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-rw-r--r--libgpo/gpo_sec.c196
1 files changed, 196 insertions, 0 deletions
diff --git a/libgpo/gpo_sec.c b/libgpo/gpo_sec.c
new file mode 100644
index 0000000..82887bc
--- /dev/null
+++ b/libgpo/gpo_sec.c
@@ -0,0 +1,196 @@
+/*
+ * Unix SMB/CIFS implementation.
+ * Group Policy Object Support
+ * Copyright (C) Guenther Deschner 2007
+ *
+ * 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/>.
+ */
+
+#include "includes.h"
+#include "libcli/security/security.h"
+#include "../libgpo/gpo.h"
+#include "auth.h"
+#include "../librpc/ndr/libndr.h"
+
+/****************************************************************
+****************************************************************/
+
+static bool gpo_sd_check_agp_object_guid(const struct security_ace_object *object)
+{
+ struct GUID ext_right_apg_guid;
+ NTSTATUS status;
+
+ if (!object) {
+ return false;
+ }
+
+ status = GUID_from_string(ADS_EXTENDED_RIGHT_APPLY_GROUP_POLICY,
+ &ext_right_apg_guid);
+ if (!NT_STATUS_IS_OK(status)) {
+ return false;
+ }
+
+ switch (object->flags) {
+ case SEC_ACE_OBJECT_TYPE_PRESENT:
+ if (GUID_equal(&object->type.type,
+ &ext_right_apg_guid)) {
+ return true;
+ }
+
+ FALL_THROUGH;
+ case SEC_ACE_INHERITED_OBJECT_TYPE_PRESENT:
+ if (GUID_equal(&object->inherited_type.inherited_type,
+ &ext_right_apg_guid)) {
+ return true;
+ }
+
+ FALL_THROUGH;
+ default:
+ break;
+ }
+
+ return false;
+}
+
+/****************************************************************
+****************************************************************/
+
+static bool gpo_sd_check_agp_object(const struct security_ace *ace)
+{
+ if (!sec_ace_object(ace->type)) {
+ return false;
+ }
+
+ return gpo_sd_check_agp_object_guid(&ace->object.object);
+}
+
+/****************************************************************
+****************************************************************/
+
+static bool gpo_sd_check_agp_access_bits(uint32_t access_mask)
+{
+ return (access_mask & SEC_ADS_CONTROL_ACCESS);
+}
+
+#if 0
+/****************************************************************
+****************************************************************/
+
+static bool gpo_sd_check_read_access_bits(uint32_t access_mask)
+{
+ uint32_t read_bits = SEC_RIGHTS_LIST_CONTENTS |
+ SEC_RIGHTS_READ_ALL_PROP |
+ SEC_RIGHTS_READ_PERMS;
+
+ return (read_bits == (access_mask & read_bits));
+}
+#endif
+
+/****************************************************************
+****************************************************************/
+
+static NTSTATUS gpo_sd_check_ace_denied_object(const struct security_ace *ace,
+ const struct security_token *token)
+{
+ if (gpo_sd_check_agp_object(ace) &&
+ gpo_sd_check_agp_access_bits(ace->access_mask) &&
+ security_token_has_sid(token, &ace->trustee)) {
+ struct dom_sid_buf sid_str;
+ DEBUG(10,("gpo_sd_check_ace_denied_object: "
+ "Access denied as of ace for %s\n",
+ dom_sid_str_buf(&ace->trustee, &sid_str)));
+ return NT_STATUS_ACCESS_DENIED;
+ }
+
+ return STATUS_MORE_ENTRIES;
+}
+
+/****************************************************************
+****************************************************************/
+
+static NTSTATUS gpo_sd_check_ace_allowed_object(const struct security_ace *ace,
+ const struct security_token *token)
+{
+ if (gpo_sd_check_agp_object(ace) &&
+ gpo_sd_check_agp_access_bits(ace->access_mask) &&
+ security_token_has_sid(token, &ace->trustee)) {
+ struct dom_sid_buf sid_str;
+ DEBUG(10,("gpo_sd_check_ace_allowed_object: "
+ "Access granted as of ace for %s\n",
+ dom_sid_str_buf(&ace->trustee, &sid_str)));
+ return NT_STATUS_OK;
+ }
+
+ return STATUS_MORE_ENTRIES;
+}
+
+/****************************************************************
+****************************************************************/
+
+static NTSTATUS gpo_sd_check_ace(const struct security_ace *ace,
+ const struct security_token *token)
+{
+ switch (ace->type) {
+ case SEC_ACE_TYPE_ACCESS_DENIED_OBJECT:
+ return gpo_sd_check_ace_denied_object(ace, token);
+ case SEC_ACE_TYPE_ACCESS_ALLOWED_OBJECT:
+ return gpo_sd_check_ace_allowed_object(ace, token);
+ default:
+ return STATUS_MORE_ENTRIES;
+ }
+}
+
+/****************************************************************
+****************************************************************/
+
+NTSTATUS gpo_apply_security_filtering(const struct GROUP_POLICY_OBJECT *gpo,
+ const struct security_token *token)
+{
+ struct security_descriptor *sd = gpo->security_descriptor;
+ struct security_acl *dacl = NULL;
+ NTSTATUS status = NT_STATUS_ACCESS_DENIED;
+ int i;
+
+ if (!token) {
+ return NT_STATUS_INVALID_USER_BUFFER;
+ }
+
+ if (!sd) {
+ return NT_STATUS_INVALID_SECURITY_DESCR;
+ }
+
+ dacl = sd->dacl;
+ if (!dacl) {
+ return NT_STATUS_INVALID_SECURITY_DESCR;
+ }
+
+ /* check all aces and only return NT_STATUS_OK (== Access granted) or
+ * NT_STATUS_ACCESS_DENIED ( == Access denied) - the default is to
+ * deny access */
+
+ for (i = 0; i < dacl->num_aces; i ++) {
+
+ status = gpo_sd_check_ace(&dacl->aces[i], token);
+
+ if (NT_STATUS_EQUAL(status, NT_STATUS_ACCESS_DENIED)) {
+ return status;
+ } else if (NT_STATUS_IS_OK(status)) {
+ return status;
+ }
+
+ continue;
+ }
+
+ return NT_STATUS_ACCESS_DENIED;
+}