/*
* RADIUS client
* Copyright (c) 2002-2009, Jouni Malinen <j@w1.fi>
*
* This software may be distributed under the terms of the BSD license.
* See README for more details.
*/
#include "includes.h"
#include "common.h"
#include "radius.h"
#include "radius_client.h"
#include "eloop.h"
/* Defaults for RADIUS retransmit values (exponential backoff) */
/**
* RADIUS_CLIENT_FIRST_WAIT - RADIUS client timeout for first retry in seconds
*/
#define RADIUS_CLIENT_FIRST_WAIT 3
/**
* RADIUS_CLIENT_MAX_WAIT - RADIUS client maximum retry timeout in seconds
*/
#define RADIUS_CLIENT_MAX_WAIT 120
/**
* RADIUS_CLIENT_MAX_RETRIES - RADIUS client maximum retries
*
* Maximum number of retransmit attempts before the entry is removed from
* retransmit list.
*/
#define RADIUS_CLIENT_MAX_RETRIES 10
/**
* RADIUS_CLIENT_MAX_ENTRIES - RADIUS client maximum pending messages
*
* Maximum number of entries in retransmit list (oldest entries will be
* removed, if this limit is exceeded).
*/
#define RADIUS_CLIENT_MAX_ENTRIES 30
/**
* RADIUS_CLIENT_NUM_FAILOVER - RADIUS client failover point
*
* The number of failed retry attempts after which the RADIUS server will be
* changed (if one of more backup servers are configured).
*/
#define RADIUS_CLIENT_NUM_FAILOVER 4
/**
* struct radius_rx_handler - RADIUS client RX handler
*
* This data structure is used internally inside the RADIUS client module to
* store registered RX handlers. These handlers are registered by calls to
* radius_client_register() and unregistered when the RADIUS client is
* deinitialized with a call to radius_client_deinit().
*/
struct radius_rx_handler {
/**
* handler - Received RADIUS message handler
*/
RadiusRxResult (*handler)(struct radius_msg *msg,
struct radius_msg *req,
const u8 *shared_secret,
size_t shared_secret_len,
void *data);
/**
* data - Context data for the handler
*/
void *data;
};
/**
* struct radius_msg_list - RADIUS client message retransmit list
*
* This data structure is used internally inside the RADIUS client module to
* store pending RADIUS requests that may still need to be retransmitted.
*/
struct radius_msg_list {
/**
* addr - STA/client address
*
* This is used to find RADIUS messages for the same STA.
*/
u8 addr[ETH_ALEN];
/**
* msg - RADIUS message
*/
struct radius_msg *msg;
/**
* msg_type - Message type
*/
RadiusType msg_type;
/**
* first_try - Time of the first transmission attempt
*/
os_time_t first_try;
/**
* next_try - Time for the next transmission attempt
*/
os_time_t next_try;
/**
* attempts - Number of transmission attempts
*/
int attempts;
/**
* next_wait - Next retransmission wait time in seconds
*/
int next_wait;
/**
* last_attempt - Time of the last transmission attempt
*/
struct os_time last_attempt;
/**
* shared_secret - Shared secret with the target RADIUS server
*/
const u8 *shared_secret;
/**
* shared_secret_len - shared_secret length in octets
*/
size_t shared_secret_len;
/* TODO: server config with failover to backup server(s) */
/**
* next - Next message in the list
*/
struct radius_msg_list *next;
};
/**
* struct radius_client_data - Internal RADIUS client data
*
* This data structure is used internally inside the RADIUS client module.
* External users allocate this by calling radius_client_init() and free it by
* calling radius_client_deinit(). The pointer to this opaque data is used in
* calls to other functions as an identifier for the RADIUS client instance.
*/
struct radius_client_data {
/**
* ctx - Context pointer for hostapd_logger() callbacks
*/
void *ctx;
/**
* conf - RADIUS client configuration (list of RADIUS servers to use)
*/
struct hostapd_radius_servers *conf;
/**
* auth_serv_sock - IPv4 socket for RADIUS authentication messages
*/
int auth_serv_sock;
/**
* acct_serv_sock - IPv4 socket for RADIUS accounting messages
*/
int acct_serv_sock;
/**
* auth_serv_sock6 - IPv6 socket for RADIUS authentication messages
*/
int auth_serv_sock6;
/**
* acct_serv_sock6 - IPv6 socket for RADIUS accounting messages
*/
int acct_serv_sock6;
/**
* auth_sock - Currently used socket for RADIUS authentication server
*/
int auth_sock;
/**
* acct_sock - Currently used socket for RADIUS accounting server
*/
int acct_sock;
/**
* auth_handlers - Authentication message handlers
*/
struct radius_rx_handler *auth_handlers;
/**
* num_auth_handlers - Number of handlers in auth_handlers
*/
size_t num_auth_handlers;
/**
* acct_handlers - Accounting message handlers
*/
struct radius_rx_handler *acct_handlers;
/**
* num_acct_handlers - Number of handlers in acct_handlers
*/
size_t num_acct_handlers;
/**
* msgs - Pending outgoing RADIUS messages
*/
struct radius_msg_list *msgs;
/**
* num_msgs - Number of pending messages in the msgs list
*/
size_t num_msgs;
/**
* next_radius_identifier - Next RADIUS message identifier to use
*/
u8 next_radius_identifier;
};
static int
radius_change_server(struct radius_client_data *radius,
struct hostapd_radius_server *nserv,
struct hostapd_radius_server *oserv,
int sock, int sock6, int auth);
static int radius_client_init_acct(struct radius_client_data *radius);
static int radius_client_init_auth(struct radius_client_data *radius);
static void radius_client_msg_free(struct radius_msg_list *req)
{
radius_msg_free(req->msg);
os_free(req);
}
/**
* radius_client_register - Register a RADIUS client RX handler
* @radius: RADIUS client context from radius_client_init()
* @msg_type: RADIUS client type (RADIUS_AUTH or RADIUS_ACCT)
* @handler: Handler for received RADIUS messages
* @data: Context pointer for handler callbacks
* Returns: 0 on success, -1 on failure
*
* This function is used to register a handler for processing received RADIUS
* authentication and accounting messages. The handler() callback function will
* be called whenever a RADIUS message is received from the active server.
