When attempting to use a Custom Rules File for Security Level Configuration the custom rules are applied after the default rules as expected, however, the default rules include the following line as their last entry: REJECT all -- anywhere anywhere reject-with icmp-host-prohibited Which prevents any custom rules from being executed. In my case I have created the following custom rules file: -A RH-Firewall-1-INPUT -j LOG --log-prefix "RH-Firewall-1-INPUT DROP " -A RH-Firewall-1-INPUT -j DROP After applying this custom rules file by starting system-config-securitylevel -> Advanced Options -> Use the custom rules file: -> /etc/sysconfig/iptables.custom -> Apply, the chain looks like this: ... 12 ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 state NEW tcp dpt:139 13 ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 state NEW tcp dpt:445 14 REJECT all -- 0.0.0.0/0 0.0.0.0/0 reject-with icmp-host-prohibited 15 LOG all -- 0.0.0.0/0 0.0.0.0/0 LOG flags 0 level 4 prefix `RH-Firewall-1-INPUT DROP ' 16 DROP all -- 0.0.0.0/0 0.0.0.0/0 As you can see, my custom rules are added after the REJECT ALL target. It seems that this is not the expected behavior. Furthermore, it seems that I should be able to define the last rule to accomplish this with the need to use a custom rules file. Version-Release number of selected component (if applicable): system-config-securitylevel-1.7.0-6.fc7 iptables-1.3.8-6.fc7
Created attachment 291950 [details] Patch file to support custom rules within RH-Firewall-1-INPUT chain I have found the attached patch resolves my issue. Basically, if a custom rules file has been defined, a new chain is added to the filter table named RH-Firewall-Custom1-INPUT. Prior to the REJECT rule in RH-Firewall-1-INPUT, a jump target to RH-Firewall-Custom1-INPUT is defined. This will allow a user to define custom rules and have them executed in the filter table without the REJECT resulting in their rules being ignored if appended.
Here is my iptables chains that reflect my use case after applying the patch: ... 12 ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 state NEW tcp dpt:139 13 ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 state NEW tcp dpt:445 14 RH-Firewall-Custom1-INPUT all -- 0.0.0.0/0 0.0.0.0/0 15 REJECT all -- 0.0.0.0/0 0.0.0.0/0 reject-with icmp-host-prohibited Chain RH-Firewall-Custom1-INPUT (1 references) num target prot opt source destination 1 LOG all -- 0.0.0.0/0 0.0.0.0/0 LOG flags 0 level 4 prefix `RH-Firewall DROP ' 2 DROP all -- 0.0.0.0/0 0.0.0.0/0
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