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 int cipher_priority[] = { GNUTLS_CIPHER_AES_128_GCM,
373 GNUTLS_CIPHER_AES_256_GCM, GNUTLS_CIPHER_AES_128_CBC,
374 GNUTLS_CIPHER_AES_256_CBC, GNUTLS_CIPHER_CAMELLIA_128_CBC,
375 GNUTLS_CIPHER_CAMELLIA_256_CBC, GNUTLS_CIPHER_3DES_CBC,
377 static const int cert_type_priority[] = { GNUTLS_CRT_X509, 0 };
378 static int protocol_priority[] = { 0, 0, 0, 0 };
380 #define GNUTLS_CIPHERS "NORMAL:-ARCFOUR-128:-CTYPE-ALL:+CTYPE-X509"
381 const char* prioritylist;
385 int protocols_size = 2;
386 gnutls_datum_t protocols[2];
389 if(conn->ssl[sockindex].state == ssl_connection_complete)
390 /* to make us tolerant against being called more than once for the
397 /* GnuTLS only supports SSLv3 and TLSv1 */
398 if(data->set.ssl.version == CURL_SSLVERSION_SSLv2) {
399 failf(data, "GnuTLS does not support SSLv2");
400 return CURLE_SSL_CONNECT_ERROR;
402 else if(data->set.ssl.version == CURL_SSLVERSION_SSLv3)
403 sni = FALSE; /* SSLv3 has no SNI */
405 /* allocate a cred struct */
406 rc = gnutls_certificate_allocate_credentials(&conn->ssl[sockindex].cred);
407 if(rc != GNUTLS_E_SUCCESS) {
408 failf(data, "gnutls_cert_all_cred() failed: %s", gnutls_strerror(rc));
409 return CURLE_SSL_CONNECT_ERROR;
413 if(data->set.ssl.authtype == CURL_TLSAUTH_SRP) {
414 infof(data, "Using TLS-SRP username: %s\n", data->set.ssl.username);
416 rc = gnutls_srp_allocate_client_credentials(
417 &conn->ssl[sockindex].srp_client_cred);
418 if(rc != GNUTLS_E_SUCCESS) {
419 failf(data, "gnutls_srp_allocate_client_cred() failed: %s",
420 gnutls_strerror(rc));
421 return CURLE_OUT_OF_MEMORY;
424 rc = gnutls_srp_set_client_credentials(conn->ssl[sockindex].
426 data->set.ssl.username,
427 data->set.ssl.password);
428 if(rc != GNUTLS_E_SUCCESS) {
429 failf(data, "gnutls_srp_set_client_cred() failed: %s",
430 gnutls_strerror(rc));
431 return CURLE_BAD_FUNCTION_ARGUMENT;
436 if(data->set.ssl.CAfile) {
437 /* set the trusted CA cert bundle file */
438 gnutls_certificate_set_verify_flags(conn->ssl[sockindex].cred,
439 GNUTLS_VERIFY_ALLOW_X509_V1_CA_CRT);
441 rc = gnutls_certificate_set_x509_trust_file(conn->ssl[sockindex].cred,
442 data->set.ssl.CAfile,
443 GNUTLS_X509_FMT_PEM);
445 infof(data, "error reading ca cert file %s (%s)\n",
446 data->set.ssl.CAfile, gnutls_strerror(rc));
447 if(data->set.ssl.verifypeer)
448 return CURLE_SSL_CACERT_BADFILE;
451 infof(data, "found %d certificates in %s\n",
452 rc, data->set.ssl.CAfile);
455 if(data->set.ssl.CRLfile) {
456 /* set the CRL list file */
457 rc = gnutls_certificate_set_x509_crl_file(conn->ssl[sockindex].cred,
458 data->set.ssl.CRLfile,
459 GNUTLS_X509_FMT_PEM);
461 failf(data, "error reading crl file %s (%s)",
462 data->set.ssl.CRLfile, gnutls_strerror(rc));
463 return CURLE_SSL_CRL_BADFILE;
466 infof(data, "found %d CRL in %s\n",
467 rc, data->set.ssl.CRLfile);
470 /* Initialize TLS session as a client */
471 rc = gnutls_init(&conn->ssl[sockindex].session, GNUTLS_CLIENT);
472 if(rc != GNUTLS_E_SUCCESS) {
473 failf(data, "gnutls_init() failed: %d", rc);
474 return CURLE_SSL_CONNECT_ERROR;
477 /* convenient assign */
478 session = conn->ssl[sockindex].session;
480 if((0 == Curl_inet_pton(AF_INET, conn->host.name, &addr)) &&
