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glibc/hurd/hurdauth.c
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/* Copyright (C) 1991-2016 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 | |
<http://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; | |
} |