1252190Srpaulo/* 2252190Srpaulo * EAP peer method: EAP-pwd (RFC 5931) 3252190Srpaulo * Copyright (c) 2010, Dan Harkins <dharkins@lounge.org> 4252190Srpaulo * 5252190Srpaulo * This software may be distributed under the terms of the BSD license. 6252190Srpaulo * See README for more details. 7252190Srpaulo */ 8252190Srpaulo 9252190Srpaulo#include "includes.h" 10252190Srpaulo 11252190Srpaulo#include "common.h" 12252190Srpaulo#include "crypto/sha256.h" 13252190Srpaulo#include "eap_peer/eap_i.h" 14252190Srpaulo#include "eap_common/eap_pwd_common.h" 15252190Srpaulo 16252190Srpaulo 17252190Srpaulostruct eap_pwd_data { 18252190Srpaulo enum { 19252190Srpaulo PWD_ID_Req, PWD_Commit_Req, PWD_Confirm_Req, SUCCESS, FAILURE 20252190Srpaulo } state; 21252190Srpaulo u8 *id_peer; 22252190Srpaulo size_t id_peer_len; 23252190Srpaulo u8 *id_server; 24252190Srpaulo size_t id_server_len; 25252190Srpaulo u8 *password; 26252190Srpaulo size_t password_len; 27252190Srpaulo u16 group_num; 28252190Srpaulo EAP_PWD_group *grp; 29252190Srpaulo 30252190Srpaulo struct wpabuf *inbuf; 31252190Srpaulo size_t in_frag_pos; 32252190Srpaulo struct wpabuf *outbuf; 33252190Srpaulo size_t out_frag_pos; 34252190Srpaulo size_t mtu; 35252190Srpaulo 36252190Srpaulo BIGNUM *k; 37252190Srpaulo BIGNUM *private_value; 38252190Srpaulo BIGNUM *server_scalar; 39252190Srpaulo BIGNUM *my_scalar; 40252190Srpaulo EC_POINT *my_element; 41252190Srpaulo EC_POINT *server_element; 42252190Srpaulo 43252190Srpaulo u8 msk[EAP_MSK_LEN]; 44252190Srpaulo u8 emsk[EAP_EMSK_LEN]; 45252190Srpaulo 46252190Srpaulo BN_CTX *bnctx; 47252190Srpaulo}; 48252190Srpaulo 49252190Srpaulo 50252190Srpaulo#ifndef CONFIG_NO_STDOUT_DEBUG 51252190Srpaulostatic const char * eap_pwd_state_txt(int state) 52252190Srpaulo{ 53252190Srpaulo switch (state) { 54252190Srpaulo case PWD_ID_Req: 55252190Srpaulo return "PWD-ID-Req"; 56252190Srpaulo case PWD_Commit_Req: 57252190Srpaulo return "PWD-Commit-Req"; 58252190Srpaulo case PWD_Confirm_Req: 59252190Srpaulo return "PWD-Confirm-Req"; 60252190Srpaulo case SUCCESS: 61252190Srpaulo return "SUCCESS"; 62252190Srpaulo case FAILURE: 63252190Srpaulo return "FAILURE"; 64252190Srpaulo default: 65252190Srpaulo return "PWD-UNK"; 66252190Srpaulo } 67252190Srpaulo} 68252190Srpaulo#endif /* CONFIG_NO_STDOUT_DEBUG */ 69252190Srpaulo 70252190Srpaulo 71252190Srpaulostatic void eap_pwd_state(struct eap_pwd_data *data, int state) 72252190Srpaulo{ 73252190Srpaulo wpa_printf(MSG_DEBUG, "EAP-PWD: %s -> %s", 74252190Srpaulo eap_pwd_state_txt(data->state), eap_pwd_state_txt(state)); 75252190Srpaulo data->state = state; 76252190Srpaulo} 77252190Srpaulo 78252190Srpaulo 79252190Srpaulostatic void * eap_pwd_init(struct eap_sm *sm) 80252190Srpaulo{ 81252190Srpaulo struct eap_pwd_data *data; 82252190Srpaulo const u8 *identity, *password; 83252190Srpaulo size_t identity_len, password_len; 84252190Srpaulo 85252190Srpaulo password = eap_get_config_password(sm, &password_len); 86252190Srpaulo if (password == NULL) { 87252190Srpaulo wpa_printf(MSG_INFO, "EAP-PWD: No password configured!"); 88252190Srpaulo return NULL; 89252190Srpaulo } 90252190Srpaulo 91252190Srpaulo identity = eap_get_config_identity(sm, &identity_len); 92252190Srpaulo if (identity == NULL) { 93252190Srpaulo wpa_printf(MSG_INFO, "EAP-PWD: No identity configured!"); 94252190Srpaulo return NULL; 95252190Srpaulo } 96252190Srpaulo 97252190Srpaulo if ((data = os_zalloc(sizeof(*data))) == NULL) { 98252190Srpaulo wpa_printf(MSG_INFO, "EAP-PWD: memory allocation data fail"); 99252190Srpaulo return NULL; 100252190Srpaulo } 101252190Srpaulo 102252190Srpaulo if ((data->bnctx = BN_CTX_new()) == NULL) { 103252190Srpaulo wpa_printf(MSG_INFO, "EAP-PWD: bn context allocation fail"); 104252190Srpaulo os_free(data); 105252190Srpaulo return NULL; 106252190Srpaulo } 107252190Srpaulo 108252190Srpaulo if ((data->id_peer = os_malloc(identity_len)) == NULL) { 109252190Srpaulo wpa_printf(MSG_INFO, "EAP-PWD: memory allocation id fail"); 110252190Srpaulo BN_CTX_free(data->bnctx); 111252190Srpaulo os_free(data); 112252190Srpaulo return NULL; 113252190Srpaulo } 114252190Srpaulo 115252190Srpaulo os_memcpy(data->id_peer, identity, identity_len); 116252190Srpaulo data->id_peer_len = identity_len; 117252190Srpaulo 118252190Srpaulo if ((data->password = os_malloc(password_len)) == NULL) { 119252190Srpaulo wpa_printf(MSG_INFO, "EAP-PWD: memory allocation psk fail"); 120252190Srpaulo BN_CTX_free(data->bnctx); 121252190Srpaulo os_free(data->id_peer); 122252190Srpaulo os_free(data); 123252190Srpaulo return NULL; 124252190Srpaulo } 125252190Srpaulo os_memcpy(data->password, password, password_len); 126252190Srpaulo data->password_len = password_len; 127252190Srpaulo 128252190Srpaulo data->out_frag_pos = data->in_frag_pos = 0; 129252190Srpaulo data->inbuf = data->outbuf = NULL; 130252190Srpaulo data->mtu = 1020; /* default from RFC 5931, make it configurable! */ 131252190Srpaulo 132252190Srpaulo data->state = PWD_ID_Req; 133252190Srpaulo 134252190Srpaulo return data; 135252190Srpaulo} 136252190Srpaulo 137252190Srpaulo 138252190Srpaulostatic void eap_pwd_deinit(struct eap_sm *sm, void *priv) 139252190Srpaulo{ 140252190Srpaulo struct eap_pwd_data *data = priv; 141252190Srpaulo 142252190Srpaulo BN_free(data->private_value); 143252190Srpaulo BN_free(data->server_scalar); 144252190Srpaulo BN_free(data->my_scalar); 145252190Srpaulo BN_free(data->k); 146252190Srpaulo BN_CTX_free(data->bnctx); 147252190Srpaulo EC_POINT_free(data->my_element); 148252190Srpaulo EC_POINT_free(data->server_element); 149252190Srpaulo os_free(data->id_peer); 150252190Srpaulo os_free(data->id_server); 151252190Srpaulo os_free(data->password); 152252190Srpaulo if (data->grp) { 153252190Srpaulo EC_GROUP_free(data->grp->group); 154252190Srpaulo EC_POINT_free(data->grp->pwe); 155252190Srpaulo BN_free(data->grp->order); 156252190Srpaulo BN_free(data->grp->prime); 157252190Srpaulo os_free(data->grp); 158252190Srpaulo } 159252190Srpaulo os_free(data); 160252190Srpaulo} 161252190Srpaulo 162252190Srpaulo 163252190Srpaulostatic u8 * eap_pwd_getkey(struct eap_sm *sm, void *priv, size_t *len) 164252190Srpaulo{ 165252190Srpaulo struct eap_pwd_data *data = priv; 166252190Srpaulo u8 *key; 167252190Srpaulo 168252190Srpaulo if (data->state != SUCCESS) 169252190Srpaulo return NULL; 170252190Srpaulo 171252190Srpaulo key = os_malloc(EAP_MSK_LEN); 172252190Srpaulo if (key == NULL) 173252190Srpaulo return NULL; 174252190Srpaulo 175252190Srpaulo os_memcpy(key, data->msk, EAP_MSK_LEN); 176252190Srpaulo *len = EAP_MSK_LEN; 177252190Srpaulo 178252190Srpaulo return key; 179252190Srpaulo} 180252190Srpaulo 181252190Srpaulo 182252190Srpaulostatic void 183252190Srpauloeap_pwd_perform_id_exchange(struct eap_sm *sm, struct eap_pwd_data *data, 184252190Srpaulo struct eap_method_ret *ret, 185252190Srpaulo const struct wpabuf *reqData, 186252190Srpaulo const u8 *payload, size_t payload_len) 187252190Srpaulo{ 188252190Srpaulo struct eap_pwd_id *id; 189252190Srpaulo 190252190Srpaulo if (data->state != PWD_ID_Req) { 191252190Srpaulo ret->ignore = TRUE; 192252190Srpaulo eap_pwd_state(data, FAILURE); 193252190Srpaulo return; 194252190Srpaulo } 195252190Srpaulo 196252190Srpaulo if (payload_len < sizeof(struct eap_pwd_id)) { 197252190Srpaulo ret->ignore = TRUE; 198252190Srpaulo eap_pwd_state(data, FAILURE); 199252190Srpaulo return; 200252190Srpaulo } 201252190Srpaulo 202252190Srpaulo id = (struct eap_pwd_id *) payload; 203252190Srpaulo data->group_num = be_to_host16(id->group_num); 204252190Srpaulo if ((id->random_function != EAP_PWD_DEFAULT_RAND_FUNC) || 205252190Srpaulo (id->prf != EAP_PWD_DEFAULT_PRF)) { 206252190Srpaulo ret->ignore = TRUE; 207252190Srpaulo eap_pwd_state(data, FAILURE); 208252190Srpaulo return; 209252190Srpaulo } 210252190Srpaulo 211252190Srpaulo wpa_printf(MSG_DEBUG, "EAP-PWD (peer): using group %d", 212252190Srpaulo data->group_num); 213252190Srpaulo 214252190Srpaulo data->id_server = os_malloc(payload_len - sizeof(struct eap_pwd_id)); 215252190Srpaulo if (data->id_server == NULL) { 216252190Srpaulo wpa_printf(MSG_INFO, "EAP-PWD: memory allocation id fail"); 217252190Srpaulo eap_pwd_state(data, FAILURE); 218252190Srpaulo return; 219252190Srpaulo } 220252190Srpaulo data->id_server_len = payload_len - sizeof(struct eap_pwd_id); 221252190Srpaulo os_memcpy(data->id_server, id->identity, data->id_server_len); 222252190Srpaulo wpa_hexdump_ascii(MSG_INFO, "EAP-PWD (peer): server sent id of", 223252190Srpaulo data->id_server, data->id_server_len); 224252190Srpaulo 225252190Srpaulo if ((data->grp = (EAP_PWD_group *) os_malloc(sizeof(EAP_PWD_group))) == 226252190Srpaulo NULL) { 227252190Srpaulo wpa_printf(MSG_INFO, "EAP-PWD: failed to allocate memory for " 228252190Srpaulo "group"); 229252190Srpaulo eap_pwd_state(data, FAILURE); 230252190Srpaulo return; 231252190Srpaulo } 232252190Srpaulo 233252190Srpaulo /* compute PWE */ 234252190Srpaulo if (compute_password_element(data->grp, data->group_num, 235252190Srpaulo data->password, data->password_len, 236252190Srpaulo data->id_server, data->id_server_len, 237252190Srpaulo data->id_peer, data->id_peer_len, 238252190Srpaulo id->token)) { 239252190Srpaulo wpa_printf(MSG_INFO, "EAP-PWD (peer): unable to compute PWE"); 240252190Srpaulo eap_pwd_state(data, FAILURE); 241252190Srpaulo return; 242252190Srpaulo } 243252190Srpaulo 244252190Srpaulo wpa_printf(MSG_DEBUG, "EAP-PWD (peer): computed %d bit PWE...", 245252190Srpaulo BN_num_bits(data->grp->prime)); 246252190Srpaulo 247252190Srpaulo data->outbuf = wpabuf_alloc(sizeof(struct eap_pwd_id) + 248252190Srpaulo data->id_peer_len); 249252190Srpaulo if (data->outbuf == NULL) { 250252190Srpaulo eap_pwd_state(data, FAILURE); 251252190Srpaulo return; 252252190Srpaulo } 253252190Srpaulo wpabuf_put_be16(data->outbuf, data->group_num); 254252190Srpaulo wpabuf_put_u8(data->outbuf, EAP_PWD_DEFAULT_RAND_FUNC); 255252190Srpaulo