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 = ctx->peeklen;
178 if (bufsize > sizeof ctx->peekbuf)
179 bufsize = sizeof ctx->peekbuf;
182 memcpy (buf, ctx->peekbuf, offset);
186 if (gnutls_record_check_pending (ctx->session)
187 || select_fd (fd, 0, WAIT_FOR_READ))
188 ret = gnutls_record_recv (ctx->session, buf + offset, bufsize - offset);
190 while (ret == GNUTLS_E_INTERRUPTED);
194 memcpy (ctx->peekbuf + offset, buf + offset, ret);
201 wgnutls_errstr (int fd, void *arg)
203 struct wgnutls_transport_context *ctx = arg;
204 return gnutls_strerror (ctx->last_error);
208 wgnutls_close (int fd, void *arg)
210 struct wgnutls_transport_context *ctx = arg;
211 /*gnutls_bye (ctx->session, GNUTLS_SHUT_RDWR);*/
212 gnutls_deinit (ctx->session);
217 /* gnutls_transport is the singleton that describes the SSL transport
218 methods provided by this file. */
220 static struct transport_implementation wgnutls_transport = {
221 wgnutls_read, wgnutls_write, wgnutls_poll,
222 wgnutls_peek, wgnutls_errstr, wgnutls_close
226 ssl_connect_wget (int fd)
228 static const int cert_type_priority[] = {
229 GNUTLS_CRT_X509, GNUTLS_CRT_OPENPGP, 0
231 struct wgnutls_transport_context *ctx;
232 gnutls_session session;
234 int allowed_protocols[4] = {0, 0, 0, 0};
235 gnutls_init (&session, GNUTLS_CLIENT);
236 gnutls_set_default_priority (session);
237 gnutls_certificate_type_set_priority (session, cert_type_priority);
238 gnutls_credentials_set (session, GNUTLS_CRD_CERTIFICATE, credentials);
240 # define FD_TO_SOCKET(X) (X)
242 gnutls_transport_set_ptr (session, (gnutls_transport_ptr) FD_TO_SOCKET (fd));
245 switch (opt.secure_protocol)
247 case secure_protocol_auto:
249 case secure_protocol_sslv2:
250 case secure_protocol_sslv3:
251 allowed_protocols[0] = GNUTLS_SSL3;
252 err = gnutls_protocol_set_priority (session, allowed_protocols);
254 case secure_protocol_tlsv1:
255 allowed_protocols[0] = GNUTLS_TLS1_0;
256 allowed_protocols[1] = GNUTLS_TLS1_1;
257 allowed_protocols[2] = GNUTLS_TLS1_2;
258 err = gnutls_protocol_set_priority (session, allowed_protocols);
265 logprintf (LOG_NOTQUIET, "GnuTLS: %s\n", gnutls_strerror (err));
266 gnutls_deinit (session);
270 err = gnutls_handshake (session);
273 logprintf (LOG_NOTQUIET, "GnuTLS: %s\n", gnutls_strerror (err));
274 gnutls_deinit (session);
278 ctx = xnew0 (struct wgnutls_transport_context);
279 ctx->session = session;
280 fd_register_transport (fd, &wgnutls_transport, ctx);
285 ssl_check_certificate (int fd, const char *host)
287 struct wgnutls_transport_context *ctx = fd_transport_context (fd);
292 /* If the user has specified --no-check-cert, we still want to warn
293 him about problems with the server's certificate. */
294 const char *severity = opt.check_cert ? _("ERROR") : _("WARNING");
297 err = gnutls_certificate_verify_peers2 (ctx->session, &status);
300 logprintf (LOG_NOTQUIET, _("%s: No certificate presented by %s.\n"),
301 severity, quotearg_style (escape_quoting_style, host));
306 if (status & GNUTLS_CERT_INVALID)
308 logprintf (LOG_NOTQUIET, _("%s: The certificate of %s is not trusted.\n"),
309 severity, quote (host));
312 if (status & GNUTLS_CERT_SIGNER_NOT_FOUND)
314 logprintf (LOG_NOTQUIET, _("%s: The certificate of %s hasn't got a known issuer.\n"),
315 severity, quote (host));
318 if (status & GNUTLS_CERT_REVOKED)
320 logprintf (LOG_NOTQUIET, _("%s: The certificate of %s has been revoked.\n"),
321 severity, quote (host));
325 if (gnutls_certificate_type_get (ctx->session) == GNUTLS_CRT_X509)
327 time_t now = time (NULL);
328 gnutls_x509_crt cert;
329 const gnutls_datum *cert_list;
330 unsigned int cert_list_size;
332 if ((err = gnutls_x509_crt_init (&cert)) < 0)
334 logprintf (LOG_NOTQUIET, _("Error initializing X509 certificate: %s\n"),
335 gnutls_strerror (err));
340 cert_list = gnutls_certificate_get_peers (ctx->session, &cert_list_size);
343 logprintf (LOG_NOTQUIET, _("No certificate found\n"));
347 err = gnutls_x509_crt_import (cert, cert_list, GNUTLS_X509_FMT_DER);
350 logprintf (LOG_NOTQUIET, _("Error parsing certificate: %s\n"),
351 gnutls_strerror (err));
355 if (now < gnutls_x509_crt_get_activation_time (cert))
357 logprintf (LOG_NOTQUIET, _("The certificate has not yet been activated\n"));
360 if (now >= gnutls_x509_crt_get_expiration_time (cert))
362 logprintf (LOG_NOTQUIET, _("The certificate has expired\n"));
365 if (!gnutls_x509_crt_check_hostname (cert, host))
367 logprintf (LOG_NOTQUIET,
368 _("The certificate's owner does not match hostname %s\n"),
372 gnutls_x509_crt_deinit (cert);
376 return opt.check_cert ? success : true;