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. */
46 #include <openssl/bio.h>
47 #include <openssl/crypto.h>
48 #include <openssl/x509.h>
49 #include <openssl/ssl.h>
50 #include <openssl/err.h>
51 #include <openssl/pem.h>
52 #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));
114 if (RAND_status () == 0)
116 logprintf (LOG_NOTQUIET,
117 _("Could not seed OpenSSL PRNG; disabling SSL.\n"));
118 scheme_disable (SCHEME_HTTPS);
120 #endif /* SSLEAY_VERSION_NUMBER >= 0x00905100 */
124 verify_callback (int ok, X509_STORE_CTX *ctx)
127 s = X509_NAME_oneline (X509_get_subject_name (ctx->current_cert), buf, 256);
129 switch (ctx->error) {
130 case X509_V_ERR_CERT_NOT_YET_VALID:
131 case X509_V_ERR_CERT_HAS_EXPIRED:
132 /* This mean the CERT is not valid !!! */
135 case X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT:
136 /* Unsure if we should handle that this way */
144 /* pass all ssl errors to DEBUGP
145 returns the number of printed errors */
147 ssl_printerrors (void)
150 unsigned long curerr = 0;
152 memset(errbuff, 0, sizeof(errbuff));
153 while ( 0 != (curerr = ERR_get_error ()))
155 DEBUGP (("OpenSSL: %s\n", ERR_error_string (curerr, errbuff)));
161 /* Creates a SSL Context and sets some defaults for it */
163 init_ssl (SSL_CTX **ctx)
165 SSL_METHOD *meth = NULL;
169 SSL_load_error_strings ();
170 SSLeay_add_all_algorithms ();
171 SSLeay_add_ssl_algorithms ();
172 switch (opt.sslprotocol)
175 meth = SSLv23_client_method ();
178 meth = SSLv2_client_method ();
181 meth = SSLv3_client_method ();
184 meth = TLSv1_client_method ();
190 return SSLERRCTXCREATE;
193 *ctx = SSL_CTX_new (meth);
197 return SSLERRCTXCREATE;
199 /* Can we validate the server Cert ? */
200 if (opt.sslcadir != NULL || opt.sslcafile != NULL)
202 SSL_CTX_load_verify_locations (*ctx, opt.sslcafile, opt.sslcadir);
210 if (!opt.sslcheckcert)
212 /* check cert but ignore error, do not break handshake on error */
213 verify = SSL_VERIFY_NONE;
219 logprintf (LOG_NOTQUIET, "Warrining validation of Server Cert not possible!\n");
220 verify = SSL_VERIFY_NONE;
224 /* break handshake if server cert is not valid but allow NO-Cert mode */
225 verify = SSL_VERIFY_PEER;
229 SSL_CTX_set_verify (*ctx, verify, verify_callback);
231 if (opt.sslcertfile != NULL || opt.sslcertkey != NULL)
234 if (!opt.sslcerttype)
235 ssl_cert_type = SSL_FILETYPE_PEM;
237 ssl_cert_type = SSL_FILETYPE_ASN1;
239 if (opt.sslcertkey == NULL)
240 opt.sslcertkey = opt.sslcertfile;
241 if (opt.sslcertfile == NULL)
242 opt.sslcertfile = opt.sslcertkey;
244 if (SSL_CTX_use_certificate_file (*ctx, opt.sslcertfile, ssl_cert_type) <= 0)
247 return SSLERRCERTFILE;
249 if (SSL_CTX_use_PrivateKey_file (*ctx, opt.sslcertkey , ssl_cert_type) <= 0)
252 return SSLERRCERTKEY;
256 return 0; /* Succeded */
260 shutdown_ssl (SSL* con)
264 if (0==SSL_shutdown (con))
269 /* Sets up a SSL structure and performs the handshake on fd
270 Returns 0 if everything went right
271 Returns 1 if something went wrong ----- TODO: More exit codes
274 connect_ssl (SSL **con, SSL_CTX *ctx, int fd)
276 if (NULL == (*con = SSL_new (ctx)))
281 if (!SSL_set_fd (*con, fd))
286 SSL_set_connect_state (*con);
287 switch (SSL_connect (*con))
290 return (*con)->state != SSL_ST_OK;
306 free_ssl_ctx (SSL_CTX * ctx)
311 /* SSL version of iread. Only exchanged read for SSL_read Read at
312 most LEN bytes from FD, storing them to BUF. */
315 ssl_iread (SSL *con, char *buf, int len)
318 BIO_get_fd (con->rbio, &fd);
320 if (opt.read_timeout && !SSL_pending (con))
321 if (select_fd (fd, opt.read_timeout, 0) <= 0)
325 res = SSL_read (con, buf, len);
326 while (res == -1 && errno == EINTR);
331 /* SSL version of iwrite. Only exchanged write for SSL_write Write
332 LEN bytes from BUF to FD. */
335 ssl_iwrite (SSL *con, char *buf, int len)
338 BIO_get_fd (con->rbio, &fd);
339 /* `write' may write less than LEN bytes, thus the outward loop
340 keeps trying it until all was written, or an error occurred. The
341 inner loop is reserved for the usual EINTR f*kage, and the
342 innermost loop deals with the same during select(). */
346 if (opt.read_timeout)
347 if (select_fd (fd, opt.read_timeout, 1) <= 0)
351 res = SSL_write (con, buf, len);
352 while (res == -1 && errno == EINTR);
360 #endif /* HAVE_SSL */