s3-winbindd: Listen on IRPC and do forwarded DNS updates on an RODC

Change-Id: Ib87933c318f510d95f7008e122216d73803ede68
Signed-off-by: Andrew Bartlett <abartlet@samba.org>
Reviewed-by: Andreas Schneider <asn@samba.org>

2 files changed, 279 insertions, 0 deletions

diff --git a/libcli/auth/netlogon_creds_cli.c b/libcli/auth/netlogon_creds_cli.c
index 472a45272c7..05a30da98cf 100644
--- a/libcli/auth/netlogon_creds_cli.c
+++ b/libcli/auth/netlogon_creds_cli.c
@@ -2568,3 +2568,268 @@ NTSTATUS netlogon_creds_cli_LogonSamLogon(
 	TALLOC_FREE(frame);
 	return status;
 }
+
+struct netlogon_creds_cli_DsrUpdateReadOnlyServerDnsRecords_state {
+	struct tevent_context *ev;
+	struct netlogon_creds_cli_context *context;
+	struct dcerpc_binding_handle *binding_handle;
+
+	char *srv_name_slash;
+	enum dcerpc_AuthType auth_type;
+	enum dcerpc_AuthLevel auth_level;
+
+	const char *site_name;
+	uint32_t dns_ttl;
+	struct NL_DNS_NAME_INFO_ARRAY *dns_names;
+
+	struct netlogon_creds_CredentialState *creds;
+	struct netlogon_creds_CredentialState tmp_creds;
+	struct netr_Authenticator req_auth;
+	struct netr_Authenticator rep_auth;
+};
+
+static void netlogon_creds_cli_DsrUpdateReadOnlyServerDnsRecords_cleanup(struct tevent_req *req,
+						     NTSTATUS status);
+static void netlogon_creds_cli_DsrUpdateReadOnlyServerDnsRecords_locked(struct tevent_req *subreq);
+
+struct tevent_req *netlogon_creds_cli_DsrUpdateReadOnlyServerDnsRecords_send(TALLOC_CTX *mem_ctx,
+									     struct tevent_context *ev,
+									     struct netlogon_creds_cli_context *context,
+									     struct dcerpc_binding_handle *b,
+									     const char *site_name,
+									     uint32_t dns_ttl,
+									     struct NL_DNS_NAME_INFO_ARRAY *dns_names)
+{
+	struct tevent_req *req;
+	struct netlogon_creds_cli_DsrUpdateReadOnlyServerDnsRecords_state *state;
+	struct tevent_req *subreq;
+	bool ok;
+
+	req = tevent_req_create(mem_ctx, &state,
+				struct netlogon_creds_cli_DsrUpdateReadOnlyServerDnsRecords_state);
+	if (req == NULL) {
+		return NULL;
+	}
+
+	state->ev = ev;
+	state->context = context;
+	state->binding_handle = b;
+
+	state->srv_name_slash = talloc_asprintf(state, "\\\\%s",
+						context->server.computer);
+	if (tevent_req_nomem(state->srv_name_slash, req)) {
+		return tevent_req_post(req, ev);
+	}
+
+	state->site_name = site_name;
+	state->dns_ttl = dns_ttl;
+	state->dns_names = dns_names;
+
+	dcerpc_binding_handle_auth_info(state->binding_handle,
+					&state->auth_type,
+					&state->auth_level);
+
+	subreq = netlogon_creds_cli_lock_send(state, state->ev,
+					      state->context);
+	if (tevent_req_nomem(subreq, req)) {
+		return tevent_req_post(req, ev);
+	}
+
+	tevent_req_set_callback(subreq,
+				netlogon_creds_cli_DsrUpdateReadOnlyServerDnsRecords_locked,
+				req);
+
+	return req;
+}
+
+static void netlogon_creds_cli_DsrUpdateReadOnlyServerDnsRecords_cleanup(struct tevent_req *req,
+							 NTSTATUS status)
+{
+	struct netlogon_creds_cli_DsrUpdateReadOnlyServerDnsRecords_state *state =
+		tevent_req_data(req,
+		struct netlogon_creds_cli_DsrUpdateReadOnlyServerDnsRecords_state);
+
+	if (state->creds == NULL) {
+		return;
+	}
+
