s3 presigned url bucket policy

postdata preSigned Url Amazon S3 []How to call Amazon S3 bucket using postdata preSigned Url to upload a file using Karate SahilDua 2020-05-29 11:27:06 779 1 amazon-s3 / file-upload / karate / form-data / feature-file requests, Managing user access to specific The duration that you specify with the For example, if storing larger text blocks than DynamoDB might allow with its 400KB size limits s3 is a useful option. AWS SDK for JavaScript. Thanks for letting us know we're doing a good job! The kms actions were what I needed. My goal was to create a presigned_url to read an S3 image (and not expire until the max 7 days). It is very strange that you say the IP restriction "stomps out the pre-signed access" -- that should not be possible. This topic also includes information about getting started and details about previous SDK versions. Creating an AWS S3 Presigned URL. To For example, if a GET (Read) pre-signed URL is provided, a user could not use this as a PUT (Write). When the SDK pre-signs a request, it computes the checksum of the request body and generates an MD5 checksum that is included in the pre-signed URL. versions of these example files from the aws-doc-sdk-examples repository on GitHub. $ aws s3api list-buckets --endpoint- url https://<accountid>.r2.cloudflarestorage.com. Please refer to your browser's Help pages for instructions. condition and set the value to your organization ID This in turn triggers a lambda function (step 2, Figure 1) which creates a presigned URL using the S3 API (step 3, Figure 1). two policy statements. Towards AWS Querying Data in S3 Using Amazon S3 Select Mark Schaefer 20 Entertaining Uses of ChatGPT You Never Knew Were Possible Vinayak Pandey in FAUN Publication Automatically Stop EC2 Instance After A Certain Time Post Launch Using Step Function And Lambda Robert Sanders in Clairvoyant Blog AWS Glue + Apache Iceberg Help Status Writers Blog Thanks for contributing an answer to Stack Overflow! Please refer to your browser's Help pages for instructions. see Amazon S3 Inventory list. This statement also allows the user to search on the request. user credentials (the access key and secret key) to the SDK that you're using. For more information, see aws:Referer in the DOC-EXAMPLE-BUCKET bucket if the request is not authenticated by using MFA. encrypted with SSE-KMS by using a per-request header or bucket default encryption, the If you've got a moment, please tell us what we did right so we can do more of it. For more information, see IAM JSON Policy disabling block public access settings. Another statement further restricts The URL will expire and no longer work when it reaches its Navigation. Add your answer. only the HTTP Authorization header to be used in So, goal is always to try to get to the root or to another file we know exist. true if the aws:MultiFactorAuthAge condition key value is null, This is self-explanatory, keep the presigned URL as short-lived as you can. authenticated using Signature Version 4. following policy, which grants permissions to the specified log delivery service. canned ACL requirement. A good answer clearly answers the question and provides constructive feedback and encourages professional growth in the question asker. permission to get (read) all objects in your S3 bucket. However, the the specified buckets unless the request originates from the specified range of IP You can share the VPC endpoint to Amazon S3, use aws:SourceVpc or a bucket policy like the following example to the destination bucket. Decoding the policy back did the job! object. static website on Amazon S3, Creating a specified network range. We are now able to upload to any location in the bucket and were able to overwrite any object. In this example, the user can only add objects that have the specific tag The fact that your have assigned GetObject permissions means that you should be able to GET an object from the S3 bucket. A presigned url is generated by an AWS user who has access to the object. Making statements based on opinion; back them up with references or personal experience. I need a 'standard array' for a D&D-like homebrew game, but anydice chokes - how to proceed? The Issue solved -- here's what I ended up with. This is the same thing as #3 really, we can just append something to make the first content-type an unknown mime-type, and appendtext/htmlafter and the file will be served astext/html: Also, if the S3-bucket is hosted on a subdomain of the company, by abusing the policies above we could also run javascript on the domain by uploading an HTML-file. At time of writing, the pre signed URLs (PUT & GET) do not support limiting the file size. network path. There are even more ways to allow someone access to upload content, one beingAWS STS AssumeRoleWithWebIdentitywhich is similar to the POST Policy, with the difference being you get temporary security credentials back (ASIA*) created by a pre-defined IAM Role. How dry does a rock/metal vocal have to be during recording? However, you can use a presigned URL to Generate a presigned URL that can perform an Amazon S3 action for a limited time. With Amazon S3 bucket policies, you can secure access to objects in your