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eapol: Add eapol_append_key_data utility

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Add a utility to append a KDE to the key_data field in an EAPoL frame.
The KDE types enum is actually added to handshake.h because we've got
the utilities for finding those KDEs in a buffer there.  The new
function is specific to EAPoL-Key frames though and perhaps to simple to
be split across handshake.c and eapol.c.  Also it didn't seem useful to
use the ie_tlv_builder here.
This commit is contained in:
Andrew Zaborowski 2017-09-22 05:06:40 +02:00 committed by Denis Kenzior
parent 29ee350ec3
commit 89c2f14683
3 changed files with 34 additions and 0 deletions
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16
src/eapol.c
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@ -352,6 +352,22 @@ bool eapol_encrypt_key_data(const uint8_t *kek, uint8_t *key_data,
return true;
}
void eapol_key_data_append(struct eapol_key *ek, enum handshake_kde selector,
const uint8_t *data, size_t data_len)
{
uint16_t key_data_len = L_BE16_TO_CPU(ek->key_data_len);
ek->key_data[key_data_len++] = IE_TYPE_VENDOR_SPECIFIC;
ek->key_data[key_data_len++] = 4 + data_len; /* OUI + Data type + len */
l_put_be32(selector, ek->key_data + key_data_len);
key_data_len += 4;
memcpy(ek->key_data + key_data_len, data, data_len);
key_data_len += data_len;
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;

3
src/eapol.h
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@ -50,6 +50,7 @@ enum eapol_key_descriptor_version {
struct eapol_sm;
struct handshake_state;
struct preauth_sm;
enum handshake_kde;
struct eapol_header {
uint8_t protocol_version;
@ -138,6 +139,8 @@ uint8_t *eapol_decrypt_key_data(const uint8_t *kek,
bool eapol_encrypt_key_data(const uint8_t *kek, uint8_t *key_data,
size_t key_data_len,
struct eapol_key *out_frame);
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);

15
src/handshake.h
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@ -25,6 +25,21 @@
#include <asm/byteorder.h>
#include <linux/types.h>
/* 802.11-2016 Table 12-6 in section 12.7.2 */
enum handshake_kde {
HANDSHAKE_KDE_GTK = 0x000fac01,
HANDSHAKE_KDE_MAC_ADDRESS = 0x000fac03,
HANDSHAKE_KDE_PMKID = 0x000fac04,
HANDSHAKE_KDE_SMK = 0x000fac05,
HANDSHAKE_KDE_NONCE = 0x000fac06,
HANDSHAKE_KDE_LIFETIME = 0x000fac07,
HANDSHAKE_KDE_ERROR = 0x000fac08,
HANDSHAKE_KDE_IGTK = 0x000fac09,
HANDSHAKE_KDE_KEY_ID = 0x000fac0a,
HANDSHAKE_KDE_MULTIBAND_GTK = 0x000fac0b,
HANDSHAKE_KDE_MULTIBAND_KEY_ID = 0x000fac0c,
};
typedef bool (*handshake_get_nonce_func_t)(uint8_t nonce[]);
typedef void (*handshake_install_tk_func_t)(uint32_t ifindex, const uint8_t *aa,
const uint8_t *tk, uint32_t cipher,