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/*
* SPDX-License-Identifier: ISC
*
* Copyright (c) 2009-2015 Todd C. Miller <Todd.Miller@sudo.ws>
* Copyright (c) 2009 Christian S.J. Peron
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
/*
* This is an open source non-commercial project. Dear PVS-Studio, please check it.
* PVS-Studio Static Code Analyzer for C, C++ and C#: http://www.viva64.com
*/
#include <config.h>
#ifdef HAVE_BSM_AUDIT
#include <sys/types.h> /* for pid_t */
#include <bsm/audit.h>
#include <bsm/libbsm.h>
#include <bsm/audit_uevents.h>
#include <stdio.h>
#include <stdarg.h>
#include <errno.h>
#include <unistd.h>
#include "sudoers.h"
#include "bsm_audit.h"
/*
* Solaris auditon() returns EINVAL if BSM audit not configured.
* OpenBSM returns ENOSYS for unimplemented options.
*/
#ifdef __sun
# define AUDIT_NOT_CONFIGURED EINVAL
#else
# define AUDIT_NOT_CONFIGURED ENOSYS
#endif
#ifdef __FreeBSD__
# define BSM_AUDIT_COMPAT
#endif
static au_event_t sudo_audit_event = AUE_sudo;
static int
audit_sudo_selected(int sorf)
{
auditinfo_addr_t ainfo_addr;
struct au_mask *mask;
int rc;
debug_decl(audit_sudo_selected, SUDOERS_DEBUG_AUDIT);
if (getaudit_addr(&ainfo_addr, sizeof(ainfo_addr)) < 0) {
#ifdef BSM_AUDIT_COMPAT
if (errno == ENOSYS) {
auditinfo_t ainfo;
/* Fall back to older BSM API. */
if (getaudit(&ainfo) < 0) {
sudo_warn("getaudit");
debug_return_int(-1);
}
mask = &ainfo.ai_mask;
} else
#endif /* BSM_AUDIT_COMPAT */
{
sudo_warn("getaudit_addr");
debug_return_int(-1);
}
} else {
mask = &ainfo_addr.ai_mask;
}
rc = au_preselect(sudo_audit_event, mask, sorf, AU_PRS_REREAD);
if (rc == -1) {
#if defined(__APPLE__) && defined(AUE_DARWIN_sudo)
/*
* Mac OS X 10.10 au_preselect() only accepts AUE_DARWIN_sudo.
*/
sudo_audit_event = AUE_DARWIN_sudo;
rc = au_preselect(sudo_audit_event, mask, sorf, AU_PRS_REREAD);
if (rc == -1)
#endif
sudo_warn("au_preselect");
}
debug_return_int(rc);
}
/*
* Returns 0 on success or -1 on error.
*/
int
bsm_audit_success(char *const exec_args[])
{
auditinfo_addr_t ainfo_addr;
token_t *tok;
au_id_t auid;
long au_cond;
int aufd, selected;
pid_t pid;
debug_decl(bsm_audit_success, SUDOERS_DEBUG_AUDIT);
/*
* 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 == AUDIT_NOT_CONFIGURED)
debug_return_int(0);
sudo_warn("%s", U_("Could not determine audit condition"));
debug_return_int(-1);
}
if (au_cond == AUC_NOAUDIT)
debug_return_int(0);
/*
* Check to see if the preselection masks are interested in seeing
* this event.
*/
selected = audit_sudo_selected(AU_PRS_SUCCESS);
if (selected != 1)
debug_return_int(!selected ? 0 : -1);
if (getauid(&auid) < 0) {
sudo_warn("getauid");
debug_return_int(-1);
}
if ((aufd = au_open()) == -1) {
sudo_warn("au_open");
debug_return_int(-1);
}
pid = getpid();
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);
#ifdef BSM_AUDIT_COMPAT
} else if (errno == ENOSYS) {
auditinfo_t ainfo;
/*
* NB: We should probably watch out for ERANGE here.
