diff options
Diffstat (limited to 'lib/ssl/src/ssl_handshake.erl')
| -rw-r--r-- | lib/ssl/src/ssl_handshake.erl | 195 |
1 files changed, 138 insertions, 57 deletions
diff --git a/lib/ssl/src/ssl_handshake.erl b/lib/ssl/src/ssl_handshake.erl index 245cd3e280..88ccb94e0b 100644 --- a/lib/ssl/src/ssl_handshake.erl +++ b/lib/ssl/src/ssl_handshake.erl @@ -31,13 +31,25 @@ -include("ssl_srp.hrl"). -include_lib("public_key/include/public_key.hrl"). +-export_type([ssl_handshake/0, ssl_handshake_history/0, + public_key_info/0, oid/0]). + +-type oid() :: tuple(). +-type public_key_params() :: #'Dss-Parms'{} | {namedCurve, oid()} | #'ECParameters'{} | term(). +-type public_key_info() :: {oid(), #'RSAPublicKey'{} | integer() | #'ECPoint'{}, public_key_params()}. +-type ssl_handshake_history() :: {[binary()], [binary()]}. + +-type ssl_handshake() :: #server_hello{} | #server_hello_done{} | #certificate{} | #certificate_request{} | + #client_key_exchange{} | #finished{} | #certificate_verify{} | + #hello_request{} | #next_protocol{}. + %% Handshake messages -export([hello_request/0, server_hello/4, server_hello_done/0, certificate/4, certificate_request/4, key_exchange/3, finished/5, next_protocol/1]). %% Handle handshake messages --export([certify/7, client_certificate_verify/6, certificate_verify/6, verify_signature/5, +-export([certify/8, client_certificate_verify/6, certificate_verify/6, verify_signature/5, master_secret/5, server_key_exchange_hash/2, verify_connection/6, init_handshake_history/0, update_handshake_history/2, verify_server_key/5 ]). @@ -61,7 +73,8 @@ ]). %% MISC --export([select_version/3, prf/5, select_hashsign/2, select_cert_hashsign/3, +-export([select_version/3, prf/5, select_hashsign/3, + select_hashsign_algs/2, select_hashsign_algs/3, premaster_secret/2, premaster_secret/3, premaster_secret/4]). %%==================================================================== @@ -80,7 +93,7 @@ hello_request() -> #hello_request{}. %%-------------------------------------------------------------------- --spec server_hello(#session{}, tls_version(), #connection_states{}, +-spec server_hello(#session{}, ssl_record:ssl_version(), #connection_states{}, #hello_extensions{}) -> #server_hello{}. %% %% Description: Creates a server hello message. @@ -164,8 +177,8 @@ next_protocol(SelectedProtocol) -> %%-------------------------------------------------------------------- -spec client_certificate_verify(undefined | der_cert(), binary(), - tls_version(), term(), public_key:private_key(), - tls_handshake_history()) -> + ssl_record:ssl_version(), term(), public_key:private_key(), + ssl_handshake_history()) -> #certificate_verify{} | ignore | #alert{}. %% %% Description: Creates a certificate_verify message, called by the client. @@ -188,13 +201,13 @@ client_certificate_verify(OwnCert, MasterSecret, Version, end. %%-------------------------------------------------------------------- --spec certificate_request(erl_cipher_suite(), db_handle(), certdb_ref(), tls_version()) -> +-spec certificate_request(ssl_cipher:cipher_suite(), db_handle(), certdb_ref(), ssl_record:ssl_version()) -> #certificate_request{}. %% %% Description: Creates a certificate_request message, called by the server. %%-------------------------------------------------------------------- certificate_request(CipherSuite, CertDbHandle, CertDbRef, Version) -> - Types = certificate_types(CipherSuite), + Types = certificate_types(ssl_cipher:suite_definition(CipherSuite), Version), HashSigns = advertised_hash_signs(Version), Authorities = certificate_authorities(CertDbHandle, CertDbRef), #certificate_request{ @@ -203,7 +216,7 @@ certificate_request(CipherSuite, CertDbHandle, CertDbRef, Version) -> certificate_authorities = Authorities }. %%-------------------------------------------------------------------- --spec key_exchange(client | server, tls_version(), +-spec key_exchange(client | server, ssl_record:ssl_version(), {premaster_secret, binary(), public_key_info()} | {dh, binary()} | {dh, {binary(), binary()}, #'DHParameter'{}, {HashAlgo::atom(), SignAlgo::atom()}, @@ -304,7 +317,7 @@ key_exchange(server, Version, {srp, {PublicKey, _}, ClientRandom, ServerRandom, PrivateKey). %%-------------------------------------------------------------------- --spec finished(tls_version(), client | server, integer(), binary(), tls_handshake_history()) -> +-spec finished(ssl_record:ssl_version(), client | server, integer(), binary(), ssl_handshake_history()) -> #finished{}. %% %% Description: Creates a handshake finished message @@ -331,8 +344,8 @@ verify_server_key(#server_key_params{params_bin = EncParams, verify_signature(Version, Hash, HashSign, Signature, PubKeyInfo). %%-------------------------------------------------------------------- --spec certificate_verify(binary(), public_key_info(), tls_version(), term(), - binary(), tls_handshake_history()) -> valid | #alert{}. +-spec certificate_verify(binary(), public_key_info(), ssl_record:ssl_version(), term(), + binary(), ssl_handshake_history()) -> valid | #alert{}. %% %% Description: Checks that the certificate_verify message is valid. %%-------------------------------------------------------------------- @@ -346,7 +359,7 @@ certificate_verify(Signature, PublicKeyInfo, Version, ?ALERT_REC(?FATAL, ?BAD_CERTIFICATE) end. %%-------------------------------------------------------------------- --spec verify_signature(tls_version(), binary(), {term(), term()}, binary(), +-spec verify_signature(ssl_record:ssl_version(), binary(), {term(), term()}, binary(), public_key_info()) -> true | false. %% %% Description: Checks that a public_key signature is valid. @@ -370,13 +383,13 @@ verify_signature(_Version, Hash, {HashAlgo, ecdsa}, Signature, %%-------------------------------------------------------------------- -spec certify(#certificate{}, db_handle(), certdb_ref(), integer() | nolimit, - verify_peer | verify_none, {fun(), term}, + verify_peer | verify_none, {fun(), term}, fun(), client | server) -> {der_cert(), public_key_info()} | #alert{}. %% %% Description: Handles a certificate handshake message %%-------------------------------------------------------------------- certify(#certificate{asn1_certificates = ASN1Certs}, CertDbHandle, CertDbRef, - MaxPathLen, _Verify, VerifyFunAndState, Role) -> + MaxPathLen, _Verify, VerifyFunAndState, PartialChain, Role) -> [PeerCert | _] = ASN1Certs, ValidationFunAndState = @@ -408,7 +421,7 @@ certify(#certificate{asn1_certificates = ASN1Certs}, CertDbHandle, CertDbRef, try {TrustedErlCert, CertPath} = - ssl_certificate:trusted_cert_and_path(ASN1Certs, CertDbHandle, CertDbRef), + ssl_certificate:trusted_cert_and_path(ASN1Certs, CertDbHandle, CertDbRef, PartialChain), case public_key:pkix_path_validation(TrustedErlCert, CertPath, [{max_path_length, @@ -426,8 +439,8 @@ certify(#certificate{asn1_certificates = ASN1Certs}, CertDbHandle, CertDbRef, end. %%-------------------------------------------------------------------- --spec verify_connection(tls_version(), #finished{}, client | server, integer(), binary(), - tls_handshake_history()) -> verified | #alert{}. +-spec verify_connection(ssl_record:ssl_version(), #finished{}, client | server, integer(), binary(), + ssl_handshake_history()) -> verified | #alert{}. %% %% Description: Checks the ssl handshake finished message to verify %% the connection. @@ -443,7 +456,7 @@ verify_connection(Version, #finished{verify_data = Data}, end. %%-------------------------------------------------------------------- --spec init_handshake_history() -> tls_handshake_history(). +-spec init_handshake_history() -> ssl_handshake_history(). %% %% Description: Initialize the empty handshake history buffer. @@ -452,8 +465,8 @@ init_handshake_history() -> {[], []}. %%-------------------------------------------------------------------- --spec update_handshake_history(tls_handshake_history(), Data ::term()) -> - tls_handshake_history(). +-spec update_handshake_history(ssl_handshake:ssl_handshake_history(), Data ::term()) -> + ssl_handshake:ssl_handshake_history(). %% %% Description: Update the handshake history buffer with Data. %%-------------------------------------------------------------------- @@ -567,7 +580,7 @@ server_key_exchange_hash(md5sha, Value) -> server_key_exchange_hash(Hash, Value) -> crypto:hash(Hash, Value). %%-------------------------------------------------------------------- --spec prf(tls_version(), binary(), binary(), [binary()], non_neg_integer()) -> +-spec prf(ssl_record:ssl_version(), binary(), binary(), [binary()], non_neg_integer()) -> {ok, binary()} | {error, undefined}. %% %% Description: use the TLS PRF to generate key material @@ -578,23 +591,25 @@ prf({3,1}, Secret, Label, Seed, WantedLength) -> {ok, tls_v1:prf(?MD5SHA, Secret, Label, Seed, WantedLength)}; prf({3,_N}, Secret, Label, Seed, WantedLength) -> {ok, tls_v1:prf(?SHA256, Secret, Label, Seed, WantedLength)}. + + %%-------------------------------------------------------------------- --spec select_hashsign(#hash_sign_algos{}| undefined, undefined | binary()) -> - [{atom(), atom()}] | undefined. +-spec select_hashsign(#hash_sign_algos{}| undefined, undefined | binary(), ssl_record:ssl_version()) -> + {atom(), atom()} | undefined. %% %% Description: %%-------------------------------------------------------------------- -select_hashsign(_, undefined) -> +select_hashsign(_, undefined, _Version) -> {null, anon}; -select_hashsign(undefined, Cert) -> +select_hashsign(undefined, Cert, Version) -> #'OTPCertificate'{tbsCertificate = TBSCert} = public_key:pkix_decode_cert(Cert, otp), #'OTPSubjectPublicKeyInfo'{algorithm = {_,Algo, _}} = TBSCert#'OTPTBSCertificate'.subjectPublicKeyInfo, - select_cert_hashsign(undefined, Algo, {undefined, undefined}); -select_hashsign(#hash_sign_algos{hash_sign_algos = HashSigns}, Cert) -> + select_hashsign_algs(undefined, Algo, Version); +select_hashsign(#hash_sign_algos{hash_sign_algos = HashSigns}, Cert, Version) -> #'OTPCertificate'{tbsCertificate = TBSCert} =public_key:pkix_decode_cert(Cert, otp), #'OTPSubjectPublicKeyInfo'{algorithm = {_,Algo, _}} = TBSCert#'OTPTBSCertificate'.subjectPublicKeyInfo, - DefaultHashSign = {_, Sign} = select_cert_hashsign(undefined, Algo, {undefined, undefined}), + DefaultHashSign = {_, Sign} = select_hashsign_algs(undefined, Algo, Version), case lists:filter(fun({sha, dsa}) -> true; ({_, dsa}) -> @@ -610,28 +625,61 @@ select_hashsign(#hash_sign_algos{hash_sign_algos = HashSigns}, Cert) -> [HashSign| _] -> HashSign end. + %%-------------------------------------------------------------------- --spec select_cert_hashsign(#hash_sign_algos{}| undefined, oid(), tls_version() | {undefined, undefined}) -> +-spec select_hashsign_algs(#hash_sign_algos{}| undefined, oid(), ssl_record:ssl_version()) -> {atom(), atom()}. +%% Description: For TLS 1.2 hash function and signature algorithm pairs can be +%% negotiated with the signature_algorithms extension, +%% for previous versions always use appropriate defaults. +%% RFC 5246, Sect. 7.4.1.4.1. Signature Algorithms +%% If the client does not