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/*-
* Copyright (c) 2004 Apple Inc.
* Copyright (c) 2006 Robert N. M. Watson
* All rights reserved.
*
* 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. Neither the name of Apple Computer, Inc. ("Apple") nor the names of
* its contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY APPLE AND ITS 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 APPLE OR ITS 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.
*
* $P4: //depot/projects/trustedbsd/openbsm/libbsm/bsm_class.c#14 $
*/
#include <config/config.h>
#include <bsm/libbsm.h>
#include <string.h>
#include <pthread.h>
#include <stdio.h>
#include <stdlib.h>
#ifndef HAVE_STRLCPY
#include <compat/strlcpy.h>
#endif
/*
* Parse the contents of the audit_class file to return struct au_class_ent
* entries.
*/
static FILE *fp = NULL;
static char linestr[AU_LINE_MAX];
static const char *classdelim = ":";
static pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER;
/*
* Parse a single line from the audit_class file passed in str to the struct
* au_class_ent elements; store the result in c.
*/
static struct au_class_ent *
classfromstr(char *str, struct au_class_ent *c)
{
char *classname, *classdesc, *classflag;
char *last;
/* Each line contains flag:name:desc. */
classflag = strtok_r(str, classdelim, &last);
classname = strtok_r(NULL, classdelim, &last);
classdesc = strtok_r(NULL, classdelim, &last);
if ((classflag == NULL) || (classname == NULL) || (classdesc == NULL))
return (NULL);
/*
* Check for very large classnames.
*/
if (strlen(classname) >= AU_CLASS_NAME_MAX)
return (NULL);
strlcpy(c->ac_name, classname, AU_CLASS_NAME_MAX);
/*
* Check for very large class description.
*/
if (strlen(classdesc) >= AU_CLASS_DESC_MAX)
return (NULL);
strlcpy(c->ac_desc, classdesc, AU_CLASS_DESC_MAX);
c->ac_class = strtoul(classflag, (char **) NULL, 0);
return (c);
}
/*
* Return the next au_class_ent structure from the file setauclass should be
* called before invoking this function for the first time.
*
* Must be called with mutex held.
*/
static struct au_class_ent *
getauclassent_r_locked(struct au_class_ent *c)
{
char *tokptr, *nl;
if ((fp == NULL) && ((fp = fopen(AUDIT_CLASS_FILE, "r")) == NULL))
return (NULL);
/*
* Read until next non-comment line is found, or EOF.
*/
while (1) {
if (fgets(linestr, AU_LINE_MAX, fp) == NULL)
return (NULL);
/* Skip comments. */
if (linestr[0] == '#')
continue;
/* Remove trailing new line character. */
if ((nl = strrchr(linestr, '\n')) != NULL)
*nl = '\0';
/* Parse tokptr to au_class_ent components. */
tokptr = linestr;
if (classfromstr(tokptr, c) == NULL)
return (NULL);
break;
}
return (c);
}
struct au_class_ent *
getauclassent_r(struct au_class_ent *c)
{
struct au_class_ent *cp;
pthread_mutex_lock(&mutex);
cp = getauclassent_r_locked(c);
pthread_mutex_unlock(&mutex);
return (cp);
}
struct au_class_ent *
getauclassent(void)
{
static char class_ent_name[AU_CLASS_NAME_MAX];
static char class_ent_desc[AU_CLASS_DESC_MAX];
static struct au_class_ent c, *cp;
bzero(&c, sizeof(c));
bzero(class_ent_name, sizeof(class_ent_name));
bzero(class_ent_desc, sizeof(class_ent_desc));
c.ac_name = class_ent_name;
c.ac_desc = class_ent_desc;
pthread_mutex_lock(&mutex);
cp = getauclassent_r_locked(&c);
pthread_mutex_unlock(&mutex);
return (cp);
}
/*
* Rewind to the beginning of the enumeration.
*
* Must be called with mutex held.
*/
static void
setauclass_locked(void)
{
if (fp != NULL)
fseek(fp, 0, SEEK_SET);
}
void
setauclass(void)
{
pthread_mutex_lock(&mutex);
setauclass_locked();
pthread_mutex_unlock(&mutex);
}
/*
* Return the next au_class_entry having the given class name.
*/
struct au_class_ent *
getauclassnam_r(struct au_class_ent *c, const char *name)
{
struct au_class_ent *cp;
if (name == NULL)
return (NULL);
pthread_mutex_lock(&mutex);
setauclass_locked();
while ((cp = getauclassent_r_locked(c)) != NULL) {
if (strcmp(name, cp->ac_name) == 0) {
pthread_mutex_unlock(&mutex);
return (cp);
}
}
pthread_mutex_unlock(&mutex);
return (NULL);
}
struct au_class_ent *
getauclassnam(const char *name)
{
static char class_ent_name[AU_CLASS_NAME_MAX];
static char class_ent_desc[AU_CLASS_DESC_MAX];
static struct au_class_ent c;
bzero(&c, sizeof(c));
bzero(class_ent_name, sizeof(class_ent_name));
bzero(class_ent_desc, sizeof(class_ent_desc));
c.ac_name = class_ent_name;
c.ac_desc = class_ent_desc;
return (getauclassnam_r(&c, name));
}
/*
* Return the next au_class_entry having the given class number.
*
* OpenBSM extension.
*/
struct au_class_ent *
getauclassnum_r(struct au_class_ent *c, au_class_t class_number)
{
struct au_class_ent *cp;
pthread_mutex_lock(&mutex);
setauclass_locked();
while ((cp = getauclassent_r_locked(c)) != NULL) {
if (class_number == cp->ac_class)
return (cp);
}
pthread_mutex_unlock(&mutex);
return (NULL);
}
struct au_class_ent *
getauclassnum(au_class_t class_number)
{
static char class_ent_name[AU_CLASS_NAME_MAX];
static char class_ent_desc[AU_CLASS_DESC_MAX];
static struct au_class_ent c;
bzero(&c, sizeof(c));
bzero(class_ent_name, sizeof(class_ent_name));
bzero(class_ent_desc, sizeof(class_ent_desc));
c.ac_name = class_ent_name;
c.ac_desc = class_ent_desc;
return (getauclassnum_r(&c, class_number));
}
/*
* audit_class processing is complete; close any open files.
*/
void
endauclass(void)
{
pthread_mutex_lock(&mutex);
if (fp != NULL) {
fclose(fp);
fp = NULL;
}
pthread_mutex_unlock(&mutex);
}
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