVINPUT
 114         /sbin/iptables -A INPUT -j IPTVINPUT
 115         /sbin/iptables -N IPTVFORWARD
 116         /sbin/iptables -A FORWARD -j IPTVFORWARD
 117
 118         # filtering from GUI
 119         /sbin/iptables -N GUIINPUT
 120         /sbin/iptables -A INPUT -j GUIINPUT
 121         /sbin/iptables -A GUIINPUT -p icmp --icmp-type 8 -j ACCEPT
 122
 123         # Accept everything on loopback
 124         /sbin/iptables -N LOOPBACK
 125         /sbin/iptables -A LOOPBACK -i lo -j ACCEPT
 126         /sbin/iptables -A LOOPBACK -o lo -j ACCEPT
 127
 128         # Filter all packets with loopback addresses on non-loopback interfaces.
 129         /sbin/iptables -A LOOPBACK -s 127.0.0.0/8 -j DROP
 130         /sbin/iptables -A LOOPBACK -d 127.0.0.0/8 -j DROP
 131
 132         for i in INPUT FORWARD OUTPUT; do
 133                 /sbin/iptables -A ${i} -j LOOPBACK
 134         done
 135
 136         # Accept everything connected
 137         for i in INPUT FORWARD OUTPUT; do
 138                 /sbin/iptables -A ${i} -j CONNTRACK
 139         done
 140
 141         # trafic from ipsecX/TUN/TAP interfaces, before "-i GREEN_DEV" accept everything
 142         /sbin/iptables -N IPSECINPUT
 143         /sbin/iptables -N IPSECFORWARD
 144         /sbin/iptables -N IPSECOUTPUT
 145         /sbin/iptables -N OPENSSLVIRTUAL
 146         /sbin/iptables -A INPUT -j IPSECINPUT
 147         /sbin/iptables -A INPUT -j OPENSSLVIRTUAL -m comment --comment "OPENSSLVIRTUAL INPUT"
 148         /sbin/iptables -A FORWARD -j IPSECFORWARD
 149         /sbin/iptables -A FORWARD -j OPENSSLVIRTUAL -m comment --comment "OPENSSLVIRTUAL FORWARD"
 150         /sbin/iptables -A OUTPUT -j IPSECOUTPUT
 151         /sbin/iptables -t nat -N IPSECNAT
 152         /sbin/iptables -t nat -A POSTROUTING -j IPSECNAT
 153
 154         # Input Firewall
 155         /sbin/iptables -N INPUTFW
 156         /sbin/iptables -A INPUT -m conntrack --ctstate NEW -j INPUTFW
 157
 158         # localhost and ethernet.
 159         /sbin/iptables -A INPUT   -i $GREEN_DEV  -m conntrack --ctstate NEW -j ACCEPT ! -p icmp
 160
 161         # allow DHCP on BLUE to be turned on/off
 162         /sbin/iptables -N DHCPBLUEINPUT
 163         /sbin/iptables -A INPUT -j DHCPBLUEINPUT
 164
 165         # WIRELESS chains
 166         /sbin/iptables -N WIRELESSINPUT
 167         /sbin/iptables -A INPUT -m conntrack --ctstate NEW -j WIRELESSINPUT
 168         /sbin/iptables -N WIRELESSFORWARD
 169         /sbin/iptables -A FORWARD -m conntrack --ctstate NEW -j WIRELESSFORWARD
 170
 171         # Forward Firewall
 172         /sbin/iptables -N FORWARDFW
 173         /sbin/iptables -A FORWARD -j FORWARDFW
 174
 175         # OPenSSL
 176         /sbin/iptables -N OPENSSLPHYSICAL
 177         /sbin/iptables -A INPUT -j OPENSSLPHYSICAL
 178
 179         # RED chain, used for the red interface
 180         /sbin/iptables -N REDINPUT
 181         /sbin/iptables -A INPUT -j REDINPUT
 182         /sbin/iptables -N REDFORWARD
 183         /sbin/iptables -A FORWARD -j REDFORWARD
 184         /sbin/iptables -t nat -N REDNAT
 185         /sbin/iptables -t nat -A POSTROUTING -j REDNAT
 186
 187         iptables_red
 188
 189         # Custom prerouting chains (for transparent proxy and port forwarding)
 190         /sbin/iptables -t nat -N SQUID
 191         /sbin/iptables -t nat -A PREROUTING -j SQUID
 192         /sbin/iptables -t nat -N NAT_DESTINATION
 193         /sbin/iptables -t nat -N NAT_SOURCE
 194         /sbin/iptables -t nat -A PREROUTING -j NAT_DESTINATION
 195         /sbin/iptables -t nat -I POSTROUTING 3 -j NAT_SOURCE
 196
 197
 198
 199         # upnp chain for our upnp daemon
 200         /sbin/iptables -t nat -N UPNPFW
 201         /sbin/iptables -t nat -A PREROUTING -j UPNPFW
 202         /sbin/iptables -N UPNPFW
 203         /sbin/iptables -A FORWARD -m conntrack --ctstate NEW -j UPNPFW
 204
 205         # Postrouting rules (for port forwarding)
 206         /sbin/iptables -t nat -A POSTROUTING -m mark --mark 1 -j SNAT --to-source $GREEN_ADDRESS
 207         if [ "$BLUE_DEV" != "" ]; then
 208                 /sbin/iptables -t nat -A POSTROUTING -m mark --mark 2 -j SNAT --to-source $BLUE_ADDRESS
 209         fi
 210         if [ "$ORANGE_DEV" != "" ]; then
 211                 /sbin/iptables -t nat -A POSTROUTING -m mark --mark 3 -j SNAT --to-source $ORANGE_ADDRESS
 212         fi
 213
 214         # run local firewall configuration, if present
 215         if [ -x /etc/sysconfig/firewall.local ]; then
