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   1  <?php
   2  /**
   3   * @package Akismet
   4   */
   5  /*
   6  Plugin Name: Akismet
   7  Plugin URI: http://akismet.com/
   8  Description: Used by millions, Akismet is quite possibly the best way in the world to <strong>protect your blog from comment and trackback spam</strong>. It keeps your site protected from spam even while you sleep. To get started: 1) Click the "Activate" link to the left of this description, 2) <a href="http://akismet.com/get/?return=true">Sign up for an Akismet API key</a>, and 3) Go to your <a href="plugins.php?page=akismet-key-config">Akismet configuration</a> page, and save your API key.
   9  Version: 2.5.3
  10  Author: Automattic
  11  Author URI: http://automattic.com/wordpress-plugins/
  12  License: GPLv2 or later
  13  */
  14  
  15  /*
  16  This program is free software; you can redistribute it and/or
  17  modify it under the terms of the GNU General Public License
  18  as published by the Free Software Foundation; either version 2
  19  of the License, or (at your option) any later version.
  20  
  21  This program is distributed in the hope that it will be useful,
  22  but WITHOUT ANY WARRANTY; without even the implied warranty of
  23  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  24  GNU General Public License for more details.
  25  
  26  You should have received a copy of the GNU General Public License
  27  along with this program; if not, write to the Free Software
  28  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
  29  */
  30  
  31  define('AKISMET_VERSION', '2.5.3');
  32  define('AKISMET_PLUGIN_URL', plugin_dir_url( __FILE__ ));
  33  
  34  /** If you hardcode a WP.com API key here, all key config screens will be hidden */
  35  if ( defined('WPCOM_API_KEY') )
  36      $wpcom_api_key = constant('WPCOM_API_KEY');
  37  else
  38      $wpcom_api_key = '';
  39  
  40  // Make sure we don't expose any info if called directly
  41  if ( !function_exists( 'add_action' ) ) {
  42      echo "Hi there!  I'm just a plugin, not much I can do when called directly.";
  43      exit;
  44  }
  45  
  46  if ( isset($wp_db_version) && $wp_db_version <= 9872 )
  47      include_once dirname( __FILE__ ) . '/legacy.php';
  48  
  49  include_once dirname( __FILE__ ) . '/widget.php';
  50  
  51  if ( is_admin() )
  52      require_once dirname( __FILE__ ) . '/admin.php';
  53  
  54  function akismet_init() {
  55      global $wpcom_api_key, $akismet_api_host, $akismet_api_port;
  56  
  57      if ( $wpcom_api_key )
  58          $akismet_api_host = $wpcom_api_key . '.rest.akismet.com';
  59      else
  60          $akismet_api_host = get_option('wordpress_api_key') . '.rest.akismet.com';
  61  
  62      $akismet_api_port = 80;
  63  }
  64  add_action('init', 'akismet_init');
  65  
  66  function akismet_get_key() {
  67      global $wpcom_api_key;
  68      if ( !empty($wpcom_api_key) )
  69          return $wpcom_api_key;
  70      return get_option('wordpress_api_key');
  71  }
  72  
  73  function akismet_verify_key( $key, $ip = null ) {
  74      global $akismet_api_host, $akismet_api_port, $wpcom_api_key;
  75      $blog = urlencode( get_option('home') );
  76      if ( $wpcom_api_key )
  77          $key = $wpcom_api_key;
  78      $response = akismet_http_post("key=$key&blog=$blog", 'rest.akismet.com', '/1.1/verify-key', $akismet_api_port, $ip);
  79      if ( !is_array($response) || !isset($response[1]) || $response[1] != 'valid' && $response[1] != 'invalid' )
  80          return 'failed';
  81      return $response[1];
  82  }
  83  
  84  // if we're in debug or test modes, use a reduced service level so as not to polute training or stats data
  85  function akismet_test_mode() {
  86      if ( defined('AKISMET_TEST_MODE') && AKISMET_TEST_MODE )
  87          return true;
  88      return false;
  89  }
  90  
  91  // return a comma-separated list of role names for the given user
  92  function akismet_get_user_roles($user_id ) {
