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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-28 07:33:12 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-28 07:33:12 +0000
commit36082a2fe36ecd800d784ae44c14f1f18c66a7e9 (patch)
tree6c68e0c0097987aff85a01dabddd34b862309a7c /lib/ocsp-api.c
parentInitial commit. (diff)
downloadgnutls28-upstream.tar.xz
gnutls28-upstream.zip
Adding upstream version 3.7.9.upstream/3.7.9upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'lib/ocsp-api.c')
-rw-r--r--lib/ocsp-api.c640
1 files changed, 640 insertions, 0 deletions
diff --git a/lib/ocsp-api.c b/lib/ocsp-api.c
new file mode 100644
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--- /dev/null
+++ b/lib/ocsp-api.c
@@ -0,0 +1,640 @@
+/*
+ * Copyright (C) 2012-2017 Free Software Foundation, Inc.
+ * Copyright (C) 2017 Red Hat, Inc.
+ *
+ * Author: Simon Josefsson, Nikos Mavrogiannopoulos
+ *
+ * This file is part of GnuTLS.
+ *
+ * The GnuTLS is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public License
+ * as published by the Free Software Foundation; either version 2.1 of
+ * the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program. If not, see <https://www.gnu.org/licenses/>
+ *
+ */
+
+/*
+ * Status Request (OCSP) API.
+ */
+
+#include "gnutls_int.h"
+#include "errors.h"
+#include <auth.h>
+#include <auth/cert.h>
+#include <handshake.h>
+#include <minmax.h>
+
+#ifdef ENABLE_OCSP
+
+#include <gnutls/ocsp.h>
+#include "x509/ocsp.h"
+
+/**
+ * gnutls_ocsp_status_request_get:
+ * @session: is a #gnutls_session_t type.
+ * @response: a #gnutls_datum_t with DER encoded OCSP response
+ *
+ * This function returns the OCSP status response received
+ * from the TLS server. The @response should be treated as
+ * constant. If no OCSP response is available then
+ * %GNUTLS_E_REQUESTED_DATA_NOT_AVAILABLE is returned.
+ *
+ * Returns: On success, %GNUTLS_E_SUCCESS (0) is returned,
+ * otherwise a negative error code is returned.
+ *
+ * Since: 3.1.3
+ **/
+int
+gnutls_ocsp_status_request_get(gnutls_session_t session,
+ gnutls_datum_t * response)
+{
+ return gnutls_ocsp_status_request_get2(session, 0, response);
+}
+
+/**
+ * gnutls_ocsp_status_request_get2:
+ * @session: is a #gnutls_session_t type.
+ * @idx: the index of peer's certificate
+ * @response: a #gnutls_datum_t with DER encoded OCSP response
+ *
+ * This function returns the OCSP status response received
+ * from the TLS server for the certificate index provided.
+ * The index corresponds to certificates as returned by
+ * gnutls_certificate_get_peers. When index is zero this
+ * function operates identically to gnutls_ocsp_status_request_get().
+ *
+ * The returned @response should be treated as
+ * constant. If no OCSP response is available for the
+ * given index then %GNUTLS_E_REQUESTED_DATA_NOT_AVAILABLE
+ * is returned.
+ *
+ * Returns: On success, %GNUTLS_E_SUCCESS (0) is returned,
+ * otherwise a negative error code is returned.
+ *
+ * Since: 3.6.3
+ **/
+int
+gnutls_ocsp_status_request_get2(gnutls_session_t session,
+ unsigned idx,
+ gnutls_datum_t * response)
+{
+ const version_entry_st *ver = get_version(session);
+ cert_auth_info_t info = _gnutls_get_auth_info(session, GNUTLS_CRD_CERTIFICATE);
+
+ if (!ver->tls13_sem && session->security_parameters.entity == GNUTLS_SERVER)
+ return gnutls_assert_val(GNUTLS_E_REQUESTED_DATA_NOT_AVAILABLE);
+
+ if (info == NULL || info->raw_ocsp_list == NULL ||
+ info->nocsp <= idx || info->raw_ocsp_list[idx].size == 0)
+ return
+ gnutls_assert_val
+ (GNUTLS_E_REQUESTED_DATA_NOT_AVAILABLE);
+
+ response->data = info->raw_ocsp_list[idx].data;
+ response->size = info->raw_ocsp_list[idx].size;
+
+ return 0;
+}
+
+/**
+ * gnutls_certificate_set_ocsp_status_request_function:
+ * @sc: is a #gnutls_certificate_credentials_t type.
