Introduce support for Mandatory Access Control and extensible

kernel access control.

Extensions to libc to provide basic MAC label manipulation facilities
for userland.  These interface will be replaced in the next month
or two with more flexible interfaces, but provide sufficient support
to allow use of the Biba and MLS policies for user applications.

libc_r wrappers to follow.

Obtained from:	TrustedBSD Project
Sponsored by:	DARPA, NAI Labs

18 files changed, 1878 insertions, 2 deletions

diff --git a/lib/libc/posix1e/Makefile.inc b/lib/libc/posix1e/Makefile.inc
index f042e6d..abac906 100644
--- a/lib/libc/posix1e/Makefile.inc
+++ b/lib/libc/posix1e/Makefile.inc
@@ -18,7 +18,16 @@ SRCS+=	acl_calc_mask.c			\
 	acl_support.c			\
 	acl_to_text.c			\
 	acl_valid.c			\
-	extattr.c
+	extattr.c			\
+	mac_biba.c			\
+	mac_free.c			\
+	mac_is_present_np.c		\
+	mac_get.c			\
+	mac_mls.c			\
+	mac_sebsd.c			\
+	mac_set.c			\
+	mac_te.c			\
+	mac_text.c
 
 .if ${LIB} == "c"
 
@@ -48,6 +57,12 @@ MAN+=	acl.3				\
 	acl_to_text.3			\
 	acl_valid.3			\
 	extattr.3			\
+	mac.3				\
+	mac_free.3			\
+	mac_is_present_np.3		\
+	mac_get.3			\
+	mac_set.3			\
+	mac_text.3			\
 	posix1e.3
 
 MLINKS+=acl_delete.3 acl_delete_def_file.3	\
@@ -62,6 +77,14 @@ MLINKS+=acl_delete.3 acl_delete_def_file.3	\
 	acl_valid.3 acl_valid_file_np.3		\
 	acl_valid.3 acl_valid_fd_np.3		\
 	extattr.3 extattr_namespace_to_string.3	\
-	extattr.3 extattr_string_to_namespace.3
+	extattr.3 extattr_string_to_namespace.3 \
+	mac_get.3 mac_get_fd.3			\
+	mac_get.3 mac_get_file.3		\
+	mac_get.3 mac_get_proc.3		\
+	mac_set.3 mac_set_fd.3			\
+	mac_set.3 mac_set_file.3		\
+	mac_set.3 mac_set_proc.3		\
+	mac_text.3 mac_from_text.3		\
+	mac_text.3 mac_to_text.3
 
 .endif
diff --git a/lib/libc/posix1e/mac.3 b/lib/libc/posix1e/mac.3
new file mode 100644
index 0000000..c6a70d0
--- /dev/null
+++ b/lib/libc/posix1e/mac.3
@@ -0,0 +1,140 @@
+.\" Copyright (c) 2001 Networks Associates Technology, Inc.
+.\" All rights reserved.
+.\" 
+.\" This software was developed for the FreeBSD Project by Chris
+.\" Costello at Safeport Network Services and NAI Labs, the Security
+.\" Research Division of Network Associates, Inc. under DARPA/SPAWAR
+.\" contract N66001-01-C-8035 ("CBOSS"), as part of the DARPA CHATS
+.\" research program.
+.\" 
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 3. The name of the author may not be used to endorse or promote
+.\"    products derived from this software without specific prior written
+.\"    permission.
+.\" 
+.\" THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\" 
+.\" $FreeBSD$
+.Dd December 21, 2001
+.Dt MAC 3
+.Sh NAME
+.Nm mac
+.Nd introduction to the POSIX.1e MAC security API
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In sys/mac.h
+.Pp
+In the kernel configuration file:
+.Cd "options MAC"
+.Sh DESCRIPTION
+.Fx
+permits administrators to define Mandatory Access Control labels
+defining levels for the privacy and integrity of data,
+overriding discretionary policies
+for those objects.
+Not all objects currently provide support for MAC labels,
+and MAC support must be explicitly enabled by the administrator.
+The library calls include routines to retrieve, duplicate,
+and set MAC labels associated with files and processes.
+.Pp
+POSIX.1e describes a set of MAC manipulation routines
+to manage the contents of MAC labels,
+as well as their relationships with
+files and processes;
+almost all of these support routines
+are implemented in
+.Fx .
+.Pp
+Available functions, sorted by behavior, include:
+.Bl -tag -width indent
+.It Fn mac_get_fd
+This function is described in
+.Xr mac_get 3 ,
+and may be used to retrieve the
+MAC label associated with
+a specific file descriptor.
+.It Fn mac_get_file
+This function is described in
+.Xr mac_get 3 ,
+and may be used to retrieve the
+MAC label associated with
+a named file.
+.It Fn mac_get_proc
+This function is described in
+.Xr mac_get 3 ,
+and may be used to retrieve the
+MAC label associated with
+the calling process.
+.It Fn mac_set_fd
+This function is described in
+.Xr mac_set 3 ,
+and may be used to set the
+MAC label associated with
+a specific file descriptor.
+.It Fn mac_set_file
+This function is described in
+.Xr mac_set 3 ,
+and may be used to set the
+MAC label associated with
+a named file.
+.It Fn mac_set_proc
+This function is described in
+.Xr mac_set 3 ,
+and may be used to set the
+MAC label associated with
+the calling process.
+.It Fn mac_free
+This function is described in
+.Xr mac_free 3 ,
+and may be used to free
+userland working MAC label storage.
+.It Fn mac_from_text
+This function is described in
+.Xr mac_text 3 ,
+and may be used to convert
+a text-form MAC label
+into a working
+.Vt mac_t .
+.It Fn mac_to_text
+This function is described in
+.Xr mac_text 3 ,
+and may be used to convert a
+.Vt mac_t
+into a text-form MAC label.
+.El
+.Sh IMPLEMENTATION NOTES
+.Fx Ns 's
+support for POSIX.1e interfaces and features
+is still under development
+at this time.
+.Sh SEE ALSO
+.Xr mac_free 3 ,
+.Xr mac_get 3 ,
+.Xr mac_set 3 ,
+.Xr mac_text 3
+.Sh STANDARDS
+POSIX.1e is described in IEEE POSIX.1e draft 17.
+Discussion of the draft
+continues on the cross-platform POSIX.1e implementation mailing list.
