1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 22 /* 23 * Copyright 2010 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27 /* Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T */ 28 /* All Rights Reserved */ 29 30 /* 31 * Portions of this source code were derived from Berkeley 4.3 BSD 32 * under license from the Regents of the University of California. 33 */ 34 35 #include <sys/param.h> 36 #include <sys/isa_defs.h> 37 #include <sys/types.h> 38 #include <sys/sysmacros.h> 39 #include <sys/systm.h> 40 #include <sys/errno.h> 41 #include <sys/fcntl.h> 42 #include <sys/pathname.h> 43 #include <sys/var.h> 44 #include <sys/vfs.h> 45 #include <sys/vnode.h> 46 #include <sys/file.h> 47 #include <sys/mode.h> 48 #include <sys/proc.h> 49 #include <sys/uio.h> 50 #include <sys/filio.h> 51 #include <sys/fcntl.h> 52 #include <sys/debug.h> 53 #include <c2/audit.h> 54 55 /* 56 * Change ownership of file. 57 */ 58 int 59 fchownat(int fd, char *name, uid_t uid, gid_t gid, int flags) 60 { 61 vnode_t *startvp, *vp; 62 file_t *filefp; 63 struct vattr vattr; 64 int error = 0; 65 char startchar; 66 struct zone *zone = crgetzone(CRED()); 67 68 if (uid != (uid_t)-1 && !VALID_UID(uid, zone) || 69 gid != (gid_t)-1 && !VALID_GID(gid, zone)) { 70 return (set_errno(EINVAL)); 71 } 72 vattr.va_uid = uid; 73 vattr.va_gid = gid; 74 vattr.va_mask = 0; 75 if (vattr.va_uid != -1) 76 vattr.va_mask |= AT_UID; 77 if (vattr.va_gid != -1) 78 vattr.va_mask |= AT_GID; 79 80 81 if (fd == AT_FDCWD && name == NULL) 82 return (set_errno(EFAULT)); 83 84 if (name != NULL) { 85 if (copyin(name, &startchar, sizeof (char))) 86 return (set_errno(EFAULT)); 87 } else { 88 startchar = '\0'; 89 } 90 91 92 if (fd == AT_FDCWD) 93 startvp = NULL; 94 else { 95 /* 96 * only get fd if not doing absolute lookup 97 */ 98 if (startchar != '/') { 99 if ((filefp = getf(fd)) == NULL) 100 return (set_errno(EBADF)); 101 startvp = filefp->f_vnode; 102 VN_HOLD(startvp); 103 releasef(fd); 104 } else { 105 startvp = NULL; 106 } 107 } 108 109 if (audit_active) 110 audit_setfsat_path(1); 111 112 /* 113 * Do lookup for fchownat when name not NULL 114 */ 115 if (name != NULL) { 116 if (error = lookupnameat(name, UIO_USERSPACE, 117 (flags == AT_SYMLINK_NOFOLLOW) ? 118 NO_FOLLOW : FOLLOW, 119 NULLVPP, &vp, startvp)) { 120 if (startvp != NULL) 121 VN_RELE(startvp); 122 return (set_errno(error)); 123 } 124 } else { 125 vp = startvp; 126 ASSERT(vp); 127 VN_HOLD(vp); 128 } 129 130 if (vn_is_readonly(vp)) { 131 error = EROFS; 132 } else { 133 error = VOP_SETATTR(vp, &vattr, 0, CRED(), NULL); 134 } 135 136 if (startvp != NULL) 137 VN_RELE(startvp); 138 if (vp != NULL) 139 VN_RELE(vp); 140 141 if (error != 0) 142 return (set_errno(error)); 143 else 144 return (error); 145 } 146 147 int 148 chown(char *fname, uid_t uid, gid_t gid) 149 { 150 return (fchownat(AT_FDCWD, fname, uid, gid, 0)); 151 } 152 153 int 154 lchown(char *fname, uid_t uid, gid_t gid) 155 { 156 return (fchownat(AT_FDCWD, fname, uid, gid, AT_SYMLINK_NOFOLLOW)); 157 } 158 159 int 160 fchown(int fd, uid_t uid, uid_t gid) 161 { 162 return (fchownat(fd, NULL, uid, gid, 0)); 163 } 164