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50 lines
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50 lines
2.0 KiB
Plaintext
= PF firewall (FreeBSD, OpenBSD) configuration and debug commands cheat sheet
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:homepage: https://yurisk.info
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Author: Yuri Slobodyanyuk, https://www.linkedin.com/in/yurislobodyanyuk/
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== PF (Packet Filter) management for FreeBSD & OpenBSD
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[cols=2, options="header"]
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|===
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|Command
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|Description
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|*pfct -d*
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|Disable PF in place, does not survive reboot.
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|*pfctl -ef /etc/pf.conf*
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|Enable PF and load the rule set from file `/etc/pf.conf` in one go.
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|*pfctl -nf /etc/pf.conf*
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|Parse security rules stored in a file without installing them (dry run).
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|*pfctl -F <all/rules/nat/states>*
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a| Flush, accordingly:
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- `all` Everything (filter rules, nat, but NOT sateful table - those already connected will stay so). Blank/flushed rules mean "permit any any".
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- `rules` Rules only (stateful table of existing connections stay intact)
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- `nat` NAT rules only
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- `states` Stateful table (but again - active connections stay alive)
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|*pfct -k <source IP of connection to clear> [-k <destination>]*
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|Kill an active connection from the state table. You can specify IP address as the 1st selector to the 1st `-k` and optionally, destination selector with another `-k` key. `0.0.0.0/0` as a wildcard can be used. E.g. to clear all connections from any to 10.10.10.13/32 `pfctl -k 0.0.0.0/0 10.10.10.13/32`. To add selectors, look at available ones via *pfctl -s state*.
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|*pfctl -z*
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|Clear all per rule statistics/counters
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|*pass in quick on egress from 62.13.77.141 to any*
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| 'Quick' rule, means allow this traffic to pass through on all interfaces, otherwise we would need 2nd rule allowing this traffic in _outgoing_ direction on egress interface, to allow destined to ANY port/protocol with the source being `62.13.77.141` and destination being ANY IP address behind the PF firewall. NOTE: here, `egress` is not a direction, but a group name to which the interface in question (`em0`) belongs to. In OpenBSD you set it in a file `/etc/hostname.em0: group egress` or in real-time with the command: `ifconfig em0 group egress`.
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|===
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