]>
git.proxmox.com Git - pve-firewall.git/blob - src/PVE/FirewallSimulator.pm
1 package PVE
::FirewallSimulator
;
10 # dynamically include PVE::QemuServer and PVE::LXC
11 # to avoid dependency problems
14 require PVE
::QemuServer
;
15 $have_qemu_server = 1;
28 my $NUMBER_RE = qr/0x[0-9a-fA-F]+|\d+/;
31 my $new_value = shift;
33 $debug = $new_value if defined($new_value);
56 $SIG{'__WARN__'} = sub {
65 my ($devre, $dev) = @_;
67 $devre =~ s/\+$/\.\*/;
68 return ($dev =~ m/^${devre}$/) ?
1 : 0;
72 my ($ipset_ruleset, $ipsetname, $ipaddr) = @_;
74 my $ipset = $ipset_ruleset->{$ipsetname};
75 die "no such ipset '$ipsetname'" if !$ipset;
77 my $ip = Net
::IP-
>new($ipaddr);
79 my $first = $ipset->[0];
80 if ($first =~ m/^create\s+\S+\s+list:/) {
81 foreach my $entry (@$ipset) {
82 next if $entry =~ m/^create/; # simply ignore
83 if ($entry =~ m/add \S+ (\S+)$/) {
84 return 1 if ipset_match
($ipset_ruleset, $1, $ipaddr);
90 } elsif ($first =~ m/^create\s+\S+\s+hash:net/) {
91 foreach my $entry (@$ipset) {
92 next if $entry =~ m/^create/; # simply ignore
93 if ($entry =~ m/add \S+ (\S+)$/) {
94 my $test = Net
::IP-
>new($1);
95 if ($test->overlaps($ip)) {
96 add_trace
("IPSET $ipsetname match $ipaddr\n");
105 die "unknown ipset type '$first' - not implemented\n";
112 my ($ipset_ruleset, $chain, $rule, $pkg) = @_;
114 $rule =~ s/^-A $chain +// || die "got strange rule: $rule";
116 while (length($rule)) {
118 if ($rule =~ s/^-m conntrack --ctstate (\S+)\s*//) {
121 return undef if $cstate eq 'INVALID'; # no match
122 return undef if $cstate eq 'RELATED,ESTABLISHED'; # no match
124 next if $cstate =~ m/NEW/;
126 die "cstate test '$cstate' not implemented\n";
129 if ($rule =~ s/^-m addrtype --src-type (\S+)\s*//) {
131 die "missing source address type (srctype)\n"
133 return undef if $atype ne $pkg->{srctype
};
136 if ($rule =~ s/^-m addrtype --dst-type (\S+)\s*//) {
138 die "missing destination address type (dsttype)\n"
140 return undef if $atype ne $pkg->{dsttype
};
143 if ($rule =~ s/^-i (\S+)\s*//) {
145 die "missing interface (iface_in)\n" if !$pkg->{iface_in
};
146 return undef if !nf_dev_match
($devre, $pkg->{iface_in
});
150 if ($rule =~ s/^-o (\S+)\s*//) {
152 die "missing interface (iface_out)\n" if !$pkg->{iface_out
};
153 return undef if !nf_dev_match
($devre, $pkg->{iface_out
});
157 if ($rule =~ s/^-p (tcp|udp|igmp|icmp)\s*//) {
158 die "missing proto" if !$pkg->{proto
};
159 return undef if $pkg->{proto
} ne $1; # no match
163 if ($rule =~ s/^--dport (\d+):(\d+)\s*//) {
164 die "missing dport" if !$pkg->{dport
};
165 return undef if ($pkg->{dport
} < $1) || ($pkg->{dport
} > $2); # no match
169 if ($rule =~ s/^--dport (\d+)\s*//) {
170 die "missing dport" if !$pkg->{dport
};
171 return undef if $pkg->{dport
} != $1; # no match
175 if ($rule =~ s/^-s (\S+)\s*//) {
176 die "missing source" if !$pkg->{source
};
177 my $ip = Net
::IP-
>new($1);
178 return undef if !$ip->overlaps(Net
::IP-
>new($pkg->{source
})); # no match
182 if ($rule =~ s/^-d (\S+)\s*//) {
183 die "missing destination" if !$pkg->{dest
};
184 my $ip = Net
::IP-
>new($1);
185 return undef if !$ip->overlaps(Net
::IP-
>new($pkg->{dest
})); # no match