  93      $roles = false;
  94      
  95      if ( !class_exists('WP_User') )
  96          return false;
  97      
  98      if ( $user_id > 0 ) {
  99          $comment_user = new WP_User($user_id);
 100          if ( isset($comment_user->roles) )
 101              $roles = join(',', $comment_user->roles);
 102      }
 103  
 104      if ( is_multisite() && is_super_admin( $user_id ) ) {
 105          if ( empty( $roles ) ) {
 106              $roles = 'super_admin';
 107          } else {
 108              $comment_user->roles[] = 'super_admin';
 109              $roles = join( ',', $comment_user->roles );
 110          }
 111      }
 112  
 113      return $roles;
 114  }
 115  
 116  // Returns array with headers in $response[0] and body in $response[1]
 117  function akismet_http_post($request, $host, $path, $port = 80, $ip=null) {
 118      global $wp_version;
 119  
 120      $akismet_ua = "WordPress/{$wp_version} | ";
 121      $akismet_ua .= 'Akismet/' . constant( 'AKISMET_VERSION' );
 122  
 123      $content_length = strlen( $request );
 124  
 125      $http_host = $host;
 126      // use a specific IP if provided
 127      // needed by akismet_check_server_connectivity()
 128      if ( $ip && long2ip( ip2long( $ip ) ) ) {
 129          $http_host = $ip;
 130      } else {
 131          $http_host = $host;
 132      }
 133      
 134      // use the WP HTTP class if it is available
 135      if ( function_exists( 'wp_remote_post' ) ) {
 136          $http_args = array(
 137              'body'            => $request,
 138              'headers'        => array(
 139                  'Content-Type'    => 'application/x-www-form-urlencoded; ' .
 140                                      'charset=' . get_option( 'blog_charset' ),
 141                  'Host'            => $host,
 142                  'User-Agent'    => $akismet_ua
 143              ),
 144              'httpversion'    => '1.0',
 145              'timeout'        => 15
 146          );
 147          $akismet_url = "http://{$http_host}{$path}";
 148          $response = wp_remote_post( $akismet_url, $http_args );
 149          if ( is_wp_error( $response ) )
 150              return '';
 151  
 152          return array( $response['headers'], $response['body'] );
 153      } else {
 154          $http_request  = "POST $path HTTP/1.0\r\n";
 155          $http_request .= "Host: $host\r\n";
 156          $http_request .= 'Content-Type: application/x-www-form-urlencoded; charset=' . get_option('blog_charset') . "\r\n";
 157          $http_request .= "Content-Length: {$content_length}\r\n";
 158          $http_request .= "User-Agent: {$akismet_ua}\r\n";
 159          $http_request .= "\r\n";
 160          $http_request .= $request;
 161          
 162          $response = '';
 163          if( false != ( $fs = @fsockopen( $http_host, $port, $errno, $errstr, 10 ) ) ) {
 164              fwrite( $fs, $http_request );
 165  
 166              while ( !feof( $fs ) )
 167                  $response .= fgets( $fs, 1160 ); // One TCP-IP packet
 168              fclose( $fs );
 169              $response = explode( "\r\n\r\n", $response, 2 );
 170          }
 171          return $response;
 172      }
 173  }
 174  
 175  // filter handler used to return a spam result to pre_comment_approved
 176  function akismet_result_spam( $approved ) {
 177      // bump the counter here instead of when the filter is added to reduce the possibility of overcounting
 178      if ( $incr = apply_filters('akismet_spam_count_incr', 1) )
 179          update_option( 'akismet_spam_count', get_option('akismet_spam_count') + $incr );
 180      // this is a one-shot deal
 181      remove_filter( 'pre_comment_approved', 'akismet_result_spam' );
 182      return 'spam';
 183  }
 184  
 185  function akismet_result_hold( $approved ) {
 186      // once only
 187      remove_filter( 'pre_comment_approved', 'akismet_result_hold' );
 188      return '0';
 189  }
 190  
 191  // how many approved comments does this author have?
