Stop using commonName to validate certificates. #238
Conversation
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
|
@swift-nio-bot test this please |
PeterAdams-A
approved these changes
Sep 30, 2020
| /// name fields. For this reason, we currently allow an override for trusting the common name. This | ||
| /// is a temporary measure to allow users to work around these limitations, but we will remove this | ||
| /// functionality in future. | ||
| public var trustCommonName: Bool |
There was a problem hiding this comment.
Should we (assuming it's possible) mark the setter for this as deprecated right from the start?
Davidde94
approved these changes
Sep 30, 2020
Motivation: CommonName as part of certificate hostname verification has been deprecated for more than two decades. Browsers have finally stopped using the commonName as part of verification, and the WebPKI forbids putting names into the commonName that are not also part of the subjectAlternativeName extension. Continuing to trust the commonName as part of the certificate hostname will put us in a weaker position than most of the browser ecosystem. That's not a good place to be, so we should flip our default to not trusting the commonName any longer. For pragmatic reasons, we do allow an override, but the default configuration is off. Users using this override will likely find themselves disappointed when we remove it at some point in the future. Modifications: - Added TLSConfiguration options to enable trusting commonName fields for hostname verification. - Made investigating the commonName field optional during hostname verification. - Tests to validate the new behaviour. Result: No trusting common names by default anymore.
Lukasa
force-pushed
the
cb-remove-common-name
branch
from
b027bb4 to
fc028b4
Compare
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
Add this suggestion to a batch that can be applied as a single commit.
This suggestion is invalid because no changes were made to the code.
Suggestions cannot be applied while the pull request is closed.
Suggestions cannot be applied while viewing a subset of changes.
Only one suggestion per line can be applied in a batch.
Add this suggestion to a batch that can be applied as a single commit.
Applying suggestions on deleted lines is not supported.
You must change the existing code in this line in order to create a valid suggestion.
Outdated suggestions cannot be applied.
This suggestion has been applied or marked resolved.
Suggestions cannot be applied from pending reviews.
Suggestions cannot be applied on multi-line comments.
Suggestions cannot be applied while the pull request is queued to merge.
Suggestion cannot be applied right now. Please check back later.
Motivation:
CommonName as part of certificate hostname verification has been
deprecated for more than two decades. Browsers have finally stopped
using the commonName as part of verification, and the WebPKI forbids
putting names into the commonName that are not also part of the
subjectAlternativeName extension.
Continuing to trust the commonName as part of the certificate hostname
will put us in a weaker position than most of the browser ecosystem.
That's not a good place to be, so we should flip our default to not
trusting the commonName any longer.
For pragmatic reasons, we do allow an override, but the default
configuration is off. Users using this override will likely find
themselves disappointed when we remove it at some point in the future.
Modifications:
for hostname verification.
verification.
Result:
No trusting common names by default anymore.