X-Git-Url: http://www.project-moonshot.org/gitweb/?a=blobdiff_plain;f=libeap%2Fsrc%2Feap_peer%2Feap_pwd.c;fp=libeap%2Fsrc%2Feap_peer%2Feap_pwd.c;h=0000000000000000000000000000000000000000;hb=852a32fe63bc7d0271cca4df1bdb7634fd494b53;hp=d2bc981cd06b887fddda0c10f0c60998346cd608;hpb=88e34eecb5769da6526361b35df00fdbe823eac5;p=mech_eap.git diff --git a/libeap/src/eap_peer/eap_pwd.c b/libeap/src/eap_peer/eap_pwd.c deleted file mode 100644 index d2bc981..0000000 --- a/libeap/src/eap_peer/eap_pwd.c +++ /dev/null @@ -1,1072 +0,0 @@ -/* - * EAP peer method: EAP-pwd (RFC 5931) - * Copyright (c) 2010, Dan Harkins - * - * This software may be distributed under the terms of the BSD license. - * See README for more details. - */ - -#include "includes.h" - -#include "common.h" -#include "crypto/sha256.h" -#include "crypto/ms_funcs.h" -#include "eap_peer/eap_i.h" -#include "eap_common/eap_pwd_common.h" - - -struct eap_pwd_data { - enum { - PWD_ID_Req, PWD_Commit_Req, PWD_Confirm_Req, - SUCCESS_ON_FRAG_COMPLETION, SUCCESS, FAILURE - } state; - u8 *id_peer; - size_t id_peer_len; - u8 *id_server; - size_t id_server_len; - u8 *password; - size_t password_len; - int password_hash; - u16 group_num; - EAP_PWD_group *grp; - - struct wpabuf *inbuf; - size_t in_frag_pos; - struct wpabuf *outbuf; - size_t out_frag_pos; - size_t mtu; - - BIGNUM *k; - BIGNUM *private_value; - BIGNUM *server_scalar; - BIGNUM *my_scalar; - EC_POINT *my_element; - EC_POINT *server_element; - - u8 msk[EAP_MSK_LEN]; - u8 emsk[EAP_EMSK_LEN]; - u8 session_id[1 + SHA256_MAC_LEN]; - - BN_CTX *bnctx; -}; - - -#ifndef CONFIG_NO_STDOUT_DEBUG -static const char * eap_pwd_state_txt(int state) -{ - switch (state) { - case PWD_ID_Req: - return "PWD-ID-Req"; - case PWD_Commit_Req: - return "PWD-Commit-Req"; - case PWD_Confirm_Req: - return "PWD-Confirm-Req"; - case SUCCESS_ON_FRAG_COMPLETION: - return "SUCCESS_ON_FRAG_COMPLETION"; - case SUCCESS: - return "SUCCESS"; - case FAILURE: - return "FAILURE"; - default: - return "PWD-UNK"; - } -} -#endif /* CONFIG_NO_STDOUT_DEBUG */ - - -static void eap_pwd_state(struct eap_pwd_data *data, int state) -{ - wpa_printf(MSG_DEBUG, "EAP-PWD: %s -> %s", - eap_pwd_state_txt(data->state), eap_pwd_state_txt(state)); - data->state = state; -} - - -static void * eap_pwd_init(struct eap_sm *sm) -{ - struct eap_pwd_data *data; - const u8 *identity, *password; - size_t identity_len, password_len; - int fragment_size; - int pwhash; - - password = eap_get_config_password2(sm, &password_len, &pwhash); - if (password == NULL) { - wpa_printf(MSG_INFO, "EAP-PWD: No password configured!"); - return NULL; - } - - identity = eap_get_config_identity(sm, &identity_len); - if (identity == NULL) { - wpa_printf(MSG_INFO, "EAP-PWD: No identity configured!"); - return NULL; - } - - if ((data = os_zalloc(sizeof(*data))) == NULL) { - wpa_printf(MSG_INFO, "EAP-PWD: memory allocation data fail"); - return NULL; - } - - if ((data->bnctx = BN_CTX_new()) == NULL) { - wpa_printf(MSG_INFO, "EAP-PWD: bn context allocation fail"); - os_free(data); - return NULL; - } - - if ((data->id_peer = os_malloc(identity_len)) == NULL) { - wpa_printf(MSG_INFO, "EAP-PWD: memory allocation id fail"); - BN_CTX_free(data->bnctx); - os_free(data); - return NULL; - } - - os_memcpy(data->id_peer, identity, identity_len); - data->id_peer_len = identity_len; - - if ((data->password = os_malloc(password_len)) == NULL) { - wpa_printf(MSG_INFO, "EAP-PWD: memory allocation psk fail"); - BN_CTX_free(data->bnctx); - bin_clear_free(data->id_peer, data->id_peer_len); - os_free(data); - return NULL; - } - os_memcpy(data->password, password, password_len); - data->password_len = password_len; - data->password_hash = pwhash; - - data->out_frag_pos = data->in_frag_pos = 0; - data->inbuf = data->outbuf = NULL; - fragment_size = eap_get_config_fragment_size(sm); - if (fragment_size <= 0) - data->mtu = 1020; /* default from RFC 5931 */ - else - data->mtu = fragment_size; - - data->state = PWD_ID_Req; - - return data; -} - - -static void eap_pwd_deinit(struct eap_sm *sm, void *priv) -{ - struct eap_pwd_data *data = priv; - - BN_clear_free(data->private_value); - BN_clear_free(data->server_scalar); - BN_clear_free(data->my_scalar); - BN_clear_free(data->k); - BN_CTX_free(data->bnctx); - EC_POINT_clear_free(data->my_element); - EC_POINT_clear_free(data->server_element); - bin_clear_free(data->id_peer, data->id_peer_len); - bin_clear_free(data->id_server, data->id_server_len); - bin_clear_free(data->password, data->password_len); - if (data->grp) { - EC_GROUP_free(data->grp->group); - EC_POINT_clear_free(data->grp->pwe); - BN_clear_free(data->grp->order); - BN_clear_free(data->grp->prime); - os_free(data->grp); - } - wpabuf_free(data->inbuf); - wpabuf_free(data->outbuf); - bin_clear_free(data, sizeof(*data)); -} - - -static u8 * eap_pwd_getkey(struct eap_sm *sm, void *priv, size_t *len) -{ - struct eap_pwd_data *data = priv; - u8 *key; - - if (data->state != SUCCESS) - return NULL; - - key = os_malloc(EAP_MSK_LEN); - if (key == NULL) - return NULL; - - os_memcpy(key, data->msk, EAP_MSK_LEN); - *len = EAP_MSK_LEN; - - return key; -} - - -static u8 * eap_pwd_get_session_id(struct eap_sm *sm, void *priv, size_t *len) -{ - struct eap_pwd_data *data = priv; - u8 *id; - - if (data->state != SUCCESS) - return NULL; - - id = os_malloc(1 + SHA256_MAC_LEN); - if (id == NULL) - return NULL; - - os_memcpy(id, data->session_id, 1 + SHA256_MAC_LEN); - *len = 1 + SHA256_MAC_LEN; - - return id; -} - - -static void -eap_pwd_perform_id_exchange(struct eap_sm *sm, struct eap_pwd_data *data, - struct eap_method_ret *ret, - const struct wpabuf *reqData, - const u8 *payload, size_t payload_len) -{ - struct eap_pwd_id *id; - const u8 *password; - size_t password_len; - u8 pwhashhash[16]; - int res; - - if (data->state != PWD_ID_Req) { - ret->ignore = TRUE; - eap_pwd_state(data, FAILURE); - return; - } - - if (payload_len < sizeof(struct eap_pwd_id)) { - ret->ignore = TRUE; - eap_pwd_state(data, FAILURE); - return; - } - - id = (struct eap_pwd_id *) payload; - data->group_num = be_to_host16(id->group_num); - wpa_printf(MSG_DEBUG, - "EAP-PWD: Server EAP-pwd-ID proposal: group=%u random=%u prf=%u prep=%u", - data->group_num, id->random_function, id->prf, id->prep); - if ((id->random_function != EAP_PWD_DEFAULT_RAND_FUNC) || - (id->prf != EAP_PWD_DEFAULT_PRF)) { - ret->ignore = TRUE; - eap_pwd_state(data, FAILURE); - return; - } - - if (id->prep != EAP_PWD_PREP_NONE && - id->prep != EAP_PWD_PREP_MS) { - wpa_printf(MSG_DEBUG, - "EAP-PWD: Unsupported password pre-processing technique (Prep=%u)", - id->prep); - eap_pwd_state(data, FAILURE); - return; - } - - if (id->prep == EAP_PWD_PREP_NONE && data->password_hash) { - wpa_printf(MSG_DEBUG, - "EAP-PWD: Unhashed password not available"); - eap_pwd_state(data, FAILURE); - return; - } - - wpa_printf(MSG_DEBUG, "EAP-PWD (peer): using group %d", - data->group_num); - - data->id_server = os_malloc(payload_len - sizeof(struct eap_pwd_id)); - if (data->id_server == NULL) { - wpa_printf(MSG_INFO, "EAP-PWD: memory allocation id fail"); - eap_pwd_state(data, FAILURE); - return; - } - data->id_server_len = payload_len - sizeof(struct eap_pwd_id); - os_memcpy(data->id_server, id->identity, data->id_server_len); - wpa_hexdump_ascii(MSG_INFO, "EAP-PWD (peer): server sent id of", - data->id_server, data->id_server_len); - - data->grp = os_zalloc(sizeof(EAP_PWD_group)); - if (data->grp == NULL) { - wpa_printf(MSG_INFO, "EAP-PWD: failed to allocate memory for " - "group"); - eap_pwd_state(data, FAILURE); - return; - } - - if (id->prep == EAP_PWD_PREP_MS) { -#ifdef