/*
* compose EAP reply packet in EAP-Message attr of RADIUS. If
* EAP exceeds 253, frame it in multiple EAP-Message attrs.
*/
int eap_basic_compose(RADIUS_PACKET *packet, eap_packet_t *reply)
{
VALUE_PAIR *vp;
eap_packet_raw_t *eap_packet;
int rcode;
if (eap_wireformat(reply) == EAP_INVALID) {
return RLM_MODULE_INVALID;
}
eap_packet = (eap_packet_raw_t *)reply->packet;
fr_pair_delete_by_num(&(packet->vps), 0, PW_EAP_MESSAGE, TAG_ANY);
vp = eap_packet2vp(packet, eap_packet);
if (!vp) return RLM_MODULE_INVALID;
fr_pair_add(&(packet->vps), vp);
/*
* EAP-Message is always associated with
* Message-Authenticator but not vice-versa.
*
* Don't add a Message-Authenticator if it's already
* there.
*/
vp = fr_pair_find_by_num(packet->vps, 0, PW_MESSAGE_AUTHENTICATOR, TAG_ANY);
if (!vp) {
vp = fr_pair_afrom_num(packet, 0, PW_MESSAGE_AUTHENTICATOR);
vp->vp_length = AUTH_VECTOR_LEN;
vp->vp_octets = talloc_zero_array(vp, uint8_t, vp->vp_length);
fr_pair_add(&(packet->vps), vp);
}
/* Set request reply code, but only if it's not already set. */
rcode = RLM_MODULE_OK;
if (!packet->code) switch (reply->code) {
case PW_EAP_RESPONSE:
case PW_EAP_SUCCESS:
packet->code = PW_CODE_ACCESS_ACCEPT;
rcode = RLM_MODULE_HANDLED;
break;
case PW_EAP_FAILURE:
packet->code = PW_CODE_ACCESS_REJECT;
rcode = RLM_MODULE_REJECT;
break;
case PW_EAP_REQUEST:
packet->code = PW_CODE_ACCESS_CHALLENGE;
rcode = RLM_MODULE_HANDLED;
break;
default:
/* Should never enter here */
ERROR("rlm_eap: reply code %d is unknown, Rejecting the request.", reply->code);
packet->code = PW_CODE_ACCESS_REJECT;
break;
}
return rcode;
}
static int mschapv1_encode(RADIUS_PACKET *packet, VALUE_PAIR **request,
char const *password)
{
unsigned int i;
uint8_t *p;
VALUE_PAIR *challenge, *reply;
uint8_t nthash[16];
fr_pair_delete_by_num(&packet->vps, PW_MSCHAP_CHALLENGE, VENDORPEC_MICROSOFT, TAG_ANY);
fr_pair_delete_by_num(&packet->vps, PW_MSCHAP_RESPONSE, VENDORPEC_MICROSOFT, TAG_ANY);
challenge = fr_pair_afrom_num(packet, PW_MSCHAP_CHALLENGE, VENDORPEC_MICROSOFT);
if (!challenge) {
return 0;
}
fr_pair_add(request, challenge);
challenge->vp_length = 8;
challenge->vp_octets = p = talloc_array(challenge, uint8_t, challenge->vp_length);
for (i = 0; i < challenge->vp_length; i++) {
p[i] = fr_rand();
}
reply = fr_pair_afrom_num(packet, PW_MSCHAP_RESPONSE, VENDORPEC_MICROSOFT);
if (!reply) {
return 0;
}
fr_pair_add(request, reply);
reply->vp_length = 50;
reply->vp_octets = p = talloc_array(reply, uint8_t, reply->vp_length);
memset(p, 0, reply->vp_length);
p[1] = 0x01; /* NT hash */
if (mschap_ntpwdhash(nthash, password) < 0) {
return 0;
}
smbdes_mschap(nthash, challenge->vp_octets, p + 26);
return 1;
}
VALUE_PAIR *eap_packet2vp(RADIUS_PACKET *packet, eap_packet_raw_t const *eap)
{
int total, size;
uint8_t const *ptr;
VALUE_PAIR *head = NULL;
VALUE_PAIR *vp;
vp_cursor_t out;
total = eap->length[0] * 256 + eap->length[1];
if (total == 0) {
DEBUG("Asked to encode empty EAP-Message!");
return NULL;
}
ptr = (uint8_t const *) eap;
fr_cursor_init(&out, &head);
do {
size = total;
if (size > 253) size = 253;
vp = fr_pair_afrom_num(packet, 0, PW_EAP_MESSAGE);
if (!vp) {
fr_pair_list_free(&head);
return NULL;
}
fr_pair_value_memcpy(vp, ptr, size);
fr_cursor_insert(&out, vp);
ptr += size;
total -= size;
} while (total > 0);
return head;
}
/*
* Actually generates EAP-Session-Id, which is an internal server
* attribute. Not all systems want to send EAP-Key-Nam
*/
void eaptls_gen_eap_key(RADIUS_PACKET *packet, SSL *s, uint32_t header)
{
VALUE_PAIR *vp;
uint8_t *p;
vp = fr_pair_afrom_num(packet, PW_EAP_SESSION_ID, 0);
if (!vp) return;
vp->vp_length = 1 + 2 * SSL3_RANDOM_SIZE;
p = talloc_array(vp, uint8_t, vp->vp_length);
p[0] = header & 0xff;
#ifdef HAVE_SSL_GET_CLIENT_RANDOM
SSL_get_client_random(s, p + 1, SSL3_RANDOM_SIZE);
SSL_get_server_random(s, p + 1 + SSL3_RANDOM_SIZE, SSL3_RANDOM_SIZE);
#else
memcpy(p + 1, s->s3->client_random, SSL3_RANDOM_SIZE);
memcpy(p + 1 + SSL3_RANDOM_SIZE,
s->s3->server_random, SSL3_RANDOM_SIZE);
#endif
vp->vp_octets = p;
fr_pair_add(&packet->vps, vp);
}
static int mod_process(void *arg, eap_handler_t *handler)
{
pwd_session_t *session;
pwd_hdr *hdr;
pwd_id_packet_t *packet;
eap_packet_t *response;
REQUEST *request, *fake;
VALUE_PAIR *pw, *vp;
EAP_DS *eap_ds;
size_t in_len;
int ret = 0;
eap_pwd_t *inst = (eap_pwd_t *)arg;
uint16_t offset;
uint8_t exch, *in, *ptr, msk[MSK_EMSK_LEN], emsk[MSK_EMSK_LEN];
uint8_t peer_confirm[SHA256_DIGEST_LENGTH];
if (((eap_ds = handler->eap_ds) == NULL) || !inst) return 0;
session = (pwd_session_t *)handler->opaque;
request = handler->request;
response = handler->eap_ds->response;
hdr = (pwd_hdr *)response->type.data;
/*
* The header must be at least one byte.
*/
if (!hdr || (response->type.length < sizeof(pwd_hdr))) {
RDEBUG("Packet with insufficient data");
return 0;
}
in = hdr->data;
in_len = response->type.length - sizeof(pwd_hdr);
/*
* see if we're fragmenting, if so continue until we're done
*/
if (session->out_pos) {
if (in_len) RDEBUG2("pwd got something more than an ACK for a fragment");
return send_pwd_request(session, eap_ds);
}
/*
* the first fragment will have a total length, make a
* buffer to hold all the fragments
*/
if (EAP_PWD_GET_LENGTH_BIT(hdr)) {
if (session->in) {
RDEBUG2("pwd already alloced buffer for fragments");
return 0;
}
if (in_len < 2) {
RDEBUG("Invalid packet: length bit set, but no length field");
return 0;
}
session->in_len = ntohs(in[0] * 256 | in[1]);
if ((session->in = talloc_zero_array(session, uint8_t, session->in_len)) == NULL) {
RDEBUG2("pwd cannot allocate %zd buffer to hold fragments",
session->in_len);
return 0;
}
memset(session->in, 0, session->in_len);
session->in_pos = 0;
in += sizeof(uint16_t);
in_len -= sizeof(uint16_t);
}
/*
* all fragments, including the 1st will have the M(ore) bit set,
* buffer those fragments!
