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fix(ft): make `fin` packet parser stricter + safer

This commit is contained in:
Andrew Mayorov 2023-02-17 19:32:23 +03:00 committed by Ilya Averyanov
parent 58115715dd
commit 2cf2a2d952
1 changed files with 13 additions and 6 deletions
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19
apps/emqx_ft/src/emqx_ft.erl
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@ -146,11 +146,14 @@ on_file_command(PacketId, Msg, FileCommand) ->
case string:split(FileCommand, <<"/">>, all) of
[FileId, <<"init">>] ->
on_init(PacketId, Msg, transfer(Msg, FileId));
[FileId, <<"fin">>, FinalSizeBin | ChecksumL] ->
validate([{size, FinalSizeBin}], fun([FinalSize]) ->
Checksum = emqx_maybe:from_list(ChecksumL),
on_fin(PacketId, Msg, transfer(Msg, FileId), FinalSize, Checksum)
end);
[FileId, <<"fin">>, FinalSizeBin | MaybeChecksum] when length(MaybeChecksum) =< 1 ->
ChecksumBin = emqx_maybe:from_list(MaybeChecksum),
validate(
[{size, FinalSizeBin}, {{maybe, checksum}, ChecksumBin}],
fun([FinalSize, Checksum]) ->
on_fin(PacketId, Msg, transfer(Msg, FileId), FinalSize, Checksum)
end
);
[FileId, <<"abort">>] ->
on_abort(Msg, transfer(Msg, FileId));
[FileId, OffsetBin] ->
@ -375,7 +378,11 @@ do_validate([{checksum, Checksum} | Rest], Parsed) ->
do_validate(Rest, [Bin | Parsed]);
{error, _Reason} ->
{error, {invalid_checksum, Checksum}}
end.
end;
do_validate([{{maybe, _}, undefined} | Rest], Parsed) ->
do_validate(Rest, [undefined | Parsed]);
do_validate([{{maybe, T}, Value} | Rest], Parsed) ->
do_validate([{T, Value} | Rest], Parsed).
parse_checksum(Checksum) when is_binary(Checksum) andalso byte_size(Checksum) =:= 64 ->
try