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 [ "$DROPNEWNOTSYN" == "on" ]; then
  49                 /sbin/iptables -A NEWNOTSYN  -m limit --limit 10/minute -j LOG  --log-prefix "DROP_NEWNOTSYN "
  50         fi
  51         /sbin/iptables -A NEWNOTSYN  -j DROP -m comment --comment "DROP_NEWNOTSYN"
  52
  53         # Chain to contain all the rules relating to bad TCP flags
  54         /sbin/iptables -N BADTCP
  55
  56         #Don't check loopback
  57         /sbin/iptables -A BADTCP -i lo -j RETURN
  58
  59         # Disallow packets frequently used by port-scanners
  60         # nmap xmas
  61         /sbin/iptables -A BADTCP -p tcp --tcp-flags ALL FIN,URG,PSH  -j PSCAN
  62         # Null
  63         /sbin/iptables -A BADTCP -p tcp --tcp-flags ALL NONE -j PSCAN
  64         # FIN
  65         /sbin/iptables -A BADTCP -p tcp --tcp-flags ALL FIN -j PSCAN
  66         # SYN/RST (also catches xmas variants that set SYN+RST+...)
  67         /sbin/iptables -A BADTCP -p tcp --tcp-flags SYN,RST SYN,RST -j PSCAN
  68         # SYN/FIN (QueSO or nmap OS probe)
  69         /sbin/iptables -A BADTCP -p tcp --tcp-flags SYN,FIN SYN,FIN -j PSCAN
  70         # NEW TCP without SYN
  71         /sbin/iptables -A BADTCP -p tcp ! --syn -m state --state NEW -j NEWNOTSYN
  72
  73         /sbin/iptables -A INPUT   -j BADTCP
  74         /sbin/iptables -A FORWARD -j BADTCP
  75
  76 }
  77
  78 iptables_red() {
  79         /sbin/iptables -F REDINPUT
  80         /sbin/iptables -F REDFORWARD
  81         /sbin/iptables -t nat -F REDNAT
  82
  83         # PPPoE / PPTP Device
  84         if [ "$IFACE" != "" ]; then
  85                 # PPPoE / PPTP
  86                 if [ "$DEVICE" != "" ]; then
  87                         /sbin/iptables -A REDINPUT -i $DEVICE -j ACCEPT
  88                 fi
  89                 if [ "$RED_TYPE" == "PPTP" -o "$RED_TYPE" == "PPPOE" ]; then
  90                         if [ "$RED_DEV" != "" ]; then
  91                                 /sbin/iptables -A REDINPUT -i $RED_DEV -j ACCEPT
  92                         fi
  93                 fi
  94         fi
  95
  96         # PPTP over DHCP
  97         if [ "$DEVICE" != "" -a "$TYPE" == "PPTP" -a "$METHOD" == "DHCP" ]; then
  98                 /sbin/iptables -A REDINPUT -p tcp --source-port 67 --destination-port 68 -i $DEVICE -j ACCEPT
  99                 /sbin/iptables -A REDINPUT -p udp --source-port 67 --destination-port 68 -i $DEVICE -j ACCEPT
 100         fi
 101
 102         # Orange pinholes
 103         if [ "$ORANGE_DEV" != "" ]; then
 104                 # This rule enables a host on ORANGE network to connect to the outside
 105                 # (only if we have a red connection)
 106                 if [ "$IFACE" != "" ]; then
 107                         /sbin/iptables -A REDFORWARD -i $ORANGE_DEV -o $IFACE -j ACCEPT
 108                 fi
 109         fi
 110
 111         if [ "$IFACE" != "" -a -f /var/ipfire/red/active ]; then
 112                 # DHCP
 113                 if [ "$RED_DEV" != "" -a "$RED_TYPE" == "DHCP" ]; then
 114                         /sbin/iptables -A REDINPUT -p tcp --source-port 67 --destination-port 68 -i $IFACE -j ACCEPT
 115                         /sbin/iptables -A REDINPUT -p udp --source-port 67 --destination-port 68 -i $IFACE -j ACCEPT
 116                 fi
 117                 if [ "$METHOD" == "DHCP"  -a "$PROTOCOL" == "RFC1483" ]; then
 118                         /sbin/iptables -A REDINPUT -p tcp --source-port 67 --destination-port 68 -i $IFACE -j ACCEPT
 119                         /sbin/iptables -A REDINPUT -p udp --source-port 67 --destination-port 68 -i $IFACE -j ACCEPT
 120                 fi
 121
 122                 # Outgoing masquerading (don't masqerade IPSEC (mark 50))
 123                 /sbin/iptables -t nat -A REDNAT -m mark --mark 50 -o $IFACE -j RETURN
 124                 /sbin/iptables -t nat -A REDNAT -o $IFACE -j MASQUERADE
 125
 126         fi
 127 }
 128
 129 # See how we were called.