*/
if (EAP_PWD_GET_MORE_BIT(hdr)) {
rad_assert(session->in != NULL);
if ((session->in_pos + in_len) > session->in_len) {
RDEBUG2("Fragment overflows packet.");
return 0;
}
memcpy(session->in + session->in_pos, in, in_len);
session->in_pos += in_len;
/*
* send back an ACK for this fragment
*/
exch = EAP_PWD_GET_EXCHANGE(hdr);
eap_ds->request->code = PW_EAP_REQUEST;
eap_ds->request->type.num = PW_EAP_PWD;
eap_ds->request->type.length = sizeof(pwd_hdr);
if ((eap_ds->request->type.data = talloc_array(eap_ds->request, uint8_t, sizeof(pwd_hdr))) == NULL) {
return 0;
}
hdr = (pwd_hdr *)eap_ds->request->type.data;
EAP_PWD_SET_EXCHANGE(hdr, exch);
return 1;
}
if (session->in) {
/*
* the last fragment...
*/
if ((session->in_pos + in_len) > session->in_len) {
RDEBUG2("pwd will not overflow a fragment buffer. Nope, not prudent");
return 0;
}
memcpy(session->in + session->in_pos, in, in_len);
in = session->in;
in_len = session->in_len;
}
switch (session->state) {
case PWD_STATE_ID_REQ:
{
BIGNUM *x = NULL, *y = NULL;
if (EAP_PWD_GET_EXCHANGE(hdr) != EAP_PWD_EXCH_ID) {
RDEBUG2("pwd exchange is incorrect: not ID");
return 0;
}
packet = (pwd_id_packet_t *) in;
if (in_len < sizeof(*packet)) {
RDEBUG("Packet is too small (%zd < %zd).", in_len, sizeof(*packet));
return 0;
}
if ((packet->prf != EAP_PWD_DEF_PRF) ||
(packet->random_function != EAP_PWD_DEF_RAND_FUN) ||
(packet->prep != EAP_PWD_PREP_NONE) ||
(CRYPTO_memcmp(packet->token, &session->token, 4)) ||
(packet->group_num != ntohs(session->group_num))) {
RDEBUG2("pwd id response is invalid");
return 0;
}
/*
* we've agreed on the ciphersuite, record it...
*/
ptr = (uint8_t *)&session->ciphersuite;
memcpy(ptr, (char *)&packet->group_num, sizeof(uint16_t));
ptr += sizeof(uint16_t);
*ptr = EAP_PWD_DEF_RAND_FUN;
ptr += sizeof(uint8_t);
*ptr = EAP_PWD_DEF_PRF;
session->peer_id_len = in_len - sizeof(pwd_id_packet_t);
if (session->peer_id_len >= sizeof(session->peer_id)) {
RDEBUG2("pwd id response is malformed");
return 0;
}
memcpy(session->peer_id, packet->identity, session->peer_id_len);
session->peer_id[session->peer_id_len] = '\0';
/*
* make fake request to get the password for the usable ID
*/
if ((fake = request_alloc_fake(handler->request)) == NULL) {
RDEBUG("pwd unable to create fake request!");
return 0;
}
fake->username = fr_pair_afrom_num(fake->packet, PW_USER_NAME, 0);
if (!fake->username) {
RDEBUG("Failed creating pair for peer id");
talloc_free(fake);
return 0;
}
fr_pair_value_bstrncpy(fake->username, session->peer_id, session->peer_id_len);
fr_pair_add(&fake->packet->vps, fake->username);
if ((vp = fr_pair_find_by_num(request->config, PW_VIRTUAL_SERVER, 0, TAG_ANY)) != NULL) {
fake->server = vp->vp_strvalue;
} else if (inst->virtual_server) {
fake->server = inst->virtual_server;
} /* else fake->server == request->server */
RDEBUG("Sending tunneled request");
rdebug_pair_list(L_DBG_LVL_1, request, fake->packet->vps, NULL);
if (fake->server) {
RDEBUG("server %s {", fake->server);
} else {
RDEBUG("server {");
}
/*
* Call authorization recursively, which will
* get the password.
*/
RINDENT();
process_authorize(0, fake);
REXDENT();
/*
* Note that we don't do *anything* with the reply
* attributes.
*/
if (fake->server) {
RDEBUG("} # server %s", fake->server);
} else {
RDEBUG("}");
}
RDEBUG("Got tunneled reply code %d", fake->reply->code);
rdebug_pair_list(L_DBG_LVL_1, request, fake->reply->vps, NULL);
if ((pw = fr_pair_find_by_num(fake->config, PW_CLEARTEXT_PASSWORD, 0, TAG_ANY)) == NULL) {
DEBUG2("failed to find password for %s to do pwd authentication",
session->peer_id);
talloc_free(fake);
return 0;
}
if (compute_password_element(session, session->group_num,
pw->data.strvalue, strlen(pw->data.strvalue),
inst->server_id, strlen(inst->server_id),
session->peer_id, strlen(session->peer_id),
&session->token)) {
DEBUG2("failed to obtain password element");
talloc_free(fake);
return 0;
}
TALLOC_FREE(fake);
/*
* compute our scalar and element
*/
if (compute_scalar_element(session, inst->bnctx)) {
DEBUG2("failed to compute server's scalar and element");
return 0;
}
MEM(x = BN_new());
MEM(y = BN_new());
/*
* element is a point, get both coordinates: x and y
*/
if (!EC_POINT_get_affine_coordinates_GFp(session->group, session->my_element, x, y,
inst->bnctx)) {
DEBUG2("server point assignment failed");
BN_clear_free(x);
BN_clear_free(y);
return 0;
}
/*
* construct request
*/
session->out_len = BN_num_bytes(session->order) + (2 * BN_num_bytes(session->prime));
if ((session->out = talloc_array(session, uint8_t, session->out_len)) == NULL) {
return 0;
}
memset(session->out, 0, session->out_len);
ptr = session->out;
offset = BN_num_bytes(session->prime) - BN_num_bytes(x);
BN_bn2bin(x, ptr + offset);
BN_clear_free(x);
ptr += BN_num_bytes(session->prime);
offset = BN_num_bytes(session->prime) - BN_num_bytes(y);
BN_bn2bin(y, ptr + offset);
BN_clear_free(y);
ptr += BN_num_bytes(session->prime);
offset = BN_num_bytes(session->order) - BN_num_bytes(session->my_scalar);
BN_bn2bin(session->my_scalar, ptr + offset);
session->state = PWD_STATE_COMMIT;
ret = send_pwd_request(session, eap_ds);
}
break;
case PWD_STATE_COMMIT:
if (EAP_PWD_GET_EXCHANGE(hdr) != EAP_PWD_EXCH_COMMIT) {
RDEBUG2("pwd exchange is incorrect: not commit!");
return 0;
}
/*
* process the peer's commit and generate the shared key, k
*/
if (process_peer_commit(session, in, in_len, inst->bnctx)) {
RDEBUG2("failed to process peer's commit");
return 0;
}
/*
* compute our confirm blob
*/
if (compute_server_confirm(session, session->my_confirm, inst->bnctx)) {
ERROR("rlm_eap_pwd: failed to compute confirm!");
return 0;
}
/*
* construct a response...which is just our confirm blob
*/
session->out_len = SHA256_DIGEST_LENGTH;
if ((session->out = talloc_array(session, uint8_t, session->out_len)) == NULL) {
return 0;
}
memset(session->out, 0, session->out_len);
memcpy(session->out, session->my_confirm, SHA256_DIGEST_LENGTH);
session->state = PWD_STATE_CONFIRM;
ret = send_pwd_request(session, eap_ds);
break;
case PWD_STATE_CONFIRM:
if (in_len < SHA256_DIGEST_LENGTH) {
RDEBUG("Peer confirm is too short (%zd < %d)",
in_len, SHA256_DIGEST_LENGTH);
return 0;
}
if (EAP_PWD_GET_EXCHANGE(hdr) != EAP_PWD_EXCH_CONFIRM) {
RDEBUG2("pwd exchange is incorrect: not commit!");
return 0;
}
if (compute_peer_confirm(session, peer_confirm, inst->bnctx)) {
RDEBUG2("pwd exchange cannot compute peer's confirm");
return 0;
}
if (CRYPTO_memcmp(peer_confirm, in, SHA256_DIGEST_LENGTH)) {
RDEBUG2("pwd exchange fails: peer confirm is incorrect!");
return 0;
}
if (compute_keys(session, peer_confirm, msk, emsk)) {
RDEBUG2("pwd exchange cannot generate (E)MSK!");
return 0;
}
eap_ds->request->code = PW_EAP_SUCCESS;
/*
* return the MSK (in halves)
*/
eap_add_reply(handler->request, "MS-MPPE-Recv-Key", msk, MPPE_KEY_LEN);
eap_add_reply(handler->request, "MS-MPPE-Send-Key", msk + MPPE_KEY_LEN, MPPE_KEY_LEN);
ret = 1;
break;
default:
RDEBUG2("unknown PWD state");
return 0;
}
/*
* we processed the buffered fragments, get rid of them
*/
if (session->in) {
talloc_free(session->in);
session->in = NULL;
}
return ret;
}
/*
* Allocate an IP number from the pool.
