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OpenSSL: Fix memory leak in OCSP parsing
[thirdparty/hostap.git] / src / crypto / tls_openssl.c
1 /*
2 * SSL/TLS interface functions for OpenSSL
3 * Copyright (c) 2004-2015, 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 #ifndef CONFIG_SMARTCARD
12 #ifndef OPENSSL_NO_ENGINE
13 #ifndef ANDROID
14 #define OPENSSL_NO_ENGINE
15 #endif
16 #endif
17 #endif
18
19 #include <openssl/ssl.h>
20 #include <openssl/err.h>
21 #include <openssl/pkcs12.h>
22 #include <openssl/x509v3.h>
23 #ifndef OPENSSL_NO_ENGINE
24 #include <openssl/engine.h>
25 #endif /* OPENSSL_NO_ENGINE */
26 #ifndef OPENSSL_NO_DSA
27 #include <openssl/dsa.h>
28 #endif
29 #ifndef OPENSSL_NO_DH
30 #include <openssl/dh.h>
31 #endif
32
33 #include "common.h"
34 #include "crypto.h"
35 #include "sha1.h"
36 #include "sha256.h"
37 #include "tls.h"
38 #include "tls_openssl.h"
39
40 #if defined(OPENSSL_IS_BORINGSSL)
41 /* stack_index_t is the return type of OpenSSL's sk_XXX_num() functions. */
42 typedef size_t stack_index_t;
43 #else
44 typedef int stack_index_t;
45 #endif
46
47 #ifdef SSL_set_tlsext_status_type
48 #ifndef OPENSSL_NO_TLSEXT
49 #define HAVE_OCSP
50 #include <openssl/ocsp.h>
51 #endif /* OPENSSL_NO_TLSEXT */
52 #endif /* SSL_set_tlsext_status_type */
53
54 #if OPENSSL_VERSION_NUMBER < 0x10100000L || defined(LIBRESSL_VERSION_NUMBER)
55 /*
56 * SSL_get_client_random() and SSL_get_server_random() were added in OpenSSL
57 * 1.1.0. Provide compatibility wrappers for older versions.
58 */
59
60 static size_t SSL_get_client_random(const SSL *ssl, unsigned char *out,
61 size_t outlen)
62 {
63 if (!ssl->s3 || outlen < SSL3_RANDOM_SIZE)
64 return 0;
65 os_memcpy(out, ssl->s3->client_random, SSL3_RANDOM_SIZE);
66 return SSL3_RANDOM_SIZE;
67 }
68
69
70 static size_t SSL_get_server_random(const SSL *ssl, unsigned char *out,
71 size_t outlen)
72 {
73 if (!ssl->s3 || outlen < SSL3_RANDOM_SIZE)
74 return 0;
75 os_memcpy(out, ssl->s3->server_random, SSL3_RANDOM_SIZE);
76 return SSL3_RANDOM_SIZE;
77 }
78
79
80 static size_t SSL_SESSION_get_master_key(const SSL_SESSION *session,
81 unsigned char *out, size_t outlen)
82 {
83 if (!session || session->master_key_length < 0 ||
84 (size_t) session->master_key_length > outlen)
85 return 0;
86 if ((size_t) session->master_key_length < outlen)
87 outlen = session->master_key_length;
88 os_memcpy(out, session->master_key, outlen);
89 return outlen;
90 }
91
92 #endif
93
94 #ifdef ANDROID
95 #include <openssl/pem.h>
96 #include <keystore/keystore_get.h>
97
98 static BIO * BIO_from_keystore(const char *key)
99 {
100 BIO *bio = NULL;
101 uint8_t *value = NULL;
102 int length = keystore_get(key, strlen(key), &value);
103 if (length != -1 && (bio = BIO_new(BIO_s_mem())) != NULL)
104 BIO_write(bio, value, length);
105 free(value);
106 return bio;
107 }
108
109
110 static int tls_add_ca_from_keystore(X509_STORE *ctx, const char *key_alias)
111 {
112 BIO *bio = BIO_from_keystore(key_alias);
113 STACK_OF(X509_INFO) *stack = NULL;
114 stack_index_t i;
115
116 if (bio) {
117 stack = PEM_X509_INFO_read_bio(bio, NULL, NULL, NULL);
118 BIO_free(bio);
119 }
120
121 if (!stack) {
122 wpa_printf(MSG_WARNING, "TLS: Failed to parse certificate: %s",
123 key_alias);
124 return -1;
125 }
126
127 for (i = 0; i < sk_X509_INFO_num(stack); ++i) {
128 X509_INFO *info = sk_X509_INFO_value(stack, i);
129
130 if (info->x509)
131 X509_STORE_add_cert(ctx, info->x509);
132 if (info->crl)
133 X509_STORE_add_crl(ctx, info->crl);
134 }
135
136 sk_X509_INFO_pop_free(stack, X509_INFO_free);
137
138 return 0;
139 }
140
141
142 static int tls_add_ca_from_keystore_encoded(X509_STORE *ctx,
143 const char *encoded_key_alias)
144 {
145 int rc = -1;
146 int len = os_strlen(encoded_key_alias);
147 unsigned char *decoded_alias;
148
149 if (len & 1) {
150 wpa_printf(MSG_WARNING, "Invalid hex-encoded alias: %s",
151 encoded_key_alias);
152 return rc;
153 }
154
155 decoded_alias = os_malloc(len / 2 + 1);
156 if (decoded_alias) {
157 if (!hexstr2bin(encoded_key_alias, decoded_alias, len / 2)) {
158 decoded_alias[len / 2] = '\0';
159 rc = tls_add_ca_from_keystore(
160 ctx, (const char *) decoded_alias);
161 }
162 os_free(decoded_alias);
163 }
164
165 return rc;
166 }
167
168 #endif /* ANDROID */
169
170 static int tls_openssl_ref_count = 0;
171 static int tls_ex_idx_session = -1;
172
173 struct tls_context {
174 void (*event_cb)(void *ctx, enum tls_event ev,
175 union tls_event_data *data);
176 void *cb_ctx;
177 int cert_in_cb;
178 char *ocsp_stapling_response;
179 };
180
181 static struct tls_context *tls_global = NULL;
182
183
184 struct tls_data {
185 SSL_CTX *ssl;
186 unsigned int tls_session_lifetime;
187 };
188
189 struct tls_connection {
190 struct tls_context *context;
191 SSL_CTX *ssl_ctx;
192 SSL *ssl;
193 BIO *ssl_in, *ssl_out;
194 #if defined(ANDROID) || !defined(OPENSSL_NO_ENGINE)
195 ENGINE *engine; /* functional reference to the engine */
196 EVP_PKEY *private_key; /* the private key if using engine */
197 #endif /* OPENSSL_NO_ENGINE */
198 char *subject_match, *altsubject_match, *suffix_match, *domain_match;
199 int read_alerts, write_alerts, failed;
200
201 tls_session_ticket_cb session_ticket_cb;
202 void *session_ticket_cb_ctx;
203
204 /* SessionTicket received from OpenSSL hello_extension_cb (server) */
205 u8 *session_ticket;
206 size_t session_ticket_len;
207
208 unsigned int ca_cert_verify:1;
209 unsigned int cert_probe:1;
210 unsigned int server_cert_only:1;
211 unsigned int invalid_hb_used:1;
212 unsigned int success_data:1;
213
214 u8 srv_cert_hash[32];
215
216 unsigned int flags;
217
218 X509 *peer_cert;
219 X509 *peer_issuer;
220 X509 *peer_issuer_issuer;
221
222 unsigned char client_random[SSL3_RANDOM_SIZE];
223 unsigned char server_random[SSL3_RANDOM_SIZE];
224 };
225
226
227 static struct tls_context * tls_context_new(const struct tls_config *conf)
228 {
229 struct tls_context *context = os_zalloc(sizeof(*context));
230 if (context == NULL)
231 return NULL;
232 if (conf) {
233 context->event_cb = conf->event_cb;
234 context->cb_ctx = conf->cb_ctx;
235 context->cert_in_cb = conf->cert_in_cb;
236 }
237 return context;
238 }
239
240
241 #ifdef CONFIG_NO_STDOUT_DEBUG
242
243 static void _tls_show_errors(void)
244 {
245 unsigned long err;
246
247 while ((err = ERR_get_error())) {
248 /* Just ignore the errors, since stdout is disabled */
249 }
250 }
251 #define tls_show_errors(l, f, t) _tls_show_errors()
252
253 #else /* CONFIG_NO_STDOUT_DEBUG */
254
255 static void tls_show_errors(int level, const char *func, const char *txt)
256 {
257 unsigned long err;
258
259 wpa_printf(level, "OpenSSL: %s - %s %s",
260 func, txt, ERR_error_string(ERR_get_error(), NULL));
261
262 while ((err = ERR_get_error())) {
263 wpa_printf(MSG_INFO, "OpenSSL: pending error: %s",
264 ERR_error_string(err, NULL));
265 }
266 }
267
268 #endif /* CONFIG_NO_STDOUT_DEBUG */
269
270
271 #ifdef CONFIG_NATIVE_WINDOWS
272
273 /* Windows CryptoAPI and access to certificate stores */
274 #include <wincrypt.h>
275
276 #ifdef __MINGW32_VERSION
277 /*
278 * MinGW does not yet include all the needed definitions for CryptoAPI, so
279 * define here whatever extra is needed.
280 */
281 #define CERT_SYSTEM_STORE_CURRENT_USER (1 << 16)
282 #define CERT_STORE_READONLY_FLAG 0x00008000
283 #define CERT_STORE_OPEN_EXISTING_FLAG 0x00004000
284
285 #endif /* __MINGW32_VERSION */
286
287
288 struct cryptoapi_rsa_data {
289 const CERT_CONTEXT *cert;
290 HCRYPTPROV crypt_prov;
291 DWORD key_spec;
292 BOOL free_crypt_prov;
293 };
294
295
296 static void cryptoapi_error(const char *msg)
297 {
298 wpa_printf(MSG_INFO, "CryptoAPI: %s; err=%u",
299 msg, (unsigned int) GetLastError());
300 }
301
302
303 static int cryptoapi_rsa_pub_enc(int flen, const unsigned char *from,
304 unsigned char *to, RSA *rsa, int padding)
305 {
306 wpa_printf(MSG_DEBUG, "%s - not implemented", __func__);
307 return 0;
308 }
309
310
311 static int cryptoapi_rsa_pub_dec(int flen, const unsigned char *from,
312 unsigned char *to, RSA *rsa, int padding)
313 {
314 wpa_printf(MSG_DEBUG, "%s - not implemented", __func__);
315 return 0;
316 }
317
318
319 static int cryptoapi_rsa_priv_enc(int flen, const unsigned char *from,
320 unsigned char *to, RSA *rsa, int padding)
321 {
322 struct cryptoapi_rsa_data *priv =
323 (struct cryptoapi_rsa_data *) rsa->meth->app_data;
324 HCRYPTHASH hash;
325 DWORD hash_size, len, i;
326 unsigned char *buf = NULL;
327 int ret = 0;
328
329 if (priv == NULL) {
330 RSAerr(RSA_F_RSA_EAY_PRIVATE_ENCRYPT,
331 ERR_R_PASSED_NULL_PARAMETER);
332 return 0;
333 }
334
335 if (padding != RSA_PKCS1_PADDING) {
336 RSAerr(RSA_F_RSA_EAY_PRIVATE_ENCRYPT,
337 RSA_R_UNKNOWN_PADDING_TYPE);
338 return 0;
339 }
340
341 if (flen != 16 /* MD5 */ + 20 /* SHA-1 */) {
342 wpa_printf(MSG_INFO, "%s - only MD5-SHA1 hash supported",
343 __func__);
344 RSAerr(RSA_F_RSA_EAY_PRIVATE_ENCRYPT,
345 RSA_R_INVALID_MESSAGE_LENGTH);
346 return 0;
347 }
348
349 if (!CryptCreateHash(priv->crypt_prov, CALG_SSL3_SHAMD5, 0, 0, &hash))
350 {
351 cryptoapi_error("CryptCreateHash failed");
352 return 0;
353 }
354
355 len = sizeof(hash_size);
356 if (!CryptGetHashParam(hash, HP_HASHSIZE, (BYTE *) &hash_size, &len,
357 0)) {
358 cryptoapi_error("CryptGetHashParam failed");
359 goto err;
360 }
361
362 if ((int) hash_size != flen) {
363 wpa_printf(MSG_INFO, "CryptoAPI: Invalid hash size (%u != %d)",
364 (unsigned) hash_size, flen);
365 RSAerr(RSA_F_RSA_EAY_PRIVATE_ENCRYPT,
366 RSA_R_INVALID_MESSAGE_LENGTH);
367 goto err;
368 }
369 if (!CryptSetHashParam(hash, HP_HASHVAL, (BYTE * ) from, 0)) {
370 cryptoapi_error("CryptSetHashParam failed");
371 goto err;
372 }
373
374 len = RSA_size(rsa);
375 buf = os_malloc(len);
376 if (buf == NULL) {
377 RSAerr(RSA_F_RSA_EAY_PRIVATE_ENCRYPT, ERR_R_MALLOC_FAILURE);
378 goto err;
379 }
380
381 if (!CryptSignHash(hash, priv->key_spec, NULL, 0, buf, &len)) {
382 cryptoapi_error("CryptSignHash failed");
383 goto err;
384 }
385
386 for (i = 0; i < len; i++)
387 to[i] = buf[len - i - 1];
388 ret = len;
389
390 err:
391 os_free(buf);
392 CryptDestroyHash(hash);
393
394 return ret;
395 }
396
397
398 static int cryptoapi_rsa_priv_dec(int flen, const unsigned char *from,
399 unsigned char *to, RSA *rsa, int padding)
400 {
401 wpa_printf(MSG_DEBUG, "%s - not implemented", __func__);
402 return 0;
403 }
404
405
406 static void cryptoapi_free_data(struct cryptoapi_rsa_data *priv)
407 {
408 if (priv == NULL)
409 return;
410 if (priv->crypt_prov && priv->free_crypt_prov)
411 CryptReleaseContext(priv->crypt_prov, 0);
412 if (priv->cert)
413 CertFreeCertificateContext(priv->cert);
414 os_free(priv);
415 }
416
417
418 static int cryptoapi_finish(RSA *rsa)
419 {
420 cryptoapi_free_data((struct cryptoapi_rsa_data *) rsa->meth->app_data);
421 os_free((void *) rsa->meth);
422 rsa->meth = NULL;
423 return 1;
424 }
425
426
427 static const CERT_CONTEXT * cryptoapi_find_cert(const char *name, DWORD store)
428 {
429 HCERTSTORE cs;
430 const CERT_CONTEXT *ret = NULL;
431
432 cs = CertOpenStore((LPCSTR) CERT_STORE_PROV_SYSTEM, 0, 0,
433 store | CERT_STORE_OPEN_EXISTING_FLAG |
434 CERT_STORE_READONLY_FLAG, L"MY");
435 if (cs == NULL) {
436 cryptoapi_error("Failed to open 'My system store'");
437 return NULL;
438 }
439
440 if (strncmp(name, "cert://", 7) == 0) {
441 unsigned short wbuf[255];
442 MultiByteToWideChar(CP_ACP, 0, name + 7, -1, wbuf, 255);
443 ret = CertFindCertificateInStore(cs, X509_ASN_ENCODING |
444 PKCS_7_ASN_ENCODING,
445 0, CERT_FIND_SUBJECT_STR,
446 wbuf, NULL);
447 } else if (strncmp(name, "hash://", 7) == 0) {
448 CRYPT_HASH_BLOB blob;
449 int len;
450 const char *hash = name + 7;
451 unsigned char *buf;
452
453 len = os_strlen(hash) / 2;
454 buf = os_malloc(len);
455 if (buf && hexstr2bin(hash, buf, len) == 0) {
456 blob.cbData = len;
457 blob.pbData = buf;
458 ret = CertFindCertificateInStore(cs,
459 X509_ASN_ENCODING |
460 PKCS_7_ASN_ENCODING,
461 0, CERT_FIND_HASH,
462 &blob, NULL);
463 }
464 os_free(buf);
465 }
466
467 CertCloseStore(cs, 0);
468
469 return ret;
470 }
471
472
473 static int tls_cryptoapi_cert(SSL *ssl, const char *name)
474 {
475 X509 *cert = NULL;
476 RSA *rsa = NULL, *pub_rsa;
477 struct cryptoapi_rsa_data *priv;
478 RSA_METHOD *rsa_meth;
479
480 if (name == NULL ||
481 (strncmp(name, "cert://", 7) != 0 &&
482 strncmp(name, "hash://", 7) != 0))
483 return -1;
484
485 priv = os_zalloc(sizeof(*priv));
486 rsa_meth = os_zalloc(sizeof(*rsa_meth));
487 if (priv == NULL || rsa_meth == NULL) {
488 wpa_printf(MSG_WARNING, "CryptoAPI: Failed to allocate memory "
489 "for CryptoAPI RSA method");
490 os_free(priv);
491 os_free(rsa_meth);
492 return -1;
493 }
494
495 priv->cert = cryptoapi_find_cert(name, CERT_SYSTEM_STORE_CURRENT_USER);
496 if (priv->cert == NULL) {
497 priv->cert = cryptoapi_find_cert(
498 name, CERT_SYSTEM_STORE_LOCAL_MACHINE);
499 }
500 if (priv->cert == NULL) {
501 wpa_printf(MSG_INFO, "CryptoAPI: Could not find certificate "
502 "'%s'", name);
503 goto err;
504 }
505
506 cert = d2i_X509(NULL,
507 (const unsigned char **) &priv->cert->pbCertEncoded,
508 priv->cert->cbCertEncoded);
509 if (cert == NULL) {
510 wpa_printf(MSG_INFO, "CryptoAPI: Could not process X509 DER "
511 "encoding");
512 goto err;
513 }
514
515 if (!CryptAcquireCertificatePrivateKey(priv->cert,
516 CRYPT_ACQUIRE_COMPARE_KEY_FLAG,
517 NULL, &priv->crypt_prov,
518 &priv->key_spec,
519 &priv->free_crypt_prov)) {
520 cryptoapi_error("Failed to acquire a private key for the "
521 "certificate");
522 goto err;
523 }
524
525 rsa_meth->name = "Microsoft CryptoAPI RSA Method";
526 rsa_meth->rsa_pub_enc = cryptoapi_rsa_pub_enc;
527 rsa_meth->rsa_pub_dec = cryptoapi_rsa_pub_dec;
528 rsa_meth->rsa_priv_enc = cryptoapi_rsa_priv_enc;
529 rsa_meth->rsa_priv_dec = cryptoapi_rsa_priv_dec;
530 rsa_meth->finish = cryptoapi_finish;
531 rsa_meth->flags = RSA_METHOD_FLAG_NO_CHECK;
532 rsa_meth->app_data = (char *) priv;
533
534 rsa = RSA_new();
535 if (rsa == NULL) {
536 SSLerr(SSL_F_SSL_CTX_USE_CERTIFICATE_FILE,
537 ERR_R_MALLOC_FAILURE);
538 goto err;
539 }
540
541 if (!SSL_use_certificate(ssl, cert)) {
542 RSA_free(rsa);
543 rsa = NULL;
544 goto err;
545 }
546 pub_rsa = cert->cert_info->key->pkey->pkey.rsa;
547 X509_free(cert);
548 cert = NULL;
549
550 rsa->n = BN_dup(pub_rsa->n);
551 rsa->e = BN_dup(pub_rsa->e);
552 if (!RSA_set_method(rsa, rsa_meth))
553 goto err;
554
555 if (!SSL_use_RSAPrivateKey(ssl, rsa))
556 goto err;
557 RSA_free(rsa);
558
559 return 0;
560
561 err:
562 if (cert)
563 X509_free(cert);
564 if (rsa)
565 RSA_free(rsa);
566 else {
567 os_free(rsa_meth);
568 cryptoapi_free_data(priv);
569 }
570 return -1;
571 }
572
573
574 static int tls_cryptoapi_ca_cert(SSL_CTX *ssl_ctx, SSL *ssl, const char *name)
575 {
576 HCERTSTORE cs;
577 PCCERT_CONTEXT ctx = NULL;
578 X509 *cert;
579 char buf[128];
580 const char *store;
581 #ifdef UNICODE
582 WCHAR *wstore;
583 #endif /* UNICODE */
584
585 if (name == NULL || strncmp(name, "cert_store://", 13) != 0)
586 return -1;
587
588 store = name + 13;
589 #ifdef UNICODE
590 wstore = os_malloc((os_strlen(store) + 1) * sizeof(WCHAR));
591 if (wstore == NULL)
592 return -1;
593 wsprintf(wstore, L"%S", store);
594 cs = CertOpenSystemStore(0, wstore);
595 os_free(wstore);
596 #else /* UNICODE */
597 cs = CertOpenSystemStore(0, store);
598 #endif /* UNICODE */
599 if (cs == NULL) {
600 wpa_printf(MSG_DEBUG, "%s: failed to open system cert store "
601 "'%s': error=%d", __func__, store,
602 (int) GetLastError());
603 return -1;
604 }
605
606 while ((ctx = CertEnumCertificatesInStore(cs, ctx))) {
607 cert = d2i_X509(NULL,
608 (const unsigned char **) &ctx->pbCertEncoded,
609 ctx->cbCertEncoded);
610 if (cert == NULL) {
611 wpa_printf(MSG_INFO, "CryptoAPI: Could not process "
612 "X509 DER encoding for CA cert");
613 continue;
614 }
615
616 X509_NAME_oneline(X509_get_subject_name(cert), buf,
617 sizeof(buf));
618 wpa_printf(MSG_DEBUG, "OpenSSL: Loaded CA certificate for "
619 "system certificate store: subject='%s'", buf);
620
621 if (!X509_STORE_add_cert(ssl_ctx->cert_store, cert)) {
622 tls_show_errors(MSG_WARNING, __func__,
623 "Failed to add ca_cert to OpenSSL "
624 "certificate store");
625 }
626
627 X509_free(cert);
628 }
629
630 if (!CertCloseStore(cs, 0)) {
631 wpa_printf(MSG_DEBUG, "%s: failed to close system cert store "
632 "'%s': error=%d", __func__, name + 13,
633 (int) GetLastError());
634 }
635
636 return 0;
637 }
638
639
640 #else /* CONFIG_NATIVE_WINDOWS */
641
642 static int tls_cryptoapi_cert(SSL *ssl, const char *name)
643 {
644 return -1;
645 }
646
647 #endif /* CONFIG_NATIVE_WINDOWS */
648
649
650 static void ssl_info_cb(const SSL *ssl, int where, int ret)
651 {
652 const char *str;
653 int w;
654
655 wpa_printf(MSG_DEBUG, "SSL: (where=0x%x ret=0x%x)", where, ret);
656 w = where & ~SSL_ST_MASK;
657 if (w & SSL_ST_CONNECT)
658 str = "SSL_connect";
659 else if (w & SSL_ST_ACCEPT)
660 str = "SSL_accept";
661 else
662 str = "undefined";
663
664 if (where & SSL_CB_LOOP) {
665 wpa_printf(MSG_DEBUG, "SSL: %s:%s",
666 str, SSL_state_string_long(ssl));
667 } else if (where & SSL_CB_ALERT) {
668 struct tls_connection *conn = SSL_get_app_data((SSL *) ssl);
669 wpa_printf(MSG_INFO, "SSL: SSL3 alert: %s:%s:%s",
670 where & SSL_CB_READ ?
