tekrar merhabalar,
kurallarımın en başında belirtmiş olduğum
block in log-all all
block out log-all all
pass in quick on lo0 all
pass out quick on lo0 all
bu satırlarından sonra iç ağdaki kullanıcılarıma fw belli portlara ulaşma izini
verdim
pass in quick on $int_if proto tcp from $lan_net to any port {
22,25,80,110,8080,12200,443,444,53 } flags S/SA keep state
daha sonra fw nin dış modemlere bakan interfacelerinede çıkış izini verdim
pass out on $ext_if proto {tcp,udp} from $fwips to any keep state
pass out on $ext_if2 proto {tcp,udp} from $fwips to any keep state
iç ağdaki kullanıcılarım fw üzerinde izin verdiğim portlara bağlanabiliyorlar
problem yok ama izin vermeme rağmen dışarıdaki bir mail serverada
bağlanabiliyorlar.
bunu nasıl engelleyebilirim.
----- Original Message --pass in quick on $int_if proto tcp from $lan_net to
any port { 22,25,80,110,8080,12200,443,444,53 } flags S/SA keep state
From: vys
To: [email protected]
Sent: Wednesday, April 16, 2008 8:55 AM
Subject: Re: [FreeBSD] Freebsd + PF
Huzeyfe hocam bu değerli bilgiler için teşekkür ederim
sağlıçakla kalın....
----- Original Message -----
From: Huzeyfe ONAL
To: [email protected]
Sent: Tuesday, April 15, 2008 9:34 PM
Subject: RE: [FreeBSD] Freebsd + PF
Merhabalar,
1-3)ext_if uzerinden paketleri cikis ipleri ext_if2 olacak sekilde
natliyorum ve bu paketleri IF2 olarak isaretliyorum, sonra filtreleme kisminda
IF2 seklinde isaretlenmis paketleri diger arabirime gonderiyorum.
2) ext_if:0 daki :0 o arabirime ait ilk ip adresi manasina geliyor. Kendi
sistemimde ext_if uzerinde birden fazla ip adresi oldugu icin ilk ip adresini
kullanmam icin o sekilde belirtmem gerekiyor J
----------------------------------------------------------------------------
From: vys [mailto:[EMAIL PROTECTED]
Sent: Tuesday, April 15, 2008 8:36 PM
To: [email protected]
Subject: Re: [FreeBSD] Freebsd + PF
Hocam Tekrar Mrb,
Kurallarımı sizin söylediğiniz şekilde düzenledim ve sistem şuan
çalışıyor.Fakat göndermiş olduğunuz kurallarda anlamadığım kısımlar var bunları
açıklamız mümkünmü acaba. konuyu daha iyi kavrama açısından.
1. nat on $ext_if proto tcp from self to any port smtp tag IF2 ->
($ext_if2)
nat on $ext_if proto tcp from self to any port pop3 tag IF2 ->
($ext_if2) burdaki smtp veya pop3 tag IF2 satırıyla ne yapmak istiyoruz tag
IF2 nedir.
2.pass in quick log on $ext_if2 reply-to($ext_if2 $ext_gw2) proto tcp from
any to $ext_if2:0 port 80 keep state
satırındaki $ext_if2:0 ne anlama geliyor
3.pass out quick on $ext_if route-to ($ext_if2 $ext_gw2) tagged IF2 keep
state
burda $ext_if route-to ($ext_if2 $ext_gw2) tagged IF2 keep state ne
yapmak istiyoruz.
huzeyfe hocam inşallah çok fazla rahatsız etmemiyorumdur.
Saygılar......
----- Original Message ----- nat on $ext_if proto tcp from self to any
port smtp tag IF2 -> ($ext_if2)
nat on $ext_if proto tcp from self to any port pop3 tag IF2 -> ($ext_if2)
From: Huzeyfe ONAL
To: [email protected]
Sent: Tuesday, April 15, 2008 7:13 PM
Subject: RE: [FreeBSD] Freebsd + PF
Selamlar,
SMTP icin asagidaki kurali kullanabilirsiniz. Diger protokolleri de buna
bakarak cogaltabilirsiniz.
pass in quick log (all) on $ext_if0 reply-to($ext_if0 $ext_gw0) proto tcp
from any to $ext_if0:0 port 25 keep state
Firewalldan cikacak smtp paketleri icin ornegi bir onceki mailimde
bulabilirsiniz.
--------------------------------------------------------------------------
From: vys [mailto:[EMAIL PROTECTED]
Sent: Tuesday, April 15, 2008 7:06 PM
To: [email protected]
Subject: Re: [FreeBSD] Freebsd + PF
Huzeyfe Hocam Merhabalar,
Öncelikle konuyu daha anlamak açısından biraz daha örnekler veremeniz
mümkünmü acaba.
kullanılan sistem freebsd merak ettiğim konu ise sunucumdan attığım mail
veya başka bir şey 1. dsl den,sunucu üzerinden internette sörf yaparken 2.dsl
den çıkması için veya dışarıdaki bir ssh sunucusuna bağlandığımda 1. dsl den
çıksın gibi örnekleyerek verebilirseniz çok makbule geçer hocam.
saygılar....
----- Original Message -----
From: Huzeyfe ONAL
To: [email protected]
Sent: Tuesday, April 15, 2008 5:53 PM
Subject: RE: [FreeBSD] Freebsd + PF
Merhabalar,
Bir hat uzerinden gelen paketin ayni hattan geri donmesi icin reply-to
kullanmaniz gerekiyor.
