1 #include <u.h>
2 #include <libc.h>
3 #include <auth.h>
4
5 /*
6 * become the authenticated user
7 */
8 int
auth_chuid(AuthInfo * ai,char * ns)9 auth_chuid(AuthInfo *ai, char *ns)
10 {
11 int rv, fd;
12
13 if(ai == nil || ai->cap == nil || *ai->cap == 0){
14 werrstr("no capability");
15 return -1;
16 }
17
18 /* change uid */
19 fd = open("#¤/capuse", OWRITE);
20 if(fd < 0){
21 werrstr("opening #¤/capuse: %r");
22 return -1;
23 }
24 rv = write(fd, ai->cap, strlen(ai->cap));
25 close(fd);
26 if(rv < 0){
27 werrstr("writing %s to #¤/capuse: %r", ai->cap);
28 return -1;
29 }
30
31 /* get a link to factotum as new user */
32 fd = open("/srv/factotum", ORDWR);
33 if(fd >= 0)
34 mount(fd, -1, "/mnt", MREPL, "");
35
36 /* set up new namespace */
37 return newns(ai->cuid, ns);
38 }
39