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Dereck

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  1. Thats incorrect. The script executes fine as is. The goal is to add the functionality where it triggers an error page AND sends logs out. That is why it must include those 2 lines below they say. " Important: This option will only work if you include the code below in your sgerror.php file. This forces the client browser to send a second request to Squid with the denied string in URL. $sge_prefix = (preg_match("/\?/", $cl['u']) ? "&" : "?"); $str[] = '< iframe > src="'. $cl['u'] . $sge_prefix . 'sgr=ACCESSDENIED" width="1" height="1" > < /iframe >'; Hint: You MUST remove extra spaces in the above iframe HTML tags. " The only question I'm asking is where might those 2 lines above in bold logically go in the php script?
  2. I don't know why it strikes out part of the script above. Please just try and ignore it while looking at the issue.
  3. As stated at the beginning, this is a script that works with Squidguard. If you are not familiar with Squid, it is a popular opensource caching and forwarding web proxy. Squidguard is a website blocking program used with Squid. I don't know why it struck out part of the script. I am posting this again. I am currently setting up an instance of SquidGuard which is a site blocker for Squid. In order to get it to log properly to the SIEM, I need to inject some code but have no idea where in the script to put it. First, here is the code it says I need to put in the script: Important: This option will only work if you include the code below in your sgerror.php file. This forces the client browser to send a second request to Squid with the denied string in URL. $sge_prefix = (preg_match("/\?/", $cl['u']) ? "&" : "?"); $str[] = '< iframe > src="'. $cl['u'] . $sge_prefix . 'sgr=ACCESSDENIED" width="1" height="1" > < /iframe >'; Hint: You MUST remove extra spaces in the above iframe HTML tags. Here is the script sgerror.php <?php include "globals.inc"; include "config.inc"; $page_info = <<<EOD /* * sgerror.php * * part of pfSense (https://www.pfsense.org) * Copyright (c) 2017-2021 Rubicon Communications, LLC (Netgate) * Copyright (c) 2006-2011 Serg Dvoriancev * All rights reserved. * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ ---------------------------------------------------------------------------------------------------------------------- SquidGuard error page generator ---------------------------------------------------------------------------------------------------------------------- This program processes redirection requests to specified URL or generated error page for a standard HTTP error code. Redirection supports HTTP and HTTPS protocols. ---------------------------------------------------------------------------------------------------------------------- Format: sgerror.php?url=[http://myurl]or[https://myurl]or[error_code[space_code]output-message][incoming SquidGuard variables] Incoming SquidGuard variables: a=client_address n=client_name i=client_user s=client_group t=target_group u=client_url Example: sgerror.php?url=http://myurl.com&a=..&n=..&i=..&s=..&t=..&u=.. sgerror.php?url=https://myurl.com&a=..&n=..&i=..&s=..&t=..&u=.. sgerror.php?url=404%20output-message&a=..&n=..&i=..&s=..&t=..