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iwd
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dpp: support mutual authentication 

This will be needed for PKEX support. It requires an additional
value, L, be derived and used in some of the hashing functions.
This commit is contained in:
James Prestwood 2023-10-26 13:26:49 -07:00 committed by Denis Kenzior
parent 2f2798afb8
commit acb1abceae
1 changed files with 34 additions and 7 deletions
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41
src/dpp.c
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@ -150,6 +150,7 @@ struct dpp_sm {
bool mcast_support : 1;
bool roc_started : 1;
bool channel_switch : 1;
bool mutual_auth : 1;
};
static bool dpp_get_started(struct l_dbus *dbus,
@ -1172,7 +1173,7 @@ static void dpp_handle_config_result_frame(struct dpp_sm *dpp,
static void send_authenticate_response(struct dpp_sm *dpp)
{
uint8_t hdr[32];
uint8_t attrs[256];
uint8_t attrs[512];
uint8_t *ptr = attrs;
uint8_t status = DPP_STATUS_OK;
uint64_t r_proto_key[L_ECC_MAX_DIGITS * 2];
@ -1193,6 +1194,9 @@ static void send_authenticate_response(struct dpp_sm *dpp)
ptr += dpp_append_attr(ptr, DPP_ATTR_STATUS, &status, 1);
ptr += dpp_append_attr(ptr, DPP_ATTR_RESPONDER_BOOT_KEY_HASH,
dpp->own_boot_hash, 32);
if (dpp->mutual_auth)
ptr += dpp_append_attr(ptr, DPP_ATTR_INITIATOR_BOOT_KEY_HASH,
dpp->peer_boot_hash, 32);
ptr += dpp_append_attr(ptr, DPP_ATTR_RESPONDER_PROTOCOL_KEY,
r_proto_key, dpp->key_len * 2);
ptr += dpp_append_attr(ptr, DPP_ATTR_PROTOCOL_VERSION, &version, 1);
@ -1246,6 +1250,7 @@ static void authenticate_confirm(struct dpp_sm *dpp, const uint8_t *from,
const void *unwrap_key;
const void *ad0 = body + 2;
const void *ad1 = body + 8;
struct l_ecc_point *bi = NULL;
if (dpp->state != DPP_STATE_AUTHENTICATING)
return;
@ -1338,9 +1343,12 @@ static void authenticate_confirm(struct dpp_sm *dpp, const uint8_t *from,
goto auth_confirm_failed;
}
if (dpp->mutual_auth)
bi = dpp->peer_boot_public;
dpp_derive_i_auth(dpp->r_nonce, dpp->i_nonce, dpp->nonce_len,
dpp->own_proto_public, dpp->peer_proto_public,
dpp->boot_public, NULL, i_auth_check);
dpp->boot_public, bi, i_auth_check);
if (memcmp(i_auth, i_auth_check, i_auth_len)) {
l_error("I-Auth did not verify");
@ -1656,6 +1664,8 @@ static void authenticate_request(struct dpp_sm *dpp, const uint8_t *from,
_auto_(l_free) uint8_t *unwrapped = NULL;
_auto_(l_ecc_scalar_free) struct l_ecc_scalar *m = NULL;
_auto_(l_ecc_scalar_free) struct l_ecc_scalar *n = NULL;
_auto_(l_ecc_point_free) struct l_ecc_point *l = NULL;
struct l_ecc_point *bi = NULL;
uint64_t k1[L_ECC_MAX_DIGITS];
const void *ad0 = body + 2;
const void *ad1 = body + 8;
@ -1803,6 +1813,12 @@ static void authenticate_request(struct dpp_sm *dpp, const uint8_t *from,
