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diff --git a/COPYING b/COPYING new file mode 100644 index 000000000..dba13ed2d --- /dev/null +++ b/COPYING @@ -0,0 +1,661 @@ + GNU AFFERO GENERAL PUBLIC LICENSE + Version 3, 19 November 2007 + + Copyright (C) 2007 Free Software Foundation, Inc. <http://fsf.org/> + Everyone is permitted to copy and distribute verbatim copies + of this license document, but changing it is not allowed. + + Preamble + + The GNU Affero General Public License is a free, copyleft license for +software and other kinds of works, specifically designed to ensure +cooperation with the community in the case of network server software. + + The licenses for most software and other practical works are designed +to take away your freedom to share and change the works. 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Remote Network Interaction; Use with the GNU General Public License. + + Notwithstanding any other provision of this License, if you modify the +Program, your modified version must prominently offer all users +interacting with it remotely through a computer network (if your version +supports such interaction) an opportunity to receive the Corresponding +Source of your version by providing access to the Corresponding Source +from a network server at no charge, through some standard or customary +means of facilitating copying of software. This Corresponding Source +shall include the Corresponding Source for any work covered by version 3 +of the GNU General Public License that is incorporated pursuant to the +following paragraph. + + Notwithstanding any other provision of this License, you have +permission to link or combine any covered work with a work licensed +under version 3 of the GNU General Public License into a single +combined work, and to convey the resulting work. 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If the Program does not specify a version number of the +GNU Affero General Public License, you may choose any version ever published +by the Free Software Foundation. + + If the Program specifies that a proxy can decide which future +versions of the GNU Affero General Public License can be used, that proxy's +public statement of acceptance of a version permanently authorizes you +to choose that version for the Program. + + Later license versions may give you additional or different +permissions. However, no additional obligations are imposed on any +author or copyright holder as a result of your choosing to follow a +later version. + + 15. Disclaimer of Warranty. + + THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY +APPLICABLE LAW. EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT +HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY +OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, +THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR +PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM +IS WITH YOU. SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF +ALL NECESSARY SERVICING, REPAIR OR CORRECTION. + + 16. Limitation of Liability. + + IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING +WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS +THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY +GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE +USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF +DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD +PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS), +EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF +SUCH DAMAGES. + + 17. Interpretation of Sections 15 and 16. + + If the disclaimer of warranty and limitation of liability provided +above cannot be given local legal effect according to their terms, +reviewing courts shall apply local law that most closely approximates +an absolute waiver of all civil liability in connection with the +Program, unless a warranty or assumption of liability accompanies a +copy of the Program in return for a fee. + + END OF TERMS AND CONDITIONS + + How to Apply These Terms to Your New Programs + + If you develop a new program, and you want it to be of the greatest +possible use to the public, the best way to achieve this is to make it +free software which everyone can redistribute and change under these terms. + + To do so, attach the following notices to the program. It is safest +to attach them to the start of each source file to most effectively +state the exclusion of warranty; and each file should have at least +the "copyright" line and a pointer to where the full notice is found. + + <one line to give the program's name and a brief idea of what it does.