wpabuf_put_u8(data->outbuf, EAP_PWD_DEFAULT_PRF); 256252190Srpaulo wpabuf_put_data(data->outbuf, id->token, sizeof(id->token)); 257252190Srpaulo wpabuf_put_u8(data->outbuf, EAP_PWD_PREP_NONE); 258252190Srpaulo wpabuf_put_data(data->outbuf, data->id_peer, data->id_peer_len); 259252190Srpaulo 260252190Srpaulo eap_pwd_state(data, PWD_Commit_Req); 261252190Srpaulo} 262252190Srpaulo 263252190Srpaulo 264252190Srpaulostatic void 265252190Srpauloeap_pwd_perform_commit_exchange(struct eap_sm *sm, struct eap_pwd_data *data, 266252190Srpaulo struct eap_method_ret *ret, 267252190Srpaulo const struct wpabuf *reqData, 268252190Srpaulo const u8 *payload, size_t payload_len) 269252190Srpaulo{ 270252190Srpaulo EC_POINT *K = NULL, *point = NULL; 271252190Srpaulo BIGNUM *mask = NULL, *x = NULL, *y = NULL, *cofactor = NULL; 272252190Srpaulo u16 offset; 273252190Srpaulo u8 *ptr, *scalar = NULL, *element = NULL; 274252190Srpaulo 275252190Srpaulo if (((data->private_value = BN_new()) == NULL) || 276252190Srpaulo ((data->my_element = EC_POINT_new(data->grp->group)) == NULL) || 277252190Srpaulo ((cofactor = BN_new()) == NULL) || 278252190Srpaulo ((data->my_scalar = BN_new()) == NULL) || 279252190Srpaulo ((mask = BN_new()) == NULL)) { 280252190Srpaulo wpa_printf(MSG_INFO, "EAP-PWD (peer): scalar allocation fail"); 281252190Srpaulo goto fin; 282252190Srpaulo } 283252190Srpaulo 284252190Srpaulo if (!EC_GROUP_get_cofactor(data->grp->group, cofactor, NULL)) { 285252190Srpaulo wpa_printf(MSG_INFO, "EAP-pwd (peer): unable to get cofactor " 286252190Srpaulo "for curve"); 287252190Srpaulo goto fin; 288252190Srpaulo } 289252190Srpaulo 290252190Srpaulo BN_rand_range(data->private_value, data->grp->order); 291252190Srpaulo BN_rand_range(mask, data->grp->order); 292252190Srpaulo BN_add(data->my_scalar, data->private_value, mask); 293252190Srpaulo BN_mod(data->my_scalar, data->my_scalar, data->grp->order, 294252190Srpaulo data->bnctx); 295252190Srpaulo 296252190Srpaulo if (!EC_POINT_mul(data->grp->group, data->my_element, NULL, 297252190Srpaulo data->grp->pwe, mask, data->bnctx)) { 298252190Srpaulo wpa_printf(MSG_INFO, "EAP-PWD (peer): element allocation " 299252190Srpaulo "fail"); 300252190Srpaulo eap_pwd_state(data, FAILURE); 301252190Srpaulo goto fin; 302252190Srpaulo } 303252190Srpaulo 304252190Srpaulo if (!EC_POINT_invert(data->grp->group, data->my_element, data->bnctx)) 305252190Srpaulo { 306252190Srpaulo wpa_printf(MSG_INFO, "EAP-PWD (peer): element inversion fail"); 307252190Srpaulo goto fin; 308252190Srpaulo } 309252190Srpaulo BN_free(mask); 310252190Srpaulo 311252190Srpaulo if (((x = BN_new()) == NULL) || 312252190Srpaulo ((y = BN_new()) == NULL)) { 313252190Srpaulo wpa_printf(MSG_INFO, "EAP-PWD (peer): point allocation fail"); 314252190Srpaulo goto fin; 315252190Srpaulo } 316252190Srpaulo 317252190Srpaulo /* process the request */ 318252190Srpaulo if (((data->server_scalar = BN_new()) == NULL) || 319252190Srpaulo ((data->k = BN_new()) == NULL) || 320252190Srpaulo ((K = EC_POINT_new(data->grp->group)) == NULL) || 321252190Srpaulo ((point = EC_POINT_new(data->grp->group)) == NULL) || 322252190Srpaulo ((data->server_element = EC_POINT_new(data->grp->group)) == NULL)) 323252190Srpaulo { 324252190Srpaulo wpa_printf(MSG_INFO, "EAP-PWD (peer): peer data allocation " 325252190Srpaulo "fail"); 326252190Srpaulo goto fin; 327252190Srpaulo } 328252190Srpaulo 329252190Srpaulo /* element, x then y, followed by scalar */ 330252190Srpaulo ptr = (u8 *) payload; 331252190Srpaulo BN_bin2bn(ptr, BN_num_bytes(data->grp->prime), x); 332252190Srpaulo ptr += BN_num_bytes(data->grp->prime); 333252190Srpaulo BN_bin2bn(ptr, BN_num_bytes(data->grp->prime), y); 334252190Srpaulo ptr += BN_num_bytes(data->grp->prime); 335252190Srpaulo BN_bin2bn(ptr, BN_num_bytes(data->grp->order), data->server_scalar); 336252190Srpaulo if (!EC_POINT_set_affine_coordinates_GFp(data->grp->group, 337252190Srpaulo data->server_element, x, y, 338252190Srpaulo data->bnctx)) { 339252190Srpaulo wpa_printf(MSG_INFO, "EAP-PWD (peer): setting peer element " 340252190Srpaulo "fail"); 341252190Srpaulo goto fin; 342252190Srpaulo } 343252190Srpaulo 344252190Srpaulo /* check to ensure server's element is not in a small sub-group */ 345252190Srpaulo if (BN_cmp(cofactor, BN_value_one())) { 346252190Srpaulo if (!EC_POINT_mul(data->grp->group, point, NULL, 347252190Srpaulo data->server_element, cofactor, NULL)) { 348252190Srpaulo wpa_printf(MSG_INFO, "EAP-PWD (peer): cannot multiply " 349252190Srpaulo "server element by order!\n"); 350252190Srpaulo goto fin; 351252190Srpaulo } 352252190Srpaulo if (EC_POINT_is_at_infinity(data->grp->group, point)) { 353252190Srpaulo wpa_printf(MSG_INFO, "EAP-PWD (peer): server element " 354252190Srpaulo "is at infinity!