d/freebsd-nq
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Submitted by: Whistle Communications (archie Cobbs)

Browse Source 
These changes add the ability to specify that a UFS file/directory
cannot be unlinked. This is basically a scaled back version
of the IMMUTABLE flag. The reason is to allow an administrator
to create a directory hierarchy that a group of users
can arbitrarily add/delete files from, but that the hierarchy
itself is safe from removal by them.
If the NOUNLINK definition is set to 0
then this results in no change to what happens normally.
(and results in identical binary (in the kernel)).
It can be proven that if this bit is never set by the admin,
no new behaviour is introduced..
Several "good idea" comments from reviewers plus one grumble
about creeping featurism.

This code is in production in 2.2 based systems
This commit is contained in:
Julian Elischer 1997-06-02 06:24:52 +00:00
parent e4676ba603
commit 50dab48a5b
10 changed files with 78 additions and 17 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
bin/chflags/chflags.1
View File

@ -83,9 +83,12 @@ arch set the archived flag (super-user only)
dump set the dump flag
sappnd set the system append-only flag (super-user only)
schg set the system immutable flag (super-user only)
sunlnk set the system undeletable flag (super-user only)
uappnd set the user append-only flag (owner or super-user only)
uchg set the user immutable flag (owner or super-user only)
archived, sappend, schange, simmutable, uappend, uchange, uimmutable
uunlnk set the user undeletable flag (owner or super-user only)
archived, sappend, schange, simmutable, uappend, uchange, uimmutable,
sunlink, uunlink
aliases for the above
.Ed
.Pp

10
bin/ls/stat_flags.c
View File

@ -30,7 +30,7 @@
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $Id$
* $Id: stat_flags.c,v 1.5 1997/02/22 14:04:02 peter Exp $
*/
#ifndef lint
@ -69,6 +69,8 @@ flags_to_string(flags, def)
SAPPEND("uappnd");
if (flags & UF_IMMUTABLE)
SAPPEND("uchg");
if (flags & UF_NOUNLINK)
SAPPEND("uunlnk");
if (flags & UF_NODUMP)
SAPPEND("nodump");
if (flags & UF_OPAQUE)
@ -79,6 +81,8 @@ flags_to_string(flags, def)
SAPPEND("arch");
if (flags & SF_IMMUTABLE)
SAPPEND("schg");
if (flags & SF_NOUNLINK)
SAPPEND("sunlnk");
return (prefix == NULL && def != NULL ? def : string);
}
@ -139,6 +143,8 @@ string_to_flags(stringp, setp, clrp)
TEST(p, "schg", SF_IMMUTABLE);
TEST(p, "schange", SF_IMMUTABLE);
TEST(p, "simmutable", SF_IMMUTABLE);
TEST(p, "sunlnk", SF_NOUNLINK);
TEST(p, "sunlink", SF_NOUNLINK);
return (1);
case 'u':
TEST(p, "uappnd", UF_APPEND);
@ -146,6 +152,8 @@ string_to_flags(stringp, setp, clrp)
TEST(p, "uchg", UF_IMMUTABLE);
TEST(p, "uchange", UF_IMMUTABLE);
TEST(p, "uimmutable", UF_IMMUTABLE);
TEST(p, "uunlnk", UF_NOUNLINK);
TEST(p, "uunlink", UF_NOUNLINK);
/* FALLTHROUGH */
default:
return (1);

