/*
* EAP peer/server: EAP-SIM/AKA/AKA' shared routines
* Copyright (c) 2004-2008, Jouni Malinen <j@w1.fi>
*
* This software may be distributed under the terms of the BSD license.
* See README for more details.
*/
#include "includes.h"
#include "common.h"
#include "wpabuf.h"
#include "crypto/aes_wrap.h"
#include "crypto/crypto.h"
#include "crypto/sha1.h"
#include "crypto/sha256.h"
#include "crypto/random.h"
#include "eap_common/eap_defs.h"
#include "eap_common/eap_sim_common.h"
static int eap_sim_prf(const u8 *key, u8 *x, size_t xlen)
{
return fips186_2_prf(key, EAP_SIM_MK_LEN, x, xlen);
}
void eap_sim_derive_mk(const u8 *identity, size_t identity_len,
const u8 *nonce_mt, u16 selected_version,
const u8 *ver_list, size_t ver_list_len,
int num_chal, const u8 *kc, u8 *mk)
{
u8 sel_ver[2];
const unsigned char *addr[5];
size_t len[5];
addr[0] = identity;
len[0] = identity_len;
addr[1] = kc;
len[1] = num_chal * EAP_SIM_KC_LEN;
addr[2] = nonce_mt;
len[2] = EAP_SIM_NONCE_MT_LEN;
addr[3] = ver_list;
len[3] = ver_list_len;
addr[4] = sel_ver;
len[4] = 2;
WPA_PUT_BE16(sel_ver, selected_version);
/* MK = SHA1(Identity|n*Kc|NONCE_MT|Version List|Selected Version) */
sha1_vector(5, addr, len, mk);
wpa_hexdump_key(MSG_DEBUG, "EAP-SIM: MK", mk, EAP_SIM_MK_LEN);
}
void eap_aka_derive_mk(const u8 *identity, size_t identity_len,
const u8 *ik, const u8 *ck, u8 *mk)
{
const u8 *addr[3];
size_t len[3];
addr[0] = identity;
len[0] = identity_len;
addr[1] = ik;
len[1] = EAP_AKA_IK_LEN;
addr[2] = ck;
len[2] = EAP_AKA_CK_LEN;
/* MK = SHA1(Identity|IK|CK) */
sha1_vector(3, addr, len, mk);
wpa_hexdump_key(MSG_DEBUG, "EAP-AKA: IK", ik, EAP_AKA_IK_LEN);
wpa_hexdump_key(MSG_DEBUG, "EAP-AKA: CK", ck, EAP_AKA_CK_LEN);
wpa_hexdump_key(MSG_DEBUG, "EAP-AKA: MK", mk, EAP_SIM_MK_LEN);
}
int eap_sim_derive_keys(const u8 *mk, u8 *k_encr, u8 *k_aut, u8 *msk, u8 *emsk)
{
u8 buf[EAP_SIM_K_ENCR_LEN + EAP_SIM_K_AUT_LEN +
EAP_SIM_KEYING_DATA_LEN + EAP_EMSK_LEN], *pos;
if (eap_sim_prf(mk, buf, sizeof(buf)) < 0) {
wpa_printf(MSG_ERROR, "EAP-SIM: Failed to derive keys");
return -1;
}
pos = buf;
os_memcpy(k_encr, pos, EAP_SIM_K_ENCR_LEN);
pos += EAP_SIM_K_ENCR_LEN;
os_memcpy(k_aut, pos, EAP_SIM_K_AUT_LEN);
pos += EAP_SIM_K_AUT_LEN;
os_memcpy(msk, pos, EAP_SIM_KEYING_DATA_LEN);
pos += EAP_SIM_KEYING_DATA_LEN;
os_memcpy(emsk, pos, EAP_EMSK_LEN);
wpa_hexdump_key(MSG_DEBUG, "EAP-SIM: K_encr",
k_encr, EAP_SIM_K_ENCR_LEN);
wpa_hexdump_key(MSG_DEBUG, "EAP-SIM: K_aut",
k_aut, EAP_SIM_K_AUT_LEN);
wpa_hexdump_key(MSG_DEBUG, "EAP-SIM: keying material (MSK)",
msk, EAP_SIM_KEYING_DATA_LEN);
wpa_hexdump_key(MSG_DEBUG, "EAP-SIM: EMSK", emsk, EAP_EMSK_LEN);
os_memset(buf, 0, sizeof(buf));
return 0;
}
int eap_sim_derive_keys_reauth(u16 _counter,
const u8 *identity, size_t identity_len,
const u8 *nonce_s, const u8 *mk, u8 *msk,
u8 *emsk)
{
u8 xkey[SHA1_MAC_LEN];
u8 buf[EAP_SIM_KEYING_DATA_LEN + EAP_EMSK_LEN + 32];
u8 counter[2];
const u8 *addr[4];
size_t len[4];
while (identity_len > 0 && identity[identity_len - 1] == 0) {
wpa_printf(MSG_DEBUG, "EAP-SIM: Workaround - drop null "
"character from the end of identity");
identity_len--;
}
addr[0] = identity;
len[0] = identity_len;
addr[1] = counter;
len[1] = 2;
addr[2] = nonce_s;
len[2] = EAP_SIM_NONCE_S_LEN;
addr[3] = mk;
