static fr_io_final_t mod_process(UNUSED void const *instance, REQUEST *request, fr_io_action_t action)
{
VALUE_PAIR *vp;
rlm_rcode_t rcode;
CONF_SECTION *unlang;
fr_dict_enum_t const *dv;
REQUEST_VERIFY(request);
/*
* Pass this through asynchronously to the module which
* is waiting for something to happen.
*/
if (action != FR_IO_ACTION_RUN) {
unlang_interpret_signal(request, (fr_state_signal_t) action);
return FR_IO_DONE;
}
switch (request->request_state) {
case REQUEST_INIT:
if (request->parent && RDEBUG_ENABLED) {
RDEBUG("Received %s ID %i", fr_packet_codes[request->packet->code], request->packet->id);
log_request_pair_list(L_DBG_LVL_1, request, request->packet->vps, "");
}
request->component = "radius";
/*
* We can run CoA-Request or Disconnect-Request sections here
*/
dv = fr_dict_enum_by_value(attr_packet_type, fr_box_uint32(request->packet->code));
if (!dv) {
REDEBUG("Failed to find value for &request:Packet-Type");
return FR_IO_FAIL;
}
unlang = cf_section_find(request->server_cs, "recv", dv->alias);
if (!unlang) {
REDEBUG("Failed to find 'recv %s' section", dv->alias);
return FR_IO_FAIL;
}
RDEBUG("Running 'recv %s' from file %s", dv->alias, cf_filename(unlang));
unlang_interpret_push_section(request, unlang, RLM_MODULE_NOOP, UNLANG_TOP_FRAME);
request->request_state = REQUEST_RECV;
/* FALL-THROUGH */
case REQUEST_RECV:
rcode = unlang_interpret_resume(request);
if (request->master_state == REQUEST_STOP_PROCESSING) return FR_IO_DONE;
if (rcode == RLM_MODULE_YIELD) return FR_IO_YIELD;
rad_assert(request->log.unlang_indent == 0);
switch (rcode) {
case RLM_MODULE_NOOP:
case RLM_MODULE_NOTFOUND:
case RLM_MODULE_OK:
case RLM_MODULE_UPDATED:
request->reply->code = request->packet->code + 1; /* ACK */
break;
case RLM_MODULE_HANDLED:
break;
case RLM_MODULE_FAIL:
case RLM_MODULE_INVALID:
case RLM_MODULE_REJECT:
case RLM_MODULE_USERLOCK:
default:
request->reply->code = request->packet->code + 2; /* NAK */
break;
}
/*
* Allow for over-ride of reply code.
*/
vp = fr_pair_find_by_da(request->reply->vps, attr_packet_type, TAG_ANY);
if (vp) request->reply->code = vp->vp_uint32;
dv = fr_dict_enum_by_value(attr_packet_type, fr_box_uint32(request->reply->code));
unlang = NULL;
if (dv) unlang = cf_section_find(request->server_cs, "send", dv->alias);
if (!unlang) goto send_reply;
/*
* Note that for NAKs, we do NOT use
* reject_delay. This is because we're acting as
* a NAS, and we want to respond to the RADIUS
* server as quickly as possible.
*/
rerun_nak:
RDEBUG("Running 'send %s' from file %s", cf_section_name2(unlang), cf_filename(unlang));
unlang_interpret_push_section(request, unlang, RLM_MODULE_NOOP, UNLANG_TOP_FRAME);
rad_assert(request->log.unlang_indent == 0);
request->request_state = REQUEST_SEND;
/* FALL-THROUGH */
case REQUEST_SEND:
rcode = unlang_interpret_resume(request);
if (request->master_state == REQUEST_STOP_PROCESSING) return FR_IO_DONE;
if (rcode == RLM_MODULE_YIELD) return FR_IO_YIELD;
rad_assert(request->log.unlang_indent == 0);
switch (rcode) {
/*
* We need to send CoA-NAK back if Service-Type
* is Authorize-Only. Rely on the user's policy
* to do that. We're not a real NAS, so this
* restriction doesn't (ahem) apply to us.
*/
case RLM_MODULE_FAIL:
case RLM_MODULE_INVALID:
case RLM_MODULE_REJECT:
case RLM_MODULE_USERLOCK:
default:
/*
* If we over-ride an ACK with a NAK, run
* the NAK section.
*/
if (request->reply->code == request->packet->code + 1) {
dv = fr_dict_enum_by_value(attr_packet_type, fr_box_uint32(request->reply->code));
RWDEBUG("Failed running 'send %s', trying corresponding NAK section.", dv->alias);
request->reply->code = request->packet->code + 2;
dv = fr_dict_enum_by_value(attr_packet_type, fr_box_uint32(request->reply->code));
unlang = NULL;
if (!dv) goto send_reply;
unlang = cf_section_find(request->server_cs, "send", dv->alias);
if (unlang) goto rerun_nak;
RWDEBUG("Not running 'send %s' section as it does not exist", dv->alias);
}
/*
* Else it was already a NAK or something else.
*/
break;
case RLM_MODULE_HANDLED:
case RLM_MODULE_NOOP:
case RLM_MODULE_NOTFOUND:
case RLM_MODULE_OK:
case RLM_MODULE_UPDATED:
/* reply code is already set */
break;
}
send_reply:
gettimeofday(&request->reply->timestamp, NULL);
/*
* Check for "do not respond".
*/
if (request->reply->code == FR_CODE_DO_NOT_RESPOND) {
RDEBUG("Not sending reply to client.");
break;
}
if (request->parent && RDEBUG_ENABLED) {
RDEBUG("Sending %s ID %i", fr_packet_codes[request->reply->code], request->reply->id);
log_request_pair_list(L_DBG_LVL_1, request, request->reply->vps, "");
}
break;
default:
return FR_IO_FAIL;
}
return FR_IO_REPLY;
}
static FR_CODE eap_fast_eap_payload(REQUEST *request, eap_session_t *eap_session,
tls_session_t *tls_session, VALUE_PAIR *tlv_eap_payload)
{
FR_CODE code = FR_CODE_ACCESS_REJECT;
rlm_rcode_t rcode;
VALUE_PAIR *vp;
eap_fast_tunnel_t *t;
REQUEST *fake;
RDEBUG2("Processing received EAP Payload");
/*
* Allocate a fake REQUEST structure.
*/
fake = request_alloc_fake(request, NULL);
rad_assert(!fake->packet->vps);
t = talloc_get_type_abort(tls_session->opaque, eap_fast_tunnel_t);
/*
* Add the tunneled attributes to the fake request.
*/
fake->packet->vps = fr_pair_afrom_da(fake->packet, attr_eap_message);
fr_pair_value_memcpy(fake->packet->vps, tlv_eap_payload->vp_octets, tlv_eap_payload->vp_length, false);
RDEBUG2("Got tunneled request");
log_request_pair_list(L_DBG_LVL_1, request, fake->packet->vps, NULL);
/*
* Tell the request that it's a fake one.
*/
MEM(fr_pair_add_by_da(fake->packet, &vp, &fake->packet->vps, attr_freeradius_proxied_to) >= 0);
fr_pair_value_from_str(vp, "127.0.0.1", sizeof("127.0.0.1"), '\0', false);
/*
* Update other items in the REQUEST data structure.
*/
fake->username = fr_pair_find_by_da(fake->packet->vps, attr_user_name, TAG_ANY);
fake->password = fr_pair_find_by_da(fake->packet->vps, attr_user_password, TAG_ANY);
/*
* No User-Name, try to create one from stored data.
*/
if (!fake->username) {
/*
* No User-Name in the stored data, look for
* an EAP-Identity, and pull it out of there.
*/
if (!t->username) {
vp = fr_pair_find_by_da(fake->packet->vps, attr_eap_message, TAG_ANY);
if (vp &&
(vp->vp_length >= EAP_HEADER_LEN + 2) &&
(vp->vp_strvalue[0] == FR_EAP_CODE_RESPONSE) &&
(vp->vp_strvalue[EAP_HEADER_LEN] == FR_EAP_METHOD_IDENTITY) &&
(vp->vp_strvalue[EAP_HEADER_LEN + 1] != 0)) {
/*
* Create & remember a User-Name
*/
MEM(t->username = fr_pair_afrom_da(t, attr_user_name));
t->username->vp_tainted = true;
fr_pair_value_bstrncpy(t->username, vp->vp_octets + 5, vp->vp_length - 5);
RDEBUG2("Got tunneled identity of %pV", &t->username->data);
} else {
/*
* Don't reject the request outright,
* as it's permitted to do EAP without
* user-name.
