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
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
|
/*
Copyright (C) 1993,94,95,96,2001,02 Free Software Foundation, Inc.
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 <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, size_t nuids,
uid_t *gids, size_t ngids)
{
int i;
error_t err;
struct trivfs_protid *newcred;
struct idvec *uvec, *gvec;
struct iouser *user;
if (!cred)
return EOPNOTSUPP;
if (cred->isroot)
/* CRED has root access, and so may use any ids. */
{
err = iohelp_create_complex_iouser (&user, uids, nuids, gids, ngids);
if (err)
return err;
}
else
{
uvec = make_idvec ();
if (! uvec)
return ENOMEM;
gvec = make_idvec ();
if (! gvec)
{
idvec_free (uvec);
return ENOMEM;
}
/* 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->ids[i], nuids))
{
err = idvec_add (uvec, cred->user->uids->ids[i]);
if (err)
goto out;
}
for (i = 0; i < cred->user->gids->num; i++)
if (listmember (gids, cred->user->gids->ids[i], ngids))
{
err = idvec_add (gvec, cred->user->gids->ids[i]);
if (err)
goto out;
}
err = iohelp_create_iouser (&user, uvec, gvec);
if (err)
{
out:
idvec_free (uvec);
idvec_free (gvec);
return err;
}
}
err = ports_create_port (cred->po->cntl->protid_class,
cred->po->cntl->protid_bucket,
sizeof (struct trivfs_protid),
&newcred);
if (err)
{
iohelp_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 (user->uids, 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;
}
|