 192  function akismet_get_user_comments_approved( $user_id, $comment_author_email, $comment_author, $comment_author_url ) {
 193      global $wpdb;
 194      
 195      if ( !empty($user_id) )
 196          return $wpdb->get_var( $wpdb->prepare( "SELECT COUNT(*) FROM $wpdb->comments WHERE user_id = %d AND comment_approved = 1", $user_id ) );
 197          
 198      if ( !empty($comment_author_email) )
 199          return $wpdb->get_var( $wpdb->prepare( "SELECT COUNT(*) FROM $wpdb->comments WHERE comment_author_email = %s AND comment_author = %s AND comment_author_url = %s AND comment_approved = 1", $comment_author_email, $comment_author, $comment_author_url ) );
 200          
 201      return 0;
 202  }
 203  
 204  function akismet_microtime() {
 205      $mtime = explode( ' ', microtime() );
 206      return $mtime[1] + $mtime[0];
 207  }
 208  
 209  // log an event for a given comment, storing it in comment_meta
 210  function akismet_update_comment_history( $comment_id, $message, $event=null ) {
 211      global $current_user;
 212  
 213      // failsafe for old WP versions
 214      if ( !function_exists('add_comment_meta') )
 215          return false;
 216      
 217      $user = '';
 218      if ( is_object($current_user) && isset($current_user->user_login) )
 219          $user = $current_user->user_login;
 220  
 221      $event = array(
 222          'time' => akismet_microtime(),
 223          'message' => $message,
 224          'event' => $event,
 225          'user' => $user,
 226      );
 227  
 228      // $unique = false so as to allow multiple values per comment
 229      $r = add_comment_meta( $comment_id, 'akismet_history', $event, false );
 230  }
 231  
 232  // get the full comment history for a given comment, as an array in reverse chronological order
 233  function akismet_get_comment_history( $comment_id ) {
 234      
 235      // failsafe for old WP versions
 236      if ( !function_exists('add_comment_meta') )
 237          return false;
 238  
 239      $history = get_comment_meta( $comment_id, 'akismet_history', false );
 240      usort( $history, 'akismet_cmp_time' );
 241      return $history;
 242  }
 243  
 244  function akismet_cmp_time( $a, $b ) {
 245      return $a['time'] > $b['time'] ? -1 : 1;
 246  }
 247  
 248  // this fires on wp_insert_comment.  we can't update comment_meta when akismet_auto_check_comment() runs
 249  // because we don't know the comment ID at that point.
 250  function akismet_auto_check_update_meta( $id, $comment ) {
 251      global $akismet_last_comment;
 252  
 253      // failsafe for old WP versions
 254      if ( !function_exists('add_comment_meta') )
 255          return false;
 256  
 257      // wp_insert_comment() might be called in other contexts, so make sure this is the same comment
 258      // as was checked by akismet_auto_check_comment
 259      if ( is_object($comment) && !empty($akismet_last_comment) && is_array($akismet_last_comment) ) {
 260          if ( intval($akismet_last_comment['comment_post_ID']) == intval($comment->comment_post_ID)
 261              && $akismet_last_comment['comment_author'] == $comment->comment_author
 262              && $akismet_last_comment['comment_author_email'] == $comment->comment_author_email ) {
 263                  // normal result: true or false
 264                  if ( $akismet_last_comment['akismet_result'] == 'true' ) {
 265                      update_comment_meta( $comment->comment_ID, 'akismet_result', 'true' );
 266                      akismet_update_comment_history( $comment->comment_ID, __('Akismet caught this comment as spam'), 'check-spam' );
 267                      if ( $comment->comment_approved != 'spam' )
 268                          akismet_update_comment_history( $comment->comment_ID, sprintf( __('Comment status was changed to %s'), $comment->comment_approved), 'status-changed'.$comment->comment_approved );
 269                  } elseif ( $akismet_last_comment['akismet_result'] == 'false' ) {
 270                      update_comment_meta( $comment->comment_ID, 'akismet_result', 'false' );
 271                      akismet_update_comment_history( $comment->comment_ID, __('Akismet cleared this comment'), 'check-ham' );