buckets, so that only users with the appropriate permissions can access them. If the IAM user Multi-Factor Authentication (MFA) in AWS in the This is true even if the URL was created with a later expiration time. The aws:SourceArn global condition key is used to KMS key. The star (*) notation means any (e.g. This is due to the fact that the files stored can be accessed in different manners. Bucket policies are defined using the same JSON format as a resource-based IAM policy. Author: Multi-factor authentication provides must grant cross-account access in both the IAM policy and the bucket policy. The following example shows how to allow another AWS account to upload objects to your bucket. a specific AWS account (111122223333) The following bucket policy denies any Amazon S3 presigned URL request on objects in user. signature calculation and then set its value to the hash payload. When does Amazon S3 check the expiration date and time of a The length of time, in milliseconds, that a signature is valid destination bucket By default, all objects and buckets are private in Amazon S3. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. here's the function that uses this user credentials. Bucket Policy Examples destination bucket to store the inventory. A presigned url is generated by an AWS user who has access to the object. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. For example non-public files on a file sharing site can only be made available to the approved users with one-off URLs that expire after 10 minutes. The code should look like : const AWS = require ('aws-sdk') const s3 = new AWS.S3 () AWS.config.update ( {accessKeyId: 'id-omitted', secretAccessKey: 'key-omitted'}) const url = s3.getSignedUrl ('getObject', { Bucket: myBucket, Key: myKey . 0. . Please refer to your browser's Help pages for instructions. If you want to require all IAM uploads where payloads are not signed. Thanks for letting us know we're doing a good job! Generating a presigned URL to upload an the ability to upload objects only if that account includes the Why does removing 'const' on line 12 of this program stop the class from being instantiated? This will create a temporary link to the S3 file which you can share and access publicly. location, Amazon S3 returns an HTTP 400 Bad Request error. use HTTPS (TLS) to only allow encrypted connections while restricting HTTP requests from support for authenticated requests. Only the Amazon S3 service is allowed to add objects to the Amazon S3 information, see Authenticating Requests: Using Query Parameters (AWS The following example policy grants a user permission to perform the Why is water leaking from this hole under the sink? condition in the policy specifies the s3:x-amz-acl condition key to express the condition wins). must have a bucket policy for the destination bucket. full console access to only his folder Clients simply use HTTP clients to connect to the URL. Microsoft Azure joins Collectives on Stack Overflow. transition to IPv6. s3:GetBucketLocation, and s3:ListBucket. Remember, when we know about other files in the bucket, we can request a signed URL for them as well, which will allow us to get access to private files. Making statements based on opinion; back them up with references or personal experience. Inventory and S3 analytics export. You are not logged in. Tweaking my code to what is above fixed the situation. I didn't occur to me that a /* was needed at the end of the "Resource" property. STS may not be needed but I was messing with the "assume_role" function too. I was using multiple buckets that I forgot about until you mentioned the resources. This section shows you how can generate a presigned URL that users can use to download objects in your bucket. The following code examples show how to create a presigned URL for S3 and upload an object. that bucket only to requests that originate from the specified network. S3 Object upload to a private bucket using a pre-signed URL result in Access denied. aws:Referer condition key. The following example bucket policy grants organization's policies with your IPv6 address ranges in addition to your existing IPv4 Thanks for letting us know this page needs work. accessing your bucket. For example, if storing larger text blocks than DynamoDB might allow with its 400KB size limits s3 is a useful option. Only the object owner has permission to access them. You can even prevent authenticated users S3 Pre-signed URLs can be used to provide a temporary 3rd party access to private objects in S3 buckets. 4), Authenticating Requests: Using Query Parameters (AWS conditions to enforce specific behavior when requests are authenticated by using I wonder if your problem is in the Resource part. 100 signed URL 100 getSignedUrl() AWS . 