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. */
42 #include <gnutls/gnutls.h>
43 #include <gnutls/x509.h>
54 /* Note: some of the functions private to this file have names that
55 begin with "wgnutls_" (e.g. wgnutls_read) so that they wouldn't be
56 confused with actual gnutls functions -- such as the gnutls_read
57 preprocessor macro. */
59 static gnutls_certificate_credentials credentials;
64 gnutls_global_init ();
65 gnutls_certificate_allocate_credentials (&credentials);
67 gnutls_certificate_set_x509_trust_file (credentials, opt.ca_cert,
72 struct wgnutls_transport_context {
73 gnutls_session session; /* GnuTLS session handle */
74 int last_error; /* last error returned by read/write/... */
76 /* Since GnuTLS doesn't support the equivalent to recv(...,
77 MSG_PEEK) or SSL_peek(), we have to do it ourselves. Peeked data
78 is stored to PEEKBUF, and wgnutls_read checks that buffer before
85 # define MIN(i, j) ((i) <= (j) ? (i) : (j))
89 wgnutls_read (int fd, char *buf, int bufsize, void *arg)
92 struct wgnutls_transport_context *ctx = arg;
96 /* If we have any peek data, simply return that. */
97 int copysize = MIN (bufsize, ctx->peeklen);
98 memcpy (buf, ctx->peekbuf, copysize);
99 ctx->peeklen -= copysize;
100 if (ctx->peeklen != 0)
101 memmove (ctx->peekbuf, ctx->peekbuf + copysize, ctx->peeklen);
107 ret = gnutls_record_recv (ctx->session, buf, bufsize);
108 while (ret == GNUTLS_E_INTERRUPTED);
111 ctx->last_error = ret;
116 wgnutls_write (int fd, char *buf, int bufsize, void *arg)
119 struct wgnutls_transport_context *ctx = arg;
121 ret = gnutls_record_send (ctx->session, buf, bufsize);
122 while (ret == GNUTLS_E_INTERRUPTED);
124 ctx->last_error = ret;
129 wgnutls_poll (int fd, double timeout, int wait_for, void *arg)
131 struct wgnutls_transport_context *ctx = arg;
132 return ctx->peeklen || gnutls_record_check_pending (ctx->session)
133 || select_fd (fd, timeout, wait_for);
137 wgnutls_peek (int fd, char *buf, int bufsize, void *arg)
140 struct wgnutls_transport_context *ctx = arg;
141 int offset = ctx->peeklen;
143 if (bufsize > sizeof ctx->peekbuf)
144 bufsize = sizeof ctx->peekbuf;
147 memcpy (buf, ctx->peekbuf, offset);
151 if (gnutls_record_check_pending (ctx->session)
152 || select_fd (fd, 0, WAIT_FOR_READ))
153 ret = gnutls_record_recv (ctx->session, buf + offset, bufsize - offset);
155 while (ret == GNUTLS_E_INTERRUPTED);
159 memcpy (ctx->peekbuf + offset, buf + offset, ret);
166 wgnutls_errstr (int fd, void *arg)
168 struct wgnutls_transport_context *ctx = arg;
169 return gnutls_strerror (ctx->last_error);
173 wgnutls_close (int fd, void *arg)
175 struct wgnutls_transport_context *ctx = arg;
176 /*gnutls_bye (ctx->session, GNUTLS_SHUT_RDWR);*/
177 gnutls_deinit (ctx->session);
182 /* gnutls_transport is the singleton that describes the SSL transport
183 methods provided by this file. */
185 static struct transport_implementation wgnutls_transport = {
186 wgnutls_read, wgnutls_write, wgnutls_poll,
187 wgnutls_peek, wgnutls_errstr, wgnutls_close
191 ssl_connect_wget (int fd)
193 static const int cert_type_priority[] = {
194 GNUTLS_CRT_X509, GNUTLS_CRT_OPENPGP, 0
196 struct wgnutls_transport_context *ctx;
197 gnutls_session session;
199 gnutls_init (&session, GNUTLS_CLIENT);
200 gnutls_set_default_priority (session);
201 gnutls_certificate_type_set_priority (session, cert_type_priority);
202 gnutls_credentials_set (session, GNUTLS_CRD_CERTIFICATE, credentials);
204 # define FD_TO_SOCKET(X) (X)
206 gnutls_transport_set_ptr (session, (gnutls_transport_ptr) FD_TO_SOCKET (fd));
207 err = gnutls_handshake (session);
210 logprintf (LOG_NOTQUIET, "GnuTLS: %s\n", gnutls_strerror (err));
211 gnutls_deinit (session);
214 ctx = xnew0 (struct wgnutls_transport_context);
215 ctx->session = session;
216 fd_register_transport (fd, &wgnutls_transport, ctx);
221 ssl_check_certificate (int fd, const char *host)
223 struct wgnutls_transport_context *ctx = fd_transport_context (fd);
228 /* If the user has specified --no-check-cert, we still want to warn
229 him about problems with the server's certificate. */
230 const char *severity = opt.check_cert ? _("ERROR") : _("WARNING");
233 err = gnutls_certificate_verify_peers2 (ctx->session, &status);
236 logprintf (LOG_NOTQUIET, _("%s: No certificate presented by %s.\n"),
237 severity, quotearg_style (escape_quoting_style, host));
242 if (status & GNUTLS_CERT_INVALID)
244 logprintf (LOG_NOTQUIET, _("%s: The certificate of %s is not trusted.\n"),
245 severity, quote (host));
248 if (status & GNUTLS_CERT_SIGNER_NOT_FOUND)
250 logprintf (LOG_NOTQUIET, _("%s: The certificate of %s hasn't got a known issuer.\n"),
251 severity, quote (host));
254 if (status & GNUTLS_CERT_REVOKED)
256 logprintf (LOG_NOTQUIET, _("%s: The certificate of %s has been revoked.\n"),
257 severity, quote (host));
261 if (gnutls_certificate_type_get (ctx->session) == GNUTLS_CRT_X509)
263 time_t now = time (NULL);
264 gnutls_x509_crt cert;
265 const gnutls_datum *cert_list;
266 unsigned int cert_list_size;
268 if ((err = gnutls_x509_crt_init (&cert)) < 0)
270 logprintf (LOG_NOTQUIET, _("Error initializing X509 certificate: %s\n"),
271 gnutls_strerror (err));
276 cert_list = gnutls_certificate_get_peers (ctx->session, &cert_list_size);
279 logprintf (LOG_NOTQUIET, _("No certificate found\n"));
283 err = gnutls_x509_crt_import (cert, cert_list, GNUTLS_X509_FMT_DER);
286 logprintf (LOG_NOTQUIET, _("Error parsing certificate: %s\n"),
287 gnutls_strerror (err));
291 if (now < gnutls_x509_crt_get_activation_time (cert))
293 logprintf (LOG_NOTQUIET, _("The certificate has not yet been activated\n"));
296 if (now >= gnutls_x509_crt_get_expiration_time (cert))
298 logprintf (LOG_NOTQUIET, _("The certificate has expired\n"));
301 if (!gnutls_x509_crt_check_hostname (cert, host))
303 logprintf (LOG_NOTQUIET,
304 _("The certificate's owner does not match hostname %s\n"),
308 gnutls_x509_crt_deinit (cert);
312 return opt.check_cert ? success : true;