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);
70 gnutls_certificate_set_verify_flags(credentials,
71 GNUTLS_VERIFY_ALLOW_X509_V1_CA_CRT);
73 ca_directory = opt.ca_directory ? opt.ca_directory : "/etc/ssl/certs";
75 dir = opendir (ca_directory);
79 logprintf (LOG_NOTQUIET, _("ERROR: Cannot open directory %s.\n"),
85 while ((dent = readdir (dir)) != NULL)
89 asprintf (&ca_file, "%s/%s", ca_directory, dent->d_name);
93 if (S_ISREG (st.st_mode))
94 gnutls_certificate_set_x509_trust_file (credentials, ca_file,
104 gnutls_certificate_set_x509_trust_file (credentials, opt.ca_cert,
105 GNUTLS_X509_FMT_PEM);
109 struct wgnutls_transport_context
111 gnutls_session session; /* GnuTLS session handle */
112 int last_error; /* last error returned by read/write/... */
114 /* Since GnuTLS doesn't support the equivalent to recv(...,
115 MSG_PEEK) or SSL_peek(), we have to do it ourselves. Peeked data
116 is stored to PEEKBUF, and wgnutls_read checks that buffer before
123 # define MIN(i, j) ((i) <= (j) ? (i) : (j))
127 wgnutls_read (int fd, char *buf, int bufsize, void *arg)
130 struct wgnutls_transport_context *ctx = arg;
134 /* If we have any peek data, simply return that. */
135 int copysize = MIN (bufsize, ctx->peeklen);
136 memcpy (buf, ctx->peekbuf, copysize);
137 ctx->peeklen -= copysize;
138 if (ctx->peeklen != 0)
139 memmove (ctx->peekbuf, ctx->peekbuf + copysize, ctx->peeklen);
145 ret = gnutls_record_recv (ctx->session, buf, bufsize);
146 while (ret == GNUTLS_E_INTERRUPTED || ret == GNUTLS_E_AGAIN);
149 ctx->last_error = ret;
155 wgnutls_write (int fd, char *buf, int bufsize, void *arg)
158 struct wgnutls_transport_context *ctx = arg;
160 ret = gnutls_record_send (ctx->session, buf, bufsize);
161 while (ret == GNUTLS_E_INTERRUPTED || ret == GNUTLS_E_AGAIN);
163 ctx->last_error = ret;
168 wgnutls_poll (int fd, double timeout, int wait_for, void *arg)
170 struct wgnutls_transport_context *ctx = arg;
171 return ctx->peeklen || gnutls_record_check_pending (ctx->session)
172 || select_fd (fd, timeout, wait_for);
176 wgnutls_peek (int fd, char *buf, int bufsize, void *arg)
178 int ret = 0, read = 0;
179 struct wgnutls_transport_context *ctx = arg;
180 int offset = MIN (bufsize, ctx->peeklen);
181 if (bufsize > sizeof ctx->peekbuf)
182 bufsize = sizeof ctx->peekbuf;
185 memcpy (buf, ctx->peekbuf, offset);
187 if (bufsize > offset)
191 flags = fcntl (fd, F_GETFL, 0);
195 ret = fcntl (fd, F_SETFL, flags | O_NONBLOCK);
199 /* XXX: Assume it was blocking before. */
201 ret = ioctl (fd, FIONBIO, &one);
205 read = gnutls_record_recv (ctx->session, buf + offset,
217 memcpy (ctx->peekbuf + offset, buf + offset,
219 ctx->peeklen += read;
223 ret = fcntl (fd, F_SETFL, flags);
228 ret = ioctl (fd, FIONBIO, &zero);
234 return offset + read;
238 wgnutls_errstr (int fd, void *arg)
240 struct wgnutls_transport_context *ctx = arg;
241 return gnutls_strerror (ctx->last_error);
245 wgnutls_close (int fd, void *arg)
247 struct wgnutls_transport_context *ctx = arg;
248 /*gnutls_bye (ctx->session, GNUTLS_SHUT_RDWR);*/
249 gnutls_deinit (ctx->session);
254 /* gnutls_transport is the singleton that describes the SSL transport
255 methods provided by this file. */
257 static struct transport_implementation wgnutls_transport =
259 wgnutls_read, wgnutls_write, wgnutls_poll,
260 wgnutls_peek, wgnutls_errstr, wgnutls_close
264 ssl_connect_wget (int fd)
266 static const int cert_type_priority[] = {
