A chroot on Unix operating systems is an operation that changes the apparent root directory for the current running process and its children.

learn more… | top users | synonyms

18
votes
5answers
12k views

How can I chroot ssh connections?

I would like to setup a chroot jail for most (not all) users logging in though SSH. I've heard it's possible with the latest versions of openssh, but I've not been able to find out how to do it. The ...
12
votes
4answers
9k views

Is there a windows equivalent to chroot?

On a *nix system I can use a chroot to isolate 2 processes from each other and from the rest of the system. Is there any similar security system under windows? Or is there any way to prevent 2 ...
11
votes
1answer
7k views

SFTP: file symlinks in a jailed (chrooted) directory

I'm trying to set up sftp so that a few trusted people can access/edit/create some files. I have jailed a user into their home directory (/home/name) but have run into a problem. I want for them to ...
10
votes
2answers
33k views

chroot fails - cannot run command `/bin/bash': No such file or directory

I'm a chroot novice trying to make a simple chroot jail but am banging my head against the same problem time and time again... Any help would be massively appreciated I've created a directory ...
10
votes
3answers
943 views

RedHat: is it possible to install packages in a kind of mock environment to build RPMs

Is there a tool that allows to install the dependecies of an RPM .spec into an isolated environment? I won't install such dependencies globally on the system and I am not able to do so since I have ...
9
votes
4answers
1k views

Why running named(bind) in chroot is so important for security? Or maybe it is not ?

I'm playing with bind and started wondering why this software is for example in CentOS running in chroot. Don't misunderstood me I know what bind is and what chroot (jail) is for. But my main wonder ...
9
votes
4answers
2k views

When is it appropriate / prudent to use chroot?

I hear about needing to chroot BIND all the time. Fair enough. But what about other programs? What are the "rules" (either personal or widely accepted/established) for deciding which programs ...
8
votes
2answers
11k views

SFTP fatal bad ownership or modes for chroot directory ubuntu 12.04

I just set up my SFTP server and it works fine when I use it from my first user account. I wanted to add a user which we will call 'magnarp'. At first I did like this in sshd_config: Subsystem sftp ...
8
votes
4answers
6k views

OpenSSH anything like 'internal-sftp' but for SCP?

I'm running Debian stable and I'm looking to establish the following environment for users in my 'sftponly' group: jailed can transfer with SFTP can transfer with SCP cannot login interactively with ...
7
votes
1answer
563 views

Why is chroot system call not available to non root user?

I was reading description about setuid on wikipedia http://en.wikipedia.org/wiki/Setuid I was unable to understand how chroot is related to setuid as mention in following paragraph from wikipedia ...
7
votes
4answers
6k views

Ubuntu - can non-root user run process in chroot jail?

Is it possible for a non-root user to run a chroot process on Ubuntu?
6
votes
2answers
899 views

Why chroot is considered insecure?

I've been playing around with CentOS box for couple of years now. So I'm pretty comfy with terminal. However, I read a lot of blog-post claiming that chroot is insecure and amount of those posts ...
6
votes
4answers
2k views

Difference between chroot and jail

I read this tutorial - https://help.ubuntu.com/community/BasicChroot - and what I understood is that, chroot is the process of changing the / while the new restricted environment created is the ...
6
votes
1answer
3k views

Trying to set up SFTP only in a chroot jail for one user

Hopefully you guys can help and see if I've done something weird here, I'm trying to log in with a user I set up, FileZilla shows me: Command: open "///@///" Command: Pass: ******** Status: ...
5
votes
3answers
5k views

Trying to setup chroot'd rsync

I'm trying to set up a backup server. I want to chroot each user (client) to its home directory, and only allow it to use sftp and rsync. I quickly discovered that I was not the only one trying to do ...
5
votes
1answer
3k views

Why use lxc instead of chroot?

