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-rw-r--r--lib/ssh/doc/src/ssh_app.xml8
-rw-r--r--lib/ssh/src/ssh.hrl6
-rw-r--r--lib/ssh/src/ssh_connection_handler.erl15
-rw-r--r--lib/ssh/src/ssh_message.erl8
-rw-r--r--lib/ssh/src/ssh_transport.erl203
-rw-r--r--lib/ssh/test/ssh_bench_SUITE.erl33
6 files changed, 199 insertions, 74 deletions
diff --git a/lib/ssh/doc/src/ssh_app.xml b/lib/ssh/doc/src/ssh_app.xml
index 9ec909d733..e80bb1853d 100644
--- a/lib/ssh/doc/src/ssh_app.xml
+++ b/lib/ssh/doc/src/ssh_app.xml
@@ -151,6 +151,9 @@
<item>diffie-hellman-group16-sha512</item>
<item>diffie-hellman-group18-sha512</item>
<item>diffie-hellman-group14-sha256</item>
+ <item>curve25519-sha256</item>
+ <item>[email protected]</item>
+ <item>curve448-sha512</item>
<item>diffie-hellman-group14-sha1</item>
<item>diffie-hellman-group-exchange-sha1</item>
<item>(diffie-hellman-group1-sha1, retired: It can be enabled with the
@@ -186,6 +189,7 @@
<tag>Encryption algorithms (ciphers)</tag>
<item>
<list type="bulleted">
+ <item>[email protected]</item>
<item>[email protected]</item>
<item>aes256-ctr</item>
<item>aes192-ctr</item>
@@ -365,6 +369,10 @@
</list>
<p/>
</item>
+
+ <item>
+ <url href="https://tools.ietf.org/html/draft-ietf-curdle-ssh-curves">Secure Shell (SSH) Key Exchange Method using Curve25519 and Curve448 (work in progress)</url>
+ </item>
</list>
diff --git a/lib/ssh/src/ssh.hrl b/lib/ssh/src/ssh.hrl
index 01c44cb371..66dbf0b144 100644
--- a/lib/ssh/src/ssh.hrl
+++ b/lib/ssh/src/ssh.hrl
@@ -118,6 +118,9 @@
'diffie-hellman-group14-sha256' |
'diffie-hellman-group16-sha512' |
'diffie-hellman-group18-sha512' |
+ 'curve25519-sha256' |
+ '[email protected]' |
+ 'curve448-sha512' |
'ecdh-sha2-nistp256' |
'ecdh-sha2-nistp384' |
'ecdh-sha2-nistp521'
@@ -140,7 +143,8 @@
'[email protected]' |
'aes192-ctr' |
'aes256-ctr' |
- '[email protected]'
+ '[email protected]' |
+ '[email protected]'
.
-type mac_alg() :: 'AEAD_AES_128_GCM' |
diff --git a/lib/ssh/src/ssh_connection_handler.erl b/lib/ssh/src/ssh_connection_handler.erl
index 8e4831a601..4b41c10cbb 100644
--- a/lib/ssh/src/ssh_connection_handler.erl
+++ b/lib/ssh/src/ssh_connection_handler.erl
@@ -356,6 +356,8 @@ alg(ConnectionHandler) ->
| undefined,
encrypted_data_buffer = <<>> :: binary()
| undefined,
+ aead_data = <<>> :: binary()
+ | undefined,
undecrypted_packet_length :: undefined | non_neg_integer(),
key_exchange_init_msg :: #ssh_msg_kexinit{}
| undefined,
@@ -1308,14 +1310,16 @@ handle_event(info, {Proto, Sock, NewData}, StateName, D0 = #data{socket = Sock,
try ssh_transport:handle_packet_part(
D0#data.decrypted_data_buffer,
<<(D0#data.encrypted_data_buffer)/binary, NewData/binary>>,
- D0#data.undecrypted_packet_length,
+ D0#data.aead_data,
+ D0#data.undecrypted_packet_length,
D0#data.ssh_params)
of
{packet_decrypted, DecryptedBytes, EncryptedDataRest, Ssh1} ->
D1 = D0#data{ssh_params =
Ssh1#ssh{recv_sequence = ssh_transport:next_seqnum(Ssh1#ssh.recv_sequence)},
decrypted_data_buffer = <<>>,
- undecrypted_packet_length = undefined,
+ undecrypted_packet_length = undefined,
+ aead_data = <<>>,
encrypted_data_buffer = EncryptedDataRest},
try
ssh_message:decode(set_kex_overload_prefix(DecryptedBytes,D1))
@@ -1353,14 +1357,15 @@ handle_event(info, {Proto, Sock, NewData}, StateName, D0 = #data{socket = Sock,
StateName, D1),
{stop, Shutdown, D}
end;
-
- {get_more, DecryptedBytes, EncryptedDataRest, RemainingSshPacketLen, Ssh1} ->
+
+ {get_more, DecryptedBytes, EncryptedDataRest, AeadData, RemainingSshPacketLen, Ssh1} ->
%% Here we know that there are not enough bytes in
%% EncryptedDataRest to use. We must wait for more.