267 GNUTLS_CRT_X509, GNUTLS_CRT_OPENPGP, 0
269 struct wgnutls_transport_context *ctx;
270 gnutls_session session;
272 int allowed_protocols[4] = {0, 0, 0, 0};
273 gnutls_init (&session, GNUTLS_CLIENT);
274 gnutls_set_default_priority (session);
275 gnutls_certificate_type_set_priority (session, cert_type_priority);
276 gnutls_credentials_set (session, GNUTLS_CRD_CERTIFICATE, credentials);
278 # define FD_TO_SOCKET(X) (X)
280 gnutls_transport_set_ptr (session, (gnutls_transport_ptr) FD_TO_SOCKET (fd));
283 switch (opt.secure_protocol)
285 case secure_protocol_auto:
287 case secure_protocol_sslv2:
288 case secure_protocol_sslv3:
289 allowed_protocols[0] = GNUTLS_SSL3;
290 err = gnutls_protocol_set_priority (session, allowed_protocols);
292 case secure_protocol_tlsv1:
293 allowed_protocols[0] = GNUTLS_TLS1_0;
294 allowed_protocols[1] = GNUTLS_TLS1_1;
295 allowed_protocols[2] = GNUTLS_TLS1_2;
296 err = gnutls_protocol_set_priority (session, allowed_protocols);
303 logprintf (LOG_NOTQUIET, "GnuTLS: %s\n", gnutls_strerror (err));
304 gnutls_deinit (session);
308 err = gnutls_handshake (session);
311 logprintf (LOG_NOTQUIET, "GnuTLS: %s\n", gnutls_strerror (err));
312 gnutls_deinit (session);
316 ctx = xnew0 (struct wgnutls_transport_context);
317 ctx->session = session;
318 fd_register_transport (fd, &wgnutls_transport, ctx);
323 ssl_check_certificate (int fd, const char *host)
325 struct wgnutls_transport_context *ctx = fd_transport_context (fd);
330 /* If the user has specified --no-check-cert, we still want to warn
331 him about problems with the server's certificate. */
332 const char *severity = opt.check_cert ? _("ERROR") : _("WARNING");
335 err = gnutls_certificate_verify_peers2 (ctx->session, &status);
338 logprintf (LOG_NOTQUIET, _("%s: No certificate presented by %s.\n"),
339 severity, quotearg_style (escape_quoting_style, host));
344 if (status & GNUTLS_CERT_INVALID)
346 logprintf (LOG_NOTQUIET, _("%s: The certificate of %s is not trusted.\n"),
347 severity, quote (host));
350 if (status & GNUTLS_CERT_SIGNER_NOT_FOUND)
352 logprintf (LOG_NOTQUIET, _("%s: The certificate of %s hasn't got a known issuer.\n"),
353 severity, quote (host));
356 if (status & GNUTLS_CERT_REVOKED)
358 logprintf (LOG_NOTQUIET, _("%s: The certificate of %s has been revoked.\n"),
359 severity, quote (host));
363 if (gnutls_certificate_type_get (ctx->session) == GNUTLS_CRT_X509)
365 time_t now = time (NULL);
366 gnutls_x509_crt cert;
367 const gnutls_datum *cert_list;
368 unsigned int cert_list_size;
370 if ((err = gnutls_x509_crt_init (&cert)) < 0)
372 logprintf (LOG_NOTQUIET, _("Error initializing X509 certificate: %s\n"),
373 gnutls_strerror (err));
378 cert_list = gnutls_certificate_get_peers (ctx->session, &cert_list_size);
381 logprintf (LOG_NOTQUIET, _("No certificate found\n"));
385 err = gnutls_x509_crt_import (cert, cert_list, GNUTLS_X509_FMT_DER);
388 logprintf (LOG_NOTQUIET, _("Error parsing certificate: %s\n"),
389 gnutls_strerror (err));
393 if (now < gnutls_x509_crt_get_activation_time (cert))
395 logprintf (LOG_NOTQUIET, _("The certificate has not yet been activated\n"));
398 if (now >= gnutls_x509_crt_get_expiration_time (cert))
400 logprintf (LOG_NOTQUIET, _("The certificate has expired\n"));
403 if (!gnutls_x509_crt_check_hostname (cert, host))
405 logprintf (LOG_NOTQUIET,
406 _("The certificate's owner does not match hostname %s\n"),
410 gnutls_x509_crt_deinit (cert);
414 return opt.check_cert ? success : true;