/*
Unix SMB/CIFS implementation.
implement the DSGetNCChanges call
Copyright (C) Anatoliy Atanasov 2009
Copyright (C) Andrew Tridgell 2009-2010
Copyright (C) Andrew Bartlett 2010-2016
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 .
*/
#include "includes.h"
#include "rpc_server/dcerpc_server.h"
#include "dsdb/samdb/samdb.h"
#include "param/param.h"
#include "librpc/gen_ndr/ndr_drsblobs.h"
#include "librpc/gen_ndr/ndr_drsuapi.h"
#include "librpc/gen_ndr/ndr_security.h"
#include "libcli/security/security.h"
#include "libcli/security/session.h"
#include "rpc_server/drsuapi/dcesrv_drsuapi.h"
#include "../libcli/drsuapi/drsuapi.h"
#include "lib/util/binsearch.h"
#include "lib/util/tsort.h"
#include "auth/session.h"
#include "dsdb/common/util.h"
#include "lib/dbwrap/dbwrap.h"
#include "lib/dbwrap/dbwrap_rbt.h"
#include "librpc/gen_ndr/ndr_misc.h"
#undef DBGC_CLASS
#define DBGC_CLASS DBGC_DRS_REPL
#define DRS_GUID_SIZE 16
#define DEFAULT_MAX_OBJECTS 1000
#define DEFAULT_MAX_LINKS 1500
/*
* state of a partially-completed replication cycle. This state persists
* over multiple calls to dcesrv_drsuapi_DsGetNCChanges()
*/
struct drsuapi_getncchanges_state {
struct db_context *obj_cache;
struct GUID *guids;
uint32_t num_records;
uint32_t num_processed;
struct ldb_dn *ncRoot_dn;
struct GUID ncRoot_guid;
bool is_schema_nc;
bool is_get_anc;
bool broken_samba_4_5_get_anc_emulation;
bool is_get_tgt;
bool send_nc_root_first;
uint64_t min_usn;
uint64_t max_usn;
struct drsuapi_DsReplicaHighWaterMark last_hwm;
struct ldb_dn *last_dn;
struct drsuapi_DsReplicaHighWaterMark final_hwm;
struct drsuapi_DsReplicaCursor2CtrEx *final_udv;
struct drsuapi_DsReplicaLinkedAttribute *la_list;
uint32_t la_count;
uint32_t la_idx;
/* these are just used for debugging the replication's progress */
uint32_t links_given;
uint32_t total_links;
};
/* We must keep the GUIDs in NDR form for sorting */
struct la_for_sorting {
const struct drsuapi_DsReplicaLinkedAttribute *link;
uint8_t target_guid[DRS_GUID_SIZE];
uint8_t source_guid[DRS_GUID_SIZE];
};
/*
* stores the state for a chunk of replication data. This state information
* only exists for a single call to dcesrv_drsuapi_DsGetNCChanges()
*/
struct getncchanges_repl_chunk {
uint32_t max_objects;
uint32_t max_links;
uint32_t tgt_la_count;
bool immediate_link_sync;
time_t max_wait;
time_t start;
/* stores the objects to be sent in this chunk */
uint32_t object_count;
struct drsuapi_DsReplicaObjectListItemEx *object_list;
/* the last object added to this replication chunk */
struct drsuapi_DsReplicaObjectListItemEx *last_object;
};
static int drsuapi_DsReplicaHighWaterMark_cmp(const struct drsuapi_DsReplicaHighWaterMark *h1,
const struct drsuapi_DsReplicaHighWaterMark *h2)
{
if (h1->highest_usn < h2->highest_usn) {
return -1;
} else if (h1->highest_usn > h2->highest_usn) {
return 1;
} else if (h1->tmp_highest_usn < h2->tmp_highest_usn) {
return -1;
} else if (h1->tmp_highest_usn > h2->tmp_highest_usn) {
return 1;
} else if (h1->reserved_usn < h2->reserved_usn) {
return -1;
} else if (h1->reserved_usn > h2->reserved_usn) {
return 1;
}
return 0;
}
/*
build a DsReplicaObjectIdentifier from a ldb msg
*/
static struct drsuapi_DsReplicaObjectIdentifier *get_object_identifier(TALLOC_CTX *mem_ctx,
const struct ldb_message *msg)
{
struct drsuapi_DsReplicaObjectIdentifier *identifier;
struct dom_sid *sid;
identifier = talloc(mem_ctx, struct drsuapi_DsReplicaObjectIdentifier);
if (identifier == NULL) {
return NULL;
}
identifier->dn = ldb_dn_alloc_linearized(identifier, msg->dn);
identifier->guid = samdb_result_guid(msg, "objectGUID");
sid = samdb_result_dom_sid(identifier, msg, "objectSid");
if (sid) {
identifier->sid = *sid;
} else {
ZERO_STRUCT(identifier->sid);
}
return identifier;
}
static int udv_compare(const struct GUID *guid1, struct GUID guid2)
{
return GUID_compare(guid1, &guid2);
}
/*
see if we can filter an attribute using the uptodateness_vector
*/
static bool udv_filter(const struct drsuapi_DsReplicaCursorCtrEx *udv,
const struct GUID *originating_invocation_id,
uint64_t originating_usn)
{
const struct drsuapi_DsReplicaCursor *c;
if (udv == NULL) return false;
BINARY_ARRAY_SEARCH(udv->cursors, udv->count, source_dsa_invocation_id,
originating_invocation_id, udv_compare, c);
if (c && originating_usn <= c->highest_usn) {
return true;
}
return false;
}
static int uint32_t_cmp(uint32_t a1, uint32_t a2)
{
if (a1 == a2) return 0;
return a1 > a2 ? 1 : -1;
}
static int uint32_t_ptr_cmp(uint32_t *a1, uint32_t *a2)
{
if (*a1 == *a2) return 0;
return *a1 > *a2 ? 1 : -1;
}
static WERROR getncchanges_attid_remote_to_local(const struct dsdb_schema *schema,
const struct dsdb_syntax_ctx *ctx,
enum drsuapi_DsAttributeId remote_attid_as_enum,
enum drsuapi_DsAttributeId *local_attid_as_enum,
const struct dsdb_attribute **_sa)
{
WERROR werr;
const struct dsdb_attribute *sa = NULL;
if (ctx->pfm_remote == NULL) {
DEBUG(7, ("No prefixMap supplied, falling back to local prefixMap.\n"));
goto fail;
}
werr = dsdb_attribute_drsuapi_remote_to_local(ctx,
remote_attid_as_enum,
local_attid_as_enum,
_sa);
if (!W_ERROR_IS_OK(werr)) {
DEBUG(3, ("WARNING: Unable to resolve remote attid, falling back to local prefixMap.\n"));
goto fail;
}
return werr;
fail:
sa = dsdb_attribute_by_attributeID_id(schema, remote_attid_as_enum);
if (sa == NULL) {
return WERR_DS_DRA_SCHEMA_MISMATCH;
} else {
if (local_attid_as_enum != NULL) {
*local_attid_as_enum = sa->attributeID_id;
}
if (_sa != NULL) {
*_sa = sa;
}
return WERR_OK;
}
}
static WERROR getncchanges_update_revealed_list(struct ldb_context *sam_ctx,
TALLOC_CTX *mem_ctx,
struct ldb_message **msg,
struct ldb_dn *object_dn,
const struct GUID *object_guid,
const struct dsdb_attribute *sa,
struct replPropertyMetaData1 *meta_data,
struct ldb_message *revealed_users)
{
enum ndr_err_code ndr_err;
int ldb_err;
char *attr_str = NULL;
char *attr_hex = NULL;
DATA_BLOB attr_blob;
struct ldb_message_element *existing = NULL, *el_add = NULL, *el_del = NULL;
const char * const * secret_attributes = ldb_get_opaque(sam_ctx, "LDB_SECRET_ATTRIBUTE_LIST");
if (!ldb_attr_in_list(secret_attributes,
sa->lDAPDisplayName)) {
return WERR_OK;
}
ndr_err = ndr_push_struct_blob(&attr_blob, mem_ctx, meta_data, (ndr_push_flags_fn_t)ndr_push_replPropertyMetaData1);
if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
return WERR_DS_DRA_INTERNAL_ERROR;
}
attr_hex = hex_encode_talloc(mem_ctx, attr_blob.data, attr_blob.length);
if (attr_hex == NULL) {
return WERR_NOT_ENOUGH_MEMORY;
}
attr_str = talloc_asprintf(mem_ctx, "B:%zd:%s:%s", attr_blob.length*2, attr_hex, ldb_dn_get_linearized(object_dn));
if (attr_str == NULL) {
return WERR_NOT_ENOUGH_MEMORY;
}
existing = ldb_msg_find_element(revealed_users, "msDS-RevealedUsers");
if (existing != NULL) {
/* Replace the old value (if one exists) with the current one */
struct parsed_dn *link_dns;
struct parsed_dn *exact = NULL, *unused = NULL;
uint8_t attid[4];
DATA_BLOB partial_meta;
ldb_err = get_parsed_dns_trusted(mem_ctx, existing, &link_dns);
if (ldb_err != LDB_SUCCESS) {
return WERR_DS_DRA_INTERNAL_ERROR;
}
/* Construct a partial metadata blob to match on in the DB */
SIVAL(attid, 0, sa->attributeID_id);
partial_meta.length = 4;
partial_meta.data = attid;
/* Binary search using GUID and attribute id for uniqueness */
ldb_err = parsed_dn_find(sam_ctx, link_dns, existing->num_values,
object_guid, object_dn,
partial_meta, 4,
&exact, &unused,
DSDB_SYNTAX_BINARY_DN, true);
if (ldb_err != LDB_SUCCESS) {
DEBUG(0,(__location__ ": Failed parsed DN find - %s\n",
ldb_errstring(sam_ctx)));
return WERR_DS_DRA_INTERNAL_ERROR;
}
if (exact != NULL) {
/* Perform some verification of the blob */
struct replPropertyMetaData1 existing_meta_data;
ndr_err = ndr_pull_struct_blob_all_noalloc(&exact->dsdb_dn->extra_part,
&existing_meta_data,
(ndr_pull_flags_fn_t)ndr_pull_replPropertyMetaData1);
if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
return WERR_DS_DRA_INTERNAL_ERROR;
}
if (existing_meta_data.attid == sa->attributeID_id) {
ldb_err = ldb_msg_add_empty(*msg, "msDS-RevealedUsers", LDB_FLAG_MOD_DELETE, &el_del);
if (ldb_err != LDB_SUCCESS) {
return WERR_DS_DRA_INTERNAL_ERROR;
}
el_del->values = talloc_array((*msg)->elements, struct ldb_val, 1);
if (el_del->values == NULL) {
return WERR_NOT_ENOUGH_MEMORY;
}
el_del->values[0] = *exact->v;
el_del->num_values = 1;
} else {
return WERR_DS_DRA_INTERNAL_ERROR;
}
}
}
ldb_err = ldb_msg_add_empty(*msg, "msDS-RevealedUsers", LDB_FLAG_MOD_ADD, &el_add);
if (ldb_err != LDB_SUCCESS) {
return WERR_DS_DRA_INTERNAL_ERROR;
}
el_add->values = talloc_array((*msg)->elements, struct ldb_val, 1);
if (el_add->values == NULL) {
return WERR_NOT_ENOUGH_MEMORY;
}
el_add->values[0] = data_blob_string_const(attr_str);
el_add->num_values = 1;
return WERR_OK;
}
/*
* This function filter attributes for build_object based on the
* uptodatenessvector and partial attribute set.
*
* Any secret attributes are forced here for REPL_SECRET, and audited at this
* point with msDS-RevealedUsers.
*/
static WERROR get_nc_changes_filter_attrs(struct drsuapi_DsReplicaObjectListItemEx *obj,
struct replPropertyMetaDataBlob md,
struct ldb_context *sam_ctx,
const struct ldb_message *msg,
const struct GUID *guid,
uint32_t *count,
uint64_t highest_usn,
const struct dsdb_attribute *rdn_sa,
struct dsdb_schema *schema,
struct drsuapi_DsReplicaCursorCtrEx *uptodateness_vector,
struct drsuapi_DsPartialAttributeSet *partial_attribute_set,
uint32_t *local_pas,
uint32_t *attids,
bool exop_secret,
struct ldb_message **revealed_list_msg,
struct ldb_message *existing_revealed_list_msg)
{
uint32_t i, n;
WERROR werr;
for (n=i=0; iattributeID_id) continue;
sa = dsdb_attribute_by_attributeID_id(schema, md.ctr.ctr1.array[i].attid);
if (!sa) {
DEBUG(0,(__location__ ": Failed to find attribute in schema for attrid %u mentioned in replPropertyMetaData of %s\n",
(unsigned int)md.ctr.ctr1.array[i].attid,
ldb_dn_get_linearized(msg->dn)));
return WERR_DS_DRA_INTERNAL_ERROR;
}
if (sa->linkID) {
struct ldb_message_element *el;
el = ldb_msg_find_element(msg, sa->lDAPDisplayName);
if (el && el->num_values && dsdb_dn_is_upgraded_link_val(&el->values[0])) {
/* don't send upgraded links inline */
continue;
}
}
if (exop_secret &&
!dsdb_attr_in_rodc_fas(sa)) {
force_attribute = true;
DEBUG(4,("Forcing attribute %s in %s\n",
sa->lDAPDisplayName, ldb_dn_get_linearized(msg->dn)));
werr = getncchanges_update_revealed_list(sam_ctx, obj,
revealed_list_msg,
msg->dn, guid, sa,
&md.ctr.ctr1.array[i],
existing_revealed_list_msg);
if (!W_ERROR_IS_OK(werr)) {
return werr;
}
}
/* filter by uptodateness_vector */
if (md.ctr.ctr1.array[i].attid != DRSUAPI_ATTID_instanceType &&
!force_attribute &&
udv_filter(uptodateness_vector,
&md.ctr.ctr1.array[i].originating_invocation_id,
md.ctr.ctr1.array[i].originating_usn)) {
continue;
}
/* filter by partial_attribute_set */
if (partial_attribute_set && !force_attribute) {
uint32_t *result = NULL;
BINARY_ARRAY_SEARCH_V(local_pas, partial_attribute_set->num_attids, sa->attributeID_id,
uint32_t_cmp, result);
if (result == NULL) {
continue;
}
}
obj->meta_data_ctr->meta_data[n].originating_change_time = md.ctr.ctr1.array[i].originating_change_time;
obj->meta_data_ctr->meta_data[n].version = md.ctr.ctr1.array[i].version;
obj->meta_data_ctr->meta_data[n].originating_invocation_id = md.ctr.ctr1.array[i].originating_invocation_id;
obj->meta_data_ctr->meta_data[n].originating_usn = md.ctr.ctr1.array[i].originating_usn;
attids[n] = md.ctr.ctr1.array[i].attid;
n++;
}
*count = n;
return WERR_OK;
}
/*
drsuapi_DsGetNCChanges for one object
*/
static WERROR get_nc_changes_build_object(struct drsuapi_DsReplicaObjectListItemEx *obj,
const struct ldb_message *msg,
struct ldb_context *sam_ctx,
struct drsuapi_getncchanges_state *getnc_state,
struct dsdb_schema *schema,
DATA_BLOB *session_key,
struct drsuapi_DsGetNCChangesRequest10 *req10,
bool force_object_return,
uint32_t *local_pas,
struct ldb_dn *machine_dn,
const struct GUID *guid)
{
const struct ldb_val *md_value;
uint32_t i, n;
struct replPropertyMetaDataBlob md;
uint32_t rid = 0;
int ldb_err;
enum ndr_err_code ndr_err;
uint32_t *attids;
const char *rdn;
const struct dsdb_attribute *rdn_sa;
uint64_t uSNChanged;
unsigned int instanceType;
struct dsdb_syntax_ctx syntax_ctx;
struct ldb_result *res = NULL;
WERROR werr;
int ret;
uint32_t replica_flags = req10->replica_flags;
struct drsuapi_DsPartialAttributeSet *partial_attribute_set =
req10->partial_attribute_set;
struct drsuapi_DsReplicaCursorCtrEx *uptodateness_vector =
req10->uptodateness_vector;
enum drsuapi_DsExtendedOperation extended_op = req10->extended_op;
bool is_schema_nc = getnc_state->is_schema_nc;
uint64_t highest_usn = getnc_state->min_usn;
/* make dsdb syntax context for conversions */
dsdb_syntax_ctx_init(&syntax_ctx, sam_ctx, schema);
syntax_ctx.is_schema_nc = is_schema_nc;
uSNChanged = ldb_msg_find_attr_as_uint64(msg, "uSNChanged", 0);
instanceType = ldb_msg_find_attr_as_uint(msg, "instanceType", 0);
if (instanceType & INSTANCE_TYPE_IS_NC_HEAD) {
obj->is_nc_prefix = true;
obj->parent_object_guid = NULL;
} else {
obj->is_nc_prefix = false;
obj->parent_object_guid = talloc(obj, struct GUID);
if (obj->parent_object_guid == NULL) {
return WERR_DS_DRA_INTERNAL_ERROR;
}
*obj->parent_object_guid = samdb_result_guid(msg, "parentGUID");
if (GUID_all_zero(obj->parent_object_guid)) {
DEBUG(0,(__location__ ": missing parentGUID for %s\n",
ldb_dn_get_linearized(msg->dn)));
return WERR_DS_DRA_INTERNAL_ERROR;
}
}
obj->next_object = NULL;
md_value = ldb_msg_find_ldb_val(msg, "replPropertyMetaData");
if (!md_value) {
/* nothing to send */
return WERR_OK;
}
if (instanceType & INSTANCE_TYPE_UNINSTANT) {
/* don't send uninstantiated objects */
return WERR_OK;
}
if (uSNChanged <= highest_usn) {
/* nothing to send */
return WERR_OK;
}
ndr_err = ndr_pull_struct_blob(md_value, obj, &md,
(ndr_pull_flags_fn_t)ndr_pull_replPropertyMetaDataBlob);
if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
return WERR_DS_DRA_INTERNAL_ERROR;
}
if (md.version != 1) {
return WERR_DS_DRA_INTERNAL_ERROR;
}
rdn = ldb_dn_get_rdn_name(msg->dn);
if (rdn == NULL) {
DEBUG(0,(__location__ ": No rDN for %s\n", ldb_dn_get_linearized(msg->dn)));
return WERR_DS_DRA_INTERNAL_ERROR;
}
rdn_sa = dsdb_attribute_by_lDAPDisplayName(schema, rdn);
if (rdn_sa == NULL) {
DEBUG(0,(__location__ ": Can't find dsds_attribute for rDN %s in %s\n",
rdn, ldb_dn_get_linearized(msg->dn)));
return WERR_DS_DRA_INTERNAL_ERROR;
}
obj->meta_data_ctr = talloc(obj, struct drsuapi_DsReplicaMetaDataCtr);
attids = talloc_array(obj, uint32_t, md.ctr.ctr1.count);
obj->object.identifier = get_object_identifier(obj, msg);
if (obj->object.identifier == NULL) {
return WERR_NOT_ENOUGH_MEMORY;
}
dom_sid_split_rid(NULL, &obj->object.identifier->sid, NULL, &rid);
obj->meta_data_ctr->meta_data = talloc_array(obj, struct drsuapi_DsReplicaMetaData, md.ctr.ctr1.count);
if (extended_op == DRSUAPI_EXOP_REPL_SECRET) {
/* Get the existing revealed users for the destination */
struct ldb_message *revealed_list_msg = NULL;
struct ldb_message *existing_revealed_list_msg = NULL;
const char *machine_attrs[] = {
"msDS-RevealedUsers",
NULL
};
revealed_list_msg = ldb_msg_new(sam_ctx);
if (revealed_list_msg == NULL) {
return WERR_NOT_ENOUGH_MEMORY;
}
revealed_list_msg->dn = machine_dn;
ret = ldb_transaction_start(sam_ctx);
if (ret != LDB_SUCCESS) {
DEBUG(0,(__location__ ": Failed transaction start - %s\n",
ldb_errstring(sam_ctx)));
return WERR_DS_DRA_INTERNAL_ERROR;
}
ldb_err = dsdb_search_dn(sam_ctx, obj, &res, machine_dn, machine_attrs, DSDB_SEARCH_SHOW_EXTENDED_DN);
if (ldb_err != LDB_SUCCESS || res->count != 1) {
ldb_transaction_cancel(sam_ctx);
return WERR_DS_DRA_INTERNAL_ERROR;
}
existing_revealed_list_msg = res->msgs[0];
werr = get_nc_changes_filter_attrs(obj, md, sam_ctx, msg,
guid, &n, highest_usn,
rdn_sa, schema,
uptodateness_vector,
partial_attribute_set, local_pas,
attids,
true,
&revealed_list_msg,
existing_revealed_list_msg);
if (!W_ERROR_IS_OK(werr)) {
ldb_transaction_cancel(sam_ctx);
return werr;
}
if (revealed_list_msg != NULL) {
ret = ldb_modify(sam_ctx, revealed_list_msg);
if (ret != LDB_SUCCESS) {
DEBUG(0,(__location__ ": Failed to alter revealed links - %s\n",
ldb_errstring(sam_ctx)));
ldb_transaction_cancel(sam_ctx);
return WERR_DS_DRA_INTERNAL_ERROR;
}
}
ret = ldb_transaction_commit(sam_ctx);
if (ret != LDB_SUCCESS) {
DEBUG(0,(__location__ ": Failed transaction commit - %s\n",
ldb_errstring(sam_ctx)));
return WERR_DS_DRA_INTERNAL_ERROR;
}
} else {
werr = get_nc_changes_filter_attrs(obj, md, sam_ctx, msg, guid,
&n, highest_usn, rdn_sa,
schema, uptodateness_vector,
partial_attribute_set, local_pas,
attids,
false,
NULL,
NULL);
if (!W_ERROR_IS_OK(werr)) {
return werr;
}
}
/* ignore it if its an empty change. Note that renames always
* change the 'name' attribute, so they won't be ignored by
* this
* the force_object_return check is used to force an empty
* object return when we timeout in the getncchanges loop.
