run my cgi as root using setreuid failing

HarryBoy · 11-16-2010, 12:01 PM

I'm calling a cgi-script on an apache webserver. The script needs to create a textfile and write certain values into it.

When I do:

Code:

static const std::string outputFile( "/flash/myfile.ini" );
std::fstream fileStr( outputFile.c_str(), ( std::fstream::out | std::fstream::trunc ) );

if( !fileStr.is_open() )
{
	throw std::runtime_error( "Failed to open config file." );
}

The runtime error is always thrown.

So I wish to run this cgi as root by doing this:

Code:

if( 0 != ::setreuid(0, -1) )
{
	throw std::runtime_error( "Failed to set root user." );
}

But this also fails??

What is going wrong with setreuid??

devnull10 · 11-16-2010, 01:25 PM

What user is the cgi script running as, what groups is that user a member of and what are the permissions on the directory into which you are writing the file, and also on the file itself.