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handshake: Add handshake_state_get_pmkid

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Returns the PMKID for the current PMK (configured through
handshake_state_set_pmk for PSK, created through EAP or from
pre-authentication)
This commit is contained in:
Andrew Zaborowski 2017-04-15 13:58:45 +02:00 committed by Denis Kenzior
parent 0f6685bf45
commit b175e7ae06
2 changed files with 27 additions and 0 deletions
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25
src/handshake.c
View File

@ -360,6 +360,31 @@ void handshake_state_override_pairwise_cipher(struct handshake_state *s,
s->pairwise_cipher = pairwise; s->pairwise_cipher = pairwise;
} }
bool handshake_state_get_pmkid(struct handshake_state *s, uint8_t *out_pmkid)
{
bool use_sha256;
if (!s->have_pmk)
return false;
/*
* Note 802.11 section 11.6.1.3:
* "When the PMKID is calculated for the PMKSA as part of RSN
* preauthentication, the AKM has not yet been negotiated. In this
* case, the HMAC-SHA1-128 based derivation is used for the PMKID
* calculation."
*/
if (s->akm_suite & (IE_RSN_AKM_SUITE_8021X_SHA256 |
IE_RSN_AKM_SUITE_PSK_SHA256))
use_sha256 = true;
else
use_sha256 = false;
return crypto_derive_pmkid(s->pmk, s->spa, s->aa, out_pmkid,
use_sha256);
}
/* /*
* This function performs a match of the RSN/WPA IE obtained from the scan * This function performs a match of the RSN/WPA IE obtained from the scan
* results vs the RSN/WPA IE obtained as part of the 4-way handshake. If they * results vs the RSN/WPA IE obtained as part of the 4-way handshake. If they

2
src/handshake.h
View File

@ -130,6 +130,8 @@ void handshake_state_install_igtk(struct handshake_state *s,
void handshake_state_override_pairwise_cipher(struct handshake_state *s, void handshake_state_override_pairwise_cipher(struct handshake_state *s,
enum ie_rsn_cipher_suite pairwise); enum ie_rsn_cipher_suite pairwise);
bool handshake_state_get_pmkid(struct handshake_state *s, uint8_t *out_pmkid);
bool handshake_decode_fte_key(struct handshake_state *s, const uint8_t *wrapped, bool handshake_decode_fte_key(struct handshake_state *s, const uint8_t *wrapped,
size_t key_len, uint8_t *key_out); size_t key_len, uint8_t *key_out);