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wpa_supplicant: Add SAE handshake support for WPA3-PSK

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Under WPA3-Personal, SAE authentication is used to derive PMK
which is more secure and immune to offline dictionary attacks.
1. Add modules to generate SAE commit/confirm for the handshake
2. Add modules that build and parse SAE data in Auth frames
3. Add WPA3 association and key mgmt definitions
4. Invert y-bit while solving for ECC co-ordinate -
     Once an X co-ordinate is obtained, solving for Y co-ordinate
     using an elliptical curve equation results in 2 possible values,
     Y and (P - Y), where p is the prime number. The co-ordinates are
     used for deriving keys in SAE handshake. As par the 802.11 spec
     if LSB of X is same as LSB of Y then Y is chosen, (P - Y) otherwise.
     This is not what is implemented, so fix this behavior to obtain the
     correct Y co-ordinate.
This commit is contained in:
Nachiket Kukade
2019-11-21 12:41:12 +05:30
committed by bot
parent aceb141d2b
commit da07b2b4a7
14 changed files with 464 additions and 72 deletions
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21
components/wpa_supplicant/src/common/sae.h
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@@ -5,14 +5,12 @@
* This software may be distributed under the terms of the BSD license.
* See README for more details.
*/
#ifdef CONFIG_WPA3_SAE
#ifndef SAE_H
#define SAE_H
#include "esp_err.h"
#include "utils/includes.h"
#include "utils/common.h"
#include "utils/wpa_debug.h"
@@ -47,6 +45,7 @@ struct sae_temporary_data {
struct crypto_bignum *prime_buf;
struct crypto_bignum *order_buf;
struct wpabuf *anti_clogging_token;
char *pw_id;
};
enum {
@@ -54,32 +53,38 @@ enum {
SAE_MSG_CONFIRM = 2,
};
enum sae_state {
SAE_NOTHING, SAE_COMMITTED, SAE_CONFIRMED, SAE_ACCEPTED
};
struct sae_data {
enum { SAE_NOTHING, SAE_COMMITTED, SAE_CONFIRMED, SAE_ACCEPTED } state;
enum sae_state state;
u16 send_confirm;
u8 pmk[SAE_PMK_LEN];
u8 pmkid[SAE_PMKID_LEN];
struct crypto_bignum *peer_commit_scalar;
u16 group;
int sync;
int group;
unsigned int sync; /* protocol instance variable: Sync */
u16 rc; /* protocol instance variable: Rc (received send-confirm) */
struct sae_temporary_data *tmp;
};
int sae_set_group(struct sae_data *sae, u16 group);
int sae_set_group(struct sae_data *sae, int group);
void sae_clear_temp_data(struct sae_data *sae);
void sae_clear_data(struct sae_data *sae);
int sae_prepare_commit(const u8 *addr1, const u8 *addr2,
const u8 *password, size_t password_len,
struct sae_data *sae);
const char *identifier, struct sae_data *sae);
int sae_process_commit(struct sae_data *sae);
void sae_write_commit(struct sae_data *sae, struct wpabuf *buf,
const struct wpabuf *token);
const struct wpabuf *token, const char *identifier);
u16 sae_parse_commit(struct sae_data *sae, const u8 *data, size_t len,
const u8 **token, size_t *token_len, int *allowed_groups);
void sae_write_confirm(struct sae_data *sae, struct wpabuf *buf);
int sae_check_confirm(struct sae_data *sae, const u8 *data, size_t len);
u16 sae_group_allowed(struct sae_data *sae, int *allowed_groups, u16 group);
const char * sae_state_txt(enum sae_state state);
#endif /* SAE_H */
#endif /* CONFIG_WPA3_SAE */