xref: /illumos-gate/usr/src/uts/common/syscall/chown.c (revision 7c478bd9)
1*7c478bd9Sstevel@tonic-gate /*
2*7c478bd9Sstevel@tonic-gate  * CDDL HEADER START
3*7c478bd9Sstevel@tonic-gate  *
4*7c478bd9Sstevel@tonic-gate  * The contents of this file are subject to the terms of the
5*7c478bd9Sstevel@tonic-gate  * Common Development and Distribution License, Version 1.0 only
6*7c478bd9Sstevel@tonic-gate  * (the "License").  You may not use this file except in compliance
7*7c478bd9Sstevel@tonic-gate  * with the License.
8*7c478bd9Sstevel@tonic-gate  *
9*7c478bd9Sstevel@tonic-gate  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10*7c478bd9Sstevel@tonic-gate  * or http://www.opensolaris.org/os/licensing.
11*7c478bd9Sstevel@tonic-gate  * See the License for the specific language governing permissions
12*7c478bd9Sstevel@tonic-gate  * and limitations under the License.
13*7c478bd9Sstevel@tonic-gate  *
14*7c478bd9Sstevel@tonic-gate  * When distributing Covered Code, include this CDDL HEADER in each
15*7c478bd9Sstevel@tonic-gate  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16*7c478bd9Sstevel@tonic-gate  * If applicable, add the following below this CDDL HEADER, with the
17*7c478bd9Sstevel@tonic-gate  * fields enclosed by brackets "[]" replaced with your own identifying
18*7c478bd9Sstevel@tonic-gate  * information: Portions Copyright [yyyy] [name of copyright owner]
19*7c478bd9Sstevel@tonic-gate  *
20*7c478bd9Sstevel@tonic-gate  * CDDL HEADER END
21*7c478bd9Sstevel@tonic-gate  */
22*7c478bd9Sstevel@tonic-gate /*
23*7c478bd9Sstevel@tonic-gate  * Copyright 2004 Sun Microsystems, Inc.  All rights reserved.
24*7c478bd9Sstevel@tonic-gate  * Use is subject to license terms.
25*7c478bd9Sstevel@tonic-gate  */
26*7c478bd9Sstevel@tonic-gate 
27*7c478bd9Sstevel@tonic-gate /*	Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T	*/
28*7c478bd9Sstevel@tonic-gate /*	  All Rights Reserved  	*/
29*7c478bd9Sstevel@tonic-gate 
30*7c478bd9Sstevel@tonic-gate /*
31*7c478bd9Sstevel@tonic-gate  * Portions of this source code were derived from Berkeley 4.3 BSD
32*7c478bd9Sstevel@tonic-gate  * under license from the Regents of the University of California.
33*7c478bd9Sstevel@tonic-gate  */
34*7c478bd9Sstevel@tonic-gate 
35*7c478bd9Sstevel@tonic-gate #pragma ident	"%Z%%M%	%I%	%E% SMI"
36*7c478bd9Sstevel@tonic-gate 
37*7c478bd9Sstevel@tonic-gate #include <sys/param.h>
38*7c478bd9Sstevel@tonic-gate #include <sys/isa_defs.h>
39*7c478bd9Sstevel@tonic-gate #include <sys/types.h>
40*7c478bd9Sstevel@tonic-gate #include <sys/sysmacros.h>
41*7c478bd9Sstevel@tonic-gate #include <sys/systm.h>
42*7c478bd9Sstevel@tonic-gate #include <sys/errno.h>
43*7c478bd9Sstevel@tonic-gate #include <sys/fcntl.h>
44*7c478bd9Sstevel@tonic-gate #include <sys/pathname.h>
45*7c478bd9Sstevel@tonic-gate #include <sys/var.h>
46*7c478bd9Sstevel@tonic-gate #include <sys/vfs.h>
47*7c478bd9Sstevel@tonic-gate #include <sys/vnode.h>
48*7c478bd9Sstevel@tonic-gate #include <sys/file.h>
49*7c478bd9Sstevel@tonic-gate #include <sys/mode.h>
50*7c478bd9Sstevel@tonic-gate #include <sys/proc.h>
51*7c478bd9Sstevel@tonic-gate #include <sys/uio.h>
52*7c478bd9Sstevel@tonic-gate #include <sys/filio.h>
53*7c478bd9Sstevel@tonic-gate #include <sys/fcntl.h>
54*7c478bd9Sstevel@tonic-gate #include <sys/debug.h>
55*7c478bd9Sstevel@tonic-gate #include <c2/audit.h>
56*7c478bd9Sstevel@tonic-gate 
57*7c478bd9Sstevel@tonic-gate /*
58*7c478bd9Sstevel@tonic-gate  * nmflag has the following values
59*7c478bd9Sstevel@tonic-gate  *
60*7c478bd9Sstevel@tonic-gate  * 1 - Always do lookup.  i.e. chown, lchown.
