> On Jan 2, 2023, at 10:35 AM, Michael Keuter <li...@mksolutions.info> wrote: > > > >> Am 02.01.2023 um 17:21 schrieb Lonnie Abelbeck <li...@lonnie.abelbeck.com>: >> >> Hi Michael, >> >> Referring to the "apply_ipset_netset()" function (here [1]) >> >> Add "-exist" to the "create" and "add" (man-page [2]) commands. >> >> Note that you can create the ipset from a text file within the >> /etc/arno-iptables-firewall/custom-rules script. Edit your text file and >> reload the firewall. >> >> Using "ipset create -exist ..." will not fail if the ipset already exists. >> "ipset flush ..." will clear any pre-existing ipset. >> >> Tip -> I would probably use "hash:net" instead of "hash:ip" so you could use >> CIDRs if you wanted. >> >> custom-rules script snippet >> -- >> ipset create -exist udp_sip_hosts hash:net >> ipset flush udp_sip_hosts >> >> ## either a one-liner from a text file "sip-whitelist.netset" >> sed -n -r -e "s/^([0-9][0-9./]+)([[:space:]].*|)$/add -exist udp_sip_hosts >> \1/p" sip-whitelist.netset | ipset restore >> >> ## Or, loop getting IPv4s from a text file "sip-whitelist.netset" >> ipset add -exist udp_sip_hosts <IP Address> >> ## done-loop >> >> iptables -A EXT_INPUT_CHAIN -m set --match-set udp_sip_hosts src -p udp >> --dport 5060 -j ACCEPT >> -- >> >> Lonnie >> >> [1] >> https://github.com/astlinux-project/astlinux/blob/d95ba9c3914b135da4440cb95f32af61a41d4650/package/arnofw/aif/bin/arno-iptables-firewall#L4275 >> >> [2] https://ipset.netfilter.org/ipset.man.html >> >> >>>> On Jan 1, 2023, at 11:44 PM, Michael Knill >>>> <michael.kn...@ipcsolutions.com.au> wrote: >>> >>> Hi All >>> Merry Christmas and Happy New Year. >>> >>> Just rejuvenating this thread as I am building our new softswitch and >>> playing with ipset as you offered below. >>> We have done the following: >>> >>> Using CLI: >>> ipset create udp_sip_hosts hash:ip >>> ipset add udp_sip_hosts <IP Address> >>> >>> In custom-rules.conf >>> iptables -A EXT_INPUT_CHAIN -m set --match-set udp_sip_hosts src -p udp >>> --dport 5060 -j ACCEPT >>> >>> It all seems to work fine but I obviously am an iptables noob as I have no >>> idea what to do when I make changes to the ipset as it does not change even >>> after a firewall restart. >>> I'm sure there is something I need to do which will get iptables to reread >>> the ipset? >>> >>> Thanks guys. >>> >>> Regards >>> Michael Knill >>> >>> >>> >>> On 27/9/2021, 10:54 am, "Lonnie Abelbeck" <li...@lonnie.abelbeck.com >>> <mailto:li...@lonnie.abelbeck.com>> wrote: >>> >>> >>> Michael, >>> >>> >>> The /mnt/kd/arno-iptables-firewall/custom-rules is a basic shell script, so >>> parsing sip.conf using 'sed' or such should be reasonably straightforward. >>> >>> >>> BTW, for extra credit, if you combined all the allowed SIP IPs into an >>> ipset (ex. udp_sip_hosts), you can very efficiently match all of them with >>> only one rule: >>> -- >>> iptables -A EXT_INPUT_CHAIN -m set --match-set udp_sip_hosts src -p udp >>> --dport 5060 -j ACCEPT >>> -- >>> That would allow you to rebuild only the "udp_sip_hosts" ipset when the >>> sip.conf got changed, without rebuilding the firewall. Though requires some >>> 'ipset' command knowledge, though not complex at all. >>> >>> >>> Example 'ipset' usage in AstLinux: >>> https://github.com/astlinux-project/astlinux/blob/d95ba9c3914b135da4440cb95f32af61a41d4650/package/arnofw/aif/bin/arno-iptables-firewall#L4275 >>> >>> <https://github.com/astlinux-project/astlinux/blob/d95ba9c3914b135da4440cb95f32af61a41d4650/package/arnofw/aif/bin/arno-iptables-firewall#L4275> >>> >>> >>> If you only use IPv4 a lot of the example can be simplified. >>> >>> >>> Lonnie >>> >>> >>> >>> >>> >>> >>>> On Sep 26, 2021, at 7:17 PM, Michael Knill >>>> <michael.kn...