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
39 #if OPENSSL_VERSION_NUMBER < 0x10000000L
40 /* ERR_remove_thread_state replaces ERR_remove_state and the latter is
41 * deprecated. However, OpenSSL 0.9.8 doesn't include
42 * ERR_remove_thread_state. */
43 #define ERR_remove_thread_state(tid) ERR_remove_state(0)
44 #endif
45
46 #if defined(OPENSSL_IS_BORINGSSL)
47 /* stack_index_t is the return type of OpenSSL's sk_XXX_num() functions. */
48 typedef size_t stack_index_t;
49 #else
50 typedef int stack_index_t;
51 #endif
52
53 #ifdef SSL_set_tlsext_status_type
54 #ifndef OPENSSL_NO_TLSEXT
55 #define HAVE_OCSP
56 #include <openssl/ocsp.h>
57 #endif /* OPENSSL_NO_TLSEXT */
58 #endif /* SSL_set_tlsext_status_type */
59
60 #ifdef ANDROID
61 #include <openssl/pem.h>
62 #include <keystore/keystore_get.h>
63
BIO_from_keystore(const char * key)64 static BIO * BIO_from_keystore(const char *key)
65 {
66 BIO *bio = NULL;
67 uint8_t *value = NULL;
68 int length = keystore_get(key, strlen(key), &value);
69 if (length != -1 && (bio = BIO_new(BIO_s_mem())) != NULL)
70 BIO_write(bio, value, length);
71 free(value);
72 return bio;
73 }
74 #endif /* ANDROID */
75
76 static int tls_openssl_ref_count = 0;
77 static int tls_ex_idx_session = -1;
78
79 struct tls_context {
80 void (*event_cb)(void *ctx, enum tls_event ev,
81 union tls_event_data *data);
82 void *cb_ctx;
83 int cert_in_cb;
84 char *ocsp_stapling_response;
85 };
86
87 static struct tls_context *tls_global = NULL;
88
89
90 struct tls_data {
91 SSL_CTX *ssl;
92 unsigned int tls_session_lifetime;
93 };
94
95 struct tls_connection {
96 struct tls_context *context;
97 SSL_CTX *ssl_ctx;
98 SSL *ssl;
99 BIO *ssl_in, *ssl_out;
100 #ifndef OPENSSL_NO_ENGINE
101 ENGINE *engine; /* functional reference to the engine */
102 EVP_PKEY *private_key; /* the private key if using engine */
103 #endif /* OPENSSL_NO_ENGINE */
104 char *subject_match, *altsubject_match, *suffix_match, *domain_match;
105 int read_alerts, write_alerts, failed;
106
107 tls_session_ticket_cb session_ticket_cb;
108 void *session_ticket_cb_ctx;
109
110 /* SessionTicket received from OpenSSL hello_extension_cb (server) */
111 u8 *session_ticket;
112 size_t session_ticket_len;
113
114 unsigned int ca_cert_verify:1;
115 unsigned int cert_probe:1;
116 unsigned int server_cert_only:1;
117 unsigned int invalid_hb_used:1;
118 unsigned int success_data:1;
119
120 u8 srv_cert_hash[32];
121
122 unsigned int flags;
123
124 X509 *peer_cert;
125 X509 *peer_issuer;
126 X509 *peer_issuer_issuer;
127
128 #if OPENSSL_VERSION_NUMBER >= 0x10100000L
129 unsigned char client_random[SSL3_RANDOM_SIZE];
130 unsigned char server_random[SSL3_RANDOM_SIZE];
131 #endif
132 };
133
134
tls_context_new(const struct tls_config * conf)135 static struct tls_context * tls_context_new(const struct tls_config *conf)
136 {
137 struct tls_context *context = os_zalloc(sizeof(*context));
138 if (context == NULL)
139 return NULL;
140 if (conf) {
141 context->event_cb = conf->event_cb;
142 context->cb_ctx = conf->cb_ctx;
143 context->cert_in_cb = conf->cert_in_cb;
144 }
145 return context;
146 }
147
148
149 #ifdef CONFIG_NO_STDOUT_DEBUG
150
_tls_show_errors(void)151 static void _tls_show_errors(void)
152 {
153 unsigned long err;
154
155 while ((err = ERR_get_error())) {
156 /* Just ignore the errors, since stdout is disabled */
157 }
158 }
159 #define tls_show_errors(l, f, t) _tls_show_errors()
160
161 #else /* CONFIG_NO_STDOUT_DEBUG */
162
tls_show_errors(int level,const char * func,const char * txt)163 static void tls_show_errors(int level, const char *func, const char *txt)
164 {
165 unsigned long err;
166
167 wpa_printf(level, "OpenSSL: %s - %s %s",
168 func, txt, ERR_error_string(ERR_get_error(), NULL));
169
170 while ((err = ERR_get_error())) {
171 wpa_printf(MSG_INFO, "OpenSSL: pending error: %s",
172 ERR_error_string(err, NULL));
173 }
174 }
175
176 #endif /* CONFIG_NO_STDOUT_DEBUG */
177
178
179 #ifdef CONFIG_NATIVE_WINDOWS
180
181 /* Windows CryptoAPI and access to certificate stores */
182 #include <wincrypt.h>
183
184 #ifdef __MINGW32_VERSION
185 /*
186 * MinGW does not yet include all the needed definitions for CryptoAPI, so
187 * define here whatever extra is needed.
188 */
189 #define CERT_SYSTEM_STORE_CURRENT_USER (1 << 16)
190 #define CERT_STORE_READONLY_FLAG 0x00008000
191 #define CERT_STORE_OPEN_EXISTING_FLAG 0x00004000
192
193 #endif /* __MINGW32_VERSION */
194
195
196 struct cryptoapi_rsa_data {
197 const CERT_CONTEXT *cert;
198 HCRYPTPROV crypt_prov;
199 DWORD key_spec;
200 BOOL free_crypt_prov;
201 };
202
203
cryptoapi_error(const char * msg)204 static void cryptoapi_error(const char *msg)
205 {
206 wpa_printf(MSG_INFO, "CryptoAPI: %s; err=%u",
207 msg, (unsigned int) GetLastError());
208 }
209
210
cryptoapi_rsa_pub_enc(int flen,const unsigned char * from,unsigned char * to,RSA * rsa,int padding)211 static int cryptoapi_rsa_pub_enc(int flen, const unsigned char *from,
212 unsigned char *to, RSA *rsa, int padding)
213 {
214 wpa_printf(MSG_DEBUG, "%s - not implemented", __func__);
215 return 0;
216 }
217
218
cryptoapi_rsa_pub_dec(int flen,const unsigned char * from,unsigned char * to,RSA * rsa,int padding)219 static int cryptoapi_rsa_pub_dec(int flen, const unsigned char *from,
220 unsigned char *to, RSA *rsa, int padding)
221 {
222 wpa_printf(MSG_DEBUG, "%s - not implemented", __func__);
223 return 0;
224 }
225
226
cryptoapi_rsa_priv_enc(int flen,const unsigned char * from,unsigned char * to,RSA * rsa,int padding)227 static int cryptoapi_rsa_priv_enc(int flen, const unsigned char *from,
228 unsigned char *to, RSA *rsa, int padding)
229 {
230 struct cryptoapi_rsa_data *priv =
231 (struct cryptoapi_rsa_data *) rsa->meth->app_data;
232 HCRYPTHASH hash;
233 DWORD hash_size, len, i;
234 unsigned char *buf = NULL;
235 int ret = 0;
236
237 if (priv == NULL) {
238 RSAerr(RSA_F_RSA_EAY_PRIVATE_ENCRYPT,
239 ERR_R_PASSED_NULL_PARAMETER);
240 return 0;
241 }
242
243 if (padding != RSA_PKCS1_PADDING) {
244 RSAerr(RSA_F_RSA_EAY_PRIVATE_ENCRYPT,
245 RSA_R_UNKNOWN_PADDING_TYPE);
246 return 0;
247 }
248
249 if (flen != 16 /* MD5 */ + 20 /* SHA-1 */) {
250 wpa_printf(MSG_INFO, "%s - only MD5-SHA1 hash supported",
251 __func__);
252 RSAerr(RSA_F_RSA_EAY_PRIVATE_ENCRYPT,
253 RSA_R_INVALID_MESSAGE_LENGTH);
254 return 0;
255 }
256
257 if (!CryptCreateHash(priv->crypt_prov, CALG_SSL3_SHAMD5, 0, 0, &hash))
258 {
259 cryptoapi_error("CryptCreateHash failed");
260 return 0;
261 }
262
263 len = sizeof(hash_size);
264 if (!CryptGetHashParam(hash, HP_HASHSIZE, (BYTE *) &hash_size, &len,
265 0)) {
266 cryptoapi_error("CryptGetHashParam failed");
267 goto err;
268 }
269
270 if ((int) hash_size != flen) {
271 wpa_printf(MSG_INFO, "CryptoAPI: Invalid hash size (%u != %d)",
272 (unsigned) hash_size, flen);
273 RSAerr(RSA_F_RSA_EAY_PRIVATE_ENCRYPT,
274 RSA_R_INVALID_MESSAGE_LENGTH);
275 goto err;
276 }
277 if (!CryptSetHashParam(hash, HP_HASHVAL, (BYTE * ) from, 0)) {
278 cryptoapi_error("CryptSetHashParam failed");
279 goto err;
280 }
281
282 len = RSA_size(rsa);
283 buf = os_malloc(len);
284 if (buf == NULL) {
285 RSAerr(RSA_F_RSA_EAY_PRIVATE_ENCRYPT, ERR_R_MALLOC_FAILURE);
286 goto err;
287 }
288
289 if (!CryptSignHash(hash, priv->key_spec, NULL, 0, buf, &len)) {
290 cryptoapi_error("CryptSignHash failed");
291 goto err;
292 }
293
294 for (i = 0; i < len; i++)
295 to[i] = buf[len - i - 1];
296 ret = len;
297
298 err:
299 os_free(buf);
300 CryptDestroyHash(hash);
301
302 return ret;
303 }
304
305
cryptoapi_rsa_priv_dec(int flen,const unsigned char * from,unsigned char * to,RSA * rsa,int padding)306 static int cryptoapi_rsa_priv_dec(int flen, const unsigned char *from,
307 unsigned char *to, RSA *rsa, int padding)
308 {
309 wpa_printf(MSG_DEBUG, "%s - not implemented", __func__);
310 return 0;
311 }
312
313
cryptoapi_free_data(struct cryptoapi_rsa_data * priv)314 static void cryptoapi_free_data(struct cryptoapi_rsa_data *priv)
315 {
316 if (priv == NULL)
317 return;
318 if (priv->crypt_prov && priv->free_crypt_prov)
319 CryptReleaseContext(priv->crypt_prov, 0);
320 if (priv->cert)
321 CertFreeCertificateContext(priv->cert);
322 os_free(priv);
323 }
324
325
cryptoapi_finish(RSA * rsa)326 static int cryptoapi_finish(RSA *rsa)
327 {
328 cryptoapi_free_data((struct cryptoapi_rsa_data *) rsa->meth->app_data);
329 os_free((void *) rsa->meth);
330 rsa->meth = NULL;
331 return 1;
332 }
333
334
cryptoapi_find_cert(const char * name,DWORD store)335 static const CERT_CONTEXT * cryptoapi_find_cert(const char *name, DWORD store)
336 {
337 HCERTSTORE cs;
338 const CERT_CONTEXT *ret = NULL;
339
340 cs = CertOpenStore((LPCSTR) CERT_STORE_PROV_SYSTEM, 0, 0,
341 store | CERT_STORE_OPEN_EXISTING_FLAG |
342 CERT_STORE_READONLY_FLAG, L"MY");
343 if (cs == NULL) {
344 cryptoapi_error("Failed to open 'My system store'");
345 return NULL;
346 }
347
348 if (strncmp(name, "cert://", 7) == 0) {
349 unsigned short wbuf[255];
350 MultiByteToWideChar(CP_ACP, 0, name + 7, -1, wbuf, 255);
351 ret = CertFindCertificateInStore(cs, X509_ASN_ENCODING |
352 PKCS_7_ASN_ENCODING,
353 0, CERT_FIND_SUBJECT_STR,
354 wbuf, NULL);
355 } else if (strncmp(name, "hash://", 7) == 0) {
356 CRYPT_HASH_BLOB blob;
357 int len;
358 const char *hash = name + 7;
359 unsigned char *buf;
360
361 len = os_strlen(hash) / 2;
362 buf = os_malloc(len);
363 if (buf && hexstr2bin(hash, buf, len) == 0) {
364 blob.cbData = len;
365 blob.pbData = buf;
366 ret = CertFindCertificateInStore(cs,
367 X509_ASN_ENCODING |
368 PKCS_7_ASN_ENCODING,
369 0, CERT_FIND_HASH,
370 &blob, NULL);
371 }
372 os_free(buf);
373 }
374
375 CertCloseStore(cs, 0);
376
377 return ret;
378 }
379
380
tls_cryptoapi_cert(SSL * ssl,const char * name)381 static int tls_cryptoapi_cert(SSL *ssl, const char *name)
382 {
383 X509 *cert = NULL;
384 RSA *rsa = NULL, *pub_rsa;
385 struct cryptoapi_rsa_data *priv;
386 RSA_METHOD *rsa_meth;
387
388 if (name == NULL ||
389 (strncmp(name, "cert://", 7) != 0 &&
390 strncmp(name, "hash://", 7) != 0))
391 return -1;
392
393 priv = os_zalloc(sizeof(*priv));
394 rsa_meth = os_zalloc(sizeof(*rsa_meth));
395 if (priv == NULL || rsa_meth == NULL) {
396 wpa_printf(MSG_WARNING, "CryptoAPI: Failed to allocate memory "
397 "for CryptoAPI RSA method");
398 os_free(priv);
399 os_free(rsa_meth);
400 return -1;
401 }
402
403 priv->cert = cryptoapi_find_cert(name, CERT_SYSTEM_STORE_CURRENT_USER);
404 if (priv->cert == NULL) {
405 priv->cert = cryptoapi_find_cert(
406 name, CERT_SYSTEM_STORE_LOCAL_MACHINE);
407 }
408 if (priv->cert == NULL) {
409 wpa_printf(MSG_INFO, "CryptoAPI: Could not find certificate "
410 "'%s'", name);
411 goto err;
412 }
413
414 cert = d2i_X509(NULL,
415 (const unsigned char **) &priv->cert->pbCertEncoded,
416 priv->cert->cbCertEncoded);
417 if (cert == NULL) {
418 wpa_printf(MSG_INFO, "CryptoAPI: Could not process X509 DER "
419 "encoding");
420 goto err;
421 }
422
423 if (!CryptAcquireCertificatePrivateKey(priv->cert,
424 CRYPT_ACQUIRE_COMPARE_KEY_FLAG,
425 NULL, &priv->crypt_prov,
426 &priv->key_spec,
427 &priv->free_crypt_prov)) {
428 cryptoapi_error("Failed to acquire a private key for the "
429 "certificate");
430 goto err;
431 }
432
433 rsa_meth->name = "Microsoft CryptoAPI RSA Method";
434 rsa_meth->rsa_pub_enc = cryptoapi_rsa_pub_enc;
435 rsa_meth->rsa_pub_dec = cryptoapi_rsa_pub_dec;
436 rsa_meth->rsa_priv_enc = cryptoapi_rsa_priv_enc;
437 rsa_meth->rsa_priv_dec = cryptoapi_rsa_priv_dec;
438 rsa_meth->finish = cryptoapi_finish;
439 rsa_meth->flags = RSA_METHOD_FLAG_NO_CHECK;
440 rsa_meth->app_data = (char *) priv;
441
442 rsa = RSA_new();
443 if (rsa == NULL) {
444 SSLerr(SSL_F_SSL_CTX_USE_CERTIFICATE_FILE,
445 ERR_R_MALLOC_FAILURE);
446 goto err;
447 }
448
449 if (!SSL_use_certificate(ssl, cert)) {
450 RSA_free(rsa);
451 rsa = NULL;
452 goto err;
453 }
454 pub_rsa = cert->cert_info->key->pkey->pkey.rsa;
455 X509_free(cert);
456 cert = NULL;
457
458 rsa->n = BN_dup(pub_rsa->n);
459 rsa->e = BN_dup(pub_rsa->e);
460 if (!RSA_set_method(rsa, rsa_meth))
461 goto err;
462
463 if (!SSL_use_RSAPrivateKey(ssl, rsa))
464 goto err;
465 RSA_free(rsa);
466
467 return 0;
468
469 err:
470 if (cert)
471 X509_free(cert);
472 if (rsa)
473 RSA_free(rsa);
474 else {
475 os_free(rsa_meth);
476 cryptoapi_free_data(priv);
477 }
478 return -1;
479 }
480
481
tls_cryptoapi_ca_cert(SSL_CTX * ssl_ctx,SSL * ssl,const char * name)482 static int tls_cryptoapi_ca_cert(SSL_CTX *ssl_ctx, SSL *ssl, const char *name)
483 {
484 HCERTSTORE cs;
485 PCCERT_CONTEXT ctx = NULL;
486 X509 *cert;
487 char buf[128];
488 const char *store;
489 #ifdef UNICODE
490 WCHAR *wstore;
491 #endif /* UNICODE */
492
493 if (name == NULL || strncmp(name, "cert_store://", 13) != 0)
494 return -1;
495
496 store = name + 13;
497 #ifdef UNICODE
498 wstore = os_malloc((os_strlen(store) + 1) * sizeof(WCHAR));
499 if (wstore == NULL)
500 return -1;
501 wsprintf(wstore, L"%S", store);
502 cs = CertOpenSystemStore(0, wstore);
503 os_free(wstore);
504 #else /* UNICODE */
505 cs = CertOpenSystemStore(0, store);
506 #endif /* UNICODE */
507 if (cs == NULL) {
508 wpa_printf(MSG_DEBUG, "%s: failed to open system cert store "
509 "'%s': error=%d", __func__, store,
510 (int) GetLastError());
511 return -1;
512 }
513
514 while ((ctx = CertEnumCertificatesInStore(cs, ctx))) {
515 cert = d2i_X509(NULL,
516 (const unsigned char **) &ctx->pbCertEncoded,
517 ctx->cbCertEncoded);
518 if (cert == NULL) {
519 wpa_printf(MSG_INFO, "CryptoAPI: Could not process "
520 "X509 DER encoding for CA cert");
521 continue;
522 }
523
524 X509_NAME_oneline(X509_get_subject_name(cert), buf,
525 sizeof(buf));
526 wpa_printf(MSG_DEBUG, "OpenSSL: Loaded CA certificate for "
527 "system certificate store: subject='%s'", buf);
528
529 if (!X509_STORE_add_cert(ssl_ctx->cert_store, cert)) {
530 tls_show_errors(MSG_WARNING, __func__,
531 "Failed to add ca_cert to OpenSSL "
532 "certificate store");
533 }
534
535 X509_free(cert);
536 }
537
538 if (!CertCloseStore(cs, 0)) {
539 wpa_printf(MSG_DEBUG, "%s: failed to close system cert store "
540 "'%s': error=%d", __func__, name + 13,
541 (int) GetLastError());
542 }
543
544 return 0;
545 }
546
547
548 #else /* CONFIG_NATIVE_WINDOWS */
549
tls_cryptoapi_cert(SSL * ssl,const char * name)550 static int tls_cryptoapi_cert(SSL *ssl, const char *name)
551 {
552 return -1;
553 }
554
555 #endif /* CONFIG_NATIVE_WINDOWS */
556
557
ssl_info_cb(const SSL * ssl,int where,int ret)558 static void ssl_info_cb(const SSL *ssl, int where, int ret)
559 {
560 const char *str;
561 int w;
562
563 wpa_printf(MSG_DEBUG, "SSL: (where=0x%x ret=0x%x)", where, ret);
564 w = where & ~SSL_ST_MASK;
565 if (w & SSL_ST_CONNECT)
566 str = "SSL_connect";
567 else if (w & SSL_ST_ACCEPT)
568 str = "SSL_accept";
569 else
570 str = "undefined";
571
572 if (where & SSL_CB_LOOP) {
573 wpa_printf(MSG_DEBUG, "SSL: %s:%s",
574 str, SSL_state_string_long(ssl));
575 } else if (where & SSL_CB_ALERT) {
576 struct tls_connection *conn = SSL_get_app_data((SSL *) ssl);
577 wpa_printf(MSG_INFO, "SSL: SSL3 alert: %s:%s:%s",
578 where & SSL_CB_READ ?