*
* There can be multiple registered RADIUS message handlers. The handlers will
* be called in order until one of them indicates that it has processed or
* queued the message.
*/
int radius_client_register(struct radius_client_data *radius,
RadiusType msg_type,
RadiusRxResult (*handler)(struct radius_msg *msg,
struct radius_msg *req,
const u8 *shared_secret,
size_t shared_secret_len,
void *data),
void *data)
{
struct radius_rx_handler **handlers, *newh;
size_t *num;
if (msg_type == RADIUS_ACCT) {
handlers = &radius->acct_handlers;
num = &radius->num_acct_handlers;
} else {
handlers = &radius->auth_handlers;
num = &radius->num_auth_handlers;
}
newh = os_realloc(*handlers,
(*num + 1) * sizeof(struct radius_rx_handler));
if (newh == NULL)
return -1;
newh[*num].handler = handler;
newh[*num].data = data;
(*num)++;
*handlers = newh;
return 0;
}
static void radius_client_handle_send_error(struct radius_client_data *radius,
int s, RadiusType msg_type)
{
#ifndef CONFIG_NATIVE_WINDOWS
int _errno = errno;
perror("send[RADIUS]");
if (_errno == ENOTCONN || _errno == EDESTADDRREQ || _errno == EINVAL ||
_errno == EBADF) {
hostapd_logger(radius->ctx, NULL, HOSTAPD_MODULE_RADIUS,
HOSTAPD_LEVEL_INFO,
"Send failed - maybe interface status changed -"
" try to connect again");
eloop_unregister_read_sock(s);
close(s);
if (msg_type == RADIUS_ACCT || msg_type == RADIUS_ACCT_INTERIM)
radius_client_init_acct(radius);
else
radius_client_init_auth(radius);
}
#endif /* CONFIG_NATIVE_WINDOWS */
}
static int radius_client_retransmit(struct radius_client_data *radius,
struct radius_msg_list *entry,
os_time_t now)
{
struct hostapd_radius_servers *conf = radius->conf;
int s;
struct wpabuf *buf;
if (entry->msg_type == RADIUS_ACCT ||
entry->msg_type == RADIUS_ACCT_INTERIM) {
s = radius->acct_sock;
if (entry->attempts == 0)
conf->acct_server->requests++;
else {
conf->acct_server->timeouts++;
conf->acct_server->retransmissions++;
}
} else {
s = radius->auth_sock;
if (entry->attempts == 0)
conf->auth_server->requests++;
else {
conf->auth_server->timeouts++;
conf->auth_server->retransmissions++;
}
}
/* retransmit; remove entry if too many attempts */
entry->attempts++;
hostapd_logger(radius->ctx, entry->addr, HOSTAPD_MODULE_RADIUS,
HOSTAPD_LEVEL_DEBUG, "Resending RADIUS message (id=%d)",
radius_msg_get_hdr(entry->msg)->identifier);
os_get_time(&entry->last_attempt);
buf = radius_msg_get_buf(entry->msg);
if (send(s, wpabuf_head(buf), wpabuf_len(buf), 0) < 0)
radius_client_handle_send_error(radius, s, entry->msg_type);
entry->next_try = now + entry->next_wait;
entry->next_wait *= 2;
if (entry->next_wait > RADIUS_CLIENT_MAX_WAIT)
entry->next_wait = RADIUS_CLIENT_MAX_WAIT;
if (entry->attempts >= RADIUS_CLIENT_MAX_RETRIES) {
printf("Removing un-ACKed RADIUS message due to too many "
"failed retransmit attempts\n");
return 1;
}
return 0;
}
static void radius_client_timer(void *eloop_ctx, void *timeout_ctx)
{
struct radius_client_data *radius = eloop_ctx;
struct hostapd_radius_servers *conf = radius->conf;
struct os_time now;
os_time_t first;
struct radius_msg_list *entry, *prev, *tmp;
int auth_failover = 0, acct_failover = 0;
char abuf[50];
entry = radius->msgs;
if (!entry)
return;
os_get_time(&now);
first = 0;
prev = NULL;
while (entry) {
if (now.sec >= entry->next_try &&
radius_client_retransmit(radius, entry, now.sec)) {
if (prev)
prev->next = entry->next;
else
radius->msgs = entry->next;
tmp = entry;
entry = entry->next;
radius_client_msg_free(tmp);
radius->num_msgs--;
continue;
}
if (entry->attempts > RADIUS_CLIENT_NUM_FAILOVER) {
if (entry->msg_type == RADIUS_ACCT ||
entry->msg_type == RADIUS_ACCT_INTERIM)
acct_failover++;
else
auth_failover++;
}
if (first == 0 || entry->next_try < first)
first = entry->next_try;
prev = entry;
entry = entry->next;
}
if (radius->msgs) {
if (first < now.sec)
first = now.sec;
eloop_register_timeout(first - now.sec, 0,
radius_client_timer, radius, NULL);
hostapd_logger(radius->ctx, NULL, HOSTAPD_MODULE_RADIUS,
HOSTAPD_LEVEL_DEBUG, "Next RADIUS client "
"retransmit in %ld seconds",
(long int) (first - now.sec));
}
if (auth_failover && conf->num_auth_servers > 1) {
struct hostapd_radius_server *next, *old;
old = conf->auth_server;
hostapd_logger(radius->ctx, NULL, HOSTAPD_MODULE_RADIUS,
HOSTAPD_LEVEL_NOTICE,
"No response from Authentication server "
"%s:%d - failover",
hostapd_ip_txt(&old->addr, abuf, sizeof(abuf)),
