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
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 ret = gnutls_record_recv (ctx->session, buf + offset,
192 while (ret == GNUTLS_E_INTERRUPTED);
204 memcpy (ctx->peekbuf + offset, buf + offset,
214 wgnutls_errstr (int fd, void *arg)
216 struct wgnutls_transport_context *ctx = arg;
217 return gnutls_strerror (ctx->last_error);
221 wgnutls_close (int fd, void *arg)
223 struct wgnutls_transport_context *ctx = arg;
224 /*gnutls_bye (ctx->session, GNUTLS_SHUT_RDWR);*/
225 gnutls_deinit (ctx->session);
230 /* gnutls_transport is the singleton that describes the SSL transport
231 methods provided by this file. */
233 static struct transport_implementation wgnutls_transport =
235 wgnutls_read, wgnutls_write, wgnutls_poll,
236 wgnutls_peek, wgnutls_errstr, wgnutls_close
240 ssl_connect_wget (int fd)
242 static const int cert_type_priority[] = {
243 GNUTLS_CRT_X509, GNUTLS_CRT_OPENPGP, 0
245 struct wgnutls_transport_context *ctx;
246 gnutls_session session;
248 int allowed_protocols[4] = {0, 0, 0, 0};
249 gnutls_init (&session, GNUTLS_CLIENT);
250 gnutls_set_default_priority (session);
251 gnutls_certificate_type_set_priority (session, cert_type_priority);
252 gnutls_credentials_set (session, GNUTLS_CRD_CERTIFICATE, credentials);
254 # define FD_TO_SOCKET(X) (X)
256 gnutls_transport_set_ptr (session, (gnutls_transport_ptr) FD_TO_SOCKET (fd));
259 switch (opt.secure_protocol)
261 case secure_protocol_auto:
263 case secure_protocol_sslv2:
264 case secure_protocol_sslv3:
265 allowed_protocols[0] = GNUTLS_SSL3;
266 err = gnutls_protocol_set_priority (session, allowed_protocols);
268 case secure_protocol_tlsv1:
269 allowed_protocols[0] = GNUTLS_TLS1_0;
270 allowed_protocols[1] = GNUTLS_TLS1_1;
271 allowed_protocols[2] = GNUTLS_TLS1_2;
272 err = gnutls_protocol_set_priority (session, allowed_protocols);
279 logprintf (LOG_NOTQUIET, "GnuTLS: %s\n", gnutls_strerror (err));
280 gnutls_deinit (session);
284 err = gnutls_handshake (session);
287 logprintf (LOG_NOTQUIET, "GnuTLS: %s\n", gnutls_strerror (err));
288 gnutls_deinit (session);
292 ctx = xnew0 (struct wgnutls_transport_context);
293 ctx->session = session;
294 fd_register_transport (fd, &wgnutls_transport, ctx);
299 ssl_check_certificate (int fd, const char *host)
301 struct wgnutls_transport_context *ctx = fd_transport_context (fd);
306 /* If the user has specified --no-check-cert, we still want to warn
307 him about problems with the server's certificate. */
308 const char *severity = opt.check_cert ? _("ERROR") : _("WARNING");
311 err = gnutls_certificate_verify_peers2 (ctx->session, &status);
314 logprintf (LOG_NOTQUIET, _("%s: No certificate presented by %s.\n"),
315 severity, quotearg_style (escape_quoting_style, host));
320 if (status & GNUTLS_CERT_INVALID)
322 logprintf (LOG_NOTQUIET, _("%s: The certificate of %s is not trusted.\n"),
323 severity, quote (host));
326 if (status & GNUTLS_CERT_SIGNER_NOT_FOUND)
328 logprintf (LOG_NOTQUIET, _("%s: The certificate of %s hasn't got a known issuer.\n"),
329 severity, quote (host));
332 if (status & GNUTLS_CERT_REVOKED)
334 logprintf (LOG_NOTQUIET, _("%s: The certificate of %s has been revoked.\n"),
335 severity, quote (host));
339 if (gnutls_certificate_type_get (ctx->session) == GNUTLS_CRT_X509)
341 time_t now = time (NULL);
342 gnutls_x509_crt cert;
343 const gnutls_datum *cert_list;
344 unsigned int cert_list_size;
346 if ((err = gnutls_x509_crt_init (&cert)) < 0)
348 logprintf (LOG_NOTQUIET, _("Error initializing X509 certificate: %s\n"),
349 gnutls_strerror (err));
354 cert_list = gnutls_certificate_get_peers (ctx->session, &cert_list_size);
357 logprintf (LOG_NOTQUIET, _("No certificate found\n"));
361 err = gnutls_x509_crt_import (cert, cert_list, GNUTLS_X509_FMT_DER);
364 logprintf (LOG_NOTQUIET, _("Error parsing certificate: %s\n"),
365 gnutls_strerror (err));
369 if (now < gnutls_x509_crt_get_activation_time (cert))
371 logprintf (LOG_NOTQUIET, _("The certificate has not yet been activated\n"));
374 if (now >= gnutls_x509_crt_get_expiration_time (cert))
376 logprintf (LOG_NOTQUIET, _("The certificate has expired\n"));
379 if (!gnutls_x509_crt_check_hostname (cert, host))
381 logprintf (LOG_NOTQUIET,
382 _("The certificate's owner does not match hostname %s\n"),
386 gnutls_x509_crt_deinit (cert);
390 return opt.check_cert ? success : true;