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hostap/src/ap/accounting.c
Jouni Malinen debde14b5b RADIUS: Add Acct-Delay-Time into accounting messages 
This tells to the server how long we have been trying to transmit the
message so that the actual time of the message generation can be
determined from receive time (ignoring network delays and only at
accuracy of one second).

For interim updates, only value 0 is used since there are no
retransmissions of the same message. For other accounting messages, the
initial attempt goes out with value 0 and the retransmissions, if
needed, show the number of seconds the message has been waiting in the
queue.

Update the Identifier and Authenticator in the messages whenever
updating the Acct-Delay-Time per RFC 2866, 4.1 requirements.

Signed-off-by: Jouni Malinen <j@w1.fi>
2016-02-29 17:43:13 +02:00

549 lines
15 KiB
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/*
* hostapd / RADIUS Accounting
* Copyright (c) 2002-2009, 2012-2015, Jouni Malinen <j@w1.fi>
*
* This software may be distributed under the terms of the BSD license.
* See README for more details.
*/
#include "utils/includes.h"
#include "utils/common.h"
#include "utils/eloop.h"
#include "eapol_auth/eapol_auth_sm.h"
#include "eapol_auth/eapol_auth_sm_i.h"
#include "radius/radius.h"
#include "radius/radius_client.h"
#include "hostapd.h"
#include "ieee802_1x.h"
#include "ap_config.h"
#include "sta_info.h"
#include "ap_drv_ops.h"
#include "accounting.h"
/* Default interval in seconds for polling TX/RX octets from the driver if
* STA is not using interim accounting. This detects wrap arounds for
* input/output octets and updates Acct-{Input,Output}-Gigawords. */
#define ACCT_DEFAULT_UPDATE_INTERVAL 300
static void accounting_sta_interim(struct hostapd_data *hapd,
struct sta_info *sta);
static struct radius_msg * accounting_msg(struct hostapd_data *hapd,
struct sta_info *sta,
int status_type)
{
struct radius_msg *msg;
char buf[128];
u8 *val;
size_t len;
int i;
struct wpabuf *b;
struct os_time now;
msg = radius_msg_new(RADIUS_CODE_ACCOUNTING_REQUEST,
radius_client_get_id(hapd->radius));
if (msg == NULL) {
wpa_printf(MSG_INFO, "Could not create new RADIUS packet");
return NULL;
}
if (radius_msg_make_authenticator(msg) < 0) {
wpa_printf(MSG_INFO, "Could not make Request Authenticator");
goto fail;
}
if (!radius_msg_add_attr_int32(msg, RADIUS_ATTR_ACCT_STATUS_TYPE,
status_type)) {
wpa_printf(MSG_INFO, "Could not add Acct-Status-Type");
goto fail;
}
if (sta) {
if (!hostapd_config_get_radius_attr(
hapd->conf->radius_acct_req_attr,
RADIUS_ATTR_ACCT_AUTHENTIC) &&
!radius_msg_add_attr_int32(msg, RADIUS_ATTR_ACCT_AUTHENTIC,
hapd->conf->ieee802_1x ?
