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 #include "opt_inet.h"
  34 #include "opt_inet6.h"
  35
  36 #include <sys/param.h>
  37 #include <sys/systm.h>
  38 #include <sys/kernel.h>
  39 #include <sys/lock.h>
  40 #include <sys/mutex.h>
  41 #include <sys/proc.h>
  42 #include <sys/socket.h>
  43 #include <sys/jail.h>
  44
  45 #include <netinet/in.h>
  46 #include <netinet/in_pcb.h>
  47 #include <netinet/in_systm.h>
  48
  49 #include <security/audit/audit.h>
  50 #include <security/mac/mac_framework.h>
  51
  52 /*-
  53  * Determine whether the subject represented by cred can "see" a socket.
  54  * Returns: 0 for permitted, ENOENT otherwise.
  55  */
  56 int
  57 cr_canseeinpcb(struct ucred *cred, struct inpcb *inp)
  58 {
  59         int error;
  60
  61         error = prison_check(cred, inp->inp_cred);
  62         if (error)
  63                 return (ENOENT);
  64 #ifdef MAC
  65         INP_LOCK_ASSERT(inp);
  66         error = mac_inpcb_check_visible(cred, inp);
  67         if (error)
  68                 return (error);
  69 #endif
  70         if (cr_bsd_visible(cred, inp->inp_cred))
  71                 return (ENOENT);
  72
  73         return (0);
  74 }