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Chris LuandGitHub
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* s3: list the buckets an attached IAM policy grants ListBuckets served an identity authorized by an attached IAM policy only the buckets it had created itself. A user granted s3:ListBucket on a bucket someone else provisioned could GetObject and ListObjectsV2 against it, but the bucket never showed up in the listing any S3 client uses to build its bucket picker. The owner-index fast path is only valid for an identity whose grants name every bucket it can reach, and the routing check assumed a policy could never be enumerated. Read the names out of the policy instead: statements that allow s3:ListBucket on a concrete bucket ARN become candidates, and the per-bucket permission re-check still decides what is listed. A policy that can reach a bucket it does not name -- a wildcard resource, a policy variable, a NotResource, an STS session policy -- falls back to the full scan, which evaluates the policy per bucket. * s3: share the attached policy name lookup authorizeWithIAM and the ListBuckets enumeration both built an identity's policy names the same way, its own plus the ones from its enabled groups. Pull that into one helper so group eligibility is decided in a single place. * s3: read policy actions the way the IAM authorizer matches them The IAM authorizer matches action names case-insensitively, so a policy granting "S3:LISTBUCKET" or "S3:*" authorizes a list. The ListBuckets classifier read those actions with the local case-sensitive matcher and found no grant, so once the owner index was ready the buckets that policy allows dropped out of the listing. Match the action the looser way in the classifier: case-insensitive, and true for any pattern holding a policy variable. Over-matching only costs a candidate the per-bucket permission check then rejects, while under-matching hides a bucket the caller can read. * s3: infer a multipart grant in any case The classifier matches action patterns case-insensitively but looked the requested action up in a canonical-cased set, so "S3:UPLOADPART" missed the s3:PutObject inference that the authorizer makes. Key the set for lookup in lower case, matching how the IAM authorizer holds it.