579 "read (remote end reported an error)" :
580 "write (local SSL3 detected an error)",
581 SSL_alert_type_string_long(ret),
582 SSL_alert_desc_string_long(ret));
583 if ((ret >> 8) == SSL3_AL_FATAL) {
584 if (where & SSL_CB_READ)
585 conn->read_alerts++;
586 else
587 conn->write_alerts++;
588 }
589 if (conn->context->event_cb != NULL) {
590 union tls_event_data ev;
591 struct tls_context *context = conn->context;
592 os_memset(&ev, 0, sizeof(ev));
593 ev.alert.is_local = !(where & SSL_CB_READ);
594 ev.alert.type = SSL_alert_type_string_long(ret);
595 ev.alert.description = SSL_alert_desc_string_long(ret);
596 context->event_cb(context->cb_ctx, TLS_ALERT, &ev);
597 }
598 } else if (where & SSL_CB_EXIT && ret <= 0) {
599 wpa_printf(MSG_DEBUG, "SSL: %s:%s in %s",
600 str, ret == 0 ? "failed" : "error",
601 SSL_state_string_long(ssl));
602 }
603 }
604
605
606 #ifndef OPENSSL_NO_ENGINE
607 /**
608 * tls_engine_load_dynamic_generic - load any openssl engine
609 * @pre: an array of commands and values that load an engine initialized
610 * in the engine specific function
611 * @post: an array of commands and values that initialize an already loaded
612 * engine (or %NULL if not required)
613 * @id: the engine id of the engine to load (only required if post is not %NULL
614 *
615 * This function is a generic function that loads any openssl engine.
616 *
617 * Returns: 0 on success, -1 on failure
618 */
tls_engine_load_dynamic_generic(const char * pre[],const char * post[],const char * id)619 static int tls_engine_load_dynamic_generic(const char *pre[],
620 const char *post[], const char *id)
621 {
622 ENGINE *engine;
623 const char *dynamic_id = "dynamic";
624
625 engine = ENGINE_by_id(id);
626 if (engine) {
627 ENGINE_free(engine);
628 wpa_printf(MSG_DEBUG, "ENGINE: engine '%s' is already "
629 "available", id);
630 return 0;
631 }
632 ERR_clear_error();
633
634 engine = ENGINE_by_id(dynamic_id);
635 if (engine == NULL) {
636 wpa_printf(MSG_INFO, "ENGINE: Can't find engine %s [%s]",
637 dynamic_id,
638 ERR_error_string(ERR_get_error(), NULL));
639 return -1;
640 }
641
642 /* Perform the pre commands. This will load the engine. */
643 while (pre && pre[0]) {
644 wpa_printf(MSG_DEBUG, "ENGINE: '%s' '%s'", pre[0], pre[1]);
645 if (ENGINE_ctrl_cmd_string(engine, pre[0], pre[1], 0) == 0) {
646 wpa_printf(MSG_INFO, "ENGINE: ctrl cmd_string failed: "
647 "%s %s [%s]", pre[0], pre[1],
648 ERR_error_string(ERR_get_error(), NULL));
649 ENGINE_free(engine);
650 return -1;
651 }
652 pre += 2;
653 }
654
655 /*
656 * Free the reference to the "dynamic" engine. The loaded engine can
657 * now be looked up using ENGINE_by_id().
658 */
659 ENGINE_free(engine);
660
661 engine = ENGINE_by_id(id);
662 if (engine == NULL) {
663 wpa_printf(MSG_INFO, "ENGINE: Can't find engine %s [%s]",
664 id, ERR_error_string(ERR_get_error(), NULL));
665 return -1;
666 }
667
668 while (post && post[0]) {
669 wpa_printf(MSG_DEBUG, "ENGINE: '%s' '%s'", post[0], post[1]);
670 if (ENGINE_ctrl_cmd_string(engine, post[0], post[1], 0) == 0) {
671 wpa_printf(MSG_DEBUG, "ENGINE: ctrl cmd_string failed:"
672 " %s %s [%s]", post[0], post[1],
673 ERR_error_string(ERR_get_error(), NULL));
674 ENGINE_remove(engine);
675 ENGINE_free(engine);
676 return -1;
677 }
678 post += 2;
679 }
680 ENGINE_free(engine);
681
682 return 0;
683 }
684
685
686 /**
687 * tls_engine_load_dynamic_pkcs11 - load the pkcs11 engine provided by opensc
688 * @pkcs11_so_path: pksc11_so_path from the configuration
689 * @pcks11_module_path: pkcs11_module_path from the configuration
690 */
tls_engine_load_dynamic_pkcs11(const char * pkcs11_so_path,const char * pkcs11_module_path)691 static int tls_engine_load_dynamic_pkcs11(const char *pkcs11_so_path,
692 const char *pkcs11_module_path)
693 {
694 char *engine_id = "pkcs11";
695 const char *pre_cmd[] = {
696 "SO_PATH", NULL /* pkcs11_so_path */,
697 "ID", NULL /* engine_id */,
698 "LIST_ADD", "1",
699 /* "NO_VCHECK", "1", */
700 "LOAD", NULL,
701 NULL, NULL
702 };
703 const char *post_cmd[] = {
704 "MODULE_PATH", NULL /* pkcs11_module_path */,
705 NULL, NULL
706 };
707
708 if (!pkcs11_so_path)
709 return 0;
710
711 pre_cmd[1] = pkcs11_so_path;
712 pre_cmd[3] = engine_id;
713 if (pkcs11_module_path)
714 post_cmd[1] = pkcs11_module_path;
715 else
716 post_cmd[0] = NULL;
717
718 wpa_printf(MSG_DEBUG, "ENGINE: Loading pkcs11 Engine from %s",
719 pkcs11_so_path);
720
721 return tls_engine_load_dynamic_generic(pre_cmd, post_cmd, engine_id);
722 }
723
724
725 /**
726 * tls_engine_load_dynamic_opensc - load the opensc engine provided by opensc
727 * @opensc_so_path: opensc_so_path from the configuration
728 */
tls_engine_load_dynamic_opensc(const char * opensc_so_path)729 static int tls_engine_load_dynamic_opensc(const char *opensc_so_path)
730 {
731 char *engine_id = "opensc";
732 const char *pre_cmd[] = {
733 "SO_PATH", NULL /* opensc_so_path */,
734 "ID", NULL /* engine_id */,
735 "LIST_ADD", "1",
736 "LOAD", NULL,
737 NULL, NULL
738 };
739
740 if (!opensc_so_path)
741 return 0;
742
743 pre_cmd[1] = opensc_so_path;
744 pre_cmd[3] = engine_id;
745
746 wpa_printf(MSG_DEBUG, "ENGINE: Loading OpenSC Engine from %s",
747 opensc_so_path);
748
749 return tls_engine_load_dynamic_generic(pre_cmd, NULL, engine_id);
750 }
751 #endif /* OPENSSL_NO_ENGINE */
752
753
remove_session_cb(SSL_CTX * ctx,SSL_SESSION * sess)754 static void remove_session_cb(SSL_CTX *ctx, SSL_SESSION *sess)
755 {
756 struct wpabuf *buf;
757
758 if (tls_ex_idx_session < 0)
759 return;
760 buf = SSL_SESSION_get_ex_data(sess, tls_ex_idx_session);
761 if (!buf)
762 return;
763 wpa_printf(MSG_DEBUG,
764 "OpenSSL: Free application session data %p (sess %p)",
765 buf, sess);
766 wpabuf_free(buf);
767
768 SSL_SESSION_set_ex_data(sess, tls_ex_idx_session, NULL);
769 }
770
771
tls_init(const struct tls_config * conf)772 void * tls_init(const struct tls_config *conf)
773 {
774 struct tls_data *data;
775 SSL_CTX *ssl;
776 struct tls_context *context;
777 const char *ciphers;
778
779 if (tls_openssl_ref_count == 0) {
780 tls_global = context = tls_context_new(conf);
781 if (context == NULL)
782 return NULL;
783 #ifdef CONFIG_FIPS
784 #ifdef OPENSSL_FIPS
785 if (conf && conf->fips_mode) {
786 static int fips_enabled = 0;
787
788 if (!fips_enabled && !FIPS_mode_set(1)) {
789 wpa_printf(MSG_ERROR, "Failed to enable FIPS "
790 "mode");
791 ERR_load_crypto_strings();
792 ERR_print_errors_fp(stderr);
793 os_free(tls_global);
794 tls_global = NULL;
795 return NULL;
796 } else {
797 wpa_printf(MSG_INFO, "Running in FIPS mode");
798 fips_enabled = 1;
799 }
800 }
801 #else /* OPENSSL_FIPS */
802 if (conf && conf->fips_mode) {
803 wpa_printf(MSG_ERROR, "FIPS mode requested, but not "
804 "supported");
805 os_free(tls_global);
806 tls_global = NULL;
807 return NULL;
808 }
809 #endif /* OPENSSL_FIPS */
810 #endif /* CONFIG_FIPS */
811 SSL_load_error_strings();
812 SSL_library_init();
813 #ifndef OPENSSL_NO_SHA256
814 EVP_add_digest(EVP_sha256());
815 #endif /* OPENSSL_NO_SHA256 */
816 /* TODO: if /dev/urandom is available, PRNG is seeded
817 * automatically. If this is not the case, random data should
818 * be added here. */
819
820 #ifdef PKCS12_FUNCS
821 #ifndef OPENSSL_NO_RC2
822 /*
823 * 40-bit RC2 is commonly used in PKCS#12 files, so enable it.
824 * This is enabled by PKCS12_PBE_add() in OpenSSL 0.9.8
825 * versions, but it looks like OpenSSL 1.0.0 does not do that
826 * anymore.
827 */
828 EVP_add_cipher(EVP_rc2_40_cbc());
829 #endif /* OPENSSL_NO_RC2 */
830 PKCS12_PBE_add();
831 #endif /* PKCS12_FUNCS */
832 } else {
833 context = tls_context_new(conf);
834 if (context == NULL)
835 return NULL;
836 }
837 tls_openssl_ref_count++;
838
839 data = os_zalloc(sizeof(*data));
840 if (data)
841 ssl = SSL_CTX_new(SSLv23_method());
842 else
843 ssl = NULL;
844 if (ssl == NULL) {
845 tls_openssl_ref_count--;
846 if (context != tls_global)
847 os_free(context);
848 if (tls_openssl_ref_count == 0) {
849 os_free(tls_global);
850 tls_global = NULL;
851 }
852 return NULL;
853 }
854 data->ssl = ssl;
855 if (conf)
856 data->tls_session_lifetime = conf->tls_session_lifetime;
857
858 SSL_CTX_set_options(ssl, SSL_OP_NO_SSLv2);
859 SSL_CTX_set_options(ssl, SSL_OP_NO_SSLv3);
860
861 SSL_CTX_set_info_callback(ssl, ssl_info_cb);
862 SSL_CTX_set_app_data(ssl, context);
863 if (data->tls_session_lifetime > 0) {
864 SSL_CTX_set_quiet_shutdown(ssl, 1);
865 /*
866 * Set default context here. In practice, this will be replaced
867 * by the per-EAP method context in tls_connection_set_verify().
868 */
869 SSL_CTX_set_session_id_context(ssl, (u8 *) "hostapd", 7);
870 SSL_CTX_set_session_cache_mode(ssl, SSL_SESS_CACHE_SERVER);
871 SSL_CTX_set_timeout(ssl, data->tls_session_lifetime);
872 SSL_CTX_sess_set_remove_cb(ssl, remove_session_cb);
873 } else {
874 SSL_CTX_set_session_cache_mode(ssl, SSL_SESS_CACHE_OFF);
875 }
876
877 if (tls_ex_idx_session < 0) {
878 tls_ex_idx_session = SSL_SESSION_get_ex_new_index(
879 0, NULL, NULL, NULL, NULL);
880 if (tls_ex_idx_session < 0) {
881 tls_deinit(data);
882 return NULL;
883 }
884 }
885
886 #ifndef OPENSSL_NO_ENGINE
887 wpa_printf(MSG_DEBUG, "ENGINE: Loading dynamic engine");
888 ERR_load_ENGINE_strings();
889 ENGINE_load_dynamic();
890
891 if (conf &&
892 (conf->opensc_engine_path || conf->pkcs11_engine_path ||
893 conf->pkcs11_module_path)) {
894 if (tls_engine_load_dynamic_opensc(conf->opensc_engine_path) ||
895 tls_engine_load_dynamic_pkcs11(conf->pkcs11_engine_path,
896 conf->pkcs11_module_path)) {
897 tls_deinit(data);
898 return NULL;
899 }
900 }
901 #endif /* OPENSSL_NO_ENGINE */
902
903 if (conf && conf->openssl_ciphers)
904 ciphers = conf->openssl_ciphers;
905 else
906 ciphers = "DEFAULT:!EXP:!LOW";
907 if (SSL_CTX_set_cipher_list(ssl, ciphers) != 1) {
908 wpa_printf(MSG_ERROR,
909 "OpenSSL: Failed to set cipher string '%s'",
910 ciphers);
911 tls_deinit(data);
912 return NULL;
913 }
914
915 return data;
916 }
917
918
tls_deinit(void * ssl_ctx)919 void tls_deinit(void *ssl_ctx)
920 {
921 struct tls_data *data = ssl_ctx;
922 SSL_CTX *ssl = data->ssl;
923 struct tls_context *context = SSL_CTX_get_app_data(ssl);
924 if (context != tls_global)
925 os_free(context);
926 if (data->tls_session_lifetime > 0)
927 SSL_CTX_flush_sessions(ssl, 0);
928 SSL_CTX_free(ssl);
929
930 tls_openssl_ref_count--;
931 if (tls_openssl_ref_count == 0) {
932 #ifndef OPENSSL_NO_ENGINE
933 ENGINE_cleanup();
934 #endif /* OPENSSL_NO_ENGINE */
935 CRYPTO_cleanup_all_ex_data();
936 ERR_remove_thread_state(NULL);
937 ERR_free_strings();
938 EVP_cleanup();
939 os_free(tls_global->ocsp_stapling_response);
940 tls_global->ocsp_stapling_response = NULL;
941 os_free(tls_global);
942 tls_global = NULL;
943 }
944
945 os_free(data);
946 }
947
948
949 #ifndef OPENSSL_NO_ENGINE
950
951 /* Cryptoki return values */
952 #define CKR_PIN_INCORRECT 0x000000a0
953 #define CKR_PIN_INVALID 0x000000a1
954 #define CKR_PIN_LEN_RANGE 0x000000a2
955
956 /* libp11 */
957 #define ERR_LIB_PKCS11 ERR_LIB_USER
958
tls_is_pin_error(unsigned int err)959 static int tls_is_pin_error(unsigned int err)
960 {
961 return ERR_GET_LIB(err) == ERR_LIB_PKCS11 &&
962 (ERR_GET_REASON(err) == CKR_PIN_INCORRECT ||
963 ERR_GET_REASON(err) == CKR_PIN_INVALID ||
964 ERR_GET_REASON(err) == CKR_PIN_LEN_RANGE);
965 }
966
967 #endif /* OPENSSL_NO_ENGINE */
968
969
tls_engine_init(struct tls_connection * conn,const char * engine_id,const char * pin,const char * key_id,const char * cert_id,const char * ca_cert_id)970 static int tls_engine_init(struct tls_connection *conn, const char *engine_id,
971 const char *pin, const char *key_id,
972 const char *cert_id, const char *ca_cert_id)
973 {
974 #ifndef OPENSSL_NO_ENGINE
975 int ret = -1;
976 if (engine_id == NULL) {
977 wpa_printf(MSG_ERROR, "ENGINE: Engine ID not set");
978 return -1;
979 }
980
981 ERR_clear_error();
982 #ifdef ANDROID
983 ENGINE_load_dynamic();
984 #endif
985 conn->engine = ENGINE_by_id(engine_id);
986 if (!conn->engine) {
987 wpa_printf(MSG_ERROR, "ENGINE: engine %s not available [%s]",
988 engine_id, ERR_error_string(ERR_get_error(), NULL));
989 goto err;
990 }
991 if (ENGINE_init(conn->engine) != 1) {
992 wpa_printf(MSG_ERROR, "ENGINE: engine init failed "
993 "(engine: %s) [%s]", engine_id,
994 ERR_error_string(ERR_get_error(), NULL));
995 goto err;
996 }
997 wpa_printf(MSG_DEBUG, "ENGINE: engine initialized");
998
999 #ifndef ANDROID
1000 if (pin && ENGINE_ctrl_cmd_string(conn->engine, "PIN", pin, 0) == 0) {
1001 wpa_printf(MSG_ERROR, "ENGINE: cannot set pin [%s]",
1002 ERR_error_string(ERR_get_error(), NULL));
1003 goto err;
1004 }
1005 #endif
1006 if (key_id) {
1007 /*
1008 * Ensure that the ENGINE does not attempt to use the OpenSSL
1009 * UI system to obtain a PIN, if we didn't provide one.
1010 */
1011 struct {
1012 const void *password;
1013 const char *prompt_info;
1014 } key_cb = { "", NULL };
1015
1016 /* load private key first in-case PIN is required for cert */
1017 conn->private_key = ENGINE_load_private_key(conn->engine,
1018 key_id, NULL,
1019 &key_cb);
1020 if (!conn->private_key) {
1021 unsigned long err = ERR_get_error();
1022
1023 wpa_printf(MSG_ERROR,
1024 "ENGINE: cannot load private key with id '%s' [%s]",
1025 key_id,
1026 ERR_error_string(err, NULL));
1027 if (tls_is_pin_error(err))
1028 ret = TLS_SET_PARAMS_ENGINE_PRV_BAD_PIN;
1029 else
1030 ret = TLS_SET_PARAMS_ENGINE_PRV_INIT_FAILED;
1031 goto err;
1032 }
1033 }
1034
1035 /* handle a certificate and/or CA certificate */
1036 if (cert_id || ca_cert_id) {
1037 const char *cmd_name = "LOAD_CERT_CTRL";
1038
1039 /* test if the engine supports a LOAD_CERT_CTRL */
1040 if (!ENGINE_ctrl(conn->engine, ENGINE_CTRL_GET_CMD_FROM_NAME,
1041 0, (void *)cmd_name, NULL)) {
1042 wpa_printf(MSG_ERROR, "ENGINE: engine does not support"
1043 " loading certificates");
1044 ret = TLS_SET_PARAMS_ENGINE_PRV_INIT_FAILED;
1045 goto err;
1046 }
1047 }
1048
1049 return 0;
1050
1051 err:
1052 if (conn->engine) {
1053 ENGINE_free(conn->engine);
1054 conn->engine = NULL;
1055 }
1056
1057 if (conn->private_key) {
1058 EVP_PKEY_free(conn->private_key);
1059 conn->private_key = NULL;
1060 }
1061
1062 return ret;
1063 #else /* OPENSSL_NO_ENGINE */
1064 return 0;
1065 #endif /* OPENSSL_NO_ENGINE */
1066 }
1067
1068
tls_engine_deinit(struct tls_connection * conn)1069 static void tls_engine_deinit(struct tls_connection *conn)
1070 {
1071 #ifndef OPENSSL_NO_ENGINE
1072 wpa_printf(MSG_DEBUG, "ENGINE: engine deinit");
1073 if (conn->private_key) {
1074 EVP_PKEY_free(conn->private_key);
1075 conn->private_key = NULL;
1076 }
1077 if (conn->engine) {
1078 ENGINE_finish(conn->engine);
1079 conn->engine = NULL;
1080 }
1081 #endif /* OPENSSL_NO_ENGINE */
1082 }
1083
1084
tls_get_errors(void * ssl_ctx)1085 int tls_get_errors(void *ssl_ctx)
1086 {
1087 int count = 0;
1088 unsigned long err;
1089
1090 while ((err = ERR_get_error())) {
1091 wpa_printf(MSG_INFO, "TLS - SSL error: %s",
1092 ERR_error_string(err, NULL));
1093 count++;
1094 }
1095
1096 return count;
1097 }
1098
1099
tls_msg_cb(int write_p,int version,int content_type,const void * buf,size_t len,SSL * ssl,void * arg)1100 static void tls_msg_cb(int write_p, int version, int content_type,
1101 const void *buf, size_t len, SSL *ssl, void *arg)
1102 {
1103 struct tls_connection *conn = arg;
1104 const u8 *pos = buf;
1105
1106 wpa_printf(MSG_DEBUG, "OpenSSL: %s ver=0x%x content_type=%d",
1107 write_p ? "TX" : "RX", version, content_type);
1108 wpa_hexdump_key(MSG_MSGDUMP, "OpenSSL: Message", buf, len);
1109 if (content_type == 24 && len >= 3 && pos[0] == 1) {
1110 size_t payload_len = WPA_GET_BE16(pos + 1);
1111 if (payload_len + 3 > len) {
1112 wpa_printf(MSG_ERROR, "OpenSSL: Heartbeat attack detected");
1113 conn->invalid_hb_used = 1;
1114 }
1115 }
1116 }
1117
1118
tls_connection_init(void * ssl_ctx)1119 struct tls_connection * tls_connection_init(void *ssl_ctx)
1120 {
1121 struct tls_data *data = ssl_ctx;
1122 SSL_CTX *ssl = data->ssl;
1123 struct tls_connection *conn;
1124 long options;
1125 struct tls_context *context = SSL_CTX_get_app_data(ssl);
1126
1127 conn = os_zalloc(sizeof(*conn));
1128 if (conn == NULL)
1129 return NULL;
1130 conn->ssl_ctx = ssl;
1131 conn->ssl = SSL_new(ssl);
1132 if (conn->ssl == NULL) {
1133 tls_show_errors(MSG_INFO, __func__,
1134 "Failed to initialize new SSL connection");
1135 os_free(conn);
1136 return NULL;
1137 }
1138
1139 conn->context = context;
1140 SSL_set_app_data(conn->ssl, conn);
1141 SSL_set_msg_callback(conn->ssl, tls_msg_cb);
1142 SSL_set_msg_callback_arg(conn->ssl, conn);
1143 options = SSL_OP_NO_SSLv2 | SSL_OP_NO_SSLv3 |
1144 SSL_OP_SINGLE_DH_USE;
1145 #ifdef SSL_OP_NO_COMPRESSION
1146 options |= SSL_OP_NO_COMPRESSION;
1147 #endif /* SSL_OP_NO_COMPRESSION */
1148 SSL_set_options(conn->ssl, options);
1149
1150 conn->ssl_in = BIO_new(BIO_s_mem());
1151 if (!conn->ssl_in) {
1152 tls_show_errors(MSG_INFO, __func__,
1153 "Failed to create a new BIO for ssl_in");
1154 SSL_free(conn->ssl);
1155 os_free(conn);
1156 return NULL;
1157 }
1158
1159 conn->ssl_out = BIO_new(BIO_s_mem());
1160 if (!conn->ssl_out) {
1161 tls_show_errors(MSG_INFO, __func__,
1162 "Failed to create a new BIO for ssl_out");
1163 SSL_free(conn->ssl);
1164 BIO_free(conn->ssl_in);
1165 os_free(conn);
1166 return NULL;
1167 }
1168
1169 SSL_set_bio(conn->ssl, conn->ssl_in, conn->ssl_out);
1170
1171 return conn;
1172 }
1173
1174
tls_connection_deinit(void * ssl_ctx,struct tls_connection * conn)1175 void tls_connection_deinit(void *ssl_ctx, struct tls_connection *conn)
1176 {
1177 if (conn == NULL)
1178 return;
1179 if (conn->success_data) {
1180 /*
1181 * Make sure ssl_clear_bad_session() does not remove this
1182 * session.
