Course / 07 Security / Lesson 08 of 08

The rule for every tool from here on

Estimated time: 14 min reading · 14 min activity

Before using a tool, compare the action you intend to take with the permission you actually have. A grant names a target, a permitted action and a time, along with exclusions and a stop. Installing a program only makes its features available on your device; it does not extend anyone's permission to test another service.

A reachable host, a private address or a link from a permitted page does not expand the grant. Even a service you use may be operated by someone else. When the boundary is unclear, pause the proposed action and obtain a clear decision from the responsible owner. The required exercise stays on fictional printed evidence.

Before you begin

Estimated time
14 min reading, 14 min activity. Setup and optional practice may take longer.
Where you work
Read the fictional cards in any current desktop or mobile browser. No installation, account, password tool, directory deployment or network request is required. Use only the evidence supplied on this page.
Without a lab
The page prints the evidence needed for the activity. Write your classifications and reasons in notes, then compare them with the activity rubric. This practices reasoning; it does not reproduce a live incident or tool operation. Reading works without JavaScript. Answer checking requires JavaScript and a secure browser context; saving progress also requires usable browser storage.

After this lesson you can:

  • Accept or reject a proposed tool action from a printed grant.
  • Write the target, action, and time before any command.
  • Classify harm, permission, representation, and the directory role in one ungraded case.

01Example

The fictional grant below concerns a local note page. Identify the action it permits and the targets it excludes before reading the new activity grant.

Target: http://127.0.0.1:8000/note
Allowed: read that owned page
Excluded: the fictional print server, any scan, any other host
A tool that could name the fictional print server is still outside this grant.
The page does not need to be started for this card.

02Possession is not permission

Write the target, action, time, exclusions and stop before considering the tool. Match each proposal against all of them. A permitted read does not include a scan, and one named page does not include every linked host. A later live exercise would also need a real owned target and setup instructions.

The worked loopback URL is a model of a local address: 127.0.0.1 refers to the same machine. The port 8000 identifies a service there, and /note identifies its path. No service is started here. This card teaches how to read a grant, rather than making a legal judgment about a real test.

Apply a named grant to a proposed tool action, and close the security-decision case.Model. A teaching model drawn by hand. It shows the idea, not real tool output.

Read the full explanation below.

Read owned noteName the print server
Named target

Target: http://127.0.0.1:8000/note

met · Exact owned loopback note.
Allowed action

Allowed: read that owned page

met · Read only.
Explicit exclusions

Excluded: the fictional print server, any scan, any other host

met · No scan or other target.
Apply the stated rule
Matches grant

The paper card allows reading the owned note; it does not require starting the page.

A tool's capability does not widen its grant; these choices issue no requests.

The paper card allows reading the owned note; it does not require starting the page.

Follow the explanation

  1. The paper card allows reading the owned note; it does not require starting the page.
  2. Having a tool does not grant its possible actions.
Read every state and value

1. The paper card allows reading the owned note; it does not require starting the page.

Case
read
Conditions inspected
Named target · Allowed action · Explicit exclusions
Decision shown
Yes

2. Having a tool does not grant its possible actions.

Case
print
Conditions inspected
Named target · Allowed action · Explicit exclusions
Decision shown
Yes
A tool's capability does not widen its grant; these choices issue no requests.

03Mark two proposals

Proposal A reads the printed card. Proposal B names the fictional print server. Decide each one from the activity grant.

Original fictional grants. No tool was installed or run for this lesson.
A tool runs the action it is given. Owning the tool is not a grant.

Worked grant
Target: http://127.0.0.1:8000/note
Allowed action: read that owned page
Time: not part of this lesson
Excluded: the fictional print server, any scan, any other host
The loopback page was not started here. The fictional print server is excluded even if a tool could name it.

Activity grant
Target: owned-notes
Allowed action: read the printed card
Time: during this lesson
Excluded: scanning, any other host, the fictional print server
Stop: uncertain permission, private data, or a target other than owned-notes

Proposal A: read the printed owned-notes card during this lesson.
Proposal B: scan the fictional print server with a tool installed on the laptop.

