1 /* 2 * DPP functionality shared between hostapd and wpa_supplicant 3 * Copyright (c) 2017, Qualcomm Atheros, Inc. 4 * 5 * This software may be distributed under the terms of the BSD license. 6 * See README for more details. 7 */ 8 9 #ifndef DPP_H 10 #define DPP_H 11 12 #include <openssl/x509.h> 13 14 #include "utils/list.h" 15 #include "common/wpa_common.h" 16 #include "crypto/sha256.h" 17 18 #define DPP_HDR_LEN (4 + 2) /* OUI, OUI Type, Crypto Suite, DPP frame type */ 19 20 enum dpp_public_action_frame_type { 21 DPP_PA_AUTHENTICATION_REQ = 0, 22 DPP_PA_AUTHENTICATION_RESP = 1, 23 DPP_PA_AUTHENTICATION_CONF = 2, 24 DPP_PA_PEER_DISCOVERY_REQ = 5, 25 DPP_PA_PEER_DISCOVERY_RESP = 6, 26 DPP_PA_PKEX_EXCHANGE_REQ = 7, 27 DPP_PA_PKEX_EXCHANGE_RESP = 8, 28 DPP_PA_PKEX_COMMIT_REVEAL_REQ = 9, 29 DPP_PA_PKEX_COMMIT_REVEAL_RESP = 10, 30 }; 31 32 enum dpp_attribute_id { 33 DPP_ATTR_STATUS = 0x1000, 34 DPP_ATTR_I_BOOTSTRAP_KEY_HASH = 0x1001, 35 DPP_ATTR_R_BOOTSTRAP_KEY_HASH = 0x1002, 36 DPP_ATTR_I_PROTOCOL_KEY = 0x1003, 37 DPP_ATTR_WRAPPED_DATA = 0x1004, 38 DPP_ATTR_I_NONCE = 0x1005, 39 DPP_ATTR_I_CAPABILITIES = 0x1006, 40 DPP_ATTR_R_NONCE = 0x1007, 41 DPP_ATTR_R_CAPABILITIES = 0x1008, 42 DPP_ATTR_R_PROTOCOL_KEY = 0x1009, 43 DPP_ATTR_I_AUTH_TAG = 0x100A, 44 DPP_ATTR_R_AUTH_TAG = 0x100B, 45 DPP_ATTR_CONFIG_OBJ = 0x100C, 46 DPP_ATTR_CONNECTOR = 0x100D, 47 DPP_ATTR_CONFIG_ATTR_OBJ = 0x100E, 48 DPP_ATTR_BOOTSTRAP_KEY = 0x100F, 49 DPP_ATTR_OWN_NET_NK_HASH = 0x1011, 50 DPP_ATTR_FINITE_CYCLIC_GROUP = 0x1012, 51 DPP_ATTR_ENCRYPTED_KEY = 0x1013, 52 DPP_ATTR_ENROLLEE_NONCE = 0x1014, 53 DPP_ATTR_CODE_IDENTIFIER = 0x1015, 54 DPP_ATTR_TRANSACTION_ID = 0x1016, 55 }; 56 57 enum dpp_status_error { 58 DPP_STATUS_OK = 0, 59 DPP_STATUS_NOT_COMPATIBLE = 1, 60 DPP_STATUS_AUTH_FAILURE = 2, 61 DPP_STATUS_UNWRAP_FAILURE = 3, 62 DPP_STATUS_BAD_GROUP = 4, 63 DPP_STATUS_CONFIGURE_FAILURE = 5, 64 DPP_STATUS_RESPONSE_PENDING = 6, 65 }; 66 67 #define DPP_CAPAB_ENROLLEE BIT(0) 68 #define DPP_CAPAB_CONFIGURATOR BIT(1) 69 #define DPP_CAPAB_ROLE_MASK (BIT(0) | BIT(1)) 70 71 #define DPP_BOOTSTRAP_MAX_FREQ 30 72 #define DPP_MAX_NONCE_LEN 32 73 #define DPP_MAX_HASH_LEN 64 74 #define DPP_MAX_SHARED_SECRET_LEN 66 75 76 struct dpp_curve_params { 77 const char *name; 78 size_t hash_len; 79 size_t aes_siv_key_len; 80 size_t nonce_len; 81 size_t prime_len; 82 const char *jwk_crv; 83 u16 ike_group; 84 const char *jws_alg; 85 }; 86 87 enum dpp_bootstrap_type { 88 DPP_BOOTSTRAP_QR_CODE, 89 DPP_BOOTSTRAP_PKEX, 90 }; 91 92 struct dpp_bootstrap_info { 93 struct dl_list list; 94 unsigned int id; 95 enum dpp_bootstrap_type type; 96 char *uri; 97 u8 mac_addr[ETH_ALEN]; 98 char *info; 99 unsigned int freq[DPP_BOOTSTRAP_MAX_FREQ]; 100 unsigned int num_freq; 101 int own; 102 EVP_PKEY *pubkey; 103 u8 pubkey_hash[SHA256_MAC_LEN]; 104 const struct dpp_curve_params *curve; 105 }; 106 107 struct dpp_pkex { 108 unsigned int initiator:1; 109 unsigned int exchange_done:1; 110 struct dpp_bootstrap_info *own_bi; 