[SCM] Samba Shared Repository - branch master updated

Andrew Bartlett abartlet at samba.org
Tue Oct 30 09:33:03 UTC 2018


The branch, master has been updated
       via  852e1db dsdb: Add comments explaining the limitations of our current backlink behaviour
       via  7a36cb3 s4:samldb: internally use extended dns while changing the primaryGroupID field
       via  0386307 s4:repl_meta_data: add support for DSDB_CONTROL_DBCHECK_FIX_LINK_DN_SID
       via  1ef145d s4:repl_meta_data: pass down struct replmd_replicated_request to replmd_modify_la_replace()
       via  738b52e s4:repl_meta_data: pass down struct replmd_replicated_request to replmd_modify_la_delete()
       via  70a306d s4:repl_meta_data: add missing 
 to a DEBUG message in replmd_modify_la_add()
       via  42e69a8 s4:repl_meta_data: pass down struct replmd_replicated_request to replmd_modify_la_add()
       via  966c7fe s4:repl_meta_data: pass down struct replmd_replicated_request to replmd_modify_handle_linked_attribs()
       via  f81771c blackbox/dbcheck-links: Test broken links with missing <SID=...> on linked attributes
       via  a801799 dbchecker: Fix missing <SID=...> on linked attributes
       via  c5c99b5 dbchecker: improve verbose output of do_modify()
       via  bb9c9e4 s4:dsdb: add DSDB_CONTROL_DBCHECK_FIX_LINK_DN_SID oid
       via  364ed53 testprogs/blackbox: add samba4.blackbox.test_primary_group test
       via  60131b4 s4:dsdb: fix comment on DSDB_CONTROL_DBCHECK_FIX_LINK_DN_NAME
       via  0189f23 schema_samba4.ldif: add allocation of DSDB_CONTROL_DBCHECK_FIX_LINK_DN_NAME
      from  500a729 tdb: Make record deletion circular-chain safe

https://git.samba.org/?p=samba.git;a=shortlog;h=master


- Log -----------------------------------------------------------------
commit 852e1db12b0afa04a738c03bb2609c084fe96a7f
Author: Andrew Bartlett <abartlet at samba.org>
Date:   Tue Oct 30 15:56:43 2018 +1300

    dsdb: Add comments explaining the limitations of our current backlink behaviour
    
    BUG: https://bugzilla.samba.org/show_bug.cgi?id=13418
    
    Signed-off-by: Andrew Bartlett <abartlet at samba.org>
    Reviewed-by: Tim Beale <timbeale at catalyst.net.nz>
    
    Autobuild-User(master): Andrew Bartlett <abartlet at samba.org>
    Autobuild-Date(master): Tue Oct 30 10:32:51 CET 2018 on sn-devel-144

commit 7a36cb30b716d56b84e894851c1a18e9eb3a0964
Author: Stefan Metzmacher <metze at samba.org>
Date:   Fri Aug 24 15:33:49 2018 +0200

    s4:samldb: internally use extended dns while changing the primaryGroupID field
    
    This is important, otherwise we'll loose the <SID=> component of the
    linked attribute.
    
    BUG: https://bugzilla.samba.org/show_bug.cgi?id=13418
    
    Signed-off-by: Stefan Metzmacher <metze at samba.org>
    Reviewed-by: Andrew Bartlett <abartlet at samba.org>

commit 0386307e34097f5d9233c970983c7306d1705a87
Author: Stefan Metzmacher <metze at samba.org>
Date:   Fri Oct 12 15:56:18 2018 +0200

    s4:repl_meta_data: add support for DSDB_CONTROL_DBCHECK_FIX_LINK_DN_SID
    
    This will be used by dbcheck in the next commits.
    
    BUG: https://bugzilla.samba.org/show_bug.cgi?id=13418
    
    Signed-off-by: Stefan Metzmacher <metze at samba.org>
    Reviewed-by: Andrew Bartlett <abartlet at samba.org>

commit 1ef145d9d72d847055f6aba8a0070b3e1cfdabbc
Author: Stefan Metzmacher <metze at samba.org>
Date:   Fri Oct 12 18:43:25 2018 +0200

    s4:repl_meta_data: pass down struct replmd_replicated_request to replmd_modify_la_replace()
    
    This will simplify further changes.
    
