55700cb01f
such as the CURLOPT_SSL_CTX_FUNCTION one treat that as if it was a Location: following. The patch that introduced this feature was done for 7.11.0, but this code and functionality has been broken since about 7.15.4 (March 2006) with the introduction of non-blocking OpenSSL "connects". It was a hack to begin with and since it doesn't work and hasn't worked correctly for a long time and nobody has even noticed, I consider it a very suitable subject for plain removal. And so it was done.
690 lines
21 KiB
C
690 lines
21 KiB
C
/***************************************************************************
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* _ _ ____ _
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* Project ___| | | | _ \| |
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* / __| | | | |_) | |
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* | (__| |_| | _ <| |___
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* \___|\___/|_| \_\_____|
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*
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* Copyright (C) 1998 - 2008, Daniel Stenberg, <daniel@haxx.se>, et al.
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*
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* This software is licensed as described in the file COPYING, which
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* you should have received as part of this distribution. The terms
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* are also available at http://curl.haxx.se/docs/copyright.html.
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*
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* You may opt to use, copy, modify, merge, publish, distribute and/or sell
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* copies of the Software, and permit persons to whom the Software is
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* furnished to do so, under the terms of the COPYING file.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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* $Id$
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***************************************************************************/
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/*
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* Source file for all GnuTLS-specific code for the TLS/SSL layer. No code
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* but sslgen.c should ever call or use these functions.
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*
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* Note: don't use the GnuTLS' *_t variable type names in this source code,
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* since they were not present in 1.0.X.
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*/
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#include "setup.h"
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#ifdef USE_GNUTLS
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#include <gnutls/gnutls.h>
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#include <gnutls/x509.h>
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#include <string.h>
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#include <stdlib.h>
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#include <ctype.h>
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#ifdef HAVE_SYS_SOCKET_H
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#include <sys/socket.h>
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#endif
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#include "urldata.h"
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#include "sendf.h"
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#include "gtls.h"
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#include "sslgen.h"
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#include "parsedate.h"
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#include "connect.h" /* for the connect timeout */
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#include "select.h"
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#define _MPRINTF_REPLACE /* use our functions only */
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#include <curl/mprintf.h>
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#include "memory.h"
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/* The last #include file should be: */
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#include "memdebug.h"
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/* Enable GnuTLS debugging by defining GTLSDEBUG */
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/*#define GTLSDEBUG */
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#ifdef GTLSDEBUG
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static void tls_log_func(int level, const char *str)
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{
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fprintf(stderr, "|<%d>| %s", level, str);
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}
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#endif
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static bool gtls_inited = FALSE;
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/*
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* Custom push and pull callback functions used by GNU TLS to read and write
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* to the socket. These functions are simple wrappers to send() and recv()
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* (although here using the sread/swrite macros as defined by setup_once.h).
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* We use custom functions rather than the GNU TLS defaults because it allows
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* us to get specific about the fourth "flags" argument, and to use arbitrary
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* private data with gnutls_transport_set_ptr if we wish.
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*/
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static ssize_t Curl_gtls_push(void *s, const void *buf, size_t len)
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{
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return swrite(s, buf, len);
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}
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static ssize_t Curl_gtls_pull(void *s, void *buf, size_t len)
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{
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return sread(s, buf, len);
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}
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/* Global GnuTLS init, called from Curl_ssl_init() */
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int Curl_gtls_init(void)
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{
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/* Unfortunately we can not init here, things like curl --version will
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* fail to work if there is no egd socket available because libgcrypt
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* will EXIT the application!!
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* By doing the actual init later (before actually trying to use GnuTLS),
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* we can at least provide basic info etc.