old->port);
for (entry = radius->msgs; entry; entry = entry->next) {
if (entry->msg_type == RADIUS_AUTH)
old->timeouts++;
}
next = old + 1;
if (next > &(conf->auth_servers[conf->num_auth_servers - 1]))
next = conf->auth_servers;
conf->auth_server = next;
radius_change_server(radius, next, old,
radius->auth_serv_sock,
radius->auth_serv_sock6, 1);
}
if (acct_failover && conf->num_acct_servers > 1) {
struct hostapd_radius_server *next, *old;
old = conf->acct_server;
hostapd_logger(radius->ctx, NULL, HOSTAPD_MODULE_RADIUS,
HOSTAPD_LEVEL_NOTICE,
"No response from Accounting server "
"%s:%d - failover",
hostapd_ip_txt(&old->addr, abuf, sizeof(abuf)),
old->port);
for (entry = radius->msgs; entry; entry = entry->next) {
if (entry->msg_type == RADIUS_ACCT ||
entry->msg_type == RADIUS_ACCT_INTERIM)
old->timeouts++;
}
next = old + 1;
if (next > &conf->acct_servers[conf->num_acct_servers - 1])
next = conf->acct_servers;
conf->acct_server = next;
radius_change_server(radius, next, old,
radius->acct_serv_sock,
radius->acct_serv_sock6, 0);
}
}
static void radius_client_update_timeout(struct radius_client_data *radius)
{
struct os_time now;
os_time_t first;
struct radius_msg_list *entry;
eloop_cancel_timeout(radius_client_timer, radius, NULL);
if (radius->msgs == NULL) {
return;
}
first = 0;
for (entry = radius->msgs; entry; entry = entry->next) {
if (first == 0 || entry->next_try < first)
first = entry->next_try;
}
os_get_time(&now);
if (first < now.sec)
first = now.sec;
eloop_register_timeout(first - now.sec, 0, radius_client_timer, radius,
NULL);
hostapd_logger(radius->ctx, NULL, HOSTAPD_MODULE_RADIUS,
HOSTAPD_LEVEL_DEBUG, "Next RADIUS client retransmit in"
" %ld seconds\n", (long int) (first - now.sec));
}
static void radius_client_list_add(struct radius_client_data *radius,
struct radius_msg *msg,
RadiusType msg_type,
const u8 *shared_secret,
size_t shared_secret_len, const u8 *addr)
{
struct radius_msg_list *entry, *prev;
if (eloop_terminated()) {
/* No point in adding entries to retransmit queue since event
* loop has already been terminated. */
radius_msg_free(msg);
return;
}
entry = os_zalloc(sizeof(*entry));
if (entry == NULL) {
printf("Failed to add RADIUS packet into retransmit list\n");
radius_msg_free(msg);
return;
}
if (addr)
os_memcpy(entry->addr, addr, ETH_ALEN);
entry->msg = msg;
entry->msg_type = msg_type;
entry->shared_secret = shared_secret;
entry->shared_secret_len = shared_secret_len;
os_get_time(&entry->last_attempt);
entry->first_try = entry->last_attempt.sec;
entry->next_try = entry->first_try + RADIUS_CLIENT_FIRST_WAIT;
entry->attempts = 1;
entry->next_wait = RADIUS_CLIENT_FIRST_WAIT * 2;
entry->next = radius->msgs;
radius->msgs = entry;
radius_client_update_timeout(radius);
if (radius->num_msgs >= RADIUS_CLIENT_MAX_ENTRIES) {
printf("Removing the oldest un-ACKed RADIUS packet due to "
"retransmit list limits.\n");
prev = NULL;
while (entry->next) {
prev = entry;
entry = entry->next;
}
if (prev) {
prev->next = NULL;
radius_client_msg_free(entry);
}
} else
radius->num_msgs++;
}
static void radius_client_list_del(struct radius_client_data *radius,
RadiusType msg_type, const u8 *addr)
{
struct radius_msg_list *entry, *prev, *tmp;
if (addr == NULL)
return;
entry = radius->msgs;
prev = NULL;
while (entry) {
if (entry->msg_type == msg_type &&
os_memcmp(entry->addr, addr, ETH_ALEN) == 0) {
if (prev)
prev->next = entry->next;
else
radius->msgs = entry->next;
tmp = entry;
entry = entry->next;
hostapd_logger(radius->ctx, addr,
HOSTAPD_MODULE_RADIUS,
HOSTAPD_LEVEL_DEBUG,
"Removing matching RADIUS message");
radius_client_msg_free(tmp);
radius->num_msgs--;
continue;
}
prev = entry;
entry = entry->next;
}
}
/**
* radius_client_send - Send a RADIUS request
* @radius: RADIUS client context from radius_client_init()
* @msg: RADIUS message to be sent
* @msg_type: Message type (RADIUS_AUTH, RADIUS_ACCT, RADIUS_ACCT_INTERIM)
* @addr: MAC address of the device related to this message or %NULL
* Returns: 0 on success, -1 on failure
*
* This function is used to transmit a RADIUS authentication (RADIUS_AUTH) or
* accounting request (RADIUS_ACCT or RADIUS_ACCT_INTERIM). The only difference
* between accounting and interim accounting messages is that the interim
* message will override any pending interim accounting updates while a new
* accounting message does not remove any pending messages.
