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/*
* 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.
*/
#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>
void log_error(int flags, const char *fmt, ...) __attribute__((__noreturn__));
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
bsm_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
bsm_audit_failure(char **exec_args, char const *const fmt, va_list ap)
{
auditinfo_addr_t ainfo_addr;
auditinfo_t ainfo;
char text[256];
token_t *tok;
long au_cond;
au_id_t auid;
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);
(void) vsnprintf(text, sizeof(text), fmt, 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");
}
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