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 [ "$DROPNEWNOTSYN" == "on" ]; then
  49                 /sbin/iptables -A NEWNOTSYN  -m limit --limit 10/minute -j LOG  --log-prefix "DROP_NEWNOTSYN "
  50         fi
  51         /sbin/iptables -A NEWNOTSYN  -j DROP -m comment --comment "DROP_NEWNOTSYN"
  52
  53         # Chain to contain all the rules relating to bad TCP flags
  54         /sbin/iptables -N BADTCP
  55
  56         #Don't check loopback
  57         /sbin/iptables -A INPUT   -i lo -j RETURN
  58
  59         # Disallow packets frequently used by port-scanners
  60         # nmap xmas
  61         /sbin/iptables -A BADTCP -p tcp --tcp-flags ALL FIN,URG,PSH  -j PSCAN
  62         # Null
  63         /sbin/iptables -A BADTCP -p tcp --tcp-flags ALL NONE -j PSCAN
  64         # FIN
  65         /sbin/iptables -A BADTCP -p tcp --tcp-flags ALL FIN -j PSCAN
  66         # SYN/RST (also catches xmas variants that set SYN+RST+...)
  67         /sbin/iptables -A BADTCP -p tcp --tcp-flags SYN,RST SYN,RST -j PSCAN
  68         # SYN/FIN (QueSO or nmap OS probe)
  69         /sbin/iptables -A BADTCP -p tcp --tcp-flags SYN,FIN SYN,FIN -j PSCAN
  70         # NEW TCP without SYN
  71         /sbin/iptables -A BADTCP -p tcp ! --syn -m state --state NEW -j NEWNOTSYN
  72
  73         /sbin/iptables -A INPUT   -j BADTCP
  74         /sbin/iptables -A FORWARD -j BADTCP
  75
  76 }
  77
  78 iptables_red() {
  79         /sbin/iptables -F REDINPUT
  80         /sbin/iptables -F REDFORWARD
  81         /sbin/iptables -t nat -F REDNAT
  82
  83         # PPPoE / PPTP Device
  84         if [ "$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 -N OUTGOINGFWMAC
 155         /sbin/iptables -A OUTPUT -j OUTGOINGFW
 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 IPSECNAT
 187         /sbin/iptables -t nat -A POSTROUTING -j IPSECNAT
 188
 189         # Outgoing Firewall
 190         /sbin/iptables -A FORWARD -j OUTGOINGFWMAC
 191         /sbin/iptables -A FORWARD -j OUTGOINGFW
 192
 193         # localhost and ethernet.
 194         /sbin/iptables -A INPUT   -i lo -m state --state NEW -j ACCEPT
 195         /sbin/iptables -A INPUT   -s 127.0.0.0/8 -m state --state NEW -j DROP   # Loopback not on lo
 196         /sbin/iptables -A INPUT   -d 127.0.0.0/8 -m state --state NEW -j DROP
 197         /sbin/iptables -A FORWARD -i lo -m state --state NEW -j ACCEPT
 198         /sbin/iptables -A FORWARD -s 127.0.0.0/8 -m state --state NEW -j DROP
 199         /sbin/iptables -A FORWARD -d 127.0.0.0/8 -m state --state NEW -j DROP
 200         /sbin/iptables -A INPUT   -i $GREEN_DEV  -m state --state NEW -j ACCEPT ! -p icmp
 201         /sbin/iptables -A FORWARD -i $GREEN_DEV  -m state --state NEW -j ACCEPT
 202
 203         # If a host on orange tries to initiate a connection to IPFire's red IP and
 204         # the connection gets DNATed back through a port forward to a server on orange
 205         # we end up with orange -> orange traffic passing through IPFire
 206         [ "$ORANGE_DEV" != "" ] && /sbin/iptables -A FORWARD -i $ORANGE_DEV -o $ORANGE_DEV -m state --state NEW -j ACCEPT
 207
 208         # allow DHCP on BLUE to be turned on/off
 209         /sbin/iptables -N DHCPBLUEINPUT
 210         /sbin/iptables -A INPUT -j DHCPBLUEINPUT
 211
 212         # OPenSSL
 213         /sbin/iptables -N OPENSSLPHYSICAL
 214         /sbin/iptables -A INPUT -j OPENSSLPHYSICAL
 215
 216         # WIRELESS chains
 217         /sbin/iptables -N WIRELESSINPUT
 218         /sbin/iptables -A INPUT -m state --state NEW -j WIRELESSINPUT
 219         /sbin/iptables -N WIRELESSFORWARD
 220         /sbin/iptables -A FORWARD -m state --state NEW -j WIRELESSFORWARD
 221
 222         # RED chain, used for the red interface
 223         /sbin/iptables -N REDINPUT
 224         /sbin/iptables -A INPUT -j REDINPUT
 225         /sbin/iptables -N REDFORWARD
 226         /sbin/iptables -A FORWARD -j REDFORWARD
 227         /sbin/iptables -t nat -N REDNAT
 228         /sbin/iptables -t nat -A POSTROUTING -j REDNAT
 229
 230         iptables_red
 231
 232         # DMZ pinhole chain.  setdmzholes setuid prog adds rules here to allow
 233         # ORANGE to talk to GREEN / BLUE.
