CentOS构建chroot环境

说明：chroot–change root(改变角色)，例如apache服务，这个服务是直接安装到了根目录下面的所以当ps后看进程信息的时候后面的路径是以系统的“根”开始找的。如果想搭建起来这个chroot的环境，需要工具–jail.tar.gz，jail(监狱)也就是把自己想让服务更安全，那么就把服务扔到监狱中去运行，黑客入侵了也只能在监狱中控制，不能跳出监狱进行别的控制。本文介绍的可能有些长，请看详细步骤！
 
1 安装jail并构建监狱环境
 
[root@rrd ~]# useradd -g users -d /var/chroot/ -s /usr/bin/jail prisoner
 
[root@rrd ~]# tail /etc/passwd
 
prisoner:x:501:100::/var/chroot/:/usr/bin/jail
 
[root@rrd ~]# wget http://www.jmcresearch.com/static/dwn/projects/jail/jail.tar.gz
 
[root@rrd ~]# tar zxf jail.tar.gz
 
[root@rrd ~]# cd jail/bin
 
[root@rrd bin]# ll
 
total 20
 
-rwxr-xr-x 1 1002 1002 4726 Apr  2  2004 addjailsw
 
-rwxr-xr-x 1 1002 1002 2578 Apr  2  2004 addjailuser
 
drwxr-xr-x 2 1002 1002 4096 Apr  2  2004 CVS
 
-rwxr-xr-x 1 1002 1002 2750 Apr  2  2004 mkjailenv
 
[root@rrd bin]# cd ..
 
[root@rrd jail]# cd src/
 
[root@rrd src]# ll
 
total 68
 
drwxr-xr-x 2 1002 1002  4096 Apr  2  2004 CVS
 
-rw-r–r– 1 1002 1002  5893 Apr  2  2004 generic_helpers.c
 
-rw-r–r– 1 1002 1002  1478 Apr  2  2004 generic_helpers.h
 
-rw-r–r– 1 1002 1002  2111 Apr  2  2004 globals.h
 
-rw-r–r– 1 1002 1002  1260 Apr  2  2004 helpers.h
 
-rw-r–r– 1 1002 1002 13379 Apr  2  2004 jail.c
 
-rw-r–r– 1 1002 1002  1913 Apr  2  2004 Makefile
 
-rw-r–r– 1 1002 1002  3790 Apr  2  2004 passwd_helpers.c
 
-rw-r–r– 1 1002 1002  1396 Apr  2  2004 passwd_helpers.h
 
-rwxr-xr-x 1 1002 1002  1669 Apr  2  2004 preinstall.sh
 
-rw-r–r– 1 1002 1002  3386 Apr  2  2004 terminal_helpers.c
 
-rw-r–r– 1 1002 1002  1304 Apr  2  2004 terminal_helpers.h
 
-rw-r–r– 1 1002 1002  1770 Apr  2  2004 types.h
 
[root@rrd src]# vim Makefile
 
INSTALL_DIR = /tmp/jail##找到这一行，路径改成/usr/local/jail，保存后退出（看个人习惯）
 
[root@rrd src]# mkdir /usr/local/jail
 
[root@rrd src]# make
 
[root@rrd src]# make install
 
[root@rrd src]# /usr/local/jail/bin/mkjailenv /var/chroot
 
mkjailenv
 
A component of Jail (version 1.9 for linux)
 
http://www.jmcresearch.com/projects/jail/
 
Juan M. Casillas <juanm.casillas@jmcresearch.com>
 
Making chrooted environment into /var/chroot
 
        Doing preinstall()
 
        Doing special_devices()
 
        Doing gen_template_password()
 
        Doing postinstall()
 
Done.
 
[root@rrd src]# ll /var/chroot/##目录下有文件了
 
total 8
 
drwxr-xr-x 2 root root 4096 Aug 31 19:49 dev
 
drwxr-xr-x 2 root root 4096 Aug 31 19:49 etc
 
[root@rrd src]# /usr/local/jail/bin/addjailuser /var/chroot /home/prisoner /bin/bash prisoner
 
addjailuser
 
A component of Jail (version 1.9 for linux)
 
http://www.jmcresearch.com/projects/jail/
 
Juan M. Casillas <juanm.casillas@jmcresearch.com>
 
Adding user prisoner in chrooted environment /var/chroot
 
Done.
 
