The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/netinet/in_prot.c

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    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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