NTSTATUS rpccli_create_netlogon_creds_ctx(
struct cli_credentials *creds,
const char *server_computer,
struct messaging_context *msg_ctx,
TALLOC_CTX *mem_ctx,
struct netlogon_creds_cli_context **creds_ctx)
{
enum netr_SchannelType sec_chan_type;
const char *server_netbios_domain;
const char *server_dns_domain;
const char *client_account;
sec_chan_type = cli_credentials_get_secure_channel_type(creds);
client_account = cli_credentials_get_username(creds);
server_netbios_domain = cli_credentials_get_domain(creds);
server_dns_domain = cli_credentials_get_realm(creds);
return rpccli_create_netlogon_creds(server_computer,
server_netbios_domain,
server_dns_domain,
client_account,
sec_chan_type,
msg_ctx, mem_ctx,
creds_ctx);
}
NTSTATUS rpccli_create_netlogon_creds_with_creds(struct cli_credentials *creds,
const char *server_computer,
struct messaging_context *msg_ctx,
TALLOC_CTX *mem_ctx,
struct netlogon_creds_cli_context **netlogon_creds)
{
enum netr_SchannelType sec_chan_type;
const char *server_netbios_domain;
const char *client_account;
sec_chan_type = cli_credentials_get_secure_channel_type(creds);
if (sec_chan_type == SEC_CHAN_NULL) {
return NT_STATUS_INVALID_PARAMETER_MIX;
}
client_account = cli_credentials_get_username(creds);
server_netbios_domain = cli_credentials_get_domain(creds);
return rpccli_create_netlogon_creds(server_computer,
server_netbios_domain,
client_account,
sec_chan_type,
msg_ctx, mem_ctx,
netlogon_creds);
}
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 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 */
nt_status = dcerpc_schannel_creds(p->conn->security_state.generic_state, samsync_ctx, &creds);
if (!NT_STATUS_IS_OK(nt_status)) {
r->out.error_string = talloc_strdup(mem_ctx, "Could not obtain NETLOGON credentials from DCERPC/GENSEC layer");
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 inconsistancy. Should not get error %s here", nt_errstr(nt_status));
talloc_free(samsync_ctx);
return dbsync_nt_status;
}
nt_status = NT_STATUS_OK;
}
talloc_free(samsync_ctx);
return nt_status;
}
NTSTATUS trust_pw_change(struct netlogon_creds_cli_context *context,
struct messaging_context *msg_ctx,
struct dcerpc_binding_handle *b,
const char *domain,
bool force)
{
TALLOC_CTX *frame = talloc_stackframe();
struct trust_pw_change_state *state;
struct cli_credentials *creds = NULL;
const struct samr_Password *current_nt_hash = NULL;
const struct samr_Password *previous_nt_hash = NULL;
enum netr_SchannelType sec_channel_type = SEC_CHAN_NULL;
time_t pass_last_set_time;
uint32_t old_version = 0;
struct pdb_trusted_domain *td = NULL;
struct timeval g_timeout = { 0, };
int timeout = 0;
struct timeval tv = { 0, };
size_t new_len = DEFAULT_TRUST_ACCOUNT_PASSWORD_LENGTH;
uint8_t new_password_buffer[256 * 2] = { 0, };
char *new_trust_passwd = NULL;
size_t len = 0;
uint32_t new_version = 0;
uint32_t *new_trust_version = NULL;
NTSTATUS status;
bool ok;
state = talloc_zero(frame, struct trust_pw_change_state);
if (state == NULL) {
TALLOC_FREE(frame);
return NT_STATUS_NO_MEMORY;
}
state->g_ctx = g_lock_ctx_init(state, msg_ctx);
if (state->g_ctx == NULL) {
TALLOC_FREE(frame);
return NT_STATUS_NO_MEMORY;
}
state->g_lock_key = talloc_asprintf(state,
"trust_password_change_%s",
domain);
if (state->g_lock_key == NULL) {
TALLOC_FREE(frame);
return NT_STATUS_NO_MEMORY;
}
g_timeout = timeval_current_ofs(10, 0);
status = g_lock_lock(state->g_ctx,
state->g_lock_key,
G_LOCK_WRITE, g_timeout);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(1, ("could not get g_lock on [%s]!\n",
state->g_lock_key));
TALLOC_FREE(frame);
return status;
}
talloc_set_destructor(state, trust_pw_change_state_destructor);
status = pdb_get_trust_credentials(domain, NULL, frame, &creds);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(0, ("could not fetch domain creds for domain %s - %s!\n",
domain, nt_errstr(status)));
TALLOC_FREE(frame);
return NT_STATUS_TRUSTED_RELATIONSHIP_FAILURE;
}
current_nt_hash = cli_credentials_get_nt_hash(creds, frame);
if (current_nt_hash == NULL) {
DEBUG(0, ("cli_credentials_get_nt_hash failed for domain %s!\n",
domain));
TALLOC_FREE(frame);
return NT_STATUS_TRUSTED_RELATIONSHIP_FAILURE;
}
old_version = cli_credentials_get_kvno(creds);
pass_last_set_time = cli_credentials_get_password_last_changed_time(creds);
sec_channel_type = cli_credentials_get_secure_channel_type(creds);
new_version = old_version + 1;
switch (sec_channel_type) {
case SEC_CHAN_WKSTA:
case SEC_CHAN_BDC:
break;
case SEC_CHAN_DNS_DOMAIN:
/*
* new_len * 2 = 498 bytes is the largest possible length
* NL_PASSWORD_VERSION consumes the rest of the possible 512 bytes
* and a confounder with at least 2 bytes is required.