inet:setopts(Sock, [{active, once}]),
{keep_state, D0#data{encrypted_data_buffer = EncryptedDataRest,
decrypted_data_buffer = DecryptedBytes,
- undecrypted_packet_length = RemainingSshPacketLen,
+ undecrypted_packet_length = RemainingSshPacketLen,
+ aead_data = AeadData,
ssh_params = Ssh1}};
{bad_mac, Ssh1} ->
diff --git a/lib/ssh/src/ssh_message.erl b/lib/ssh/src/ssh_message.erl
index 55c0548c9b..da4027a763 100644
--- a/lib/ssh/src/ssh_message.erl
+++ b/lib/ssh/src/ssh_message.erl
@@ -289,12 +289,12 @@ encode(#ssh_msg_kex_dh_gex_reply{
<<?Ebyte(?SSH_MSG_KEX_DH_GEX_REPLY), ?Ebinary(EncKey), ?Empint(F), ?Ebinary(EncSign)>>;
encode(#ssh_msg_kex_ecdh_init{q_c = Q_c}) ->
- <<?Ebyte(?SSH_MSG_KEX_ECDH_INIT), ?Empint(Q_c)>>;
+ <<?Ebyte(?SSH_MSG_KEX_ECDH_INIT), ?Ebinary(Q_c)>>;
encode(#ssh_msg_kex_ecdh_reply{public_host_key = {Key,SigAlg}, q_s = Q_s, h_sig = Sign}) ->
EncKey = public_key:ssh_encode(Key, ssh2_pubkey),
EncSign = encode_signature(Key, SigAlg, Sign),
- <<?Ebyte(?SSH_MSG_KEX_ECDH_REPLY), ?Ebinary(EncKey), ?Empint(Q_s), ?Ebinary(EncSign)>>;
+ <<?Ebyte(?SSH_MSG_KEX_ECDH_REPLY), ?Ebinary(EncKey), ?Ebinary(Q_s), ?Ebinary(EncSign)>>;
encode(#ssh_msg_ignore{data = Data}) ->
<<?Ebyte(?SSH_MSG_IGNORE), ?Estring_utf8(Data)>>;
@@ -504,13 +504,13 @@ decode(<<?BYTE(?SSH_MSG_KEX_DH_GEX_REPLY), ?DEC_BIN(Key,__0), ?DEC_MPINT(F,__1),
h_sig = decode_signature(Hashsign)
};
-decode(<<"ecdh",?BYTE(?SSH_MSG_KEX_ECDH_INIT), ?DEC_MPINT(Q_c,__0)>>) ->
+decode(<<"ecdh",?BYTE(?SSH_MSG_KEX_ECDH_INIT), ?DEC_BIN(Q_c,__0)>>) ->
#ssh_msg_kex_ecdh_init{
q_c = Q_c
};
decode(<<"ecdh",?BYTE(?SSH_MSG_KEX_ECDH_REPLY),
- ?DEC_BIN(Key,__1), ?DEC_MPINT(Q_s,__2), ?DEC_BIN(Sig,__3)>>) ->
+ ?DEC_BIN(Key,__1), ?DEC_BIN(Q_s,__2), ?DEC_BIN(Sig,__3)>>) ->
#ssh_msg_kex_ecdh_reply{
public_host_key = public_key:ssh_decode(Key, ssh2_pubkey),
q_s = Q_s,
diff --git a/lib/ssh/src/ssh_transport.erl b/lib/ssh/src/ssh_transport.erl
index b6d7aa0b1b..c5b0704925 100644
--- a/lib/ssh/src/ssh_transport.erl
+++ b/lib/ssh/src/ssh_transport.erl
@@ -36,7 +36,7 @@
default_algorithms/0, default_algorithms/1,
algo_classes/0, algo_class/1,
algo_two_spec_classes/0, algo_two_spec_class/1,
- handle_packet_part/4,
+ handle_packet_part/5,
handle_hello_version/1,
key_exchange_init_msg/1,
key_init/3, new_keys_message/1,
@@ -104,17 +104,14 @@ algo_two_spec_class(_) -> false.
