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 (c) 1994, 2010, Oracle and/or its affiliates. All rights reserved. 24 */ 25 26 /* Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T */ 27 /* All Rights Reserved */ 28 29 /* 30 * Portions of this source code were derived from Berkeley 4.3 BSD 31 * under license from the Regents of the University of California. 32 */ 33 34 #include <sys/param.h> 35 #include <sys/isa_defs.h> 36 #include <sys/types.h> 37 #include <sys/sysmacros.h> 38 #include <sys/systm.h> 39 #include <sys/errno.h> 40 #include <sys/fcntl.h> 41 #include <sys/pathname.h> 42 #include <sys/var.h> 43 #include <sys/vfs.h> 44 #include <sys/vnode.h> 45 #include <sys/file.h> 46 #include <sys/mode.h> 47 #include <sys/proc.h> 48 #include <sys/uio.h> 49 #include <sys/filio.h> 50 #include <sys/fcntl.h> 51 #include <sys/debug.h> 52 #include <c2/audit.h> 53 54 /* 55 * Change ownership of file. 56 */ 57 int 58 fchownat(int fd, char *name, uid_t uid, gid_t gid, int flags) 59 { 60 vnode_t *startvp, *vp; 61 file_t *filefp; 62 struct vattr vattr; 63 int error = 0; 64 char startchar; 65 struct zone *zone = crgetzone(CRED()); 66 67 if (uid != (uid_t)-1 && !VALID_UID(uid, zone) || 68 gid != (gid_t)-1 && !VALID_GID(gid, zone)) { 69 return (set_errno(EINVAL)); 70 } 71 vattr.va_uid = uid; 72 vattr.va_gid = gid; 73 vattr.va_mask = 0; 74 if (vattr.va_uid != -1) 75 vattr.va_mask |= AT_UID; 76 if (vattr.va_gid != -1) 77 vattr.va_mask |= AT_GID; 78 79 80 if (fd == AT_FDCWD && name == NULL) 81 return (set_errno(EFAULT)); 82 83 if (name != NULL) { 84 if (copyin(name, &startchar, sizeof (char))) 85 return (set_errno(EFAULT)); 86 } else { 87 startchar = '\0'; 88 } 89 90 91 if (fd == AT_FDCWD) 92 startvp = NULL; 93 else { 94 /* 95 * only get fd if not doing absolute lookup 96 */ 97 if (startchar != '/') { 98 if ((filefp = getf(fd)) == NULL) 99 return (set_errno(EBADF)); 100 startvp = filefp->f_vnode; 101 VN_HOLD(startvp); 102 releasef(fd); 103 } else { 104 startvp = NULL; 105 } 106 } 107 108 if (AU_AUDITING() && (startvp != NULL)) 109 audit_setfsat_path(1); 110 111 /* 112 * Do lookup for fchownat when name not NULL 113 */ 114 if (name != NULL) { 115 if (error = lookupnameat(name, UIO_USERSPACE, 116 (flags == AT_SYMLINK_NOFOLLOW) ? 117 NO_FOLLOW : FOLLOW, 118 NULLVPP, &vp, startvp)) { 119 if (startvp != NULL) 120 VN_RELE(startvp); 121 return (set_errno(error)); 122 } 123 } else { 124 vp = startvp; 125 ASSERT(vp); 126 VN_HOLD(vp); 127 } 128 129 if (vn_is_readonly(vp)) { 130 error = EROFS; 131 } else { 132 error = VOP_SETATTR(vp, &vattr, 0, CRED(), NULL); 133 } 134 135 if (startvp != NULL) 136 VN_RELE(startvp); 137 if (vp != NULL) 138 VN_RELE(vp); 139 140 if (error != 0) 141 return (set_errno(error)); 142 else 143 return (error); 144 } 145 146 int 147 chown(char *fname, uid_t uid, gid_t gid) 148 { 149 return (fchownat(AT_FDCWD, fname, uid, gid, 0)); 150 } 151 152 int 153 lchown(char *fname, uid_t uid, gid_t gid) 154 { 155 return (fchownat(AT_FDCWD, fname, uid, gid, AT_SYMLINK_NOFOLLOW)); 156 } 157 158 int 159 fchown(int fd, uid_t uid, uid_t gid) 160 { 161 return (fchownat(fd, NULL, uid, gid, 0)); 162 } 163