len[3] = EAP_SIM_MK_LEN;
WPA_PUT_BE16(counter, _counter);
wpa_printf(MSG_DEBUG, "EAP-SIM: Deriving keying data from reauth");
wpa_hexdump_ascii(MSG_DEBUG, "EAP-SIM: Identity",
identity, identity_len);
wpa_hexdump(MSG_DEBUG, "EAP-SIM: counter", counter, 2);
wpa_hexdump(MSG_DEBUG, "EAP-SIM: NONCE_S", nonce_s,
EAP_SIM_NONCE_S_LEN);
wpa_hexdump_key(MSG_DEBUG, "EAP-SIM: MK", mk, EAP_SIM_MK_LEN);
/* XKEY' = SHA1(Identity|counter|NONCE_S|MK) */
sha1_vector(4, addr, len, xkey);
wpa_hexdump(MSG_DEBUG, "EAP-SIM: XKEY'", xkey, SHA1_MAC_LEN);
if (eap_sim_prf(xkey, buf, sizeof(buf)) < 0) {
wpa_printf(MSG_ERROR, "EAP-SIM: Failed to derive keys");
return -1;
}
if (msk) {
os_memcpy(msk, buf, EAP_SIM_KEYING_DATA_LEN);
wpa_hexdump(MSG_DEBUG, "EAP-SIM: keying material (MSK)",
msk, EAP_SIM_KEYING_DATA_LEN);
}
if (emsk) {
os_memcpy(emsk, buf + EAP_SIM_KEYING_DATA_LEN, EAP_EMSK_LEN);
wpa_hexdump(MSG_DEBUG, "EAP-SIM: EMSK", emsk, EAP_EMSK_LEN);
}
os_memset(buf, 0, sizeof(buf));
return 0;
}
int eap_sim_verify_mac(const u8 *k_aut, const struct wpabuf *req,
const u8 *mac, const u8 *extra, size_t extra_len)
{
unsigned char hmac[SHA1_MAC_LEN];
const u8 *addr[2];
size_t len[2];
u8 *tmp;
if (mac == NULL || wpabuf_len(req) < EAP_SIM_MAC_LEN ||
mac < wpabuf_head_u8(req) ||
mac > wpabuf_head_u8(req) + wpabuf_len(req) - EAP_SIM_MAC_LEN)
return -1;
tmp = os_malloc(wpabuf_len(req));
if (tmp == NULL)
return -1;
addr[0] = tmp;
len[0] = wpabuf_len(req);
addr[1] = extra;
len[1] = extra_len;
/* HMAC-SHA1-128 */
os_memcpy(tmp, wpabuf_head(req), wpabuf_len(req));
os_memset(tmp + (mac - wpabuf_head_u8(req)), 0, EAP_SIM_MAC_LEN);
wpa_hexdump(MSG_MSGDUMP, "EAP-SIM: Verify MAC - msg",
tmp, wpabuf_len(req));
wpa_hexdump(MSG_MSGDUMP, "EAP-SIM: Verify MAC - extra data",
extra, extra_len);
wpa_hexdump_key(MSG_MSGDUMP, "EAP-SIM: Verify MAC - K_aut",
k_aut, EAP_SIM_K_AUT_LEN);
hmac_sha1_vector(k_aut, EAP_SIM_K_AUT_LEN, 2, addr, len, hmac);
wpa_hexdump(MSG_MSGDUMP, "EAP-SIM: Verify MAC: MAC",
hmac, EAP_SIM_MAC_LEN);
os_free(tmp);
return (os_memcmp_const(hmac, mac, EAP_SIM_MAC_LEN) == 0) ? 0 : 1;
}
void eap_sim_add_mac(const u8 *k_aut, const u8 *msg, size_t msg_len, u8 *mac,
const u8 *extra, size_t extra_len)
{
unsigned char hmac[SHA1_MAC_LEN];
const u8 *addr[2];
size_t len[2];
addr[0] = msg;
len[0] = msg_len;
addr[1] = extra;
len[1] = extra_len;
/* HMAC-SHA1-128 */
os_memset(mac, 0, EAP_SIM_MAC_LEN);
wpa_hexdump(MSG_MSGDUMP, "EAP-SIM: Add MAC - msg", msg, msg_len);
wpa_hexdump(MSG_MSGDUMP, "EAP-SIM: Add MAC - extra data",
extra, extra_len);
wpa_hexdump_key(MSG_MSGDUMP, "EAP-SIM: Add MAC - K_aut",
k_aut, EAP_SIM_K_AUT_LEN);
hmac_sha1_vector(k_aut, EAP_SIM_K_AUT_LEN, 2, addr, len, hmac);
os_memcpy(mac, hmac, EAP_SIM_MAC_LEN);
wpa_hexdump(MSG_MSGDUMP, "EAP-SIM: Add MAC: MAC",
mac, EAP_SIM_MAC_LEN);
}
#if defined(EAP_AKA_PRIME) || defined(EAP_SERVER_AKA_PRIME)
static void prf_prime(const u8 *k, const char *seed1,
const u8 *seed2, size_t seed2_len,
const u8 *seed3, size_t seed3_len,
u8 *res, size_t res_len)
{
const u8 *addr[5];
size_t len[5];
u8 hash[SHA256_MAC_LEN];
u8 iter;
/*
* PRF'(K,S) = T1 | T2 | T3 | T4 | ...
* T1 = HMAC-SHA-256 (K, S | 0x01)
* T2 = HMAC-SHA-256 (K, T1 | S | 0x02)
* T3 = HMAC-SHA-256 (K, T2 | S | 0x03)
* T4 = HMAC-SHA-256 (K, T3 | S | 0x04)
* ...