+ * @ocsp_func: function pointer to OCSP status request callback.
+ * @ptr: opaque pointer passed to callback function
+ *
+ * This function is to be used by server to register a callback to
+ * handle OCSP status requests from the client. The callback will be
+ * invoked if the client supplied a status-request OCSP extension.
+ * The callback function prototype is:
+ *
+ * typedef int (*gnutls_status_request_ocsp_func)
+ * (gnutls_session_t session, void *ptr, gnutls_datum_t *ocsp_response);
+ *
+ * The callback will be invoked if the client requests an OCSP certificate
+ * status. The callback may return %GNUTLS_E_NO_CERTIFICATE_STATUS, if
+ * there is no recent OCSP response. If the callback returns %GNUTLS_E_SUCCESS,
+ * it is expected to have the @ocsp_response field set with a valid (DER-encoded)
+ * OCSP response. The response must be a value allocated using gnutls_malloc(),
+ * and will be deinitialized by the caller.
+ *
+ * It is possible to set a specific callback for each provided certificate
+ * using gnutls_certificate_set_ocsp_status_request_function2().
+ *
+ * Since: 3.1.3
+ **/
+void
+gnutls_certificate_set_ocsp_status_request_function
+(gnutls_certificate_credentials_t sc,
+gnutls_status_request_ocsp_func ocsp_func, void *ptr)
+{
+
+ sc->glob_ocsp_func = ocsp_func;
+ sc->glob_ocsp_func_ptr = ptr;
+}
+
+/**
+ * gnutls_certificate_set_ocsp_status_request_function2:
+ * @sc: is a #gnutls_certificate_credentials_t type.
+ * @idx: is a certificate index as returned by gnutls_certificate_set_key() and friends
+ * @ocsp_func: function pointer to OCSP status request callback.
+ * @ptr: opaque pointer passed to callback function
+ *
+ * This function is to be used by server to register a callback to
+ * provide OCSP status requests that correspond to the indexed certificate chain
+ * from the client. The callback will be invoked if the client supplied a
+ * status-request OCSP extension.
+ *
+ * The callback function prototype is:
+ *
+ * typedef int (*gnutls_status_request_ocsp_func)
+ * (gnutls_session_t session, void *ptr, gnutls_datum_t *ocsp_response);
+ *
+ * The callback will be invoked if the client requests an OCSP certificate
+ * status. The callback may return %GNUTLS_E_NO_CERTIFICATE_STATUS, if
+ * there is no recent OCSP response. If the callback returns %GNUTLS_E_SUCCESS,
+ * it is expected to have the @ocsp_response field set with a valid (DER-encoded)
+ * OCSP response. The response must be a value allocated using gnutls_malloc(),
+ * and will be deinitialized by the caller.
+ *
+ * Note: the ability to set multiple OCSP responses per credential
+ * structure via the index @idx was added in version 3.5.6. To keep
+ * backwards compatibility, it requires using gnutls_certificate_set_flags()
+ * with the %GNUTLS_CERTIFICATE_API_V2 flag to make the set certificate
+ * functions return an index usable by this function.
+ *
+ * Returns: On success, %GNUTLS_E_SUCCESS (0) is returned,
+ * otherwise a negative error code is returned.
+ *
+ * Since: 3.5.5
+ **/
+int
+gnutls_certificate_set_ocsp_status_request_function2
+(gnutls_certificate_credentials_t sc, unsigned idx, gnutls_status_request_ocsp_func ocsp_func, void *ptr)
+{
+ if (idx >= sc->ncerts)
+ return gnutls_assert_val(GNUTLS_E_REQUESTED_DATA_NOT_AVAILABLE);
+
+ sc->certs[idx].ocsp_func = ocsp_func;
+ sc->certs[idx].ocsp_func_ptr = ptr;
+
+ return 0;
+}
+
+static
+unsigned resp_matches_pcert(gnutls_ocsp_resp_t resp, const gnutls_pcert_st *cert)
+{
+ gnutls_x509_crt_t crt;
+ int ret;
+ unsigned retval;
+
+ ret = gnutls_x509_crt_init(&crt);
+ if (ret < 0)
+ return 0;
+
+ ret = gnutls_x509_crt_import(crt, &cert->cert, GNUTLS_X509_FMT_DER);
+ if (ret < 0) {
+ gnutls_assert();
+ retval = 0;
+ goto cleanup;
+ }
+
+ ret = gnutls_ocsp_resp_check_crt(resp, 0, crt);
+ if (ret == 0)
+ retval = 1;
+ else
+ retval = 0;
+
+ cleanup:
+ gnutls_x509_crt_deinit(crt);
+ return retval;
+}
+
+/**
+ * gnutls_certificate_set_ocsp_status_request_file:
+ * @sc: is a credentials structure.