*/
static rlm_rcode_t CC_HINT(nonnull) mod_post_auth(void *instance, REQUEST *request)
{
rlm_sqlippool_t *inst = (rlm_sqlippool_t *) instance;
char allocation[MAX_STRING_LEN];
int allocation_len;
VALUE_PAIR *vp;
rlm_sql_handle_t *handle;
time_t now;
/*
* If there is a Framed-IP-Address attribute in the reply do nothing
*/
if (fr_pair_find_by_num(request->reply->vps, inst->framed_ip_address, 0, TAG_ANY) != NULL) {
RDEBUG("Framed-IP-Address already exists");
return do_logging(request, inst->log_exists, RLM_MODULE_NOOP);
}
if (fr_pair_find_by_num(request->config, PW_POOL_NAME, 0, TAG_ANY) == NULL) {
RDEBUG("No Pool-Name defined");
return do_logging(request, inst->log_nopool, RLM_MODULE_NOOP);
}
handle = fr_connection_get(inst->sql_inst->pool);
if (!handle) {
REDEBUG("Failed reserving SQL connection");
return RLM_MODULE_FAIL;
}
if (inst->sql_inst->sql_set_user(inst->sql_inst, request, NULL) < 0) {
return RLM_MODULE_FAIL;
}
/*
* Limit the number of clears we do. There are minor
* race conditions for the check, but so what. The
* actual work is protected by a transaction. The idea
* here is that if we're allocating 100 IPs a second,
* we're only do 1 CLEAR per second.
*/
now = time(NULL);
if (inst->last_clear < now) {
inst->last_clear = now;
DO_PART(allocate_begin);
DO_PART(allocate_clear);
DO_PART(allocate_commit);
}
DO_PART(allocate_begin);
allocation_len = sqlippool_query1(allocation, sizeof(allocation),
inst->allocate_find, handle,
inst, request, (char *) NULL, 0);
/*
* Nothing found...
*/
if (allocation_len == 0) {
DO_PART(allocate_commit);
/*
*Should we perform pool-check ?
*/
if (inst->pool_check && *inst->pool_check) {
/*
*Ok, so the allocate-find query found nothing ...
*Let's check if the pool exists at all
*/
allocation_len = sqlippool_query1(allocation, sizeof(allocation),
inst->pool_check, handle, inst, request,
(char *) NULL, 0);
fr_connection_release(inst->sql_inst->pool, handle);
if (allocation_len) {
/*
* Pool exists after all... So,
* the failure to allocate the IP
* address was most likely due to
* the depletion of the pool. In
* that case, we should return
* NOTFOUND
*/
RDEBUG("pool appears to be full");
return do_logging(request, inst->log_failed, RLM_MODULE_NOTFOUND);
}
/*
* Pool doesn't exist in the table. It
* may be handled by some other instance of
* sqlippool, so we should just ignore this
* allocation failure and return NOOP
*/
RDEBUG("IP address could not be allocated as no pool exists with that name");
return RLM_MODULE_NOOP;
}
fr_connection_release(inst->sql_inst->pool, handle);
RDEBUG("IP address could not be allocated");
return do_logging(request, inst->log_failed, RLM_MODULE_NOOP);
}
/*
* See if we can create the VP from the returned data. If not,
* error out. If so, add it to the list.
*/
vp = fr_pair_afrom_num(request->reply, inst->framed_ip_address, 0);
if (fr_pair_value_from_str(vp, allocation, allocation_len) < 0) {
DO_PART(allocate_commit);
RDEBUG("Invalid IP number [%s] returned from instbase query.", allocation);
fr_connection_release(inst->sql_inst->pool, handle);
return do_logging(request, inst->log_failed, RLM_MODULE_NOOP);
}
RDEBUG("Allocated IP %s", allocation);
fr_pair_add(&request->reply->vps, vp);
/*
* UPDATE
*/
sqlippool_command(inst->allocate_update, &handle, inst, request,
allocation, allocation_len);
DO_PART(allocate_commit);
fr_connection_release(inst->sql_inst->pool, handle);
return do_logging(request, inst->log_success, RLM_MODULE_OK);
}
/*
* Process the "diameter" contents of the tunneled data.
*/
PW_CODE eapttls_process(eap_handler_t *handler, tls_session_t *tls_session)
{
PW_CODE code = PW_CODE_ACCESS_REJECT;
rlm_rcode_t rcode;
REQUEST *fake;
VALUE_PAIR *vp;
ttls_tunnel_t *t;
uint8_t const *data;
size_t data_len;
REQUEST *request = handler->request;
chbind_packet_t *chbind;
/*
* Just look at the buffer directly, without doing
* record_minus.
*/
data_len = tls_session->clean_out.used;
tls_session->clean_out.used = 0;
data = tls_session->clean_out.data;
t = (ttls_tunnel_t *) tls_session->opaque;
/*
* If there's no data, maybe this is an ACK to an
* MS-CHAP2-Success.
*/
if (data_len == 0) {
if (t->authenticated) {
RDEBUG("Got ACK, and the user was already authenticated");
return PW_CODE_ACCESS_ACCEPT;
} /* else no session, no data, die. */
/*
* FIXME: Call SSL_get_error() to see what went
* wrong.
*/
RDEBUG2("SSL_read Error");
return PW_CODE_ACCESS_REJECT;
}
#ifndef NDEBUG
if ((rad_debug_lvl > 2) && fr_log_fp) {
size_t i;
for (i = 0; i < data_len; i++) {
if ((i & 0x0f) == 0) fprintf(fr_log_fp, " TTLS tunnel data in %04x: ", (int) i);
fprintf(fr_log_fp, "%02x ", data[i]);
if ((i & 0x0f) == 0x0f) fprintf(fr_log_fp, "\n");
}
if ((data_len & 0x0f) != 0) fprintf(fr_log_fp, "\n");
}
#endif
if (!diameter_verify(request, data, data_len)) {
return PW_CODE_ACCESS_REJECT;
}
/*
* Allocate a fake REQUEST structure.
*/
fake = request_alloc_fake(request);
rad_assert(!fake->packet->vps);
/*
* Add the tunneled attributes to the fake request.
*/
fake->packet->vps = diameter2vp(request, fake, tls_session->ssl, data, data_len);
if (!fake->packet->vps) {
talloc_free(fake);
return PW_CODE_ACCESS_REJECT;
}
/*
* Tell the request that it's a fake one.
*/
pair_make_request("Freeradius-Proxied-To", "127.0.0.1", T_OP_EQ);
RDEBUG("Got tunneled request");
rdebug_pair_list(L_DBG_LVL_1, request, fake->packet->vps, NULL);
/*
* Update other items in the REQUEST data structure.
*/
fake->username = fr_pair_find_by_num(fake->packet->vps, PW_USER_NAME, 0, TAG_ANY);
fake->password = fr_pair_find_by_num(fake->packet->vps, PW_USER_PASSWORD, 0, 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_num(fake->packet->vps, PW_EAP_MESSAGE, 0, TAG_ANY);
if (vp &&
(vp->vp_length >= EAP_HEADER_LEN + 2) &&
(vp->vp_strvalue[0] == PW_EAP_RESPONSE) &&
(vp->vp_strvalue[EAP_HEADER_LEN] == PW_EAP_IDENTITY) &&
(vp->vp_strvalue[EAP_HEADER_LEN + 1] != 0)) {
/*
* Create & remember a User-Name
*/
t->username = fr_pair_make(t, NULL, "User-Name", NULL, T_OP_EQ);
rad_assert(t->username != NULL);
fr_pair_value_bstrncpy(t->username, vp->vp_octets + 5, vp->vp_length - 5);
RDEBUG("Got tunneled identity of %s",
t->username->vp_strvalue);
/*
* If there's a default EAP type,
* set it here.
*/
if (t->default_method != 0) {
RDEBUG("Setting default EAP type for tunneled EAP session");
vp = fr_pair_afrom_num(fake, PW_EAP_TYPE, 0);
rad_assert(vp != NULL);
vp->vp_integer = t->default_method;
fr_pair_add(&fake->config, vp);
}
} 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_list_copy(fake->packet, t->username);
fr_pair_add(&fake->packet->vps, vp);
fake->username = fr_pair_find_by_num(fake->packet->vps, PW_USER_NAME, 0, TAG_ANY);
}
} /* else the request ALREADY had a User-Name */
/*
* Add the State attribute, too, if it exists.