671 "read (remote end reported an error)" :
672 "write (local SSL3 detected an error)",
673 SSL_alert_type_string_long(ret),
674 SSL_alert_desc_string_long(ret));
675 if ((ret >> 8) == SSL3_AL_FATAL) {
676 if (where & SSL_CB_READ)
677 conn->read_alerts++;
678 else
679 conn->write_alerts++;
680 }
681 if (conn->context->event_cb != NULL) {
682 union tls_event_data ev;
683 struct tls_context *context = conn->context;
684 os_memset(&ev, 0, sizeof(ev));
685 ev.alert.is_local = !(where & SSL_CB_READ);
686 ev.alert.type = SSL_alert_type_string_long(ret);
687 ev.alert.description = SSL_alert_desc_string_long(ret);
688 context->event_cb(context->cb_ctx, TLS_ALERT, &ev);
689 }
690 } else if (where & SSL_CB_EXIT && ret <= 0) {
691 wpa_printf(MSG_DEBUG, "SSL: %s:%s in %s",
692 str, ret == 0 ? "failed" : "error",
693 SSL_state_string_long(ssl));
694 }
695 }
696
697
698 #ifndef OPENSSL_NO_ENGINE
699 /**
700 * tls_engine_load_dynamic_generic - load any openssl engine
701 * @pre: an array of commands and values that load an engine initialized
702 * in the engine specific function
703 * @post: an array of commands and values that initialize an already loaded
704 * engine (or %NULL if not required)
705 * @id: the engine id of the engine to load (only required if post is not %NULL
706 *
707 * This function is a generic function that loads any openssl engine.
708 *
709 * Returns: 0 on success, -1 on failure
710 */
711 static int tls_engine_load_dynamic_generic(const char *pre[],
712 const char *post[], const char *id)
713 {
714 ENGINE *engine;
715 const char *dynamic_id = "dynamic";
716
717 engine = ENGINE_by_id(id);
718 if (engine) {
719 ENGINE_free(engine);
720 wpa_printf(MSG_DEBUG, "ENGINE: engine '%s' is already "
721 "available", id);
722 return 0;
723 }
724 ERR_clear_error();
725
726 engine = ENGINE_by_id(dynamic_id);
727 if (engine == NULL) {
728 wpa_printf(MSG_INFO, "ENGINE: Can't find engine %s [%s]",
729 dynamic_id,
730 ERR_error_string(ERR_get_error(), NULL));
731 return -1;
732 }
733
734 /* Perform the pre commands. This will load the engine. */
735 while (pre && pre[0]) {
736 wpa_printf(MSG_DEBUG, "ENGINE: '%s' '%s'", pre[0], pre[1]);
737 if (ENGINE_ctrl_cmd_string(engine, pre[0], pre[1], 0) == 0) {
738 wpa_printf(MSG_INFO, "ENGINE: ctrl cmd_string failed: "
739 "%s %s [%s]", pre[0], pre[1],
740 ERR_error_string(ERR_get_error(), NULL));
741 ENGINE_free(engine);
742 return -1;
743 }
744 pre += 2;
745 }
746
747 /*
748 * Free the reference to the "dynamic" engine. The loaded engine can
749 * now be looked up using ENGINE_by_id().
750 */
751 ENGINE_free(engine);
752
753 engine = ENGINE_by_id(id);
754 if (engine == NULL) {
755 wpa_printf(MSG_INFO, "ENGINE: Can't find engine %s [%s]",
756 id, ERR_error_string(ERR_get_error(), NULL));
757 return -1;
758 }
759
760 while (post && post[0]) {
761 wpa_printf(MSG_DEBUG, "ENGINE: '%s' '%s'", post[0], post[1]);
762 if (ENGINE_ctrl_cmd_string(engine, post[0], post[1], 0) == 0) {
763 wpa_printf(MSG_DEBUG, "ENGINE: ctrl cmd_string failed:"
764 " %s %s [%s]", post[0], post[1],
765 ERR_error_string(ERR_get_error(), NULL));
766 ENGINE_remove(engine);
767 ENGINE_free(engine);
768 return -1;
769 }
770 post += 2;
771 }
772 ENGINE_free(engine);
773
774 return 0;
775 }
776
777
778 /**
779 * tls_engine_load_dynamic_pkcs11 - load the pkcs11 engine provided by opensc
780 * @pkcs11_so_path: pksc11_so_path from the configuration
781 * @pcks11_module_path: pkcs11_module_path from the configuration
782 */
783 static int tls_engine_load_dynamic_pkcs11(const char *pkcs11_so_path,
784 const char *pkcs11_module_path)
785 {
786 char *engine_id = "pkcs11";
787 const char *pre_cmd[] = {
788 "SO_PATH", NULL /* pkcs11_so_path */,
789 "ID", NULL /* engine_id */,
790 "LIST_ADD", "1",
791 /* "NO_VCHECK", "1", */
792 "LOAD", NULL,
793 NULL, NULL
794 };
795 const char *post_cmd[] = {
796 "MODULE_PATH", NULL /* pkcs11_module_path */,
797 NULL, NULL
798 };
799
800 if (!pkcs11_so_path)
801 return 0;
802
803 pre_cmd[1] = pkcs11_so_path;
804 pre_cmd[3] = engine_id;
805 if (pkcs11_module_path)
806 post_cmd[1] = pkcs11_module_path;
807 else
808 post_cmd[0] = NULL;
809
810 wpa_printf(MSG_DEBUG, "ENGINE: Loading pkcs11 Engine from %s",
811 pkcs11_so_path);
812
813 return tls_engine_load_dynamic_generic(pre_cmd, post_cmd, engine_id);
814 }
815
816
817 /**
818 * tls_engine_load_dynamic_opensc - load the opensc engine provided by opensc
819 * @opensc_so_path: opensc_so_path from the configuration
820 */
821 static int tls_engine_load_dynamic_opensc(const char *opensc_so_path)
822 {
823 char *engine_id = "opensc";
824 const char *pre_cmd[] = {
825 "SO_PATH", NULL /* opensc_so_path */,
826 "ID", NULL /* engine_id */,
827 "LIST_ADD", "1",
828 "LOAD", NULL,
829 NULL, NULL
830 };
831
832 if (!opensc_so_path)
833 return 0;
834
835 pre_cmd[1] = opensc_so_path;
836 pre_cmd[3] = engine_id;
837
838 wpa_printf(MSG_DEBUG, "ENGINE: Loading OpenSC Engine from %s",
839 opensc_so_path);
840
841 return tls_engine_load_dynamic_generic(pre_cmd, NULL, engine_id);
842 }
843 #endif /* OPENSSL_NO_ENGINE */
844
845
846 static void remove_session_cb(SSL_CTX *ctx, SSL_SESSION *sess)
847 {
848 struct wpabuf *buf;
849
850 if (tls_ex_idx_session < 0)
851 return;
852 buf = SSL_SESSION_get_ex_data(sess, tls_ex_idx_session);
853 if (!buf)
854 return;
855 wpa_printf(MSG_DEBUG,
856 "OpenSSL: Free application session data %p (sess %p)",
857 buf, sess);
858 wpabuf_free(buf);
859
860 SSL_SESSION_set_ex_data(sess, tls_ex_idx_session, NULL);
861 }
862
863
864 void * tls_init(const struct tls_config *conf)
865 {
866 struct tls_data *data;
867 SSL_CTX *ssl;
868 struct tls_context *context;
869 const char *ciphers;
870
871 if (tls_openssl_ref_count == 0) {
872 tls_global = context = tls_context_new(conf);
873 if (context == NULL)
874 return NULL;
875 #ifdef CONFIG_FIPS
876 #ifdef OPENSSL_FIPS
877 if (conf && conf->fips_mode) {
878 static int fips_enabled = 0;
879
880 if (!fips_enabled && !FIPS_mode_set(1)) {
881 wpa_printf(MSG_ERROR, "Failed to enable FIPS "
882 "mode");
883 ERR_load_crypto_strings();
884 ERR_print_errors_fp(stderr);
885 os_free(tls_global);
886 tls_global = NULL;
887 return NULL;
888 } else {
889 wpa_printf(MSG_INFO, "Running in FIPS mode");
890 fips_enabled = 1;
891 }
892 }
893 #else /* OPENSSL_FIPS */
894 if (conf && conf->fips_mode) {
895 wpa_printf(MSG_ERROR, "FIPS mode requested, but not "
896 "supported");
897 os_free(tls_global);
898 tls_global = NULL;
899 return NULL;
900 }
901 #endif /* OPENSSL_FIPS */
902 #endif /* CONFIG_FIPS */
903 #if OPENSSL_VERSION_NUMBER < 0x10100000L
904 SSL_load_error_strings();
905 SSL_library_init();
906 #ifndef OPENSSL_NO_SHA256
907 EVP_add_digest(EVP_sha256());
908 #endif /* OPENSSL_NO_SHA256 */
909 /* TODO: if /dev/urandom is available, PRNG is seeded
910 * automatically. If this is not the case, random data should
911 * be added here. */
912
913 #ifdef PKCS12_FUNCS
914 #ifndef OPENSSL_NO_RC2
915 /*
916 * 40-bit RC2 is commonly used in PKCS#12 files, so enable it.
917 * This is enabled by PKCS12_PBE_add() in OpenSSL 0.9.8
918 * versions, but it looks like OpenSSL 1.0.0 does not do that
919 * anymore.
920 */
921 EVP_add_cipher(EVP_rc2_40_cbc());
922 #endif /* OPENSSL_NO_RC2 */
923 PKCS12_PBE_add();
924 #endif /* PKCS12_FUNCS */
925 #endif /* < 1.1.0 */
926 } else {
927 context = tls_context_new(conf);
928 if (context == NULL)
929 return NULL;
930 }
931 tls_openssl_ref_count++;
932
933 data = os_zalloc(sizeof(*data));
934 if (data)
935 ssl = SSL_CTX_new(SSLv23_method());
936 else
937 ssl = NULL;
938 if (ssl == NULL) {
939 tls_openssl_ref_count--;
940 if (context != tls_global)
941 os_free(context);
942 if (tls_openssl_ref_count == 0) {
943 os_free(tls_global);
944 tls_global = NULL;
945 }
946 os_free(data);
947 return NULL;
948 }
949 data->ssl = ssl;
950 if (conf)
951 data->tls_session_lifetime = conf->tls_session_lifetime;
952
953 SSL_CTX_set_options(ssl, SSL_OP_NO_SSLv2);
954 SSL_CTX_set_options(ssl, SSL_OP_NO_SSLv3);
955
956 SSL_CTX_set_info_callback(ssl, ssl_info_cb);
957 SSL_CTX_set_app_data(ssl, context);
958 if (data->tls_session_lifetime > 0) {
959 SSL_CTX_set_quiet_shutdown(ssl, 1);
960 /*
961 * Set default context here. In practice, this will be replaced
962 * by the per-EAP method context in tls_connection_set_verify().
963 */
964 SSL_CTX_set_session_id_context(ssl, (u8 *) "hostapd", 7);
965 SSL_CTX_set_session_cache_mode(ssl, SSL_SESS_CACHE_SERVER);
966 SSL_CTX_set_timeout(ssl, data->tls_session_lifetime);
967 SSL_CTX_sess_set_remove_cb(ssl, remove_session_cb);
968 } else {
969 SSL_CTX_set_session_cache_mode(ssl, SSL_SESS_CACHE_OFF);
970 }
971
972 if (tls_ex_idx_session < 0) {
973 tls_ex_idx_session = SSL_SESSION_get_ex_new_index(
974 0, NULL, NULL, NULL, NULL);
975 if (tls_ex_idx_session < 0) {
976 tls_deinit(data);
977 return NULL;
978 }
979 }
980
981 #ifndef OPENSSL_NO_ENGINE
982 wpa_printf(MSG_DEBUG, "ENGINE: Loading dynamic engine");
983 ERR_load_ENGINE_strings();
984 ENGINE_load_dynamic();
985
986 if (conf &&
987 (conf->opensc_engine_path || conf->pkcs11_engine_path ||
988 conf->pkcs11_module_path)) {
989 if (tls_engine_load_dynamic_opensc(conf->opensc_engine_path) ||
990 tls_engine_load_dynamic_pkcs11(conf->pkcs11_engine_path,
991 conf->pkcs11_module_path)) {
992 tls_deinit(data);
993 return NULL;
994 }
995 }
996 #endif /* OPENSSL_NO_ENGINE */
997
998 if (conf && conf->openssl_ciphers)
999 ciphers = conf->openssl_ciphers;
1000 else
1001 ciphers = "DEFAULT:!EXP:!LOW";
1002 if (SSL_CTX_set_cipher_list(ssl, ciphers) != 1) {
1003 wpa_printf(MSG_ERROR,
1004 "OpenSSL: Failed to set cipher string '%s'",
1005 ciphers);
1006 tls_deinit(data);
1007 return NULL;
1008 }
1009
1010 return data;
1011 }
1012
1013
1014 void tls_deinit(void *ssl_ctx)
1015 {
1016 struct tls_data *data = ssl_ctx;
1017 SSL_CTX *ssl = data->ssl;
1018 struct tls_context *context = SSL_CTX_get_app_data(ssl);
1019 if (context != tls_global)
1020 os_free(context);
1021 if (data->tls_session_lifetime > 0)
1022 SSL_CTX_flush_sessions(ssl, 0);
1023 SSL_CTX_free(ssl);
1024
1025 tls_openssl_ref_count--;
1026 if (tls_openssl_ref_count == 0) {
1027 #if OPENSSL_VERSION_NUMBER < 0x10100000L
1028 #ifndef OPENSSL_NO_ENGINE
1029 ENGINE_cleanup();
1030 #endif /* OPENSSL_NO_ENGINE */
1031 CRYPTO_cleanup_all_ex_data();
1032 ERR_remove_thread_state(NULL);
1033 ERR_free_strings();
1034 EVP_cleanup();
1035 #endif /* < 1.1.0 */
1036 os_free(tls_global->ocsp_stapling_response);
1037 tls_global->ocsp_stapling_response = NULL;
1038 os_free(tls_global);
1039 tls_global = NULL;
1040 }
1041
1042 os_free(data);
1043 }
1044
1045
1046 #ifndef OPENSSL_NO_ENGINE
1047
1048 /* Cryptoki return values */
1049 #define CKR_PIN_INCORRECT 0x000000a0
1050 #define CKR_PIN_INVALID 0x000000a1
1051 #define CKR_PIN_LEN_RANGE 0x000000a2
1052
1053 /* libp11 */
1054 #define ERR_LIB_PKCS11 ERR_LIB_USER
1055
1056 static int tls_is_pin_error(unsigned int err)
1057 {
1058 return ERR_GET_LIB(err) == ERR_LIB_PKCS11 &&
1059 (ERR_GET_REASON(err) == CKR_PIN_INCORRECT ||
1060 ERR_GET_REASON(err) == CKR_PIN_INVALID ||
1061 ERR_GET_REASON(err) == CKR_PIN_LEN_RANGE);
1062 }
1063
1064 #endif /* OPENSSL_NO_ENGINE */
1065
1066
1067 #ifdef ANDROID
1068 /* EVP_PKEY_from_keystore comes from system/security/keystore-engine. */
1069 EVP_PKEY * EVP_PKEY_from_keystore(const char *key_id);
1070 #endif /* ANDROID */
1071
1072 static int tls_engine_init(struct tls_connection *conn, const char *engine_id,
1073 const char *pin, const char *key_id,
1074 const char *cert_id, const char *ca_cert_id)
1075 {
1076 #if defined(ANDROID) && defined(OPENSSL_IS_BORINGSSL)
1077 #if !defined(OPENSSL_NO_ENGINE)
1078 #error "This code depends on OPENSSL_NO_ENGINE being defined by BoringSSL."
1079 #endif
1080 if (!key_id)
1081 return TLS_SET_PARAMS_ENGINE_PRV_INIT_FAILED;
1082 conn->engine = NULL;
1083 conn->private_key = EVP_PKEY_from_keystore(key_id);
1084 if (!conn->private_key) {
1085 wpa_printf(MSG_ERROR,
1086 "ENGINE: cannot load private key with id '%s' [%s]",
1087 key_id,
1088 ERR_error_string(ERR_get_error(), NULL));
1089 return TLS_SET_PARAMS_ENGINE_PRV_INIT_FAILED;
1090 }
1091 #endif /* ANDROID && OPENSSL_IS_BORINGSSL */
1092
1093 #ifndef OPENSSL_NO_ENGINE
1094 int ret = -1;
1095 if (engine_id == NULL) {
1096 wpa_printf(MSG_ERROR, "ENGINE: Engine ID not set");
1097 return -1;
1098 }
1099
1100 ERR_clear_error();
1101 #ifdef ANDROID
1102 ENGINE_load_dynamic();
1103 #endif
1104 conn->engine = ENGINE_by_id(engine_id);
1105 if (!conn->engine) {
1106 wpa_printf(MSG_ERROR, "ENGINE: engine %s not available [%s]",
1107 engine_id, ERR_error_string(ERR_get_error(), NULL));
1108 goto err;
1109 }
1110 if (ENGINE_init(conn->engine) != 1) {
1111 wpa_printf(MSG_ERROR, "ENGINE: engine init failed "
1112 "(engine: %s) [%s]", engine_id,
1113 ERR_error_string(ERR_get_error(), NULL));
1114 goto err;
1115 }
1116 wpa_printf(MSG_DEBUG, "ENGINE: engine initialized");
1117
1118 #ifndef ANDROID
1119 if (pin && ENGINE_ctrl_cmd_string(conn->engine, "PIN", pin, 0) == 0) {
1120 wpa_printf(MSG_ERROR, "ENGINE: cannot set pin [%s]",
1121 ERR_error_string(ERR_get_error(), NULL));
1122 goto err;
1123 }
1124 #endif
1125 if (key_id) {
1126 /*
1127 * Ensure that the ENGINE does not attempt to use the OpenSSL
1128 * UI system to obtain a PIN, if we didn't provide one.
