89 lines
2.8 KiB
C
89 lines
2.8 KiB
C
/* $NetBSD: sysv_ipc.c,v 1.12 1997/05/08 17:16:15 mycroft Exp $ */
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/*
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* Copyright (c) 1995 Charles M. Hannum. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by Charles M. Hannum.
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* 4. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/param.h>
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#include <sys/kernel.h>
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#include <sys/proc.h>
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#include <sys/ipc.h>
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#include <sys/systm.h>
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#include <sys/mount.h>
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#include <sys/vnode.h>
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#include <sys/stat.h>
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/*
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* Check for ipc permission
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*/
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int
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ipcperm(cred, perm, mode)
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struct ucred *cred;
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struct ipc_perm *perm;
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int mode;
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{
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mode_t mask;
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if (cred->cr_uid == 0)
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return (0);
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if (mode == IPC_M) {
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if (cred->cr_uid == perm->uid ||
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cred->cr_uid == perm->cuid)
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return (0);
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return (EPERM);
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}
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mask = 0;
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if (cred->cr_uid == perm->uid ||
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cred->cr_uid == perm->cuid) {
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if (mode & IPC_R)
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mask |= S_IRUSR;
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if (mode & IPC_W)
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mask |= S_IWUSR;
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return ((perm->mode & mask) == mask ? 0 : EACCES);
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}
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if (cred->cr_gid == perm->gid || groupmember(perm->gid, cred) ||
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cred->cr_gid == perm->cgid || groupmember(perm->cgid, cred)) {
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if (mode & IPC_R)
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mask |= S_IRGRP;
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if (mode & IPC_W)
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mask |= S_IWGRP;
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return ((perm->mode & mask) == mask ? 0 : EACCES);
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}
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if (mode & IPC_R)
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mask |= S_IROTH;
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if (mode & IPC_W)
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mask |= S_IWOTH;
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return ((perm->mode & mask) == mask ? 0 : EACCES);
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}
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