564 lines
15 KiB
C
564 lines
15 KiB
C
/*
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* WPA Supplicant / EAP-PSK (draft-bersani-eap-psk-05.txt)
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* Copyright (c) 2004-2005, Jouni Malinen <jkmaline@cc.hut.fi>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* Alternatively, this software may be distributed under the terms of BSD
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* license.
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*
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* See README and COPYING for more details.
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*/
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include "common.h"
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#include "eap_i.h"
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#include "wpa_supplicant.h"
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#include "config_ssid.h"
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#include "md5.h"
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#include "aes_wrap.h"
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/* draft-bersani-eap-psk-03.txt mode. This is retained for interop testing and
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* will be removed once an AS that supports draft5 becomes available. */
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#define EAP_PSK_DRAFT3
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#define EAP_PSK_RAND_LEN 16
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#define EAP_PSK_MAC_LEN 16
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#define EAP_PSK_TEK_LEN 16
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#define EAP_PSK_MSK_LEN 64
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#define EAP_PSK_R_FLAG_CONT 1
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#define EAP_PSK_R_FLAG_DONE_SUCCESS 2
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#define EAP_PSK_R_FLAG_DONE_FAILURE 3
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/* EAP-PSK First Message (AS -> Supplicant) */
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struct eap_psk_hdr_1 {
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u8 code;
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u8 identifier;
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u16 length; /* including code, identifier, and length */
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u8 type; /* EAP_TYPE_PSK */
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#ifndef EAP_PSK_DRAFT3
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u8 flags;
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#endif /* EAP_PSK_DRAFT3 */
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u8 rand_s[EAP_PSK_RAND_LEN];
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#ifndef EAP_PSK_DRAFT3
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/* Followed by variable length ID_S */
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#endif /* EAP_PSK_DRAFT3 */
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} __attribute__ ((packed));
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/* EAP-PSK Second Message (Supplicant -> AS) */
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struct eap_psk_hdr_2 {
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u8 code;
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u8 identifier;
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u16 length; /* including code, identifier, and length */
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u8 type; /* EAP_TYPE_PSK */
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#ifndef EAP_PSK_DRAFT3
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u8 flags;
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u8 rand_s[EAP_PSK_RAND_LEN];
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#endif /* EAP_PSK_DRAFT3 */
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u8 rand_p[EAP_PSK_RAND_LEN];
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u8 mac_p[EAP_PSK_MAC_LEN];
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/* Followed by variable length ID_P */
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} __attribute__ ((packed));
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/* EAP-PSK Third Message (AS -> Supplicant) */
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struct eap_psk_hdr_3 {
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u8 code;
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u8 identifier;
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u16 length; /* including code, identifier, and length */
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u8 type; /* EAP_TYPE_PSK */
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#ifndef EAP_PSK_DRAFT3
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u8 flags;
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u8 rand_s[EAP_PSK_RAND_LEN];
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#endif /* EAP_PSK_DRAFT3 */
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u8 mac_s[EAP_PSK_MAC_LEN];
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/* Followed by variable length PCHANNEL */
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} __attribute__ ((packed));
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/* EAP-PSK Fourth Message (Supplicant -> AS) */
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struct eap_psk_hdr_4 {
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u8 code;
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u8 identifier;
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u16 length; /* including code, identifier, and length */
