1 /* SSL support via GnuTLS library.
2 Copyright (C) 2005, 2006, 2007, 2008, 2009 Free Software Foundation,
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>
49 /* Note: some of the functions private to this file have names that
50 begin with "wgnutls_" (e.g. wgnutls_read) so that they wouldn't be
51 confused with actual gnutls functions -- such as the gnutls_read
52 preprocessor macro. */
54 static gnutls_certificate_credentials credentials;
59 gnutls_global_init ();
60 gnutls_certificate_allocate_credentials (&credentials);
62 gnutls_certificate_set_x509_trust_file (credentials, opt.ca_cert,
67 struct wgnutls_transport_context {
68 gnutls_session session; /* GnuTLS session handle */
69 int last_error; /* last error returned by read/write/... */
71 /* Since GnuTLS doesn't support the equivalent to recv(...,
72 MSG_PEEK) or SSL_peek(), we have to do it ourselves. Peeked data
73 is stored to PEEKBUF, and wgnutls_read checks that buffer before
76 int peekstart, peeklen;
80 # define MIN(i, j) ((i) <= (j) ? (i) : (j))
84 wgnutls_read (int fd, char *buf, int bufsize, void *arg)
87 struct wgnutls_transport_context *ctx = arg;
91 /* If we have any peek data, simply return that. */
92 int copysize = MIN (bufsize, ctx->peeklen);
93 memcpy (buf, ctx->peekbuf + ctx->peekstart, copysize);
94 ctx->peeklen -= copysize;
95 if (ctx->peeklen != 0)
96 ctx->peekstart += copysize;
103 ret = gnutls_record_recv (ctx->session, buf, bufsize);
104 while (ret == GNUTLS_E_INTERRUPTED);
107 ctx->last_error = ret;
112 wgnutls_write (int fd, char *buf, int bufsize, void *arg)
115 struct wgnutls_transport_context *ctx = arg;
117 ret = gnutls_record_send (ctx->session, buf, bufsize);
118 while (ret == GNUTLS_E_INTERRUPTED);
120 ctx->last_error = ret;
125 wgnutls_poll (int fd, double timeout, int wait_for, void *arg)
131 wgnutls_peek (int fd, char *buf, int bufsize, void *arg)
134 struct wgnutls_transport_context *ctx = arg;
136 /* We don't support peeks following peeks: the reader must drain all
137 peeked data before the next peek. */
138 assert (ctx->peeklen == 0);
139 if (bufsize > sizeof ctx->peekbuf)
140 bufsize = sizeof ctx->peekbuf;
143 ret = gnutls_record_recv (ctx->session, buf, bufsize);
144 while (ret == GNUTLS_E_INTERRUPTED);
148 memcpy (ctx->peekbuf, buf, ret);
155 wgnutls_errstr (int fd, void *arg)
157 struct wgnutls_transport_context *ctx = arg;
158 return gnutls_strerror (ctx->last_error);
162 wgnutls_close (int fd, void *arg)
164 struct wgnutls_transport_context *ctx = arg;
165 /*gnutls_bye (ctx->session, GNUTLS_SHUT_RDWR);*/
166 gnutls_deinit (ctx->session);
175 /* gnutls_transport is the singleton that describes the SSL transport
176 methods provided by this file. */
178 static struct transport_implementation wgnutls_transport = {
179 wgnutls_read, wgnutls_write, wgnutls_poll,
180 wgnutls_peek, wgnutls_errstr, wgnutls_close
186 static const int cert_type_priority[] = {
187 GNUTLS_CRT_X509, GNUTLS_CRT_OPENPGP, 0
189 struct wgnutls_transport_context *ctx;
190 gnutls_session session;
192 gnutls_init (&session, GNUTLS_CLIENT);
193 gnutls_set_default_priority (session);
194 gnutls_certificate_type_set_priority (session, cert_type_priority);
195 gnutls_credentials_set (session, GNUTLS_CRD_CERTIFICATE, credentials);
196 gnutls_transport_set_ptr (session, (gnutls_transport_ptr) fd);
197 err = gnutls_handshake (session);
200 logprintf (LOG_NOTQUIET, "GnuTLS: %s\n", gnutls_strerror (err));
201 gnutls_deinit (session);
204 ctx = xnew0 (struct wgnutls_transport_context);
205 ctx->session = session;
206 fd_register_transport (fd, &wgnutls_transport, ctx);
211 ssl_check_certificate (int fd, const char *host)
213 struct wgnutls_transport_context *ctx = fd_transport_context (fd);
218 /* If the user has specified --no-check-cert, we still want to warn
219 him about problems with the server's certificate. */
220 const char *severity = opt.check_cert ? _("ERROR") : _("WARNING");
223 err = gnutls_certificate_verify_peers2 (ctx->session, &status);
226 logprintf (LOG_NOTQUIET, _("%s: No certificate presented by %s.\n"),
227 severity, quotearg_style (escape_quoting_style, host));
232 if (status & GNUTLS_CERT_INVALID)
234 logprintf (LOG_NOTQUIET, _("%s: The certificate of %s is not trusted.\n"),
235 severity, quote (host));
238 if (status & GNUTLS_CERT_SIGNER_NOT_FOUND)
240 logprintf (LOG_NOTQUIET, _("%s: The certificate of %s hasn't got a known issuer.\n"),
241 severity, quote (host));
244 if (status & GNUTLS_CERT_REVOKED)
246 logprintf (LOG_NOTQUIET, _("%s: The certificate of %s has been revoked.\n"),
247 severity, quote (host));
251 if (gnutls_certificate_type_get (ctx->session) == GNUTLS_CRT_X509)
253 time_t now = time (NULL);
254 gnutls_x509_crt cert;
255 const gnutls_datum *cert_list;
256 unsigned int cert_list_size;
258 if ((err = gnutls_x509_crt_init (&cert)) < 0)
260 logprintf (LOG_NOTQUIET, _("Error initializing X509 certificate: %s\n"),
261 gnutls_strerror (err));
266 cert_list = gnutls_certificate_get_peers (ctx->session, &cert_list_size);
269 logprintf (LOG_NOTQUIET, _("No certificate found\n"));
273 err = gnutls_x509_crt_import (cert, cert_list, GNUTLS_X509_FMT_DER);
276 logprintf (LOG_NOTQUIET, _("Error parsing certificate: %s\n"),
277 gnutls_strerror (err));
281 if (now < gnutls_x509_crt_get_activation_time (cert))
283 logprintf (LOG_NOTQUIET, _("The certificate has not yet been activated\n"));
286 if (now >= gnutls_x509_crt_get_expiration_time (cert))
288 logprintf (LOG_NOTQUIET, _("The certificate has expired\n"));
291 if (!gnutls_x509_crt_check_hostname (cert, host))
293 logprintf (LOG_NOTQUIET,
294 _("The certificate's owner does not match hostname %s\n"),
298 gnutls_x509_crt_deinit (cert);
302 return opt.check_cert ? success : true;