From 52630374e535692d67fe01f782ef137d5886bb10 Mon Sep 17 00:00:00 2001 From: Sebastien SAUVAGE Date: Sat, 21 Apr 2012 21:59:45 +0200 Subject: [PATCH] Initial commit of version 0.15 alpha. --- README | 33 + index.php | 339 ++++++++ lib/base64.js | 128 +++ lib/busy.gif | Bin 0 -> 671 bytes lib/icon_clone.png | Bin 0 -> 391 bytes lib/icon_new.png | Bin 0 -> 209 bytes lib/icon_send.png | Bin 0 -> 261 bytes lib/icon_shorten.png | Bin 0 -> 262 bytes lib/jquery.js | 4 + lib/rain.tpl.class.php | 1043 ++++++++++++++++++++++++ lib/rawdeflate.js | 1671 +++++++++++++++++++++++++++++++++++++++ lib/rawinflate.js | 753 ++++++++++++++++++ lib/sjcl.js | 41 + lib/vizhash_gd_zero.php | 158 ++++ lib/zerobin.css | 357 +++++++++ lib/zerobin.js | 364 +++++++++ tpl/page.html | 81 ++ 17 files changed, 4972 insertions(+) create mode 100644 README create mode 100644 index.php create mode 100644 lib/base64.js create mode 100644 lib/busy.gif create mode 100644 lib/icon_clone.png create mode 100644 lib/icon_new.png create mode 100644 lib/icon_send.png create mode 100644 lib/icon_shorten.png create mode 100644 lib/jquery.js create mode 100644 lib/rain.tpl.class.php create mode 100644 lib/rawdeflate.js create mode 100644 lib/rawinflate.js create mode 100644 lib/sjcl.js create mode 100644 lib/vizhash_gd_zero.php create mode 100644 lib/zerobin.css create mode 100644 lib/zerobin.js create mode 100644 tpl/page.html diff --git a/README b/README new file mode 100644 index 0000000..0093bca --- /dev/null +++ b/README @@ -0,0 +1,33 @@ +ZeroBin 0.15 Alpha +=== THIS IS ALPHA SOFTWARE - USE AT YOUR OWN RISKS ==== + +ZeroBin is a minimalist, opensource online pastebin where the server +has zero knowledge of pasted data. Data is encrypted/decrypted in the +browser using 256 bits AES. + +More information on the project page: +http://sebsauvage.net/wiki/doku.php?id=php:zerobin + +------------------------------------------------------------------------------ + +Copyright (c) 2012 Sébastien SAUVAGE (sebsauvage.net) + +This software is provided 'as-is', without any express or implied warranty. +In no event will the authors be held liable for any damages arising from +the use of this software. + +Permission is granted to anyone to use this software for any purpose, +including commercial applications, and to alter it and redistribute it +freely, subject to the following restrictions: + + 1. The origin of this software must not be misrepresented; you must + not claim that you wrote the original software. If you use this + software in a product, an acknowledgment in the product documentation + would be appreciated but is not required. + + 2. Altered source versions must be plainly marked as such, and must + not be misrepresented as being the original software. + + 3. This notice may not be removed or altered from any source distribution. + +------------------------------------------------------------------------------ diff --git a/index.php b/index.php new file mode 100644 index 0000000..575b251 --- /dev/null +++ b/index.php @@ -0,0 +1,339 @@ +"); + chmod($tfilename,0705); + } + require $tfilename; + $tl=$GLOBALS['trafic_limiter']; + if (!empty($tl[$ip]) && ($tl[$ip]+10>=time())) + { + return false; + // FIXME: purge file of expired IPs to keep it small + } + $tl[$ip]=time(); + file_put_contents($tfilename, ""); + return true; +} + +/* Convert paste id to storage path. + The idea is to creates subdirectories in order to limit the number of files per directory. + (A high number of files in a single directory can slow things down.) + eg. "f468483c313401e8" will be stored in "data/f4/68/f468483c313401e8" + High-trafic websites may want to deepen the directory structure (like Squid does). + + eg. input 'e3570978f9e4aa90' --> output 'data/e3/57/' +*/ +function dataid2path($dataid) +{ + return 'data/'.substr($dataid,0,2).'/'.substr($dataid,2,2).'/'; +} + +/* Convert paste id to discussion storage path. + eg. 'e3570978f9e4aa90' --> 'data/e3/57/e3570978f9e4aa90.discussion/' +*/ +function dataid2discussionpath($dataid) +{ + return dataid2path($dataid).$dataid.'