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|Trusted Extensions Configuration and Administration Oracle Solaris 11 Information Library|
A Trusted Extensions system is installed with a default set of security templates that are used to define the label properties of remote hosts. In Trusted Extensions, both unlabeled hosts and labeled hosts on the network are assigned security attributes by means of a security template. Hosts that are not assigned a template cannot communicate with hosts that are configured with Trusted Extensions. The templates are stored locally.
Hosts can be added to a security template by IP address or as part of a range of IP addresses. For further explanation, see Trusted Network Fallback Mechanism.
Each host type has its own set of additional required and optional security attributes. The following security attributes are specified in security templates:
The Default label attribute is specific to the host type unlabeled. For details, see Default Label in Security Templates.
DOI – A positive, non-zero integer that identifies the domain of interpretation. The DOI is used to indicate which set of label encodings applies to a network communication or network entity. Labels with different DOIs, even if otherwise identical, are disjoint. For unlabeled hosts, the DOI applies to the default label. In Trusted Extensions, the default value is 1.
Auxiliary label set – Optional. Specifies a discrete set of security labels for a security template. In addition to their accreditation range that is determined by the maximum and minimum labels, hosts that are added to a template with an auxiliary label set can send and receive packets that match any one of the labels in the label set. The maximum number of auxiliary labels that can be specified is four.
Trusted Extensions supports two host types in the trusted network databases and provides two default templates:
CIPSO host type – Intended for hosts that run trusted operating systems. Trusted Extensions supplies the template named cipso for this host type.
The Common IP Security Option (CIPSO) protocol is used to specify security labels that are passed in the IP options field. CIPSO labels are derived automatically from the data's label. Tag type 1 is used to pass the CIPSO security label. This label is then used to make security checks at the IP level and to label the data in the network packet.
Unlabeled host type - Intended for hosts that use standard networking protocols but do not support CIPSO options. Trusted Extensions supplies the template named admin_low for this host type.
This host type is assigned to hosts that run the Oracle Solaris OS or other unlabeled operating systems. This host type gives provides a default label and a default clearance to apply to communications with the unlabeled host. Also, a label range or a set of discrete labels can be specified to allow the sending of packets to an unlabeled gateway for forwarding.
Caution - The admin_low template provides an example for constructing unlabeled templates with site-specific labels. While the admin_low template is required for the installation of Trusted Extensions, the security attributes might be too liberal for normal system operations. Retain the provided templates without modification for system maintenance and support reasons.
Templates for the unlabeled host type specify a default label. This label is used to control communications with hosts whose operating systems are not aware of labels, such as Oracle Solaris systems. The default label that is assigned reflects the level of trust that is appropriate for the host and its users.
Because communications with unlabeled hosts are essentially limited to the default label, these hosts are also referred to as single-label hosts. A technical reason to call these hosts “single-label” is that these hosts do not have admin_high and admin_low labels.
Organizations that use the same Domain of Interpretation (DOI) agree among themselves to interpret label information and other security attributes in the same way. When Trusted Extensions performs a label comparison, a check is made as to whether the DOI is equal.
A Trusted Extensions system enforces label policy on one DOI value. All zones on a Trusted Extensions system must operate at the same DOI. A Trusted Extensions system does not provide exception handling on packets that are received from a system that uses a different DOI.
If your site uses a DOI value that is different from the default value, you must use this value in every security template, as described in How to Configure the Domain of Interpretation.
The minimum label and maximum label attributes are used to establish the label range for labeled and unlabeled hosts. These attributes are used to do the following:
To set the range of labels that can be used when communicating with a remote CIPSO host
In order for a packet to be sent to a destination host, the label of the packet must be within the label range assigned in the destination host's security template.
To set a label range for packets that are being forwarded through a CIPSO gateway or an unlabeled gateway
The label range can be specified in the template for an unlabeled host type. The label range enables the host to forward packets that are not necessarily at the label of the host, but are within a specified label range.
The auxiliary label set defines at most four discrete labels at which packets can be accepted, forwarded, or sent by the remote host. This attribute is optional. By default, no auxiliary label set is defined.