From bf95e292f148f5c42bf834a64e42bf04154403bf Mon Sep 17 00:00:00 2001 From: Matthias Andreas Benkard Date: Tue, 15 Mar 2011 02:01:20 +0100 Subject: Optionally use Hashcash for comment verification. --- COPYING.sha256js | 512 ++++++++++++++++++++++++++++++++++ mulkcms.asd | 3 +- mulkcms.lisp | 88 ++++-- schema.sql | 5 + static-files/js/comment-submission.js | 41 +++ static-files/js/jquery.js | 16 ++ static-files/js/sha256.js | 174 ++++++++++++ templates/article.html | 9 +- templates/journal_page.html | 3 + 9 files changed, 826 insertions(+), 25 deletions(-) create mode 100644 COPYING.sha256js create mode 100644 static-files/js/comment-submission.js create mode 100644 static-files/js/jquery.js create mode 100644 static-files/js/sha256.js diff --git a/COPYING.sha256js b/COPYING.sha256js new file mode 100644 index 0000000..4296afd --- /dev/null +++ b/COPYING.sha256js @@ -0,0 +1,512 @@ +The code in file static-files/js/sha256.js is copyright 2005-2010 Chris +Veness and is distributed according to the GNU LGPL, version 2.1. + +For more information, see: +http://www.movable-type.co.uk/scripts/sha256.html + +The GNU LGPLv2.1 is reproduced below for your reference. + +----------------------------------------------------------------------- + + GNU LESSER GENERAL PUBLIC LICENSE + Version 2.1, February 1999 + + Copyright (C) 1991, 1999 Free Software Foundation, Inc. + 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + Everyone is permitted to copy and distribute verbatim copies + of this license document, but changing it is not allowed. + +[This is the first released version of the Lesser GPL. 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See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with this library; if not, write to the Free Software + Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + +Also add information on how to contact you by electronic and paper mail. + +You should also get your employer (if you work as a programmer) or your +school, if any, to sign a "copyright disclaimer" for the library, if +necessary. Here is a sample; alter the names: + + Yoyodyne, Inc., hereby disclaims all copyright interest in the + library `Frob' (a library for tweaking knobs) written by James Random Hacker. + + , 1 April 1990 + Ty Coon, President of Vice + +That's all there is to it! diff --git a/mulkcms.asd b/mulkcms.asd index 97520b8..13f0bc6 100644 --- a/mulkcms.asd +++ b/mulkcms.asd @@ -9,7 +9,8 @@ :serial t :version "0.0.1" :depends-on (:cl-who :cl-json :alexandria :postmodern :split-sequence - :cl-ppcre :cl-fad :cxml :closure-html :json-template :cxml-stp) + :cl-ppcre :cl-fad :cxml :closure-html :json-template :cxml-stp + :ironclad :flexi-streams) :components ((:file "package") (:file "site") (:file "mulkcms") diff --git a/mulkcms.lisp b/mulkcms.lisp index 3bef1f5..40bfc92 100644 --- a/mulkcms.lisp +++ b/mulkcms.lisp @@ -29,6 +29,11 @@ (random #x1000000000000))) +(defun hashcash-hash-validp (text) + (let ((digest (ironclad:digest-sequence 'ironclad:sha256 (flexi-streams:string-to-octets text)))) + (every #'zerop (subseq digest 0 2)))) + + (defun find-canonical-article-alias (article) (query "SELECT alias FROM article_aliases WHERE article = $1 LIMIT 1" article @@ -133,16 +138,18 @@ :submit-button-label "Submit" :title "Submit a comment" :notes "

Note: - This website uses Akismet + This website uses Akismet for spam detection. E-mail addresses are never - disclosed to - anyone (including Akismet) - other than the site owner. - Comment format is plain - text. Use blank lines to - separate paragraphs.

" + disclosed to anyone (including + Akismet) other than + the site owner. Comment + format is plain text. Use + blank lines to separate + paragraphs.