    BUG: https://bugzilla.samba.org/show_bug.cgi?id=13418
    
    Signed-off-by: Stefan Metzmacher <metze at samba.org>
    Reviewed-by: Andrew Bartlett <abartlet at samba.org>

commit 738b52eb0856c8fcdbb8589e8061bcc14700c23a
Author: Stefan Metzmacher <metze at samba.org>
Date:   Fri Oct 12 18:43:25 2018 +0200

    s4:repl_meta_data: pass down struct replmd_replicated_request to replmd_modify_la_delete()
    
    This will simplify further changes.
    
    BUG: https://bugzilla.samba.org/show_bug.cgi?id=13418
    
    Signed-off-by: Stefan Metzmacher <metze at samba.org>
    Reviewed-by: Andrew Bartlett <abartlet at samba.org>

commit 70a306d0bd6806d1fd00d45e3d8cc70c73d09f79
Author: Stefan Metzmacher <metze at samba.org>
Date:   Fri Oct 12 19:34:08 2018 +0200

    s4:repl_meta_data: add missing \n to a DEBUG message in replmd_modify_la_add()
    
    BUG: https://bugzilla.samba.org/show_bug.cgi?id=13418
    
    Signed-off-by: Stefan Metzmacher <metze at samba.org>
    Reviewed-by: Andrew Bartlett <abartlet at samba.org>

commit 42e69a86ca583e3cb20c63b9c6930b4b3425485d
Author: Stefan Metzmacher <metze at samba.org>
Date:   Fri Oct 12 18:43:25 2018 +0200

    s4:repl_meta_data: pass down struct replmd_replicated_request to replmd_modify_la_add()
    
    This will simplify further changes.
    
    BUG: https://bugzilla.samba.org/show_bug.cgi?id=13418
    
    Signed-off-by: Stefan Metzmacher <metze at samba.org>
    Reviewed-by: Andrew Bartlett <abartlet at samba.org>

commit 966c7febaf0245516481bde924ea6cd738eeb78b
Author: Stefan Metzmacher <metze at samba.org>
Date:   Fri Oct 12 18:43:25 2018 +0200

    s4:repl_meta_data: pass down struct replmd_replicated_request to replmd_modify_handle_linked_attribs()
    
    This will simplify further changes.
    
    BUG: https://bugzilla.samba.org/show_bug.cgi?id=13418
    
    Signed-off-by: Stefan Metzmacher <metze at samba.org>
    Reviewed-by: Andrew Bartlett <abartlet at samba.org>

commit f81771c8593327e058b9cb4330d7e77083df3ea9
Author: Stefan Metzmacher <metze at samba.org>
Date:   Fri Oct 12 15:56:18 2018 +0200

    blackbox/dbcheck-links: Test broken links with missing <SID=...> on linked attributes
    
    BUG: https://bugzilla.samba.org/show_bug.cgi?id=13418
    
    Signed-off-by: Stefan Metzmacher <metze at samba.org>
    Reviewed-by: Andrew Bartlett <abartlet at samba.org>

commit a801799ebe26780653f4ed3fa3fc633e31871f7d
Author: Stefan Metzmacher <metze at samba.org>
Date:   Fri Oct 12 15:56:18 2018 +0200

    dbchecker: Fix missing <SID=...> on linked attributes
    
    BUG: https://bugzilla.samba.org/show_bug.cgi?id=13418
    
    Signed-off-by: Stefan Metzmacher <metze at samba.org>
    Reviewed-by: Andrew Bartlett <abartlet at samba.org>

commit c5c99b569569ce36cac94e967ca53e3182abd6f7
Author: Stefan Metzmacher <metze at samba.org>
Date:   Mon Oct 8 17:14:28 2018 +0200

    dbchecker: improve verbose output of do_modify()
    
    This makes it easier to debug dbcheck problems.
    
    BUG: https://bugzilla.samba.org/show_bug.cgi?id=13418
    
    Signed-off-by: Stefan Metzmacher <metze at samba.org>
    Reviewed-by: Andrew Bartlett <abartlet at samba.org>

commit bb9c9e49a5e82f19626cb1b12ec9189fff5114e8
Author: Stefan Metzmacher <metze at samba.org>
Date:   Mon Oct 8 17:13:52 2018 +0200

    s4:dsdb: add DSDB_CONTROL_DBCHECK_FIX_LINK_DN_SID oid
    
    This will be used to fix missing <SID=> components in future.
    
