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authorIngela Anderton Andin <[email protected]>2015-01-27 17:00:28 +0100
committerIngela Anderton Andin <[email protected]>2015-01-29 15:50:44 +0100
commit4eeeca1538afecc294e04c50c5f6a4551eced9ec (patch)
tree612c0a7cf76a5beccbf015a388437435cace8bd1 /lib/inets/src/http_server
parentaf87b1c3d4897840d8247589a88d3611106ecedc (diff)
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inets: httpd - Sanity check of content-length header
Gracefully handle invalid content-lenght headers instead of crashing in list_to_integer.
Diffstat (limited to 'lib/inets/src/http_server')
-rw-r--r--lib/inets/src/http_server/httpd_conf.erl20
-rw-r--r--lib/inets/src/http_server/httpd_request.erl102
-rw-r--r--lib/inets/src/http_server/httpd_request_handler.erl27
3 files changed, 90 insertions, 59 deletions
diff --git a/lib/inets/src/http_server/httpd_conf.erl b/lib/inets/src/http_server/httpd_conf.erl
index 27446ca7fe..fa639b0a1c 100644
--- a/lib/inets/src/http_server/httpd_conf.erl
+++ b/lib/inets/src/http_server/httpd_conf.erl
@@ -1,7 +1,7 @@
%%
%% %CopyrightBegin%
%%
-%% Copyright Ericsson AB 1997-2013. All Rights Reserved.
+%% Copyright Ericsson AB 1997-2015. All Rights Reserved.
%%
%% The contents of this file are subject to the Erlang Public License,
%% Version 1.1, (the "License"); you may not use this file except in
@@ -205,13 +205,13 @@ load("MaxURISize " ++ MaxHeaderSize, []) ->
" is an invalid number of MaxHeaderSize")}
end;
-load("MaxBodySize " ++ MaxBodySize, []) ->
- case make_integer(MaxBodySize) of
+load("MaxContentLength " ++ Max, []) ->
+ case make_integer(Max) of
{ok, Integer} ->
- {ok, [], {max_body_size,Integer}};
+ {ok, [], {max_content_length, Integer}};
{error, _} ->
- {error, ?NICE(clean(MaxBodySize) ++
- " is an invalid number of MaxBodySize")}
+ {error, ?NICE(clean(Max) ++
+ " is an invalid number of MaxContentLength")}
end;
load("ServerName " ++ ServerName, []) ->
@@ -569,6 +569,12 @@ validate_config_params([{max_body_size, Value} | Rest])
validate_config_params([{max_body_size, Value} | _]) ->
throw({max_body_size, Value});
+validate_config_params([{max_content_length, Value} | Rest])
+ when is_integer(Value) andalso (Value > 0) ->
+ validate_config_params(Rest);
+validate_config_params([{max_content_length, Value} | _]) ->
+ throw({max_content_length, Value});
+
validate_config_params([{server_name, Value} | Rest])
when is_list(Value) ->
validate_config_params(Rest);
@@ -635,7 +641,7 @@ validate_config_params([{max_keep_alive_request, Value} | Rest])
when is_integer(Value) andalso (Value > 0) ->
validate_config_params(Rest);
validate_config_params([{max_keep_alive_request, Value} | _]) ->
- throw({max_header_size, Value});
+ throw({max_keep_alive_request, Value});
validate_config_params([{keep_alive_timeout, Value} | Rest])
when is_integer(Value) andalso (Value >= 0) ->
diff --git a/lib/inets/src/http_server/httpd_request.erl b/lib/inets/src/http_server/httpd_request.erl
index 712c73599f..6985065c3e 100644
--- a/lib/inets/src/http_server/httpd_request.erl
+++ b/lib/inets/src/http_server/httpd_request.erl
@@ -1,7 +1,7 @@
%%
%% %CopyrightBegin%
%%
-%% Copyright Ericsson AB 2005-2014. All Rights Reserved.
+%% Copyright Ericsson AB 2005-2015. All Rights Reserved.
%%
%% The contents of this file are subject to the Erlang Public License,
%% Version 1.1, (the "License"); you may not use this file except in
@@ -118,18 +118,17 @@ validate(Method, Uri, Version) ->
%% create it.
