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%% This Source Code Form is subject to the terms of the Mozilla Public
%% License, v. 2.0. If a copy of the MPL was not distributed with this
%% file, You can obtain one at https://mozilla.org/MPL/2.0/.
%%
%% Copyright (c) 2007-2020 VMware, Inc. or its affiliates. All rights reserved.
%%
-module(rabbit_ssl).
-include_lib("public_key/include/public_key.hrl").
-export([peer_cert_issuer/1, peer_cert_subject/1, peer_cert_validity/1]).
-export([peer_cert_subject_items/2, peer_cert_auth_name/1]).
-export([cipher_suites_erlang/2, cipher_suites_erlang/1,
cipher_suites_openssl/2, cipher_suites_openssl/1,
cipher_suites/1]).
%%--------------------------------------------------------------------------
-export_type([certificate/0]).
% Due to API differences between OTP releases.
-dialyzer(no_missing_calls).
-ignore_xref([{ssl_cipher_format, suite_legacy, 1},
{ssl_cipher_format, suite, 1},
{ssl_cipher_format, suite_to_str, 1},
{ssl_cipher_format, erl_suite_definition, 1},
{ssl_cipher_format, suite_map_to_openssl_str, 1},
{ssl_cipher_format, suite_map_to_bin, 1}]).
-type certificate() :: rabbit_cert_info:certificate().
-type cipher_suites_mode() :: default | all | anonymous.
-spec cipher_suites(cipher_suites_mode()) -> ssl:ciphers().
cipher_suites(Mode) ->
Version = get_highest_protocol_version(),
ssl:cipher_suites(Mode, Version).
-spec cipher_suites_erlang(cipher_suites_mode()) ->
[ssl:old_cipher_suite()].
cipher_suites_erlang(Mode) ->
Version = get_highest_protocol_version(),
cipher_suites_erlang(Mode, Version).
-spec cipher_suites_erlang(cipher_suites_mode(),
ssl:protocol_version() | tls_record:tls_version()) ->
[ssl:old_cipher_suite()].
cipher_suites_erlang(Mode, Version) ->
[ format_cipher_erlang(C)
|| C <- ssl:cipher_suites(Mode, Version) ].
-spec cipher_suites_openssl(cipher_suites_mode()) ->
[ssl:old_cipher_suite()].
cipher_suites_openssl(Mode) ->
Version = get_highest_protocol_version(),
cipher_suites_openssl(Mode, Version).
-spec cipher_suites_openssl(cipher_suites_mode(),
ssl:protocol_version() | tls_record:tls_version()) ->
[ssl:old_cipher_suite()].
cipher_suites_openssl(Mode, Version) ->
lists:filtermap(fun(C) ->
OpenSSL = format_cipher_openssl(C),
case is_list(OpenSSL) of
true -> {true, OpenSSL};
false -> false
end
end,
ssl:cipher_suites(Mode, Version)).
format_cipher_erlang(Cipher) ->
case erlang:function_exported(ssl_cipher_format, suite_map_to_bin, 1) of
true ->
format_cipher_erlang22(Cipher);
false ->
format_cipher_erlang21(Cipher)
end.
format_cipher_erlang22(Cipher) ->
ssl_cipher_format:suite_legacy(ssl_cipher_format:suite_map_to_bin(Cipher)).
format_cipher_erlang21(Cipher) ->
ssl_cipher_format:erl_suite_definition(ssl_cipher_format:suite(Cipher)).
format_cipher_openssl(Cipher) ->
case erlang:function_exported(ssl_cipher_format, suite_map_to_bin, 1) of
true ->
format_cipher_openssl22(Cipher);
false ->
format_cipher_openssl21(Cipher)
end.
format_cipher_openssl22(Cipher) ->
ssl_cipher_format:suite_map_to_openssl_str(Cipher).
format_cipher_openssl21(Cipher) ->
ssl_cipher_format:suite_to_str(Cipher).
-spec get_highest_protocol_version() -> tls_record:tls_atom_version().
get_highest_protocol_version() ->
tls_record:protocol_version(
tls_record:highest_protocol_version([])).
%%--------------------------------------------------------------------------
%% High-level functions used by reader
%%--------------------------------------------------------------------------
%% Return a string describing the certificate's issuer.
peer_cert_issuer(Cert) ->
rabbit_cert_info:issuer(Cert).
%% Return a string describing the certificate's subject, as per RFC4514.
peer_cert_subject(Cert) ->
rabbit_cert_info:subject(Cert).
%% Return the parts of the certificate's subject.
peer_cert_subject_items(Cert, Type) ->
rabbit_cert_info:subject_items(Cert, Type).
%% Return a string describing the certificate's validity.
peer_cert_validity(Cert) ->
rabbit_cert_info:validity(Cert).
%% Extract a username from the certificate
-spec peer_cert_auth_name
(certificate()) -> binary() | 'not_found' | 'unsafe'.
peer_cert_auth_name(Cert) ->
{ok, Mode} = application:get_env(rabbit, ssl_cert_login_from),
peer_cert_auth_name(Mode, Cert).
peer_cert_auth_name(distinguished_name, Cert) ->
case auth_config_sane() of
true -> iolist_to_binary(peer_cert_subject(Cert));
false -> unsafe
end;
peer_cert_auth_name(common_name, Cert) ->
%% If there is more than one CN then we join them with "," in a
%% vaguely DN-like way. But this is more just so we do something
%% more intelligent than crashing, if you actually want to escape
%% things properly etc, use DN mode.
case auth_config_sane() of
true -> case peer_cert_subject_items(Cert, ?'id-at-commonName') of
not_found -> not_found;
CNs -> list_to_binary(string:join(CNs, ","))
end;
false -> unsafe
end.
auth_config_sane() ->
{ok, Opts} = application:get_env(rabbit, ssl_options),
case proplists:get_value(verify, Opts) of
verify_peer -> true;
V -> rabbit_log:warning("SSL certificate authentication "
"disabled, verify=~p~n", [V]),
false
end.
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