> + Copyright (C) <year> <name of author> + + This program is free software: you can redistribute it and/or modify + it under the terms of the GNU Affero General Public License as published by + the Free Software Foundation, either version 3 of the License, or + (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU Affero General Public License for more details. + + You should have received a copy of the GNU Affero General Public License + along with this program. If not, see <http://www.gnu.org/licenses/>. + +Also add information on how to contact you by electronic and paper mail. + + If your software can interact with users remotely through a computer +network, you should also make sure that it provides a way for users to +get its source. For example, if your program is a web application, its +interface could display a "Source" link that leads users to an archive +of the code. There are many ways you could offer source, and different +solutions will be better for different programs; see section 13 for the +specific requirements. + + You should also get your employer (if you work as a programmer) or school, +if any, to sign a "copyright disclaimer" for the program, if necessary. +For more information on this, and how to apply and follow the GNU AGPL, see +<http://www.gnu.org/licenses/>. diff --git a/README.org b/README.org new file mode 100644 index 000000000..4e4b3740b --- /dev/null +++ b/README.org @@ -0,0 +1,72 @@ +#+TITLE: Vegan, an anti-spam plugin for Elgg 1.8 +#+AUTHOR: Lorea Hackers +#+EMAIL: devel@lorea.org + +* Lorea Vegan +** Inspirations +*** StatusNet +**** http://spamicity.info/ +**** http://status.net/wiki/Spam +** Features +*** Spam-Killing Delegation + + By default only admins can mark accounts as spammers and ban them + on the spot. Vegan brings that feature to selected inhabitants. + +*** Spammer's Recognition + + Vegan smells spammers: + - recent account + - no avatar + - few friends + - empty profile + - abusive friend requests + - send private messages to non-friends + - posts a lot of links + - posts known spam + - posts from RBL-blacklisted origins + - posts a lot in combination of any of the above + - defines an "asocial" type that forces user into CAPTCHA mode + - more content filtering (URLs, federated spam reports) + +*** Conditional Posting + + - requires solving CAPTCHA on first blog post + - requires solving CAPTCHA on submission if "asocial" + - forces "PRIVATE" posting on reported users + +*** Early Warning System + + - sandbox reported users + - requires email confirmation on suspicious activity + +*** Hive Mind Report + + - any user can flag a spammer. The more flags, and the most dense + the reports, the more constraints on the poster. + - after a threshold of user reports, spammer is flagged + automatically and removed. + - user successfully reporting spam get more trust reporting next + spammers, hence reinforce the anti-spam recognition system: + accordingly, users falsely reporting spam receive less trust, + and can be flagged themselves as trolls if they persist in wrong + reports. + - trolls are treated similarly as spammers, but their account and + contents are not destroyed, just suspended. + +*** Fight Human Spammers + + As spammers learn to bypass registration processes by keeping that + part manual, they can throw in several dormant accounts and use + them later. + + - When a spam is successfully reported, the social graph + of the spammer is analyzed and contacts are sanctioned (loss of + trust.) + - When an account is inactive for too long, it is suspended, and + requires a manual email reactivation. Remote accounts not + mentioning an email require admin intervention for reactivation. + + + + diff --git a/activate.php b/activate.php new file mode 100644 index 000000000..3cb9cc40b --- /dev/null +++ b/activate.php @@ -0,0 +1,9 @@ +/** + * vegan -- Activation + */ + +// temp: set default blacklisted email domains (for n-1, YMMV) + +$default_bad_domains = 'aol.com,hotmail.com'; + +elgg_set_plugin_setting('bad_domains', $default_bad_domains, 'vegan'); diff --git a/manifest.xml b/manifest.xml new file mode 100644 index 000000000..e991d8904 --- /dev/null +++ b/manifest.xml @@ -0,0 +1,21 @@ +<?xml version="1.0" encoding="UTF-8"?