s4: implemented server side of DSUpdateRefs call

This call is made by DCs to tell us we should notify them of directory
changes

4 files changed, 337 insertions, 10 deletions

diff --git a/source4/rpc_server/drsuapi/dcesrv_drsuapi.c b/source4/rpc_server/drsuapi/dcesrv_drsuapi.c
index 1473da0ee1..30096f199e 100644
--- a/source4/rpc_server/drsuapi/dcesrv_drsuapi.c
+++ b/source4/rpc_server/drsuapi/dcesrv_drsuapi.c
@@ -350,6 +350,9 @@ static WERROR dcesrv_drsuapi_DsGetNCChanges(struct dcesrv_call_state *dce_call,
 		return WERR_DS_DRA_BAD_NC;
 	}
 
+	DEBUG(4,("DsGetNSChanges with uSHChanged >= %llu\n", 
+		 (unsigned long long)r->in.req->req8.highwatermark.highest_usn));
+
 	/* Construct response. */
 	ncRoot_dn = ldb_dn_new(mem_ctx, b_state->sam_ctx, ncRoot->dn);
 	ret = drsuapi_search_with_extended_dn(b_state->sam_ctx, mem_ctx, &site_res,
@@ -479,16 +482,6 @@ static WERROR dcesrv_drsuapi_DsGetNCChanges(struct dcesrv_call_state *dce_call,
 
 
 /* 
-  drsuapi_DsReplicaUpdateRefs
-*/
-static WERROR dcesrv_drsuapi_DsReplicaUpdateRefs(struct dcesrv_call_state *dce_call, TALLOC_CTX *mem_ctx,
-		       struct drsuapi_DsReplicaUpdateRefs *r)
-{
-	DCESRV_FAULT(DCERPC_FAULT_OP_RNG_ERROR);
-}
-
-
-/* 
   DRSUAPI_REPLICA_ADD 
 */
 static WERROR dcesrv_DRSUAPI_REPLICA_ADD(struct dcesrv_call_state *dce_call, TALLOC_CTX *mem_ctx,
diff --git a/source4/rpc_server/drsuapi/dcesrv_drsuapi.h b/source4/rpc_server/drsuapi/dcesrv_drsuapi.h
index 7412865449..a53c47f409 100644
--- a/source4/rpc_server/drsuapi/dcesrv_drsuapi.h
+++ b/source4/rpc_server/drsuapi/dcesrv_drsuapi.h
@@ -35,3 +35,12 @@ struct drsuapi_bind_state {
 	struct drsuapi_DsBindInfo28 remote_info28;
 	struct drsuapi_DsBindInfo28 local_info28;
 };
+
+
+/* prototypes of internal functions */
+WERROR dcesrv_drsuapi_DsReplicaUpdateRefs(struct dcesrv_call_state *dce_call, TALLOC_CTX *mem_ctx,
+					  struct drsuapi_DsReplicaUpdateRefs *r);
+
+char *drs_ObjectIdentifier_to_string(TALLOC_CTX *mem_ctx,
+				     struct drsuapi_DsReplicaObjectIdentifier *nc);
+
diff --git a/source4/rpc_server/drsuapi/drsutil.c b/source4/rpc_server/drsuapi/drsutil.c
new file mode 100644
index 0000000000..f14c072c59
--- /dev/null
+++ b/source4/rpc_server/drsuapi/drsutil.c
@@ -0,0 +1,47 @@
+/* 
+   Unix SMB/CIFS implementation.
