src/src/routers/rf_get_ugid.c

   1 /* $Cambridge: exim/src/src/routers/rf_get_ugid.c,v 1.4 2007/01/08 10:50:20 ph10 Exp $ */
   2
   3 /*************************************************
   4 *     Exim - an Internet mail transport agent    *
   5 *************************************************/
   6
   7 /* Copyright (c) University of Cambridge 1995 - 2007 */
   8 /* See the file NOTICE for conditions of use and distribution. */
   9
  10 #include "../exim.h"
  11 #include "rf_functions.h"
  12
  13
  14 /*************************************************
  15 *            Get uid/gid for a router            *
  16 *************************************************/
  17
  18 /* This function is called by routers to sort out the uid/gid values which are
  19 passed with an address for use by local transports.
  20
  21 Arguments:
  22   rblock       the router block
  23   addr         the address being worked on
  24   ugid         pointer to a ugid block to fill in
  25
  26 Returns:       TRUE if all goes well, else FALSE
  27 */
  28
  29 BOOL
  30 rf_get_ugid(router_instance *rblock, address_item *addr, ugid_block *ugid)
  31 {
  32 struct passwd *upw = NULL;
  33
  34 /* Initialize from fixed values */
  35
  36 ugid->uid = rblock->uid;
  37 ugid->gid = rblock->gid;
  38 ugid->uid_set = rblock->uid_set;
  39 ugid->gid_set = rblock->gid_set;
  40 ugid->initgroups = rblock->initgroups;
  41
  42 /* If there is no fixed uid set, see if there's a dynamic one that can
  43 be expanded and possibly looked up. */
  44
  45 if (!ugid->uid_set && rblock->expand_uid != NULL)
  46   {
  47   if (route_find_expanded_user(rblock->expand_uid, rblock->name, US"router",
  48     &upw, &(ugid->uid), &(addr->message))) ugid->uid_set = TRUE;
  49   else return FALSE;
  50   }
  51
  52 /* Likewise for the gid */
  53
  54 if (!ugid->gid_set && rblock->expand_gid != NULL)
  55   {
  56   if (route_find_expanded_group(rblock->expand_gid, rblock->name, US"router",
  57     &(ugid->gid), &(addr->message))) ugid->gid_set = TRUE;
  58   else return FALSE;
  59   }
  60
  61 /* If a uid is set, then a gid must also be available; use one from the passwd
  62 lookup if it happened. */
  63
  64 if (ugid->uid_set && !ugid->gid_set)
  65   {
  66   if (upw != NULL)
  67     {
  68     ugid->gid = upw->pw_gid;
  69     ugid->gid_set = TRUE;
  70     }
  71   else
  72     {
  73     addr->message = string_sprintf("user set without group for %s router",
  74       rblock->name);
  75     return FALSE;
  76     }
  77   }
  78
  79 return TRUE;
  80 }
  81
  82 /* End of rf_get_ugid.c */