    BUG: https://bugzilla.samba.org/show_bug.cgi?id=13418
    
    Signed-off-by: Stefan Metzmacher <metze at samba.org>
    Reviewed-by: Andrew Bartlett <abartlet at samba.org>

commit 364ed537e0bcb3a97cae0f2d1ff72de9423ce0e6
Author: Stefan Metzmacher <metze at samba.org>
Date:   Tue Oct 16 15:16:18 2018 +0200

    testprogs/blackbox: add samba4.blackbox.test_primary_group test
    
    This demonstrates the bug, that happens when the primaryGroupID
    of a user is changed.
    
    BUG: https://bugzilla.samba.org/show_bug.cgi?id=13418
    
    Signed-off-by: Stefan Metzmacher <metze at samba.org>
    Reviewed-by: Andrew Bartlett <abartlet at samba.org>

commit 60131b4452d43b3792e7f27a4190c88e7aabb1b4
Author: Stefan Metzmacher <metze at samba.org>
Date:   Mon Oct 8 17:13:13 2018 +0200

    s4:dsdb: fix comment on DSDB_CONTROL_DBCHECK_FIX_LINK_DN_NAME
    
    Signed-off-by: Stefan Metzmacher <metze at samba.org>
    Reviewed-by: Andrew Bartlett <abartlet at samba.org>

commit 0189f23f5bda263c7462366ee16b2fe4bcda0119
Author: Stefan Metzmacher <metze at samba.org>
Date:   Mon Oct 8 15:35:52 2018 +0200

    schema_samba4.ldif: add allocation of DSDB_CONTROL_DBCHECK_FIX_LINK_DN_NAME
    
    This was already allocated in source4/dsdb/samdb/samdb.h with
    commit 22208f52e6096fbe9413b8ff339d9446851e0874.
    
    Signed-off-by: Stefan Metzmacher <metze at samba.org>
    Reviewed-by: Andrew Bartlett <abartlet at samba.org>

-----------------------------------------------------------------------

Summary of changes:
 python/samba/dbchecker.py                          |  45 +++-
 source4/dsdb/pydsdb.c                              |   1 +
 source4/dsdb/samdb/ldb_modules/extended_dn_store.c |   7 +
 source4/dsdb/samdb/ldb_modules/linked_attributes.c |  18 +-
 source4/dsdb/samdb/ldb_modules/repl_meta_data.c    | 269 +++++++++++++++------
 source4/dsdb/samdb/ldb_modules/samldb.c            |  41 +++-
 source4/dsdb/samdb/samdb.h                         |   5 +-
 ...eck-link-output-missing-link-sid-corruption.txt |   8 +
 source4/selftest/tests.py                          |   2 +
 source4/setup/schema_samba4.ldif                   |   2 +
 testprogs/blackbox/dbcheck-links.sh                | 110 +++++++++
 testprogs/blackbox/test_primary_group.sh           |  90 +++++++
 12 files changed, 515 insertions(+), 83 deletions(-)
 create mode 100644 source4/selftest/provisions/release-4-5-0-pre1/expected-dbcheck-link-output-missing-link-sid-corruption.txt
 create mode 100755 testprogs/blackbox/test_primary_group.sh


Changeset truncated at 500 lines:

diff --git a/python/samba/dbchecker.py b/python/samba/dbchecker.py
index dcdbb893..c70ca7b 100644
--- a/python/samba/dbchecker.py
+++ b/python/samba/dbchecker.py
@@ -79,6 +79,7 @@ class dbcheck(object):
         self.fix_all_string_dn_component_mismatch = False
         self.fix_all_GUID_dn_component_mismatch = False
         self.fix_all_SID_dn_component_mismatch = False
+        self.fix_all_SID_dn_component_missing = False
         self.fix_all_old_dn_string_component_mismatch = False
         self.fix_all_metadata = False
         self.fix_time_metadata = False
@@ -402,10 +403,11 @@ systemFlags: -1946157056%s""" % (dn, guid_suffix),
 
     def do_modify(self, m, controls, msg, validate=True):
         '''perform a modify with optional verbose output'''
+        controls = controls + ["local_oid:%s:0" % dsdb.DSDB_CONTROL_DBCHECK]
         if self.verbose:
             self.report(self.samdb.write_ldif(m, ldb.CHANGETYPE_MODIFY))
+            self.report("controls: %r" % controls)
         try:
-            controls = controls + ["local_oid:%s:0" % dsdb.DSDB_CONTROL_DBCHECK]
             self.samdb.modify(m, controls=controls, validate=validate)
         except Exception as err:
             if self.in_transaction:
@@ -697,6 +699,38 @@ newSuperior: %s""" % (str(from_dn), str(to_rdn), str(to_base)))
                           "Failed to fix incorrect DN %s on attribute %s" % (mismatch_type, attrname)):
             self.report("Fixed incorrect DN %s on attribute %s" % (mismatch_type, attrname))
 