1183 */
1184 SSL_set_quiet_shutdown(conn->ssl, 1);
1185 SSL_shutdown(conn->ssl);
1186 }
1187 SSL_free(conn->ssl);
1188 tls_engine_deinit(conn);
1189 os_free(conn->subject_match);
1190 os_free(conn->altsubject_match);
1191 os_free(conn->suffix_match);
1192 os_free(conn->domain_match);
1193 os_free(conn->session_ticket);
1194 os_free(conn);
1195 }
1196
1197
tls_connection_established(void * ssl_ctx,struct tls_connection * conn)1198 int tls_connection_established(void *ssl_ctx, struct tls_connection *conn)
1199 {
1200 return conn ? SSL_is_init_finished(conn->ssl) : 0;
1201 }
1202
1203
tls_connection_shutdown(void * ssl_ctx,struct tls_connection * conn)1204 int tls_connection_shutdown(void *ssl_ctx, struct tls_connection *conn)
1205 {
1206 if (conn == NULL)
1207 return -1;
1208
1209 /* Shutdown previous TLS connection without notifying the peer
1210 * because the connection was already terminated in practice
1211 * and "close notify" shutdown alert would confuse AS. */
1212 SSL_set_quiet_shutdown(conn->ssl, 1);
1213 SSL_shutdown(conn->ssl);
1214 return SSL_clear(conn->ssl) == 1 ? 0 : -1;
1215 }
1216
1217
tls_match_altsubject_component(X509 * cert,int type,const char * value,size_t len)1218 static int tls_match_altsubject_component(X509 *cert, int type,
1219 const char *value, size_t len)
1220 {
1221 GENERAL_NAME *gen;
1222 void *ext;
1223 int found = 0;
1224 stack_index_t i;
1225
1226 ext = X509_get_ext_d2i(cert, NID_subject_alt_name, NULL, NULL);
1227
1228 for (i = 0; ext && i < sk_GENERAL_NAME_num(ext); i++) {
1229 gen = sk_GENERAL_NAME_value(ext, i);
1230 if (gen->type != type)
1231 continue;
1232 if (os_strlen((char *) gen->d.ia5->data) == len &&
1233 os_memcmp(value, gen->d.ia5->data, len) == 0)
1234 found++;
1235 }
1236
1237 return found;
1238 }
1239
1240
tls_match_altsubject(X509 * cert,const char * match)1241 static int tls_match_altsubject(X509 *cert, const char *match)
1242 {
1243 int type;
1244 const char *pos, *end;
1245 size_t len;
1246
1247 pos = match;
1248 do {
1249 if (os_strncmp(pos, "EMAIL:", 6) == 0) {
1250 type = GEN_EMAIL;
1251 pos += 6;
1252 } else if (os_strncmp(pos, "DNS:", 4) == 0) {
1253 type = GEN_DNS;
1254 pos += 4;
1255 } else if (os_strncmp(pos, "URI:", 4) == 0) {
1256 type = GEN_URI;
1257 pos += 4;
1258 } else {
1259 wpa_printf(MSG_INFO, "TLS: Invalid altSubjectName "
1260 "match '%s'", pos);
1261 return 0;
1262 }
1263 end = os_strchr(pos, ';');
1264 while (end) {
1265 if (os_strncmp(end + 1, "EMAIL:", 6) == 0 ||
1266 os_strncmp(end + 1, "DNS:", 4) == 0 ||
1267 os_strncmp(end + 1, "URI:", 4) == 0)
1268 break;
1269 end = os_strchr(end + 1, ';');
1270 }
1271 if (end)
1272 len = end - pos;
1273 else
1274 len = os_strlen(pos);
1275 if (tls_match_altsubject_component(cert, type, pos, len) > 0)
1276 return 1;
1277 pos = end + 1;
1278 } while (end);
1279
1280 return 0;
1281 }
1282
1283
1284 #ifndef CONFIG_NATIVE_WINDOWS
domain_suffix_match(const u8 * val,size_t len,const char * match,int full)1285 static int domain_suffix_match(const u8 *val, size_t len, const char *match,
1286 int full)
1287 {
1288 size_t i, match_len;
1289
1290 /* Check for embedded nuls that could mess up suffix matching */
1291 for (i = 0; i < len; i++) {
1292 if (val[i] == '\0') {
1293 wpa_printf(MSG_DEBUG, "TLS: Embedded null in a string - reject");
1294 return 0;
1295 }
1296 }
1297
1298 match_len = os_strlen(match);
1299 if (match_len > len || (full && match_len != len))
1300 return 0;
1301
1302 if (os_strncasecmp((const char *) val + len - match_len, match,
1303 match_len) != 0)
1304 return 0; /* no match */
1305
1306 if (match_len == len)
1307 return 1; /* exact match */
1308
1309 if (val[len - match_len - 1] == '.')
1310 return 1; /* full label match completes suffix match */
1311
1312 wpa_printf(MSG_DEBUG, "TLS: Reject due to incomplete label match");
1313 return 0;
1314 }
1315 #endif /* CONFIG_NATIVE_WINDOWS */
1316
1317
tls_match_suffix(X509 * cert,const char * match,int full)1318 static int tls_match_suffix(X509 *cert, const char *match, int full)
1319 {
1320 #ifdef CONFIG_NATIVE_WINDOWS
1321 /* wincrypt.h has conflicting X509_NAME definition */
1322 return -1;
1323 #else /* CONFIG_NATIVE_WINDOWS */
1324 GENERAL_NAME *gen;
1325 void *ext;
1326 int i;
1327 stack_index_t j;
1328 int dns_name = 0;
1329 X509_NAME *name;
1330
1331 wpa_printf(MSG_DEBUG, "TLS: Match domain against %s%s",
1332 full ? "": "suffix ", match);
1333
1334 ext = X509_get_ext_d2i(cert, NID_subject_alt_name, NULL, NULL);
1335
1336 for (j = 0; ext && j < sk_GENERAL_NAME_num(ext); j++) {
1337 gen = sk_GENERAL_NAME_value(ext, j);
1338 if (gen->type != GEN_DNS)
1339 continue;
1340 dns_name++;
1341 wpa_hexdump_ascii(MSG_DEBUG, "TLS: Certificate dNSName",
1342 gen->d.dNSName->data,
1343 gen->d.dNSName->length);
1344 if (domain_suffix_match(gen->d.dNSName->data,
1345 gen->d.dNSName->length, match, full) ==
1346 1) {
1347 wpa_printf(MSG_DEBUG, "TLS: %s in dNSName found",
1348 full ? "Match" : "Suffix match");
1349 return 1;
1350 }
1351 }
1352
1353 if (dns_name) {
1354 wpa_printf(MSG_DEBUG, "TLS: None of the dNSName(s) matched");
1355 return 0;
1356 }
1357
1358 name = X509_get_subject_name(cert);
1359 i = -1;
1360 for (;;) {
1361 X509_NAME_ENTRY *e;
1362 ASN1_STRING *cn;
1363
1364 i = X509_NAME_get_index_by_NID(name, NID_commonName, i);
1365 if (i == -1)
1366 break;
1367 e = X509_NAME_get_entry(name, i);
1368 if (e == NULL)
1369 continue;
1370 cn = X509_NAME_ENTRY_get_data(e);
1371 if (cn == NULL)
1372 continue;
1373 wpa_hexdump_ascii(MSG_DEBUG, "TLS: Certificate commonName",
1374 cn->data, cn->length);
1375 if (domain_suffix_match(cn->data, cn->length, match, full) == 1)
1376 {
1377 wpa_printf(MSG_DEBUG, "TLS: %s in commonName found",
1378 full ? "Match" : "Suffix match");
1379 return 1;
1380 }
1381 }
1382
1383 wpa_printf(MSG_DEBUG, "TLS: No CommonName %smatch found",
1384 full ? "": "suffix ");
1385 return 0;
1386 #endif /* CONFIG_NATIVE_WINDOWS */
1387 }
1388
1389
openssl_tls_fail_reason(int err)1390 static enum tls_fail_reason openssl_tls_fail_reason(int err)
1391 {
1392 switch (err) {
1393 case X509_V_ERR_CERT_REVOKED:
1394 return TLS_FAIL_REVOKED;
1395 case X509_V_ERR_CERT_NOT_YET_VALID:
1396 case X509_V_ERR_CRL_NOT_YET_VALID:
1397 return TLS_FAIL_NOT_YET_VALID;
1398 case X509_V_ERR_CERT_HAS_EXPIRED:
1399 case X509_V_ERR_CRL_HAS_EXPIRED:
1400 return TLS_FAIL_EXPIRED;
1401 case X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT:
1402 case X509_V_ERR_UNABLE_TO_GET_CRL:
1403 case X509_V_ERR_UNABLE_TO_GET_CRL_ISSUER:
1404 case X509_V_ERR_SELF_SIGNED_CERT_IN_CHAIN:
1405 case X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT_LOCALLY:
1406 case X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT:
1407 case X509_V_ERR_UNABLE_TO_VERIFY_LEAF_SIGNATURE:
1408 case X509_V_ERR_CERT_CHAIN_TOO_LONG:
1409 case X509_V_ERR_PATH_LENGTH_EXCEEDED:
1410 case X509_V_ERR_INVALID_CA:
1411 return TLS_FAIL_UNTRUSTED;
1412 case X509_V_ERR_UNABLE_TO_DECRYPT_CERT_SIGNATURE:
1413 case X509_V_ERR_UNABLE_TO_DECRYPT_CRL_SIGNATURE:
1414 case X509_V_ERR_UNABLE_TO_DECODE_ISSUER_PUBLIC_KEY:
1415 case X509_V_ERR_ERROR_IN_CERT_NOT_BEFORE_FIELD:
1416 case X509_V_ERR_ERROR_IN_CERT_NOT_AFTER_FIELD:
1417 case X509_V_ERR_ERROR_IN_CRL_LAST_UPDATE_FIELD:
1418 case X509_V_ERR_ERROR_IN_CRL_NEXT_UPDATE_FIELD:
1419 case X509_V_ERR_CERT_UNTRUSTED:
1420 case X509_V_ERR_CERT_REJECTED:
1421 return TLS_FAIL_BAD_CERTIFICATE;
1422 default:
1423 return TLS_FAIL_UNSPECIFIED;
1424 }
1425 }
1426
1427
get_x509_cert(X509 * cert)1428 static struct wpabuf * get_x509_cert(X509 *cert)
1429 {
1430 struct wpabuf *buf;
1431 u8 *tmp;
1432
1433 int cert_len = i2d_X509(cert, NULL);
1434 if (cert_len <= 0)
1435 return NULL;
1436
1437 buf = wpabuf_alloc(cert_len);
1438 if (buf == NULL)
1439 return NULL;
1440
1441 tmp = wpabuf_put(buf, cert_len);
1442 i2d_X509(cert, &tmp);
1443 return buf;
1444 }
1445
1446
openssl_tls_fail_event(struct tls_connection * conn,X509 * err_cert,int err,int depth,const char * subject,const char * err_str,enum tls_fail_reason reason)1447 static void openssl_tls_fail_event(struct tls_connection *conn,
1448 X509 *err_cert, int err, int depth,
1449 const char *subject, const char *err_str,
1450 enum tls_fail_reason reason)
1451 {
1452 union tls_event_data ev;
1453 struct wpabuf *cert = NULL;
1454 struct tls_context *context = conn->context;
1455
1456 if (context->event_cb == NULL)
1457 return;
1458
1459 cert = get_x509_cert(err_cert);
1460 os_memset(&ev, 0, sizeof(ev));
1461 ev.cert_fail.reason = reason != TLS_FAIL_UNSPECIFIED ?
1462 reason : openssl_tls_fail_reason(err);
1463 ev.cert_fail.depth = depth;
1464 ev.cert_fail.subject = subject;
1465 ev.cert_fail.reason_txt = err_str;
1466 ev.cert_fail.cert = cert;
1467 context->event_cb(context->cb_ctx, TLS_CERT_CHAIN_FAILURE, &ev);
1468 wpabuf_free(cert);
1469 }
1470
1471
openssl_tls_cert_event(struct tls_connection * conn,X509 * err_cert,int depth,const char * subject)1472 static void openssl_tls_cert_event(struct tls_connection *conn,
1473 X509 *err_cert, int depth,
1474 const char *subject)
1475 {
1476 struct wpabuf *cert = NULL;
1477 union tls_event_data ev;
1478 struct tls_context *context = conn->context;
1479 char *altsubject[TLS_MAX_ALT_SUBJECT];
1480 int alt, num_altsubject = 0;
1481 GENERAL_NAME *gen;
1482 void *ext;
1483 stack_index_t i;
1484 #ifdef CONFIG_SHA256
1485 u8 hash[32];
1486 #endif /* CONFIG_SHA256 */
1487
1488 if (context->event_cb == NULL)
1489 return;
1490
1491 os_memset(&ev, 0, sizeof(ev));
1492 if (conn->cert_probe || context->cert_in_cb) {
1493 cert = get_x509_cert(err_cert);
1494 ev.peer_cert.cert = cert;
1495 }
1496 #ifdef CONFIG_SHA256
1497 if (cert) {
1498 const u8 *addr[1];
1499 size_t len[1];
1500 addr[0] = wpabuf_head(cert);
1501 len[0] = wpabuf_len(cert);
1502 if (sha256_vector(1, addr, len, hash) == 0) {
1503 ev.peer_cert.hash = hash;
1504 ev.peer_cert.hash_len = sizeof(hash);
1505 }
1506 }
1507 #endif /* CONFIG_SHA256 */
1508 ev.peer_cert.depth = depth;
1509 ev.peer_cert.subject = subject;
1510
1511 ext = X509_get_ext_d2i(err_cert, NID_subject_alt_name, NULL, NULL);
1512 for (i = 0; ext && i < sk_GENERAL_NAME_num(ext); i++) {
1513 char *pos;
1514
1515 if (num_altsubject == TLS_MAX_ALT_SUBJECT)
1516 break;
1517 gen = sk_GENERAL_NAME_value(ext, i);
1518 if (gen->type != GEN_EMAIL &&
1519 gen->type != GEN_DNS &&
1520 gen->type != GEN_URI)
1521 continue;
1522
1523 pos = os_malloc(10 + gen->d.ia5->length + 1);
1524 if (pos == NULL)
1525 break;
1526 altsubject[num_altsubject++] = pos;
1527
1528 switch (gen->type) {
1529 case GEN_EMAIL:
1530 os_memcpy(pos, "EMAIL:", 6);
1531 pos += 6;
1532 break;
1533 case GEN_DNS:
1534 os_memcpy(pos, "DNS:", 4);
1535 pos += 4;
1536 break;
1537 case GEN_URI:
1538 os_memcpy(pos, "URI:", 4);
1539 pos += 4;
1540 break;
1541 }
1542
1543 os_memcpy(pos, gen->d.ia5->data, gen->d.ia5->length);
1544 pos += gen->d.ia5->length;
1545 *pos = '\0';
1546 }
1547
1548 for (alt = 0; alt < num_altsubject; alt++)
1549 ev.peer_cert.altsubject[alt] = altsubject[alt];
1550 ev.peer_cert.num_altsubject = num_altsubject;
1551
1552 context->event_cb(context->cb_ctx, TLS_PEER_CERTIFICATE, &ev);
1553 wpabuf_free(cert);
1554 for (alt = 0; alt < num_altsubject; alt++)
1555 os_free(altsubject[alt]);
1556 }
1557
1558
tls_verify_cb(int preverify_ok,X509_STORE_CTX * x509_ctx)1559 static int tls_verify_cb(int preverify_ok, X509_STORE_CTX *x509_ctx)
1560 {
1561 char buf[256];
1562 X509 *err_cert;
1563 int err, depth;
1564 SSL *ssl;
1565 struct tls_connection *conn;
1566 struct tls_context *context;
1567 char *match, *altmatch, *suffix_match, *domain_match;
1568 const char *err_str;
1569
1570 err_cert = X509_STORE_CTX_get_current_cert(x509_ctx);
1571 if (!err_cert)
1572 return 0;
1573
1574 err = X509_STORE_CTX_get_error(x509_ctx);
1575 depth = X509_STORE_CTX_get_error_depth(x509_ctx);
1576 ssl = X509_STORE_CTX_get_ex_data(x509_ctx,
1577 SSL_get_ex_data_X509_STORE_CTX_idx());
1578 X509_NAME_oneline(X509_get_subject_name(err_cert), buf, sizeof(buf));
1579
1580 conn = SSL_get_app_data(ssl);
1581 if (conn == NULL)
1582 return 0;
1583
1584 if (depth == 0)
1585 conn->peer_cert = err_cert;
1586 else if (depth == 1)
1587 conn->peer_issuer = err_cert;
1588 else if (depth == 2)
1589 conn->peer_issuer_issuer = err_cert;
1590
1591 context = conn->context;
1592 match = conn->subject_match;
1593 altmatch = conn->altsubject_match;
1594 suffix_match = conn->suffix_match;
1595 domain_match = conn->domain_match;
1596
1597 if (!preverify_ok && !conn->ca_cert_verify)
1598 preverify_ok = 1;
1599 if (!preverify_ok && depth > 0 && conn->server_cert_only)
1600 preverify_ok = 1;
1601 if (!preverify_ok && (conn->flags & TLS_CONN_DISABLE_TIME_CHECKS) &&
1602 (err == X509_V_ERR_CERT_HAS_EXPIRED ||
1603 err == X509_V_ERR_CERT_NOT_YET_VALID)) {
1604 wpa_printf(MSG_DEBUG, "OpenSSL: Ignore certificate validity "
1605 "time mismatch");
1606 preverify_ok = 1;
1607 }
1608
1609 err_str = X509_verify_cert_error_string(err);
1610
1611 #ifdef CONFIG_SHA256
1612 /*
1613 * Do not require preverify_ok so we can explicity allow otherwise
1614 * invalid pinned server certificates.
1615 */
1616 if (depth == 0 && conn->server_cert_only) {
1617 struct wpabuf *cert;
1618 cert = get_x509_cert(err_cert);
1619 if (!cert) {
1620 wpa_printf(MSG_DEBUG, "OpenSSL: Could not fetch "
1621 "server certificate data");
1622 preverify_ok = 0;
1623 } else {
1624 u8 hash[32];
1625 const u8 *addr[1];
1626 size_t len[1];
1627 addr[0] = wpabuf_head(cert);
1628 len[0] = wpabuf_len(cert);
1629 if (sha256_vector(1, addr, len, hash) < 0 ||
1630 os_memcmp(conn->srv_cert_hash, hash, 32) != 0) {
1631 err_str = "Server certificate mismatch";
1632 err = X509_V_ERR_SELF_SIGNED_CERT_IN_CHAIN;
1633 preverify_ok = 0;
1634 } else if (!preverify_ok) {
1635 /*
1636 * Certificate matches pinned certificate, allow
1637 * regardless of other problems.
