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 state --state NEW -j NEWNOTSYN
  72
  73         /sbin/iptables -A INPUT   -j BADTCP
  74         /sbin/iptables -A FORWARD -j BADTCP
  75
  76         # Fix for braindead ISP's
  77         /sbin/iptables -A FORWARD -p tcp --tcp-flags SYN,RST SYN -j TCPMSS --clamp-mss-to-pmtu
  78
  79         # CUSTOM chains, can be used by the users themselves
  80         /sbin/iptables -N CUSTOMINPUT
  81         /sbin/iptables -A INPUT -j CUSTOMINPUT
  82         /sbin/iptables -N GUARDIAN
  83         /sbin/iptables -A INPUT -j GUARDIAN
  84         /sbin/iptables -N OVPNBLOCK
  85         /sbin/iptables -A FORWARD -j OVPNBLOCK
  86         /sbin/iptables -A FORWARD -j GUARDIAN
  87         /sbin/iptables -N CUSTOMFORWARD
  88         /sbin/iptables -A FORWARD -j CUSTOMFORWARD
  89         /sbin/iptables -N CUSTOMOUTPUT
  90         /sbin/iptables -A OUTPUT -j OVPNBLOCK
  91         /sbin/iptables -A OUTPUT -m state --state ESTABLISHED,RELATED -j ACCEPT
  92         /sbin/iptables -A OUTPUT -j CUSTOMOUTPUT
  93         /sbin/iptables -N OUTGOINGFW
  94         /sbin/iptables -A OUTPUT -j OUTGOINGFW
  95         /sbin/iptables -t nat -N CUSTOMPREROUTING
  96         /sbin/iptables -t nat -N OVPNNAT
  97         /sbin/iptables -t nat -A PREROUTING -j CUSTOMPREROUTING
  98         /sbin/iptables -t nat -N CUSTOMPOSTROUTING
  99         /sbin/iptables -t nat -A POSTROUTING -j CUSTOMPOSTROUTING
 100         /sbin/iptables -t nat -A POSTROUTING -j OVPNNAT
 101
 102         # IPTV chains for IGMPPROXY
 103         /sbin/iptables -N IPTVINPUT
 104         /sbin/iptables -A INPUT -j IPTVINPUT
 105         /sbin/iptables -N IPTVFORWARD
 106         /sbin/iptables -A FORWARD -j IPTVFORWARD
 107
 108         # Filtering ovpn networks INPUT
 109         /sbin/iptables -A INPUT -j OVPNBLOCK
 110
 111         # filtering from GUI
 112         /sbin/iptables -N GUIINPUT
 113         /sbin/iptables -A INPUT -j GUIINPUT
 114         /sbin/iptables -A GUIINPUT -p icmp --icmp-type 8 -j ACCEPT
 115
 116         # Accept everything connected
 117         /sbin/iptables -A INPUT   -m state --state ESTABLISHED,RELATED -j ACCEPT
 118         /sbin/iptables -A FORWARD -m state --state ESTABLISHED,RELATED -j ACCEPT
 119
 120         # Accept everything on lo
 121         iptables -A INPUT  -i lo -m state --state NEW -j ACCEPT
 122         iptables -A OUTPUT -o lo -m state --state NEW -j ACCEPT
 123
 124         # trafic from ipsecX/TUN/TAP interfaces, before "-i GREEN_DEV" accept everything
 125         /sbin/iptables -N IPSECINPUT
 126         /sbin/iptables -N IPSECFORWARD
 127         /sbin/iptables -N IPSECOUTPUT
 128         /sbin/iptables -N OPENSSLVIRTUAL
 129         /sbin/iptables -A INPUT -j IPSECINPUT
 130         /sbin/iptables -A INPUT -j OPENSSLVIRTUAL -m comment --comment "OPENSSLVIRTUAL INPUT"
 131         /sbin/iptables -A FORWARD -j IPSECFORWARD
 132         /sbin/iptables -A FORWARD -j OPENSSLVIRTUAL -m comment --comment "OPENSSLVIRTUAL FORWARD"
 133         /sbin/iptables -A OUTPUT -j IPSECOUTPUT
 134         /sbin/iptables -t nat -N IPSECNAT
 135         /sbin/iptables -t nat -A POSTROUTING -j IPSECNAT
 136
 137         # Input Firewall
 138         /sbin/iptables -N INPUTFW
 139         /sbin/iptables -A INPUT -m state --state NEW -j INPUTFW
 140
 141         # localhost and ethernet.