* This allows us to return an empty object, which keeps the
* client happy while preventing timeouts
*/
if (n == 0 ||
(n == 1 &&
attids[0] == DRSUAPI_ATTID_instanceType &&
!force_object_return)) {
talloc_free(obj->meta_data_ctr);
obj->meta_data_ctr = NULL;
return WERR_OK;
}
obj->meta_data_ctr->count = n;
obj->object.flags = DRSUAPI_DS_REPLICA_OBJECT_FROM_MASTER;
obj->object.attribute_ctr.num_attributes = obj->meta_data_ctr->count;
obj->object.attribute_ctr.attributes = talloc_array(obj, struct drsuapi_DsReplicaAttribute,
obj->object.attribute_ctr.num_attributes);
if (obj->object.attribute_ctr.attributes == NULL) {
return WERR_NOT_ENOUGH_MEMORY;
}
/*
* Note that the meta_data array and the attributes array must
* be the same size and in the same order
*/
for (i=0; iobject.attribute_ctr.num_attributes; i++) {
struct ldb_message_element *el;
const struct dsdb_attribute *sa;
sa = dsdb_attribute_by_attributeID_id(schema, attids[i]);
if (!sa) {
DEBUG(0,("Unable to find attributeID %u in schema\n", attids[i]));
return WERR_DS_DRA_INTERNAL_ERROR;
}
el = ldb_msg_find_element(msg, sa->lDAPDisplayName);
if (el == NULL) {
/* this happens for attributes that have been removed */
DEBUG(5,("No element '%s' for attributeID %u in message\n",
sa->lDAPDisplayName, attids[i]));
ZERO_STRUCT(obj->object.attribute_ctr.attributes[i]);
obj->object.attribute_ctr.attributes[i].attid =
dsdb_attribute_get_attid(sa, syntax_ctx.is_schema_nc);
} else {
werr = sa->syntax->ldb_to_drsuapi(&syntax_ctx, sa, el, obj,
&obj->object.attribute_ctr.attributes[i]);
if (!W_ERROR_IS_OK(werr)) {
DEBUG(0,("Unable to convert %s on %s to DRS object - %s\n",
sa->lDAPDisplayName, ldb_dn_get_linearized(msg->dn),
win_errstr(werr)));
return werr;
}
/* if DRSUAPI_DRS_SPECIAL_SECRET_PROCESSING is set
* check if attribute is secret and send a null value
*/
if (replica_flags & DRSUAPI_DRS_SPECIAL_SECRET_PROCESSING) {
drsuapi_process_secret_attribute(&obj->object.attribute_ctr.attributes[i],
&obj->meta_data_ctr->meta_data[i]);
}
/* some attributes needs to be encrypted
before being sent */
werr = drsuapi_encrypt_attribute(obj, session_key, rid,
&obj->object.attribute_ctr.attributes[i]);
if (!W_ERROR_IS_OK(werr)) {
DEBUG(0,("Unable to encrypt %s on %s in DRS object - %s\n",
sa->lDAPDisplayName, ldb_dn_get_linearized(msg->dn),
win_errstr(werr)));
return werr;
}
}
if (attids[i] != obj->object.attribute_ctr.attributes[i].attid) {
DEBUG(0, ("Unable to replicate attribute %s on %s via DRS, incorrect attributeID: "
"0x%08x vs 0x%08x "
"Run dbcheck!\n",
sa->lDAPDisplayName,
ldb_dn_get_linearized(msg->dn),
attids[i],
obj->object.attribute_ctr.attributes[i].attid));
return WERR_DS_DATABASE_ERROR;
}
}
return WERR_OK;
}
/*
add one linked attribute from an object to the list of linked
attributes in a getncchanges request
*/
static WERROR get_nc_changes_add_la(TALLOC_CTX *mem_ctx,
struct ldb_context *sam_ctx,
const struct dsdb_schema *schema,
const struct dsdb_attribute *sa,
const struct ldb_message *msg,
struct dsdb_dn *dsdb_dn,
struct drsuapi_DsReplicaLinkedAttribute **la_list,
uint32_t *la_count,
bool is_schema_nc)
{
struct drsuapi_DsReplicaLinkedAttribute *la;
bool active;
NTSTATUS status;
WERROR werr;
(*la_list) = talloc_realloc(mem_ctx, *la_list, struct drsuapi_DsReplicaLinkedAttribute, (*la_count)+1);
W_ERROR_HAVE_NO_MEMORY(*la_list);
la = &(*la_list)[*la_count];
la->identifier = get_object_identifier(*la_list, msg);
W_ERROR_HAVE_NO_MEMORY(la->identifier);
active = (dsdb_dn_rmd_flags(dsdb_dn->dn) & DSDB_RMD_FLAG_DELETED) == 0;
if (!active) {
/* We have to check that the inactive link still point to an existing object */
struct GUID guid;
struct ldb_dn *tdn;
int ret;
const char *v;
v = ldb_msg_find_attr_as_string(msg, "isDeleted", "FALSE");
if (strncmp(v, "TRUE", 4) == 0) {
/*
* Note: we skip the transmission of the deleted link even if the other part used to
* know about it because when we transmit the deletion of the object, the link will
* be deleted too due to deletion of object where link points and Windows do so.
*/
if (dsdb_functional_level(sam_ctx) >= DS_DOMAIN_FUNCTION_2008_R2) {
v = ldb_msg_find_attr_as_string(msg, "isRecycled", "FALSE");
/*
* On Windows 2008R2 isRecycled is always present even if FL or DL are < FL 2K8R2
* if it join an existing domain with deleted objects, it firsts impose to have a
* schema with the is-Recycled object and for all deleted objects it adds the isRecycled
* either during initial replication or after the getNCChanges.
* Behavior of samba has been changed to always have this attribute if it's present in the schema.
*
* So if FL <2K8R2 isRecycled might be here or not but we don't care, it's meaning less.
* If FL >=2K8R2 we are sure that this attribute will be here.
* For this kind of forest level we do not return the link if the object is recycled
* (isRecycled = true).
*/
if (strncmp(v, "TRUE", 4) == 0) {
DEBUG(2, (" object %s is recycled, not returning linked attribute !\n",
ldb_dn_get_linearized(msg->dn)));
return WERR_OK;
}
} else {
return WERR_OK;
}
}
status = dsdb_get_extended_dn_guid(dsdb_dn->dn, &guid, "GUID");
if (!NT_STATUS_IS_OK(status)) {
DEBUG(0,(__location__ " Unable to extract GUID in linked attribute '%s' in '%s'\n",
sa->lDAPDisplayName, ldb_dn_get_linearized(msg->dn)));
return ntstatus_to_werror(status);
}
ret = dsdb_find_dn_by_guid(sam_ctx, mem_ctx, &guid, 0, &tdn);
if (ret == LDB_ERR_NO_SUCH_OBJECT) {
DEBUG(2, (" Search of guid %s returned 0 objects, skipping it !\n",
GUID_string(mem_ctx, &guid)));
return WERR_OK;
} else if (ret != LDB_SUCCESS) {
DEBUG(0, (__location__ " Search of guid %s failed with error code %d\n",
GUID_string(mem_ctx, &guid),
ret));
return WERR_OK;
}
}
la->attid = dsdb_attribute_get_attid(sa, is_schema_nc);
la->flags = active?DRSUAPI_DS_LINKED_ATTRIBUTE_FLAG_ACTIVE:0;
status = dsdb_get_extended_dn_uint32(dsdb_dn->dn, &la->meta_data.version, "RMD_VERSION");
if (!NT_STATUS_IS_OK(status)) {
DEBUG(0,(__location__ " No RMD_VERSION in linked attribute '%s' in '%s'\n",
sa->lDAPDisplayName, ldb_dn_get_linearized(msg->dn)));
return ntstatus_to_werror(status);
}
status = dsdb_get_extended_dn_nttime(dsdb_dn->dn, &la->meta_data.originating_change_time, "RMD_CHANGETIME");
if (!NT_STATUS_IS_OK(status)) {
DEBUG(0,(__location__ " No RMD_CHANGETIME in linked attribute '%s' in '%s'\n",
sa->lDAPDisplayName, ldb_dn_get_linearized(msg->dn)));
return ntstatus_to_werror(status);
}
status = dsdb_get_extended_dn_guid(dsdb_dn->dn, &la->meta_data.originating_invocation_id, "RMD_INVOCID");
if (!NT_STATUS_IS_OK(status)) {
DEBUG(0,(__location__ " No RMD_INVOCID in linked attribute '%s' in '%s'\n",
sa->lDAPDisplayName, ldb_dn_get_linearized(msg->dn)));
return ntstatus_to_werror(status);
}
status = dsdb_get_extended_dn_uint64(dsdb_dn->dn, &la->meta_data.originating_usn, "RMD_ORIGINATING_USN");
if (!NT_STATUS_IS_OK(status)) {
DEBUG(0,(__location__ " No RMD_ORIGINATING_USN in linked attribute '%s' in '%s'\n",
sa->lDAPDisplayName, ldb_dn_get_linearized(msg->dn)));
return ntstatus_to_werror(status);
}
status = dsdb_get_extended_dn_nttime(dsdb_dn->dn, &la->originating_add_time, "RMD_ADDTIME");
if (!NT_STATUS_IS_OK(status)) {
/* this is possible for upgraded links */
la->originating_add_time = la->meta_data.originating_change_time;
}
werr = dsdb_dn_la_to_blob(sam_ctx, sa, schema, *la_list, dsdb_dn, &la->value.blob);
W_ERROR_NOT_OK_RETURN(werr);
(*la_count)++;
return WERR_OK;
}
/*
add linked attributes from an object to the list of linked
attributes in a getncchanges request
*/
static WERROR get_nc_changes_add_links(struct ldb_context *sam_ctx,
TALLOC_CTX *mem_ctx,
bool is_schema_nc,
struct dsdb_schema *schema,
uint64_t highest_usn,
uint32_t replica_flags,
const struct ldb_message *msg,
struct drsuapi_DsReplicaLinkedAttribute **la_list,
uint32_t *la_count,
struct drsuapi_DsReplicaCursorCtrEx *uptodateness_vector)
{
unsigned int i;
TALLOC_CTX *tmp_ctx = NULL;
uint64_t uSNChanged = ldb_msg_find_attr_as_uint64(msg, "uSNChanged", 0);
bool is_critical = ldb_msg_find_attr_as_bool(msg, "isCriticalSystemObject", false);
if (replica_flags & DRSUAPI_DRS_CRITICAL_ONLY) {
if (!is_critical) {
return WERR_OK;
}
}
if (uSNChanged <= highest_usn) {
return WERR_OK;
}
tmp_ctx = talloc_new(mem_ctx);
if (tmp_ctx == NULL) {
return WERR_NOT_ENOUGH_MEMORY;
}
for (i=0; inum_elements; i++) {
struct ldb_message_element *el = &msg->elements[i];
const struct dsdb_attribute *sa;
unsigned int j;
sa = dsdb_attribute_by_lDAPDisplayName(schema, el->name);
if (!sa || sa->linkID == 0 || (sa->linkID & 1)) {
/* we only want forward links */
continue;
}
if (el->num_values && !dsdb_dn_is_upgraded_link_val(&el->values[0])) {
/* its an old style link, it will have been
* sent in the main replication data */
continue;
}
for (j=0; jnum_values; j++) {
struct dsdb_dn *dsdb_dn;
uint64_t local_usn;
uint64_t originating_usn;
NTSTATUS status, status2;
WERROR werr;
struct GUID originating_invocation_id;
dsdb_dn = dsdb_dn_parse(tmp_ctx, sam_ctx, &el->values[j], sa->syntax->ldap_oid);
if (dsdb_dn == NULL) {
DEBUG(1,(__location__ ": Failed to parse DN for %s in %s\n",
el->name, ldb_dn_get_linearized(msg->dn)));
talloc_free(tmp_ctx);
return WERR_DS_DRA_INTERNAL_ERROR;
}
status = dsdb_get_extended_dn_uint64(dsdb_dn->dn, &local_usn, "RMD_LOCAL_USN");
if (!NT_STATUS_IS_OK(status)) {
/* this can happen for attributes
given to us with old style meta
data */
continue;
}
if (local_usn > uSNChanged) {
DEBUG(1,(__location__ ": uSNChanged less than RMD_LOCAL_USN for %s on %s\n",
el->name, ldb_dn_get_linearized(msg->dn)));
talloc_free(tmp_ctx);
return WERR_DS_DRA_INTERNAL_ERROR;
}
if (local_usn <= highest_usn) {
continue;
}
status = dsdb_get_extended_dn_guid(dsdb_dn->dn,
&originating_invocation_id,
"RMD_INVOCID");
status2 = dsdb_get_extended_dn_uint64(dsdb_dn->dn,
&originating_usn,
"RMD_ORIGINATING_USN");
if (NT_STATUS_IS_OK(status) && NT_STATUS_IS_OK(status2)) {
if (udv_filter(uptodateness_vector,
&originating_invocation_id,
originating_usn)) {
continue;
}
}
werr = get_nc_changes_add_la(mem_ctx, sam_ctx, schema,
sa, msg, dsdb_dn, la_list,
la_count, is_schema_nc);
if (!W_ERROR_IS_OK(werr)) {
talloc_free(tmp_ctx);
return werr;
}
}
}
talloc_free(tmp_ctx);
return WERR_OK;
}
/*
fill in the cursors return based on the replUpToDateVector for the ncRoot_dn
*/
static WERROR get_nc_changes_udv(struct ldb_context *sam_ctx,
struct ldb_dn *ncRoot_dn,
struct drsuapi_DsReplicaCursor2CtrEx *udv)
{
int ret;
udv->version = 2;
udv->reserved1 = 0;
udv->reserved2 = 0;
ret = dsdb_load_udv_v2(sam_ctx, ncRoot_dn, udv, &udv->cursors, &udv->count);
if (ret != LDB_SUCCESS) {
DEBUG(0,(__location__ ": Failed to load UDV for %s - %s\n",
ldb_dn_get_linearized(ncRoot_dn), ldb_errstring(sam_ctx)));
return WERR_DS_DRA_INTERNAL_ERROR;
}
return WERR_OK;
}
/* comparison function for linked attributes - see CompareLinks() in
* MS-DRSR section 4.1.10.5.17 */
static int linked_attribute_compare(const struct la_for_sorting *la1,
const struct la_for_sorting *la2)
{
int c;
c = memcmp(la1->source_guid,
la2->source_guid, sizeof(la2->source_guid));
if (c != 0) {
return c;
}
if (la1->link->attid != la2->link->attid) {
return la1->link->attid < la2->link->attid? -1:1;
}
if ((la1->link->flags & DRSUAPI_DS_LINKED_ATTRIBUTE_FLAG_ACTIVE) !=
(la2->link->flags & DRSUAPI_DS_LINKED_ATTRIBUTE_FLAG_ACTIVE)) {
return (la1->link->flags &
DRSUAPI_DS_LINKED_ATTRIBUTE_FLAG_ACTIVE)? 1:-1;
}
return memcmp(la1->target_guid,
la2->target_guid, sizeof(la2->target_guid));
}
struct drsuapi_changed_objects {
struct ldb_dn *dn;
struct GUID guid;
uint64_t usn;
};
/*
sort the objects we send by tree order (Samba 4.5 emulation)
*/
static int site_res_cmp_anc_order(struct drsuapi_changed_objects *m1,
struct drsuapi_changed_objects *m2)
{
return ldb_dn_compare(m2->dn, m1->dn);
}
/*
sort the objects we send first by uSNChanged
*/
static int site_res_cmp_usn_order(struct drsuapi_changed_objects *m1,
struct drsuapi_changed_objects *m2)
{
if (m1->usn == m2->usn) {
return ldb_dn_compare(m2->dn, m1->dn);
}
if (m1->usn < m2->usn) {
return -1;
}
return 1;
}
/*
handle a DRSUAPI_EXOP_FSMO_RID_ALLOC call
*/
static WERROR getncchanges_rid_alloc(struct drsuapi_bind_state *b_state,
