tip จากเวบรวมพลคนรัก freebsd
Tips Tips เปิด Ports ที่เราต้องการใช้งานในระบบปฏิบัติการ FreeBSD
ตัวอย่าง ต้องการเปิดใช้งาน Ports 8443 ใช้คำสั่งดังนี้
# ipfw add 250 allow tcp from any to any dst-port 8443
หรือ
# ipfw add 250 allow udp from any to any dst-port 8443
--------------------------------------------------------------------------------
#/etc/rc.conf
firewall_enable="YES"
firewall_type="OPEN"
firewall_script="/etc/ipfw.rules"
firewall_quite="YES"
firewall_logging="YES"
++++++++++++++++++
#/etc/ipfw.rules
cmd="ipfw -q add"
ipfw -q -f flush
$cmd 05 allow all from any to any via lo0
$cmd 10 deny all from any to 127.0.0.0/8
$cmd 15 deny all from 127.0.0.0/8 to any
$cmd 20 deny tcp from any to any frag
$cmd 25 check-state
$cmd 30 allow tcp from any to any established
$cmd 35 allow all from any to any out keep-state
$cmd 40 allow icmp from any to any
$cmd 45 allow udp from any to any 21 in keep-state
$cmd 46 allow tcp from any to any 21 in setup keep-state
$cmd 50 allow tcp from any to any 22 in setup keep-state
$cmd 55 allow tcp from any to any 25 in setup keep-state
$cmd 60 allow udp from any to any 53 in keep-state
$cmd 61 allow tcp from any to any 53 in setup keep-state
$cmd 65 allow tcp from any to any 80 in setup keep-state
$cmd 70 allow tcp from any to any 443 in setup keep-state
$cmd 75 allow tcp from any to any 110 in setup keep-state
$cmd 80 allow tcp from any to any 143 in setup keep-state
$cmd 85 allow tcp from any to any 8080 in setup keep-state
$cmd 500 pass all from any to me limit src-addr 2
$cmd 999 deny log all from any to any
อีก tip
The following rules go into /etc/ipfw.rules.
################ Start of IPFW rules file ################################ Flush out the list before we begin.ipfw -q -f flush# Set rules command prefixcmd="ipfw -q add"pif="dc0" # public interface name of NIC # facing the public Internet################################################################## No restrictions on Inside LAN Interface for private network# Not needed unless you have LAN.# Change xl0 to your LAN NIC interface name##################################################################$cmd 00005 allow all from any to any via xl0################################################################## No restrictions on Loopback Interface#################################################################$cmd 00010 allow all from any to any via lo0################################################################## Allow the packet through if it has previous been added to the# the "dynamic" rules table by a allow keep-state statement.#################################################################$cmd 00015 check-state################################################################## Interface facing Public Internet (Outbound Section)# Interrogate session start requests originating from behind the# firewall on the private network or from this gateway server# destine for the public Internet.################################################################## Allow out access to my ISP's Domain name server.# x.x.x.x must be the IP address of your ISP.s DNS# Dup these lines if your ISP has more than one DNS server# Get the IP addresses from /etc/resolv.conf file$cmd 00110 allow tcp from any to x.x.x.x 53 out via $pif setup keep-state$cmd 00111 allow udp from any to x.x.x.x 53 out via $pif keep-state# Allow out access to my ISP's DHCP server for cable/DSL configurations.# This rule is not needed for .user ppp. connection to the public Internet.# so you can delete this whole group.# Use the following rule and check log for IP address.# Then put IP address in commented out rule & delete first rule$cmd 00120 allow log udp from any to any 67 out via $pif keep-state#$cmd 00120 allow udp from any to x.x.x.x 67 out via $pif keep-state# Allow out non-secure standard www function$cmd 00200 allow tcp from any to any 80 out via $pif setup keep-state# Allow out secure www function https over TLS SSL$cmd 00220 allow tcp from any to any 443 out via $pif setup keep-state# Allow out send & get email function$cmd 00230 allow tcp from any to any 25 out via $pif setup keep-state$cmd 00231 allow tcp from any to any 110 out via $pif setup keep-state# Allow out FBSD (make install & CVSUP) functions# Basically give user root "GOD" privileges.