/* SSL support.
- Copyright (C) 2000 Christian Fraenkel.
+ Copyright (C) 2000 Free Software Foundation, Inc.
+ Contributed by Christian Fraenkel.
-This file is part of Wget.
+This file is part of GNU Wget.
-This program is free software; you can redistribute it and/or modify
+GNU Wget is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
-This program is distributed in the hope that it will be useful,
+GNU Wget is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
-along with this program; if not, write to the Free Software
-Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
+along with Wget; if not, write to the Free Software
+Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+
+In addition, as a special exception, the Free Software Foundation
+gives permission to link the code of its release of Wget with the
+OpenSSL project's "OpenSSL" library (or with modified versions of it
+that use the same license as the "OpenSSL" library), and distribute
+the linked executables. You must obey the GNU General Public License
+in all respects for all of the code used other than "OpenSSL". If you
+modify this file, you may extend this exception to your version of the
+file, but you are not obligated to do so. If you do not wish to do
+so, delete this exception statement from your version. */
#include <config.h>
+
#ifdef HAVE_SSL
+
+#include <assert.h>
+#include <errno.h>
+#ifdef HAVE_UNISTD_H
+# include <unistd.h>
+#endif
+#ifdef HAVE_STRING_H
+# include <string.h>
+#else
+# include <strings.h>
+#endif
+
#include <openssl/bio.h>
#include <openssl/crypto.h>
#include <openssl/x509.h>
#include <openssl/ssl.h>
#include <openssl/err.h>
#include <openssl/pem.h>
-#include <assert.h>
-#define SSL_ERR_CTX_CREATION -2
-#include <sys/time.h>
+#include <openssl/rand.h>
+
#include "wget.h"
+#include "utils.h"
#include "connect.h"
+#include "url.h"
-/* #### Shouldn't this be static? --hniksic */
-int verify_callback PARAMS ((int, X509_STORE_CTX *));
+#ifndef errno
+extern int errno;
+#endif
+
+void
+ssl_init_prng (void)
+{
+ /* It is likely that older versions of OpenSSL will fail on
+ non-Linux machines because this code is unable to seed the PRNG
+ on older versions of the library. */
+
+#if SSLEAY_VERSION_NUMBER >= 0x00905100
+ char rand_file[256];
+ int maxrand = 500;
+
+ /* First, seed from a file specified by the user. This will be
+ $RANDFILE, if set, or ~/.rnd. */
+ RAND_file_name (rand_file, sizeof (rand_file));
+ if (rand_file)
+ /* Seed at most 16k (value borrowed from curl) from random file. */
+ RAND_load_file (rand_file, 16384);
+
+ if (RAND_status ())
+ return;
+
+ /* Get random data from EGD if opt.sslegdsock was set. */
+ if (opt.sslegdsock && *opt.sslegdsock)
+ RAND_egd (opt.sslegdsock);
+
+ if (RAND_status ())
+ return;
+
+#ifdef WINDOWS
+ /* Under Windows, we can try to seed the PRNG using screen content.
+ This may or may not work, depending on whether we'll calling Wget
+ interactively. */
+
+ RAND_screen ();
+ if (RAND_status ())
+ return;
+#endif
+
+ /* Still not enough randomness, presumably because neither random
+ file nor EGD have been available. Use the stupidest possible
+ method -- seed OpenSSL's PRNG with the system's PRNG. This is
+ insecure in the cryptographic sense, but people who care about
+ security will use /dev/random or their own source of randomness
+ anyway. */
+
+ while (RAND_status () == 0 && maxrand-- > 0)
+ {
+ unsigned char rnd = random_number (256);
+ RAND_seed (&rnd, sizeof (rnd));
+ }
+
+ if (RAND_status () == 0)
+ {
+ logprintf (LOG_NOTQUIET,
