upstream commit

add prohibit-password as a synonymn for without-password,
 since the without-password is causing too many questions.  Harden it to ban
 all but pubkey, hostbased, and GSSAPI auth (when the latter is enabled) from
 djm, ok markus

Upstream-ID: d53317d7b28942153e6236d3fd6e12ceb482db7a

auth.c

@@ -1,4 +1,4 @@
-/* $OpenBSD: auth.c,v 1.111 2015/05/01 04:17:51 djm Exp $ */
+/* $OpenBSD: auth.c,v 1.112 2015/08/06 14:53:21 deraadt Exp $ */
 /*
  * Copyright (c) 2000 Markus Friedl.  All rights reserved.
  *
@@ -352,7 +352,9 @@ auth_root_allowed(const char *method)
 	case PERMIT_YES:
 		return 1;
 	case PERMIT_NO_PASSWD:
-		if (strcmp(method, "password") != 0)
+		if (strcmp(method, "publickey") == 0 ||
+		    strcmp(method, "hostbased") == 0 ||
+		    strcmp(method, "gssapi-with-mic"))
 			return 1;
 		break;
 	case PERMIT_FORCED_ONLY:

servconf.c

@@ -1,5 +1,5 @@
 
-/* $OpenBSD: servconf.c,v 1.279 2015/07/31 15:38:09 chris Exp $ */
+/* $OpenBSD: servconf.c,v 1.280 2015/08/06 14:53:21 deraadt Exp $ */
 /*
  * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
  *                    All rights reserved
@@ -916,6 +916,7 @@ static const struct multistate multistate_addressfamily[] = {
 };
 static const struct multistate multistate_permitrootlogin[] = {
 	{ "without-password",		PERMIT_NO_PASSWD },
+	{ "prohibit-password",		PERMIT_NO_PASSWD },
 	{ "forced-commands-only",	PERMIT_FORCED_ONLY },
 	{ "yes",			PERMIT_YES },
 	{ "no",				PERMIT_NO },

sshd_config

@@ -1,4 +1,4 @@
-#	$OpenBSD: sshd_config,v 1.96 2015/07/30 19:23:02 deraadt Exp $
+#	$OpenBSD: sshd_config,v 1.97 2015/08/06 14:53:21 deraadt Exp $
 
 # This is the sshd server system-wide configuration file.  See
 # sshd_config(5) for more information.
@@ -41,7 +41,7 @@
 # Authentication:
 
 #LoginGraceTime 2m
-#PermitRootLogin without-password
+#PermitRootLogin prohibit-password
 #StrictModes yes
 #MaxAuthTries 6
 #MaxSessions 10

sshd_config.5

@@ -33,8 +33,8 @@
 .\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 .\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 .\"
-.\" $OpenBSD: sshd_config.5,v 1.209 2015/07/30 19:23:02 deraadt Exp $
-.Dd $Mdocdate: July 30 2015 $
+.\" $OpenBSD: sshd_config.5,v 1.210 2015/08/06 14:53:21 deraadt Exp $
+.Dd $Mdocdate: August 6 2015 $
 .Dt SSHD_CONFIG 5
 .Os
 .Sh NAME
@@ -1204,16 +1204,19 @@ Specifies whether root can log in using
 .Xr ssh 1 .
 The argument must be
 .Dq yes ,
+.Dq prohibit-password ,
 .Dq without-password ,
 .Dq forced-commands-only ,
 or
 .Dq no .
 The default is
-.Dq without-password .
+.Dq prohibit-password .
 .Pp
 If this option is set to
+.Dq prohibit-password
+or
 .Dq without-password ,
-password authentication is disabled for root.
+password and keyboard-interactive authentication are disabled for root.
 .Pp
 If this option is set to
 .Dq forced-commands-only ,