189 if ($rule =~ s/^-m set (!\s+)?--match-set (\S+) src\s*//) {
190 die "missing source" if !$pkg->{source
};
194 return undef if ipset_match
($ipset_ruleset, $ipset_name, $pkg->{source
});
196 return undef if !ipset_match
($ipset_ruleset, $ipset_name, $pkg->{source
});
201 if ($rule =~ s/^-m set --match-set (\S+) dst\s*//) {
202 die "missing destination" if !$pkg->{dest
};
204 return undef if !ipset_match
($ipset_ruleset, $ipset_name, $pkg->{dest
});
208 if ($rule =~ s/^-m mac ! --mac-source (\S+)\s*//) {
209 die "missing source mac" if !$pkg->{mac_source
};
210 return undef if $pkg->{mac_source
} eq $1; # no match
214 if ($rule =~ s/^-m physdev --physdev-is-bridged --physdev-in (\S+)\s*//) {
216 return undef if !$pkg->{physdev_in
};
217 return undef if !nf_dev_match
($devre, $pkg->{physdev_in
});
221 if ($rule =~ s/^-m physdev --physdev-is-bridged --physdev-out (\S+)\s*//) {
223 return undef if !$pkg->{physdev_out
};
224 return undef if !nf_dev_match
($devre, $pkg->{physdev_out
});
228 if ($rule =~ s
@^-m mark
--mark
($NUMBER_RE)(?
:/($NUMBER_RE))?\s
*@@) {
229 my ($value, $mask) = PVE
::Firewall
::get_mark_values
($1, $2);
230 return undef if !defined($mark) || ($mark & $mask) != $value;
236 if ($rule =~ s
@^-j MARK
--set-mark
($NUMBER_RE)(?
:/($NUMBER_RE))?\s
*$@@) {
237 my ($value, $mask) = PVE
::Firewall
::get_mark_values
($1, $2);
238 $mark = ($mark & ~$mask) | $value;
242 if ($rule =~ s/^-j (\S+)\s*$//) {
246 if ($rule =~ s/^-g (\S+)\s*$//) {
250 if ($rule =~ s/^-j NFLOG --nflog-prefix \"[^\"]+\"$//) {
257 die "unable to parse rule: $rule";
260 sub ruleset_simulate_chain
{
261 my ($ruleset, $ipset_ruleset, $chain, $pkg) = @_;
263 add_trace
("ENTER chain $chain\n");
267 if ($chain eq 'PVEFW-Drop') {
268 add_trace
("LEAVE chain $chain\n");
269 return ('DROP', $counter);
271 if ($chain eq 'PVEFW-reject') {
272 add_trace
("LEAVE chain $chain\n");
273 return ('REJECT', $counter);
276 if ($chain eq 'PVEFW-tcpflags') {
277 add_trace
("LEAVE chain $chain\n");
278 return (undef, $counter);
281 my $rules = $ruleset->{$chain} ||
282 die "no such chain '$chain'";
284 foreach my $rule (@$rules) {
286 my ($goto, $action) = rule_match
($ipset_ruleset, $chain, $rule, $pkg);
287 if (!defined($action)) {
288 add_trace
("SKIP: $rule\n");
291 add_trace
("MATCH: $rule\n");
293 if ($action eq 'ACCEPT' || $action eq 'DROP' || $action eq 'REJECT') {
294 add_trace
("TERMINATE chain $chain: $action\n");
295 return ($action, $counter);
296 } elsif ($action eq 'RETURN') {
297 add_trace
("RETURN FROM chain $chain\n");
301 add_trace
("LEAVE chain $chain - goto $action\n");
302 return ruleset_simulate_chain
($ruleset, $ipset_ruleset, $action, $pkg)
304 #$rules = $ruleset->{$chain} || die "no such chain '$chain'";
306 my ($act, $ctr) = ruleset_simulate_chain
($ruleset, $ipset_ruleset, $action, $pkg);
308 return ($act, $counter) if $act;
309 add_trace
("CONTINUE chain $chain\n");
314 add_trace
("LEAVE chain $chain\n");
315 if ($chain =~ m/^PVEFW-(INPUT|OUTPUT|FORWARD)$/) {
316 return ('ACCEPT', $counter); # default policy
319 return (undef, $counter);
327 while (my ($k,$v) = each %$pkg) {
334 # Try to simulate packet traversal inside kernel. This invokes iptable
335 # checks several times.
