openssh: Introduce include directory for additional sshd config files

This patch adds the prosibility to place additional *.config files in /etc/ssh/sshd_config.d/
which will be included and loaded during the daemon startup process.

Because this files will not be overwritten by any update, they can be used to place custom
or other persistent settings.

Signed-off-by: Stefan Schantl <stefan.schantl@ipfire.org>
Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>

config/rootfiles/common/openssh

@@ -8,6 +8,7 @@ etc/ssh/ssh_config
 #etc/ssh/ssh_host_rsa_key
 #etc/ssh/ssh_host_rsa_key.pub
 etc/ssh/sshd_config
+etc/ssh/sshd_config.d
 usr/bin/scp
 usr/bin/sftp
 usr/bin/ssh

config/ssh/sshd_config

@@ -57,4 +57,7 @@ TCPKeepAlive no
 # Add support for SFTP
 Subsystem	sftp	/usr/lib/openssh/sftp-server
 
+# Include additional sshd config files.
+Include /etc/ssh/sshd_config.d/*.conf
+
 # EOF

lfs/openssh

@@ -91,5 +91,9 @@ $(TARGET) : $(patsubst %,$(DIR_DL)/%,$(objects))
 	install -v -m 644 $(DIR_SRC)/config/ssh/ssh_config \
 		/etc/ssh/ssh_config
 
+	# Create directory for additional config
+	# config files.
+	mkdir -pv /etc/ssh/sshd_config.d/
+
 	@rm -rf $(DIR_APP)
 	@$(POSTBUILD)