feat: Allow wildcard domains for redirect_to checks #1528

abador · 2021-07-12T10:05:40Z

Related issue

resolves #943
@aeneasr

Proposed changes

Allow to whitelist a wildcard domain. Domains are filtered out using golang.org/x/net/publicsuffix

Checklist

I have read the contributing guidelines.
I am following the
contributing code guidelines.
I have read the security policy.
I confirm that this pull request does not address a security
vulnerability. If this pull request addresses a security. vulnerability, I
confirm that I got green light (please contact
[email protected]) from the maintainers to push
the changes.
I have added tests that prove my fix is effective or that my feature
works.
I have added or changed the documentation.

Further comments

aeneasr

Awesome, thank you for your contribution! This looks pretty good and I have some ideas how to improve it further :)

aeneasr · 2021-07-12T12:01:21Z

driver/config/config.go

+			continue
+		}
+		eTLD, icann := publicsuffix.PublicSuffix(parsed.Host)
+		if parsed.Host[:1] == "*" &&


This panics if host is an empty string. Also, what about foo.*.bar?

Most of the cases I can think of is adding some return domain eg: page1.foo.bar or page2.foo.bar where those changes are valid. If we want to make more complicated situations work I would probably go with regex, but is this case really needed?

aeneasr · 2021-07-12T12:02:50Z

x/http_secure_redirect.go

@@ -55,6 +55,14 @@ func SecureRedirectOverrideDefaultReturnTo(defaultReturnTo *url.URL) SecureRedir
 	}
 }

+// SecureRedirectToIsWhitelisted validates if the redirect_to param is allowed for a given wildcard
+func SecureRedirectToIsWhiteListedHost(returnTo *url.URL, allowed url.URL) bool {


Could you please add tests for this?

ttimonen · 2021-07-14T22:56:26Z

x/http_secure_redirect.go

+// SecureRedirectToIsWhitelisted validates if the redirect_to param is allowed for a given wildcard
+func SecureRedirectToIsWhiteListedHost(returnTo *url.URL, allowed url.URL) bool {
+	if allowed.Host != "" && allowed.Host[:1] == "*" {
+		return strings.HasSuffix(returnTo.Host, allowed.Host[1:])


What's the plan for case sensitivity here?

On documentation, the function docstring is ambiguous,

when wildcards are used, the match is case-sensitive,

when wildcards are not used, the match is case-insensitive.

To follow the principle of least surprise, you might want to do one of

Do strings.HasSuffix(strings.ToLower(returnTo.Host), strings.ToLower(allowed.Host[1:]) here to be case-insensitive.

.. or do return allowed.Host == returnTo.Host few lines later to be case-sensitive.

.. or mention this semi-case-insensitivity behavior in the function comment if it is intentional and preferred.

Hostnames are case insensitive, so the correct approach would be to have the wildcard matches also case insensitive :)

aeneasr · 2021-07-30T08:50:01Z

While the PR is being worked on I will mark it as a draft. That declutters our review backlog :)

Once you're done with your changes and would like someone to review them, mark the PR as ready and request a review from one of the maintainers.

Thank you!

aeneasr · 2021-10-12T05:51:38Z

@abador are you still up for the changes or should I close this?

abador · 2021-10-14T09:14:11Z

@abador are you still up for the changes or should I close this?
Sorry @aeneasr I'll get back to all upstream tickets on friday or next week

…t domain

…rect-to-domains # Conflicts: # driver/config/config.go # go.mod

abador · 2021-10-22T06:23:14Z

@aeneasr it seems that e2e tests are failing, but it doesn't look it's connected to my changes. If we really need a solution that works with wildcards inside a subdomain please ping me

aeneasr · 2021-10-27T12:17:23Z

I tried pushing some changes required for merging the PR to your fork & branch, but it appears that I am not allowed to do so 😕

% git push ...
ERROR: Permission to push denied to aeneasr.
fatal: could not read from the remote repository.

Please make sure that you have the correct access rights
and the repository exists.