[root@rrd src]# ll /var/chroot/
 
total 12
 
drwxr-xr-x 2 root root 4096 Aug 31 19:49 dev
 
drwxr-xr-x 2 root root 4096 Aug 31 19:49 etc
 
drwxr-xr-x 3 root root 4096 Aug 31 19:51 home
 
[root@rrd src]# /usr/local/jail/bin/addjailsw /var/chroot/
 
或
 
[root@rrd src]# /usr/local/jail/bin/addjailsw /var/chroot/ -D
 
或
 
[root@rrd src]# /usr/local/jail/bin/addjailsw /var/chroot/ -P bash “–version”
 
addjailsw
 
A component of Jail (version 1.9 for linux)
 
http://www.jmcresearch.com/projects/jail/
 
Juan M. Casillas <juanm.casillas@jmcresearch.com>
 
Guessing mv args()
 
Guessing ls args()
 
Guessing ln args()
 
Guessing grep args()
 
Guessing cat args()
 
Guessing rmdir args()
 
Guessing vi args(-c q)
 
Guessing tail args()
 
Guessing sh args()
 
Guessing id args()
 
Guessing rm args()
 
Guessing head args()
 
Guessing cp args()
 
Guessing pwd args()
 
Guessing mkdir args()
 
Guessing touch args()
 
Guessing more args()
 
Warning: can’t create /proc/mounts from the /proc filesystem
 
Warning: can’t create /proc/filesystems from the /proc filesystem
 
Warning: not allowed to overwrite /var/chroot//etc/passwd
 
Warning: not allowed to overwrite /var/chroot//etc/group
 
Warning: can’t create /proc/meminfo from the /proc filesystem
 
Done.
 
[root@rrd chroot]# ll
 
total 32
 
drwxr-xr-x 2 root root 4096 Aug 31 19:57 bin
 
drwxr-xr-x 2 root root 4096 Aug 31 19:56 dev
 
drwxr-xr-x 3 root root 4096 Aug 31 19:56 etc
 
drwxr-xr-x 3 root root 4096 Aug 31 19:51 home
 
drwxr-xr-x 2 root root 4096 Aug 31 19:56 lib64
 
drwsrwxrwx 2 root root 4096 Aug 31 19:57 tmp
 
drwxr-xr-x 6 root root 4096 Aug 31 19:56 usr
 
drwxr-xr-x 3 root root 4096 Aug 31 19:57 var
 
[root@rrd chroot]# mkdir /var/chroot/lib
 
[root@rrd chroot]# cp /lib/ld-linux.so.2 /var/chroot/lib/
 
[root@rrd chroot]# ll lib64/
 
total 2508
 
-rwxr-xr-x 1 root root  27920 Aug 31 19:56 libacl.so.1
 
-rwxr-xr-x 1 root root  17888 Aug 31 19:56 libattr.so.1
 
-rwxr-xr-x 1 root root 1717800 Aug 31 19:57 libc.so.6
 
-rwxr-xr-x 1 root root  23360 Aug 31 19:57 libdl.so.2
 
-rwxr-xr-x 1 root root  53880 Aug 31 19:56 libnss_files.so.2
 
-rwxr-xr-x 1 root root  117680 Aug 31 19:56 libpcre.so.0
 
-rwxr-xr-x 1 root root  145824 Aug 31 19:56 libpthread.so.0
 
-rwxr-xr-x 1 root root  53448 Aug 31 19:56 librt.so.1
 
-rwxr-xr-x 1 root root  95464 Aug 31 19:56 libselinux.so.1
 
-rwxr-xr-x 1 root root  247496 Aug 31 19:56 libsepol.so.1
 
-rwxr-xr-x 1 root root  15584 Aug 31 19:57 libtermcap.so.2
 
[root@rrd chroot]# cp /lib64/ld-linux-x86-64.so.2 /var/chroot/lib64/
 
[root@rrd chroot]# mkdir /var/chroot/etc/bash
 
[root@rrd chroot]# cp /etc/bashrc /var/chroot/etc/bash/
 
[root@rrd chroot]# cp /etc/profile /var/chroot/etc/
 
[root@rrd chroot]# cp /etc/DIR_COLORS /var/chroot/etc/
 
[root@rrd chroot]# /usr/local/jail/bin/addjailsw /var/chroot/ -P whoami
 
addjailsw
 
A component of Jail (version 1.9 for linux)
 
http://www.jmcresearch.com/projects/jail/
 
Juan M. Casillas <juanm.casillas@jmcresearch.com>
 
Guessing whoami args(0)
 
Warning: file /var/chroot//lib64/libc.so.6 exists. Overwritting it
 
Warning: file /var/chroot//etc/ld.so.cache exists. Overwritting it
 
Warning: file /var/chroot//usr/lib/locale/locale-archive exists. Overwritting it
 
Warning: file /var/chroot//usr/share/locale/locale.alias exists. Overwritting it
 
Done.
 