+ _("Could not seed OpenSSL PRNG; disabling SSL.\n"));
+ scheme_disable (SCHEME_HTTPS);
+ }
+#endif /* SSLEAY_VERSION_NUMBER >= 0x00905100 */
+}
-/* Creates a SSL Context and sets some defaults for it */
int
+verify_callback (int ok, X509_STORE_CTX *ctx)
+{
+ char *s, buf[256];
+ s = X509_NAME_oneline (X509_get_subject_name (ctx->current_cert), buf, 256);
+ if (ok == 0) {
+ switch (ctx->error) {
+ case X509_V_ERR_CERT_NOT_YET_VALID:
+ case X509_V_ERR_CERT_HAS_EXPIRED:
+ /* This mean the CERT is not valid !!! */
+ ok = 0;
+ break;
+ case X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT:
+ /* Unsure if we should handle that this way */
+ ok = 1;
+ break;
+ }
+ }
+ return ok;
+}
+
+/* pass all ssl errors to DEBUGP
+ returns the number of printed errors */
+int
+ssl_printerrors (void)
+{
+ int ocerr = 0;
+ unsigned long curerr = 0;
+ char errbuff[1024];
+ xzero (errbuff);
+ while ((curerr = ERR_get_error ()) != 0)
+ {
+ DEBUGP (("OpenSSL: %s\n", ERR_error_string (curerr, errbuff)));
+ ++ocerr;
+ }
+ return ocerr;
+}
+
+/* Creates a SSL Context and sets some defaults for it */
+uerr_t
init_ssl (SSL_CTX **ctx)
{
SSL_METHOD *meth = NULL;
- int verify = SSL_VERIFY_NONE;
+ int verify;
+ int can_validate;
SSL_library_init ();
SSL_load_error_strings ();
SSLeay_add_all_algorithms ();
SSLeay_add_ssl_algorithms ();
- meth = SSLv23_client_method ();
+ switch (opt.sslprotocol)
+ {
+ default:
+ meth = SSLv23_client_method ();
+ break;
+ case 1 :
+ meth = SSLv2_client_method ();
+ break;
+ case 2 :
+ meth = SSLv3_client_method ();
+ break;
+ case 3 :
+ meth = TLSv1_client_method ();
+ break;
+ }
+ if (meth == NULL)
+ {
+ ssl_printerrors ();
+ return SSLERRCTXCREATE;
+ }
+
*ctx = SSL_CTX_new (meth);
+ if (meth == NULL)
+ {
+ ssl_printerrors ();
+ return SSLERRCTXCREATE;
+ }
+ /* Can we validate the server Cert ? */
+ if (opt.sslcadir != NULL || opt.sslcafile != NULL)
+ {
+ SSL_CTX_load_verify_locations (*ctx, opt.sslcafile, opt.sslcadir);
+ can_validate = 1;
+ }
+ else
+ {
+ can_validate = 0;
+ }
+
+ if (!opt.sslcheckcert)
+ {
+ /* check cert but ignore error, do not break handshake on error */
+ verify = SSL_VERIFY_NONE;
+ }
+ else
+ {
+ if (!can_validate)
+ {
+ logprintf (LOG_NOTQUIET, "Warrining validation of Server Cert not possible!\n");
+ verify = SSL_VERIFY_NONE;
+ }
+ else
+ {
+ /* break handshake if server cert is not valid but allow NO-Cert mode */
+ verify = SSL_VERIFY_PEER;
+ }
+ }
+
SSL_CTX_set_verify (*ctx, verify, verify_callback);
- if (*ctx == NULL) return SSL_ERR_CTX_CREATION;
+
+ if (opt.sslcertfile != NULL || opt.sslcertkey != NULL)
+ {
+ int ssl_cert_type;
+ if (!opt.sslcerttype)
+ ssl_cert_type = SSL_FILETYPE_PEM;
+ else
+ ssl_cert_type = SSL_FILETYPE_ASN1;
+
+ if (opt.sslcertkey == NULL)
+ opt.sslcertkey = opt.sslcertfile;
+ if (opt.sslcertfile == NULL)
+ opt.sslcertfile = opt.sslcertkey;
+
+ if (SSL_CTX_use_certificate_file (*ctx, opt.sslcertfile, ssl_cert_type) <= 0)
+ {
+ ssl_printerrors ();
+ return SSLERRCERTFILE;
+ }
+ if (SSL_CTX_use_PrivateKey_file (*ctx, opt.sslcertkey , ssl_cert_type) <= 0)
+ {
+ ssl_printerrors ();
+ return SSLERRCERTKEY;
+ }
+ }
+
return 0; /* Succeded */
}
+void
+shutdown_ssl (SSL* con)
+{
+ if (con == NULL)
+ return;
+ if (0==SSL_shutdown (con))
+ SSL_shutdown (con);
+ SSL_free (con);
+}
+
/* Sets up a SSL structure and performs the handshake on fd
Returns 0 if everything went right
Returns 1 if something went wrong ----- TODO: More exit codes
int
connect_ssl (SSL **con, SSL_CTX *ctx, int fd)
{
- *con = (SSL *)SSL_new (ctx);
- SSL_set_fd (*con, fd);
