src/routers/rf_get_ugid.c

   1 /*************************************************
   2 *     Exim - an Internet mail transport agent    *
   3 *************************************************/
   4
   5 /* Copyright (c) University of Cambridge 1995 - 2009 */
   6 /* See the file NOTICE for conditions of use and distribution. */
   7
   8 #include "../exim.h"
   9 #include "rf_functions.h"
  10
  11
  12 /*************************************************
  13 *            Get uid/gid for a router            *
  14 *************************************************/
  15
  16 /* This function is called by routers to sort out the uid/gid values which are
  17 passed with an address for use by local transports.
  18
  19 Arguments:
  20   rblock       the router block
  21   addr         the address being worked on
  22   ugid         pointer to a ugid block to fill in
  23
  24 Returns:       TRUE if all goes well, else FALSE
  25 */
  26
  27 BOOL
  28 rf_get_ugid(router_instance *rblock, address_item *addr, ugid_block *ugid)
  29 {
  30 struct passwd *upw = NULL;
  31
  32 /* Initialize from fixed values */
  33
  34 ugid->uid = rblock->uid;
  35 ugid->gid = rblock->gid;
  36 ugid->uid_set = rblock->uid_set;
  37 ugid->gid_set = rblock->gid_set;
  38 ugid->initgroups = rblock->initgroups;
  39
  40 /* If there is no fixed uid set, see if there's a dynamic one that can
  41 be expanded and possibly looked up. */
  42
  43 if (!ugid->uid_set && rblock->expand_uid != NULL)
  44   {
  45   if (route_find_expanded_user(rblock->expand_uid, rblock->name, US"router",
  46     &upw, &(ugid->uid), &(addr->message))) ugid->uid_set = TRUE;
  47   else return FALSE;
  48   }
  49
  50 /* Likewise for the gid */
  51
  52 if (!ugid->gid_set && rblock->expand_gid != NULL)
  53   {
  54   if (route_find_expanded_group(rblock->expand_gid, rblock->name, US"router",
  55     &(ugid->gid), &(addr->message))) ugid->gid_set = TRUE;
  56   else return FALSE;
  57   }
  58
  59 /* If a uid is set, then a gid must also be available; use one from the passwd
  60 lookup if it happened. */
  61
  62 if (ugid->uid_set && !ugid->gid_set)
  63   {
  64   if (upw != NULL)
  65     {
  66     ugid->gid = upw->pw_gid;
  67     ugid->gid_set = TRUE;
  68     }
  69   else
  70     {
  71     addr->message = string_sprintf("user set without group for %s router",
  72       rblock->name);
  73     return FALSE;
  74     }
  75   }
  76
  77 return TRUE;
  78 }
  79
  80 /* End of rf_get_ugid.c */