/* * CDDL HEADER START * * The contents of this file are subject to the terms of the * Common Development and Distribution License (the "License"). * You may not use this file except in compliance with the License. * * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE * or http://www.opensolaris.org/os/licensing. * See the License for the specific language governing permissions * and limitations under the License. * * When distributing Covered Code, include this CDDL HEADER in each * file and include the License file at usr/src/OPENSOLARIS.LICENSE. * If applicable, add the following below this CDDL HEADER, with the * fields enclosed by brackets "[]" replaced with your own identifying * information: Portions Copyright [yyyy] [name of copyright owner] * * CDDL HEADER END */ /* * Copyright 2010 Sun Microsystems, Inc. All rights reserved. * Use is subject to license terms. */ /* Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T */ /* All Rights Reserved */ /* * Portions of this source code were derived from Berkeley 4.3 BSD * under license from the Regents of the University of California. */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include /* * Determine accessibility of file. */ #define E_OK 010 /* use effective ids */ #define R_OK 004 #define W_OK 002 #define X_OK 001 static int caccess(char *fname, int fmode, vnode_t *startvp) { vnode_t *vp; cred_t *tmpcr; int error; int mode; int eok; cred_t *cr; int estale_retry = 0; if (fmode & ~(E_OK|R_OK|W_OK|X_OK)) return (set_errno(EINVAL)); mode = ((fmode & (R_OK|W_OK|X_OK)) << 6); cr = CRED(); /* OK to use effective uid/gid, i.e., no need to crdup(CRED())? */ eok = (fmode & E_OK) || (cr->cr_uid == cr->cr_ruid && cr->cr_gid == cr->cr_rgid); if (eok) tmpcr = cr; else { tmpcr = crdup(cr); tmpcr->cr_uid = cr->cr_ruid; tmpcr->cr_gid = cr->cr_rgid; tmpcr->cr_ruid = cr->cr_uid; tmpcr->cr_rgid = cr->cr_gid; } lookup: if (error = lookupnameatcred(fname, UIO_USERSPACE, FOLLOW, NULLVPP, &vp, startvp, tmpcr)) { if ((error == ESTALE) && fs_need_estale_retry(estale_retry++)) goto lookup; if (!eok) crfree(tmpcr); return (set_errno(error)); } if (mode) { error = VOP_ACCESS(vp, mode, 0, tmpcr, NULL); if (error) { if ((error == ESTALE) && fs_need_estale_retry(estale_retry++)) { VN_RELE(vp); goto lookup; } (void) set_errno(error); } } if (!eok) crfree(tmpcr); VN_RELE(vp); return (error); } int faccessat(int fd, char *fname, int fmode, int flag) { file_t *dirfp; vnode_t *dirvp; int error; char startchar; if (fd == AT_FDCWD && fname == NULL) return (set_errno(EFAULT)); if ((flag & ~AT_EACCESS) != 0) return (set_errno(EINVAL)); if (fname != NULL) { if (copyin(fname, &startchar, sizeof (char))) return (set_errno(EFAULT)); } else startchar = '\0'; if (fd == AT_FDCWD) { dirvp = NULL; } else { if (startchar != '/') { if ((dirfp = getf(fd)) == NULL) { return (set_errno(EBADF)); } dirvp = dirfp->f_vnode; VN_HOLD(dirvp); releasef(fd); } else { dirvp = NULL; } } if (audit_active) audit_setfsat_path(1); /* Do not allow E_OK unless AT_EACCESS flag is set */ fmode &= ~E_OK; if (flag & AT_EACCESS) fmode |= E_OK; error = caccess(fname, fmode, dirvp); if (dirvp != NULL) VN_RELE(dirvp); return (error); } int access(char *fname, int fmode) { return (faccessat(AT_FDCWD, fname, fmode, 0)); }