1 /* Copyright (c) 2003, Roger Dingledine.
2 * Copyright (c) 2004-2006, Roger Dingledine, Nick Mathewson.
3 * Copyright (c) 2007-2008, The Tor Project, Inc. */
4 /* See LICENSE for licensing information */
6 const char tortls_c_id
[] =
11 * \brief Wrapper functions to present a consistent interface to
12 * TLS, SSL, and X.509 functions from OpenSSL.
15 /* (Unlike other tor functions, these
16 * are prefixed with tor_ in order to avoid conflicting with OpenSSL
17 * functions and variables.)
23 #include <openssl/ssl.h>
24 #include <openssl/ssl3.h>
25 #include <openssl/err.h>
26 #include <openssl/tls1.h>
27 #include <openssl/asn1.h>
28 #include <openssl/bio.h>
29 #include <openssl/opensslv.h>
31 #if OPENSSL_VERSION_NUMBER < 0x00907000l
32 #error "We require openssl >= 0.9.7"
35 #define CRYPTO_PRIVATE /* to import prototypes from crypto.h */
41 #include "container.h"
45 /* Enable the "v2" TLS handshake.
47 #define V2_HANDSHAKE_SERVER
48 #define V2_HANDSHAKE_CLIENT
50 /* Copied from or.h */
51 #define LEGAL_NICKNAME_CHARACTERS \
52 "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789"
54 /** How long do identity certificates live? (sec) */
55 #define IDENTITY_CERT_LIFETIME (365*24*60*60)
57 #define ADDR(tls) (((tls) && (tls)->address) ? tls->address : "peer")
59 /** Structure holding the TLS state for a single connection. */
60 typedef struct tor_tls_context_t
{
68 /** Holds a SSL object and its associated data. Members are only
69 * accessed from within tortls.c.
72 HT_ENTRY(tor_tls_t
) node
;
73 tor_tls_context_t
*context
; /** A link to the context object for this tls */
74 SSL
*ssl
; /**< An OpenSSL SSL object. */
75 int socket
; /**< The underlying file descriptor for this TLS connection. */
76 char *address
; /**< An address to log when describing this connectinon. */
78 TOR_TLS_ST_HANDSHAKE
, TOR_TLS_ST_OPEN
, TOR_TLS_ST_GOTCLOSE
,
79 TOR_TLS_ST_SENTCLOSE
, TOR_TLS_ST_CLOSED
, TOR_TLS_ST_RENEGOTIATE
,
80 } state
: 3; /**< The current SSL state, depending on which operations have
81 * completed successfully. */
82 unsigned int isServer
:1; /**< True iff this is a server-side connection */
83 unsigned int wasV2Handshake
:1; /**< True iff the original handshake for
84 * this connection used the updated version
85 * of the connection protocol (client sends
86 * different cipher list, server sends only
87 * one certificate). */
88 /** True iff we should call negotiated_callback when we're done reading. */
89 unsigned int got_renegotiate
:1;
90 size_t wantwrite_n
; /**< 0 normally, >0 if we returned wantwrite last
92 /** Last values retrieved from BIO_number_read()/write(); see
93 * tor_tls_get_n_raw_bytes() for usage.
95 unsigned long last_write_count
;
96 unsigned long last_read_count
;
97 /** If set, a callback to invoke whenever the client tries to renegotiate
99 void (*negotiated_callback
)(tor_tls_t
*tls
, void *arg
);
100 /** Argument to pass to negotiated_callback. */
104 /** Helper: compare tor_tls_t objects by its SSL. */
106 tor_tls_entries_eq(const tor_tls_t
*a
, const tor_tls_t
*b
)
108 return a
->ssl
== b
->ssl
;
111 /** Helper: return a hash value for a tor_tls_t by its SSL. */
112 static INLINE
unsigned int
113 tor_tls_entry_hash(const tor_tls_t
*a
)
115 #if SIZEOF_INT == SIZEOF_VOID_P
116 return ((unsigned int)(uintptr_t)a
->ssl
);
118 return (unsigned int) ((((uint64_t)a
->ssl
)>>2) & UINT_MAX
);
122 /** Map from SSL* pointers to tor_tls_t objects using those pointers.
124 static HT_HEAD(tlsmap
, tor_tls_t
) tlsmap_root
= HT_INITIALIZER();
126 HT_PROTOTYPE(tlsmap
, tor_tls_t
, node
, tor_tls_entry_hash
,
128 HT_GENERATE(tlsmap
, tor_tls_t
, node
, tor_tls_entry_hash
,
129 tor_tls_entries_eq
, 0.6, malloc
, realloc
, free
)
131 /** Helper: given a SSL* pointer, return the tor_tls_t object using that
133 static INLINE tor_tls_t
*
134 tor_tls_get_by_ssl(const SSL
*ssl
)
136 tor_tls_t search
, *result
;
137 memset(&search
, 0, sizeof(search
));
138 search
.ssl
= (SSL
*)ssl
;
139 result
= HT_FIND(tlsmap
, &tlsmap_root
, &search
);
143 static void tor_tls_context_decref(tor_tls_context_t
*ctx
);
144 static void tor_tls_context_incref(tor_tls_context_t
*ctx
);
145 static X509
* tor_tls_create_certificate(crypto_pk_env_t
*rsa
,
146 crypto_pk_env_t
*rsa_sign
,
148 const char *cname_sign
,
149 unsigned int lifetime
);
151 /** Global tls context. We keep it here because nobody else needs to
153 static tor_tls_context_t
*global_tls_context
= NULL
;
154 /** True iff tor_tls_init() has been called. */
155 static int tls_library_is_initialized
= 0;
157 /* Module-internal error codes. */
158 #define _TOR_TLS_SYSCALL (_MIN_TOR_TLS_ERROR_VAL - 2)
159 #define _TOR_TLS_ZERORETURN (_MIN_TOR_TLS_ERROR_VAL - 1)
161 /** Log all pending tls errors at level <b>severity</b>. Use
162 * <b>doing</b> to describe our current activities.
