1 /***************************************************************************
3 * Project ___| | | | _ \| |
5 * | (__| |_| | _ <| |___
6 * \___|\___/|_| \_\_____|
8 * Copyright (C) 1998 - 2014, Daniel Stenberg, <daniel@haxx.se>, et al.
10 * This software is licensed as described in the file COPYING, which
11 * you should have received as part of this distribution. The terms
12 * are also available at http://curl.haxx.se/docs/copyright.html.
14 * You may opt to use, copy, modify, merge, publish, distribute and/or sell
15 * copies of the Software, and permit persons to whom the Software is
16 * furnished to do so, under the terms of the COPYING file.
18 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
19 * KIND, either express or implied.
21 ***************************************************************************/
24 * Source file for all GnuTLS-specific code for the TLS/SSL layer. No code
25 * but vtls.c should ever call or use these functions.
27 * Note: don't use the GnuTLS' *_t variable type names in this source code,
28 * since they were not present in 1.0.X.
31 #include "curl_setup.h"
35 #include <gnutls/gnutls.h>
36 #include <gnutls/x509.h>
38 #ifdef USE_GNUTLS_NETTLE
39 #include <gnutls/crypto.h>
40 #include <nettle/md5.h>
47 #include "inet_pton.h"
50 #include "parsedate.h"
51 #include "connect.h" /* for the connect timeout */
55 #define _MPRINTF_REPLACE /* use our functions only */
56 #include <curl/mprintf.h>
57 #include "curl_memory.h"
58 /* The last #include file should be: */
62 Some hackish cast macros based on:
63 http://library.gnome.org/devel/glib/unstable/glib-Type-Conversion-Macros.html
65 #ifndef GNUTLS_POINTER_TO_INT_CAST
66 #define GNUTLS_POINTER_TO_INT_CAST(p) ((int) (long) (p))
68 #ifndef GNUTLS_INT_TO_POINTER_CAST
69 #define GNUTLS_INT_TO_POINTER_CAST(i) ((void*) (long) (i))
72 /* Enable GnuTLS debugging by defining GTLSDEBUG */
73 /*#define GTLSDEBUG */
76 static void tls_log_func(int level, const char *str)
78 fprintf(stderr, "|<%d>| %s", level, str);
81 static bool gtls_inited = FALSE;
83 #if defined(GNUTLS_VERSION_NUMBER)
84 # if (GNUTLS_VERSION_NUMBER >= 0x020c00)
85 # undef gnutls_transport_set_lowat
86 # define gnutls_transport_set_lowat(A,B) Curl_nop_stmt
87 # define USE_GNUTLS_PRIORITY_SET_DIRECT 1
89 # if (GNUTLS_VERSION_NUMBER >= 0x020c03)
90 # define GNUTLS_MAPS_WINSOCK_ERRORS 1
95 # if (GNUTLS_VERSION_NUMBER >= 0x030200)
102 * Custom push and pull callback functions used by GNU TLS to read and write
103 * to the socket. These functions are simple wrappers to send() and recv()
104 * (although here using the sread/swrite macros as defined by
105 * curl_setup_once.h).
106 * We use custom functions rather than the GNU TLS defaults because it allows
107 * us to get specific about the fourth "flags" argument, and to use arbitrary
108 * private data with gnutls_transport_set_ptr if we wish.
110 * When these custom push and pull callbacks fail, GNU TLS checks its own
111 * session-specific error variable, and when not set also its own global
112 * errno variable, in order to take appropriate action. GNU TLS does not
113 * require that the transport is actually a socket. This implies that for
114 * Windows builds these callbacks should ideally set the session-specific
115 * error variable using function gnutls_transport_set_errno or as a last
116 * resort global errno variable using gnutls_transport_set_global_errno,
117 * with a transport agnostic error value. This implies that some winsock
118 * error translation must take place in these callbacks.
120 * Paragraph above applies to GNU TLS versions older than 2.12.3, since
121 * this version GNU TLS does its own internal winsock error translation
122 * using system_errno() function.
125 #if defined(USE_WINSOCK) && !defined(GNUTLS_MAPS_WINSOCK_ERRORS)
126 # define gtls_EINTR 4
128 # define gtls_EAGAIN 11
129 static int gtls_mapped_sockerrno(void)
143 static ssize_t Curl_gtls_push(void *s, const void *buf, size_t len)
145 ssize_t ret = swrite(GNUTLS_POINTER_TO_INT_CAST(s), buf, len);
146 #if defined(USE_WINSOCK) && !defined(GNUTLS_MAPS_WINSOCK_ERRORS)
148 gnutls_transport_set_global_errno(gtls_mapped_sockerrno());
153 static ssize_t Curl_gtls_pull(void *s, void *buf, size_t len)
155 ssize_t ret = sread(GNUTLS_POINTER_TO_INT_CAST(s), buf, len);
156 #if defined(USE_WINSOCK) && !defined(GNUTLS_MAPS_WINSOCK_ERRORS)
158 gnutls_transport_set_global_errno(gtls_mapped_sockerrno());
165 * Global GnuTLS init, called from Curl_ssl_init(). This calls functions that
166 * are not thread-safe and thus this function itself is not thread-safe and
167 * must only be called from within curl_global_init() to keep the thread
168 * situation under control!