 216                 /etc/sysconfig/firewall.local start
 217         fi
 218
 219         # run openvpn
 220         /usr/local/bin/openvpnctrl --create-chains-and-rules
 221
 222         # run wirelessctrl
 223         /usr/local/bin/wirelessctrl
 224
 225         #POLICY CHAIN
 226         /sbin/iptables -N POLICYIN
 227         /sbin/iptables -A INPUT -j POLICYIN
 228         /sbin/iptables -N POLICYFWD
 229         /sbin/iptables -A FORWARD -j POLICYFWD
 230         /sbin/iptables -N POLICYOUT
 231         /sbin/iptables -A OUTPUT -j POLICYOUT
 232
 233         /usr/sbin/firewall-policy
 234
 235         # read new firewall
 236         /usr/local/bin/forwardfwctrl
 237
 238         if [ "$DROPINPUT" == "on" ]; then
 239                 /sbin/iptables -A INPUT   -m limit --limit 10/minute -j LOG --log-prefix "DROP_INPUT"
 240         fi
 241         /sbin/iptables -A INPUT -j DROP -m comment --comment "DROP_INPUT"
 242         if [ "$DROPFORWARD" == "on" ]; then
 243                 /sbin/iptables -A FORWARD -m limit --limit 10/minute -j LOG --log-prefix "DROP_FORWARD"
 244         fi
 245         /sbin/iptables -A FORWARD -j DROP -m comment --comment "DROP_FORWARD"
 246 }
 247
 248 iptables_red() {
 249         /sbin/iptables -F REDINPUT
 250         /sbin/iptables -F REDFORWARD
 251         /sbin/iptables -t nat -F REDNAT
 252
 253         # PPPoE / PPTP Device
 254         if [ "$IFACE" != "" ]; then
 255                 # PPPoE / PPTP
 256                 if [ "$DEVICE" != "" ]; then
 257                         /sbin/iptables -A REDINPUT -i $DEVICE -j ACCEPT
 258                 fi
 259                 if [ "$RED_TYPE" == "PPTP" -o "$RED_TYPE" == "PPPOE" ]; then
 260                         if [ "$RED_DEV" != "" ]; then
 261                                 /sbin/iptables -A REDINPUT -i $RED_DEV -j ACCEPT
 262                         fi
 263                 fi
 264         fi
 265
 266         # PPTP over DHCP
 267         if [ "$DEVICE" != "" -a "$TYPE" == "PPTP" -a "$METHOD" == "DHCP" ]; then
 268                 /sbin/iptables -A REDINPUT -p tcp --source-port 67 --destination-port 68 -i $DEVICE -j ACCEPT
 269                 /sbin/iptables -A REDINPUT -p udp --source-port 67 --destination-port 68 -i $DEVICE -j ACCEPT
 270         fi
 271
 272         # Orange pinholes
 273         if [ "$ORANGE_DEV" != "" ]; then
 274                 # This rule enables a host on ORANGE network to connect to the outside
 275                 # (only if we have a red connection)
 276                 if [ "$IFACE" != "" ]; then
 277                         /sbin/iptables -A REDFORWARD -i $ORANGE_DEV -o $IFACE -j ACCEPT
 278                 fi
 279         fi
 280
 281         if [ "$IFACE" != "" -a -f /var/ipfire/red/active ]; then
 282                 # DHCP
 283                 if [ "$RED_DEV" != "" -a "$RED_TYPE" == "DHCP" ]; then
 284                         /sbin/iptables -A REDINPUT -p tcp --source-port 67 --destination-port 68 -i $IFACE -j ACCEPT
 285                         /sbin/iptables -A REDINPUT -p udp --source-port 67 --destination-port 68 -i $IFACE -j ACCEPT
 286                 fi
 287                 if [ "$METHOD" == "DHCP"  -a "$PROTOCOL" == "RFC1483" ]; then
 288                         /sbin/iptables -A REDINPUT -p tcp --source-port 67 --destination-port 68 -i $IFACE -j ACCEPT
 289                         /sbin/iptables -A REDINPUT -p udp --source-port 67 --destination-port 68 -i $IFACE -j ACCEPT
 290                 fi
 291
 292                 # Outgoing masquerading (don't masqerade IPSEC (mark 50))
 293                 /sbin/iptables -t nat -A REDNAT -m mark --mark 50 -o $IFACE -j RETURN
 294                 /sbin/iptables -t nat -A REDNAT -o $IFACE -j MASQUERADE
 295
 296         fi
 297 }
 298
 299 # See how we were called.
 300 case "$1" in
 301   start)
 302         iptables_init
 303         ;;
 304   reload)
 305         iptables_red
 306         # run local firewall configuration, if present
 307         if [ -x /etc/sysconfig/firewall.local ]; then
 308                 /etc/sysconfig/firewall.local reload
 309         fi
 310         ;;
 311   restart)
 312         # run local firewall configuration, if present
 313         if [ -x /etc/sysconfig/firewall.local ]; then
 314                 /etc/sysconfig/firewall.local stop
 315         fi
 316         $0 start
 317         ;;
 318   *)
 319         echo "Usage: $0 {start|reload|restart}"
 320         exit 1
 321         ;;
 322 esac
 323
 324 exit 0