1 /* SSL support via GnuTLS library.
2 Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010, 2011 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. */
41 #include <gnutls/gnutls.h>
42 #include <gnutls/x509.h>
43 #include <sys/ioctl.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 const char *ca_directory;
67 gnutls_global_init ();
68 gnutls_certificate_allocate_credentials (&credentials);
69 gnutls_certificate_set_verify_flags(credentials,
70 GNUTLS_VERIFY_ALLOW_X509_V1_CA_CRT);
72 ca_directory = opt.ca_directory ? opt.ca_directory : "/etc/ssl/certs";
74 dir = opendir (ca_directory);
78 logprintf (LOG_NOTQUIET, _("ERROR: Cannot open directory %s.\n"),
84 while ((dent = readdir (dir)) != NULL)
88 asprintf (&ca_file, "%s/%s", ca_directory, dent->d_name);
92 if (S_ISREG (st.st_mode))
93 gnutls_certificate_set_x509_trust_file (credentials, ca_file,
103 gnutls_certificate_set_x509_trust_file (credentials, opt.ca_cert,
104 GNUTLS_X509_FMT_PEM);
108 struct wgnutls_transport_context
110 gnutls_session session; /* GnuTLS session handle */
111 int last_error; /* last error returned by read/write/... */
113 /* Since GnuTLS doesn't support the equivalent to recv(...,
114 MSG_PEEK) or SSL_peek(), we have to do it ourselves. Peeked data
115 is stored to PEEKBUF, and wgnutls_read checks that buffer before
122 # define MIN(i, j) ((i) <= (j) ? (i) : (j))
126 wgnutls_read (int fd, char *buf, int bufsize, void *arg)
129 struct wgnutls_transport_context *ctx = arg;
133 /* If we have any peek data, simply return that. */
134 int copysize = MIN (bufsize, ctx->peeklen);
135 memcpy (buf, ctx->peekbuf, copysize);
136 ctx->peeklen -= copysize;
137 if (ctx->peeklen != 0)
138 memmove (ctx->peekbuf, ctx->peekbuf + copysize, ctx->peeklen);
144 ret = gnutls_record_recv (ctx->session, buf, bufsize);
145 while (ret == GNUTLS_E_INTERRUPTED || ret == GNUTLS_E_AGAIN);
148 ctx->last_error = ret;
154 wgnutls_write (int fd, char *buf, int bufsize, void *arg)
157 struct wgnutls_transport_context *ctx = arg;
159 ret = gnutls_record_send (ctx->session, buf, bufsize);
160 while (ret == GNUTLS_E_INTERRUPTED || ret == GNUTLS_E_AGAIN);
162 ctx->last_error = ret;
167 wgnutls_poll (int fd, double timeout, int wait_for, void *arg)
169 struct wgnutls_transport_context *ctx = arg;
170 return ctx->peeklen || gnutls_record_check_pending (ctx->session)
171 || select_fd (fd, timeout, wait_for);
175 wgnutls_peek (int fd, char *buf, int bufsize, void *arg)
178 struct wgnutls_transport_context *ctx = arg;
179 int offset = MIN (bufsize, ctx->peeklen);
180 if (bufsize > sizeof ctx->peekbuf)
181 bufsize = sizeof ctx->peekbuf;
184 memcpy (buf, ctx->peekbuf, offset);
186 if (bufsize > offset)
188 if (gnutls_record_check_pending (ctx->session) <= 0
189 && select_fd (fd, 0.0, WAIT_FOR_READ) <= 0)
192 read = gnutls_record_recv (ctx->session, buf + offset,
205 memcpy (ctx->peekbuf + offset, buf + offset,
207 ctx->peeklen += read;
211 return offset + read;
215 wgnutls_errstr (int fd, void *arg)
217 struct wgnutls_transport_context *ctx = arg;
218 return gnutls_strerror (ctx->last_error);
222 wgnutls_close (int fd, void *arg)
224 struct wgnutls_transport_context *ctx = arg;
225 /*gnutls_bye (ctx->session, GNUTLS_SHUT_RDWR);*/
226 gnutls_deinit (ctx->session);
231 /* gnutls_transport is the singleton that describes the SSL transport
232 methods provided by this file. */
234 static struct transport_implementation wgnutls_transport =
236 wgnutls_read, wgnutls_write, wgnutls_poll,
237 wgnutls_peek, wgnutls_errstr, wgnutls_close
241 ssl_connect_wget (int fd)
243 struct wgnutls_transport_context *ctx;
244 gnutls_session session;