+ * @response_file: a filename of the OCSP response
+ * @idx: is a certificate index as returned by gnutls_certificate_set_key() and friends
+ *
+ * This function loads the provided OCSP response. It will be
+ * sent to the client if requests an OCSP certificate status for
+ * the certificate chain specified by @idx.
+ *
+ * Note: the ability to set multiple OCSP responses per credential
+ * structure via the index @idx was added in version 3.5.6. To keep
+ * backwards compatibility, it requires using gnutls_certificate_set_flags()
+ * with the %GNUTLS_CERTIFICATE_API_V2 flag to make the set certificate
+ * functions return an index usable by this function.
+ *
+ * This function can be called multiple times since GnuTLS 3.6.3
+ * when multiple responses which apply to the chain are available.
+ * If the response provided does not match any certificates present
+ * in the chain, the code %GNUTLS_E_OCSP_MISMATCH_WITH_CERTS is returned.
+ * To revert to the previous behavior set the flag %GNUTLS_CERTIFICATE_SKIP_OCSP_RESPONSE_CHECK
+ * in the certificate credentials structure. In that case, only the
+ * end-certificate's OCSP response can be set.
+ * If the response is already expired at the time of loading the code
+ * %GNUTLS_E_EXPIRED is returned.
+ *
+ * To revert to the previous behavior of this function which does not return
+ * any errors, set the flag %GNUTLS_CERTIFICATE_SKIP_OCSP_RESPONSE_CHECK
+ *
+ * Returns: On success, %GNUTLS_E_SUCCESS (0) is returned,
+ * otherwise a negative error code is returned.
+ *
+ * Since: 3.1.3
+ **/
+int
+gnutls_certificate_set_ocsp_status_request_file(gnutls_certificate_credentials_t sc,
+ const char *response_file,
+ unsigned idx)
+{
+ int ret;
+
+ ret = gnutls_certificate_set_ocsp_status_request_file2(sc, response_file,
+ idx, GNUTLS_X509_FMT_DER);
+ if (ret >= 0)
+ return 0;
+ else
+ return ret;
+}
+
+static int append_response(gnutls_certificate_credentials_t sc, unsigned idx,
+ gnutls_ocsp_resp_t resp, const gnutls_datum_t *der)
+{
+ int ret;
+ unsigned i, found = 0;
+ unsigned try_already_set = 0;
+ time_t t;
+
+ retry:
+
+ /* iterate through all certificates in chain, and add the response
+ * to the certificate that it matches with.
+ */
+ for (i=0;i<MIN(sc->certs[idx].cert_list_length, MAX_OCSP_RESPONSES);i++) {
+ if (!try_already_set && sc->certs[idx].ocsp_data[i].response.data)
+ continue;
+
+ if (!resp_matches_pcert(resp, &sc->certs[idx].cert_list[i]))
+ continue;
+
+ t = _gnutls_ocsp_get_validity(resp);
+ /* if already invalid */
+ if (t == (time_t)-1) {
+ _gnutls_debug_log("the OCSP response associated with chain %d on pos %d, is invalid/expired\n", idx, i);
+ return GNUTLS_E_EXPIRED;
+ } else if (t == (time_t)-2) {
+ _gnutls_debug_log("the OCSP response associated with chain %d on pos %d, is too old (ignoring)\n", idx, i);
+ return 0;
+ }
+
+ if (t >= 0)
+ sc->certs[idx].ocsp_data[i].exptime = t;
+ else
+ sc->certs[idx].ocsp_data[i].exptime = 0;
+
+ _gnutls_debug_log("associating OCSP response with chain %d on pos %d\n", idx, i);
+
+ gnutls_free(sc->certs[idx].ocsp_data[i].response.data);
+
+ ret = _gnutls_set_datum(&sc->certs[idx].ocsp_data[i].response,
+ der->data,
+ der->size);
+ if (ret < 0) {
+ gnutls_assert();
+ sc->certs[idx].ocsp_data[i].response.data = NULL;
+ sc->certs[idx].ocsp_data[i].response.size = 0;
+ return ret;
+ }
+
+ if (sc->certs[idx].ocsp_data_length <= i)
+ sc->certs[idx].ocsp_data_length = i+1;
+
+ found = 1;
+ break;
+ }
+
+ if (!found) {
+ /* slow path; if we found no matching certificate for the OCSP
+ * response, try all the existing, even if a response is already
+ * given. */
+ if (!try_already_set) {
+ try_already_set = 1;
+ goto retry;
+ }
+ ret = GNUTLS_E_OCSP_MISMATCH_WITH_CERTS;
+ } else {
+ ret = 0;
+ }
+
+ return ret;
+}
+
+/**
+ * gnutls_certificate_set_ocsp_status_request_file2:
+ * @sc: is a credentials structure.
