SignatureDoesNotMatch on PutObject - handles GetObject

#php editor Strawberry will introduce to you how to deal with the "SignatureDoesNotMatch on PutObject - Processing GetObject" problem in this article. When performing object upload and retrieval operations, you sometimes encounter this error prompt, which may be caused by a mismatch in the requested signature. This article will explain the cause of this problem in detail and provide solutions to help you handle this error smoothly and ensure that your object upload and retrieval operations can proceed normally.

Question content

I'm trying to create a signed url for a putobject in s3. The method I use to do this for getobject works fine, so my credentials are valid.

I have turned off all public access blocks so it should be public.

Bucket Policy:

{
    "version": "2012-10-17",
    "statement": [
        {
            "sid": "allowputobject",
            "effect": "allow",
            "principal": "*",
            "action": "s3:putobject",
            "resource": "arn:aws:s3:::adobe-sign-test/*"
        }
    ]
}

Bucket cors:

[
    {
        "allowedheaders": [
            "*"
        ],
        "allowedmethods": [
            "get",
            "head",
            "put"
        ],
        "allowedorigins": [
            "*"
        ],
        "exposeheaders": []
    }
]

I have tried using the s3 library, now using s3manager in this case. However, when I try to place the object using a signed url, I get an xml error telling me signaturedoesnotmatch.

The following is the code for a valid get and a failed put.

func getpresignedurl(bucket, key, operation string, expiresin int64, region string, s3accesskeyid string, s3secretaccesskey string) string {
    sess := session.must(session.newsession(&aws.config{
        region: aws.string(region),
        credentials: credentials.newstaticcredentials(
            s3accesskeyid,
            s3secretaccesskey,
            "",
        ),
    }))

    uploader := s3manager.newuploader(sess)

    if operation == "putobject" {
        // generate a pre-signed url for a putobject operation
        uploadurl, _ := uploader.upload(&s3manager.uploadinput{
            bucket: aws.string(bucket),
            key:    aws.string(key),
            acl:    aws.string("bucket-owner-full-control"),
        })

        return uploadurl.location
    }

    // generate a pre-signed url for a getobject operation
    req, _ := uploader.s3.getobjectrequest(&s3.getobjectinput{
        bucket: aws.string(bucket),
        key:    aws.string(key),
    })

    geturl, err := req.presign(time.duration(expiresin) * time.second)
    if err != nil {
        fmt.println(err)
        return ""
    }

    return geturl
}

Here's how I try to put the file using curl: curl -x put -t some-file.jpg "https://adobe-sign-test.s3.eu-north-1.amazonaws.com/hejsan.jpg?x-amz-algorithm=aws4-hmac -sha256&x- amz-credential=akiaqjglaaktl3qqfz73/20230706/eu-north-1/s3/aws4_request&x-amz-date=20230706t074846z&x-amz-expires=3600&x-amz-signedheaders=host&x-amz-signature=5eb429ee8efc 1 c8ffcae64d77a588119cfde81512bc5c4516a1120b20e26cac7"

This is the error message for the put operation:

<?xml version="1.0" encoding="UTF-8"?>
<Error><Code>SignatureDoesNotMatch</Code><Message>The request signature we calculated does not match the signature you provided. Check your key and signing method.</Message><AWSAccessKeyId>AKIAQJGLAAKTL3QQFZ73</AWSAccessKeyId><StringToSign>AWS4-HMAC-SHA256
20230706T074846Z
20230706/eu-north-1/s3/aws4_request
7666f6675cc3fe3a3aa20f98928aeccd4b9bc851666fcf03fb425d5819d7e72d</StringToSign><SignatureProvided>5eb429ee8efc1c8ffcae64d77a588119cfde81512bc5c4516a1120b20e26cac7</SignatureProvided><StringToSignBytes>41 57 53 34 2d 48 4d 41 43 2d 53 48 41 32 35 36 0a 32 30 32 33 30 37 30 36 54 30 37 34 38 34 36 5a 0a 32 30 32 33 30 37 30 36 2f 65 75 2d 6e 6f 72 74 68 2d 31 2f 73 33 2f 61 77 73 34 5f 72 65 71 75 65 73 74 0a 37 36 36 36 66 36 36 37 35 63 63 33 66 65 33 61 33 61 61 32 30 66 39 38 39 32 38 61 65 63 63 64 34 62 39 62 63 38 35 31 36 36 36 66 63 66 30 33 66 62 34 32 35 64 35 38 31 39 64 37 65 37 32 64</StringToSignBytes><CanonicalRequest>PUT
/hejsan.jpg
X-Amz-Algorithm=AWS4-HMAC-SHA256&amp;X-Amz-Credential=AKIAQJGLAAKTL3QQFZ73%2F20230706%2Feu-north-1%2Fs3%2Faws4_request&amp;X-Amz-Date=20230706T074846Z&amp;X-Amz-Expires=3600&amp;X-Amz-SignedHeaders=host
host:adobe-sign-test.s3.eu-north-1.amazonaws.com

