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 /* If GnuTLS was compiled without support for SRP it will error out if SRP is
389 requested in the priority string, so treat it specially
391 #define GNUTLS_SRP "+SRP"
392 const char* prioritylist;
393 const char *err = NULL;
396 int protocols_size = 2;
397 gnutls_datum_t protocols[2];
400 if(conn->ssl[sockindex].state == ssl_connection_complete)
401 /* to make us tolerant against being called more than once for the
408 /* GnuTLS only supports SSLv3 and TLSv1 */
409 if(data->set.ssl.version == CURL_SSLVERSION_SSLv2) {
410 failf(data, "GnuTLS does not support SSLv2");
411 return CURLE_SSL_CONNECT_ERROR;
413 else if(data->set.ssl.version == CURL_SSLVERSION_SSLv3)
414 sni = FALSE; /* SSLv3 has no SNI */
416 /* allocate a cred struct */
417 rc = gnutls_certificate_allocate_credentials(&conn->ssl[sockindex].cred);
418 if(rc != GNUTLS_E_SUCCESS) {
419 failf(data, "gnutls_cert_all_cred() failed: %s", gnutls_strerror(rc));
420 return CURLE_SSL_CONNECT_ERROR;
424 if(data->set.ssl.authtype == CURL_TLSAUTH_SRP) {
425 infof(data, "Using TLS-SRP username: %s\n", data->set.ssl.username);
427 rc = gnutls_srp_allocate_client_credentials(
428 &conn->ssl[sockindex].srp_client_cred);
429 if(rc != GNUTLS_E_SUCCESS) {
430 failf(data, "gnutls_srp_allocate_client_cred() failed: %s",
431 gnutls_strerror(rc));
432 return CURLE_OUT_OF_MEMORY;
435 rc = gnutls_srp_set_client_credentials(conn->ssl[sockindex].
437 data->set.ssl.username,
438 data->set.ssl.password);
439 if(rc != GNUTLS_E_SUCCESS) {
440 failf(data, "gnutls_srp_set_client_cred() failed: %s",
441 gnutls_strerror(rc));
442 return CURLE_BAD_FUNCTION_ARGUMENT;
447 if(data->set.ssl.CAfile) {
448 /* set the trusted CA cert bundle file */
449 gnutls_certificate_set_verify_flags(conn->ssl[sockindex].cred,
450 GNUTLS_VERIFY_ALLOW_X509_V1_CA_CRT);
452 rc = gnutls_certificate_set_x509_trust_file(conn->ssl[sockindex].cred,
453 data->set.ssl.CAfile,
454 GNUTLS_X509_FMT_PEM);
456 infof(data, "error reading ca cert file %s (%s)\n",
457 data->set.ssl.CAfile, gnutls_strerror(rc));
458 if(data->set.ssl.verifypeer)
459 return CURLE_SSL_CACERT_BADFILE;
462 infof(data, "found %d certificates in %s\n",
463 rc, data->set.ssl.CAfile);
466 if(data->set.ssl.CRLfile) {
467 /* set the CRL list file */
468 rc = gnutls_certificate_set_x509_crl_file(conn->ssl[sockindex].cred,
469 data->set.ssl.CRLfile,
470 GNUTLS_X509_FMT_PEM);
472 failf(data, "error reading crl file %s (%s)",
473 data->set.ssl.CRLfile, gnutls_strerror(rc));
474 return CURLE_SSL_CRL_BADFILE;
477 infof(data, "found %d CRL in %s\n",
478 rc, data->set.ssl.CRLfile);
481 /* Initialize TLS session as a client */
482 rc = gnutls_init(&conn->ssl[sockindex].session, GNUTLS_CLIENT);
483 if(rc != GNUTLS_E_SUCCESS) {
484 failf(data, "gnutls_init() failed: %d", rc);
485 return CURLE_SSL_CONNECT_ERROR;
488 /* convenient assign */
489 session = conn->ssl[sockindex].session;
491 if((0 == Curl_inet_pton(AF_INET, conn->host.name, &addr)) &&
