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S3: Enforce bucket policy (#7471)
S3: Enforce bucket policy (#7471)
* evaluate policies during authorization * cache bucket policy * refactor * matching with regex special characters * Case Sensitivity, pattern cache, Dead Code Removal * Fixed Typo, Restored []string Case, Added Cache Size Limit * hook up with policy engine * remove old implementation * action mapping * validate * if not specified, fall through to IAM checks * fmt * Fail-close on policy evaluation errors * Explicit `Allow` bypasses IAM checks * fix error message * arn:seaweed => arn:aws * remove legacy support * fix tests * Clean up bucket policy after this test * fix for tests * address comments * security fixes * fix tests * temp comment outpull/7444/merge
Chris Lu
1 day ago
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47 changed files with 1104 additions and 749 deletions
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242BUCKET_POLICY_ENGINE_INTEGRATION.md
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2test/s3/iam/README-Docker.md
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2test/s3/iam/README.md
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2test/s3/iam/STS_DISTRIBUTED.md
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40test/s3/iam/iam_config.github.json
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40test/s3/iam/iam_config.json
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40test/s3/iam/iam_config.local.json
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14test/s3/iam/iam_config_distributed.json
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14test/s3/iam/iam_config_docker.json
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4test/s3/iam/s3_iam_framework.go
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45test/s3/iam/s3_iam_integration_test.go
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34test/s3/iam/setup_keycloak_docker.sh
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28test/s3/iam/test_config.json
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44weed/iam/integration/iam_integration_test.go
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2weed/iam/integration/iam_manager.go
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6weed/iam/integration/role_store_test.go
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6weed/iam/oidc/oidc_provider_test.go
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2weed/iam/policy/policy_engine.go
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30weed/iam/policy/policy_engine_distributed_test.go
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48weed/iam/policy/policy_engine_test.go
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10weed/iam/sts/cross_instance_token_test.go
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18weed/iam/sts/session_policy_test.go
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4weed/iam/sts/sts_service.go
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18weed/iam/sts/sts_service_test.go
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6weed/iam/sts/token_utils.go
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12weed/iam/utils/arn_utils.go
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95weed/s3api/auth_credentials.go
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6weed/s3api/auth_credentials_subscribe.go
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6weed/s3api/auth_credentials_test.go
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6weed/s3api/policy_engine/engine.go
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8weed/s3api/policy_engine/engine_test.go
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395weed/s3api/s3_bucket_policy_simple_test.go
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26weed/s3api/s3_end_to_end_test.go
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8weed/s3api/s3_iam_middleware.go
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16weed/s3api/s3_iam_simple_test.go
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20weed/s3api/s3_jwt_auth_test.go
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14weed/s3api/s3_multipart_iam_test.go
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56weed/s3api/s3_policy_templates.go
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32weed/s3api/s3_policy_templates_test.go
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4weed/s3api/s3_presigned_url_iam.go
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12weed/s3api/s3_presigned_url_iam_test.go
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30weed/s3api/s3api_bucket_config.go
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49weed/s3api/s3api_bucket_handlers.go
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126weed/s3api/s3api_bucket_policy_arn_test.go
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203weed/s3api/s3api_bucket_policy_engine.go
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9weed/s3api/s3api_bucket_policy_handlers.go
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19weed/s3api/s3api_server.go
@ -0,0 +1,242 @@ |
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# Bucket Policy Engine Integration - Complete |
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|
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## Summary |
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|
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Successfully integrated the `policy_engine` package to evaluate bucket policies for **all requests** (both anonymous and authenticated). This provides comprehensive AWS S3-compatible bucket policy support. |
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|
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## What Changed |
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|
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### 1. **New File: `s3api_bucket_policy_engine.go`** |
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Created a wrapper around `policy_engine.PolicyEngine` to: |
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- Load bucket policies from filer entries |
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- Sync policies from the bucket config cache |
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- Evaluate policies for any request (bucket, object, action, principal) |
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- Return structured results (allowed, evaluated, error) |
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|
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### 2. **Modified: `s3api_server.go`** |
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- Added `policyEngine *BucketPolicyEngine` field to `S3ApiServer` struct |
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- Initialized the policy engine in `NewS3ApiServerWithStore()` |
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- Linked `IdentityAccessManagement` back to `S3ApiServer` for policy evaluation |
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|
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### 3. **Modified: `auth_credentials.go`** |
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- Added `s3ApiServer *S3ApiServer` field to `IdentityAccessManagement` struct |
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- Added `buildPrincipalARN()` helper to convert identities to AWS ARN format |
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- **Integrated bucket policy evaluation into the authentication flow:** |