.discussion/'; +} + +// Checks if a json string is a proper SJCL encrypted message. +// False if format is incorrect. +function validSJCL($jsonstring) +{ + $accepted_keys=array('iv','salt','ct'); + + // Make sure content is valid json + $decoded = json_decode($jsonstring); + if ($decoded==null) return false; + $decoded = (array)$decoded; + + // Make sure required fields are present and that they are base64 data. + foreach($accepted_keys as $k) + { + if (!array_key_exists($k,$decoded)) { return false; } + if (base64_decode($decoded[$k],$strict=true)==null) { return false; } + } + + // Make sure no additionnal keys were added. + if (count(array_intersect(array_keys($decoded),$accepted_keys))!=3) { return false; } + + // FIXME: Reject data if entropy is too low ? + + // Make sure some fields have a reasonable size. + if (strlen($decoded['iv'])>24) return false; + if (strlen($decoded['salt'])>14) return false; + return true; +} + +// Delete a paste and its discussion. +// Input: $pasteid : the paste identifier. +function deletePaste($pasteid) +{ + // Delete the paste itself + unlink(dataid2path($pasteid).$pasteid); + + // Delete discussion if it exists. + $discdir = dataid2discussionpath($pasteid); + if (is_dir($discdir)) + { + // Delete all files in discussion directory + $dhandle = opendir($discdir); + while (false !== ($filename = readdir($dhandle))) + { + if (is_file($discdir.$filename)) unlink($discdir.$filename); + } + closedir($dhandle); + + // Delete the discussion directory. + rmdir($discdir); + } +} + +if (!empty($_POST['data'])) // Create new paste/comment +{ + /* POST contains: + data (mandatory) = json encoded SJCL encrypted text (containing keys: iv,salt,ct) + + All optional data will go to meta information: + expire (optional) = expiration delay (never,10min,1hour,1day,1month,1year,burn) (default:never) + opendiscusssion (optional) = is the discussion allowed on this paste ? (0/1) (default:0) + nickname (optional) = son encoded SJCL encrypted text nickname of author of comment (containing keys: iv,salt,ct) + parentid (optional) = in discussion, which comment this comment replies to. + pasteid (optional) = in discussion, which paste this comment belongs to. + */ + + header('Content-type: application/json'); + $error = false; + + // Create storage directory if it does not exist. + if (!is_dir('data')) + { + mkdir('data',0705); + file_put_contents('data/.htaccess',"Allow from none\nDeny from all\n"); + } + + // Make sure last paste from the IP address was more than 10 seconds ago. + if (!trafic_limiter_canPass($_SERVER['REMOTE_ADDR'])) + { echo json_encode(array('status'=>1,'message'=>'Please wait 10 seconds between each post.')); exit; } + + // Make sure content is not too big. + $data = $_POST['data']; + if (strlen($data)>2000000) + { echo json_encode(array('status'=>1,'message'=>'Paste is limited to 2 Mb of encrypted data.')); exit; } + + // Make sure format is correct. + if (!validSJCL($data)) + { echo json_encode(array('status'=>1,'message'=>'Invalid data.')); exit; } + + // Read additional meta-information. + $meta=array(); + + // Read expiration date + if (!empty($_POST['expire'])) + { + $expire=$_POST['expire']; + if ($expire=='10min') $meta['expire_date']=time()+10*60; + elseif ($expire=='1hour') $meta['expire_date']=time()+60*60; + elseif ($expire=='1day') $meta['expire_date']=time()+24*60*60; + elseif ($expire=='1month') $meta['expire_date']=time()+30*24*60*60; // Well this is not *exactly* one month, it's 30 days. + elseif ($expire=='1year') $meta['expire_date']=time()+365*24*60*60; + elseif ($expire=='burn') $meta['burnafterreading']=true; + } + + // Read open discussion flag + if (!empty($_POST['opendiscussion'])) + { + $opendiscussion = $_POST['opendiscussion']; + if ($opendiscussion!='0' && $opendiscussion!='1') { $error=true; } + if ($opendiscussion!='0') { $meta['opendiscussion']=true; } + } + + // You can't have an open discussion on a "Burn after reading" paste: + if (isset($meta['burnafterreading'])) unset($meta['opendiscussion']); + + // Optional nickname for comments + if (!empty($_POST['nickname'])) + { + $nick = $_POST['nickname']; + if (!validSJCL($nick)) + { + $error=true; + } + else + { + $meta['nickname']=$nick; + + // Generation of the anonymous avatar (Vizhash): + // If a nickname is provided, we generate a Vizhash. + // (We assume that if the user did not enter a nickname, he/she wants + // to be anonymous and we will not generate the vizhash.) + $vz = new vizhash16x16(); + $pngdata = $vz->generate($_SERVER['REMOTE_ADDR']); + if ($pngdata!