*
* The message is added on the retransmission queue and will be retransmitted
* automatically until a response is received or maximum number of retries
* (RADIUS_CLIENT_MAX_RETRIES) is reached.
*
* The related device MAC address can be used to identify pending messages that
* can be removed with radius_client_flush_auth() or with interim accounting
* updates.
*/
int radius_client_send(struct radius_client_data *radius,
struct radius_msg *msg, RadiusType msg_type,
const u8 *addr)
{
struct hostapd_radius_servers *conf = radius->conf;
const u8 *shared_secret;
size_t shared_secret_len;
char *name;
int s, res;
struct wpabuf *buf;
if (msg_type == RADIUS_ACCT_INTERIM) {
/* Remove any pending interim acct update for the same STA. */
radius_client_list_del(radius, msg_type, addr);
}
if (msg_type == RADIUS_ACCT || msg_type == RADIUS_ACCT_INTERIM) {
if (conf->acct_server == NULL) {
hostapd_logger(radius->ctx, NULL,
HOSTAPD_MODULE_RADIUS,
HOSTAPD_LEVEL_INFO,
"No accounting server configured");
return -1;
}
shared_secret = conf->acct_server->shared_secret;
shared_secret_len = conf->acct_server->shared_secret_len;
radius_msg_finish_acct(msg, shared_secret, shared_secret_len);
name = "accounting";
s = radius->acct_sock;
conf->acct_server->requests++;
} else {
if (conf->auth_server == NULL) {
hostapd_logger(radius->ctx, NULL,
HOSTAPD_MODULE_RADIUS,
HOSTAPD_LEVEL_INFO,
"No authentication server configured");
return -1;
}
shared_secret = conf->auth_server->shared_secret;
shared_secret_len = conf->auth_server->shared_secret_len;
radius_msg_finish(msg, shared_secret, shared_secret_len);
name = "authentication";
s = radius->auth_sock;
conf->auth_server->requests++;
}
hostapd_logger(radius->ctx, NULL, HOSTAPD_MODULE_RADIUS,
HOSTAPD_LEVEL_DEBUG, "Sending RADIUS message to %s "
"server", name);
if (conf->msg_dumps)
radius_msg_dump(msg);
buf = radius_msg_get_buf(msg);
res = send(s, wpabuf_head(buf), wpabuf_len(buf), 0);
if (res < 0)
radius_client_handle_send_error(radius, s, msg_type);
radius_client_list_add(radius, msg, msg_type, shared_secret,
shared_secret_len, addr);
return res;
}
static void radius_client_receive(int sock, void *eloop_ctx, void *sock_ctx)
{
struct radius_client_data *radius = eloop_ctx;
struct hostapd_radius_servers *conf = radius->conf;
RadiusType msg_type = (RadiusType) sock_ctx;
int len, roundtrip;
unsigned char buf[3000];
struct radius_msg *msg;
struct radius_hdr *hdr;
struct radius_rx_handler *handlers;
size_t num_handlers, i;
struct radius_msg_list *req, *prev_req;
struct os_time now;
struct hostapd_radius_server *rconf;
int invalid_authenticator = 0;
if (msg_type == RADIUS_ACCT) {
handlers = radius->acct_handlers;
num_handlers = radius->num_acct_handlers;
rconf = conf->acct_server;
} else {
handlers = radius->auth_handlers;
num_handlers = radius->num_auth_handlers;
rconf = conf->auth_server;
}
len = recv(sock, buf, sizeof(buf), MSG_DONTWAIT);
if (len < 0) {
perror("recv[RADIUS]");
return;
}
hostapd_logger(radius->ctx, NULL, HOSTAPD_MODULE_RADIUS,
HOSTAPD_LEVEL_DEBUG, "Received %d bytes from RADIUS "
"server", len);
if (len == sizeof(buf)) {
printf("Possibly too long UDP frame for our buffer - "
"dropping it\n");
return;
}
msg = radius_msg_parse(buf, len);
if (msg == NULL) {
printf("Parsing incoming RADIUS frame failed\n");
rconf->malformed_responses++;
return;
}
hdr = radius_msg_get_hdr(msg);
hostapd_logger(radius->ctx, NULL, HOSTAPD_MODULE_RADIUS,
HOSTAPD_LEVEL_DEBUG, "Received RADIUS message");
if (conf->msg_dumps)
radius_msg_dump(msg);
switch (hdr->code) {
case RADIUS_CODE_ACCESS_ACCEPT:
rconf->access_accepts++;
break;
case RADIUS_CODE_ACCESS_REJECT:
rconf->access_rejects++;
break;
case RADIUS_CODE_ACCESS_CHALLENGE:
rconf->access_challenges++;
break;
case RADIUS_CODE_ACCOUNTING_RESPONSE:
rconf->responses++;
break;
}
prev_req = NULL;
req = radius->msgs;
while (req) {
/* TODO: also match by src addr:port of the packet when using
* alternative RADIUS servers (?) */
if ((req->msg_type == msg_type ||
(req->msg_type == RADIUS_ACCT_INTERIM &&
msg_type == RADIUS_ACCT)) &&
radius_msg_get_hdr(req->msg)->identifier ==
hdr->identifier)
break;
prev_req = req;
req = req->next;
}
if (req == NULL) {
hostapd_logger(radius->ctx, NULL, HOSTAPD_MODULE_RADIUS,
HOSTAPD_LEVEL_DEBUG,
"No matching RADIUS request found (type=%d "
"id=%d) - dropping packet",
msg_type, hdr->identifier);
goto fail;
}
os_get_time(&now);
roundtrip = (now.sec - req->last_attempt.sec) * 100 +
(now.usec - req->last_attempt.usec) / 10000;
