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https://github.com/openappsec/attachment.git
synced 2025-12-31 05:39:07 +03:00
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This commit is contained in:
wiaamm
@@ -15,42 +15,20 @@ function NanoHandler.init_worker()
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nano.init_attachment()
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end
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-- **Handles Request Headers (DecodeHeaders Equivalent)**
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function NanoHandler.access(conf)
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kong.log.debug("1-ACCESS PHASE START ========================================")
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if not kong.router.get_route() then
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kong.log.debug("ACCESS SKIPPED: no route matched")
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return
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end
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local request_path = kong.request.get_path()
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if request_path and (
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request_path:match("^/status") or
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request_path:match("^/_health") or
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request_path:match("^/metrics")
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) then
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kong.log.debug("ACCESS SKIPPED: internal endpoint: ", request_path)
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return
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end
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if ngx.var.internal then
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kong.log.debug("ACCESS SKIPPED: internal subrequest")
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return
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end
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local request_uri = ngx.var.request_uri
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if not request_uri or request_uri == "" then
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kong.log.debug("ACCESS SKIPPED: TLS handshake or no URI")
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return
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end
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local headers = kong.request.get_headers()
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local session_id = nano.generate_session_id()
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kong.service.request.set_header("x-session-id", tostring(session_id))
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if NanoHandler.processed_requests[session_id] then
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kong.ctx.plugin.blocked = true
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return
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end
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local session_data = nano.init_session(session_id)
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if not session_data then
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kong.log.err("Failed to initialize session - failing open (no session created)")
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kong.log.err("Failed to initialize session - failing open")
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return
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end
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@@ -59,11 +37,7 @@ function NanoHandler.access(conf)
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local meta_data = nano.handle_start_transaction()
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if not meta_data then
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kong.log.err("Failed to handle start transaction - cleaning up session and failing open")
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nano.fini_session(session_data)
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nano.cleanup_all()
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kong.ctx.plugin.session_id = nil
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kong.ctx.plugin.session_data = nil
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kong.log.err("Failed to handle start transaction - failing open")
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return
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end
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@@ -73,15 +47,11 @@ function NanoHandler.access(conf)
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local contains_body = has_content_length and 1 or 0
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local verdict, response = nano.send_data(session_id, session_data, meta_data, req_headers, contains_body, nano.HttpChunkType.HTTP_REQUEST_FILTER)
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if verdict == nano.AttachmentVerdict.DROP then
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kong.log.err("DROP verdict in access/send_data - session_id: ", session_id)
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nano.fini_session(session_data)
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kong.ctx.plugin.blocked = true
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local result = nano.handle_custom_response(session_data, response)
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nano.fini_session(session_data)
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nano.cleanup_all()
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kong.ctx.plugin.session_data = nil
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kong.ctx.plugin.session_id = nil
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return result
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end
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@@ -90,315 +60,172 @@ function NanoHandler.access(conf)
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if body and #body > 0 then
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verdict, response = nano.send_body(session_id, session_data, body, nano.HttpChunkType.HTTP_REQUEST_BODY)
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if verdict == nano.AttachmentVerdict.DROP then