+
+   useful utilities for the DRS server
+
+   Copyright (C) Andrew Tridgell 2009
+   
+   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 "librpc/gen_ndr/ndr_drsuapi.h"
+#include "rpc_server/dcerpc_server.h"
+#include "rpc_server/common/common.h"
+#include "rpc_server/drsuapi/dcesrv_drsuapi.h"
+#include "dsdb/samdb/samdb.h"
+#include "lib/ldb/include/ldb_errors.h"
+#include "param/param.h"
+#include "librpc/gen_ndr/ndr_drsblobs.h"
+#include "libcli/security/dom_sid.h"
+
+/*
+  format a drsuapi_DsReplicaObjectIdentifier naming context as a string
+ */
+char *drs_ObjectIdentifier_to_string(TALLOC_CTX *mem_ctx,
+				     struct drsuapi_DsReplicaObjectIdentifier *nc)
+{
+	char *guid, *sid, *ret;
+	guid = GUID_string(mem_ctx, &nc->guid);
+	sid  = dom_sid_string(mem_ctx, &nc->sid);
+	ret = talloc_asprintf(mem_ctx, "<GUID=%s>;<SID=%s>;%s",
+			      guid, sid, nc->dn);
+	talloc_free(guid);
+	talloc_free(sid);
+	return ret;
+}
diff --git a/source4/rpc_server/drsuapi/updaterefs.c b/source4/rpc_server/drsuapi/updaterefs.c
new file mode 100644
index 0000000000..5bf2f2251f
--- /dev/null
+++ b/source4/rpc_server/drsuapi/updaterefs.c
@@ -0,0 +1,278 @@
+/* 
+   Unix SMB/CIFS implementation.
+
+   implement the DRSUpdateRefs call
+
+   Copyright (C) Andrew Tridgell 2009
+   
+   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 "librpc/gen_ndr/ndr_drsuapi.h"
+#include "rpc_server/dcerpc_server.h"
+#include "rpc_server/common/common.h"
+#include "rpc_server/drsuapi/dcesrv_drsuapi.h"
+#include "dsdb/samdb/samdb.h"
+#include "lib/ldb/include/ldb_errors.h"
+#include "param/param.h"
+#include "librpc/gen_ndr/ndr_drsblobs.h"
+#include "auth/auth.h"
+
+/*
+  load the repsTo structure for a given partition GUID
+ */
+static WERROR uref_loadreps(struct ldb_context *sam_ctx, TALLOC_CTX *mem_ctx, struct GUID *guid,
+			    struct repsTo *reps)
+{
+	struct ldb_dn *dn;
+	const char *attrs[] = { "repsTo", NULL };
+	struct ldb_result *res;
+	const struct ldb_val *v;
+	TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);
+
+	if (dsdb_find_dn_by_guid(sam_ctx, tmp_ctx, GUID_string(tmp_ctx, guid), &dn) != LDB_SUCCESS) {
+		DEBUG(0,("drsuapi_addref: failed to find partition with GUID %s\n",
+			 GUID_string(tmp_ctx, guid)));
+		talloc_free(tmp_ctx);
+		return WERR_DS_DRA_BAD_NC;
+	}
+
+	/* TODO: possibly check in the rootDSE to see that this DN is
+	 * one of our partition roots */	 
+
+	if (ldb_search(sam_ctx, tmp_ctx, &res, dn, LDB_SCOPE_BASE, attrs, NULL) != LDB_SUCCESS) {
+		DEBUG(0,("drsuapi_addref: failed to read partition object\n"));
+		talloc_free(tmp_ctx);
+		return WERR_DS_DRA_INTERNAL_ERROR;
+	}
+
+	v = ldb_msg_find_ldb_val(res->msgs[0], "repsTo");
+	if (v == NULL) {
+		/* treat as empty empty */
+		ZERO_STRUCTP(reps);
+		reps->version = REPSTO_VERSION1;
+	} else {
+		enum ndr_err_code ndr_err;
