astronomy

Solaris Trusted Extensions

Solaris Trusted Extensions is a astronomy topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Solaris Trusted Extensions rather than just read about it. In short: Solaris Trusted Extensions is a set of security extensions incorporated in the Solaris 10 operating system by Sun Microsystems, featuring a mandatory access control model. It succeeds Trusted Solaris, a family of security-evaluated operating systems based on earlier versions of Solaris.

Key takeaways

Solaris Trusted Extensions belongs to astronomy; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Solaris Trusted Extensions to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Solaris Trusted Extensions from memory before moving on to harder problems.

Reference excerpt

Solaris Trusted Extensions is a set of security extensions incorporated in the Solaris 10 operating system by Sun Microsystems, featuring a mandatory access control model. It succeeds Trusted Solaris, a family of security-evaluated operating systems based on earlier versions of Solaris. Solaris 10 5/09 is Common Criteria certified at Evaluation Assurance Level EAL4+ against the CAPP, RBACPP, and LSPP protection profiles.

Overview Certain Trusted Solaris features, such as fine-grained privileges, are now part of the standard Solaris 10 release. Beginning with Solaris 10 11/06, Solaris now includes a component called Solaris Trusted Extensions which gives it the additional features necessary to position it as the successor to Trusted Solaris. Inclusion of these features in the mainstream Solaris release marks a significant change from Trusted Solaris, as it is no longer necessary to use a different Solaris release with a modified kernel for labeled security environments. Solaris Trusted Extensions is an OpenSolaris project. Trusted Extensions additions and enhancements include:

Accounting Role-Based Access Control Auditing Device Allocation Mandatory Access Control Labeling Solaris Trusted Extensions enforce a mandatory access control policy on all aspects of the operating system, including device access, file, networking, print and window management services. This is achieved by adding sensitivity labels to objects, thereby establishing explicit relationships between these objects. Only appropriate (and explicit) authorization allows applications and users read and/or write access to the objects. The component also provides labeled security features in a desktop environment. Apart from extending support for the Common Desktop Environment from the Trusted Solaris 8 release, it delivers the first labeled environment based on GNOME. Solaris Trusted Extensions facilitate the access of data at multiple classification levels through a single desktop environment. Solaris Trusted Extensions also delivers labeled device access and labeled network communication (through the CIPSO standard). CIPSO is used to pass security information within and between labeled zones. Solaris Trusted Extensions complies with the Federal Information Processing Standard (FIPS).

Trusted Solaris history 1999 Trusted Solaris 7 1996 Trusted Solaris 2.5.1 - ITSEC Certified for E3 / F-B1 1995 Trusted Solaris 1.2 - ITSEC Certified for E3 / F-B1 1992 SunOS Compartmented Mode Workstation 1.0 - ITSEC Certified for E3 / F-B1 1990 SunOS Multilevel Security 1.0 - TCSEC Conformance (1985 Orange Book)

References

External links Solaris Trusted Extensions Official Website OpenSolaris: Solaris Trusted Extensions project Solaris Trusted Extensions press release

Worked examples

Example 1 — a first encounter with Solaris Trusted Extensions

Start with the simplest possible case. Write down what Solaris Trusted Extensions claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In astronomy, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Solaris Trusted Extensions before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Solaris Trusted Extensions ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Solaris Trusted Extensions

In research: Solaris Trusted Extensions appears in astronomy research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Solaris Trusted Extensions in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Solaris Trusted Extensions is common in secondary-school and first-year university syllabi. It links to neighbouring topics Operating system security, Operating system stubs, Proprietary operating systems, so understanding it makes those chapters shorter.
In everyday life: Look for Solaris Trusted Extensions outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Solaris Trusted Extensions in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Solaris Trusted Extensions means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Solaris Trusted Extensions out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Solaris Trusted Extensions in simple terms?

Why does Solaris Trusted Extensions matter?

Because it connects several astronomy ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Solaris Trusted Extensions?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Solaris Trusted Extensions.