| Current Path : /usr/src/contrib/openbsm/libbsm/ |
FreeBSD hs32.drive.ne.jp 9.1-RELEASE FreeBSD 9.1-RELEASE #1: Wed Jan 14 12:18:08 JST 2015 root@hs32.drive.ne.jp:/sys/amd64/compile/hs32 amd64 |
| Current File : //usr/src/contrib/openbsm/libbsm/bsm_control.c |
/*-
* Copyright (c) 2004, 2009 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 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_control.c#34 $
*/
#include <config/config.h>
#include <bsm/libbsm.h>
#include <ctype.h>
#include <errno.h>
#include <string.h>
#ifdef HAVE_PTHREAD_MUTEX_LOCK
#include <pthread.h>
#endif
#include <stdio.h>
#include <stdlib.h>
#ifndef HAVE_STRLCAT
#include <compat/strlcat.h>
#endif
#ifndef HAVE_STRLCPY
#include <compat/strlcpy.h>
#endif
#include <sys/stat.h>
/*
* Parse the contents of the audit_control file to return the audit control
* parameters. These static fields are protected by 'mutex'.
*/
static FILE *fp = NULL;
static char linestr[AU_LINE_MAX];
static char *delim = ":";
static char inacdir = 0;
static char ptrmoved = 0;
#ifdef HAVE_PTHREAD_MUTEX_LOCK
static pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER;
#endif
/*
* Audit policy string token table for au_poltostr() and au_strtopol().
*/
struct audit_polstr {
long ap_policy;
const char *ap_str;
};
static struct audit_polstr au_polstr[] = {
{ AUDIT_CNT, "cnt" },
{ AUDIT_AHLT, "ahlt" },
{ AUDIT_ARGV, "argv" },
{ AUDIT_ARGE, "arge" },
{ AUDIT_SEQ, "seq" },
{ AUDIT_WINDATA, "windata" },
{ AUDIT_USER, "user" },
{ AUDIT_GROUP, "group" },
{ AUDIT_TRAIL, "trail" },
{ AUDIT_PATH, "path" },
{ AUDIT_SCNT, "scnt" },
{ AUDIT_PUBLIC, "public" },
{ AUDIT_ZONENAME, "zonename" },
{ AUDIT_PERZONE, "perzone" },
{ -1, NULL }
};
/*
* Returns the string value corresponding to the given label from the
* configuration file.
*
* Must be called with mutex held.
*/
static int
getstrfromtype_locked(char *name, char **str)
{
char *type, *nl;
char *tokptr;
char *last;
*str = NULL;
if ((fp == NULL) && ((fp = fopen(AUDIT_CONTROL_FILE, "r")) == NULL))
return (-1); /* Error */
while (1) {
if (fgets(linestr, AU_LINE_MAX, fp) == NULL) {
if (ferror(fp))
return (-1);
return (0); /* EOF */
}
if (linestr[0] == '#')
continue;
/* Remove trailing new line character and white space. */
nl = strchr(linestr, '\0') - 1;
while (nl >= linestr && ('\n' == *nl || ' ' == *nl ||
'\t' == *nl)) {
*nl = '\0';
nl--;
}
tokptr = linestr;
if ((type = strtok_r(tokptr, delim, &last)) != NULL) {
if (strcmp(name, type) == 0) {
/* Found matching name. */
*str = strtok_r(NULL, delim, &last);
if (*str == NULL) {
errno = EINVAL;
return (-1); /* Parse error in file */
}
return (0); /* Success */
}
}
}
}
/*
* Convert a given time value with a multiplier (seconds, hours, days, years) to
* seconds. Return 0 on success.
*/
static int
au_timetosec(time_t *seconds, u_long value, char mult)
{
if (NULL == seconds)
return (-1);
switch(mult) {
case 's':
/* seconds */
*seconds = (time_t)value;
break;
case 'h':
/* hours */
*seconds = (time_t)value * 60 * 60;
break;
case 'd':
/* days */
*seconds = (time_t)value * 60 * 60 * 24;
break;
case 'y':
/* years. Add a day for each 4th (leap) year. */
*seconds = (time_t)value * 60 * 60 * 24 * 364 +
((time_t)value / 4) * 60 * 60 * 24;
break;
default:
return (-1);
}
return (0);
}
/*
* Convert a given disk space value with a multiplier (bytes, kilobytes,
* megabytes, gigabytes) to bytes. Return 0 on success.