CONFIG_FIPS - wpa_printf(MSG_ERROR, - "EAP-PWD (peer): MS password hash not supported in FIPS mode"); - eap_pwd_state(data, FAILURE); - return; -#else /* CONFIG_FIPS */ - if (data->password_hash) { - res = hash_nt_password_hash(data->password, pwhashhash); - } else { - u8 pwhash[16]; - - res = nt_password_hash(data->password, - data->password_len, pwhash); - if (res == 0) - res = hash_nt_password_hash(pwhash, pwhashhash); - os_memset(pwhash, 0, sizeof(pwhash)); - } - - if (res) { - eap_pwd_state(data, FAILURE); - return; - } - - password = pwhashhash; - password_len = sizeof(pwhashhash); -#endif /* CONFIG_FIPS */ - } else { - password = data->password; - password_len = data->password_len; - } - - /* compute PWE */ - res = compute_password_element(data->grp, data->group_num, - password, password_len, - data->id_server, data->id_server_len, - data->id_peer, data->id_peer_len, - id->token); - os_memset(pwhashhash, 0, sizeof(pwhashhash)); - if (res) { - wpa_printf(MSG_INFO, "EAP-PWD (peer): unable to compute PWE"); - eap_pwd_state(data, FAILURE); - return; - } - - wpa_printf(MSG_DEBUG, "EAP-PWD (peer): computed %d bit PWE...", - BN_num_bits(data->grp->prime)); - - data->outbuf = wpabuf_alloc(sizeof(struct eap_pwd_id) + - data->id_peer_len); - if (data->outbuf == NULL) { - eap_pwd_state(data, FAILURE); - return; - } - wpabuf_put_be16(data->outbuf, data->group_num); - wpabuf_put_u8(data->outbuf, EAP_PWD_DEFAULT_RAND_FUNC); - wpabuf_put_u8(data->outbuf, EAP_PWD_DEFAULT_PRF); - wpabuf_put_data(data->outbuf, id->token, sizeof(id->token)); - wpabuf_put_u8(data->outbuf, EAP_PWD_PREP_NONE); - wpabuf_put_data(data->outbuf, data->id_peer, data->id_peer_len); - - eap_pwd_state(data, PWD_Commit_Req); -} - - -static void -eap_pwd_perform_commit_exchange(struct eap_sm *sm, struct eap_pwd_data *data, - struct eap_method_ret *ret, - const struct wpabuf *reqData, - const u8 *payload, size_t payload_len) -{ - EC_POINT *K = NULL, *point = NULL; - BIGNUM *mask = NULL, *x = NULL, *y = NULL, *cofactor = NULL; - u16 offset; - u8 *ptr, *scalar = NULL, *element = NULL; - size_t prime_len, order_len; - - if (data->state != PWD_Commit_Req) { - ret->ignore = TRUE; - goto fin; - } - - prime_len = BN_num_bytes(data->grp->prime); - order_len = BN_num_bytes(data->grp->order); - - if (payload_len != 2 * prime_len + order_len) { - wpa_printf(MSG_INFO, - "EAP-pwd: Unexpected Commit payload length %u (expected %u)", - (unsigned int) payload_len, - (unsigned int) (2 * prime_len + order_len)); - goto fin; - } - - if (((data->private_value = BN_new()) == NULL) || - ((data->my_element = EC_POINT_new(data->grp->group)) == NULL) || - ((cofactor = BN_new()) == NULL) || - ((data->my_scalar = BN_new()) == NULL) || - ((mask = BN_new()) == NULL)) { - wpa_printf(MSG_INFO, "EAP-PWD (peer): scalar allocation fail"); - goto fin; - } - - if (!EC_GROUP_get_cofactor(data->grp->group, cofactor, NULL)) { - wpa_printf(MSG_INFO, "EAP-pwd (peer): unable to get cofactor " - "for curve"); - goto fin; - } - - if (BN_rand_range(data->private_value, data->grp->order) != 1 || - BN_rand_range(mask, data->grp->order) != 1 || - BN_add(data->my_scalar, data->private_value, mask) != 1 || - BN_mod(data->my_scalar, data->my_scalar, data->grp->order, - data->bnctx) != 1) { - wpa_printf(MSG_INFO, - "EAP-pwd (peer): unable to get randomness"); - goto fin; - } - - if (!EC_POINT_mul(data->grp->group, data->my_element, NULL, - data->grp->pwe, mask, data->bnctx)) { - wpa_printf(MSG_INFO, "EAP-PWD (peer): element allocation " - "fail"); - eap_pwd_state(data, FAILURE); - goto fin; - } - - if (!EC_POINT_invert(data->grp->group, data->my_element, data->bnctx)) - { - wpa_printf(MSG_INFO, "EAP-PWD (peer): element inversion fail"); - goto fin; - } - - if (((x = BN_new()) == NULL) || - ((y = BN_new()) == NULL)) { - wpa_printf(MSG_INFO, "EAP-PWD (peer): point allocation fail"); - goto fin; - } - - /* process the request */ - if (((data->server_scalar = BN_new()) == NULL) || - ((data->k = BN_new()) == NULL) || - ((K = EC_POINT_new(data->grp->group)) == NULL) || - ((point = EC_POINT_new(data->grp->group)) == NULL) || - ((data->server_element = EC_POINT_new(data->grp->group)) == NULL)) - { - wpa_printf(MSG_INFO, "EAP-PWD (peer): peer data allocation " - "fail"); - goto fin; - } - - /* element, x then y, followed by scalar */ - ptr = (u8 *) payload; - BN_bin2bn(ptr, BN_num_bytes(data->grp->prime), x); - ptr += BN_num_bytes(data->grp->prime); - BN_bin2bn(ptr, BN_num_bytes(data->grp->prime), y); - ptr += BN_num_bytes(data->grp->prime); - BN_bin2bn(ptr, BN_num_bytes(data->grp->order), data->server_scalar); - if (!EC_POINT_set_affine_coordinates_GFp(data->grp->group, - data->server_element, x, y, - data->bnctx)) { - wpa_printf(MSG_INFO, "EAP-PWD (peer): setting peer element " - "fail"); - goto fin; - } - - /* check to ensure server's element is not in a small sub-group */ - if (BN_cmp(cofactor, BN_value_one())) { - if (!EC_POINT_mul(data->grp->group, point, NULL, - data->server_element, cofactor, NULL)) { - wpa_printf(MSG_INFO, "EAP-PWD (peer): cannot multiply " - "server element by order!\n"); - goto fin; - } - if (EC_POINT_is_at_infinity(data->grp->group, point)) { - wpa_printf(MSG_INFO, "EAP-PWD (peer): server element " - "is at infinity!\n"); - goto fin; - } - } - - /* compute the shared key, k */ - if ((!EC_POINT_mul(data->grp->group, K, NULL, data->grp->pwe, - data->server_scalar, data->bnctx)) || - (!EC_POINT_add(data->grp->group, K, K, data->server_element, - data->bnctx)) || - (!EC_POINT_mul(data->grp->group, K, NULL, K, data->private_value, - data->bnctx))) { - wpa_printf(MSG_INFO, "EAP-PWD (peer): computing shared key " - "fail"); - goto fin; - } - - /* ensure that the shared key isn't in a small sub-group */ - if (BN_cmp(cofactor, BN_value_one())) { - if (!EC_POINT_mul(data->grp->group, K, NULL, K, cofactor, - NULL)) { - wpa_printf(MSG_INFO, "EAP-PWD (peer): cannot multiply " - "shared key point by order"); - goto fin; - } - } - - /* - * This check is strictly speaking just for the case above where - * co-factor > 1 but it was suggested that even though this is probably - * never going to happen it is a simple and safe check "just to be - * sure" so let's be safe. - */ - if (EC_POINT_is_at_infinity(data->grp->group, K)) { - wpa_printf(MSG_INFO, "EAP-PWD (peer): shared key point is at " - "infinity!\n"); - goto fin; - } - - if (!EC_POINT_get_affine_coordinates_GFp(data->grp->group, K, data->k, - NULL, data->bnctx)) { - wpa_printf(MSG_INFO, "EAP-PWD (peer): unable to extract " - "shared secret from point"); - goto fin; - } - - /* now do the response */ - if (!EC_POINT_get_affine_coordinates_GFp(data->grp->group, - data->my_element, x, y, - data->bnctx)) { - wpa_printf(MSG_INFO, "EAP-PWD (peer): point assignment fail"); - goto fin; - } - - if (((scalar = os_malloc(BN_num_bytes(data->grp->order))) == NULL) || - ((element = os_malloc(BN_num_bytes(data->grp->prime) * 2)) == - NULL)) { - wpa_printf(MSG_INFO, "EAP-PWD (peer): data allocation fail"); - goto fin; - } - - /* - * bignums occupy as little memory as possible so one that is - * sufficiently smaller than the prime or order might need pre-pending - * with zeros. - */ - os_memset(scalar, 0, BN_num_bytes(data->grp->order)); - os_memset(element, 0, BN_num_bytes(data->grp->prime) * 2); - offset = BN_num_bytes(data->grp->order) - - BN_num_bytes(data->my_scalar); - BN_bn2bin(data->my_scalar, scalar + offset); - - offset = BN_num_bytes(data->grp->prime) - BN_num_bytes(x); - BN_bn2bin(x, element + offset); - offset = BN_num_bytes(data->grp->prime) - BN_num_bytes(y); - BN_bn2bin(y, element + BN_num_bytes(data->grp->prime) + offset); - - data->outbuf = wpabuf_alloc(BN_num_bytes(data->grp->order) + - 2 * BN_num_bytes(data->grp->prime)); - if (data->outbuf == NULL) - goto fin; - - /* we send the element as (x,y) follwed by the scalar */ - wpabuf_put_data(data->outbuf, element, - 2 * BN_num_bytes(data->grp->prime)); - wpabuf_put_data(data->outbuf, scalar, BN_num_bytes(data->grp->order)); - -fin: - os_free(scalar); - os_free(element); - BN_clear_free(x); - BN_clear_free(y); - BN_clear_free(mask); - BN_clear_free(cofactor); - EC_POINT_clear_free(K); - EC_POINT_clear_free(point); - if (data->outbuf == NULL) - eap_pwd_state(data, FAILURE); - else - eap_pwd_state(data, PWD_Confirm_Req); -} - - -static void -eap_pwd_perform_confirm_exchange(struct eap_sm *sm, struct eap_pwd_data *data, - struct eap_method_ret *ret, - const struct wpabuf *reqData, - const u8 *payload, size_t payload_len) -{ - BIGNUM *x = NULL, *y = NULL; - struct crypto_hash *hash; - u32 cs; - u16 grp; - u8 conf[SHA256_MAC_LEN], *cruft = NULL, *ptr; - int offset; - - if (data->state != PWD_Confirm_Req) { - ret->ignore = TRUE; - goto fin; - } - - if (payload_len != SHA256_MAC_LEN) { - wpa_printf(MSG_INFO, - "EAP-pwd: Unexpected Confirm payload length %u (expected %u)", - (unsigned int) payload_len, SHA256_MAC_LEN); - goto fin; - } - - /* - * first build up the ciphersuite which is group | random_function | - * prf - */ - grp = htons(data->group_num); - ptr = (u8 *) &cs; - os_memcpy(ptr, &grp, sizeof(u16)); - ptr += sizeof(u16); - *ptr = EAP_PWD_DEFAULT_RAND_FUNC; - ptr += sizeof(u8); - *ptr = EAP_PWD_DEFAULT_PRF; - - /* each component of the cruft will be at most as big as the prime */ - if (((cruft = os_malloc(BN_num_bytes(data->grp->prime))) == NULL) || - ((x = BN_new()) == NULL) || ((y = BN_new()) == NULL)) { - wpa_printf(MSG_INFO, "EAP-PWD (server): confirm allocation " - "fail"); - goto fin; - } - - /* - * server's commit is H(k | server_element | server_scalar | - * peer_element | peer_scalar | ciphersuite) - */ - hash = eap_pwd_h_init(); - if (hash == NULL) - goto fin; - - /* - * zero the memory each time because this is mod prime math and some - * value may start with a few zeros and the previous one did not. - */ - os_memset(cruft, 0, BN_num_bytes(data->grp->prime)); - offset = BN_num_bytes(data->grp->prime) - BN_num_bytes(data->k); - BN_bn2bin(data->k, cruft + offset); - eap_pwd_h_update(hash, cruft, BN_num_bytes(data->grp->prime)); - - /* server element: x, y */ - if (!EC_POINT_get_affine_coordinates_GFp(data->grp->group, - data->server_element, x, y, - data->bnctx)) { - wpa_printf(MSG_INFO, "EAP-PWD (server): confirm point " - "assignment fail"); - goto fin; - } - os_memset(cruft, 0, BN_num_bytes(data->grp->prime)); - offset = BN_num_bytes(data->grp->prime) - BN_num_bytes(x); - BN_bn2bin(x, cruft + offset); - eap_pwd_h_update(hash, cruft, BN_num_bytes(data->grp->prime)); - os_memset(cruft, 0, BN_num_bytes(data->grp->prime)); - offset = BN_num_bytes(data->grp->prime) - BN_num_bytes(y); - BN_bn2bin(y, cruft + offset); - eap_pwd_h_update(hash, cruft, BN_num_bytes(data->grp->prime)); - - /* server scalar */ - os_memset(cruft, 0, BN_num_bytes(data->grp->prime)); - offset = BN_num_bytes(data->grp->order) - - BN_num_bytes(data->server_scalar); - BN_bn2bin(data->server_scalar, cruft + offset); - eap_pwd_h_update(hash, cruft, BN_num_bytes(data->grp->order)); - - /* my element: x, y */ - if (!EC_POINT_get_affine_coordinates_GFp(data->grp->group, - data->my_element, x, y, - data->bnctx)) { - wpa_printf(MSG_INFO, "EAP-PWD (server): confirm point " - "assignment fail"); - goto fin; - } - - os_memset(cruft, 0, BN_num_bytes(data->grp->prime)); - offset = BN_num_bytes(data->grp->prime) - BN_num_bytes(x); - BN_bn2bin(x, cruft + offset); - eap_pwd_h_update(hash, cruft, BN_num_bytes(data->grp->prime)); - os_memset(cruft, 