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How to restrict object access to only certain origins through CORS policy in Spaces?

Posted September 23, 2017 5.6k views
Object Storage

This isn’t necessarily specific to DigitalOcean, as I am experiencing the same thing with S3.

First, here is the request that I am sending successfully from Node.js AWS SDK:

s3.putBucketCors({
  Bucket: EXAMPLE_BUCKET,
  CORSConfiguration: {
    CORSRules: [
      { 
        AllowedHeaders: [`*`],
        AllowedMethods: [`GET`],
        AllowedOrigins: [`https://example.com`]
      }
    ]
  }
}, (err, data) => {
  if (err) throw err
  console.log(data)
})

I have verified that this indeed works as a call to getBucketCors returns expected configuration.

From the above policy, I would expect to not be able to access objects in EXAMPLE_BUCKET from localhost, or anywhere that isn’t example.com, however, that isn’t the case. I am able to GET objects in this bucket from localhost, as well as http://dev.example.com.

What am I not understanding?

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By:
lokua
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6 answers
apaterno October 2, 2017

Hi did you fix it ? Im in the same situation I’m trying to set the following CORS xml:

<CORSConfiguration>
<CORSRule>
<AllowedOrigin></AllowedOrigin>
<AllowedMethod>GET</AllowedMethod>
<AllowedHeader></AllowedHeader>
</CORSRule>
</CORSConfiguration>

Using:

s3cmd setcors s3cors.xml s3://myfiles

But I’m getting:
WARNING: Retrying failed request: /?cors (500 (UnknownError))
WARNING: Retrying failed request: /?cors (500 (UnknownError))

Sent a ticket to DigitalOcean Support 5 hours ago .... still no answer ....

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varunvarde2007 October 5, 2017

Did you get any resolution for this from the DO Team?

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leonardk1 September 30, 2017

As For Digital Ocean,
I believe the expected XML generated is not right
since Digital Ocean expects something like this

<CORSConfiguration>
 <CORSRule>
  .....

according to the api docs, however with boto it seems to generate using

CORSConfiguration: {
    CORSRules: [

Note the difference between CORSRules(boto) and CORSRule(DO API)

I have been working on this also for an entire day

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lokua November 5, 2017

Posting this for reference as it pertains to the original use case that prompted the question:

https://stackoverflow.com/questions/46516183/s3-cors-configuration-restricting-to-specific-domains-has-no-affect

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johngannon December 8, 2017

Hey all - we just released a UI for CORS in the Control Panel. Hopefully this helps a bit.

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danpoynor June 10, 2019

I’m trying to prevent other websites from hotlinking images/videos hosted in my DigitalOcean Spaces account.

If other websites are able to show images/videos which I’m paying hosting for it defeats the purpose of using Spaces I think.

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