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fragattacks/src/radius/radius_server.c
Dan Harkins df684d82ff EAP-pwd: Add support for EAP-pwd server and peer functionality 
This adds an initial EAP-pwd (RFC 5931) implementation. For now,
this requires OpenSSL.
2010-09-14 21:51:40 -10:00

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/*
* RADIUS authentication server
* Copyright (c) 2005-2009, Jouni Malinen <j@w1.fi>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* Alternatively, this software may be distributed under the terms of BSD
* license.
*
* See README and COPYING for more details.
*/
#include "includes.h"
#include <net/if.h>
#include "common.h"
#include "radius.h"
#include "eloop.h"
#include "eap_server/eap.h"
#include "radius_server.h"
/**
* RADIUS_SESSION_TIMEOUT - Session timeout in seconds
*/
#define RADIUS_SESSION_TIMEOUT 60
/**
* RADIUS_MAX_SESSION - Maximum number of active sessions
*/
#define RADIUS_MAX_SESSION 100
/**
* RADIUS_MAX_MSG_LEN - Maximum message length for incoming RADIUS messages
*/
#define RADIUS_MAX_MSG_LEN 3000
static struct eapol_callbacks radius_server_eapol_cb;
struct radius_client;
struct radius_server_data;
/**
* struct radius_server_counters - RADIUS server statistics counters
*/
struct radius_server_counters {
u32 access_requests;
u32 invalid_requests;
u32 dup_access_requests;
u32 access_accepts;
u32 access_rejects;
u32 access_challenges;
u32 malformed_access_requests;
u32 bad_authenticators;
u32 packets_dropped;
u32 unknown_types;
};
/**
* struct radius_session - Internal RADIUS server data for a session
*/
struct radius_session {
struct radius_session *next;
struct radius_client *client;
struct radius_server_data *server;
unsigned int sess_id;
struct eap_sm *eap;
struct eap_eapol_interface *eap_if;
struct radius_msg *last_msg;
char *last_from_addr;
int last_from_port;
struct sockaddr_storage last_from;
socklen_t last_fromlen;
u8 last_identifier;
struct radius_msg *last_reply;
u8 last_authenticator[16];
};
/**
* struct radius_client - Internal RADIUS server data for a client
*/
struct radius_client {
struct radius_client *next;
struct in_addr addr;
struct in_addr mask;
#ifdef CONFIG_IPV6
struct in6_addr addr6;
struct in6_addr mask6;
#endif /* CONFIG_IPV6 */
char *shared_secret;
int shared_secret_len;
struct radius_session *sessions;
struct radius_server_counters counters;
};
/**
* struct radius_server_data - Internal RADIUS server data
*/
struct radius_server_data {
/**
* auth_sock - Socket for RADIUS authentication messages
*/
int auth_sock;
/**
* clients - List of authorized RADIUS clients
*/
struct radius_client *clients;
/**
* next_sess_id - Next session identifier
*/
unsigned int next_sess_id;
/**
* conf_ctx - Context pointer for callbacks
*
* This is used as the ctx argument in get_eap_user() calls.
*/
void *conf_ctx;
/**
* num_sess - Number of active sessions
*/
int num_sess;
/**
* eap_sim_db_priv - EAP-SIM/AKA database context
*
* This is passed to the EAP-SIM/AKA server implementation as a
* callback context.
*/
void *eap_sim_db_priv;
/**
* ssl_ctx - TLS context
*
* This is passed to the EAP server implementation as a callback
* context for TLS operations.
*/
void *ssl_ctx;
/**
* pac_opaque_encr_key - PAC-Opaque encryption key for EAP-FAST
*
* This parameter is used to set a key for EAP-FAST to encrypt the
* PAC-Opaque data. It can be set to %NULL if EAP-FAST is not used. If
* set, must point to a 16-octet key.
*/
u8 *pac_opaque_encr_key;
/**
* eap_fast_a_id - EAP-FAST authority identity (A-ID)
*
* If EAP-FAST is not used, this can be set to %NULL. In theory, this
* is a variable length field, but due to some existing implementations
* requiring A-ID to be 16 octets in length, it is recommended to use
* that length for the field to provide interoperability with deployed
* peer implementations.
*/
u8 *eap_fast_a_id;
/**
* eap_fast_a_id_len - Length of eap_fast_a_id buffer in octets
*/
size_t eap_fast_a_id_len;
/**
* eap_fast_a_id_info - EAP-FAST authority identifier information
*
* This A-ID-Info contains a user-friendly name for the A-ID. For
* example, this could be the enterprise and server names in
* human-readable format. This field is encoded as UTF-8. If EAP-FAST
* is not used, this can be set to %NULL.
*/
char *eap_fast_a_id_info;
/**
* eap_fast_prov - EAP-FAST provisioning modes
*
* 0 = provisioning disabled, 1 = only anonymous provisioning allowed,
* 2 = only authenticated provisioning allowed, 3 = both provisioning
* modes allowed.
*/
int eap_fast_prov;
/**
* pac_key_lifetime - EAP-FAST PAC-Key lifetime in seconds
*
* This is the hard limit on how long a provisioned PAC-Key can be
* used.
*/
int pac_key_lifetime;
/**
* pac_key_refresh_time - EAP-FAST PAC-Key refresh time in seconds
*
* This is a soft limit on the PAC-Key. The server will automatically
* generate a new PAC-Key when this number of seconds (or fewer) of the
* lifetime remains.
*/
int pac_key_refresh_time;
/**
* eap_sim_aka_result_ind - EAP-SIM/AKA protected success indication
*
* This controls whether the protected success/failure indication
* (AT_RESULT_IND) is used with EAP-SIM and EAP-AKA.