host
UNSIGNED-PAYLOAD</CanonicalRequest><CanonicalRequestBytes>50 55 54 0a 2f 68 65 6a 73 61 6e 2e 6a 70 67 0a 58 2d 41 6d 7a 2d 41 6c 67 6f 72 69 74 68 6d 3d 41 57 53 34 2d 48 4d 41 43 2d 53 48 41 32 35 36 26 58 2d 41 6d 7a 2d 43 72 65 64 65 6e 74 69 61 6c 3d 41 4b 49 41 51 4a 47 4c 41 41 4b 54 4c 33 51 51 46 5a 37 33 25 32 46 32 30 32 33 30 37 30 36 25 32 46 65 75 2d 6e 6f 72 74 68 2d 31 25 32 46 73 33 25 32 46 61 77 73 34 5f 72 65 71 75 65 73 74 26 58 2d 41 6d 7a 2d 44 61 74 65 3d 32 30 32 33 30 37 30 36 54 30 37 34 38 34 36 5a 26 58 2d 41 6d 7a 2d 45 78 70 69 72 65 73 3d 33 36 30 30 26 58 2d 41 6d 7a 2d 53 69 67 6e 65 64 48 65 61 64 65 72 73 3d 68 6f 73 74 0a 68 6f 73 74 3a 61 64 6f 62 65 2d 73 69 67 6e 2d 74 65 73 74 2e 73 33 2e 65 75 2d 6e 6f 72 74 68 2d 31 2e 61 6d 61 7a 6f 6e 61 77 73 2e 63 6f 6d 0a 0a 68 6f 73 74 0a 55 4e 53 49 47 4e 45 44 2d 50 41 59 4c 4f 41 44</CanonicalRequestBytes><RequestId>SMFDTR996NQE9DDV</RequestId><HostId>VehdLPGdnoVZclkNKs2+lTjFpAssA1Xe+HZSj5ZCCVK2QnumQHqzsePFg3TWWaai3+vqGgnwxpjMd3b8526I7Q==</HostId></Error>

Workaround

There is a example go in the aws SDK code base with get and put and a pre-signed url for s3 that might help. You can clone the repository and run the examples yourself by following the instructions in the readme file. The example has methods and then a console application demonstrating how to run them.

// GetObject makes a presigned request that can be used to get an object from a bucket.
// The presigned request is valid for the specified number of seconds.
func (presigner Presigner) GetObject(
    bucketName string, objectKey string, lifetimeSecs int64) (*v4.PresignedHTTPRequest, error) {
    request, err := presigner.PresignClient.PresignGetObject(context.TODO(), &s3.GetObjectInput{
        Bucket: aws.String(bucketName),
        Key:    aws.String(objectKey),
    }, func(opts *s3.PresignOptions) {
        opts.Expires = time.Duration(lifetimeSecs * int64(time.Second))
    })
    if err != nil {
        log.Printf("Couldn't get a presigned request to get %v:%v. Here's why: %v\n",
            bucketName, objectKey, err)
    }
    return request, err
}



// PutObject makes a presigned request that can be used to put an object in a bucket.
// The presigned request is valid for the specified number of seconds.
func (presigner Presigner) PutObject(
    bucketName string, objectKey string, lifetimeSecs int64) (*v4.PresignedHTTPRequest, error) {
    request, err := presigner.PresignClient.PresignPutObject(context.TODO(), &s3.PutObjectInput{
        Bucket: aws.String(bucketName),
        Key:    aws.String(objectKey),
    }, func(opts *s3.PresignOptions) {
        opts.Expires = time.Duration(lifetimeSecs * int64(time.Second))
    })
    if err != nil {
        log.Printf("Couldn't get a presigned request to put %v:%v. Here's why: %v\n",
            bucketName, objectKey, err)
    }
    return request, err
}



// DeleteObject makes a presigned request that can be used to delete an object from a bucket.
func (presigner Presigner) DeleteObject(bucketName string, objectKey string) (*v4.PresignedHTTPRequest, error) {
    request, err := presigner.PresignClient.PresignDeleteObject(context.TODO(), &s3.DeleteObjectInput{
        Bucket: aws.String(bucketName),
        Key:    aws.String(objectKey),
    })
    if err != nil {
        log.Printf("Couldn't get a presigned request to delete object %v. Here's why: %v\n", objectKey, err)
    }
    return request, err
}

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