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-rw-r--r--servers/slapd/starttls.c112
1 files changed, 112 insertions, 0 deletions
diff --git a/servers/slapd/starttls.c b/servers/slapd/starttls.c
new file mode 100644
index 0000000..993e04d
--- /dev/null
+++ b/servers/slapd/starttls.c
@@ -0,0 +1,112 @@
+/* $OpenLDAP$ */
+/* This work is part of OpenLDAP Software <http://www.openldap.org/>.
+ *
+ * Copyright 1998-2021 The OpenLDAP Foundation.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted only as authorized by the OpenLDAP
+ * Public License.
+ *
+ * A copy of this license is available in the file LICENSE in the
+ * top-level directory of the distribution or, alternatively, at
+ * <http://www.OpenLDAP.org/license.html>.
+ */
+
+#include "portable.h"
+
+#include <stdio.h>
+#include <ac/socket.h>
+#include <ac/string.h>
+
+#include "slap.h"
+#include "lber_pvt.h"
+
+const struct berval slap_EXOP_START_TLS = BER_BVC(LDAP_EXOP_START_TLS);
+
+#ifdef HAVE_TLS
+int
+starttls_extop ( Operation *op, SlapReply *rs )
+{
+ int rc;
+
+ Statslog( LDAP_DEBUG_STATS, "%s STARTTLS\n",
+ op->o_log_prefix, 0, 0, 0, 0 );
+
+ if ( op->ore_reqdata != NULL ) {
+ /* no request data should be provided */
+ rs->sr_text = "no request data expected";
+ return LDAP_PROTOCOL_ERROR;
+ }
+
+ /* acquire connection lock */
+ ldap_pvt_thread_mutex_lock( &op->o_conn->c_mutex );
+
+ /* can't start TLS if it is already started */
+ if (op->o_conn->c_is_tls != 0) {
+ rs->sr_text = "TLS already started";
+ rc = LDAP_OPERATIONS_ERROR;
+ goto done;
+ }
+
+ /* can't start TLS if there are other op's around */
+ if (( !LDAP_STAILQ_EMPTY(&op->o_conn->c_ops) &&
+ (LDAP_STAILQ_FIRST(&op->o_conn->c_ops) != op ||
+ LDAP_STAILQ_NEXT(op, o_next) != NULL)) ||
+ ( !LDAP_STAILQ_EMPTY(&op->o_conn->c_pending_ops) ))
+ {
+ rs->sr_text = "cannot start TLS when operations are outstanding";
+ rc = LDAP_OPERATIONS_ERROR;
+ goto done;
+ }
+
+ if ( !( global_disallows & SLAP_DISALLOW_TLS_2_ANON ) &&
+ ( op->o_conn->c_dn.bv_len != 0 ) )
+ {
+ Statslog( LDAP_DEBUG_STATS,
+ "%s AUTHZ anonymous mech=starttls ssf=0\n",
+ op->o_log_prefix, 0, 0, 0, 0 );
+
+ /* force to anonymous */
+ connection2anonymous( op->o_conn );
+ }
+
+ if ( ( global_disallows & SLAP_DISALLOW_TLS_AUTHC ) &&
+ ( op->o_conn->c_dn.bv_len != 0 ) )
+ {
+ rs->sr_text = "cannot start TLS after authentication";
+ rc = LDAP_OPERATIONS_ERROR;
+ goto done;
+ }
+
+ /* fail if TLS could not be initialized */
+ if ( slap_tls_ctx == NULL ) {
+ if (default_referral != NULL) {
+ /* caller will put the referral in the result */
+ rc = LDAP_REFERRAL;
+ goto done;
+ }
+
+ rs->sr_text = "Could not initialize TLS";
+ rc = LDAP_UNAVAILABLE;
+ goto done;
+ }
+
+ op->o_conn->c_is_tls = 1;
+ op->o_conn->c_needs_tls_accept = 1;
+
+ rc = LDAP_SUCCESS;
+
+done:
+ /* give up connection lock */
+ ldap_pvt_thread_mutex_unlock( &op->o_conn->c_mutex );
+
+ /* FIXME: RACE CONDITION! we give up lock before sending result
+ * Should be resolved by reworking connection state, not
+ * by moving send here (so as to ensure proper TLS sequencing)
+ */
+
+ return rc;
+}
+
+#endif /* HAVE_TLS */