Add CreateTrustedDomainRelax wrapper for fips mode

Signed-off-by: Isaac Boukris <iboukris@samba.org>
Reviewed-by: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Alexander Bokovoy <ab@samba.org>

python/samba/trust_utils.py

@@ -0,0 +1,62 @@
+# trust utils
+#
+# Copyright Isaac Boukris 2020
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program 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 General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+
+from samba.dcerpc import lsa, drsblobs
+from samba.ndr import ndr_pack
+from samba import arcfour_encrypt, string_to_byte_array
+import random
+from samba import crypto
+
+def CreateTrustedDomainRelax(lsaconn, policy, trust_info, mask, in_blob, out_blob):
+
+    def generate_AuthInfoInternal(session_key, incoming=None, outgoing=None):
+        confounder = [0] * 512
+        for i in range(len(confounder)):
+            confounder[i] = random.randint(0, 255)
+
+        trustpass = drsblobs.trustDomainPasswords()
+
+        trustpass.confounder = confounder
+        trustpass.outgoing = outgoing
+        trustpass.incoming = incoming
+
+        trustpass_blob = ndr_pack(trustpass)
+
+        encrypted_trustpass = arcfour_encrypt(session_key, trustpass_blob)
+
+        auth_blob = lsa.DATA_BUF2()
+        auth_blob.size = len(encrypted_trustpass)
+        auth_blob.data = string_to_byte_array(encrypted_trustpass)
+
+        auth_info = lsa.TrustDomainInfoAuthInfoInternal()
+        auth_info.auth_blob = auth_blob
+
+        return auth_info
+
+    session_key = lsaconn.session_key
+
+    try:
+        if lsaconn.transport_encrypted():
+            crypto.set_relax_mode()
+        auth_info = generate_AuthInfoInternal(session_key,
+                                              incoming=in_blob,
+                                              outgoing=out_blob)
+    finally:
+        crypto.set_strict_mode()
+
+    return lsaconn.CreateTrustedDomainEx2(policy, trust_info, auth_info, mask)