*/
int eap_sim_aka_result_ind;
/**
* tnc - Trusted Network Connect (TNC)
*
* This controls whether TNC is enabled and will be required before the
* peer is allowed to connect. Note: This is only used with EAP-TTLS
* and EAP-FAST. If any other EAP method is enabled, the peer will be
* allowed to connect without TNC.
*/
int tnc;
/**
* pwd_group - The D-H group assigned for EAP-pwd
*
* If EAP-pwd is not used it can be set to zero.
*/
u16 pwd_group;
/**
* wps - Wi-Fi Protected Setup context
*
* If WPS is used with an external RADIUS server (which is quite
* unlikely configuration), this is used to provide a pointer to WPS
* context data. Normally, this can be set to %NULL.
*/
struct wps_context *wps;
/**
* ipv6 - Whether to enable IPv6 support in the RADIUS server
*/
int ipv6;
/**
* start_time - Timestamp of server start
*/
struct os_time start_time;
/**
* counters - Statistics counters for server operations
*
* These counters are the sum over all clients.
*/
struct radius_server_counters counters;
/**
* get_eap_user - Callback for fetching EAP user information
* @ctx: Context data from conf_ctx
* @identity: User identity
* @identity_len: identity buffer length in octets
* @phase2: Whether this is for Phase 2 identity
* @user: Data structure for filling in the user information
* Returns: 0 on success, -1 on failure
*
* This is used to fetch information from user database. The callback
* will fill in information about allowed EAP methods and the user
* password. The password field will be an allocated copy of the
* password data and RADIUS server will free it after use.
*/
int (*get_eap_user)(void *ctx, const u8 *identity, size_t identity_len,
int phase2, struct eap_user *user);
/**
* eap_req_id_text - Optional data for EAP-Request/Identity
*
* This can be used to configure an optional, displayable message that
* will be sent in EAP-Request/Identity. This string can contain an
* ASCII-0 character (nul) to separate network infromation per RFC
* 4284. The actual string length is explicit provided in
* eap_req_id_text_len since nul character will not be used as a string
* terminator.
*/
char *eap_req_id_text;
/**
* eap_req_id_text_len - Length of eap_req_id_text buffer in octets
*/
size_t eap_req_id_text_len;
/*
* msg_ctx - Context data for wpa_msg() calls
*/
void *msg_ctx;
};
extern int wpa_debug_level;
#define RADIUS_DEBUG(args...) \
wpa_printf(MSG_DEBUG, "RADIUS SRV: " args)
#define RADIUS_ERROR(args...) \
wpa_printf(MSG_ERROR, "RADIUS SRV: " args)
#define RADIUS_DUMP(args...) \
wpa_hexdump(MSG_MSGDUMP, "RADIUS SRV: " args)
#define RADIUS_DUMP_ASCII(args...) \
wpa_hexdump_ascii(MSG_MSGDUMP, "RADIUS SRV: " args)
static void radius_server_session_timeout(void *eloop_ctx, void *timeout_ctx);
static void radius_server_session_remove_timeout(void *eloop_ctx,
void *timeout_ctx);
static struct radius_client *
radius_server_get_client(struct radius_server_data *data, struct in_addr *addr,
int ipv6)
{
struct radius_client *client = data->clients;
while (client) {
#ifdef CONFIG_IPV6
if (ipv6) {
struct in6_addr *addr6;
int i;
addr6 = (struct in6_addr *) addr;
for (i = 0; i < 16; i++) {
if ((addr6->s6_addr[i] &
client->mask6.s6_addr[i]) !=
(client->addr6.s6_addr[i] &
client->mask6.s6_addr[i])) {
i = 17;
break;
}
}
if (i == 16) {
break;
}
}
#endif /* CONFIG_IPV6 */
if (!ipv6 && (client->addr.s_addr & client->mask.s_addr) ==
(addr->s_addr & client->mask.s_addr)) {
break;
}
client = client->next;
}
return client;
}
static struct radius_session *
radius_server_get_session(struct radius_client *client, unsigned int sess_id)
{
struct radius_session *sess = client->sessions;
while (sess) {
if (sess->sess_id == sess_id) {
break;
}
sess = sess->next;
}
return sess;
}
static void radius_server_session_free(struct radius_server_data *data,
struct radius_session *sess)
{
eloop_cancel_timeout(radius_server_session_timeout, data, sess);
eloop_cancel_timeout(radius_server_session_remove_timeout, data, sess);
eap_server_sm_deinit(sess->eap);
radius_msg_free(sess->last_msg);
os_free(sess->last_from_addr);
radius_msg_free(sess->last_reply);
os_free(sess);
data->num_sess--;
}
static void radius_server_session_remove(struct radius_server_data *data,
struct radius_session *sess)
{
struct radius_client *client = sess->client;
struct radius_session *session, *prev;
eloop_cancel_timeout(radius_server_session_remove_timeout, data, sess);
prev = NULL;
session = client->sessions;
while (session) {
if (session == sess) {
if (prev == NULL) {
client->sessions = sess->next;
} else {