hostapd_logger(radius->ctx, req->addr, HOSTAPD_MODULE_RADIUS,
HOSTAPD_LEVEL_DEBUG,
"Received RADIUS packet matched with a pending "
"request, round trip time %d.%02d sec",
roundtrip / 100, roundtrip % 100);
rconf->round_trip_time = roundtrip;
/* Remove ACKed RADIUS packet from retransmit list */
if (prev_req)
prev_req->next = req->next;
else
radius->msgs = req->next;
radius->num_msgs--;
for (i = 0; i < num_handlers; i++) {
RadiusRxResult res;
res = handlers[i].handler(msg, req->msg, req->shared_secret,
req->shared_secret_len,
handlers[i].data);
switch (res) {
case RADIUS_RX_PROCESSED:
radius_msg_free(msg);
/* continue */
case RADIUS_RX_QUEUED:
radius_client_msg_free(req);
return;
case RADIUS_RX_INVALID_AUTHENTICATOR:
invalid_authenticator++;
/* continue */
case RADIUS_RX_UNKNOWN:
/* continue with next handler */
break;
}
}
if (invalid_authenticator)
rconf->bad_authenticators++;
else
rconf->unknown_types++;
hostapd_logger(radius->ctx, req->addr, HOSTAPD_MODULE_RADIUS,
HOSTAPD_LEVEL_DEBUG, "No RADIUS RX handler found "
"(type=%d code=%d id=%d)%s - dropping packet",
msg_type, hdr->code, hdr->identifier,
invalid_authenticator ? " [INVALID AUTHENTICATOR]" :
"");
radius_client_msg_free(req);
fail:
radius_msg_free(msg);
}
/**
* radius_client_get_id - Get an identifier for a new RADIUS message
* @radius: RADIUS client context from radius_client_init()
* Returns: Allocated identifier
*
* This function is used to fetch a unique (among pending requests) identifier
* for a new RADIUS message.
*/
u8 radius_client_get_id(struct radius_client_data *radius)
{
struct radius_msg_list *entry, *prev, *_remove;
u8 id = radius->next_radius_identifier++;
/* remove entries with matching id from retransmit list to avoid
* using new reply from the RADIUS server with an old request */
entry = radius->msgs;
prev = NULL;
while (entry) {
if (radius_msg_get_hdr(entry->msg)->identifier == id) {
hostapd_logger(radius->ctx, entry->addr,
HOSTAPD_MODULE_RADIUS,
HOSTAPD_LEVEL_DEBUG,
"Removing pending RADIUS message, "
"since its id (%d) is reused", id);
if (prev)
prev->next = entry->next;
else
radius->msgs = entry->next;
_remove = entry;
} else {
_remove = NULL;
prev = entry;
}
entry = entry->next;
if (_remove)
radius_client_msg_free(_remove);
}
return id;
}
/**
* radius_client_flush - Flush all pending RADIUS client messages
* @radius: RADIUS client context from radius_client_init()
* @only_auth: Whether only authentication messages are removed
*/
void radius_client_flush(struct radius_client_data *radius, int only_auth)
{
struct radius_msg_list *entry, *prev, *tmp;
if (!radius)
return;
prev = NULL;
entry = radius->msgs;
while (entry) {
if (!only_auth || entry->msg_type == RADIUS_AUTH) {
if (prev)
prev->next = entry->next;
else
radius->msgs = entry->next;
tmp = entry;
entry = entry->next;
radius_client_msg_free(tmp);
radius->num_msgs--;
} else {
prev = entry;
entry = entry->next;
}
}
if (radius->msgs == NULL)
eloop_cancel_timeout(radius_client_timer, radius, NULL);
}
static void radius_client_update_acct_msgs(struct radius_client_data *radius,
const u8 *shared_secret,
size_t shared_secret_len)
{
struct radius_msg_list *entry;
if (!radius)
return;
for (entry = radius->msgs; entry; entry = entry->next) {
if (entry->msg_type == RADIUS_ACCT) {
entry->shared_secret = shared_secret;
entry->shared_secret_len = shared_secret_len;
radius_msg_finish_acct(entry->msg, shared_secret,
shared_secret_len);
}
}
}
static int
radius_change_server(struct radius_client_data *radius,
struct hostapd_radius_server *nserv,
struct hostapd_radius_server *oserv,
int sock, int sock6, int auth)
{
struct sockaddr_in serv, claddr;
#ifdef CONFIG_IPV6
struct sockaddr_in6 serv6, claddr6;
#endif /* CONFIG_IPV6 */
struct sockaddr *addr, *cl_addr;
socklen_t addrlen, claddrlen;
char abuf[50];
int sel_sock;
struct radius_msg_list *entry;
struct hostapd_radius_servers *conf = radius->conf;
hostapd_logger(radius->ctx, NULL, HOSTAPD_MODULE_RADIUS,
HOSTAPD_LEVEL_INFO,
"%s server %s:%d",
auth ? "Authentication" : "Accounting",
hostapd_ip_txt(&nserv->addr, abuf, sizeof(abuf)),
nserv->port);
if (!oserv || nserv->shared_secret_len != oserv->shared_secret_len ||
os_memcmp(nserv->shared_secret, oserv->shared_secret,
nserv->shared_secret_len) != 0) {
/* Pending RADIUS packets used different shared secret, so
* they need to be modified. Update accounting message
* authenticators here. Authentication messages are removed
* since they would require more changes and the new RADIUS