 272                      if ( $comment->comment_approved == 'spam' ) {
 273                          if ( wp_blacklist_check($comment->comment_author, $comment->comment_author_email, $comment->comment_author_url, $comment->comment_content, $comment->comment_author_IP, $comment->comment_agent) )
 274                              akismet_update_comment_history( $comment->comment_ID, __('Comment was caught by wp_blacklist_check'), 'wp-blacklisted' );
 275                          else
 276                              akismet_update_comment_history( $comment->comment_ID, sprintf( __('Comment status was changed to %s'), $comment->comment_approved), 'status-changed-'.$comment->comment_approved );
 277                      }
 278                  // abnormal result: error
 279                  } else {
 280                      update_comment_meta( $comment->comment_ID, 'akismet_error', time() );
 281                      akismet_update_comment_history( $comment->comment_ID, sprintf( __('Akismet was unable to check this comment (response: %s), will automatically retry again later.'), $akismet_last_comment['akismet_result']), 'check-error' );
 282                  }
 283                  
 284                  // record the complete original data as submitted for checking
 285                  if ( isset($akismet_last_comment['comment_as_submitted']) )
 286                      update_comment_meta( $comment->comment_ID, 'akismet_as_submitted', $akismet_last_comment['comment_as_submitted'] );
 287          }
 288      }
 289  }
 290  
 291  add_action( 'wp_insert_comment', 'akismet_auto_check_update_meta', 10, 2 );
 292  
 293  
 294  function akismet_auto_check_comment( $commentdata ) {
 295      global $akismet_api_host, $akismet_api_port, $akismet_last_comment;
 296  
 297      $comment = $commentdata;
 298      $comment['user_ip']    = $_SERVER['REMOTE_ADDR'];
 299      $comment['user_agent'] = $_SERVER['HTTP_USER_AGENT'];
 300      $comment['referrer']   = $_SERVER['HTTP_REFERER'];
 301      $comment['blog']       = get_option('home');
 302      $comment['blog_lang']  = get_locale();
 303      $comment['blog_charset'] = get_option('blog_charset');
 304      $comment['permalink']  = get_permalink($comment['comment_post_ID']);
 305      
 306      $comment['user_role'] = akismet_get_user_roles($comment['user_ID']);
 307  
 308      $akismet_nonce_option = apply_filters( 'akismet_comment_nonce', get_option( 'akismet_comment_nonce' ) );
 309      $comment['akismet_comment_nonce'] = 'inactive';
 310      if ( $akismet_nonce_option == 'true' || $akismet_nonce_option == '' ) {
 311          $comment['akismet_comment_nonce'] = 'failed';
 312          if ( isset( $_POST['akismet_comment_nonce'] ) && wp_verify_nonce( $_POST['akismet_comment_nonce'], 'akismet_comment_nonce_' . $comment['comment_post_ID'] ) )
 313              $comment['akismet_comment_nonce'] = 'passed';
 314  
 315          // comment reply in wp-admin
 316          if ( isset( $_POST['_ajax_nonce-replyto-comment'] ) && check_ajax_referer( 'replyto-comment', '_ajax_nonce-replyto-comment' ) )
 317              $comment['akismet_comment_nonce'] = 'passed';
 318  
 319      }
 320  
 321      if ( akismet_test_mode() )
 322          $comment['is_test'] = 'true';
 323          
 324      foreach ($_POST as $key => $value ) {
 325          if ( is_string($value) )
 326              $comment["POST_{$key}"] = $value;
 327      }
 328  
 329      $ignore = array( 'HTTP_COOKIE', 'HTTP_COOKIE2', 'PHP_AUTH_PW' );
 330  
 331      foreach ( $_SERVER as $key => $value ) {
 332          if ( !in_array( $key, $ignore ) && is_string($value) )
 333              $comment["$key"] = $value;
 334          else
 335              $comment["$key"] = '';
 336      }
 337  
 338      $query_string = '';
 339      foreach ( $comment as $key => $data )
 340          $query_string .= $key . '=' . urlencode( stripslashes($data) ) . '&';
 341          
 342      $commentdata['comment_as_submitted'] = $comment;
 343  
 344      $response = akismet_http_post($query_string, $akismet_api_host, '/1.1/comment-check', $akismet_api_port);
