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 -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 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         # TOR
 192         /sbin/iptables -N TOR_INPUT
 193         /sbin/iptables -A INPUT -j TOR_INPUT
 194
 195         # Outgoing Firewall
 196         /sbin/iptables -A FORWARD -j OUTGOINGFWMAC
 197
 198         # localhost and ethernet.
 199         /sbin/iptables -A INPUT   -i lo -m state --state NEW -j ACCEPT
 200         /sbin/iptables -A INPUT   -s 127.0.0.0/8 -m state --state NEW -j DROP   # Loopback not on lo
 201         /sbin/iptables -A INPUT   -d 127.0.0.0/8 -m state --state NEW -j DROP
 202         /sbin/iptables -A FORWARD -i lo -m state --state NEW -j ACCEPT
 203         /sbin/iptables -A FORWARD -s 127.0.0.0/8 -m state --state NEW -j DROP
 204         /sbin/iptables -A FORWARD -d 127.0.0.0/8 -m state --state NEW -j DROP
 205         /sbin/iptables -A INPUT   -i $GREEN_DEV  -m state --state NEW -j ACCEPT ! -p icmp
 206         /sbin/iptables -A FORWARD -i $GREEN_DEV  -m state --state NEW -j ACCEPT
 207
 208         # If a host on orange tries to initiate a connection to IPFire's red IP and
 209         # the connection gets DNATed back through a port forward to a server on orange
 210         # we end up with orange -> orange traffic passing through IPFire
 211         [ "$ORANGE_DEV" != "" ] && /sbin/iptables -A FORWARD -i $ORANGE_DEV -o $ORANGE_DEV -m state --state NEW -j ACCEPT
 212
 213         # allow DHCP on BLUE to be turned on/off
 214         /sbin/iptables -N DHCPBLUEINPUT
 215         /sbin/iptables -A INPUT -j DHCPBLUEINPUT
 216
 217         # OPenSSL
 218         /sbin/iptables -N OPENSSLPHYSICAL
 219         /sbin/iptables -A INPUT -j OPENSSLPHYSICAL
 220
 221         # WIRELESS chains
 222         /sbin/iptables -N WIRELESSINPUT
 223         /sbin/iptables -A INPUT -m state --state NEW -j WIRELESSINPUT
 224         /sbin/iptables -N WIRELESSFORWARD
 225         /sbin/iptables -A FORWARD -m state --state NEW -j WIRELESSFORWARD
 226
 227         # RED chain, used for the red interface
 228         /sbin/iptables -N REDINPUT
 229         /sbin/iptables -A INPUT -j REDINPUT
 230         /sbin/iptables -N REDFORWARD
 231         /sbin/iptables -A FORWARD -j REDFORWARD
 232         /sbin/iptables -t nat -N REDNAT
 233         /sbin/iptables -t nat -A POSTROUTING -j REDNAT
 234
 235         iptables_red
 236
 237         # DMZ pinhole chain.  setdmzholes setuid prog adds rules here to allow
 238         # ORANGE to talk to GREEN / BLUE.
 239         /sbin/iptables -N DMZHOLES
 240         if [ "$ORANGE_DEV" != "" ]; then
 241                 /sbin/iptables -A FORWARD -i $ORANGE_DEV -m state --state NEW -j DMZHOLES
 242         fi
 243
 244         # XTACCESS chain, used for external access
 245         /sbin/iptables -N XTACCESS
 246         /sbin/iptables -A INPUT -m state --state NEW -j XTACCESS
 247
 248         # PORTFWACCESS chain, used for portforwarding
 249         /sbin/iptables -N PORTFWACCESS
 250         /sbin/iptables -A FORWARD -m state --state NEW -j PORTFWACCESS
 251
 252         # Custom prerouting chains (for transparent proxy and port forwarding)
 253         /sbin/iptables -t nat -N SQUID
 254         /sbin/iptables -t nat -A PREROUTING -j SQUID
 255         /sbin/iptables -t nat -N PORTFW
 256         /sbin/iptables -t nat -A PREROUTING -j PORTFW
 257
 258         # upnp chain for our upnp daemon
 259         /sbin/iptables -t nat -N UPNPFW
 260         /sbin/iptables -t nat -A PREROUTING -j UPNPFW
 261         /sbin/iptables -N UPNPFW
 262         /sbin/iptables -A FORWARD -m state --state NEW -j UPNPFW
 263
 264         # Custom mangle chain (for port fowarding)
 265         /sbin/iptables -t mangle -N PORTFWMANGLE
 266         /sbin/iptables -t mangle -A PREROUTING -j PORTFWMANGLE
 267
 268         # Postrouting rules (for port forwarding)
 269         /sbin/iptables -t nat -A POSTROUTING -m mark --mark 1 -j SNAT \
 270          --to-source $GREEN_ADDRESS
 271         if [ "$BLUE_DEV" != "" ]; then
 272                 /sbin/iptables -t nat -A POSTROUTING -m mark --mark 2 -j SNAT --to-source $BLUE_ADDRESS
 273         fi
 274         if [ "$ORANGE_DEV" != "" ]; then
 275                 /sbin/iptables -t nat -A POSTROUTING -m mark --mark 3 -j SNAT --to-source $ORANGE_ADDRESS
 276         fi
 277
 278         # run local firewall configuration, if present
 279         if [ -x /etc/sysconfig/firewall.local ]; then
 280                 /etc/sysconfig/firewall.local start
 281         fi
 282
 283         # last rule in input and forward chain is for logging.
