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authorIngela Anderton Andin <[email protected]>2015-11-04 15:14:21 +0100
committerIngela Anderton Andin <[email protected]>2015-11-11 14:43:27 +0100
commit77acb473d8f056f6f534395f131c6e45693797f0 (patch)
tree7f82d72bb7610bf40e702838c75bcec02afcf684 /lib
parentfe1df7fc6bf050cb6c9bbd99eb9393c426b62f67 (diff)
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inets: Terminate gracfully when an invalid chunked length header is encountered
Also use integer_to_list/2 and list_to_integer/2 instead of reimplementing it.
Diffstat (limited to 'lib')
-rw-r--r--lib/inets/src/http_lib/http_chunk.erl8
-rw-r--r--lib/inets/src/http_lib/http_util.erl69
-rw-r--r--lib/inets/src/http_server/httpd_request_handler.erl10
3 files changed, 18 insertions, 69 deletions
diff --git a/lib/inets/src/http_lib/http_chunk.erl b/lib/inets/src/http_lib/http_chunk.erl
index 9476ea9f5f..c17ff6cce5 100644
--- a/lib/inets/src/http_lib/http_chunk.erl
+++ b/lib/inets/src/http_lib/http_chunk.erl
@@ -143,20 +143,22 @@ decode_size(Data = <<?CR, ?LF, ChunkRest/binary>>, HexList,
{MaxBodySize, Body,
AccLength,
MaxHeaderSize}) ->
- ChunkSize = http_util:hexlist_to_integer(lists:reverse(HexList)),
- case ChunkSize of
+ try http_util:hexlist_to_integer(lists:reverse(HexList)) of
0 -> % Last chunk, there was no data
ignore_extensions(Data, {?MODULE, decode_trailer,
[<<>>, [],[], MaxHeaderSize,
Body,
integer_to_list(AccLength)]});
- _ ->
+ ChunkSize ->
%% Note decode_data may call decode_size again if there
%% is more than one chunk, hence here is where the last parameter
%% to this function comes in.
decode_data(ChunkSize, ChunkRest, {MaxBodySize, Body,
ChunkSize + AccLength ,
MaxHeaderSize})
+ catch
+ _:_ ->
+ throw({error, {chunk_size, HexList}})
end;
decode_size(<<";", Rest/binary>>, HexList, Info) ->
%% Note ignore_extensions will call decode_size/1 again when
diff --git a/lib/inets/src/http_lib/http_util.erl b/lib/inets/src/http_lib/http_util.erl
index 0d07231302..aafa97afee 100644
--- a/lib/inets/src/http_lib/http_util.erl
+++ b/lib/inets/src/http_lib/http_util.erl
@@ -152,27 +152,11 @@ convert_netscapecookie_date([_D,_A,_Y, _SP,
Sec=list_to_integer([S1,S2]),
{{Year,Month,Day},{Hour,Min,Sec}}.
-hexlist_to_integer([]) ->
- empty;
-%%When the string only contains one value its eaasy done.
-%% 0-9
-hexlist_to_integer([Size]) when (Size >= 48) andalso (Size =< 57) ->
- Size - 48;
-%% A-F
-hexlist_to_integer([Size]) when (Size >= 65) andalso (Size =< 70) ->
- Size - 55;
-%% a-f
-hexlist_to_integer([Size]) when (Size >= 97) andalso (Size =< 102) ->
- Size - 87;
-hexlist_to_integer([_Size]) ->
- not_a_num;
+hexlist_to_integer(List) ->
+ list_to_integer(List, 16).
-hexlist_to_integer(Size) ->
- Len = string:span(Size, "1234567890abcdefABCDEF"),
- hexlist_to_integer2(Size, 16 bsl (4 *(Len-2)),0).
-
-integer_to_hexlist(Num)->
- integer_to_hexlist(Num, get_size(Num), []).
