Tigris Security Access Control

Tigris Security & Access Control

Configure access keys, CORS rules, bucket visibility, and presigned URL security for Tigris object storage. Covers key lifecycle management, role-based access, and security auditing.

Prerequisites

Before doing anything else, install the Tigris CLI if it's not already available:

tigris help || npm install -g @tigrisdata/cli

If you need to install it, tell the user: "I'm installing the Tigris CLI (@tigrisdata/cli) so we can work with Tigris object storage."

Quick Reference

| Operation | Command | |-----------|---------| | Create key | tigris access-keys create "my-key" | | List keys | tigris access-keys list | | Assign to bucket | tigris access-keys assign --bucket --role Editor | | Revoke key | tigris access-keys delete | | Set CORS | tigris buckets cors set --config cors.json | | Get CORS | tigris buckets cors get | | Remove CORS | tigris buckets cors delete |

---

Access Key Lifecycle

Create

tigris access-keys create "production-app-key"
# Output:
# Access Key ID: tid_xxx
# Secret Access Key: tsec_yyy  ← shown ONLY once, save immediately

Assign to Bucket

# Editor: read + write + delete
tigris access-keys assign tid_xxx --bucket my-app-uploads --role Editor

# ReadOnly: read only
tigris access-keys assign tid_xxx --bucket my-app-uploads --role ReadOnly

| Role | Read | Write | Delete | Use When | |------|------|-------|--------|----------| | Editor | Yes | Yes | Yes | App servers that upload/modify files | | ReadOnly | Yes | No | No | Services that only read/serve files |

Scope Keys Narrowly

Create separate keys for different concerns:

# Key for the app server (read/write to uploads bucket)
tigris access-keys create "app-server"
tigris access-keys assign tid_app --bucket app-uploads --role Editor

# Key for the CDN/read service (read-only)
tigris access-keys create "cdn-reader"
tigris access-keys assign tid_cdn --bucket app-uploads --role ReadOnly

# Key for backups (write to backup bucket only)
tigris access-keys create "backup-writer"
tigris access-keys assign tid_bak --bucket app-backups --role Editor

Rotate Keys (Zero Downtime)

# 1. Create new key
tigris access-keys create "production-app-key-v2"
tigris access-keys assign tid_new --bucket my-app-uploads --role Editor

# 2. Update application environment with new key
# (deploy with new TIGRIS_STORAGE_ACCESS_KEY_ID / SECRET)

# 3. Verify app works with new key

# 4. Revoke old key
tigris access-keys delete tid_old

List and Audit

# List all access keys
tigris access-keys list

# Check which buckets a key can access
tigris access-keys info tid_xxx

---

CORS Configuration

CORS is required for browser-based uploads (direct uploads, presigned PUT URLs).

Set CORS Rules

tigris buckets cors set my-app-uploads --config cors.json

Development (Localhost)

{
  "CORSRules": [
    {
      "AllowedOrigins": ["http://localhost:3000", "http://localhost:5173"],
      "AllowedMethods": ["GET", "PUT", "POST", "DELETE", "HEAD"],
      "AllowedHeaders": ["*"],
      "ExposeHeaders": ["ETag", "Content-Length"],
      "MaxAgeSeconds": 3600
    }
  ]
}

Production (Specific Domain)

{
  "CORSRules": [
    {
      "AllowedOrigins": ["https://myapp.com", "https://www.myapp.com"],
      "AllowedMethods": ["GET", "PUT", "HEAD"],
      "AllowedHeaders": ["Content-Type", "Content-MD5", "Content-Disposition"],
      "ExposeHeaders": ["ETag"],
      "MaxAgeSeconds": 86400
    }
  ]
}

Combined Dev + Production

{
  "CORSRules": [
    {
      "AllowedOrigins": [
        "https://myapp.com",
        "https://www.myapp.com",
        "http://localhost:3000"
      ],
      "AllowedMethods": ["GET", "PUT", "POST", "DELETE", "HEAD"],
      "AllowedHeaders": ["*"],
      "ExposeHeaders": ["ETag", "Content-Length"],
      "MaxAgeSeconds": 3600
    }
  ]
}

Permissive (Any Origin)

{
  "CORSRules": [
    {
      "AllowedOrigins": ["*"],
      "AllowedMethods": ["GET"],
      "AllowedHeaders": ["*"],
      "MaxAgeSeconds": 86400
    }
  ]
}

Warning: Only use "*" origins for truly public, read-only content. Never allow PUT/DELETE from any origin.

