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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 2 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, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "includes.h"
#include "libnet/libnet.h"
/**
* Decrypt and extract the user's passwords.
*
* The writes decrypted (no longer 'RID encrypted' or arcfour encrypted) passwords back into the structure
*/
static NTSTATUS fix_user(TALLOC_CTX *mem_ctx,
struct creds_CredentialState *creds,
enum netr_SamDatabaseID database,
struct netr_DELTA_ENUM *delta,
char **error_string)
{
uint32_t rid = delta->delta_id_union.rid;
struct netr_DELTA_USER *user = delta->delta_union.user;
struct samr_Password lm_hash;
struct samr_Password nt_hash;
const char *username = user->account_name.string;
NTSTATUS nt_status;
if (user->lm_password_present) {
sam_rid_crypt(rid, user->lmpassword.hash, lm_hash.hash, 0);
user->lmpassword = lm_hash;
}
if (user->nt_password_present) {
sam_rid_crypt(rid, user->ntpassword.hash, nt_hash.hash, 0);
user->ntpassword = nt_hash;
}
if (user->user_private_info.SensitiveData) {
DATA_BLOB data;
struct netr_USER_KEYS keys;
data.data = user->user_private_info.SensitiveData;
data.length = user->user_private_info.DataLength;
creds_arcfour_crypt(creds, data.data, data.length);
user->user_private_info.SensitiveData = data.data;
user->user_private_info.DataLength = data.length;
nt_status = ndr_pull_struct_blob(&data, mem_ctx, &keys, (ndr_pull_flags_fn_t)ndr_pull_netr_USER_KEYS);
if (NT_STATUS_IS_OK(nt_status)) {
if (keys.keys.keys2.lmpassword.length == 16) {
sam_rid_crypt(rid, keys.keys.keys2.lmpassword.pwd.hash, lm_hash.hash, 0);
user->lmpassword = lm_hash;
user->lm_password_present = True;
}
if (keys.keys.keys2.ntpassword.length == 16) {
sam_rid_crypt(rid, keys.keys.keys2.ntpassword.pwd.hash, nt_hash.hash, 0);
user->ntpassword = nt_hash;
user->nt_password_present = True;
}
} else {
*error_string = talloc_asprintf(mem_ctx, "Failed to parse Sensitive Data for %s:\n", username);
dump_data(10, data.data, data.length);
return nt_status;
}
}
return NT_STATUS_OK;
}
/**
* Decrypt and extract the secrets
*
* The writes decrypted secrets back into the structure
*/
static NTSTATUS fix_secret(TALLOC_CTX *mem_ctx,
struct creds_CredentialState *creds,
enum netr_SamDatabaseID database,
struct netr_DELTA_ENUM *delta,
char **error_string)
{
struct netr_DELTA_SECRET *secret = delta->delta_union.secret;
creds_arcfour_crypt(creds, secret->current_cipher.cipher_data,
secret->current_cipher.maxlen);
creds_arcfour_crypt(creds, secret->old_cipher.cipher_data,
secret->old_cipher.maxlen);
return NT_STATUS_OK;
}
/**
* Fix up the delta, dealing with encryption issues so that the final
* callback need only do the printing or application logic
*/
static NTSTATUS fix_delta(TALLOC_CTX *mem_ctx,
struct creds_CredentialState *creds,
enum netr_SamDatabaseID database,
struct netr_DELTA_ENUM *delta,
char **error_string)
{
NTSTATUS nt_status = NT_STATUS_OK;
*error_string = NULL;
switch (delta->delta_type) {
case NETR_DELTA_USER:
{
nt_status = fix_user(mem_ctx,
creds,
database,
delta,
error_string);
break;
}
case NETR_DELTA_SECRET:
{
nt_status = fix_secret(mem_ctx,
creds,
database,
delta,
error_string);
break;
}
default:
break;
}
return nt_status;
}
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 creds_CredentialState *creds;
struct netr_DatabaseSync dbsync;
struct cli_credentials *machine_account;
struct dcerpc_binding *b;
