tauth_chuid.c - plan9port - [fork] Plan 9 from user space
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       ---
       tauth_chuid.c (669B)
       ---
            1 #include <u.h>
            2 #include <libc.h>
            3 #include <auth.h>
            4 
            5 /*
            6  *  become the authenticated user
            7  */
            8 int
            9 auth_chuid(AuthInfo *ai, char *ns)
           10 {
           11         int rv, fd;
           12 
           13         if(ai == nil || ai->cap == nil){
           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 }