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I have scouted over many websites and forums on how to setup an SFTP user that is jailed to a certain directory using CHROOT. Here are the steps I have followed but I can't seem to get write permissions to work.

Setup

sshd_config

#Subsystem sftp /usr/lib/openssh/sftp-server
Subsystem sftp internal-sftp


Match group webmaster
        X11Forwarding no
        ChrootDirectory %h
        AllowTcpForwarding no
        ForceCommand internal-sftp

Create Folder

mkdir /var/www/sites

Create User and Group

useradd uploader
passwd uploader
usermod -d /var/www/sites uploader
groupadd webmaster uploader
groupadd www-data uploader

Permissions and Ownership

chown root:root /var/www
chmod 755 /var/www/sites

Now with these settings the user uploader is able to SFTP into the home directory but is unable to write to the directory.

There are 2 typical errors that occur, I either can't login or I don't have write permissions.

Login Error

Error:    Network error: Software caused connection abort
Error:    Could not connect to server


Changing permissions of /var/www/sites to 775 or 777 causes login error.
chown /var/www/sites to uploader:root causes login error.
chwon root:webmaster or root:www-data I have no write permissions

I am at odds end trying to figure this out and if anyone could point me into the right direction I would be greatly appreciate it.

Thank you.

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2 Answers 2

Ok found out the solution to this, I hope it helps some people out.

The user is jailed to /var/www/sites. I then created another folder /var/www/sites/site1. I chown root:webmaster /var/www/sites/site1 as well as chmod 775 /var/www/sites/site1 . This enabled the home directory to have the correct permissions to login and then be able to write to the next folder up.

If the user needs write access to /var/www/sites, then you must jail the user at /var/www which has root:root ownership and permissions of 755. You then need to give /var/www/sites ownership of root:(your group) and permissions of 775.

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Maybe the greatest solution is:

mkdir /var/www/sites/myfirstuser/hisownsite
mkdir /var/www/sites/myseconduser/hisownsite

...

chown root:root /var/www/sites /var/www/sites/{myfirstuser,myseconduser} && chmod 755 /var/www/sites/{myfirstuser,myseconduser}

chmod 775 /var/www/sites/myfirstuser/hisownsite
chmod 775 /var/www/sites/myseconduser/hisownsite
chgrp www-data /www/sites/myfirstuser/hisownsite /var/www/sites/myseconduser/hisownsite

Add the users:

useradd -d /var/www/sites/myfirstuser -s /bin/false -g www-data  dev1
useradd -d /var/www/sites/myseconduser -s /bin/false -g www-data dev2
passwd dev1
passwd dev2

Then, for each user you have created, add an ssh tag like this: (you could also use the "Match Group" directive as in your example instead of "Match User")

Match User dev1
    ChrootDirectory %h
    ForceCommand internal-sftp
    AllowTcpForwarding no

Match user dev2
    ChrootDirectory %h
    ForceCommand internal-sftp
    AllowTcpForwarding no

So you can manage all users you need in a chrooted environment.

Hth, Fabrizio

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