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return to basic version

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wiaamm
2025-11-30 01:17:39 +02:00
parent 1dbbe338e1
commit dee2d3a5db
1 changed files with 16 additions and 78 deletions
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86
attachments/kong/plugins/open-appsec-waf-kong-plugin/handler.lua
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@@ -182,93 +182,36 @@ function NanoHandler.body_filter(conf)
return
end
-- Initialize chunk counter and timeout tracking on first call
local chunk = ngx.arg[1]
local eof = ngx.arg[2]
-- Initialize on first call
if not ctx.body_buffer_chunk then
ctx.body_buffer_chunk = 0
ctx.body_filter_start_time = ngx.now() * 1000
ctx.num_body_filter_calls = 0
ctx.last_chunk_hash = nil
end
ctx.num_body_filter_calls = ctx.num_body_filter_calls + 1
-- Check timeout (2.5 minutes)
local current_time = ngx.now() * 1000
if current_time - ctx.body_filter_start_time > 150000 then
kong.log.warn("body_filter timeout exceeded (2.5 minutes), failing open")
if not ctx.session_finalized then
nano.fini_session(session_data)
nano.cleanup_all()
ctx.session_finalized = true
end
return
end
local chunk = ngx.arg[1]
local eof = ngx.arg[2]
local full_body = kong.response.get_raw_body()
local is_streaming = (full_body == nil and chunk ~= nil)
-- Return early for empty/nil chunks that aren't EOF
if not eof and (not chunk or (type(chunk) == "string" and #chunk == 0)) and not full_body then
kong.log.debug("Skipping empty chunk, call #", ctx.num_body_filter_calls)
return
end
local chunk_size = chunk and type(chunk) == "string" and #chunk or 0
kong.log.debug("body_filter call #", ctx.num_body_filter_calls, ", chunk size: ", chunk_size, ", eof: ", eof, ", sent: ", ctx.body_buffer_chunk, " chunks")
if full_body and not ctx.body_seen then
if chunk and #chunk > 0 then
ctx.body_seen = true
local ok, result = pcall(function()
return {nano.send_body(session_id, session_data, full_body, nano.HttpChunkType.HTTP_RESPONSE_BODY)}
end)
if ok and result and result[1] then
local verdict = result[1]
local response = result[2]
local modifications = result[3]
if modifications then
full_body = nano.handle_body_modifications(full_body, modifications, ctx.body_buffer_chunk)
kong.response.set_raw_body(full_body)
end
ctx.body_buffer_chunk = ctx.body_buffer_chunk + 1
if verdict == nano.AttachmentVerdict.DROP then
nano.fini_session(session_data)
ctx.session_finalized = true
local custom_result = nano.handle_custom_response(session_data, response)
nano.cleanup_all()
return custom_result
end
else
kong.log.warn("nano.send_body failed for in-memory body: ", result)
ctx.body_buffer_chunk = ctx.body_buffer_chunk + 1
ctx.failed_nano_send = true
end
elseif is_streaming and chunk and type(chunk) == "string" and #chunk > 0 then
ctx.body_seen = true
local chunk_hash = ngx.crc32_long(chunk)
if chunk_hash == ctx.last_chunk_hash then
kong.log.debug("Duplicate chunk detected (same hash as previous), skipping")
return
end
-- Wrap in pcall for fail-open behavior
local ok, result = pcall(function()
return {nano.send_body(session_id, session_data, chunk, nano.HttpChunkType.HTTP_RESPONSE_BODY)}
end)
if ok and result and result[1] then
ctx.last_chunk_hash = chunk_hash
ctx.body_buffer_chunk = ctx.body_buffer_chunk + 1
local verdict = result[1]
local response = result[2]
local modifications = result[3]
@@ -278,6 +221,8 @@ function NanoHandler.body_filter(conf)
ngx.arg[1] = chunk
end
ctx.body_buffer_chunk = ctx.body_buffer_chunk + 1
if verdict == nano.AttachmentVerdict.DROP then
nano.fini_session(session_data)
ctx.session_finalized = true
@@ -286,18 +231,15 @@ function NanoHandler.body_filter(conf)
return custom_result
end
else
-- Nano send failed - finalize session immediately and fail open
kong.log.warn("nano.send_body failed, finalizing session and failing open: ", result)
-- Nano failed - finalize session and pass through
kong.log.warn("nano.send_body failed, failing open: ", tostring(result))
if not ctx.session_finalized then
nano.fini_session(session_data)
nano.cleanup_all()
ctx.session_finalized = true
end
-- Pass chunk through uninspected
return
end
return
end
if eof or (ctx.expect_body == false and not ctx.body_seen) then
@@ -313,14 +255,10 @@ function NanoHandler.body_filter(conf)
if verdict == nano.AttachmentVerdict.DROP then
nano.fini_session(session_data)
ctx.session_finalized = true
ngx.arg[1] = nil
ngx.arg[2] = true
local custom_result = nano.handle_custom_response(session_data, response)
nano.cleanup_all()
return custom_result
end
else
kong.log.warn("nano.end_inspection failed: ", result)
end
nano.fini_session(session_data)