170 int Curl_gtls_init(void)
174 ret = gnutls_global_init()?0:1;
176 gnutls_global_set_log_function(tls_log_func);
177 gnutls_global_set_log_level(2);
184 int Curl_gtls_cleanup(void)
187 gnutls_global_deinit();
193 static void showtime(struct SessionHandle *data,
198 const struct tm *tm = &buffer;
199 CURLcode result = Curl_gmtime(stamp, &buffer);
203 snprintf(data->state.buffer,
205 "\t %s: %s, %02d %s %4d %02d:%02d:%02d GMT\n",
207 Curl_wkday[tm->tm_wday?tm->tm_wday-1:6],
209 Curl_month[tm->tm_mon],
214 infof(data, "%s\n", data->state.buffer);
217 static gnutls_datum_t load_file (const char *file)
220 gnutls_datum_t loaded_file = { NULL, 0 };
224 if(!(f = fopen(file, "r")))
226 if(fseek(f, 0, SEEK_END) != 0
227 || (filelen = ftell(f)) < 0
228 || fseek(f, 0, SEEK_SET) != 0
229 || !(ptr = malloc((size_t)filelen)))
231 if(fread(ptr, 1, (size_t)filelen, f) < (size_t)filelen) {
236 loaded_file.data = ptr;
237 loaded_file.size = (unsigned int)filelen;
243 static void unload_file(gnutls_datum_t data) {
248 /* this function does a SSL/TLS (re-)handshake */
249 static CURLcode handshake(struct connectdata *conn,
254 struct SessionHandle *data = conn->data;
255 struct ssl_connect_data *connssl = &conn->ssl[sockindex];
256 gnutls_session_t session = conn->ssl[sockindex].session;
257 curl_socket_t sockfd = conn->sock[sockindex];
263 /* check allowed time left */
264 timeout_ms = Curl_timeleft(data, NULL, duringconnect);
267 /* no need to continue if time already is up */
268 failf(data, "SSL connection timeout");
269 return CURLE_OPERATION_TIMEDOUT;
272 /* if ssl is expecting something, check if it's available. */
273 if(connssl->connecting_state == ssl_connect_2_reading
274 || connssl->connecting_state == ssl_connect_2_writing) {
276 curl_socket_t writefd = ssl_connect_2_writing==
277 connssl->connecting_state?sockfd:CURL_SOCKET_BAD;
278 curl_socket_t readfd = ssl_connect_2_reading==
279 connssl->connecting_state?sockfd:CURL_SOCKET_BAD;
281 what = Curl_socket_ready(readfd, writefd,
283 timeout_ms?timeout_ms:1000);
286 failf(data, "select/poll on SSL socket, errno: %d", SOCKERRNO);
287 return CURLE_SSL_CONNECT_ERROR;
292 else if(timeout_ms) {
294 failf(data, "SSL connection timeout at %ld", timeout_ms);
295 return CURLE_OPERATION_TIMEDOUT;
298 /* socket is readable or writable */
301 rc = gnutls_handshake(session);
303 if((rc == GNUTLS_E_AGAIN) || (rc == GNUTLS_E_INTERRUPTED)) {
304 connssl->connecting_state =
305 gnutls_record_get_direction(session)?
306 ssl_connect_2_writing:ssl_connect_2_reading;
311 else if((rc < 0) && !gnutls_error_is_fatal(rc)) {
312 const char *strerr = NULL;
314 if(rc == GNUTLS_E_WARNING_ALERT_RECEIVED) {
315 int alert = gnutls_alert_get(session);
316 strerr = gnutls_alert_get_name(alert);
320 strerr = gnutls_strerror(rc);
322 failf(data, "gnutls_handshake() warning: %s", strerr);
325 const char *strerr = NULL;
327 if(rc == GNUTLS_E_FATAL_ALERT_RECEIVED) {
328 int alert = gnutls_alert_get(session);
329 strerr = gnutls_alert_get_name(alert);
333 strerr = gnutls_strerror(rc);
335 failf(data, "gnutls_handshake() failed: %s", strerr);
336 return CURLE_SSL_CONNECT_ERROR;
339 /* Reset our connect state machine */
340 connssl->connecting_state = ssl_connect_1;
345 static gnutls_x509_crt_fmt_t do_file_type(const char *type)
347 if(!type || !type[0])
348 return GNUTLS_X509_FMT_PEM;
349 if(Curl_raw_equal(type, "PEM"))
350 return GNUTLS_X509_FMT_PEM;
351 if(Curl_raw_equal(type, "DER"))
352 return GNUTLS_X509_FMT_DER;
357 gtls_connect_step1(struct connectdata *conn,
360 struct SessionHandle *data = conn->data;
361 gnutls_session_t session;
365 bool sni = TRUE; /* default is SNI enabled */
367 struct in6_addr addr;
371 #ifndef USE_GNUTLS_PRIORITY_SET_DIRECT
372 static const int cipher_priority[] = {
373 /* These two ciphers were added to GnuTLS as late as ver. 3.0.1,
374 but this code path is only ever used for ver. < 2.12.0.
