Line data Source code
1 : /*
2 : * EAP peer/server: EAP-SIM/AKA/AKA' shared routines
3 : * Copyright (c) 2004-2008, Jouni Malinen <j@w1.fi>
4 : *
5 : * This software may be distributed under the terms of the BSD license.
6 : * See README for more details.
7 : */
8 :
9 : #include "includes.h"
10 :
11 : #include "common.h"
12 : #include "wpabuf.h"
13 : #include "crypto/aes_wrap.h"
14 : #include "crypto/crypto.h"
15 : #include "crypto/sha1.h"
16 : #include "crypto/sha256.h"
17 : #include "crypto/random.h"
18 : #include "eap_common/eap_defs.h"
19 : #include "eap_common/eap_sim_common.h"
20 :
21 :
22 145 : static int eap_sim_prf(const u8 *key, u8 *x, size_t xlen)
23 : {
24 145 : return fips186_2_prf(key, EAP_SIM_MK_LEN, x, xlen);
25 : }
26 :
27 :
28 54 : void eap_sim_derive_mk(const u8 *identity, size_t identity_len,
29 : const u8 *nonce_mt, u16 selected_version,
30 : const u8 *ver_list, size_t ver_list_len,
31 : int num_chal, const u8 *kc, u8 *mk)
32 : {
33 : u8 sel_ver[2];
34 : const unsigned char *addr[5];
35 : size_t len[5];
36 :
37 54 : addr[0] = identity;
38 54 : len[0] = identity_len;
39 54 : addr[1] = kc;
40 54 : len[1] = num_chal * EAP_SIM_KC_LEN;
41 54 : addr[2] = nonce_mt;
42 54 : len[2] = EAP_SIM_NONCE_MT_LEN;
43 54 : addr[3] = ver_list;
44 54 : len[3] = ver_list_len;
45 54 : addr[4] = sel_ver;
46 54 : len[4] = 2;
47 :
48 54 : WPA_PUT_BE16(sel_ver, selected_version);
49 :
50 : /* MK = SHA1(Identity|n*Kc|NONCE_MT|Version List|Selected Version) */
51 54 : sha1_vector(5, addr, len, mk);
52 54 : wpa_hexdump_key(MSG_DEBUG, "EAP-SIM: MK", mk, EAP_SIM_MK_LEN);
53 54 : }
54 :
55 :
56 53 : void eap_aka_derive_mk(const u8 *identity, size_t identity_len,
57 : const u8 *ik, const u8 *ck, u8 *mk)
58 : {
59 : const u8 *addr[3];
60 : size_t len[3];
61 :
62 53 : addr[0] = identity;
63 53 : len[0] = identity_len;
64 53 : addr[1] = ik;
65 53 : len[1] = EAP_AKA_IK_LEN;
66 53 : addr[2] = ck;
67 53 : len[2] = EAP_AKA_CK_LEN;
68 :
69 : /* MK = SHA1(Identity|IK|CK) */
70 53 : sha1_vector(3, addr, len, mk);
71 53 : wpa_hexdump_key(MSG_DEBUG, "EAP-AKA: IK", ik, EAP_AKA_IK_LEN);
72 53 : wpa_hexdump_key(MSG_DEBUG, "EAP-AKA: CK", ck, EAP_AKA_CK_LEN);
73 53 : wpa_hexdump_key(MSG_DEBUG, "EAP-AKA: MK", mk, EAP_SIM_MK_LEN);
74 53 : }
75 :
76 :
77 121 : int eap_sim_derive_keys(const u8 *mk, u8 *k_encr, u8 *k_aut, u8 *msk, u8 *emsk)
78 : {
79 : u8 buf[EAP_SIM_K_ENCR_LEN + EAP_SIM_K_AUT_LEN +
80 : EAP_SIM_KEYING_DATA_LEN + EAP_EMSK_LEN], *pos;
81 121 : if (eap_sim_prf(mk, buf, sizeof(buf)) < 0) {
82 0 : wpa_printf(MSG_ERROR, "EAP-SIM: Failed to derive keys");
83 0 : return -1;
84 : }
85 121 : pos = buf;
86 121 : os_memcpy(k_encr, pos, EAP_SIM_K_ENCR_LEN);
87 121 : pos += EAP_SIM_K_ENCR_LEN;
88 121 : os_memcpy(k_aut, pos, EAP_SIM_K_AUT_LEN);
89 121 : pos += EAP_SIM_K_AUT_LEN;
90 121 : os_memcpy(msk, pos, EAP_SIM_KEYING_DATA_LEN);
91 121 : pos += EAP_SIM_KEYING_DATA_LEN;
92 121 : os_memcpy(emsk, pos, EAP_EMSK_LEN);
93 :
94 121 : wpa_hexdump_key(MSG_DEBUG, "EAP-SIM: K_encr",
95 : k_encr, EAP_SIM_K_ENCR_LEN);
96 121 : wpa_hexdump_key(MSG_DEBUG, "EAP-SIM: K_aut",
97 : k_aut, EAP_SIM_K_AUT_LEN);
98 121 : wpa_hexdump_key(MSG_DEBUG, "EAP-SIM: keying material (MSK)",
99 : msk, EAP_SIM_KEYING_DATA_LEN);
100 121 : wpa_hexdump_key(MSG_DEBUG, "EAP-SIM: EMSK", emsk, EAP_EMSK_LEN);
101 121 : os_memset(buf, 0, sizeof(buf));
102 :
103 121 : return 0;
104 : }
105 :
106 :
107 24 : int eap_sim_derive_keys_reauth(u16 _counter,
108 : const u8 *identity, size_t identity_len,
109 : const u8 *nonce_s, const u8 *mk, u8 *msk,
110 : u8 *emsk)
111 : {
112 : u8 xkey[SHA1_MAC_LEN];
113 : u8 buf[EAP_SIM_KEYING_DATA_LEN + EAP_EMSK_LEN + 32];
114 : u8 counter[2];
115 : const u8 *addr[4];
116 : size_t len[4];
117 :
118 48 : while (identity_len > 0 && identity[identity_len - 1] == 0) {
119 0 : wpa_printf(MSG_DEBUG, "EAP-SIM: Workaround - drop null "
120 : "character from the end of identity");
121 0 : identity_len--;
122 : }
123 24 : addr[0] = identity;
124 24 : len[0] = identity_len;
125 24 : addr[1] = counter;
126 24 : len[1] = 2;
127 24 : addr[2] = nonce_s;
128 24 : len[2] = EAP_SIM_NONCE_S_LEN;
129 24 : addr[3] = mk;
130 24 : len[3] = EAP_SIM_MK_LEN;
