summaryrefslogtreecommitdiffstats
path: root/src/etc/inc/easyrule.inc
blob: 199e7d0c7c3eba5a6852a097efb7981e0025a461 (plain)
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
<?php
/*
	easyrule.inc

	Copyright (C) 2009-2010 Jim Pingle (jpingle@gmail.com)
	Originally Sponsored By Anathematic @ pfSense Forums
	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.

	THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS 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
	AUTHOR 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.
*/
/*
	pfSense_BUILDER_BINARIES:
	pfSense_MODULE:	filter
*/

$blockaliasname = 'EasyRuleBlockHosts';
$protocols_with_ports = array('tcp', 'udp');
require_once("functions.inc");
require_once("util.inc");
require_once("ipsec.inc");
require_once("config.inc");

function easyrule_find_rule_interface($int) {
	global $config;
	/* Borrowed from firewall_rules.php */
	$iflist = get_configured_interface_with_descr(false, true);

	if ($config['pppoe']['mode'] == "server") {
		$iflist['pppoe'] = "PPPoE Server";
	}

	if ($config['l2tp']['mode'] == "server") {
		$iflist['l2tp'] = "L2TP VPN";
	}

	/* add ipsec interfaces */
	if (ipsec_enabled())
		$iflist["enc0"] = "IPSEC";

	if (isset($iflist[$int])) {
		return $int;
	}

	foreach ($iflist as $if => $ifd) {
		if (strtolower($int) == strtolower($ifd)) {
			return $if;
		}
	}

	if (substr($int, 0, 4) == "ovpn") {
		return "openvpn";
	}

	return false;
}

function easyrule_block_rule_exists($int = 'wan', $ipproto = "inet") {
	global $blockaliasname, $config;
	/* No rules, we we know it doesn't exist */
	if (!is_array($config['filter']['rule'])) {
		return false;
	}

	/* Search through the rules for one referencing our alias */
	foreach ($config['filter']['rule'] as $rule) {
		if (!is_array($rule) || !is_array($rule['source'])) {
			continue;
		}
		$checkproto = isset($rule['ipprotocol']) ? $rule['ipprotocol'] : "inet";
		if ($rule['source']['address'] == $blockaliasname . strtoupper($int) && ($rule['interface'] == $int) && ($checkproto == $ipproto)) {
			return true;
		}
	}
	return false;
}

function easyrule_block_rule_create($int = 'wan', $ipproto = "inet") {
	global $blockaliasname, $config;
	/* If the alias doesn't exist, exit.
	 * Can't create an empty alias, and we don't know a host */
	if (easyrule_block_alias_getid($int) === false) {
		return false;
	}

	/* If the rule already exists, no need to do it again */
	if (easyrule_block_rule_exists($int, $ipproto)) {
		return true;
	}

	/* No rules, start a new array */
	if (!is_array($config['filter']['rule'])) {
		$config['filter']['rule'] = array();
	}

	filter_rules_sort();
	$a_filter = &$config['filter']['rule'];

	/* Make up a new rule */
	$filterent = array();
	$filterent['type'] = 'block';
	$filterent['interface'] = $int;
	$filterent['ipprotocol'] = $ipproto;
	$filterent['source']['address'] = $blockaliasname . strtoupper($int);
	$filterent['destination']['any'] = '';
	$filterent['descr'] = gettext("Easy Rule: Blocked from Firewall Log View");
	$filterent['created'] = make_config_revision_entry(null, gettext("Easy Rule"));

	array_splice($a_filter, 0, 0, array($filterent));

	return true;
}

function easyrule_block_alias_getid($int = 'wan') {
	global $blockaliasname, $config;
	if (!is_array($config['aliases'])) {
		return false;
	}