default_algorithms(kex) ->
supported_algorithms(kex, [
- %% Under devolpment:
- 'curve25519-sha256',
- '[email protected]',
- 'curve448-sha512',
%% Gone in OpenSSH 7.3.p1:
'diffie-hellman-group1-sha1'
]);
default_algorithms(cipher) ->
supported_algorithms(cipher, same(['AEAD_AES_128_GCM',
- 'AEAD_AES_256_GCM']));
+ 'AEAD_AES_256_GCM'
+ ]));
default_algorithms(mac) ->
supported_algorithms(mac, same(['AEAD_AES_128_GCM',
'AEAD_AES_256_GCM']));
@@ -131,15 +128,15 @@ supported_algorithms(kex) ->
{'ecdh-sha2-nistp384', [{public_keys,ecdh}, {curves,secp384r1}, {hashs,sha384}]},
{'ecdh-sha2-nistp521', [{public_keys,ecdh}, {curves,secp521r1}, {hashs,sha512}]},
{'ecdh-sha2-nistp256', [{public_keys,ecdh}, {curves,secp256r1}, {hashs,sha256}]},
- %% https://tools.ietf.org/html/draft-ietf-curdle-ssh-curves
- %% Secure Shell (SSH) Key Exchange Method using Curve25519 and Curve448
- {'curve25519-sha256', [{public_keys,eddh}, {curves,x25519}, {hashs,sha256}]},
- {'[email protected]', [{public_keys,eddh}, {curves,x25519}, {hashs,sha256}]},
- {'curve448-sha512', [{public_keys,eddh}, {curves,x448}, {hashs,sha512}]},
{'diffie-hellman-group-exchange-sha256', [{public_keys,dh}, {hashs,sha256}]},
{'diffie-hellman-group16-sha512', [{public_keys,dh}, {hashs,sha512}]}, % In OpenSSH 7.3.p1
{'diffie-hellman-group18-sha512', [{public_keys,dh}, {hashs,sha512}]}, % In OpenSSH 7.3.p1
{'diffie-hellman-group14-sha256', [{public_keys,dh}, {hashs,sha256}]}, % In OpenSSH 7.3.p1
+ %% https://tools.ietf.org/html/draft-ietf-curdle-ssh-curves
+ %% Secure Shell (SSH) Key Exchange Method using Curve25519 and Curve448
+ {'curve25519-sha256', [{public_keys,ecdh}, {curves,x25519}, {hashs,sha256}]},
+ {'[email protected]', [{public_keys,ecdh}, {curves,x25519}, {hashs,sha256}]},
+ {'curve448-sha512', [{public_keys,ecdh}, {curves,x448}, {hashs,sha512}]},
{'diffie-hellman-group14-sha1', [{public_keys,dh}, {hashs,sha}]},
{'diffie-hellman-group-exchange-sha1', [{public_keys,dh}, {hashs,sha}]},
{'diffie-hellman-group1-sha1', [{public_keys,dh}, {hashs,sha}]}
@@ -160,6 +157,7 @@ supported_algorithms(cipher) ->
same(
select_crypto_supported(
[
+ {'[email protected]', [{ciphers,chacha20}, {macs,poly1305}]},
{'[email protected]', [{ciphers,{aes_gcm,256}}]},
{'aes256-ctr', [{ciphers,{aes_ctr,256}}]},
{'aes192-ctr', [{ciphers,{aes_ctr,192}}]},
@@ -982,13 +980,14 @@ select_algorithm(Role, Client, Server, Opts) ->
%%% the exchanged MAC algorithms are ignored and there doesn't have to be
%%% a matching MAC.
-aead_gcm_simultan('[email protected]', _) -> {'AEAD_AES_128_GCM', 'AEAD_AES_128_GCM'};
-aead_gcm_simultan('[email protected]', _) -> {'AEAD_AES_256_GCM', 'AEAD_AES_256_GCM'};
-aead_gcm_simultan('AEAD_AES_128_GCM', _) -> {'AEAD_AES_128_GCM', 'AEAD_AES_128_GCM'};
-aead_gcm_simultan('AEAD_AES_256_GCM', _) -> {'AEAD_AES_256_GCM', 'AEAD_AES_256_GCM'};
-aead_gcm_simultan(_, 'AEAD_AES_128_GCM') -> {'AEAD_AES_128_GCM', 'AEAD_AES_128_GCM'};
-aead_gcm_simultan(_, 'AEAD_AES_256_GCM') -> {'AEAD_AES_256_GCM', 'AEAD_AES_256_GCM'};
-aead_gcm_simultan(Cipher, Mac) -> {Cipher,Mac}.
