]>
git.proxmox.com Git - pve-firewall.git/blob - src/PVE/FirewallSimulator.pm
1 package PVE
::FirewallSimulator
;
15 my $new_value = shift;
17 $debug = $new_value if defined($new_value);
40 $SIG{'__WARN__'} = sub {
49 my ($devre, $dev) = @_;
51 $devre =~ s/\+$/\.\*/;
52 return ($dev =~ m/^${devre}$/) ?
1 : 0;
56 my ($ipsetname, $ipset, $ipaddr) = @_;
58 my $ip = Net
::IP-
>new($ipaddr);
60 foreach my $entry (@$ipset) {
61 next if $entry =~ m/^create/; # simply ignore
62 if ($entry =~ m/add \S+ (\S+)$/) {
63 my $test = Net
::IP-
>new($1);
64 if ($test->overlaps($ip)) {
65 add_trace
("IPSET $ipsetname match $ipaddr\n");
77 my ($ipset_ruleset, $chain, $rule, $pkg) = @_;
79 $rule =~ s/^-A $chain // || die "got strange rule: $rule";
81 while (length($rule)) {
83 if ($rule =~ s/^-m conntrack --ctstate (\S+)\s*//) {
86 return undef if $cstate eq 'INVALID'; # no match
87 return undef if $cstate eq 'RELATED,ESTABLISHED'; # no match
89 next if $cstate =~ m/NEW/;
91 die "cstate test '$cstate' not implemented\n";
94 if ($rule =~ s/^-m addrtype --src-type (\S+)\s*//) {
96 die "missing source address type (srctype)\n"
98 return undef if $atype ne $pkg->{srctype
};
101 if ($rule =~ s/^-m addrtype --dst-type (\S+)\s*//) {
103 die "missing destination address type (dsttype)\n"
105 return undef if $atype ne $pkg->{dsttype
};
108 if ($rule =~ s/^-i (\S+)\s*//) {
110 die "missing interface (iface_in)\n" if !$pkg->{iface_in
};
111 return undef if !nf_dev_match
($devre, $pkg->{iface_in
});
115 if ($rule =~ s/^-o (\S+)\s*//) {
117 die "missing interface (iface_out)\n" if !$pkg->{iface_out
};
118 return undef if !nf_dev_match
($devre, $pkg->{iface_out
});
122 if ($rule =~ s/^-p (tcp|udp|igmp|icmp)\s*//) {
123 die "missing proto" if !$pkg->{proto
};
124 return undef if $pkg->{proto
} ne $1; # no match
128 if ($rule =~ s/^--dport (\d+):(\d+)\s*//) {
129 die "missing dport" if !$pkg->{dport
};
130 return undef if ($pkg->{dport
} < $1) || ($pkg->{dport
} > $2); # no match
134 if ($rule =~ s/^--dport (\d+)\s*//) {
135 die "missing dport" if !$pkg->{dport
};
136 return undef if $pkg->{dport
} != $1; # no match
140 if ($rule =~ s/^-s (\S+)\s*//) {
141 die "missing source" if !$pkg->{source
};
142 my $ip = Net
::IP-
>new($1);
143 return undef if !$ip->overlaps(Net
::IP-
>new($pkg->{source
})); # no match
147 if ($rule =~ s/^-d (\S+)\s*//) {
148 die "missing destination" if !$pkg->{dest
};
149 my $ip = Net
::IP-
>new($1);
150 return undef if !$ip->overlaps(Net
::IP-
>new($pkg->{dest
})); # no match
154 if ($rule =~ s/^-m set (!\s+)?--match-set (\S+) src\s*//) {
155 die "missing source" if !$pkg->{source
};
157 my $ipset = $ipset_ruleset->{$2};
158 die "no such ip set '$2'" if !$ipset;
160 return undef if ipset_match
($1, $ipset, $pkg->{source
});
162 return undef if !ipset_match
($1, $ipset, $pkg->{source
});
167 if ($rule =~ s/^-m set --match-set (\S+) dst\s*//) {
168 die "missing destination" if !$pkg->{dest
};
169 my $ipset = $ipset_ruleset->{$1};
170 die "no such ip set '$1'" if !$ipset;
171 return undef if !ipset_match
($1, $ipset, $pkg->{dest
});
175 if ($rule =~ s/^-m mac ! --mac-source (\S+)\s*//) {
176 die "missing source mac" if !$pkg->{mac_source
};
177 return undef if $pkg->{mac_source
} eq $1; # no match
181 if ($rule =~ s/^-m physdev --physdev-is-bridged --physdev-in (\S+)\s*//) {
183 return undef if !$pkg->{physdev_in
};
184 return undef if !nf_dev_match
($devre, $pkg->{physdev_in
});
188 if ($rule =~ s/^-m physdev --physdev-is-bridged --physdev-out (\S+)\s*//) {
190 return undef if !$pkg->{physdev_out
};