131 :
132 24 : WPA_PUT_BE16(counter, _counter);
133 :
134 24 : wpa_printf(MSG_DEBUG, "EAP-SIM: Deriving keying data from reauth");
135 24 : wpa_hexdump_ascii(MSG_DEBUG, "EAP-SIM: Identity",
136 : identity, identity_len);
137 24 : wpa_hexdump(MSG_DEBUG, "EAP-SIM: counter", counter, 2);
138 24 : wpa_hexdump(MSG_DEBUG, "EAP-SIM: NONCE_S", nonce_s,
139 : EAP_SIM_NONCE_S_LEN);
140 24 : wpa_hexdump_key(MSG_DEBUG, "EAP-SIM: MK", mk, EAP_SIM_MK_LEN);
141 :
142 : /* XKEY' = SHA1(Identity|counter|NONCE_S|MK) */
143 24 : sha1_vector(4, addr, len, xkey);
144 24 : wpa_hexdump(MSG_DEBUG, "EAP-SIM: XKEY'", xkey, SHA1_MAC_LEN);
145 :
146 24 : if (eap_sim_prf(xkey, buf, sizeof(buf)) < 0) {
147 0 : wpa_printf(MSG_ERROR, "EAP-SIM: Failed to derive keys");
148 0 : return -1;
149 : }
150 24 : if (msk) {
151 24 : os_memcpy(msk, buf, EAP_SIM_KEYING_DATA_LEN);
152 24 : wpa_hexdump(MSG_DEBUG, "EAP-SIM: keying material (MSK)",
153 : msk, EAP_SIM_KEYING_DATA_LEN);
154 : }
155 24 : if (emsk) {
156 24 : os_memcpy(emsk, buf + EAP_SIM_KEYING_DATA_LEN, EAP_EMSK_LEN);
157 24 : wpa_hexdump(MSG_DEBUG, "EAP-SIM: EMSK", emsk, EAP_EMSK_LEN);
158 : }
159 24 : os_memset(buf, 0, sizeof(buf));
160 :
161 24 : return 0;
162 : }
163 :
164 :
165 106 : int eap_sim_verify_mac(const u8 *k_aut, const struct wpabuf *req,
166 : const u8 *mac, const u8 *extra, size_t extra_len)
167 : {
168 : unsigned char hmac[SHA1_MAC_LEN];
169 : const u8 *addr[2];
170 : size_t len[2];
171 : u8 *tmp;
172 :
173 212 : if (mac == NULL || wpabuf_len(req) < EAP_SIM_MAC_LEN ||
174 212 : mac < wpabuf_head_u8(req) ||
175 106 : mac > wpabuf_head_u8(req) + wpabuf_len(req) - EAP_SIM_MAC_LEN)
176 0 : return -1;
177 :
178 106 : tmp = os_malloc(wpabuf_len(req));
179 106 : if (tmp == NULL)
180 0 : return -1;
181 :
182 106 : addr[0] = tmp;
183 106 : len[0] = wpabuf_len(req);
184 106 : addr[1] = extra;
185 106 : len[1] = extra_len;
186 :
187 : /* HMAC-SHA1-128 */
188 106 : os_memcpy(tmp, wpabuf_head(req), wpabuf_len(req));
189 106 : os_memset(tmp + (mac - wpabuf_head_u8(req)), 0, EAP_SIM_MAC_LEN);
190 106 : wpa_hexdump(MSG_MSGDUMP, "EAP-SIM: Verify MAC - msg",
191 : tmp, wpabuf_len(req));
192 106 : wpa_hexdump(MSG_MSGDUMP, "EAP-SIM: Verify MAC - extra data",
193 : extra, extra_len);
194 106 : wpa_hexdump_key(MSG_MSGDUMP, "EAP-SIM: Verify MAC - K_aut",
195 : k_aut, EAP_SIM_K_AUT_LEN);
196 106 : hmac_sha1_vector(k_aut, EAP_SIM_K_AUT_LEN, 2, addr, len, hmac);
197 106 : wpa_hexdump(MSG_MSGDUMP, "EAP-SIM: Verify MAC: MAC",
198 : hmac, EAP_SIM_MAC_LEN);
199 106 : os_free(tmp);
200 :
201 106 : return (os_memcmp_const(hmac, mac, EAP_SIM_MAC_LEN) == 0) ? 0 : 1;
202 : }
203 :
204 :
205 140 : void eap_sim_add_mac(const u8 *k_aut, const u8 *msg, size_t msg_len, u8 *mac,
206 : const u8 *extra, size_t extra_len)
207 : {
208 : unsigned char hmac[SHA1_MAC_LEN];
209 : const u8 *addr[2];
210 : size_t len[2];
211 :
212 140 : addr[0] = msg;
213 140 : len[0] = msg_len;
214 140 : addr[1] = extra;
215 140 : len[1] = extra_len;
216 :
217 : /* HMAC-SHA1-128 */
218 140 : os_memset(mac, 0, EAP_SIM_MAC_LEN);
219 140 : wpa_hexdump(MSG_MSGDUMP, "EAP-SIM: Add MAC - msg", msg, msg_len);
220 140 : wpa_hexdump(MSG_MSGDUMP, "EAP-SIM: Add MAC - extra data",
221 : extra, extra_len);
222 140 : wpa_hexdump_key(MSG_MSGDUMP, "EAP-SIM: Add MAC - K_aut",
223 : k_aut, EAP_SIM_K_AUT_LEN);
224 140 : hmac_sha1_vector(k_aut, EAP_SIM_K_AUT_LEN, 2, addr, len, hmac);
225 140 : os_memcpy(mac, hmac, EAP_SIM_MAC_LEN);
226 140 : wpa_hexdump(MSG_MSGDUMP, "EAP-SIM: Add MAC: MAC",
227 : mac, EAP_SIM_MAC_LEN);
228 140 : }
229 :
230 :
231 : #if defined(EAP_AKA_PRIME) || defined(EAP_SERVER_AKA_PRIME)
232 39 : static void prf_prime(const u8 *k, const char *seed1,
233 : const u8 *seed2, size_t seed2_len,
234 : const u8 *seed3, size_t seed3_len,
235 : u8 *res, size_t res_len)
236 : {
237 : const u8 *addr[5];
238 : size_t len[5];
239 : u8 hash[SHA256_MAC_LEN];
240 : u8 iter;
241 :
242 : /*
243 : * PRF'(K,S) = T1 | T2 | T3 | T4 | ...
244 : * T1 = HMAC-SHA-256 (K, S | 0x01)
245 : * T2 = HMAC-SHA-256 (K, T1 | S | 0x02)
246 : * T3 = HMAC-SHA-256 (K, T2 | S | 0x03)
247 : * T4 = HMAC-SHA-256 (K, T3 | S | 0x04)
248 : * ...
