From 4d24ae9a4d4b96a3791eb3def2c672d7ec644c8c Mon Sep 17 00:00:00 2001 From: Ingela Anderton Andin Date: Tue, 19 Oct 2010 09:29:02 +0200 Subject: Correct handling of client certificate verify message When checking the client certificate verify message the server used the wrong algorithm identifier to determine the signing algorithm, causing a function clause error in the public_key application when the key-exchange algorithm and the public key algorithm of the client certificate happen to differ. --- lib/ssl/src/ssl_handshake.erl | 74 +++++++++++++++++++------------------------ 1 file changed, 33 insertions(+), 41 deletions(-) (limited to 'lib/ssl/src/ssl_handshake.erl') diff --git a/lib/ssl/src/ssl_handshake.erl b/lib/ssl/src/ssl_handshake.erl index b9b1ccb134..a6d39f0af1 100644 --- a/lib/ssl/src/ssl_handshake.erl +++ b/lib/ssl/src/ssl_handshake.erl @@ -33,11 +33,11 @@ -export([master_secret/4, client_hello/5, server_hello/4, hello/4, hello_request/0, certify/6, certificate/3, - client_certificate_verify/6, certificate_verify/6, + client_certificate_verify/5, certificate_verify/5, certificate_request/2, key_exchange/2, server_key_exchange_hash/2, finished/4, verify_connection/5, get_tls_handshake/2, - decode_client_key/3, server_hello_done/0, sig_alg/1, - encode_handshake/3, init_hashes/0, update_hashes/2, + decode_client_key/3, server_hello_done/0, + encode_handshake/2, init_hashes/0, update_hashes/2, decrypt_premaster_secret/2]). -type tls_handshake() :: #client_hello{} | #server_hello{} | @@ -252,17 +252,17 @@ certificate(OwnCert, CertDbRef, server) -> %%-------------------------------------------------------------------- -spec client_certificate_verify(undefined | der_cert(), binary(), - tls_version(), key_algo(), private_key(), + tls_version(), private_key(), {{binary(), binary()},{binary(), binary()}}) -> #certificate_verify{} | ignore | #alert{}. %% %% Description: Creates a certificate_verify message, called by the client. %%-------------------------------------------------------------------- -client_certificate_verify(undefined, _, _, _, _, _) -> +client_certificate_verify(undefined, _, _, _, _) -> ignore; -client_certificate_verify(_, _, _, _, undefined, _) -> +client_certificate_verify(_, _, _, undefined, _) -> ignore; -client_certificate_verify(OwnCert, MasterSecret, Version, Algorithm, +client_certificate_verify(OwnCert, MasterSecret, Version, PrivateKey, {Hashes0, _}) -> case public_key:pkix_is_fixed_dh_cert(OwnCert) of true -> @@ -270,33 +270,30 @@ client_certificate_verify(OwnCert, MasterSecret, Version, Algorithm, false -> Hashes = calc_certificate_verify(Version, MasterSecret, - Algorithm, Hashes0), + alg_oid(PrivateKey), Hashes0), Signed = digitally_signed(Hashes, PrivateKey), #certificate_verify{signature = Signed} end. %%-------------------------------------------------------------------- -%% -spec certificate_verify(binary(), public_key_info(), tls_version(), -%% binary(), key_algo(), -%% {_, {binary(), binary()}}) -> valid | #alert{}. +-spec certificate_verify(binary(), public_key_info(), tls_version(), + binary(), {_, {binary(), binary()}}) -> valid | #alert{}. %% %% Description: Checks that the certificate_verify message is valid. %%-------------------------------------------------------------------- -certificate_verify(Signature, {_, PublicKey, _}, Version, - MasterSecret, Algorithm, {_, Hashes0}) - when Algorithm == rsa; - Algorithm == dhe_rsa -> +certificate_verify(Signature, {?'rsaEncryption'= Algorithm, PublicKey, _}, Version, + MasterSecret, {_, Hashes0}) -> Hashes = calc_certificate_verify(Version, MasterSecret, Algorithm, Hashes0), - case public_key:decrypt_public(Signature, PublicKey, + case public_key:decrypt_public(Signature, PublicKey, [{rsa_pad, rsa_pkcs1_padding}]) of Hashes -> valid; _ -> ?ALERT_REC(?FATAL, ?BAD_CERTIFICATE) end; -certificate_verify(Signature, {_, PublicKey, PublicKeyParams}, Version, - MasterSecret, dhe_dss = Algorithm, {_, Hashes0}) -> +certificate_verify(Signature, {?'id-dsa' = Algorithm, PublicKey, PublicKeyParams}, Version, + MasterSecret, {_, Hashes0}) -> Hashes = calc_certificate_verify(Version, MasterSecret, Algorithm, Hashes0), case public_key:verify(Hashes, none, Signature, {PublicKey, PublicKeyParams}) of @@ -441,13 +438,12 @@ server_hello_done() -> #server_hello_done{}. %%-------------------------------------------------------------------- --spec encode_handshake(tls_handshake(), tls_version(), key_algo()) -> iolist(). +-spec encode_handshake(tls_handshake(), tls_version()) -> iolist(). %% %% Description: Encode a handshake packet to binary %%-------------------------------------------------------------------- -encode_handshake(Package, Version, KeyAlg) -> - SigAlg = sig_alg(KeyAlg), - {MsgType, Bin} = enc_hs(Package, Version, SigAlg), +encode_handshake(Package, Version) -> + {MsgType, Bin} = enc_hs(Package, Version), Len = byte_size(Bin), [MsgType, ?uint24(Len), Bin]. @@ -884,14 +880,14 @@ certs_from_list(ACList) -> <> end || Cert <- ACList]). -enc_hs(#hello_request{}, _Version, _) -> +enc_hs(#hello_request{}, _Version) -> {?HELLO_REQUEST, <<>>}; enc_hs(#client_hello{client_version = {Major, Minor}, random = Random, session_id = SessionID, cipher_suites = CipherSuites, compression_methods = CompMethods, - renegotiation_info = RenegotiationInfo}, _Version, _) -> + renegotiation_info = RenegotiationInfo}, _Version) -> SIDLength = byte_size(SessionID), BinCompMethods = list_to_binary(CompMethods), CmLength = byte_size(BinCompMethods), @@ -909,20 +905,20 @@ enc_hs(#server_hello{server_version = {Major, Minor}, session_id = Session_ID, cipher_suite = Cipher_suite, compression_method = Comp_method, - renegotiation_info = RenegotiationInfo}, _Version, _) -> + renegotiation_info = RenegotiationInfo}, _Version) -> SID_length = byte_size(Session_ID), Extensions = hello_extensions(RenegotiationInfo), ExtensionsBin = enc_hello_extensions(Extensions), {?SERVER_HELLO, <>}; -enc_hs(#certificate{asn1_certificates = ASN1CertList}, _Version, _) -> +enc_hs(#certificate{asn1_certificates = ASN1CertList}, _Version) -> ASN1Certs = certs_from_list(ASN1CertList), ACLen = erlang:iolist_size(ASN1Certs), {?CERTIFICATE, <>}; enc_hs(#server_key_exchange{params = #server_dh_params{ dh_p = P, dh_g = G, dh_y = Y}, - signed_params = SignedParams}, _Version, _) -> + signed_params = SignedParams}, _Version) -> PLen = byte_size(P), GLen = byte_size(G), YLen = byte_size(Y), @@ -934,21 +930,21 @@ enc_hs(#server_key_exchange{params = #server_dh_params{ }; enc_hs(#certificate_request{certificate_types = CertTypes, certificate_authorities = CertAuths}, - _Version, _) -> + _Version) -> CertTypesLen = byte_size(CertTypes), CertAuthsLen = byte_size(CertAuths), {?CERTIFICATE_REQUEST, <> }; -enc_hs(#server_hello_done{}, _Version, _) -> +enc_hs(#server_hello_done{}, _Version) -> {?SERVER_HELLO_DONE, <<>>}; -enc_hs(#client_key_exchange{exchange_keys = ExchangeKeys}, Version, _) -> +enc_hs(#client_key_exchange{exchange_keys = ExchangeKeys}, Version) -> {?CLIENT_KEY_EXCHANGE, enc_cke(ExchangeKeys, Version)}; -enc_hs(#certificate_verify{signature = BinSig}, _, _) -> +enc_hs(#certificate_verify{signature = BinSig}, _) -> EncSig = enc_bin_sig(BinSig), {?CERTIFICATE_VERIFY, EncSig}; -enc_hs(#finished{verify_data = VerifyData}, _Version, _) -> +enc_hs(#finished{verify_data = VerifyData}, _Version) -> {?FINISHED, VerifyData}. enc_cke(#encrypted_premaster_secret{premaster_secret = PKEPMS},{3, 0}) -> @@ -1107,15 +1103,6 @@ server_key_exchange_hash(Algorithm, Value) when Algorithm == rsa; server_key_exchange_hash(dhe_dss, Value) -> crypto:sha(Value). -sig_alg(dh_anon) -> - ?SIGNATURE_ANONYMOUS; -sig_alg(Alg) when Alg == dhe_rsa; Alg == rsa -> - ?SIGNATURE_RSA; -sig_alg(dhe_dss) -> - ?SIGNATURE_DSA; -sig_alg(_) -> - ?NULL. - key_exchange_alg(rsa) -> ?KEY_EXCHANGE_RSA; key_exchange_alg(Alg) when Alg == dhe_rsa; Alg == dhe_dss; @@ -1133,3 +1120,8 @@ apply_user_fun(Fun, OtpCert, ExtensionOrError, UserState0, SslState) -> {unknown, UserState} -> {unknown, {SslState, UserState}} end. + +alg_oid(#'RSAPrivateKey'{}) -> + ?'rsaEncryption'; +alg_oid(#'DSAPrivateKey'{}) -> + ?'id-dsa'. -- cgit v1.2.3