Red Hat / Fedora :: What Is Chroot Jail
Jan 19, 2010what is chroot jail?
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Security :: Chroot Can't Find Any Files In The Jail - Error 'empty' Jail
Mar 27, 2010chroot in two mini distros (Tiny Core and SliTaz): chroot jail appears 'blind'. Chroot can't find any files in the jail and exit with error code. Example (ugly):
Code:
# mkdir /mnt/test
# mkdir /mnt/test/bin
# mkdir /mnt/test/dev
# mkdir /mnt/test/proc
# mkdir /mnt/test/lib
# mount /dev/hdb1 /mnt/test
# mount -t proc none /mnt/test/proc
[Code]...
chroot: cannot execute /bin/bash: No such file or directory Where is the problem?
General :: Make A Chroot Non Jail?
May 10, 2010how to prepare (before issuing the chroot command) directory links out of a chroot environment. I have done a bunch of reading, but not yet experimenting, about chroot. I mostly understand its main purpose of creating an environment in which it is safer to run untrusted software. But I want to use it for some other things, involving trusted software.
I want to create a directory tree in which the various top level directories are links to various directories in the main directory tree. For example, when running on a Debian based 64 bit system (where /lib has 64 bit .so files) I might want to create a root in which /lib links to the directory containing 32 bit .so files (same as /lib32 normally links to).
IIUC, chroot blocks soft links from getting outside. So I could create a directory containing lib as the desired soft link, but if I did chroot to that directory, the link would no longer point where I wanted. Is that correct? IIUC, I can't do a hard link to a directory. Is that correct? How would you create a directory link that would point out of a chroot "jail"? (Yes I do understand that is contrary to the common purpose for a chroot).
From reading, again not yet experimenting, I think mounting an aufs might do it. It looks like aufs might be used to mount a directory into another directory. Is that correct? Am I missing some easier way to mount a directory into a directory? Would such an aufs mount link out of the chroot? Or suffer the same fate as a soft link?
Debian :: Mount Devices In A Chroot Jail?
Apr 16, 2010I would like to create a logon script, for specific user, under ssh connection, to backup several directories in a USB device; this backup will run when the device was plugged in and the user logs in server. My knowledge of linux isn't very deeply now, and some questions are in my head. I would like to make this in a chroot jail, and the user log in through ssh connection doesn't have to make nothing, the logon script will mount the USB device and make the backup (using rsync or whatever), and exit the ssh connection when it finish.
But the questions are:
- is possible to a user in a chroot jail mount a USB device?
- from this jail, the directories outside of the jail could be available or need to be bind or something for this task?
- it will be better to "jail" all the directories to backup, inside de chroot path (almost would be samba sharing for Windows clients)?
General :: Failed To Su After Making A Chroot Jail
Oct 6, 2010On a 64 bit CentOS host I am using script make_chroot_jail.sh to put a user in a jail, not permitting it to see anything expect it's home at /home/jail/home/user1.
I did it typing this:
After, when trying to connect to user1 first i was getting an error like:
I have fixed this by copying some missed libraries:
But now, when trying to connect to user1 typing su user1 and then typing it's password, i am getting this error: could not open session
So the question is how to connect to user1 in this situation?
Here are the permissions of some files, this might be helpful in order to provide a solution:
After some modifications i managed to connect to user1, but the session closes immediately! I guess this a PAM issue, however cant find a way to fix it.
Here the log entry for close action from /val/log/secure:
What makes the session to exit immediately after launching?
Ubuntu :: Info On Chroot Jail And If Break Out Of It?
Jul 16, 2010im looking for info on chroot jail and if you can break out of it. does anyone know where to find info?
View 1 Replies View RelatedGeneral :: Mount Devices In A Chroot Jail?
Apr 20, 2010I would like to create a logon script, for specific user, under ssh connection, to backup several directories in a USB device; this backup will run when the device was plugged in and the user logs in server. My knowledge of linux isn't very deeply now, and some questions are in my head. I would like to make this in a chroot jail, and the user log in through ssh connection doesn't have to make nothing, the logon script will mount the USB device and make the backup (using rsync or whatever), and exit the ssh connection when it finish.
