freebsd-skq/contrib/openbsm/libbsm/bsm_class.c
rwatson e52e71cb6e Merge OpenBSM alpha 4 from OpenBSM vendor branch to head, both
contrib/openbsm (svn merge) and src/sys/{bsm,security/audit} (manual
merge).  Add libauditd build parts and add to auditd's linkage;
force libbsm to build before libauditd.

OpenBSM history for imported revisions below for reference.

MFC after:      1 month
Sponsored by:   Apple Inc.
Obtained from:  TrustedBSD Project

OpenBSM 1.1 alpha 4

- With the addition of BSM error number mapping, we also need to map the
  local error number passed to audit_submit(3) to a BSM error number,
  rather than have the caller perform that conversion.
- Reallocate user audit events to avoid collisions with Solaris; adopt a
  more formal allocation scheme, and add some events allocated in Solaris
  that will be of immediate use on other platforms.
- Add an event for Calife.
- Add au_strerror(3), which allows generating strings for BSM errors
  directly, rather than requiring applications to map to the local error
  space, which might not be able to entirely represent the BSM error
  number space.
- Major auditd rewrite for launchd(8) support.  Add libauditd library
  that is shared between launchd and auditd.
- Add AUDIT_TRIGGER_INITIALIZE trigger (sent via 'audit -i') for
  (re)starting auditing under launchd(8) on Mac OS X.
- Add 'current' symlink to active audit trail.
- Add crash recovery of previous audit trail file when detected on audit
  startup that it has not been properly terminated.
- Add the event AUE_audit_recovery to indicated when an audit trail file
  has been recovered from not being properly terminated.  This event is
  stored in the new audit trail file and includes the path of recovered
  audit trail file.
- Mac OS X and FreeBSD dependent code in auditd.c is separated into
  auditd_darwin.c and auditd_fbsd.c files.
- Add an event for the posix_spawn(2) and fsgetpath(2) Mac OS X system
  calls.
- For Mac OS X, we use ASL(3) instead of syslog(3) for logging.
- Add support for NOTICE level logging.

OpenBSM 1.1 alpha 3

- Add two new functions, au_bsm_to_errno() and au_errno_to_bsm(), to map
  between BSM error numbers (largely the Solaris definitions) and local
  errno(2) values for 32-bit and 64-bit return tokens.  This is required
  as operating systems don't agree on some of the values of more recent
  error numbers.
- Fix a bug how au_to_exec_args(3) and au_to_exec_env(3) calculates the
  total size for the token.  This buge.
- Deprecated Darwin constants, such as TRAILER_PAD_MAGIC, removed.
2008-12-31 11:12:24 +00:00

303 lines
7.2 KiB
C

/*-
* 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#15 $
*/
#include <config/config.h>
#include <bsm/libbsm.h>
#include <string.h>
#ifdef HAVE_PTHREAD_MUTEX_LOCK
#include <pthread.h>
#endif
#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 = ":";
#ifdef HAVE_PTHREAD_MUTEX_LOCK
static pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER;
#endif
/*
* 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;
#ifdef HAVE_PTHREAD_MUTEX_LOCK
pthread_mutex_lock(&mutex);
#endif
cp = getauclassent_r_locked(c);
#ifdef HAVE_PTHREAD_MUTEX_LOCK
pthread_mutex_unlock(&mutex);
#endif
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;
#ifdef HAVE_PTHREAD_MUTEX_LOCK
pthread_mutex_lock(&mutex);
#endif
cp = getauclassent_r_locked(&c);
#ifdef HAVE_PTHREAD_MUTEX_LOCK
pthread_mutex_unlock(&mutex);
#endif
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)
{
#ifdef HAVE_PTHREAD_MUTEX_LOCK
pthread_mutex_lock(&mutex);
#endif
setauclass_locked();
#ifdef HAVE_PTHREAD_MUTEX_LOCK
pthread_mutex_unlock(&mutex);
#endif
}
/*
* 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);
#ifdef HAVE_PTHREAD_MUTEX_LOCK
pthread_mutex_lock(&mutex);
#endif
setauclass_locked();
while ((cp = getauclassent_r_locked(c)) != NULL) {
if (strcmp(name, cp->ac_name) == 0) {
#ifdef HAVE_PTHREAD_MUTEX_LOCK
pthread_mutex_unlock(&mutex);
#endif
return (cp);
}
}
#ifdef HAVE_PTHREAD_MUTEX_LOCK
pthread_mutex_unlock(&mutex);
#endif
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;
#ifdef HAVE_PTHREAD_MUTEX_LOCK
pthread_mutex_lock(&mutex);
#endif
setauclass_locked();
while ((cp = getauclassent_r_locked(c)) != NULL) {
if (class_number == cp->ac_class)
return (cp);
}
#ifdef HAVE_PTHREAD_MUTEX_LOCK
pthread_mutex_unlock(&mutex);
#endif
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)
{
#ifdef HAVE_PTHREAD_MUTEX_LOCK
pthread_mutex_lock(&mutex);
#endif
if (fp != NULL) {
fclose(fp);
fp = NULL;
}
#ifdef HAVE_PTHREAD_MUTEX_LOCK
pthread_mutex_unlock(&mutex);
#endif
}