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00015 #include "includes.h"
00016
00017 #include "common.h"
00018 #include "crypto/aes_wrap.h"
00019 #include "crypto/crypto.h"
00020 #include "crypto/dh_group5.h"
00021 #include "crypto/sha256.h"
00022 #include "wps_i.h"
00023
00024
00025 int wps_build_public_key(struct wps_data *wps, struct wpabuf *msg)
00026 {
00027 struct wpabuf *pubkey;
00028
00029 wpa_printf(MSG_DEBUG, "WPS: * Public Key");
00030 wpabuf_free(wps->dh_privkey);
00031 if (wps->dev_pw_id != DEV_PW_DEFAULT && wps->wps->dh_privkey) {
00032 wpa_printf(MSG_DEBUG, "WPS: Using pre-configured DH keys");
00033 wps->dh_privkey = wpabuf_dup(wps->wps->dh_privkey);
00034 wps->dh_ctx = wps->wps->dh_ctx;
00035 wps->wps->dh_ctx = NULL;
00036 pubkey = wpabuf_dup(wps->wps->dh_pubkey);
00037 } else {
00038 wpa_printf(MSG_DEBUG, "WPS: Generate new DH keys");
00039 wps->dh_privkey = NULL;
00040 dh5_free(wps->dh_ctx);
00041 wps->dh_ctx = dh5_init(&wps->dh_privkey, &pubkey);
00042 pubkey = wpabuf_zeropad(pubkey, 192);
00043 }
00044 if (wps->dh_ctx == NULL || wps->dh_privkey == NULL || pubkey == NULL) {
00045 wpa_printf(MSG_DEBUG, "WPS: Failed to initialize "
00046 "Diffie-Hellman handshake");
00047 wpabuf_free(pubkey);
00048 return -1;
00049 }
00050
00051 wpabuf_put_be16(msg, ATTR_PUBLIC_KEY);
00052 wpabuf_put_be16(msg, wpabuf_len(pubkey));
00053 wpabuf_put_buf(msg, pubkey);
00054
00055 if (wps->registrar) {
00056 wpabuf_free(wps->dh_pubkey_r);
00057 wps->dh_pubkey_r = pubkey;
00058 } else {
00059 wpabuf_free(wps->dh_pubkey_e);
00060 wps->dh_pubkey_e = pubkey;
00061 }
00062
00063 return 0;
00064 }
00065
00066
00067 int wps_build_req_type(struct wpabuf *msg, enum wps_request_type type)
00068 {
00069 wpa_printf(MSG_DEBUG, "WPS: * Request Type");
00070 wpabuf_put_be16(msg, ATTR_REQUEST_TYPE);
00071 wpabuf_put_be16(msg, 1);
00072 wpabuf_put_u8(msg, type);
00073 return 0;
00074 }
00075
00076
00077 int wps_build_config_methods(struct wpabuf *msg, u16 methods)
00078 {
00079 wpa_printf(MSG_DEBUG, "WPS: * Config Methods (%x)", methods);
00080 wpabuf_put_be16(msg, ATTR_CONFIG_METHODS);
00081 wpabuf_put_be16(msg, 2);
00082 wpabuf_put_be16(msg, methods);
00083 return 0;
00084 }
00085
00086
00087 int wps_build_uuid_e(struct wpabuf *msg, const u8 *uuid)
00088 {
00089 wpa_printf(MSG_DEBUG, "WPS: * UUID-E");
00090 wpabuf_put_be16(msg, ATTR_UUID_E);
00091 wpabuf_put_be16(msg, WPS_UUID_LEN);
00092 wpabuf_put_data(msg, uuid, WPS_UUID_LEN);
00093 return 0;
00094 }
00095
00096
00097 int wps_build_dev_password_id(struct wpabuf *msg, u16 id)
00098 {
00099 wpa_printf(MSG_DEBUG, "WPS: * Device Password ID (%d)", id);
00100 wpabuf_put_be16(msg, ATTR_DEV_PASSWORD_ID);
00101 wpabuf_put_be16(msg, 2);
00102 wpabuf_put_be16(msg, id);
00103 return 0;
00104 }
00105
00106
00107 int wps_build_config_error(struct wpabuf *msg, u16 err)
00108 {
00109 wpa_printf(MSG_DEBUG, "WPS: * Configuration Error (%d)", err);
00110 wpabuf_put_be16(msg, ATTR_CONFIG_ERROR);
00111 wpabuf_put_be16(msg, 2);
00112 wpabuf_put_be16(msg, err);
