It is possible to store some sensitive information secretly in HashiCorp Vault KV Secrets Engine - Version 2. Secrets can be saved for:
Zabbix provides read-only access to the secrets in Vault, assuming that secrets are managed by someone else.
It is possible to store user macro values secretly in Vault.
A “Vault secret” value of a user macro contains a reference path (as 'path:key', for example “secret/zabbix:password”).
The following commands may be used to set the value for the path mentioned in example:
# Enable "secret/" mount point if not already enabled, note that "kv-v2" must be used $ vault secrets enable -path=secret/ kv-v2 # Put new secret with key password under mount point "secret/" and path "secret/zabbix" $ vault kv put secret/zabbix password=<password> # Test that secret is successfully added $ vault kv get secret/zabbix # Finally test with Curl, note that "data" need to be manually added after mount point and "/v1" before the mount point, also see --capath parameter $ curl --header "X-Vault-Token: <VaultToken>" https://127.0.0.1:8200/v1/secret/data/zabbix
The secret value is retrieved by Zabbix server on every refresh of configuration data and is stored in configuration cache. The authentication token for a read-only access to the reference paths must be provided in server configuration ('VaultToken' parameter). If the macro value cannot be retrieved successfully the corresponding item using the value will turn unsupported.
It is also possible to trigger refresh of secret values from Vault, using a 'secrets_reload' command line option.
Zabbix proxy never communicates with Vault to get any secrets other than database credentials. Secret values on Zabbix proxy are retrieved from Zabbix server on each configuration sync and stored in configuration cache the same way as on Zabbix server.
That means a Zabbix proxy cannot start data collection after a restart until it receives the configuration data update from Zabbix server for the first time. Encryption must be enabled between Zabbix server and proxy; otherwise a server warning message is logged.
It is supported to store database credentials used by Zabbix server, proxies and frontend secretly in Vault:
Database credentials retrieved from Vault will be cached by the frontend. Note that the filesystem temporary file directory is used for database credential caching in frontend. You may use the ZBX_DATA_CACHE_TTL constant to control how often the data cache is refreshed/invalidated.
The following commands may be used to set the values for the path mentioned in example:
# Enable "secret/" mount point if not already enabled, note that "kv-v2" must be used $ vault secrets enable -path=secret/ kv-v2 # Put new secrets with keys username and password under mount point "secret/" and path "secret/zabbix/database" $ vault kv put secret/zabbix/database username=zabbix password=<password> # Test that secret is successfully added $ vault kv get secret/zabbix/database # Finally test with Curl, note that "data" need to be manually added after mount point and "/v1" before the mount point, also see --capath parameter $ curl --header "X-Vault-Token: <VaultToken>" https://127.0.0.1:8200/v1/secret/data/zabbix/database
For Zabbix server/proxy new configuration parameters have been added for Vault authentication and retrieving database credentials:
Zabbix server and Zabbix proxy read the Vault-related configuration parameters from zabbix_server.conf and zabbix_proxy.conf upon startup.
Zabbix server and Zabbix proxy will additionally read “VAULT_TOKEN” environment variable once during startup and unset it so that it would not be available through forked scripts; it is an error if both VaultToken and VAULT_TOKEN contain value.
Certificate signed by a certificate authority (CA) should be added to the default CA store. Alternatively a custom CA store location can be specified using the SSLCALocation configuration parameter; note that in this case the certificate directory must be prepared using the openssl c_rehash utility, for example configure SSLCALocation and copy "ca.pem" inside that directory, then run the following command:
$ c_rehash .