$cmd 00240 allow tcp from me to any out via $pif setup keep-state uid root# Allow out ping$cmd 00250 allow icmp from any to any out via $pif keep-state# Allow out Time$cmd 00260 allow tcp from any to any 37 out via $pif setup keep-state# Allow out nntp news (i.e. news groups)$cmd 00270 allow tcp from any to any 119 out via $pif setup keep-state# Allow out secure FTP, Telnet, and SCP# This function is using SSH (secure shell)$cmd 00280 allow tcp from any to any 22 out via $pif setup keep-state# Allow out whois$cmd 00290 allow tcp from any to any 43 out via $pif setup keep-state# deny and log everything else that.s trying to get out.# This rule enforces the block all by default logic.$cmd 00299 deny log all from any to any out via $pif################################################################## Interface facing Public Internet (Inbound Section)# Check packets originating from the public Internet# destined for this gateway server or the private network.################################################################## Deny all inbound traffic from non-routable reserved address spaces$cmd 00300 deny all from 192.168.0.0/16 to any in via $pif #RFC 1918 private IP$cmd 00301 deny all from 172.16.0.0/12 to any in via $pif #RFC 1918 private IP$cmd 00302 deny all from 10.0.0.0/8 to any in via $pif #RFC 1918 private IP$cmd 00303 deny all from 127.0.0.0/8 to any in via $pif #loopback$cmd 00304 deny all from 0.0.0.0/8 to any in via $pif #loopback$cmd 00305 deny all from 169.254.0.0/16 to any in via $pif #DHCP auto-config$cmd 00306 deny all from 192.0.2.0/24 to any in via $pif #reserved for docs$cmd 00307 deny all from 204.152.64.0/23 to any in via $pif #Sun cluster interconnect$cmd 00308 deny all from 224.0.0.0/3 to any in via $pif #Class D & E multicast# Deny public pings$cmd 00310 deny icmp from any to any in via $pif# Deny ident$cmd 00315 deny tcp from any to any 113 in via $pif# Deny all Netbios service. 137=name, 138=datagram, 139=session# Netbios is MS/Windows sharing services.# Block MS/Windows hosts2 name server requests 81$cmd 00320 deny tcp from any to any 137 in via $pif$cmd 00321 deny tcp from any to any 138 in via $pif$cmd 00322 deny tcp from any to any 139 in via $pif$cmd 00323 deny tcp from any to any 81 in via $pif# Deny any late arriving packets$cmd 00330 deny all from any to any frag in via $pif# Deny ACK packets that did not match the dynamic rule table$cmd 00332 deny tcp from any to any established in via $pif# Allow traffic in from ISP's DHCP server. This rule must contain# the IP address of your ISP.s DHCP server as it.s the only# authorized source to send this packet type.# Only necessary for cable or DSL configurations.# This rule is not needed for .user ppp. type connection to# the public Internet. This is the same IP address you captured# and used in the outbound section.#$cmd 00360 allow udp from any to x.x.x.x 67 in via $pif keep-state# Allow in standard www function because I have apache server$cmd 00400 allow tcp from any to me 80 in via $pif setup limit src-addr 2# Allow in secure FTP, Telnet, and SCP from public Internet$cmd 00410 allow tcp from any to me 22 in via $pif setup limit src-addr 2# Allow in non-secure Telnet session from public Internet# labeled non-secure because ID & PW are passed over public# Internet as clear text.# Delete this sample group if you do not have telnet server enabled.$cmd 00420 allow tcp from any to me 23 in via $pif setup limit src-addr 2# Reject & Log all incoming connections from the outside$cmd 00499 deny log all from any to any in via $pif# Everything else is denied by default# deny and log all packets that fell through to see what they are$cmd 00999 deny log all from any to any################ End of IPFW rules file ###############################--------------------------------------------------------------------------------ลอง netstat -an |grep LIST ดูนะครับว่ามี listen port ไหนอยู่บ้าง
netstat -na|grep tcp ดูเครื่องตัวเองว่าเปิด port อะไรไว้
sockstat -4
อีก tips
http://gotoknow.org/blog/patrickz/18859
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