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 -N OVPNBLOCK
 149         /sbin/iptables -A FORWARD -j OVPNBLOCK
 150         /sbin/iptables -A FORWARD -j GUARDIAN
 151         /sbin/iptables -N CUSTOMFORWARD
 152         /sbin/iptables -A FORWARD -j CUSTOMFORWARD
 153         /sbin/iptables -N CUSTOMOUTPUT
 154         /sbin/iptables -A OUTPUT -j OVPNBLOCK
 155         /sbin/iptables -A OUTPUT -m state --state ESTABLISHED,RELATED -j ACCEPT
 156         /sbin/iptables -A OUTPUT -j CUSTOMOUTPUT
 157         /sbin/iptables -N OUTGOINGFW
 158         /sbin/iptables -A OUTPUT -j OUTGOINGFW
 159         /sbin/iptables -t nat -N CUSTOMPREROUTING
 160         /sbin/iptables -t nat -N OVPNNAT
 161         /sbin/iptables -t nat -A PREROUTING -j CUSTOMPREROUTING
 162         /sbin/iptables -t nat -N CUSTOMPOSTROUTING
 163         /sbin/iptables -t nat -A POSTROUTING -j CUSTOMPOSTROUTING
 164         /sbin/iptables -t nat -A POSTROUTING -j OVPNNAT
 165
 166         # IPTV chains for IGMPPROXY
 167         /sbin/iptables -N IPTVINPUT
 168         /sbin/iptables -A INPUT -j IPTVINPUT
 169         /sbin/iptables -N IPTVFORWARD
 170         /sbin/iptables -A FORWARD -j IPTVFORWARD
 171
 172         # Filtering ovpn networks INPUT
 173         /sbin/iptables -A INPUT -j OVPNBLOCK
 174
 175         # filtering from GUI
 176         /sbin/iptables -N GUIINPUT
 177         /sbin/iptables -A INPUT -j GUIINPUT
 178         /sbin/iptables -A GUIINPUT -p icmp --icmp-type 8 -j ACCEPT
 179
 180         # Accept everything connected
 181         /sbin/iptables -A INPUT   -m state --state ESTABLISHED,RELATED -j ACCEPT
 182         /sbin/iptables -A FORWARD -m state --state ESTABLISHED,RELATED -j ACCEPT
 183
 184         # Accept everything on lo
 185         iptables -A INPUT  -i lo -m state --state NEW -j ACCEPT
 186         iptables -A OUTPUT -o lo -m state --state NEW -j ACCEPT
 187
 188         # trafic from ipsecX/TUN/TAP interfaces, before "-i GREEN_DEV" accept everything
 189         /sbin/iptables -N IPSECINPUT
 190         /sbin/iptables -N IPSECFORWARD
 191         /sbin/iptables -N IPSECOUTPUT
 192         /sbin/iptables -N OPENSSLVIRTUAL
 193         /sbin/iptables -A INPUT -j IPSECINPUT
 194         /sbin/iptables -A INPUT -j OPENSSLVIRTUAL -m comment --comment "OPENSSLVIRTUAL INPUT"
 195         /sbin/iptables -A FORWARD -j IPSECFORWARD
 196         /sbin/iptables -A FORWARD -j OPENSSLVIRTUAL -m comment --comment "OPENSSLVIRTUAL FORWARD"
 197         /sbin/iptables -A OUTPUT -j IPSECOUTPUT
 198         /sbin/iptables -t nat -N IPSECNAT
 199         /sbin/iptables -t nat -A POSTROUTING -j IPSECNAT
 200
 201         # Input Firewall
 202         /sbin/iptables -N INPUTFW
 203         /sbin/iptables -A INPUT -m state --state NEW -j INPUTFW
 204
 205         # localhost and ethernet.
 206         /sbin/iptables -A INPUT   -i lo -m state --state NEW -j ACCEPT
 207         /sbin/iptables -A INPUT   -s 127.0.0.0/8 -m state --state NEW -j DROP   # Loopback not on lo
 208         /sbin/iptables -A INPUT   -d 127.0.0.0/8 -m state --state NEW -j DROP
 209         /sbin/iptables -A FORWARD -i lo -m state --state NEW -j ACCEPT
 210         /sbin/iptables -A FORWARD -s 127.0.0.0/8 -m state --state NEW -j DROP
 211         /sbin/iptables -A FORWARD -d 127.0.0.0/8 -m state --state NEW -j DROP
 212         /sbin/iptables -A INPUT   -i $GREEN_DEV  -m state --state NEW -j ACCEPT ! -p icmp
 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 FORWARD -m state --state NEW -j WIRELESSFORWARD
 223
 224         # Forward Firewall
 225         /sbin/iptables -N FORWARDFW
 226         /sbin/iptables -A FORWARD -j FORWARDFW
 227
 228         # PORTFWACCESS chain, used for portforwarding
 229         /sbin/iptables -N PORTFWACCESS
 230         /sbin/iptables -A FORWARD -m state --state NEW -j PORTFWACCESS
 231
 232         # OPenSSL
 233         /sbin/iptables -N OPENSSLPHYSICAL
 234         /sbin/iptables -A INPUT -j OPENSSLPHYSICAL
 235
 236         # RED chain, used for the red interface
 237         /sbin/iptables -N REDINPUT
 238         /sbin/iptables -A INPUT -j REDINPUT
 239         /sbin/iptables -N REDFORWARD
 240         /sbin/iptables -A FORWARD -j REDFORWARD
 241         /sbin/iptables -t nat -N REDNAT
 242         /sbin/iptables -t nat -A POSTROUTING -j REDNAT
 243
 244         iptables_red
 245
 246         # Custom prerouting chains (for transparent proxy and port forwarding)
 247         /sbin/iptables -t nat -N SQUID
 248         /sbin/iptables -t nat -A PREROUTING -j SQUID
