1 /* SSL support via GnuTLS library.
2 Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010 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. */
43 #include <gnutls/gnutls.h>
44 #include <gnutls/x509.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 {
108 gnutls_session session; /* GnuTLS session handle */
109 int last_error; /* last error returned by read/write/... */
111 /* Since GnuTLS doesn't support the equivalent to recv(...,
112 MSG_PEEK) or SSL_peek(), we have to do it ourselves. Peeked data
113 is stored to PEEKBUF, and wgnutls_read checks that buffer before
120 # define MIN(i, j) ((i) <= (j) ? (i) : (j))
124 wgnutls_read (int fd, char *buf, int bufsize, void *arg)
127 struct wgnutls_transport_context *ctx = arg;
131 /* If we have any peek data, simply return that. */
132 int copysize = MIN (bufsize, ctx->peeklen);
133 memcpy (buf, ctx->peekbuf, copysize);
134 ctx->peeklen -= copysize;
135 if (ctx->peeklen != 0)
136 memmove (ctx->peekbuf, ctx->peekbuf + copysize, ctx->peeklen);
142 ret = gnutls_record_recv (ctx->session, buf, bufsize);
143 while (ret == GNUTLS_E_INTERRUPTED);
146 ctx->last_error = ret;
151 wgnutls_write (int fd, char *buf, int bufsize, void *arg)
154 struct wgnutls_transport_context *ctx = arg;
156 ret = gnutls_record_send (ctx->session, buf, bufsize);
157 while (ret == GNUTLS_E_INTERRUPTED);
159 ctx->last_error = ret;
164 wgnutls_poll (int fd, double timeout, int wait_for, void *arg)
166 struct wgnutls_transport_context *ctx = arg;
167 return ctx->peeklen || gnutls_record_check_pending (ctx->session)
168 || select_fd (fd, timeout, wait_for);
172 wgnutls_peek (int fd, char *buf, int bufsize, void *arg)
175 struct wgnutls_transport_context *ctx = arg;
176 int offset = MIN (bufsize, ctx->peeklen);
177 if (bufsize > sizeof ctx->peekbuf)
178 bufsize = sizeof ctx->peekbuf;
181 memcpy (buf, ctx->peekbuf, offset);
183 if (bufsize > offset)
187 ret = gnutls_record_recv (ctx->session, buf + offset,
190 while (ret == GNUTLS_E_INTERRUPTED);
197 memcpy (ctx->peekbuf + offset, buf + offset,
207 wgnutls_errstr (int fd, void *arg)
209 struct wgnutls_transport_context *ctx = arg;
210 return gnutls_strerror (ctx->last_error);
214 wgnutls_close (int fd, void *arg)
216 struct wgnutls_transport_context *ctx = arg;
217 /*gnutls_bye (ctx->session, GNUTLS_SHUT_RDWR);*/
218 gnutls_deinit (ctx->session);
223 /* gnutls_transport is the singleton that describes the SSL transport
224 methods provided by this file. */
226 static struct transport_implementation wgnutls_transport = {
227 wgnutls_read, wgnutls_write, wgnutls_poll,
228 wgnutls_peek, wgnutls_errstr, wgnutls_close
232 ssl_connect_wget (int fd)
234 static const int cert_type_priority[] = {
235 GNUTLS_CRT_X509, GNUTLS_CRT_OPENPGP, 0
237 struct wgnutls_transport_context *ctx;
238 gnutls_session session;
240 int allowed_protocols[4] = {0, 0, 0, 0};
241 gnutls_init (&session, GNUTLS_CLIENT);
242 gnutls_set_default_priority (session);
243 gnutls_certificate_type_set_priority (session, cert_type_priority);
244 gnutls_credentials_set (session, GNUTLS_CRD_CERTIFICATE, credentials);
246 # define FD_TO_SOCKET(X) (X)
248 gnutls_transport_set_ptr (session, (gnutls_transport_ptr) FD_TO_SOCKET (fd));
251 switch (opt.secure_protocol)
253 case secure_protocol_auto:
255 case secure_protocol_sslv2:
256 case secure_protocol_sslv3:
257 allowed_protocols[0] = GNUTLS_SSL3;
258 err = gnutls_protocol_set_priority (session, allowed_protocols);
260 case secure_protocol_tlsv1:
261 allowed_protocols[0] = GNUTLS_TLS1_0;
262 allowed_protocols[1] = GNUTLS_TLS1_1;
263 allowed_protocols[2] = GNUTLS_TLS1_2;
264 err = gnutls_protocol_set_priority (session, allowed_protocols);
271 logprintf (LOG_NOTQUIET, "GnuTLS: %s\n", gnutls_strerror (err));
272 gnutls_deinit (session);
276 err = gnutls_handshake (session);
279 logprintf (LOG_NOTQUIET, "GnuTLS: %s\n", gnutls_strerror (err));
280 gnutls_deinit (session);
284 ctx = xnew0 (struct wgnutls_transport_context);
285 ctx->session = session;
286 fd_register_transport (fd, &wgnutls_transport, ctx);
291 ssl_check_certificate (int fd, const char *host)
293 struct wgnutls_transport_context *ctx = fd_transport_context (fd);
298 /* If the user has specified --no-check-cert, we still want to warn
299 him about problems with the server's certificate. */
300 const char *severity = opt.check_cert ? _("ERROR") : _("WARNING");
303 err = gnutls_certificate_verify_peers2 (ctx->session, &status);
306 logprintf (LOG_NOTQUIET, _("%s: No certificate presented by %s.\n"),
307 severity, quotearg_style (escape_quoting_style, host));
312 if (status & GNUTLS_CERT_INVALID)
314 logprintf (LOG_NOTQUIET, _("%s: The certificate of %s is not trusted.\n"),
315 severity, quote (host));
318 if (status & GNUTLS_CERT_SIGNER_NOT_FOUND)
320 logprintf (LOG_NOTQUIET, _("%s: The certificate of %s hasn't got a known issuer.\n"),
321 severity, quote (host));
324 if (status & GNUTLS_CERT_REVOKED)
326 logprintf (LOG_NOTQUIET, _("%s: The certificate of %s has been revoked.\n"),
327 severity, quote (host));
331 if (gnutls_certificate_type_get (ctx->session) == GNUTLS_CRT_X509)
333 time_t now = time (NULL);
334 gnutls_x509_crt cert;
335 const gnutls_datum *cert_list;
336 unsigned int cert_list_size;
338 if ((err = gnutls_x509_crt_init (&cert)) < 0)
340 logprintf (LOG_NOTQUIET, _("Error initializing X509 certificate: %s\n"),
341 gnutls_strerror (err));
346 cert_list = gnutls_certificate_get_peers (ctx->session, &cert_list_size);
349 logprintf (LOG_NOTQUIET, _("No certificate found\n"));
353 err = gnutls_x509_crt_import (cert, cert_list, GNUTLS_X509_FMT_DER);
356 logprintf (LOG_NOTQUIET, _("Error parsing certificate: %s\n"),
357 gnutls_strerror (err));
361 if (now < gnutls_x509_crt_get_activation_time (cert))
363 logprintf (LOG_NOTQUIET, _("The certificate has not yet been activated\n"));
366 if (now >= gnutls_x509_crt_get_expiration_time (cert))
368 logprintf (LOG_NOTQUIET, _("The certificate has expired\n"));
371 if (!gnutls_x509_crt_check_hostname (cert, host))
373 logprintf (LOG_NOTQUIET,
374 _("The certificate's owner does not match hostname %s\n"),
378 gnutls_x509_crt_deinit (cert);
382 return opt.check_cert ? success : true;