mirror of
https://github.com/openappsec/attachment.git
synced 2025-12-31 05:39:07 +03:00
393 lines
15 KiB
Lua
Executable File
393 lines
15 KiB
Lua
Executable File
local module_name = ...
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local prefix = module_name:match("^(.-)handler$")
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local nano = require(prefix .. "nano_ffi")
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local kong = kong
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local NanoHandler = {}
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NanoHandler.PRIORITY = 3000
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NanoHandler.VERSION = "1.0.0"
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function NanoHandler.init_worker()
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nano.init_attachment()
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end
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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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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.ctx.plugin.inspection_complete = true
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return
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end
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kong.ctx.plugin.session_data = session_data
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kong.ctx.plugin.session_id = session_id
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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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kong.ctx.plugin.inspection_complete = true
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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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return
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end
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local req_headers = nano.handleHeaders(headers)
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local has_content_length = tonumber(ngx.var.http_content_length) and tonumber(ngx.var.http_content_length) > 0
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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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-- Restart GC after send_data completes (was stopped in handle_start_transaction)
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collectgarbage("restart")
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if verdict == nano.AttachmentVerdict.DROP then
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kong.ctx.plugin.blocked = true
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kong.ctx.plugin.inspection_complete = 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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kong.ctx.plugin.session_id = nil
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kong.ctx.plugin.session_data = nil
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return result
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end
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if contains_body == 1 then
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local body = kong.request.get_raw_body()
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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.ctx.plugin.blocked = true
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kong.ctx.plugin.inspection_complete = 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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kong.ctx.plugin.session_id = nil
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kong.ctx.plugin.session_data = 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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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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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.ctx.plugin.blocked = true
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kong.ctx.plugin.inspection_complete = 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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kong.ctx.plugin.session_id = nil
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kong.ctx.plugin.session_data = nil
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return result
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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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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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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.ctx.plugin.blocked = true
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kong.ctx.plugin.inspection_complete = 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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kong.ctx.plugin.session_id = nil
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kong.ctx.plugin.session_data = 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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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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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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if not ok then
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kong.log.err("Error ending request inspection: ", verdict, " - failing open")
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kong.ctx.plugin.inspection_complete = true
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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 verdict == nano.AttachmentVerdict.DROP then
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kong.ctx.plugin.blocked = true
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kong.ctx.plugin.inspection_complete = 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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kong.ctx.plugin.session_id = nil
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kong.ctx.plugin.session_data = nil
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return result
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end
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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 or ctx.inspection_complete 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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return
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end
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local headers = kong.response.get_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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ctx.inspection_complete = true
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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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if verdict == nano.AttachmentVerdict.DROP then
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ctx.blocked = true
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ctx.inspection_complete = 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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ctx.session_id = nil
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ctx.session_data = nil
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return result
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end
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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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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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return
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end
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-- Check if session is already finalized (like Envoy/nginx do)
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if nano.is_session_finalized(ctx.session_data) then
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kong.log.debug("Skipping already inspected session")
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return -- Let remaining data pass through
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end
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-- Initialize timeout tracking on first chunk
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if not ctx.body_filter_start_time then
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ctx.body_filter_start_time = ngx.now() * 1000
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end
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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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ctx.inspection_complete = true
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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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-- Read chunk for active inspection
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local chunk = ngx.arg[1]
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if chunk and #chunk > 0 then
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local ok, result = pcall(function()
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return {nano.send_body(ctx.session_id, ctx.session_data, chunk, nano.HttpChunkType.HTTP_RESPONSE_BODY)}
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end)
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if ok then
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local verdict = result[1]
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local response = result[2]
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local modifications = result[3]
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if modifications then
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chunk = nano.handle_body_modifications(chunk, modifications, 0)
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ngx.arg[1] = chunk
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end
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if verdict == nano.AttachmentVerdict.DROP then
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ctx.blocked = true
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ctx.inspection_complete = 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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collectgarbage("collect")
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ctx.session_id = nil
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ctx.session_data = nil
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return result
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elseif verdict == nano.AttachmentVerdict.ACCEPT then
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-- Final ACCEPT verdict received - session is now finalized at C level
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kong.log.debug("ACCEPT verdict received - session finalized")
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ctx.inspection_complete = true
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end
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else
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kong.log.err("nano.send_body failed: ", tostring(result), " - cleaning up session")
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ctx.inspection_complete = true
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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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end
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-- Process EOF
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if eof then
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-- Only send end_inspection if session not already finalized
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if not nano.is_session_finalized(ctx.session_data) then
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local ok, result = pcall(function()
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return {nano.end_inspection(ctx.session_id, ctx.session_data, nano.HttpChunkType.HTTP_RESPONSE_END)}
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end)
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if ok then
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local verdict = result[1]
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local response = result[2]
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if verdict == nano.AttachmentVerdict.DROP then
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ctx.blocked = true
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ctx.inspection_complete = 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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collectgarbage("collect")
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ctx.session_id = nil
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ctx.session_data = nil
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return result
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end
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else
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kong.log.err("nano.end_inspection failed: ", tostring(result), " - cleaning up session")
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end
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end
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-- Clean up session at EOF
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if not ctx.inspection_complete then
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ctx.inspection_complete = true
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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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end
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end
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end
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function NanoHandler.log(conf)
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kong.log.debug("4-LOG PHASE START")
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local ctx = kong.ctx.plugin
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-- Force GC if memory is high
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local mem_before = collectgarbage("count")
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if mem_before > 10240 then
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kong.log.err("High memory: ", string.format("%.2f", mem_before), " KB - forcing GC")
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collectgarbage("collect")
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local mem_after = collectgarbage("count")
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kong.log.err("Memory after GC: ", string.format("%.2f", mem_after), " KB (freed ", string.format("%.2f", mem_before - mem_after), " KB)")
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end
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-- Log memory periodically
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if ngx.worker.id() == 0 then
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local request_count = ngx.shared.kong_cache and ngx.shared.kong_cache:incr("request_count", 1, 0) or 0
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if request_count % 100 == 0 then
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local mem_kb = collectgarbage("count")
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kong.log.err("Lua memory: ", string.format("%.2f", mem_kb), " KB")
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end
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end
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-- Emergency cleanup if body_filter never completed
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if ctx.session_id and ctx.session_data and not ctx.inspection_complete then
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kong.log.err("Emergency cleanup for session ", ctx.session_id)
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nano.fini_session(ctx.session_data)
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collectgarbage("collect")
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ctx.inspection_complete = true
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ctx.session_id = nil
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ctx.session_data = nil
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end
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end
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return NanoHandler
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