165 tls_log_errors(tor_tls_t
*tls
, int severity
, const char *doing
)
168 const char *msg
, *lib
, *func
, *addr
;
169 addr
= tls
? tls
->address
: NULL
;
170 while ((err
= ERR_get_error()) != 0) {
171 msg
= (const char*)ERR_reason_error_string(err
);
172 lib
= (const char*)ERR_lib_error_string(err
);
173 func
= (const char*)ERR_func_error_string(err
);
174 if (!msg
) msg
= "(null)";
176 log(severity
, LD_NET
, "TLS error while %s%s%s: %s (in %s:%s)",
177 doing
, addr
?" with ":"", addr
?addr
:"",
180 log(severity
, LD_NET
, "TLS error%s%s: %s (in %s:%s)",
181 addr
?" with ":"", addr
?addr
:"",
187 /** Convert an errno (or a WSAerrno on windows) into a TOR_TLS_* error
190 tor_errno_to_tls_error(int e
)
192 #if defined(MS_WINDOWS) && !defined(USE_BSOCKETS)
194 case WSAECONNRESET
: // most common
195 return TOR_TLS_ERROR_CONNRESET
;
197 return TOR_TLS_ERROR_TIMEOUT
;
199 case WSAEHOSTUNREACH
:
200 return TOR_TLS_ERROR_NO_ROUTE
;
201 case WSAECONNREFUSED
:
202 return TOR_TLS_ERROR_CONNREFUSED
; // least common
204 return TOR_TLS_ERROR_MISC
;
208 case ECONNRESET
: // most common
209 return TOR_TLS_ERROR_CONNRESET
;
211 return TOR_TLS_ERROR_TIMEOUT
;
214 return TOR_TLS_ERROR_NO_ROUTE
;
216 return TOR_TLS_ERROR_CONNREFUSED
; // least common
218 return TOR_TLS_ERROR_MISC
;
223 /** Given a TOR_TLS_* error code, return a string equivalent. */
225 tor_tls_err_to_string(int err
)
228 return "[Not an error.]";
230 case TOR_TLS_ERROR_MISC
: return "misc error";
231 case TOR_TLS_ERROR_IO
: return "unexpected close";
232 case TOR_TLS_ERROR_CONNREFUSED
: return "connection refused";
233 case TOR_TLS_ERROR_CONNRESET
: return "connection reset";
234 case TOR_TLS_ERROR_NO_ROUTE
: return "host unreachable";
235 case TOR_TLS_ERROR_TIMEOUT
: return "connection timed out";
236 case TOR_TLS_CLOSE
: return "closed";
237 case TOR_TLS_WANTREAD
: return "want to read";
238 case TOR_TLS_WANTWRITE
: return "want to write";
239 default: return "(unknown error code)";
243 #define CATCH_SYSCALL 1
246 /** Given a TLS object and the result of an SSL_* call, use
247 * SSL_get_error to determine whether an error has occurred, and if so
248 * which one. Return one of TOR_TLS_{DONE|WANTREAD|WANTWRITE|ERROR}.
249 * If extra&CATCH_SYSCALL is true, return _TOR_TLS_SYSCALL instead of
250 * reporting syscall errors. If extra&CATCH_ZERO is true, return
251 * _TOR_TLS_ZERORETURN instead of reporting zero-return errors.
253 * If an error has occurred, log it at level <b>severity</b> and describe the
254 * current action as <b>doing</b>.
257 tor_tls_get_error(tor_tls_t
*tls
, int r
, int extra
,
258 const char *doing
, int severity
)
260 int err
= SSL_get_error(tls
->ssl
, r
);
261 int tor_error
= TOR_TLS_ERROR_MISC
;
265 case SSL_ERROR_WANT_READ
:
266 return TOR_TLS_WANTREAD
;
267 case SSL_ERROR_WANT_WRITE
:
268 return TOR_TLS_WANTWRITE
;
269 case SSL_ERROR_SYSCALL
:
270 if (extra
&CATCH_SYSCALL
)
271 return _TOR_TLS_SYSCALL
;
273 log(severity
, LD_NET
, "TLS error: unexpected close while %s", doing
);
274 tor_error
= TOR_TLS_ERROR_IO
;
276 int e
= tor_socket_errno(tls
->socket
);
277 log(severity
, LD_NET
,
278 "TLS error: <syscall error while %s> (errno=%d: %s)",
279 doing
, e
, tor_socket_strerror(e
));
280 tor_error
= tor_errno_to_tls_error(e
);
282 tls_log_errors(tls
, severity
, doing
);
284 case SSL_ERROR_ZERO_RETURN
:
285 if (extra
&CATCH_ZERO
)
286 return _TOR_TLS_ZERORETURN
;
287 log(severity
, LD_NET
, "TLS connection closed while %s", doing
);
288 tls_log_errors(tls
, severity
, doing
);
289 return TOR_TLS_CLOSE
;
291 tls_log_errors(tls
, severity
, doing
);
292 return TOR_TLS_ERROR_MISC
;
296 /** Initialize OpenSSL, unless it has already been initialized.
301 if (!tls_library_is_initialized
) {
303 SSL_load_error_strings();
304 crypto_global_init(-1);
305 tls_library_is_initialized
= 1;
309 /** Free all global TLS structures. */
311 tor_tls_free_all(void)
313 if (global_tls_context
) {
314 tor_tls_context_decref(global_tls_context
);
315 global_tls_context
= NULL
;
317 if (!HT_EMPTY(&tlsmap_root
)) {
318 log_warn(LD_MM
, "Still have entries in the tlsmap at shutdown.");
320 HT_CLEAR(tlsmap
, &tlsmap_root
);
323 /** We need to give OpenSSL a callback to verify certificates. This is
324 * it: We always accept peer certs and complete the handshake. We
325 * don't validate them until later.