%% ----------------------------------------------------------------------
update_mod_data(ModData, Method, RequestURI, HTTPVersion, Headers)->
- ParsedHeaders = tagup_header(Headers),
- PersistentConn = get_persistens(HTTPVersion, ParsedHeaders,
+ PersistentConn = get_persistens(HTTPVersion, Headers,
ModData#mod.config_db),
{ok, ModData#mod{data = [],
method = Method,
absolute_uri = format_absolute_uri(RequestURI,
- ParsedHeaders),
+ Headers),
request_uri = format_request_uri(RequestURI),
http_version = HTTPVersion,
request_line = Method ++ " " ++ RequestURI ++
" " ++ HTTPVersion,
- parsed_header = ParsedHeaders,
+ parsed_header = Headers,
connection = PersistentConn}}.
%%%========================================================================
@@ -146,14 +145,14 @@ parse_method(_, _, _, Max, _, _) ->
%% We do not know the version of the client as it comes after the
%% method send the lowest version in the response so that the client
%% will be able to handle it.
- {error, {too_long, Max, 413, "Method unreasonably long"}, lowest_version()}.
+ {error, {size_error, Max, 413, "Method unreasonably long"}, lowest_version()}.
parse_uri(_, _, Current, MaxURI, _, _)
when (Current > MaxURI) andalso (MaxURI =/= nolimit) ->
%% We do not know the version of the client as it comes after the
%% uri send the lowest version in the response so that the client
%% will be able to handle it.
- {error, {too_long, MaxURI, 414, "URI unreasonably long"},lowest_version()};
+ {error, {size_error, MaxURI, 414, "URI unreasonably long"},lowest_version()};
parse_uri(<<>>, URI, Current, Max, MaxSizes, Result) ->
{?MODULE, parse_uri, [URI, Current, Max, MaxSizes, Result]};
parse_uri(<<?SP, Rest/binary>>, URI, _, _, MaxSizes, Result) ->
@@ -179,12 +178,12 @@ parse_version(<<?CR>> = Data, Version, Current, Max, MaxSizes, Result) ->
parse_version(<<Octet, Rest/binary>>, Version, Current, Max, MaxSizes, Result) when Current =< Max ->
parse_version(Rest, [Octet | Version], Current + 1, Max, MaxSizes, Result);
parse_version(_, _, _, Max,_,_) ->
- {error, {too_long, Max, 413, "Version string unreasonably long"}, lowest_version()}.
+ {error, {size_error, Max, 413, "Version string unreasonably long"}, lowest_version()}.
parse_headers(_, _, _, Current, Max, _, Result)
when Max =/= nolimit andalso Current > Max ->
HttpVersion = lists:nth(3, lists:reverse(Result)),
- {error, {too_long, Max, 413, "Headers unreasonably long"}, HttpVersion};
+ {error, {size_error, Max, 413, "Headers unreasonably long"}, HttpVersion};
parse_headers(<<>>, Header, Headers, Current, Max, MaxSizes, Result) ->
{?MODULE, parse_headers, [<<>>, Header, Headers, Current, Max,
@@ -204,14 +203,22 @@ parse_headers(<<?CR,?LF,?CR,?LF,Body/binary>>, [], [], _, _, _, Result) ->
Result])),
{ok, NewResult};
parse_headers(<<?CR,?LF,?CR,?LF,Body/binary>>, Header, Headers, _, _,
- _, Result) ->
- HTTPHeaders = [lists:reverse(Header) | Headers],
- RequestHeaderRcord =
- http_request:headers(HTTPHeaders, #http_request_h{}),
- NewResult =
- list_to_tuple(lists:reverse([Body, {RequestHeaderRcord,
- HTTPHeaders} | Result])),
- {ok, NewResult};
+ MaxSizes, Result) ->
+ case http_request:key_value(lists:reverse(Header)) of
+ undefined -> %% Skip headers with missing :
+ {ok, list_to_tuple(lists:reverse([Body, {http_request:headers(Headers, #http_request_h{}), Headers} | Result]))};