* server may not be prepared to receive them anyway due to
* missing state information. Client will likely retry
* authentication, so this should not be an issue. */
if (auth)
radius_client_flush(radius, 1);
else {
radius_client_update_acct_msgs(
radius, nserv->shared_secret,
nserv->shared_secret_len);
}
}
/* Reset retry counters for the new server */
for (entry = radius->msgs; entry; entry = entry->next) {
if ((auth && entry->msg_type != RADIUS_AUTH) ||
(!auth && entry->msg_type != RADIUS_ACCT))
continue;
entry->next_try = entry->first_try + RADIUS_CLIENT_FIRST_WAIT;
entry->attempts = 0;
entry->next_wait = RADIUS_CLIENT_FIRST_WAIT * 2;
}
if (radius->msgs) {
eloop_cancel_timeout(radius_client_timer, radius, NULL);
eloop_register_timeout(RADIUS_CLIENT_FIRST_WAIT, 0,
radius_client_timer, radius, NULL);
}
switch (nserv->addr.af) {
case AF_INET:
os_memset(&serv, 0, sizeof(serv));
serv.sin_family = AF_INET;
serv.sin_addr.s_addr = nserv->addr.u.v4.s_addr;
serv.sin_port = htons(nserv->port);
addr = (struct sockaddr *) &serv;
addrlen = sizeof(serv);
sel_sock = sock;
break;
#ifdef CONFIG_IPV6
case AF_INET6:
os_memset(&serv6, 0, sizeof(serv6));
serv6.sin6_family = AF_INET6;
os_memcpy(&serv6.sin6_addr, &nserv->addr.u.v6,
sizeof(struct in6_addr));
serv6.sin6_port = htons(nserv->port);
addr = (struct sockaddr *) &serv6;
addrlen = sizeof(serv6);
sel_sock = sock6;
break;
#endif /* CONFIG_IPV6 */
default:
return -1;
}
if (conf->force_client_addr) {
switch (conf->client_addr.af) {
case AF_INET:
os_memset(&claddr, 0, sizeof(claddr));
claddr.sin_family = AF_INET;
claddr.sin_addr.s_addr = conf->client_addr.u.v4.s_addr;
claddr.sin_port = htons(0);
cl_addr = (struct sockaddr *) &claddr;
claddrlen = sizeof(claddr);
break;
#ifdef CONFIG_IPV6
case AF_INET6:
os_memset(&claddr6, 0, sizeof(claddr6));
claddr6.sin6_family = AF_INET6;
os_memcpy(&claddr6.sin6_addr, &conf->client_addr.u.v6,
sizeof(struct in6_addr));
claddr6.sin6_port = htons(0);
cl_addr = (struct sockaddr *) &claddr6;
claddrlen = sizeof(claddr6);
break;
#endif /* CONFIG_IPV6 */
default:
return -1;
}
if (bind(sel_sock, cl_addr, claddrlen) < 0) {
perror("bind[radius]");
return -1;
}
}
if (connect(sel_sock, addr, addrlen) < 0) {
perror("connect[radius]");
return -1;
}
#ifndef CONFIG_NATIVE_WINDOWS
switch (nserv->addr.af) {
case AF_INET:
claddrlen = sizeof(claddr);
getsockname(sel_sock, (struct sockaddr *) &claddr, &claddrlen);
wpa_printf(MSG_DEBUG, "RADIUS local address: %s:%u",
inet_ntoa(claddr.sin_addr), ntohs(claddr.sin_port));
break;
#ifdef CONFIG_IPV6
case AF_INET6: {
claddrlen = sizeof(claddr6);
getsockname(sel_sock, (struct sockaddr *) &claddr6,
&claddrlen);
wpa_printf(MSG_DEBUG, "RADIUS local address: %s:%u",
inet_ntop(AF_INET6, &claddr6.sin6_addr,
abuf, sizeof(abuf)),
ntohs(claddr6.sin6_port));
break;
}
#endif /* CONFIG_IPV6 */
}
#endif /* CONFIG_NATIVE_WINDOWS */
if (auth)
radius->auth_sock = sel_sock;
else
radius->acct_sock = sel_sock;
return 0;
}
static void radius_retry_primary_timer(void *eloop_ctx, void *timeout_ctx)
{
struct radius_client_data *radius = eloop_ctx;
struct hostapd_radius_servers *conf = radius->conf;
struct hostapd_radius_server *oserv;
if (radius->auth_sock >= 0 && conf->auth_servers &&
conf->auth_server != conf->auth_servers) {
oserv = conf->auth_server;
conf->auth_server = conf->auth_servers;
radius_change_server(radius, conf->auth_server, oserv,
radius->auth_serv_sock,
radius->auth_serv_sock6, 1);
}
if (radius->acct_sock >= 0 && conf->acct_servers &&
conf->acct_server != conf->acct_servers) {
oserv = conf->acct_server;
conf->acct_server = conf->acct_servers;
radius_change_server(radius, conf->acct_server, oserv,
radius->acct_serv_sock,
radius->acct_serv_sock6, 0);
}
if (conf->retry_primary_interval)
eloop_register_timeout(conf->retry_primary_interval, 0,
radius_retry_primary_timer, radius,
NULL);
}
static int radius_client_disable_pmtu_discovery(int s)
{
int r = -1;
#if defined(IP_MTU_DISCOVER) && defined(IP_PMTUDISC_DONT)
/* Turn off Path MTU discovery on IPv4/UDP sockets. */
int action = IP_PMTUDISC_DONT;
r = setsockopt(s, IPPROTO_IP, IP_MTU_DISCOVER, &action,
sizeof(action));
if (r == -1)
wpa_printf(MSG_ERROR, "Failed to set IP_MTU_DISCOVER: "
"%s", strerror(errno));
#endif
return r;
}
static int radius_client_init_auth(struct radius_client_data *radius)
{
struct hostapd_radius_servers *conf = radius->conf;
int ok = 0;
radius->auth_serv_sock = socket(PF_INET, SOCK_DGRAM, 0);
if (radius->auth_serv_sock < 0)
perror("socket[PF_INET,SOCK_DGRAM]");
