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eapol: Move eapol_key_validate() into eapolutil helper

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This commit is contained in:
Marcel Holtmann 2018-09-14 17:30:03 +02:00
parent c40be7a7d5
commit 1e37ef31fe
6 changed files with 190 additions and 172 deletions
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10
Makefile.am
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@ -112,6 +112,7 @@ src_iwd_SOURCES = src/main.c linux/nl80211.h src/iwd.h \
src/dbus.h src/dbus.c \
src/mpdu.h src/mpdu.c \
src/eapol.h src/eapol.c \
src/eapolutil.h src/eapolutil.c \
src/handshake.h src/handshake.c \
src/scan.h src/scan.c \
src/common.h src/common.c \
@ -187,10 +188,8 @@ monitor_iwmon_SOURCES = monitor/main.c linux/nl80211.h \
src/util.h src/util.c \
src/crypto.h src/crypto.c \
src/watchlist.h src/watchlist.c \
src/eapol.h src/eapol.c \
src/handshake.h src/handshake.c \
src/eap.h src/eap.c src/eap-private.h \
src/eap-dummy.c
src/eapolutil.h src/eapolutil.c \
src/handshake.h src/handshake.c
monitor_iwmon_LDADD = ell/libell-internal.la
endif
@ -258,6 +257,7 @@ unit_test_eap_sim_SOURCES = unit/test-eap-sim.c \
src/ie.h src/ie.c \
src/watchlist.h src/watchlist.c \
src/eapol.h src/eapol.c \
src/eapolutil.h src/eapolutil.c \
src/handshake.h src/handshake.c \
src/eap.h src/eap.c src/eap-private.h \
src/util.h src/util.c \
@ -312,6 +312,7 @@ unit_test_eapol_SOURCES = unit/test-eapol.c \
src/ie.h src/ie.c \
src/watchlist.h src/watchlist.c \
src/eapol.h src/eapol.c \
src/eapolutil.h src/eapolutil.c \
src/handshake.h src/handshake.c \
src/eap.h src/eap.c src/eap-private.h \
src/eap-tls.c src/eap-ttls.c \
@ -331,6 +332,7 @@ unit_test_wsc_SOURCES = unit/test-wsc.c src/wscutil.h src/wscutil.c \
src/ie.h src/ie.c \
src/watchlist.h src/watchlist.c \
src/eapol.h src/eapol.c \
src/eapolutil.h src/eapolutil.c \
src/handshake.h src/handshake.c \
src/eap.h src/eap.c src/eap-private.h \
src/util.h src/util.c \

41
src/eap-dummy.c
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@ -1,41 +0,0 @@
/*
*
* Wireless daemon for Linux
*
* Copyright (C) 2016 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
*
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <ell/ell.h>
#include "eap.h"
#include "eap-private.h"
static int eap_dummy_init(void)
{
return 0;
}
static void eap_dummy_exit(void)
{
}
EAP_METHOD_BUILTIN(eap_dummy, eap_dummy_init, eap_dummy_exit)

47
src/eapol.c
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@ -273,53 +273,6 @@ void eapol_key_data_append(struct eapol_key *ek, enum handshake_kde selector,
ek->key_data_len = L_CPU_TO_BE16(key_data_len);
}
const struct eapol_key *eapol_key_validate(const uint8_t *frame, size_t len)
{
const struct eapol_key *ek;
uint16_t key_data_len;
if (len < sizeof(struct eapol_key))
return NULL;
ek = (const struct eapol_key *) frame;
switch (ek->header.protocol_version) {
case EAPOL_PROTOCOL_VERSION_2001:
case EAPOL_PROTOCOL_VERSION_2004:
break;
default:
return NULL;
}
if (ek->header.packet_type != 3)
return NULL;
switch (ek->descriptor_type) {
case EAPOL_DESCRIPTOR_TYPE_RC4:
case EAPOL_DESCRIPTOR_TYPE_80211:
case EAPOL_DESCRIPTOR_TYPE_WPA:
break;
default:
return NULL;
}
switch (ek->key_descriptor_version) {
case EAPOL_KEY_DESCRIPTOR_VERSION_HMAC_MD5_ARC4:
case EAPOL_KEY_DESCRIPTOR_VERSION_HMAC_SHA1_AES:
case EAPOL_KEY_DESCRIPTOR_VERSION_AES_128_CMAC_AES:
case EAPOL_KEY_DESCRIPTOR_VERSION_AKM_DEFINED:
break;
default:
return NULL;
}
key_data_len = L_BE16_TO_CPU(ek->key_data_len);
if (len < sizeof(struct eapol_key) + key_data_len)
return NULL;
return ek;
}
#define VERIFY_PTK_COMMON(ek) \
if (!ek->key_type) \
return false; \