	/* Hunt down an alias with the name we want, return its id */
	foreach ($config['aliases']['alias'] as $aliasid => $alias) {
		if ($alias['name'] == $blockaliasname . strtoupper($int)) {
			return $aliasid;
		}
	}

	return false;
}

function easyrule_block_alias_add($host, $int = 'wan') {
	global $blockaliasname, $config;
	/* If the host isn't a valid IP address, bail */
	$host = trim($host, "[]");
	if (!is_ipaddr($host) && !is_subnet($host)) {
		return false;
	}

	/* If there are no aliases, start an array */
	if (!is_array($config['aliases']['alias'])) {
		$config['aliases']['alias'] = array();
	}

	$a_aliases = &$config['aliases']['alias'];

	/* Try to get the ID if the alias already exists */
	$id = easyrule_block_alias_getid($int);
	if ($id === false) {
	  unset($id);
	}

	$alias = array();

	if (is_subnet($host)) {
		list($host, $mask) = explode("/", $host);
	} elseif (is_specialnet($host)) {
		$mask = 0;
	} elseif (is_ipaddrv6($host)) {
		$mask = 128;
	} else {
		$mask = 32;
	}

	if (isset($id) && $a_aliases[$id]) {

		// Catch case when the list is empty
		if (empty($a_aliases[$id]['address'])) {
			$a_address = array();
			$a_detail = array();
		} else {
			$a_address = explode(" ", $a_aliases[$id]['address']);

			/* Make sure this IP isn't already in the list. */
			if (in_array($host.'/'.$mask, $a_address)) {
				return true;
			}
			$a_detail = explode("||", $a_aliases[$id]['detail']);
		}

		/* Since the alias already exists, just add to it. */
		$alias['name']    = $a_aliases[$id]['name'];
		$alias['type']    = $a_aliases[$id]['type'];
		$alias['descr']   = $a_aliases[$id]['descr'];

		$a_address[] = $host.'/'.$mask;
		$a_detail[] = gettext('Entry added') . ' ' . date('r');

		$alias['address'] = join(" ", $a_address);
		$alias['detail']  = join("||", $a_detail);

	} else {
		/* Create a new alias with all the proper information */
		$alias['name']    = $blockaliasname . strtoupper($int);
		$alias['type']    = 'network';
		$alias['descr']   = gettext("Hosts blocked from Firewall Log view");

		$alias['address'] = $host . '/' . $mask;
		$alias['detail']  = gettext('Entry added') . ' ' . date('r') . '||';
	}

	/* Replace the old alias if needed, otherwise tack it on the end */
	if (isset($id) && $a_aliases[$id]) {
		$a_aliases[$id] = $alias;
	} else {
		$a_aliases[] = $alias;
	}

	// Sort list
	$a_aliases = msort($a_aliases, "name");

	return true;
}

function easyrule_block_host_add($host, $int = 'wan', $ipproto = "inet") {
	global $retval;
	/* Bail if the supplied host is not a valid IP address */
	$host = trim($host, "[]");
	if (!is_ipaddr($host) && !is_subnet($host)) {
		return false;
	}

	/* Flag whether or not we need to reload the filter */
	$dirty = false;

	/* Attempt to add this host to the alias */
	if (easyrule_block_alias_add($host, $int)) {
		$dirty = true;
	} else {
		/* Couldn't add the alias, or adding the host failed. */
		return false;
	}

	/* Attempt to add the firewall rule if it doesn't exist.
	 * Failing to add the rule isn't necessarily an error, it may
	 * have been modified by the user in some way. Adding to the
	 * Alias is what's important.
	 */
	if (!easyrule_block_rule_exists($int, $ipproto)) {
		if (easyrule_block_rule_create($int, $ipproto)) {
			$dirty = true;
		} else {
			return false;
		}
	}

	/* If needed, write the config and reload the filter */
	if ($dirty) {
		write_config();
		$retval = filter_configure();
		if (!empty($_SERVER['DOCUMENT_ROOT'])) {
			header("Location: firewall_aliases.php");
			exit;
		} else {
			return true;
		}
	} else {
		return false;
	}
}

function easyrule_pass_rule_add($int, $proto, $srchost, $dsthost, $dstport, $ipproto) {
	global $config;