*
* Windows uses new_len = 120 => 240 bytes.
*/
new_len = 120;
/* fall through */
case SEC_CHAN_DOMAIN:
status = pdb_get_trusted_domain(frame, domain, &td);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(0, ("pdb_get_trusted_domain() failed for domain %s - %s!\n",
domain, nt_errstr(status)));
TALLOC_FREE(frame);
return status;
}
new_trust_version = &new_version;
break;
default:
TALLOC_FREE(frame);
return NT_STATUS_NOT_SUPPORTED;
}
timeout = lp_machine_password_timeout();
if (timeout == 0) {
if (!force) {
DEBUG(10,("machine password never expires\n"));
TALLOC_FREE(frame);
return NT_STATUS_OK;
}
}
tv.tv_sec = pass_last_set_time;
DEBUG(10, ("password last changed %s\n",
timeval_string(talloc_tos(), &tv, false)));
tv.tv_sec += timeout;
DEBUGADD(10, ("password valid until %s\n",
timeval_string(talloc_tos(), &tv, false)));
if (!force && !timeval_expired(&tv)) {
TALLOC_FREE(frame);
return NT_STATUS_OK;
}
/*
* Create a random machine account password
* We create a random buffer and convert that to utf8.
* This is similar to what windows is doing.
*/
generate_secret_buffer(new_password_buffer, new_len * 2);
ok = convert_string_talloc(frame,
CH_UTF16MUNGED, CH_UTF8,
new_password_buffer, new_len * 2,
(void *)&new_trust_passwd, &len);
ZERO_STRUCT(new_password_buffer);
if (!ok) {
DEBUG(0, ("convert_string_talloc failed\n"));
TALLOC_FREE(frame);
return NT_STATUS_NO_MEMORY;
}
/*
* We could use cli_credentials_get_old_nt_hash(creds, frame) to
* set previous_nt_hash.
*
* But we want to check if the dc has our current password and only do
* a change if that's the case. So we keep previous_nt_hash = NULL.
*
* TODO:
* If the previous password is the only password in common with the dc,
* we better skip the password change, or use something like
* ServerTrustPasswordsGet() or netr_ServerGetTrustInfo() to fix our
* local secrets before doing the change.
*/
status = netlogon_creds_cli_auth(context, b,
*current_nt_hash,
previous_nt_hash);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(0, ("netlogon_creds_cli_auth for domain %s - %s!\n",
domain, nt_errstr(status)));
TALLOC_FREE(frame);
return status;
}
/*
* Return the result of trying to write the new password
* back into the trust account file.
*/
switch (sec_channel_type) {
case SEC_CHAN_WKSTA:
case SEC_CHAN_BDC:
ok = secrets_store_machine_password(new_trust_passwd, domain, sec_channel_type);
if (!ok) {
DEBUG(0, ("secrets_store_machine_password failed for domain %s!\n",
domain));
TALLOC_FREE(frame);
return NT_STATUS_INTERNAL_DB_CORRUPTION;
}
break;
case SEC_CHAN_DNS_DOMAIN:
case SEC_CHAN_DOMAIN:
/*
* we need to get the sid first for the
* pdb_set_trusteddom_pw call
*/
ok = pdb_set_trusteddom_pw(domain, new_trust_passwd,
&td->security_identifier);
if (!ok) {
DEBUG(0, ("pdb_set_trusteddom_pw() failed for domain %s!\n",
domain));
TALLOC_FREE(frame);
return NT_STATUS_INTERNAL_DB_CORRUPTION;
}
break;
default:
smb_panic("Unsupported secure channel type");
break;
}
DEBUG(1,("%s : %s(%s): Changed password locally\n",
current_timestring(talloc_tos(), false), __func__, domain));
status = netlogon_creds_cli_ServerPasswordSet(context, b,
new_trust_passwd,
new_trust_version);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(0,("%s : %s(%s) remote password change set failed - %s\n",
current_timestring(talloc_tos(), false), __func__,
domain, nt_errstr(status)));
TALLOC_FREE(frame);
return status;
}
DEBUG(1,("%s : %s(%s): Changed password remotely.\n",
current_timestring(talloc_tos(), false), __func__, domain));
TALLOC_FREE(frame);
return NT_STATUS_OK;
}