249 : */
250 :
251 39 : addr[0] = hash;
252 39 : len[0] = 0;
253 39 : addr[1] = (const u8 *) seed1;
254 39 : len[1] = os_strlen(seed1);
255 39 : addr[2] = seed2;
256 39 : len[2] = seed2_len;
257 39 : addr[3] = seed3;
258 39 : len[3] = seed3_len;
259 39 : addr[4] = &iter;
260 39 : len[4] = 1;
261 :
262 39 : iter = 0;
263 315 : while (res_len) {
264 : size_t hlen;
265 237 : iter++;
266 237 : hmac_sha256_vector(k, 32, 5, addr, len, hash);
267 237 : len[0] = SHA256_MAC_LEN;
268 237 : hlen = res_len > SHA256_MAC_LEN ? SHA256_MAC_LEN : res_len;
269 237 : os_memcpy(res, hash, hlen);
270 237 : res += hlen;
271 237 : res_len -= hlen;
272 : }
273 39 : }
274 :
275 :
276 27 : void eap_aka_prime_derive_keys(const u8 *identity, size_t identity_len,
277 : const u8 *ik, const u8 *ck, u8 *k_encr,
278 : u8 *k_aut, u8 *k_re, u8 *msk, u8 *emsk)
279 : {
280 : u8 key[EAP_AKA_IK_LEN + EAP_AKA_CK_LEN];
281 : u8 keys[EAP_SIM_K_ENCR_LEN + EAP_AKA_PRIME_K_AUT_LEN +
282 : EAP_AKA_PRIME_K_RE_LEN + EAP_MSK_LEN + EAP_EMSK_LEN];
283 : u8 *pos;
284 :
285 : /*
286 : * MK = PRF'(IK'|CK',"EAP-AKA'"|Identity)
287 : * K_encr = MK[0..127]
288 : * K_aut = MK[128..383]
289 : * K_re = MK[384..639]
290 : * MSK = MK[640..1151]
291 : * EMSK = MK[1152..1663]
292 : */
293 :
294 27 : os_memcpy(key, ik, EAP_AKA_IK_LEN);
295 27 : os_memcpy(key + EAP_AKA_IK_LEN, ck, EAP_AKA_CK_LEN);
296 :
297 27 : prf_prime(key, "EAP-AKA'", identity, identity_len, NULL, 0,
298 : keys, sizeof(keys));
299 :
300 27 : pos = keys;
301 27 : os_memcpy(k_encr, pos, EAP_SIM_K_ENCR_LEN);
302 27 : wpa_hexdump_key(MSG_DEBUG, "EAP-AKA': K_encr",
303 : k_encr, EAP_SIM_K_ENCR_LEN);
304 27 : pos += EAP_SIM_K_ENCR_LEN;
305 :
306 27 : os_memcpy(k_aut, pos, EAP_AKA_PRIME_K_AUT_LEN);
307 27 : wpa_hexdump_key(MSG_DEBUG, "EAP-AKA': K_aut",
308 : k_aut, EAP_AKA_PRIME_K_AUT_LEN);
309 27 : pos += EAP_AKA_PRIME_K_AUT_LEN;
310 :
311 27 : os_memcpy(k_re, pos, EAP_AKA_PRIME_K_RE_LEN);
312 27 : wpa_hexdump_key(MSG_DEBUG, "EAP-AKA': K_re",
313 : k_re, EAP_AKA_PRIME_K_RE_LEN);
314 27 : pos += EAP_AKA_PRIME_K_RE_LEN;
315 :
316 27 : os_memcpy(msk, pos, EAP_MSK_LEN);
317 27 : wpa_hexdump_key(MSG_DEBUG, "EAP-AKA': MSK", msk, EAP_MSK_LEN);
318 27 : pos += EAP_MSK_LEN;
319 :
320 27 : os_memcpy(emsk, pos, EAP_EMSK_LEN);
321 27 : wpa_hexdump_key(MSG_DEBUG, "EAP-AKA': EMSK", emsk, EAP_EMSK_LEN);
322 27 : }
323 :
324 :
325 12 : int eap_aka_prime_derive_keys_reauth(const u8 *k_re, u16 counter,
326 : const u8 *identity, size_t identity_len,
327 : const u8 *nonce_s, u8 *msk, u8 *emsk)
328 : {
329 : u8 seed3[2 + EAP_SIM_NONCE_S_LEN];
330 : u8 keys[EAP_MSK_LEN + EAP_EMSK_LEN];
331 : u8 *pos;
332 :
333 : /*
334 : * MK = PRF'(K_re,"EAP-AKA' re-auth"|Identity|counter|NONCE_S)
335 : * MSK = MK[0..511]
336 : * EMSK = MK[512..1023]
337 : */
338 :
339 12 : WPA_PUT_BE16(seed3, counter);
340 12 : os_memcpy(seed3 + 2, nonce_s, EAP_SIM_NONCE_S_LEN);
341 :
342 12 : prf_prime(k_re, "EAP-AKA' re-auth", identity, identity_len,
343 : seed3, sizeof(seed3),
344 : keys, sizeof(keys));
345 :
346 12 : pos = keys;
347 12 : os_memcpy(msk, pos, EAP_MSK_LEN);
348 12 : wpa_hexdump_key(MSG_DEBUG, "EAP-AKA': MSK", msk, EAP_MSK_LEN);
349 12 : pos += EAP_MSK_LEN;
350 :
351 12 : os_memcpy(emsk, pos, EAP_EMSK_LEN);
352 12 : wpa_hexdump_key(MSG_DEBUG, "EAP-AKA': EMSK", emsk, EAP_EMSK_LEN);
353 :
354 12 : os_memset(keys, 0, sizeof(keys));
355 :
356 12 : return 0;
357 : }
358 :
359 :
360 42 : int eap_sim_verify_mac_sha256(const u8 *k_aut, const struct wpabuf *req,
361 : const u8 *mac, const u8 *extra, size_t extra_len)
362 : {
363 : unsigned char hmac[SHA256_MAC_LEN];
364 : const u8 *addr[2];
365 : size_t len[2];
366 : u8 *tmp;
367 :
368 84 : if (mac == NULL || wpabuf_len(req) < EAP_SIM_MAC_LEN ||
369 84 : mac < wpabuf_head_u8(req) ||
370 42 : mac > wpabuf_head_u8(req) + wpabuf_len(req) - EAP_SIM_MAC_LEN)
371 0 : return -1;
372 :
373 42 : tmp = os_malloc(wpabuf_len(req));
374 42 : if (tmp == NULL)
375 0 : return -1;
376 :
377 42 : addr[0] = tmp;
378 42 : len[0] = wpabuf_len(req);
379 42 : addr[1] = extra;
380 42 : len[1] = extra_len;
381 :
382 : /* HMAC-SHA-256-128 */
383 42 : os_memcpy(tmp, wpabuf_head(req), wpabuf_len(req));
384 42 : os_memset(tmp + (mac - wpabuf_head_u8(req)), 0, EAP_SIM_MAC_LEN);
385 42 : wpa_hexdump(MSG_MSGDUMP, "EAP-AKA': Verify MAC - msg",
386 : tmp, wpabuf_len(req));
387 42 : wpa_hexdump(MSG_MSGDUMP, "EAP-AKA': Verify MAC - extra data",
388 : extra, extra_len);
389 42 : wpa_hexdump_key(MSG_MSGDUMP, "EAP-AKA': Verify MAC - K_aut",
390 : k_aut, EAP_AKA_PRIME_K_AUT_LEN);
391 42 : hmac_sha256_vector(k_aut, EAP_AKA_PRIME_K_AUT_LEN, 2, addr, len, hmac);
392 42 : wpa_hexdump(MSG_MSGDUMP, "EAP-AKA': Verify MAC: MAC",
393 : hmac, EAP_SIM_MAC_LEN);
394 42 : os_free(tmp);
395 :
396 42 : return (os_memcmp_const(hmac, mac, EAP_SIM_MAC_LEN) == 0) ? 0 : 1;
397 : }
398 :
399 :
400 42 : void eap_sim_add_mac_sha256(const u8 *k_aut, const u8 *msg, size_t msg_len,
401 : u8 *mac, const u8 *extra, size_t extra_len)
402 : {
403 : unsigned char hmac[SHA256_MAC_LEN];
404 : const u8 *addr[2];
405 : size_t len[2];