	/* No rules, start a new array */
	if (!is_array($config['filter']['rule'])) {
		$config['filter']['rule'] = array();
	}

	filter_rules_sort();
	$a_filter = &$config['filter']['rule'];

	/* Make up a new rule */
	$filterent = array();
	$filterent['type'] = 'pass';
	$filterent['interface'] = $int;
	$filterent['ipprotocol'] = $ipproto;
	$filterent['descr'] = gettext("Easy Rule: Passed from Firewall Log View");

	if ($proto != "any") {
		$filterent['protocol'] = $proto;
	} else {
		unset($filterent['protocol']);
	}

	/* Default to only allow echo requests, since that's what most people want and
	 *  it should be a safe choice. */
	if ($proto == "icmp") {
		$filterent['icmptype'] = 'echoreq';
	}

	if ((strtolower($proto) == "icmp6") || (strtolower($proto) == "icmpv6")) {
		$filterent['protocol'] = "icmp";
	}

	if (is_subnet($srchost)) {
		list($srchost, $srcmask) = explode("/", $srchost);
	} elseif (is_specialnet($srchost)) {
		$srcmask = 0;
	} elseif (is_ipaddrv6($srchost)) {
		$srcmask = 128;
	} else {
		$srcmask = 32;
	}

	if (is_subnet($dsthost)) {
		list($dsthost, $dstmask) = explode("/", $dsthost);
	} elseif (is_specialnet($dsthost)) {
		$dstmask = 0;
	} elseif (is_ipaddrv6($dsthost)) {
		$dstmask = 128;
	} else {
		$dstmask = 32;
	}

	pconfig_to_address($filterent['source'], $srchost, $srcmask);
	pconfig_to_address($filterent['destination'], $dsthost, $dstmask, '', $dstport, $dstport);

	$filterent['created'] = make_config_revision_entry(null, gettext("Easy Rule"));
	$a_filter[] = $filterent;

	write_config($filterent['descr']);
	$retval = filter_configure();
	if (!empty($_SERVER['DOCUMENT_ROOT'])) {
		header("Location: firewall_rules.php?if={$int}");
		exit;
	} else {
		return true;
	}
}

function easyrule_parse_block($int, $src, $ipproto = "inet") {
	if (!empty($src) && !empty($int)) {
		$src = trim($src, "[]");
		if (!is_ipaddr($src) && !is_subnet($src)) {
			return gettext("Tried to block invalid IP:") . ' ' . htmlspecialchars($src);
		}
		$int = easyrule_find_rule_interface($int);
		if ($int === false) {
			return gettext("Invalid interface for block rule:") . ' ' . htmlspecialchars($int);
		}
		if (easyrule_block_host_add($src, $int, $ipproto)) {
			return gettext("Host added successfully");
		} else {
			return gettext("Failed to create block rule, alias, or add host.");
		}
	} else {
		return gettext("Tried to block but had no host IP or interface");
	}
	return gettext("Unknown block error.");
}

function easyrule_parse_unblock($int, $host, $ipproto = "inet") {
	global $blockaliasname, $config;

	if (!empty($host) && !empty($int)) {
		$host = trim($host, "[]");
		if (!is_ipaddr($host) && !is_subnet($host)) {
			return gettext("Tried to unblock invalid IP:") . ' ' . htmlspecialchars($host);
		}
		$real_int = easyrule_find_rule_interface($int);
		if ($real_int === false) {
			return gettext("Invalid interface for block rule:") . ' ' . htmlspecialchars($int);
		}

		/* Try to get the ID - will fail if there are no rules/alias on this interface */
		$id = easyrule_block_alias_getid($real_int);
		if ($id === false || !$config['aliases']['alias'][$id]) {
			return gettext("No block rules set on interface:") . ' ' . htmlspecialchars($int);
		}

