]>
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;
32 $debug = $new_value if defined($new_value);
54 $SIG{'__WARN__'} = sub {
63 my ($devre, $dev) = @_;
65 $devre =~ s/\+$/\.\*/;
66 return ($dev =~ m/^${devre}$/) ?
1 : 0;
70 my ($ipset_ruleset, $ipsetname, $ipaddr) = @_;
72 my $ipset = $ipset_ruleset->{$ipsetname};
73 die "no such ipset '$ipsetname'" if !$ipset;
75 my $ip = Net
::IP-
>new($ipaddr);
77 my $first = $ipset->[0];
78 if ($first =~ m/^create\s+\S+\s+list:/) {
79 foreach my $entry (@$ipset) {
80 next if $entry =~ m/^create/; # simply ignore
81 if ($entry =~ m/add \S+ (\S+)$/) {
82 return 1 if ipset_match
($ipset_ruleset, $1, $ipaddr);
88 } elsif ($first =~ m/^create\s+\S+\s+hash:net/) {
89 foreach my $entry (@$ipset) {
90 next if $entry =~ m/^create/; # simply ignore
91 if ($entry =~ m/add \S+ (\S+)$/) {
92 my $test = Net
::IP-
>new($1);
93 if ($test->overlaps($ip)) {
94 add_trace
("IPSET $ipsetname match $ipaddr\n");
103 die "unknown ipset type '$first' - not implemented\n";
110 my ($ipset_ruleset, $chain, $rule, $pkg) = @_;
112 $rule =~ s/^-A $chain +// || die "got strange rule: $rule";
114 while (length($rule)) {
116 if ($rule =~ s/^-m conntrack --ctstate (\S+)\s*//) {
119 return undef if $cstate eq 'INVALID'; # no match
120 return undef if $cstate eq 'RELATED,ESTABLISHED'; # no match
122 next if $cstate =~ m/NEW/;
124 die "cstate test '$cstate' not implemented\n";
127 if ($rule =~ s/^-m addrtype --src-type (\S+)\s*//) {
129 die "missing source address type (srctype)\n"
131 return undef if $atype ne $pkg->{srctype
};
134 if ($rule =~ s/^-m addrtype --dst-type (\S+)\s*//) {
136 die "missing destination address type (dsttype)\n"
138 return undef if $atype ne $pkg->{dsttype
};
141 if ($rule =~ s/^-m icmp(v6)? --icmp-type (\S+)\s*//) {
144 die "missing destination address type (dsttype)\n" if !defined($pkg->{dport
});
145 return undef if $icmptype ne $pkg->{dport
};
148 if ($rule =~ s/^-i (\S+)\s*//) {
150 die "missing interface (iface_in)\n" if !$pkg->{iface_in
};
151 return undef if !nf_dev_match
($devre, $pkg->{iface_in
});
155 if ($rule =~ s/^-o (\S+)\s*//) {
157 die "missing interface (iface_out)\n" if !$pkg->{iface_out
};
158 return undef if !nf_dev_match
($devre, $pkg->{iface_out
});
162 if ($rule =~ s/^-p (tcp|udp|igmp|icmp)\s*//) {
163 die "missing proto" if !$pkg->{proto
};
164 return undef if $pkg->{proto
} ne $1; # no match
168 if ($rule =~ s/^--dport (\d+):(\d+)\s*//) {
169 die "missing dport" if !$pkg->{dport
};
170 return undef if ($pkg->{dport
} < $1) || ($pkg->{dport
} > $2); # no match
174 if ($rule =~ s/^--dport (\d+)\s*//) {
175 die "missing dport" if !$pkg->{dport
};
176 return undef if $pkg->{dport
} != $1; # no match
180 if ($rule =~ s/^-s (\S+)\s*//) {
181 die "missing source" if !$pkg->{source
};
182 my $ip = Net
::IP-
>new($1);
183 return undef if !$ip->overlaps(Net
::IP-
>new($pkg->{source
})); # no match
187 if ($rule =~ s/^-d (\S+)\s*//) {
188 die "missing destination" if !$pkg->{dest
};
189 my $ip = Net
::IP-
>new($1);
190 return undef if !$ip->overlaps(Net
::IP-
>new($pkg->{dest
})); # no match
194 if ($rule =~ s/^-m set (!\s+)?--match-set (\S+) src\s*//) {
