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/* This example code is placed in the public domain. */
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif
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#include <stdio.h>
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#include <stdlib.h>
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#include <errno.h>
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <arpa/inet.h>
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#include <netinet/in.h>
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#include <string.h>
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#include <unistd.h>
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#include <gnutls/gnutls.h>
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#include <assert.h>
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#define KEYFILE "key.pem"
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#define CERTFILE "cert.pem"
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#define CAFILE "/etc/ssl/certs/ca-certificates.crt"
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#define CRLFILE "crl.pem"
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#define CHECK(x) assert((x)>=0)
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#define LOOP_CHECK(rval, cmd) \
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do { \
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rval = cmd; \
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} while(rval == GNUTLS_E_AGAIN || rval == GNUTLS_E_INTERRUPTED)
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/* The OCSP status file contains up to date information about revocation
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* of the server's certificate. That can be periodically be updated
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* using:
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* $ ocsptool --ask --load-cert your_cert.pem --load-issuer your_issuer.pem
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* --load-signer your_issuer.pem --outfile ocsp-status.der
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*/
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#define OCSP_STATUS_FILE "ocsp-status.der"
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/* This is a sample TLS 1.0 echo server, using X.509 authentication and
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* OCSP stapling support.
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*/
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#define MAX_BUF 1024
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#define PORT 5556 /* listen to 5556 port */
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int main(void)
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{
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int listen_sd;
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int sd, ret;
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gnutls_certificate_credentials_t x509_cred;
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gnutls_priority_t priority_cache;
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struct sockaddr_in sa_serv;
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struct sockaddr_in sa_cli;
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socklen_t client_len;
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char topbuf[512];
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gnutls_session_t session;
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char buffer[MAX_BUF + 1];
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int optval = 1;
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/* for backwards compatibility with gnutls < 3.3.0 */
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CHECK(gnutls_global_init());
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CHECK(gnutls_certificate_allocate_credentials(&x509_cred));
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CHECK(gnutls_certificate_set_x509_trust_file(x509_cred, CAFILE,
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GNUTLS_X509_FMT_PEM));
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CHECK(gnutls_certificate_set_x509_crl_file(x509_cred, CRLFILE,
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GNUTLS_X509_FMT_PEM));
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/* The following code sets the certificate key pair as well as,
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* an OCSP response which corresponds to it. It is possible
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* to set multiple key-pairs and multiple OCSP status responses
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* (the latter since 3.5.6). See the manual pages of the individual
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* functions for more information.
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*/
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CHECK(gnutls_certificate_set_x509_key_file(x509_cred, CERTFILE,
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KEYFILE,
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GNUTLS_X509_FMT_PEM));
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CHECK(gnutls_certificate_set_ocsp_status_request_file(x509_cred,
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OCSP_STATUS_FILE,
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0));
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CHECK(gnutls_priority_init(&priority_cache, NULL, NULL));
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/* Instead of the default options as shown above one could specify
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* additional options such as server precedence in ciphersuite selection
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* as follows:
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* gnutls_priority_init2(&priority_cache,
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* "%SERVER_PRECEDENCE",
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* NULL, GNUTLS_PRIORITY_INIT_DEF_APPEND);
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*/
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#if GNUTLS_VERSION_NUMBER >= 0x030506
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/* only available since GnuTLS 3.5.6, on previous versions see
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* gnutls_certificate_set_dh_params(). */
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gnutls_certificate_set_known_dh_params(x509_cred, GNUTLS_SEC_PARAM_MEDIUM);
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#endif
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/* Socket operations
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*/
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listen_sd = socket(AF_INET, SOCK_STREAM, 0);
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memset(&sa_serv, '\0', sizeof(sa_serv));
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sa_serv.sin_family = AF_INET;
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sa_serv.sin_addr.s_addr = INADDR_ANY;
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sa_serv.sin_port = htons(PORT); /* Server Port number */
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setsockopt(listen_sd, SOL_SOCKET, SO_REUSEADDR, (void *) &optval,
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sizeof(int));
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bind(listen_sd, (struct sockaddr *) &sa_serv, sizeof(sa_serv));
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listen(listen_sd, 1024);
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printf("Server ready. Listening to port '%d'.\n\n", PORT);
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client_len = sizeof(sa_cli);
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for (;;) {
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CHECK(gnutls_init(&session, GNUTLS_SERVER));
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CHECK(gnutls_priority_set(session, priority_cache));
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CHECK(gnutls_credentials_set(session, GNUTLS_CRD_CERTIFICATE,
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x509_cred));
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/* We don't request any certificate from the client.
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* If we did we would need to verify it. One way of
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* doing that is shown in the "Verifying a certificate"
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* example.
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*/
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gnutls_certificate_server_set_request(session,
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GNUTLS_CERT_IGNORE);
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gnutls_handshake_set_timeout(session,
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GNUTLS_DEFAULT_HANDSHAKE_TIMEOUT);
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sd = accept(listen_sd, (struct sockaddr *) &sa_cli,
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&client_len);
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printf("- connection from %s, port %d\n",
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inet_ntop(AF_INET, &sa_cli.sin_addr, topbuf,
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sizeof(topbuf)), ntohs(sa_cli.sin_port));
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gnutls_transport_set_int(session, sd);
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LOOP_CHECK(ret, gnutls_handshake(session));
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if (ret < 0) {
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close(sd);
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gnutls_deinit(session);
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fprintf(stderr,
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"*** Handshake has failed (%s)\n\n",
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gnutls_strerror(ret));
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continue;
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}
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printf("- Handshake was completed\n");
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/* see the Getting peer's information example */
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/* print_info(session); */
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for (;;) {
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LOOP_CHECK(ret, gnutls_record_recv(session, buffer, MAX_BUF));
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if (ret == 0) {
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printf
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("\n- Peer has closed the GnuTLS connection\n");
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break;
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} else if (ret < 0
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&& gnutls_error_is_fatal(ret) == 0) {
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fprintf(stderr, "*** Warning: %s\n",
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gnutls_strerror(ret));
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} else if (ret < 0) {
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fprintf(stderr, "\n*** Received corrupted "
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"data(%d). Closing the connection.\n\n",
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ret);
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break;
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} else if (ret > 0) {
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/* echo data back to the client
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*/
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CHECK(gnutls_record_send(session, buffer, ret));
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}
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}
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printf("\n");
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/* do not wait for the peer to close the connection.
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*/
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LOOP_CHECK(ret, gnutls_bye(session, GNUTLS_SHUT_WR));
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close(sd);
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gnutls_deinit(session);
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}
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close(listen_sd);
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gnutls_certificate_free_credentials(x509_cred);
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gnutls_priority_deinit(priority_cache);
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gnutls_global_deinit();
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return 0;
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}
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