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kong.log.err("DROP verdict in access/send_body (raw) - session_id: ", session_id)
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nano.fini_session(session_data)
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kong.ctx.plugin.blocked = true
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local result = nano.handle_custom_response(session_data, response)
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nano.fini_session(session_data)
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nano.cleanup_all()
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kong.ctx.plugin.session_data = nil
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kong.ctx.plugin.session_id = nil
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return result
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end
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-- Free body from memory after sending
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body = nil
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collectgarbage("step", 100)
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else
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kong.log.err("Request body not in memory, attempting to read from buffer/file")
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kong.log.debug("Request body not in memory, attempting to read from buffer/file")
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local body_data = ngx.var.request_body
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if body_data and #body_data > 0 then
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kong.log.err("Found request body in nginx var, size: ", #body_data)
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kong.log.debug("Found request body in nginx var, size: ", #body_data)
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verdict, response = nano.send_body(session_id, session_data, body_data, nano.HttpChunkType.HTTP_REQUEST_BODY)
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if verdict == nano.AttachmentVerdict.DROP then
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kong.log.err("DROP verdict in access/send_body (var) - session_id: ", session_id)
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kong.ctx.plugin.blocked = true
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local result = nano.handle_custom_response(session_data, response)
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nano.fini_session(session_data)
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nano.cleanup_all()
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kong.ctx.plugin.session_data = nil
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kong.ctx.plugin.session_id = nil
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return result
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kong.ctx.plugin.blocked = true
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return nano.handle_custom_response(session_data, response)
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end
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-- Free body_data from memory
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body_data = nil
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collectgarbage("step", 100)
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else
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local body_file = ngx.var.request_body_file
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if body_file then
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kong.log.err("Reading request body from file: ", body_file)
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kong.log.debug("Reading request body from file: ", body_file)
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local file = io.open(body_file, "rb")
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if file then
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local entire_body = file:read("*all")
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file:close()
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if entire_body and #entire_body > 0 then
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kong.log.err("Sending entire body of size ", #entire_body, " bytes to C module")
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kong.log.debug("Sending entire body of size ", #entire_body, " bytes to C module")
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verdict, response = nano.send_body(session_id, session_data, entire_body, nano.HttpChunkType.HTTP_REQUEST_BODY)
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if verdict == nano.AttachmentVerdict.DROP then
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kong.log.err("DROP verdict in access/send_body (file) - session_id: ", session_id)
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nano.fini_session(session_data)
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kong.ctx.plugin.blocked = true
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local result = nano.handle_custom_response(session_data, response)
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nano.fini_session(session_data)
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nano.cleanup_all()
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kong.ctx.plugin.session_data = nil
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kong.ctx.plugin.session_id = nil
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return result
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end
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-- Free entire_body from memory
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entire_body = nil
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collectgarbage("step", 100)
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else
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kong.log.err("Empty body file")
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kong.log.debug("Empty body file")
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end
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end
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else
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kong.log.err("Request body expected but no body data or file available")