61*7c478bd9Sstevel@tonic-gate  * 2 - Name is optional i.e. fchownat
62*7c478bd9Sstevel@tonic-gate  * 0 - Don't lookup name, vp is in file_p. i.e. fchown
63*7c478bd9Sstevel@tonic-gate  *
64*7c478bd9Sstevel@tonic-gate  */
65*7c478bd9Sstevel@tonic-gate int
66*7c478bd9Sstevel@tonic-gate cfchownat(int fd, char *name, int nmflag, uid_t uid, gid_t gid, int flags)
67*7c478bd9Sstevel@tonic-gate {
68*7c478bd9Sstevel@tonic-gate 	vnode_t		*startvp, *vp;
69*7c478bd9Sstevel@tonic-gate 	file_t 		*filefp;
70*7c478bd9Sstevel@tonic-gate 	struct vattr 	vattr;
71*7c478bd9Sstevel@tonic-gate 	int 		error = 0;
72*7c478bd9Sstevel@tonic-gate 	char 		startchar;
73*7c478bd9Sstevel@tonic-gate 
74*7c478bd9Sstevel@tonic-gate 	if (uid < -1 || uid > MAXUID || gid < -1 || gid > MAXUID)
75*7c478bd9Sstevel@tonic-gate 		return (set_errno(EINVAL));
76*7c478bd9Sstevel@tonic-gate 	vattr.va_uid = uid;
77*7c478bd9Sstevel@tonic-gate 	vattr.va_gid = gid;
78*7c478bd9Sstevel@tonic-gate 	vattr.va_mask = 0;
79*7c478bd9Sstevel@tonic-gate 	if (vattr.va_uid != -1)
80*7c478bd9Sstevel@tonic-gate 		vattr.va_mask |= AT_UID;
81*7c478bd9Sstevel@tonic-gate 	if (vattr.va_gid != -1)
82*7c478bd9Sstevel@tonic-gate 		vattr.va_mask |= AT_GID;
83*7c478bd9Sstevel@tonic-gate 
84*7c478bd9Sstevel@tonic-gate 
85*7c478bd9Sstevel@tonic-gate 	if (fd == AT_FDCWD && name == NULL)
86*7c478bd9Sstevel@tonic-gate 		return (set_errno(EFAULT));
87*7c478bd9Sstevel@tonic-gate 
88*7c478bd9Sstevel@tonic-gate 	if (nmflag == 1 || (nmflag == 2 && name != NULL)) {
89*7c478bd9Sstevel@tonic-gate 		if (copyin(name, &startchar, sizeof (char)))
90*7c478bd9Sstevel@tonic-gate 			return (set_errno(EFAULT));
91*7c478bd9Sstevel@tonic-gate 	} else
92*7c478bd9Sstevel@tonic-gate 		startchar = '\0';
93*7c478bd9Sstevel@tonic-gate 
94*7c478bd9Sstevel@tonic-gate 
95*7c478bd9Sstevel@tonic-gate 	if (fd == AT_FDCWD)
96*7c478bd9Sstevel@tonic-gate 		startvp = NULL;
97*7c478bd9Sstevel@tonic-gate 	else {
98*7c478bd9Sstevel@tonic-gate 		/*
99*7c478bd9Sstevel@tonic-gate 		 * only get fd if not doing absolute lookup
100*7c478bd9Sstevel@tonic-gate 		 */
101*7c478bd9Sstevel@tonic-gate 		if (startchar != '/' || nmflag == 0) {
102*7c478bd9Sstevel@tonic-gate 			if ((filefp = getf(fd)) == NULL) {
103*7c478bd9Sstevel@tonic-gate 				return (set_errno(EBADF));
104*7c478bd9Sstevel@tonic-gate 			}
105*7c478bd9Sstevel@tonic-gate 			startvp = filefp->f_vnode;
106*7c478bd9Sstevel@tonic-gate 			VN_HOLD(startvp);
107*7c478bd9Sstevel@tonic-gate 			releasef(fd);
108*7c478bd9Sstevel@tonic-gate 		} else {
109*7c478bd9Sstevel@tonic-gate 			startvp = NULL;
110*7c478bd9Sstevel@tonic-gate 		}
111*7c478bd9Sstevel@tonic-gate 	}
112*7c478bd9Sstevel@tonic-gate 
113*7c478bd9Sstevel@tonic-gate #if C2_AUDIT
114*7c478bd9Sstevel@tonic-gate 	if ((nmflag == 2) && audit_active)
115*7c478bd9Sstevel@tonic-gate 		audit_setfsat_path(1);
116*7c478bd9Sstevel@tonic-gate #endif /* C2_AUDIT */
117*7c478bd9Sstevel@tonic-gate 
118*7c478bd9Sstevel@tonic-gate 	/*
119*7c478bd9Sstevel@tonic-gate 	 * Do lookups for chown, lchown and fchownat when name not NULL
120*7c478bd9Sstevel@tonic-gate 	 */
121*7c478bd9Sstevel@tonic-gate 	if ((nmflag == 2 && name != NULL) || nmflag == 1) {
122*7c478bd9Sstevel@tonic-gate 		if (error = lookupnameat(name, UIO_USERSPACE,
123*7c478bd9Sstevel@tonic-gate 		    (flags == AT_SYMLINK_NOFOLLOW) ?