+integer_to_hexlist(Int) ->
+ integer_to_list(Int, 16).
convert_month("Jan") -> 1;
convert_month("Feb") -> 2;
@@ -213,51 +197,6 @@ html_encode(Chars) ->
%%%========================================================================
%%% Internal functions
%%%========================================================================
-hexlist_to_integer2([],_Pos,Sum)->
- Sum;
-hexlist_to_integer2([HexVal | HexString], Pos, Sum)
- when HexVal >= 48, HexVal =< 57 ->
- hexlist_to_integer2(HexString, Pos bsr 4, Sum + ((HexVal-48) * Pos));
-
-hexlist_to_integer2([HexVal | HexString], Pos, Sum)
- when HexVal >= 65, HexVal =<70 ->
- hexlist_to_integer2(HexString, Pos bsr 4, Sum + ((HexVal-55) * Pos));
-
-hexlist_to_integer2([HexVal | HexString], Pos, Sum)
- when HexVal>=97, HexVal=<102 ->
- hexlist_to_integer2(HexString, Pos bsr 4, Sum + ((HexVal-87) * Pos));
-
-hexlist_to_integer2(_AfterHexString, _Pos, Sum)->
- Sum.
-
-integer_to_hexlist(Num, Pot, Res) when Pot < 0 ->
- convert_to_ascii([Num | Res]);
-
-integer_to_hexlist(Num,Pot,Res) ->
- Position = (16 bsl (Pot*4)),
- PosVal = Num div Position,
- integer_to_hexlist(Num - (PosVal*Position), Pot-1, [PosVal | Res]).
-
-get_size(Num)->
- get_size(Num, 0).
-
-get_size(Num, Pot) when Num < (16 bsl(Pot *4)) ->
- Pot-1;
-
-get_size(Num, Pot) ->
- get_size(Num, Pot+1).
-
-convert_to_ascii(RevesedNum) ->
- convert_to_ascii(RevesedNum, []).
-
-convert_to_ascii([], Num)->
- Num;
-convert_to_ascii([Num | Reversed], Number)
- when (Num > -1) andalso (Num < 10) ->
- convert_to_ascii(Reversed, [Num + 48 | Number]);
-convert_to_ascii([Num | Reversed], Number)
- when (Num > 9) andalso (Num < 16) ->
- convert_to_ascii(Reversed, [Num + 55 | Number]).
char_to_html_entity(Char, Reserved) ->
case sets:is_element(Char, Reserved) of
diff --git a/lib/inets/src/http_server/httpd_request_handler.erl b/lib/inets/src/http_server/httpd_request_handler.erl
index e5d006c1fd..143d599edb 100644
--- a/lib/inets/src/http_server/httpd_request_handler.erl
+++ b/lib/inets/src/http_server/httpd_request_handler.erl
@@ -443,7 +443,7 @@ handle_body(#state{headers = Headers, body = Body, mod = ModData} = State,
MaxHeaderSize, MaxBodySize) ->
case Headers#http_request_h.'transfer-encoding' of
"chunked" ->
- case http_chunk:decode(Body, MaxBodySize, MaxHeaderSize) of
+ try http_chunk:decode(Body, MaxBodySize, MaxHeaderSize) of
{Module, Function, Args} ->
http_transport:setopts(ModData#mod.socket_type,
ModData#mod.socket,
@@ -455,6 +455,14 @@ handle_body(#state{headers = Headers, body = Body, mod = ModData} = State,
http_chunk:handle_headers(Headers, ChunkedHeaders),
handle_response(State#state{headers = NewHeaders,
body = NewBody})
+ catch
+ throw:Error ->
+ httpd_response:send_status(ModData, 400,
+ "Bad input"),
+ Reason = io_lib:format("Chunk decoding failed: ~p~n",
+ [Error]),
+ error_log(Reason, ModData),
+ {stop, normal, State#state{response_sent = true}}
end;
Encoding when is_list(Encoding) ->
httpd_response:send_status(ModData, 501,