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fix response body

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wiaamm
2025-11-17 20:59:38 +02:00
parent 1a4765a3c6
commit 847b35f673
1 changed files with 32 additions and 4 deletions
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36
attachments/kong/plugins/open-appsec-waf-kong-plugin/handler.lua
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@@ -140,6 +140,7 @@ end
function NanoHandler.header_filter(conf)
local ctx = kong.ctx.plugin
if ctx.blocked then
kong.log.debug("[header_filter] Blocked context, returning early")
return
end
@@ -147,7 +148,7 @@ function NanoHandler.header_filter(conf)
local session_data = ctx.session_data
if not session_id or not session_data then
kong.log.err("No session data found in header_filter")
kong.log.err("[header_filter] No session data found in header_filter")
return
end
@@ -156,8 +157,11 @@ function NanoHandler.header_filter(conf)
local status_code = kong.response.get_status()
local content_length = tonumber(headers["content-length"]) or 0
kong.log.debug("[header_filter] Session: ", session_id, " | Status: ", status_code, " | Content-Length: ", content_length)
local verdict, response = nano.send_response_headers(session_id, session_data, header_data, status_code, content_length)
if verdict == nano.AttachmentVerdict.DROP then
kong.log.warn("[header_filter] Response headers verdict DROP for session: ", session_id)
kong.ctx.plugin.blocked = true
nano.fini_session(session_data)
nano.cleanup_all()
@@ -165,18 +169,26 @@ function NanoHandler.header_filter(conf)
end
ctx.expect_body = not (status_code == 204 or status_code == 304 or (100 <= status_code and status_code < 200) or content_length == 0)
kong.log.debug("[header_filter] Session: ", session_id, " | Expect body: ", ctx.expect_body)
end
function NanoHandler.body_filter(conf)
local ctx = kong.ctx.plugin
if ctx.blocked then
kong.log.debug("[body_filter] Blocked context, returning early")
return
end
local session_id = ctx.session_id
local session_data = ctx.session_data
if not session_id or not session_data or ctx.session_finalized then
if not session_id or not session_data then
kong.log.debug("[body_filter] No session_id or session_data, returning early")
return
end
if ctx.session_finalized then
kong.log.debug("[body_filter] Session already finalized for session: ", session_id, ", returning early")
return
end
@@ -184,16 +196,21 @@ function NanoHandler.body_filter(conf)
local chunk = ngx.arg[1]
local eof = ngx.arg[2]
kong.log.debug("[body_filter] Session: ", session_id, " | Chunk size: ", chunk and #chunk or 0, " | EOF: ", tostring(eof), " | body_seen: ", tostring(ctx.body_seen), " | expect_body: ", tostring(ctx.expect_body))
-- Process body chunk if present
if chunk and #chunk > 0 then
ctx.body_seen = true
kong.log.debug("Processing response body chunk, size: ", #chunk, " bytes, EOF: ", eof)
kong.log.debug("[body_filter] Processing response body chunk for session: ", session_id, ", size: ", #chunk, " bytes, EOF: ", tostring(eof))
local verdict, response, modifications = nano.send_body(session_id, session_data, chunk, nano.HttpChunkType.HTTP_RESPONSE_BODY)
ctx.body_buffer_chunk = ctx.body_buffer_chunk or 0
kong.log.debug("[body_filter] Session: ", session_id, " | Verdict after send_body: ", verdict, " | Chunk #: ", ctx.body_buffer_chunk)
if modifications then
kong.log.debug("[body_filter] Session: ", session_id, " | Applying body modifications")
chunk = nano.handle_body_modifications(chunk, modifications, ctx.body_buffer_chunk)
ngx.arg[1] = chunk
end
@@ -201,21 +218,29 @@ function NanoHandler.body_filter(conf)
ctx.body_buffer_chunk = ctx.body_buffer_chunk + 1
if verdict == nano.AttachmentVerdict.DROP then
kong.log.warn("[body_filter] Body chunk verdict DROP for session: ", session_id)
nano.fini_session(session_data)
ctx.session_finalized = true
local result = nano.handle_custom_response(session_data, response)
nano.cleanup_all()
return result
end
else
kong.log.debug("[body_filter] Session: ", session_id, " | Empty or no chunk, EOF: ", tostring(eof))
end
-- Handle end of response
if eof then
kong.log.debug("Response body end of stream reached")
kong.log.debug("[body_filter] Session: ", session_id, " | EOF reached, body_seen: ", tostring(ctx.body_seen), " | expect_body: ", tostring(ctx.expect_body))
if ctx.body_seen or ctx.expect_body == false then
kong.log.debug("[body_filter] Session: ", session_id, " | Ending inspection")
local verdict, response = nano.end_inspection(session_id, session_data, nano.HttpChunkType.HTTP_RESPONSE_END)
kong.log.debug("[body_filter] Session: ", session_id, " | End inspection verdict: ", verdict)
if verdict == nano.AttachmentVerdict.DROP then
kong.log.warn("[body_filter] End inspection verdict DROP for session: ", session_id)
nano.fini_session(session_data)
ctx.session_finalized = true
local result = nano.handle_custom_response(session_data, response)
@@ -223,9 +248,12 @@ function NanoHandler.body_filter(conf)
return result
end
kong.log.debug("[body_filter] Session: ", session_id, " | Finalizing session normally")
nano.fini_session(session_data)
nano.cleanup_all()
ctx.session_finalized = true
else
kong.log.debug("[body_filter] Session: ", session_id, " | EOF but not finalizing (body_seen: ", tostring(ctx.body_seen), ", expect_body: ", tostring(ctx.expect_body), ")")
end
end
end