RADIUS_ACCT_AUTHENTIC_RADIUS :
RADIUS_ACCT_AUTHENTIC_LOCAL)) {
wpa_printf(MSG_INFO, "Could not add Acct-Authentic");
goto fail;
}
/* Use 802.1X identity if available */
val = ieee802_1x_get_identity(sta->eapol_sm, &len);
/* Use RADIUS ACL identity if 802.1X provides no identity */
if (!val && sta->identity) {
val = (u8 *) sta->identity;
len = os_strlen(sta->identity);
}
/* Use STA MAC if neither 802.1X nor RADIUS ACL provided
* identity */
if (!val) {
os_snprintf(buf, sizeof(buf), RADIUS_ADDR_FORMAT,
MAC2STR(sta->addr));
val = (u8 *) buf;
len = os_strlen(buf);
}
if (!radius_msg_add_attr(msg, RADIUS_ATTR_USER_NAME, val,
len)) {
wpa_printf(MSG_INFO, "Could not add User-Name");
goto fail;
}
}
if (add_common_radius_attr(hapd, hapd->conf->radius_acct_req_attr, sta,
msg) < 0)
goto fail;
if (sta) {
for (i = 0; ; i++) {
val = ieee802_1x_get_radius_class(sta->eapol_sm, &len,
i);
if (val == NULL)
break;
if (!radius_msg_add_attr(msg, RADIUS_ATTR_CLASS,
val, len)) {
wpa_printf(MSG_INFO, "Could not add Class");
goto fail;
}
}
b = ieee802_1x_get_radius_cui(sta->eapol_sm);
if (b &&
!radius_msg_add_attr(msg,
RADIUS_ATTR_CHARGEABLE_USER_IDENTITY,
wpabuf_head(b), wpabuf_len(b))) {
wpa_printf(MSG_ERROR, "Could not add CUI");
goto fail;
}
if (!b && sta->radius_cui &&
!radius_msg_add_attr(msg,
RADIUS_ATTR_CHARGEABLE_USER_IDENTITY,
(u8 *) sta->radius_cui,
os_strlen(sta->radius_cui))) {
wpa_printf(MSG_ERROR, "Could not add CUI from ACL");
goto fail;
}
if (sta->ipaddr &&
!radius_msg_add_attr_int32(msg,
RADIUS_ATTR_FRAMED_IP_ADDRESS,
be_to_host32(sta->ipaddr))) {
wpa_printf(MSG_ERROR,
"Could not add Framed-IP-Address");
goto fail;
}
}
os_get_time(&now);
if (now.sec > 1000000000 &&
!radius_msg_add_attr_int32(msg, RADIUS_ATTR_EVENT_TIMESTAMP,
now.sec)) {
wpa_printf(MSG_INFO, "Could not add Event-Timestamp");
goto fail;
}
/*
* Add Acct-Delay-Time with zero value for the first transmission. This
* will be updated within radius_client.c when retransmitting the frame.
*/
if (!radius_msg_add_attr_int32(msg, RADIUS_ATTR_ACCT_DELAY_TIME, 0)) {
wpa_printf(MSG_INFO, "Could not add Acct-Delay-Time");
goto fail;
}
return msg;
fail:
radius_msg_free(msg);
return NULL;
}
static int accounting_sta_update_stats(struct hostapd_data *hapd,
struct sta_info *sta,
struct hostap_sta_driver_data *data)
{
if (hostapd_drv_read_sta_data(hapd, data, sta->addr))
return -1;
if (!data->bytes_64bit) {
/* Extend 32-bit counters from the driver to 64-bit counters */
if (sta->last_rx_bytes_lo > data->rx_bytes)
sta->last_rx_bytes_hi++;
sta->last_rx_bytes_lo = data->rx_bytes;
if (sta->last_tx_bytes_lo > data->tx_bytes)
sta->last_tx_bytes_hi++;
sta->last_tx_bytes_lo = data->tx_bytes;
}
hostapd_logger(hapd, sta->addr, HOSTAPD_MODULE_RADIUS,
HOSTAPD_LEVEL_DEBUG,
"updated TX/RX stats: rx_bytes=%llu [%u:%u] tx_bytes=%llu [%u:%u] bytes_64bit=%d",
data->rx_bytes, sta->last_rx_bytes_hi,
sta->last_rx_bytes_lo,
data->tx_bytes, sta->last_tx_bytes_hi,
sta->last_tx_bytes_lo,
data->bytes_64bit);
