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upstream: allow security keys to act as host keys as well as user
keys. Previously we didn't do this because we didn't want to expose the attack surface presented by USB and FIDO protocol handling, but now that this is insulated behind ssh-sk-helper there is less risk. ok markus@ OpenBSD-Commit-ID: 77b068dd133b8d87e0f010987bd5131e640ee64c
This commit is contained in:
djm@openbsd.org
Damien Miller
parent
5af6fd5461
commit
56584cce75
@ -1,4 +1,4 @@
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/* $OpenBSD: monitor.c,v 1.205 2019/11/25 10:23:36 djm Exp $ */
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/* $OpenBSD: monitor.c,v 1.206 2019/12/15 18:57:30 djm Exp $ */
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/*
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* Copyright 2002 Niels Provos <provos@citi.umich.edu>
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* Copyright 2002 Markus Friedl <markus@openbsd.org>
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@ -679,7 +679,7 @@ mm_answer_sign(struct ssh *ssh, int sock, struct sshbuf *m)
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if ((key = get_hostkey_by_index(keyid)) != NULL) {
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if ((r = sshkey_sign(key, &signature, &siglen, p, datlen, alg,
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NULL, compat)) != 0)
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options.sk_provider, compat)) != 0)
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fatal("%s: sshkey_sign failed: %s",
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__func__, ssh_err(r));
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} else if ((key = get_hostkey_public_by_index(keyid, ssh)) != NULL &&
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@ -1,4 +1,4 @@
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/* $OpenBSD: monitor_wrap.c,v 1.116 2019/11/25 00:51:37 djm Exp $ */
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/* $OpenBSD: monitor_wrap.c,v 1.117 2019/12/15 18:57:30 djm Exp $ */
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/*
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* Copyright 2002 Niels Provos <provos@citi.umich.edu>
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* Copyright 2002 Markus Friedl <markus@openbsd.org>
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@ -224,8 +224,6 @@ mm_sshkey_sign(struct ssh *ssh, struct sshkey *key, u_char **sigp, size_t *lenp,
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int r;
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debug3("%s entering", __func__);
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if (sk_provider != NULL)
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fatal("%s: sk_provider != NULL", __func__);
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if ((m = sshbuf_new()) == NULL)
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fatal("%s: sshbuf_new failed", __func__);
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if ((r = sshbuf_put_u32(m, ndx)) != 0 ||
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40
myproposal.h
40
myproposal.h
@ -1,4 +1,4 @@
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/* $OpenBSD: myproposal.h,v 1.62 2019/12/10 22:43:19 djm Exp $ */
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/* $OpenBSD: myproposal.h,v 1.63 2019/12/15 18:57:30 djm Exp $ */
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/*
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* Copyright (c) 2000 Markus Friedl. All rights reserved.
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@ -39,32 +39,30 @@
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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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"ecdsa-sha2-nistp521-cert-v01@openssh.com," \
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"sk-ecdsa-sha2-nistp256-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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"ecdsa-sha2-nistp521," \
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"sk-ecdsa-sha2-nistp256@openssh.com,"
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# else /* 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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# 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-nistp384-cert-v01@openssh.com," \
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"sk-ecdsa-sha2-nistp256-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 /* OPENSSL_HAS_NISTP521 */
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# define USERKEY_ECDSA_SK_CERT_METHODS \
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"sk-ecdsa-sha2-nistp256-cert-v01@openssh.com,"
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# define USERKEY_ECDSA_SK_METHODS \
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"ecdsa-sha2-nistp384," \
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"sk-ecdsa-sha2-nistp256@openssh.com,"
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# endif /* OPENSSL_HAS_NISTP521 */
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#else /* OPENSSL_HAS_ECC */
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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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# define USERKEY_ECDSA_SK_CERT_METHODS
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# define USERKEY_ECDSA_SK_METHODS
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#endif /* OPENSSL_HAS_ECC */
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#ifdef OPENSSL_HAVE_EVPGCM
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@ -110,11 +108,13 @@
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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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"sk-ssh-ed25519-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-rsa-cert-v01@openssh.com," \
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HOSTKEY_ECDSA_METHODS \
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"ssh-ed25519," \
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"sk-ssh-ed25519@openssh.com," \
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"rsa-sha2-512," \
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"rsa-sha2-256," \
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"ssh-rsa"
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@ -145,29 +145,12 @@
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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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HOSTKEY_ECDSA_METHODS \
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USERKEY_ECDSA_SK_METHODS \
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"ssh-ed25519," \
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"sk-ssh-ed25519@openssh.com," \
