1*0Sstevel@tonic-gate /* 2*0Sstevel@tonic-gate * CDDL HEADER START 3*0Sstevel@tonic-gate * 4*0Sstevel@tonic-gate * The contents of this file are subject to the terms of the 5*0Sstevel@tonic-gate * Common Development and Distribution License, Version 1.0 only 6*0Sstevel@tonic-gate * (the "License"). You may not use this file except in compliance 7*0Sstevel@tonic-gate * with the License. 8*0Sstevel@tonic-gate * 9*0Sstevel@tonic-gate * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10*0Sstevel@tonic-gate * or http://www.opensolaris.org/os/licensing. 11*0Sstevel@tonic-gate * See the License for the specific language governing permissions 12*0Sstevel@tonic-gate * and limitations under the License. 13*0Sstevel@tonic-gate * 14*0Sstevel@tonic-gate * When distributing Covered Code, include this CDDL HEADER in each 15*0Sstevel@tonic-gate * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16*0Sstevel@tonic-gate * If applicable, add the following below this CDDL HEADER, with the 17*0Sstevel@tonic-gate * fields enclosed by brackets "[]" replaced with your own identifying 18*0Sstevel@tonic-gate * information: Portions Copyright [yyyy] [name of copyright owner] 19*0Sstevel@tonic-gate * 20*0Sstevel@tonic-gate * CDDL HEADER END 21*0Sstevel@tonic-gate */ 22*0Sstevel@tonic-gate /* 23*0Sstevel@tonic-gate * Copyright 2003 Sun Microsystems, Inc. All rights reserved. 24*0Sstevel@tonic-gate * Use is subject to license terms. 25*0Sstevel@tonic-gate */ 26*0Sstevel@tonic-gate 27*0Sstevel@tonic-gate /* Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T */ 28*0Sstevel@tonic-gate /* All Rights Reserved */ 29*0Sstevel@tonic-gate 30*0Sstevel@tonic-gate /* 31*0Sstevel@tonic-gate * Portions of this source code were derived from Berkeley 4.3 BSD 32*0Sstevel@tonic-gate * under license from the Regents of the University of California. 33*0Sstevel@tonic-gate */ 34*0Sstevel@tonic-gate 35*0Sstevel@tonic-gate #pragma ident "%Z%%M% %I% %E% SMI" 36*0Sstevel@tonic-gate 37*0Sstevel@tonic-gate #include <sys/param.h> 38*0Sstevel@tonic-gate #include <sys/isa_defs.h> 39*0Sstevel@tonic-gate #include <sys/types.h> 40*0Sstevel@tonic-gate #include <sys/sysmacros.h> 41*0Sstevel@tonic-gate #include <sys/cred_impl.h> 42*0Sstevel@tonic-gate #include <sys/systm.h> 43*0Sstevel@tonic-gate #include <sys/errno.h> 44*0Sstevel@tonic-gate #include <sys/pathname.h> 45*0Sstevel@tonic-gate #include <sys/vnode.h> 46*0Sstevel@tonic-gate #include <sys/uio.h> 47*0Sstevel@tonic-gate #include <sys/cmn_err.h> 48*0Sstevel@tonic-gate #include <sys/debug.h> 49*0Sstevel@tonic-gate 50*0Sstevel@tonic-gate /* 51*0Sstevel@tonic-gate * Determine accessibility of file. 52*0Sstevel@tonic-gate */ 53*0Sstevel@tonic-gate 54*0Sstevel@tonic-gate #define E_OK 010 /* use effective ids */ 55*0Sstevel@tonic-gate #define R_OK 004 56*0Sstevel@tonic-gate #define W_OK 002 57*0Sstevel@tonic-gate #define X_OK 001 58*0Sstevel@tonic-gate 59*0Sstevel@tonic-gate int 60*0Sstevel@tonic-gate access(char *fname, int fmode) 61*0Sstevel@tonic-gate { 62*0Sstevel@tonic-gate vnode_t *vp; 63*0Sstevel@tonic-gate cred_t *tmpcr; 64*0Sstevel@tonic-gate int error; 65*0Sstevel@tonic-gate int mode; 66*0Sstevel@tonic-gate int eok; 67*0Sstevel@tonic-gate cred_t *cr; 68*0Sstevel@tonic-gate 69*0Sstevel@tonic-gate if (fmode & ~(E_OK|R_OK|W_OK|X_OK)) 70*0Sstevel@tonic-gate return (set_errno(EINVAL)); 71*0Sstevel@tonic-gate 72*0Sstevel@tonic-gate mode = ((fmode & (R_OK|W_OK|X_OK)) << 6); 73*0Sstevel@tonic-gate 74*0Sstevel@tonic-gate cr = CRED(); 75*0Sstevel@tonic-gate 76*0Sstevel@tonic-gate /* OK to use effective uid/gid, i.e., no need to crdup(CRED())? */ 77*0Sstevel@tonic-gate eok = (fmode & E_OK) || 78*0Sstevel@tonic-gate (cr->cr_uid == cr->cr_ruid && cr->cr_gid == cr->cr_rgid); 79*0Sstevel@tonic-gate 80*0Sstevel@tonic-gate if (eok) 81*0Sstevel@tonic-gate tmpcr = cr; 82*0Sstevel@tonic-gate else { 83*0Sstevel@tonic-gate tmpcr = crdup(cr); 84*0Sstevel@tonic-gate tmpcr->cr_uid = cr->cr_ruid; 85*0Sstevel@tonic-gate tmpcr->cr_gid = cr->cr_rgid; 86*0Sstevel@tonic-gate tmpcr->cr_ruid = cr->cr_uid; 87*0Sstevel@tonic-gate tmpcr->cr_rgid = cr->cr_gid; 88*0Sstevel@tonic-gate } 89*0Sstevel@tonic-gate 90*0Sstevel@tonic-gate lookup: 91*0Sstevel@tonic-gate if (error = lookupname(fname, UIO_USERSPACE, FOLLOW, NULLVPP, &vp)) { 92*0Sstevel@tonic-gate if (error == ESTALE) 93*0Sstevel@tonic-gate goto lookup; 94*0Sstevel@tonic-gate if (!eok) 95*0Sstevel@tonic-gate crfree(tmpcr); 96*0Sstevel@tonic-gate return (set_errno(error)); 97*0Sstevel@tonic-gate } 98*0Sstevel@tonic-gate 99*0Sstevel@tonic-gate if (mode) { 100*0Sstevel@tonic-gate error = VOP_ACCESS(vp, mode, 0, tmpcr); 101*0Sstevel@tonic-gate if (error) { 102*0Sstevel@tonic-gate if (error == ESTALE) { 103*0Sstevel@tonic-gate VN_RELE(vp); 104*0Sstevel@tonic-gate goto lookup; 105*0Sstevel@tonic-gate } 106*0Sstevel@tonic-gate (void) set_errno(error); 107*0Sstevel@tonic-gate } 108*0Sstevel@tonic-gate } 109*0Sstevel@tonic-gate 110*0Sstevel@tonic-gate if (!eok) 111*0Sstevel@tonic-gate crfree(tmpcr); 112*0Sstevel@tonic-gate VN_RELE(vp); 113*0Sstevel@tonic-gate return (error); 114*0Sstevel@tonic-gate } 115