 130 case "$1" in
 131   start)
 132         iptables_init
 133
 134         # Limit Packets- helps reduce dos/syn attacks
 135         # original do nothing line
 136         #/sbin/iptables -A INPUT -p tcp -m tcp --tcp-flags SYN,RST,ACK SYN -m limit --limit 10/sec
 137         # the correct one, but the negative '!' do nothing...
 138         #/sbin/iptables -A INPUT -p tcp -m tcp --tcp-flags SYN,RST,ACK SYN ! -m limit --limit 10/sec -j DROP
 139
 140         # Fix for braindead ISP's
 141         /sbin/iptables -A FORWARD -p tcp --tcp-flags SYN,RST SYN -j TCPMSS --clamp-mss-to-pmtu
 142
 143         # CUSTOM chains, can be used by the users themselves
 144         /sbin/iptables -N CUSTOMINPUT
 145         /sbin/iptables -A INPUT -j CUSTOMINPUT
 146         /sbin/iptables -N GUARDIAN
 147         /sbin/iptables -A INPUT -j GUARDIAN
 148         /sbin/iptables -A FORWARD -j GUARDIAN
 149         /sbin/iptables -N CUSTOMFORWARD
 150         /sbin/iptables -A FORWARD -j CUSTOMFORWARD
 151         /sbin/iptables -N CUSTOMOUTPUT
 152         /sbin/iptables -A OUTPUT -j CUSTOMOUTPUT
 153         /sbin/iptables -N OUTGOINGFW
 154         /sbin/iptables -A OUTPUT -j OUTGOINGFW
 155         /sbin/iptables -A OUTGOINGFW -m state --state ESTABLISHED,RELATED -j ACCEPT
 156         /sbin/iptables -t nat -N CUSTOMPREROUTING
 157         /sbin/iptables -t nat -A PREROUTING -j CUSTOMPREROUTING
 158         /sbin/iptables -t nat -N CUSTOMPOSTROUTING
 159         /sbin/iptables -t nat -A POSTROUTING -j CUSTOMPOSTROUTING
 160
 161         # IPTV chains for IGMPPROXY
 162         /sbin/iptables -N IPTVINPUT
 163         /sbin/iptables -A INPUT -j IPTVINPUT
 164         /sbin/iptables -N IPTVFORWARD
 165         /sbin/iptables -A FORWARD -j IPTVFORWARD
 166
 167         # filtering from GUI
 168         /sbin/iptables -N GUIINPUT
 169         /sbin/iptables -A INPUT -j GUIINPUT
 170         /sbin/iptables -A GUIINPUT -p icmp --icmp-type 8 -j ACCEPT
 171
 172         # Accept everything connected
 173         /sbin/iptables -A INPUT   -m state --state ESTABLISHED,RELATED -j ACCEPT
 174         /sbin/iptables -A FORWARD -m state --state ESTABLISHED,RELATED -j ACCEPT
 175
 176         # trafic from ipsecX/TUN/TAP interfaces, before "-i GREEN_DEV" accept everything
 177         /sbin/iptables -N IPSECINPUT
 178         /sbin/iptables -N IPSECFORWARD
 179         /sbin/iptables -N IPSECOUTPUT
 180         /sbin/iptables -N OPENSSLVIRTUAL
 181         /sbin/iptables -A INPUT -j IPSECINPUT
 182         /sbin/iptables -A INPUT -j OPENSSLVIRTUAL -m comment --comment "OPENSSLVIRTUAL INPUT"
 183         /sbin/iptables -A FORWARD -j IPSECFORWARD
 184         /sbin/iptables -A FORWARD -j OPENSSLVIRTUAL -m comment --comment "OPENSSLVIRTUAL FORWARD"
 185         /sbin/iptables -A OUTPUT -j IPSECOUTPUT
 186         /sbin/iptables -t nat -N OVPNNAT
 187         /sbin/iptables -t nat -N IPSECNAT
 188         /sbin/iptables -t nat -A POSTROUTING -j OVPNNAT
 189         /sbin/iptables -t nat -A POSTROUTING -j IPSECNAT
 190
 191         # Forward Firewall
 192         /sbin/iptables -N FORWARDFW
 193         /sbin/iptables -A FORWARD -j FORWARDFW
 194
 195         # Input Firewall
 196         /sbin/iptables -N INPUTFW
 197         /sbin/iptables -A INPUT -m state --state NEW -j INPUTFW
 198
 199         # localhost and ethernet.
