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/* Copyright (C) 1991-2021 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#include <hurd.h>
#include <hurd/msg_server.h>
#include <hurd/id.h>
#include <string.h>
int
_hurd_refport_secure_p (mach_port_t ref)
{
if (ref == __mach_task_self ())
return 1;
if (__USEPORT (AUTH, ref == port))
return 1;
return 0;
}
kern_return_t
_S_msg_add_auth (mach_port_t me,
auth_t addauth)
{
error_t err;
auth_t newauth;
uid_t *genuids, *gengids, *auxuids, *auxgids;
mach_msg_type_number_t ngenuids, ngengids, nauxuids, nauxgids;
uid_t *newgenuids, *newgengids, *newauxuids, *newauxgids;
mach_msg_type_number_t nnewgenuids, nnewgengids, nnewauxuids, nnewauxgids;
/* Create a list of ids and store it in NEWLISTP, length NEWLISTLEN.
Keep all the ids in EXIST (len NEXIST), adding in those from NEW
(len NNEW) which are not already there. */
error_t make_list (uid_t **newlistp, mach_msg_type_number_t *newlistlen,
uid_t *exist, mach_msg_type_number_t nexist,
uid_t *new, mach_msg_type_number_t nnew)
{
error_t urp;
int i, j, k;
vm_size_t offset;
urp = __vm_allocate (mach_task_self (), (vm_address_t *) newlistp,
nexist + nnew * sizeof (uid_t), 1);
if (urp)
return urp;
j = 0;
for (i = 0; i < nexist; i++)
(*newlistp)[j++] = exist[i];
for (i = 0; i < nnew; i++)
{
for (k = 0; k < nexist; k++)
if (exist[k] == new[i])
break;
if (k < nexist)
continue;
(*newlistp)[j++] = new[i];
}
offset = (round_page (nexist + nnew * sizeof (uid_t))
- round_page (j * sizeof (uid_t)));
if (offset)
__vm_deallocate (mach_task_self (),
(vm_address_t) (*newlistp
+ (nexist + nnew * sizeof (uid_t))),
offset);
*newlistlen = j;
return 0;
}
/* Find out what ids ADDAUTH refers to */
genuids = gengids = auxuids = auxgids = 0;
ngenuids = ngengids = nauxuids = nauxgids = 0;
err = __auth_getids (addauth,
&genuids, &ngenuids,
&auxuids, &nauxuids,
&gengids, &ngengids,
&auxgids, &nauxgids);
if (err)
return err;
/* OR in these ids to what we already have, creating a new list. */
HURD_CRITICAL_BEGIN;
__mutex_lock (&_hurd_id.lock);
_hurd_check_ids ();
#define MAKE(genaux,uidgid) \
make_list (&new ## genaux ## uidgid ## s, \
&nnew ## genaux ## uidgid ## s, \
_hurd_id.genaux.uidgid ## s, \
_hurd_id.genaux.n ## uidgid ## s, \
genaux ## uidgid ## s, \
n ## genaux ## uidgid ## s)
err = MAKE (gen, uid);
if (!err)
MAKE (aux, uid);
if (!err)
MAKE (gen, gid);
if (!err)
MAKE (aux, gid);
#undef MAKE
__mutex_unlock (&_hurd_id.lock);
HURD_CRITICAL_END;
/* Create the new auth port */
if (!err)
err = __USEPORT (AUTH,
__auth_makeauth (port,
&addauth, MACH_MSG_TYPE_MOVE_SEND, 1,
newgenuids, nnewgenuids,
newauxuids, nnewauxuids,
newgengids, nnewgengids,
newauxgids, nnewauxgids,
&newauth));
#define freeup(array, len) \
if (array) \
__vm_deallocate (mach_task_self (), (vm_address_t) array, \
len * sizeof (uid_t));
freeup (genuids, ngenuids);
freeup (auxuids, nauxuids);
freeup (gengids, ngengids);
freeup (auxgids, nauxgids);
freeup (newgenuids, nnewgenuids);
freeup (newauxuids, nnewauxuids);
freeup (newgengids, nnewgengids);
freeup (newauxgids, nnewauxgids);
#undef freeup
if (err)
return err;
/* And install it. */
err = __setauth (newauth);
__mach_port_deallocate (__mach_task_self (), newauth);
if (err)
return errno;
return 0;
}
kern_return_t
_S_msg_del_auth (mach_port_t me,
task_t task,
intarray_t uids, mach_msg_type_number_t nuids,
intarray_t gids, mach_msg_type_number_t ngids)
{
error_t err;
auth_t newauth;
if (!_hurd_refport_secure_p (task))
return EPERM;
HURD_CRITICAL_BEGIN;
__mutex_lock (&_hurd_id.lock);
err = _hurd_check_ids ();
if (!err)
{
size_t i, j;
size_t nu = _hurd_id.gen.nuids, ng = _hurd_id.gen.ngids;
uid_t newu[nu];
gid_t newg[ng];
memcpy (newu, _hurd_id.gen.uids, nu * sizeof (uid_t));
memcpy (newg, _hurd_id.gen.gids, ng * sizeof (gid_t));
for (j = 0; j < nuids; ++j)
{
const uid_t uid = uids[j];
for (i = 0; i < nu; ++i)
if (newu[i] == uid)
/* Move the last uid into this slot, and decrease the
number of uids so the last slot is no longer used. */
newu[i] = newu[--nu];
}
__vm_deallocate (__mach_task_self (),
(vm_address_t) uids, nuids * sizeof (uid_t));
for (j = 0; j < ngids; ++j)
{
const gid_t gid = gids[j];
for (i = 0; i < nu; ++i)
if (newu[i] == gid)
/* Move the last gid into this slot, and decrease the
number of gids so the last slot is no longer used. */
newu[i] = newu[--nu];
}
__vm_deallocate (__mach_task_self (),
(vm_address_t) gids, ngids * sizeof (gid_t));
err = __USEPORT (AUTH, __auth_makeauth
(port,
NULL, MACH_MSG_TYPE_COPY_SEND, 0,
newu, nu,
_hurd_id.aux.uids, _hurd_id.aux.nuids,
newg, ng,
_hurd_id.aux.uids, _hurd_id.aux.ngids,
&newauth));
}
__mutex_unlock (&_hurd_id.lock);
HURD_CRITICAL_END;
if (err)
return err;
err = __setauth (newauth);
__mach_port_deallocate (__mach_task_self (), newauth);
if (err)
return errno;
return 0;
}
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