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kong.log.warn("Request body expected but no body data or file available")
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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 request inspection
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local ok, verdict, response = pcall(function()
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return nano.end_inspection(session_id, session_data, nano.HttpChunkType.HTTP_REQUEST_END)
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end)
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local ok, verdict, response = pcall(function()
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return nano.end_inspection(session_id, session_data, nano.HttpChunkType.HTTP_REQUEST_END)
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end)
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if not ok then
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kong.log.err("Error ending request inspection: ", verdict, " - failing open")
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nano.fini_session(session_data)
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nano.cleanup_all()
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collectgarbage("collect")
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kong.ctx.plugin.session_id = nil
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kong.ctx.plugin.session_data = nil
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return
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end
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if not ok then
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kong.log.err("Error ending request inspection: ", verdict, " - failing open")
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nano.fini_session(session_data)
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nano.cleanup_all()
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return
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end
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if verdict == nano.AttachmentVerdict.DROP then
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kong.log.err("DROP verdict in access/end_inspection - session_id: ", session_id)
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kong.ctx.plugin.blocked = true
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local result = nano.handle_custom_response(session_data, response)
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nano.fini_session(session_data)
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nano.cleanup_all()
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kong.ctx.plugin.session_data = nil
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kong.ctx.plugin.session_id = nil
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return result
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if verdict == nano.AttachmentVerdict.DROP then
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nano.fini_session(session_data)
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kong.ctx.plugin.blocked = true
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local result = nano.handle_custom_response(session_data, response)
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nano.cleanup_all()
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return result
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end
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else
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verdict, response = nano.end_inspection(session_id, session_data, nano.HttpChunkType.HTTP_REQUEST_END)
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if verdict == nano.AttachmentVerdict.DROP then
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nano.fini_session(session_data)
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kong.ctx.plugin.blocked = true
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local result = nano.handle_custom_response(session_data, response)
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nano.cleanup_all()
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return result
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end
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end
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NanoHandler.processed_requests[session_id] = true
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end
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function NanoHandler.header_filter(conf)
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kong.log.debug("2-HEADER_FILTER PHASE START")
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local ctx = kong.ctx.plugin
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if ctx.blocked then
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return
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end
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if not ctx.session_id or not ctx.session_data then
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kong.log.debug("No session data in header_filter")
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local session_id = ctx.session_id
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local session_data = ctx.session_data
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if not session_id or not session_data then
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kong.log.err("No session data found in header_filter")
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return
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end
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local headers = kong.response.get_headers()
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local header_data = nano.handleHeaders(headers)
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local status_code = kong.response.get_status()
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local content_length = tonumber(headers["content-length"]) or 0
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local ok, verdict, response = pcall(function()
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return nano.send_response_headers(ctx.session_id, ctx.session_data, nano.handleHeaders(headers), status_code, content_length)
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end)
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if not ok then