493 (0 == Curl_inet_pton(AF_INET6, conn->host.name, &addr)) &&
496 (gnutls_server_name_set(session, GNUTLS_NAME_DNS, conn->host.name,
497 strlen(conn->host.name)) < 0))
498 infof(data, "WARNING: failed to configure server name indication (SNI) "
501 /* Use default priorities */
502 rc = gnutls_set_default_priority(session);
503 if(rc != GNUTLS_E_SUCCESS)
504 return CURLE_SSL_CONNECT_ERROR;
506 #ifndef USE_GNUTLS_PRIORITY_SET_DIRECT
507 rc = gnutls_cipher_set_priority(session, cipher_priority);
508 if(rc != GNUTLS_E_SUCCESS)
509 return CURLE_SSL_CONNECT_ERROR;
511 /* Sets the priority on the certificate types supported by gnutls. Priority
512 is higher for types specified before others. After specifying the types
513 you want, you must append a 0. */
514 rc = gnutls_certificate_type_set_priority(session, cert_type_priority);
515 if(rc != GNUTLS_E_SUCCESS)
516 return CURLE_SSL_CONNECT_ERROR;
518 if(data->set.ssl.cipher_list != NULL) {
519 failf(data, "can't pass a custom cipher list to older GnuTLS"
521 return CURLE_SSL_CONNECT_ERROR;
524 switch (data->set.ssl.version) {
525 case CURL_SSLVERSION_SSLv3:
526 protocol_priority[0] = GNUTLS_SSL3;
528 case CURL_SSLVERSION_DEFAULT:
529 case CURL_SSLVERSION_TLSv1:
530 protocol_priority[0] = GNUTLS_TLS1_0;
531 protocol_priority[1] = GNUTLS_TLS1_1;
532 protocol_priority[2] = GNUTLS_TLS1_2;
534 case CURL_SSLVERSION_TLSv1_0:
535 protocol_priority[0] = GNUTLS_TLS1_0;
537 case CURL_SSLVERSION_TLSv1_1:
538 protocol_priority[0] = GNUTLS_TLS1_1;
540 case CURL_SSLVERSION_TLSv1_2:
541 protocol_priority[0] = GNUTLS_TLS1_2;
543 case CURL_SSLVERSION_SSLv2:
545 failf(data, "GnuTLS does not support SSLv2");
546 return CURLE_SSL_CONNECT_ERROR;
549 rc = gnutls_protocol_set_priority(session, protocol_priority);
550 if(rc != GNUTLS_E_SUCCESS) {
551 failf(data, "Did you pass a valid GnuTLS cipher list?");
552 return CURLE_SSL_CONNECT_ERROR;
556 /* Ensure +SRP comes at the *end* of all relevant strings so that it can be
557 * removed if a run-time error indicates that SRP is not supported by this
559 switch (data->set.ssl.version) {
560 case CURL_SSLVERSION_SSLv3:
561 prioritylist = GNUTLS_CIPHERS ":-VERS-TLS-ALL:+VERS-SSL3.0";
564 case CURL_SSLVERSION_DEFAULT:
565 case CURL_SSLVERSION_TLSv1:
566 prioritylist = GNUTLS_CIPHERS ":-VERS-SSL3.0:" GNUTLS_SRP;
568 case CURL_SSLVERSION_TLSv1_0:
569 prioritylist = GNUTLS_CIPHERS ":-VERS-SSL3.0:-VERS-TLS-ALL:"
570 "+VERS-TLS1.0:" GNUTLS_SRP;
572 case CURL_SSLVERSION_TLSv1_1:
573 prioritylist = GNUTLS_CIPHERS ":-VERS-SSL3.0:-VERS-TLS-ALL:"
574 "+VERS-TLS1.1:" GNUTLS_SRP;
576 case CURL_SSLVERSION_TLSv1_2:
577 prioritylist = GNUTLS_CIPHERS ":-VERS-SSL3.0:-VERS-TLS-ALL:"
578 "+VERS-TLS1.2:" GNUTLS_SRP;
580 case CURL_SSLVERSION_SSLv2:
582 failf(data, "GnuTLS does not support SSLv2");
583 return CURLE_SSL_CONNECT_ERROR;
586 rc = gnutls_priority_set_direct(session, prioritylist, &err);
587 if((rc == GNUTLS_E_INVALID_REQUEST) && err) {
588 if(!strcmp(err, GNUTLS_SRP)) {
589 /* This GnuTLS was probably compiled without support for SRP.