But the good news is, giving access is easy! ☺️ All you need to do is enable write access for maintainers. Thank you! 😄

If the repository belongs to an organization, please add me for the project as a collaborator!

aeneasr

Great! Now, one last thing :) We need to document it! Could you please add some docs here: https://www.ory.sh/kratos/docs/concepts/browser-redirect-flow-completion

Thank you! 🙏

abador · 2021-11-08T08:06:38Z

Great! Now, one last thing :) We need to document it! Could you please add some docs here: https://www.ory.sh/kratos/docs/concepts/browser-redirect-flow-completion

Thank you! 🙏

I've added some more docs in my last commit.

aeneasr · 2021-11-09T08:17:41Z

Great stuff!

Updated example for `allowed_return_urls` to include wildcard url. [Merged PR from 2021](ory#1528)

…3533) See #1528

feat:Allow wildcard domains for redirect_to checks

67d79ef

abador mentioned this pull request Jul 12, 2021

Allow wildcard redirect to domains Wikia/kratos#4

Closed

6 tasks

aeneasr requested changes Jul 12, 2021

View reviewed changes

aeneasr modified the milestones: v0.8.0-alpha.1, v0.9.0-alpha.1 Jul 12, 2021

ttimonen reviewed Jul 14, 2021

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aeneasr marked this pull request as draft July 30, 2021 08:50

aeneasr modified the milestones: v0.9.0-alpha.1, v0.10.0-alpha.1, Incubating Release Aug 17, 2021

Check if host is set and case-insensitive verification of the redirec…

b5351c3

…t domain

abador changed the title ~~feat:Allow wildcard domains for redirect_to checks~~ feat: Allow wildcard domains for redirect_to checks Oct 21, 2021

abador added 4 commits October 21, 2021 10:31

Add SecureRedirectToIsWhiteListedHost tests

67481b6

Merge remote-tracking branch 'origin/master' into allow-wildcard-redi…

3d25bcc

…rect-to-domains # Conflicts: # driver/config/config.go # go.mod

Add go mod for publicsuffix

e826cc5

fix tests

add81f0

abador marked this pull request as ready for review October 22, 2021 06:23

abador requested a review from zepatrik as a code owner October 22, 2021 06:23

abador added 2 commits October 25, 2021 12:35

Merge branch 'master' into allow-wildcard-redirect-to-domains

8021987

Merge branch 'master' into allow-wildcard-redirect-to-domains

0d6e69b

abador added 3 commits October 28, 2021 10:00

Merge branch 'master' into allow-wildcard-redirect-to-domains

31f60f5

Merge branch 'master' into allow-wildcard-redirect-to-domains

b0931b8

Merge branch 'master' into allow-wildcard-redirect-to-domains

17e9bcc

Merge branch 'master' into allow-wildcard-redirect-to-domains

40c3702

aeneasr requested changes Nov 1, 2021

View reviewed changes

abador added 3 commits November 2, 2021 08:05

Merge branch 'master' into allow-wildcard-redirect-to-domains

008f704

Merge branch 'master' into allow-wildcard-redirect-to-domains

3b8a606

Add info in documentation

5ff7ee5

aeneasr approved these changes Nov 9, 2021

View reviewed changes

aeneasr merged commit 349cdcf into ory:master Nov 9, 2021

martinloesethjensen added a commit to martinloesethjensen/kratos that referenced this pull request Sep 26, 2023

Update config.schema.json

0f44938

Updated example for `allowed_return_urls` to include wildcard url. [Merged PR from 2021](ory#1528)

martinloesethjensen mentioned this pull request Sep 26, 2023

docs: update allowed_return_urls examples in config.schema.json to include wildcard #3533

Merged

7 tasks

aeneasr pushed a commit that referenced this pull request Oct 2, 2023

docs: add example for allowed_return_urls to include wildcard url (#…

39b0c3c

…3533) See #1528

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feat: Allow wildcard domains for redirect_to checks #1528

feat: Allow wildcard domains for redirect_to checks #1528

abador commented Jul 12, 2021 •

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feat: Allow wildcard domains for redirect_to checks #1528

feat: Allow wildcard domains for redirect_to checks #1528

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abador commented Jul 12, 2021 • edited by zepatrik Loading

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