1129 */
1130 struct {
1131 const void *password;
1132 const char *prompt_info;
1133 } key_cb = { "", NULL };
1134
1135 /* load private key first in-case PIN is required for cert */
1136 conn->private_key = ENGINE_load_private_key(conn->engine,
1137 key_id, NULL,
1138 &key_cb);
1139 if (!conn->private_key) {
1140 unsigned long err = ERR_get_error();
1141
1142 wpa_printf(MSG_ERROR,
1143 "ENGINE: cannot load private key with id '%s' [%s]",
1144 key_id,
1145 ERR_error_string(err, NULL));
1146 if (tls_is_pin_error(err))
1147 ret = TLS_SET_PARAMS_ENGINE_PRV_BAD_PIN;
1148 else
1149 ret = TLS_SET_PARAMS_ENGINE_PRV_INIT_FAILED;
1150 goto err;
1151 }
1152 }
1153
1154 /* handle a certificate and/or CA certificate */
1155 if (cert_id || ca_cert_id) {
1156 const char *cmd_name = "LOAD_CERT_CTRL";
1157
1158 /* test if the engine supports a LOAD_CERT_CTRL */
1159 if (!ENGINE_ctrl(conn->engine, ENGINE_CTRL_GET_CMD_FROM_NAME,
1160 0, (void *)cmd_name, NULL)) {
1161 wpa_printf(MSG_ERROR, "ENGINE: engine does not support"
1162 " loading certificates");
1163 ret = TLS_SET_PARAMS_ENGINE_PRV_INIT_FAILED;
1164 goto err;
1165 }
1166 }
1167
1168 return 0;
1169
1170 err:
1171 if (conn->engine) {
1172 ENGINE_free(conn->engine);
1173 conn->engine = NULL;
1174 }
1175
1176 if (conn->private_key) {
1177 EVP_PKEY_free(conn->private_key);
1178 conn->private_key = NULL;
1179 }
1180
1181 return ret;
1182 #else /* OPENSSL_NO_ENGINE */
1183 return 0;
1184 #endif /* OPENSSL_NO_ENGINE */
1185 }
1186
1187
1188 static void tls_engine_deinit(struct tls_connection *conn)
1189 {
1190 #if defined(ANDROID) || !defined(OPENSSL_NO_ENGINE)
1191 wpa_printf(MSG_DEBUG, "ENGINE: engine deinit");
1192 if (conn->private_key) {
1193 EVP_PKEY_free(conn->private_key);
1194 conn->private_key = NULL;
1195 }
1196 if (conn->engine) {
1197 #if !defined(OPENSSL_IS_BORINGSSL)
1198 ENGINE_finish(conn->engine);
1199 #endif /* !OPENSSL_IS_BORINGSSL */
1200 conn->engine = NULL;
1201 }
1202 #endif /* ANDROID || !OPENSSL_NO_ENGINE */
1203 }
1204
1205
1206 int tls_get_errors(void *ssl_ctx)
1207 {
1208 int count = 0;
1209 unsigned long err;
1210
1211 while ((err = ERR_get_error())) {
1212 wpa_printf(MSG_INFO, "TLS - SSL error: %s",
1213 ERR_error_string(err, NULL));
1214 count++;
1215 }
1216
1217 return count;
1218 }
1219
1220
1221 static const char * openssl_content_type(int content_type)
1222 {
1223 switch (content_type) {
1224 case 20:
1225 return "change cipher spec";
1226 case 21:
1227 return "alert";
1228 case 22:
1229 return "handshake";
1230 case 23:
1231 return "application data";
1232 case 24:
1233 return "heartbeat";
1234 case 256:
1235 return "TLS header info"; /* pseudo content type */
1236 default:
1237 return "?";
1238 }
1239 }
1240
1241
1242 static const char * openssl_handshake_type(int content_type, const u8 *buf,
1243 size_t len)
1244 {
1245 if (content_type != 22 || !buf || len == 0)
1246 return "";
1247 switch (buf[0]) {
1248 case 0:
1249 return "hello request";
1250 case 1:
1251 return "client hello";
1252 case 2:
1253 return "server hello";
1254 case 4:
1255 return "new session ticket";
1256 case 11:
1257 return "certificate";
1258 case 12:
1259 return "server key exchange";
1260 case 13:
1261 return "certificate request";
1262 case 14:
1263 return "server hello done";
1264 case 15:
1265 return "certificate verify";
1266 case 16:
1267 return "client key exchange";
1268 case 20:
1269 return "finished";
1270 case 21:
1271 return "certificate url";
1272 case 22:
1273 return "certificate status";
1274 default:
1275 return "?";
1276 }
1277 }
1278
1279
1280 static void tls_msg_cb(int write_p, int version, int content_type,
1281 const void *buf, size_t len, SSL *ssl, void *arg)
1282 {
1283 struct tls_connection *conn = arg;
1284 const u8 *pos = buf;
1285
1286 if (write_p == 2) {
1287 wpa_printf(MSG_DEBUG,
1288 "OpenSSL: session ver=0x%x content_type=%d",
1289 version, content_type);
1290 wpa_hexdump_key(MSG_MSGDUMP, "OpenSSL: Data", buf, len);
1291 return;
1292 }
1293
1294 wpa_printf(MSG_DEBUG, "OpenSSL: %s ver=0x%x content_type=%d (%s/%s)",
1295 write_p ? "TX" : "RX", version, content_type,
1296 openssl_content_type(content_type),
1297 openssl_handshake_type(content_type, buf, len));
1298 wpa_hexdump_key(MSG_MSGDUMP, "OpenSSL: Message", buf, len);
1299 if (content_type == 24 && len >= 3 && pos[0] == 1) {
1300 size_t payload_len = WPA_GET_BE16(pos + 1);
1301 if (payload_len + 3 > len) {
1302 wpa_printf(MSG_ERROR, "OpenSSL: Heartbeat attack detected");
1303 conn->invalid_hb_used = 1;
1304 }
1305 }
1306 }
1307
1308
1309 struct tls_connection * tls_connection_init(void *ssl_ctx)
1310 {
1311 struct tls_data *data = ssl_ctx;
1312 SSL_CTX *ssl = data->ssl;
1313 struct tls_connection *conn;
1314 long options;
1315 struct tls_context *context = SSL_CTX_get_app_data(ssl);
1316
1317 conn = os_zalloc(sizeof(*conn));
1318 if (conn == NULL)
1319 return NULL;
1320 conn->ssl_ctx = ssl;
1321 conn->ssl = SSL_new(ssl);
1322 if (conn->ssl == NULL) {
1323 tls_show_errors(MSG_INFO, __func__,
1324 "Failed to initialize new SSL connection");
1325 os_free(conn);
1326 return NULL;
1327 }
1328
1329 conn->context = context;
1330 SSL_set_app_data(conn->ssl, conn);
1331 SSL_set_msg_callback(conn->ssl, tls_msg_cb);
1332 SSL_set_msg_callback_arg(conn->ssl, conn);
1333 options = SSL_OP_NO_SSLv2 | SSL_OP_NO_SSLv3 |
1334 SSL_OP_SINGLE_DH_USE;
1335 #ifdef SSL_OP_NO_COMPRESSION
1336 options |= SSL_OP_NO_COMPRESSION;
1337 #endif /* SSL_OP_NO_COMPRESSION */
1338 SSL_set_options(conn->ssl, options);
1339
1340 conn->ssl_in = BIO_new(BIO_s_mem());
1341 if (!conn->ssl_in) {
1342 tls_show_errors(MSG_INFO, __func__,
1343 "Failed to create a new BIO for ssl_in");
1344 SSL_free(conn->ssl);
1345 os_free(conn);
1346 return NULL;
1347 }
1348
1349 conn->ssl_out = BIO_new(BIO_s_mem());
1350 if (!conn->ssl_out) {
1351 tls_show_errors(MSG_INFO, __func__,
1352 "Failed to create a new BIO for ssl_out");
1353 SSL_free(conn->ssl);
1354 BIO_free(conn->ssl_in);
1355 os_free(conn);
1356 return NULL;
1357 }
1358
1359 SSL_set_bio(conn->ssl, conn->ssl_in, conn->ssl_out);
1360
1361 return conn;
1362 }
1363
1364
1365 void tls_connection_deinit(void *ssl_ctx, struct tls_connection *conn)
1366 {
1367 if (conn == NULL)
1368 return;
1369 if (conn->success_data) {
1370 /*
1371 * Make sure ssl_clear_bad_session() does not remove this
1372 * session.
1373 */
1374 SSL_set_quiet_shutdown(conn->ssl, 1);
1375 SSL_shutdown(conn->ssl);
1376 }
1377 SSL_free(conn->ssl);
1378 tls_engine_deinit(conn);
1379 os_free(conn->subject_match);
1380 os_free(conn->altsubject_match);
1381 os_free(conn->suffix_match);
1382 os_free(conn->domain_match);
1383 os_free(conn->session_ticket);
1384 os_free(conn);
1385 }
1386
1387
1388 int tls_connection_established(void *ssl_ctx, struct tls_connection *conn)
1389 {
1390 return conn ? SSL_is_init_finished(conn->ssl) : 0;
1391 }
1392
1393
1394 int tls_connection_shutdown(void *ssl_ctx, struct tls_connection *conn)
1395 {
1396 if (conn == NULL)
1397 return -1;
1398
1399 /* Shutdown previous TLS connection without notifying the peer
1400 * because the connection was already terminated in practice
1401 * and "close notify" shutdown alert would confuse AS. */
1402 SSL_set_quiet_shutdown(conn->ssl, 1);
1403 SSL_shutdown(conn->ssl);
1404 return SSL_clear(conn->ssl) == 1 ? 0 : -1;
1405 }
1406
1407
1408 static int tls_match_altsubject_component(X509 *cert, int type,
1409 const char *value, size_t len)
1410 {
1411 GENERAL_NAME *gen;
1412 void *ext;
1413 int found = 0;
1414 stack_index_t i;
1415
1416 ext = X509_get_ext_d2i(cert, NID_subject_alt_name, NULL, NULL);
1417
1418 for (i = 0; ext && i < sk_GENERAL_NAME_num(ext); i++) {
1419 gen = sk_GENERAL_NAME_value(ext, i);
1420 if (gen->type != type)
1421 continue;
1422 if (os_strlen((char *) gen->d.ia5->data) == len &&
1423 os_memcmp(value, gen->d.ia5->data, len) == 0)
1424 found++;
1425 }
1426
1427 sk_GENERAL_NAME_pop_free(ext, GENERAL_NAME_free);
1428
1429 return found;
1430 }
1431
1432
1433 static int tls_match_altsubject(X509 *cert, const char *match)
1434 {
1435 int type;
1436 const char *pos, *end;
1437 size_t len;
1438
1439 pos = match;
1440 do {
1441 if (os_strncmp(pos, "EMAIL:", 6) == 0) {
1442 type = GEN_EMAIL;
1443 pos += 6;
1444 } else if (os_strncmp(pos, "DNS:", 4) == 0) {
1445 type = GEN_DNS;
1446 pos += 4;
1447 } else if (os_strncmp(pos, "URI:", 4) == 0) {
1448 type = GEN_URI;
1449 pos += 4;
1450 } else {
1451 wpa_printf(MSG_INFO, "TLS: Invalid altSubjectName "
1452 "match '%s'", pos);
1453 return 0;
1454 }
1455 end = os_strchr(pos, ';');
1456 while (end) {
1457 if (os_strncmp(end + 1, "EMAIL:", 6) == 0 ||
1458 os_strncmp(end + 1, "DNS:", 4) == 0 ||
1459 os_strncmp(end + 1, "URI:", 4) == 0)
1460 break;
1461 end = os_strchr(end + 1, ';');
1462 }
1463 if (end)
1464 len = end - pos;
1465 else
1466 len = os_strlen(pos);
1467 if (tls_match_altsubject_component(cert, type, pos, len) > 0)
1468 return 1;
1469 pos = end + 1;
1470 } while (end);
1471
1472 return 0;
1473 }
1474
1475
1476 #ifndef CONFIG_NATIVE_WINDOWS
1477 static int domain_suffix_match(const u8 *val, size_t len, const char *match,
1478 int full)
1479 {
1480 size_t i, match_len;
1481
1482 /* Check for embedded nuls that could mess up suffix matching */
1483 for (i = 0; i < len; i++) {
1484 if (val[i] == '\0') {
1485 wpa_printf(MSG_DEBUG, "TLS: Embedded null in a string - reject");
1486 return 0;
1487 }
1488 }
1489
1490 match_len = os_strlen(match);
1491 if (match_len > len || (full && match_len != len))
1492 return 0;
1493
1494 if (os_strncasecmp((const char *) val + len - match_len, match,
1495 match_len) != 0)
1496 return 0; /* no match */
1497
1498 if (match_len == len)
1499 return 1; /* exact match */
1500
1501 if (val[len - match_len - 1] == '.')
1502 return 1; /* full label match completes suffix match */
1503
1504 wpa_printf(MSG_DEBUG, "TLS: Reject due to incomplete label match");
1505 return 0;
1506 }
1507 #endif /* CONFIG_NATIVE_WINDOWS */
1508
1509
1510 static int tls_match_suffix(X509 *cert, const char *match, int full)
1511 {
1512 #ifdef CONFIG_NATIVE_WINDOWS
1513 /* wincrypt.h has conflicting X509_NAME definition */
1514 return -1;
1515 #else /* CONFIG_NATIVE_WINDOWS */
1516 GENERAL_NAME *gen;
1517 void *ext;
1518 int i;
1519 stack_index_t j;
1520 int dns_name = 0;
1521 X509_NAME *name;
1522
1523 wpa_printf(MSG_DEBUG, "TLS: Match domain against %s%s",
1524 full ? "": "suffix ", match);
1525
1526 ext = X509_get_ext_d2i(cert, NID_subject_alt_name, NULL, NULL);
1527
1528 for (j = 0; ext && j < sk_GENERAL_NAME_num(ext); j++) {
1529 gen = sk_GENERAL_NAME_value(ext, j);
1530 if (gen->type != GEN_DNS)
1531 continue;
1532 dns_name++;
1533 wpa_hexdump_ascii(MSG_DEBUG, "TLS: Certificate dNSName",
1534 gen->d.dNSName->data,
1535 gen->d.dNSName->length);
1536 if (domain_suffix_match(gen->d.dNSName->data,
1537 gen->d.dNSName->length, match, full) ==
1538 1) {
1539 wpa_printf(MSG_DEBUG, "TLS: %s in dNSName found",
1540 full ? "Match" : "Suffix match");
1541 sk_GENERAL_NAME_pop_free(ext, GENERAL_NAME_free);
1542 return 1;
1543 }
1544 }
1545 sk_GENERAL_NAME_pop_free(ext, GENERAL_NAME_free);
1546
1547 if (dns_name) {
1548 wpa_printf(MSG_DEBUG, "TLS: None of the dNSName(s) matched");
1549 return 0;
1550 }
1551
1552 name = X509_get_subject_name(cert);
1553 i = -1;
1554 for (;;) {
1555 X509_NAME_ENTRY *e;
1556 ASN1_STRING *cn;
1557
1558 i = X509_NAME_get_index_by_NID(name, NID_commonName, i);
1559 if (i == -1)
1560 break;
1561 e = X509_NAME_get_entry(name, i);
1562 if (e == NULL)
1563 continue;
1564 cn = X509_NAME_ENTRY_get_data(e);
1565 if (cn == NULL)
1566 continue;
1567 wpa_hexdump_ascii(MSG_DEBUG, "TLS: Certificate commonName",
1568 cn->data, cn->length);
1569 if (domain_suffix_match(cn->data, cn->length, match, full) == 1)
1570 {
1571 wpa_printf(MSG_DEBUG, "TLS: %s in commonName found",
1572 full ? "Match" : "Suffix match");
1573 return 1;
1574 }
1575 }
1576
1577 wpa_printf(MSG_DEBUG, "TLS: No CommonName %smatch found",
1578 full ? "": "suffix ");
1579 return 0;
1580 #endif /* CONFIG_NATIVE_WINDOWS */
1581 }
1582
1583
1584 static enum tls_fail_reason openssl_tls_fail_reason(int err)
1585 {
1586 switch (err) {
1587 case X509_V_ERR_CERT_REVOKED:
1588 return TLS_FAIL_REVOKED;
1589 case X509_V_ERR_CERT_NOT_YET_VALID:
1590 case X509_V_ERR_CRL_NOT_YET_VALID:
1591 return TLS_FAIL_NOT_YET_VALID;
1592 case X509_V_ERR_CERT_HAS_EXPIRED:
1593 case X509_V_ERR_CRL_HAS_EXPIRED:
1594 return TLS_FAIL_EXPIRED;
1595 case X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT:
1596 case X509_V_ERR_UNABLE_TO_GET_CRL:
1597 case X509_V_ERR_UNABLE_TO_GET_CRL_ISSUER:
1598 case X509_V_ERR_SELF_SIGNED_CERT_IN_CHAIN:
1599 case X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT_LOCALLY:
1600 case X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT:
1601 case X509_V_ERR_UNABLE_TO_VERIFY_LEAF_SIGNATURE:
1602 case X509_V_ERR_CERT_CHAIN_TOO_LONG:
1603 case X509_V_ERR_PATH_LENGTH_EXCEEDED:
1604 case X509_V_ERR_INVALID_CA:
1605 return TLS_FAIL_UNTRUSTED;
1606 case X509_V_ERR_UNABLE_TO_DECRYPT_CERT_SIGNATURE:
1607 case X509_V_ERR_UNABLE_TO_DECRYPT_CRL_SIGNATURE:
1608 case X509_V_ERR_UNABLE_TO_DECODE_ISSUER_PUBLIC_KEY:
1609 case X509_V_ERR_ERROR_IN_CERT_NOT_BEFORE_FIELD:
1610 case X509_V_ERR_ERROR_IN_CERT_NOT_AFTER_FIELD:
1611 case X509_V_ERR_ERROR_IN_CRL_LAST_UPDATE_FIELD:
1612 case X509_V_ERR_ERROR_IN_CRL_NEXT_UPDATE_FIELD:
1613 case X509_V_ERR_CERT_UNTRUSTED:
1614 case X509_V_ERR_CERT_REJECTED:
1615 return TLS_FAIL_BAD_CERTIFICATE;
1616 default:
1617 return TLS_FAIL_UNSPECIFIED;
1618 }
1619 }
1620
1621
1622 static struct wpabuf * get_x509_cert(X509 *cert)
1623 {
1624 struct wpabuf *buf;
1625 u8 *tmp;
1626
1627 int cert_len = i2d_X509(cert, NULL);
1628 if (cert_len <= 0)
1629 return NULL;
1630
1631 buf = wpabuf_alloc(cert_len);
1632 if (buf == NULL)
1633 return NULL;
1634
1635 tmp = wpabuf_put(buf, cert_len);
1636 i2d_X509(cert, &tmp);
1637 return buf;
1638 }
1639
1640
1641 static void openssl_tls_fail_event(struct tls_connection *conn,
1642 X509 *err_cert, int err, int depth,
1643 const char *subject, const char *err_str,
1644 enum tls_fail_reason reason)
1645 {
1646 union tls_event_data ev;
1647 struct wpabuf *cert = NULL;
1648 struct tls_context *context = conn->context;
1649
1650 if (context->event_cb == NULL)
1651 return;
1652
1653 cert = get_x509_cert(err_cert);
1654 os_memset(&ev, 0, sizeof(ev));
1655 ev.cert_fail.reason = reason != TLS_FAIL_UNSPECIFIED ?