590 * Note that fact and try again without it. */
591 int validprioritylen = err - prioritylist;
592 char *prioritycopy = strdup(prioritylist);
594 return CURLE_OUT_OF_MEMORY;
596 infof(data, "This GnuTLS does not support SRP\n");
598 /* Remove the :+SRP */
599 prioritycopy[validprioritylen - 1] = 0;
600 rc = gnutls_priority_set_direct(session, prioritycopy, &err);
604 if(rc != GNUTLS_E_SUCCESS) {
605 failf(data, "Error %d setting GnuTLS cipher list starting with %s",
607 return CURLE_SSL_CONNECT_ERROR;
612 if(data->set.httpversion == CURL_HTTP_VERSION_2_0) {
613 if(data->set.ssl_enable_alpn) {
614 protocols[0].data = NGHTTP2_PROTO_VERSION_ID;
615 protocols[0].size = NGHTTP2_PROTO_VERSION_ID_LEN;
616 protocols[1].data = ALPN_HTTP_1_1;
617 protocols[1].size = ALPN_HTTP_1_1_LENGTH;
618 gnutls_alpn_set_protocols(session, protocols, protocols_size, 0);
619 infof(data, "ALPN, offering %s, %s\n", NGHTTP2_PROTO_VERSION_ID,
623 infof(data, "SSL, can't negotiate HTTP/2.0 without ALPN\n");
628 if(data->set.str[STRING_CERT]) {
629 if(gnutls_certificate_set_x509_key_file(
630 conn->ssl[sockindex].cred,
631 data->set.str[STRING_CERT],
632 data->set.str[STRING_KEY] ?
633 data->set.str[STRING_KEY] : data->set.str[STRING_CERT],
634 do_file_type(data->set.str[STRING_CERT_TYPE]) ) !=
636 failf(data, "error reading X.509 key or certificate file");
637 return CURLE_SSL_CONNECT_ERROR;
642 /* put the credentials to the current session */
643 if(data->set.ssl.authtype == CURL_TLSAUTH_SRP) {
644 rc = gnutls_credentials_set(session, GNUTLS_CRD_SRP,
645 conn->ssl[sockindex].srp_client_cred);
646 if(rc != GNUTLS_E_SUCCESS)
647 failf(data, "gnutls_credentials_set() failed: %s", gnutls_strerror(rc));
651 rc = gnutls_credentials_set(session, GNUTLS_CRD_CERTIFICATE,
652 conn->ssl[sockindex].cred);
654 /* set the connection handle (file descriptor for the socket) */
655 gnutls_transport_set_ptr(session,
656 GNUTLS_INT_TO_POINTER_CAST(conn->sock[sockindex]));
658 /* register callback functions to send and receive data. */
659 gnutls_transport_set_push_function(session, Curl_gtls_push);
660 gnutls_transport_set_pull_function(session, Curl_gtls_pull);
662 /* lowat must be set to zero when using custom push and pull functions. */
663 gnutls_transport_set_lowat(session, 0);
665 /* This might be a reconnect, so we check for a session ID in the cache
666 to speed up things */
668 if(!Curl_ssl_getsessionid(conn, &ssl_sessionid, &ssl_idsize)) {
669 /* we got a session id, use it! */
670 gnutls_session_set_data(session, ssl_sessionid, ssl_idsize);
672 /* Informational message */
673 infof (data, "SSL re-using session ID\n");
679 static Curl_recv gtls_recv;
680 static Curl_send gtls_send;
683 gtls_connect_step3(struct connectdata *conn,
686 unsigned int cert_list_size;
687 const gnutls_datum_t *chainp;
688 unsigned int verify_status;
689 gnutls_x509_crt_t x509_cert,x509_issuer;
690 gnutls_datum_t issuerp;
691 char certbuf[256] = ""; /* big enough? */
697 struct SessionHandle *data = conn->data;
698 gnutls_session_t session = conn->ssl[sockindex].session;
703 gnutls_datum_t proto;