Anyway the questions are:
- is possible that a user in a chroot jail mount a USB device?
- from this jail, the directories outside of the jail could be available or need to be bind or something for this task?
- it will be better to "jail" all the directories to backup, inside de chroot path (almost would be samba sharing for Windows clients)?
Security :: Sandbox / Chroot Jail And Separate Filesystem?
May 4, 2011I want to make a sandbox for my music streaming server(subsonic). I was going to make a directory and chroot to it. I don't really have any room on my HD for new partitions. For the sandbox/chroot jail to be proper does it need to be on a seperate filesystem/mount point?
View 1 Replies View RelatedGeneral :: Chroot Jail - How Safe If It Is Locked Down And How Difficult Is Building A Secure
Mar 16, 2010How safe is a chroot if it is locked down? how difficult is building a secure chroot? Does anyone know of any working tutorials for setting up a secure chroot? i only need it to run two applications, a torrent client and a VPN client. I'm hoping to set one up on Ubuntu Karmic. also, I found this, under 'section 4' he gave no write permissions to any non root user, can this be extended upon? which directories do limited users require write access to? what else would you consider essential to security inside a chroot?
View 1 Replies View RelatedSecurity :: Call Access Out Side Chroot Jail Files From Apache?
Apr 2, 2010I have one requirement i.e I want to call the java file from the php function using shell_exec command , i am using the chroot jail concept , if i using this command i am getting the empty file because java environment is outside the chroot jail,so how to access the the files those are out side the chroot jail.
View 3 Replies View RelatedGeneral :: Chroot Error - Cannot Change Root Directory To /jail - Operation Not Permitted
Apr 18, 2011I am trying to create a jailed shell for a user Don($UID '500') using my own method(I don't want to use any ready-made "jailkit"). The user don should get a home directory /jail/don instead of /home/don when he login via SSH (So that he will not able to see any other files/directories on the system)
This is what I have done.
Quote:
Code:
It works without any issue ....Home directory changes to /jail/don when I ssh to the system as user don. ie: #ssh don@192.168.0.66
Then I added a chroot command to this code.
Code:
Unfortunately , now I am getting an error message saying that "chroot: cannot change root directory to /jail: Operation not permitted" .. I am not sure how to rectify this error... Is my approach correct to get a jailed shell using /etc/profile file ?
Ubuntu Servers :: Completely Chroot Enviornoment Where Every Single Service Is In Chroot Mode (bind,mysql, Postfix)?
Jul 12, 2011recently we decided to make our own panel (like Plesk or cPanel) but for Ubuntu and it will be licenced under GPL (like any other professional sofware).want to make a panel not only that fits our needs but also the needs of other system administrators and domain owners. We researched other panels and found out that non of them has security/look/ease of use in one package. Bad codig is another problem found in other panels.I made a short overwiev of what I think we have to have in the beginning.I Security :1. Completely chroot enviornoment where every single service is in chroot mode (bind,mysql, postfix, .... )2. Easily managed IPtables trough web-based interface. 3. Coding rules has to be strict.
II Software selection :
1. MTA - Postfix
2. POP - dovecot
[code]....
Red Hat / Fedora :: Chroot And MySQL And FTP Access Is Tunnelled Through SSH Using OpenSSH
Jan 19, 2010The server I am working with is running CentOS 5.x. MySQL and FTP access is tunnelled through SSH using OpenSSH. Users are chrooted to their home directory as follows:
User: tristan
Home: /web/tristan/
Now, up to this point everything works fine (FTP access) except for MySQL tunnelling. The application I use for MySQL administration is Navicat. It allows me to access the remote SQL server as though it's local using a SSH tunnel. The problem is that I am unable to create a connection to the SQL server through tunnelling unless chroot is removed for the user. Once chroot is removed, I am able to connect to the SQL server just fine via tunnelling. However, ow when using SFTP, the user's "home" directory is now the root of the drive (which is what we don't want).
I wish I could give you more information about the configuration. Another user set this server up and unfortunately I will not be able to access the machine until a few days from now so my information is limited.
