int
print_info (gnutls_session_t session, int print_cert)
{
const char *tmp;
gnutls_credentials_type_t cred;
gnutls_kx_algorithm_t kx;
unsigned char session_id[33];
size_t session_id_size = sizeof (session_id);
/* print session ID */
gnutls_session_get_id (session, session_id, &session_id_size);
printf ("- Session ID: %s\n",
raw_to_string (session_id, session_id_size));
/* print the key exchange's algorithm name
*/
kx = gnutls_kx_get (session);
cred = gnutls_auth_get_type (session);
switch (cred)
{
#ifdef ENABLE_ANON
case GNUTLS_CRD_ANON:
if (kx == GNUTLS_KX_ANON_ECDH)
print_ecdh_info (session, "Anonymous ");
else
print_dh_info (session, "Anonymous ", verbose);
break;
#endif
#ifdef ENABLE_SRP
case GNUTLS_CRD_SRP:
/* This should be only called in server
* side.
*/
if (gnutls_srp_server_get_username (session) != NULL)
printf ("- SRP authentication. Connected as '%s'\n",
gnutls_srp_server_get_username (session));
break;
#endif
#ifdef ENABLE_PSK
case GNUTLS_CRD_PSK:
/* This returns NULL in server side.
*/
if (gnutls_psk_client_get_hint (session) != NULL)
printf ("- PSK authentication. PSK hint '%s'\n",
gnutls_psk_client_get_hint (session));
/* This returns NULL in client side.
*/
if (gnutls_psk_server_get_username (session) != NULL)
printf ("- PSK authentication. Connected as '%s'\n",
gnutls_psk_server_get_username (session));
if (kx == GNUTLS_KX_DHE_PSK)
print_dh_info (session, "Ephemeral ", verbose);
if (kx == GNUTLS_KX_ECDHE_PSK)
print_ecdh_info (session, "Ephemeral ");
break;
#endif
case GNUTLS_CRD_IA:
printf ("- TLS/IA authentication\n");
break;
case GNUTLS_CRD_CERTIFICATE:
{
char dns[256];
size_t dns_size = sizeof (dns);
unsigned int type;
/* This fails in client side */
if (gnutls_server_name_get
(session, dns, &dns_size, &type, 0) == 0)
{
printf ("- Given server name[%d]: %s\n", type, dns);
}
}
print_cert_info (session,
verbose?GNUTLS_CRT_PRINT_FULL:GNUTLS_CRT_PRINT_COMPACT,
print_cert);
if (kx == GNUTLS_KX_DHE_RSA || kx == GNUTLS_KX_DHE_DSS)
print_dh_info (session, "Ephemeral ", verbose);
else if (kx == GNUTLS_KX_ECDHE_RSA
|| kx == GNUTLS_KX_ECDHE_ECDSA)
print_ecdh_info (session, "Ephemeral ");
}
tmp =
SU (gnutls_protocol_get_name
(gnutls_protocol_get_version (session)));
printf ("- Version: %s\n", tmp);
tmp = SU (gnutls_kx_get_name (kx));
printf ("- Key Exchange: %s\n", tmp);
tmp = SU (gnutls_cipher_get_name (gnutls_cipher_get (session)));
printf ("- Cipher: %s\n", tmp);
tmp = SU (gnutls_mac_get_name (gnutls_mac_get (session)));
printf ("- MAC: %s\n", tmp);
tmp =
SU (gnutls_compression_get_name
(gnutls_compression_get (session)));
printf ("- Compression: %s\n", tmp);
if (verbose)
{
gnutls_datum_t cb;
int rc;
rc = gnutls_session_channel_binding (session,
GNUTLS_CB_TLS_UNIQUE, &cb);
if (rc)
fprintf (stderr, "Channel binding error: %s\n",
gnutls_strerror (rc));
else
{
size_t i;
printf ("- Channel binding 'tls-unique': ");
for (i = 0; i < cb.size; i++)
printf ("%02x", cb.data[i]);
printf ("\n");
}
}
/* Warning: Do not print anything more here. The 'Compression:'
output MUST be the last non-verbose output. This is used by
Emacs starttls.el code. */
fflush (stdout);
return 0;
}
static int