1656 reason : openssl_tls_fail_reason(err);
1657 ev.cert_fail.depth = depth;
1658 ev.cert_fail.subject = subject;
1659 ev.cert_fail.reason_txt = err_str;
1660 ev.cert_fail.cert = cert;
1661 context->event_cb(context->cb_ctx, TLS_CERT_CHAIN_FAILURE, &ev);
1662 wpabuf_free(cert);
1663 }
1664
1665
1666 static void openssl_tls_cert_event(struct tls_connection *conn,
1667 X509 *err_cert, int depth,
1668 const char *subject)
1669 {
1670 struct wpabuf *cert = NULL;
1671 union tls_event_data ev;
1672 struct tls_context *context = conn->context;
1673 char *altsubject[TLS_MAX_ALT_SUBJECT];
1674 int alt, num_altsubject = 0;
1675 GENERAL_NAME *gen;
1676 void *ext;
1677 stack_index_t i;
1678 #ifdef CONFIG_SHA256
1679 u8 hash[32];
1680 #endif /* CONFIG_SHA256 */
1681
1682 if (context->event_cb == NULL)
1683 return;
1684
1685 os_memset(&ev, 0, sizeof(ev));
1686 if (conn->cert_probe || (conn->flags & TLS_CONN_EXT_CERT_CHECK) ||
1687 context->cert_in_cb) {
1688 cert = get_x509_cert(err_cert);
1689 ev.peer_cert.cert = cert;
1690 }
1691 #ifdef CONFIG_SHA256
1692 if (cert) {
1693 const u8 *addr[1];
1694 size_t len[1];
1695 addr[0] = wpabuf_head(cert);
1696 len[0] = wpabuf_len(cert);
1697 if (sha256_vector(1, addr, len, hash) == 0) {
1698 ev.peer_cert.hash = hash;
1699 ev.peer_cert.hash_len = sizeof(hash);
1700 }
1701 }
1702 #endif /* CONFIG_SHA256 */
1703 ev.peer_cert.depth = depth;
1704 ev.peer_cert.subject = subject;
1705
1706 ext = X509_get_ext_d2i(err_cert, NID_subject_alt_name, NULL, NULL);
1707 for (i = 0; ext && i < sk_GENERAL_NAME_num(ext); i++) {
1708 char *pos;
1709
1710 if (num_altsubject == TLS_MAX_ALT_SUBJECT)
1711 break;
1712 gen = sk_GENERAL_NAME_value(ext, i);
1713 if (gen->type != GEN_EMAIL &&
1714 gen->type != GEN_DNS &&
1715 gen->type != GEN_URI)
1716 continue;
1717
1718 pos = os_malloc(10 + gen->d.ia5->length + 1);
1719 if (pos == NULL)
1720 break;
1721 altsubject[num_altsubject++] = pos;
1722
1723 switch (gen->type) {
1724 case GEN_EMAIL:
1725 os_memcpy(pos, "EMAIL:", 6);
1726 pos += 6;
1727 break;
1728 case GEN_DNS:
1729 os_memcpy(pos, "DNS:", 4);
1730 pos += 4;
1731 break;
1732 case GEN_URI:
1733 os_memcpy(pos, "URI:", 4);
1734 pos += 4;
1735 break;
1736 }
1737
1738 os_memcpy(pos, gen->d.ia5->data, gen->d.ia5->length);
1739 pos += gen->d.ia5->length;
1740 *pos = '\0';
1741 }
1742 sk_GENERAL_NAME_pop_free(ext, GENERAL_NAME_free);
1743
1744 for (alt = 0; alt < num_altsubject; alt++)
1745 ev.peer_cert.altsubject[alt] = altsubject[alt];
1746 ev.peer_cert.num_altsubject = num_altsubject;
1747
1748 context->event_cb(context->cb_ctx, TLS_PEER_CERTIFICATE, &ev);
1749 wpabuf_free(cert);
1750 for (alt = 0; alt < num_altsubject; alt++)
1751 os_free(altsubject[alt]);
1752 }
1753
1754
1755 static int tls_verify_cb(int preverify_ok, X509_STORE_CTX *x509_ctx)
1756 {
1757 char buf[256];
1758 X509 *err_cert;
1759 int err, depth;
1760 SSL *ssl;
1761 struct tls_connection *conn;
1762 struct tls_context *context;
1763 char *match, *altmatch, *suffix_match, *domain_match;
1764 const char *err_str;
1765
1766 err_cert = X509_STORE_CTX_get_current_cert(x509_ctx);
1767 if (!err_cert)
1768 return 0;
1769
1770 err = X509_STORE_CTX_get_error(x509_ctx);
1771 depth = X509_STORE_CTX_get_error_depth(x509_ctx);
1772 ssl = X509_STORE_CTX_get_ex_data(x509_ctx,
1773 SSL_get_ex_data_X509_STORE_CTX_idx());
1774 X509_NAME_oneline(X509_get_subject_name(err_cert), buf, sizeof(buf));
1775
1776 conn = SSL_get_app_data(ssl);
1777 if (conn == NULL)
1778 return 0;
1779
1780 if (depth == 0)
1781 conn->peer_cert = err_cert;
1782 else if (depth == 1)
1783 conn->peer_issuer = err_cert;
1784 else if (depth == 2)
1785 conn->peer_issuer_issuer = err_cert;
1786
1787 context = conn->context;
1788 match = conn->subject_match;
1789 altmatch = conn->altsubject_match;
1790 suffix_match = conn->suffix_match;
1791 domain_match = conn->domain_match;
1792
1793 if (!preverify_ok && !conn->ca_cert_verify)
1794 preverify_ok = 1;
1795 if (!preverify_ok && depth > 0 && conn->server_cert_only)
1796 preverify_ok = 1;
1797 if (!preverify_ok && (conn->flags & TLS_CONN_DISABLE_TIME_CHECKS) &&
1798 (err == X509_V_ERR_CERT_HAS_EXPIRED ||
1799 err == X509_V_ERR_CERT_NOT_YET_VALID)) {
1800 wpa_printf(MSG_DEBUG, "OpenSSL: Ignore certificate validity "
1801 "time mismatch");
1802 preverify_ok = 1;
1803 }
1804
1805 err_str = X509_verify_cert_error_string(err);
1806
1807 #ifdef CONFIG_SHA256
1808 /*
1809 * Do not require preverify_ok so we can explicity allow otherwise
1810 * invalid pinned server certificates.
1811 */
1812 if (depth == 0 && conn->server_cert_only) {
1813 struct wpabuf *cert;
1814 cert = get_x509_cert(err_cert);
1815 if (!cert) {
1816 wpa_printf(MSG_DEBUG, "OpenSSL: Could not fetch "
1817 "server certificate data");
1818 preverify_ok = 0;
1819 } else {
1820 u8 hash[32];
1821 const u8 *addr[1];
1822 size_t len[1];
1823 addr[0] = wpabuf_head(cert);
1824 len[0] = wpabuf_len(cert);
1825 if (sha256_vector(1, addr, len, hash) < 0 ||
1826 os_memcmp(conn->srv_cert_hash, hash, 32) != 0) {
1827 err_str = "Server certificate mismatch";
1828 err = X509_V_ERR_SELF_SIGNED_CERT_IN_CHAIN;
1829 preverify_ok = 0;
1830 } else if (!preverify_ok) {
1831 /*
1832 * Certificate matches pinned certificate, allow
1833 * regardless of other problems.
1834 */
1835 wpa_printf(MSG_DEBUG,
1836 "OpenSSL: Ignore validation issues for a pinned server certificate");
1837 preverify_ok = 1;
1838 }
1839 wpabuf_free(cert);
1840 }
1841 }
1842 #endif /* CONFIG_SHA256 */
1843
1844 if (!preverify_ok) {
1845 wpa_printf(MSG_WARNING, "TLS: Certificate verification failed,"
1846 " error %d (%s) depth %d for '%s'", err, err_str,
1847 depth, buf);
1848 openssl_tls_fail_event(conn, err_cert, err, depth, buf,
1849 err_str, TLS_FAIL_UNSPECIFIED);
1850 return preverify_ok;
1851 }
1852
1853 wpa_printf(MSG_DEBUG, "TLS: tls_verify_cb - preverify_ok=%d "
1854 "err=%d (%s) ca_cert_verify=%d depth=%d buf='%s'",
1855 preverify_ok, err, err_str,
1856 conn->ca_cert_verify, depth, buf);
1857 if (depth == 0 && match && os_strstr(buf, match) == NULL) {
1858 wpa_printf(MSG_WARNING, "TLS: Subject '%s' did not "
1859 "match with '%s'", buf, match);
1860 preverify_ok = 0;
1861 openssl_tls_fail_event(conn, err_cert, err, depth, buf,
1862 "Subject mismatch",
1863 TLS_FAIL_SUBJECT_MISMATCH);
1864 } else if (depth == 0 && altmatch &&
1865 !tls_match_altsubject(err_cert, altmatch)) {
1866 wpa_printf(MSG_WARNING, "TLS: altSubjectName match "
1867 "'%s' not found", altmatch);
1868 preverify_ok = 0;
1869 openssl_tls_fail_event(conn, err_cert, err, depth, buf,
1870 "AltSubject mismatch",
1871 TLS_FAIL_ALTSUBJECT_MISMATCH);
1872 } else if (depth == 0 && suffix_match &&
1873 !tls_match_suffix(err_cert, suffix_match, 0)) {
1874 wpa_printf(MSG_WARNING, "TLS: Domain suffix match '%s' not found",
1875 suffix_match);
1876 preverify_ok = 0;
1877 openssl_tls_fail_event(conn, err_cert, err, depth, buf,
1878 "Domain suffix mismatch",
1879 TLS_FAIL_DOMAIN_SUFFIX_MISMATCH);
1880 } else if (depth == 0 && domain_match &&
1881 !tls_match_suffix(err_cert, domain_match, 1)) {
1882 wpa_printf(MSG_WARNING, "TLS: Domain match '%s' not found",
1883 domain_match);
1884 preverify_ok = 0;
1885 openssl_tls_fail_event(conn, err_cert, err, depth, buf,
1886 "Domain mismatch",
1887 TLS_FAIL_DOMAIN_MISMATCH);
1888 } else
1889 openssl_tls_cert_event(conn, err_cert, depth, buf);
1890
1891 if (conn->cert_probe && preverify_ok && depth == 0) {
1892 wpa_printf(MSG_DEBUG, "OpenSSL: Reject server certificate "
1893 "on probe-only run");
1894 preverify_ok = 0;
1895 openssl_tls_fail_event(conn, err_cert, err, depth, buf,
1896 "Server certificate chain probe",
1897 TLS_FAIL_SERVER_CHAIN_PROBE);
1898 }
1899
1900 #ifdef OPENSSL_IS_BORINGSSL
1901 if (depth == 0 && (conn->flags & TLS_CONN_REQUEST_OCSP) &&
1902 preverify_ok) {
1903 enum ocsp_result res;
1904
1905 res = check_ocsp_resp(conn->ssl_ctx, conn->ssl, err_cert,
1906 conn->peer_issuer,
1907 conn->peer_issuer_issuer);
1908 if (res == OCSP_REVOKED) {
1909 preverify_ok = 0;
1910 openssl_tls_fail_event(conn, err_cert, err, depth, buf,
1911 "certificate revoked",
1912 TLS_FAIL_REVOKED);
1913 if (err == X509_V_OK)
1914 X509_STORE_CTX_set_error(
1915 x509_ctx, X509_V_ERR_CERT_REVOKED);
1916 } else if (res != OCSP_GOOD &&
1917 (conn->flags & TLS_CONN_REQUIRE_OCSP)) {
1918 preverify_ok = 0;
1919 openssl_tls_fail_event(conn, err_cert, err, depth, buf,
1920 "bad certificate status response",
1921 TLS_FAIL_UNSPECIFIED);
1922 }
1923 }
1924 #endif /* OPENSSL_IS_BORINGSSL */
1925
1926 if (depth == 0 && preverify_ok && context->event_cb != NULL)
1927 context->event_cb(context->cb_ctx,
1928 TLS_CERT_CHAIN_SUCCESS, NULL);
1929
1930 return preverify_ok;
1931 }
1932
1933
1934 #ifndef OPENSSL_NO_STDIO
1935 static int tls_load_ca_der(struct tls_data *data, const char *ca_cert)
1936 {
1937 SSL_CTX *ssl_ctx = data->ssl;
1938 X509_LOOKUP *lookup;
1939 int ret = 0;
1940
1941 lookup = X509_STORE_add_lookup(SSL_CTX_get_cert_store(ssl_ctx),
1942 X509_LOOKUP_file());
1943 if (lookup == NULL) {
1944 tls_show_errors(MSG_WARNING, __func__,
1945 "Failed add lookup for X509 store");
1946 return -1;
1947 }
1948
1949 if (!X509_LOOKUP_load_file(lookup, ca_cert, X509_FILETYPE_ASN1)) {
1950 unsigned long err = ERR_peek_error();
1951 tls_show_errors(MSG_WARNING, __func__,
1952 "Failed load CA in DER format");
1953 if (ERR_GET_LIB(err) == ERR_LIB_X509 &&
1954 ERR_GET_REASON(err) == X509_R_CERT_ALREADY_IN_HASH_TABLE) {
1955 wpa_printf(MSG_DEBUG, "OpenSSL: %s - ignoring "
1956 "cert already in hash table error",
1957 __func__);
1958 } else
1959 ret = -1;
1960 }
1961
1962 return ret;
1963 }
1964 #endif /* OPENSSL_NO_STDIO */
1965
1966
1967 static int tls_connection_ca_cert(struct tls_data *data,
1968 struct tls_connection *conn,
1969 const char *ca_cert, const u8 *ca_cert_blob,
1970 size_t ca_cert_blob_len, const char *ca_path)
1971 {
1972 SSL_CTX *ssl_ctx = data->ssl;
1973 X509_STORE *store;
1974
1975 /*
1976 * Remove previously configured trusted CA certificates before adding
1977 * new ones.
1978 */
1979 store = X509_STORE_new();
1980 if (store == NULL) {
1981 wpa_printf(MSG_DEBUG, "OpenSSL: %s - failed to allocate new "
1982 "certificate store", __func__);
1983 return -1;
1984 }
1985 SSL_CTX_set_cert_store(ssl_ctx, store);
1986
1987 SSL_set_verify(conn->ssl, SSL_VERIFY_PEER, tls_verify_cb);
1988 conn->ca_cert_verify = 1;
1989
1990 if (ca_cert && os_strncmp(ca_cert, "probe://", 8) == 0) {
1991 wpa_printf(MSG_DEBUG, "OpenSSL: Probe for server certificate "
1992 "chain");
1993 conn->cert_probe = 1;
1994 conn->ca_cert_verify = 0;
1995 return 0;
1996 }
1997
1998 if (ca_cert && os_strncmp(ca_cert, "hash://", 7) == 0) {
1999 #ifdef CONFIG_SHA256
2000 const char *pos = ca_cert + 7;
2001 if (os_strncmp(pos, "server/sha256/", 14) != 0) {
2002 wpa_printf(MSG_DEBUG, "OpenSSL: Unsupported ca_cert "
2003 "hash value '%s'", ca_cert);
2004 return -1;
2005 }
2006 pos += 14;
2007 if (os_strlen(pos) != 32 * 2) {
2008 wpa_printf(MSG_DEBUG, "OpenSSL: Unexpected SHA256 "
2009 "hash length in ca_cert '%s'", ca_cert);
2010 return -1;
2011 }
2012 if (hexstr2bin(pos, conn->srv_cert_hash, 32) < 0) {
2013 wpa_printf(MSG_DEBUG, "OpenSSL: Invalid SHA256 hash "
2014 "value in ca_cert '%s'", ca_cert);
2015 return -1;
2016 }
2017 conn->server_cert_only = 1;
2018 wpa_printf(MSG_DEBUG, "OpenSSL: Checking only server "
2019 "certificate match");
2020 return 0;
2021 #else /* CONFIG_SHA256 */
2022 wpa_printf(MSG_INFO, "No SHA256 included in the build - "
2023 "cannot validate server certificate hash");
2024 return -1;
2025 #endif /* CONFIG_SHA256 */
2026 }
2027
2028 if (ca_cert_blob) {
2029 X509 *cert = d2i_X509(NULL,
2030 (const unsigned char **) &ca_cert_blob,
2031 ca_cert_blob_len);
2032 if (cert == NULL) {
2033 tls_show_errors(MSG_WARNING, __func__,
2034 "Failed to parse ca_cert_blob");
2035 return -1;
2036 }
2037
2038 if (!X509_STORE_add_cert(SSL_CTX_get_cert_store(ssl_ctx),
2039 cert)) {
2040 unsigned long err = ERR_peek_error();
2041 tls_show_errors(MSG_WARNING, __func__,
2042 "Failed to add ca_cert_blob to "
2043 "certificate store");
2044 if (ERR_GET_LIB(err) == ERR_LIB_X509 &&
2045 ERR_GET_REASON(err) ==
2046 X509_R_CERT_ALREADY_IN_HASH_TABLE) {
2047 wpa_printf(MSG_DEBUG, "OpenSSL: %s - ignoring "
2048 "cert already in hash table error",
2049 __func__);
2050 } else {
2051 X509_free(cert);
2052 return -1;
2053 }
2054 }
2055 X509_free(cert);
2056 wpa_printf(MSG_DEBUG, "OpenSSL: %s - added ca_cert_blob "
2057 "to certificate store", __func__);
2058 return 0;
2059 }
2060
2061 #ifdef ANDROID
2062 /* Single alias */
2063 if (ca_cert && os_strncmp("keystore://", ca_cert, 11) == 0) {
2064 if (tls_add_ca_from_keystore(ssl_ctx->cert_store,
2065 &ca_cert[11]) < 0)
2066 return -1;
2067 SSL_set_verify(conn->ssl, SSL_VERIFY_PEER, tls_verify_cb);
2068 return 0;
2069 }
2070
2071 /* Multiple aliases separated by space */
2072 if (ca_cert && os_strncmp("keystores://", ca_cert, 12) == 0) {
2073 char *aliases = os_strdup(&ca_cert[12]);
2074 const char *delim = " ";
2075 int rc = 0;
2076 char *savedptr;
2077 char *alias;
2078
2079 if (!aliases)
2080 return -1;
2081 alias = strtok_r(aliases, delim, &savedptr);
2082 for (; alias; alias = strtok_r(NULL, delim, &savedptr)) {
2083 if (tls_add_ca_from_keystore_encoded(
2084 ssl_ctx->cert_store, alias)) {
2085 wpa_printf(MSG_WARNING,
2086 "OpenSSL: %s - Failed to add ca_cert %s from keystore",
2087 __func__, alias);
2088 rc = -1;
2089 break;
2090 }
2091 }
2092 os_free(aliases);
2093 if (rc)
2094 return rc;
2095
2096 SSL_set_verify(conn->ssl, SSL_VERIFY_PEER, tls_verify_cb);
2097 return 0;
2098 }
2099 #endif /* ANDROID */
2100
2101 #ifdef CONFIG_NATIVE_WINDOWS
2102 if (ca_cert && tls_cryptoapi_ca_cert(ssl_ctx, conn->ssl, ca_cert) ==
2103 0) {
2104 wpa_printf(MSG_DEBUG, "OpenSSL: Added CA certificates from "
2105 "system certificate store");
2106 return 0;
2107 }
2108 #endif /* CONFIG_NATIVE_WINDOWS */
2109
2110 if (ca_cert || ca_path) {
2111 #ifndef OPENSSL_NO_STDIO
2112 if (SSL_CTX_load_verify_locations(ssl_ctx, ca_cert, ca_path) !=
2113 1) {
2114 tls_show_errors(MSG_WARNING, __func__,
2115 "Failed to load root certificates");
2116 if (ca_cert &&
2117 tls_load_ca_der(data, ca_cert) == 0) {
2118 wpa_printf(MSG_DEBUG, "OpenSSL: %s - loaded "
2119 "DER format CA certificate",
2120 __func__);
2121 } else
2122 return -1;
2123 } else {
2124 wpa_printf(MSG_DEBUG, "TLS: Trusted root "
2125 "certificate(s) loaded");
2126 tls_get_errors(data);
2127 }
2128 #else /* OPENSSL_NO_STDIO */
2129 wpa_printf(MSG_DEBUG, "OpenSSL: %s - OPENSSL_NO_STDIO",
2130 __func__);
2131 return -1;
2132 #endif /* OPENSSL_NO_STDIO */
2133 } else {
2134 /* No ca_cert configured - do not try to verify server
2135 * certificate */
2136 conn->ca_cert_verify = 0;
2137 }
2138
2139 return 0;
2140 }
2141
2142
2143 static int tls_global_ca_cert(struct tls_data *data, const char *ca_cert)
2144 {
2145 SSL_CTX *ssl_ctx = data->ssl;
2146
2147 if (ca_cert) {
2148 if (SSL_CTX_load_verify_locations(ssl_ctx, ca_cert, NULL) != 1)
2149 {
2150 tls_show_errors(MSG_WARNING, __func__,
2151 "Failed to load root certificates");
2152 return -1;
2153 }
2154
2155 wpa_printf(MSG_DEBUG, "TLS: Trusted root "
2156 "certificate(s) loaded");
2157
2158 #ifndef OPENSSL_NO_STDIO
2159 /* Add the same CAs to the client certificate requests */
2160 SSL_CTX_set_client_CA_list(ssl_ctx,
2161 SSL_load_client_CA_file(ca_cert));
2162 #endif /* OPENSSL_NO_STDIO */
2163 }
2164
2165 return 0;
2166 }
2167
2168
2169 int tls_global_set_verify(void *ssl_ctx, int check_crl)
2170 {
2171 int flags;
2172
2173 if (check_crl) {
2174 struct tls_data *data = ssl_ctx;
2175 X509_STORE *cs = SSL_CTX_get_cert_store(data->ssl);
2176 if (cs == NULL) {
2177 tls_show_errors(MSG_INFO, __func__, "Failed to get "
2178 "certificate store when enabling "
2179 "check_crl");
2180 return -1;
2181 }
2182 flags = X509_V_FLAG_CRL_CHECK;
2183 if (check_crl == 2)
2184 flags |= X509_V_FLAG_CRL_CHECK_ALL;
2185 X509_STORE_set_flags(cs, flags);
2186 }
2187 return 0;
2188 }
2189
2190
2191 static int tls_connection_set_subject_match(struct tls_connection *conn,
2192 const char *subject_match,
2193 const char *altsubject_match,
2194 const char *suffix_match,
2195 const char *domain_match)
2196 {
2197 os_free(conn->subject_match);
2198 conn->subject_match = NULL;
2199 if (subject_match) {
2200 conn->subject_match = os_strdup(subject_match);
2201 if (conn->subject_match == NULL)
2202 return -1;
2203 }
2204
2205 os_free(conn->altsubject_match);
2206 conn->altsubject_match = NULL;
2207 if (altsubject_match) {
2208 conn->altsubject_match = os_strdup(altsubject_match);
2209 if (conn->altsubject_match == NULL)
2210 return -1;
2211 }
2212
2213 os_free(conn->suffix_match);
2214 conn->suffix_match = NULL;
2215 if (suffix_match) {
2216 conn->suffix_match = os_strdup(suffix_match);
2217 if (conn->suffix_match == NULL)
2218 return -1;
2219 }
2220
2221 os_free(conn->domain_match);
2222 conn->domain_match = NULL;
2223 if (domain_match) {
2224 conn->domain_match = os_strdup(domain_match);
2225 if (conn->domain_match == NULL)
2226 return -1;
2227 }
2228
2229 return 0;
2230 }
2231
2232
2233 static void tls_set_conn_flags(SSL *ssl, unsigned int flags)
2234 {
2235 #ifdef SSL_OP_NO_TICKET
2236 if (flags & TLS_CONN_DISABLE_SESSION_TICKET)
2237 SSL_set_options(ssl, SSL_OP_NO_TICKET);
2238 #ifdef SSL_clear_options
2239 else
2240 SSL_clear_options(ssl, SSL_OP_NO_TICKET);
2241 #endif /* SSL_clear_options */
2242 #endif /* SSL_OP_NO_TICKET */
2243
2244 #ifdef SSL_OP_NO_TLSv1
2245 if (flags & TLS_CONN_DISABLE_TLSv1_0)
2246 SSL_set_options(ssl, SSL_OP_NO_TLSv1);
2247 else
2248 SSL_clear_options(ssl, SSL_OP_NO_TLSv1);
2249 #endif /* SSL_OP_NO_TLSv1 */
2250 #ifdef SSL_OP_NO_TLSv1_1
2251 if (flags & TLS_CONN_DISABLE_TLSv1_1)
2252 SSL_set_options(ssl, SSL_OP_NO_TLSv1_1);
2253 else
2254 SSL_clear_options(ssl, SSL_OP_NO_TLSv1_1);
2255 #endif /* SSL_OP_NO_TLSv1_1 */
2256 #ifdef SSL_OP_NO_TLSv1_2
2257 if (flags & TLS_CONN_DISABLE_TLSv1_2)
2258 SSL_set_options(ssl, SSL_OP_NO_TLSv1_2);
2259 else
2260 SSL_clear_options(ssl, SSL_OP_NO_TLSv1_2);
2261 #endif /* SSL_OP_NO_TLSv1_2 */
2262 }
2263
2264
2265 int tls_connection_set_verify(void *ssl_ctx, struct tls_connection *conn,
2266 int verify_peer, unsigned int flags,
2267 const u8 *session_ctx, size_t session_ctx_len)
2268 {
2269 static int counter = 0;
2270 struct tls_data *data = ssl_ctx;
2271
2272 if (conn == NULL)
2273 return -1;
2274
2275 if (verify_peer) {
2276 conn->ca_cert_verify = 1;
2277 SSL_set_verify(conn->ssl, SSL_VERIFY_PEER |
2278 SSL_VERIFY_FAIL_IF_NO_PEER_CERT |
2279 SSL_VERIFY_CLIENT_ONCE, tls_verify_cb);
2280 } else {
2281 conn->ca_cert_verify = 0;
2282 SSL_set_verify(conn->ssl, SSL_VERIFY_NONE, NULL);
2283 }
2284
2285 tls_set_conn_flags(conn->ssl, flags);
2286 conn->flags = flags;
2287
2288 SSL_set_accept_state(conn->ssl);
2289
2290 if (data->tls_session_lifetime == 0) {
2291 /*
2292 * Set session id context to a unique value to make sure
2293 * session resumption cannot be used either through session
2294 * caching or TLS ticket extension.
