+
+/* Structure passed to cert status callback */
+
+typedef struct tlsextstatusctx_st {
+ /* Default responder to use */
+ char *host, *path, *port;
+ int use_ssl;
+ int timeout;
+ BIO *err;
+ int verbose;
+} tlsextstatusctx;
+
+static tlsextstatusctx tlscstatp = {NULL, NULL, NULL, 0, -1, NULL, 0};
+
+/* Certificate Status callback. This is called when a client includes a
+ * certificate status request extension.
+ *
+ * This is a simplified version. It examines certificates each time and
+ * makes one OCSP responder query for each request.
+ *
+ * A full version would store details such as the OCSP certificate IDs and
+ * minimise the number of OCSP responses by caching them until they were
+ * considered "expired".
+ */
+
+static int cert_status_cb(SSL *s, void *arg)
+ {
+ tlsextstatusctx *srctx = arg;
+ BIO *err = srctx->err;
+ char *host, *port, *path;
+ int use_ssl;
+ unsigned char *rspder = NULL;
+ int rspderlen;
+ STACK *aia = NULL;
+ X509 *x = NULL;
+ X509_STORE_CTX inctx;
+ X509_OBJECT obj;
+ OCSP_REQUEST *req = NULL;
+ OCSP_RESPONSE *resp = NULL;
+ OCSP_CERTID *id = NULL;
+ STACK_OF(X509_EXTENSION) *exts;
+ int ret = SSL_TLSEXT_ERR_NOACK;
+ int i;
+#if 0
+STACK_OF(OCSP_RESPID) *ids;
+SSL_get_tlsext_status_ids(s, &ids);
+BIO_printf(err, "cert_status: received %d ids\n", sk_OCSP_RESPID_num(ids));
+#endif
+ if (srctx->verbose)
+ BIO_puts(err, "cert_status: callback called\n");
+ /* Build up OCSP query from server certificate */
+ x = SSL_get_certificate(s);
+ aia = X509_get1_ocsp(x);
+ if (aia)
+ {
+ if (!OCSP_parse_url(sk_value(aia, 0),
+ &host, &port, &path, &use_ssl))
+ {
+ BIO_puts(err, "cert_status: can't parse AIA URL\n");
+ goto err;
+ }
+ if (srctx->verbose)
+ BIO_printf(err, "cert_status: AIA URL: %s\n",
+ sk_value(aia, 0));
+ }
+ else
+ {
+ if (!srctx->host)
+ {
+ BIO_puts(srctx->err, "cert_status: no AIA and no default responder URL\n");
+ goto done;
+ }
+ host = srctx->host;
+ path = srctx->path;
+ port = srctx->port;
+ use_ssl = srctx->use_ssl;
+ }
+
+ if (!X509_STORE_CTX_init(&inctx,
+ SSL_CTX_get_cert_store(SSL_get_SSL_CTX(s)),
+ NULL, NULL))
+ goto err;
+ if (X509_STORE_get_by_subject(&inctx,X509_LU_X509,
+ X509_get_issuer_name(x),&obj) <= 0)
+ {
+ BIO_puts(err, "cert_status: Can't retrieve issuer certificate.\n");
+ X509_STORE_CTX_cleanup(&inctx);
+ goto done;
+ }
+ req = OCSP_REQUEST_new();
+ if (!req)
+ goto err;
+ id = OCSP_cert_to_id(NULL, x, obj.data.x509);
+ X509_free(obj.data.x509);
+ X509_STORE_CTX_cleanup(&inctx);
+ if (!id)
+ goto err;
+ if (!OCSP_request_add0_id(req, id))
+ goto err;
+ id = NULL;
+ /* Add any extensions to the request */
+ SSL_get_tlsext_status_exts(s, &exts);
+ for (i = 0; i < sk_X509_EXTENSION_num(exts); i++)
+ {
+ X509_EXTENSION *ext = sk_X509_EXTENSION_value(exts, i);
+ if (!OCSP_REQUEST_add_ext(req, ext, -1))
+ goto err;
+ }
+ resp = process_responder(err, req, host, path, port, use_ssl,
+ srctx->timeout);
+ if (!resp)
+ {
+ BIO_puts(err, "cert_status: error querying responder\n");
+ goto done;
+ }
+ rspderlen = i2d_OCSP_RESPONSE(resp, &rspder);
+ if (rspderlen <= 0)
+ goto err;
+ SSL_set_tlsext_status_ocsp_resp(s, rspder, rspderlen);
+ if (srctx->verbose)
+ {
+ BIO_puts(err, "cert_status: ocsp response sent:\n");
+ OCSP_RESPONSE_print(err, resp, 2);
+ }
+ ret = SSL_TLSEXT_ERR_OK;
+ done:
+ if (ret != SSL_TLSEXT_ERR_OK)
+ ERR_print_errors(err);
+ if (aia)
+ {
+ OPENSSL_free(host);
+ OPENSSL_free(path);
+ OPENSSL_free(port);
+ X509_email_free(aia);
+ }
+ if (id)
+ OCSP_CERTID_free(id);
+ if (req)
+ OCSP_REQUEST_free(req);
+ if (resp)
+ OCSP_RESPONSE_free(resp);
+ return ret;
+ err:
+ ret = SSL_TLSEXT_ERR_ALERT_FATAL;
+ goto done;
+ }
projects / openssl.git / commitdiff