TALLOC_CTX *mem_ctx,
struct drsuapi_DsGetNCChangesRequest10 *req10,
struct drsuapi_DsGetNCChangesCtr6 *ctr6,
struct ldb_dn **rid_manager_dn)
{
struct ldb_dn *req_dn, *ntds_dn = NULL;
int ret;
struct ldb_context *ldb = b_state->sam_ctx;
struct ldb_result *ext_res;
struct dsdb_fsmo_extended_op *exop;
bool is_us;
/*
steps:
- verify that the DN being asked for is the RID Manager DN
- verify that we are the RID Manager
*/
/* work out who is the RID Manager, also return to caller */
ret = samdb_rid_manager_dn(ldb, mem_ctx, rid_manager_dn);
if (ret != LDB_SUCCESS) {
DEBUG(0, (__location__ ": Failed to find RID Manager object - %s\n", ldb_errstring(ldb)));
return WERR_DS_DRA_INTERNAL_ERROR;
}
ret = drs_ObjectIdentifier_to_dn_and_nc_root(mem_ctx,
ldb,
req10->naming_context,
&req_dn,
NULL);
if (ret != LDB_SUCCESS) {
DBG_ERR("RID Alloc request for invalid DN %s: %s\n",
drs_ObjectIdentifier_to_debug_string(mem_ctx, req10->naming_context),
ldb_strerror(ret));
ctr6->extended_ret = DRSUAPI_EXOP_ERR_MISMATCH;
return WERR_OK;
}
if (ldb_dn_compare(req_dn, *rid_manager_dn) != 0) {
/* that isn't the RID Manager DN */
DBG_ERR("RID Alloc request for wrong DN %s\n",
drs_ObjectIdentifier_to_debug_string(mem_ctx,
req10->naming_context));
ctr6->extended_ret = DRSUAPI_EXOP_ERR_MISMATCH;
return WERR_OK;
}
/* TODO: make sure ntds_dn is a valid nTDSDSA object */
ret = dsdb_find_dn_by_guid(ldb, mem_ctx, &req10->destination_dsa_guid, 0, &ntds_dn);
if (ret != LDB_SUCCESS) {
DEBUG(0, (__location__ ": Unable to find NTDS object for guid %s - %s\n",
GUID_string(mem_ctx, &req10->destination_dsa_guid), ldb_errstring(ldb)));
ctr6->extended_ret = DRSUAPI_EXOP_ERR_UNKNOWN_CALLER;
return WERR_OK;
}
/* find the DN of the RID Manager */
ret = samdb_reference_dn_is_our_ntdsa(ldb, *rid_manager_dn, "fSMORoleOwner", &is_us);
if (ret != LDB_SUCCESS) {
DEBUG(0,("Failed to find fSMORoleOwner in RID Manager object\n"));
ctr6->extended_ret = DRSUAPI_EXOP_ERR_FSMO_NOT_OWNER;
return WERR_DS_DRA_INTERNAL_ERROR;
}
if (!is_us) {
/* we're not the RID Manager - go away */
DEBUG(0,(__location__ ": RID Alloc request when not RID Manager\n"));
ctr6->extended_ret = DRSUAPI_EXOP_ERR_FSMO_NOT_OWNER;
return WERR_OK;
}
exop = talloc(mem_ctx, struct dsdb_fsmo_extended_op);
W_ERROR_HAVE_NO_MEMORY(exop);
exop->fsmo_info = req10->fsmo_info;
exop->destination_dsa_guid = req10->destination_dsa_guid;
ret = ldb_transaction_start(ldb);
if (ret != LDB_SUCCESS) {
DEBUG(0,(__location__ ": Failed transaction start - %s\n",
ldb_errstring(ldb)));
return WERR_DS_DRA_INTERNAL_ERROR;
}
ret = ldb_extended(ldb, DSDB_EXTENDED_ALLOCATE_RID_POOL, exop, &ext_res);
if (ret != LDB_SUCCESS) {
DEBUG(0,(__location__ ": Failed extended allocation RID pool operation - %s\n",
ldb_errstring(ldb)));
ldb_transaction_cancel(ldb);
return WERR_DS_DRA_INTERNAL_ERROR;
}
ret = ldb_transaction_commit(ldb);
if (ret != LDB_SUCCESS) {
DEBUG(0,(__location__ ": Failed transaction commit - %s\n",
ldb_errstring(ldb)));
return WERR_DS_DRA_INTERNAL_ERROR;
}
talloc_free(ext_res);
DEBUG(2,("Allocated RID pool for server %s\n",
GUID_string(mem_ctx, &req10->destination_dsa_guid)));
ctr6->extended_ret = DRSUAPI_EXOP_ERR_SUCCESS;
return WERR_OK;
}
/*
handle a DRSUAPI_EXOP_REPL_SECRET call
*/
static WERROR getncchanges_repl_secret(struct drsuapi_bind_state *b_state,
TALLOC_CTX *mem_ctx,
struct drsuapi_DsGetNCChangesRequest10 *req10,
struct dom_sid *user_sid,
struct drsuapi_DsGetNCChangesCtr6 *ctr6,
bool has_get_all_changes,
struct ldb_dn **machine_dn)
{
struct drsuapi_DsReplicaObjectIdentifier *ncRoot = req10->naming_context;
struct ldb_dn *obj_dn = NULL;
struct ldb_message *ntds_msg = NULL;
struct ldb_dn *ntds_dn = NULL, *server_dn = NULL;
struct ldb_dn *rodc_dn, *krbtgt_link_dn;
int ret;
const char *ntds_attrs[] = { NULL };
const char *rodc_attrs[] = { "msDS-KrbTgtLink",
"msDS-NeverRevealGroup",
"msDS-RevealOnDemandGroup",
"userAccountControl",
NULL };
const char *obj_attrs[] = { "tokenGroups", "objectSid", "UserAccountControl", "msDS-KrbTgtLinkBL", NULL };
struct ldb_result *rodc_res = NULL, *obj_res = NULL;
WERROR werr;
struct GUID_txt_buf guid_buf;
DEBUG(3,(__location__ ": DRSUAPI_EXOP_REPL_SECRET extended op on %s\n",
drs_ObjectIdentifier_to_debug_string(mem_ctx, ncRoot)));
/*
* we need to work out if we will allow this DC to
* replicate the secrets for this object
*
* see 4.1.10.5.14 GetRevealSecretsPolicyForUser for details
* of this function
*/
if (b_state->sam_ctx_system == NULL) {
/* this operation needs system level access */
ctr6->extended_ret = DRSUAPI_EXOP_ERR_ACCESS_DENIED;
return WERR_DS_DRA_ACCESS_DENIED;
}
/*
* Before we accept or deny, fetch the machine DN for the destination
* DSA GUID.
*
* If we are the RODC, we will check that this matches the SID.
*/
ret = samdb_get_ntds_obj_by_guid(mem_ctx,
b_state->sam_ctx_system,
&req10->destination_dsa_guid,
ntds_attrs,
&ntds_msg);
if (ret != LDB_SUCCESS) {
goto dest_dsa_error;
}
ntds_dn = ntds_msg->dn;
server_dn = ldb_dn_get_parent(mem_ctx, ntds_dn);
if (server_dn == NULL) {
goto failed;
}
ret = samdb_reference_dn(b_state->sam_ctx_system, mem_ctx, server_dn,
"serverReference", machine_dn);
if (ret != LDB_SUCCESS) {
goto dest_dsa_error;
}
/*
* In MS-DRSR.pdf 5.99 IsGetNCChangesPermissionGranted
*
* The pseudo code indicate
* revealsecrets = true
* if IsRevealSecretRequest(msgIn) then
* if AccessCheckCAR(ncRoot, Ds-Replication-Get-Changes-All) = false
* then
* if (msgIn.ulExtendedOp = EXOP_REPL_SECRETS) then
* <... check if this account is ok to be replicated on this DC ...>
* <... and if not reveal secrets = no ...>
* else
* reveal secrets = false
* endif
* endif
* endif
*
* Which basically means that if you have GET_ALL_CHANGES rights (~== RWDC)
* then you can do EXOP_REPL_SECRETS
*/
ret = drs_ObjectIdentifier_to_dn_and_nc_root(mem_ctx,
b_state->sam_ctx_system,
ncRoot,
&obj_dn,
NULL);
if (ret != LDB_SUCCESS) {
DBG_ERR("RevealSecretRequest for invalid DN %s\n",
drs_ObjectIdentifier_to_debug_string(mem_ctx, ncRoot));
goto failed;
}
if (!ldb_dn_validate(obj_dn)) goto failed;
if (has_get_all_changes) {
goto allowed;
}
rodc_dn = ldb_dn_new_fmt(mem_ctx, b_state->sam_ctx_system, "",
dom_sid_string(mem_ctx, user_sid));
if (!ldb_dn_validate(rodc_dn)) goto failed;
/*
* do the two searches we need
* We need DSDB_SEARCH_SHOW_EXTENDED_DN as we get a SID lists
* out of the extended DNs
*/
ret = dsdb_search_dn(b_state->sam_ctx_system, mem_ctx, &rodc_res, rodc_dn, rodc_attrs,
DSDB_SEARCH_SHOW_EXTENDED_DN);
if (ret != LDB_SUCCESS || rodc_res->count != 1) goto failed;
ret = dsdb_search_dn(b_state->sam_ctx_system, mem_ctx, &obj_res, obj_dn, obj_attrs, 0);
if (ret != LDB_SUCCESS || obj_res->count != 1) goto failed;
/*
* Must be an RODC account at this point, verify machine DN matches the
* SID account
*/
if (ldb_dn_compare(rodc_res->msgs[0]->dn, *machine_dn) != 0) {
goto denied;
}
/* an RODC is allowed to get its own krbtgt account secrets */
krbtgt_link_dn = samdb_result_dn(b_state->sam_ctx_system, mem_ctx,
rodc_res->msgs[0], "msDS-KrbTgtLink", NULL);
if (krbtgt_link_dn != NULL &&
ldb_dn_compare(obj_dn, krbtgt_link_dn) == 0) {
goto allowed;
}
werr = samdb_confirm_rodc_allowed_to_repl_to(b_state->sam_ctx_system,
user_sid,
rodc_res->msgs[0],
obj_res->msgs[0]);
if (W_ERROR_IS_OK(werr)) {
goto allowed;
}
/* default deny */
denied:
DEBUG(2,(__location__ ": Denied single object with secret replication for %s by RODC %s\n",
ldb_dn_get_linearized(obj_dn), ldb_dn_get_linearized(rodc_res->msgs[0]->dn)));
ctr6->extended_ret = DRSUAPI_EXOP_ERR_NONE;
return WERR_DS_DRA_SECRETS_DENIED;
allowed:
DEBUG(2,(__location__ ": Allowed single object with secret replication for %s by %s %s\n",
ldb_dn_get_linearized(obj_dn), has_get_all_changes?"RWDC":"RODC",
ldb_dn_get_linearized(*machine_dn)));
ctr6->extended_ret = DRSUAPI_EXOP_ERR_SUCCESS;
req10->highwatermark.highest_usn = 0;
return WERR_OK;
failed:
DEBUG(2,(__location__ ": Failed single secret replication for %s by RODC %s\n",
ldb_dn_get_linearized(obj_dn), dom_sid_string(mem_ctx, user_sid)));
ctr6->extended_ret = DRSUAPI_EXOP_ERR_NONE;
return WERR_DS_DRA_BAD_DN;
dest_dsa_error:
DBG_WARNING("Failed secret replication for %s by RODC %s as dest_dsa_guid %s is invalid\n",
ldb_dn_get_linearized(obj_dn),
dom_sid_string(mem_ctx, user_sid),
GUID_buf_string(&req10->destination_dsa_guid,
&guid_buf));
ctr6->extended_ret = DRSUAPI_EXOP_ERR_NONE;
return WERR_DS_DRA_DB_ERROR;
}
/*
handle a DRSUAPI_EXOP_REPL_OBJ call
*/
static WERROR getncchanges_repl_obj(struct drsuapi_bind_state *b_state,
TALLOC_CTX *mem_ctx,
struct drsuapi_DsGetNCChangesRequest10 *req10,
struct dom_sid *user_sid,
struct drsuapi_DsGetNCChangesCtr6 *ctr6)
{
struct drsuapi_DsReplicaObjectIdentifier *ncRoot = req10->naming_context;
DEBUG(3,(__location__ ": DRSUAPI_EXOP_REPL_OBJ extended op on %s\n",
drs_ObjectIdentifier_to_debug_string(mem_ctx, ncRoot)));
ctr6->extended_ret = DRSUAPI_EXOP_ERR_SUCCESS;
return WERR_OK;
}
/*
handle DRSUAPI_EXOP_FSMO_REQ_ROLE,
DRSUAPI_EXOP_FSMO_RID_REQ_ROLE,
and DRSUAPI_EXOP_FSMO_REQ_PDC calls
*/
static WERROR getncchanges_change_master(struct drsuapi_bind_state *b_state,
TALLOC_CTX *mem_ctx,
struct drsuapi_DsGetNCChangesRequest10 *req10,
struct drsuapi_DsGetNCChangesCtr6 *ctr6)
{
struct ldb_dn *req_dn, *ntds_dn;
int ret;
unsigned int i;
struct ldb_context *ldb = b_state->sam_ctx;
struct ldb_message *msg;
bool is_us;
/*
steps:
- verify that the client dn exists
- verify that we are the current master
*/
ret = drs_ObjectIdentifier_to_dn_and_nc_root(mem_ctx, ldb, req10->naming_context,
&req_dn, NULL);
if (ret != LDB_SUCCESS) {
/* that is not a valid dn */
DBG_ERR("FSMO role transfer request for invalid DN %s: %s\n",
drs_ObjectIdentifier_to_debug_string(mem_ctx, req10->naming_context),
ldb_strerror(ret));
ctr6->extended_ret = DRSUAPI_EXOP_ERR_MISMATCH;
return WERR_OK;
}
/* find the DN of the current role owner */
ret = samdb_reference_dn_is_our_ntdsa(ldb, req_dn, "fSMORoleOwner", &is_us);
if (ret != LDB_SUCCESS) {
DEBUG(0,("Failed to find fSMORoleOwner in RID Manager object\n"));
ctr6->extended_ret = DRSUAPI_EXOP_ERR_FSMO_NOT_OWNER;
return WERR_DS_DRA_INTERNAL_ERROR;
}
if (!is_us) {
/* we're not the RID Manager or role owner - go away */
DEBUG(0,(__location__ ": FSMO role or RID manager transfer owner request when not role owner\n"));
ctr6->extended_ret = DRSUAPI_EXOP_ERR_FSMO_NOT_OWNER;
return WERR_OK;
}
/* change the current master */
msg = ldb_msg_new(ldb);
W_ERROR_HAVE_NO_MEMORY(msg);
ret = drs_ObjectIdentifier_to_dn_and_nc_root(msg, ldb, req10->naming_context,
&msg->dn, NULL);
if (ret != LDB_SUCCESS) {
/* that is not a valid dn */
DBG_ERR("FSMO role transfer request for invalid DN %s: %s\n",
drs_ObjectIdentifier_to_debug_string(mem_ctx, req10->naming_context),
ldb_strerror(ret));
ctr6->extended_ret = DRSUAPI_EXOP_ERR_MISMATCH;
return WERR_OK;
}
/* TODO: make sure ntds_dn is a valid nTDSDSA object */
ret = dsdb_find_dn_by_guid(ldb, msg, &req10->destination_dsa_guid, 0, &ntds_dn);
if (ret != LDB_SUCCESS) {
DEBUG(0, (__location__ ": Unable to find NTDS object for guid %s - %s\n",
GUID_string(mem_ctx, &req10->destination_dsa_guid), ldb_errstring(ldb)));
talloc_free(msg);
ctr6->extended_ret = DRSUAPI_EXOP_ERR_UNKNOWN_CALLER;
return WERR_OK;
}
ret = ldb_msg_add_string(msg, "fSMORoleOwner", ldb_dn_get_linearized(ntds_dn));
if (ret != 0) {
talloc_free(msg);
return WERR_DS_DRA_INTERNAL_ERROR;
}
for (i=0;inum_elements;i++) {
msg->elements[i].flags = LDB_FLAG_MOD_REPLACE;
}
ret = ldb_transaction_start(ldb);
if (ret != LDB_SUCCESS) {
DEBUG(0,(__location__ ": Failed transaction start - %s\n",
ldb_errstring(ldb)));
return WERR_DS_DRA_INTERNAL_ERROR;
}
ret = ldb_modify(ldb, msg);
if (ret != LDB_SUCCESS) {
DEBUG(0,(__location__ ": Failed to change current owner - %s\n",
ldb_errstring(ldb)));
ldb_transaction_cancel(ldb);
return WERR_DS_DRA_INTERNAL_ERROR;
}
ret = ldb_transaction_commit(ldb);
if (ret != LDB_SUCCESS) {
DEBUG(0,(__location__ ": Failed transaction commit - %s\n",
ldb_errstring(ldb)));
return WERR_DS_DRA_INTERNAL_ERROR;
}
ctr6->extended_ret = DRSUAPI_EXOP_ERR_SUCCESS;
return WERR_OK;
}
/*
see if this getncchanges request includes a request to reveal secret information
*/
