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upstream: EXT_INFO negotiation of hostbound pubkey auth

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the EXT_INFO packet gets a new publickey-hostbound@openssh.com to
advertise the hostbound public key method.

Client side support to parse this feature flag and set the kex->flags
indicator if the expected version is offered (currently "0").

ok markus@

OpenBSD-Commit-ID: 4cdb2ca5017ec1ed7a9d33bda95c1d6a97b583b0
This commit is contained in:
djm@openbsd.org 2021-12-19 22:13:12 +00:00 committed by Damien Miller
parent 94ae0c6f0e
commit 3e16365a79
1 changed files with 20 additions and 2 deletions
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22
kex.c
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@ -1,4 +1,4 @@
/* $OpenBSD: kex.c,v 1.169 2021/12/19 22:08:06 djm Exp $ */
/* $OpenBSD: kex.c,v 1.170 2021/12/19 22:13:12 djm Exp $ */
/*
* Copyright (c) 2000, 2001 Markus Friedl. All rights reserved.
*
@ -436,9 +436,12 @@ kex_send_ext_info(struct ssh *ssh)
return SSH_ERR_ALLOC_FAIL;
/* XXX filter algs list by allowed pubkey/hostbased types */
if ((r = sshpkt_start(ssh, SSH2_MSG_EXT_INFO)) != 0 ||
(r = sshpkt_put_u32(ssh, 1)) != 0 ||
(r = sshpkt_put_u32(ssh, 2)) != 0 ||
(r = sshpkt_put_cstring(ssh, "server-sig-algs")) != 0 ||
(r = sshpkt_put_cstring(ssh, algs)) != 0 ||
(r = sshpkt_put_cstring(ssh,
"publickey-hostbound@openssh.com")) != 0 ||
(r = sshpkt_put_cstring(ssh, "0")) != 0 ||
(r = sshpkt_send(ssh)) != 0) {
error_fr(r, "compose");
goto out;
@ -498,6 +501,21 @@ kex_input_ext_info(int type, u_int32_t seq, struct ssh *ssh)
debug_f("%s=<%s>", name, val);
kex->server_sig_algs = val;
val = NULL;
} else if (strcmp(name,
"publickey-hostbound@openssh.com") == 0) {
/* XXX refactor */
/* Ensure no \0 lurking in value */
if (memchr(val, '\0', vlen) != NULL) {
error_f("nul byte in %s", name);
return SSH_ERR_INVALID_FORMAT;
}
debug_f("%s=<%s>", name, val);
if (strcmp(val, "0") == 0)
kex->flags |= KEX_HAS_PUBKEY_HOSTBOUND;
else {
debug_f("unsupported version of %s extension",
name);
}
} else
debug_f("%s (unrecognised)", name);
free(name);