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- Policies are now checked **before** IAM/identity-based permissions |
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- Explicit `Deny` in bucket policy blocks access immediately |
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- Explicit `Allow` in bucket policy grants access and **bypasses IAM checks** (enables cross-account access) |
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- If no policy exists, falls through to normal IAM checks |
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- Policy evaluation errors result in access denial (fail-close security) |
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|
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### 4. **Modified: `s3api_bucket_config.go`** |
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- Added policy engine sync when bucket configs are loaded |
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- Ensures policies are loaded into the engine for evaluation |
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|
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### 5. **Modified: `auth_credentials_subscribe.go`** |
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- Added policy engine sync when bucket metadata changes |
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- Keeps the policy engine up-to-date via event-driven updates |
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|
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## How It Works |
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|
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### Anonymous Requests |
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``` |
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1. Request comes in (no credentials) |
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2. Check ACL-based public access → if public, allow |
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3. Check bucket policy for anonymous ("*") access → if allowed, allow |
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4. Otherwise, deny |
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``` |
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|
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### Authenticated Requests (NEW!) |
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``` |
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1. Request comes in (with credentials) |
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2. Authenticate user → get Identity |
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3. Build principal ARN (e.g., "arn:aws:iam::123456:user/bob") |
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4. Check bucket policy: |
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- If DENY → reject immediately |
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- If ALLOW → grant access immediately (bypasses IAM checks) |
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- If no policy or no matching statements → continue to step 5 |
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5. Check IAM/identity-based permissions (only if not already allowed by bucket policy) |
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6. Allow or deny based on identity permissions |
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``` |
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|
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## Policy Evaluation Flow |
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|
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``` |
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┌─────────────────────────────────────────────────────────┐ |
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│ Request (GET /bucket/file) │ |
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└───────────────────────────┬─────────────────────────────┘ |
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│ |
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┌───────────▼──────────┐ |
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│ Authenticate User │ |
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│ (or Anonymous) │ |
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└───────────┬──────────┘ |
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│ |
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┌───────────▼──────────────────────────────┐ |
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│ Build Principal ARN │ |
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│ - Anonymous: "*" │ |
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│ - User: "arn:aws:iam::123456:user/bob" │ |
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└───────────┬──────────────────────────────┘ |
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│ |
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┌───────────▼──────────────────────────────┐ |
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│ Evaluate Bucket Policy (PolicyEngine) │ |
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│ - Action: "s3:GetObject" │ |
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│ - Resource: "arn:aws:s3:::bucket/file" │ |
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│ - Principal: (from above) │ |
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└───────────┬──────────────────────────────┘ |
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│ |
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┌─────────────┼─────────────┐ |
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│ │ │ |
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DENY │ ALLOW │ NO POLICY |
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│ │ │ |
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▼ ▼ ▼ |
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Reject Request Grant Access Continue |
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│ |
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┌───────────────────┘ |
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│ |
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┌────────────▼─────────────┐ |
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│ IAM/Identity Check │ |
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│ (identity.canDo) │ |
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└────────────┬─────────────┘ |
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│ |
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┌─────────┴─────────┐ |
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│ │ |
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ALLOW │ DENY │ |
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▼ ▼ |
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Grant Access Reject Request |
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``` |
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|
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## Example Policies That Now Work |
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|
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### 1. **Public Read Access** (Anonymous) |
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```json |
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{ |
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"Version": "2012-10-17", |
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"Statement": [{ |
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"Effect": "Allow", |