10
lib/libc/gen/setflags.c
View File

@ -30,7 +30,7 @@
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $Id$
* $Id: stat_flags.c,v 1.5 1997/02/22 14:04:02 peter Exp $
*/
#ifndef lint
@ -69,6 +69,8 @@ flags_to_string(flags, def)
SAPPEND("uappnd");
if (flags & UF_IMMUTABLE)
SAPPEND("uchg");
if (flags & UF_NOUNLINK)
SAPPEND("uunlnk");
if (flags & UF_NODUMP)
SAPPEND("nodump");
if (flags & UF_OPAQUE)
@ -79,6 +81,8 @@ flags_to_string(flags, def)
SAPPEND("arch");
if (flags & SF_IMMUTABLE)
SAPPEND("schg");
if (flags & SF_NOUNLINK)
SAPPEND("sunlnk");
return (prefix == NULL && def != NULL ? def : string);
}
@ -139,6 +143,8 @@ string_to_flags(stringp, setp, clrp)
TEST(p, "schg", SF_IMMUTABLE);
TEST(p, "schange", SF_IMMUTABLE);
TEST(p, "simmutable", SF_IMMUTABLE);
TEST(p, "sunlnk", SF_NOUNLINK);
TEST(p, "sunlink", SF_NOUNLINK);
return (1);
case 'u':
TEST(p, "uappnd", UF_APPEND);
@ -146,6 +152,8 @@ string_to_flags(stringp, setp, clrp)
TEST(p, "uchg", UF_IMMUTABLE);
TEST(p, "uchange", UF_IMMUTABLE);
TEST(p, "uimmutable", UF_IMMUTABLE);
TEST(p, "uunlnk", UF_NOUNLINK);
TEST(p, "uunlink", UF_NOUNLINK);
/* FALLTHROUGH */
default:
return (1);

10
lib/libc/gen/setflagsbyname.c
View File

@ -30,7 +30,7 @@
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $Id$
* $Id: stat_flags.c,v 1.5 1997/02/22 14:04:02 peter Exp $
*/
#ifndef lint
@ -69,6 +69,8 @@ flags_to_string(flags, def)
SAPPEND("uappnd");
if (flags & UF_IMMUTABLE)
SAPPEND("uchg");
if (flags & UF_NOUNLINK)
SAPPEND("uunlnk");
if (flags & UF_NODUMP)
SAPPEND("nodump");
if (flags & UF_OPAQUE)
@ -79,6 +81,8 @@ flags_to_string(flags, def)
SAPPEND("arch");
if (flags & SF_IMMUTABLE)
SAPPEND("schg");
if (flags & SF_NOUNLINK)
SAPPEND("sunlnk");
return (prefix == NULL && def != NULL ? def : string);
}
@ -139,6 +143,8 @@ string_to_flags(stringp, setp, clrp)
TEST(p, "schg", SF_IMMUTABLE);
TEST(p, "schange", SF_IMMUTABLE);
TEST(p, "simmutable", SF_IMMUTABLE);
TEST(p, "sunlnk", SF_NOUNLINK);
TEST(p, "sunlink", SF_NOUNLINK);
return (1);
case 'u':
TEST(p, "uappnd", UF_APPEND);
@ -146,6 +152,8 @@ string_to_flags(stringp, setp, clrp)
TEST(p, "uchg", UF_IMMUTABLE);
TEST(p, "uchange", UF_IMMUTABLE);
TEST(p, "uimmutable", UF_IMMUTABLE);
TEST(p, "uunlnk", UF_NOUNLINK);
TEST(p, "uunlink", UF_NOUNLINK);
/* FALLTHROUGH */
default:
return (1);

10
lib/libc/gen/strtofflags.c
View File

@ -30,7 +30,7 @@
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $Id$
* $Id: stat_flags.c,v 1.5 1997/02/22 14:04:02 peter Exp $
*/
#ifndef lint
@ -69,6 +69,8 @@ flags_to_string(flags, def)
SAPPEND("uappnd");
if (flags & UF_IMMUTABLE)
SAPPEND("uchg");
if (flags & UF_NOUNLINK)
SAPPEND("uunlnk");
if (flags & UF_NODUMP)
SAPPEND("nodump");
if (flags & UF_OPAQUE)
@ -79,6 +81,8 @@ flags_to_string(flags, def)
SAPPEND("arch");
if (flags & SF_IMMUTABLE)
SAPPEND("schg");
if (flags & SF_NOUNLINK)
SAPPEND("sunlnk");
return (prefix == NULL && def != NULL ? def : string);
}
@ -139,6 +143,8 @@ string_to_flags(stringp, setp, clrp)
TEST(p, "schg", SF_IMMUTABLE);
TEST(p, "schange", SF_IMMUTABLE);
TEST(p, "simmutable", SF_IMMUTABLE);
TEST(p, "sunlnk", SF_NOUNLINK);
TEST(p, "sunlink", SF_NOUNLINK);
return (1);
case 'u':
TEST(p, "uappnd", UF_APPEND);
@ -146,6 +152,8 @@ string_to_flags(stringp, setp, clrp)
TEST(p, "uchg", UF_IMMUTABLE);
TEST(p, "uchange", UF_IMMUTABLE);
TEST(p, "uimmutable", UF_IMMUTABLE);
TEST(p, "uunlnk", UF_NOUNLINK);
TEST(p, "uunlink", UF_NOUNLINK);
/* FALLTHROUGH */
default:
return (1);