prev->next = sess->next;
}
radius_server_session_free(data, sess);
break;
}
prev = session;
session = session->next;
}
}
static void radius_server_session_remove_timeout(void *eloop_ctx,
void *timeout_ctx)
{
struct radius_server_data *data = eloop_ctx;
struct radius_session *sess = timeout_ctx;
RADIUS_DEBUG("Removing completed session 0x%x", sess->sess_id);
radius_server_session_remove(data, sess);
}
static void radius_server_session_timeout(void *eloop_ctx, void *timeout_ctx)
{
struct radius_server_data *data = eloop_ctx;
struct radius_session *sess = timeout_ctx;
RADIUS_DEBUG("Timing out authentication session 0x%x", sess->sess_id);
radius_server_session_remove(data, sess);
}
static struct radius_session *
radius_server_new_session(struct radius_server_data *data,
struct radius_client *client)
{
struct radius_session *sess;
if (data->num_sess >= RADIUS_MAX_SESSION) {
RADIUS_DEBUG("Maximum number of existing session - no room "
"for a new session");
return NULL;
}
sess = os_zalloc(sizeof(*sess));
if (sess == NULL)
return NULL;
sess->server = data;
sess->client = client;
sess->sess_id = data->next_sess_id++;
sess->next = client->sessions;
client->sessions = sess;
eloop_register_timeout(RADIUS_SESSION_TIMEOUT, 0,
radius_server_session_timeout, data, sess);
data->num_sess++;
return sess;
}
static struct radius_session *
radius_server_get_new_session(struct radius_server_data *data,
struct radius_client *client,
struct radius_msg *msg)
{
u8 *user;
size_t user_len;
int res;
struct radius_session *sess;
struct eap_config eap_conf;
RADIUS_DEBUG("Creating a new session");
user = os_malloc(256);
if (user == NULL) {
return NULL;
}
res = radius_msg_get_attr(msg, RADIUS_ATTR_USER_NAME, user, 256);
if (res < 0 || res > 256) {
RADIUS_DEBUG("Could not get User-Name");
os_free(user);
return NULL;
}
user_len = res;
RADIUS_DUMP_ASCII("User-Name", user, user_len);
res = data->get_eap_user(data->conf_ctx, user, user_len, 0, NULL);
os_free(user);
if (res == 0) {
RADIUS_DEBUG("Matching user entry found");
sess = radius_server_new_session(data, client);
if (sess == NULL) {
RADIUS_DEBUG("Failed to create a new session");
return NULL;
}
} else {
RADIUS_DEBUG("User-Name not found from user database");
return NULL;
}
os_memset(&eap_conf, 0, sizeof(eap_conf));
eap_conf.ssl_ctx = data->ssl_ctx;
eap_conf.msg_ctx = data->msg_ctx;
eap_conf.eap_sim_db_priv = data->eap_sim_db_priv;
eap_conf.backend_auth = TRUE;
eap_conf.eap_server = 1;
eap_conf.pac_opaque_encr_key = data->pac_opaque_encr_key;
eap_conf.eap_fast_a_id = data->eap_fast_a_id;
eap_conf.eap_fast_a_id_len = data->eap_fast_a_id_len;
eap_conf.eap_fast_a_id_info = data->eap_fast_a_id_info;
eap_conf.eap_fast_prov = data->eap_fast_prov;
eap_conf.pac_key_lifetime = data->pac_key_lifetime;
eap_conf.pac_key_refresh_time = data->pac_key_refresh_time;
eap_conf.eap_sim_aka_result_ind = data->eap_sim_aka_result_ind;
eap_conf.tnc = data->tnc;
eap_conf.wps = data->wps;
eap_conf.pwd_group = data->pwd_group;
sess->eap = eap_server_sm_init(sess, &radius_server_eapol_cb,
&eap_conf);
if (sess->eap == NULL) {
RADIUS_DEBUG("Failed to initialize EAP state machine for the "
"new session");
radius_server_session_free(data, sess);
return NULL;
}
sess->eap_if = eap_get_interface(sess->eap);
sess->eap_if->eapRestart = TRUE;
sess->eap_if->portEnabled = TRUE;
RADIUS_DEBUG("New session 0x%x initialized", sess->sess_id);
return sess;
}
static struct radius_msg *
radius_server_encapsulate_eap(struct radius_server_data *data,
struct radius_client *client,
struct radius_session *sess,
struct radius_msg *request)
{
struct radius_msg *msg;
int code;
unsigned int sess_id;
struct radius_hdr *hdr = radius_msg_get_hdr(request);
if (sess->eap_if->eapFail) {
sess->eap_if->eapFail = FALSE;
code = RADIUS_CODE_ACCESS_REJECT;
} else if (sess->eap_if->eapSuccess) {
sess->eap_if->eapSuccess = FALSE;
code = RADIUS_CODE_ACCESS_ACCEPT;
} else {
sess->eap_if->eapReq = FALSE;
code = RADIUS_CODE_ACCESS_CHALLENGE;
}
msg = radius_msg_new(code, hdr->identifier);
if (msg == NULL) {
RADIUS_DEBUG("Failed to allocate reply message");
return NULL;
}
sess_id = htonl(sess->sess_id);
if (code == RADIUS_CODE_ACCESS_CHALLENGE &&
!radius_msg_add_attr(msg, RADIUS_ATTR_STATE,
(u8 *) &sess_id, sizeof(sess_id))) {
RADIUS_DEBUG("Failed to add State attribute");
}
if (sess->eap_if->eapReqData &&
!radius_msg_add_eap(msg, wpabuf_head(sess->eap_if->eapReqData),
wpabuf_len(sess->eap_if->eapReqData))) {
RADIUS_DEBUG("Failed to add EAP-Message attribute");
}
if (code == RADIUS_CODE_ACCESS_ACCEPT && sess->eap_if->eapKeyData) {