send the signature_algorithms extension, the +%% server MUST do the following: (e.i defaults for TLS 1.2) %% -%% Description: For TLS 1.2 selected cert_hash_sign will be recived -%% in the handshake message, for previous versions use appropriate defaults. -%% This function is also used by select_hashsign to extract -%% the alogrithm of the server cert key. +%% - If the negotiated key exchange algorithm is one of (RSA, DHE_RSA, +%% DH_RSA, RSA_PSK, ECDH_RSA, ECDHE_RSA), behave as if client had +%% sent the value {sha1,rsa}. +%% +%% - If the negotiated key exchange algorithm is one of (DHE_DSS, +%% DH_DSS), behave as if the client had sent the value {sha1,dsa}. +%% +%% - If the negotiated key exchange algorithm is one of (ECDH_ECDSA, +%% ECDHE_ECDSA), behave as if the client had sent value {sha1,ecdsa}. + %%-------------------------------------------------------------------- -select_cert_hashsign(HashSign, _, {Major, Minor}) when HashSign =/= undefined andalso +select_hashsign_algs(HashSign, _, {Major, Minor}) when HashSign =/= undefined andalso Major >= 3 andalso Minor >= 3 -> HashSign; -select_cert_hashsign(undefined,?'id-ecPublicKey', _) -> +select_hashsign_algs(undefined, ?rsaEncryption, {Major, Minor}) when Major >= 3 andalso Minor >= 3 -> + {sha, rsa}; +select_hashsign_algs(undefined,?'id-ecPublicKey', _) -> {sha, ecdsa}; -select_cert_hashsign(undefined, ?rsaEncryption, _) -> +select_hashsign_algs(undefined, ?rsaEncryption, _) -> {md5sha, rsa}; -select_cert_hashsign(undefined, ?'id-dsa', _) -> +select_hashsign_algs(undefined, ?'id-dsa', _) -> {sha, dsa}. +-spec select_hashsign_algs(atom(), ssl_record:ssl_version()) -> {atom(), atom()}. +%% Wrap function to keep the knowledge of the default values in +%% one place only +select_hashsign_algs(Alg, Version) when (Alg == rsa orelse + Alg == dhe_rsa orelse + Alg == dh_rsa orelse + Alg == ecdhe_rsa orelse + Alg == ecdh_rsa orelse + Alg == srp_rsa) -> + select_hashsign_algs(undefined, ?rsaEncryption, Version); +select_hashsign_algs(Alg, Version) when (Alg == dhe_dss orelse + Alg == dh_dss orelse + Alg == srp_dss) -> + select_hashsign_algs(undefined, ?'id-dsa', Version); +select_hashsign_algs(Alg, Version) when (Alg == ecdhe_ecdsa orelse + Alg == ecdh_ecdsa) -> + select_hashsign_algs(undefined, ?'id-ecPublicKey', Version). + %%-------------------------------------------------------------------- --spec master_secret(atom(), tls_version(), #session{} | binary(), #connection_states{}, +-spec master_secret(atom(), ssl_record:ssl_version(), #session{} | binary(), #connection_states{}, client | server) -> {binary(), #connection_states{}} | #alert{}. %% %% Description: Sets or calculates the master secret and calculate keys, @@ -816,7 +864,7 @@ enc_server_key_exchange(Version, Params, {HashAlgo, SignAlgo}, end. %%-------------------------------------------------------------------- --spec decode_client_key(binary(), key_algo(), tls_version()) -> +-spec decode_client_key(binary(), ssl_cipher:key_algo(), ssl_record:ssl_version()) -> #encrypted_premaster_secret{} | #client_diffie_hellman_public{} | #client_ec_diffie_hellman_public{} @@ -831,7 +879,7 @@ decode_client_key(ClientKey, Type, Version) -> dec_client_key(ClientKey, key_exchange_alg(Type), Version). %%-------------------------------------------------------------------- --spec decode_server_key(binary(), key_algo(), tls_version()) -> +-spec decode_server_key(binary(), ssl_cipher:key_algo(), ssl_record:ssl_version()) -> #server_key_params{}. %% %% Description: Decode server_key data and return appropriate type @@ -1005,12 +1053,9 @@ decode_suites('3_bytes', Dec) -> %%-------------Cipeher suite handling -------------------------------- available_suites(UserSuites, Version) -> - case UserSuites of - [] -> - ssl_cipher:suites(Version); - _ -> - UserSuites - end. + lists:filtermap(fun(Suite) -> + lists:member(Suite, ssl_cipher:all_suites(Version)) + end, UserSuites). available_suites(ServerCert, UserSuites, Version, Curve) -> ssl_cipher:filter(ServerCert, available_suites(UserSuites, Version)) @@ -1053,19 +1098,31 @@ supported_ecc(_) -> %%-------------certificate handling -------------------------------- -certificate_types({KeyExchange, _, _, _}) - when KeyExchange == rsa; - KeyExchange == dhe_dss; - KeyExchange == dhe_rsa; - KeyExchange == ecdhe_rsa -> - <<?BYTE(?RSA_SIGN), ?BYTE(?DSS_SIGN)>>; +certificate_types(_, {N, M}) when N >= 3 andalso M >= 3 -> + case proplists:get_bool(ecdsa, + proplists:get_value(public_keys, crypto:supports())) of + true -> + <<?BYTE(?ECDSA_SIGN), ?BYTE(?RSA_SIGN), ?BYTE(?DSS_SIGN)>>; + false -> + <<?BYTE(?RSA_SIGN), ?BYTE(?DSS_SIGN)>> + end; + +certificate_types({KeyExchange, _, _, _}, _) when KeyExchange == rsa; + KeyExchange == dhe_rsa; + KeyExchange == ecdhe_rsa -> + <<?BYTE(?RSA_SIGN)>>; + +certificate_types({KeyExchange, _, _, _}, _) when KeyExchange == dhe_dss; + KeyExchange == srp_dss -> + <<?BYTE(?DSS_SIGN)>>; -certificate_types({KeyExchange, _, _, _}) - when KeyExchange == dh_ecdsa; - KeyExchange == dhe_ecdsa -> +certificate_types({KeyExchange, _, _, _}, _) when KeyExchange == dh_ecdsa; + KeyExchange == dhe_ecdsa; + KeyExchange == ecdh_ecdsa; + KeyExchange == ecdhe_ecdsa -> <<?BYTE(?ECDSA_SIGN)>>; -certificate_types(_) -> +certificate_types(_, _) -> <<?BYTE(?RSA_SIGN)>>. certificate_authorities(CertDbHandle, CertDbRef) -> @@ -1654,7 +1711,16 @@ dec_hello_extensions(<<?UINT16(?SIGNATURE_ALGORITHMS_EXT), ?UINT16(Len), dec_hello_extensions(<<?UINT16(?ELLIPTIC_CURVES_EXT), ?UINT16(Len), ExtData:Len/binary, Rest/binary>>, Acc) -> <<?UINT16(_), EllipticCurveList/binary>> = ExtData, - EllipticCurves = [tls_v1:enum_to_oid(X) || <<X:16>> <= EllipticCurveList], + %% Ignore unknown curves + Pick = fun(Enum) -> + case tls_v1:enum_to_oid(Enum) of + undefined -> + false; + Oid -> + {true, Oid} + end + end, + EllipticCurves = lists:filtermap(Pick, [ECC || <<ECC:16>> <= EllipticCurveList]), dec_hello_extensions(Rest, Acc#hello_extensions{elliptic_curves = #elliptic_curves{elliptic_curve_list = EllipticCurves}}); @@ -1665,6 +1731,14 @@ dec_hello_extensions(<<?UINT16(?EC_POINT_FORMATS_EXT), ?UINT16(Len), dec_hello_extensions(Rest, Acc#hello_extensions{ec_point_formats = #ec_point_formats{ec_point_format_list = ECPointFormats}}); + +dec_hello_extensions(<<?UINT16(?SNI_EXT), ?UINT16(Len), Rest/binary>>, Acc) when Len == 0 -> + dec_hello_extensions(Rest, Acc#hello_extensions{sni = ""}); %% Server may send an empy SNI + +dec_hello_extensions(<<?UINT16(?SNI_EXT), ?UINT16(Len), + ExtData:Len/binary, Rest/binary>>, Acc) -> + <<?UINT16(_), NameList/binary>> = ExtData, + dec_hello_extensions(Rest, Acc#hello_extensions{sni = dec_sni(NameList)}); %% Ignore data following the ClientHello (i.e., %% extensions) if not understood. @@ -1677,6 +1751,13 @@ dec_hello_extensions(_, Acc) -> dec_hashsign(<<?BYTE(HashAlgo), ?BYTE(SignAlgo)>>) -> {ssl_cipher:hash_algorithm(HashAlgo), ssl_cipher:sign_algorithm(SignAlgo)}. +%% Ignore unknown names (only host_name is supported) +dec_sni(<<?BYTE(?SNI_NAMETYPE_HOST_NAME), ?UINT16(Len), + HostName:Len/binary, _/binary>>) -> + #sni{hostname = binary_to_list(HostName)}; +dec_sni(<<?BYTE(_), ?UINT16(Len), _:Len, Rest/binary>>) -> dec_sni(Rest); +dec_sni(_) -> undefined. + decode_next_protocols({next_protocol_negotiation, Protocols}) -> decode_next_protocols(Protocols, []). decode_next_protocols(<<>>, Acc) -> |