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/*
* EAP peer: EAP-SIM/AKA shared routines
* Copyright (c) 2004-2008, Jouni Malinen <j@w1.fi>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* Alternatively, this software may be distributed under the terms of BSD
* license.
*
* See README and COPYING for more details.
*/

#include "includes.h"

#include "common.h"
#include "eap_i.h"
#include "sha1.h"
#include "crypto.h"
#include "aes_wrap.h"
#include "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 u8 *req, size_t req_len,
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 || req_len < EAP_SIM_MAC_LEN || mac < req ||
mac > req + req_len - EAP_SIM_MAC_LEN)
return -1;

tmp = os_malloc(req_len);
if (tmp == NULL)
return -1;

addr[0] = tmp;
len[0] = req_len;
addr[1] = extra;
len[1] = extra_len;

/* HMAC-SHA1-128 */
os_memcpy(tmp, req, req_len);
os_memset(tmp + (mac - req), 0, EAP_SIM_MAC_LEN);
wpa_hexdump(MSG_MSGDUMP, "EAP-SIM: Verify MAC - msg", tmp, req_len);
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(hmac, mac, EAP_SIM_MAC_LEN) == 0) ? 0 : 1;
}


void eap_sim_add_mac(const u8 *k_aut, 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);
}


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");
attr->identity = apos + 2;
attr->identity_len = alen - 2;
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");
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;
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);

aes_128_cbc_decrypt(k_encr, iv, decrypted, encr_data_len);
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 {
u8 *buf;
size_t buf_len, used;
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 = os_zalloc(EAP_SIM_INIT_LEN);
if (msg->buf == NULL) {
os_free(msg);
return NULL;
}
msg->buf_len = EAP_SIM_INIT_LEN;
eap = (struct eap_hdr *) msg->buf;
eap->code = code;
eap->identifier = id;
msg->used = sizeof(*eap);

pos = (u8 *) (eap + 1);
*pos++ = type;
*pos++ = subtype;
*pos++ = 0; /* Reserved */
*pos++ = 0; /* Reserved */
msg->used += 4;

return msg;
}


u8 * eap_sim_msg_finish(struct eap_sim_msg *msg, size_t *len, const u8 *k_aut,
const u8 *extra, size_t extra_len)
{
struct eap_hdr *eap;
u8 *buf;

if (msg == NULL)
return NULL;

eap = (struct eap_hdr *) msg->buf;
eap->length = host_to_be16(msg->used);

if (k_aut && msg->mac) {
eap_sim_add_mac(k_aut, msg->buf, msg->used,
msg->buf + msg->mac, extra, extra_len);
}

*len = msg->used;
buf = msg->buf;
os_free(msg);
return buf;
}


void eap_sim_msg_free(struct eap_sim_msg *msg)
{
if (msg) {
os_free(msg->buf);
os_free(msg);
}
}


static int eap_sim_msg_resize(struct eap_sim_msg *msg, size_t add_len)
{
if (msg->used + add_len > msg->buf_len) {
u8 *nbuf = os_realloc(msg->buf, msg->used + add_len);
if (nbuf == NULL)
return -1;
msg->buf = nbuf;
msg->buf_len = msg->used + add_len;
}
return 0;
}


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, *pos;

if (msg == NULL)
return NULL;

pad_len = (4 - attr_len % 4) % 4;
attr_len += pad_len;
if (eap_sim_msg_resize(msg, attr_len))
return NULL;
start = pos = msg->buf + msg->used;
*pos++ = attr;
*pos++ = attr_len / 4;
os_memcpy(pos, data, len);
if (pad_len) {
pos += len;
os_memset(pos, 0, pad_len);
}
msg->used += attr_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, *pos;

if (msg == NULL)
return NULL;

pad_len = (4 - attr_len % 4) % 4;
attr_len += pad_len;
if (eap_sim_msg_resize(msg, attr_len))
return NULL;
start = pos = msg->buf + msg->used;
*pos++ = attr;
*pos++ = attr_len / 4;
WPA_PUT_BE16(pos, value);
pos += 2;
if (data)
os_memcpy(pos, data, len);
if (pad_len) {
pos += len;
os_memset(pos, 0, pad_len);
}
msg->used += attr_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 - 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 - msg->buf) + 4;
if (hostapd_get_rand(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 - 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 = msg->used - 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);
msg->buf[msg->encr + 1] = encr_len / 4 + 1;
aes_128_cbc_encrypt(k_encr, msg->buf + msg->iv,
msg->buf + msg->encr + 4, encr_len);

return 0;
}


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);
}
}
}
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