return 0;
}
static void accounting_interim_update(void *eloop_ctx, void *timeout_ctx)
{
struct hostapd_data *hapd = eloop_ctx;
struct sta_info *sta = timeout_ctx;
int interval;
if (sta->acct_interim_interval) {
accounting_sta_interim(hapd, sta);
interval = sta->acct_interim_interval;
} else {
struct hostap_sta_driver_data data;
accounting_sta_update_stats(hapd, sta, &data);
interval = ACCT_DEFAULT_UPDATE_INTERVAL;
}
eloop_register_timeout(interval, 0, accounting_interim_update,
hapd, sta);
}
/**
* accounting_sta_start - Start STA accounting
* @hapd: hostapd BSS data
* @sta: The station
*/
void accounting_sta_start(struct hostapd_data *hapd, struct sta_info *sta)
{
struct radius_msg *msg;
int interval;
if (sta->acct_session_started)
return;
hostapd_logger(hapd, sta->addr, HOSTAPD_MODULE_RADIUS,
HOSTAPD_LEVEL_INFO,
"starting accounting session %016llX",
(unsigned long long) sta->acct_session_id);
os_get_reltime(&sta->acct_session_start);
sta->last_rx_bytes_hi = 0;
sta->last_rx_bytes_lo = 0;
sta->last_tx_bytes_hi = 0;
sta->last_tx_bytes_lo = 0;
hostapd_drv_sta_clear_stats(hapd, sta->addr);
if (!hapd->conf->radius->acct_server)
return;
if (sta->acct_interim_interval)
interval = sta->acct_interim_interval;
else
interval = ACCT_DEFAULT_UPDATE_INTERVAL;
eloop_register_timeout(interval, 0, accounting_interim_update,
hapd, sta);
msg = accounting_msg(hapd, sta, RADIUS_ACCT_STATUS_TYPE_START);
if (msg &&
radius_client_send(hapd->radius, msg, RADIUS_ACCT, sta->addr) < 0)
radius_msg_free(msg);
sta->acct_session_started = 1;
}
static void accounting_sta_report(struct hostapd_data *hapd,
struct sta_info *sta, int stop)
{
struct radius_msg *msg;
int cause = sta->acct_terminate_cause;
struct hostap_sta_driver_data data;
struct os_reltime now_r, diff;
u64 bytes;
if (!hapd->conf->radius->acct_server)
return;
msg = accounting_msg(hapd, sta,
stop ? RADIUS_ACCT_STATUS_TYPE_STOP :
RADIUS_ACCT_STATUS_TYPE_INTERIM_UPDATE);
if (!msg) {
wpa_printf(MSG_INFO, "Could not create RADIUS Accounting message");
return;
}
os_get_reltime(&now_r);
os_reltime_sub(&now_r, &sta->acct_session_start, &diff);
if (!radius_msg_add_attr_int32(msg, RADIUS_ATTR_ACCT_SESSION_TIME,
diff.sec)) {
wpa_printf(MSG_INFO, "Could not add Acct-Session-Time");
goto fail;
}
if (accounting_sta_update_stats(hapd, sta, &data) == 0) {
if (!radius_msg_add_attr_int32(msg,
RADIUS_ATTR_ACCT_INPUT_PACKETS,
data.rx_packets)) {
wpa_printf(MSG_INFO, "Could not add Acct-Input-Packets");
goto fail;
}
if (!radius_msg_add_attr_int32(msg,
RADIUS_ATTR_ACCT_OUTPUT_PACKETS,
data.tx_packets)) {
wpa_printf(MSG_INFO, "Could not add Acct-Output-Packets");
goto fail;
}
if (data.bytes_64bit)
bytes = data.rx_bytes;
else
bytes = ((u64) sta->last_rx_bytes_hi << 32) |
sta->last_rx_bytes_lo;
if (!radius_msg_add_attr_int32(msg,
RADIUS_ATTR_ACCT_INPUT_OCTETS,
(u32) bytes)) {
wpa_printf(MSG_INFO, "Could not add Acct-Input-Octets");
goto fail;
}
if (!radius_msg_add_attr_int32(msg,