='') $meta['vizhash'] = 'data:image/png;base64,'.base64_encode($pngdata); + // Once the avatar is generated, we do not keep the IP address, nor its hash. + } + } + + if ($error) + { + echo json_encode(array('status'=>1,'message'=>'Invalid data.')); + exit; + } + + // Add post date to meta. + $meta['postdate']=time(); + + // We just want a small hash to avoid collisions: Half-MD5 (64 bits) will do the trick + $dataid = substr(hash('md5',$data),0,16); + + $is_comment = (!empty($_POST['parentid']) && !empty($_POST['pasteid'])); // Is this post a comment ? + $storage = array('data'=>$data); + if (count($meta)>0) $storage['meta'] = $meta; // Add meta-information only if necessary. + + if ($is_comment) // The user posts a comment. + { + $pasteid = $_POST['pasteid']; + $parentid = $_POST['parentid']; + if (!preg_match('/[a-f\d]{16}/',$pasteid)) { echo json_encode(array('status'=>1,'message'=>'Invalid data.')); exit; } + if (!preg_match('/[a-f\d]{16}/',$parentid)) { echo json_encode(array('status'=>1,'message'=>'Invalid data.')); exit; } + + unset($storage['expire_date']); // Comment do not expire (it's the paste that expires) + unset($storage['opendiscussion']); + + // Make sure paste exists. + $storagedir = dataid2path($pasteid); + if (!is_file($storagedir.$pasteid)) { echo json_encode(array('status'=>1,'message'=>'Invalid data.')); exit; } + + // Make sure the discussion is opened in this paste. + $paste=json_decode(file_get_contents($storagedir.$pasteid)); + if (!$paste->meta->opendiscussion) { echo json_encode(array('status'=>1,'message'=>'Invalid data.')); exit; } + + $discdir = dataid2discussionpath($pasteid); + $filename = $pasteid.'.'.$dataid.'.'.$parentid; + if (!is_dir($discdir)) mkdir($discdir,$mode=0705,$recursive=true); + if (is_file($discdir.$filename)) // Oups... improbable collision. + { + echo json_encode(array('status'=>1,'message'=>'You are unlucky. Try again.')); + exit; + } + + file_put_contents($discdir.$filename,json_encode($storage)); + echo json_encode(array('status'=>0,'id'=>$dataid)); // 0 = no error + exit; + } + else // a standard paste. + { + $storagedir = dataid2path($dataid); + if (!is_dir($storagedir)) mkdir($storagedir,$mode=0705,$recursive=true); + if (is_file($storagedir.$dataid)) // Oups... improbable collision. + { + echo json_encode(array('status'=>1,'message'=>'You are unlucky. Try again.')); + exit; + } + // New paste + file_put_contents($storagedir.$dataid,json_encode($storage)); + echo json_encode(array('status'=>0,'id'=>$dataid)); // 0 = no error + exit; + } + +echo json_encode(array('status'=>1,'message'=>'Server error.')); +exit; +} + +$CIPHERDATA=''; +$ERRORMESSAGE=''; +if (!empty($_SERVER['QUERY_STRING'])) // Display an existing paste. +{ + $dataid = $_SERVER['QUERY_STRING']; + if (preg_match('/[a-f\d]{16}/',$dataid)) // Is this a valid paste identifier ? + { + $filename = dataid2path($dataid).$dataid; + if (is_file($filename)) // Check that paste exists. + { + // Get the paste itself. + $paste=json_decode(file_get_contents($filename)); + + // See if paste has expired. + if (isset($paste->meta->expire_date) && $paste->meta->expire_datemeta->expire_date) $paste->meta->remaining_time = $paste->meta->expire_date - time(); + + $messages = array($paste); // The paste itself is the first in the list of encrypted messages. + // If it's a discussion, get all comments. + if ($paste->meta->opendiscussion) + { + $comments=array(); + $datadir = dataid2discussionpath($dataid); + if (!is_dir($datadir)) mkdir($datadir,$mode=0705,$recursive=true); + $dhandle = opendir($datadir); + while (false !== ($filename = readdir($dhandle))) + { + if (is_file($datadir.$filename)) + { + $comment=json_decode(file_get_contents($datadir.