482 (0 == Curl_inet_pton(AF_INET6, conn->host.name, &addr)) &&
485 (gnutls_server_name_set(session, GNUTLS_NAME_DNS, conn->host.name,
486 strlen(conn->host.name)) < 0))
487 infof(data, "WARNING: failed to configure server name indication (SNI) "
490 /* Use default priorities */
491 rc = gnutls_set_default_priority(session);
492 if(rc != GNUTLS_E_SUCCESS)
493 return CURLE_SSL_CONNECT_ERROR;
495 #ifndef USE_GNUTLS_PRIORITY_SET_DIRECT
496 rc = gnutls_cipher_set_priority(session, cipher_priority);
497 if(rc != GNUTLS_E_SUCCESS)
498 return CURLE_SSL_CONNECT_ERROR;
500 /* Sets the priority on the certificate types supported by gnutls. Priority
501 is higher for types specified before others. After specifying the types
502 you want, you must append a 0. */
503 rc = gnutls_certificate_type_set_priority(session, cert_type_priority);
504 if(rc != GNUTLS_E_SUCCESS)
505 return CURLE_SSL_CONNECT_ERROR;
507 if(data->set.ssl.cipher_list != NULL) {
508 failf(data, "can't pass a custom cipher list to older GnuTLS"
510 return CURLE_SSL_CONNECT_ERROR;
513 switch (data->set.ssl.version) {
514 case CURL_SSLVERSION_SSLv3:
515 protocol_priority[0] = GNUTLS_SSL3;
517 case CURL_SSLVERSION_DEFAULT:
518 case CURL_SSLVERSION_TLSv1:
519 protocol_priority[0] = GNUTLS_TLS1_0;
520 protocol_priority[1] = GNUTLS_TLS1_1;
521 protocol_priority[2] = GNUTLS_TLS1_2;
523 case CURL_SSLVERSION_TLSv1_0:
524 protocol_priority[0] = GNUTLS_TLS1_0;
526 case CURL_SSLVERSION_TLSv1_1:
527 protocol_priority[0] = GNUTLS_TLS1_1;
529 case CURL_SSLVERSION_TLSv1_2:
530 protocol_priority[0] = GNUTLS_TLS1_2;
532 case CURL_SSLVERSION_SSLv2:
534 failf(data, "GnuTLS does not support SSLv2");
535 return CURLE_SSL_CONNECT_ERROR;
538 rc = gnutls_protocol_set_priority(session, protocol_priority);
540 switch (data->set.ssl.version) {
541 case CURL_SSLVERSION_SSLv3:
542 prioritylist = GNUTLS_CIPHERS ":-VERS-TLS-ALL:+VERS-SSL3.0";
545 case CURL_SSLVERSION_DEFAULT:
546 case CURL_SSLVERSION_TLSv1:
547 prioritylist = GNUTLS_CIPHERS ":-VERS-SSL3.0";
549 case CURL_SSLVERSION_TLSv1_0:
550 prioritylist = GNUTLS_CIPHERS ":-VERS-SSL3.0:-VERS-TLS-ALL:"
553 case CURL_SSLVERSION_TLSv1_1:
554 prioritylist = GNUTLS_CIPHERS ":-VERS-SSL3.0:-VERS-TLS-ALL:"
557 case CURL_SSLVERSION_TLSv1_2:
558 prioritylist = GNUTLS_CIPHERS ":-VERS-SSL3.0:-VERS-TLS-ALL:"
561 case CURL_SSLVERSION_SSLv2:
563 failf(data, "GnuTLS does not support SSLv2");
564 return CURLE_SSL_CONNECT_ERROR;
567 rc = gnutls_priority_set_direct(session, prioritylist, &err);
571 if(data->set.httpversion == CURL_HTTP_VERSION_2_0) {
572 if(data->set.ssl_enable_alpn) {
573 protocols[0].data = NGHTTP2_PROTO_VERSION_ID;
574 protocols[0].size = NGHTTP2_PROTO_VERSION_ID_LEN;
575 protocols[1].data = ALPN_HTTP_1_1;
576 protocols[1].size = ALPN_HTTP_1_1_LENGTH;
577 gnutls_alpn_set_protocols(session, protocols, protocols_size, 0);
578 infof(data, "ALPN, offering %s, %s\n", NGHTTP2_PROTO_VERSION_ID,
582 infof(data, "SSL, can't negotiate HTTP/2.0 without ALPN\n");
587 if(rc != GNUTLS_E_SUCCESS) {
588 failf(data, "Did you pass a valid GnuTLS cipher list?");
589 return CURLE_SSL_CONNECT_ERROR;
593 if(data->set.str[STRING_CERT]) {
594 if(gnutls_certificate_set_x509_key_file(
595 conn->ssl[sockindex].cred,
596 data->set.str[STRING_CERT],
597 data->set.str[STRING_KEY] ?