111 u8 own_mac[ETH_ALEN]; 112 u8 peer_mac[ETH_ALEN]; 113 char *identifier; 114 char *code; 115 EVP_PKEY *x; 116 EVP_PKEY *y; 117 u8 Mx[DPP_MAX_SHARED_SECRET_LEN]; 118 u8 Nx[DPP_MAX_SHARED_SECRET_LEN]; 119 u8 z[DPP_MAX_HASH_LEN]; 120 EVP_PKEY *peer_bootstrap_key; 121 struct wpabuf *exchange_req; 122 struct wpabuf *exchange_resp; 123 }; 124 125 struct dpp_configuration { 126 u8 ssid[32]; 127 size_t ssid_len; 128 int dpp; /* whether to use DPP or legacy configuration */ 129 130 /* For DPP configuration (connector) */ 131 os_time_t netaccesskey_expiry; 132 133 /* TODO: groups */ 134 135 /* For legacy configuration */ 136 char *passphrase; 137 u8 psk[32]; 138 }; 139 140 struct dpp_authentication { 141 void *msg_ctx; 142 const struct dpp_curve_params *curve; 143 struct dpp_bootstrap_info *peer_bi; 144 struct dpp_bootstrap_info *own_bi; 145 u8 waiting_pubkey_hash[SHA256_MAC_LEN]; 146 int response_pending; 147 enum dpp_status_error auth_resp_status; 148 u8 peer_mac_addr[ETH_ALEN]; 149 u8 i_nonce[DPP_MAX_NONCE_LEN]; 150 u8 r_nonce[DPP_MAX_NONCE_LEN]; 151 u8 e_nonce[DPP_MAX_NONCE_LEN]; 152 u8 i_capab; 153 u8 r_capab; 154 EVP_PKEY *own_protocol_key; 155 EVP_PKEY *peer_protocol_key; 156 struct wpabuf *req_msg; 157 struct wpabuf *resp_msg; 158 unsigned int curr_freq; 159 size_t secret_len; 160 u8 Mx[DPP_MAX_SHARED_SECRET_LEN]; 161 u8 Nx[DPP_MAX_SHARED_SECRET_LEN]; 162 u8 Lx[DPP_MAX_SHARED_SECRET_LEN]; 163 u8 k1[DPP_MAX_HASH_LEN]; 164 u8 k2[DPP_MAX_HASH_LEN]; 165 u8 ke[DPP_MAX_HASH_LEN]; 166 int initiator; 167 int configurator; 168 int remove_on_tx_status; 169 int auth_success; 170 struct wpabuf *conf_req; 171 struct dpp_configuration *conf_ap; 172 struct dpp_configuration *conf_sta; 173 struct dpp_configurator *conf; 174 char *connector; /* received signedConnector */ 175 u8 ssid[SSID_MAX_LEN]; 176 u8 ssid_len; 177 char passphrase[64]; 178 u8 psk[PMK_LEN]; 179 int psk_set; 180 struct wpabuf *net_access_key; 181 os_time_t net_access_key_expiry; 182 struct wpabuf *c_sign_key; 183 #ifdef CONFIG_TESTING_OPTIONS 184 char *config_obj_override; 185 char *discovery_override; 186 char *groups_override; 187 unsigned int ignore_netaccesskey_mismatch:1; 188 #endif /* CONFIG_TESTING_OPTIONS */ 189 }; 190 191 struct dpp_configurator { 192 struct dl_list list; 193 unsigned int id; 194 int own; 195 EVP_PKEY *csign; 196 char *kid; 197 const struct dpp_curve_params *curve; 198 }; 199 200 struct dpp_introduction { 201 u8 pmkid[PMKID_LEN]; 202 u8 pmk[PMK_LEN_MAX]; 203 size_t pmk_len; 204 }; 205 206 void dpp_bootstrap_info_free(struct dpp_bootstrap_info *info); 207 const char * dpp_bootstrap_type_txt(enum dpp_bootstrap_type type); 208 int dpp_bootstrap_key_hash(struct dpp_bootstrap_info *bi); 209 int dpp_parse_uri_chan_list(struct dpp_bootstrap_info *bi, 210 const char *chan_list); 211 int dpp_parse_uri_mac(struct dpp_bootstrap_info *bi, const char *mac); 212 int dpp_parse_uri_info(struct dpp_bootstrap_info *bi, const char *info); 213 struct dpp_bootstrap_info * dpp_parse_qr_code(const char *uri); 214 char * dpp_keygen(struct dpp_bootstrap_info *bi, const char *curve, 215 const u8 *privkey, size_t privkey_len); 216 struct dpp_authentication * dpp_auth_init(void *msg_ctx, 217 struct dpp_bootstrap_info *peer_bi, 218 struct dpp_bootstrap_info *own_bi, 219 int configurator); 220 struct dpp_authentication * 221 dpp_auth_req_rx(void *msg_ctx, u8 dpp_allowed_roles, int qr_mutual, 222 struct dpp_bootstrap_info *peer_bi, 223 struct dpp_bootstrap_info *own_bi, 224 unsigned int freq, const u8 *hdr, const u8 *attr_start, 225 const u8 *wrapped_data, u16 wrapped_data_len); 226 struct wpabuf * 227 dpp_auth_resp_rx(struct dpp_authentication *auth, const u8 *hdr, 228 const u8 *attr_start, size_t attr_len); 229 struct wpabuf * dpp_build_conf_req(struct dpp_authentication *auth, 230 const char *json); 231 int dpp_auth_conf_rx(struct dpp_authentication *auth, const u8 *hdr, 232 const u8 *attr_start, size_t attr_len); 233 int dpp_notify_new_qr_code(struct dpp_authentication *auth, 234 struct dpp_bootstrap_info *peer_bi); 235 void dpp_configuration_free(struct dpp_configuration *conf); 236 void dpp_auth_deinit(struct dpp_authentication *auth); 237 struct wpabuf * 238 dpp_conf_req_rx(struct dpp_authentication *auth, const u8 *attr_start, 239 size_t attr_len); 240 int dpp_conf_resp_rx(struct dpp_authentication *auth, 241 const struct wpabuf *resp); 242 struct wpabuf * dpp_alloc_msg(enum dpp_public_action_frame_type type, 243 size_t len); 244 const u8 * dpp_get_attr(const u8 *buf, size_t len, u16 req_id, u16 *ret_len); 245 int dpp_check_attrs(const u8 *buf, size_t len); 246 int dpp_key_expired(const char *timestamp, os_time_t *expiry); 247 void dpp_configurator_free(struct dpp_configurator *conf); 248 struct dpp_configurator * 249 dpp_keygen_configurator(const char *curve, const u8 *privkey, 250 size_t privkey_len); 251 int dpp_configurator_own_config(struct dpp_authentication *auth, 252 const char *curve); 253 int dpp_peer_intro(struct dpp_introduction *intro, const char *own_connector, 254 const u8 *net_access_key, size_t net_access_key_len, 255 const u8 *csign_key, size_t csign_key_len, 256 const u8 *peer_connector, size_t peer_connector_len, 257 os_time_t *expiry); 258 struct dpp_pkex * dpp_pkex_init(struct dpp_bootstrap_info *bi, 259 const u8 *own_mac, 260 const char *identifier, 261 const char *code); 262 struct dpp_pkex * dpp_pkex_rx_exchange_req(struct dpp_bootstrap_info *bi, 263 const u8 *own_mac, 264 const u8 *peer_mac, 265 const char *identifier, 266 const char *code, 267 const u8 *buf, size_t len); 268 struct wpabuf * dpp_pkex_rx_exchange_resp(struct dpp_pkex *pkex, 269 const u8 *buf, size_t len); 270 struct wpabuf * dpp_pkex_rx_commit_reveal_req(struct dpp_pkex *pkex, 271 const u8 *hdr, 272 const u8 *buf, size_t len); 273 int dpp_pkex_rx_commit_reveal_resp(struct dpp_pkex *pkex, const u8 *hdr, 274 const u8 *buf, size_t len); 275 void dpp_pkex_free(struct dpp_pkex *pkex); 276 277 #endif /* DPP_H */ 278
