1 /* SSL support via GnuTLS library.
2 Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010, 2011 Free Software
5 This file is part of GNU Wget.
7 GNU Wget is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3 of the License, or
10 (at your option) any later version.
12 GNU Wget is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with Wget. If not, see <http://www.gnu.org/licenses/>.
20 Additional permission under GNU GPL version 3 section 7
22 If you modify this program, or any covered work, by linking or
23 combining it with the OpenSSL project's OpenSSL library (or a
24 modified version of that library), containing parts covered by the
25 terms of the OpenSSL or SSLeay licenses, the Free Software Foundation
26 grants you additional permission to convey the resulting work.
27 Corresponding Source for a non-source form of such a combination
28 shall include the source code for the parts of OpenSSL used as well
29 as that of the covered work. */
41 #include <gnutls/gnutls.h>
42 #include <gnutls/x509.h>
44 #include <sys/ioctl.h>
55 /* Note: some of the functions private to this file have names that
56 begin with "wgnutls_" (e.g. wgnutls_read) so that they wouldn't be
57 confused with actual gnutls functions -- such as the gnutls_read
58 preprocessor macro. */
60 static gnutls_certificate_credentials credentials;
65 const char *ca_directory;
68 gnutls_global_init ();
69 gnutls_certificate_allocate_credentials (&credentials);
71 ca_directory = opt.ca_directory ? opt.ca_directory : "/etc/ssl/certs";
73 dir = opendir (ca_directory);
77 logprintf (LOG_NOTQUIET, _("ERROR: Cannot open directory %s.\n"),
83 while ((dent = readdir (dir)) != NULL)
87 asprintf (&ca_file, "%s/%s", ca_directory, dent->d_name);
91 if (S_ISREG (st.st_mode))
92 gnutls_certificate_set_x509_trust_file (credentials, ca_file,
102 gnutls_certificate_set_x509_trust_file (credentials, opt.ca_cert,
103 GNUTLS_X509_FMT_PEM);
107 struct wgnutls_transport_context
109 gnutls_session session; /* GnuTLS session handle */
110 int last_error; /* last error returned by read/write/... */
112 /* Since GnuTLS doesn't support the equivalent to recv(...,
113 MSG_PEEK) or SSL_peek(), we have to do it ourselves. Peeked data
114 is stored to PEEKBUF, and wgnutls_read checks that buffer before
121 # define MIN(i, j) ((i) <= (j) ? (i) : (j))
125 wgnutls_read (int fd, char *buf, int bufsize, void *arg)
128 struct wgnutls_transport_context *ctx = arg;
132 /* If we have any peek data, simply return that. */
133 int copysize = MIN (bufsize, ctx->peeklen);
134 memcpy (buf, ctx->peekbuf, copysize);
135 ctx->peeklen -= copysize;
136 if (ctx->peeklen != 0)
137 memmove (ctx->peekbuf, ctx->peekbuf + copysize, ctx->peeklen);
143 ret = gnutls_record_recv (ctx->session, buf, bufsize);
144 while (ret == GNUTLS_E_INTERRUPTED);
147 ctx->last_error = ret;
153 wgnutls_write (int fd, char *buf, int bufsize, void *arg)
156 struct wgnutls_transport_context *ctx = arg;
158 ret = gnutls_record_send (ctx->session, buf, bufsize);
159 while (ret == GNUTLS_E_INTERRUPTED);
161 ctx->last_error = ret;
166 wgnutls_poll (int fd, double timeout, int wait_for, void *arg)
168 struct wgnutls_transport_context *ctx = arg;
169 return ctx->peeklen || gnutls_record_check_pending (ctx->session)
170 || select_fd (fd, timeout, wait_for);
174 wgnutls_peek (int fd, char *buf, int bufsize, void *arg)
177 struct wgnutls_transport_context *ctx = arg;
178 int offset = MIN (bufsize, ctx->peeklen);
179 if (bufsize > sizeof ctx->peekbuf)
180 bufsize = sizeof ctx->peekbuf;
183 memcpy (buf, ctx->peekbuf, offset);
185 if (bufsize > offset)
189 flags = fcntl (fd, F_GETFL, 0);
193 ret = fcntl (fd, F_SETFL, flags | O_NONBLOCK);
197 /* XXX: Assume it was blocking before. */
199 ret = ioctl (fd, FIONBIO, &zero);
205 ret = gnutls_record_recv (ctx->session, buf + offset,
208 while (ret == GNUTLS_E_INTERRUPTED);
220 memcpy (ctx->peekbuf + offset, buf + offset,
226 fcntl (fd, F_SETFL, flags);
231 ret = ioctl (fd, FIONBIO, &one);
241 wgnutls_errstr (int fd, void *arg)
243 struct wgnutls_transport_context *ctx = arg;
