[erlang-bugs] SSL sslv3 not working as expected?
Ingela Anderton Andin
Ingela.Anderton.Andin@REDACTED
Fri Feb 14 17:29:42 CET 2014
Hi again!
On 02/13/2014 12:41 PM, Anthony Ramine wrote:
> Shouldn’t the function be rewritten to be more explicit about the fact that it is just a check? That code is quite hard to follow.
Comming back to this, the code was a little to smart for its own good so
to speak ;) And I actually fooled myself due to how the bug manifested
it self. Fortunately I have quite a few test cases now that prevented me
from merging my suggested patch. Here is a better and hopefully clear
patch :)
Regards Ingela Erlang/OTP team Ericsson AB
diff --git a/lib/ssl/src/ssl.erl b/lib/ssl/src/ssl.erl
index 7edc655..c3bdeb1 100644
--- a/lib/ssl/src/ssl.erl
+++ b/lib/ssl/src/ssl.erl
@@ -626,7 +626,7 @@ handle_options(Opts0, _Role) ->
user_lookup_fun = handle_option(user_lookup_fun, Opts, undefined),
psk_identity = handle_option(psk_identity, Opts, undefined),
srp_identity = handle_option(srp_identity, Opts, undefined),
- ciphers = handle_option(ciphers, Opts, []),
+ ciphers = handle_cipher_option(proplists:get_value(ciphers,
Opts, []), hd(Versions)),
%% Server side option
reuse_session = handle_option(reuse_session, Opts, ReuseSessionFun),
reuse_sessions = handle_option(reuse_sessions, Opts, true),
@@ -769,15 +769,6 @@ validate_option(srp_identity, {Username, Password})
{unicode:characters_to_binary(Username),
unicode:characters_to_binary(Password)};
-validate_option(ciphers, Value) when is_list(Value) ->
- Version = tls_record:highest_protocol_version([]),
- try cipher_suites(Version, Value)
- catch
- exit:_ ->
- throw({error, {options, {ciphers, Value}}});
- error:_->
- throw({error, {options, {ciphers, Value}}})
- end;
validate_option(reuse_session, Value) when is_function(Value) ->
Value;
validate_option(reuse_sessions, Value) when is_boolean(Value) ->
@@ -937,16 +928,26 @@ emulated_options([Opt|Opts], Inet, Emulated) ->
emulated_options([], Inet,Emulated) ->
{Inet, Emulated}.
-cipher_suites(Version, []) ->
+handle_cipher_option(Value, Version) when is_list(Value) ->
+ try binary_cipher_suites(Version, Value) of
+ Suites ->
+ Suites
+ catch
+ exit:_ ->
+ throw({error, {options, {ciphers, Value}}});
+ error:_->
+ throw({error, {options, {ciphers, Value}}})
+ end.
+binary_cipher_suites(Version, []) -> %% Defaults to all supported suits
ssl_cipher:suites(Version);
-cipher_suites(Version, [{_,_,_,_}| _] = Ciphers0) -> %% Backwards
compatibility
+binary_cipher_suites(Version, [{_,_,_,_}| _] = Ciphers0) -> %%
Backwards compatibility
Ciphers = [{KeyExchange, Cipher, Hash} || {KeyExchange, Cipher,
Hash, _} <- Ciphers0],
- cipher_suites(Version, Ciphers);
-cipher_suites(Version, [{_,_,_}| _] = Ciphers0) ->
+ binary_cipher_suites(Version, Ciphers);
+binary_cipher_suites(Version, [{_,_,_}| _] = Ciphers0) ->
Ciphers = [ssl_cipher:suite(C) || C <- Ciphers0],
- cipher_suites(Version, Ciphers);
+ binary_cipher_suites(Version, Ciphers);
-cipher_suites(Version, [Cipher0 | _] = Ciphers0) when is_binary(Cipher0) ->
+binary_cipher_suites(Version, [Cipher0 | _] = Ciphers0) when
is_binary(Cipher0) ->
Supported0 = ssl_cipher:suites(Version)
++ ssl_cipher:anonymous_suites()
++ ssl_cipher:psk_suites(Version)
@@ -954,18 +955,18 @@ cipher_suites(Version, [Cipher0 | _] = Ciphers0)
when is_binary(Cipher0) ->
Supported = ssl_cipher:filter_suites(Supported0),
case [Cipher || Cipher <- Ciphers0, lists:member(Cipher,
Supported)] of
[] ->
- Supported;
+ Supported; %% Defaults to all supported suits
Ciphers ->
Ciphers
end;
-cipher_suites(Version, [Head | _] = Ciphers0) when is_list(Head) ->
+binary_cipher_suites(Version, [Head | _] = Ciphers0) when is_list(Head) ->
%% Format: ["RC4-SHA","RC4-MD5"]
Ciphers = [ssl_cipher:openssl_suite(C) || C <- Ciphers0],
- cipher_suites(Version, Ciphers);
-cipher_suites(Version, Ciphers0) ->
+ binary_cipher_suites(Version, Ciphers);
+binary_cipher_suites(Version, Ciphers0) ->
%% Format: "RC4-SHA:RC4-MD5"
Ciphers = [ssl_cipher:openssl_suite(C) || C <-
string:tokens(Ciphers0, ":")],
- cipher_suites(Version, Ciphers).
+ binary_cipher_suites(Version, Ciphers).
unexpected_format(Error) ->
lists:flatten(io_lib:format("Unexpected error: ~p", [Error])).
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