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-rw-r--r--src/cowboy_protocol.erl30
1 files changed, 19 insertions, 11 deletions
diff --git a/src/cowboy_protocol.erl b/src/cowboy_protocol.erl
index 71632ae..bf81e52 100644
--- a/src/cowboy_protocol.erl
+++ b/src/cowboy_protocol.erl
@@ -24,6 +24,8 @@
%% Defaults to 64.</dd>
%% <dt>max_header_value_length</dt><dd>Max length allowed for header values.
%% Defaults to 4096.</dd>
+%% <dt>max_headers</dt><dd>Max number of headers allowed.
+%% Defaults to 100.</dd>
%% <dt>max_keepalive</dt><dd>Max number of requests allowed in a single
%% keep-alive session. Defaults to infinity.</dd>
%% <dt>max_request_line_length</dt><dd>Max length allowed for the request
@@ -66,12 +68,13 @@
dispatch :: cowboy_dispatcher:dispatch_rules(),
onrequest :: undefined | onrequest_fun(),
onresponse = undefined :: undefined | onresponse_fun(),
- max_empty_lines :: integer(),
- req_keepalive = 1 :: integer(),
- max_keepalive :: integer(),
- max_request_line_length :: integer(),
- max_header_name_length :: integer(),
- max_header_value_length :: integer(),
+ max_empty_lines :: non_neg_integer(),
+ req_keepalive = 1 :: non_neg_integer(),
+ max_keepalive :: non_neg_integer(),
+ max_request_line_length :: non_neg_integer(),
+ max_header_name_length :: non_neg_integer(),
+ max_header_value_length :: non_neg_integer(),
+ max_headers :: non_neg_integer(),
timeout :: timeout(),
hibernate = false :: boolean(),
loop_timeout = infinity :: timeout(),
@@ -103,6 +106,7 @@ init(ListenerPid, Socket, Transport, Opts) ->
MaxEmptyLines = get_value(max_empty_lines, Opts, 5),
MaxHeaderNameLength = get_value(max_header_name_length, Opts, 64),
MaxHeaderValueLength = get_value(max_header_value_length, Opts, 4096),
+ MaxHeaders = get_value(max_headers, Opts, 100),
MaxKeepalive = get_value(max_keepalive, Opts, infinity),
MaxRequestLineLength = get_value(max_request_line_length, Opts, 4096),
OnRequest = get_value(onrequest, Opts, undefined),
@@ -114,7 +118,7 @@ init(ListenerPid, Socket, Transport, Opts) ->
max_empty_lines=MaxEmptyLines, max_keepalive=MaxKeepalive,
max_request_line_length=MaxRequestLineLength,
max_header_name_length=MaxHeaderNameLength,
- max_header_value_length=MaxHeaderValueLength,
+ max_header_value_length=MaxHeaderValueLength, max_headers=MaxHeaders,
timeout=Timeout, onrequest=OnRequest, onresponse=OnResponse}, 0).
%% Request parsing.
@@ -145,7 +149,7 @@ parse_request(Buffer, State=#state{max_request_line_length=MaxLength,
max_empty_lines=MaxEmpty}, ReqEmpty) ->
case binary:match(Buffer, <<"\n">>) of
nomatch when byte_size(Buffer) > MaxLength ->
- error_terminate(413, State);
+ error_terminate(414, State);
nomatch ->
wait_request(Buffer, State, ReqEmpty);
{1, _} when ReqEmpty =:= MaxEmpty ->
@@ -213,6 +217,10 @@ parse_version(<< "HTTP/1.0\r\n", Rest/bits >>, S, M, P, Q, F) ->
parse_version(_, State, _, _, _, _) ->
error_terminate(505, State).
+%% Stop receiving data if we have more than allowed number of headers.
+wait_header(_, State=#state{max_headers=MaxHeaders}, _, _, _, _, _, Headers)
+ when length(Headers) >= MaxHeaders ->
+ error_terminate(400, State);
wait_header(Buffer, State=#state{socket=Socket, transport=Transport,
timeout=Timeout}, M, P, Q, F, V, H) ->
case Transport:recv(Socket, 0, Timeout) of
@@ -231,7 +239,7 @@ parse_header(Buffer, State=#state{max_header_name_length=MaxLength},
M, P, Q, F, V, H) ->
case binary:match(Buffer, <<":">>) of
nomatch when byte_size(Buffer) > MaxLength ->
- error_terminate(413, State);
+ error_terminate(400, State);
nomatch ->
wait_header(Buffer, State, M, P, Q, F, V, H);
{_, _} ->
@@ -306,7 +314,7 @@ parse_hd_before_value(Buffer, State=#state{
max_header_value_length=MaxLength}, M, P, Q, F, V, H, N) ->
case binary:match(Buffer, <<"\n">>) of
nomatch when byte_size(Buffer) > MaxLength ->
- error_terminate(413, State);
+ error_terminate(400, State);
nomatch ->
wait_hd_before_value(Buffer, State, M, P, Q, F, V, H, N);
{_, _} ->
@@ -359,7 +367,7 @@ parse_hd_value(<< C, Rest/bits >>, S, M, P, Q, F, V, H, N, SoFar) ->
parse_hd_value(Rest, S, M, P, Q, F, V, H, N, << SoFar/binary, C >>);
parse_hd_value(<<>>, State=#state{max_header_value_length=MaxLength},
_, _, _, _, _, _, _, SoFar) when byte_size(SoFar) > MaxLength ->
- error_terminate(413, State);
+ error_terminate(400, State);
parse_hd_value(<<>>, S, M, P, Q, F, V, H, N, SoFar) ->
wait_hd_value(<<>>, S, M, P, Q, F, V, H, N, SoFar).