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wiaamm
2025-12-06 18:00:18 +02:00
parent 0a49169c9c
commit 489f49b7c7
1 changed files with 32 additions and 48 deletions
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80
attachments/kong/plugins/open-appsec-waf-kong-plugin/handler.lua
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@@ -15,7 +15,6 @@ function NanoHandler.init_worker()
nano.init_attachment()
end
-- **Handles Request Headers (DecodeHeaders Equivalent)**
function NanoHandler.access(conf)
local headers = kong.request.get_headers()
local session_id = nano.generate_session_id()
@@ -40,8 +39,8 @@ function NanoHandler.access(conf)
kong.log.err("Failed to handle start transaction - failing open")
nano.fini_session(session_data)
nano.cleanup_all()
--collectgarbage("restart")
--collectgarbage("collect")
collectgarbage("restart")
collectgarbage("collect")
kong.ctx.plugin.session_data = nil
kong.ctx.plugin.session_id = nil
return
@@ -52,8 +51,8 @@ function NanoHandler.access(conf)
kong.log.err("Failed to handle request headers - failing open")
nano.fini_session(session_data)
nano.cleanup_all()
--collectgarbage("restart")
--collectgarbage("collect")
collectgarbage("restart")
collectgarbage("collect")
kong.ctx.plugin.session_data = nil
kong.ctx.plugin.session_id = nil
return
@@ -68,7 +67,8 @@ function NanoHandler.access(conf)
local result = nano.handle_custom_response(session_data, response)
nano.fini_session(session_data)
nano.cleanup_all()
--collectgarbage("restart")
collectgarbage("restart")
collectgarbage("collect")
kong.ctx.plugin.session_data = nil
kong.ctx.plugin.session_id = nil
return result
@@ -83,24 +83,26 @@ function NanoHandler.access(conf)
local result = nano.handle_custom_response(session_data, response)
nano.fini_session(session_data)
nano.cleanup_all()
--collectgarbage("restart")
collectgarbage("restart")
collectgarbage("collect")
kong.ctx.plugin.session_data = nil
kong.ctx.plugin.session_id = nil
return result
end
else
kong.log.err("Request body not in memory, attempting to read from buffer/file")
kong.log.debug("Request body not in memory, attempting to read from buffer/file")
local body_data = ngx.var.request_body
if body_data and #body_data > 0 then
kong.log.err("Found request body in nginx var, size: ", #body_data)
kong.log.debug("Found request body in nginx var, size: ", #body_data)
verdict, response = nano.send_body(session_id, session_data, body_data, nano.HttpChunkType.HTTP_REQUEST_BODY)
if verdict == nano.AttachmentVerdict.DROP then
kong.ctx.plugin.blocked = true
local result = nano.handle_custom_response(session_data, response)
nano.fini_session(session_data)
nano.cleanup_all()
--collectgarbage("restart")
collectgarbage("restart")
collectgarbage("collect")
kong.ctx.plugin.session_data = nil
kong.ctx.plugin.session_id = nil
return result
@@ -108,7 +110,7 @@ function NanoHandler.access(conf)
else
local body_file = ngx.var.request_body_file
if body_file then
kong.log.err("Reading request body from file: ", body_file)
kong.log.debug("Reading request body from file: ", body_file)
local file = io.open(body_file, "rb")
if file then
local entire_body = file:read("*all")
@@ -117,7 +119,7 @@ function NanoHandler.access(conf)
if not entire_body then
kong.log.err("Failed to read body file: ", body_file)
elseif entire_body and #entire_body > 0 then
kong.log.err("Sending entire body of size ", #entire_body, " bytes to C module")
kong.log.debug("Sending entire body of size ", #entire_body, " bytes to C module")
verdict, response = nano.send_body(session_id, session_data, entire_body, nano.HttpChunkType.HTTP_REQUEST_BODY)
if verdict == nano.AttachmentVerdict.DROP then
kong.ctx.plugin.blocked = true
@@ -125,16 +127,17 @@ function NanoHandler.access(conf)
nano.fini_session(session_data)
nano.cleanup_all()
collectgarbage("restart")
collectgarbage("collect")
kong.ctx.plugin.session_data = nil
kong.ctx.plugin.session_id = nil
return result
end
else
kong.log.err("Empty body file")
kong.log.debug("Empty body file")
end
end
else
kong.log.err("Request body expected but no body data or file available")
kong.log.debug("Request body expected but no body data or file available")
end
end
end
@@ -148,7 +151,8 @@ function NanoHandler.access(conf)
kong.log.err("Error ending request inspection: ", pcall_verdict, " - failing open")
nano.fini_session(session_data)
nano.cleanup_all()
--collectgarbage("restart")
collectgarbage("restart")
collectgarbage("collect")
kong.ctx.plugin.session_data = nil
kong.ctx.plugin.session_id = nil
return
@@ -161,7 +165,8 @@ function NanoHandler.access(conf)
local result = nano.handle_custom_response(session_data, response)
nano.fini_session(session_data)
nano.cleanup_all()
--collectgarbage("restart")
