%% Copyright (c) 2018, Loïc Hoguin <[email protected]>
%%
%% Permission to use, copy, modify, and/or distribute this software for any
%% purpose with or without fee is hereby granted, provided that the above
%% copyright notice and this permission notice appear in all copies.
%%
%% THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
%% WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
%% MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
%% ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
%% WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
%% ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
%% OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
-module(security_SUITE).
-compile(export_all).
-compile(nowarn_export_all).
-import(ct_helper, [config/2]).
-import(ct_helper, [doc/1]).
-import(cowboy_test, [gun_open/1]).
-import(cowboy_test, [raw_open/1]).
-import(cowboy_test, [raw_send/2]).
-import(cowboy_test, [raw_recv_head/1]).
-import(cowboy_test, [raw_recv/3]).
%% ct.
all() ->
cowboy_test:common_all().
groups() ->
Tests = [nc_rand, nc_zero],
H1Tests = [slowloris, slowloris_chunks],
H2CTests = [
http2_data_dribble,
http2_empty_frame_flooding_data,
http2_empty_frame_flooding_headers_continuation,
http2_empty_frame_flooding_push_promise,
http2_ping_flood,
http2_reset_flood,
http2_settings_flood,
http2_zero_length_header_leak
],
[
{http, [parallel], Tests ++ H1Tests},
{https, [parallel], Tests ++ H1Tests},
{h2, [parallel], Tests},
{h2c, [parallel], Tests ++ H2CTests},
{http_compress, [parallel], Tests ++ H1Tests},
{https_compress, [parallel], Tests ++ H1Tests},
{h2_compress, [parallel], Tests},
{h2c_compress, [parallel], Tests ++ H2CTests}
].
init_per_suite(Config) ->
ct_helper:create_static_dir(config(priv_dir, Config) ++ "/static"),
Config.
end_per_suite(Config) ->
ct_helper:delete_static_dir(config(priv_dir, Config) ++ "/static").
init_per_group(Name, Config) ->
cowboy_test:init_common_groups(Name, Config, ?MODULE).
end_per_group(Name, _) ->
cowboy:stop_listener(Name).
%% Routes.
init_dispatch(_) ->
cowboy_router:compile([{"localhost", [
{"/", hello_h, []},
{"/echo/:key", echo_h, []},
{"/long_polling", long_polling_h, []},
{"/resp/:key[/:arg]", resp_h, []}
]}]).
%% Tests.
http2_data_dribble(Config) ->
doc("Request a very large response then update the window 1 byte at a time. (CVE-2019-9511)"),
{ok, Socket} = rfc7540_SUITE:do_handshake(Config),
%% Send a GET request for a very large response.
{HeadersBlock, _} = cow_hpack:encode([
{<<":method">>, <<"GET">>},
{<<":scheme">>, <<"http">>},
{<<":authority">>, <<"localhost">>}, %% @todo Correct port number.
{<<":path">>, <<"/resp/stream_body/loop">>}
]),
ok = gen_tcp:send(Socket, cow_http2:headers(1, fin, HeadersBlock)),
%% Receive a response with a few DATA frames draining the window.
{ok, <<SkipLen:24, 1:8, _:8, 1:32>>} = gen_tcp:recv(Socket, 9, 1000),
{ok, _} = gen_tcp:recv(Socket, SkipLen, 1000),
{ok, <<16384:24, 0:8, 0:8, 1:32, _:16384/unit:8>>} = gen_tcp:recv(Socket, 9 + 16384, 1000),
{ok, <<16384:24, 0:8, 0:8, 1:32, _:16384/unit:8>>} = gen_tcp:recv(Socket, 9 + 16384, 1000),
{ok, <<16384:24, 0:8, 0:8, 1:32, _:16384/unit:8>>} = gen_tcp:recv(Socket, 9 + 16384, 1000),
{ok, <<16383:24, 0:8, 0:8, 1:32, _:16383/unit:8>>} = gen_tcp:recv(Socket, 9 + 16383, 1000),
%% Send WINDOW_UPDATE frames with a value of 1. The server should
%% not attempt to send data until the window is over a configurable threshold.
ok = gen_tcp:send(Socket, [
cow_http2:window_update(1),
cow_http2:window_update(1, 1)
]),
{error, timeout} = gen_tcp:recv(Socket, 0, 1000),
ok.
http2_empty_frame_flooding_data(Config) ->
doc("Confirm that Cowboy detects empty DATA frame flooding. (CVE-2019-9518)"),
{ok, Socket} = rfc7540_SUITE:do_handshake(Config),
%% Send a POST request followed by many empty DATA frames.
{HeadersBlock, _} = cow_hpack:encode([
{<<":method">>, <<"POST">>},
{<<":scheme">>, <<"http">>},
{<<":authority">>, <<"localhost">>}, %% @todo Correct port number.
