NTSTATUS rpccli_connect_netlogon(
struct cli_state *cli,
enum dcerpc_transport_t transport,
struct netlogon_creds_cli_context *creds_ctx,
bool force_reauth,
struct cli_credentials *trust_creds,
struct rpc_pipe_client **_rpccli)
{
TALLOC_CTX *frame = talloc_stackframe();
struct netlogon_creds_CredentialState *creds = NULL;
enum netlogon_creds_cli_lck_type lck_type;
enum netr_SchannelType sec_chan_type;
struct netlogon_creds_cli_lck *lck = NULL;
uint32_t negotiate_flags;
uint8_t found_session_key[16] = {0};
bool found_existing_creds = false;
bool do_serverauth;
struct rpc_pipe_client *rpccli;
NTSTATUS status;
bool retry = false;
sec_chan_type = cli_credentials_get_secure_channel_type(trust_creds);
if (sec_chan_type == SEC_CHAN_NULL) {
DBG_ERR("secure_channel_type gave SEC_CHAN_NULL\n");
status = NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
goto fail;
}
again:
/*
* See whether we can use existing netlogon_creds or
* whether we have to serverauthenticate.
*/
status = netlogon_creds_cli_get(creds_ctx, frame, &creds);
if (NT_STATUS_IS_OK(status)) {
int cmp = memcmp(found_session_key,
creds->session_key,
sizeof(found_session_key));
found_existing_creds = (cmp != 0);
memcpy(found_session_key,
creds->session_key,
sizeof(found_session_key));
TALLOC_FREE(creds);
}
lck_type = (force_reauth || !found_existing_creds) ?
NETLOGON_CREDS_CLI_LCK_EXCLUSIVE :
NETLOGON_CREDS_CLI_LCK_SHARED;
status = netlogon_creds_cli_lck(creds_ctx, lck_type, frame, &lck);
if (!NT_STATUS_IS_OK(status)) {
DBG_DEBUG("netlogon_creds_cli_lck failed: %s\n",
nt_errstr(status));
goto fail;
}
if (!found_existing_creds) {
/*
* Try to find creds under the lock again. Someone
* else might have done it for us.
*/
status = netlogon_creds_cli_get(creds_ctx, frame, &creds);
if (NT_STATUS_IS_OK(status)) {
int cmp = memcmp(found_session_key,
creds->session_key,
sizeof(found_session_key));
found_existing_creds = (cmp != 0);
memcpy(found_session_key, creds->session_key,
sizeof(found_session_key));
TALLOC_FREE(creds);
}
}
do_serverauth = force_reauth || !found_existing_creds;
if (!do_serverauth) {
/*
* Do the quick schannel bind without a reauth
*/
status = cli_rpc_pipe_open_bind_schannel(
cli, &ndr_table_netlogon, transport, creds_ctx,
&rpccli);
if (!retry && NT_STATUS_EQUAL(status, NT_STATUS_NETWORK_ACCESS_DENIED)) {
DBG_DEBUG("Retrying with serverauthenticate\n");
TALLOC_FREE(lck);
retry = true;
goto again;
}
if (!NT_STATUS_IS_OK(status)) {
DBG_DEBUG("cli_rpc_pipe_open_bind_schannel "
"failed: %s\n", nt_errstr(status));
goto fail;
}
goto done;
}
if (cli_credentials_is_anonymous(trust_creds)) {
DBG_WARNING("get_trust_credential for %s only gave anonymous,"
"unable to negotiate NETLOGON credentials\n",
netlogon_creds_cli_debug_string(
creds_ctx, frame));
status = NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
goto fail;
}
status = rpccli_setup_netlogon_creds_locked(
cli, transport, creds_ctx, true, trust_creds,
&negotiate_flags);
if (!NT_STATUS_IS_OK(status)) {
DBG_DEBUG("rpccli_setup_netlogon_creds failed for %s, "
"unable to setup NETLOGON credentials: %s\n",
netlogon_creds_cli_debug_string(
creds_ctx, frame),
nt_errstr(status));
goto fail;
}
if (!(negotiate_flags & NETLOGON_NEG_AUTHENTICATED_RPC)) {