705 CURLcode result = CURLE_OK;
707 /* This function will return the peer's raw certificate (chain) as sent by
708 the peer. These certificates are in raw format (DER encoded for
709 X.509). In case of a X.509 then a certificate list may be present. The
710 first certificate in the list is the peer's certificate, following the
711 issuer's certificate, then the issuer's issuer etc. */
713 chainp = gnutls_certificate_get_peers(session, &cert_list_size);
715 if(data->set.ssl.verifypeer ||
716 data->set.ssl.verifyhost ||
717 data->set.ssl.issuercert) {
719 if(data->set.ssl.authtype == CURL_TLSAUTH_SRP
720 && data->set.ssl.username != NULL
721 && !data->set.ssl.verifypeer
722 && gnutls_cipher_get(session)) {
723 /* no peer cert, but auth is ok if we have SRP user and cipher and no
728 failf(data, "failed to get server cert");
729 return CURLE_PEER_FAILED_VERIFICATION;
734 infof(data, "\t common name: WARNING couldn't obtain\n");
737 if(data->set.ssl.verifypeer) {
738 /* This function will try to verify the peer's certificate and return its
739 status (trusted, invalid etc.). The value of status should be one or
740 more of the gnutls_certificate_status_t enumerated elements bitwise
741 or'd. To avoid denial of service attacks some default upper limits
742 regarding the certificate key size and chain size are set. To override
743 them use gnutls_certificate_set_verify_limits(). */
745 rc = gnutls_certificate_verify_peers2(session, &verify_status);
747 failf(data, "server cert verify failed: %d", rc);
748 return CURLE_SSL_CONNECT_ERROR;
751 /* verify_status is a bitmask of gnutls_certificate_status bits */
752 if(verify_status & GNUTLS_CERT_INVALID) {
753 if(data->set.ssl.verifypeer) {
754 failf(data, "server certificate verification failed. CAfile: %s "
755 "CRLfile: %s", data->set.ssl.CAfile?data->set.ssl.CAfile:"none",
756 data->set.ssl.CRLfile?data->set.ssl.CRLfile:"none");
757 return CURLE_SSL_CACERT;
760 infof(data, "\t server certificate verification FAILED\n");
763 infof(data, "\t server certificate verification OK\n");
766 infof(data, "\t server certificate verification SKIPPED\n");
768 /* initialize an X.509 certificate structure. */
769 gnutls_x509_crt_init(&x509_cert);
772 /* convert the given DER or PEM encoded Certificate to the native
773 gnutls_x509_crt_t format */
774 gnutls_x509_crt_import(x509_cert, chainp, GNUTLS_X509_FMT_DER);
776 if(data->set.ssl.issuercert) {
777 gnutls_x509_crt_init(&x509_issuer);
778 issuerp = load_file(data->set.ssl.issuercert);
779 gnutls_x509_crt_import(x509_issuer, &issuerp, GNUTLS_X509_FMT_PEM);
780 rc = gnutls_x509_crt_check_issuer(x509_cert,x509_issuer);
781 unload_file(issuerp);
783 failf(data, "server certificate issuer check failed (IssuerCert: %s)",
784 data->set.ssl.issuercert?data->set.ssl.issuercert:"none");
785 return CURLE_SSL_ISSUER_ERROR;
787 infof(data,"\t server certificate issuer check OK (Issuer Cert: %s)\n",
788 data->set.ssl.issuercert?data->set.ssl.issuercert:"none");
791 size=sizeof(certbuf);
792 rc = gnutls_x509_crt_get_dn_by_oid(x509_cert, GNUTLS_OID_X520_COMMON_NAME,
