Logging of Tarpit requests cause a stack dump #84
Description
Example caddy file
{
auto_https off
admin off
skip_install_trust
log {
level DEBUG
}
}
:8080 {
log
route {
defender tarpit {
ranges 0.0.0.0/0
tarpit_config {
content http://example.com
# Optional. Complete request at this duration if content EOF is not reached. Default 30s
#headers {
# content-length "0"
#}
timeout 60s
# Optional. Rate of data stream. Default 24
bytes_per_second 2000
}
}
}
}
Run docker container:
docker run -it --rm -p 8080:8080 -v $(pwd)/Caddyfile:/etc/caddy/Caddyfile ghcr.io/jasonlovesdoggo/caddy-defender:latest caddy run --config /etc/caddy/Caddyfile --adapter caddyfile
Causes stack dump:
2025/05/22 17:04:48.748 DEBUG http.stdlib http: panic serving 192.168.65.1:62029: interface conversion: *caddyhttp.responseRecorder is not http.Flusher: missing method Flush
goroutine 70 [running]:
net/http.(*conn).serve.func1()
net/http/server.go:1947 +0xbe
panic({0x1888440?, 0xc0004ad8c0?})
runtime/panic.go:792 +0x132
pkg.jsn.cam/caddy-defender/responders/tarpit.(*Responder).ServeHTTP(0xc000a23d28, {0x7fffb8897548, 0xc0007c7900}, 0xc000c272c0, {0x1?, 0x1?})
pkg.jsn.cam/[email protected]/responders/tarpit/tarpit.go:113 +0x546
pkg.jsn.cam/caddy-defender.Defender.ServeHTTP({{0x2036c60, 0xc000a23d28}, 0xc0007905e0, 0xc0006d6700, {0x0, 0x0}, {0x0, 0x0}, {0xc0004b480a, 0x6}, ...}, ...)
pkg.jsn.cam/[email protected]/middleware.go:69 +0x709
github.com/caddyserver/caddy/v2/modules/caddyhttp.wrapMiddleware.func1.1({0x7fffb8897548, 0xc0007c7900}, 0xc000c272c0)
github.com/caddyserver/caddy/[email protected]/modules/caddyhttp/routes.go:331 +0xd2
github.com/caddyserver/caddy/v2/modules/caddyhttp.HandlerFunc.ServeHTTP(0x203a200?, {0x7fffb8897548?, 0xc0007c7900?}, 0xc000c272c0?)
github.com/caddyserver/caddy/[email protected]/modules/caddyhttp/caddyhttp.go:74 +0x29
github.com/caddyserver/caddy/v2/modules/caddyhttp.RouteList.Compile.wrapRoute.func1.1({0x7fffb8897548, 0xc0007c7900}, 0xc000c272c0)
github.com/caddyserver/caddy/[email protected]/modules/caddyhttp/routes.go:298 +0x24e
github.com/caddyserver/caddy/v2/modules/caddyhttp.HandlerFunc.ServeHTTP(0xc0006cc360?, {0x7fffb8897548?, 0xc0007c7900?}, 0x203a200?)
github.com/caddyserver/caddy/[email protected]/modules/caddyhttp/caddyhttp.go:74 +0x29
github.com/caddyserver/caddy/v2/modules/caddyhttp.(*Subroute).ServeHTTP(0xc000790540, {0x7fffb8897548, 0xc0007c7900}, 0xc000c272c0, {0x203a200, 0x1e2c288})
github.com/caddyserver/caddy/[email protected]/modules/caddyhttp/subroute.go:74 +0x62
github.com/caddyserver/caddy/v2/modules/caddyhttp.wrapMiddleware.func1.1({0x7fffb8897548, 0xc0007c7900}, 0xc000c272c0)
github.com/caddyserver/caddy/[email protected]/modules/caddyhttp/routes.go:331 +0xd2
github.com/caddyserver/caddy/v2/modules/caddyhttp.HandlerFunc.ServeHTTP(0x203a200?, {0x7fffb8897548?, 0xc0007c7900?}, 0xc000c272c0?)
github.com/caddyserver/caddy/[email protected]/modules/caddyhttp/caddyhttp.go:74 +0x29
github.com/caddyserver/caddy/v2/modules/caddyhttp.RouteList.Compile.wrapRoute.func1.1({0x7fffb8897548, 0xc0007c7900}, 0xc000c272c0)
github.com/caddyserver/caddy/[email protected]/modules/caddyhttp/routes.go:298 +0x24e
github.com/caddyserver/caddy/v2/modules/caddyhttp.HandlerFunc.ServeHTTP(0x1a4d940?, {0x7fffb8897548?, 0xc0007c7900?}, 0xc0003810e0?)
github.com/caddyserver/caddy/[email protected]/modules/caddyhttp/caddyhttp.go:74 +0x29
github.com/caddyserver/caddy/v2/modules/caddyhttp.(*Server).enforcementHandler(0x0?, {0x7fffb8897548?, 0xc0007c7900?}, 0xc0003810e0?, {0x203a200?, 0xc0005929c0?})
github.com/caddyserver/caddy/[email protected]/modules/caddyhttp/server.go:481 +0x24b
github.com/caddyserver/caddy/v2/modules/caddyhttp.(*App).Provision.(*Server).wrapPrimaryRoute.func2({0x7fffb8897548?, 0xc0007c7900?}, 0x4eee73?)
github.com/caddyserver/caddy/[email protected]/modules/caddyhttp/server.go:457 +0x35
github.com/caddyserver/caddy/v2/modules/caddyhttp.HandlerFunc.ServeHTTP(0xc0006c4500?, {0x7fffb8897548?, 0xc0007c7900?}, 0xc000c272c0?)
github.com/caddyserver/caddy/[email protected]/modules/caddyhttp/caddyhttp.go:74 +0x29
github.com/caddyserver/caddy/v2/modules/caddyhttp.(*Server).ServeHTTP(0xc0006d4008, {0x2049880, 0xc0005f89a0}, 0xc000c27040)
github.com/caddyserver/caddy/[email protected]/modules/caddyhttp/server.go:370 +0xc85
net/http.serverHandler.ServeHTTP({0xc0002a99e0?}, {0x2049880?, 0xc0005f89a0?}, 0x1?)
net/http/server.go:3301 +0x8e
net/http.(*conn).serve(0xc00038d320, {0x204cd40, 0xc0000b4660})
net/http/server.go:2102 +0x625
created by net/http.(*Server).Serve in goroutine 50
net/http/server.go:3454 +0x485
ghcr.io/jasonlovesdoggo/caddy-defender:latest sha:454d3d479c88