 345      $commentdata['akismet_result'] = $response[1];
 346      if ( 'true' == $response[1] ) {
 347          // akismet_spam_count will be incremented later by akismet_result_spam()
 348          add_filter('pre_comment_approved', 'akismet_result_spam');
 349  
 350          do_action( 'akismet_spam_caught' );
 351  
 352          $post = get_post( $comment['comment_post_ID'] );
 353          $last_updated = strtotime( $post->post_modified_gmt );
 354          $diff = time() - $last_updated;
 355          $diff = $diff / 86400;
 356          
 357          if ( $post->post_type == 'post' && $diff > 30 && get_option( 'akismet_discard_month' ) == 'true' && empty($comment['user_ID']) ) {
 358              // akismet_result_spam() won't be called so bump the counter here
 359              if ( $incr = apply_filters('akismet_spam_count_incr', 1) )
 360                  update_option( 'akismet_spam_count', get_option('akismet_spam_count') + $incr );
 361              wp_redirect( $_SERVER['HTTP_REFERER'] );
 362              die();
 363          }
 364      }
 365      
 366      // if the response is neither true nor false, hold the comment for moderation and schedule a recheck
 367      if ( 'true' != $response[1] && 'false' != $response[1] ) {
 368          add_filter('pre_comment_approved', 'akismet_result_hold');
 369          wp_schedule_single_event( time() + 1200, 'akismet_schedule_cron_recheck' );
 370      }
 371      
 372      if ( function_exists('wp_next_scheduled') && function_exists('wp_schedule_event') ) {
 373          // WP 2.1+: delete old comments daily
 374          if ( !wp_next_scheduled('akismet_scheduled_delete') )
 375              wp_schedule_event(time(), 'daily', 'akismet_scheduled_delete');
 376      } elseif ( (mt_rand(1, 10) == 3) ) {
 377          // WP 2.0: run this one time in ten
 378          akismet_delete_old();
 379      }
 380      $akismet_last_comment = $commentdata;
 381      return $commentdata;
 382  }
 383  
 384  add_action('preprocess_comment', 'akismet_auto_check_comment', 1);
 385  
 386  function akismet_delete_old() {
 387      global $wpdb;
 388      $now_gmt = current_time('mysql', 1);
 389      $comment_ids = $wpdb->get_col("SELECT comment_id FROM $wpdb->comments WHERE DATE_SUB('$now_gmt', INTERVAL 15 DAY) > comment_date_gmt AND comment_approved = 'spam'");
 390      if ( empty( $comment_ids ) )
 391          return;
 392          
 393      $comma_comment_ids = implode( ', ', array_map('intval', $comment_ids) );
 394  
 395      do_action( 'delete_comment', $comment_ids );
 396      $wpdb->query("DELETE FROM $wpdb->comments WHERE comment_id IN ( $comma_comment_ids )");
 397      $wpdb->query("DELETE FROM $wpdb->commentmeta WHERE comment_id IN ( $comma_comment_ids )");
 398      clean_comment_cache( $comment_ids );
 399      $n = mt_rand(1, 5000);
 400      if ( apply_filters('akismet_optimize_table', ($n == 11)) ) // lucky number
 401          $wpdb->query("OPTIMIZE TABLE $wpdb->comments");
 402  
 403  }
 404  
 405  add_action('akismet_scheduled_delete', 'akismet_delete_old');
 406  
 407  function akismet_check_db_comment( $id, $recheck_reason = 'recheck_queue' ) {
 408      global $wpdb, $akismet_api_host, $akismet_api_port;
 409  
 410      $id = (int) $id;
 411      $c = $wpdb->get_row( "SELECT * FROM $wpdb->comments WHERE comment_ID = '$id'", ARRAY_A );
 412      if ( !$c )
 413          return;
 414  
 415      $c['user_ip']    = $c['comment_author_IP'];
 416      $c['user_agent'] = $c['comment_agent'];
 417      $c['referrer']   = '';
 418      $c['blog']       = get_option('home');
 419      $c['blog_lang']  = get_locale();
 420      $c['blog_charset'] = get_option('blog_charset');
 421      $c['permalink']  = get_permalink($c['comment_post_ID']);
 422      $id = $c['comment_ID'];
 423      if ( akismet_test_mode() )
 424          $c['is_test'] = 'true';
 425      $c['recheck_reason'] = $recheck_reason;
 426  
 427      $query_string = '';
 428      foreach ( $c as $key => $data )
 429      $query_string .= $key . '=' . urlencode( stripslashes($data) ) . '&';
 430  
 431      $response = akismet_http_post($query_string, $akismet_api_host, '/1.1/comment-check', $akismet_api_port);