&u=.. ---------------------------------------------------------------------------------------------------------------------- Tags: myurl and output messages can include Tags [a] - client address [n] - client name - client user - client group [t] - target group - client url Example: sgerror.php?url=401 Unauthorized access to URL for client [n] sgerror.php?url=http://my_error_page.php?cladr=%5Ba%5D&clname=%5Bn%5D // %5b=[ %d=] ---------------------------------------------------------------------------------------------------------------------- Special Tags: blank - get blank page blank_img - get one-pixel transparent image (to replace images such as banners, ads, etc.) Example: sgerror.php?url=blank sgerror.php?url=blank_img ---------------------------------------------------------------------------------------------------------------------- EOD; define('ACTION_URL', 'url'); define('ACTION_RES', 'res'); define('ACTION_MSG', 'msg'); define('TAG_BLANK', 'blank'); define('TAG_BLANK_IMG', 'blank_img'); /* ---------------------------------------------------------------------------------------------------------------------- * ?url=EMPTY_IMG * Use this option to replace banners/ads with a transparent picture. This is better for web page rendering. * ---------------------------------------------------------------------------------------------------------------------- * NULL GIF file * HEX: 47 49 46 38 39 61 - - - * SYM: G I F 8 9 a 01 00 | 01 00 80 00 00 FF FF FF | 00 00 00 2C 00 00 00 00 | 01 00 01 00 00 02 02 44 | 01 00 3B * ---------------------------------------------------------------------------------------------------------------------- */ define('GIF_BODY', "GIF89a\x01\x00\x01\x00\x80\x00\x00\xFF\xFF\xFF\x00\x00\x00\x2C\x00\x00\x00\x00\x01\x00\x01\x00\x00\x02\x02\x44\x01\x00\x3B"); $url = ''; $msg = ''; $cl = Array(); // squidGuard variables: %a %n %i %s %t %u $err_code = array(); $err_code[301] = "301 Moved Permanently"; $err_code[302] = "302 Found"; $err_code[303] = "303 See Other"; $err_code[305] = "305 Use Proxy"; $err_code[400] = "400 Bad Request"; $err_code[401] = "401 Unauthorized"; $err_code[402] = "402 Payment Required"; $err_code[403] = "403 Forbidden"; $err_code[404] = "404 Not Found"; $err_code[405] = "405 Method Not Allowed"; $err_code[406] = "406 Not Acceptable"; $err_code[407] = "407 Proxy Authentication Required"; $err_code[408] = "408 Request Time-out"; $err_code[409] = "409 Conflict"; $err_code[410] = "410 Gone"; $err_code[411] = "411 Length Required"; $err_code[412] = "412 Precondition Failed"; $err_code[413] = "413 Request Entity Too Large"; $err_code[414] = "414 Request-URI Too Large"; $err_code[415] = "415 Unsupported Media Type"; $err_code[416] = "416 Requested range not satisfiable"; $err_code[417] = "417 Expectation Failed"; $err_code[500] = "500 Internal Server Error"; $err_code[501] = "501 Not Implemented"; $err_code[502] = "502 Bad Gateway"; $err_code[503] = "503 Service Unavailable"; $err_code[504] = "504 Gateway Time-out"; $err_code[505] = "505 HTTP Version not supported"; /* ---------------------------------------------------------------------------------------------------------------------- * Functions * ---------------------------------------------------------------------------------------------------------------------- */ function get_page($body) { ?> <html> <body> <?=$body?> </body> </html> <?php } /* * Generate an error page for the user */ function get_error_page($er_code_id, $err_msg='') { global $g, $config, $err_code, $cl; header("HTTP/1.1 " . $err_code[$er_code_id]); ?> <html> <head> <title>squidGuard Error page</title> </head> <body> <?php if ($config['installedpackages']['squidguarddefault']['config'][0]['deniedmessage']): ?> <h3><?= $config['installedpackages']['squidguarddefault']['config'][0]['deniedmessage'] ?>: <?= htmlspecialchars($err_code[$er_code_id]) ?></h3>; <?php else: ?> <h3>Request denied by <?= $g['product_name'] ?> proxy: <?= htmlspecialchars($err_code[$er_code_id]) ?></h3> <?php endif; ?> <?php if ($err_msg): ?> <b>Reason:</b> <?= htmlspecialchars($err_msg) ?> <?php endif; ?> <hr size="1" noshade> <?php if ($cl['a']): ?> <b> Client address: </b> <?= htmlspecialchars($cl['a']) ?><br/> <?php endif; ?> <?php if ($cl['n']): ?> <b> Client name: </b> <?= htmlspecialchars($cl['n']) ?><br/> <?php endif; ?