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"rsa-sha2-512," \
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"rsa-sha2-256," \
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"ssh-rsa"
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#define PUBKEY_DEFAULT_PK_ALG \
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USERKEY_ECDSA_SK_CERT_METHODS \
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HOSTKEY_ECDSA_CERT_METHODS \
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"sk-ssh-ed25519-cert-v01@openssh.com," \
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"ssh-ed25519-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-rsa-cert-v01@openssh.com," \
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USERKEY_ECDSA_SK_METHODS \
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HOSTKEY_ECDSA_METHODS \
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"sk-ssh-ed25519@openssh.com," \
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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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#else /* WITH_OPENSSL */
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#define KEX_SERVER_KEX \
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@ -176,7 +159,6 @@
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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 PUBKEY_DEFAULT_PK_ALG KEX_DEFAULT_PK_ALG
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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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@ -1,4 +1,4 @@
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/* $OpenBSD: readconf.c,v 1.314 2019/11/14 21:27:29 djm Exp $ */
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/* $OpenBSD: readconf.c,v 1.315 2019/12/15 18:57:30 djm Exp $ */
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/*
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* Author: Tatu Ylonen <ylo@cs.hut.fi>
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* Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
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@ -2153,7 +2153,7 @@ fill_default_options(Options * options)
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ASSEMBLE(macs, KEX_CLIENT_MAC, all_mac);
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ASSEMBLE(kex_algorithms, KEX_CLIENT_KEX, all_kex);
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ASSEMBLE(hostbased_key_types, KEX_DEFAULT_PK_ALG, all_key);
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ASSEMBLE(pubkey_key_types, PUBKEY_DEFAULT_PK_ALG, all_key);
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ASSEMBLE(pubkey_key_types, KEX_DEFAULT_PK_ALG, all_key);
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ASSEMBLE(ca_sign_algorithms, SSH_ALLOWED_CA_SIGALGS, all_sig);
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#undef ASSEMBLE
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free(all_cipher);
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18
servconf.c
18
servconf.c
@ -1,5 +1,5 @@
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/* $OpenBSD: servconf.c,v 1.354 2019/11/25 00:52:46 djm Exp $ */
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/* $OpenBSD: servconf.c,v 1.355 2019/12/15 18:57:30 djm Exp $ */
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/*
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* Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
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* All rights reserved
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@ -171,6 +171,7 @@ initialize_server_options(ServerOptions *options)
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options->authorized_keys_command = NULL;
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options->authorized_keys_command_user = NULL;
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options->revoked_keys_file = NULL;
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options->sk_provider = NULL;
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options->trusted_user_ca_keys = NULL;
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options->authorized_principals_file = NULL;
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options->authorized_principals_command = NULL;
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@ -211,7 +212,7 @@ assemble_algorithms(ServerOptions *o)
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ASSEMBLE(kex_algorithms, KEX_SERVER_KEX, all_kex);
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ASSEMBLE(hostkeyalgorithms, KEX_DEFAULT_PK_ALG, all_key);
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ASSEMBLE(hostbased_key_types, KEX_DEFAULT_PK_ALG, all_key);
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ASSEMBLE(pubkey_key_types, PUBKEY_DEFAULT_PK_ALG, all_key);
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ASSEMBLE(pubkey_key_types, KEX_DEFAULT_PK_ALG, all_key);
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ASSEMBLE(ca_sign_algorithms, SSH_ALLOWED_CA_SIGALGS, all_sig);
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#undef ASSEMBLE
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free(all_cipher);
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@ -428,6 +429,8 @@ fill_default_server_options(ServerOptions *options)
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options->disable_forwarding = 0;
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if (options->expose_userauth_info == -1)
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options->expose_userauth_info = 0;
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if (options->sk_provider == NULL)
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options->sk_provider = xstrdup("internal");
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assemble_algorithms(options);
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@ -447,6 +450,7 @@ fill_default_server_options(ServerOptions *options)
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CLEAR_ON_NONE(options->banner);
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CLEAR_ON_NONE(options->trusted_user_ca_keys);
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CLEAR_ON_NONE(options->revoked_keys_file);
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CLEAR_ON_NONE(options->sk_provider);
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CLEAR_ON_NONE(options->authorized_principals_file);
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CLEAR_ON_NONE(options->adm_forced_command);
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CLEAR_ON_NONE(options->chroot_directory);
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@ -512,7 +516,7 @@ typedef enum {
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sAuthenticationMethods, sHostKeyAgent, sPermitUserRC,