{<<":path">>, <<"/echo/read_body">>}
]),
ok = gen_tcp:send(Socket, cow_http2:headers(1, nofin, HeadersBlock)),
_ = [gen_tcp:send(Socket, cow_http2:data(1, nofin, <<>>)) || _ <- lists:seq(1, 20000)],
%% When Cowboy detects a flood it must close the connection.
%% We skip WINDOW_UPDATE frames sent when Cowboy starts to read the body.
case gen_tcp:recv(Socket, 43, 6000) of
{ok, <<_:26/unit:8, _:24, 7:8, _:72, 11:32>>} ->
ok;
%% We also accept the connection being closed immediately,
%% which may happen because we send the GOAWAY right before closing.
{error, closed} ->
ok
end.
http2_empty_frame_flooding_headers_continuation(Config) ->
doc("Confirm that Cowboy detects empty HEADERS/CONTINUATION frame flooding. (CVE-2019-9518)"),
{ok, Socket} = rfc7540_SUITE:do_handshake(Config),
%% Send many empty HEADERS/CONTINUATION frames before the headers.
ok = gen_tcp:send(Socket, <<0:24, 1:8, 0:9, 1:31>>),
_ = [gen_tcp:send(Socket, <<0:24, 9:8, 0:9, 1:31>>) || _ <- lists:seq(1, 20000)],
{HeadersBlock, _} = cow_hpack:encode([
{<<":method">>, <<"POST">>},
{<<":scheme">>, <<"http">>},
{<<":authority">>, <<"localhost">>}, %% @todo Correct port number.
{<<":path">>, <<"/">>}
]),
Len = iolist_size(HeadersBlock),
_ = gen_tcp:send(Socket, [<<Len:24, 9:8, 0:5, 1:1, 0:1, 1:1, 0:1, 1:31>>, HeadersBlock]),
%% When Cowboy detects a flood it must close the connection.
case gen_tcp:recv(Socket, 17, 6000) of
{ok, <<_:24, 7:8, _:72, 11:32>>} ->
ok;
%% We also accept the connection being closed immediately,
%% which may happen because we send the GOAWAY right before closing.
{error, closed} ->
ok
end.
http2_empty_frame_flooding_push_promise(Config) ->
doc("Confirm that Cowboy detects empty PUSH_PROMISE frame flooding. (CVE-2019-9518)"),
{ok, Socket} = rfc7540_SUITE:do_handshake(Config),
%% Send a HEADERS frame to which we will attach a PUSH_PROMISE.
%% We use nofin in order to keep the stream alive.
{HeadersBlock, _} = cow_hpack:encode([
{<<":method">>, <<"GET">>},
{<<":scheme">>, <<"http">>},
{<<":authority">>, <<"localhost">>}, %% @todo Correct port number.
{<<":path">>, <<"/long_polling">>}
]),
ok = gen_tcp:send(Socket, cow_http2:headers(1, nofin, HeadersBlock)),
%% Send nofin PUSH_PROMISE frame without any data.
ok = gen_tcp:send(Socket, <<4:24, 5:8, 0:8, 0:1, 1:31, 0:1, 3:31>>),
%% Receive a PROTOCOL_ERROR connection error.
%%
%% Cowboy rejects all PUSH_PROMISE frames therefore no flooding
%% can take place.
{ok, <<_:24, 7:8, _:72, 1:32>>} = gen_tcp:recv(Socket, 17, 6000),
ok.
%% @todo http2_internal_data_buffering(Config) -> I do not know how to test this.
% doc("Request many very large responses, with a larger than necessary window size, "
% "but do not attempt to read from the socket. (CVE-2019-9517)"),
http2_ping_flood(Config) ->
doc("Confirm that Cowboy detects PING floods. (CVE-2019-9512)"),
{ok, Socket} = rfc7540_SUITE:do_handshake(Config),
%% Flood the server with PING frames.
_ = [gen_tcp:send(Socket, cow_http2:ping(0)) || _ <- lists:seq(1, 20000)],
%% Receive a number of PING ACK frames in return, following by the closing of the connection.
try
[case gen_tcp:recv(Socket, 17, 6000) of
{ok, <<8:24, 6:8, _:7, 1:1, _:32, 0:64>>} -> ok;
{ok, <<_:24, 7:8, _:72, 11:32>>} -> throw(goaway);
%% We also accept the connection being closed immediately,
%% which may happen because we send the GOAWAY right before closing.
{error, closed} -> throw(goaway)
end || _ <- lists:seq(1, 20000)],
error(flood_successful)
catch throw:goaway ->
ok
end.
http2_reset_flood(Config) ->
doc("Confirm that Cowboy detects reset floods. (CVE-2019-9514)"),
{ok, Socket} = rfc7540_SUITE:do_handshake(Config),
%% Flood the server with HEADERS frames without a :method pseudo-header.
{HeadersBlock, _} = cow_hpack:encode([
{<<":scheme">>, <<"http">>},
{<<":authority">>, <<"localhost">>}, %% @todo Correct port number.