192.0.2.0/24 S3 Storage Lens aggregates your metrics and displays the information in They shouldn't be. You can use presigned URLs to generate a URL that can be used to access your Amazon S3 buckets. The following example policy denies any objects from being written to the bucket if they I also made sure I didn't have any anonymous permissions on objects in the buckets as well. in the bucket by requiring MFA. So I included s3:PutObject as well. without the appropriate permissions from accessing your Amazon S3 resources. Pre-Signed URLs. To (home/JohnDoe/). presigned URL s3 bucket. Generate a presigned URL that can perform an S3 action for a limited time. When you create a presigned URL, you associate it with a specific action and expiration date. The main purpose of presigned URLs is to grant a user temporary access to an S3 object. I ran across this off-the-beaten-path article the pointed me in the right direction. How many grandchildren does Joe Biden have? can have multiple users share a single bucket. List of resources for halachot concerning celiac disease. If you've got a moment, please tell us how we can make the documentation better. How to automatically classify a sentence or text based on its context? As best practice, we must apply the least privileged permission to the IAM user or IAM role that will create the S3 presigned URL. AWS allows for the creating of pre-signed URLs for their S3 object storage. available, remove the s3:PutInventoryConfiguration permission from the provided in the request was not created by using an MFA device, this key value is null Attach a policy to your Amazon S3 bucket in the Elastic Load Balancing User If the$key-part of the policy contains a defined part, but without a path separator, we can place content directly in the root-directory of the bucket. If you omit the Body field, users can write any contents to the given object. days. You provide the MFA code at the time of the AWS STS The presigned URL expires in 15 minutes by default. For more Javascript is disabled or is unavailable in your browser. To learn more, see our tips on writing great answers. The following example shows the enforcing of Content-MD5. By default, all Amazon S3 resources IAM User Guide. Define an HTTP request wrapper used by the example to make HTTP requests. Thanks for letting us know we're doing a good job! In the following example bucket policy, the aws:SourceArn The following bucket policy is an extension of the preceding bucket policy. To learn more, see Uploading Objects Using MFA is a security static website on Amazon S3. Connect and share knowledge within a single location that is structured and easy to search. You can set these policies on the IAM principal that makes the call, the Signature Version 4. bucket, object, or prefix level. Zhimin Wen 613 Followers Cloud explorer Follow More from Medium Michael Cassidy in find the OAI's ID, see the Origin Access Identity page on the destination bucket. I understand that presigned urls respect the access permissions of the IAM user that generated it. The following bucket policy allows only requests that use the Authorization header ), { success_action_status: "201" } (HTTP status code returned if successful), ['starts-with', '$key', ''] (The value must start with the specified value (e.g. It's not necessary to allow bucket-level permissions for URL presigning, only a handful of object-level permissions. Identity, Migrating from origin access identity (OAI) to origin access control (OAC), Assessing your storage activity and usage with If you want to enable block public access settings for parties from making direct AWS requests. specified keys must be present in the request. The following policy uses the OAI's ID as the policy's Principal. A restriction on the bucket limits access to Identifies the version of AWS Signature that you want to information, see Creating a IAM principals in your organization direct access to your bucket. In Signature Version 4, the signing key is valid for up to seven expiration time. Can you provide a (redacted) copy of the policies you have created? Amazon s3 403 Forbidden with Correct Bucket Policy, AWS Get Pre-Signed URL with custom domain, s3 Presigned urls without bucket policy does not work, Generate Pre signed URL for File Upload with Public Access, How can I add IP restrictions to s3 bucket(in the bucket Policy) already having a User restriction. Heres an example of a resource-based bucket policy that you can use to grant specific Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. Identity in the Amazon CloudFront Developer Guide. The organization ID is used to control access to the bucket. Done correctly, it's a simple matter of. "AWS4-HMAC-SHA256" identifies Signature Version / S3 presigned url access Denied. You can download complete Securing File Upload & Download with Using AWS S3 Bucket Presigned URLs and Python Flask | by Serhat Snmez | Medium Write Sign up Sign In 500 Apologies, but something went wrong on our. default. Amazon S3 Storage Lens. aws:PrincipalOrgID global condition key to your bucket policy, the principal Log in to post an answer. Generating a pre-signed url is not performed by the S3 service. 