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
|
/*
Copyright (C) 1993, 1994, 1995, 1996 Free Software Foundation
This file is part of the GNU Hurd.
The GNU Hurd is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.
The GNU Hurd 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with the GNU Hurd; see the file COPYING. If not, write to
the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
/* Written by Michael I. Bushnell. */
#include "priv.h"
#include "io_S.h"
#include <string.h>
/* Tell if the array LIST (of size N) contains a member equal to QUERY. */
static inline int
listmember (int *list, int query, int n)
{
int i;
for (i = 0; i < n; i++)
if (list[i] == query)
return 1;
return 0;
}
kern_return_t
trivfs_S_io_restrict_auth (struct trivfs_protid *cred,
mach_port_t reply,
mach_msg_type_name_t replytype,
mach_port_t *newport,
mach_msg_type_name_t *newporttype,
uid_t *uids, u_int nuids,
uid_t *gids, u_int ngids)
{
int i;
error_t err = 0;
struct trivfs_protid *newcred;
struct idvec *uvec, *gvec;
struct iouser *user;
if (!cred)
return EOPNOTSUPP;
uvec = make_idvec ();
gvec = make_idvec ();
user = iohelp_create_iouser (uvec, gvec);
if (cred->isroot)
{
/* CRED has root access, and so may use any ids. */
idvec_set (uvec, uids, nuids);
idvec_set (gvec, gids, ngids);
}
else
{
/* Otherwise, use any of the requested ids that CRED already has. */
for (i = 0; i < cred->user->uids->num; i++)
if (listmember (uids, cred->user->uids->id[i], nuids))
idvec_add (uvec, cred->user->uids->ids[i]);
for (i = 0; i < cred->user->gids->num; i++)
if (listmember (gids, cred->user->gids->ids[i], ngids))
idvec_add (gvec, cred->user->gids->ids[i]);
}
err = ports_create_port (cred->po->cntl->protid_class,
cred->po->cntl->protid_bucket,
sizeof (struct trivfs_protid),
&newcred);
if (err)
{
iouser_free_iouser (user);
return err;
}
newcred->isroot = 0;
mutex_lock (&cred->po->cntl->lock);
newcred->po = cred->po;
newcred->po->refcnt++;
mutex_unlock (&cred->po->cntl->lock);
if (cred->isroot && idvec_contains (uvec, 0))
newcred->isroot = 1;
newcred->user = user;
newcred->hook = cred->hook;
err = io_restrict_auth (cred->realnode, &newcred->realnode,
user->uids->ids, user->uids->num,
user->gids->ids, user->gids->num);
if (!err && trivfs_protid_create_hook)
{
err = (*trivfs_protid_create_hook) (newcred);
if (err)
mach_port_deallocate (mach_task_self (), newcred->realnode);
}
if (err)
/* Signal that the user destroy hook shouldn't be called on NEWCRED. */
newcred->realnode = MACH_PORT_NULL;
else
{
*newport = ports_get_right (newcred);
*newporttype = MACH_MSG_TYPE_MAKE_SEND;
}
/* This will destroy NEWCRED if we got an error and didn't do the
ports_get_right above. */
ports_port_deref (newcred);
return 0;
}
|