int len;
if (sess->eap_if->eapKeyDataLen > 64) {
len = 32;
} else {
len = sess->eap_if->eapKeyDataLen / 2;
}
if (!radius_msg_add_mppe_keys(msg, hdr->authenticator,
(u8 *) client->shared_secret,
client->shared_secret_len,
sess->eap_if->eapKeyData + len,
len, sess->eap_if->eapKeyData,
len)) {
RADIUS_DEBUG("Failed to add MPPE key attributes");
}
}
if (radius_msg_copy_attr(msg, request, RADIUS_ATTR_PROXY_STATE) < 0) {
RADIUS_DEBUG("Failed to copy Proxy-State attribute(s)");
radius_msg_free(msg);
return NULL;
}
if (radius_msg_finish_srv(msg, (u8 *) client->shared_secret,
client->shared_secret_len,
hdr->authenticator) < 0) {
RADIUS_DEBUG("Failed to add Message-Authenticator attribute");
}
return msg;
}
static int radius_server_reject(struct radius_server_data *data,
struct radius_client *client,
struct radius_msg *request,
struct sockaddr *from, socklen_t fromlen,
const char *from_addr, int from_port)
{
struct radius_msg *msg;
int ret = 0;
struct eap_hdr eapfail;
struct wpabuf *buf;
struct radius_hdr *hdr = radius_msg_get_hdr(request);
RADIUS_DEBUG("Reject invalid request from %s:%d",
from_addr, from_port);
msg = radius_msg_new(RADIUS_CODE_ACCESS_REJECT, hdr->identifier);
if (msg == NULL) {
return -1;
}
os_memset(&eapfail, 0, sizeof(eapfail));
eapfail.code = EAP_CODE_FAILURE;
eapfail.identifier = 0;
eapfail.length = host_to_be16(sizeof(eapfail));
if (!radius_msg_add_eap(msg, (u8 *) &eapfail, sizeof(eapfail))) {
RADIUS_DEBUG("Failed to add EAP-Message attribute");
}
if (radius_msg_copy_attr(msg, request, RADIUS_ATTR_PROXY_STATE) < 0) {
RADIUS_DEBUG("Failed to copy Proxy-State attribute(s)");
radius_msg_free(msg);
return -1;
}
if (radius_msg_finish_srv(msg, (u8 *) client->shared_secret,
client->shared_secret_len,
hdr->authenticator) <
0) {
RADIUS_DEBUG("Failed to add Message-Authenticator attribute");
}
if (wpa_debug_level <= MSG_MSGDUMP) {
radius_msg_dump(msg);
}
data->counters.access_rejects++;
client->counters.access_rejects++;
buf = radius_msg_get_buf(msg);
if (sendto(data->auth_sock, wpabuf_head(buf), wpabuf_len(buf), 0,
(struct sockaddr *) from, sizeof(*from)) < 0) {
perror("sendto[RADIUS SRV]");
ret = -1;
}
radius_msg_free(msg);
return ret;
}
static int radius_server_request(struct radius_server_data *data,
struct radius_msg *msg,
struct sockaddr *from, socklen_t fromlen,
struct radius_client *client,
const char *from_addr, int from_port,
struct radius_session *force_sess)
{
u8 *eap = NULL;
size_t eap_len;
int res, state_included = 0;
u8 statebuf[4];
unsigned int state;
struct radius_session *sess;
struct radius_msg *reply;
int is_complete = 0;
if (force_sess)
sess = force_sess;
else {
res = radius_msg_get_attr(msg, RADIUS_ATTR_STATE, statebuf,
sizeof(statebuf));
state_included = res >= 0;
if (res == sizeof(statebuf)) {
state = WPA_GET_BE32(statebuf);
sess = radius_server_get_session(client, state);
} else {
sess = NULL;
}
}
if (sess) {
RADIUS_DEBUG("Request for session 0x%x", sess->sess_id);
} else if (state_included) {
RADIUS_DEBUG("State attribute included but no session found");
radius_server_reject(data, client, msg, from, fromlen,
from_addr, from_port);
return -1;
} else {
sess = radius_server_get_new_session(data, client, msg);
if (sess == NULL) {
RADIUS_DEBUG("Could not create a new session");
radius_server_reject(data, client, msg, from, fromlen,
from_addr, from_port);
return -1;
}
}
if (sess->last_from_port == from_port &&
sess->last_identifier == radius_msg_get_hdr(msg)->identifier &&
os_memcmp(sess->last_authenticator,
radius_msg_get_hdr(msg)->authenticator, 16) == 0) {
RADIUS_DEBUG("Duplicate message from %s", from_addr);
data->counters.dup_access_requests++;
client->counters.dup_access_requests++;
if (sess->last_reply) {
struct wpabuf *buf;
buf = radius_msg_get_buf(sess->last_reply);
res = sendto(data->auth_sock, wpabuf_head(buf),
wpabuf_len(buf), 0,
(struct sockaddr *) from, fromlen);
if (res < 0) {
perror("sendto[RADIUS SRV]");
}
return 0;
}
RADIUS_DEBUG("No previous reply available for duplicate "
"message");
return -1;
}
eap = radius_msg_get_eap(msg, &eap_len);
if (eap == NULL) {
RADIUS_DEBUG("No EAP-Message in RADIUS packet from %s",
from_addr);
data->counters.packets_dropped++;
client->counters.packets_dropped++;
return -1;
}
RADIUS_DUMP("Received EAP data", eap, eap_len);
/* FIX: if Code is Request, Success, or Failure, send Access-Reject;
* RFC3579 Sect. 2.6.2.
* Include EAP-Response/Nak with no preferred method if
* code == request.
* If code is not 1-4, discard the packet silently.