793 0, /* the first and only one */
798 infof(data, "error fetching CN from cert:%s\n",
799 gnutls_strerror(rc));
802 /* This function will check if the given certificate's subject matches the
803 given hostname. This is a basic implementation of the matching described
804 in RFC2818 (HTTPS), which takes into account wildcards, and the subject
805 alternative name PKIX extension. Returns non zero on success, and zero on
807 rc = gnutls_x509_crt_check_hostname(x509_cert, conn->host.name);
808 #if GNUTLS_VERSION_NUMBER < 0x030306
809 /* Before 3.3.6, gnutls_x509_crt_check_hostname() didn't check IP
813 #define use_addr in6_addr
815 #define use_addr in_addr
817 unsigned char addrbuf[sizeof(struct use_addr)];
818 unsigned char certaddr[sizeof(struct use_addr)];
819 size_t addrlen = 0, certaddrlen;
823 if(Curl_inet_pton(AF_INET, conn->host.name, addrbuf) > 0)
826 else if(Curl_inet_pton(AF_INET6, conn->host.name, addrbuf) > 0)
832 certaddrlen = sizeof(certaddr);
833 ret = gnutls_x509_crt_get_subject_alt_name(x509_cert, i, certaddr,
835 /* If this happens, it wasn't an IP address. */
836 if(ret == GNUTLS_E_SHORT_MEMORY_BUFFER)
840 if(ret != GNUTLS_SAN_IPADDRESS)
842 if(certaddrlen == addrlen && !memcmp(addrbuf, certaddr, addrlen)) {
851 if(data->set.ssl.verifyhost) {
852 failf(data, "SSL: certificate subject name (%s) does not match "
853 "target host name '%s'", certbuf, conn->host.dispname);
854 gnutls_x509_crt_deinit(x509_cert);
855 return CURLE_PEER_FAILED_VERIFICATION;
858 infof(data, "\t common name: %s (does not match '%s')\n",
859 certbuf, conn->host.dispname);
862 infof(data, "\t common name: %s (matched)\n", certbuf);
864 /* Check for time-based validity */
865 certclock = gnutls_x509_crt_get_expiration_time(x509_cert);
867 if(certclock == (time_t)-1) {
868 if(data->set.ssl.verifypeer) {
869 failf(data, "server cert expiration date verify failed");
870 return CURLE_SSL_CONNECT_ERROR;
873 infof(data, "\t server certificate expiration date verify FAILED\n");
876 if(certclock < time(NULL)) {
877 if(data->set.ssl.verifypeer) {
878 failf(data, "server certificate expiration date has passed.");
879 return CURLE_PEER_FAILED_VERIFICATION;
882 infof(data, "\t server certificate expiration date FAILED\n");
885 infof(data, "\t server certificate expiration date OK\n");
888 certclock = gnutls_x509_crt_get_activation_time(x509_cert);
890 if(certclock == (time_t)-1) {
891 if(data->set.ssl.verifypeer) {
892 failf(data, "server cert activation date verify failed");
893 return CURLE_SSL_CONNECT_ERROR;
896 infof(data, "\t server certificate activation date verify FAILED\n");
899 if(certclock > time(NULL)) {
900 if(data->set.ssl.verifypeer) {
901 failf(data, "server certificate not activated yet.");
902 return CURLE_PEER_FAILED_VERIFICATION;
905 infof(data, "\t server certificate activation date FAILED\n");
908 infof(data, "\t server certificate activation date OK\n");
922 /* public key algorithm's parameters */
923 algo = gnutls_x509_crt_get_pk_algorithm(x509_cert, &bits);
924 infof(data, "\t certificate public key: %s\n",
925 gnutls_pk_algorithm_get_name(algo));