337 my ($ruleset, $ipset_ruleset, $pkg, $from_info, $target, $start_state) = @_;
339 $pkg->{ipversion
} = 4; # fixme: allow ipv6
341 my $route_state = $start_state;
345 my $ipt_invocation_counter = 0;
346 my $rule_check_counter = 0;
348 while ($route_state ne $target->{iface
}) {
351 my $next_route_state;
354 $pkg->{iface_in
} = $pkg->{iface_out
} = undef;
355 $pkg->{physdev_in
} = $pkg->{physdev_out
} = undef;
357 if ($route_state eq 'from-bport') {
358 $next_route_state = $from_info->{bridge
} || die 'internal error';
359 $next_physdev_in = $from_info->{iface
} || die 'internal error';
360 } elsif ($route_state eq 'host') {
362 if ($target->{type
} eq 'bport') {
363 $pkg->{iface_in
} = 'lo';
364 $pkg->{iface_out
} = $target->{bridge
} || die 'internal error';
365 $chain = 'PVEFW-OUTPUT';
366 $next_route_state = $target->{iface
} || die 'internal error';
367 } elsif ($target->{type
} eq 'vm' || $target->{type
} eq 'ct') {
368 $pkg->{iface_in
} = 'lo';
369 $pkg->{iface_out
} = $target->{bridge
} || die 'internal error';
370 $chain = 'PVEFW-OUTPUT';
371 $next_route_state = 'fwbr-in';
376 } elsif ($route_state eq 'fwbr-out') {
378 $chain = 'PVEFW-FORWARD';
379 $next_route_state = $from_info->{bridge
} || die 'internal error';
380 $next_physdev_in = $from_info->{fwpr
} || die 'internal error';
381 $pkg->{iface_in
} = $from_info->{fwbr
} || die 'internal error';
382 $pkg->{iface_out
} = $from_info->{fwbr
} || die 'internal error';
383 $pkg->{physdev_in
} = $from_info->{tapdev
} || die 'internal error';
384 $pkg->{physdev_out
} = $from_info->{fwln
} || die 'internal error';
386 } elsif ($route_state eq 'fwbr-in') {
388 $chain = 'PVEFW-FORWARD';
389 $next_route_state = $target->{tapdev
};
390 $pkg->{iface_in
} = $target->{fwbr
} || die 'internal error';
391 $pkg->{iface_out
} = $target->{fwbr
} || die 'internal error';
392 $pkg->{physdev_in
} = $target->{fwln
} || die 'internal error';
393 $pkg->{physdev_out
} = $target->{tapdev
} || die 'internal error';
395 } elsif ($route_state =~ m/^vmbr\d+$/) {
397 die "missing physdev_in - internal error?" if !$physdev_in;
398 $pkg->{physdev_in
} = $physdev_in;
400 if ($target->{type
} eq 'host') {
402 $chain = 'PVEFW-INPUT';
403 $pkg->{iface_in
} = $route_state;
404 $pkg->{iface_out
} = 'lo';
405 $next_route_state = 'host';
407 } elsif ($target->{type
} eq 'bport') {
409 $chain = 'PVEFW-FORWARD';
410 $pkg->{iface_in
} = $route_state;
411 $pkg->{iface_out
} = $target->{bridge
} || die 'internal error';
412 # conditionally set physdev_out (same behavior as kernel)
413 if ($route_state eq $target->{bridge
}) {
414 $pkg->{physdev_out
} = $target->{iface
} || die 'internal error';
