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_canseeotheruids(cred, inp->inp_cred)) 71 return (ENOENT); 72 if (cr_canseeothergids(cred, inp->inp_cred)) 73 return (ENOENT); 74 75 return (0); 76 } 77