246 gnutls_init (&session, GNUTLS_CLIENT);
247 gnutls_set_default_priority (session);
248 gnutls_credentials_set (session, GNUTLS_CRD_CERTIFICATE, credentials);
250 # define FD_TO_SOCKET(X) (X)
252 gnutls_transport_set_ptr (session, (gnutls_transport_ptr) FD_TO_SOCKET (fd));
255 #if HAVE_GNUTLS_PRIORITY_SET_DIRECT
256 switch (opt.secure_protocol)
258 case secure_protocol_auto:
260 case secure_protocol_sslv2:
261 case secure_protocol_sslv3:
262 err = gnutls_priority_set_direct (session, "NORMAL:-VERS-TLS-ALL", NULL);
264 case secure_protocol_tlsv1:
265 err = gnutls_priority_set_direct (session, "NORMAL:-VERS-SSL3.0", NULL);
271 int allowed_protocols[4] = {0, 0, 0, 0};
272 switch (opt.secure_protocol)
274 case secure_protocol_auto:
276 case secure_protocol_sslv2:
277 case secure_protocol_sslv3:
278 allowed_protocols[0] = GNUTLS_SSL3;
279 err = gnutls_protocol_set_priority (session, allowed_protocols);
282 case secure_protocol_tlsv1:
283 allowed_protocols[0] = GNUTLS_TLS1_0;
284 allowed_protocols[1] = GNUTLS_TLS1_1;
285 allowed_protocols[2] = GNUTLS_TLS1_2;
286 err = gnutls_protocol_set_priority (session, allowed_protocols);
296 logprintf (LOG_NOTQUIET, "GnuTLS: %s\n", gnutls_strerror (err));
297 gnutls_deinit (session);
301 err = gnutls_handshake (session);
304 logprintf (LOG_NOTQUIET, "GnuTLS: %s\n", gnutls_strerror (err));
305 gnutls_deinit (session);
309 ctx = xnew0 (struct wgnutls_transport_context);
310 ctx->session = session;
311 fd_register_transport (fd, &wgnutls_transport, ctx);
316 ssl_check_certificate (int fd, const char *host)
318 struct wgnutls_transport_context *ctx = fd_transport_context (fd);
323 /* If the user has specified --no-check-cert, we still want to warn
324 him about problems with the server's certificate. */
325 const char *severity = opt.check_cert ? _("ERROR") : _("WARNING");
328 err = gnutls_certificate_verify_peers2 (ctx->session, &status);
331 logprintf (LOG_NOTQUIET, _("%s: No certificate presented by %s.\n"),
332 severity, quotearg_style (escape_quoting_style, host));
337 if (status & GNUTLS_CERT_INVALID)
339 logprintf (LOG_NOTQUIET, _("%s: The certificate of %s is not trusted.\n"),
340 severity, quote (host));
343 if (status & GNUTLS_CERT_SIGNER_NOT_FOUND)
345 logprintf (LOG_NOTQUIET, _("%s: The certificate of %s hasn't got a known issuer.\n"),
346 severity, quote (host));
349 if (status & GNUTLS_CERT_REVOKED)
351 logprintf (LOG_NOTQUIET, _("%s: The certificate of %s has been revoked.\n"),
352 severity, quote (host));
356 if (gnutls_certificate_type_get (ctx->session) == GNUTLS_CRT_X509)
358 time_t now = time (NULL);
359 gnutls_x509_crt cert;
360 const gnutls_datum *cert_list;
361 unsigned int cert_list_size;
363 if ((err = gnutls_x509_crt_init (&cert)) < 0)
365 logprintf (LOG_NOTQUIET, _("Error initializing X509 certificate: %s\n"),
366 gnutls_strerror (err));
371 cert_list = gnutls_certificate_get_peers (ctx->session, &cert_list_size);
374 logprintf (LOG_NOTQUIET, _("No certificate found\n"));
378 err = gnutls_x509_crt_import (cert, cert_list, GNUTLS_X509_FMT_DER);
381 logprintf (LOG_NOTQUIET, _("Error parsing certificate: %s\n"),
382 gnutls_strerror (err));
386 if (now < gnutls_x509_crt_get_activation_time (cert))
388 logprintf (LOG_NOTQUIET, _("The certificate has not yet been activated\n"));
391 if (now >= gnutls_x509_crt_get_expiration_time (cert))
393 logprintf (LOG_NOTQUIET, _("The certificate has expired\n"));
396 if (!gnutls_x509_crt_check_hostname (cert, host))
398 logprintf (LOG_NOTQUIET,
399 _("The certificate's owner does not match hostname %s\n"),
403 gnutls_x509_crt_deinit (cert);
407 return opt.check_cert ? success : true;