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handshake: add callback for extended key IDs

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The procedure for setting extended key IDs is different from the
single PTK key. The key ID is toggled between 0 and 1 and the new
key is set as RX only, then set to RX/TX after message 4/4 goes
out.

Since netdev needs to set this new key before sending message 4,
eapol can include a built message which netdev will store if
required (i.e. using PAE).
This commit is contained in:
James Prestwood 2021-10-07 13:49:47 -07:00 committed by Denis Kenzior
parent fba3b90c11
commit 63b0778c99
2 changed files with 35 additions and 0 deletions
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23
src/handshake.c
View File

@ -76,6 +76,7 @@ static handshake_get_nonce_func_t get_nonce = handshake_get_nonce;
static handshake_install_tk_func_t install_tk = NULL;
static handshake_install_gtk_func_t install_gtk = NULL;
static handshake_install_igtk_func_t install_igtk = NULL;
static handshake_install_ext_tk_func_t install_ext_tk = NULL;
void __handshake_set_get_nonce_func(handshake_get_nonce_func_t func)
{
@ -97,6 +98,11 @@ void __handshake_set_install_igtk_func(handshake_install_igtk_func_t func)
install_igtk = func;
}
void __handshake_set_install_ext_tk_func(handshake_install_ext_tk_func_t func)
{
install_ext_tk = func;
}
void handshake_state_free(struct handshake_state *s)
{
__typeof__(s->free) destroy = s->free;
@ -664,6 +670,23 @@ void handshake_state_install_ptk(struct handshake_state *s)
}
}
void handshake_state_install_ext_ptk(struct handshake_state *s,
uint8_t key_idx,
struct eapol_frame *ek, uint16_t proto,
bool noencrypt)
{
s->ptk_complete = true;
if (install_ext_tk) {
uint32_t cipher =
ie_rsn_cipher_suite_to_cipher(s->pairwise_cipher);
install_ext_tk(s, key_idx, handshake_get_tk(s), cipher, ek,
proto, noencrypt);
}
}
void handshake_state_install_gtk(struct handshake_state *s,
uint16_t gtk_key_index,
const uint8_t *gtk, size_t gtk_len,

12
src/handshake.h
View File

@ -27,6 +27,7 @@
struct handshake_state;
enum crypto_cipher;
struct eapol_frame;
enum handshake_kde {
/* 802.11-2020 Table 12-9 in section 12.7.2 */
@ -78,11 +79,17 @@ typedef void (*handshake_install_igtk_func_t)(struct handshake_state *hs,
const uint8_t *igtk, uint8_t igtk_len,
const uint8_t *ipn, uint8_t ipn_len,
uint32_t cipher);
typedef void (*handshake_install_ext_tk_func_t)(struct handshake_state *hs,
uint8_t key_idx, const uint8_t *tk,
uint32_t cipher,
const struct eapol_frame *step4,
uint16_t proto, bool noencrypt);
void __handshake_set_get_nonce_func(handshake_get_nonce_func_t func);
void __handshake_set_install_tk_func(handshake_install_tk_func_t func);
void __handshake_set_install_gtk_func(handshake_install_gtk_func_t func);
void __handshake_set_install_igtk_func(handshake_install_igtk_func_t func);
void __handshake_set_install_ext_tk_func(handshake_install_ext_tk_func_t func);
struct handshake_state {
uint32_t ifindex;
@ -226,6 +233,11 @@ size_t handshake_state_get_kek_len(struct handshake_state *s);
const uint8_t *handshake_state_get_kek(struct handshake_state *s);
void handshake_state_install_ptk(struct handshake_state *s);
void handshake_state_install_ext_ptk(struct handshake_state *s,
uint8_t key_idx,
struct eapol_frame *ek, uint16_t proto,
bool noencrypt);
void handshake_state_install_gtk(struct handshake_state *s,
uint16_t gtk_key_index,
const uint8_t *gtk, size_t gtk_len,