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 conntrack --ctstate NEW -j NEWNOTSYN
  72
  73         /sbin/iptables -A INPUT   -p tcp -j BADTCP
  74         /sbin/iptables -A FORWARD -p tcp -j BADTCP
  75
  76         # Connection tracking chain
  77         /sbin/iptables -N CONNTRACK
  78         /sbin/iptables -A CONNTRACK -m conntrack --ctstate ESTABLISHED,RELATED -j ACCEPT
  79
  80         # Fix for braindead ISP's
  81         /sbin/iptables -A FORWARD -p tcp --tcp-flags SYN,RST SYN -j TCPMSS --clamp-mss-to-pmtu
  82
  83         # CUSTOM chains, can be used by the users themselves
  84         /sbin/iptables -N CUSTOMINPUT
  85         /sbin/iptables -A INPUT -j CUSTOMINPUT
  86         /sbin/iptables -N GUARDIAN
  87         /sbin/iptables -A INPUT -j GUARDIAN
  88         /sbin/iptables -N OVPNBLOCK
  89         /sbin/iptables -A FORWARD -j OVPNBLOCK
  90         /sbin/iptables -A FORWARD -j GUARDIAN
  91         /sbin/iptables -N CUSTOMFORWARD
  92         /sbin/iptables -A FORWARD -j CUSTOMFORWARD
  93         /sbin/iptables -N CUSTOMOUTPUT
  94         /sbin/iptables -A OUTPUT -j OVPNBLOCK
  95         /sbin/iptables -A OUTPUT -j CUSTOMOUTPUT
  96         /sbin/iptables -N OUTGOINGFW
  97         /sbin/iptables -A OUTPUT -j OUTGOINGFW
  98         /sbin/iptables -t nat -N CUSTOMPREROUTING
  99         /sbin/iptables -t nat -N OVPNNAT
 100         /sbin/iptables -t nat -A PREROUTING -j CUSTOMPREROUTING
 101         /sbin/iptables -t nat -N CUSTOMPOSTROUTING
 102         /sbin/iptables -t nat -A POSTROUTING -j CUSTOMPOSTROUTING
 103         /sbin/iptables -t nat -A POSTROUTING -j OVPNNAT
 104
 105         # IPTV chains for IGMPPROXY
 106         /sbin/iptables -N IPTVINPUT
 107         /sbin/iptables -A INPUT -j IPTVINPUT
 108         /sbin/iptables -N IPTVFORWARD
 109         /sbin/iptables -A FORWARD -j IPTVFORWARD
 110
 111         # Filtering ovpn networks INPUT
 112         /sbin/iptables -A INPUT -j OVPNBLOCK
 113
 114         # filtering from GUI
 115         /sbin/iptables -N GUIINPUT
 116         /sbin/iptables -A INPUT -j GUIINPUT
 117         /sbin/iptables -A GUIINPUT -p icmp --icmp-type 8 -j ACCEPT
 118
 119         # Accept everything connected
 120         for i in INPUT FORWARD OUTPUT; do
 121                 /sbin/iptables -A ${i} -j CONNTRACK
 122         done
 123
 124         # Accept everything on lo
 125         iptables -A INPUT  -i lo -m conntrack --ctstate NEW -j ACCEPT
 126         iptables -A OUTPUT -o lo -m conntrack --ctstate NEW -j ACCEPT
 127
 128         # trafic from ipsecX/TUN/TAP interfaces, before "-i GREEN_DEV" accept everything
 129         /sbin/iptables -N IPSECINPUT
 130         /sbin/iptables -N IPSECFORWARD
 131         /sbin/iptables -N IPSECOUTPUT
 132         /sbin/iptables -N OPENSSLVIRTUAL
 133         /sbin/iptables -A INPUT -j IPSECINPUT
 134         /sbin/iptables -A INPUT -j OPENSSLVIRTUAL -m comment --comment "OPENSSLVIRTUAL INPUT"
 135         /sbin/iptables -A FORWARD -j IPSECFORWARD
 136         /sbin/iptables -A FORWARD -j OPENSSLVIRTUAL -m comment --comment "OPENSSLVIRTUAL FORWARD"
 137         /sbin/iptables -A OUTPUT -j IPSECOUTPUT
 138         /sbin/iptables -t nat -N IPSECNAT
 139         /sbin/iptables -t nat -A POSTROUTING -j IPSECNAT
 140
 141         # Input Firewall
 142         /sbin/iptables -N INPUTFW
 143         /sbin/iptables -A INPUT -m conntrack --ctstate NEW -j INPUTFW
 144
 145         # localhost and ethernet.