\n"); 355252190Srpaulo goto fin; 356252190Srpaulo } 357252190Srpaulo } 358252190Srpaulo 359252190Srpaulo /* compute the shared key, k */ 360252190Srpaulo if ((!EC_POINT_mul(data->grp->group, K, NULL, data->grp->pwe, 361252190Srpaulo data->server_scalar, data->bnctx)) || 362252190Srpaulo (!EC_POINT_add(data->grp->group, K, K, data->server_element, 363252190Srpaulo data->bnctx)) || 364252190Srpaulo (!EC_POINT_mul(data->grp->group, K, NULL, K, data->private_value, 365252190Srpaulo data->bnctx))) { 366252190Srpaulo wpa_printf(MSG_INFO, "EAP-PWD (peer): computing shared key " 367252190Srpaulo "fail"); 368252190Srpaulo goto fin; 369252190Srpaulo } 370252190Srpaulo 371252190Srpaulo /* ensure that the shared key isn't in a small sub-group */ 372252190Srpaulo if (BN_cmp(cofactor, BN_value_one())) { 373252190Srpaulo if (!EC_POINT_mul(data->grp->group, K, NULL, K, cofactor, 374252190Srpaulo NULL)) { 375252190Srpaulo wpa_printf(MSG_INFO, "EAP-PWD (peer): cannot multiply " 376252190Srpaulo "shared key point by order"); 377252190Srpaulo goto fin; 378252190Srpaulo } 379252190Srpaulo } 380252190Srpaulo 381252190Srpaulo /* 382252190Srpaulo * This check is strictly speaking just for the case above where 383252190Srpaulo * co-factor > 1 but it was suggested that even though this is probably 384252190Srpaulo * never going to happen it is a simple and safe check "just to be 385252190Srpaulo * sure" so let's be safe. 386252190Srpaulo */ 387252190Srpaulo if (EC_POINT_is_at_infinity(data->grp->group, K)) { 388252190Srpaulo wpa_printf(MSG_INFO, "EAP-PWD (peer): shared key point is at " 389252190Srpaulo "infinity!\n"); 390252190Srpaulo goto fin; 391252190Srpaulo } 392252190Srpaulo 393252190Srpaulo if (!EC_POINT_get_affine_coordinates_GFp(data->grp->group, K, data->k, 394252190Srpaulo NULL, data->bnctx)) { 395252190Srpaulo wpa_printf(MSG_INFO, "EAP-PWD (peer): unable to extract " 396252190Srpaulo "shared secret from point"); 397252190Srpaulo goto fin; 398252190Srpaulo } 399252190Srpaulo 400252190Srpaulo /* now do the response */ 401252190Srpaulo if (!EC_POINT_get_affine_coordinates_GFp(data->grp->group, 402252190Srpaulo data->my_element, x, y, 403252190Srpaulo data->bnctx)) { 404252190Srpaulo wpa_printf(MSG_INFO, "EAP-PWD (peer): point assignment fail"); 405252190Srpaulo goto fin; 406252190Srpaulo } 407252190Srpaulo 408252190Srpaulo if (((scalar = os_malloc(BN_num_bytes(data->grp->order))) == NULL) || 409252190Srpaulo ((element = os_malloc(BN_num_bytes(data->grp->prime) * 2)) == 410252190Srpaulo NULL)) { 411252190Srpaulo wpa_printf(MSG_INFO, "EAP-PWD (peer): data allocation fail"); 412252190Srpaulo goto fin; 413252190Srpaulo } 414252190Srpaulo 415252190Srpaulo /* 416252190Srpaulo * bignums occupy as little memory as possible so one that is 417252190Srpaulo * sufficiently smaller than the prime or order might need pre-pending 418252190Srpaulo * with zeros. 419252190Srpaulo */ 420252190Srpaulo os_memset(scalar, 0, BN_num_bytes(data->grp->order)); 421252190Srpaulo os_memset(element, 0, BN_num_bytes(data->grp->prime) * 2); 422252190Srpaulo offset = BN_num_bytes(data->grp->order) - 423252190Srpaulo BN_num_bytes(data->my_scalar); 424252190Srpaulo BN_bn2bin(data->my_scalar, scalar + offset); 425252190Srpaulo 426252190Srpaulo offset = BN_num_bytes(data->grp->prime) - BN_num_bytes(x); 427252190Srpaulo BN_bn2bin(x, element + offset); 428252190Srpaulo offset = BN_num_bytes(data->grp->prime) - BN_num_bytes(y); 429252190Srpaulo BN_bn2bin(y, element + BN_num_bytes(data->grp->prime) + offset); 430252190Srpaulo 431252190Srpaulo data->outbuf = wpabuf_alloc(BN_num_bytes(data->grp->order) + 432252190Srpaulo 2 * BN_num_bytes(data->grp->prime)); 433252190Srpaulo if (data->outbuf == NULL) 434252190Srpaulo goto fin; 435252190Srpaulo 436252190Srpaulo /* we send the element as (x,y) follwed by the scalar */ 437252190Srpaulo wpabuf_put_data(data->outbuf, element, 438252190Srpaulo 2 * BN_num_bytes(data->grp->prime)); 439252190Srpaulo wpabuf_put_data(data->outbuf, scalar, BN_num_bytes(data->grp->order)); 440252190Srpaulo 441252190Srpaulofin: 442252190Srpaulo os_free(scalar); 443252190Srpaulo os_free(element); 444252190Srpaulo BN_free(x); 445252190Srpaulo BN_free(y); 446252190Srpaulo BN_free(cofactor); 447252190Srpaulo EC_POINT_free(K); 448252190Srpaulo EC_POINT_free(point); 449252190Srpaulo if (data->outbuf == NULL) 450252190Srpaulo eap_pwd_state(data, FAILURE); 451252190Srpaulo else 452252190Srpaulo eap_pwd_state(data, PWD_Confirm_Req); 453252190Srpaulo} 454252190Srpaulo 455252190Srpaulo 456252190Srpaulostatic void 457252190Srpauloeap_pwd_perform_confirm_exchange(struct eap_sm *sm, struct eap_pwd_data *data, 458252190Srpaulo struct eap_method_ret *ret, 459252190Srpaulo const struct wpabuf *reqData, 460252190Srpaulo const u8 *payload, size_t payload_len) 461252190Srpaulo{ 462252190Srpaulo BIGNUM *x = NULL, *y = NULL; 463252190Srpaulo struct crypto_hash *hash; 464252190Srpaulo u32 cs; 465252190Srpaulo u16 grp; 466252190Srpaulo u8 conf[SHA256_MAC_LEN], *cruft = NULL, *ptr; 467252190Srpaulo int offset; 468252190Srpaulo 469252190Srpaulo /* 470252190Srpaulo * first build up the ciphersuite which is