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signature algorithm by default. It is feasible to create colliding SHA1 hashes, so we need to deprecate its use. RSA/SHA-256/512 remains available and will be transparently selected instead of RSA/SHA1 for most SSH servers released in the last five+ years. There is no need to regenerate RSA keys. The use of RSA/SHA1 can be re-enabled by adding "ssh-rsa" to the PubkeyAcceptedAlgorithms directives on the client and server. ok dtucker deraadt OpenBSD-Commit-ID: 189bcc4789c7254e09e23734bdd5def8354ff1d5
116 lines
3.6 KiB
C
116 lines
3.6 KiB
C
/* $OpenBSD: myproposal.h,v 1.69 2021/08/29 23:53:10 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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#define KEX_SERVER_KEX \
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"curve25519-sha256," \
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"curve25519-sha256@libssh.org," \
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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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"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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"diffie-hellman-group14-sha256"
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#define KEX_CLIENT_KEX KEX_SERVER_KEX
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#define KEX_DEFAULT_PK_ALG \
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"ssh-ed25519-cert-v01@openssh.com," \
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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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"sk-ssh-ed25519-cert-v01@openssh.com," \
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"sk-ecdsa-sha2-nistp256-cert-v01@openssh.com," \
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"rsa-sha2-512-cert-v01@openssh.com," \
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"rsa-sha2-256-cert-v01@openssh.com," \
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"ssh-ed25519," \
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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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"sk-ssh-ed25519@openssh.com," \
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"sk-ecdsa-sha2-nistp256@openssh.com," \
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"rsa-sha2-512," \
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"rsa-sha2-256"
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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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"aes128-gcm@openssh.com,aes256-gcm@openssh.com"
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#define KEX_CLIENT_ENCRYPT KEX_SERVER_ENCRYPT
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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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/* Not a KEX value, but here so all the algorithm defaults are together */
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#define SSH_ALLOWED_CA_SIGALGS \
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"ssh-ed25519," \
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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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"sk-ssh-ed25519@openssh.com," \
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"sk-ecdsa-sha2-nistp256@openssh.com," \
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"rsa-sha2-512," \
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"rsa-sha2-256"
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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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