12
lib/libc/sys/chflags.2
View File

@ -65,6 +65,8 @@ Do not dump the file.
The file may not be changed.
.It UF_APPEND
The file may only be appended to.
.It UF_NOUNLINK
The file may not be renamed or deleted.
.It UF_OPAQUE
The directory is opaque when viewed through a union stack.
.\".It ARCHIVED
@ -73,18 +75,24 @@ The directory is opaque when viewed through a union stack.
The file may not be changed.
.It SF_APPEND
The file may only be appended to.
.It SF_NOUNLINK
The file may not be renamed or deleted.
.El
.Pp
The
.Dq UF_IMMUTABLE
and
,
.Dq UF_APPEND
and
.Dq UF_NOUNLINK
flags may be set or unset by either the owner of a file or the super-user.
.Pp
The
.Dq SF_IMMUTABLE
and
,
.Dq SF_APPEND
and
.Dq SF_NOUNLINK
flags may only be set or unset by the super-user.
Attempts by the non-super-user to set the super-user only flags
are silently ignored.

10
lib/libutil/stat_flags.c
View File

@ -30,7 +30,7 @@
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $Id$
* $Id: stat_flags.c,v 1.5 1997/02/22 14:04:02 peter Exp $
*/
#ifndef lint
@ -69,6 +69,8 @@ flags_to_string(flags, def)
SAPPEND("uappnd");
if (flags & UF_IMMUTABLE)
SAPPEND("uchg");
if (flags & UF_NOUNLINK)
SAPPEND("uunlnk");
if (flags & UF_NODUMP)
SAPPEND("nodump");
if (flags & UF_OPAQUE)
@ -79,6 +81,8 @@ flags_to_string(flags, def)
SAPPEND("arch");
if (flags & SF_IMMUTABLE)
SAPPEND("schg");
if (flags & SF_NOUNLINK)
SAPPEND("sunlnk");
return (prefix == NULL && def != NULL ? def : string);
}
@ -139,6 +143,8 @@ string_to_flags(stringp, setp, clrp)
TEST(p, "schg", SF_IMMUTABLE);
TEST(p, "schange", SF_IMMUTABLE);
TEST(p, "simmutable", SF_IMMUTABLE);
TEST(p, "sunlnk", SF_NOUNLINK);
TEST(p, "sunlink", SF_NOUNLINK);
return (1);
case 'u':
TEST(p, "uappnd", UF_APPEND);
@ -146,6 +152,8 @@ string_to_flags(stringp, setp, clrp)
TEST(p, "uchg", UF_IMMUTABLE);
TEST(p, "uchange", UF_IMMUTABLE);
TEST(p, "uimmutable", UF_IMMUTABLE);
TEST(p, "uunlnk", UF_NOUNLINK);
TEST(p, "uunlink", UF_NOUNLINK);
/* FALLTHROUGH */
default:
return (1);

5
sys/sys/stat.h
View File

@ -36,7 +36,7 @@
* SUCH DAMAGE.
*
* @(#)stat.h 8.12 (Berkeley) 6/16/95
* $Id: stat.h,v 1.11 1997/02/22 09:45:58 peter Exp $
* $Id: stat.h,v 1.12 1997/04/09 16:32:23 bde Exp $
*/
#ifndef _SYS_STAT_H_
@ -175,6 +175,7 @@ struct stat {
#define UF_IMMUTABLE 0x00000002 /* file may not be changed */
#define UF_APPEND 0x00000004 /* writes to file may only append */
#define UF_OPAQUE 0x00000008 /* directory is opaque wrt. union */
#define UF_NOUNLINK 0x00000010 /* file may not be removed or renamed */
/*
* Super-user changeable flags.
*/
@ -182,6 +183,7 @@ struct stat {
#define SF_ARCHIVED 0x00010000 /* file is archived */
#define SF_IMMUTABLE 0x00020000 /* file may not be changed */
#define SF_APPEND 0x00040000 /* writes to file may only append */
#define SF_NOUNLINK 0x00100000 /* file may not be removed or renamed */
#ifdef KERNEL
/*
@ -190,6 +192,7 @@ struct stat {
#define OPAQUE (UF_OPAQUE)
#define APPEND (UF_APPEND | SF_APPEND)
#define IMMUTABLE (UF_IMMUTABLE | SF_IMMUTABLE)
#define NOUNLINK (UF_NOUNLINK | SF_NOUNLINK)
#endif
#endif /* !_POSIX_SOURCE */