375 GNUTLS_CIPHER_AES_128_GCM,
376 GNUTLS_CIPHER_AES_256_GCM,
378 GNUTLS_CIPHER_AES_128_CBC,
379 GNUTLS_CIPHER_AES_256_CBC,
380 GNUTLS_CIPHER_CAMELLIA_128_CBC,
381 GNUTLS_CIPHER_CAMELLIA_256_CBC,
382 GNUTLS_CIPHER_3DES_CBC,
384 static const int cert_type_priority[] = { GNUTLS_CRT_X509, 0 };
385 static int protocol_priority[] = { 0, 0, 0, 0 };
387 #define GNUTLS_CIPHERS "NORMAL:-ARCFOUR-128:-CTYPE-ALL:+CTYPE-X509"
388 const char* prioritylist;
389 const char *err = NULL;
392 int protocols_size = 2;
393 gnutls_datum_t protocols[2];
396 if(conn->ssl[sockindex].state == ssl_connection_complete)
397 /* to make us tolerant against being called more than once for the
404 /* GnuTLS only supports SSLv3 and TLSv1 */
405 if(data->set.ssl.version == CURL_SSLVERSION_SSLv2) {
406 failf(data, "GnuTLS does not support SSLv2");
407 return CURLE_SSL_CONNECT_ERROR;
409 else if(data->set.ssl.version == CURL_SSLVERSION_SSLv3)
410 sni = FALSE; /* SSLv3 has no SNI */
412 /* allocate a cred struct */
413 rc = gnutls_certificate_allocate_credentials(&conn->ssl[sockindex].cred);
414 if(rc != GNUTLS_E_SUCCESS) {
415 failf(data, "gnutls_cert_all_cred() failed: %s", gnutls_strerror(rc));
416 return CURLE_SSL_CONNECT_ERROR;
420 if(data->set.ssl.authtype == CURL_TLSAUTH_SRP) {
421 infof(data, "Using TLS-SRP username: %s\n", data->set.ssl.username);
423 rc = gnutls_srp_allocate_client_credentials(
424 &conn->ssl[sockindex].srp_client_cred);
425 if(rc != GNUTLS_E_SUCCESS) {
426 failf(data, "gnutls_srp_allocate_client_cred() failed: %s",
427 gnutls_strerror(rc));
428 return CURLE_OUT_OF_MEMORY;
431 rc = gnutls_srp_set_client_credentials(conn->ssl[sockindex].
433 data->set.ssl.username,
434 data->set.ssl.password);
435 if(rc != GNUTLS_E_SUCCESS) {
436 failf(data, "gnutls_srp_set_client_cred() failed: %s",
437 gnutls_strerror(rc));
438 return CURLE_BAD_FUNCTION_ARGUMENT;
443 if(data->set.ssl.CAfile) {
444 /* set the trusted CA cert bundle file */
445 gnutls_certificate_set_verify_flags(conn->ssl[sockindex].cred,
446 GNUTLS_VERIFY_ALLOW_X509_V1_CA_CRT);
448 rc = gnutls_certificate_set_x509_trust_file(conn->ssl[sockindex].cred,
449 data->set.ssl.CAfile,
450 GNUTLS_X509_FMT_PEM);
452 infof(data, "error reading ca cert file %s (%s)\n",
453 data->set.ssl.CAfile, gnutls_strerror(rc));
454 if(data->set.ssl.verifypeer)
455 return CURLE_SSL_CACERT_BADFILE;
458 infof(data, "found %d certificates in %s\n",
459 rc, data->set.ssl.CAfile);
462 if(data->set.ssl.CRLfile) {
463 /* set the CRL list file */
464 rc = gnutls_certificate_set_x509_crl_file(conn->ssl[sockindex].cred,
465 data->set.ssl.CRLfile,
466 GNUTLS_X509_FMT_PEM);
468 failf(data, "error reading crl file %s (%s)",
469 data->set.ssl.CRLfile, gnutls_strerror(rc));
470 return CURLE_SSL_CRL_BADFILE;
473 infof(data, "found %d CRL in %s\n",
474 rc, data->set.ssl.CRLfile);
477 /* Initialize TLS session as a client */
478 rc = gnutls_init(&conn->ssl[sockindex].session, GNUTLS_CLIENT);
479 if(rc != GNUTLS_E_SUCCESS) {
480 failf(data, "gnutls_init() failed: %d", rc);
481 return CURLE_SSL_CONNECT_ERROR;
484 /* convenient assign */
485 session = conn->ssl[sockindex].session;
487 if((0 == Curl_inet_pton(AF_INET, conn->host.name, &addr)) &&
489 (0 == Curl_inet_pton(AF_INET6, conn->host.name, &addr)) &&
492 (gnutls_server_name_set(session, GNUTLS_NAME_DNS, conn->host.name,