static WERROR dcesrv_drsuapi_is_reveal_secrets_request(struct drsuapi_bind_state *b_state,
struct drsuapi_DsGetNCChangesRequest10 *req10,
struct dsdb_schema_prefixmap *pfm_remote,
bool *is_secret_request)
{
enum drsuapi_DsExtendedOperation exop;
uint32_t i;
struct dsdb_schema *schema;
struct dsdb_syntax_ctx syntax_ctx;
*is_secret_request = true;
exop = req10->extended_op;
switch (exop) {
case DRSUAPI_EXOP_FSMO_REQ_ROLE:
case DRSUAPI_EXOP_FSMO_RID_ALLOC:
case DRSUAPI_EXOP_FSMO_RID_REQ_ROLE:
case DRSUAPI_EXOP_FSMO_REQ_PDC:
case DRSUAPI_EXOP_FSMO_ABANDON_ROLE:
/* FSMO exops can reveal secrets */
*is_secret_request = true;
return WERR_OK;
case DRSUAPI_EXOP_REPL_SECRET:
case DRSUAPI_EXOP_REPL_OBJ:
case DRSUAPI_EXOP_NONE:
break;
}
if (req10->replica_flags & DRSUAPI_DRS_SPECIAL_SECRET_PROCESSING) {
*is_secret_request = false;
return WERR_OK;
}
if (exop == DRSUAPI_EXOP_REPL_SECRET ||
req10->partial_attribute_set == NULL) {
/* they want secrets */
*is_secret_request = true;
return WERR_OK;
}
schema = dsdb_get_schema(b_state->sam_ctx, NULL);
dsdb_syntax_ctx_init(&syntax_ctx, b_state->sam_ctx, schema);
syntax_ctx.pfm_remote = pfm_remote;
/* check the attributes they asked for */
for (i=0; ipartial_attribute_set->num_attids; i++) {
const struct dsdb_attribute *sa;
WERROR werr = getncchanges_attid_remote_to_local(schema,
&syntax_ctx,
req10->partial_attribute_set->attids[i],
NULL,
&sa);
if (!W_ERROR_IS_OK(werr)) {
DEBUG(0,(__location__": attid 0x%08X not found: %s\n",
req10->partial_attribute_set->attids[i], win_errstr(werr)));
return werr;
}
if (!dsdb_attr_in_rodc_fas(sa)) {
*is_secret_request = true;
return WERR_OK;
}
}
if (req10->partial_attribute_set_ex) {
/* check the extended attributes they asked for */
for (i=0; ipartial_attribute_set_ex->num_attids; i++) {
const struct dsdb_attribute *sa;
WERROR werr = getncchanges_attid_remote_to_local(schema,
&syntax_ctx,
req10->partial_attribute_set_ex->attids[i],
NULL,
&sa);
if (!W_ERROR_IS_OK(werr)) {
DEBUG(0,(__location__": attid 0x%08X not found: %s\n",
req10->partial_attribute_set_ex->attids[i], win_errstr(werr)));
return werr;
}
if (!dsdb_attr_in_rodc_fas(sa)) {
*is_secret_request = true;
return WERR_OK;
}
}
}
*is_secret_request = false;
return WERR_OK;
}
/*
see if this getncchanges request is only for attributes in the GC
partial attribute set
*/
static WERROR dcesrv_drsuapi_is_gc_pas_request(struct drsuapi_bind_state *b_state,
struct drsuapi_DsGetNCChangesRequest10 *req10,
struct dsdb_schema_prefixmap *pfm_remote,
bool *is_gc_pas_request)
{
enum drsuapi_DsExtendedOperation exop;
uint32_t i;
struct dsdb_schema *schema;
struct dsdb_syntax_ctx syntax_ctx;
exop = req10->extended_op;
switch (exop) {
case DRSUAPI_EXOP_FSMO_REQ_ROLE:
case DRSUAPI_EXOP_FSMO_RID_ALLOC:
case DRSUAPI_EXOP_FSMO_RID_REQ_ROLE:
case DRSUAPI_EXOP_FSMO_REQ_PDC:
case DRSUAPI_EXOP_FSMO_ABANDON_ROLE:
case DRSUAPI_EXOP_REPL_SECRET:
*is_gc_pas_request = false;
return WERR_OK;
case DRSUAPI_EXOP_REPL_OBJ:
case DRSUAPI_EXOP_NONE:
break;
}
if (req10->partial_attribute_set == NULL) {
/* they want it all */
*is_gc_pas_request = false;
return WERR_OK;
}
schema = dsdb_get_schema(b_state->sam_ctx, NULL);
dsdb_syntax_ctx_init(&syntax_ctx, b_state->sam_ctx, schema);
syntax_ctx.pfm_remote = pfm_remote;
/* check the attributes they asked for */
for (i=0; ipartial_attribute_set->num_attids; i++) {
const struct dsdb_attribute *sa;
WERROR werr = getncchanges_attid_remote_to_local(schema,
&syntax_ctx,
req10->partial_attribute_set->attids[i],
NULL,
&sa);
if (!W_ERROR_IS_OK(werr)) {
DEBUG(0,(__location__": attid 0x%08X not found: %s\n",
req10->partial_attribute_set->attids[i], win_errstr(werr)));
return werr;
}
if (!sa->isMemberOfPartialAttributeSet) {
*is_gc_pas_request = false;
return WERR_OK;
}
}
if (req10->partial_attribute_set_ex) {
/* check the extended attributes they asked for */
for (i=0; ipartial_attribute_set_ex->num_attids; i++) {
const struct dsdb_attribute *sa;
WERROR werr = getncchanges_attid_remote_to_local(schema,
&syntax_ctx,
req10->partial_attribute_set_ex->attids[i],
NULL,
&sa);
if (!W_ERROR_IS_OK(werr)) {
DEBUG(0,(__location__": attid 0x%08X not found: %s\n",
req10->partial_attribute_set_ex->attids[i], win_errstr(werr)));
return werr;
}
if (!sa->isMemberOfPartialAttributeSet) {
*is_gc_pas_request = false;
return WERR_OK;
}
}
}
*is_gc_pas_request = true;
return WERR_OK;
}
/*
map from req8 to req10
*/
static struct drsuapi_DsGetNCChangesRequest10 *
getncchanges_map_req8(TALLOC_CTX *mem_ctx,
struct drsuapi_DsGetNCChangesRequest8 *req8)
{
struct drsuapi_DsGetNCChangesRequest10 *req10 = talloc_zero(mem_ctx,
struct drsuapi_DsGetNCChangesRequest10);
if (req10 == NULL) {
return NULL;
}
req10->destination_dsa_guid = req8->destination_dsa_guid;
req10->source_dsa_invocation_id = req8->source_dsa_invocation_id;
req10->naming_context = req8->naming_context;
req10->highwatermark = req8->highwatermark;
req10->uptodateness_vector = req8->uptodateness_vector;
req10->replica_flags = req8->replica_flags;
req10->max_object_count = req8->max_object_count;
req10->max_ndr_size = req8->max_ndr_size;
req10->extended_op = req8->extended_op;
req10->fsmo_info = req8->fsmo_info;
req10->partial_attribute_set = req8->partial_attribute_set;
req10->partial_attribute_set_ex = req8->partial_attribute_set_ex;
req10->mapping_ctr = req8->mapping_ctr;
return req10;
}
static const char *collect_objects_attrs[] = { "uSNChanged",
"objectGUID" ,
NULL };
/**
* Collects object for normal replication cycle.
*/
static WERROR getncchanges_collect_objects(struct drsuapi_bind_state *b_state,
TALLOC_CTX *mem_ctx,
struct drsuapi_getncchanges_state *getnc_state,
struct drsuapi_DsGetNCChangesRequest10 *req10,
struct ldb_dn *search_dn,
const char *extra_filter,
struct ldb_result **search_res)
{
int ret;
char* search_filter;
enum ldb_scope scope = LDB_SCOPE_SUBTREE;
bool critical_only = false;
if (req10->replica_flags & DRSUAPI_DRS_CRITICAL_ONLY) {
critical_only = true;
}
if (req10->extended_op == DRSUAPI_EXOP_REPL_OBJ ||
req10->extended_op == DRSUAPI_EXOP_REPL_SECRET) {
scope = LDB_SCOPE_BASE;
critical_only = false;
}
/* Construct response. */
search_filter = talloc_asprintf(mem_ctx,
"(uSNChanged>=%llu)",
(unsigned long long)(getnc_state->min_usn+1));
if (extra_filter) {
search_filter = talloc_asprintf(mem_ctx, "(&%s(%s))", search_filter, extra_filter);
}
if (critical_only) {
search_filter = talloc_asprintf(mem_ctx,
"(&%s(isCriticalSystemObject=TRUE))",
search_filter);
}
if (req10->replica_flags & DRSUAPI_DRS_ASYNC_REP) {
scope = LDB_SCOPE_BASE;
}
if (!search_dn) {
search_dn = getnc_state->ncRoot_dn;
}
DEBUG(2,(__location__ ": getncchanges on %s using filter %s\n",
ldb_dn_get_linearized(getnc_state->ncRoot_dn), search_filter));
ret = drsuapi_search_with_extended_dn(b_state->sam_ctx, getnc_state, search_res,
search_dn, scope,
collect_objects_attrs,
search_filter);
if (ret != LDB_SUCCESS) {
return WERR_DS_DRA_INTERNAL_ERROR;
}
return WERR_OK;
}
/**
* Collects object for normal replication cycle.
*/
static WERROR getncchanges_collect_objects_exop(struct drsuapi_bind_state *b_state,
TALLOC_CTX *mem_ctx,
struct drsuapi_getncchanges_state *getnc_state,
struct drsuapi_DsGetNCChangesRequest10 *req10,
struct drsuapi_DsGetNCChangesCtr6 *ctr6,
struct ldb_dn *search_dn,
const char *extra_filter,
struct ldb_result **search_res)
{
/* we have nothing to do in case of ex-op failure */
if (ctr6->extended_ret != DRSUAPI_EXOP_ERR_SUCCESS) {
return WERR_OK;
}
switch (req10->extended_op) {
case DRSUAPI_EXOP_FSMO_RID_ALLOC:
{
int ret;
struct ldb_dn *ntds_dn = NULL;
struct ldb_dn *server_dn = NULL;
struct ldb_dn *machine_dn = NULL;
struct ldb_dn *rid_set_dn = NULL;
struct ldb_result *search_res2 = NULL;
struct ldb_result *search_res3 = NULL;
TALLOC_CTX *frame = talloc_stackframe();
/* get RID manager, RID set and server DN (in that order) */
/* This first search will get the RID Manager */
ret = drsuapi_search_with_extended_dn(b_state->sam_ctx, frame,
search_res,
search_dn, LDB_SCOPE_BASE,
collect_objects_attrs,
NULL);
if (ret != LDB_SUCCESS) {
DEBUG(1, ("DRSUAPI_EXOP_FSMO_RID_ALLOC: Failed to get RID Manager object %s - %s\n",
ldb_dn_get_linearized(search_dn),
ldb_errstring(b_state->sam_ctx)));
TALLOC_FREE(frame);
return WERR_DS_DRA_INTERNAL_ERROR;
}
if ((*search_res)->count != 1) {
DEBUG(1, ("DRSUAPI_EXOP_FSMO_RID_ALLOC: Failed to get RID Manager object %s - %u objects returned\n",
ldb_dn_get_linearized(search_dn),
(*search_res)->count));
TALLOC_FREE(frame);
return WERR_DS_DRA_INTERNAL_ERROR;
}
/* Now extend it to the RID set */
/* Find the computer account DN for the destination
* dsa GUID specified */
ret = dsdb_find_dn_by_guid(b_state->sam_ctx, frame,
&req10->destination_dsa_guid, 0,
&ntds_dn);
if (ret != LDB_SUCCESS) {
DEBUG(1, ("DRSUAPI_EXOP_FSMO_RID_ALLOC: Unable to find NTDS object for guid %s - %s\n",
GUID_string(frame,
&req10->destination_dsa_guid),
ldb_errstring(b_state->sam_ctx)));
TALLOC_FREE(frame);
return WERR_DS_DRA_INTERNAL_ERROR;
}
server_dn = ldb_dn_get_parent(frame, ntds_dn);
if (!server_dn) {
TALLOC_FREE(frame);
return WERR_DS_DRA_INTERNAL_ERROR;
}
ret = samdb_reference_dn(b_state->sam_ctx, frame, server_dn,
"serverReference", &machine_dn);
if (ret != LDB_SUCCESS) {
DEBUG(1, ("DRSUAPI_EXOP_FSMO_RID_ALLOC: Failed to find serverReference in %s - %s\n",
ldb_dn_get_linearized(server_dn),
ldb_errstring(b_state->sam_ctx)));
TALLOC_FREE(frame);
return WERR_DS_DRA_INTERNAL_ERROR;
}
ret = samdb_reference_dn(b_state->sam_ctx, frame, machine_dn,
"rIDSetReferences", &rid_set_dn);
if (ret != LDB_SUCCESS) {
DEBUG(1, ("DRSUAPI_EXOP_FSMO_RID_ALLOC: Failed to find rIDSetReferences in %s - %s\n",
ldb_dn_get_linearized(server_dn),
ldb_errstring(b_state->sam_ctx)));
TALLOC_FREE(frame);
return WERR_DS_DRA_INTERNAL_ERROR;
}
/* This first search will get the RID Manager, now get the RID set */
ret = drsuapi_search_with_extended_dn(b_state->sam_ctx, frame,
&search_res2,
rid_set_dn, LDB_SCOPE_BASE,
collect_objects_attrs,
NULL);
if (ret != LDB_SUCCESS) {
DEBUG(1, ("DRSUAPI_EXOP_FSMO_RID_ALLOC: Failed to get RID Set object %s - %s\n",
ldb_dn_get_linearized(rid_set_dn),
ldb_errstring(b_state->sam_ctx)));
TALLOC_FREE(frame);
return WERR_DS_DRA_INTERNAL_ERROR;
}
if (search_res2->count != 1) {
DEBUG(1, ("DRSUAPI_EXOP_FSMO_RID_ALLOC: Failed to get RID Set object %s - %u objects returned\n",
ldb_dn_get_linearized(rid_set_dn),
search_res2->count));
TALLOC_FREE(frame);
return WERR_DS_DRA_INTERNAL_ERROR;
}
/* Finally get the server DN */
ret = drsuapi_search_with_extended_dn(b_state->sam_ctx, frame,
&search_res3,
machine_dn, LDB_SCOPE_BASE,
collect_objects_attrs,
NULL);
if (ret != LDB_SUCCESS) {
DEBUG(1, ("DRSUAPI_EXOP_FSMO_RID_ALLOC: Failed to get server object %s - %s\n",
ldb_dn_get_linearized(server_dn),
ldb_errstring(b_state->sam_ctx)));
TALLOC_FREE(frame);
return WERR_DS_DRA_INTERNAL_ERROR;
}
if (search_res3->count != 1) {
DEBUG(1, ("DRSUAPI_EXOP_FSMO_RID_ALLOC: Failed to get server object %s - %u objects returned\n",
ldb_dn_get_linearized(server_dn),
search_res3->count));
TALLOC_FREE(frame);
return WERR_DS_DRA_INTERNAL_ERROR;
}
/* Now extend the original search_res with these answers */
(*search_res)->count = 3;
(*search_res)->msgs = talloc_realloc(frame, (*search_res)->msgs,
struct ldb_message *,
(*search_res)->count);
if ((*search_res)->msgs == NULL) {
TALLOC_FREE(frame);
return WERR_NOT_ENOUGH_MEMORY;
}
talloc_steal(mem_ctx, *search_res);
(*search_res)->msgs[1] =
talloc_steal((*search_res)->msgs, search_res2->msgs[0]);
(*search_res)->msgs[2] =
talloc_steal((*search_res)->msgs, search_res3->msgs[0]);
TALLOC_FREE(frame);
return WERR_OK;
}
default:
/* TODO: implement extended op specific collection
* of objects. Right now we just normal procedure
* for collecting objects */
return getncchanges_collect_objects(b_state,
mem_ctx,
getnc_state,
req10,
search_dn,
extra_filter,
search_res);
}
}
static void dcesrv_drsuapi_update_highwatermark(const struct ldb_message *msg,
uint64_t max_usn,
struct drsuapi_DsReplicaHighWaterMark *hwm)
{
uint64_t uSN = ldb_msg_find_attr_as_uint64(msg, "uSNChanged", 0);
if (uSN > max_usn) {
/*
* Only report the max_usn we had at the start
* of the replication cycle.