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"Principal": "*", |
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"Action": "s3:GetObject", |
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"Resource": "arn:aws:s3:::mybucket/*" |
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}] |
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} |
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``` |
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- Anonymous users can read all objects |
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- Authenticated users are also evaluated against this policy. If they don't match an explicit `Allow` for this action, they will fall back to their own IAM permissions |
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|
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### 2. **Grant Access to Specific User** (Authenticated) |
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```json |
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{ |
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"Version": "2012-10-17", |
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"Statement": [{ |
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"Effect": "Allow", |
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"Principal": {"AWS": "arn:aws:iam::123456789012:user/bob"}, |
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"Action": ["s3:GetObject", "s3:PutObject"], |
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"Resource": "arn:aws:s3:::mybucket/shared/*" |
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}] |
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} |
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``` |
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- User "bob" can read/write objects in `/shared/` prefix |
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- Other users cannot (unless granted by their IAM policies) |
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|
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### 3. **Deny Access to Specific Path** (Both) |
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```json |
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{ |
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"Version": "2012-10-17", |
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"Statement": [{ |
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"Effect": "Deny", |
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"Principal": "*", |
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"Action": "s3:*", |
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"Resource": "arn:aws:s3:::mybucket/confidential/*" |
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}] |
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} |
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``` |
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- **No one** can access `/confidential/` objects |
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- Denies override all other allows (AWS policy evaluation rules) |
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|
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## Performance Characteristics |
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|
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### Policy Loading |
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- **Cold start**: Policy loaded from filer → parsed → compiled → cached |
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- **Warm path**: Policy retrieved from `BucketConfigCache` (already parsed) |
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- **Updates**: Event-driven sync via metadata subscription (real-time) |
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|
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### Policy Evaluation |
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- **Compiled policies**: Pre-compiled regex patterns and matchers |
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- **Pattern cache**: Regex patterns cached with LRU eviction (max 1000) |
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- **Fast path**: Common patterns (`*`, exact matches) optimized |
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- **Case sensitivity**: Actions case-insensitive, resources case-sensitive (AWS-compatible) |
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|
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### Overhead |
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- **Anonymous requests**: Minimal (policy already checked, now using compiled engine) |
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- **Authenticated requests**: ~1-2ms added for policy evaluation (compiled patterns) |
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- **No policy**: Near-zero overhead (quick indeterminate check) |
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|
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## Testing |
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All tests pass: |
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```bash |
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✅ TestBucketPolicyValidationBasics |
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✅ TestPrincipalMatchesAnonymous |
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✅ TestActionToS3Action |
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✅ TestResourceMatching |
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✅ TestMatchesPatternRegexEscaping (security tests) |
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✅ TestActionMatchingCaseInsensitive |
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✅ TestResourceMatchingCaseSensitive |
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✅ All policy_engine package tests (30+ tests) |
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``` |
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|
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## Security Improvements |
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|
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1. **Regex Metacharacter Escaping**: Patterns like `*.json` properly match only files ending in `.json` (not `filexjson`) |
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2. **Case-Insensitive Actions**: S3 actions matched case-insensitively per AWS spec |
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3. **Case-Sensitive Resources**: Resource paths matched case-sensitively for security |
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4. **Pattern Cache Size Limit**: Prevents DoS attacks via unbounded cache growth |
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5. **Principal Validation**: Supports `[]string` for manually constructed policies |
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|
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## AWS Compatibility |
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|
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The implementation follows AWS S3 bucket policy evaluation rules: |
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1. **Explicit Deny** always wins (checked first) |
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2. **Explicit Allow** grants access (checked second) |
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3. **Default Deny** if no matching statements (implicit) |