493 strlen(conn->host.name)) < 0))
494 infof(data, "WARNING: failed to configure server name indication (SNI) "
497 /* Use default priorities */
498 rc = gnutls_set_default_priority(session);
499 if(rc != GNUTLS_E_SUCCESS)
500 return CURLE_SSL_CONNECT_ERROR;
502 #ifndef USE_GNUTLS_PRIORITY_SET_DIRECT
503 rc = gnutls_cipher_set_priority(session, cipher_priority);
504 if(rc != GNUTLS_E_SUCCESS)
505 return CURLE_SSL_CONNECT_ERROR;
507 /* Sets the priority on the certificate types supported by gnutls. Priority
508 is higher for types specified before others. After specifying the types
509 you want, you must append a 0. */
510 rc = gnutls_certificate_type_set_priority(session, cert_type_priority);
511 if(rc != GNUTLS_E_SUCCESS)
512 return CURLE_SSL_CONNECT_ERROR;
514 if(data->set.ssl.cipher_list != NULL) {
515 failf(data, "can't pass a custom cipher list to older GnuTLS"
517 return CURLE_SSL_CONNECT_ERROR;
520 switch (data->set.ssl.version) {
521 case CURL_SSLVERSION_SSLv3:
522 protocol_priority[0] = GNUTLS_SSL3;
524 case CURL_SSLVERSION_DEFAULT:
525 case CURL_SSLVERSION_TLSv1:
526 protocol_priority[0] = GNUTLS_TLS1_0;
527 protocol_priority[1] = GNUTLS_TLS1_1;
528 protocol_priority[2] = GNUTLS_TLS1_2;
530 case CURL_SSLVERSION_TLSv1_0:
531 protocol_priority[0] = GNUTLS_TLS1_0;
533 case CURL_SSLVERSION_TLSv1_1:
534 protocol_priority[0] = GNUTLS_TLS1_1;
536 case CURL_SSLVERSION_TLSv1_2:
537 protocol_priority[0] = GNUTLS_TLS1_2;
539 case CURL_SSLVERSION_SSLv2:
541 failf(data, "GnuTLS does not support SSLv2");
542 return CURLE_SSL_CONNECT_ERROR;
545 rc = gnutls_protocol_set_priority(session, protocol_priority);
546 if(rc != GNUTLS_E_SUCCESS) {
547 failf(data, "Did you pass a valid GnuTLS cipher list?");
548 return CURLE_SSL_CONNECT_ERROR;
552 switch (data->set.ssl.version) {
553 case CURL_SSLVERSION_SSLv3:
554 prioritylist = GNUTLS_CIPHERS ":-VERS-TLS-ALL:+VERS-SSL3.0";
557 case CURL_SSLVERSION_DEFAULT:
558 case CURL_SSLVERSION_TLSv1:
559 prioritylist = GNUTLS_CIPHERS ":-VERS-SSL3.0:+SRP";
561 case CURL_SSLVERSION_TLSv1_0:
562 prioritylist = GNUTLS_CIPHERS ":-VERS-SSL3.0:-VERS-TLS-ALL:"
565 case CURL_SSLVERSION_TLSv1_1:
566 prioritylist = GNUTLS_CIPHERS ":-VERS-SSL3.0:-VERS-TLS-ALL:"
569 case CURL_SSLVERSION_TLSv1_2:
570 prioritylist = GNUTLS_CIPHERS ":-VERS-SSL3.0:-VERS-TLS-ALL:"
573 case CURL_SSLVERSION_SSLv2:
575 failf(data, "GnuTLS does not support SSLv2");
576 return CURLE_SSL_CONNECT_ERROR;
579 rc = gnutls_priority_set_direct(session, prioritylist, &err);
580 if(rc != GNUTLS_E_SUCCESS) {
581 failf(data, "Error %d setting GnuTLS cipher list starting with %s",
583 return CURLE_SSL_CONNECT_ERROR;
588 if(data->set.httpversion == CURL_HTTP_VERSION_2_0) {
589 if(data->set.ssl_enable_alpn) {
590 protocols[0].data = NGHTTP2_PROTO_VERSION_ID;
591 protocols[0].size = NGHTTP2_PROTO_VERSION_ID_LEN;
592 protocols[1].data = ALPN_HTTP_1_1;
593 protocols[1].size = ALPN_HTTP_1_1_LENGTH;
594 gnutls_alpn_set_protocols(session, protocols, protocols_size, 0);
595 infof(data, "ALPN, offering %s, %s\n", NGHTTP2_PROTO_VERSION_ID,
599 infof(data, "SSL, can't negotiate HTTP/2.0 without ALPN\n");
604 if(data->set.str[STRING_CERT]) {
605 if(gnutls_certificate_set_x509_key_file(
606 conn->ssl[sockindex].cred,
607 data->set.str[STRING_CERT],
608 data->set.str[STRING_KEY] ?
