--- /dev/null
+/* $OpenBSD: ssl_verify_param.c,v 1.1 2023/05/24 08:54:59 tb Exp $ */
+
+/*
+ * Copyright (c) 2023 Theo Buehler <tb@openbsd.org>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include <err.h>
+#include <stdio.h>
+
+#include <openssl/ssl.h>
+#include <openssl/x509v3.h>
+
+unsigned int X509_VERIFY_PARAM_get_hostflags(X509_VERIFY_PARAM *param);
+
+static int
+ssl_verify_param_flags_inherited(void)
+{
+ SSL_CTX *ssl_ctx = NULL;
+ SSL *ssl = NULL;
+ X509_VERIFY_PARAM *param;
+ unsigned int defaultflags = 0;
+ unsigned int newflags = X509_CHECK_FLAG_NEVER_CHECK_SUBJECT;
+ unsigned int flags;
+ int failed = 1;
+
+ if ((ssl_ctx = SSL_CTX_new(TLS_method())) == NULL)
+ errx(1, "SSL_CTX_new");
+
+ if ((param = SSL_CTX_get0_param(ssl_ctx)) == NULL) {
+ fprintf(stderr, "FAIL: no verify param on ssl_ctx\n");
+ goto failure;
+ }
+
+ if ((flags = X509_VERIFY_PARAM_get_hostflags(param)) != defaultflags) {
+ fprintf(stderr, "FAIL: SSL_CTX default hostflags, "
+ "want: %x, got: %x\n", defaultflags, flags);
+ goto failure;
+ }
+
+ X509_VERIFY_PARAM_set_hostflags(param, newflags);
+
+ if ((flags = X509_VERIFY_PARAM_get_hostflags(param)) != newflags) {
+ fprintf(stderr, "FAIL: SSL_CTX new hostflags, "
+ "want: %x, got: %x\n", newflags, flags);
+ goto failure;
+ }
+
+ if ((ssl = SSL_new(ssl_ctx)) == NULL)
+ errx(1, "SSL_new");
+
+ if ((param = SSL_get0_param(ssl)) == NULL) {
+ fprintf(stderr, "FAIL: no verify param on ssl\n");
+ goto failure;
+ }
+
+ if ((flags = X509_VERIFY_PARAM_get_hostflags(param)) != newflags) {
+ fprintf(stderr, "FAIL: SSL inherited hostflags, "
+ "want: %x, got: %x\n", newflags, flags);
+ goto failure;
+ }
+
+ SSL_set_hostflags(ssl, defaultflags);
+
+ if ((flags = X509_VERIFY_PARAM_get_hostflags(param)) != defaultflags) {
+ fprintf(stderr, "FAIL: SSL set hostflags, "
+ "want: %x, got: %x\n", defaultflags, flags);
+ goto failure;
+ }
+
+ failed = 0;
+
+ failure:
+ SSL_CTX_free(ssl_ctx);
+ SSL_free(ssl);
+
+ return failed;
+}
+
+int
+main(void)
+{
+ int failed = 0;
+
+ failed |= ssl_verify_param_flags_inherited();
+
+ return failed;
+}