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Linux ISG

This repo is fork of Linux ISG project from Oleg A. Arkhangelsky.

It is based on a non-original copy of source code recovered from old archive. Previously this code was published under GNU License so there is no problem to restore it in public.

Changes

  • Restore (write from scratch) match userspace library because it was lost during recovery.
  • Linux kernel version 4.19+ is supported.
  • Splitted global spinlock into different rw_locks and per-session spinlock. (Not tested, use on your own risk)

TODO

  • --The code is really full of global spinlocks and currently do not scale well on multi-CPU servers. I will try to rewrite it with a new lockless techniques in future.--
  • Rewrite session counters structure to simplify isg_tg.
  • A userspace daemon should be rewritten because perl is not fast enought in case of creating lots of new sessions per second.
  • IPv6 support is fully absent. I think that shoud be fixed.

Usage

Session initiation and shaping

Use iptables to setup rules in FORWARD chain to specify how to init session

iptables -A FORWARD -s 192.0.0.0/24 -j ISG --session-init
iptables -A FORWARD -d 192.0.0.0/24 -j ISG

This commands will advise ISG module to initiate session for every IP address from 192.0.0.0/24 network and to policy traffic to 192.0.0.0/24 network in case of active session

Redirect to authorization

iptables -t nat -A PREROUTING -p tcp -m tcp --dport 80 -m isg --service-name REDIRECT --j DNAT --to 192.0.0.1

This command will make DNAT for every HTTP packet that found in ISG with service REDIRECT. Possible usage to redirect to authorization web-site.

Additional documentation can be found by your favorite search engine

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lisg's Issues

Ubuntu 20.04 LTS don not compiles

root@leo:/opt/lisg/kernel# ./configure
Kernel version: 5.4.0-42-generic
Iptables binary version: 1.8.4 (legacy) (detected from /usr/sbin/iptables)
Searching for iptables-1.8.4 (legacy) sources..
Found iptables sources at /usr
Iptables module path: /usr/lib/debug/.dwz/x86_64-linux-gnu/iptables.debug (from binary)
Creating Makefile.. done.

Now run: 'make' and (if everything is fine) 'make install'

root@leo:/opt/lisg/kernel# make && make install
echo "" > build.h
printf "/* Compilation date.\n * Written by Makefile (userspace) */\n#define _BUILD_DATE "%s %s"\n" date +'%F %T' > build.h
make -C /lib/modules/5.4.0-42-generic/build M=/opt/lisg/kernel modules
make[1]: Entering directory '/usr/src/linux-headers-5.4.0-42-generic'
CC [M] /opt/lisg/kernel/isg_main.o
LD [M] /opt/lisg/kernel/ipt_ISG.o
Building modules, stage 2.
MODPOST 1 modules
CC [M] /opt/lisg/kernel/ipt_ISG.mod.o
LD [M] /opt/lisg/kernel/ipt_ISG.ko
make[1]: Leaving directory '/usr/src/linux-headers-5.4.0-42-generic'
gcc -O2 -Wall -Wunused -I/include -DIPTABLES_VERSION="1.8.4 (legacy)" -fPIC -o libipt_ISG_sh.o -c libipt_isg.c
/bin/sh: 1: Syntax error: "(" unexpected
make: *** [Makefile:17: all] Error 2

root@leo:/opt/lisg/kernel# lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 20.04 LTS
Release: 20.04
Codename: focal
root@leo:/opt/lisg/kernel#

Debian 11 не подключается к модулю

debian 11 5.10.0-23-amd64 #1 SMP Debian 5.10.179-1 (2023-05-12) x86_64 GNU/Linux5.10.179-1 (2023-05-12) x86_64 GNU/Linux
lsmod | grep ISG
ipt_ISG 28672 0
x_tables 53248 13 xt_conntrack,iptable_filter,xt_LOG,xt_state,ipt_NETFLOW,xt_nat,ipt_ISG,xt_set,ipt_REJECT,ip_tables,xt_limit,xt_connlimit,iptable_mangle
iptables v1.8.7 (legacy)

Модуль собрался - загрузился, но получаю такое
./ISG.pl
Incorrect packet length (196 bytes)
Recv from kernel: Interrupted system call
Unable to get sessions/services list: Interrupted system call

[Feature Request] Captive Portal

Hi!
I have a patch to web authorization (captive portal), but this patch not working on new versions, you can adapt this. Look here

