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eapol: change eapol_create_common to support FILS

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FILS needs to allocate an extra 16 bytes of key data for the AES-SIV
vector. Instead of leaving it up to the caller to figure this out (as
was done with the GTK builder) eapol_create_common can allocate the
extra space since it knows the MIC length.

This also updates _create_gtk_2_of_2 as it no longer needs to create
an extra data array.
This commit is contained in:
James Prestwood 2019-04-26 11:31:54 -07:00 committed by Denis Kenzior
parent 4209837c0d
commit 83212f9b23
1 changed files with 7 additions and 7 deletions
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14
src/eapol.c
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@ -684,15 +684,18 @@ static struct eapol_key *eapol_create_common(
bool is_wpa,
size_t mic_len)
{
size_t extra_key_len = (mic_len == 0) ? 16 : 0;
size_t to_alloc = EAPOL_FRAME_LEN(mic_len);
struct eapol_key *out_frame = l_malloc(to_alloc + extra_len);
struct eapol_key *out_frame = l_malloc(to_alloc + extra_len +
extra_key_len);
memset(out_frame, 0, to_alloc + extra_len);
out_frame->header.protocol_version = protocol;
out_frame->header.packet_type = 0x3;
out_frame->header.packet_len = L_CPU_TO_BE16(to_alloc + extra_len - 4);
out_frame->header.packet_len = L_CPU_TO_BE16(to_alloc + extra_len +
extra_key_len - 4);
out_frame->descriptor_type = is_wpa ? EAPOL_DESCRIPTOR_TYPE_WPA :
EAPOL_DESCRIPTOR_TYPE_80211;
out_frame->key_descriptor_version = version;
@ -709,7 +712,7 @@ static struct eapol_key *eapol_create_common(
out_frame->key_replay_counter = L_CPU_TO_BE64(key_replay_counter);
memcpy(out_frame->key_nonce, snonce, sizeof(out_frame->key_nonce));
l_put_be16(extra_len, out_frame->key_data + mic_len);
l_put_be16(extra_len + extra_key_len, out_frame->key_data + mic_len);
if (extra_len)
memcpy(EAPOL_KEY_DATA(out_frame, mic_len), extra_data,
@ -756,15 +759,12 @@ struct eapol_key *eapol_create_gtk_2_of_2(
bool is_wpa, uint8_t wpa_key_id, size_t mic_len)
{
uint8_t snonce[32];
uint8_t extra[16] = { 0 };
struct eapol_key *step2;
memset(snonce, 0, sizeof(snonce));
step2 = eapol_create_common(protocol, version, true,
key_replay_counter, snonce,
(mic_len) ? 0 : 16,
(mic_len) ? NULL : extra,
0, is_wpa, mic_len);
0, NULL, 0, is_wpa, mic_len);
if (!step2)
return step2;