]>
git.proxmox.com Git - pve-firewall.git/blob - src/PVE/FirewallSimulator.pm
1 package PVE
::FirewallSimulator
;
16 my $NUMBER_RE = qr/0x[0-9a-fA-F]+|\d+/;
19 my $new_value = shift;
21 $debug = $new_value if defined($new_value);
44 $SIG{'__WARN__'} = sub {
53 my ($devre, $dev) = @_;
55 $devre =~ s/\+$/\.\*/;
56 return ($dev =~ m/^${devre}$/) ?
1 : 0;
60 my ($ipset_ruleset, $ipsetname, $ipaddr) = @_;
62 my $ipset = $ipset_ruleset->{$ipsetname};
63 die "no such ipset '$ipsetname'" if !$ipset;
65 my $ip = Net
::IP-
>new($ipaddr);
67 my $first = $ipset->[0];
68 if ($first =~ m/^create\s+\S+\s+list:/) {
69 foreach my $entry (@$ipset) {
70 next if $entry =~ m/^create/; # simply ignore
71 if ($entry =~ m/add \S+ (\S+)$/) {
72 return 1 if ipset_match
($ipset_ruleset, $1, $ipaddr);
78 } elsif ($first =~ m/^create\s+\S+\s+hash:net/) {
79 foreach my $entry (@$ipset) {
80 next if $entry =~ m/^create/; # simply ignore
81 if ($entry =~ m/add \S+ (\S+)$/) {
82 my $test = Net
::IP-
>new($1);
83 if ($test->overlaps($ip)) {
84 add_trace
("IPSET $ipsetname match $ipaddr\n");
93 die "unknown ipset type '$first' - not implemented\n";
100 my ($ipset_ruleset, $chain, $rule, $pkg) = @_;
102 $rule =~ s/^-A $chain // || die "got strange rule: $rule";
104 while (length($rule)) {
106 if ($rule =~ s/^-m conntrack --ctstate (\S+)\s*//) {
109 return undef if $cstate eq 'INVALID'; # no match
110 return undef if $cstate eq 'RELATED,ESTABLISHED'; # no match
112 next if $cstate =~ m/NEW/;
114 die "cstate test '$cstate' not implemented\n";
117 if ($rule =~ s/^-m addrtype --src-type (\S+)\s*//) {
119 die "missing source address type (srctype)\n"
121 return undef if $atype ne $pkg->{srctype
};
124 if ($rule =~ s/^-m addrtype --dst-type (\S+)\s*//) {
126 die "missing destination address type (dsttype)\n"
128 return undef if $atype ne $pkg->{dsttype
};
131 if ($rule =~ s/^-i (\S+)\s*//) {
133 die "missing interface (iface_in)\n" if !$pkg->{iface_in
};
134 return undef if !nf_dev_match
($devre, $pkg->{iface_in
});
138 if ($rule =~ s/^-o (\S+)\s*//) {
140 die "missing interface (iface_out)\n" if !$pkg->{iface_out
};
141 return undef if !nf_dev_match
($devre, $pkg->{iface_out
});
145 if ($rule =~ s/^-p (tcp|udp|igmp|icmp)\s*//) {
146 die "missing proto" if !$pkg->{proto
};
147 return undef if $pkg->{proto
} ne $1; # no match
151 if ($rule =~ s/^--dport (\d+):(\d+)\s*//) {
152 die "missing dport" if !$pkg->{dport
};
153 return undef if ($pkg->{dport
} < $1) || ($pkg->{dport
} > $2); # no match
157 if ($rule =~ s/^--dport (\d+)\s*//) {
158 die "missing dport" if !$pkg->{dport
};
159 return undef if $pkg->{dport
} != $1; # no match
163 if ($rule =~ s/^-s (\S+)\s*//) {
164 die "missing source" if !$pkg->{source
};
165 my $ip = Net
::IP-
>new($1);
166 return undef if !$ip->overlaps(Net
::IP-
>new($pkg->{source
})); # no match
170 if ($rule =~ s/^-d (\S+)\s*//) {
171 die "missing destination" if !$pkg->{dest
};
172 my $ip = Net
::IP-
>new($1);
173 return undef if !$ip->overlaps(Net
::IP-
>new($pkg->{dest
})); # no match
177 if ($rule =~ s/^-m set (!\s+)?--match-set (\S+) src\s*//) {
178 die "missing source" if !$pkg->{source
};
182 return undef if ipset_match
($ipset_ruleset, $ipset_name, $pkg->{source
});
184 return undef if !ipset_match
($ipset_ruleset, $ipset_name, $pkg->{source
});
189 if ($rule =~ s/^-m set --match-set (\S+) dst\s*//) {
190 die "missing destination" if !$pkg->{dest
};
192 return undef if !ipset_match
($ipset_ruleset, $ipset_name, $pkg->{dest
});
196 if ($rule =~ s/^-m mac ! --mac-source (\S+)\s*//) {
197 die "missing source mac" if !$pkg->{mac_source
};
198 return undef if $pkg->{mac_source
} eq $1; # no match
202 if ($rule =~ s/^-m physdev --physdev-is-bridged --physdev-in (\S+)\s*//) {
204 return undef if !$pkg->{physdev_in
};
205 return undef if !nf_dev_match
($devre, $pkg->{physdev_in
});
209 if ($rule =~ s/^-m physdev --physdev-is-bridged --physdev-out (\S+)\s*//) {
211 return undef if !$pkg->{physdev_out
};
212 return undef if !nf_dev_match
($devre, $pkg->{physdev_out
});
216 if ($rule =~ s
@^-m mark
--mark
($NUMBER_RE)(?
