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/* This example code is placed in the public domain. */
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <unistd.h>
#include <gnutls/gnutls.h>
#include <gnutls/x509.h>
#include <gnutls/pkcs11.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <getpass.h> /* for getpass() */
/* A TLS client that loads the certificate and key.
*/
#define MAX_BUF 1024
#define MSG "GET / HTTP/1.0\r\n\r\n"
#define MIN(x,y) (((x)<(y))?(x):(y))
#define CAFILE "/etc/ssl/certs/ca-certificates.crt"
/* The URLs of the objects can be obtained
* using p11tool --list-all --login
*/
#define KEY_URL "pkcs11:manufacturer=SomeManufacturer;object=Private%20Key" \
";objecttype=private;id=%db%5b%3e%b5%72%33"
#define CERT_URL "pkcs11:manufacturer=SomeManufacturer;object=Certificate;" \
"objecttype=cert;id=db%5b%3e%b5%72%33"
extern int tcp_connect (void);
extern void tcp_close (int sd);
static int
pin_callback (void *user, int attempt, const char *token_url,
const char *token_label, unsigned int flags, char *pin,
size_t pin_max)
{
const char *password;
int len;
printf ("PIN required for token '%s' with URL '%s'\n", token_label,
token_url);
if (flags & GNUTLS_PIN_FINAL_TRY)
printf ("*** This is the final try before locking!\n");
if (flags & GNUTLS_PIN_COUNT_LOW)
printf ("*** Only few tries left before locking!\n");
if (flags & GNUTLS_PIN_WRONG)
printf ("*** Wrong PIN\n");
password = getpass ("Enter pin: ");
if (password == NULL || password[0] == 0)
{
fprintf (stderr, "No password given\n");
exit (1);
}
len = MIN (pin_max-1, strlen (password));
memcpy (pin, password, len);
pin[len] = 0;
return 0;
}
int
main (void)
{
int ret, sd, ii;
gnutls_session_t session;
gnutls_priority_t priorities_cache;
char buffer[MAX_BUF + 1];
gnutls_certificate_credentials_t xcred;
/* Allow connections to servers that have OpenPGP keys as well.
*/
gnutls_global_init ();
/* PKCS11 private key operations might require PIN.
* Register a callback.
*/
gnutls_pkcs11_set_pin_function (pin_callback, NULL);
/* X509 stuff */
gnutls_certificate_allocate_credentials (&xcred);
/* priorities */
gnutls_priority_init (&priorities_cache, "NORMAL", NULL);
/* sets the trusted cas file
*/
gnutls_certificate_set_x509_trust_file (xcred, CAFILE, GNUTLS_X509_FMT_PEM);
gnutls_certificate_set_x509_key_file (xcred, CERT_URL, KEY_URL, GNUTLS_X509_FMT_DER);
/* Initialize TLS session
*/
gnutls_init (&session, GNUTLS_CLIENT);
/* Use default priorities */
gnutls_priority_set (session, priorities_cache);
/* put the x509 credentials to the current session
*/
gnutls_credentials_set (session, GNUTLS_CRD_CERTIFICATE, xcred);
/* connect to the peer
*/
sd = tcp_connect ();
gnutls_transport_set_int (session, sd);
/* Perform the TLS handshake
*/
ret = gnutls_handshake (session);
if (ret < 0)
{
fprintf (stderr, "*** Handshake failed\n");
gnutls_perror (ret);
goto end;
}
else
{
char* desc;
desc = gnutls_session_get_desc(session);
printf ("- Session info: %s\n", desc);
gnutls_free(desc);
}
gnutls_record_send (session, MSG, strlen (MSG));
ret = gnutls_record_recv (session, buffer, MAX_BUF);
if (ret == 0)
{
printf ("- Peer has closed the TLS connection\n");
goto end;
}
else if (ret < 0)
{
fprintf (stderr, "*** Error: %s\n", gnutls_strerror (ret));
goto end;
}
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:
tcp_close (sd);
gnutls_deinit (session);
gnutls_certificate_free_credentials (xcred);
gnutls_priority_deinit (priorities_cache);
gnutls_global_deinit ();
return 0;
}
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