memcpy(dpp->i_nonce, i_nonce, i_nonce_len);
if (dpp->mutual_auth) {
l = dpp_derive_lr(dpp->boot_private, dpp->proto_private,
dpp->peer_boot_public);
bi = dpp->peer_boot_public;
}
/* Derive keys k2, ke, and R-Auth for authentication response */
n = dpp_derive_k2(dpp->peer_proto_public, dpp->proto_private, dpp->k2);
@ -1811,12 +1827,12 @@ static void authenticate_request(struct dpp_sm *dpp, const uint8_t *from,
l_getrandom(dpp->r_nonce, dpp->nonce_len);
if (!dpp_derive_ke(dpp->i_nonce, dpp->r_nonce, m, n, NULL, dpp->ke))
if (!dpp_derive_ke(dpp->i_nonce, dpp->r_nonce, m, n, l, dpp->ke))
goto auth_request_failed;
if (!dpp_derive_r_auth(dpp->i_nonce, dpp->r_nonce, dpp->nonce_len,
dpp->peer_proto_public, dpp->own_proto_public,
NULL, dpp->boot_public, dpp->auth_tag))
bi, dpp->boot_public, dpp->auth_tag))
goto auth_request_failed;
memcpy(dpp->peer_addr, from, 6);
@ -1851,6 +1867,9 @@ static void dpp_send_authenticate_confirm(struct dpp_sm *dpp)
ptr += dpp_append_attr(ptr, DPP_ATTR_STATUS, &zero, 1);
ptr += dpp_append_attr(ptr, DPP_ATTR_RESPONDER_BOOT_KEY_HASH,
dpp->peer_boot_hash, 32);
if (dpp->mutual_auth)
ptr += dpp_append_attr(ptr, DPP_ATTR_INITIATOR_BOOT_KEY_HASH,
dpp->own_boot_hash, 32);
ptr += dpp_append_wrapped_data(hdr + 26, 6, attrs, ptr - attrs, ptr,
sizeof(attrs), dpp->ke, dpp->key_len, 1,
@ -1883,6 +1902,8 @@ static void authenticate_response(struct dpp_sm *dpp, const uint8_t *from,
const void *r_auth = NULL;
_auto_(l_ecc_point_free) struct l_ecc_point *r_proto_key = NULL;
_auto_(l_ecc_scalar_free) struct l_ecc_scalar *n = NULL;
_auto_(l_ecc_point_free) struct l_ecc_point *l = NULL;
struct l_ecc_point *bi = NULL;
const void *ad0 = body + 2;
const void *ad1 = body + 8;
uint64_t r_auth_derived[L_ECC_MAX_DIGITS];
@ -1987,7 +2008,13 @@ static void authenticate_response(struct dpp_sm *dpp, const uint8_t *from,
return;
}
if (!dpp_derive_ke(i_nonce, r_nonce, dpp->m, n, NULL, dpp->ke)) {
if (dpp->mutual_auth) {
l = dpp_derive_li(dpp->peer_boot_public, r_proto_key,
dpp->boot_private);
bi = dpp->boot_public;
}
if (!dpp_derive_ke(i_nonce, r_nonce, dpp->m, n, l, dpp->ke)) {
l_debug("Failed to derive ke");
return;
}
@ -2020,7 +2047,7 @@ static void authenticate_response(struct dpp_sm *dpp, const uint8_t *from,
}
if (!dpp_derive_r_auth(i_nonce, r_nonce, dpp->nonce_len,
dpp->own_proto_public, r_proto_key, NULL,
dpp->own_proto_public, r_proto_key, bi,
dpp->peer_boot_public, r_auth_derived)) {
l_debug("Failed to derive r_auth");
return;
@ -2033,7 +2060,7 @@ static void authenticate_response(struct dpp_sm *dpp, const uint8_t *from,
if (!dpp_derive_i_auth(r_nonce, i_nonce, dpp->nonce_len,
r_proto_key, dpp->own_proto_public,
dpp->peer_boot_public, NULL, dpp->auth_tag)) {
dpp->peer_boot_public, bi, dpp->auth_tag)) {
l_debug("Could not derive I-Auth");
return;
}