*/
RWDEBUG2("No EAP-Identity found to start EAP conversation");
}
} /* else there WAS a t->username */
if (t->username) {
vp = fr_pair_copy(fake->packet, t->username);
fr_pair_add(&fake->packet->vps, vp);
fake->username = vp;
}
} /* else the request ALREADY had a User-Name */
if (t->stage == EAP_FAST_AUTHENTICATION) { /* FIXME do this only for MSCHAPv2 */
VALUE_PAIR *tvp;
tvp = fr_pair_afrom_da(fake, attr_eap_type);
tvp->vp_uint32 = t->default_provisioning_method;
fr_pair_add(&fake->control, tvp);
/*
* RFC 5422 section 3.2.3 - Authenticating Using EAP-FAST-MSCHAPv2
*/
if (t->mode == EAP_FAST_PROVISIONING_ANON) {
tvp = fr_pair_afrom_da(fake, attr_ms_chap_challenge);
fr_pair_value_memcpy(tvp, t->keyblock->server_challenge, RADIUS_CHAP_CHALLENGE_LENGTH, false);
fr_pair_add(&fake->control, tvp);
RHEXDUMP(L_DBG_LVL_MAX, t->keyblock->server_challenge, RADIUS_CHAP_CHALLENGE_LENGTH, "MSCHAPv2 auth_challenge");
tvp = fr_pair_afrom_da(fake, attr_ms_chap_peer_challenge);
fr_pair_value_memcpy(tvp, t->keyblock->client_challenge, RADIUS_CHAP_CHALLENGE_LENGTH, false);
fr_pair_add(&fake->control, tvp);
RHEXDUMP(L_DBG_LVL_MAX, t->keyblock->client_challenge, RADIUS_CHAP_CHALLENGE_LENGTH, "MSCHAPv2 peer_challenge");
}
}
/*
* Call authentication recursively, which will
* do PAP, CHAP, MS-CHAP, etc.
*/
eap_virtual_server(request, fake, eap_session, t->virtual_server);
/*
* Decide what to do with the reply.
*/
switch (fake->reply->code) {
case 0: /* No reply code, must be proxied... */
#ifdef WITH_PROXY
vp = fr_pair_find_by_da(fake->control, attr_proxy_to_realm, TAG_ANY);
if (vp) {
int ret;
eap_tunnel_data_t *tunnel;
RDEBUG2("Tunneled authentication will be proxied to %pV", &vp->data);
/*
* Tell the original request that it's going to be proxied.
*/
fr_pair_list_copy_by_da(request, &request->control, fake->control, attr_proxy_to_realm);
/*
* Seed the proxy packet with the tunneled request.
*/
rad_assert(!request->proxy);
/*
* FIXME: Actually proxy stuff
*/
request->proxy = request_alloc_fake(request, NULL);
request->proxy->packet = talloc_steal(request->proxy, fake->packet);
memset(&request->proxy->packet->src_ipaddr, 0,
sizeof(request->proxy->packet->src_ipaddr));
memset(&request->proxy->packet->src_ipaddr, 0,
sizeof(request->proxy->packet->src_ipaddr));
request->proxy->packet->src_port = 0;
request->proxy->packet->dst_port = 0;
fake->packet = NULL;
fr_radius_packet_free(&fake->reply);
fake->reply = NULL;
/*
* Set up the callbacks for the tunnel
*/
tunnel = talloc_zero(request, eap_tunnel_data_t);
tunnel->tls_session = tls_session;
/*
* Associate the callback with the request.
*/
ret = request_data_add(request, request->proxy, REQUEST_DATA_EAP_TUNNEL_CALLBACK,
tunnel, false, false, false);
fr_cond_assert(ret == 0);
/*
* rlm_eap.c has taken care of associating the eap_session
* with the fake request.
*
* So we associate the fake request with this request.
*/
ret = request_data_add(request, request->proxy, REQUEST_DATA_EAP_MSCHAP_TUNNEL_CALLBACK,
fake, true, false, false);
fr_cond_assert(ret == 0);
fake = NULL;
/*
* Didn't authenticate the packet, but we're proxying it.
*/
code = FR_CODE_STATUS_CLIENT;
} else
#endif /* WITH_PROXY */
{
REDEBUG("No tunneled reply was found, and the request was not proxied: rejecting the user");
code = FR_CODE_ACCESS_REJECT;
}
break;
default:
/*
* Returns RLM_MODULE_FOO, and we want to return FR_FOO
*/
rcode = process_reply(eap_session, tls_session, request, fake->reply);
switch (rcode) {
case RLM_MODULE_REJECT:
code = FR_CODE_ACCESS_REJECT;
break;
case RLM_MODULE_HANDLED:
code = FR_CODE_ACCESS_CHALLENGE;
break;
case RLM_MODULE_OK:
code = FR_CODE_ACCESS_ACCEPT;
break;
default:
code = FR_CODE_ACCESS_REJECT;
break;
}
break;
}
talloc_free(fake);
return code;
}
/*
* Process the inner tunnel data
*/
FR_CODE eap_fast_process(eap_session_t *eap_session, tls_session_t *tls_session)
{
FR_CODE code;
VALUE_PAIR *fast_vps = NULL;
fr_cursor_t cursor;
uint8_t const *data;
size_t data_len;
eap_fast_tunnel_t *t;
REQUEST *request = eap_session->request;
/*
* Just look at the buffer directly, without doing
* record_to_buff.
*/
data_len = tls_session->clean_out.used;
tls_session->clean_out.used = 0;
data = tls_session->clean_out.data;
t = talloc_get_type_abort(tls_session->opaque, eap_fast_tunnel_t);
/*
* See if the tunneled data is well formed.