195 die "missing source" if !$pkg->{source
};
199 return undef if ipset_match
($ipset_ruleset, $ipset_name, $pkg->{source
});
201 return undef if !ipset_match
($ipset_ruleset, $ipset_name, $pkg->{source
});
206 if ($rule =~ s/^-m set --match-set (\S+) dst\s*//) {
207 die "missing destination" if !$pkg->{dest
};
209 return undef if !ipset_match
($ipset_ruleset, $ipset_name, $pkg->{dest
});
213 if ($rule =~ s/^-m mac ! --mac-source (\S+)\s*//) {
214 die "missing source mac" if !$pkg->{mac_source
};
215 return undef if $pkg->{mac_source
} eq $1; # no match
219 if ($rule =~ s/^-m physdev --physdev-is-bridged --physdev-in (\S+)\s*//) {
221 return undef if !$pkg->{physdev_in
};
222 return undef if !nf_dev_match
($devre, $pkg->{physdev_in
});
226 if ($rule =~ s/^-m physdev --physdev-is-bridged --physdev-out (\S+)\s*//) {
228 return undef if !$pkg->{physdev_out
};
229 return undef if !nf_dev_match
($devre, $pkg->{physdev_out
});
233 if ($rule =~ s
@^-m mark
--mark
($NUMBER_RE)(?
:/($NUMBER_RE))?\s
*@@) {
234 my ($value, $mask) = PVE
::Firewall
::get_mark_values
($1, $2);
235 return undef if ($mark & $mask) != $value;
241 if ($rule =~ s
@^-j MARK
--set-mark
($NUMBER_RE)(?
:/($NUMBER_RE))?\s
*$@@) {
242 my ($value, $mask) = PVE
::Firewall
::get_mark_values
($1, $2);
243 $mark = ($mark & ~$mask) | $value;
247 if ($rule =~ s/^-j (\S+)\s*$//) {
251 if ($rule =~ s/^-g (\S+)\s*$//) {
255 if ($rule =~ s/^-j NFLOG --nflog-prefix \"[^\"]+\"$//) {
262 die "unable to parse rule: $rule";
265 sub ruleset_simulate_chain
{
266 my ($ruleset, $ipset_ruleset, $chain, $pkg) = @_;
268 add_trace
("ENTER chain $chain\n");
272 if ($chain eq 'PVEFW-Drop') {
273 add_trace
("LEAVE chain $chain\n");
274 return ('DROP', $counter);
276 if ($chain eq 'PVEFW-reject') {
277 add_trace
("LEAVE chain $chain\n");
278 return ('REJECT', $counter);
281 if ($chain eq 'PVEFW-tcpflags') {
282 add_trace
("LEAVE chain $chain\n");
283 return (undef, $counter);
286 my $rules = $ruleset->{$chain} ||
287 die "no such chain '$chain'";
289 foreach my $rule (@$rules) {
291 my ($goto, $action) = rule_match
($ipset_ruleset, $chain, $rule, $pkg);
292 if (!defined($action)) {
293 add_trace
("SKIP: $rule\n");
296 add_trace
("MATCH: $rule\n");
298 if ($action eq 'ACCEPT' || $action eq 'DROP' || $action eq 'REJECT') {
299 add_trace
("TERMINATE chain $chain: $action\n");
300 return ($action, $counter);
301 } elsif ($action eq 'RETURN') {
302 add_trace
("RETURN FROM chain $chain\n");
306 add_trace
("LEAVE chain $chain - goto $action\n");
307 return ruleset_simulate_chain
($ruleset, $ipset_ruleset, $action, $pkg)
309 #$rules = $ruleset->{$chain} || die "no such chain '$chain'";
311 my ($act, $ctr) = ruleset_simulate_chain
($ruleset, $ipset_ruleset, $action, $pkg);
313 return ($act, $counter) if $act;
314 add_trace
("CONTINUE chain $chain\n");
319 add_trace
("LEAVE chain $chain\n");
320 if ($chain =~ m/^PVEFW-(INPUT|OUTPUT|FORWARD)$/) {
321 return ('ACCEPT', $counter); # default policy
324 return (undef, $counter);
332 while (my ($k,$v) = each %$pkg) {
339 # Try to simulate packet traversal inside kernel. This invokes iptable
340 # checks several times.
