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description= Set up backend mTLS to let both the load balancer and its backends mutually authenticate each other.;
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store section click add intermediate ca and upload the pem encoded certificate file or copy the contents of the certificate this step lets you add another level of trust between the root certificate and your server certificate click add to add the intermediary ca to add the certificate that you added to the allowlist click add click create verify that the new trust config resource appears in the list of configurations gcloud create a trust config yaml file trust_config yaml that specifies the trust config parameters this example trust config resource contains a trust store with a trust anchor and an intermediate certificate this example trust config resource reads the certificate content from the environment variables created in the previous format the certificates step cat eof trust_config yaml truststores trustanchors pemcertificate root_cert intermediatecas pemcertificate intermediate_cert eof to create a trust store with additional trust anchors or intermediate certificates add pemcertificate rows in the appropriate section to import the trust config yaml file use the gcloud certificate manager trust configs import command global for global external application load balancers and cross region internal application load balancers specify global as the location where the trust config resource is stored gcloud certificate manager trust configs import trust_config_name source trust_config yaml location global replace trust_config_name with the name of the trust config regional for regional external application load balancers and regional internal application load balancers specify the region where the trust config resource is stored gcloud certificate manager trust configs import trust_config_name source trust_config yaml location region replace the following trust_config_name the name of the trust config resource region the region where the trust config resource is stored create a client certificate important you cannot attach the client certificate to the backend authentication config resource after the backend authentication config resource has been created to enable backend mtls you must create a client certificate before you configure the backend authentication config resource in backend mtls the load balancer acts as the client and the backend acts as the server to enable backend mtls the load balancer needs to prove its identity to the backend this authentication is carried out using a client certificate that the load balancer presents to the backend the backend server needs to validate the client certificate using its own trust chain when connecting to a backend server the load balancer sets the server name indication sni to the hostname specified in the tls configuration the backend server selects the appropriate ssl tls certificate based on this sni value the load balancer expects the sni value to match a subject alternative name san listed in the backend server s certificate client certificates can be managed certificates from a private ca through certificate authority service or self managed private pki certificates in this example the client certificate is issued using self managed certificates this section uses the openssl library to create the root ca certificate and the client certificate to create a client certificate complete the following steps create an openssl configuration file in the following example the configuration file example cnf contains the ca_exts section which specifies x 509 extensions that mark the certificate as suitable for a certificate authority ca the extendedkeyusage attribute is set to clientauth to learn more about the requirements for root and intermediate certificates see certificate requirements cat example cnf eof req distinguished_name empty_distinguished_name empty_distinguished_name kept empty to allow setting via subj command line argument ca_exts basicconstraints critical ca true keyusage keycertsign extendedkeyusage clientauth eof create a self signed x 509 root ca certificate root cert the root certificate is self signed with its own private key root key openssl req x509 new sha256 newkey rsa 2048 nodes days 3650 subj cn root config example cnf extensions ca_exts keyout root key out root cert create a configuration file to generate the csr for the client certificate the following configuration file client config contains the extension_requirements section which specifies the x 509 extensions to include in the csr to learn more about the requirements for client certificates see certificate requirements cat client config eof req default_bits 2048 req_extensions extension_requirements distinguished_name dn_requirements prompt no extension_requirements basicconstraints critical ca false keyusage critical nonrepudiation digitalsignature keyencipherment extendedkeyusage clientauth dn_requirements countryname us stateorprovincename california localityname san francisco 0 organizationname example organizationalunitname test commonname test example com emailaddress test example com eof create the csr client csr for the client certificate openssl req new config client config keyout client key out client csr create the client certificate client cert from the csr the csr is signed by the root ca certificate to issue the x 509 client certificate openssl x509 req cakey root key ca root cert days 365 extfile client config extensions extension_requirements in client csr out client cert upload the client certificate to certificate manager to upload the client certificate to certificate manager complete the following steps console in the google cloud console go to the certificate manager page go to certificate manager on the certificates tab click add certificate enter a name for the certificate this name must be unique for the project optional enter a description for the certificate the description helps you identify a specific certificate later for location select global or regional the location denotes where the trust config resource is stored for global external application load balancers and cross region internal application load balancers create a global trust config resource for regional external application load balancers and regional internal application load balancers create a regional trust config resource for scope select client authentication for certificate type choose create self managed certificate for the certificate field upload a pem encoded certificate file or copy and paste the contents of a pem encoded certificate for the private key certificate field upload a pem encoded private key that isn t protected with a passphrase or copy and paste the contents of the pem encoded private key specify a label to associate to the certificate you can add more than one label if needed to add a label click the add_box add label button and specify a key and a value for your label click create verify that the new certificate appears in the list of certificates gcloud to upload the client certificate to certificate manager use the gcloud certificate manager certificates create command the scope of this certificate is client auth which indicates that this certificate is used as a client certificate in backend mtls global for global external application load balancers and cross region internal application load balancers create a global certificate manager certificate gcloud certificate manager certificates create client_ certificate_name