regular debian admin, i am faced to a complex situation and i appreciate your advices...

I have a server with chroot environment that is working without problems up to now : Chroot user : store chroot path : /home/store I have in this chroot environment all files (lib, bin, usr, etc) required for chroot to work. On this chroot, i have several jailed FTP / FTPs (explicit) accounts that are working correctly. Each jailed ftp is in : /home/store/home/store/partners/xxxxxx (where xxxx is the name of the partner) In each jailed FTP i have two folders : data (Listing possible), and photos (not listable). Photos is a unique directory mounted from fstab for each partner inside the chroot environnement, allowing RETR commands in FTP for each partners.

Problem is : I have a partner that must for security reason access to data in sFTP (FTP over SSH). To resolve this problem, i've chrooted a new user (lets say ALDA) to /home/store/home/store/partners/ALDA and install all necessary files to work (bin, etc, lib). User does access in sFTP to it's chrooted content, but he can access all bin/ lib/ etc/ folders that are needed for chroot, and that i managed to hide in FTPs. For my luck, write restrictions are working and user can bring no modifications to files or dirs, but user car list/retrieve all content...

1rst question : How can i restrict access / visibility to all chroot environnement files other than DATA and PHOTOS folders. 2nd question : In sFTP, user can list all mounted photo directory, and parse content... How can i totally block all listing of this specific folder, but allow when exact path is given, all "get" commands...

Thanks for your valuable time and advices..


1 Answer 1


Are you talking about sftp or about ftp over ssh (acccording to wikipedia "FTP over SSH (not SFTP) refers to the practice of tunneling a normal FTP session over an SSH connection")?

Using sftp, you do not need anymore traditionnal unix chroot as sshd can now handle it.

Answer to question 1 would then be to delete these files.

Answer to question 2 : Chroot the user in photos directory (maybe you'll need 2 users :1 for sftp, the second for your other needs).

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