416 $next_route_state = $target->{iface
};
418 } elsif ($target->{type
} eq 'vm' || $target->{type
} eq 'ct') {
420 $chain = 'PVEFW-FORWARD';
421 $pkg->{iface_in
} = $route_state;
422 $pkg->{iface_out
} = $target->{bridge
};
423 # conditionally set physdev_out (same behavior as kernel)
424 if ($route_state eq $target->{bridge
}) {
425 $pkg->{physdev_out
} = $target->{fwpr
} || die 'internal error';
427 $next_route_state = 'fwbr-in';
434 die "implement me $route_state";
437 die "internal error" if !defined($next_route_state);
440 add_trace
("IPT check at $route_state (chain $chain)\n");
441 add_trace
(Dumper
($pkg));
442 $ipt_invocation_counter++;
443 my ($res, $ctr) = ruleset_simulate_chain
($ruleset, $ipset_ruleset, $chain, $pkg);
444 $rule_check_counter += $ctr;
445 return ($res, $ipt_invocation_counter, $rule_check_counter) if $res ne 'ACCEPT';
448 $route_state = $next_route_state;
450 $physdev_in = $next_physdev_in;
453 return ('ACCEPT', $ipt_invocation_counter, $rule_check_counter);
456 sub extract_ct_info
{
457 my ($vmdata, $vmid, $netnum) = @_;
459 my $info = { type
=> 'ct', vmid
=> $vmid };
461 my $conf = $vmdata->{lxc
}->{$vmid} || die "no such CT '$vmid'";
462 my $net = PVE
::LXC
::Config-
>parse_lxc_network($conf->{"net$netnum"});
463 $info->{macaddr
} = $net->{hwaddr
} || die "unable to get mac address";
464 $info->{bridge
} = $net->{bridge
} || die "unable to get bridge";
465 $info->{fwbr
} = "fwbr${vmid}i$netnum";
466 $info->{tapdev
} = "veth${vmid}i$netnum";
467 $info->{fwln
} = "fwln${vmid}i$netnum";
468 $info->{fwpr
} = "fwpr${vmid}p$netnum";
469 $info->{ip_address
} = $net->{ip
} || die "unable to get ip address";
474 sub extract_vm_info
{
475 my ($vmdata, $vmid, $netnum) = @_;
477 my $info = { type
=> 'vm', vmid
=> $vmid };
479 my $conf = $vmdata->{qemu
}->{$vmid} || die "no such VM '$vmid'";
480 my $net = PVE
::QemuServer
::parse_net
($conf->{"net$netnum"});
481 $info->{macaddr
} = $net->{macaddr
} || die "unable to get mac address";
482 $info->{bridge
} = $net->{bridge
} || die "unable to get bridge";
483 $info->{fwbr
} = "fwbr${vmid}i$netnum";
484 $info->{tapdev
} = "tap${vmid}i$netnum";
485 $info->{fwln
} = "fwln${vmid}i$netnum";
486 $info->{fwpr
} = "fwpr${vmid}p$netnum";
491 sub simulate_firewall
{
492 my ($ruleset, $ipset_ruleset, $host_ip, $vmdata, $test) = @_;
494 my $from = $test->{from
} || die "missing 'from' field";
495 my $to = $test->{to
} || die "missing 'to' field";
496 my $action = $test->{action
} || die "missing 'action'";
498 my $testid = $test->{id
};
500 die "from/to needs to be different" if $from eq $to;
508 srctype
=> 'UNICAST',
509 dsttype
=> 'UNICAST',