328 always_accept_verify_cb(int preverify_ok
,
329 X509_STORE_CTX
*x509_ctx
)
336 /** Return a newly allocated X509 name with commonName <b>cname</b>. */
338 tor_x509_name_new(const char *cname
)
342 if (!(name
= X509_NAME_new()))
344 if ((nid
= OBJ_txt2nid("commonName")) == NID_undef
) goto error
;
345 if (!(X509_NAME_add_entry_by_NID(name
, nid
, MBSTRING_ASC
,
346 (unsigned char*)cname
, -1, -1, 0)))
350 X509_NAME_free(name
);
354 /** Generate and sign an X509 certificate with the public key <b>rsa</b>,
355 * signed by the private key <b>rsa_sign</b>. The commonName of the
356 * certificate will be <b>cname</b>; the commonName of the issuer will be
357 * <b>cname_sign</b>. The cert will be valid for <b>cert_lifetime</b> seconds
358 * starting from now. Return a certificate on success, NULL on
362 tor_tls_create_certificate(crypto_pk_env_t
*rsa
,
363 crypto_pk_env_t
*rsa_sign
,
365 const char *cname_sign
,
366 unsigned int cert_lifetime
)
368 time_t start_time
, end_time
;
369 EVP_PKEY
*sign_pkey
= NULL
, *pkey
=NULL
;
371 X509_NAME
*name
= NULL
, *name_issuer
=NULL
;
375 start_time
= time(NULL
);
379 tor_assert(rsa_sign
);
380 tor_assert(cname_sign
);
381 if (!(sign_pkey
= _crypto_pk_env_get_evp_pkey(rsa_sign
,1)))
383 if (!(pkey
= _crypto_pk_env_get_evp_pkey(rsa
,0)))
385 if (!(x509
= X509_new()))
387 if (!(X509_set_version(x509
, 2)))
389 if (!(ASN1_INTEGER_set(X509_get_serialNumber(x509
), (long)start_time
)))
392 if (!(name
= tor_x509_name_new(cname
)))
394 if (!(X509_set_subject_name(x509
, name
)))
396 if (!(name_issuer
= tor_x509_name_new(cname_sign
)))
398 if (!(X509_set_issuer_name(x509
, name_issuer
)))
401 if (!X509_time_adj(X509_get_notBefore(x509
),0,&start_time
))
403 end_time
= start_time
+ cert_lifetime
;
404 if (!X509_time_adj(X509_get_notAfter(x509
),0,&end_time
))
406 if (!X509_set_pubkey(x509
, pkey
))
408 if (!X509_sign(x509
, sign_pkey
, EVP_sha1()))
418 tls_log_errors(NULL
, LOG_WARN
, "generating certificate");
420 EVP_PKEY_free(sign_pkey
);
424 X509_NAME_free(name
);
426 X509_NAME_free(name_issuer
);
430 #define SERVER_CIPHER_LIST \
431 (TLS1_TXT_DHE_RSA_WITH_AES_256_SHA ":" \
432 TLS1_TXT_DHE_RSA_WITH_AES_128_SHA ":" \
433 SSL3_TXT_EDH_RSA_DES_192_CBC3_SHA)
434 /* Note: for setting up your own private testing network with link crypto
435 * disabled, set the cipher lists to your cipher list to
436 * SSL3_TXT_RSA_NULL_SHA. If you do this, you won't be able to communicate
437 * with any of the "real" Tors, though. */
439 #if OPENSSL_VERSION_NUMBER >= 0x00908020l
440 #define CLIENT_CIPHER_LIST \
441 (TLS1_TXT_ECDHE_ECDSA_WITH_AES_256_CBC_SHA ":" \
442 TLS1_TXT_ECDHE_RSA_WITH_AES_256_CBC_SHA ":" \
443 TLS1_TXT_DHE_RSA_WITH_AES_256_SHA ":" \
444 TLS1_TXT_DHE_DSS_WITH_AES_256_SHA ":" \
445 TLS1_TXT_ECDH_RSA_WITH_AES_256_CBC_SHA ":" \
446 TLS1_TXT_ECDH_ECDSA_WITH_AES_256_CBC_SHA ":" \
447 TLS1_TXT_RSA_WITH_AES_256_SHA ":" \
448 TLS1_TXT_ECDHE_ECDSA_WITH_RC4_128_SHA ":" \
449 TLS1_TXT_ECDHE_ECDSA_WITH_AES_128_CBC_SHA ":" \
450 TLS1_TXT_ECDHE_RSA_WITH_RC4_128_SHA ":" \
451 TLS1_TXT_ECDHE_RSA_WITH_AES_128_CBC_SHA ":" \
452 TLS1_TXT_DHE_RSA_WITH_AES_128_SHA ":" \
453 TLS1_TXT_DHE_DSS_WITH_AES_128_SHA ":" \
454 TLS1_TXT_ECDH_RSA_WITH_RC4_128_SHA":" \
455 TLS1_TXT_ECDH_RSA_WITH_AES_128_CBC_SHA":" \
456 TLS1_TXT_ECDH_ECDSA_WITH_RC4_128_SHA ":" \
457 TLS1_TXT_ECDH_ECDSA_WITH_AES_128_CBC_SHA ":" \
458 SSL3_TXT_RSA_RC4_128_MD5 ":" \
459 SSL3_TXT_RSA_RC4_128_SHA ":" \
460 TLS1_TXT_RSA_WITH_AES_128_SHA ":" \
461 TLS1_TXT_ECDHE_ECDSA_WITH_DES_192_CBC3_SHA ":" \
462 TLS1_TXT_ECDHE_RSA_WITH_DES_192_CBC3_SHA ":" \
463 SSL3_TXT_EDH_RSA_DES_192_CBC3_SHA ":" \
464 SSL3_TXT_EDH_DSS_DES_192_CBC3_SHA ":" \
465 TLS1_TXT_ECDH_RSA_WITH_DES_192_CBC3_SHA ":" \
466 TLS1_TXT_ECDH_ECDSA_WITH_DES_192_CBC3_SHA ":" \
467 /*SSL3_TXT_RSA_FIPS_WITH_3DES_EDE_CBC_SHA ":"*/ \
468 SSL3_TXT_RSA_DES_192_CBC3_SHA)
469 /* SSL3_TXT_RSA_FIPS_WITH_3DES_EDE_CBC_SHA is commented out because it doesn't
470 * really exist; if I understand correctly, it's a bit of silliness that
471 * netscape did on its own before any standard for what they wanted was
472 * formally approved. Nonetheless, Firefox still uses it, so we need to
473 * fake it at some point soon. XXXX021 -NM */
475 /* Ug. We don't have as many ciphers with openssl 0.9.7 as we'd like. Fix
476 * this list into something that sucks less. */
477 #define CLIENT_CIPHER_LIST \
478 (TLS1_TXT_DHE_RSA_WITH_AES_256_SHA ":" \
479 TLS1_TXT_DHE_RSA_WITH_AES_128_SHA ":" \
480 SSL3_TXT_EDH_RSA_DES_192_CBC3_SHA ":" \
481 SSL3_TXT_RSA_RC4_128_SHA)
484 #ifndef V2_HANDSHAKE_CLIENT
485 #undef CLIENT_CIPHER_LIST
486 #define CLIENT_CIPHER_LIST (TLS1_TXT_DHE_RSA_WITH_AES_128_SHA ":" \
487 SSL3_TXT_EDH_RSA_DES_192_CBC3_SHA)
490 /** Remove a reference to <b>ctx</b>, and free it if it has no more
493 tor_tls_context_decref(tor_tls_context_t
*ctx
)
496 if (--ctx
->refcnt
== 0) {
497 SSL_CTX_free(ctx
->ctx
);
498 X509_free(ctx
->my_cert
);
499 X509_free(ctx
->my_id_cert
);
500 crypto_free_pk_env(ctx
->key
);
505 /** Increase the reference count of <b>ctx</b>. */
507 tor_tls_context_incref(tor_tls_context_t
*ctx
)
512 /** Create a new TLS context for use with Tor TLS handshakes.
