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