406 :
407 42 : addr[0] = msg;
408 42 : len[0] = msg_len;
409 42 : addr[1] = extra;
410 42 : len[1] = extra_len;
411 :
412 : /* HMAC-SHA-256-128 */
413 42 : os_memset(mac, 0, EAP_SIM_MAC_LEN);
414 42 : wpa_hexdump(MSG_MSGDUMP, "EAP-AKA': Add MAC - msg", msg, msg_len);
415 42 : wpa_hexdump(MSG_MSGDUMP, "EAP-AKA': Add MAC - extra data",
416 : extra, extra_len);
417 42 : wpa_hexdump_key(MSG_MSGDUMP, "EAP-AKA': Add MAC - K_aut",
418 : k_aut, EAP_AKA_PRIME_K_AUT_LEN);
419 42 : hmac_sha256_vector(k_aut, EAP_AKA_PRIME_K_AUT_LEN, 2, addr, len, hmac);
420 42 : os_memcpy(mac, hmac, EAP_SIM_MAC_LEN);
421 42 : wpa_hexdump(MSG_MSGDUMP, "EAP-AKA': Add MAC: MAC",
422 : mac, EAP_SIM_MAC_LEN);
423 42 : }
424 :
425 :
426 27 : void eap_aka_prime_derive_ck_ik_prime(u8 *ck, u8 *ik, const u8 *sqn_ak,
427 : const u8 *network_name,
428 : size_t network_name_len)
429 : {
430 : u8 key[EAP_AKA_CK_LEN + EAP_AKA_IK_LEN];
431 : u8 hash[SHA256_MAC_LEN];
432 : const u8 *addr[5];
433 : size_t len[5];
434 : u8 fc;
435 : u8 l0[2], l1[2];
436 :
437 : /* 3GPP TS 33.402 V8.0.0
438 : * (CK', IK') = F(CK, IK, <access network identity>)
439 : */
440 : /* TODO: CK', IK' generation should really be moved into the actual
441 : * AKA procedure with network name passed in there and option to use
442 : * AMF separation bit = 1 (3GPP TS 33.401). */
443 :
444 : /* Change Request 33.402 CR 0033 to version 8.1.1 from
445 : * 3GPP TSG-SA WG3 Meeting #53 in September 2008:
446 : *
447 : * CK' || IK' = HMAC-SHA-256(Key, S)
448 : * S = FC || P0 || L0 || P1 || L1 || ... || Pn || Ln
449 : * Key = CK || IK
450 : * FC = 0x20
451 : * P0 = access network identity (3GPP TS 24.302)
452 : * L0 = length of acceess network identity (2 octets, big endian)
453 : * P1 = SQN xor AK (if AK is not used, AK is treaded as 000..0
454 : * L1 = 0x00 0x06
455 : */
456 :
457 27 : fc = 0x20;
458 :
459 27 : wpa_printf(MSG_DEBUG, "EAP-AKA': Derive (CK',IK') from (CK,IK)");
460 27 : wpa_hexdump_key(MSG_DEBUG, "EAP-AKA': CK", ck, EAP_AKA_CK_LEN);
461 27 : wpa_hexdump_key(MSG_DEBUG, "EAP-AKA': IK", ik, EAP_AKA_IK_LEN);
462 27 : wpa_printf(MSG_DEBUG, "EAP-AKA': FC = 0x%x", fc);
463 27 : wpa_hexdump_ascii(MSG_DEBUG, "EAP-AKA': P0 = Access network identity",
464 : network_name, network_name_len);
465 27 : wpa_hexdump(MSG_DEBUG, "EAP-AKA': P1 = SQN xor AK", sqn_ak, 6);
466 :
467 27 : os_memcpy(key, ck, EAP_AKA_CK_LEN);
468 27 : os_memcpy(key + EAP_AKA_CK_LEN, ik, EAP_AKA_IK_LEN);
469 27 : wpa_hexdump_key(MSG_DEBUG, "EAP-AKA': Key = CK || IK",
470 : key, sizeof(key));
471 :
472 27 : addr[0] = &fc;
473 27 : len[0] = 1;
474 27 : addr[1] = network_name;
475 27 : len[1] = network_name_len;
476 27 : WPA_PUT_BE16(l0, network_name_len);
477 27 : addr[2] = l0;
478 27 : len[2] = 2;
479 27 : addr[3] = sqn_ak;
480 27 : len[3] = 6;
481 27 : WPA_PUT_BE16(l1, 6);
482 27 : addr[4] = l1;
483 27 : len[4] = 2;
484 :
485 27 : hmac_sha256_vector(key, sizeof(key), 5, addr, len, hash);
486 27 : wpa_hexdump_key(MSG_DEBUG, "EAP-AKA': KDF output (CK' || IK')",
487 : hash, sizeof(hash));
488 :
489 27 : os_memcpy(ck, hash, EAP_AKA_CK_LEN);
490 27 : os_memcpy(ik, hash + EAP_AKA_CK_LEN, EAP_AKA_IK_LEN);
491 27 : wpa_hexdump_key(MSG_DEBUG, "EAP-AKA': CK'", ck, EAP_AKA_CK_LEN);
492 27 : wpa_hexdump_key(MSG_DEBUG, "EAP-AKA': IK'", ik, EAP_AKA_IK_LEN);
493 27 : }
494 : #endif /* EAP_AKA_PRIME || EAP_SERVER_AKA_PRIME */
495 :
496 :
497 714 : int eap_sim_parse_attr(const u8 *start, const u8 *end,
498 : struct eap_sim_attrs *attr, int aka, int encr)
499 : {
500 714 : const u8 *pos = start, *apos;
501 : size_t alen, plen, i, list_len;
502 :
503 714 : os_memset(attr, 0, sizeof(*attr));
504 714 : attr->id_req = NO_ID_REQ;
505 714 : attr->notification = -1;
506 714 : attr->counter = -1;
507 714 : attr->selected_version = -1;
508 714 : attr->client_error_code = -1;
509 :
510 3318 : while (pos < end) {
511 1926 : if (pos + 2 > end) {
512 1 : wpa_printf(MSG_INFO, "EAP-SIM: Attribute overflow(1)");
513 1 : return -1;
514 : }
515 3850 : wpa_printf(MSG_MSGDUMP, "EAP-SIM: Attribute: Type=%d Len=%d",
516 3850 : pos[0], pos[1] * 4);
517 1925 : if (pos + pos[1] * 4 > end) {
518 1 : wpa_printf(MSG_INFO, "EAP-SIM: Attribute overflow "
519 : "(pos=%p len=%d end=%p)",
520 1 : pos, pos[1] * 4, end);
521 1 : return -1;
522 : }
523 1924 : if (pos[1] == 0) {
524 1 : wpa_printf(MSG_INFO, "EAP-SIM: Attribute underflow");
525 1 : return -1;
526 : }
527 1923 : apos = pos + 2;
528 1923 : alen = pos[1] * 4 - 2;
529 1923 : wpa_hexdump(MSG_MSGDUMP, "EAP-SIM: Attribute data",
530 : apos, alen);
531 :
532 1923 : switch (pos[0]) {
533 : case EAP_SIM_AT_RAND:
534 112 : wpa_printf(MSG_DEBUG, "EAP-SIM: AT_RAND");
535 112 : apos += 2;
536 112 : alen -= 2;
537 112 : if ((!aka && (alen % GSM_RAND_LEN)) ||
538 65 : (aka && alen != EAP_AKA_RAND_LEN)) {
539 1 : wpa_printf(MSG_INFO, "EAP-SIM: Invalid AT_RAND"
540 : " (len %lu)",
541 : (unsigned long) alen);
542 1 : return -1;
543 : }
544 111 : attr->rand = apos;
545 111 : attr->num_chal = alen / GSM_RAND_LEN;
546 111 : break;
547 : case EAP_SIM_AT_AUTN:
548 66 : wpa_printf(MSG_DEBUG, "EAP-AKA: AT_AUTN");
549 66 : if (!aka) {
550 1 : wpa_printf(MSG_DEBUG, "EAP-SIM: "
551 : "Unexpected AT_AUTN");
552 1 : return -1;
553 : }
554 65 : apos += 2;
555 65 : alen -= 2;
556 65 : if (alen != EAP_AKA_AUTN_LEN) {
557 1 : wpa_printf(MSG_INFO, "EAP-AKA: Invalid AT_AUTN"
558 : " (len %lu)",
559 : (unsigned long) alen);
560 1 : return -1;
561 : }
562 64 : attr->autn = apos;
563 64 : break;
564 : case EAP_SIM_AT_PADDING:
565 89 : if (!encr) {
566 1 : wpa_printf(MSG_ERROR, "EAP-SIM: Unencrypted "
567 : "AT_PADDING");
568 1 : return -1;
569 : }
570 88 : wpa_printf(MSG_DEBUG, "EAP-SIM: (encr) AT_PADDING");
571 572 : for (i = 2; i < alen; i++) {
572 484 : if (apos[i] != 0) {
573 0 : wpa_printf(MSG_INFO, "EAP-SIM: (encr) "
574 : "AT_PADDING used a non-zero"
575 : " padding byte");
576 0 : wpa_hexdump(MSG_DEBUG, "EAP-SIM: "
577 : "(encr) padding bytes",
578 : apos + 2, alen - 2);
579 0 : return -1;
580 : }
581 : }
582 88 : break;
583 : case EAP_SIM_AT_NONCE_MT:
584 71 : wpa_printf(MSG_DEBUG, "EAP-SIM: AT_NONCE_MT");
585 71 : if (alen != 2 + EAP_SIM_NONCE_MT_LEN) {
586 1 : wpa_printf(MSG_INFO, "EAP-SIM: Invalid "
587 : "AT_NONCE_MT length");
588 1 : return -1;
589 : }
590 70 : attr->nonce_mt = apos + 2;
591 70 : break;
592 : case EAP_SIM_AT_PERMANENT_ID_REQ:
593 9 : wpa_printf(MSG_DEBUG, "EAP-SIM: AT_PERMANENT_ID_REQ");
594 9 : attr->id_req = PERMANENT_ID;
595 9 : break;
596 : case EAP_SIM_AT_MAC:
597 216 : wpa_printf(MSG_DEBUG, "EAP-SIM: AT_MAC");
598 216 : if (alen != 2 + EAP_SIM_MAC_LEN) {
599 1 : wpa_printf(MSG_INFO, "EAP-SIM: Invalid AT_MAC "
600 : "length");
601 1 : return -1;
602 : }
603 215 : attr->mac = apos + 2;
604 215 : break;
605 : case EAP_SIM_AT_NOTIFICATION:
606 21 : if (alen != 2) {
607 1 : wpa_printf(MSG_INFO, "EAP-SIM: Invalid "
608 : "AT_NOTIFICATION length %lu",
609 : (unsigned long) alen);
610 1 : return -1;
611 : }
612 20 : attr->notification = apos[0] * 256 + apos[1];
613 20 : wpa_printf(MSG_DEBUG, "EAP-SIM: AT_NOTIFICATION %d",
614 : attr->notification);
615 20 : break;
616 : case EAP_SIM_AT_ANY_ID_REQ:
617 93 : wpa_printf(MSG_DEBUG, "EAP-SIM: AT_ANY_ID_REQ");
618 93 : attr->id_req = ANY_ID;
619 93 : break;
620 : case EAP_SIM_AT_IDENTITY:
621 171 : wpa_printf(MSG_DEBUG, "EAP-SIM: AT_IDENTITY");
622 171 : plen = WPA_GET_BE16(apos);
623 171 : apos += 2;
624 171 : alen -= 2;
625 171 : if (plen > alen) {
626 1 : wpa_printf(MSG_INFO, "EAP-SIM: Invalid "
627 : "AT_IDENTITY (Actual Length %lu, "
628 : "remaining length %lu)",
629 : (unsigned long) plen,
630 : (unsigned long) alen);
631 1 : return -1;
632 : }
633 :
634 170 : attr->identity = apos;
635 170 : attr->identity_len = plen;
636 170 : break;
637 : case EAP_SIM_AT_VERSION_LIST:
638 59 : if (aka) {
639 1 : wpa_printf(MSG_DEBUG, "EAP-AKA: "
640 : "Unexpected AT_VERSION_LIST");
641 1 : return -1;
642 : }
643 58 : list_len = apos[0] * 256 + apos[1];
644 58 : wpa_printf(MSG_DEBUG, "EAP-SIM: AT_VERSION_LIST");
645 58 : if (list_len < 2 || list_len > alen - 2) {
646 2 : wpa_printf(MSG_WARNING, "EAP-SIM: Invalid "
647 : "AT_VERSION_LIST (list_len=%lu "
648 : "attr_len=%lu)",
649 : (unsigned long) list_len,
650 : (unsigned long) alen);
651 2 : return -1;
652 : }
653 56 : attr->version_list = apos + 2;
654 56 : attr->version_list_len = list_len;
655 56 : break;
656 : case EAP_SIM_AT_SELECTED_VERSION:
657 71 : wpa_printf(MSG_DEBUG, "EAP-SIM: AT_SELECTED_VERSION");
658 71 : if (alen != 2) {
659 1 : wpa_printf(MSG_INFO, "EAP-SIM: Invalid "
660 : "AT_SELECTED_VERSION length %lu",
661 : (unsigned long) alen);
662 1 : return -1;
663 : }
664 70 : attr->selected_version = apos[0] * 256 + apos[1];
665 70 : wpa_printf(MSG_DEBUG, "EAP-SIM: AT_SELECTED_VERSION "
666 : "%d", attr->selected_version);
667 70 : break;
668 : case EAP_SIM_AT_FULLAUTH_ID_REQ:
669 12 : wpa_printf(MSG_DEBUG, "EAP-SIM: AT_FULLAUTH_ID_REQ");
670 12 : attr->id_req = FULLAUTH_ID;
671 12 : break;
672 : case EAP_SIM_AT_COUNTER:
673 42 : if (!encr) {
674 1 : wpa_printf(MSG_ERROR, "EAP-SIM: Unencrypted "
675 : "AT_COUNTER");
676 1 : return -1;
677 : }
678 41 : if (alen != 2) {
679 0 : wpa_printf(MSG_INFO, "EAP-SIM: (encr) Invalid "
680 : "AT_COUNTER (alen=%lu)",
681 : (unsigned long) alen);
682 0 : return -1;
683 : }
684 41 : attr->counter = apos[0] * 256 + apos[1];
685 41 : wpa_printf(MSG_DEBUG, "EAP-SIM: (encr) AT_COUNTER %d",
686 : attr->counter);
687 41 : break;
688 : case EAP_SIM_AT_COUNTER_TOO_SMALL:
689 6 : if (!encr) {
690 1 : wpa_printf(MSG_ERROR, "EAP-SIM: Unencrypted "
691 : "AT_COUNTER_TOO_SMALL");
692 1 : return -1;
693 : }
694 5 : if (alen != 2) {
695 0 : wpa_printf(MSG_INFO, "EAP-SIM: (encr) Invalid "
696 : "AT_COUNTER_TOO_SMALL (alen=%lu)",
697 : (unsigned long) alen);
698 0 : return -1;
699 : }
700 5 : wpa_printf(MSG_DEBUG, "EAP-SIM: (encr) "
701 : "AT_COUNTER_TOO_SMALL");
702 5 : attr->counter_too_small = 1;
703 5 : break;
704 : case EAP_SIM_AT_NONCE_S:
705 19 : if (!encr) {
706 1 : wpa_printf(MSG_ERROR, "EAP-SIM: Unencrypted "
707 : "AT_NONCE_S");
708 1 : return -1;
709 : }
710 18 : wpa_printf(MSG_DEBUG, "EAP-SIM: (encr) "