*/
if (!eap_fast_verify(request, tls_session, data, data_len)) return FR_CODE_ACCESS_REJECT;
if (t->stage == EAP_FAST_TLS_SESSION_HANDSHAKE) {
rad_assert(t->mode == EAP_FAST_UNKNOWN);
char buf[256];
if (strstr(SSL_CIPHER_description(SSL_get_current_cipher(tls_session->ssl),
buf, sizeof(buf)), "Au=None")) {
/* FIXME enforce MSCHAPv2 - RFC 5422 section 3.2.2 */
RDEBUG2("Using anonymous provisioning");
t->mode = EAP_FAST_PROVISIONING_ANON;
t->pac.send = true;
} else {
if (SSL_session_reused(tls_session->ssl)) {
RDEBUG2("Session Resumed from PAC");
t->mode = EAP_FAST_NORMAL_AUTH;
} else {
RDEBUG2("Using authenticated provisioning");
t->mode = EAP_FAST_PROVISIONING_AUTH;
}
if (!t->pac.expires || t->pac.expired || t->pac.expires - time(NULL) < t->pac_lifetime * 0.6) {
t->pac.send = true;
}
}
eap_fast_init_keys(request, tls_session);
eap_fast_send_identity_request(request, tls_session, eap_session);
t->stage = EAP_FAST_AUTHENTICATION;
return FR_CODE_ACCESS_CHALLENGE;
}
fr_cursor_init(&cursor, &fast_vps);
if (eap_fast_decode_pair(request, &cursor, attr_eap_fast_tlv,
data, data_len, NULL) < 0) return FR_CODE_ACCESS_REJECT;
RDEBUG2("Got Tunneled FAST TLVs");
log_request_pair_list(L_DBG_LVL_1, request, fast_vps, NULL);
code = eap_fast_process_tlvs(request, eap_session, tls_session, fast_vps);
fr_pair_list_free(&fast_vps);
if (code == FR_CODE_ACCESS_REJECT) return FR_CODE_ACCESS_REJECT;
switch (t->stage) {
case EAP_FAST_AUTHENTICATION:
code = FR_CODE_ACCESS_CHALLENGE;
break;
case EAP_FAST_CRYPTOBIND_CHECK:
{
if (t->mode != EAP_FAST_PROVISIONING_ANON && !t->pac.send)
t->result_final = true;
eap_fast_append_result(tls_session, code);
eap_fast_update_icmk(request, tls_session, (uint8_t *)&t->isk);
eap_fast_append_crypto_binding(request, tls_session);
code = FR_CODE_ACCESS_CHALLENGE;
break;
}
case EAP_FAST_PROVISIONING:
t->result_final = true;
eap_fast_append_result(tls_session, code);
if (t->pac.send) {
RDEBUG2("Peer requires new PAC");
eap_fast_send_pac_tunnel(request, tls_session);
code = FR_CODE_ACCESS_CHALLENGE;
break;
}
t->stage = EAP_FAST_COMPLETE;
/* fallthrough */
case EAP_FAST_COMPLETE:
/*
* RFC 5422 section 3.5 - Network Access after EAP-FAST Provisioning
*/
if (t->pac.type && t->pac.expired) {
REDEBUG("Rejecting expired PAC.");
code = FR_CODE_ACCESS_REJECT;
break;
}
if (t->mode == EAP_FAST_PROVISIONING_ANON) {
REDEBUG("Rejecting unauthenticated provisioning");
code = FR_CODE_ACCESS_REJECT;
break;
}
/*
* eap_crypto_mppe_keys() is unsuitable for EAP-FAST as Cisco decided
* it would be a great idea to flip the recv/send keys around
*/
#define EAPTLS_MPPE_KEY_LEN 32
eap_add_reply(request, attr_ms_mppe_recv_key, t->msk, EAPTLS_MPPE_KEY_LEN);
eap_add_reply(request, attr_ms_mppe_send_key, &t->msk[EAPTLS_MPPE_KEY_LEN], EAPTLS_MPPE_KEY_LEN);
eap_add_reply(request, attr_eap_msk, t->msk, EAP_FAST_KEY_LEN);
eap_add_reply(request, attr_eap_emsk, t->emsk, EAP_EMSK_LEN);
break;
default:
RERROR("Internal sanity check failed in EAP-FAST at %d", t->stage);
code = FR_CODE_ACCESS_REJECT;
}
return code;
}
/** Authenticate a previously sent challenge
*
*/
static rlm_rcode_t mod_process(UNUSED void *instance, eap_session_t *eap_session)
{
REQUEST *request = eap_session->request;
eap_sim_session_t *eap_sim_session = talloc_get_type_abort(eap_session->opaque, eap_sim_session_t);
fr_sim_decode_ctx_t ctx = {
.keys = &eap_sim_session->keys,
};
VALUE_PAIR *subtype_vp, *from_peer, *vp;
fr_cursor_t cursor;
eap_sim_subtype_t subtype;
int ret;
/*
* VPS is the data from the client
*/
from_peer = eap_session->request->packet->vps;
fr_cursor_init(&cursor, &request->packet->vps);
fr_cursor_tail(&cursor);
ret = fr_sim_decode(eap_session->request,
&cursor,
dict_eap_sim,
eap_session->this_round->response->type.data,
eap_session->this_round->response->type.length,
&ctx);
/*
* RFC 4186 says we *MUST* notify, not just
* send an EAP-Failure in this case where
* we cannot decode an EAP-AKA packet.
*/
if (ret < 0) {
RPEDEBUG2("Failed decoding EAP-SIM attributes");
eap_sim_state_enter(eap_session, EAP_SIM_SERVER_FAILURE_NOTIFICATION);
return RLM_MODULE_HANDLED; /* We need to process more packets */
}
vp = fr_cursor_current(&cursor);
if (vp && RDEBUG_ENABLED2) {
RDEBUG2("Decoded EAP-SIM attributes");
log_request_pair_list(L_DBG_LVL_2, request, vp, NULL);
}
subtype_vp = fr_pair_find_by_da(from_peer, attr_eap_sim_subtype, TAG_ANY);
if (!subtype_vp) {
REDEBUG("Missing EAP-SIM-Subtype");
eap_sim_state_enter(eap_session, EAP_SIM_SERVER_FAILURE_NOTIFICATION);
return RLM_MODULE_HANDLED; /* We need to process more packets */
}
subtype = subtype_vp->vp_uint16;
switch (eap_sim_session->state) {
/*
* Response to our advertised versions and request for an ID
* This is very similar to Identity negotiation in EAP-AKA[']
*/
case EAP_SIM_SERVER_START:
switch (subtype) {
case EAP_SIM_START:
if (process_eap_sim_start(eap_session, from_peer) == 0) return RLM_MODULE_HANDLED;
eap_sim_state_enter(eap_session, EAP_SIM_SERVER_FAILURE_NOTIFICATION);
return RLM_MODULE_HANDLED; /* We need to process more packets */
/*
* Case 1 where we're allowed to send an EAP-Failure
*
* This can happen in the case of a conservative
* peer, where it refuses to provide the permanent
* identity.
*/
case EAP_SIM_CLIENT_ERROR:
{
char buff[20];
vp = fr_pair_find_by_da(from_peer, attr_eap_sim_client_error_code, TAG_ANY);
if (!vp) {
REDEBUG("EAP-SIM Peer rejected SIM-Start (%s) with client-error message but "
"has not supplied a client error code",
fr_int2str(sim_id_request_table, eap_sim_session->id_req, "<INVALID>"));
} else {
REDEBUG("Client rejected SIM-Start (%s) with error: %s (%i)",
fr_int2str(sim_id_request_table, eap_sim_session->id_req, "<INVALID>"),
fr_pair_value_enum(vp, buff), vp->vp_uint16);
}
eap_sim_state_enter(eap_session, EAP_SIM_SERVER_FAILURE);
return RLM_MODULE_REJECT;
}
case EAP_SIM_NOTIFICATION:
notification:
{
char buff[20];
vp = fr_pair_afrom_da(from_peer, attr_eap_sim_notification);
if (!vp) {
REDEBUG2("Received SIM-Notification with no notification code");
eap_sim_state_enter(eap_session, EAP_SIM_SERVER_FAILURE_NOTIFICATION);
return RLM_MODULE_HANDLED; /* We need to process more packets */
}
/*
* Case 2 where we're allowed to send an EAP-Failure
*/
if (!(vp->vp_uint16 & 0x8000)) {
REDEBUG2("SIM-Notification %s (%i) indicates failure", fr_pair_value_enum(vp, buff),
vp->vp_uint16);
eap_sim_state_enter(eap_session, EAP_SIM_SERVER_FAILURE);
return RLM_MODULE_REJECT;
}
/*
* ...if it's not a failure, then re-enter the
* current state.
*/
REDEBUG2("Got SIM-Notification %s (%i)", fr_pair_value_enum(vp, buff), vp->vp_uint16);
eap_sim_state_enter(eap_session, eap_sim_session->state);
return RLM_MODULE_HANDLED;
default:
unexpected_subtype:
/*
* RFC 4186 says we *MUST* notify, not just
* send an EAP-Failure in this case.
*/
REDEBUG("Unexpected subtype %pV", &subtype_vp->data);
eap_sim_state_enter(eap_session, EAP_SIM_SERVER_FAILURE_NOTIFICATION);
return RLM_MODULE_HANDLED; /* We need to process more packets */
}
}
/*
* Process the response to our previous challenge.
*/
case EAP_SIM_SERVER_CHALLENGE:
switch (subtype) {
/*
* A response to our EAP-Sim/Request/Challenge!
