1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
|
<?php
/*
diag_packet_capture.php
*/
/* ====================================================================
* Copyright (c) 2004-2015 Electric Sheep Fencing, LLC. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modification,
* are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgment:
* "This product includes software developed by the pfSense Project
* for use in the pfSense software distribution. (http://www.pfsense.org/).
*
* 4. The names "pfSense" and "pfSense Project" must not be used to
* endorse or promote products derived from this software without
* prior written permission. For written permission, please contact
* coreteam@pfsense.org.
*
* 5. Products derived from this software may not be called "pfSense"
* nor may "pfSense" appear in their names without prior written
* permission of the Electric Sheep Fencing, LLC.
*
* 6. Redistributions of any form whatsoever must retain the following
* acknowledgment:
*
* "This product includes software developed by the pfSense Project
* for use in the pfSense software distribution (http://www.pfsense.org/).
*
* THIS SOFTWARE IS PROVIDED BY THE pfSense PROJECT ``AS IS'' AND ANY
* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE pfSense PROJECT OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
*
* ====================================================================
*
*/
##|+PRIV
##|*IDENT=page-diagnostics-packetcapture
##|*NAME=Diagnostics: Packet Capture
##|*DESCR=Allow access to the 'Diagnostics: Packet Capture' page.
##|*MATCH=diag_packet_capture.php*
##|-PRIV
$allowautocomplete = true;
function fixup_host_logic($value) {
return str_replace(array(" ", ",", "+", "|", "!"), array("", "and ", "and ", "or ", "not "), $value);
}
function strip_host_logic($value) {
return str_replace(array(" ", ",", "+", "|", "!"), array("", "", "", "", ""), $value);
}
function get_host_boolean($value, $host) {
$value = str_replace(array("!", $host), array("", ""), $value);
$andor = "";
switch (trim($value)) {
case "|":
$andor = "or ";
break;
case ",":
case "+":
$andor = "and ";
break;
}
return $andor;
}
function has_not($value) {
return strpos($value, '!') !== false;
}
function fixup_not($value) {
return str_replace("!", "not ", $value);
}
function strip_not($value) {
return ltrim(trim($value), '!');
}
function fixup_host($value, $position) {
$host = strip_host_logic($value);
$not = has_not($value) ? "not " : "";
$andor = ($position > 0) ? get_host_boolean($value, $host) : "";
if (is_ipaddr($host)) {
return "{$andor}host {$not}" . $host;
} elseif (is_subnet($host)) {
return "{$andor}net {$not}" . $host;
} else {
return "";
}
}
if ($_POST['downloadbtn'] == gettext("Download Capture")) {
$nocsrf = true;
}
$pgtitle = array(gettext("Diagnostics"), gettext("Packet Capture"));
require_once("guiconfig.inc");
require_once("pfsense-utils.inc");
require_once("ipsec.inc");
$fp = "/root/";
$fn = "packetcapture.cap";
$snaplen = 0;//default packet length
$count = 100;//default number of packets to capture
$fams = array('ip', 'ip6');
$protos = array('icmp', 'icmp6', 'tcp', 'udp', 'arp', 'carp', 'esp',
'!icmp', '!icmp6', '!tcp', '!udp', '!arp', '!carp', '!esp');
$input_errors = array();
$interfaces = get_configured_interface_with_descr();
if (ipsec_enabled()) {
$interfaces['enc0'] = "IPsec";
}
foreach (array('server', 'client') as $mode) {
if (is_array($config['openvpn']["openvpn-{$mode}"])) {
foreach ($config['openvpn']["openvpn-{$mode}"] as $id => $setting) {
if (!isset($setting['disable'])) {
$interfaces['ovpn' . substr($mode, 0, 1) . $setting['vpnid']] = gettext("OpenVPN") . " ".$mode.": ".htmlspecialchars($setting['description']);
}
}
}
}
if ($_POST) {
$host = $_POST['host'];
$selectedif = $_POST['interface'];
$count = $_POST['count'];
$snaplen = $_POST['snaplen'];
$port = $_POST['port'];
$detail = $_POST['detail'];
$fam = $_POST['fam'];
$proto = $_POST['proto'];
if (!array_key_exists($selectedif, $interfaces)) {
$input_errors[] = gettext("Invalid interface.");
}
if ($fam !== "" && $fam !== "ip" && $fam !== "ip6") {
$input_errors[] = gettext("Invalid address family.");
}
if ($proto !== "" && !in_array(strip_not($proto), $protos)) {