2295 */
2296 counter++;
2297 SSL_set_session_id_context(conn->ssl,
2298 (const unsigned char *) &counter,
2299 sizeof(counter));
2300 } else if (session_ctx) {
2301 SSL_set_session_id_context(conn->ssl, session_ctx,
2302 session_ctx_len);
2303 }
2304
2305 return 0;
2306 }
2307
2308
2309 static int tls_connection_client_cert(struct tls_connection *conn,
2310 const char *client_cert,
2311 const u8 *client_cert_blob,
2312 size_t client_cert_blob_len)
2313 {
2314 if (client_cert == NULL && client_cert_blob == NULL)
2315 return 0;
2316
2317 #ifdef PKCS12_FUNCS
2318 #if OPENSSL_VERSION_NUMBER < 0x10002000L
2319 /*
2320 * Clear previously set extra chain certificates, if any, from PKCS#12
2321 * processing in tls_parse_pkcs12() to allow OpenSSL to build a new
2322 * chain properly.
2323 */
2324 SSL_CTX_clear_extra_chain_certs(conn->ssl_ctx);
2325 #endif /* OPENSSL_VERSION_NUMBER < 0x10002000L */
2326 #endif /* PKCS12_FUNCS */
2327
2328 if (client_cert_blob &&
2329 SSL_use_certificate_ASN1(conn->ssl, (u8 *) client_cert_blob,
2330 client_cert_blob_len) == 1) {
2331 wpa_printf(MSG_DEBUG, "OpenSSL: SSL_use_certificate_ASN1 --> "
2332 "OK");
2333 return 0;
2334 } else if (client_cert_blob) {
2335 tls_show_errors(MSG_DEBUG, __func__,
2336 "SSL_use_certificate_ASN1 failed");
2337 }
2338
2339 if (client_cert == NULL)
2340 return -1;
2341
2342 #ifdef ANDROID
2343 if (os_strncmp("keystore://", client_cert, 11) == 0) {
2344 BIO *bio = BIO_from_keystore(&client_cert[11]);
2345 X509 *x509 = NULL;
2346 int ret = -1;
2347 if (bio) {
2348 x509 = PEM_read_bio_X509(bio, NULL, NULL, NULL);
2349 BIO_free(bio);
2350 }
2351 if (x509) {
2352 if (SSL_use_certificate(conn->ssl, x509) == 1)
2353 ret = 0;
2354 X509_free(x509);
2355 }
2356 return ret;
2357 }
2358 #endif /* ANDROID */
2359
2360 #ifndef OPENSSL_NO_STDIO
2361 if (SSL_use_certificate_file(conn->ssl, client_cert,
2362 SSL_FILETYPE_ASN1) == 1) {
2363 wpa_printf(MSG_DEBUG, "OpenSSL: SSL_use_certificate_file (DER)"
2364 " --> OK");
2365 return 0;
2366 }
2367
2368 if (SSL_use_certificate_file(conn->ssl, client_cert,
2369 SSL_FILETYPE_PEM) == 1) {
2370 ERR_clear_error();
2371 wpa_printf(MSG_DEBUG, "OpenSSL: SSL_use_certificate_file (PEM)"
2372 " --> OK");
2373 return 0;
2374 }
2375
2376 tls_show_errors(MSG_DEBUG, __func__,
2377 "SSL_use_certificate_file failed");
2378 #else /* OPENSSL_NO_STDIO */
2379 wpa_printf(MSG_DEBUG, "OpenSSL: %s - OPENSSL_NO_STDIO", __func__);
2380 #endif /* OPENSSL_NO_STDIO */
2381
2382 return -1;
2383 }
2384
2385
2386 static int tls_global_client_cert(struct tls_data *data,
2387 const char *client_cert)
2388 {
2389 #ifndef OPENSSL_NO_STDIO
2390 SSL_CTX *ssl_ctx = data->ssl;
2391
2392 if (client_cert == NULL)
2393 return 0;
2394
2395 if (SSL_CTX_use_certificate_file(ssl_ctx, client_cert,
2396 SSL_FILETYPE_ASN1) != 1 &&
2397 SSL_CTX_use_certificate_chain_file(ssl_ctx, client_cert) != 1 &&
2398 SSL_CTX_use_certificate_file(ssl_ctx, client_cert,
2399 SSL_FILETYPE_PEM) != 1) {
2400 tls_show_errors(MSG_INFO, __func__,
2401 "Failed to load client certificate");
2402 return -1;
2403 }
2404 return 0;
2405 #else /* OPENSSL_NO_STDIO */
2406 if (client_cert == NULL)
2407 return 0;
2408 wpa_printf(MSG_DEBUG, "OpenSSL: %s - OPENSSL_NO_STDIO", __func__);
2409 return -1;
2410 #endif /* OPENSSL_NO_STDIO */
2411 }
2412
2413
2414 static int tls_passwd_cb(char *buf, int size, int rwflag, void *password)
2415 {
2416 if (password == NULL) {
2417 return 0;
2418 }
2419 os_strlcpy(buf, (char *) password, size);
2420 return os_strlen(buf);
2421 }
2422
2423
2424 #ifdef PKCS12_FUNCS
2425 static int tls_parse_pkcs12(struct tls_data *data, SSL *ssl, PKCS12 *p12,
2426 const char *passwd)
2427 {
2428 EVP_PKEY *pkey;
2429 X509 *cert;
2430 STACK_OF(X509) *certs;
2431 int res = 0;
2432 char buf[256];
2433
2434 pkey = NULL;
2435 cert = NULL;
2436 certs = NULL;
2437 if (!passwd)
2438 passwd = "";
2439 if (!PKCS12_parse(p12, passwd, &pkey, &cert, &certs)) {
2440 tls_show_errors(MSG_DEBUG, __func__,
2441 "Failed to parse PKCS12 file");
2442 PKCS12_free(p12);
2443 return -1;
2444 }
2445 wpa_printf(MSG_DEBUG, "TLS: Successfully parsed PKCS12 data");
2446
2447 if (cert) {
2448 X509_NAME_oneline(X509_get_subject_name(cert), buf,
2449 sizeof(buf));
2450 wpa_printf(MSG_DEBUG, "TLS: Got certificate from PKCS12: "
2451 "subject='%s'", buf);
2452 if (ssl) {
2453 if (SSL_use_certificate(ssl, cert) != 1)
2454 res = -1;
2455 } else {
2456 if (SSL_CTX_use_certificate(data->ssl, cert) != 1)
2457 res = -1;
2458 }
2459 X509_free(cert);
2460 }
2461
2462 if (pkey) {
2463 wpa_printf(MSG_DEBUG, "TLS: Got private key from PKCS12");
2464 if (ssl) {
2465 if (SSL_use_PrivateKey(ssl, pkey) != 1)
2466 res = -1;
2467 } else {
2468 if (SSL_CTX_use_PrivateKey(data->ssl, pkey) != 1)
2469 res = -1;
2470 }
2471 EVP_PKEY_free(pkey);
2472 }
2473
2474 if (certs) {
2475 #if OPENSSL_VERSION_NUMBER >= 0x10002000L && !defined(LIBRESSL_VERSION_NUMBER)
2476 if (ssl)
2477 SSL_clear_chain_certs(ssl);
2478 else
2479 SSL_CTX_clear_chain_certs(data->ssl);
2480 while ((cert = sk_X509_pop(certs)) != NULL) {
2481 X509_NAME_oneline(X509_get_subject_name(cert), buf,
2482 sizeof(buf));
2483 wpa_printf(MSG_DEBUG, "TLS: additional certificate"
2484 " from PKCS12: subject='%s'", buf);
2485 if ((ssl && SSL_add1_chain_cert(ssl, cert) != 1) ||
2486 (!ssl && SSL_CTX_add1_chain_cert(data->ssl,
2487 cert) != 1)) {
2488 tls_show_errors(MSG_DEBUG, __func__,
2489 "Failed to add additional certificate");
2490 res = -1;
2491 break;
2492 }
2493 }
2494 if (!res) {
2495 /* Try to continue anyway */
2496 }
2497 sk_X509_free(certs);
2498 #ifndef OPENSSL_IS_BORINGSSL
2499 if (ssl)
2500 res = SSL_build_cert_chain(
2501 ssl,
2502 SSL_BUILD_CHAIN_FLAG_CHECK |
2503 SSL_BUILD_CHAIN_FLAG_IGNORE_ERROR);
2504 else
2505 res = SSL_CTX_build_cert_chain(
2506 data->ssl,
2507 SSL_BUILD_CHAIN_FLAG_CHECK |
2508 SSL_BUILD_CHAIN_FLAG_IGNORE_ERROR);
2509 if (!res) {
2510 tls_show_errors(MSG_DEBUG, __func__,
2511 "Failed to build certificate chain");
2512 } else if (res == 2) {
2513 wpa_printf(MSG_DEBUG,
2514 "TLS: Ignore certificate chain verification error when building chain with PKCS#12 extra certificates");
2515 }
2516 #endif /* OPENSSL_IS_BORINGSSL */
2517 /*
2518 * Try to continue regardless of result since it is possible for
2519 * the extra certificates not to be required.
2520 */
2521 res = 0;
2522 #else /* OPENSSL_VERSION_NUMBER >= 0x10002000L */
2523 SSL_CTX_clear_extra_chain_certs(data->ssl);
2524 while ((cert = sk_X509_pop(certs)) != NULL) {
2525 X509_NAME_oneline(X509_get_subject_name(cert), buf,
2526 sizeof(buf));
2527 wpa_printf(MSG_DEBUG, "TLS: additional certificate"
2528 " from PKCS12: subject='%s'", buf);
2529 /*
2530 * There is no SSL equivalent for the chain cert - so
2531 * always add it to the context...
2532 */
2533 if (SSL_CTX_add_extra_chain_cert(data->ssl, cert) != 1)
2534 {
2535 res = -1;
2536 break;
2537 }
2538 }
2539 sk_X509_free(certs);
2540 #endif /* OPENSSL_VERSION_NUMBER >= 0x10002000L */
2541 }
2542
2543 PKCS12_free(p12);
2544
2545 if (res < 0)
2546 tls_get_errors(data);
2547
2548 return res;
2549 }
2550 #endif /* PKCS12_FUNCS */
2551
2552
2553 static int tls_read_pkcs12(struct tls_data *data, SSL *ssl,
2554 const char *private_key, const char *passwd)
2555 {
2556 #ifdef PKCS12_FUNCS
2557 FILE *f;
2558 PKCS12 *p12;
2559
2560 f = fopen(private_key, "rb");
2561 if (f == NULL)
2562 return -1;
2563
2564 p12 = d2i_PKCS12_fp(f, NULL);
2565 fclose(f);
2566
2567 if (p12 == NULL) {
2568 tls_show_errors(MSG_INFO, __func__,
2569 "Failed to use PKCS#12 file");
2570 return -1;
2571 }
2572
2573 return tls_parse_pkcs12(data, ssl, p12, passwd);
2574
2575 #else /* PKCS12_FUNCS */
2576 wpa_printf(MSG_INFO, "TLS: PKCS12 support disabled - cannot read "
2577 "p12/pfx files");
2578 return -1;
2579 #endif /* PKCS12_FUNCS */
2580 }
2581
2582
2583 static int tls_read_pkcs12_blob(struct tls_data *data, SSL *ssl,
2584 const u8 *blob, size_t len, const char *passwd)
2585 {
2586 #ifdef PKCS12_FUNCS
2587 PKCS12 *p12;
2588
2589 p12 = d2i_PKCS12(NULL, (const unsigned char **) &blob, len);
2590 if (p12 == NULL) {
2591 tls_show_errors(MSG_INFO, __func__,
2592 "Failed to use PKCS#12 blob");
2593 return -1;
2594 }
2595
2596 return tls_parse_pkcs12(data, ssl, p12, passwd);
2597
2598 #else /* PKCS12_FUNCS */
2599 wpa_printf(MSG_INFO, "TLS: PKCS12 support disabled - cannot parse "
2600 "p12/pfx blobs");
2601 return -1;
2602 #endif /* PKCS12_FUNCS */
2603 }
2604
2605
2606 #ifndef OPENSSL_NO_ENGINE
2607 static int tls_engine_get_cert(struct tls_connection *conn,
2608 const char *cert_id,
2609 X509 **cert)
2610 {
2611 /* this runs after the private key is loaded so no PIN is required */
2612 struct {
2613 const char *cert_id;
2614 X509 *cert;
2615 } params;
2616 params.cert_id = cert_id;
2617 params.cert = NULL;
2618
2619 if (!ENGINE_ctrl_cmd(conn->engine, "LOAD_CERT_CTRL",
2620 0, &params, NULL, 1)) {
2621 unsigned long err = ERR_get_error();
2622
2623 wpa_printf(MSG_ERROR, "ENGINE: cannot load client cert with id"
2624 " '%s' [%s]", cert_id,
2625 ERR_error_string(err, NULL));
2626 if (tls_is_pin_error(err))
2627 return TLS_SET_PARAMS_ENGINE_PRV_BAD_PIN;
2628 return TLS_SET_PARAMS_ENGINE_PRV_INIT_FAILED;
2629 }
2630 if (!params.cert) {
2631 wpa_printf(MSG_ERROR, "ENGINE: did not properly cert with id"
2632 " '%s'", cert_id);
2633 return TLS_SET_PARAMS_ENGINE_PRV_INIT_FAILED;
2634 }
2635 *cert = params.cert;
2636 return 0;
2637 }
2638 #endif /* OPENSSL_NO_ENGINE */
2639
2640
2641 static int tls_connection_engine_client_cert(struct tls_connection *conn,
2642 const char *cert_id)
2643 {
2644 #ifndef OPENSSL_NO_ENGINE
2645 X509 *cert;
2646
2647 if (tls_engine_get_cert(conn, cert_id, &cert))
2648 return -1;
2649
2650 if (!SSL_use_certificate(conn->ssl, cert)) {
2651 tls_show_errors(MSG_ERROR, __func__,
2652 "SSL_use_certificate failed");
2653 X509_free(cert);
2654 return -1;
2655 }
2656 X509_free(cert);
2657 wpa_printf(MSG_DEBUG, "ENGINE: SSL_use_certificate --> "
2658 "OK");
2659 return 0;
2660
2661 #else /* OPENSSL_NO_ENGINE */
2662 return -1;
2663 #endif /* OPENSSL_NO_ENGINE */
2664 }
2665
2666
2667 static int tls_connection_engine_ca_cert(struct tls_data *data,
2668 struct tls_connection *conn,
2669 const char *ca_cert_id)
2670 {
2671 #ifndef OPENSSL_NO_ENGINE
2672 X509 *cert;
2673 SSL_CTX *ssl_ctx = data->ssl;
2674 X509_STORE *store;
2675
2676 if (tls_engine_get_cert(conn, ca_cert_id, &cert))
2677 return -1;
2678
2679 /* start off the same as tls_connection_ca_cert */
2680 store = X509_STORE_new();
2681 if (store == NULL) {
2682 wpa_printf(MSG_DEBUG, "OpenSSL: %s - failed to allocate new "
2683 "certificate store", __func__);
2684 X509_free(cert);
2685 return -1;
2686 }
2687 SSL_CTX_set_cert_store(ssl_ctx, store);
2688 if (!X509_STORE_add_cert(store, cert)) {
2689 unsigned long err = ERR_peek_error();
2690 tls_show_errors(MSG_WARNING, __func__,
2691 "Failed to add CA certificate from engine "
2692 "to certificate store");
2693 if (ERR_GET_LIB(err) == ERR_LIB_X509 &&
2694 ERR_GET_REASON(err) == X509_R_CERT_ALREADY_IN_HASH_TABLE) {
2695 wpa_printf(MSG_DEBUG, "OpenSSL: %s - ignoring cert"
2696 " already in hash table error",
2697 __func__);
2698 } else {
2699 X509_free(cert);
2700 return -1;
2701 }
2702 }
2703 X509_free(cert);
2704 wpa_printf(MSG_DEBUG, "OpenSSL: %s - added CA certificate from engine "
2705 "to certificate store", __func__);
2706 SSL_set_verify(conn->ssl, SSL_VERIFY_PEER, tls_verify_cb);
2707 conn->ca_cert_verify = 1;
2708
2709 return 0;
2710
2711 #else /* OPENSSL_NO_ENGINE */
2712 return -1;
2713 #endif /* OPENSSL_NO_ENGINE */
2714 }
2715
2716
2717 static int tls_connection_engine_private_key(struct tls_connection *conn)
2718 {
2719 #if defined(ANDROID) || !defined(OPENSSL_NO_ENGINE)
2720 if (SSL_use_PrivateKey(conn->ssl, conn->private_key) != 1) {
2721 tls_show_errors(MSG_ERROR, __func__,
2722 "ENGINE: cannot use private key for TLS");
2723 return -1;
2724 }
2725 if (!SSL_check_private_key(conn->ssl)) {
2726 tls_show_errors(MSG_INFO, __func__,
2727 "Private key failed verification");
2728 return -1;
2729 }
2730 return 0;
2731 #else /* OPENSSL_NO_ENGINE */
2732 wpa_printf(MSG_ERROR, "SSL: Configuration uses engine, but "
2733 "engine support was not compiled in");
2734 return -1;
2735 #endif /* OPENSSL_NO_ENGINE */
2736 }
2737
2738
2739 static int tls_connection_private_key(struct tls_data *data,
2740 struct tls_connection *conn,
2741 const char *private_key,
2742 const char *private_key_passwd,
2743 const u8 *private_key_blob,
2744 size_t private_key_blob_len)
2745 {
2746 SSL_CTX *ssl_ctx = data->ssl;
2747 char *passwd;
2748 int ok;
2749
2750 if (private_key == NULL && private_key_blob == NULL)
2751 return 0;
2752
2753 if (private_key_passwd) {
2754 passwd = os_strdup(private_key_passwd);
2755 if (passwd == NULL)
2756 return -1;
2757 } else
2758 passwd = NULL;
2759
2760 SSL_CTX_set_default_passwd_cb(ssl_ctx, tls_passwd_cb);
2761 SSL_CTX_set_default_passwd_cb_userdata(ssl_ctx, passwd);
2762
2763 ok = 0;
2764 while (private_key_blob) {
2765 if (SSL_use_PrivateKey_ASN1(EVP_PKEY_RSA, conn->ssl,
2766 (u8 *) private_key_blob,
2767 private_key_blob_len) == 1) {
2768 wpa_printf(MSG_DEBUG, "OpenSSL: SSL_use_PrivateKey_"
2769 "ASN1(EVP_PKEY_RSA) --> OK");
2770 ok = 1;
2771 break;
2772 }
2773
2774 if (SSL_use_PrivateKey_ASN1(EVP_PKEY_DSA, conn->ssl,
2775 (u8 *) private_key_blob,
2776 private_key_blob_len) == 1) {
