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Add full SELinux support

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Four new dataset properties have been added to support SELinux.  They
are 'context', 'fscontext', 'defcontext' and 'rootcontext' which map
directly to the context options described in mount(8).  When one of
these properties is set to something other than 'none'.  That string
will be passed verbatim as a mount option for the given context when
the filesystem is mounted.

For example, if you wanted the rootcontext for a filesystem to be set
to 'system_u:object_r:fs_t' you would set the property as follows:

  $ zfs set rootcontext="system_u:object_r:fs_t" storage-pool/media

This will ensure the filesystem is automatically mounted with that
rootcontext.  It is equivalent to manually specifying the rootcontext
with the -o option like this:

  $ zfs mount -o rootcontext=system_u:object_r:fs_t storage-pool/media

By default all four contexts are set to 'none'.  Further information
on SELinux contexts is detailed in mount(8) and selinux(8) man pages.

Signed-off-by: Matthew Thode <prometheanfire@gentoo.org>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Richard Yao <ryao@gentoo.org>
Closes #1504
This commit is contained in:
Matthew Thode 2013-12-19 00:24:14 -06:00 committed by Brian Behlendorf
parent d1d7e2689d
commit 11b9ec23b9
10 changed files with 134 additions and 82 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
cmd/mount_zfs/Makefile.am
View File

@ -20,5 +20,3 @@ mount_zfs_LDADD = \
$(top_builddir)/lib/libzpool/libzpool.la \
$(top_builddir)/lib/libzfs/libzfs.la \
$(top_builddir)/lib/libzfs_core/libzfs_core.la
mount_zfs_LDADD += $(LIBSELINUX)