00113 return 0;
00114 }
00115
00116
00117 int wps_build_authenticator(struct wps_data *wps, struct wpabuf *msg)
00118 {
00119 u8 hash[SHA256_MAC_LEN];
00120 const u8 *addr[2];
00121 size_t len[2];
00122
00123 if (wps->last_msg == NULL) {
00124 wpa_printf(MSG_DEBUG, "WPS: Last message not available for "
00125 "building authenticator");
00126 return -1;
00127 }
00128
00129
00130
00131
00132 addr[0] = wpabuf_head(wps->last_msg);
00133 len[0] = wpabuf_len(wps->last_msg);
00134 addr[1] = wpabuf_head(msg);
00135 len[1] = wpabuf_len(msg);
00136 hmac_sha256_vector(wps->authkey, WPS_AUTHKEY_LEN, 2, addr, len, hash);
00137
00138 wpa_printf(MSG_DEBUG, "WPS: * Authenticator");
00139 wpabuf_put_be16(msg, ATTR_AUTHENTICATOR);
00140 wpabuf_put_be16(msg, WPS_AUTHENTICATOR_LEN);
00141 wpabuf_put_data(msg, hash, WPS_AUTHENTICATOR_LEN);
00142
00143 return 0;
00144 }
00145
00146
00147 int wps_build_version(struct wpabuf *msg)
00148 {
00149 wpa_printf(MSG_DEBUG, "WPS: * Version");
00150 wpabuf_put_be16(msg, ATTR_VERSION);
00151 wpabuf_put_be16(msg, 1);
00152 wpabuf_put_u8(msg, WPS_VERSION);
00153 return 0;
00154 }
00155
00156
00157 int wps_build_msg_type(struct wpabuf *msg, enum wps_msg_type msg_type)
00158 {
00159 wpa_printf(MSG_DEBUG, "WPS: * Message Type (%d)", msg_type);
00160 wpabuf_put_be16(msg, ATTR_MSG_TYPE);
00161 wpabuf_put_be16(msg, 1);
00162 wpabuf_put_u8(msg, msg_type);
00163 return 0;
00164 }
00165
00166
00167 int wps_build_enrollee_nonce(struct wps_data *wps, struct wpabuf *msg)
00168 {
00169 wpa_printf(MSG_DEBUG, "WPS: * Enrollee Nonce");
00170 wpabuf_put_be16(msg, ATTR_ENROLLEE_NONCE);
00171 wpabuf_put_be16(msg, WPS_NONCE_LEN);
00172 wpabuf_put_data(msg, wps->nonce_e, WPS_NONCE_LEN);
00173 return 0;
00174 }
00175
00176
00177 int wps_build_registrar_nonce(struct wps_data *wps, struct wpabuf *msg)
00178 {
00179 wpa_printf(MSG_DEBUG, "WPS: * Registrar Nonce");
00180 wpabuf_put_be16(msg, ATTR_REGISTRAR_NONCE);
00181 wpabuf_put_be16(msg, WPS_NONCE_LEN);
00182 wpabuf_put_data(msg, wps->nonce_r, WPS_NONCE_LEN);
00183 return 0;
00184 }
00185
00186
00187 int wps_build_auth_type_flags(struct wps_data *wps, struct wpabuf *msg)
00188 {
00189 wpa_printf(MSG_DEBUG, "WPS: * Authentication Type Flags");
00190 wpabuf_put_be16(msg, ATTR_AUTH_TYPE_FLAGS);
00191 wpabuf_put_be16(msg, 2);
00192 wpabuf_put_be16(msg, WPS_AUTH_TYPES);
00193 return 0;
00194 }
00195
00196
00197 int wps_build_encr_type_flags(struct wps_data *wps, struct wpabuf *msg)
00198 {
00199 wpa_printf(MSG_DEBUG, "WPS: * Encryption Type Flags");
00200 wpabuf_put_be16(msg, ATTR_ENCR_TYPE_FLAGS);
00201 wpabuf_put_be16(msg, 2);
00202 wpabuf_put_be16(msg, WPS_ENCR_TYPES);
00203 return 0;
00204 }
00205
00206
00207 int wps_build_conn_type_flags(struct wps_data *wps, struct wpabuf *msg)
00208 {
00209 wpa_printf(MSG_DEBUG, "WPS: * Connection Type Flags");
00210 wpabuf_put_be16(msg, ATTR_CONN_TYPE_FLAGS);
00211 wpabuf_put_be16(msg, 1);
00212 wpabuf_put_u8(msg, WPS_CONN_ESS);
00213 return 0;
00214 }
00215
00216
