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upstream: client side of host-bound pubkey authentication

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Add kex->flags member to enable the publickey-hostbound-v00@openssh.com
authentication method.

Use the new hostbound method in client if the kex->flags flag was set,
and include the inital KEX hostkey in the userauth request.

Note: nothing in kex.c actually sets the new flag yet

ok markus@

OpenBSD-Commit-ID: 5a6fce8c6c8a77a80ee1526dc467d91036a5910d
This commit is contained in:
djm@openbsd.org 2021-12-19 22:12:54 +00:00 committed by Damien Miller
parent 288fd0218d
commit 94ae0c6f0e
2 changed files with 20 additions and 7 deletions
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8
kex.h
View File

@ -1,4 +1,4 @@
/* $OpenBSD: kex.h,v 1.115 2021/12/19 22:08:06 djm Exp $ */ /* $OpenBSD: kex.h,v 1.116 2021/12/19 22:12:54 djm Exp $ */
/* /*
* Copyright (c) 2000, 2001 Markus Friedl. All rights reserved. * Copyright (c) 2000, 2001 Markus Friedl. All rights reserved.
@ -105,8 +105,10 @@ enum kex_exchange {
KEX_MAX KEX_MAX
}; };
#define KEX_INIT_SENT 0x0001 /* kex->flags */
#define KEX_INITIAL 0x0002 #define KEX_INIT_SENT 0x0001
#define KEX_INITIAL 0x0002
#define KEX_HAS_PUBKEY_HOSTBOUND 0x0004
struct sshenc { struct sshenc {
char *name; char *name;

19
sshconnect2.c
View File

@ -1,4 +1,4 @@
/* $OpenBSD: sshconnect2.c,v 1.352 2021/12/19 22:08:48 djm Exp $ */ /* $OpenBSD: sshconnect2.c,v 1.353 2021/12/19 22:12:54 djm Exp $ */
/* /*
* Copyright (c) 2000 Markus Friedl. All rights reserved. * Copyright (c) 2000 Markus Friedl. All rights reserved.
* Copyright (c) 2008 Damien Miller. All rights reserved. * Copyright (c) 2008 Damien Miller. All rights reserved.
@ -1344,7 +1344,11 @@ sign_and_send_pubkey(struct ssh *ssh, Identity *id)
size_t slen = 0, skip = 0; size_t slen = 0, skip = 0;
int r, fallback_sigtype, sent = 0; int r, fallback_sigtype, sent = 0;
char *alg = NULL, *fp = NULL; char *alg = NULL, *fp = NULL;
const char *loc = ""; const char *loc = "", *method = "publickey";
/* prefer host-bound pubkey signatures if supported by server */
if ((ssh->kex->flags & KEX_HAS_PUBKEY_HOSTBOUND) != 0)
method = "publickey-hostbound-v00@openssh.com";
if ((fp = sshkey_fingerprint(id->key, options.fingerprint_hash, if ((fp = sshkey_fingerprint(id->key, options.fingerprint_hash,
SSH_FP_DEFAULT)) == NULL) SSH_FP_DEFAULT)) == NULL)
@ -1430,13 +1434,20 @@ sign_and_send_pubkey(struct ssh *ssh, Identity *id)
if ((r = sshbuf_put_u8(b, SSH2_MSG_USERAUTH_REQUEST)) != 0 || if ((r = sshbuf_put_u8(b, SSH2_MSG_USERAUTH_REQUEST)) != 0 ||
(r = sshbuf_put_cstring(b, authctxt->server_user)) != 0 || (r = sshbuf_put_cstring(b, authctxt->server_user)) != 0 ||
(r = sshbuf_put_cstring(b, authctxt->service)) != 0 || (r = sshbuf_put_cstring(b, authctxt->service)) != 0 ||
(r = sshbuf_put_cstring(b, authctxt->method->name)) != 0 || (r = sshbuf_put_cstring(b, method)) != 0 ||
(r = sshbuf_put_u8(b, 1)) != 0 || (r = sshbuf_put_u8(b, 1)) != 0 ||
(r = sshbuf_put_cstring(b, alg)) != 0 || (r = sshbuf_put_cstring(b, alg)) != 0 ||
(r = sshkey_puts(id->key, b)) != 0) { (r = sshkey_puts(id->key, b)) != 0) {
fatal_fr(r, "assemble signed data"); fatal_fr(r, "assemble signed data");
} }
if ((ssh->kex->flags & KEX_HAS_PUBKEY_HOSTBOUND) != 0) {
if (ssh->kex->initial_hostkey == NULL) {
fatal_f("internal error: initial hostkey "
"not recorded");
}
if ((r = sshkey_puts(ssh->kex->initial_hostkey, b)) != 0)
fatal_fr(r, "assemble %s hostkey", method);
}
/* generate signature */ /* generate signature */
r = identity_sign(sign_id, &signature, &slen, r = identity_sign(sign_id, &signature, &slen,
sshbuf_ptr(b), sshbuf_len(b), ssh->compat, alg); sshbuf_ptr(b), sshbuf_len(b), ssh->compat, alg);