2777 wpa_printf(MSG_DEBUG, "OpenSSL: SSL_use_PrivateKey_"
2778 "ASN1(EVP_PKEY_DSA) --> OK");
2779 ok = 1;
2780 break;
2781 }
2782
2783 if (SSL_use_RSAPrivateKey_ASN1(conn->ssl,
2784 (u8 *) private_key_blob,
2785 private_key_blob_len) == 1) {
2786 wpa_printf(MSG_DEBUG, "OpenSSL: "
2787 "SSL_use_RSAPrivateKey_ASN1 --> OK");
2788 ok = 1;
2789 break;
2790 }
2791
2792 if (tls_read_pkcs12_blob(data, conn->ssl, private_key_blob,
2793 private_key_blob_len, passwd) == 0) {
2794 wpa_printf(MSG_DEBUG, "OpenSSL: PKCS#12 as blob --> "
2795 "OK");
2796 ok = 1;
2797 break;
2798 }
2799
2800 break;
2801 }
2802
2803 while (!ok && private_key) {
2804 #ifndef OPENSSL_NO_STDIO
2805 if (SSL_use_PrivateKey_file(conn->ssl, private_key,
2806 SSL_FILETYPE_ASN1) == 1) {
2807 wpa_printf(MSG_DEBUG, "OpenSSL: "
2808 "SSL_use_PrivateKey_File (DER) --> OK");
2809 ok = 1;
2810 break;
2811 }
2812
2813 if (SSL_use_PrivateKey_file(conn->ssl, private_key,
2814 SSL_FILETYPE_PEM) == 1) {
2815 wpa_printf(MSG_DEBUG, "OpenSSL: "
2816 "SSL_use_PrivateKey_File (PEM) --> OK");
2817 ok = 1;
2818 break;
2819 }
2820 #else /* OPENSSL_NO_STDIO */
2821 wpa_printf(MSG_DEBUG, "OpenSSL: %s - OPENSSL_NO_STDIO",
2822 __func__);
2823 #endif /* OPENSSL_NO_STDIO */
2824
2825 if (tls_read_pkcs12(data, conn->ssl, private_key, passwd)
2826 == 0) {
2827 wpa_printf(MSG_DEBUG, "OpenSSL: Reading PKCS#12 file "
2828 "--> OK");
2829 ok = 1;
2830 break;
2831 }
2832
2833 if (tls_cryptoapi_cert(conn->ssl, private_key) == 0) {
2834 wpa_printf(MSG_DEBUG, "OpenSSL: Using CryptoAPI to "
2835 "access certificate store --> OK");
2836 ok = 1;
2837 break;
2838 }
2839
2840 break;
2841 }
2842
2843 if (!ok) {
2844 tls_show_errors(MSG_INFO, __func__,
2845 "Failed to load private key");
2846 os_free(passwd);
2847 return -1;
2848 }
2849 ERR_clear_error();
2850 SSL_CTX_set_default_passwd_cb(ssl_ctx, NULL);
2851 os_free(passwd);
2852
2853 if (!SSL_check_private_key(conn->ssl)) {
2854 tls_show_errors(MSG_INFO, __func__, "Private key failed "
2855 "verification");
2856 return -1;
2857 }
2858
2859 wpa_printf(MSG_DEBUG, "SSL: Private key loaded successfully");
2860 return 0;
2861 }
2862
2863
2864 static int tls_global_private_key(struct tls_data *data,
2865 const char *private_key,
2866 const char *private_key_passwd)
2867 {
2868 SSL_CTX *ssl_ctx = data->ssl;
2869 char *passwd;
2870
2871 if (private_key == NULL)
2872 return 0;
2873
2874 if (private_key_passwd) {
2875 passwd = os_strdup(private_key_passwd);
2876 if (passwd == NULL)
2877 return -1;
2878 } else
2879 passwd = NULL;
2880
2881 SSL_CTX_set_default_passwd_cb(ssl_ctx, tls_passwd_cb);
2882 SSL_CTX_set_default_passwd_cb_userdata(ssl_ctx, passwd);
2883 if (
2884 #ifndef OPENSSL_NO_STDIO
2885 SSL_CTX_use_PrivateKey_file(ssl_ctx, private_key,
2886 SSL_FILETYPE_ASN1) != 1 &&
2887 SSL_CTX_use_PrivateKey_file(ssl_ctx, private_key,
2888 SSL_FILETYPE_PEM) != 1 &&
2889 #endif /* OPENSSL_NO_STDIO */
2890 tls_read_pkcs12(data, NULL, private_key, passwd)) {
2891 tls_show_errors(MSG_INFO, __func__,
2892 "Failed to load private key");
2893 os_free(passwd);
2894 ERR_clear_error();
2895 return -1;
2896 }
2897 os_free(passwd);
2898 ERR_clear_error();
2899 SSL_CTX_set_default_passwd_cb(ssl_ctx, NULL);
2900
2901 if (!SSL_CTX_check_private_key(ssl_ctx)) {
2902 tls_show_errors(MSG_INFO, __func__,
2903 "Private key failed verification");
2904 return -1;
2905 }
2906
2907 return 0;
2908 }
2909
2910
2911 static int tls_connection_dh(struct tls_connection *conn, const char *dh_file)
2912 {
2913 #ifdef OPENSSL_NO_DH
2914 if (dh_file == NULL)
2915 return 0;
2916 wpa_printf(MSG_ERROR, "TLS: openssl does not include DH support, but "
2917 "dh_file specified");
2918 return -1;
2919 #else /* OPENSSL_NO_DH */
2920 DH *dh;
2921 BIO *bio;
2922
2923 /* TODO: add support for dh_blob */
2924 if (dh_file == NULL)
2925 return 0;
2926 if (conn == NULL)
2927 return -1;
2928
2929 bio = BIO_new_file(dh_file, "r");
2930 if (bio == NULL) {
2931 wpa_printf(MSG_INFO, "TLS: Failed to open DH file '%s': %s",
2932 dh_file, ERR_error_string(ERR_get_error(), NULL));
2933 return -1;
2934 }
2935 dh = PEM_read_bio_DHparams(bio, NULL, NULL, NULL);
2936 BIO_free(bio);
2937 #ifndef OPENSSL_NO_DSA
2938 while (dh == NULL) {
2939 DSA *dsa;
2940 wpa_printf(MSG_DEBUG, "TLS: Failed to parse DH file '%s': %s -"
2941 " trying to parse as DSA params", dh_file,
2942 ERR_error_string(ERR_get_error(), NULL));
2943 bio = BIO_new_file(dh_file, "r");
2944 if (bio == NULL)
2945 break;
2946 dsa = PEM_read_bio_DSAparams(bio, NULL, NULL, NULL);
2947 BIO_free(bio);
2948 if (!dsa) {
2949 wpa_printf(MSG_DEBUG, "TLS: Failed to parse DSA file "
2950 "'%s': %s", dh_file,
2951 ERR_error_string(ERR_get_error(), NULL));
2952 break;
2953 }
2954
2955 wpa_printf(MSG_DEBUG, "TLS: DH file in DSA param format");
2956 dh = DSA_dup_DH(dsa);
2957 DSA_free(dsa);
2958 if (dh == NULL) {
2959 wpa_printf(MSG_INFO, "TLS: Failed to convert DSA "
2960 "params into DH params");
2961 break;
2962 }
2963 break;
2964 }
2965 #endif /* !OPENSSL_NO_DSA */
2966 if (dh == NULL) {
2967 wpa_printf(MSG_INFO, "TLS: Failed to read/parse DH/DSA file "
2968 "'%s'", dh_file);
2969 return -1;
2970 }
2971
2972 if (SSL_set_tmp_dh(conn->ssl, dh) != 1) {
2973 wpa_printf(MSG_INFO, "TLS: Failed to set DH params from '%s': "
2974 "%s", dh_file,
2975 ERR_error_string(ERR_get_error(), NULL));
2976 DH_free(dh);
2977 return -1;
2978 }
2979 DH_free(dh);
2980 return 0;
2981 #endif /* OPENSSL_NO_DH */
2982 }
2983
2984
2985 static int tls_global_dh(struct tls_data *data, const char *dh_file)
2986 {
2987 #ifdef OPENSSL_NO_DH
2988 if (dh_file == NULL)
2989 return 0;
2990 wpa_printf(MSG_ERROR, "TLS: openssl does not include DH support, but "
2991 "dh_file specified");
2992 return -1;
2993 #else /* OPENSSL_NO_DH */
2994 SSL_CTX *ssl_ctx = data->ssl;
2995 DH *dh;
2996 BIO *bio;
2997
2998 /* TODO: add support for dh_blob */
2999 if (dh_file == NULL)
3000 return 0;
3001 if (ssl_ctx == NULL)
3002 return -1;
3003
3004 bio = BIO_new_file(dh_file, "r");
3005 if (bio == NULL) {
3006 wpa_printf(MSG_INFO, "TLS: Failed to open DH file '%s': %s",
3007 dh_file, ERR_error_string(ERR_get_error(), NULL));
3008 return -1;
3009 }
3010 dh = PEM_read_bio_DHparams(bio, NULL, NULL, NULL);
3011 BIO_free(bio);
3012 #ifndef OPENSSL_NO_DSA
3013 while (dh == NULL) {
3014 DSA *dsa;
3015 wpa_printf(MSG_DEBUG, "TLS: Failed to parse DH file '%s': %s -"
3016 " trying to parse as DSA params", dh_file,
3017 ERR_error_string(ERR_get_error(), NULL));
3018 bio = BIO_new_file(dh_file, "r");
3019 if (bio == NULL)
3020 break;
3021 dsa = PEM_read_bio_DSAparams(bio, NULL, NULL, NULL);
3022 BIO_free(bio);
3023 if (!dsa) {
3024 wpa_printf(MSG_DEBUG, "TLS: Failed to parse DSA file "
3025 "'%s': %s", dh_file,
3026 ERR_error_string(ERR_get_error(), NULL));
3027 break;
3028 }
3029
3030 wpa_printf(MSG_DEBUG, "TLS: DH file in DSA param format");
3031 dh = DSA_dup_DH(dsa);
3032 DSA_free(dsa);
3033 if (dh == NULL) {
3034 wpa_printf(MSG_INFO, "TLS: Failed to convert DSA "
3035 "params into DH params");
3036 break;
3037 }
3038 break;
3039 }
3040 #endif /* !OPENSSL_NO_DSA */
3041 if (dh == NULL) {
3042 wpa_printf(MSG_INFO, "TLS: Failed to read/parse DH/DSA file "
3043 "'%s'", dh_file);
3044 return -1;
3045 }
3046
3047 if (SSL_CTX_set_tmp_dh(ssl_ctx, dh) != 1) {
3048 wpa_printf(MSG_INFO, "TLS: Failed to set DH params from '%s': "
3049 "%s", dh_file,
3050 ERR_error_string(ERR_get_error(), NULL));
3051 DH_free(dh);
3052 return -1;
3053 }
3054 DH_free(dh);
3055 return 0;
3056 #endif /* OPENSSL_NO_DH */
3057 }
3058
3059
3060 int tls_connection_get_random(void *ssl_ctx, struct tls_connection *conn,
3061 struct tls_random *keys)
3062 {
3063 SSL *ssl;
3064
3065 if (conn == NULL || keys == NULL)
3066 return -1;
3067 ssl = conn->ssl;
3068 if (ssl == NULL)
3069 return -1;
3070
3071 os_memset(keys, 0, sizeof(*keys));
3072 keys->client_random = conn->client_random;
3073 keys->client_random_len = SSL_get_client_random(
3074 ssl, conn->client_random, sizeof(conn->client_random));
3075 keys->server_random = conn->server_random;
3076 keys->server_random_len = SSL_get_server_random(
3077 ssl, conn->server_random, sizeof(conn->server_random));
3078
3079 return 0;
3080 }
3081
3082
3083 #ifndef CONFIG_FIPS
3084 static int openssl_get_keyblock_size(SSL *ssl)
3085 {
3086 #if OPENSSL_VERSION_NUMBER < 0x10100000L || defined(LIBRESSL_VERSION_NUMBER)
3087 const EVP_CIPHER *c;
3088 const EVP_MD *h;
3089 int md_size;
3090
3091 if (ssl->enc_read_ctx == NULL || ssl->enc_read_ctx->cipher == NULL ||
3092 ssl->read_hash == NULL)
3093 return -1;
3094
3095 c = ssl->enc_read_ctx->cipher;
3096 h = EVP_MD_CTX_md(ssl->read_hash);
3097 if (h)
3098 md_size = EVP_MD_size(h);
3099 else if (ssl->s3)
3100 md_size = ssl->s3->tmp.new_mac_secret_size;
3101 else
3102 return -1;
3103
3104 wpa_printf(MSG_DEBUG, "OpenSSL: keyblock size: key_len=%d MD_size=%d "
3105 "IV_len=%d", EVP_CIPHER_key_length(c), md_size,
3106 EVP_CIPHER_iv_length(c));
3107 return 2 * (EVP_CIPHER_key_length(c) +
3108 md_size +
3109 EVP_CIPHER_iv_length(c));
3110 #else
3111 const SSL_CIPHER *ssl_cipher;
3112 int cipher, digest;
3113 const EVP_CIPHER *c;
3114 const EVP_MD *h;
3115
3116 ssl_cipher = SSL_get_current_cipher(ssl);
3117 if (!ssl_cipher)
3118 return -1;
3119 cipher = SSL_CIPHER_get_cipher_nid(ssl_cipher);
3120 digest = SSL_CIPHER_get_digest_nid(ssl_cipher);
3121 wpa_printf(MSG_DEBUG, "OpenSSL: cipher nid %d digest nid %d",
3122 cipher, digest);
3123 if (cipher < 0 || digest < 0)
3124 return -1;
3125 c = EVP_get_cipherbynid(cipher);
3126 h = EVP_get_digestbynid(digest);
3127 if (!c || !h)
3128 return -1;
3129
3130 wpa_printf(MSG_DEBUG,
3131 "OpenSSL: keyblock size: key_len=%d MD_size=%d IV_len=%d",
3132 EVP_CIPHER_key_length(c), EVP_MD_size(h),
3133 EVP_CIPHER_iv_length(c));
3134 return 2 * (EVP_CIPHER_key_length(c) + EVP_MD_size(h) +
3135 EVP_CIPHER_iv_length(c));
3136 #endif
3137 }
3138 #endif /* CONFIG_FIPS */
3139
3140
3141 static int openssl_tls_prf(struct tls_connection *conn,
3142 const char *label, int server_random_first,
3143 int skip_keyblock, u8 *out, size_t out_len)
3144 {
3145 #ifdef CONFIG_FIPS
3146 wpa_printf(MSG_ERROR, "OpenSSL: TLS keys cannot be exported in FIPS "
3147 "mode");
3148 return -1;
3149 #else /* CONFIG_FIPS */
3150 SSL *ssl;
3151 SSL_SESSION *sess;
3152 u8 *rnd;
3153 int ret = -1;
3154 int skip = 0;
3155 u8 *tmp_out = NULL;
3156 u8 *_out = out;
3157 unsigned char client_random[SSL3_RANDOM_SIZE];
3158 unsigned char server_random[SSL3_RANDOM_SIZE];
3159 unsigned char master_key[64];
3160 size_t master_key_len;
3161 const char *ver;
3162
3163 /*
3164 * TLS library did not support key generation, so get the needed TLS
3165 * session parameters and use an internal implementation of TLS PRF to
3166 * derive the key.
3167 */
3168
3169 if (conn == NULL)
3170 return -1;
3171 ssl = conn->ssl;
3172 if (ssl == NULL)
3173 return -1;
3174 ver = SSL_get_version(ssl);
3175 sess = SSL_get_session(ssl);
3176 if (!ver || !sess)
3177 return -1;
3178
3179 if (skip_keyblock) {
3180 skip = openssl_get_keyblock_size(ssl);
3181 if (skip < 0)
3182 return -1;
3183 tmp_out = os_malloc(skip + out_len);
3184 if (!tmp_out)
3185 return -1;
3186 _out = tmp_out;
3187 }
3188
3189 rnd = os_malloc(2 * SSL3_RANDOM_SIZE);
3190 if (!rnd) {
3191 os_free(tmp_out);
3192 return -1;
3193 }
3194
3195 SSL_get_client_random(ssl, client_random, sizeof(client_random));
3196 SSL_get_server_random(ssl, server_random, sizeof(server_random));
3197 master_key_len = SSL_SESSION_get_master_key(sess, master_key,
3198 sizeof(master_key));
3199
3200 if (server_random_first) {
3201 os_memcpy(rnd, server_random, SSL3_RANDOM_SIZE);
3202 os_memcpy(rnd + SSL3_RANDOM_SIZE, client_random,
3203 SSL3_RANDOM_SIZE);
3204 } else {
3205 os_memcpy(rnd, client_random, SSL3_RANDOM_SIZE);
3206 os_memcpy(rnd + SSL3_RANDOM_SIZE, server_random,
3207 SSL3_RANDOM_SIZE);
3208 }
3209
3210 if (os_strcmp(ver, "TLSv1.2") == 0) {
3211 tls_prf_sha256(master_key, master_key_len,
3212 label, rnd, 2 * SSL3_RANDOM_SIZE,
3213 _out, skip + out_len);
3214 ret = 0;
3215 } else if (tls_prf_sha1_md5(master_key, master_key_len,
3216 label, rnd, 2 * SSL3_RANDOM_SIZE,
3217 _out, skip + out_len) == 0) {
3218 ret = 0;
3219 }
3220 os_memset(master_key, 0, sizeof(master_key));
3221 os_free(rnd);
3222 if (ret == 0 && skip_keyblock)
3223 os_memcpy(out, _out + skip, out_len);
3224 bin_clear_free(tmp_out, skip);
3225
3226 return ret;
3227 #endif /* CONFIG_FIPS */
3228 }
3229
3230
3231 int tls_connection_prf(void *tls_ctx, struct tls_connection *conn,
3232 const char *label, int server_random_first,
3233 int skip_keyblock, u8 *out, size_t out_len)
3234 {
3235 if (conn == NULL)
3236 return -1;
3237 if (server_random_first || skip_keyblock)
3238 return openssl_tls_prf(conn, label,
3239 server_random_first, skip_keyblock,
3240 out, out_len);
3241 if (SSL_export_keying_material(conn->ssl, out, out_len, label,
3242 os_strlen(label), NULL, 0, 0) == 1) {
3243 wpa_printf(MSG_DEBUG, "OpenSSL: Using internal PRF");
3244 return 0;
3245 }
3246 return openssl_tls_prf(conn, label, server_random_first,
3247 skip_keyblock, out, out_len);
3248 }
3249
3250
3251 static struct wpabuf *
3252 openssl_handshake(struct tls_connection *conn, const struct wpabuf *in_data,
3253 int server)
3254 {
3255 int res;
3256 struct wpabuf *out_data;
3257
3258 /*
3259 * Give TLS handshake data from the server (if available) to OpenSSL
3260 * for processing.
