Chapril/xmpp.chapril.org-ejabberd
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Fix cyrsasl_digest RFC-2831 2.1.2.1 (EJAB-476)

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Fix sasl digest bug when username|password|resource strings had
all characters <= U+00FF and at least one character >= U+0080.

Warnning:
Note that by fixing the bug, we may be broking compatibility with clients
that "implements" it.
See comments on https://support.process-one.net/browse/EJAB-476
This commit is contained in:
Pablo Polvorin 2010-12-01 15:54:58 -03:00
parent f0a848ef45
commit c890b17834
1 changed files with 83 additions and 2 deletions
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85
src/cyrsasl_digest.erl
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@ -191,14 +191,20 @@ response(KeyVals, User, Passwd, Nonce, AuthzId, A2Prefix) ->
DigestURI = xml:get_attr_s("digest-uri", KeyVals),
NC = xml:get_attr_s("nc", KeyVals),
QOP = xml:get_attr_s("qop", KeyVals),
%% handle non-fully latin-1 strings as specified
%% on RFC 2831 Section 2.1.2.1 (EJAB-476)
SUser = sanitize(User),
SPasswd = sanitize(Passwd),
SRealm = sanitize(Realm),
A1 = case AuthzId of
"" ->
binary_to_list(
crypto:md5(User ++ ":" ++ Realm ++ ":" ++ Passwd)) ++
crypto:md5(SUser ++ ":" ++ SRealm ++ ":" ++ SPasswd)) ++
":" ++ Nonce ++ ":" ++ CNonce;
_ ->
binary_to_list(
crypto:md5(User ++ ":" ++ Realm ++ ":" ++ Passwd)) ++
crypto:md5(SUser ++ ":" ++ SRealm ++ ":" ++ SPasswd)) ++
":" ++ Nonce ++ ":" ++ CNonce ++ ":" ++ AuthzId
end,
A2 = case QOP of
@ -214,4 +220,79 @@ response(KeyVals, User, Passwd, Nonce, AuthzId, A2Prefix) ->
hex(binary_to_list(crypto:md5(T))).
sanitize(V) ->
L = from_utf8(V),
case lists:all(fun is_latin1/1, L) of
true -> L;
false -> V
end.
%%%% copied from xmerl_ucs:from_utf8/1 and xmerl_ucs:is_latin1/1 , to not
%%%% require xmerl as a dependency only for this.
from_utf8(Bin) when is_binary(Bin) -> from_utf8(binary_to_list(Bin));
from_utf8(List) ->
case expand_utf8(List) of
{Result,0} -> Result;
{_Res,_NumBadChar} ->
exit({ucs,{bad_utf8_character_code}})
end.
%% expand_utf8([Byte]) -> {[UnicodeChar],NumberOfBadBytes}
%% Expand UTF8 byte sequences to ISO 10646/Unicode
%% charactes. Any illegal bytes are removed and the number of
%% bad bytes are returned.
%%
%% Reference:
%% RFC 3629: "UTF-8, a transformation format of ISO 10646".
expand_utf8(Str) ->
expand_utf8_1(Str, [], 0).
expand_utf8_1([C|Cs], Acc, Bad) when C < 16#80 ->
%% Plain Ascii character.
expand_utf8_1(Cs, [C|Acc], Bad);
expand_utf8_1([C1,C2|Cs], Acc, Bad) when C1 band 16#E0 =:= 16#C0,
C2 band 16#C0 =:= 16#80 ->
case ((C1 band 16#1F) bsl 6) bor (C2 band 16#3F) of
C when 16#80 =< C ->
expand_utf8_1(Cs, [C|Acc], Bad);
_ ->
%% Bad range.
expand_utf8_1(Cs, Acc, Bad+1)
end;
expand_utf8_1([C1,C2,C3|Cs], Acc, Bad) when C1 band 16#F0 =:= 16#E0,
C2 band 16#C0 =:= 16#80,
C3 band 16#C0 =:= 16#80 ->
case ((((C1 band 16#0F) bsl 6) bor (C2 band 16#3F)) bsl 6) bor
(C3 band 16#3F) of
C when 16#800 =< C ->
expand_utf8_1(Cs, [C|Acc], Bad);
_ ->
%% Bad range.
expand_utf8_1(Cs, Acc, Bad+1)
end;
expand_utf8_1([C1,C2,C3,C4|Cs], Acc, Bad) when C1 band 16#F8 =:= 16#F0,
C2 band 16#C0 =:= 16#80,
C3 band 16#C0 =:= 16#80,
C4 band 16#C0 =:= 16#80 ->
case ((((((C1 band 16#0F) bsl 6) bor (C2 band 16#3F)) bsl 6) bor
(C3 band 16#3F)) bsl 6) bor (C4 band 16#3F) of
C when 16#10000 =< C ->
expand_utf8_1(Cs, [C|Acc], Bad);
_ ->
%% Bad range.
expand_utf8_1(Cs, Acc, Bad+1)
end;
expand_utf8_1([_|Cs], Acc, Bad) ->
%% Ignore bad character.
expand_utf8_1(Cs, Acc, Bad+1);
expand_utf8_1([], Acc, Bad) -> {lists:reverse(Acc),Bad}.
%%% Test for legitimate Latin-1 code
is_latin1(Ch) when is_integer(Ch), Ch >= 0, Ch =< 255 -> true;
is_latin1(_) -> false.