hostap/src/common/dpp.h

/*
 * DPP functionality shared between hostapd and wpa_supplicant
 * Copyright (c) 2017, Qualcomm Atheros, Inc.
 *
 * This software may be distributed under the terms of the BSD license.
 * See README for more details.
 */

#ifndef DPP_H
#define DPP_H

#include <openssl/x509.h>

#include "utils/list.h"
#include "crypto/sha256.h"

/* DPP Public Action frame identifiers - OUI_WFA */
#define DPP_OUI_TYPE 0x1A

enum dpp_public_action_frame_type {
	DPP_PA_AUTHENTICATION_REQ = 0,
	DPP_PA_AUTHENTICATION_RESP = 1,
	DPP_PA_AUTHENTICATION_CONF = 2,
	DPP_PA_PEER_DISCOVERY_REQ = 5,
	DPP_PA_PEER_DISCOVERY_RESP = 6,
	DPP_PA_PKEX_EXCHANGE_REQ = 7,
	DPP_PA_PKEX_EXCHANGE_RESP = 8,
	DPP_PA_PKEX_COMMIT_REVEAL_REQ = 9,
	DPP_PA_PKEX_COMMIT_REVEAL_RESP = 10,
};

enum dpp_attribute_id {
	DPP_ATTR_STATUS = 0x1000,
	DPP_ATTR_I_BOOTSTRAP_KEY_HASH = 0x1001,
	DPP_ATTR_R_BOOTSTRAP_KEY_HASH = 0x1002,
	DPP_ATTR_I_PROTOCOL_KEY = 0x1003,
	DPP_ATTR_WRAPPED_DATA = 0x1004,
	DPP_ATTR_I_NONCE = 0x1005,
	DPP_ATTR_I_CAPABILITIES = 0x1006,
	DPP_ATTR_R_NONCE = 0x1007,
	DPP_ATTR_R_CAPABILITIES = 0x1008,
	DPP_ATTR_R_PROTOCOL_KEY = 0x1009,
	DPP_ATTR_I_AUTH_TAG = 0x100A,
	DPP_ATTR_R_AUTH_TAG = 0x100B,
	DPP_ATTR_CONFIG_OBJ = 0x100C,
	DPP_ATTR_CONNECTOR = 0x100D,
	DPP_ATTR_CONFIG_ATTR_OBJ = 0x100E,
	DPP_ATTR_BOOTSTRAP_KEY = 0x100F,
	DPP_ATTR_PEER_NET_PK_HASH = 0x1010,
	DPP_ATTR_OWN_NET_NK_HASH = 0x1011,
	DPP_ATTR_FINITE_CYCLIC_GROUP = 0x1012,
	DPP_ATTR_ENCRYPTED_KEY = 0x1013,
	DPP_ATTR_ENROLLEE_NONCE = 0x1014,
	DPP_ATTR_CODE_IDENTIFIER = 0x1015,
};

enum dpp_status_error {
	DPP_STATUS_OK = 0,
	DPP_STATUS_NOT_COMPATIBLE = 1,
	DPP_STATUS_AUTH_FAILURE = 2,
	DPP_STATUS_UNWRAP_FAILURE = 3,
	DPP_STATUS_BAD_GROUP = 4,
	DPP_STATUS_CONFIGURE_FAILURE = 5,
	DPP_STATUS_RESPONSE_PENDING = 6,
};

#define DPP_CAPAB_ENROLLEE BIT(0)
#define DPP_CAPAB_CONFIGURATOR BIT(1)
#define DPP_CAPAB_ROLE_MASK (BIT(0) | BIT(1))

