blob: 6b3819e869a8db52d183853674f1966faae69380 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
|
#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] == 0){
werrstr("no capability");
return -1;
}
/* change uid */
fd = open("#¤/capuse", OWRITE|OCEXEC);
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|OCEXEC);
if(fd >= 0){
if(mount(fd, -1, "/mnt", MREPL, "") == -1)
close(fd);
}
/* set up new namespace */
return newns(ai->cuid, ns);
}
|