		$alias = &$config['aliases']['alias'][$id];

		if (is_subnet($host)) {
			list($host, $mask) = explode("/", $host);
		} elseif (is_specialnet($host)) {
			$mask = 0;
		} elseif (is_ipaddrv6($host)) {
			$mask = 128;
		} else {
			$mask = 32;
		}

		// Create the expected string representation
		$unblock = $host.'/'.$mask;

		$a_address = explode(" ", $config['aliases']['alias'][$id]['address']);
		$a_detail = explode("||", $config['aliases']['alias'][$id]['detail']);

		if (($key = array_search($unblock, $a_address)) !== false) {
			unset($a_address[$key]);
			unset($a_detail[$key]);
			// Write back the result to the config array
			$config['aliases']['alias'][$id]['address'] = join(" ", $a_address);
			$config['aliases']['alias'][$id]['detail'] = join("||", $a_detail);

			// Update config
			write_config();
			$retval = filter_configure();
			if (!empty($_SERVER['DOCUMENT_ROOT'])) {
				header("Location: firewall_aliases.php");
				exit;
			} else {
				return gettext("Host unblocked successfully");
			}
		} else {
			return gettext("Host ist not on block list: " . $host);
		}
	}

	return gettext("Tried to unblock but had no host IP or interface");

}

function easyrule_parse_getblock($int = 'wan', $sep = "\n") {
	global $blockaliasname, $config;

	$real_int = easyrule_find_rule_interface($int);
	if ($real_int === false) {
		return gettext("Invalid interface for block rule:") . ' ' . htmlspecialchars($int);
	}

	/* Try to get the ID - will fail if there are no rules/alias on this interface */
	$id = easyrule_block_alias_getid($real_int);

	if ($id === false || !$config['aliases']['alias'][$id] || empty($config['aliases']['alias'][$id]['address'])) {
		return gettext("No block rules set on interface:") . ' ' . htmlspecialchars($int);
	}
	return join($sep, explode(" ", $config['aliases']['alias'][$id]['address']));

}

function easyrule_parse_pass($int, $proto, $src, $dst, $dstport = 0, $ipproto = "inet") {
	/* Check for valid int, srchost, dsthost, dstport, and proto */
	global $protocols_with_ports;
	$src = trim($src, "[]");
	$dst = trim($dst, "[]");

	if (!empty($int) && !empty($proto) && !empty($src) && !empty($dst)) {
		$int = easyrule_find_rule_interface($int);
		if ($int === false) {
			return gettext("Invalid interface for pass rule:") . ' ' . htmlspecialchars($int);
		}
		if (getprotobyname($proto) == -1) {
			return gettext("Invalid protocol for pass rule:") . ' ' . htmlspecialchars($proto);
		}
		if (!is_ipaddr($src) && !is_subnet($src) && !is_ipaddroralias($src) && !is_specialnet($src)) {
			return gettext("Tried to pass invalid source IP:") . ' ' . htmlspecialchars($src);
		}
		if (!is_ipaddr($dst) && !is_subnet($dst) && !is_ipaddroralias($dst) && !is_specialnet($dst)) {
			return gettext("Tried to pass invalid destination IP:") . ' ' . htmlspecialchars($dst);
		}
		if (in_array($proto, $protocols_with_ports)) {
			if (empty($dstport)) {
				return gettext("Missing destination port:") . ' ' . htmlspecialchars($dstport);
			}
			if (!is_port($dstport) && ($dstport != "any")) {
				return gettext("Tried to pass invalid destination port:") . ' ' . htmlspecialchars($dstport);
			}
		} else {
			$dstport = 0;
		}
		/* Should have valid input... */
		if (easyrule_pass_rule_add($int, $proto, $src, $dst, $dstport, $ipproto)) {
			return gettext("Successfully added pass rule!");
		} else {
			return gettext("Failed to add pass rule.");
		}
	} else {
		return gettext("Missing parameters for pass rule.");
	}
	return gettext("Unknown pass error.");
}

?>
OpenPOWER on IntegriCloud