collectgarbage("restart")
collectgarbage("collect")
kong.ctx.plugin.session_data = nil
kong.ctx.plugin.session_id = nil
return result
@@ -173,7 +178,8 @@ function NanoHandler.access(conf)
local result = nano.handle_custom_response(session_data, response)
nano.fini_session(session_data)
nano.cleanup_all()
--collectgarbage("restart")
collectgarbage("restart")
collectgarbage("collect")
kong.ctx.plugin.session_data = nil
kong.ctx.plugin.session_id = nil
return result
@@ -232,24 +238,17 @@ function NanoHandler.body_filter(conf)
local session_data = ctx.session_data
if not session_id or not session_data or ctx.session_finalized then
kong.log.err("No session data found or session already finalized in body_filter")
return
end
-- Initialize timeout tracking on first call
if not ctx.body_filter_start_time then
kong.log.err("Initializing body filter start time")
ctx.body_filter_start_time = ngx.now()
end
-- Check for timeout (150 seconds)
local elapsed_time = ngx.now() - ctx.body_filter_start_time
if elapsed_time > 150 then
kong.log.err("Body filter timeout after ", elapsed_time, " seconds - failing open")
-- End inspection before cleanup
kong.log.warn("Body filter timeout after ", elapsed_time, " seconds - failing open")
local verdict, response, modifications = nano.end_inspection(session_id, session_data, nano.HttpChunkType.HTTP_RESPONSE_END)
-- Handle modifications if any
if modifications then
local chunk = ngx.arg[1]
chunk = nano.handle_body_modifications(chunk, modifications, ctx.body_buffer_chunk or 0)
@@ -257,7 +256,6 @@ function NanoHandler.body_filter(conf)
end
if verdict == nano.AttachmentVerdict.DROP then
kong.log.err("Response body inspection verdict: DROP")
ctx.blocked = true
ctx.session_finalized = true
local result = nano.handle_custom_response(session_data, response)
@@ -271,29 +269,23 @@ function NanoHandler.body_filter(conf)
end
nano.fini_session(session_data)
nano.cleanup_all()
-- collectgarbage("restart")
-- collectgarbage("collect") -- Force immediate collection
collectgarbage("restart")
collectgarbage("collect")
ctx.session_finalized = true
ctx.session_data = nil
ctx.session_id = nil
return
end
-- Get current chunk only, not entire body
local chunk = ngx.arg[1]
local eof = ngx.arg[2]
if chunk and #chunk > 0 then
-- Initialize if not exists
ctx.body_buffer_chunk = ctx.body_buffer_chunk or 0
kong.log.err("Processing response body chunk #", ctx.body_buffer_chunk, " bytes, EOF: ", tostring(eof))
ctx.body_seen = true
-- Process chunk by chunk to avoid loading entire large body into memory
local verdict, response, modifications = nano.send_body(session_id, session_data, chunk, nano.HttpChunkType.HTTP_RESPONSE_BODY)
-- Handle body modifications if any
if modifications then
chunk = nano.handle_body_modifications(chunk, modifications, ctx.body_buffer_chunk)
ngx.arg[1] = chunk
@@ -306,10 +298,9 @@ function NanoHandler.body_filter(conf)
ctx.session_finalized = true
local result = nano.handle_custom_response(session_data, response)
nano.fini_session(session_data)
-- Clean up allocated memory
nano.cleanup_all()
--collectgarbage("restart")
--collectgarbage("collect") -- Force immediate collection
collectgarbage("restart")
collectgarbage("collect")
ctx.session_data = nil
ctx.session_id = nil
ngx.arg[1] = ""
@@ -317,27 +308,21 @@ function NanoHandler.body_filter(conf)
return result
end
-- Cleanup allocated memory after processing each chunk to prevent accumulation
nano.free_all_responses()
nano.free_all_nano_str()
end
-- Handle end of stream
if eof then
kong.log.err("End of response body stream reached, body_seen: ", tostring(ctx.body_seen), ", expect_body: ", tostring(ctx.expect_body))
-- Always finalize at EOF, whether we saw body chunks or expected no body
if ctx.body_seen or ctx.expect_body == false then
kong.log.err("Ending response body inspection")
local verdict, response = nano.end_inspection(session_id, session_data, nano.HttpChunkType.HTTP_RESPONSE_END)
if verdict == nano.AttachmentVerdict.DROP then
ctx.blocked = true
ctx.session_finalized = true
local result = nano.handle_custom_response(session_data, response)
nano.fini_session(session_data)
-- Clean up allocated memory
nano.cleanup_all()
-- collectgarbage("restart")
--collectgarbage("collect") -- Force immediate collection
collectgarbage("restart")
collectgarbage("collect")
ctx.session_data = nil
ctx.session_id = nil
ngx.arg[1] = ""
@@ -346,10 +331,9 @@ function NanoHandler.body_filter(conf)
end
nano.fini_session(session_data)
-- Clean up allocated memory
nano.cleanup_all()
--collectgarbage("restart")
--collectgarbage("collect") -- Force immediate collection
collectgarbage("restart")
collectgarbage("collect")
ctx.session_finalized = true
ctx.session_data = nil
ctx.session_id = nil