psk_callback (gnutls_session_t session, char **username, gnutls_datum_t * key)
{
const char *hint = gnutls_psk_client_get_hint (session);
char *passwd;
int ret;
printf ("- PSK client callback. ");
if (hint)
printf ("PSK hint '%s'\n", hint);
else
printf ("No PSK hint\n");
if (info.psk_username)
*username = gnutls_strdup (info.psk_username);
else
{
char *tmp = NULL;
size_t n;
ssize_t len;
printf ("Enter PSK identity: ");
fflush (stdout);
len = getline (&tmp, &n, stdin);
if (tmp == NULL)
{
fprintf (stderr, "No username given, aborting...\n");
return GNUTLS_E_INSUFFICIENT_CREDENTIALS;
}
if (tmp[strlen (tmp) - 1] == '\n')
tmp[strlen (tmp) - 1] = '\0';
if (tmp[strlen (tmp) - 1] == '\r')
tmp[strlen (tmp) - 1] = '\0';
*username = gnutls_strdup (tmp);
free (tmp);
}
if (!*username)
return GNUTLS_E_MEMORY_ERROR;
passwd = getpass ("Enter password: "******"No password given, aborting...\n");
return GNUTLS_E_INSUFFICIENT_CREDENTIALS;
}
ret = gnutls_psk_netconf_derive_key (passwd,
*username, hint ? hint : "", key);
if (ret < 0)
{
fprintf (stderr, "Error deriving password: %s\n",
gnutls_strerror (ret));
gnutls_free (*username);
return ret;
}
if (info.debug)
{
char hexkey[41];
size_t res_size = sizeof (hexkey);
gnutls_hex_encode (key, hexkey, &res_size);
fprintf (stderr, "PSK username: %s\n", *username);
fprintf (stderr, "PSK hint: %s\n", hint);
fprintf (stderr, "PSK key: %s\n", hexkey);
}
return 0;
}
/* This function will print some details of the
* given session.
*/
int
print_info (gnutls_session_t session)
{
const char *tmp;
gnutls_credentials_type_t cred;
gnutls_kx_algorithm_t kx;
/* print the key exchange's algorithm name
*/
kx = gnutls_kx_get (session);
tmp = gnutls_kx_get_name (kx);
printf ("- Key Exchange: %s\n", tmp);
/* Check the authentication type used and switch
* to the appropriate.
*/
cred = gnutls_auth_get_type (session);
switch (cred)
{
case GNUTLS_CRD_IA:
printf ("- TLS/IA session\n");
break;
#ifdef ENABLE_SRP
case GNUTLS_CRD_SRP:
printf ("- SRP session with username %s\n",
gnutls_srp_server_get_username (session));
break;
#endif
case GNUTLS_CRD_PSK:
/* This returns NULL in server side.
*/
if (gnutls_psk_client_get_hint (session) != NULL)
printf ("- PSK authentication. PSK hint '%s'\n",
gnutls_psk_client_get_hint (session));
/* This returns NULL in client side.
*/
if (gnutls_psk_server_get_username (session) != NULL)
printf ("- PSK authentication. Connected as '%s'\n",
gnutls_psk_server_get_username (session));
break;
case GNUTLS_CRD_ANON: /* anonymous authentication */
printf ("- Anonymous DH using prime of %d bits\n",
gnutls_dh_get_prime_bits (session));
break;
case GNUTLS_CRD_CERTIFICATE: /* certificate authentication */
/* Check if we have been using ephemeral Diffie-Hellman.
*/
if (kx == GNUTLS_KX_DHE_RSA || kx == GNUTLS_KX_DHE_DSS)
{
printf ("\n- Ephemeral DH using prime of %d bits\n",
gnutls_dh_get_prime_bits (session));
}
/* if the certificate list is available, then
* print some information about it.
*/
print_x509_certificate_info (session);
} /* switch */
/* print the protocol's name (ie TLS 1.0)
*/
tmp = gnutls_protocol_get_name (gnutls_protocol_get_version (session));
printf ("- Protocol: %s\n", tmp);
/* print the certificate type of the peer.