 146         /sbin/iptables -A INPUT   -i lo -m conntrack --ctstate NEW -j ACCEPT
 147         /sbin/iptables -A INPUT   -s 127.0.0.0/8 -m conntrack --ctstate NEW -j DROP   # Loopback not on lo
 148         /sbin/iptables -A INPUT   -d 127.0.0.0/8 -m conntrack --ctstate NEW -j DROP
 149         /sbin/iptables -A FORWARD -i lo -m conntrack --ctstate NEW -j ACCEPT
 150         /sbin/iptables -A FORWARD -s 127.0.0.0/8 -m conntrack --ctstate NEW -j DROP
 151         /sbin/iptables -A FORWARD -d 127.0.0.0/8 -m conntrack --ctstate NEW -j DROP
 152         /sbin/iptables -A INPUT   -i $GREEN_DEV  -m conntrack --ctstate NEW -j ACCEPT ! -p icmp
 153
 154         # allow DHCP on BLUE to be turned on/off
 155         /sbin/iptables -N DHCPBLUEINPUT
 156         /sbin/iptables -A INPUT -j DHCPBLUEINPUT
 157
 158         # WIRELESS chains
 159         /sbin/iptables -N WIRELESSINPUT
 160         /sbin/iptables -A INPUT -m conntrack --ctstate NEW -j WIRELESSINPUT
 161         /sbin/iptables -N WIRELESSFORWARD
 162         /sbin/iptables -A FORWARD -m conntrack --ctstate NEW -j WIRELESSFORWARD
 163
 164         # Forward Firewall
 165         /sbin/iptables -N FORWARDFW
 166         /sbin/iptables -A FORWARD -j FORWARDFW
 167
 168         # OPenSSL
 169         /sbin/iptables -N OPENSSLPHYSICAL
 170         /sbin/iptables -A INPUT -j OPENSSLPHYSICAL
 171
 172         # RED chain, used for the red interface
 173         /sbin/iptables -N REDINPUT
 174         /sbin/iptables -A INPUT -j REDINPUT
 175         /sbin/iptables -N REDFORWARD
 176         /sbin/iptables -A FORWARD -j REDFORWARD
 177         /sbin/iptables -t nat -N REDNAT
 178         /sbin/iptables -t nat -A POSTROUTING -j REDNAT
 179
 180         iptables_red
 181
 182         # Custom prerouting chains (for transparent proxy and port forwarding)
 183         /sbin/iptables -t nat -N SQUID
 184         /sbin/iptables -t nat -A PREROUTING -j SQUID
 185         /sbin/iptables -t nat -N NAT_DESTINATION
 186         /sbin/iptables -t nat -N NAT_SOURCE
 187         /sbin/iptables -t nat -A PREROUTING -j NAT_DESTINATION
 188         /sbin/iptables -t nat -I POSTROUTING 3 -j NAT_SOURCE
 189
 190
 191
 192         # upnp chain for our upnp daemon
 193         /sbin/iptables -t nat -N UPNPFW
 194         /sbin/iptables -t nat -A PREROUTING -j UPNPFW
 195         /sbin/iptables -N UPNPFW
 196         /sbin/iptables -A FORWARD -m conntrack --ctstate NEW -j UPNPFW
 197
 198         # Postrouting rules (for port forwarding)
 199         /sbin/iptables -t nat -A POSTROUTING -m mark --mark 1 -j SNAT --to-source $GREEN_ADDRESS
 200         if [ "$BLUE_DEV" != "" ]; then
 201                 /sbin/iptables -t nat -A POSTROUTING -m mark --mark 2 -j SNAT --to-source $BLUE_ADDRESS
 202         fi
 203         if [ "$ORANGE_DEV" != "" ]; then
 204                 /sbin/iptables -t nat -A POSTROUTING -m mark --mark 3 -j SNAT --to-source $ORANGE_ADDRESS
 205         fi
 206
 207         # run local firewall configuration, if present
 208         if [ -x /etc/sysconfig/firewall.local ]; then
 209                 /etc/sysconfig/firewall.local start
 210         fi
 211
 212         # run openvpn
 213         /usr/local/bin/openvpnctrl --create-chains-and-rules
 214
 215         # run wirelessctrl
 216         /usr/local/bin/wirelessctrl
 217
 218         #POLICY CHAIN
 219         /sbin/iptables -N POLICYIN
 220         /sbin/iptables -A INPUT -j POLICYIN
 221         /sbin/iptables -N POLICYFWD
 222         /sbin/iptables -A FORWARD -j POLICYFWD
 223         /sbin/iptables -N POLICYOUT
 224         /sbin/iptables -A OUTPUT -j POLICYOUT
 225
 226         /usr/sbin/firewall-policy
 227
 228         # read new firewall
 229         /usr/local/bin/forwardfwctrl
 230
 231         if [ "$DROPINPUT" == "on" ]; then