if (lp_winbind_sealed_pipes() || lp_require_strong_key()) {
status = NT_STATUS_DOWNGRADE_DETECTED;
DBG_WARNING("Unwilling to make connection to %s"
"without connection level security, "
"must set 'winbind sealed pipes = false'"
" and 'require strong key = false' "
"to proceed: %s\n",
netlogon_creds_cli_debug_string(
creds_ctx, frame),
nt_errstr(status));
goto fail;
}
status = cli_rpc_pipe_open_noauth_transport(
cli, transport, &ndr_table_netlogon, &rpccli);
if (!NT_STATUS_IS_OK(status)) {
DBG_DEBUG("cli_rpc_pipe_open_noauth_transport "
"failed: %s\n", nt_errstr(status));
goto fail;
}
goto done;
}
status = cli_rpc_pipe_open_bind_schannel(
cli, &ndr_table_netlogon, transport, creds_ctx, &rpccli);
if (!NT_STATUS_IS_OK(status)) {
DBG_DEBUG("cli_rpc_pipe_open_bind_schannel "
"failed: %s\n", nt_errstr(status));
goto fail;
}
status = netlogon_creds_cli_check(creds_ctx, rpccli->binding_handle,
NULL);
if (!NT_STATUS_IS_OK(status)) {
DBG_WARNING("netlogon_creds_cli_check failed: %s\n",
nt_errstr(status));
goto fail;
}
done:
*_rpccli = rpccli;
status = NT_STATUS_OK;
fail:
ZERO_STRUCT(found_session_key);
TALLOC_FREE(lck);
TALLOC_FREE(frame);
return status;
}
NTSTATUS rpccli_setup_netlogon_creds(struct cli_state *cli,
enum dcerpc_transport_t transport,
struct netlogon_creds_cli_context *netlogon_creds,
bool force_reauth,
struct samr_Password current_nt_hash,
const struct samr_Password *previous_nt_hash)
{
TALLOC_CTX *frame = talloc_stackframe();
struct rpc_pipe_client *netlogon_pipe = NULL;
struct netlogon_creds_CredentialState *creds = NULL;
NTSTATUS status;
status = netlogon_creds_cli_get(netlogon_creds,
frame, &creds);
if (NT_STATUS_IS_OK(status)) {
const char *action = "using";
if (force_reauth) {
action = "overwrite";
}
DEBUG(5,("%s: %s cached netlogon_creds cli[%s/%s] to %s\n",
__FUNCTION__, action,
creds->account_name, creds->computer_name,
smbXcli_conn_remote_name(cli->conn)));
if (!force_reauth) {
TALLOC_FREE(frame);
return NT_STATUS_OK;
}
TALLOC_FREE(creds);
}
status = cli_rpc_pipe_open_noauth_transport(cli,
transport,
&ndr_table_netlogon,
&netlogon_pipe);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(5,("%s: failed to open noauth netlogon connection to %s - %s\n",
__FUNCTION__,
smbXcli_conn_remote_name(cli->conn),
nt_errstr(status)));
TALLOC_FREE(frame);
return status;
}
talloc_steal(frame, netlogon_pipe);
status = netlogon_creds_cli_auth(netlogon_creds,
netlogon_pipe->binding_handle,
current_nt_hash,
previous_nt_hash);
if (!NT_STATUS_IS_OK(status)) {
TALLOC_FREE(frame);
return status;
}
status = netlogon_creds_cli_get(netlogon_creds,
frame, &creds);
if (!NT_STATUS_IS_OK(status)) {
TALLOC_FREE(frame);
return NT_STATUS_INTERNAL_ERROR;
}
DEBUG(5,("%s: using new netlogon_creds cli[%s/%s] to %s\n",
__FUNCTION__,
creds->account_name, creds->computer_name,
smbXcli_conn_remote_name(cli->conn)));
TALLOC_FREE(frame);
return NT_STATUS_OK;
}
NTSTATUS rpccli_setup_netlogon_creds_locked(
struct cli_state *cli,
enum dcerpc_transport_t transport,
struct netlogon_creds_cli_context *creds_ctx,
bool force_reauth,
struct cli_credentials *cli_creds,
uint32_t *negotiate_flags)
{
TALLOC_CTX *frame = talloc_stackframe();
struct rpc_pipe_client *netlogon_pipe = NULL;
