0

I am able to successfully setup a SFTP user group and SFTP users using the below script on an AWS EC2 instance. While I was able to restrict SFTP users in the sftp_users group from accessing one other's directories and their contents, I now need to be able to create a admin SFTP user who can access and browse through all the contents for all SFTP folders and move stuff around. Is this possible? Like I have stated, my requirement would be to create individual SFTP users with access to ONLY their individual folders and to create a admin / super user who can access all the users sftp folders via SFTP. It is okay if the admin user has access to all file system along with SFTP users folders. I tried researching online with my limited linux skills in this context, but could not arrive at anything.

echo "`date` Creating SFTP directory...."
mkdir -p /data/sftp

echo "`date` updating sshd_config"
sed -i 's/PasswordAuthentication no/PasswordAuthentication yes/' /etc/ssh/sshd_config
echo 'Match Group sftp_users' >> /etc/ssh/sshd_config
echo 'ChrootDirectory /data/sftp' >> /etc/ssh/sshd_config
echo 'ForceCommand internal-sftp' >> /etc/ssh/sshd_config

echo "`date` Set permissions to 701 for all folders on the efs mount"
chmod -R 701 /data

echo "`date` Set owner to root:root for all folders on the efs mount"
chown -R root:root /data

echo "`date` adding sft_users group"
groupadd sftp_users

echo "`date` restarting sshd"
systemctl restart sshd

###### Below is my user creation script that I eventually use to create individual SFTP users ######
echo "`date` creating /usr/local/bin/create_sftp_user.sh"
echo -e '#!/bin/bash\n\nUSER_NAME=$1\nuseradd -g sftp_users -d /$USER_NAME -s /sbin/nologin $USER_NAME\n' > /usr/local/sbin/create_sftp_user.sh
echo -e 'passwd $USER_NAME\nmkdir -p /data/sftp/$USER_NAME\n' >> /usr/local/sbin/create_sftp_user.sh
echo -e 'chown $USER_NAME:sftp_users /data/sftp/$USER_NAME\n' >> /usr/local/sbin/create_sftp_user.sh
echo -e 'chmod 700 /data/sftp/$USER_NAME\n' >> /usr/local/sbin/create_sftp_user.sh
chmod +x /usr/local/sbin/create_sftp_user.sh
0

You should be able to achieve this by using File Access Control Lists (FACLs). You could, for example create a group "sftpadmin" that only the admin user is a member of, then force all files in /data/sftp to be owned (and writable) by group "sftpadmin".

How to use FACLs is covered on the Unix & Linux StackExchange: https://unix.stackexchange.com/questions/165865/forcing-owner-on-created-files-and-folders/165986#165986

  • is there an example that could help me? I am a linux noob and any reference that you could provide could possibly help. thanks. – Satya Apr 3 at 19:28

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.