00217 int wps_build_assoc_state(struct wps_data *wps, struct wpabuf *msg)
00218 {
00219 wpa_printf(MSG_DEBUG, "WPS: * Association State");
00220 wpabuf_put_be16(msg, ATTR_ASSOC_STATE);
00221 wpabuf_put_be16(msg, 2);
00222 wpabuf_put_be16(msg, WPS_ASSOC_NOT_ASSOC);
00223 return 0;
00224 }
00225
00226
00227 int wps_build_key_wrap_auth(struct wps_data *wps, struct wpabuf *msg)
00228 {
00229 u8 hash[SHA256_MAC_LEN];
00230
00231 wpa_printf(MSG_DEBUG, "WPS: * Key Wrap Authenticator");
00232 hmac_sha256(wps->authkey, WPS_AUTHKEY_LEN, wpabuf_head(msg),
00233 wpabuf_len(msg), hash);
00234
00235 wpabuf_put_be16(msg, ATTR_KEY_WRAP_AUTH);
00236 wpabuf_put_be16(msg, WPS_KWA_LEN);
00237 wpabuf_put_data(msg, hash, WPS_KWA_LEN);
00238 return 0;
00239 }
00240
00241
00242 int wps_build_encr_settings(struct wps_data *wps, struct wpabuf *msg,
00243 struct wpabuf *plain)
00244 {
00245 size_t pad_len;
00246 const size_t block_size = 16;
00247 u8 *iv, *data;
00248
00249 wpa_printf(MSG_DEBUG, "WPS: * Encrypted Settings");
00250
00251
00252 pad_len = block_size - wpabuf_len(plain) % block_size;
00253 os_memset(wpabuf_put(plain, pad_len), pad_len, pad_len);
00254
00255 wpabuf_put_be16(msg, ATTR_ENCR_SETTINGS);
00256 wpabuf_put_be16(msg, block_size + wpabuf_len(plain));
00257
00258 iv = wpabuf_put(msg, block_size);
00259 if (os_get_random(iv, block_size) < 0)
00260 return -1;
00261
00262 data = wpabuf_put(msg, 0);
00263 wpabuf_put_buf(msg, plain);
00264 if (aes_128_cbc_encrypt(wps->keywrapkey, iv, data, wpabuf_len(plain)))
00265 return -1;
00266
00267 return 0;
00268 }
00269
00270
00271 #ifdef CONFIG_WPS_OOB
00272 int wps_build_oob_dev_password(struct wpabuf *msg, struct wps_context *wps)
00273 {
00274 size_t hash_len;
00275 const u8 *addr[1];
00276 u8 pubkey_hash[WPS_HASH_LEN];
00277 u8 dev_password_bin[WPS_OOB_DEVICE_PASSWORD_LEN];
00278
00279 wpa_printf(MSG_DEBUG, "WPS: * OOB Device Password");
00280
00281 addr[0] = wpabuf_head(wps->dh_pubkey);
00282 hash_len = wpabuf_len(wps->dh_pubkey);
00283 sha256_vector(1, addr, &hash_len, pubkey_hash);
00284
00285 if (os_get_random((u8 *) &wps->oob_dev_pw_id, sizeof(u16)) < 0) {
00286 wpa_printf(MSG_ERROR, "WPS: device password id "
00287 "generation error");
00288 return -1;
00289 }
00290 wps->oob_dev_pw_id |= 0x0010;
00291
00292 if (os_get_random(dev_password_bin, WPS_OOB_DEVICE_PASSWORD_LEN) < 0) {
00293 wpa_printf(MSG_ERROR, "WPS: OOB device password "
00294 "generation error");
00295 return -1;
00296 }
00297
00298 wpabuf_put_be16(msg, ATTR_OOB_DEVICE_PASSWORD);
00299 wpabuf_put_be16(msg, WPS_OOB_DEVICE_PASSWORD_ATTR_LEN);
00300 wpabuf_put_data(msg, pubkey_hash, WPS_OOB_PUBKEY_HASH_LEN);
00301 wpabuf_put_be16(msg, wps->oob_dev_pw_id);
00302 wpabuf_put_data(msg, dev_password_bin, WPS_OOB_DEVICE_PASSWORD_LEN);
00303
00304 wpa_snprintf_hex_uppercase(
00305 wpabuf_put(wps->oob_conf.dev_password,
00306 wpabuf_size(wps->oob_conf.dev_password)),
00307 wpabuf_size(wps->oob_conf.dev_password),
00308 dev_password_bin, WPS_OOB_DEVICE_PASSWORD_LEN);
00309
00310 return 0;
00311 }
00312 #endif