598 data->set.str[STRING_KEY] : data->set.str[STRING_CERT],
599 do_file_type(data->set.str[STRING_CERT_TYPE]) ) !=
601 failf(data, "error reading X.509 key or certificate file");
602 return CURLE_SSL_CONNECT_ERROR;
607 /* put the credentials to the current session */
608 if(data->set.ssl.authtype == CURL_TLSAUTH_SRP) {
609 rc = gnutls_credentials_set(session, GNUTLS_CRD_SRP,
610 conn->ssl[sockindex].srp_client_cred);
611 if(rc != GNUTLS_E_SUCCESS)
612 failf(data, "gnutls_credentials_set() failed: %s", gnutls_strerror(rc));
616 rc = gnutls_credentials_set(session, GNUTLS_CRD_CERTIFICATE,
617 conn->ssl[sockindex].cred);
619 /* set the connection handle (file descriptor for the socket) */
620 gnutls_transport_set_ptr(session,
621 GNUTLS_INT_TO_POINTER_CAST(conn->sock[sockindex]));
623 /* register callback functions to send and receive data. */
624 gnutls_transport_set_push_function(session, Curl_gtls_push);
625 gnutls_transport_set_pull_function(session, Curl_gtls_pull);
627 /* lowat must be set to zero when using custom push and pull functions. */
628 gnutls_transport_set_lowat(session, 0);
630 /* This might be a reconnect, so we check for a session ID in the cache
631 to speed up things */
633 if(!Curl_ssl_getsessionid(conn, &ssl_sessionid, &ssl_idsize)) {
634 /* we got a session id, use it! */
635 gnutls_session_set_data(session, ssl_sessionid, ssl_idsize);
637 /* Informational message */
638 infof (data, "SSL re-using session ID\n");
644 static Curl_recv gtls_recv;
645 static Curl_send gtls_send;
648 gtls_connect_step3(struct connectdata *conn,
651 unsigned int cert_list_size;
652 const gnutls_datum_t *chainp;
653 unsigned int verify_status;
654 gnutls_x509_crt_t x509_cert,x509_issuer;
655 gnutls_datum_t issuerp;
656 char certbuf[256]; /* big enough? */
662 struct SessionHandle *data = conn->data;
663 gnutls_session_t session = conn->ssl[sockindex].session;
668 gnutls_datum_t proto;
670 CURLcode result = CURLE_OK;
672 /* This function will return the peer's raw certificate (chain) as sent by
673 the peer. These certificates are in raw format (DER encoded for
674 X.509). In case of a X.509 then a certificate list may be present. The
675 first certificate in the list is the peer's certificate, following the
676 issuer's certificate, then the issuer's issuer etc. */
678 chainp = gnutls_certificate_get_peers(session, &cert_list_size);
680 if(data->set.ssl.verifypeer ||
681 data->set.ssl.verifyhost ||
682 data->set.ssl.issuercert) {
684 if(data->set.ssl.authtype == CURL_TLSAUTH_SRP
685 && data->set.ssl.username != NULL
686 && !data->set.ssl.verifypeer
687 && gnutls_cipher_get(session)) {
688 /* no peer cert, but auth is ok if we have SRP user and cipher and no
693 failf(data, "failed to get server cert");
694 return CURLE_PEER_FAILED_VERIFICATION;
699 infof(data, "\t common name: WARNING couldn't obtain\n");
702 if(data->set.ssl.verifypeer) {
703 /* This function will try to verify the peer's certificate and return its
704 status (trusted, invalid etc.). The value of status should be one or
705 more of the gnutls_certificate_status_t enumerated elements bitwise
706 or'd. To avoid denial of service attacks some default upper limits
707 regarding the certificate key size and chain size are set. To override
708 them use gnutls_certificate_set_verify_limits(). */
710 rc = gnutls_certificate_verify_peers2(session, &verify_status);
712 failf(data, "server cert verify failed: %d", rc);
713 return CURLE_SSL_CONNECT_ERROR;
