From 0bb96516ce308b6fb837696338b492d3c9a9f429 Mon Sep 17 00:00:00 2001 From: Ingela Anderton Andin Date: Fri, 6 Oct 2017 17:24:16 +0200 Subject: ssl: Extend hostname check to fallback to checking IP-address If no SNI is available and the hostname is an IP-address also check for IP-address match. This check is not as good as a DNS hostname check and certificates using IP-address are not recommended. --- lib/ssl/src/ssl_handshake.erl | 18 +++++++++++++----- 1 file changed, 13 insertions(+), 5 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 b1661624b5..0ee9ee3322 100644 --- a/lib/ssl/src/ssl_handshake.erl +++ b/lib/ssl/src/ssl_handshake.erl @@ -50,7 +50,7 @@ finished/5, next_protocol/1]). %% Handle handshake messages --export([certify/6, client_certificate_verify/6, certificate_verify/6, verify_signature/5, +-export([certify/7, client_certificate_verify/6, certificate_verify/6, verify_signature/5, master_secret/4, server_key_exchange_hash/2, verify_connection/6, init_handshake_history/0, update_handshake_history/3, verify_server_key/5 ]). @@ -389,21 +389,21 @@ verify_signature(_, Hash, {HashAlgo, _SignAlg}, Signature, %%-------------------------------------------------------------------- -spec certify(#certificate{}, db_handle(), certdb_ref(), #ssl_options{}, term(), - client | server) -> {der_cert(), public_key_info()} | #alert{}. + client | server, inet:hostname() | inet:ip_address()) -> {der_cert(), public_key_info()} | #alert{}. %% %% Description: Handles a certificate handshake message %%-------------------------------------------------------------------- certify(#certificate{asn1_certificates = ASN1Certs}, CertDbHandle, CertDbRef, - Opts, CRLDbHandle, Role) -> + Opts, CRLDbHandle, Role, Host) -> + ServerName = server_name(Opts#ssl_options.server_name_indication, Host, Role), [PeerCert | _] = ASN1Certs, try {TrustedCert, CertPath} = ssl_certificate:trusted_cert_and_path(ASN1Certs, CertDbHandle, CertDbRef, Opts#ssl_options.partial_chain), ValidationFunAndState = validation_fun_and_state(Opts#ssl_options.verify_fun, Role, - CertDbHandle, CertDbRef, - Opts#ssl_options.server_name_indication, + CertDbHandle, CertDbRef, ServerName, Opts#ssl_options.crl_check, CRLDbHandle, CertPath), case public_key:pkix_path_validation(TrustedCert, CertPath, @@ -1528,6 +1528,8 @@ select_shared_curve([Curve | Rest], Curves) -> sni(undefined) -> undefined; +sni(disable) -> + undefined; sni(Hostname) -> #sni{hostname = Hostname}. @@ -2353,3 +2355,9 @@ available_signature_algs(#hash_sign_algos{hash_sign_algos = ClientHashSigns}, Su available_signature_algs(_, _, _, _) -> undefined. +server_name(_, _, server) -> + undefined; %% Not interesting to check your own name. +server_name(undefined, Host, client) -> + {fallback, Host}; %% Fallback to Host argument to connect +server_name(SNI, _, client) -> + SNI. %% If Server Name Indication is available -- cgit v1.2.3