*/
case EAP_SIM_CHALLENGE:
switch (process_eap_sim_challenge(eap_session, from_peer)) {
case 1:
return RLM_MODULE_HANDLED;
case 0:
return RLM_MODULE_OK;
case -1:
eap_sim_state_enter(eap_session, EAP_SIM_SERVER_FAILURE_NOTIFICATION);
return RLM_MODULE_HANDLED; /* We need to process more packets */
}
case EAP_SIM_CLIENT_ERROR:
{
char buff[20];
vp = fr_pair_find_by_da(from_peer, attr_eap_sim_client_error_code, TAG_ANY);
if (!vp) {
REDEBUG("EAP-SIM Peer rejected SIM-Challenge with client-error message but "
"has not supplied a client error code");
} else {
REDEBUG("Client rejected SIM-Challenge with error: %s (%i)",
fr_pair_value_enum(vp, buff), vp->vp_uint16);
}
eap_sim_state_enter(eap_session, EAP_SIM_SERVER_FAILURE);
return RLM_MODULE_REJECT;
}
case EAP_SIM_NOTIFICATION:
goto notification;
default:
goto unexpected_subtype;
}
/*
* Peer acked our failure
*/
case EAP_SIM_SERVER_FAILURE_NOTIFICATION:
switch (subtype) {
case EAP_SIM_NOTIFICATION:
RDEBUG2("SIM-Notification ACKed, sending EAP-Failure");
eap_sim_state_enter(eap_session, EAP_SIM_SERVER_FAILURE);
return RLM_MODULE_REJECT;
default:
goto unexpected_subtype;
}
/*
* Something bad happened...
*/
default:
rad_assert(0);
eap_sim_state_enter(eap_session, EAP_SIM_SERVER_FAILURE_NOTIFICATION);
return RLM_MODULE_HANDLED; /* We need to process more packets */
}
}
/*
* Initiate the EAP-SIM session by starting the state machine
* and initiating the state.
*/
static rlm_rcode_t mod_session_init(void *instance, eap_session_t *eap_session)
{
REQUEST *request = eap_session->request;
eap_sim_session_t *eap_sim_session;
rlm_eap_sim_t *inst = instance;
fr_sim_id_type_t type;
fr_sim_method_hint_t method;
MEM(eap_sim_session = talloc_zero(eap_session, eap_sim_session_t));
eap_session->opaque = eap_sim_session;
/*
* Set default configuration, we may allow these
* to be toggled by attributes later.
*/
eap_sim_session->send_result_ind = inst->protected_success;
eap_sim_session->id_req = SIM_ANY_ID_REQ; /* Set the default */
/*
* This value doesn't have be strong, but it is
* good if it is different now and then.
*/
eap_sim_session->sim_id = (fr_rand() & 0xff);
/*
* Save the keying material, because it could change on a subsequent retrieval.
*/
RDEBUG2("New EAP-SIM session");
/*
* Process the identity that we received in the
* EAP-Identity-Response and use it to determine
* the initial request we send to the Supplicant.
*/
if (fr_sim_id_type(&type, &method,
eap_session->identity, talloc_array_length(eap_session->identity) - 1) < 0) {
RPWDEBUG2("Failed parsing identity, continuing anyway");
}
switch (method) {
default:
RWDEBUG("EAP-Identity-Response hints that EAP-%s should be started, but we're attempting EAP-SIM",
fr_int2str(sim_id_method_hint_table, method, "<INVALID>"));
break;
case SIM_METHOD_HINT_SIM:
case SIM_METHOD_HINT_UNKNOWN:
break;
}
eap_session->process = mod_process;
/*
* Figure out what type of identity we have
* and use it to determine the initial
* request we send.
*/
switch (type) {
/*
* These types need to be transformed into something
* usable before we can do anything.
*/
case SIM_ID_TYPE_UNKNOWN:
case SIM_ID_TYPE_PSEUDONYM:
case SIM_ID_TYPE_FASTAUTH:
/*
* Permanent ID means we can just send the challenge
*/
case SIM_ID_TYPE_PERMANENT:
eap_sim_session->keys.identity_len = talloc_array_length(eap_session->identity) - 1;
MEM(eap_sim_session->keys.identity = talloc_memdup(eap_sim_session, eap_session->identity,
eap_sim_session->keys.identity_len));
eap_sim_state_enter(eap_session, EAP_SIM_SERVER_START);
return RLM_MODULE_HANDLED;
}
return RLM_MODULE_HANDLED;
}
static fr_io_final_t mod_process(UNUSED void const *instance, REQUEST *request)
{
rlm_rcode_t rcode;
CONF_SECTION *unlang;
fr_dict_enum_t const *dv;
VALUE_PAIR *vp;
REQUEST_VERIFY(request);
switch (request->request_state) {
case REQUEST_INIT:
if (request->parent && RDEBUG_ENABLED) {
RDEBUG("Received %s ID %i", fr_packet_codes[request->packet->code], request->packet->id);
log_request_pair_list(L_DBG_LVL_1, request, request->packet->vps, "");
}
request->component = "radius";
unlang = cf_section_find(request->server_cs, "recv", "Status-Server");
if (!unlang) {
RWDEBUG("Failed to find 'recv Status-Server' section");
request->reply->code = FR_CODE_ACCESS_REJECT;
goto send_reply;
}
RDEBUG("Running 'recv Status-Server' from file %s", cf_filename(unlang));
unlang_interpret_push_section(request, unlang, RLM_MODULE_NOOP, UNLANG_TOP_FRAME);
request->request_state = REQUEST_RECV;
/* FALL-THROUGH */
case REQUEST_RECV:
rcode = unlang_interpret_resume(request);
if (request->master_state == REQUEST_STOP_PROCESSING) return FR_IO_DONE;
if (rcode == RLM_MODULE_YIELD) return FR_IO_YIELD;
rad_assert(request->log.unlang_indent == 0);
switch (rcode) {
case RLM_MODULE_OK:
case RLM_MODULE_UPDATED:
request->reply->code = FR_CODE_ACCESS_ACCEPT;
break;
case RLM_MODULE_FAIL:
case RLM_MODULE_HANDLED:
request->reply->code = 0; /* don't reply */
break;
default:
case RLM_MODULE_REJECT:
request->reply->code = FR_CODE_ACCESS_REJECT;
break;
}
/*
* Allow for over-ride of reply code.
*/
vp = fr_pair_find_by_da(request->reply->vps, attr_packet_type, TAG_ANY);
if (vp) request->reply->code = vp->vp_uint32;
dv = fr_dict_enum_by_value(attr_packet_type, fr_box_uint32(request->reply->code));
unlang = NULL;
if (dv) unlang = cf_section_find(request->server_cs, "send", dv->alias);
if (!unlang) goto send_reply;
rerun_nak:
RDEBUG("Running 'send %s' from file %s", cf_section_name2(unlang), cf_filename(unlang));
unlang_interpret_push_section(request, unlang, RLM_MODULE_NOOP, UNLANG_TOP_FRAME);
request->request_state = REQUEST_SEND;
/* FALL-THROUGH */
case REQUEST_SEND:
rcode = unlang_interpret_resume(request);
if (request->master_state == REQUEST_STOP_PROCESSING) return FR_IO_DONE;
if (rcode == RLM_MODULE_YIELD) return FR_IO_YIELD;
rad_assert(request->log.unlang_indent == 0);
switch (rcode) {
case RLM_MODULE_NOOP:
case RLM_MODULE_OK:
case RLM_MODULE_UPDATED:
case RLM_MODULE_HANDLED:
/* reply is already set */
break;
default:
/*
* If we over-ride an ACK with a NAK, run
* the NAK section.
*/
if (request->reply->code != FR_CODE_ACCESS_REJECT) {
dv = fr_dict_enum_by_value(attr_packet_type, fr_box_uint32(request->reply->code));
RWDEBUG("Failed running 'send %s', trying 'send Access-Reject'", dv->alias);
request->reply->code = FR_CODE_ACCESS_REJECT;
dv = fr_dict_enum_by_value(attr_packet_type, fr_box_uint32(request->reply->code));
unlang = NULL;
if (!dv) goto send_reply;
unlang = cf_section_find(request->server_cs, "send", dv->alias);
if (unlang) goto rerun_nak;
RWDEBUG("Not running 'send %s' section as it does not exist", dv->alias);
}
break;
}
send_reply:
gettimeofday(&request->reply->timestamp, NULL);
/*
* Check for "do not respond".
