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Signing an S3 URL with a future expiration AND start date

Creating signed S3 and Cloudfront URLs via the AWS SDKBucket policy that respects pre-signed URLs OR IP Address deny?Sketch JS, how to use AWS pre-signed URL on audio tag?AWS JS SDK: getSignedUrl and expiration times with clock skewAmazon AWS S3 - Allow Pre-signed Expired URL to workHow to Access Object From Amazon s3 using getSignedUrl OperationAccess-control-allow-origin on aws javascript sdk getSignedUrl operation?S3 upload from browser with presigned URL and SSE-C - 307 and 403sGenerate Pre signed URL for File Upload with Public AccessWhy is my presigned URL for an Amazon S3 bucket expiring before the expiration time that I specified?

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0

We can sign a URL for S3 using the JS SDK, and set an expiration date:

const params = Bucket: 'bucket', Key: 'key', Expires: 60;
const url = s3.getSignedUrl('getObject', params);
console.log('The URL is', url); // expires in 60 seconds

Can we also set a date for when the signed request would be valid?

Suppose I want to sign a URL in a way where it won't be valid until tomorrow, and then will be valid for one day. How would I do that? Preferably, with the JS SDK.

amazon-s3 aws-sdk-js

share|improve this question

asked Mar 25 at 1:25

BradBrad

119k29244406

add a comment | 

0

We can sign a URL for S3 using the JS SDK, and set an expiration date:

const params = Bucket: 'bucket', Key: 'key', Expires: 60;
const url = s3.getSignedUrl('getObject', params);
console.log('The URL is', url); // expires in 60 seconds

Can we also set a date for when the signed request would be valid?

Suppose I want to sign a URL in a way where it won't be valid until tomorrow, and then will be valid for one day. How would I do that? Preferably, with the JS SDK.

amazon-s3 aws-sdk-js

share|improve this question

asked Mar 25 at 1:25

BradBrad

119k29244406

add a comment | 

We can sign a URL for S3 using the JS SDK, and set an expiration date:

const params = Bucket: 'bucket', Key: 'key', Expires: 60;
const url = s3.getSignedUrl('getObject', params);
console.log('The URL is', url); // expires in 60 seconds

Can we also set a date for when the signed request would be valid?

Suppose I want to sign a URL in a way where it won't be valid until tomorrow, and then will be valid for one day. How would I do that? Preferably, with the JS SDK.

amazon-s3 aws-sdk-js

share|improve this question

asked Mar 25 at 1:25

BradBrad

119k29244406

const params = Bucket: 'bucket', Key: 'key', Expires: 60;
const url = s3.getSignedUrl('getObject', params);
console.log('The URL is', url); // expires in 60 seconds

share|improve this question

asked Mar 25 at 1:25

BradBrad

119k29244406

share|improve this question

asked Mar 25 at 1:25

BradBrad

119k29244406

asked Mar 25 at 1:25

BradBrad

119k29244406

asked Mar 25 at 1:25

BradBrad

119k29244406

1 Answer
1

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oldest

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1

S3's pre-signed URLs do not offer this functionality, directly.

CloudFront does support this, if you use a CloudFront signed URL with a custom policy instead.

You can create a CloudFront distribution, and connect it to the bucket with an Origin Access Identity, which allows CloudFront to authenticate itself for accessing the bucket, and then "Restrict viewer access" on the CloudFront distribution so that CloudFront only allows access when a valid signed CloudFront URL is provided. CloudFront signed URLs require a "not after" date, but also support a "not before" date.

You'll need to use CloudFront.Signer.getSignedUrl() but do not supply the url or expires options. Pass only the policy option.

The policy is a JSON string containing values for Resource, DateLessThan (expiration time) and DateGreaterThan (before which, access the URL will be denied). You can optionally pass IpAddress to limit use of this URL to a single IPv4 address or block. IPv6-based restriction isn't supported.

It's a bit of an advanced operation, but see these example policy statements for the expected format. The whitespace shown in the examples does not need to be included in the policy document.

You don't need to follow the instructions for actually signing and escaping the URL because the SDK is handling that part for you... but you'll need to create the JSON policy.

share|improve this answer

answered Mar 26 at 0:57

Michael - sqlbotMichael - sqlbot

100k14150215

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Thanks for the information. One quick follow-up question... I stumbled on X-Amz-Date (docs.aws.amazon.com/AmazonECR/latest/APIReference/…) since posting the question. Can it be used for this purpose?
  
  – Brad
  Mar 26 at 0:59
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  It crossed my mind that manipulating X-Amz-Date might be an option, but it is not as simple as just manipulating that. The X-Amz-Credential would also need to be modified, which would change the signature, and this likely gets deeper into the actual signing logic than the SDK may allow you to easily access. I'm not certain what the granularity would be, if you took this approach. If I were guessing, the signed URL would likely start working either ~15 minutes or ~7 days prior to X-Amz-Date, based on what's actually happening internally with credential rotation and timestamp checking.
  
  – Michael - sqlbot
  Mar 26 at 1:07
  

  
  
  
  

add a comment | 

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1

S3's pre-signed URLs do not offer this functionality, directly.

CloudFront does support this, if you use a CloudFront signed URL with a custom policy instead.