1638 */
1639 wpa_printf(MSG_DEBUG,
1640 "OpenSSL: Ignore validation issues for a pinned server certificate");
1641 preverify_ok = 1;
1642 }
1643 wpabuf_free(cert);
1644 }
1645 }
1646 #endif /* CONFIG_SHA256 */
1647
1648 if (!preverify_ok) {
1649 wpa_printf(MSG_WARNING, "TLS: Certificate verification failed,"
1650 " error %d (%s) depth %d for '%s'", err, err_str,
1651 depth, buf);
1652 openssl_tls_fail_event(conn, err_cert, err, depth, buf,
1653 err_str, TLS_FAIL_UNSPECIFIED);
1654 return preverify_ok;
1655 }
1656
1657 wpa_printf(MSG_DEBUG, "TLS: tls_verify_cb - preverify_ok=%d "
1658 "err=%d (%s) ca_cert_verify=%d depth=%d buf='%s'",
1659 preverify_ok, err, err_str,
1660 conn->ca_cert_verify, depth, buf);
1661 if (depth == 0 && match && os_strstr(buf, match) == NULL) {
1662 wpa_printf(MSG_WARNING, "TLS: Subject '%s' did not "
1663 "match with '%s'", buf, match);
1664 preverify_ok = 0;
1665 openssl_tls_fail_event(conn, err_cert, err, depth, buf,
1666 "Subject mismatch",
1667 TLS_FAIL_SUBJECT_MISMATCH);
1668 } else if (depth == 0 && altmatch &&
1669 !tls_match_altsubject(err_cert, altmatch)) {
1670 wpa_printf(MSG_WARNING, "TLS: altSubjectName match "
1671 "'%s' not found", altmatch);
1672 preverify_ok = 0;
1673 openssl_tls_fail_event(conn, err_cert, err, depth, buf,
1674 "AltSubject mismatch",
1675 TLS_FAIL_ALTSUBJECT_MISMATCH);
1676 } else if (depth == 0 && suffix_match &&
1677 !tls_match_suffix(err_cert, suffix_match, 0)) {
1678 wpa_printf(MSG_WARNING, "TLS: Domain suffix match '%s' not found",
1679 suffix_match);
1680 preverify_ok = 0;
1681 openssl_tls_fail_event(conn, err_cert, err, depth, buf,
1682 "Domain suffix mismatch",
1683 TLS_FAIL_DOMAIN_SUFFIX_MISMATCH);
1684 } else if (depth == 0 && domain_match &&
1685 !tls_match_suffix(err_cert, domain_match, 1)) {
1686 wpa_printf(MSG_WARNING, "TLS: Domain match '%s' not found",
1687 domain_match);
1688 preverify_ok = 0;
1689 openssl_tls_fail_event(conn, err_cert, err, depth, buf,
1690 "Domain mismatch",
1691 TLS_FAIL_DOMAIN_MISMATCH);
1692 } else
1693 openssl_tls_cert_event(conn, err_cert, depth, buf);
1694
1695 if (conn->cert_probe && preverify_ok && depth == 0) {
1696 wpa_printf(MSG_DEBUG, "OpenSSL: Reject server certificate "
1697 "on probe-only run");
1698 preverify_ok = 0;
1699 openssl_tls_fail_event(conn, err_cert, err, depth, buf,
1700 "Server certificate chain probe",
1701 TLS_FAIL_SERVER_CHAIN_PROBE);
1702 }
1703
1704 if (preverify_ok && context->event_cb != NULL)
1705 context->event_cb(context->cb_ctx,
1706 TLS_CERT_CHAIN_SUCCESS, NULL);
1707
1708 return preverify_ok;
1709 }
1710
1711
1712 #ifndef OPENSSL_NO_STDIO
tls_load_ca_der(struct tls_data * data,const char * ca_cert)1713 static int tls_load_ca_der(struct tls_data *data, const char *ca_cert)
1714 {
1715 SSL_CTX *ssl_ctx = data->ssl;
1716 X509_LOOKUP *lookup;
1717 int ret = 0;
1718
1719 lookup = X509_STORE_add_lookup(SSL_CTX_get_cert_store(ssl_ctx),
1720 X509_LOOKUP_file());
1721 if (lookup == NULL) {
1722 tls_show_errors(MSG_WARNING, __func__,
1723 "Failed add lookup for X509 store");
1724 return -1;
1725 }
1726
1727 if (!X509_LOOKUP_load_file(lookup, ca_cert, X509_FILETYPE_ASN1)) {
1728 unsigned long err = ERR_peek_error();
1729 tls_show_errors(MSG_WARNING, __func__,
1730 "Failed load CA in DER format");
1731 if (ERR_GET_LIB(err) == ERR_LIB_X509 &&
1732 ERR_GET_REASON(err) == X509_R_CERT_ALREADY_IN_HASH_TABLE) {
1733 wpa_printf(MSG_DEBUG, "OpenSSL: %s - ignoring "
1734 "cert already in hash table error",
1735 __func__);
1736 } else
1737 ret = -1;
1738 }
1739
1740 return ret;
1741 }
1742 #endif /* OPENSSL_NO_STDIO */
1743
1744
tls_connection_ca_cert(struct tls_data * data,struct tls_connection * conn,const char * ca_cert,const u8 * ca_cert_blob,size_t ca_cert_blob_len,const char * ca_path)1745 static int tls_connection_ca_cert(struct tls_data *data,
1746 struct tls_connection *conn,
1747 const char *ca_cert, const u8 *ca_cert_blob,
1748 size_t ca_cert_blob_len, const char *ca_path)
1749 {
1750 SSL_CTX *ssl_ctx = data->ssl;
1751 X509_STORE *store;
1752
1753 /*
1754 * Remove previously configured trusted CA certificates before adding
1755 * new ones.
1756 */
1757 store = X509_STORE_new();
1758 if (store == NULL) {
1759 wpa_printf(MSG_DEBUG, "OpenSSL: %s - failed to allocate new "
1760 "certificate store", __func__);
1761 return -1;
1762 }
1763 SSL_CTX_set_cert_store(ssl_ctx, store);
1764
1765 SSL_set_verify(conn->ssl, SSL_VERIFY_PEER, tls_verify_cb);
1766 conn->ca_cert_verify = 1;
1767
1768 if (ca_cert && os_strncmp(ca_cert, "probe://", 8) == 0) {
1769 wpa_printf(MSG_DEBUG, "OpenSSL: Probe for server certificate "
1770 "chain");
1771 conn->cert_probe = 1;
1772 conn->ca_cert_verify = 0;
1773 return 0;
1774 }
1775
1776 if (ca_cert && os_strncmp(ca_cert, "hash://", 7) == 0) {
1777 #ifdef CONFIG_SHA256
1778 const char *pos = ca_cert + 7;
1779 if (os_strncmp(pos, "server/sha256/", 14) != 0) {
1780 wpa_printf(MSG_DEBUG, "OpenSSL: Unsupported ca_cert "
1781 "hash value '%s'", ca_cert);
1782 return -1;
1783 }
1784 pos += 14;
1785 if (os_strlen(pos) != 32 * 2) {
1786 wpa_printf(MSG_DEBUG, "OpenSSL: Unexpected SHA256 "
1787 "hash length in ca_cert '%s'", ca_cert);
1788 return -1;
1789 }
1790 if (hexstr2bin(pos, conn->srv_cert_hash, 32) < 0) {
1791 wpa_printf(MSG_DEBUG, "OpenSSL: Invalid SHA256 hash "
1792 "value in ca_cert '%s'", ca_cert);
1793 return -1;
1794 }
1795 conn->server_cert_only = 1;
1796 wpa_printf(MSG_DEBUG, "OpenSSL: Checking only server "
1797 "certificate match");
1798 return 0;
1799 #else /* CONFIG_SHA256 */
1800 wpa_printf(MSG_INFO, "No SHA256 included in the build - "
1801 "cannot validate server certificate hash");
1802 return -1;
1803 #endif /* CONFIG_SHA256 */
1804 }
1805
1806 if (ca_cert_blob) {
1807 X509 *cert = d2i_X509(NULL,
1808 (const unsigned char **) &ca_cert_blob,
1809 ca_cert_blob_len);
1810 if (cert == NULL) {
1811 tls_show_errors(MSG_WARNING, __func__,
1812 "Failed to parse ca_cert_blob");
1813 return -1;
1814 }
1815
1816 if (!X509_STORE_add_cert(SSL_CTX_get_cert_store(ssl_ctx),
1817 cert)) {
1818 unsigned long err = ERR_peek_error();
1819 tls_show_errors(MSG_WARNING, __func__,
1820 "Failed to add ca_cert_blob to "
1821 "certificate store");
1822 if (ERR_GET_LIB(err) == ERR_LIB_X509 &&
1823 ERR_GET_REASON(err) ==
1824 X509_R_CERT_ALREADY_IN_HASH_TABLE) {
1825 wpa_printf(MSG_DEBUG, "OpenSSL: %s - ignoring "
1826 "cert already in hash table error",
1827 __func__);
1828 } else {
1829 X509_free(cert);
1830 return -1;
1831 }
1832 }
1833 X509_free(cert);
1834 wpa_printf(MSG_DEBUG, "OpenSSL: %s - added ca_cert_blob "
1835 "to certificate store", __func__);
1836 return 0;
1837 }
1838
1839 #ifdef ANDROID
1840 if (ca_cert && os_strncmp("keystore://", ca_cert, 11) == 0) {
1841 BIO *bio = BIO_from_keystore(&ca_cert[11]);
1842 STACK_OF(X509_INFO) *stack = NULL;
1843 stack_index_t i;
1844
1845 if (bio) {
1846 stack = PEM_X509_INFO_read_bio(bio, NULL, NULL, NULL);
1847 BIO_free(bio);
1848 }
1849 if (!stack)
1850 return -1;
1851
1852 for (i = 0; i < sk_X509_INFO_num(stack); ++i) {
1853 X509_INFO *info = sk_X509_INFO_value(stack, i);
1854 if (info->x509) {
1855 X509_STORE_add_cert(ssl_ctx->cert_store,
1856 info->x509);
1857 }
1858 if (info->crl) {
1859 X509_STORE_add_crl(ssl_ctx->cert_store,
1860 info->crl);
1861 }
1862 }
1863 sk_X509_INFO_pop_free(stack, X509_INFO_free);
1864 SSL_set_verify(conn->ssl, SSL_VERIFY_PEER, tls_verify_cb);
1865 return 0;
1866 }
1867 #endif /* ANDROID */
1868
1869 #ifdef CONFIG_NATIVE_WINDOWS
1870 if (ca_cert && tls_cryptoapi_ca_cert(ssl_ctx, conn->ssl, ca_cert) ==
1871 0) {
1872 wpa_printf(MSG_DEBUG, "OpenSSL: Added CA certificates from "
1873 "system certificate store");
1874 return 0;
1875 }
1876 #endif /* CONFIG_NATIVE_WINDOWS */
1877
1878 if (ca_cert || ca_path) {
1879 #ifndef OPENSSL_NO_STDIO
1880 if (SSL_CTX_load_verify_locations(ssl_ctx, ca_cert, ca_path) !=
1881 1) {
1882 tls_show_errors(MSG_WARNING, __func__,
1883 "Failed to load root certificates");
1884 if (ca_cert &&
1885 tls_load_ca_der(data, ca_cert) == 0) {
1886 wpa_printf(MSG_DEBUG, "OpenSSL: %s - loaded "
1887 "DER format CA certificate",
1888 __func__);
1889 } else
1890 return -1;
1891 } else {
1892 wpa_printf(MSG_DEBUG, "TLS: Trusted root "
1893 "certificate(s) loaded");
1894 tls_get_errors(data);
1895 }
1896 #else /* OPENSSL_NO_STDIO */
1897 wpa_printf(MSG_DEBUG, "OpenSSL: %s - OPENSSL_NO_STDIO",
1898 __func__);
1899 return -1;
1900 #endif /* OPENSSL_NO_STDIO */
1901 } else {
1902 /* No ca_cert configured - do not try to verify server
1903 * certificate */
1904 conn->ca_cert_verify = 0;
1905 }
1906
1907 return 0;
1908 }
1909
1910
tls_global_ca_cert(struct tls_data * data,const char * ca_cert)1911 static int tls_global_ca_cert(struct tls_data *data, const char *ca_cert)
1912 {
1913 SSL_CTX *ssl_ctx = data->ssl;
1914
1915 if (ca_cert) {
1916 if (SSL_CTX_load_verify_locations(ssl_ctx, ca_cert, NULL) != 1)
1917 {
1918 tls_show_errors(MSG_WARNING, __func__,
1919 "Failed to load root certificates");
1920 return -1;
1921 }
1922
1923 wpa_printf(MSG_DEBUG, "TLS: Trusted root "
1924 "certificate(s) loaded");
1925
1926 #ifndef OPENSSL_NO_STDIO
1927 /* Add the same CAs to the client certificate requests */
1928 SSL_CTX_set_client_CA_list(ssl_ctx,
1929 SSL_load_client_CA_file(ca_cert));
1930 #endif /* OPENSSL_NO_STDIO */
1931 }
1932
1933 return 0;
1934 }
1935
1936
tls_global_set_verify(void * ssl_ctx,int check_crl)1937 int tls_global_set_verify(void *ssl_ctx, int check_crl)
1938 {
1939 int flags;
1940
1941 if (check_crl) {
1942 struct tls_data *data = ssl_ctx;
1943 X509_STORE *cs = SSL_CTX_get_cert_store(data->ssl);
1944 if (cs == NULL) {
1945 tls_show_errors(MSG_INFO, __func__, "Failed to get "
1946 "certificate store when enabling "
1947 "check_crl");
1948 return -1;
1949 }
1950 flags = X509_V_FLAG_CRL_CHECK;
1951 if (check_crl == 2)
1952 flags |= X509_V_FLAG_CRL_CHECK_ALL;
1953 X509_STORE_set_flags(cs, flags);
1954 }
1955 return 0;
1956 }
1957
1958
tls_connection_set_subject_match(struct tls_connection * conn,const char * subject_match,const char * altsubject_match,const char * suffix_match,const char * domain_match)1959 static int tls_connection_set_subject_match(struct tls_connection *conn,
1960 const char *subject_match,
1961 const char *altsubject_match,
1962 const char *suffix_match,
1963 const char *domain_match)
1964 {
1965 os_free(conn->subject_match);
1966 conn->subject_match = NULL;
1967 if (subject_match) {
1968 conn->subject_match = os_strdup(subject_match);
1969 if (conn->subject_match == NULL)
1970 return -1;
1971 }
1972
1973 os_free(conn->altsubject_match);
1974 conn->altsubject_match = NULL;
1975 if (altsubject_match) {
1976 conn->altsubject_match = os_strdup(altsubject_match);
1977 if (conn->altsubject_match == NULL)
1978 return -1;
1979 }
1980
1981 os_free(conn->suffix_match);
1982 conn->suffix_match = NULL;
1983 if (suffix_match) {
1984 conn->suffix_match = os_strdup(suffix_match);
1985 if (conn->suffix_match == NULL)
1986 return -1;
1987 }
1988
1989 os_free(conn->domain_match);
1990 conn->domain_match = NULL;
1991 if (domain_match) {
1992 conn->domain_match = os_strdup(domain_match);
1993 if (conn->domain_match == NULL)
1994 return -1;
1995 }
1996
1997 return 0;
1998 }
1999
2000
tls_set_conn_flags(SSL * ssl,unsigned int flags)2001 static void tls_set_conn_flags(SSL *ssl, unsigned int flags)
2002 {
2003 #ifdef SSL_OP_NO_TICKET
2004 if (flags & TLS_CONN_DISABLE_SESSION_TICKET)
2005 SSL_set_options(ssl, SSL_OP_NO_TICKET);
2006 #ifdef SSL_clear_options
2007 else
2008 SSL_clear_options(ssl, SSL_OP_NO_TICKET);
2009 #endif /* SSL_clear_options */
2010 #endif /* SSL_OP_NO_TICKET */
2011
2012 #ifdef SSL_OP_NO_TLSv1
2013 if (flags & TLS_CONN_DISABLE_TLSv1_0)
2014 SSL_set_options(ssl, SSL_OP_NO_TLSv1);
2015 else
2016 SSL_clear_options(ssl, SSL_OP_NO_TLSv1);
2017 #endif /* SSL_OP_NO_TLSv1 */
2018 #ifdef SSL_OP_NO_TLSv1_1
2019 if (flags & TLS_CONN_DISABLE_TLSv1_1)
2020 SSL_set_options(ssl, SSL_OP_NO_TLSv1_1);
2021 else
2022 SSL_clear_options(ssl, SSL_OP_NO_TLSv1_1);
2023 #endif /* SSL_OP_NO_TLSv1_1 */
2024 #ifdef SSL_OP_NO_TLSv1_2
2025 if (flags & TLS_CONN_DISABLE_TLSv1_2)
2026 SSL_set_options(ssl, SSL_OP_NO_TLSv1_2);
2027 else
2028 SSL_clear_options(ssl, SSL_OP_NO_TLSv1_2);
2029 #endif /* SSL_OP_NO_TLSv1_2 */
2030 }
2031
2032
tls_connection_set_verify(void * ssl_ctx,struct tls_connection * conn,int verify_peer,unsigned int flags,const u8 * session_ctx,size_t session_ctx_len)2033 int tls_connection_set_verify(void *ssl_ctx, struct tls_connection *conn,
2034 int verify_peer, unsigned int flags,
2035 const u8 *session_ctx, size_t session_ctx_len)
2036 {
2037 static int counter = 0;
2038 struct tls_data *data = ssl_ctx;
2039
2040 if (conn == NULL)
2041 return -1;
2042
2043 if (verify_peer) {
2044 conn->ca_cert_verify = 1;
2045 SSL_set_verify(conn->ssl, SSL_VERIFY_PEER |
2046 SSL_VERIFY_FAIL_IF_NO_PEER_CERT |
2047 SSL_VERIFY_CLIENT_ONCE, tls_verify_cb);
2048 } else {
2049 conn->ca_cert_verify = 0;
2050 SSL_set_verify(conn->ssl, SSL_VERIFY_NONE, NULL);
2051 }
2052
2053 tls_set_conn_flags(conn->ssl, flags);
2054 conn->flags = flags;
2055
2056 SSL_set_accept_state(conn->ssl);
2057
2058 if (data->tls_session_lifetime == 0) {
2059 /*
2060 * Set session id context to a unique value to make sure
2061 * session resumption cannot be used either through session
2062 * caching or TLS ticket extension.