*/
addr[0] = hash;
len[0] = 0;
addr[1] = (const u8 *) seed1;
len[1] = os_strlen(seed1);
addr[2] = seed2;
len[2] = seed2_len;
addr[3] = seed3;
len[3] = seed3_len;
addr[4] = &iter;
len[4] = 1;
iter = 0;
while (res_len) {
size_t hlen;
iter++;
hmac_sha256_vector(k, 32, 5, addr, len, hash);
len[0] = SHA256_MAC_LEN;
hlen = res_len > SHA256_MAC_LEN ? SHA256_MAC_LEN : res_len;
os_memcpy(res, hash, hlen);
res += hlen;
res_len -= hlen;
}
}
void eap_aka_prime_derive_keys(const u8 *identity, size_t identity_len,
const u8 *ik, const u8 *ck, u8 *k_encr,
u8 *k_aut, u8 *k_re, u8 *msk, u8 *emsk)
{
u8 key[EAP_AKA_IK_LEN + EAP_AKA_CK_LEN];
u8 keys[EAP_SIM_K_ENCR_LEN + EAP_AKA_PRIME_K_AUT_LEN +
EAP_AKA_PRIME_K_RE_LEN + EAP_MSK_LEN + EAP_EMSK_LEN];
u8 *pos;
/*
* MK = PRF'(IK'|CK',"EAP-AKA'"|Identity)
* K_encr = MK[0..127]
* K_aut = MK[128..383]
* K_re = MK[384..639]
* MSK = MK[640..1151]
* EMSK = MK[1152..1663]
*/
os_memcpy(key, ik, EAP_AKA_IK_LEN);
os_memcpy(key + EAP_AKA_IK_LEN, ck, EAP_AKA_CK_LEN);
prf_prime(key, "EAP-AKA'", identity, identity_len, NULL, 0,
keys, sizeof(keys));
pos = keys;
os_memcpy(k_encr, pos, EAP_SIM_K_ENCR_LEN);
wpa_hexdump_key(MSG_DEBUG, "EAP-AKA': K_encr",
k_encr, EAP_SIM_K_ENCR_LEN);
pos += EAP_SIM_K_ENCR_LEN;
os_memcpy(k_aut, pos, EAP_AKA_PRIME_K_AUT_LEN);
wpa_hexdump_key(MSG_DEBUG, "EAP-AKA': K_aut",
k_aut, EAP_AKA_PRIME_K_AUT_LEN);
pos += EAP_AKA_PRIME_K_AUT_LEN;
os_memcpy(k_re, pos, EAP_AKA_PRIME_K_RE_LEN);
wpa_hexdump_key(MSG_DEBUG, "EAP-AKA': K_re",
k_re, EAP_AKA_PRIME_K_RE_LEN);
pos += EAP_AKA_PRIME_K_RE_LEN;
os_memcpy(msk, pos, EAP_MSK_LEN);
wpa_hexdump_key(MSG_DEBUG, "EAP-AKA': MSK", msk, EAP_MSK_LEN);
pos += EAP_MSK_LEN;
os_memcpy(emsk, pos, EAP_EMSK_LEN);
wpa_hexdump_key(MSG_DEBUG, "EAP-AKA': EMSK", emsk, EAP_EMSK_LEN);
}
int eap_aka_prime_derive_keys_reauth(const u8 *k_re, u16 counter,
const u8 *identity, size_t identity_len,
const u8 *nonce_s, u8 *msk, u8 *emsk)
{
u8 seed3[2 + EAP_SIM_NONCE_S_LEN];
u8 keys[EAP_MSK_LEN + EAP_EMSK_LEN];
u8 *pos;
/*
* MK = PRF'(K_re,"EAP-AKA' re-auth"|Identity|counter|NONCE_S)
* MSK = MK[0..511]
* EMSK = MK[512..1023]
*/
WPA_PUT_BE16(seed3, counter);
os_memcpy(seed3 + 2, nonce_s, EAP_SIM_NONCE_S_LEN);
prf_prime(k_re, "EAP-AKA' re-auth", identity, identity_len,
seed3, sizeof(seed3),
keys, sizeof(keys));
pos = keys;
os_memcpy(msk, pos, EAP_MSK_LEN);
wpa_hexdump_key(MSG_DEBUG, "EAP-AKA': MSK", msk, EAP_MSK_LEN);
pos += EAP_MSK_LEN;
os_memcpy(emsk, pos, EAP_EMSK_LEN);
wpa_hexdump_key(MSG_DEBUG, "EAP-AKA': EMSK", emsk, EAP_EMSK_LEN);
os_memset(keys, 0, sizeof(keys));
return 0;
}
int eap_sim_verify_mac_sha256(const u8 *k_aut, const struct wpabuf *req,
const u8 *mac, const u8 *extra, size_t extra_len)
{
unsigned char hmac[SHA256_MAC_LEN];
const u8 *addr[2];
size_t len[2];
u8 *tmp;
if (mac == NULL || wpabuf_len(req) < EAP_SIM_MAC_LEN ||
mac < wpabuf_head_u8(req) ||
mac > wpabuf_head_u8(req) + wpabuf_len(req) - EAP_SIM_MAC_LEN)
return -1;
tmp = os_malloc(wpabuf_len(req));
if (tmp == NULL)
return -1;
addr[0] = tmp;
len[0] = wpabuf_len(req);
addr[1] = extra;
len[1] = extra_len;
/* HMAC-SHA-256-128 */
os_memcpy(tmp, wpabuf_head(req), wpabuf_len(req));
os_memset(tmp + (mac - wpabuf_head_u8(req)), 0, EAP_SIM_MAC_LEN);
wpa_hexdump(MSG_MSGDUMP, "EAP-AKA': Verify MAC - msg",
tmp, wpabuf_len(req));
wpa_hexdump(MSG_MSGDUMP, "EAP-AKA': Verify MAC - extra data",
extra, extra_len);
wpa_hexdump_key(MSG_MSGDUMP, "EAP-AKA': Verify MAC - K_aut",
k_aut, EAP_AKA_PRIME_K_AUT_LEN);
hmac_sha256_vector(k_aut, EAP_AKA_PRIME_K_AUT_LEN, 2, addr, len, hmac);
wpa_hexdump(MSG_MSGDUMP, "EAP-AKA': Verify MAC: MAC",
hmac, EAP_SIM_MAC_LEN);
os_free(tmp);
return (os_memcmp_const(hmac, mac, EAP_SIM_MAC_LEN) == 0) ? 0 : 1;
}
void eap_sim_add_mac_sha256(const u8 *k_aut, const u8 *msg, size_t msg_len,