 142         /sbin/iptables -A INPUT   -i lo -m state --state NEW -j ACCEPT
 143         /sbin/iptables -A INPUT   -s 127.0.0.0/8 -m state --state NEW -j DROP   # Loopback not on lo
 144         /sbin/iptables -A INPUT   -d 127.0.0.0/8 -m state --state NEW -j DROP
 145         /sbin/iptables -A FORWARD -i lo -m state --state NEW -j ACCEPT
 146         /sbin/iptables -A FORWARD -s 127.0.0.0/8 -m state --state NEW -j DROP
 147         /sbin/iptables -A FORWARD -d 127.0.0.0/8 -m state --state NEW -j DROP
 148         /sbin/iptables -A INPUT   -i $GREEN_DEV  -m state --state NEW -j ACCEPT ! -p icmp
 149
 150         # allow DHCP on BLUE to be turned on/off
 151         /sbin/iptables -N DHCPBLUEINPUT
 152         /sbin/iptables -A INPUT -j DHCPBLUEINPUT
 153
 154         # WIRELESS chains
 155         /sbin/iptables -N WIRELESSINPUT
 156         /sbin/iptables -A INPUT -m state --state NEW -j WIRELESSINPUT
 157         /sbin/iptables -N WIRELESSFORWARD
 158         /sbin/iptables -A FORWARD -m state --state NEW -j WIRELESSFORWARD
 159
 160         # Forward Firewall
 161         /sbin/iptables -N FORWARDFW
 162         /sbin/iptables -A FORWARD -j FORWARDFW
 163
 164         # OPenSSL
 165         /sbin/iptables -N OPENSSLPHYSICAL
 166         /sbin/iptables -A INPUT -j OPENSSLPHYSICAL
 167
 168         # RED chain, used for the red interface
 169         /sbin/iptables -N REDINPUT
 170         /sbin/iptables -A INPUT -j REDINPUT
 171         /sbin/iptables -N REDFORWARD
 172         /sbin/iptables -A FORWARD -j REDFORWARD
 173         /sbin/iptables -t nat -N REDNAT
 174         /sbin/iptables -t nat -A POSTROUTING -j REDNAT
 175
 176         iptables_red
 177
 178         # Custom prerouting chains (for transparent proxy and port forwarding)
 179         /sbin/iptables -t nat -N SQUID
 180         /sbin/iptables -t nat -A PREROUTING -j SQUID
 181         /sbin/iptables -t nat -N NAT_DESTINATION
 182         /sbin/iptables -t nat -N NAT_SOURCE
 183         /sbin/iptables -t nat -A PREROUTING -j NAT_DESTINATION
 184         /sbin/iptables -t nat -I POSTROUTING 3 -j NAT_SOURCE
 185
 186
 187
 188         # upnp chain for our upnp daemon
 189         /sbin/iptables -t nat -N UPNPFW
 190         /sbin/iptables -t nat -A PREROUTING -j UPNPFW
 191         /sbin/iptables -N UPNPFW
 192         /sbin/iptables -A FORWARD -m state --state NEW -j UPNPFW
 193
 194         # Postrouting rules (for port forwarding)
 195         /sbin/iptables -t nat -A POSTROUTING -m mark --mark 1 -j SNAT --to-source $GREEN_ADDRESS
 196         if [ "$BLUE_DEV" != "" ]; then
 197                 /sbin/iptables -t nat -A POSTROUTING -m mark --mark 2 -j SNAT --to-source $BLUE_ADDRESS
 198         fi
 199         if [ "$ORANGE_DEV" != "" ]; then
 200                 /sbin/iptables -t nat -A POSTROUTING -m mark --mark 3 -j SNAT --to-source $ORANGE_ADDRESS
 201         fi
 202
 203         # run local firewall configuration, if present
 204         if [ -x /etc/sysconfig/firewall.local ]; then
 205                 /etc/sysconfig/firewall.local start
 206         fi
 207
 208         # run openvpn
 209         /usr/local/bin/openvpnctrl --create-chains-and-rules
 210
 211         # run wirelessctrl
 212         /usr/local/bin/wirelessctrl
 213
 214         #POLICY CHAIN
 215         /sbin/iptables -N POLICYIN
 216         /sbin/iptables -A INPUT -j POLICYIN
 217         /sbin/iptables -N POLICYFWD
 218         /sbin/iptables -A FORWARD -j POLICYFWD
 219         /sbin/iptables -N POLICYOUT
 220         /sbin/iptables -A OUTPUT -j POLICYOUT
 221
 222         /usr/sbin/firewall-policy
 223
 224         # read new firewall
 225         /usr/local/bin/forwardfwctrl
 226
 227         if [ "$DROPINPUT" == "on" ]; then