+To join this list, see the
+.Fx
+POSIX.1e implementation page
+for more information.
diff --git a/lib/libc/posix1e/mac_biba.c b/lib/libc/posix1e/mac_biba.c
new file mode 100644
index 0000000..7d32480
--- /dev/null
+++ b/lib/libc/posix1e/mac_biba.c
@@ -0,0 +1,218 @@
+/*
+ * Copyright (c) 1999, 2000, 2001, 2002 Robert N. M. Watson
+ * Copyright (c) 2002 Networks Associates Technology, Inc.
+ * All rights reserved.
+ *
+ * This software was developed by Robert Watson for the TrustedBSD Project.
+ *
+ * This software was developed for the FreeBSD Project in part by NAI Labs,
+ * the Security Research Division of Network Associates, Inc. under
+ * DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as part of the DARPA
+ * CHATS research program.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. The names of the authors may not be used to endorse or promote
+ *    products derived from this software without specific prior written
+ *    permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * $FreeBSD$
+ */
+
+#include <sys/types.h>
+#include <sys/mac.h>
+
+#include <security/mac_biba/mac_biba.h>
+
+#include <errno.h>
+#include <stdlib.h>
+#include <string.h>
+
+/*
+ * Biba labels take the following format:
+ * [optional bibasingle][optional bibarange]
+ * bibasingle: {low,0-65535,high,equal}
+ * bibarange: ([bibasingle]-[bibasingle])
+ */
+
+/*
+ * Extract mac_biba_element contents from a string.
+ */
+static int
+mac_biba_element_from_string(char *string, struct mac_biba_element *element)
+{
+	unsigned long value;
+	char *endp;
+	int error;
+
+	if (strcmp(string, "low") == 0) {
+		element->mbe_type = MAC_BIBA_TYPE_LOW;
+		element->mbe_grade = 0;
+		error = 0;
+	} else if (strcmp(string, "high") == 0) {
+		element->mbe_type = MAC_BIBA_TYPE_HIGH;
+		element->mbe_grade = 0;
+		error = 0;
+	} else if (strcmp(string, "equal") == 0) {
+		element->mbe_type = MAC_BIBA_TYPE_EQUAL;
+		element->mbe_grade = 0;
+		error = 0;
+	} else {
+		value = strtoul(string, &endp, 10);
+		if (*endp == '\0' && value == (u_short) value) {
+			element->mbe_type = MAC_BIBA_TYPE_GRADE;
+			element->mbe_grade = value;
+			error = 0;
+		} else
+			error = EINVAL;
+	}
+
+	return (error);
+}
+
+/*
+ * Destructively convert a string into a mac_biba.
+ */
+int
+mac_biba_label_from_string(char *string, struct mac *label)
+{
+	char *string_single, *string_rangelow, *string_rangehigh;
+	int error;
+
+	bzero(&label->m_biba, sizeof(label->m_biba));
+
+	/*
+	 * Is a '(' present?, if so check for last character of ')', and
+	 * split into single and range strings after nulling the '(' and
+	 * ')'.  Reject if appropriate.
+	 */
+
+	string_single = strsep(&string, "(");
+	if (*string_single == '\0' && string == NULL) {
+		/* No interesting elements to parse, flags already zero'd. */
+		return (0);
+	}
+	if (string != NULL) {
+		/* If a '(' was present, last character must be ')'. */
+		if (*string == '\0')
+			return (EINVAL);
+		if (string[strlen(string)-1] != ')')
+			return (EINVAL);
+		string[strlen(string)-1] = '\0';
+	}
+
+	/*
+	 * If range is present, split range into rangelow and rangehigh
+	 * based on '-', if present, and nul it.  Process range elements.
+	 * Reject if appropriate.
+	 */
+	if (string != NULL) {
+		string_rangehigh = string;
+		string_rangelow = strsep(&string_rangehigh, "-");
+		if (*string_rangelow == '\0' || string_rangehigh == NULL)
+			return (EINVAL);
+		error = mac_biba_element_from_string(string_rangelow,
+		    &label->m_biba.mb_rangelow);
+		if (error)
+			return (error);
+		error = mac_biba_element_from_string(string_rangehigh,
+		    &label->m_biba.mb_rangehigh);
+		if (error)
+			return (error);
+		label->m_biba.mb_flags |= MAC_BIBA_FLAG_RANGE;
+	}
+
+	/*
+	 * If single is present, process single and reject if needed.
+	 */
+	if (*string_single != '\0') {
+		error = mac_biba_element_from_string(string_single,
+		    &label->m_biba.mb_single);
+		if (error)
+			return (error);
+		label->m_biba.mb_flags |= MAC_BIBA_FLAG_SINGLE;
+	}
+
+	return (0);
+}
+
+static char *
+mac_biba_string_from_element(struct mac_biba_element *element)
+{
+	char *string;
+
+	switch(element->mbe_type) {
+	case MAC_BIBA_TYPE_LOW:
+		return (strdup("low"));
+
+	case MAC_BIBA_TYPE_HIGH:
+		return (strdup("high"));
+
+	case MAC_BIBA_TYPE_EQUAL:
+		return (strdup("equal"));
+
+	case MAC_BIBA_TYPE_GRADE:
+		asprintf(&string, "%d", element->mbe_grade);
+		return (string);
+
+	default:
+		return (strdup("invalid"));
+	}
+}
+
+char *
+mac_biba_string_from_label(struct mac *label)
+{
+	char *format_string = NULL;
+	char *string = NULL, *string_single = NULL, *string_rangelow = NULL;
+	char *string_rangehigh = NULL;
+
+	if (label->m_biba.mb_flags & MAC_BIBA_FLAG_SINGLE) {
+		string_single = mac_biba_string_from_element(
+		    &label->m_biba.mb_single);
+	}
+	if (label->m_biba.mb_flags & MAC_BIBA_FLAG_RANGE) {
+		string_rangelow = mac_biba_string_from_element(
+		    &label->m_biba.mb_rangelow);
+		string_rangehigh = mac_biba_string_from_element(
+		    &label->m_biba.mb_rangehigh);
+	}
+
+	if (string_rangelow && string_single) {
+		asprintf(&string, "%s(%s-%s)", string_single, string_rangelow,
+		    string_rangehigh);
+	} else if (string_rangelow) {
+		asprintf(&string, "(%s-%s)", string_rangelow,
+		    string_rangehigh);
+	} else if (string_single) {
+		asprintf(&string, "%s", string_single);
+	} else
+		string = strdup("");
+
+	if (string_single)
+		free(string_single);
+	if (string_rangelow)
+		free(string_rangelow);
+	if (string_rangehigh)
+		free(string_rangehigh);
+
+	return (string);
+}
diff --git a/lib/libc/posix1e/mac_free.3 b/lib/libc/posix1e/mac_free.3
new file mode 100644
index 0000000..a29be1a
--- /dev/null
+++ b/lib/libc/posix1e/mac_free.3
@@ -0,0 +1,73 @@
+.\" Copyright (c) 2001 Networks Associates Technology, Inc.
