mirror of
https://github.com/seriyps/mtproto_proxy.git
synced 2026-09-22 04:34:41 +00:00
116 lines
4.4 KiB
Erlang
116 lines
4.4 KiB
Erlang
%% @doc Property-based tests for mtp_codec
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-module(prop_mtp_codec).
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-include_lib("proper/include/proper.hrl").
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-include_lib("stdlib/include/assert.hrl").
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-export([prop_obfuscated_secure_stream/1,
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prop_obfuscated_secure_duplex/1,
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prop_obfuscated_secure_duplex_multi/1]).
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prop_obfuscated_secure_stream(doc) ->
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"Tests that any number of packets can be encrypted and decrypted with codec that includes"
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" combination of mtp_obfuscated and mtp_secure".
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prop_obfuscated_secure_stream() ->
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?FORALL({Key, Iv, Stream}, stream_arg_set(), obfuscated_secure_stream(Key, Iv, Stream)).
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stream_arg_set() ->
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proper_types:tuple(
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[mtp_prop_gen:key(),
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mtp_prop_gen:iv(),
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mtp_prop_gen:stream_4b()
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]).
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obfuscated_secure_stream(Key, Iv, Stream) ->
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Codec0 = mk_codec(Key, Iv, Key, Iv),
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{BinStream, Codec2} =
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lists:foldl(
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fun(Bin, {Acc, Codec1}) ->
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{Data, Codec2} = mtp_codec:encode_packet(Bin, Codec1),
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{<<Acc/binary, (iolist_to_binary(Data))/binary>>,
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Codec2}
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end, {<<>>, Codec0}, Stream),
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{ok, RevStream, _Codec3} =
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mtp_codec:fold_packets(
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fun(Decoded, Acc, Codec3) ->
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{[Decoded | Acc], Codec3}
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end, [], BinStream, Codec2),
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Stream == lists:reverse(RevStream).
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prop_obfuscated_secure_duplex(doc) ->
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"Tests that any number of packets can be encrypted and decrypted in both directions using"
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" a pair of keys with codec that uses combination of mtp_obfuscated and mtp_secure".
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prop_obfuscated_secure_duplex() ->
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?FORALL({TxKey, TxIv, RxKey, RxIv, Stream}, duplex_arg_set(),
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obfuscated_secure_duplex(TxKey, TxIv, RxKey, RxIv, Stream)).
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duplex_arg_set() ->
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{mtp_prop_gen:key(),
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mtp_prop_gen:iv(),
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mtp_prop_gen:key(),
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mtp_prop_gen:iv(),
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mtp_prop_gen:stream_4b()}.
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obfuscated_secure_duplex(TxKey, TxIv, RxKey, RxIv, Stream) ->
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CliCodec0 = mk_codec(TxKey, TxIv, RxKey, RxIv),
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SrvCodec0 = mk_codec(RxKey, RxIv, TxKey, TxIv),
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{_, _, BackStream} = roundtrip(CliCodec0, SrvCodec0, Stream),
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Stream == BackStream.
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prop_obfuscated_secure_duplex_multi(doc) ->
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"Tests that any number of packets can be encrypted and decrypted in both directions multiple"
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" times using a pair of keys with codec that uses combination of mtp_obfuscated and"
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" mtp_secure".
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prop_obfuscated_secure_duplex_multi() ->
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?FORALL({N, {TxKey, TxIv, RxKey, RxIv, Stream}}, {proper_types:range(1, 100), duplex_arg_set()},
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obfuscated_secure_duplex_multi(N, TxKey, TxIv, RxKey, RxIv, Stream)).
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obfuscated_secure_duplex_multi(N, TxKey, TxIv, RxKey, RxIv, Stream0) ->
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CliCodec0 = mk_codec(TxKey, TxIv, RxKey, RxIv),
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SrvCodec0 = mk_codec(RxKey, RxIv, TxKey, TxIv),
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{_, _, Stream} =
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lists:foldl(
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fun(I, {CliCodec1, SrvCodec1, Stream1}) ->
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{_, _, BackStream} = Res = roundtrip(CliCodec1, SrvCodec1, Stream1),
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?assertEqual(Stream0, BackStream, [{trip_i, I}]),
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Res
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end, {CliCodec0, SrvCodec0, Stream0}, lists:seq(1, N)),
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Stream0 == Stream.
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%% Helpers
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roundtrip(CliCodec0, SrvCodec0, Stream) ->
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%% Client creates a stream of bytes
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{CliBinStream, CliCodec1} =
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lists:foldl(
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fun(Bin, {Acc, Codec1}) ->
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{Data, Codec2} = mtp_codec:encode_packet(Bin, Codec1),
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{<<Acc/binary, (iolist_to_binary(Data))/binary>>,
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Codec2}
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end, {<<>>, CliCodec0}, Stream),
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%% Server decodes stream of bytes and immediately "sends" them back
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{ok, SrvBinStream, SrvCodec1} =
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mtp_codec:fold_packets(
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fun(Decoded, Acc, Codec1) ->
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{Encoded, Codec2} = mtp_codec:encode_packet(Decoded, Codec1),
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{<<Acc/binary, (iolist_to_binary(Encoded))/binary>>, Codec2}
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end, <<>>, CliBinStream, SrvCodec0),
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%% Client "receives" and decodes what server sent
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{ok, RevCliDecodedStream, CliCodec2} =
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mtp_codec:fold_packets(
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fun(Decoded, Acc, Codec1) ->
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{[Decoded | Acc], Codec1}
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end, [], SrvBinStream, CliCodec1),
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{CliCodec2, SrvCodec1, lists:reverse(RevCliDecodedStream)}.
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mk_codec(EncKey, EncIv, DecKey, DecIv) ->
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Crypto = mtp_obfuscated:new(EncKey, EncIv, DecKey, DecIv),
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Packet = mtp_secure:new(),
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mtp_codec:new(mtp_obfuscated, Crypto,
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mtp_secure, Packet).
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