> <?php if ($cl['i']): ?> <b> Client user: </b> <?= htmlspecialchars($cl['i']) ?><br/> <?php endif; ?> <?php if ($cl['s']): ?> <b> Client group: </b> <?= htmlspecialchars($cl['s']) ?><br/> <?php endif; ?> <?php if ($cl['t']): ?> <b> Target group: </b> <?= htmlspecialchars($cl['t']) ?><br/> <?php endif; ?> <?php if ($cl['u']): ?> <b> URL: </b> <?= htmlspecialchars($cl['u']) ?><br/> <?php endif; ?> <hr size="1" noshade> </body> </html> <?php } function get_about() { global $err_code, $page_info; ?> <?= str_replace("\n", "<br/>", $page_info); ?> <br/> <table> <tr><th><b>HTTP error codes (ERROR_CODE):</b></th></tr> <?php foreach ($err_code as $val): ?> <tr><td><?= htmlspecialchars($val) ?></td></tr> <?php endforeach; ?> </table> <?php } /* ---------------------------------------------------------------------------------------------------------------------- * Check arguments * ---------------------------------------------------------------------------------------------------------------------- */ if (count($_REQUEST)) { $url = trim($_REQUEST['url']); $msg = $_REQUEST['msg']; $cl['a'] = $_REQUEST['a']; $cl['n'] = $_REQUEST['n']; $cl['i'] = $_REQUEST['i']; $cl['s'] = $_REQUEST['s']; $cl['t'] = $_REQUEST['t']; $cl['u'] = $_REQUEST['u']; } else { // Show 'About page' echo get_page(get_about()); exit(); } /* ---------------------------------------------------------------------------------------------------------------------- * Process URLs * ---------------------------------------------------------------------------------------------------------------------- */ if ($url) { $err_id = 0; // Check error code foreach ($err_code as $key => $val) { if (strpos(strtolower($url), strval($key)) === 0) { $err_id = $key; break; } } if ($url === TAG_BLANK) { // Output a blank page echo get_page(''); } elseif ($url === TAG_BLANK_IMG) { // Return a blank image header("Content-Type: image/gif;"); // charset=windows-1251"); echo GIF_BODY; } elseif ($err_id !== 0) { // Output an error code $er_msg = strstr($_GET['url'], ' '); echo get_error_page($err_id, $er_msg); } elseif ((strpos(strtolower($url), "http://") === 0) or (strpos(strtolower($url), "https://") === 0)) { // Redirect to the specified url header("HTTP/1.0"); header("Location: $url", '', 302); } else { // Output an error echo get_page("sgerror: error arguments " . htmlspecialchars($url)); } } else { echo get_page($_SERVER['QUERY_STRING']); //$url . implode(" ", $_GET)); // echo get_error_page(500); } Use the button when posting code. I've edited it for you - this time.
  4. Hi All I am currently setting up an instance of SquidGuard which is a site blocker for Squid. In order to get it to log properly to the SIEM, I need to inject some code but have no idea where in the script to put it. First, here is the code it says I need to put in the script: Important: This option will only work if you include the code below in your sgerror.php file. This forces the client browser to send a second request to Squid with the denied string in URL. $sge_prefix = (preg_match("/\?/", $cl['u']) ? "&" : "?"); $str[] = '< iframe > src="'. $cl['u'] . $sge_prefix . 'sgr=ACCESSDENIED" width="1" height="1" > < /iframe >'; Hint: You MUST remove extra spaces in the above iframe HTML tags. Here is the actual script: <?php include "globals.inc"; include "config.inc"; $page_info = <<<EOD /* * sgerror.php * * part of pfSense (https://www.pfsense.org) * Copyright (c) 2017-2021 Rubicon Communications, LLC (Netgate) * Copyright (c) 2006-2011 Serg Dvoriancev * All rights reserved. * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ ---------------------------------------------------------------------------------------------------------------------- SquidGuard error page generator ---------------------------------------------------------------------------------------------------------------------- This