Fedora Servers :: How To Chroot The Sftponly Users Into Their Home Directory
May 21, 2010I have an SFTP server using OpenSSH on a server running Fedora 12. I want to chroot my sftponly users into their home directory but I want to let them have write access to their upload/ folder. Right now users can log in and view & download items, but for some reason I can't get write access to work. Here's some info:
username: testuser
group: sftponly
from /etc/passwd:
testuser:x:501:501::/home/testuser/:/bin/false
[code]...
Fedora :: Chroot Users To Home Directory In SFTP Server?
Apr 12, 2011I see this questioned asked a lot and figured this tutorialThis tutorial explains how to create an SFTP server which confines (or chroot) users to their own home directory and deny them shell access.
View 1 Replies View RelatedDebian :: Jail A Process Without Rootaccess?
Aug 17, 2011This is my first post, so bear over with me. I have a user that runs a process that controls servers. Every server has its own directory. The "server" is a .jar. The server gets started with a .sh script. I want the server to be jailed to it's folder, however it aint possible to run chroot because its not a superuser. What can I do? I've found out that jk_uchroot should do so I can run chroot as another user, however I cant get it to work properly and I cant find any good howto's or better documentation about it.
View 2 Replies View RelatedDebian :: Determine If An Service / App Is In Chrooted Jail
May 31, 2010I am trying to find out, if an application is chrooted jail or not. I have tried to do as suggested here, but something is wrong I believe. [URL]
pidof apache2
24714 24404 24366 24365 24364 24363 24362 4923
ls -ld /proc/24714/root
lrwxrwxrwx 1 root root 0 May 31 19:05 /proc/24714/root -> /
So far so good. Now we try with postfix, ups, nothing to show ? pidof postfix Lets try with the postfix master process instead. pidof master 2623
ls -ld /proc/2623/root
lrwxrwxrwx 1 root root 0 May 31 19:07 /proc/2623/root -> /
It shows it as not being chrooted jail, which I do not understand, since I KNOW that postfix runs chrooted jail.
Ubuntu Security :: User (in Jail) With Very Limited Permissions
Nov 21, 2010I want to have an account (beta user), on which:I can use the Internet and other programs without administrative rights without the right to install programs with a kind of sandbox for everything that is connected to the Internet, which means: everything that is associated with the web browser's processes and files that I save to hard disk I want to be separated from the rest of the system, so that whatever can catch up on this account will be locked in it, for example any (if at all) possible malicious scripts from Internet or whatever may be dangerous now or invented in the future. Sometimes, for example, I save the web page to disk with all it content.
And in case someone cracked into this account I want make it in that way that he could not do any tricks to read or change passwords, or make any other changes to the system. The best would be if a password for that user might serve only to log in without having any other powers, and I would give that user an automatic login. For now I created a beta user without administrative rights. I understand that the limiting rights of the user are associated with limiting rights to their home directory. There are also groups, and a user may be included or excluded. I excluded that user from admin group but I don't know what else I can limit and how. When I give chmod 0644 for /home of this user he cannot run Firefox. When I give him 0740 he can run applications, so I assume the x attribute must be preserved.
This is a user without sudo rights, so when I type sudo apt-get update a message shows up correctly that this user doesn't belong to the sudoers group. But still it's not what I wanted. When the user runs Gufw and wants to change the settings to disable the firewall, a message shows up asking to type in a password of alpha user = primary user, which is that belonging to the sudoers group, the first / main user that I created during system installation. I wish that there was only the message that the beta user has no power to change anything, which means even completely remove the possibility of asking for sudo.
In addition, I wish that this beta couldn't be able to change the permissions to its home directory, or go to see what is above. Because so far beta can change the file permissions for its /home, even without a sudo password. How can I do it? Do I need to create a kind of chroot jail for this user? I would like any changes to that user account could be made only after the user log off from beta account, and log in on alfa account and that beta could run only programs that ware installed by alpha. And that beta could read and write, but alfa could also read and write or remove, alter files on beta account. Basically, alfa account should be superior to beta account. Can do that?
Ubuntu Servers :: Modify Permission On Jail User?
Dec 3, 2010Does anyone know how to modify permission on jail user. current jail user added to its /home/jail/*
How can I assign jail user(s) enough permission to access /opt, /var, or any other directories other than /home/jail/* ?
