Adding upstream version 3.7.9.upstream/3.7.9upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 203 insertions, 0 deletions

diff --git a/doc/examples/ex-serv-psk.c b/doc/examples/ex-serv-psk.c
new file mode 100644
index 0000000..b6d5d11
--- /dev/null
+++ b/doc/examples/ex-serv-psk.c
@@ -0,0 +1,203 @@
+/* This example code is placed in the public domain. */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <errno.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <arpa/inet.h>
+#include <netinet/in.h>
+#include <string.h>
+#include <unistd.h>
+#include <gnutls/gnutls.h>
+
+#define KEYFILE "key.pem"
+#define CERTFILE "cert.pem"
+#define CAFILE "/etc/ssl/certs/ca-certificates.crt"
+#define CRLFILE "crl.pem"
+
+#define LOOP_CHECK(rval, cmd) \
+        do { \
+                rval = cmd; \
+        } while(rval == GNUTLS_E_AGAIN || rval == GNUTLS_E_INTERRUPTED)
+
+/* This is a sample TLS echo server, supporting X.509 and PSK
+   authentication.
+ */
+
+#define SOCKET_ERR(err,s) if(err==-1) {perror(s);return(1);}
+#define MAX_BUF 1024
+#define PORT 5556               /* listen to 5556 port */
+
+static int
+pskfunc(gnutls_session_t session, const char *username,
+        gnutls_datum_t * key)
+{
+        printf("psk: username %s\n", username);
+        key->data = gnutls_malloc(4);
+        key->data[0] = 0xDE;
+        key->data[1] = 0xAD;
+        key->data[2] = 0xBE;
+        key->data[3] = 0xEF;
+        key->size = 4;
+        return 0;
+}
+
+int main(void)
+{
+        int err, listen_sd;
+        int sd, ret;
+        struct sockaddr_in sa_serv;
+        struct sockaddr_in sa_cli;
+        socklen_t client_len;
+        char topbuf[512];
+        gnutls_session_t session;
+        gnutls_certificate_credentials_t x509_cred;
+        gnutls_psk_server_credentials_t psk_cred;
+        gnutls_priority_t priority_cache;
+        char buffer[MAX_BUF + 1];
+        int optval = 1;
+        int kx;
+
+        if (gnutls_check_version("3.1.4") == NULL) {
+                fprintf(stderr, "GnuTLS 3.1.4 or later is required for this example\n");
+                exit(1);
+        }
+
+        /* for backwards compatibility with gnutls < 3.3.0 */
+        gnutls_global_init();
+
+        gnutls_certificate_allocate_credentials(&x509_cred);
+        gnutls_certificate_set_x509_trust_file(x509_cred, CAFILE,
+                                               GNUTLS_X509_FMT_PEM);
+
+        gnutls_certificate_set_x509_crl_file(x509_cred, CRLFILE,
+                                             GNUTLS_X509_FMT_PEM);
+
+        gnutls_certificate_set_x509_key_file(x509_cred, CERTFILE, KEYFILE,
+                                             GNUTLS_X509_FMT_PEM);
+
+        gnutls_psk_allocate_server_credentials(&psk_cred);
+        gnutls_psk_set_server_credentials_function(psk_cred, pskfunc);
+
+        /* pre-3.6.3 equivalent:
+         * gnutls_priority_init(&priority_cache,
+         *                      "NORMAL:+PSK:+ECDHE-PSK:+DHE-PSK",
+         *                      NULL);
+         */
+        gnutls_priority_init2(&priority_cache,
+                              "+ECDHE-PSK:+DHE-PSK:+PSK",
+                              NULL, GNUTLS_PRIORITY_INIT_DEF_APPEND);
+
+        gnutls_certificate_set_known_dh_params(x509_cred, GNUTLS_SEC_PARAM_MEDIUM);
+
+        /* Socket operations
+         */
+        listen_sd = socket(AF_INET, SOCK_STREAM, 0);
+        SOCKET_ERR(listen_sd, "socket");
+
+        memset(&sa_serv, '\0', sizeof(sa_serv));
+        sa_serv.sin_family = AF_INET;
+        sa_serv.sin_addr.s_addr = INADDR_ANY;
+        sa_serv.sin_port = htons(PORT); /* Server Port number */
+
+        setsockopt(listen_sd, SOL_SOCKET, SO_REUSEADDR, (void *) &optval,
+                   sizeof(int));
+
+        err =