*
* If this object has changed lately we better
* let the destination dsa refetch the change.
* This is better than the risk of losing some
* objects or linked attributes.
*/
return;
}
if (uSN <= hwm->tmp_highest_usn) {
return;
}
hwm->tmp_highest_usn = uSN;
hwm->reserved_usn = 0;
}
/**
* Adds an object's GUID to the cache of objects already sent.
* This avoids us sending the same object multiple times when
* the GetNCChanges request uses a flag like GET_ANC.
*/
static WERROR dcesrv_drsuapi_obj_cache_add(struct db_context *obj_cache,
const struct GUID *guid)
{
enum ndr_err_code ndr_err;
uint8_t guid_buf[DRS_GUID_SIZE] = { 0, };
DATA_BLOB b = {
.data = guid_buf,
.length = sizeof(guid_buf),
};
TDB_DATA key = {
.dptr = b.data,
.dsize = b.length,
};
TDB_DATA val = {
.dptr = NULL,
.dsize = 0,
};
NTSTATUS status;
ndr_err = ndr_push_struct_into_fixed_blob(&b, guid,
(ndr_push_flags_fn_t)ndr_push_GUID);
if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
return WERR_DS_DRA_INTERNAL_ERROR;
}
status = dbwrap_store(obj_cache, key, val, TDB_REPLACE);
if (!NT_STATUS_IS_OK(status)) {
return WERR_DS_DRA_INTERNAL_ERROR;
}
return WERR_OK;
}
/**
* Checks if the object with the GUID specified already exists in the
* object cache, i.e. it's already been sent in a GetNCChanges response.
*/
static WERROR dcesrv_drsuapi_obj_cache_exists(struct db_context *obj_cache,
const struct GUID *guid)
{
enum ndr_err_code ndr_err;
uint8_t guid_buf[DRS_GUID_SIZE] = { 0, };
DATA_BLOB b = {
.data = guid_buf,
.length = sizeof(guid_buf),
};
TDB_DATA key = {
.dptr = b.data,
.dsize = b.length,
};
bool exists;
ndr_err = ndr_push_struct_into_fixed_blob(&b, guid,
(ndr_push_flags_fn_t)ndr_push_GUID);
if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
return WERR_DS_DRA_INTERNAL_ERROR;
}
exists = dbwrap_exists(obj_cache, key);
if (!exists) {
return WERR_OBJECT_NOT_FOUND;
}
return WERR_OBJECT_NAME_EXISTS;
}
/**
* Copies the la_list specified into a sorted array, ready to be sent in a
* GetNCChanges response.
*/
static WERROR getncchanges_get_sorted_array(const struct drsuapi_DsReplicaLinkedAttribute *la_list,
const uint32_t link_count,
struct ldb_context *sam_ctx,
TALLOC_CTX *mem_ctx,
const struct dsdb_schema *schema,
struct la_for_sorting **ret_array)
{
int j;
struct la_for_sorting *guid_array;
WERROR werr = WERR_OK;
*ret_array = NULL;
guid_array = talloc_array(mem_ctx, struct la_for_sorting, link_count);
if (guid_array == NULL) {
DEBUG(0, ("Out of memory allocating %u linked attributes for sorting\n", link_count));
return WERR_NOT_ENOUGH_MEMORY;
}
for (j = 0; j < link_count; j++) {
/* we need to get the target GUIDs to compare */
struct dsdb_dn *dn;
const struct drsuapi_DsReplicaLinkedAttribute *la = &la_list[j];
const struct dsdb_attribute *schema_attrib;
const struct ldb_val *target_guid;
DATA_BLOB source_guid;
TALLOC_CTX *frame = talloc_stackframe();
NTSTATUS status;
schema_attrib = dsdb_attribute_by_attributeID_id(schema, la->attid);
werr = dsdb_dn_la_from_blob(sam_ctx, schema_attrib, schema, frame, la->value.blob, &dn);
if (!W_ERROR_IS_OK(werr)) {
DEBUG(0,(__location__ ": Bad la blob in sort\n"));
TALLOC_FREE(frame);
return werr;
}
/* Extract the target GUID in NDR form */
target_guid = ldb_dn_get_extended_component(dn->dn, "GUID");
if (target_guid == NULL
|| target_guid->length != sizeof(guid_array[0].target_guid)) {
status = NT_STATUS_OBJECT_NAME_NOT_FOUND;
} else {
/* Repack the source GUID as NDR for sorting */
status = GUID_to_ndr_blob(&la->identifier->guid,
frame,
&source_guid);
}
if (!NT_STATUS_IS_OK(status)
|| source_guid.length != sizeof(guid_array[0].source_guid)) {
DEBUG(0,(__location__ ": Bad la guid in sort\n"));
TALLOC_FREE(frame);
return ntstatus_to_werror(status);
}
guid_array[j].link = &la_list[j];
memcpy(guid_array[j].target_guid, target_guid->data,
sizeof(guid_array[j].target_guid));
memcpy(guid_array[j].source_guid, source_guid.data,
sizeof(guid_array[j].source_guid));
TALLOC_FREE(frame);
}
TYPESAFE_QSORT(guid_array, link_count, linked_attribute_compare);
*ret_array = guid_array;
return werr;
}
/**
* Adds any ancestor/parent objects of the child_obj specified.
* This is needed when the GET_ANC flag is specified in the request.
* @param new_objs if parents are added, this gets updated to point to a chain
* of parent objects (with the parents first and the child last)
*/
static WERROR getncchanges_add_ancestors(const struct GUID *parent_object_guid,
struct ldb_dn *child_dn,
TALLOC_CTX *mem_ctx,
struct ldb_context *sam_ctx,
struct drsuapi_getncchanges_state *getnc_state,
struct dsdb_schema *schema,
DATA_BLOB *session_key,
struct drsuapi_DsGetNCChangesRequest10 *req10,
uint32_t *local_pas,
struct ldb_dn *machine_dn,
struct drsuapi_DsReplicaObjectListItemEx **new_objs)
{
int ret;
const struct GUID *next_anc_guid = NULL;
WERROR werr = WERR_OK;
static const char * const msg_attrs[] = {
"*",
"nTSecurityDescriptor",
"parentGUID",
"replPropertyMetaData",
DSDB_SECRET_ATTRIBUTES,
NULL };
next_anc_guid = parent_object_guid;
while (next_anc_guid != NULL) {
struct drsuapi_DsReplicaObjectListItemEx *anc_obj = NULL;
struct ldb_message *anc_msg = NULL;
struct ldb_result *anc_res = NULL;
struct ldb_dn *anc_dn = NULL;
/*
* For the GET_ANC case (but not the 'send NC root
* first' case), don't send an object twice.
*
* (If we've sent the object, then we've also sent all
* its parents as well)
*/
if (getnc_state->obj_cache) {
werr = dcesrv_drsuapi_obj_cache_exists(getnc_state->obj_cache,
next_anc_guid);
if (W_ERROR_EQUAL(werr, WERR_OBJECT_NAME_EXISTS)) {
return WERR_OK;
}
if (W_ERROR_IS_OK(werr)) {
return WERR_INTERNAL_ERROR;
}
if (!W_ERROR_EQUAL(werr, WERR_OBJECT_NOT_FOUND)) {
return werr;
}
}
anc_obj = talloc_zero(mem_ctx,
struct drsuapi_DsReplicaObjectListItemEx);
if (anc_obj == NULL) {
return WERR_NOT_ENOUGH_MEMORY;
}
anc_dn = ldb_dn_new_fmt(anc_obj, sam_ctx, "",
GUID_string(anc_obj, next_anc_guid));
if (anc_dn == NULL) {
return WERR_NOT_ENOUGH_MEMORY;
}
ret = drsuapi_search_with_extended_dn(sam_ctx, anc_obj,
&anc_res, anc_dn,
LDB_SCOPE_BASE,
msg_attrs, NULL);
if (ret != LDB_SUCCESS) {
const char *anc_str = NULL;
const char *obj_str = NULL;
anc_str = ldb_dn_get_extended_linearized(anc_obj,
anc_dn,
1);
obj_str = ldb_dn_get_extended_linearized(anc_obj,
child_dn,
1);
DBG_ERR("getncchanges: failed to fetch ANC "
"DN %s for DN %s - %s\n",
anc_str, obj_str, ldb_errstring(sam_ctx));
return WERR_DS_DRA_INCONSISTENT_DIT;
}
anc_msg = anc_res->msgs[0];
werr = get_nc_changes_build_object(anc_obj, anc_msg,
sam_ctx,
getnc_state,
schema, session_key,
req10,
false, /* force_object_return */
local_pas,
machine_dn,
next_anc_guid);
if (!W_ERROR_IS_OK(werr)) {
return werr;
}
/*
* Regardless of whether we actually use it or not,
* we add it to the cache so we don't look at it again
*
* The only time we are here without
* getnc_state->obj_cache is for the forced addition
* of the NC root to the start of the reply, this we
* want to add each and every call..
*/
if (getnc_state->obj_cache) {
werr = dcesrv_drsuapi_obj_cache_add(getnc_state->obj_cache,
next_anc_guid);
if (!W_ERROR_IS_OK(werr)) {
return werr;
}
}
/*
* Any ancestors which are below the highwatermark
* or uptodateness_vector shouldn't be added,
* but we still look further up the
* tree for ones which have been changed recently.
*/
if (anc_obj->meta_data_ctr != NULL) {
/*
* prepend the parent to the list so that the client-side
* adds the parent object before it adds the children
*/
anc_obj->next_object = *new_objs;
*new_objs = anc_obj;
}
anc_msg = NULL;
TALLOC_FREE(anc_res);
TALLOC_FREE(anc_dn);
/*
* We may need to resolve more parents...
*/
next_anc_guid = anc_obj->parent_object_guid;
}
return werr;
}
/**
* Adds a list of new objects into the current chunk of replication data to send
*/
static void getncchanges_chunk_add_objects(struct getncchanges_repl_chunk *repl_chunk,
struct drsuapi_DsReplicaObjectListItemEx *obj_list)
{
struct drsuapi_DsReplicaObjectListItemEx *obj;
/*
* We track the last object added to the replication chunk, so just add
* the new object-list onto the end
*/
if (repl_chunk->object_list == NULL) {
repl_chunk->object_list = obj_list;
} else {
repl_chunk->last_object->next_object = obj_list;
}
for (obj = obj_list; obj != NULL; obj = obj->next_object) {
repl_chunk->object_count += 1;
/*
* Remember the last object in the response - we'll use this to
* link the next object(s) processed onto the existing list
*/
if (obj->next_object == NULL) {
repl_chunk->last_object = obj;
}
}
}
/**
* Gets the object to send, packed into an RPC struct ready to send. This also
* adds the object to the object cache, and adds any ancestors (if needed).
* @param msg - DB search result for the object to add
* @param guid - GUID of the object to add
* @param ret_obj_list - returns the object ready to be sent (in a list, along
* with any ancestors that might be needed). NULL if nothing to send.
*/
static WERROR getncchanges_get_obj_to_send(const struct ldb_message *msg,
TALLOC_CTX *mem_ctx,
struct ldb_context *sam_ctx,
struct drsuapi_getncchanges_state *getnc_state,
struct dsdb_schema *schema,
DATA_BLOB *session_key,
struct drsuapi_DsGetNCChangesRequest10 *req10,
bool force_object_return,
uint32_t *local_pas,
struct ldb_dn *machine_dn,
const struct GUID *guid,
struct drsuapi_DsReplicaObjectListItemEx **ret_obj_list)
{
struct drsuapi_DsReplicaObjectListItemEx *obj;
WERROR werr;
*ret_obj_list = NULL;
obj = talloc_zero(mem_ctx, struct drsuapi_DsReplicaObjectListItemEx);
W_ERROR_HAVE_NO_MEMORY(obj);
werr = get_nc_changes_build_object(obj, msg, sam_ctx, getnc_state,
schema, session_key, req10,
force_object_return,
local_pas, machine_dn, guid);
if (!W_ERROR_IS_OK(werr)) {
return werr;
}
/*
* The object may get filtered out by the UTDV's USN and not actually
* sent, in which case there's nothing more to do here
*/
if (obj->meta_data_ctr == NULL) {
TALLOC_FREE(obj);
return WERR_OK;
}
if (getnc_state->obj_cache != NULL) {
werr = dcesrv_drsuapi_obj_cache_add(getnc_state->obj_cache,
guid);
if (!W_ERROR_IS_OK(werr)) {
return werr;
}
}
*ret_obj_list = obj;
/*
* If required, also add any ancestors that the client may need to know
* about before it can resolve this object. These get prepended to the
* ret_obj_list so the client adds them first.
*
* We allow this to be disabled to permit testing of a
* client-side fallback for the broken behaviour in Samba 4.5
* and earlier.
*/
if (getnc_state->is_get_anc
&& !getnc_state->broken_samba_4_5_get_anc_emulation) {
werr = getncchanges_add_ancestors(obj->parent_object_guid,
msg->dn, mem_ctx,
sam_ctx, getnc_state,
schema, session_key,
req10, local_pas,
machine_dn, ret_obj_list);
}
return werr;
}
/**
* Returns the number of links that are waiting to be sent
*/
static uint32_t getncchanges_chunk_links_pending(struct getncchanges_repl_chunk *repl_chunk,
struct drsuapi_getncchanges_state *getnc_state)
{
uint32_t links_to_send = 0;
if (getnc_state->is_get_tgt) {
/*
* when the GET_TGT flag is set, only include the linked
* attributes whose target object has already been checked
* (i.e. they're ready to send).