342 my ($ruleset, $ipset_ruleset, $pkg, $from_info, $target, $start_state) = @_;
344 $pkg->{ipversion
} = 4; # fixme: allow ipv6
346 my $route_state = $start_state;
350 my $ipt_invocation_counter = 0;
351 my $rule_check_counter = 0;
353 while ($route_state ne $target->{iface
}) {
356 my $next_route_state;
359 $pkg->{iface_in
} = $pkg->{iface_out
} = undef;
360 $pkg->{physdev_in
} = $pkg->{physdev_out
} = undef;
362 if ($route_state eq 'from-bport') {
363 $next_route_state = $from_info->{bridge
} || die 'internal error';
364 $next_physdev_in = $from_info->{iface
} || die 'internal error';
365 } elsif ($route_state eq 'host') {
367 if ($target->{type
} eq 'bport') {
368 $pkg->{iface_in
} = 'lo';
369 $pkg->{iface_out
} = $target->{bridge
} || die 'internal error';
370 $chain = 'PVEFW-OUTPUT';
371 $next_route_state = $target->{iface
} || die 'internal error';
372 } elsif ($target->{type
} eq 'vm' || $target->{type
} eq 'ct') {
373 $pkg->{iface_in
} = 'lo';
374 $pkg->{iface_out
} = $target->{bridge
} || die 'internal error';
375 $chain = 'PVEFW-OUTPUT';
376 $next_route_state = 'fwbr-in';
381 } elsif ($route_state eq 'fwbr-out') {
383 $chain = 'PVEFW-FORWARD';
384 $next_route_state = $from_info->{bridge
} || die 'internal error';
385 $next_physdev_in = $from_info->{fwpr
} || die 'internal error';
386 $pkg->{iface_in
} = $from_info->{fwbr
} || die 'internal error';
387 $pkg->{iface_out
} = $from_info->{fwbr
} || die 'internal error';
388 $pkg->{physdev_in
} = $from_info->{tapdev
} || die 'internal error';
389 $pkg->{physdev_out
} = $from_info->{fwln
} || die 'internal error';
391 } elsif ($route_state eq 'fwbr-in') {
393 $chain = 'PVEFW-FORWARD';
394 $next_route_state = $target->{tapdev
};
395 $pkg->{iface_in
} = $target->{fwbr
} || die 'internal error';
396 $pkg->{iface_out
} = $target->{fwbr
} || die 'internal error';
397 $pkg->{physdev_in
} = $target->{fwln
} || die 'internal error';
398 $pkg->{physdev_out
} = $target->{tapdev
} || die 'internal error';
400 } elsif ($route_state =~ m/^vmbr\d+$/) {
402 die "missing physdev_in - internal error?" if !$physdev_in;
403 $pkg->{physdev_in
} = $physdev_in;
405 if ($target->{type
} eq 'host') {
407 $chain = 'PVEFW-INPUT';
408 $pkg->{iface_in
} = $route_state;
409 $pkg->{iface_out
} = 'lo';
410 $next_route_state = 'host';
412 } elsif ($target->{type
} eq 'bport') {
414 $chain = 'PVEFW-FORWARD';
415 $pkg->{iface_in
} = $route_state;
416 $pkg->{iface_out
} = $target->{bridge
} || die 'internal error';
417 # conditionally set physdev_out (same behavior as kernel)
418 if ($route_state eq $target->{bridge
}) {
419 $pkg->{physdev_out
} = $target->{iface
} || die 'internal error';
421 $next_route_state = $target->{iface
};
423 } elsif ($target->{type
} eq 'vm' || $target->{type
} eq 'ct') {
425 $chain = 'PVEFW-FORWARD';
426 $pkg->{iface_in
} = $route_state;
427 $pkg->{iface_out
} = $target->{bridge
};
428 # conditionally set physdev_out (same behavior as kernel)
429 if ($route_state eq $target->{bridge
}) {
430 $pkg->{physdev_out
} = $target->{fwpr
} || die 'internal error';
432 $next_route_state = 'fwbr-in';