group | random_function | 471252190Srpaulo * prf 472252190Srpaulo */ 473252190Srpaulo grp = htons(data->group_num); 474252190Srpaulo ptr = (u8 *) &cs; 475252190Srpaulo os_memcpy(ptr, &grp, sizeof(u16)); 476252190Srpaulo ptr += sizeof(u16); 477252190Srpaulo *ptr = EAP_PWD_DEFAULT_RAND_FUNC; 478252190Srpaulo ptr += sizeof(u8); 479252190Srpaulo *ptr = EAP_PWD_DEFAULT_PRF; 480252190Srpaulo 481252190Srpaulo /* each component of the cruft will be at most as big as the prime */ 482252190Srpaulo if (((cruft = os_malloc(BN_num_bytes(data->grp->prime))) == NULL) || 483252190Srpaulo ((x = BN_new()) == NULL) || ((y = BN_new()) == NULL)) { 484252190Srpaulo wpa_printf(MSG_INFO, "EAP-PWD (server): confirm allocation " 485252190Srpaulo "fail"); 486252190Srpaulo goto fin; 487252190Srpaulo } 488252190Srpaulo 489252190Srpaulo /* 490252190Srpaulo * server's commit is H(k | server_element | server_scalar | 491252190Srpaulo * peer_element | peer_scalar | ciphersuite) 492252190Srpaulo */ 493252190Srpaulo hash = eap_pwd_h_init(); 494252190Srpaulo if (hash == NULL) 495252190Srpaulo goto fin; 496252190Srpaulo 497252190Srpaulo /* 498252190Srpaulo * zero the memory each time because this is mod prime math and some 499252190Srpaulo * value may start with a few zeros and the previous one did not. 500252190Srpaulo */ 501252190Srpaulo os_memset(cruft, 0, BN_num_bytes(data->grp->prime)); 502252190Srpaulo offset = BN_num_bytes(data->grp->prime) - BN_num_bytes(data->k); 503252190Srpaulo BN_bn2bin(data->k, cruft + offset); 504252190Srpaulo eap_pwd_h_update(hash, cruft, BN_num_bytes(data->grp->prime)); 505252190Srpaulo 506252190Srpaulo /* server element: x, y */ 507252190Srpaulo if (!EC_POINT_get_affine_coordinates_GFp(data->grp->group, 508252190Srpaulo data->server_element, x, y, 509252190Srpaulo data->bnctx)) { 510252190Srpaulo wpa_printf(MSG_INFO, "EAP-PWD (server): confirm point " 511252190Srpaulo "assignment fail"); 512252190Srpaulo goto fin; 513252190Srpaulo } 514252190Srpaulo os_memset(cruft, 0, BN_num_bytes(data->grp->prime)); 515252190Srpaulo offset = BN_num_bytes(data->grp->prime) - BN_num_bytes(x); 516252190Srpaulo BN_bn2bin(x, cruft + offset); 517252190Srpaulo eap_pwd_h_update(hash, cruft, BN_num_bytes(data->grp->prime)); 518252190Srpaulo os_memset(cruft, 0, BN_num_bytes(data->grp->prime)); 519252190Srpaulo offset = BN_num_bytes(data->grp->prime) - BN_num_bytes(y); 520252190Srpaulo BN_bn2bin(y, cruft + offset); 521252190Srpaulo eap_pwd_h_update(hash, cruft, BN_num_bytes(data->grp->prime)); 522252190Srpaulo 523252190Srpaulo /* server scalar */ 524252190Srpaulo os_memset(cruft, 0, BN_num_bytes(data->grp->prime)); 525252190Srpaulo offset = BN_num_bytes(data->grp->order) - 526252190Srpaulo BN_num_bytes(data->server_scalar); 527252190Srpaulo BN_bn2bin(data->server_scalar, cruft + offset); 528252190Srpaulo eap_pwd_h_update(hash, cruft, BN_num_bytes(data->grp->order)); 529252190Srpaulo 530252190Srpaulo /* my element: x, y */ 531252190Srpaulo if (!EC_POINT_get_affine_coordinates_GFp(data->grp->group, 532252190Srpaulo data->my_element, x, y, 533252190Srpaulo data->bnctx)) { 534252190Srpaulo wpa_printf(MSG_INFO, "EAP-PWD (server): confirm point " 535252190Srpaulo "assignment fail"); 536252190Srpaulo goto fin; 537252190Srpaulo } 538252190Srpaulo 539252190Srpaulo os_memset(cruft, 0, BN_num_bytes(data->grp->prime)); 540252190Srpaulo offset = BN_num_bytes(data->grp->prime) - BN_num_bytes(x); 541252190Srpaulo BN_bn2bin(x, cruft + offset); 542252190Srpaulo eap_pwd_h_update(hash, cruft, BN_num_bytes(data->grp->prime)); 543252190Srpaulo os_memset(cruft, 0, BN_num_bytes(data->grp->prime)); 544252190Srpaulo offset = BN_num_bytes(data->grp->prime) - BN_num_bytes(y); 545252190Srpaulo BN_bn2bin(y, cruft + offset); 546252190Srpaulo eap_pwd_h_update(hash, cruft, BN_num_bytes(data->grp->prime)); 547252190Srpaulo 548252190Srpaulo /* my scalar */ 549252190Srpaulo os_memset(cruft, 0, BN_num_bytes(data->grp->prime)); 550252190Srpaulo offset = BN_num_bytes(data->grp->order) - 551252190Srpaulo BN_num_bytes(data->my_scalar); 552252190Srpaulo BN_bn2bin(data->my_scalar, cruft + offset); 553252190Srpaulo eap_pwd_h_update(hash, cruft, BN_num_bytes(data->grp->order)); 554252190Srpaulo 555252190Srpaulo /* the ciphersuite */ 556252190Srpaulo eap_pwd_h_update(hash, (u8 *) &cs, sizeof(u32)); 557252190Srpaulo 558252190Srpaulo /* random function fin */ 559252190Srpaulo eap_pwd_h_final(hash, conf); 560252190Srpaulo 561252190Srpaulo ptr = (u8 *) payload; 562252190Srpaulo if (os_memcmp(conf, ptr, SHA256_MAC_LEN)) { 563252190Srpaulo wpa_printf(MSG_INFO, "EAP-PWD (peer): confirm did not verify"); 564252190Srpaulo goto fin; 565252190Srpaulo } 566252190Srpaulo 567252190Srpaulo wpa_printf(MSG_DEBUG, "EAP-pwd (peer): confirm verified"); 568252190Srpaulo 569252190Srpaulo /* 570252190Srpaulo * compute confirm: 571252190Srpaulo * H(k | peer_element | peer_scalar | server_element | server_scalar | 572252190Srpaulo * ciphersuite) 