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0c09952382
Using 1024 bit params for DH is considered unsafe [1]. Additionally, from [2]: "Modern servers that do not support export ciphersuites are advised to either use SSL_CTX_set_tmp_dh() or alternatively, use the callback but ignore keylength and is_export and simply supply at least 2048-bit parameters in the callback." Additionally, using 1024 bit dh params may block clients running on recent openssl version from connecting given the stricter default security requirements of those new openssl versions. The error message for these clients looks like: error:141A318A:SSL routines:tls_process_ske_dhe:dh key too small:ssl/statem/statem_clnt.c:2150 As a workaround, this error can be suppressed tweaking the cipher list (--ssl-ciphers) to either 'HIGH:!aNULL:!MD5:@SECLEVEL=1' to reduce security requirements or 'HIGH:!aNULL:!MD5:!DH' to avoid using fixed param DH based ciphers. The first option is recommended though as it likely a fixed param DH cipher is the best possible option in that situation. [1] https://weakdh.org/ [2] https://www.openssl.org/docs/man1.1.1/man3/SSL_CTX_set_tmp_dh_callback.html Signed-off-by: Jaime Caamaño Ruiz <jcaamano@redhat.com> Signed-off-by: Ben Pfaff <blp@ovn.org>
27 lines
765 B
C
27 lines
765 B
C
/*
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* Copyright (c) 2008, 2017 Nicira, Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at:
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef DHPARAMS_H
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#define DHPARAMS_H 1
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#include <inttypes.h>
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#include <openssl/dh.h>
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DH *get_dh2048(void);
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DH *get_dh4096(void);
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#endif /* dhparams.h */
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