 200         /sbin/iptables -A INPUT   -i lo -m state --state NEW -j ACCEPT
 201         /sbin/iptables -A INPUT   -s 127.0.0.0/8 -m state --state NEW -j DROP   # Loopback not on lo
 202         /sbin/iptables -A INPUT   -d 127.0.0.0/8 -m state --state NEW -j DROP
 203         /sbin/iptables -A FORWARD -i lo -m state --state NEW -j ACCEPT
 204         /sbin/iptables -A FORWARD -s 127.0.0.0/8 -m state --state NEW -j DROP
 205         /sbin/iptables -A FORWARD -d 127.0.0.0/8 -m state --state NEW -j DROP
 206         /sbin/iptables -A INPUT   -i $GREEN_DEV  -m state --state NEW -j ACCEPT ! -p icmp
 207         #/sbin/iptables -A FORWARD -i $GREEN_DEV  -m state --state NEW -j ACCEPT
 208
 209         # If a host on orange tries to initiate a connection to IPFire's red IP and
 210         # the connection gets DNATed back through a port forward to a server on orange
 211         # we end up with orange -> orange traffic passing through IPFire
 212         [ "$ORANGE_DEV" != "" ] && /sbin/iptables -A FORWARD -i $ORANGE_DEV -o $ORANGE_DEV -m state --state NEW -j ACCEPT
 213
 214         # allow DHCP on BLUE to be turned on/off
 215         /sbin/iptables -N DHCPBLUEINPUT
 216         /sbin/iptables -A INPUT -j DHCPBLUEINPUT
 217
 218         # WIRELESS chains
 219         /sbin/iptables -N WIRELESSINPUT
 220         /sbin/iptables -A INPUT -m state --state NEW -j WIRELESSINPUT
 221         /sbin/iptables -N WIRELESSFORWARD
 222         /sbin/iptables -A FORWARDFW -m state --state NEW -j WIRELESSFORWARD
 223
 224         # PORTFWACCESS chain, used for portforwarding
 225         /sbin/iptables -N PORTFWACCESS
 226         /sbin/iptables -A FORWARD -m state --state NEW -j PORTFWACCESS
 227
 228         # OPenSSL
 229         /sbin/iptables -N OPENSSLPHYSICAL
 230         /sbin/iptables -A INPUT -j OPENSSLPHYSICAL
 231
 232         # RED chain, used for the red interface
 233         /sbin/iptables -N REDINPUT
 234         /sbin/iptables -A INPUT -j REDINPUT
 235         /sbin/iptables -N REDFORWARD
 236         /sbin/iptables -A FORWARD -j REDFORWARD
 237         /sbin/iptables -t nat -N REDNAT
 238         /sbin/iptables -t nat -A POSTROUTING -j REDNAT
 239
 240         iptables_red
 241
 242         # DMZ pinhole chain.
 243         # ORANGE to talk to GREEN / BLUE.
 244         if [ "$ORANGE_DEV" != "" ]; then
 245                 /sbin/iptables -A FORWARD -i $ORANGE_DEV -m state --state NEW -j FORWARDFW
 246         fi
 247
 248         # Custom prerouting chains (for transparent proxy and port forwarding)
 249         /sbin/iptables -t nat -N SQUID
 250         /sbin/iptables -t nat -A PREROUTING -j SQUID
 251         /sbin/iptables -t nat -N PORTFW
 252         /sbin/iptables -t nat -A PREROUTING -j PORTFW
 253
 254         # upnp chain for our upnp daemon
 255         /sbin/iptables -t nat -N UPNPFW
 256         /sbin/iptables -t nat -A PREROUTING -j UPNPFW
 257         /sbin/iptables -N UPNPFW
 258         /sbin/iptables -A FORWARD -m state --state NEW -j UPNPFW
 259
 260         # Custom mangle chain (for port fowarding)
 261         /sbin/iptables -t mangle -N PORTFWMANGLE
 262         /sbin/iptables -t mangle -A PREROUTING -j PORTFWMANGLE
 263
 264         # Postrouting rules (for port forwarding)
 265         /sbin/iptables -t nat -A POSTROUTING -m mark --mark 1 -j SNAT \
 266          --to-source $GREEN_ADDRESS
 267         if [ "$BLUE_DEV" != "" ]; then
 268                 /sbin/iptables -t nat -A POSTROUTING -m mark --mark 2 -j SNAT --to-source $BLUE_ADDRESS
 269         fi
 270         if [ "$ORANGE_DEV" != "" ]; then
 271                 /sbin/iptables -t nat -A POSTROUTING -m mark --mark 3 -j SNAT --to-source $ORANGE_ADDRESS
 272         fi
 273
 274         # run local firewall configuration, if present
 275         if [ -x /etc/sysconfig/firewall.local ]; then
 276                 /etc/sysconfig/firewall.local start
 277         fi
 278
 279         # last rule in input and forward chain is for logging.