927 /* version of the X.509 certificate. */
928 infof(data, "\t certificate version: #%d\n",
929 gnutls_x509_crt_get_version(x509_cert));
932 size = sizeof(certbuf);
933 gnutls_x509_crt_get_dn(x509_cert, certbuf, &size);
934 infof(data, "\t subject: %s\n", certbuf);
936 certclock = gnutls_x509_crt_get_activation_time(x509_cert);
937 showtime(data, "start date", certclock);
939 certclock = gnutls_x509_crt_get_expiration_time(x509_cert);
940 showtime(data, "expire date", certclock);
942 size = sizeof(certbuf);
943 gnutls_x509_crt_get_issuer_dn(x509_cert, certbuf, &size);
944 infof(data, "\t issuer: %s\n", certbuf);
946 gnutls_x509_crt_deinit(x509_cert);
948 /* compression algorithm (if any) */
949 ptr = gnutls_compression_get_name(gnutls_compression_get(session));
950 /* the *_get_name() says "NULL" if GNUTLS_COMP_NULL is returned */
951 infof(data, "\t compression: %s\n", ptr);
953 /* the name of the cipher used. ie 3DES. */
954 ptr = gnutls_cipher_get_name(gnutls_cipher_get(session));
955 infof(data, "\t cipher: %s\n", ptr);
957 /* the MAC algorithms name. ie SHA1 */
958 ptr = gnutls_mac_get_name(gnutls_mac_get(session));
959 infof(data, "\t MAC: %s\n", ptr);
962 if(data->set.ssl_enable_alpn) {
963 rc = gnutls_alpn_get_selected_protocol(session, &proto);
965 infof(data, "ALPN, server accepted to use %.*s\n", proto.size,
968 if(proto.size == NGHTTP2_PROTO_VERSION_ID_LEN &&
969 memcmp(NGHTTP2_PROTO_VERSION_ID, proto.data,
970 NGHTTP2_PROTO_VERSION_ID_LEN) == 0) {
971 conn->negnpn = NPN_HTTP2;
973 else if(proto.size == ALPN_HTTP_1_1_LENGTH && memcmp(ALPN_HTTP_1_1,
974 proto.data, ALPN_HTTP_1_1_LENGTH) == 0) {
975 conn->negnpn = NPN_HTTP1_1;
979 infof(data, "ALPN, server did not agree to a protocol\n");
984 conn->ssl[sockindex].state = ssl_connection_complete;
985 conn->recv[sockindex] = gtls_recv;
986 conn->send[sockindex] = gtls_send;
989 /* we always unconditionally get the session id here, as even if we
990 already got it from the cache and asked to use it in the connection, it
991 might've been rejected and then a new one is in use now and we need to
993 void *connect_sessionid;
994 size_t connect_idsize = 0;
996 /* get the session ID data size */
997 gnutls_session_get_data(session, NULL, &connect_idsize);
998 connect_sessionid = malloc(connect_idsize); /* get a buffer for it */
1000 if(connect_sessionid) {
1001 /* extract session ID to the allocated buffer */
1002 gnutls_session_get_data(session, connect_sessionid, &connect_idsize);
1004 incache = !(Curl_ssl_getsessionid(conn, &ssl_sessionid, NULL));
1006 /* there was one before in the cache, so instead of risking that the
1007 previous one was rejected, we just kill that and store the new */
1008 Curl_ssl_delsessionid(conn, ssl_sessionid);
1011 /* store this session id */
1012 result = Curl_ssl_addsessionid(conn, connect_sessionid, connect_idsize);
1014 free(connect_sessionid);
1015 result = CURLE_OUT_OF_MEMORY;
1019 result = CURLE_OUT_OF_MEMORY;
1027 * This function is called after the TCP connect has completed. Setup the TLS
1028 * layer and do all necessary magic.