439 die "implement me $route_state";
442 die "internal error" if !defined($next_route_state);
445 add_trace
("IPT check at $route_state (chain $chain)\n");
446 add_trace
(Dumper
($pkg));
447 $ipt_invocation_counter++;
448 my ($res, $ctr) = ruleset_simulate_chain
($ruleset, $ipset_ruleset, $chain, $pkg);
449 $rule_check_counter += $ctr;
450 return ($res, $ipt_invocation_counter, $rule_check_counter) if $res ne 'ACCEPT';
453 $route_state = $next_route_state;
455 $physdev_in = $next_physdev_in;
458 return ('ACCEPT', $ipt_invocation_counter, $rule_check_counter);
461 sub extract_ct_info
{
462 my ($vmdata, $vmid, $netnum) = @_;
464 my $info = { type
=> 'ct', vmid
=> $vmid };
466 my $conf = $vmdata->{lxc
}->{$vmid} || die "no such CT '$vmid'";
467 my $net = PVE
::LXC
::Config-
>parse_lxc_network($conf->{"net$netnum"});
468 $info->{macaddr
} = $net->{hwaddr
} || die "unable to get mac address";
469 $info->{bridge
} = $net->{bridge
} || die "unable to get bridge";
470 $info->{fwbr
} = "fwbr${vmid}i$netnum";
471 $info->{tapdev
} = "veth${vmid}i$netnum";
472 $info->{fwln
} = "fwln${vmid}i$netnum";
473 $info->{fwpr
} = "fwpr${vmid}p$netnum";
474 $info->{ip_address
} = $net->{ip
} || die "unable to get ip address";
479 sub extract_vm_info
{
480 my ($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+)$/) {
550 return 'SKIPPED' if !$have_lxc;
552 $from_info = extract_ct_info
($vmdata, $vmid, 0);
553 $start_state = 'fwbr-out';
554 $pkg->{mac_source
} = $from_info->{macaddr
};
555 } elsif ($from =~ m/^vm(\d+)(i(\d))?$/) {
556 return 'SKIPPED' if !$have_qemu_server;
558 my $netnum = $3 || 0;
559 $from_info = extract_vm_info
($vmdata, $vmid, $netnum);
560 $start_state = 'fwbr-out';
561 $pkg->{mac_source
} = $from_info->{macaddr
};
563 die "unable to parse \"from => '$from'\"\n";
569 $target->{type
} = 'host';
570 $target->{iface
} = 'host';
571 $pkg->{dest
} = $host_ip if !defined($pkg->{dest
});
572 } elsif ($to =~ m
|^(vmbr\d
+)/(\S
+)$|) {
573 $target->{type
} = 'bport';
574 $target->{bridge
} = $1;
575 $target->{iface
} = $2;
576 } elsif ($to eq 'outside') {
577 $target->{type
} = 'bport';
578 $target->{bridge
} = 'vmbr0';
579 $target->{iface
} = 'eth0';
580 } elsif ($to eq 'nfvm') {
581 $target->{type
} = 'bport';
582 $target->{bridge
} = 'vmbr0';
583 $target->{iface
} = 'tapXYZ';
584 } elsif ($to =~ m/^ct(\d+)$/) {
585 return 'SKIPPED' if !$have_lxc;
587 $target = extract_ct_info
($vmdata, $vmid, 0);
588 $target->{iface
} = $target->{tapdev
};
589 } elsif ($to =~ m/^vm(\d+)$/) {
590 return 'SKIPPED' if !$have_qemu_server;
592 $target = extract_vm_info
($vmdata, $vmid, 0);
593 $target->{iface
} = $target->{tapdev
};
595 die "unable to parse \"to => '$to'\"\n";
598 $pkg->{source
} = '100.100.1.2' if !defined($pkg->{source
});
599 $pkg->{dest
} = '100.200.3.4' if !defined($pkg->{dest
});
601 my ($res, $ic, $rc) = route_packet
($ruleset, $ipset_ruleset, $pkg,
602 $from_info, $target, $start_state);
604 add_trace
("IPT statistics: invocation = $ic, checks = $rc\n");
606 return $res if $action eq 'QUERY';
608 die "test failed ($res != $action)\n" if $action ne $res;