Adding upstream version 3.7.9.upstream/3.7.9upstream

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

1 files changed, 214 insertions, 0 deletions

diff --git a/doc/examples/ex-cert-select.c b/doc/examples/ex-cert-select.c
new file mode 100644
index 0000000..9f84b67
--- /dev/null
+++ b/doc/examples/ex-cert-select.c
@@ -0,0 +1,214 @@
+/* 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 <assert.h>
+#include <gnutls/gnutls.h>
+#include <gnutls/x509.h>
+#include <gnutls/abstract.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+
+/* A TLS client that loads the certificate and key.
+ */
+
+#define CHECK(x) assert((x)>=0)
+
+#define MAX_BUF 1024
+#define MSG "GET / HTTP/1.0\r\n\r\n"
+
+#define CERT_FILE "cert.pem"
+#define KEY_FILE "key.pem"
+#define CAFILE "/etc/ssl/certs/ca-certificates.crt"
+
+extern int tcp_connect(void);
+extern void tcp_close(int sd);
+
+static int
+cert_callback(gnutls_session_t session,
+              const gnutls_datum_t * req_ca_rdn, int nreqs,
+              const gnutls_pk_algorithm_t * sign_algos,
+              int sign_algos_length, gnutls_pcert_st ** pcert,
+              unsigned int *pcert_length, gnutls_privkey_t * pkey);
+
+gnutls_pcert_st pcrt;
+gnutls_privkey_t key;
+
+/* Load the certificate and the private key.
+ */
+static void load_keys(void)
+{
+        gnutls_datum_t data;
+
+        CHECK(gnutls_load_file(CERT_FILE, &data));
+
+        CHECK(gnutls_pcert_import_x509_raw(&pcrt, &data,
+                                           GNUTLS_X509_FMT_PEM, 0));
+
+        gnutls_free(data.data);
+
+        CHECK(gnutls_load_file(KEY_FILE, &data));
+
+        CHECK(gnutls_privkey_init(&key));
+
+        CHECK(gnutls_privkey_import_x509_raw(key, &data,
+                                             GNUTLS_X509_FMT_PEM,
+                                             NULL, 0));
+        gnutls_free(data.data);
+}
+
+int main(void)
+{
+        int ret, sd, ii;
+        gnutls_session_t session;
+        char buffer[MAX_BUF + 1];
+        gnutls_certificate_credentials_t xcred;
+        
+        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 */
+        CHECK(gnutls_global_init());
+
+        load_keys();
+
+        /* X509 stuff */
+        CHECK(gnutls_certificate_allocate_credentials(&xcred));
+
+        /* sets the trusted cas file
+         */
+        CHECK(gnutls_certificate_set_x509_trust_file(xcred, CAFILE,
+                                                     GNUTLS_X509_FMT_PEM));
+
+        gnutls_certificate_set_retrieve_function2(xcred, cert_callback);
+
+        /* Initialize TLS session 
+         */
+        CHECK(gnutls_init(&session, GNUTLS_CLIENT));
+
+        /* Use default priorities */
+        CHECK(gnutls_set_default_priority(session));
+
+        /* put the x509 credentials to the current session
+         */
+        CHECK(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);
+        }
+
+        CHECK(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);
+
+        CHECK(gnutls_bye(session, GNUTLS_SHUT_RDWR));
+
+      end:
+
+        tcp_close(sd);
+
+        gnutls_deinit(session);
+
+        gnutls_certificate_free_credentials(xcred);
+
+        gnutls_global_deinit();
+
+        return 0;
+}
+
+
+
+/* This callback should be associated with a session by calling
+ * gnutls_certificate_client_set_retrieve_function( session, cert_callback),
+ * before a handshake.
+ */
+
+static int
+cert_callback(gnutls_session_t session,
+              const gnutls_datum_t * req_ca_rdn, int nreqs,
+              const gnutls_pk_algorithm_t * sign_algos,
+              int sign_algos_length, gnutls_pcert_st ** pcert,
+              unsigned int *pcert_length, gnutls_privkey_t * pkey)
+{
+        char issuer_dn[256];
+        int i, ret;
+        size_t len;
+        gnutls_certificate_type_t type;
+
+        /* Print the server's trusted CAs
+         */
+        if (nreqs > 0)
+                printf("- Server's trusted authorities:\n");
+        else
+                printf
+                    ("- Server did not send us any trusted authorities names.\n");
+
+        /* print the names (if any) */
+        for (i = 0; i < nreqs; i++) {
+                len = sizeof(issuer_dn);
+                ret = gnutls_x509_rdn_get(&req_ca_rdn[i], issuer_dn, &len);
+                if (ret >= 0) {
+                        printf("   [%d]: ", i);
+                        printf("%s\n", issuer_dn);
+                }
+        }
+
+        /* Select a certificate and return it.
+         * The certificate must be of any of the "sign algorithms"
+         * supported by the server.
+         */
+        type = gnutls_certificate_type_get(session);
+        if (type == GNUTLS_CRT_X509) {
+                *pcert_length = 1;
+                *pcert = &pcrt;
+                *pkey = key;
+        } else {
+                return -1;
+        }
+
+        return 0;
+
+}