* ie X.509
*/
tmp =
gnutls_certificate_type_get_name (gnutls_certificate_type_get (session));
printf ("- Certificate Type: %s\n", tmp);
/* print the compression algorithm (if any)
*/
tmp = gnutls_compression_get_name (gnutls_compression_get (session));
printf ("- Compression: %s\n", tmp);
/* print the name of the cipher used.
* ie 3DES.
*/
tmp = gnutls_cipher_get_name (gnutls_cipher_get (session));
printf ("- Cipher: %s\n", tmp);
/* Print the MAC algorithms name.
* ie SHA1
*/
tmp = gnutls_mac_get_name (gnutls_mac_get (session));
printf ("- MAC: %s\n", tmp);
return 0;
}
static int
psk_callback (gnutls_session_t session, char **username, gnutls_datum_t * key)
{
const char *hint = gnutls_psk_client_get_hint (session);
unsigned char *rawkey;
char *passwd;
int ret;
size_t res_size;
gnutls_datum_t tmp;
printf ("- PSK client callback. ");
if (hint)
printf ("PSK hint '%s'\n", hint);
else
printf ("No PSK hint\n");
if (info.psk_username)
*username = gnutls_strdup (info.psk_username);
else
{
char *tmp = NULL;
size_t n;
printf ("Enter PSK identity: ");
fflush (stdout);
getline (&tmp, &n, stdin);
if (tmp == NULL)
{
fprintf (stderr, "No username given, aborting...\n");
return GNUTLS_E_INSUFFICIENT_CREDENTIALS;
}
if (tmp[strlen (tmp) - 1] == '\n')
tmp[strlen (tmp) - 1] = '\0';
if (tmp[strlen (tmp) - 1] == '\r')
tmp[strlen (tmp) - 1] = '\0';
*username = gnutls_strdup (tmp);
free (tmp);
}
if (!*username)
return GNUTLS_E_MEMORY_ERROR;
passwd = getpass ("Enter key: ");
if (passwd == NULL)
{
fprintf (stderr, "No key given, aborting...\n");
return GNUTLS_E_INSUFFICIENT_CREDENTIALS;
}
tmp.data = passwd;
tmp.size = strlen (passwd);
res_size = tmp.size / 2 + 1;
rawkey = gnutls_malloc (res_size);
if (rawkey == NULL)
return GNUTLS_E_MEMORY_ERROR;
ret = gnutls_hex_decode (&tmp, rawkey, &res_size);
if (ret < 0)
{
fprintf (stderr, "Error deriving password: %s\n",
gnutls_strerror (ret));
gnutls_free (*username);
return ret;
}
key->data = rawkey;
key->size = res_size;
if (info.debug)
{
char hexkey[41];
res_size = sizeof (hexkey);
gnutls_hex_encode (key, hexkey, &res_size);
fprintf (stderr, "PSK username: %s\n", *username);
fprintf (stderr, "PSK hint: %s\n", hint);
fprintf (stderr, "PSK key: %s\n", hexkey);
}
return 0;
}
static void client(int sd, const char *prio)
{
int ret, ii;
gnutls_session_t session;
char buffer[MAX_BUF + 1];
gnutls_psk_client_credentials_t pskcred;
/* Need to enable anonymous KX specifically. */
const gnutls_datum_t key = { (void *) "DEADBEEF", 8 };
const char *hint;
global_init();
gnutls_global_set_log_function(tls_log_func);
if (debug)
gnutls_global_set_log_level(4711);
side = "client";
gnutls_psk_allocate_client_credentials(&pskcred);
gnutls_psk_set_client_credentials(pskcred, "test", &key,
GNUTLS_PSK_KEY_HEX);
/* Initialize TLS session
*/
gnutls_init(&session, GNUTLS_CLIENT);
/* Use default priorities */
gnutls_priority_set_direct(session, prio, NULL);
/* put the anonymous credentials to the current session
*/
gnutls_credentials_set(session, GNUTLS_CRD_PSK, pskcred);
gnutls_transport_set_int(session, sd);
/* Perform the TLS handshake
*/
ret = gnutls_handshake(session);
if (ret < 0) {
fail("client: Handshake failed\n");