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kong.log.err("send_response_headers failed: ", tostring(verdict))
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nano.fini_session(ctx.session_data)
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nano.cleanup_all()
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collectgarbage("collect")
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ctx.session_id = nil
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ctx.session_data = nil
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return
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end
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local verdict, response = nano.send_response_headers(session_id, session_data, header_data, status_code, content_length)
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if verdict == nano.AttachmentVerdict.DROP then
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kong.log.err("DROP verdict in header_filter - session_id: ", ctx.session_id)
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ctx.blocked = true
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local result = nano.handle_custom_response(ctx.session_data, response)
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nano.fini_session(ctx.session_data)
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kong.ctx.plugin.blocked = true
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nano.fini_session(session_data)
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nano.cleanup_all()
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ctx.session_data = nil
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ctx.session_id = nil
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return result
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elseif verdict == nano.AttachmentVerdict.ACCEPT then
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kong.log.debug("ACCEPT verdict in header_filter - marking inspection complete")
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return nano.handle_custom_response(session_data, response)
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end
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ctx.expect_body = not (status_code == 204 or status_code == 304 or (100 <= status_code and status_code < 200) or content_length == 0)
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end
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function NanoHandler.body_filter(conf)
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local ctx = kong.ctx.plugin
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local eof = ngx.arg[2]
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-- Log first chunk only
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if not ctx.body_filter_start_time then
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kong.log.debug("3-BODY_FILTER PHASE START")
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ctx.body_filter_start_time = ngx.now() * 1000
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end
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-- Fast path: skip if already blocked
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if ctx.blocked then
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ngx.arg[1] = nil -- Discard chunk if blocked
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collectgarbage("step", 100)
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return
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end
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if not ctx.session_id or not ctx.session_data then
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ngx.arg[1] = nil
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collectgarbage("step", 100)
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local session_id = ctx.session_id
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local session_data = ctx.session_data
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||||
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if not session_id or not session_data or ctx.session_finalized then
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return
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end
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||||
-- CRITICAL: Check if session is finalized (exactly like Envoy does)
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-- This prevents sending chunks after final verdict received
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||||
if nano.is_session_finalized(ctx.session_data) then
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kong.log.debug("Session already finalized - skipping inspection")
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||||
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local body = kong.response.get_raw_body()
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||||
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||||
if body then
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ctx.body_seen = true
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local verdict, response, modifications = nano.send_body(session_id, session_data, body, nano.HttpChunkType.HTTP_RESPONSE_BODY)
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||||
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-- Initialize if not exists
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||||
ctx.body_buffer_chunk = ctx.body_buffer_chunk or 0
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-- Handle body modifications if any
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if modifications then
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body = nano.handle_body_modifications(body, modifications, ctx.body_buffer_chunk)
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||||
kong.response.set_raw_body(body)
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end
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ctx.body_buffer_chunk = ctx.body_buffer_chunk + 1
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||||
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if verdict == nano.AttachmentVerdict.DROP then
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nano.fini_session(session_data)
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ctx.session_finalized = true
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||||