609 data->set.str[STRING_KEY] : data->set.str[STRING_CERT],
610 do_file_type(data->set.str[STRING_CERT_TYPE]) ) !=
612 failf(data, "error reading X.509 key or certificate file");
613 return CURLE_SSL_CONNECT_ERROR;
618 /* put the credentials to the current session */
619 if(data->set.ssl.authtype == CURL_TLSAUTH_SRP) {
620 rc = gnutls_credentials_set(session, GNUTLS_CRD_SRP,
621 conn->ssl[sockindex].srp_client_cred);
622 if(rc != GNUTLS_E_SUCCESS)
623 failf(data, "gnutls_credentials_set() failed: %s", gnutls_strerror(rc));
627 rc = gnutls_credentials_set(session, GNUTLS_CRD_CERTIFICATE,
628 conn->ssl[sockindex].cred);
630 /* set the connection handle (file descriptor for the socket) */
631 gnutls_transport_set_ptr(session,
632 GNUTLS_INT_TO_POINTER_CAST(conn->sock[sockindex]));
634 /* register callback functions to send and receive data. */
635 gnutls_transport_set_push_function(session, Curl_gtls_push);
636 gnutls_transport_set_pull_function(session, Curl_gtls_pull);
638 /* lowat must be set to zero when using custom push and pull functions. */
639 gnutls_transport_set_lowat(session, 0);
641 /* This might be a reconnect, so we check for a session ID in the cache
642 to speed up things */
644 if(!Curl_ssl_getsessionid(conn, &ssl_sessionid, &ssl_idsize)) {
645 /* we got a session id, use it! */
646 gnutls_session_set_data(session, ssl_sessionid, ssl_idsize);
648 /* Informational message */
649 infof (data, "SSL re-using session ID\n");
655 static Curl_recv gtls_recv;
656 static Curl_send gtls_send;
659 gtls_connect_step3(struct connectdata *conn,
662 unsigned int cert_list_size;
663 const gnutls_datum_t *chainp;
664 unsigned int verify_status;
665 gnutls_x509_crt_t x509_cert,x509_issuer;
666 gnutls_datum_t issuerp;
667 char certbuf[256] = ""; /* big enough? */
673 struct SessionHandle *data = conn->data;
674 gnutls_session_t session = conn->ssl[sockindex].session;
679 gnutls_datum_t proto;
681 CURLcode result = CURLE_OK;
683 /* This function will return the peer's raw certificate (chain) as sent by
684 the peer. These certificates are in raw format (DER encoded for
685 X.509). In case of a X.509 then a certificate list may be present. The
686 first certificate in the list is the peer's certificate, following the
687 issuer's certificate, then the issuer's issuer etc. */
689 chainp = gnutls_certificate_get_peers(session, &cert_list_size);
691 if(data->set.ssl.verifypeer ||
692 data->set.ssl.verifyhost ||
693 data->set.ssl.issuercert) {
695 if(data->set.ssl.authtype == CURL_TLSAUTH_SRP
696 && data->set.ssl.username != NULL
697 && !data->set.ssl.verifypeer
698 && gnutls_cipher_get(session)) {
699 /* no peer cert, but auth is ok if we have SRP user and cipher and no
704 failf(data, "failed to get server cert");
705 return CURLE_PEER_FAILED_VERIFICATION;
710 infof(data, "\t common name: WARNING couldn't obtain\n");
713 if(data->set.ssl.verifypeer) {
714 /* This function will try to verify the peer's certificate and return its
715 status (trusted, invalid etc.). The value of status should be one or
716 more of the gnutls_certificate_status_t enumerated elements bitwise
717 or'd. To avoid denial of service attacks some default upper limits
718 regarding the certificate key size and chain size are set. To override
719 them use gnutls_certificate_set_verify_limits(). */
721 rc = gnutls_certificate_verify_peers2(session, &verify_status);
723 failf(data, "server cert verify failed: %d", rc);
724 return CURLE_SSL_CONNECT_ERROR;
727 /* verify_status is a bitmask of gnutls_certificate_status bits */
728 if(verify_status & GNUTLS_CERT_INVALID) {
729 if(data->set.ssl.verifypeer) {
730 failf(data, "server certificate verification failed. CAfile: %s "
731 "CRLfile: %s", data->set.ssl.CAfile?data->set.ssl.CAfile:"none",
732 data->set.ssl.CRLfile?data->set.ssl.CRLfile:"none");
733 return CURLE_SSL_CACERT;
736 infof(data, "\t server certificate verification FAILED\n");
739 infof(data, "\t server certificate verification OK\n");
742 infof(data, "\t server certificate verification SKIPPED\n");
744 /* initialize an X.509 certificate structure. */
745 gnutls_x509_crt_init(&x509_cert);
748 /* convert the given DER or PEM encoded Certificate to the native
749 gnutls_x509_crt_t format */
750 gnutls_x509_crt_import(x509_cert, chainp, GNUTLS_X509_FMT_DER);
752 if(data->set.ssl.issuercert) {