+ NewHeader ->
+ case check_header(NewHeader, MaxSizes) of
+ ok ->
+ {ok, list_to_tuple(lists:reverse([Body, {http_request:headers([NewHeader | Headers],
+ #http_request_h{}),
+ [NewHeader | Headers]} | Result]))};
+
+ {error, Reason} ->
+ HttpVersion = lists:nth(3, lists:reverse(Result)),
+ {error, Reason, HttpVersion}
+ end
+ end;
parse_headers(<<?CR,?LF,?CR>> = Data, Header, Headers, Current, Max,
MaxSizes, Result) ->
@@ -243,8 +250,21 @@ parse_headers(<<?LF, Octet, Rest/binary>>, Header, Headers, Current, Max,
MaxSizes, Result);
parse_headers(<<?CR,?LF, Octet, Rest/binary>>, Header, Headers, _, Max,
MaxSizes, Result) ->
- parse_headers(Rest, [Octet], [lists:reverse(Header) | Headers],
- 0, Max, MaxSizes, Result);
+ case http_request:key_value(lists:reverse(Header)) of
+ undefined -> %% Skip headers with missing :
+ parse_headers(Rest, [Octet], Headers,
+ 0, Max, MaxSizes, Result);
+ NewHeader ->
+ case check_header(NewHeader, MaxSizes) of
+ ok ->
+ parse_headers(Rest, [Octet], [NewHeader | Headers],
+ 0, Max, MaxSizes, Result);
+ {error, Reason} ->
+ HttpVersion = lists:nth(3, lists:reverse(Result)),
+ {error, Reason, HttpVersion}
+ end
+ end;
+
parse_headers(<<?CR>> = Data, Header, Headers, Current, Max,
MaxSizes, Result) ->
{?MODULE, parse_headers, [Data, Header, Headers, Current, Max,
@@ -388,29 +408,25 @@ get_persistens(HTTPVersion,ParsedHeader,ConfigDB)->
false
end.
-
-%%----------------------------------------------------------------------
-%% tagup_header
-%%
-%% Parses the header of a HTTP request and returns a key,value tuple
-%% list containing Name and Value of each header directive as of:
-%%
-%% Content-Type: multipart/mixed -> {"Content-Type", "multipart/mixed"}
-%%
-%% But in http/1.1 the field-names are case insencitive so now it must be
-%% Content-Type: multipart/mixed -> {"content-type", "multipart/mixed"}
-%% The standard furthermore says that leading and traling white space
-%% is not a part of the fieldvalue and shall therefore be removed.
-%%----------------------------------------------------------------------
-tagup_header([]) -> [];
-tagup_header([Line|Rest]) -> [tag(Line, [])|tagup_header(Rest)].
-
-tag([], Tag) ->
- {http_util:to_lower(lists:reverse(Tag)), ""};
-tag([$:|Rest], Tag) ->
- {http_util:to_lower(lists:reverse(Tag)), string:strip(Rest)};
-tag([Chr|Rest], Tag) ->
- tag(Rest, [Chr|Tag]).
-
lowest_version()->
"HTTP/0.9".
+
+check_header({"content-length", Value}, Maxsizes) ->
+ Max = proplists:get_value(max_content_length, Maxsizes),
+ MaxLen = length(integer_to_list(Max)),
+ case length(Value) =< MaxLen of
+ true ->
+ try
+ _ = list_to_integer(Value),
+ ok
+ catch _:_ ->
+ {error, {size_error, Max, 411, "content-length not an integer"}}
+ end;
+ false ->
+ {error, {size_error, Max, 413, "content-length unreasonably long"}}
+ end;
+check_header(_, _) ->
+ ok.
+
+
+
diff --git a/lib/inets/src/http_server/httpd_request_handler.erl b/lib/inets/src/http_server/httpd_request_handler.erl
index 9bea58cc9e..89ccec52cc 100644
--- a/lib/inets/src/http_server/httpd_request_handler.erl
+++ b/lib/inets/src/http_server/httpd_request_handler.erl
@@ -1,7 +1,7 @@
%%
%% %CopyrightBegin%
%%
-%% Copyright Ericsson AB 1997-2014. All Rights Reserved.
+%% Copyright Ericsson AB 1997-2015. All Rights Reserved.
