From 73c6f40ebc0d42606c3c441fc666f586b34308c9 Mon Sep 17 00:00:00 2001 From: Zach Prezkuta Date: Sat, 16 Jun 2012 23:58:22 -0600 Subject: [PATCH] create new signed text for relayables right when relaying them --- include/diaspora.php | 80 ++++++++++++++++---------------------------- 1 file changed, 28 insertions(+), 52 deletions(-) diff --git a/include/diaspora.php b/include/diaspora.php index 2be266e8a..0ca9163a8 100755 --- a/include/diaspora.php +++ b/include/diaspora.php @@ -2150,7 +2150,7 @@ function diaspora_send_followup($item,$owner,$contact,$public_batch = false) { $a = get_app(); $myaddr = $owner['nickname'] . '@' . substr($a->get_baseurl(), strpos($a->get_baseurl(),'://') + 3); - $theiraddr = $contact['addr']; +// $theiraddr = $contact['addr']; // The first item in the `item` table with the parent id is the parent. However, MySQL doesn't always // return the items ordered by `item`.`id`, in which case the wrong item is chosen as the parent. @@ -2213,7 +2213,10 @@ function diaspora_send_relay($item,$owner,$contact,$public_batch = false) { $a = get_app(); $myaddr = $owner['nickname'] . '@' . substr($a->get_baseurl(), strpos($a->get_baseurl(),'://') + 3); - $theiraddr = $contact['addr']; +// $theiraddr = $contact['addr']; + + $body = $item['body']; + $text = html_entity_decode(bb2diaspora($body)); // The first item in the `item` table with the parent id is the parent. However, MySQL doesn't always @@ -2232,26 +2235,30 @@ function diaspora_send_relay($item,$owner,$contact,$public_batch = false) { $relay_retract = false; $sql_sign_id = 'iid'; if( $item['deleted']) { - $tpl = get_markup_template('diaspora_relayable_retraction.tpl'); $relay_retract = true; - $sql_sign_id = 'retract_iid'; + $target_type = ( ($item['verb'] === ACTIVITY_LIKE) ? 'Like' : 'Comment'); + $sender_signed_text = $item['guid'] . ';' . $target_type ; + + $sql_sign_id = 'retract_iid'; + $tpl = get_markup_template('diaspora_relayable_retraction.tpl'); } elseif($item['verb'] === ACTIVITY_LIKE) { - $tpl = get_markup_template('diaspora_like_relay.tpl'); $like = true; + $target_type = 'Post'; // $positive = (($item['deleted']) ? 'false' : 'true'); $positive = 'true'; + $sender_signed_text = $item['guid'] . ';' . $target_type . ';' . $parent_guid . ';' . $positive . ';' . $myaddr; + + $tpl = get_markup_template('diaspora_like_relay.tpl'); } - else { + else { // item is a comment + $sender_signed_text = $item['guid'] . ';' . $parent_guid . ';' . $text . ';' . $myaddr; + $tpl = get_markup_template('diaspora_comment_relay.tpl'); } - $body = $item['body']; - - $text = html_entity_decode(bb2diaspora($body)); - // fetch the original signature if the relayable was created by a Diaspora // or DFRN user. Relayables for other networks are not supported. @@ -2272,51 +2279,20 @@ function diaspora_send_relay($item,$owner,$contact,$public_batch = false) { // function is called logger('diaspora_send_relay: original author signature not found, cannot send relayable'); return; -/* - $itemcontact = q("select * from contact where `id` = %d limit 1", - intval($item['contact-id']) - ); - if(count($itemcontact)) { - if(! $itemcontact[0]['self']) { - $prefix = sprintf( t('[Relayed] Comment authored by %s from network %s'), - '['. $item['author-name'] . ']' . '(' . $item['author-link'] . ')', - network_to_name($itemcontact['network'])) . "\n"; - // "$body" was assigned to "$text" above. It isn't used after that, so I don't think - // the following change will do anything - $body = $prefix . $body; - - // I think this comment will fail upon reaching Diaspora, because "$signed_text" is not defined - } - } - else { - // I'm confused about this "else." Since it sets "$handle = $myaddr," it seems like it should be for the case - // where the top-level post owner commented on his own post, i.e. "$itemcontact[0]['self']" is true. But it's - // positioned to be for the case where "count($itemcontact)" is 0. - - $handle = $myaddr; - - if($like) - $signed_text = $item['guid'] . ';' . $target_type . ';' . $parent_guid . ';' . $positive . ';' . $handle; - elseif($relay_retract) - $signed_text = $item['guid'] . ';' . $target_type; - else - $signed_text = $item['guid'] . ';' . $parent_guid . ';' . $text . ';' . $handle; - - $authorsig = base64_encode(rsa_sign($signed_text,$owner['uprvkey'],'sha256')); - - q("insert into sign (`" . $sql_sign_id . "`,`signed_text`,`signature`,`signer`) values (%d,'%s','%s','%s') ", - intval($item['id']), - dbesc($signed_text), - dbesc($authorsig), - dbesc($handle) - ); - } -*/ } - // sign it with the top-level owner's signature + // Sign the relayable with the top-level owner's signature + // + // We'll use the $sender_signed_text that we just created, instead of the $signed_text + // stored in the database, because that provides the best chance that Diaspora will + // be able to reconstruct the signed text the same way we did. This is particularly a + // concern for the comment, whose signed text includes the text of the comment. The + // smallest change in the text of the comment, including removing whitespace, will + // make the signature verification fail. Since we translate from BB code to Diaspora's + // markup at the top of this function, which is AFTER we placed the original $signed_text + // in the database, it's hazardous to trust the original $signed_text. - $parentauthorsig = base64_encode(rsa_sign($signed_text,$owner['uprvkey'],'sha256')); + $parentauthorsig = base64_encode(rsa_sign($sender_signed_text,$owner['uprvkey'],'sha256')); $msg = replace_macros($tpl,array( '$guid' => xmlify($item['guid']),