753 gnutls_x509_crt_init(&x509_issuer);
754 issuerp = load_file(data->set.ssl.issuercert);
755 gnutls_x509_crt_import(x509_issuer, &issuerp, GNUTLS_X509_FMT_PEM);
756 rc = gnutls_x509_crt_check_issuer(x509_cert,x509_issuer);
757 unload_file(issuerp);
759 failf(data, "server certificate issuer check failed (IssuerCert: %s)",
760 data->set.ssl.issuercert?data->set.ssl.issuercert:"none");
761 return CURLE_SSL_ISSUER_ERROR;
763 infof(data,"\t server certificate issuer check OK (Issuer Cert: %s)\n",
764 data->set.ssl.issuercert?data->set.ssl.issuercert:"none");
767 size=sizeof(certbuf);
768 rc = gnutls_x509_crt_get_dn_by_oid(x509_cert, GNUTLS_OID_X520_COMMON_NAME,
769 0, /* the first and only one */
774 infof(data, "error fetching CN from cert:%s\n",
775 gnutls_strerror(rc));
778 /* This function will check if the given certificate's subject matches the
779 given hostname. This is a basic implementation of the matching described
780 in RFC2818 (HTTPS), which takes into account wildcards, and the subject
781 alternative name PKIX extension. Returns non zero on success, and zero on
783 rc = gnutls_x509_crt_check_hostname(x509_cert, conn->host.name);
784 #if GNUTLS_VERSION_NUMBER < 0x030306
785 /* Before 3.3.6, gnutls_x509_crt_check_hostname() didn't check IP
789 #define use_addr in6_addr
791 #define use_addr in_addr
793 unsigned char addrbuf[sizeof(struct use_addr)];
794 unsigned char certaddr[sizeof(struct use_addr)];
795 size_t addrlen = 0, certaddrlen;
799 if(Curl_inet_pton(AF_INET, conn->host.name, addrbuf) > 0)
802 else if(Curl_inet_pton(AF_INET6, conn->host.name, addrbuf) > 0)
808 certaddrlen = sizeof(certaddr);
809 ret = gnutls_x509_crt_get_subject_alt_name(x509_cert, i, certaddr,
811 /* If this happens, it wasn't an IP address. */
812 if(ret == GNUTLS_E_SHORT_MEMORY_BUFFER)
816 if(ret != GNUTLS_SAN_IPADDRESS)
818 if(certaddrlen == addrlen && !memcmp(addrbuf, certaddr, addrlen)) {
827 if(data->set.ssl.verifyhost) {
828 failf(data, "SSL: certificate subject name (%s) does not match "
829 "target host name '%s'", certbuf, conn->host.dispname);
830 gnutls_x509_crt_deinit(x509_cert);
831 return CURLE_PEER_FAILED_VERIFICATION;
834 infof(data, "\t common name: %s (does not match '%s')\n",
835 certbuf, conn->host.dispname);
838 infof(data, "\t common name: %s (matched)\n", certbuf);
840 /* Check for time-based validity */
841 certclock = gnutls_x509_crt_get_expiration_time(x509_cert);
843 if(certclock == (time_t)-1) {
844 if(data->set.ssl.verifypeer) {
845 failf(data, "server cert expiration date verify failed");
846 return CURLE_SSL_CONNECT_ERROR;
849 infof(data, "\t server certificate expiration date verify FAILED\n");
852 if(certclock < time(NULL)) {
853 if(data->set.ssl.verifypeer) {
854 failf(data, "server certificate expiration date has passed.");
855 return CURLE_PEER_FAILED_VERIFICATION;
858 infof(data, "\t server certificate expiration date FAILED\n");
861 infof(data, "\t server certificate expiration date OK\n");
864 certclock = gnutls_x509_crt_get_activation_time(x509_cert);
866 if(certclock == (time_t)-1) {
867 if(data->set.ssl.verifypeer) {
868 failf(data, "server cert activation date verify failed");
869 return CURLE_SSL_CONNECT_ERROR;
872 infof(data, "\t server certificate activation date verify FAILED\n");
875 if(certclock > time(NULL)) {
876 if(data->set.ssl.verifypeer) {
877 failf(data, "server certificate not activated yet.");
878 return CURLE_PEER_FAILED_VERIFICATION;
881 infof(data, "\t server certificate activation date FAILED\n");
884 infof(data, "\t server certificate activation date OK\n");
898 /* public key algorithm's parameters */
899 algo = gnutls_x509_crt_get_pk_algorithm(x509_cert, &bits);
900 infof(data, "\t certificate public key: %s\n",
901 gnutls_pk_algorithm_get_name(algo));
903 /* version of the X.509 certificate. */
904 infof(data, "\t certificate version: #%d\n",
905 gnutls_x509_crt_get_version(x509_cert));
908 size = sizeof(certbuf);
909 gnutls_x509_crt_get_dn(x509_cert, certbuf, &size);
910 infof(data, "\t subject: %s\n", certbuf);
912 certclock = gnutls_x509_crt_get_activation_time(x509_cert);
913 showtime(data, "start date", certclock);
915 certclock = gnutls_x509_crt_get_expiration_time(x509_cert);
916 showtime(data, "expire date", certclock);
918 size = sizeof(certbuf);
919 gnutls_x509_crt_get_issuer_dn(x509_cert, certbuf, &size);