+.\" All rights reserved.
+.\" 
+.\" This software was developed for the FreeBSD Project by Chris
+.\" Costello at Safeport Network Services and NAI Labs, the Security
+.\" Research Division of Network Associates, Inc. under DARPA/SPAWAR
+.\" contract N66001-01-C-8035 ("CBOSS"), as part of the DARPA CHATS
+.\" research program.
+.\" 
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 3. The name of the author may not be used to endorse or promote
+.\"    products derived from this software without specific prior written
+.\"    permission.
+.\" 
+.\" THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\" 
+.\" $FreeBSD$
+.Dd December 21, 2001
+.Dt MAC_FREE 3
+.Os
+.Sh NAME
+.Nm mac_free
+.Nd free MAC label
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In sys/mac.h
+.Ft int
+.Fn mac_free "void *buf_p"
+.Sh DESCRIPTION
+The
+.Fn mac_free
+function frees the storage allocated to contain either a
+.Vt mac_t
+or a
+.Vt char * ,
+as allocated by the
+.Fn mac_to_text
+function.
+.Sh RETURN VALUES
+The
+.Fn mac_free
+function always returns 0.
+.Sh SEE ALSO
+.Xr mac 3 ,
+.Xr mac_get 3 ,
+.Xr mac_set 3 ,
+.Xr mac_text 3
+.Sh STANDARDS
+POSIX.1e is described in IEEE POSIX.1e draft 17.
+Discussion of the draft
+continues on the cross-platform POSIX.1e implementation mailing list.
+To join this list, see the
+.Fx
+POSIX.1e implementation page
+for more information.
diff --git a/lib/libc/posix1e/mac_free.c b/lib/libc/posix1e/mac_free.c
new file mode 100644
index 0000000..696ef42
--- /dev/null
+++ b/lib/libc/posix1e/mac_free.c
@@ -0,0 +1,45 @@
+/*
+ * Copyright (c) 1999, 2000, 2001, 2002 Robert N. M. Watson
+ * All rights reserved.
+ *
+ * This software was developed by Robert Watson for the TrustedBSD Project.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. The names of the authors may not be used to endorse or promote
+ *    products derived from this software without specific prior written
+ *    permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * $FreeBSD$
+ */
+
+#include <sys/types.h>
+#include <sys/mac.h>
+
+#include <stdlib.h>
+
+int
+mac_free(void *buf_p)
+{
+
+	free(buf_p);
+	return (0);
+}
diff --git a/lib/libc/posix1e/mac_get.3 b/lib/libc/posix1e/mac_get.3
new file mode 100644
index 0000000..505aed0
--- /dev/null
+++ b/lib/libc/posix1e/mac_get.3
@@ -0,0 +1,108 @@
+.\" Copyright (c) 2001 Networks Associates Technology, Inc.
+.\" All rights reserved.
+.\" 
+.\" This software was developed for the FreeBSD Project by Chris
+.\" Costello at Safeport Network Services and NAI Labs, the Security
+.\" Research Division of Network Associates, Inc. under DARPA/SPAWAR
+.\" contract N66001-01-C-8035 ("CBOSS"), as part of the DARPA CHATS
+.\" research program.
+.\" 
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 3. The name of the author may not be used to endorse or promote
+.\"    products derived from this software without specific prior written
+.\"    permission.
+.\" 
+.\" THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\" 
+.\" $FreeBSD$
+.Dd December 21, 2001
+.Dt MAC_GET 3
+.Sh NAME
+.Nm mac_get_file ,
+.Nm mac_get_fd ,
+.Nm mac_get_proc
+.Nd get the label of a file, socket, socket peer or process
+.Sh SYNOPSIS
+.In sys/mac.h
+.Ft mac_t
+.Fn mac_get_file "const char *path_p"
+.Ft mac_t
+.Fn mac_get_fd "int fd"
+.Ft mac_t
+.Fn mac_get_proc
+.Sh DESCRIPTION
+The
+.Fn mac_get_file
+and
+.Fn mac_get_fd
+functions return the MAC label associated
+with the file referenced by
+the pathname pointed to by
+.Fa path_p
+or the file descriptor specified by
+.Fa fd ,
+respectively.  Note this function will
+fail on socket descriptors.  For information on
+getting MAC labels on socket descriptors see
+.Xr getsockopt 2 .
+The
+.Fn mac_get_proc
+function returns a MAC label associated
+with the requesting process.
+.Sh ERRORS
+.Bl -tag -width Er
+.It Bq Er EACCES
+A component of
+.Fa path_p
+is not searchable,
+or MAC read access to the file
+is denied.
+.It Bq Er ENAMETOOLONG
+The pathname pointed to by
+.Fa path_p
+exceeds
+.Dv PATH_MAX ,
+or a component of the pathname exceeds
+.Dv NAME_MAX .
+.It Bq Er ENOENT
+A component of
+.Fa path_p
+does not exist.
+.It Bq Er ENOMEM
+Insufficient memory is available
+to allocate a new MAC label structure.
+.It Bq Er ENOTDIR
+A component of
+.Fa path_p
+is not a directory.
+.El
+.Sh SEE ALSO
+.Xr mac 3 ,
+.Xr mac_free 3 ,
+.Xr mac_text 3 ,
+.Xr mac_set 3
+.Sh STANDARDS
+POSIX.1e is described in IEEE POSIX.1e draft 17.
+Discussion of the draft
+continues on the cross-platform POSIX.1e implementation mailing list.
+To join this list, see the
+.Fx
+POSIX.1e implementation page
+for more information.
diff --git a/lib/libc/posix1e/mac_get.c b/lib/libc/posix1e/mac_get.c
new file mode 100644
index 0000000..f983ec1
--- /dev/null
+++ b/lib/libc/posix1e/mac_get.c
@@ -0,0 +1,101 @@
+/*
+ * Copyright (c) 1999, 2000, 2001, 2002 Robert N. M. Watson
+ * All rights reserved.