573252190Srpaulo */ 574252190Srpaulo hash = eap_pwd_h_init(); 575252190Srpaulo if (hash == NULL) 576252190Srpaulo goto fin; 577252190Srpaulo 578252190Srpaulo /* k */ 579252190Srpaulo os_memset(cruft, 0, BN_num_bytes(data->grp->prime)); 580252190Srpaulo offset = BN_num_bytes(data->grp->prime) - BN_num_bytes(data->k); 581252190Srpaulo BN_bn2bin(data->k, cruft + offset); 582252190Srpaulo eap_pwd_h_update(hash, cruft, BN_num_bytes(data->grp->prime)); 583252190Srpaulo 584252190Srpaulo /* my element */ 585252190Srpaulo if (!EC_POINT_get_affine_coordinates_GFp(data->grp->group, 586252190Srpaulo data->my_element, x, y, 587252190Srpaulo data->bnctx)) { 588252190Srpaulo wpa_printf(MSG_INFO, "EAP-PWD (peer): confirm point " 589252190Srpaulo "assignment fail"); 590252190Srpaulo goto fin; 591252190Srpaulo } 592252190Srpaulo os_memset(cruft, 0, BN_num_bytes(data->grp->prime)); 593252190Srpaulo offset = BN_num_bytes(data->grp->prime) - BN_num_bytes(x); 594252190Srpaulo BN_bn2bin(x, cruft + offset); 595252190Srpaulo eap_pwd_h_update(hash, cruft, BN_num_bytes(data->grp->prime)); 596252190Srpaulo os_memset(cruft, 0, BN_num_bytes(data->grp->prime)); 597252190Srpaulo offset = BN_num_bytes(data->grp->prime) - BN_num_bytes(y); 598252190Srpaulo BN_bn2bin(y, cruft + offset); 599252190Srpaulo eap_pwd_h_update(hash, cruft, BN_num_bytes(data->grp->prime)); 600252190Srpaulo 601252190Srpaulo /* my scalar */ 602252190Srpaulo os_memset(cruft, 0, BN_num_bytes(data->grp->prime)); 603252190Srpaulo offset = BN_num_bytes(data->grp->order) - 604252190Srpaulo BN_num_bytes(data->my_scalar); 605252190Srpaulo BN_bn2bin(data->my_scalar, cruft + offset); 606252190Srpaulo eap_pwd_h_update(hash, cruft, BN_num_bytes(data->grp->order)); 607252190Srpaulo 608252190Srpaulo /* server element: x, y */ 609252190Srpaulo if (!EC_POINT_get_affine_coordinates_GFp(data->grp->group, 610252190Srpaulo data->server_element, x, y, 611252190Srpaulo data->bnctx)) { 612252190Srpaulo wpa_printf(MSG_INFO, "EAP-PWD (peer): confirm point " 613252190Srpaulo "assignment fail"); 614252190Srpaulo goto fin; 615252190Srpaulo } 616252190Srpaulo os_memset(cruft, 0, BN_num_bytes(data->grp->prime)); 617252190Srpaulo offset = BN_num_bytes(data->grp->prime) - BN_num_bytes(x); 618252190Srpaulo BN_bn2bin(x, cruft + offset); 619252190Srpaulo eap_pwd_h_update(hash, cruft, BN_num_bytes(data->grp->prime)); 620252190Srpaulo os_memset(cruft, 0, BN_num_bytes(data->grp->prime)); 621252190Srpaulo offset = BN_num_bytes(data->grp->prime) - BN_num_bytes(y); 622252190Srpaulo BN_bn2bin(y, cruft + offset); 623252190Srpaulo eap_pwd_h_update(hash, cruft, BN_num_bytes(data->grp->prime)); 624252190Srpaulo 625252190Srpaulo /* server scalar */ 626252190Srpaulo os_memset(cruft, 0, BN_num_bytes(data->grp->prime)); 627252190Srpaulo offset = BN_num_bytes(data->grp->order) - 628252190Srpaulo BN_num_bytes(data->server_scalar); 629252190Srpaulo BN_bn2bin(data->server_scalar, cruft + offset); 630252190Srpaulo eap_pwd_h_update(hash, cruft, BN_num_bytes(data->grp->order)); 631252190Srpaulo 632252190Srpaulo /* the ciphersuite */ 633252190Srpaulo eap_pwd_h_update(hash, (u8 *) &cs, sizeof(u32)); 634252190Srpaulo 635252190Srpaulo /* all done */ 636252190Srpaulo eap_pwd_h_final(hash, conf); 637252190Srpaulo 638252190Srpaulo if (compute_keys(data->grp, data->bnctx, data->k, 639252190Srpaulo data->my_scalar, data->server_scalar, conf, ptr, 640252190Srpaulo &cs, data->msk, data->emsk) < 0) { 641252190Srpaulo wpa_printf(MSG_INFO, "EAP-PWD (peer): unable to compute MSK | " 642252190Srpaulo "EMSK"); 643252190Srpaulo goto fin; 644252190Srpaulo } 645252190Srpaulo 646252190Srpaulo data->outbuf = wpabuf_alloc(SHA256_MAC_LEN); 647252190Srpaulo if (data->outbuf == NULL) 648252190Srpaulo goto fin; 649252190Srpaulo 650252190Srpaulo wpabuf_put_data(data->outbuf, conf, SHA256_MAC_LEN); 651252190Srpaulo 652252190Srpaulofin: 653252190Srpaulo os_free(cruft); 654252190Srpaulo BN_free(x); 655252190Srpaulo BN_free(y); 656252190Srpaulo ret->methodState = METHOD_DONE; 657252190Srpaulo if (data->outbuf == NULL) { 658252190Srpaulo ret->decision = DECISION_FAIL; 659252190Srpaulo eap_pwd_state(data, FAILURE); 660252190Srpaulo } else { 661252190Srpaulo ret->decision = DECISION_UNCOND_SUCC; 662252190Srpaulo eap_pwd_state(data, SUCCESS); 663252190Srpaulo } 664252190Srpaulo} 665252190Srpaulo 666252190Srpaulo 667252190Srpaulostatic struct wpabuf * 668252190Srpauloeap_pwd_process(struct eap_sm *sm, void *priv, struct eap_method_ret *ret, 669252190Srpaulo const struct wpabuf *reqData) 670252190Srpaulo{ 671252190Srpaulo struct eap_pwd_data *data = priv; 672252190Srpaulo struct wpabuf *resp = NULL; 673252190Srpaulo const u8 *pos, *buf; 674252190Srpaulo size_t len; 675252190Srpaulo u16 tot_len = 0; 676252190Srpaulo u8 lm_exch; 677252190Srpaulo 678252190Srpaulo pos = eap_hdr_validate(EAP_VENDOR_IETF, EAP_TYPE_PWD, reqData, &len); 679252190Srpaulo if ((pos == NULL) || (len < 1)) { 680252190Srpaulo