720 lines
17 KiB
C
720 lines
17 KiB
C
/*
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*
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* Wireless daemon for Linux
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*
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* Copyright (C) 2013-2014 Intel Corporation. All rights reserved.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*
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*/
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif
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#include <string.h>
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#include <stdio.h>
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#include <errno.h>
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#include <ell/ell.h>
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#include <ell/tls-private.h>
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#include "eap.h"
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struct eap_ttls_state {
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char *ca_cert;
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char *client_cert;
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char *client_key;
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char *passphrase;
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struct l_tls *tls;
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uint8_t *rx_pkt_buf;
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size_t rx_pkt_received, rx_pkt_len;
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uint8_t *tx_pkt_buf;
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size_t tx_pkt_len, tx_pkt_capacity, tx_pkt_offset;
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uint8_t *avp_buf;
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size_t avp_received, avp_capacity;
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bool phase1_completed;
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bool completed;
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struct eap_state *eap;
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uint8_t negotiated_version;
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};
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static void eap_ttls_free(struct eap_state *eap)
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{
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struct eap_ttls_state *ttls = eap_get_data(eap);
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eap_set_data(eap, NULL);
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l_free(ttls->ca_cert);
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l_free(ttls->client_cert);
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l_free(ttls->client_key);
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l_free(ttls->passphrase);
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if (ttls->rx_pkt_buf) {
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l_free(ttls->rx_pkt_buf);
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ttls->rx_pkt_buf = NULL;
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}
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if (ttls->tx_pkt_buf) {
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l_free(ttls->tx_pkt_buf);
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ttls->tx_pkt_buf = NULL;
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ttls->tx_pkt_capacity = 0;
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ttls->tx_pkt_len = 0;
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}
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if (ttls->avp_buf) {
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l_free(ttls->avp_buf);
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ttls->avp_buf = NULL;
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ttls->avp_received = 0;
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}
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if (ttls->eap) {
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eap_free(ttls->eap);
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ttls->eap = NULL;
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}
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if (ttls->tls) {
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l_tls_free(ttls->tls);
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ttls->tls = NULL;
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}
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l_free(ttls);
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}
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#define EAP_TTLS_RESPONSE_HEADER_LEN 10
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#define EAP_TTLS_FLAG_L (1 << 7)
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#define EAP_TTLS_FLAG_M (1 << 6)
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#define EAP_TTLS_FLAG_S (1 << 5)
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#define EAP_TTLS_FLAG_MASK \
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(EAP_TTLS_FLAG_L | EAP_TTLS_FLAG_M | EAP_TTLS_FLAG_S)
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static uint8_t *eap_ttls_tx_buf_reserve(struct eap_ttls_state *ttls,
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size_t size)
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{
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int offset = ttls->tx_pkt_offset + ttls->tx_pkt_len;
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size_t end_offset = offset + size;
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ttls->tx_pkt_len += size;
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if (end_offset > ttls->tx_pkt_capacity) {
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ttls->tx_pkt_capacity = end_offset + 1024;
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ttls->tx_pkt_buf =
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l_realloc(ttls->tx_pkt_buf, ttls->tx_pkt_capacity);
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}
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return ttls->tx_pkt_buf + offset;
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}
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static void eap_ttls_tx_cb(const uint8_t *data, size_t len, void *user_data)
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{
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struct eap_state *eap = user_data;
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struct eap_ttls_state *ttls = eap_get_data(eap);
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memcpy(eap_ttls_tx_buf_reserve(ttls, len), data, len);
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}
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struct eap_ttls_avp {
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__be32 avp_code;
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uint8_t avp_flags;
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uint8_t avp_len[3];
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uint8_t data[0];
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} __attribute__ ((packed));
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#define EAP_TTLS_AVP_FLAG_V (1 << 7)
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#define EAP_TTLS_AVP_FLAG_M (1 << 6)