certificate file client cert private key file client key scope client auth location global replace client_certificate_name with the name of the client certificate resource this client certificate with the scope client auth is used by the backend authentication config resource regional for regional external application load balancers and regional internal application load balancers create a regional certificate manager certificate gcloud certificate manager certificates create client_ certificate_name certificate file client cert private key file client key scope client auth location region replace the following client_certificate_name the name of the client certificate resource this client certificate with the scope client auth is used by the backend authentication config resource region the region where the certificate is to be created create a backend authentication config resource to create a backend authentication config backendauthenticationconfig resource complete the following steps console in the google cloud console go to the authentication configuration page go to authentication configuration on the backend authentication tab click create enter a name for the backend authentication config resource for location select global or regional select the client certificate resource that you created earlier optional select the public roots of trust select the trust config resource that you created earlier optional click equivalent code to view the terraform configuration for this resource click create verify that the backend authentication config resource is displayed gcloud create a yaml file that declaratively specifies the different attributes of the backend authentication config resource global for global external application load balancers and cross region internal application load balancers create a global backend authentication config resource attach the client certificate to the backend authentication config resource to enable backend mtls cat backend_authentication_config_resource_filename yaml name projects project_id locations global backendauthenticationconfigs backend_auth_config_name trustconfig projects project_id locations global trustconfigs trust_config_name clientcertificate projects project_id locations global certificates client_ certificate_name wellknownroots public_roots eof replace the following backend_authentication_config_resource_filename the name of the yaml file where the backend authentication config resource is defined project_id the id of your google cloud project backend_auth_config_name the name of the backend authentication config resource trust_config_name the name of the trust config resource that you created earlier client_certificate_name the name of the client certificate resource that you created earlier regional for regional external application load balancers and regional internal application load balancers create a regional backend authentication config resource attach the client certificate to the backend authentication config resource to enable backend mtls cat backend_authentication_config_resource_filename yaml name projects project_id locations region backendauthenticationconfigs backend_auth_config_name trustconfig projects project_id locations region trustconfigs trust_config_name clientcertificate projects project_id locations region certificates client_ certificate_name wellknownroots public_roots eof replace the following backend_authentication_config_resource_filename the name of the yaml file where the backend authentication config resource is defined project_id the id of your google cloud project region the name of the region backend_auth_config_name the name of the backend authentication config resource trust_config_name the name of the trust config resource that you created earlier client_certificate_name the name of the client certificate resource that you created earlier to import the backend authentication config use the gcloud network security backend authentication configs import command global for global external application load balancers and cross region internal application load balancers set the location flag to global gcloud network security backend authentication configs import backend_auth_config_name source backend_authentication_config_resource_filename yaml location global replace the following backend_auth_config_name the name of the backend authentication config resource backend_authentication_config_resource_filename the name of the yaml file where the backend authentication config resource is defined regional for regional external application load balancers and regional internal application load balancers set the location flag to the region where the load balancer is configured gcloud network security backend authentication configs import backend_auth_config_name source backend_authentication_config_resource_filename yaml location region replace the following backend_auth_config_name the name of the backend authentication config resource backend_authentication_config_resource_filename the name of the yaml file where the backend authentication config resource is defined region the region where the load balancer is configured attach the backend authentication config resource to the backend service of the load balancer to attach the backend authentication config backendauthenticationconfig resource to the backend service of the load balancer complete the following steps console in the google cloud console go to the load balancing page go to load balancing on the backends tab select the backend service for which you need to enable backend authenticated tls and backend mtls click edit edit expand the advanced configurations section in the backend authentication section select the enable checkbox optional specify the sni hostname and accepted sans to validate the backend certificate to attach the backend authentication config resource to the backend service in the backend authentication config list select the backend authentication config resource click continue to update the backend service settings click update gcloud to list all the backend service resources in your project use the gcloud compute backend services list command gcloud compute backend services list note the name of the backend service to attach the backendauthenticationconfig resource to this name is referred to as backend_service_name in the following steps to export the backend service configuration to a file use the gcloud compute backend services export command global for global external application load balancers and cross region internal application load balancers set the location flag to global gcloud compute backend services export backend_service_name destination backend_service_filename yaml global replace the following backend_service_name the name of the backend service backend_service_filename the name and path to a yaml file where the backend service configuration is exported regional for regional external application load balancers and regional internal application load balancers set the location flag to the region where the load balancer is configured gcloud compute backend services export backend_service_name destination backend_service_filename yaml region region replace the following backend_service_name the name of the backend service backend_service_filename the name and path to a yaml file where the backend service configuration is exported region the name of the google cloud region where the backend service is located update the tlssettings attribute of the backend service poin...
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