+ * @response_file: a filename of the OCSP response
+ * @idx: is a certificate index as returned by gnutls_certificate_set_key() and friends
+ * @fmt: is PEM or DER
+ *
+ * This function loads the OCSP responses to be sent to the
+ * peer for the certificate chain specified by @idx. When @fmt is
+ * set to PEM, multiple responses can be loaded.
+ *
+ * This function must be called after setting any certificates, and
+ * cannot be used for certificates that are provided via a callback --
+ * that is when gnutls_certificate_set_retrieve_function() is used. In
+ * that case consider using gnutls_certificate_set_retrieve_function3().
+ *
+ * This function can be called multiple times when multiple responses
+ * applicable to the certificate chain are available.
+ * If the response provided does not match any certificates present
+ * in the chain, the code %GNUTLS_E_OCSP_MISMATCH_WITH_CERTS is returned.
+ * If the response is already expired at the time of loading the code
+ * %GNUTLS_E_EXPIRED is returned.
+ *
+ * Returns: On success, the number of loaded responses is returned,
+ * otherwise a negative error code.
+ *
+ * Since: 3.1.3
+ **/
+int
+gnutls_certificate_set_ocsp_status_request_file2(gnutls_certificate_credentials_t sc,
+ const char *response_file,
+ unsigned idx,
+ gnutls_x509_crt_fmt_t fmt)
+{
+ gnutls_datum_t raw = {NULL, 0};
+ int ret;
+
+ if (idx >= sc->ncerts)
+ return gnutls_assert_val(GNUTLS_E_REQUESTED_DATA_NOT_AVAILABLE);
+
+ ret = gnutls_load_file(response_file, &raw);
+ if (ret < 0)
+ return gnutls_assert_val(GNUTLS_E_FILE_ERROR);
+
+ ret = gnutls_certificate_set_ocsp_status_request_mem(sc, &raw, idx, fmt);
+ gnutls_free(raw.data);
+ return ret;
+}
+
+#define PEM_OCSP_RESPONSE "OCSP RESPONSE"
+#define FULL_PEM_OCSP_RESPONSE "-----BEGIN OCSP RESPONSE"
+
+/**
+ * gnutls_certificate_set_ocsp_status_request_mem:
+ * @sc: is a credentials structure.
+ * @resp_data: a memory buffer holding an OCSP response
+ * @idx: is a certificate index as returned by gnutls_certificate_set_key() and friends
+ * @fmt: is PEM or DER
+ *
+ * This function sets the OCSP responses to be sent to the
+ * peer for the certificate chain specified by @idx. When @fmt is set
+ * to PEM, multiple responses can be loaded.
+ *
+ * Note: the ability to set multiple OCSP responses per credential
+ * structure via the index @idx was added in version 3.5.6. To keep
+ * backwards compatibility, it requires using gnutls_certificate_set_flags()
+ * with the %GNUTLS_CERTIFICATE_API_V2 flag to make the set certificate
+ * functions return an index usable by this function.
+ *
+ * This function must be called after setting any certificates, and
+ * cannot be used for certificates that are provided via a callback --
+ * that is when gnutls_certificate_set_retrieve_function() is used.