> +<plugin_manifest xmlns="http://www.elgg.org/plugin_manifest/1.8"> + <name>Vegan</name> + <author>Lorea Faeries</author> + <version>0.0.1</version> + <category>lorea</category> + <category>spam</category> + <category>admin</category> + <description>Meat is murder, spam is rape.</description> + <website>https://lorea.org/plugins/vegan</website> + <repository>https://gitorious.org/lorea/vegan</repository> + <bugtracker></bugtracker> + <donations>https://lorea.org/support</donations> + <copyright>2012,2013 Lorea Faeries (federation@lorea.org)</copyright> + <license>GNU Affero General Public License version 3 or later</license> + <requires> + <type>elgg_release</type> + <version>1.8</version> + </requires> + <activate_on_install>true</activate_on_install> +</plugin_manifest> diff --git a/start.php b/start.php new file mode 100644 index 000000000..cee529e8f --- /dev/null +++ b/start.php @@ -0,0 +1,449 @@ +<?php +/** + * Vegan, an anti-spam plugin for Elgg 1.8 + * + * @author hellekin + * @package lorea + * @subpackage vegan + * @copyright 2012,2013 Lorea Faeries <federation@lorea.org> + * @license GNU Affero General Public License version 3 or later + * @website https://lorea.org/plugins/vegan + * + * Friendly note to spammers: never cross my path. + */ + +elgg_register_event_handler('init', 'system', 'vegan_init'); + +/** + * vegan_init -- Initialize plugin functionality + * + * @return void + */ +function vegan_init() { + + // Register Tests + // elgg_register_plugin_hook_handler('test', 'system', 'vegan_tests'); + + // Provide Admin Interface + elgg_register_event_handler('pagesetup', 'system', 'vegan_admin_sandbox_page_setup'); + elgg_extend_view('admin/user_opt/extend', 'vegan/admin_sandboxed_users'); + elgg_extend_view('css/admin', 'vegan/css_admin'); + + // Extend CSS + elgg_extend_view('elgg', 'css', 'vegan/css'); + + // @todo Replace ReportedContent functionality + + // Hook to registration to block obvious spammers + elgg_register_plugin_hook_handler('register', 'user', 'vegan_blacklist_email'); + + // Hook to entity creation to restrict access to saved objects + elgg_register_event_handler('create', 'group', 'vegan_block_create_group'); + elgg_register_event_handler('create', 'object', 'vegan_block_create_object'); + + // Hook to actions to block spammers from saving objects + $actions = array( + 'blog/save', + 'bookmark/save', + 'thewire/add', + ); + foreach ($actions AS $action) { + elgg_register_plugin_hook_handler('action', $action, 'vegan_block_action'); + } + + // Hook to creating,river to prevent river spam + elgg_register_plugin_hook_handler('creating', 'river', 'vegan_block_river'); + + // @todo clear vegan_sandboxed flag when user joins group/make friends + // make it smart enough to make spammers' job hard to circumvent + +} + +/** + * vegan_block_action -- Prevent spammers from saving anything + * + * @hook Plugin action, *save + * + * @param String $hook the action to block + * @param String $type the entity type (usually object) + * @param Mixed $foo ignored parameter + * @param Mixed $bar ignored parameter + * @return Boolean TRUE if the current user is a recognized spammer, FALSE otherwise. + */ +function vegan_block_action($hook, $type, $foo, $bar) { + + $user_guid = elgg_get_logged_in_user_guid(); + + return vegan_is_spammer($user_guid); + +} + +/** + * vegan_block_create_group -- Force access to ACCESS_PRIVATE for sandboxed users + * + * @hook Event create, group + * + * @param String $event the event (create) + * @param String $type the entity type (group) + * @param Array $params contains 'entity' key + * + * @return Boolean TRUE to allow action, FALSE to prevent it + */ +function vegan_block_create_group($event, $type, $params) { + + $group = $params['entity']; + $guid = $group->owner_guid; + + if ($guid && vegan_is_sandboxed($guid)) { + system_message(elgg_echo('vegan:sandboxed:group')); + $group->set('access_id', ACCESS_PRIVATE); + // Return FALSE to delete group if sandboxed user is a spammer + return !vegan_is_spammer($guid); + } + + return TRUE; // Accept group creation + +} + +/** + * vegan_block_create_object -- Force access to ACCESS_PRIVATE for sandboxed users. + * + * @hook Event create, object + * + * @param String $event the event (create) + * @param String $type the entity type (object) + * @param Array $params contains 'entity' key + * + * @return Boolean