 234         /sbin/iptables -N DMZHOLES
 235         if [ "$ORANGE_DEV" != "" ]; then
 236                 /sbin/iptables -A FORWARD -i $ORANGE_DEV -m state --state NEW -j DMZHOLES
 237         fi
 238
 239         # XTACCESS chain, used for external access
 240         /sbin/iptables -N XTACCESS
 241         /sbin/iptables -A INPUT -m state --state NEW -j XTACCESS
 242
 243         # PORTFWACCESS chain, used for portforwarding
 244         /sbin/iptables -N PORTFWACCESS
 245         /sbin/iptables -A FORWARD -m state --state NEW -j PORTFWACCESS
 246
 247         # Custom prerouting chains (for transparent proxy and port forwarding)
 248         /sbin/iptables -t nat -N SQUID
 249         /sbin/iptables -t nat -A PREROUTING -j SQUID
 250         /sbin/iptables -t nat -N PORTFW
 251         /sbin/iptables -t nat -A PREROUTING -j PORTFW
 252
 253         # upnp chain for our upnp daemon
 254         /sbin/iptables -t nat -N UPNPFW
 255         /sbin/iptables -t nat -A PREROUTING -j UPNPFW
 256         # This chain only contains dummy rules.
 257         /sbin/iptables -N UPNPFW
 258
 259         # Custom mangle chain (for port fowarding)
 260         /sbin/iptables -t mangle -N PORTFWMANGLE
 261         /sbin/iptables -t mangle -A PREROUTING -j PORTFWMANGLE
 262
 263         # Postrouting rules (for port forwarding)
 264         /sbin/iptables -t nat -A POSTROUTING -m mark --mark 1 -j SNAT \
 265          --to-source $GREEN_ADDRESS
 266         if [ "$BLUE_DEV" != "" ]; then
 267                 /sbin/iptables -t nat -A POSTROUTING -m mark --mark 2 -j SNAT --to-source $BLUE_ADDRESS
 268         fi
 269         if [ "$ORANGE_DEV" != "" ]; then
 270                 /sbin/iptables -t nat -A POSTROUTING -m mark --mark 3 -j SNAT --to-source $ORANGE_ADDRESS
 271         fi
 272
 273         # run local firewall configuration, if present
 274         if [ -x /etc/sysconfig/firewall.local ]; then
 275                 /etc/sysconfig/firewall.local start
 276         fi
 277
 278         # last rule in input and forward chain is for logging.
 279
 280         if [ "$DROPINPUT" == "on" ]; then
 281                 /sbin/iptables -A INPUT -m limit --limit 10/minute -j LOG --log-prefix "DROP_INPUT "
 282         fi
 283         /sbin/iptables -A INPUT -j DROP -m comment --comment "DROP_INPUT"
 284         if [ "$DROPOUTPUT" == "on" ]; then
 285                 /sbin/iptables -A FORWARD -m limit --limit 10/minute -j LOG --log-prefix "DROP_OUTPUT "
 286         fi
 287         /sbin/iptables -A FORWARD -j DROP -m comment --comment "DROP_OUTPUT"
 288         ;;
 289   startovpn)
 290         # run openvpn
 291         /usr/local/bin/openvpnctrl --create-chains-and-rules
 292         ;;
 293   stop)
 294         iptables_init
 295         # Accept everyting connected
 296         /sbin/iptables -A INPUT   -m state --state ESTABLISHED,RELATED -j ACCEPT
 297
 298         # localhost and ethernet.
 299         /sbin/iptables -A INPUT -i lo -j ACCEPT
 300         /sbin/iptables -A INPUT -i $GREEN_DEV -m state --state NEW -j ACCEPT
 301
 302         if [ "$RED_DEV" != "" -a "$RED_TYPE" == "DHCP" ]; then
 303                 /sbin/iptables -A INPUT -p tcp --source-port 67 --destination-port 68 -i $IFACE -j ACCEPT
 304                 /sbin/iptables -A INPUT -p udp --source-port 67 --destination-port 68 -i $IFACE -j ACCEPT
 305         fi
 306         if [ "$PROTOCOL" == "RFC1483" -a "$METHOD" == "DHCP" ]; then
 307                 /sbin/iptables -A INPUT -p tcp --source-port 67 --destination-port 68 -i $IFACE -j ACCEPT
 308                 /sbin/iptables -A INPUT -p udp --source-port 67 --destination-port 68 -i $IFACE -j ACCEPT
 309         fi
 310
 311         # run local firewall configuration, if present
 312         if [ -x /etc/sysconfig/firewall.local ]; then
 313                 /etc/sysconfig/firewall.local stop
 314         fi
 315
 316         if [ "$DROPINPUT" == "on" ]; then
 317                 /sbin/iptables -A INPUT   -m limit --limit 10/minute -j LOG --log-prefix "DROP_INPUT "
 318         fi
 319         /sbin/iptables -A INPUT -j DROP -m comment --comment "DROP_INPUT"
 320         if [ "$DROPOUTPUT" == "on" ]; then
 321                 /sbin/iptables -A FORWARD -m limit --limit 10/minute -j LOG --log-prefix "DROP_OUTPUT "
 322         fi
 323         /sbin/iptables -A FORWARD -j DROP -m comment --comment "DROP_OUTPUT"
 324         ;;
 325   stopovpn)
 326         # stop openvpn
 327         /usr/local/bin/openvpnctrl --delete-chains-and-rules
 328         ;;
 329   reload)
 330         iptables_red
 331
 332         # run local firewall configuration, if present
 333         if [ -x /etc/sysconfig/firewall.local ]; then
 334                 /etc/sysconfig/firewall.local reload
 335         fi
 336         ;;
 337   restart)
 338         $0 stop
 339         $0 start
 340         ;;
 341   *)
 342         echo "Usage: $0 {start|stop|reload|restart}"
 343         exit 1
 344         ;;
 345 esac
 346
 347 exit 0