81
src/eapol.h
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@ -24,29 +24,7 @@
#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,
};
#include "src/eapolutil.h"
struct eapol_sm;
struct handshake_state;
@ -54,61 +32,6 @@ struct preauth_sm;
enum handshake_kde;
enum ie_rsn_akm_suite;
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));
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_mic_data[16];
__be16 key_data_len;
uint8_t key_data[0];
} __attribute__ ((packed));
typedef int (*eapol_tx_packet_func_t)(uint32_t ifindex,
const uint8_t *dest, uint16_t proto,
const struct eapol_frame *ef,
@ -142,8 +65,6 @@ bool eapol_encrypt_key_data(const uint8_t *kek, uint8_t *key_data,
void eapol_key_data_append(struct eapol_key *ek, enum handshake_kde selector,
const uint8_t *data, size_t data_len);
const struct eapol_key *eapol_key_validate(const uint8_t *frame, size_t len);
bool eapol_verify_ptk_1_of_4(const struct eapol_key *ek);
bool eapol_verify_ptk_2_of_4(const struct eapol_key *ek);
bool eapol_verify_ptk_3_of_4(const struct eapol_key *ek, bool is_wpa);

77
src/eapolutil.c Normal file
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@ -0,0 +1,77 @@
/*
*
* 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
*
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <stdio.h>
#include <ell/ell.h>
#include "eapolutil.h"
const struct eapol_key *eapol_key_validate(const uint8_t *frame, size_t len)
{
const struct eapol_key *ek;
uint16_t key_data_len;
if (len < sizeof(struct eapol_key))
return NULL;
ek = (const struct eapol_key *) frame;
switch (ek->header.protocol_version) {
case EAPOL_PROTOCOL_VERSION_2001:
case EAPOL_PROTOCOL_VERSION_2004:
break;
default:
return NULL;
}
if (ek->header.packet_type != 3)
return NULL;
switch (ek->descriptor_type) {
case EAPOL_DESCRIPTOR_TYPE_RC4:
case EAPOL_DESCRIPTOR_TYPE_80211:
case EAPOL_DESCRIPTOR_TYPE_WPA:
break;
default:
return NULL;
}
switch (ek->key_descriptor_version) {
case EAPOL_KEY_DESCRIPTOR_VERSION_HMAC_MD5_ARC4:
case EAPOL_KEY_DESCRIPTOR_VERSION_HMAC_SHA1_AES:
case EAPOL_KEY_DESCRIPTOR_VERSION_AES_128_CMAC_AES:
case EAPOL_KEY_DESCRIPTOR_VERSION_AKM_DEFINED:
break;
default:
return NULL;
}
key_data_len = L_BE16_TO_CPU(ek->key_data_len);
if (len < sizeof(struct eapol_key) + key_data_len)
return NULL;
return ek;
}

106
src/eapolutil.h Normal file
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@ -0,0 +1,106 @@
/*
*
* 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));
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_mic_data[16];
__be16 key_data_len;
uint8_t key_data[0];
} __attribute__ ((packed));
const struct eapol_key *eapol_key_validate(const uint8_t *frame, size_t len);