Authorizers.xml Setup
The 'authorizers.xml' file is used to define and configure available authorizers. The default authorizer is the StandardManagedAuthorizer. The managed authorizer is comprised of a UserGroupProvider and a AccessPolicyProvider. The users, group, and access policies will be loaded and optionally configured through these providers. The managed authorizer will make all access decisions based on these provided users, groups, and access policies.
During startup there is a check to ensure that there are no two users/groups with the same identity/name. This check is executed regardless of the configured implementation. This is necessary because this is how users/groups are identified and authorized during access decisions.
The default UserGroupProvider is the FileUserGroupProvider, however, you can develop additional UserGroupProviders as extensions. The FileUserGroupProvider has the following properties:
Users File - The file where the FileUserGroupProvider stores users and groups. By default, the 'users.xml' in the 'conf' directory is chosen.
Legacy Authorized Users File - The full path to an existing authorized-users.xml that will be automatically be used to load the users and groups into the Users File.
Initial User Identity - The identity of a users and systems to seed the Users File. The name of each property must be unique, for example: "Initial User Identity A", "Initial User Identity B", "Initial User Identity C" or "Initial User Identity 1", "Initial User Identity 2", "Initial User Identity 3"
Another option for the UserGroupProvider is the LdapUserGroupProvider. By default, this option is commented out but can be configured in lieu of the FileUserGroupProvider. This will sync users and groups from a directory server and will present them in NiFi UI in read only form. The LdapUserGroupProvider has the following properties:
Authentication Strategy - How the connection to the LDAP server is authenticated. Possible values are ANONYMOUS, SIMPLE, LDAPS, or START_TLS
Manager DN - The DN of the manager that is used to bind to the LDAP server to search for users.
Manager Password - The password of the manager that is used to bind to the LDAP server to search for users.
TLS - Keystore - Path to the Keystore that is used when connecting to LDAP using LDAPS or START_TLS.
TLS - Keystore Password - Password for the Keystore that is used when connecting to LDAP using LDAPS or START_TLS.
TLS - Keystore Type - Type of the Keystore that is used when connecting to LDAP using LDAPS or START_TLS (i.e. JKS or PKCS12).
TLS - Truststore - Path to the Truststore that is used when connecting to LDAP using LDAPS or START_TLS.
TLS - Truststore Password - Password for the Truststore that is used when connecting to LDAP using LDAPS or START_TLS.
TLS - Truststore Type - Type of the Truststore that is used when connecting to LDAP using LDAPS or START_TLS (i.e. JKS or PKCS12).
TLS - Client Auth - Client authentication policy when connecting to LDAP using LDAPS or START_TLS. Possible values are REQUIRED, WANT, NONE.
TLS - Protocol - Protocol to use when connecting to LDAP using LDAPS or START_TLS. (i.e. TLS, TLSv1.1, TLSv1.2, etc).
TLS - Shutdown Gracefully - Specifies whether the TLS should be shut down gracefully before the target context is closed. Defaults to false.
Referral Strategy - Strategy for handling referrals. Possible values are FOLLOW, IGNORE, THROW.
Connect Timeout - Duration of connect timeout. (i.e. 10 secs).
Read Timeout - Duration of read timeout. (i.e. 10 secs).
Url - Space-separated list of URLs of the LDAP servers (i.e. ldap://<hostname>:<port>).
Page Size - Sets the page size when retrieving users and groups. If not specified, no paging is performed.
Sync Interval - Duration of time between syncing users and groups. (i.e. 30 mins). Minimum allowable value is 10 secs.
User Search Base - Base DN for searching for users (i.e. ou=users,o=nifi). Required to search users.
User Object Class - Object class for identifying users (i.e. person). Required if searching users.
User Search Scope - Search scope for searching users (ONE_LEVEL, OBJECT, or SUBTREE). Required if searching users.
User Search Filter - Filter for searching for users against the 'User Search Base' (i.e. (memberof=cn=team1,ou=groups,o=nifi) ). Optional.
User Identity Attribute - Attribute to use to extract user identity (i.e. cn). Optional. If not set, the entire DN is used.
User Group Name Attribute - Attribute to use to define group membership (i.e. memberof). Optional. If not set group membership will not be calculated through the users. Will rely on group membership being defined through 'Group Member Attribute' if set. The value of this property is the name of the attribute in the user ldap entry that associates them with a group. The value of that user attribute could be a dn or group name for instance. What value is expected is configured in the 'User Group Name Attribute - Referenced Group Attribute'.
User Group Name Attribute - Referenced Group Attribute - If blank, the value of the attribute defined in 'User Group Name Attribute' is expected to be the full dn of the group. If not blank, this property will define the attribute of the group ldap entry that the value of the attribute defined in 'User Group Name Attribute' is referencing (i.e. name). Use of this property requires that 'Group Search Base' is also configured.
Group Search Base - Base DN for searching for groups (i.e. ou=groups,o=nifi). Required to search groups.
Group Object Class - Object class for identifying groups (i.e. groupOfNames). Required if searching groups.