 432      return $response[1];
 433  }
 434  
 435  function akismet_cron_recheck() {
 436      global $wpdb;
 437  
 438      delete_option('akismet_available_servers');
 439  
 440      $comment_errors = $wpdb->get_col( "
 441          SELECT comment_id
 442          FROM {$wpdb->prefix}commentmeta
 443          WHERE meta_key = 'akismet_error'
 444          LIMIT 100
 445      " );
 446      
 447      foreach ( (array) $comment_errors as $comment_id ) {
 448          // if the comment no longer exists, remove the meta entry from the queue to avoid getting stuck
 449          if ( !get_comment( $comment_id ) ) {
 450              delete_comment_meta( $comment_id, 'akismet_error' );
 451              continue;
 452          }
 453          
 454          add_comment_meta( $comment_id, 'akismet_rechecking', true );
 455          $status = akismet_check_db_comment( $comment_id, 'retry' );
 456  
 457          $msg = '';
 458          if ( $status == 'true' ) {
 459              $msg = __( 'Akismet caught this comment as spam during an automatic retry.' );
 460          } elseif ( $status == 'false' ) {
 461              $msg = __( 'Akismet cleared this comment during an automatic retry.' );
 462          }
 463          
 464          // If we got back a legit response then update the comment history
 465          // other wise just bail now and try again later.  No point in
 466          // re-trying all the comments once we hit one failure.
 467          if ( !empty( $msg ) ) {
 468              delete_comment_meta( $comment_id, 'akismet_error' );
 469              akismet_update_comment_history( $comment_id, $msg, 'cron-retry' );
 470              update_comment_meta( $comment_id, 'akismet_result', $status );
 471              // make sure the comment status is still pending.  if it isn't, that means the user has already moved it elsewhere.
 472              $comment = get_comment( $comment_id );
 473              if ( $comment && 'unapproved' == wp_get_comment_status( $comment_id ) ) {
 474                  if ( $status == 'true' ) {
 475                      wp_spam_comment( $comment_id );
 476                  } elseif ( $status == 'false' ) {
 477                      // comment is good, but it's still in the pending queue.  depending on the moderation settings
 478                      // we may need to change it to approved.
 479                      if ( check_comment($comment->comment_author, $comment->comment_author_email, $comment->comment_author_url, $comment->comment_content, $comment->comment_author_IP, $comment->comment_agent, $comment->comment_type) )
 480                          wp_set_comment_status( $comment_id, 1 );
 481                  }
 482              }
 483          } else {
 484              delete_comment_meta( $comment_id, 'akismet_rechecking' );
 485              wp_schedule_single_event( time() + 1200, 'akismet_schedule_cron_recheck' );
 486              return;
 487          }
 488      }
 489      
 490      $remaining = $wpdb->get_var( $wpdb->prepare( "SELECT COUNT(*) FROM $wpdb->commentmeta WHERE meta_key = 'akismet_error'" ) );
 491      if ( $remaining && !wp_next_scheduled('akismet_schedule_cron_recheck') ) {
 492          wp_schedule_single_event( time() + 1200, 'akismet_schedule_cron_recheck' );
 493      }
 494  }
 495  add_action( 'akismet_schedule_cron_recheck', 'akismet_cron_recheck' );
 496  
 497  function akismet_add_comment_nonce( $post_id ) {
 498      echo '<p style="display: none;">';
 499      wp_nonce_field( 'akismet_comment_nonce_' . $post_id, 'akismet_comment_nonce', FALSE );
 500      echo '</p>';
 501  }
 502  
 503  $akismet_comment_nonce_option = apply_filters( 'akismet_comment_nonce', get_option( 'akismet_comment_nonce' ) );
 504  
 505  if ( $akismet_comment_nonce_option == 'true' || $akismet_comment_nonce_option == '' )
 506      add_action( 'comment_form', 'akismet_add_comment_nonce' );
 507  
 508  if ( '3.0.5' == $wp_version ) { 
 509      remove_filter( 'comment_text', 'wp_kses_data' ); 
 510      if ( is_admin() ) 
 511          add_filter( 'comment_text', 'wp_kses_post' ); 
 512  }