gnutls_perror(ret);
goto end;
} else {
if (debug)
success("client: Handshake was completed\n");
}
/* check the hint */
hint = gnutls_psk_client_get_hint(session);
if (hint == NULL || strcmp(hint, "hint") != 0) {
fail("client: hint is not the expected: %s\n", gnutls_psk_client_get_hint(session));
goto end;
}
gnutls_record_send(session, MSG, strlen(MSG));
ret = gnutls_record_recv(session, buffer, MAX_BUF);
if (ret == 0) {
if (debug)
success
("client: Peer has closed the TLS connection\n");
goto end;
} else if (ret < 0) {
fail("client: Error: %s\n", gnutls_strerror(ret));
goto end;
}
if (debug) {
printf("- Received %d bytes: ", ret);
for (ii = 0; ii < ret; ii++) {
fputc(buffer[ii], stdout);
}
fputs("\n", stdout);
}
gnutls_bye(session, GNUTLS_SHUT_RDWR);
end:
close(sd);
gnutls_deinit(session);
gnutls_psk_free_client_credentials(pskcred);
gnutls_global_deinit();
}
int
print_info (gnutls_session_t session, const char *hostname, int insecure)
{
const char *tmp;
gnutls_credentials_type_t cred;
gnutls_kx_algorithm_t kx;
/* print the key exchange's algorithm name
*/
kx = gnutls_kx_get (session);
cred = gnutls_auth_get_type (session);
switch (cred)
{
#ifdef ENABLE_ANON
case GNUTLS_CRD_ANON:
print_dh_info (session, "Anonymous ");
break;
#endif
#ifdef ENABLE_SRP
case GNUTLS_CRD_SRP:
/* This should be only called in server
* side.
*/
if (gnutls_srp_server_get_username (session) != NULL)
printf ("- SRP authentication. Connected as '%s'\n",
gnutls_srp_server_get_username (session));
break;
#endif
#ifdef ENABLE_PSK
case GNUTLS_CRD_PSK:
/* This returns NULL in server side.
*/
if (gnutls_psk_client_get_hint (session) != NULL)
printf ("- PSK authentication. PSK hint '%s'\n",
gnutls_psk_client_get_hint (session));
/* This returns NULL in client side.
*/
if (gnutls_psk_server_get_username (session) != NULL)
printf ("- PSK authentication. Connected as '%s'\n",
gnutls_psk_server_get_username (session));
if (kx == GNUTLS_KX_DHE_PSK)
print_dh_info (session, "Ephemeral ");
break;
#endif
case GNUTLS_CRD_IA:
printf ("- TLS/IA authentication\n");
break;
case GNUTLS_CRD_CERTIFICATE:
{
char dns[256];
size_t dns_size = sizeof (dns);
unsigned int type;
/* This fails in client side */
if (gnutls_server_name_get (session, dns, &dns_size, &type, 0) == 0)
{
printf ("- Given server name[%d]: %s\n", type, dns);
}
}
if (kx == GNUTLS_KX_DHE_RSA || kx == GNUTLS_KX_DHE_DSS)
print_dh_info (session, "Ephemeral ");
print_cert_info (session, hostname, insecure);
print_cert_vrfy (session);
}
tmp = SU (gnutls_protocol_get_name (gnutls_protocol_get_version (session)));
printf ("- Version: %s\n", tmp);
tmp = SU (gnutls_kx_get_name (kx));
printf ("- Key Exchange: %s\n", tmp);
tmp = SU (gnutls_cipher_get_name (gnutls_cipher_get (session)));
printf ("- Cipher: %s\n", tmp);
tmp = SU (gnutls_mac_get_name (gnutls_mac_get (session)));
printf ("- MAC: %s\n", tmp);
tmp = SU (gnutls_compression_get_name (gnutls_compression_get (session)));
printf ("- Compression: %s\n", tmp);
if (verbose)
{
char id[32];
size_t id_size = sizeof (id);
gnutls_session_get_id (session, id, &id_size);
printf ("- Session ID: %s\n", raw_to_string (id, id_size));
}
fflush (stdout);
return 0;
}