*/
if (t->state) {
vp = fr_pair_list_copy(fake->packet, t->state);
if (vp) fr_pair_add(&fake->packet->vps, vp);
}
/*
* If this is set, we copy SOME of the request attributes
* from outside of the tunnel to inside of the tunnel.
*
* We copy ONLY those attributes which do NOT already
* exist in the tunneled request.
*/
if (t->copy_request_to_tunnel) {
VALUE_PAIR *copy;
vp_cursor_t cursor;
for (vp = fr_cursor_init(&cursor, &request->packet->vps); vp; vp = fr_cursor_next(&cursor)) {
/*
* The attribute is a server-side thingy,
* don't copy it.
*/
if ((vp->da->attr > 255) &&
(vp->da->vendor == 0)) {
continue;
}
/*
* The outside attribute is already in the
* tunnel, don't copy it.
*
* This works for BOTH attributes which
* are originally in the tunneled request,
* AND attributes which are copied there
* from below.
*/
if (fr_pair_find_by_da(fake->packet->vps, vp->da, TAG_ANY)) {
continue;
}
/*
* Some attributes are handled specially.
*/
switch (vp->da->attr) {
/*
* NEVER copy Message-Authenticator,
* EAP-Message, or State. They're
* only for outside of the tunnel.
*/
case PW_USER_NAME:
case PW_USER_PASSWORD:
case PW_CHAP_PASSWORD:
case PW_CHAP_CHALLENGE:
case PW_PROXY_STATE:
case PW_MESSAGE_AUTHENTICATOR:
case PW_EAP_MESSAGE:
case PW_STATE:
continue;
/*
* By default, copy it over.
*/
default:
break;
}
/*
* Don't copy from the head, we've already
* checked it.
*/
copy = fr_pair_list_copy_by_num(fake->packet, vp, vp->da->attr, vp->da->vendor, TAG_ANY);
fr_pair_add(&fake->packet->vps, copy);
}
}
if ((vp = fr_pair_find_by_num(request->config, PW_VIRTUAL_SERVER, 0, TAG_ANY)) != NULL) {
fake->server = vp->vp_strvalue;
} else if (t->virtual_server) {
fake->server = t->virtual_server;
} /* else fake->server == request->server */
if ((rad_debug_lvl > 0) && fr_log_fp) {
RDEBUG("Sending tunneled request");
}
/*
* Process channel binding.
*/
chbind = eap_chbind_vp2packet(fake, fake->packet->vps);
if (chbind) {
PW_CODE chbind_code;
CHBIND_REQ *req = talloc_zero(fake, CHBIND_REQ);
RDEBUG("received chbind request");
req->request = chbind;
if (fake->username) {
req->username = fake->username;
} else {
req->username = NULL;
}
chbind_code = chbind_process(request, req);
/* encapsulate response here */
if (req->response) {
RDEBUG("sending chbind response");
fr_pair_add(&fake->reply->vps,
eap_chbind_packet2vp(fake, req->response));
} else {
RDEBUG("no chbind response");
}
/* clean up chbind req */
talloc_free(req);
if (chbind_code != PW_CODE_ACCESS_ACCEPT) {
return chbind_code;
}
}
/*
* Call authentication recursively, which will
* do PAP, CHAP, MS-CHAP, etc.
*/
rad_virtual_server(fake);
/*
* 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_num(fake->config, PW_PROXY_TO_REALM, 0, TAG_ANY);
if (vp) {
eap_tunnel_data_t *tunnel;
RDEBUG("Tunneled authentication will be proxied to %s", vp->vp_strvalue);
/*
* Tell the original request that it's going
* to be proxied.
*/
fr_pair_list_move_by_num(request, &request->config,
&fake->config,
PW_PROXY_TO_REALM, 0, TAG_ANY);
/*
* Seed the proxy packet with the
* tunneled request.
*/
rad_assert(!request->proxy);
request->proxy = talloc_steal(request, fake->packet);
memset(&request->proxy->src_ipaddr, 0,
sizeof(request->proxy->src_ipaddr));
memset(&request->proxy->src_ipaddr, 0,
sizeof(request->proxy->src_ipaddr));
request->proxy->src_port = 0;
request->proxy->dst_port = 0;
fake->packet = NULL;
rad_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;
tunnel->callback = eapttls_postproxy;
/*
* Associate the callback with the request.
*/
code = request_data_add(request, request->proxy, REQUEST_DATA_EAP_TUNNEL_CALLBACK,
tunnel, false);
rad_assert(code == 0);
/*
* rlm_eap.c has taken care of associating
* the handler with the fake request.
*
* So we associate the fake request with
* this request.
*/
code = request_data_add(request, request->proxy, REQUEST_DATA_EAP_MSCHAP_TUNNEL_CALLBACK,
fake, true);
rad_assert(code == 0);
fake = NULL;
/*
* Didn't authenticate the packet, but
* we're proxying it.
*/
code = PW_CODE_STATUS_CLIENT;
} else
#endif /* WITH_PROXY */
{
RDEBUG("No tunneled reply was found for request %d , and the request was not proxied: rejecting the user.",
request->number);
code = PW_CODE_ACCESS_REJECT;
}
break;
default:
/*
* Returns RLM_MODULE_FOO, and we want to return PW_FOO
*/
rcode = process_reply(handler, tls_session, request, fake->reply);
switch (rcode) {
case RLM_MODULE_REJECT:
code = PW_CODE_ACCESS_REJECT;
break;
case RLM_MODULE_HANDLED:
code = PW_CODE_ACCESS_CHALLENGE;
break;
case RLM_MODULE_OK:
code = PW_CODE_ACCESS_ACCEPT;
break;
default:
code = PW_CODE_ACCESS_REJECT;
break;
}
break;
}
talloc_free(fake);
return code;
}
/*
* Convert diameter attributes to our VALUE_PAIR's
*/
static VALUE_PAIR *diameter2vp(REQUEST *request, REQUEST *fake, SSL *ssl,
uint8_t const *data, size_t data_len)
{
uint32_t attr;
uint32_t vendor;
uint32_t length;
size_t offset;
size_t size;
size_t data_left = data_len;
VALUE_PAIR *first = NULL;
VALUE_PAIR *vp;
RADIUS_PACKET *packet = fake->packet; /* FIXME: api issues */
vp_cursor_t out;
fr_cursor_init(&out, &first);
while (data_left > 0) {
rad_assert(data_left <= data_len);
memcpy(&attr, data, sizeof(attr));
data += 4;
attr = ntohl(attr);
vendor = 0;
memcpy(&length, data, sizeof(length));
data += 4;
length = ntohl(length);
/*
* A "vendor" flag, with a vendor ID of zero,
* is equivalent to no vendor. This is stupid.
*/
offset = 8;
if ((length & ((uint32_t)1 << 31)) != 0) {
memcpy(&vendor, data, sizeof(vendor));
vendor = ntohl(vendor);
data += 4; /* skip the vendor field, it's zero */
offset += 4; /* offset to value field */
if (attr > 65535) goto next_attr;
if (vendor > FR_MAX_VENDOR) goto next_attr;
}
/*
* FIXME: Handle the M bit. For now, we assume that
* some other module takes care of any attribute
* with the M bit set.
*/
/*
* Get the length.
*/
length &= 0x00ffffff;
/*
* Get the size of the value portion of the
* attribute.
*/
size = length - offset;
/*
* Vendor attributes can be larger than 255.
* Normal attributes cannot be.
*/
if ((attr > 255) && (vendor == 0)) {
RWDEBUG2("Skipping Diameter attribute %u", attr);
goto next_attr;
}
/*
* EAP-Message AVPs can be larger than 253 octets.
*
* For now, we rely on the main decoder in
* src/lib/radius to decode data into VPs. This
* means putting the data into a RADIUS attribute
* format. It also means that we can't handle
* "extended" attributes in the Diameter space. Oh well...
*/
if ((size > 253) && !((vendor == 0) && (attr == PW_EAP_MESSAGE))) {
RWDEBUG2("diameter2vp skipping long attribute %u", attr);
goto next_attr;
}
/*
* RADIUS VSAs are handled as Diameter attributes
* with Vendor-Id == 0, and the VSA data packed
* into the "String" field as per normal.
*
* EXCEPT for the MS-CHAP attributes.