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u8 type; /* EAP_TYPE_PSK */
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#ifndef EAP_PSK_DRAFT3
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u8 flags;
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u8 rand_s[EAP_PSK_RAND_LEN];
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#endif /* EAP_PSK_DRAFT3 */
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/* Followed by variable length PCHANNEL */
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} __attribute__ ((packed));
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struct eap_psk_data {
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enum { PSK_INIT, PSK_MAC_SENT, PSK_DONE } state;
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u8 rand_s[EAP_PSK_RAND_LEN];
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u8 rand_p[EAP_PSK_RAND_LEN];
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u8 ak[16], kdk[16], tek[EAP_PSK_TEK_LEN];
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u8 *id_s, *id_p;
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size_t id_s_len, id_p_len;
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u8 key_data[EAP_PSK_MSK_LEN];
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};
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#define aes_block_size 16
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static void eap_psk_key_setup(const u8 *psk, u8 *ak, u8 *kdk)
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{
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memset(ak, 0, aes_block_size);
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aes_128_encrypt_block(psk, ak, ak);
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memcpy(kdk, ak, aes_block_size);
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ak[aes_block_size - 1] ^= 0x01;
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kdk[aes_block_size - 1] ^= 0x02;
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aes_128_encrypt_block(psk, ak, ak);
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aes_128_encrypt_block(psk, kdk, kdk);
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}
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static void eap_psk_derive_keys(const u8 *kdk, const u8 *rb, u8 *tek, u8 *msk)
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{
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u8 hash[aes_block_size];
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u8 counter = 1;
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int i;
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aes_128_encrypt_block(kdk, rb, hash);
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hash[aes_block_size - 1] ^= counter;
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aes_128_encrypt_block(kdk, hash, tek);
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hash[aes_block_size - 1] ^= counter;
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counter++;
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for (i = 0; i < EAP_PSK_MSK_LEN / aes_block_size; i++) {
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hash[aes_block_size - 1] ^= counter;
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aes_128_encrypt_block(kdk, hash, &msk[i * aes_block_size]);
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hash[aes_block_size - 1] ^= counter;
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counter++;
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}
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}
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static void * eap_psk_init(struct eap_sm *sm)
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{
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struct wpa_ssid *config = eap_get_config(sm);
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struct eap_psk_data *data;
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if (config == NULL || !config->eappsk) {
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wpa_printf(MSG_INFO, "EAP-PSK: pre-shared key not configured");
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return NULL;
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}
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data = malloc(sizeof(*data));
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if (data == NULL)
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return NULL;
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memset(data, 0, sizeof(*data));
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eap_psk_key_setup(config->eappsk, data->ak, data->kdk);
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wpa_hexdump_key(MSG_DEBUG, "EAP-PSK: AK", data->ak, 16);
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wpa_hexdump_key(MSG_DEBUG, "EAP-PSK: KDK", data->kdk, 16);
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data->state = PSK_INIT;
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if (config->nai) {
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data->id_p = malloc(config->nai_len);
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if (data->id_p)
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memcpy(data->id_p, config->nai, config->nai_len);
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data->id_p_len = config->nai_len;
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}
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if (data->id_p == NULL) {
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wpa_printf(MSG_INFO, "EAP-PSK: could not get own identity");
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free(data);
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return NULL;
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}
