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- /*
- * This file is part of the UCB release of Plan 9. It is subject to the license
- * terms in the LICENSE file found in the top-level directory of this
- * distribution and at http://akaros.cs.berkeley.edu/files/Plan9License. No
- * part of the UCB release of Plan 9, including this file, may be copied,
- * modified, propagated, or distributed except according to the terms contained
- * in the LICENSE file.
- */
- #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);
- }
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