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*/
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return 1;
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}
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static int _Curl_gtls_init(void)
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{
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int ret = 1;
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if(!gtls_inited) {
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ret = gnutls_global_init()?0:1;
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#ifdef GTLSDEBUG
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gnutls_global_set_log_function(tls_log_func);
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gnutls_global_set_log_level(2);
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#endif
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gtls_inited = TRUE;
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}
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return ret;
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}
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int Curl_gtls_cleanup(void)
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{
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if(gtls_inited) {
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gnutls_global_deinit();
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gtls_inited = FALSE;
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}
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return 1;
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}
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static void showtime(struct SessionHandle *data,
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const char *text,
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time_t stamp)
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{
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struct tm *tm;
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#ifdef HAVE_GMTIME_R
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struct tm buffer;
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tm = (struct tm *)gmtime_r(&stamp, &buffer);
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#else
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tm = gmtime(&stamp);
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#endif
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snprintf(data->state.buffer,
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BUFSIZE,
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"\t %s: %s, %02d %s %4d %02d:%02d:%02d GMT\n",
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text,
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Curl_wkday[tm->tm_wday?tm->tm_wday-1:6],
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tm->tm_mday,
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Curl_month[tm->tm_mon],
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tm->tm_year + 1900,
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tm->tm_hour,
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tm->tm_min,
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tm->tm_sec);
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infof(data, "%s", data->state.buffer);
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}
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/* this function does a BLOCKING SSL/TLS (re-)handshake */
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static CURLcode handshake(struct connectdata *conn,
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gnutls_session session,
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int sockindex,
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bool duringconnect)
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{
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struct SessionHandle *data = conn->data;
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int rc;
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if(!gtls_inited)
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_Curl_gtls_init();
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do {
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rc = gnutls_handshake(session);
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if((rc == GNUTLS_E_AGAIN) || (rc == GNUTLS_E_INTERRUPTED)) {
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long timeout_ms = Curl_timeleft(conn, NULL, duringconnect);
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if(timeout_ms < 0) {
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/* a precaution, no need to continue if time already is up */
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failf(data, "SSL connection timeout");
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return CURLE_OPERATION_TIMEDOUT;
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}
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rc = Curl_socket_ready(conn->sock[sockindex],
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conn->sock[sockindex], (int)timeout_ms);
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if(rc > 0)
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/* reabable or writable, go loop*/
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continue;
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else if(0 == rc) {
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/* timeout */
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failf(data, "SSL connection timeout");
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return CURLE_OPERATION_TIMEDOUT;
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}
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else {
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/* anything that gets here is fatally bad */
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failf(data, "select/poll on SSL socket, errno: %d", SOCKERRNO);
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return CURLE_SSL_CONNECT_ERROR;
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}
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}
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else
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break;
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} while(1);
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if(rc < 0) {
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failf(data, "gnutls_handshake() failed: %s", gnutls_strerror(rc));
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return CURLE_SSL_CONNECT_ERROR;
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}
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return CURLE_OK;
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}
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static gnutls_x509_crt_fmt do_file_type(const char *type)
