ConfigGenerator

S3 Bucket Policy Generator

Generate AWS S3 bucket policy JSON with principals, actions, conditions, HTTPS enforcement, KMS encryption, read/write rules, and public access warnings.

Output:A ready-to-use configuration file for S3 Bucket Policy with best practices applied.

Security Rules

bucket-policy.json
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Quick Summary

Use an S3 Bucket Policy Generator when you need bucket policy JSON for principals, actions, conditions, HTTPS enforcement, KMS encryption, read access, or write access.

What is this tool?

An S3 Bucket Policy Generator creates the JSON document required to manage resource-based permissions on an AWS S3 Bucket. It simplifies defining complex rules, such as enforcing HTTPS only, requiring specific KMS keys, or explicitly denying public access.

Best Practices

  • Always pin versions and specific ARNs where possible.
  • Validate your configuration locally or via dry-run before pushing to production.
  • Never hardcode secrets; use AWS Secrets Manager or Parameter Store.
  • Implement least privilege access control.

Common Mistakes

  • Syntax typos causing immediate deployment failures.
  • Leaving trailing commas in JSON configurations.
  • Embedding plaintext secrets directly in files.
  • Opening overly broad 0.0.0.0/0 ports or wildcard permissions.

Frequently Asked Questions

What is an S3 Bucket Policy Generator?
It is an interactive builder that produces a valid S3 bucket policy JSON for defining access rules across your entire bucket.
How do I create an S3 bucket policy?
Determine the required actions (e.g., `s3:GetObject`), select the principal (e.g., an IAM role or CloudFront OAI), specify the bucket ARN, and generate the JSON.
What is an S3 bucket policy JSON example?
A standard policy contains an `Effect` (Allow), a `Principal` (AWS account), an `Action` (Get/Put), and a `Resource` mapping to the `arn:aws:s3:::bucket-name/*`.
How do I enforce HTTPS in S3 bucket policy?
You create a statement with `Effect: Deny`, `Action: s3:*`, and a `Condition: { Bool: { aws:SecureTransport: false } }`.
How do I allow only a specific IAM role?
Set the `Principal` in the bucket policy directly to the ARN of the specific IAM role.
How do I create S3 bucket policy using AWS CLI?
Save the generated JSON and run `aws s3api put-bucket-policy --bucket my-bucket --policy file://policy.json`.
How do I make an S3 bucket public safely?
You must first disable the S3 Block Public Access settings, then apply a read-only bucket policy allowing `s3:GetObject` to `Principal: "*"`.
What is S3 bucket policy vs IAM policy?
An S3 bucket policy is attached directly to the bucket (resource-based), whereas an IAM policy is attached to a user/role (identity-based).

How We Keep Your Configs Safe & Valid

Built-in Error Checking

Every file is checked against official rules. We catch missing fields and bad syntax. YAML indentation errors are flagged right away. Kubernetes, Terraform, and Docker specs are all covered. API versions and labels are verified too. You get valid output every time you generate.

100% Private & Local

All tools run in your browser only. Your API keys never leave your machine. We do not use any tracking scripts. No data is sent to any server. Passwords and secrets stay on your device. Crypto operations use the Web Crypto API. Your privacy is fully protected at all times.

Secure Settings by Default

Configs use safe defaults out of the box. Containers run as non-root users. Root filesystems are set to read-only. Dangerous Linux capabilities are dropped. Network policies limit pod-to-pod traffic. TLS 1.3 is enabled for web servers. Security headers are added where needed.

Ready for CI/CD & Git

Output files are ready for your Git repo. Use them with ArgoCD, Flux, or GitHub Actions. Files use clear formatting and comments. Code review is easy for your team. Indentation and key order are consistent. Test in staging before going to production. Every file is clean and well-structured.

Infrastructure as Code

Store configs in Git alongside your code. Terraform modules include typed variables. Backend configs support remote state locking. Outputs work across multiple modules. Ansible playbooks use clear task steps. Chef and Puppet configs are also supported. Every file works with version control tools.

Monitoring & Tracing

Set up Prometheus with auto-discovery rules. Create Grafana dashboards with template variables. Add alerting rules with severity labels. Use OpenTelemetry for trace collection. Forward logs to Loki or Elasticsearch. Connect to Jaeger or Tempo for tracing. Monitor metrics, logs, and traces together.

Container & Docker Safety

Dockerfiles use multi-stage builds for small images. Base images are pinned to exact versions. Dev files are excluded from final images. Health checks are added for orchestrator use. Containers switch to non-root users. Docker Compose uses named volumes and networks. Resource limits are set in deploy configs.

Multiple Output Formats

Export as YAML, JSON, HCL, or TOML. Kubernetes uses YAML with proper separators. Terraform uses HCL with correct escaping. JSON output has consistent indentation. Copy to clipboard with one click. Preview output with syntax highlighting. Line numbers help you review quickly.