mirror of
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116 lines
3.2 KiB
Lua
116 lines
3.2 KiB
Lua
--[[
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Copyright (c) 2022, Vsevolod Stakhov <vsevolod@rspamd.com>
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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]]--
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local function process_pdf_specific(task, part, specific)
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local suspicious_factor = 0
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if specific.encrypted then
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task:insert_result('PDF_ENCRYPTED', 1.0, part:get_filename() or 'unknown')
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suspicious_factor = suspicious_factor + 0.1
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if specific.openaction then
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suspicious_factor = suspicious_factor + 0.5
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end
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end
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if specific.scripts then
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task:insert_result('PDF_JAVASCRIPT', 1.0, part:get_filename() or 'unknown')
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suspicious_factor = suspicious_factor + 0.1
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end
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if specific.suspicious then
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suspicious_factor = suspicious_factor + specific.suspicious
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end
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if suspicious_factor > 0.5 then
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if suspicious_factor > 1.0 then suspicious_factor = 1.0 end
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task:insert_result('PDF_SUSPICIOUS', suspicious_factor, part:get_filename() or 'unknown')
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end
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if specific.long_trailer then
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task:insert_result('PDF_LONG_TRAILER', 1.0, string.format('%s:%d',
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part:get_filename() or 'unknown', specific.long_trailer))
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end
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if specific.many_objects then
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task:insert_result('PDF_MANY_OBJECTS', 1.0, string.format('%s:%d',
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part:get_filename() or 'unknown', specific.many_objects))
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end
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if specific.timeout_processing then
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task:insert_result('PDF_TIMEOUT', 1.0, string.format('%s:%.3f',
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part:get_filename() or 'unknown', specific.timeout_processing))
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end
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end
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local tags_processors = {
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pdf = process_pdf_specific
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}
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local function process_specific_cb(task)
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local parts = task:get_parts() or {}
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for _,p in ipairs(parts) do
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if p:is_specific() then
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local data = p:get_specific()
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if data and type(data) == 'table' and data.tag then
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if tags_processors[data.tag] then
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tags_processors[data.tag](task, p, data)
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end
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end
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end
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end
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end
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local id = rspamd_config:register_symbol{
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type = 'callback',
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name = 'SPECIFIC_CONTENT_CHECK',
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callback = process_specific_cb
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}
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rspamd_config:register_symbol{
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type = 'virtual',
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name = 'PDF_ENCRYPTED',
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parent = id,
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groups = {"content", "pdf"},
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}
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rspamd_config:register_symbol{
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type = 'virtual',
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name = 'PDF_JAVASCRIPT',
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parent = id,
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groups = {"content", "pdf"},
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}
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rspamd_config:register_symbol{
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type = 'virtual',
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name = 'PDF_SUSPICIOUS',
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parent = id,
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groups = {"content", "pdf"},
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}
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rspamd_config:register_symbol{
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type = 'virtual',
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name = 'PDF_LONG_TRAILER',
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parent = id,
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groups = {"content", "pdf"},
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}
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rspamd_config:register_symbol{
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type = 'virtual',
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name = 'PDF_MANY_OBJECTS',
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parent = id,
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groups = {"content", "pdf"},
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}
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rspamd_config:register_symbol{
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type = 'virtual',
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name = 'PDF_TIMEOUT',
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parent = id,
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groups = {"content", "pdf"},
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} |