151 lines
5.4 KiB
C
151 lines
5.4 KiB
C
/*
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* libratbox: a library used by ircd-ratbox and other things
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* openssl_ratbox.h: OpenSSL backend data
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*
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* Copyright (C) 2015-2016 Aaron Jones <aaronmdjones@gmail.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301
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* USA
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*
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*/
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#ifndef LRB_OPENSSL_H_INC
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#define LRB_OPENSSL_H_INC 1
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#include <openssl/dh.h>
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#include <openssl/ec.h>
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#include <openssl/err.h>
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#include <openssl/evp.h>
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#include <openssl/rand.h>
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#include <openssl/ssl.h>
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#include <openssl/opensslv.h>
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/*
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* A long time ago, in a world far away, OpenSSL had a well-established mechanism for ensuring compatibility with
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* regards to added, changed, and removed functions, by having an SSLEAY_VERSION_NUMBER macro. This was then
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* renamed to OPENSSL_VERSION_NUMBER, but the old macro was kept around for compatibility until OpenSSL version
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* 1.1.0.
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*
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* Then the OpenBSD developers decided that having OpenSSL in their codebase was a bad idea. They forked it to
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* create LibreSSL, gutted all of the functionality they didn't want or need, and generally improved the library
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* a lot. Then, as the OpenBSD developers are want to do, they packaged up LibreSSL for release to other
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* operating systems, as LibreSSL Portable. Think along the lines of OpenSSH where they have also done this.
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*
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* The fun part of this story ends there. LibreSSL has an OPENSSL_VERSION_NUMBER macro, but they have set it to a
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* stupidly high value, version 2.0. OpenSSL version 2.0 does not exist, and LibreSSL 2.2 does not implement
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* everything OpenSSL 1.0.2 or 1.1.0 do. This completely breaks the entire purpose of the macro.
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*
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* The ifdef soup below is for LibreSSL compatibility. Please find whoever thought setting OPENSSL_VERSION_NUMBER
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* to a version that does not exist was a good idea. Encourage them to realise that it is not. -- amdj
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*/
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#if !defined(LIBRESSL_VERSION_NUMBER) && (OPENSSL_VERSION_NUMBER >= 0x10100000L)
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# define LRB_SSL_NO_EXPLICIT_INIT 1
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#endif
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#if !defined(LIBRESSL_VERSION_NUMBER) && (OPENSSL_VERSION_NUMBER >= 0x10002000L)
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# define LRB_HAVE_TLS_SET_CURVES 1
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# if (OPENSSL_VERSION_NUMBER < 0x10100000L)
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# define LRB_HAVE_TLS_ECDH_AUTO 1
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# endif
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#endif
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#if defined(LIBRESSL_VERSION_NUMBER) && (LIBRESSL_VERSION_NUMBER >= 0x20020002L)
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# define LRB_HAVE_TLS_METHOD_API 1
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#else
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# if !defined(LIBRESSL_VERSION_NUMBER) && (OPENSSL_VERSION_NUMBER >= 0x10100000L)
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# define LRB_HAVE_TLS_METHOD_API 1
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# endif
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#endif
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#if !defined(LIBRESSL_VERSION_NUMBER) && (OPENSSL_VERSION_NUMBER >= 0x10100000L)
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# define LRB_SSL_VTEXT_COMPILETIME OPENSSL_VERSION_TEXT
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# define LRB_SSL_VTEXT_RUNTIME OpenSSL_version(OPENSSL_VERSION)
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# define LRB_SSL_VNUM_COMPILETIME OPENSSL_VERSION_NUMBER
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# define LRB_SSL_VNUM_RUNTIME OpenSSL_version_num()
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# define LRB_SSL_FULL_VERSION_INFO 1
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#else
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# if defined(LIBRESSL_VERSION_NUMBER) && (LIBRESSL_VERSION_NUMBER >= 0x20200000L)
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# define LRB_SSL_VTEXT_RUNTIME SSLeay_version(SSLEAY_VERSION)
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# define LRB_SSL_VNUM_COMPILETIME LIBRESSL_VERSION_NUMBER
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# else
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# define LRB_SSL_VTEXT_RUNTIME SSLeay_version(SSLEAY_VERSION)
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# define LRB_SSL_VNUM_COMPILETIME SSLEAY_VERSION_NUMBER
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# endif
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#endif
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#if !defined(LIBRESSL_VERSION_NUMBER) && (OPENSSL_VERSION_NUMBER > 0x10101000L)
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# define LRB_HAVE_TLS_ECDH_X25519 1
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#else
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# if defined(LIBRESSL_VERSION_NUMBER) && (LIBRESSL_VERSION_NUMBER > 0x2050100fL)
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# define LRB_HAVE_TLS_ECDH_X25519 1
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# endif
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#endif
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#if !defined(LIBRESSL_VERSION_NUMBER) && (OPENSSL_VERSION_NUMBER >= 0x10101000L)
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# define LRB_HAVE_TLS13 1
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#endif
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/*
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* Default supported ciphersuites (if the user does not provide any) and
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* curves (OpenSSL 1.0.2+). Hardcoded secp384r1 (NIST P-384) is used on
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* OpenSSL 1.0.0 and 1.0.1 (if available).
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*
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* We prefer AEAD ciphersuites first in order of strength, then SHA2
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* ciphersuites, then remaining suites.
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*/
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static const char rb_default_ciphers[] = ""
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#ifdef LRB_HAVE_TLS13
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"TLS_AES_256_GCM_SHA384:"
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"TLS_CHACHA20_POLY1305_SHA256:"
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"TLS_AES_128_GCM_SHA256:"
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#endif
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"aECDSA+kEECDH+CHACHA20:"
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"aRSA+kEECDH+CHACHA20:"
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"aRSA+kEDH+CHACHA20:"
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"aECDSA+kEECDH+AESGCM:"
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"aRSA+kEECDH+AESGCM:"
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"aRSA+kEDH+AESGCM:"
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"aECDSA+kEECDH+AESCCM:"
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"aRSA+kEECDH+AESCCM:"
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"aRSA+kEDH+AESCCM:"
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"@STRENGTH:"
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"aECDSA+kEECDH+HIGH+SHA384:"
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"aRSA+kEECDH+HIGH+SHA384:"
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"aRSA+kEDH+HIGH+SHA384:"
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"aECDSA+kEECDH+HIGH+SHA256:"
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"aRSA+kEECDH+HIGH+SHA256:"
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"aRSA+kEDH+HIGH+SHA256:"
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"aECDSA+kEECDH+HIGH:"
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"aRSA+kEECDH+HIGH:"
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"aRSA+kEDH+HIGH:"
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"HIGH:"
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"!3DES:"
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"!aNULL";
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#ifdef LRB_HAVE_TLS_SET_CURVES
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# ifdef LRB_HAVE_TLS_ECDH_X25519
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static char rb_default_curves[] = "X25519:P-521:P-384:P-256";
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# else
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static char rb_default_curves[] = "P-521:P-384:P-256";
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# endif
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#endif
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#endif /* LRB_OPENSSL_H_INC */
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