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
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
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. */
+ /* Still not enough randomness, most likely because neither
+ /dev/random nor EGD were available. Resort to a simple and
+ stupid method -- seed OpenSSL's PRNG with libc PRNG. This is
+ cryptographically weak, but people who care about strong
+ cryptography should install /dev/random (default on Linux) or
+ specify their own source of randomness anyway. */
+
+ 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 /* SSLEAY_VERSION_NUMBER >= 0x00905100 */
+}
- if (RAND_status () == 0)
- {
- logprintf (LOG_NOTQUIET,
- _("Could not seed OpenSSL PRNG; disabling SSL.\n"));
- scheme_disable (SCHEME_HTTPS);
+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, 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;
}
-#endif /* SSLEAY_VERSION_NUMBER >= 0x00905100 */
+ }
+ return ok;
+}
+
+/* Print SSL errors. */
+
+void
+ssl_print_errors (void)
+{
+ unsigned long curerr = 0;
+ char errbuff[1024];
+ xzero (errbuff);
+ while ((curerr = ERR_get_error ()) != 0)
+ logprintf (LOG_NOTQUIET, "OpenSSL: %s\n",
+ ERR_error_string (curerr, errbuff));
}
/* Creates a SSL Context and sets some defaults for it */
uerr_t
-init_ssl (SSL_CTX **ctx)
+ssl_init ()
{
SSL_METHOD *meth = NULL;
- int verify = SSL_VERIFY_NONE;
+ int verify;
+ int can_validate;
+
+ 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;
+ }
+
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.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_print_errors ();
+ return SSLERRCTXCREATE;
+ }
+
+ ssl_ctx = SSL_CTX_new (meth);
+ if (meth == NULL)
+ {
+ ssl_print_errors ();
+ return SSLERRCTXCREATE;
+ }
+ /* Can we validate the server Cert ? */
+ if (opt.sslcadir != NULL || opt.sslcafile != NULL)
{
- if (SSL_CTX_use_certificate_file (*ctx, opt.sslcertfile,
- SSL_FILETYPE_PEM) <= 0)
- return SSLERRCERTFILE;
+ SSL_CTX_load_verify_locations (ssl_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 (ssl_ctx, verify, verify_callback);
+
+ 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 (SSL_CTX_use_PrivateKey_file (*ctx, opt.sslcertkey,
- SSL_FILETYPE_PEM) <= 0)
- return SSLERRCERTKEY;
- }
+ opt.sslcertkey = opt.sslcertfile;
+ if (opt.sslcertfile == NULL)
+ opt.sslcertfile = opt.sslcertkey;
+
+ if (SSL_CTX_use_certificate_file (ssl_ctx, opt.sslcertfile,
+ ssl_cert_type) <= 0)
+ {
+ ssl_print_errors ();
+ return SSLERRCERTFILE;
+ }
+ if (SSL_CTX_use_PrivateKey_file (ssl_ctx, opt.sslcertkey,
+ ssl_cert_type) <= 0)
+ {
+ ssl_print_errors ();
+ return SSLERRCERTKEY;
+ }
+ }
+
return 0; /* Succeded */
}
-/* 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)
+static int
+ssl_read (int fd, char *buf, int bufsize, void *ctx)
{
- *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));*/
-
- return 0;
+ 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
-shutdown_ssl (SSL* con)
+static int
+ssl_write (int fd, char *buf, int bufsize, void *ctx)
{
- SSL_shutdown (con);
- if (con != NULL)
- SSL_free (con);
+ 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;
}
-void
-free_ssl_ctx (SSL_CTX * ctx)
+static int
+ssl_poll (int fd, double timeout, int wait_for, void *ctx)
{
- SSL_CTX_free (ctx);
+ SSL *ssl = (SSL *) ctx;
+ if (timeout == 0)
+ return 1;
+ if (SSL_pending (ssl))
+ return 1;
+ return select_fd (fd, timeout, wait_for);
}
-int
-verify_callback (int ok, X509_STORE_CTX *ctx)
+static int
+ssl_peek (int fd, char *buf, int bufsize, 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;
+ 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;
}
-/* pass all ssl errors to DEBUGP
- returns the number of printed errors */
-int
-ssl_printerrors (void)
+static void
+ssl_close (int fd, 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;
-}
+ SSL *ssl = (SSL *) ctx;
+ SSL_shutdown (ssl);
+ SSL_free (ssl);
-/* SSL version of iread. Only exchanged read for SSL_read Read at
- most LEN bytes from FD, storing them to BUF. */
-
-int
-ssl_iread (SSL *con, char *buf, int len)
-{
- int res, fd;
- BIO_get_fd (con->rbio, &fd);
-#ifdef HAVE_SELECT
- if (opt.timeout && !SSL_pending (con))
- if (select_fd (fd, opt.timeout, 0) <= 0)
- return -1;
+#ifdef WINDOWS
+ closesocket (fd);
+#else
+ close (fd);
#endif
- do
- 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. */
+/* Sets up a SSL structure and performs the handshake on fd. */
-int
-ssl_iwrite (SSL *con, char *buf, int len)
+SSL *
+ssl_connect (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
- inner loop is reserved for the usual EINTR f*kage, and the
- innermost loop deals with the same during select(). */
- while (len > 0)
- {
-#ifdef HAVE_SELECT
- if (opt.timeout)
- if (select_fd (fd, opt.timeout, 1) <= 0)
- return -1;
-#endif
- do
- 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%0lx\n", fd, (unsigned long) ssl));
+ return ssl;
+
+ err:
+ ssl_print_errors ();
+ if (ssl)
+ SSL_free (ssl);
+ return NULL;
}
-#endif /* HAVE_SSL */
projects / wget / blobdiff