--- sysoleg-lisg-1d05e525c870/ISG/bin/ISGd.pl	2014-03-23 18:18:29.000000000 +0600
+++ web_auth/ISG/bin/ISGd.pl	2015-12-29 22:28:35.000000000 +0500
@@ -58,9 +58,18 @@
 	my $sig = shift;
 	$dying = 1;
 
-	do_log("info", "Got signal $sig. Terminating all childs and finishing.");
+	do_log("info", "Got signal $sig. Terminating all children and finishing.");
 	unlink($cfg{pid_file});
 
+	if ($cfg{web_auth_enable})
+	{
+		do_log("info", "Cleaning the web_auth ipset table");
+		`ipset flush $cfg{web_auth_ipset_name} 2>/dev/null` ;
+	}
+	do_log("info", "Sending all children the KILL signal");
+	kill('KILL' => keys %child); # Let the workers do the cleanup
+	sleep(1);
+	do_log("info", "Sending all children the TERM signal");
 	my $count = kill('TERM' => keys %child);
 	exit(0);
 }
@@ -123,6 +132,7 @@
 
 &daemonize() if ($cfg{daemonize});
 
+init_web_auth() if ($cfg{web_auth_enable});
 $jobs{"ISG"}        = \&job_isg;
 $jobs{"CoA"}        = \&job_coa;
 $jobs{"TC_Refresh"} = \&job_reload_tc;
@@ -192,7 +202,7 @@
 					if ($ev->{'flags'} & ISG::IS_SERVICE && $ev->{'type'} == ISG::EVENT_SESS_START) {
 						do_log("info", "Service '" . $ev->{'service_name'} . "' for '$ipaddr' started");
 					} elsif ($ev->{'type'} == ISG::EVENT_SESS_STOP) {
-
+						web_auth("del", $ipaddr);
 						if ($ev->{'flags'} & ISG::IS_APPROVED_SESSION) {
 							make_new_child($cfg{cb_on_session_stop}, { "ipaddr" => $ipaddr, "nat_ipaddr" => $nat_ipaddr }) if defined($cfg{cb_on_session_stop});
 							do_log("info", "Session '$ipaddr' on 'Virtual" . $ev->{'port_number'} . "' finished");
@@ -200,6 +210,14 @@
 							do_log("info", "Service '" . $ev->{'service_name'} . "' for '$ipaddr' finished");
 						}
 					}
+					if ($ev->{'type'} == ISG::EVENT_SESS_START)
+					{
+						if ($ev->{'flags'} & ISG::IS_APPROVED_SESSION) {
+							web_auth("del", $ipaddr);
+						} else {
+							web_auth("add", $ipaddr);
+						}
+					}
 				}
 			} else {
 				my $src_host = $rsk->peerhost();
@@ -337,7 +355,7 @@
 					if (isg_send_event($sk, $oev) < 0) {
 						do_log("err", "Error sending EVENT_SESS_APPROVE: $!");
 					}
-
+					web_auth("del",$exp_login);
 					make_new_child($cfg{cb_on_session_start}, { "ipaddr" => $exp_login, "nat_ipaddr" => $nat_ipaddr }) if defined($cfg{cb_on_session_start});
 					do_log("info", "Session '$exp_login' on 'Virtual" . $exp_ev->{'port_number'} ."' accepted by '$src_host:$src_port'");
 
@@ -345,6 +363,7 @@
 					my $oev;
 
 					do_log("info", "Session '$exp_login' rejected by '$src_host:$src_port'");
+                                        web_auth("add",$exp_login);
 
 					$oev->{'type'} = ISG::EVENT_SESS_CHANGE;
 					$oev->{'port_number'} = $exp_ev->{'port_number'};
@@ -600,6 +619,10 @@
 			$out_err  = "Session-Context-Not-Found";
 		} else {
 			$out_code = $ack_code;
+			if ($rp->code eq "Disconnect-Request")
+			{
+				web_auth("del","$ev->{'ipaddr'}");
+			}
 		}
 