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{
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if(!type || !type[0])
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return GNUTLS_X509_FMT_PEM;
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if(curl_strequal(type, "PEM"))
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return GNUTLS_X509_FMT_PEM;
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if(curl_strequal(type, "DER"))
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return GNUTLS_X509_FMT_DER;
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return -1;
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}
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/*
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* This function is called after the TCP connect has completed. Setup the TLS
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* layer and do all necessary magic.
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*/
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CURLcode
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Curl_gtls_connect(struct connectdata *conn,
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int sockindex)
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{
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static const int cert_type_priority[] = { GNUTLS_CRT_X509, 0 };
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struct SessionHandle *data = conn->data;
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gnutls_session session;
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int rc;
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unsigned int cert_list_size;
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const gnutls_datum *chainp;
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unsigned int verify_status;
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gnutls_x509_crt x509_cert;
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char certbuf[256]; /* big enough? */
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size_t size;
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unsigned int algo;
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unsigned int bits;
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time_t certclock;
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const char *ptr;
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void *ssl_sessionid;
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size_t ssl_idsize;
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if(!gtls_inited)
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_Curl_gtls_init();
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/* GnuTLS only supports TLSv1 (and SSLv3?) */
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if(data->set.ssl.version == CURL_SSLVERSION_SSLv2) {
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failf(data, "GnuTLS does not support SSLv2");
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return CURLE_SSL_CONNECT_ERROR;
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}
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/* allocate a cred struct */
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rc = gnutls_certificate_allocate_credentials(&conn->ssl[sockindex].cred);
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if(rc < 0) {
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failf(data, "gnutls_cert_all_cred() failed: %s", gnutls_strerror(rc));
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return CURLE_SSL_CONNECT_ERROR;
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}
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if(data->set.ssl.CAfile) {
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/* set the trusted CA cert bundle file */
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gnutls_certificate_set_verify_flags(conn->ssl[sockindex].cred,
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GNUTLS_VERIFY_ALLOW_X509_V1_CA_CRT);
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rc = gnutls_certificate_set_x509_trust_file(conn->ssl[sockindex].cred,
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data->set.ssl.CAfile,
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GNUTLS_X509_FMT_PEM);
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if(rc < 0) {
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infof(data, "error reading ca cert file %s (%s)\n",
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data->set.ssl.CAfile, gnutls_strerror(rc));
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if(data->set.ssl.verifypeer)
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return CURLE_SSL_CACERT_BADFILE;
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}
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else
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infof(data, "found %d certificates in %s\n",
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rc, data->set.ssl.CAfile);
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}
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/* Initialize TLS session as a client */
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rc = gnutls_init(&conn->ssl[sockindex].session, GNUTLS_CLIENT);
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if(rc) {
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failf(data, "gnutls_init() failed: %d", rc);
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return CURLE_SSL_CONNECT_ERROR;
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}
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/* convenient assign */
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session = conn->ssl[sockindex].session;
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/* Use default priorities */
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rc = gnutls_set_default_priority(session);
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if(rc < 0)
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return CURLE_SSL_CONNECT_ERROR;
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/* Sets the priority on the certificate types supported by gnutls. Priority
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is higher for types specified before others. After specifying the types
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you want, you must append a 0. */
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rc = gnutls_certificate_type_set_priority(session, cert_type_priority);
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if(rc < 0)
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return CURLE_SSL_CONNECT_ERROR;
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if(data->set.str[STRING_CERT]) {
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if( gnutls_certificate_set_x509_key_file(
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conn->ssl[sockindex].cred,