3261 */
3262 if (in_data && wpabuf_len(in_data) > 0 &&
3263 BIO_write(conn->ssl_in, wpabuf_head(in_data), wpabuf_len(in_data))
3264 < 0) {
3265 tls_show_errors(MSG_INFO, __func__,
3266 "Handshake failed - BIO_write");
3267 return NULL;
3268 }
3269
3270 /* Initiate TLS handshake or continue the existing handshake */
3271 if (server)
3272 res = SSL_accept(conn->ssl);
3273 else
3274 res = SSL_connect(conn->ssl);
3275 if (res != 1) {
3276 int err = SSL_get_error(conn->ssl, res);
3277 if (err == SSL_ERROR_WANT_READ)
3278 wpa_printf(MSG_DEBUG, "SSL: SSL_connect - want "
3279 "more data");
3280 else if (err == SSL_ERROR_WANT_WRITE)
3281 wpa_printf(MSG_DEBUG, "SSL: SSL_connect - want to "
3282 "write");
3283 else {
3284 tls_show_errors(MSG_INFO, __func__, "SSL_connect");
3285 conn->failed++;
3286 }
3287 }
3288
3289 /* Get the TLS handshake data to be sent to the server */
3290 res = BIO_ctrl_pending(conn->ssl_out);
3291 wpa_printf(MSG_DEBUG, "SSL: %d bytes pending from ssl_out", res);
3292 out_data = wpabuf_alloc(res);
3293 if (out_data == NULL) {
3294 wpa_printf(MSG_DEBUG, "SSL: Failed to allocate memory for "
3295 "handshake output (%d bytes)", res);
3296 if (BIO_reset(conn->ssl_out) < 0) {
3297 tls_show_errors(MSG_INFO, __func__,
3298 "BIO_reset failed");
3299 }
3300 return NULL;
3301 }
3302 res = res == 0 ? 0 : BIO_read(conn->ssl_out, wpabuf_mhead(out_data),
3303 res);
3304 if (res < 0) {
3305 tls_show_errors(MSG_INFO, __func__,
3306 "Handshake failed - BIO_read");
3307 if (BIO_reset(conn->ssl_out) < 0) {
3308 tls_show_errors(MSG_INFO, __func__,
3309 "BIO_reset failed");
3310 }
3311 wpabuf_free(out_data);
3312 return NULL;
3313 }
3314 wpabuf_put(out_data, res);
3315
3316 return out_data;
3317 }
3318
3319
3320 static struct wpabuf *
3321 openssl_get_appl_data(struct tls_connection *conn, size_t max_len)
3322 {
3323 struct wpabuf *appl_data;
3324 int res;
3325
3326 appl_data = wpabuf_alloc(max_len + 100);
3327 if (appl_data == NULL)
3328 return NULL;
3329
3330 res = SSL_read(conn->ssl, wpabuf_mhead(appl_data),
3331 wpabuf_size(appl_data));
3332 if (res < 0) {
3333 int err = SSL_get_error(conn->ssl, res);
3334 if (err == SSL_ERROR_WANT_READ ||
3335 err == SSL_ERROR_WANT_WRITE) {
3336 wpa_printf(MSG_DEBUG, "SSL: No Application Data "
3337 "included");
3338 } else {
3339 tls_show_errors(MSG_INFO, __func__,
3340 "Failed to read possible "
3341 "Application Data");
3342 }
3343 wpabuf_free(appl_data);
3344 return NULL;
3345 }
3346
3347 wpabuf_put(appl_data, res);
3348 wpa_hexdump_buf_key(MSG_MSGDUMP, "SSL: Application Data in Finished "
3349 "message", appl_data);
3350
3351 return appl_data;
3352 }
3353
3354
3355 static struct wpabuf *
3356 openssl_connection_handshake(struct tls_connection *conn,
3357 const struct wpabuf *in_data,
3358 struct wpabuf **appl_data, int server)
3359 {
3360 struct wpabuf *out_data;
3361
3362 if (appl_data)
3363 *appl_data = NULL;
3364
3365 out_data = openssl_handshake(conn, in_data, server);
3366 if (out_data == NULL)
3367 return NULL;
3368 if (conn->invalid_hb_used) {
3369 wpa_printf(MSG_INFO, "TLS: Heartbeat attack detected - do not send response");
3370 wpabuf_free(out_data);
3371 return NULL;
3372 }
3373
3374 if (SSL_is_init_finished(conn->ssl)) {
3375 wpa_printf(MSG_DEBUG,
3376 "OpenSSL: Handshake finished - resumed=%d",
3377 tls_connection_resumed(conn->ssl_ctx, conn));
3378 if (appl_data && in_data)
3379 *appl_data = openssl_get_appl_data(conn,
3380 wpabuf_len(in_data));
3381 }
3382
3383 if (conn->invalid_hb_used) {
3384 wpa_printf(MSG_INFO, "TLS: Heartbeat attack detected - do not send response");
3385 if (appl_data) {
3386 wpabuf_free(*appl_data);
3387 *appl_data = NULL;
3388 }
3389 wpabuf_free(out_data);
3390 return NULL;
3391 }
3392
3393 return out_data;
3394 }
3395
3396
3397 struct wpabuf *
3398 tls_connection_handshake(void *ssl_ctx, struct tls_connection *conn,
3399 const struct wpabuf *in_data,
3400 struct wpabuf **appl_data)
3401 {
3402 return openssl_connection_handshake(conn, in_data, appl_data, 0);
3403 }
3404
3405
3406 struct wpabuf * tls_connection_server_handshake(void *tls_ctx,
3407 struct tls_connection *conn,
3408 const struct wpabuf *in_data,
3409 struct wpabuf **appl_data)
3410 {
3411 return openssl_connection_handshake(conn, in_data, appl_data, 1);
3412 }
3413
3414
3415 struct wpabuf * tls_connection_encrypt(void *tls_ctx,
3416 struct tls_connection *conn,
3417 const struct wpabuf *in_data)
3418 {
3419 int res;
3420 struct wpabuf *buf;
3421
3422 if (conn == NULL)
3423 return NULL;
3424
3425 /* Give plaintext data for OpenSSL to encrypt into the TLS tunnel. */
3426 if ((res = BIO_reset(conn->ssl_in)) < 0 ||
3427 (res = BIO_reset(conn->ssl_out)) < 0) {
3428 tls_show_errors(MSG_INFO, __func__, "BIO_reset failed");
3429 return NULL;
3430 }
3431 res = SSL_write(conn->ssl, wpabuf_head(in_data), wpabuf_len(in_data));
3432 if (res < 0) {
3433 tls_show_errors(MSG_INFO, __func__,
3434 "Encryption failed - SSL_write");
3435 return NULL;
3436 }
3437
3438 /* Read encrypted data to be sent to the server */
3439 buf = wpabuf_alloc(wpabuf_len(in_data) + 300);
3440 if (buf == NULL)
3441 return NULL;
3442 res = BIO_read(conn->ssl_out, wpabuf_mhead(buf), wpabuf_size(buf));
3443 if (res < 0) {
3444 tls_show_errors(MSG_INFO, __func__,
3445 "Encryption failed - BIO_read");
3446 wpabuf_free(buf);
3447 return NULL;
3448 }
3449 wpabuf_put(buf, res);
3450
3451 return buf;
3452 }
3453
3454
3455 struct wpabuf * tls_connection_decrypt(void *tls_ctx,
3456 struct tls_connection *conn,
3457 const struct wpabuf *in_data)
3458 {
3459 int res;
3460 struct wpabuf *buf;
3461
3462 /* Give encrypted data from TLS tunnel for OpenSSL to decrypt. */
3463 res = BIO_write(conn->ssl_in, wpabuf_head(in_data),
3464 wpabuf_len(in_data));
3465 if (res < 0) {
3466 tls_show_errors(MSG_INFO, __func__,
3467 "Decryption failed - BIO_write");
3468 return NULL;
3469 }
3470 if (BIO_reset(conn->ssl_out) < 0) {
3471 tls_show_errors(MSG_INFO, __func__, "BIO_reset failed");
3472 return NULL;
3473 }
3474
3475 /* Read decrypted data for further processing */
3476 /*
3477 * Even though we try to disable TLS compression, it is possible that
3478 * this cannot be done with all TLS libraries. Add extra buffer space
3479 * to handle the possibility of the decrypted data being longer than
3480 * input data.
3481 */
3482 buf = wpabuf_alloc((wpabuf_len(in_data) + 500) * 3);
3483 if (buf == NULL)
3484 return NULL;
3485 res = SSL_read(conn->ssl, wpabuf_mhead(buf), wpabuf_size(buf));
3486 if (res < 0) {
3487 tls_show_errors(MSG_INFO, __func__,
3488 "Decryption failed - SSL_read");
3489 wpabuf_free(buf);
3490 return NULL;
3491 }
3492 wpabuf_put(buf, res);
3493
3494 if (conn->invalid_hb_used) {
3495 wpa_printf(MSG_INFO, "TLS: Heartbeat attack detected - do not send response");
3496 wpabuf_free(buf);
3497 return NULL;
3498 }
3499
3500 return buf;
3501 }
3502
3503
3504 int tls_connection_resumed(void *ssl_ctx, struct tls_connection *conn)
3505 {
3506 return conn ? SSL_cache_hit(conn->ssl) : 0;
3507 }
3508
3509
3510 int tls_connection_set_cipher_list(void *tls_ctx, struct tls_connection *conn,
3511 u8 *ciphers)
3512 {
3513 char buf[500], *pos, *end;
3514 u8 *c;
3515 int ret;
3516
3517 if (conn == NULL || conn->ssl == NULL || ciphers == NULL)
3518 return -1;
3519
3520 buf[0] = '\0';
3521 pos = buf;
3522 end = pos + sizeof(buf);
3523
3524 c = ciphers;
3525 while (*c != TLS_CIPHER_NONE) {
3526 const char *suite;
3527
3528 switch (*c) {
3529 case TLS_CIPHER_RC4_SHA:
3530 suite = "RC4-SHA";
3531 break;
3532 case TLS_CIPHER_AES128_SHA:
3533 suite = "AES128-SHA";
3534 break;
3535 case TLS_CIPHER_RSA_DHE_AES128_SHA:
3536 suite = "DHE-RSA-AES128-SHA";
3537 break;
3538 case TLS_CIPHER_ANON_DH_AES128_SHA:
3539 suite = "ADH-AES128-SHA";
3540 break;
3541 case TLS_CIPHER_RSA_DHE_AES256_SHA:
3542 suite = "DHE-RSA-AES256-SHA";
3543 break;
3544 case TLS_CIPHER_AES256_SHA:
3545 suite = "AES256-SHA";
3546 break;
3547 default:
3548 wpa_printf(MSG_DEBUG, "TLS: Unsupported "
3549 "cipher selection: %d", *c);
3550 return -1;
3551 }
3552 ret = os_snprintf(pos, end - pos, ":%s", suite);
3553 if (os_snprintf_error(end - pos, ret))
3554 break;
3555 pos += ret;
3556
3557 c++;
3558 }
3559
3560 wpa_printf(MSG_DEBUG, "OpenSSL: cipher suites: %s", buf + 1);
3561
3562 #if OPENSSL_VERSION_NUMBER >= 0x10100000L && !defined(LIBRESSL_VERSION_NUMBER)
3563 #if defined(EAP_FAST) || defined(EAP_FAST_DYNAMIC) || defined(EAP_SERVER_FAST)
3564 if (os_strstr(buf, ":ADH-")) {
3565 /*
3566 * Need to drop to security level 0 to allow anonymous
3567 * cipher suites for EAP-FAST.
3568 */
3569 SSL_set_security_level(conn->ssl, 0);
3570 } else if (SSL_get_security_level(conn->ssl) == 0) {
3571 /* Force at least security level 1 */
3572 SSL_set_security_level(conn->ssl, 1);
3573 }
3574 #endif /* EAP_FAST || EAP_FAST_DYNAMIC || EAP_SERVER_FAST */
3575 #endif
3576
3577 if (SSL_set_cipher_list(conn->ssl, buf + 1) != 1) {
3578 tls_show_errors(MSG_INFO, __func__,
3579 "Cipher suite configuration failed");
3580 return -1;
3581 }
3582
3583 return 0;
3584 }
3585
3586
3587 int tls_get_version(void *ssl_ctx, struct tls_connection *conn,
3588 char *buf, size_t buflen)
3589 {
3590 const char *name;
3591 if (conn == NULL || conn->ssl == NULL)
3592 return -1;
3593
3594 name = SSL_get_version(conn->ssl);
3595 if (name == NULL)
3596 return -1;
3597
3598 os_strlcpy(buf, name, buflen);
3599 return 0;
3600 }
3601
3602
3603 int tls_get_cipher(void *ssl_ctx, struct tls_connection *conn,
3604 char *buf, size_t buflen)
3605 {
3606 const char *name;
3607 if (conn == NULL || conn->ssl == NULL)
3608 return -1;
3609
3610 name = SSL_get_cipher(conn->ssl);
3611 if (name == NULL)
3612 return -1;
3613
3614 os_strlcpy(buf, name, buflen);
3615 return 0;
3616 }
3617
3618
3619 int tls_connection_enable_workaround(void *ssl_ctx,
3620 struct tls_connection *conn)
3621 {
3622 SSL_set_options(conn->ssl, SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS);
3623
3624 return 0;
3625 }
3626
3627
3628 #if defined(EAP_FAST) || defined(EAP_FAST_DYNAMIC) || defined(EAP_SERVER_FAST)
3629 /* ClientHello TLS extensions require a patch to openssl, so this function is
3630 * commented out unless explicitly needed for EAP-FAST in order to be able to
3631 * build this file with unmodified openssl. */
3632 int tls_connection_client_hello_ext(void *ssl_ctx, struct tls_connection *conn,
3633 int ext_type, const u8 *data,
3634 size_t data_len)
3635 {
3636 if (conn == NULL || conn->ssl == NULL || ext_type != 35)
3637 return -1;
3638
3639 if (SSL_set_session_ticket_ext(conn->ssl, (void *) data,
3640 data_len) != 1)
3641 return -1;
3642
3643 return 0;
3644 }
3645 #endif /* EAP_FAST || EAP_FAST_DYNAMIC || EAP_SERVER_FAST */
3646
3647
3648 int tls_connection_get_failed(void *ssl_ctx, struct tls_connection *conn)
3649 {
3650 if (conn == NULL)
3651 return -1;
3652 return conn->failed;
3653 }
3654
3655
3656 int tls_connection_get_read_alerts(void *ssl_ctx, struct tls_connection *conn)
3657 {
3658 if (conn == NULL)
3659 return -1;
3660 return conn->read_alerts;
3661 }
3662
3663
3664 int tls_connection_get_write_alerts(void *ssl_ctx, struct tls_connection *conn)
3665 {
3666 if (conn == NULL)
3667 return -1;
3668 return conn->write_alerts;
3669 }
3670
3671
3672 #ifdef HAVE_OCSP
3673
3674 static void ocsp_debug_print_resp(OCSP_RESPONSE *rsp)
3675 {
3676 #ifndef CONFIG_NO_STDOUT_DEBUG
3677 BIO *out;
3678 size_t rlen;
3679 char *txt;
3680 int res;
3681
3682 if (wpa_debug_level > MSG_DEBUG)
3683 return;
3684
3685 out = BIO_new(BIO_s_mem());
3686 if (!out)
3687 return;
3688
3689 OCSP_RESPONSE_print(out, rsp, 0);
3690 rlen = BIO_ctrl_pending(out);
3691 txt = os_malloc(rlen + 1);
3692 if (!txt) {
3693 BIO_free(out);
3694 return;
3695 }
3696
3697 res = BIO_read(out, txt, rlen);
3698 if (res > 0) {
3699 txt[res] = '\0';
3700 wpa_printf(MSG_DEBUG, "OpenSSL: OCSP Response\n%s", txt);
3701 }
3702 os_free(txt);
3703 BIO_free(out);
3704 #endif /* CONFIG_NO_STDOUT_DEBUG */
3705 }
3706
3707
3708 static void debug_print_cert(X509 *cert, const char *title)
3709 {
3710 #ifndef CONFIG_NO_STDOUT_DEBUG
3711 BIO *out;
3712 size_t rlen;
3713 char *txt;
3714 int res;
3715
3716 if (wpa_debug_level > MSG_DEBUG)
3717 return;
3718
3719 out = BIO_new(BIO_s_mem());
3720 if (!out)
3721 return;
3722
3723 X509_print(out, cert);
3724 rlen = BIO_ctrl_pending(out);
3725 txt = os_malloc(rlen + 1);
3726 if (!txt) {
3727 BIO_free(out);
3728 return;
3729 }
3730
3731 res = BIO_read(out, txt, rlen);
3732 if (res > 0) {
3733 txt[res] = '\0';
3734 wpa_printf(MSG_DEBUG, "OpenSSL: %s\n%s", title, txt);
3735 }
3736 os_free(txt);
3737
3738 BIO_free(out);
3739 #endif /* CONFIG_NO_STDOUT_DEBUG */
3740 }
3741
3742
3743 static int ocsp_resp_cb(SSL *s, void *arg)
3744 {
3745 struct tls_connection *conn = arg;
3746 const unsigned char *p;
3747 int len, status, reason;
3748 OCSP_RESPONSE *rsp;
3749 OCSP_BASICRESP *basic;
3750 OCSP_CERTID *id;
3751 ASN1_GENERALIZEDTIME *produced_at, *this_update, *next_update;
3752 X509_STORE *store;
3753 STACK_OF(X509) *certs = NULL;
3754
3755 len = SSL_get_tlsext_status_ocsp_resp(s, &p);
3756 if (!p) {
3757 wpa_printf(MSG_DEBUG, "OpenSSL: No OCSP response received");
3758 return (conn->flags & TLS_CONN_REQUIRE_OCSP) ? 0 : 1;
3759 }
3760
3761 wpa_hexdump(MSG_DEBUG, "OpenSSL: OCSP response", p, len);
3762
3763 rsp = d2i_OCSP_RESPONSE(NULL, &p, len);
3764 if (!rsp) {
3765 wpa_printf(MSG_INFO, "OpenSSL: Failed to parse OCSP response");
3766 return 0;
3767 }
3768
3769 ocsp_debug_print_resp(rsp);
3770
3771 status = OCSP_response_status(rsp);
3772 if (status != OCSP_RESPONSE_STATUS_SUCCESSFUL) {
3773 wpa_printf(MSG_INFO, "OpenSSL: OCSP responder error %d (%s)",
3774 status, OCSP_response_status_str(status));
3775 return 0;
3776 }
3777
3778 basic = OCSP_response_get1_basic(rsp);
3779 if (!basic) {
3780 wpa_printf(MSG_INFO, "OpenSSL: Could not find BasicOCSPResponse");
3781 return 0;
3782 }
3783
3784 store = SSL_CTX_get_cert_store(conn->ssl_ctx);
3785 if (conn->peer_issuer) {
3786 debug_print_cert(conn->peer_issuer, "Add OCSP issuer");
3787
3788 if (X509_STORE_add_cert(store, conn->peer_issuer) != 1) {
3789 tls_show_errors(MSG_INFO, __func__,
3790 "OpenSSL: Could not add issuer to certificate store");
3791 }
3792 certs = sk_X509_new_null();
3793 if (certs) {
3794 X509 *cert;
3795 cert = X509_dup(conn->peer_issuer);
3796 if (cert && !sk_X509_push(certs, cert)) {
3797 tls_show_errors(
3798 MSG_INFO, __func__,
3799 "OpenSSL: Could not add issuer to OCSP responder trust store");
3800 X509_free(cert);
3801 sk_X509_free(certs);
3802 certs = NULL;
3803 }
3804 if (certs && conn->peer_issuer_issuer) {
3805 cert = X509_dup(conn->peer_issuer_issuer);
3806 if (cert && !sk_X509_push(certs, cert)) {
3807 tls_show_errors(
3808 MSG_INFO, __func__,
3809 "OpenSSL: Could not add issuer's issuer to OCSP responder trust store");
3810 X509_free(cert);
3811 }
3812 }
3813 }
3814 }
3815
3816 status = OCSP_basic_verify(basic, certs, store, OCSP_TRUSTOTHER);
3817 sk_X509_pop_free(certs, X509_free);
3818 if (status <= 0) {
3819 tls_show_errors(MSG_INFO, __func__,
3820 "OpenSSL: OCSP response failed verification");
3821 OCSP_BASICRESP_free(basic);
3822 OCSP_RESPONSE_free(rsp);
3823 return 0;
3824 }
3825
3826 wpa_printf(MSG_DEBUG, "OpenSSL: OCSP response verification succeeded");
3827
3828 if (!conn->peer_cert) {
3829 wpa_printf(MSG_DEBUG, "OpenSSL: Peer certificate not available for OCSP status check");
3830 OCSP_BASICRESP_free(basic);
3831 OCSP_RESPONSE_free(rsp);
3832 return 0;
3833 }
3834
3835 if (!conn->peer_issuer) {
3836 wpa_printf(MSG_DEBUG, "OpenSSL: Peer issuer certificate not available for OCSP status check");
3837 OCSP_BASICRESP_free(basic);
3838 OCSP_RESPONSE_free(rsp);
3839 return 0;
3840 }
3841
3842 id = OCSP_cert_to_id(NULL, conn->peer_cert, conn->peer_issuer);
3843 if (!id) {
3844 wpa_printf(MSG_DEBUG, "OpenSSL: Could not create OCSP certificate identifier");
3845 OCSP_BASICRESP_free(basic);
3846 OCSP_RESPONSE_free(rsp);
3847 return 0;
3848 }
3849
3850 if (!OCSP_resp_find_status(basic, id, &status, &reason, &produced_at,
3851 &this_update, &next_update)) {
3852 wpa_printf(MSG_INFO, "OpenSSL: Could not find current server certificate from OCSP response%s",
3853 (conn->flags & TLS_CONN_REQUIRE_OCSP) ? "" :
3854 " (OCSP not required)");
3855 OCSP_CERTID_free(id);
3856 OCSP_BASICRESP_free(basic);
3857 OCSP_RESPONSE_free(rsp);
3858 return (conn->flags & TLS_CONN_REQUIRE_OCSP) ? 0 : 1;
3859 }
3860 OCSP_CERTID_free(id);
3861
3862 if (!OCSP_check_validity(this_update, next_update, 5 * 60, -1)) {
3863 tls_show_errors(MSG_INFO, __func__,
3864 "OpenSSL: OCSP status times invalid");
3865 OCSP_BASICRESP_free(basic);
3866 OCSP_RESPONSE_free(rsp);
3867 return 0;
3868 }
3869
3870 OCSP_BASICRESP_free(basic);
3871 OCSP_RESPONSE_free(rsp);
3872
3873 wpa_printf(MSG_DEBUG, "OpenSSL: OCSP status for server certificate: %s",
3874 OCSP_cert_status_str(status));
3875
3876 if (status == V_OCSP_CERTSTATUS_GOOD)
3877 return 1;
3878 if (status == V_OCSP_CERTSTATUS_REVOKED)
3879 return 0;
3880 if (conn->flags & TLS_CONN_REQUIRE_OCSP) {
3881 wpa_printf(MSG_DEBUG, "OpenSSL: OCSP status unknown, but OCSP required");
3882 return 0;
3883 }
3884 wpa_printf(MSG_DEBUG, "OpenSSL: OCSP status unknown, but OCSP was not required, so allow connection to continue");
3885 return 1;
3886 }
3887
3888
3889 static int ocsp_status_cb(SSL *s, void *arg)
3890 {
3891 char *tmp;
3892 char *resp;
3893 size_t len;
3894
3895 if (tls_global->ocsp_stapling_response == NULL) {
3896 wpa_printf(MSG_DEBUG, "OpenSSL: OCSP status callback - no response configured");
3897 return SSL_TLSEXT_ERR_OK;
3898 }
3899
3900 resp = os_readfile(tls_global->ocsp_stapling_response, &len);
3901 if (resp == NULL) {
3902 wpa_printf(MSG_DEBUG, "OpenSSL: OCSP status callback - could not read response file");
3903 /* TODO: Build OCSPResponse with responseStatus = internalError
3904 */
3905 return SSL_TLSEXT_ERR_OK;
3906 }
3907 wpa_printf(MSG_DEBUG, "OpenSSL: OCSP status callback - send cached response");
3908 tmp = OPENSSL_malloc(len);
3909 if (tmp == NULL) {
3910 os_free(resp);
3911 return SSL_TLSEXT_ERR_ALERT_FATAL;
3912 }
3913
3914 os_memcpy(tmp, resp, len);
3915 os_free(resp);
3916 SSL_set_tlsext_status_ocsp_resp(s, tmp, len);
3917
3918 return SSL_TLSEXT_ERR_OK;
3919 }
3920
3921 #endif /* HAVE_OCSP */
3922
3923
3924 int tls_connection_set_params(void *tls_ctx, struct tls_connection *conn,
3925 const struct tls_connection_params *params)
3926 {
3927 struct tls_data *data = tls_ctx;
3928 int ret;
3929 unsigned long err;
3930 int can_pkcs11 = 0;
3931 const char *key_id = params->key_id;
3932 const char *cert_id = params->cert_id;
3933 const char *ca_cert_id = params->ca_cert_id;
3934 const char *engine_id = params->engine ? params->engine_id : NULL;
3935
3936 if (conn == NULL)
3937 return -1;
3938
3939 if (params->flags & TLS_CONN_REQUIRE_OCSP_ALL) {
3940 wpa_printf(MSG_INFO,
3941 "OpenSSL: ocsp=3 not supported");
3942 return -1;
3943 }
3944
3945 /*
3946 * If the engine isn't explicitly configured, and any of the
3947 * cert/key fields are actually PKCS#11 URIs, then automatically
3948 * use the PKCS#11 ENGINE.
