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#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <gnutls/gnutls.h>
#include <gnutls/x509.h>
#include "examples.h"
/* The example below demonstrates the usage of the more powerful
* gnutls_certificate_verify_peers() which can be used to check
* the hostname, as well as the key purpose OID of the peer's
* certificate. */
int verify_certificate_callback(gnutls_session_t session)
{
unsigned int status;
int ret, type;
const char *hostname;
gnutls_datum_t out;
gnutls_typed_vdata_st data[2];
/* read hostname */
hostname = gnutls_session_get_ptr(session);
/* This verification function uses the trusted CAs in the credentials
* structure. So you must have installed one or more CA certificates.
*/
data[0].type = GNUTLS_DT_DNS_HOSTNAME;
data[0].data = (void*)hostname;
data[0].size = 0;
data[1].type = GNUTLS_DT_KEY_PURPOSE_OID;
data[1].data = (void*)GNUTLS_KP_TLS_WWW_SERVER;
data[1].size = 0;
ret = gnutls_certificate_verify_peers(session, data, 2,
&status);
if (ret < 0) {
printf("Error\n");
return GNUTLS_E_CERTIFICATE_ERROR;
}
type = gnutls_certificate_type_get(session);
ret =
gnutls_certificate_verification_status_print(status, type,
&out, 0);
if (ret < 0) {
printf("Error\n");
return GNUTLS_E_CERTIFICATE_ERROR;
}
printf("%s", out.data);
gnutls_free(out.data);
if (status != 0) /* Certificate is not trusted */
return GNUTLS_E_CERTIFICATE_ERROR;
/* notify gnutls to continue handshake normally */
return 0;
}
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