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/*
Unix SMB/CIFS implementation.
Extract the user/system database from a remote SamSync server
Copyright (C) Andrew Bartlett <abartlet@samba.org> 2004-2005
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 "libnet/libnet.h"
#include "libcli/auth/libcli_auth.h"
#include "../libcli/samsync/samsync.h"
#include "auth/gensec/gensec.h"
#include "auth/credentials/credentials.h"
#include "libcli/auth/schannel.h"
#include "librpc/gen_ndr/ndr_netlogon.h"
#include "librpc/gen_ndr/ndr_netlogon_c.h"
#include "param/param.h"
NTSTATUS libnet_SamSync_netlogon(struct libnet_context *ctx, TALLOC_CTX *mem_ctx, struct libnet_SamSync *r)
{
NTSTATUS nt_status, dbsync_nt_status;
TALLOC_CTX *samsync_ctx, *loop_ctx, *delta_ctx;
struct netlogon_creds_CredentialState *creds;
struct netr_DatabaseSync dbsync;
struct netr_Authenticator credential, return_authenticator;
struct netr_DELTA_ENUM_ARRAY *delta_enum_array = NULL;
struct cli_credentials *machine_account;
struct dcerpc_pipe *p;
struct libnet_context *machine_net_ctx;
struct libnet_RpcConnect *c;
struct libnet_SamSync_state *state;
const enum netr_SamDatabaseID database_ids[] = {SAM_DATABASE_DOMAIN, SAM_DATABASE_BUILTIN, SAM_DATABASE_PRIVS};
unsigned int i;
samsync_ctx = talloc_named(mem_ctx, 0, "SamSync top context");
if (!r->in.machine_account) {
machine_account = cli_credentials_init(samsync_ctx);
if (!machine_account) {
talloc_free(samsync_ctx);
return NT_STATUS_NO_MEMORY;
}
cli_credentials_set_conf(machine_account, ctx->lp_ctx);
nt_status = cli_credentials_set_machine_account(machine_account, ctx->lp_ctx);
if (!NT_STATUS_IS_OK(nt_status)) {
r->out.error_string = talloc_strdup(mem_ctx, "Could not obtain machine account password - are we joined to the domain?");
talloc_free(samsync_ctx);
return nt_status;
}
} else {
machine_account = r->in.machine_account;
}
/* We cannot do this unless we are a BDC. Check, before we get odd errors later */
if (cli_credentials_get_secure_channel_type(machine_account) != SEC_CHAN_BDC) {
r->out.error_string
= talloc_asprintf(mem_ctx,
"Our join to domain %s is not as a BDC (%d), please rejoin as a BDC",
cli_credentials_get_domain(machine_account),
cli_credentials_get_secure_channel_type(machine_account));
talloc_free(samsync_ctx);
return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
}
c = talloc_zero(samsync_ctx, struct libnet_RpcConnect);
if (!c) {
r->out.error_string = NULL;
talloc_free(samsync_ctx);
return NT_STATUS_NO_MEMORY;
}
c->level = LIBNET_RPC_CONNECT_DC_INFO;
if (r->in.binding_string) {
c->in.binding = r->in.binding_string;
c->in.name = NULL;
} else {
c->in.binding = NULL;
c->in.name = cli_credentials_get_domain(machine_account);
}
/* prepare connect to the NETLOGON pipe of PDC */
c->in.dcerpc_iface = &ndr_table_netlogon;
/* We must do this as the machine, not as any command-line
* user. So we override the credentials in the
* libnet_context */
machine_net_ctx = talloc(samsync_ctx, struct libnet_context);
if (!machine_net_ctx) {
r->out.error_string = NULL;
talloc_free(samsync_ctx);
return NT_STATUS_NO_MEMORY;
}
*machine_net_ctx = *ctx;
machine_net_ctx->cred = machine_account;
/* connect to the NETLOGON pipe of the PDC */
nt_status = libnet_RpcConnect(machine_net_ctx, samsync_ctx, c);
if (!NT_STATUS_IS_OK(nt_status)) {
if (r->in.binding_string) {
r->out.error_string = talloc_asprintf(mem_ctx,
"Connection to NETLOGON pipe of DC %s failed: %s",
r->in.binding_string, c->out.error_string);
} else {
r->out.error_string = talloc_asprintf(mem_ctx,
"Connection to NETLOGON pipe of DC for %s failed: %s",
c->in.name, c->out.error_string);
}
talloc_free(samsync_ctx);
return nt_status;
}
/* This makes a new pipe, on which we can do schannel. We
* should do this in the RpcConnect code, but the abstaction
* layers do not suit yet */
nt_status = dcerpc_secondary_connection(c->out.dcerpc_pipe, &p,
c->out.dcerpc_pipe->binding);
if (!NT_STATUS_IS_OK(nt_status)) {
r->out.error_string = talloc_asprintf(mem_ctx,
"Secondary connection to NETLOGON pipe of DC %s failed: %s",
dcerpc_server_name(p), nt_errstr(nt_status));
talloc_free(samsync_ctx);
return nt_status;
}
nt_status = dcerpc_bind_auth_schannel(samsync_ctx, p, &ndr_table_netlogon,
