Publish Baby Bleichenbacher victim toy server

02-02-asymmetric.md

@@ -97,7 +97,7 @@ $ (pk, sk) \xleftarrow{R} G() $
 
 $ y \leftarrow F(pk,x) $
 
-$ x \leftarrow F^{-1}(sk,x) $
+$ x \leftarrow F^{-1}(sk,y) $
 
 --
 
@@ -308,7 +308,7 @@ $ \\quad m $
 
 У подслушивающих нас лиц на руках остались только $ u = g^{\alpha} \pmod{p} $ и $ v = g^{\beta} \pmod{p} $.
 
-* Могут ли они вычислить $ g^{\alpha} \pmod{p} $?
+* Могут ли они вычислить $ g^{\alpha\beta} \pmod{p} $?
 
 --
 

bleach/.gitignore

@@ -0,0 +1,18 @@
+.rebar3
+_*
+.eunit
+*.o
+*.beam
+*.plt
+*.swp
+*.swo
+.erlang.cookie
+ebin
+log
+erl_crash.dump
+.rebar
+logs
+_build
+.idea
+*.iml
+rebar3.crashdump

bleach/LICENSE

@@ -0,0 +1,191 @@
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+   7. Disclaimer of Warranty. Unless required by applicable law or
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+      Contributor provides its Contributions) on an "AS IS" BASIS,
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+   8. Limitation of Liability. In no event and under no legal theory,
+      whether in tort (including negligence), contract, or otherwise,
+      unless required by applicable law (such as deliberate and grossly
+      negligent acts) or agreed to in writing, shall any Contributor be
+      liable to You for damages, including any direct, indirect, special,
+      incidental, or consequential damages of any character arising as a
+      result of this License or out of the use or inability to use the
+      Work (including but not limited to damages for loss of goodwill,
+      work stoppage, computer failure or malfunction, or any and all
+      other commercial damages or losses), even if such Contributor
+      has been advised of the possibility of such damages.
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+   9. Accepting Warranty or Additional Liability. While redistributing
+      the Work or Derivative Works thereof, You may choose to offer,
+      and charge a fee for, acceptance of support, warranty, indemnity,
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+

bleach/README.md

@@ -0,0 +1,12 @@
+# bleach
+
+A toy server vulnerable to Baby Bleichenbacher attack.
+
+## Build
+
+    $ rebar3 release
+
+## Run
+
+    $ cd _build/default/rel/bleach
+    $ ./bin/bleach

bleach/config/sys.config

@@ -0,0 +1,7 @@
+[
+
+    {bleach, [
+        {keyfile, "var/secret.pem"}
+    ]}
+
+].

bleach/config/vm.args

@@ -0,0 +1,6 @@
+-sname bleach
+
+-setcookie bleach
+
++K true
++A 10

bleach/rebar.config

@@ -0,0 +1,28 @@
+{erl_opts, [debug_info]}.
+
+{deps, [
+    {cowboy, "2.4.0"},
+    {genlib, {git, "https://github.com/rbkmoney/genlib", master}}
+]}.
+
+{relx, [
+    {release, {'bleach', "0.1.0"}, [
+        bleach
+    ]},
+    {sys_config            , "./config/sys.config"},
+    {vm_args               , "./config/vm.args"},
+    {dev_mode              , true},
+    {include_erts          , false},
+    {extended_start_script , false},
+    %% wapi
+    {overlay, [
+        {mkdir , "var"},
+        {copy  , "var/secret.pem", "var/secret.pem"}
+    ]}
+]}.
+
+{overrides, [
+    {override, genlib, [
+        {erl_opts, [debug_info]}
+    ]}
+]}.

bleach/rebar.lock

@@ -0,0 +1,14 @@
+{"1.1.0",
+[{<<"cowboy">>,{pkg,<<"cowboy">>,<<"2.4.0">>},0},
+ {<<"cowlib">>,{pkg,<<"cowlib">>,<<"2.3.0">>},1},
+ {<<"genlib">>,
+  {git,"https://github.com/rbkmoney/genlib",
+       {ref,"8501050c19e5a36063cf0ae0d181245662bdfa32"}},
+  0},
+ {<<"ranch">>,{pkg,<<"ranch">>,<<"1.5.0">>},1}]}.
+[
+{pkg_hash,[
+ {<<"cowboy">>, <<"F1B72FABE9C8A5FC64AC5AC85FB65474D64733D1DF52A26FAD5D4BA3D9F70A9F">>},
+ {<<"cowlib">>, <<"BBD58EF537904E4F7C1DD62E6AA8BC831C8183CE4EFA9BD1150164FE15BE4CAA">>},
+ {<<"ranch">>, <<"F04166F456790FEE2AC1AA05A02745CC75783C2BFB26D39FAF6AEFC9A3D3A58A">>}]}
+].

bleach/src/bleach.app.src

@@ -0,0 +1,19 @@
+{application, bleach, [
+    {description, "A toy server vulnerable to baby Bleichenbacher attack"},
+    {vsn, "0.1.0"},
+    {registered, []},
+    {mod, {bleach_app, []}},
+    {applications, [
+        kernel,
+        stdlib,
+        cowboy,
+        genlib,
+        crypto,
+        public_key
+    ]},
+    {env,[]},
+    {modules, []},
+    {maintainers, []},
+    {licenses, ["Apache 2.0"]},
+    {links, []}
+]}.