struct netlogon_creds_CredentialState *creds = NULL;
uint8_t num_nt_hashes = 0;
const struct samr_Password *nt_hashes[2] = { NULL, NULL };
uint8_t idx_nt_hashes = 0;
NTSTATUS status;
status = netlogon_creds_cli_get(creds_ctx, frame, &creds);
if (NT_STATUS_IS_OK(status)) {
const char *action = "using";
if (force_reauth) {
action = "overwrite";
}
DEBUG(5,("%s: %s cached netlogon_creds cli[%s/%s] to %s\n",
__FUNCTION__, action,
creds->account_name, creds->computer_name,
smbXcli_conn_remote_name(cli->conn)));
if (!force_reauth) {
goto done;
}
TALLOC_FREE(creds);
}
nt_hashes[0] = cli_credentials_get_nt_hash(cli_creds, talloc_tos());
if (nt_hashes[0] == NULL) {
TALLOC_FREE(frame);
return NT_STATUS_NO_MEMORY;
}
num_nt_hashes = 1;
nt_hashes[1] = cli_credentials_get_old_nt_hash(cli_creds,
talloc_tos());
if (nt_hashes[1] != NULL) {
num_nt_hashes = 2;
}
status = cli_rpc_pipe_open_noauth_transport(cli,
transport,
&ndr_table_netlogon,
&netlogon_pipe);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(5,("%s: failed to open noauth netlogon connection to %s - %s\n",
__FUNCTION__,
smbXcli_conn_remote_name(cli->conn),
nt_errstr(status)));
TALLOC_FREE(frame);
return status;
}
talloc_steal(frame, netlogon_pipe);
status = netlogon_creds_cli_auth(creds_ctx,
netlogon_pipe->binding_handle,
num_nt_hashes,
nt_hashes,
&idx_nt_hashes);
if (!NT_STATUS_IS_OK(status)) {
TALLOC_FREE(frame);
return status;
}
status = netlogon_creds_cli_get(creds_ctx, frame, &creds);
if (!NT_STATUS_IS_OK(status)) {
TALLOC_FREE(frame);
return NT_STATUS_INTERNAL_ERROR;
}
DEBUG(5,("%s: using new netlogon_creds cli[%s/%s] to %s\n",
__FUNCTION__,
creds->account_name, creds->computer_name,
smbXcli_conn_remote_name(cli->conn)));
done:
if (negotiate_flags != NULL) {
*negotiate_flags = creds->negotiate_flags;
}
TALLOC_FREE(frame);
return NT_STATUS_OK;
}
static NTSTATUS connect_to_domain_password_server(struct cli_state **cli_ret,
const char *domain,
const char *dc_name,
const struct sockaddr_storage *dc_ss,
struct rpc_pipe_client **pipe_ret,
TALLOC_CTX *mem_ctx,
struct netlogon_creds_cli_context **creds_ret)
{
TALLOC_CTX *frame = talloc_stackframe();
struct messaging_context *msg_ctx = server_messaging_context();
NTSTATUS result;
struct cli_state *cli = NULL;
struct rpc_pipe_client *netlogon_pipe = NULL;
struct netlogon_creds_cli_context *netlogon_creds = NULL;
struct netlogon_creds_CredentialState *creds = NULL;
uint32_t netlogon_flags = 0;
enum netr_SchannelType sec_chan_type = 0;
const char *_account_name = NULL;
const char *account_name = NULL;
struct samr_Password current_nt_hash;
struct samr_Password *previous_nt_hash = NULL;
bool ok;
*cli_ret = NULL;
*pipe_ret = NULL;
*creds_ret = NULL;
/* TODO: Send a SAMLOGON request to determine whether this is a valid
logonserver. We can avoid a 30-second timeout if the DC is down
if the SAMLOGON request fails as it is only over UDP. */
/* we use a mutex to prevent two connections at once - when a
Win2k PDC get two connections where one hasn't completed a
session setup yet it will send a TCP reset to the first
connection (tridge) */
/*
* With NT4.x DC's *all* authentication must be serialized to avoid
* ACCESS_DENIED errors if 2 auths are done from the same machine. JRA.
