mirror of
https://github.com/openappsec/attachment.git
synced 2025-12-31 05:39:07 +03:00
445 lines
18 KiB
Lua
Executable File
445 lines
18 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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NanoHandler.sessions = {}
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NanoHandler.processed_requests = {}
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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.err("1-111111111 ACCESS PHASE START -------------------------------------------------------------------------------------------------------------------------------------------------")
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local route = kong.router.get_route()
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if not route then
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kong.log.err("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.err("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.err("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.err("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.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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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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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 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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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 result
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end
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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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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 result
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end
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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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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 result
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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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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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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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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 result
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end
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end
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else
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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 (no body): ", 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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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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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 result
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end
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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.err("2-222222222 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 ctx.inspection_complete then
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kong.log.err("Inspection already completed, skipping header_filter")
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return
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end
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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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kong.log.err("2-BEFORE send_response_headers call - session_id=", session_id, " status=", status_code, " content_length=", content_length)
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local ok, verdict, response = pcall(function()
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return nano.send_response_headers(session_id, session_data, header_data, status_code, content_length)
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end)
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if not ok then
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kong.log.err("2-ERROR in send_response_headers: ", tostring(verdict), " - failing open, skipping response inspection")
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ctx.inspection_complete = true
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nano.fini_session(session_data)
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nano.cleanup_all()
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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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kong.log.err("2-Response headers verdict: ", verdict, " (INSPECT=", nano.AttachmentVerdict.INSPECT, ", ACCEPT=", nano.AttachmentVerdict.ACCEPT, ", DROP=", nano.AttachmentVerdict.DROP, ")")
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if verdict == nano.AttachmentVerdict.DROP then
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kong.ctx.plugin.blocked = true
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ctx.inspection_complete = true
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local custom_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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ctx.session_id = nil
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ctx.session_data = nil
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return custom_result
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end
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kong.log.err("2-Response headers verdict: ", verdict, " - continuing to body_filter (will inspect body chunks)")
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end
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function NanoHandler.body_filter(conf)
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local chunk = ngx.arg[1]
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local eof = ngx.arg[2]
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local chunk_size = chunk and #chunk or 0
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kong.log.err("3-333333333 BODY_FILTER - chunk_size=" .. chunk_size .. " eof=" .. tostring(eof) .. " -------------------------------------------------------------------------------------------------------------------------------------------------")
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local ctx = kong.ctx.plugin
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if ctx.blocked then
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kong.log.err("3-BLOCKED: returning early")
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-- If EOF and session still exists, cleanup to prevent memory leak
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if eof and ctx.session_data and not ctx.session_cleaned then
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kong.log.err("3-BLOCKED + EOF: cleaning up session to prevent memory leak")
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nano.fini_session(ctx.session_data)
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nano.cleanup_all()
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ctx.session_id = nil
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ctx.session_data = nil
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ctx.session_cleaned = true
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end
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return
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end
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if ctx.inspection_complete then
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kong.log.err("3-INSPECTION_COMPLETE: chunk_size=" .. chunk_size .. " eof=" .. tostring(eof) .. " - PASSING THROUGH")
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goto skip_inspection
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end
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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 body_filter - letting chunk pass through")
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goto skip_inspection
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end
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if not ctx.body_buffer_chunk then
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ctx.body_buffer_chunk = 0
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ctx.body_filter_start_time = ngx.now() * 1000
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end
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local current_time = ngx.now() * 1000
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local elapsed = current_time - ctx.body_filter_start_time
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if elapsed > 150000 then
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kong.log.err("Body filter timeout exceeded (", elapsed, "ms) - finalizing session")
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kong.log.err("------------------------------------------------------------------------")
