This is an original planning guide. It is not a vendor manual, an official standard, or legal advice. Example addresses use documentation ranges. Review every command before you paste it.
What this hour is for
Preventing Public S3 Buckets explains a policy or a setting you paste. A public ACL, a public principal, or a block that is off is a finding, not a configuration you keep. A pre-signed URL is not a reason to leave the bucket public.
Write the account, project, or repository you administer, the name of this change, and the time. A second change waits until this line has been read back.
The browser tool drafts text or reads a paste you already hold. It does not log in, it does not scan, and it does not apply.
192.0.2.10/24, gateway 192.0.2.1, 198.51.100.0/24, 203.0.113.0/24, and 2001:db8::/32 are documentation. example.com is a documentation name. A sample password is replaced.
The change you can finish
Apply nothing while you are writing the note. When the lab window opens, it is one change on the account named in the ticket. Read the draft, then the account, then decide.
Rollback is the previous file, the previous plan, or the lab resource you can delete because it was only a lab.
- Write the bucket you administer.
- Read the exposure note.
- Write the one finding.
- Do not turn the block off.
- Do not apply a public policy.
- Stop.
Mistakes that outlive the statement
Preventing Public S3 Buckets goes wrong in a small set of ways. The list is here so the ticket can forbid them before the window.
- Block Public Access turned off.
- A public ACL applied to test the tool.
- A live pre-signed URL filed as the fix.
- A bucket you do not administer.
Decisions to write down
One decision for Preventing Public S3 Buckets: The bucket is yours. Public access stays blocked. The finding is a finding. Nothing public is applied. And one bucket is the window.
Checks before you call it done
Confirm this before you call the change done: The bucket is written. The block is still on. Nothing public was applied. No live URL is in the note. And a second person can say the finding. If one of those fails, stop.
# Public-bucket reading.
# Leave Block Public Access on.
# Do not apply a public policy.
Before you leave the account
Preventing Public S3 Buckets ends when the account in the note is the account in the ticket. If it is not, stop.
The draft stays a draft until a person has read the names in it. A generator does not log in, does not apply, and does not scan.
192.0.2.10/24, gateway 192.0.2.1, 198.51.100.0/24, 203.0.113.0/24, and 2001:db8::/32 are documentation. example.com is a documentation name. A sample password is replaced. It is not a password you keep. 10.0.0.0/16 is a sample prefix, not a network you publish unless you already use it.
prompt-for-this is a reminder that a secret is missing. It is not an access key, a token, or a password you save. An Azure secret draft may contain a sample password. Replace it. Do not file it.
One change is the window. If two things move and the result is wrong, you will not know which one did it.
If the same step fails twice, stop for the day. Restore the copy you took first.
A second person reads the account and the change aloud. If they cannot find them in the ticket, the note is not done.
This page is a planning guide. It is not a vendor manual, not an official standard, not legal advice, and not an audit opinion. You do not apply it against an account you do not administer.
Tools for this guide
These tools run in the browser on this site. They do not log into your machines.
Related pillar guides
More in this cluster
The pillar for this page, and the next published pages filed with it.