+ *
+ * This software was developed by Robert Watson for the TrustedBSD Project.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. The names of the authors may not be used to endorse or promote
+ *    products derived from this software without specific prior written
+ *    permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * $FreeBSD$
+ */
+
+#include <sys/types.h>
+#include <sys/mac.h>
+
+#include <errno.h>
+#include <stdlib.h>
+
+mac_t
+mac_get_file(const char *path_p)
+{
+	struct mac *label;
+	int error;
+
+	label = (mac_t) malloc(sizeof(*label));
+	if (label == NULL) {
+		errno = ENOMEM;
+		return (NULL);
+	}
+
+	error = __mac_get_file(path_p, label);
+	if (error) {
+		mac_free(label);
+		return (NULL);
+	}
+
+	return (label);
+}
+
+mac_t
+mac_get_fd(int fd)
+{
+	struct mac *label;
+	int error;
+
+	label = (mac_t) malloc(sizeof(*label));
+	if (label == NULL) {
+		errno = ENOMEM;
+		return (NULL);
+	}
+
+	error = __mac_get_fd(fd, label);
+	if (error) {
+		mac_free(label);
+		return (NULL);
+	}
+
+	return (label);
+}
+
+mac_t
+mac_get_proc()
+{
+	struct mac *label;
+	int error;
+
+	label = (mac_t) malloc(sizeof(*label));
+	if (label == NULL) {
+		errno = ENOMEM;
+		return (NULL);
+	}
+
+	error = __mac_get_proc(label);
+	if (error) {
+		mac_free(label);
+		return (NULL);
+	}
+
+	return (label);
+}
diff --git a/lib/libc/posix1e/mac_internal.h b/lib/libc/posix1e/mac_internal.h
new file mode 100644
index 0000000..20c46b3
--- /dev/null
+++ b/lib/libc/posix1e/mac_internal.h
@@ -0,0 +1,50 @@
+/*
+ * Copyright (c) 1999, 2000, 2001, 2002 Robert N. M. Watson
+ * Copyright (c) 2002 Networks Associates Technology, Inc.
+ * All rights reserved.
+ *
+ * This software was developed by Robert Watson for the TrustedBSD Project.
+ *
+ * This software was developed for the FreeBSD Project in part by NAI Labs,
+ * the Security Research Division of Network Associates, Inc. under
+ * DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as part of the DARPA
+ * CHATS research program.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. The names of the authors may not be used to endorse or promote
+ *    products derived from this software without specific prior written
+ *    permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * $FreeBSD$
+ */
+
+/*
+ * Eventually, these per-policy interfaces will be handled via a
+ * standard userland MAC module interface.
+ */
+
+int	 mac_biba_label_from_string __P((char *string, struct mac *label));
+char	*mac_biba_string_from_label __P((struct mac *label));
+int	 mac_mls_label_from_string __P((char *string, struct mac *label));
+char	*mac_mls_string_from_label __P((struct mac *label));
+int	 mac_te_label_from_string __P((char *string, struct mac *label));
+char	*mac_te_string_from_label __P((struct mac *label));
diff --git a/lib/libc/posix1e/mac_is_present.3 b/lib/libc/posix1e/mac_is_present.3
new file mode 100644
index 0000000..b7610ad
--- /dev/null
+++ b/lib/libc/posix1e/mac_is_present.3
@@ -0,0 +1,73 @@
+.\" Copyright (c) 2002 Networks Associates Technology, Inc.
+.\" All rights reserved.
+.\" 
+.\" This software was developed for the FreeBSD Project by Chris
+.\" Costello at Safeport Network Services and NAI Labs, the Security
+.\" Research Division of Network Associates, Inc. under DARPA/SPAWAR
+.\" contract N66001-01-C-8035 ("CBOSS"), as part of the DARPA CHATS
+.\" research program.
+.\" 
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 3. The name of the author may not be used to endorse or promote
+.\"    products derived from this software without specific prior written
+.\"    permission.
+.\" 
+.\" THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\" 
+.\" $FreeBSD$
+.Dd January 9, 2002
+.Dt MAC_IS_PRESENT_NP 3
+.Sh NAME
+.Nm mac_is_present_np
+.Nd report whether the running system has MAC support
+.Sh SYNOPSIS
+.In sys/mac.h
+.Ft int
+.Fn mac_is_present "const char *policyname"
+.Sh DESCRIPTION
+The
+.Fn mac_is_present_np
+function determines whether the currently-running kernel supports MAC for
+a given policy or not.
+If
+.Fa policyname
+is non-
+.Ns Dv NULL ,
+the presence of the named policy
+(e.g.
+.Dq biba , 
+.Dq mls ,
+.Dq te )
+is checked, otherwise the presence of any MAC policies at all is checked.
+.Sh RETURN VALUES
+If the system supports the given MAC policy, the value 1 is returned.
+If the specified MAC policy is not supported, the value 0 is returned.
+If an error occurs, the value -1 is returned.
+.Sh ERRORS
+.Bl -tag -width Er
+.It Bq Er EINVAL
+The value of
+.Fa policyname
+is not valid.
+.It Bq Er ENOMEM
+Insufficient memory was available to allocate internal storage.
+.El
+.Sh SEE ALSO
+.Xr mac 3
diff --git a/lib/libc/posix1e/mac_is_present_np.3 b/lib/libc/posix1e/mac_is_present_np.3
new file mode 100644
index 0000000..b7610ad
--- /dev/null
+++ b/lib/libc/posix1e/mac_is_present_np.3
@@ -0,0 +1,73 @@
+.\" Copyright (c) 2002 Networks Associates Technology, Inc.
+.\" All rights reserved.
+.\" 
+.\" This software was developed for the FreeBSD Project by Chris
+.\" Costello at Safeport Network Services and NAI Labs, the Security
+.\" Research Division of Network Associates, Inc. under DARPA/SPAWAR
+.\" contract N66001-01-C-8035 ("CBOSS"), as part of the DARPA CHATS
+.\" research program.
+.\" 
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 3. The name of the author may not be used to endorse or promote
+.\"    products derived from this software without specific prior written
+.\"    permission.
+.\" 
+.\" THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\" 
+.\" $FreeBSD$
+.Dd January 9, 2002
+.Dt MAC_IS_PRESENT_NP 3
+.Sh NAME
+.Nm mac_is_present_np
+.Nd report whether the running system has MAC support
+.Sh SYNOPSIS
+.In sys/mac.h
+.Ft int
+.Fn mac_is_present "const char *policyname"
+.Sh DESCRIPTION
+The
+.Fn mac_is_present_np
+function determines whether the currently-running kernel supports MAC for
+a given policy or not.
+If
+.Fa policyname
+is non-
+.Ns Dv NULL ,
+the presence of the named policy
+(e.g.
+.Dq biba , 
+.Dq mls ,
+.Dq te )
+is checked, otherwise the presence of any MAC policies at all is checked.
+.Sh RETURN VALUES
+If the system supports the given MAC policy, the value 1 is returned.