TRUE to allow action, FALSE to prevent it + */ +function vegan_block_create_object($event, $type, $params) { + + $object = $params['entity']; + $guid = $object->owner_guid; + + if ($guid && vegan_is_sandboxed($guid)) { + system_message(elgg_echo('vegan:sandboxed:object')); + $object->set('access_id', ACCESS_PRIVATE); + // Return FALSE to delete object if sandboxed user is a spammer + return !vegan_is_spammer($guid); + } + + return TRUE; // Accept object creation + +} + +/** + * vegan_block_river -- Prevent river spam from sandboxed users + * + * @hook Plugin creating,river + * + * @param String $hook the plugin hook (creating) + * @param String $type the entity type (river) + * @param Mixed $foo ignored parameter + * @param Array $values arguments for view + * + * @return Mixed TRUE to prevent item from being sent to the river, void otherwise. + */ +function vegan_block_river($hook, $type, $foo, $values) { + + error_log("===== vegan_block_river $hook,$type ($foo) $values"); + + if (vegan_is_sandboxed($values['subject_guid'])) { + return TRUE; + } + +} + +/** + * vegan_is_sandboxed -- Determine whether to sandbox the user or not + * + * @param Integer $user_guid the GUID of the user entity to test + * + * @return Boolean TRUE if sandboxed, FALSE otherwise. + */ +function vegan_is_sandboxed($user_guid) { + + $sandboxed = FALSE; + + // Get user and current time + $user = get_entity($user_guid); + $now = time(); + + if (!elgg_instanceof($user, 'user')) { + error_log("===== vegan_sandboxed content owner '$user_guid' is not a user!"); + return FALSE; + } + + // Account was activated by email + if ($user->validation_method == 'email') { + + $md = elgg_get_metadata(array( + 'guid' => $user_guid, + 'metadata_name' => 'validated', + 'limit' => 1, + )); + error_log("===== vegan_sandboxed md $md->time_updated"); + + // and less than 2 minutes ago: die motherfucker + if ($user->last_login == 0 && $md && ($now - $md->time_updated) < 120) { + error_log("===== Gotcha! Killing spammer on first post"); + $user->delete(); + $sandboxed = TRUE; // return TRUE to block the river + } + // and less than an hour ago + /* + else if ($md && ($now - $md->updated_at) < 3600) { + error_log("===== vegan_sandboxed recent account"); + $sandboxed = TRUE; + } + */ + + } + + // If it's sandboxed, force ACCESS_PRIVATE + if ($user->vegan_sandboxed) { + // Keep track of retries, for future use + error_log("===== User is sandboxed ({$owner->vegan_sandboxed_tries})"); + $user->vegan_sandboxed_tries = (int)$user->vegan_sandboxed_tries + 1; + $sandboxed = TRUE; + } + + // Skip admins + if (!$user->isAdmin()) { + + // You have zero friends + if (!$user->getFriends()) { + error_log("===== Sandboxed user (no friends)"); + $sandboxed = TRUE; + } + + // You're not cooperating + if (!$user->getGroups()) { + error_log("===== Sandboxed user (no groups)"); + $sandboxed = TRUE; + } + + } + + if ($sandboxed) { + $user->set('vegan_sandboxed', TRUE); + // @todo limit access collections to private + } + + return $sandboxed; + +} + +/** + * vegan_blacklist_email -- Prevent user registration from a notorious + * spam source + * + * Blacklists suck, but enough is enough. + * + * @hook Plugin register, user + * + * @param String $hook the plugin hook (register) + * @param String $type the entity type (user) + * @param Mixed $value the return value + * @param Array $params contains 'user' key + * + * @return FALSE to prevent user registration + */ +function vegan_blacklist_email($hook, $type, $value, $params) { + + // Hardcode forbidden patterns: humans don't use them + static $noway = array( + '/\+.*@hotmail\.com$/', + ); + + // Grab the email + $email = $params['user']->email; + error_log("===== vegan_blacklist_email $hook,$type $email"); + + if (!empty($email)) { + + // Exclude forbidden patterns + foreach($noway AS $pattern) { + if (preg_match($pattern, $email)) { + error_log("===== Vegan prevented registration of $email"); + return FALSE; + } + } + + // Exclude additional site-specific blacklisted domains + $bad_domains = string_to_tag_array(elgg_get_plugin_setting('bad_domains', 'vegan')); + $domain = explode('@', $email, 2); + + error_log("===== Vegan testing $email against " . implode(', ', $bad_domains)); + + if (is_array($bad_domains) && in_array($domain[1], $bad_domains)) { + error_log("===== Vegan prevented registration of $email (bad domain: $domain[1])"); + return