Date: Wed, 11 Apr 2007 11:37:00 -0500 From: Derek Ragona <derek@computinginnovations.com> To: "Thiago Esteves de Oliveira" <thiago@lamce.coppe.ufrj.edu.br> Cc: freebsd-questions@freebsd.org Subject: Re: Chroot/jail mechanism in ssh and sftp connections Message-ID: <6.0.0.22.2.20070411112944.0257b920@mail.computinginnovations.com> In-Reply-To: <56870.146.164.92.1.1176308436.squirrel@www.lamce.coppe.ufr j.br> References: <63726.146.164.92.1.1176218908.squirrel@www.lamce.coppe.ufrj.br> <6.0.0.22.2.20070410105843.02537e38@mail.computinginnovations.com> <56870.146.164.92.1.1176308436.squirrel@www.lamce.coppe.ufrj.br>
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At 11:20 AM 4/11/2007, Thiago Esteves de Oliveira wrote: >Thanks for the suggestion. I intend to study about this possible solution >but to save time I'd >like to ask you some questions. > >With this software, can I control which accounts "from the unix passwd >file" will be able to log in? Yes just set the shell to a non-login shell for users you don't want to give shell access. Typically I set those user's shell to: /usr/bin/false >If there is a symbolic link in the home directory(jail/chroot) that point >to anywhere out of it, >will the users be able to use this symlink? Will they go out from their >jail/chroot directory this >way? You can actually specify what ftp commands are allowed in the vsftpd.conf file in one server I manage I have set: cmds_allowed=PASV,RETR,QUIT,USER,PASS,STOR,CDDN,CWD,LIST,GET,PUT,DIR,PWD,SYST,LS,TYPE,DELE,FEAT,PBSZ,PROT But you'd probably want to remove any symlinks that shouldn't be there. >Derek Ragona wrote: > > At 10:28 AM 4/10/2007, Thiago Esteves de Oliveira wrote: > >>Hello, > >>I want to use the chroot/jail mechanism in user's ssh and sftp > >>connections. I've read some > >>tutorials and possible solutions to jail/chroot the users into their > own home directories. One >is > >>to install the openssh-portable(with chroot option turned on) from the > ports collection. I've >installed the openssh-portable, but the jail/chroot mechanism didn't work. >I think it requires >some configuration in its sshd_config file, but I'm not sure because I >have found nothing about >jail/chroot in the openssh(sshd_config) man pages. > > > > I have implemented a similar setup using vsftpd from the ports. It > works well for secure ftp >when used with the filezilla client. You can limit the ftp command in the >vsftpd configuration >file so users cannot get out of their home directories, which chroots them >there. You do need to >add one thing to the accounts, which is to change their home directory in >/etc/passwd adding an >additional dot. For instance if a users home directory is: > > /home/user > > > > You'd need to change it to: > > /home/./user > > > > vsftpd is well documented and relatively easy to get setup and running. > > > > -Derek > > -- This message has been scanned for viruses and dangerous content by MailScanner, and is believed to be clean. MailScanner thanks transtec Computers for their support.
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