711 : "AT_NONCE_S");
712 18 : if (alen != 2 + EAP_SIM_NONCE_S_LEN) {
713 0 : wpa_printf(MSG_INFO, "EAP-SIM: (encr) Invalid "
714 : "AT_NONCE_S (alen=%lu)",
715 : (unsigned long) alen);
716 0 : return -1;
717 : }
718 18 : attr->nonce_s = apos + 2;
719 18 : break;
720 : case EAP_SIM_AT_CLIENT_ERROR_CODE:
721 18 : if (alen != 2) {
722 1 : wpa_printf(MSG_INFO, "EAP-SIM: Invalid "
723 : "AT_CLIENT_ERROR_CODE length %lu",
724 : (unsigned long) alen);
725 1 : return -1;
726 : }
727 17 : attr->client_error_code = apos[0] * 256 + apos[1];
728 17 : wpa_printf(MSG_DEBUG, "EAP-SIM: AT_CLIENT_ERROR_CODE "
729 : "%d", attr->client_error_code);
730 17 : break;
731 : case EAP_SIM_AT_IV:
732 152 : wpa_printf(MSG_DEBUG, "EAP-SIM: AT_IV");
733 152 : if (alen != 2 + EAP_SIM_MAC_LEN) {
734 1 : wpa_printf(MSG_INFO, "EAP-SIM: Invalid AT_IV "
735 : "length %lu", (unsigned long) alen);
736 1 : return -1;
737 : }
738 151 : attr->iv = apos + 2;
739 151 : break;
740 : case EAP_SIM_AT_ENCR_DATA:
741 152 : wpa_printf(MSG_DEBUG, "EAP-SIM: AT_ENCR_DATA");
742 152 : attr->encr_data = apos + 2;
743 152 : attr->encr_data_len = alen - 2;
744 152 : if (attr->encr_data_len % 16) {
745 1 : wpa_printf(MSG_INFO, "EAP-SIM: Invalid "
746 : "AT_ENCR_DATA length %lu",
747 : (unsigned long)
748 : attr->encr_data_len);
749 1 : return -1;
750 : }
751 151 : break;
752 : case EAP_SIM_AT_NEXT_PSEUDONYM:
753 48 : if (!encr) {
754 1 : wpa_printf(MSG_ERROR, "EAP-SIM: Unencrypted "
755 : "AT_NEXT_PSEUDONYM");
756 1 : return -1;
757 : }
758 47 : wpa_printf(MSG_DEBUG, "EAP-SIM: (encr) "
759 : "AT_NEXT_PSEUDONYM");
760 47 : plen = apos[0] * 256 + apos[1];
761 47 : if (plen > alen - 2) {
762 0 : wpa_printf(MSG_INFO, "EAP-SIM: (encr) Invalid"
763 : " AT_NEXT_PSEUDONYM (actual"
764 : " len %lu, attr len %lu)",
765 : (unsigned long) plen,
766 : (unsigned long) alen);
767 0 : return -1;
768 : }
769 47 : attr->next_pseudonym = pos + 4;
770 47 : attr->next_pseudonym_len = plen;
771 47 : break;
772 : case EAP_SIM_AT_NEXT_REAUTH_ID:
773 63 : if (!encr) {
774 1 : wpa_printf(MSG_ERROR, "EAP-SIM: Unencrypted "
775 : "AT_NEXT_REAUTH_ID");
776 1 : return -1;
777 : }
778 62 : wpa_printf(MSG_DEBUG, "EAP-SIM: (encr) "
779 : "AT_NEXT_REAUTH_ID");
780 62 : plen = apos[0] * 256 + apos[1];
781 62 : if (plen > alen - 2) {
782 0 : wpa_printf(MSG_INFO, "EAP-SIM: (encr) Invalid"
783 : " AT_NEXT_REAUTH_ID (actual"
784 : " len %lu, attr len %lu)",
785 : (unsigned long) plen,
786 : (unsigned long) alen);
787 0 : return -1;
788 : }
789 62 : attr->next_reauth_id = pos + 4;
790 62 : attr->next_reauth_id_len = plen;
791 62 : break;
792 : case EAP_SIM_AT_RES:
793 29 : wpa_printf(MSG_DEBUG, "EAP-SIM: AT_RES");
794 29 : attr->res_len_bits = WPA_GET_BE16(apos);
795 29 : apos += 2;
796 29 : alen -= 2;
797 29 : if (!aka || alen < EAP_AKA_MIN_RES_LEN ||
798 : alen > EAP_AKA_MAX_RES_LEN) {
799 2 : wpa_printf(MSG_INFO, "EAP-SIM: Invalid AT_RES "
800 : "(len %lu)",
801 : (unsigned long) alen);
802 2 : return -1;
803 : }
804 27 : attr->res = apos;
805 27 : attr->res_len = alen;
806 27 : break;
807 : case EAP_SIM_AT_AUTS:
808 12 : wpa_printf(MSG_DEBUG, "EAP-AKA: AT_AUTS");
809 12 : if (!aka) {
810 1 : wpa_printf(MSG_DEBUG, "EAP-SIM: "
811 : "Unexpected AT_AUTS");
812 1 : return -1;
813 : }
814 11 : if (alen != EAP_AKA_AUTS_LEN) {
815 1 : wpa_printf(MSG_INFO, "EAP-AKA: Invalid AT_AUTS"
816 : " (len %lu)",
817 : (unsigned long) alen);
818 1 : return -1;
819 : }
820 10 : attr->auts = apos;
821 10 : break;
822 : case EAP_SIM_AT_CHECKCODE:
823 121 : wpa_printf(MSG_DEBUG, "EAP-AKA: AT_CHECKCODE");
824 121 : if (!aka) {
825 1 : wpa_printf(MSG_DEBUG, "EAP-SIM: "
826 : "Unexpected AT_CHECKCODE");
827 1 : return -1;
828 : }
829 120 : apos += 2;
830 120 : alen -= 2;
831 120 : if (alen != 0 && alen != EAP_AKA_CHECKCODE_LEN &&
832 : alen != EAP_AKA_PRIME_CHECKCODE_LEN) {
833 1 : wpa_printf(MSG_INFO, "EAP-AKA: Invalid "
834 : "AT_CHECKCODE (len %lu)",
835 : (unsigned long) alen);
836 1 : return -1;
837 : }
838 119 : attr->checkcode = apos;
839 119 : attr->checkcode_len = alen;
840 119 : break;
841 : case EAP_SIM_AT_RESULT_IND:
842 128 : if (encr) {
843 0 : wpa_printf(MSG_ERROR, "EAP-SIM: Encrypted "
844 : "AT_RESULT_IND");
845 0 : return -1;
846 : }
847 128 : if (alen != 2) {
848 1 : wpa_printf(MSG_INFO, "EAP-SIM: Invalid "
849 : "AT_RESULT_IND (alen=%lu)",
850 : (unsigned long) alen);
851 1 : return -1;
852 : }
853 127 : wpa_printf(MSG_DEBUG, "EAP-SIM: AT_RESULT_IND");
854 127 : attr->result_ind = 1;
855 127 : break;
856 : #if defined(EAP_AKA_PRIME) || defined(EAP_SERVER_AKA_PRIME)
857 : case EAP_SIM_AT_KDF_INPUT:
858 30 : if (aka != 2) {
859 1 : wpa_printf(MSG_INFO, "EAP-AKA: Unexpected "
860 : "AT_KDF_INPUT");
861 1 : return -1;
862 : }
863 :
864 29 : wpa_printf(MSG_DEBUG, "EAP-AKA: AT_KDF_INPUT");
865 29 : plen = WPA_GET_BE16(apos);
866 29 : apos += 2;
867 29 : alen -= 2;
868 29 : if (plen > alen) {
869 1 : wpa_printf(MSG_INFO, "EAP-AKA': Invalid "
870 : "AT_KDF_INPUT (Actual Length %lu, "
871 : "remaining length %lu)",
872 : (unsigned long) plen,
873 : (unsigned long) alen);
