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 -t nat -N CUSTOMPREROUTING
  91         /sbin/iptables -t nat -A PREROUTING -j CUSTOMPREROUTING
  92         /sbin/iptables -t nat -N CUSTOMPOSTROUTING
  93         /sbin/iptables -t nat -A POSTROUTING -j CUSTOMPOSTROUTING
  94
  95         # Guardian (IPS) chains
  96         /sbin/iptables -N GUARDIAN
  97         /sbin/iptables -A INPUT -j GUARDIAN
  98         /sbin/iptables -A FORWARD -j GUARDIAN
  99
 100         # Block OpenVPN transfer networks
 101         /sbin/iptables -N OVPNBLOCK
 102         for i in INPUT FORWARD OUTPUT; do
 103                 /sbin/iptables -A ${i} -j OVPNBLOCK
 104         done
 105
 106         # OpenVPN transfer network translation
 107         /sbin/iptables -t nat -N OVPNNAT
 108         /sbin/iptables -t nat -A POSTROUTING -j OVPNNAT
 109
 110         # IPTV chains for IGMPPROXY
 111         /sbin/iptables -N IPTVINPUT
 112         /sbin/iptables -A INPUT -j IPTVINPUT
 113         /sbin/iptables -N IPTVFORWARD
 114         /sbin/iptables -A FORWARD -j IPTVFORWARD
 115
 116         # filtering from GUI
 117         /sbin/iptables -N GUIINPUT
 118         /sbin/iptables -A INPUT -j GUIINPUT
 119         /sbin/iptables -A GUIINPUT -p icmp --icmp-type 8 -j ACCEPT
 120
 121         # Accept everything on loopback
 122         /sbin/iptables -N LOOPBACK
 123         /sbin/iptables -A LOOPBACK -i lo -j ACCEPT
 124         /sbin/iptables -A LOOPBACK -o lo -j ACCEPT
 125
 126         # Filter all packets with loopback addresses on non-loopback interfaces.
 127         /sbin/iptables -A LOOPBACK -s 127.0.0.0/8 -j DROP
 128         /sbin/iptables -A LOOPBACK -d 127.0.0.0/8 -j DROP
 129
 130         for i in INPUT FORWARD OUTPUT; do
 131                 /sbin/iptables -A ${i} -j LOOPBACK
 132         done
 133
 134         # Accept everything connected
 135         for i in INPUT FORWARD OUTPUT; do
 136                 /sbin/iptables -A ${i} -j CONNTRACK
 137         done
 138
 139         # trafic from ipsecX/TUN/TAP interfaces, before "-i GREEN_DEV" accept everything
 140         /sbin/iptables -N IPSECINPUT
 141         /sbin/iptables -N IPSECFORWARD
 142         /sbin/iptables -N IPSECOUTPUT
 143         /sbin/iptables -A INPUT -j IPSECINPUT
 144         /sbin/iptables -A FORWARD -j IPSECFORWARD
 145         /sbin/iptables -A OUTPUT -j IPSECOUTPUT
 146         /sbin/iptables -t nat -N IPSECNAT
 147         /sbin/iptables -t nat -A POSTROUTING -j IPSECNAT
 148
 149         # localhost and ethernet.
 150         /sbin/iptables -A INPUT   -i $GREEN_DEV  -m conntrack --ctstate NEW -j ACCEPT ! -p icmp
 151
 152         # allow DHCP on BLUE to be turned on/off
 153         /sbin/iptables -N DHCPBLUEINPUT
 154         /sbin/iptables -A INPUT -j DHCPBLUEINPUT
 155
 156         # WIRELESS chains
 157         /sbin/iptables -N WIRELESSINPUT
 158         /sbin/iptables -A INPUT -m conntrack --ctstate NEW -j WIRELESSINPUT
 159         /sbin/iptables -N WIRELESSFORWARD
 160         /sbin/iptables -A FORWARD -m conntrack --ctstate NEW -j WIRELESSFORWARD
 161
 162         # TOR
 163         /sbin/iptables -N TOR_INPUT
 164         /sbin/iptables -A INPUT -j TOR_INPUT
 165
 166         # Jump into the actual firewall ruleset.