*/
if (request->reply->code == FR_CODE_DO_NOT_RESPOND) {
RDEBUG("Not sending reply to client.");
break;
}
if (request->parent && RDEBUG_ENABLED) {
RDEBUG("Sending %s ID %i", fr_packet_codes[request->reply->code], request->reply->id);
log_request_pair_list(L_DBG_LVL_1, request, request->reply->vps, "");
}
break;
default:
return FR_IO_FAIL;
}
return FR_IO_REPLY;
}
/*
* build a reply to be sent.
*/
static int eap_sim_compose(eap_session_t *eap_session, uint8_t const *hmac_extra, size_t hmac_extra_len)
{
eap_sim_session_t *eap_sim_session = talloc_get_type_abort(eap_session->opaque, eap_sim_session_t);
fr_cursor_t cursor;
fr_cursor_t to_encode;
VALUE_PAIR *head = NULL, *vp;
REQUEST *request = eap_session->request;
fr_sim_encode_ctx_t encoder_ctx = {
.root = fr_dict_root(dict_eap_sim),
.keys = &eap_sim_session->keys,
.iv = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 },
.iv_included = false,
.hmac_md = EVP_sha1(),
.eap_packet = eap_session->this_round->request,
.hmac_extra = hmac_extra,
.hmac_extra_len = hmac_extra_len
};
ssize_t ret;
/* we will set the ID on requests, since we have to HMAC it */
eap_session->this_round->set_request_id = true;
fr_cursor_init(&cursor, &eap_session->request->reply->vps);
fr_cursor_init(&to_encode, &head);
while ((vp = fr_cursor_current(&cursor))) {
if (!fr_dict_parent_common(fr_dict_root(dict_eap_sim), vp->da, true)) {
fr_cursor_next(&cursor);
continue;
}
vp = fr_cursor_remove(&cursor);
/*
* Silently discard encrypted attributes until
* the peer should have k_encr. These can be
* added by policy, and seem to cause
* wpa_supplicant to fail if sent before the challenge.
*/
if (!eap_sim_session->allow_encrypted && fr_dict_parent_common(attr_eap_sim_encr_data, vp->da, true)) {
RWDEBUG("Silently discarding &reply:%s: Encrypted attributes not allowed in this round",
vp->da->name);
talloc_free(vp);
continue;
}
fr_cursor_append(&to_encode, vp);
}
RDEBUG2("Encoding EAP-SIM attributes");
log_request_pair_list(L_DBG_LVL_2, request, head, NULL);
eap_session->this_round->request->type.num = FR_EAP_SIM;
eap_session->this_round->request->id = eap_sim_session->sim_id++ & 0xff;
eap_session->this_round->set_request_id = true;
ret = fr_sim_encode(eap_session->request, head, &encoder_ctx);
fr_cursor_head(&to_encode);
fr_cursor_free_list(&to_encode);
if (ret < 0) {
RPEDEBUG("Failed encoding EAP-SIM data");
return -1;
}
return 0;
}
static int eap_sim_send_start(eap_session_t *eap_session)
{
REQUEST *request = eap_session->request;
VALUE_PAIR **vps, *vp;
uint16_t version;
eap_sim_session_t *eap_sim_session = talloc_get_type_abort(eap_session->opaque, eap_sim_session_t);
RADIUS_PACKET *packet;
rad_assert(eap_session->request != NULL);
rad_assert(eap_session->request->reply);
RDEBUG2("Sending SIM-State");
eap_session->this_round->request->code = FR_EAP_CODE_REQUEST;
eap_sim_session->allow_encrypted = false; /* In case this is after failed fast-resumption */
/* these are the outgoing attributes */
packet = eap_session->request->reply;
vps = &packet->vps;
rad_assert(vps != NULL);
/*
* Add appropriate TLVs for the EAP things we wish to send.
*/
vp = fr_pair_afrom_da(packet, attr_eap_sim_version_list);
vp->vp_uint16 = EAP_SIM_VERSION;
fr_pair_add(vps, vp);
/* record it in the ess */
version = htons(EAP_SIM_VERSION);
memcpy(eap_sim_session->keys.gsm.version_list, &version, sizeof(version));
eap_sim_session->keys.gsm.version_list_len = 2;
/*
* Select the right type of identity request attribute
*/
switch (eap_sim_session->id_req) {
case SIM_ANY_ID_REQ:
vp = fr_pair_afrom_da(packet, attr_eap_sim_any_id_req);
break;
case SIM_PERMANENT_ID_REQ:
vp = fr_pair_afrom_da(packet, attr_eap_sim_permanent_id_req);
break;
case SIM_FULLAUTH_ID_REQ:
vp = fr_pair_afrom_da(packet, attr_eap_sim_fullauth_id_req);
break;
default:
rad_assert(0);
}
vp->vp_bool = true;
fr_pair_replace(vps, vp);
/* the SUBTYPE, set to start. */
vp = fr_pair_afrom_da(packet, attr_eap_sim_subtype);
vp->vp_uint16 = EAP_SIM_START;
fr_pair_replace(vps, vp);
/*
* Encode the packet
*/
if (eap_sim_compose(eap_session, NULL, 0) < 0) {
fr_pair_list_free(&packet->vps);
return -1;
}
return 0;
}
/** Process the Peer's response and advantage the state machine
*
*/
static rlm_rcode_t mod_process(UNUSED void *instance, eap_session_t *eap_session)
{
REQUEST *request = eap_session->request;
eap_aka_session_t *eap_aka_session = talloc_get_type_abort(eap_session->opaque, eap_aka_session_t);
fr_sim_decode_ctx_t ctx = {
.keys = &eap_aka_session->keys,
};
VALUE_PAIR *vp, *vps, *subtype_vp;
fr_cursor_t cursor;
eap_aka_subtype_t subtype;
int ret;
/*
* RFC 4187 says we ignore the contents of the
* next packet after we send our success notification
* and always send a success.
*/
if (eap_aka_session->state == EAP_AKA_SERVER_SUCCESS_NOTIFICATION) {
eap_aka_state_enter(eap_session, EAP_AKA_SERVER_SUCCESS);
return RLM_MODULE_HANDLED;
}
/* vps is the data from the client */
vps = request->packet->vps;
fr_cursor_init(&cursor, &request->packet->vps);
fr_cursor_tail(&cursor);
ret = fr_sim_decode(eap_session->request,
&cursor,
dict_eap_aka,
eap_session->this_round->response->type.data,
eap_session->this_round->response->type.length,
&ctx);
/*
* RFC 4187 says we *MUST* notify, not just
* send an EAP-Failure in this case where
* we cannot decode an EAP-AKA packet.
*/
if (ret < 0) {
RPEDEBUG2("Failed decoding EAP-AKA attributes");
eap_aka_state_enter(eap_session, EAP_AKA_SERVER_FAILURE_NOTIFICATION);
return RLM_MODULE_HANDLED; /* We need to process more packets */
}
vp = fr_cursor_current(&cursor);
if (vp && RDEBUG_ENABLED2) {
RDEBUG2("EAP-AKA decoded attributes");
log_request_pair_list(L_DBG_LVL_2, request, vp, NULL);
}
subtype_vp = fr_pair_find_by_da(vps, attr_eap_aka_subtype, TAG_ANY);
if (!subtype_vp) {
REDEBUG("Missing EAP-AKA-Subtype");
eap_aka_state_enter(eap_session, EAP_AKA_SERVER_FAILURE_NOTIFICATION);
return RLM_MODULE_HANDLED; /* We need to process more packets */
}
subtype = subtype_vp->vp_uint16;
switch (eap_aka_session->state) {
/*
* Here we expected the peer to send
* us identities for validation.
*/
case EAP_AKA_SERVER_IDENTITY:
switch (subtype) {
case EAP_AKA_IDENTITY:
if (process_eap_aka_identity(eap_session, vps) == 0) return RLM_MODULE_HANDLED;
eap_aka_state_enter(eap_session, EAP_AKA_SERVER_FAILURE_NOTIFICATION);
return RLM_MODULE_HANDLED; /* We need to process more packets */
/*
* Case 1 where we're allowed to send an EAP-Failure
*
* This can happen in the case of a conservative
* peer, where it refuses to provide the permanent
* identity.
