sshd_config: Add.

diff --git a/sshd_config b/sshd_config
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+++ b/sshd_config
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+# SSH daemon configuration file.
+#
+# Some options are set even if they are default to document that they are
+# important and to prevent upstream changes from affecting them.
+
+# Copyright (C) 2013  Simon Ruderich
+#
+# This file is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This file is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this file.  If not, see <http://www.gnu.org/licenses/>.
+
+
+# Listen on port 22 (default).
+Port 22
+
+# Only use protocol 2. Protocol 1 is insecure. (default)
+Protocol 2
+
+# Use privilege separation for increased security.
+UsePrivilegeSeparation yes
+
+# Don't use PAM because it may circumvent other authentication methods used
+# below (default).
+UsePAM no
+# Disable authentication methods I don't use.
+ChallengeResponseAuthentication no
+GSSAPIAuthentication no
+HostbasedAuthentication no
+KerberosAuthentication no
+PasswordAuthentication no
+# Only enable those I need.
+PubkeyAuthentication yes
+
+# Don't allow empty passwords (default).
+PermitEmptyPasswords no
+# Allow root-login only with public keys.
+PermitRootLogin without-password
+
+# Be strict when checking user file permissions (default).
+StrictModes yes
+
+# Don't accept any environment variables from the client (default).
+AcceptEnv
+# Don't use ~/.ssh/environment and environment= options in
+# ~/.ssh/authorized_keys because LD_PRELOAD could be used to circumvent
+# authentications (default).
+PermitUserEnvironment no
+
+
+# Only allow logins for certain users.
+AllowUsers root