*/
if ((vendor == 0) && (attr == PW_VENDOR_SPECIFIC)) {
ssize_t decoded;
uint8_t buffer[256];
buffer[0] = PW_VENDOR_SPECIFIC;
buffer[1] = size + 2;
memcpy(buffer + 2, data, size);
vp = NULL;
decoded = rad_attr2vp(packet, NULL, NULL, NULL,
buffer, size + 2, &vp);
if (decoded < 0) {
REDEBUG2("diameter2vp failed decoding attr: %s",
fr_strerror());
goto do_octets;
}
if ((size_t) decoded != size + 2) {
REDEBUG2("diameter2vp failed to entirely decode VSA");
fr_pair_list_free(&vp);
goto do_octets;
}
fr_cursor_merge(&out, vp);
goto next_attr;
}
/*
* Create it. If this fails, it's because we're OOM.
*/
do_octets:
vp = fr_pair_afrom_num(packet, attr, vendor);
if (!vp) {
RDEBUG2("Failure in creating VP");
fr_pair_list_free(&first);
return NULL;
}
/*
* If it's a type from our dictionary, then
* we need to put the data in a relevant place.
*
* @todo: Export the lib/radius.c decoder, and use it here!
*/
switch (vp->da->type) {
case PW_TYPE_INTEGER:
case PW_TYPE_DATE:
if (size != vp->vp_length) {
DICT_ATTR const *da;
/*
* Bad format. Create a "raw"
* attribute.
*/
raw:
if (vp) fr_pair_list_free(&vp);
da = dict_unknown_afrom_fields(packet, attr, vendor);
if (!da) return NULL;
vp = fr_pair_afrom_da(packet, da);
if (!vp) return NULL;
fr_pair_value_memcpy(vp, data, size);
break;
}
memcpy(&vp->vp_integer, data, vp->vp_length);
/*
* Stored in host byte order: change it.
*/
vp->vp_integer = ntohl(vp->vp_integer);
break;
case PW_TYPE_INTEGER64:
if (size != vp->vp_length) goto raw;
memcpy(&vp->vp_integer64, data, vp->vp_length);
/*
* Stored in host byte order: change it.
*/
vp->vp_integer64 = ntohll(vp->vp_integer64);
break;
case PW_TYPE_IPV4_ADDR:
if (size != vp->vp_length) {
RDEBUG2("Invalid length attribute %d",
attr);
fr_pair_list_free(&first);
fr_pair_list_free(&vp);
return NULL;
}
memcpy(&vp->vp_ipaddr, data, vp->vp_length);
/*
* Stored in network byte order: don't change it.
*/
break;
case PW_TYPE_BYTE:
if (size != vp->vp_length) goto raw;
vp->vp_byte = data[0];
break;
case PW_TYPE_SHORT:
if (size != vp->vp_length) goto raw;
vp->vp_short = (data[0] * 256) + data[1];
break;
case PW_TYPE_SIGNED:
if (size != vp->vp_length) goto raw;
memcpy(&vp->vp_signed, data, vp->vp_length);
vp->vp_signed = ntohl(vp->vp_signed);
break;
case PW_TYPE_IPV6_ADDR:
if (size != vp->vp_length) goto raw;
memcpy(&vp->vp_ipv6addr, data, vp->vp_length);
break;
case PW_TYPE_IPV6_PREFIX:
if (size != vp->vp_length) goto raw;
memcpy(vp->vp_ipv6prefix, data, vp->vp_length);
break;
case PW_TYPE_STRING:
fr_pair_value_bstrncpy(vp, data, size);
vp->vp_length = strlen(vp->vp_strvalue); /* embedded zeros are NOT allowed */
break;
/*
* Copy it over verbatim.
*/
case PW_TYPE_OCTETS:
default:
fr_pair_value_memcpy(vp, data, size);
break;
}
/*
* Ensure that the client is using the
* correct challenge. This weirdness is
* to protect against against replay
* attacks, where anyone observing the
* CHAP exchange could pose as that user,
* by simply choosing to use the same
* challenge.
*
* By using a challenge based on
* information from the current session,
* we can guarantee that the client is
* not *choosing* a challenge.
*
* We're a little forgiving in that we
* have loose checks on the length, and
* we do NOT check the Id (first octet of
* the response to the challenge)
*
* But if the client gets the challenge correct,
* we're not too worried about the Id.
*/
if (((vp->da->vendor == 0) && (vp->da->attr == PW_CHAP_CHALLENGE)) ||
((vp->da->vendor == VENDORPEC_MICROSOFT) && (vp->da->attr == PW_MSCHAP_CHALLENGE))) {
uint8_t challenge[16];
if ((vp->vp_length < 8) ||
(vp->vp_length > 16)) {
RDEBUG("Tunneled challenge has invalid length");
fr_pair_list_free(&first);
fr_pair_list_free(&vp);
return NULL;
}
eapttls_gen_challenge(ssl, challenge,
sizeof(challenge));
if (memcmp(challenge, vp->vp_octets,
vp->vp_length) != 0) {
RDEBUG("Tunneled challenge is incorrect");
fr_pair_list_free(&first);
fr_pair_list_free(&vp);
return NULL;
}
}
/*
* Update the list.
*/
fr_cursor_insert(&out, vp);
next_attr:
/*
* Catch non-aligned attributes.
*/
if (data_left == length) break;
/*
* The length does NOT include the padding, so
* we've got to account for it here by rounding up
* to the nearest 4-byte boundary.
*/
length += 0x03;
length &= ~0x03;
rad_assert(data_left >= length);
data_left -= length;
data += length - offset; /* already updated */
}
/*
* We got this far. It looks OK.
*/
return first;
}
/*
* Generate a challenge to be presented to the user.
*/
static rlm_rcode_t CC_HINT(nonnull) mod_authorize(void *instance, REQUEST *request)
{
rlm_otp_t *inst = (rlm_otp_t *) instance;
char challenge[OTP_MAX_CHALLENGE_LEN + 1]; /* +1 for '\0' terminator */
int auth_type_found;
/* Early exit if Auth-Type != inst->name */
{
VALUE_PAIR *vp;
auth_type_found = 0;
vp = fr_pair_find_by_num(request->config, PW_AUTH_TYPE, 0, TAG_ANY);
if (vp) {
auth_type_found = 1;
if (strcmp(vp->vp_strvalue, inst->name)) {
return RLM_MODULE_NOOP;
}
}
}
/* The State attribute will be present if this is a response. */
if (fr_pair_find_by_num(request->packet->vps, PW_STATE, 0, TAG_ANY) != NULL) {
DEBUG("rlm_otp: autz: Found response to Access-Challenge");
return RLM_MODULE_OK;
}
/* User-Name attribute required. */
if (!request->username) {
RWDEBUG("Attribute \"User-Name\" "
"required for authentication");
return RLM_MODULE_INVALID;
}
if (otp_pwe_present(request) == 0) {
RWDEBUG("Attribute "
"\"User-Password\" or equivalent required "
"for authentication");
return RLM_MODULE_INVALID;
}
/*
* We used to check for special "challenge" and "resync" passcodes
* here, but these are complicated to explain and application is
* limited. More importantly, since we've removed all actual OTP
* code (now we ask otpd), it's awkward for us to support them.
* Should the need arise to reinstate these options, the most
* likely choice is to duplicate some otpd code here.
*/
if (inst->allow_sync && !inst->allow_async) {
/* This is the token sync response. */
if (!auth_type_found) {
pair_make_config("Auth-Type", inst->name, T_OP_EQ);
}
return RLM_MODULE_OK;
}
/*
* Generate a random challenge.
*/
otp_async_challenge(challenge, inst->challenge_len);
/*
* Create the State attribute, which will be returned to
* us along with the response.
*
* We will need this to verify the response.
*
* It must be hmac protected to prevent insertion of arbitrary
* State by an inside attacker.
*
* If we won't actually use the State (server config doesn't
* allow async), we just use a trivial State.
*
* We always create at least a trivial State, so mod_authorize()
* can quickly pass on to mod_authenticate().
*/
{
int32_t now = htonl(time(NULL)); //!< Low-order 32 bits on LP64.
char gen_state[OTP_MAX_RADSTATE_LEN];
size_t len;
VALUE_PAIR *vp;
len = otp_gen_state(gen_state, challenge, inst->challenge_len,
0, now, inst->hmac_key);
vp = fr_pair_afrom_num(request->reply, PW_STATE, 0);
if (!vp) {
return RLM_MODULE_FAIL;
}
fr_pair_value_memcpy(vp, (uint8_t const *) gen_state, len);
fr_pair_add(&request->reply->vps, vp);
}
/*
* Add the challenge to the reply.
*/
{
VALUE_PAIR *vp;
char *expanded = NULL;
ssize_t len;
/*
* First add the internal OTP challenge attribute to
* the reply list.