else {
radius_client_disable_pmtu_discovery(radius->auth_serv_sock);
ok++;
}
#ifdef CONFIG_IPV6
radius->auth_serv_sock6 = socket(PF_INET6, SOCK_DGRAM, 0);
if (radius->auth_serv_sock6 < 0)
perror("socket[PF_INET6,SOCK_DGRAM]");
else
ok++;
#endif /* CONFIG_IPV6 */
if (ok == 0)
return -1;
radius_change_server(radius, conf->auth_server, NULL,
radius->auth_serv_sock, radius->auth_serv_sock6,
1);
if (radius->auth_serv_sock >= 0 &&
eloop_register_read_sock(radius->auth_serv_sock,
radius_client_receive, radius,
(void *) RADIUS_AUTH)) {
printf("Could not register read socket for authentication "
"server\n");
return -1;
}
#ifdef CONFIG_IPV6
if (radius->auth_serv_sock6 >= 0 &&
eloop_register_read_sock(radius->auth_serv_sock6,
radius_client_receive, radius,
(void *) RADIUS_AUTH)) {
printf("Could not register read socket for authentication "
"server\n");
return -1;
}
#endif /* CONFIG_IPV6 */
return 0;
}
static int radius_client_init_acct(struct radius_client_data *radius)
{
struct hostapd_radius_servers *conf = radius->conf;
int ok = 0;
radius->acct_serv_sock = socket(PF_INET, SOCK_DGRAM, 0);
if (radius->acct_serv_sock < 0)
perror("socket[PF_INET,SOCK_DGRAM]");
else {
radius_client_disable_pmtu_discovery(radius->acct_serv_sock);
ok++;
}
#ifdef CONFIG_IPV6
radius->acct_serv_sock6 = socket(PF_INET6, SOCK_DGRAM, 0);
if (radius->acct_serv_sock6 < 0)
perror("socket[PF_INET6,SOCK_DGRAM]");
else
ok++;
#endif /* CONFIG_IPV6 */
if (ok == 0)
return -1;
radius_change_server(radius, conf->acct_server, NULL,
radius->acct_serv_sock, radius->acct_serv_sock6,
0);
if (radius->acct_serv_sock >= 0 &&
eloop_register_read_sock(radius->acct_serv_sock,
radius_client_receive, radius,
(void *) RADIUS_ACCT)) {
printf("Could not register read socket for accounting "
"server\n");
return -1;
}
#ifdef CONFIG_IPV6
if (radius->acct_serv_sock6 >= 0 &&
eloop_register_read_sock(radius->acct_serv_sock6,
radius_client_receive, radius,
(void *) RADIUS_ACCT)) {
printf("Could not register read socket for accounting "
"server\n");
return -1;
}
#endif /* CONFIG_IPV6 */
return 0;
}
/**
* radius_client_init - Initialize RADIUS client
* @ctx: Callback context to be used in hostapd_logger() calls
* @conf: RADIUS client configuration (RADIUS servers)
* Returns: Pointer to private RADIUS client context or %NULL on failure
*
* The caller is responsible for keeping the configuration data available for
* the lifetime of the RADIUS client, i.e., until radius_client_deinit() is
* called for the returned context pointer.
*/
struct radius_client_data *
radius_client_init(void *ctx, struct hostapd_radius_servers *conf)
{
struct radius_client_data *radius;
radius = os_zalloc(sizeof(struct radius_client_data));
if (radius == NULL)
return NULL;
radius->ctx = ctx;
radius->conf = conf;
radius->auth_serv_sock = radius->acct_serv_sock =
radius->auth_serv_sock6 = radius->acct_serv_sock6 =
radius->auth_sock = radius->acct_sock = -1;
if (conf->auth_server && radius_client_init_auth(radius)) {
radius_client_deinit(radius);
return NULL;
}
if (conf->acct_server && radius_client_init_acct(radius)) {
radius_client_deinit(radius);
return NULL;
}
if (conf->retry_primary_interval)
eloop_register_timeout(conf->retry_primary_interval, 0,
radius_retry_primary_timer, radius,
NULL);
return radius;
}
/**
* radius_client_deinit - Deinitialize RADIUS client
* @radius: RADIUS client context from radius_client_init()
*/
void radius_client_deinit(struct radius_client_data *radius)
{
if (!radius)
return;
if (radius->auth_serv_sock >= 0)
eloop_unregister_read_sock(radius->auth_serv_sock);
if (radius->acct_serv_sock >= 0)
eloop_unregister_read_sock(radius->acct_serv_sock);
#ifdef CONFIG_IPV6
if (radius->auth_serv_sock6 >= 0)
eloop_unregister_read_sock(radius->auth_serv_sock6);
if (radius->acct_serv_sock6 >= 0)
eloop_unregister_read_sock(radius->acct_serv_sock6);
#endif /* CONFIG_IPV6 */
eloop_cancel_timeout(radius_retry_primary_timer, radius, NULL);
radius_client_flush(radius, 0);
os_free(radius->auth_handlers);
os_free(radius->acct_handlers);
os_free(radius);
}
/**
* radius_client_flush_auth - Flush pending RADIUS messages for an address
* @radius: RADIUS client context from radius_client_init()
* @addr: MAC address of the related device
*
* This function can be used to remove pending RADIUS authentication messages
* that are related to a specific device. The addr parameter is matched with
* the one used in radius_client_send() call that was used to transmit the
* authentication request.