u8 *mac, const u8 *extra, size_t extra_len)
{
unsigned char hmac[SHA256_MAC_LEN];
const u8 *addr[2];
size_t len[2];
addr[0] = msg;
len[0] = msg_len;
addr[1] = extra;
len[1] = extra_len;
/* HMAC-SHA-256-128 */
os_memset(mac, 0, EAP_SIM_MAC_LEN);
wpa_hexdump(MSG_MSGDUMP, "EAP-AKA': Add MAC - msg", msg, msg_len);
wpa_hexdump(MSG_MSGDUMP, "EAP-AKA': Add MAC - extra data",
extra, extra_len);
wpa_hexdump_key(MSG_MSGDUMP, "EAP-AKA': Add MAC - K_aut",
k_aut, EAP_AKA_PRIME_K_AUT_LEN);
hmac_sha256_vector(k_aut, EAP_AKA_PRIME_K_AUT_LEN, 2, addr, len, hmac);
os_memcpy(mac, hmac, EAP_SIM_MAC_LEN);
wpa_hexdump(MSG_MSGDUMP, "EAP-AKA': Add MAC: MAC",
mac, EAP_SIM_MAC_LEN);
}
void eap_aka_prime_derive_ck_ik_prime(u8 *ck, u8 *ik, const u8 *sqn_ak,
const u8 *network_name,
size_t network_name_len)
{
u8 key[EAP_AKA_CK_LEN + EAP_AKA_IK_LEN];
u8 hash[SHA256_MAC_LEN];
const u8 *addr[5];
size_t len[5];
u8 fc;
u8 l0[2], l1[2];
/* 3GPP TS 33.402 V8.0.0
* (CK', IK') = F(CK, IK, <access network identity>)
*/
/* TODO: CK', IK' generation should really be moved into the actual
* AKA procedure with network name passed in there and option to use
* AMF separation bit = 1 (3GPP TS 33.401). */
/* Change Request 33.402 CR 0033 to version 8.1.1 from
* 3GPP TSG-SA WG3 Meeting #53 in September 2008:
*
* CK' || IK' = HMAC-SHA-256(Key, S)
* S = FC || P0 || L0 || P1 || L1 || ... || Pn || Ln
* Key = CK || IK
* FC = 0x20
* P0 = access network identity (3GPP TS 24.302)
* L0 = length of acceess network identity (2 octets, big endian)
* P1 = SQN xor AK (if AK is not used, AK is treaded as 000..0
* L1 = 0x00 0x06
*/
fc = 0x20;
wpa_printf(MSG_DEBUG, "EAP-AKA': Derive (CK',IK') from (CK,IK)");
wpa_hexdump_key(MSG_DEBUG, "EAP-AKA': CK", ck, EAP_AKA_CK_LEN);
wpa_hexdump_key(MSG_DEBUG, "EAP-AKA': IK", ik, EAP_AKA_IK_LEN);
wpa_printf(MSG_DEBUG, "EAP-AKA': FC = 0x%x", fc);
wpa_hexdump_ascii(MSG_DEBUG, "EAP-AKA': P0 = Access network identity",
network_name, network_name_len);
wpa_hexdump(MSG_DEBUG, "EAP-AKA': P1 = SQN xor AK", sqn_ak, 6);
os_memcpy(key, ck, EAP_AKA_CK_LEN);
os_memcpy(key + EAP_AKA_CK_LEN, ik, EAP_AKA_IK_LEN);
wpa_hexdump_key(MSG_DEBUG, "EAP-AKA': Key = CK || IK",
key, sizeof(key));
addr[0] = &fc;
len[0] = 1;
addr[1] = network_name;
len[1] = network_name_len;
WPA_PUT_BE16(l0, network_name_len);
addr[2] = l0;
len[2] = 2;
addr[3] = sqn_ak;
len[3] = 6;
WPA_PUT_BE16(l1, 6);
addr[4] = l1;
len[4] = 2;
hmac_sha256_vector(key, sizeof(key), 5, addr, len, hash);
wpa_hexdump_key(MSG_DEBUG, "EAP-AKA': KDF output (CK' || IK')",
hash, sizeof(hash));
os_memcpy(ck, hash, EAP_AKA_CK_LEN);
os_memcpy(ik, hash + EAP_AKA_CK_LEN, EAP_AKA_IK_LEN);
wpa_hexdump_key(MSG_DEBUG, "EAP-AKA': CK'", ck, EAP_AKA_CK_LEN);
wpa_hexdump_key(MSG_DEBUG, "EAP-AKA': IK'", ik, EAP_AKA_IK_LEN);
}
#endif /* EAP_AKA_PRIME || EAP_SERVER_AKA_PRIME */
int eap_sim_parse_attr(const u8 *start, const u8 *end,
struct eap_sim_attrs *attr, int aka, int encr)
{
const u8 *pos = start, *apos;
size_t alen, plen, i, list_len;
os_memset(attr, 0, sizeof(*attr));
attr->id_req = NO_ID_REQ;
attr->notification = -1;
attr->counter = -1;
attr->selected_version = -1;
attr->client_error_code = -1;
while (pos < end) {
if (pos + 2 > end) {
wpa_printf(MSG_INFO, "EAP-SIM: Attribute overflow(1)");
return -1;
}
wpa_printf(MSG_MSGDUMP, "EAP-SIM: Attribute: Type=%d Len=%d",
pos[0], pos[1] * 4);
if (pos + pos[1] * 4 > end) {
wpa_printf(MSG_INFO, "EAP-SIM: Attribute overflow "
"(pos=%p len=%d end=%p)",
pos, pos[1] * 4, end);
return -1;
}
if (pos[1] == 0) {
wpa_printf(MSG_INFO, "EAP-SIM: Attribute underflow");
return -1;
}
apos = pos + 2;
alen = pos[1] * 4 - 2;
wpa_hexdump(MSG_MSGDUMP, "EAP-SIM: Attribute data",
apos, alen);
switch (pos[0]) {
case EAP_SIM_AT_RAND:
wpa_printf(MSG_DEBUG, "EAP-SIM: AT_RAND");
apos += 2;
alen -= 2;
if ((!aka && (alen % GSM_RAND_LEN)) ||
