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Full Discussion: SSH chroot jail problems
Operating Systems Linux Debian SSH chroot jail problems Post 302412908 by pludi on Wednesday 14th of April 2010 01:18:16 AM
Old 04-14-2010
Read up on chroot. As soon as a process changes it's root directory, it can't access the files outside anymore. Shell, utilities, password file, ... are out of reach (invisible even). You'll have to set up a minimal environment yourself inside the chroot, mirroring that of a real system.
 

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CHROOT(8)						    BSD System Manager's Manual 						 CHROOT(8)

NAME
chroot -- change root directory SYNOPSIS
chroot [-u -user] [-g -group] [-G -group,group,...] newroot [command] DESCRIPTION
The chroot command changes its root directory to the supplied directory newroot and exec's command, if supplied, or an interactive copy of your shell. If the -u, -g or -G options are given, the user, group and group list of the process are set to these values after the chroot has taken place. See setgid(2), setgroups(2), setuid(2), getgrnam(3) and getpwnam(3). Note, command or the shell are run as your real-user-id. ENVIRONMENT
The following environment variable is referenced by chroot: SHELL If set, the string specified by SHELL is interpreted as the name of the shell to exec. If the variable SHELL is not set, /bin/sh is used. SEE ALSO
chdir(2), chroot(2), environ(7) HISTORY
The chroot utility first appeared in 4.4BSD. SECURITY CONSIDERATIONS
chroot should never be installed setuid root, as it would then be possible to exploit the program to gain root privileges. 4.3 Berkeley Distribution October 6, 1998 4.3 Berkeley Distribution
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