*/
static int
au_spacetobytes(size_t *bytes, u_long value, char mult)
{
if (NULL == bytes)
return (-1);
switch(mult) {
case 'B':
case ' ':
/* Bytes */
*bytes = (size_t)value;
break;
case 'K':
/* Kilobytes */
*bytes = (size_t)value * 1024;
break;
case 'M':
/* Megabytes */
*bytes = (size_t)value * 1024 * 1024;
break;
case 'G':
/* Gigabytes */
*bytes = (size_t)value * 1024 * 1024 * 1024;
break;
default:
return (-1);
}
return (0);
}
/*
* Convert a policy to a string. Return -1 on failure, or >= 0 representing
* the actual size of the string placed in the buffer (excluding terminating
* nul).
*/
ssize_t
au_poltostr(int policy, size_t maxsize, char *buf)
{
int first = 1;
int i = 0;
if (maxsize < 1)
return (-1);
buf[0] = '\0';
do {
if (policy & au_polstr[i].ap_policy) {
if (!first && strlcat(buf, ",", maxsize) >= maxsize)
return (-1);
if (strlcat(buf, au_polstr[i].ap_str, maxsize) >=
maxsize)
return (-1);
first = 0;
}
} while (NULL != au_polstr[++i].ap_str);
return (strlen(buf));
}
/*
* Convert a string to a policy. Return -1 on failure (with errno EINVAL,
* ENOMEM) or 0 on success.
*/
int
au_strtopol(const char *polstr, int *policy)
{
char *bufp, *string;
char *buffer;
int i, matched;
*policy = 0;
buffer = strdup(polstr);
if (buffer == NULL)
return (-1);
bufp = buffer;
while ((string = strsep(&bufp, ",")) != NULL) {
matched = i = 0;
do {
if (strcmp(string, au_polstr[i].ap_str) == 0) {
*policy |= au_polstr[i].ap_policy;
matched = 1;
break;
}
} while (NULL != au_polstr[++i].ap_str);
if (!matched) {
free(buffer);
errno = EINVAL;
return (-1);
}
}
free(buffer);
return (0);
}
/*
* Rewind the file pointer to beginning.
*/
static void
setac_locked(void)
{
static time_t lastctime = 0;
struct stat sbuf;
ptrmoved = 1;
if (fp != NULL) {
/*
* Check to see if the file on disk has changed. If so,
* force a re-read of the file by closing it.
*/
if (fstat(fileno(fp), &sbuf) < 0)
goto closefp;
if (lastctime != sbuf.st_ctime) {
lastctime = sbuf.st_ctime;
closefp:
fclose(fp);
fp = NULL;
return;
}
fseek(fp, 0, SEEK_SET);
}
}
void
setac(void)
{
#ifdef HAVE_PTHREAD_MUTEX_LOCK
pthread_mutex_lock(&mutex);
#endif
setac_locked();
#ifdef HAVE_PTHREAD_MUTEX_LOCK
pthread_mutex_unlock(&mutex);
#endif
}
/*
* Close the audit_control file.
*/
void
endac(void)
{
#ifdef HAVE_PTHREAD_MUTEX_LOCK
pthread_mutex_lock(&mutex);
#endif
ptrmoved = 1;
if (fp != NULL) {
fclose(fp);
fp = NULL;
}
#ifdef HAVE_PTHREAD_MUTEX_LOCK
pthread_mutex_unlock(&mutex);
#endif
}
/*
* Return audit directory information from the audit control file.
*/
int
getacdir(char *name, int len)
{
char *dir;
int ret = 0;
/*
* Check if another function was called between successive calls to
* getacdir.
*/
#ifdef HAVE_PTHREAD_MUTEX_LOCK
pthread_mutex_lock(&mutex);
#endif
if (inacdir && ptrmoved) {
ptrmoved = 0;
if (fp != NULL)
fseek(fp, 0, SEEK_SET);
ret = 2;
}
if (getstrfromtype_locked(DIR_CONTROL_ENTRY, &dir) < 0) {
#ifdef HAVE_PTHREAD_MUTEX_LOCK
pthread_mutex_unlock(&mutex);
#endif
return (-2);
}
if (dir == NULL) {
#ifdef HAVE_PTHREAD_MUTEX_LOCK
pthread_mutex_unlock(&mutex);
#endif
return (-1);
}
if (strlen(dir) >= (size_t)len) {
#ifdef HAVE_PTHREAD_MUTEX_LOCK
pthread_mutex_unlock(&mutex);
#endif
return (-3);
}
strlcpy(name, dir, len);
#ifdef HAVE_PTHREAD_MUTEX_LOCK
pthread_mutex_unlock(&mutex);
#endif
return (ret);
}
/*
* Return the minimum free diskspace value from the audit control file.