如果在chroot环境中可以访问的IP地址，但没有域名（“名称或服务不知道”）：
 
[root@rrd chroot]# cp -a /lib/libnss_dns* /lib/libresolv* /var/chroot/lib/
 
64架构的
 
[root@rrd chroot]# cp -a /lib64/libnss_dns* /lib64/libresolv* /var/chroot/lib64/
 
[root@rrd chroot]# ll
 
total 36
 
drwxr-xr-x 2 root root 4096 Aug 31 19:57 bin
 
drwxr-xr-x 2 root root 4096 Aug 31 19:56 dev
 
drwxr-xr-x 4 root root 4096 Aug 31 20:06 etc
 
drwxr-xr-x 3 root root 4096 Aug 31 19:51 home
 
drwxr-xr-x 2 root root 4096 Aug 31 20:26 lib
 
drwxr-xr-x 2 root root 4096 Aug 31 20:27 lib64
 
drwsrwxrwx 2 root root 4096 Aug 31 20:07 tmp
 
drwxr-xr-x 6 root root 4096 Aug 31 19:56 usr
 
drwxr-xr-x 3 root root 4096 Aug 31 20:07 var
 
[root@rrd chroot]# ll dev/
 
total 0
 
crw-rw-rw- 1 root root 1, 3 Aug 31 19:49 null
 
crw-rw-rw- 1 root tty  5, 0 Aug 31 19:56 tty
 
cr–r–r– 1 root root 1, 9 Aug 31 19:49 urandom
 
crw-rw-rw- 1 root root 1, 5 Aug 31 19:49 zero
 
[root@rrd chroot]# mount -o bind /dev/ /var/chroot/dev/
 
[root@rrd chroot]# ll dev/##会列出很多文件，就不贴出来了
 
[root@rrd chroot]# mount -t devpts none /var/chroot/dev/pts
 
[root@rrd chroot]# mkdir /var/chroot/proc2 apache服务放到监狱中运行
 
注意了
 
[root@rrd chroot]# netstat -lnt
 
Active Internet connections (only servers)
 
Proto Recv-Q Send-Q Local Address              Foreign Address            State     
 
tcp        0      0 0.0.0.0:686                0.0.0.0:*                  LISTEN     
 
tcp        0      0 0.0.0.0:111                0.0.0.0:*                  LISTEN     
 
tcp        0      0 127.0.0.1:631              0.0.0.0:*                  LISTEN     
 
tcp        0      0 127.0.0.1:25                0.0.0.0:*                  LISTEN     
 
tcp        0      0 :::80                      :::*                        LISTEN     
 
tcp        0      0 :::22                      :::*                        LISTEN     
 
[root@rrd chroot]# ps -ef|grep httpd
 
root    11412    1  0 19:03 ?        00:00:00 /application/apache2.2.21/bin/httpd -k graceful
 
daemon  11413 11412  0 19:03 ?        00:00:00 /application/apache2.2.21/bin/httpd -k graceful
 
daemon  11415 11412  0 19:03 ?        00:00:00 /application/apache2.2.21/bin/httpd -k graceful
 
daemon  11417 11412  0 19:03 ?        00:00:00 /application/apache2.2.21/bin/httpd -k graceful
 
daemon  11419 11412  0 19:03 ?        00:00:00 /application/apache2.2.21/bin/httpd -k graceful
 
daemon  11500 11412  0 19:03 ?        00:00:00 /application/apache2.2.21/bin/httpd -k graceful
 
root    12354  3265  0 20:33 pts/0    00:00:00 grep httpd
 
[root@rrd chroot]# killall httpd
 
[root@rrd chroot]# killall httpd
 
[root@rrd chroot]# killall httpd
 
[root@rrd chroot]# cp -a /application/apache2.2.21/ .
 
