/*-
 * Copyright (c) 2008 Christian S.J. Peron
 * 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.
 *
 * 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.
 */
#include <config.h>

#include <sys/types.h>

#include <bsm/audit.h>
#include <bsm/libbsm.h>
#include <bsm/audit_uevents.h>

#include <stdio.h>
#include <string.h>
#include <stdarg.h>
#include <pwd.h>
#include <errno.h>
#include <unistd.h>

static int
audit_sudo_selected(int sf)
{
	auditinfo_addr_t ainfo_addr;
	struct au_mask *mask;
	auditinfo_t ainfo;
	int rc, sorf;

	if (getaudit_addr(&ainfo_addr, sizeof(ainfo_addr)) < 0) {
		if (errno == ENOSYS) {
			if (getaudit(&ainfo) < 0)
				log_error(0, "getaudit: failed");
			mask = &ainfo.ai_mask;
		} else
			log_error(0, "getaudit: failed");
        } else
		mask = &ainfo_addr.ai_mask;
	sorf = (sf == 0) ? AU_PRS_SUCCESS : AU_PRS_FAILURE;
	rc = au_preselect(AUE_sudo, mask, sorf, AU_PRS_REREAD);
        return (rc);
}

void
audit_success(char **exec_args)
{
	auditinfo_addr_t ainfo_addr;
	auditinfo_t ainfo;
	token_t *tok;
	au_id_t auid;
	long au_cond;
	int aufd;
	pid_t pid;

	pid = getpid();
	/*
	 * If we are not auditing, don't cut an audit record; just return.
	 */
	if (auditon(A_GETCOND, (caddr_t)&au_cond, sizeof(long)) < 0) {
		if (errno == ENOSYS)
			return;
		log_error(0, "Could not determine audit condition");
	}
	if (au_cond == AUC_NOAUDIT)
		return;
	/*
	 * Check to see if the preselection masks are interested in seeing
	 * this event.
	 */
	if (!audit_sudo_selected(0))
		return;
	if (getauid(&auid) < 0)
		log_error(0, "getauid failed");
	if ((aufd = au_open()) == -1)
		log_error(0, "au_open: failed");
	if (getaudit_addr(&ainfo_addr, sizeof(ainfo_addr)) == 0) {
		tok = au_to_subject_ex(auid, geteuid(), getegid(), getuid(),
		    getuid(), pid, pid, &ainfo_addr.ai_termid);
	} else if (errno == ENOSYS) {
		/*
		 * NB: We should probably watch out for ERANGE here.
		 */
		if (getaudit(&ainfo) < 0)
			log_error(0, "getaudit: failed");
		tok = au_to_subject(auid, geteuid(), getegid(), getuid(),
		    getuid(), pid, pid, &ainfo.ai_termid);
	} else
		log_error(0, "getaudit: failed");
	if (tok == NULL)
		log_error(0, "au_to_subject: failed");
	au_write(aufd, tok);
	tok = au_to_exec_args(exec_args);
	if (tok == NULL)
		log_error(0, "au_to_exec_args: failed");
	au_write(aufd, tok);
	tok = au_to_return32(0, 0);
	if (tok == NULL)
		log_error(0, "au_to_return32: failed");
	au_write(aufd, tok);
	if (au_close(aufd, 1, AUE_sudo) == -1)
		log_error(0, "unable to commit audit record");
}

void
audit_failure(char **exec_args, char const *const fmt, ...)
{
	auditinfo_addr_t ainfo_addr;
	auditinfo_t ainfo;
	char text[256];
	token_t *tok;
	long au_cond;
	au_id_t auid;
	va_list ap;
	pid_t pid;
	int aufd;

	pid = getpid();
	/*
	 * If we are not auditing, don't cut an audit record; just return.
	 */
	if (auditon(A_GETCOND, &au_cond, sizeof(long)) < 0) {
		if (errno == ENOSYS)
			return;
		log_error(0, "Could not determine audit condition");
	}
	if (au_cond == AUC_NOAUDIT)
		return;
	if (!audit_sudo_selected(1))
		return;
	if (getauid(&auid) < 0)
		log_error(0, "getauid: failed");
	if ((aufd = au_open()) == -1)
		log_error(0, "au_open: failed");
	if (getaudit_addr(&ainfo_addr, sizeof(ainfo_addr)) == 0) { 
		tok = au_to_subject_ex(auid, geteuid(), getegid(), getuid(),
		    getuid(), pid, pid, &ainfo_addr.ai_termid);
	} else if (errno == ENOSYS) {
		if (getaudit(&ainfo) < 0) 
			log_error(0, "getaudit: failed");
		tok = au_to_subject(auid, geteuid(), getegid(), getuid(),
		    getuid(), pid, pid, &ainfo.ai_termid);
	} else
		log_error(0, "getaudit: failed");
	if (tok == NULL)
		log_error(0, "au_to_subject: failed");
	au_write(aufd, tok);
	tok = au_to_exec_args(exec_args);
	if (tok == NULL)
		log_error(0, "au_to_exec_args: failed");
	au_write(aufd, tok);
	va_start(ap, fmt);
	(void) vsnprintf(text, sizeof(text), fmt, ap);
	va_end(ap);
	tok = au_to_text(text);
	if (tok == NULL)
		log_error(0, "au_to_text: failed");
	au_write(aufd, tok);
	tok = au_to_return32(EPERM, 1);
	if (tok == NULL)
		log_error(0, "au_to_return32: failed");
	au_write(aufd, tok);
	if (au_close(aufd, 1, AUE_sudo) == -1)
		log_error(0, "unable to commit audit record");
}