:/($NUMBER_RE))?\s
*@@) {
217 my ($value, $mask) = PVE
::Firewall
::get_mark_values
($1, $2);
218 return undef if !defined($mark) || ($mark & $mask) != $value;
224 if ($rule =~ s
@^-j MARK
--set-mark
($NUMBER_RE)(?
:/($NUMBER_RE))?\s
*$@@) {
225 my ($value, $mask) = PVE
::Firewall
::get_mark_values
($1, $2);
226 $mark = ($mark & ~$mask) | $value;
230 if ($rule =~ s/^-j (\S+)\s*$//) {
234 if ($rule =~ s/^-g (\S+)\s*$//) {
238 if ($rule =~ s/^-j NFLOG --nflog-prefix \"[^\"]+\"$//) {
245 die "unable to parse rule: $rule";
248 sub ruleset_simulate_chain
{
249 my ($ruleset, $ipset_ruleset, $chain, $pkg) = @_;
251 add_trace
("ENTER chain $chain\n");
255 if ($chain eq 'PVEFW-Drop') {
256 add_trace
("LEAVE chain $chain\n");
257 return ('DROP', $counter);
259 if ($chain eq 'PVEFW-reject') {
260 add_trace
("LEAVE chain $chain\n");
261 return ('REJECT', $counter);
264 if ($chain eq 'PVEFW-tcpflags') {
265 add_trace
("LEAVE chain $chain\n");
266 return (undef, $counter);
269 my $rules = $ruleset->{$chain} ||
270 die "no such chain '$chain'";
272 foreach my $rule (@$rules) {
274 my ($goto, $action) = rule_match
($ipset_ruleset, $chain, $rule, $pkg);
275 if (!defined($action)) {
276 add_trace
("SKIP: $rule\n");
279 add_trace
("MATCH: $rule\n");
281 if ($action eq 'ACCEPT' || $action eq 'DROP' || $action eq 'REJECT') {
282 add_trace
("TERMINATE chain $chain: $action\n");
283 return ($action, $counter);
284 } elsif ($action eq 'RETURN') {
285 add_trace
("RETURN FROM chain $chain\n");
289 add_trace
("LEAVE chain $chain - goto $action\n");
290 return ruleset_simulate_chain
($ruleset, $ipset_ruleset, $action, $pkg)
292 #$rules = $ruleset->{$chain} || die "no such chain '$chain'";
294 my ($act, $ctr) = ruleset_simulate_chain
($ruleset, $ipset_ruleset, $action, $pkg);
296 return ($act, $counter) if $act;
297 add_trace
("CONTINUE chain $chain\n");
302 add_trace
("LEAVE chain $chain\n");
303 if ($chain =~ m/^PVEFW-(INPUT|OUTPUT|FORWARD)$/) {
304 return ('ACCEPT', $counter); # default policy
307 return (undef, $counter);
315 while (my ($k,$v) = each %$pkg) {
322 # Try to simulate packet traversal inside kernel. This invokes iptable
323 # checks several times.