*/
int
getacmin(int *min_val)
{
char *min;
#ifdef HAVE_PTHREAD_MUTEX_LOCK
pthread_mutex_lock(&mutex);
#endif
setac_locked();
if (getstrfromtype_locked(MINFREE_CONTROL_ENTRY, &min) < 0) {
#ifdef HAVE_PTHREAD_MUTEX_LOCK
pthread_mutex_unlock(&mutex);
#endif
return (-2);
}
if (min == NULL) {
#ifdef HAVE_PTHREAD_MUTEX_LOCK
pthread_mutex_unlock(&mutex);
#endif
return (1);
}
*min_val = atoi(min);
#ifdef HAVE_PTHREAD_MUTEX_LOCK
pthread_mutex_unlock(&mutex);
#endif
return (0);
}
/*
* Return the desired trail rotation size from the audit control file.
*/
int
getacfilesz(size_t *filesz_val)
{
char *str;
size_t val;
char mult;
int nparsed;
#ifdef HAVE_PTHREAD_MUTEX_LOCK
pthread_mutex_lock(&mutex);
#endif
setac_locked();
if (getstrfromtype_locked(FILESZ_CONTROL_ENTRY, &str) < 0) {
#ifdef HAVE_PTHREAD_MUTEX_LOCK
pthread_mutex_unlock(&mutex);
#endif
return (-2);
}
if (str == NULL) {
#ifdef HAVE_PTHREAD_MUTEX_LOCK
pthread_mutex_unlock(&mutex);
#endif
errno = EINVAL;
return (1);
}
/* Trim off any leading white space. */
while (*str == ' ' || *str == '\t')
str++;
nparsed = sscanf(str, "%ju%c", (uintmax_t *)&val, &mult);
switch (nparsed) {
case 1:
/* If no multiplier then assume 'B' (bytes). */
mult = 'B';
/* fall through */
case 2:
if (au_spacetobytes(filesz_val, val, mult) == 0)
break;
/* fall through */
default:
errno = EINVAL;
#ifdef HAVE_PTHREAD_MUTEX_LOCK
pthread_mutex_unlock(&mutex);
#endif
return (-1);
}
/*
* The file size must either be 0 or >= MIN_AUDIT_FILE_SIZE. 0
* indicates no rotation size.
*/
if (*filesz_val < 0 || (*filesz_val > 0 &&
*filesz_val < MIN_AUDIT_FILE_SIZE)) {
#ifdef HAVE_PTHREAD_MUTEX_LOCK
pthread_mutex_unlock(&mutex);
#endif
filesz_val = 0L;
errno = EINVAL;
return (-1);
}
#ifdef HAVE_PTHREAD_MUTEX_LOCK
pthread_mutex_unlock(&mutex);
#endif
return (0);
}
/*
* Return the system audit value from the audit contol file.
*/
int
getacflg(char *auditstr, int len)
{
char *str;
#ifdef HAVE_PTHREAD_MUTEX_LOCK
pthread_mutex_lock(&mutex);
#endif
setac_locked();
if (getstrfromtype_locked(FLAGS_CONTROL_ENTRY, &str) < 0) {
#ifdef HAVE_PTHREAD_MUTEX_LOCK
pthread_mutex_unlock(&mutex);
#endif
return (-2);
}
if (str == NULL) {
#ifdef HAVE_PTHREAD_MUTEX_LOCK
pthread_mutex_unlock(&mutex);
#endif
return (1);
}
if (strlen(str) >= (size_t)len) {
#ifdef HAVE_PTHREAD_MUTEX_LOCK
pthread_mutex_unlock(&mutex);
#endif
return (-3);
}
strlcpy(auditstr, str, len);
#ifdef HAVE_PTHREAD_MUTEX_LOCK
pthread_mutex_unlock(&mutex);
#endif
return (0);
}
/*
* Return the non attributable flags from the audit contol file.
*/
int
getacna(char *auditstr, int len)
{
char *str;
#ifdef HAVE_PTHREAD_MUTEX_LOCK
pthread_mutex_lock(&mutex);
#endif
setac_locked();
if (getstrfromtype_locked(NA_CONTROL_ENTRY, &str) < 0) {
#ifdef HAVE_PTHREAD_MUTEX_LOCK
pthread_mutex_unlock(&mutex);
#endif
return (-2);
}
if (str == NULL) {
#ifdef HAVE_PTHREAD_MUTEX_LOCK
pthread_mutex_unlock(&mutex);
#endif
return (1);
}
if (strlen(str) >= (size_t)len) {
#ifdef HAVE_PTHREAD_MUTEX_LOCK
pthread_mutex_unlock(&mutex);
#endif
return (-3);
}
strlcpy(auditstr, str, len);
#ifdef HAVE_PTHREAD_MUTEX_LOCK
pthread_mutex_unlock(&mutex);
#endif
return (0);
}
/*
* Return the policy field from the audit control file.