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#ifdef EAP_PSK_DRAFT3
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if (config->server_nai) {
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data->id_s = malloc(config->server_nai_len);
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if (data->id_s)
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memcpy(data->id_s, config->server_nai,
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config->server_nai_len);
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data->id_s_len = config->server_nai_len;
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}
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if (data->id_s == NULL) {
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wpa_printf(MSG_INFO, "EAP-PSK: could not get server identity");
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free(data->id_p);
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free(data);
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return NULL;
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}
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#endif /* EAP_PSK_DRAFT3 */
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return data;
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}
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static void eap_psk_deinit(struct eap_sm *sm, void *priv)
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{
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struct eap_psk_data *data = priv;
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free(data->id_s);
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free(data->id_p);
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free(data);
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}
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static u8 * eap_psk_process_1(struct eap_sm *sm, struct eap_psk_data *data,
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struct eap_method_ret *ret,
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u8 *reqData, size_t reqDataLen,
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size_t *respDataLen)
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{
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struct eap_psk_hdr_1 *hdr1;
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struct eap_psk_hdr_2 *hdr2;
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u8 *resp, *buf, *pos;
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size_t buflen;
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wpa_printf(MSG_DEBUG, "EAP-PSK: in INIT state");
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hdr1 = (struct eap_psk_hdr_1 *) reqData;
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if (reqDataLen < sizeof(*hdr1) ||
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be_to_host16(hdr1->length) < sizeof(*hdr1) ||
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be_to_host16(hdr1->length) > reqDataLen) {
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wpa_printf(MSG_INFO, "EAP-PSK: Invalid first message "
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"length (%lu %d; expected %lu or more)",
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(unsigned long) reqDataLen,
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be_to_host16(hdr1->length),
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(unsigned long) sizeof(*hdr1));
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ret->ignore = TRUE;
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return NULL;
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}
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#ifndef EAP_PSK_DRAFT3
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wpa_printf(MSG_DEBUG, "EAP-PSK: Flags=0x%x", hdr1->flags);
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if ((hdr1->flags & 0x03) != 0) {
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wpa_printf(MSG_INFO, "EAP-PSK: Unexpected T=%d (expected 0)",
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hdr1->flags & 0x03);
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ret->methodState = METHOD_DONE;
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ret->decision = DECISION_FAIL;
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return NULL;
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}
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#endif /* EAP_PSK_DRAFT3 */
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wpa_hexdump(MSG_DEBUG, "EAP-PSK: RAND_S", hdr1->rand_s,
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EAP_PSK_RAND_LEN);
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memcpy(data->rand_s, hdr1->rand_s, EAP_PSK_RAND_LEN);
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#ifndef EAP_PSK_DRAFT3
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free(data->id_s);
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data->id_s_len = be_to_host16(hdr1->length) - sizeof(*hdr1);
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data->id_s = malloc(data->id_s_len);
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if (data->id_s == NULL) {
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wpa_printf(MSG_ERROR, "EAP-PSK: Failed to allocate memory for "
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"ID_S (len=%d)", data->id_s_len);
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ret->ignore = TRUE;
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return NULL;
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}
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memcpy(data->id_s, (u8 *) (hdr1 + 1), data->id_s_len);
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wpa_hexdump_ascii(MSG_DEBUG, "EAP-PSK: ID_S",