+    def err_dn_component_missing_target_sid(self, dn, attrname, val, dsdb_dn, target_sid_blob):
+        """handle a DN string being incorrect"""
+        self.report("ERROR: missing DN SID component for %s in object %s - %s" % (attrname, dn, val))
+
+        if len(dsdb_dn.prefix) != 0:
+            self.report("Not fixing missing DN SID on DN+BINARY or DN+STRING")
+            return
+
+        correct_dn = ldb.Dn(self.samdb, dsdb_dn.dn.extended_str())
+        correct_dn.set_extended_component("SID", target_sid_blob)
+
+        if not self.confirm_all('Change DN to %s?' % correct_dn.extended_str(),
+                                'fix_all_SID_dn_component_missing'):
+            self.report("Not fixing missing DN SID component")
+            return
+
+        target_guid_blob = correct_dn.get_extended_component("GUID")
+        guid_sid_dn = ldb.Dn(self.samdb, "")
+        guid_sid_dn.set_extended_component("GUID", target_guid_blob)
+        guid_sid_dn.set_extended_component("SID", target_sid_blob)
+
+        m = ldb.Message()
+        m.dn = dn
+        m['new_value'] = ldb.MessageElement(guid_sid_dn.extended_str(), ldb.FLAG_MOD_ADD, attrname)
+        controls = [
+            "show_recycled:1",
+            "local_oid:%s:1" % dsdb.DSDB_CONTROL_DBCHECK_FIX_LINK_DN_SID
+        ]
+        if self.do_modify(m, controls,
+                          "Failed to ADD missing DN SID on attribute %s" % (attrname)):
+            self.report("Fixed missing DN SID on attribute %s" % (attrname))
+
     def err_unknown_attribute(self, obj, attrname):
         '''handle an unknown attribute error'''
         self.report("ERROR: unknown attribute '%s' in %s" % (attrname, obj.dn))
@@ -1322,7 +1356,14 @@ newSuperior: %s""" % (str(from_dn), str(to_rdn), str(to_base)))
                                                       res[0].dn, "GUID")
                 continue
 
-            if res[0].dn.get_extended_component("SID") != dsdb_dn.dn.get_extended_component("SID"):
+            target_sid = res[0].dn.get_extended_component("SID")
+            link_sid = dsdb_dn.dn.get_extended_component("SID")
+            if link_sid is None and target_sid is not None:
+                error_count += 1
+                self.err_dn_component_missing_target_sid(obj.dn, attrname, val,
+                                                         dsdb_dn, target_sid)
+                continue
+            if link_sid != target_sid:
                 error_count += 1
                 self.err_dn_component_target_mismatch(obj.dn, attrname, val, dsdb_dn,
                                                       res[0].dn, "SID")
diff --git a/source4/dsdb/pydsdb.c b/source4/dsdb/pydsdb.c
index 19fb75d..36cc80d 100644
--- a/source4/dsdb/pydsdb.c
+++ b/source4/dsdb/pydsdb.c
@@ -1659,6 +1659,7 @@ MODULE_INIT_FUNC(dsdb)
 	ADD_DSDB_STRING(DSDB_CONTROL_DBCHECK_MODIFY_RO_REPLICA);
 	ADD_DSDB_STRING(DSDB_CONTROL_DBCHECK_FIX_DUPLICATE_LINKS);
 	ADD_DSDB_STRING(DSDB_CONTROL_DBCHECK_FIX_LINK_DN_NAME);
+	ADD_DSDB_STRING(DSDB_CONTROL_DBCHECK_FIX_LINK_DN_SID);
 	ADD_DSDB_STRING(DSDB_CONTROL_REPLMD_VANISH_LINKS);
 	ADD_DSDB_STRING(DSDB_CONTROL_PERMIT_INTERDOMAIN_TRUST_UAC_OID);
 	ADD_DSDB_STRING(DSDB_CONTROL_SKIP_DUPLICATES_CHECK_OID);
diff --git a/source4/dsdb/samdb/ldb_modules/extended_dn_store.c b/source4/dsdb/samdb/ldb_modules/extended_dn_store.c
index a37b55c..6bfced3 100644
--- a/source4/dsdb/samdb/ldb_modules/extended_dn_store.c
+++ b/source4/dsdb/samdb/ldb_modules/extended_dn_store.c
@@ -722,6 +722,7 @@ static int extended_dn_modify(struct ldb_module *module, struct ldb_request *req
 	unsigned int i, j;
 	struct extended_dn_context *ac;
 	struct ldb_control *fix_links_control = NULL;
+	struct ldb_control *fix_link_sid_ctrl = NULL;
 	int ret;
 
 	if (ldb_dn_is_special(req->op.mod.message->dn)) {
@@ -746,6 +747,12 @@ static int extended_dn_modify(struct ldb_module *module, struct ldb_request *req
 		return ldb_next_request(module, req);
 	}
 