1030 /* We use connssl->connecting_state to keep track of the connection status;
1031 there are three states: 'ssl_connect_1' (not started yet or complete),
1032 'ssl_connect_2_reading' (waiting for data from server), and
1033 'ssl_connect_2_writing' (waiting to be able to write).
1036 gtls_connect_common(struct connectdata *conn,
1042 struct ssl_connect_data *connssl = &conn->ssl[sockindex];
1044 /* Initiate the connection, if not already done */
1045 if(ssl_connect_1==connssl->connecting_state) {
1046 rc = gtls_connect_step1 (conn, sockindex);
1051 rc = handshake(conn, sockindex, TRUE, nonblocking);
1053 /* handshake() sets its own error message with failf() */
1056 /* Finish connecting once the handshake is done */
1057 if(ssl_connect_1==connssl->connecting_state) {
1058 rc = gtls_connect_step3(conn, sockindex);
1063 *done = ssl_connect_1==connssl->connecting_state;
1069 Curl_gtls_connect_nonblocking(struct connectdata *conn,
1073 return gtls_connect_common(conn, sockindex, TRUE, done);
1077 Curl_gtls_connect(struct connectdata *conn,
1084 retcode = gtls_connect_common(conn, sockindex, FALSE, &done);
1093 static ssize_t gtls_send(struct connectdata *conn,
1099 ssize_t rc = gnutls_record_send(conn->ssl[sockindex].session, mem, len);
1102 *curlcode = (rc == GNUTLS_E_AGAIN)
1112 void Curl_gtls_close_all(struct SessionHandle *data)
1114 /* FIX: make the OpenSSL code more generic and use parts of it here */
1118 static void close_one(struct connectdata *conn,
1121 if(conn->ssl[idx].session) {
1122 gnutls_bye(conn->ssl[idx].session, GNUTLS_SHUT_RDWR);
1123 gnutls_deinit(conn->ssl[idx].session);
1124 conn->ssl[idx].session = NULL;
1126 if(conn->ssl[idx].cred) {
1127 gnutls_certificate_free_credentials(conn->ssl[idx].cred);
1128 conn->ssl[idx].cred = NULL;
1131 if(conn->ssl[idx].srp_client_cred) {
1132 gnutls_srp_free_client_credentials(conn->ssl[idx].srp_client_cred);
1133 conn->ssl[idx].srp_client_cred = NULL;
1138 void Curl_gtls_close(struct connectdata *conn, int sockindex)
1140 close_one(conn, sockindex);
1144 * This function is called to shut down the SSL layer but keep the
1145 * socket open (CCC - Clear Command Channel)
1147 int Curl_gtls_shutdown(struct connectdata *conn, int sockindex)
1151 struct SessionHandle *data = conn->data;
1155 /* This has only been tested on the proftpd server, and the mod_tls code
1156 sends a close notify alert without waiting for a close notify alert in
1157 response. Thus we wait for a close notify alert from the server, but
1158 we do not send one. Let's hope other servers do the same... */
1160 if(data->set.ftp_ccc == CURLFTPSSL_CCC_ACTIVE)
1161 gnutls_bye(conn->ssl[sockindex].session, GNUTLS_SHUT_WR);
1163 if(conn->ssl[sockindex].session) {
1165 int what = Curl_socket_ready(conn->sock[sockindex],
1166 CURL_SOCKET_BAD, SSL_SHUTDOWN_TIMEOUT);
1168 /* Something to read, let's do it and hope that it is the close
1169 notify alert from the server */
1170 result = gnutls_record_recv(conn->ssl[sockindex].session,
1174 /* This is the expected response. There was no data but only
1175 the close notify alert */