" :action (link-to :post-comment :article-id article))) :edit-link (link-to :edit :article-id article) :edit-button-label "Edit" @@ -665,12 +672,18 @@ :link "")) (submission-notice nil)) (when (assoc "post-comment" params :test #'equal) - (let ((name (cdr (assoc "name" params :test #'equal))) - (website (cdr (assoc "website" params :test #'equal))) - (email (cdr (assoc "email" params :test #'equal))) - (body (cdr (assoc "body" params :test #'equal))) - (article (cdr (assoc "article" params :test #'equal))) - (revision (cdr (assoc "revision" params :test #'equal)))) + (let* ((name (cdr (assoc "name" params :test #'equal))) + (website (cdr (assoc "website" params :test #'equal))) + (email (cdr (assoc "email" params :test #'equal))) + (body (cdr (assoc "body" params :test #'equal))) + (article (cdr (assoc "article" params :test #'equal))) + (revision (cdr (assoc "revision" params :test #'equal))) + (tkey (cdr (assoc "transaction-key" params :test #'equal))) + (salt (cdr (assoc "salt" params :test #'equal))) + (spam-p (or (null tkey) + (null salt) + (not (hashcash-hash-validp + (format nil "~A:~A:~A" body tkey salt)))))) (with-transaction () (let ((comment (query "INSERT INTO comments(article, global_id) VALUES ($1, $2) @@ -685,22 +698,44 @@ email website :single!))) + (when tkey + (query "INSERT INTO used_transaction_keys(key) VALUES ($1)" + tkey + :none)) (query "INSERT INTO comment_revisions(comment, content, author, format, status, article_revision, submitter_ip, submitter_user_agent) - VALUES ($1, $2, $3, 'text', 'pending', $4, $5, $6)" + VALUES ($1, $2, $3, 'text', $4, $5, $6, $7)" comment body author + (if spam-p + "pending" + "spam") revision (hunchentoot:real-remote-addr) (hunchentoot:user-agent) :none) (setq submission-notice - "

Note:

- -

Your message has been received and put - into the moderation queue. It is now - waiting for approval by one of the site's - administrators.

"))))) + (cond + (spam-p "

Warning:

+ +

Your message could not be + verified as non-spam. If + JavaScript is enabled in your + browser, it may be broken in + some way. In this case, please + disable JavaScript support and + try again. Otherwise, feel free + to contact one of the site + administrators, who will be able + to manually approve your + comment.

") + (t "

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+ +

Your message has been received and + classified as non-spam. It has thus + been put into the moderation queue and + is now awaiting approval by one of the + site's administrators.

