-/* SSL support.
- Copyright (C) 2000 Free Software Foundation, Inc.
- Contributed by Christian Fraenkel.
+/* SSL support via OpenSSL library.
+ Copyright (C) 2000-2005 Free Software Foundation, Inc.
+ Originally contributed by Christian Fraenkel.
This file is part of GNU Wget.
You should have received a copy of the GNU General Public License
along with Wget; if not, write to the Free Software
-Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
+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 <openssl/rand.h>
#include "wget.h"
+#include "utils.h"
#include "connect.h"
#include "url.h"
+#include "gen_sslfunc.h"
#ifndef errno
extern int errno;
#endif
-static int verify_callback PARAMS ((int, X509_STORE_CTX *));
+SSL_CTX *ssl_ctx;
-void
+static void
ssl_init_prng (void)
{
/* It is likely that older versions of OpenSSL will fail on
#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. */
if (RAND_status ())
return;
- /* Get random data from EGD if opt.sslegdsock was set. */
- if (opt.sslegdsock && *opt.sslegdsock)
- RAND_egd (opt.sslegdsock);
+ /* Get random data from EGD if opt.egd_file was set. */
+ if (opt.egd_file && *opt.egd_file)
+ RAND_egd (opt.egd_file);
if (RAND_status ())
return;
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. */
+#if 0 /* don't do this by default */
+ {
+ int maxrand = 500;
+
+ /* Still not random enough, presumably because neither /dev/random
+ nor EGD were available. Try to seed OpenSSL's PRNG with libc
+ PRNG. This is cryptographically weak and defeats the purpose
+ of using OpenSSL, which is why it is highly discouraged. */
+
+ logprintf (LOG_VERBOSE, _("WARNING: using a weak random seed.\n"));
+
+ while (RAND_status () == 0 && maxrand-- > 0)
+ {
+ unsigned char rnd = random_number (256);
+ RAND_seed (&rnd, sizeof (rnd));
+ }
+ }
+#endif
+
+#endif /* SSLEAY_VERSION_NUMBER >= 0x00905100 */
+}
- srand (time (NULL));
- while (RAND_status () == 0 && maxrand-- > 0)
+static 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, sizeof (buf));
+ if (ok == 0)
{
- int rnd = rand ();
- RAND_seed ((unsigned char *)&rnd, sizeof (rnd));
+ 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;
+}
+
+/* Print SSL errors. */
+
+static void
+ssl_print_errors (void)
+{
+ unsigned long curerr = 0;
+ while ((curerr = ERR_get_error ()) != 0)
+ logprintf (LOG_NOTQUIET, "OpenSSL: %s\n", ERR_error_string (curerr, NULL));
+}
+
+/* Creates a SSL Context and sets some defaults for it */
+uerr_t
+ssl_init ()
+{
+ SSL_METHOD *meth = NULL;
+ if (ssl_ctx)
+ return 0;
+
+ /* Init the PRNG. If that fails, bail out. */
+ ssl_init_prng ();
if (RAND_status () == 0)
{
logprintf (LOG_NOTQUIET,
_("Could not seed OpenSSL PRNG; disabling SSL.\n"));
scheme_disable (SCHEME_HTTPS);
+ return SSLERRCTXCREATE;
}
-#endif /* SSLEAY_VERSION_NUMBER >= 0x00905100 */
-}
-/* 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;
SSL_library_init ();
SSL_load_error_strings ();
SSLeay_add_all_algorithms ();
SSLeay_add_ssl_algorithms ();
- meth = SSLv23_client_method ();
- *ctx = SSL_CTX_new (meth);
- SSL_CTX_set_verify (*ctx, verify, verify_callback);
- if (*ctx == NULL) return SSLERRCTXCREATE;
- if (opt.sslcertfile)
+ switch (opt.secure_protocol)
{
- if (SSL_CTX_use_certificate_file (*ctx, opt.sslcertfile,
- SSL_FILETYPE_PEM) <= 0)
- return SSLERRCERTFILE;
- if (opt.sslcertkey == NULL)
- opt.sslcertkey=opt.sslcertfile;
- if (SSL_CTX_use_PrivateKey_file (*ctx, opt.sslcertkey,
- SSL_FILETYPE_PEM) <= 0)
- return SSLERRCERTKEY;
- }
- return 0; /* Succeded */
-}
+ case secure_protocol_auto:
+ meth = SSLv23_client_method ();
+ break;
+ case secure_protocol_sslv2:
+ meth = SSLv2_client_method ();
+ break;
+ case secure_protocol_sslv3:
+ meth = SSLv3_client_method ();
+ break;
+ case secure_protocol_tlsv1:
+ meth = TLSv1_client_method ();
+ break;
+ }
+ if (meth == NULL)
+ {
+ ssl_print_errors ();
+ return SSLERRCTXCREATE;
+ }
-/* 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;
- /*while((SSLerror=ERR_get_error())!=0)
- printf("%s\n", ERR_error_string(SSLerror,NULL));*/
+ ssl_ctx = SSL_CTX_new (meth);
+ if (meth == NULL)
+ {
+ ssl_print_errors ();
+ return SSLERRCTXCREATE;
+ }
- return 0;
+ SSL_CTX_set_default_verify_paths (ssl_ctx);
+ SSL_CTX_load_verify_locations (ssl_ctx, opt.ca_cert, opt.ca_directory);
+ SSL_CTX_set_verify (ssl_ctx,
+ opt.check_cert ? SSL_VERIFY_PEER : SSL_VERIFY_NONE,
+ verify_callback);
+
