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/*
Unix SMB/CIFS mplementation.
Helper functions for applying replicated objects
Copyright (C) Stefan Metzmacher <metze@samba.org> 2007
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "includes.h"
#include "dsdb/samdb/samdb.h"
#include "lib/ldb/include/ldb_errors.h"
#include "lib/util/dlinklist.h"
#include "librpc/gen_ndr/ndr_misc.h"
#include "librpc/gen_ndr/ndr_drsuapi.h"
#include "librpc/gen_ndr/ndr_drsblobs.h"
#include "../lib/crypto/crypto.h"
#include "libcli/auth/libcli_auth.h"
#include "param/param.h"
static WERROR dsdb_decrypt_attribute_value(TALLOC_CTX *mem_ctx,
const DATA_BLOB *gensec_skey,
bool rid_crypt,
uint32_t rid,
DATA_BLOB *in,
DATA_BLOB *out)
{
DATA_BLOB confounder;
DATA_BLOB enc_buffer;
struct MD5Context md5;
uint8_t _enc_key[16];
DATA_BLOB enc_key;
DATA_BLOB dec_buffer;
uint32_t crc32_given;
uint32_t crc32_calc;
DATA_BLOB checked_buffer;
DATA_BLOB plain_buffer;
/*
* users with rid == 0 should not exist
*/
if (rid_crypt && rid == 0) {
return WERR_DS_DRA_INVALID_PARAMETER;
}
/*
* the first 16 bytes at the beginning are the confounder
* followed by the 4 byte crc32 checksum
*/
if (in->length < 20) {
return WERR_DS_DRA_INVALID_PARAMETER;
}
confounder = data_blob_const(in->data, 16);
enc_buffer = data_blob_const(in->data + 16, in->length - 16);
/*
* build the encryption key md5 over the session key followed
* by the confounder
*
* here the gensec session key is used and
* not the dcerpc ncacn_ip_tcp "SystemLibraryDTC" key!
*/
enc_key = data_blob_const(_enc_key, sizeof(_enc_key));
MD5Init(&md5);
MD5Update(&md5, gensec_skey->data, gensec_skey->length);
MD5Update(&md5, confounder.data, confounder.length);
MD5Final(enc_key.data, &md5);
/*
* copy the encrypted buffer part and
* decrypt it using the created encryption key using arcfour
*/
dec_buffer = data_blob_const(enc_buffer.data, enc_buffer.length);
arcfour_crypt_blob(dec_buffer.data, dec_buffer.length, &enc_key);
/*
* the first 4 byte are the crc32 checksum
* of the remaining bytes
*/
crc32_given = IVAL(dec_buffer.data, 0);
crc32_calc = crc32_calc_buffer(dec_buffer.data + 4 , dec_buffer.length - 4);
if (crc32_given != crc32_calc) {
return WERR_SEC_E_DECRYPT_FAILURE;
}
checked_buffer = data_blob_const(dec_buffer.data + 4, dec_buffer.length - 4);
plain_buffer = data_blob_talloc(mem_ctx, checked_buffer.data, checked_buffer.length);
W_ERROR_HAVE_NO_MEMORY(plain_buffer.data);
/*
* The following rid_crypt obfuscation isn't session specific
* and not really needed here, because we allways know the rid of the
* user account.
*
* But for the rest of samba it's easier when we remove this static
* obfuscation here
*/
if (rid_crypt) {
uint32_t i, num_hashes;
if ((checked_buffer.length % 16) != 0) {
return WERR_DS_DRA_INVALID_PARAMETER;
}
num_hashes = plain_buffer.length / 16;
for (i = 0; i < num_hashes; i++) {
uint32_t offset = i * 16;
sam_rid_crypt(rid, checked_buffer.data + offset, plain_buffer.data + offset, 0);
}
}
*out = plain_buffer;
return WERR_OK;
}
static WERROR dsdb_decrypt_attribute(const DATA_BLOB *gensec_skey,
uint32_t rid,
struct drsuapi_DsReplicaAttribute *attr)
{
WERROR status;
TALLOC_CTX *mem_ctx;
DATA_BLOB *enc_data;
DATA_BLOB plain_data;
bool rid_crypt = false;
if (attr->value_ctr.num_values == 0) {
return WERR_OK;
}
switch (attr->attid) {
case DRSUAPI_ATTRIBUTE_dBCSPwd:
case DRSUAPI_ATTRIBUTE_unicodePwd:
case DRSUAPI_ATTRIBUTE_ntPwdHistory:
case DRSUAPI_ATTRIBUTE_lmPwdHistory:
rid_crypt = true;
break;
case DRSUAPI_ATTRIBUTE_supplementalCredentials:
case DRSUAPI_ATTRIBUTE_priorValue:
case DRSUAPI_ATTRIBUTE_currentValue:
case DRSUAPI_ATTRIBUTE_trustAuthOutgoing:
case DRSUAPI_ATTRIBUTE_trustAuthIncoming:
case DRSUAPI_ATTRIBUTE_initialAuthOutgoing:
case DRSUAPI_ATTRIBUTE_initialAuthIncoming:
break;
default:
return WERR_OK;
}
if (attr->value_ctr.num_values > 1) {
return WERR_DS_DRA_INVALID_PARAMETER;
}
if (!attr->value_ctr.values[0].blob) {
return WERR_DS_DRA_INVALID_PARAMETER;
}
mem_ctx = attr->value_ctr.values[0].blob;
enc_data = attr->value_ctr.values[0].blob;
status = dsdb_decrypt_attribute_value(mem_ctx,
gensec_skey,
rid_crypt,
rid,
enc_data,
&plain_data);
W_ERROR_NOT_OK_RETURN(status);
talloc_free(attr->value_ctr.values[0].blob->data);
*attr->value_ctr.values[0].blob = plain_data;
return WERR_OK;
}
static WERROR dsdb_convert_object(struct ldb_context *ldb,
const struct dsdb_schema *schema,
struct dsdb_extended_replicated_objects *ctr,
const struct drsuapi_DsReplicaObjectListItemEx *in,
const DATA_BLOB *gensec_skey,
TALLOC_CTX *mem_ctx,
struct dsdb_extended_replicated_object *out)
{
NTSTATUS nt_status;
enum ndr_err_code ndr_err;
WERROR status;
uint32_t i;
struct ldb_message *msg;
struct replPropertyMetaDataBlob *md;
struct ldb_val guid_value;
NTTIME whenChanged = 0;
time_t whenChanged_t;
const char *whenChanged_s;
const char *rdn_name = NULL;
const struct ldb_val *rdn_value = NULL;
const struct dsdb_attribute *rdn_attr = NULL;
uint32_t rdn_attid;
struct drsuapi_DsReplicaAttribute *name_a = NULL;
struct drsuapi_DsReplicaMetaData *name_d = NULL;
struct replPropertyMetaData1 *rdn_m = NULL;
struct dom_sid *sid = NULL;
uint32_t rid = 0;
int ret;
if (!in->object.identifier) {
return WERR_FOOBAR;
}
if (!in->object.identifier->dn || !in->object.identifier->dn[0]) {
return WERR_FOOBAR;
}
if (in->object.attribute_ctr.num_attributes != 0 && !in->meta_data_ctr) {
return WERR_FOOBAR;
}
if (in->object.attribute_ctr.num_attributes != in->meta_data_ctr->count) {
return WERR_FOOBAR;
}
sid = &in->object.identifier->sid;
if (sid->num_auths > 0) {
rid = sid->sub_auths[sid->num_auths - 1];
}
msg = ldb_msg_new(mem_ctx);
W_ERROR_HAVE_NO_MEMORY(msg);
msg->dn = ldb_dn_new(msg, ldb, in->object.identifier->dn);
W_ERROR_HAVE_NO_MEMORY(msg->dn);
rdn_name = ldb_dn_get_rdn_name(msg->dn);
rdn_attr = dsdb_attribute_by_lDAPDisplayName(schema, rdn_name);
if (!rdn_attr) {
return WERR_FOOBAR;
}
rdn_attid = rdn_attr->attributeID_id;
rdn_value = ldb_dn_get_rdn_val(msg->dn);
msg->num_elements = in->object.attribute_ctr.num_attributes;
msg->elements = talloc_array(msg, struct ldb_message_element,
msg->num_elements);
W_ERROR_HAVE_NO_MEMORY(msg->elements);
md = talloc(mem_ctx, struct replPropertyMetaDataBlob);
W_ERROR_HAVE_NO_MEMORY(md);
md->version = 1;
md->reserved = 0;
md->ctr.ctr1.count = in->meta_data_ctr->count;
md->ctr.ctr1.reserved = 0;
md->ctr.ctr1.array = talloc_array(mem_ctx,
struct replPropertyMetaData1,
md->ctr.ctr1.count + 1); /* +1 because of the RDN attribute */
W_ERROR_HAVE_NO_MEMORY(md->ctr.ctr1.array);
for (i=0; i < in->meta_data_ctr->count; i++) {
struct drsuapi_DsReplicaAttribute *a;
struct drsuapi_DsReplicaMetaData *d;
struct replPropertyMetaData1 *m;
struct ldb_message_element *e;
a = &in->object.attribute_ctr.attributes[i];
d = &in->meta_data_ctr->meta_data[i];
m = &md->ctr.ctr1.array[i];
e = &msg->elements[i];
status = dsdb_decrypt_attribute(gensec_skey, rid, a);
W_ERROR_NOT_OK_RETURN(status);
status = dsdb_attribute_drsuapi_to_ldb(schema, a, msg->elements, e);
W_ERROR_NOT_OK_RETURN(status);
m->attid = a->attid;