874 1 : return -1;
875 : }
876 28 : attr->kdf_input = apos;
877 28 : attr->kdf_input_len = plen;
878 28 : break;
879 : case EAP_SIM_AT_KDF:
880 62 : if (aka != 2) {
881 1 : wpa_printf(MSG_INFO, "EAP-AKA: Unexpected "
882 : "AT_KDF");
883 1 : return -1;
884 : }
885 :
886 61 : wpa_printf(MSG_DEBUG, "EAP-AKA: AT_KDF");
887 61 : if (alen != 2) {
888 1 : wpa_printf(MSG_INFO, "EAP-AKA': Invalid "
889 : "AT_KDF (len %lu)",
890 : (unsigned long) alen);
891 1 : return -1;
892 : }
893 60 : if (attr->kdf_count == EAP_AKA_PRIME_KDF_MAX) {
894 2 : wpa_printf(MSG_DEBUG, "EAP-AKA': Too many "
895 : "AT_KDF attributes - ignore this");
896 2 : break;
897 : }
898 58 : attr->kdf[attr->kdf_count] = WPA_GET_BE16(apos);
899 58 : attr->kdf_count++;
900 58 : break;
901 : case EAP_SIM_AT_BIDDING:
902 49 : wpa_printf(MSG_DEBUG, "EAP-AKA: AT_BIDDING");
903 49 : if (alen != 2) {
904 1 : wpa_printf(MSG_INFO, "EAP-AKA: Invalid "
905 : "AT_BIDDING (len %lu)",
906 : (unsigned long) alen);
907 1 : return -1;
908 : }
909 48 : attr->bidding = apos;
910 48 : break;
911 : #endif /* EAP_AKA_PRIME || EAP_SERVER_AKA_PRIME */
912 : default:
913 2 : if (pos[0] < 128) {
914 1 : wpa_printf(MSG_INFO, "EAP-SIM: Unrecognized "
915 : "non-skippable attribute %d",
916 1 : pos[0]);
917 1 : return -1;
918 : }
919 :
920 1 : wpa_printf(MSG_DEBUG, "EAP-SIM: Unrecognized skippable"
921 1 : " attribute %d ignored", pos[0]);
922 1 : break;
923 : }
924 :
925 1890 : pos += pos[1] * 4;
926 : }
927 :
928 678 : wpa_printf(MSG_DEBUG, "EAP-SIM: Attributes parsed successfully "
929 : "(aka=%d encr=%d)", aka, encr);
930 :
931 678 : return 0;
932 : }
933 :
934 :
935 88 : u8 * eap_sim_parse_encr(const u8 *k_encr, const u8 *encr_data,
936 : size_t encr_data_len, const u8 *iv,
937 : struct eap_sim_attrs *attr, int aka)
938 : {
939 : u8 *decrypted;
940 :
941 88 : if (!iv) {
942 0 : wpa_printf(MSG_INFO, "EAP-SIM: Encrypted data, but no IV");
943 0 : return NULL;
944 : }
945 :
946 88 : decrypted = os_malloc(encr_data_len);
947 88 : if (decrypted == NULL)
948 0 : return NULL;
949 88 : os_memcpy(decrypted, encr_data, encr_data_len);
950 :
951 88 : if (aes_128_cbc_decrypt(k_encr, iv, decrypted, encr_data_len)) {
952 0 : os_free(decrypted);
953 0 : return NULL;
954 : }
955 88 : wpa_hexdump(MSG_MSGDUMP, "EAP-SIM: Decrypted AT_ENCR_DATA",
956 : decrypted, encr_data_len);
957 :
958 88 : if (eap_sim_parse_attr(decrypted, decrypted + encr_data_len, attr,
959 : aka, 1)) {
960 0 : wpa_printf(MSG_INFO, "EAP-SIM: (encr) Failed to parse "
961 : "decrypted AT_ENCR_DATA");
962 0 : os_free(decrypted);
963 0 : return NULL;
964 : }
965 :
966 88 : return decrypted;
967 : }
968 :
969 :
970 : #define EAP_SIM_INIT_LEN 128
971 :
972 : struct eap_sim_msg {
973 : struct wpabuf *buf;
974 : size_t mac, iv, encr; /* index from buf */
975 : };
976 :
977 :
978 523 : struct eap_sim_msg * eap_sim_msg_init(int code, int id, int type, int subtype)
979 : {
980 : struct eap_sim_msg *msg;
981 : struct eap_hdr *eap;
982 : u8 *pos;
983 :
984 523 : msg = os_zalloc(sizeof(*msg));
985 523 : if (msg == NULL)
986 0 : return NULL;
987 :
988 523 : msg->buf = wpabuf_alloc(EAP_SIM_INIT_LEN);
989 523 : if (msg->buf == NULL) {
990 0 : os_free(msg);
991 0 : return NULL;
992 : }
993 523 : eap = wpabuf_put(msg->buf, sizeof(*eap));
994 523 : eap->code = code;
995 523 : eap->identifier = id;
996 :
997 523 : pos = wpabuf_put(msg->buf, 4);
998 523 : *pos++ = type;
999 523 : *pos++ = subtype;
1000 523 : *pos++ = 0; /* Reserved */
1001 523 : *pos++ = 0; /* Reserved */
1002 :
1003 523 : return msg;
1004 : }
1005 :
1006 :
1007 523 : struct wpabuf * eap_sim_msg_finish(struct eap_sim_msg *msg, int type,
1008 : const u8 *k_aut,
1009 : const u8 *extra, size_t extra_len)
1010 : {
1011 : struct eap_hdr *eap;
1012 : struct wpabuf *buf;
1013 :
1014 523 : if (msg == NULL)
1015 0 : return NULL;
1016 :
1017 523 : eap = wpabuf_mhead(msg->buf);
1018 523 : eap->length = host_to_be16(wpabuf_len(msg->buf));
1019 :
1020 : #if defined(EAP_AKA_PRIME) || defined(EAP_SERVER_AKA_PRIME)
1021 523 : if (k_aut && msg->mac && type == EAP_TYPE_AKA_PRIME) {
1022 84 : eap_sim_add_mac_sha256(k_aut, (u8 *) wpabuf_head(msg->buf),
1023 42 : wpabuf_len(msg->buf),
1024 42 : (u8 *) wpabuf_mhead(msg->buf) +
1025 : msg->mac, extra, extra_len);
1026 : } else
1027 : #endif /* EAP_AKA_PRIME || EAP_SERVER_AKA_PRIME */
1028 481 : if (k_aut && msg->mac) {
1029 280 : eap_sim_add_mac(k_aut, (u8 *) wpabuf_head(msg->buf),
1030 140 : wpabuf_len(msg->buf),
1031 140 : (u8 *) wpabuf_mhead(msg->buf) + msg->mac,
1032 : extra, extra_len);
1033 : }
1034 :
1035 523 : buf = msg->buf;
1036 523 : os_free(msg);
1037 523 : return buf;
1038 : }
1039 :
1040 :
1041 0 : void eap_sim_msg_free(struct eap_sim_msg *msg)
1042 : {
1043 0 : if (msg) {
1044 0 : wpabuf_free(msg->buf);
1045 0 : os_free(msg);
1046 : }
1047 0 : }
1048 :
1049 :
1050 5 : u8 * eap_sim_msg_add_full(struct eap_sim_msg *msg, u8 attr,
1051 : const u8 *data, size_t len)
1052 : {
1053 5 : int attr_len = 2 + len;
1054 : int pad_len;
1055 : u8 *start;
1056 :
1057 5 : if (msg == NULL)
