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/*
* 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);
}
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