RADIUS_ATTR_ACCT_INPUT_GIGAWORDS,
(u32) (bytes >> 32))) {
wpa_printf(MSG_INFO, "Could not add Acct-Input-Gigawords");
goto fail;
}
if (data.bytes_64bit)
bytes = data.tx_bytes;
else
bytes = ((u64) sta->last_tx_bytes_hi << 32) |
sta->last_tx_bytes_lo;
if (!radius_msg_add_attr_int32(msg,
RADIUS_ATTR_ACCT_OUTPUT_OCTETS,
(u32) bytes)) {
wpa_printf(MSG_INFO, "Could not add Acct-Output-Octets");
goto fail;
}
if (!radius_msg_add_attr_int32(msg,
RADIUS_ATTR_ACCT_OUTPUT_GIGAWORDS,
(u32) (bytes >> 32))) {
wpa_printf(MSG_INFO, "Could not add Acct-Output-Gigawords");
goto fail;
}
}
if (eloop_terminated())
cause = RADIUS_ACCT_TERMINATE_CAUSE_ADMIN_REBOOT;
if (stop && cause &&
!radius_msg_add_attr_int32(msg, RADIUS_ATTR_ACCT_TERMINATE_CAUSE,
cause)) {
wpa_printf(MSG_INFO, "Could not add Acct-Terminate-Cause");
goto fail;
}
if (radius_client_send(hapd->radius, msg,
stop ? RADIUS_ACCT : RADIUS_ACCT_INTERIM,
sta->addr) < 0)
goto fail;
return;
fail:
radius_msg_free(msg);
}
/**
* accounting_sta_interim - Send a interim STA accounting report
* @hapd: hostapd BSS data
* @sta: The station
*/
static void accounting_sta_interim(struct hostapd_data *hapd,
struct sta_info *sta)
{
if (sta->acct_session_started)
accounting_sta_report(hapd, sta, 0);
}
/**
* accounting_sta_stop - Stop STA accounting
* @hapd: hostapd BSS data
* @sta: The station
*/
void accounting_sta_stop(struct hostapd_data *hapd, struct sta_info *sta)
{
if (sta->acct_session_started) {
accounting_sta_report(hapd, sta, 1);
eloop_cancel_timeout(accounting_interim_update, hapd, sta);
hostapd_logger(hapd, sta->addr, HOSTAPD_MODULE_RADIUS,
HOSTAPD_LEVEL_INFO,
"stopped accounting session %016llX",
(unsigned long long) sta->acct_session_id);
sta->acct_session_started = 0;
}
}
int accounting_sta_get_id(struct hostapd_data *hapd, struct sta_info *sta)
{
return radius_gen_session_id((u8 *) &sta->acct_session_id,
sizeof(sta->acct_session_id));
}
/**
* accounting_receive - Process the RADIUS frames from Accounting Server
* @msg: RADIUS response message
* @req: RADIUS request message
* @shared_secret: RADIUS shared secret
* @shared_secret_len: Length of shared_secret in octets
* @data: Context data (struct hostapd_data *)
* Returns: Processing status
*/
static RadiusRxResult
accounting_receive(struct radius_msg *msg, struct radius_msg *req,
const u8 *shared_secret, size_t shared_secret_len,
void *data)
{
if (radius_msg_get_hdr(msg)->code != RADIUS_CODE_ACCOUNTING_RESPONSE) {
wpa_printf(MSG_INFO, "Unknown RADIUS message code");
return RADIUS_RX_UNKNOWN;
}
if (radius_msg_verify(msg, shared_secret, shared_secret_len, req, 0)) {
wpa_printf(MSG_INFO, "Incoming RADIUS packet did not have correct Authenticator - dropped");
return RADIUS_RX_INVALID_AUTHENTICATOR;
}
return RADIUS_RX_PROCESSED;
}
static void accounting_report_state(struct hostapd_data *hapd, int on)
{
struct radius_msg *msg;
if (!hapd->conf->radius->acct_server || hapd->radius == NULL)
return;
/* Inform RADIUS server that accounting will start/stop so that the