Check: proposal A matches the grant. Proposal B is outside the grant.
Write the target, the action, and the time for proposal A.

Download the tool-scope checklist

  1. Copy the activity grant, including the stop.
  2. Mark proposal A and proposal B against the target and the action.
  3. Check: proposal A matches the grant. Proposal B is outside the grant. Write target, action, and time for A.
  4. Stop. Do not install a tool and do not send either proposal.

04Ideas case

Use the fictional case below to connect the goals, identity checks, operations and scope decisions from this module. Write a reason for each decision before comparing with its rubric. This is a self-review activity; the understanding question remains separate.

Original fictional case for the Ideas module. Ungraded. It is a self-review activity.
No tool was run and no directory was built.

Facts
Count: a stored count changes from 4 to 40. The edit log is empty.
Account: rina is signed in. The server denies rina's read of noor's private note.
Bag: the note is shown as standard Base64, with no key.
Envelope: a different copy is marked encryption, and the key is not on the card.
Grant: read owned-notes during this lesson. Excluded: scanning and any other host.
Proposal: scan a different public host.
Directory line: dc-1 holds the club directory.
Name line: notes.lab.invalid A 192.0.2.44.

Rubric. Write one line each from these facts.
1. The count change directly harms integrity. Reading would be confidentiality. A service that fails to load would be availability.
2. Sign-in succeeded. The deny is authorization, and the server makes it.
3. The Base64 bag is encoding. The envelope is encryption. Neither card is a hash.
4. The public-host scan is outside the grant. Stop before any command.
5. dc-1 is the domain controller. The A record is a DNS record, not the directory.

Closing note
These cards are the required path. A live tool, a real password check, and a real directory remain deferred.
This stage does not train an Active Directory attack and does not authorize a target.

Download the security-decision case

  1. Name the direct harm of the count change, and the check that denied rina.
  2. Name the Base64 bag and the envelope as different operations, and name dc-1 apart from the A record.
  3. Decide whether the proposed public-host scan matches the grant. For each classification, cite the case fact that supports it.
  4. Stop. The case is not a live test. A later comparison belongs inside a new grant.

05Optional challenge

Allow about ten minutes. A proposed test is allowed “in the afternoon” but has no end time or time zone. Draft a clarification naming the start, end and time zone, and keep the proposed action paused until those limits are settled.

06Fresh cases for the checks

Use these fictional cases for the checks below. They have different inputs from the worked examples. Read them here or make notes; no installation or external service is needed.

Tool case A: independent complete grantOwned fixture. An original file made for this course. Follow the activity's instructions in your own lab.

Owner: course lab owner.
Target: supplied willow-record card.
Allowed action: read and annotate the printed card.
Window: 15:00–16:00 UTC, same fictional day.
Excluded: changing files, scans, external services.
Stop: private data appears or permission becomes uncertain.
Proposal P: annotate the card at 15:20.
Proposal Q: scan an external service at 15:20.
Proposal R: change the card file at 15:20.

Tool case B: independent synthesis factsOwned fixture. An original file made for this course. Follow the activity's instructions in your own lab.

Count changes from 8 to 80 without an authorized edit.
Bag uses declared standard Base64 with no key.
Server dc-willow holds the account directory; a separate A record maps a hostname to an IPv4 address.
A tool is installed locally but its target is not named in any testing grant.

07Explain your prediction

Optional written self-check: Write permission before commands: target, action, time, exclusions and stop. Tie each security concept to a supplied fact and keep tool ownership separate from permission to use it on a system.

08Common mistakes

If you allowed proposal B because a tool is installed, you treated possession as a grant. The activity grant excludes the fictional print server.

If you called the A record the domain controller, you reused the DNS object from the directory card. The case names dc-1.

If you called the Base64 bag encryption, you skipped the missing key. The envelope is the encryption line.

References

Next is the first lesson of Tools.