fix: Adapt SFTP config to old OpenSSH

To make it work with Brother ADS-2400N scanner

images/nextcloud/docker-entrypoint.sh

@@ -39,6 +39,7 @@ fi
 
 function check_result {
     if [ $1 != 0 ]; then
+        echo "";
         echo "Error $1: $2";
         exit 1;
     fi

images/sftp/docker-entrypoint.sh

@@ -19,6 +19,14 @@ fi
 sed -i 's/#HostKey \/etc\/ssh\/ssh_host_rsa_key/HostKey \/etc\/ssh\/ssh_host_rsa_key/g' /etc/ssh/sshd_config
 echo "HostKeyAlgorithms ssh-rsa" >> /etc/ssh/sshd_config
 
+# https://www.leonardw.de/en/blog/brother-ads-2400n-paperless-ngx/
+# Force old algorithms that the scanner (OpenSSH 6.0) understands
+echo "KexAlgorithms diffie-hellman-group14-sha1" >> /etc/ssh/sshd_config
+echo "Ciphers aes128-cbc,aes256-cbc,3des-cbc" >> /etc/ssh/sshd_config
+echo "MACs hmac-sha1" >> /etc/ssh/sshd_config
+echo "HostKeyAlgorithms +ssh-rsa" >> /etc/ssh/sshd_config
+echo "PubkeyAcceptedAlgorithms +ssh-rsa" >> /etc/ssh/sshd_config
+
 # https://bugs.launchpad.net/ubuntu/+source/openssh/+bug/45234
 mkdir -p /var/run/sshd