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sStreamLocalBindMask, sStreamLocalBindUnlink,
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sAllowStreamLocalForwarding, sFingerprintHash, sDisableForwarding,
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sExposeAuthInfo, sRDomain, sPubkeyAuthOptions,
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sExposeAuthInfo, sRDomain, sPubkeyAuthOptions, sSecurityKeyProvider,
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sDeprecated, sIgnore, sUnsupported
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} ServerOpCodes;
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@ -662,6 +666,7 @@ static struct {
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{ "exposeauthinfo", sExposeAuthInfo, SSHCFG_ALL },
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{ "rdomain", sRDomain, SSHCFG_ALL },
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{ "casignaturealgorithms", sCASignatureAlgorithms, SSHCFG_ALL },
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{ "securitykeyprovider", sSecurityKeyProvider, SSHCFG_GLOBAL },
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{ NULL, sBadOption, 0 }
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};
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@ -2025,6 +2030,10 @@ process_server_config_line(ServerOptions *options, char *line,
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charptr = &options->revoked_keys_file;
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goto parse_filename;
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case sSecurityKeyProvider:
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charptr = &options->sk_provider;
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goto parse_filename;
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case sIPQoS:
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arg = strdelim(&cp);
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if ((value = parse_ipqos(arg)) == -1)
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@ -2646,6 +2655,7 @@ dump_config(ServerOptions *o)
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dump_cfg_string(sChrootDirectory, o->chroot_directory);
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dump_cfg_string(sTrustedUserCAKeys, o->trusted_user_ca_keys);
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dump_cfg_string(sRevokedKeys, o->revoked_keys_file);
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dump_cfg_string(sSecurityKeyProvider, o->sk_provider);
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dump_cfg_string(sAuthorizedPrincipalsFile,
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o->authorized_principals_file);
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dump_cfg_string(sVersionAddendum, *o->version_addendum == '\0'
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@ -2664,7 +2674,7 @@ dump_config(ServerOptions *o)
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dump_cfg_string(sHostKeyAlgorithms, o->hostkeyalgorithms ?
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o->hostkeyalgorithms : KEX_DEFAULT_PK_ALG);
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dump_cfg_string(sPubkeyAcceptedKeyTypes, o->pubkey_key_types ?
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o->pubkey_key_types : PUBKEY_DEFAULT_PK_ALG);
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o->pubkey_key_types : KEX_DEFAULT_PK_ALG);
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dump_cfg_string(sRDomain, o->routing_domain);
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/* string arguments requiring a lookup */
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@ -1,4 +1,4 @@
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/* $OpenBSD: servconf.h,v 1.141 2019/11/25 00:52:46 djm Exp $ */
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/* $OpenBSD: servconf.h,v 1.142 2019/12/15 18:57:30 djm Exp $ */
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/*
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* Author: Tatu Ylonen <ylo@cs.hut.fi>
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@ -215,6 +215,7 @@ typedef struct {
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int fingerprint_hash;
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int expose_userauth_info;
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u_int64_t timing_secret;
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char *sk_provider;
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} ServerOptions;
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/* Information about the incoming connection as used by Match */
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42
sshd.c
42
sshd.c
@ -1,4 +1,4 @@
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/* $OpenBSD: sshd.c,v 1.541 2019/11/18 16:10:05 naddy Exp $ */
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/* $OpenBSD: sshd.c,v 1.542 2019/12/15 18:57:30 djm Exp $ */
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/*
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* Author: Tatu Ylonen <ylo@cs.hut.fi>
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* Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
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@ -122,6 +122,7 @@
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#include "auth-options.h"
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#include "version.h"
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#include "ssherr.h"
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#include "sk-api.h"
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/* Re-exec fds */
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#define REEXEC_DEVCRYPTO_RESERVED_FD (STDERR_FILENO + 1)
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@ -632,6 +633,8 @@ list_hostkey_types(void)
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case KEY_DSA:
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case KEY_ECDSA:
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case KEY_ED25519:
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case KEY_ECDSA_SK:
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case KEY_ED25519_SK:
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case KEY_XMSS:
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append_hostkey_type(b, sshkey_ssh_name(key));
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break;
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@ -651,6 +654,8 @@ list_hostkey_types(void)
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case KEY_DSA_CERT:
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case KEY_ECDSA_CERT:
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case KEY_ED25519_CERT:
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case KEY_ECDSA_SK_CERT:
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case KEY_ED25519_SK_CERT:
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case KEY_XMSS_CERT:
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append_hostkey_type(b, sshkey_ssh_name(key));
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break;
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@ -675,6 +680,8 @@ get_hostkey_by_type(int type, int nid, int need_private, struct ssh *ssh)
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case KEY_DSA_CERT:
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case KEY_ECDSA_CERT:
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case KEY_ED25519_CERT:
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case KEY_ECDSA_SK_CERT:
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case KEY_ED25519_SK_CERT:
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case KEY_XMSS_CERT:
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key = sensitive_data.host_certificates[i];
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break;
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@ -684,10 +691,20 @@ get_hostkey_by_type(int type, int nid, int need_private, struct ssh *ssh)
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key = sensitive_data.host_pubkeys[i];
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break;
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}
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if (key != NULL && key->type == type &&
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(key->type != KEY_ECDSA || key->ecdsa_nid == nid))
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if (key == NULL || key->type != type)
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continue;
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switch (type) {
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case KEY_ECDSA:
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case KEY_ECDSA_SK:
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case KEY_ECDSA_CERT:
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case KEY_ECDSA_SK_CERT:
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if (key->ecdsa_nid != nid)
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continue;
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/* FALLTHROUGH */
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default:
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return need_private ?
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sensitive_data.host_keys[i] : key;
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}
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}
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return NULL;
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}
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@ -1723,7 +1740,14 @@ main(int ac, char **av)
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&key, NULL)) != 0 && r != SSH_ERR_SYSTEM_ERROR)
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do_log2(ll, "Unable to load host key \"%s\": %s",
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options.host_key_files[i], ssh_err(r));
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if (r == 0 && (r = sshkey_shield_private(key)) != 0) {
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if (sshkey_is_sk(key) &&
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key->sk_flags & SSH_SK_USER_PRESENCE_REQD) {
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debug("host key %s requires user presence, ignoring",
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options.host_key_files[i]);
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key->sk_flags &= ~SSH_SK_USER_PRESENCE_REQD;
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}
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if (r == 0 && key != NULL &&
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(r = sshkey_shield_private(key)) != 0) {
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do_log2(ll, "Unable to shield host key \"%s\": %s",
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options.host_key_files[i], ssh_err(r));
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sshkey_free(key);
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@ -1760,6 +1784,8 @@ main(int ac, char **av)
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case KEY_DSA:
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case KEY_ECDSA:
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case KEY_ED25519:
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case KEY_ECDSA_SK:
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case KEY_ED25519_SK:
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case KEY_XMSS:
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if (have_agent || key != NULL)
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sensitive_data.have_ssh2_key = 1;
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@ -2212,17 +2238,19 @@ sshd_hostkey_sign(struct ssh *ssh, struct sshkey *privkey,
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if (use_privsep) {
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if (privkey) {
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if (mm_sshkey_sign(ssh, privkey, signature, slenp,
|
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data, dlen, alg, NULL, ssh->compat) < 0)
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data, dlen, alg, options.sk_provider,
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ssh->compat) < 0)
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fatal("%s: privkey sign failed", __func__);
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} else {
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if (mm_sshkey_sign(ssh, pubkey, signature, slenp,
|
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data, dlen, alg, NULL, ssh->compat) < 0)
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data, dlen, alg, options.sk_provider,
|
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ssh->compat) < 0)
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fatal("%s: pubkey sign failed", __func__);
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}
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} else {
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if (privkey) {
|
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if (sshkey_sign(privkey, signature, slenp, data, dlen,
|
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alg, NULL, ssh->compat) < 0)
|
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alg, options.sk_provider, ssh->compat) < 0)
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fatal("%s: privkey sign failed", __func__);
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} else {
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if ((r = ssh_agent_sign(auth_sock, pubkey,
|
||||
|
||||
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Reference in New Issue
Block a user