* Or is this already done by the EAP state machine? */
wpabuf_free(sess->eap_if->eapRespData);
sess->eap_if->eapRespData = wpabuf_alloc_ext_data(eap, eap_len);
if (sess->eap_if->eapRespData == NULL)
os_free(eap);
eap = NULL;
sess->eap_if->eapResp = TRUE;
eap_server_sm_step(sess->eap);
if ((sess->eap_if->eapReq || sess->eap_if->eapSuccess ||
sess->eap_if->eapFail) && sess->eap_if->eapReqData) {
RADIUS_DUMP("EAP data from the state machine",
wpabuf_head(sess->eap_if->eapReqData),
wpabuf_len(sess->eap_if->eapReqData));
} else if (sess->eap_if->eapFail) {
RADIUS_DEBUG("No EAP data from the state machine, but eapFail "
"set");
} else if (eap_sm_method_pending(sess->eap)) {
radius_msg_free(sess->last_msg);
sess->last_msg = msg;
sess->last_from_port = from_port;
os_free(sess->last_from_addr);
sess->last_from_addr = os_strdup(from_addr);
sess->last_fromlen = fromlen;
os_memcpy(&sess->last_from, from, fromlen);
return -2;
} else {
RADIUS_DEBUG("No EAP data from the state machine - ignore this"
" Access-Request silently (assuming it was a "
"duplicate)");
data->counters.packets_dropped++;
client->counters.packets_dropped++;
return -1;
}
if (sess->eap_if->eapSuccess || sess->eap_if->eapFail)
is_complete = 1;
reply = radius_server_encapsulate_eap(data, client, sess, msg);
if (reply) {
struct wpabuf *buf;
struct radius_hdr *hdr;
RADIUS_DEBUG("Reply to %s:%d", from_addr, from_port);
if (wpa_debug_level <= MSG_MSGDUMP) {
radius_msg_dump(reply);
}
switch (radius_msg_get_hdr(reply)->code) {
case RADIUS_CODE_ACCESS_ACCEPT:
data->counters.access_accepts++;
client->counters.access_accepts++;
break;
case RADIUS_CODE_ACCESS_REJECT:
data->counters.access_rejects++;
client->counters.access_rejects++;
break;
case RADIUS_CODE_ACCESS_CHALLENGE:
data->counters.access_challenges++;
client->counters.access_challenges++;
break;
}
buf = radius_msg_get_buf(reply);
res = sendto(data->auth_sock, wpabuf_head(buf),
wpabuf_len(buf), 0,
(struct sockaddr *) from, fromlen);
if (res < 0) {
perror("sendto[RADIUS SRV]");
}
radius_msg_free(sess->last_reply);
sess->last_reply = reply;
sess->last_from_port = from_port;
hdr = radius_msg_get_hdr(msg);
sess->last_identifier = hdr->identifier;
os_memcpy(sess->last_authenticator, hdr->authenticator, 16);
} else {
data->counters.packets_dropped++;
client->counters.packets_dropped++;
}
if (is_complete) {
RADIUS_DEBUG("Removing completed session 0x%x after timeout",
sess->sess_id);
eloop_cancel_timeout(radius_server_session_remove_timeout,
data, sess);
eloop_register_timeout(10, 0,
radius_server_session_remove_timeout,
data, sess);
}
return 0;
}
static void radius_server_receive_auth(int sock, void *eloop_ctx,
void *sock_ctx)
{
struct radius_server_data *data = eloop_ctx;
u8 *buf = NULL;
union {
struct sockaddr_storage ss;
struct sockaddr_in sin;
#ifdef CONFIG_IPV6
struct sockaddr_in6 sin6;
#endif /* CONFIG_IPV6 */
} from;
socklen_t fromlen;
int len;
struct radius_client *client = NULL;
struct radius_msg *msg = NULL;
char abuf[50];
int from_port = 0;
buf = os_malloc(RADIUS_MAX_MSG_LEN);
if (buf == NULL) {
goto fail;
}
fromlen = sizeof(from);
len = recvfrom(sock, buf, RADIUS_MAX_MSG_LEN, 0,
(struct sockaddr *) &from.ss, &fromlen);
if (len < 0) {
perror("recvfrom[radius_server]");
goto fail;
}
#ifdef CONFIG_IPV6
if (data->ipv6) {
if (inet_ntop(AF_INET6, &from.sin6.sin6_addr, abuf,
sizeof(abuf)) == NULL)
abuf[0] = '\0';
from_port = ntohs(from.sin6.sin6_port);
RADIUS_DEBUG("Received %d bytes from %s:%d",
len, abuf, from_port);
client = radius_server_get_client(data,
(struct in_addr *)
&from.sin6.sin6_addr, 1);
}
#endif /* CONFIG_IPV6 */
if (!data->ipv6) {
os_strlcpy(abuf, inet_ntoa(from.sin.sin_addr), sizeof(abuf));
from_port = ntohs(from.sin.sin_port);
RADIUS_DEBUG("Received %d bytes from %s:%d",
len, abuf, from_port);
client = radius_server_get_client(data, &from.sin.sin_addr, 0);
}
RADIUS_DUMP("Received data", buf, len);
if (client == NULL) {
RADIUS_DEBUG("Unknown client %s - packet ignored", abuf);
data->counters.invalid_requests++;
goto fail;
}
msg = radius_msg_parse(buf, len);
if (msg == NULL) {
RADIUS_DEBUG("Parsing incoming RADIUS frame failed");
data->counters.malformed_access_requests++;
client->counters.malformed_access_requests++;
goto fail;
}
os_free(buf);
buf = NULL;
if (wpa_debug_level <= MSG_MSGDUMP) {
radius_msg_dump(msg);
}
if (radius_msg_get_hdr(msg)->code != RADIUS_CODE_ACCESS_REQUEST) {
RADIUS_DEBUG("Unexpected RADIUS code %d",
radius_msg_get_hdr(msg)->code);
data->counters.unknown_types++;
client->counters.unknown_types++;
goto fail;
}
data->counters.access_requests++;
client->counters.access_requests++;
if (radius_msg_verify_msg_auth(msg, (u8 *) client->shared_secret,
client->shared_secret_len, NULL)) {
RADIUS_DEBUG("Invalid Message-Authenticator from %s", abuf);
data->counters.bad_authenticators++;
client->counters.bad_authenticators++;
goto fail;
}