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data->set.str[STRING_CERT],
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data->set.str[STRING_KEY] ?
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data->set.str[STRING_KEY] : data->set.str[STRING_CERT],
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do_file_type(data->set.str[STRING_CERT_TYPE]) ) ) {
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failf(data, "error reading X.509 key or certificate file");
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return CURLE_SSL_CONNECT_ERROR;
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}
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}
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/* put the credentials to the current session */
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rc = gnutls_credentials_set(session, GNUTLS_CRD_CERTIFICATE,
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conn->ssl[sockindex].cred);
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/* set the connection handle (file descriptor for the socket) */
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gnutls_transport_set_ptr(session,
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(gnutls_transport_ptr)conn->sock[sockindex]);
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/* register callback functions to send and receive data. */
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gnutls_transport_set_push_function(session, Curl_gtls_push);
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gnutls_transport_set_pull_function(session, Curl_gtls_pull);
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/* lowat must be set to zero when using custom push and pull functions. */
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gnutls_transport_set_lowat(session, 0);
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/* This might be a reconnect, so we check for a session ID in the cache
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to speed up things */
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if(!Curl_ssl_getsessionid(conn, &ssl_sessionid, &ssl_idsize)) {
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/* we got a session id, use it! */
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gnutls_session_set_data(session, ssl_sessionid, ssl_idsize);
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/* Informational message */
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infof (data, "SSL re-using session ID\n");
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}
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rc = handshake(conn, session, sockindex, TRUE);
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if(rc)
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/* handshake() sets its own error message with failf() */
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return rc;
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/* This function will return the peer's raw certificate (chain) as sent by
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the peer. These certificates are in raw format (DER encoded for
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X.509). In case of a X.509 then a certificate list may be present. The
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first certificate in the list is the peer's certificate, following the
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issuer's certificate, then the issuer's issuer etc. */
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chainp = gnutls_certificate_get_peers(session, &cert_list_size);
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if(!chainp) {
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if(data->set.ssl.verifypeer) {
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failf(data, "failed to get server cert");
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return CURLE_PEER_FAILED_VERIFICATION;
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}
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infof(data, "\t common name: WARNING couldn't obtain\n");
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}
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if(data->set.ssl.verifypeer) {
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/* This function will try to verify the peer's certificate and return its
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status (trusted, invalid etc.). The value of status should be one or
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more of the gnutls_certificate_status_t enumerated elements bitwise
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or'd. To avoid denial of service attacks some default upper limits
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regarding the certificate key size and chain size are set. To override
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them use gnutls_certificate_set_verify_limits(). */
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rc = gnutls_certificate_verify_peers2(session, &verify_status);
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if(rc < 0) {
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failf(data, "server cert verify failed: %d", rc);
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return CURLE_SSL_CONNECT_ERROR;
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}
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/* verify_status is a bitmask of gnutls_certificate_status bits */
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if(verify_status & GNUTLS_CERT_INVALID) {
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if(data->set.ssl.verifypeer) {
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failf(data, "server certificate verification failed. CAfile: %s",
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data->set.ssl.CAfile?data->set.ssl.CAfile:"none");
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return CURLE_SSL_CACERT;
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}
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else
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infof(data, "\t server certificate verification FAILED\n");
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}
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else
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infof(data, "\t server certificate verification OK\n");
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}
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else
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infof(data, "\t server certificate verification SKIPPED\n");
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/* initialize an X.509 certificate structure. */
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gnutls_x509_crt_init(&x509_cert);
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|
