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-rw-r--r--lib/ssl/src/ssl_cipher.erl58
1 files changed, 22 insertions, 36 deletions
diff --git a/lib/ssl/src/ssl_cipher.erl b/lib/ssl/src/ssl_cipher.erl
index 175d589931..72f02a4362 100644
--- a/lib/ssl/src/ssl_cipher.erl
+++ b/lib/ssl/src/ssl_cipher.erl
@@ -29,7 +29,6 @@
-include("ssl_record.hrl").
-include("ssl_cipher.hrl").
-include("ssl_alert.hrl").
--include("ssl_debug.hrl").
-include_lib("public_key/include/public_key.hrl").
-export([security_parameters/2, suite_definition/1,
@@ -75,20 +74,12 @@ cipher(?RC4, CipherState, Mac, Fragment) ->
S -> S
end,
GenStreamCipherList = [Fragment, Mac],
-
- ?DBG_HEX(GenStreamCipherList),
- ?DBG_HEX(State0),
{State1, T} = crypto:rc4_encrypt_with_state(State0, GenStreamCipherList),
- ?DBG_HEX(T),
{T, CipherState#cipher_state{state = State1}};
cipher(?DES, CipherState, Mac, Fragment) ->
block_cipher(fun(Key, IV, T) ->
crypto:des_cbc_encrypt(Key, IV, T)
end, block_size(des_cbc), CipherState, Mac, Fragment);
-%% cipher(?DES40, CipherState, Mac, Fragment) ->
-%% block_cipher(fun(Key, IV, T) ->
-%% crypto:des_cbc_encrypt(Key, IV, T)
-%% end, block_size(des_cbc), CipherState, Mac, Fragment);
cipher(?'3DES', CipherState, Mac, Fragment) ->
block_cipher(fun(<<K1:8/binary, K2:8/binary, K3:8/binary>>, IV, T) ->
crypto:des3_cbc_encrypt(K1, K2, K3, IV, T)
@@ -109,11 +100,7 @@ block_cipher(Fun, BlockSz, #cipher_state{key=Key, iv=IV} = CS0,
TotSz = byte_size(Mac) + erlang:iolist_size(Fragment) + 1,
{PaddingLength, Padding} = get_padding(TotSz, BlockSz),
L = [Fragment, Mac, PaddingLength, Padding],
- ?DBG_HEX(Key),
- ?DBG_HEX(IV),
- ?DBG_HEX(L),
T = Fun(Key, IV, L),
- ?DBG_HEX(T),
NextIV = next_iv(T, IV),
{T, CS0#cipher_state{iv=NextIV}}.
@@ -127,26 +114,29 @@ block_cipher(Fun, BlockSz, #cipher_state{key=Key, iv=IV} = CS0,
decipher(?NULL, _HashSz, CipherState, Fragment, _) ->
{Fragment, <<>>, CipherState};
decipher(?RC4, HashSz, CipherState, Fragment, _) ->
- ?DBG_TERM(CipherState#cipher_state.key),
State0 = case CipherState#cipher_state.state of
undefined -> crypto:rc4_set_key(CipherState#cipher_state.key);
S -> S
end,
- ?DBG_HEX(State0),
- ?DBG_HEX(Fragment),
- {State1, T} = crypto:rc4_encrypt_with_state(State0, Fragment),
- ?DBG_HEX(T),
- GSC = generic_stream_cipher_from_bin(T, HashSz),
- #generic_stream_cipher{content=Content, mac=Mac} = GSC,
- {Content, Mac, CipherState#cipher_state{state=State1}};
+ try crypto:rc4_encrypt_with_state(State0, Fragment) of
+ {State, Text} ->
+ GSC = generic_stream_cipher_from_bin(Text, HashSz),
+ #generic_stream_cipher{content = Content, mac = Mac} = GSC,
+ {Content, Mac, CipherState#cipher_state{state = State}}
+ catch
+ _:_ ->
+ %% This is a DECRYPTION_FAILED but
+ %% "differentiating between bad_record_mac and decryption_failed
+ %% alerts may permit certain attacks against CBC mode as used in
+ %% TLS [CBCATT]. It is preferable to uniformly use the
+ %% bad_record_mac alert to hide the specific type of the error."