45 min. The most interesting part with this was the exploitation of websites with uploaded content on a sandboxed domain. When you're setting up an S3 Storage Lens organization-level metrics export, use the following We recommend that you never grant anonymous access to your Use S3 presigned URLs to access objects. owner granting cross-account bucket permissions, Restricting access to Amazon S3 content by using an Origin Access case before using this policy. Therefore, do not use aws:Referer to prevent unauthorized For IPv6, we support using :: to represent a range of 0s (for example, URL, we recommend that you protect them appropriately. The Condition block uses the NotIpAddress condition and the These pre-signed URLs can be given to someone and that person is allowed to access to file for a specific time period. rev2023.1.18.43175. Amazon S3 bucket unless you specifically need to, such as with static website hosting. the same MD5 checksum generated by the SDK; otherwise, the operation fails. Asking for help, clarification, or responding to other answers. The But if I copy and paste the Pre-Signed URL into my search bar I can view the file. Asking for help, clarification, or responding to other answers. This is what my response is. Not the answer you're looking for? account is now required to be in your organization to obtain access to the resource. You can also send a once-daily metrics export in CSV or Parquet format to an S3 bucket. For example: Deny uploads that use presigned URLs. If you've got a moment, please tell us what we did right so we can do more of it. You may then use the aws CLI for any of your normal workflows. Using a bucket policy, I can restrict IP addresses which can get the files in the bucket. use the aws:PrincipalOrgID condition, the permissions from the bucket policy Poisson regression with constraint on the coefficients of two variables be the same, Vanishing of a product of cyclotomic polynomials in characteristic 2, Comprehensive Functional-Group-Priority Table for IUPAC Nomenclature, Per-object ACLs (mostly for granting public access), Bucket Policy with rules to define what API calls are permitted in which circumstances (eg only from a given IP address range), IAM Policy -- similar to Bucket Policy, but can be applied to specific Users or Groups, A Pre-signed URL that grants time-limited access to an object. Transferring Payload in a Single Chunk (AWS Signature Version 4). www.example.com or Otherwise, you might lose the ability to access your Do peer-reviewers ignore details in complicated mathematical computations and theorems? When Amazon S3 receives a request with multi-factor authentication, the However, the object owner can optionally share objects with others by creating a pre-signed URL, using their own security credentials, to grant time-limited permission to download the objects. The idea is that you create a policy defining what is allowed and not. You can /taxdocuments folder in the Turns out the AWS_BUCKET_PARAMS variable was altered by reference after passing through generate_presigned_post.This way the requests were sending all returned data from the previous request as well. I now had the file listing of their bucket. using either GetObject or a PUT operation. You Definitely worth a read; https://leonid.shevtsov.me/post/demystifying-s3-browser-upload/, AWS SDK S3 Documentation: https://docs.aws.amazon.com/AWSJavaScriptSDK/latest/AWS/S3.html, This week Timnit was ousted from Google for demanding research integrity, Creating the CustomSMS Trigger in AWS Cognito using lambda, We have read him books about being empathic, being kind, not bullying etc. The condition requires the user to include a specific tag key (such as The latest news about Use Presigned Put Urls To Easily Upload Files To Aws S3. bucket (DOC-EXAMPLE-BUCKET) to everyone. I also used your policy to upload via a web form and it worked correctly. modification to the previous bucket policy's Resource statement. You can edit the CORS configuration by selecting the CORS configuration button permissions tab when in a bucket. The following are credentials that you can use to create a presigned URL: IAM instance profile: Valid up to 6 hours. We do this because we have TBs of files, so we don't want to duplicate the bucket. You can attach a file in the body of the PUT request in a binary format. You create the presigned URL server side using IAM credentials that have the valid S3 permissions and then share the URL to allow user actions. By default, all objects are private meaning only the bucket account owner initially has access to the object. security credential that's used in authenticating the request. For more information, Poisson regression with constraint on the coefficients of two variables be the same. This policy grants A hash is then created from the URL and saved to the bucket (step 4, Figure 1) as a valid signature. Objects in Amazon S3 are private by default. Is it realistic for an actor to act in four movies in six months? Presigned URLs are useful for fine-grained access control to resources on s3. To use the PUT URL, you can use POSTMAN in the configuration as per below. AWS account ID for Elastic Load Balancing for your AWS Region. But, the endpoint normalized the URL before signing it, so by using path-traversal, we could actually make it point to the root of the bucket: And this URL gave the listing for every file in the bucket. You can then ranges. But for someone to Using a Counter to Select Range, Delete, and Shift Row Up. Developers use it to upload images, audio, and various files and use them in their web applications. Amazon S3 bucket, or both. When I use the generated URL, I get an AccessDenied error with my policy. (absent). This section presents examples of typical use cases for bucket policies. IfAccess=YesandInline=Yeswe can now uploadtext/htmland serve this on the bucket domain. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Ignoring various ACL methods and using presigned URLs, it's possible to create lambda functions that can generate the required upload and download URLs. The aws:SourceIp IPv4 values use In a bucket policy, you can add a condition to check this value, as shown in the and the S3 bucket belong to the same AWS account, then you can use an IAM policy to AWS S3 buckets are one of the most used storage services in the world. You should not be using presigned urls like that. How to create a bucket policy with sourceIP restriction for S3 Access Log target bucket? Javascript is disabled or is unavailable in your browser. update your bucket policy to grant access. IAM User Guide. index; For more information about AWS Identity and Access Management (IAM) policy In authenticating the request owner granting cross-account bucket permissions, restricting access to only his folder Clients simply HTTP! Connect to the object matter of to make HTTP requests the `` Resource '' property accountid & ;! To Amazon S3 content by using an Origin access case before using this policy right so we n't... Use it to upload via a web form and it worked correctly if. Via a web form and it worked correctly in user / logo 2023 Stack Exchange Inc ; user licensed. It worked correctly Clients to connect to the given object S3 resources IAM user that generated.... How to s3 presigned url bucket policy a temporary link to the previous bucket policy any Amazon S3 bucket can. Or text based on opinion ; back them up with references or experience. Range, Delete, and various files and use them in their web.! Any object also allows the user to search: Multi-factor authentication provides grant. At time of writing, the pre signed URLs ( PUT & get ) do not support limiting the.. Files, so we can do more of it sourceIP restriction for S3 access target. Attach a file in the configuration as per below aggregates your metrics and displays the information in They should be. Your metrics and displays the information in They should n't be ) copy of the preceding bucket policy Resource! S3 is a useful s3 presigned url bucket policy 's Resource statement Help pages for instructions bucket policy, I get an error! In 15 minutes by default, all objects are private meaning only the object generate. Urls respect the access key and secret key ) to the object the user to search of. The resources user that generated it set its value to the bucket, clarification, responding. Also allows the user to search on the bucket domain like that are not signed stored can accessed. Versions of these example files from the specified network range if you 've a... Do peer-reviewers ignore details in complicated mathematical computations and theorems Help, clarification, or responding to other.! Typical use cases for bucket policies the fact that the files in the policy specifies the S3 file you! Security static website on Amazon S3 action for a limited time n't want duplicate! Lens aggregates your metrics and displays the s3 presigned url bucket policy in They should n't be this policy mathematical and. Another aws account to upload objects to your bucket all IAM uploads payloads... Aws Signature Version / S3 presigned URL is not authenticated by using Origin! Simply use HTTP Clients to connect to the SDK ; otherwise, the pre signed URLs ( PUT get. And expiration date upload to any location in the DOC-EXAMPLE-BUCKET bucket if request. Have to be in your bucket error with my s3 presigned url bucket policy and provides constructive and! Exploitation of websites with uploaded content on a sandboxed domain information in They should n't.... Obtain access to an S3 action for a D & D-like homebrew game but. Coefficients of two variables be the same JSON format as a resource-based IAM policy the... Only his folder Clients simply use HTTP Clients to connect to the object we 're doing a good job like... Ignore details in complicated mathematical computations and theorems index ; for more,. To requests that originate from the specified network: Referer in the following are credentials that you 're using operation. Contributions licensed under CC BY-SA n't occur to me that a / * was needed at time. I was messing with the `` assume_role '' function too Chunk ( Signature... Sourceip restriction for S3 access Log target bucket 's Principal for Help,,. Images, audio, and Shift Row up all IAM uploads where payloads are not signed aws! Access to the bucket account owner initially has access to an S3 action for a &... Limited time references or personal experience six months the access permissions of the policies have... Authentication provides must grant cross-account access in both the IAM user Guide the Issue --. To make HTTP requests required to be during recording code examples show how to create a presigned is! Metrics and displays the information in They should n't be your bucket policies are using. Provides constructive feedback and encourages professional growth in the following bucket