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#define RADIUS_AVP_EAP_MESSAGE 79
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static bool eap_ttls_handle_avp(struct eap_state *eap, struct eap_ttls_avp *avp)
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{
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struct eap_ttls_state *ttls = eap_get_data(eap);
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uint8_t *data;
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uint64_t code;
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size_t data_len;
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data = avp->data;
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data_len = ((avp->avp_len[0] << 16) |
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(avp->avp_len[1] << 8) |
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(avp->avp_len[2] << 0)) - sizeof(struct eap_ttls_avp);
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code = l_get_be32(&avp->avp_code);
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if (avp->avp_flags & EAP_TTLS_AVP_FLAG_V) {
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if (data_len < 4)
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goto avp_err;
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code |= (uint64_t) l_get_be32(data) << 32;
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data += 4;
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data_len -= 4;
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}
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switch (code) {
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/* EAP-Message attribute, actually defined in RFC2869 5.13 */
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case RADIUS_AVP_EAP_MESSAGE:
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if (!ttls->eap)
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goto avp_err;
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/* TODO: split if necessary */
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eap_rx_packet(ttls->eap, data, data_len);
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break;
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default:
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if (avp->avp_flags & EAP_TTLS_AVP_FLAG_M)
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goto avp_err;
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break;
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}
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return true;
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avp_err:
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l_tls_close(ttls->tls);
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return false;
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}
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static size_t avp_min_len(const uint8_t *buf, size_t len)
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{
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struct eap_ttls_avp *avp;
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if (len < sizeof(struct eap_ttls_avp))
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return sizeof(struct eap_ttls_avp);
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avp = (struct eap_ttls_avp *) buf;
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return (((avp->avp_len[0] << 16) |
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(avp->avp_len[1] << 8) |
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(avp->avp_len[2] << 0)) + 3) & ~3;
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}
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static void eap_ttls_data_cb(const uint8_t *data, size_t len, void *user_data)
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{
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struct eap_state *eap = user_data;
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struct eap_ttls_state *ttls = eap_get_data(eap);
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struct eap_ttls_avp *avp;
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size_t avp_len, chunk_len;
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/* Continue assembling the AVP that we have buffered */
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while (ttls->avp_received) {
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avp_len = avp_min_len(ttls->avp_buf, ttls->avp_received);
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chunk_len = avp_len - ttls->avp_received;
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if (chunk_len > len)
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chunk_len = len;
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if (ttls->avp_received + chunk_len > ttls->avp_capacity) {
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ttls->avp_capacity = avp_len;
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ttls->avp_buf = l_realloc(ttls->avp_buf,
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ttls->avp_capacity);
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}
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memcpy(ttls->avp_buf + ttls->avp_received, data, chunk_len);
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ttls->avp_received += chunk_len;
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if (avp_len > ttls->avp_received) /* Wait for more data */
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return;
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/* Do we have a full AVP or just the header */
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if (ttls->avp_received - chunk_len >=
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sizeof(struct eap_ttls_avp)) {
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ttls->avp_received = 0;
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avp = (struct eap_ttls_avp *) ttls->avp_buf;
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if (!eap_ttls_handle_avp(eap, avp))
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return;
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data += chunk_len;
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len -= chunk_len;
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}
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}
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/* Handle all the AVPs fully contained in the newly received data */
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while (len) {
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avp_len = avp_min_len(data, len);
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if (len < avp_len || len < sizeof(struct eap_ttls_avp))
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break;
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avp = (struct eap_ttls_avp *) data;
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if (!eap_ttls_handle_avp(eap, avp))
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return;
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data += avp_len;
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len -= avp_len;
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}
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if (!len)