 280
 281         if [ "$DROPINPUT" == "on" ]; then
 282                 /sbin/iptables -A INPUT -m limit --limit 10/minute -j LOG --log-prefix "DROP_INPUT "
 283         fi
 284         /sbin/iptables -A INPUT -j DROP -m comment --comment "DROP_INPUT"
 285         #if [ "$DROPFORWARD" == "on" ]; then
 286         #       /sbin/iptables -A FORWARD -m limit --limit 10/minute -j LOG --log-prefix "DROP_FORWARD "
 287         #fi
 288         #/sbin/iptables -A FORWARD -j DROP -m comment --comment "DROP_FORWARD"
 289
 290         #POLICY CHAIN
 291         /sbin/iptables -N POLICYFWD
 292         /sbin/iptables -A FORWARD -j POLICYFWD
 293         /sbin/iptables -N POLICYOUT
 294         /sbin/iptables -A OUTPUT -j POLICYOUT
 295
 296         /usr/sbin/firewall-policy
 297
 298         ;;
 299   startovpn)
 300         # run openvpn
 301         /usr/local/bin/openvpnctrl --create-chains-and-rules
 302         ;;
 303   stop)
 304         iptables_init
 305         # Accept everyting connected
 306         /sbin/iptables -A INPUT   -m state --state ESTABLISHED,RELATED -j ACCEPT
 307
 308         # localhost and ethernet.
 309         /sbin/iptables -A INPUT -i lo -j ACCEPT
 310         /sbin/iptables -A INPUT -i $GREEN_DEV -m state --state NEW -j ACCEPT
 311
 312         if [ "$RED_DEV" != "" -a "$RED_TYPE" == "DHCP" ]; then
 313                 /sbin/iptables -A INPUT -p tcp --source-port 67 --destination-port 68 -i $IFACE -j ACCEPT
 314                 /sbin/iptables -A INPUT -p udp --source-port 67 --destination-port 68 -i $IFACE -j ACCEPT
 315         fi
 316         if [ "$PROTOCOL" == "RFC1483" -a "$METHOD" == "DHCP" ]; then
 317                 /sbin/iptables -A INPUT -p tcp --source-port 67 --destination-port 68 -i $IFACE -j ACCEPT
 318                 /sbin/iptables -A INPUT -p udp --source-port 67 --destination-port 68 -i $IFACE -j ACCEPT
 319         fi
 320
 321         # run local firewall configuration, if present
 322         if [ -x /etc/sysconfig/firewall.local ]; then
 323                 /etc/sysconfig/firewall.local stop
 324         fi
 325
 326         if [ "$DROPINPUT" == "on" ]; then
 327                 /sbin/iptables -A INPUT   -m limit --limit 10/minute -j LOG --log-prefix "DROP_INPUT "
 328         fi
 329         /sbin/iptables -A INPUT -j DROP -m comment --comment "DROP_INPUT"
 330         if [ "$DROPFORWARD" == "on" ]; then
 331                 /sbin/iptables -A FORWARD -m limit --limit 10/minute -j LOG --log-prefix "DROP_FORWARD "
 332         fi
 333         /sbin/iptables -A FORWARD -j DROP -m comment --comment "DROP_FORWARD"
 334         ;;
 335   stopovpn)
 336         # stop openvpn
 337         /usr/local/bin/openvpnctrl --delete-chains-and-rules
 338         ;;
 339   reload)
 340         iptables_red
 341
 342         # run local firewall configuration, if present
 343         if [ -x /etc/sysconfig/firewall.local ]; then
 344                 /etc/sysconfig/firewall.local reload
 345         fi
 346         ;;
 347   restart)
 348         $0 stop
 349         $0 start
 350         /usr/local/bin/forwardfwctrl
 351         /usr/local/bin/setportfw
 352         /usr/local/bin/openvpnctrl -s > /dev/null 2>&1
 353         /usr/local/bin/openvpnctrl -sn2n > /dev/null 2>&1
 354         ;;
 355   *)
 356         echo "Usage: $0 {start|stop|reload|restart}"
 357         exit 1
 358         ;;
 359 esac
 360
 361 exit 0