mirror of
https://git.kernel.org/pub/scm/network/wireless/iwd.git
synced 2024-12-28 12:12:32 +01:00
374b367ba4
The MIC length was hard coded to 16 bytes everywhere, and since several AKMs require larger MIC's (24/32) this needed to change. The main issue was that the MIC was hard coded to 16 bytes inside eapol_key. Instead of doing this, the MIC, key_data_length, and key_data elements were all bundled into key_data[0]. In order to retrieve the MIC, key_data_len, or key_data several macros were introduced which account for the MIC length provided. A consequence of this is that all the verify functions inside eapol now require the MIC length as a parameter because without it they cannot determine the byte offset of key_data or key_data_length. The MIC length for a given handshake is set inside the SM when starting EAPoL. This length is determined by the AKM for the handshake.
118 lines
3.3 KiB
C
118 lines
3.3 KiB
C
/*
|
|
*
|
|
* Wireless daemon for Linux
|
|
*
|
|
* Copyright (C) 2013-2014 Intel Corporation. All rights reserved.
|
|
*
|
|
* This library is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU Lesser General Public
|
|
* License as published by the Free Software Foundation; either
|
|
* version 2.1 of the License, or (at your option) any later version.
|
|
*
|
|
* This library is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* Lesser General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Lesser General Public
|
|
* License along with this library; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*
|
|
*/
|
|
|
|
#include <stdint.h>
|
|
#include <stdbool.h>
|
|
#include <asm/byteorder.h>
|
|
#include <linux/types.h>
|
|
|
|
enum eapol_protocol_version {
|
|
EAPOL_PROTOCOL_VERSION_2001 = 1,
|
|
EAPOL_PROTOCOL_VERSION_2004 = 2,
|
|
};
|
|
|
|
/*
|
|
* 802.1X-2010: Table 11-5—Descriptor Type value assignments
|
|
* The WPA key type of 254 comes from somewhere else. Seems it is a legacy
|
|
* value that might still be used by older implementations
|
|
*/
|
|
enum eapol_descriptor_type {
|
|
EAPOL_DESCRIPTOR_TYPE_RC4 = 1,
|
|
EAPOL_DESCRIPTOR_TYPE_80211 = 2,
|
|
EAPOL_DESCRIPTOR_TYPE_WPA = 254,
|
|
};
|
|
|
|
enum eapol_key_descriptor_version {
|
|
EAPOL_KEY_DESCRIPTOR_VERSION_AKM_DEFINED = 0,
|
|
EAPOL_KEY_DESCRIPTOR_VERSION_HMAC_MD5_ARC4 = 1,
|
|
EAPOL_KEY_DESCRIPTOR_VERSION_HMAC_SHA1_AES = 2,
|
|
EAPOL_KEY_DESCRIPTOR_VERSION_AES_128_CMAC_AES = 3,
|
|
};
|
|
|
|
struct eapol_header {
|
|
uint8_t protocol_version;
|
|
uint8_t packet_type;
|
|
__be16 packet_len;
|
|
} __attribute__ ((packed));
|
|
|
|
struct eapol_frame {
|
|
struct eapol_header header;
|
|
uint8_t data[0];
|
|
} __attribute__ ((packed));
|
|
|
|
/* gets pointer to MIC */
|
|
#define EAPOL_KEY_MIC(ek) ((ek)->key_data)
|
|
|
|
/* get key data length */
|
|
#define EAPOL_KEY_DATA_LEN(ek, mic_len) l_get_be16((ek)->key_data + (mic_len))
|
|
|
|
/* gets pointer to key data */
|
|
#define EAPOL_KEY_DATA(ek, mic_len) ((ek)->key_data + (mic_len) + 2)
|
|
|
|
/* gets frame length (not including key data) */
|
|
#define EAPOL_FRAME_LEN(mic_len) sizeof(struct eapol_key) + (mic_len) + 2
|
|
|
|
struct eapol_key {
|
|
struct eapol_header header;
|
|
uint8_t descriptor_type;
|
|
#if defined(__LITTLE_ENDIAN_BITFIELD)
|
|
bool key_mic:1;
|
|
bool secure:1;
|
|
bool error:1;
|
|
bool request:1;
|
|
bool encrypted_key_data:1;
|
|
bool smk_message:1;
|
|
uint8_t reserved2:2;
|
|
uint8_t key_descriptor_version:3;
|
|
bool key_type:1;
|
|
uint8_t wpa_key_id:2; /* Bits 4-5 reserved in RSN, Key ID in WPA */
|
|
bool install:1;
|
|
bool key_ack:1;
|
|
#elif defined (__BIG_ENDIAN_BITFIELD)
|
|
uint8_t reserved2:2;
|
|
bool smk_message:1;
|
|
bool encrypted_key_data:1;
|
|
bool request:1;
|
|
bool error:1;
|
|
bool secure:1;
|
|
bool key_mic:1;
|
|
bool key_ack:1;
|
|
bool install:1;
|
|
uint8_t wpa_key_id:2; /* Bits 4-5 reserved in RSN, Key ID in WPA */
|
|
bool key_type:1;
|
|
uint8_t key_descriptor_version:3;
|
|
#else
|
|
#error "Please fix <asm/byteorder.h>"
|
|
#endif
|
|
|
|
__be16 key_length;
|
|
__be64 key_replay_counter;
|
|
uint8_t key_nonce[32];
|
|
uint8_t eapol_key_iv[16];
|
|
uint8_t key_rsc[8];
|
|
uint8_t reserved[8];
|
|
uint8_t key_data[0];
|
|
} __attribute__ ((packed));
|
|
|
|
const struct eapol_key *eapol_key_validate(const uint8_t *frame, size_t len,
|
|
size_t mic_len);
|