325 my ($ruleset, $ipset_ruleset, $pkg, $from_info, $target, $start_state) = @_;
327 $pkg->{ipversion
} = 4; # fixme: allow ipv6
329 my $route_state = $start_state;
333 my $ipt_invocation_counter = 0;
334 my $rule_check_counter = 0;
336 while ($route_state ne $target->{iface
}) {
339 my $next_route_state;
342 $pkg->{iface_in
} = $pkg->{iface_out
} = undef;
343 $pkg->{physdev_in
} = $pkg->{physdev_out
} = undef;
345 if ($route_state eq 'from-bport') {
346 $next_route_state = $from_info->{bridge
} || die 'internal error';
347 $next_physdev_in = $from_info->{iface
} || die 'internal error';
348 } elsif ($route_state eq 'host') {
350 if ($target->{type
} eq 'bport') {
351 $pkg->{iface_in
} = 'lo';
352 $pkg->{iface_out
} = $target->{bridge
} || die 'internal error';
353 $chain = 'PVEFW-OUTPUT';
354 $next_route_state = $target->{iface
} || die 'internal error';
355 } elsif ($target->{type
} eq 'vm' || $target->{type
} eq 'ct') {
356 $pkg->{iface_in
} = 'lo';
357 $pkg->{iface_out
} = $target->{bridge
} || die 'internal error';
358 $chain = 'PVEFW-OUTPUT';
359 $next_route_state = 'fwbr-in';
364 } elsif ($route_state eq 'fwbr-out') {
366 $chain = 'PVEFW-FORWARD';
367 $next_route_state = $from_info->{bridge
} || die 'internal error';
368 $next_physdev_in = $from_info->{fwpr
} || die 'internal error';
369 $pkg->{iface_in
} = $from_info->{fwbr
} || die 'internal error';
370 $pkg->{iface_out
} = $from_info->{fwbr
} || die 'internal error';
371 $pkg->{physdev_in
} = $from_info->{tapdev
} || die 'internal error';
372 $pkg->{physdev_out
} = $from_info->{fwln
} || die 'internal error';
374 } elsif ($route_state eq 'fwbr-in') {
376 $chain = 'PVEFW-FORWARD';
377 $next_route_state = $target->{tapdev
};
378 $pkg->{iface_in
} = $target->{fwbr
} || die 'internal error';
379 $pkg->{iface_out
} = $target->{fwbr
} || die 'internal error';
380 $pkg->{physdev_in
} = $target->{fwln
} || die 'internal error';
381 $pkg->{physdev_out
} = $target->{tapdev
} || die 'internal error';
383 } elsif ($route_state =~ m/^vmbr\d+$/) {
385 die "missing physdev_in - internal error?" if !$physdev_in;
386 $pkg->{physdev_in
} = $physdev_in;
388 if ($target->{type
} eq 'host') {
390 $chain = 'PVEFW-INPUT';
391 $pkg->{iface_in
} = $route_state;
392 $pkg->{iface_out
} = 'lo';
393 $next_route_state = 'host';
395 } elsif ($target->{type
} eq 'bport') {
397 $chain = 'PVEFW-FORWARD';
398 $pkg->{iface_in
} = $route_state;
399 $pkg->{iface_out
} = $target->{bridge
} || die 'internal error';
400 # conditionally set physdev_out (same behavior as kernel)
401 if ($route_state eq $target->{bridge
}) {
402 $pkg->{physdev_out
} = $target->{iface
} || die 'internal error';
404 $next_route_state = $target->{iface
};
406 } elsif ($target->{type
} eq 'vm' || $target->{type
} eq 'ct') {
408 $chain = 'PVEFW-FORWARD';
409 $pkg->{iface_in
} = $route_state;
410 $pkg->{iface_out
} = $target->{bridge
};
411 # conditionally set physdev_out (same behavior as kernel)
412 if ($route_state eq $target->{bridge
}) {
413 $pkg->{physdev_out
} = $target->{fwpr
} || die 'internal error';
415 $next_route_state = 'fwbr-in';
422 die "implement me $route_state";
425 die "internal error" if !defined($next_route_state);
428 add_trace
("IPT check at $route_state (chain $chain)\n");
429 add_trace
(Dumper
($pkg));
430 $ipt_invocation_counter++;
431 my ($res, $ctr) = ruleset_simulate_chain
($ruleset, $ipset_ruleset, $chain, $pkg);
432 $rule_check_counter += $ctr;
433 return ($res, $ipt_invocation_counter, $rule_check_counter) if $res ne 'ACCEPT';
436 $route_state = $next_route_state;
438 $physdev_in = $next_physdev_in;
441 return ('ACCEPT', $ipt_invocation_counter, $rule_check_counter);
444 sub extract_ct_info
{
445 my ($vmdata, $vmid, $netnum) = @_;
447 my $info = { type
=> 'ct', vmid
=> $vmid };
449 my $conf = $vmdata->{lxc
}->{$vmid} || die "no such CT '$vmid'";
450 my $net = PVE
::LXC
::Config-
>parse_lxc_network($conf->{"net$netnum"});