716 /* verify_status is a bitmask of gnutls_certificate_status bits */
717 if(verify_status & GNUTLS_CERT_INVALID) {
718 if(data->set.ssl.verifypeer) {
719 failf(data, "server certificate verification failed. CAfile: %s "
720 "CRLfile: %s", data->set.ssl.CAfile?data->set.ssl.CAfile:"none",
721 data->set.ssl.CRLfile?data->set.ssl.CRLfile:"none");
722 return CURLE_SSL_CACERT;
725 infof(data, "\t server certificate verification FAILED\n");
728 infof(data, "\t server certificate verification OK\n");
731 infof(data, "\t server certificate verification SKIPPED\n");
733 /* initialize an X.509 certificate structure. */
734 gnutls_x509_crt_init(&x509_cert);
737 /* convert the given DER or PEM encoded Certificate to the native
738 gnutls_x509_crt_t format */
739 gnutls_x509_crt_import(x509_cert, chainp, GNUTLS_X509_FMT_DER);
741 if(data->set.ssl.issuercert) {
742 gnutls_x509_crt_init(&x509_issuer);
743 issuerp = load_file(data->set.ssl.issuercert);
744 gnutls_x509_crt_import(x509_issuer, &issuerp, GNUTLS_X509_FMT_PEM);
745 rc = gnutls_x509_crt_check_issuer(x509_cert,x509_issuer);
746 unload_file(issuerp);
748 failf(data, "server certificate issuer check failed (IssuerCert: %s)",
749 data->set.ssl.issuercert?data->set.ssl.issuercert:"none");
750 return CURLE_SSL_ISSUER_ERROR;
752 infof(data,"\t server certificate issuer check OK (Issuer Cert: %s)\n",
753 data->set.ssl.issuercert?data->set.ssl.issuercert:"none");
756 size=sizeof(certbuf);
757 rc = gnutls_x509_crt_get_dn_by_oid(x509_cert, GNUTLS_OID_X520_COMMON_NAME,
758 0, /* the first and only one */
763 infof(data, "error fetching CN from cert:%s\n",
764 gnutls_strerror(rc));
767 /* This function will check if the given certificate's subject matches the
768 given hostname. This is a basic implementation of the matching described
769 in RFC2818 (HTTPS), which takes into account wildcards, and the subject
770 alternative name PKIX extension. Returns non zero on success, and zero on
772 rc = gnutls_x509_crt_check_hostname(x509_cert, conn->host.name);
775 if(data->set.ssl.verifyhost) {
776 failf(data, "SSL: certificate subject name (%s) does not match "
777 "target host name '%s'", certbuf, conn->host.dispname);
778 gnutls_x509_crt_deinit(x509_cert);
779 return CURLE_PEER_FAILED_VERIFICATION;
782 infof(data, "\t common name: %s (does not match '%s')\n",
783 certbuf, conn->host.dispname);
786 infof(data, "\t common name: %s (matched)\n", certbuf);
788 /* Check for time-based validity */
789 certclock = gnutls_x509_crt_get_expiration_time(x509_cert);
791 if(certclock == (time_t)-1) {
792 if(data->set.ssl.verifypeer) {
793 failf(data, "server cert expiration date verify failed");
794 return CURLE_SSL_CONNECT_ERROR;
797 infof(data, "\t server certificate expiration date verify FAILED\n");
800 if(certclock < time(NULL)) {
801 if(data->set.ssl.verifypeer) {
802 failf(data, "server certificate expiration date has passed.");
803 return CURLE_PEER_FAILED_VERIFICATION;
806 infof(data, "\t server certificate expiration date FAILED\n");
809 infof(data, "\t server certificate expiration date OK\n");
812 certclock = gnutls_x509_crt_get_activation_time(x509_cert);
814 if(certclock == (time_t)-1) {
815 if(data->set.ssl.verifypeer) {
816 failf(data, "server cert activation date verify failed");
817 return CURLE_SSL_CONNECT_ERROR;
820 infof(data, "\t server certificate activation date verify FAILED\n");
823 if(certclock > time(NULL)) {
824 if(data->set.ssl.verifypeer) {