+	if (!NT_STATUS_EQUAL(status, NT_STATUS_NETWORK_ACCESS_DENIED) &&
+	    !NT_STATUS_EQUAL(status, NT_STATUS_IO_TIMEOUT) &&
+	    !NT_STATUS_EQUAL(status, NT_STATUS_DOWNGRADE_DETECTED) &&
+	    !NT_STATUS_EQUAL(status, NT_STATUS_ACCESS_DENIED) &&
+	    !NT_STATUS_EQUAL(status, NT_STATUS_RPC_SEC_PKG_ERROR)) {
+		TALLOC_FREE(state->creds);
+		return;
+	}
+
+	netlogon_creds_cli_delete(state->context, &state->creds);
+}
+
+static void netlogon_creds_cli_DsrUpdateReadOnlyServerDnsRecords_done(struct tevent_req *subreq);
+
+static void netlogon_creds_cli_DsrUpdateReadOnlyServerDnsRecords_locked(struct tevent_req *subreq)
+{
+	struct tevent_req *req =
+		tevent_req_callback_data(subreq,
+		struct tevent_req);
+	struct netlogon_creds_cli_DsrUpdateReadOnlyServerDnsRecords_state *state =
+		tevent_req_data(req,
+		struct netlogon_creds_cli_DsrUpdateReadOnlyServerDnsRecords_state);
+	NTSTATUS status;
+
+	status = netlogon_creds_cli_lock_recv(subreq, state,
+					      &state->creds);
+	TALLOC_FREE(subreq);
+	if (tevent_req_nterror(req, status)) {
+		return;
+	}
+
+	if (state->auth_type == DCERPC_AUTH_TYPE_SCHANNEL) {
+		switch (state->auth_level) {
+		case DCERPC_AUTH_LEVEL_INTEGRITY:
+		case DCERPC_AUTH_LEVEL_PRIVACY:
+			break;
+		default:
+			tevent_req_nterror(req, NT_STATUS_INVALID_PARAMETER_MIX);
+			return;
+		}
+	} else {
+		uint32_t tmp = state->creds->negotiate_flags;
+
+		if (tmp & NETLOGON_NEG_AUTHENTICATED_RPC) {
+			/*
+			 * if DCERPC_AUTH_TYPE_SCHANNEL is supported
+			 * it should be used, which means
+			 * we had a chance to verify no downgrade
+			 * happened.
+			 *
+			 * This relies on netlogon_creds_cli_check*
+			 * being called before, as first request after
+			 * the DCERPC bind.
+			 */
+			tevent_req_nterror(req, NT_STATUS_INVALID_PARAMETER_MIX);
+			return;
+		}
+	}
+
+	/*
+	 * we defer all callbacks in order to cleanup
+	 * the database record.
+	 */
+	tevent_req_defer_callback(req, state->ev);
+
+	state->tmp_creds = *state->creds;
+	netlogon_creds_client_authenticator(&state->tmp_creds,
+					    &state->req_auth);
+	ZERO_STRUCT(state->rep_auth);
+
+	subreq = dcerpc_netr_DsrUpdateReadOnlyServerDnsRecords_send(state, state->ev,
+								    state->binding_handle,
+								    state->srv_name_slash,
+								    state->tmp_creds.computer_name,
+								    &state->req_auth,
+								    &state->rep_auth,
+								    state->site_name,
+								    state->dns_ttl,
+								    state->dns_names);
+	if (tevent_req_nomem(subreq, req)) {
+		status = NT_STATUS_NO_MEMORY;
+		netlogon_creds_cli_DsrUpdateReadOnlyServerDnsRecords_cleanup(req, status);
+		return;
+	}
+
+	tevent_req_set_callback(subreq,
+				netlogon_creds_cli_DsrUpdateReadOnlyServerDnsRecords_done,
+				req);
+}
+
+static void netlogon_creds_cli_DsrUpdateReadOnlyServerDnsRecords_done(struct tevent_req *subreq)
+{
+	struct tevent_req *req =
+		tevent_req_callback_data(subreq,
+		struct tevent_req);
+	struct netlogon_creds_cli_DsrUpdateReadOnlyServerDnsRecords_state *state =
+		tevent_req_data(req,
+		struct netlogon_creds_cli_DsrUpdateReadOnlyServerDnsRecords_state);
+	NTSTATUS status;
+	NTSTATUS result;
+	bool ok;
+
+	status = dcerpc_netr_DsrUpdateReadOnlyServerDnsRecords_recv(subreq, state,
