static bool net_g_lock_init(TALLOC_CTX *mem_ctx,
struct tevent_context **pev,
struct messaging_context **pmsg,
struct g_lock_ctx **pg_ctx)
{
struct tevent_context *ev = NULL;
struct messaging_context *msg = NULL;
struct g_lock_ctx *g_ctx = NULL;
ev = samba_tevent_context_init(mem_ctx);
if (ev == NULL) {
d_fprintf(stderr, "ERROR: could not init event context\n");
goto fail;
}
msg = messaging_init(mem_ctx, ev);
if (msg == NULL) {
d_fprintf(stderr, "ERROR: could not init messaging context\n");
goto fail;
}
g_ctx = g_lock_ctx_init(mem_ctx, msg);
if (g_ctx == NULL) {
d_fprintf(stderr, "ERROR: could not init g_lock context\n");
goto fail;
}
*pev = ev;
*pmsg = msg;
*pg_ctx = g_ctx;
return true;
fail:
TALLOC_FREE(g_ctx);
TALLOC_FREE(msg);
TALLOC_FREE(ev);
return false;
}
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;
}