+	fix_link_sid_ctrl = ldb_request_get_control(ac->req,
+					DSDB_CONTROL_DBCHECK_FIX_LINK_DN_SID);
+	if (fix_link_sid_ctrl != NULL) {
+		return ldb_next_request(module, req);
+	}
+
 	for (i=0; i < req->op.mod.message->num_elements; i++) {
 		const struct ldb_message_element *el = &req->op.mod.message->elements[i];
 		const struct dsdb_attribute *schema_attr
diff --git a/source4/dsdb/samdb/ldb_modules/linked_attributes.c b/source4/dsdb/samdb/ldb_modules/linked_attributes.c
index 57d2507..2568d4d 100644
--- a/source4/dsdb/samdb/ldb_modules/linked_attributes.c
+++ b/source4/dsdb/samdb/ldb_modules/linked_attributes.c
@@ -25,7 +25,23 @@
  *
  *  Component: ldb linked_attributes module
  *
- *  Description: Module to ensure linked attribute pairs remain in sync
+ *  Description: Module to ensure linked attribute pairs (i.e. forward-links
+ *  and backlinks) remain in sync.
+ *
+ *  Backlinks are 'plain' links (without extra metadata). When the link target
+ *  object is modified (e.g. renamed), we use the backlinks to keep the link
+ *  source object updated. Note there are some cases where we can't do this:
+ *    - one-way links, which don't have a corresponding backlink
+ *    - two-way deactivated links, i.e. when a user is removed from a group,
+ *      the forward 'member' link still exists (but is inactive), however, the
+ *      'memberOf' backlink is deleted.
+ *  In these cases, we can end up with a dangling forward link which is
+ *  incorrect (i.e. the target has been renamed or deleted). We have dbcheck
+ *  rules to detect and fix this, and cope otherwise by filtering at runtime
+ *  (i.e. in the extended_dn module).
+ *
+ *  See also repl_meta_data.c, which handles updating links for deleted
+ *  objects, as well as link changes received from another DC.
  *
  *  Author: Andrew Bartlett
  */
diff --git a/source4/dsdb/samdb/ldb_modules/repl_meta_data.c b/source4/dsdb/samdb/ldb_modules/repl_meta_data.c
index 584fd21..b1f1523 100644
--- a/source4/dsdb/samdb/ldb_modules/repl_meta_data.c
+++ b/source4/dsdb/samdb/ldb_modules/repl_meta_data.c
@@ -112,6 +112,8 @@ struct replmd_replicated_request {
 	bool is_urgent;
 
 	bool isDeleted;
+
+	bool fix_link_sid;
 };
 
 static int replmd_replicated_apply_merge(struct replmd_replicated_request *ar);
@@ -2402,12 +2404,11 @@ static int replmd_update_la_val(TALLOC_CTX *mem_ctx, struct ldb_val *v, struct d
  */
 static int replmd_modify_la_add(struct ldb_module *module,
 				struct replmd_private *replmd_private,
-				const struct dsdb_schema *schema,
+				struct replmd_replicated_request *ac,
 				struct ldb_message *msg,
 				struct ldb_message_element *el,
 				struct ldb_message_element *old_el,
 				const struct dsdb_attribute *schema_attr,
-				uint64_t seq_num,
 				time_t t,
 				struct ldb_dn *msg_dn,
 				struct ldb_request *parent)
@@ -2420,17 +2421,10 @@ static int replmd_modify_la_add(struct ldb_module *module,
 	unsigned old_num_values = old_el ? old_el->num_values : 0;
 	unsigned num_values = 0;
 	unsigned max_num_values;
-	const struct GUID *invocation_id;
 	struct ldb_context *ldb = ldb_module_get_ctx(module);
 	NTTIME now;
 	unix_to_nt_time(&now, t);
 
