SignatureDoesNotMatch api auth_error ai_generated partial

403 Forbidden: The request signature we calculated does not match the signature you provided. Check your key and signing method.

ID: api/invalid-signed-url-expiration

Also available as: JSON · Markdown · 中文
82%Fix Rate
88%Confidence
1Evidence
2024-03-12First Seen

Version Compatibility

VersionStatusIntroducedDeprecatedNotes
AWS S3 SDK v1.12.0 active — — —
Google Cloud Storage XML API v1 active — — —
Azure Blob Storage REST API 2021-12-02 active — — —

Root Cause

Signed URL expiration or key mismatch due to clock skew or incorrect signing algorithm.

generic

中文

签名URL过期或密钥不匹配，因时钟偏差或签名算法错误导致。

Official Documentation

https://docs.aws.amazon.com/AmazonS3/latest/API/sigv4-query-string-auth.html

Workarounds

  1. 85% success Synchronize system clocks using NTP (e.g., run 'ntpdate pool.ntp.org' or enable NTP service) and regenerate the signed URL within the expiration window. 
    Synchronize system clocks using NTP (e.g., run 'ntpdate pool.ntp.org' or enable NTP service) and regenerate the signed URL within the expiration window.
  2. 80% success If using AWS S3 signed URLs, verify the signing region and service: ensure 'X-Amz-Algorithm' is 'AWS4-HMAC-SHA256' and the credential scope matches the bucket region. Example: aws s3 presign s3://mybucket/file --expires-in 3600 --region us-east-1 
    If using AWS S3 signed URLs, verify the signing region and service: ensure 'X-Amz-Algorithm' is 'AWS4-HMAC-SHA256' and the credential scope matches the bucket region. Example: aws s3 presign s3://mybucket/file --expires-in 3600 --region us-east-1
  3. 75% success Implement retry logic with clock drift compensation: subtract 30 seconds from current time when generating the signature to account for minor skew. 
    Implement retry logic with clock drift compensation: subtract 30 seconds from current time when generating the signature to account for minor skew.

中文步骤

  1. Synchronize system clocks using NTP (e.g., run 'ntpdate pool.ntp.org' or enable NTP service) and regenerate the signed URL within the expiration window.
  2. If using AWS S3 signed URLs, verify the signing region and service: ensure 'X-Amz-Algorithm' is 'AWS4-HMAC-SHA256' and the credential scope matches the bucket region. Example: aws s3 presign s3://mybucket/file --expires-in 3600 --region us-east-1
  3. Implement retry logic with clock drift compensation: subtract 30 seconds from current time when generating the signature to account for minor skew.

Dead Ends

Common approaches that don't work:

  1. 65% fail

    Regenerating the same URL with same parameters but ignoring clock skew between servers (e.g., more than 5 minutes drift) will still fail.

  2. 55% fail

    Switching to a different signing algorithm (e.g., from HMAC-SHA256 to HMAC-SHA1) without updating both client and server causes mismatch.

  3. 75% fail

    Copying the signed URL to a different environment (e.g., from staging to production) where the secret key differs will always fail.