*/
void radius_client_flush_auth(struct radius_client_data *radius,
const u8 *addr)
{
struct radius_msg_list *entry, *prev, *tmp;
prev = NULL;
entry = radius->msgs;
while (entry) {
if (entry->msg_type == RADIUS_AUTH &&
os_memcmp(entry->addr, addr, ETH_ALEN) == 0) {
hostapd_logger(radius->ctx, addr,
HOSTAPD_MODULE_RADIUS,
HOSTAPD_LEVEL_DEBUG,
"Removing pending RADIUS authentication"
" message for removed client");
if (prev)
prev->next = entry->next;
else
radius->msgs = entry->next;
tmp = entry;
entry = entry->next;
radius_client_msg_free(tmp);
radius->num_msgs--;
continue;
}
prev = entry;
entry = entry->next;
}
}
static int radius_client_dump_auth_server(char *buf, size_t buflen,
struct hostapd_radius_server *serv,
struct radius_client_data *cli)
{
int pending = 0;
struct radius_msg_list *msg;
char abuf[50];
if (cli) {
for (msg = cli->msgs; msg; msg = msg->next) {
if (msg->msg_type == RADIUS_AUTH)
pending++;
}
}
return os_snprintf(buf, buflen,
"radiusAuthServerIndex=%d\n"
"radiusAuthServerAddress=%s\n"
"radiusAuthClientServerPortNumber=%d\n"
"radiusAuthClientRoundTripTime=%d\n"
"radiusAuthClientAccessRequests=%u\n"
"radiusAuthClientAccessRetransmissions=%u\n"
"radiusAuthClientAccessAccepts=%u\n"
"radiusAuthClientAccessRejects=%u\n"
"radiusAuthClientAccessChallenges=%u\n"
"radiusAuthClientMalformedAccessResponses=%u\n"
"radiusAuthClientBadAuthenticators=%u\n"
"radiusAuthClientPendingRequests=%u\n"
"radiusAuthClientTimeouts=%u\n"
"radiusAuthClientUnknownTypes=%u\n"
"radiusAuthClientPacketsDropped=%u\n",
serv->index,
hostapd_ip_txt(&serv->addr, abuf, sizeof(abuf)),
serv->port,
serv->round_trip_time,
serv->requests,
serv->retransmissions,
serv->access_accepts,
serv->access_rejects,
serv->access_challenges,
serv->malformed_responses,
serv->bad_authenticators,
pending,
serv->timeouts,
serv->unknown_types,
serv->packets_dropped);
}
static int radius_client_dump_acct_server(char *buf, size_t buflen,
struct hostapd_radius_server *serv,
struct radius_client_data *cli)
{
int pending = 0;
struct radius_msg_list *msg;
char abuf[50];
if (cli) {
for (msg = cli->msgs; msg; msg = msg->next) {
if (msg->msg_type == RADIUS_ACCT ||
msg->msg_type == RADIUS_ACCT_INTERIM)
pending++;
}
}
return os_snprintf(buf, buflen,
"radiusAccServerIndex=%d\n"
"radiusAccServerAddress=%s\n"
"radiusAccClientServerPortNumber=%d\n"
"radiusAccClientRoundTripTime=%d\n"
"radiusAccClientRequests=%u\n"
"radiusAccClientRetransmissions=%u\n"
"radiusAccClientResponses=%u\n"
"radiusAccClientMalformedResponses=%u\n"
"radiusAccClientBadAuthenticators=%u\n"
"radiusAccClientPendingRequests=%u\n"
"radiusAccClientTimeouts=%u\n"
"radiusAccClientUnknownTypes=%u\n"
"radiusAccClientPacketsDropped=%u\n",
serv->index,
hostapd_ip_txt(&serv->addr, abuf, sizeof(abuf)),
serv->port,
serv->round_trip_time,
serv->requests,
serv->retransmissions,
serv->responses,
serv->malformed_responses,
serv->bad_authenticators,
pending,
serv->timeouts,
serv->unknown_types,
serv->packets_dropped);
}
/**
* radius_client_get_mib - Get RADIUS client MIB information
* @radius: RADIUS client context from radius_client_init()
* @buf: Buffer for returning MIB data in text format
* @buflen: Maximum buf length in octets
* Returns: Number of octets written into the buffer
*/
int radius_client_get_mib(struct radius_client_data *radius, char *buf,
size_t buflen)
{
struct hostapd_radius_servers *conf = radius->conf;
int i;
struct hostapd_radius_server *serv;
int count = 0;
if (conf->auth_servers) {
for (i = 0; i < conf->num_auth_servers; i++) {
serv = &conf->auth_servers[i];
count += radius_client_dump_auth_server(
buf + count, buflen - count, serv,
serv == conf->auth_server ?
radius : NULL);
}
}
if (conf->acct_servers) {
for (i = 0; i < conf->num_acct_servers; i++) {
serv = &conf->acct_servers[i];
count += radius_client_dump_acct_server(
buf + count, buflen - count, serv,
serv == conf->acct_server ?
radius : NULL);
}
}
return count;
}
void radius_client_reconfig(struct radius_client_data *radius,
struct hostapd_radius_servers *conf)
{
if (radius)
radius->conf = conf;
}