+If the specified MAC policy is not supported, the value 0 is returned.
+If an error occurs, the value -1 is returned.
+.Sh ERRORS
+.Bl -tag -width Er
+.It Bq Er EINVAL
+The value of
+.Fa policyname
+is not valid.
+.It Bq Er ENOMEM
+Insufficient memory was available to allocate internal storage.
+.El
+.Sh SEE ALSO
+.Xr mac 3
diff --git a/lib/libc/posix1e/mac_is_present_np.c b/lib/libc/posix1e/mac_is_present_np.c
new file mode 100644
index 0000000..8ffabe8
--- /dev/null
+++ b/lib/libc/posix1e/mac_is_present_np.c
@@ -0,0 +1,86 @@
+/*-
+ * Copyright (c) 2002 Networks Associates Technology, Inc.
+ * All rights reserved.
+ *
+ * This software was developed for the FreeBSD Project by NAI Labs, the
+ * Security Research Division of Network Associates, Inc. under
+ * DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as part of the DARPA
+ * CHATS research program.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote
+ *    products derived from this software without specific prior written
+ *    permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * $FreeBSD$
+ */
+#include <sys/types.h>
+#include <sys/errno.h>
+#include <sys/sysctl.h>
+
+#include <stdlib.h>
+#include <string.h>
+
+/*
+ * Simply test whether the TrustedBSD/MAC MIB tree is present; if so,
+ * return 1 to indicate that the system has MAC enabled overall or for
+ * a given policy.
+ */
+
+int
+mac_is_present_np(const char *policyname)
+{
+	int mib[5];
+	size_t siz;
+	char *mibname;
+	int error;
+
+	if (policyname != NULL) {
+		if (policyname[strcspn(policyname, ".=")] != '\0') {
+			errno = EINVAL;
+			return (-1);
+		}
+		mibname = malloc(sizeof("security.mac.") - 1 +
+		    strlen(policyname) + sizeof(".enabled"));
+		if (mibname == NULL)
+			return (-1);
+		strcpy(mibname, "security.mac.");
+		strcat(mibname, policyname);
+		strcat(mibname, ".enabled");
+		siz = 5;
+		error = sysctlnametomib(mibname, mib, &siz);
+		free(mibname);
+	} else {
+		siz = 3;
+		error = sysctlnametomib("security.mac", mib, &siz);
+	}
+	if (error == -1) {
+		switch (errno) {
+		case ENOTDIR:
+		case ENOENT:
+			return (0);
+		default:
+			return (error);
+		}
+	}
+	return (1);
+}
diff --git a/lib/libc/posix1e/mac_mls.c b/lib/libc/posix1e/mac_mls.c
new file mode 100644
index 0000000..78d7b99
--- /dev/null
+++ b/lib/libc/posix1e/mac_mls.c
@@ -0,0 +1,218 @@
+/*
+ * Copyright (c) 1999, 2000, 2001, 2002 Robert N. M. Watson
+ * Copyright (c) 2002 Networks Associates Technology, Inc.
+ * All rights reserved.
+ *
+ * This software was developed by Robert Watson for the TrustedBSD Project.
+ *
+ * This software was developed for the FreeBSD Project in part by NAI Labs,
+ * the Security Research Division of Network Associates, Inc. under
+ * DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as part of the DARPA
+ * CHATS research program.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. The names of the authors may not be used to endorse or promote
+ *    products derived from this software without specific prior written
+ *    permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * $FreeBSD$
+ */
+
+#include <sys/types.h>
+#include <sys/mac.h>
+
+#include <security/mac_mls/mac_mls.h>
+
+#include <errno.h>
+#include <stdlib.h>
+#include <string.h>
+
+/*
+ * MLS labels take the following format:
+ * [optional mlssingle][optional mlsrange]
+ * mlssingle: {low,0-65535,high,equal}
+ * mlsrange: ([mlssingle]-[mlssingle])
+ */
+
+/*
+ * Extract mac_mls_element contents from a string.
+ */
+static int
+mac_mls_element_from_string(char *string, struct mac_mls_element *element)
+{
+	unsigned long value;
+	char *endp;
+	int error;
+
+	if (strcmp(string, "low") == 0) {
+		element->mme_type = MAC_MLS_TYPE_LOW;
+		element->mme_level = 0;
+		error = 0;
+	} else if (strcmp(string, "high") == 0) {
+		element->mme_type = MAC_MLS_TYPE_HIGH;
+		element->mme_level = 0;
+		error = 0;
+	} else if (strcmp(string, "equal") == 0) {
+		element->mme_type = MAC_MLS_TYPE_EQUAL;
+		element->mme_level = 0;
+		error = 0;
+	} else {
+		value = strtoul(string, &endp, 10);
+		if (*endp == '\0' && value == (u_short) value) {
+			element->mme_type = MAC_MLS_TYPE_LEVEL;
+			element->mme_level = value;
+			error = 0;
+		} else
+			error = EINVAL;
+	}
+
+	return (error);
+}
+
+/*
+ * Destructively convert a string into a mac_mls.
+ */
+int
+mac_mls_label_from_string(char *string, struct mac *label)
+{
+	char *string_single, *string_rangelow, *string_rangehigh;
+	int error;
+
+	bzero(&label->m_mls, sizeof(label->m_mls));
+
+	/*
+	 * Is a '(' present?, if so check for last character of ')', and
+	 * split into single and range strings after nulling the '(' and
+	 * ')'.  Reject if appropriate.
+	 */
+
+	string_single = strsep(&string, "(");
+	if (*string_single == '\0' && string == NULL) {
+		/* No interesting elements to parse, flags already zero'd. */
+		return (0);
+	}
+	if (string != NULL) {
+		/* If a '(' was present, last character must be ')'. */
+		if (*string == '\0')
+			return (EINVAL);
+		if (string[strlen(string)-1] != ')')
+			return (EINVAL);
+		string[strlen(string)-1] = '\0';
+	}
+
+	/*
+	 * If range is present, split range into rangelow and rangehigh
+	 * based on '-', if present, and nul it.  Process range elements.
+	 * Reject if appropriate.
+	 */
+	if (string != NULL) {
+		string_rangehigh = string;
+		string_rangelow = strsep(&string_rangehigh, "-");
+		if (*string_rangelow == '\0' || string_rangehigh == NULL)
+			return (EINVAL);
+		error = mac_mls_element_from_string(string_rangelow,
+		    &label->m_mls.mm_rangelow);
+		if (error)
+			return (error);
+		error = mac_mls_element_from_string(string_rangehigh,
+		    &label->m_mls.mm_rangehigh);
+		if (error)
+			return (error);
+		label->m_mls.mm_flags |= MAC_MLS_FLAG_RANGE;
+	}
+
+	/*
+	 * If single is present, process single and reject if needed.