+		ndr_err = ndr_pull_struct_blob(v, mem_ctx, lp_iconv_convenience(ldb_get_opaque(sam_ctx, "loadparm")),
+					       reps, 
+					       (ndr_pull_flags_fn_t)ndr_pull_repsTo);
+		if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
+			talloc_free(tmp_ctx);
+			return WERR_DS_DRA_INTERNAL_ERROR;
+		}
+	}
+
+	talloc_free(tmp_ctx);
+	
+	return WERR_OK;
+}
+
+/*
+  save the repsTo structure for a given partition GUID
+ */
+static WERROR uref_savereps(struct ldb_context *sam_ctx, TALLOC_CTX *mem_ctx, struct GUID *guid,
+			    struct repsTo *reps)
+{
+	struct ldb_dn *dn;
+	struct ldb_val v;
+	TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);
+	enum ndr_err_code ndr_err;
+	struct ldb_message *msg;
+	struct ldb_message_element *el;
+
+	if (dsdb_find_dn_by_guid(sam_ctx, tmp_ctx, GUID_string(tmp_ctx, guid), &dn) != LDB_SUCCESS) {
+		DEBUG(0,("drsuapi_addref: failed to find partition with GUID %s\n",
+			 GUID_string(tmp_ctx, guid)));
+		talloc_free(tmp_ctx);
+		return WERR_DS_DRA_BAD_NC;
+	}
+
+	ndr_err = ndr_push_struct_blob(&v, tmp_ctx, lp_iconv_convenience(ldb_get_opaque(sam_ctx, "loadparm")),
+				       reps, 
+				       (ndr_push_flags_fn_t)ndr_push_repsTo);
+	if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
+		goto failed;
+	}
+
+	msg = ldb_msg_new(tmp_ctx);
+	msg->dn = dn;
+	if (ldb_msg_add_empty(msg, "repsTo", LDB_FLAG_MOD_REPLACE, &el) != LDB_SUCCESS) {
+		goto failed;
+	}
+	el->num_values = 1;
+	el->values = &v;
+
+	if (ldb_modify(sam_ctx, msg) != LDB_SUCCESS) {
+		DEBUG(0,("Failed to store repsTo - %s\n", ldb_errstring(sam_ctx)));
+		goto failed;
+	}
+
+	talloc_free(tmp_ctx);
+	
+	return WERR_OK;
+
+failed:
+	talloc_free(tmp_ctx);
+	return WERR_DS_DRA_INTERNAL_ERROR;
+}
+
+/*
+  add a replication destination for a given partition GUID
+ */
+static WERROR uref_add_dest(struct ldb_context *sam_ctx, TALLOC_CTX *mem_ctx, 
+			    struct GUID *guid, struct repsToDest *dest)
+{
+	struct repsTo reps;
+	WERROR werr;
+	struct repsTov1 *rv1;
+
+	werr = uref_loadreps(sam_ctx, mem_ctx, guid, &reps);
+	if (!W_ERROR_IS_OK(werr)) {
+		return werr;
+	}
+
+	if (reps.version != REPSTO_VERSION1) {
+		DEBUG(0,("Wrong version number %u on disk\n",
+			 reps.version));
+		return WERR_DS_DRA_INTERNAL_ERROR;
+	}
+
+	rv1 = &reps.ctr.r;
+	rv1->reps = talloc_realloc(mem_ctx, rv1->reps, struct repsToDest, rv1->count+1);
+	if (rv1->reps == NULL) {
+		return WERR_DS_DRA_INTERNAL_ERROR;
+	}
+	rv1->reps[rv1->count] = *dest;
+	rv1->count++;
+
+	werr = uref_savereps(sam_ctx, mem_ctx, guid, &reps);
+	if (!W_ERROR_IS_OK(werr)) {
+		return werr;
+	}
+
+	return WERR_OK;	
+}
+
+/*
+  delete a replication destination for a given partition GUID
+ */
+static WERROR uref_del_dest(struct ldb_context *sam_ctx, TALLOC_CTX *mem_ctx, 
+			    struct GUID *guid, struct GUID *dest_guid)
+{
+	struct repsTo reps;
+	WERROR werr;
+	struct repsTov1 *rv1;
+	int i;
+
+	werr = uref_loadreps(sam_ctx, mem_ctx, guid, &reps);
