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Knowledge Base

SFTP does not restrict user to the subscription’s directory

 
backupcentoschrootdebiandomains

Symptoms

  • /bin/bash (chrooted) is selected as a shell in Plesk > Domains > example.com > Access to the server over SSH

  • The restriction to the /var/www/vhosts/example.com is active in the SSH session:

    # ssh [email protected]
    bash-4.2$ echo -n 'SFTP restrictions '; [[ -e /httpdocs ]] && echo 'active' || echo 'inactive'
    SFTP restrictions active

  • The restriction is not active in the SFTP (it is possible to traverse to the real root):

    border_plus_2018-05-30_05_06_58-sftp___sitebuilder_10.39.81.93_-_FileZilla.png

Cause

Subsystem sftp is set to the external-sftp in the SSHD configuration:

# grep sftp /etc/ssh/sshd_config | grep -v '^#'
Subsystem sftp external-sftp

Note: internal-sftp is not compatible with the Plesk chrooted shell configuration for SFTP.

Resolution

Switch back to the default STFP subsystem:

  1. Connect to the server via SSH

  2. Comment out currently existing sftp subsystem configuration:

    Note: A backup will be placed to the /etc/ssh/sshd_config.bkp.

    # sed -i.bkp '/sftp/s/^/#/g' /etc/ssh/sshd_config

  3. Add the default binary path to the configuration:

    • Ubuntu/Debian:

      # echo 'Subsystem sftp /usr/lib/openssh/sftp-server' >> /etc/ssh/sshd_config

    • CentOS/RHEL-based:

      # echo 'Subsystem sftp /usr/libexec/openssh/sftp-server' >> /etc/ssh/sshd_config

  4. Check the SSHD configuration:

    # sshd -t

    Note: In case no output was returned, the configuration is correct.

  5. Reload the SSHD to apply new configuration:

    # service sshd reload

Note: Sometimes, it might be needed to rebuild chroot template to re-apply the settings.

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