191 return undef if !nf_dev_match
($devre, $pkg->{physdev_out
});
195 if ($rule =~ s/^-m mark --mark (\d+)\s*//) {
196 return undef if !defined($mark) || $mark != $1;
202 if ($rule =~ s/^-j MARK --set-mark (\d+)\s*$//) {
207 if ($rule =~ s/^-j (\S+)\s*$//) {
211 if ($rule =~ s/^-g (\S+)\s*$//) {
215 if ($rule =~ s/^-j NFLOG --nflog-prefix \"[^\"]+\"$//) {
222 die "unable to parse rule: $rule";
225 sub ruleset_simulate_chain
{
226 my ($ruleset, $ipset_ruleset, $chain, $pkg) = @_;
228 add_trace
("ENTER chain $chain\n");
232 if ($chain eq 'PVEFW-Drop') {
233 add_trace
("LEAVE chain $chain\n");
234 return ('DROP', $counter);
236 if ($chain eq 'PVEFW-reject') {
237 add_trace
("LEAVE chain $chain\n");
238 return ('REJECT', $counter);
241 if ($chain eq 'PVEFW-tcpflags') {
242 add_trace
("LEAVE chain $chain\n");
243 return (undef, $counter);
246 my $rules = $ruleset->{$chain} ||
247 die "no such chain '$chain'";
249 foreach my $rule (@$rules) {
251 my ($goto, $action) = rule_match
($ipset_ruleset, $chain, $rule, $pkg);
252 if (!defined($action)) {
253 add_trace
("SKIP: $rule\n");
256 add_trace
("MATCH: $rule\n");
258 if ($action eq 'ACCEPT' || $action eq 'DROP' || $action eq 'REJECT') {
259 add_trace
("TERMINATE chain $chain: $action\n");
260 return ($action, $counter);
261 } elsif ($action eq 'RETURN') {
262 add_trace
("RETURN FROM chain $chain\n");
266 add_trace
("LEAVE chain $chain - goto $action\n");
267 return ruleset_simulate_chain
($ruleset, $ipset_ruleset, $action, $pkg)
269 #$rules = $ruleset->{$chain} || die "no such chain '$chain'";
271 my ($act, $ctr) = ruleset_simulate_chain
($ruleset, $ipset_ruleset, $action, $pkg);
273 return ($act, $counter) if $act;
274 add_trace
("CONTINUE chain $chain\n");
279 add_trace
("LEAVE chain $chain\n");
280 if ($chain =~ m/^PVEFW-(INPUT|OUTPUT|FORWARD)$/) {
281 return ('ACCEPT', $counter); # default policy
284 return (undef, $counter);
292 while (my ($k,$v) = each %$pkg) {
299 # Try to simulate packet traversal inside kernel. This invokes iptable
300 # checks several times.
302 my ($ruleset, $ipset_ruleset, $pkg, $from_info, $target, $start_state) = @_;
304 my $route_state = $start_state;
308 my $ipt_invocation_counter = 0;
309 my $rule_check_counter = 0;
311 while ($route_state ne $target->{iface
}) {
314 my $next_route_state;
317 $pkg->{iface_in
} = $pkg->{iface_out
} = undef;
318 $pkg->{physdev_in
} = $pkg->{physdev_out
} = undef;
320 if ($route_state eq 'from-bport') {
321 $next_route_state = $from_info->{bridge
} || die 'internal error';
322 $next_physdev_in = $from_info->{iface
} || die 'internal error';
323 } elsif ($route_state eq 'host') {
325 if ($target->{type
} eq 'bport') {
326 $pkg->{iface_in
} = 'lo';
327 $pkg->{iface_out
} = $target->{bridge
} || die 'internal error';
328 $chain = 'PVEFW-OUTPUT';
329 $next_route_state = $target->{iface
} || die 'internal error';
330 } elsif ($target->{type
} eq 'ct') {
331 $pkg->{iface_in
} = 'lo';
332 $pkg->{iface_out
} = 'venet0';
333 $chain = 'PVEFW-OUTPUT';
334 $next_route_state = 'venet-in';
335 } elsif ($target->{type
} eq 'vm') {
336 $pkg->{iface_in
} = 'lo';
337 $pkg->{iface_out
} = $target->{bridge
} || die 'internal error';
338 $chain = 'PVEFW-OUTPUT';
339 $next_route_state = 'fwbr-in';
344 } elsif ($route_state eq 'venet-out') {
346 if ($target->{type
} eq 'host') {
348 $chain = 'PVEFW-INPUT';
349 $pkg->{iface_in
} = 'venet0';
350 $pkg->{iface_out
} = 'lo';
351 $next_route_state = 'host';
353 } elsif ($target->{type
} eq 'bport') {
355 $chain = 'PVEFW-FORWARD';
356 $pkg->{iface_in
} = 'venet0';