+aead_gcm_simultan('[email protected]', _) -> {'AEAD_AES_128_GCM', 'AEAD_AES_128_GCM'};
+aead_gcm_simultan('[email protected]', _) -> {'AEAD_AES_256_GCM', 'AEAD_AES_256_GCM'};
+aead_gcm_simultan('AEAD_AES_128_GCM'=C, _) -> {C, C};
+aead_gcm_simultan('AEAD_AES_256_GCM'=C, _) -> {C, C};
+aead_gcm_simultan(_, 'AEAD_AES_128_GCM'=C) -> {C, C};
+aead_gcm_simultan(_, 'AEAD_AES_256_GCM'=C) -> {C, C};
+aead_gcm_simultan('[email protected]'=C, _)-> {C, C};
+aead_gcm_simultan(Cipher, Mac) -> {Cipher,Mac}.
select_encrypt_decrypt(client, Client, Server) ->
@@ -1136,7 +1135,7 @@ pack(PlainText,
encrypt = CryptoAlg} = Ssh0, PacketLenDeviationForTests) when is_binary(PlainText) ->
{Ssh1, CompressedPlainText} = compress(Ssh0, PlainText),
- {EcryptedPacket, MAC, Ssh3} =
+ {FinalPacket, Ssh3} =
case pkt_type(CryptoAlg) of
common ->
PaddingLen = padding_length(4+1+size(CompressedPlainText), Ssh0),
@@ -1145,16 +1144,15 @@ pack(PlainText,
PlainPacketData = <<?UINT32(PlainPacketLen),?BYTE(PaddingLen), CompressedPlainText/binary, Padding/binary>>,
{Ssh2, EcryptedPacket0} = encrypt(Ssh1, PlainPacketData),
MAC0 = mac(MacAlg, MacKey, SeqNum, PlainPacketData),
- {EcryptedPacket0, MAC0, Ssh2};
+ {<<EcryptedPacket0/binary,MAC0/binary>>, Ssh2};
aead ->
PaddingLen = padding_length(1+size(CompressedPlainText), Ssh0),
Padding = ssh_bits:random(PaddingLen),
PlainPacketLen = 1 + PaddingLen + size(CompressedPlainText) + PacketLenDeviationForTests,
PlainPacketData = <<?BYTE(PaddingLen), CompressedPlainText/binary, Padding/binary>>,
- {Ssh2, {EcryptedPacket0,MAC0}} = encrypt(Ssh1, {<<?UINT32(PlainPacketLen)>>,PlainPacketData}),
- {<<?UINT32(PlainPacketLen),EcryptedPacket0/binary>>, MAC0, Ssh2}
+ {Ssh2, {EcryptedPacket0,MAC0}} = encrypt(Ssh1, <<?UINT32(PlainPacketLen),PlainPacketData/binary>>),
+ {<<EcryptedPacket0/binary,MAC0/binary>>, Ssh2}
end,
- FinalPacket = [EcryptedPacket, MAC],
Ssh = Ssh3#ssh{send_sequence = (SeqNum+1) band 16#ffffffff},
{FinalPacket, Ssh}.
@@ -1174,31 +1172,31 @@ padding_length(Size, #ssh{encrypt_block_size = BlockSize,
-handle_packet_part(<<>>, Encrypted0, undefined, #ssh{decrypt = CryptoAlg} = Ssh0) ->
+handle_packet_part(<<>>, Encrypted0, AEAD0, undefined, #ssh{decrypt = CryptoAlg} = Ssh0) ->
%% New ssh packet
case get_length(pkt_type(CryptoAlg), Encrypted0, Ssh0) of
get_more ->
%% too short to get the length
- {get_more, <<>>, Encrypted0, undefined, Ssh0};
+ {get_more, <<>>, Encrypted0, AEAD0, undefined, Ssh0};
- {ok, PacketLen, _, _, _} when PacketLen > ?SSH_MAX_PACKET_SIZE ->
+ {ok, PacketLen, _, _, _, _} when PacketLen > ?SSH_MAX_PACKET_SIZE ->
%% far too long message than expected
{error, {exceeds_max_size,PacketLen}};
- {ok, PacketLen, Decrypted, Encrypted1,
+ {ok, PacketLen, Decrypted, Encrypted1, AEAD,
#ssh{recv_mac_size = MacSize} = Ssh1} ->
%% enough bytes so we got the length and can calculate how many
%% more bytes to expect for a full packet
TotalNeeded = (4 + PacketLen + MacSize),
- handle_packet_part(Decrypted, Encrypted1, TotalNeeded, Ssh1)
+ handle_packet_part(Decrypted, Encrypted1, AEAD, TotalNeeded, Ssh1)
end;
-handle_packet_part(DecryptedPfx, EncryptedBuffer, TotalNeeded, Ssh0)
+handle_packet_part(DecryptedPfx, EncryptedBuffer, AEAD, TotalNeeded, Ssh0)
when (size(DecryptedPfx)+size(EncryptedBuffer)) < TotalNeeded ->
%% need more bytes to finalize the packet
- {get_more, DecryptedPfx, EncryptedBuffer, TotalNeeded, Ssh0};
+ {get_more, DecryptedPfx, EncryptedBuffer, AEAD, TotalNeeded, Ssh0};
-handle_packet_part(DecryptedPfx, EncryptedBuffer, TotalNeeded,
+handle_packet_part(DecryptedPfx, EncryptedBuffer, AEAD, TotalNeeded,
#ssh{recv_mac_size = MacSize,
decrypt = CryptoAlg} = Ssh0) ->
%% enough bytes to decode the packet.
