Start work on new HTML rules.

conf/lua/html.lua

@@ -0,0 +1,53 @@
+-- Licensed to the Apache Software Foundation (ASF) under one or more
+-- contributor license agreements.  See the NOTICE file distributed with
+-- this work for additional information regarding copyright ownership.
+-- The ASF licenses this file to you under the Apache License, Version 2.0
+-- (the "License"); you may not use this file except in compliance with
+-- the License.  You may obtain a copy of the License at:
+-- 
+--     http://www.apache.org/licenses/LICENSE-2.0
+-- 
+-- Unless required by applicable law or agreed to in writing, software
+-- distributed under the License is distributed on an "AS IS" BASIS,
+-- WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+-- See the License for the specific language governing permissions and
+-- limitations under the License.
+
+local reconf = config['regexp']
+local rspamd_regexp = require "rspamd_regexp"
+
+-- Messages that have only HTML part
+reconf['MIME_HTML_ONLY'] = 'has_only_html_part()'
+
+local function check_html_image(task, min, max)
+  local tp = task:get_text_parts()
+  
+  for _,p in ipairs(tp) do
+    if p:is_html() then
+      local hc = p:get_html()
+      local len = p:get_raw_length()
+      
+      if len >= min and len < max then
+        local images = hc:get_images()
+        
+        if images then
+          for _,i in ipairs(images) do
+            if i['embedded'] then
+              return true
+            end
+          end
+        end
+      end
+    end
+  end
+end
+
+rspamd_config.HTML_SHORT_LINK_IMG_1 = function(task)
+  return check_html_image(task, 0, 1024)
+end
+rspamd_config.HTML_SHORT_LINK_IMG_2 = function(task)
+  return check_html_image(task, 1024, 1536)
+end
+rspamd_config.HTML_SHORT_LINK_IMG_3 = function(task)
+  return check_html_image(task, 1536, 2048)
+end

conf/lua/regexp/headers.lua

@@ -70,10 +70,6 @@ reconf['R_MISSING_CHARSET']= string.format('content_type_is_type(text) & !conten
 -- Subject seems to be spam
 reconf['R_SAJDING'] = 'Subject=/\\bsajding(?:om|a)?\\b/iH'
 
-reconf['MIME_HTML_ONLY'] = 'has_only_html_part()'
-
-
 -- Find forged Outlook MUA 
 -- Yahoo groups messages
 local yahoo_bulk = 'Received=/from \\[\\S+\\] by \\S+\\.(?:groups|scd|dcn)\\.yahoo\\.com with NNFMP/H'

conf/lua/rspamd.lua

@@ -32,16 +32,13 @@ dofile('regexp/headers.lua')
 dofile('regexp/lotto.lua')
 dofile('regexp/fraud.lua')
 dofile('regexp/drugs.lua')
+dofile('html.lua')
 
 local reconf = config['regexp']
 local util = require "rspamd_util"
 
 -- Uncategorized rules
 
-local html_length_1024_1536 = 'has_content_part_len(\'text\', \'html\', 1024, 1536)'
-local html_link_image = '/<img /iPr'
-reconf['HTML_SHORT_LINK_IMG_2'] = string.format('(%s) & (%s)', html_length_1024_1536, html_link_image)
-
 -- Local rules
 local r_bgcolor = '/BGCOLOR=/iP'
 local r_font_color = '/font color=[\\"\']?\\#FFFFFF[\\"\']?/iP'

conf/metrics.conf

@@ -430,8 +430,18 @@ metric {
 	symbol {
 	    weight = 3.0;
 	    description = "Short html part with a link to an image";
+	    name = "HTML_SHORT_LINK_IMG_1";
+	}
+	symbol {
+	    weight = 1.0;
+	    description = "Short html part with a link to an image";
 	    name = "HTML_SHORT_LINK_IMG_2";
 	}
+	symbol {
+	    weight = 0.5;
+	    description = "Short html part with a link to an image";
+	    name = "HTML_SHORT_LINK_IMG_3";
+	}
 	symbol {
 	    weight = 5.0;
 	    description = "Suspicious boundary in header Content-Type";