"))))))) (expand-page page-template (getf article-params :title) (list* :articles (list article-params) @@ -711,6 +746,14 @@ +(defun find-transaction-key-handler (path) + (when (string= path "RPC/generate-transaction-key") + (lambda () + (with-db + (setf (hunchentoot:content-type*) "text/plain; charset=utf-8") + (format nil "~D" (query "SELECT nextval('transaction_key_seq')" :single!)))))) + + (defun keywordify (thing) (intern (string-upcase (format nil "~A" thing)) "KEYWORD")) @@ -730,4 +773,5 @@ (cond ((assoc "edit" params :test #'equal) :edit) ((assoc "comment-feed" params :test #'equal) :view-comment-feed) ((assoc "atom" params :test #'equal) :view-atom-entry) - (t :view))))) + (t :view))) + (find-transaction-key-handler path))) diff --git a/schema.sql b/schema.sql index 6eb4141..1503a84 100644 --- a/schema.sql +++ b/schema.sql @@ -166,6 +166,11 @@ CREATE TABLE user_settings( FOREIGN KEY ("user") REFERENCES users ); +CREATE TABLE used_transaction_keys( + key BIGINT + PRIMARY KEY (key); +); +CREATE SEQUENCE transaction_key_seq; ---- diff --git a/static-files/js/comment-submission.js b/static-files/js/comment-submission.js new file mode 100644 index 0000000..13c3849 --- /dev/null +++ b/static-files/js/comment-submission.js @@ -0,0 +1,41 @@ +// Copyright 2011, Matthias Andreas Benkard. + +"use strict"; + +jQuery(function($) { + var acceptable_cashhash = function (hash) { + return (hash[0] === '0' && + hash[1] === '0' && + hash[2] === '0' && + hash[3] === '0'); + }; + + var form_augmented_p = false; + $('.comment-form').submit(function() { + var form = $(this); + $.ajax({ + url: "/RPC/generate-transaction-key", + dataType: 'json', + success: function(tkey) { + if (!form_augmented_p) { + form.find(':submit').attr("disabled", true); + var salt = 0; + var text = form.find('textarea'); + while (!acceptable_cashhash(Sha256.hash(text + ":" + tkey + ":" + salt))) { + salt++; + } + form.prepend(''); + form.prepend(''); + form_augmented_p = true; + form.submit(); + return false; + } else { + return true; + } + } + }); + return false; + }); + $('.spam-detection-method').text("Hashcash"); + $('.irrelevant-for-hashcash').text(''); +}); diff --git a/static-files/js/jquery.js b/static-files/js/jquery.js new file mode 100644 index 0000000..6437874 --- /dev/null +++ b/static-files/js/jquery.js @@ -0,0 +1,16 @@ +/*! 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\ No newline at end of file diff --git a/static-files/js/sha256.js b/static-files/js/sha256.js new file mode 100644 index 0000000..a98498d --- /dev/null +++ b/static-files/js/sha256.js @@ -0,0 +1,174 @@ +/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */ +/* SHA-256 implementation in JavaScript | (c) Chris Veness 2002-2010 | www.movable-type.co.uk */ +/* - see http://csrc.nist.gov/groups/ST/toolkit/secure_hashing.html */ +/* http://csrc.nist.gov/groups/ST/toolkit/examples.html */ +/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */ + +var Sha256 = {}; // Sha256 namespace + +/** + * Generates SHA-256 hash of string + * + * @param {String} msg String to be hashed + * @param {Boolean} [utf8encode=true] Encode msg as UTF-8 before generating hash + * @returns {String} Hash of msg as hex character string + */ +Sha256.hash = function(msg, utf8encode) { + utf8encode = (typeof utf8encode == 'undefined') ? true : utf8encode; + + // convert string to UTF-8, as SHA only deals with byte-streams + if (utf8encode) msg = Utf8.encode(msg); + + // constants [§4.2.2] + var K = [0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5, 0x3956c25b, 0x59f111f1, 0x923f82a4, 0xab1c5ed5, + 0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3, 0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174, + 0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc, 0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da, + 0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7, 0xc6e00bf3, 0xd5a79147, 0x06ca6351, 0x14292967, + 0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13, 0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85, + 0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3, 0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070, + 0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5, 0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f, 0x682e6ff3, + 0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208, 0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2]; + // initial hash value [§5.3.1] + var