+	 */
+	if (*string_single != '\0') {
+		error = mac_mls_element_from_string(string_single,
+		    &label->m_mls.mm_single);
+		if (error)
+			return (error);
+		label->m_mls.mm_flags |= MAC_MLS_FLAG_SINGLE;
+	}
+
+	return (0);
+}
+
+static char *
+mac_mls_string_from_element(struct mac_mls_element *element)
+{
+	char *string;
+
+	switch(element->mme_type) {
+	case MAC_MLS_TYPE_LOW:
+		return (strdup("low"));
+
+	case MAC_MLS_TYPE_HIGH:
+		return (strdup("high"));
+
+	case MAC_MLS_TYPE_EQUAL:
+		return (strdup("equal"));
+
+	case MAC_MLS_TYPE_LEVEL:
+		asprintf(&string, "%d", element->mme_level);
+		return (string);
+
+	default:
+		return (strdup("invalid"));
+	}
+}
+
+char *
+mac_mls_string_from_label(struct mac *label)
+{
+	char *format_string = NULL;
+	char *string = NULL, *string_single = NULL, *string_rangelow = NULL;
+	char *string_rangehigh = NULL;
+
+	if (label->m_mls.mm_flags & MAC_MLS_FLAG_SINGLE) {
+		string_single = mac_mls_string_from_element(
+		    &label->m_mls.mm_single);
+	}
+	if (label->m_mls.mm_flags & MAC_MLS_FLAG_RANGE) {
+		string_rangelow = mac_mls_string_from_element(
+		    &label->m_mls.mm_rangelow);
+		string_rangehigh = mac_mls_string_from_element(
+		    &label->m_mls.mm_rangehigh);
+	}
+
+	if (string_rangelow && string_single) {
+		asprintf(&string, "%s(%s-%s)", string_single, string_rangelow,
+		    string_rangehigh);
+	} else if (string_rangelow) {
+		asprintf(&string, "(%s-%s)", string_rangelow,
+		    string_rangehigh);
+	} else if (string_single) {
+		asprintf(&string, "%s", string_single);
+	} else
+		string = strdup("");
+
+	if (string_single)
+		free(string_single);
+	if (string_rangelow)
+		free(string_rangelow);
+	if (string_rangehigh)
+		free(string_rangehigh);
+
+	return (string);
+}
diff --git a/lib/libc/posix1e/mac_sebsd.c b/lib/libc/posix1e/mac_sebsd.c
new file mode 100644
index 0000000..5a152bd
--- /dev/null
+++ b/lib/libc/posix1e/mac_sebsd.c
@@ -0,0 +1,67 @@
+/*
+ * Copyright (c) 1999, 2000, 2001, 2002 Robert N. M. Watson
+ * Copyright (c) 2002 Networks Associates Technology, Inc.
+ * All rights reserved.
+ *
+ * This software was developed by Robert Watson for the TrustedBSD Project.
+ *
+ * This software was developed for the FreeBSD Project in part by NAI Labs,
+ * the Security Research Division of Network Associates, Inc. under
+ * DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as part of the DARPA
+ * CHATS research program.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. The names of the authors may not be used to endorse or promote
+ *    products derived from this software without specific prior written
+ *    permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * $FreeBSD$
+ */
+
+#include <sys/types.h>
+#include <sys/mac.h>
+
+#include <errno.h>
+#include <stdlib.h>
+#include <string.h>
+
+/*
+ * SEBSD labels consist of a single psid_t.
+ */
+
+int
+mac_sebsd_label_from_string(char *string, struct mac *label)
+{
+
+	bzero(&label->m_sebsd, sizeof(label->m_sebsd));
+	return (sscanf(string, "%u", &label->m_sebsd.ms_psid) == 1 ? 0
+	    : errno);
+}
+
+char *
+mac_sebsd_string_from_label(struct mac *label)
+{
+	char *ret;
+
+	asprintf(&ret, "%u", label->m_sebsd.ms_psid);
+	return (ret);
+}
diff --git a/lib/libc/posix1e/mac_set.3 b/lib/libc/posix1e/mac_set.3
new file mode 100644
index 0000000..c747952
--- /dev/null
+++ b/lib/libc/posix1e/mac_set.3
@@ -0,0 +1,124 @@
+.\" Copyright (c) 2001 Networks Associates Technology, Inc.
+.\" All rights reserved.
+.\" 
+.\" This software was developed for the FreeBSD Project by Chris
+.\" Costello at Safeport Network Services and NAI Labs, the Security
+.\" Research Division of Network Associates, Inc. under DARPA/SPAWAR
+.\" contract N66001-01-C-8035 ("CBOSS"), as part of the DARPA CHATS
+.\" research program.
+.\" 
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 3. The name of the author may not be used to endorse or promote
+.\"    products derived from this software without specific prior written
+.\"    permission.
+.\" 
+.\" THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\" 
+.\" $FreeBSD$
+.Dd December 21, 2001
+.Dt MAC_SET 3
+.Sh NAME
+.Nm mac_set_file ,
+.Nm mac_set_fd ,
+.Nm mac_set_proc
+.Nd set the MAC label for a file or process
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In sys/mac.h
+.Ft int
+.Fn mac_set_file "const char *path_p" "mac_t label"
+.Ft int
+.Fn mac_set_fd "int fd" "mac_t label"
+.Ft int
+.Fn mac_set_proc "mac_t label"
+.Sh DESCRIPTION
+The
+.Fn mac_set_file
+and
+.Fn mac_set_fd
+functions associate a MAC label
+specified by
+.Fa label
+to the file referenced to by
+.Fa path_p ,
+or to the file descriptor
+.Fa fd ,
+respectively.  Note this function will
+fail on socket descriptors.  For information on
+setting MAC labels on socket descriptors see
+.Xr setsockopt 2 .
+The
+.Fn mac_set_proc
+function associates the MAC label
+specified by
+.Fa label
+to the calling process.
+.Pp
+A process is allowed to set a label for a file
+only if it has MAC write access to the file,
+and its effective user id is equal to
+the owner of the file,
+or has appropriate privileges.
+.Sh RETURN VALUES
+.Rv -std mac_set_fd mac_set_file mac_set_proc
+.Sh ERRORS
+.Bl -tag -width Er
+.It Bq Er EACCES
+MAC write access to the file is denied.
+.It Bq Er EBADF
+.Fa fd
+is not a valid file descriptor.