 send_rp:
@@ -1093,3 +1116,90 @@
 	$job->(defined($par) ? $par : 0);
 	exit;
 }
+
+sub web_auth {
+    my ($act, $local_ip) = @_;
+
+    return if ($act ne "add" && $act ne "del");
+    
+    if ($cfg{web_auth_enable})
+    {
+        `ipset $act $cfg{web_auth_ipset_name} $local_ip 2>/dev/null`;
+        if ($act eq "add")
+        {
+            do_log("info", "Adding $local_ip to web auth list");
+        }
+        else
+        {
+            do_log("info", "Removing $local_ip from web auth list");
+        }
+    }
+}
+
+sub init_web_auth {
+    `ipset create $cfg{web_auth_ipset_name} hash:ip`;
+    reload_web_auth();
+}
+
+sub reload_web_auth {
+    `ipset flush $cfg{web_auth_ipset_name} 2>/dev/null`;
+    my $sk = prepare_netlink_socket();
+    if ($sk < 0) {
+        do_log("err", "Unable to open netlink socket: $!");
+        exit(1);
+    }
+    my $data;
+    my %ev;
+	$ev->{'type'} = ISG::EVENT_SESS_GETLIST;
+
+    if (isg_send_event($sk, $ev) < 0) {
+        do_log("err", "Unable to get sessions list: $!");
+	    return;
+    }
+    
+    my $tot_msg_sz = ISG::NL_HDR_LEN + ISG::IN_EVENT_MSG_LEN;
+    my $stop = 0;
+    while (!$stop) {
+	    if (!(my $read_b = netlink_read($sk, \$data, 16384, 10))) {
+	        do_log("err", "Recv from kernel: $!");
+	        last;
+	    } else {
+	        if ($read_b < $tot_msg_sz) {
+	            do_log("err", "Packet too small ($read_b bytes)");
+		        next;
+	        }
+	        if ($read_b % $tot_msg_sz) {
+	            do_log("err", "Incorrect packet length ($read_b bytes)");
+		        next;
+	        }
+	        my $pkts_cnt = $read_b / $tot_msg_sz;
+
+	        for (my $i = 0; $i < $pkts_cnt; $i++) {
+		        my $offset = $i * $tot_msg_sz;
+
+		        $ev = isg_parse_event(substr($data, $offset, $tot_msg_sz));
+
+		        if ($ev->{'type'} == ISG::EVENT_SESS_INFO) {
+			        if ($ev->{'flags'}) 
+			        {
+	                    if (!($ev->{'flags'} & ISG::IS_SERVICE) && 
+	                        !($ev->{'flags'} & ISG::IS_APPROVED_SESSION)) 
+	                    {
+	                        web_auth("add",ISG::long2ip($ev->{'ipaddr'}));
+	                    }
+                    }
+                    else
+                    {
+                        web_auth("add",ISG::long2ip($ev->{'ipaddr'}))
+                            if (ISG::long2ip($ev->{'ipaddr'}) ne '0.0.0.0')
+                    }
+		        }
+
+		        if ($ev->{'nlhdr_type'} == ISG::NLMSG_DONE) {
+			        $stop = 1;
+  			    last;
+		        }
+		    }
+	    }
+	}
+}

Add support for IPv6 sessions

Is your feature request related to a problem? Please describe.
The module does not support IPv6, but this is good point of grow.

Describe the solution you'd like
The best solution would be to have dual-stack shaper to limit user speed in both address family at the same time.

Describe alternatives you've considered
There is no alternatives except specialized hardware BRAS.

[Feature Request] Authorize by Framed-IP-Address

Hi!
We are using Linux ISG from sysoleg.
We are using NETMAP rules for Full Cone NAT (NAT 1:1) - based on authorization packets in ISG and if RADIUS Attribute has != 0.0.0.0
$cfg{cb_on_session_start} = sub {
my $pars = shift;
my $ipaddr = $pars->{"ipaddr"};
my $nat_ipaddr = $pars->{"nat_ipaddr"};
if ($nat_ipaddr != '0.0.0.0'){
iptables -t nat -A binat_dst -d $nat_ipaddr/32 -j NETMAP --to $ipaddr;
iptables -t nat -A binat_src -s $ipaddr/32 -j NETMAP --to $nat_ipaddr;
ipset add smtp_pass $ipaddr -exist;
}
do_log("info", "Adding $ipaddr to ipset table fwd_allow\n");
ipset add fwd_allow $ipaddr -exist;
};
So, subscriber address has 192.168.0.1 address and NAT IP-address 167.80.45.50
In this case local subscriber can initiate session from LAN (by User-Name = 192.168.0.1), but session not will be authorized if other public service send a request to NAT IP-address 167.80.45.50 (because its not authorize packet by NAT IP-address(Framed-IP-Address)).
How can we add to Linux ISG authorization by Framed-IP-Address?

Add support for IPv4 network session

Describe the solution you'd like
Right now module can authorized and rate-limit only per IP-address session. Some clients want to use multiple IP addresses in one commit rate. For the first let's support networks as session identifier. (e.g. 10.10.10.0/28)

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