+ ?ALERT_REC(?FATAL, ?BAD_RECORD_MAC)
+ end;
+
decipher(?DES, HashSz, CipherState, Fragment, Version) ->
block_decipher(fun(Key, IV, T) ->
crypto:des_cbc_decrypt(Key, IV, T)
end, CipherState, HashSz, Fragment, Version);
-%% decipher(?DES40, HashSz, CipherState, Fragment, Version) ->
-%% block_decipher(fun(Key, IV, T) ->
-%% crypto:des_cbc_decrypt(Key, IV, T)
-%% end, CipherState, HashSz, Fragment, Version);
decipher(?'3DES', HashSz, CipherState, Fragment, Version) ->
block_decipher(fun(<<K1:8/binary, K2:8/binary, K3:8/binary>>, IV, T) ->
crypto:des3_cbc_decrypt(K1, K2, K3, IV, T)
@@ -178,7 +168,12 @@ block_decipher(Fun, #cipher_state{key=Key, iv=IV} = CipherState0,
end
catch
_:_ ->
- ?ALERT_REC(?FATAL, ?DECRYPTION_FAILED)
+ %% This is a DECRYPTION_FAILED but
+ %% "differentiating between bad_record_mac and decryption_failed
+ %% alerts may permit certain attacks against CBC mode as used in
+ %% TLS [CBCATT]. It is preferable to uniformly use the
+ %% bad_record_mac alert to hide the specific type of the error."
+ ?ALERT_REC(?FATAL, ?BAD_RECORD_MAC)
end.
%%--------------------------------------------------------------------
-spec suites(tls_version()) -> [cipher_suite()].
@@ -416,8 +411,6 @@ bulk_cipher_algorithm(null) ->
%% ?IDEA;
bulk_cipher_algorithm(rc4_128) ->
?RC4;
-%% bulk_cipher_algorithm(des40_cbc) ->
-%% ?DES40;
bulk_cipher_algorithm(des_cbc) ->
?DES;
bulk_cipher_algorithm('3des_ede_cbc') ->
@@ -431,7 +424,6 @@ type(Cipher) when Cipher == null;
?STREAM;
type(Cipher) when Cipher == idea_cbc;
- Cipher == des40_cbc;
Cipher == des_cbc;
Cipher == '3des_ede_cbc';
Cipher == aes_128_cbc;
@@ -443,8 +435,6 @@ key_material(null) ->
key_material(Cipher) when Cipher == idea_cbc;
Cipher == rc4_128 ->
16;
-%%key_material(des40_cbc) ->
-%% 5;
key_material(des_cbc) ->
8;
key_material('3des_ede_cbc') ->
@@ -459,8 +449,7 @@ expanded_key_material(null) ->
expanded_key_material(Cipher) when Cipher == idea_cbc;
Cipher == rc4_128 ->
16;
-expanded_key_material(Cipher) when Cipher == des_cbc;
- Cipher == des40_cbc ->
+expanded_key_material(Cipher) when Cipher == des_cbc ->
8;
expanded_key_material('3des_ede_cbc') ->
24;
@@ -471,8 +460,6 @@ expanded_key_material(Cipher) when Cipher == aes_128_cbc;
effective_key_bits(null) ->
0;
-%%effective_key_bits(des40_cbc) ->
-%% 40;
effective_key_bits(des_cbc) ->
56;
effective_key_bits(Cipher) when Cipher == idea_cbc;
@@ -491,7 +478,6 @@ iv_size(Cipher) ->
block_size(Cipher).
block_size(Cipher) when Cipher == idea_cbc;
- Cipher == des40_cbc;
Cipher == des_cbc;
Cipher == '3des_ede_cbc' ->
8;
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-08 18:08:55 +0000