One ubuntu server hosts 3 apps all on separate domains. Each app has its own developers. App developers belong to linux "sftp" group. chroot allows password sftp access for each app developer. ...
5
votes
2answers
14k views

bad ownership or modes for chroot directory component

I created the user MY_USER. Set his home dir to /var/www/RESTRICTED_DIR, which is the path he should be restricted to. Then I edited sshd_config and set: Match user MY_USER ChrootDirectory ...
5
votes
1answer
4k views

PHP-FPM's chroot and chdir directory

I am setting up php-fpm with chrooting enabled. Now I see that there are two options, and I want to know what the exact difference is. The setup has: chroot = /var/www/domains/domain.tld/ ; Chdir to ...
5
votes
4answers
718 views

Is there a chroot build script somewhere?

I am about to develop a little script to gather information for a chroot-jail. In my case this looks (at the first glance) pretty simple: The application has a clean rpm-install and did install ...
4
votes
7answers
1k views

Does using chroot for a publicly-exposed service provide any real security benefit?

I would like a definitive answer as to why this practice should be pursued with services that are exposed to potentially hostile network(s) (i.e. the Internet). As I understand it, there is a method ...
4
votes
1answer
8k views

VSFTPD - Change User Home Directory

I need to update a ftp user's home directory. Could I run the userdel command then re-add the user without losing the directory the user was attached to? Or is there another way to change the user's ...
4
votes
2answers
2k views

schroot fails to mount on entry

I'm trying to setup a chroot environment for myself, and it is failing. This has been reproduced on multiple versions (10.04 and 11.04) of Ubuntu. I set it up by doing: $ mkdir -p ...
4
votes
3answers
2k views

set up a chrooted SFTP login with OpenSSH

How might I create an SFTP login for an untrusted user in which he can only access the files in his own home directory and not run any commands? The online tutorial OpenSSH SFTP chroot() with ...
4
votes
2answers
1k views

What is the secure way to isolate ftp server users on unix?

I've read documentation for various ftp daemons and various long threads about the security implications of using a chroot environment for an ftp server when giving users write access. If you read the ...
3
votes
3answers
7k views

Why is “chroot” never used on Mac OS X?

I've been using Macs for 25 years, and "UNIX" since OS X 10.0.. but I've never really thought much about chroot, nor have I ever really needed or wanted to... It's a simple question, but... under ...
3
votes
2answers
122 views

How to create a link outside of the jail, but accessable within the jail?

I have created a chroot jail, but now I want to be able to create a link within the jail which links outside of the jail. Is this possible?
3
votes
1answer
882 views

SFTP user can't edit or create files

Server: Ubuntu 12.04 LTS I am using openSSH and have created an SFTP user called bob who belongs to group sftponly. I have chrooted bob to his home directory which is /usr/share/nginx/www/bob/. bob ...
3
votes
2answers
712 views

How to map authenticated Nginx users to their own directory?

I am writing a social networking site in C and serving it all up with Nginx. How can I make it so that authenticated users go to their own directory -ONLY- where a user-specific index.html resides. ...
3
votes
1answer
1k views

Jail User to /var/www/username Directory via SSH

I have multiple folders in /var/www for different websites -- Apache uses name-based Virtual Hosts (Ubuntu Server). Suppose I want to allow someone to access their /var/www/user directory, but not cd ...
3
votes
3answers
2k views

Good resource for chrooting Apache2 on Debian

I need a better resource than this or this on how to secure Apache2 using chroot on a Debian system. It seems most articles deal with Apache1. I tried to follow them and adapt to Apache2, but it only ...
3
votes
1answer
377 views

build user chroot on first login

I'm using ldap for remote user authentication and I basically need to either figure out how to: a. chroot a user on machine b from machine a via nfs,(which doesn't seem possible without mounting ...
3
votes
1answer
267 views

Link all LXC node APT caches to the host machine's APT cache

I have a number of LXC containers (ubuntu template) which all have their own separate APT caches. /var/lib/lxc/*/rootfs/var/cache/apt/archives/ I would like to have these linked to the host ...
3
votes
3answers
3k views

How to chroot Apache on CentOS?