if (radius_server_request(data, msg, (struct sockaddr *) &from,
fromlen, client, abuf, from_port, NULL) ==
-2)
return; /* msg was stored with the session */
fail:
radius_msg_free(msg);
os_free(buf);
}
static int radius_server_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_server_open_socket(int port)
{
int s;
struct sockaddr_in addr;
s = socket(PF_INET, SOCK_DGRAM, 0);
if (s < 0) {
perror("socket");
return -1;
}
radius_server_disable_pmtu_discovery(s);
os_memset(&addr, 0, sizeof(addr));
addr.sin_family = AF_INET;
addr.sin_port = htons(port);
if (bind(s, (struct sockaddr *) &addr, sizeof(addr)) < 0) {
perror("bind");
close(s);
return -1;
}
return s;
}
#ifdef CONFIG_IPV6
static int radius_server_open_socket6(int port)
{
int s;
struct sockaddr_in6 addr;
s = socket(PF_INET6, SOCK_DGRAM, 0);
if (s < 0) {
perror("socket[IPv6]");
return -1;
}
os_memset(&addr, 0, sizeof(addr));
addr.sin6_family = AF_INET6;
os_memcpy(&addr.sin6_addr, &in6addr_any, sizeof(in6addr_any));
addr.sin6_port = htons(port);
if (bind(s, (struct sockaddr *) &addr, sizeof(addr)) < 0) {
perror("bind");
close(s);
return -1;
}
return s;
}
#endif /* CONFIG_IPV6 */
static void radius_server_free_sessions(struct radius_server_data *data,
struct radius_session *sessions)
{
struct radius_session *session, *prev;
session = sessions;
while (session) {
prev = session;
session = session->next;
radius_server_session_free(data, prev);
}
}
static void radius_server_free_clients(struct radius_server_data *data,
struct radius_client *clients)
{
struct radius_client *client, *prev;
client = clients;
while (client) {
prev = client;
client = client->next;
radius_server_free_sessions(data, prev->sessions);
os_free(prev->shared_secret);
os_free(prev);
}
}
static struct radius_client *
radius_server_read_clients(const char *client_file, int ipv6)
{
FILE *f;
const int buf_size = 1024;
char *buf, *pos;
struct radius_client *clients, *tail, *entry;
int line = 0, mask, failed = 0, i;
struct in_addr addr;
#ifdef CONFIG_IPV6
struct in6_addr addr6;
#endif /* CONFIG_IPV6 */
unsigned int val;
f = fopen(client_file, "r");
if (f == NULL) {
RADIUS_ERROR("Could not open client file '%s'", client_file);
return NULL;
}
buf = os_malloc(buf_size);
if (buf == NULL) {
fclose(f);
return NULL;
}
clients = tail = NULL;
while (fgets(buf, buf_size, f)) {
/* Configuration file format:
* 192.168.1.0/24 secret
* 192.168.1.2 secret
* fe80::211:22ff:fe33:4455/64 secretipv6
*/
line++;
buf[buf_size - 1] = '\0';
pos = buf;
while (*pos != '\0' && *pos != '\n')
pos++;
if (*pos == '\n')
*pos = '\0';
if (*buf == '\0' || *buf == '#')
continue;
pos = buf;
while ((*pos >= '0' && *pos <= '9') || *pos == '.' ||
(*pos >= 'a' && *pos <= 'f') || *pos == ':' ||
(*pos >= 'A' && *pos <= 'F')) {
pos++;
}
if (*pos == '\0') {
failed = 1;
break;
}
if (*pos == '/') {
char *end;
*pos++ = '\0';
mask = strtol(pos, &end, 10);
if ((pos == end) ||
(mask < 0 || mask > (ipv6 ? 128 : 32))) {
failed = 1;
break;
}
pos = end;
} else {
mask = ipv6 ? 128 : 32;
*pos++ = '\0';
}
if (!ipv6 && inet_aton(buf, &addr) == 0) {
failed = 1;
break;
}
#ifdef CONFIG_IPV6
if (ipv6 && inet_pton(AF_INET6, buf, &addr6) <= 0) {
if (inet_pton(AF_INET, buf, &addr) <= 0) {
failed = 1;
break;
}
/* Convert IPv4 address to IPv6 */
if (mask <= 32)
mask += (128 - 32);
os_memset(addr6.s6_addr, 0, 10);
addr6.s6_addr[10] = 0xff;
addr6.s6_addr[11] = 0xff;
os_memcpy(addr6.s6_addr + 12, (char *) &addr.s_addr,
4);
}
#endif /* CONFIG_IPV6 */
while (*pos == ' ' || *pos == '\t') {
pos++;
}
if (*pos == '\0') {
failed = 1;
break;
}
entry = os_zalloc(sizeof(*entry));
if (entry == NULL) {
failed = 1;
break;
}
entry->shared_secret = os_strdup(pos);
if (entry->shared_secret == NULL) {
failed = 1;
os_free(entry);
break;
}
entry->shared_secret_len = os_strlen(entry->shared_secret);
entry->addr.s_addr = addr.s_addr;
if (!ipv6) {
val = 0;
for (i = 0; i < mask; i++)
val |= 1 << (31 - i);
entry->mask.s_addr = htonl(val);
}
#ifdef CONFIG_IPV6
if (ipv6) {
int offset = mask / 8;
os_memcpy(entry->addr6.s6_addr, addr6.s6_addr, 16);
os_memset(entry->mask6.s6_addr, 0xff, offset);
val = 0;
for (i = 0; i < (mask % 8); i++)
val |= 1 << (7 - i);
if (offset < 16)
entry->mask6.s6_addr[offset] = val;
}
#endif /* CONFIG_IPV6 */
if (tail == NULL) {
clients = tail = entry;
} else {
tail->next = entry;
tail = entry;
}
}
if (failed) {
RADIUS_ERROR("Invalid line %d in '%s'", line, client_file);
radius_server_free_clients(NULL, clients);
clients = NULL;
}
os_free(buf);
fclose(f);
return clients;
}
/**
* radius_server_init - Initialize RADIUS server
* @conf: Configuration for the RADIUS server
* Returns: Pointer to private RADIUS server context or %NULL on failure
*
* This initializes a RADIUS server instance and returns a context pointer that
* will be used in other calls to the RADIUS server module. The server can be
* deinitialize by calling radius_server_deinit().
