Learn c before learning a period of PHP, which need to use PHP to run the root command, has not been the result, until one day to search for super this plugin.
As the days of learning C are much more. Find that you can use the C language to wrap external commands to run. Experiment a bit. Success.
You do not need any external tools to implement the root command in PHP.
Platform: Linux. Experimental command iptables The current directory is/var/www/html/http
Use the root user when writing programs
Everyone knows that iptables non-root users cannot run.
First, write a C program.
Named as: ipt.c
[CODE]
#include
#include
#include
#include
int main ()
{
uid_t uid, euid;
UID = Getuid ();
Euid = Geteuid ();
printf ("My UID:%u", getuid ()); This shows that the current UID can be commented out.
printf ("My euid:%u", geteuid ()); This shows the current euid.
if (Setreuid (Euid, UID))//Exchange these two IDs
Perror ("Setreuid");
printf ("After Setreuid uid:%u", getuid ());
printf ("Afer sertreuid Euid:%u", geteuid ());
System ("/sbin/iptables-l"); Execute iptables-l command
return 0;
}
[/code]
Compile the file Gcc-o ipt-wall ipt.c
Generate the IPT executable file under this path.
If the IPT is now invoked on a PHP page, it will not work even if it is setreuid.
The next thing to do is chmod u+s./ipt
LS a bit
-rwsr-xr-x 1 root root 5382 Jul 2 21:45 IPT
The s bit is already set up.
Then write a PHP page to invoke it.
[CODE]
Echo
Echo
Last line of the output:. $last _line.
Return value:. $retval;
?>
[/code]
Browse in the browser.
[Color=red] Chain INPUT (Policy ACCEPT)
Target Prot opt source destination
Chain FORWARD (Policy DROP)
Target Prot opt source destination
ACCEPT all – anywhere anywhere state related,established
Chain OUTPUT (Policy ACCEPT)
Target prot opt source destination [/color]
[Color=blue]my uid:48
My euid:0
After Setreuid uid:0
Afer Sertreuid Euid:48[/color]
--------------------------------------------------------------------------------
Last line of the Output:afer Sertreuid euid:48
--------------------------------------------------------------------------------
Return value:0
The command executed successfully:
It is well known that Apache has a UID of 48. After calling Setreuid, the valid user ID is swapped with the actual user ID. (Must be in the case of chmod u+s) The current UID of Apache is 0 so that the root command can be executed.
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