451 $info->{macaddr
} = $net->{hwaddr
} || die "unable to get mac address";
452 $info->{bridge
} = $net->{bridge
} || die "unable to get bridge";
453 $info->{fwbr
} = "fwbr${vmid}i$netnum";
454 $info->{tapdev
} = "veth${vmid}i$netnum";
455 $info->{fwln
} = "fwln${vmid}i$netnum";
456 $info->{fwpr
} = "fwpr${vmid}p$netnum";
457 $info->{ip_address
} = $net->{ip
} || die "unable to get ip address";
462 sub extract_vm_info
{
463 my ($vmdata, $vmid, $netnum) = @_;
465 my $info = { type
=> 'vm', vmid
=> $vmid };
467 my $conf = $vmdata->{qemu
}->{$vmid} || die "no such VM '$vmid'";
468 my $net = PVE
::QemuServer
::parse_net
($conf->{"net$netnum"});
469 $info->{macaddr
} = $net->{macaddr
} || die "unable to get mac address";
470 $info->{bridge
} = $net->{bridge
} || die "unable to get bridge";
471 $info->{fwbr
} = "fwbr${vmid}i$netnum";
472 $info->{tapdev
} = "tap${vmid}i$netnum";
473 $info->{fwln
} = "fwln${vmid}i$netnum";
474 $info->{fwpr
} = "fwpr${vmid}p$netnum";
479 sub simulate_firewall
{
480 my ($ruleset, $ipset_ruleset, $host_ip, $vmdata, $test) = @_;
482 my $from = $test->{from
} || die "missing 'from' field";
483 my $to = $test->{to
} || die "missing 'to' field";
484 my $action = $test->{action
} || die "missing 'action'";
486 my $testid = $test->{id
};
488 die "from/to needs to be different" if $from eq $to;
496 srctype
=> 'UNICAST',
497 dsttype
=> 'UNICAST',
500 while (my ($k,$v) = each %$test) {
501 next if $k eq 'from';
503 next if $k eq 'action';
505 die "unknown attribute '$k'\n" if !exists($pkg->{$k});
513 if ($from eq 'host') {
514 $from_info->{type
} = 'host';
515 $start_state = 'host';
516 $pkg->{source
} = $host_ip if !defined($pkg->{source
});
517 } elsif ($from =~ m
|^(vmbr\d
+)/(\S
+)$|) {
518 $from_info->{type
} = 'bport';
519 $from_info->{bridge
} = $1;
520 $from_info->{iface
} = $2;
521 $start_state = 'from-bport';
522 } elsif ($from eq 'outside') {
523 $from_info->{type
} = 'bport';
524 $from_info->{bridge
} = 'vmbr0';
525 $from_info->{iface
} = 'eth0';
526 $start_state = 'from-bport';
527 } elsif ($from eq 'nfvm') {
528 $from_info->{type
} = 'bport';
529 $from_info->{bridge
} = 'vmbr0';
530 $from_info->{iface
} = 'tapXYZ';
531 $start_state = 'from-bport';
532 } elsif ($from =~ m/^ct(\d+)$/) {
534 $from_info = extract_ct_info
($vmdata, $vmid, 0);
535 $start_state = 'fwbr-out';
536 $pkg->{mac_source
} = $from_info->{macaddr
};
537 } elsif ($from =~ m/^vm(\d+)(i(\d))?$/) {
539 my $netnum = $3 || 0;
540 $from_info = extract_vm_info
($vmdata, $vmid, $netnum);
541 $start_state = 'fwbr-out';
542 $pkg->{mac_source
} = $from_info->{macaddr
};
544 die "unable to parse \"from => '$from'\"\n";
550 $target->{type
} = 'host';
551 $target->{iface
} = 'host';
552 $pkg->{dest
} = $host_ip if !defined($pkg->{dest
});
553 } elsif ($to =~ m
|^(vmbr\d
+)/(\S
+)$|) {
554 $target->{type
} = 'bport';
555 $target->{bridge
} = $1;
556 $target->{iface
} = $2;
557 } elsif ($to eq 'outside') {
558 $target->{type
} = 'bport';
559 $target->{bridge
} = 'vmbr0';
560 $target->{iface
} = 'eth0';
561 } elsif ($to eq 'nfvm') {
562 $target->{type
} = 'bport';
563 $target->{bridge
} = 'vmbr0';
564 $target->{iface
} = 'tapXYZ';
565 } elsif ($to =~ m/^ct(\d+)$/) {
567 $target = extract_ct_info
($vmdata, $vmid, 0);
568 $target->{iface
} = $target->{tapdev
};
569 } elsif ($to =~ m/^vm(\d+)$/) {
571 $target = extract_vm_info
($vmdata, $vmid, 0);
572 $target->{iface
} = $target->{tapdev
};
574 die "unable to parse \"to => '$to'\"\n";
577 $pkg->{source
} = '100.100.1.2' if !defined($pkg->{source
});
578 $pkg->{dest
} = '100.200.3.4' if !defined($pkg->{dest
});
580 my ($res, $ic, $rc) = route_packet
($ruleset, $ipset_ruleset, $pkg,
581 $from_info, $target, $start_state);
583 add_trace
("IPT statistics: invocation = $ic, checks = $rc\n");
585 return $res if $action eq 'QUERY';
587 die "test failed ($res != $action)\n" if $action ne $res;