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Full Discussion: CHRoot Problem
Top Forums UNIX for Advanced & Expert Users CHRoot Problem Post 302102069 by Crazy_murli on Monday 8th of January 2007 07:57:48 AM
Old 01-08-2007
CHRoot Problem
HI ,

I am trying to setup chrooted environment on RHEL4, for squid proxy.
I have copied the required libraries and stuff for chroot. Used the below for chroot-shell .

user is squid
[root@CHROOT-TEST ~]# grep squid /etc/passwd
squid:x:500:501::/opt/squid:/bin/chroot-shell

directory trying to jail is /opt; user entry in chrooted environment
[root@CHROOT-TEST squid]# grep squid /opt/squid/etc/passwd
squid:x:500:501::/opt:/bin/bash

[root@CHROOT-TEST ~]# more /bin/chroot-shell
#! /bin/bash
if [ "$1" = "-c" ]; then
sudo /usr/sbin/chroot /opt/$USER /bin/su - $USER $*
else
sudo /usr/sbin/chroot /opt/$USER /bin/su - $USER
fi
[root@CHROOT-TEST ~]#

/etc/sudoers entry for sudo access.

squid ALL=NOPASSWD: /usr/sbin/chroot /opt/squid /bin/su - squid

Now when I login as root[super user] and try to switch to squid user it fails.

[root@CHROOT-TEST ~]# su - squid
/bin/su: incorrect password
[root@CHROOT-TEST ~]#


Even when I try to login directly as a squid user, terminal vanishes. Seems confusing.

Would gr8ly apprecaite if someone can help me in this....
 

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LEARN ABOUT REDHAT

squid

squid(8)						      System Manager's Manual							  squid(8)

NAME

       squid - proxy caching server

SYNOPSIS

       squid [ -dhsvzCDFNRVYX ] [ -f config-file ] [ -[ au ] port ] [ -k  signal ]

DESCRIPTION

       squid  is  a  high-performance  proxy  caching  server  for web clients, supporting FTP, gopher, and HTTP data objects.	Unlike traditional
       caching software, squid handles all requests in a single, non-blocking, I/O-driven process.

       squid keeps meta data and especially hot objects cached in RAM, caches DNS lookups, supports non-blocking DNS lookups, and implements nega-
       tive caching of failed requests.

       squid  supports	SSL,  extensive access controls, and full request logging.  By using the lightweight Internet Cache Protocol, squid caches
       can be arranged in a hierarchy or mesh for additional bandwidth savings.

       squid consists of a main server program squid, a Domain Name System lookup program dnsserver, some optional programs for rewriting requests
       and  performing	authentication,  and some management and client tools.	When squid starts up, it spawns a configurable number of dnsserver
       processes, each of which can perform a single, blocking Domain Name System (DNS) lookup.  This reduces the amount of time the  cache  waits
       for DNS lookups.

       squid is derived from the ARPA-funded Harvest Project http://harvest.cs.colorado.edu/

       This  manual page only lists the command line arguments.  For details on how to configure squid see the file /etc/squid/squid.conf, the FAQ
       included with the distribution and the documentation at the squid home page http://www.squid-cache.org

OPTIONS

       -a port
	      Specify HTTP port number (default: 3128).

       -d level
	      Write debugging to stderr also.

       -f file
	      Use the given config-file instead of /etc/squid/squid.conf

       -h     Print help message.

       -k reconfigure | rotate | shutdown | interrupt | kill | debug | check | parse
	      Parse configuration file, then send signal to running copy (except -k parse) and exit.

       -s     Enable logging to syslog.

       -u port
	      Specify ICP port number (default: 3130), disable with 0.

       -v     Print version.

       -z     Create swap directories

       -C     Do not catch fatal signals.

       -D     Disable initial DNS tests.

       -F     Don't serve any requests until store is rebuilt.

       -N     No daemon mode.

       -R     Do not set REUSEADDR on port.

       -V     Virtual host httpd-accelerator.

       -X     Force full debugging.

       -Y     Only return UDP_HIT or UDP_MISS_NOFETCH during fast reload.

FILES

       /etc/squid/squid.conf
	      The main configuration file.  You must initially make changes to this file for squid to work.  For example, the  default	configura-
	      tion does not allow access from any browser.

								 squid version 2.0							  squid(8)
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