$input_errors[] = gettext("Invalid protocol.");
}
if ($host != "") {
$host_string = str_replace(array(" ", "|", ","), array("", "#|", "#+"), $host);
if (strpos($host_string, '#') === false) {
$hosts = array($host);
} else {
$hosts = explode('#', $host_string);
}
foreach ($hosts as $h) {
if (!is_subnet(strip_host_logic($h)) && !is_ipaddr(strip_host_logic($h))) {
$input_errors[] = sprintf(gettext("A valid IP address or CIDR block must be specified. [%s]"), $h);
}
}
}
if ($port != "") {
if (!is_port(strip_not($port))) {
$input_errors[] = gettext("Invalid value specified for port.");
}
}
if ($snaplen == "") {
$snaplen = 0;
} else {
if (!is_numeric($snaplen) || $snaplen < 0) {
$input_errors[] = gettext("Invalid value specified for packet length.");
}
}
if ($count == "") {
$count = 0;
} else {
if (!is_numeric($count) || $count < 0) {
$input_errors[] = gettext("Invalid value specified for packet count.");
}
}
if (!count($input_errors)) {
$do_tcpdump = true;
conf_mount_rw();
if ($_POST['promiscuous']) {
//if promiscuous mode is checked
$disablepromiscuous = "";
} else {
//if promiscuous mode is unchecked
$disablepromiscuous = "-p";
}
if ($_POST['dnsquery']) {
//if dns lookup is checked
$disabledns = "";
} else {
//if dns lookup is unchecked
$disabledns = "-n";
}
if ($_POST['startbtn'] != "") {
$action = gettext("Start");
//delete previous packet capture if it exists
if (file_exists($fp.$fn)) {
unlink ($fp.$fn);
}
} elseif ($_POST['stopbtn'] != "") {
$action = gettext("Stop");
$processes_running = trim(shell_exec("/bin/ps axw -O pid= | /usr/bin/grep tcpdump | /usr/bin/grep {$fn} | /usr/bin/egrep -v '(pflog|grep)'"));
//explode processes into an array, (delimiter is new line)
$processes_running_array = explode("\n", $processes_running);
//kill each of the packetcapture processes
foreach ($processes_running_array as $process) {
$process_id_pos = strpos($process, ' ');
$process_id = substr($process, 0, $process_id_pos);
exec("kill $process_id");
}
} elseif ($_POST['downloadbtn'] != "") {
//download file
$fs = filesize($fp.$fn);
header("Content-Type: application/octet-stream");
header("Content-Disposition: attachment; filename=$fn");
header("Content-Length: $fs");
readfile($fp.$fn);
exit;
}
}
} else {
$do_tcpdump = false;
}
$excl = gettext("Exclude");
$protocollist = array(
'' => 'Any',
'icmp' => 'ICMP',
'!icmp' => $excl . ' ICMP',
'icmp6' => 'ICMPv6',
'!icmp6' => $excl . ' ICMPv6',
'tcp' => 'TCP',
'!tcp' => $excl . ' TCP',
'udp' => 'UDP',
'!udp' => $excl . ' UDP',
'arp' => 'ARP',
'!arp' => $excl . ' ARP',
'carp' => 'CARP (VRRP)',
'!carp' => $excl . ' CARP (VRRP)',
'esp' => 'ESP'
);
include("head.inc");
if ($input_errors) {
print_input_errors($input_errors);
}
$form = new Form(false); // No button yet. We add those later depending on the required action
$section = new Form_Section('Packet Capture Options');
$section->addInput(new Form_Select(
'interface',
'Interface',
$selectedif,
$interfaces
))->setHelp('Select the interface on which to capture traffic. ');
$section->addInput(new Form_Checkbox(
'promiscuous',
'Promiscuous',
'Packet capture will be performed using promiscuous mode',
$pconfig['promiscuous']
))->setHelp('Note: Some network adapters do not support or work well in promiscuous mode.'. '<br />' .
'More: ' . '<a target="_blank" href="http://www.freebsd.org/cgi/man.cgi?query=tcpdump&apropos=0&sektion=0&manpath=FreeBSD+8.3-stable&arch=default&format=html">' .
'Packet capture' . '</a>');
$section->addInput(new Form_Select(
'fam',
'Address Family',
$fam,
array('' => 'Any',
'ip' => gettext('IPv4 Only'),
'ip6' => gettext('IPv6 Only')
)
))->setHelp('Select the type of traffic to be captured');
$section->addInput(new Form_Select(
'proto',
'Protocol',
$proto,
$protocollist
))->setHelp('Select the protocol to capture, or "Any". ');
$section->addInput(new Form_Input(
'host',
'Host Address',
'text',
$host
))->setHelp('This value is either the Source or Destination IP address or subnet in CIDR notation. The packet capture will look for this address in either field.' . '<br />' .
'Matching can be negated by preceding the value with "!". Multiple IP addresses or CIDR subnets may be specified. Comma (",") separated values perform a boolean "AND". ' .