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data->id_s, data->id_s_len);
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#endif /* EAP_PSK_DRAFT3 */
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if (hostapd_get_rand(data->rand_p, EAP_PSK_RAND_LEN)) {
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wpa_printf(MSG_ERROR, "EAP-PSK: Failed to get random data");
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ret->ignore = TRUE;
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return NULL;
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}
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*respDataLen = sizeof(*hdr2) + data->id_p_len;
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resp = malloc(*respDataLen);
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if (resp == NULL)
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return NULL;
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hdr2 = (struct eap_psk_hdr_2 *) resp;
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hdr2->code = EAP_CODE_RESPONSE;
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hdr2->identifier = hdr1->identifier;
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hdr2->length = host_to_be16(*respDataLen);
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hdr2->type = EAP_TYPE_PSK;
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#ifndef EAP_PSK_DRAFT3
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hdr2->flags = 1; /* T=1 */
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memcpy(hdr2->rand_s, hdr1->rand_s, EAP_PSK_RAND_LEN);
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#endif /* EAP_PSK_DRAFT3 */
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memcpy(hdr2->rand_p, data->rand_p, EAP_PSK_RAND_LEN);
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memcpy((u8 *) (hdr2 + 1), data->id_p, data->id_p_len);
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/* MAC_P = OMAC1-AES-128(AK, ID_P||ID_S||RAND_S||RAND_P) */
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buflen = data->id_p_len + data->id_s_len + 2 * EAP_PSK_RAND_LEN;
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buf = malloc(buflen);
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if (buf == NULL) {
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free(resp);
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return NULL;
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}
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memcpy(buf, data->id_p, data->id_p_len);
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pos = buf + data->id_p_len;
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memcpy(pos, data->id_s, data->id_s_len);
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pos += data->id_s_len;
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memcpy(pos, data->rand_s, EAP_PSK_RAND_LEN);
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pos += EAP_PSK_RAND_LEN;
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memcpy(pos, data->rand_p, EAP_PSK_RAND_LEN);
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omac1_aes_128(data->ak, buf, buflen, hdr2->mac_p);
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free(buf);
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wpa_hexdump(MSG_DEBUG, "EAP-PSK: RAND_P", hdr2->rand_p,
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EAP_PSK_RAND_LEN);
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wpa_hexdump(MSG_DEBUG, "EAP-PSK: MAC_P", hdr2->mac_p, EAP_PSK_MAC_LEN);
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wpa_hexdump_ascii(MSG_DEBUG, "EAP-PSK: ID_P",
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(u8 *) (hdr2 + 1), data->id_p_len);
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data->state = PSK_MAC_SENT;
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return resp;
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}
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static u8 * eap_psk_process_3(struct eap_sm *sm, struct eap_psk_data *data,
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struct eap_method_ret *ret,
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u8 *reqData, size_t reqDataLen,
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size_t *respDataLen)
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{
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struct eap_psk_hdr_3 *hdr3;
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struct eap_psk_hdr_4 *hdr4;
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u8 *resp, *buf, *pchannel, *tag, *msg, nonce[16];
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u8 mac[EAP_PSK_MAC_LEN];
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size_t buflen, left;
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int failed = 0;
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wpa_printf(MSG_DEBUG, "EAP-PSK: in MAC_SENT state");
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hdr3 = (struct eap_psk_hdr_3 *) reqData;
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left = be_to_host16(hdr3->length);
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if (left < sizeof(*hdr3) || reqDataLen < left) {
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wpa_printf(MSG_INFO, "EAP-PSK: Invalid third message "
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"length (%lu %d; expected %lu)",
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(unsigned long) reqDataLen,
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be_to_host16(hdr3->length),
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(unsigned long) sizeof(*hdr3));
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ret->ignore = TRUE;
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return NULL;