 167         /sbin/iptables -N INPUTFW
 168         /sbin/iptables -A INPUT -j INPUTFW
 169
 170         /sbin/iptables -N OUTGOINGFW
 171         /sbin/iptables -A OUTPUT -j OUTGOINGFW
 172
 173         /sbin/iptables -N FORWARDFW
 174         /sbin/iptables -A FORWARD -j FORWARDFW
 175
 176         # RED chain, used for the red interface
 177         /sbin/iptables -N REDINPUT
 178         /sbin/iptables -A INPUT -j REDINPUT
 179         /sbin/iptables -N REDFORWARD
 180         /sbin/iptables -A FORWARD -j REDFORWARD
 181         /sbin/iptables -t nat -N REDNAT
 182         /sbin/iptables -t nat -A POSTROUTING -j REDNAT
 183
 184         iptables_red
 185
 186         # Custom prerouting chains (for transparent proxy)
 187         /sbin/iptables -t nat -N SQUID
 188         /sbin/iptables -t nat -A PREROUTING -j SQUID
 189
 190         # DNAT rules
 191         /sbin/iptables -t nat -N NAT_DESTINATION
 192         /sbin/iptables -t nat -A PREROUTING -j NAT_DESTINATION
 193
 194         # SNAT rules
 195         /sbin/iptables -t nat -N NAT_SOURCE
 196         /sbin/iptables -t nat -A POSTROUTING -j NAT_SOURCE
 197
 198         # upnp chain for our upnp daemon
 199         /sbin/iptables -t nat -N UPNPFW
 200         /sbin/iptables -t nat -A PREROUTING -j UPNPFW
 201         /sbin/iptables -N UPNPFW
 202         /sbin/iptables -A FORWARD -m conntrack --ctstate NEW -j UPNPFW
 203
 204         # run local firewall configuration, if present
 205         if [ -x /etc/sysconfig/firewall.local ]; then
 206                 /etc/sysconfig/firewall.local start
 207         fi
 208
 209         # run openvpn
 210         /usr/local/bin/openvpnctrl --create-chains-and-rules
 211
 212         # run wirelessctrl
 213         /usr/local/bin/wirelessctrl
 214
 215         #POLICY CHAIN
 216         /sbin/iptables -N POLICYIN
 217         /sbin/iptables -A INPUT -j POLICYIN
 218         /sbin/iptables -N POLICYFWD
 219         /sbin/iptables -A FORWARD -j POLICYFWD
 220         /sbin/iptables -N POLICYOUT
 221         /sbin/iptables -A OUTPUT -j POLICYOUT
 222
 223         /usr/sbin/firewall-policy
 224
 225         # read new firewall
 226         /usr/local/bin/firewallctrl
 227
 228         if [ "$DROPINPUT" == "on" ]; then
 229                 /sbin/iptables -A INPUT   -m limit --limit 10/minute -j LOG --log-prefix "DROP_INPUT"
 230         fi
 231         /sbin/iptables -A INPUT -j DROP -m comment --comment "DROP_INPUT"
 232         if [ "$DROPFORWARD" == "on" ]; then
 233                 /sbin/iptables -A FORWARD -m limit --limit 10/minute -j LOG --log-prefix "DROP_FORWARD"
 234         fi
 235         /sbin/iptables -A FORWARD -j DROP -m comment --comment "DROP_FORWARD"
 236 }
 237
 238 iptables_red() {
 239         /sbin/iptables -F REDINPUT
 240         /sbin/iptables -F REDFORWARD
 241         /sbin/iptables -t nat -F REDNAT
 242
 243         # PPPoE / PPTP Device
 244         if [ "$IFACE" != "" ]; then
 245                 # PPPoE / PPTP
 246                 if [ "$DEVICE" != "" ]; then
 247                         /sbin/iptables -A REDINPUT -i $DEVICE -j ACCEPT
 248                 fi
 249                 if [ "$RED_TYPE" == "PPTP" -o "$RED_TYPE" == "PPPOE" ]; then
 250                         if [ "$RED_DEV" != "" ]; then
 251                                 /sbin/iptables -A REDINPUT -i $RED_DEV -j ACCEPT
 252                         fi
 253                 fi
 254         fi
 255
 256         # PPTP over DHCP
 257         if [ "$DEVICE" != "" -a "$TYPE" == "PPTP" -a "$METHOD" == "DHCP" ]; then
 258                 /sbin/iptables -A REDINPUT -p tcp --source-port 67 --destination-port 68 -i $DEVICE -j ACCEPT
 259                 /sbin/iptables -A REDINPUT -p udp --source-port 67 --destination-port 68 -i $DEVICE -j ACCEPT
 260         fi
 261
 262         # Orange pinholes
 263         if [ "$ORANGE_DEV" != "" ]; then
 264                 # This rule enables a host on ORANGE network to connect to the outside
 265                 # (only if we have a red connection)
 266                 if [ "$IFACE" != "" ]; then
 267                         /sbin/iptables -A REDFORWARD -i $ORANGE_DEV -o $IFACE -j ACCEPT
 268                 fi
 269         fi
 270
 271         if [ "$IFACE" != "" -a -f /var/ipfire/red/active ]; then
 272                 # DHCP
 273                 if [ "$RED_DEV" != "" -a "$RED_TYPE" == "DHCP" ]; then
 274                         /sbin/iptables -A REDINPUT -p tcp --source-port 67 --destination-port 68 -i $IFACE -j ACCEPT
 275                         /sbin/iptables -A REDINPUT -p udp --source-port 67 --destination-port 68 -i $IFACE -j ACCEPT
 276                 fi
 277                 if [ "$METHOD" == "DHCP"  -a "$PROTOCOL" == "RFC1483" ]; then
 278                         /sbin/iptables -A REDINPUT -p tcp --source-port 67 --destination-port 68 -i $IFACE -j ACCEPT
 279                         /sbin/iptables -A REDINPUT -p udp --source-port 67 --destination-port 68 -i $IFACE -j ACCEPT
 280                 fi
 281
 282                 # Outgoing masquerading (don't masqerade IPSEC (mark 50))
 283                 /sbin/iptables -t nat -A REDNAT -m mark --mark 50 -o $IFACE -j RETURN
 284                 /sbin/iptables -t nat -A REDNAT -o $IFACE -j MASQUERADE
 285
 286         fi
 287 }
 288
 289 # See how we were called.
 290 case "$1" in
 291   start)
 292         iptables_init
 293         ;;
 294   reload)
 295         iptables_red
 296         # run local firewall configuration, if present
 297         if [ -x /etc/sysconfig/firewall.local ]; then
 298                 /etc/sysconfig/firewall.local reload
 299         fi
 300         ;;
 301   restart)
 302         # run local firewall configuration, if present
 303         if [ -x /etc/sysconfig/firewall.local ]; then
 304                 /etc/sysconfig/firewall.local stop
 305         fi
 306         $0 start
 307         ;;
 308   *)
 309         echo "Usage: $0 {start|reload|restart}"
 310         exit 1
 311         ;;
 312 esac
 313
 314 exit 0