H = [0x6a09e667, 0xbb67ae85, 0x3c6ef372, 0xa54ff53a, 0x510e527f, 0x9b05688c, 0x1f83d9ab, 0x5be0cd19]; + + // PREPROCESSING + + msg += String.fromCharCode(0x80); // add trailing '1' bit (+ 0's padding) to string [§5.1.1] + + // convert string msg into 512-bit/16-integer blocks arrays of ints [§5.2.1] + var l = msg.length/4 + 2; // length (in 32-bit integers) of msg + ‘1’ + appended length + var N = Math.ceil(l/16); // number of 16-integer-blocks required to hold 'l' ints + var M = new Array(N); + + for (var i=0; i>> 32, but since JS converts + // bitwise-op args to 32 bits, we need to simulate this by arithmetic operators + M[N-1][14] = ((msg.length-1)*8) / Math.pow(2, 32); M[N-1][14] = Math.floor(M[N-1][14]) + M[N-1][15] = ((msg.length-1)*8) & 0xffffffff; + + + // HASH COMPUTATION [§6.1.2] + + var W = new Array(64); var a, b, c, d, e, f, g, h; + for (var i=0; i>> n) | (x << (32-n)); } +Sha256.Sigma0 = function(x) { return Sha256.ROTR(2, x) ^ Sha256.ROTR(13, x) ^ Sha256.ROTR(22, x); } +Sha256.Sigma1 = function(x) { return Sha256.ROTR(6, x) ^ Sha256.ROTR(11, x) ^ Sha256.ROTR(25, x); } +Sha256.sigma0 = function(x) { return Sha256.ROTR(7, x) ^ Sha256.ROTR(18, x) ^ (x>>>3); } +Sha256.sigma1 = function(x) { return Sha256.ROTR(17, x) ^ Sha256.ROTR(19, x) ^ (x>>>10); } +Sha256.Ch = function(x, y, z) { return (x & y) ^ (~x & z); } +Sha256.Maj = function(x, y, z) { return (x & y) ^ (x & z) ^ (y & z); } + +// +// hexadecimal representation of a number +// (note toString(16) is implementation-dependant, and +// in IE returns signed numbers when used on full words) +// +Sha256.toHexStr = function(n) { + var s="", v; + for (var i=7; i>=0; i--) { v = (n>>>(i*4)) & 0xf; s += v.toString(16); } + return s; +} + + +/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */ +/* Utf8 class: encode / decode between multi-byte Unicode characters and UTF-8 multiple */ +/* single-byte character encoding (c) Chris Veness 2002-2010 */ +/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */ + +var Utf8 = {}; // Utf8 namespace + +/** + * Encode multi-byte Unicode string into utf-8 multiple single-byte characters + * (BMP / basic multilingual plane only) + * + * Chars in range U+0080 - U+07FF are encoded in 2 chars, U+0800 - U+FFFF in 3 chars + * + * @param {String} strUni Unicode string to be encoded as UTF-8 + * @returns {String} encoded string + */ +Utf8.encode = function(strUni) { + // use regular expressions & String.replace callback function for better efficiency + // than procedural approaches + var strUtf = strUni.replace( + /[\u0080-\u07ff]/g, // U+0080 - U+07FF => 2 bytes 110yyyyy, 10zzzzzz + function(c) { + var cc = c.charCodeAt(0); + return String.fromCharCode(0xc0 | cc>>6, 0x80 | cc&0x3f); } + ); + strUtf = strUtf.replace( + /[\u0800-\uffff]/g, // U+0800 - U+FFFF => 3 bytes 1110xxxx, 10yyyyyy, 10zzzzzz + function(c) { + var cc = c.charCodeAt(0); + return String.fromCharCode(0xe0 | cc>>12, 0x80 | cc>>6&0x3F, 0x80 | cc&0x3f); } + ); + return strUtf; +} + +/** + * Decode utf-8 encoded string back into multi-byte Unicode characters + * + * @param {String} strUtf UTF-8 string to be decoded back to Unicode + * @returns {String} decoded string + */ +Utf8.decode = function(strUtf) { + // note: decode 3-byte chars first as decoded 2-byte strings could appear to be 3-byte char! + var strUni = strUtf.replace( + /[\u00e0-\u00ef][\u0080-\u00bf][\u0080-\u00bf]/g, // 3-byte chars + function(c) { // (note parentheses for precence) + var cc = ((c.charCodeAt(0)&0x0f)<<12) | ((c.charCodeAt(1)&0x3f)<<6) | ( c.charCodeAt(2)&0x3f); + return String.fromCharCode(cc); } + ); + strUni = strUni.replace( + /[\u00c0-\u00df][\u0080-\u00bf]/g, // 2-byte chars + function(c) { // (note parentheses for precence) + var cc = (c.charCodeAt(0)&0x1f)<<6 | c.charCodeAt(1)&0x3f; + return String.fromCharCode(cc); } + ); + return strUni; +} + +/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */ diff --git a/templates/article.html b/templates/article.html index c4ebff4..bd8b10a 100644 --- a/templates/article.html +++ b/templates/article.html @@ -59,7 +59,8 @@

{title}

{notes}
+ enctype="application/x-www-form-urlencoded" method="post" + class="comment-form">
@@ -88,7 +89,11 @@
-
+
+ +
{.end} diff --git a/templates/journal_page.html b/templates/journal_page.html index 2e0ed61..f793ff2 100644 --- a/templates/journal_page.html +++ b/templates/journal_page.html @@ -4,6 +4,9 @@ + + + {.end} {.section body} -- cgit v1.2.3