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dman777
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PostPosted: Thu Aug 22, 2013 11:36 am    Post subject: IPTables Blocking Postfix Reply with quote

what would this iptables policy be blocking postfix from recieving emails? since it's default policy is ACCEPT the only rule I see that is truly blocking is the REJECT all -- anywhere anywhere reject-with icmp-host-prohibited


Code:
Chain INPUT (policy ACCEPT)
target prot opt source destination
ACCEPT tcp -- anywhere anywhere tcp dpt:mysql
ACCEPT tcp -- anywhere anywhere tcp dpt:submission
ACCEPT tcp -- anywhere anywhere tcp dpt:http
ACCEPT tcp -- anywhere anywhere tcp dpt:http
ACCEPT all -- anywhere anywhere state RELATED,ESTABLISHED
ACCEPT icmp -- anywhere anywhere
ACCEPT all -- anywhere anywhere
ACCEPT tcp -- anywhere anywhere state NEW tcp dpt:ssh
REJECT all -- anywhere anywhere reject-with icmp-host-prohibited
ACCEPT tcp -- anywhere anywhere tcp dpt:urd
ACCEPT tcp -- anywhere anywhere tcp dpt:pop3
ACCEPT tcp -- anywhere anywhere tcp dpt:pop3s
ACCEPT tcp -- anywhere anywhere tcp dpt:imap
ACCEPT tcp -- anywhere anywhere tcp dpt:imaps
Chain FORWARD (policy ACCEPT)
target prot opt source destination
REJECT all -- anywhere anywhere reject-with icmp-host-prohibited
Chain OUTPUT (policy ACCEPT)
target prot opt source destination
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massimo
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PostPosted: Thu Aug 22, 2013 12:03 pm    Post subject: Reply with quote

Since the REJECT rule is before the pop3, imap, ... rules postfix will not receive any communication on these ports.
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dman777
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PostPosted: Thu Aug 22, 2013 12:07 pm    Post subject: Reply with quote

Thanks. since this default policy is set to ACCEPT how come it matters?
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massimo
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PostPosted: Thu Aug 22, 2013 6:49 pm    Post subject: Reply with quote

Take a look at the output of iptables -Lv. This should clear things up for you.
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PaulBredbury
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PostPosted: Thu Aug 22, 2013 8:28 pm    Post subject: Reply with quote

dman777 wrote:
how come it matters?

The order of the rules is crucially important. If you REJECT first, then that is what will happen - they cannot be ACCEPTed later, they've already been REJECTed.

Change the order of the rules, or the filtering criteria.
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