fix(s3): add x-amz-grant-* headers to policy condition values (#2031)

rustfs/src/auth.rs

@@ -508,6 +508,25 @@ pub fn get_condition_values(
         clone_header.remove(*obj_lock);
     }
 
+    // S3 policy condition keys use "x-amz-grant-*" (policy key s3:x-amz-grant-* -> name() returns x-amz-grant-*)
+    for grant_header in &[
+        "x-amz-grant-full-control",
+        "x-amz-grant-read",
+        "x-amz-grant-write",
+        "x-amz-grant-read-acp",
+        "x-amz-grant-write-acp",
+    ] {
+        let values = clone_header
+            .get_all(*grant_header)
+            .iter()
+            .map(|v| v.to_str().unwrap_or("").to_string())
+            .collect::<Vec<String>>();
+        if !values.is_empty() {
+            args.insert((*grant_header).to_string(), values);
+        }
+        clone_header.remove(*grant_header);
+    }
+
     for (key, _values) in clone_header.iter() {
         if key.as_str().eq_ignore_ascii_case("x-amz-tagging") {
             continue;
@@ -1038,6 +1057,25 @@ mod tests {
         );
     }
 
+    #[test]
+    fn test_get_condition_values_with_grant_headers() {
+        let cred = create_test_credentials();
+        let mut headers = HeaderMap::new();
+        headers.insert("x-amz-grant-full-control", HeaderValue::from_static("id=owner-123"));
+        headers.insert(
+            "x-amz-grant-read",
+            HeaderValue::from_static("uri=http://acs.amazonaws.com/groups/global/AllUsers"),
+        );
+
+        let conditions = get_condition_values(&headers, &cred, None, None, None);
+
+        assert_eq!(conditions.get("x-amz-grant-full-control"), Some(&vec!["id=owner-123".to_string()]));
+        assert_eq!(
+            conditions.get("x-amz-grant-read"),
+            Some(&vec!["uri=http://acs.amazonaws.com/groups/global/AllUsers".to_string()])
+        );
+    }
+
     #[test]
     fn test_get_condition_values_with_signature_age() {
         let cred = create_test_credentials();

rustfs/src/storage/access.rs

@@ -166,14 +166,20 @@ async fn load_object_acl(bucket: &str, object: &str, version_id: Option<&str>, h
 }
 
 async fn check_acl_access<T>(req: &S3Request<T>, req_info: &ReqInfo, action: &Action, policy_allowed: bool) -> S3Result<bool> {
-    if req_info.is_owner || policy_allowed {
-        return Ok(true);
-    }
-
     let Some((target, permission)) = acl_permission_for_action(action) else {
         return Ok(true);
     };
 
+    // For object-level operations, do not bypass on account-level is_owner.
+    // The bucket/account owner must have explicit ACL grant to access objects owned by others.
+    let bypass_owner = match target {
+        AclTarget::Bucket => req_info.is_owner,
+        AclTarget::Object => false,
+    };
+    if bypass_owner || policy_allowed {
+        return Ok(true);
+    }
+
     let bucket = req_info.bucket.as_deref().unwrap_or("");
     if bucket.is_empty() {
         return Ok(true);
@@ -364,7 +370,7 @@ pub async fn authorize_request<T>(req: &mut S3Request<T>, action: Action) -> S3R
             return Err(s3_error!(AccessDenied, "Access Denied"));
         }
 
-        if PolicySys::is_allowed(&BucketPolicyArgs {
+        let policy_allowed_fallback = PolicySys::is_allowed(&BucketPolicyArgs {
             bucket: req_info.bucket.as_deref().unwrap_or(""),
             action,
             is_owner: req_info.is_owner,
@@ -373,8 +379,16 @@ pub async fn authorize_request<T>(req: &mut S3Request<T>, action: Action) -> S3R
             conditions: &conditions,
             object: req_info.object.as_deref().unwrap_or(""),
         })
-        .await
+        .await;
-        {
+
+        if policy_allowed_fallback {
+            // For object-level operations, bucket owner (is_owner) must still pass ACL check.
+            // Policy may have allowed due to is_owner, but object owner is authoritative.
+            if let Some((AclTarget::Object, _)) = acl_permission_for_action(&action)
+                && !check_acl_access(req, req_info, &action, false).await?
+            {
+                return Err(s3_error!(AccessDenied, "Access Denied"));
+            }
             return Ok(());
         }
 

scripts/s3-tests/implemented_tests.txt

@@ -21,7 +21,7 @@
 # - Object ownership: Bucket ownership controls
 #
 # - SSE-KMS: KMS-related edge cases
-# - Bucket Policy: Multipart upload authorization, SSE condition keys
+# - Bucket Policy: Multipart upload authorization, SSE condition keys, grant header conditions
 # - Versioning: Concurrent multi-object delete
 # - ACL: Bucket and Object ACL
 # - Object Copy: Same/cross bucket, metadata, versioning
@@ -36,7 +36,7 @@
 # - DeleteObject: Proper NoSuchBucket for deleted buckets
 # - Multipart Copy: InvalidRange when CopySourceRange exceeds source size
 #
-# Total: 394 tests
+# Total: 395 tests
 
 test_basic_key_count
 test_bucket_create_naming_bad_short_one
@@ -227,6 +227,7 @@ test_bucket_policy_another_bucket
 test_bucket_policy_allow_notprincipal
 test_bucket_policy_multipart
 test_bucket_policy_put_obj_acl
+test_bucket_policy_put_obj_grant
 test_bucket_policy_put_obj_kms_s3
 test_bucket_policy_put_obj_s3_kms
 test_object_presigned_put_object_with_acl

scripts/s3-tests/unimplemented_tests.txt

@@ -28,5 +28,4 @@ test_lifecycle_transition_encrypted
 
 # Tests with known issues (need further investigation)
 test_bucket_policy_different_tenant
-test_bucket_policy_put_obj_grant
 test_bucket_policy_tenanted_bucket