* EAP peer method: EAP-pwd (RFC 5931)
* Copyright (c) 2010, Dan Harkins <dharkins@lounge.org>
*
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the BSD license.
- *
- * Alternatively, this software may be distributed under the terms of the
- * GNU General Public License version 2 as published by the Free Software
- * Foundation.
- *
- * See README and COPYING for more details.
+ * 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, FAILURE
+ PWD_ID_Req, PWD_Commit_Req, PWD_Confirm_Req,
+ SUCCESS_ON_FRAG_COMPLETION, SUCCESS, FAILURE
} state;
u8 *id_peer;
size_t id_peer_len;
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;
u8 msk[EAP_MSK_LEN];
u8 emsk[EAP_EMSK_LEN];
+ u8 session_id[1 + SHA256_MAC_LEN];
BN_CTX *bnctx;
};
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:
static void eap_pwd_state(struct eap_pwd_data *data, int state)
{
- wpa_printf(MSG_INFO, "EAP-PWD: %s -> %s",
+ wpa_printf(MSG_DEBUG, "EAP-PWD: %s -> %s",
eap_pwd_state_txt(data->state), eap_pwd_state_txt(state));
data->state = state;
}
struct eap_pwd_data *data;
const u8 *identity, *password;
size_t identity_len, password_len;
+ int fragment_size;
+ int pwhash;
- password = eap_get_config_password(sm, &password_len);
+ password = eap_get_config_password2(sm, &password_len, &pwhash);
if (password == NULL) {
wpa_printf(MSG_INFO, "EAP-PWD: No password configured!");
return NULL;
if ((data->password = os_malloc(password_len)) == NULL) {
wpa_printf(MSG_INFO, "EAP-PWD: memory allocation psk fail");
BN_CTX_free(data->bnctx);
- os_free(data->id_peer);
+ 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;
{
struct eap_pwd_data *data = priv;
- BN_free(data->private_value);
- BN_free(data->server_scalar);
- BN_free(data->my_scalar);
- BN_free(data->k);
+ 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_free(data->my_element);
- EC_POINT_free(data->server_element);
- os_free(data->id_peer);
- os_free(data->id_server);
- os_free(data->password);
+ 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_free(data->grp->pwe);
- BN_free(data->grp->order);
- BN_free(data->grp->prime);
+ EC_POINT_clear_free(data->grp->pwe);
+ BN_clear_free(data->grp->order);
+ BN_clear_free(data->grp->prime);
os_free(data->grp);
}
- os_free(data);
+ wpabuf_free(data->inbuf);
+ wpabuf_free(data->outbuf);
+ bin_clear_free(data, sizeof(*data));
}
}
-static struct wpabuf *
+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;
- struct wpabuf *resp;
+ const u8 *password;
+ size_t password_len;
+ u8 pwhashhash[16];
+ int res;
if (data->state != PWD_ID_Req) {
ret->ignore = TRUE;
- return NULL;
+ eap_pwd_state(data, FAILURE);
+ return;
}
if (payload_len < sizeof(struct eap_pwd_id)) {
ret->ignore = TRUE;
- return NULL;
+ 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;
- return NULL;
+ 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;
}
- wpa_printf(MSG_DEBUG, "EAP-PWD (peer): server said group %d",
+ 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");
- return NULL;
+ 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);
- if ((data->grp = (EAP_PWD_group *) os_malloc(sizeof(EAP_PWD_group))) ==
- NULL) {
+ data->grp = os_zalloc(sizeof(EAP_PWD_group));
+ if (data->grp == NULL) {
wpa_printf(MSG_INFO, "EAP-PWD: failed to allocate memory for "
"group");
- return NULL;
+ 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 */
- if (compute_password_element(data->grp, data->group_num,
- data->password, data->password_len,
- data->id_server, data->id_server_len,
- data->id_peer, data->id_peer_len,
- id->token)) {
+ 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");
- return NULL;
+ eap_pwd_state(data, FAILURE);
+ return;
}
- wpa_printf(MSG_INFO, "EAP-PWD (peer): computed %d bit PWE...",
+ wpa_printf(MSG_DEBUG, "EAP-PWD (peer): computed %d bit PWE...",
BN_num_bits(data->grp->prime));
- resp = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_PWD,
- 1 + sizeof(struct eap_pwd_id) + data->id_peer_len,
- EAP_CODE_RESPONSE, eap_get_id(reqData));
- if (resp == NULL)
- return NULL;