513 * <b>identity</b> should be set to the identity key used to sign the
514 * certificate, and <b>nickname</b> set to the nickname to use.
516 * You can call this function multiple times. Each time you call it,
517 * it generates new certificates; all new connections will use
518 * the new SSL context.
521 tor_tls_context_new(crypto_pk_env_t
*identity
, unsigned int key_lifetime
)
523 crypto_pk_env_t
*rsa
= NULL
;
524 crypto_dh_env_t
*dh
= NULL
;
525 EVP_PKEY
*pkey
= NULL
;
526 tor_tls_context_t
*result
= NULL
;
527 X509
*cert
= NULL
, *idcert
= NULL
;
528 char *nickname
= NULL
, *nn2
= NULL
;
531 nickname
= crypto_random_hostname(8, 20, "www.", ".net");
532 nn2
= crypto_random_hostname(8, 20, "www.", ".net");
534 /* Generate short-term RSA key. */
535 if (!(rsa
= crypto_new_pk_env()))
537 if (crypto_pk_generate_key(rsa
)<0)
539 /* Create certificate signed by identity key. */
540 cert
= tor_tls_create_certificate(rsa
, identity
, nickname
, nn2
,
542 /* Create self-signed certificate for identity key. */
543 idcert
= tor_tls_create_certificate(identity
, identity
, nn2
, nn2
,
544 IDENTITY_CERT_LIFETIME
);
545 if (!cert
|| !idcert
) {
546 log(LOG_WARN
, LD_CRYPTO
, "Error creating certificate");
550 result
= tor_malloc_zero(sizeof(tor_tls_context_t
));
552 result
->my_cert
= X509_dup(cert
);
553 result
->my_id_cert
= X509_dup(idcert
);
554 result
->key
= crypto_pk_dup_key(rsa
);
556 #ifdef EVERYONE_HAS_AES
557 /* Tell OpenSSL to only use TLS1 */
558 if (!(result
->ctx
= SSL_CTX_new(TLSv1_method())))
561 /* Tell OpenSSL to use SSL3 or TLS1 but not SSL2. */
562 if (!(result
->ctx
= SSL_CTX_new(SSLv23_method())))
564 SSL_CTX_set_options(result
->ctx
, SSL_OP_NO_SSLv2
);
566 SSL_CTX_set_options(result
->ctx
, SSL_OP_SINGLE_DH_USE
);
567 #ifdef SSL_MODE_RELEASE_BUFFERS
568 SSL_CTX_set_mode(result
->ctx
, SSL_MODE_RELEASE_BUFFERS
);
570 if (cert
&& !SSL_CTX_use_certificate(result
->ctx
,cert
))
572 X509_free(cert
); /* We just added a reference to cert. */
575 X509_STORE
*s
= SSL_CTX_get_cert_store(result
->ctx
);
577 X509_STORE_add_cert(s
, idcert
);
578 X509_free(idcert
); /* The context now owns the reference to idcert */
581 SSL_CTX_set_session_cache_mode(result
->ctx
, SSL_SESS_CACHE_OFF
);
583 if (!(pkey
= _crypto_pk_env_get_evp_pkey(rsa
,1)))
585 if (!SSL_CTX_use_PrivateKey(result
->ctx
, pkey
))
589 if (!SSL_CTX_check_private_key(result
->ctx
))
591 dh
= crypto_dh_new();
592 SSL_CTX_set_tmp_dh(result
->ctx
, _crypto_dh_env_get_dh(dh
));
594 SSL_CTX_set_verify(result
->ctx
, SSL_VERIFY_PEER
,
595 always_accept_verify_cb
);
596 /* let us realloc bufs that we're writing from */
597 SSL_CTX_set_mode(result
->ctx
, SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER
);
598 /* Free the old context if one exists. */
599 if (global_tls_context
) {
600 /* This is safe even if there are open connections: OpenSSL does
601 * reference counting with SSL and SSL_CTX objects. */
602 tor_tls_context_decref(global_tls_context
);
604 global_tls_context
= result
;
606 crypto_free_pk_env(rsa
);
612 tls_log_errors(NULL
, LOG_WARN
, "creating TLS context");
618 crypto_free_pk_env(rsa
);
622 tor_tls_context_decref(result
);
630 #ifdef V2_HANDSHAKE_SERVER
631 /** Return true iff the cipher list suggested by the client for <b>ssl</b> is
632 * a list that indicates that the client knows how to do the v2 TLS connection
635 tor_tls_client_is_using_v2_ciphers(const SSL
*ssl
, const char *address
)
638 SSL_SESSION
*session
;
639 /* If we reached this point, we just got a client hello. See if there is
641 if (!(session
= SSL_get_session((SSL
*)ssl
))) {
642 log_warn(LD_NET
, "No session on TLS?");
645 if (!session
->ciphers
) {
646 log_warn(LD_NET
, "No ciphers on session");
649 /* Now we need to see if there are any ciphers whose presence means we're
650 * dealing with an updated Tor. */
651 for (i
= 0; i
< sk_SSL_CIPHER_num(session
->ciphers
); ++i
) {
652 SSL_CIPHER
*cipher
= sk_SSL_CIPHER_value(session
->ciphers
, i
);
653 const char *ciphername
= SSL_CIPHER_get_name(cipher
);
654 if (strcmp(ciphername
, TLS1_TXT_DHE_RSA_WITH_AES_128_SHA
) &&
655 strcmp(ciphername
, TLS1_TXT_DHE_RSA_WITH_AES_256_SHA
) &&
656 strcmp(ciphername
, SSL3_TXT_EDH_RSA_DES_192_CBC3_SHA
) &&
657 strcmp(ciphername
, "(NONE)")) {
658 /* XXXX should be ld_debug */
659 log_info(LD_NET
, "Got a non-version-1 cipher called '%s'", ciphername
);
667 smartlist_t
*elts
= smartlist_create();
669 for (i
= 0; i
< sk_SSL_CIPHER_num(session
->ciphers
); ++i
) {
670 SSL_CIPHER
*cipher
= sk_SSL_CIPHER_value(session
->ciphers
, i
);
671 const char *ciphername
= SSL_CIPHER_get_name(cipher
);
672 smartlist_add(elts
, (char*)ciphername
);
674 s
= smartlist_join_strings(elts
, ":", 0, NULL
);
675 log_info(LD_NET
, "Got a non-version-1 cipher list from %s. It is: '%s'",
678 smartlist_free(elts
);
683 /** Invoked when we're accepting a connection on <b>ssl</b>, and the connection
684 * changes state. We use this:
685 * <ul><li>To alter the state of the handshake partway through, so we
686 * do not send or request extra certificates in v2 handshakes.</li>
687 * <li>To detect renegotiation</li></ul>
690 tor_tls_server_info_callback(const SSL
*ssl
, int type
, int val
)
694 if (type
!= SSL_CB_ACCEPT_LOOP
)
696 if (ssl
->state
!= SSL3_ST_SW_SRVR_HELLO_A
)
699 tls
= tor_tls_get_by_ssl(ssl
);
701 /* Check whether we're watching for renegotiates. If so, this is one! */
702 if (tls
->negotiated_callback
)
703 tls
->got_renegotiate
= 1;
705 log_warn(LD_BUG
, "Couldn't look up the tls for an SSL*. How odd!");
708 /* Now check the cipher list. */
709 if (tor_tls_client_is_using_v2_ciphers(ssl
, ADDR(tls
))) {
710 /*XXXX_TLS keep this from happening more than once! */
712 /* Yes, we're casting away the const from ssl. This is very naughty of us.