+	if (!W_ERROR_IS_OK(werr)) {
+		return werr;
+	}
+
+	if (reps.version != REPSTO_VERSION1) {
+		DEBUG(0,("Wrong version number %u on disk\n", reps.version));
+		return WERR_DS_DRA_INTERNAL_ERROR;
+	}
+
+	rv1 = &reps.ctr.r;
+
+	for (i=0; i<rv1->count; i++) {
+		if (GUID_compare(dest_guid, &rv1->reps[i].dest_guid) == 0) {
+			if (i+1 < rv1->count) {
+				memmove(&rv1->reps[i], &rv1->reps[i+1], sizeof(rv1->reps[i])*(rv1->count-(i+1)));
+			}
+			rv1->count--;
+		}
+	}
+
+	werr = uref_savereps(sam_ctx, mem_ctx, guid, &reps);
+	if (!W_ERROR_IS_OK(werr)) {
+		return werr;
+	}
+
+	return WERR_OK;	
+}
+
+/* 
+  drsuapi_DsReplicaUpdateRefs
+*/
+WERROR dcesrv_drsuapi_DsReplicaUpdateRefs(struct dcesrv_call_state *dce_call, TALLOC_CTX *mem_ctx,
+					  struct drsuapi_DsReplicaUpdateRefs *r)
+{
+	struct drsuapi_DsReplicaUpdateRefsRequest1 *req;
+	struct ldb_context *sam_ctx;
+	WERROR werr;
+
+	if (r->in.level != 1) {
+		DEBUG(0,("DrReplicUpdateRefs - unsupported level %u\n", r->in.level));
+		return WERR_DS_DRA_INVALID_PARAMETER;
+	}
+
+	req = &r->in.req.req1;
+	DEBUG(4,("DrReplicUpdateRefs for host '%s' with GUID %s options 0x%08x nc=%s\n",
+		 req->dest_dsa_dns_name, GUID_string(mem_ctx, &req->dest_dsa_guid),
+		 req->options,
+		 drs_ObjectIdentifier_to_string(mem_ctx, req->naming_context)));
+
+	/* TODO: We need to authenticate this operation pretty carefully */
+	sam_ctx = samdb_connect(mem_ctx, dce_call->event_ctx, dce_call->conn->dce_ctx->lp_ctx, 
+				system_session(mem_ctx, dce_call->conn->dce_ctx->lp_ctx));
+	if (!sam_ctx) {
+		return WERR_DS_DRA_INTERNAL_ERROR;		
+	}
+
+	if (ldb_transaction_start(sam_ctx) != LDB_SUCCESS) {
+		DEBUG(0,(__location__ ": Failed to start transaction on samdb\n"));
+		return WERR_DS_DRA_INTERNAL_ERROR;		
+	}
+
+	if (req->options & DRSUAPI_DS_REPLICA_UPDATE_DELETE_REFERENCE) {
+		werr = uref_del_dest(sam_ctx, mem_ctx, &req->naming_context->guid, &req->dest_dsa_guid);
+		if (!W_ERROR_IS_OK(werr)) {
+			DEBUG(0,("Failed to delete repsTo for %s\n",
+				 GUID_string(dce_call, &req->dest_dsa_guid)));
+			goto failed;
+		}
+	}
+
+	if (req->options & DRSUAPI_DS_REPLICA_UPDATE_ADD_REFERENCE) {
+		struct repsToDest dest;
+
+		dest.dest_dsa_dns_name = req->dest_dsa_dns_name;
+		dest.dest_guid         = req->dest_dsa_guid;
+		dest.options           = req->options;
+
+		werr = uref_add_dest(sam_ctx, mem_ctx, &req->naming_context->guid, &dest);
+		if (!W_ERROR_IS_OK(werr)) {
+			DEBUG(0,("Failed to delete repsTo for %s\n",
+				 GUID_string(dce_call, &dest.dest_guid)));
+			goto failed;
+		}
+	}
+
+	if (ldb_transaction_commit(sam_ctx) != LDB_SUCCESS) {
+		DEBUG(0,(__location__ ": Failed to commit transaction on samdb\n"));
+		return WERR_DS_DRA_INTERNAL_ERROR;		
+	}
+
+	talloc_free(sam_ctx);
+	return WERR_OK;
+
+failed:
+	ldb_transaction_cancel(sam_ctx);
+	talloc_free(sam_ctx);
+	return werr;
+}
+