struct dcerpc_pipe *p;
const enum netr_SamDatabaseID database_ids[] = {SAM_DATABASE_DOMAIN, SAM_DATABASE_BUILTIN, SAM_DATABASE_PRIVS};
int i;
/* TODO: This is bogus */
const char **bindings = lp_passwordserver();
const char *binding;
if (bindings && bindings[0]) {
binding = bindings[0];
} else {
return NT_STATUS_INVALID_PARAMETER;
}
samsync_ctx = talloc_named(mem_ctx, 0, "SamSync top context");
if (!r->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);
nt_status = cli_credentials_set_machine_account(machine_account);
if (!NT_STATUS_IS_OK(nt_status)) {
r->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->machine_account;
}
if (cli_credentials_get_secure_channel_type(machine_account) != SEC_CHAN_BDC) {
r->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;
}
/* Connect to DC (take a binding string for now) */
nt_status = dcerpc_parse_binding(samsync_ctx, binding, &b);
if (!NT_STATUS_IS_OK(nt_status)) {
r->error_string = talloc_asprintf(mem_ctx, "Bad binding string %s\n", binding);
talloc_free(samsync_ctx);
return NT_STATUS_INVALID_PARAMETER;
}
/* We like schannel */
b->flags &= ~DCERPC_AUTH_OPTIONS;
b->flags |= DCERPC_SCHANNEL | DCERPC_SEAL /* | DCERPC_SCHANNEL_128 */;
/* Setup schannel */
nt_status = dcerpc_pipe_connect_b(samsync_ctx, &p, b,
&dcerpc_table_netlogon,
machine_account, ctx->event_ctx);
if (!NT_STATUS_IS_OK(nt_status)) {
talloc_free(samsync_ctx);
return nt_status;
}
/* get NETLOGON credentails */
nt_status = dcerpc_schannel_creds(p->conn->security_state.generic_state, samsync_ctx, &creds);
if (!NT_STATUS_IS_OK(nt_status)) {
r->error_string = talloc_strdup(mem_ctx, "Could not obtain NETLOGON credentials from DCERPC/GENSEC layer");
talloc_free(samsync_ctx);
return nt_status;
}
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;
ZERO_STRUCT(dbsync.in.return_authenticator);
for (i=0;i< ARRAY_SIZE(database_ids); i++) {
dbsync.in.sync_context = 0;
dbsync.in.database_id = database_ids[i];
do {
int d;
loop_ctx = talloc_named(samsync_ctx, 0, "DatabaseSync loop context");
creds_client_authenticator(creds, &dbsync.in.credential);
dbsync_nt_status = dcerpc_netr_DatabaseSync(p, loop_ctx, &dbsync);
if (!NT_STATUS_IS_OK(dbsync_nt_status) &&
!NT_STATUS_EQUAL(dbsync_nt_status, STATUS_MORE_ENTRIES)) {
r->error_string = talloc_asprintf(samsync_ctx, "DatabaseSync failed - %s", nt_errstr(nt_status));
talloc_free(samsync_ctx);
return nt_status;
}
if (!creds_client_check(creds, &dbsync.out.return_authenticator.cred)) {
r->error_string = talloc_strdup(samsync_ctx, "Credential chaining failed");
talloc_free(samsync_ctx);
return NT_STATUS_ACCESS_DENIED;
}
dbsync.in.sync_context = dbsync.out.sync_context;
for (d=0; d < dbsync.out.delta_enum_array->num_deltas; d++) {
char *error_string = NULL;
delta_ctx = talloc_named(loop_ctx, 0, "DatabaseSync delta context");
nt_status = fix_delta(delta_ctx,
creds,
dbsync.in.database_id,
&dbsync.out.delta_enum_array->delta_enum[d],
&error_string);
if (!NT_STATUS_IS_OK(nt_status)) {
r->error_string = talloc_steal(samsync_ctx, error_string);
talloc_free(samsync_ctx);
return nt_status;
}
nt_status = r->delta_fn(delta_ctx,
r->fn_ctx,
creds,
dbsync.in.database_id,
&dbsync.out.delta_enum_array->delta_enum[d],
&error_string);
if (!NT_STATUS_IS_OK(nt_status)) {
r->error_string = talloc_steal(samsync_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));
nt_status = dbsync_nt_status;
}
talloc_free(samsync_ctx);
return nt_status;
}
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