local result = nano.handle_custom_response(session_data, response)
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||||
-- Clean up allocated memory
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||||
nano.cleanup_all()
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||||
return result
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||||
end
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||||
return
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||||
end
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||||
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||||
-- Check timeout (150 seconds)
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||||
local elapsed = (ngx.now() * 1000) - ctx.body_filter_start_time
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||||
if elapsed > 150000 then
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||||
kong.log.err("Timeout after ", elapsed, "ms - cleaning up session")
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||||
ngx.arg[1] = nil -- Discard chunk first
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||||
nano.fini_session(ctx.session_data)
|
||||
|
||||
if ctx.body_seen or ctx.expect_body == false then
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||||
local verdict, response = nano.end_inspection(session_id, session_data, nano.HttpChunkType.HTTP_RESPONSE_END)
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||||
if verdict == nano.AttachmentVerdict.DROP then
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||||
nano.fini_session(session_data)
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||||
ctx.session_finalized = true
|
||||
local result = nano.handle_custom_response(session_data, response)
|
||||
-- Clean up allocated memory
|
||||
nano.cleanup_all()
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||||
return result
|
||||
end
|
||||
|
||||
nano.fini_session(session_data)
|
||||
-- Clean up allocated memory
|
||||
nano.cleanup_all()
|
||||
collectgarbage("collect")
|
||||
ctx.session_id = nil
|
||||
ctx.session_data = nil
|
||||
return
|
||||
end
|
||||
|
||||
-- Read chunk for active inspection
|
||||
local chunk = ngx.arg[1]
|
||||
|
||||
if chunk and #chunk > 0 then
|
||||
local ok, result = pcall(function()
|
||||
return {nano.send_body(ctx.session_id, ctx.session_data, chunk, nano.HttpChunkType.HTTP_RESPONSE_BODY)}
|
||||
end)
|
||||
|
||||
if ok then
|
||||
local verdict = result[1]
|
||||
local response = result[2]
|
||||
local modifications = result[3]
|
||||
|
||||
if modifications then
|
||||
chunk = nano.handle_body_modifications(chunk, modifications, 0)
|
||||
ngx.arg[1] = chunk
|
||||
end
|
||||
|
||||
if verdict == nano.AttachmentVerdict.DROP then
|
||||
kong.log.err("DROP verdict in body_filter/send_body - session_id: ", ctx.session_id)
|
||||
ctx.blocked = true
|
||||
local result = nano.handle_custom_response(ctx.session_data, response)
|
||||
nano.fini_session(ctx.session_data)
|
||||
nano.cleanup_all()
|
||||
ctx.session_data = nil
|
||||
ctx.session_id = nil
|
||||
return result
|
||||
elseif verdict == nano.AttachmentVerdict.ACCEPT then
|
||||
-- Final ACCEPT verdict received - mark complete but don't cleanup yet (wait for EOF)
|
||||
kong.log.debug("ACCEPT verdict received - session finalized")
|
||||
end
|
||||
|
||||
-- Incremental GC after processing chunk
|
||||
chunk = nil
|
||||
collectgarbage("step", 100)
|
||||
else
|
||||
kong.log.err("nano.send_body failed: ", tostring(result), " - cleaning up session")
|
||||
nano.fini_session(ctx.session_data)
|
||||
nano.cleanup_all()
|
||||
collectgarbage("collect")
|
||||
ctx.session_id = nil
|
||||
ctx.session_data = nil
|
||||
return
|
||||
end
|
||||
end
|
||||
|
||||
-- Process EOF
|
||||
if eof then
|
||||
-- Only send end_inspection if we haven't already finalized
|
||||
if not nano.is_session_finalized(ctx.session_data) then
|
||||
local ok, result = pcall(function()
|
||||
return {nano.end_inspection(ctx.session_id, ctx.session_data, nano.HttpChunkType.HTTP_RESPONSE_END)}
|
||||
end)
|
||||
|
||||
if ok then
|
||||
local verdict = result[1]
|
||||
local response = result[2]
|
||||
|
||||
if verdict == nano.AttachmentVerdict.DROP then
|
||||
kong.log.err("DROP verdict in body_filter/end_inspection - session_id: ", ctx.session_id)
|
||||
ctx.blocked = true
|
||||
local result = nano.handle_custom_response(ctx.session_data, response)
|
||||
nano.fini_session(ctx.session_data)
|
||||
nano.cleanup_all()
|
||||
ctx.session_data = nil
|
||||
ctx.session_id = nil
|
||||
return result
|
||||
end
|
||||
else
|
||||
kong.log.err("nano.end_inspection failed: ", tostring(result), " - cleaning up session")
|
||||
end
|
||||
end
|
||||
|
||||
-- CRITICAL: Always cleanup session at EOF, even if inspection_complete is true
|
||||
-- This ensures ACCEPT verdict sessions get cleaned up
|
||||
if ctx.session_data then
|
||||
nano.fini_session(ctx.session_data)
|
||||
nano.cleanup_all()
|
||||
collectgarbage("collect")
|
||||
ctx.session_id = nil
|
||||
ctx.session_data = nil
|
||||
end
|
||||
ctx.session_finalized = true
|
||||
end
|
||||
end
|
||||
|
||||
function NanoHandler.log(conf)
|
||||
kong.log.debug("4-LOG PHASE START")
|
||||
local ctx = kong.ctx.plugin
|
||||
|
||||
-- Cleanup blocked sessions that returned early from access phase
|
||||
if ctx.blocked and ctx.session_data then
|
||||
kong.log.err("Cleaning up blocked session ", ctx.session_id)
|
||||
nano.fini_session(ctx.session_data)
|
||||
nano.cleanup_all()
|
||||
ctx.session_data = nil
|
||||
ctx.session_id = nil
|
||||
end
|
||||
|
||||
-- Force GC if memory is high
|
||||
local mem_before = collectgarbage("count")
|
||||
if mem_before > 10240 then
|
||||
kong.log.err("High memory: ", string.format("%.2f", mem_before), " KB - forcing GC")
|
||||
collectgarbage("collect")
|
||||
local mem_after = collectgarbage("count")
|
||||
kong.log.err("Memory after GC: ", string.format("%.2f", mem_after), " KB (freed ", string.format("%.2f", mem_before - mem_after), " KB)")
|
||||
end
|
||||
|
||||
-- Log memory periodically
|
||||
if ngx.worker.id() == 0 then
|
||||
local request_count = ngx.shared.kong_cache and ngx.shared.kong_cache:incr("request_count", 1, 0) or 0
|
||||
if request_count % 100 == 0 then
|
||||
local mem_kb = collectgarbage("count")
|
||||
kong.log.err("Lua memory: ", string.format("%.2f", mem_kb), " KB")
|
||||
end
|
||||
end
|
||||
|
||||
-- Emergency cleanup if body_filter never completed