1178 case GNUTLS_E_AGAIN:
1179 case GNUTLS_E_INTERRUPTED:
1180 infof(data, "GNUTLS_E_AGAIN || GNUTLS_E_INTERRUPTED\n");
1188 else if(0 == what) {
1190 failf(data, "SSL shutdown timeout");
1195 /* anything that gets here is fatally bad */
1196 failf(data, "select/poll on SSL socket, errno: %d", SOCKERRNO);
1201 gnutls_deinit(conn->ssl[sockindex].session);
1203 gnutls_certificate_free_credentials(conn->ssl[sockindex].cred);
1206 if(data->set.ssl.authtype == CURL_TLSAUTH_SRP
1207 && data->set.ssl.username != NULL)
1208 gnutls_srp_free_client_credentials(conn->ssl[sockindex].srp_client_cred);
1211 conn->ssl[sockindex].cred = NULL;
1212 conn->ssl[sockindex].session = NULL;
1217 static ssize_t gtls_recv(struct connectdata *conn, /* connection data */
1218 int num, /* socketindex */
1219 char *buf, /* store read data here */
1220 size_t buffersize, /* max amount to read */
1225 ret = gnutls_record_recv(conn->ssl[num].session, buf, buffersize);
1226 if((ret == GNUTLS_E_AGAIN) || (ret == GNUTLS_E_INTERRUPTED)) {
1227 *curlcode = CURLE_AGAIN;
1231 if(ret == GNUTLS_E_REHANDSHAKE) {
1232 /* BLOCKING call, this is bad but a work-around for now. Fixing this "the
1233 proper way" takes a whole lot of work. */
1234 CURLcode rc = handshake(conn, num, FALSE, FALSE);
1236 /* handshake() writes error message on its own */
1239 *curlcode = CURLE_AGAIN; /* then return as if this was a wouldblock */
1244 failf(conn->data, "GnuTLS recv error (%d): %s",
1245 (int)ret, gnutls_strerror((int)ret));
1246 *curlcode = CURLE_RECV_ERROR;
1253 void Curl_gtls_session_free(void *ptr)
1258 size_t Curl_gtls_version(char *buffer, size_t size)
1260 return snprintf(buffer, size, "GnuTLS/%s", gnutls_check_version(NULL));
1263 int Curl_gtls_seed(struct SessionHandle *data)
1265 /* we have the "SSL is seeded" boolean static to prevent multiple
1266 time-consuming seedings in vain */
1267 static bool ssl_seeded = FALSE;
1269 /* Quickly add a bit of entropy */
1270 #ifndef USE_GNUTLS_NETTLE
1271 gcry_fast_random_poll();
1274 if(!ssl_seeded || data->set.str[STRING_SSL_RANDOM_FILE] ||
1275 data->set.str[STRING_SSL_EGDSOCKET]) {
1277 /* TODO: to a good job seeding the RNG
1278 This may involve the gcry_control function and these options:
1279 GCRYCTL_SET_RANDOM_SEED_FILE
1280 GCRYCTL_SET_RNDEGD_SOCKET
1287 void Curl_gtls_random(struct SessionHandle *data,
1288 unsigned char *entropy,
1291 #if defined(USE_GNUTLS_NETTLE)
1293 gnutls_rnd(GNUTLS_RND_RANDOM, entropy, length);
1294 #elif defined(USE_GNUTLS)
1295 Curl_gtls_seed(data); /* Initiate the seed if not already done */
1296 gcry_randomize(entropy, length, GCRY_STRONG_RANDOM);
1300 void Curl_gtls_md5sum(unsigned char *tmp, /* input */
1302 unsigned char *md5sum, /* output */
1305 #if defined(USE_GNUTLS_NETTLE)
1306 struct md5_ctx MD5pw;
1308 md5_update(&MD5pw, (unsigned int)tmplen, tmp);
1309 md5_digest(&MD5pw, (unsigned int)md5len, md5sum);
1310 #elif defined(USE_GNUTLS)
1312 gcry_md_open(&MD5pw, GCRY_MD_MD5, 0);
1313 gcry_md_write(MD5pw, tmp, tmplen);
1314 memcpy(md5sum, gcry_md_read (MD5pw, 0), md5len);
1315 gcry_md_close(MD5pw);
1319 #endif /* USE_GNUTLS */