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network: add support for SAE password identifiers

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Adds a new network profile setting [Security].PasswordIdentifier.
When set (and the BSS enables SAE password identifiers) the network
and handshake object will read this and use it for the SAE
exchange.

Building the handshake will fail if:
 - there is no password identifier set and the BSS sets the
   "exclusive" bit.
 - there is a password identifier set and the BSS does not set
   the "in-use" bit.
This commit is contained in:
James Prestwood 2023-12-14 04:33:57 -08:00 committed by Denis Kenzior
parent e8e5d91e5a
commit 3349cdd5f4
1 changed files with 36 additions and 1 deletions
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37
src/network.c
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@ -70,6 +70,7 @@ struct network {
struct network_info *info;
unsigned char *psk;
char *passphrase;
char *password_identifier;
struct l_ecc_point *sae_pt_19; /* SAE PT for Group 19 */
struct l_ecc_point *sae_pt_20; /* SAE PT for Group 20 */
unsigned int agent_request;
@ -124,6 +125,13 @@ static void network_reset_passphrase(struct network *network)
network->passphrase = NULL;
}
if (network->password_identifier) {
explicit_bzero(network->password_identifier,
strlen(network->password_identifier));
l_free(network->password_identifier);
network->password_identifier = NULL;
}
if (network->sae_pt_19) {
l_ecc_point_free(network->sae_pt_19);
network->sae_pt_19 = NULL;
@ -317,7 +325,8 @@ static struct l_ecc_point *network_generate_sae_pt(struct network *network,
l_debug("Generating PT for Group %u", group);
pt = crypto_derive_sae_pt_ecc(group, network->ssid,
network->passphrase, NULL);
network->passphrase,
network->password_identifier);
if (!pt)
l_warn("SAE PT generation for Group %u failed", group);
@ -462,6 +471,10 @@ static int network_set_handshake_secrets_psk(struct network *network,
handshake_state_set_passphrase(hs, network->passphrase);
if (network->password_identifier)
handshake_state_set_password_identifier(hs,
network->password_identifier);
if (ie_rsnxe_capable(hs->authenticator_rsnxe,
IE_RSNX_SAE_H2E)) {
l_debug("Authenticator is SAE H2E capable");
@ -495,6 +508,19 @@ int network_handshake_setup(struct network *network, struct scan_bss *bss,
switch (network->security) {
case SECURITY_PSK:
/* Check the BSS password ID settings match our configuration */
if (bss->sae_pw_id_exclusive && !network->password_identifier) {
l_error("[Security].PasswordIdentifier is not set but "
"BSS requires SAE password identifiers");
return -ENOKEY;
}
if (!bss->sae_pw_id_used && network->password_identifier) {
l_error("[Security].PasswordIdentifier set but BSS "
"does not not use password identifiers");
return -ENOKEY;
}
r = network_set_handshake_secrets_psk(network, hs);
if (r < 0)
return r;
@ -631,6 +657,9 @@ static int network_load_psk(struct network *network, struct scan_bss *bss)
_auto_(l_free) char *passphrase =
l_settings_get_string(network->settings,
"Security", "Passphrase");
_auto_(l_free) char *password_id =
l_settings_get_string(network->settings, "Security",
"PasswordIdentifier");
_auto_(l_free) char *path =
storage_get_network_file_path(security, ssid);
@ -655,6 +684,7 @@ static int network_load_psk(struct network *network, struct scan_bss *bss)
network_reset_passphrase(network);
network_reset_psk(network);
network->passphrase = l_steal_ptr(passphrase);
network->password_identifier = l_steal_ptr(password_id);
if (network_settings_load_pt_ecc(network, path,
19, &network->sae_pt_19) > 0)
@ -726,6 +756,11 @@ static void network_settings_save(struct network *network,
l_settings_set_string(settings, "Security", "Passphrase",
network->passphrase);
if (network->password_identifier)
l_settings_set_string(settings, "Security",
"PasswordIdentifier",
network->password_identifier);
if (network->sae_pt_19)
network_settings_save_sae_pt_ecc(settings, network->sae_pt_19);