* server can close old accounting sessions. */
msg = accounting_msg(hapd, NULL,
on ? RADIUS_ACCT_STATUS_TYPE_ACCOUNTING_ON :
RADIUS_ACCT_STATUS_TYPE_ACCOUNTING_OFF);
if (!msg)
return;
if (hapd->acct_session_id) {
char buf[20];
os_snprintf(buf, sizeof(buf), "%016llX",
(unsigned long long) hapd->acct_session_id);
if (!radius_msg_add_attr(msg, RADIUS_ATTR_ACCT_SESSION_ID,
(u8 *) buf, os_strlen(buf)))
wpa_printf(MSG_ERROR, "Could not add Acct-Session-Id");
}
if (radius_client_send(hapd->radius, msg, RADIUS_ACCT, NULL) < 0)
radius_msg_free(msg);
}
static void accounting_interim_error_cb(const u8 *addr, void *ctx)
{
struct hostapd_data *hapd = ctx;
struct sta_info *sta;
unsigned int i, wait_time;
int res;
sta = ap_get_sta(hapd, addr);
if (!sta)
return;
sta->acct_interim_errors++;
if (sta->acct_interim_errors > 10 /* RADIUS_CLIENT_MAX_RETRIES */) {
wpa_printf(MSG_DEBUG,
"Interim RADIUS accounting update failed for " MACSTR
" - too many errors, abandon this interim accounting update",
MAC2STR(addr));
sta->acct_interim_errors = 0;
/* Next update will be tried after normal update interval */
return;
}
/*
* Use a shorter update interval as an improved retransmission mechanism
* for failed interim accounting updates. This allows the statistics to
* be updated for each retransmission.
*
* RADIUS client code has already waited RADIUS_CLIENT_FIRST_WAIT.
* Schedule the first retry attempt immediately and every following one
* with exponential backoff.
*/
if (sta->acct_interim_errors == 1) {
wait_time = 0;
} else {
wait_time = 3; /* RADIUS_CLIENT_FIRST_WAIT */
for (i = 1; i < sta->acct_interim_errors; i++)
wait_time *= 2;
}
res = eloop_deplete_timeout(wait_time, 0, accounting_interim_update,
hapd, sta);
if (res == 1)
wpa_printf(MSG_DEBUG,
"Interim RADIUS accounting update failed for " MACSTR
" (error count: %u) - schedule next update in %u seconds",
MAC2STR(addr), sta->acct_interim_errors, wait_time);
else if (res == 0)
wpa_printf(MSG_DEBUG,
"Interim RADIUS accounting update failed for " MACSTR
" (error count: %u)", MAC2STR(addr),
sta->acct_interim_errors);
else
wpa_printf(MSG_DEBUG,
"Interim RADIUS accounting update failed for " MACSTR
" (error count: %u) - no timer found", MAC2STR(addr),
sta->acct_interim_errors);
}
/**
* accounting_init: Initialize accounting
* @hapd: hostapd BSS data
* Returns: 0 on success, -1 on failure
*/
int accounting_init(struct hostapd_data *hapd)
{
if (radius_gen_session_id((u8 *) &hapd->acct_session_id,
sizeof(hapd->acct_session_id)) < 0)
return -1;
if (radius_client_register(hapd->radius, RADIUS_ACCT,
accounting_receive, hapd))
return -1;
radius_client_set_interim_error_cb(hapd->radius,
accounting_interim_error_cb, hapd);
accounting_report_state(hapd, 1);
return 0;
}
/**
* accounting_deinit: Deinitialize accounting
* @hapd: hostapd BSS data
*/
void accounting_deinit(struct hostapd_data *hapd)
{
accounting_report_state(hapd, 0);
}
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