2063 */
2064 counter++;
2065 SSL_set_session_id_context(conn->ssl,
2066 (const unsigned char *) &counter,
2067 sizeof(counter));
2068 } else if (session_ctx) {
2069 SSL_set_session_id_context(conn->ssl, session_ctx,
2070 session_ctx_len);
2071 }
2072
2073 return 0;
2074 }
2075
2076
tls_connection_client_cert(struct tls_connection * conn,const char * client_cert,const u8 * client_cert_blob,size_t client_cert_blob_len)2077 static int tls_connection_client_cert(struct tls_connection *conn,
2078 const char *client_cert,
2079 const u8 *client_cert_blob,
2080 size_t client_cert_blob_len)
2081 {
2082 if (client_cert == NULL && client_cert_blob == NULL)
2083 return 0;
2084
2085 if (client_cert_blob &&
2086 SSL_use_certificate_ASN1(conn->ssl, (u8 *) client_cert_blob,
2087 client_cert_blob_len) == 1) {
2088 wpa_printf(MSG_DEBUG, "OpenSSL: SSL_use_certificate_ASN1 --> "
2089 "OK");
2090 return 0;
2091 } else if (client_cert_blob) {
2092 tls_show_errors(MSG_DEBUG, __func__,
2093 "SSL_use_certificate_ASN1 failed");
2094 }
2095
2096 if (client_cert == NULL)
2097 return -1;
2098
2099 #ifdef ANDROID
2100 if (os_strncmp("keystore://", client_cert, 11) == 0) {
2101 BIO *bio = BIO_from_keystore(&client_cert[11]);
2102 X509 *x509 = NULL;
2103 int ret = -1;
2104 if (bio) {
2105 x509 = PEM_read_bio_X509(bio, NULL, NULL, NULL);
2106 BIO_free(bio);
2107 }
2108 if (x509) {
2109 if (SSL_use_certificate(conn->ssl, x509) == 1)
2110 ret = 0;
2111 X509_free(x509);
2112 }
2113 return ret;
2114 }
2115 #endif /* ANDROID */
2116
2117 #ifndef OPENSSL_NO_STDIO
2118 if (SSL_use_certificate_file(conn->ssl, client_cert,
2119 SSL_FILETYPE_ASN1) == 1) {
2120 wpa_printf(MSG_DEBUG, "OpenSSL: SSL_use_certificate_file (DER)"
2121 " --> OK");
2122 return 0;
2123 }
2124
2125 if (SSL_use_certificate_file(conn->ssl, client_cert,
2126 SSL_FILETYPE_PEM) == 1) {
2127 ERR_clear_error();
2128 wpa_printf(MSG_DEBUG, "OpenSSL: SSL_use_certificate_file (PEM)"
2129 " --> OK");
2130 return 0;
2131 }
2132
2133 tls_show_errors(MSG_DEBUG, __func__,
2134 "SSL_use_certificate_file failed");
2135 #else /* OPENSSL_NO_STDIO */
2136 wpa_printf(MSG_DEBUG, "OpenSSL: %s - OPENSSL_NO_STDIO", __func__);
2137 #endif /* OPENSSL_NO_STDIO */
2138
2139 return -1;
2140 }
2141
2142
tls_global_client_cert(struct tls_data * data,const char * client_cert)2143 static int tls_global_client_cert(struct tls_data *data,
2144 const char *client_cert)
2145 {
2146 #ifndef OPENSSL_NO_STDIO
2147 SSL_CTX *ssl_ctx = data->ssl;
2148
2149 if (client_cert == NULL)
2150 return 0;
2151
2152 if (SSL_CTX_use_certificate_file(ssl_ctx, client_cert,
2153 SSL_FILETYPE_ASN1) != 1 &&
2154 SSL_CTX_use_certificate_chain_file(ssl_ctx, client_cert) != 1 &&
2155 SSL_CTX_use_certificate_file(ssl_ctx, client_cert,
2156 SSL_FILETYPE_PEM) != 1) {
2157 tls_show_errors(MSG_INFO, __func__,
2158 "Failed to load client certificate");
2159 return -1;
2160 }
2161 return 0;
2162 #else /* OPENSSL_NO_STDIO */
2163 if (client_cert == NULL)
2164 return 0;
2165 wpa_printf(MSG_DEBUG, "OpenSSL: %s - OPENSSL_NO_STDIO", __func__);
2166 return -1;
2167 #endif /* OPENSSL_NO_STDIO */
2168 }
2169
2170
tls_passwd_cb(char * buf,int size,int rwflag,void * password)2171 static int tls_passwd_cb(char *buf, int size, int rwflag, void *password)
2172 {
2173 if (password == NULL) {
2174 return 0;
2175 }
2176 os_strlcpy(buf, (char *) password, size);
2177 return os_strlen(buf);
2178 }
2179
2180
2181 #ifdef PKCS12_FUNCS
tls_parse_pkcs12(struct tls_data * data,SSL * ssl,PKCS12 * p12,const char * passwd)2182 static int tls_parse_pkcs12(struct tls_data *data, SSL *ssl, PKCS12 *p12,
2183 const char *passwd)
2184 {
2185 EVP_PKEY *pkey;
2186 X509 *cert;
2187 STACK_OF(X509) *certs;
2188 int res = 0;
2189 char buf[256];
2190
2191 pkey = NULL;
2192 cert = NULL;
2193 certs = NULL;
2194 if (!passwd)
2195 passwd = "";
2196 if (!PKCS12_parse(p12, passwd, &pkey, &cert, &certs)) {
2197 tls_show_errors(MSG_DEBUG, __func__,
2198 "Failed to parse PKCS12 file");
2199 PKCS12_free(p12);
2200 return -1;
2201 }
2202 wpa_printf(MSG_DEBUG, "TLS: Successfully parsed PKCS12 data");
2203
2204 if (cert) {
2205 X509_NAME_oneline(X509_get_subject_name(cert), buf,
2206 sizeof(buf));
2207 wpa_printf(MSG_DEBUG, "TLS: Got certificate from PKCS12: "
2208 "subject='%s'", buf);
2209 if (ssl) {
2210 if (SSL_use_certificate(ssl, cert) != 1)
2211 res = -1;
2212 } else {
2213 if (SSL_CTX_use_certificate(data->ssl, cert) != 1)
2214 res = -1;
2215 }
2216 X509_free(cert);
2217 }
2218
2219 if (pkey) {
2220 wpa_printf(MSG_DEBUG, "TLS: Got private key from PKCS12");
2221 if (ssl) {
2222 if (SSL_use_PrivateKey(ssl, pkey) != 1)
2223 res = -1;
2224 } else {
2225 if (SSL_CTX_use_PrivateKey(data->ssl, pkey) != 1)
2226 res = -1;
2227 }
2228 EVP_PKEY_free(pkey);
2229 }
2230
2231 if (certs) {
2232 #if OPENSSL_VERSION_NUMBER >= 0x10002000L
2233 SSL_clear_chain_certs(ssl);
2234 while ((cert = sk_X509_pop(certs)) != NULL) {
2235 X509_NAME_oneline(X509_get_subject_name(cert), buf,
2236 sizeof(buf));
2237 wpa_printf(MSG_DEBUG, "TLS: additional certificate"
2238 " from PKCS12: subject='%s'", buf);
2239 if (SSL_add1_chain_cert(ssl, cert) != 1) {
2240 tls_show_errors(MSG_DEBUG, __func__,
2241 "Failed to add additional certificate");
2242 res = -1;
2243 break;
2244 }
2245 }
2246 if (!res) {
2247 /* Try to continue anyway */
2248 }
2249 sk_X509_free(certs);
2250 #ifndef OPENSSL_IS_BORINGSSL
2251 res = SSL_build_cert_chain(ssl,
2252 SSL_BUILD_CHAIN_FLAG_CHECK |
2253 SSL_BUILD_CHAIN_FLAG_IGNORE_ERROR);
2254 if (!res) {
2255 tls_show_errors(MSG_DEBUG, __func__,
2256 "Failed to build certificate chain");
2257 } else if (res == 2) {
2258 wpa_printf(MSG_DEBUG,
2259 "TLS: Ignore certificate chain verification error when building chain with PKCS#12 extra certificates");
2260 }
2261 #endif /* OPENSSL_IS_BORINGSSL */
2262 /*
2263 * Try to continue regardless of result since it is possible for
2264 * the extra certificates not to be required.
2265 */
2266 res = 0;
2267 #else /* OPENSSL_VERSION_NUMBER >= 0x10002000L */
2268 #if OPENSSL_VERSION_NUMBER >= 0x10001000L
2269 SSL_CTX_clear_extra_chain_certs(data->ssl);
2270 #endif /* OPENSSL_VERSION_NUMBER >= 0x10001000L */
2271 while ((cert = sk_X509_pop(certs)) != NULL) {
2272 X509_NAME_oneline(X509_get_subject_name(cert), buf,
2273 sizeof(buf));
2274 wpa_printf(MSG_DEBUG, "TLS: additional certificate"
2275 " from PKCS12: subject='%s'", buf);
2276 /*
2277 * There is no SSL equivalent for the chain cert - so
2278 * always add it to the context...
2279 */
2280 if (SSL_CTX_add_extra_chain_cert(data->ssl, cert) != 1)
2281 {
2282 res = -1;
2283 break;
2284 }
2285 }
2286 sk_X509_free(certs);
2287 #endif /* OPENSSL_VERSION_NUMBER >= 0x10002000L */
2288 }
2289
2290 PKCS12_free(p12);
2291
2292 if (res < 0)
2293 tls_get_errors(data);
2294
2295 return res;
2296 }
2297 #endif /* PKCS12_FUNCS */
2298
2299
tls_read_pkcs12(struct tls_data * data,SSL * ssl,const char * private_key,const char * passwd)2300 static int tls_read_pkcs12(struct tls_data *data, SSL *ssl,
2301 const char *private_key, const char *passwd)
2302 {
2303 #ifdef PKCS12_FUNCS
2304 FILE *f;
2305 PKCS12 *p12;
2306
2307 f = fopen(private_key, "rb");
2308 if (f == NULL)
2309 return -1;
2310
2311 p12 = d2i_PKCS12_fp(f, NULL);
2312 fclose(f);
2313
2314 if (p12 == NULL) {
2315 tls_show_errors(MSG_INFO, __func__,
2316 "Failed to use PKCS#12 file");
2317 return -1;
2318 }
2319
2320 return tls_parse_pkcs12(data, ssl, p12, passwd);
2321
2322 #else /* PKCS12_FUNCS */
2323 wpa_printf(MSG_INFO, "TLS: PKCS12 support disabled - cannot read "
2324 "p12/pfx files");
2325 return -1;
2326 #endif /* PKCS12_FUNCS */
2327 }
2328
2329
tls_read_pkcs12_blob(struct tls_data * data,SSL * ssl,const u8 * blob,size_t len,const char * passwd)2330 static int tls_read_pkcs12_blob(struct tls_data *data, SSL *ssl,
2331 const u8 *blob, size_t len, const char *passwd)
2332 {
2333 #ifdef PKCS12_FUNCS
2334 PKCS12 *p12;
2335
2336 p12 = d2i_PKCS12(NULL, (const unsigned char **) &blob, len);
2337 if (p12 == NULL) {
2338 tls_show_errors(MSG_INFO, __func__,
2339 "Failed to use PKCS#12 blob");
2340 return -1;
2341 }
2342
2343 return tls_parse_pkcs12(data, ssl, p12, passwd);
2344
2345 #else /* PKCS12_FUNCS */
2346 wpa_printf(MSG_INFO, "TLS: PKCS12 support disabled - cannot parse "
2347 "p12/pfx blobs");
2348 return -1;
2349 #endif /* PKCS12_FUNCS */
2350 }
2351
2352
2353 #ifndef OPENSSL_NO_ENGINE
tls_engine_get_cert(struct tls_connection * conn,const char * cert_id,X509 ** cert)2354 static int tls_engine_get_cert(struct tls_connection *conn,
2355 const char *cert_id,
2356 X509 **cert)
2357 {
2358 /* this runs after the private key is loaded so no PIN is required */
2359 struct {
2360 const char *cert_id;
2361 X509 *cert;
2362 } params;
2363 params.cert_id = cert_id;
2364 params.cert = NULL;
2365
2366 if (!ENGINE_ctrl_cmd(conn->engine, "LOAD_CERT_CTRL",
2367 0, ¶ms, NULL, 1)) {
2368 unsigned long err = ERR_get_error();
2369
2370 wpa_printf(MSG_ERROR, "ENGINE: cannot load client cert with id"
2371 " '%s' [%s]", cert_id,
2372 ERR_error_string(err, NULL));
2373 if (tls_is_pin_error(err))
2374 return TLS_SET_PARAMS_ENGINE_PRV_BAD_PIN;
2375 return TLS_SET_PARAMS_ENGINE_PRV_INIT_FAILED;
2376 }
2377 if (!params.cert) {
2378 wpa_printf(MSG_ERROR, "ENGINE: did not properly cert with id"
2379 " '%s'", cert_id);
2380 return TLS_SET_PARAMS_ENGINE_PRV_INIT_FAILED;
2381 }
2382 *cert = params.cert;
2383 return 0;
2384 }
2385 #endif /* OPENSSL_NO_ENGINE */
2386
2387
tls_connection_engine_client_cert(struct tls_connection * conn,const char * cert_id)2388 static int tls_connection_engine_client_cert(struct tls_connection *conn,
2389 const char *cert_id)
2390 {
2391 #ifndef OPENSSL_NO_ENGINE
2392 X509 *cert;
2393
2394 if (tls_engine_get_cert(conn, cert_id, &cert))
2395 return -1;
2396
2397 if (!SSL_use_certificate(conn->ssl, cert)) {
2398 tls_show_errors(MSG_ERROR, __func__,
2399 "SSL_use_certificate failed");
2400 X509_free(cert);
2401 return -1;
2402 }
2403 X509_free(cert);
2404 wpa_printf(MSG_DEBUG, "ENGINE: SSL_use_certificate --> "
2405 "OK");
2406 return 0;
2407
2408 #else /* OPENSSL_NO_ENGINE */
2409 return -1;
2410 #endif /* OPENSSL_NO_ENGINE */
2411 }
2412
2413
tls_connection_engine_ca_cert(struct tls_data * data,struct tls_connection * conn,const char * ca_cert_id)2414 static int tls_connection_engine_ca_cert(struct tls_data *data,
2415 struct tls_connection *conn,
2416 const char *ca_cert_id)
2417 {
2418 #ifndef OPENSSL_NO_ENGINE
2419 X509 *cert;
2420 SSL_CTX *ssl_ctx = data->ssl;
2421 X509_STORE *store;
2422
2423 if (tls_engine_get_cert(conn, ca_cert_id, &cert))
2424 return -1;
2425
2426 /* start off the same as tls_connection_ca_cert */
2427 store = X509_STORE_new();
2428 if (store == NULL) {
2429 wpa_printf(MSG_DEBUG, "OpenSSL: %s - failed to allocate new "
2430 "certificate store", __func__);
2431 X509_free(cert);
2432 return -1;
2433 }
2434 SSL_CTX_set_cert_store(ssl_ctx, store);
2435 if (!X509_STORE_add_cert(store, cert)) {
2436 unsigned long err = ERR_peek_error();
2437 tls_show_errors(MSG_WARNING, __func__,
2438 "Failed to add CA certificate from engine "
2439 "to certificate store");
2440 if (ERR_GET_LIB(err) == ERR_LIB_X509 &&
2441 ERR_GET_REASON(err) == X509_R_CERT_ALREADY_IN_HASH_TABLE) {
2442 wpa_printf(MSG_DEBUG, "OpenSSL: %s - ignoring cert"
2443 " already in hash table error",
2444 __func__);
2445 } else {
2446 X509_free(cert);
2447 return -1;
2448 }
2449 }
2450 X509_free(cert);
2451 wpa_printf(MSG_DEBUG, "OpenSSL: %s - added CA certificate from engine "
2452 "to certificate store", __func__);
2453 SSL_set_verify(conn->ssl, SSL_VERIFY_PEER, tls_verify_cb);
2454 conn->ca_cert_verify = 1;
2455
2456 return 0;
2457
2458 #else /* OPENSSL_NO_ENGINE */
2459 return -1;
2460 #endif /* OPENSSL_NO_ENGINE */
2461 }
2462
2463
tls_connection_engine_private_key(struct tls_connection * conn)2464 static int tls_connection_engine_private_key(struct tls_connection *conn)
2465 {
2466 #ifndef OPENSSL_NO_ENGINE
2467 if (SSL_use_PrivateKey(conn->ssl, conn->private_key) != 1) {
2468 tls_show_errors(MSG_ERROR, __func__,
2469 "ENGINE: cannot use private key for TLS");
2470 return -1;
2471 }
2472 if (!SSL_check_private_key(conn->ssl)) {
2473 tls_show_errors(MSG_INFO, __func__,
2474 "Private key failed verification");
2475 return -1;
2476 }
2477 return 0;
2478 #else /* OPENSSL_NO_ENGINE */
2479 wpa_printf(MSG_ERROR, "SSL: Configuration uses engine, but "
2480 "engine support was not compiled in");
2481 return -1;
2482 #endif /* OPENSSL_NO_ENGINE */
2483 }
2484
2485
tls_connection_private_key(struct tls_data * data,struct tls_connection * conn,const char * private_key,const char * private_key_passwd,const u8 * private_key_blob,size_t private_key_blob_len)2486 static int tls_connection_private_key(struct tls_data *data,
2487 struct tls_connection *conn,
2488 const char *private_key,
2489 const char *private_key_passwd,
2490 const u8 *private_key_blob,
2491 size_t private_key_blob_len)
2492 {
2493 SSL_CTX *ssl_ctx = data->ssl;
2494 char *passwd;
2495 int ok;
2496
2497 if (private_key == NULL && private_key_blob == NULL)
2498 return 0;
2499
2500 if (private_key_passwd) {
2501 passwd = os_strdup(private_key_passwd);
2502 if (passwd == NULL)
2503 return -1;
2504 } else
2505 passwd = NULL;
2506
2507 SSL_CTX_set_default_passwd_cb(ssl_ctx, tls_passwd_cb);
2508 SSL_CTX_set_default_passwd_cb_userdata(ssl_ctx, passwd);
2509
2510 ok = 0;
2511 while (private_key_blob) {
2512 if (SSL_use_PrivateKey_ASN1(EVP_PKEY_RSA, conn->ssl,
2513 (u8 *) private_key_blob,
2514 private_key_blob_len) == 1) {
2515 wpa_printf(MSG_DEBUG, "OpenSSL: SSL_use_PrivateKey_"
2516 "ASN1(EVP_PKEY_RSA) --> OK");
2517 ok = 1;
2518 break;
2519 }
2520
2521 if (SSL_use_PrivateKey_ASN1(EVP_PKEY_DSA, conn->ssl,
2522 (u8 *) private_key_blob,
2523 private_key_blob_len) == 1) {
2524 wpa_printf(MSG_DEBUG, "OpenSSL: SSL_use_PrivateKey_"
2525 "ASN1(EVP_PKEY_DSA) --> OK");
2526 ok = 1;
2527 break;
2528 }
2529
2530 if (SSL_use_RSAPrivateKey_ASN1(conn->ssl,
2531 (u8 *) private_key_blob,
2532 private_key_blob_len) == 1) {
2533 wpa_printf(MSG_DEBUG, "OpenSSL: "
2534 "SSL_use_RSAPrivateKey_ASN1 --> OK");
2535 ok = 1;
2536 break;
2537 }
2538
2539 if (tls_read_pkcs12_blob(data, conn->ssl, private_key_blob,
2540 private_key_blob_len, passwd) == 0) {
2541 wpa_printf(MSG_DEBUG, "OpenSSL: PKCS#12 as blob --> "
2542 "OK");
2543 ok = 1;
2544 break;
2545 }
2546
2547 break;
2548 }
2549
2550 while (!ok && private_key) {
2551 #ifndef OPENSSL_NO_STDIO
2552 if (SSL_use_PrivateKey_file(conn->ssl, private_key,
2553 SSL_FILETYPE_ASN1) == 1) {
2554 wpa_printf(MSG_DEBUG, "OpenSSL: "
2555 "SSL_use_PrivateKey_File (DER) --> OK");
2556 ok = 1;
2557 break;
2558 }
2559
2560 if (SSL_use_PrivateKey_file(conn->ssl, private_key,
2561 SSL_FILETYPE_PEM) == 1) {
2562 wpa_printf(MSG_DEBUG, "OpenSSL: "
2563 "SSL_use_PrivateKey_File (PEM) --> OK");
2564 ok = 1;
2565 break;
2566 }
2567 #else /* OPENSSL_NO_STDIO */
2568 wpa_printf(MSG_DEBUG, "OpenSSL: %s - OPENSSL_NO_STDIO",
2569 __func__);
2570 #endif /* OPENSSL_NO_STDIO */
2571
2572 if (tls_read_pkcs12(data, conn->ssl, private_key, passwd)
2573 == 0) {
2574 wpa_printf(MSG_DEBUG, "OpenSSL: Reading PKCS#12 file "
2575 "--> OK");
2576 ok = 1;