@@ -1216,8 +1214,7 @@ handle_packet_part(DecryptedPfx, EncryptedBuffer, TotalNeeded,
{packet_decrypted, DecompressedPayload, NextPacketBytes, Ssh}
end;
aead ->
- PacketLenBin = DecryptedPfx,
- case decrypt(Ssh0, {PacketLenBin,EncryptedSfx,Mac}) of
+ case decrypt(Ssh0, {AEAD,EncryptedSfx,Mac}) of
{Ssh1, error} ->
{bad_mac, Ssh1};
{Ssh1, DecryptedSfx} ->
@@ -1234,21 +1231,29 @@ get_length(common, EncryptedBuffer, #ssh{decrypt_block_size = BlockSize} = Ssh0)
<<EncBlock:BlockSize/binary, EncryptedRest/binary>> = EncryptedBuffer,
{Ssh,
<<?UINT32(PacketLen),_/binary>> = Decrypted} = decrypt(Ssh0, EncBlock),
- {ok, PacketLen, Decrypted, EncryptedRest, Ssh};
+ {ok, PacketLen, Decrypted, EncryptedRest, <<>>, Ssh};
false ->
get_more
end;
+
get_length(aead, EncryptedBuffer, Ssh) ->
- case size(EncryptedBuffer) >= 4 of
- true ->
+ case {size(EncryptedBuffer) >= 4, Ssh#ssh.decrypt} of
+ {true, '[email protected]'} ->
+ <<EncryptedLen:4/binary, EncryptedRest/binary>> = EncryptedBuffer,
+ {Ssh1, PacketLenBin} = decrypt(Ssh, {length,EncryptedLen}),
+ <<?UINT32(PacketLen)>> = PacketLenBin,
+ {ok, PacketLen, PacketLenBin, EncryptedRest, EncryptedLen, Ssh1};
+ {true, _} ->
<<?UINT32(PacketLen), EncryptedRest/binary>> = EncryptedBuffer,
- {ok, PacketLen, <<?UINT32(PacketLen)>>, EncryptedRest, Ssh};
- false ->
+ {ok, PacketLen, <<?UINT32(PacketLen)>>, EncryptedRest, <<?UINT32(PacketLen)>>, Ssh};
+ {false, _} ->
get_more
end.
+
pkt_type('AEAD_AES_128_GCM') -> aead;
pkt_type('AEAD_AES_256_GCM') -> aead;
+pkt_type('[email protected]') -> aead;
pkt_type(_) -> common.
payload(<<PacketLen:32, PaddingLen:8, PayloadAndPadding/binary>>) ->
@@ -1353,11 +1358,32 @@ cipher('aes192-ctr') ->
cipher('aes256-ctr') ->
#cipher_data{key_bytes = 32,
iv_bytes = 16,
- block_bytes = 16}.
+ block_bytes = 16};
+
+cipher('[email protected]') -> % FIXME: Verify!!
+ #cipher_data{key_bytes = 32,
+ iv_bytes = 12,
+ block_bytes = 8}.
+
encrypt_init(#ssh{encrypt = none} = Ssh) ->
{ok, Ssh};
+encrypt_init(#ssh{encrypt = '[email protected]', role = client} = Ssh) ->
+ %% [email protected] uses two independent crypto streams, one (chacha20)
+ %% for the length used in stream mode, and the other (chacha20-poly1305) as AEAD for
+ %% the payload and to MAC the length||payload.
+ %% See draft-josefsson-ssh-chacha20-poly1305-openssh-00
+ <<K2:32/binary,K1:32/binary>> = hash(Ssh, "C", 512),
+ {ok, Ssh#ssh{encrypt_keys = {K1,K2}
+ % encrypt_block_size = 16, %default = 8. What to set it to? 64 (openssl chacha.h)
+ % ctx and iv is setup for each packet
+ }};
+encrypt_init(#ssh{encrypt = '[email protected]', role = server} = Ssh) ->
+ <<K2:32/binary,K1:32/binary>> = hash(Ssh, "D", 512),
+ {ok, Ssh#ssh{encrypt_keys = {K1,K2}
+ % encrypt_block_size = 16, %default = 8. What to set it to?