*/
mutex = grab_named_mutex(NULL, dc_name, 10);
if (mutex == NULL) {
TALLOC_FREE(frame);
return NT_STATUS_NO_LOGON_SERVERS;
}
/* Attempt connection */
result = cli_full_connection(&cli, lp_netbios_name(), dc_name, dc_ss, 0,
"IPC$", "IPC", "", "", "", 0, SMB_SIGNING_DEFAULT);
if (!NT_STATUS_IS_OK(result)) {
/* map to something more useful */
if (NT_STATUS_EQUAL(result, NT_STATUS_UNSUCCESSFUL)) {
result = NT_STATUS_NO_LOGON_SERVERS;
}
TALLOC_FREE(mutex);
TALLOC_FREE(frame);
return result;
}
/*
* We now have an anonymous connection to IPC$ on the domain password server.
*/
ok = get_trust_pw_hash(domain,
current_nt_hash.hash,
&_account_name,
&sec_chan_type);
if (!ok) {
cli_shutdown(cli);
TALLOC_FREE(mutex);
TALLOC_FREE(frame);
return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
}
account_name = talloc_asprintf(talloc_tos(), "%s$", _account_name);
if (account_name == NULL) {
cli_shutdown(cli);
TALLOC_FREE(mutex);
TALLOC_FREE(frame);
return NT_STATUS_NO_MEMORY;
}
result = rpccli_create_netlogon_creds(dc_name,
domain,
account_name,
sec_chan_type,
msg_ctx,
talloc_tos(),
&netlogon_creds);
if (!NT_STATUS_IS_OK(result)) {
cli_shutdown(cli);
TALLOC_FREE(mutex);
TALLOC_FREE(frame);
SAFE_FREE(previous_nt_hash);
return result;
}
result = rpccli_setup_netlogon_creds(cli,
netlogon_creds,
false, /* force_reauth */
current_nt_hash,
previous_nt_hash);
SAFE_FREE(previous_nt_hash);
if (!NT_STATUS_IS_OK(result)) {
cli_shutdown(cli);
TALLOC_FREE(mutex);
TALLOC_FREE(frame);
return result;
}
result = netlogon_creds_cli_get(netlogon_creds,
talloc_tos(),
&creds);
if (!NT_STATUS_IS_OK(result)) {
cli_shutdown(cli);
TALLOC_FREE(mutex);
TALLOC_FREE(frame);
return result;
}
netlogon_flags = creds->negotiate_flags;
TALLOC_FREE(creds);
if (netlogon_flags & NETLOGON_NEG_AUTHENTICATED_RPC) {
result = cli_rpc_pipe_open_schannel_with_key(
cli, &ndr_table_netlogon, NCACN_NP,
domain, netlogon_creds, &netlogon_pipe);
} else {
result = cli_rpc_pipe_open_noauth(cli,
&ndr_table_netlogon,
&netlogon_pipe);
}
if (!NT_STATUS_IS_OK(result)) {
DEBUG(0,("connect_to_domain_password_server: "
"unable to open the domain client session to "
"machine %s. Flags[0x%08X] Error was : %s.\n",
dc_name, (unsigned)netlogon_flags,
nt_errstr(result)));
cli_shutdown(cli);
TALLOC_FREE(mutex);
TALLOC_FREE(frame);
return result;
}
if(!netlogon_pipe) {
DEBUG(0, ("connect_to_domain_password_server: unable to open "
"the domain client session to machine %s. Error "
"was : %s.\n", dc_name, nt_errstr(result)));
cli_shutdown(cli);
TALLOC_FREE(mutex);
TALLOC_FREE(frame);
return NT_STATUS_NO_LOGON_SERVERS;
}
/* We exit here with the mutex *locked*. JRA */
*cli_ret = cli;
*pipe_ret = netlogon_pipe;
*creds_ret = talloc_move(mem_ctx, &netlogon_creds);
TALLOC_FREE(frame);
return NT_STATUS_OK;
}