+								    &result);
+	TALLOC_FREE(subreq);
+	if (tevent_req_nterror(req, status)) {
+		netlogon_creds_cli_DsrUpdateReadOnlyServerDnsRecords_cleanup(req, status);
+		return;
+	}
+
+	ok = netlogon_creds_client_check(&state->tmp_creds,
+					 &state->rep_auth.cred);
+	if (!ok) {
+		status = NT_STATUS_ACCESS_DENIED;
+		tevent_req_nterror(req, status);
+		netlogon_creds_cli_DsrUpdateReadOnlyServerDnsRecords_cleanup(req, status);
+		return;
+	}
+
+	if (tevent_req_nterror(req, result)) {
+		netlogon_creds_cli_DsrUpdateReadOnlyServerDnsRecords_cleanup(req, result);
+		return;
+	}
+
+	*state->creds = state->tmp_creds;
+	status = netlogon_creds_cli_store(state->context,
+					  &state->creds);
+	if (tevent_req_nterror(req, status)) {
+		netlogon_creds_cli_DsrUpdateReadOnlyServerDnsRecords_cleanup(req, status);
+		return;
+	}
+
+	tevent_req_done(req);
+}
+
+NTSTATUS netlogon_creds_cli_DsrUpdateReadOnlyServerDnsRecords_recv(struct tevent_req *req)
+{
+	NTSTATUS status;
+
+	if (tevent_req_is_nterror(req, &status)) {
+		netlogon_creds_cli_DsrUpdateReadOnlyServerDnsRecords_cleanup(req, status);
+		tevent_req_received(req);
+		return status;
+	}
+
+	tevent_req_received(req);
+	return NT_STATUS_OK;
+}
+
+NTSTATUS netlogon_creds_cli_DsrUpdateReadOnlyServerDnsRecords(
+				struct netlogon_creds_cli_context *context,
+				struct dcerpc_binding_handle *b,
+				const char *site_name,
+				uint32_t dns_ttl,
+				struct NL_DNS_NAME_INFO_ARRAY *dns_names)
+{
+	TALLOC_CTX *frame = talloc_stackframe();
+	struct tevent_context *ev;
+	struct tevent_req *req;
+	NTSTATUS status = NT_STATUS_NO_MEMORY;
+
+	ev = samba_tevent_context_init(frame);
+	if (ev == NULL) {
+		goto fail;
+	}
+	req = netlogon_creds_cli_DsrUpdateReadOnlyServerDnsRecords_send(frame, ev, context, b,
+									site_name,
+									dns_ttl,
+									dns_names);
+	if (req == NULL) {
+		goto fail;
+	}
+	if (!tevent_req_poll_ntstatus(req, ev, &status)) {
+		goto fail;
+	}
+	status = netlogon_creds_cli_DsrUpdateReadOnlyServerDnsRecords_recv(req);
+ fail:
+	TALLOC_FREE(frame);
+	return status;
+}
diff --git a/libcli/auth/netlogon_creds_cli.h b/libcli/auth/netlogon_creds_cli.h
index 90d01826d06..a910259a88b 100644
--- a/libcli/auth/netlogon_creds_cli.h
+++ b/libcli/auth/netlogon_creds_cli.h
@@ -132,5 +132,19 @@ NTSTATUS netlogon_creds_cli_LogonSamLogon(
 				union netr_Validation **validation,
 				uint8_t *authoritative,
 				uint32_t *flags);
+struct tevent_req *netlogon_creds_cli_DsrUpdateReadOnlyServerDnsRecords_send(TALLOC_CTX *mem_ctx,
+									     struct tevent_context *ev,
+									     struct netlogon_creds_cli_context *context,
+									     struct dcerpc_binding_handle *b,
+									     const char *site_name,
+									     uint32_t dns_ttl,
+									     struct NL_DNS_NAME_INFO_ARRAY *dns_names);
+NTSTATUS netlogon_creds_cli_DsrUpdateReadOnlyServerDnsRecords_recv(struct tevent_req *req);
+NTSTATUS netlogon_creds_cli_DsrUpdateReadOnlyServerDnsRecords(
+				struct netlogon_creds_cli_context *context,
+				struct dcerpc_binding_handle *b,
+				const char *site_name,
+				uint32_t dns_ttl,
+				struct NL_DNS_NAME_INFO_ARRAY *dns_names);
 
 #endif /* NETLOGON_CREDS_CLI_H */