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0082fba4ef
Remove support for pre-authentication compression. Doing compression early in the protocol probably seemed reasonable in the 1990s, but today it's clearly a bad idea in terms of both cryptography (cf. multiple compression oracle attacks in TLS) and attack surface. Moreover, to support it across privilege-separation zlib needed the assistance of a complex shared-memory manager that made the required attack surface considerably larger. Prompted by Guido Vranken pointing out a compiler-elided security check in the shared memory manager found by Stack (http://css.csail.mit.edu/stack/); ok deraadt@ markus@ NB. pre-auth authentication has been disabled by default in sshd for >10 years. Upstream-ID: 32af9771788d45a0779693b41d06ec199d849caf
197 lines
5.3 KiB
C
197 lines
5.3 KiB
C
/* $OpenBSD: myproposal.h,v 1.54 2016/09/28 16:33:07 djm Exp $ */
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/*
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* Copyright (c) 2000 Markus Friedl. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <openssl/opensslv.h>
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/* conditional algorithm support */
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#ifdef OPENSSL_HAS_ECC
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#ifdef OPENSSL_HAS_NISTP521
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# define KEX_ECDH_METHODS \
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"ecdh-sha2-nistp256," \
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"ecdh-sha2-nistp384," \
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"ecdh-sha2-nistp521,"
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# define HOSTKEY_ECDSA_CERT_METHODS \
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"ecdsa-sha2-nistp256-cert-v01@openssh.com," \
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"ecdsa-sha2-nistp384-cert-v01@openssh.com," \
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"ecdsa-sha2-nistp521-cert-v01@openssh.com,"
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# define HOSTKEY_ECDSA_METHODS \
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"ecdsa-sha2-nistp256," \
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"ecdsa-sha2-nistp384," \
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"ecdsa-sha2-nistp521,"
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#else
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# define KEX_ECDH_METHODS \
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"ecdh-sha2-nistp256," \
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"ecdh-sha2-nistp384,"
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# define HOSTKEY_ECDSA_CERT_METHODS \
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"ecdsa-sha2-nistp256-cert-v01@openssh.com," \
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"ecdsa-sha2-nistp384-cert-v01@openssh.com,"
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# define HOSTKEY_ECDSA_METHODS \
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"ecdsa-sha2-nistp256," \
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"ecdsa-sha2-nistp384,"
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#endif
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#else
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# define KEX_ECDH_METHODS
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# define HOSTKEY_ECDSA_CERT_METHODS
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# define HOSTKEY_ECDSA_METHODS
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#endif
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#ifdef OPENSSL_HAVE_EVPGCM
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# define AESGCM_CIPHER_MODES \
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",aes128-gcm@openssh.com,aes256-gcm@openssh.com"
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#else
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# define AESGCM_CIPHER_MODES
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#endif
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#ifdef HAVE_EVP_SHA256
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# define KEX_SHA2_METHODS \
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"diffie-hellman-group-exchange-sha256," \
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"diffie-hellman-group16-sha512," \
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"diffie-hellman-group18-sha512,"
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# define KEX_SHA2_GROUP14 \
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"diffie-hellman-group14-sha256,"
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#define SHA2_HMAC_MODES \
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"hmac-sha2-256," \
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"hmac-sha2-512,"
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#else
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# define KEX_SHA2_METHODS
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# define KEX_SHA2_GROUP14
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# define SHA2_HMAC_MODES
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#endif
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#ifdef WITH_OPENSSL
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# ifdef HAVE_EVP_SHA256
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# define KEX_CURVE25519_METHODS \
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"curve25519-sha256," \
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"curve25519-sha256@libssh.org,"
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# else
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# define KEX_CURVE25519_METHODS ""
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# endif
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#define KEX_COMMON_KEX \
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KEX_CURVE25519_METHODS \
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KEX_ECDH_METHODS \
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KEX_SHA2_METHODS
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#define KEX_SERVER_KEX KEX_COMMON_KEX \
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KEX_SHA2_GROUP14 \
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"diffie-hellman-group14-sha1" \