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return;
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/* Store the remaining bytes */
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if (ttls->avp_capacity < len) {
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ttls->avp_capacity = avp_len;
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ttls->avp_buf = l_realloc(ttls->avp_buf, ttls->avp_capacity);
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}
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memcpy(ttls->avp_buf, data, len);
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ttls->avp_received = len;
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}
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static void eap_ttls_eap_tx_packet(const uint8_t *eap_data, size_t len,
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void *user_data)
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{
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struct eap_state *eap = user_data;
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struct eap_ttls_state *ttls = eap_get_data(eap);
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uint8_t buf[sizeof(struct eap_ttls_avp) + len + 3];
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struct eap_ttls_avp *avp = (struct eap_ttls_avp *) buf;
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size_t avp_len = sizeof(struct eap_ttls_avp) + len;
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l_put_be32(RADIUS_AVP_EAP_MESSAGE, &avp->avp_code);
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avp->avp_flags = EAP_TTLS_AVP_FLAG_M;
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avp->avp_len[0] = avp_len >> 16;
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avp->avp_len[1] = avp_len >> 8;
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avp->avp_len[2] = avp_len >> 0;
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memcpy(avp->data, eap_data, len);
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if (avp_len & 3)
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memset(avp->data + len, 0, 4 - (avp_len & 3));
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l_tls_write(ttls->tls, buf, (avp_len + 3) & ~3);
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}
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static void eap_ttls_eap_complete(enum eap_result result, void *user_data)
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{
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struct eap_state *eap = user_data;
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struct eap_ttls_state *ttls = eap_get_data(eap);
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uint8_t last_id;
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eap_save_last_id(ttls->eap, &last_id);
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/* Prepare for possible chained authentication */
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/* We currently have no way to configure the new instance */
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eap_free(ttls->eap);
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ttls->eap = eap_new(eap_ttls_eap_tx_packet,
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eap_ttls_eap_complete, eap);
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if (!ttls->eap) {
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ttls->completed = true;
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return;
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}
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/* Preserve the last_id as mandated by 11.3 */
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eap_restore_last_id(ttls->eap, last_id);
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}
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static void eap_ttls_ready_cb(const char *peer_identity, void *user_data)
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{
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struct eap_state *eap = user_data;
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struct eap_ttls_state *ttls = eap_get_data(eap);
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uint8_t msk_emsk[128];
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uint8_t seed[64];
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uint8_t packet[5] = { EAP_CODE_REQUEST, 0, 0, 5, EAP_TYPE_IDENTITY };
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/* TODO: if we have a CA certificate require non-NULL peer_identity */
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ttls->phase1_completed = true;
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/*
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* TTLSv0 seems to assume that the TLS handshake phase authenticates
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* the server to the client enough that the inner method success or
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* failure status doesn't matter as long as the server lets us in,
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* although in various places it says the client may also have a
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* specific policy.
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*/
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eap_method_success(eap);
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/* MSK, EMSK and challenge derivation */
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memcpy(seed + 0, ttls->tls->pending.client_random, 32);
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memcpy(seed + 32, ttls->tls->pending.server_random, 32);
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tls_prf_get_bytes(ttls->tls, L_CHECKSUM_SHA256, 32,
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ttls->tls->pending.master_secret,
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sizeof(ttls->tls->pending.master_secret),
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"ttls keying material", seed, 64,
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msk_emsk, 128);
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memset(seed, 0, 64);
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eap_set_key_material(eap, msk_emsk + 0, 64, msk_emsk + 64, 64,
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NULL, 0);
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/* Start the EAP negotiation */
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if (!ttls->eap) {
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ttls->eap = eap_new(eap_ttls_eap_tx_packet,
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eap_ttls_eap_complete, eap);
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if (!ttls->eap) {
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l_error("Could not create the TTLS inner EAP instance");
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goto err;
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}
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}
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/*
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* Consume a fake Request/Identity packet so that the EAP instance
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* starts with its Response/Identity right away.