-
- wpabuf_put_u8(resp, EAP_PWD_OPCODE_ID_EXCH);
- wpabuf_put_be16(resp, data->group_num);
- wpabuf_put_u8(resp, EAP_PWD_DEFAULT_RAND_FUNC);
- wpabuf_put_u8(resp, EAP_PWD_DEFAULT_PRF);
- wpabuf_put_data(resp, id->token, sizeof(id->token));
- wpabuf_put_u8(resp, EAP_PWD_PREP_NONE);
- wpabuf_put_data(resp, data->id_peer, data->id_peer_len);
+ 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);
-
- return resp;
}
-static struct wpabuf *
+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)
{
- struct wpabuf *resp = NULL;
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) ||
goto fin;
}
- BN_rand_range(data->private_value, data->grp->order);
- BN_rand_range(mask, data->grp->order);
- BN_add(data->my_scalar, data->private_value, mask);
- BN_mod(data->my_scalar, data->my_scalar, data->grp->order,
- data->bnctx);
+ 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 inversion fail");
goto fin;
}
- BN_free(mask);
+ BN_clear_free(mask);
if (((x = BN_new()) == NULL) ||
((y = BN_new()) == NULL)) {
offset = BN_num_bytes(data->grp->prime) - BN_num_bytes(y);
BN_bn2bin(y, element + BN_num_bytes(data->grp->prime) + offset);
- resp = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_PWD,
- sizeof(struct eap_pwd_hdr) +
- BN_num_bytes(data->grp->order) +
- (2 * BN_num_bytes(data->grp->prime)),
- EAP_CODE_RESPONSE, eap_get_id(reqData));
- if (resp == NULL)
+ data->outbuf = wpabuf_alloc(BN_num_bytes(data->grp->order) +
+ 2 * BN_num_bytes(data->grp->prime));
+ if (data->outbuf == NULL)
goto fin;
- wpabuf_put_u8(resp, EAP_PWD_OPCODE_COMMIT_EXCH);
-
/* we send the element as (x,y) follwed by the scalar */
- wpabuf_put_data(resp, element, (2 * BN_num_bytes(data->grp->prime)));
- wpabuf_put_data(resp, scalar, BN_num_bytes(data->grp->order));
+ 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_free(x);
- BN_free(y);
- BN_free(cofactor);
- EC_POINT_free(K);
- EC_POINT_free(point);
- if (resp == NULL)
+ BN_clear_free(x);
+ BN_clear_free(y);
+ 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);
-
- return resp;
}
-static struct wpabuf *
+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)
{
- struct wpabuf *resp = NULL;
BIGNUM *x = NULL, *y = NULL;
- HMAC_CTX ctx;
+ struct crypto_hash *hash;
u32 cs;
- u8 conf[SHA256_DIGEST_LENGTH], *cruft = NULL, *ptr;
+ 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, &data->group_num, sizeof(u16));
+ os_memcpy(ptr, &grp, sizeof(u16));
ptr += sizeof(u16);
*ptr = EAP_PWD_DEFAULT_RAND_FUNC;
ptr += sizeof(u8);
/* 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): debug allocation "
+ 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)
*/
- H_Init(&ctx);
+ 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));
- BN_bn2bin(data->k, cruft);
- H_Update(&ctx, cruft, 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,
goto fin;
}
os_memset(cruft, 0, BN_num_bytes(data->grp->prime));
- BN_bn2bin(x, cruft);
- H_Update(&ctx, cruft, 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));
- BN_bn2bin(y, cruft);
- H_Update(&ctx, cruft, 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));
- BN_bn2bin(data->server_scalar, cruft);
- H_Update(&ctx, cruft, BN_num_bytes(data->grp->order));
+ 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,
}
os_memset(cruft, 0, BN_num_bytes(data->grp->prime));
- BN_bn2bin(x, cruft);
- H_Update(&ctx, cruft, 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));
- BN_bn2bin(y, cruft);
- H_Update(&ctx, cruft, 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));
- BN_bn2bin(data->my_scalar, cruft);
- H_Update(&ctx, cruft, BN_num_bytes(data->grp->order));
+ 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 */
- H_Update(&ctx, (u8 *) &cs, sizeof(u32));
+ eap_pwd_h_update(hash, (u8 *) &cs, sizeof(u32));
/* random function fin */
- H_Final(&ctx, conf);
+ eap_pwd_h_final(hash, conf);
ptr = (u8 *) payload;
- if (os_memcmp(conf, ptr, SHA256_DIGEST_LENGTH)) {
+ if (os_memcmp_const(conf, ptr, SHA256_MAC_LEN)) {
wpa_printf(MSG_INFO, "EAP-PWD (peer): confirm did not verify");