*/
if (repl_chunk->tgt_la_count > getnc_state->la_idx) {
links_to_send = (repl_chunk->tgt_la_count -
getnc_state->la_idx);
}
} else {
links_to_send = getnc_state->la_count - getnc_state->la_idx;
}
return links_to_send;
}
/**
* Returns the max number of links that will fit in the current replication chunk
*/
static uint32_t getncchanges_chunk_max_links(struct getncchanges_repl_chunk *repl_chunk)
{
uint32_t max_links = 0;
if (repl_chunk->max_links != DEFAULT_MAX_LINKS ||
repl_chunk->max_objects != DEFAULT_MAX_OBJECTS) {
/*
* We're using non-default settings, so don't try to adjust
* them, just trust the user has configured decent values
*/
max_links = repl_chunk->max_links;
} else if (repl_chunk->max_links > repl_chunk->object_count) {
/*
* This is just an approximate guess to avoid overfilling the
* replication chunk. It's the logic we've used historically.
* E.g. if we've already sent 1000 objects, then send 1000 fewer
* links. For comparison, the max that Windows seems to send is
* ~2700 links and ~250 objects (although this may vary based
* on timeouts)
*/
max_links = repl_chunk->max_links - repl_chunk->object_count;
}
return max_links;
}
/**
* Returns true if the current GetNCChanges() call has taken longer than its
* allotted time. This prevents the client from timing out.
*/
static bool getncchanges_chunk_timed_out(struct getncchanges_repl_chunk *repl_chunk)
{
return (time(NULL) - repl_chunk->start > repl_chunk->max_wait);
}
/**
* Returns true if the current chunk of replication data has reached the
* max_objects and/or max_links thresholds.
*/
static bool getncchanges_chunk_is_full(struct getncchanges_repl_chunk *repl_chunk,
struct drsuapi_getncchanges_state *getnc_state)
{
bool chunk_full = false;
uint32_t links_to_send;
uint32_t chunk_limit;
/* check if the current chunk is already full with objects */
if (repl_chunk->object_count >= repl_chunk->max_objects) {
chunk_full = true;
} else if (repl_chunk->object_count > 0 &&
getncchanges_chunk_timed_out(repl_chunk)) {
/*
* We've exceeded our allotted time building this chunk,
* and we have at least one object to send back to the client
*/
chunk_full = true;
} else if (repl_chunk->immediate_link_sync) {
/* check if the chunk is already full with links */
links_to_send = getncchanges_chunk_links_pending(repl_chunk,
getnc_state);
chunk_limit = getncchanges_chunk_max_links(repl_chunk);
/*
* The chunk is full if we've got more links to send than will
* fit in one chunk
*/
if (links_to_send > 0 && chunk_limit <= links_to_send) {
chunk_full = true;
}
}
return chunk_full;
}
/**
* Goes through any new linked attributes and checks that the target object
* will be known to the client, i.e. we've already sent it in an replication
* chunk. If not, then it adds the target object to the current replication
* chunk. This is only done when the client specifies DRS_GET_TGT.
*/
static WERROR getncchanges_chunk_add_la_targets(struct getncchanges_repl_chunk *repl_chunk,
struct drsuapi_getncchanges_state *getnc_state,
uint32_t start_la_index,
TALLOC_CTX *mem_ctx,
struct ldb_context *sam_ctx,
struct dsdb_schema *schema,
DATA_BLOB *session_key,
struct drsuapi_DsGetNCChangesRequest10 *req10,
uint32_t *local_pas,
struct ldb_dn *machine_dn)
{
int ret;
uint32_t i;
uint32_t max_la_index;
uint32_t max_links;
uint32_t target_count = 0;
WERROR werr = WERR_OK;
static const char * const msg_attrs[] = {
"*",
"nTSecurityDescriptor",
"parentGUID",
"replPropertyMetaData",
DSDB_SECRET_ATTRIBUTES,
NULL };
/*
* A object can potentially link to thousands of targets. Only bother
* checking as many targets as will fit into the current response
*/
max_links = getncchanges_chunk_max_links(repl_chunk);
max_la_index = MIN(getnc_state->la_count,
start_la_index + max_links);
/* loop through any linked attributes to check */
for (i = start_la_index;
(i < max_la_index &&
!getncchanges_chunk_is_full(repl_chunk, getnc_state));
i++) {
struct GUID target_guid;
struct drsuapi_DsReplicaObjectListItemEx *new_objs = NULL;
const struct drsuapi_DsReplicaLinkedAttribute *la;
struct ldb_result *msg_res;
struct ldb_dn *search_dn;
TALLOC_CTX *tmp_ctx;
struct dsdb_dn *dn;
const struct dsdb_attribute *schema_attrib;
NTSTATUS status;
bool same_nc;
la = &getnc_state->la_list[i];
tmp_ctx = talloc_new(mem_ctx);
/*
* Track what linked attribute targets we've checked. We might
* not have time to check them all, so we should only send back
* the ones we've actually checked.
*/
repl_chunk->tgt_la_count = i + 1;
/* get the GUID of the linked attribute's target object */
schema_attrib = dsdb_attribute_by_attributeID_id(schema,
la->attid);
werr = dsdb_dn_la_from_blob(sam_ctx, schema_attrib, schema,
tmp_ctx, la->value.blob, &dn);
if (!W_ERROR_IS_OK(werr)) {
DEBUG(0,(__location__ ": Bad la blob\n"));
return werr;
}
status = dsdb_get_extended_dn_guid(dn->dn, &target_guid, "GUID");
if (!NT_STATUS_IS_OK(status)) {
return ntstatus_to_werror(status);
}
/*
* if the target isn't in the cache, then the client
* might not know about it, so send the target now
*/
werr = dcesrv_drsuapi_obj_cache_exists(getnc_state->obj_cache,
&target_guid);
if (W_ERROR_EQUAL(werr, WERR_OBJECT_NAME_EXISTS)) {
/* target already sent, nothing to do */
TALLOC_FREE(tmp_ctx);
continue;
}
same_nc = dsdb_objects_have_same_nc(sam_ctx, tmp_ctx, dn->dn,
getnc_state->ncRoot_dn);
/* don't try to fetch target objects from another partition */
if (!same_nc) {
TALLOC_FREE(tmp_ctx);
continue;
}
search_dn = ldb_dn_new_fmt(tmp_ctx, sam_ctx, "",
GUID_string(tmp_ctx, &target_guid));
W_ERROR_HAVE_NO_MEMORY(search_dn);
ret = drsuapi_search_with_extended_dn(sam_ctx, tmp_ctx,
&msg_res, search_dn,
LDB_SCOPE_BASE,
msg_attrs, NULL);
/*
* Don't fail the replication if we can't find the target.
* This could happen for a one-way linked attribute, if the
* target is deleted and then later expunged (thus, the source
* object can be left with a hanging link). Continue to send
* the the link (the client-side has already tried once with
* GET_TGT, so it should just end up ignoring it).
*/
if (ret == LDB_ERR_NO_SUCH_OBJECT) {
DBG_WARNING("Encountered unknown link target DN %s\n",
ldb_dn_get_extended_linearized(tmp_ctx, dn->dn, 1));
TALLOC_FREE(tmp_ctx);
continue;
} else if (ret != LDB_SUCCESS) {
DBG_ERR("Failed to fetch link target DN %s - %s\n",
ldb_dn_get_extended_linearized(tmp_ctx, dn->dn, 1),
ldb_errstring(sam_ctx));
return WERR_DS_DRA_INCONSISTENT_DIT;
}
/*
* Construct an object, ready to send (this will include
* the object's ancestors as well, if GET_ANC is set)
*/
werr = getncchanges_get_obj_to_send(msg_res->msgs[0], mem_ctx,
sam_ctx, getnc_state,
schema, session_key, req10,
false, local_pas,
machine_dn, &target_guid,
&new_objs);
if (!W_ERROR_IS_OK(werr)) {
return werr;
}
if (new_objs != NULL) {
target_count++;
getncchanges_chunk_add_objects(repl_chunk, new_objs);
}
TALLOC_FREE(tmp_ctx);
}
if (target_count > 0) {
DEBUG(3, ("GET_TGT: checked %u link-attrs, added %u target objs\n",
i - start_la_index, target_count));
}
return WERR_OK;
}
/**
* Creates a helper struct used for building a chunk of replication data,
* i.e. used over a single call to dcesrv_drsuapi_DsGetNCChanges().
*/
static struct getncchanges_repl_chunk * getncchanges_chunk_new(TALLOC_CTX *mem_ctx,
struct dcesrv_call_state *dce_call,
struct drsuapi_DsGetNCChangesRequest10 *req10)
{
struct getncchanges_repl_chunk *repl_chunk;
repl_chunk = talloc_zero(mem_ctx, struct getncchanges_repl_chunk);
repl_chunk->start = time(NULL);
repl_chunk->max_objects = lpcfg_parm_int(dce_call->conn->dce_ctx->lp_ctx, NULL,
"drs", "max object sync",
DEFAULT_MAX_OBJECTS);
/*
* The client control here only applies in normal replication, not extended
* operations, which return a fixed set, even if the caller
* sets max_object_count == 0
*/
if (req10->extended_op == DRSUAPI_EXOP_NONE) {
/*
* use this to force single objects at a time, which is useful
* for working out what object is giving problems
*/
if (req10->max_object_count < repl_chunk->max_objects) {
repl_chunk->max_objects = req10->max_object_count;
}
}
repl_chunk->max_links =
lpcfg_parm_int(dce_call->conn->dce_ctx->lp_ctx, NULL,
"drs", "max link sync",
DEFAULT_MAX_LINKS);
repl_chunk->immediate_link_sync =
lpcfg_parm_bool(dce_call->conn->dce_ctx->lp_ctx, NULL,
"drs", "immediate link sync", false);
/*
* Maximum time that we can spend in a getncchanges
* in order to avoid timeout of the other part.
* 10 seconds by default.
*/
repl_chunk->max_wait = lpcfg_parm_int(dce_call->conn->dce_ctx->lp_ctx,
NULL, "drs", "max work time", 10);
return repl_chunk;
}
/*
drsuapi_DsGetNCChanges
see MS-DRSR 4.1.10.5.2 for basic logic of this function
*/
WERROR dcesrv_drsuapi_DsGetNCChanges(struct dcesrv_call_state *dce_call, TALLOC_CTX *mem_ctx,
struct drsuapi_DsGetNCChanges *r)
{
struct auth_session_info *session_info =
dcesrv_call_session_info(dce_call);
struct imessaging_context *imsg_ctx =
dcesrv_imessaging_context(dce_call->conn);
struct drsuapi_DsReplicaObjectIdentifier *untrusted_ncRoot;
int ret;
uint32_t i, k;
struct dsdb_schema *schema;
struct drsuapi_DsReplicaOIDMapping_Ctr *ctr;
struct getncchanges_repl_chunk *repl_chunk;
NTSTATUS status;
DATA_BLOB session_key;
WERROR werr;
struct dcesrv_handle *h;
struct drsuapi_bind_state *b_state;
struct drsuapi_getncchanges_state *getnc_state = NULL;
struct drsuapi_DsGetNCChangesRequest10 *req10;
uint32_t options;
uint32_t link_count = 0;
struct ldb_dn *search_dn = NULL;
bool am_rodc;
enum security_user_level security_level;
struct ldb_context *sam_ctx;
struct dom_sid *user_sid;
bool is_secret_request;
bool is_gc_pas_request;
struct drsuapi_changed_objects *changes;
bool has_get_all_changes = false;
struct GUID invocation_id;
static const struct drsuapi_DsReplicaLinkedAttribute no_linked_attr;
struct dsdb_schema_prefixmap *pfm_remote = NULL;
bool full = true;
uint32_t *local_pas = NULL;
struct ldb_dn *machine_dn = NULL; /* Only used for REPL SECRET EXOP */
DCESRV_PULL_HANDLE_WERR(h, r->in.bind_handle, DRSUAPI_BIND_HANDLE);
b_state = h->data;
/* sam_ctx_system is not present for non-administrator users */
sam_ctx = b_state->sam_ctx_system?b_state->sam_ctx_system:b_state->sam_ctx;
invocation_id = *(samdb_ntds_invocation_id(sam_ctx));
*r->out.level_out = 6;
r->out.ctr->ctr6.linked_attributes_count = 0;
r->out.ctr->ctr6.linked_attributes = discard_const_p(struct drsuapi_DsReplicaLinkedAttribute, &no_linked_attr);
r->out.ctr->ctr6.object_count = 0;
r->out.ctr->ctr6.nc_object_count = 0;
r->out.ctr->ctr6.more_data = false;
r->out.ctr->ctr6.uptodateness_vector = NULL;
r->out.ctr->ctr6.source_dsa_guid = *(samdb_ntds_objectGUID(sam_ctx));
r->out.ctr->ctr6.source_dsa_invocation_id = *(samdb_ntds_invocation_id(sam_ctx));
r->out.ctr->ctr6.first_object = NULL;
/* Check request revision.
*/
switch (r->in.level) {
case 8:
req10 = getncchanges_map_req8(mem_ctx, &r->in.req->req8);
if (req10 == NULL) {
return WERR_NOT_ENOUGH_MEMORY;
}
break;
case 10:
req10 = &r->in.req->req10;
break;
default:
DEBUG(0,(__location__ ": Request for DsGetNCChanges with unsupported level %u\n",
r->in.level));
return WERR_REVISION_MISMATCH;
}
repl_chunk = getncchanges_chunk_new(mem_ctx, dce_call, req10);
if (repl_chunk == NULL) {
return WERR_NOT_ENOUGH_MEMORY;
}
/* a RODC doesn't allow for any replication */
ret = samdb_rodc(sam_ctx, &am_rodc);
if (ret == LDB_SUCCESS && am_rodc) {
DEBUG(0,(__location__ ": DsGetNCChanges attempt on RODC\n"));
return WERR_DS_DRA_SOURCE_DISABLED;
}
/*
* Help our tests pass by pre-checking the
* destination_dsa_guid before the NC permissions. Info on
* valid DSA GUIDs is not sensitive so this isn't a leak
*/
switch (req10->extended_op) {
case DRSUAPI_EXOP_FSMO_REQ_ROLE:
case DRSUAPI_EXOP_FSMO_RID_ALLOC:
case DRSUAPI_EXOP_FSMO_RID_REQ_ROLE:
case DRSUAPI_EXOP_FSMO_REQ_PDC:
case DRSUAPI_EXOP_FSMO_ABANDON_ROLE:
{
const char *attrs[] = { NULL };
ret = samdb_get_ntds_obj_by_guid(mem_ctx,
sam_ctx,
&req10->destination_dsa_guid,
attrs,
NULL);
if (ret == LDB_ERR_NO_SUCH_OBJECT) {
/*
* Error out with an EXOP error but success at
* the top level return value
*/
r->out.ctr->ctr6.extended_ret = DRSUAPI_EXOP_ERR_UNKNOWN_CALLER;
return WERR_OK;
} else if (ret != LDB_SUCCESS) {
return WERR_DS_DRA_INTERNAL_ERROR;
}
break;
}
case DRSUAPI_EXOP_REPL_SECRET:
case DRSUAPI_EXOP_REPL_OBJ:
case DRSUAPI_EXOP_NONE:
break;
}
/* Perform access checks. */
untrusted_ncRoot = req10->naming_context;
if (untrusted_ncRoot == NULL) {
DEBUG(0,(__location__ ": Request for DsGetNCChanges with no NC\n"));
return WERR_DS_DRA_INVALID_PARAMETER;
}
if (samdb_ntds_options(sam_ctx, &options) != LDB_SUCCESS) {
return WERR_DS_DRA_INTERNAL_ERROR;
}
if ((options & DS_NTDSDSA_OPT_DISABLE_OUTBOUND_REPL) &&
!(req10->replica_flags & DRSUAPI_DRS_SYNC_FORCED)) {
return WERR_DS_DRA_SOURCE_DISABLED;
}
user_sid = &session_info->security_token->sids[PRIMARY_USER_SID_INDEX];
/*
* all clients must have GUID_DRS_GET_CHANGES. This finds the
* actual NC root of the given value and checks that, allowing
* REPL_OBJ to work safely
*/
werr = drs_security_access_check_nc_root(sam_ctx,
mem_ctx,
session_info->security_token,
req10->naming_context,
GUID_DRS_GET_CHANGES);
if (W_ERROR_EQUAL(werr, WERR_DS_DRA_BAD_NC)) {
/*
* These extended operations need a different error if
* the supplied DN can't be found
*/
switch (req10->extended_op) {
case DRSUAPI_EXOP_REPL_OBJ:
case DRSUAPI_EXOP_REPL_SECRET:
return WERR_DS_DRA_BAD_DN;
default:
return werr;
}
}
if (!W_ERROR_IS_OK(werr)) {
return werr;
}
if (dsdb_functional_level(sam_ctx) >= DS_DOMAIN_FUNCTION_2008) {
full = req10->partial_attribute_set == NULL &&
req10->partial_attribute_set_ex == NULL;
} else {
full = (options & DRSUAPI_DRS_WRIT_REP) != 0;
}
werr = dsdb_schema_pfm_from_drsuapi_pfm(&req10->mapping_ctr, true,
mem_ctx, &pfm_remote, NULL);
/* We were supplied a partial attribute set, without the prefix map! */
if (!full && !W_ERROR_IS_OK(werr)) {
if (req10->mapping_ctr.num_mappings == 0) {
/*
* Despite the fact MS-DRSR specifies that this shouldn't
* happen, Windows RODCs will in fact not provide a prefixMap.