@ipcsolutions.com.au >>>> <mailto:michael.kn...@ipcsolutions.com.au>> wrote: >>>> >>>> Thanks Lonnie. >>>> >>>> Actually now that I think about it, is there any reason why the custom >>>> rule could not parse sip.conf for host=<IP Address> and open up all Public >>>> IP's? >>>> It would mean that you would need to restart the firewall every time you >>>> modified sip.conf but I'm sure we could build this into our portal very >>>> simply. >>>> >>>> Regards >>>> Michael Knill >>>> >>>> On 27/9/21, 9:47 am, "Lonnie Abelbeck" <li...@lonnie.abelbeck.com >>>> <mailto:li...@lonnie.abelbeck.com>> wrote: >>>> >>>> Hi Michael, >>>> >>>> With 300 rules and the same across all your boxes, I would use >>>> /mnt/kd/arno-iptables-firewall/custom-rules to define these. >>>> >>>> Very similar to the deny_ext_local() example I posted recently, but the >>>> reverse ... pass_ext_local() using -j ACCEPT >>>> >>>> Without testing, something like ... >>>> -- >>>> pass_ext_local() >>>> { >>>> local proto="$1" host="$2" port="$3" >>>> >>>> echo "[CUSTOM RULE] Pass EXT->Local for Proto: $proto, Host: $host, Port: >>>> $port" >>>> iptables -A EXT_INPUT_CHAIN -s $host -p $proto --dport $port -j ACCEPT >>>> } >>>> ## uncomment to enable ## >>>> #pass_ext_local udp 1.2.3.4 5060 >>>> #pass_ext_local tcp 1.2.3.0/24 5061 >>>> -- >>>> >>>> If you only use udp/5060, you could simplify things, maybe only one "echo" >>>> statement and a variable defining all 300 IPs. Generic shell scripting. >>>> >>>> Again untested ... >>>> -- >>>> pass_ext_local_udp_sip() >>>> { >>>> local host proto="udp" port="5060" IFS >>>> local sip_hosts="1.2.3.4 1.22.33.40 1.22.33.41 1.22.33.42 1.22.33.43 >>>> 1.22.33.44 1.22.33.45 1.22.33.46 1.22.33.47 1.22.33.48" >>>> >>>> echo "[CUSTOM RULE] Pass EXT->Local for UDP/5060 SIP Hosts" >>>> unset IFS >>>> for host in $sip_hosts; do >>>> iptables -A EXT_INPUT_CHAIN -s $host -p $proto --dport $port -j ACCEPT >>>> done >>>> } >>>> pass_ext_local_udp_sip >>>> -- >>>> >>>> Alternatively, you could define the sip_hosts variable with a file if >>>> desired. >>>> >>>> Lonnie >>>> >>>> >>>> >>>> >>>> >>>>> On Sep 26, 2021, at 5:32 PM, Michael Knill >>>>> <michael.kn...@ipcsolutions.com.au >>>>> <mailto:michael.kn...@ipcsolutions.com.au>> wrote: >>>>> >>>>> Hi Group >>>>> >>>>> I'm looking to have a large number of firewall entries in Astlinux e.g. >>>>> 300. They would be all the same e.g. I want to open port 5060 from >>>>> multiple sites. >>>>> Is there an easier/neater way to do this other than lots of firewall >>>>> entries in the Firewall Tab? >>>>> >>>>> Regards >>>>> >>>>> Michael Knill >>>>> Managing Director >>>>> > > You can also easily use Custom Blocklists in your "user.conf": > > BLOCKLIST_CUSTOM_URLS=" > https://feodotracker.abuse.ch/downloads/ipblocklist.txt > https://sslbl.abuse.ch/blacklist/sslipblacklist.txt > " > > Michael
Yes, but he wants a SIP specific inbound whitelist. Lonnie _______________________________________________ Astlinux-users mailing list Astlinux-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/astlinux-users Donations to support AstLinux are graciously accepted via PayPal to pay...@krisk.org.