program processes redirection requests to specified URL or generated error page for a standard HTTP error code. Redirection supports HTTP and HTTPS protocols. ---------------------------------------------------------------------------------------------------------------------- Format: sgerror.php?url=[http://myurl]or[https://myurl]or[error_code[space_code]output-message][incoming SquidGuard variables] Incoming SquidGuard variables: a=client_address n=client_name i=client_user s=client_group t=target_group u=client_url Example: sgerror.php?url=http://myurl.com&a=..&n=..&i=..&s=..&t=..&u=.. sgerror.php?url=https://myurl.com&a=..&n=..&i=..&s=..&t=..&u=.. sgerror.php?url=404%20output-message&a=..&n=..&i=..&s=..&t=..&u=.. ---------------------------------------------------------------------------------------------------------------------- Tags: myurl and output messages can include Tags [a] - client address [n] - client name - client user - client group [t] - target group - client url Example: sgerror.php?url=401 Unauthorized access to URL for client [n] sgerror.php?url=http://my_error_page.php?cladr=%5Ba%5D&clname=%5Bn%5D // %5b=[ %d=] ---------------------------------------------------------------------------------------------------------------------- Special Tags: blank - get blank page blank_img - get one-pixel transparent image (to replace images such as banners, ads, etc.) Example: sgerror.php?url=blank sgerror.php?url=blank_img ---------------------------------------------------------------------------------------------------------------------- EOD; define('ACTION_URL', 'url'); define('ACTION_RES', 'res'); define('ACTION_MSG', 'msg'); define('TAG_BLANK', 'blank'); define('TAG_BLANK_IMG', 'blank_img'); /* ---------------------------------------------------------------------------------------------------------------------- * ?url=EMPTY_IMG * Use this option to replace banners/ads with a transparent picture. This is better for web page rendering. * ---------------------------------------------------------------------------------------------------------------------- * NULL GIF file * HEX: 47 49 46 38 39 61 - - - * SYM: G I F 8 9 a 01 00 | 01 00 80 00 00 FF FF FF | 00 00 00 2C 00 00 00 00 | 01 00 01 00 00 02 02 44 | 01 00 3B * ---------------------------------------------------------------------------------------------------------------------- */ define('GIF_BODY', "GIF89a\x01\x00\x01\x00\x80\x00\x00\xFF\xFF\xFF\x00\x00\x00\x2C\x00\x00\x00\x00\x01\x00\x01\x00\x00\x02\x02\x44\x01\x00\x3B"); $url = ''; $msg = ''; $cl = Array(); // squidGuard variables: %a %n %i %s %t %u $err_code = array(); $err_code[301] = "301 Moved Permanently"; $err_code[302] = "302 Found"; $err_code[303] = "303 See Other"; $err_code[305] = "305 Use Proxy"; $err_code[400] = "400 Bad Request"; $err_code[401] = "401 Unauthorized"; $err_code[402] = "402 Payment Required"; $err_code[403] = "403 Forbidden"; $err_code[404] = "404 Not Found"; $err_code[405] = "405 Method Not Allowed"; $err_code[406] = "406 Not Acceptable"; $err_code[407] = "407 Proxy Authentication Required"; $err_code[408] = "408 Request Time-out"; $err_code[409] = "409 Conflict"; $err_code[410] = "410 Gone"; $err_code[411] = "411 Length Required"; $err_code[412] = "412 Precondition Failed"; $err_code[413] = "413 Request Entity Too Large"; $err_code[414] = "414 Request-URI Too Large"; $err_code[415] = "415 Unsupported Media Type"; $err_code[416] = "416 Requested range not satisfiable"; $err_code[417] = "417 Expectation Failed"; $err_code[500] = "500 Internal Server Error"; $err_code[501] = "501 Not Implemented"; $err_code[502] = "502 Bad Gateway"; $err_code[503] = "503 Service Unavailable"; $err_code[504] = "504 Gateway Time-out"; $err_code[505] = "505 HTTP Version not supported"; /* ---------------------------------------------------------------------------------------------------------------------- * Functions * ---------------------------------------------------------------------------------------------------------------------- */ function get_page($body) { ?