(aka && alen != EAP_AKA_RAND_LEN)) {
wpa_printf(MSG_INFO, "EAP-SIM: Invalid AT_RAND"
" (len %lu)",
(unsigned long) alen);
return -1;
}
attr->rand = apos;
attr->num_chal = alen / GSM_RAND_LEN;
break;
case EAP_SIM_AT_AUTN:
wpa_printf(MSG_DEBUG, "EAP-AKA: AT_AUTN");
if (!aka) {
wpa_printf(MSG_DEBUG, "EAP-SIM: "
"Unexpected AT_AUTN");
return -1;
}
apos += 2;
alen -= 2;
if (alen != EAP_AKA_AUTN_LEN) {
wpa_printf(MSG_INFO, "EAP-AKA: Invalid AT_AUTN"
" (len %lu)",
(unsigned long) alen);
return -1;
}
attr->autn = apos;
break;
case EAP_SIM_AT_PADDING:
if (!encr) {
wpa_printf(MSG_ERROR, "EAP-SIM: Unencrypted "
"AT_PADDING");
return -1;
}
wpa_printf(MSG_DEBUG, "EAP-SIM: (encr) AT_PADDING");
for (i = 2; i < alen; i++) {
if (apos[i] != 0) {
wpa_printf(MSG_INFO, "EAP-SIM: (encr) "
"AT_PADDING used a non-zero"
" padding byte");
wpa_hexdump(MSG_DEBUG, "EAP-SIM: "
"(encr) padding bytes",
apos + 2, alen - 2);
return -1;
}
}
break;
case EAP_SIM_AT_NONCE_MT:
wpa_printf(MSG_DEBUG, "EAP-SIM: AT_NONCE_MT");
if (alen != 2 + EAP_SIM_NONCE_MT_LEN) {
wpa_printf(MSG_INFO, "EAP-SIM: Invalid "
"AT_NONCE_MT length");
return -1;
}
attr->nonce_mt = apos + 2;
break;
case EAP_SIM_AT_PERMANENT_ID_REQ:
wpa_printf(MSG_DEBUG, "EAP-SIM: AT_PERMANENT_ID_REQ");
attr->id_req = PERMANENT_ID;
break;
case EAP_SIM_AT_MAC:
wpa_printf(MSG_DEBUG, "EAP-SIM: AT_MAC");
if (alen != 2 + EAP_SIM_MAC_LEN) {
wpa_printf(MSG_INFO, "EAP-SIM: Invalid AT_MAC "
"length");
return -1;
}
attr->mac = apos + 2;
break;
case EAP_SIM_AT_NOTIFICATION:
if (alen != 2) {
wpa_printf(MSG_INFO, "EAP-SIM: Invalid "
"AT_NOTIFICATION length %lu",
(unsigned long) alen);
return -1;
}
attr->notification = apos[0] * 256 + apos[1];
wpa_printf(MSG_DEBUG, "EAP-SIM: AT_NOTIFICATION %d",
attr->notification);
break;
case EAP_SIM_AT_ANY_ID_REQ:
wpa_printf(MSG_DEBUG, "EAP-SIM: AT_ANY_ID_REQ");
attr->id_req = ANY_ID;
break;
case EAP_SIM_AT_IDENTITY:
wpa_printf(MSG_DEBUG, "EAP-SIM: AT_IDENTITY");
plen = WPA_GET_BE16(apos);
apos += 2;
alen -= 2;
if (plen > alen) {
wpa_printf(MSG_INFO, "EAP-SIM: Invalid "
"AT_IDENTITY (Actual Length %lu, "
"remaining length %lu)",
(unsigned long) plen,
(unsigned long) alen);
return -1;
}
attr->identity = apos;
attr->identity_len = plen;
break;
case EAP_SIM_AT_VERSION_LIST:
if (aka) {
wpa_printf(MSG_DEBUG, "EAP-AKA: "
"Unexpected AT_VERSION_LIST");
return -1;
}
list_len = apos[0] * 256 + apos[1];
wpa_printf(MSG_DEBUG, "EAP-SIM: AT_VERSION_LIST");
if (list_len < 2 || list_len > alen - 2) {
wpa_printf(MSG_WARNING, "EAP-SIM: Invalid "
"AT_VERSION_LIST (list_len=%lu "
"attr_len=%lu)",
(unsigned long) list_len,
(unsigned long) alen);
return -1;
}
attr->version_list = apos + 2;
attr->version_list_len = list_len;
break;
case EAP_SIM_AT_SELECTED_VERSION:
wpa_printf(MSG_DEBUG, "EAP-SIM: AT_SELECTED_VERSION");
if (alen != 2) {
wpa_printf(MSG_INFO, "EAP-SIM: Invalid "
"AT_SELECTED_VERSION length %lu",
(unsigned long) alen);
return -1;
}
attr->selected_version = apos[0] * 256 + apos[1];
wpa_printf(MSG_DEBUG, "EAP-SIM: AT_SELECTED_VERSION "
"%d", attr->selected_version);
break;
case EAP_SIM_AT_FULLAUTH_ID_REQ:
wpa_printf(MSG_DEBUG, "EAP-SIM: AT_FULLAUTH_ID_REQ");
attr->id_req = FULLAUTH_ID;
break;
case EAP_SIM_AT_COUNTER:
if (!encr) {
wpa_printf(MSG_ERROR, "EAP-SIM: Unencrypted "
"AT_COUNTER");
return -1;
}
if (alen != 2) {
wpa_printf(MSG_INFO, "EAP-SIM: (encr) Invalid "
"AT_COUNTER (alen=%lu)",
(unsigned long) alen);
return -1;
}
attr->counter = apos[0] * 256 + apos[1];
wpa_printf(MSG_DEBUG, "EAP-SIM: (encr) AT_COUNTER %d",
attr->counter);
break;
case EAP_SIM_AT_COUNTER_TOO_SMALL:
if (!encr) {
wpa_printf(MSG_ERROR, "EAP-SIM: Unencrypted "
"AT_COUNTER_TOO_SMALL");
return -1;
}
if (alen != 2) {
wpa_printf(MSG_INFO, "EAP-SIM: (encr) Invalid "
"AT_COUNTER_TOO_SMALL (alen=%lu)",