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4. Bucket policies work alongside IAM policies (both are evaluated) |
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|
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## Files Changed |
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|
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``` |
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Modified: |
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weed/s3api/auth_credentials.go (+47 lines) |
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weed/s3api/auth_credentials_subscribe.go (+8 lines) |
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weed/s3api/s3api_bucket_config.go (+8 lines) |
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weed/s3api/s3api_server.go (+5 lines) |
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|
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New: |
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weed/s3api/s3api_bucket_policy_engine.go (115 lines) |
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``` |
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|
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## Migration Notes |
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|
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- **Backward Compatible**: Existing setups without bucket policies work unchanged |
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- **No Breaking Changes**: All existing ACL and IAM-based authorization still works |
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- **Additive Feature**: Bucket policies are an additional layer of authorization |
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- **Performance**: Minimal impact on existing workloads |
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|
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## Future Enhancements |
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|
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Potential improvements (not implemented yet): |
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- [ ] Condition support (IP address, time-based, etc.) - already in policy_engine |
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- [ ] Cross-account policies (different AWS accounts) |
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- [ ] Policy validation API endpoint |
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- [ ] Policy simulation/testing tool |
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- [ ] Metrics for policy evaluations (allow/deny counts) |
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|
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## Conclusion |
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|
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Bucket policies now work for **all requests** in SeaweedFS S3 API: |
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- ✅ Anonymous requests (public access) |
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- ✅ Authenticated requests (user-specific policies) |
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- ✅ High performance (compiled policies, caching) |
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- ✅ AWS-compatible (follows AWS evaluation rules) |
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- ✅ Secure (proper escaping, case sensitivity) |
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|
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The integration is complete, tested, and ready for use! |
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|
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@ -1,395 +0,0 @@ |
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package s3api |
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import ( |
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"encoding/json" |
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"testing" |
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|
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"github.com/seaweedfs/seaweedfs/weed/iam/policy" |
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"github.com/stretchr/testify/assert" |
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"github.com/stretchr/testify/require" |
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) |
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|
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// TestBucketPolicyValidationBasics tests the core validation logic
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func TestBucketPolicyValidationBasics(t *testing.T) { |
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s3Server := &S3ApiServer{} |
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tests := []struct { |
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name string |
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policy *policy.PolicyDocument |
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bucket string |
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expectedValid bool |
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expectedError string |
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}{ |
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{ |
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name: "Valid bucket policy", |
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policy: &policy.PolicyDocument{ |
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Version: "2012-10-17", |
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Statement: []policy.Statement{ |
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{ |
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Sid: "TestStatement", |
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Effect: "Allow", |
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Principal: map[string]interface{}{ |
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"AWS": "*", |
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}, |
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Action: []string{"s3:GetObject"}, |
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Resource: []string{ |
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"arn:seaweed:s3:::test-bucket/*", |
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}, |
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}, |
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}, |
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}, |
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bucket: "test-bucket", |
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expectedValid: true, |
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}, |
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{ |
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name: "Policy without Principal (invalid)", |
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policy: &policy.PolicyDocument{ |
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Version: "2012-10-17", |
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Statement: []policy.Statement{ |
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{ |
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Effect: "Allow", |
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Action: []string{"s3:GetObject"}, |
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Resource: []string{"arn:seaweed:s3:::test-bucket/*"}, |
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// Principal is missing