*/
case EAP_AKA_CLIENT_ERROR:
{
char buff[20];
vp = fr_pair_find_by_da(vps, attr_eap_aka_client_error_code, TAG_ANY);
if (!vp) {
REDEBUG("EAP-AKA Peer rejected AKA-Identity (%s) with client-error message but "
"has not supplied a client error code",
fr_int2str(sim_id_request_table, eap_aka_session->id_req, "<INVALID>"));
} else {
REDEBUG("Client rejected AKA-Identity (%s) with error: %s (%i)",
fr_int2str(sim_id_request_table, eap_aka_session->id_req, "<INVALID>"),
fr_pair_value_enum(vp, buff), vp->vp_uint16);
}
eap_aka_state_enter(eap_session, EAP_AKA_SERVER_FAILURE);
return RLM_MODULE_REJECT;
}
case EAP_AKA_NOTIFICATION:
notification:
{
char buff[20];
vp = fr_pair_afrom_da(vps, attr_eap_aka_notification);
if (!vp) {
REDEBUG2("Received AKA-Notification with no notification code");
eap_aka_state_enter(eap_session, EAP_AKA_SERVER_FAILURE_NOTIFICATION);
return RLM_MODULE_HANDLED; /* We need to process more packets */
}
/*
* Case 3 where we're allowed to send an EAP-Failure
*/
if (!(vp->vp_uint16 & 0x8000)) {
REDEBUG2("AKA-Notification %s (%i) indicates failure", fr_pair_value_enum(vp, buff),
vp->vp_uint16);
eap_aka_state_enter(eap_session, EAP_AKA_SERVER_FAILURE);
return RLM_MODULE_REJECT;
}
/*
* ...if it's not a failure, then re-enter the
* current state.
*/
REDEBUG2("Got AKA-Notification %s (%i)", fr_pair_value_enum(vp, buff), vp->vp_uint16);
eap_aka_state_enter(eap_session, eap_aka_session->state);
return RLM_MODULE_HANDLED;
}
default:
unexpected_subtype:
/*
* RFC 4187 says we *MUST* notify, not just
* send an EAP-Failure in this case.
*/
REDEBUG("Unexpected subtype %pV", &subtype_vp->data);
eap_aka_state_enter(eap_session, EAP_AKA_SERVER_FAILURE_NOTIFICATION);
return RLM_MODULE_HANDLED; /* We need to process more packets */
}
/*
* Process the response to our previous challenge.
*/
case EAP_AKA_SERVER_CHALLENGE:
switch (subtype) {
case EAP_AKA_CHALLENGE:
switch (process_eap_aka_challenge(eap_session, vps)) {
case 1:
return RLM_MODULE_HANDLED;
case 0:
return RLM_MODULE_OK;
case -1:
eap_aka_state_enter(eap_session, EAP_AKA_SERVER_FAILURE_NOTIFICATION);
return RLM_MODULE_HANDLED; /* We need to process more packets */
}
case EAP_AKA_SYNCHRONIZATION_FAILURE:
REDEBUG("EAP-AKA Peer synchronization failure"); /* We can't handle these yet */
eap_aka_state_enter(eap_session, EAP_AKA_SERVER_FAILURE_NOTIFICATION);
return RLM_MODULE_HANDLED; /* We need to process more packets */
/*
* Case 1 where we're allowed to send an EAP-Failure
*/
case EAP_AKA_CLIENT_ERROR:
{
char buff[20];
vp = fr_pair_find_by_da(vps, attr_eap_aka_client_error_code, TAG_ANY);
if (!vp) {
REDEBUG("EAP-AKA Peer rejected AKA-Challenge with client-error message but "
"has not supplied a client error code");
} else {
REDEBUG("Client rejected AKA-Challenge with error: %s (%i)",
fr_pair_value_enum(vp, buff), vp->vp_uint16);
}
eap_aka_state_enter(eap_session, EAP_AKA_SERVER_FAILURE);
return RLM_MODULE_REJECT;
}
/*
* Case 2 where we're allowed to send an EAP-Failure
*/
case EAP_AKA_AUTHENTICATION_REJECT:
REDEBUG("EAP-AKA Peer Rejected AUTN");
eap_aka_state_enter(eap_session, EAP_AKA_SERVER_FAILURE);
return RLM_MODULE_REJECT;
case EAP_AKA_NOTIFICATION:
goto notification;
default:
goto unexpected_subtype;
}
/*
* Peer acked our failure
*/
case EAP_AKA_SERVER_FAILURE_NOTIFICATION:
switch (subtype) {
case EAP_AKA_NOTIFICATION:
RDEBUG2("AKA-Notification ACKed, sending EAP-Failure");
eap_aka_state_enter(eap_session, EAP_AKA_SERVER_FAILURE);
return RLM_MODULE_REJECT;
default:
goto unexpected_subtype;
}
/*
* Something bad happened...
*/
default:
rad_assert(0);
eap_aka_state_enter(eap_session, EAP_AKA_SERVER_FAILURE_NOTIFICATION);
return RLM_MODULE_HANDLED; /* We need to process more packets */
}
}
/** Initiate the EAP-SIM session by starting the state machine
*
*/
static rlm_rcode_t mod_session_init(void *instance, eap_session_t *eap_session)
{
REQUEST *request = eap_session->request;
eap_aka_session_t *eap_aka_session;
rlm_eap_aka_t *inst = instance;
fr_sim_id_type_t type;
fr_sim_method_hint_t method;
MEM(eap_aka_session = talloc_zero(eap_session, eap_aka_session_t));
eap_session->opaque = eap_aka_session;
/*
* Set default configuration, we may allow these
* to be toggled by attributes later.
*/
eap_aka_session->request_identity = inst->request_identity;
eap_aka_session->send_result_ind = inst->protected_success;
eap_aka_session->id_req = SIM_NO_ID_REQ; /* Set the default */
/*
* This value doesn't have be strong, but it is
* good if it is different now and then.
*/
eap_aka_session->aka_id = (fr_rand() & 0xff);
/*
* Process the identity that we received in the
* EAP-Identity-Response and use it to determine
* the initial request we send to the Supplicant.
*/
if (fr_sim_id_type(&type, &method,
eap_session->identity, talloc_array_length(eap_session->identity) - 1) < 0) {
RPWDEBUG2("Failed parsing identity, continuing anyway");
}
/*
* Unless AKA-Prime is explicitly disabled,
* use it... It has stronger keying, and
* binds authentication to the network.
*/
switch (eap_session->type) {
case FR_EAP_AKA_PRIME:
default:
RDEBUG2("New EAP-AKA' session");
eap_aka_session->type = FR_EAP_AKA_PRIME;
eap_aka_session->kdf = FR_EAP_AKA_KDF_VALUE_EAP_AKA_PRIME_WITH_CK_PRIME_IK_PRIME;
eap_aka_session->checkcode_md = eap_aka_session->mac_md = EVP_sha256();
eap_aka_session->keys.network = (uint8_t *)talloc_bstrndup(eap_aka_session, inst->network_name,
talloc_array_length(inst->network_name) - 1);
eap_aka_session->keys.network_len = talloc_array_length(eap_aka_session->keys.network) - 1;
switch (method) {
default:
RWDEBUG("EAP-Identity-Response hints that EAP-%s should be started, but we're "
"attempting EAP-AKA'", fr_int2str(sim_id_method_hint_table, method, "<INVALID>"));
break;
case SIM_METHOD_HINT_AKA_PRIME:
case SIM_METHOD_HINT_UNKNOWN:
break;
}
break;
case FR_EAP_AKA:
RDEBUG2("New EAP-AKA session");
eap_aka_session->type = FR_EAP_AKA;
eap_aka_session->kdf = FR_EAP_AKA_KDF_VALUE_EAP_AKA; /* Not actually sent */
eap_aka_session->checkcode_md = eap_aka_session->mac_md = EVP_sha1();
eap_aka_session->send_at_bidding = true;
switch (method) {
default:
RWDEBUG("EAP-Identity-Response hints that EAP-%s should be started, but we're "
"attempting EAP-AKA", fr_int2str(sim_id_method_hint_table, method, "<INVALID>"));
break;
case SIM_METHOD_HINT_AKA:
case SIM_METHOD_HINT_UNKNOWN:
break;
}
break;
}
eap_session->process = mod_process;
/*
* Admin wants us to always request an identity
* initially. The RFC says this is also the
* better way to operate, as the supplicant
* can 'decorate' the identity in the identity
* response.
