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/*
* Copyright (c) 2005-2016 Apple Inc. All rights reserved.
*
* @APPLE_BSD_LICENSE_HEADER_START@
*
* 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.
*
* @APPLE_BSD_LICENSE_HEADER_END@
*/
#ifdef USE_BSM_AUDIT
#include <sys/cdefs.h>
__FBSDID("$FreeBSD: src/usr.bin/login/login_audit.c,v 1.2 2007/05/07 11:01:36 dwmalone Exp $");
#include <sys/types.h>
#include <bsm/libbsm.h>
#include <bsm/audit_uevents.h>
#include <bsm/audit_session.h>
#include <err.h>
#include <errno.h>
#include <pwd.h>
#include <stdio.h>
#include <stdlib.h>
#include <strings.h>
#include <unistd.h>
#include "login.h"
/*
* Audit data
*/
au_tid_addr_t tid;
/*
* The following tokens are included in the audit record for a successful
* login: header, subject, return.
*/
void
au_login_success(int fflag)
{
token_t *tok;
int aufd;
auditinfo_addr_t auinfo;
uid_t uid = pwd->pw_uid;
gid_t gid = pwd->pw_gid;
pid_t pid = getpid();
long au_cond;
/* Determine whether auditing is enabled. */
if (auditon(A_GETCOND, &au_cond, sizeof(long)) < 0) {
if (errno == ENOSYS)
return;
errx(1, "login: Could not determine audit condition");
}
/* Initialize with the current audit info. */
if (getaudit_addr(&auinfo, sizeof(auinfo)) < 0) {
err(1, "getaudit_addr");
}
auinfo.ai_auid = pwd->pw_uid;
memcpy(&auinfo.ai_termid, &tid, sizeof(auinfo.ai_termid));
/* Do the SessionCreate() equivalent. */
if (!fflag) {
auinfo.ai_asid = AU_ASSIGN_ASID;
auinfo.ai_flags |= AU_SESSION_FLAG_HAS_TTY;
auinfo.ai_flags |= AU_SESSION_FLAG_HAS_AUTHENTICATED;
}
if (au_cond != AUC_NOAUDIT) {
/* Compute and set the user's preselection mask. */
if (au_user_mask(pwd->pw_name, &auinfo.ai_mask) < 0) {
errx(1, "login: Could not set audit mask\n");
}
}
if (setaudit_addr(&auinfo, sizeof(auinfo)) < 0)
err(1, "login: setaudit_addr failed");
char *session = NULL;
asprintf(&session, "%x", auinfo.ai_asid);
if (NULL == session) {
errx(1, "asprintf failed");
}
setenv("SECURITYSESSIONID", session, 1);
free(session);
/* If we are not auditing, don't cut an audit record; just return. */
if (au_cond == AUC_NOAUDIT)
return;
if ((aufd = au_open()) == -1)
errx(1,"login: Audit Error: au_open() failed");
if ((tok = au_to_subject32_ex(uid, geteuid(), getegid(), uid, gid, pid,
pid, &tid)) == NULL)
errx(1, "login: Audit Error: au_to_subject32() failed");
au_write(aufd, tok);
if ((tok = au_to_return32(0, 0)) == NULL)
errx(1, "login: Audit Error: au_to_return32() failed");
au_write(aufd, tok);
if (au_close(aufd, 1, AUE_login) == -1)
errx(1, "login: Audit Record was not committed.");
}
/*
* The following tokens are included in the audit record for failed
* login attempts: header, subject, text, return.
*/
void
au_login_fail(const char *errmsg, int na)
{
token_t *tok;
int aufd;
long au_cond;
uid_t uid;
gid_t gid;
pid_t 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;
errx(1, "login: Could not determine audit condition");
}
if (au_cond == AUC_NOAUDIT)
return;
if ((aufd = au_open()) == -1)
errx(1, "login: Audit Error: au_open() failed");
if (na) {
/*
* Non attributable event. Assuming that login is not called
* within a user's session => auid,asid == -1.
*/
if ((tok = au_to_subject32_ex(-1, geteuid(), getegid(), -1, -1,
pid, -1, &tid)) == NULL)
errx(1, "login: Audit Error: au_to_subject32() failed");
} else {
/* We know the subject -- so use its value instead. */
uid = pwd->pw_uid;
gid = pwd->pw_gid;
if ((tok = au_to_subject32_ex(uid, geteuid(), getegid(), uid,
gid, pid, pid, &tid)) == NULL)
errx(1, "login: Audit Error: au_to_subject32() failed");
}
au_write(aufd, tok);
/* Include the error message. */
if ((tok = au_to_text(errmsg)) == NULL)
errx(1, "login: Audit Error: au_to_text() failed");
au_write(aufd, tok);
if ((tok = au_to_return32(1, errno)) == NULL)
errx(1, "login: Audit Error: au_to_return32() failed");
au_write(aufd, tok);
if (au_close(aufd, 1, AUE_login) == -1)
errx(1, "login: Audit Error: au_close() was not committed");
}
/*
* The following tokens are included in the audit record for a logout:
* header, subject, return.
*/
void
audit_logout(void)
{
token_t *tok;
int aufd;
uid_t uid = pwd->pw_uid;
gid_t gid = pwd->pw_gid;
pid_t pid = getpid();
long au_cond;
/* 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;
errx(1, "login: Could not determine audit condition");
}
if (au_cond == AUC_NOAUDIT)
return;
if ((aufd = au_open()) == -1)
errx(1, "login: Audit Error: au_open() failed");
/* The subject that is created (euid, egid of the current process). */
if ((tok = au_to_subject32_ex(uid, geteuid(), getegid(), uid, gid, pid,
pid, &tid)) == NULL)
errx(1, "login: Audit Error: au_to_subject32() failed");
au_write(aufd, tok);
if ((tok = au_to_return32(0, 0)) == NULL)
errx(1, "login: Audit Error: au_to_return32() failed");
au_write(aufd, tok);
if (au_close(aufd, 1, AUE_logout) == -1)
errx(1, "login: Audit Record was not committed.");
}
#endif /* USE_BSM_AUDIT */
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