*/
vp = fr_pair_afrom_num(request->reply, PW_OTP_CHALLENGE, 0);
if (!vp) {
return RLM_MODULE_FAIL;
}
fr_pair_value_strcpy(vp, challenge);
vp->op = T_OP_SET;
fr_pair_add(&request->reply->vps, vp);
/*
* Then add the message to the user to they known
* what the challenge value is.
*/
len = radius_axlat(&expanded, request, inst->chal_prompt, NULL, NULL);
if (len < 0) {
return RLM_MODULE_FAIL;
}
vp = fr_pair_afrom_num(request->reply, PW_REPLY_MESSAGE, 0);
if (!vp) {
talloc_free(expanded);
return RLM_MODULE_FAIL;
}
(void) talloc_steal(vp, expanded);
vp->vp_strvalue = expanded;
vp->vp_length = len;
vp->op = T_OP_SET;
vp->type = VT_DATA;
fr_pair_add(&request->reply->vps, vp);
}
/*
* Mark the packet as an Access-Challenge packet.
* The server will take care of sending it to the user.
*/
request->reply->code = PW_CODE_ACCESS_CHALLENGE;
DEBUG("rlm_otp: Sending Access-Challenge");
if (!auth_type_found) {
pair_make_config("Auth-Type", inst->name, T_OP_EQ);
}
return RLM_MODULE_HANDLED;
}
static rlm_rcode_t dhcp_process(REQUEST *request)
{
rlm_rcode_t rcode;
unsigned int i;
VALUE_PAIR *vp;
dhcp_socket_t *sock;
/*
* If there's a giaddr, save it as the Relay-IP-Address
* in the response. That way the later code knows where
* to send the reply.
*/
vp = fr_pair_find_by_num(request->packet->vps, DHCP_MAGIC_VENDOR, 266, TAG_ANY); /* DHCP-Gateway-IP-Address */
if (vp && (vp->vp_ipv4addr != htonl(INADDR_ANY))) {
VALUE_PAIR *relay;
/* DHCP-Relay-IP-Address */
MEM(relay = fr_pair_afrom_num(request->reply, DHCP_MAGIC_VENDOR, 222));
relay->vp_ipv4addr = vp->vp_ipv4addr;
fr_pair_add(&request->reply->vps, relay);
}
vp = fr_pair_find_by_num(request->packet->vps, DHCP_MAGIC_VENDOR, 53, TAG_ANY); /* DHCP-Message-Type */
if (vp) {
fr_dict_enum_t *dv = fr_dict_enum_by_value(vp->da, &vp->data);
if (dv) {
CONF_SECTION *server, *unlang;
RDEBUG("Trying sub-section dhcp %s {...}", dv->alias);
server = cf_item_to_section(cf_parent(request->listener->cs));
unlang = cf_section_find(server, "dhcp", dv->alias);
rcode = unlang_interpret(request, unlang, RLM_MODULE_NOOP);
} else {
REDEBUG("Unknown DHCP-Message-Type %d", vp->vp_uint8);
rcode = RLM_MODULE_FAIL;
}
} else {
REDEBUG("Failed to find DHCP-Message-Type in packet!");
rcode = RLM_MODULE_FAIL;
}
vp = fr_pair_find_by_num(request->reply->vps, DHCP_MAGIC_VENDOR, 53, TAG_ANY); /* DHCP-Message-Type */
if (vp) {
request->reply->code = vp->vp_uint8;
}
else switch (rcode) {
case RLM_MODULE_OK:
case RLM_MODULE_UPDATED:
if (request->packet->code == FR_DHCP_DISCOVER) {
request->reply->code = FR_DHCP_OFFER;
break;
} else if (request->packet->code == FR_DHCP_REQUEST) {
request->reply->code = FR_DHCP_ACK;
break;
}
request->reply->code = FR_DHCP_NAK;
break;
default:
case RLM_MODULE_REJECT:
case RLM_MODULE_FAIL:
case RLM_MODULE_INVALID:
case RLM_MODULE_NOOP:
case RLM_MODULE_NOTFOUND:
if (request->packet->code == FR_DHCP_DISCOVER) {
request->reply->code = 0; /* ignore the packet */
} else {
request->reply->code = FR_DHCP_NAK;
}
break;
case RLM_MODULE_HANDLED:
request->reply->code = 0; /* ignore the packet */
break;
}
/*
* TODO: Handle 'output' of RLM_MODULE when acting as a
* DHCP relay We may want to not forward packets in
* certain circumstances.
*/
/*
* Handle requests when acting as a DHCP relay
*/
vp = fr_pair_find_by_num(request->packet->vps, DHCP_MAGIC_VENDOR, 256, TAG_ANY); /* DHCP-Opcode */
if (!vp) {
RPEDEBUG("Someone deleted the DHCP-Opcode!");
return RLM_MODULE_FAIL;
}
/* BOOTREPLY received on port 67 (i.e. from a server) */
if (vp->vp_uint8 == 2) {
return dhcprelay_process_server_reply(request);
}
/* Packet from client, and we have DHCP-Relay-To-IP-Address */
if (fr_pair_find_by_num(request->control, DHCP_MAGIC_VENDOR, 270, TAG_ANY)) {
return dhcprelay_process_client_request(request);
}
/* else it's a packet from a client, without relaying */
rad_assert(vp->vp_uint8 == 1); /* BOOTREQUEST */
sock = request->listener->data;
/*
* Handle requests when acting as a DHCP server
*/
/*
* Releases don't get replies.
*/
if (request->packet->code == FR_DHCP_RELEASE) {
request->reply->code = 0;
}
if (request->reply->code == 0) {
return RLM_MODULE_OK;
}
request->reply->sockfd = request->packet->sockfd;
/*
* Copy specific fields from packet to reply, if they
* don't already exist
*/
for (i = 0; i < sizeof(attrnums) / sizeof(attrnums[0]); i++) {
uint32_t attr = attrnums[i];
if (fr_pair_find_by_num(request->reply->vps, DHCP_MAGIC_VENDOR, attr, TAG_ANY)) continue;
vp = fr_pair_find_by_num(request->packet->vps, DHCP_MAGIC_VENDOR, attr, TAG_ANY);
if (vp) {
fr_pair_add(&request->reply->vps, fr_pair_copy(request->reply, vp));
}
}
vp = fr_pair_find_by_num(request->reply->vps, DHCP_MAGIC_VENDOR, 256, TAG_ANY); /* DHCP-Opcode */
rad_assert(vp != NULL);
vp->vp_uint8 = 2; /* BOOTREPLY */
/*
* Allow NAKs to be delayed for a short period of time.
*/
if (request->reply->code == FR_DHCP_NAK) {
vp = fr_pair_find_by_num(request->reply->vps, 0, FR_FREERADIUS_RESPONSE_DELAY, TAG_ANY);
if (vp) {
if (vp->vp_uint32 <= 10) {
request->response_delay.tv_sec = vp->vp_uint32;
request->response_delay.tv_usec = 0;
} else {
request->response_delay.tv_sec = 10;
request->response_delay.tv_usec = 0;
}
} else {
#ifndef USEC
#define USEC 1000000
#endif
vp = fr_pair_find_by_num(request->reply->vps, 0, FR_FREERADIUS_RESPONSE_DELAY_USEC, TAG_ANY);
if (vp) {
if (vp->vp_uint32 <= 10 * USEC) {
request->response_delay.tv_sec = vp->vp_uint32 / USEC;
request->response_delay.tv_usec = vp->vp_uint32 % USEC;
} else {
request->response_delay.tv_sec = 10;
request->response_delay.tv_usec = 0;
}
}
}
}
/*
* Prepare the reply packet for sending through dhcp_socket_send()
*/
request->reply->dst_ipaddr.af = AF_INET;
request->reply->src_ipaddr.af = AF_INET;
request->reply->src_ipaddr.prefix = 32;
/*
* Packet-Src-IP-Address has highest precedence
*/
vp = fr_pair_find_by_num(request->reply->vps, 0, FR_PACKET_SRC_IP_ADDRESS, TAG_ANY);
if (vp) {
request->reply->if_index = 0; /* Must be 0, we don't know the outbound if_index */
request->reply->src_ipaddr.addr.v4.s_addr = vp->vp_ipv4addr;
/*
* The request was unicast (via a relay)
*/
} else if (request->packet->dst_ipaddr.addr.v4.s_addr != htonl(INADDR_BROADCAST) &&
request->packet->dst_ipaddr.addr.v4.s_addr != htonl(INADDR_ANY)) {
request->reply->src_ipaddr.addr.v4.s_addr = request->packet->dst_ipaddr.addr.v4.s_addr;
request->reply->if_index = request->packet->if_index;
/*
* The listener was bound to an IP address, or we determined
* the address automatically, as it was the only address bound
* to the interface, and we bound to the interface.
