ref: 5622b0bbd878dbc34045cc6fd37cffa64461eabe
dir: /sys/src/libauth/auth_chuid.c/
#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("/dev/capuse", OCEXEC|OWRITE); if(fd < 0){ werrstr("opening /dev/capuse: %r"); return -1; } rv = write(fd, ai->cap, strlen(ai->cap)); close(fd); if(rv < 0){ werrstr("writing %s to /dev/capuse: %r", ai->cap); return -1; } /* get a link to factotum as new user */ fd = open("/srv/factotum", ORDWR); if(fd >= 0){ if(mount(fd, -1, "/mnt", MREPL, "") == -1) close(fd); } /* set up new namespace */ return newns(ai->cuid, ns); }