+ }};
encrypt_init(#ssh{encrypt = 'AEAD_AES_128_GCM', role = client} = Ssh) ->
IV = hash(Ssh, "A", 12*8),
<<K:16/binary>> = hash(Ssh, "C", 128),
@@ -1458,18 +1484,40 @@ encrypt_final(Ssh) ->
encrypt(#ssh{encrypt = none} = Ssh, Data) ->
{Ssh, Data};
+encrypt(#ssh{encrypt = '[email protected]',
+ encrypt_keys = {K1,K2},
+ send_sequence = Seq} = Ssh,
+ <<LenData:4/binary, PayloadData/binary>>) ->
+ %% Encrypt length
+ IV1 = <<0:8/unit:8, Seq:8/unit:8>>,
+ {_,EncLen} = crypto:stream_encrypt(crypto:stream_init(chacha20, K1, IV1),
+ LenData),
+ %% Encrypt payload
+ IV2 = <<1:8/little-unit:8, Seq:8/unit:8>>,
+ {_,EncPayloadData} = crypto:stream_encrypt(crypto:stream_init(chacha20, K2, IV2),
+ PayloadData),
+
+ %% MAC tag
+ {_,PolyKey} = crypto:stream_encrypt(crypto:stream_init(chacha20, K2, <<0:8/unit:8,Seq:8/unit:8>>),
+ <<0:32/unit:8>>),
+ EncBytes = <<EncLen/binary,EncPayloadData/binary>>,
+ Ctag = crypto:poly1305(PolyKey, EncBytes),
+ %% Result
+ {Ssh, {EncBytes,Ctag}};
encrypt(#ssh{encrypt = 'AEAD_AES_128_GCM',
encrypt_keys = K,
- encrypt_ctx = IV0} = Ssh, Data={_AAD,_Ptext}) ->
- Enc = {_Ctext,_Ctag} = crypto:block_encrypt(aes_gcm, K, IV0, Data),
+ encrypt_ctx = IV0} = Ssh,
+ <<LenData:4/binary, PayloadData/binary>>) ->
+ {Ctext,Ctag} = crypto:block_encrypt(aes_gcm, K, IV0, {LenData,PayloadData}),
IV = next_gcm_iv(IV0),
- {Ssh#ssh{encrypt_ctx = IV}, Enc};
+ {Ssh#ssh{encrypt_ctx = IV}, {<<LenData/binary,Ctext/binary>>,Ctag}};
encrypt(#ssh{encrypt = 'AEAD_AES_256_GCM',
encrypt_keys = K,
- encrypt_ctx = IV0} = Ssh, Data={_AAD,_Ptext}) ->
- Enc = {_Ctext,_Ctag} = crypto:block_encrypt(aes_gcm, K, IV0, Data),
+ encrypt_ctx = IV0} = Ssh,
+ <<LenData:4/binary, PayloadData/binary>>) ->
+ {Ctext,Ctag} = crypto:block_encrypt(aes_gcm, K, IV0, {LenData,PayloadData}),
IV = next_gcm_iv(IV0),
- {Ssh#ssh{encrypt_ctx = IV}, Enc};
+ {Ssh#ssh{encrypt_ctx = IV}, {<<LenData/binary,Ctext/binary>>,Ctag}};
encrypt(#ssh{encrypt = '3des-cbc',
encrypt_keys = {K1,K2,K3},
encrypt_ctx = IV0} = Ssh, Data) ->
@@ -1502,6 +1550,14 @@ encrypt(#ssh{encrypt = 'aes256-ctr',
decrypt_init(#ssh{decrypt = none} = Ssh) ->
{ok, Ssh};
+decrypt_init(#ssh{decrypt = '[email protected]', role = client} = Ssh) ->
+ <<K2:32/binary,K1:32/binary>> = hash(Ssh, "D", 512),
+ {ok, Ssh#ssh{decrypt_keys = {K1,K2}
+ }};
+decrypt_init(#ssh{decrypt = '[email protected]', role = server} = Ssh) ->
+ <<K2:32/binary,K1:32/binary>> = hash(Ssh, "C", 512),
+ {ok, Ssh#ssh{decrypt_keys = {K1,K2}
+ }};
decrypt_init(#ssh{decrypt = 'AEAD_AES_128_GCM', role = client} = Ssh) ->
IV = hash(Ssh, "B", 12*8),
<<K:16/binary>> = hash(Ssh, "D", 128),
@@ -1602,6 +1658,31 @@ decrypt_final(Ssh) ->
decrypt(Ssh, <<>>) ->
{Ssh, <<>>};
+decrypt(#ssh{decrypt = '[email protected]',
+ decrypt_keys = {K1,_K2},