> <html> <body> <?=$body?> </body> </html> <?php } /* * Generate an error page for the user */ function get_error_page($er_code_id, $err_msg='') { global $g, $config, $err_code, $cl; header("HTTP/1.1 " . $err_code[$er_code_id]); ?> <html> <head> <title>squidGuard Error page</title> </head> <body> <?php if ($config['installedpackages']['squidguarddefault']['config'][0]['deniedmessage']): ?> <h3><?= $config['installedpackages']['squidguarddefault']['config'][0]['deniedmessage'] ?>: <?= htmlspecialchars($err_code[$er_code_id]) ?></h3>; <?php else: ?> <h3>Request denied by <?= $g['product_name'] ?> proxy: <?= htmlspecialchars($err_code[$er_code_id]) ?></h3> <?php endif; ?> <?php if ($err_msg): ?> <b>Reason:</b> <?= htmlspecialchars($err_msg) ?> <?php endif; ?> <hr size="1" noshade> <?php if ($cl['a']): ?> <b> Client address: </b> <?= htmlspecialchars($cl['a']) ?><br/> <?php endif; ?> <?php if ($cl['n']): ?> <b> Client name: </b> <?= htmlspecialchars($cl['n']) ?><br/> <?php endif; ?> <?php if ($cl['i']): ?> <b> Client user: </b> <?= htmlspecialchars($cl['i']) ?><br/> <?php endif; ?> <?php if ($cl['s']): ?> <b> Client group: </b> <?= htmlspecialchars($cl['s']) ?><br/> <?php endif; ?> <?php if ($cl['t']): ?> <b> Target group: </b> <?= htmlspecialchars($cl['t']) ?><br/> <?php endif; ?> <?php if ($cl['u']): ?> <b> URL: </b> <?= htmlspecialchars($cl['u']) ?><br/> <?php endif; ?> <hr size="1" noshade> </body> </html> <?php } function get_about() { global $err_code, $page_info; ?> <?= str_replace("\n", "<br/>", $page_info); ?> <br/> <table> <tr><th><b>HTTP error codes (ERROR_CODE):</b></th></tr> <?php foreach ($err_code as $val): ?> <tr><td><?= htmlspecialchars($val) ?></td></tr> <?php endforeach; ?> </table> <?php } /* ---------------------------------------------------------------------------------------------------------------------- * Check arguments * ---------------------------------------------------------------------------------------------------------------------- */ if (count($_REQUEST)) { $url = trim($_REQUEST['url']); $msg = $_REQUEST['msg']; $cl['a'] = $_REQUEST['a']; $cl['n'] = $_REQUEST['n']; $cl['i'] = $_REQUEST['i']; $cl['s'] = $_REQUEST['s']; $cl['t'] = $_REQUEST['t']; $cl['u'] = $_REQUEST['u']; } else { // Show 'About page' echo get_page(get_about()); exit(); } /* ---------------------------------------------------------------------------------------------------------------------- * Process URLs * ---------------------------------------------------------------------------------------------------------------------- */ if ($url) { $err_id = 0; // Check error code foreach ($err_code as $key => $val) { if (strpos(strtolower($url), strval($key)) === 0) { $err_id = $key; break; } } if ($url === TAG_BLANK) { // Output a blank page echo get_page(''); } elseif ($url === TAG_BLANK_IMG) { // Return a blank image header("Content-Type: image/gif;"); // charset=windows-1251"); echo GIF_BODY; } elseif ($err_id !== 0) { // Output an error code $er_msg = strstr($_GET['url'], ' '); echo get_error_page($err_id, $er_msg); } elseif ((strpos(strtolower($url), "http://") === 0) or (strpos(strtolower($url), "https://") === 0)) { // Redirect to the specified url header("HTTP/1.0"); header("Location: $url", '', 302); } else { // Output an error echo get_page("sgerror: error arguments " . htmlspecialchars($url)); } } else { echo get_page($_SERVER['QUERY_STRING']); //$url . implode(" ", $_GET)); // echo get_error_page(500);
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