'Separating with a pipe ("|") performs a boolean "OR".' . '<br />' .
'If you leave this field blank, all packets on the specified interface will be captured.');
$section->addInput(new Form_Input(
'port',
'Port',
'text',
$port
))->setHelp('The port can be either the source or destination port. The packet capture will look for this port in either field. ' .
'Leave blank if you do not want to filter by port.');
$section->addInput(new Form_Input(
'snaplen',
'Packet Length',
'text',
$snaplen
))->setHelp('The Packet length is the number of bytes of each packet that will be captured. Default value is 0, ' .
'which will capture the entire frame regardless of its size.');
$section->addInput(new Form_Input(
'count',
'Count',
'text',
$count
))->setHelp('This is the number of packets the packet capture will grab. Default value is 100.' . '<br />' .
'Enter 0 (zero) for no count limit.');
$section->addInput(new Form_Select(
'detail',
'Level of detail',
$detail,
array('normal' => 'Normal',
'medium' => 'Medium',
'high' => 'High',
'full' => 'Full',
)
))->setHelp('This is the level of detail that will be displayed after hitting "Stop" when the packets have been captured.' . '<br />' .
'This option does not affect the level of detail when downloading the packet capture. ');
$section->addInput(new Form_Checkbox(
'dnsquery',
'Reverse DNS Lookup',
'Do reverse DNS lookup',
$_POST['dnsquery']
))->setHelp('This check box will cause the packet capture to perform a reverse DNS lookup associated with all IP addresses.' . '<br />' .
'This option can cause delays for large packet captures.');
$form->add($section);
/* check to see if packet capture tcpdump is already running */
$processcheck = (trim(shell_exec("/bin/ps axw -O pid= | /usr/bin/grep tcpdump | /usr/bin/grep {$fn} | /usr/bin/egrep -v '(pflog|grep)'")));
$processisrunning = ($processcheck != "");
if (($action == gettext("Stop") or $action == "") and $processisrunning != true) {
$form->addGlobal(new Form_Button(
'startbtn',
'Start'
))->removeClass('btn-primary')->addClass('btn-success');
} else {
$form->addGlobal(new Form_Button(
'stopbtn',
'Stop'
))->removeClass('btn-primary')->addClass('btn-warning');
}
if (file_exists($fp.$fn) and $processisrunning != true) {
$form->addGlobal(new Form_Button(
'viewbtn',
'View Capture'
))->removeClass('btn-primary');
$form->addGlobal(new Form_Button(
'downloadbtn',
'Download Capture'
))->removeClass('btn-primary');
$section->addInput(new Form_StaticText(
'Last capture',
date("F jS, Y g:i:s a.", filemtime($fp.$fn))
));
}
print($form);
if ($do_tcpdump) :
$matches = array();
if (in_array($fam, $fams)) {
$matches[] = $fam;
}
if (in_array($proto, $protos)) {
$matches[] = fixup_not($proto);
}
if ($port != "") {
$matches[] = "port ".fixup_not($port);
}
if ($host != "") {
$hostmatch = "";
$hostcount = 0;
foreach ($hosts as $h) {
$h = fixup_host($h, $hostcount++);
if (!empty($h)) {
$hostmatch .= " " . $h;
}
}
if (!empty($hostmatch)) {
$matches[] = "({$hostmatch})";
}
}
if ($count != "0") {
$searchcount = "-c " . $count;
} else {
$searchcount = "";
}
$selectedif = convert_friendly_interface_to_real_interface_name($selectedif);
if ($action == gettext("Start")) {
$matchstr = implode($matches, " and ");
print_info_box(gettext('Packet Capture is running'), 'info');
$cmd = "/usr/sbin/tcpdump -i {$selectedif} {$disablepromiscuous} {$searchcount} -s {$snaplen} -w {$fp}{$fn} " . escapeshellarg($matchstr);
// Debug
//echo $cmd;
mwexec_bg ($cmd);
} else {
?>
<div class="panel panel-default">
<div class="panel-heading"><h2 class="panel-title"><?=gettext('Packets Captured')?></h2></div>
<div class="panel-body">
<div class="form-group">
<?php
$detail_args = "";
switch ($detail) {
case "full":
$detail_args = "-vv -e";
break;
case "high":
$detail_args = "-vv";
break;
case "medium":
$detail_args = "-v";
break;
case "normal":
default:
$detail_args = "-q";
break;
}
print('<textarea class="form-control" rows="20" style="font-size: 13px; font-family: consolas,monaco,roboto mono,liberation mono,courier;">');
system("/usr/sbin/tcpdump {$disabledns} {$detail_args} -r {$fp}{$fn}");
print('</textarea>');
conf_mount_ro();
?>
</div>
</div>
</div>
<?php
}
endif;
include("foot.inc");
|