88
cmd/mount_zfs/mount_zfs.c
View File

@ -31,9 +31,6 @@
#include <sys/stat.h>
#include <libzfs.h>
#include <locale.h>
#ifdef HAVE_LIBSELINUX
#include <selinux/selinux.h>
#endif /* HAVE_LIBSELINUX */
libzfs_handle_t *g_zfs;
@ -77,11 +74,10 @@ static const option_map_t option_map[] = {
#ifdef MS_STRICTATIME
{ MNTOPT_DFRATIME, MS_STRICTATIME, ZS_COMMENT },
#endif
{ MNTOPT_CONTEXT, MS_COMMENT, ZS_NOCONTEXT },
{ MNTOPT_NOCONTEXT, MS_COMMENT, ZS_NOCONTEXT },
{ MNTOPT_FSCONTEXT, MS_COMMENT, ZS_NOCONTEXT },
{ MNTOPT_DEFCONTEXT, MS_COMMENT, ZS_NOCONTEXT },
{ MNTOPT_ROOTCONTEXT, MS_COMMENT, ZS_NOCONTEXT },
{ MNTOPT_CONTEXT, MS_COMMENT, ZS_COMMENT },
{ MNTOPT_FSCONTEXT, MS_COMMENT, ZS_COMMENT },
{ MNTOPT_DEFCONTEXT, MS_COMMENT, ZS_COMMENT },
{ MNTOPT_ROOTCONTEXT, MS_COMMENT, ZS_COMMENT },
#ifdef MS_I_VERSION
{ MNTOPT_IVERSION, MS_I_VERSION, ZS_COMMENT },
#endif
@ -338,11 +334,35 @@ mtab_update(char *dataset, char *mntpoint, char *type, char *mntopts)
return (MOUNT_SUCCESS);
}
static void
__zfs_selinux_setcontext(const char *name, const char *context, char *mntopts,
char *mtabopt)
{
char tmp[MNT_LINE_MAX];
snprintf(tmp, MNT_LINE_MAX, ",%s=\"%s\"", name, context);
strlcat(mntopts, tmp, MNT_LINE_MAX);
strlcat(mtabopt, tmp, MNT_LINE_MAX);
}
static void
zfs_selinux_setcontext(zfs_handle_t *zhp, zfs_prop_t zpt, const char *name,
char *mntopts, char *mtabopt)
{
char context[ZFS_MAXPROPLEN];
if (zfs_prop_get(zhp, zpt, context, sizeof (context),
NULL, NULL, 0, B_FALSE) == 0) {
if (strcmp(context, "none") != 0)
__zfs_selinux_setcontext(name, context, mntopts, mtabopt);
}
}
int
main(int argc, char **argv)
{
zfs_handle_t *zhp;
char legacy[ZFS_MAXPROPLEN];
char prop[ZFS_MAXPROPLEN];
char mntopts[MNT_LINE_MAX] = { '\0' };
char badopt[MNT_LINE_MAX] = { '\0' };
char mtabopt[MNT_LINE_MAX] = { '\0' };
@ -437,22 +457,6 @@ main(int argc, char **argv)
}
}
#ifdef HAVE_LIBSELINUX
/*
* Automatically add the default zfs context when selinux is enabled
* and the caller has not specified their own context. This must be
* done until zfs is added to the default selinux policy configuration
* as a known filesystem type which supports xattrs.
*/
if (is_selinux_enabled() && !(zfsflags & ZS_NOCONTEXT)) {
(void) strlcat(mntopts, ",context=\"system_u:"
"object_r:file_t:s0\"", sizeof (mntopts));
(void) strlcat(mtabopt, ",context=\"system_u:"
"object_r:file_t:s0\"", sizeof (mtabopt));
}
#endif /* HAVE_LIBSELINUX */
if (verbose)
(void) fprintf(stdout, gettext("mount.zfs:\n"
" dataset: \"%s\"\n mountpoint: \"%s\"\n"
@ -480,12 +484,36 @@ main(int argc, char **argv)
return (MOUNT_USAGE);
}
/*
* Checks to see if the ZFS_PROP_SELINUX_CONTEXT exists
* if it does, create a tmp variable in case it's needed
* checks to see if the selinux context is set to the default
* if it is, allow the setting of the other context properties
* this is needed because the 'context' property overrides others
* if it is not the default, set the 'context' property
*/
if (zfs_prop_get(zhp, ZFS_PROP_SELINUX_CONTEXT, prop, sizeof (prop),
NULL, NULL, 0, B_FALSE) == 0) {
if (strcmp(prop, "none") == 0) {
zfs_selinux_setcontext(zhp, ZFS_PROP_SELINUX_FSCONTEXT,
MNTOPT_FSCONTEXT, mntopts, mtabopt);
zfs_selinux_setcontext(zhp, ZFS_PROP_SELINUX_DEFCONTEXT,
MNTOPT_DEFCONTEXT, mntopts, mtabopt);
zfs_selinux_setcontext(zhp,
ZFS_PROP_SELINUX_ROOTCONTEXT, MNTOPT_ROOTCONTEXT,
mntopts, mtabopt);
} else {
__zfs_selinux_setcontext(MNTOPT_CONTEXT,
prop, mntopts, mtabopt);
}
}
/* treat all snapshots as legacy mount points */
if (zfs_get_type(zhp) == ZFS_TYPE_SNAPSHOT)
(void) strlcpy(legacy, ZFS_MOUNTPOINT_LEGACY, ZFS_MAXPROPLEN);
(void) strlcpy(prop, ZFS_MOUNTPOINT_LEGACY, ZFS_MAXPROPLEN);
else
(void) zfs_prop_get(zhp, ZFS_PROP_MOUNTPOINT, legacy,
sizeof (legacy), NULL, NULL, 0, B_FALSE);
(void) zfs_prop_get(zhp, ZFS_PROP_MOUNTPOINT, prop,
sizeof (prop), NULL, NULL, 0, B_FALSE);
zfs_close(zhp);
libzfs_fini(g_zfs);
@ -501,7 +529,7 @@ main(int argc, char **argv)
* using zfs as your root file system both rc.sysinit/umountroot and
* systemd depend on 'mount -o remount <mountpoint>' to work.
*/
if (zfsutil && (strcmp(legacy, ZFS_MOUNTPOINT_LEGACY) == 0)) {
if (zfsutil && (strcmp(prop, ZFS_MOUNTPOINT_LEGACY) == 0)) {
(void) fprintf(stderr, gettext(
"filesystem '%s' cannot be mounted using 'zfs mount'.\n"
"Use 'zfs set mountpoint=%s' or 'mount -t zfs %s %s'.\n"
@ -511,7 +539,7 @@ main(int argc, char **argv)
}
if (!zfsutil && !(remount || fake) &&
strcmp(legacy, ZFS_MOUNTPOINT_LEGACY)) {
strcmp(prop, ZFS_MOUNTPOINT_LEGACY)) {
(void) fprintf(stderr, gettext(
"filesystem '%s' cannot be mounted using 'mount'.\n"
"Use 'zfs set mountpoint=%s' or 'zfs mount %s'.\n"