-	invocation_id = samdb_ntds_invocation_id(ldb);
-	if (!invocation_id) {
-		talloc_free(tmp_ctx);
-		return LDB_ERR_OPERATIONS_ERROR;
-	}
-
 	/* get the DNs to be added, fully parsed.
 	 *
 	 * We need full parsing because they came off the wire and we don't
@@ -2457,7 +2451,7 @@ static int replmd_modify_la_add(struct ldb_module *module,
 	max_num_values = old_num_values + el->num_values;
 	if (max_num_values < old_num_values) {
 		DEBUG(0, ("we seem to have overflow in replmd_modify_la_add. "
-			  "old values: %u, new values: %u, sum: %u",
+			  "old values: %u, new values: %u, sum: %u\n",
 			  old_num_values, el->num_values, max_num_values));
 		talloc_free(tmp_ctx);
 		return LDB_ERR_OPERATIONS_ERROR;
@@ -2493,6 +2487,109 @@ static int replmd_modify_la_add(struct ldb_module *module,
 			return err;
 		}
 
+		if (ac->fix_link_sid) {
+			char *fixed_dnstring = NULL;
+			struct dom_sid tmp_sid = { 0, };
+			DATA_BLOB sid_blob = data_blob_null;
+			enum ndr_err_code ndr_err;
+			NTSTATUS status;
+			int num;
+
+			if (exact == NULL) {
+				talloc_free(tmp_ctx);
+				return ldb_operr(ldb);
+			}
+
+			if (dns[i].dsdb_dn->dn_format != DSDB_NORMAL_DN) {
+				talloc_free(tmp_ctx);
+				return ldb_operr(ldb);
+			}
+
+			/*
+			 * Only "<GUID=...><SID=...>" is allowed.
+			 *
+			 * We get the GUID to just to find the old
+			 * value and the SID in order to add it
+			 * to the found value.
+			 */
+
+			num = ldb_dn_get_comp_num(dns[i].dsdb_dn->dn);
+			if (num != 0) {
+				talloc_free(tmp_ctx);
+				return ldb_operr(ldb);
+			}
+
+			num = ldb_dn_get_extended_comp_num(dns[i].dsdb_dn->dn);
+			if (num != 2) {
+				talloc_free(tmp_ctx);
+				return ldb_operr(ldb);
+			}
+
+			status = dsdb_get_extended_dn_sid(exact->dsdb_dn->dn,
+							  &tmp_sid, "SID");
+			if (NT_STATUS_EQUAL(status, NT_STATUS_OBJECT_NAME_NOT_FOUND)) {
+				/* this is what we expect */
+			} else if (NT_STATUS_IS_OK(status)) {
+				struct GUID_txt_buf guid_str;
+				ldb_debug_set(ldb, LDB_DEBUG_FATAL,
+						       "i[%u] SID NOT MISSING... Attribute %s already "
+						       "exists for target GUID %s, SID %s, DN: %s",
+						       i, el->name,
+						       GUID_buf_string(&exact->guid,
+								       &guid_str),
+						       dom_sid_string(tmp_ctx, &tmp_sid),
+						       dsdb_dn_get_extended_linearized(tmp_ctx,
+							       exact->dsdb_dn, 1));
+				talloc_free(tmp_ctx);
+				return LDB_ERR_ATTRIBUTE_OR_VALUE_EXISTS;
+			} else {
+				talloc_free(tmp_ctx);
+				return ldb_operr(ldb);
+			}
+
+			status = dsdb_get_extended_dn_sid(dns[i].dsdb_dn->dn,
+							  &tmp_sid, "SID");
+			if (!NT_STATUS_IS_OK(status)) {
+				struct GUID_txt_buf guid_str;
+				ldb_asprintf_errstring(ldb,
+						       "NO SID PROVIDED... Attribute %s already "
+						       "exists for target GUID %s",
+						       el->name,
+						       GUID_buf_string(&exact->guid,
+								       &guid_str));
+				talloc_free(tmp_ctx);
+				return LDB_ERR_ATTRIBUTE_OR_VALUE_EXISTS;
+			}
+
+			ndr_err = ndr_push_struct_blob(&sid_blob, tmp_ctx, &tmp_sid,
+						       (ndr_push_flags_fn_t)ndr_push_dom_sid);
+			if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
+				talloc_free(tmp_ctx);
+				return ldb_operr(ldb);
+			}
+
+			ret = ldb_dn_set_extended_component(exact->dsdb_dn->dn, "SID", &sid_blob);
+			data_blob_free(&sid_blob);
+			if (ret != LDB_SUCCESS) {
+				talloc_free(tmp_ctx);
+				return ret;
+			}
+
+			fixed_dnstring = dsdb_dn_get_extended_linearized(
+					new_values, exact->dsdb_dn, 1);
+			if (fixed_dnstring == NULL) {
+				talloc_free(tmp_ctx);
+				return ldb_operr(ldb);
+			}
+
+			/*
+			 * We just replace the existing value...
+			 */
+			*exact->v = data_blob_string_const(fixed_dnstring);
+
+			continue;
+		}
+
 		if (exact != NULL) {
 			/*
 			 * We are trying to add one that exists, which is only
@@ -2526,15 +2623,16 @@ static int replmd_modify_la_add(struct ldb_module *module,
 			ret = replmd_update_la_val(new_values, exact->v,
 						   dns[i].dsdb_dn,
 						   exact->dsdb_dn,
-						   invocation_id, seq_num,
-						   seq_num, now, false);
+						   &ac->our_invocation_id,
+						   ac->seq_num, ac->seq_num,
+						   now, false);
 			if (ret != LDB_SUCCESS) {
 				talloc_free(tmp_ctx);
 				return ret;
 			}
 
