FreeBSD/Linux Kernel Cross Reference
sys/netinet/in_prot.c
1 /*-
2 * Copyright (c) 2000-2001 Robert N. M. Watson.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 *
26 */
27
28 /*
29 * System calls related to processes and protection
30 */
31
32 #include <sys/cdefs.h>
33 __FBSDID("$FreeBSD: releng/12.0/sys/netinet/in_prot.c 332122 2018-04-06 17:35:35Z brooks $");
34
35 #include "opt_inet.h"
36 #include "opt_inet6.h"
37
38 #include <sys/param.h>
39 #include <sys/systm.h>
40 #include <sys/kernel.h>
41 #include <sys/lock.h>
42 #include <sys/mutex.h>
43 #include <sys/proc.h>
44 #include <sys/socket.h>
45 #include <sys/jail.h>
46
47 #include <netinet/in.h>
48 #include <netinet/in_pcb.h>
49 #include <netinet/in_systm.h>
50
51 #include <security/audit/audit.h>
52 #include <security/mac/mac_framework.h>
53
54 /*-
55 * Determine whether the subject represented by cred can "see" a socket.
56 * Returns: 0 for permitted, ENOENT otherwise.
57 */
58 int
59 cr_canseeinpcb(struct ucred *cred, struct inpcb *inp)
60 {
61 int error;
62
63 error = prison_check(cred, inp->inp_cred);
64 if (error)
65 return (ENOENT);
66 #ifdef MAC
67 INP_LOCK_ASSERT(inp);
68 error = mac_inpcb_check_visible(cred, inp);
69 if (error)
70 return (error);
71 #endif
72 if (cr_canseeotheruids(cred, inp->inp_cred))
73 return (ENOENT);
74 if (cr_canseeothergids(cred, inp->inp_cred))
75 return (ENOENT);
76
77 return (0);
78 }
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