(unsigned long) alen);
return -1;
}
wpa_printf(MSG_DEBUG, "EAP-SIM: (encr) "
"AT_COUNTER_TOO_SMALL");
attr->counter_too_small = 1;
break;
case EAP_SIM_AT_NONCE_S:
if (!encr) {
wpa_printf(MSG_ERROR, "EAP-SIM: Unencrypted "
"AT_NONCE_S");
return -1;
}
wpa_printf(MSG_DEBUG, "EAP-SIM: (encr) "
"AT_NONCE_S");
if (alen != 2 + EAP_SIM_NONCE_S_LEN) {
wpa_printf(MSG_INFO, "EAP-SIM: (encr) Invalid "
"AT_NONCE_S (alen=%lu)",
(unsigned long) alen);
return -1;
}
attr->nonce_s = apos + 2;
break;
case EAP_SIM_AT_CLIENT_ERROR_CODE:
if (alen != 2) {
wpa_printf(MSG_INFO, "EAP-SIM: Invalid "
"AT_CLIENT_ERROR_CODE length %lu",
(unsigned long) alen);
return -1;
}
attr->client_error_code = apos[0] * 256 + apos[1];
wpa_printf(MSG_DEBUG, "EAP-SIM: AT_CLIENT_ERROR_CODE "
"%d", attr->client_error_code);
break;
case EAP_SIM_AT_IV:
wpa_printf(MSG_DEBUG, "EAP-SIM: AT_IV");
if (alen != 2 + EAP_SIM_MAC_LEN) {
wpa_printf(MSG_INFO, "EAP-SIM: Invalid AT_IV "
"length %lu", (unsigned long) alen);
return -1;
}
attr->iv = apos + 2;
break;
case EAP_SIM_AT_ENCR_DATA:
wpa_printf(MSG_DEBUG, "EAP-SIM: AT_ENCR_DATA");
attr->encr_data = apos + 2;
attr->encr_data_len = alen - 2;
if (attr->encr_data_len % 16) {
wpa_printf(MSG_INFO, "EAP-SIM: Invalid "
"AT_ENCR_DATA length %lu",
(unsigned long)
attr->encr_data_len);
return -1;
}
break;
case EAP_SIM_AT_NEXT_PSEUDONYM:
if (!encr) {
wpa_printf(MSG_ERROR, "EAP-SIM: Unencrypted "
"AT_NEXT_PSEUDONYM");
return -1;
}
wpa_printf(MSG_DEBUG, "EAP-SIM: (encr) "
"AT_NEXT_PSEUDONYM");
plen = apos[0] * 256 + apos[1];
if (plen > alen - 2) {
wpa_printf(MSG_INFO, "EAP-SIM: (encr) Invalid"
" AT_NEXT_PSEUDONYM (actual"
" len %lu, attr len %lu)",
(unsigned long) plen,
(unsigned long) alen);
return -1;
}
attr->next_pseudonym = pos + 4;
attr->next_pseudonym_len = plen;
break;
case EAP_SIM_AT_NEXT_REAUTH_ID:
if (!encr) {
wpa_printf(MSG_ERROR, "EAP-SIM: Unencrypted "
"AT_NEXT_REAUTH_ID");
return -1;
}
wpa_printf(MSG_DEBUG, "EAP-SIM: (encr) "
"AT_NEXT_REAUTH_ID");
plen = apos[0] * 256 + apos[1];
if (plen > alen - 2) {
wpa_printf(MSG_INFO, "EAP-SIM: (encr) Invalid"
" AT_NEXT_REAUTH_ID (actual"
" len %lu, attr len %lu)",
(unsigned long) plen,
(unsigned long) alen);
return -1;
}
attr->next_reauth_id = pos + 4;
attr->next_reauth_id_len = plen;
break;
case EAP_SIM_AT_RES:
wpa_printf(MSG_DEBUG, "EAP-SIM: AT_RES");
attr->res_len_bits = WPA_GET_BE16(apos);
apos += 2;
alen -= 2;
if (!aka || alen < EAP_AKA_MIN_RES_LEN ||
alen > EAP_AKA_MAX_RES_LEN) {
wpa_printf(MSG_INFO, "EAP-SIM: Invalid AT_RES "
"(len %lu)",
(unsigned long) alen);
return -1;
}
attr->res = apos;
attr->res_len = alen;
break;
case EAP_SIM_AT_AUTS:
wpa_printf(MSG_DEBUG, "EAP-AKA: AT_AUTS");
if (!aka) {
wpa_printf(MSG_DEBUG, "EAP-SIM: "
"Unexpected AT_AUTS");
return -1;
}
if (alen != EAP_AKA_AUTS_LEN) {
wpa_printf(MSG_INFO, "EAP-AKA: Invalid AT_AUTS"
" (len %lu)",
(unsigned long) alen);
return -1;
}
attr->auts = apos;
break;
case EAP_SIM_AT_CHECKCODE:
wpa_printf(MSG_DEBUG, "EAP-AKA: AT_CHECKCODE");
if (!aka) {
wpa_printf(MSG_DEBUG, "EAP-SIM: "
"Unexpected AT_CHECKCODE");
return -1;
}
apos += 2;
alen -= 2;
if (alen != 0 && alen != EAP_AKA_CHECKCODE_LEN &&
alen != EAP_AKA_PRIME_CHECKCODE_LEN) {
wpa_printf(MSG_INFO, "EAP-AKA: Invalid "
"AT_CHECKCODE (len %lu)",
(unsigned long) alen);
return -1;
}
attr->checkcode = apos;
attr->checkcode_len = alen;
break;
case EAP_SIM_AT_RESULT_IND:
if (encr) {
wpa_printf(MSG_ERROR, "EAP-SIM: Encrypted "
"AT_RESULT_IND");
return -1;
}
if (alen != 2) {
wpa_printf(MSG_INFO, "EAP-SIM: Invalid "
"AT_RESULT_IND (alen=%lu)",
(unsigned long) alen);
return -1;
}
wpa_printf(MSG_DEBUG, "EAP-SIM: AT_RESULT_IND");
attr->result_ind = 1;
break;
#if defined(EAP_AKA_PRIME) || defined(EAP_SERVER_AKA_PRIME)
case EAP_SIM_AT_KDF_INPUT:
if (aka != 2) {
wpa_printf(MSG_INFO, "EAP-AKA: Unexpected "