[root@rrd chroot]# ll
 
total 40
 
drwxr-xr-x 15 root root 4096 Aug 31 18:36 apache2.2.21
 
[root@rrd chroot]# vim /etc/passwd
 
daemon:x:2:2:daemon:/sbin:/bin/bash
 
[root@rrd chroot]# vim etc/passwd
 
daemon:x:2:2:daemon:/sbin:/bin/bash
 
[root@rrd chroot]# su – daemon & 
 
[1] 12488
 
[root@rrd chroot]# who am i
 
root    pts/0        2012-08-31 18:32 (172.16.0.132)
 
[1]+  Stopped                su – daemon
 
[root@rrd chroot]# whoami
 
Root
 
[root@rrd chroot]# find / -name httpd    ##看看httpd文件都在哪里
 
/etc/httpd
 
/application/apache2.2.21/bin/httpd
 
/usr/lib64/httpd
 
/home/lincong/tools/httpd-2.2.21/.libs/httpd
 
/home/lincong/tools/httpd-2.2.21/httpd
 
/var/log/httpd
 
/var/chroot/apache2.2.21/bin/httpd##监狱下面有一个
 
[root@rrd chroot]# netstat -lnt          ##检查一下端口，80不在了说明杀掉了
 
Active Internet connections (only servers)
 
Proto Recv-Q Send-Q Local Address              Foreign Address            State     
 
tcp        0      0 0.0.0.0:686                0.0.0.0:*                  LISTEN     
 
tcp        0      0 0.0.0.0:111                0.0.0.0:*                  LISTEN     
 
tcp        0      0 127.0.0.1:631              0.0.0.0:*                  LISTEN     
 
tcp        0      0 127.0.0.1:25                0.0.0.0:*                  LISTEN     
 
tcp        0      0 :::22 
 
[root@rrd chroot]# /var/chroot/apache2.2.21/bin/httpd  ##监狱环境中启动apache
 
[root@rrd chroot]# netstat -lnt |grep 80
 
Active Internet connections (only servers)
 
Proto Recv-Q Send-Q Local Address              Foreign Address            State     
 
tcp        0      0 :::80                      :::*                        LISTEN     
 
[root@rrd chroot]# ps -ef|grep httpd
 
root    12683    1  0 22:20 ?        00:00:00 /var/chroot/apache2.2.21/bin/httpd
 
daemon  12684 12683  0 22:20 ?        00:00:00 /var/chroot/apache2.2.21/bin/httpd
 
daemon  12686 12683  0 22:20 ?        00:00:00 /var/chroot/apache2.2.21/bin/httpd
 
daemon  12688 12683  0 22:20 ?        00:00:00 /var/chroot/apache2.2.21/bin/httpd
 
daemon  12690 12683  0 22:20 ?        00:00:00 /var/chroot/apache2.2.21/bin/httpd
 
root    12772  3265  0 22:21 pts/0    00:00:00 grep httpd
 
Httpd服务已经进到监狱了3 mysql服务放到监狱环境中运行
 
[root@rrd chroot]# /etc/init.d/mysqld start
 
Starting MySQL                                            [  OK  ]
 
[root@rrd chroot]# ps -ef|grep mysqld
 
root    12784    1  0 22:22 pts/0    00:00:00 /bin/sh /usr/local/mysql/bin/mysqld_safe –datadir=/usr/local/mysql/data –pid-file=/usr/local/mysql/data/rrd.pid
 
mysql    12886 12784  0 22:22 pts/0    00:00:00 /usr/local/mysql/libexec/mysqld –basedir=/usr/local/mysql –datadir=/usr/local/mysql/data –user=mysql –log-error=/usr/local/mysql/data/rrd.err –pid-file=/usr/local/mysql/data/rrd.pid –socket=/usr/local/mysql/tmp/mysql.sock –port=3306
 
root    12901  3265  0 22:22 pts/0    00:00:00 grep mysqld
 
[root@rrd chroot]# killall mysqld
 
[root@rrd chroot]# killall mysqld
 
[root@rrd chroot]# killall mysqld
 
[root@rrd chroot]# cp -a /usr/local/mysql/ .
 
[root@rrd chroot]# find / -name mysqld
 
/etc/rc.d/init.d/mysqld
 
/usr/local/mysql/libexec/mysqld
 
/home/lincong/tools/mysql-5.1.52/sql/mysqld
 
/chroot/mysql/usr/local/mysql/libexec/mysqld
 
/var/chroot/mysql/libexec/mysqld
 
[root@rrd chroot]# /var/chroot/mysql/libexec/mysqld        ##启动时有错误
 
120831 22:29:51 [Warning] ‘–skip-locking’ is deprecated and will be removed in a future release. Please use ‘–skip-external-locking’ instead.
 
120831 22:29:51 [ERROR] Fatal error: Please read “Security” section of the manual to find out how to run mysqld as root!
 