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kong.log.err("SETTING inspection_complete=true in body_filter (TIMEOUT)")
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kong.log.err("------------------------------------------------------------------------")
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ctx.inspection_complete = true
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ctx.session_cleaned = true
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nano.fini_session(session_data)
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nano.cleanup_all()
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ctx.session_id = nil
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ctx.session_data = nil
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goto skip_inspection
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end
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if chunk and #chunk > 0 then
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ctx.body_seen = true
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-- Only send to nano if inspection not yet complete
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if not ctx.inspection_complete then
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local ok, result = pcall(function()
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return {nano.send_body(session_id, 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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kong.log.err("CHUNK #", ctx.body_buffer_chunk, " VERDICT: ", verdict, " (INSPECT=", nano.AttachmentVerdict.INSPECT, ", ACCEPT=", nano.AttachmentVerdict.ACCEPT, ", DROP=", nano.AttachmentVerdict.DROP, ")")
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if modifications then
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chunk = nano.handle_body_modifications(chunk, modifications, ctx.body_buffer_chunk)
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ngx.arg[1] = chunk
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end
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ctx.body_buffer_chunk = ctx.body_buffer_chunk + 1
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if verdict == nano.AttachmentVerdict.DROP then
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ctx.plugin.blocked = true
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ctx.inspection_complete = true
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ctx.session_cleaned = true
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local custom_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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ctx.session_id = nil
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ctx.session_data = nil
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return custom_result
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end
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else
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kong.log.err("nano.send_body failed, failing open: ", tostring(result))
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end
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else
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-- Inspection already complete - just count the chunk and pass through
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kong.log.err("CHUNK #", ctx.body_buffer_chunk, " - skipping nano.send_body (inspection complete)")
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ctx.body_buffer_chunk = ctx.body_buffer_chunk + 1
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end
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end
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-- Only process EOF if inspection is not yet complete (session still active)
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if not ctx.inspection_complete and (eof or (ctx.expect_body == false and not ctx.body_seen)) then
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local ok, result = pcall(function()
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return {nano.end_inspection(session_id, 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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kong.log.err("3-Response END verdict: " .. tostring(verdict))
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if verdict == nano.AttachmentVerdict.DROP then
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ctx.plugin.blocked = true
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ctx.inspection_complete = true
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ctx.session_cleaned = true
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local custom_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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ctx.session_id = nil
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ctx.session_data = nil
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return custom_result
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else
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-- Normal case: ACCEPT or INSPECT verdict
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kong.log.err("------------------------------------------------------------------------")
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kong.log.err("SETTING inspection_complete=true in body_filter (EOF processing complete)")
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kong.log.err("------------------------------------------------------------------------")
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ctx.inspection_complete = true
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ctx.session_cleaned = true
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kong.log.err("EOF reached - finalizing session in body_filter")
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nano.fini_session(session_data)
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nano.cleanup_all()
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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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else
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kong.log.err("nano.end_inspection failed, failing open: ", tostring(result))
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ctx.inspection_complete = true
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end
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end
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::skip_inspection::
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end
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function NanoHandler.log(conf)
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kong.log.err("4-44444444444444444444-------------------------------------------------------------------------------------------------------------------------------------------------")
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local ctx = kong.ctx.plugin
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if ctx.session_id and ctx.session_data then
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-- If inspection already complete, it was cleaned up in body_filter - skip
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if ctx.inspection_complete then
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kong.log.err("Log phase: inspection already complete, session already finalized in body_filter")
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return
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end
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-- If we reach here, body_filter never completed (connection closed/timeout/etc)
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-- We MUST clean up here to prevent memory leak
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kong.log.err("Log phase: body_filter never completed - finalizing session now to prevent memory leak")
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local session_data = ctx.session_data
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local session_id = ctx.session_id
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kong.log.err("Log phase: finalizing session ", session_id)
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nano.fini_session(session_data)
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nano.cleanup_all()
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ctx.session_id = nil
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ctx.session_data = nil
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ctx.inspection_complete = true
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kong.log.err("Session ", session_id, " finalized in log phase due to incomplete body_filter processing")
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else
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kong.log.err("Log phase: no session data to finalize")
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end
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end
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return NanoHandler
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