"AT_KDF_INPUT");
return -1;
}
wpa_printf(MSG_DEBUG, "EAP-AKA: AT_KDF_INPUT");
plen = WPA_GET_BE16(apos);
apos += 2;
alen -= 2;
if (plen > alen) {
wpa_printf(MSG_INFO, "EAP-AKA': Invalid "
"AT_KDF_INPUT (Actual Length %lu, "
"remaining length %lu)",
(unsigned long) plen,
(unsigned long) alen);
return -1;
}
attr->kdf_input = apos;
attr->kdf_input_len = plen;
break;
case EAP_SIM_AT_KDF:
if (aka != 2) {
wpa_printf(MSG_INFO, "EAP-AKA: Unexpected "
"AT_KDF");
return -1;
}
wpa_printf(MSG_DEBUG, "EAP-AKA: AT_KDF");
if (alen != 2) {
wpa_printf(MSG_INFO, "EAP-AKA': Invalid "
"AT_KDF (len %lu)",
(unsigned long) alen);
return -1;
}
if (attr->kdf_count == EAP_AKA_PRIME_KDF_MAX) {
wpa_printf(MSG_DEBUG, "EAP-AKA': Too many "
"AT_KDF attributes - ignore this");
break;
}
attr->kdf[attr->kdf_count] = WPA_GET_BE16(apos);
attr->kdf_count++;
break;
case EAP_SIM_AT_BIDDING:
wpa_printf(MSG_DEBUG, "EAP-AKA: AT_BIDDING");
if (alen != 2) {
wpa_printf(MSG_INFO, "EAP-AKA: Invalid "
"AT_BIDDING (len %lu)",
(unsigned long) alen);
return -1;
}
attr->bidding = apos;
break;
#endif /* EAP_AKA_PRIME || EAP_SERVER_AKA_PRIME */
default:
if (pos[0] < 128) {
wpa_printf(MSG_INFO, "EAP-SIM: Unrecognized "
"non-skippable attribute %d",
pos[0]);
return -1;
}
wpa_printf(MSG_DEBUG, "EAP-SIM: Unrecognized skippable"
" attribute %d ignored", pos[0]);
break;
}
pos += pos[1] * 4;
}
wpa_printf(MSG_DEBUG, "EAP-SIM: Attributes parsed successfully "
"(aka=%d encr=%d)", aka, encr);
return 0;
}
u8 * eap_sim_parse_encr(const u8 *k_encr, const u8 *encr_data,
size_t encr_data_len, const u8 *iv,
struct eap_sim_attrs *attr, int aka)
{
u8 *decrypted;
if (!iv) {
wpa_printf(MSG_INFO, "EAP-SIM: Encrypted data, but no IV");
return NULL;
}
decrypted = os_malloc(encr_data_len);
if (decrypted == NULL)
return NULL;
os_memcpy(decrypted, encr_data, encr_data_len);
if (aes_128_cbc_decrypt(k_encr, iv, decrypted, encr_data_len)) {
os_free(decrypted);
return NULL;
}
wpa_hexdump(MSG_MSGDUMP, "EAP-SIM: Decrypted AT_ENCR_DATA",
decrypted, encr_data_len);
if (eap_sim_parse_attr(decrypted, decrypted + encr_data_len, attr,
aka, 1)) {
wpa_printf(MSG_INFO, "EAP-SIM: (encr) Failed to parse "
"decrypted AT_ENCR_DATA");
os_free(decrypted);
return NULL;
}
return decrypted;
}
#define EAP_SIM_INIT_LEN 128
struct eap_sim_msg {
struct wpabuf *buf;
size_t mac, iv, encr; /* index from buf */
};
struct eap_sim_msg * eap_sim_msg_init(int code, int id, int type, int subtype)
{
struct eap_sim_msg *msg;
struct eap_hdr *eap;
u8 *pos;
msg = os_zalloc(sizeof(*msg));
if (msg == NULL)
return NULL;
msg->buf = wpabuf_alloc(EAP_SIM_INIT_LEN);
if (msg->buf == NULL) {
os_free(msg);
return NULL;
}
eap = wpabuf_put(msg->buf, sizeof(*eap));
eap->code = code;
eap->identifier = id;
pos = wpabuf_put(msg->buf, 4);
*pos++ = type;
*pos++ = subtype;
*pos++ = 0; /* Reserved */
*pos++ = 0; /* Reserved */
return msg;
}
struct wpabuf * eap_sim_msg_finish(struct eap_sim_msg *msg, int type,
const u8 *k_aut,
const u8 *extra, size_t extra_len)
{
struct eap_hdr *eap;
struct wpabuf *buf;
if (msg == NULL)
return NULL;
eap = wpabuf_mhead(msg->buf);
eap->length = host_to_be16(wpabuf_len(msg->buf));
#if defined(EAP_AKA_PRIME) || defined(EAP_SERVER_AKA_PRIME)
if (k_aut && msg->mac && type == EAP_TYPE_AKA_PRIME) {
eap_sim_add_mac_sha256(k_aut, (u8 *) wpabuf_head(msg->buf),
wpabuf_len(msg->buf),
(u8 *) wpabuf_mhead(msg->buf) +
msg->mac, extra, extra_len);
} else
#endif /* EAP_AKA_PRIME || EAP_SERVER_AKA_PRIME */
if (k_aut && msg->mac) {
eap_sim_add_mac(k_aut, (u8 *) wpabuf_head(msg->buf),
wpabuf_len(msg->buf),
(u8 *) wpabuf_mhead(msg->buf) + msg->mac,
extra, extra_len);
}
buf = msg->buf;
os_free(msg);
return buf;
}
void eap_sim_msg_free(struct eap_sim_msg *msg)
{
if (msg) {
wpabuf_free(msg->buf);
os_free(msg);
}
}
u8 * eap_sim_msg_add_full(struct eap_sim_msg *msg, u8 attr,
