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, Version 1.0 only 6 * (the "License"). You may not use this file except in compliance 7 * with the License. 8 * 9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10 * or http://www.opensolaris.org/os/licensing. 11 * See the License for the specific language governing permissions 12 * and limitations under the License. 13 * 14 * When distributing Covered Code, include this CDDL HEADER in each 15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16 * If applicable, add the following below this CDDL HEADER, with the 17 * fields enclosed by brackets "[]" replaced with your own identifying 18 * information: Portions Copyright [yyyy] [name of copyright owner] 19 * 20 * CDDL HEADER END 21 */ 22 /* 23 * Copyright 2004 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 #pragma ident "%Z%%M% %I% %E% SMI" 36 37 #include <sys/param.h> 38 #include <sys/isa_defs.h> 39 #include <sys/types.h> 40 #include <sys/sysmacros.h> 41 #include <sys/systm.h> 42 #include <sys/errno.h> 43 #include <sys/fcntl.h> 44 #include <sys/pathname.h> 45 #include <sys/var.h> 46 #include <sys/vfs.h> 47 #include <sys/vnode.h> 48 #include <sys/file.h> 49 #include <sys/mode.h> 50 #include <sys/proc.h> 51 #include <sys/uio.h> 52 #include <sys/filio.h> 53 #include <sys/fcntl.h> 54 #include <sys/debug.h> 55 #include <c2/audit.h> 56 57 /* 58 * nmflag has the following values 59 * 60 * 1 - Always do lookup. i.e. chown, lchown. 61 * 2 - Name is optional i.e. fchownat 62 * 0 - Don't lookup name, vp is in file_p. i.e. fchown 63 * 64 */ 65 int 66 cfchownat(int fd, char *name, int nmflag, uid_t uid, gid_t gid, int flags) 67 { 68 vnode_t *startvp, *vp; 69 file_t *filefp; 70 struct vattr vattr; 71 int error = 0; 72 char startchar; 73 74 if (uid < -1 || uid > MAXUID || gid < -1 || gid > MAXUID) 75 return (set_errno(EINVAL)); 76 vattr.va_uid = uid; 77 vattr.va_gid = gid; 78 vattr.va_mask = 0; 79 if (vattr.va_uid != -1) 80 vattr.va_mask |= AT_UID; 81 if (vattr.va_gid != -1) 82 vattr.va_mask |= AT_GID; 83 84 85 if (fd == AT_FDCWD && name == NULL) 86 return (set_errno(EFAULT)); 87 88 if (nmflag == 1 || (nmflag == 2 && name != NULL)) { 89 if (copyin(name, &startchar, sizeof (char))) 90 return (set_errno(EFAULT)); 91 } else 92 startchar = '\0'; 93 94 95 if (fd == AT_FDCWD) 96 startvp = NULL; 97 else { 98 /* 99 * only get fd if not doing absolute lookup 100 */ 101 if (startchar != '/' || nmflag == 0) { 102 if ((filefp = getf(fd)) == NULL) { 103 return (set_errno(EBADF)); 104 } 105 startvp = filefp->f_vnode; 106 VN_HOLD(startvp); 107 releasef(fd); 108 } else { 109 startvp = NULL; 110 } 111 } 112 113 #if C2_AUDIT 114 if ((nmflag == 2) && audit_active) 115 audit_setfsat_path(1); 116 #endif /* C2_AUDIT */ 117 118 /* 119 * Do lookups for chown, lchown and fchownat when name not NULL 120 */ 121 if ((nmflag == 2 && name != NULL) || nmflag == 1) { 122 if (error = lookupnameat(name, UIO_USERSPACE, 123 (flags == AT_SYMLINK_NOFOLLOW) ? 124 NO_FOLLOW : FOLLOW, 125 NULLVPP, &vp, startvp)) { 126 if (startvp != NULL) 127 VN_RELE(startvp); 128 return (set_errno(error)); 129 } 130 } else { 131 vp = startvp; 132 ASSERT(vp); 133 VN_HOLD(vp); 134 } 135 136 if (vn_is_readonly(vp)) { 137 error = EROFS; 138 } else { 139 error = VOP_SETATTR(vp, &vattr, 0, CRED(), NULL); 140 } 141 142 if (startvp != NULL) 143 VN_RELE(startvp); 144 if (vp != NULL) 145 VN_RELE(vp); 146 147 if (error != 0) 148 return (set_errno(error)); 149 else 150 return (error); 151 } 152 /* 153 * Change ownership of file given file name. 154 */ 155 int 156 chown(char *fname, uid_t uid, gid_t gid) 157 { 158 return (cfchownat(AT_FDCWD, fname, 1, uid, gid, 0)); 159 } 160 161 int 162 lchown(char *fname, uid_t uid, gid_t gid) 163 { 164 return (cfchownat(AT_FDCWD, fname, 1, uid, gid, AT_SYMLINK_NOFOLLOW)); 165 } 166 167 /* 168 * Change ownership of file given file descriptor. 169 */ 170 int 171 fchown(int fd, uid_t uid, uid_t gid) 172 { 173 return (cfchownat(fd, NULL, 0, uid, gid, 0)); 174 } 175 176 int 177 fchownat(int fd, char *name, uid_t uid, gid_t gid, int flags) 178 { 179 return (cfchownat(fd, name, 2, uid, gid, flags)); 180 181 } 182