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. */
36 #include <openssl/bio.h>
37 #include <openssl/crypto.h>
38 #include <openssl/x509.h>
39 #include <openssl/ssl.h>
40 #include <openssl/err.h>
41 #include <openssl/pem.h>
42 #include <openssl/rand.h>
52 static int verify_callback PARAMS ((int, X509_STORE_CTX *));
57 /* It is likely that older versions of OpenSSL will fail on
58 non-Linux machines because this code is unable to seed the PRNG
59 on older versions of the library. */
61 #if SSLEAY_VERSION_NUMBER >= 0x00905100
65 /* First, seed from a file specified by the user. This will be
66 $RANDFILE, if set, or ~/.rnd. */
67 RAND_file_name (rand_file, sizeof (rand_file));
69 /* Seed at most 16k (value borrowed from curl) from random file. */
70 RAND_load_file (rand_file, 16384);
75 /* Get random data from EGD if opt.sslegdsock was set. */
77 RAND_egd (opt.sslegdsock);
83 /* Under Windows, we can try to seed the PRNG using screen content.
84 This may or may not work, depending on whether we'll calling Wget
92 /* Still not enough randomness, presumably because neither random
93 file nor EGD have been available. Use the stupidest possible
94 method -- seed OpenSSL's PRNG with the system's PRNG. This is
95 insecure in the cryptographic sense, but people who care about
96 security will use /dev/random or their own source of randomness
100 while (RAND_status () == 0 && maxrand-- > 0)
103 RAND_seed ((unsigned char *)&rnd, sizeof (rnd));
106 if (RAND_status () == 0)
108 logprintf (LOG_NOTQUIET, "Could not seed OpenSSL PRNG; disabling SSL.\n");
109 scheme_disable (SCHEME_HTTPS);
111 #endif /* SSLEAY_VERSION_NUMBER >= 0x00905100 */
114 /* Creates a SSL Context and sets some defaults for it */
116 init_ssl (SSL_CTX **ctx)
118 SSL_METHOD *meth = NULL;
119 int verify = SSL_VERIFY_NONE;
121 SSL_load_error_strings ();
122 SSLeay_add_all_algorithms ();
123 SSLeay_add_ssl_algorithms ();
124 meth = SSLv23_client_method ();
125 *ctx = SSL_CTX_new (meth);
126 SSL_CTX_set_verify (*ctx, verify, verify_callback);
127 if (*ctx == NULL) return SSLERRCTXCREATE;
130 if (SSL_CTX_use_certificate_file (*ctx, opt.sslcertfile,
131 SSL_FILETYPE_PEM) <= 0)
132 return SSLERRCERTFILE;
133 if (opt.sslcertkey == NULL)
134 opt.sslcertkey=opt.sslcertfile;
135 if (SSL_CTX_use_PrivateKey_file (*ctx, opt.sslcertkey,
136 SSL_FILETYPE_PEM) <= 0)
137 return SSLERRCERTKEY;
139 return 0; /* Succeded */
142 /* Sets up a SSL structure and performs the handshake on fd
143 Returns 0 if everything went right
144 Returns 1 if something went wrong ----- TODO: More exit codes
147 connect_ssl (SSL **con, SSL_CTX *ctx, int fd)
149 *con = (SSL *)SSL_new (ctx);
150 SSL_set_fd (*con, fd);
151 SSL_set_connect_state (*con);
153 if ((*con)->state != SSL_ST_OK)
155 /*while((SSLerror=ERR_get_error())!=0)
156 printf("%s\n", ERR_error_string(SSLerror,NULL));*/
162 shutdown_ssl (SSL* con)
170 free_ssl_ctx (SSL_CTX * ctx)
176 verify_callback (int ok, X509_STORE_CTX *ctx)
179 s = X509_NAME_oneline (X509_get_subject_name (ctx->current_cert), buf, 256);
181 switch (ctx->error) {
182 case X509_V_ERR_CERT_NOT_YET_VALID:
183 case X509_V_ERR_CERT_HAS_EXPIRED:
184 case X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT:
191 /* pass all ssl errors to DEBUGP
192 returns the number of printed errors */
194 ssl_printerrors (void)
197 unsigned long curerr = 0;
199 memset(errbuff, 0, sizeof(errbuff));
200 for (curerr = ERR_get_error (); curerr; curerr = ERR_get_error ())
202 DEBUGP (("OpenSSL: %s\n", ERR_error_string (curerr, errbuff)));
208 /* SSL version of iread. Only exchanged read for SSL_read
209 Read at most LEN bytes from FD, storing them to BUF. This is
210 virtually the same as read(), but takes care of EINTR braindamage
211 and uses select() to timeout the stale connections (a connection is
212 stale if more than OPT.TIMEOUT time is spent in select() or
215 ssl_iread (SSL *con, char *buf, int len)
219 BIO_get_fd (con->rbio, &fd);
228 res = select_fd (fd, opt.timeout, 0);
230 while (res == -1 && errno == EINTR);
233 /* Set errno to ETIMEDOUT on timeout. */
235 /* #### Potentially evil! */
241 res = SSL_read (con, buf, len);
243 while (res == -1 && errno == EINTR);
248 /* SSL version of iwrite. Only exchanged write for SSL_write
249 Write LEN bytes from BUF to FD. This is similar to iread(), but
250 doesn't bother with select(). Unlike iread(), it makes sure that
251 all of BUF is actually written to FD, so callers needn't bother
252 with checking that the return value equals to LEN. Instead, you
253 should simply check for -1. */
255 ssl_iwrite (SSL *con, char *buf, int len)
259 BIO_get_fd (con->rbio, &fd);
260 /* `write' may write less than LEN bytes, thus the outward loop
261 keeps trying it until all was written, or an error occurred. The
262 inner loop is reserved for the usual EINTR f*kage, and the
263 innermost loop deals with the same during select(). */
273 res = select_fd (fd, opt.timeout, 1);
275 while (res == -1 && errno == EINTR);
278 /* Set errno to ETIMEDOUT on timeout. */
280 /* #### Potentially evil! */
286 res = SSL_write (con, buf, len);
288 while (res == -1 && errno == EINTR);
296 #endif /* HAVE_SSL */