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Bug 1482903

Summary:	[DOCS] vague behavior of a "corsAllowedOrigins" parameter in a "master-config.yaml" configuration file
Product:	OpenShift Container Platform	Reporter:	Alexander Zagaynov <azagayno>
Component:	Documentation	Assignee:	Ashley Hardin <ahardin>
Status:	CLOSED CURRENTRELEASE	QA Contact:	Johnny Liu <jialiu>
Severity:	medium	Docs Contact:	Vikram Goyal <vigoyal>
Priority:	high
Version:	3.4.0	CC:	aos-bugs, dcaldwel, jialiu, jliggitt, jokerman, mmccomas
Target Milestone:	---
Target Release:	---
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:	3.10-release-plan
Fixed In Version:		Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:
Clones:	1512708 (view as bug list)		Environment:
Last Closed:	2018-04-11 21:15:49 UTC	Type:	Bug
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:
Bug Blocks:	1512708

Description Alexander Zagaynov 2017-08-18 11:13:53 UTC

Description of problem:

"corsAllowedOrigins" parameter in a "master-config.yaml" configuration file behavior is either not documented well or leads to a possible security leak.
It is possible to set it to "something" and both "something" and "something.hostile.com" in an "Origin:" HTTP header will be matched as valid.
It is also possible to set it to "127.0.0.1" and "127a0b0c1" will be matched as valid.

Version-Release number of selected component (if applicable):

- not applicable

How reproducible:

- see description above

Steps to Reproduce:

- see description above

Actual results:

- see description above

Expected results:

- see description above

Additional info:

https://github.com/openshift/origin/blob/master/vendor/github.com/emicklei/go-restful/cors_filter.go#L195
https://github.com/openshift/origin/blob/master/vendor/github.com/emicklei/go-restful/cors_filter.go#L145
https://github.com/kubernetes/apiserver/blob/master/pkg/server/filters/cors.go#L91
https://github.com/kubernetes/apiserver/blob/master/pkg/server/filters/cors.go#L46
https://golang.org/pkg/regexp/#Compile

Comment 1 Jordan Liggitt 2017-08-19 01:12:38 UTC

Correct. It is a regular expression, fully under the control of the config field (i.e. no pinning or escaping is done to the value)

We can update documentation to make that clearer

Comment 2 Alexander Zagaynov 2017-08-30 11:55:31 UTC

I've added a PR to `openshift-ansible` repo about that: https://github.com/openshift/openshift-ansible/pull/5264

Comment 4 Jordan Liggitt 2018-04-06 20:29:18 UTC

added comment in issue

Comment 5 Johnny Liu 2018-04-09 11:12:31 UTC

LGTM.

Comment 6 Ashley Hardin 2018-04-11 21:15:49 UTC

Content is now published:
https://access.redhat.com/documentation/en-us/openshift_container_platform/3.9/html/architecture/infrastructure-components#architecture-infrastructure-components-web-console