713 * Let's hope openssl doesn't notice! */
715 /* Set SSL_MODE_NO_AUTO_CHAIN to keep from sending back any extra certs. */
716 SSL_set_mode((SSL
*) ssl
, SSL_MODE_NO_AUTO_CHAIN
);
717 /* Don't send a hello request. */
718 SSL_set_verify((SSL
*) ssl
, SSL_VERIFY_NONE
, NULL
);
721 tls
->wasV2Handshake
= 1;
723 log_warn(LD_BUG
, "Couldn't look up the tls for an SSL*. How odd!");
729 /** Create a new TLS object from a file descriptor, and a flag to
730 * determine whether it is functioning as a server.
733 tor_tls_new(int sock
, int isServer
)
736 tor_tls_t
*result
= tor_malloc_zero(sizeof(tor_tls_t
));
738 tor_assert(global_tls_context
); /* make sure somebody made it first */
739 if (!(result
->ssl
= SSL_new(global_tls_context
->ctx
))) {
740 tls_log_errors(NULL
, LOG_WARN
, "generating TLS context");
744 if (!SSL_set_cipher_list(result
->ssl
,
745 isServer
? SERVER_CIPHER_LIST
: CLIENT_CIPHER_LIST
)) {
746 SSL_free(result
->ssl
);
750 result
->socket
= sock
;
752 bio
= BIO_new_bsocket(sock
, BIO_NOCLOSE
);
754 bio
= BIO_new_socket(sock
, BIO_NOCLOSE
);
757 tls_log_errors(NULL
, LOG_WARN
, "opening BIO");
758 SSL_free(result
->ssl
);
762 HT_INSERT(tlsmap
, &tlsmap_root
, result
);
763 SSL_set_bio(result
->ssl
, bio
, bio
);
764 tor_tls_context_incref(global_tls_context
);
765 result
->context
= global_tls_context
;
766 result
->state
= TOR_TLS_ST_HANDSHAKE
;
767 result
->isServer
= isServer
;
768 result
->wantwrite_n
= 0;
769 result
->last_write_count
= BIO_number_written(bio
);
770 result
->last_read_count
= BIO_number_read(bio
);
771 if (result
->last_write_count
|| result
->last_read_count
) {
772 log_warn(LD_NET
, "Newly created BIO has read count %lu, write count %lu",
773 result
->last_read_count
, result
->last_write_count
);
775 #ifdef V2_HANDSHAKE_SERVER
777 SSL_set_info_callback(result
->ssl
, tor_tls_server_info_callback
);
780 /* Not expected to get called. */
781 tls_log_errors(NULL
, LOG_WARN
, "generating TLS context");
785 /** Make future log messages about <b>tls</b> display the address
789 tor_tls_set_logged_address(tor_tls_t
*tls
, const char *address
)
792 tor_free(tls
->address
);
793 tls
->address
= tor_strdup(address
);
796 /** Set <b>cb</b> to be called with argument <b>arg</b> whenever <b>tls</b>
797 * next gets a client-side renegotiate in the middle of a read. Do not
798 * invoke this function untile <em>after</em> initial handshaking is done!
801 tor_tls_set_renegotiate_callback(tor_tls_t
*tls
,
802 void (*cb
)(tor_tls_t
*, void *arg
),
805 tls
->negotiated_callback
= cb
;
806 tls
->callback_arg
= arg
;
807 tls
->got_renegotiate
= 0;
808 #ifdef V2_HANDSHAKE_SERVER
810 SSL_set_info_callback(tls
->ssl
, tor_tls_server_info_callback
);
812 SSL_set_info_callback(tls
->ssl
, NULL
);
817 /** Return whether this tls initiated the connect (client) or
818 * received it (server). */
820 tor_tls_is_server(tor_tls_t
*tls
)
823 return tls
->isServer
;
826 /** Release resources associated with a TLS object. Does not close the
827 * underlying file descriptor.
830 tor_tls_free(tor_tls_t
*tls
)
833 tor_assert(tls
&& tls
->ssl
);
834 removed
= HT_REMOVE(tlsmap
, &tlsmap_root
, tls
);
836 log_warn(LD_BUG
, "Freeing a TLS that was not in the ssl->tls map.");
840 tls
->negotiated_callback
= NULL
;
842 tor_tls_context_decref(tls
->context
);
843 tor_free(tls
->address
);
847 /** Underlying function for TLS reading. Reads up to <b>len</b>
848 * characters from <b>tls</b> into <b>cp</b>. On success, returns the
849 * number of characters read. On failure, returns TOR_TLS_ERROR,
850 * TOR_TLS_CLOSE, TOR_TLS_WANTREAD, or TOR_TLS_WANTWRITE.