+.It Bq Er EINVAL
+.Fa label
+is not a valid MAC label.
+.It Bq Er EOPNOTSUPP
+Setting MAC labels is not supported
+by the file referenced by
+.Fa fd .
+.It Bq Er EPERM
+The calling process had insufficient privelege
+to change the MAC label.
+.It Bq Er EROFS
+File system for the object being modified
+is read only.
+.It Bq Er ENAMETOOLONG
+.\" XXX POSIX_NO_TRUNC?
+The length of the pathname in
+.Fa path_p
+exceeds
+.Dv PATH_MAX ,
+or a component of the pathname
+is longer than
+.Dv NAME_MAX .
+.It Bq Er ENOENT
+The file referenced by
+.Fa path_p
+does not exist.
+.It Bq Er ENOTDIR
+A component of the pathname
+referenced by
+.Fa path_p
+is not a directory.
+.Sh SEE_ALSO
+.Xr mac 3 ,
+.Xr mac_free 3 ,
+.Xr mac_text 3 ,
+.Xr mac_get 3
diff --git a/lib/libc/posix1e/mac_set.c b/lib/libc/posix1e/mac_set.c
new file mode 100644
index 0000000..fd94244
--- /dev/null
+++ b/lib/libc/posix1e/mac_set.c
@@ -0,0 +1,56 @@
+/*
+ * Copyright (c) 1999, 2000, 2001, 2002 Robert N. M. Watson
+ * All rights reserved.
+ *
+ * This software was developed by Robert Watson for the TrustedBSD Project.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. The names of the authors may not be used to endorse or promote
+ *    products derived from this software without specific prior written
+ *    permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * $FreeBSD$
+ */
+
+#include <sys/types.h>
+#include <sys/mac.h>
+
+int
+mac_set_file(const char *path_p, mac_t label)
+{
+
+	return (__mac_set_file(path_p, label));
+}
+
+int
+mac_set_fd(int fd, mac_t label)
+{
+
+	return (__mac_set_fd(fd, label));
+}
+
+int
+mac_set_proc(mac_t label)
+{
+
+	return (__mac_set_proc(label));
+}
diff --git a/lib/libc/posix1e/mac_te.c b/lib/libc/posix1e/mac_te.c
new file mode 100644
index 0000000..c74dbfb
--- /dev/null
+++ b/lib/libc/posix1e/mac_te.c
@@ -0,0 +1,70 @@
+/*
+ * Copyright (c) 1999, 2000, 2001, 2002 Robert N. M. Watson
+ * Copyright (c) 2002 Networks Associates Technology, Inc.
+ * All rights reserved.
+ *
+ * This software was developed by Robert Watson for the TrustedBSD Project.
+ *
+ * This software was developed for the FreeBSD Project in part by NAI Labs,
+ * the Security Research Division of Network Associates, Inc. under
+ * DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as part of the DARPA
+ * CHATS research program.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. The names of the authors may not be used to endorse or promote
+ *    products derived from this software without specific prior written
+ *    permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * $FreeBSD$
+ */
+
+#include <sys/types.h>
+#include <sys/mac.h>
+
+#include <errno.h>
+#include <stdlib.h>
+#include <string.h>
+
+/*
+ * TE labels simply consist of the typename.  The typename must not be
+ * the empty string, and must not exceed the length limit in the label.
+ */
+
+int
+mac_te_label_from_string(char *string, struct mac *label)
+{
+
+	bzero(&label->m_te, sizeof(label->m_te));
+	if (strlen(string) == 0)
+		return (EINVAL);
+	if (strlcpy(label->m_te.mt_type, string,
+	    sizeof(label->m_te.mt_type)) >= sizeof(label->m_te.mt_type))
+		return (EINVAL);
+	return (0);
+}
+
+char *
+mac_te_string_from_label(struct mac *label)
+{
+
+	return (strdup(label->m_te.mt_type));
+}
diff --git a/lib/libc/posix1e/mac_text.3 b/lib/libc/posix1e/mac_text.3
new file mode 100644
index 0000000..46aec34
--- /dev/null
+++ b/lib/libc/posix1e/mac_text.3
@@ -0,0 +1,169 @@
+.\" Copyright (c) 2001 Networks Associates Technology, Inc.
+.\" All rights reserved.
+.\" 
+.\" This software was developed for the FreeBSD Project by Chris
+.\" Costello at Safeport Network Services and NAI Labs, the Security
+.\" Research Division of Network Associates, Inc. under DARPA/SPAWAR
+.\" contract N66001-01-C-8035 ("CBOSS"), as part of the DARPA CHATS
+.\" research program.
+.\" 
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 3. The name of the author may not be used to endorse or promote
+.\"    products derived from this software without specific prior written
+.\"    permission.
+.\" 
+.\" THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\" 
+.\" $FreeBSD$
+.Dd December 21, 2001
+.Dt MAC_TEXT 3
+.Sh NAME
+.Nm mac_from_text ,
+.Nm mac_to_text
+.Nd convert MAC label to/from text representation
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In sys/mac.h
+.Ft mac_t
+.Fn mac_from_text "const char *text_p"
+.Ft "char *"
+.Fn mac_to_text "mac_t label" "size_t *len_p"
+.Sh DESCRIPTION
+The
+.Fn mac_from_text
+function converts the text representation of a label
+into a
+.Vt mac_t ,
+which must later be freed with
+.Xr mac_free .
+The
+.Fn mac_to_text
+function returns
+the text representation of
+.Fa label
+and sets
+.Fa *len_p
+to the length of the returned string.
+.Pp
+.Fx
+uses the following format
+for MAC policy text representations:
+.Pp
+.Dl Sy policy Ns No / Ns Sy qualifier
+.Pp
+Where
+.Sy policy
+can be one of
+.Dq biba ,
+.Dq mls ,
+or
+.Dq te .
+.Pp
+Valid labels can have the following arguments for
+.Sy qualifier ,
+depending on the value of
+.Sy policy .
+.Bl -tag -width "Policy" -offset indent
+.It Em Policy
+.Em Qualifier
+.It biba
+.Dq high ,
+.Dq low ,
+.Dq equal ,
+or a numeric grade.
+.It mls
+.Dq high ,
+.Dq low ,
+.Dq equal ,
+or a numeric level.
+.It te
+Types for
+.Dq te
+consist of a type name which must
+neither be empty nor exceed the length limit for the label.
+.El
+.Pp
+All policies must be present
+in a comma-separated list,
+but may be in any order
+(see
+.Sx EXAMPLES ) .