*/
} else if (sock->src_ipaddr.addr.v4.s_addr != htonl(INADDR_ANY)) {
request->reply->src_ipaddr.addr.v4.s_addr = sock->src_ipaddr.addr.v4.s_addr;
#ifdef WITH_IFINDEX_IPADDR_RESOLUTION
/*
* We built with udpfromto and have the if_index of the receiving
* interface, which we can now resolve to an IP address.
*/
} else if (request->packet->if_index > 0) {
fr_ipaddr_t primary;
if (fr_ipaddr_from_ifindex(&primary, request->packet->sockfd, request->packet->dst_ipaddr.af,
request->packet->if_index) < 0) {
RPEDEBUG("Failed determining src_ipaddr from if_index");
return RLM_MODULE_FAIL;
}
request->reply->src_ipaddr.addr.v4.s_addr = primary.addr.v4.s_addr;
#endif
/*
* There's a Server-Identification attribute
*/
} else if ((vp = fr_pair_find_by_num(request->reply->vps, DHCP_MAGIC_VENDOR, 54, TAG_ANY))) {
request->reply->src_ipaddr.addr.v4.s_addr = vp->vp_ipv4addr;
} else {
REDEBUG("Unable to determine correct src_ipaddr for response");
return RLM_MODULE_FAIL;
}
request->reply->dst_port = request->packet->src_port;
request->reply->src_port = request->packet->dst_port;
/*
* Answer to client's nearest DHCP relay.
*
* Which may be different than the giaddr given in the
* packet to the client. i.e. the relay may have a
* public IP, but the gateway a private one.
*/
vp = fr_pair_find_by_num(request->reply->vps, DHCP_MAGIC_VENDOR, 272, TAG_ANY); /* DHCP-Relay-IP-Address */
if (vp && (vp->vp_ipv4addr != ntohl(INADDR_ANY))) {
RDEBUG2("Reply will be unicast to giaddr from original packet");
request->reply->dst_ipaddr.addr.v4.s_addr = vp->vp_ipv4addr;
request->reply->dst_port = request->packet->dst_port;
vp = fr_pair_find_by_num(request->reply->vps, 0, FR_PACKET_DST_PORT, TAG_ANY);
if (vp) request->reply->dst_port = vp->vp_uint16;
return RLM_MODULE_OK;
}
/*
* Answer to client's nearest DHCP gateway. In this
* case, the client can reach the gateway, as can the
* server.
*
* We also use *our* source port as the destination port.
* Gateways are servers, and listen on the server port,
* not the client port.
*/
vp = fr_pair_find_by_num(request->reply->vps, DHCP_MAGIC_VENDOR, 266, TAG_ANY); /* DHCP-Gateway-IP-Address */
if (vp && (vp->vp_ipv4addr != htonl(INADDR_ANY))) {
RDEBUG2("Reply will be unicast to giaddr");
request->reply->dst_ipaddr.addr.v4.s_addr = vp->vp_ipv4addr;
request->reply->dst_port = request->packet->dst_port;
return RLM_MODULE_OK;
}
/*
* If it's a NAK, or the broadcast flag was set, ond
* there's no client-ip-address, send a broadcast.
*/
if ((request->reply->code == FR_DHCP_NAK) ||
((vp = fr_pair_find_by_num(request->reply->vps, DHCP_MAGIC_VENDOR, 262, TAG_ANY)) && /* DHCP-Flags */
(vp->vp_uint32 & 0x8000) &&
((vp = fr_pair_find_by_num(request->reply->vps, DHCP_MAGIC_VENDOR, 263, TAG_ANY)) && /* DHCP-Client-IP-Address */
(vp->vp_ipv4addr == htonl(INADDR_ANY))))) {
/*
* RFC 2131, page 23
*
* Broadcast on
* - DHCPNAK
* or
* - Broadcast flag is set up and ciaddr == NULL
*/
RDEBUG2("Reply will be broadcast");
request->reply->dst_ipaddr.addr.v4.s_addr = htonl(INADDR_BROADCAST);
return RLM_MODULE_OK;
}
/*
* RFC 2131, page 23
*
* Unicast to ciaddr if present, otherwise to yiaddr.
*/
if ((vp = fr_pair_find_by_num(request->reply->vps, DHCP_MAGIC_VENDOR, 263, TAG_ANY)) && /* DHCP-Client-IP-Address */
(vp->vp_ipv4addr != htonl(INADDR_ANY))) {
RDEBUG2("Reply will be sent unicast to &DHCP-Client-IP-Address");
request->reply->dst_ipaddr.addr.v4.s_addr = vp->vp_ipv4addr;
return RLM_MODULE_OK;
}
vp = fr_pair_find_by_num(request->reply->vps, DHCP_MAGIC_VENDOR, 264, TAG_ANY); /* DHCP-Your-IP-Address */
if (!vp) {
REDEBUG("Can't assign address to client: Neither &reply:DHCP-Client-IP-Address nor "
"&reply:DHCP-Your-IP-Address set");
/*
* There is nowhere to send the response to, so don't bother.
*/
request->reply->code = 0;
return RLM_MODULE_FAIL;
}
#ifdef SIOCSARP
/*
* The system is configured to listen for broadcast
* packets, which means we'll need to send unicast
* replies, to IPs which haven't yet been assigned.
* Therefore, we need to update the ARP table.
*
* However, they haven't specified a interface. So we
* can't update the ARP table. And we must send a
* broadcast response.
*/
if (sock->lsock.broadcast && !sock->src_interface) {
WARN("You MUST set \"interface\" if you have \"broadcast = yes\"");
RDEBUG2("Reply will be broadcast as no interface was defined");
request->reply->dst_ipaddr.addr.v4.s_addr = htonl(INADDR_BROADCAST);
return RLM_MODULE_OK;
}
RDEBUG2("Reply will be unicast to &DHCP-Your-IP-Address");
request->reply->dst_ipaddr.addr.v4.s_addr = vp->vp_ipv4addr;
/*
* When sending a DHCP_OFFER, make sure our ARP table
* contains an entry for the client IP address.
* Otherwise the packet may not be sent to the client, as
* the OS has no ARP entry for it.
*
* This is a cute hack to avoid us having to create a raw
* socket to send DHCP packets.
*/
if (request->reply->code == FR_DHCP_OFFER) {
VALUE_PAIR *hwvp = fr_pair_find_by_num(request->reply->vps, DHCP_MAGIC_VENDOR, 267, TAG_ANY); /* DHCP-Client-Hardware-Address */
if (!hwvp) return RLM_MODULE_FAIL;
if (fr_dhcpv4_udp_add_arp_entry(request->reply->sockfd, sock->src_interface,
&vp->vp_ip, hwvp->vp_ether) < 0) {
RPEDEBUG("Failed adding arp entry");
return RLM_MODULE_FAIL;
}
}
#else
if (request->packet->src_ipaddr.addr.v4.s_addr != ntohl(INADDR_NONE)) {
RDEBUG2("Reply will be unicast to the unicast source IP address");
request->reply->dst_ipaddr.addr.v4.s_addr = request->packet->src_ipaddr.addr.v4.s_addr;
} else {
RDEBUG2("Reply will be broadcast as this system does not support ARP updates");
request->reply->dst_ipaddr.addr.v4.s_addr = htonl(INADDR_BROADCAST);
}
#endif
return RLM_MODULE_OK;
}
/** Continue a TLS handshake
*
* Advance the TLS handshake by feeding OpenSSL data from dirty_in,
* and reading data from OpenSSL into dirty_out.
*
* @param request The current request.
* @param session The current TLS session.
* @return
* - 0 on error.
* - 1 on success.
*/
int tls_session_handshake(REQUEST *request, tls_session_t *session)
{
int ret;
/*
* This is a logic error. tls_session_handshake
* must not be called if the handshake is
* complete tls_session_recv must be
* called instead.
*/
if (SSL_is_init_finished(session->ssl)) {
REDEBUG("Attempted to continue TLS handshake, but handshake has completed");
return 0;
}
if (session->invalid) {
REDEBUG("Preventing invalid session from continuing");
return 0;
}
/*
* Feed dirty data into OpenSSL, so that is can either
* process it as Application data (decrypting it)
* or continue the TLS handshake.