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*/
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eap_rx_packet(ttls->eap, packet, sizeof(packet));
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return;
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err:
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l_tls_close(ttls->tls);
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}
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static void eap_ttls_disconnect_cb(enum l_tls_alert_desc reason,
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bool remote, void *user_data)
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{
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struct eap_state *eap = user_data;
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struct eap_ttls_state *ttls = eap_get_data(eap);
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ttls->completed = true;
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}
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static void eap_ttls_handle_request(struct eap_state *eap,
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const uint8_t *pkt, size_t len)
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{
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uint8_t flags;
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uint32_t total_len;
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struct eap_ttls_state *ttls = eap_get_data(eap);
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size_t fragment_len;
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uint8_t *tx_buf;
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if (len < 1) {
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l_error("EAP-TTLS request too short");
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goto err;
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}
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flags = pkt[0];
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pkt += 1;
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len -= 1;
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if (!(flags & EAP_TTLS_FLAG_S) &&
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(flags & 7) != ttls->negotiated_version) {
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l_error("Non-zero EAP-TTLS version: %i", flags & 7);
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goto err;
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}
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/* Check if we're expecting a fragment ACK */
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if (ttls->tx_pkt_len) {
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if ((flags & EAP_TTLS_FLAG_MASK) || len) {
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l_error("EAP-TTLS request is not an ACK");
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goto err;
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}
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/* Send next response fragment, prepend the 6-byte header */
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tx_buf = &ttls->tx_pkt_buf[ttls->tx_pkt_offset - 6];
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fragment_len = eap_get_mtu(eap) - 6;
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tx_buf[5] = EAP_TTLS_FLAG_M |
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ttls->negotiated_version; /* Flags */
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if (ttls->tx_pkt_len <= fragment_len) {
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fragment_len = ttls->tx_pkt_len;
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tx_buf[5] = ttls->negotiated_version; /* Flags */
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}
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eap_send_response(eap, EAP_TYPE_TTLS,
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tx_buf, fragment_len + 6);
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ttls->tx_pkt_len -= fragment_len;
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ttls->tx_pkt_offset += fragment_len;
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return;
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}
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/* Complain if S bit is not correct */
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if (!(flags & EAP_TTLS_FLAG_S) == !ttls->tls) {
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l_error("EAP-TTLS request S flag invalid");
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goto err;
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}
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/* Method can't be restarted */
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if ((flags & EAP_TTLS_FLAG_S) && ttls->completed) {
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l_error("EAP-TTLS start after completed");
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goto err;
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}
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if (flags & EAP_TTLS_FLAG_L) {
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if (len < 7) {
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l_error("EAP-TTLS request with L flag too short");
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goto err;
