1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
|
/* Copyright (C) 1991, 1992, 1993, 1994, 1995 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 Library General Public License as
published by the Free Software Foundation; either version 2 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB. If
not, write to the Free Software Foundation, Inc., 675 Mass Ave,
Cambridge, MA 02139, USA. */
#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;
if (err = __USEPORT (AUTH,
__auth_makeauth (port,
&addauth, 1, MACH_MSG_TYPE_MOVE_SEND,
NULL, 0,
NULL, 0,
NULL, 0,
NULL, 0,
&newauth)))
return err;
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, 0, MACH_MSG_TYPE_COPY_SEND,
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;
}
|
