From dca65c70badd3b33903a0535ef2366eecc3e12dc Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?P=C3=A9ter=20Dimitrov?= Date: Fri, 14 Jun 2019 15:53:47 +0200 Subject: ssl: Improve handling of signature algorithms TLS 1.2 ClientHello caused handshake failure in the TLS 1.2 server if the signature_algorithms_cert extension contained legacy algorithms. Update TLS 1.2 server to properly handle legacy signature algorithms in the signature_algorithms_cert extension. Update TLS 1.3 client so that it can send legacy algorithms in its signature_algorithms_cert extension. --- lib/ssl/src/ssl_cipher.erl | 10 +++++++++- lib/ssl/src/ssl_handshake.erl | 5 +---- lib/ssl/src/tls_v1.erl | 22 ++++++++++++++++++++-- 3 files changed, 30 insertions(+), 7 deletions(-) diff --git a/lib/ssl/src/ssl_cipher.erl b/lib/ssl/src/ssl_cipher.erl index 21db887bb5..4da50d2af8 100644 --- a/lib/ssl/src/ssl_cipher.erl +++ b/lib/ssl/src/ssl_cipher.erl @@ -923,6 +923,12 @@ signature_scheme(rsa_pss_pss_sha384) -> ?RSA_PSS_PSS_SHA384; signature_scheme(rsa_pss_pss_sha512) -> ?RSA_PSS_PSS_SHA512; signature_scheme(rsa_pkcs1_sha1) -> ?RSA_PKCS1_SHA1; signature_scheme(ecdsa_sha1) -> ?ECDSA_SHA1; +%% Handling legacy signature algorithms +signature_scheme({Hash0, Sign0}) -> + Hash = hash_algorithm(Hash0), + Sign = sign_algorithm(Sign0), + <> = <>, + SigAlg; signature_scheme(?RSA_PKCS1_SHA256) -> rsa_pkcs1_sha256; signature_scheme(?RSA_PKCS1_SHA384) -> rsa_pkcs1_sha384; signature_scheme(?RSA_PKCS1_SHA512) -> rsa_pkcs1_sha512; @@ -962,7 +968,9 @@ scheme_to_components(rsa_pss_pss_sha256) -> {sha256, rsa_pss_pss, undefined}; scheme_to_components(rsa_pss_pss_sha384) -> {sha384, rsa_pss_pss, undefined}; scheme_to_components(rsa_pss_pss_sha512) -> {sha512, rsa_pss_pss, undefined}; scheme_to_components(rsa_pkcs1_sha1) -> {sha1, rsa_pkcs1, undefined}; -scheme_to_components(ecdsa_sha1) -> {sha1, ecdsa, undefined}. +scheme_to_components(ecdsa_sha1) -> {sha1, ecdsa, undefined}; +%% Handling legacy signature algorithms +scheme_to_components({Hash,Sign}) -> {Hash, Sign, undefined}. %% TODO: Add support for EC and RSA-SSA signatures diff --git a/lib/ssl/src/ssl_handshake.erl b/lib/ssl/src/ssl_handshake.erl index f68d3e9b26..3d2abb714f 100644 --- a/lib/ssl/src/ssl_handshake.erl +++ b/lib/ssl/src/ssl_handshake.erl @@ -1186,10 +1186,7 @@ signature_algs_ext(undefined) -> signature_algs_ext(SignatureSchemes0) -> %% The SSL option signature_algs contains both hash-sign algorithms (tuples) and %% signature schemes (atoms) if TLS 1.3 is configured. - %% Filter out all hash-sign tuples when creating the signature_algs extension. - %% (TLS 1.3 specific record type) - SignatureSchemes = lists:filter(fun is_atom/1, SignatureSchemes0), - #signature_algorithms{signature_scheme_list = SignatureSchemes}. + #signature_algorithms{signature_scheme_list = SignatureSchemes0}. signature_algs_cert(undefined) -> undefined; diff --git a/lib/ssl/src/tls_v1.erl b/lib/ssl/src/tls_v1.erl index 27cd5765e5..f7c8c770ae 100644 --- a/lib/ssl/src/tls_v1.erl +++ b/lib/ssl/src/tls_v1.erl @@ -606,8 +606,26 @@ signature_schemes(Version, SignatureSchemes) when is_tuple(Version) Acc end; %% Special clause for filtering out the legacy hash-sign tuples. - (_ , Acc) -> - Acc + ({Hash, dsa = Sign} = Alg, Acc) -> + case proplists:get_bool(dss, PubKeys) + andalso proplists:get_bool(Hash, Hashes) + andalso is_pair(Hash, Sign, Hashes) + of + true -> + [Alg | Acc]; + false -> + Acc + end; + ({Hash, Sign} = Alg, Acc) -> + case proplists:get_bool(Sign, PubKeys) + andalso proplists:get_bool(Hash, Hashes) + andalso is_pair(Hash, Sign, Hashes) + of + true -> + [Alg | Acc]; + false -> + Acc + end end, Supported = lists:foldl(Fun, [], SignatureSchemes), lists:reverse(Supported); -- cgit v1.2.3