*/
DEBUG(5,(__location__ ": Failed to provide a remote prefixMap,"
" falling back to local prefixMap\n"));
} else {
DEBUG(0,(__location__ ": Failed to decode remote prefixMap: %s\n",
win_errstr(werr)));
return werr;
}
}
/* allowed if the GC PAS and client has
GUID_DRS_GET_FILTERED_ATTRIBUTES */
werr = dcesrv_drsuapi_is_gc_pas_request(b_state, req10, pfm_remote, &is_gc_pas_request);
if (!W_ERROR_IS_OK(werr)) {
return werr;
}
if (is_gc_pas_request) {
werr = drs_security_access_check_nc_root(sam_ctx,
mem_ctx,
session_info->security_token,
req10->naming_context,
GUID_DRS_GET_FILTERED_ATTRIBUTES);
if (W_ERROR_IS_OK(werr)) {
goto allowed;
}
}
werr = dcesrv_drsuapi_is_reveal_secrets_request(b_state, req10,
pfm_remote,
&is_secret_request);
if (!W_ERROR_IS_OK(werr)) {
return werr;
}
if (is_secret_request) {
werr = drs_security_access_check_nc_root(sam_ctx,
mem_ctx,
session_info->security_token,
req10->naming_context,
GUID_DRS_GET_ALL_CHANGES);
if (!W_ERROR_IS_OK(werr)) {
/* Only bail if this is not a EXOP_REPL_SECRET */
if (req10->extended_op != DRSUAPI_EXOP_REPL_SECRET) {
return werr;
}
} else {
has_get_all_changes = true;
}
}
allowed:
/* for non-administrator replications, check that they have
given the correct source_dsa_invocation_id */
security_level = security_session_user_level(session_info,
samdb_domain_sid(sam_ctx));
if (security_level == SECURITY_RO_DOMAIN_CONTROLLER) {
if (req10->replica_flags & DRSUAPI_DRS_WRIT_REP) {
/* we rely on this flag being unset for RODC requests */
req10->replica_flags &= ~DRSUAPI_DRS_WRIT_REP;
}
}
if (req10->replica_flags & DRSUAPI_DRS_FULL_SYNC_PACKET) {
/* Ignore the _in_ uptodateness vector*/
req10->uptodateness_vector = NULL;
}
if (GUID_all_zero(&req10->source_dsa_invocation_id)) {
req10->source_dsa_invocation_id = invocation_id;
}
if (!GUID_equal(&req10->source_dsa_invocation_id, &invocation_id)) {
/*
* The given highwatermark is only valid relative to the
* specified source_dsa_invocation_id.
*/
ZERO_STRUCT(req10->highwatermark);
}
/*
* An extended operation is "special single-response cycle"
* per MS-DRSR 4.1.10.1.1 "Start and Finish" so we don't need
* to guess if this is a continuation of any long-term
* state.
*
* Otherwise, maintain (including marking as stale, which is
* what the below is for) the replication state.
*
* Note that point 5 "The server implementation MAY declare
* the supplied values ... as too stale to use." would allow
* resetting the state at almost any point, Microsoft Azure AD
* Connect will switch back and forth between a REPL_OBJ and a
* full replication, so we must not reset the statue during
* extended operations.
*/
if (req10->extended_op == DRSUAPI_EXOP_NONE &&
b_state->getncchanges_full_repl_state != NULL) {
/*
* Knowing that this is not an extended operation, we
* can access (and validate) the full replication
* state
*/
getnc_state = b_state->getncchanges_full_repl_state;
}
/* see if a previous replication has been abandoned */
if (getnc_state != NULL) {
struct ldb_dn *new_dn;
ret = drs_ObjectIdentifier_to_dn_and_nc_root(getnc_state,
sam_ctx,
untrusted_ncRoot,
&new_dn,
NULL);
if (ret != LDB_SUCCESS) {
/*
* This can't fail as we have done this above
* implicitly but not got the DN out, but
* print a good error message regardless just
* in case.
*/
DBG_ERR("Bad DN '%s' as Naming Context for GetNCChanges: %s\n",
drs_ObjectIdentifier_to_debug_string(mem_ctx, untrusted_ncRoot),
ldb_strerror(ret));
return WERR_DS_DRA_INVALID_PARAMETER;
}
if (ldb_dn_compare(new_dn, getnc_state->ncRoot_dn) != 0) {
DEBUG(0,(__location__ ": DsGetNCChanges 2nd replication on different DN %s %s (last_dn %s)\n",
ldb_dn_get_linearized(new_dn),
ldb_dn_get_linearized(getnc_state->ncRoot_dn),
ldb_dn_get_linearized(getnc_state->last_dn)));
TALLOC_FREE(getnc_state);
b_state->getncchanges_full_repl_state = NULL;
}
}
if (getnc_state != NULL) {
ret = drsuapi_DsReplicaHighWaterMark_cmp(&getnc_state->last_hwm,
&req10->highwatermark);
if (ret != 0) {
DEBUG(0,(__location__ ": DsGetNCChanges 2nd replication "
"on DN %s %s highwatermark (last_dn %s)\n",
ldb_dn_get_linearized(getnc_state->ncRoot_dn),
(ret > 0) ? "older" : "newer",
ldb_dn_get_linearized(getnc_state->last_dn)));
TALLOC_FREE(getnc_state);
b_state->getncchanges_full_repl_state = NULL;
}
}
/*
* This is either a new replication cycle, or an extended
* operation. A new cycle is triggered above by the
* TALLOC_FREE() which sets getnc_state to NULL.
*/
if (getnc_state == NULL) {
struct ldb_result *res = NULL;
const char *attrs[] = {
"instanceType",
"objectGuID",
NULL
};
uint32_t nc_instanceType;
struct ldb_dn *ncRoot_dn;
ret = drs_ObjectIdentifier_to_dn_and_nc_root(mem_ctx,
sam_ctx,
untrusted_ncRoot,
&ncRoot_dn,
NULL);
if (ret != LDB_SUCCESS) {
DBG_ERR("Bad DN '%s' as Naming Context or EXOP DN for GetNCChanges: %s\n",
drs_ObjectIdentifier_to_debug_string(mem_ctx, untrusted_ncRoot),
ldb_strerror(ret));
return WERR_DS_DRA_BAD_DN;
}
ret = dsdb_search_dn(sam_ctx, mem_ctx, &res,
ncRoot_dn, attrs,
DSDB_SEARCH_SHOW_DELETED |
DSDB_SEARCH_SHOW_RECYCLED);
if (ret != LDB_SUCCESS) {
DBG_WARNING("Failed to find ncRoot_dn %s\n",
ldb_dn_get_linearized(ncRoot_dn));
return WERR_DS_DRA_BAD_DN;
}
nc_instanceType = ldb_msg_find_attr_as_int(res->msgs[0],
"instanceType",
0);
if (req10->extended_op != DRSUAPI_EXOP_NONE) {
r->out.ctr->ctr6.extended_ret = DRSUAPI_EXOP_ERR_SUCCESS;
}
/*
* This is the first replication cycle and it is
* a good place to handle extended operations
*
* FIXME: we don't fully support extended operations yet
*/
switch (req10->extended_op) {
case DRSUAPI_EXOP_NONE:
if ((nc_instanceType & INSTANCE_TYPE_IS_NC_HEAD) == 0) {
const char *dn_str
= ldb_dn_get_linearized(ncRoot_dn);
DBG_NOTICE("Rejecting full replication on "
"not NC %s\n", dn_str);
return WERR_DS_CANT_FIND_EXPECTED_NC;
}
break;
case DRSUAPI_EXOP_FSMO_RID_ALLOC:
werr = getncchanges_rid_alloc(b_state, mem_ctx, req10, &r->out.ctr->ctr6, &search_dn);
W_ERROR_NOT_OK_RETURN(werr);
if (r->out.ctr->ctr6.extended_ret != DRSUAPI_EXOP_ERR_SUCCESS) {
return WERR_OK;
}
break;
case DRSUAPI_EXOP_REPL_SECRET:
werr = getncchanges_repl_secret(b_state, mem_ctx, req10,
user_sid,
&r->out.ctr->ctr6,
has_get_all_changes,
&machine_dn);
r->out.result = werr;
W_ERROR_NOT_OK_RETURN(werr);
break;
case DRSUAPI_EXOP_FSMO_REQ_ROLE:
werr = getncchanges_change_master(b_state, mem_ctx, req10, &r->out.ctr->ctr6);
W_ERROR_NOT_OK_RETURN(werr);
if (r->out.ctr->ctr6.extended_ret != DRSUAPI_EXOP_ERR_SUCCESS) {
return WERR_OK;
}
break;
case DRSUAPI_EXOP_FSMO_RID_REQ_ROLE:
werr = getncchanges_change_master(b_state, mem_ctx, req10, &r->out.ctr->ctr6);
W_ERROR_NOT_OK_RETURN(werr);
if (r->out.ctr->ctr6.extended_ret != DRSUAPI_EXOP_ERR_SUCCESS) {
return WERR_OK;
}
break;
case DRSUAPI_EXOP_FSMO_REQ_PDC:
werr = getncchanges_change_master(b_state, mem_ctx, req10, &r->out.ctr->ctr6);
W_ERROR_NOT_OK_RETURN(werr);
if (r->out.ctr->ctr6.extended_ret != DRSUAPI_EXOP_ERR_SUCCESS) {
return WERR_OK;
}
break;
case DRSUAPI_EXOP_REPL_OBJ:
werr = getncchanges_repl_obj(b_state, mem_ctx, req10, user_sid, &r->out.ctr->ctr6);
r->out.result = werr;
W_ERROR_NOT_OK_RETURN(werr);
break;
case DRSUAPI_EXOP_FSMO_ABANDON_ROLE:
DEBUG(0,(__location__ ": Request for DsGetNCChanges unsupported extended op 0x%x\n",
(unsigned)req10->extended_op));
return WERR_DS_DRA_NOT_SUPPORTED;
}
/*
* Initialize the state, initially for the remainder
* of this call (EXOPs)
*
* An extended operation is a "special single-response
* cycle" per MS-DRSR 4.1.10.1.1 "Start and Finish"
*
*/
getnc_state = talloc_zero(mem_ctx, struct drsuapi_getncchanges_state);
if (getnc_state == NULL) {
return WERR_NOT_ENOUGH_MEMORY;
}
if (req10->extended_op == DRSUAPI_EXOP_NONE) {
/*
* Promote the memory to being a store of
* long-term state that we will use over the
* replication cycle for full replication
* requests
*
* Store the state in a clearly named location
* for pulling back only during full
* replications
*/
b_state->getncchanges_full_repl_state
= talloc_steal(b_state, getnc_state);
}
getnc_state->ncRoot_dn = ncRoot_dn;
talloc_steal(getnc_state, ncRoot_dn);
getnc_state->ncRoot_guid = samdb_result_guid(res->msgs[0],
"objectGUID");
/* find out if we are to replicate Schema NC */
ret = ldb_dn_compare_base(ldb_get_schema_basedn(sam_ctx),
ncRoot_dn);
getnc_state->is_schema_nc = (0 == ret);
TALLOC_FREE(res);
}
/* we need the session key for encrypting password attributes */
status = dcesrv_auth_session_key(dce_call, &session_key);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(0,(__location__ ": Failed to get session key\n"));
return WERR_DS_DRA_INTERNAL_ERROR;
}
/*
TODO: MS-DRSR section 4.1.10.1.1
Work out if this is the start of a new cycle */
if (getnc_state->guids == NULL) {
const char *extra_filter;
struct ldb_result *search_res = NULL;
static const struct drsuapi_DsReplicaCursorCtrEx empty_udv;
const struct drsuapi_DsReplicaCursorCtrEx *udv = NULL;
extra_filter = lpcfg_parm_string(dce_call->conn->dce_ctx->lp_ctx, NULL, "drs", "object filter");
if (req10->extended_op == DRSUAPI_EXOP_NONE) {
if (req10->uptodateness_vector != NULL) {
udv = req10->uptodateness_vector;
} else {
udv = &empty_udv;
}
getnc_state->min_usn = req10->highwatermark.highest_usn;
for (i = 0; i < udv->count; i++) {
bool match;
const struct drsuapi_DsReplicaCursor *cur =
&udv->cursors[i];
match = GUID_equal(&invocation_id,
&cur->source_dsa_invocation_id);
if (!match) {
continue;
}
if (cur->highest_usn > getnc_state->min_usn) {
getnc_state->min_usn = cur->highest_usn;
}
break;
}
} else {
/* We do not want REPL_SECRETS or REPL_SINGLE to return empty-handed */
udv = &empty_udv;
getnc_state->min_usn = 0;
}
getnc_state->max_usn = getnc_state->min_usn;
getnc_state->final_udv = talloc_zero(getnc_state,
struct drsuapi_DsReplicaCursor2CtrEx);
if (getnc_state->final_udv == NULL) {
return WERR_NOT_ENOUGH_MEMORY;
}
werr = get_nc_changes_udv(sam_ctx, getnc_state->ncRoot_dn,
getnc_state->final_udv);
if (!W_ERROR_IS_OK(werr)) {
return werr;
}
if (req10->extended_op == DRSUAPI_EXOP_NONE) {
werr = getncchanges_collect_objects(b_state, mem_ctx,
getnc_state, req10,
search_dn, extra_filter,
&search_res);
} else {
werr = getncchanges_collect_objects_exop(b_state, mem_ctx,
getnc_state, req10,
&r->out.ctr->ctr6,
search_dn, extra_filter,
&search_res);
}
W_ERROR_NOT_OK_RETURN(werr);
/* extract out the GUIDs list */
getnc_state->num_records = search_res ? search_res->count : 0;
getnc_state->guids = talloc_array(getnc_state, struct GUID, getnc_state->num_records);
W_ERROR_HAVE_NO_MEMORY(getnc_state->guids);
changes = talloc_array(getnc_state,
struct drsuapi_changed_objects,
getnc_state->num_records);
W_ERROR_HAVE_NO_MEMORY(changes);
for (i=0; inum_records; i++) {
changes[i].dn = search_res->msgs[i]->dn;
changes[i].guid = samdb_result_guid(search_res->msgs[i], "objectGUID");
changes[i].usn = ldb_msg_find_attr_as_uint64(search_res->msgs[i], "uSNChanged", 0);
if (changes[i].usn > getnc_state->max_usn) {
getnc_state->max_usn = changes[i].usn;
}
if (req10->extended_op == DRSUAPI_EXOP_NONE &&
GUID_equal(&changes[i].guid, &getnc_state->ncRoot_guid))
{
getnc_state->send_nc_root_first = true;
}
}
if (req10->extended_op == DRSUAPI_EXOP_NONE) {
getnc_state->is_get_anc =
((req10->replica_flags & DRSUAPI_DRS_GET_ANC) != 0);
if (getnc_state->is_get_anc
&& lpcfg_parm_bool(dce_call->conn->dce_ctx->lp_ctx,
NULL,
"drs",
"broken_samba_4.5_get_anc_emulation",
false)) {
getnc_state->broken_samba_4_5_get_anc_emulation = true;
}
if (lpcfg_parm_bool(dce_call->conn->dce_ctx->lp_ctx,
NULL,
"drs",
"get_tgt_support",
true)) {
getnc_state->is_get_tgt =
((req10->more_flags & DRSUAPI_DRS_GET_TGT) != 0);
}
}
/* RID_ALLOC returns 3 objects in a fixed order */
if (req10->extended_op == DRSUAPI_EXOP_FSMO_RID_ALLOC) {
/* Do nothing */
} else if (getnc_state->broken_samba_4_5_get_anc_emulation) {
TYPESAFE_QSORT(changes,
getnc_state->num_records,
site_res_cmp_anc_order);
} else {
TYPESAFE_QSORT(changes,
getnc_state->num_records,
site_res_cmp_usn_order);
}
for (i=0; i < getnc_state->num_records; i++) {
getnc_state->guids[i] = changes[i].guid;
if (GUID_all_zero(&getnc_state->guids[i])) {
DEBUG(2,("getncchanges: bad objectGUID from %s\n",
ldb_dn_get_linearized(search_res->msgs[i]->dn)));
return WERR_DS_DRA_INTERNAL_ERROR;
}
}
getnc_state->final_hwm.tmp_highest_usn = getnc_state->max_usn;
getnc_state->final_hwm.reserved_usn = 0;
getnc_state->final_hwm.highest_usn = getnc_state->max_usn;
talloc_free(search_res);
talloc_free(changes);
/*
* when using GET_ANC or GET_TGT, cache the objects that have
* been already sent, to avoid sending them multiple times
*/
if (getnc_state->is_get_anc || getnc_state->is_get_tgt) {
DEBUG(3,("Using object cache, GET_ANC %u, GET_TGT %u\n",
getnc_state->is_get_anc,
getnc_state->is_get_tgt));
getnc_state->obj_cache = db_open_rbt(getnc_state);
if (getnc_state->obj_cache == NULL) {
return WERR_NOT_ENOUGH_MEMORY;
}
}
}
if (req10->uptodateness_vector) {
/* make sure its sorted */
TYPESAFE_QSORT(req10->uptodateness_vector->cursors,
req10->uptodateness_vector->count,
drsuapi_DsReplicaCursor_compare);
}
/* Prefix mapping */
schema = dsdb_get_schema(sam_ctx, mem_ctx);
if (!schema) {
DEBUG(0,("No schema in sam_ctx\n"));
return WERR_DS_DRA_INTERNAL_ERROR;
}
r->out.ctr->ctr6.naming_context = talloc(mem_ctx, struct drsuapi_DsReplicaObjectIdentifier);
if (r->out.ctr->ctr6.naming_context == NULL) {
return WERR_NOT_ENOUGH_MEMORY;
}
/*
* Match Windows and echo back the original values from the request, even if
* they say DummyDN for the string NC
*/
*r->out.ctr->ctr6.naming_context = *untrusted_ncRoot;
/* find the SID if there is one */
dsdb_find_sid_by_dn(sam_ctx, getnc_state->ncRoot_dn, &r->out.ctr->ctr6.naming_context->sid);
/* Set GUID */
r->out.ctr->ctr6.naming_context->guid = getnc_state->ncRoot_guid;
dsdb_get_oid_mappings_drsuapi(schema, true, mem_ctx, &ctr);
r->out.ctr->ctr6.mapping_ctr = *ctr;
r->out.ctr->ctr6.source_dsa_guid = *(samdb_ntds_objectGUID(sam_ctx));
r->out.ctr->ctr6.source_dsa_invocation_id = *(samdb_ntds_invocation_id(sam_ctx));
r->out.ctr->ctr6.old_highwatermark = req10->highwatermark;
r->out.ctr->ctr6.new_highwatermark = req10->highwatermark;
/*
* If the client has already set GET_TGT then we know they can handle
* receiving the linked attributes interleaved with the source objects
*/
if (getnc_state->is_get_tgt) {
repl_chunk->immediate_link_sync = true;
}
if (req10->partial_attribute_set != NULL) {
struct dsdb_syntax_ctx syntax_ctx;
uint32_t j = 0;
dsdb_syntax_ctx_init(&syntax_ctx, sam_ctx, schema);
syntax_ctx.pfm_remote = pfm_remote;
local_pas = talloc_array(b_state, uint32_t, req10->partial_attribute_set->num_attids);
for (j = 0; j < req10->partial_attribute_set->num_attids; j++) {
getncchanges_attid_remote_to_local(schema,
&syntax_ctx,
req10->partial_attribute_set->attids[j],
(enum drsuapi_DsAttributeId *)&local_pas[j],
NULL);
}
TYPESAFE_QSORT(local_pas,
req10->partial_attribute_set->num_attids,
uint32_t_ptr_cmp);
}
/*
* If we have the NC root in this replication, send it
* first regardless. However, don't bump the USN now,
* treat it as if it was sent early due to GET_ANC
*
* This is triggered for each call, so every page of responses
* gets the NC root as the first object, up to the point where
* it naturally occurs in the replication.