+            bind(listen_sd, (struct sockaddr *) &sa_serv, sizeof(sa_serv));
+        SOCKET_ERR(err, "bind");
+        err = listen(listen_sd, 1024);
+        SOCKET_ERR(err, "listen");
+
+        printf("Server ready. Listening to port '%d'.\n\n", PORT);
+
+        client_len = sizeof(sa_cli);
+        for (;;) {
+                gnutls_init(&session, GNUTLS_SERVER);
+                gnutls_priority_set(session, priority_cache);
+                gnutls_credentials_set(session, GNUTLS_CRD_CERTIFICATE,
+                                       x509_cred);
+                gnutls_credentials_set(session, GNUTLS_CRD_PSK, psk_cred);
+
+                /* request client certificate if any.
+                 */
+                gnutls_certificate_server_set_request(session,
+                                                      GNUTLS_CERT_REQUEST);
+
+                sd = accept(listen_sd, (struct sockaddr *) &sa_cli,
+                            &client_len);
+
+                printf("- connection from %s, port %d\n",
+                       inet_ntop(AF_INET, &sa_cli.sin_addr, topbuf,
+                                 sizeof(topbuf)), ntohs(sa_cli.sin_port));
+
+                gnutls_transport_set_int(session, sd);
+                LOOP_CHECK(ret, gnutls_handshake(session));
+                if (ret < 0) {
+                        close(sd);
+                        gnutls_deinit(session);
+                        fprintf(stderr,
+                                "*** Handshake has failed (%s)\n\n",
+                                gnutls_strerror(ret));
+                        continue;
+                }
+                printf("- Handshake was completed\n");
+
+                kx = gnutls_kx_get(session);
+                if (kx == GNUTLS_KX_PSK || kx == GNUTLS_KX_DHE_PSK ||
+                    kx == GNUTLS_KX_ECDHE_PSK) {
+                        printf("- User %s was connected\n",
+                               gnutls_psk_server_get_username(session));
+                }
+
+                /* see the Getting peer's information example */
+                /* print_info(session); */
+
+                for (;;) {
+                        LOOP_CHECK(ret, gnutls_record_recv(session, buffer, MAX_BUF));
+
+                        if (ret == 0) {
+                                printf
+                                    ("\n- Peer has closed the GnuTLS connection\n");
+                                break;
+                        } else if (ret < 0
+                                   && gnutls_error_is_fatal(ret) == 0) {
+                                fprintf(stderr, "*** Warning: %s\n",
+                                        gnutls_strerror(ret));
+                        } else if (ret < 0) {
+                                fprintf(stderr, "\n*** Received corrupted "
+                                        "data(%d). Closing the connection.\n\n",
+                                        ret);
+                                break;
+                        } else if (ret > 0) {
+                                /* echo data back to the client
+                                 */
+                                gnutls_record_send(session, buffer, ret);
+                        }
+                }
+                printf("\n");
+                /* do not wait for the peer to close the connection.
+                 */
+                LOOP_CHECK(ret, gnutls_bye(session, GNUTLS_SHUT_WR));
+
+                close(sd);
+                gnutls_deinit(session);
+
+        }
+        close(listen_sd);
+
+        gnutls_certificate_free_credentials(x509_cred);
+        gnutls_psk_free_server_credentials(psk_cred);
+
+        gnutls_priority_deinit(priority_cache);
+
+        gnutls_global_deinit();
+
+        return 0;
+
+}