853 tor_tls_read(tor_tls_t
*tls
, char *cp
, size_t len
)
857 tor_assert(tls
->ssl
);
858 tor_assert(tls
->state
== TOR_TLS_ST_OPEN
);
859 tor_assert(len
<INT_MAX
);
860 r
= SSL_read(tls
->ssl
, cp
, (int)len
);
862 #ifdef V2_HANDSHAKE_SERVER
863 if (tls
->got_renegotiate
) {
864 /* Renegotiation happened! */
865 log_info(LD_NET
, "Got a TLS renegotiation from %s", ADDR(tls
));
866 if (tls
->negotiated_callback
)
867 tls
->negotiated_callback(tls
, tls
->callback_arg
);
868 tls
->got_renegotiate
= 0;
873 err
= tor_tls_get_error(tls
, r
, CATCH_ZERO
, "reading", LOG_DEBUG
);
874 if (err
== _TOR_TLS_ZERORETURN
|| err
== TOR_TLS_CLOSE
) {
875 log_debug(LD_NET
,"read returned r=%d; TLS is closed",r
);
876 tls
->state
= TOR_TLS_ST_CLOSED
;
877 return TOR_TLS_CLOSE
;
879 tor_assert(err
!= TOR_TLS_DONE
);
880 log_debug(LD_NET
,"read returned r=%d, err=%d",r
,err
);
885 /** Underlying function for TLS writing. Write up to <b>n</b>
886 * characters from <b>cp</b> onto <b>tls</b>. On success, returns the
887 * number of characters written. On failure, returns TOR_TLS_ERROR,
888 * TOR_TLS_WANTREAD, or TOR_TLS_WANTWRITE.
891 tor_tls_write(tor_tls_t
*tls
, const char *cp
, size_t n
)
895 tor_assert(tls
->ssl
);
896 tor_assert(tls
->state
== TOR_TLS_ST_OPEN
);
897 tor_assert(n
< INT_MAX
);
900 if (tls
->wantwrite_n
) {
901 /* if WANTWRITE last time, we must use the _same_ n as before */
902 tor_assert(n
>= tls
->wantwrite_n
);
903 log_debug(LD_NET
,"resuming pending-write, (%d to flush, reusing %d)",
904 (int)n
, (int)tls
->wantwrite_n
);
905 n
= tls
->wantwrite_n
;
906 tls
->wantwrite_n
= 0;
908 r
= SSL_write(tls
->ssl
, cp
, (int)n
);
909 err
= tor_tls_get_error(tls
, r
, 0, "writing", LOG_INFO
);
910 if (err
== TOR_TLS_DONE
) {
913 if (err
== TOR_TLS_WANTWRITE
|| err
== TOR_TLS_WANTREAD
) {
914 tls
->wantwrite_n
= n
;
919 /** Perform initial handshake on <b>tls</b>. When finished, returns
920 * TOR_TLS_DONE. On failure, returns TOR_TLS_ERROR, TOR_TLS_WANTREAD,
921 * or TOR_TLS_WANTWRITE.
924 tor_tls_handshake(tor_tls_t
*tls
)
928 tor_assert(tls
->ssl
);
929 tor_assert(tls
->state
== TOR_TLS_ST_HANDSHAKE
);
930 check_no_tls_errors();
932 r
= SSL_accept(tls
->ssl
);
934 r
= SSL_connect(tls
->ssl
);
936 r
= tor_tls_get_error(tls
,r
,0, "handshaking", LOG_INFO
);
937 if (ERR_peek_error() != 0) {
938 tls_log_errors(tls
, tls
->isServer
? LOG_INFO
: LOG_WARN
,
940 return TOR_TLS_ERROR_MISC
;
942 if (r
== TOR_TLS_DONE
) {
943 tls
->state
= TOR_TLS_ST_OPEN
;
945 SSL_set_info_callback(tls
->ssl
, NULL
);
946 SSL_set_verify(tls
->ssl
, SSL_VERIFY_PEER
, always_accept_verify_cb
);
947 /* There doesn't seem to be a clear OpenSSL API to clear mode flags. */
948 tls
->ssl
->mode
&= ~SSL_MODE_NO_AUTO_CHAIN
;
949 #ifdef V2_HANDSHAKE_SERVER
950 if (tor_tls_client_is_using_v2_ciphers(tls
->ssl
, ADDR(tls
))) {
951 /* This check is redundant, but back when we did it in the callback,
952 * we might have not been able to look up the tor_tls_t if the code
953 * was buggy. Fixing that. */
954 if (!tls
->wasV2Handshake
) {
955 log_warn(LD_BUG
, "For some reason, wasV2Handshake didn't"
956 " get set. Fixing that.");
958 tls
->wasV2Handshake
= 1;
959 log_debug(LD_NET
, "Completed V2 TLS handshake with client; waiting "
960 "for renegotiation.");
962 tls
->wasV2Handshake
= 0;
966 #ifdef V2_HANDSHAKE_CLIENT
967 /* If we got no ID cert, we're a v2 handshake. */
968 X509
*cert
= SSL_get_peer_certificate(tls
->ssl
);
969 STACK_OF(X509
) *chain
= SSL_get_peer_cert_chain(tls
->ssl
);
970 int n_certs
= sk_X509_num(chain
);
971 if (n_certs
> 1 || (n_certs
== 1 && cert
!= sk_X509_value(chain
, 0)))
972 tls
->wasV2Handshake
= 0;
974 log_debug(LD_NET
, "Server sent back a single certificate; looks like "
975 "a v2 handshake on %p.", tls
);
976 tls
->wasV2Handshake
= 1;
981 SSL_set_cipher_list(tls
->ssl
, SERVER_CIPHER_LIST
);
987 /** Client only: Renegotiate a TLS session. When finished, returns
988 * TOR_TLS_DONE. On failure, returns TOR_TLS_ERROR, TOR_TLS_WANTREAD, or
992 tor_tls_renegotiate(tor_tls_t
*tls
)
996 /* We could do server-initiated renegotiation too, but that would be tricky.