357 $pkg->{iface_out
} = $target->{bridge
} || die 'internal error';
358 $next_route_state = $target->{iface
} || die 'internal error';
360 } elsif ($target->{type
} eq 'vm') {
362 $chain = 'PVEFW-FORWARD';
363 $pkg->{iface_in
} = 'venet0';
364 $pkg->{iface_out
} = $target->{bridge
} || die 'internal error';
365 $next_route_state = 'fwbr-in';
367 } elsif ($target->{type
} eq 'ct') {
369 $chain = 'PVEFW-FORWARD';
370 $pkg->{iface_in
} = 'venet0';
371 $pkg->{iface_out
} = 'venet0';
372 $next_route_state = 'venet-in';
378 } elsif ($route_state eq 'fwbr-out') {
380 $chain = 'PVEFW-FORWARD';
381 $next_route_state = $from_info->{bridge
} || die 'internal error';
382 $next_physdev_in = $from_info->{fwpr
} || die 'internal error';
383 $pkg->{iface_in
} = $from_info->{fwbr
} || die 'internal error';
384 $pkg->{iface_out
} = $from_info->{fwbr
} || die 'internal error';
385 $pkg->{physdev_in
} = $from_info->{tapdev
} || die 'internal error';
386 $pkg->{physdev_out
} = $from_info->{fwln
} || die 'internal error';
388 } elsif ($route_state eq 'fwbr-in') {
390 $chain = 'PVEFW-FORWARD';
391 $next_route_state = $target->{tapdev
};
392 $pkg->{iface_in
} = $target->{fwbr
} || die 'internal error';
393 $pkg->{iface_out
} = $target->{fwbr
} || die 'internal error';
394 $pkg->{physdev_in
} = $target->{fwln
} || die 'internal error';
395 $pkg->{physdev_out
} = $target->{tapdev
} || die 'internal error';
397 } elsif ($route_state =~ m/^vmbr\d+$/) {
399 die "missing physdev_in - internal error?" if !$physdev_in;
400 $pkg->{physdev_in
} = $physdev_in;
402 if ($target->{type
} eq 'host') {
404 $chain = 'PVEFW-INPUT';
405 $pkg->{iface_in
} = $route_state;
406 $pkg->{iface_out
} = 'lo';
407 $next_route_state = 'host';
409 } elsif ($target->{type
} eq 'bport') {
411 $chain = 'PVEFW-FORWARD';
412 $pkg->{iface_in
} = $route_state;
413 $pkg->{iface_out
} = $target->{bridge
} || die 'internal error';
414 # conditionally set physdev_out (same behavior as kernel)
415 if ($route_state eq $target->{bridge
}) {
416 $pkg->{physdev_out
} = $target->{iface
} || die 'internal error';
418 $next_route_state = $target->{iface
};
420 } elsif ($target->{type
} eq 'ct') {
422 $chain = 'PVEFW-FORWARD';
423 $pkg->{iface_in
} = $route_state;
424 $pkg->{iface_out
} = 'venet0';
425 $next_route_state = 'venet-in';
427 } elsif ($target->{type
} eq 'vm') {
429 $chain = 'PVEFW-FORWARD';
430 $pkg->{iface_in
} = $route_state;
431 $pkg->{iface_out
} = $target->{bridge
};
432 # conditionally set physdev_out (same behavior as kernel)
433 if ($route_state eq $target->{bridge
}) {
434 $pkg->{physdev_out
} = $target->{fwpr
} || die 'internal error';
436 $next_route_state = 'fwbr-in';
443 die "implement me $route_state";
446 die "internal error" if !defined($next_route_state);
449 add_trace
("IPT check at $route_state (chain $chain)\n");
450 add_trace
(Dumper
($pkg));
451 $ipt_invocation_counter++;
452 my ($res, $ctr) = ruleset_simulate_chain
($ruleset, $ipset_ruleset, $chain, $pkg);
453 $rule_check_counter += $ctr;
454 return ($res, $ipt_invocation_counter, $rule_check_counter) if $res ne 'ACCEPT';
457 $route_state = $next_route_state;
459 $physdev_in = $next_physdev_in;
462 return ('ACCEPT', $ipt_invocation_counter, $rule_check_counter);
465 sub extract_ct_info
{
466 my ($vmdata, $vmid) = @_;
468 my $info = { type
=> 'ct', vmid
=> $vmid };
470 my $conf = $vmdata->{openvz
}->{$vmid} || die "no such CT '$vmid'";
471 if ($conf->{ip_address
}) {
472 $info->{ip_address
} = $conf->{ip_address
}->{value
};
479 sub extract_vm_info
{
480 my ($vmdata, $vmid, $netnum) = @_;
