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>
66 /* It is likely that older versions of OpenSSL will fail on
67 non-Linux machines because this code is unable to seed the PRNG
68 on older versions of the library. */
70 #if SSLEAY_VERSION_NUMBER >= 0x00905100
74 /* First, seed from a file specified by the user. This will be
75 $RANDFILE, if set, or ~/.rnd. */
76 RAND_file_name (rand_file, sizeof (rand_file));
78 /* Seed at most 16k (value borrowed from curl) from random file. */
79 RAND_load_file (rand_file, 16384);
84 /* Get random data from EGD if opt.sslegdsock was set. */
85 if (opt.sslegdsock && *opt.sslegdsock)
86 RAND_egd (opt.sslegdsock);
92 /* Under Windows, we can try to seed the PRNG using screen content.
93 This may or may not work, depending on whether we'll calling Wget
101 /* Still not enough randomness, presumably because neither random
102 file nor EGD have been available. Use the stupidest possible
103 method -- seed OpenSSL's PRNG with the system's PRNG. This is
104 insecure in the cryptographic sense, but people who care about
105 security will use /dev/random or their own source of randomness
108 while (RAND_status () == 0 && maxrand-- > 0)
110 unsigned char rnd = random_number (256);
111 RAND_seed (&rnd, sizeof (rnd));
113 #endif /* SSLEAY_VERSION_NUMBER >= 0x00905100 */
117 verify_callback (int ok, X509_STORE_CTX *ctx)
120 s = X509_NAME_oneline (X509_get_subject_name (ctx->current_cert), buf, 256);
122 switch (ctx->error) {
123 case X509_V_ERR_CERT_NOT_YET_VALID:
124 case X509_V_ERR_CERT_HAS_EXPIRED:
125 /* This mean the CERT is not valid !!! */
128 case X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT:
129 /* Unsure if we should handle that this way */
137 /* Print SSL errors. */
140 ssl_print_errors (void)
142 unsigned long curerr = 0;
145 while ((curerr = ERR_get_error ()) != 0)
146 logprintf (LOG_NOTQUIET, "OpenSSL: %s\n",
147 ERR_error_string (curerr, errbuff));
150 /* Creates a SSL Context and sets some defaults for it */
154 SSL_METHOD *meth = NULL;
161 /* Init the PRNG. If that fails, bail out. */
163 if (RAND_status () == 0)
165 logprintf (LOG_NOTQUIET,
166 _("Could not seed OpenSSL PRNG; disabling SSL.\n"));
167 scheme_disable (SCHEME_HTTPS);
168 return SSLERRCTXCREATE;
172 SSL_load_error_strings ();
173 SSLeay_add_all_algorithms ();
174 SSLeay_add_ssl_algorithms ();
175 switch (opt.sslprotocol)
178 meth = SSLv23_client_method ();
181 meth = SSLv2_client_method ();
184 meth = SSLv3_client_method ();
187 meth = TLSv1_client_method ();
193 return SSLERRCTXCREATE;
196 ssl_ctx = SSL_CTX_new (meth);
200 return SSLERRCTXCREATE;
202 /* Can we validate the server Cert ? */
203 if (opt.sslcadir != NULL || opt.sslcafile != NULL)
205 SSL_CTX_load_verify_locations (ssl_ctx, opt.sslcafile, opt.sslcadir);
213 if (!opt.sslcheckcert)
215 /* check cert but ignore error, do not break handshake on error */
216 verify = SSL_VERIFY_NONE;
222 logprintf (LOG_NOTQUIET, "Warrining validation of Server Cert not possible!\n");
223 verify = SSL_VERIFY_NONE;
227 /* break handshake if server cert is not valid but allow NO-Cert mode */
228 verify = SSL_VERIFY_PEER;
232 SSL_CTX_set_verify (ssl_ctx, verify, verify_callback);
234 if (opt.sslcertfile != NULL || opt.sslcertkey != NULL)
237 if (!opt.sslcerttype)
238 ssl_cert_type = SSL_FILETYPE_PEM;
240 ssl_cert_type = SSL_FILETYPE_ASN1;
242 if (opt.sslcertkey == NULL)
243 opt.sslcertkey = opt.sslcertfile;
244 if (opt.sslcertfile == NULL)
245 opt.sslcertfile = opt.sslcertkey;
247 if (SSL_CTX_use_certificate_file (ssl_ctx, opt.sslcertfile,
251 return SSLERRCERTFILE;
253 if (SSL_CTX_use_PrivateKey_file (ssl_ctx, opt.sslcertkey,
257 return SSLERRCERTKEY;
261 return 0; /* Succeded */
265 ssl_read (int fd, char *buf, int bufsize, void *ctx)
268 SSL *ssl = (SSL *) ctx;
270 ret = SSL_read (ssl, buf, bufsize);
272 && SSL_get_error (ssl, ret) == SSL_ERROR_SYSCALL
278 ssl_write (int fd, char *buf, int bufsize, void *ctx)
281 SSL *ssl = (SSL *) ctx;
283 ret = SSL_write (ssl, buf, bufsize);
285 && SSL_get_error (ssl, ret) == SSL_ERROR_SYSCALL
291 ssl_poll (int fd, double timeout, int wait_for, void *ctx)
293 SSL *ssl = (SSL *) ctx;
296 if (SSL_pending (ssl))
299 return select_fd (fd, timeout, wait_for);
306 ssl_close (int fd, void *ctx)
308 SSL *ssl = (SSL *) ctx;
318 DEBUGP (("Closed %d/SSL 0x%0lx\n", fd, (unsigned long) ssl));
321 /* Sets up a SSL structure and performs the handshake on fd. */
328 assert (ssl_ctx != NULL);
329 ssl = SSL_new (ssl_ctx);
332 if (!SSL_set_fd (ssl, fd))
334 SSL_set_connect_state (ssl);
335 if (SSL_connect (ssl) <= 0 || ssl->state != SSL_ST_OK)
338 /* Register the FD to use our functions for read, write, etc. That
339 way the rest of Wget can keep using xread, xwrite, and
341 register_extended (fd, ssl_read, ssl_write, ssl_poll, ssl_close, ssl);
342 DEBUGP (("Connected %d to SSL 0x%0lx\n", fd, (unsigned long) ssl));