2577 break;
2578 }
2579
2580 if (tls_cryptoapi_cert(conn->ssl, private_key) == 0) {
2581 wpa_printf(MSG_DEBUG, "OpenSSL: Using CryptoAPI to "
2582 "access certificate store --> OK");
2583 ok = 1;
2584 break;
2585 }
2586
2587 break;
2588 }
2589
2590 if (!ok) {
2591 tls_show_errors(MSG_INFO, __func__,
2592 "Failed to load private key");
2593 os_free(passwd);
2594 return -1;
2595 }
2596 ERR_clear_error();
2597 SSL_CTX_set_default_passwd_cb(ssl_ctx, NULL);
2598 os_free(passwd);
2599
2600 if (!SSL_check_private_key(conn->ssl)) {
2601 tls_show_errors(MSG_INFO, __func__, "Private key failed "
2602 "verification");
2603 return -1;
2604 }
2605
2606 wpa_printf(MSG_DEBUG, "SSL: Private key loaded successfully");
2607 return 0;
2608 }
2609
2610
tls_global_private_key(struct tls_data * data,const char * private_key,const char * private_key_passwd)2611 static int tls_global_private_key(struct tls_data *data,
2612 const char *private_key,
2613 const char *private_key_passwd)
2614 {
2615 SSL_CTX *ssl_ctx = data->ssl;
2616 char *passwd;
2617
2618 if (private_key == NULL)
2619 return 0;
2620
2621 if (private_key_passwd) {
2622 passwd = os_strdup(private_key_passwd);
2623 if (passwd == NULL)
2624 return -1;
2625 } else
2626 passwd = NULL;
2627
2628 SSL_CTX_set_default_passwd_cb(ssl_ctx, tls_passwd_cb);
2629 SSL_CTX_set_default_passwd_cb_userdata(ssl_ctx, passwd);
2630 if (
2631 #ifndef OPENSSL_NO_STDIO
2632 SSL_CTX_use_PrivateKey_file(ssl_ctx, private_key,
2633 SSL_FILETYPE_ASN1) != 1 &&
2634 SSL_CTX_use_PrivateKey_file(ssl_ctx, private_key,
2635 SSL_FILETYPE_PEM) != 1 &&
2636 #endif /* OPENSSL_NO_STDIO */
2637 tls_read_pkcs12(data, NULL, private_key, passwd)) {
2638 tls_show_errors(MSG_INFO, __func__,
2639 "Failed to load private key");
2640 os_free(passwd);
2641 ERR_clear_error();
2642 return -1;
2643 }
2644 os_free(passwd);
2645 ERR_clear_error();
2646 SSL_CTX_set_default_passwd_cb(ssl_ctx, NULL);
2647
2648 if (!SSL_CTX_check_private_key(ssl_ctx)) {
2649 tls_show_errors(MSG_INFO, __func__,
2650 "Private key failed verification");
2651 return -1;
2652 }
2653
2654 return 0;
2655 }
2656
2657
tls_connection_dh(struct tls_connection * conn,const char * dh_file)2658 static int tls_connection_dh(struct tls_connection *conn, const char *dh_file)
2659 {
2660 #ifdef OPENSSL_NO_DH
2661 if (dh_file == NULL)
2662 return 0;
2663 wpa_printf(MSG_ERROR, "TLS: openssl does not include DH support, but "
2664 "dh_file specified");
2665 return -1;
2666 #else /* OPENSSL_NO_DH */
2667 DH *dh;
2668 BIO *bio;
2669
2670 /* TODO: add support for dh_blob */
2671 if (dh_file == NULL)
2672 return 0;
2673 if (conn == NULL)
2674 return -1;
2675
2676 bio = BIO_new_file(dh_file, "r");
2677 if (bio == NULL) {
2678 wpa_printf(MSG_INFO, "TLS: Failed to open DH file '%s': %s",
2679 dh_file, ERR_error_string(ERR_get_error(), NULL));
2680 return -1;
2681 }
2682 dh = PEM_read_bio_DHparams(bio, NULL, NULL, NULL);
2683 BIO_free(bio);
2684 #ifndef OPENSSL_NO_DSA
2685 while (dh == NULL) {
2686 DSA *dsa;
2687 wpa_printf(MSG_DEBUG, "TLS: Failed to parse DH file '%s': %s -"
2688 " trying to parse as DSA params", dh_file,
2689 ERR_error_string(ERR_get_error(), NULL));
2690 bio = BIO_new_file(dh_file, "r");
2691 if (bio == NULL)
2692 break;
2693 dsa = PEM_read_bio_DSAparams(bio, NULL, NULL, NULL);
2694 BIO_free(bio);
2695 if (!dsa) {
2696 wpa_printf(MSG_DEBUG, "TLS: Failed to parse DSA file "
2697 "'%s': %s", dh_file,
2698 ERR_error_string(ERR_get_error(), NULL));
2699 break;
2700 }
2701
2702 wpa_printf(MSG_DEBUG, "TLS: DH file in DSA param format");
2703 dh = DSA_dup_DH(dsa);
2704 DSA_free(dsa);
2705 if (dh == NULL) {
2706 wpa_printf(MSG_INFO, "TLS: Failed to convert DSA "
2707 "params into DH params");
2708 break;
2709 }
2710 break;
2711 }
2712 #endif /* !OPENSSL_NO_DSA */
2713 if (dh == NULL) {
2714 wpa_printf(MSG_INFO, "TLS: Failed to read/parse DH/DSA file "
2715 "'%s'", dh_file);
2716 return -1;
2717 }
2718
2719 if (SSL_set_tmp_dh(conn->ssl, dh) != 1) {
2720 wpa_printf(MSG_INFO, "TLS: Failed to set DH params from '%s': "
2721 "%s", dh_file,
2722 ERR_error_string(ERR_get_error(), NULL));
2723 DH_free(dh);
2724 return -1;
2725 }
2726 DH_free(dh);
2727 return 0;
2728 #endif /* OPENSSL_NO_DH */
2729 }
2730
2731
tls_global_dh(struct tls_data * data,const char * dh_file)2732 static int tls_global_dh(struct tls_data *data, const char *dh_file)
2733 {
2734 #ifdef OPENSSL_NO_DH
2735 if (dh_file == NULL)
2736 return 0;
2737 wpa_printf(MSG_ERROR, "TLS: openssl does not include DH support, but "
2738 "dh_file specified");
2739 return -1;
2740 #else /* OPENSSL_NO_DH */
2741 SSL_CTX *ssl_ctx = data->ssl;
2742 DH *dh;
2743 BIO *bio;
2744
2745 /* TODO: add support for dh_blob */
2746 if (dh_file == NULL)
2747 return 0;
2748 if (ssl_ctx == NULL)
2749 return -1;
2750
2751 bio = BIO_new_file(dh_file, "r");
2752 if (bio == NULL) {
2753 wpa_printf(MSG_INFO, "TLS: Failed to open DH file '%s': %s",
2754 dh_file, ERR_error_string(ERR_get_error(), NULL));
2755 return -1;
2756 }
2757 dh = PEM_read_bio_DHparams(bio, NULL, NULL, NULL);
2758 BIO_free(bio);
2759 #ifndef OPENSSL_NO_DSA
2760 while (dh == NULL) {
2761 DSA *dsa;
2762 wpa_printf(MSG_DEBUG, "TLS: Failed to parse DH file '%s': %s -"
2763 " trying to parse as DSA params", dh_file,
2764 ERR_error_string(ERR_get_error(), NULL));
2765 bio = BIO_new_file(dh_file, "r");
2766 if (bio == NULL)
2767 break;
2768 dsa = PEM_read_bio_DSAparams(bio, NULL, NULL, NULL);
2769 BIO_free(bio);
2770 if (!dsa) {
2771 wpa_printf(MSG_DEBUG, "TLS: Failed to parse DSA file "
2772 "'%s': %s", dh_file,
2773 ERR_error_string(ERR_get_error(), NULL));
2774 break;
2775 }
2776
2777 wpa_printf(MSG_DEBUG, "TLS: DH file in DSA param format");
2778 dh = DSA_dup_DH(dsa);
2779 DSA_free(dsa);
2780 if (dh == NULL) {
2781 wpa_printf(MSG_INFO, "TLS: Failed to convert DSA "
2782 "params into DH params");
2783 break;
2784 }
2785 break;
2786 }
2787 #endif /* !OPENSSL_NO_DSA */
2788 if (dh == NULL) {
2789 wpa_printf(MSG_INFO, "TLS: Failed to read/parse DH/DSA file "
2790 "'%s'", dh_file);
2791 return -1;
2792 }
2793
2794 if (SSL_CTX_set_tmp_dh(ssl_ctx, dh) != 1) {
2795 wpa_printf(MSG_INFO, "TLS: Failed to set DH params from '%s': "
2796 "%s", dh_file,
2797 ERR_error_string(ERR_get_error(), NULL));
2798 DH_free(dh);
2799 return -1;
2800 }
2801 DH_free(dh);
2802 return 0;
2803 #endif /* OPENSSL_NO_DH */
2804 }
2805
2806
tls_connection_get_random(void * ssl_ctx,struct tls_connection * conn,struct tls_random * keys)2807 int tls_connection_get_random(void *ssl_ctx, struct tls_connection *conn,
2808 struct tls_random *keys)
2809 {
2810 SSL *ssl;
2811
2812 if (conn == NULL || keys == NULL)
2813 return -1;
2814 ssl = conn->ssl;
2815 #if OPENSSL_VERSION_NUMBER < 0x10100000L
2816 if (ssl == NULL || ssl->s3 == NULL || ssl->session == NULL)
2817 return -1;
2818
2819 os_memset(keys, 0, sizeof(*keys));
2820 keys->client_random = ssl->s3->client_random;
2821 keys->client_random_len = SSL3_RANDOM_SIZE;
2822 keys->server_random = ssl->s3->server_random;
2823 keys->server_random_len = SSL3_RANDOM_SIZE;
2824 #else
2825 if (ssl == NULL)
2826 return -1;
2827
2828 os_memset(keys, 0, sizeof(*keys));
2829 keys->client_random = conn->client_random;
2830 keys->client_random_len = SSL_get_client_random(
2831 ssl, conn->client_random, sizeof(conn->client_random));
2832 keys->server_random = conn->server_random;
2833 keys->server_random_len = SSL_get_server_random(
2834 ssl, conn->server_random, sizeof(conn->server_random));
2835 #endif
2836
2837 return 0;
2838 }
2839
2840
2841 #ifndef CONFIG_FIPS
openssl_get_keyblock_size(SSL * ssl)2842 static int openssl_get_keyblock_size(SSL *ssl)
2843 {
2844 #if OPENSSL_VERSION_NUMBER < 0x10100000L
2845 const EVP_CIPHER *c;
2846 const EVP_MD *h;
2847 int md_size;
2848
2849 if (ssl->enc_read_ctx == NULL || ssl->enc_read_ctx->cipher == NULL ||
2850 ssl->read_hash == NULL)
2851 return -1;
2852
2853 c = ssl->enc_read_ctx->cipher;
2854 #if OPENSSL_VERSION_NUMBER >= 0x00909000L
2855 h = EVP_MD_CTX_md(ssl->read_hash);
2856 #else
2857 h = ssl->read_hash;
2858 #endif
2859 if (h)
2860 md_size = EVP_MD_size(h);
2861 #if OPENSSL_VERSION_NUMBER >= 0x10000000L
2862 else if (ssl->s3)
2863 md_size = ssl->s3->tmp.new_mac_secret_size;
2864 #endif
2865 else
2866 return -1;
2867
2868 wpa_printf(MSG_DEBUG, "OpenSSL: keyblock size: key_len=%d MD_size=%d "
2869 "IV_len=%d", EVP_CIPHER_key_length(c), md_size,
2870 EVP_CIPHER_iv_length(c));
2871 return 2 * (EVP_CIPHER_key_length(c) +
2872 md_size +
2873 EVP_CIPHER_iv_length(c));
2874 #else
2875 const SSL_CIPHER *ssl_cipher;
2876 int cipher, digest;
2877 const EVP_CIPHER *c;
2878 const EVP_MD *h;
2879
2880 ssl_cipher = SSL_get_current_cipher(ssl);
2881 if (!ssl_cipher)
2882 return -1;
2883 cipher = SSL_CIPHER_get_cipher_nid(ssl_cipher);
2884 digest = SSL_CIPHER_get_digest_nid(ssl_cipher);
2885 wpa_printf(MSG_DEBUG, "OpenSSL: cipher nid %d digest nid %d",
2886 cipher, digest);
2887 if (cipher < 0 || digest < 0)
2888 return -1;
2889 c = EVP_get_cipherbynid(cipher);
2890 h = EVP_get_digestbynid(digest);
2891 if (!c || !h)
2892 return -1;
2893
2894 wpa_printf(MSG_DEBUG,
2895 "OpenSSL: keyblock size: key_len=%d MD_size=%d IV_len=%d",
2896 EVP_CIPHER_key_length(c), EVP_MD_size(h),
2897 EVP_CIPHER_iv_length(c));
2898 return 2 * (EVP_CIPHER_key_length(c) + EVP_MD_size(h) +
2899 EVP_CIPHER_iv_length(c));
2900 #endif
2901 }
2902 #endif /* CONFIG_FIPS */
2903
2904
openssl_tls_prf(struct tls_connection * conn,const char * label,int server_random_first,int skip_keyblock,u8 * out,size_t out_len)2905 static int openssl_tls_prf(struct tls_connection *conn,
2906 const char *label, int server_random_first,
2907 int skip_keyblock, u8 *out, size_t out_len)
2908 {
2909 #ifdef CONFIG_FIPS
2910 wpa_printf(MSG_ERROR, "OpenSSL: TLS keys cannot be exported in FIPS "
2911 "mode");
2912 return -1;
2913 #else /* CONFIG_FIPS */
2914 #if OPENSSL_VERSION_NUMBER < 0x10100000L
2915 SSL *ssl;
2916 u8 *rnd;
2917 int ret = -1;
2918 int skip = 0;
2919 u8 *tmp_out = NULL;
2920 u8 *_out = out;
2921 const char *ver;
2922
2923 /*
2924 * TLS library did not support key generation, so get the needed TLS
2925 * session parameters and use an internal implementation of TLS PRF to
2926 * derive the key.
2927 */
2928
2929 if (conn == NULL)
2930 return -1;
2931 ssl = conn->ssl;
2932 if (ssl == NULL || ssl->s3 == NULL || ssl->session == NULL ||
2933 ssl->session->master_key_length <= 0)
2934 return -1;
2935 ver = SSL_get_version(ssl);
2936
2937 if (skip_keyblock) {
2938 skip = openssl_get_keyblock_size(ssl);
2939 if (skip < 0)
2940 return -1;
2941 tmp_out = os_malloc(skip + out_len);
2942 if (!tmp_out)
2943 return -1;
2944 _out = tmp_out;
2945 }
2946
2947 rnd = os_malloc(2 * SSL3_RANDOM_SIZE);
2948 if (!rnd) {
2949 os_free(tmp_out);
2950 return -1;
2951 }
2952
2953 if (server_random_first) {
2954 os_memcpy(rnd, ssl->s3->server_random, SSL3_RANDOM_SIZE);
2955 os_memcpy(rnd + SSL3_RANDOM_SIZE, ssl->s3->client_random,
2956 SSL3_RANDOM_SIZE);
2957 } else {
2958 os_memcpy(rnd, ssl->s3->client_random, SSL3_RANDOM_SIZE);
2959 os_memcpy(rnd + SSL3_RANDOM_SIZE, ssl->s3->server_random,
2960 SSL3_RANDOM_SIZE);
2961 }
2962
2963 if (os_strcmp(ver, "TLSv1.2") == 0) {
2964 tls_prf_sha256(ssl->session->master_key,
2965 ssl->session->master_key_length,
2966 label, rnd, 2 * SSL3_RANDOM_SIZE,
2967 _out, skip + out_len);
2968 ret = 0;
2969 } else if (tls_prf_sha1_md5(ssl->session->master_key,
2970 ssl->session->master_key_length,
2971 label, rnd, 2 * SSL3_RANDOM_SIZE,
2972 _out, skip + out_len) == 0) {
2973 ret = 0;
2974 }
2975 os_free(rnd);
2976 if (ret == 0 && skip_keyblock)
2977 os_memcpy(out, _out + skip, out_len);
2978 bin_clear_free(tmp_out, skip);
2979
2980 return ret;
2981 #else
2982 SSL *ssl;
2983 SSL_SESSION *sess;
2984 u8 *rnd;
2985 int ret = -1;
2986 int skip = 0;
2987 u8 *tmp_out = NULL;
2988 u8 *_out = out;
2989 unsigned char client_random[SSL3_RANDOM_SIZE];
2990 unsigned char server_random[SSL3_RANDOM_SIZE];
2991 unsigned char master_key[64];
2992 size_t master_key_len;
2993 const char *ver;
2994
2995 /*
2996 * TLS library did not support key generation, so get the needed TLS
2997 * session parameters and use an internal implementation of TLS PRF to
2998 * derive the key.
2999 */
3000
3001 if (conn == NULL)
3002 return -1;
3003 ssl = conn->ssl;
3004 if (ssl == NULL)
3005 return -1;
3006 ver = SSL_get_version(ssl);
3007 sess = SSL_get_session(ssl);
3008 if (!ver || !sess)
3009 return -1;
3010
3011 if (skip_keyblock) {
3012 skip = openssl_get_keyblock_size(ssl);
3013 if (skip < 0)
3014 return -1;
3015 tmp_out = os_malloc(skip + out_len);
3016 if (!tmp_out)
3017 return -1;
3018 _out = tmp_out;
3019 }
3020
3021 rnd = os_malloc(2 * SSL3_RANDOM_SIZE);
3022 if (!rnd) {
3023 os_free(tmp_out);
3024 return -1;
3025 }
3026
3027 SSL_get_client_random(ssl, client_random, sizeof(client_random));
3028 SSL_get_server_random(ssl, server_random, sizeof(server_random));
3029 master_key_len = SSL_SESSION_get_master_key(sess, master_key,
3030 sizeof(master_key));
3031
3032 if (server_random_first) {
3033 os_memcpy(rnd, server_random, SSL3_RANDOM_SIZE);
3034 os_memcpy(rnd + SSL3_RANDOM_SIZE, client_random,
3035 SSL3_RANDOM_SIZE);
3036 } else {
3037 os_memcpy(rnd, client_random, SSL3_RANDOM_SIZE);
3038 os_memcpy(rnd + SSL3_RANDOM_SIZE, server_random,
3039 SSL3_RANDOM_SIZE);
3040 }
3041
3042 if (os_strcmp(ver, "TLSv1.2") == 0) {
3043 tls_prf_sha256(master_key, master_key_len,
3044 label, rnd, 2 * SSL3_RANDOM_SIZE,
3045 _out, skip + out_len);
3046 ret = 0;
3047 } else if (tls_prf_sha1_md5(master_key, master_key_len,
3048 label, rnd, 2 * SSL3_RANDOM_SIZE,
3049 _out, skip + out_len) == 0) {
3050 ret = 0;
3051 }
3052 os_memset(master_key, 0, sizeof(master_key));
3053 os_free(rnd);
3054 if (ret == 0 && skip_keyblock)
3055 os_memcpy(out, _out + skip, out_len);
3056 bin_clear_free(tmp_out, skip);
3057
3058 return ret;
3059 #endif
3060 #endif /* CONFIG_FIPS */
3061 }
3062
3063
tls_connection_prf(void * tls_ctx,struct tls_connection * conn,const char * label,int server_random_first,int skip_keyblock,u8 * out,size_t out_len)3064 int tls_connection_prf(void *tls_ctx, struct tls_connection *conn,
3065 const char *label, int server_random_first,
3066 int skip_keyblock, u8 *out, size_t out_len)
3067 {
3068 #if OPENSSL_VERSION_NUMBER >= 0x10001000L
3069 SSL *ssl;
3070 if (conn == NULL)
3071 return -1;
3072 if (server_random_first || skip_keyblock)
3073 return openssl_tls_prf(conn, label,
3074 server_random_first, skip_keyblock,
3075 out, out_len);
3076 ssl = conn->ssl;
3077 if (SSL_export_keying_material(ssl, out, out_len, label,
3078 os_strlen(label), NULL, 0, 0) == 1) {
3079 wpa_printf(MSG_DEBUG, "OpenSSL: Using internal PRF");
3080 return 0;
3081 }
3082 #endif
3083 return openssl_tls_prf(conn, label, server_random_first,
3084 skip_keyblock, out, out_len);
3085 }
3086
3087
3088 static struct wpabuf *
openssl_handshake(struct tls_connection * conn,const struct wpabuf * in_data,int server)3089 openssl_handshake(struct tls_connection *conn, const struct wpabuf *in_data,
3090 int server)
3091 {
3092 int res;
3093 struct wpabuf *out_data;
3094
3095 /*
3096 * Give TLS handshake data from the server (if available) to OpenSSL
3097 * for processing.