+ recv_sequence = Seq} = Ssh, {length,EncryptedLen}) ->
+ {_State,PacketLenBin} =
+ crypto:stream_decrypt(crypto:stream_init(chacha20, K1, <<0:8/unit:8, Seq:8/unit:8>>),
+ EncryptedLen),
+ {Ssh, PacketLenBin};
+decrypt(#ssh{decrypt = '[email protected]',
+ decrypt_keys = {_K1,K2},
+ recv_sequence = Seq} = Ssh, {AAD,Ctext,Ctag}) ->
+ %% The length is already decoded and used to divide the input
+ %% Check the mac (important that it is timing-safe):
+ {_,PolyKey} =
+ crypto:stream_encrypt(crypto:stream_init(chacha20, K2, <<0:8/unit:8,Seq:8/unit:8>>),
+ <<0:32/unit:8>>),
+ case equal_const_time(Ctag, crypto:poly1305(PolyKey, <<AAD/binary,Ctext/binary>>)) of
+ true ->
+ %% MAC is ok, decode
+ IV2 = <<1:8/little-unit:8, Seq:8/unit:8>>,
+ {_,PlainText} =
+ crypto:stream_decrypt(crypto:stream_init(chacha20,K2,IV2), Ctext),
+ {Ssh, PlainText};
+ false ->
+ {Ssh,error}
+ end;
decrypt(#ssh{decrypt = none} = Ssh, Data) ->
{Ssh, Data};
decrypt(#ssh{decrypt = 'AEAD_AES_128_GCM',
@@ -1744,7 +1825,7 @@ send_mac_init(SSH) ->
Key = hash(SSH, "F", KeySize),
{ok, SSH#ssh { send_mac_key = Key }}
end;
- aead ->
+ _ ->
%% Not applicable
{ok, SSH}
end.
@@ -1765,7 +1846,7 @@ recv_mac_init(SSH) ->
Key = hash(SSH, "E", 8*mac_key_bytes(SSH#ssh.recv_mac)),
{ok, SSH#ssh { recv_mac_key = Key }}
end;
- aead ->
+ _ ->
%% Not applicable
{ok, SSH}
end.
@@ -1812,6 +1893,7 @@ hash(K, H, Ki, N, HashAlg) ->
kex_hash(SSH, Key, HashAlg, Args) ->
crypto:hash(HashAlg, kex_plaintext(SSH,Key,Args)).
+
kex_plaintext(SSH, Key, Args) ->
EncodedKey = public_key:ssh_encode(Key, ssh2_pubkey),
<<?Estring(SSH#ssh.c_version), ?Estring(SSH#ssh.s_version),
@@ -1819,8 +1901,13 @@ kex_plaintext(SSH, Key, Args) ->
?Ebinary(EncodedKey),
(kex_alg_dependent(Args))/binary>>.
+
+kex_alg_dependent({Q_c, Q_s, K}) when is_binary(Q_c), is_binary(Q_s) ->
+ %% ecdh
+ <<?Ebinary(Q_c), ?Ebinary(Q_s), ?Empint(K)>>;
+
kex_alg_dependent({E, F, K}) ->
- %% diffie-hellman and ec diffie-hellman (with E = Q_c, F = Q_s)
+ %% diffie-hellman
<<?Empint(E), ?Empint(F), ?Empint(K)>>;
kex_alg_dependent({-1, NBits, -1, Prime, Gen, E, F, K}) ->
@@ -1905,6 +1992,7 @@ mac_key_bytes('hmac-sha2-256')-> 32;
mac_key_bytes('hmac-sha2-512')-> 64;
mac_key_bytes('AEAD_AES_128_GCM') -> 0;
mac_key_bytes('AEAD_AES_256_GCM') -> 0;
+mac_key_bytes('[email protected]') -> 0;
mac_key_bytes(none) -> 0.
mac_digest_size('hmac-sha1') -> 20;
@@ -1915,6 +2003,7 @@ mac_digest_size('hmac-sha2-256') -> 32;
mac_digest_size('hmac-sha2-512') -> 64;
mac_digest_size('AEAD_AES_128_GCM') -> 16;
mac_digest_size('AEAD_AES_256_GCM') -> 16;
+mac_digest_size('[email protected]') -> 16;
mac_digest_size(none) -> 0.
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
@@ -1937,11 +2026,13 @@ parallell_gen_key(Ssh = #ssh{keyex_key = {x, {G, P}},
Ssh#ssh{keyex_key = {{Private, Public}, {G, P}}}.