*/
if (inst->request_identity) {
request_id:
/*
* We always start by requesting
* any ID initially as we can
* always negotiate down.
*/
eap_aka_session->id_req = SIM_ANY_ID_REQ;
eap_aka_state_enter(eap_session, EAP_AKA_SERVER_IDENTITY);
return RLM_MODULE_HANDLED;
}
/*
* Figure out what type of identity we have
* and use it to determine the initial
* request we send.
*/
switch (type) {
/*
* If there's no valid tag on the identity
* then it's probably been decorated by the
* supplicant.
*
* Request the unmolested identity
*/
case SIM_ID_TYPE_UNKNOWN:
RWDEBUG("Identity format unknown, sending Identity request");
goto request_id;
/*
* These types need to be transformed into something
* usable before we can do anything.
*/
case SIM_ID_TYPE_PSEUDONYM:
case SIM_ID_TYPE_FASTAUTH:
/*
* Permanent ID means we can just send the challenge
*/
case SIM_ID_TYPE_PERMANENT:
eap_aka_session->keys.identity_len = talloc_array_length(eap_session->identity) - 1;
MEM(eap_aka_session->keys.identity = talloc_memdup(eap_aka_session, eap_session->identity,
eap_aka_session->keys.identity_len));
eap_aka_state_enter(eap_session, EAP_AKA_SERVER_CHALLENGE);
return RLM_MODULE_HANDLED;
}
return RLM_MODULE_HANDLED;
}
static int eap_aka_compose(eap_session_t *eap_session)
{
eap_aka_session_t *eap_aka_session = talloc_get_type_abort(eap_session->opaque, eap_aka_session_t);
fr_cursor_t cursor;
fr_cursor_t to_encode;
VALUE_PAIR *head = NULL, *vp;
REQUEST *request = eap_session->request;
ssize_t ret;
fr_sim_encode_ctx_t encoder_ctx = {
.root = fr_dict_root(dict_eap_aka),
.keys = &eap_aka_session->keys,
.iv = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 },
.iv_included = false,
.hmac_md = eap_aka_session->mac_md,
.eap_packet = eap_session->this_round->request,
.hmac_extra = NULL,
.hmac_extra_len = 0
};
fr_cursor_init(&cursor, &eap_session->request->reply->vps);
fr_cursor_init(&to_encode, &head);
while ((vp = fr_cursor_current(&cursor))) {
if (!fr_dict_parent_common(encoder_ctx.root, vp->da, true)) {
fr_cursor_next(&cursor);
continue;
}
vp = fr_cursor_remove(&cursor);
/*
* Silently discard encrypted attributes until
* the peer should have k_encr. These can be
* added by policy, and seem to cause
* wpa_supplicant to fail if sent before the challenge.
*/
if (!eap_aka_session->allow_encrypted && fr_dict_parent_common(attr_eap_aka_encr_data, vp->da, true)) {
RWDEBUG("Silently discarding &reply:%s: Encrypted attributes not allowed in this round",
vp->da->name);
talloc_free(vp);
continue;
}
fr_cursor_append(&to_encode, vp);
}
RDEBUG2("Encoding EAP-AKA attributes");
log_request_pair_list(L_DBG_LVL_2, request, head, NULL);
eap_session->this_round->request->type.num = eap_aka_session->type;
eap_session->this_round->request->id = eap_aka_session->aka_id++ & 0xff;
eap_session->this_round->set_request_id = true;
ret = fr_sim_encode(eap_session->request, head, &encoder_ctx);
fr_cursor_head(&to_encode);
fr_cursor_free_list(&to_encode);
if (ret < 0) {
RPEDEBUG("Failed encoding EAP-AKA data");
return -1;
}
return 0;
}
/** Send an EAP-AKA identity request to the supplicant
*
* There are three types of user identities that can be implemented
* - Permanent identities such as [email protected]
* Permanent identities can be identified by the leading zero followed by
* by 15 digits (the IMSI number).
* - Ephemeral identities (pseudonyms). These are identities assigned for
* identity privacy so the user can't be tracked. These can identities
* can either be generated as per the 3GPP 'Security aspects of non-3GPP accesses'
* document section 14, where a set of up to 16 encryption keys are used
* to reversibly encrypt the IMSI. Alternatively the pseudonym can be completely
* randomised and stored in a datastore.
* - A fast resumption ID which resolves to data used for fast resumption.
*
* In order to perform full authentication the original IMSI is required for
* forwarding to the HLR. In the case where we can't match/decrypt the pseudonym,
* or can't perform fast resumption, we need to request the full identity from
* the supplicant.
*
* @param[in] eap_session to continue.
* @return
* - 0 on success.
* - <0 on failure.
*/
static int eap_aka_send_identity_request(eap_session_t *eap_session)
{
REQUEST *request = eap_session->request;
eap_aka_session_t *eap_aka_session = talloc_get_type_abort(eap_session->opaque, eap_aka_session_t);
VALUE_PAIR *vp;
RADIUS_PACKET *packet;
fr_cursor_t cursor;
RDEBUG2("Sending AKA-Identity (%s)", fr_int2str(sim_id_request_table, eap_aka_session->id_req, "<INVALID>"));
eap_session->this_round->request->code = FR_EAP_CODE_REQUEST;
eap_aka_session->allow_encrypted = false; /* In case this is after failed fast-resumption */
packet = request->reply;
fr_cursor_init(&cursor, &packet->vps);
/*
* Set the subtype to identity request
*/
vp = fr_pair_afrom_da(packet, attr_eap_aka_subtype);
vp->vp_uint16 = FR_EAP_AKA_SUBTYPE_VALUE_AKA_IDENTITY;
fr_cursor_append(&cursor, vp);
/*
* Select the right type of identity request attribute
*/
switch (eap_aka_session->id_req) {
case SIM_ANY_ID_REQ:
vp = fr_pair_afrom_da(packet, attr_eap_aka_any_id_req);
break;
case SIM_PERMANENT_ID_REQ:
vp = fr_pair_afrom_da(packet, attr_eap_aka_permanent_id_req);
break;
case SIM_FULLAUTH_ID_REQ:
vp = fr_pair_afrom_da(packet, attr_eap_aka_fullauth_id_req);
break;
default:
rad_assert(0);
}
vp->vp_bool = true;
fr_cursor_append(&cursor, vp);
/*
* Encode the packet
*/
if (eap_aka_compose(eap_session) < 0) {
failure:
fr_pair_list_free(&packet->vps);
return -1;
}
/*
* Digest the packet contents, updating our checkcode.
*/
if (!eap_aka_session->checkcode_state &&
fr_sim_crypto_init_checkcode(eap_aka_session, &eap_aka_session->checkcode_state,
eap_aka_session->checkcode_md) < 0) {
RPEDEBUG("Failed initialising checkcode");
goto failure;
}
if (fr_sim_crypto_update_checkcode(eap_aka_session->checkcode_state, eap_session->this_round->request) < 0) {
RPEDEBUG("Failed updating checkcode");
goto failure;
}
return 0;
}
static fr_io_final_t mod_process(UNUSED void const *instance, REQUEST *request, fr_io_action_t action)
{
rlm_rcode_t rcode;
CONF_SECTION *unlang;
REQUEST_VERIFY(request);
/*
* Pass this through asynchronously to the module which
* is waiting for something to happen.
