No need for group, forced sftp

Dockerfile

@@ -4,7 +4,6 @@ MAINTAINER Adrian Dvergsdal
 RUN apt-get update && DEBIAN_FRONTEND=noninteractive apt-get -y install openssh-server
 
 RUN mkdir -p /var/run/sshd
-RUN addgroup --system sftp
 
 ADD . /root
 WORKDIR /root

run

@@ -7,11 +7,11 @@ for userData in "${users[@]}"; do
     user="${data[0]}"
     pass="${data[1]}"
 
-    useradd -G sftp $user
+    useradd $user
     echo "$user:$pass" | chpasswd
     chown root:root /home/$user
     chmod 755 /home/$user
-    chown -R $user:sftp /home/$user/*
+    chown -R $user:users /home/$user/*
 done
 
 # Run SSH

sshd_config

@@ -1,9 +1,5 @@
 PermitRootLogin no
-#ChallengeResponseAuthentication no
-UsePAM no
 Subsystem sftp internal-sftp
-
-Match group sftp
 ChrootDirectory %h
 X11Forwarding no
 AllowTcpForwarding no