1: /* Copyright (C) 1991, 92, 93, 94, 95, 96, 97 Free Software Foundation, Inc.
    2:    This file is part of the GNU C Library.
    3: 
    4:    The GNU C Library is free software; you can redistribute it and/or
    5:    modify it under the terms of the GNU Lesser General Public
    6:    License as published by the Free Software Foundation; either
    7:    version 2.1 of the License, or (at your option) any later version.
    8: 
    9:    The GNU C Library is distributed in the hope that it will be useful,
   10:    but WITHOUT ANY WARRANTY; without even the implied warranty of
   11:    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   12:    Lesser General Public License for more details.
   13: 
   14:    You should have received a copy of the GNU Lesser General Public
   15:    License along with the GNU C Library; if not, write to the Free
   16:    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
   17:    02111-1307 USA.  */
   18: 
   19: #include <hurd.h>
   20: #include <hurd/port.h>
   21: #include <hurd/id.h>
   22: #include "set-hooks.h"
   23: 
   24: /* Things in the library which want to be run when the auth port changes.  */
   25: DEFINE_HOOK (_hurd_reauth_hook, (auth_t new_auth));
   26: 
   27: #include <cthreads.h>
   28: static struct mutex reauth_lock = MUTEX_INITIALIZER;
   29: 
   30: 
   31: /* Set the auth port to NEW, and reauthenticate
   32:    everything used by the library.  */
   33: error_t
   34: _hurd_setauth (auth_t new)
   35: {
   36:   error_t err;
   37:   unsigned int d;
   38:   mach_port_t newport, ref;
   39: 
   40:   /* Give the new send right a user reference.
   41:      This is a good way to check that it is valid.  */
   42:   if (err = __mach_port_mod_refs (__mach_task_self (), new,
   43:                                   MACH_PORT_RIGHT_SEND, 1))
   44:     return err;
   45: 
   46:   HURD_CRITICAL_BEGIN;
   47: 
   48:   /* We lock against another thread doing setauth.  Anyone who sets
   49:      _hurd_ports[INIT_PORT_AUTH] some other way is asking to lose.  */
   50:   __mutex_lock (&reauth_lock);
   51: 
   52:   /* Install the new port in the cell.  */
   53:   __mutex_lock (&_hurd_id.lock);
   54:   _hurd_port_set (&_hurd_ports[INIT_PORT_AUTH], new);
   55:   _hurd_id.valid = 0;
   56:   if (_hurd_id.rid_auth)
   57:     {
   58:       __mach_port_deallocate (__mach_task_self (), _hurd_id.rid_auth);
   59:       _hurd_id.rid_auth = MACH_PORT_NULL;
   60:     }
   61:   __mutex_unlock (&_hurd_id.lock);
   62: 
   63:   if (_hurd_init_dtable != NULL)
   64:     /* We just have the simple table we got at startup.
   65:        Otherwise, a reauth_hook in dtable.c takes care of this.  */
   66:     for (d = 0; d < _hurd_init_dtablesize; ++d)
   67:       if (_hurd_init_dtable[d] != MACH_PORT_NULL)
   68:         {
   69:           mach_port_t new;
   70:           ref = __mach_reply_port ();
   71:           if (! __io_reauthenticate (_hurd_init_dtable[d],
   72:                                      ref, MACH_MSG_TYPE_MAKE_SEND) &&
   73:               ! HURD_PORT_USE (&_hurd_ports[INIT_PORT_AUTH],
   74:                                __auth_user_authenticate
   75:                                (port,
   76:                                 ref, MACH_MSG_TYPE_MAKE_SEND,
   77:                                 &new)))
   78:             {
   79:               __mach_port_deallocate (__mach_task_self (),
   80:                                       _hurd_init_dtable[d]);
   81:               _hurd_init_dtable[d] = new;
   82:             }
   83:           __mach_port_destroy (__mach_task_self (), ref);
   84:         }
   85: 
   86:   ref = __mach_reply_port ();
   87:   if (__USEPORT (CRDIR,
   88:                  ! __io_reauthenticate (port,
   89:                                         ref, MACH_MSG_TYPE_MAKE_SEND) &&
   90:                  ! __auth_user_authenticate (new,
   91:                                              ref, MACH_MSG_TYPE_MAKE_SEND,
   92:                                              &newport)))
   93:     _hurd_port_set (&_hurd_ports[INIT_PORT_CRDIR], newport);
   94:   __mach_port_destroy (__mach_task_self (), ref);
   95: 
   96:   ref = __mach_reply_port ();
   97:   if (__USEPORT (CWDIR,
   98:                  ! __io_reauthenticate (port,
   99:                                         ref, MACH_MSG_TYPE_MAKE_SEND) &&
  100:                  ! __auth_user_authenticate (new,
  101:                                              ref, MACH_MSG_TYPE_MAKE_SEND,
  102:                                              &newport)))
  103:     _hurd_port_set (&_hurd_ports[INIT_PORT_CWDIR], newport);
  104:   __mach_port_destroy (__mach_task_self (), ref);
  105: 
  106:   /* Run things which want to do reauthorization stuff.  */
  107:   RUN_HOOK (_hurd_reauth_hook, (new));
  108: 
  109:   __mutex_unlock (&reauth_lock);
  110: 
  111:   HURD_CRITICAL_END;
  112: 
  113:   return 0;
  114: }
  115: 
  116: int
  117: __setauth (auth_t new)
  118: {
  119:   error_t err = _hurd_setauth (new);
  120:   return err ? __hurd_fail (err) : 0;
  121: }
  122: 
  123: weak_alias (__setauth, setauth)