825 failf(data, "server certificate not activated yet.");
826 return CURLE_PEER_FAILED_VERIFICATION;
829 infof(data, "\t server certificate activation date FAILED\n");
832 infof(data, "\t server certificate activation date OK\n");
846 /* public key algorithm's parameters */
847 algo = gnutls_x509_crt_get_pk_algorithm(x509_cert, &bits);
848 infof(data, "\t certificate public key: %s\n",
849 gnutls_pk_algorithm_get_name(algo));
851 /* version of the X.509 certificate. */
852 infof(data, "\t certificate version: #%d\n",
853 gnutls_x509_crt_get_version(x509_cert));
856 size = sizeof(certbuf);
857 gnutls_x509_crt_get_dn(x509_cert, certbuf, &size);
858 infof(data, "\t subject: %s\n", certbuf);
860 certclock = gnutls_x509_crt_get_activation_time(x509_cert);
861 showtime(data, "start date", certclock);
863 certclock = gnutls_x509_crt_get_expiration_time(x509_cert);
864 showtime(data, "expire date", certclock);
866 size = sizeof(certbuf);
867 gnutls_x509_crt_get_issuer_dn(x509_cert, certbuf, &size);
868 infof(data, "\t issuer: %s\n", certbuf);
870 gnutls_x509_crt_deinit(x509_cert);
872 /* compression algorithm (if any) */
873 ptr = gnutls_compression_get_name(gnutls_compression_get(session));
874 /* the *_get_name() says "NULL" if GNUTLS_COMP_NULL is returned */
875 infof(data, "\t compression: %s\n", ptr);
877 /* the name of the cipher used. ie 3DES. */
878 ptr = gnutls_cipher_get_name(gnutls_cipher_get(session));
879 infof(data, "\t cipher: %s\n", ptr);
881 /* the MAC algorithms name. ie SHA1 */
882 ptr = gnutls_mac_get_name(gnutls_mac_get(session));
883 infof(data, "\t MAC: %s\n", ptr);
886 if(data->set.ssl_enable_alpn) {
887 rc = gnutls_alpn_get_selected_protocol(session, &proto);
889 infof(data, "ALPN, server accepted to use %.*s\n", proto.size,
892 if(proto.size == NGHTTP2_PROTO_VERSION_ID_LEN &&
893 memcmp(NGHTTP2_PROTO_VERSION_ID, proto.data,
894 NGHTTP2_PROTO_VERSION_ID_LEN) == 0) {
895 conn->negnpn = NPN_HTTP2;
897 else if(proto.size == ALPN_HTTP_1_1_LENGTH && memcmp(ALPN_HTTP_1_1,
898 proto.data, ALPN_HTTP_1_1_LENGTH) == 0) {
899 conn->negnpn = NPN_HTTP1_1;
903 infof(data, "ALPN, server did not agree to a protocol\n");
908 conn->ssl[sockindex].state = ssl_connection_complete;
909 conn->recv[sockindex] = gtls_recv;
910 conn->send[sockindex] = gtls_send;
913 /* we always unconditionally get the session id here, as even if we
914 already got it from the cache and asked to use it in the connection, it
915 might've been rejected and then a new one is in use now and we need to
917 void *connect_sessionid;
918 size_t connect_idsize;
920 /* get the session ID data size */
921 gnutls_session_get_data(session, NULL, &connect_idsize);
922 connect_sessionid = malloc(connect_idsize); /* get a buffer for it */
924 if(connect_sessionid) {
925 /* extract session ID to the allocated buffer */
926 gnutls_session_get_data(session, connect_sessionid, &connect_idsize);
928 incache = !(Curl_ssl_getsessionid(conn, &ssl_sessionid, NULL));
930 /* there was one before in the cache, so instead of risking that the
931 previous one was rejected, we just kill that and store the new */
932 Curl_ssl_delsessionid(conn, ssl_sessionid);
935 /* store this session id */
936 result = Curl_ssl_addsessionid(conn, connect_sessionid, connect_idsize);
938 free(connect_sessionid);
939 result = CURLE_OUT_OF_MEMORY;
943 result = CURLE_OUT_OF_MEMORY;
951 * This function is called after the TCP connect has completed. Setup the TLS
952 * layer and do all necessary magic.