3949 */
3950 if (!engine_id || os_strcmp(engine_id, "pkcs11") == 0)
3951 can_pkcs11 = 1;
3952
3953 if (!key_id && params->private_key && can_pkcs11 &&
3954 os_strncmp(params->private_key, "pkcs11:", 7) == 0) {
3955 can_pkcs11 = 2;
3956 key_id = params->private_key;
3957 }
3958
3959 if (!cert_id && params->client_cert && can_pkcs11 &&
3960 os_strncmp(params->client_cert, "pkcs11:", 7) == 0) {
3961 can_pkcs11 = 2;
3962 cert_id = params->client_cert;
3963 }
3964
3965 if (!ca_cert_id && params->ca_cert && can_pkcs11 &&
3966 os_strncmp(params->ca_cert, "pkcs11:", 7) == 0) {
3967 can_pkcs11 = 2;
3968 ca_cert_id = params->ca_cert;
3969 }
3970
3971 /* If we need to automatically enable the PKCS#11 ENGINE, do so. */
3972 if (can_pkcs11 == 2 && !engine_id)
3973 engine_id = "pkcs11";
3974
3975 #if defined(EAP_FAST) || defined(EAP_FAST_DYNAMIC) || defined(EAP_SERVER_FAST)
3976 #if OPENSSL_VERSION_NUMBER < 0x10100000L
3977 if (params->flags & TLS_CONN_EAP_FAST) {
3978 wpa_printf(MSG_DEBUG,
3979 "OpenSSL: Use TLSv1_method() for EAP-FAST");
3980 if (SSL_set_ssl_method(conn->ssl, TLSv1_method()) != 1) {
3981 tls_show_errors(MSG_INFO, __func__,
3982 "Failed to set TLSv1_method() for EAP-FAST");
3983 return -1;
3984 }
3985 }
3986 #endif
3987 #endif /* EAP_FAST || EAP_FAST_DYNAMIC || EAP_SERVER_FAST */
3988
3989 while ((err = ERR_get_error())) {
3990 wpa_printf(MSG_INFO, "%s: Clearing pending SSL error: %s",
3991 __func__, ERR_error_string(err, NULL));
3992 }
3993
3994 if (engine_id) {
3995 wpa_printf(MSG_DEBUG, "SSL: Initializing TLS engine");
3996 ret = tls_engine_init(conn, engine_id, params->pin,
3997 key_id, cert_id, ca_cert_id);
3998 if (ret)
3999 return ret;
4000 }
4001 if (tls_connection_set_subject_match(conn,
4002 params->subject_match,
4003 params->altsubject_match,
4004 params->suffix_match,
4005 params->domain_match))
4006 return -1;
4007
4008 if (engine_id && ca_cert_id) {
4009 if (tls_connection_engine_ca_cert(data, conn, ca_cert_id))
4010 return TLS_SET_PARAMS_ENGINE_PRV_VERIFY_FAILED;
4011 } else if (tls_connection_ca_cert(data, conn, params->ca_cert,
4012 params->ca_cert_blob,
4013 params->ca_cert_blob_len,
4014 params->ca_path))
4015 return -1;
4016
4017 if (engine_id && cert_id) {
4018 if (tls_connection_engine_client_cert(conn, cert_id))
4019 return TLS_SET_PARAMS_ENGINE_PRV_VERIFY_FAILED;
4020 } else if (tls_connection_client_cert(conn, params->client_cert,
4021 params->client_cert_blob,
4022 params->client_cert_blob_len))
4023 return -1;
4024
4025 if (engine_id && key_id) {
4026 wpa_printf(MSG_DEBUG, "TLS: Using private key from engine");
4027 if (tls_connection_engine_private_key(conn))
4028 return TLS_SET_PARAMS_ENGINE_PRV_VERIFY_FAILED;
4029 } else if (tls_connection_private_key(data, conn,
4030 params->private_key,
4031 params->private_key_passwd,
4032 params->private_key_blob,
4033 params->private_key_blob_len)) {
4034 wpa_printf(MSG_INFO, "TLS: Failed to load private key '%s'",
4035 params->private_key);
4036 return -1;
4037 }
4038
4039 if (tls_connection_dh(conn, params->dh_file)) {
4040 wpa_printf(MSG_INFO, "TLS: Failed to load DH file '%s'",
4041 params->dh_file);
4042 return -1;
4043 }
4044
4045 if (params->openssl_ciphers &&
4046 SSL_set_cipher_list(conn->ssl, params->openssl_ciphers) != 1) {
4047 wpa_printf(MSG_INFO,
4048 "OpenSSL: Failed to set cipher string '%s'",
4049 params->openssl_ciphers);
4050 return -1;
4051 }
4052
4053 tls_set_conn_flags(conn->ssl, params->flags);
4054
4055 #ifdef OPENSSL_IS_BORINGSSL
4056 if (params->flags & TLS_CONN_REQUEST_OCSP) {
4057 SSL_enable_ocsp_stapling(conn->ssl);
4058 }
4059 #else /* OPENSSL_IS_BORINGSSL */
4060 #ifdef HAVE_OCSP
4061 if (params->flags & TLS_CONN_REQUEST_OCSP) {
4062 SSL_CTX *ssl_ctx = data->ssl;
4063 SSL_set_tlsext_status_type(conn->ssl, TLSEXT_STATUSTYPE_ocsp);
4064 SSL_CTX_set_tlsext_status_cb(ssl_ctx, ocsp_resp_cb);
4065 SSL_CTX_set_tlsext_status_arg(ssl_ctx, conn);
4066 }
4067 #else /* HAVE_OCSP */
4068 if (params->flags & TLS_CONN_REQUIRE_OCSP) {
4069 wpa_printf(MSG_INFO,
4070 "OpenSSL: No OCSP support included - reject configuration");
4071 return -1;
4072 }
4073 if (params->flags & TLS_CONN_REQUEST_OCSP) {
4074 wpa_printf(MSG_DEBUG,
4075 "OpenSSL: No OCSP support included - allow optional OCSP case to continue");
4076 }
4077 #endif /* HAVE_OCSP */
4078 #endif /* OPENSSL_IS_BORINGSSL */
4079
4080 conn->flags = params->flags;
4081
4082 tls_get_errors(data);
4083
4084 return 0;
4085 }
4086
4087
4088 int tls_global_set_params(void *tls_ctx,
4089 const struct tls_connection_params *params)
4090 {
4091 struct tls_data *data = tls_ctx;
4092 SSL_CTX *ssl_ctx = data->ssl;
4093 unsigned long err;
4094
4095 while ((err = ERR_get_error())) {
4096 wpa_printf(MSG_INFO, "%s: Clearing pending SSL error: %s",
4097 __func__, ERR_error_string(err, NULL));
4098 }
4099
4100 if (tls_global_ca_cert(data, params->ca_cert) ||
4101 tls_global_client_cert(data, params->client_cert) ||
4102 tls_global_private_key(data, params->private_key,
4103 params->private_key_passwd) ||
4104 tls_global_dh(data, params->dh_file)) {
4105 wpa_printf(MSG_INFO, "TLS: Failed to set global parameters");
4106 return -1;
4107 }
4108
4109 if (params->openssl_ciphers &&
4110 SSL_CTX_set_cipher_list(ssl_ctx, params->openssl_ciphers) != 1) {
4111 wpa_printf(MSG_INFO,
4112 "OpenSSL: Failed to set cipher string '%s'",
4113 params->openssl_ciphers);
4114 return -1;
4115 }
4116
4117 #ifdef SSL_OP_NO_TICKET
4118 if (params->flags & TLS_CONN_DISABLE_SESSION_TICKET)
4119 SSL_CTX_set_options(ssl_ctx, SSL_OP_NO_TICKET);
4120 #ifdef SSL_CTX_clear_options
4121 else
4122 SSL_CTX_clear_options(ssl_ctx, SSL_OP_NO_TICKET);
4123 #endif /* SSL_clear_options */
4124 #endif /* SSL_OP_NO_TICKET */
4125
4126 #ifdef HAVE_OCSP
4127 SSL_CTX_set_tlsext_status_cb(ssl_ctx, ocsp_status_cb);
4128 SSL_CTX_set_tlsext_status_arg(ssl_ctx, ssl_ctx);
4129 os_free(tls_global->ocsp_stapling_response);
4130 if (params->ocsp_stapling_response)
4131 tls_global->ocsp_stapling_response =
4132 os_strdup(params->ocsp_stapling_response);
4133 else
4134 tls_global->ocsp_stapling_response = NULL;
4135 #endif /* HAVE_OCSP */
4136
4137 return 0;
4138 }
4139
4140
4141 #if defined(EAP_FAST) || defined(EAP_FAST_DYNAMIC) || defined(EAP_SERVER_FAST)
4142 /* Pre-shared secred requires a patch to openssl, so this function is
4143 * commented out unless explicitly needed for EAP-FAST in order to be able to
4144 * build this file with unmodified openssl. */
4145
4146 #if (defined(OPENSSL_IS_BORINGSSL) || OPENSSL_VERSION_NUMBER >= 0x10100000L) && !defined(LIBRESSL_VERSION_NUMBER)
4147 static int tls_sess_sec_cb(SSL *s, void *secret, int *secret_len,
4148 STACK_OF(SSL_CIPHER) *peer_ciphers,
4149 const SSL_CIPHER **cipher, void *arg)
4150 #else /* OPENSSL_IS_BORINGSSL */
4151 static int tls_sess_sec_cb(SSL *s, void *secret, int *secret_len,
4152 STACK_OF(SSL_CIPHER) *peer_ciphers,
4153 SSL_CIPHER **cipher, void *arg)
4154 #endif /* OPENSSL_IS_BORINGSSL */
4155 {
4156 struct tls_connection *conn = arg;
4157 int ret;
4158
4159 #if OPENSSL_VERSION_NUMBER < 0x10100000L || defined(LIBRESSL_VERSION_NUMBER)
4160 if (conn == NULL || conn->session_ticket_cb == NULL)
4161 return 0;
4162
4163 ret = conn->session_ticket_cb(conn->session_ticket_cb_ctx,
4164 conn->session_ticket,
4165 conn->session_ticket_len,
4166 s->s3->client_random,
4167 s->s3->server_random, secret);
4168 #else
4169 unsigned char client_random[SSL3_RANDOM_SIZE];
4170 unsigned char server_random[SSL3_RANDOM_SIZE];
4171
4172 if (conn == NULL || conn->session_ticket_cb == NULL)
4173 return 0;
4174
4175 SSL_get_client_random(s, client_random, sizeof(client_random));
4176 SSL_get_server_random(s, server_random, sizeof(server_random));
4177
4178 ret = conn->session_ticket_cb(conn->session_ticket_cb_ctx,
4179 conn->session_ticket,
4180 conn->session_ticket_len,
4181 client_random,
4182 server_random, secret);
4183 #endif
4184
4185 os_free(conn->session_ticket);
4186 conn->session_ticket = NULL;
4187
4188 if (ret <= 0)
4189 return 0;
4190
4191 *secret_len = SSL_MAX_MASTER_KEY_LENGTH;
4192 return 1;
4193 }
4194
4195
4196 static int tls_session_ticket_ext_cb(SSL *s, const unsigned char *data,
4197 int len, void *arg)
4198 {
4199 struct tls_connection *conn = arg;
4200
4201 if (conn == NULL || conn->session_ticket_cb == NULL)
4202 return 0;
4203
4204 wpa_printf(MSG_DEBUG, "OpenSSL: %s: length=%d", __func__, len);
4205
4206 os_free(conn->session_ticket);
4207 conn->session_ticket = NULL;
4208
4209 wpa_hexdump(MSG_DEBUG, "OpenSSL: ClientHello SessionTicket "
4210 "extension", data, len);
4211
4212 conn->session_ticket = os_malloc(len);
4213 if (conn->session_ticket == NULL)
4214 return 0;
4215
4216 os_memcpy(conn->session_ticket, data, len);
4217 conn->session_ticket_len = len;
4218
4219 return 1;
4220 }
4221 #endif /* EAP_FAST || EAP_FAST_DYNAMIC || EAP_SERVER_FAST */
4222
4223
4224 int tls_connection_set_session_ticket_cb(void *tls_ctx,
4225 struct tls_connection *conn,
4226 tls_session_ticket_cb cb,
4227 void *ctx)
4228 {
4229 #if defined(EAP_FAST) || defined(EAP_FAST_DYNAMIC) || defined(EAP_SERVER_FAST)
4230 conn->session_ticket_cb = cb;
4231 conn->session_ticket_cb_ctx = ctx;
4232
4233 if (cb) {
4234 if (SSL_set_session_secret_cb(conn->ssl, tls_sess_sec_cb,
4235 conn) != 1)
4236 return -1;
4237 SSL_set_session_ticket_ext_cb(conn->ssl,
4238 tls_session_ticket_ext_cb, conn);
4239 } else {
4240 if (SSL_set_session_secret_cb(conn->ssl, NULL, NULL) != 1)
4241 return -1;
4242 SSL_set_session_ticket_ext_cb(conn->ssl, NULL, NULL);
4243 }
4244
4245 return 0;
4246 #else /* EAP_FAST || EAP_FAST_DYNAMIC || EAP_SERVER_FAST */
4247 return -1;
4248 #endif /* EAP_FAST || EAP_FAST_DYNAMIC || EAP_SERVER_FAST */
4249 }
4250
4251
4252 int tls_get_library_version(char *buf, size_t buf_len)
4253 {
4254 #if OPENSSL_VERSION_NUMBER >= 0x10100000L && !defined(LIBRESSL_VERSION_NUMBER)
4255 return os_snprintf(buf, buf_len, "OpenSSL build=%s run=%s",
4256 OPENSSL_VERSION_TEXT,
4257 OpenSSL_version(OPENSSL_VERSION));
4258 #else
4259 return os_snprintf(buf, buf_len, "OpenSSL build=%s run=%s",
4260 OPENSSL_VERSION_TEXT,
4261 SSLeay_version(SSLEAY_VERSION));
4262 #endif
4263 }
4264
4265
4266 void tls_connection_set_success_data(struct tls_connection *conn,
4267 struct wpabuf *data)
4268 {
4269 SSL_SESSION *sess;
4270 struct wpabuf *old;
4271
4272 if (tls_ex_idx_session < 0)
4273 goto fail;
4274 sess = SSL_get_session(conn->ssl);
4275 if (!sess)
4276 goto fail;
4277 old = SSL_SESSION_get_ex_data(sess, tls_ex_idx_session);
4278 if (old) {
4279 wpa_printf(MSG_DEBUG, "OpenSSL: Replacing old success data %p",
4280 old);
4281 wpabuf_free(old);
4282 }
4283 if (SSL_SESSION_set_ex_data(sess, tls_ex_idx_session, data) != 1)
4284 goto fail;
4285
4286 wpa_printf(MSG_DEBUG, "OpenSSL: Stored success data %p", data);
4287 conn->success_data = 1;
4288 return;
4289
4290 fail:
4291 wpa_printf(MSG_INFO, "OpenSSL: Failed to store success data");
4292 wpabuf_free(data);
4293 }
4294
4295
4296 void tls_connection_set_success_data_resumed(struct tls_connection *conn)
4297 {
4298 wpa_printf(MSG_DEBUG,
4299 "OpenSSL: Success data accepted for resumed session");
4300 conn->success_data = 1;
4301 }
4302
4303
4304 const struct wpabuf *
4305 tls_connection_get_success_data(struct tls_connection *conn)
4306 {
4307 SSL_SESSION *sess;
4308
4309 if (tls_ex_idx_session < 0 ||
4310 !(sess = SSL_get_session(conn->ssl)))
4311 return NULL;
4312 return SSL_SESSION_get_ex_data(sess, tls_ex_idx_session);
4313 }
4314
4315
4316 void tls_connection_remove_session(struct tls_connection *conn)
4317 {
4318 SSL_SESSION *sess;
4319
4320 sess = SSL_get_session(conn->ssl);
4321 if (!sess)
4322 return;
4323
4324 if (SSL_CTX_remove_session(conn->ssl_ctx, sess) != 1)
4325 wpa_printf(MSG_DEBUG,
4326 "OpenSSL: Session was not cached");
4327 else
4328 wpa_printf(MSG_DEBUG,
4329 "OpenSSL: Removed cached session to disable session resumption");
4330 }
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