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}
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left -= sizeof(*hdr3);
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pchannel = (u8 *) (hdr3 + 1);
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#ifndef EAP_PSK_DRAFT3
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wpa_printf(MSG_DEBUG, "EAP-PSK: Flags=0x%x", hdr3->flags);
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if ((hdr3->flags & 0x03) != 2) {
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wpa_printf(MSG_INFO, "EAP-PSK: Unexpected T=%d (expected 2)",
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hdr3->flags & 0x03);
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ret->methodState = METHOD_DONE;
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ret->decision = DECISION_FAIL;
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return NULL;
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}
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wpa_hexdump(MSG_DEBUG, "EAP-PSK: RAND_S", hdr3->rand_s,
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EAP_PSK_RAND_LEN);
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/* TODO: would not need to store RAND_S since it is available in this
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* message. For now, since we store this anyway, verify that it matches
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* with whatever the server is sending. */
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if (memcmp(hdr3->rand_s, data->rand_s, EAP_PSK_RAND_LEN) != 0) {
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wpa_printf(MSG_ERROR, "EAP-PSK: RAND_S did not match");
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ret->methodState = METHOD_DONE;
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ret->decision = DECISION_FAIL;
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return NULL;
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}
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#endif /* EAP_PSK_DRAFT3 */
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wpa_hexdump(MSG_DEBUG, "EAP-PSK: MAC_S", hdr3->mac_s, EAP_PSK_MAC_LEN);
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wpa_hexdump(MSG_DEBUG, "EAP-PSK: PCHANNEL", pchannel, left);
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if (left < 4 + 16 + 1) {
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wpa_printf(MSG_INFO, "EAP-PSK: Too short PCHANNEL data in "
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"third message (len=%lu, expected 21)",
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(unsigned long) left);
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ret->ignore = TRUE;
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return NULL;
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}
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/* MAC_S = OMAC1-AES-128(AK, ID_S||RAND_P) */
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buflen = data->id_s_len + EAP_PSK_RAND_LEN;
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buf = malloc(buflen);
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if (buf == NULL)
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return NULL;
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memcpy(buf, data->id_s, data->id_s_len);
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memcpy(buf + data->id_s_len, data->rand_p, EAP_PSK_RAND_LEN);
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omac1_aes_128(data->ak, buf, buflen, mac);
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free(buf);
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if (memcmp(mac, hdr3->mac_s, EAP_PSK_MAC_LEN) != 0) {
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wpa_printf(MSG_WARNING, "EAP-PSK: Invalid MAC_S in third "
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"message");
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ret->methodState = METHOD_DONE;
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ret->decision = DECISION_FAIL;
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return NULL;
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}
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wpa_printf(MSG_DEBUG, "EAP-PSK: MAC_S verified successfully");
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eap_psk_derive_keys(data->kdk, data->rand_p, data->tek,
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data->key_data);
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wpa_hexdump_key(MSG_DEBUG, "EAP-PSK: TEK", data->tek, EAP_PSK_TEK_LEN);
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wpa_hexdump_key(MSG_DEBUG, "EAP-PSK: MSK", data->key_data,
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EAP_PSK_MSK_LEN);
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memset(nonce, 0, 12);
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memcpy(nonce + 12, pchannel, 4);
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pchannel += 4;
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left -= 4;
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tag = pchannel;
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pchannel += 16;
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left -= 16;
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msg = pchannel;
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wpa_hexdump(MSG_MSGDUMP, "EAP-PSK: PCHANNEL - nonce",
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nonce, sizeof(nonce));
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wpa_hexdump(MSG_MSGDUMP, "EAP-PSK: PCHANNEL - hdr", reqData, 5);
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wpa_hexdump(MSG_MSGDUMP, "EAP-PSK: PCHANNEL - cipher msg", msg, left);
