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| In this post, I'll show you how to set up secure ftp (SFTP) access to your Ubuntu server. (Instructions for Debian are very similar: leave out the sudo part and follow these steps as root:)
| | Something I've wanted to do for quite some time and now that I'm building an Ubuntu server to replace my Fedora Core attic server, now was a good time to look into this. |
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| For this to work, you'll need Ubuntu 8.10 "Intrepid", Debian 5.0 "Lenny" or newer. In this example, mark is the user that can gain superuser rights through sudo. "peter" and a few other users are the ones I want to give sftp access to their personal folder, but not shell access or anything else.
| | http://wiki.tony-su.com/How_to_restrict_sftp_user_in_Ubuntu |
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| Step 1: If it doesn't exist yet, create a group for the users you want to have sftp access only:
| | See page history if link is down. |
| <pre>
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| sudo groupadd sftponly
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| </pre>
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| Step 2: Add user "peter" to this group:
| | [[Category:Linux]] |
| <pre>
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| sudo adduser peter sftponly
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| </pre>
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| Step 3: Install openssh-server if it's not installed yet.
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| <pre>
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| sudo apt-get install openssh-server
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| </pre>
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| Step 4: Open the default OpenSSH server configuration for editing:
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| <pre>
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| sudo nano /etc/ssh/sshd_config
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| </pre>
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| Step 5: Change the default sftp server from:
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| <pre>
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| Subsystem sftp /usr/lib/openssh/sftp-server
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| </pre>
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| to
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| <pre>
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| Subsystem sftp internal-sftp
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| </pre>
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| Step 6: Some users can only use sftp, but not other OpenSSH features like remote login. Let's create a rule for that group of users (we'll create the group afterwards). Add the following section to the bottom of /etc/ssh/sshd_config:
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| <pre>
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| Match group sftponly
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| ChrootDirectory /home/%u
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| X11Forwarding no
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| AllowTcpForwarding no
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| ForceCommand internal-sftp
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| </pre>
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| Step 7: Pass ownership of peter's directory you want to be sftp accessible to the superuser:
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| <pre>
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| sudo chown root.root /home/peter
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| </pre>
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| Step 8: Now we change peter's home directory (normally /home/peter) to /:
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| <pre>
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| sudo usermod -d / peter
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| </pre>
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| Step 9: Repeat steps 2, 7 and 8 for any other users that you want to give sftp access.
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| Step 10: restart sshd
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| <pre>
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| sudo /etc/init.d/ssh restart
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| </pre>
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| Note: to disable the sftp user to use ssh login, change to
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| <pre>
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| sudo usermod -s=/bin/false username
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| </pre>
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| reference: http://blog.markvdb.be/2009/01/sftp-on-ubuntu-and-debian-in-9-easy.html
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