*/
if (session->dirty_in.used) {
ret = BIO_write(session->into_ssl, session->dirty_in.data, session->dirty_in.used);
if (ret != (int)session->dirty_in.used) {
REDEBUG("Failed writing %zd bytes to TLS BIO: %d", session->dirty_in.used, ret);
record_init(&session->dirty_in);
return 0;
}
record_init(&session->dirty_in);
}
/*
* Magic/More magic? Although SSL_read is normally
* used to read application data, it will also
* continue the TLS handshake. Removing this call will
* cause the handshake to fail.
*
* We don't ever expect to actually *receive* application
* data here.
*
* The reason why we call SSL_read instead of SSL_accept,
* or SSL_connect, as it allows this function
* to be used, irrespective or whether we're acting
* as a client or a server.
*
* If acting as a client SSL_set_connect_state must have
* been called before this function.
*
* If acting as a server SSL_set_accept_state must have
* been called before this function.
*/
ret = SSL_read(session->ssl, session->clean_out.data + session->clean_out.used,
sizeof(session->clean_out.data) - session->clean_out.used);
if (ret > 0) {
session->clean_out.used += ret;
return 1;
}
if (!tls_log_io_error(request, session, ret, "Failed in SSL_read")) return 0;
/*
* This only occurs once per session, where calling
* SSL_read updates the state of the SSL session, setting
* this flag to true.
*
* Callbacks provide enough info so we don't need to
* print debug statements when the handshake is in other
* states.
*/
if (SSL_is_init_finished(session->ssl)) {
SSL_CIPHER const *cipher;
VALUE_PAIR *vp;
char const *str_version;
char cipher_desc[256], cipher_desc_clean[256];
char *p = cipher_desc, *q = cipher_desc_clean;
cipher = SSL_get_current_cipher(session->ssl);
SSL_CIPHER_description(cipher, cipher_desc, sizeof(cipher_desc));
/*
* Cleanup the output from OpenSSL
* Seems to print info in a tabular format.
*/
while (*p != '\0') {
if (isspace(*p)) {
*q++ = *p;
while (isspace(*++p));
continue;
}
*q++ = *p++;
}
*q = '\0';
RDEBUG2("Cipher suite: %s", cipher_desc_clean);
vp = fr_pair_afrom_num(request->state_ctx, 0, FR_TLS_SESSION_CIPHER_SUITE);
if (vp) {
fr_pair_value_strcpy(vp, SSL_CIPHER_get_name(cipher));
fr_pair_add(&request->state, vp);
RDEBUG2(" &session-state:TLS-Session-Cipher-Suite := \"%s\"", vp->vp_strvalue);
}
switch (session->info.version) {
case SSL2_VERSION:
str_version = "SSL 2.0";
break;
case SSL3_VERSION:
str_version = "SSL 3.0";
break;
case TLS1_VERSION:
str_version = "TLS 1.0";
break;
#ifdef TLS1_1_VERSION
case TLS1_1_VERSION:
str_version = "TLS 1.1";
break;
#endif
#ifdef TLS1_2_VERSION
case TLS1_2_VERSION:
str_version = "TLS 1.2";
break;
#endif
#ifdef TLS1_3_VERSON
case TLS1_3_VERSION:
str_version = "TLS 1.3";
break;
#endif
default:
str_version = "UNKNOWN";
break;
}
vp = fr_pair_afrom_num(request->state_ctx, 0, FR_TLS_SESSION_VERSION);
if (vp) {
fr_pair_value_strcpy(vp, str_version);
fr_pair_add(&request->state, vp);
RDEBUG2(" &session-state:TLS-Session-Version := \"%s\"", str_version);
}
#if OPENSSL_VERSION_NUMBER >= 0x10001000L
/*
* Cache the SSL_SESSION pointer.
*
* Which contains all the data we need for session resumption.
*/
if (!session->ssl_session) {
session->ssl_session = SSL_get_session(session->ssl);
if (!session->ssl_session) {
REDEBUG("Failed getting TLS session");
return 0;
}
}
if (RDEBUG_ENABLED3) {
BIO *ssl_log = BIO_new(BIO_s_mem());
if (ssl_log) {
if (SSL_SESSION_print(ssl_log, session->ssl_session) == 1) {
SSL_DRAIN_ERROR_QUEUE(RDEBUG3, "", ssl_log);
} else {
RDEBUG3("Failed retrieving session data");
}
BIO_free(ssl_log);
}
}
#endif
/*
* Session was resumed, add attribute to mark it as such.
*/
if (SSL_session_reused(session->ssl)) {
/*
* Mark the request as resumed.
*/
MEM(pair_update_request(&vp, attr_eap_session_resumed) >= 0);
vp->vp_bool = true;
}
}
/*
* Get data to pack and send back to the TLS peer.
*/
ret = BIO_ctrl_pending(session->from_ssl);
if (ret > 0) {
ret = BIO_read(session->from_ssl, session->dirty_out.data,
sizeof(session->dirty_out.data));
if (ret > 0) {
session->dirty_out.used = ret;
} else if (BIO_should_retry(session->from_ssl)) {
record_init(&session->dirty_in);
RDEBUG2("Asking for more data in tunnel");
return 1;
} else {
tls_log_error(NULL, NULL);
record_init(&session->dirty_in);
return 0;
}
} else {
/* Its clean application data, do whatever we want */
record_init(&session->clean_out);
}
/*
* W would prefer to latch on info.content_type but
* (I think its...) tls_session_msg_cb() updates it
* after the call to tls_session_handshake_alert()
*/
if (session->handshake_alert.level) {
/*
* FIXME RFC 4851 section 3.6.1 - peer might ACK alert and include a restarted ClientHello
* which eap_tls_session_status() will fail on
*/
session->info.content_type = SSL3_RT_ALERT;
session->dirty_out.data[0] = session->info.content_type;
session->dirty_out.data[1] = 3;
session->dirty_out.data[2] = 1;
session->dirty_out.data[3] = 0;
session->dirty_out.data[4] = 2;
session->dirty_out.data[5] = session->handshake_alert.level;
session->dirty_out.data[6] = session->handshake_alert.description;
session->dirty_out.used = 7;
session->handshake_alert.level = 0;
}
/* We are done with dirty_in, reinitialize it */
record_init(&session->dirty_in);
return 1;
}
/*
* given a radius request with an EAP-SIM body, decode it into TLV pairs
*
* return value is true if it succeeded, false if there was something
* wrong and the packet should be discarded.
*
*/
int unmap_eapsim_basictypes(RADIUS_PACKET *r,
uint8_t *attr, unsigned int attrlen)
{
VALUE_PAIR *newvp;
int eapsim_attribute;
unsigned int eapsim_len;
int es_attribute_count;
es_attribute_count = 0;
/* big enough to have even a single attribute */
if (attrlen < 5) {
ERROR("eap: EAP-Sim attribute too short: %d < 5", attrlen);
return 0;
}
newvp = fr_pair_afrom_num(r, PW_EAP_SIM_SUBTYPE, 0);
if (!newvp) {
return 0;
}
newvp->vp_integer = attr[0];
newvp->vp_length = 1;
fr_pair_add(&(r->vps), newvp);
attr += 3;
attrlen -= 3;
/* now, loop processing each attribute that we find */
while(attrlen > 0) {
uint8_t *p;
if(attrlen < 2) {
ERROR("eap: EAP-Sim attribute %d too short: %d < 2", es_attribute_count, attrlen);
return 0;
}
eapsim_attribute = attr[0];
eapsim_len = attr[1] * 4;
if (eapsim_len > attrlen) {
ERROR("eap: EAP-Sim attribute %d (no.%d) has length longer than data (%d > %d)",
eapsim_attribute, es_attribute_count, eapsim_len, attrlen);
return 0;
}
if(eapsim_len > MAX_STRING_LEN) {
eapsim_len = MAX_STRING_LEN;
}
if (eapsim_len < 2) {
ERROR("eap: EAP-Sim attribute %d (no.%d) has length too small", eapsim_attribute,
es_attribute_count);
return 0;
}
newvp = fr_pair_afrom_num(r, eapsim_attribute+PW_EAP_SIM_BASE, 0);
newvp->vp_length = eapsim_len-2;
newvp->vp_octets = p = talloc_array(newvp, uint8_t, newvp->vp_length);
memcpy(p, &attr[2], eapsim_len-2);
fr_pair_add(&(r->vps), newvp);
newvp = NULL;
/* advance pointers, decrement length */
attr += eapsim_len;
attrlen -= eapsim_len;
es_attribute_count++;
}
return 1;
}