920 infof(data, "\t issuer: %s\n", certbuf);
922 gnutls_x509_crt_deinit(x509_cert);
924 /* compression algorithm (if any) */
925 ptr = gnutls_compression_get_name(gnutls_compression_get(session));
926 /* the *_get_name() says "NULL" if GNUTLS_COMP_NULL is returned */
927 infof(data, "\t compression: %s\n", ptr);
929 /* the name of the cipher used. ie 3DES. */
930 ptr = gnutls_cipher_get_name(gnutls_cipher_get(session));
931 infof(data, "\t cipher: %s\n", ptr);
933 /* the MAC algorithms name. ie SHA1 */
934 ptr = gnutls_mac_get_name(gnutls_mac_get(session));
935 infof(data, "\t MAC: %s\n", ptr);
938 if(data->set.ssl_enable_alpn) {
939 rc = gnutls_alpn_get_selected_protocol(session, &proto);
941 infof(data, "ALPN, server accepted to use %.*s\n", proto.size,
944 if(proto.size == NGHTTP2_PROTO_VERSION_ID_LEN &&
945 memcmp(NGHTTP2_PROTO_VERSION_ID, proto.data,
946 NGHTTP2_PROTO_VERSION_ID_LEN) == 0) {
947 conn->negnpn = NPN_HTTP2;
949 else if(proto.size == ALPN_HTTP_1_1_LENGTH && memcmp(ALPN_HTTP_1_1,
950 proto.data, ALPN_HTTP_1_1_LENGTH) == 0) {
951 conn->negnpn = NPN_HTTP1_1;
955 infof(data, "ALPN, server did not agree to a protocol\n");
960 conn->ssl[sockindex].state = ssl_connection_complete;
961 conn->recv[sockindex] = gtls_recv;
962 conn->send[sockindex] = gtls_send;
965 /* we always unconditionally get the session id here, as even if we
966 already got it from the cache and asked to use it in the connection, it
967 might've been rejected and then a new one is in use now and we need to
969 void *connect_sessionid;
970 size_t connect_idsize = 0;
972 /* get the session ID data size */
973 gnutls_session_get_data(session, NULL, &connect_idsize);
974 connect_sessionid = malloc(connect_idsize); /* get a buffer for it */
976 if(connect_sessionid) {
977 /* extract session ID to the allocated buffer */
978 gnutls_session_get_data(session, connect_sessionid, &connect_idsize);
980 incache = !(Curl_ssl_getsessionid(conn, &ssl_sessionid, NULL));
982 /* there was one before in the cache, so instead of risking that the
983 previous one was rejected, we just kill that and store the new */
984 Curl_ssl_delsessionid(conn, ssl_sessionid);
987 /* store this session id */
988 result = Curl_ssl_addsessionid(conn, connect_sessionid, connect_idsize);
990 free(connect_sessionid);
991 result = CURLE_OUT_OF_MEMORY;
995 result = CURLE_OUT_OF_MEMORY;
1003 * This function is called after the TCP connect has completed. Setup the TLS
1004 * layer and do all necessary magic.
1006 /* We use connssl->connecting_state to keep track of the connection status;
1007 there are three states: 'ssl_connect_1' (not started yet or complete),
1008 'ssl_connect_2_reading' (waiting for data from server), and
1009 'ssl_connect_2_writing' (waiting to be able to write).
1012 gtls_connect_common(struct connectdata *conn,
1018 struct ssl_connect_data *connssl = &conn->ssl[sockindex];
1020 /* Initiate the connection, if not already done */
1021 if(ssl_connect_1==connssl->connecting_state) {
1022 rc = gtls_connect_step1 (conn, sockindex);
1027 rc = handshake(conn, sockindex, TRUE, nonblocking);
1029 /* handshake() sets its own error message with failf() */
1032 /* Finish connecting once the handshake is done */
1033 if(ssl_connect_1==connssl->connecting_state) {
1034 rc = gtls_connect_step3(conn, sockindex);
1039 *done = ssl_connect_1==connssl->connecting_state;
1045 Curl_gtls_connect_nonblocking(struct connectdata *conn,
1049 return gtls_connect_common(conn, sockindex, TRUE, done);
1053 Curl_gtls_connect(struct connectdata *conn,
1060 retcode = gtls_connect_common(conn, sockindex, FALSE, &done);
1069 static ssize_t gtls_send(struct connectdata *conn,
1075 ssize_t rc = gnutls_record_send(conn->ssl[sockindex].session, mem, len);
1078 *curlcode = (rc == GNUTLS_E_AGAIN)
1088 void Curl_gtls_close_all(struct SessionHandle *data)
1090 /* FIX: make the OpenSSL code more generic and use parts of it here */
1094 static void close_one(struct connectdata *conn,
1097 if(conn->ssl[idx].session) {
1098 gnutls_bye(conn->ssl[idx].session, GNUTLS_SHUT_RDWR);
1099 gnutls_deinit(conn->ssl[idx].session);
1100 conn->ssl[idx].session = NULL;
1102 if(conn->ssl[idx].cred) {
1103 gnutls_certificate_free_credentials(conn->ssl[idx].cred);
1104 conn->ssl[idx].cred = NULL;
1107 if(conn->ssl[idx].srp_client_cred) {
1108 gnutls_srp_free_client_credentials(conn->ssl[idx].srp_client_cred);