You can create a CloudFront distribution, and connect it to the bucket with an Origin Access Identity, which allows CloudFront to authenticate itself for accessing the bucket, and then "Restrict viewer access" on the CloudFront distribution so that CloudFront only allows access when a valid signed CloudFront URL is provided. CloudFront signed URLs require a "not after" date, but also support a "not before" date.

You'll need to use CloudFront.Signer.getSignedUrl() but do not supply the url or expires options. Pass only the policy option.

The policy is a JSON string containing values for Resource, DateLessThan (expiration time) and DateGreaterThan (before which, access the URL will be denied). You can optionally pass IpAddress to limit use of this URL to a single IPv4 address or block. IPv6-based restriction isn't supported.

It's a bit of an advanced operation, but see these example policy statements for the expected format. The whitespace shown in the examples does not need to be included in the policy document.

You don't need to follow the instructions for actually signing and escaping the URL because the SDK is handling that part for you... but you'll need to create the JSON policy.

share|improve this answer

answered Mar 26 at 0:57

Michael - sqlbotMichael - sqlbot

100k14150215

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Thanks for the information. One quick follow-up question... I stumbled on X-Amz-Date (docs.aws.amazon.com/AmazonECR/latest/APIReference/…) since posting the question. Can it be used for this purpose?
  
  – Brad
  Mar 26 at 0:59
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  It crossed my mind that manipulating X-Amz-Date might be an option, but it is not as simple as just manipulating that. The X-Amz-Credential would also need to be modified, which would change the signature, and this likely gets deeper into the actual signing logic than the SDK may allow you to easily access. I'm not certain what the granularity would be, if you took this approach. If I were guessing, the signed URL would likely start working either ~15 minutes or ~7 days prior to X-Amz-Date, based on what's actually happening internally with credential rotation and timestamp checking.
  
  – Michael - sqlbot
  Mar 26 at 1:07
  

  
  
  
  

add a comment | 

1

S3's pre-signed URLs do not offer this functionality, directly.

CloudFront does support this, if you use a CloudFront signed URL with a custom policy instead.

You can create a CloudFront distribution, and connect it to the bucket with an Origin Access Identity, which allows CloudFront to authenticate itself for accessing the bucket, and then "Restrict viewer access" on the CloudFront distribution so that CloudFront only allows access when a valid signed CloudFront URL is provided. CloudFront signed URLs require a "not after" date, but also support a "not before" date.

You'll need to use CloudFront.Signer.getSignedUrl() but do not supply the url or expires options. Pass only the policy option.

The policy is a JSON string containing values for Resource, DateLessThan (expiration time) and DateGreaterThan (before which, access the URL will be denied). You can optionally pass IpAddress to limit use of this URL to a single IPv4 address or block. IPv6-based restriction isn't supported.

It's a bit of an advanced operation, but see these example policy statements for the expected format. The whitespace shown in the examples does not need to be included in the policy document.

You don't need to follow the instructions for actually signing and escaping the URL because the SDK is handling that part for you... but you'll need to create the JSON policy.

share|improve this answer

answered Mar 26 at 0:57

Michael - sqlbotMichael - sqlbot

100k14150215

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Thanks for the information. One quick follow-up question... I stumbled on X-Amz-Date (docs.aws.amazon.com/AmazonECR/latest/APIReference/…) since posting the question. Can it be used for this purpose?
  
  – Brad
  Mar 26 at 0:59
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  It crossed my mind that manipulating X-Amz-Date might be an option, but it is not as simple as just manipulating that. The X-Amz-Credential would also need to be modified, which would change the signature, and this likely gets deeper into the actual signing logic than the SDK may allow you to easily access. I'm not certain what the granularity would be, if you took this approach. If I were guessing, the signed URL would likely start working either ~15 minutes or ~7 days prior to X-Amz-Date, based on what's actually happening internally with credential rotation and timestamp checking.
  
  – Michael - sqlbot
  Mar 26 at 1:07
  

  
  
  
  

add a comment | 

S3's pre-signed URLs do not offer this functionality, directly.

CloudFront does support this, if you use a CloudFront signed URL with a custom policy instead.

You can create a CloudFront distribution, and connect it to the bucket with an Origin Access Identity, which allows CloudFront to authenticate itself for accessing the bucket, and then "Restrict viewer access" on the CloudFront distribution so that CloudFront only allows access when a valid signed CloudFront URL is provided. CloudFront signed URLs require a "not after" date, but also support a "not before" date.

You'll need to use CloudFront.Signer.getSignedUrl() but do not supply the url or expires options. Pass only the policy option.

The policy is a JSON string containing values for Resource, DateLessThan (expiration time) and DateGreaterThan (before which, access the URL will be denied). You can optionally pass IpAddress to limit use of this URL to a single IPv4 address or block. IPv6-based restriction isn't supported.

It's a bit of an advanced operation, but see these example policy statements for the expected format. The whitespace shown in the examples does not need to be included in the policy document.

You don't need to follow the instructions for actually signing and escaping the URL because the SDK is handling that part for you... but you'll need to create the JSON policy.

share|improve this answer

answered Mar 26 at 0:57

Michael - sqlbotMichael - sqlbot

100k14150215

share|improve this answer

answered Mar 26 at 0:57

Michael - sqlbotMichael - sqlbot

100k14150215

answered Mar 26 at 0:57

Michael - sqlbotMichael - sqlbot

100k14150215

answered Mar 26 at 0:57

Michael - sqlbotMichael - sqlbot

100k14150215