Verify CORS

# Check current CORS config
tigris buckets cors get my-app-uploads

# Test with curl
curl -I -H "Origin: https://myapp.com" \
  -H "Access-Control-Request-Method: PUT" \
  -X OPTIONS \
  https://my-app-uploads.t3.storage.dev/test

---

Public vs Private Buckets

| Setting | Who Can Read | URL Access | Use For | |---------|-------------|------------|---------| | Private (default) | Only authenticated requests | Presigned URLs | User documents, sensitive files | | Public | Anyone with URL | Direct URL | Static assets, public images, CDN content |

# Create public bucket
tigris buckets create my-public-assets --public

# Create private bucket (default)
tigris buckets create my-private-docs

---

Presigned URL Security

Best Practices

| Parameter | Recommendation | |-----------|---------------| | Expiration (download) | 5-60 minutes for most use cases | | Expiration (upload) | 5-15 minutes | | Scope | One URL per file, one operation per URL |

import { getPresignedUrl } from "@tigrisdata/storage";

// Short-lived download URL
const { data } = await getPresignedUrl("documents/report.pdf", {
  operation: "get",
  expiresIn: 300, // 5 minutes
});

// Short-lived upload URL with content type restriction
const { data } = await getPresignedUrl("uploads/photo.jpg", {
  operation: "put",
  expiresIn: 600,
  contentType: "image/jpeg", // Client must upload this type
});

Never Do

• Set expiration longer than 24 hours
• Generate presigned URLs for entire bucket prefixes
• Share presigned URLs in public channels (they're secrets)
• Use presigned URLs as permanent links (use public bucket URLs instead)

---

Environment Variable Security

# .env (never commit this file)
TIGRIS_STORAGE_ACCESS_KEY_ID=tid_xxx
TIGRIS_STORAGE_SECRET_ACCESS_KEY=tsec_yyy

# .gitignore (must include)
.env
.env.local
.env.*.local

For CI/CD, use your platform's secrets management:

# GitHub Actions
gh secret set TIGRIS_STORAGE_ACCESS_KEY_ID
gh secret set TIGRIS_STORAGE_SECRET_ACCESS_KEY

# Vercel
vercel env add TIGRIS_STORAGE_ACCESS_KEY_ID

# Fly.io
fly secrets set TIGRIS_STORAGE_ACCESS_KEY_ID=tid_xxx

---

Security Audit Checklist

• [ ] No keys in code — search for tid_ and tsec_ in your repo
• [ ] .env in .gitignore — credentials never committed
• [ ] Keys scoped to buckets — no unassigned keys with global access
• [ ] Roles match need — read-only services use ReadOnly role
• [ ] CORS not overly permissive — no "*" origin with write methods
• [ ] Presigned URLs have short expiry — under 1 hour for most cases
• [ ] Unused keys revoked — no stale keys from former team members or old deployments
• [ ] Separate keys per environment — dev/staging/production use different keys

---

Key Compromise Response

If an access key is exposed (committed to git, leaked in logs, etc.):

# 1. Immediately revoke the compromised key
tigris access-keys delete tid_compromised

# 2. Create a new key
tigris access-keys create "replacement-key"
tigris access-keys assign tid_new --bucket my-bucket --role Editor

# 3. Update all deployments with the new key
# (update .env, CI/CD secrets, deployment configs)

# 4. Audit access — check for unauthorized uploads/downloads
tigris ls t3://my-bucket --recursive -l | sort -k4 -r | head -50

# 5. If key was committed to git, rotate and consider the entire
#    git history compromised — use git-filter-repo to remove it

---

Critical Rules

Always: Create separate keys per environment and concern | Assign keys to specific buckets with minimum required role | Rotate keys periodically (quarterly recommended) | Set CORS to specific origins in production | Use short-lived presigned URLs

Never: Commit keys to git | Use a single key for all environments | Set CORS to "*" with write methods | Share presigned URLs publicly | Keep unused keys active

---

Known Issues

| Problem | Fix | |---------|-----| | CORS preflight fails | Check AllowedOrigins includes your exact origin (with protocol) | | "Access denied" after key rotation | Ensure new key is assigned to bucket with correct role | | Secret key lost | Cannot recover — create new key and reassign | | Browser upload fails silently | Check CORS config includes PUT in AllowedMethods |

---

Related Skills

• file-storage — CLI setup and access key creation
• tigris-s3-migration — CORS and credential setup during migration

Official Documentation

• Tigris: https://www.tigrisdata.com/docs/

Source & license

This open-source skill is cataloged on AgentStack and links to its original source — we do not rehost the code.

• Author: tigrisdata
• Source: tigrisdata/skills
• License: MIT

Install and usage instructions live in the source repository linked above.