// On disposal, cease to be root.
public void Dispose()
{
setreuid(this.previousUid, this.previousUid);
setregid(this.previousGid, this.previousGid);
this.previousUid = 0;
this.previousGid = 0;
}
// Revert from root.
private static void Unrootify()
{
// if (previousUid == 0)
// throw new InvalidOperationException("Cannot unrootify unroot.");
setreuid(previousUid, previousUid);
setregid(previousGid, previousGid);
previousUid = 0;
previousGid = 0;
}
// Become root.
internal RootPrivilege()
{
this.previousUid = getuid();
this.previousGid = getgid();
setreuid(0, 0);
setregid(0, 0);
this.IsRoot = true;
}
// Revert from root.
private static void Unrootify()
{
if (previousUid == 0)
{
throw new InvalidOperationException("Cannot unrootify unroot.");
}
setuid(previousUid);
previousUid = 0;
}
// Become root.
private static void Rootify()
{
if (previousUid != 0)
{
throw new InvalidOperationException("Cannot rootify root.");
}
previousUid = getuid();
setuid(0);
}
internal static passwd getpwuid(uid_t uid)
{
var pwd = _getpwuid(uid);
if (pwd == IntPtr.Zero)
{
throw new NullReferenceException($"getpwuid returned null for uuid_t ({uid})");
}
return((passwd)Marshal.PtrToStructure(pwd, typeof(passwd)));
}
// Become root.
internal RootPrivilege()
{
if (getuid() == 0)
{
throw new InvalidOperationException("Cannot rootify root.");
}
this.previousUid = getuid();
this.previousGid = getgid();
setreuid(0, 0);
setregid(0, 0);
}
// Become root.
private static void Rootify()
{
if (previousUid != 0)
{
throw new InvalidOperationException("Cannot rootify root.");
}
previousUid = getuid();
previousGid = getgid();
setreuid(0, 0);
setregid(0, 0);
// Console.WriteLine ($"uid={getuid()} gid={getgid()} euid={geteuid()} egid={getegid()}");
}
private static extern IntPtr _getpwuid(uid_t uid);
public static extern int fchownat(int dirfd, byte *path, uid_t owner, gid_t group, int flags);
public static extern int lchown(byte *path, uid_t owner, gid_t group);
public static extern int fchown(int fd, uid_t owner, gid_t group);
public static extern int setresuid(uid_t ruid, uid_t euid, uid_t suid);
public static extern int seteuid(uid_t uid);