From c2ab1f4696fa3f52918a126d0b37993a07f68bcb Mon Sep 17 00:00:00 2001
From: Joseph Sutton <josephsutton@catalyst.net.nz>
Date: Tue, 7 Jun 2022 17:36:43 +1200
Subject: [PATCH 07/15] CVE-2022-32743 dsdb/common: Add
 FORCE_ALLOW_VALIDATED_DNS_HOSTNAME_SPN_WRITE control

Passing this control will grant the right to set validated values for
dNSHostName and servicePrincipalName, and non-validated values for other
attributes.

BUG: https://bugzilla.samba.org/show_bug.cgi?id=14833

Signed-off-by: Joseph Sutton <josephsutton@catalyst.net.nz>
Reviewed-by: Douglas Bagnall <douglas.bagnall@catalyst.net.nz>
---
 source4/dsdb/common/util.c            | 7 +++++++
 source4/dsdb/samdb/ldb_modules/util.h | 1 +
 source4/dsdb/samdb/samdb.h            | 6 ++++++
 3 files changed, 14 insertions(+)

diff --git a/source4/dsdb/common/util.c b/source4/dsdb/common/util.c
index 1129175..88b0555 100644
--- a/source4/dsdb/common/util.c
+++ b/source4/dsdb/common/util.c
@@ -4546,6 +4546,13 @@ int dsdb_request_add_controls(struct ldb_request *req, uint32_t dsdb_flags)
 		}
 	}
 
+	if (dsdb_flags & DSDB_FLAG_FORCE_ALLOW_VALIDATED_DNS_HOSTNAME_SPN_WRITE) {
+		ret = ldb_request_add_control(req, DSDB_CONTROL_FORCE_ALLOW_VALIDATED_DNS_HOSTNAME_SPN_WRITE_OID, true, NULL);
+		if (ret != LDB_SUCCESS) {
+			return ret;
+		}
+	}
+
 	return LDB_SUCCESS;
 }
 
diff --git a/source4/dsdb/samdb/ldb_modules/util.h b/source4/dsdb/samdb/ldb_modules/util.h
index 5ecf0ee..937767a 100644
--- a/source4/dsdb/samdb/ldb_modules/util.h
+++ b/source4/dsdb/samdb/ldb_modules/util.h
@@ -39,3 +39,4 @@ struct netlogon_samlogon_response;
 #define DSDB_FLAG_TOP_MODULE		      0x00800000
 #define DSDB_FLAG_TRUSTED		      0x01000000
 #define DSDB_FLAG_REPLICATED_UPDATE           0x02000000
+#define DSDB_FLAG_FORCE_ALLOW_VALIDATED_DNS_HOSTNAME_SPN_WRITE 0x04000000
diff --git a/source4/dsdb/samdb/samdb.h b/source4/dsdb/samdb/samdb.h
index 286c97f..3db7704 100644
--- a/source4/dsdb/samdb/samdb.h
+++ b/source4/dsdb/samdb/samdb.h
@@ -226,6 +226,12 @@ struct dsdb_control_transaction_identifier {
 	struct GUID transaction_guid;
 };
 
+/*
+ * passed when we want to allow validated writes to dNSHostName and
+ * servicePrincipalName.
+ */
+#define DSDB_CONTROL_FORCE_ALLOW_VALIDATED_DNS_HOSTNAME_SPN_WRITE_OID "1.3.6.1.4.1.7165.4.3.35"
+
 #define DSDB_EXTENDED_REPLICATED_OBJECTS_OID "1.3.6.1.4.1.7165.4.4.1"
 struct dsdb_extended_replicated_object {
 	struct ldb_message *msg;
-- 
1.8.3.1