120831 22:29:51 [ERROR] Aborting
 
120831 22:29:51 [Note] /var/chroot/mysql/libexec/mysqld: Shutdown complete
 
解决办法：
 
[root@rrd chroot]# vim etc/my.cnf
 
[mysqld]
 
#skip-locking##注释掉
 
skip-external-locking  ##添加这行
 
[root@rrd chroot]# /var/chroot/mysql/libexec/mysqld ##还有错误
 
120831 22:38:50 [ERROR] Fatal error: Please read “Security” section of the manual to find out how to run mysqld as root!
 
120831 22:38:50 [ERROR] Aborting
 
120831 22:38:50 [Note] /var/chroot/mysql/libexec/mysqld: Shutdown complete
 
解决办法：
 
[root@rrd chroot]# vim /etc/my.cnf
 
[mysqld]
 
user            = mysql
 
[root@rrd chroot]# cp /etc/my.cnf etc/my.cnf
 
[root@rrd chroot]# /var/chroot/mysql/libexec/mysqld
 
120831 22:44:27  InnoDB: Started; log sequence number 0 44233
 
120831 22:44:27 [Note] Event Scheduler: Loaded 0 events
 
120831 22:44:27 [Note] /var/chroot/mysql/libexec/mysqld: ready for connections.
 
Version: ‘5.1.52’  socket: ‘/usr/local/mysql/tmp/mysql.sock’  port: 3306  Source distribution
 
Last login: Fri Aug 31 18:32:41 2012 from 172.16.0.132
 
[root@rrd ~]# netstat -lnt
 
Active Internet connections (only servers)
 
Proto Recv-Q Send-Q Local Address              Foreign Address            State     
 
tcp        0      0 0.0.0.0:3306                0.0.0.0:*                  LISTEN     
 
tcp        0      0 0.0.0.0:686                0.0.0.0:*                  LISTEN     
 
tcp        0      0 0.0.0.0:111                0.0.0.0:*                  LISTEN     
 
tcp        0      0 127.0.0.1:631              0.0.0.0:*                  LISTEN     
 
tcp        0      0 127.0.0.1:25                0.0.0.0:*                  LISTEN     
 
tcp        0      0 :::80                      :::*                        LISTEN     
 
tcp        0      0 :::22                      :::*                        LISTEN     
 
[root@rrd ~]# ps -ef|grep mysqld
 
mysql    12987    1  0 22:44 ?        00:00:00 /var/chroot/mysql/libexec/mysqld
 
root    13041 13011  0 22:50 pts/1    00:00:00 grep mysqld
 
[root@rrd ~]# mysql
 
Welcome to the MySQL monitor.  Commands end with ; or \g.
 
Your MySQL connection id is 1
 
Server version: 5.1.52 Source distribution
 
Copyright (c) 2000, 2010, Oracle and/or its affiliates. All rights reserved.
 
This software comes with ABSOLUTELY NO WARRANTY. This is free software,
 
and you are welcome to modify and redistribute it under the GPL v2 license
 
Type ‘help;’ or ‘\h’ for help. Type ‘\c’ to clear the current input statement.
 
mysql> show databases;
 
+——————–+
 
| Database          |
 
+——————–+
 
| information_schema |
 
| mysql              |
 
| test              |
 
+——————–+
 
3 rows in set (0.00 sec)
 
[root@rrd ~]# chroot /var/chroot/
 
bash-3.2# ls
 
apache2.2.21  bin  dev  etc  home  lib  lib64  mysql  proc  tmp  usr  var
 
######################################################################################
 
[root@rrd src]# /usr/local/jail/bin/addjailsw /var/chroot/
 
或
 
[root@rrd src]# /usr/local/jail/bin/addjailsw /var/chroot/ -D
 
或
 
[root@rrd src]# /usr/local/jail/bin/addjailsw /var/chroot/ -P bash “–version”
 
addjailsw
 
A component of Jail (version 1.9 for linux)
 
http://www.jmcresearch.com/projects/jail/
 
Juan M. Casillas <juanm.casillas@jmcresearch.com>
 
Guessing mv args()
 
Guessing ls args()
 
Guessing ln args()
 
Guessing grep args()
 
Guessing cat args()
 
Guessing rmdir args()
 
Guessing vi args(-c q)
 
Guessing tail args()
 
Guessing sh args()
 
Guessing id args()
 
Guessing rm args()
 
Guessing head args()
 
Guessing cp args()
 
Guessing pwd args()
 
Guessing mkdir args()
 
Guessing touch args()
 
Guessing more args()
 
还记得这步吧！所以chroot /var/chroot/后的bash-3.2#运行命令是有限的
 
bash-3.2# whoami##就算是root用户执行的命令也是有限的
 
root