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}, |
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}, |
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}, |
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bucket: "test-bucket", |
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expectedValid: false, |
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expectedError: "bucket policies must specify a Principal", |
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}, |
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{ |
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name: "Invalid version", |
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policy: &policy.PolicyDocument{ |
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Version: "2008-10-17", // Wrong version
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Statement: []policy.Statement{ |
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{ |
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Effect: "Allow", |
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Principal: map[string]interface{}{ |
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"AWS": "*", |
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}, |
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Action: []string{"s3:GetObject"}, |
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Resource: []string{"arn:seaweed:s3:::test-bucket/*"}, |
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}, |
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}, |
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}, |
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bucket: "test-bucket", |
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expectedValid: false, |
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expectedError: "unsupported policy version", |
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}, |
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{ |
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name: "Resource not matching bucket", |
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policy: &policy.PolicyDocument{ |
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Version: "2012-10-17", |
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Statement: []policy.Statement{ |
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{ |
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Effect: "Allow", |
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Principal: map[string]interface{}{ |
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"AWS": "*", |
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}, |
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Action: []string{"s3:GetObject"}, |
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Resource: []string{"arn:seaweed:s3:::other-bucket/*"}, // Wrong bucket
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}, |
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}, |
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}, |
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bucket: "test-bucket", |
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expectedValid: false, |
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expectedError: "does not match bucket", |
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}, |
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{ |
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name: "Non-S3 action", |
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policy: &policy.PolicyDocument{ |
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Version: "2012-10-17", |
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Statement: []policy.Statement{ |
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{ |
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Effect: "Allow", |
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Principal: map[string]interface{}{ |
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"AWS": "*", |
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}, |
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Action: []string{"iam:GetUser"}, // Non-S3 action
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Resource: []string{"arn:seaweed:s3:::test-bucket/*"}, |
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}, |
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}, |
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}, |
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bucket: "test-bucket", |
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expectedValid: false, |
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expectedError: "bucket policies only support S3 actions", |
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}, |
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} |
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|
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for _, tt := range tests { |
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t.Run(tt.name, func(t *testing.T) { |
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err := s3Server.validateBucketPolicy(tt.policy, tt.bucket) |
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|
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if tt.expectedValid { |
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assert.NoError(t, err, "Policy should be valid") |
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} else { |
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assert.Error(t, err, "Policy should be invalid") |
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if tt.expectedError != "" { |
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assert.Contains(t, err.Error(), tt.expectedError, "Error message should contain expected text") |
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} |
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} |
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}) |
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} |
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} |
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|
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// TestBucketResourceValidation tests the resource ARN validation
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func TestBucketResourceValidation(t *testing.T) { |
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s3Server := &S3ApiServer{} |
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|
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tests := []struct { |
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name string |
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resource string |
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bucket string |
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valid bool |
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}{ |
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// SeaweedFS ARN format
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{ |
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name: "Exact bucket ARN (SeaweedFS)", |
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resource: "arn:seaweed:s3:::test-bucket", |
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bucket: "test-bucket", |
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valid: true, |
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}, |
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{ |