Bunun haricinde route-to kavramini Firewall'un kendisi icin degil de
ic agdan gelen istekler icin bu sekilde kullanabilirsiniz. Firewallun
kendisinin urettigi trafigi farkli hatlara gondermek icin asagidaki gibi
nat/filtering kurallari yazmayi deneyin.
(II. hattan SMTP isteklerinin cikmasi icin)
nat on $ext_if proto tcp from self to any port smtp tag IF2 ->
($ext_if2)
pass out quick on $ext_if route-to ($ext_if2 $ext_gw2) tagged IF2 keep
state
(OpenSD 4.2 vs kullaniyorsaniz keep state'e gerek yok)
Ek olarak kurallariniza baktigimda eksik/yanlis tanimlar var. Genelde
tek hat dusunulerek yazilmis kurallar gibi gozukuyor.
En basitinden ;
pass in on $int_if route-to { ($ext_if $ext_gw1), ($ext_if2 $ext_gw2) }
round-robin from $lan_net to any keep state
kurali ile ic ag kullanicilarini iki hat uzerine dagitmis
gozukuyorsunuz, isteginiz bu kullanicilarin tek hat uzerinden olmasi ise tek
cikis gosterin ve round-robin kullanmayin.
------------------------------------------------------------------------
From: vys [mailto:[EMAIL PROTECTED]
Sent: Tuesday, April 15, 2008 1:03 PM
To: [email protected]
Subject: [FreeBSD] Freebsd + PF
Arkadaslar Merhaba,
daha öncede listede konu hakkinda sorularim olmustu ama hala
çözemedigim bir kaç durumu
sizlerle paylasmak istedim.
bir sunucu üzerinde hem proxy hemde mail server kurulu ve çalisir
durumda. simdi benim
yapmak istedigim ise bu sunucuda 2 adet dsl takill durumda packet
filterla mail sunucumun
mailleri gönderirken ve mailleri alirken adsl1 üzerinden
haberlessin,kullanicilariminda
internete çikarken veya baska kaynaklara ulasirkende adsl2 yi
kullanmasin istiyorum.
buna görede pf.conf umu düzenledim.bu noktada su sorunlarla
karsilasiyorum birincisi
disaridan mail sunucusuna telnet le baglanmaya çalistigimda baglanmiyor
loglarda ise pass
olarak görebiliyorum ama ayni sekilde sunucuma sshla baglandigimda
adsl2 üzerinden hiçbir
problem yok adsl1 üzerinden 25,110 sunucuya yönlendirilmis durumda
acaba gözden
kacirdigim veya bilmedigim bir seylerlemi var kural tablom asagidaki
gibidir.
###################################################
# Macros
###################################################
lan_net = "{ 10.0.0.0/24, 10.0.2.0/24, 10.0.3.0/24, 10.0.4.0/24 }"
int_if = "bge0"
ext_if = "vr0"
ext_if2 = "vr1"
ext_gw1 = "192.168.100.213" (Proxy için)
ext_gw2 = "192.168.110.25" (Mail Trafigi için)
fwips = "{127.0.0.1, 10.0.0.2, 192.168.100.212, 192.168.110.26}"
##################################################
#Tanimlar
##################################################
table <msn> persist file "/usr/local/etc/fw/msn"
table <ftp> persist file "/usr/local/etc/fw/ftp"
###################################################
# Set Optimizations
###################################################
set limit { frags 30000, states 25000 }
set loginterface $ext_if
scrub in all
##################################################
#Nat Kurallari
##################################################
nat on $ext_if from $lan_net to any -> ($ext_if)
nat on $ext_if2 from $lan_net to any -> ($ext_if2)
rdr on $int_if proto tcp from any to any port 80 -> 10.0.0.2 port 8080
##################################################
#Kurallar
##################################################
block in log-all all
block out log-all all
pass in quick on lo0 all
pass out quick on lo0 all
##################################################
#Route-to
##################################################
pass in on $int_if route-to { ($ext_if $ext_gw1), ($ext_if2 $ext_gw2) }
round-robin from $lan_net to any keep state
pass out on $ext_if route-to ($ext_if2 $ext_gw2) from $ext_if2 to any
keep state
pass out on $ext_if2 route-to ($ext_if $ext_gw1) from $ext_if to any
keep state
##################################################
#Port Bazli Routing
##################################################
pass out quick on $ext_if route-to ($ext_if2 $ext_gw2) proto tcp from
$fwips to any port 25 keep state
pass out quick on $ext_if2 proto tcp from $fwips to any port 25 keep
state
pass in quick log on $int_if route-to ($ext_if2 $ext_gw2) proto tcp
from $lan_net to any port 25 keep state
##################################################
# Firewalla izin veriliyor ç?k??lar
##################################################
pass out quick on $ext_if proto {tcp,udp} from $fwips to any keep state
pass out quick on $ext_if2 proto {tcp,udp} from $fwips to any keep
state
##################################################
#Lan_net ten Firewalla izin verilen Portlar
##################################################
pass in quick on $int_if proto tcp from $lan_net to any port {
22,25,80,110,8080,12200,443,444,53 } flags S/SA keep state
pass in quick on $int_if proto tcp from <msn> to any port = 1863 flags
S/SA keep state
pass in quick on $int_if proto tcp from <ftp> to any port = 21 flags
S/SA keep state
pass in quick on $int_if proto { udp, icmp } from $lan_net to any keep
state
##################################################
#Ext_if2 Uzerinden Gelisler
##################################################
pass in quick log on $ext_if2 proto tcp from any to any port
{25,80,110,53} flags S/SA keep state
##################################################
#Ext_if Uzerinden Gelisler
##################################################
pass in quick log on $ext_if proto tcp from any to any port = 22 flags
S/SA keep state
