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 * Copyright 2007 Sun Microsystems, Inc. All rights reserved. 23 * Use is subject to license terms. 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 #pragma ident "%Z%%M% %I% %E% SMI" 35 36 #include <sys/param.h> 37 #include <sys/isa_defs.h> 38 #include <sys/types.h> 39 #include <sys/sysmacros.h> 40 #include <sys/systm.h> 41 #include <sys/errno.h> 42 #include <sys/fcntl.h> 43 #include <sys/pathname.h> 44 #include <sys/var.h> 45 #include <sys/vfs.h> 46 #include <sys/vnode.h> 47 #include <sys/file.h> 48 #include <sys/mode.h> 49 #include <sys/proc.h> 50 #include <sys/uio.h> 51 #include <sys/filio.h> 52 #include <sys/fcntl.h> 53 #include <sys/debug.h> 54 #include <c2/audit.h> 55 56 /* 57 * nmflag has the following values 58 * 59 * 1 - Always do lookup. i.e. chown, lchown. 60 * 2 - Name is optional i.e. fchownat 61 * 0 - Don't lookup name, vp is in file_p. i.e. fchown 62 * 63 */ 64 int 65 cfchownat(int fd, char *name, int nmflag, uid_t uid, gid_t gid, int flags) 66 { 67 vnode_t *startvp, *vp; 68 file_t *filefp; 69 struct vattr vattr; 70 int error = 0; 71 char startchar; 72 73 if (uid != (uid_t)-1 && !VALID_UID(uid) || 74 gid != (gid_t)-1 && !VALID_GID(gid)) { 75 return (set_errno(EINVAL)); 76 } 77 vattr.va_uid = uid; 78 vattr.va_gid = gid; 79 vattr.va_mask = 0; 80 if (vattr.va_uid != -1) 81 vattr.va_mask |= AT_UID; 82 if (vattr.va_gid != -1) 83 vattr.va_mask |= AT_GID; 84 85 86 if (fd == AT_FDCWD && name == NULL) 87 return (set_errno(EFAULT)); 88 89 if (nmflag == 1 || (nmflag == 2 && name != NULL)) { 90 if (copyin(name, &startchar, sizeof (char))) 91 return (set_errno(EFAULT)); 92 } else 93 startchar = '\0'; 94 95 96 if (fd == AT_FDCWD) 97 startvp = NULL; 98 else { 99 /* 100 * only get fd if not doing absolute lookup 101 */ 102 if (startchar != '/' || nmflag == 0) { 103 if ((filefp = getf(fd)) == NULL) { 104 return (set_errno(EBADF)); 105 } 106 startvp = filefp->f_vnode; 107 VN_HOLD(startvp); 108 releasef(fd); 109 } else { 110 startvp = NULL; 111 } 112 } 113 114 #if C2_AUDIT 115 if ((nmflag == 2) && audit_active) 116 audit_setfsat_path(1); 117 #endif /* C2_AUDIT */ 118 119 /* 120 * Do lookups for chown, lchown and fchownat when name not NULL 121 */ 122 if ((nmflag == 2 && name != NULL) || nmflag == 1) { 123 if (error = lookupnameat(name, UIO_USERSPACE, 124 (flags == AT_SYMLINK_NOFOLLOW) ? 125 NO_FOLLOW : FOLLOW, 126 NULLVPP, &vp, startvp)) { 127 if (startvp != NULL) 128 VN_RELE(startvp); 129 return (set_errno(error)); 130 } 131 } else { 132 vp = startvp; 133 ASSERT(vp); 134 VN_HOLD(vp); 135 } 136 137 if (vn_is_readonly(vp)) { 138 error = EROFS; 139 } else { 140 error = VOP_SETATTR(vp, &vattr, 0, CRED(), NULL); 141 } 142 143 if (startvp != NULL) 144 VN_RELE(startvp); 145 if (vp != NULL) 146 VN_RELE(vp); 147 148 if (error != 0) 149 return (set_errno(error)); 150 else 151 return (error); 152 } 153 /* 154 * Change ownership of file given file name. 155 */ 156 int 157 chown(char *fname, uid_t uid, gid_t gid) 158 { 159 return (cfchownat(AT_FDCWD, fname, 1, uid, gid, 0)); 160 } 161 162 int 163 lchown(char *fname, uid_t uid, gid_t gid) 164 { 165 return (cfchownat(AT_FDCWD, fname, 1, uid, gid, AT_SYMLINK_NOFOLLOW)); 166 } 167 168 /* 169 * Change ownership of file given file descriptor. 170 */ 171 int 172 fchown(int fd, uid_t uid, uid_t gid) 173 { 174 return (cfchownat(fd, NULL, 0, uid, gid, 0)); 175 } 176 177 int 178 fchownat(int fd, char *name, uid_t uid, gid_t gid, int flags) 179 { 180 return (cfchownat(fd, name, 2, uid, gid, flags)); 181 182 } 183