#define DPP_BOOTSTRAP_MAX_FREQ 30
#define DPP_MAX_NONCE_LEN 32
#define DPP_MAX_HASH_LEN 64
#define DPP_MAX_SHARED_SECRET_LEN 66

struct dpp_curve_params {
	const char *name;
	size_t hash_len;
	size_t aes_siv_key_len;
	size_t nonce_len;
	size_t prime_len;
	const char *jwk_crv;
};

enum dpp_bootstrap_type {
	DPP_BOOTSTRAP_QR_CODE,
};

struct dpp_bootstrap_info {
	struct dl_list list;
	unsigned int id;
	enum dpp_bootstrap_type type;
	char *uri;
	u8 mac_addr[ETH_ALEN];
	char *info;
	unsigned int freq[DPP_BOOTSTRAP_MAX_FREQ];
	unsigned int num_freq;
	int own;
	EVP_PKEY *pubkey;
	u8 pubkey_hash[SHA256_MAC_LEN];
	const struct dpp_curve_params *curve;
};

struct dpp_authentication {
	void *msg_ctx;
	const struct dpp_curve_params *curve;
	struct dpp_bootstrap_info *peer_bi;
	struct dpp_bootstrap_info *own_bi;
	u8 waiting_pubkey_hash[SHA256_MAC_LEN];
	int response_pending;
	enum dpp_status_error auth_resp_status;
	u8 peer_mac_addr[ETH_ALEN];
	u8 i_nonce[DPP_MAX_NONCE_LEN];
	u8 r_nonce[DPP_MAX_NONCE_LEN];
	u8 i_capab;
	u8 r_capab;
	EVP_PKEY *own_protocol_key;
	EVP_PKEY *peer_protocol_key;
	struct wpabuf *req_attr;
	struct wpabuf *resp_attr;
	unsigned int curr_freq;
	size_t secret_len;
	u8 Mx[DPP_MAX_SHARED_SECRET_LEN];
	u8 Nx[DPP_MAX_SHARED_SECRET_LEN];
	u8 Lx[DPP_MAX_SHARED_SECRET_LEN];
	u8 k1[DPP_MAX_HASH_LEN];
	u8 k2[DPP_MAX_HASH_LEN];
	u8 ke[DPP_MAX_HASH_LEN];
	int initiator;
	int configurator;
	int remove_on_tx_status;
	int auth_success;
};

void dpp_bootstrap_info_free(struct dpp_bootstrap_info *info);
int dpp_parse_uri_chan_list(struct dpp_bootstrap_info *bi,
			    const char *chan_list);
int dpp_parse_uri_mac(struct dpp_bootstrap_info *bi, const char *mac);
int dpp_parse_uri_info(struct dpp_bootstrap_info *bi, const char *info);
struct dpp_bootstrap_info * dpp_parse_qr_code(const char *uri);
char * dpp_keygen(struct dpp_bootstrap_info *bi, const char *curve,
		  const u8 *privkey, size_t privkey_len);
struct dpp_authentication * dpp_auth_init(void *msg_ctx,
					  struct dpp_bootstrap_info *peer_bi,
					  struct dpp_bootstrap_info *own_bi,
					  int configurator);
struct dpp_authentication *
dpp_auth_req_rx(void *msg_ctx, u8 dpp_allowed_roles, int qr_mutual,
		struct dpp_bootstrap_info *peer_bi,
		struct dpp_bootstrap_info *own_bi,
		unsigned int freq, const u8 *attr_start,
		const u8 *wrapped_data, u16 wrapped_data_len);
struct wpabuf *
dpp_auth_resp_rx(struct dpp_authentication *auth, const u8 *attr_start,
		 size_t attr_len);
int dpp_auth_conf_rx(struct dpp_authentication *auth, const u8 *attr_start,
		     size_t attr_len);
int dpp_notify_new_qr_code(struct dpp_authentication *auth,
			   struct dpp_bootstrap_info *peer_bi);
void dpp_auth_deinit(struct dpp_authentication *auth);
struct wpabuf * dpp_alloc_msg(enum dpp_public_action_frame_type type,
			      size_t len);
const u8 * dpp_get_attr(const u8 *buf, size_t len, u16 req_id, u16 *ret_len);
int dpp_check_attrs(const u8 *buf, size_t len);

#endif /* DPP_H */