 249         /sbin/iptables -t nat -N NAT_DESTINATION
 250         /sbin/iptables -t nat -N NAT_SOURCE
 251         /sbin/iptables -t nat -A PREROUTING -j NAT_DESTINATION
 252         /sbin/iptables -t nat -I POSTROUTING 3 -j NAT_SOURCE
 253
 254
 255
 256         # upnp chain for our upnp daemon
 257         /sbin/iptables -t nat -N UPNPFW
 258         /sbin/iptables -t nat -A PREROUTING -j UPNPFW
 259         /sbin/iptables -N UPNPFW
 260         /sbin/iptables -A FORWARD -m state --state NEW -j UPNPFW
 261
 262         # Postrouting rules (for port forwarding)
 263         /sbin/iptables -t nat -A POSTROUTING -m mark --mark 1 -j SNAT --to-source $GREEN_ADDRESS
 264         if [ "$BLUE_DEV" != "" ]; then
 265                 /sbin/iptables -t nat -A POSTROUTING -m mark --mark 2 -j SNAT --to-source $BLUE_ADDRESS
 266         fi
 267         if [ "$ORANGE_DEV" != "" ]; then
 268                 /sbin/iptables -t nat -A POSTROUTING -m mark --mark 3 -j SNAT --to-source $ORANGE_ADDRESS
 269         fi
 270
 271         # run local firewall configuration, if present
 272         if [ -x /etc/sysconfig/firewall.local ]; then
 273                 /etc/sysconfig/firewall.local start
 274         fi
 275
 276         #POLICY CHAIN
 277         /sbin/iptables -N POLICYIN
 278         /sbin/iptables -A INPUT -j POLICYIN
 279         /sbin/iptables -N POLICYFWD
 280         /sbin/iptables -A FORWARD -j POLICYFWD
 281         /sbin/iptables -N POLICYOUT
 282         /sbin/iptables -A OUTPUT -j POLICYOUT
 283
 284         /usr/sbin/firewall-policy
 285
 286         if [ "$DROPINPUT" == "on" ]; then
 287                 /sbin/iptables -A INPUT   -m limit --limit 10/minute -j LOG --log-prefix "DROP_INPUT"
 288         fi
 289         /sbin/iptables -A INPUT -j DROP -m comment --comment "DROP_INPUT"
 290         if [ "$DROPFORWARD" == "on" ]; then
 291                 /sbin/iptables -A FORWARD -m limit --limit 10/minute -j LOG --log-prefix "DROP_FORWARD"
 292         fi
 293         /sbin/iptables -A FORWARD -j DROP -m comment --comment "DROP_FORWARD"
 294         ;;
 295   startovpn)
 296         # run openvpn
 297         /usr/local/bin/openvpnctrl --create-chains-and-rules
 298         ;;
 299   stop)
 300         iptables_init
 301         # Accept everyting connected
 302         /sbin/iptables -A INPUT   -m state --state ESTABLISHED,RELATED -j ACCEPT
 303
 304         # localhost and ethernet.
 305         /sbin/iptables -A INPUT -i lo -j ACCEPT
 306         /sbin/iptables -A INPUT -i $GREEN_DEV -m state --state NEW -j ACCEPT
 307
 308         if [ "$RED_DEV" != "" -a "$RED_TYPE" == "DHCP" ]; then
 309                 /sbin/iptables -A INPUT -p tcp --source-port 67 --destination-port 68 -i $IFACE -j ACCEPT
 310                 /sbin/iptables -A INPUT -p udp --source-port 67 --destination-port 68 -i $IFACE -j ACCEPT
 311         fi
 312         if [ "$PROTOCOL" == "RFC1483" -a "$METHOD" == "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 $IFACE -j ACCEPT
 315         fi
 316
 317         # run local firewall configuration, if present
 318         if [ -x /etc/sysconfig/firewall.local ]; then
 319                 /etc/sysconfig/firewall.local stop
 320         fi
 321
 322         /sbin/iptables -A INPUT -j DROP -m comment --comment "DROP_INPUT"
 323
 324         if [ "$DROPINPUT" == "on" ]; then
 325                 /sbin/iptables -A INPUT   -m limit --limit 10/minute -j LOG --log-prefix "DROP_INPUT"
 326         fi
 327         if [ "$DROPFORWARD" == "on" ]; then
 328                 /sbin/iptables -A FORWARD -m limit --limit 10/minute -j LOG --log-prefix "DROP_FORWARD"
 329         fi
 330         /sbin/iptables -A FORWARD -j DROP -m comment --comment "DROP_FORWARD"
 331
 332         ;;
 333   stopovpn)
 334         # stop openvpn
 335         /usr/local/bin/openvpnctrl --delete-chains-and-rules
 336         ;;
 337   reload)
 338         iptables_red
 339
 340         # run local firewall configuration, if present
 341         if [ -x /etc/sysconfig/firewall.local ]; then
 342                 /etc/sysconfig/firewall.local reload
 343         fi
 344         ;;
 345   restart)
 346         $0 stop
 347         $0 start
 348         /usr/local/bin/forwardfwctrl
 349         /usr/local/bin/openvpnctrl -s > /dev/null 2>&1
 350         /usr/local/bin/openvpnctrl -sn2n > /dev/null 2>&1
 351         ;;
 352   *)
 353         echo "Usage: $0 {start|stop|reload|restart}"
 354         exit 1
 355         ;;
 356 esac
 357
 358 exit 0