Add sftp jail.

ansible/roles/sftp/files/sshd_config

@@ -0,0 +1,17 @@
+# The default is to check both .ssh/authorized_keys and .ssh/authorized_keys2
+# but this is overridden so installations will only check .ssh/authorized_keys
+AuthorizedKeysFile	.ssh/authorized_keys
+
+# Only allow sftp users
+AllowUsers nochainstounlock
+ChrootDirectory /chroot
+
+# override default of no subsystems
+Subsystem	sftp	/usr/libexec/sftp-server
+
+# Example of overriding settings on a per-user basis
+Match User nochainstounlock
+	X11Forwarding no
+	AllowTcpForwarding no
+	PermitTTY no
+        ForceCommand internal-sftp