+ if (opt.cert_file != NULL || opt.cert_key != NULL)
+ {
+ int ssl_cert_type;
+ switch (opt.cert_type)
+ {
+ case cert_type_pem:
+ ssl_cert_type = SSL_FILETYPE_PEM;
+ break;
+ case cert_type_asn1:
+ ssl_cert_type = SSL_FILETYPE_ASN1;
+ break;
+ }
+
+#if 0 /* what was this supposed to achieve? */
+ if (opt.cert_key == NULL)
+ opt.cert_key = opt.cert_file;
+ if (opt.cert_file == NULL)
+ opt.cert_file = opt.cert_key;
+#endif
+
+ if (SSL_CTX_use_certificate_file (ssl_ctx, opt.cert_file,
+ ssl_cert_type) != 1)
+ {
+ ssl_print_errors ();
+ return SSLERRCERTFILE;
+ }
+ if (SSL_CTX_use_PrivateKey_file (ssl_ctx, opt.cert_key,
+ ssl_cert_type) != 1)
+ {
+ ssl_print_errors ();
+ return SSLERRCERTKEY;
+ }
+ }
+
+ return 0; /* Succeded */
}
-void
-shutdown_ssl (SSL* con)
+static int
+ssl_read (int fd, char *buf, int bufsize, void *ctx)
{
- SSL_shutdown (con);
- if (con != NULL)
- SSL_free (con);
+ int ret;
+ SSL *ssl = (SSL *) ctx;
+ do
+ ret = SSL_read (ssl, buf, bufsize);
+ while (ret == -1
+ && SSL_get_error (ssl, ret) == SSL_ERROR_SYSCALL
+ && errno == EINTR);
+ return ret;
}
-void
-free_ssl_ctx (SSL_CTX * ctx)
+static int
+ssl_write (int fd, char *buf, int bufsize, void *ctx)
{
- SSL_CTX_free (ctx);
+ int ret = 0;
+ SSL *ssl = (SSL *) ctx;
+ do
+ ret = SSL_write (ssl, buf, bufsize);
+ while (ret == -1
+ && SSL_get_error (ssl, ret) == SSL_ERROR_SYSCALL
+ && errno == EINTR);
+ return ret;
}
-int
-verify_callback (int ok, X509_STORE_CTX *ctx)
+static int
+ssl_poll (int fd, double timeout, int wait_for, void *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 *ssl = (SSL *) ctx;
+ if (timeout == 0)
+ return 1;
+ if (SSL_pending (ssl))
+ return 1;
+ return select_fd (fd, timeout, wait_for);
}
-/* pass all ssl errors to DEBUGP
- returns the number of printed errors */
-int
-ssl_printerrors (void)
+static int
+ssl_peek (int fd, char *buf, int bufsize, void *ctx)
{
- int ocerr = 0;
- unsigned long curerr = 0;
- char errbuff[1024];
- memset(errbuff, 0, sizeof(errbuff));
- for (curerr = ERR_get_error (); curerr; curerr = ERR_get_error ())
- {
- DEBUGP (("OpenSSL: %s\n", ERR_error_string (curerr, errbuff)));
- ++ocerr;
- }
- return ocerr;
+ int ret;
+ SSL *ssl = (SSL *) ctx;
+ do
+ ret = SSL_peek (ssl, buf, bufsize);
+ while (ret == -1
+ && SSL_get_error (ssl, ret) == SSL_ERROR_SYSCALL
+ && errno == EINTR);
+ return ret;
}
-/* 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)
+static void
+ssl_close (int fd, void *ctx)
{
- int res;
- int 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;
- }
- }
+ SSL *ssl = (SSL *) ctx;
+ SSL_shutdown (ssl);
+ SSL_free (ssl);
+
+#ifdef WINDOWS
+ closesocket (fd);
+#else
+ close (fd);
#endif
- res = SSL_read (con, buf, len);
- }
- while (res == -1 && errno == EINTR);
- return res;
+ DEBUGP (("Closed %d/SSL 0x%0lx\n", fd, (unsigned long) ssl));
}
-/* 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. */
+/* Sets up a SSL structure and performs the handshake on fd. The
+ resulting SSL structure is registered with the file descriptor FD
+ using fd_register_transport. That way subsequent calls to xread,
+ xwrite, etc., will use the appropriate SSL functions.
+
+ Returns 1 on success, 0 on failure. */
+
int
-ssl_iwrite (SSL *con, char *buf, int len)
+ssl_connect (int fd)
{
- int res = 0;
- int 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
- inner loop is reserved for the usual EINTR f*kage, and 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;
- }
- }
-#endif
- res = SSL_write (con, buf, len);
- }
- while (res == -1 && errno == EINTR);
- if (res <= 0)
- break;
- buf += res;
- len -= res;
- }
- return res;
+ SSL *ssl;
+
+ assert (ssl_ctx != NULL);
+ ssl = SSL_new (ssl_ctx);
+ if (!ssl)
+ goto err;
+ if (!SSL_set_fd (ssl, fd))
+ goto err;
+ SSL_set_connect_state (ssl);
+ if (SSL_connect (ssl) <= 0 || ssl->state != SSL_ST_OK)
+ goto err;
+
+ /* Register FD with Wget's transport layer, i.e. arrange that
+ SSL-enabled functions are used for reading, writing, and polling.
+ That way the rest of Wget can keep using xread, xwrite, and
+ friends and not care what happens underneath. */
+ fd_register_transport (fd, ssl_read, ssl_write, ssl_poll, ssl_peek,
+ ssl_close, ssl);
+ DEBUGP (("Connected %d to SSL 0x%0*lx\n", fd, 2 * sizeof (void *),
+ (unsigned long) ssl));
+ return 1;
+
+ err:
+ ssl_print_errors ();
+ if (ssl)
+ SSL_free (ssl);
+ return 0;
}
-#endif /* HAVE_SSL */