+ *
+ * This function can be called multiple times when multiple responses which
+ * apply to the certificate chain are available.
+ * If the response provided does not match any certificates present
+ * in the chain, the code %GNUTLS_E_OCSP_MISMATCH_WITH_CERTS is returned.
+ * If the response is already expired at the time of loading the code
+ * %GNUTLS_E_EXPIRED is returned.
+ *
+ * Returns: On success, the number of loaded responses is returned,
+ * otherwise a negative error code.
+ *
+ * Since: 3.6.3
+ **/
+int
+gnutls_certificate_set_ocsp_status_request_mem(gnutls_certificate_credentials_t sc,
+ const gnutls_datum_t *resp_data,
+ unsigned idx,
+ gnutls_x509_crt_fmt_t fmt)
+
+{
+ gnutls_datum_t der = {NULL, 0};
+ gnutls_ocsp_resp_t resp = NULL;
+ int ret;
+ unsigned int nresp = 0;
+
+ ret = gnutls_ocsp_resp_init(&resp);
+ if (ret < 0) {
+ return gnutls_assert_val(ret);
+ }
+
+ if (fmt == GNUTLS_X509_FMT_PEM) {
+ /* load multiple responses */
+ gnutls_datum_t p = {resp_data->data, resp_data->size};
+
+ p.data = memmem(p.data, p.size, FULL_PEM_OCSP_RESPONSE,
+ sizeof(FULL_PEM_OCSP_RESPONSE)-1);
+ if (p.data == NULL) {
+ ret = gnutls_assert_val(GNUTLS_E_REQUESTED_DATA_NOT_AVAILABLE);
+ goto cleanup;
+ }
+
+ p.size -= p.data - resp_data->data;
+ if (p.size <= 0) {
+ ret = gnutls_assert_val(GNUTLS_E_REQUESTED_DATA_NOT_AVAILABLE);
+ goto cleanup;
+ }
+
+ do {
+ ret = gnutls_pem_base64_decode2(PEM_OCSP_RESPONSE, &p, &der);
+ if (ret < 0) {
+ gnutls_assert();
+ goto cleanup;
+ }
+
+ ret = gnutls_certificate_set_ocsp_status_request_mem(sc, &der, idx,
+ GNUTLS_X509_FMT_DER);
+ if (ret < 0) {
+ gnutls_assert();
+ goto cleanup;
+ }
+ nresp++;
+
+ gnutls_free(der.data);
+
+ p.data++;
+ p.size--;
+
+ p.data = memmem(p.data, p.size, FULL_PEM_OCSP_RESPONSE,
+ sizeof(FULL_PEM_OCSP_RESPONSE)-1);
+ if (p.data == NULL)
+ break;
+ p.size = resp_data->size - (p.data - resp_data->data);
+ } while(p.size > 0);
+
+ ret = nresp;
+ } else {
+ /* DER: load a single response */
+ if (sc->flags & GNUTLS_CERTIFICATE_SKIP_OCSP_RESPONSE_CHECK) {
+ ret = gnutls_ocsp_resp_import2(resp, resp_data, GNUTLS_X509_FMT_DER);
+ if (ret >= 0) {
+ sc->certs[idx].ocsp_data[0].exptime = _gnutls_ocsp_get_validity(resp);
+ if (sc->certs[idx].ocsp_data[0].exptime <= 0)
+ sc->certs[idx].ocsp_data[0].exptime = 0;
+ }
+
+ /* quick load of first response */
+ gnutls_free(sc->certs[idx].ocsp_data[0].response.data);
+
+ ret = _gnutls_set_datum(&sc->certs[idx].ocsp_data[0].response,
+ resp_data->data,
+ resp_data->size);
+ if (ret < 0) {
+ gnutls_assert();
+ goto cleanup;
+ }
+
+ sc->certs[idx].ocsp_data_length = 1;
+ goto cleanup;
+ }
+
+ ret = gnutls_ocsp_resp_import2(resp, resp_data, GNUTLS_X509_FMT_DER);
+ if (ret < 0) {
+ gnutls_assert();
+ goto cleanup;
+ }
+
+ ret = append_response(sc, idx, resp, resp_data);
+ if (ret < 0) {
+ gnutls_assert();
+ goto cleanup;
+ }
+
+ ret = 1;
+ }
+ cleanup:
+ gnutls_free(der.data);
+ if (resp)
+ gnutls_ocsp_resp_deinit(resp);
+
+ return ret;
+}
+
+/**
+ * gnutls_certificate_get_ocsp_expiration:
+ * @sc: is a credentials structure.