+.Sh RETURN VALUES
+The
+.Fn mac_from_text
+function returns a valid
+.Vt mac_t
+equivalent to
+the MAC label described in
+.Fa text_p
+upon success, and
+.Dv NULL
+upon failure, setting
+.Va errno
+to indicate the error.
+.Pp
+The
+.Fn mac_to_text
+function returns a string
+containing the text representation of
+.Fa label
+upon success, and
+.Dv NULL
+upon failure, setting
+.Va errno
+to indicate the error.
+.Sh EXAMPLES
+The following are valid MAC labels:
+.Bd -literal -offset indent
+biba/high,mls/low,te/none
+biba/low,mls/low,te/none
+biba/low,mls/3,te/none
+.Ed
+.Sh COMPATIBILITY
+POSIX.1e does not define
+a text format for text representations
+of MAC labels.
+.Sh ERRORS
+.Bl -tag -width Er
+.It Bq Er EINVAL
+An invalid policy or qualifier
+was specified in
+.Fa text_p ,
+or an invalid MAC label
+was specified in
+.Fa label .
+.It Bq Er ENOMEM
+Insufficient memory was available
+to allocate internal storage.
+.El
+.Sh SEE ALSO
+.Xr mac 3 ,
+.Xr mac_free 3 ,
+.Xr mac_get 3 ,
+.Xr mac_set 3
+.Sh STANDARDS
+POSIX.1e is described in IEEE POSIX.1e draft 17.
+Discussion of the draft
+continues on the cross-platform POSIX.1e implementation mailing list.
+To join this list, see the
+.Fx
+POSIX.1e implementation page
+for more information.
diff --git a/lib/libc/posix1e/mac_text.c b/lib/libc/posix1e/mac_text.c
new file mode 100644
index 0000000..3ab6484d
--- /dev/null
+++ b/lib/libc/posix1e/mac_text.c
@@ -0,0 +1,182 @@
+/*
+ * Copyright (c) 1999, 2000, 2001, 2002 Robert N. M. Watson
+ * Copyright (c) 2002 Networks Associates Technology, Inc.
+ * All rights reserved.
+ *
+ * This software was developed by Robert Watson for the TrustedBSD Project.
+ *
+ * This software was developed for the FreeBSD Project in part by NAI Labs,
+ * the Security Research Division of Network Associates, Inc. under
+ * DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as part of the DARPA
+ * CHATS research program.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. The names of the authors may not be used to endorse or promote
+ *    products derived from this software without specific prior written
+ *    permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * $FreeBSD$
+ */
+
+#include <sys/types.h>
+#include <sys/mac.h>
+
+#include <errno.h>
+#include <stdio.h>
+#include <string.h>
+
+#include "mac_internal.h"
+
+/*
+ * POSIX.1e does not define a text format for MAC label string conversions.
+ * We use the following format:
+ *
+ * label: policyname/policyvalue{,...}
+ *
+ * Each policy is responsible for parsing policyvalue on its own, although
+ * policies must not use '/' or ',' in their text representation.  Currently
+ * supported policies are "biba, "mls", "te".
+ */
+
+#define	STRING_LISTSEP		","
+#define	STRING_ELEMENTSEP	"/"
+
+#define	STRING_BIBA		"biba"
+#define	STRING_MLS		"mls"
+#define	STRING_TE		"te"
+
+char *
+mac_to_text(struct mac *mac_p, size_t *len_p)
+{
+	char *biba = NULL, *mls = NULL, *string = NULL, *te = NULL;
+	int len = -1;
+
+	biba = mac_biba_string_from_label(mac_p);
+	if (biba == NULL)
+		goto out;
+
+	mls = mac_mls_string_from_label(mac_p);
+	if (mls == NULL)
+		goto out;
+
+	te = mac_te_string_from_label(mac_p);
+	if (te == NULL)
+		goto out;
+
+	len = asprintf(&string, "%s%s%s%s%s%s%s%s%s%s%s",
+	    STRING_BIBA, STRING_ELEMENTSEP, biba, STRING_LISTSEP,
+	    STRING_MLS, STRING_ELEMENTSEP, mls, STRING_LISTSEP,
+	    STRING_TE, STRING_ELEMENTSEP, te);
+
+out:
+	if (biba != NULL)
+		free(biba);
+	if (mls != NULL)
+		free(mls);
+	if (te != NULL)
+		free(te);
+
+	if (len != -1 && len_p != NULL)
+		*len_p = len;
+
+	return (string);
+}
+
+struct mac *
+mac_from_text(const char *text_p)
+{
+	struct mac *label;
+	char *local_string, *next_token, *token, *tmp;
+	char *policy_name, *policy_value;
+	int biba_seen = 0, mls_seen = 0, te_seen = 0;
+	int error;
+
+	/*
+	 * Parse into three assignments, determine which assignments
+	 * they are and recurse appropriately, and reject if there are
+	 * not the right assignments (or duplicates).
+	 */
+
+	label = (struct mac *) malloc(sizeof(*label));
+	if (label == NULL) {
+		errno = ENOMEM;
+		goto exit1;
+	}
+	label->m_macflags = 0;
+	label->m_macflags |= MAC_FLAG_INITIALIZED;
+
+	local_string = strdup(text_p);
+	if (local_string == NULL) {
+		errno = ENOMEM;
+		goto exit2;
+	}
+
+	next_token = local_string;
+	while ((token = strsep(&next_token, STRING_LISTSEP)) != NULL) {
+
+		policy_value = token;
+		policy_name = strsep(&policy_value, STRING_ELEMENTSEP);
+
+		if (strcmp(policy_name, STRING_BIBA) == 0) {
+			error = mac_biba_label_from_string(policy_value,
+			    label);
+			if (error) {
+				errno = error;
+				goto exit2;
+			}
+			biba_seen++;
+		} else if (strcmp(policy_name, STRING_MLS) == 0) {
+			error = mac_mls_label_from_string(policy_value,
+			    label);
+			if (error) {
+				errno = error;
+				goto exit2;
+			}
+			mls_seen++;
+		} else if (strcmp(policy_name, STRING_TE) == 0) {
+			error = mac_te_label_from_string(policy_value, label);
+			if (error) {
+				errno = error;
+				goto exit2;
+			}
+			te_seen++;
+		} else {
+			errno = EINVAL;
+			goto exit2;
+		}
+	}
+
+	if (biba_seen != 1 || mls_seen != 1 || te_seen != 1) {
+		errno = EINVAL;
+		goto exit2;
+	}
+
+	/* Success. */
+	goto exit1;
+
+exit2:
+	free(label);
+	label = NULL;
+exit1:
+	free(local_string);
+	return (label);
+}