*/
struct radius_server_data *
radius_server_init(struct radius_server_conf *conf)
{
struct radius_server_data *data;
#ifndef CONFIG_IPV6
if (conf->ipv6) {
fprintf(stderr, "RADIUS server compiled without IPv6 "
"support.\n");
return NULL;
}
#endif /* CONFIG_IPV6 */
data = os_zalloc(sizeof(*data));
if (data == NULL)
return NULL;
os_get_time(&data->start_time);
data->conf_ctx = conf->conf_ctx;
data->eap_sim_db_priv = conf->eap_sim_db_priv;
data->ssl_ctx = conf->ssl_ctx;
data->msg_ctx = conf->msg_ctx;
data->ipv6 = conf->ipv6;
if (conf->pac_opaque_encr_key) {
data->pac_opaque_encr_key = os_malloc(16);
os_memcpy(data->pac_opaque_encr_key, conf->pac_opaque_encr_key,
16);
}
if (conf->eap_fast_a_id) {
data->eap_fast_a_id = os_malloc(conf->eap_fast_a_id_len);
if (data->eap_fast_a_id) {
os_memcpy(data->eap_fast_a_id, conf->eap_fast_a_id,
conf->eap_fast_a_id_len);
data->eap_fast_a_id_len = conf->eap_fast_a_id_len;
}
}
if (conf->eap_fast_a_id_info)
data->eap_fast_a_id_info = os_strdup(conf->eap_fast_a_id_info);
data->eap_fast_prov = conf->eap_fast_prov;
data->pac_key_lifetime = conf->pac_key_lifetime;
data->pac_key_refresh_time = conf->pac_key_refresh_time;
data->get_eap_user = conf->get_eap_user;
data->eap_sim_aka_result_ind = conf->eap_sim_aka_result_ind;
data->tnc = conf->tnc;
data->wps = conf->wps;
data->pwd_group = conf->pwd_group;
if (conf->eap_req_id_text) {
data->eap_req_id_text = os_malloc(conf->eap_req_id_text_len);
if (data->eap_req_id_text) {
os_memcpy(data->eap_req_id_text, conf->eap_req_id_text,
conf->eap_req_id_text_len);
data->eap_req_id_text_len = conf->eap_req_id_text_len;
}
}
data->clients = radius_server_read_clients(conf->client_file,
conf->ipv6);
if (data->clients == NULL) {
printf("No RADIUS clients configured.\n");
radius_server_deinit(data);
return NULL;
}
#ifdef CONFIG_IPV6
if (conf->ipv6)
data->auth_sock = radius_server_open_socket6(conf->auth_port);
else
#endif /* CONFIG_IPV6 */
data->auth_sock = radius_server_open_socket(conf->auth_port);
if (data->auth_sock < 0) {
printf("Failed to open UDP socket for RADIUS authentication "
"server\n");
radius_server_deinit(data);
return NULL;
}
if (eloop_register_read_sock(data->auth_sock,
radius_server_receive_auth,
data, NULL)) {
radius_server_deinit(data);
return NULL;
}
return data;
}
/**
* radius_server_deinit - Deinitialize RADIUS server
* @data: RADIUS server context from radius_server_init()
*/
void radius_server_deinit(struct radius_server_data *data)
{
if (data == NULL)
return;
if (data->auth_sock >= 0) {
eloop_unregister_read_sock(data->auth_sock);
close(data->auth_sock);
}
radius_server_free_clients(data, data->clients);
os_free(data->pac_opaque_encr_key);
os_free(data->eap_fast_a_id);
os_free(data->eap_fast_a_id_info);
os_free(data->eap_req_id_text);
os_free(data);
}
/**
* radius_server_get_mib - Get RADIUS server MIB information
* @data: RADIUS server context from radius_server_init()
* @buf: Buffer for returning the MIB data in text format
* @buflen: buf length in octets
* Returns: Number of octets written into buf
*/
int radius_server_get_mib(struct radius_server_data *data, char *buf,
size_t buflen)
{
int ret, uptime;
unsigned int idx;
char *end, *pos;
struct os_time now;
struct radius_client *cli;
/* RFC 2619 - RADIUS Authentication Server MIB */
if (data == NULL || buflen == 0)
return 0;
pos = buf;
end = buf + buflen;
os_get_time(&now);
uptime = (now.sec - data->start_time.sec) * 100 +
((now.usec - data->start_time.usec) / 10000) % 100;
ret = os_snprintf(pos, end - pos,
"RADIUS-AUTH-SERVER-MIB\n"
"radiusAuthServIdent=hostapd\n"
"radiusAuthServUpTime=%d\n"
"radiusAuthServResetTime=0\n"
"radiusAuthServConfigReset=4\n",
uptime);
if (ret < 0 || ret >= end - pos) {
*pos = '\0';
return pos - buf;
}
pos += ret;
ret = os_snprintf(pos, end - pos,
"radiusAuthServTotalAccessRequests=%u\n"
"radiusAuthServTotalInvalidRequests=%u\n"
