add initial support for RFC 4279 PSK SSL ciphersuites
PR: 1191
Submitted by: Mika Kousa and Pasi Eronen of Nokia Corporation
Reviewed by: Nils Larsch
diff --git a/apps/s_client.c b/apps/s_client.c
index 50e27a0..138aa31 100644
--- a/apps/s_client.c
+++ b/apps/s_client.c
@@ -108,8 +108,35 @@
* Hudson (tjh@cryptsoft.com).
*
*/
+/* ====================================================================
+ * Copyright 2005 Nokia. All rights reserved.
+ *
+ * The portions of the attached software ("Contribution") is developed by
+ * Nokia Corporation and is licensed pursuant to the OpenSSL open source
+ * license.
+ *
+ * The Contribution, originally written by Mika Kousa and Pasi Eronen of
+ * Nokia Corporation, consists of the "PSK" (Pre-Shared Key) ciphersuites
+ * support (see RFC 4279) to OpenSSL.
+ *
+ * No patent licenses or other rights except those expressly stated in
+ * the OpenSSL open source license shall be deemed granted or received
+ * expressly, by implication, estoppel, or otherwise.
+ *
+ * No assurances are provided by Nokia that the Contribution does not
+ * infringe the patent or other intellectual property rights of any third
+ * party or that the license provides you with all the necessary rights
+ * to make use of the Contribution.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. IN
+ * ADDITION TO THE DISCLAIMERS INCLUDED IN THE LICENSE, NOKIA
+ * SPECIFICALLY DISCLAIMS ANY LIABILITY FOR CLAIMS BROUGHT BY YOU OR ANY
+ * OTHER ENTITY BASED ON INFRINGEMENT OF INTELLECTUAL PROPERTY RIGHTS OR
+ * OTHERWISE.
+ */
#include <assert.h>
+#include <ctype.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
@@ -171,6 +198,69 @@
static int c_quiet=0;
static int c_ign_eof=0;
+#ifndef OPENSSL_NO_PSK
+/* Default PSK identity and key */
+static char *psk_identity="Client_identity";
+static char *psk_key=NULL; /* by default PSK is not used */
+
+static unsigned int psk_client_cb(SSL *ssl, const char *hint, char *identity,
+ unsigned int max_identity_len, unsigned char *psk,
+ unsigned int max_psk_len)
+ {
+ unsigned int psk_len = 0;
+ int ret;
+ BIGNUM *bn=NULL;
+
+ if (c_debug)
+ BIO_printf(bio_c_out, "psk_client_cb\n");
+ if (!hint)
+ {
+ /* no ServerKeyExchange message*/
+ if (c_debug)
+ BIO_printf(bio_c_out,"NULL received PSK identity hint, continuing anyway\n");
+ }
+ else if (c_debug)
+ BIO_printf(bio_c_out, "Received PSK identity hint '%s'\n", hint);
+
+ /* lookup PSK identity and PSK key based on the given identity hint here */
+ ret = snprintf(identity, max_identity_len, psk_identity);
+ if (ret < 0 || ret > max_identity_len)
+ goto out_err;
+ if (c_debug)
+ BIO_printf(bio_c_out, "created identity '%s' len=%d\n", identity, ret);
+ ret=BN_hex2bn(&bn, psk_key);
+ if (!ret)
+ {
+ BIO_printf(bio_err,"Could not convert PSK key '%s' to BIGNUM\n", psk_key);
+ if (bn)
+ BN_free(bn);
+ return 0;
+ }
+
+ if (BN_num_bytes(bn) > max_psk_len)
+ {
+ BIO_printf(bio_err,"psk buffer of callback is too small (%d) for key (%d)\n",
+ max_psk_len, BN_num_bytes(bn));
+ BN_free(bn);
+ return 0;
+ }
+
+ psk_len=BN_bn2bin(bn, psk);
+ BN_free(bn);
+ if (psk_len == 0)
+ goto out_err;
+
+ if (c_debug)
+ BIO_printf(bio_c_out, "created PSK len=%d\n", psk_len);
+
+ return psk_len;
+ out_err:
+ if (c_debug)
+ BIO_printf(bio_err, "Error in PSK client callback\n");
+ return 0;
+ }
+#endif
+
static void sc_usage(void)
{
BIO_printf(bio_err,"usage: s_client args\n");
@@ -204,6 +294,10 @@
BIO_printf(bio_err," -crlf - convert LF from terminal into CRLF\n");
BIO_printf(bio_err," -quiet - no s_client output\n");
BIO_printf(bio_err," -ign_eof - ignore input eof (default when -quiet)\n");
+#ifndef OPENSSL_NO_PSK
+ BIO_printf(bio_err," -psk_identity arg - PSK identity\n");
+ BIO_printf(bio_err," -psk arg - PSK in hex (without 0x)\n");
+#endif
BIO_printf(bio_err," -ssl2 - just use SSLv2\n");
BIO_printf(bio_err," -ssl3 - just use SSLv3\n");
BIO_printf(bio_err," -tls1 - just use TLSv1\n");
@@ -404,6 +498,27 @@
nbio_test=1;
else if (strcmp(*argv,"-state") == 0)
state=1;
+#ifndef OPENSSL_NO_PSK
+ else if (strcmp(*argv,"-psk_identity") == 0)
+ {
+ if (--argc < 1) goto bad;
+ psk_identity=*(++argv);
+ }
+ else if (strcmp(*argv,"-psk") == 0)
+ {
+ size_t j;
+
+ if (--argc < 1) goto bad;
+ psk_key=*(++argv);
+ for (j = 0; j < strlen(psk_key); j++)
+ {
+ if (isxdigit((int)psk_key[j]))
+ continue;
+ BIO_printf(bio_err,"Not a hex number '%s'\n",*argv);
+ goto bad;
+ }
+ }
+#endif
#ifndef OPENSSL_NO_SSL2
else if (strcmp(*argv,"-ssl2") == 0)
meth=SSLv2_client_method();
@@ -599,6 +714,14 @@
goto end;
}
+#ifndef OPENSSL_NO_PSK
+ if (psk_key != NULL)
+ {
+ if (c_debug)
+ BIO_printf(bio_c_out, "PSK key given, setting client callback\n");
+ SSL_CTX_set_psk_client_callback(ctx, psk_client_cb);
+ }
+#endif
if (bugs)
SSL_CTX_set_options(ctx,SSL_OP_ALL|off);
else