482 my $info = { type
=> 'vm', vmid
=> $vmid };
484 my $conf = $vmdata->{qemu
}->{$vmid} || die "no such VM '$vmid'";
485 my $net = PVE
::QemuServer
::parse_net
($conf->{"net$netnum"});
486 $info->{macaddr
} = $net->{macaddr
} || die "unable to get mac address";
487 $info->{bridge
} = $net->{bridge
} || die "unable to get bridge";
488 $info->{fwbr
} = "fwbr${vmid}i$netnum";
489 $info->{tapdev
} = "tap${vmid}i$netnum";
490 $info->{fwln
} = "fwln${vmid}i$netnum";
491 $info->{fwpr
} = "fwpr${vmid}p$netnum";
496 sub simulate_firewall
{
497 my ($ruleset, $ipset_ruleset, $host_ip, $vmdata, $test) = @_;
499 my $from = $test->{from
} || die "missing 'from' field";
500 my $to = $test->{to
} || die "missing 'to' field";
501 my $action = $test->{action
} || die "missing 'action'";
503 my $testid = $test->{id
};
505 die "from/to needs to be different" if $from eq $to;
513 srctype
=> 'UNICAST',
514 dsttype
=> 'UNICAST',
517 while (my ($k,$v) = each %$test) {
518 next if $k eq 'from';
520 next if $k eq 'action';
522 die "unknown attribute '$k'\n" if !exists($pkg->{$k});
530 if ($from eq 'host') {
531 $from_info->{type
} = 'host';
532 $start_state = 'host';
533 $pkg->{source
} = $host_ip if !defined($pkg->{source
});
534 } elsif ($from =~ m
|^(vmbr\d
+)/(\S
+)$|) {
535 $from_info->{type
} = 'bport';
536 $from_info->{bridge
} = $1;
537 $from_info->{iface
} = $2;
538 $start_state = 'from-bport';
539 } elsif ($from eq 'outside') {
540 $from_info->{type
} = 'bport';
541 $from_info->{bridge
} = 'vmbr0';
542 $from_info->{iface
} = 'eth0';
543 $start_state = 'from-bport';
544 } elsif ($from eq 'nfvm') {
545 $from_info->{type
} = 'bport';
546 $from_info->{bridge
} = 'vmbr0';
547 $from_info->{iface
} = 'tapXYZ';
548 $start_state = 'from-bport';
549 } elsif ($from =~ m/^ct(\d+)$/) {
551 $from_info = extract_ct_info
($vmdata, $vmid);
552 if ($from_info->{ip_address
}) {
553 $pkg->{source
} = $from_info->{ip_address
} if !defined($pkg->{source
});
554 $start_state = 'venet-out';
558 } elsif ($from =~ m/^vm(\d+)(i(\d))?$/) {
560 my $netnum = $3 || 0;
561 $from_info = extract_vm_info
($vmdata, $vmid, $netnum);
562 $start_state = 'fwbr-out';
563 $pkg->{mac_source
} = $from_info->{macaddr
};
565 die "unable to parse \"from => '$from'\"\n";
571 $target->{type
} = 'host';
572 $target->{iface
} = 'host';
573 $pkg->{dest
} = $host_ip if !defined($pkg->{dest
});
574 } elsif ($to =~ m
|^(vmbr\d
+)/(\S
+)$|) {
575 $target->{type
} = 'bport';
576 $target->{bridge
} = $1;
577 $target->{iface
} = $2;
578 } elsif ($to eq 'outside') {
579 $target->{type
} = 'bport';
580 $target->{bridge
} = 'vmbr0';
581 $target->{iface
} = 'eth0';
582 } elsif ($to eq 'nfvm') {
583 $target->{type
} = 'bport';
584 $target->{bridge
} = 'vmbr0';
585 $target->{iface
} = 'tapXYZ';
586 } elsif ($to =~ m/^ct(\d+)$/) {
588 $target = extract_ct_info
($vmdata, $vmid);
589 $target->{iface
} = 'venet-in';
591 if ($target->{ip_address
}) {
592 $pkg->{dest
} = $target->{ip_address
};
596 } elsif ($to =~ m/^vm(\d+)$/) {
598 $target = extract_vm_info
($vmdata, $vmid, 0);
599 $target->{iface
} = $target->{tapdev
};
601 die "unable to parse \"to => '$to'\"\n";
604 $pkg->{source
} = '100.100.1.2' if !defined($pkg->{source
});
605 $pkg->{dest
} = '100.200.3.4' if !defined($pkg->{dest
});
607 my ($res, $ic, $rc) = route_packet
($ruleset, $ipset_ruleset, $pkg,
608 $from_info, $target, $start_state);
610 add_trace
("IPT statistics: invocation = $ic, checks = $rc\n");
612 return $res if $action eq 'QUERY';
614 die "test failed ($res != $action)\n" if $action ne $res;