 228                 /sbin/iptables -A INPUT   -m limit --limit 10/minute -j LOG --log-prefix "DROP_INPUT"
 229         fi
 230         /sbin/iptables -A INPUT -j DROP -m comment --comment "DROP_INPUT"
 231         if [ "$DROPFORWARD" == "on" ]; then
 232                 /sbin/iptables -A FORWARD -m limit --limit 10/minute -j LOG --log-prefix "DROP_FORWARD"
 233         fi
 234         /sbin/iptables -A FORWARD -j DROP -m comment --comment "DROP_FORWARD"
 235 }
 236
 237 iptables_red() {
 238         /sbin/iptables -F REDINPUT
 239         /sbin/iptables -F REDFORWARD
 240         /sbin/iptables -t nat -F REDNAT
 241
 242         # PPPoE / PPTP Device
 243         if [ "$IFACE" != "" ]; then
 244                 # PPPoE / PPTP
 245                 if [ "$DEVICE" != "" ]; then
 246                         /sbin/iptables -A REDINPUT -i $DEVICE -j ACCEPT
 247                 fi
 248                 if [ "$RED_TYPE" == "PPTP" -o "$RED_TYPE" == "PPPOE" ]; then
 249                         if [ "$RED_DEV" != "" ]; then
 250                                 /sbin/iptables -A REDINPUT -i $RED_DEV -j ACCEPT
 251                         fi
 252                 fi
 253         fi
 254
 255         # PPTP over DHCP
 256         if [ "$DEVICE" != "" -a "$TYPE" == "PPTP" -a "$METHOD" == "DHCP" ]; then
 257                 /sbin/iptables -A REDINPUT -p tcp --source-port 67 --destination-port 68 -i $DEVICE -j ACCEPT
 258                 /sbin/iptables -A REDINPUT -p udp --source-port 67 --destination-port 68 -i $DEVICE -j ACCEPT
 259         fi
 260
 261         # Orange pinholes
 262         if [ "$ORANGE_DEV" != "" ]; then
 263                 # This rule enables a host on ORANGE network to connect to the outside
 264                 # (only if we have a red connection)
 265                 if [ "$IFACE" != "" ]; then
 266                         /sbin/iptables -A REDFORWARD -i $ORANGE_DEV -o $IFACE -j ACCEPT
 267                 fi
 268         fi
 269
 270         if [ "$IFACE" != "" -a -f /var/ipfire/red/active ]; then
 271                 # DHCP
 272                 if [ "$RED_DEV" != "" -a "$RED_TYPE" == "DHCP" ]; then
 273                         /sbin/iptables -A REDINPUT -p tcp --source-port 67 --destination-port 68 -i $IFACE -j ACCEPT
 274                         /sbin/iptables -A REDINPUT -p udp --source-port 67 --destination-port 68 -i $IFACE -j ACCEPT
 275                 fi
 276                 if [ "$METHOD" == "DHCP"  -a "$PROTOCOL" == "RFC1483" ]; then
 277                         /sbin/iptables -A REDINPUT -p tcp --source-port 67 --destination-port 68 -i $IFACE -j ACCEPT
 278                         /sbin/iptables -A REDINPUT -p udp --source-port 67 --destination-port 68 -i $IFACE -j ACCEPT
 279                 fi
 280
 281                 # Outgoing masquerading (don't masqerade IPSEC (mark 50))
 282                 /sbin/iptables -t nat -A REDNAT -m mark --mark 50 -o $IFACE -j RETURN
 283                 /sbin/iptables -t nat -A REDNAT -o $IFACE -j MASQUERADE
 284
 285         fi
 286 }
 287
 288 # See how we were called.
 289 case "$1" in
 290   start)
 291         iptables_init
 292         ;;
 293   reload)
 294         iptables_red
 295         # run local firewall configuration, if present
 296         if [ -x /etc/sysconfig/firewall.local ]; then
 297                 /etc/sysconfig/firewall.local reload
 298         fi
 299         ;;
 300   restart)
 301         # run local firewall configuration, if present
 302         if [ -x /etc/sysconfig/firewall.local ]; then
 303                 /etc/sysconfig/firewall.local stop
 304         fi
 305         $0 start
 306         ;;
 307   *)
 308         echo "Usage: $0 {start|reload|restart}"
 309         exit 1
 310         ;;
 311 esac
 312
 313 exit 0