2 Copyright (C) 2000 Free Software Foundation, Inc.
3 Contributed by Christian Fraenkel.
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 2 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, write to the Free Software
19 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
21 In addition, as a special exception, the Free Software Foundation
22 gives permission to link the code of its release of Wget with the
23 OpenSSL project's "OpenSSL" library (or with modified versions of it
24 that use the same license as the "OpenSSL" library), and distribute
25 the linked executables. You must obey the GNU General Public License
26 in all respects for all of the code used other than "OpenSSL". If you
27 modify this file, you may extend this exception to your version of the
28 file, but you are not obligated to do so. If you do not wish to do
29 so, delete this exception statement from your version. */
44 #include <openssl/bio.h>
45 #include <openssl/crypto.h>
46 #include <openssl/x509.h>
47 #include <openssl/ssl.h>
48 #include <openssl/err.h>
49 #include <openssl/pem.h>
50 #include <openssl/rand.h>
64 /* It is likely that older versions of OpenSSL will fail on
65 non-Linux machines because this code is unable to seed the PRNG
66 on older versions of the library. */
68 #if SSLEAY_VERSION_NUMBER >= 0x00905100
72 /* First, seed from a file specified by the user. This will be
73 $RANDFILE, if set, or ~/.rnd. */
74 RAND_file_name (rand_file, sizeof (rand_file));
76 /* Seed at most 16k (value borrowed from curl) from random file. */
77 RAND_load_file (rand_file, 16384);
82 /* Get random data from EGD if opt.sslegdsock was set. */
83 if (opt.sslegdsock && *opt.sslegdsock)
84 RAND_egd (opt.sslegdsock);
90 /* Under Windows, we can try to seed the PRNG using screen content.
91 This may or may not work, depending on whether we'll calling Wget
99 /* Still not enough randomness, presumably because neither random
100 file nor EGD have been available. Use the stupidest possible
101 method -- seed OpenSSL's PRNG with the system's PRNG. This is
102 insecure in the cryptographic sense, but people who care about
103 security will use /dev/random or their own source of randomness
106 while (RAND_status () == 0 && maxrand-- > 0)
108 unsigned char rnd = random_number (256);
109 RAND_seed (&rnd, sizeof (rnd));
112 if (RAND_status () == 0)
114 logprintf (LOG_NOTQUIET,
115 _("Could not seed OpenSSL PRNG; disabling SSL.\n"));
116 scheme_disable (SCHEME_HTTPS);
118 #endif /* SSLEAY_VERSION_NUMBER >= 0x00905100 */
122 verify_callback (int ok, X509_STORE_CTX *ctx)
125 s = X509_NAME_oneline (X509_get_subject_name (ctx->current_cert), buf, 256);
127 switch (ctx->error) {
128 case X509_V_ERR_CERT_NOT_YET_VALID:
129 case X509_V_ERR_CERT_HAS_EXPIRED:
130 /* This mean the CERT is not valid !!! */
133 case X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT:
134 /* Unsure if we should handle that this way */
142 /* pass all ssl errors to DEBUGP
143 returns the number of printed errors */
145 ssl_printerrors (void)
148 unsigned long curerr = 0;
151 while ((curerr = ERR_get_error ()) != 0)
153 DEBUGP (("OpenSSL: %s\n", ERR_error_string (curerr, errbuff)));
159 /* Creates a SSL Context and sets some defaults for it */
161 init_ssl (SSL_CTX **ctx)
163 SSL_METHOD *meth = NULL;
167 SSL_load_error_strings ();
168 SSLeay_add_all_algorithms ();
169 SSLeay_add_ssl_algorithms ();
170 switch (opt.sslprotocol)
173 meth = SSLv23_client_method ();
176 meth = SSLv2_client_method ();
179 meth = SSLv3_client_method ();
182 meth = TLSv1_client_method ();
188 return SSLERRCTXCREATE;
191 *ctx = SSL_CTX_new (meth);
195 return SSLERRCTXCREATE;
197 /* Can we validate the server Cert ? */
198 if (opt.sslcadir != NULL || opt.sslcafile != NULL)
200 SSL_CTX_load_verify_locations (*ctx, opt.sslcafile, opt.sslcadir);
208 if (!opt.sslcheckcert)
210 /* check cert but ignore error, do not break handshake on error */
211 verify = SSL_VERIFY_NONE;
217 logprintf (LOG_NOTQUIET, "Warrining validation of Server Cert not possible!\n");
218 verify = SSL_VERIFY_NONE;
222 /* break handshake if server cert is not valid but allow NO-Cert mode */
223 verify = SSL_VERIFY_PEER;
227 SSL_CTX_set_verify (*ctx, verify, verify_callback);
229 if (opt.sslcertfile != NULL || opt.sslcertkey != NULL)
232 if (!opt.sslcerttype)
233 ssl_cert_type = SSL_FILETYPE_PEM;
235 ssl_cert_type = SSL_FILETYPE_ASN1;
237 if (opt.sslcertkey == NULL)
238 opt.sslcertkey = opt.sslcertfile;
239 if (opt.sslcertfile == NULL)
240 opt.sslcertfile = opt.sslcertkey;
242 if (SSL_CTX_use_certificate_file (*ctx, opt.sslcertfile, ssl_cert_type) <= 0)
245 return SSLERRCERTFILE;
247 if (SSL_CTX_use_PrivateKey_file (*ctx, opt.sslcertkey , ssl_cert_type) <= 0)
250 return SSLERRCERTKEY;
254 return 0; /* Succeded */
258 int ssl_read (int fd, char *buf, int bufsize, void *ctx)
261 SSL *ssl = (SSL *) ctx;
262 /* #### Does SSL_read actually set EINTR? */
264 res = SSL_read (ssl, buf, bufsize);
265 while (res == -1 && errno == EINTR);
270 ssl_write (int fd, char *buf, int bufsize, void *ctx)
273 SSL *ssl = (SSL *) ctx;
274 /* #### Does SSL_write actually set EINTR? */
276 res = SSL_write (ssl, buf, bufsize);
277 while (res == -1 && errno == EINTR);
282 ssl_poll (int fd, double timeout, int wait_for, void *ctx)
284 SSL *ssl = (SSL *) ctx;
287 if (SSL_pending (ssl))
290 return select_fd (fd, timeout, wait_for);
297 ssl_close (int fd, void *ctx)
299 SSL *ssl = (SSL *) ctx;
309 DEBUGP (("Closed %d/SSL 0x%0lx\n", fd, (unsigned long) ssl));
312 /* Sets up a SSL structure and performs the handshake on fd. */
315 connect_ssl (int fd, SSL_CTX *ctx)
317 SSL *ssl = SSL_new (ctx);
320 if (!SSL_set_fd (ssl, fd))
322 SSL_set_connect_state (ssl);
323 if (SSL_connect (ssl) <= 0 || ssl->state != SSL_ST_OK)
326 /* Register the FD to use our functions for read, write, etc. That
327 way the rest of Wget can keep using xread, xwrite, and
329 register_extended (fd, ssl_read, ssl_write, ssl_poll, ssl_close, ssl);
330 DEBUGP (("Connected %d to SSL 0x%0lx\n", fd, (unsigned long) ssl));
341 free_ssl_ctx (SSL_CTX * ctx)