244 return gnutls_strerror (ctx->last_error);
248 wgnutls_close (int fd, void *arg)
250 struct wgnutls_transport_context *ctx = arg;
251 /*gnutls_bye (ctx->session, GNUTLS_SHUT_RDWR);*/
252 gnutls_deinit (ctx->session);
257 /* gnutls_transport is the singleton that describes the SSL transport
258 methods provided by this file. */
260 static struct transport_implementation wgnutls_transport =
262 wgnutls_read, wgnutls_write, wgnutls_poll,
263 wgnutls_peek, wgnutls_errstr, wgnutls_close
267 ssl_connect_wget (int fd)
269 static const int cert_type_priority[] = {
270 GNUTLS_CRT_X509, GNUTLS_CRT_OPENPGP, 0
272 struct wgnutls_transport_context *ctx;
273 gnutls_session session;
275 int allowed_protocols[4] = {0, 0, 0, 0};
276 gnutls_init (&session, GNUTLS_CLIENT);
277 gnutls_set_default_priority (session);
278 gnutls_certificate_type_set_priority (session, cert_type_priority);
279 gnutls_credentials_set (session, GNUTLS_CRD_CERTIFICATE, credentials);
281 # define FD_TO_SOCKET(X) (X)
283 gnutls_transport_set_ptr (session, (gnutls_transport_ptr) FD_TO_SOCKET (fd));
286 switch (opt.secure_protocol)
288 case secure_protocol_auto:
290 case secure_protocol_sslv2:
291 case secure_protocol_sslv3:
292 allowed_protocols[0] = GNUTLS_SSL3;
293 err = gnutls_protocol_set_priority (session, allowed_protocols);
295 case secure_protocol_tlsv1:
296 allowed_protocols[0] = GNUTLS_TLS1_0;
297 allowed_protocols[1] = GNUTLS_TLS1_1;
298 allowed_protocols[2] = GNUTLS_TLS1_2;
299 err = gnutls_protocol_set_priority (session, allowed_protocols);
306 logprintf (LOG_NOTQUIET, "GnuTLS: %s\n", gnutls_strerror (err));
307 gnutls_deinit (session);
311 err = gnutls_handshake (session);
314 logprintf (LOG_NOTQUIET, "GnuTLS: %s\n", gnutls_strerror (err));
315 gnutls_deinit (session);
319 ctx = xnew0 (struct wgnutls_transport_context);
320 ctx->session = session;
321 fd_register_transport (fd, &wgnutls_transport, ctx);
326 ssl_check_certificate (int fd, const char *host)
328 struct wgnutls_transport_context *ctx = fd_transport_context (fd);
333 /* If the user has specified --no-check-cert, we still want to warn
334 him about problems with the server's certificate. */
335 const char *severity = opt.check_cert ? _("ERROR") : _("WARNING");
338 err = gnutls_certificate_verify_peers2 (ctx->session, &status);
341 logprintf (LOG_NOTQUIET, _("%s: No certificate presented by %s.\n"),
342 severity, quotearg_style (escape_quoting_style, host));
347 if (status & GNUTLS_CERT_INVALID)
349 logprintf (LOG_NOTQUIET, _("%s: The certificate of %s is not trusted.\n"),
350 severity, quote (host));
353 if (status & GNUTLS_CERT_SIGNER_NOT_FOUND)
355 logprintf (LOG_NOTQUIET, _("%s: The certificate of %s hasn't got a known issuer.\n"),
356 severity, quote (host));
359 if (status & GNUTLS_CERT_REVOKED)
361 logprintf (LOG_NOTQUIET, _("%s: The certificate of %s has been revoked.\n"),
362 severity, quote (host));
366 if (gnutls_certificate_type_get (ctx->session) == GNUTLS_CRT_X509)
368 time_t now = time (NULL);
369 gnutls_x509_crt cert;
370 const gnutls_datum *cert_list;
371 unsigned int cert_list_size;
373 if ((err = gnutls_x509_crt_init (&cert)) < 0)
375 logprintf (LOG_NOTQUIET, _("Error initializing X509 certificate: %s\n"),
376 gnutls_strerror (err));
381 cert_list = gnutls_certificate_get_peers (ctx->session, &cert_list_size);
384 logprintf (LOG_NOTQUIET, _("No certificate found\n"));
388 err = gnutls_x509_crt_import (cert, cert_list, GNUTLS_X509_FMT_DER);
391 logprintf (LOG_NOTQUIET, _("Error parsing certificate: %s\n"),
392 gnutls_strerror (err));
396 if (now < gnutls_x509_crt_get_activation_time (cert))
398 logprintf (LOG_NOTQUIET, _("The certificate has not yet been activated\n"));
401 if (now >= gnutls_x509_crt_get_expiration_time (cert))
403 logprintf (LOG_NOTQUIET, _("The certificate has expired\n"));
406 if (!gnutls_x509_crt_check_hostname (cert, host))
408 logprintf (LOG_NOTQUIET,
409 _("The certificate's owner does not match hostname %s\n"),
413 gnutls_x509_crt_deinit (cert);
417 return opt.check_cert ? success : true;