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- -- 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"
- local rspamd_logger = require "rspamd_logger"
-
- -- 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_length()
-
-
- if hc and len >= min and len < max then
- local images = hc:get_images()
- if images then
- for _,i in ipairs(images) do
- local tag = i['tag']
- if tag then
- local parent = tag:get_parent()
- if parent then
- if parent:get_type() == 'a' then
- -- do not trigger on small and unknown size images
- if i['height'] + i['width'] >= 210 or not i['embedded'] then
- return true
- end
- end
- end
- end
- end
- end
- end
- end
- end
- end
-
- rspamd_config.HTML_SHORT_LINK_IMG_1 = {
- callback = function(task)
- return check_html_image(task, 0, 1024)
- end,
- score = 3.0,
- group = 'html',
- description = 'Short html part (0..1K) with a link to an image'
- }
-
- rspamd_config.HTML_SHORT_LINK_IMG_2 = {
- callback = function(task)
- return check_html_image(task, 1024, 1536)
- end,
- score = 1.0,
- group = 'html',
- description = 'Short html part (1K..1.5K) with a link to an image'
- }
-
- rspamd_config.HTML_SHORT_LINK_IMG_3 = {
- callback = function(task)
- return check_html_image(task, 1536, 2048)
- end,
- score = 0.5,
- group = 'html',
- description = 'Short html part (1.5K..2K) with a link to an image'
- }
- rspamd_config.R_EMPTY_IMAGE = {
- callback = function(task)
- local tp = task:get_text_parts() -- get text parts in a message
-
- for _,p in ipairs(tp) do -- iterate over text parts array using `ipairs`
- if p:is_html() then -- if the current part is html part
- local hc = p:get_html() -- we get HTML context
- local len = p:get_length() -- and part's length
-
- if hc and len < 50 then -- if we have a part that has less than 50 bytes of text
- local images = hc:get_images() -- then we check for HTML images
-
- if images then -- if there are images
- for _,i in ipairs(images) do -- then iterate over images in the part
- if i['height'] + i['width'] >= 400 then -- if we have a large image
- local tag = i['tag']
- if tag then
- local parent = tag:get_parent()
- if parent then
- if parent:get_type() ~= 'a' then
- return true
- end
- end
- end
- end
- end
- end
- end
- end
- end
- end,
-
- score = 2.0,
- group = 'html',
- description = 'Message contains empty parts and image'
- }
-
- rspamd_config.R_SUSPICIOUS_IMAGES = {
- callback = function(task)
- local tp = task:get_text_parts() -- get text parts in a message
-
- for _, p in ipairs(tp) do
- local h = p:get_html()
-
- if h then
- local l = p:get_words_count()
- local img = h:get_images()
- local pic_words = 0
-
- if img then
- for _, i in ipairs(img) do
- local dim = i['width'] + i['height']
- local tag = i['tag']
-
- if tag then
- local parent = tag:get_parent()
- if parent then
- if parent:get_type() == 'a' then
- -- do not trigger on small and large images
- if dim > 100 and dim < 3000 then
- -- We assume that a single picture 100x200 contains approx 3 words of text
- pic_words = pic_words + dim / 100
- end
- end
- end
- end
- end
- end
-
- if l + pic_words > 0 then
- local rel = pic_words / (l + pic_words)
-
- if rel > 0.5 then
- return true, (rel - 0.5) * 2
- end
- end
- end
- end
-
- return false
- end,
-
- score = 5.0,
- group = 'html',
- description = 'Message contains many suspicious messages'
- }
-
- rspamd_config.R_WHITE_ON_WHITE = {
- callback = function(task)
- local tp = task:get_text_parts() -- get text parts in a message
- local ret = false
- local diff = 0.0
- local normal_len = 0
- local transp_len = 0
- local arg
-
- for _,p in ipairs(tp) do -- iterate over text parts array using `ipairs`
- if p:is_html() and p:get_html() then -- if the current part is html part
- normal_len = p:get_length()
- local hc = p:get_html() -- we get HTML context
-
- hc:foreach_tag('font', function(tag, len)
- local bl = tag:get_extra()
- if bl then
- if bl['bgcolor'] and bl['color'] then
- local color = bl['color']
- local bgcolor = bl['bgcolor']
- -- Should use visual approach here some day
- local diff_r = math.abs(color[1] - bgcolor[1]) / 255.0
- local diff_g = math.abs(color[2] - bgcolor[2]) / 255.0
- local diff_b = math.abs(color[3] - bgcolor[3]) / 255.0
- diff = (diff_r + diff_g + diff_b) / 3.0
-
- if diff < 0.1 then
- ret = true
- transp_len = (transp_len + tag:get_content_length()) *
- (0.1 - diff) * 5.0
- normal_len = normal_len - tag:get_content_length()
- if not arg then
- arg = string.format('%s color #%x%x%x bgcolor #%x%x%x',
- tostring(tag:get_type()),
- color[1], color[2], color[3],
- bgcolor[1], bgcolor[2], bgcolor[3])
- end
- else
-
- end
- end
- end
-
- return false -- Continue search
- end)
-
- end
- end
-
- if ret then
- if normal_len < 0 then normal_len = 0 end
- local transp_rate = transp_len / (normal_len + transp_len)
-
- if transp_rate > 0.1 then
- return true,(transp_rate * 2.0),arg
- end
- end
-
- return false
- end,
-
- score = 6.0,
- group = 'html',
- description = 'Message contains low contrast text'
- }
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