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/* convert the given DER or PEM encoded Certificate to the native
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gnutls_x509_crt_t format */
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gnutls_x509_crt_import(x509_cert, chainp, GNUTLS_X509_FMT_DER);
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size=sizeof(certbuf);
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rc = gnutls_x509_crt_get_dn_by_oid(x509_cert, GNUTLS_OID_X520_COMMON_NAME,
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0, /* the first and only one */
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FALSE,
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certbuf,
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&size);
|
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if(rc) {
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infof(data, "error fetching CN from cert:%s\n",
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gnutls_strerror(rc));
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}
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|
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/* This function will check if the given certificate's subject matches the
|
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given hostname. This is a basic implementation of the matching described
|
|
in RFC2818 (HTTPS), which takes into account wildcards, and the subject
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alternative name PKIX extension. Returns non zero on success, and zero on
|
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failure. */
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rc = gnutls_x509_crt_check_hostname(x509_cert, conn->host.name);
|
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|
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if(!rc) {
|
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if(data->set.ssl.verifyhost > 1) {
|
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failf(data, "SSL: certificate subject name (%s) does not match "
|
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"target host name '%s'", certbuf, conn->host.dispname);
|
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gnutls_x509_crt_deinit(x509_cert);
|
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return CURLE_PEER_FAILED_VERIFICATION;
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}
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else
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infof(data, "\t common name: %s (does not match '%s')\n",
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certbuf, conn->host.dispname);
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}
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else
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infof(data, "\t common name: %s (matched)\n", certbuf);
|
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|
|
/* Check for time-based validity */
|
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certclock = gnutls_x509_crt_get_expiration_time(x509_cert);
|
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|
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if(certclock == (time_t)-1) {
|
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failf(data, "server cert expiration date verify failed");
|
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return CURLE_SSL_CONNECT_ERROR;
|
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}
|
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|
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if(certclock < time(NULL)) {
|
|
if(data->set.ssl.verifypeer) {
|
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failf(data, "server certificate expiration date has passed.");
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return CURLE_PEER_FAILED_VERIFICATION;
|
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}
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else
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infof(data, "\t server certificate expiration date FAILED\n");
|
|
}
|
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else
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infof(data, "\t server certificate expiration date OK\n");
|
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|
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certclock = gnutls_x509_crt_get_activation_time(x509_cert);
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|
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if(certclock == (time_t)-1) {
|
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failf(data, "server cert activation date verify failed");
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return CURLE_SSL_CONNECT_ERROR;
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}
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|
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if(certclock > time(NULL)) {
|
|
if(data->set.ssl.verifypeer) {
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failf(data, "server certificate not activated yet.");
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return CURLE_PEER_FAILED_VERIFICATION;
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}
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else
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infof(data, "\t server certificate activation date FAILED\n");
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|
}
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else
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|
infof(data, "\t server certificate activation date OK\n");
|
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|
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/* Show:
|
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- ciphers used
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- subject
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- start date
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- expire date
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- common name
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- issuer
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*/
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|
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/* public key algorithm's parameters */
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algo = gnutls_x509_crt_get_pk_algorithm(x509_cert, &bits);
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infof(data, "\t certificate public key: %s\n",
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gnutls_pk_algorithm_get_name(algo));
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|
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/* version of the X.509 certificate. */
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|