 			ret = replmd_add_backlink(module, replmd_private,
-						  schema,
+						  ac->schema,
 						  msg_dn,
 						  &dns[i].guid, 
 						  true,
@@ -2576,14 +2674,14 @@ static int replmd_modify_la_add(struct ldb_module *module,
 		}
 
 		ret = replmd_add_backlink(module, replmd_private,
-					  schema, msg_dn,
+					  ac->schema, msg_dn,
 					  &dns[i].guid,
 					  true, schema_attr,
 					  parent);
 		/* Make the new linked attribute ldb_val. */
 		ret = replmd_build_la_val(new_values, &new_values[num_values],
-					  dns[i].dsdb_dn, invocation_id,
-					  seq_num, now);
+					  dns[i].dsdb_dn, &ac->our_invocation_id,
+					  ac->seq_num, now);
 		if (ret != LDB_SUCCESS) {
 			talloc_free(tmp_ctx);
 			return ret;
@@ -2622,12 +2720,11 @@ static int replmd_modify_la_add(struct ldb_module *module,
  */
 static int replmd_modify_la_delete(struct ldb_module *module,
 				   struct replmd_private *replmd_private,
-				   const struct dsdb_schema *schema,
+				   struct replmd_replicated_request *ac,
 				   struct ldb_message *msg,
 				   struct ldb_message_element *el,
 				   struct ldb_message_element *old_el,
 				   const struct dsdb_attribute *schema_attr,
-				   uint64_t seq_num,
 				   time_t t,
 				   struct ldb_dn *msg_dn,
 				   struct ldb_request *parent)
@@ -2641,16 +2738,10 @@ static int replmd_modify_la_delete(struct ldb_module *module,
 	bool vanish_links = false;
 	unsigned int num_to_delete = el->num_values;
 	uint32_t rmd_flags;
-	const struct GUID *invocation_id;
 	NTTIME now;
 
 	unix_to_nt_time(&now, t);
 
-	invocation_id = samdb_ntds_invocation_id(ldb);
-	if (!invocation_id) {
-		return LDB_ERR_OPERATIONS_ERROR;
-	}
-
 	if (old_el == NULL || old_el->num_values == 0) {
 		/* there is nothing to delete... */
 		if (num_to_delete == 0) {
@@ -2714,7 +2805,7 @@ static int replmd_modify_la_delete(struct ldb_module *module,
 				}
 			}
 			ret = replmd_add_backlink(module, replmd_private,
-						  schema, msg_dn, &p->guid,
+						  ac->schema, msg_dn, &p->guid,
 						  false, schema_attr,
 						  parent);
 			if (ret != LDB_SUCCESS) {
@@ -2732,8 +2823,9 @@ static int replmd_modify_la_delete(struct ldb_module *module,
 
 			ret = replmd_update_la_val(old_el->values, p->v,
 						   p->dsdb_dn, p->dsdb_dn,
-						   invocation_id, seq_num,
-						   seq_num, now, true);
+						   &ac->our_invocation_id,
+						   ac->seq_num, ac->seq_num,
+						   now, true);
 			if (ret != LDB_SUCCESS) {
 				talloc_free(tmp_ctx);
 				return ret;
@@ -2795,7 +2887,7 @@ static int replmd_modify_la_delete(struct ldb_module *module,
 			/* remove the backlink */
 			ret = replmd_add_backlink(module,
 						  replmd_private,
-						  schema, 
+						  ac->schema,
 						  msg_dn,
 						  &p->guid,
 						  false, schema_attr,
@@ -2829,14 +2921,15 @@ static int replmd_modify_la_delete(struct ldb_module *module,
 
