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fix: prevent HEAD requests from writing body in streamhandler #1113

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fix: prevent HEAD requests from writing body in streamhandler #1113

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4099389
fix: prevent HEAD requests from writing body
pankgeorg Sep 20, 2023
98b1536
Merge branch 'master' into pg/HEAD-no-body-4
pankgeorg Nov 23, 2023
64d36e2
test: test that HEAD requests don't have return a body
pankgeorg Dec 6, 2023
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4 changes: 3 additions & 1 deletion src/Handlers.jl
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Original file line number Diff line number Diff line change
Expand Up @@ -58,7 +58,9 @@ function streamhandler(handler)
request.response::Response = handler(request)
request.response.request = request
startwrite(stream)
write(stream, request.response.body)
if request.method != "HEAD"
write(stream, request.response.body)
end
return
end
end
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19 changes: 19 additions & 0 deletions test/server.jl
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Expand Up @@ -313,4 +313,23 @@ end # @testset
@test occursin(r"^\*/\* text/plain HEAD / HTTP/1\.1 HEAD / 127\.0\.0\.1 \d+ - HTTP/1\.1 \d{4}-\d{2}-\d{2}T\d{2}:\d{2}:\d{2}.* \d+/.*/\d{4}:\d{2}:\d{2}:\d{2}.* 200 0$", logs[4].message)
end

@testset "HEAD request without body" begin
sometext = "This is a big body that we don't want returned during a head"
handler = req -> begin
return HTTP.Response(200, [], sometext)
end
server = HTTP.serve!(handler; listenany=true)
port = HTTP.port(server)

response = HTTP.head("http://localhost:$port")
@test response.status == 200
@test String(response.body) == ""

response = HTTP.get("http://localhost:$port")
@test response.status == 200
@test String(response.body) == sometext

close(server)
end
Comment on lines +316 to +333
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The very interesting thing here is that this fails with

HEAD request without body: Error During Test at /home/pgeorgakopoulos/pluto/HTTP.jl/test/server.jl:316
  Got exception outside of a @test
  HTTP.RequestError:
  HTTP.Request:
  HTTP.Messages.Request:
  """
  GET / HTTP/1.1
  Host: localhost:8081
  Accept: */*
  User-Agent: HTTP.jl/1.10.0-rc1
  Content-Length: 0
  Accept-Encoding: gzip
  
  """Underlying error:
  HTTP.Parsers.ParseError(:INVALID_STATUS_LINE, "2e\r")
...
caused by: TaskFailedException
  
      nested task error: HTTP.Parsers.ParseError(:INVALID_STATUS_LINE, "2e\r")
...

caused by: HTTP.Parsers.ParseError(:INVALID_STATUS_LINE, "This is a big body that we don't want returnedHTTP/1.1 200 OK\r")
      Stacktrace:
       [1] parse_status_line!(bytes::String, response::HTTP.Messages.Response)
         @ HTTP.Parsers ~/pluto/HTTP.jl/src/Parsers.jl:206

without this PR

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which is very similar to a request smuggling attack.


end # module
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