{<<":path">>, <<"/">>}
]),
_ = [gen_tcp:send(Socket, cow_http2:headers(ID, fin, HeadersBlock)) || ID <- lists:seq(1, 100, 2)],
%% Receive a number of RST_STREAM frames in return, following by the closing of the connection.
try
[case gen_tcp:recv(Socket, 13, 6000) of
{ok, <<_:24, 3:8, _:8, ID:32, 1:32>>} -> ok;
{ok, <<_:24, 7:8, _:72>>} ->
{ok, <<11:32>>} = gen_tcp:recv(Socket, 4, 1000),
throw(goaway);
%% We also accept the connection being closed immediately,
%% which may happen because we send the GOAWAY right before closing.
{error, closed} ->
throw(goaway)
end || ID <- lists:seq(1, 100, 2)],
error(flood_successful)
catch throw:goaway ->
ok
end.
%% @todo If we ever implement the PRIORITY mechanism, this test should
%% be implemented as well. CVE-2019-9513 https://www.kb.cert.org/vuls/id/605641/
%% http2_resource_loop
http2_settings_flood(Config) ->
doc("Confirm that Cowboy detects SETTINGS floods. (CVE-2019-9515)"),
{ok, Socket} = rfc7540_SUITE:do_handshake(Config),
%% Flood the server with empty SETTINGS frames.
_ = [gen_tcp:send(Socket, cow_http2:settings(#{})) || _ <- lists:seq(1, 20000)],
%% Receive a number of SETTINGS ACK frames in return, following by the closing of the connection.
try
[case gen_tcp:recv(Socket, 9, 6000) of
{ok, <<0:24, 4:8, 0:7, 1:1, 0:32>>} -> ok;
{ok, <<_:24, 7:8, _:40>>} ->
{ok, <<_:32, 11:32>>} = gen_tcp:recv(Socket, 8, 1000),
throw(goaway);
%% We also accept the connection being closed immediately,
%% which may happen because we send the GOAWAY right before closing.
{error, closed} ->
throw(goaway)
end || _ <- lists:seq(1, 20000)],
error(flood_successful)
catch throw:goaway ->
ok
end.
http2_zero_length_header_leak(Config) ->
doc("Confirm that Cowboy rejects HEADERS frame with a 0-length header name. (CVE-2019-9516)"),
{ok, Socket} = rfc7540_SUITE:do_handshake(Config),
%% Send a GET request with a 0-length header name.
{HeadersBlock, _} = cow_hpack:encode([
{<<":method">>, <<"GET">>},
{<<":scheme">>, <<"http">>},
{<<":authority">>, <<"localhost">>}, %% @todo Correct port number.
{<<":path">>, <<"/">>},
{<<>>, <<"CVE-2019-9516">>}
]),
ok = gen_tcp:send(Socket, cow_http2:headers(1, fin, HeadersBlock)),
%% Receive a PROTOCOL_ERROR stream error.
{ok, <<_:24, 3:8, _:8, 1:32, 1:32>>} = gen_tcp:recv(Socket, 13, 6000),
ok.
nc_rand(Config) ->
doc("Throw random garbage at the server, then check if it's still up."),
do_nc(Config, "/dev/urandom").
nc_zero(Config) ->
doc("Throw zeroes at the server, then check if it's still up."),
do_nc(Config, "/dev/zero").
do_nc(Config, Input) ->
Cat = os:find_executable("cat"),
Nc = os:find_executable("nc"),
case {Cat, Nc} of
{false, _} ->
{skip, "The cat executable was not found."};
{_, false} ->
{skip, "The nc executable was not found."};
_ ->
StrPort = integer_to_list(config(port, Config)),
_ = [
os:cmd("cat " ++ Input ++ " | nc localhost " ++ StrPort)
|| _ <- lists:seq(1, 100)],
ConnPid = gun_open(Config),
Ref = gun:get(ConnPid, "/"),
{response, _, 200, _} = gun:await(ConnPid, Ref),
ok
end.
slowloris(Config) ->
doc("Send request headers one byte at a time. "
"Confirm that the connection gets closed."),
Client = raw_open(Config),
try
[begin
ok = raw_send(Client, [C]),
timer:sleep(250)
end || C <- "GET / HTTP/1.1\r\nHost: localhost\r\n"
"User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.0; en-US)\r\n"
"Cookie: name=aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa\r\n\r\n"],
error(failure)
catch error:{badmatch, _} ->
ok
end.
slowloris_chunks(Config) ->
doc("Send request headers one line at a time. "
"Confirm that the connection gets closed."),
Client = raw_open(Config),
ok = raw_send(Client, "GET / HTTP/1.1\r\n"),
timer:sleep(300),
ok = raw_send(Client, "Host: localhost\r\n"),
timer:sleep(300),
Data = raw_recv_head(Client),
{'HTTP/1.1', 408, _, Rest} = cow_http:parse_status_line(Data),
{Headers, _} = cow_http:parse_headers(Rest),
{_, <<"close">>} = lists:keyfind(<<"connection">>, 1, Headers),
{error, closed} = raw_recv(Client, 0, 1000).