bleach/src/bleach_app.erl

@@ -0,0 +1,20 @@
+-module(bleach_app).
+
+-behaviour(application).
+
+%% Application callbacks
+-export([start/2, stop/1]).
+
+%% API
+
+-spec start(_StartType, _StartArgs) ->
+    {ok, pid()}.
+
+start(_StartType, _StartArgs) ->
+    bleach_sup:start_link().
+
+-spec stop(_) ->
+    ok.
+
+stop(_State) ->
+    ok.

bleach/src/bleach_crypto.erl

@@ -0,0 +1,24 @@
+-module(bleach_crypto).
+
+-export([decrypt/2]).
+
+-type ct() :: binary().
+-type pt() :: binary().
+-type sk() :: public_key:rsa_private_key().
+
+%%
+
+-include_lib("public_key/include/public_key.hrl").
+
+-spec decrypt(ct(), sk()) ->
+    pt().
+
+decrypt(Ct, Sk) ->
+    Pt = public_key:decrypt_private(Ct, Sk, [{rsa_pad, rsa_no_padding}]),
+    interpret(
+        binary:decode_unsigned(Pt),
+        Sk#'RSAPrivateKey'.modulus
+    ).
+
+interpret(Pt, N) when N div 2 > Pt ->
+    Pt.

bleach/src/bleach_handler.erl

@@ -0,0 +1,37 @@
+-module(bleach_handler).
+
+-export([init/2]).
+
+%%
+
+-spec init(cowboy_req:req(), Opts) ->
+    {ok, cowboy_req:req(), Opts}.
+
+init(Req0, Opts) ->
+    Req = case cowboy_req:method(Req0) of
+        <<"POST">> ->
+            handle_body(Req0, Opts);
+        _ ->
+            cowboy_req:reply(405, Req0)
+    end,
+    {ok, Req, Opts}.
+
+handle_body(Req0, Opts) ->
+    case cowboy_req:read_urlencoded_body(Req0) of
+        {ok, Vs, Req} ->
+            handle_ciphertext(proplists:get_value(<<"ct">>, Vs), Req, Opts);
+        _ ->
+            cowboy_req:reply(400, Req0)
+    end.
+
+handle_ciphertext(CT0, Req0, Opts) when is_binary(CT0) ->
+    try
+        CT1 = genlib_format:hex_to_binary(CT0),
+        _V = bleach_crypto:decrypt(CT1, maps:get(sk, Opts)),
+        cowboy_req:reply(204, Req0)
+    catch error:badarg ->
+        cowboy_req:reply(400, Req0)
+    end;
+
+handle_ciphertext(undefined, Req0, _Opts) ->
+    cowboy_req:reply(400, Req0).

bleach/src/bleach_sup.erl

@@ -0,0 +1,60 @@
+-module(bleach_sup).
+
+-behaviour(supervisor).
+
+%% API
+-export([start_link/0]).
+
+%% Supervisor callbacks
+-export([init/1]).
+
+-define(SERVER, ?MODULE).
+
+%% API functions
+
+-spec start_link() ->
+    {ok, pid()}.
+
+start_link() ->
+    supervisor:start_link(?MODULE, []).
+
+%% Supervisor callbacks
+
+-spec init([]) ->
+    {ok, {supervisor:sup_flags(), [supervisor:child_spec()]}}.
+
+init([]) ->
+    Flags = #{strategy => one_for_all},
+    {ok, {Flags, [get_cowboy_child_spec({0, 0, 0, 0}, 8008)]}}.
+
+get_cowboy_child_spec(IP, Port) ->
+    Sk = read_secret_key(),
+    Dispatch = cowboy_router:compile([
+        {'_', [
+            {"/", bleach_handler, #{sk => Sk}}
+        ]}
+    ]),
+    ranch:child_spec(
+        ?SERVER,
+        ranch_tcp,
+        [
+            {ip, IP},
+            {port, Port},
+            {num_acceptors, 4}
+        ],
+        cowboy_clear,
+        #{
+            env => #{dispatch => Dispatch}
+        }
+    ).
+
+%%
+
+-include_lib("public_key/include/public_key.hrl").
+
+read_secret_key() ->
+    {ok, Path} = application:get_env(bleach, keyfile),
+    {ok, Bytes} = file:read_file(Path),
+    [Entry] = public_key:pem_decode(Bytes),
+    Sk = #'RSAPrivateKey'{} = public_key:pem_entry_decode(Entry),
+    Sk.

bleach/var/ct

@@ -0,0 +1 @@
+uáLfÌÂS5„Øt.Oøl¤<1D>ÝÞJ¶¢ñ		Ÿ€Ã{<7B>Üe° ªÁ€,Š¾²(Ú‰K_gˆPõJˆ<4A>ÆL<C386>ÌÒkBñrZmJ$ÜÐ}i‡}”¯¿ÎDˆèàÊB¤
ª½gdˆÒ¤ì[ßQˤˆÄô+í?W¯­á•l

bleach/var/public.pem

@@ -0,0 +1,6 @@
+-----BEGIN PUBLIC KEY-----
+MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQC6PxK1aapUNRW0okRFg2qWVUDW
+ejg0Pco2Zg3W/t36b3E4lEXSR42/p1Izto82u7uOYLo0ZRGSlODgKMmnRnWp3G04
+JMsasIwICTUlk/ea/Hn2z6aFq7b6Q6+/1Ye6YZBJsxn40+43IE+ipt/hOzaCk9N7
+qHzLCRuw1N4gZ/p8YQIDAQAB
+-----END PUBLIC KEY-----

bleach/var/secret.pem

@@ -0,0 +1,16 @@
+-----BEGIN RSA PRIVATE KEY-----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+-----END RSA PRIVATE KEY-----
+