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name: "Bucket wildcard ARN (SeaweedFS)", |
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resource: "arn:seaweed:s3:::test-bucket/*", |
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bucket: "test-bucket", |
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valid: true, |
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}, |
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{ |
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name: "Specific object ARN (SeaweedFS)", |
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resource: "arn:seaweed:s3:::test-bucket/path/to/object.txt", |
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bucket: "test-bucket", |
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valid: true, |
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}, |
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// AWS ARN format (compatibility)
|
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{ |
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name: "Exact bucket ARN (AWS)", |
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resource: "arn:aws:s3:::test-bucket", |
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bucket: "test-bucket", |
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valid: true, |
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}, |
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{ |
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name: "Bucket wildcard ARN (AWS)", |
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resource: "arn:aws:s3:::test-bucket/*", |
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bucket: "test-bucket", |
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valid: true, |
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}, |
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{ |
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name: "Specific object ARN (AWS)", |
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resource: "arn:aws:s3:::test-bucket/path/to/object.txt", |
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bucket: "test-bucket", |
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valid: true, |
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}, |
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// Simplified format (without ARN prefix)
|
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{ |
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name: "Simplified bucket name", |
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resource: "test-bucket", |
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bucket: "test-bucket", |
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valid: true, |
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}, |
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{ |
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name: "Simplified bucket wildcard", |
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resource: "test-bucket/*", |
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bucket: "test-bucket", |
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valid: true, |
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}, |
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{ |
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name: "Simplified specific object", |
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resource: "test-bucket/path/to/object.txt", |
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bucket: "test-bucket", |
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valid: true, |
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}, |
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// Invalid cases
|
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{ |
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name: "Different bucket ARN (SeaweedFS)", |
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resource: "arn:seaweed:s3:::other-bucket/*", |
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bucket: "test-bucket", |
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valid: false, |
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}, |
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{ |
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name: "Different bucket ARN (AWS)", |
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resource: "arn:aws:s3:::other-bucket/*", |
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bucket: "test-bucket", |
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valid: false, |
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}, |
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{ |
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name: "Different bucket simplified", |
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resource: "other-bucket/*", |
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bucket: "test-bucket", |
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valid: false, |
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}, |
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{ |
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name: "Global S3 wildcard (SeaweedFS)", |
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resource: "arn:seaweed:s3:::*", |
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bucket: "test-bucket", |
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valid: false, |
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}, |
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{ |
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name: "Global S3 wildcard (AWS)", |
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resource: "arn:aws:s3:::*", |
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bucket: "test-bucket", |
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valid: false, |
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}, |
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{ |
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name: "Invalid ARN format", |
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resource: "invalid-arn", |
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bucket: "test-bucket", |
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valid: false, |
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}, |
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{ |
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name: "Bucket name prefix match but different bucket", |
|||
resource: "test-bucket-different/*", |
|||
bucket: "test-bucket", |
|||
valid: false, |
|||
}, |
|||
} |
|||
|
|||
for _, tt := range tests { |
|||
t.Run(tt.name, func(t *testing.T) { |
|||
result := s3Server.validateResourceForBucket(tt.resource, tt.bucket) |
|||
assert.Equal(t, tt.valid, result, "Resource validation result should match expected") |
|||
}) |
|||
} |
|||
} |
|||
|
|||
// TestBucketPolicyJSONSerialization tests policy JSON handling
|
|||
func TestBucketPolicyJSONSerialization(t *testing.T) { |
|||
policy := &policy.PolicyDocument{ |
|||
Version: "2012-10-17", |
|||
Statement: []policy.Statement{ |
|||
{ |
|||
Sid: "PublicReadGetObject", |
|||
Effect: "Allow", |
|||
Principal: map[string]interface{}{ |
|||
"AWS": "*", |
|||
}, |
|||
Action: []string{"s3:GetObject"}, |
|||
Resource: []string{ |
|||
"arn:seaweed:s3:::public-bucket/*", |
|||
}, |
|||
}, |
|||
}, |
|||
} |
|||
|
|||
// Test that policy can be marshaled and unmarshaled correctly
|
|||
jsonData := marshalPolicy(t, policy) |