*/
if (action != FR_IO_ACTION_RUN) {
unlang_signal(request, (fr_state_signal_t) action);
return FR_IO_DONE;
}
switch (request->request_state) {
case REQUEST_INIT:
RDEBUG("Received %s ID %i", fr_vmps_codes[request->packet->code], request->packet->id);
log_request_proto_pair_list(L_DBG_LVL_1, request, request->packet->vps, "");
request->component = "vmps";
unlang = cf_section_find(request->server_cs, "new", "client");
if (!unlang) {
RWDEBUG("Failed to find 'new client' section");
request->reply->code = CLIENT_NAK;
goto send_reply;
}
RDEBUG("Running 'new client' from file %s", cf_filename(unlang));
unlang_push_section(request, unlang, RLM_MODULE_NOOP, UNLANG_TOP_FRAME);
request->request_state = REQUEST_RECV;
/* FALL-THROUGH */
case REQUEST_RECV:
rcode = unlang_interpret_resume(request);
if (request->master_state == REQUEST_STOP_PROCESSING) return FR_IO_DONE;
if (rcode == RLM_MODULE_YIELD) return FR_IO_YIELD;
rad_assert(request->log.unlang_indent == 0);
switch (rcode) {
case RLM_MODULE_OK:
case RLM_MODULE_UPDATED:
request->reply->code = CLIENT_ADD;
break;
case RLM_MODULE_FAIL:
case RLM_MODULE_HANDLED:
request->reply->code = 0; /* don't reply */
break;
default:
case RLM_MODULE_REJECT:
request->reply->code = CLIENT_NAK;
break;
}
unlang = cf_section_find(request->server_cs, "add", "client");
if (!unlang) goto send_reply;
rerun_nak:
RDEBUG("Running '%s client' from file %s", cf_section_name1(unlang), cf_filename(unlang));
unlang_push_section(request, unlang, RLM_MODULE_NOOP, UNLANG_TOP_FRAME);
request->request_state = REQUEST_SEND;
/* FALL-THROUGH */
case REQUEST_SEND:
rcode = unlang_interpret_resume(request);
if (request->master_state == REQUEST_STOP_PROCESSING) return FR_IO_DONE;
if (rcode == RLM_MODULE_YIELD) return FR_IO_YIELD;
rad_assert(request->log.unlang_indent == 0);
switch (rcode) {
case RLM_MODULE_NOOP:
case RLM_MODULE_OK:
case RLM_MODULE_UPDATED:
case RLM_MODULE_HANDLED:
/* reply is already set */
break;
default:
/*
* If we over-ride an ACK with a NAK, run
* the NAK section.
*/
if (request->reply->code != 257) {
RWDEBUG("Failed running 'add client', trying 'deny client'.");
deny:
request->reply->code = CLIENT_NAK;
unlang = cf_section_find(request->server_cs, "deny", "client");
if (unlang) goto rerun_nak;
RWDEBUG("Not running 'deny client' section as it does not exist");
}
break;
}
if (request->reply->code == CLIENT_ADD) {
VALUE_PAIR *vp;
vp = fr_pair_find_by_da(request->control, attr_freeradius_client_ip_address, TAG_ANY);
if (!vp) fr_pair_find_by_da(request->control, attr_freeradius_client_ipv6_address, TAG_ANY);
if (!vp) fr_pair_find_by_da(request->control, attr_freeradius_client_ip_prefix, TAG_ANY);
if (!vp) fr_pair_find_by_da(request->control, attr_freeradius_client_ipv6_prefix, TAG_ANY);
if (!vp) {
ERROR("The 'control' list MUST contain a FreeRADIUS-Client.. IP address attribute");
goto deny;
}
}
send_reply:
/*
* This is an internally generated request. Don't print IP addresses.
*/
if (request->reply->code == CLIENT_ADD) {
RDEBUG("Adding client");
} else {
RDEBUG("Denying client");
}
if (RDEBUG_ENABLED) log_request_pair_list(L_DBG_LVL_1, request, request->reply->vps, NULL);
break;
default:
return FR_IO_FAIL;
}
return FR_IO_REPLY;
}
static fr_io_final_t mod_process(UNUSED void const *instance, REQUEST *request, fr_io_action_t action)
{
VALUE_PAIR *vp;
rlm_rcode_t rcode;
CONF_SECTION *unlang;
REQUEST_VERIFY(request);
/*
* Pass this through asynchronously to the module which
* is waiting for something to happen.
*/
if (action != FR_IO_ACTION_RUN) {
unlang_signal(request, (fr_state_signal_t) action);
return FR_IO_DONE;
}
switch (request->request_state) {
case REQUEST_INIT:
RDEBUG("Received %s ID %i",
fr_dict_enum_alias_by_value(attr_packet_type, fr_box_uint32(request->reply->code)),
request->packet->id);
log_request_pair_list(L_DBG_LVL_1, request, request->packet->vps, "");
request->component = "radius";
unlang = cf_section_find(request->server_cs, "recv", NULL);
if (!unlang) {
REDEBUG("Failed to find 'recv' section");
return FR_IO_FAIL;
}
RDEBUG("Running 'recv' from file %s", cf_filename(unlang));
unlang_push_section(request, unlang, RLM_MODULE_NOOP, UNLANG_TOP_FRAME);
request->request_state = REQUEST_RECV;
/* FALL-THROUGH */
case REQUEST_RECV:
rcode = unlang_interpret_continue(request);
if (request->master_state == REQUEST_STOP_PROCESSING) return FR_IO_DONE;
if (rcode == RLM_MODULE_YIELD) return FR_IO_YIELD;
rad_assert(request->log.unlang_indent == 0);
switch (rcode) {
/*
* The module has a number of OK return codes.
*/
case RLM_MODULE_OK:
case RLM_MODULE_UPDATED:
switch (request->packet->code) {
case FR_CODE_ACCOUNTING_REQUEST:
request->reply->code = FR_CODE_ACCOUNTING_RESPONSE;
break;
case FR_CODE_COA_REQUEST:
request->reply->code = FR_CODE_COA_ACK;
break;
case FR_CODE_DISCONNECT_REQUEST:
request->reply->code = FR_CODE_DISCONNECT_ACK;
break;
default:
request->reply->code = 0;
break;
}
break;
case RLM_MODULE_HANDLED:
break;
/*
* The module failed, or said the request is
* invalid, therefore we stop here.
*/
case RLM_MODULE_NOOP:
case RLM_MODULE_FAIL:
case RLM_MODULE_INVALID:
case RLM_MODULE_NOTFOUND:
case RLM_MODULE_REJECT:
case RLM_MODULE_USERLOCK:
default:
request->reply->code = 0;
break;
}
/*
* Allow for over-ride of reply code.
*/
vp = fr_pair_find_by_da(request->reply->vps, attr_packet_type, TAG_ANY);
if (vp) request->reply->code = vp->vp_uint32;
if (request->reply->code == FR_CODE_DO_NOT_RESPOND) {
RWARN("Ignoring 'do_not_respond' as it does not apply to detail files");
}
unlang = cf_section_find(request->server_cs, "send", "ok");
if (!unlang) goto send_reply;
RDEBUG("Running 'send %s { ... }' from file %s", cf_section_name2(unlang), cf_filename(unlang));
unlang_push_section(request, unlang, RLM_MODULE_NOOP, UNLANG_TOP_FRAME);
request->request_state = REQUEST_SEND;
/* FALL-THROUGH */
case REQUEST_SEND:
rcode = unlang_interpret_continue(request);
if (request->master_state == REQUEST_STOP_PROCESSING) return FR_IO_DONE;
if (rcode == RLM_MODULE_YIELD) return FR_IO_YIELD;
rad_assert(request->log.unlang_indent == 0);
switch (rcode) {
case RLM_MODULE_NOOP:
case RLM_MODULE_OK:
case RLM_MODULE_UPDATED:
case RLM_MODULE_HANDLED:
/* reply is already set */
break;
default:
request->reply->code = 0;
break;
}
send_reply:
/*
* Failed, but we still reply with a magic code,
* so that the reader can retransmit.
*/
if (!request->reply->code) {
REDEBUG("Failed ID %i", request->reply->id);
} else {
RDEBUG("Sent %s ID %i",
fr_dict_enum_alias_by_value(attr_packet_type, fr_box_uint32(request->reply->code)),
request->reply->id);
}
log_request_proto_pair_list(L_DBG_LVL_1, request, request->reply->vps, "");
break;
default:
return FR_IO_FAIL;
}
return FR_IO_REPLY;
}