36
config/user-selinux.m4
View File

@ -1,36 +0,0 @@
dnl #
dnl # Check to see if the selinux libraries are available. If they
dnl # are then they will be consulted during mount to determine if
dnl # selinux is enabled or disabled.
dnl #
AC_DEFUN([ZFS_AC_CONFIG_USER_LIBSELINUX], [
AC_ARG_WITH([selinux],
[AS_HELP_STRING([--with-selinux],
[support selinux @<:@default=check@:>@])],
[],
[with_selinux=check])
LIBSELINUX=
AS_IF([test "x$with_selinux" != xno], [
AC_CHECK_HEADER([selinux/selinux.h], [
AC_CHECK_LIB([selinux], [is_selinux_enabled], [
AC_SUBST([LIBSELINUX], ["-lselinux"])
AC_DEFINE([HAVE_LIBSELINUX], 1,
[Define if you have selinux])
], [
AS_IF([test "x$with_selinux" != xcheck],
[AC_MSG_FAILURE(
[--with-selinux given but unavailable])
])
])
], [
AS_IF([test "x$with_selinux" != xcheck],
[AC_MSG_FAILURE(
[--with-selinux given but unavailable])
])
])
], [
AC_MSG_CHECKING([for selinux support])
AC_MSG_RESULT([no])
])
])

1
config/user.m4
View File

@ -9,6 +9,5 @@ AC_DEFUN([ZFS_AC_CONFIG_USER], [
ZFS_AC_CONFIG_USER_ZLIB
ZFS_AC_CONFIG_USER_LIBUUID
ZFS_AC_CONFIG_USER_LIBBLKID
ZFS_AC_CONFIG_USER_LIBSELINUX
ZFS_AC_CONFIG_USER_FRAME_LARGER_THAN
])

4
include/sys/fs/zfs.h
View File

@ -143,6 +143,10 @@ typedef enum {
ZFS_PROP_INCONSISTENT, /* not exposed to the user */
ZFS_PROP_SNAPDEV,
ZFS_PROP_ACLTYPE,
ZFS_PROP_SELINUX_CONTEXT,
ZFS_PROP_SELINUX_FSCONTEXT,
ZFS_PROP_SELINUX_DEFCONTEXT,
ZFS_PROP_SELINUX_ROOTCONTEXT,
ZFS_NUM_PROPS
} zfs_prop_t;

2
lib/libspl/include/sys/mntent.h
View File

@ -47,7 +47,6 @@
#define MNTOPT_AUTO "auto" /* automount */
#define MNTOPT_NOAUTO "noauto" /* do not automount */
#define MNTOPT_CONTEXT "context" /* selinux context */
#define MNTOPT_NOCONTEXT "nocontext" /* No selinux context (zfs-only) */
#define MNTOPT_FSCONTEXT "fscontext" /* selinux fscontext */
#define MNTOPT_DEFCONTEXT "defcontext" /* selinux defcontext */
#define MNTOPT_ROOTCONTEXT "rootcontext" /* selinux rootcontext */
@ -99,6 +98,5 @@
#define ZS_COMMENT 0x00000000 /* comment */
#define ZS_ZFSUTIL 0x00000001 /* caller is zfs(8) */
#define ZS_NOCONTEXT 0x00000002 /* do not add selinux context */
#endif /* _SYS_MNTENT_H */

13
man/man8/mount.zfs.8
View File

@ -75,6 +75,19 @@ Increase verbosity.
.BI "\-h"
Print the usage message.
.TP
.BI "\-o context"
This flag sets the SELinux context for all files in the filesytem
under that mountpoint.
.TP
.BI "\-o fscontext"
This flag sets the SELinux context for the filesytem being mounted.
.TP
.BI "\-o defcontext"
This flag sets the SELinux context for unlabled files.
.TP
.BI "\-o rootcontext"
This flag sets the SELinux context for the root inode of the filesystem.
.TP
.BI "\-o legacy"
This private flag indicates that the
.I dataset