Server :: SFTP Jail Users Password Updation?
Mar 22, 2011I have configured the SFTP Jail for some of the users in my sftp server and which is hosted for my clients.i have one small issues and i need the help from experts. e /../jajil/etc/shadow file. can you please help me how to update the password in /../jail/etc/shadow file instead of updating in /etc/shadow file.
View 3 Replies View RelatedOpenSUSE Network :: Named Fail To Start (jail) And Dhcpd
Sep 16, 2010Just for information in case if it is important to start dhcpd and named: Sep 16 20:26:44 LINUX-SRV named[2417]: nss_ldap: could not search LDAP server - Server is unavailable Sep 16 20:26:44 LINUX-SRV named[2417]: nss_ldap: could not search LDAP server - Server is unavailable
Secondly Both config files in /etc/sysconfig set parameters to start in jail root but
[Code]....
Software :: Jail / Restrict A Sftp User To Home Directory?
Mar 9, 2011In RedHat 4/5 How can i jail/restrict an sftp user to his home directory?
Can i do this without using rssh ?
Ubuntu :: How To Chroot Through Ssh
Feb 3, 2010Getting full access to /home is a piece of cake. I want to be able to look in on all the files. I would also like to know how to chroot through ssh.
View 9 Replies View RelatedDebian Multimedia :: How To Run X In Chroot
Apr 29, 2015How to run X in chroot ?
View 3 Replies View RelatedSoftware :: Possible To Use The Cd Command In Chroot?
Jul 20, 2010In a script that I'm still writing, I'm trying to build a package from source within a chroot'ed environment. 1) I could chroot and then cd to /usr/src and then manually install the package. 2) I could chroot and then run the installation script from the proper directory. 3) What I want to do and what's giving me issues, is to issue a command similar to this:
Code:
chroot /root/me/here cd /usr/src
...and have it do the installation after changing to /usr/src.
[code]....
CentOS 5 :: Ftp - Chroot In The Shell?
Jul 30, 2009ive created user in my server for vsftp and they are chroot when they use the ftp but not when they use the shell. How to chroot them into the shell?
View 3 Replies View RelatedDebian Configuration :: Man-db In Chroot Ssh Environment
Aug 26, 2015I've been bashing around this for a couple of days, and could not find answer by using google. My debian 8.1.0 jessie runs perfectly fine. To perform SSH chroot jail, I issued an apt-get install makejail.
The ssh chroot environment runs great. I used makejail configuration scripts. The man pages are perfectly available from TTY login. Yet from a SSH session (chroot jailed) the man pages could not be found.
My MANPATH environment variable points at /usr/share/man
Running "mandb -c" from a SSH session as root tells:
0 man subdirectories contained newer manual pages.
0 manual pages were added.
0 stray cats were added.
0 old database entries were purged.
simply copying the contents of the /usr/share/man to /jail/usr/share/man
and running the "mandb -c" command gives lots of "dangling symlink" errors.
Perhaps the /jail directory need some dependent files, or change file permissions somewhere but I just couldn' t figure that out.
OpenSUSE Install :: How To Set Up A Chroot Environment
Aug 25, 2011I`m running openSUSE Tumbleweed so the first question is: can i run ONLY another openSUSE OS inside the environment ? or can i run any distro i want ?
My second question is how do it set up the environment to act just like my normal OS, with both root and user rights on it? and of course can i run X ?
And finally third question: after googling a bit i did not found a tutorial for openSUSE but i have seen that is says that i have mount and/or bind certain things, how do i make the same thing under openSUSE for the respective chroot environment?
Ubuntu :: How To Reboot A Chroot Environment
Nov 30, 2010i created a chroot environment for maverick. while installing packages and ubuntu-desktop it says that i need to restart. when i pass the command " sudo shutdown -r 0" my whole system gets restarted. how can i restart that particular environment.
View 3 Replies View RelatedUbuntu :: No Names In Chroot Environment
Dec 4, 2010I created a chroot environment for lucid. when i log in by executing this command "sudo chroot /var/chroot/lucid" it logged me in as a root user. i created a new account there, when i log in by that account i cant see anything written before $ sign. even if i change directory or anything else i cant see anything.
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