m->version = d->version;
m->originating_change_time = d->originating_change_time;
m->originating_invocation_id = d->originating_invocation_id;
m->originating_usn = d->originating_usn;
m->local_usn = 0;
if (d->originating_change_time > whenChanged) {
whenChanged = d->originating_change_time;
}
if (a->attid == DRSUAPI_ATTRIBUTE_name) {
name_a = a;
name_d = d;
rdn_m = &md->ctr.ctr1.array[md->ctr.ctr1.count];
}
}
if (rdn_m) {
ret = ldb_msg_add_value(msg, rdn_attr->lDAPDisplayName, rdn_value, NULL);
if (ret != LDB_SUCCESS) {
return WERR_FOOBAR;
}
rdn_m->attid = rdn_attid;
rdn_m->version = name_d->version;
rdn_m->originating_change_time = name_d->originating_change_time;
rdn_m->originating_invocation_id = name_d->originating_invocation_id;
rdn_m->originating_usn = name_d->originating_usn;
rdn_m->local_usn = 0;
md->ctr.ctr1.count++;
}
whenChanged_t = nt_time_to_unix(whenChanged);
whenChanged_s = ldb_timestring(msg, whenChanged_t);
W_ERROR_HAVE_NO_MEMORY(whenChanged_s);
ndr_err = ndr_push_struct_blob(&guid_value, msg,
lp_iconv_convenience(ldb_get_opaque(ldb, "loadparm")),
&in->object.identifier->guid,
(ndr_push_flags_fn_t)ndr_push_GUID);
if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
nt_status = ndr_map_error2ntstatus(ndr_err);
return ntstatus_to_werror(nt_status);
}
out->msg = msg;
out->guid_value = guid_value;
out->when_changed = whenChanged_s;
out->meta_data = md;
return WERR_OK;
}
WERROR dsdb_extended_replicated_objects_commit(struct ldb_context *ldb,
const char *partition_dn,
const struct drsuapi_DsReplicaOIDMapping_Ctr *mapping_ctr,
uint32_t object_count,
const struct drsuapi_DsReplicaObjectListItemEx *first_object,
uint32_t linked_attributes_count,
const struct drsuapi_DsReplicaLinkedAttribute *linked_attributes,
const struct repsFromTo1 *source_dsa,
const struct drsuapi_DsReplicaCursor2CtrEx *uptodateness_vector,
const DATA_BLOB *gensec_skey,
TALLOC_CTX *mem_ctx,
struct dsdb_extended_replicated_objects **_out)
{
WERROR status;
const struct dsdb_schema *schema;
struct dsdb_extended_replicated_objects *out;
struct ldb_result *ext_res;
const struct drsuapi_DsReplicaObjectListItemEx *cur;
uint32_t i;
int ret;
schema = dsdb_get_schema(ldb);
if (!schema) {
return WERR_DS_SCHEMA_NOT_LOADED;
}
status = dsdb_verify_oid_mappings_drsuapi(schema, mapping_ctr);
W_ERROR_NOT_OK_RETURN(status);
out = talloc_zero(mem_ctx, struct dsdb_extended_replicated_objects);
W_ERROR_HAVE_NO_MEMORY(out);
out->version = DSDB_EXTENDED_REPLICATED_OBJECTS_VERSION;
out->partition_dn = ldb_dn_new(out, ldb, partition_dn);
W_ERROR_HAVE_NO_MEMORY(out->partition_dn);
out->source_dsa = source_dsa;
out->uptodateness_vector= uptodateness_vector;
out->num_objects = object_count;
out->objects = talloc_array(out,
struct dsdb_extended_replicated_object,
out->num_objects);
W_ERROR_HAVE_NO_MEMORY(out->objects);
for (i=0, cur = first_object; cur; cur = cur->next_object, i++) {
if (i == out->num_objects) {
return WERR_FOOBAR;
}
status = dsdb_convert_object(ldb, schema, out, cur, gensec_skey, out->objects, &out->objects[i]);
W_ERROR_NOT_OK_RETURN(status);
}
if (i != out->num_objects) {
return WERR_FOOBAR;
}
/* TODO: handle linked attributes */
ret = ldb_extended(ldb, DSDB_EXTENDED_REPLICATED_OBJECTS_OID, out, &ext_res);
if (ret != LDB_SUCCESS) {
DEBUG(0,("Failed to apply records: %s: %s\n",
ldb_errstring(ldb), ldb_strerror(ret)));
talloc_free(out);
return WERR_FOOBAR;
}
talloc_free(ext_res);
if (_out) {
*_out = out;
} else {
talloc_free(out);
}
return WERR_OK;
}
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