954 /* We use connssl->connecting_state to keep track of the connection status;
955 there are three states: 'ssl_connect_1' (not started yet or complete),
956 'ssl_connect_2_reading' (waiting for data from server), and
957 'ssl_connect_2_writing' (waiting to be able to write).
960 gtls_connect_common(struct connectdata *conn,
966 struct ssl_connect_data *connssl = &conn->ssl[sockindex];
968 /* Initiate the connection, if not already done */
969 if(ssl_connect_1==connssl->connecting_state) {
970 rc = gtls_connect_step1 (conn, sockindex);
975 rc = handshake(conn, sockindex, TRUE, nonblocking);
977 /* handshake() sets its own error message with failf() */
980 /* Finish connecting once the handshake is done */
981 if(ssl_connect_1==connssl->connecting_state) {
982 rc = gtls_connect_step3(conn, sockindex);
987 *done = ssl_connect_1==connssl->connecting_state;
993 Curl_gtls_connect_nonblocking(struct connectdata *conn,
997 return gtls_connect_common(conn, sockindex, TRUE, done);
1001 Curl_gtls_connect(struct connectdata *conn,
1008 retcode = gtls_connect_common(conn, sockindex, FALSE, &done);
1017 static ssize_t gtls_send(struct connectdata *conn,
1023 ssize_t rc = gnutls_record_send(conn->ssl[sockindex].session, mem, len);
1026 *curlcode = (rc == GNUTLS_E_AGAIN)
1036 void Curl_gtls_close_all(struct SessionHandle *data)
1038 /* FIX: make the OpenSSL code more generic and use parts of it here */
1042 static void close_one(struct connectdata *conn,
1045 if(conn->ssl[idx].session) {
1046 gnutls_bye(conn->ssl[idx].session, GNUTLS_SHUT_RDWR);
1047 gnutls_deinit(conn->ssl[idx].session);
1048 conn->ssl[idx].session = NULL;
1050 if(conn->ssl[idx].cred) {
1051 gnutls_certificate_free_credentials(conn->ssl[idx].cred);
1052 conn->ssl[idx].cred = NULL;
1055 if(conn->ssl[idx].srp_client_cred) {
1056 gnutls_srp_free_client_credentials(conn->ssl[idx].srp_client_cred);
1057 conn->ssl[idx].srp_client_cred = NULL;
1062 void Curl_gtls_close(struct connectdata *conn, int sockindex)
1064 close_one(conn, sockindex);
1068 * This function is called to shut down the SSL layer but keep the
1069 * socket open (CCC - Clear Command Channel)
1071 int Curl_gtls_shutdown(struct connectdata *conn, int sockindex)
1075 struct SessionHandle *data = conn->data;
1079 /* This has only been tested on the proftpd server, and the mod_tls code
1080 sends a close notify alert without waiting for a close notify alert in
1081 response. Thus we wait for a close notify alert from the server, but
1082 we do not send one. Let's hope other servers do the same... */
1084 if(data->set.ftp_ccc == CURLFTPSSL_CCC_ACTIVE)
1085 gnutls_bye(conn->ssl[sockindex].session, GNUTLS_SHUT_WR);
1087 if(conn->ssl[sockindex].session) {
1089 int what = Curl_socket_ready(conn->sock[sockindex],
1090 CURL_SOCKET_BAD, SSL_SHUTDOWN_TIMEOUT);
1092 /* Something to read, let's do it and hope that it is the close
1093 notify alert from the server */
1094 result = gnutls_record_recv(conn->ssl[sockindex].session,
1098 /* This is the expected response. There was no data but only
1099 the close notify alert */
1102 case GNUTLS_E_AGAIN:
1103 case GNUTLS_E_INTERRUPTED:
1104 infof(data, "GNUTLS_E_AGAIN || GNUTLS_E_INTERRUPTED\n");
1112 else if(0 == what) {
1114 failf(data, "SSL shutdown timeout");
1119 /* anything that gets here is fatally bad */
1120 failf(data, "select/poll on SSL socket, errno: %d", SOCKERRNO);
1125 gnutls_deinit(conn->ssl[sockindex].session);
1127 gnutls_certificate_free_credentials(conn->ssl[sockindex].cred);
1130 if(data->set.ssl.authtype == CURL_TLSAUTH_SRP
1131 && data->set.ssl.username != NULL)
1132 gnutls_srp_free_client_credentials(conn->ssl[sockindex].srp_client_cred);
1135 conn->ssl[sockindex].cred = NULL;
1136 conn->ssl[sockindex].session = NULL;
1141 static ssize_t gtls_recv(struct connectdata *conn, /* connection data */
1142 int num, /* socketindex */
1143 char *buf, /* store read data here */
1144 size_t buffersize, /* max amount to read */
1149 ret = gnutls_record_recv(conn->ssl[num].session, buf, buffersize);
1150 if((ret == GNUTLS_E_AGAIN) || (ret == GNUTLS_E_INTERRUPTED)) {
1151 *curlcode = CURLE_AGAIN;
1155 if(ret == GNUTLS_E_REHANDSHAKE) {
1156 /* BLOCKING call, this is bad but a work-around for now. Fixing this "the
1157 proper way" takes a whole lot of work. */
1158 CURLcode rc = handshake(conn, num, FALSE, FALSE);
1160 /* handshake() writes error message on its own */
1163 *curlcode = CURLE_AGAIN; /* then return as if this was a wouldblock */
1168 failf(conn->data, "GnuTLS recv error (%d): %s",
1169 (int)ret, gnutls_strerror((int)ret));
1170 *curlcode = CURLE_RECV_ERROR;
1177 void Curl_gtls_session_free(void *ptr)
1182 size_t Curl_gtls_version(char *buffer, size_t size)
1184 return snprintf(buffer, size, "GnuTLS/%s", gnutls_check_version(NULL));
1187 int Curl_gtls_seed(struct SessionHandle *data)
1189 /* we have the "SSL is seeded" boolean static to prevent multiple
1190 time-consuming seedings in vain */
1191 static bool ssl_seeded = FALSE;
1193 /* Quickly add a bit of entropy */
1194 #ifndef USE_GNUTLS_NETTLE
1195 gcry_fast_random_poll();
1198 if(!ssl_seeded || data->set.str[STRING_SSL_RANDOM_FILE] ||
1199 data->set.str[STRING_SSL_EGDSOCKET]) {
1201 /* TODO: to a good job seeding the RNG
1202 This may involve the gcry_control function and these options:
1203 GCRYCTL_SET_RANDOM_SEED_FILE
1204 GCRYCTL_SET_RNDEGD_SOCKET
1211 void Curl_gtls_random(struct SessionHandle *data,
1212 unsigned char *entropy,
1215 #if defined(USE_GNUTLS_NETTLE)
1217 gnutls_rnd(GNUTLS_RND_RANDOM, entropy, length);
1218 #elif defined(USE_GNUTLS)
1219 Curl_gtls_seed(data); /* Initiate the seed if not already done */
1220 gcry_randomize(entropy, length, GCRY_STRONG_RANDOM);
1224 void Curl_gtls_md5sum(unsigned char *tmp, /* input */
1226 unsigned char *md5sum, /* output */
1229 #if defined(USE_GNUTLS_NETTLE)
1230 struct md5_ctx MD5pw;
1232 md5_update(&MD5pw, (unsigned int)tmplen, tmp);
1233 md5_digest(&MD5pw, (unsigned int)md5len, md5sum);
1234 #elif defined(USE_GNUTLS)
1236 gcry_md_open(&MD5pw, GCRY_MD_MD5, 0);
1237 gcry_md_write(MD5pw, tmp, tmplen);
1238 memcpy(md5sum, gcry_md_read (MD5pw, 0), md5len);
1239 gcry_md_close(MD5pw);
1243 #endif /* USE_GNUTLS */