*/
int
getacpol(char *auditstr, size_t len)
{
char *str;
#ifdef HAVE_PTHREAD_MUTEX_LOCK
pthread_mutex_lock(&mutex);
#endif
setac_locked();
if (getstrfromtype_locked(POLICY_CONTROL_ENTRY, &str) < 0) {
#ifdef HAVE_PTHREAD_MUTEX_LOCK
pthread_mutex_unlock(&mutex);
#endif
return (-2);
}
if (str == NULL) {
#ifdef HAVE_PTHREAD_MUTEX_LOCK
pthread_mutex_unlock(&mutex);
#endif
return (-1);
}
if (strlen(str) >= len) {
#ifdef HAVE_PTHREAD_MUTEX_LOCK
pthread_mutex_unlock(&mutex);
#endif
return (-3);
}
strlcpy(auditstr, str, len);
#ifdef HAVE_PTHREAD_MUTEX_LOCK
pthread_mutex_unlock(&mutex);
#endif
return (0);
}
int
getachost(char *auditstr, size_t len)
{
char *str;
#ifdef HAVE_PTHREAD_MUTEX_LOCK
pthread_mutex_lock(&mutex);
#endif
setac_locked();
if (getstrfromtype_locked(AUDIT_HOST_CONTROL_ENTRY, &str) < 0) {
#ifdef HAVE_PTHREAD_MUTEX_LOCK
pthread_mutex_unlock(&mutex);
#endif
return (-2);
}
if (str == NULL) {
#ifdef HAVE_PTHREAD_MUTEX_LOCK
pthread_mutex_unlock(&mutex);
#endif
return (1);
}
if (strlen(str) >= len) {
#ifdef HAVE_PTHREAD_MUTEX_LOCK
pthread_mutex_unlock(&mutex);
#endif
return (-3);
}
strlcpy(auditstr, str, len);
#ifdef HAVE_PTHREAD_MUTEX_LOCK
pthread_mutex_unlock(&mutex);
#endif
return (0);
}
/*
* Set expiration conditions.
*/
static int
setexpirecond(time_t *age, size_t *size, u_long value, char mult)
{
if (isupper(mult) || ' ' == mult)
return (au_spacetobytes(size, value, mult));
else
return (au_timetosec(age, value, mult));
}
/*
* Return the expire-after field from the audit control file.
*/
int
getacexpire(int *andflg, time_t *age, size_t *size)
{
char *str;
int nparsed;
u_long val1, val2;
char mult1, mult2;
char andor[AU_LINE_MAX];
*age = 0L;
*size = 0LL;
*andflg = 0;
#ifdef HAVE_PTHREAD_MUTEX_LOCK
pthread_mutex_lock(&mutex);
#endif
setac_locked();
if (getstrfromtype_locked(EXPIRE_AFTER_CONTROL_ENTRY, &str) < 0) {
#ifdef HAVE_PTHREAD_MUTEX_LOCK
pthread_mutex_unlock(&mutex);
#endif
return (-2);
}
if (str == NULL) {
#ifdef HAVE_PTHREAD_MUTEX_LOCK
pthread_mutex_unlock(&mutex);
#endif
return (1);
}
/* First, trim off any leading white space. */
while (*str == ' ' || *str == '\t')
str++;
nparsed = sscanf(str, "%lu%c%[ \tadnorADNOR]%lu%c", &val1, &mult1,
andor, &val2, &mult2);
switch (nparsed) {
case 1:
/* If no multiplier then assume 'B' (Bytes). */
mult1 = 'B';
/* fall through */
case 2:
/* One expiration condition. */
if (setexpirecond(age, size, val1, mult1) != 0) {
#ifdef HAVE_PTHREAD_MUTEX_LOCK
pthread_mutex_unlock(&mutex);
#endif
return (-1);
}
break;
case 5:
/* Two expiration conditions. */
if (setexpirecond(age, size, val1, mult1) != 0 ||
setexpirecond(age, size, val2, mult2) != 0) {
#ifdef HAVE_PTHREAD_MUTEX_LOCK
pthread_mutex_unlock(&mutex);
#endif
return (-1);
}
if (strcasestr(andor, "and") != NULL)
*andflg = 1;
else if (strcasestr(andor, "or") != NULL)
*andflg = 0;
else {
#ifdef HAVE_PTHREAD_MUTEX_LOCK
pthread_mutex_unlock(&mutex);
#endif
return (-1);
}
break;
default:
#ifdef HAVE_PTHREAD_MUTEX_LOCK
pthread_mutex_unlock(&mutex);
#endif
return (-1);
}
#ifdef HAVE_PTHREAD_MUTEX_LOCK
pthread_mutex_unlock(&mutex);
#endif
return (0);
}