1109 conn->ssl[idx].srp_client_cred = NULL;
1114 void Curl_gtls_close(struct connectdata *conn, int sockindex)
1116 close_one(conn, sockindex);
1120 * This function is called to shut down the SSL layer but keep the
1121 * socket open (CCC - Clear Command Channel)
1123 int Curl_gtls_shutdown(struct connectdata *conn, int sockindex)
1127 struct SessionHandle *data = conn->data;
1131 /* This has only been tested on the proftpd server, and the mod_tls code
1132 sends a close notify alert without waiting for a close notify alert in
1133 response. Thus we wait for a close notify alert from the server, but
1134 we do not send one. Let's hope other servers do the same... */
1136 if(data->set.ftp_ccc == CURLFTPSSL_CCC_ACTIVE)
1137 gnutls_bye(conn->ssl[sockindex].session, GNUTLS_SHUT_WR);
1139 if(conn->ssl[sockindex].session) {
1141 int what = Curl_socket_ready(conn->sock[sockindex],
1142 CURL_SOCKET_BAD, SSL_SHUTDOWN_TIMEOUT);
1144 /* Something to read, let's do it and hope that it is the close
1145 notify alert from the server */
1146 result = gnutls_record_recv(conn->ssl[sockindex].session,
1150 /* This is the expected response. There was no data but only
1151 the close notify alert */
1154 case GNUTLS_E_AGAIN:
1155 case GNUTLS_E_INTERRUPTED:
1156 infof(data, "GNUTLS_E_AGAIN || GNUTLS_E_INTERRUPTED\n");
1164 else if(0 == what) {
1166 failf(data, "SSL shutdown timeout");
1171 /* anything that gets here is fatally bad */
1172 failf(data, "select/poll on SSL socket, errno: %d", SOCKERRNO);
1177 gnutls_deinit(conn->ssl[sockindex].session);
1179 gnutls_certificate_free_credentials(conn->ssl[sockindex].cred);
1182 if(data->set.ssl.authtype == CURL_TLSAUTH_SRP
1183 && data->set.ssl.username != NULL)
1184 gnutls_srp_free_client_credentials(conn->ssl[sockindex].srp_client_cred);
1187 conn->ssl[sockindex].cred = NULL;
1188 conn->ssl[sockindex].session = NULL;
1193 static ssize_t gtls_recv(struct connectdata *conn, /* connection data */
1194 int num, /* socketindex */
1195 char *buf, /* store read data here */
1196 size_t buffersize, /* max amount to read */
1201 ret = gnutls_record_recv(conn->ssl[num].session, buf, buffersize);
1202 if((ret == GNUTLS_E_AGAIN) || (ret == GNUTLS_E_INTERRUPTED)) {
1203 *curlcode = CURLE_AGAIN;
1207 if(ret == GNUTLS_E_REHANDSHAKE) {
1208 /* BLOCKING call, this is bad but a work-around for now. Fixing this "the
1209 proper way" takes a whole lot of work. */
1210 CURLcode rc = handshake(conn, num, FALSE, FALSE);
1212 /* handshake() writes error message on its own */
1215 *curlcode = CURLE_AGAIN; /* then return as if this was a wouldblock */
1220 failf(conn->data, "GnuTLS recv error (%d): %s",
1221 (int)ret, gnutls_strerror((int)ret));
1222 *curlcode = CURLE_RECV_ERROR;
1229 void Curl_gtls_session_free(void *ptr)
1234 size_t Curl_gtls_version(char *buffer, size_t size)
1236 return snprintf(buffer, size, "GnuTLS/%s", gnutls_check_version(NULL));
1239 int Curl_gtls_seed(struct SessionHandle *data)
1241 /* we have the "SSL is seeded" boolean static to prevent multiple
1242 time-consuming seedings in vain */
1243 static bool ssl_seeded = FALSE;
1245 /* Quickly add a bit of entropy */
1246 #ifndef USE_GNUTLS_NETTLE
1247 gcry_fast_random_poll();
1250 if(!ssl_seeded || data->set.str[STRING_SSL_RANDOM_FILE] ||
1251 data->set.str[STRING_SSL_EGDSOCKET]) {
1253 /* TODO: to a good job seeding the RNG
1254 This may involve the gcry_control function and these options:
1255 GCRYCTL_SET_RANDOM_SEED_FILE
1256 GCRYCTL_SET_RNDEGD_SOCKET
1263 void Curl_gtls_random(struct SessionHandle *data,
1264 unsigned char *entropy,
1267 #if defined(USE_GNUTLS_NETTLE)
1269 gnutls_rnd(GNUTLS_RND_RANDOM, entropy, length);
1270 #elif defined(USE_GNUTLS)
1271 Curl_gtls_seed(data); /* Initiate the seed if not already done */
1272 gcry_randomize(entropy, length, GCRY_STRONG_RANDOM);
1276 void Curl_gtls_md5sum(unsigned char *tmp, /* input */
1278 unsigned char *md5sum, /* output */
1281 #if defined(USE_GNUTLS_NETTLE)
1282 struct md5_ctx MD5pw;
1284 md5_update(&MD5pw, (unsigned int)tmplen, tmp);
1285 md5_digest(&MD5pw, (unsigned int)md5len, md5sum);
1286 #elif defined(USE_GNUTLS)
1288 gcry_md_open(&MD5pw, GCRY_MD_MD5, 0);
1289 gcry_md_write(MD5pw, tmp, tmplen);
1290 memcpy(md5sum, gcry_md_read (MD5pw, 0), md5len);
1291 gcry_md_close(MD5pw);
1295 #endif /* USE_GNUTLS */