Simulating a hacker attack

[Daniel J Walsh]

pedro esteban wrote:

>>Ok here is how I have simulated what you are trying to do.
>>
>>cp /bin/sh /var/www/httpdsh
>>chcon -t httpd_exec_t /var/www/httpdsh
>>
>>Add the following lines to
>>/etc/selinux/targeted/src/policy/domains/misc/local.te
>>
>>
>>domain_auto_trans(unconfined_t,httpd_exec_t, httpd_t)
>>allow httpd_t devpts_t:chr_file rw_file_perms;
>>
>>cd /etc/selinux/targeted/src/policy/
>>make load
>>setsebool httpd_tty_comm=1
>>
>>Then run
>>/var/www/httpdsh
>>as root.
>>
>> /var/www/httpdsh
>>httpdsh: /root/.bashrc: Permission denied
>># id
>>uid=0(root) gid=0(root)
>>groups=0(root),1(bin),2(daemon),3(sys),4(adm),6(disk),10(wheel)
>>context=root:system_r:httpd_t:s0-s0:c0.c127
>># cat /etc/shadow
>>cat: /etc/shadow: Permission denied
>># cat /var/log/messages
>>cat: /var/log/messages: Permission denied
>>
>>    
>>
>
>Ok, thx for the lines. It works fine when im in Xmode (xterm), but
>when i change to console mode (tty1) if i execute /var/www/httpdsh it
>doesnot work. Its like if i dont execute the program. I dont get to
>the httpd bash. I dont receive any message in the console. I dont
>receive any message in /var/log/message. I dont receive any message in
>/var/log/audit/audit.log. Its like if it had not done anything
>
>What happen?
>  
>
You need to add getattr and ioctl to your tty.  I am adding it to Policy.

You could add

allow httpd_t tty_device_t:chr_file { getattr ioctl };

to local.te


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