 232                 /sbin/iptables -A INPUT   -m limit --limit 10/minute -j LOG --log-prefix "DROP_INPUT"
 233         fi
 234         /sbin/iptables -A INPUT -j DROP -m comment --comment "DROP_INPUT"
 235         if [ "$DROPFORWARD" == "on" ]; then
 236                 /sbin/iptables -A FORWARD -m limit --limit 10/minute -j LOG --log-prefix "DROP_FORWARD"
 237         fi
 238         /sbin/iptables -A FORWARD -j DROP -m comment --comment "DROP_FORWARD"
 239 }
 240
 241 iptables_red() {
 242         /sbin/iptables -F REDINPUT
 243         /sbin/iptables -F REDFORWARD
 244         /sbin/iptables -t nat -F REDNAT
 245
 246         # PPPoE / PPTP Device
 247         if [ "$IFACE" != "" ]; then
 248                 # PPPoE / PPTP
 249                 if [ "$DEVICE" != "" ]; then
 250                         /sbin/iptables -A REDINPUT -i $DEVICE -j ACCEPT
 251                 fi
 252                 if [ "$RED_TYPE" == "PPTP" -o "$RED_TYPE" == "PPPOE" ]; then
 253                         if [ "$RED_DEV" != "" ]; then
 254                                 /sbin/iptables -A REDINPUT -i $RED_DEV -j ACCEPT
 255                         fi
 256                 fi
 257         fi
 258
 259         # PPTP over DHCP
 260         if [ "$DEVICE" != "" -a "$TYPE" == "PPTP" -a "$METHOD" == "DHCP" ]; then
 261                 /sbin/iptables -A REDINPUT -p tcp --source-port 67 --destination-port 68 -i $DEVICE -j ACCEPT
 262                 /sbin/iptables -A REDINPUT -p udp --source-port 67 --destination-port 68 -i $DEVICE -j ACCEPT
 263         fi
 264
 265         # Orange pinholes
 266         if [ "$ORANGE_DEV" != "" ]; then
 267                 # This rule enables a host on ORANGE network to connect to the outside
 268                 # (only if we have a red connection)
 269                 if [ "$IFACE" != "" ]; then
 270                         /sbin/iptables -A REDFORWARD -i $ORANGE_DEV -o $IFACE -j ACCEPT
 271                 fi
 272         fi
 273
 274         if [ "$IFACE" != "" -a -f /var/ipfire/red/active ]; then
 275                 # DHCP
 276                 if [ "$RED_DEV" != "" -a "$RED_TYPE" == "DHCP" ]; then
 277                         /sbin/iptables -A REDINPUT -p tcp --source-port 67 --destination-port 68 -i $IFACE -j ACCEPT
 278                         /sbin/iptables -A REDINPUT -p udp --source-port 67 --destination-port 68 -i $IFACE -j ACCEPT
 279                 fi
 280                 if [ "$METHOD" == "DHCP"  -a "$PROTOCOL" == "RFC1483" ]; then
 281                         /sbin/iptables -A REDINPUT -p tcp --source-port 67 --destination-port 68 -i $IFACE -j ACCEPT
 282                         /sbin/iptables -A REDINPUT -p udp --source-port 67 --destination-port 68 -i $IFACE -j ACCEPT
 283                 fi
 284
 285                 # Outgoing masquerading (don't masqerade IPSEC (mark 50))
 286                 /sbin/iptables -t nat -A REDNAT -m mark --mark 50 -o $IFACE -j RETURN
 287                 /sbin/iptables -t nat -A REDNAT -o $IFACE -j MASQUERADE
 288
 289         fi
 290 }
 291
 292 # See how we were called.
 293 case "$1" in
 294   start)
 295         iptables_init
 296         ;;
 297   reload)
 298         iptables_red
 299         # run local firewall configuration, if present
 300         if [ -x /etc/sysconfig/firewall.local ]; then
 301                 /etc/sysconfig/firewall.local reload
 302         fi
 303         ;;
 304   restart)
 305         # run local firewall configuration, if present
 306         if [ -x /etc/sysconfig/firewall.local ]; then
 307                 /etc/sysconfig/firewall.local stop
 308         fi
 309         $0 start
 310         ;;
 311   *)
 312         echo "Usage: $0 {start|reload|restart}"
 313         exit 1
 314         ;;
 315 esac
 316
 317 exit 0