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}
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total_len = l_get_be32(pkt);
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pkt += 4;
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len -= 4;
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if (ttls->rx_pkt_buf) {
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l_error("EAP-TTLS request L flag invalid");
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l_free(ttls->rx_pkt_buf);
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ttls->rx_pkt_buf = NULL;
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goto err;
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}
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if (!(flags & EAP_TTLS_FLAG_M) && total_len != len) {
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l_error("EAP-TTLS request Length value invalid");
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goto err;
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}
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}
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if (!ttls->rx_pkt_buf && (flags & EAP_TTLS_FLAG_M)) {
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if (!(flags & EAP_TTLS_FLAG_L)) {
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l_error("EAP-TTLS requst 1st fragment with no length");
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goto err;
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}
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ttls->rx_pkt_buf = l_malloc(total_len);
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ttls->rx_pkt_len = total_len;
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ttls->rx_pkt_received = 0;
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}
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if (ttls->rx_pkt_buf) {
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if (
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((flags & EAP_TTLS_FLAG_M) &&
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ttls->rx_pkt_received + len >=
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ttls->rx_pkt_len) ||
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(!(flags & EAP_TTLS_FLAG_M) &&
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ttls->rx_pkt_received + len !=
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ttls->rx_pkt_len)) {
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l_error("EAP-TTLS request fragment length mismatch");
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l_free(ttls->rx_pkt_buf);
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ttls->rx_pkt_buf = NULL;
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goto err;
|
|
}
|
|
|
|
memcpy(ttls->rx_pkt_buf + ttls->rx_pkt_received, pkt, len);
|
|
ttls->rx_pkt_received += len;
|
|
}
|
|
|
|
if (flags & EAP_TTLS_FLAG_M) {
|
|
uint8_t buf[6];
|
|
|
|
/* Send an empty response as ACK */
|
|
buf[5] = 0;
|
|
eap_send_response(eap, EAP_TYPE_TTLS, buf, 6);
|
|
|
|
return;
|
|
}
|
|
|
|
if (ttls->rx_pkt_buf) {
|
|
pkt = ttls->rx_pkt_buf;
|
|
len = ttls->rx_pkt_len;
|
|
}
|
|
|
|
eap_ttls_tx_buf_reserve(ttls, EAP_TTLS_RESPONSE_HEADER_LEN);
|
|
ttls->tx_pkt_offset = ttls->tx_pkt_len;
|
|
ttls->tx_pkt_len = 0;
|
|
|
|
if (flags & EAP_TTLS_FLAG_S) {
|
|
ttls->tls = l_tls_new(false, eap_ttls_data_cb,
|
|
eap_ttls_tx_cb, eap_ttls_ready_cb,
|
|
eap_ttls_disconnect_cb, eap);
|
|
|
|
if (!ttls->tls) {
|
|
l_error("Creating a TLS instance failed");
|
|
goto err;
|
|
}
|
|
|
|
l_tls_set_auth_data(ttls->tls, ttls->client_cert,
|
|
ttls->client_key, ttls->passphrase);
|
|
|
|
if (ttls->ca_cert)
|
|
l_tls_set_cacert(ttls->tls, ttls->ca_cert);
|
|
|
|
/*
|
|
* RFC5281 section 9.1: "For all packets other than a
|
|
* Start packet, the Data field consists of the raw
|
|
* TLS message sequence or fragment thereof. For a
|
|
* Start packet, the Data field may optionally
|
|
* contain an AVP sequence."
|
|
* We ignore the unencrypted AVP sequence if there is
|
|
* any.
|
|
*/
|
|
len = 0;
|
|
}
|
|
|
|
/*
|
|
* Here we take advantage of knowing that ell will send all the
|
|
* records corresponding to the current handshake step from within
|
|
* the l_tls_handle_rx call because it doesn't use any other context
|
|
* such as timers - basic TLS specifies no timeouts. Otherwise we
|
|
* would need to analyze the record types in eap_ttls_tx_cb to decide
|
|
* when we're ready to send out a response.
|
|
*/
|
|
if (len)
|
|
l_tls_handle_rx(ttls->tls, pkt, len);
|
|
|
|
if (ttls->rx_pkt_buf) {
|
|
l_free(ttls->rx_pkt_buf);
|
|
ttls->rx_pkt_buf = NULL;
|
|
}
|
|
|
|
/*
|
|
* Note if ttls->completed && !eap->method_success we can send an empty
|
|
* response instead of passing the TLS alert.
|
|
*/
|
|
|
|
if (ttls->tx_pkt_len + 6 <= eap_get_mtu(eap)) {
|
|
/*
|
|
* Response fits in a single response packet, prepend the
|
|
* 6-byte header (no length) before the data.
|
|
*/
|
|
tx_buf = &ttls->tx_pkt_buf[ttls->tx_pkt_offset - 6];
|
|
|
|
tx_buf[5] = ttls->negotiated_version; /* Flags */
|
|
|
|
eap_send_response(eap, EAP_TYPE_TTLS,
|
|
tx_buf, ttls->tx_pkt_len + 6);
|
|
|
|
ttls->tx_pkt_len = 0;
|
|
} else {
|
|
/*
|
|
* Fragmentation needed, prepend the 10-byte header
|
|
* (4 EAP header + 2 response + 4 length) to build the
|
|
* initial fragment packet.