 		ret = replmd_update_la_val(old_el->values, exact->v,
 					   exact->dsdb_dn, exact->dsdb_dn,
-					   invocation_id, seq_num, seq_num,
+					   &ac->our_invocation_id,
+					   ac->seq_num, ac->seq_num,
 					   now, true);
 		if (ret != LDB_SUCCESS) {
 			talloc_free(tmp_ctx);
 			return ret;
 		}
 		ret = replmd_add_backlink(module, replmd_private,
-					  schema, msg_dn,
+					  ac->schema, msg_dn,
 					  &p->guid,
 					  false, schema_attr,
 					  parent);
@@ -2886,12 +2979,11 @@ static int replmd_modify_la_delete(struct ldb_module *module,
  */
 static int replmd_modify_la_replace(struct ldb_module *module,
 				    struct replmd_private *replmd_private,
-				    const struct dsdb_schema *schema,
+				    struct replmd_replicated_request *ac,
 				    struct ldb_message *msg,
 				    struct ldb_message_element *el,
 				    struct ldb_message_element *old_el,
 				    const struct dsdb_attribute *schema_attr,
-				    uint64_t seq_num,
 				    time_t t,
 				    struct ldb_dn *msg_dn,
 				    struct ldb_request *parent)
@@ -2900,7 +2992,6 @@ static int replmd_modify_la_replace(struct ldb_module *module,
 	struct parsed_dn *dns, *old_dns;
 	TALLOC_CTX *tmp_ctx = talloc_new(msg);
 	int ret;
-	const struct GUID *invocation_id;
 	struct ldb_context *ldb = ldb_module_get_ctx(module);
 	struct ldb_val *new_values = NULL;
 	const char *ldap_oid = schema_attr->syntax->ldap_oid;
@@ -2911,11 +3002,6 @@ static int replmd_modify_la_replace(struct ldb_module *module,
 
 	unix_to_nt_time(&now, t);
 
-	invocation_id = samdb_ntds_invocation_id(ldb);
-	if (!invocation_id) {
-		return LDB_ERR_OPERATIONS_ERROR;
-	}
-
 	/*
 	 * The replace operation is unlike the replace and delete cases in that
 	 * we need to look at every existing link to see whether it is being
@@ -3015,8 +3101,8 @@ static int replmd_modify_la_replace(struct ldb_module *module,
 				ret = replmd_update_la_val(new_values, old_p->v,
 							   old_p->dsdb_dn,
 							   old_p->dsdb_dn,
-							   invocation_id,
-							   seq_num, seq_num,
+							   &ac->our_invocation_id,
+							   ac->seq_num, ac->seq_num,
 							   now, true);
 				if (ret != LDB_SUCCESS) {
 					talloc_free(tmp_ctx);
@@ -3024,7 +3110,7 @@ static int replmd_modify_la_replace(struct ldb_module *module,
 				}
 
 				ret = replmd_add_backlink(module, replmd_private,
-							  schema, 
+							  ac->schema,
 							  msg_dn,
 							  &old_p->guid, false,
 							  schema_attr,
@@ -3049,8 +3135,8 @@ static int replmd_modify_la_replace(struct ldb_module *module,
 			ret = replmd_update_la_val(new_values, old_p->v,
 						   new_p->dsdb_dn,
 						   old_p->dsdb_dn,
-						   invocation_id,
-						   seq_num, seq_num,
+						   &ac->our_invocation_id,
+						   ac->seq_num, ac->seq_num,
 						   now, false);
 			if (ret != LDB_SUCCESS) {
 				talloc_free(tmp_ctx);
@@ -3060,7 +3146,7 @@ static int replmd_modify_la_replace(struct ldb_module *module,
 			rmd_flags = dsdb_dn_rmd_flags(old_p->dsdb_dn->dn);
 			if ((rmd_flags & DSDB_RMD_FLAG_DELETED) != 0) {
 				ret = replmd_add_backlink(module, replmd_private,
-							  schema, 
+							  ac->schema,
 							  msg_dn,
 							  &new_p->guid, true,


-- 
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