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#ifdef EAP_PSK_DRAFT3
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if (aes_128_eax_decrypt(data->tek, nonce, sizeof(nonce),
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reqData, 5, msg, left, tag))
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#else /* EAP_PSK_DRAFT3 */
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if (aes_128_eax_decrypt(data->tek, nonce, sizeof(nonce),
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reqData, 22, msg, left, tag))
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#endif /* EAP_PSK_DRAFT3 */
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{
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wpa_printf(MSG_WARNING, "EAP-PSK: PCHANNEL decryption failed");
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return NULL;
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}
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wpa_hexdump(MSG_DEBUG, "EAP-PSK: Decrypted PCHANNEL message",
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msg, left);
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/* Verify R flag */
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switch (msg[0] >> 6) {
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case EAP_PSK_R_FLAG_CONT:
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wpa_printf(MSG_DEBUG, "EAP-PSK: R flag - CONT - unsupported");
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return NULL;
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case EAP_PSK_R_FLAG_DONE_SUCCESS:
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wpa_printf(MSG_DEBUG, "EAP-PSK: R flag - DONE_SUCCESS");
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break;
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case EAP_PSK_R_FLAG_DONE_FAILURE:
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wpa_printf(MSG_DEBUG, "EAP-PSK: R flag - DONE_FAILURE");
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wpa_printf(MSG_INFO, "EAP-PSK: Authentication server rejected "
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"authentication");
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failed = 1;
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break;
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|
}
|
|
|
|
*respDataLen = sizeof(*hdr4) + 4 + 16 + 1;
|
|
resp = malloc(*respDataLen);
|
|
if (resp == NULL)
|
|
return NULL;
|
|
hdr4 = (struct eap_psk_hdr_4 *) resp;
|
|
hdr4->code = EAP_CODE_RESPONSE;
|
|
hdr4->identifier = hdr3->identifier;
|
|
hdr4->length = host_to_be16(*respDataLen);
|
|
hdr4->type = EAP_TYPE_PSK;
|
|
#ifndef EAP_PSK_DRAFT3
|
|
hdr4->flags = 3; /* T=3 */
|
|
memcpy(hdr4->rand_s, hdr3->rand_s, EAP_PSK_RAND_LEN);
|
|
#endif /* EAP_PSK_DRAFT3 */
|
|
pchannel = (u8 *) (hdr4 + 1);
|
|
|
|
/* nonce++ */
|
|
inc_byte_array(nonce, sizeof(nonce));
|
|
memcpy(pchannel, nonce + 12, 4);
|
|
|
|
pchannel[4 + 16] = EAP_PSK_R_FLAG_DONE_SUCCESS << 6;
|
|
|
|
wpa_hexdump(MSG_DEBUG, "EAP-PSK: reply message (plaintext)",
|
|
pchannel + 4 + 16, 1);
|
|
#ifdef EAP_PSK_DRAFT3
|
|
aes_128_eax_encrypt(data->tek, nonce, sizeof(nonce), resp, 5,
|
|
pchannel + 4 + 16, 1, pchannel + 4);
|
|
#else /* EAP_PSK_DRAFT3 */
|
|
aes_128_eax_encrypt(data->tek, nonce, sizeof(nonce), resp, 22,
|
|
pchannel + 4 + 16, 1, pchannel + 4);
|
|
#endif /* EAP_PSK_DRAFT3 */
|
|
wpa_hexdump(MSG_DEBUG, "EAP-PSK: reply message (PCHANNEL)",
|
|
pchannel, 4 + 16 + 1);
|
|
|
|
wpa_printf(MSG_DEBUG, "EAP-PSK: Completed %ssuccessfully",
|
|
failed ? "un" : "");
|
|
data->state = PSK_DONE;
|
|
ret->methodState = METHOD_DONE;
|
|
ret->decision = failed ? DECISION_FAIL : DECISION_UNCOND_SUCC;
|
|
|
|
return resp;
|
|
}
|
|
|
|
|
|
static u8 * eap_psk_process(struct eap_sm *sm, void *priv,
|
|
struct eap_method_ret *ret,
|
|
u8 *reqData, size_t reqDataLen,
|
|
size_t *respDataLen)
|
|
{
|
|
struct eap_psk_data *data = priv;
|
|
struct eap_hdr *req;
|
|
u8 *pos, *resp = NULL;
|
|
size_t len;
|
|
|
|
req = (struct eap_hdr *) reqData;
|
|
pos = (u8 *) (req + 1);
|
|
if (reqDataLen < sizeof(*req) + 1 || *pos != EAP_TYPE_PSK ||
|
|
(len = be_to_host16(req->length)) > reqDataLen) {
|
|
wpa_printf(MSG_INFO, "EAP-PSK: Invalid frame");
|
|
ret->ignore = TRUE;
|
|
return NULL;
|
|
}
|
|
|
|
ret->ignore = FALSE;
|
|
ret->methodState = METHOD_CONT;
|
|
ret->decision = DECISION_FAIL;
|
|
ret->allowNotifications = TRUE;
|
|
|
|
switch (data->state) {
|
|
case PSK_INIT:
|
|
resp = eap_psk_process_1(sm, data, ret, reqData, len,
|
|
respDataLen);
|
|
break;
|
|
case PSK_MAC_SENT:
|
|
resp = eap_psk_process_3(sm, data, ret, reqData, len,
|
|
respDataLen);
|
|
break;
|
|
case PSK_DONE:
|
|
wpa_printf(MSG_DEBUG, "EAP-PSK: in DONE state - ignore "
|
|
"unexpected message");
|
|
ret->ignore = TRUE;
|
|
return NULL;
|
|
}
|
|
|
|
if (ret->methodState == METHOD_DONE) {
|
|
ret->allowNotifications = FALSE;
|
|
}
|
|
|
|
return resp;
|
|
}
|
|
|
|
|
|
static Boolean eap_psk_isKeyAvailable(struct eap_sm *sm, void *priv)
|
|
{
|
|
struct eap_psk_data *data = priv;
|
|
return data->state == PSK_DONE;
|
|
}
|
|
|
|
|
|
static u8 * eap_psk_getKey(struct eap_sm *sm, void *priv, size_t *len)
|
|
{
|
|
struct eap_psk_data *data = priv;
|
|
u8 *key;
|
|
|
|
if (data->state != PSK_DONE)
|
|
return NULL;
|
|
|
|
key = malloc(EAP_PSK_MSK_LEN);
|
|
if (key == NULL)
|
|
return NULL;
|
|
|
|
*len = EAP_PSK_MSK_LEN;
|
|
memcpy(key, data->key_data, EAP_PSK_MSK_LEN);
|
|
|
|
return key;
|
|
}
|
|
|
|
|
|
const struct eap_method eap_method_psk =
|
|
{
|
|
.method = EAP_TYPE_PSK,
|
|
.name = "PSK",
|
|
.init = eap_psk_init,
|
|
.deinit = eap_psk_deinit,
|
|
.process = eap_psk_process,
|
|
.isKeyAvailable = eap_psk_isKeyAvailable,
|
|
.getKey = eap_psk_getKey,
|
|
};
|