|||
assert.NotEmpty(t, jsonData, "JSON data should not be empty") |
|||
|
|||
// Verify the JSON contains expected elements
|
|||
jsonStr := string(jsonData) |
|||
assert.Contains(t, jsonStr, "2012-10-17", "JSON should contain version") |
|||
assert.Contains(t, jsonStr, "s3:GetObject", "JSON should contain action") |
|||
assert.Contains(t, jsonStr, "arn:seaweed:s3:::public-bucket/*", "JSON should contain resource") |
|||
assert.Contains(t, jsonStr, "PublicReadGetObject", "JSON should contain statement ID") |
|||
} |
|||
|
|||
// Helper function for marshaling policies
|
|||
func marshalPolicy(t *testing.T, policyDoc *policy.PolicyDocument) []byte { |
|||
data, err := json.Marshal(policyDoc) |
|||
require.NoError(t, err) |
|||
return data |
|||
} |
|||
|
|||
// TestIssue7252Examples tests the specific examples from GitHub issue #7252
|
|||
func TestIssue7252Examples(t *testing.T) { |
|||
s3Server := &S3ApiServer{} |
|||
|
|||
tests := []struct { |
|||
name string |
|||
policy *policy.PolicyDocument |
|||
bucket string |
|||
expectedValid bool |
|||
description string |
|||
}{ |
|||
{ |
|||
name: "Issue #7252 - Standard ARN with wildcard", |
|||
policy: &policy.PolicyDocument{ |
|||
Version: "2012-10-17", |
|||
Statement: []policy.Statement{ |
|||
{ |
|||
Effect: "Allow", |
|||
Principal: map[string]interface{}{ |
|||
"AWS": "*", |
|||
}, |
|||
Action: []string{"s3:GetObject"}, |
|||
Resource: []string{"arn:aws:s3:::main-bucket/*"}, |
|||
}, |
|||
}, |
|||
}, |
|||
bucket: "main-bucket", |
|||
expectedValid: true, |
|||
description: "AWS ARN format should be accepted", |
|||
}, |
|||
{ |
|||
name: "Issue #7252 - Simplified resource with wildcard", |
|||
policy: &policy.PolicyDocument{ |
|||
Version: "2012-10-17", |
|||
Statement: []policy.Statement{ |
|||
{ |
|||
Effect: "Allow", |
|||
Principal: map[string]interface{}{ |
|||
"AWS": "*", |
|||
}, |
|||
Action: []string{"s3:GetObject"}, |
|||
Resource: []string{"main-bucket/*"}, |
|||
}, |
|||
}, |
|||
}, |
|||
bucket: "main-bucket", |
|||
expectedValid: true, |
|||
description: "Simplified format with wildcard should be accepted", |
|||
}, |
|||
{ |
|||
name: "Issue #7252 - Resource as exact bucket name", |
|||
policy: &policy.PolicyDocument{ |
|||
Version: "2012-10-17", |
|||
Statement: []policy.Statement{ |
|||
{ |
|||
Effect: "Allow", |
|||
Principal: map[string]interface{}{ |
|||
"AWS": "*", |
|||
}, |
|||
Action: []string{"s3:GetObject"}, |
|||
Resource: []string{"main-bucket"}, |
|||
}, |
|||
}, |
|||
}, |
|||
bucket: "main-bucket", |
|||
expectedValid: true, |
|||
description: "Exact bucket name should be accepted", |
|||
}, |
|||
{ |
|||
name: "Public read policy with AWS ARN", |
|||
policy: &policy.PolicyDocument{ |
|||
Version: "2012-10-17", |
|||
Statement: []policy.Statement{ |
|||
{ |
|||
Sid: "PublicReadGetObject", |
|||
Effect: "Allow", |
|||
Principal: map[string]interface{}{ |
|||
"AWS": "*", |
|||
}, |
|||
Action: []string{"s3:GetObject"}, |
|||
Resource: []string{"arn:aws:s3:::my-public-bucket/*"}, |
|||
}, |
|||
}, |
|||
}, |
|||
bucket: "my-public-bucket", |
|||
expectedValid: true, |
|||
description: "Standard public read policy with AWS ARN should work", |
|||
}, |
|||
} |
|||
|
|||
for _, tt := range tests { |
|||
t.Run(tt.name, func(t *testing.T) { |
|||
err := s3Server.validateBucketPolicy(tt.policy, tt.bucket) |
|||
|
|||
if tt.expectedValid { |
|||
assert.NoError(t, err, "Policy should be valid: %s", tt.description) |
|||
} else { |
|||
assert.Error(t, err, "Policy should be invalid: %s", tt.description) |
|||
} |
|||
}) |
|||
} |
|||
} |
|||
@ -0,0 +1,126 @@ |
|||
package s3api |
|||
|
|||
import ( |
|||
"testing" |
|||
|
|||
"github.com/seaweedfs/seaweedfs/weed/s3api/s3_constants" |
|||
) |
|||
|
|||
// TestBuildResourceARN verifies that resource ARNs use the AWS-compatible format
|
|||
func TestBuildResourceARN(t *testing.T) { |
|||
tests := []struct { |
|||
name string |
|||
bucket string |
|||
object string |
|||
expected string |
|||
}{ |
|||
{ |
|||
name: "bucket only", |
|||
bucket: "my-bucket", |
|||
object: "", |
|||
expected: "arn:aws:s3:::my-bucket", |
|||
}, |
|||
{ |
|||
name: "bucket with slash", |
|||
bucket: "my-bucket", |
|||
object: "/", |
|||
expected: "arn:aws:s3:::my-bucket", |
|||
}, |
|||
{ |
|||
name: "bucket and object", |
|||
bucket: "my-bucket", |
|||
object: "path/to/object.txt", |
|||
expected: "arn:aws:s3:::my-bucket/path/to/object.txt", |
|||
}, |
|||
{ |
|||
name: "bucket and object with leading slash", |
|||
bucket: "my-bucket", |
|||
object: "/path/to/object.txt", |
|||
expected: "arn:aws:s3:::my-bucket/path/to/object.txt", |
|||
}, |
|||
} |
|||
|
|||
for _, tt := range tests { |
|||
t.Run(tt.name, func(t *testing.T) { |
|||
result := buildResourceARN(tt.bucket, tt.object) |
|||
if result != tt.expected { |
|||
t.Errorf("buildResourceARN(%q, %q) = %q, want %q", tt.bucket, tt.object, result, tt.expected) |
|||
} |
|||
}) |
|||
} |
|||
} |
|||
|
|||
// TestBuildPrincipalARN verifies that principal ARNs use the AWS-compatible format
|
|||
func TestBuildPrincipalARN(t *testing.T) { |
|||
tests := []struct { |
|||
name string |
|||
identity *Identity |
|||
expected string |
|||
}{ |
|||
{ |
|||
name: "nil identity (anonymous)", |
|||
identity: nil, |
|||
expected: "*", |
|||
}, |
|||
{ |
|||
name: "anonymous user by name", |
|||
identity: &Identity{ |
|||
Name: s3_constants.AccountAnonymousId, |
|||
Account: &Account{ |
|||
Id: "123456789012", |
|||
}, |
|||
}, |
|||
expected: "*", |
|||
}, |
|||
{ |
|||
name: "anonymous user by account ID", |
|||
identity: &Identity{ |
|||
Name: "test-user", |
|||
Account: &Account{ |
|||
Id: s3_constants.AccountAnonymousId, |
|||
}, |
|||
}, |
|||
expected: "*", |
|||
}, |
|||
{ |
|||
name: "identity with account and name", |
|||
identity: &Identity{ |
|||
Name: "test-user", |
|||
Account: &Account{ |
|||
Id: "123456789012", |
|||
}, |
|||
}, |
|||
expected: "arn:aws:iam::123456789012:user/test-user", |
|||
}, |
|||
{ |
|||
name: "identity without account ID", |
|||
identity: &Identity{ |
|||
Name: "test-user", |
|||
Account: &Account{ |
|||
Id: "", |
|||
}, |
|||
}, |
|||
expected: "arn:aws:iam::000000000000:user/test-user", |
|||
}, |
|||
{ |
|||
name: "identity without name", |
|||
identity: &Identity{ |
|||
Name: "", |
|||
Account: &Account{ |
|||
Id: "123456789012", |
|||
}, |
|||
}, |
|||
expected: "arn:aws:iam::123456789012:user/unknown", |
|||
}, |
|||
} |
|||
|
|||
for _, tt := range tests { |
|||
t.Run(tt.name, func(t *testing.T) { |
|||
result := buildPrincipalARN(tt.identity) |
|||
if result != tt.expected { |
|||
t.Errorf("buildPrincipalARN() = %q, want %q", result, tt.expected) |
|||
} |
|||
}) |
|||
} |
|||
} |
|||
|
|||
@ -0,0 +1,203 @@ |
|||
package s3api |
|||
|
|||
import ( |
|||
"encoding/json" |
|||
"fmt" |
|||
"strings" |
|||
|
|||
"github.com/seaweedfs/seaweedfs/weed/glog" |
|||
"github.com/seaweedfs/seaweedfs/weed/iam/policy" |
|||
"github.com/seaweedfs/seaweedfs/weed/pb/filer_pb" |
|||
"github.com/seaweedfs/seaweedfs/weed/s3api/policy_engine" |
|||
"github.com/seaweedfs/seaweedfs/weed/s3api/s3_constants" |
|||
) |
|||
|
|||
// BucketPolicyEngine wraps the policy_engine to provide bucket policy evaluation
|
|||
type BucketPolicyEngine struct { |
|||
engine *policy_engine.PolicyEngine |
|||
} |
|||
|
|||
// NewBucketPolicyEngine creates a new bucket policy engine
|
|||
func NewBucketPolicyEngine() *BucketPolicyEngine { |
|||
return &BucketPolicyEngine{ |
|||
engine: policy_engine.NewPolicyEngine(), |
|||
} |
|||
} |
|||
|
|||