I have been advised by a sysadmin, to run Apache in a chroot jail, in order to prevent that an attacker could take control of server. So my question is: What is the best method to chroot ...
3
votes
1answer
134 views

using /bin/bash in a chroot environment - symlink or mount

A user connects via ssh. The user is also chroot-ed to their home directory. The goal is security. Since the user is chroot-ed, when they login /bin/bash is not found. Obviously the user needs ...
3
votes
1answer
422 views

Resource consumption of FreeBSD's jails

Just for curiosity. An example machine: an dedicated amd64 server with the last stable version of FreeBSD and UFS for the partitions. How much resources consume FreeBSD for each empty jail? I mean, I ...
3
votes
2answers
7k views

How do I unmount a bound /proc in a “dead” chroot?

I built a debootstrap chroot and bound /proc to it, i.e. sudo mount -o bind /proc <chroot>/proc When I found I no longer needed it, I quite stupidly rm -r <chroot>'d it. Of course, rm ...
3
votes
2answers
4k views

Proftpd: How to set default root to a users home directory without jailing the user?

I've installed proftpd on my debian box but I'm having having some trouble with the configuration. In my proftpd.conf I've added; DefaultRoot ~ !ftp_special This works fine in that all users except ...
3
votes
1answer
188 views

df shows too much space on tmpfs

I have a server (SLES 11 running on a VMware hypervisor if that matters) with a tmpfs partition meant for mysql temporary tables, and I run mysql chrooted. df -h gives me strange outpupt: ...
3
votes
1answer
6k views

SFTP: log to a separate file for chrooted user

I would like to log SFTP commands to a separate file however it works only for root but not for chrooted user: # cat /etc/ssh/sshd_config ... Subsystem sftp internal-sftp -l INFO Match Group ...
3
votes
2answers
726 views

update grub2 without hardware access (e.g. in a chroot)?

I'm writing a script that takes a master KVM image, converts it to VDI, makes a few changes to it, and offers it up for download. I need to update the kernel boot parameters for some of the newly ...
3
votes
1answer
702 views

jailkit chroot terminates ssh login

I've done my very best to follow these instructions to create a chroot shell. But the connection get's terminated every time I try to login via ssh for my new chrooted user. I start my ssh terminal, ...
3
votes
0answers
625 views

Can socat be used to forward an ssh-agent socket into a chroot?

I'm building custom Debian environments on a remote server, which I connect to over SSH. This involves building a debootstrap environment, then chrooting into it to run a custom installer. As part of ...
3
votes
1answer
1k views

Increasing permissiveness/permissions for umask + openssh + chrooted SFTP server using internal-sftp

The suggestion found at these links works for me: How to setup ssh's umask for all type of connections http://ubuntuforums.org/showthread.php?t=1107974#5 Summary: Use PAM to inject the umask, ...
2
votes
4answers
5k views

Unmounting root filesystem without rebooting the server

I have a server that I can access through SSH. There is no KVM available and there's only one root partition for the whole server. I have deleted some files that I shouldn't have and want to recover ...
2
votes
3answers
668 views

Disable Linux Commands

I'm writing a simple program to back-up some files to a Linux box. The transaction will take place over SSH and each copy of the program will have its own account on the Linux box that it will ...
2
votes
2answers
3k views

Access files outside a chroot'ed environment?

I need to setup some users to access our server. I thought the most secure way to allow them access was to setup a chroot'ed jail for them to log into. But I need them to access a few select ...
2
votes
2answers
2k views

Virtualmin Chroot FTP Users [closed]

Can someone tell me how to chroot FTP users with Virtualmin, if it is possible.
2
votes
3answers
5k views

chrooting php-fpm with nginx

I'm setting up a new server with PHP 5.3.9 and nginx, so I compiled PHP with the php-fpm SAPI options. By itself it works great using the following server entry in nginx: server { listen 80; ...
2
votes
3answers
894 views

Defining hard links in puppet

Is there a way to define hardlinks inside puppet manifest? It seems file type can only define symbolic links, but I need it to be hard links in order to make some of my chrooted applications to work. ...
2
votes
4answers
4k views

Prevent rssh users from leaving their jail directories

I'm attempting to use rssh to jail users strictly to their /home/user/public_html dirctories. I got it to work where an account can SFTP into the system successfully on a test server, but once I login ...