+generate_key(ecdh = Algorithm, Args) ->
+ crypto:generate_key(Algorithm, Args);
generate_key(Algorithm, Args) ->
{Public,Private} = crypto:generate_key(Algorithm, Args),
{crypto:bytes_to_integer(Public), crypto:bytes_to_integer(Private)}.
-
+
compute_key(Algorithm, OthersPublic, MyPrivate, Args) ->
Shared = crypto:compute_key(Algorithm, OthersPublic, MyPrivate, Args),
crypto:bytes_to_integer(Shared).
@@ -2026,6 +2117,20 @@ same(Algs) -> [{client2server,Algs}, {server2client,Algs}].
%%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%%% Compare two binaries in a timing safe maner.
+%%% The time spent in comparing should not be different depending on where in the binaries they differ.
+%%% This is to avoid a certain side-channel attac.
+equal_const_time(X1, X2) -> equal_const_time(X1, X2, true).
+
+equal_const_time(<<B1,R1/binary>>, <<B2,R2/binary>>, Truth) ->
+ equal_const_time(R1, R2, Truth and (B1 == B2));
+equal_const_time(<<>>, <<>>, Truth) ->
+ Truth;
+equal_const_time(_, _, _) ->
+ false.
+
+%%%-------- Remove CR, LF and following characters from a line
+
trim_tail(Str) ->
lists:takewhile(fun(C) ->
C=/=$\r andalso C=/=$\n
diff --git a/lib/ssh/test/ssh_bench_SUITE.erl b/lib/ssh/test/ssh_bench_SUITE.erl
index b6c6147646..441cf97234 100644
--- a/lib/ssh/test/ssh_bench_SUITE.erl
+++ b/lib/ssh/test/ssh_bench_SUITE.erl
@@ -65,10 +65,10 @@ init_per_suite(Config) ->
{preferred_algorithms, Algs},
{modify_algorithms,[{prepend,[{cipher,[none]},
{mac,[none]}
- ]},
- {rm, [{cipher,['[email protected]',
- '[email protected]']}
- ]}
+ ]}
+ %% ,{rm, [{cipher,['[email protected]',
+ %% '[email protected]']}
+ %% ]}
]},
{max_random_length_padding, 0},
{subsystems, [{"/dev/null", {ssh_bench_dev_null,[DataSize]}}]}
@@ -152,7 +152,8 @@ transfer_text(Config) ->
|| {Crypto,Mac} <- [{ none, none},
{'aes128-ctr', 'hmac-sha1'},
{'aes256-ctr', 'hmac-sha1'},
-%% {'[email protected]', 'hmac-sha1'},
+{'[email protected]', 'hmac-sha1'},
+{'[email protected]', 'hmac-sha1'},
{'aes128-cbc', 'hmac-sha1'},
{'3des-cbc', 'hmac-sha1'},
{'aes128-ctr', 'hmac-sha2-256'},
@@ -182,29 +183,31 @@ gen_data(DataSz) ->
%% {suite, ?MODULE},
%% {name, mk_name(["Transfer 1M bytes ",Cipher,"/",Mac," [µs]"])}]);
connect_measure(Port, Cipher, Mac, Data, Options) ->
- AES_GCM = {cipher,['[email protected]',
- '[email protected]']},
+ AES_GCM = {cipher,
+ []},
+ %% ['[email protected]',
+ %% '[email protected]']},
AlgOpt = case {Cipher,Mac} of
{none,none} ->
[{modify_algorithms,[{prepend, [{cipher,[Cipher]},
- {mac,[Mac]}]},
- {rm,[AES_GCM]}
+ {mac,[Mac]}]}
+%%% ,{rm,[AES_GCM]}
]}];
{none,_} ->
- [{modify_algorithms,[{prepend, [{cipher,[Cipher]}]},
- {rm,[AES_GCM]}
+ [{modify_algorithms,[{prepend, [{cipher,[Cipher]}]}
+%%% ,{rm,[AES_GCM]}
]},
{preferred_algorithms, [{mac,[Mac]}]}];
{_,none} ->
- [{modify_algorithms,[{prepend, [{mac,[Mac]}]},
- {rm,[AES_GCM]}
+ [{modify_algorithms,[{prepend, [{mac,[Mac]}]}
+%%% ,{rm,[AES_GCM]}
]},
{preferred_algorithms, [{cipher,[Cipher]}]}];
_ ->
[{preferred_algorithms, [{cipher,[Cipher]},
- {mac,[Mac]}]},
- {modify_algorithms, [{rm,[AES_GCM]}]}
+ {mac,[Mac]}]}
+%%% ,{modify_algorithms, [{rm,[AES_GCM]}]}
]
end,
Times =
generated by cgit v1.2.3 (git 2.25.1) at 2024-12-19 09:20:04 +0000