124*7c478bd9Sstevel@tonic-gate 		    NO_FOLLOW : FOLLOW,
125*7c478bd9Sstevel@tonic-gate 		    NULLVPP, &vp, startvp)) {
126*7c478bd9Sstevel@tonic-gate 			if (startvp != NULL)
127*7c478bd9Sstevel@tonic-gate 				VN_RELE(startvp);
128*7c478bd9Sstevel@tonic-gate 			return (set_errno(error));
129*7c478bd9Sstevel@tonic-gate 		}
130*7c478bd9Sstevel@tonic-gate 	} else {
131*7c478bd9Sstevel@tonic-gate 		vp = startvp;
132*7c478bd9Sstevel@tonic-gate 		ASSERT(vp);
133*7c478bd9Sstevel@tonic-gate 		VN_HOLD(vp);
134*7c478bd9Sstevel@tonic-gate 	}
135*7c478bd9Sstevel@tonic-gate 
136*7c478bd9Sstevel@tonic-gate 	if (vn_is_readonly(vp)) {
137*7c478bd9Sstevel@tonic-gate 		error = EROFS;
138*7c478bd9Sstevel@tonic-gate 	} else {
139*7c478bd9Sstevel@tonic-gate 		error = VOP_SETATTR(vp, &vattr, 0, CRED(), NULL);
140*7c478bd9Sstevel@tonic-gate 	}
141*7c478bd9Sstevel@tonic-gate 
142*7c478bd9Sstevel@tonic-gate 	if (startvp != NULL)
143*7c478bd9Sstevel@tonic-gate 		VN_RELE(startvp);
144*7c478bd9Sstevel@tonic-gate 	if (vp != NULL)
145*7c478bd9Sstevel@tonic-gate 		VN_RELE(vp);
146*7c478bd9Sstevel@tonic-gate 
147*7c478bd9Sstevel@tonic-gate 	if (error != 0)
148*7c478bd9Sstevel@tonic-gate 		return (set_errno(error));
149*7c478bd9Sstevel@tonic-gate 	else
150*7c478bd9Sstevel@tonic-gate 		return (error);
151*7c478bd9Sstevel@tonic-gate }
152*7c478bd9Sstevel@tonic-gate /*
153*7c478bd9Sstevel@tonic-gate  * Change ownership of file given file name.
154*7c478bd9Sstevel@tonic-gate  */
155*7c478bd9Sstevel@tonic-gate int
156*7c478bd9Sstevel@tonic-gate chown(char *fname, uid_t uid, gid_t gid)
157*7c478bd9Sstevel@tonic-gate {
158*7c478bd9Sstevel@tonic-gate 	return (cfchownat(AT_FDCWD, fname, 1, uid, gid, 0));
159*7c478bd9Sstevel@tonic-gate }
160*7c478bd9Sstevel@tonic-gate 
161*7c478bd9Sstevel@tonic-gate int
162*7c478bd9Sstevel@tonic-gate lchown(char *fname, uid_t uid, gid_t gid)
163*7c478bd9Sstevel@tonic-gate {
164*7c478bd9Sstevel@tonic-gate 	return (cfchownat(AT_FDCWD, fname, 1, uid, gid, AT_SYMLINK_NOFOLLOW));
165*7c478bd9Sstevel@tonic-gate }
166*7c478bd9Sstevel@tonic-gate 
167*7c478bd9Sstevel@tonic-gate /*
168*7c478bd9Sstevel@tonic-gate  * Change ownership of file given file descriptor.
169*7c478bd9Sstevel@tonic-gate  */
170*7c478bd9Sstevel@tonic-gate int
171*7c478bd9Sstevel@tonic-gate fchown(int fd, uid_t uid, uid_t gid)
172*7c478bd9Sstevel@tonic-gate {
173*7c478bd9Sstevel@tonic-gate 	return (cfchownat(fd, NULL, 0, uid, gid, 0));
174*7c478bd9Sstevel@tonic-gate }
175*7c478bd9Sstevel@tonic-gate 
176*7c478bd9Sstevel@tonic-gate int
177*7c478bd9Sstevel@tonic-gate fchownat(int fd, char *name, uid_t uid, gid_t gid, int flags)
178*7c478bd9Sstevel@tonic-gate {
179*7c478bd9Sstevel@tonic-gate 	return (cfchownat(fd, name, 2, uid, gid, flags));
180*7c478bd9Sstevel@tonic-gate 
181*7c478bd9Sstevel@tonic-gate }
182