machine_account, ctx->lp_ctx, DCERPC_AUTH_LEVEL_PRIVACY);
if (!NT_STATUS_IS_OK(nt_status)) {
r->out.error_string = talloc_asprintf(mem_ctx,
"SCHANNEL authentication to NETLOGON pipe of DC %s failed: %s",
dcerpc_server_name(p), nt_errstr(nt_status));
talloc_free(samsync_ctx);
return nt_status;
}
state = talloc(samsync_ctx, struct libnet_SamSync_state);
if (!state) {
r->out.error_string = NULL;
talloc_free(samsync_ctx);
return nt_status;
}
state->domain_name = c->out.domain_name;
state->domain_sid = c->out.domain_sid;
state->realm = c->out.realm;
state->domain_guid = c->out.guid;
state->machine_net_ctx = machine_net_ctx;
state->netlogon_pipe = p;
/* initialise the callback layer. It may wish to contact the
* server with ldap, now we know the name */
if (r->in.init_fn) {
char *error_string;
nt_status = r->in.init_fn(samsync_ctx,
r->in.fn_ctx,
state,
&error_string);
if (!NT_STATUS_IS_OK(nt_status)) {
r->out.error_string = talloc_steal(mem_ctx, error_string);
talloc_free(samsync_ctx);
return nt_status;
}
}
/* get NETLOGON credentials */
creds = cli_credentials_get_netlogon_creds(machine_account);
if (creds == NULL) {
r->out.error_string = talloc_strdup(mem_ctx, "Could not obtain NETLOGON credentials from credentials");
talloc_free(samsync_ctx);
return nt_status;
}
/* Setup details for the synchronisation */
ZERO_STRUCT(return_authenticator);
dbsync.in.logon_server = talloc_asprintf(samsync_ctx, "\\\\%s", dcerpc_server_name(p));
dbsync.in.computername = cli_credentials_get_workstation(machine_account);
dbsync.in.preferredmaximumlength = (uint32_t)-1;
dbsync.in.return_authenticator = &return_authenticator;
dbsync.out.return_authenticator = &return_authenticator;
dbsync.out.delta_enum_array = &delta_enum_array;
for (i=0;i< ARRAY_SIZE(database_ids); i++) {
uint32_t sync_context = 0;
dbsync.in.database_id = database_ids[i];
dbsync.in.sync_context = &sync_context;
dbsync.out.sync_context = &sync_context;
do {
uint32_t d;
loop_ctx = talloc_named(samsync_ctx, 0, "DatabaseSync loop context");
netlogon_creds_client_authenticator(creds, &credential);
dbsync.in.credential = &credential;
dbsync_nt_status = dcerpc_netr_DatabaseSync_r(p->binding_handle, loop_ctx, &dbsync);
if (NT_STATUS_IS_OK(dbsync_nt_status) && !NT_STATUS_IS_OK(dbsync.out.result)) {
dbsync_nt_status = dbsync.out.result;
}
if (!NT_STATUS_IS_OK(dbsync_nt_status) &&
!NT_STATUS_EQUAL(dbsync_nt_status, STATUS_MORE_ENTRIES)) {
r->out.error_string = talloc_asprintf(mem_ctx, "DatabaseSync failed - %s", nt_errstr(nt_status));
talloc_free(samsync_ctx);
return nt_status;
}
if (!netlogon_creds_client_check(creds, &dbsync.out.return_authenticator->cred)) {
r->out.error_string = talloc_strdup(mem_ctx, "Credential chaining on incoming DatabaseSync failed");
talloc_free(samsync_ctx);
return NT_STATUS_ACCESS_DENIED;
}
dbsync.in.sync_context = dbsync.out.sync_context;
/* For every single remote 'delta' entry: */
for (d=0; d < delta_enum_array->num_deltas; d++) {
char *error_string = NULL;
delta_ctx = talloc_named(loop_ctx, 0, "DatabaseSync delta context");
/* 'Fix' elements, by decrypting and
* de-obfuscating the data */
nt_status = samsync_fix_delta(delta_ctx,
creds,
dbsync.in.database_id,
&delta_enum_array->delta_enum[d]);
if (!NT_STATUS_IS_OK(nt_status)) {
r->out.error_string = talloc_steal(mem_ctx, error_string);
talloc_free(samsync_ctx);
return nt_status;
}
/* Now call the callback. This will
* do something like print the data or
* write to an ldb */
nt_status = r->in.delta_fn(delta_ctx,
r->in.fn_ctx,
dbsync.in.database_id,
&delta_enum_array->delta_enum[d],
&error_string);
if (!NT_STATUS_IS_OK(nt_status)) {
r->out.error_string = talloc_steal(mem_ctx, error_string);
talloc_free(samsync_ctx);
return nt_status;
}
talloc_free(delta_ctx);
}
talloc_free(loop_ctx);
} while (NT_STATUS_EQUAL(dbsync_nt_status, STATUS_MORE_ENTRIES));
if (!NT_STATUS_IS_OK(dbsync_nt_status)) {
r->out.error_string = talloc_asprintf(mem_ctx, "libnet_SamSync_netlogon failed: unexpected inconsistency. Should not get error %s here", nt_errstr(dbsync_nt_status));
talloc_free(samsync_ctx);
return dbsync_nt_status;
}
nt_status = NT_STATUS_OK;
}
talloc_free(samsync_ctx);
return nt_status;
}
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