/* -*- mode: c; c-basic-offset: 4; indent-tabs-mode: nil -*- */
/* plugins/audit/au_simple_main.c - Sample Audit plugin implementation */
/*
* Copyright (C) 2013 by the Massachusetts Institute of Technology.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* * 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 COPYRIGHT HOLDERS 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
* COPYRIGHT HOLDER 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.
*/
/*
* This is a demo implementation of Audit JSON-based module.
* It utilizes MIT Kerberos <kdc_j_encode.h> routines for JSON processing and
* the Fedora/Debian libaudit library for audit logs.
*/
#include <k5-int.h>
#include <krb5/audit_plugin.h>
#include <libaudit.h>
#include <kdc_j_encode.h>
krb5_error_code
audit_simple_initvt(krb5_context context, int maj_ver, int min_ver,
krb5_plugin_vtable vtable);
struct krb5_audit_moddata_st {
int fd;
};
/* Open connection to the audit system. Returns 0 on success. */
static krb5_error_code
open_au(krb5_audit_moddata *auctx_out)
{
krb5_error_code ret;
int fd = 0;
krb5_audit_moddata auctx;
auctx = k5calloc(1, sizeof(*auctx), &ret);
if (ret)
return ENOMEM;
fd = audit_open();
if (fd < 0)
return KRB5_PLUGIN_NO_HANDLE; /* audit module is unavailable */
auctx->fd = fd;
*auctx_out = auctx;
return 0;
}
/* Close connection to the audit system. Returns 0 on success. */
static krb5_error_code
close_au(krb5_audit_moddata auctx)
{
int fd = auctx->fd;
audit_close(fd);
return 0;
}
/* Log KDC-start event. Returns 0 on success. */
static krb5_error_code
j_kdc_start(krb5_audit_moddata auctx, krb5_boolean ev_success)
{
krb5_error_code ret = 0;
int local_type = AUDIT_USER_START;
int fd = auctx->fd;
char *jout = NULL;
if (fd < 0)
return KRB5_PLUGIN_NO_HANDLE; /* audit module is unavailable */
ret = kau_j_kdc_start(ev_success, &jout);
if (ret)
return ret;
if (audit_log_user_message(fd, local_type, jout,
NULL, NULL, NULL, ev_success) <= 0)
ret = EIO;
free(jout);
return ret;
}
/* Log KDC-stop event. Returns 0 on success. */
static krb5_error_code
j_kdc_stop(krb5_audit_moddata auctx, krb5_boolean ev_success)
{
krb5_error_code ret = 0;
int local_type = AUDIT_USER_END;
int fd = auctx->fd;
char *jout = NULL;
if (fd < 0)
return KRB5_PLUGIN_NO_HANDLE; /* audit module is unavailable */
ret = kau_j_kdc_stop(ev_success, &jout);
if (ret)
return ret;
if (audit_log_user_message(fd, local_type, jout,
NULL, NULL, NULL, ev_success) <= 0)
ret = EIO;
free(jout);
return ret;
}
/* Log AS_REQ event. Returns 0 on success */
static krb5_error_code
j_as_req(krb5_audit_moddata auctx, krb5_boolean ev_success,
krb5_audit_state *state)
{
krb5_error_code ret = 0;
int local_type = AUDIT_USER_AUTH;
int fd = auctx->fd;
char *jout = NULL;
if (fd < 0)
return KRB5_PLUGIN_NO_HANDLE; /* audit module is unavailable */
ret = kau_j_as_req(ev_success, state, &jout);
if (ret)
return ret;
if (audit_log_user_message(fd, local_type, jout,
NULL, NULL, NULL, ev_success) <= 0)
ret = EIO;
free(jout);
return ret;
}
/* Log TGS_REQ event. Returns 0 on success */
static krb5_error_code
j_tgs_req(krb5_audit_moddata auctx, krb5_boolean ev_success,
krb5_audit_state *state)
{
krb5_error_code ret = 0;
int local_type = AUDIT_USER_AUTH;
int fd = auctx->fd;
char *jout = NULL;
if (fd < 0)
return KRB5_PLUGIN_NO_HANDLE; /* audit module is unavailable */
ret = kau_j_tgs_req(ev_success, state, &jout);
if (ret)
return ret;
if (audit_log_user_message(fd, local_type, jout,
NULL, NULL, NULL, ev_success) <= 0)
ret = EIO;
free(jout);
return ret;
}
/* Log S4U2SELF event. Returns 0 on success */
static krb5_error_code
j_tgs_s4u2self(krb5_audit_moddata auctx, krb5_boolean ev_success,
krb5_audit_state *state)
{
krb5_error_code ret = 0;
int local_type = AUDIT_USER_AUTH;
int fd = auctx->fd;
char *jout = NULL;
if (fd < 0)
return KRB5_PLUGIN_NO_HANDLE; /* audit module is unavailable */
ret = kau_j_tgs_s4u2self(ev_success, state, &jout);
if (ret)
return ret;
if (audit_log_user_message(fd, local_type, jout,
NULL, NULL, NULL, ev_success) <= 0)
ret = EIO;
free(jout);
return ret;
}
/* Log S4U2PROXY event. Returns 0 on success */
static krb5_error_code
j_tgs_s4u2proxy(krb5_audit_moddata auctx, krb5_boolean ev_success,
krb5_audit_state *state)
{
krb5_error_code ret = 0;
int local_type = AUDIT_USER_AUTH;
int fd = auctx->fd;
char *jout = NULL;
if (fd < 0)
return KRB5_PLUGIN_NO_HANDLE; /* audit module is unavailable */
ret = kau_j_tgs_s4u2proxy(ev_success, state, &jout);
if (ret)
return ret;
if (audit_log_user_message(fd, local_type, jout,
NULL, NULL, NULL, ev_success) <= 0)
ret = EIO;
free(jout);
return ret;
}
/* Log user-to-user event. Returns 0 on success */
static krb5_error_code
j_tgs_u2u(krb5_audit_moddata auctx, krb5_boolean ev_success,
krb5_audit_state *state)
{
krb5_error_code ret = 0;
int local_type = AUDIT_USER_AUTH;
int fd = auctx->fd;
char *jout = NULL;
if (fd < 0)
return KRB5_PLUGIN_NO_HANDLE; /* audit module is unavailable */
ret = kau_j_tgs_u2u(ev_success, state, &jout);
if (ret)
return ret;
if (audit_log_user_message(fd, local_type, jout,
NULL, NULL, NULL, ev_success) <= 0)
ret = EIO;
free(jout);
return ret;
}
krb5_error_code
audit_simple_initvt(krb5_context context, int maj_ver,
int min_ver, krb5_plugin_vtable vtable)
{
krb5_audit_vtable vt;
if (maj_ver != 1)
return KRB5_PLUGIN_VER_NOTSUPP;
vt = (krb5_audit_vtable)vtable;
vt->name = "simple";
vt->open = open_au;
vt->close = close_au;
vt->kdc_start = j_kdc_start;
vt->kdc_stop = j_kdc_stop;
vt->as_req = j_as_req;
vt->tgs_req = j_tgs_req;
vt->tgs_s4u2self = j_tgs_s4u2self;
vt->tgs_s4u2proxy = j_tgs_s4u2proxy;
vt->tgs_u2u = j_tgs_u2u;
return 0;
}