|
||||
if ctx.session_id and ctx.session_data then
|
||||
kong.log.err("Emergency cleanup for session ", ctx.session_id)
|
||||
nano.fini_session(ctx.session_data)
|
||||
collectgarbage("collect")
|
||||
ctx.session_id = nil
|
||||
ctx.session_data = nil
|
||||
end
|
||||
end
|
||||
|
||||
return NanoHandler
|
||||
return NanoHandler
|
||||
@@ -6,8 +6,6 @@ local nano = {}
|
||||
nano.session_counter = 0
|
||||
nano.attachments = {}
|
||||
nano.num_workers = ngx.worker.count() or 1
|
||||
nano.last_init_attempt = {} -- Track timestamp of last init attempt per worker
|
||||
nano.init_backoff_seconds = 5 -- Wait 5 seconds between retry attempts
|
||||
nano.allocated_strings = {}
|
||||
nano.allocate_headers = {}
|
||||
nano.allocated_metadata = {}
|
||||
@@ -94,7 +92,6 @@ function nano.handle_custom_response(session_data, response)
|
||||
end
|
||||
|
||||
local response_type = nano_attachment.get_web_response_type(attachment, session_data, response)
|
||||
kong.log.err("Block response - type: ", response_type)
|
||||
|
||||
if response_type == nano.WebResponseType.RESPONSE_CODE_ONLY then
|
||||
local code = nano_attachment.get_response_code(response)
|
||||
@@ -102,13 +99,12 @@ function nano.handle_custom_response(session_data, response)
|
||||
kong.log.warn("Invalid response code received: ", code, " - using 403 instead")
|
||||
code = 403
|
||||
end
|
||||
kong.log.err("Response code only: ", code)
|
||||
kong.log.debug("Response code only: ", code)
|
||||
return kong.response.exit(code, "")
|
||||
end
|
||||
|
||||
if response_type == nano.WebResponseType.REDIRECT_WEB_RESPONSE then
|
||||
local location = nano_attachment.get_redirect_page(attachment, session_data, response)
|
||||
kong.log.err("Redirect response to: ", location)
|
||||
return kong.response.exit(307, "", { ["Location"] = location })
|
||||
end
|
||||
|
||||
@@ -122,8 +118,9 @@ function nano.handle_custom_response(session_data, response)
|
||||
kong.log.warn("Invalid response code received: ", code, " - using 403 instead")
|
||||
code = 403
|
||||
end
|
||||
kong.log.err("Block page response with code: ", code, ", page length: ", #block_page)
|
||||
kong.log.debug("Block page response with code: ", code)
|
||||
return kong.response.exit(code, block_page, { ["Content-Type"] = "text/html" })
|
||||
|
||||
end
|
||||
|
||||
|
||||
@@ -172,13 +169,6 @@ function nano.free_all_responses()
|
||||
nano.allocated_responses = {}
|
||||
end
|
||||
|
||||
-- Free a single response immediately (for INSPECT/ACCEPT verdicts)
|
||||
function nano.free_response_immediate(response)
|
||||
if response then
|
||||
nano_attachment.free_verdict_response(response)
|
||||
end
|
||||
end
|
||||
|
||||
function nano.cleanup_all()
|
||||
nano.free_all_nano_str()
|
||||
nano.free_all_metadata()
|
||||
@@ -188,20 +178,6 @@ end
|
||||
|
||||
function nano.init_attachment()
|
||||
local worker_id = ngx.worker.id()
|
||||
|
||||
-- Check if we should throttle retry attempts
|
||||
local last_attempt = nano.last_init_attempt[worker_id]
|
||||
if last_attempt then
|
||||
local time_since_last = ngx.now() - last_attempt
|
||||
if time_since_last < nano.init_backoff_seconds then
|
||||
-- Too soon to retry, skip this attempt
|
||||
return false
|
||||
end
|
||||
end
|
||||
|
||||
-- Record this attempt timestamp
|
||||
nano.last_init_attempt[worker_id] = ngx.now()
|
||||
|
||||
local attachment, err
|
||||
local retries = 3
|
||||
|
||||
@@ -215,11 +191,9 @@ function nano.init_attachment()
|
||||
end
|
||||
|
||||
if not attachment then
|
||||
kong.log.err("Worker ", worker_id, " failed to initialize attachment after ", retries, " attempts. Worker will operate in fail-open mode. Will retry in ", nano.init_backoff_seconds, " seconds.")
|
||||
return false
|
||||
kong.log.err("Worker ", worker_id, " failed to initialize attachment after ", retries, " attempts. Worker will operate in fail-open mode.")
|
||||
else
|
||||
nano.attachments[worker_id] = attachment
|
||||
nano.last_init_attempt[worker_id] = nil -- Clear backoff on success
|
||||
kong.log.info("Worker ", worker_id, " successfully initialized nano_attachment.")
|
||||
return true
|
||||
end
|
||||
@@ -231,18 +205,9 @@ function nano.init_session(session_id)
|
||||
|
||||
if not attachment then
|
||||
kong.log.warn("Attachment not found for worker ", worker_id, ", attempting to reinitialize...")
|
||||
local init_success = nano.init_attachment()
|
||||
|
||||
if not init_success then
|
||||
-- Log only if this is a fresh retry (not throttled)
|
||||
local last_attempt = nano.last_init_attempt[worker_id]
|
||||
if last_attempt and (ngx.now() - last_attempt) < 1 then
|
||||
kong.log.warn("Cannot initialize session: Attachment initialization just attempted for worker ", worker_id, " - failing open. Will retry in ", nano.init_backoff_seconds, " seconds.")
|
||||
end
|
||||
return nil
|
||||
end
|
||||
|
||||
nano.init_attachment()
|
||||
attachment = nano.attachments[worker_id]
|
||||
|
||||
if not attachment then
|
||||
kong.log.warn("Cannot initialize session: Attachment still not available for worker ", worker_id, " - failing open")
|
||||
return nil
|
||||
@@ -447,33 +412,6 @@ function nano.send_response_headers(session_id, session_data, headers, status_co
|
||||
return verdict, response
|
||||
end
|
||||
|
||||
function nano.send_content_length(session_id, session_data, content_length)
|
||||
local worker_id = ngx.worker.id()
|
||||
local attachment = nano.attachments[worker_id]
|
||||
|
||||
if not attachment then
|
||||
kong.log.warn("Attachment not available for worker ", worker_id, " - failing open")
|
||||
return nano.AttachmentVerdict.INSPECT
|
||||
end
|
||||
|
||||
local verdict, response = nano_attachment.send_content_length(
|
||||
attachment,
|
||||
session_id,
|
||||
session_data,
|
||||
content_length
|
||||
)
|
||||
|
||||
if response then
|
||||
if verdict == nano.AttachmentVerdict.DROP then
|
||||
table.insert(nano.allocated_responses, response)
|
||||
else
|
||||
nano.free_response_immediate(response)
|
||||
end
|
||||
end
|
||||
|
||||
return verdict, response
|
||||
end
|
||||
|
||||
function nano.handle_header_modifications(headers, modifications)
|
||||
if not modifications then
|
||||
return headers
|
||||
@@ -543,4 +481,4 @@ function nano.end_inspection(session_id, session_data, chunk_type)
|
||||
return verdict, response
|
||||
end
|
||||
|
||||
return nano
|
||||
return nano
|
||||
Reference in New Issue
Block a user