*/
if (getaudit(&ainfo) < 0) {
sudo_warn("getaudit");
debug_return_int(-1);
}
tok = au_to_subject(auid, geteuid(), getegid(), getuid(),
getuid(), pid, pid, &ainfo.ai_termid);
#endif /* BSM_AUDIT_COMPAT */
} else {
sudo_warn("getaudit_addr");
debug_return_int(-1);
}
if (tok == NULL) {
sudo_warn("au_to_subject");
debug_return_int(-1);
}
au_write(aufd, tok);
tok = au_to_exec_args((char **)exec_args);
if (tok == NULL) {
sudo_warn("au_to_exec_args");
debug_return_int(-1);
}
au_write(aufd, tok);
tok = au_to_return32(0, 0);
if (tok == NULL) {
sudo_warn("au_to_return32");
debug_return_int(-1);
}
au_write(aufd, tok);
#ifdef HAVE_AU_CLOSE_SOLARIS11
if (au_close(aufd, 1, sudo_audit_event, 0) == -1)
#else
if (au_close(aufd, 1, sudo_audit_event) == -1)
#endif
{
sudo_warn("%s", U_("unable to commit audit record"));
debug_return_int(-1);
}
debug_return_int(0);
}
/*
* Returns 0 on success or -1 on error.
*/
int
bsm_audit_failure(char *const exec_args[], const char *errmsg)
{
auditinfo_addr_t ainfo_addr;
token_t *tok;
long au_cond;
au_id_t auid;
pid_t pid;
int aufd;
debug_decl(bsm_audit_failure, SUDOERS_DEBUG_AUDIT);
/*
* 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 == AUDIT_NOT_CONFIGURED)
debug_return_int(0);
sudo_warn("%s", U_("Could not determine audit condition"));
debug_return_int(-1);
}
if (au_cond == AUC_NOAUDIT)
debug_return_int(0);
if (!audit_sudo_selected(AU_PRS_FAILURE))
debug_return_int(0);
if (getauid(&auid) < 0) {
sudo_warn("getauid");
debug_return_int(-1);
}
if ((aufd = au_open()) == -1) {
sudo_warn("au_open");
debug_return_int(-1);
}
pid = getpid();
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);
#ifdef BSM_AUDIT_COMPAT
} else if (errno == ENOSYS) {
auditinfo_t ainfo;
if (getaudit(&ainfo) < 0) {
sudo_warn("getaudit");
debug_return_int(-1);
}
tok = au_to_subject(auid, geteuid(), getegid(), getuid(),
getuid(), pid, pid, &ainfo.ai_termid);
#endif /* BSM_AUDIT_COMPAT */
} else {
sudo_warn("getaudit_addr");
debug_return_int(-1);
}
if (tok == NULL) {
sudo_warn("au_to_subject");
debug_return_int(-1);
}
au_write(aufd, tok);
tok = au_to_exec_args((char **)exec_args);
if (tok == NULL) {
sudo_warn("au_to_exec_args");
debug_return_int(-1);
}
au_write(aufd, tok);
tok = au_to_text((char *)errmsg);
if (tok == NULL) {
sudo_warn("au_to_text");
debug_return_int(-1);
}
au_write(aufd, tok);
tok = au_to_return32(EPERM, 1);
if (tok == NULL) {
sudo_warn("au_to_return32");
debug_return_int(-1);
}
au_write(aufd, tok);
#ifdef HAVE_AU_CLOSE_SOLARIS11
if (au_close(aufd, 1, sudo_audit_event, PAD_FAILURE) == -1)
#else
if (au_close(aufd, 1, sudo_audit_event) == -1)
#endif
{
sudo_warn("%s", U_("unable to commit audit record"));
debug_return_int(-1);
}
debug_return_int(0);
}
#endif /* HAVE_BSM_AUDIT */
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