Edward Bartolo <edb...@gmail.com> writes:
> I used:
>
> char* home = getenv("HOME");
>
> to get the user's home directory but got "/root" instead. The reason
> is backend has a setuid = 0. However, I need to get the unprivileged
> user home directory path. Does anyone know of a solution?
A setuid program will have its so-called 'effective user-id' set to the
owner of the file but the so-called 'real user-id' will remain the
user-id of the invoking user.
--------
#include <pwd.h>
#include <stdio.h>
#include <unistd.h>
int main(void)
{
struct passwd *pwd;
/* home directory of 'real user' */
pwd = getpwuid(getuid());
puts(pwd->pw_dir);
/* home directory of 'effective user', ie, root */
pwd = getpwuid(geteuid());
puts(pwd->pw_dir);
return 0;
}
---------
When compiling this, making the resulting file root-owned and setting
the setuid bit, executing the program will print the 'real user' home
directory, followed by the root home directory.
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