+ tls_error(string_sprintf("Could not read tls_dhparams \"%s\"", dhexpanded),
+ host, NULL);
+ return FALSE;
+ }
+
+/* Even if it is larger, we silently return success rather than cause things
+ * to fail out, so that a too-large DH will not knock out all TLS; it's a
+ * debatable choice. */
+if ((8*DH_size(dh)) > tls_dh_max_bits)
+ {
+ DEBUG(D_tls)
+ debug_printf("dhparams file %d bits, is > tls_dh_max_bits limit of %d",
+ 8*DH_size(dh), tls_dh_max_bits);
+ }
+else
+ {
+ SSL_CTX_set_tmp_dh(sctx, dh);
+ DEBUG(D_tls)
+ debug_printf("Diffie-Hellman initialized from %s with %d-bit prime\n",
+ dhexpanded ? dhexpanded : US"default", 8*DH_size(dh));
+ }
+
+DH_free(dh);
+BIO_free(bio);
+
+return TRUE;
+}
+
+
+
+
+#ifdef EXPERIMENTAL_OCSP
+/*************************************************
+* Load OCSP information into state *
+*************************************************/
+
+/* Called to load the OCSP response from the given file into memory, once
+caller has determined this is needed. Checks validity. Debugs a message
+if invalid.
+
+ASSUMES: single response, for single cert.
+
+Arguments:
+ sctx the SSL_CTX* to update
+ cbinfo various parts of session state
+ expanded the filename putatively holding an OCSP response
+
+*/
+
+static void
+ocsp_load_response(SSL_CTX *sctx,
+ tls_ext_ctx_cb *cbinfo,
+ const uschar *expanded)
+{
+BIO *bio;
+OCSP_RESPONSE *resp;
+OCSP_BASICRESP *basic_response;
+OCSP_SINGLERESP *single_response;
+ASN1_GENERALIZEDTIME *rev, *thisupd, *nextupd;
+X509_STORE *store;
+unsigned long verify_flags;
+int status, reason, i;
+
+cbinfo->ocsp_file_expanded = string_copy(expanded);
+if (cbinfo->ocsp_response)
+ {
+ OCSP_RESPONSE_free(cbinfo->ocsp_response);
+ cbinfo->ocsp_response = NULL;
+ }
+
+bio = BIO_new_file(CS cbinfo->ocsp_file_expanded, "rb");
+if (!bio)
+ {
+ DEBUG(D_tls) debug_printf("Failed to open OCSP response file \"%s\"\n",
+ cbinfo->ocsp_file_expanded);
+ return;
+ }
+
+resp = d2i_OCSP_RESPONSE_bio(bio, NULL);
+BIO_free(bio);
+if (!resp)
+ {
+ DEBUG(D_tls) debug_printf("Error reading OCSP response.\n");
+ return;
+ }
+
+status = OCSP_response_status(resp);
+if (status != OCSP_RESPONSE_STATUS_SUCCESSFUL)
+ {
+ DEBUG(D_tls) debug_printf("OCSP response not valid: %s (%d)\n",
+ OCSP_response_status_str(status), status);
+ return;