Group Search Scope - Search scope for searching groups (ONE_LEVEL, OBJECT, or SUBTREE). Required if searching groups.
Group Search Filter - Filter for searching for groups against the 'Group Search Base'. Optional.
Group Name Attribute - Attribute to use to extract group name (i.e. cn). Optional. If not set, the entire DN is used.
Group Member Attribute - Attribute to use to define group membership (i.e. member). Optional. If not set group membership will not be calculated through the groups. Will rely on group membership being defined through 'User Group Name Attribute' if set. The value of this property is the name of the attribute in the group ldap entry that associates them with a user. The value of that group attribute could be a dn or memberUid for instance. What value is expected is configured in the 'Group Member Attribute - Referenced User Attribute'. (i.e. member: cn=User 1,ou=users,o=nifi vs. memberUid: user1)
Group Member Attribute - Referenced User Attribute - If blank, the value of the attribute defined in 'Group Member Attribute' is expected to be the full dn of the user. If not blank, this property will define the attribute of the user ldap entry that the value of the attribute defined in 'Group Member Attribute' is referencing (i.e. uid). Use of this property requires that 'User Search Base' is also configured. (i.e. member: cn=User 1,ou=users,o=nifi vs. memberUid: user1)
Another option for the UserGroupProvider are composite implementations. This means that multiple sources/implementations can be configured and composed. For instance, an admin can configure users/groups to be loaded from a file and a directory server. There are two composite implementations, one that supports multiple UserGroupProviders and one that supports multiple UserGroupProviders and a single configurable UserGroupProvider.
The CompositeUserGroupProvider will provide support for retrieving users and groups from multiple sources. The CompositeUserGroupProvider has the following properties:
User Group Provider - The identifier of user group providers to load from. The name of each property must be unique, for example: "User Group Provider A", "User Group Provider B", "User Group Provider C" or "User Group Provider 1", "User Group Provider 2", "User Group Provider 3"
The CompositeConfigurableUserGroupProvider will provide support for retrieving users and groups from multiple sources. Additionally, a single configurable user group provider is required. Users from the configurable user group provider are configurable, however users loaded from one of the User Group Provider [unique key] will not be. The CompositeConfigurableUserGroupProvider has the following properties:
Configurable User Group Provider - A configurable user group provider.
User Group Provider - The identifier of user group providers to load from. The name of each property must be unique, for example: "User Group Provider A", "User Group Provider B", "User Group Provider C" or "User Group Provider 1", "User Group Provider 2", "User Group Provider 3"
The default AccessPolicyProvider is the FileAccessPolicyProvider, however, you can develop additional AccessPolicyProvider as extensions. The FileAccessPolicyProvider has the following properties:
User Group Provider - The identifier for an User Group Provider defined above that will be used to access users and groups for use in the managed access policies.
Authorizations File - The file where the FileAccessPolicyProvider will store policies.
Initial Admin Identity - The identity of an initial admin user that will be granted access to the UI and given the ability to create additional users, groups, and policies. The value of this property could be a DN when using certificates or LDAP, or a Kerberos principal. This property will only be used when there are no other policies defined. If this property is specified then a Legacy Authorized Users File can not be specified.
Legacy Authorized Users File - The full path to an existing authorized-users.xml that will be automatically converted to the new authorizations model. If this property is specified then an Initial Admin Identity can not be specified, and this property will only be used when there are no other users, groups, and policies defined.
Node Identity - The identity of a NiFi cluster node. When clustered, a property for each node should be defined, so that every node knows about every other node. If not clustered these properties can be ignored. The name of each property must be unique, for example for a three node cluster: "Node Identity A", "Node Identity B", "Node Identity C" or "Node Identity 1", "Node Identity 2", "Node Identity 3"
The identities configured in the Initial Admin Identity, the Node Identity properties, or discovered in a Legacy Authorized Users File must be available in the configured User Group Provider.
The default authorizer is the StandardManagedAuthorizer, however, you can develop additional authorizers as extensions. The StandardManagedAuthorizer has the following properties:
Access Policy Provider - The identifier for an Access Policy Provider defined above.
The FileAuthorizer has been replaced with the more granular StandardManagedAuthorizer approach described above. However, it is still available for backwards compatibility reasons. The FileAuthorizer has the following properties.
Authorizations File - The file where the FileAuthorizer stores policies. By default, the 'authorizations.xml' in the 'conf' directory is chosen.
Users File - The file where the FileAuthorizer stores users and groups. By default, the 'users.xml' in the 'conf' directory is chosen.
Initial Admin Identity - The identity of an initial admin user that is granted access to the UI and given the ability to create additional users, groups, and policies. This property is only used when there are no other users, groups, and policies defined.
Legacy Authorized Users File - The full path to an existing authorized-users.xml that is automatically converted to the multi-tenant authorization model. This property is only used when there are no other users, groups, and policies defined.
Node Identity - The identity of a NiFi cluster node. When clustered, a property for each node should be defined, so that every node knows about every other node. If not clustered, these properties can be ignored.