18
sys/ufs/ufs/ufs_vnops.c
View File

@ -36,7 +36,7 @@
* SUCH DAMAGE.
*
* @(#)ufs_vnops.c 8.27 (Berkeley) 5/27/95
* $Id: ufs_vnops.c,v 1.49 1997/03/31 12:02:53 peter Exp $
* $Id: ufs_vnops.c,v 1.50 1997/05/17 18:32:53 phk Exp $
*/
#include "opt_quota.h"
@ -376,12 +376,14 @@ ufs_setattr(ap)
(error = suser(cred, &p->p_acflag)))
return (error);
if (cred->cr_uid == 0) {
if ((ip->i_flags & (SF_IMMUTABLE | SF_APPEND)) &&
if ((ip->i_flags
& (SF_NOUNLINK | SF_IMMUTABLE | SF_APPEND)) &&
securelevel > 0)
return (EPERM);
ip->i_flags = vap->va_flags;
} else {
if (ip->i_flags & (SF_IMMUTABLE | SF_APPEND) ||
if (ip->i_flags
& (SF_NOUNLINK | SF_IMMUTABLE | SF_APPEND) ||
(vap->va_flags & UF_SETTABLE) != vap->va_flags)
return (EPERM);
ip->i_flags &= SF_SETTABLE;
@ -674,7 +676,7 @@ ufs_remove(ap)
int error;
ip = VTOI(vp);
if ((ip->i_flags & (IMMUTABLE | APPEND)) ||
if ((ip->i_flags & (NOUNLINK | IMMUTABLE | APPEND)) ||
(VTOI(dvp)->i_flags & APPEND)) {
error = EPERM;
goto out;
@ -904,7 +906,7 @@ ufs_rename(ap)
return (error);
}
if (tvp && ((VTOI(tvp)->i_flags & (IMMUTABLE | APPEND)) ||
if (tvp && ((VTOI(tvp)->i_flags & (NOUNLINK | IMMUTABLE | APPEND)) ||
(VTOI(tdvp)->i_flags & APPEND))) {
error = EPERM;
goto abortit;
@ -965,7 +967,8 @@ ufs_rename(ap)
goto abortit;
dp = VTOI(fdvp);
ip = VTOI(fvp);
if ((ip->i_flags & (IMMUTABLE | APPEND)) || (dp->i_flags & APPEND)) {
if ((ip->i_flags & (NOUNLINK | IMMUTABLE | APPEND))
|| (dp->i_flags & APPEND)) {
VOP_UNLOCK(fvp, 0, p);
error = EPERM;
goto abortit;
@ -1504,7 +1507,8 @@ ufs_rmdir(ap)
error = ENOTEMPTY;
goto out;
}
if ((dp->i_flags & APPEND) || (ip->i_flags & (IMMUTABLE | APPEND))) {
if ((dp->i_flags & APPEND)
|| (ip->i_flags & (NOUNLINK | IMMUTABLE | APPEND))) {
error = EPERM;
goto out;
}

5
usr.bin/chflags/chflags.1
View File

@ -83,9 +83,12 @@ arch set the archived flag (super-user only)
dump set the dump flag
sappnd set the system append-only flag (super-user only)
schg set the system immutable flag (super-user only)
sunlnk set the system undeletable flag (super-user only)
uappnd set the user append-only flag (owner or super-user only)
uchg set the user immutable flag (owner or super-user only)
archived, sappend, schange, simmutable, uappend, uchange, uimmutable
uunlnk set the user undeletable flag (owner or super-user only)
archived, sappend, schange, simmutable, uappend, uchange, uimmutable,
sunlink, uunlink
aliases for the above
.Ed
.Pp