*/
if (getnc_state->send_nc_root_first) {
struct drsuapi_DsReplicaObjectListItemEx *new_objs = NULL;
werr = getncchanges_add_ancestors(&getnc_state->ncRoot_guid,
NULL, mem_ctx,
sam_ctx, getnc_state,
schema, &session_key,
req10, local_pas,
machine_dn, &new_objs);
if (!W_ERROR_IS_OK(werr)) {
return werr;
}
getncchanges_chunk_add_objects(repl_chunk, new_objs);
DEBUG(8,(__location__ ": replicating NC root %s\n",
ldb_dn_get_linearized(getnc_state->ncRoot_dn)));
}
/*
* Check in case we're still processing the links from an object in the
* previous chunk. We want to send the links (and any targets needed)
* before moving on to the next object.
*/
if (getnc_state->is_get_tgt) {
werr = getncchanges_chunk_add_la_targets(repl_chunk,
getnc_state,
getnc_state->la_idx,
mem_ctx, sam_ctx,
schema, &session_key,
req10, local_pas,
machine_dn);
if (!W_ERROR_IS_OK(werr)) {
return werr;
}
}
for (i=getnc_state->num_processed;
inum_records &&
!getncchanges_chunk_is_full(repl_chunk, getnc_state);
i++) {
struct drsuapi_DsReplicaObjectListItemEx *new_objs = NULL;
struct ldb_message *msg;
static const char * const msg_attrs[] = {
"*",
"nTSecurityDescriptor",
"parentGUID",
"replPropertyMetaData",
DSDB_SECRET_ATTRIBUTES,
NULL };
struct ldb_result *msg_res;
struct ldb_dn *msg_dn;
bool obj_already_sent = false;
TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);
uint32_t old_la_index;
/*
* Once we get to the 'natural' place to send the NC
* root, stop sending it at the front of each reply
* and make sure to suppress sending it now
*
* We don't just 'continue' here as we must send links
* and unlike Windows we want to update the
* tmp_highest_usn
*/
if (getnc_state->send_nc_root_first &&
GUID_equal(&getnc_state->guids[i], &getnc_state->ncRoot_guid))
{
getnc_state->send_nc_root_first = false;
obj_already_sent = true;
}
msg_dn = ldb_dn_new_fmt(tmp_ctx, sam_ctx, "",
GUID_string(tmp_ctx, &getnc_state->guids[i]));
W_ERROR_HAVE_NO_MEMORY(msg_dn);
/*
* by re-searching here we avoid having a lot of full
* records in memory between calls to getncchanges.
*
* We expect that we may get some objects that vanish
* (tombstone expunge) between the first and second
* check.
*/
ret = drsuapi_search_with_extended_dn(sam_ctx, tmp_ctx, &msg_res,
msg_dn,
LDB_SCOPE_BASE, msg_attrs, NULL);
if (ret != LDB_SUCCESS) {
if (ret != LDB_ERR_NO_SUCH_OBJECT) {
DEBUG(1,("getncchanges: failed to fetch DN %s - %s\n",
ldb_dn_get_extended_linearized(tmp_ctx, msg_dn, 1),
ldb_errstring(sam_ctx)));
}
TALLOC_FREE(tmp_ctx);
continue;
}
if (msg_res->count == 0) {
DEBUG(1,("getncchanges: got LDB_SUCCESS but failed"
"to get any results in fetch of DN "
"%s (race with tombstone expunge?)\n",
ldb_dn_get_extended_linearized(tmp_ctx,
msg_dn, 1)));
TALLOC_FREE(tmp_ctx);
continue;
}
msg = msg_res->msgs[0];
/*
* Check if we've already sent the object as an ancestor of
* another object. If so, we don't need to send it again
*/
if (getnc_state->obj_cache != NULL) {
werr = dcesrv_drsuapi_obj_cache_exists(getnc_state->obj_cache,
&getnc_state->guids[i]);
if (W_ERROR_EQUAL(werr, WERR_OBJECT_NAME_EXISTS)) {
obj_already_sent = true;
}
}
if (!obj_already_sent) {
bool max_wait_reached;
max_wait_reached = getncchanges_chunk_timed_out(repl_chunk);
/*
* Construct an object, ready to send (this will include
* the object's ancestors as well, if needed)
*/
werr = getncchanges_get_obj_to_send(msg, mem_ctx, sam_ctx,
getnc_state, schema,
&session_key, req10,
max_wait_reached,
local_pas, machine_dn,
&getnc_state->guids[i],
&new_objs);
if (!W_ERROR_IS_OK(werr)) {
return werr;
}
}
old_la_index = getnc_state->la_count;
/*
* We've reached the USN where this object naturally occurs.
* Regardless of whether we've already sent the object (as an
* ancestor), we add its links and update the HWM at this point
*/
werr = get_nc_changes_add_links(sam_ctx, getnc_state,
getnc_state->is_schema_nc,
schema, getnc_state->min_usn,
req10->replica_flags,
msg,
&getnc_state->la_list,
&getnc_state->la_count,
req10->uptodateness_vector);
if (!W_ERROR_IS_OK(werr)) {
return werr;
}
dcesrv_drsuapi_update_highwatermark(msg,
getnc_state->max_usn,
&r->out.ctr->ctr6.new_highwatermark);
if (new_objs != NULL) {
/*
* Add the object (and, if GET_ANC, any parents it may
* have) into the current chunk of replication data
*/
getncchanges_chunk_add_objects(repl_chunk, new_objs);
talloc_free(getnc_state->last_dn);
/*
* talloc_steal() as we still need msg->dn to
* be a valid pointer for the log on the next
* line.
*
* msg only remains in scope for the next 25
* lines or so anyway.
*/
getnc_state->last_dn = talloc_steal(getnc_state, msg->dn);
}
DEBUG(8,(__location__ ": %s object %s new tmp_highest_usn=%" PRIu64 "\n",
new_objs ? "replicating" : "skipping send of",
ldb_dn_get_linearized(msg->dn),
r->out.ctr->ctr6.new_highwatermark.tmp_highest_usn));
getnc_state->total_links += (getnc_state->la_count - old_la_index);
/*
* If the GET_TGT flag was set, check any new links added to
* make sure the client knows about the link target object
*/
if (getnc_state->is_get_tgt) {
werr = getncchanges_chunk_add_la_targets(repl_chunk,
getnc_state,
old_la_index,
mem_ctx, sam_ctx,
schema, &session_key,
req10, local_pas,
machine_dn);
if (!W_ERROR_IS_OK(werr)) {
return werr;
}
}
TALLOC_FREE(tmp_ctx);
}
/* copy the constructed object list into the response message */
r->out.ctr->ctr6.object_count = repl_chunk->object_count;
r->out.ctr->ctr6.first_object = repl_chunk->object_list;
getnc_state->num_processed = i;
if (i < getnc_state->num_records) {
r->out.ctr->ctr6.more_data = true;
}
/* the client can us to call UpdateRefs on its behalf to
re-establish monitoring of the NC */
if ((req10->replica_flags & (DRSUAPI_DRS_ADD_REF | DRSUAPI_DRS_REF_GCSPN)) &&
!GUID_all_zero(&req10->destination_dsa_guid)) {
struct drsuapi_DsReplicaUpdateRefsRequest1 ureq;
DEBUG(3,("UpdateRefs on getncchanges for %s\n",
GUID_string(mem_ctx, &req10->destination_dsa_guid)));
/*
* We pass the pre-validation NC root here as
* drsuapi_UpdateRefs() has to check its own input
* values due to being called from
* dcesrv_drsuapi_DsReplicaUpdateRefs()
*/
ureq.naming_context = untrusted_ncRoot;
ureq.dest_dsa_dns_name = samdb_ntds_msdcs_dns_name(sam_ctx, mem_ctx,
&req10->destination_dsa_guid);
if (!ureq.dest_dsa_dns_name) {
return WERR_NOT_ENOUGH_MEMORY;
}
ureq.dest_dsa_guid = req10->destination_dsa_guid;
ureq.options = DRSUAPI_DRS_ADD_REF |
DRSUAPI_DRS_ASYNC_OP |
DRSUAPI_DRS_GETCHG_CHECK;
/* we also need to pass through the
DRSUAPI_DRS_REF_GCSPN bit so that repsTo gets flagged
to send notifies using the GC SPN */
ureq.options |= (req10->replica_flags & DRSUAPI_DRS_REF_GCSPN);
werr = drsuapi_UpdateRefs(imsg_ctx,
dce_call->event_ctx,
b_state,
mem_ctx,
&ureq);
if (!W_ERROR_IS_OK(werr)) {
DEBUG(0,(__location__ ": Failed UpdateRefs on %s for %s in DsGetNCChanges - %s\n",
drs_ObjectIdentifier_to_debug_string(mem_ctx, untrusted_ncRoot),
ureq.dest_dsa_dns_name,
win_errstr(werr)));
}
}
/*
* Work out how many links we can send in this chunk. The default is to
* send all the links last, but there is a config option to send them
* immediately, in the same chunk as their source object
*/
if (!r->out.ctr->ctr6.more_data || repl_chunk->immediate_link_sync) {
link_count = getncchanges_chunk_links_pending(repl_chunk,
getnc_state);
link_count = MIN(link_count,
getncchanges_chunk_max_links(repl_chunk));
}
/* If we've got linked attributes to send, add them now */
if (link_count > 0) {
struct la_for_sorting *la_sorted;
/*
* Grab a chunk of linked attributes off the list and put them
* in sorted array, ready to send
*/
werr = getncchanges_get_sorted_array(&getnc_state->la_list[getnc_state->la_idx],
link_count,
sam_ctx, getnc_state,
schema,
&la_sorted);
if (!W_ERROR_IS_OK(werr)) {
return werr;
}
r->out.ctr->ctr6.linked_attributes_count = link_count;
r->out.ctr->ctr6.linked_attributes = talloc_array(r->out.ctr, struct drsuapi_DsReplicaLinkedAttribute, link_count);
if (r->out.ctr->ctr6.linked_attributes == NULL) {
DEBUG(0, ("Out of memory allocating %u linked attributes for output\n", link_count));
return WERR_NOT_ENOUGH_MEMORY;
}
for (k = 0; k < link_count; k++) {
r->out.ctr->ctr6.linked_attributes[k] = *la_sorted[k].link;
}
getnc_state->la_idx += link_count;
getnc_state->links_given += link_count;
if (getnc_state->la_idx < getnc_state->la_count) {
r->out.ctr->ctr6.more_data = true;
} else {
/*
* We've now sent all the links seen so far, so we can
* reset la_list back to an empty list again. Note that
* the steal means the linked attribute memory gets
* freed after this RPC message is sent on the wire.
*/
talloc_steal(mem_ctx, getnc_state->la_list);
getnc_state->la_list = NULL;
getnc_state->la_idx = 0;
getnc_state->la_count = 0;
}
TALLOC_FREE(la_sorted);
}
if (req10->replica_flags & DRSUAPI_DRS_GET_NC_SIZE) {
/*
* TODO: This implementation is wrong
* we should find out the total number of
* objects and links in the whole naming context
* at the start of the cycle and return these
* values in each message.
*
* For now we keep our current strategy and return
* the number of objects for this cycle and the number
* of links we found so far during the cycle.
*/
r->out.ctr->ctr6.nc_object_count = getnc_state->num_records;
r->out.ctr->ctr6.nc_linked_attributes_count = getnc_state->total_links;
}
if (req10->extended_op != DRSUAPI_EXOP_NONE) {
r->out.ctr->ctr6.uptodateness_vector = NULL;
r->out.ctr->ctr6.nc_object_count = 0;
ZERO_STRUCT(r->out.ctr->ctr6.new_highwatermark);
} else if (!r->out.ctr->ctr6.more_data) {
/* this is the last response in the replication cycle */
r->out.ctr->ctr6.new_highwatermark = getnc_state->final_hwm;
r->out.ctr->ctr6.uptodateness_vector = talloc_move(mem_ctx,
&getnc_state->final_udv);
/*
* Free the state info stored for the replication cycle. Note
* that the RPC message we're sending contains links stored in
* getnc_state. mem_ctx is local to this RPC call, so the memory
* will get freed after the RPC message is sent on the wire.
*
* We must not do this for an EXOP, as that should not
* end the replication state, which is why that is
* checked first above.
*/
talloc_steal(mem_ctx, getnc_state);
b_state->getncchanges_full_repl_state = NULL;
} else {
ret = drsuapi_DsReplicaHighWaterMark_cmp(&r->out.ctr->ctr6.old_highwatermark,
&r->out.ctr->ctr6.new_highwatermark);
if (ret == 0) {
/*
* We need to make sure that we never return the
* same highwatermark within the same replication
* cycle more than once. Otherwise we cannot detect
* when the client uses an unexpected highwatermark.
*
* This is a HACK which is needed because our
* object ordering is wrong and set tmp_highest_usn
* to a value that is higher than what we already
* sent to the client (destination dsa).
*/
r->out.ctr->ctr6.new_highwatermark.reserved_usn += 1;
}
getnc_state->last_hwm = r->out.ctr->ctr6.new_highwatermark;
}
TALLOC_FREE(repl_chunk);
DEBUG(r->out.ctr->ctr6.more_data?4:2,
("DsGetNCChanges with uSNChanged >= %llu flags 0x%08x on %s gave %u objects (done %u/%u) %u links (done %u/%u (as %s))\n",
(unsigned long long)(req10->highwatermark.highest_usn+1),
req10->replica_flags,
drs_ObjectIdentifier_to_debug_string(mem_ctx, untrusted_ncRoot),
r->out.ctr->ctr6.object_count,
i, r->out.ctr->ctr6.more_data?getnc_state->num_records:i,
r->out.ctr->ctr6.linked_attributes_count,
getnc_state->links_given, getnc_state->total_links,
dom_sid_string(mem_ctx, user_sid)));
#if 0
if (!r->out.ctr->ctr6.more_data && req10->extended_op != DRSUAPI_EXOP_NONE) {
NDR_PRINT_FUNCTION_DEBUG(drsuapi_DsGetNCChanges, NDR_BOTH, r);
}
#endif
return WERR_OK;
}