%%
%% The contents of this file are subject to the Erlang Public License,
%% Version 1.1, (the "License"); you may not use this file except in
@@ -119,11 +119,15 @@ continue_init(Manager, ConfigDB, SocketType, Socket, TimeOut) ->
MaxHeaderSize = max_header_size(ConfigDB),
MaxURISize = max_uri_size(ConfigDB),
NrOfRequest = max_keep_alive_request(ConfigDB),
-
+ MaxContentLen = max_content_length(ConfigDB),
+
{_, Status} = httpd_manager:new_connection(Manager),
MFA = {httpd_request, parse, [[{max_uri, MaxURISize}, {max_header, MaxHeaderSize},
- {max_version, ?HTTP_MAX_VERSION_STRING}, {max_method, ?HTTP_MAX_METHOD_STRING}]]},
+ {max_version, ?HTTP_MAX_VERSION_STRING},
+ {max_method, ?HTTP_MAX_METHOD_STRING},
+ {max_content_length, MaxContentLen}
+ ]]},
State = #state{mod = Mod,
manager = Manager,
@@ -207,7 +211,7 @@ handle_info({Proto, Socket, Data},
set_new_data_size(cancel_request_timeout(State), NewDataSize)
end,
handle_http_msg(Result, NewState);
- {error, {too_long, MaxSize, ErrCode, ErrStr}, Version} ->
+ {error, {size_error, MaxSize, ErrCode, ErrStr}, Version} ->
NewModData = ModData#mod{http_version = Version},
httpd_response:send_status(NewModData, ErrCode, ErrStr),
Reason = io_lib:format("~p: ~p max size is ~p~n",
@@ -444,8 +448,7 @@ handle_body(#state{headers = Headers, body = Body, mod = ModData} = State,
error_log(Reason, ModData),
{stop, normal, State#state{response_sent = true}};
_ ->
- Length =
- list_to_integer(Headers#http_request_h.'content-length'),
+ Length = list_to_integer(Headers#http_request_h.'content-length'),
case ((Length =< MaxBodySize) or (MaxBodySize == nolimit)) of
true ->
case httpd_request:whole_body(Body, Length) of
@@ -454,7 +457,7 @@ handle_body(#state{headers = Headers, body = Body, mod = ModData} = State,
ModData#mod.socket,
[{active, once}]),
{noreply, State#state{mfa =
- {Module, Function, Args}}};
+ {Module, Function, Args}}};
{ok, NewBody} ->
handle_response(
@@ -471,7 +474,7 @@ handle_body(#state{headers = Headers, body = Body, mod = ModData} = State,
handle_expect(#state{headers = Headers, mod =
#mod{config_db = ConfigDB} = ModData} = State,
MaxBodySize) ->
- Length = Headers#http_request_h.'content-length',
+ Length = list_to_integer(Headers#http_request_h.'content-length'),
case expect(Headers, ModData#mod.http_version, ConfigDB) of
continue when (MaxBodySize > Length) orelse (MaxBodySize =:= nolimit) ->
httpd_response:send_status(ModData, 100, ""),
@@ -545,9 +548,13 @@ handle_next_request(#state{mod = #mod{connection = true} = ModData,
init_data = ModData#mod.init_data},
MaxHeaderSize = max_header_size(ModData#mod.config_db),
MaxURISize = max_uri_size(ModData#mod.config_db),
+ MaxContentLen = max_content_length(ModData#mod.config_db),
MFA = {httpd_request, parse, [[{max_uri, MaxURISize}, {max_header, MaxHeaderSize},
- {max_version, ?HTTP_MAX_VERSION_STRING}, {max_method, ?HTTP_MAX_METHOD_STRING}]]},
+ {max_version, ?HTTP_MAX_VERSION_STRING},
+ {max_method, ?HTTP_MAX_METHOD_STRING},
+ {max_content_length, MaxContentLen}
+ ]]},
TmpState = State#state{mod = NewModData,
mfa = MFA,
max_keep_alive_request = decrease(Max),
@@ -630,3 +637,5 @@ max_body_size(ConfigDB) ->
max_keep_alive_request(ConfigDB) ->
httpd_util:lookup(ConfigDB, max_keep_alive_request, infinity).
+max_content_length(ConfigDB) ->
+ httpd_util:lookup(ConfigDB, max_content_length, ?HTTP_MAX_CONTENT_LENGTH).