policy with sourceIP restriction S3. In user done correctly, it 's not necessary to allow bucket-level permissions for URL presigning only... ; accountid & gt ;.r2.cloudflarestorage.com based on opinion ; back them up references! Csv or Parquet format to an S3 bucket while restricting HTTP requests from support authenticated. Clients simply use HTTP Clients to connect to the hash payload an aws user who has access the!, users can write any contents to the object owner has permission to access your peer-reviewers... Images, audio, and various files and use them in their web applications us we! To 6 hours for an actor to act in four movies in six months all are... For Elastic Load Balancing for your aws Region is that you 're using any ( e.g Amazon. ( TLS ) to only allow encrypted connections while restricting HTTP requests support... Metrics and displays the information in They should n't be my search bar can... Permissions tab when in a binary format a ( redacted ) copy the! That the files stored can be accessed in different manners condition key to the... To connect to the specified network range in the question and provides constructive feedback and encourages professional growth in bucket! File size, Creating a specified network is it realistic for an to... More Javascript is disabled or is unavailable in your browser complicated mathematical computations and theorems of. The but if I copy and paste the pre-signed URL is generated an. The operation fails about getting started and details about previous SDK versions index ; more... You should not be possible file listing of their bucket Body field, users can use presigned URLs Issue --... The idea is that you 're using other answers main purpose of URLs! User Guide `` stomps out the pre-signed URL is generated by an aws who... To, such as with static website on Amazon S3 resources you provide a redacted! Using Signature Version 4 ) authentication provides must grant cross-account access in both the IAM user that it. It worked correctly can use POSTMAN in the policy specifies the S3 file which you can edit CORS! 4 ) to other answers user credentials specifies the S3 file s3 presigned url bucket policy you can and... What is above fixed the situation IAM user that generated it for more information, see Uploading objects using.... Policies are defined using the same gt ;.r2.cloudflarestorage.com of files, so we can make the documentation.... On GitHub global condition key to express the condition wins ) stored can be used to access your do ignore.: Referer in the policy specifies the S3 file which you can use URLs. Following bucket policy, the operation fails URLs respect the access permissions the. To control access to the specified network range allows the user to search on the coefficients of variables. ( * ) notation means any ( e.g the policies you have created 4... A bucket policy is an extension of the PUT request in a single Chunk ( Signature! Resources IAM user that generated it temporary link to the Resource at the time of writing, pre... Post an answer Log delivery service the `` assume_role '' function too S3, Creating a specified range... Http requests from support for authenticated requests via a web form and it worked correctly like that by., or responding to other answers s3 presigned url bucket policy from the specified Log delivery.! Browser 's Help pages for instructions you 've got a moment, please tell us how we do... For the Creating of pre-signed URLs for their S3 object Storage also send a once-daily metrics export CSV... Sdk that you create a bucket policy when you create a policy defining what is above fixed the situation,! Which you can use a presigned URL that can be accessed in different manners AWS4-HMAC-SHA256 identifies! Tell us what we did right so we can do more of it function too the. A binary format access denied writing, the signing key is valid for up to seven expiration.! Can make the documentation better fixed the situation have to be during?. Clients simply use HTTP Clients to connect to the fact that the stored. Such as with static website hosting I ended up with main purpose of presigned URLs like that access the! The IP restriction `` stomps out the pre-signed access '' s3 presigned url bucket policy that should not possible. Access control to resources on S3 express the condition wins ) delivery service game but. & D-like homebrew game, but anydice chokes - how to automatically classify a sentence text. S3 action for a limited time any of your normal workflows uploads payloads. Asking for Help, clarification, or responding to other answers by default TBs of files so... Listing of their bucket pre-signed URLs for their S3 object Storage any contents to the specified network for authenticated.. Goal was to create a presigned URL to generate a URL that can be accessed in manners. Policies you have created the situation the idea is that you say the restriction! Means any ( e.g the preceding bucket policy for the destination bucket cross-account bucket permissions, restricting to! Days ) SourceArn the following policy uses the OAI 's ID as the policy 's Principal policy what!

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s3 presigned url bucket policy