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_server.c b/apps/s_server.c
index 583bfcc..aeec035 100644
--- a/apps/s_server.c
+++ b/apps/s_server.c
@@ -113,6 +113,32 @@
* ECC cipher suite support in OpenSSL originally developed by
* SUN MICROSYSTEMS, INC., and contributed to the OpenSSL project.
*/
+/* ====================================================================
+ * 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.
+ */
/* Until the key-gen callbacks are modified to use newer prototypes, we allow
* deprecated functions for openssl-internal code */
@@ -121,6 +147,7 @@
#endif
#include <assert.h>
+#include <ctype.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
@@ -263,6 +290,70 @@
static long socket_mtu;
static int cert_chain = 0;
+#ifndef OPENSSL_NO_PSK
+static char *psk_identity="Client_identity";
+static char *psk_key=NULL; /* by default PSK is not used */
+
+static unsigned int psk_server_cb(SSL *ssl, const char *identity,
+ unsigned char *psk, unsigned int max_psk_len)
+ {
+ unsigned int psk_len = 0;
+ int ret;
+ BIGNUM *bn = NULL;
+
+ if (s_debug)
+ BIO_printf(bio_s_out,"psk_server_cb\n");
+ if (!identity)
+ {
+ BIO_printf(bio_err,"Error: client did not send PSK identity\n");
+ goto out_err;
+ }
+ if (s_debug)
+ BIO_printf(bio_s_out,"identity_len=%d identity=%s\n",
+ identity ? strlen(identity) : 0, identity);
+
+ /* here we could lookup the given identity e.g. from a database */
+ if (strcmp(identity, psk_identity) != 0)
+ {
+ BIO_printf(bio_s_out, "PSK error: client identity not found\n");
+ goto out_err;
+ }
+ if (s_debug)
+ BIO_printf(bio_s_out, "PSK client identity found\n");
+
+ /* convert the PSK key to binary */
+ 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) > (int)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;
+ }
+
+ ret = BN_bn2bin(bn, psk);
+ BN_free(bn);
+
+ if (ret < 0)
+ goto out_err;
+ psk_len = (unsigned int)ret;
+
+ if (s_debug)
+ BIO_printf(bio_s_out, "fetched PSK len=%d\n", psk_len);
+ return psk_len;
+ out_err:
+ if (s_debug)
+ BIO_printf(bio_err, "Error in PSK server callback\n");
+ return 0;
+ }
+#endif
#ifdef MONOLITH
static void s_server_init(void)
@@ -339,6 +430,10 @@
BIO_printf(bio_err," -serverpref - Use server's cipher preferences\n");
BIO_printf(bio_err," -quiet - No server output\n");
BIO_printf(bio_err," -no_tmp_rsa - Do not generate a tmp RSA key\n");
+#ifndef OPENSSL_NO_PSK
+ BIO_printf(bio_err," -psk_hint arg - PSK identity hint to use\n");
+ BIO_printf(bio_err," -psk arg - PSK in hex (without 0x)\n");
+#endif
BIO_printf(bio_err," -ssl2 - Just talk SSLv2\n");
BIO_printf(bio_err," -ssl3 - Just talk SSLv3\n");
BIO_printf(bio_err," -tls1 - Just talk TLSv1\n");
@@ -600,6 +695,10 @@
#ifndef OPENSSL_NO_TLSEXT
tlsextctx tlsextcbp = {NULL, NULL, SSL_TLSEXT_ERR_ALERT_WARNING};
#endif
+#ifndef OPENSSL_NO_PSK
+ /* by default do not send a PSK identity hint */
+ static char *psk_identity_hint=NULL;
+#endif
#if !defined(OPENSSL_NO_SSL2) && !defined(OPENSSL_NO_SSL3)
meth=SSLv23_server_method();
#elif !defined(OPENSSL_NO_SSL3)
@@ -782,6 +881,27 @@
{ no_dhe=1; }
else if (strcmp(*argv,"-no_ecdhe") == 0)
{ no_ecdhe=1; }
+#ifndef OPENSSL_NO_PSK
+ else if (strcmp(*argv,"-psk_hint") == 0)
+ {
+ if (--argc < 1) goto bad;
+ psk_identity_hint= *(++argv);
+ }
+ else if (strcmp(*argv,"-psk") == 0)
+ {
+ int i;
+
+ if (--argc < 1) goto bad;
+ psk_key=*(++argv);
+ for (i=0; i<strlen(psk_key); i++)
+ {
+ if (isxdigit((int)psk_key[i]))
+ continue;
+ BIO_printf(bio_err,"Not a hex number '%s'\n",*argv);
+ goto bad;
+ }
+ }
+#endif
else if (strcmp(*argv,"-www") == 0)
{ www=1; }
else if (strcmp(*argv,"-WWW") == 0)
@@ -1259,6 +1379,22 @@
#endif
#endif
+#ifndef OPENSSL_NO_PSK
+ if (psk_key != NULL)
+ {
+ if (s_debug)
+ BIO_printf(bio_s_out, "PSK key given, setting server callback\n");
+ SSL_CTX_set_psk_server_callback(ctx, psk_server_cb);
+ }
+
+ if (!SSL_CTX_use_psk_identity_hint(ctx, psk_identity_hint))
+ {
+ BIO_printf(bio_err,"error setting PSK identity hint to context\n");
+ ERR_print_errors(bio_err);
+ goto end;
+ }
+#endif
+
if (cipher != NULL)
{
if(!SSL_CTX_set_cipher_list(ctx,cipher))