$filename)); + // Filename is in the form pasteid.commentid.parentid: + // - pasteid is the paste this reply belongs to. + // - commentid is the comment identifier itself. + // - parentid is the comment this comment replies to (It can be pasteid) + $items=explode('.',$filename); + $comment->meta->commentid=$items[1]; // Add some meta information not contained in file. + $comment->meta->parentid=$items[2]; + $comments[$comment->meta->postdate]=$comment; // Store in table + } + } + closedir($dhandle); + ksort($comments); // Sort comments by date, oldest first. + $messages = array_merge($messages, $comments); + } + $CIPHERDATA = json_encode($messages); + + // If the paste was meant to be read only once, delete it. + if ($paste->meta->burnafterreading) deletePaste($dataid); + } + } + else + { + $ERRORMESSAGE='Paste does not exist or has expired.'; + } + } +} + + +require_once "lib/rain.tpl.class.php"; +header('Content-Type: text/html; charset=utf-8'); +$page = new RainTPL; +$page->assign('CIPHERDATA',htmlspecialchars($CIPHERDATA,ENT_NOQUOTES)); // We escape it here because ENT_NOQUOTES can't be used in RainTPL templates. +$page->assign('VERSION',$VERSION); +$page->assign('ERRORMESSAGE',$ERRORMESSAGE); +$page->draw('page'); +?> \ No newline at end of file diff --git a/lib/base64.js b/lib/base64.js new file mode 100644 index 0000000..5e19770 --- /dev/null +++ b/lib/base64.js @@ -0,0 +1,128 @@ +/* + * $Id: base64.js,v 1.2 2011/12/27 14:34:49 dankogai Exp dankogai $ + * + * Licensed under the MIT license. + * http://www.opensource.org/licenses/mit-license.php + * + */ + +(function(global){ + +if (global.Base64) return; + +var b64chars + = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/'; +var b64tab = function(bin){ + var t = {}; + for (var i = 0, l = bin.length; i < l; i++) t[bin.charAt(i)] = i; + return t; +}(b64chars); + +var sub_toBase64 = function(m){ + var n = (m.charCodeAt(0) << 16) + | (m.charCodeAt(1) << 8) + | (m.charCodeAt(2) ); + return b64chars.charAt( n >>> 18) + + b64chars.charAt((n >>> 12) & 63) + + b64chars.charAt((n >>> 6) & 63) + + b64chars.charAt( n & 63); +}; + +var toBase64 = function(bin){ + if (bin.match(/[^\x00-\xFF]/)) throw 'unsupported character found' ; + var padlen = 0; + while(bin.length % 3) { + bin += '\0'; + padlen++; + }; + var b64 = bin.replace(/[\x00-\xFF]{3}/g, sub_toBase64); + if (!padlen) return b64; + b64 = b64.substr(0, b64.length - padlen); + while(padlen--) b64 += '='; + return b64; +}; + +var btoa = global.btoa || toBase64; + +var sub_fromBase64 = function(m){ + var n = (b64tab[ m.charAt(0) ] << 18) + | (b64tab[ m.charAt(1) ] << 12) + | (b64tab[ m.charAt(2) ] << 6) + | (b64tab[ m.charAt(3) ]); + return String.fromCharCode( n >> 16 ) + + String.fromCharCode( (n >> 8) & 0xff ) + + String.fromCharCode( n & 0xff ); +}; + +var fromBase64 = function(b64){ + b64 = b64.replace(/[^A-Za-z0-9\+\/]/g, ''); + var padlen = 0; + while(b64.length % 4){ + b64 += 'A'; + padlen++; + } + var bin = b64.replace(/[A-Za-z0-9\+\/]{4}/g, sub_fromBase64); + if (padlen >= 2) + bin = bin.substring(0, bin.length - [0,0,2,1][padlen]); + return bin; +}; + +var atob = global.atob || fromBase64; + +var re_char_nonascii = /[^\x00-\x7F]/g; + +var sub_char_nonascii = function(m){ + var n = m.charCodeAt(0); + return n < 0x800 ? String.fromCharCode(0xc0 | (n >>> 6)) + + String.fromCharCode(0x80 | (n & 0x3f)) + : String.fromCharCode(0xe0 | ((n >>> 12) & 0x0f)) + + String.fromCharCode(0x80 | ((n >>> 6) & 0x3f)) + + String.fromCharCode(0x80 | (n & 0x3f)) + ; +}; + +var utob = function(uni){ + return uni.replace(re_char_nonascii, sub_char_nonascii); +}; + +var re_bytes_nonascii + = /[\xC0-\xDF][\x80-\xBF]|[\xE0-\xEF][\x80-\xBF]{2}|[\xF0-\xF7][\x80-\xBF]{3}/g; + +var sub_bytes_nonascii = function(m){ + var c0 = m.charCodeAt(0); + var c1 = m.charCodeAt(1); + if(c0 < 0xe0){ + return String.fromCharCode(((c0 & 0x1f) << 6) | (c1 & 0x3f)); + }else{ + var c2 = m.charCodeAt(2); + return String.fromCharCode( + ((c0 & 0x0f) << 12) | ((c1 & 0x3f) << 6) | (c2 & 0x3f) + ); + } +}; + +var btou = function(bin){ + return bin.replace(re_bytes_nonascii, sub_bytes_nonascii); +}; + +global.Base64 = { + fromBase64:fromBase64, + toBase64:toBase64, + atob:atob, + btoa:btoa, + utob:utob, + btou:btou, + encode:function(u){ return btoa(utob(u)) }, + encodeURI:function(u){ + return btoa(utob(u)).replace(/[+\/]/g, function(m0){ + return m0 == '+' ? 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