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, most likely because neither
102 /dev/random nor EGD were available. Resort to a simple and
103 stupid method -- seed OpenSSL's PRNG with libc PRNG. This is
104 cryptographically weak, but people who care about strong
105 cryptography should install /dev/random (default on Linux) or
106 specify their own source of randomness anyway. */
108 logprintf (LOG_VERBOSE, _("Warning: using a weak random seed.\n"));
110 while (RAND_status () == 0 && maxrand-- > 0)
112 unsigned char rnd = random_number (256);
113 RAND_seed (&rnd, sizeof (rnd));
115 #endif /* SSLEAY_VERSION_NUMBER >= 0x00905100 */
119 verify_callback (int ok, X509_STORE_CTX *ctx)
122 s = X509_NAME_oneline (X509_get_subject_name (ctx->current_cert), buf, 256);
124 switch (ctx->error) {
125 case X509_V_ERR_CERT_NOT_YET_VALID:
126 case X509_V_ERR_CERT_HAS_EXPIRED:
127 /* This mean the CERT is not valid !!! */
130 case X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT:
131 /* Unsure if we should handle that this way */
139 /* Print SSL errors. */
142 ssl_print_errors (void)
144 unsigned long curerr = 0;
147 while ((curerr = ERR_get_error ()) != 0)
148 logprintf (LOG_NOTQUIET, "OpenSSL: %s\n",
149 ERR_error_string (curerr, errbuff));
152 /* Creates a SSL Context and sets some defaults for it */
156 SSL_METHOD *meth = NULL;
163 /* Init the PRNG. If that fails, bail out. */
165 if (RAND_status () == 0)
167 logprintf (LOG_NOTQUIET,
168 _("Could not seed OpenSSL PRNG; disabling SSL.\n"));
169 scheme_disable (SCHEME_HTTPS);
170 return SSLERRCTXCREATE;
174 SSL_load_error_strings ();
175 SSLeay_add_all_algorithms ();
176 SSLeay_add_ssl_algorithms ();
177 switch (opt.sslprotocol)
180 meth = SSLv23_client_method ();
183 meth = SSLv2_client_method ();
186 meth = SSLv3_client_method ();
189 meth = TLSv1_client_method ();
195 return SSLERRCTXCREATE;
198 ssl_ctx = SSL_CTX_new (meth);
202 return SSLERRCTXCREATE;
204 /* Can we validate the server Cert ? */
205 if (opt.sslcadir != NULL || opt.sslcafile != NULL)
207 SSL_CTX_load_verify_locations (ssl_ctx, opt.sslcafile, opt.sslcadir);
215 if (!opt.sslcheckcert)
217 /* check cert but ignore error, do not break handshake on error */
218 verify = SSL_VERIFY_NONE;
224 logprintf (LOG_NOTQUIET, "Warrining validation of Server Cert not possible!\n");
225 verify = SSL_VERIFY_NONE;
229 /* break handshake if server cert is not valid but allow NO-Cert mode */
230 verify = SSL_VERIFY_PEER;
234 SSL_CTX_set_verify (ssl_ctx, verify, verify_callback);
236 if (opt.sslcertfile != NULL || opt.sslcertkey != NULL)
239 if (!opt.sslcerttype)
240 ssl_cert_type = SSL_FILETYPE_PEM;
242 ssl_cert_type = SSL_FILETYPE_ASN1;
244 if (opt.sslcertkey == NULL)
245 opt.sslcertkey = opt.sslcertfile;
246 if (opt.sslcertfile == NULL)
247 opt.sslcertfile = opt.sslcertkey;
249 if (SSL_CTX_use_certificate_file (ssl_ctx, opt.sslcertfile,
253 return SSLERRCERTFILE;
255 if (SSL_CTX_use_PrivateKey_file (ssl_ctx, opt.sslcertkey,
259 return SSLERRCERTKEY;
263 return 0; /* Succeded */
267 ssl_read (int fd, char *buf, int bufsize, void *ctx)
270 SSL *ssl = (SSL *) ctx;
272 ret = SSL_read (ssl, buf, bufsize);
274 && SSL_get_error (ssl, ret) == SSL_ERROR_SYSCALL
280 ssl_write (int fd, char *buf, int bufsize, void *ctx)
283 SSL *ssl = (SSL *) ctx;
285 ret = SSL_write (ssl, buf, bufsize);
287 && SSL_get_error (ssl, ret) == SSL_ERROR_SYSCALL
293 ssl_poll (int fd, double timeout, int wait_for, void *ctx)
295 SSL *ssl = (SSL *) ctx;
298 if (SSL_pending (ssl))
300 return select_fd (fd, timeout, wait_for);
304 ssl_peek (int fd, char *buf, int bufsize, void *ctx)
307 SSL *ssl = (SSL *) ctx;
309 ret = SSL_peek (ssl, buf, bufsize);
311 && SSL_get_error (ssl, ret) == SSL_ERROR_SYSCALL
317 ssl_close (int fd, void *ctx)
319 SSL *ssl = (SSL *) ctx;
329 DEBUGP (("Closed %d/SSL 0x%0lx\n", fd, (unsigned long) ssl));
332 /* Sets up a SSL structure and performs the handshake on fd. */
339 assert (ssl_ctx != NULL);
340 ssl = SSL_new (ssl_ctx);
343 if (!SSL_set_fd (ssl, fd))
345 SSL_set_connect_state (ssl);
346 if (SSL_connect (ssl) <= 0 || ssl->state != SSL_ST_OK)
349 /* Register FD with Wget's transport layer, i.e. arrange that
350 SSL-enabled functions are used for reading, writing, and polling.
351 That way the rest of Wget can keep using xread, xwrite, and
352 friends and not care what happens underneath. */
353 fd_register_transport (fd, ssl_read, ssl_write, ssl_poll, ssl_peek,
355 DEBUGP (("Connected %d to SSL 0x%0lx\n", fd, (unsigned long) ssl));