"radiusAuthServTotalDupAccessRequests=%u\n"
"radiusAuthServTotalAccessAccepts=%u\n"
"radiusAuthServTotalAccessRejects=%u\n"
"radiusAuthServTotalAccessChallenges=%u\n"
"radiusAuthServTotalMalformedAccessRequests=%u\n"
"radiusAuthServTotalBadAuthenticators=%u\n"
"radiusAuthServTotalPacketsDropped=%u\n"
"radiusAuthServTotalUnknownTypes=%u\n",
data->counters.access_requests,
data->counters.invalid_requests,
data->counters.dup_access_requests,
data->counters.access_accepts,
data->counters.access_rejects,
data->counters.access_challenges,
data->counters.malformed_access_requests,
data->counters.bad_authenticators,
data->counters.packets_dropped,
data->counters.unknown_types);
if (ret < 0 || ret >= end - pos) {
*pos = '\0';
return pos - buf;
}
pos += ret;
for (cli = data->clients, idx = 0; cli; cli = cli->next, idx++) {
char abuf[50], mbuf[50];
#ifdef CONFIG_IPV6
if (data->ipv6) {
if (inet_ntop(AF_INET6, &cli->addr6, abuf,
sizeof(abuf)) == NULL)
abuf[0] = '\0';
if (inet_ntop(AF_INET6, &cli->mask6, abuf,
sizeof(mbuf)) == NULL)
mbuf[0] = '\0';
}
#endif /* CONFIG_IPV6 */
if (!data->ipv6) {
os_strlcpy(abuf, inet_ntoa(cli->addr), sizeof(abuf));
os_strlcpy(mbuf, inet_ntoa(cli->mask), sizeof(mbuf));
}
ret = os_snprintf(pos, end - pos,
"radiusAuthClientIndex=%u\n"
"radiusAuthClientAddress=%s/%s\n"
"radiusAuthServAccessRequests=%u\n"
"radiusAuthServDupAccessRequests=%u\n"
"radiusAuthServAccessAccepts=%u\n"
"radiusAuthServAccessRejects=%u\n"
"radiusAuthServAccessChallenges=%u\n"
"radiusAuthServMalformedAccessRequests=%u\n"
"radiusAuthServBadAuthenticators=%u\n"
"radiusAuthServPacketsDropped=%u\n"
"radiusAuthServUnknownTypes=%u\n",
idx,
abuf, mbuf,
cli->counters.access_requests,
cli->counters.dup_access_requests,
cli->counters.access_accepts,
cli->counters.access_rejects,
cli->counters.access_challenges,
cli->counters.malformed_access_requests,
cli->counters.bad_authenticators,
cli->counters.packets_dropped,
cli->counters.unknown_types);
if (ret < 0 || ret >= end - pos) {
*pos = '\0';
return pos - buf;
}
pos += ret;
}
return pos - buf;
}
static int radius_server_get_eap_user(void *ctx, const u8 *identity,
size_t identity_len, int phase2,
struct eap_user *user)
{
struct radius_session *sess = ctx;
struct radius_server_data *data = sess->server;
return data->get_eap_user(data->conf_ctx, identity, identity_len,
phase2, user);
}
static const char * radius_server_get_eap_req_id_text(void *ctx, size_t *len)
{
struct radius_session *sess = ctx;
struct radius_server_data *data = sess->server;
*len = data->eap_req_id_text_len;
return data->eap_req_id_text;
}
static struct eapol_callbacks radius_server_eapol_cb =
{
.get_eap_user = radius_server_get_eap_user,
.get_eap_req_id_text = radius_server_get_eap_req_id_text,
};
/**
* radius_server_eap_pending_cb - Pending EAP data notification
* @data: RADIUS server context from radius_server_init()
* @ctx: Pending EAP context pointer
*
* This function is used to notify EAP server module that a pending operation
* has been completed and processing of the EAP session can proceed.
*/
void radius_server_eap_pending_cb(struct radius_server_data *data, void *ctx)
{
struct radius_client *cli;
struct radius_session *s, *sess = NULL;
struct radius_msg *msg;
if (data == NULL)
return;
for (cli = data->clients; cli; cli = cli->next) {
for (s = cli->sessions; s; s = s->next) {
if (s->eap == ctx && s->last_msg) {
sess = s;
break;
}
if (sess)
break;
}
if (sess)
break;
}
if (sess == NULL) {
RADIUS_DEBUG("No session matched callback ctx");
return;
}
msg = sess->last_msg;
sess->last_msg = NULL;
eap_sm_pending_cb(sess->eap);
if (radius_server_request(data, msg,
(struct sockaddr *) &sess->last_from,
sess->last_fromlen, cli,
sess->last_from_addr,
sess->last_from_port, sess) == -2)
return; /* msg was stored with the session */
radius_msg_free(msg);
}
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