46
man/man8/zfs.8
View File

@ -1298,6 +1298,52 @@ Indicates whether the file system should reject file names that include characte
.sp
.LP
The \fBcasesensitivity\fR, \fBnormalization\fR, and \fButf8only\fR properties are also new permissions that can be assigned to non-privileged users by using the \fBZFS\fR delegated administration feature.
.RE
.sp
.ne 2
.mk
.na
\fB\fBcontext\fR=\fBSELinux_User:SElinux_Role:Selinux_Type:Sensitivity_Level\fR\fR
.ad
.sp .6
.RS 4n
This flag sets the SELinux context for all files in the filesytem under the mountpoint for that filesystem. See \fBselinux\fR(8) for more information.
.RE
.sp
.ne 2
.mk
.na
\fB\fBfscontext\fR=\fBSELinux_User:SElinux_Role:Selinux_Type:Sensitivity_Level\fR\fR
.ad
.sp .6
.RS 4n
This flag sets the SELinux context for the filesytem being mounted. See \fBselinux\fR(8) for more information.
.RE
.sp
.ne 2
.mk
.na
\fB\fBdefntext\fR=\fBSELinux_User:SElinux_Role:Selinux_Type:Sensitivity_Level\fR\fR
.ad
.sp .6
.RS 4n
This flag sets the SELinux context for unlabeled files. See \fBselinux\fR(8) for more information.
.RE
.sp
.ne 2
.mk
.na
\fB\fBrootcontext\fR=\fBSELinux_User:SElinux_Role:Selinux_Type:Sensitivity_Level\fR\fR
.ad
.sp .6
.RS 4n
This flag sets the SELinux context for the root inode of the filesystem. See \fBselinux\fR(8) for more information.
.RE
.SS "Temporary Mount Point Properties"
.LP
When a file system is mounted, either through \fBmount\fR(8) for legacy mounts or the \fBzfs mount\fR command for normal file systems, its mount options are set according to its properties. The correlation between properties and mount options is as follows:

12
module/zcommon/zfs_prop.c
View File

@ -332,6 +332,18 @@ zfs_prop_init(void)
zprop_register_string(ZFS_PROP_MLSLABEL, "mlslabel",
ZFS_MLSLABEL_DEFAULT, PROP_INHERIT, ZFS_TYPE_DATASET,
"<sensitivity label>", "MLSLABEL");
zprop_register_string(ZFS_PROP_SELINUX_CONTEXT, "context",
"none", PROP_DEFAULT, ZFS_TYPE_DATASET, "<selinux context>",
"CONTEXT");
zprop_register_string(ZFS_PROP_SELINUX_FSCONTEXT, "fscontext",
"none", PROP_DEFAULT, ZFS_TYPE_DATASET, "<selinux fscontext>",
"FSCONTEXT");
zprop_register_string(ZFS_PROP_SELINUX_DEFCONTEXT, "defcontext",
"none", PROP_DEFAULT, ZFS_TYPE_DATASET, "<selinux defcontext>",
"DEFCONTEXT");
zprop_register_string(ZFS_PROP_SELINUX_ROOTCONTEXT, "rootcontext",
"none", PROP_DEFAULT, ZFS_TYPE_DATASET, "<selinux rootcontext>",
"ROOTCONTEXT");
/* readonly number properties */
zprop_register_number(ZFS_PROP_USED, "used", 0, PROP_READONLY,

12
rpm/generic/zfs.spec.in
View File

@ -10,7 +10,6 @@
%bcond_with debug
%bcond_with blkid
%bcond_with selinux
Name: @PACKAGE@
@ -38,9 +37,6 @@ BuildRequires: libuuid-devel
%if %{with blkid}
BuildRequires: libblkid-devel
%endif
%if %{with selinux}
BuildRequires: libselinux-devel
%endif
%endif
%description
@ -89,11 +85,6 @@ image which is ZFS aware.
%else
%define blkid --without-blkid
%endif
%if %{with selinux}
%define selinux --with-selinux
%else
%define selinux --without-selinux
%endif
%setup -q
@ -104,8 +95,7 @@ image which is ZFS aware.
--with-dracutdir=%{_dracutdir} \
--disable-static \
%{debug} \
%{blkid} \
%{selinux}
%{blkid}
make %{?_smp_mflags}
%install