From 4ba0d54794814ec0de1ec87987d0c3b89379b436 Mon Sep 17 00:00:00 2001 From: "djm@openbsd.org" Date: Tue, 3 Jul 2018 11:39:54 +0000 Subject: upstream: Improve strictness and control over RSA-SHA2 signature In ssh, when an agent fails to return a RSA-SHA2 signature when requested and falls back to RSA-SHA1 instead, retry the signature to ensure that the public key algorithm sent in the SSH_MSG_USERAUTH matches the one in the signature itself. In sshd, strictly enforce that the public key algorithm sent in the SSH_MSG_USERAUTH message matches what appears in the signature. Make the sshd_config PubkeyAcceptedKeyTypes and HostbasedAcceptedKeyTypes options control accepted signature algorithms (previously they selected supported key types). This allows these options to ban RSA-SHA1 in favour of RSA-SHA2. Add new signature algorithms "rsa-sha2-256-cert-v01@openssh.com" and "rsa-sha2-512-cert-v01@openssh.com" to force use of RSA-SHA2 signatures with certificate keys. feedback and ok markus@ OpenBSD-Commit-ID: c6e9f6d45eed8962ad502d315d7eaef32c419dde --- myproposal.h | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) (limited to 'myproposal.h') diff --git a/myproposal.h b/myproposal.h index c255147a..08782dd3 100644 --- a/myproposal.h +++ b/myproposal.h @@ -1,4 +1,4 @@ -/* $OpenBSD: myproposal.h,v 1.55 2017/05/07 23:13:42 djm Exp $ */ +/* $OpenBSD: myproposal.h,v 1.56 2018/07/03 11:39:54 djm Exp $ */ /* * Copyright (c) 2000 Markus Friedl. All rights reserved. @@ -107,6 +107,8 @@ #define KEX_DEFAULT_PK_ALG \ HOSTKEY_ECDSA_CERT_METHODS \ "ssh-ed25519-cert-v01@openssh.com," \ + "rsa-sha2-512-cert-v01@openssh.com," \ + "rsa-sha2-256-cert-v01@openssh.com," \ "ssh-rsa-cert-v01@openssh.com," \ HOSTKEY_ECDSA_METHODS \ "ssh-ed25519," \ -- cgit v1.2.1