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eapol: choose key descriptor version in AP mode

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The key descriptor version was hard coded to HMAC_SHA1_AES which
is correct when using IE_RSN_AKM_SUITE_PSK + CCMP. ap.c hard
codes the PSK AKM but still uses wiphy to select the cipher. In
theory there could be hardware that only supports TKIP which
would then make IWD non-compliant since a different key descriptor
version should be used with PSK + TKIP (HMAC_MD5_ARC4).

Now use a helper to sort out which key descriptor should be used
given the AKM and cipher suite.
This commit is contained in:
James Prestwood 2022-10-26 11:56:52 -07:00 committed by Denis Kenzior
parent 639e2a6fa3
commit 4da101da92
1 changed files with 12 additions and 4 deletions
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16
src/eapol.c
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@ -1062,6 +1062,7 @@ static void eapol_send_ptk_1_of_4(struct eapol_sm *sm)
enum crypto_cipher cipher = ie_rsn_cipher_suite_to_cipher(
sm->handshake->pairwise_cipher);
uint8_t pmkid[16];
uint8_t key_descriptor_version;
handshake_state_new_anonce(sm->handshake);
@ -1073,8 +1074,11 @@ static void eapol_send_ptk_1_of_4(struct eapol_sm *sm)
ek->header.protocol_version = sm->protocol_version;
ek->header.packet_type = 0x3;
ek->descriptor_type = EAPOL_DESCRIPTOR_TYPE_80211;
/* Must be HMAC-SHA1-128 + AES when using CCMP with PSK or 8021X */
ek->key_descriptor_version = EAPOL_KEY_DESCRIPTOR_VERSION_HMAC_SHA1_AES;
L_WARN_ON(eapol_key_descriptor_version_from_akm(
sm->handshake->akm_suite,
sm->handshake->pairwise_cipher,
&key_descriptor_version) < 0);
ek->key_descriptor_version = key_descriptor_version;
ek->key_type = true;
ek->key_ack = true;
ek->key_length = L_CPU_TO_BE16(crypto_cipher_key_len(cipher));
@ -1358,6 +1362,7 @@ static void eapol_send_ptk_3_of_4(struct eapol_sm *sm)
sm->handshake->group_cipher);
const uint8_t *kck;
const uint8_t *kek;
uint8_t key_descriptor_version;
sm->replay_counter++;
@ -1365,8 +1370,11 @@ static void eapol_send_ptk_3_of_4(struct eapol_sm *sm)
ek->header.protocol_version = sm->protocol_version;
ek->header.packet_type = 0x3;
ek->descriptor_type = EAPOL_DESCRIPTOR_TYPE_80211;
/* Must be HMAC-SHA1-128 + AES when using CCMP with PSK or 8021X */
ek->key_descriptor_version = EAPOL_KEY_DESCRIPTOR_VERSION_HMAC_SHA1_AES;
L_WARN_ON(eapol_key_descriptor_version_from_akm(
sm->handshake->akm_suite,
sm->handshake->pairwise_cipher,
&key_descriptor_version) < 0);
ek->key_descriptor_version = key_descriptor_version;
ek->key_type = true;
ek->install = true;
ek->key_ack = true;