3098 */
3099 if (in_data && wpabuf_len(in_data) > 0 &&
3100 BIO_write(conn->ssl_in, wpabuf_head(in_data), wpabuf_len(in_data))
3101 < 0) {
3102 tls_show_errors(MSG_INFO, __func__,
3103 "Handshake failed - BIO_write");
3104 return NULL;
3105 }
3106
3107 /* Initiate TLS handshake or continue the existing handshake */
3108 if (server)
3109 res = SSL_accept(conn->ssl);
3110 else
3111 res = SSL_connect(conn->ssl);
3112 if (res != 1) {
3113 int err = SSL_get_error(conn->ssl, res);
3114 if (err == SSL_ERROR_WANT_READ)
3115 wpa_printf(MSG_DEBUG, "SSL: SSL_connect - want "
3116 "more data");
3117 else if (err == SSL_ERROR_WANT_WRITE)
3118 wpa_printf(MSG_DEBUG, "SSL: SSL_connect - want to "
3119 "write");
3120 else {
3121 tls_show_errors(MSG_INFO, __func__, "SSL_connect");
3122 conn->failed++;
3123 }
3124 }
3125
3126 /* Get the TLS handshake data to be sent to the server */
3127 res = BIO_ctrl_pending(conn->ssl_out);
3128 wpa_printf(MSG_DEBUG, "SSL: %d bytes pending from ssl_out", res);
3129 out_data = wpabuf_alloc(res);
3130 if (out_data == NULL) {
3131 wpa_printf(MSG_DEBUG, "SSL: Failed to allocate memory for "
3132 "handshake output (%d bytes)", res);
3133 if (BIO_reset(conn->ssl_out) < 0) {
3134 tls_show_errors(MSG_INFO, __func__,
3135 "BIO_reset failed");
3136 }
3137 return NULL;
3138 }
3139 res = res == 0 ? 0 : BIO_read(conn->ssl_out, wpabuf_mhead(out_data),
3140 res);
3141 if (res < 0) {
3142 tls_show_errors(MSG_INFO, __func__,
3143 "Handshake failed - BIO_read");
3144 if (BIO_reset(conn->ssl_out) < 0) {
3145 tls_show_errors(MSG_INFO, __func__,
3146 "BIO_reset failed");
3147 }
3148 wpabuf_free(out_data);
3149 return NULL;
3150 }
3151 wpabuf_put(out_data, res);
3152
3153 return out_data;
3154 }
3155
3156
3157 static struct wpabuf *
openssl_get_appl_data(struct tls_connection * conn,size_t max_len)3158 openssl_get_appl_data(struct tls_connection *conn, size_t max_len)
3159 {
3160 struct wpabuf *appl_data;
3161 int res;
3162
3163 appl_data = wpabuf_alloc(max_len + 100);
3164 if (appl_data == NULL)
3165 return NULL;
3166
3167 res = SSL_read(conn->ssl, wpabuf_mhead(appl_data),
3168 wpabuf_size(appl_data));
3169 if (res < 0) {
3170 int err = SSL_get_error(conn->ssl, res);
3171 if (err == SSL_ERROR_WANT_READ ||
3172 err == SSL_ERROR_WANT_WRITE) {
3173 wpa_printf(MSG_DEBUG, "SSL: No Application Data "
3174 "included");
3175 } else {
3176 tls_show_errors(MSG_INFO, __func__,
3177 "Failed to read possible "
3178 "Application Data");
3179 }
3180 wpabuf_free(appl_data);
3181 return NULL;
3182 }
3183
3184 wpabuf_put(appl_data, res);
3185 wpa_hexdump_buf_key(MSG_MSGDUMP, "SSL: Application Data in Finished "
3186 "message", appl_data);
3187
3188 return appl_data;
3189 }
3190
3191
3192 static struct wpabuf *
openssl_connection_handshake(struct tls_connection * conn,const struct wpabuf * in_data,struct wpabuf ** appl_data,int server)3193 openssl_connection_handshake(struct tls_connection *conn,
3194 const struct wpabuf *in_data,
3195 struct wpabuf **appl_data, int server)
3196 {
3197 struct wpabuf *out_data;
3198
3199 if (appl_data)
3200 *appl_data = NULL;
3201
3202 out_data = openssl_handshake(conn, in_data, server);
3203 if (out_data == NULL)
3204 return NULL;
3205 if (conn->invalid_hb_used) {
3206 wpa_printf(MSG_INFO, "TLS: Heartbeat attack detected - do not send response");
3207 wpabuf_free(out_data);
3208 return NULL;
3209 }
3210
3211 if (SSL_is_init_finished(conn->ssl)) {
3212 wpa_printf(MSG_DEBUG,
3213 "OpenSSL: Handshake finished - resumed=%d",
3214 tls_connection_resumed(conn->ssl_ctx, conn));
3215 if (appl_data && in_data)
3216 *appl_data = openssl_get_appl_data(conn,
3217 wpabuf_len(in_data));
3218 }
3219
3220 if (conn->invalid_hb_used) {
3221 wpa_printf(MSG_INFO, "TLS: Heartbeat attack detected - do not send response");
3222 if (appl_data) {
3223 wpabuf_free(*appl_data);
3224 *appl_data = NULL;
3225 }
3226 wpabuf_free(out_data);
3227 return NULL;
3228 }
3229
3230 return out_data;
3231 }
3232
3233
3234 struct wpabuf *
tls_connection_handshake(void * ssl_ctx,struct tls_connection * conn,const struct wpabuf * in_data,struct wpabuf ** appl_data)3235 tls_connection_handshake(void *ssl_ctx, struct tls_connection *conn,
3236 const struct wpabuf *in_data,
3237 struct wpabuf **appl_data)
3238 {
3239 return openssl_connection_handshake(conn, in_data, appl_data, 0);
3240 }
3241
3242
tls_connection_server_handshake(void * tls_ctx,struct tls_connection * conn,const struct wpabuf * in_data,struct wpabuf ** appl_data)3243 struct wpabuf * tls_connection_server_handshake(void *tls_ctx,
3244 struct tls_connection *conn,
3245 const struct wpabuf *in_data,
3246 struct wpabuf **appl_data)
3247 {
3248 return openssl_connection_handshake(conn, in_data, appl_data, 1);
3249 }
3250
3251
tls_connection_encrypt(void * tls_ctx,struct tls_connection * conn,const struct wpabuf * in_data)3252 struct wpabuf * tls_connection_encrypt(void *tls_ctx,
3253 struct tls_connection *conn,
3254 const struct wpabuf *in_data)
3255 {
3256 int res;
3257 struct wpabuf *buf;
3258
3259 if (conn == NULL)
3260 return NULL;
3261
3262 /* Give plaintext data for OpenSSL to encrypt into the TLS tunnel. */
3263 if ((res = BIO_reset(conn->ssl_in)) < 0 ||
3264 (res = BIO_reset(conn->ssl_out)) < 0) {
3265 tls_show_errors(MSG_INFO, __func__, "BIO_reset failed");
3266 return NULL;
3267 }
3268 res = SSL_write(conn->ssl, wpabuf_head(in_data), wpabuf_len(in_data));
3269 if (res < 0) {
3270 tls_show_errors(MSG_INFO, __func__,
3271 "Encryption failed - SSL_write");
3272 return NULL;
3273 }
3274
3275 /* Read encrypted data to be sent to the server */
3276 buf = wpabuf_alloc(wpabuf_len(in_data) + 300);
3277 if (buf == NULL)
3278 return NULL;
3279 res = BIO_read(conn->ssl_out, wpabuf_mhead(buf), wpabuf_size(buf));
3280 if (res < 0) {
3281 tls_show_errors(MSG_INFO, __func__,
3282 "Encryption failed - BIO_read");
3283 wpabuf_free(buf);
3284 return NULL;
3285 }
3286 wpabuf_put(buf, res);
3287
3288 return buf;
3289 }
3290
3291
tls_connection_decrypt(void * tls_ctx,struct tls_connection * conn,const struct wpabuf * in_data)3292 struct wpabuf * tls_connection_decrypt(void *tls_ctx,
3293 struct tls_connection *conn,
3294 const struct wpabuf *in_data)
3295 {
3296 int res;
3297 struct wpabuf *buf;
3298
3299 /* Give encrypted data from TLS tunnel for OpenSSL to decrypt. */
3300 res = BIO_write(conn->ssl_in, wpabuf_head(in_data),
3301 wpabuf_len(in_data));
3302 if (res < 0) {
3303 tls_show_errors(MSG_INFO, __func__,
3304 "Decryption failed - BIO_write");
3305 return NULL;
3306 }
3307 if (BIO_reset(conn->ssl_out) < 0) {
3308 tls_show_errors(MSG_INFO, __func__, "BIO_reset failed");
3309 return NULL;
3310 }
3311
3312 /* Read decrypted data for further processing */
3313 /*
3314 * Even though we try to disable TLS compression, it is possible that
3315 * this cannot be done with all TLS libraries. Add extra buffer space
3316 * to handle the possibility of the decrypted data being longer than
3317 * input data.
3318 */
3319 buf = wpabuf_alloc((wpabuf_len(in_data) + 500) * 3);
3320 if (buf == NULL)
3321 return NULL;
3322 res = SSL_read(conn->ssl, wpabuf_mhead(buf), wpabuf_size(buf));
3323 if (res < 0) {
3324 tls_show_errors(MSG_INFO, __func__,
3325 "Decryption failed - SSL_read");
3326 wpabuf_free(buf);
3327 return NULL;
3328 }
3329 wpabuf_put(buf, res);
3330
3331 if (conn->invalid_hb_used) {
3332 wpa_printf(MSG_INFO, "TLS: Heartbeat attack detected - do not send response");
3333 wpabuf_free(buf);
3334 return NULL;
3335 }
3336
3337 return buf;
3338 }
3339
3340
tls_connection_resumed(void * ssl_ctx,struct tls_connection * conn)3341 int tls_connection_resumed(void *ssl_ctx, struct tls_connection *conn)
3342 {
3343 #if OPENSSL_VERSION_NUMBER >= 0x10001000L
3344 return conn ? SSL_cache_hit(conn->ssl) : 0;
3345 #else
3346 return conn ? conn->ssl->hit : 0;
3347 #endif
3348 }
3349
3350
tls_connection_set_cipher_list(void * tls_ctx,struct tls_connection * conn,u8 * ciphers)3351 int tls_connection_set_cipher_list(void *tls_ctx, struct tls_connection *conn,
3352 u8 *ciphers)
3353 {
3354 char buf[100], *pos, *end;
3355 u8 *c;
3356 int ret;
3357
3358 if (conn == NULL || conn->ssl == NULL || ciphers == NULL)
3359 return -1;
3360
3361 buf[0] = '\0';
3362 pos = buf;
3363 end = pos + sizeof(buf);
3364
3365 c = ciphers;
3366 while (*c != TLS_CIPHER_NONE) {
3367 const char *suite;
3368
3369 switch (*c) {
3370 case TLS_CIPHER_RC4_SHA:
3371 suite = "RC4-SHA";
3372 break;
3373 case TLS_CIPHER_AES128_SHA:
3374 suite = "AES128-SHA";
3375 break;
3376 case TLS_CIPHER_RSA_DHE_AES128_SHA:
3377 suite = "DHE-RSA-AES128-SHA";
3378 break;
3379 case TLS_CIPHER_ANON_DH_AES128_SHA:
3380 suite = "ADH-AES128-SHA";
3381 break;
3382 default:
3383 wpa_printf(MSG_DEBUG, "TLS: Unsupported "
3384 "cipher selection: %d", *c);
3385 return -1;
3386 }
3387 ret = os_snprintf(pos, end - pos, ":%s", suite);
3388 if (os_snprintf_error(end - pos, ret))
3389 break;
3390 pos += ret;
3391
3392 c++;
3393 }
3394
3395 wpa_printf(MSG_DEBUG, "OpenSSL: cipher suites: %s", buf + 1);
3396
3397 #if OPENSSL_VERSION_NUMBER >= 0x10100000L
3398 #if defined(EAP_FAST) || defined(EAP_FAST_DYNAMIC) || defined(EAP_SERVER_FAST)
3399 if (os_strstr(buf, ":ADH-")) {
3400 /*
3401 * Need to drop to security level 0 to allow anonymous
3402 * cipher suites for EAP-FAST.
3403 */
3404 SSL_set_security_level(conn->ssl, 0);
3405 } else if (SSL_get_security_level(conn->ssl) == 0) {
3406 /* Force at least security level 1 */
3407 SSL_set_security_level(conn->ssl, 1);
3408 }
3409 #endif /* EAP_FAST || EAP_FAST_DYNAMIC || EAP_SERVER_FAST */
3410 #endif
3411
3412 if (SSL_set_cipher_list(conn->ssl, buf + 1) != 1) {
3413 tls_show_errors(MSG_INFO, __func__,
3414 "Cipher suite configuration failed");
3415 return -1;
3416 }
3417
3418 return 0;
3419 }
3420
3421
tls_get_version(void * ssl_ctx,struct tls_connection * conn,char * buf,size_t buflen)3422 int tls_get_version(void *ssl_ctx, struct tls_connection *conn,
3423 char *buf, size_t buflen)
3424 {
3425 const char *name;
3426 if (conn == NULL || conn->ssl == NULL)
3427 return -1;
3428
3429 name = SSL_get_version(conn->ssl);
3430 if (name == NULL)
3431 return -1;
3432
3433 os_strlcpy(buf, name, buflen);
3434 return 0;
3435 }
3436
3437
tls_get_cipher(void * ssl_ctx,struct tls_connection * conn,char * buf,size_t buflen)3438 int tls_get_cipher(void *ssl_ctx, struct tls_connection *conn,
3439 char *buf, size_t buflen)
3440 {
3441 const char *name;
3442 if (conn == NULL || conn->ssl == NULL)
3443 return -1;
3444
3445 name = SSL_get_cipher(conn->ssl);
3446 if (name == NULL)
3447 return -1;
3448
3449 os_strlcpy(buf, name, buflen);
3450 return 0;
3451 }
3452
3453
tls_connection_enable_workaround(void * ssl_ctx,struct tls_connection * conn)3454 int tls_connection_enable_workaround(void *ssl_ctx,
3455 struct tls_connection *conn)
3456 {
3457 SSL_set_options(conn->ssl, SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS);
3458
3459 return 0;
3460 }
3461
3462
3463 #if defined(EAP_FAST) || defined(EAP_FAST_DYNAMIC) || defined(EAP_SERVER_FAST)
3464 /* ClientHello TLS extensions require a patch to openssl, so this function is
3465 * commented out unless explicitly needed for EAP-FAST in order to be able to
3466 * build this file with unmodified openssl. */
tls_connection_client_hello_ext(void * ssl_ctx,struct tls_connection * conn,int ext_type,const u8 * data,size_t data_len)3467 int tls_connection_client_hello_ext(void *ssl_ctx, struct tls_connection *conn,
3468 int ext_type, const u8 *data,
3469 size_t data_len)
3470 {
3471 if (conn == NULL || conn->ssl == NULL || ext_type != 35)
3472 return -1;
3473
3474 if (SSL_set_session_ticket_ext(conn->ssl, (void *) data,
3475 data_len) != 1)
3476 return -1;
3477
3478 return 0;
3479 }
3480 #endif /* EAP_FAST || EAP_FAST_DYNAMIC || EAP_SERVER_FAST */
3481
3482
tls_connection_get_failed(void * ssl_ctx,struct tls_connection * conn)3483 int tls_connection_get_failed(void *ssl_ctx, struct tls_connection *conn)
3484 {
3485 if (conn == NULL)
3486 return -1;
3487 return conn->failed;
3488 }
3489
3490
tls_connection_get_read_alerts(void * ssl_ctx,struct tls_connection * conn)3491 int tls_connection_get_read_alerts(void *ssl_ctx, struct tls_connection *conn)
3492 {
3493 if (conn == NULL)
3494 return -1;
3495 return conn->read_alerts;
3496 }
3497
3498
tls_connection_get_write_alerts(void * ssl_ctx,struct tls_connection * conn)3499 int tls_connection_get_write_alerts(void *ssl_ctx, struct tls_connection *conn)
3500 {
3501 if (conn == NULL)
3502 return -1;
3503 return conn->write_alerts;
3504 }
3505
3506
3507 #ifdef HAVE_OCSP
3508
ocsp_debug_print_resp(OCSP_RESPONSE * rsp)3509 static void ocsp_debug_print_resp(OCSP_RESPONSE *rsp)
3510 {
3511 #ifndef CONFIG_NO_STDOUT_DEBUG
3512 BIO *out;
3513 size_t rlen;
3514 char *txt;
3515 int res;
3516
3517 if (wpa_debug_level > MSG_DEBUG)
3518 return;
3519
3520 out = BIO_new(BIO_s_mem());
3521 if (!out)
3522 return;
3523
3524 OCSP_RESPONSE_print(out, rsp, 0);
3525 rlen = BIO_ctrl_pending(out);
3526 txt = os_malloc(rlen + 1);
3527 if (!txt) {
3528 BIO_free(out);
3529 return;
3530 }
3531
3532 res = BIO_read(out, txt, rlen);
3533 if (res > 0) {
3534 txt[res] = '\0';
3535 wpa_printf(MSG_DEBUG, "OpenSSL: OCSP Response\n%s", txt);
3536 }
3537 os_free(txt);
3538 BIO_free(out);
3539 #endif /* CONFIG_NO_STDOUT_DEBUG */
3540 }
3541
3542
debug_print_cert(X509 * cert,const char * title)3543 static void debug_print_cert(X509 *cert, const char *title)
3544 {
3545 #ifndef CONFIG_NO_STDOUT_DEBUG
3546 BIO *out;
3547 size_t rlen;
3548 char *txt;
3549 int res;
3550
3551 if (wpa_debug_level > MSG_DEBUG)
3552 return;
3553
3554 out = BIO_new(BIO_s_mem());
3555 if (!out)
3556 return;
3557
3558 X509_print(out, cert);
3559 rlen = BIO_ctrl_pending(out);
3560 txt = os_malloc(rlen + 1);
3561 if (!txt) {
3562 BIO_free(out);
3563 return;
3564 }
3565
3566 res = BIO_read(out, txt, rlen);
3567 if (res > 0) {
3568 txt[res] = '\0';
3569 wpa_printf(MSG_DEBUG, "OpenSSL: %s\n%s", title, txt);
3570 }
3571 os_free(txt);
3572
3573 BIO_free(out);
3574 #endif /* CONFIG_NO_STDOUT_DEBUG */
3575 }
3576
3577
ocsp_resp_cb(SSL * s,void * arg)3578 static int ocsp_resp_cb(SSL *s, void *arg)
3579 {
3580 struct tls_connection *conn = arg;
3581 const unsigned char *p;
3582 int len, status, reason;
3583 OCSP_RESPONSE *rsp;
3584 OCSP_BASICRESP *basic;
3585 OCSP_CERTID *id;
3586 ASN1_GENERALIZEDTIME *produced_at, *this_update, *next_update;
3587 X509_STORE *store;
3588 STACK_OF(X509) *certs = NULL;
3589
3590 len = SSL_get_tlsext_status_ocsp_resp(s, &p);
3591 if (!p) {
3592 wpa_printf(MSG_DEBUG, "OpenSSL: No OCSP response received");
3593 return (conn->flags & TLS_CONN_REQUIRE_OCSP) ? 0 : 1;
3594 }
3595
3596 wpa_hexdump(MSG_DEBUG, "OpenSSL: OCSP response", p, len);
3597
3598 rsp = d2i_OCSP_RESPONSE(NULL, &p, len);
3599 if (!rsp) {
3600 wpa_printf(MSG_INFO, "OpenSSL: Failed to parse OCSP response");
3601 return 0;
3602 }
3603
3604 ocsp_debug_print_resp(rsp);
3605
3606 status = OCSP_response_status(rsp);
3607 if (status != OCSP_RESPONSE_STATUS_SUCCESSFUL) {
3608 wpa_printf(MSG_INFO, "OpenSSL: OCSP responder error %d (%s)",
3609 status, OCSP_response_status_str(status));
3610 return 0;
3611 }
3612
3613 basic = OCSP_response_get1_basic(rsp);
3614 if (!basic) {
3615 wpa_printf(MSG_INFO, "OpenSSL: Could not find BasicOCSPResponse");
3616 return 0;
3617 }
3618
3619 store = SSL_CTX_get_cert_store(conn->ssl_ctx);
3620 if (conn->peer_issuer) {
3621 debug_print_cert(conn->peer_issuer, "Add OCSP issuer");
3622
3623 if (X509_STORE_add_cert(store, conn->peer_issuer) != 1) {
3624 tls_show_errors(MSG_INFO, __func__,
3625 "OpenSSL: Could not add issuer to certificate store");
3626 }
3627 certs = sk_X509_new_null();
3628 if (certs) {
3629 X509 *cert;
3630 cert = X509_dup(conn->peer_issuer);
3631 if (cert && !sk_X509_push(certs, cert)) {
3632 tls_show_errors(
3633 MSG_INFO, __func__,
3634 "OpenSSL: Could not add issuer to OCSP responder trust store");
3635 X509_free(cert);
3636 sk_X509_free(certs);
3637 certs = NULL;
3638 }
3639 if (certs && conn->peer_issuer_issuer) {
3640 cert = X509_dup(conn->peer_issuer_issuer);
3641 if (cert && !sk_X509_push(certs, cert)) {
3642 tls_show_errors(
3643 MSG_INFO, __func__,
3644 "OpenSSL: Could not add issuer's issuer to OCSP responder trust store");
3645 X509_free(cert);
3646 }
3647 }
3648 }
3649 }
3650
3651 status = OCSP_basic_verify(basic, certs, store, OCSP_TRUSTOTHER);
3652 sk_X509_pop_free(certs, X509_free);
3653 if (status <= 0) {
3654 tls_show_errors(MSG_INFO, __func__,
3655 "OpenSSL: OCSP response failed verification");
3656 OCSP_BASICRESP_free(basic);
3657 OCSP_RESPONSE_free(rsp);
3658 return 0;
3659 }
3660
3661 wpa_printf(MSG_DEBUG, "OpenSSL: OCSP response verification succeeded");
3662
3663 if (!conn->peer_cert) {
3664 wpa_printf(MSG_DEBUG, "OpenSSL: Peer certificate not available for OCSP status check");
3665 OCSP_BASICRESP_free(basic);
3666 OCSP_RESPONSE_free(rsp);
3667 return 0;
3668 }
3669
3670 if (!conn->peer_issuer) {
3671 wpa_printf(MSG_DEBUG, "OpenSSL: Peer issuer certificate not available for OCSP status check");
3672 OCSP_BASICRESP_free(basic);
3673 OCSP_RESPONSE_free(rsp);
3674 return 0;
3675 }
3676
3677 id = OCSP_cert_to_id(NULL, conn->peer_cert, conn->peer_issuer);
3678 if (!id) {
3679 wpa_printf(MSG_DEBUG, "OpenSSL: Could not create OCSP certificate identifier");
3680 OCSP_BASICRESP_free(basic);
3681 OCSP_RESPONSE_free(rsp);
3682 return 0;
3683 }
3684
3685 if (!OCSP_resp_find_status(basic, id, &status, &reason, &produced_at,
3686 &this_update, &next_update)) {
3687 wpa_printf(MSG_INFO, "OpenSSL: Could not find current server certificate from OCSP response%s",
3688 (conn->flags & TLS_CONN_REQUIRE_OCSP) ? "" :
3689 " (OCSP not required)");
3690 OCSP_BASICRESP_free(basic);
3691 OCSP_RESPONSE_free(rsp);
3692 return (conn->flags & TLS_CONN_REQUIRE_OCSP) ? 0 : 1;
3693 }
3694
3695 if (!OCSP_check_validity(this_update, next_update, 5 * 60, -1)) {
3696 tls_show_errors(MSG_INFO, __func__,
3697 "OpenSSL: OCSP status times invalid");
3698 OCSP_BASICRESP_free(basic);
3699 OCSP_RESPONSE_free(rsp);
3700 return 0;
3701 }
3702
3703 OCSP_BASICRESP_free(basic);
3704 OCSP_RESPONSE_free(rsp);
3705
3706 wpa_printf(MSG_DEBUG, "OpenSSL: OCSP status for server certificate: %s",
3707 OCSP_cert_status_str(status));
3708
3709 if (status == V_OCSP_CERTSTATUS_GOOD)
3710 return 1;
3711 if (status == V_OCSP_CERTSTATUS_REVOKED)
3712 return 0;
3713 if (conn->flags & TLS_CONN_REQUIRE_OCSP) {
3714 wpa_printf(MSG_DEBUG, "OpenSSL: OCSP status unknown, but OCSP required");
3715 return 0;
3716 }
3717 wpa_printf(MSG_DEBUG, "OpenSSL: OCSP status unknown, but OCSP was not required, so allow connection to continue");
3718 return 1;
3719 }
3720
3721
ocsp_status_cb(SSL * s,void * arg)3722 static int ocsp_status_cb(SSL *s, void *arg)
3723 {
3724 char *tmp;
3725 char *resp;
3726 size_t len;
3727
3728 if (tls_global->ocsp_stapling_response == NULL) {
3729 wpa_printf(MSG_DEBUG, "OpenSSL: OCSP status callback - no response configured");
3730 return SSL_TLSEXT_ERR_OK;
3731 }
3732
3733 resp = os_readfile(tls_global->ocsp_stapling_response, &len);
3734 if (resp == NULL) {
3735 wpa_printf(MSG_DEBUG, "OpenSSL: OCSP status callback - could not read response file");
3736 /* TODO: Build OCSPResponse with responseStatus = internalError
3737 */
3738 return SSL_TLSEXT_ERR_OK;
3739 }
3740 wpa_printf(MSG_DEBUG, "OpenSSL: OCSP status callback - send cached response");
3741 tmp = OPENSSL_malloc(len);
3742 if (tmp == NULL) {
3743 os_free(resp);
3744 return SSL_TLSEXT_ERR_ALERT_FATAL;
3745 }
3746
3747 os_memcpy(tmp, resp, len);
3748 os_free(resp);
3749 SSL_set_tlsext_status_ocsp_resp(s, tmp, len);
3750
3751 return SSL_TLSEXT_ERR_OK;
3752 }
3753
3754 #endif /* HAVE_OCSP */
3755
3756
tls_connection_set_params(void * tls_ctx,struct tls_connection * conn,const struct tls_connection_params * params)3757 int tls_connection_set_params(void *tls_ctx, struct tls_connection *conn,
3758 const struct tls_connection_params *params)
3759 {
3760 struct tls_data *data = tls_ctx;
3761 int ret;
3762 unsigned long err;
3763 int can_pkcs11 = 0;
3764 const char *key_id = params->key_id;
3765 const char *cert_id = params->cert_id;
3766 const char *ca_cert_id = params->ca_cert_id;
3767 const char *engine_id = params->engine ? params->engine_id : NULL;
3768
3769 if (conn == NULL)
3770 return -1;
3771
3772 /*
3773 * If the engine isn't explicitly configured, and any of the
3774 * cert/key fields are actually PKCS#11 URIs, then automatically
3775 * use the PKCS#11 ENGINE.