wpa_printf(MSG_DEBUG, "EAP-pwd: Got a frame but pos is %s and " 681252190Srpaulo "len is %d", 682252190Srpaulo pos == NULL ? "NULL" : "not NULL", (int) len); 683252190Srpaulo ret->ignore = TRUE; 684252190Srpaulo return NULL; 685252190Srpaulo } 686252190Srpaulo 687252190Srpaulo ret->ignore = FALSE; 688252190Srpaulo ret->methodState = METHOD_MAY_CONT; 689252190Srpaulo ret->decision = DECISION_FAIL; 690252190Srpaulo ret->allowNotifications = FALSE; 691252190Srpaulo 692252190Srpaulo lm_exch = *pos; 693252190Srpaulo pos++; /* skip over the bits and the exch */ 694252190Srpaulo len--; 695252190Srpaulo 696252190Srpaulo /* 697252190Srpaulo * we're fragmenting so send out the next fragment 698252190Srpaulo */ 699252190Srpaulo if (data->out_frag_pos) { 700252190Srpaulo /* 701252190Srpaulo * this should be an ACK 702252190Srpaulo */ 703252190Srpaulo if (len) 704252190Srpaulo wpa_printf(MSG_INFO, "Bad Response! Fragmenting but " 705252190Srpaulo "not an ACK"); 706252190Srpaulo 707252190Srpaulo wpa_printf(MSG_DEBUG, "EAP-pwd: Got an ACK for a fragment"); 708252190Srpaulo /* 709252190Srpaulo * check if there are going to be more fragments 710252190Srpaulo */ 711252190Srpaulo len = wpabuf_len(data->outbuf) - data->out_frag_pos; 712252190Srpaulo if ((len + EAP_PWD_HDR_SIZE) > data->mtu) { 713252190Srpaulo len = data->mtu - EAP_PWD_HDR_SIZE; 714252190Srpaulo EAP_PWD_SET_MORE_BIT(lm_exch); 715252190Srpaulo } 716252190Srpaulo resp = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_PWD, 717252190Srpaulo EAP_PWD_HDR_SIZE + len, 718252190Srpaulo EAP_CODE_RESPONSE, eap_get_id(reqData)); 719252190Srpaulo if (resp == NULL) { 720252190Srpaulo wpa_printf(MSG_INFO, "Unable to allocate memory for " 721252190Srpaulo "next fragment!"); 722252190Srpaulo return NULL; 723252190Srpaulo } 724252190Srpaulo wpabuf_put_u8(resp, lm_exch); 725252190Srpaulo buf = wpabuf_head_u8(data->outbuf); 726252190Srpaulo wpabuf_put_data(resp, buf + data->out_frag_pos, len); 727252190Srpaulo data->out_frag_pos += len; 728252190Srpaulo /* 729252190Srpaulo * this is the last fragment so get rid of the out buffer 730252190Srpaulo */ 731252190Srpaulo if (data->out_frag_pos >= wpabuf_len(data->outbuf)) { 732252190Srpaulo wpabuf_free(data->outbuf); 733252190Srpaulo data->outbuf = NULL; 734252190Srpaulo data->out_frag_pos = 0; 735252190Srpaulo } 736252190Srpaulo wpa_printf(MSG_DEBUG, "EAP-pwd: Send %s fragment of %d bytes", 737252190Srpaulo data->out_frag_pos == 0 ? "last" : "next", 738252190Srpaulo (int) len); 739252190Srpaulo return resp; 740252190Srpaulo } 741252190Srpaulo 742252190Srpaulo /* 743252190Srpaulo * see if this is a fragment that needs buffering 744252190Srpaulo * 745252190Srpaulo * if it's the first fragment there'll be a length field 746252190Srpaulo */ 747252190Srpaulo if (EAP_PWD_GET_LENGTH_BIT(lm_exch)) { 748252190Srpaulo tot_len = WPA_GET_BE16(pos); 749252190Srpaulo wpa_printf(MSG_DEBUG, "EAP-pwd: Incoming fragments whose " 750252190Srpaulo "total length = %d", tot_len); 751252190Srpaulo data->inbuf = wpabuf_alloc(tot_len); 752252190Srpaulo if (data->inbuf == NULL) { 753252190Srpaulo wpa_printf(MSG_INFO, "Out of memory to buffer " 754252190Srpaulo "fragments!"); 755252190Srpaulo return NULL; 756252190Srpaulo } 757252190Srpaulo pos += sizeof(u16); 758252190Srpaulo len -= sizeof(u16); 759252190Srpaulo } 760252190Srpaulo /* 761252190Srpaulo * buffer and ACK the fragment 762252190Srpaulo */ 763252190Srpaulo if (EAP_PWD_GET_MORE_BIT(lm_exch)) { 764252190Srpaulo data->in_frag_pos += len; 765252190Srpaulo if (data->in_frag_pos > wpabuf_size(data->inbuf)) { 766252190Srpaulo wpa_printf(MSG_INFO, "EAP-pwd: Buffer overflow attack " 767252190Srpaulo "detected (%d vs. %d)!", 768252190Srpaulo (int) data->in_frag_pos, 769252190Srpaulo (int) wpabuf_len(data->inbuf)); 770252190Srpaulo wpabuf_free(data->inbuf); 771252190Srpaulo data->in_frag_pos = 0; 772252190Srpaulo return NULL; 773252190Srpaulo } 774252190Srpaulo wpabuf_put_data(data->inbuf, pos, len); 775252190Srpaulo 776252190Srpaulo resp = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_PWD, 777252190Srpaulo EAP_PWD_HDR_SIZE, 778252190Srpaulo EAP_CODE_RESPONSE, eap_get_id(reqData)); 779252190Srpaulo if (resp != NULL) 780252190Srpaulo wpabuf_put_u8(resp, (EAP_PWD_GET_EXCHANGE(lm_exch))); 781252190Srpaulo wpa_printf(MSG_DEBUG, "EAP-pwd: ACKing a %d byte fragment", 782252190Srpaulo (int) len); 783252190Srpaulo return resp; 784252190Srpaulo } 785252190Srpaulo /* 786252190Srpaulo * we're buffering and this is the last fragment 787252190Srpaulo */ 788252190Srpaulo if (data->in_frag_pos) { 789252190Srpaulo wpabuf_put_data(data->inbuf, pos, len); 790252190Srpaulo wpa_printf(MSG_DEBUG, "EAP-pwd: Last fragment, %d bytes", 791252190Srpaulo (int) len); 792252190Srpaulo data->in_frag_pos += len; 793252190Srpaulo pos = wpabuf_head_u8(data->inbuf); 794252190Srpaulo len = data->in_frag_pos; 795252190Srpaulo } 796252190Srpaulo wpa_printf(MSG_DEBUG, "EAP-pwd: processing frame: exch %d, len %d", 797252190Srpaulo EAP_PWD_GET_EXCHANGE(lm_exch), (int) len); 798252190Srpaulo 799252190Srpaulo switch (EAP_PWD_GET_EXCHANGE(lm_exch)) { 800252190Srpaulo case EAP_PWD_OPCODE_ID_EXCH: 801252190Srpaulo eap_pwd_perform_id_exchange(sm, data, ret, reqData, 802252190Srpaulo pos, len); 803252190Srpaulo break; 804252190Srpaulo case EAP_PWD_OPCODE_COMMIT_EXCH: 805252190Srpaulo eap_pwd_perform_commit_exchange(sm, data, ret, reqData, 806252190Srpaulo pos, len); 807252190Srpaulo break; 808252190Srpaulo case EAP_PWD_OPCODE_CONFIRM_EXCH: 809252190Srpaulo eap_pwd_perform_confirm_exchange(sm, data, ret, reqData, 810252190Srpaulo pos, len); 811252190Srpaulo break; 812252190Srpaulo default: 813252190Srpaulo wpa_printf(MSG_INFO, "EAP-pwd: Ignoring message with unknown " 814252190Srpaulo "opcode %d", lm_exch); 815252190Srpaulo break; 816252190Srpaulo } 817252190Srpaulo /* 818252190Srpaulo * if we buffered the just processed input now's the time to free it 819252190Srpaulo */ 820252190Srpaulo if (data->in_frag_pos) { 821252190Srpaulo wpabuf_free(data->inbuf); 822252190Srpaulo data->in_frag_pos = 0; 823252190Srpaulo } 824252190Srpaulo 825252190Srpaulo if (data->outbuf == NULL) 826252190Srpaulo return NULL; /* generic failure */ 827252190Srpaulo 828252190Srpaulo /* 829252190Srpaulo * we have output! Do we need to fragment it? 830252190Srpaulo */ 831252190Srpaulo len = wpabuf_len(data->outbuf); 832252190Srpaulo if ((len + EAP_PWD_HDR_SIZE) > data->mtu) { 833252190Srpaulo resp = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_PWD, data->mtu, 834252190Srpaulo EAP_CODE_RESPONSE, eap_get_id(reqData)); 835252190Srpaulo /* 836252190Srpaulo * if so it's the first so include a length field 837252190Srpaulo */ 838252190Srpaulo EAP_PWD_SET_LENGTH_BIT(lm_exch); 839252190Srpaulo EAP_PWD_SET_MORE_BIT(lm_exch); 840252190Srpaulo tot_len = len; 841252190Srpaulo /* 842252190Srpaulo * keep the packet at the MTU 843252190Srpaulo */ 844252190Srpaulo len = data->mtu - EAP_PWD_HDR_SIZE - sizeof(u16); 845252190Srpaulo wpa_printf(MSG_DEBUG, "EAP-pwd: Fragmenting output, total " 846252190Srpaulo "length = %d", tot_len); 847252190Srpaulo } else { 848252190Srpaulo resp = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_PWD, 849252190Srpaulo EAP_PWD_HDR_SIZE + len, 850252190Srpaulo EAP_CODE_RESPONSE, eap_get_id(reqData)); 851252190Srpaulo } 852252190Srpaulo if (resp == NULL) 853252190Srpaulo return NULL; 854252190Srpaulo 855252190Srpaulo wpabuf_put_u8(resp, lm_exch); 856252190Srpaulo if (EAP_PWD_GET_LENGTH_BIT(lm_exch)) { 857252190Srpaulo wpabuf_put_be16(resp, tot_len); 858252190Srpaulo data->out_frag_pos += len; 859252190Srpaulo } 860252190Srpaulo buf = wpabuf_head_u8(data->outbuf); 861252190Srpaulo wpabuf_put_data(resp, buf, len); 862252190Srpaulo /* 863252190Srpaulo * if we're not fragmenting then there's no need to carry this around 864252190Srpaulo */ 865252190Srpaulo if (data->out_frag_pos == 0) { 866252190Srpaulo wpabuf_free(data->outbuf); 867252190Srpaulo data->outbuf = NULL; 868252190Srpaulo data->out_frag_pos = 0; 869252190Srpaulo } 870252190Srpaulo 871252190Srpaulo return resp; 872252190Srpaulo} 873252190Srpaulo 874252190Srpaulo 875252190Srpaulostatic Boolean eap_pwd_key_available(struct eap_sm *sm, void *priv) 876252190Srpaulo{ 877252190Srpaulo struct eap_pwd_data *data = priv; 878252190Srpaulo return data->state == SUCCESS; 879252190Srpaulo} 880252190Srpaulo 881252190Srpaulo 882252190Srpaulostatic u8 * eap_pwd_get_emsk(struct eap_sm *sm, void *priv, size_t *len) 883252190Srpaulo{ 884252190Srpaulo struct eap_pwd_data *data = priv; 885252190Srpaulo u8 *key; 886252190Srpaulo 887252190Srpaulo if (data->state != SUCCESS) 888252190Srpaulo return NULL; 889252190Srpaulo 890252190Srpaulo if ((key = os_malloc(EAP_EMSK_LEN)) == NULL) 891252190Srpaulo return NULL; 892252190Srpaulo 893252190Srpaulo os_memcpy(key, data->emsk, EAP_EMSK_LEN); 894252190Srpaulo *len = EAP_EMSK_LEN; 895252190Srpaulo 896252190Srpaulo return key; 897252190Srpaulo} 898252190Srpaulo 899252190Srpaulo 900252190Srpauloint eap_peer_pwd_register(void) 901252190Srpaulo{ 902252190Srpaulo struct eap_method *eap; 903252190Srpaulo int ret; 904252190Srpaulo 905252190Srpaulo EVP_add_digest(EVP_sha256()); 906252190Srpaulo eap = eap_peer_method_alloc(EAP_PEER_METHOD_INTERFACE_VERSION, 907252190Srpaulo EAP_VENDOR_IETF, EAP_TYPE_PWD, "PWD"); 908252190Srpaulo if (eap == NULL) 909252190Srpaulo return -1; 910252190Srpaulo 911252190Srpaulo eap->init = eap_pwd_init; 912252190Srpaulo eap->deinit = eap_pwd_deinit; 913252190Srpaulo eap->process = eap_pwd_process; 914252190Srpaulo eap->isKeyAvailable = eap_pwd_key_available; 915252190Srpaulo eap->getKey = eap_pwd_getkey; 916252190Srpaulo eap->get_emsk = eap_pwd_get_emsk; 917252190Srpaulo 918252190Srpaulo ret = eap_peer_method_register(eap); 919252190Srpaulo if (ret) 920252190Srpaulo eap_peer_method_free(eap); 921252190Srpaulo return ret; 922252190Srpaulo} 923