 284
 285         if [ "$DROPINPUT" == "on" ]; then
 286                 /sbin/iptables -A INPUT -m limit --limit 10/minute -j LOG --log-prefix "DROP_INPUT "
 287         fi
 288         /sbin/iptables -A INPUT -j DROP -m comment --comment "DROP_INPUT"
 289         if [ "$DROPOUTPUT" == "on" ]; then
 290                 /sbin/iptables -A FORWARD -m limit --limit 10/minute -j LOG --log-prefix "DROP_OUTPUT "
 291         fi
 292         /sbin/iptables -A FORWARD -j DROP -m comment --comment "DROP_OUTPUT"
 293         ;;
 294   startovpn)
 295         # run openvpn
 296         /usr/local/bin/openvpnctrl --create-chains-and-rules
 297         ;;
 298   stop)
 299         iptables_init
 300         # Accept everyting connected
 301         /sbin/iptables -A INPUT   -m state --state ESTABLISHED,RELATED -j ACCEPT
 302
 303         # localhost and ethernet.
 304         /sbin/iptables -A INPUT -i lo -j ACCEPT
 305         /sbin/iptables -A INPUT -i $GREEN_DEV -m state --state NEW -j ACCEPT
 306
 307         if [ "$RED_DEV" != "" -a "$RED_TYPE" == "DHCP" ]; then
 308                 /sbin/iptables -A INPUT -p tcp --source-port 67 --destination-port 68 -i $IFACE -j ACCEPT
 309                 /sbin/iptables -A INPUT -p udp --source-port 67 --destination-port 68 -i $IFACE -j ACCEPT
 310         fi
 311         if [ "$PROTOCOL" == "RFC1483" -a "$METHOD" == "DHCP" ]; then
 312                 /sbin/iptables -A INPUT -p tcp --source-port 67 --destination-port 68 -i $IFACE -j ACCEPT
 313                 /sbin/iptables -A INPUT -p udp --source-port 67 --destination-port 68 -i $IFACE -j ACCEPT
 314         fi
 315
 316         # run local firewall configuration, if present
 317         if [ -x /etc/sysconfig/firewall.local ]; then
 318                 /etc/sysconfig/firewall.local stop
 319         fi
 320
 321         if [ "$DROPINPUT" == "on" ]; then
 322                 /sbin/iptables -A INPUT   -m limit --limit 10/minute -j LOG --log-prefix "DROP_INPUT "
 323         fi
 324         /sbin/iptables -A INPUT -j DROP -m comment --comment "DROP_INPUT"
 325         if [ "$DROPOUTPUT" == "on" ]; then
 326                 /sbin/iptables -A FORWARD -m limit --limit 10/minute -j LOG --log-prefix "DROP_OUTPUT "
 327         fi
 328         /sbin/iptables -A FORWARD -j DROP -m comment --comment "DROP_OUTPUT"
 329         ;;
 330   stopovpn)
 331         # stop openvpn
 332         /usr/local/bin/openvpnctrl --delete-chains-and-rules
 333         ;;
 334   reload)
 335         iptables_red
 336
 337         # run local firewall configuration, if present
 338         if [ -x /etc/sysconfig/firewall.local ]; then
 339                 /etc/sysconfig/firewall.local reload
 340         fi
 341         ;;
 342   restart)
 343         $0 stop
 344         $0 stopovpn
 345         $0 start
 346         $0 startovpn
 347         ;;
 348   *)
 349         echo "Usage: $0 {start|stop|reload|restart}"
 350         exit 1
 351         ;;
 352 esac
 353
 354 exit 0