3776 */
3777 if (!engine_id || os_strcmp(engine_id, "pkcs11") == 0)
3778 can_pkcs11 = 1;
3779
3780 if (!key_id && params->private_key && can_pkcs11 &&
3781 os_strncmp(params->private_key, "pkcs11:", 7) == 0) {
3782 can_pkcs11 = 2;
3783 key_id = params->private_key;
3784 }
3785
3786 if (!cert_id && params->client_cert && can_pkcs11 &&
3787 os_strncmp(params->client_cert, "pkcs11:", 7) == 0) {
3788 can_pkcs11 = 2;
3789 cert_id = params->client_cert;
3790 }
3791
3792 if (!ca_cert_id && params->ca_cert && can_pkcs11 &&
3793 os_strncmp(params->ca_cert, "pkcs11:", 7) == 0) {
3794 can_pkcs11 = 2;
3795 ca_cert_id = params->ca_cert;
3796 }
3797
3798 /* If we need to automatically enable the PKCS#11 ENGINE, do so. */
3799 if (can_pkcs11 == 2 && !engine_id)
3800 engine_id = "pkcs11";
3801
3802 #if defined(EAP_FAST) || defined(EAP_FAST_DYNAMIC) || defined(EAP_SERVER_FAST)
3803 #if OPENSSL_VERSION_NUMBER < 0x10100000L
3804 if (params->flags & TLS_CONN_EAP_FAST) {
3805 wpa_printf(MSG_DEBUG,
3806 "OpenSSL: Use TLSv1_method() for EAP-FAST");
3807 if (SSL_set_ssl_method(conn->ssl, TLSv1_method()) != 1) {
3808 tls_show_errors(MSG_INFO, __func__,
3809 "Failed to set TLSv1_method() for EAP-FAST");
3810 return -1;
3811 }
3812 }
3813 #endif
3814 #endif /* EAP_FAST || EAP_FAST_DYNAMIC || EAP_SERVER_FAST */
3815
3816 while ((err = ERR_get_error())) {
3817 wpa_printf(MSG_INFO, "%s: Clearing pending SSL error: %s",
3818 __func__, ERR_error_string(err, NULL));
3819 }
3820
3821 if (engine_id) {
3822 wpa_printf(MSG_DEBUG, "SSL: Initializing TLS engine");
3823 ret = tls_engine_init(conn, engine_id, params->pin,
3824 key_id, cert_id, ca_cert_id);
3825 if (ret)
3826 return ret;
3827 }
3828 if (tls_connection_set_subject_match(conn,
3829 params->subject_match,
3830 params->altsubject_match,
3831 params->suffix_match,
3832 params->domain_match))
3833 return -1;
3834
3835 if (engine_id && ca_cert_id) {
3836 if (tls_connection_engine_ca_cert(data, conn, ca_cert_id))
3837 return TLS_SET_PARAMS_ENGINE_PRV_VERIFY_FAILED;
3838 } else if (tls_connection_ca_cert(data, conn, params->ca_cert,
3839 params->ca_cert_blob,
3840 params->ca_cert_blob_len,
3841 params->ca_path))
3842 return -1;
3843
3844 if (engine_id && cert_id) {
3845 if (tls_connection_engine_client_cert(conn, cert_id))
3846 return TLS_SET_PARAMS_ENGINE_PRV_VERIFY_FAILED;
3847 } else if (tls_connection_client_cert(conn, params->client_cert,
3848 params->client_cert_blob,
3849 params->client_cert_blob_len))
3850 return -1;
3851
3852 if (engine_id && key_id) {
3853 wpa_printf(MSG_DEBUG, "TLS: Using private key from engine");
3854 if (tls_connection_engine_private_key(conn))
3855 return TLS_SET_PARAMS_ENGINE_PRV_VERIFY_FAILED;
3856 } else if (tls_connection_private_key(data, conn,
3857 params->private_key,
3858 params->private_key_passwd,
3859 params->private_key_blob,
3860 params->private_key_blob_len)) {
3861 wpa_printf(MSG_INFO, "TLS: Failed to load private key '%s'",
3862 params->private_key);
3863 return -1;
3864 }
3865
3866 if (tls_connection_dh(conn, params->dh_file)) {
3867 wpa_printf(MSG_INFO, "TLS: Failed to load DH file '%s'",
3868 params->dh_file);
3869 return -1;
3870 }
3871
3872 if (params->openssl_ciphers &&
3873 SSL_set_cipher_list(conn->ssl, params->openssl_ciphers) != 1) {
3874 wpa_printf(MSG_INFO,
3875 "OpenSSL: Failed to set cipher string '%s'",
3876 params->openssl_ciphers);
3877 return -1;
3878 }
3879
3880 tls_set_conn_flags(conn->ssl, params->flags);
3881
3882 #ifdef HAVE_OCSP
3883 if (params->flags & TLS_CONN_REQUEST_OCSP) {
3884 SSL_CTX *ssl_ctx = data->ssl;
3885 SSL_set_tlsext_status_type(conn->ssl, TLSEXT_STATUSTYPE_ocsp);
3886 SSL_CTX_set_tlsext_status_cb(ssl_ctx, ocsp_resp_cb);
3887 SSL_CTX_set_tlsext_status_arg(ssl_ctx, conn);
3888 }
3889 #else /* HAVE_OCSP */
3890 if (params->flags & TLS_CONN_REQUIRE_OCSP) {
3891 wpa_printf(MSG_INFO,
3892 "OpenSSL: No OCSP support included - reject configuration");
3893 return -1;
3894 }
3895 if (params->flags & TLS_CONN_REQUEST_OCSP) {
3896 wpa_printf(MSG_DEBUG,
3897 "OpenSSL: No OCSP support included - allow optional OCSP case to continue");
3898 }
3899 #endif /* HAVE_OCSP */
3900
3901 conn->flags = params->flags;
3902
3903 tls_get_errors(data);
3904
3905 return 0;
3906 }
3907
3908
tls_global_set_params(void * tls_ctx,const struct tls_connection_params * params)3909 int tls_global_set_params(void *tls_ctx,
3910 const struct tls_connection_params *params)
3911 {
3912 struct tls_data *data = tls_ctx;
3913 SSL_CTX *ssl_ctx = data->ssl;
3914 unsigned long err;
3915
3916 while ((err = ERR_get_error())) {
3917 wpa_printf(MSG_INFO, "%s: Clearing pending SSL error: %s",
3918 __func__, ERR_error_string(err, NULL));
3919 }
3920
3921 if (tls_global_ca_cert(data, params->ca_cert) ||
3922 tls_global_client_cert(data, params->client_cert) ||
3923 tls_global_private_key(data, params->private_key,
3924 params->private_key_passwd) ||
3925 tls_global_dh(data, params->dh_file)) {
3926 wpa_printf(MSG_INFO, "TLS: Failed to set global parameters");
3927 return -1;
3928 }
3929
3930 if (params->openssl_ciphers &&
3931 SSL_CTX_set_cipher_list(ssl_ctx, params->openssl_ciphers) != 1) {
3932 wpa_printf(MSG_INFO,
3933 "OpenSSL: Failed to set cipher string '%s'",
3934 params->openssl_ciphers);
3935 return -1;
3936 }
3937
3938 #ifdef SSL_OP_NO_TICKET
3939 if (params->flags & TLS_CONN_DISABLE_SESSION_TICKET)
3940 SSL_CTX_set_options(ssl_ctx, SSL_OP_NO_TICKET);
3941 #ifdef SSL_CTX_clear_options
3942 else
3943 SSL_CTX_clear_options(ssl_ctx, SSL_OP_NO_TICKET);
3944 #endif /* SSL_clear_options */
3945 #endif /* SSL_OP_NO_TICKET */
3946
3947 #ifdef HAVE_OCSP
3948 SSL_CTX_set_tlsext_status_cb(ssl_ctx, ocsp_status_cb);
3949 SSL_CTX_set_tlsext_status_arg(ssl_ctx, ssl_ctx);
3950 os_free(tls_global->ocsp_stapling_response);
3951 if (params->ocsp_stapling_response)
3952 tls_global->ocsp_stapling_response =
3953 os_strdup(params->ocsp_stapling_response);
3954 else
3955 tls_global->ocsp_stapling_response = NULL;
3956 #endif /* HAVE_OCSP */
3957
3958 return 0;
3959 }
3960
3961
3962 #if defined(EAP_FAST) || defined(EAP_FAST_DYNAMIC) || defined(EAP_SERVER_FAST)
3963 /* Pre-shared secred requires a patch to openssl, so this function is
3964 * commented out unless explicitly needed for EAP-FAST in order to be able to
3965 * build this file with unmodified openssl. */
3966
3967 #ifdef OPENSSL_IS_BORINGSSL
tls_sess_sec_cb(SSL * s,void * secret,int * secret_len,STACK_OF (SSL_CIPHER)* peer_ciphers,const SSL_CIPHER ** cipher,void * arg)3968 static int tls_sess_sec_cb(SSL *s, void *secret, int *secret_len,
3969 STACK_OF(SSL_CIPHER) *peer_ciphers,
3970 const SSL_CIPHER **cipher, void *arg)
3971 #else /* OPENSSL_IS_BORINGSSL */
3972 static int tls_sess_sec_cb(SSL *s, void *secret, int *secret_len,
3973 STACK_OF(SSL_CIPHER) *peer_ciphers,
3974 SSL_CIPHER **cipher, void *arg)
3975 #endif /* OPENSSL_IS_BORINGSSL */
3976 {
3977 struct tls_connection *conn = arg;
3978 int ret;
3979
3980 #if OPENSSL_VERSION_NUMBER < 0x10100000L
3981 if (conn == NULL || conn->session_ticket_cb == NULL)
3982 return 0;
3983
3984 ret = conn->session_ticket_cb(conn->session_ticket_cb_ctx,
3985 conn->session_ticket,
3986 conn->session_ticket_len,
3987 s->s3->client_random,
3988 s->s3->server_random, secret);
3989 #else
3990 unsigned char client_random[SSL3_RANDOM_SIZE];
3991 unsigned char server_random[SSL3_RANDOM_SIZE];
3992
3993 if (conn == NULL || conn->session_ticket_cb == NULL)
3994 return 0;
3995
3996 SSL_get_client_random(s, client_random, sizeof(client_random));
3997 SSL_get_server_random(s, server_random, sizeof(server_random));
3998
3999 ret = conn->session_ticket_cb(conn->session_ticket_cb_ctx,
4000 conn->session_ticket,
4001 conn->session_ticket_len,
4002 client_random,
4003 server_random, secret);
4004 #endif
4005
4006 os_free(conn->session_ticket);
4007 conn->session_ticket = NULL;
4008
4009 if (ret <= 0)
4010 return 0;
4011
4012 *secret_len = SSL_MAX_MASTER_KEY_LENGTH;
4013 return 1;
4014 }
4015
4016
tls_session_ticket_ext_cb(SSL * s,const unsigned char * data,int len,void * arg)4017 static int tls_session_ticket_ext_cb(SSL *s, const unsigned char *data,
4018 int len, void *arg)
4019 {
4020 struct tls_connection *conn = arg;
4021
4022 if (conn == NULL || conn->session_ticket_cb == NULL)
4023 return 0;
4024
4025 wpa_printf(MSG_DEBUG, "OpenSSL: %s: length=%d", __func__, len);
4026
4027 os_free(conn->session_ticket);
4028 conn->session_ticket = NULL;
4029
4030 wpa_hexdump(MSG_DEBUG, "OpenSSL: ClientHello SessionTicket "
4031 "extension", data, len);
4032
4033 conn->session_ticket = os_malloc(len);
4034 if (conn->session_ticket == NULL)
4035 return 0;
4036
4037 os_memcpy(conn->session_ticket, data, len);
4038 conn->session_ticket_len = len;
4039
4040 return 1;
4041 }
4042 #endif /* EAP_FAST || EAP_FAST_DYNAMIC || EAP_SERVER_FAST */
4043
4044
tls_connection_set_session_ticket_cb(void * tls_ctx,struct tls_connection * conn,tls_session_ticket_cb cb,void * ctx)4045 int tls_connection_set_session_ticket_cb(void *tls_ctx,
4046 struct tls_connection *conn,
4047 tls_session_ticket_cb cb,
4048 void *ctx)
4049 {
4050 #if defined(EAP_FAST) || defined(EAP_FAST_DYNAMIC) || defined(EAP_SERVER_FAST)
4051 conn->session_ticket_cb = cb;
4052 conn->session_ticket_cb_ctx = ctx;
4053
4054 if (cb) {
4055 if (SSL_set_session_secret_cb(conn->ssl, tls_sess_sec_cb,
4056 conn) != 1)
4057 return -1;
4058 SSL_set_session_ticket_ext_cb(conn->ssl,
4059 tls_session_ticket_ext_cb, conn);
4060 } else {
4061 if (SSL_set_session_secret_cb(conn->ssl, NULL, NULL) != 1)
4062 return -1;
4063 SSL_set_session_ticket_ext_cb(conn->ssl, NULL, NULL);
4064 }
4065
4066 return 0;
4067 #else /* EAP_FAST || EAP_FAST_DYNAMIC || EAP_SERVER_FAST */
4068 return -1;
4069 #endif /* EAP_FAST || EAP_FAST_DYNAMIC || EAP_SERVER_FAST */
4070 }
4071
4072
tls_get_library_version(char * buf,size_t buf_len)4073 int tls_get_library_version(char *buf, size_t buf_len)
4074 {
4075 return os_snprintf(buf, buf_len, "OpenSSL build=%s run=%s",
4076 OPENSSL_VERSION_TEXT,
4077 SSLeay_version(SSLEAY_VERSION));
4078 }
4079
4080
tls_connection_set_success_data(struct tls_connection * conn,struct wpabuf * data)4081 void tls_connection_set_success_data(struct tls_connection *conn,
4082 struct wpabuf *data)
4083 {
4084 SSL_SESSION *sess;
4085 struct wpabuf *old;
4086
4087 if (tls_ex_idx_session < 0)
4088 goto fail;
4089 sess = SSL_get_session(conn->ssl);
4090 if (!sess)
4091 goto fail;
4092 old = SSL_SESSION_get_ex_data(sess, tls_ex_idx_session);
4093 if (old) {
4094 wpa_printf(MSG_DEBUG, "OpenSSL: Replacing old success data %p",
4095 old);
4096 wpabuf_free(old);
4097 }
4098 if (SSL_SESSION_set_ex_data(sess, tls_ex_idx_session, data) != 1)
4099 goto fail;
4100
4101 wpa_printf(MSG_DEBUG, "OpenSSL: Stored success data %p", data);
4102 conn->success_data = 1;
4103 return;
4104
4105 fail:
4106 wpa_printf(MSG_INFO, "OpenSSL: Failed to store success data");
4107 wpabuf_free(data);
4108 }
4109
4110
tls_connection_set_success_data_resumed(struct tls_connection * conn)4111 void tls_connection_set_success_data_resumed(struct tls_connection *conn)
4112 {
4113 wpa_printf(MSG_DEBUG,
4114 "OpenSSL: Success data accepted for resumed session");
4115 conn->success_data = 1;
4116 }
4117
4118
4119 const struct wpabuf *
tls_connection_get_success_data(struct tls_connection * conn)4120 tls_connection_get_success_data(struct tls_connection *conn)
4121 {
4122 SSL_SESSION *sess;
4123
4124 if (tls_ex_idx_session < 0 ||
4125 !(sess = SSL_get_session(conn->ssl)))
4126 return NULL;
4127 return SSL_SESSION_get_ex_data(sess, tls_ex_idx_session);
4128 }
4129
4130
tls_connection_remove_session(struct tls_connection * conn)4131 void tls_connection_remove_session(struct tls_connection *conn)
4132 {
4133 SSL_SESSION *sess;
4134
4135 sess = SSL_get_session(conn->ssl);
4136 if (!sess)
4137 return;
4138
4139 if (SSL_CTX_remove_session(conn->ssl_ctx, sess) != 1)
4140 wpa_printf(MSG_DEBUG,
4141 "OpenSSL: Session was not cached");
4142 else
4143 wpa_printf(MSG_DEBUG,
4144 "OpenSSL: Removed cached session to disable session resumption");
4145 }
4146