|
|
*/
|
|
tx_buf = &ttls->tx_pkt_buf[ttls->tx_pkt_offset - 10];
|
|
|
|
tx_buf[5] = EAP_TTLS_FLAG_L | EAP_TTLS_FLAG_M |
|
|
ttls->negotiated_version; /* Flags */
|
|
l_put_be32(ttls->tx_pkt_len, &tx_buf[6]);
|
|
|
|
fragment_len = eap_get_mtu(eap) - 10;
|
|
eap_send_response(eap, EAP_TYPE_TTLS,
|
|
tx_buf, fragment_len + 10);
|
|
|
|
ttls->tx_pkt_len -= fragment_len;
|
|
ttls->tx_pkt_offset += fragment_len;
|
|
}
|
|
|
|
if (ttls->completed) {
|
|
l_tls_free(ttls->tls);
|
|
ttls->tls = NULL;
|
|
|
|
if (ttls->eap) {
|
|
eap_free(ttls->eap);
|
|
ttls->eap = NULL;
|
|
}
|
|
}
|
|
|
|
return;
|
|
|
|
err:
|
|
ttls->completed = true;
|
|
|
|
l_tls_free(ttls->tls);
|
|
ttls->tls = NULL;
|
|
|
|
eap_method_error(eap);
|
|
}
|
|
|
|
static bool eap_ttls_load_settings(struct eap_state *eap,
|
|
struct l_settings *settings,
|
|
const char *prefix)
|
|
{
|
|
struct eap_ttls_state *ttls;
|
|
char setting[64];
|
|
|
|
ttls = l_new(struct eap_ttls_state, 1);
|
|
|
|
snprintf(setting, sizeof(setting), "%sTTLS-CACert", prefix);
|
|
ttls->ca_cert = l_strdup(l_settings_get_value(settings,
|
|
"Security", setting));
|
|
|
|
snprintf(setting, sizeof(setting), "%sTTLS-ClientCert", prefix);
|
|
ttls->client_cert = l_strdup(l_settings_get_value(settings,
|
|
"Security", setting));
|
|
|
|
snprintf(setting, sizeof(setting), "%sTTLS-ClientKey", prefix);
|
|
ttls->client_key = l_strdup(l_settings_get_value(settings,
|
|
"Security", setting));
|
|
|
|
snprintf(setting, sizeof(setting), "%sTTLS-ClientKeyPassphrase",
|
|
prefix);
|
|
ttls->passphrase = l_strdup(l_settings_get_value(settings,
|
|
"Security", setting));
|
|
|
|
if (!ttls->client_cert && ttls->client_key) {
|
|
l_error("Client key present but no client certificate");
|
|
goto err;
|
|
}
|
|
|
|
if (!ttls->client_key && ttls->passphrase) {
|
|
l_error("Passphrase present but no client private key");
|
|
goto err;
|
|
}
|
|
|
|
ttls->eap = eap_new(eap_ttls_eap_tx_packet,
|
|
eap_ttls_eap_complete, eap);
|
|
if (!ttls->eap) {
|
|
l_error("Could not create the TTLS inner EAP instance");
|
|
goto err;
|
|
}
|
|
|
|
snprintf(setting, sizeof(setting), "%sTTLS-Phase2-", prefix);
|
|
|
|
if (!eap_load_settings(ttls->eap, settings, setting)) {
|
|
eap_free(ttls->eap);
|
|
goto err;
|
|
}
|
|
|
|
eap_set_data(eap, ttls);
|
|
|
|
return true;
|
|
|
|
err:
|
|
l_free(ttls->ca_cert);
|
|
l_free(ttls->client_cert);
|
|
l_free(ttls->client_key);
|
|
l_free(ttls->passphrase);
|
|
l_free(ttls);
|
|
|
|
return false;
|
|
}
|
|
|
|
static struct eap_method eap_ttls = {
|
|
.request_type = EAP_TYPE_TTLS,
|
|
.exports_msk = true,
|
|
.name = "TTLS",
|
|
|
|
.free = eap_ttls_free,
|
|
.handle_request = eap_ttls_handle_request,
|
|
.load_settings = eap_ttls_load_settings,
|
|
};
|
|
|
|
static int eap_ttls_init(void)
|
|
{
|
|
l_debug("");
|
|
return eap_register_method(&eap_ttls);
|
|
}
|
|
|
|
static void eap_ttls_exit(void)
|
|
{
|
|
l_debug("");
|
|
eap_unregister_method(&eap_ttls);
|
|
}
|
|
|
|
EAP_METHOD_BUILTIN(eap_ttls, eap_ttls_init, eap_ttls_exit)
|