infof(data, "\t certificate version: #%d\n",
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gnutls_x509_crt_get_version(x509_cert));
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|
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|
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size = sizeof(certbuf);
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gnutls_x509_crt_get_dn(x509_cert, certbuf, &size);
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infof(data, "\t subject: %s\n", certbuf);
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certclock = gnutls_x509_crt_get_activation_time(x509_cert);
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showtime(data, "start date", certclock);
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certclock = gnutls_x509_crt_get_expiration_time(x509_cert);
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showtime(data, "expire date", certclock);
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|
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size = sizeof(certbuf);
|
|
gnutls_x509_crt_get_issuer_dn(x509_cert, certbuf, &size);
|
|
infof(data, "\t issuer: %s\n", certbuf);
|
|
|
|
gnutls_x509_crt_deinit(x509_cert);
|
|
|
|
/* compression algorithm (if any) */
|
|
ptr = gnutls_compression_get_name(gnutls_compression_get(session));
|
|
/* the *_get_name() says "NULL" if GNUTLS_COMP_NULL is returned */
|
|
infof(data, "\t compression: %s\n", ptr);
|
|
|
|
/* the name of the cipher used. ie 3DES. */
|
|
ptr = gnutls_cipher_get_name(gnutls_cipher_get(session));
|
|
infof(data, "\t cipher: %s\n", ptr);
|
|
|
|
/* the MAC algorithms name. ie SHA1 */
|
|
ptr = gnutls_mac_get_name(gnutls_mac_get(session));
|
|
infof(data, "\t MAC: %s\n", ptr);
|
|
|
|
if(!ssl_sessionid) {
|
|
/* this session was not previously in the cache, add it now */
|
|
|
|
/* get the session ID data size */
|
|
gnutls_session_get_data(session, NULL, &ssl_idsize);
|
|
ssl_sessionid = malloc(ssl_idsize); /* get a buffer for it */
|
|
|
|
if(ssl_sessionid) {
|
|
/* extract session ID to the allocated buffer */
|
|
gnutls_session_get_data(session, ssl_sessionid, &ssl_idsize);
|
|
|
|
/* store this session id */
|
|
return Curl_ssl_addsessionid(conn, ssl_sessionid, ssl_idsize);
|
|
}
|
|
}
|
|
|
|
return CURLE_OK;
|
|
}
|
|
|
|
|
|
/* return number of sent (non-SSL) bytes */
|
|
ssize_t Curl_gtls_send(struct connectdata *conn,
|
|
int sockindex,
|
|
void *mem,
|
|
size_t len)
|
|
{
|
|
ssize_t rc = gnutls_record_send(conn->ssl[sockindex].session, mem, len);
|
|
|
|
if(rc < 0 ) {
|
|
if(rc == GNUTLS_E_AGAIN)
|
|
return 0; /* EWOULDBLOCK equivalent */
|
|
rc = -1; /* generic error code for send failure */
|
|
}
|
|
|
|
return rc;
|
|
}
|
|
|
|
void Curl_gtls_close_all(struct SessionHandle *data)
|
|
{
|
|
/* FIX: make the OpenSSL code more generic and use parts of it here */
|
|
(void)data;
|
|
}
|
|
|
|
static void close_one(struct connectdata *conn,
|
|
int idx)
|
|
{
|
|
if(conn->ssl[idx].session) {
|
|
gnutls_bye(conn->ssl[idx].session, GNUTLS_SHUT_RDWR);
|
|
gnutls_deinit(conn->ssl[idx].session);
|
|
conn->ssl[idx].session = NULL;
|
|
}
|
|
if(conn->ssl[idx].cred) {
|
|
gnutls_certificate_free_credentials(conn->ssl[idx].cred);
|
|
conn->ssl[idx].cred = NULL;
|
|
}
|
|
}
|
|
|
|
void Curl_gtls_close(struct connectdata *conn, int sockindex)
|
|
{
|
|
close_one(conn, sockindex);
|
|
}
|
|
|
|
/*
|
|
* This function is called to shut down the SSL layer but keep the
|
|
* socket open (CCC - Clear Command Channel)
|
|
*/
|
|
int Curl_gtls_shutdown(struct connectdata *conn, int sockindex)
|
|
{
|
|
int result;
|
|
int retval = 0;
|
|
struct SessionHandle *data = conn->data;
|
|
int done = 0;
|
|
char buf[120];
|
|
|
|
/* This has only been tested on the proftpd server, and the mod_tls code
|
|
sends a close notify alert without waiting for a close notify alert in
|
|
response. Thus we wait for a close notify alert from the server, but
|
|
we do not send one. Let's hope other servers do the same... */
|
|
|
|
if(data->set.ftp_ccc == CURLFTPSSL_CCC_ACTIVE)
|
|
gnutls_bye(conn->ssl[sockindex].session, GNUTLS_SHUT_WR);
|
|
|
|
if(conn->ssl[sockindex].session) {
|
|
while(!done) {
|
|
int what = Curl_socket_ready(conn->sock[sockindex],
|
|
CURL_SOCKET_BAD, SSL_SHUTDOWN_TIMEOUT);
|
|
if(what > 0) {
|
|
/* Something to read, let's do it and hope that it is the close
|
|
notify alert from the server */
|
|
result = gnutls_record_recv(conn->ssl[sockindex].session,
|
|
buf, sizeof(buf));
|
|
switch(result) {
|
|
case 0:
|
|
/* This is the expected response. There was no data but only
|
|
the close notify alert */
|
|
done = 1;
|
|
break;
|
|
case GNUTLS_E_AGAIN:
|
|
case GNUTLS_E_INTERRUPTED:
|
|
infof(data, "GNUTLS_E_AGAIN || GNUTLS_E_INTERRUPTED\n");
|
|
break;
|
|
default:
|
|
retval = -1;
|
|
done = 1;
|
|
break;
|
|
}
|
|
}
|
|
else if(0 == what) {
|
|
/* timeout */
|
|
failf(data, "SSL shutdown timeout");
|
|
done = 1;
|
|
break;
|
|
}
|
|
else {
|
|
/* anything that gets here is fatally bad */
|
|
failf(data, "select/poll on SSL socket, errno: %d", SOCKERRNO);
|
|
retval = -1;
|
|
done = 1;
|
|
}
|
|
}
|
|
gnutls_deinit(conn->ssl[sockindex].session);
|
|
}
|
|
gnutls_certificate_free_credentials(conn->ssl[sockindex].cred);
|
|
|
|
conn->ssl[sockindex].cred = NULL;
|
|
conn->ssl[sockindex].session = NULL;
|
|
|
|
return retval;
|
|
}
|
|
|
|
/*
|
|
* If the read would block we return -1 and set 'wouldblock' to TRUE.
|
|
* Otherwise we return the amount of data read. Other errors should return -1
|
|
* and set 'wouldblock' to FALSE.
|
|
*/
|
|
ssize_t Curl_gtls_recv(struct connectdata *conn, /* connection data */
|
|
int num, /* socketindex */
|
|
char *buf, /* store read data here */
|
|
size_t buffersize, /* max amount to read */
|
|
bool *wouldblock)
|
|
{
|
|
ssize_t ret;
|
|
|
|
ret = gnutls_record_recv(conn->ssl[num].session, buf, buffersize);
|
|
if((ret == GNUTLS_E_AGAIN) || (ret == GNUTLS_E_INTERRUPTED)) {
|
|
*wouldblock = TRUE;
|
|
return -1;
|
|
}
|
|
|
|
if(ret == GNUTLS_E_REHANDSHAKE) {
|
|
/* BLOCKING call, this is bad but a work-around for now. Fixing this "the
|
|
proper way" takes a whole lot of work. */
|
|
CURLcode rc = handshake(conn, conn->ssl[num].session, num, FALSE);
|
|
if(rc)
|
|
/* handshake() writes error message on its own */
|
|
return rc;
|
|
*wouldblock = TRUE; /* then return as if this was a wouldblock */
|
|
return -1;
|
|
}
|
|
|
|
*wouldblock = FALSE;
|
|
if(!ret) {
|
|
failf(conn->data, "Peer closed the TLS connection");
|
|
return -1;
|
|
}
|
|
|
|
if(ret < 0) {
|
|
failf(conn->data, "GnuTLS recv error (%d): %s",
|
|
(int)ret, gnutls_strerror(ret));
|
|
return -1;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
void Curl_gtls_session_free(void *ptr)
|
|
{
|
|
free(ptr);
|
|
}
|
|
|
|
size_t Curl_gtls_version(char *buffer, size_t size)
|
|
{
|
|
return snprintf(buffer, size, "GnuTLS/%s", gnutls_check_version(NULL));
|
|
}
|
|
|
|
#endif /* USE_GNUTLS */
|