goto fin;
}
* H(k | peer_element | peer_scalar | server_element | server_scalar |
* ciphersuite)
*/
- H_Init(&ctx);
+ hash = eap_pwd_h_init();
+ if (hash == NULL)
+ goto fin;
/* k */
os_memset(cruft, 0, BN_num_bytes(data->grp->prime));
- BN_bn2bin(data->k, cruft);
- H_Update(&ctx, cruft, 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,
goto fin;
}
os_memset(cruft, 0, BN_num_bytes(data->grp->prime));
- BN_bn2bin(x, cruft);
- H_Update(&ctx, cruft, 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));
- BN_bn2bin(y, cruft);
- H_Update(&ctx, cruft, 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));
- BN_bn2bin(data->my_scalar, cruft);
- H_Update(&ctx, cruft, BN_num_bytes(data->grp->order));
+ 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,
goto fin;
}
os_memset(cruft, 0, BN_num_bytes(data->grp->prime));
- BN_bn2bin(x, cruft);
- H_Update(&ctx, cruft, 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));
- BN_bn2bin(y, cruft);
- H_Update(&ctx, cruft, 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));
- BN_bn2bin(data->server_scalar, cruft);
- H_Update(&ctx, cruft, BN_num_bytes(data->grp->order));
+ 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 */
- H_Update(&ctx, (u8 *) &cs, sizeof(u32));
+ eap_pwd_h_update(hash, (u8 *) &cs, sizeof(u32));
/* all done */
- H_Final(&ctx, conf);
-
- resp = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_PWD,
- sizeof(struct eap_pwd_hdr) + SHA256_DIGEST_LENGTH,
- EAP_CODE_RESPONSE, eap_get_id(reqData));
- if (resp == NULL)
- goto fin;
-
- wpabuf_put_u8(resp, EAP_PWD_OPCODE_CONFIRM_EXCH);
- wpabuf_put_data(resp, conf, SHA256_DIGEST_LENGTH);
+ eap_pwd_h_final(hash, conf);
- if (compute_keys(data->grp, data->bnctx, data->k, data->server_element,
- data->my_element, data->server_scalar,
- data->my_scalar, &cs, data->msk, data->emsk) < 0) {
+ 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:
- os_free(cruft);
- BN_free(x);
- BN_free(y);
- ret->methodState = METHOD_DONE;
- if (resp == NULL) {
+ 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 {
- ret->decision = DECISION_UNCOND_SUCC;
- eap_pwd_state(data, SUCCESS);
+ eap_pwd_state(data, SUCCESS_ON_FRAG_COMPLETION);
}
-
- return resp;
}
{
struct eap_pwd_data *data = priv;
struct wpabuf *resp = NULL;
- const u8 *pos;
+ const u8 *pos, *buf;
size_t len;
- u8 exch;
+ 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;
}
- wpa_printf(MSG_INFO, "EAP-pwd: Received frame: opcode %d", *pos);
-
ret->ignore = FALSE;
ret->methodState = METHOD_MAY_CONT;
ret->decision = DECISION_FAIL;
ret->allowNotifications = FALSE;
- exch = *pos & 0x3f;
- switch (exch) {
- case EAP_PWD_OPCODE_ID_EXCH:
- resp = eap_pwd_perform_id_exchange(sm, data, ret, reqData,
- pos + 1, len - 1);
+ 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 += 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);
+
+ 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) {
+ wpabuf_put_data(data->inbuf, pos, len);
+ wpa_printf(MSG_DEBUG, "EAP-pwd: Last fragment, %d bytes",
+ (int) len);
+ data->in_frag_pos += 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:
- resp = eap_pwd_perform_commit_exchange(sm, data, ret, reqData,
- pos + 1, len - 1);
+ case EAP_PWD_OPCODE_COMMIT_EXCH:
+ eap_pwd_perform_commit_exchange(sm, data, ret, reqData,
+ pos, len);
break;
- case EAP_PWD_OPCODE_CONFIRM_EXCH:
- resp = eap_pwd_perform_confirm_exchange(sm, data, ret, reqData,
- pos + 1, len - 1);
+ case EAP_PWD_OPCODE_CONFIRM_EXCH:
+ eap_pwd_perform_confirm_exchange(sm, data, ret, reqData,
+ pos, len);
break;
- default:
+ default:
wpa_printf(MSG_INFO, "EAP-pwd: Ignoring message with unknown "
- "opcode %d", exch);
+ "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;
}
struct eap_method *eap;
int ret;
- EVP_add_digest(EVP_sha256());
eap = eap_peer_method_alloc(EAP_PEER_METHOD_INTERFACE_VERSION,
EAP_VENDOR_IETF, EAP_TYPE_PWD, "PWD");
if (eap == NULL)
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;
ret = eap_peer_method_register(eap);
projects / mech_eap.git / blobdiff