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 * Helpers related to visibility and protection of sockets and inpcb.
30 */
31
32 #include <sys/systm.h>
33 #include <sys/jail.h>
34 #include <sys/kernel.h>
35 #include <sys/lock.h>
36 #include <sys/mutex.h>
37 #include <sys/priv.h>
38 #include <sys/proc.h>
39 #include <sys/socket.h>
40
41 #include <netinet/in.h>
42 #include <netinet/in_pcb.h>
43 #include <netinet/in_systm.h>
44
45 #include <security/audit/audit.h>
46 #include <security/mac/mac_framework.h>
47
48 /*-
49 * Determine whether the subject represented by cred can "see" a socket.
50 * Returns: 0 for permitted, ENOENT otherwise.
51 */
52 int
cr_canseeinpcb(struct ucred * cred,struct inpcb * inp)53 cr_canseeinpcb(struct ucred *cred, struct inpcb *inp)
54 {
55 int error;
56
57 error = prison_check(cred, inp->inp_cred);
58 if (error)
59 return (ENOENT);
60 #ifdef MAC
61 INP_LOCK_ASSERT(inp);
62 error = mac_inpcb_check_visible(cred, inp);
63 if (error)
64 return (error);
65 #endif
66 if (cr_bsd_visible(cred, inp->inp_cred))
67 return (ENOENT);
68
69 return (0);
70 }
71
72 bool
cr_canexport_ktlskeys(struct thread * td,struct inpcb * inp)73 cr_canexport_ktlskeys(struct thread *td, struct inpcb *inp)
74 {
75 int error;
76
77 if (cr_canseeinpcb(td->td_ucred, inp) == 0 &&
78 cr_xids_subset(td->td_ucred, inp->inp_cred))
79 return (true);
80 error = priv_check(td, PRIV_NETINET_KTLSKEYS);
81 return (error == 0);
82
83 }
84