0, BN_num_bytes(data->grp->prime)); - offset = BN_num_bytes(data->grp->prime) - BN_num_bytes(y); - BN_bn2bin(y, cruft + offset); - eap_pwd_h_update(hash, cruft, BN_num_bytes(data->grp->prime)); - - /* my scalar */ - os_memset(cruft, 0, BN_num_bytes(data->grp->prime)); - offset = BN_num_bytes(data->grp->order) - - BN_num_bytes(data->my_scalar); - BN_bn2bin(data->my_scalar, cruft + offset); - eap_pwd_h_update(hash, cruft, BN_num_bytes(data->grp->order)); - - /* the ciphersuite */ - eap_pwd_h_update(hash, (u8 *) &cs, sizeof(u32)); - - /* random function fin */ - eap_pwd_h_final(hash, conf); - - ptr = (u8 *) payload; - if (os_memcmp_const(conf, ptr, SHA256_MAC_LEN)) { - wpa_printf(MSG_INFO, "EAP-PWD (peer): confirm did not verify"); - goto fin; - } - - wpa_printf(MSG_DEBUG, "EAP-pwd (peer): confirm verified"); - - /* - * compute confirm: - * H(k | peer_element | peer_scalar | server_element | server_scalar | - * ciphersuite) - */ - hash = eap_pwd_h_init(); - if (hash == NULL) - goto fin; - - /* k */ - os_memset(cruft, 0, BN_num_bytes(data->grp->prime)); - offset = BN_num_bytes(data->grp->prime) - BN_num_bytes(data->k); - BN_bn2bin(data->k, cruft + offset); - eap_pwd_h_update(hash, cruft, BN_num_bytes(data->grp->prime)); - - /* my element */ - if (!EC_POINT_get_affine_coordinates_GFp(data->grp->group, - data->my_element, x, y, - data->bnctx)) { - wpa_printf(MSG_INFO, "EAP-PWD (peer): confirm point " - "assignment fail"); - goto fin; - } - os_memset(cruft, 0, BN_num_bytes(data->grp->prime)); - offset = BN_num_bytes(data->grp->prime) - BN_num_bytes(x); - BN_bn2bin(x, cruft + offset); - eap_pwd_h_update(hash, cruft, BN_num_bytes(data->grp->prime)); - os_memset(cruft, 0, BN_num_bytes(data->grp->prime)); - offset = BN_num_bytes(data->grp->prime) - BN_num_bytes(y); - BN_bn2bin(y, cruft + offset); - eap_pwd_h_update(hash, cruft, BN_num_bytes(data->grp->prime)); - - /* my scalar */ - os_memset(cruft, 0, BN_num_bytes(data->grp->prime)); - offset = BN_num_bytes(data->grp->order) - - BN_num_bytes(data->my_scalar); - BN_bn2bin(data->my_scalar, cruft + offset); - eap_pwd_h_update(hash, cruft, BN_num_bytes(data->grp->order)); - - /* server element: x, y */ - if (!EC_POINT_get_affine_coordinates_GFp(data->grp->group, - data->server_element, x, y, - data->bnctx)) { - wpa_printf(MSG_INFO, "EAP-PWD (peer): confirm point " - "assignment fail"); - goto fin; - } - os_memset(cruft, 0, BN_num_bytes(data->grp->prime)); - offset = BN_num_bytes(data->grp->prime) - BN_num_bytes(x); - BN_bn2bin(x, cruft + offset); - eap_pwd_h_update(hash, cruft, BN_num_bytes(data->grp->prime)); - os_memset(cruft, 0, BN_num_bytes(data->grp->prime)); - offset = BN_num_bytes(data->grp->prime) - BN_num_bytes(y); - BN_bn2bin(y, cruft + offset); - eap_pwd_h_update(hash, cruft, BN_num_bytes(data->grp->prime)); - - /* server scalar */ - os_memset(cruft, 0, BN_num_bytes(data->grp->prime)); - offset = BN_num_bytes(data->grp->order) - - BN_num_bytes(data->server_scalar); - BN_bn2bin(data->server_scalar, cruft + offset); - eap_pwd_h_update(hash, cruft, BN_num_bytes(data->grp->order)); - - /* the ciphersuite */ - eap_pwd_h_update(hash, (u8 *) &cs, sizeof(u32)); - - /* all done */ - eap_pwd_h_final(hash, conf); - - if (compute_keys(data->grp, data->bnctx, data->k, - data->my_scalar, data->server_scalar, conf, ptr, - &cs, data->msk, data->emsk, data->session_id) < 0) { - wpa_printf(MSG_INFO, "EAP-PWD (peer): unable to compute MSK | " - "EMSK"); - goto fin; - } - - data->outbuf = wpabuf_alloc(SHA256_MAC_LEN); - if (data->outbuf == NULL) - goto fin; - - wpabuf_put_data(data->outbuf, conf, SHA256_MAC_LEN); - -fin: - if (data->grp) - bin_clear_free(cruft, BN_num_bytes(data->grp->prime)); - BN_clear_free(x); - BN_clear_free(y); - if (data->outbuf == NULL) { - ret->methodState = METHOD_DONE; - ret->decision = DECISION_FAIL; - eap_pwd_state(data, FAILURE); - } else { - eap_pwd_state(data, SUCCESS_ON_FRAG_COMPLETION); - } -} - - -static struct wpabuf * -eap_pwd_process(struct eap_sm *sm, void *priv, struct eap_method_ret *ret, - const struct wpabuf *reqData) -{ - struct eap_pwd_data *data = priv; - struct wpabuf *resp = NULL; - const u8 *pos, *buf; - size_t len; - u16 tot_len = 0; - u8 lm_exch; - - pos = eap_hdr_validate(EAP_VENDOR_IETF, EAP_TYPE_PWD, reqData, &len); - if ((pos == NULL) || (len < 1)) { - wpa_printf(MSG_DEBUG, "EAP-pwd: Got a frame but pos is %s and " - "len is %d", - pos == NULL ? "NULL" : "not NULL", (int) len); - ret->ignore = TRUE; - return NULL; - } - - ret->ignore = FALSE; - ret->methodState = METHOD_MAY_CONT; - ret->decision = DECISION_FAIL; - ret->allowNotifications = FALSE; - - lm_exch = *pos; - pos++; /* skip over the bits and the exch */ - len--; - - /* - * we're fragmenting so send out the next fragment - */ - if (data->out_frag_pos) { - /* - * this should be an ACK - */ - if (len) - wpa_printf(MSG_INFO, "Bad Response! Fragmenting but " - "not an ACK"); - - wpa_printf(MSG_DEBUG, "EAP-pwd: Got an ACK for a fragment"); - /* - * check if there are going to be more fragments - */ - len = wpabuf_len(data->outbuf) - data->out_frag_pos; - if ((len + EAP_PWD_HDR_SIZE) > data->mtu) { - len = data->mtu - EAP_PWD_HDR_SIZE; - EAP_PWD_SET_MORE_BIT(lm_exch); - } - resp = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_PWD, - EAP_PWD_HDR_SIZE + len, - EAP_CODE_RESPONSE, eap_get_id(reqData)); - if (resp == NULL) { - wpa_printf(MSG_INFO, "Unable to allocate memory for " - "next fragment!"); - return NULL; - } - wpabuf_put_u8(resp, lm_exch); - buf = wpabuf_head_u8(data->outbuf); - wpabuf_put_data(resp, buf + data->out_frag_pos, len); - data->out_frag_pos += len; - /* - * this is the last fragment so get rid of the out buffer - */ - if (data->out_frag_pos >= wpabuf_len(data->outbuf)) { - wpabuf_free(data->outbuf); - data->outbuf = NULL; - data->out_frag_pos = 0; - } - wpa_printf(MSG_DEBUG, "EAP-pwd: Send %s fragment of %d bytes", - data->out_frag_pos == 0 ? "last" : "next", - (int) len); - if (data->state == SUCCESS_ON_FRAG_COMPLETION) { - ret->methodState = METHOD_DONE; - ret->decision = DECISION_UNCOND_SUCC; - eap_pwd_state(data, SUCCESS); - } - return resp; - } - - /* - * see if this is a fragment that needs buffering - * - * if it's the first fragment there'll be a length field - */ - if (EAP_PWD_GET_LENGTH_BIT(lm_exch)) { - if (len < 2) { - wpa_printf(MSG_DEBUG, - "EAP-pwd: Frame too short to contain Total-Length field"); - ret->ignore = TRUE; - return NULL; - } - tot_len = WPA_GET_BE16(pos); - wpa_printf(MSG_DEBUG, "EAP-pwd: Incoming fragments whose " - "total length = %d", tot_len); - if (tot_len > 15000) - return NULL; - if (data->inbuf) { - wpa_printf(MSG_DEBUG, - "EAP-pwd: Unexpected new fragment start when previous fragment is still in use"); - ret->ignore = TRUE; - return NULL; - } - data->inbuf = wpabuf_alloc(tot_len); - if (data->inbuf == NULL) { - wpa_printf(MSG_INFO, "Out of memory to buffer " - "fragments!"); - return NULL; - } - data->in_frag_pos = 0; - pos += sizeof(u16); - len -= sizeof(u16); - } - /* - * buffer and ACK the fragment - */ - if (EAP_PWD_GET_MORE_BIT(lm_exch) || data->in_frag_pos) { - data->in_frag_pos += len; - if (data->in_frag_pos > wpabuf_size(data->inbuf)) { - wpa_printf(MSG_INFO, "EAP-pwd: Buffer overflow attack " - "detected (%d vs. %d)!", - (int) data->in_frag_pos, - (int) wpabuf_len(data->inbuf)); - wpabuf_free(data->inbuf); - data->inbuf = NULL; - data->in_frag_pos = 0; - return NULL; - } - wpabuf_put_data(data->inbuf, pos, len); - } - if (EAP_PWD_GET_MORE_BIT(lm_exch)) { - resp = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_PWD, - EAP_PWD_HDR_SIZE, - EAP_CODE_RESPONSE, eap_get_id(reqData)); - if (resp != NULL) - wpabuf_put_u8(resp, (EAP_PWD_GET_EXCHANGE(lm_exch))); - wpa_printf(MSG_DEBUG, "EAP-pwd: ACKing a %d byte fragment", - (int) len); - return resp; - } - /* - * we're buffering and this is the last fragment - */ - if (data->in_frag_pos) { - wpa_printf(MSG_DEBUG, "EAP-pwd: Last fragment, %d bytes", - (int) len); - pos = wpabuf_head_u8(data->inbuf); - len = data->in_frag_pos; - } - wpa_printf(MSG_DEBUG, "EAP-pwd: processing frame: exch %d, len %d", - EAP_PWD_GET_EXCHANGE(lm_exch), (int) len); - - switch (EAP_PWD_GET_EXCHANGE(lm_exch)) { - case EAP_PWD_OPCODE_ID_EXCH: - eap_pwd_perform_id_exchange(sm, data, ret, reqData, - pos, len); - break; - case EAP_PWD_OPCODE_COMMIT_EXCH: - eap_pwd_perform_commit_exchange(sm, data, ret, reqData, - pos, len); - break; - case EAP_PWD_OPCODE_CONFIRM_EXCH: - eap_pwd_perform_confirm_exchange(sm, data, ret, reqData, - pos, len); - break; - default: - wpa_printf(MSG_INFO, "EAP-pwd: Ignoring message with unknown " - "opcode %d", lm_exch); - break; - } - /* - * if we buffered the just processed input now's the time to free it - */ - if (data->in_frag_pos) { - wpabuf_free(data->inbuf); - data->inbuf = NULL; - data->in_frag_pos = 0; - } - - if (data->outbuf == NULL) { - ret->methodState = METHOD_DONE; - ret->decision = DECISION_FAIL; - return NULL; /* generic failure */ - } - - /* - * we have output! Do we need to fragment it? - */ - lm_exch = EAP_PWD_GET_EXCHANGE(lm_exch); - len = wpabuf_len(data->outbuf); - if ((len + EAP_PWD_HDR_SIZE) > data->mtu) { - resp = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_PWD, data->mtu, - EAP_CODE_RESPONSE, eap_get_id(reqData)); - /* - * if so it's the first so include a length field - */ - EAP_PWD_SET_LENGTH_BIT(lm_exch); - EAP_PWD_SET_MORE_BIT(lm_exch); - tot_len = len; - /* - * keep the packet at the MTU - */ - len = data->mtu - EAP_PWD_HDR_SIZE - sizeof(u16); - wpa_printf(MSG_DEBUG, "EAP-pwd: Fragmenting output, total " - "length = %d", tot_len); - } else { - resp = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_PWD, - EAP_PWD_HDR_SIZE + len, - EAP_CODE_RESPONSE, eap_get_id(reqData)); - } - if (resp == NULL) - return NULL; - - wpabuf_put_u8(resp, lm_exch); - if (EAP_PWD_GET_LENGTH_BIT(lm_exch)) { - wpabuf_put_be16(resp, tot_len); - data->out_frag_pos += len; - } - buf = wpabuf_head_u8(data->outbuf); - wpabuf_put_data(resp, buf, len); - /* - * if we're not fragmenting then there's no need to carry this around - */ - if (data->out_frag_pos == 0) { - wpabuf_free(data->outbuf); - data->outbuf = NULL; - data->out_frag_pos = 0; - if (data->state == SUCCESS_ON_FRAG_COMPLETION) { - ret->methodState = METHOD_DONE; - ret->decision = DECISION_UNCOND_SUCC; - eap_pwd_state(data, SUCCESS); - } - } - - return resp; -} - - -static Boolean eap_pwd_key_available(struct eap_sm *sm, void *priv) -{ - struct eap_pwd_data *data = priv; - return data->state == SUCCESS; -} - - -static u8 * eap_pwd_get_emsk(struct eap_sm *sm, void *priv, size_t *len) -{ - struct eap_pwd_data *data = priv; - u8 *key; - - if (data->state != SUCCESS) - return NULL; - - if ((key = os_malloc(EAP_EMSK_LEN)) == NULL) - return NULL; - - os_memcpy(key, data->emsk, EAP_EMSK_LEN); - *len = EAP_EMSK_LEN; - - return key; -} - - -int eap_peer_pwd_register(void) -{ - struct eap_method *eap; - - eap = eap_peer_method_alloc(EAP_PEER_METHOD_INTERFACE_VERSION, - EAP_VENDOR_IETF, EAP_TYPE_PWD, "PWD"); - if (eap == NULL) - return -1; - - eap->init = eap_pwd_init; - eap->deinit = eap_pwd_deinit; - eap->process = eap_pwd_process; - eap->isKeyAvailable = eap_pwd_key_available; - eap->getKey = eap_pwd_getkey; - eap->getSessionId = eap_pwd_get_session_id; - eap->get_emsk = eap_pwd_get_emsk; - - return eap_peer_method_register(eap); -}