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. */
76 if (opt.sslegdsock && *opt.sslegdsock)
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,
109 _("Could not seed OpenSSL PRNG; disabling SSL.\n"));
110 scheme_disable (SCHEME_HTTPS);
112 #endif /* SSLEAY_VERSION_NUMBER >= 0x00905100 */
115 /* Creates a SSL Context and sets some defaults for it */
117 init_ssl (SSL_CTX **ctx)
119 SSL_METHOD *meth = NULL;
120 int verify = SSL_VERIFY_NONE;
122 SSL_load_error_strings ();
123 SSLeay_add_all_algorithms ();
124 SSLeay_add_ssl_algorithms ();
125 meth = SSLv23_client_method ();
126 *ctx = SSL_CTX_new (meth);
127 SSL_CTX_set_verify (*ctx, verify, verify_callback);
128 if (*ctx == NULL) return SSLERRCTXCREATE;
131 if (SSL_CTX_use_certificate_file (*ctx, opt.sslcertfile,
132 SSL_FILETYPE_PEM) <= 0)
133 return SSLERRCERTFILE;
134 if (opt.sslcertkey == NULL)
135 opt.sslcertkey=opt.sslcertfile;
136 if (SSL_CTX_use_PrivateKey_file (*ctx, opt.sslcertkey,
137 SSL_FILETYPE_PEM) <= 0)
138 return SSLERRCERTKEY;
140 return 0; /* Succeded */
143 /* Sets up a SSL structure and performs the handshake on fd
144 Returns 0 if everything went right
145 Returns 1 if something went wrong ----- TODO: More exit codes
148 connect_ssl (SSL **con, SSL_CTX *ctx, int fd)
150 *con = (SSL *)SSL_new (ctx);
151 SSL_set_fd (*con, fd);
152 SSL_set_connect_state (*con);
154 if ((*con)->state != SSL_ST_OK)
156 /*while((SSLerror=ERR_get_error())!=0)
157 printf("%s\n", ERR_error_string(SSLerror,NULL));*/
163 shutdown_ssl (SSL* con)
171 free_ssl_ctx (SSL_CTX * ctx)
177 verify_callback (int ok, X509_STORE_CTX *ctx)
180 s = X509_NAME_oneline (X509_get_subject_name (ctx->current_cert), buf, 256);
182 switch (ctx->error) {
183 case X509_V_ERR_CERT_NOT_YET_VALID:
184 case X509_V_ERR_CERT_HAS_EXPIRED:
185 case X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT:
192 /* pass all ssl errors to DEBUGP
193 returns the number of printed errors */
195 ssl_printerrors (void)
198 unsigned long curerr = 0;
200 memset(errbuff, 0, sizeof(errbuff));
201 for (curerr = ERR_get_error (); curerr; curerr = ERR_get_error ())
203 DEBUGP (("OpenSSL: %s\n", ERR_error_string (curerr, errbuff)));
209 /* SSL version of iread. Only exchanged read for SSL_read
210 Read at most LEN bytes from FD, storing them to BUF. This is
211 virtually the same as read(), but takes care of EINTR braindamage
212 and uses select() to timeout the stale connections (a connection is
213 stale if more than OPT.TIMEOUT time is spent in select() or
216 ssl_iread (SSL *con, char *buf, int len)
220 BIO_get_fd (con->rbio, &fd);
229 res = select_fd (fd, opt.timeout, 0);
231 while (res == -1 && errno == EINTR);
234 /* Set errno to ETIMEDOUT on timeout. */
236 /* #### Potentially evil! */
242 res = SSL_read (con, buf, len);
244 while (res == -1 && errno == EINTR);
249 /* SSL version of iwrite. Only exchanged write for SSL_write
250 Write LEN bytes from BUF to FD. This is similar to iread(), but
251 doesn't bother with select(). Unlike iread(), it makes sure that
252 all of BUF is actually written to FD, so callers needn't bother
253 with checking that the return value equals to LEN. Instead, you
254 should simply check for -1. */
256 ssl_iwrite (SSL *con, char *buf, int len)
260 BIO_get_fd (con->rbio, &fd);
261 /* `write' may write less than LEN bytes, thus the outward loop
262 keeps trying it until all was written, or an error occurred. The
263 inner loop is reserved for the usual EINTR f*kage, and the
264 innermost loop deals with the same during select(). */
274 res = select_fd (fd, opt.timeout, 1);
276 while (res == -1 && errno == EINTR);
279 /* Set errno to ETIMEDOUT on timeout. */
281 /* #### Potentially evil! */
287 res = SSL_write (con, buf, len);
289 while (res == -1 && errno == EINTR);
297 #endif /* HAVE_SSL */