upstream: make ssh hostbased authentication send the signature

algorithm in its SSH2_MSG_USERAUTH_REQUEST packets instead of the key type.
This make HostbasedAcceptedAlgorithms do what it is supposed to - filter on
signature algorithm and not key type.

spotted with dtucker@ ok markus@

OpenBSD-Commit-ID: 25bffe19f0326972f5728170f7da81d5f45c78c6

sshconnect2.c

@@ -1,4 +1,4 @@
-/* $OpenBSD: sshconnect2.c,v 1.342 2021/01/22 02:44:58 dtucker Exp $ */
+/* $OpenBSD: sshconnect2.c,v 1.343 2021/01/25 06:00:17 djm Exp $ */
 /*
  * Copyright (c) 2000 Markus Friedl.  All rights reserved.
  * Copyright (c) 2008 Damien Miller.  All rights reserved.
@@ -2177,7 +2177,7 @@ userauth_hostbased(struct ssh *ssh)
 	    (r = sshbuf_put_cstring(b, authctxt->server_user)) != 0 ||
 	    (r = sshbuf_put_cstring(b, authctxt->service)) != 0 ||
 	    (r = sshbuf_put_cstring(b, authctxt->method->name)) != 0 ||
-	    (r = sshbuf_put_cstring(b, sshkey_ssh_name(private))) != 0 ||
+	    (r = sshbuf_put_cstring(b, authctxt->active_ktype)) != 0 ||
 	    (r = sshbuf_put_string(b, keyblob, keylen)) != 0 ||
 	    (r = sshbuf_put_cstring(b, chost)) != 0 ||
 	    (r = sshbuf_put_cstring(b, authctxt->local_user)) != 0) {
@@ -2198,7 +2198,7 @@ userauth_hostbased(struct ssh *ssh)
 	    (r = sshpkt_put_cstring(ssh, authctxt->server_user)) != 0 ||
 	    (r = sshpkt_put_cstring(ssh, authctxt->service)) != 0 ||
 	    (r = sshpkt_put_cstring(ssh, authctxt->method->name)) != 0 ||
-	    (r = sshpkt_put_cstring(ssh, sshkey_ssh_name(private))) != 0 ||
+	    (r = sshpkt_put_cstring(ssh, authctxt->active_ktype)) != 0 ||
 	    (r = sshpkt_put_string(ssh, keyblob, keylen)) != 0 ||
 	    (r = sshpkt_put_cstring(ssh, chost)) != 0 ||
 	    (r = sshpkt_put_cstring(ssh, authctxt->local_user)) != 0 ||