const u8 *data, size_t len)
{
int attr_len = 2 + len;
int pad_len;
u8 *start;
if (msg == NULL)
return NULL;
pad_len = (4 - attr_len % 4) % 4;
attr_len += pad_len;
if (wpabuf_resize(&msg->buf, attr_len))
return NULL;
start = wpabuf_put(msg->buf, 0);
wpabuf_put_u8(msg->buf, attr);
wpabuf_put_u8(msg->buf, attr_len / 4);
wpabuf_put_data(msg->buf, data, len);
if (pad_len)
os_memset(wpabuf_put(msg->buf, pad_len), 0, pad_len);
return start;
}
u8 * eap_sim_msg_add(struct eap_sim_msg *msg, u8 attr, u16 value,
const u8 *data, size_t len)
{
int attr_len = 4 + len;
int pad_len;
u8 *start;
if (msg == NULL)
return NULL;
pad_len = (4 - attr_len % 4) % 4;
attr_len += pad_len;
if (wpabuf_resize(&msg->buf, attr_len))
return NULL;
start = wpabuf_put(msg->buf, 0);
wpabuf_put_u8(msg->buf, attr);
wpabuf_put_u8(msg->buf, attr_len / 4);
wpabuf_put_be16(msg->buf, value);
if (data)
wpabuf_put_data(msg->buf, data, len);
else
wpabuf_put(msg->buf, len);
if (pad_len)
os_memset(wpabuf_put(msg->buf, pad_len), 0, pad_len);
return start;
}
u8 * eap_sim_msg_add_mac(struct eap_sim_msg *msg, u8 attr)
{
u8 *pos = eap_sim_msg_add(msg, attr, 0, NULL, EAP_SIM_MAC_LEN);
if (pos)
msg->mac = (pos - wpabuf_head_u8(msg->buf)) + 4;
return pos;
}
int eap_sim_msg_add_encr_start(struct eap_sim_msg *msg, u8 attr_iv,
u8 attr_encr)
{
u8 *pos = eap_sim_msg_add(msg, attr_iv, 0, NULL, EAP_SIM_IV_LEN);
if (pos == NULL)
return -1;
msg->iv = (pos - wpabuf_head_u8(msg->buf)) + 4;
if (random_get_bytes(wpabuf_mhead_u8(msg->buf) + msg->iv,
EAP_SIM_IV_LEN)) {
msg->iv = 0;
return -1;
}
pos = eap_sim_msg_add(msg, attr_encr, 0, NULL, 0);
if (pos == NULL) {
msg->iv = 0;
return -1;
}
msg->encr = pos - wpabuf_head_u8(msg->buf);
return 0;
}
int eap_sim_msg_add_encr_end(struct eap_sim_msg *msg, u8 *k_encr, int attr_pad)
{
size_t encr_len;
if (msg == NULL || k_encr == NULL || msg->iv == 0 || msg->encr == 0)
return -1;
encr_len = wpabuf_len(msg->buf) - msg->encr - 4;
if (encr_len % 16) {
u8 *pos;
int pad_len = 16 - (encr_len % 16);
if (pad_len < 4) {
wpa_printf(MSG_WARNING, "EAP-SIM: "
"eap_sim_msg_add_encr_end - invalid pad_len"
" %d", pad_len);
return -1;
}
wpa_printf(MSG_DEBUG, " *AT_PADDING");
pos = eap_sim_msg_add(msg, attr_pad, 0, NULL, pad_len - 4);
if (pos == NULL)
return -1;
os_memset(pos + 4, 0, pad_len - 4);
encr_len += pad_len;
}
wpa_printf(MSG_DEBUG, " (AT_ENCR_DATA data len %lu)",
(unsigned long) encr_len);
wpabuf_mhead_u8(msg->buf)[msg->encr + 1] = encr_len / 4 + 1;
return aes_128_cbc_encrypt(k_encr, wpabuf_head_u8(msg->buf) + msg->iv,
wpabuf_mhead_u8(msg->buf) + msg->encr + 4,
encr_len);
}
void eap_sim_report_notification(void *msg_ctx, int notification, int aka)
{
#ifndef CONFIG_NO_STDOUT_DEBUG
const char *type = aka ? "AKA" : "SIM";
#endif /* CONFIG_NO_STDOUT_DEBUG */
switch (notification) {
case EAP_SIM_GENERAL_FAILURE_AFTER_AUTH:
wpa_printf(MSG_WARNING, "EAP-%s: General failure "
"notification (after authentication)", type);
break;
case EAP_SIM_TEMPORARILY_DENIED:
wpa_printf(MSG_WARNING, "EAP-%s: Failure notification: "
"User has been temporarily denied access to the "
"requested service", type);
break;
case EAP_SIM_NOT_SUBSCRIBED:
wpa_printf(MSG_WARNING, "EAP-%s: Failure notification: "
"User has not subscribed to the requested service",
type);
break;
case EAP_SIM_GENERAL_FAILURE_BEFORE_AUTH:
wpa_printf(MSG_WARNING, "EAP-%s: General failure "
"notification (before authentication)", type);
break;
case EAP_SIM_SUCCESS:
wpa_printf(MSG_INFO, "EAP-%s: Successful authentication "
"notification", type);
break;
default:
if (notification >= 32768) {
wpa_printf(MSG_INFO, "EAP-%s: Unrecognized "
"non-failure notification %d",
type, notification);
} else {
wpa_printf(MSG_WARNING, "EAP-%s: Unrecognized "
"failure notification %d",
type, notification);
}
}
}