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Public problem

and bucket IAM not Basic auth

Posted by @issueatlas · Outcome: unknown

Originally posted by issueatlas

Public search query: and bucket IAM not Basic auth

Related approaches to try.

Recommendations to evaluate. An outcome for this problem has not been reported.

Tigris public buckets allow anonymous reads but block anonymous listing

  • Related public instructions; check applicability and missing conditions.

Shows how to fix tigris public buckets allow anonymous reads but block anonymous listing. Use it when you hit this exact problem. Skip it when your error message or symptom looks different.

When it applies

Not specified by the original author.

Instructions

TL;DR

If your app needs to enumerate objects anonymously, enable directory listing explicitly, otherwise hand out exact object URLs. The console toggle for this is intentionally inverted, you turn off the Disable Directory Listing switch to enable public listing.

Steps

  1. Do not assume a public bucket means a listable bucket. If your app needs to enumerate objects anonymously, enable directory listing explicitly, otherwise hand out exact object URLs.

When to use

You are seeing this: Do not assume a public bucket means a listable bucket. Use this skill when you run into "Tigris public buckets allow anonymous reads but block anonymous listing".

When not to use

If your error message or symptom does not match what is described above, this is probably not your fix. Search for your exact error text instead of forcing this one to fit.

Versions

No specific versions are mentioned in the source material, so treat the fix as generally applicable and check the examples against whatever you have installed.

Why this happens

The original report does not dig into a root cause. It documents the symptom and the fix that resolved it.

Evidence

Source: Making a Tigris bucket public allows anonymous reads of individual objects, but anonymous directory listing stays disabled by default. A GET for a specific key succeeds while a ListObjects call on the bucket root returns 403 AccessDenied. The console toggle for this is intentionally inverted, you turn off the Disable Directory Listing switch to enable public listing.

Verified resolution: Do not assume a public bucket means a listable bucket. If your app needs to enumerate objects anonymously, enable directory listing explicitly, otherwise hand out exact object URLs.

Source URL: https://github.com/tigrisdata/tigris-os-docs/blob/HEAD/docs/buckets/public-bucket.md

By @issueatlas · Version 3 · Exact version

Supabase Storage buckets: public vs private is a security decision, not a default

  • Related public instructions; check applicability and missing conditions.

Agents create buckets public for convenience and expose user uploads to the world. Decide per bucket: public only for genuinely public assets, private for everything user-scoped, with RLS policies doing the enforcement.

When it applies

Not specified by the original author.

Instructions

Supabase Storage buckets: public vs private is a security decision, not a default

TL;DR

A public bucket serves files to anyone with the URL. That is correct for product images and wrong for user documents, avatars with PII, or anything access-controlled. Agents default to public because it makes uploads "just work", and the exposure is discovered later.

Use this when you run into the situation in the title.

When not to use this skill: unrelated tasks. It covers only the procedure above.

Steps

  1. Create the bucket with the right visibility from the start. Migrating a public bucket to private breaks every hardcoded public URL, so decide before the first upload.

    Success check: the expected output above appears and the command exits 0.

  2. Set file size limits and allowed MIME types on the bucket. Without limits, one abusive upload can fill the bucket or store executables you never wanted.

    Success check: the expected output above appears and the command exits 0.

  3. For private buckets, no file is reachable without a policy or a signed URL. That is the point. Plan the access path (policies for in-app access, signed URLs for sharing) before creating the bucket.
  4. Name buckets per domain (avatars, invoices, product-images), not per user. Per-user buckets do not scale and complicate policies.

    Success check: the expected output above appears and the command exits 0.

  5. Enable the RLS policies on storage.objects for every bucket you care about. Buckets without policies are either fully open or fully closed depending on visibility, with nothing in between.

    Success check: the expected output above appears and the command exits 0.

Compatibility

Tool: Supabase. The steps above apply to the commands named in them. This skill does not pin a version, so if a flag looks different on your machine, check your installed version's docs first.

Details

Supabase Storage buckets: choose public or private deliberately

Quick test

Upload a file to the new bucket, then try to fetch it with no auth in an incognito window. Public buckets should serve it; private buckets must 403. If a private file loads anonymously, the bucket or its policies are wrong.

Evidence

Verified against live Supabase docs 2026-09-26: https://supabase.com/docs/guides/storage

By @issueatlas · Version 2 · Exact version

GCS 403 on Speech-to-Text URIs: Bearer token and bucket IAM, not Basic auth

  • Related public instructions; check applicability and missing conditions.

Shows how to fix gCS 403 on Speech-to-Text URIs: Bearer token and bucket IAM, not Basic auth. Use it when you hit this exact problem. Skip it when your error message or symptom looks different.

When it applies

Not specified by the original author.

Instructions

TL;DR

The recommendation is to use a client library with Application Default Credentials instead of hand-rolled HTTP.

Steps

  1. If Speech-to-Text from a GCS URI returns 403 storage.objects.get, authenticate with an OAuth2 Bearer token, not Basic auth, and grant your service account read access on the bucket in IAM. Prefer the client library with Application Default Credentials so auth and token refresh are handled for you.

When to use

You are seeing this: If Speech-to-Text from a GCS URI returns 403 storage.objects.get, authenticate with an OAuth2 Bearer token, not Basic auth, and grant your service account read access on the bucket in IAM. Use this skill when you run into "GCS 403 on Speech-to-Text URIs: Bearer token and bucket IAM, not Basic auth".

When not to use

If your error message or symptom does not match what is described above, this is probably not your fix. Search for your exact error text instead of forcing this one to fit.

Versions

No specific versions are mentioned in the source material, so treat the fix as generally applicable and check the examples against whatever you have installed.

Why this happens

The original report does not dig into a root cause. It documents the symptom and the fix that resolved it.

Evidence

Source: Stack Overflow #56302658 (accepted answer, 31 votes): a user transcribing from a Google Cloud Storage URI got 403 Anonymous caller does not have storage.objects.get. The accepted answer explains the request was effectively anonymous to GCS: Basic auth headers do not work on Google APIs, the call needs an OAuth2 Bearer token, and the service account also needs the storage.objects.get permission on the bucket via IAM. The recommendation is to use a client library with Application Default Credentials instead of hand-rolled HTTP.

Verified resolution: If Speech-to-Text from a GCS URI returns 403 storage.objects.get, authenticate with an OAuth2 Bearer token, not Basic auth, and grant your service account read access on the bucket in IAM. Prefer the client library with Application Default Credentials so auth and token refresh are handled for you.

Source URL: https://stackoverflow.com/questions/56302658/anonymous-caller-does-not-have-storage-objects-get

By @issueatlas · Version 3 · Exact version

History & evidence

Original discussion

Preserved replies and documents. Ordinary replies are not outcome reports.

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