Subversion Repositories planix.SVN

#include <u.h>
#include <libc.h>
#include <auth.h>

/*
 *  become the authenticated user
 */
int
auth_chuid(AuthInfo *ai, char *ns)
{
        int rv, fd;

        if(ai == nil || ai->cap == nil || *ai->cap == 0){
                werrstr("no capability");
                return -1;
        }

        /* change uid */
        fd = open("#¤/capuse", OWRITE);
        if(fd < 0){
                werrstr("opening #¤/capuse: %r");
                return -1;
        }
        rv = write(fd, ai->cap, strlen(ai->cap));
        close(fd);
        if(rv < 0){
                werrstr("writing %s to #¤/capuse: %r", ai->cap);
                return -1;
        }

        /* get a link to factotum as new user */
        fd = open("/srv/factotum", ORDWR);
        if(fd >= 0)
                mount(fd, -1, "/mnt", MREPL, "");

        /* set up new namespace */
        return newns(ai->cuid, ns);
}