+ * @idx: is a certificate chain index as returned by gnutls_certificate_set_key() and friends
+ * @oidx: is an OCSP response index
+ * @flags: should be zero
+ *
+ * This function returns the validity of the loaded OCSP responses,
+ * to provide information on when to reload/refresh them.
+ *
+ * Note that the credentials structure should be read-only when in
+ * use, thus when reloading, either the credentials structure must not
+ * be in use by any sessions, or a new credentials structure should be
+ * allocated for new sessions.
+ *
+ * When @oidx is (-1) then the minimum refresh time for all responses
+ * is returned. Otherwise the index specifies the response corresponding
+ * to the @odix certificate in the certificate chain.
+ *
+ * Returns: On success, the expiration time of the OCSP response. Otherwise
+ * (time_t)(-1) on error, or (time_t)-2 on out of bounds.
+ *
+ * Since: 3.6.3
+ **/
+time_t
+gnutls_certificate_get_ocsp_expiration(gnutls_certificate_credentials_t sc,
+ unsigned idx,
+ int oidx,
+ unsigned flags)
+{
+ unsigned j;
+
+ if (idx >= sc->ncerts)
+ return (time_t)-2;
+
+ if (oidx == -1) {
+ time_t min = 0;
+
+ for (j=0;j<MIN(sc->certs[idx].cert_list_length, MAX_OCSP_RESPONSES);j++) {
+ if (min <= 0)
+ min = sc->certs[idx].ocsp_data[j].exptime;
+ else
+ if (sc->certs[idx].ocsp_data[j].exptime > 0 &&
+ min >= sc->certs[idx].ocsp_data[j].exptime)
+ min = sc->certs[idx].ocsp_data[j].exptime;
+ }
+ return min;
+ }
+
+ if (oidx >= MAX_OCSP_RESPONSES || (unsigned)oidx >= sc->certs[idx].cert_list_length)
+ return (time_t)-2;
+
+ if (sc->certs[idx].ocsp_data[oidx].response.data == NULL)
+ return (time_t)-1;
+
+ return sc->certs[idx].ocsp_data[oidx].exptime;
+}
+
+/**
+ * gnutls_ocsp_status_request_is_checked:
+ * @session: is a gnutls session
+ * @flags: should be zero or %GNUTLS_OCSP_SR_IS_AVAIL
+ *
+ * When flags are zero this function returns non-zero if a valid OCSP status
+ * response was included in the TLS handshake. That is, an OCSP status response
+ * which is not too old, superseded or marks the certificate as revoked.
+ * It returns zero otherwise.
+ *
+ * When the flag %GNUTLS_OCSP_SR_IS_AVAIL is specified, the function
+ * returns non-zero if an OCSP status response was included in the handshake
+ * even if it was invalid. Otherwise, if no OCSP status response was included,
+ * it returns zero. The %GNUTLS_OCSP_SR_IS_AVAIL flag was introduced in GnuTLS 3.4.0.
+ *
+ * This is a helper function when needing to decide whether to perform an
+ * explicit OCSP validity check on the peer's certificate. Should be called after
+ * any of gnutls_certificate_verify_peers*() are called.
+ *
+ * This function is always usable on client side, but on server side only
+ * under TLS 1.3, which is the first version of TLS that allows cliend-side OCSP
+ * responses.
+ *
+ * Returns: Non-zero if the response was valid, or a zero if it wasn't sent,
+ * or sent and was invalid.
+ *
+ * Since: 3.1.4
+ **/
+unsigned
+gnutls_ocsp_status_request_is_checked(gnutls_session_t session,
+ unsigned int flags)
+{
+ int ret;
+ gnutls_datum_t data;
+
+ if (flags & GNUTLS_OCSP_SR_IS_AVAIL) {
+ ret = gnutls_ocsp_status_request_get(session, &data);
+ if (ret < 0)
+ return gnutls_assert_val(0);
+
+ if (data.data == NULL)
+ return gnutls_assert_val(0);
+ return 1;
+ }
+ return session->internals.ocsp_check_ok;
+}
+
+#endif