FALSE; + } + + } + +} + +/** + * vegan_admin_sandboxed_users -- View and manage suspicious users + * + */ + +/** + * vegan_admin_sandboxed_page_setup -- Provide admin interface + * + */ +function vegan_admin_sandboxed_page_setup() { + if (elgg_get_context() == 'admin' && elgg_is_admin_logged_in()) { + elgg_register_admin_menu_item('administer', 'vegan', 'lorea'); + } +} + +/* +function vegan_strike($hook, $type, $value, $params) { + $report = $params['report']; + $reporter = $report->getOwnerEntity(); + $current_user_guid = elgg_get_loggedin_user_guid(); + if ($reporter->guid == $current_user_guid && $reporter->spam_hunter) { + // Kill the beast + // TODO get reported object owner, or reported user + $spammer_guid = -1; + $spammer = elgg_get_user_entity($spammer_guid); + // Ban + if ($spammer->ban()) { + system_message(elgg_echo('vegan:killed_spammer')); + $report->state = 'archived'; + $report->save(); + } else { + register_error(elgg_echo('vegan:spammer_escaped')); + } + } + +} + + +function vegan_grant_hunter_role($user_guid) { + $user = elgg_get_user($user_guid); + if (elgg_instanceof($user, 'user') && !$user->banned) { + $user->spam_hunter = true; + return TRUE; + } + return FALSE; +} + +function vegan_can_hunt($user = NULL) { + if (!$user) { + $user = elgg_get_loggedin_user(); + } + if (!elgg_instanceof($user, 'user') || $user->banned) { + return FALSE; + } + + return ($user->spam_hunter); +} + + +*/ + +/** + * Vegan Reporting functions + * + * Use the `vegan_flag` function, it will sort things out. + * `vegan_*_spammer` function are for internal use. + */ +/* +function vegan_flag($stuff) { + // Build function name + $flag_func = "vegan_"; + + // Check who is reporting + $reporter = elgg_get_loggedin_user(); + + if (!$user) { + // Anonymous reporting + $vegan_func.= "watch"; + } else if ($user->spam_hunter || $user->admin) { + // Direct kill + $vegan_func = "ban"; + } else { + // Report by authenticated user + $vegan_func = "block"; + } + $vegan_func.= "_spammer"; + + // Check what is reported + if ($stuff instanceof ElggUser) { + // A user + } else if (is_numeric($stuff)) { + // A GUID + $stuff = get_entity($stuff); + } else if (preg_match($stuff, "/^https?:\/\/[^\/]+/(?:pg\/)profile\/([^\/\?\b]+)/", $stuff, $m)) { + $stuff = get_user_by_username($m[2]); + } + + if ($stuff instanceof ElggUser) { + $spammer_guid = $stuff->getGUID(); + } else if ($stuff instanceof ElggEntity) { + $spammer_guid = $stuff->getOwnerGUID(); + } else { + elgg_register_error(elgg_echo('vegan:error:invalid_reference')); + return FALSE; + } + + return $vegan_func($spammer_guid); +} + + +// Report a spammer anonymously +// will raise the vegan_watch count for that entity +function vegan_snitch_spammer($user) { + $user->vegan_watch = (int)$user->vegan_watch + 1; + // notify... + system_message(elgg_echo('vegan:action:success')); + return TRUE; +} + +// Block a spammer +// Reporter won't see it anymore +function vegan_block_spammer($user) { + $reporter_guid = get_loggedin_user_guid(); + // Watch it + $user->vegan_watch = (int)$user->vegan_watch + 1; + // Block it + elgg_create_entity_relationship($reporter_guid, $user->guid, "blocked"); + // Notify... + system_message(elgg_echo('vegan:action:success')); + return TRUE; +} + +// Ban a spammer +function vegan_ban_spammer($user) { + $reporter_guid = elgg_get_loggedin_user_guid(); + // Ban it + $user->ban("spammer"); + // Notify + system_message(elgg_echo('vegan:action:success')); + return TRUE; +} + +*/ + +/** + * vegan_spammer -- Determine whether a user is a spammer + * + * @param Integer $user_guid GUID of the user entity to test + * + * @return Boolean TRUE is user is a recognized spammer, FALSE otherwise. + */ +function vegan_is_spammer($user_guid) { + + $user = get_entity($user_guid); + + if (elgg_instanceof($user, 'user') && !$user->isBanned()) { + return (bool)$user->spammer; + } + + return FALSE; + +} diff --git a/views/default/plugins/vegan/settings.php b/views/default/plugins/vegan/settings.php new file mode 100644 index 000000000..22805e2a2 --- /dev/null +++ b/views/default/plugins/vegan/settings.php @@ -0,0 +1,16 @@ +<?php +/** + * Vegan -- Plugin settings view + * + */ + +$title = elgg_echo('vegan:settings:title'); + +$options = array( + 'name' => 'params[bad_domains]', + 'value' => $vars['entity']->bad_domains, +); + +$input = elgg_view('input/text', $options); + +echo "<p><label for=\"params[bad_domains]\">$title</label>$input</p>"; |