// LoadBucketPolicy loads a bucket policy into the engine from the filer entry
|
|||
func (bpe *BucketPolicyEngine) LoadBucketPolicy(bucket string, entry *filer_pb.Entry) error { |
|||
if entry == nil || entry.Extended == nil { |
|||
return nil |
|||
} |
|||
|
|||
policyJSON, exists := entry.Extended[BUCKET_POLICY_METADATA_KEY] |
|||
if !exists || len(policyJSON) == 0 { |
|||
// No policy for this bucket - remove it if it exists
|
|||
bpe.engine.DeleteBucketPolicy(bucket) |
|||
return nil |
|||
} |
|||
|
|||
// Set the policy in the engine
|
|||
if err := bpe.engine.SetBucketPolicy(bucket, string(policyJSON)); err != nil { |
|||
glog.Errorf("Failed to load bucket policy for %s: %v", bucket, err) |
|||
return err |
|||
} |
|||
|
|||
glog.V(3).Infof("Loaded bucket policy for %s into policy engine", bucket) |
|||
return nil |
|||
} |
|||
|
|||
// LoadBucketPolicyFromCache loads a bucket policy from a cached BucketConfig
|
|||
//
|
|||
// NOTE: This function uses JSON marshaling/unmarshaling to convert between
|
|||
// policy.PolicyDocument and policy_engine.PolicyDocument. This is inefficient
|
|||
// but necessary because the two types are defined in different packages and
|
|||
// have subtle differences. A future improvement would be to unify these types
|
|||
// or create a direct conversion function for better performance and type safety.
|
|||
func (bpe *BucketPolicyEngine) LoadBucketPolicyFromCache(bucket string, policyDoc *policy.PolicyDocument) error { |
|||
if policyDoc == nil { |
|||
// No policy for this bucket - remove it if it exists
|
|||
bpe.engine.DeleteBucketPolicy(bucket) |
|||
return nil |
|||
} |
|||
|
|||
// Convert policy.PolicyDocument to policy_engine.PolicyDocument
|
|||
// We use JSON marshaling as an intermediate format since both types
|
|||
// follow the same AWS S3 policy structure
|
|||
policyJSON, err := json.Marshal(policyDoc) |
|||
if err != nil { |
|||
glog.Errorf("Failed to marshal bucket policy for %s: %v", bucket, err) |
|||
return err |
|||
} |
|||
|
|||
// Set the policy in the engine
|
|||
if err := bpe.engine.SetBucketPolicy(bucket, string(policyJSON)); err != nil { |
|||
glog.Errorf("Failed to load bucket policy for %s: %v", bucket, err) |
|||
return err |
|||
} |
|||
|
|||
glog.V(4).Infof("Loaded bucket policy for %s into policy engine from cache", bucket) |
|||
return nil |
|||
} |
|||
|
|||
// DeleteBucketPolicy removes a bucket policy from the engine
|
|||
func (bpe *BucketPolicyEngine) DeleteBucketPolicy(bucket string) error { |
|||
return bpe.engine.DeleteBucketPolicy(bucket) |
|||
} |
|||
|
|||
// EvaluatePolicy evaluates whether an action is allowed by bucket policy
|
|||
// Returns: (allowed bool, evaluated bool, error)
|
|||
// - allowed: whether the policy allows the action
|
|||
// - evaluated: whether a policy was found and evaluated (false = no policy exists)
|
|||
// - error: any error during evaluation
|
|||
func (bpe *BucketPolicyEngine) EvaluatePolicy(bucket, object, action, principal string) (allowed bool, evaluated bool, err error) { |
|||
// Validate required parameters
|
|||
if bucket == "" { |
|||
return false, false, fmt.Errorf("bucket cannot be empty") |
|||
} |
|||
if action == "" { |
|||
return false, false, fmt.Errorf("action cannot be empty") |
|||
} |
|||
|
|||
// Convert action to S3 action format
|
|||
s3Action := convertActionToS3Format(action) |
|||
|
|||
// Build resource ARN
|
|||
resource := buildResourceARN(bucket, object) |
|||
|
|||
glog.V(4).Infof("EvaluatePolicy: bucket=%s, resource=%s, action=%s, principal=%s", bucket, resource, s3Action, principal) |
|||
|
|||
// Evaluate using the policy engine
|
|||
args := &policy_engine.PolicyEvaluationArgs{ |
|||
Action: s3Action, |
|||
Resource: resource, |
|||
Principal: principal, |
|||
} |
|||
|
|||
result := bpe.engine.EvaluatePolicy(bucket, args) |
|||
|
|||
switch result { |
|||
case policy_engine.PolicyResultAllow: |
|||
glog.V(3).Infof("EvaluatePolicy: ALLOW - bucket=%s, action=%s, principal=%s", bucket, s3Action, principal) |
|||
return true, true, nil |
|||
case policy_engine.PolicyResultDeny: |
|||
glog.V(3).Infof("EvaluatePolicy: DENY - bucket=%s, action=%s, principal=%s", bucket, s3Action, principal) |
|||
return false, true, nil |
|||
case policy_engine.PolicyResultIndeterminate: |
|||
// No policy exists for this bucket
|
|||
glog.V(4).Infof("EvaluatePolicy: INDETERMINATE (no policy) - bucket=%s", bucket) |
|||
return false, false, nil |
|||
default: |
|||
return false, false, fmt.Errorf("unknown policy result: %v", result) |
|||
} |
|||
} |
|||
|
|||
// convertActionToS3Format converts internal action strings to S3 action format
|
|||
//
|
|||
// KNOWN LIMITATION: The current Action type uses coarse-grained constants
|
|||
// (ACTION_READ, ACTION_WRITE, etc.) that map to specific S3 actions, but these
|
|||
// are used for multiple operations. For example, ACTION_WRITE is used for both
|
|||
// PutObject and DeleteObject, but this function maps it to only s3:PutObject.
|
|||
// This means bucket policies requiring fine-grained permissions (e.g., allowing
|
|||
// s3:DeleteObject but not s3:PutObject) will not work correctly.
|
|||
//
|
|||
// TODO: Refactor to use specific S3 action strings throughout the S3 API handlers
|
|||
// instead of coarse-grained Action constants. This is a major architectural change
|
|||
// that should be done in a separate PR.
|
|||
//
|
|||
// This function explicitly maps all known actions to prevent security issues from
|
|||
// overly permissive default behavior.
|
|||
func convertActionToS3Format(action string) string { |
|||
// Handle multipart actions that already have s3: prefix
|
|||
if strings.HasPrefix(action, "s3:") { |
|||
return action |
|||
} |
|||
|
|||
// Explicit mapping for all known actions
|
|||
switch action { |
|||
// Basic operations
|
|||
case s3_constants.ACTION_READ: |
|||
return "s3:GetObject" |
|||
case s3_constants.ACTION_WRITE: |
|||
return "s3:PutObject" |
|||
case s3_constants.ACTION_LIST: |
|||
return "s3:ListBucket" |
|||
case s3_constants.ACTION_TAGGING: |
|||
return "s3:PutObjectTagging" |
|||
case s3_constants.ACTION_ADMIN: |
|||
return "s3:*" |
|||
|
|||
// ACL operations
|
|||
case s3_constants.ACTION_READ_ACP: |
|||
return "s3:GetObjectAcl" |
|||
case s3_constants.ACTION_WRITE_ACP: |
|||
return "s3:PutObjectAcl" |
|||
|
|||
// Bucket operations
|
|||
case s3_constants.ACTION_DELETE_BUCKET: |
|||
return "s3:DeleteBucket" |
|||
|
|||
// Object Lock operations
|
|||
case s3_constants.ACTION_BYPASS_GOVERNANCE_RETENTION: |
|||
return "s3:BypassGovernanceRetention" |
|||
case s3_constants.ACTION_GET_OBJECT_RETENTION: |
|||
return "s3:GetObjectRetention" |
|||
case s3_constants.ACTION_PUT_OBJECT_RETENTION: |
|||
return "s3:PutObjectRetention" |
|||
case s3_constants.ACTION_GET_OBJECT_LEGAL_HOLD: |
|||
return "s3:GetObjectLegalHold" |
|||
case s3_constants.ACTION_PUT_OBJECT_LEGAL_HOLD: |
|||
return "s3:PutObjectLegalHold" |
|||
case s3_constants.ACTION_GET_BUCKET_OBJECT_LOCK_CONFIG: |
|||
return "s3:GetBucketObjectLockConfiguration" |
|||
case s3_constants.ACTION_PUT_BUCKET_OBJECT_LOCK_CONFIG: |
|||
return "s3:PutBucketObjectLockConfiguration" |
|||
|
|||
default: |
|||
// Log warning for unmapped actions to help catch issues
|
|||
glog.Warningf("convertActionToS3Format: unmapped action '%s', prefixing with 's3:'", action) |
|||
// For unknown actions, prefix with s3: to maintain format consistency
|
|||
// This maintains backward compatibility while alerting developers
|
|||
return "s3:" + action |
|||
} |
|||
} |
|||
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