997 * Instead of "SSL_renegotiate, then SSL_do_handshake until done" */
998 tor_assert(!tls
->isServer
);
999 if (tls
->state
!= TOR_TLS_ST_RENEGOTIATE
) {
1000 int r
= SSL_renegotiate(tls
->ssl
);
1002 return tor_tls_get_error(tls
, r
, 0, "renegotiating", LOG_WARN
);
1004 tls
->state
= TOR_TLS_ST_RENEGOTIATE
;
1006 r
= SSL_do_handshake(tls
->ssl
);
1008 tls
->state
= TOR_TLS_ST_OPEN
;
1009 return TOR_TLS_DONE
;
1011 return tor_tls_get_error(tls
, r
, 0, "renegotiating handshake", LOG_INFO
);
1014 /** Shut down an open tls connection <b>tls</b>. When finished, returns
1015 * TOR_TLS_DONE. On failure, returns TOR_TLS_ERROR, TOR_TLS_WANTREAD,
1016 * or TOR_TLS_WANTWRITE.
1019 tor_tls_shutdown(tor_tls_t
*tls
)
1024 tor_assert(tls
->ssl
);
1027 if (tls
->state
== TOR_TLS_ST_SENTCLOSE
) {
1028 /* If we've already called shutdown once to send a close message,
1029 * we read until the other side has closed too.
1032 r
= SSL_read(tls
->ssl
, buf
, 128);
1034 err
= tor_tls_get_error(tls
, r
, CATCH_ZERO
, "reading to shut down",
1036 if (err
== _TOR_TLS_ZERORETURN
) {
1037 tls
->state
= TOR_TLS_ST_GOTCLOSE
;
1038 /* fall through... */
1044 r
= SSL_shutdown(tls
->ssl
);
1046 /* If shutdown returns 1, the connection is entirely closed. */
1047 tls
->state
= TOR_TLS_ST_CLOSED
;
1048 return TOR_TLS_DONE
;
1050 err
= tor_tls_get_error(tls
, r
, CATCH_SYSCALL
|CATCH_ZERO
, "shutting down",
1052 if (err
== _TOR_TLS_SYSCALL
) {
1053 /* The underlying TCP connection closed while we were shutting down. */
1054 tls
->state
= TOR_TLS_ST_CLOSED
;
1055 return TOR_TLS_DONE
;
1056 } else if (err
== _TOR_TLS_ZERORETURN
) {
1057 /* The TLS connection says that it sent a shutdown record, but
1058 * isn't done shutting down yet. Make sure that this hasn't
1059 * happened before, then go back to the start of the function
1062 if (tls
->state
== TOR_TLS_ST_GOTCLOSE
||
1063 tls
->state
== TOR_TLS_ST_SENTCLOSE
) {
1064 log(LOG_WARN
, LD_NET
,
1065 "TLS returned \"half-closed\" value while already half-closed");
1066 return TOR_TLS_ERROR_MISC
;
1068 tls
->state
= TOR_TLS_ST_SENTCLOSE
;
1069 /* fall through ... */
1076 /** Return true iff this TLS connection is authenticated.
1079 tor_tls_peer_has_cert(tor_tls_t
*tls
)
1082 cert
= SSL_get_peer_certificate(tls
->ssl
);
1083 tls_log_errors(tls
, LOG_WARN
, "getting peer certificate");
1090 /** Warn that a certificate lifetime extends through a certain range. */
1092 log_cert_lifetime(X509
*cert
, const char *problem
)
1096 char *s1
=NULL
, *s2
=NULL
;
1098 time_t now
= time(NULL
);
1102 log_warn(LD_GENERAL
,
1103 "Certificate %s: is your system clock set incorrectly?",
1106 if (!(bio
= BIO_new(BIO_s_mem()))) {
1107 log_warn(LD_GENERAL
, "Couldn't allocate BIO!"); goto end
;
1109 if (!(ASN1_TIME_print(bio
, X509_get_notBefore(cert
)))) {
1110 tls_log_errors(NULL
, LOG_WARN
, "printing certificate lifetime");
1113 BIO_get_mem_ptr(bio
, &buf
);
1114 s1
= tor_strndup(buf
->data
, buf
->length
);
1116 (void)BIO_reset(bio
);
1117 if (!(ASN1_TIME_print(bio
, X509_get_notAfter(cert
)))) {
1118 tls_log_errors(NULL
, LOG_WARN
, "printing certificate lifetime");
1121 BIO_get_mem_ptr(bio
, &buf
);
1122 s2
= tor_strndup(buf
->data
, buf
->length
);
1124 strftime(mytime
, 32, "%b %d %H:%M:%S %Y GMT", tor_gmtime_r(&now
, &tm
));
1126 log_warn(LD_GENERAL
,
1127 "(certificate lifetime runs from %s through %s. Your time is %s.)",
1131 /* Not expected to get invoked */
1132 tls_log_errors(NULL
, LOG_WARN
, "getting certificate lifetime");
1141 /** Helper function: try to extract a link certificate and an identity
1142 * certificate from <b>tls</b>, and store them in *<b>cert_out</b> and
1143 * *<b>id_cert_out</b> respectively. Log all messages at level
1146 * Note that a reference is added to cert_out, so it needs to be
1147 * freed. id_cert_out doesn't. */
1149 try_to_extract_certs_from_tls(int severity
, tor_tls_t
*tls
,
1150 X509
**cert_out
, X509
**id_cert_out
)
1152 X509
*cert
= NULL
, *id_cert
= NULL
;
1153 STACK_OF(X509
) *chain
= NULL
;
1154 int num_in_chain
, i
;
1155 *cert_out
= *id_cert_out
= NULL
;
1157 if (!(cert
= SSL_get_peer_certificate(tls
->ssl
)))
1160 if (!(chain
= SSL_get_peer_cert_chain(tls
->ssl
)))
1162 num_in_chain
= sk_X509_num(chain
);
1163 /* 1 means we're receiving (server-side), and it's just the id_cert.
1164 * 2 means we're connecting (client-side), and it's both the link
1165 * cert and the id_cert.
1167 if (num_in_chain
< 1) {
1168 log_fn(severity
,LD_PROTOCOL
,
1169 "Unexpected number of certificates in chain (%d)",
1173 for (i
=0; i
<num_in_chain
; ++i
) {
1174 id_cert
= sk_X509_value(chain
, i
);
1175 if (X509_cmp(id_cert
, cert
) != 0)
1178 *id_cert_out
= id_cert
;
1181 /** If the provided tls connection is authenticated and has a
1182 * certificate chain that is currently valid and signed, then set
1183 * *<b>identity_key</b> to the identity certificate's key and return
1184 * 0. Else, return -1 and log complaints with log-level <b>severity</b>.