1058 0 : return NULL;
1059 :
1060 5 : pad_len = (4 - attr_len % 4) % 4;
1061 5 : attr_len += pad_len;
1062 5 : if (wpabuf_resize(&msg->buf, attr_len))
1063 0 : return NULL;
1064 5 : start = wpabuf_put(msg->buf, 0);
1065 5 : wpabuf_put_u8(msg->buf, attr);
1066 5 : wpabuf_put_u8(msg->buf, attr_len / 4);
1067 5 : wpabuf_put_data(msg->buf, data, len);
1068 5 : if (pad_len)
1069 0 : os_memset(wpabuf_put(msg->buf, pad_len), 0, pad_len);
1070 5 : return start;
1071 : }
1072 :
1073 :
1074 1687 : u8 * eap_sim_msg_add(struct eap_sim_msg *msg, u8 attr, u16 value,
1075 : const u8 *data, size_t len)
1076 : {
1077 1687 : int attr_len = 4 + len;
1078 : int pad_len;
1079 : u8 *start;
1080 :
1081 1687 : if (msg == NULL)
1082 0 : return NULL;
1083 :
1084 1687 : pad_len = (4 - attr_len % 4) % 4;
1085 1687 : attr_len += pad_len;
1086 1687 : if (wpabuf_resize(&msg->buf, attr_len))
1087 0 : return NULL;
1088 1687 : start = wpabuf_put(msg->buf, 0);
1089 1687 : wpabuf_put_u8(msg->buf, attr);
1090 1687 : wpabuf_put_u8(msg->buf, attr_len / 4);
1091 1687 : wpabuf_put_be16(msg->buf, value);
1092 1687 : if (data)
1093 649 : wpabuf_put_data(msg->buf, data, len);
1094 : else
1095 1038 : wpabuf_put(msg->buf, len);
1096 1687 : if (pad_len)
1097 265 : os_memset(wpabuf_put(msg->buf, pad_len), 0, pad_len);
1098 1687 : return start;
1099 : }
1100 :
1101 :
1102 182 : u8 * eap_sim_msg_add_mac(struct eap_sim_msg *msg, u8 attr)
1103 : {
1104 182 : u8 *pos = eap_sim_msg_add(msg, attr, 0, NULL, EAP_SIM_MAC_LEN);
1105 182 : if (pos)
1106 182 : msg->mac = (pos - wpabuf_head_u8(msg->buf)) + 4;
1107 182 : return pos;
1108 : }
1109 :
1110 :
1111 128 : int eap_sim_msg_add_encr_start(struct eap_sim_msg *msg, u8 attr_iv,
1112 : u8 attr_encr)
1113 : {
1114 128 : u8 *pos = eap_sim_msg_add(msg, attr_iv, 0, NULL, EAP_SIM_IV_LEN);
1115 128 : if (pos == NULL)
1116 0 : return -1;
1117 128 : msg->iv = (pos - wpabuf_head_u8(msg->buf)) + 4;
1118 128 : if (random_get_bytes(wpabuf_mhead_u8(msg->buf) + msg->iv,
1119 : EAP_SIM_IV_LEN)) {
1120 0 : msg->iv = 0;
1121 0 : return -1;
1122 : }
1123 :
1124 128 : pos = eap_sim_msg_add(msg, attr_encr, 0, NULL, 0);
1125 128 : if (pos == NULL) {
1126 0 : msg->iv = 0;
1127 0 : return -1;
1128 : }
1129 128 : msg->encr = pos - wpabuf_head_u8(msg->buf);
1130 :
1131 128 : return 0;
1132 : }
1133 :
1134 :
1135 128 : int eap_sim_msg_add_encr_end(struct eap_sim_msg *msg, u8 *k_encr, int attr_pad)
1136 : {
1137 : size_t encr_len;
1138 :
1139 128 : if (msg == NULL || k_encr == NULL || msg->iv == 0 || msg->encr == 0)
1140 0 : return -1;
1141 :
1142 128 : encr_len = wpabuf_len(msg->buf) - msg->encr - 4;
1143 128 : if (encr_len % 16) {
1144 : u8 *pos;
1145 128 : int pad_len = 16 - (encr_len % 16);
1146 128 : if (pad_len < 4) {
1147 0 : wpa_printf(MSG_WARNING, "EAP-SIM: "
1148 : "eap_sim_msg_add_encr_end - invalid pad_len"
1149 : " %d", pad_len);
1150 0 : return -1;
1151 : }
1152 128 : wpa_printf(MSG_DEBUG, " *AT_PADDING");
1153 128 : pos = eap_sim_msg_add(msg, attr_pad, 0, NULL, pad_len - 4);
1154 128 : if (pos == NULL)
1155 0 : return -1;
1156 128 : os_memset(pos + 4, 0, pad_len - 4);
1157 128 : encr_len += pad_len;
1158 : }
1159 128 : wpa_printf(MSG_DEBUG, " (AT_ENCR_DATA data len %lu)",
1160 : (unsigned long) encr_len);
1161 128 : wpabuf_mhead_u8(msg->buf)[msg->encr + 1] = encr_len / 4 + 1;
1162 128 : return aes_128_cbc_encrypt(k_encr, wpabuf_head_u8(msg->buf) + msg->iv,
1163 128 : wpabuf_mhead_u8(msg->buf) + msg->encr + 4,
1164 : encr_len);
1165 : }
1166 :
1167 :
1168 14 : void eap_sim_report_notification(void *msg_ctx, int notification, int aka)
1169 : {
1170 : #ifndef CONFIG_NO_STDOUT_DEBUG
1171 14 : const char *type = aka ? "AKA" : "SIM";
1172 : #endif /* CONFIG_NO_STDOUT_DEBUG */
1173 :
1174 14 : switch (notification) {
1175 : case EAP_SIM_GENERAL_FAILURE_AFTER_AUTH:
1176 0 : wpa_printf(MSG_WARNING, "EAP-%s: General failure "
1177 : "notification (after authentication)", type);
1178 0 : break;
1179 : case EAP_SIM_TEMPORARILY_DENIED:
1180 0 : wpa_printf(MSG_WARNING, "EAP-%s: Failure notification: "
1181 : "User has been temporarily denied access to the "
1182 : "requested service", type);
1183 0 : break;
1184 : case EAP_SIM_NOT_SUBSCRIBED:
1185 0 : wpa_printf(MSG_WARNING, "EAP-%s: Failure notification: "
1186 : "User has not subscribed to the requested service",
1187 : type);
1188 0 : break;
1189 : case EAP_SIM_GENERAL_FAILURE_BEFORE_AUTH:
1190 3 : wpa_printf(MSG_WARNING, "EAP-%s: General failure "
1191 : "notification (before authentication)", type);
1192 3 : break;
1193 : case EAP_SIM_SUCCESS:
1194 7 : wpa_printf(MSG_INFO, "EAP-%s: Successful authentication "
1195 : "notification", type);
1196 7 : break;
1197 : default:
1198 4 : if (notification >= 32768) {
1199 2 : wpa_printf(MSG_INFO, "EAP-%s: Unrecognized "
1200 : "non-failure notification %d",
1201 : type, notification);
1202 : } else {
1203 2 : wpa_printf(MSG_WARNING, "EAP-%s: Unrecognized "
1204 : "failure notification %d",
1205 : type, notification);
1206 : }
1207 : }
1208 14 : }
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