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network: Also support SAE PT for group 20

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Generalize loading / saving of SAE PTs and add support for saving /
loading of ECC group 20 based SAE PT.
This commit is contained in:
Denis Kenzior 2021-07-12 16:35:04 -05:00
parent a46269d5b0
commit 9c07741a0a
1 changed files with 74 additions and 30 deletions
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104
src/network.c
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@ -56,6 +56,8 @@
#include "src/erp.h"
#include "src/handshake.h"
#define SAE_PT_SETTING "SAE-PT-Group%u"
static uint32_t known_networks_watch;
static uint32_t anqp_watch;
@ -68,6 +70,7 @@ struct network {
unsigned char *psk;
char *passphrase;
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;
struct l_queue *bss_list;
struct l_settings *settings;
@ -118,6 +121,11 @@ static void network_reset_passphrase(struct network *network)
l_ecc_point_free(network->sae_pt_19);
network->sae_pt_19 = NULL;
}
if (network->sae_pt_20) {
l_ecc_point_free(network->sae_pt_20);
network->sae_pt_20 = NULL;
}
}
static void network_settings_close(struct network *network)
@ -288,18 +296,19 @@ static const uint8_t *network_get_psk(struct network *network)
return network->psk;
}
static void network_generate_sae_pt_19(struct network *network)
static struct l_ecc_point *network_generate_sae_pt(struct network *network,
unsigned int group)
{
l_debug("Generating PT for Group 19");
struct l_ecc_point *pt;
network->sae_pt_19 = crypto_derive_sae_pt_ecc(19, network->ssid,
l_debug("Generating PT for Group %u", group);
pt = crypto_derive_sae_pt_ecc(group, network->ssid,
network->passphrase, NULL);
if (!network->sae_pt_19) {
l_warn("SAE PT generation for Group 19 failed");
return;
}
if (!pt)
l_warn("SAE PT generation for Group %u failed", group);
network->sync_settings = true;
return pt;
}
static bool __network_set_passphrase(struct network *network,
@ -311,7 +320,9 @@ static bool __network_set_passphrase(struct network *network,
network_reset_passphrase(network);
network->passphrase = l_strdup(passphrase);
network_generate_sae_pt_19(network);
network->sae_pt_19 = network_generate_sae_pt(network, 19);
network->sae_pt_20 = network_generate_sae_pt(network, 20);
network->sync_settings = true;
return true;
@ -512,6 +523,45 @@ int network_handshake_setup(struct network *network,
return 0;
}
static int network_settings_load_pt_ecc(struct network *network,
const char *path,
unsigned int group,
struct l_ecc_point **out_pt)
{
_auto_(l_free) char *key = l_strdup_printf(SAE_PT_SETTING, group);
size_t pt_len;
_auto_(l_free) uint8_t *pt = l_settings_get_bytes(network->settings,
"Security", key, &pt_len);
const struct l_ecc_curve *curve = l_ecc_curve_from_ike_group((group));
if (!curve)
return -EINVAL;
if (!pt)
goto generate;
if (pt_len != l_ecc_curve_get_scalar_bytes(curve) * 2)
goto bad_format;
*out_pt = l_ecc_point_from_data(curve, L_ECC_POINT_TYPE_FULL,
pt, pt_len);
if (*out_pt)
return 0;
bad_format:
l_error("%s: invalid %s format", path, key);
generate:
if (!network->passphrase)
return -ENOKEY;
*out_pt = network_generate_sae_pt(network, group);
if (*out_pt)
return 1;
return -EIO;
}
static int network_load_psk(struct network *network, bool need_passphrase)
{
const char *ssid = network_get_ssid(network);
@ -523,10 +573,6 @@ static int network_load_psk(struct network *network, bool need_passphrase)
_auto_(l_free) char *passphrase =
l_settings_get_string(network->settings,
"Security", "Passphrase");
size_t pt19_len;
_auto_(l_free) uint8_t *pt19 =
l_settings_get_bytes(network->settings, "Security",
"SAE-PT-Group19", &pt19_len);
_auto_(l_free) char *path =
storage_get_network_file_path(security, ssid);
@ -552,29 +598,25 @@ static int network_load_psk(struct network *network, bool need_passphrase)
network_reset_psk(network);
network->passphrase = l_steal_ptr(passphrase);
if (pt19) {
const struct l_ecc_curve *curve =
l_ecc_curve_from_ike_group(19);
if (network_settings_load_pt_ecc(network, path,
19, &network->sae_pt_19) > 0)
network->sync_settings = true;
network->sae_pt_19 = l_ecc_point_from_data(curve,
L_ECC_POINT_TYPE_FULL,
pt19, pt19_len);
if (!network->sae_pt_19)
l_error("%s: invalid SAE-PT-Group19 format", path);
}
if (network->passphrase && !network->sae_pt_19)
network_generate_sae_pt_19(network);
if (network_settings_load_pt_ecc(network, path,
20, &network->sae_pt_20) > 0)
network->sync_settings = true;
network->psk = l_steal_ptr(psk);
return 0;
}
static void network_settings_save_sae_pt(struct l_settings *settings,
struct l_ecc_point *pt,
const char *key)
static void network_settings_save_sae_pt_ecc(struct l_settings *settings,
struct l_ecc_point *pt)
{
const struct l_ecc_curve *curve = l_ecc_point_get_curve(pt);
unsigned int group = l_ecc_curve_get_ike_group(curve);
_auto_(l_free) char *key = l_strdup_printf(SAE_PT_SETTING, group);
uint8_t buf[256];
ssize_t len;
@ -618,8 +660,10 @@ void network_sync_settings(struct network *network)
network->passphrase);
if (network->sae_pt_19)
network_settings_save_sae_pt(settings, network->sae_pt_19,
"SAE-PT-Group19");
network_settings_save_sae_pt_ecc(settings, network->sae_pt_19);
if (network->sae_pt_20)
network_settings_save_sae_pt_ecc(settings, network->sae_pt_20);
storage_network_sync(SECURITY_PSK, ssid, settings);