512 while (my ($k,$v) = each %$test) {
513 next if $k eq 'from';
515 next if $k eq 'action';
517 die "unknown attribute '$k'\n" if !exists($pkg->{$k});
525 if ($from eq 'host') {
526 $from_info->{type
} = 'host';
527 $start_state = 'host';
528 $pkg->{source
} = $host_ip if !defined($pkg->{source
});
529 } elsif ($from =~ m
|^(vmbr\d
+)/(\S
+)$|) {
530 $from_info->{type
} = 'bport';
531 $from_info->{bridge
} = $1;
532 $from_info->{iface
} = $2;
533 $start_state = 'from-bport';
534 } elsif ($from eq 'outside') {
535 $from_info->{type
} = 'bport';
536 $from_info->{bridge
} = 'vmbr0';
537 $from_info->{iface
} = 'eth0';
538 $start_state = 'from-bport';
539 } elsif ($from eq 'nfvm') {
540 $from_info->{type
} = 'bport';
541 $from_info->{bridge
} = 'vmbr0';
542 $from_info->{iface
} = 'tapXYZ';
543 $start_state = 'from-bport';
544 } elsif ($from =~ m/^ct(\d+)$/) {
545 return 'SKIPPED' if !$have_lxc;
547 $from_info = extract_ct_info
($vmdata, $vmid, 0);
548 $start_state = 'fwbr-out';
549 $pkg->{mac_source
} = $from_info->{macaddr
};
550 } elsif ($from =~ m/^vm(\d+)(i(\d))?$/) {
551 return 'SKIPPED' if !$have_qemu_server;
553 my $netnum = $3 || 0;
554 $from_info = extract_vm_info
($vmdata, $vmid, $netnum);
555 $start_state = 'fwbr-out';
556 $pkg->{mac_source
} = $from_info->{macaddr
};
558 die "unable to parse \"from => '$from'\"\n";
564 $target->{type
} = 'host';
565 $target->{iface
} = 'host';
566 $pkg->{dest
} = $host_ip if !defined($pkg->{dest
});
567 } elsif ($to =~ m
|^(vmbr\d
+)/(\S
+)$|) {
568 $target->{type
} = 'bport';
569 $target->{bridge
} = $1;
570 $target->{iface
} = $2;
571 } elsif ($to eq 'outside') {
572 $target->{type
} = 'bport';
573 $target->{bridge
} = 'vmbr0';
574 $target->{iface
} = 'eth0';
575 } elsif ($to eq 'nfvm') {
576 $target->{type
} = 'bport';
577 $target->{bridge
} = 'vmbr0';
578 $target->{iface
} = 'tapXYZ';
579 } elsif ($to =~ m/^ct(\d+)$/) {
580 return 'SKIPPED' if !$have_lxc;
582 $target = extract_ct_info
($vmdata, $vmid, 0);
583 $target->{iface
} = $target->{tapdev
};
584 } elsif ($to =~ m/^vm(\d+)$/) {
585 return 'SKIPPED' if !$have_qemu_server;
587 $target = extract_vm_info
($vmdata, $vmid, 0);
588 $target->{iface
} = $target->{tapdev
};
590 die "unable to parse \"to => '$to'\"\n";
593 $pkg->{source
} = '100.100.1.2' if !defined($pkg->{source
});
594 $pkg->{dest
} = '100.200.3.4' if !defined($pkg->{dest
});
596 my ($res, $ic, $rc) = route_packet
($ruleset, $ipset_ruleset, $pkg,
597 $from_info, $target, $start_state);
599 add_trace
("IPT statistics: invocation = $ic, checks = $rc\n");
601 return $res if $action eq 'QUERY';
603 die "test failed ($res != $action)\n" if $action ne $res;