1187 tor_tls_verify(int severity
, tor_tls_t
*tls
, crypto_pk_env_t
**identity_key
)
1189 X509
*cert
= NULL
, *id_cert
= NULL
;
1190 EVP_PKEY
*id_pkey
= NULL
;
1194 *identity_key
= NULL
;
1196 try_to_extract_certs_from_tls(severity
, tls
, &cert
, &id_cert
);
1200 log_fn(severity
,LD_PROTOCOL
,"No distinct identity certificate found");
1203 if (!(id_pkey
= X509_get_pubkey(id_cert
)) ||
1204 X509_verify(cert
, id_pkey
) <= 0) {
1205 log_fn(severity
,LD_PROTOCOL
,"X509_verify on cert and pkey returned <= 0");
1206 tls_log_errors(tls
, severity
,"verifying certificate");
1210 rsa
= EVP_PKEY_get1_RSA(id_pkey
);
1213 *identity_key
= _crypto_new_pk_env_rsa(rsa
);
1221 EVP_PKEY_free(id_pkey
);
1223 /* This should never get invoked, but let's make sure in case OpenSSL
1224 * acts unexpectedly. */
1225 tls_log_errors(tls
, LOG_WARN
, "finishing tor_tls_verify");
1230 /** Check whether the certificate set on the connection <b>tls</b> is
1231 * expired or not-yet-valid, give or take <b>tolerance</b>
1232 * seconds. Return 0 for valid, -1 for failure.
1234 * NOTE: you should call tor_tls_verify before tor_tls_check_lifetime.
1237 tor_tls_check_lifetime(tor_tls_t
*tls
, int tolerance
)
1245 if (!(cert
= SSL_get_peer_certificate(tls
->ssl
)))
1248 t
= now
+ tolerance
;
1249 if (X509_cmp_time(X509_get_notBefore(cert
), &t
) > 0) {
1250 log_cert_lifetime(cert
, "not yet valid");
1253 t
= now
- tolerance
;
1254 if (X509_cmp_time(X509_get_notAfter(cert
), &t
) < 0) {
1255 log_cert_lifetime(cert
, "already expired");
1263 /* Not expected to get invoked */
1264 tls_log_errors(tls
, LOG_WARN
, "checking certificate lifetime");
1269 /** Return the number of bytes available for reading from <b>tls</b>.
1272 tor_tls_get_pending_bytes(tor_tls_t
*tls
)
1275 return SSL_pending(tls
->ssl
);
1278 /** If <b>tls</b> requires that the next write be of a particular size,
1279 * return that size. Otherwise, return 0. */
1281 tor_tls_get_forced_write_size(tor_tls_t
*tls
)
1283 return tls
->wantwrite_n
;
1286 /** Sets n_read and n_written to the number of bytes read and written,
1287 * respectively, on the raw socket used by <b>tls</b> since the last time this
1288 * function was called on <b>tls</b>. */
1290 tor_tls_get_n_raw_bytes(tor_tls_t
*tls
, size_t *n_read
, size_t *n_written
)
1294 r
= BIO_number_read(SSL_get_rbio(tls
->ssl
));
1295 /* We want the number of bytes actually for real written. Unfortunately,
1296 * sometimes OpenSSL replaces the wbio on tls->ssl with a buffering bio,
1297 * which makes the answer turn out wrong. Let's cope with that. Note
1298 * that this approach will fail if we ever replace tls->ssl's BIOs with
1299 * buffering bios for reasons of our own. As an alternative, we could
1300 * save the original BIO for tls->ssl in the tor_tls_t structure, but
1301 * that would be tempting fate. */
1302 wbio
= SSL_get_wbio(tls
->ssl
);
1303 if (wbio
->method
== BIO_f_buffer() && (tmpbio
= BIO_next(wbio
)) != NULL
)
1305 w
= BIO_number_written(wbio
);
1307 /* We are ok with letting these unsigned ints go "negative" here:
1308 * If we wrapped around, this should still give us the right answer, unless
1309 * we wrapped around by more than ULONG_MAX since the last time we called
1312 *n_read
= (size_t)(r
- tls
->last_read_count
);
1313 *n_written
= (size_t)(w
- tls
->last_write_count
);
1314 if (*n_read
> INT_MAX
|| *n_written
> INT_MAX
) {
1315 log_warn(LD_BUG
, "Preposterously large value in tor_tls_get_n_raw_bytes. "
1316 "r=%lu, last_read=%lu, w=%lu, last_written=%lu",
1317 r
, tls
->last_read_count
, w
, tls
->last_write_count
);
1319 tls
->last_read_count
= r
;
1320 tls
->last_write_count
= w
;
1323 /** Implement check_no_tls_errors: If there are any pending OpenSSL
1324 * errors, log an error message. */
1326 _check_no_tls_errors(const char *fname
, int line
)
1328 if (ERR_peek_error() == 0)
1330 log(LOG_WARN
, LD_CRYPTO
, "Unhandled OpenSSL errors found at %s:%d: ",
1331 tor_fix_source_file(fname
), line
);
1332 tls_log_errors(NULL
, LOG_WARN
, NULL
);
1335 /** Return true iff the initial TLS connection at <b>tls</b> did not use a v2
1336 * TLS handshake. Output is undefined if the handshake isn't finished. */
1338 tor_tls_used_v1_handshake(tor_tls_t
*tls
)
1340 if (tls
->isServer
) {
1341 #ifdef V2_HANDSHAKE_SERVER
1342 return ! tls
->wasV2Handshake
;
1345 #ifdef V2_HANDSHAKE_CLIENT
1346 return ! tls
->wasV2Handshake
;
1354 tor_tls_get_buffer_sizes(tor_tls_t
*tls
,
1355 int *rbuf_capacity
, int *rbuf_bytes
,
1356 int *wbuf_capacity
, int *wbuf_bytes
)
1358 if (tls
->ssl
->s3
->rbuf
.buf
)
1359 *rbuf_capacity
= tls
->ssl
->s3
->rbuf
.len
;
1362 if (tls
->ssl
->s3
->wbuf
.buf
)
1363 *wbuf_capacity
= tls
->ssl
->s3
->wbuf
.len
;
1366 *rbuf_bytes
= tls
->ssl
->s3
->rbuf
.left
;
1367 *wbuf_bytes
= tls
->ssl
->s3
->wbuf
.left
;