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#define KEX_CLIENT_KEX KEX_COMMON_KEX \
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"diffie-hellman-group-exchange-sha1," \
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KEX_SHA2_GROUP14 \
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"diffie-hellman-group14-sha1"
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#define KEX_DEFAULT_PK_ALG \
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HOSTKEY_ECDSA_CERT_METHODS \
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"ssh-ed25519-cert-v01@openssh.com," \
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"ssh-rsa-cert-v01@openssh.com," \
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HOSTKEY_ECDSA_METHODS \
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"ssh-ed25519," \
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"rsa-sha2-512," \
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"rsa-sha2-256," \
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"ssh-rsa"
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/* the actual algorithms */
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#define KEX_SERVER_ENCRYPT \
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"chacha20-poly1305@openssh.com," \
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"aes128-ctr,aes192-ctr,aes256-ctr" \
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AESGCM_CIPHER_MODES
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#define KEX_CLIENT_ENCRYPT KEX_SERVER_ENCRYPT "," \
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"aes128-cbc,aes192-cbc,aes256-cbc"
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#define KEX_SERVER_MAC \
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"umac-64-etm@openssh.com," \
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"umac-128-etm@openssh.com," \
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"hmac-sha2-256-etm@openssh.com," \
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"hmac-sha2-512-etm@openssh.com," \
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"hmac-sha1-etm@openssh.com," \
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"umac-64@openssh.com," \
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"umac-128@openssh.com," \
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"hmac-sha2-256," \
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"hmac-sha2-512," \
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"hmac-sha1"
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#define KEX_CLIENT_MAC KEX_SERVER_MAC
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#else /* WITH_OPENSSL */
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#define KEX_SERVER_KEX \
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"curve25519-sha256," \
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"curve25519-sha256@libssh.org"
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#define KEX_DEFAULT_PK_ALG \
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"ssh-ed25519-cert-v01@openssh.com," \
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"ssh-ed25519"
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#define KEX_SERVER_ENCRYPT \
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"chacha20-poly1305@openssh.com," \
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"aes128-ctr,aes192-ctr,aes256-ctr"
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#define KEX_SERVER_MAC \
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"umac-64-etm@openssh.com," \
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"umac-128-etm@openssh.com," \
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"hmac-sha2-256-etm@openssh.com," \
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"hmac-sha2-512-etm@openssh.com," \
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"hmac-sha1-etm@openssh.com," \
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"umac-64@openssh.com," \
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"umac-128@openssh.com," \
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"hmac-sha2-256," \
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"hmac-sha2-512," \
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"hmac-sha1"
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#define KEX_CLIENT_KEX KEX_SERVER_KEX
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#define KEX_CLIENT_ENCRYPT KEX_SERVER_ENCRYPT
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#define KEX_CLIENT_MAC KEX_SERVER_MAC
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#endif /* WITH_OPENSSL */
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#define KEX_DEFAULT_COMP "none,zlib@openssh.com"
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#define KEX_DEFAULT_LANG ""
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#define KEX_CLIENT \
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KEX_CLIENT_KEX, \
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KEX_DEFAULT_PK_ALG, \
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KEX_CLIENT_ENCRYPT, \
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KEX_CLIENT_ENCRYPT, \
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KEX_CLIENT_MAC, \
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KEX_CLIENT_MAC, \
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KEX_DEFAULT_COMP, \
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KEX_DEFAULT_COMP, \
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KEX_DEFAULT_LANG, \
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KEX_DEFAULT_LANG
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#define KEX_SERVER \
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KEX_SERVER_KEX, \
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KEX_DEFAULT_PK_ALG, \
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KEX_SERVER_ENCRYPT, \
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KEX_SERVER_ENCRYPT, \
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KEX_SERVER_MAC, \
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KEX_SERVER_MAC, \
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KEX_DEFAULT_COMP, \
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KEX_DEFAULT_COMP, \
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KEX_DEFAULT_LANG, \
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KEX_DEFAULT_LANG
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