- SSL_set_connect_state (*con);
- SSL_connect (*con);
- if ((*con)->state != SSL_ST_OK)
- return 1;
+ if (NULL == (*con = SSL_new (ctx)))
+ {
+ ssl_printerrors ();
+ return 1;
+ }
+ if (!SSL_set_fd (*con, fd))
+ {
+ ssl_printerrors ();
+ return 1;
+ }
+ SSL_set_connect_state (*con);
+ switch (SSL_connect (*con))
+ {
+ case 1 :
+ return (*con)->state != SSL_ST_OK;
+ default:
+ ssl_printerrors ();
+ shutdown_ssl (*con);
+ *con = NULL;
+ return 1;
+ case 0 :
+ ssl_printerrors ();
+ SSL_free (*con);
+ *con = NULL;
+ return 1;
+ }
return 0;
}
-void
-shutdown_ssl (SSL* con)
-{
- SSL_shutdown (con);
- if (con != NULL)
- SSL_free (con);
-}
-
void
free_ssl_ctx (SSL_CTX * ctx)
{
SSL_CTX_free (ctx);
}
-int
-verify_callback (int ok, X509_STORE_CTX *ctx)
-{
- char *s, buf[256];
- s = X509_NAME_oneline (X509_get_subject_name (ctx->current_cert), buf, 256);
- if (ok == 0) {
- switch (ctx->error) {
- case X509_V_ERR_CERT_NOT_YET_VALID:
- case X509_V_ERR_CERT_HAS_EXPIRED:
- case X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT:
- ok = 1;
- }
- }
- return ok;
-}
+/* SSL version of iread. Only exchanged read for SSL_read Read at
+ most LEN bytes from FD, storing them to BUF. */
-/* SSL version of iread. Only exchanged read for SSL_read
- Read at most LEN bytes from FD, storing them to BUF. This is
- virtually the same as read(), but takes care of EINTR braindamage
- and uses select() to timeout the stale connections (a connection is
- stale if more than OPT.TIMEOUT time is spent in select() or
- read()). */
int
ssl_iread (SSL *con, char *buf, int len)
{
- int res;
- int fd;
+ int res, fd;
BIO_get_fd (con->rbio, &fd);
- do
- {
#ifdef HAVE_SELECT
- if (opt.timeout)
- {
-
- do
- {
- res = select_fd (fd, opt.timeout, 0);
- }
- while (res == -1 && errno == EINTR);
- if (res <= 0)
- {
- /* Set errno to ETIMEDOUT on timeout. */
- if (res == 0)
- /* #### Potentially evil! */
- errno = ETIMEDOUT;
- return -1;
- }
- }
+ if (opt.read_timeout && !SSL_pending (con))
+ if (select_fd (fd, opt.read_timeout, 0) <= 0)
+ return -1;
#endif
- res = SSL_read (con, buf, len);
- }
+ do
+ res = SSL_read (con, buf, len);
while (res == -1 && errno == EINTR);
return res;
}
-/* SSL version of iwrite. Only exchanged write for SSL_write
- Write LEN bytes from BUF to FD. This is similar to iread(), but
- doesn't bother with select(). Unlike iread(), it makes sure that
- all of BUF is actually written to FD, so callers needn't bother
- with checking that the return value equals to LEN. Instead, you
- should simply check for -1. */
+/* SSL version of iwrite. Only exchanged write for SSL_write Write
+ LEN bytes from BUF to FD. */
+
int
ssl_iwrite (SSL *con, char *buf, int len)
{
- int res = 0;
- int fd;
+ int res = 0, fd;
BIO_get_fd (con->rbio, &fd);
/* `write' may write less than LEN bytes, thus the outward loop
keeps trying it until all was written, or an error occurred. The
innermost loop deals with the same during select(). */
while (len > 0)
{
- do
- {
#ifdef HAVE_SELECT
- if (opt.timeout)
- {
- do
- {
- res = select_fd (fd, opt.timeout, 1);
- }
- while (res == -1 && errno == EINTR);
- if (res <= 0)
- {
- /* Set errno to ETIMEDOUT on timeout. */
- if (res == 0)
- /* #### Potentially evil! */
- errno = ETIMEDOUT;
- return -1;
- }
- }
+ if (opt.read_timeout)
+ if (select_fd (fd, opt.read_timeout, 1) <= 0)
+ return -1;
#endif
- res = SSL_write (con, buf, len);
- }
+ do
+ res = SSL_write (con, buf, len);
while (res == -1 && errno == EINTR);
if (res <= 0)
break;
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